// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
 */

#include <linux/completion.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/rbtree.h>
#include <linux/igmp.h>
#include <linux/xarray.h>
#include <linux/inetdevice.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/route.h>

#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/netevent.h>
#include <net/tcp.h>
#include <net/ipv6.h>
#include <net/ip_fib.h>
#include <net/ip6_route.h>

#include <rdma/rdma_cm.h>
#include <rdma/rdma_cm_ib.h>
#include <rdma/rdma_netlink.h>
#include <rdma/ib.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_sa.h>
#include <rdma/iw_cm.h>

#include "core_priv.h"
#include "cma_priv.h"
#include "cma_trace.h"

MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("Generic RDMA CM Agent");
MODULE_LICENSE("Dual BSD/GPL");

#define CMA_CM_RESPONSE_TIMEOUT 20
#define CMA_MAX_CM_RETRIES 15
#define CMA_IBOE_PACKET_LIFETIME 16
#define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP

static const char * const cma_events[] = {
        [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
        [RDMA_CM_EVENT_ADDR_ERROR]       = "address error",
        [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
        [RDMA_CM_EVENT_ROUTE_ERROR]      = "route error",
        [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
        [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
        [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
        [RDMA_CM_EVENT_UNREACHABLE]      = "unreachable",
        [RDMA_CM_EVENT_REJECTED]         = "rejected",
        [RDMA_CM_EVENT_ESTABLISHED]      = "established",
        [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
        [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
        [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
        [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
        [RDMA_CM_EVENT_ADDR_CHANGE]      = "address change",
        [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
};

static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
                              enum ib_gid_type gid_type);

static void cma_netevent_work_handler(struct work_struct *_work);

const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
{
        size_t index = event;

        return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
                        cma_events[index] : "unrecognized event";
}
EXPORT_SYMBOL(rdma_event_msg);

const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
                                                int reason)
{
        if (rdma_ib_or_roce(id->device, id->port_num))
                return ibcm_reject_msg(reason);

        if (rdma_protocol_iwarp(id->device, id->port_num))
                return iwcm_reject_msg(reason);

        WARN_ON_ONCE(1);
        return "unrecognized transport";
}
EXPORT_SYMBOL(rdma_reject_msg);

/**
 * rdma_is_consumer_reject - return true if the consumer rejected the connect
 *                           request.
 * @id: Communication identifier that received the REJECT event.
 * @reason: Value returned in the REJECT event status field.
 */
static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
{
        if (rdma_ib_or_roce(id->device, id->port_num))
                return reason == IB_CM_REJ_CONSUMER_DEFINED;

        if (rdma_protocol_iwarp(id->device, id->port_num))
                return reason == -ECONNREFUSED;

        WARN_ON_ONCE(1);
        return false;
}

const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
                                      struct rdma_cm_event *ev, u8 *data_len)
{
        const void *p;

        if (rdma_is_consumer_reject(id, ev->status)) {
                *data_len = ev->param.conn.private_data_len;
                p = ev->param.conn.private_data;
        } else {
                *data_len = 0;
                p = NULL;
        }
        return p;
}
EXPORT_SYMBOL(rdma_consumer_reject_data);

/**
 * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
 * @id: Communication Identifier
 */
struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (id->device->node_type == RDMA_NODE_RNIC)
                return id_priv->cm_id.iw;
        return NULL;
}
EXPORT_SYMBOL(rdma_iw_cm_id);

static int cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device, void *client_data);

static struct ib_client cma_client = {
        .name   = "cma",
        .add    = cma_add_one,
        .remove = cma_remove_one
};

static struct ib_sa_client sa_client;
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
static struct rb_root id_table = RB_ROOT;
/* Serialize operations of id_table tree */
static DEFINE_SPINLOCK(id_table_lock);
static struct workqueue_struct *cma_wq;
static unsigned int cma_pernet_id;

struct cma_pernet {
        struct xarray tcp_ps;
        struct xarray udp_ps;
        struct xarray ipoib_ps;
        struct xarray ib_ps;
};

static struct cma_pernet *cma_pernet(struct net *net)
{
        return net_generic(net, cma_pernet_id);
}

static
struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
{
        struct cma_pernet *pernet = cma_pernet(net);

        switch (ps) {
        case RDMA_PS_TCP:
                return &pernet->tcp_ps;
        case RDMA_PS_UDP:
                return &pernet->udp_ps;
        case RDMA_PS_IPOIB:
                return &pernet->ipoib_ps;
        case RDMA_PS_IB:
                return &pernet->ib_ps;
        default:
                return NULL;
        }
}

struct id_table_entry {
        struct list_head id_list;
        struct rb_node rb_node;
};

struct cma_device {
        struct list_head        list;
        struct ib_device        *device;
        struct completion       comp;
        refcount_t refcount;
        struct list_head        id_list;
        enum ib_gid_type        *default_gid_type;
        u8                      *default_roce_tos;
};

struct rdma_bind_list {
        enum rdma_ucm_port_space ps;
        struct hlist_head       owners;
        unsigned short          port;
};

static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
                        struct rdma_bind_list *bind_list, int snum)
{
        struct xarray *xa = cma_pernet_xa(net, ps);

        return xa_insert(xa, snum, bind_list, GFP_KERNEL);
}

static struct rdma_bind_list *cma_ps_find(struct net *net,
                                          enum rdma_ucm_port_space ps, int snum)
{
        struct xarray *xa = cma_pernet_xa(net, ps);

        return xa_load(xa, snum);
}

static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
                          int snum)
{
        struct xarray *xa = cma_pernet_xa(net, ps);

        xa_erase(xa, snum);
}

enum {
        CMA_OPTION_AFONLY,
};

void cma_dev_get(struct cma_device *cma_dev)
{
        refcount_inc(&cma_dev->refcount);
}

void cma_dev_put(struct cma_device *cma_dev)
{
        if (refcount_dec_and_test(&cma_dev->refcount))
                complete(&cma_dev->comp);
}

struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
                                             void               *cookie)
{
        struct cma_device *cma_dev;
        struct cma_device *found_cma_dev = NULL;

        mutex_lock(&lock);

        list_for_each_entry(cma_dev, &dev_list, list)
                if (filter(cma_dev->device, cookie)) {
                        found_cma_dev = cma_dev;
                        break;
                }

        if (found_cma_dev)
                cma_dev_get(found_cma_dev);
        mutex_unlock(&lock);
        return found_cma_dev;
}

int cma_get_default_gid_type(struct cma_device *cma_dev,
                             u32 port)
{
        if (!rdma_is_port_valid(cma_dev->device, port))
                return -EINVAL;

        return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
}

int cma_set_default_gid_type(struct cma_device *cma_dev,
                             u32 port,
                             enum ib_gid_type default_gid_type)
{
        unsigned long supported_gids;

        if (!rdma_is_port_valid(cma_dev->device, port))
                return -EINVAL;

        if (default_gid_type == IB_GID_TYPE_IB &&
            rdma_protocol_roce_eth_encap(cma_dev->device, port))
                default_gid_type = IB_GID_TYPE_ROCE;

        supported_gids = roce_gid_type_mask_support(cma_dev->device, port);

        if (!(supported_gids & 1 << default_gid_type))
                return -EINVAL;

        cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
                default_gid_type;

        return 0;
}

int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
{
        if (!rdma_is_port_valid(cma_dev->device, port))
                return -EINVAL;

        return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
}

int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
                             u8 default_roce_tos)
{
        if (!rdma_is_port_valid(cma_dev->device, port))
                return -EINVAL;

        cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
                 default_roce_tos;

        return 0;
}
struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
{
        return cma_dev->device;
}

/*
 * Device removal can occur at anytime, so we need extra handling to
 * serialize notifying the user of device removal with other callbacks.
 * We do this by disabling removal notification while a callback is in process,
 * and reporting it after the callback completes.
 */

struct cma_multicast {
        struct rdma_id_private *id_priv;
        union {
                struct ib_sa_multicast *sa_mc;
                struct {
                        struct work_struct work;
                        struct rdma_cm_event event;
                } iboe_join;
        };
        struct list_head        list;
        void                    *context;
        struct sockaddr_storage addr;
        u8                      join_state;
};

struct cma_work {
        struct work_struct      work;
        struct rdma_id_private  *id;
        enum rdma_cm_state      old_state;
        enum rdma_cm_state      new_state;
        struct rdma_cm_event    event;
};

union cma_ip_addr {
        struct in6_addr ip6;
        struct {
                __be32 pad[3];
                __be32 addr;
        } ip4;
};

struct cma_hdr {
        u8 cma_version;
        u8 ip_version;  /* IP version: 7:4 */
        __be16 port;
        union cma_ip_addr src_addr;
        union cma_ip_addr dst_addr;
};

#define CMA_VERSION 0x00

struct cma_req_info {
        struct sockaddr_storage listen_addr_storage;
        struct sockaddr_storage src_addr_storage;
        struct ib_device *device;
        union ib_gid local_gid;
        __be64 service_id;
        int port;
        bool has_gid;
        u16 pkey;
};

static int cma_comp_exch(struct rdma_id_private *id_priv,
                         enum rdma_cm_state comp, enum rdma_cm_state exch)
{
        unsigned long flags;
        int ret;

        /*
         * The FSM uses a funny double locking where state is protected by both
         * the handler_mutex and the spinlock. State is not allowed to change
         * to/from a handler_mutex protected value without also holding
         * handler_mutex.
         */
        if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
                lockdep_assert_held(&id_priv->handler_mutex);

        spin_lock_irqsave(&id_priv->lock, flags);
        if ((ret = (id_priv->state == comp)))
                id_priv->state = exch;
        spin_unlock_irqrestore(&id_priv->lock, flags);
        return ret;
}

static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
{
        return hdr->ip_version >> 4;
}

static void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
{
        hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
}

static struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
{
        return (struct sockaddr *)&id_priv->id.route.addr.src_addr;
}

static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
{
        return (struct sockaddr *)&id_priv->id.route.addr.dst_addr;
}

static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
{
        struct in_device *in_dev = NULL;

        if (ndev) {
                rtnl_lock();
                in_dev = __in_dev_get_rtnl(ndev);
                if (in_dev) {
                        if (join)
                                ip_mc_inc_group(in_dev,
                                                *(__be32 *)(mgid->raw + 12));
                        else
                                ip_mc_dec_group(in_dev,
                                                *(__be32 *)(mgid->raw + 12));
                }
                rtnl_unlock();
        }
        return (in_dev) ? 0 : -ENODEV;
}

static int compare_netdev_and_ip(int ifindex_a, struct sockaddr *sa,
                                 struct id_table_entry *entry_b)
{
        struct rdma_id_private *id_priv = list_first_entry(
                &entry_b->id_list, struct rdma_id_private, id_list_entry);
        int ifindex_b = id_priv->id.route.addr.dev_addr.bound_dev_if;
        struct sockaddr *sb = cma_dst_addr(id_priv);

        if (ifindex_a != ifindex_b)
                return (ifindex_a > ifindex_b) ? 1 : -1;

        if (sa->sa_family != sb->sa_family)
                return sa->sa_family - sb->sa_family;

        if (sa->sa_family == AF_INET &&
            __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in)) {
                return memcmp(&((struct sockaddr_in *)sa)->sin_addr,
                              &((struct sockaddr_in *)sb)->sin_addr,
                              sizeof(((struct sockaddr_in *)sa)->sin_addr));
        }

        if (sa->sa_family == AF_INET6 &&
            __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in6)) {
                return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
                                     &((struct sockaddr_in6 *)sb)->sin6_addr);
        }

        return -1;
}

static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv)
{
        struct rb_node **new, *parent = NULL;
        struct id_table_entry *this, *node;
        unsigned long flags;
        int result;

        node = kzalloc_obj(*node);
        if (!node)
                return -ENOMEM;

        spin_lock_irqsave(&id_table_lock, flags);
        new = &id_table.rb_node;
        while (*new) {
                this = container_of(*new, struct id_table_entry, rb_node);
                result = compare_netdev_and_ip(
                        node_id_priv->id.route.addr.dev_addr.bound_dev_if,
                        cma_dst_addr(node_id_priv), this);

                parent = *new;
                if (result < 0)
                        new = &((*new)->rb_left);
                else if (result > 0)
                        new = &((*new)->rb_right);
                else {
                        list_add_tail(&node_id_priv->id_list_entry,
                                      &this->id_list);
                        kfree(node);
                        goto unlock;
                }
        }

        INIT_LIST_HEAD(&node->id_list);
        list_add_tail(&node_id_priv->id_list_entry, &node->id_list);

        rb_link_node(&node->rb_node, parent, new);
        rb_insert_color(&node->rb_node, &id_table);

unlock:
        spin_unlock_irqrestore(&id_table_lock, flags);
        return 0;
}

static struct id_table_entry *
node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa)
{
        struct rb_node *node = root->rb_node;
        struct id_table_entry *data;
        int result;

        while (node) {
                data = container_of(node, struct id_table_entry, rb_node);
                result = compare_netdev_and_ip(ifindex, sa, data);
                if (result < 0)
                        node = node->rb_left;
                else if (result > 0)
                        node = node->rb_right;
                else
                        return data;
        }

        return NULL;
}

static void cma_remove_id_from_tree(struct rdma_id_private *id_priv)
{
        struct id_table_entry *data;
        unsigned long flags;

        spin_lock_irqsave(&id_table_lock, flags);
        if (list_empty(&id_priv->id_list_entry))
                goto out;

        data = node_from_ndev_ip(&id_table,
                                 id_priv->id.route.addr.dev_addr.bound_dev_if,
                                 cma_dst_addr(id_priv));
        if (!data)
                goto out;

        list_del_init(&id_priv->id_list_entry);
        if (list_empty(&data->id_list)) {
                rb_erase(&data->rb_node, &id_table);
                kfree(data);
        }
out:
        spin_unlock_irqrestore(&id_table_lock, flags);
}

static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
                               struct cma_device *cma_dev)
{
        cma_dev_get(cma_dev);
        id_priv->cma_dev = cma_dev;
        id_priv->id.device = cma_dev->device;
        id_priv->id.route.addr.dev_addr.transport =
                rdma_node_get_transport(cma_dev->device->node_type);
        list_add_tail(&id_priv->device_item, &cma_dev->id_list);

        trace_cm_id_attach(id_priv, cma_dev->device);
}

static void cma_attach_to_dev(struct rdma_id_private *id_priv,
                              struct cma_device *cma_dev)
{
        _cma_attach_to_dev(id_priv, cma_dev);
        id_priv->gid_type =
                cma_dev->default_gid_type[id_priv->id.port_num -
                                          rdma_start_port(cma_dev->device)];
}

static void cma_release_dev(struct rdma_id_private *id_priv)
{
        mutex_lock(&lock);
        list_del_init(&id_priv->device_item);
        cma_dev_put(id_priv->cma_dev);
        id_priv->cma_dev = NULL;
        id_priv->id.device = NULL;
        if (id_priv->id.route.addr.dev_addr.sgid_attr) {
                rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
                id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
        }
        mutex_unlock(&lock);
}

static inline unsigned short cma_family(struct rdma_id_private *id_priv)
{
        return id_priv->id.route.addr.src_addr.ss_family;
}

static int cma_set_default_qkey(struct rdma_id_private *id_priv)
{
        struct ib_sa_mcmember_rec rec;
        int ret = 0;

        switch (id_priv->id.ps) {
        case RDMA_PS_UDP:
        case RDMA_PS_IB:
                id_priv->qkey = RDMA_UDP_QKEY;
                break;
        case RDMA_PS_IPOIB:
                ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
                ret = ib_sa_get_mcmember_rec(id_priv->id.device,
                                             id_priv->id.port_num, &rec.mgid,
                                             &rec);
                if (!ret)
                        id_priv->qkey = be32_to_cpu(rec.qkey);
                break;
        default:
                break;
        }
        return ret;
}

static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
{
        if (!qkey ||
            (id_priv->qkey && (id_priv->qkey != qkey)))
                return -EINVAL;

        id_priv->qkey = qkey;
        return 0;
}

static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
{
        dev_addr->dev_type = ARPHRD_INFINIBAND;
        rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
        ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
}

static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
{
        int ret;

        if (addr->sa_family != AF_IB) {
                ret = rdma_translate_ip(addr, dev_addr);
        } else {
                cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
                ret = 0;
        }

        return ret;
}

static const struct ib_gid_attr *
cma_validate_port(struct ib_device *device, u32 port,
                  enum ib_gid_type gid_type,
                  union ib_gid *gid,
                  struct rdma_id_private *id_priv)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        const struct ib_gid_attr *sgid_attr = ERR_PTR(-ENODEV);
        int bound_if_index = dev_addr->bound_dev_if;
        int dev_type = dev_addr->dev_type;
        struct net_device *ndev = NULL;
        struct net_device *pdev = NULL;

        if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
                goto out;

        if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
                goto out;

        if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
                goto out;

        /*
         * For drivers that do not associate more than one net device with
         * their gid tables, such as iWARP drivers, it is sufficient to
         * return the first table entry.
         *
         * Other driver classes might be included in the future.
         */
        if (rdma_protocol_iwarp(device, port)) {
                sgid_attr = rdma_get_gid_attr(device, port, 0);
                if (IS_ERR(sgid_attr))
                        goto out;

                rcu_read_lock();
                ndev = rcu_dereference(sgid_attr->ndev);
                if (ndev->ifindex != bound_if_index) {
                        pdev = dev_get_by_index_rcu(dev_addr->net, bound_if_index);
                        if (pdev) {
                                if (is_vlan_dev(pdev)) {
                                        pdev = vlan_dev_real_dev(pdev);
                                        if (ndev->ifindex == pdev->ifindex)
                                                bound_if_index = pdev->ifindex;
                                }
                                if (is_vlan_dev(ndev)) {
                                        pdev = vlan_dev_real_dev(ndev);
                                        if (bound_if_index == pdev->ifindex)
                                                bound_if_index = ndev->ifindex;
                                }
                        }
                }
                if (!net_eq(dev_net(ndev), dev_addr->net) ||
                    ndev->ifindex != bound_if_index) {
                        rdma_put_gid_attr(sgid_attr);
                        sgid_attr = ERR_PTR(-ENODEV);
                }
                rcu_read_unlock();
                goto out;
        }

        /*
         * For a RXE device, it should work with TUN device and normal ethernet
         * devices. Use driver_id to check if a device is a RXE device or not.
         * ARPHDR_NONE means a TUN device.
         */
        if (device->ops.driver_id == RDMA_DRIVER_RXE) {
                if ((dev_type == ARPHRD_NONE || dev_type == ARPHRD_ETHER)
                        && rdma_protocol_roce(device, port)) {
                        ndev = dev_get_by_index(dev_addr->net, bound_if_index);
                        if (!ndev)
                                goto out;
                }
        } else {
                if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
                        ndev = dev_get_by_index(dev_addr->net, bound_if_index);
                        if (!ndev)
                                goto out;
                } else {
                        gid_type = IB_GID_TYPE_IB;
                }
        }

        sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
        dev_put(ndev);
out:
        return sgid_attr;
}

static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
                               const struct ib_gid_attr *sgid_attr)
{
        WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
        id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
}

/**
 * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
 * based on source ip address.
 * @id_priv:    cm_id which should be bound to cma device
 *
 * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
 * based on source IP address. It returns 0 on success or error code otherwise.
 * It is applicable to active and passive side cm_id.
 */
static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        const struct ib_gid_attr *sgid_attr;
        union ib_gid gid, iboe_gid, *gidp;
        struct cma_device *cma_dev;
        enum ib_gid_type gid_type;
        int ret = -ENODEV;
        u32 port;

        if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
            id_priv->id.ps == RDMA_PS_IPOIB)
                return -EINVAL;

        rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                    &iboe_gid);

        memcpy(&gid, dev_addr->src_dev_addr +
               rdma_addr_gid_offset(dev_addr), sizeof(gid));

        mutex_lock(&lock);
        list_for_each_entry(cma_dev, &dev_list, list) {
                if (id_priv->restricted_node_type != RDMA_NODE_UNSPECIFIED &&
                    id_priv->restricted_node_type != cma_dev->device->node_type)
                        continue;
                rdma_for_each_port (cma_dev->device, port) {
                        gidp = rdma_protocol_roce(cma_dev->device, port) ?
                               &iboe_gid : &gid;
                        gid_type = cma_dev->default_gid_type[port - 1];
                        sgid_attr = cma_validate_port(cma_dev->device, port,
                                                      gid_type, gidp, id_priv);
                        if (!IS_ERR(sgid_attr)) {
                                id_priv->id.port_num = port;
                                cma_bind_sgid_attr(id_priv, sgid_attr);
                                cma_attach_to_dev(id_priv, cma_dev);
                                ret = 0;
                                goto out;
                        }
                }
        }
out:
        mutex_unlock(&lock);
        return ret;
}

/**
 * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
 * @id_priv:            cm id to bind to cma device
 * @listen_id_priv:     listener cm id to match against
 * @req:                Pointer to req structure containaining incoming
 *                      request information
 * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
 * rdma device matches for listen_id and incoming request. It also verifies
 * that a GID table entry is present for the source address.
 * Returns 0 on success, or returns error code otherwise.
 */
static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
                              const struct rdma_id_private *listen_id_priv,
                              struct cma_req_info *req)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        const struct ib_gid_attr *sgid_attr;
        enum ib_gid_type gid_type;
        union ib_gid gid;

        if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
            id_priv->id.ps == RDMA_PS_IPOIB)
                return -EINVAL;

        if (rdma_protocol_roce(req->device, req->port))
                rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                            &gid);
        else
                memcpy(&gid, dev_addr->src_dev_addr +
                       rdma_addr_gid_offset(dev_addr), sizeof(gid));

        gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
        sgid_attr = cma_validate_port(req->device, req->port,
                                      gid_type, &gid, id_priv);
        if (IS_ERR(sgid_attr))
                return PTR_ERR(sgid_attr);

        id_priv->id.port_num = req->port;
        cma_bind_sgid_attr(id_priv, sgid_attr);
        /* Need to acquire lock to protect against reader
         * of cma_dev->id_list such as cma_netdev_callback() and
         * cma_process_remove().
         */
        mutex_lock(&lock);
        cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
        mutex_unlock(&lock);
        rdma_restrack_add(&id_priv->res);
        return 0;
}

static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
                              const struct rdma_id_private *listen_id_priv)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        const struct ib_gid_attr *sgid_attr;
        struct cma_device *cma_dev;
        enum ib_gid_type gid_type;
        int ret = -ENODEV;
        union ib_gid gid;
        u32 port;

        if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
            id_priv->id.ps == RDMA_PS_IPOIB)
                return -EINVAL;

        memcpy(&gid, dev_addr->src_dev_addr +
               rdma_addr_gid_offset(dev_addr), sizeof(gid));

        mutex_lock(&lock);

        cma_dev = listen_id_priv->cma_dev;
        port = listen_id_priv->id.port_num;
        gid_type = listen_id_priv->gid_type;
        sgid_attr = cma_validate_port(cma_dev->device, port,
                                      gid_type, &gid, id_priv);
        if (!IS_ERR(sgid_attr)) {
                id_priv->id.port_num = port;
                cma_bind_sgid_attr(id_priv, sgid_attr);
                ret = 0;
                goto out;
        }

        list_for_each_entry(cma_dev, &dev_list, list) {
                rdma_for_each_port (cma_dev->device, port) {
                        if (listen_id_priv->cma_dev == cma_dev &&
                            listen_id_priv->id.port_num == port)
                                continue;

                        gid_type = cma_dev->default_gid_type[port - 1];
                        sgid_attr = cma_validate_port(cma_dev->device, port,
                                                      gid_type, &gid, id_priv);
                        if (!IS_ERR(sgid_attr)) {
                                id_priv->id.port_num = port;
                                cma_bind_sgid_attr(id_priv, sgid_attr);
                                ret = 0;
                                goto out;
                        }
                }
        }

out:
        if (!ret) {
                cma_attach_to_dev(id_priv, cma_dev);
                rdma_restrack_add(&id_priv->res);
        }

        mutex_unlock(&lock);
        return ret;
}

/*
 * Select the source IB device and address to reach the destination IB address.
 */
static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
{
        struct cma_device *cma_dev, *cur_dev;
        struct sockaddr_ib *addr;
        union ib_gid gid, sgid, *dgid;
        unsigned int p;
        u16 pkey, index;
        enum ib_port_state port_state;
        int ret;
        int i;

        cma_dev = NULL;
        addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
        dgid = (union ib_gid *) &addr->sib_addr;
        pkey = ntohs(addr->sib_pkey);

        mutex_lock(&lock);
        list_for_each_entry(cur_dev, &dev_list, list) {
                rdma_for_each_port (cur_dev->device, p) {
                        if (!rdma_cap_af_ib(cur_dev->device, p))
                                continue;

                        if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
                                continue;

                        if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
                                continue;

                        for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
                             ++i) {
                                ret = rdma_query_gid(cur_dev->device, p, i,
                                                     &gid);
                                if (ret)
                                        continue;

                                if (!memcmp(&gid, dgid, sizeof(gid))) {
                                        cma_dev = cur_dev;
                                        sgid = gid;
                                        id_priv->id.port_num = p;
                                        goto found;
                                }

                                if (!cma_dev && (gid.global.subnet_prefix ==
                                    dgid->global.subnet_prefix) &&
                                    port_state == IB_PORT_ACTIVE) {
                                        cma_dev = cur_dev;
                                        sgid = gid;
                                        id_priv->id.port_num = p;
                                        goto found;
                                }
                        }
                }
        }
        mutex_unlock(&lock);
        return -ENODEV;

found:
        cma_attach_to_dev(id_priv, cma_dev);
        rdma_restrack_add(&id_priv->res);
        mutex_unlock(&lock);
        addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
        memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
        cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
        return 0;
}

static void cma_id_get(struct rdma_id_private *id_priv)
{
        refcount_inc(&id_priv->refcount);
}

static void cma_id_put(struct rdma_id_private *id_priv)
{
        if (refcount_dec_and_test(&id_priv->refcount))
                complete(&id_priv->comp);
}

static struct rdma_id_private *
__rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
                 void *context, enum rdma_ucm_port_space ps,
                 enum ib_qp_type qp_type, const struct rdma_id_private *parent)
{
        struct rdma_id_private *id_priv;

        id_priv = kzalloc_obj(*id_priv);
        if (!id_priv)
                return ERR_PTR(-ENOMEM);

        id_priv->state = RDMA_CM_IDLE;
        id_priv->restricted_node_type = RDMA_NODE_UNSPECIFIED;
        id_priv->id.context = context;
        id_priv->id.event_handler = event_handler;
        id_priv->id.ps = ps;
        id_priv->id.qp_type = qp_type;
        id_priv->tos_set = false;
        id_priv->timeout_set = false;
        id_priv->min_rnr_timer_set = false;
        id_priv->gid_type = IB_GID_TYPE_IB;
        spin_lock_init(&id_priv->lock);
        mutex_init(&id_priv->qp_mutex);
        init_completion(&id_priv->comp);
        refcount_set(&id_priv->refcount, 1);
        mutex_init(&id_priv->handler_mutex);
        INIT_LIST_HEAD(&id_priv->device_item);
        INIT_LIST_HEAD(&id_priv->id_list_entry);
        INIT_LIST_HEAD(&id_priv->listen_list);
        INIT_LIST_HEAD(&id_priv->mc_list);
        get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
        id_priv->id.route.addr.dev_addr.net = get_net(net);
        id_priv->seq_num &= 0x00ffffff;
        INIT_WORK(&id_priv->id.net_work, cma_netevent_work_handler);

        rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
        if (parent)
                rdma_restrack_parent_name(&id_priv->res, &parent->res);

        return id_priv;
}

struct rdma_cm_id *
__rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
                        void *context, enum rdma_ucm_port_space ps,
                        enum ib_qp_type qp_type, const char *caller)
{
        struct rdma_id_private *ret;

        ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
        if (IS_ERR(ret))
                return ERR_CAST(ret);

        rdma_restrack_set_name(&ret->res, caller);
        return &ret->id;
}
EXPORT_SYMBOL(__rdma_create_kernel_id);

struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
                                       void *context,
                                       enum rdma_ucm_port_space ps,
                                       enum ib_qp_type qp_type)
{
        struct rdma_id_private *ret;

        ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
                               ps, qp_type, NULL);
        if (IS_ERR(ret))
                return ERR_CAST(ret);

        rdma_restrack_set_name(&ret->res, NULL);
        return &ret->id;
}
EXPORT_SYMBOL(rdma_create_user_id);

static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
        struct ib_qp_attr qp_attr;
        int qp_attr_mask, ret;

        qp_attr.qp_state = IB_QPS_INIT;
        ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
        if (ret)
                return ret;

        ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
        if (ret)
                return ret;

        qp_attr.qp_state = IB_QPS_RTR;
        ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
        if (ret)
                return ret;

        qp_attr.qp_state = IB_QPS_RTS;
        qp_attr.sq_psn = 0;
        ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);

        return ret;
}

static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
        struct ib_qp_attr qp_attr;
        int qp_attr_mask, ret;

        qp_attr.qp_state = IB_QPS_INIT;
        ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
        if (ret)
                return ret;

        return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
}

int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
                   struct ib_qp_init_attr *qp_init_attr)
{
        struct rdma_id_private *id_priv;
        struct ib_qp *qp;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (id->device != pd->device) {
                ret = -EINVAL;
                goto out_err;
        }

        qp_init_attr->port_num = id->port_num;
        qp = ib_create_qp(pd, qp_init_attr);
        if (IS_ERR(qp)) {
                ret = PTR_ERR(qp);
                goto out_err;
        }

        if (id->qp_type == IB_QPT_UD)
                ret = cma_init_ud_qp(id_priv, qp);
        else
                ret = cma_init_conn_qp(id_priv, qp);
        if (ret)
                goto out_destroy;

        id->qp = qp;
        id_priv->qp_num = qp->qp_num;
        id_priv->srq = (qp->srq != NULL);
        trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
        return 0;
out_destroy:
        ib_destroy_qp(qp);
out_err:
        trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
        return ret;
}
EXPORT_SYMBOL(rdma_create_qp);

void rdma_destroy_qp(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv;

        id_priv = container_of(id, struct rdma_id_private, id);
        trace_cm_qp_destroy(id_priv);
        mutex_lock(&id_priv->qp_mutex);
        ib_destroy_qp(id_priv->id.qp);
        id_priv->id.qp = NULL;
        mutex_unlock(&id_priv->qp_mutex);
}
EXPORT_SYMBOL(rdma_destroy_qp);

static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
                             struct rdma_conn_param *conn_param)
{
        struct ib_qp_attr qp_attr;
        int qp_attr_mask, ret;

        mutex_lock(&id_priv->qp_mutex);
        if (!id_priv->id.qp) {
                ret = 0;
                goto out;
        }

        /* Need to update QP attributes from default values. */
        qp_attr.qp_state = IB_QPS_INIT;
        ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
        if (ret)
                goto out;

        ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
        if (ret)
                goto out;

        qp_attr.qp_state = IB_QPS_RTR;
        ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
        if (ret)
                goto out;

        BUG_ON(id_priv->cma_dev->device != id_priv->id.device);

        if (conn_param)
                qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
        ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
out:
        mutex_unlock(&id_priv->qp_mutex);
        return ret;
}

static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
                             struct rdma_conn_param *conn_param)
{
        struct ib_qp_attr qp_attr;
        int qp_attr_mask, ret;

        mutex_lock(&id_priv->qp_mutex);
        if (!id_priv->id.qp) {
                ret = 0;
                goto out;
        }

        qp_attr.qp_state = IB_QPS_RTS;
        ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
        if (ret)
                goto out;

        if (conn_param)
                qp_attr.max_rd_atomic = conn_param->initiator_depth;
        ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
out:
        mutex_unlock(&id_priv->qp_mutex);
        return ret;
}

static int cma_modify_qp_err(struct rdma_id_private *id_priv)
{
        struct ib_qp_attr qp_attr;
        int ret;

        mutex_lock(&id_priv->qp_mutex);
        if (!id_priv->id.qp) {
                ret = 0;
                goto out;
        }

        qp_attr.qp_state = IB_QPS_ERR;
        ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
out:
        mutex_unlock(&id_priv->qp_mutex);
        return ret;
}

static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
                               struct ib_qp_attr *qp_attr, int *qp_attr_mask)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        int ret;
        u16 pkey;

        if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
                pkey = 0xffff;
        else
                pkey = ib_addr_get_pkey(dev_addr);

        ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
                                  pkey, &qp_attr->pkey_index);
        if (ret)
                return ret;

        qp_attr->port_num = id_priv->id.port_num;
        *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;

        if (id_priv->id.qp_type == IB_QPT_UD) {
                ret = cma_set_default_qkey(id_priv);
                if (ret)
                        return ret;

                qp_attr->qkey = id_priv->qkey;
                *qp_attr_mask |= IB_QP_QKEY;
        } else {
                qp_attr->qp_access_flags = 0;
                *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
        }
        return 0;
}

int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
                       int *qp_attr_mask)
{
        struct rdma_id_private *id_priv;
        int ret = 0;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (rdma_cap_ib_cm(id->device, id->port_num)) {
                if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
                        ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
                else
                        ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
                                                 qp_attr_mask);

                if (qp_attr->qp_state == IB_QPS_RTR)
                        qp_attr->rq_psn = id_priv->seq_num;
        } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
                if (!id_priv->cm_id.iw) {
                        qp_attr->qp_access_flags = 0;
                        *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
                } else
                        ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
                                                 qp_attr_mask);
                qp_attr->port_num = id_priv->id.port_num;
                *qp_attr_mask |= IB_QP_PORT;
        } else {
                ret = -ENOSYS;
        }

        if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
                qp_attr->timeout = id_priv->timeout;

        if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
                qp_attr->min_rnr_timer = id_priv->min_rnr_timer;

        return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);

static inline bool cma_zero_addr(const struct sockaddr *addr)
{
        switch (addr->sa_family) {
        case AF_INET:
                return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
        case AF_INET6:
                return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
        case AF_IB:
                return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
        default:
                return false;
        }
}

static inline bool cma_loopback_addr(const struct sockaddr *addr)
{
        switch (addr->sa_family) {
        case AF_INET:
                return ipv4_is_loopback(
                        ((struct sockaddr_in *)addr)->sin_addr.s_addr);
        case AF_INET6:
                return ipv6_addr_loopback(
                        &((struct sockaddr_in6 *)addr)->sin6_addr);
        case AF_IB:
                return ib_addr_loopback(
                        &((struct sockaddr_ib *)addr)->sib_addr);
        default:
                return false;
        }
}

static inline bool cma_any_addr(const struct sockaddr *addr)
{
        return cma_zero_addr(addr) || cma_loopback_addr(addr);
}

static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
{
        if (src->sa_family != dst->sa_family)
                return -1;

        switch (src->sa_family) {
        case AF_INET:
                return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
                       ((struct sockaddr_in *)dst)->sin_addr.s_addr;
        case AF_INET6: {
                struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
                struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
                bool link_local;

                if (ipv6_addr_cmp(&src_addr6->sin6_addr,
                                          &dst_addr6->sin6_addr))
                        return 1;
                link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
                             IPV6_ADDR_LINKLOCAL;
                /* Link local must match their scope_ids */
                return link_local ? (src_addr6->sin6_scope_id !=
                                     dst_addr6->sin6_scope_id) :
                                    0;
        }

        default:
                return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
                                   &((struct sockaddr_ib *) dst)->sib_addr);
        }
}

static __be16 cma_port(const struct sockaddr *addr)
{
        struct sockaddr_ib *sib;

        switch (addr->sa_family) {
        case AF_INET:
                return ((struct sockaddr_in *) addr)->sin_port;
        case AF_INET6:
                return ((struct sockaddr_in6 *) addr)->sin6_port;
        case AF_IB:
                sib = (struct sockaddr_ib *) addr;
                return htons((u16) (be64_to_cpu(sib->sib_sid) &
                                    be64_to_cpu(sib->sib_sid_mask)));
        default:
                return 0;
        }
}

static inline int cma_any_port(const struct sockaddr *addr)
{
        return !cma_port(addr);
}

static void cma_save_ib_info(struct sockaddr *src_addr,
                             struct sockaddr *dst_addr,
                             const struct rdma_cm_id *listen_id,
                             const struct sa_path_rec *path)
{
        struct sockaddr_ib *listen_ib, *ib;

        listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
        if (src_addr) {
                ib = (struct sockaddr_ib *)src_addr;
                ib->sib_family = AF_IB;
                if (path) {
                        ib->sib_pkey = path->pkey;
                        ib->sib_flowinfo = path->flow_label;
                        memcpy(&ib->sib_addr, &path->sgid, 16);
                        ib->sib_sid = path->service_id;
                        ib->sib_scope_id = 0;
                } else {
                        ib->sib_pkey = listen_ib->sib_pkey;
                        ib->sib_flowinfo = listen_ib->sib_flowinfo;
                        ib->sib_addr = listen_ib->sib_addr;
                        ib->sib_sid = listen_ib->sib_sid;
                        ib->sib_scope_id = listen_ib->sib_scope_id;
                }
                ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
        }
        if (dst_addr) {
                ib = (struct sockaddr_ib *)dst_addr;
                ib->sib_family = AF_IB;
                if (path) {
                        ib->sib_pkey = path->pkey;
                        ib->sib_flowinfo = path->flow_label;
                        memcpy(&ib->sib_addr, &path->dgid, 16);
                }
        }
}

static void cma_save_ip4_info(struct sockaddr_in *src_addr,
                              struct sockaddr_in *dst_addr,
                              struct cma_hdr *hdr,
                              __be16 local_port)
{
        if (src_addr) {
                *src_addr = (struct sockaddr_in) {
                        .sin_family = AF_INET,
                        .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
                        .sin_port = local_port,
                };
        }

        if (dst_addr) {
                *dst_addr = (struct sockaddr_in) {
                        .sin_family = AF_INET,
                        .sin_addr.s_addr = hdr->src_addr.ip4.addr,
                        .sin_port = hdr->port,
                };
        }
}

static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
                              struct sockaddr_in6 *dst_addr,
                              struct cma_hdr *hdr,
                              __be16 local_port)
{
        if (src_addr) {
                *src_addr = (struct sockaddr_in6) {
                        .sin6_family = AF_INET6,
                        .sin6_addr = hdr->dst_addr.ip6,
                        .sin6_port = local_port,
                };
        }

        if (dst_addr) {
                *dst_addr = (struct sockaddr_in6) {
                        .sin6_family = AF_INET6,
                        .sin6_addr = hdr->src_addr.ip6,
                        .sin6_port = hdr->port,
                };
        }
}

static u16 cma_port_from_service_id(__be64 service_id)
{
        return (u16)be64_to_cpu(service_id);
}

static int cma_save_ip_info(struct sockaddr *src_addr,
                            struct sockaddr *dst_addr,
                            const struct ib_cm_event *ib_event,
                            __be64 service_id)
{
        struct cma_hdr *hdr;
        __be16 port;

        hdr = ib_event->private_data;
        if (hdr->cma_version != CMA_VERSION)
                return -EINVAL;

        port = htons(cma_port_from_service_id(service_id));

        switch (cma_get_ip_ver(hdr)) {
        case 4:
                cma_save_ip4_info((struct sockaddr_in *)src_addr,
                                  (struct sockaddr_in *)dst_addr, hdr, port);
                break;
        case 6:
                cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
                                  (struct sockaddr_in6 *)dst_addr, hdr, port);
                break;
        default:
                return -EAFNOSUPPORT;
        }

        return 0;
}

static int cma_save_net_info(struct sockaddr *src_addr,
                             struct sockaddr *dst_addr,
                             const struct rdma_cm_id *listen_id,
                             const struct ib_cm_event *ib_event,
                             sa_family_t sa_family, __be64 service_id)
{
        if (sa_family == AF_IB) {
                if (ib_event->event == IB_CM_REQ_RECEIVED)
                        cma_save_ib_info(src_addr, dst_addr, listen_id,
                                         ib_event->param.req_rcvd.primary_path);
                else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
                        cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
                return 0;
        }

        return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
}

static int cma_save_req_info(const struct ib_cm_event *ib_event,
                             struct cma_req_info *req)
{
        const struct ib_cm_req_event_param *req_param =
                &ib_event->param.req_rcvd;
        const struct ib_cm_sidr_req_event_param *sidr_param =
                &ib_event->param.sidr_req_rcvd;

        switch (ib_event->event) {
        case IB_CM_REQ_RECEIVED:
                req->device     = req_param->listen_id->device;
                req->port       = req_param->port;
                memcpy(&req->local_gid, &req_param->primary_path->sgid,
                       sizeof(req->local_gid));
                req->has_gid    = true;
                req->service_id = req_param->primary_path->service_id;
                req->pkey       = be16_to_cpu(req_param->primary_path->pkey);
                if (req->pkey != req_param->bth_pkey)
                        pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
                                            "RDMA CMA: in the future this may cause the request to be dropped\n",
                                            req_param->bth_pkey, req->pkey);
                break;
        case IB_CM_SIDR_REQ_RECEIVED:
                req->device     = sidr_param->listen_id->device;
                req->port       = sidr_param->port;
                req->has_gid    = false;
                req->service_id = sidr_param->service_id;
                req->pkey       = sidr_param->pkey;
                if (req->pkey != sidr_param->bth_pkey)
                        pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
                                            "RDMA CMA: in the future this may cause the request to be dropped\n",
                                            sidr_param->bth_pkey, req->pkey);
                break;
        default:
                return -EINVAL;
        }

        return 0;
}

static bool validate_ipv4_net_dev(struct net_device *net_dev,
                                  const struct sockaddr_in *dst_addr,
                                  const struct sockaddr_in *src_addr)
{
        __be32 daddr = dst_addr->sin_addr.s_addr,
               saddr = src_addr->sin_addr.s_addr;
        struct fib_result res;
        struct flowi4 fl4;
        int err;
        bool ret;

        if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
            ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
            ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
            ipv4_is_loopback(saddr))
                return false;

        memset(&fl4, 0, sizeof(fl4));
        fl4.flowi4_oif = net_dev->ifindex;
        fl4.daddr = daddr;
        fl4.saddr = saddr;

        rcu_read_lock();
        err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
        ret = err == 0 && FIB_RES_DEV(res) == net_dev;
        rcu_read_unlock();

        return ret;
}

static bool validate_ipv6_net_dev(struct net_device *net_dev,
                                  const struct sockaddr_in6 *dst_addr,
                                  const struct sockaddr_in6 *src_addr)
{
#if IS_ENABLED(CONFIG_IPV6)
        const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
                           IPV6_ADDR_LINKLOCAL;
        struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
                                         &src_addr->sin6_addr, net_dev->ifindex,
                                         NULL, strict);
        bool ret;

        if (!rt)
                return false;

        ret = rt->rt6i_idev->dev == net_dev;
        ip6_rt_put(rt);

        return ret;
#else
        return false;
#endif
}

static bool validate_net_dev(struct net_device *net_dev,
                             const struct sockaddr *daddr,
                             const struct sockaddr *saddr)
{
        const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
        const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
        const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
        const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;

        switch (daddr->sa_family) {
        case AF_INET:
                return saddr->sa_family == AF_INET &&
                       validate_ipv4_net_dev(net_dev, daddr4, saddr4);

        case AF_INET6:
                return saddr->sa_family == AF_INET6 &&
                       validate_ipv6_net_dev(net_dev, daddr6, saddr6);

        default:
                return false;
        }
}

static struct net_device *
roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
{
        const struct ib_gid_attr *sgid_attr = NULL;
        struct net_device *ndev;

        if (ib_event->event == IB_CM_REQ_RECEIVED)
                sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
        else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
                sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;

        if (!sgid_attr)
                return NULL;

        rcu_read_lock();
        ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
        if (IS_ERR(ndev))
                ndev = NULL;
        else
                dev_hold(ndev);
        rcu_read_unlock();
        return ndev;
}

static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
                                          struct cma_req_info *req)
{
        struct sockaddr *listen_addr =
                        (struct sockaddr *)&req->listen_addr_storage;
        struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
        struct net_device *net_dev;
        const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
        int err;

        err = cma_save_ip_info(listen_addr, src_addr, ib_event,
                               req->service_id);
        if (err)
                return ERR_PTR(err);

        if (rdma_protocol_roce(req->device, req->port))
                net_dev = roce_get_net_dev_by_cm_event(ib_event);
        else
                net_dev = ib_get_net_dev_by_params(req->device, req->port,
                                                   req->pkey,
                                                   gid, listen_addr);
        if (!net_dev)
                return ERR_PTR(-ENODEV);

        return net_dev;
}

static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
{
        return (be64_to_cpu(service_id) >> 16) & 0xffff;
}

static bool cma_match_private_data(struct rdma_id_private *id_priv,
                                   const struct cma_hdr *hdr)
{
        struct sockaddr *addr = cma_src_addr(id_priv);
        __be32 ip4_addr;
        struct in6_addr ip6_addr;

        if (cma_any_addr(addr) && !id_priv->afonly)
                return true;

        switch (addr->sa_family) {
        case AF_INET:
                ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
                if (cma_get_ip_ver(hdr) != 4)
                        return false;
                if (!cma_any_addr(addr) &&
                    hdr->dst_addr.ip4.addr != ip4_addr)
                        return false;
                break;
        case AF_INET6:
                ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
                if (cma_get_ip_ver(hdr) != 6)
                        return false;
                if (!cma_any_addr(addr) &&
                    memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
                        return false;
                break;
        case AF_IB:
                return true;
        default:
                return false;
        }

        return true;
}

static bool cma_protocol_roce(const struct rdma_cm_id *id)
{
        struct ib_device *device = id->device;
        const u32 port_num = id->port_num ?: rdma_start_port(device);

        return rdma_protocol_roce(device, port_num);
}

static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
{
        const struct sockaddr *daddr =
                        (const struct sockaddr *)&req->listen_addr_storage;
        const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;

        /* Returns true if the req is for IPv6 link local */
        return (daddr->sa_family == AF_INET6 &&
                (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
}

static bool cma_match_net_dev(const struct rdma_cm_id *id,
                              const struct net_device *net_dev,
                              const struct cma_req_info *req)
{
        const struct rdma_addr *addr = &id->route.addr;

        if (!net_dev)
                /* This request is an AF_IB request */
                return (!id->port_num || id->port_num == req->port) &&
                       (addr->src_addr.ss_family == AF_IB);

        /*
         * If the request is not for IPv6 link local, allow matching
         * request to any netdevice of the one or multiport rdma device.
         */
        if (!cma_is_req_ipv6_ll(req))
                return true;
        /*
         * Net namespaces must match, and if the listner is listening
         * on a specific netdevice than netdevice must match as well.
         */
        if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
            (!!addr->dev_addr.bound_dev_if ==
             (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
                return true;
        else
                return false;
}

static struct rdma_id_private *cma_find_listener(
                const struct rdma_bind_list *bind_list,
                const struct ib_cm_id *cm_id,
                const struct ib_cm_event *ib_event,
                const struct cma_req_info *req,
                const struct net_device *net_dev)
{
        struct rdma_id_private *id_priv, *id_priv_dev;

        lockdep_assert_held(&lock);

        if (!bind_list)
                return ERR_PTR(-EINVAL);

        hlist_for_each_entry(id_priv, &bind_list->owners, node) {
                if (cma_match_private_data(id_priv, ib_event->private_data)) {
                        if (id_priv->id.device == cm_id->device &&
                            cma_match_net_dev(&id_priv->id, net_dev, req))
                                return id_priv;
                        list_for_each_entry(id_priv_dev,
                                            &id_priv->listen_list,
                                            listen_item) {
                                if (id_priv_dev->id.device == cm_id->device &&
                                    cma_match_net_dev(&id_priv_dev->id,
                                                      net_dev, req))
                                        return id_priv_dev;
                        }
                }
        }

        return ERR_PTR(-EINVAL);
}

static struct rdma_id_private *
cma_ib_id_from_event(struct ib_cm_id *cm_id,
                     const struct ib_cm_event *ib_event,
                     struct cma_req_info *req,
                     struct net_device **net_dev)
{
        struct rdma_bind_list *bind_list;
        struct rdma_id_private *id_priv;
        int err;

        err = cma_save_req_info(ib_event, req);
        if (err)
                return ERR_PTR(err);

        *net_dev = cma_get_net_dev(ib_event, req);
        if (IS_ERR(*net_dev)) {
                if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
                        /* Assuming the protocol is AF_IB */
                        *net_dev = NULL;
                } else {
                        return ERR_CAST(*net_dev);
                }
        }

        mutex_lock(&lock);
        /*
         * Net namespace might be getting deleted while route lookup,
         * cm_id lookup is in progress. Therefore, perform netdevice
         * validation, cm_id lookup under rcu lock.
         * RCU lock along with netdevice state check, synchronizes with
         * netdevice migrating to different net namespace and also avoids
         * case where net namespace doesn't get deleted while lookup is in
         * progress.
         * If the device state is not IFF_UP, its properties such as ifindex
         * and nd_net cannot be trusted to remain valid without rcu lock.
         * net/core/dev.c change_net_namespace() ensures to synchronize with
         * ongoing operations on net device after device is closed using
         * synchronize_net().
         */
        rcu_read_lock();
        if (*net_dev) {
                /*
                 * If netdevice is down, it is likely that it is administratively
                 * down or it might be migrating to different namespace.
                 * In that case avoid further processing, as the net namespace
                 * or ifindex may change.
                 */
                if (((*net_dev)->flags & IFF_UP) == 0) {
                        id_priv = ERR_PTR(-EHOSTUNREACH);
                        goto err;
                }

                if (!validate_net_dev(*net_dev,
                                 (struct sockaddr *)&req->src_addr_storage,
                                 (struct sockaddr *)&req->listen_addr_storage)) {
                        id_priv = ERR_PTR(-EHOSTUNREACH);
                        goto err;
                }
        }

        bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
                                rdma_ps_from_service_id(req->service_id),
                                cma_port_from_service_id(req->service_id));
        id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
err:
        rcu_read_unlock();
        mutex_unlock(&lock);
        if (IS_ERR(id_priv) && *net_dev) {
                dev_put(*net_dev);
                *net_dev = NULL;
        }
        return id_priv;
}

static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
{
        return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
}

static void cma_cancel_route(struct rdma_id_private *id_priv)
{
        if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
                if (id_priv->query)
                        ib_sa_cancel_query(id_priv->query_id, id_priv->query);
        }
}

static void _cma_cancel_listens(struct rdma_id_private *id_priv)
{
        struct rdma_id_private *dev_id_priv;

        lockdep_assert_held(&lock);

        /*
         * Remove from listen_any_list to prevent added devices from spawning
         * additional listen requests.
         */
        list_del_init(&id_priv->listen_any_item);

        while (!list_empty(&id_priv->listen_list)) {
                dev_id_priv =
                        list_first_entry(&id_priv->listen_list,
                                         struct rdma_id_private, listen_item);
                /* sync with device removal to avoid duplicate destruction */
                list_del_init(&dev_id_priv->device_item);
                list_del_init(&dev_id_priv->listen_item);
                mutex_unlock(&lock);

                rdma_destroy_id(&dev_id_priv->id);
                mutex_lock(&lock);
        }
}

static void cma_cancel_listens(struct rdma_id_private *id_priv)
{
        mutex_lock(&lock);
        _cma_cancel_listens(id_priv);
        mutex_unlock(&lock);
}

static void cma_cancel_operation(struct rdma_id_private *id_priv,
                                 enum rdma_cm_state state)
{
        switch (state) {
        case RDMA_CM_ADDR_QUERY:
                /*
                 * We can avoid doing the rdma_addr_cancel() based on state,
                 * only RDMA_CM_ADDR_QUERY has a work that could still execute.
                 * Notice that the addr_handler work could still be exiting
                 * outside this state, however due to the interaction with the
                 * handler_mutex the work is guaranteed not to touch id_priv
                 * during exit.
                 */
                rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
                break;
        case RDMA_CM_ROUTE_QUERY:
                cma_cancel_route(id_priv);
                break;
        case RDMA_CM_LISTEN:
                if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
                        cma_cancel_listens(id_priv);
                break;
        default:
                break;
        }
}

static void cma_release_port(struct rdma_id_private *id_priv)
{
        struct rdma_bind_list *bind_list = id_priv->bind_list;
        struct net *net = id_priv->id.route.addr.dev_addr.net;

        if (!bind_list)
                return;

        mutex_lock(&lock);
        hlist_del(&id_priv->node);
        if (hlist_empty(&bind_list->owners)) {
                cma_ps_remove(net, bind_list->ps, bind_list->port);
                kfree(bind_list);
        }
        mutex_unlock(&lock);
}

static void destroy_mc(struct rdma_id_private *id_priv,
                       struct cma_multicast *mc)
{
        bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);

        if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
                ib_sa_free_multicast(mc->sa_mc);

        if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
                struct rdma_cm_event *event = &mc->iboe_join.event;
                struct rdma_dev_addr *dev_addr =
                        &id_priv->id.route.addr.dev_addr;
                struct net_device *ndev = NULL;

                if (dev_addr->bound_dev_if)
                        ndev = dev_get_by_index(dev_addr->net,
                                                dev_addr->bound_dev_if);
                if (ndev && !send_only) {
                        enum ib_gid_type gid_type;
                        union ib_gid mgid;

                        gid_type = id_priv->cma_dev->default_gid_type
                                           [id_priv->id.port_num -
                                            rdma_start_port(
                                                    id_priv->cma_dev->device)];
                        cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
                                          gid_type);
                        cma_igmp_send(ndev, &mgid, false);
                }
                dev_put(ndev);

                cancel_work_sync(&mc->iboe_join.work);
                if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
                        rdma_destroy_ah_attr(&event->param.ud.ah_attr);
        }
        kfree(mc);
}

static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
{
        struct cma_multicast *mc;

        while (!list_empty(&id_priv->mc_list)) {
                mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
                                      list);
                list_del(&mc->list);
                destroy_mc(id_priv, mc);
        }
}

static void _destroy_id(struct rdma_id_private *id_priv,
                        enum rdma_cm_state state)
{
        cma_cancel_operation(id_priv, state);

        rdma_restrack_del(&id_priv->res);
        cma_remove_id_from_tree(id_priv);
        if (id_priv->cma_dev) {
                if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
                        if (id_priv->cm_id.ib)
                                ib_destroy_cm_id(id_priv->cm_id.ib);
                } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
                        if (id_priv->cm_id.iw)
                                iw_destroy_cm_id(id_priv->cm_id.iw);
                }
                cma_leave_mc_groups(id_priv);
                cma_release_dev(id_priv);
        }

        cma_release_port(id_priv);
        cma_id_put(id_priv);
        wait_for_completion(&id_priv->comp);

        if (id_priv->internal_id)
                cma_id_put(id_priv->id.context);

        kfree(id_priv->id.route.path_rec);
        kfree(id_priv->id.route.path_rec_inbound);
        kfree(id_priv->id.route.path_rec_outbound);
        kfree(id_priv->id.route.service_recs);

        put_net(id_priv->id.route.addr.dev_addr.net);
        kfree(id_priv);
}

/*
 * destroy an ID from within the handler_mutex. This ensures that no other
 * handlers can start running concurrently.
 */
static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
        __releases(&idprv->handler_mutex)
{
        enum rdma_cm_state state;
        unsigned long flags;

        trace_cm_id_destroy(id_priv);

        /*
         * Setting the state to destroyed under the handler mutex provides a
         * fence against calling handler callbacks. If this is invoked due to
         * the failure of a handler callback then it guarentees that no future
         * handlers will be called.
         */
        lockdep_assert_held(&id_priv->handler_mutex);
        spin_lock_irqsave(&id_priv->lock, flags);
        state = id_priv->state;
        id_priv->state = RDMA_CM_DESTROYING;
        spin_unlock_irqrestore(&id_priv->lock, flags);
        mutex_unlock(&id_priv->handler_mutex);
        _destroy_id(id_priv, state);
}

void rdma_destroy_id(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        mutex_lock(&id_priv->handler_mutex);
        destroy_id_handler_unlock(id_priv);
}
EXPORT_SYMBOL(rdma_destroy_id);

static int cma_rep_recv(struct rdma_id_private *id_priv)
{
        int ret;

        ret = cma_modify_qp_rtr(id_priv, NULL);
        if (ret)
                goto reject;

        ret = cma_modify_qp_rts(id_priv, NULL);
        if (ret)
                goto reject;

        trace_cm_send_rtu(id_priv);
        ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
        if (ret)
                goto reject;

        return 0;
reject:
        pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
        cma_modify_qp_err(id_priv);
        trace_cm_send_rej(id_priv);
        ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
                       NULL, 0, NULL, 0);
        return ret;
}

static void cma_set_rep_event_data(struct rdma_cm_event *event,
                                   const struct ib_cm_rep_event_param *rep_data,
                                   void *private_data)
{
        event->param.conn.private_data = private_data;
        event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
        event->param.conn.responder_resources = rep_data->responder_resources;
        event->param.conn.initiator_depth = rep_data->initiator_depth;
        event->param.conn.flow_control = rep_data->flow_control;
        event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
        event->param.conn.srq = rep_data->srq;
        event->param.conn.qp_num = rep_data->remote_qpn;

        event->ece.vendor_id = rep_data->ece.vendor_id;
        event->ece.attr_mod = rep_data->ece.attr_mod;
}

static int cma_cm_event_handler(struct rdma_id_private *id_priv,
                                struct rdma_cm_event *event)
{
        int ret;

        lockdep_assert_held(&id_priv->handler_mutex);

        trace_cm_event_handler(id_priv, event);
        ret = id_priv->id.event_handler(&id_priv->id, event);
        trace_cm_event_done(id_priv, event, ret);
        return ret;
}

static int cma_ib_handler(struct ib_cm_id *cm_id,
                          const struct ib_cm_event *ib_event)
{
        struct rdma_id_private *id_priv = cm_id->context;
        struct rdma_cm_event event = {};
        enum rdma_cm_state state;
        int ret;

        mutex_lock(&id_priv->handler_mutex);
        state = READ_ONCE(id_priv->state);
        if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
             state != RDMA_CM_CONNECT) ||
            (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
             state != RDMA_CM_DISCONNECT))
                goto out;

        switch (ib_event->event) {
        case IB_CM_REQ_ERROR:
        case IB_CM_REP_ERROR:
                event.event = RDMA_CM_EVENT_UNREACHABLE;
                event.status = -ETIMEDOUT;
                break;
        case IB_CM_REP_RECEIVED:
                if (state == RDMA_CM_CONNECT &&
                    (id_priv->id.qp_type != IB_QPT_UD)) {
                        trace_cm_prepare_mra(id_priv);
                        ib_prepare_cm_mra(cm_id);
                }
                if (id_priv->id.qp) {
                        event.status = cma_rep_recv(id_priv);
                        event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
                                                     RDMA_CM_EVENT_ESTABLISHED;
                } else {
                        event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
                }
                cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
                                       ib_event->private_data);
                break;
        case IB_CM_RTU_RECEIVED:
        case IB_CM_USER_ESTABLISHED:
                event.event = RDMA_CM_EVENT_ESTABLISHED;
                break;
        case IB_CM_DREQ_ERROR:
                event.status = -ETIMEDOUT;
                fallthrough;
        case IB_CM_DREQ_RECEIVED:
        case IB_CM_DREP_RECEIVED:
                if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
                                   RDMA_CM_DISCONNECT))
                        goto out;
                event.event = RDMA_CM_EVENT_DISCONNECTED;
                break;
        case IB_CM_TIMEWAIT_EXIT:
                event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
                break;
        case IB_CM_MRA_RECEIVED:
                /* ignore event */
                goto out;
        case IB_CM_REJ_RECEIVED:
                pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
                                                                                ib_event->param.rej_rcvd.reason));
                cma_modify_qp_err(id_priv);
                event.status = ib_event->param.rej_rcvd.reason;
                event.event = RDMA_CM_EVENT_REJECTED;
                event.param.conn.private_data = ib_event->private_data;
                event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
                break;
        default:
                pr_err("RDMA CMA: unexpected IB CM event: %d\n",
                       ib_event->event);
                goto out;
        }

        ret = cma_cm_event_handler(id_priv, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                destroy_id_handler_unlock(id_priv);
                return ret;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        return 0;
}

static struct rdma_id_private *
cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
                   const struct ib_cm_event *ib_event,
                   struct net_device *net_dev)
{
        struct rdma_id_private *listen_id_priv;
        struct rdma_id_private *id_priv;
        struct rdma_cm_id *id;
        struct rdma_route *rt;
        const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
        struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
        const __be64 service_id =
                ib_event->param.req_rcvd.primary_path->service_id;
        int ret;

        listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
        id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
                                   listen_id->event_handler, listen_id->context,
                                   listen_id->ps,
                                   ib_event->param.req_rcvd.qp_type,
                                   listen_id_priv);
        if (IS_ERR(id_priv))
                return NULL;

        id = &id_priv->id;
        if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
                              (struct sockaddr *)&id->route.addr.dst_addr,
                              listen_id, ib_event, ss_family, service_id))
                goto err;

        rt = &id->route;
        rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
        rt->path_rec = kmalloc_objs(*rt->path_rec, rt->num_pri_alt_paths);
        if (!rt->path_rec)
                goto err;

        rt->path_rec[0] = *path;
        if (rt->num_pri_alt_paths == 2)
                rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;

        if (net_dev) {
                rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
        } else {
                if (!cma_protocol_roce(listen_id) &&
                    cma_any_addr(cma_src_addr(id_priv))) {
                        rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
                        rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
                        ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
                } else if (!cma_any_addr(cma_src_addr(id_priv))) {
                        ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
                        if (ret)
                                goto err;
                }
        }
        rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);

        id_priv->state = RDMA_CM_CONNECT;
        return id_priv;

err:
        rdma_destroy_id(id);
        return NULL;
}

static struct rdma_id_private *
cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
                  const struct ib_cm_event *ib_event,
                  struct net_device *net_dev)
{
        const struct rdma_id_private *listen_id_priv;
        struct rdma_id_private *id_priv;
        struct rdma_cm_id *id;
        const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
        struct net *net = listen_id->route.addr.dev_addr.net;
        int ret;

        listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
        id_priv = __rdma_create_id(net, listen_id->event_handler,
                                   listen_id->context, listen_id->ps, IB_QPT_UD,
                                   listen_id_priv);
        if (IS_ERR(id_priv))
                return NULL;

        id = &id_priv->id;
        if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
                              (struct sockaddr *)&id->route.addr.dst_addr,
                              listen_id, ib_event, ss_family,
                              ib_event->param.sidr_req_rcvd.service_id))
                goto err;

        if (net_dev) {
                rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
        } else {
                if (!cma_any_addr(cma_src_addr(id_priv))) {
                        ret = cma_translate_addr(cma_src_addr(id_priv),
                                                 &id->route.addr.dev_addr);
                        if (ret)
                                goto err;
                }
        }

        id_priv->state = RDMA_CM_CONNECT;
        return id_priv;
err:
        rdma_destroy_id(id);
        return NULL;
}

static void cma_set_req_event_data(struct rdma_cm_event *event,
                                   const struct ib_cm_req_event_param *req_data,
                                   void *private_data, int offset)
{
        event->param.conn.private_data = private_data + offset;
        event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
        event->param.conn.responder_resources = req_data->responder_resources;
        event->param.conn.initiator_depth = req_data->initiator_depth;
        event->param.conn.flow_control = req_data->flow_control;
        event->param.conn.retry_count = req_data->retry_count;
        event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
        event->param.conn.srq = req_data->srq;
        event->param.conn.qp_num = req_data->remote_qpn;

        event->ece.vendor_id = req_data->ece.vendor_id;
        event->ece.attr_mod = req_data->ece.attr_mod;
}

static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
                                    const struct ib_cm_event *ib_event)
{
        return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
                 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
                ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
                 (id->qp_type == IB_QPT_UD)) ||
                (!id->qp_type));
}

static int cma_ib_req_handler(struct ib_cm_id *cm_id,
                              const struct ib_cm_event *ib_event)
{
        struct rdma_id_private *listen_id, *conn_id = NULL;
        struct rdma_cm_event event = {};
        struct cma_req_info req = {};
        struct net_device *net_dev;
        u8 offset;
        int ret;

        listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
        if (IS_ERR(listen_id))
                return PTR_ERR(listen_id);

        trace_cm_req_handler(listen_id, ib_event->event);
        if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
                ret = -EINVAL;
                goto net_dev_put;
        }

        mutex_lock(&listen_id->handler_mutex);
        if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
                ret = -ECONNABORTED;
                goto err_unlock;
        }

        offset = cma_user_data_offset(listen_id);
        event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
        if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
                conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
                event.param.ud.private_data = ib_event->private_data + offset;
                event.param.ud.private_data_len =
                                IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
        } else {
                conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
                cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
                                       ib_event->private_data, offset);
        }
        if (!conn_id) {
                ret = -ENOMEM;
                goto err_unlock;
        }

        mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
        ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
        if (ret) {
                destroy_id_handler_unlock(conn_id);
                goto err_unlock;
        }

        conn_id->cm_id.ib = cm_id;
        cm_id->context = conn_id;
        cm_id->cm_handler = cma_ib_handler;

        ret = cma_cm_event_handler(conn_id, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                conn_id->cm_id.ib = NULL;
                mutex_unlock(&listen_id->handler_mutex);
                destroy_id_handler_unlock(conn_id);
                goto net_dev_put;
        }

        if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
            conn_id->id.qp_type != IB_QPT_UD) {
                trace_cm_prepare_mra(cm_id->context);
                ib_prepare_cm_mra(cm_id);
        }
        mutex_unlock(&conn_id->handler_mutex);

err_unlock:
        mutex_unlock(&listen_id->handler_mutex);

net_dev_put:
        dev_put(net_dev);

        return ret;
}

__be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
{
        if (addr->sa_family == AF_IB)
                return ((struct sockaddr_ib *) addr)->sib_sid;

        return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
}
EXPORT_SYMBOL(rdma_get_service_id);

void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
                    union ib_gid *dgid)
{
        struct rdma_addr *addr = &cm_id->route.addr;

        if (!cm_id->device) {
                if (sgid)
                        memset(sgid, 0, sizeof(*sgid));
                if (dgid)
                        memset(dgid, 0, sizeof(*dgid));
                return;
        }

        if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
                if (sgid)
                        rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
                if (dgid)
                        rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
        } else {
                if (sgid)
                        rdma_addr_get_sgid(&addr->dev_addr, sgid);
                if (dgid)
                        rdma_addr_get_dgid(&addr->dev_addr, dgid);
        }
}
EXPORT_SYMBOL(rdma_read_gids);

static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
{
        struct rdma_id_private *id_priv = iw_id->context;
        struct rdma_cm_event event = {};
        int ret = 0;
        struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
        struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;

        mutex_lock(&id_priv->handler_mutex);
        if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
                goto out;

        switch (iw_event->event) {
        case IW_CM_EVENT_CLOSE:
                event.event = RDMA_CM_EVENT_DISCONNECTED;
                break;
        case IW_CM_EVENT_CONNECT_REPLY:
                memcpy(cma_src_addr(id_priv), laddr,
                       rdma_addr_size(laddr));
                memcpy(cma_dst_addr(id_priv), raddr,
                       rdma_addr_size(raddr));
                switch (iw_event->status) {
                case 0:
                        event.event = RDMA_CM_EVENT_ESTABLISHED;
                        event.param.conn.initiator_depth = iw_event->ird;
                        event.param.conn.responder_resources = iw_event->ord;
                        break;
                case -ECONNRESET:
                case -ECONNREFUSED:
                        event.event = RDMA_CM_EVENT_REJECTED;
                        break;
                case -ETIMEDOUT:
                        event.event = RDMA_CM_EVENT_UNREACHABLE;
                        break;
                default:
                        event.event = RDMA_CM_EVENT_CONNECT_ERROR;
                        break;
                }
                break;
        case IW_CM_EVENT_ESTABLISHED:
                event.event = RDMA_CM_EVENT_ESTABLISHED;
                event.param.conn.initiator_depth = iw_event->ird;
                event.param.conn.responder_resources = iw_event->ord;
                break;
        default:
                goto out;
        }

        event.status = iw_event->status;
        event.param.conn.private_data = iw_event->private_data;
        event.param.conn.private_data_len = iw_event->private_data_len;
        ret = cma_cm_event_handler(id_priv, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.iw = NULL;
                destroy_id_handler_unlock(id_priv);
                return ret;
        }

out:
        mutex_unlock(&id_priv->handler_mutex);
        return ret;
}

static int iw_conn_req_handler(struct iw_cm_id *cm_id,
                               struct iw_cm_event *iw_event)
{
        struct rdma_id_private *listen_id, *conn_id;
        struct rdma_cm_event event = {};
        int ret = -ECONNABORTED;
        struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
        struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;

        event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
        event.param.conn.private_data = iw_event->private_data;
        event.param.conn.private_data_len = iw_event->private_data_len;
        event.param.conn.initiator_depth = iw_event->ird;
        event.param.conn.responder_resources = iw_event->ord;

        listen_id = cm_id->context;

        mutex_lock(&listen_id->handler_mutex);
        if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
                goto out;

        /* Create a new RDMA id for the new IW CM ID */
        conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
                                   listen_id->id.event_handler,
                                   listen_id->id.context, RDMA_PS_TCP,
                                   IB_QPT_RC, listen_id);
        if (IS_ERR(conn_id)) {
                ret = -ENOMEM;
                goto out;
        }
        mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
        conn_id->state = RDMA_CM_CONNECT;

        ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
        if (ret) {
                mutex_unlock(&listen_id->handler_mutex);
                destroy_id_handler_unlock(conn_id);
                return ret;
        }

        ret = cma_iw_acquire_dev(conn_id, listen_id);
        if (ret) {
                mutex_unlock(&listen_id->handler_mutex);
                destroy_id_handler_unlock(conn_id);
                return ret;
        }

        conn_id->cm_id.iw = cm_id;
        cm_id->context = conn_id;
        cm_id->cm_handler = cma_iw_handler;

        memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
        memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));

        ret = cma_cm_event_handler(conn_id, &event);
        if (ret) {
                /* User wants to destroy the CM ID */
                conn_id->cm_id.iw = NULL;
                mutex_unlock(&listen_id->handler_mutex);
                destroy_id_handler_unlock(conn_id);
                return ret;
        }

        mutex_unlock(&conn_id->handler_mutex);

out:
        mutex_unlock(&listen_id->handler_mutex);
        return ret;
}

static int cma_ib_listen(struct rdma_id_private *id_priv)
{
        struct sockaddr *addr;
        struct ib_cm_id *id;
        __be64 svc_id;

        addr = cma_src_addr(id_priv);
        svc_id = rdma_get_service_id(&id_priv->id, addr);
        id = ib_cm_insert_listen(id_priv->id.device,
                                 cma_ib_req_handler, svc_id);
        if (IS_ERR(id))
                return PTR_ERR(id);
        id_priv->cm_id.ib = id;

        return 0;
}

static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
{
        int ret;
        struct iw_cm_id *id;

        id = iw_create_cm_id(id_priv->id.device,
                             iw_conn_req_handler,
                             id_priv);
        if (IS_ERR(id))
                return PTR_ERR(id);

        mutex_lock(&id_priv->qp_mutex);
        id->tos = id_priv->tos;
        id->tos_set = id_priv->tos_set;
        mutex_unlock(&id_priv->qp_mutex);
        id->afonly = id_priv->afonly;
        id_priv->cm_id.iw = id;

        memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
               rdma_addr_size(cma_src_addr(id_priv)));

        ret = iw_cm_listen(id_priv->cm_id.iw, backlog);

        if (ret) {
                iw_destroy_cm_id(id_priv->cm_id.iw);
                id_priv->cm_id.iw = NULL;
        }

        return ret;
}

static int cma_listen_handler(struct rdma_cm_id *id,
                              struct rdma_cm_event *event)
{
        struct rdma_id_private *id_priv = id->context;

        /* Listening IDs are always destroyed on removal */
        if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
                return -1;

        id->context = id_priv->id.context;
        id->event_handler = id_priv->id.event_handler;
        trace_cm_event_handler(id_priv, event);
        return id_priv->id.event_handler(id, event);
}

static int cma_listen_on_dev(struct rdma_id_private *id_priv,
                             struct cma_device *cma_dev,
                             struct rdma_id_private **to_destroy)
{
        struct rdma_id_private *dev_id_priv;
        struct net *net = id_priv->id.route.addr.dev_addr.net;
        int ret;

        lockdep_assert_held(&lock);

        *to_destroy = NULL;
        if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
                return 0;
        if (id_priv->restricted_node_type != RDMA_NODE_UNSPECIFIED &&
            id_priv->restricted_node_type != cma_dev->device->node_type)
                return 0;

        dev_id_priv =
                __rdma_create_id(net, cma_listen_handler, id_priv,
                                 id_priv->id.ps, id_priv->id.qp_type, id_priv);
        if (IS_ERR(dev_id_priv))
                return PTR_ERR(dev_id_priv);

        dev_id_priv->restricted_node_type = id_priv->restricted_node_type;
        dev_id_priv->state = RDMA_CM_ADDR_BOUND;
        memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
               rdma_addr_size(cma_src_addr(id_priv)));

        _cma_attach_to_dev(dev_id_priv, cma_dev);
        rdma_restrack_add(&dev_id_priv->res);
        cma_id_get(id_priv);
        dev_id_priv->internal_id = 1;
        dev_id_priv->afonly = id_priv->afonly;
        mutex_lock(&id_priv->qp_mutex);
        dev_id_priv->tos_set = id_priv->tos_set;
        dev_id_priv->tos = id_priv->tos;
        mutex_unlock(&id_priv->qp_mutex);

        ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
        if (ret)
                goto err_listen;
        list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
        return 0;
err_listen:
        /* Caller must destroy this after releasing lock */
        *to_destroy = dev_id_priv;
        dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
        return ret;
}

static int cma_listen_on_all(struct rdma_id_private *id_priv)
{
        struct rdma_id_private *to_destroy;
        struct cma_device *cma_dev;
        int ret;

        mutex_lock(&lock);
        list_add_tail(&id_priv->listen_any_item, &listen_any_list);
        list_for_each_entry(cma_dev, &dev_list, list) {
                ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
                if (ret) {
                        /* Prevent racing with cma_process_remove() */
                        if (to_destroy)
                                list_del_init(&to_destroy->device_item);
                        goto err_listen;
                }
        }
        mutex_unlock(&lock);
        return 0;

err_listen:
        _cma_cancel_listens(id_priv);
        mutex_unlock(&lock);
        if (to_destroy)
                rdma_destroy_id(&to_destroy->id);
        return ret;
}

void rdma_set_service_type(struct rdma_cm_id *id, int tos)
{
        struct rdma_id_private *id_priv;

        id_priv = container_of(id, struct rdma_id_private, id);
        mutex_lock(&id_priv->qp_mutex);
        id_priv->tos = (u8) tos;
        id_priv->tos_set = true;
        mutex_unlock(&id_priv->qp_mutex);
}
EXPORT_SYMBOL(rdma_set_service_type);

/**
 * rdma_set_ack_timeout() - Set the ack timeout of QP associated
 *                          with a connection identifier.
 * @id: Communication identifier to associated with service type.
 * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
 *
 * This function should be called before rdma_connect() on active side,
 * and on passive side before rdma_accept(). It is applicable to primary
 * path only. The timeout will affect the local side of the QP, it is not
 * negotiated with remote side and zero disables the timer. In case it is
 * set before rdma_resolve_route, the value will also be used to determine
 * PacketLifeTime for RoCE.
 *
 * Return: 0 for success
 */
int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
{
        struct rdma_id_private *id_priv;

        if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI)
                return -EINVAL;

        id_priv = container_of(id, struct rdma_id_private, id);
        mutex_lock(&id_priv->qp_mutex);
        id_priv->timeout = timeout;
        id_priv->timeout_set = true;
        mutex_unlock(&id_priv->qp_mutex);

        return 0;
}
EXPORT_SYMBOL(rdma_set_ack_timeout);

/**
 * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
 *                            QP associated with a connection identifier.
 * @id: Communication identifier to associated with service type.
 * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
 *                 Timer Field" in the IBTA specification.
 *
 * This function should be called before rdma_connect() on active
 * side, and on passive side before rdma_accept(). The timer value
 * will be associated with the local QP. When it receives a send it is
 * not read to handle, typically if the receive queue is empty, an RNR
 * Retry NAK is returned to the requester with the min_rnr_timer
 * encoded. The requester will then wait at least the time specified
 * in the NAK before retrying. The default is zero, which translates
 * to a minimum RNR Timer value of 655 ms.
 *
 * Return: 0 for success
 */
int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
{
        struct rdma_id_private *id_priv;

        /* It is a five-bit value */
        if (min_rnr_timer & 0xe0)
                return -EINVAL;

        if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
                return -EINVAL;

        id_priv = container_of(id, struct rdma_id_private, id);
        mutex_lock(&id_priv->qp_mutex);
        id_priv->min_rnr_timer = min_rnr_timer;
        id_priv->min_rnr_timer_set = true;
        mutex_unlock(&id_priv->qp_mutex);

        return 0;
}
EXPORT_SYMBOL(rdma_set_min_rnr_timer);

static int route_set_path_rec_inbound(struct cma_work *work,
                                      struct sa_path_rec *path_rec)
{
        struct rdma_route *route = &work->id->id.route;

        if (!route->path_rec_inbound) {
                route->path_rec_inbound = kzalloc_obj(*route->path_rec_inbound);
                if (!route->path_rec_inbound)
                        return -ENOMEM;
        }

        *route->path_rec_inbound = *path_rec;
        return 0;
}

static int route_set_path_rec_outbound(struct cma_work *work,
                                       struct sa_path_rec *path_rec)
{
        struct rdma_route *route = &work->id->id.route;

        if (!route->path_rec_outbound) {
                route->path_rec_outbound = kzalloc_obj(*route->path_rec_outbound);
                if (!route->path_rec_outbound)
                        return -ENOMEM;
        }

        *route->path_rec_outbound = *path_rec;
        return 0;
}

static void cma_query_handler(int status, struct sa_path_rec *path_rec,
                              unsigned int num_prs, void *context)
{
        struct cma_work *work = context;
        struct rdma_route *route;
        int i;

        route = &work->id->id.route;

        if (status)
                goto fail;

        for (i = 0; i < num_prs; i++) {
                if (!path_rec[i].flags || (path_rec[i].flags & IB_PATH_GMP))
                        *route->path_rec = path_rec[i];
                else if (path_rec[i].flags & IB_PATH_INBOUND)
                        status = route_set_path_rec_inbound(work, &path_rec[i]);
                else if (path_rec[i].flags & IB_PATH_OUTBOUND)
                        status = route_set_path_rec_outbound(work,
                                                             &path_rec[i]);
                else
                        status = -EINVAL;

                if (status)
                        goto fail;
        }

        route->num_pri_alt_paths = 1;
        queue_work(cma_wq, &work->work);
        return;

fail:
        work->old_state = RDMA_CM_ROUTE_QUERY;
        work->new_state = RDMA_CM_ADDR_RESOLVED;
        work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
        work->event.status = status;
        pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
                             status);
        queue_work(cma_wq, &work->work);
}

static int cma_query_ib_route(struct rdma_id_private *id_priv,
                              unsigned long timeout_ms, struct cma_work *work)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        struct sa_path_rec path_rec;
        ib_sa_comp_mask comp_mask;
        struct sockaddr_in6 *sin6;
        struct sockaddr_ib *sib;

        memset(&path_rec, 0, sizeof path_rec);

        if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
                path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
        else
                path_rec.rec_type = SA_PATH_REC_TYPE_IB;
        rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
        rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
        path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
        path_rec.numb_path = 1;
        path_rec.reversible = 1;
        path_rec.service_id = rdma_get_service_id(&id_priv->id,
                                                  cma_dst_addr(id_priv));

        comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
                    IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
                    IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;

        switch (cma_family(id_priv)) {
        case AF_INET:
                path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
                comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
                break;
        case AF_INET6:
                sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
                path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
                comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
                break;
        case AF_IB:
                sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
                path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
                comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
                break;
        }

        id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
                                               id_priv->id.port_num, &path_rec,
                                               comp_mask, timeout_ms,
                                               GFP_KERNEL, cma_query_handler,
                                               work, &id_priv->query);

        return (id_priv->query_id < 0) ? id_priv->query_id : 0;
}

static void cma_iboe_join_work_handler(struct work_struct *work)
{
        struct cma_multicast *mc =
                container_of(work, struct cma_multicast, iboe_join.work);
        struct rdma_cm_event *event = &mc->iboe_join.event;
        struct rdma_id_private *id_priv = mc->id_priv;
        int ret;

        mutex_lock(&id_priv->handler_mutex);
        if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
            READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
                goto out_unlock;

        ret = cma_cm_event_handler(id_priv, event);
        WARN_ON(ret);

out_unlock:
        mutex_unlock(&id_priv->handler_mutex);
        if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
                rdma_destroy_ah_attr(&event->param.ud.ah_attr);
}

static void cma_work_handler(struct work_struct *_work)
{
        struct cma_work *work = container_of(_work, struct cma_work, work);
        struct rdma_id_private *id_priv = work->id;

        mutex_lock(&id_priv->handler_mutex);
        if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
            READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
                goto out_unlock;
        if (work->old_state != 0 || work->new_state != 0) {
                if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
                        goto out_unlock;
        }

        if (cma_cm_event_handler(id_priv, &work->event)) {
                cma_id_put(id_priv);
                destroy_id_handler_unlock(id_priv);
                goto out_free;
        }

out_unlock:
        mutex_unlock(&id_priv->handler_mutex);
        cma_id_put(id_priv);
out_free:
        if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
                rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
        kfree(work);
}

static void cma_init_resolve_route_work(struct cma_work *work,
                                        struct rdma_id_private *id_priv)
{
        work->id = id_priv;
        INIT_WORK(&work->work, cma_work_handler);
        work->old_state = RDMA_CM_ROUTE_QUERY;
        work->new_state = RDMA_CM_ROUTE_RESOLVED;
        work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
}

static void enqueue_resolve_addr_work(struct cma_work *work,
                                      struct rdma_id_private *id_priv)
{
        /* Balances with cma_id_put() in cma_work_handler */
        cma_id_get(id_priv);

        work->id = id_priv;
        INIT_WORK(&work->work, cma_work_handler);
        work->old_state = RDMA_CM_ADDR_QUERY;
        work->new_state = RDMA_CM_ADDR_RESOLVED;
        work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;

        queue_work(cma_wq, &work->work);
}

static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
                                unsigned long timeout_ms)
{
        struct rdma_route *route = &id_priv->id.route;
        struct cma_work *work;
        int ret;

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        cma_init_resolve_route_work(work, id_priv);

        if (!route->path_rec)
                route->path_rec = kmalloc_obj(*route->path_rec);
        if (!route->path_rec) {
                ret = -ENOMEM;
                goto err1;
        }

        ret = cma_query_ib_route(id_priv, timeout_ms, work);
        if (ret)
                goto err2;

        return 0;
err2:
        kfree(route->path_rec);
        route->path_rec = NULL;
err1:
        kfree(work);
        return ret;
}

static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
                                           unsigned long supported_gids,
                                           enum ib_gid_type default_gid)
{
        if ((network_type == RDMA_NETWORK_IPV4 ||
             network_type == RDMA_NETWORK_IPV6) &&
            test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
                return IB_GID_TYPE_ROCE_UDP_ENCAP;

        return default_gid;
}

/*
 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
 * path record type based on GID type.
 * It also sets up other L2 fields which includes destination mac address
 * netdev ifindex, of the path record.
 * It returns the netdev of the bound interface for this path record entry.
 */
static struct net_device *
cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
{
        struct rdma_route *route = &id_priv->id.route;
        enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
        struct rdma_addr *addr = &route->addr;
        unsigned long supported_gids;
        struct net_device *ndev;

        if (!addr->dev_addr.bound_dev_if)
                return NULL;

        ndev = dev_get_by_index(addr->dev_addr.net,
                                addr->dev_addr.bound_dev_if);
        if (!ndev)
                return NULL;

        supported_gids = roce_gid_type_mask_support(id_priv->id.device,
                                                    id_priv->id.port_num);
        gid_type = cma_route_gid_type(addr->dev_addr.network,
                                      supported_gids,
                                      id_priv->gid_type);
        /* Use the hint from IP Stack to select GID Type */
        if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
                gid_type = ib_network_to_gid_type(addr->dev_addr.network);
        route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);

        route->path_rec->roce.route_resolved = true;
        sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
        return ndev;
}

int rdma_set_ib_path(struct rdma_cm_id *id,
                     struct sa_path_rec *path_rec)
{
        struct rdma_id_private *id_priv;
        struct net_device *ndev;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
                           RDMA_CM_ROUTE_RESOLVED))
                return -EINVAL;

        id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
                                     GFP_KERNEL);
        if (!id->route.path_rec) {
                ret = -ENOMEM;
                goto err;
        }

        if (rdma_protocol_roce(id->device, id->port_num)) {
                ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
                if (!ndev) {
                        ret = -ENODEV;
                        goto err_free;
                }
                dev_put(ndev);
        }

        id->route.num_pri_alt_paths = 1;
        return 0;

err_free:
        kfree(id->route.path_rec);
        id->route.path_rec = NULL;
err:
        cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
        return ret;
}
EXPORT_SYMBOL(rdma_set_ib_path);

static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
{
        struct cma_work *work;

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        cma_init_resolve_route_work(work, id_priv);
        queue_work(cma_wq, &work->work);
        return 0;
}

static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
{
        struct net_device *dev;

        dev = vlan_dev_real_dev(vlan_ndev);
        if (dev->num_tc)
                return netdev_get_prio_tc_map(dev, prio);

        return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
                VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
}

struct iboe_prio_tc_map {
        int input_prio;
        int output_tc;
        bool found;
};

static int get_lower_vlan_dev_tc(struct net_device *dev,
                                 struct netdev_nested_priv *priv)
{
        struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;

        if (is_vlan_dev(dev))
                map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
        else if (dev->num_tc)
                map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
        else
                map->output_tc = 0;
        /* We are interested only in first level VLAN device, so always
         * return 1 to stop iterating over next level devices.
         */
        map->found = true;
        return 1;
}

static int iboe_tos_to_sl(struct net_device *ndev, int tos)
{
        struct iboe_prio_tc_map prio_tc_map = {};
        int prio = rt_tos2priority(tos);
        struct netdev_nested_priv priv;

        /* If VLAN device, get it directly from the VLAN netdev */
        if (is_vlan_dev(ndev))
                return get_vlan_ndev_tc(ndev, prio);

        prio_tc_map.input_prio = prio;
        priv.data = (void *)&prio_tc_map;
        rcu_read_lock();
        netdev_walk_all_lower_dev_rcu(ndev,
                                      get_lower_vlan_dev_tc,
                                      &priv);
        rcu_read_unlock();
        /* If map is found from lower device, use it; Otherwise
         * continue with the current netdevice to get priority to tc map.
         */
        if (prio_tc_map.found)
                return prio_tc_map.output_tc;
        else if (ndev->num_tc)
                return netdev_get_prio_tc_map(ndev, prio);
        else
                return 0;
}

static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
{
        struct sockaddr_in6 *addr6;
        u16 dport, sport;
        u32 hash, fl;

        addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
        fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
        if ((cma_family(id_priv) != AF_INET6) || !fl) {
                dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
                sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
                hash = (u32)sport * 31 + dport;
                fl = hash & IB_GRH_FLOWLABEL_MASK;
        }

        return cpu_to_be32(fl);
}

static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
{
        struct rdma_route *route = &id_priv->id.route;
        struct rdma_addr *addr = &route->addr;
        struct cma_work *work;
        int ret;
        struct net_device *ndev;

        u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
                                        rdma_start_port(id_priv->cma_dev->device)];
        u8 tos;

        mutex_lock(&id_priv->qp_mutex);
        tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
        mutex_unlock(&id_priv->qp_mutex);

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        route->path_rec = kzalloc_obj(*route->path_rec);
        if (!route->path_rec) {
                ret = -ENOMEM;
                goto err1;
        }

        route->num_pri_alt_paths = 1;

        ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
        if (!ndev) {
                ret = -ENODEV;
                goto err2;
        }

        rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                    &route->path_rec->sgid);
        rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
                    &route->path_rec->dgid);

        if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
                /* TODO: get the hoplimit from the inet/inet6 device */
                route->path_rec->hop_limit = addr->dev_addr.hoplimit;
        else
                route->path_rec->hop_limit = 1;
        route->path_rec->reversible = 1;
        route->path_rec->pkey = cpu_to_be16(0xffff);
        route->path_rec->mtu_selector = IB_SA_EQ;
        route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
        route->path_rec->traffic_class = tos;
        route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
        route->path_rec->rate_selector = IB_SA_EQ;
        route->path_rec->rate = IB_RATE_PORT_CURRENT;
        dev_put(ndev);
        route->path_rec->packet_life_time_selector = IB_SA_EQ;
        /* In case ACK timeout is set, use this value to calculate
         * PacketLifeTime.  As per IBTA 12.7.34,
         * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
         * Assuming a negligible local ACK delay, we can use
         * PacketLifeTime = local ACK timeout/2
         * as a reasonable approximation for RoCE networks.
         */
        mutex_lock(&id_priv->qp_mutex);
        if (id_priv->timeout_set && id_priv->timeout)
                route->path_rec->packet_life_time = id_priv->timeout - 1;
        else
                route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
        mutex_unlock(&id_priv->qp_mutex);

        if (!route->path_rec->mtu) {
                ret = -EINVAL;
                goto err2;
        }

        if (rdma_protocol_roce_udp_encap(id_priv->id.device,
                                         id_priv->id.port_num))
                route->path_rec->flow_label =
                        cma_get_roce_udp_flow_label(id_priv);

        cma_init_resolve_route_work(work, id_priv);
        queue_work(cma_wq, &work->work);

        return 0;

err2:
        kfree(route->path_rec);
        route->path_rec = NULL;
        route->num_pri_alt_paths = 0;
err1:
        kfree(work);
        return ret;
}

int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
{
        struct rdma_id_private *id_priv;
        enum rdma_cm_state state;
        int ret;

        if (!timeout_ms)
                return -EINVAL;

        id_priv = container_of(id, struct rdma_id_private, id);
        state = id_priv->state;
        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
                           RDMA_CM_ROUTE_QUERY) &&
            !cma_comp_exch(id_priv, RDMA_CM_ADDRINFO_RESOLVED,
                           RDMA_CM_ROUTE_QUERY))
                return -EINVAL;

        cma_id_get(id_priv);
        if (rdma_cap_ib_sa(id->device, id->port_num))
                ret = cma_resolve_ib_route(id_priv, timeout_ms);
        else if (rdma_protocol_roce(id->device, id->port_num)) {
                ret = cma_resolve_iboe_route(id_priv);
                if (!ret)
                        cma_add_id_to_tree(id_priv);
        }
        else if (rdma_protocol_iwarp(id->device, id->port_num))
                ret = cma_resolve_iw_route(id_priv);
        else
                ret = -ENOSYS;

        if (ret)
                goto err;

        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, state);
        cma_id_put(id_priv);
        return ret;
}
EXPORT_SYMBOL(rdma_resolve_route);

static void cma_set_loopback(struct sockaddr *addr)
{
        switch (addr->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
                break;
        case AF_INET6:
                ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
                              0, 0, 0, htonl(1));
                break;
        default:
                ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
                            0, 0, 0, htonl(1));
                break;
        }
}

static int cma_bind_loopback(struct rdma_id_private *id_priv)
{
        struct cma_device *cma_dev, *cur_dev;
        union ib_gid gid;
        enum ib_port_state port_state;
        unsigned int p;
        u16 pkey;
        int ret;

        cma_dev = NULL;
        mutex_lock(&lock);
        list_for_each_entry(cur_dev, &dev_list, list) {
                if (cma_family(id_priv) == AF_IB &&
                    !rdma_cap_ib_cm(cur_dev->device, 1))
                        continue;

                if (!cma_dev)
                        cma_dev = cur_dev;

                rdma_for_each_port (cur_dev->device, p) {
                        if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
                            port_state == IB_PORT_ACTIVE) {
                                cma_dev = cur_dev;
                                goto port_found;
                        }
                }
        }

        if (!cma_dev) {
                ret = -ENODEV;
                goto out;
        }

        p = 1;

port_found:
        ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
        if (ret)
                goto out;

        ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
        if (ret)
                goto out;

        id_priv->id.route.addr.dev_addr.dev_type =
                (rdma_protocol_ib(cma_dev->device, p)) ?
                ARPHRD_INFINIBAND : ARPHRD_ETHER;

        rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
        ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
        id_priv->id.port_num = p;
        cma_attach_to_dev(id_priv, cma_dev);
        rdma_restrack_add(&id_priv->res);
        cma_set_loopback(cma_src_addr(id_priv));
out:
        mutex_unlock(&lock);
        return ret;
}

static void addr_handler(int status, struct sockaddr *src_addr,
                         struct rdma_dev_addr *dev_addr, void *context)
{
        struct rdma_id_private *id_priv = context;
        struct rdma_cm_event event = {};
        struct sockaddr *addr;
        struct sockaddr_storage old_addr;

        mutex_lock(&id_priv->handler_mutex);
        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
                           RDMA_CM_ADDR_RESOLVED))
                goto out;

        /*
         * Store the previous src address, so that if we fail to acquire
         * matching rdma device, old address can be restored back, which helps
         * to cancel the cma listen operation correctly.
         */
        addr = cma_src_addr(id_priv);
        memcpy(&old_addr, addr, rdma_addr_size(addr));
        memcpy(addr, src_addr, rdma_addr_size(src_addr));
        if (!status && !id_priv->cma_dev) {
                status = cma_acquire_dev_by_src_ip(id_priv);
                if (status)
                        pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
                                             status);
                rdma_restrack_add(&id_priv->res);
        } else if (status) {
                pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
        }

        if (status) {
                memcpy(addr, &old_addr,
                       rdma_addr_size((struct sockaddr *)&old_addr));
                if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
                                   RDMA_CM_ADDR_BOUND))
                        goto out;
                event.event = RDMA_CM_EVENT_ADDR_ERROR;
                event.status = status;
        } else
                event.event = RDMA_CM_EVENT_ADDR_RESOLVED;

        if (cma_cm_event_handler(id_priv, &event)) {
                destroy_id_handler_unlock(id_priv);
                return;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
}

static int cma_resolve_loopback(struct rdma_id_private *id_priv)
{
        struct cma_work *work;
        union ib_gid gid;
        int ret;

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        if (!id_priv->cma_dev) {
                ret = cma_bind_loopback(id_priv);
                if (ret)
                        goto err;
        }

        rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
        rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);

        enqueue_resolve_addr_work(work, id_priv);
        return 0;
err:
        kfree(work);
        return ret;
}

static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
{
        struct cma_work *work;
        int ret;

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        if (!id_priv->cma_dev) {
                ret = cma_resolve_ib_dev(id_priv);
                if (ret)
                        goto err;
        }

        rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
                &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));

        enqueue_resolve_addr_work(work, id_priv);
        return 0;
err:
        kfree(work);
        return ret;
}

int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
{
        struct rdma_id_private *id_priv;
        unsigned long flags;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        spin_lock_irqsave(&id_priv->lock, flags);
        if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
            id_priv->state == RDMA_CM_IDLE) {
                id_priv->reuseaddr = reuse;
                ret = 0;
        } else {
                ret = -EINVAL;
        }
        spin_unlock_irqrestore(&id_priv->lock, flags);
        return ret;
}
EXPORT_SYMBOL(rdma_set_reuseaddr);

int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
{
        struct rdma_id_private *id_priv;
        unsigned long flags;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        spin_lock_irqsave(&id_priv->lock, flags);
        if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
                id_priv->options |= (1 << CMA_OPTION_AFONLY);
                id_priv->afonly = afonly;
                ret = 0;
        } else {
                ret = -EINVAL;
        }
        spin_unlock_irqrestore(&id_priv->lock, flags);
        return ret;
}
EXPORT_SYMBOL(rdma_set_afonly);

static void cma_bind_port(struct rdma_bind_list *bind_list,
                          struct rdma_id_private *id_priv)
{
        struct sockaddr *addr;
        struct sockaddr_ib *sib;
        u64 sid, mask;
        __be16 port;

        lockdep_assert_held(&lock);

        addr = cma_src_addr(id_priv);
        port = htons(bind_list->port);

        switch (addr->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *) addr)->sin_port = port;
                break;
        case AF_INET6:
                ((struct sockaddr_in6 *) addr)->sin6_port = port;
                break;
        case AF_IB:
                sib = (struct sockaddr_ib *) addr;
                sid = be64_to_cpu(sib->sib_sid);
                mask = be64_to_cpu(sib->sib_sid_mask);
                sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
                sib->sib_sid_mask = cpu_to_be64(~0ULL);
                break;
        }
        id_priv->bind_list = bind_list;
        hlist_add_head(&id_priv->node, &bind_list->owners);
}

static int cma_alloc_port(enum rdma_ucm_port_space ps,
                          struct rdma_id_private *id_priv, unsigned short snum)
{
        struct rdma_bind_list *bind_list;
        int ret;

        lockdep_assert_held(&lock);

        bind_list = kzalloc_obj(*bind_list);
        if (!bind_list)
                return -ENOMEM;

        ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
                           snum);
        if (ret < 0)
                goto err;

        bind_list->ps = ps;
        bind_list->port = snum;
        cma_bind_port(bind_list, id_priv);
        return 0;
err:
        kfree(bind_list);
        return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
}

static int cma_port_is_unique(struct rdma_bind_list *bind_list,
                              struct rdma_id_private *id_priv)
{
        struct rdma_id_private *cur_id;
        struct sockaddr  *daddr = cma_dst_addr(id_priv);
        struct sockaddr  *saddr = cma_src_addr(id_priv);
        __be16 dport = cma_port(daddr);

        lockdep_assert_held(&lock);

        hlist_for_each_entry(cur_id, &bind_list->owners, node) {
                struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
                struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
                __be16 cur_dport = cma_port(cur_daddr);

                if (id_priv == cur_id)
                        continue;

                /* different dest port -> unique */
                if (!cma_any_port(daddr) &&
                    !cma_any_port(cur_daddr) &&
                    (dport != cur_dport))
                        continue;

                /* different src address -> unique */
                if (!cma_any_addr(saddr) &&
                    !cma_any_addr(cur_saddr) &&
                    cma_addr_cmp(saddr, cur_saddr))
                        continue;

                /* different dst address -> unique */
                if (!cma_any_addr(daddr) &&
                    !cma_any_addr(cur_daddr) &&
                    cma_addr_cmp(daddr, cur_daddr))
                        continue;

                return -EADDRNOTAVAIL;
        }
        return 0;
}

static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
                              struct rdma_id_private *id_priv)
{
        static unsigned int last_used_port;
        int low, high, remaining;
        unsigned int rover;
        struct net *net = id_priv->id.route.addr.dev_addr.net;

        lockdep_assert_held(&lock);

        inet_get_local_port_range(net, &low, &high);
        remaining = (high - low) + 1;
        rover = get_random_u32_inclusive(low, remaining + low - 1);
retry:
        if (last_used_port != rover) {
                struct rdma_bind_list *bind_list;
                int ret;

                bind_list = cma_ps_find(net, ps, (unsigned short)rover);

                if (!bind_list) {
                        ret = cma_alloc_port(ps, id_priv, rover);
                } else {
                        ret = cma_port_is_unique(bind_list, id_priv);
                        if (!ret)
                                cma_bind_port(bind_list, id_priv);
                }
                /*
                 * Remember previously used port number in order to avoid
                 * re-using same port immediately after it is closed.
                 */
                if (!ret)
                        last_used_port = rover;
                if (ret != -EADDRNOTAVAIL)
                        return ret;
        }
        if (--remaining) {
                rover++;
                if ((rover < low) || (rover > high))
                        rover = low;
                goto retry;
        }
        return -EADDRNOTAVAIL;
}

/*
 * Check that the requested port is available.  This is called when trying to
 * bind to a specific port, or when trying to listen on a bound port.  In
 * the latter case, the provided id_priv may already be on the bind_list, but
 * we still need to check that it's okay to start listening.
 */
static int cma_check_port(struct rdma_bind_list *bind_list,
                          struct rdma_id_private *id_priv, uint8_t reuseaddr)
{
        struct rdma_id_private *cur_id;
        struct sockaddr *addr, *cur_addr;

        lockdep_assert_held(&lock);

        addr = cma_src_addr(id_priv);
        hlist_for_each_entry(cur_id, &bind_list->owners, node) {
                if (id_priv == cur_id)
                        continue;

                if (reuseaddr && cur_id->reuseaddr)
                        continue;

                cur_addr = cma_src_addr(cur_id);
                if (id_priv->afonly && cur_id->afonly &&
                    (addr->sa_family != cur_addr->sa_family))
                        continue;

                if (cma_any_addr(addr) || cma_any_addr(cur_addr))
                        return -EADDRNOTAVAIL;

                if (!cma_addr_cmp(addr, cur_addr))
                        return -EADDRINUSE;
        }
        return 0;
}

static int cma_use_port(enum rdma_ucm_port_space ps,
                        struct rdma_id_private *id_priv)
{
        struct rdma_bind_list *bind_list;
        unsigned short snum;
        int ret;

        lockdep_assert_held(&lock);

        snum = ntohs(cma_port(cma_src_addr(id_priv)));
        if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
                return -EACCES;

        bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
        if (!bind_list) {
                ret = cma_alloc_port(ps, id_priv, snum);
        } else {
                ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
                if (!ret)
                        cma_bind_port(bind_list, id_priv);
        }
        return ret;
}

static enum rdma_ucm_port_space
cma_select_inet_ps(struct rdma_id_private *id_priv)
{
        switch (id_priv->id.ps) {
        case RDMA_PS_TCP:
        case RDMA_PS_UDP:
        case RDMA_PS_IPOIB:
        case RDMA_PS_IB:
                return id_priv->id.ps;
        default:

                return 0;
        }
}

static enum rdma_ucm_port_space
cma_select_ib_ps(struct rdma_id_private *id_priv)
{
        enum rdma_ucm_port_space ps = 0;
        struct sockaddr_ib *sib;
        u64 sid_ps, mask, sid;

        sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
        mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
        sid = be64_to_cpu(sib->sib_sid) & mask;

        if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
                sid_ps = RDMA_IB_IP_PS_IB;
                ps = RDMA_PS_IB;
        } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
                   (sid == (RDMA_IB_IP_PS_TCP & mask))) {
                sid_ps = RDMA_IB_IP_PS_TCP;
                ps = RDMA_PS_TCP;
        } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
                   (sid == (RDMA_IB_IP_PS_UDP & mask))) {
                sid_ps = RDMA_IB_IP_PS_UDP;
                ps = RDMA_PS_UDP;
        }

        if (ps) {
                sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
                sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
                                                be64_to_cpu(sib->sib_sid_mask));
        }
        return ps;
}

static int cma_get_port(struct rdma_id_private *id_priv)
{
        enum rdma_ucm_port_space ps;
        int ret;

        if (cma_family(id_priv) != AF_IB)
                ps = cma_select_inet_ps(id_priv);
        else
                ps = cma_select_ib_ps(id_priv);
        if (!ps)
                return -EPROTONOSUPPORT;

        mutex_lock(&lock);
        if (cma_any_port(cma_src_addr(id_priv)))
                ret = cma_alloc_any_port(ps, id_priv);
        else
                ret = cma_use_port(ps, id_priv);
        mutex_unlock(&lock);

        return ret;
}

static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
                               struct sockaddr *addr)
{
#if IS_ENABLED(CONFIG_IPV6)
        struct sockaddr_in6 *sin6;

        if (addr->sa_family != AF_INET6)
                return 0;

        sin6 = (struct sockaddr_in6 *) addr;

        if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
                return 0;

        if (!sin6->sin6_scope_id)
                        return -EINVAL;

        dev_addr->bound_dev_if = sin6->sin6_scope_id;
#endif
        return 0;
}

int rdma_listen(struct rdma_cm_id *id, int backlog)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret;

        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
                struct sockaddr_in any_in = {
                        .sin_family = AF_INET,
                        .sin_addr.s_addr = htonl(INADDR_ANY),
                };

                /* For a well behaved ULP state will be RDMA_CM_IDLE */
                ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
                if (ret)
                        return ret;
                if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
                                           RDMA_CM_LISTEN)))
                        return -EINVAL;
        }

        /*
         * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
         * any more, and has to be unique in the bind list.
         */
        if (id_priv->reuseaddr) {
                mutex_lock(&lock);
                ret = cma_check_port(id_priv->bind_list, id_priv, 0);
                if (!ret)
                        id_priv->reuseaddr = 0;
                mutex_unlock(&lock);
                if (ret)
                        goto err;
        }

        id_priv->backlog = backlog;
        if (id_priv->cma_dev) {
                if (rdma_cap_ib_cm(id->device, 1)) {
                        ret = cma_ib_listen(id_priv);
                        if (ret)
                                goto err;
                } else if (rdma_cap_iw_cm(id->device, 1)) {
                        ret = cma_iw_listen(id_priv, backlog);
                        if (ret)
                                goto err;
                } else {
                        ret = -ENOSYS;
                        goto err;
                }
        } else {
                ret = cma_listen_on_all(id_priv);
                if (ret)
                        goto err;
        }

        return 0;
err:
        id_priv->backlog = 0;
        /*
         * All the failure paths that lead here will not allow the req_handler's
         * to have run.
         */
        cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
        return ret;
}
EXPORT_SYMBOL(rdma_listen);

static int rdma_bind_addr_dst(struct rdma_id_private *id_priv,
                              struct sockaddr *addr, const struct sockaddr *daddr)
{
        struct sockaddr *id_daddr;
        int ret;

        if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
            addr->sa_family != AF_IB)
                return -EAFNOSUPPORT;

        if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
                return -EINVAL;

        ret = cma_check_linklocal(&id_priv->id.route.addr.dev_addr, addr);
        if (ret)
                goto err1;

        memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
        if (!cma_any_addr(addr)) {
                ret = cma_translate_addr(addr, &id_priv->id.route.addr.dev_addr);
                if (ret)
                        goto err1;

                ret = cma_acquire_dev_by_src_ip(id_priv);
                if (ret)
                        goto err1;
        }

        if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
                if (addr->sa_family == AF_INET)
                        id_priv->afonly = 1;
#if IS_ENABLED(CONFIG_IPV6)
                else if (addr->sa_family == AF_INET6) {
                        struct net *net = id_priv->id.route.addr.dev_addr.net;

                        id_priv->afonly = net->ipv6.sysctl.bindv6only;
                }
#endif
        }
        id_daddr = cma_dst_addr(id_priv);
        if (daddr != id_daddr)
                memcpy(id_daddr, daddr, rdma_addr_size(addr));
        id_daddr->sa_family = addr->sa_family;

        ret = cma_get_port(id_priv);
        if (ret)
                goto err2;

        if (!cma_any_addr(addr))
                rdma_restrack_add(&id_priv->res);
        return 0;
err2:
        if (id_priv->cma_dev)
                cma_release_dev(id_priv);
err1:
        cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
        return ret;
}

static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                         const struct sockaddr *dst_addr)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        struct sockaddr_storage zero_sock = {};

        if (src_addr && src_addr->sa_family)
                return rdma_bind_addr_dst(id_priv, src_addr, dst_addr);

        /*
         * When the src_addr is not specified, automatically supply an any addr
         */
        zero_sock.ss_family = dst_addr->sa_family;
        if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
                struct sockaddr_in6 *src_addr6 =
                        (struct sockaddr_in6 *)&zero_sock;
                struct sockaddr_in6 *dst_addr6 =
                        (struct sockaddr_in6 *)dst_addr;

                src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
                if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
                        id->route.addr.dev_addr.bound_dev_if =
                                dst_addr6->sin6_scope_id;
        } else if (dst_addr->sa_family == AF_IB) {
                ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
                        ((struct sockaddr_ib *)dst_addr)->sib_pkey;
        }
        return rdma_bind_addr_dst(id_priv, (struct sockaddr *)&zero_sock, dst_addr);
}

/*
 * If required, resolve the source address for bind and leave the id_priv in
 * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
 * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
 * ignored.
 */
static int resolve_prepare_src(struct rdma_id_private *id_priv,
                               struct sockaddr *src_addr,
                               const struct sockaddr *dst_addr)
{
        int ret;

        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
                /* For a well behaved ULP state will be RDMA_CM_IDLE */
                ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
                if (ret)
                        return ret;
                if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
                                           RDMA_CM_ADDR_QUERY)))
                        return -EINVAL;

        } else {
                memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
        }

        if (cma_family(id_priv) != dst_addr->sa_family) {
                ret = -EINVAL;
                goto err_state;
        }
        return 0;

err_state:
        cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
        return ret;
}

int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                      const struct sockaddr *dst_addr, unsigned long timeout_ms)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret;

        ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
        if (ret)
                return ret;

        if (cma_any_addr(dst_addr)) {
                ret = cma_resolve_loopback(id_priv);
        } else {
                if (dst_addr->sa_family == AF_IB) {
                        ret = cma_resolve_ib_addr(id_priv);
                } else {
                        /*
                         * The FSM can return back to RDMA_CM_ADDR_BOUND after
                         * rdma_resolve_ip() is called, eg through the error
                         * path in addr_handler(). If this happens the existing
                         * request must be canceled before issuing a new one.
                         * Since canceling a request is a bit slow and this
                         * oddball path is rare, keep track once a request has
                         * been issued. The track turns out to be a permanent
                         * state since this is the only cancel as it is
                         * immediately before rdma_resolve_ip().
                         */
                        if (id_priv->used_resolve_ip)
                                rdma_addr_cancel(&id->route.addr.dev_addr);
                        else
                                id_priv->used_resolve_ip = 1;
                        ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
                                              &id->route.addr.dev_addr,
                                              timeout_ms, addr_handler,
                                              false, id_priv);
                }
        }
        if (ret)
                goto err;

        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
        return ret;
}
EXPORT_SYMBOL(rdma_resolve_addr);

int rdma_restrict_node_type(struct rdma_cm_id *id, u8 node_type)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret = 0;

        switch (node_type) {
        case RDMA_NODE_UNSPECIFIED:
        case RDMA_NODE_IB_CA:
        case RDMA_NODE_RNIC:
                break;
        default:
                return -EINVAL;
        }

        mutex_lock(&lock);
        if (READ_ONCE(id_priv->state) != RDMA_CM_IDLE)
                ret = -EALREADY;
        else
                id_priv->restricted_node_type = node_type;
        mutex_unlock(&lock);

        return ret;
}
EXPORT_SYMBOL(rdma_restrict_node_type);

int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        return rdma_bind_addr_dst(id_priv, addr, cma_dst_addr(id_priv));
}
EXPORT_SYMBOL(rdma_bind_addr);

static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
{
        struct cma_hdr *cma_hdr;

        cma_hdr = hdr;
        cma_hdr->cma_version = CMA_VERSION;
        if (cma_family(id_priv) == AF_INET) {
                struct sockaddr_in *src4, *dst4;

                src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
                dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);

                cma_set_ip_ver(cma_hdr, 4);
                cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
                cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
                cma_hdr->port = src4->sin_port;
        } else if (cma_family(id_priv) == AF_INET6) {
                struct sockaddr_in6 *src6, *dst6;

                src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
                dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);

                cma_set_ip_ver(cma_hdr, 6);
                cma_hdr->src_addr.ip6 = src6->sin6_addr;
                cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
                cma_hdr->port = src6->sin6_port;
        }
        return 0;
}

static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
                                const struct ib_cm_event *ib_event)
{
        struct rdma_id_private *id_priv = cm_id->context;
        struct rdma_cm_event event = {};
        const struct ib_cm_sidr_rep_event_param *rep =
                                &ib_event->param.sidr_rep_rcvd;
        int ret;

        mutex_lock(&id_priv->handler_mutex);
        if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
                goto out;

        switch (ib_event->event) {
        case IB_CM_SIDR_REQ_ERROR:
                event.event = RDMA_CM_EVENT_UNREACHABLE;
                event.status = -ETIMEDOUT;
                break;
        case IB_CM_SIDR_REP_RECEIVED:
                event.param.ud.private_data = ib_event->private_data;
                event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
                if (rep->status != IB_SIDR_SUCCESS) {
                        event.event = RDMA_CM_EVENT_UNREACHABLE;
                        event.status = ib_event->param.sidr_rep_rcvd.status;
                        pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
                                             event.status);
                        break;
                }
                ret = cma_set_qkey(id_priv, rep->qkey);
                if (ret) {
                        pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
                        event.event = RDMA_CM_EVENT_ADDR_ERROR;
                        event.status = ret;
                        break;
                }
                ib_init_ah_attr_from_path(id_priv->id.device,
                                          id_priv->id.port_num,
                                          id_priv->id.route.path_rec,
                                          &event.param.ud.ah_attr,
                                          rep->sgid_attr);
                event.param.ud.qp_num = rep->qpn;
                event.param.ud.qkey = rep->qkey;
                event.event = RDMA_CM_EVENT_ESTABLISHED;
                event.status = 0;
                break;
        default:
                pr_err("RDMA CMA: unexpected IB CM event: %d\n",
                       ib_event->event);
                goto out;
        }

        ret = cma_cm_event_handler(id_priv, &event);

        rdma_destroy_ah_attr(&event.param.ud.ah_attr);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                destroy_id_handler_unlock(id_priv);
                return ret;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        return 0;
}

static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
                              struct rdma_conn_param *conn_param)
{
        struct ib_cm_sidr_req_param req;
        struct ib_cm_id *id;
        void *private_data;
        u8 offset;
        int ret;

        memset(&req, 0, sizeof req);
        offset = cma_user_data_offset(id_priv);
        if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
                return -EINVAL;

        if (req.private_data_len) {
                private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
                if (!private_data)
                        return -ENOMEM;
        } else {
                private_data = NULL;
        }

        if (conn_param->private_data && conn_param->private_data_len)
                memcpy(private_data + offset, conn_param->private_data,
                       conn_param->private_data_len);

        if (private_data) {
                ret = cma_format_hdr(private_data, id_priv);
                if (ret)
                        goto out;
                req.private_data = private_data;
        }

        id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
                             id_priv);
        if (IS_ERR(id)) {
                ret = PTR_ERR(id);
                goto out;
        }
        id_priv->cm_id.ib = id;

        req.path = id_priv->id.route.path_rec;
        req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
        req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
        req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
        req.max_cm_retries = CMA_MAX_CM_RETRIES;

        trace_cm_send_sidr_req(id_priv);
        ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
        if (ret) {
                ib_destroy_cm_id(id_priv->cm_id.ib);
                id_priv->cm_id.ib = NULL;
        }
out:
        kfree(private_data);
        return ret;
}

static int cma_connect_ib(struct rdma_id_private *id_priv,
                          struct rdma_conn_param *conn_param)
{
        struct ib_cm_req_param req;
        struct rdma_route *route;
        void *private_data;
        struct ib_cm_id *id;
        u8 offset;
        int ret;

        memset(&req, 0, sizeof req);
        offset = cma_user_data_offset(id_priv);
        if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
                return -EINVAL;

        if (req.private_data_len) {
                private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
                if (!private_data)
                        return -ENOMEM;
        } else {
                private_data = NULL;
        }

        if (conn_param->private_data && conn_param->private_data_len)
                memcpy(private_data + offset, conn_param->private_data,
                       conn_param->private_data_len);

        id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
        if (IS_ERR(id)) {
                ret = PTR_ERR(id);
                goto out;
        }
        id_priv->cm_id.ib = id;

        route = &id_priv->id.route;
        if (private_data) {
                ret = cma_format_hdr(private_data, id_priv);
                if (ret)
                        goto out;
                req.private_data = private_data;
        }

        req.primary_path = &route->path_rec[0];
        req.primary_path_inbound = route->path_rec_inbound;
        req.primary_path_outbound = route->path_rec_outbound;
        if (route->num_pri_alt_paths == 2)
                req.alternate_path = &route->path_rec[1];

        req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
        /* Alternate path SGID attribute currently unsupported */
        req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
        req.qp_num = id_priv->qp_num;
        req.qp_type = id_priv->id.qp_type;
        req.starting_psn = id_priv->seq_num;
        req.responder_resources = conn_param->responder_resources;
        req.initiator_depth = conn_param->initiator_depth;
        req.flow_control = conn_param->flow_control;
        req.retry_count = min_t(u8, 7, conn_param->retry_count);
        req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
        req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
        req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
        req.max_cm_retries = CMA_MAX_CM_RETRIES;
        req.srq = id_priv->srq ? 1 : 0;
        req.ece.vendor_id = id_priv->ece.vendor_id;
        req.ece.attr_mod = id_priv->ece.attr_mod;

        trace_cm_send_req(id_priv);
        ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
out:
        if (ret && !IS_ERR(id)) {
                ib_destroy_cm_id(id);
                id_priv->cm_id.ib = NULL;
        }

        kfree(private_data);
        return ret;
}

static int cma_connect_iw(struct rdma_id_private *id_priv,
                          struct rdma_conn_param *conn_param)
{
        struct iw_cm_id *cm_id;
        int ret;
        struct iw_cm_conn_param iw_param;

        cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
        if (IS_ERR(cm_id))
                return PTR_ERR(cm_id);

        mutex_lock(&id_priv->qp_mutex);
        cm_id->tos = id_priv->tos;
        cm_id->tos_set = id_priv->tos_set;
        mutex_unlock(&id_priv->qp_mutex);

        id_priv->cm_id.iw = cm_id;

        memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
               rdma_addr_size(cma_src_addr(id_priv)));
        memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
               rdma_addr_size(cma_dst_addr(id_priv)));

        ret = cma_modify_qp_rtr(id_priv, conn_param);
        if (ret)
                goto out;

        if (conn_param) {
                iw_param.ord = conn_param->initiator_depth;
                iw_param.ird = conn_param->responder_resources;
                iw_param.private_data = conn_param->private_data;
                iw_param.private_data_len = conn_param->private_data_len;
                iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
        } else {
                memset(&iw_param, 0, sizeof iw_param);
                iw_param.qpn = id_priv->qp_num;
        }
        ret = iw_cm_connect(cm_id, &iw_param);
out:
        if (ret) {
                iw_destroy_cm_id(cm_id);
                id_priv->cm_id.iw = NULL;
        }
        return ret;
}

/**
 * rdma_connect_locked - Initiate an active connection request.
 * @id: Connection identifier to connect.
 * @conn_param: Connection information used for connected QPs.
 *
 * Same as rdma_connect() but can only be called from the
 * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
 */
int rdma_connect_locked(struct rdma_cm_id *id,
                        struct rdma_conn_param *conn_param)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret;

        lockdep_assert_held(&id_priv->handler_mutex);

        if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
                return -EINVAL;

        if (!id->qp) {
                id_priv->qp_num = conn_param->qp_num;
                id_priv->srq = conn_param->srq;
        }

        if (rdma_cap_ib_cm(id->device, id->port_num)) {
                if (id->qp_type == IB_QPT_UD)
                        ret = cma_resolve_ib_udp(id_priv, conn_param);
                else
                        ret = cma_connect_ib(id_priv, conn_param);
        } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
                ret = cma_connect_iw(id_priv, conn_param);
        } else {
                ret = -ENOSYS;
        }
        if (ret)
                goto err_state;
        return 0;
err_state:
        cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
        return ret;
}
EXPORT_SYMBOL(rdma_connect_locked);

/**
 * rdma_connect - Initiate an active connection request.
 * @id: Connection identifier to connect.
 * @conn_param: Connection information used for connected QPs.
 *
 * Users must have resolved a route for the rdma_cm_id to connect with by having
 * called rdma_resolve_route before calling this routine.
 *
 * This call will either connect to a remote QP or obtain remote QP information
 * for unconnected rdma_cm_id's.  The actual operation is based on the
 * rdma_cm_id's port space.
 */
int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret;

        mutex_lock(&id_priv->handler_mutex);
        ret = rdma_connect_locked(id, conn_param);
        mutex_unlock(&id_priv->handler_mutex);
        return ret;
}
EXPORT_SYMBOL(rdma_connect);

/**
 * rdma_connect_ece - Initiate an active connection request with ECE data.
 * @id: Connection identifier to connect.
 * @conn_param: Connection information used for connected QPs.
 * @ece: ECE parameters
 *
 * See rdma_connect() explanation.
 */
int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
                     struct rdma_ucm_ece *ece)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        id_priv->ece.vendor_id = ece->vendor_id;
        id_priv->ece.attr_mod = ece->attr_mod;

        return rdma_connect(id, conn_param);
}
EXPORT_SYMBOL(rdma_connect_ece);

static int cma_accept_ib(struct rdma_id_private *id_priv,
                         struct rdma_conn_param *conn_param)
{
        struct ib_cm_rep_param rep;
        int ret;

        ret = cma_modify_qp_rtr(id_priv, conn_param);
        if (ret)
                goto out;

        ret = cma_modify_qp_rts(id_priv, conn_param);
        if (ret)
                goto out;

        memset(&rep, 0, sizeof rep);
        rep.qp_num = id_priv->qp_num;
        rep.starting_psn = id_priv->seq_num;
        rep.private_data = conn_param->private_data;
        rep.private_data_len = conn_param->private_data_len;
        rep.responder_resources = conn_param->responder_resources;
        rep.initiator_depth = conn_param->initiator_depth;
        rep.failover_accepted = 0;
        rep.flow_control = conn_param->flow_control;
        rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
        rep.srq = id_priv->srq ? 1 : 0;
        rep.ece.vendor_id = id_priv->ece.vendor_id;
        rep.ece.attr_mod = id_priv->ece.attr_mod;

        trace_cm_send_rep(id_priv);
        ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
out:
        return ret;
}

static int cma_accept_iw(struct rdma_id_private *id_priv,
                  struct rdma_conn_param *conn_param)
{
        struct iw_cm_conn_param iw_param;
        int ret;

        if (!conn_param)
                return -EINVAL;

        ret = cma_modify_qp_rtr(id_priv, conn_param);
        if (ret)
                return ret;

        iw_param.ord = conn_param->initiator_depth;
        iw_param.ird = conn_param->responder_resources;
        iw_param.private_data = conn_param->private_data;
        iw_param.private_data_len = conn_param->private_data_len;
        if (id_priv->id.qp)
                iw_param.qpn = id_priv->qp_num;
        else
                iw_param.qpn = conn_param->qp_num;

        return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
}

static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
                             enum ib_cm_sidr_status status, u32 qkey,
                             const void *private_data, int private_data_len)
{
        struct ib_cm_sidr_rep_param rep;
        int ret;

        memset(&rep, 0, sizeof rep);
        rep.status = status;
        if (status == IB_SIDR_SUCCESS) {
                if (qkey)
                        ret = cma_set_qkey(id_priv, qkey);
                else
                        ret = cma_set_default_qkey(id_priv);
                if (ret)
                        return ret;
                rep.qp_num = id_priv->qp_num;
                rep.qkey = id_priv->qkey;

                rep.ece.vendor_id = id_priv->ece.vendor_id;
                rep.ece.attr_mod = id_priv->ece.attr_mod;
        }

        rep.private_data = private_data;
        rep.private_data_len = private_data_len;

        trace_cm_send_sidr_rep(id_priv);
        return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
}

/**
 * rdma_accept - Called to accept a connection request or response.
 * @id: Connection identifier associated with the request.
 * @conn_param: Information needed to establish the connection.  This must be
 *   provided if accepting a connection request.  If accepting a connection
 *   response, this parameter must be NULL.
 *
 * Typically, this routine is only called by the listener to accept a connection
 * request.  It must also be called on the active side of a connection if the
 * user is performing their own QP transitions.
 *
 * In the case of error, a reject message is sent to the remote side and the
 * state of the qp associated with the id is modified to error, such that any
 * previously posted receive buffers would be flushed.
 *
 * This function is for use by kernel ULPs and must be called from under the
 * handler callback.
 */
int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        int ret;

        lockdep_assert_held(&id_priv->handler_mutex);

        if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
                return -EINVAL;

        if (!id->qp && conn_param) {
                id_priv->qp_num = conn_param->qp_num;
                id_priv->srq = conn_param->srq;
        }

        if (rdma_cap_ib_cm(id->device, id->port_num)) {
                if (id->qp_type == IB_QPT_UD) {
                        if (conn_param)
                                ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
                                                        conn_param->qkey,
                                                        conn_param->private_data,
                                                        conn_param->private_data_len);
                        else
                                ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
                                                        0, NULL, 0);
                } else {
                        if (conn_param)
                                ret = cma_accept_ib(id_priv, conn_param);
                        else
                                ret = cma_rep_recv(id_priv);
                }
        } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
                ret = cma_accept_iw(id_priv, conn_param);
        } else {
                ret = -ENOSYS;
        }
        if (ret)
                goto reject;

        return 0;
reject:
        cma_modify_qp_err(id_priv);
        rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
        return ret;
}
EXPORT_SYMBOL(rdma_accept);

int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
                    struct rdma_ucm_ece *ece)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        id_priv->ece.vendor_id = ece->vendor_id;
        id_priv->ece.attr_mod = ece->attr_mod;

        return rdma_accept(id, conn_param);
}
EXPORT_SYMBOL(rdma_accept_ece);

void rdma_lock_handler(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        mutex_lock(&id_priv->handler_mutex);
}
EXPORT_SYMBOL(rdma_lock_handler);

void rdma_unlock_handler(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);

        mutex_unlock(&id_priv->handler_mutex);
}
EXPORT_SYMBOL(rdma_unlock_handler);

int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!id_priv->cm_id.ib)
                return -EINVAL;

        switch (id->device->node_type) {
        case RDMA_NODE_IB_CA:
                ret = ib_cm_notify(id_priv->cm_id.ib, event);
                break;
        default:
                ret = 0;
                break;
        }
        return ret;
}
EXPORT_SYMBOL(rdma_notify);

int rdma_reject(struct rdma_cm_id *id, const void *private_data,
                u8 private_data_len, u8 reason)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!id_priv->cm_id.ib)
                return -EINVAL;

        if (rdma_cap_ib_cm(id->device, id->port_num)) {
                if (id->qp_type == IB_QPT_UD) {
                        ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
                                                private_data, private_data_len);
                } else {
                        trace_cm_send_rej(id_priv);
                        ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
                                             private_data, private_data_len);
                }
        } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
                ret = iw_cm_reject(id_priv->cm_id.iw,
                                   private_data, private_data_len);
        } else {
                ret = -ENOSYS;
        }

        return ret;
}
EXPORT_SYMBOL(rdma_reject);

int rdma_disconnect(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!id_priv->cm_id.ib)
                return -EINVAL;

        if (rdma_cap_ib_cm(id->device, id->port_num)) {
                ret = cma_modify_qp_err(id_priv);
                if (ret)
                        goto out;
                /* Initiate or respond to a disconnect. */
                trace_cm_disconnect(id_priv);
                if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
                        if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
                                trace_cm_sent_drep(id_priv);
                } else {
                        trace_cm_sent_dreq(id_priv);
                }
        } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
                ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
        } else
                ret = -EINVAL;

out:
        return ret;
}
EXPORT_SYMBOL(rdma_disconnect);

static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
                              struct ib_sa_multicast *multicast,
                              struct rdma_cm_event *event,
                              struct cma_multicast *mc)
{
        struct rdma_dev_addr *dev_addr;
        enum ib_gid_type gid_type;
        struct net_device *ndev;

        if (status)
                pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
                                     status);

        event->status = status;
        event->param.ud.private_data = mc->context;
        if (status) {
                event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
                return;
        }

        dev_addr = &id_priv->id.route.addr.dev_addr;
        ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
        gid_type =
                id_priv->cma_dev
                        ->default_gid_type[id_priv->id.port_num -
                                           rdma_start_port(
                                                   id_priv->cma_dev->device)];

        event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
        if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
                                     &multicast->rec, ndev, gid_type,
                                     &event->param.ud.ah_attr)) {
                event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
                goto out;
        }

        event->param.ud.qp_num = 0xFFFFFF;
        event->param.ud.qkey = id_priv->qkey;

out:
        dev_put(ndev);
}

static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
{
        struct cma_multicast *mc = multicast->context;
        struct rdma_id_private *id_priv = mc->id_priv;
        struct rdma_cm_event event = {};
        int ret = 0;

        mutex_lock(&id_priv->handler_mutex);
        if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
            READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
                goto out;

        ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
        if (!ret) {
                cma_make_mc_event(status, id_priv, multicast, &event, mc);
                ret = cma_cm_event_handler(id_priv, &event);
        }
        rdma_destroy_ah_attr(&event.param.ud.ah_attr);
        WARN_ON(ret);

out:
        mutex_unlock(&id_priv->handler_mutex);
        return 0;
}

static void cma_set_mgid(struct rdma_id_private *id_priv,
                         struct sockaddr *addr, union ib_gid *mgid)
{
        unsigned char mc_map[MAX_ADDR_LEN];
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        struct sockaddr_in *sin = (struct sockaddr_in *) addr;
        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;

        if (cma_any_addr(addr)) {
                memset(mgid, 0, sizeof *mgid);
        } else if ((addr->sa_family == AF_INET6) &&
                   ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
                                                                 0xFF10A01B)) {
                /* IPv6 address is an SA assigned MGID. */
                memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
        } else if (addr->sa_family == AF_IB) {
                memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
        } else if (addr->sa_family == AF_INET6) {
                ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
                if (id_priv->id.ps == RDMA_PS_UDP)
                        mc_map[7] = 0x01;       /* Use RDMA CM signature */
                *mgid = *(union ib_gid *) (mc_map + 4);
        } else {
                ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
                if (id_priv->id.ps == RDMA_PS_UDP)
                        mc_map[7] = 0x01;       /* Use RDMA CM signature */
                *mgid = *(union ib_gid *) (mc_map + 4);
        }
}

static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
                                 struct cma_multicast *mc)
{
        struct ib_sa_mcmember_rec rec;
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        ib_sa_comp_mask comp_mask;
        int ret;

        ib_addr_get_mgid(dev_addr, &rec.mgid);
        ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
                                     &rec.mgid, &rec);
        if (ret)
                return ret;

        if (!id_priv->qkey) {
                ret = cma_set_default_qkey(id_priv);
                if (ret)
                        return ret;
        }

        cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
        rec.qkey = cpu_to_be32(id_priv->qkey);
        rdma_addr_get_sgid(dev_addr, &rec.port_gid);
        rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
        rec.join_state = mc->join_state;

        comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
                    IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
                    IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
                    IB_SA_MCMEMBER_REC_FLOW_LABEL |
                    IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;

        if (id_priv->id.ps == RDMA_PS_IPOIB)
                comp_mask |= IB_SA_MCMEMBER_REC_RATE |
                             IB_SA_MCMEMBER_REC_RATE_SELECTOR |
                             IB_SA_MCMEMBER_REC_MTU_SELECTOR |
                             IB_SA_MCMEMBER_REC_MTU |
                             IB_SA_MCMEMBER_REC_HOP_LIMIT;

        mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
                                         id_priv->id.port_num, &rec, comp_mask,
                                         GFP_KERNEL, cma_ib_mc_handler, mc);
        return PTR_ERR_OR_ZERO(mc->sa_mc);
}

static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
                              enum ib_gid_type gid_type)
{
        struct sockaddr_in *sin = (struct sockaddr_in *)addr;
        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;

        if (cma_any_addr(addr)) {
                memset(mgid, 0, sizeof *mgid);
        } else if (addr->sa_family == AF_INET6) {
                memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
        } else {
                mgid->raw[0] =
                        (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
                mgid->raw[1] =
                        (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
                mgid->raw[2] = 0;
                mgid->raw[3] = 0;
                mgid->raw[4] = 0;
                mgid->raw[5] = 0;
                mgid->raw[6] = 0;
                mgid->raw[7] = 0;
                mgid->raw[8] = 0;
                mgid->raw[9] = 0;
                mgid->raw[10] = 0xff;
                mgid->raw[11] = 0xff;
                *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
        }
}

static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
                                   struct cma_multicast *mc)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        int err = 0;
        struct sockaddr *addr = (struct sockaddr *)&mc->addr;
        struct net_device *ndev = NULL;
        struct ib_sa_multicast ib = {};
        enum ib_gid_type gid_type;
        bool send_only;

        send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);

        if (cma_zero_addr(addr))
                return -EINVAL;

        gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
                   rdma_start_port(id_priv->cma_dev->device)];
        cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);

        ib.rec.pkey = cpu_to_be16(0xffff);
        if (dev_addr->bound_dev_if)
                ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
        if (!ndev)
                return -ENODEV;

        ib.rec.rate = IB_RATE_PORT_CURRENT;
        ib.rec.hop_limit = 1;
        ib.rec.mtu = iboe_get_mtu(ndev->mtu);

        if (addr->sa_family == AF_INET) {
                if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
                        ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
                        if (!send_only) {
                                err = cma_igmp_send(ndev, &ib.rec.mgid,
                                                    true);
                        }
                }
        } else {
                if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
                        err = -ENOTSUPP;
        }
        dev_put(ndev);
        if (err || !ib.rec.mtu)
                return err ?: -EINVAL;

        if (!id_priv->qkey)
                cma_set_default_qkey(id_priv);

        rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                    &ib.rec.port_gid);
        INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
        cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
        queue_work(cma_wq, &mc->iboe_join.work);
        return 0;
}

int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
                        u8 join_state, void *context)
{
        struct rdma_id_private *id_priv =
                container_of(id, struct rdma_id_private, id);
        struct cma_multicast *mc;
        int ret;

        /* Not supported for kernel QPs */
        if (WARN_ON(id->qp))
                return -EINVAL;

        /* ULP is calling this wrong. */
        if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
                            READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
                return -EINVAL;

        if (id_priv->id.qp_type != IB_QPT_UD)
                return -EINVAL;

        mc = kzalloc_obj(*mc);
        if (!mc)
                return -ENOMEM;

        memcpy(&mc->addr, addr, rdma_addr_size(addr));
        mc->context = context;
        mc->id_priv = id_priv;
        mc->join_state = join_state;

        if (rdma_protocol_roce(id->device, id->port_num)) {
                ret = cma_iboe_join_multicast(id_priv, mc);
                if (ret)
                        goto out_err;
        } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
                ret = cma_join_ib_multicast(id_priv, mc);
                if (ret)
                        goto out_err;
        } else {
                ret = -ENOSYS;
                goto out_err;
        }

        spin_lock(&id_priv->lock);
        list_add(&mc->list, &id_priv->mc_list);
        spin_unlock(&id_priv->lock);

        return 0;
out_err:
        kfree(mc);
        return ret;
}
EXPORT_SYMBOL(rdma_join_multicast);

void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
{
        struct rdma_id_private *id_priv;
        struct cma_multicast *mc;

        id_priv = container_of(id, struct rdma_id_private, id);
        spin_lock_irq(&id_priv->lock);
        list_for_each_entry(mc, &id_priv->mc_list, list) {
                if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
                        continue;
                list_del(&mc->list);
                spin_unlock_irq(&id_priv->lock);

                WARN_ON(id_priv->cma_dev->device != id->device);
                destroy_mc(id_priv, mc);
                return;
        }
        spin_unlock_irq(&id_priv->lock);
}
EXPORT_SYMBOL(rdma_leave_multicast);

static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
{
        struct rdma_dev_addr *dev_addr;
        struct cma_work *work;

        dev_addr = &id_priv->id.route.addr.dev_addr;

        if ((dev_addr->bound_dev_if == ndev->ifindex) &&
            (net_eq(dev_net(ndev), dev_addr->net)) &&
            memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
                pr_info("RDMA CM addr change for ndev %s used by id %p\n",
                        ndev->name, &id_priv->id);
                work = kzalloc_obj(*work);
                if (!work)
                        return -ENOMEM;

                INIT_WORK(&work->work, cma_work_handler);
                work->id = id_priv;
                work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
                cma_id_get(id_priv);
                queue_work(cma_wq, &work->work);
        }

        return 0;
}

static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
                               void *ptr)
{
        struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
        struct cma_device *cma_dev;
        struct rdma_id_private *id_priv;
        int ret = NOTIFY_DONE;

        if (event != NETDEV_BONDING_FAILOVER)
                return NOTIFY_DONE;

        if (!netif_is_bond_master(ndev))
                return NOTIFY_DONE;

        mutex_lock(&lock);
        list_for_each_entry(cma_dev, &dev_list, list)
                list_for_each_entry(id_priv, &cma_dev->id_list, device_item) {
                        ret = cma_netdev_change(ndev, id_priv);
                        if (ret)
                                goto out;
                }

out:
        mutex_unlock(&lock);
        return ret;
}

static void cma_netevent_work_handler(struct work_struct *_work)
{
        struct rdma_id_private *id_priv =
                container_of(_work, struct rdma_id_private, id.net_work);
        struct rdma_cm_event event = {};

        mutex_lock(&id_priv->handler_mutex);

        if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
            READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
                goto out_unlock;

        event.event = RDMA_CM_EVENT_UNREACHABLE;
        event.status = -ETIMEDOUT;

        if (cma_cm_event_handler(id_priv, &event)) {
                __acquire(&id_priv->handler_mutex);
                id_priv->cm_id.ib = NULL;
                cma_id_put(id_priv);
                destroy_id_handler_unlock(id_priv);
                return;
        }

out_unlock:
        mutex_unlock(&id_priv->handler_mutex);
        cma_id_put(id_priv);
}

static int cma_netevent_callback(struct notifier_block *self,
                                 unsigned long event, void *ctx)
{
        struct id_table_entry *ips_node = NULL;
        struct rdma_id_private *current_id;
        struct neighbour *neigh = ctx;
        unsigned long flags;

        if (event != NETEVENT_NEIGH_UPDATE)
                return NOTIFY_DONE;

        spin_lock_irqsave(&id_table_lock, flags);
        if (neigh->tbl->family == AF_INET6) {
                struct sockaddr_in6 neigh_sock_6;

                neigh_sock_6.sin6_family = AF_INET6;
                neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key;
                ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
                                             (struct sockaddr *)&neigh_sock_6);
        } else if (neigh->tbl->family == AF_INET) {
                struct sockaddr_in neigh_sock_4;

                neigh_sock_4.sin_family = AF_INET;
                neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key);
                ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
                                             (struct sockaddr *)&neigh_sock_4);
        } else
                goto out;

        if (!ips_node)
                goto out;

        list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
                if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
                           neigh->ha, ETH_ALEN))
                        continue;
                cma_id_get(current_id);
                if (!queue_work(cma_wq, &current_id->id.net_work))
                        cma_id_put(current_id);
        }
out:
        spin_unlock_irqrestore(&id_table_lock, flags);
        return NOTIFY_DONE;
}

static struct notifier_block cma_nb = {
        .notifier_call = cma_netdev_callback
};

static struct notifier_block cma_netevent_cb = {
        .notifier_call = cma_netevent_callback
};

static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
{
        struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
        enum rdma_cm_state state;
        unsigned long flags;

        mutex_lock(&id_priv->handler_mutex);
        /* Record that we want to remove the device */
        spin_lock_irqsave(&id_priv->lock, flags);
        state = id_priv->state;
        if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
                spin_unlock_irqrestore(&id_priv->lock, flags);
                mutex_unlock(&id_priv->handler_mutex);
                cma_id_put(id_priv);
                return;
        }
        id_priv->state = RDMA_CM_DEVICE_REMOVAL;
        spin_unlock_irqrestore(&id_priv->lock, flags);

        if (cma_cm_event_handler(id_priv, &event)) {
                /*
                 * At this point the ULP promises it won't call
                 * rdma_destroy_id() concurrently
                 */
                cma_id_put(id_priv);
                mutex_unlock(&id_priv->handler_mutex);
                trace_cm_id_destroy(id_priv);
                _destroy_id(id_priv, state);
                return;
        }
        mutex_unlock(&id_priv->handler_mutex);

        /*
         * If this races with destroy then the thread that first assigns state
         * to a destroying does the cancel.
         */
        cma_cancel_operation(id_priv, state);
        cma_id_put(id_priv);
}

static void cma_process_remove(struct cma_device *cma_dev)
{
        mutex_lock(&lock);
        while (!list_empty(&cma_dev->id_list)) {
                struct rdma_id_private *id_priv = list_first_entry(
                        &cma_dev->id_list, struct rdma_id_private, device_item);

                list_del_init(&id_priv->listen_item);
                list_del_init(&id_priv->device_item);
                cma_id_get(id_priv);
                mutex_unlock(&lock);

                cma_send_device_removal_put(id_priv);

                mutex_lock(&lock);
        }
        mutex_unlock(&lock);

        cma_dev_put(cma_dev);
        wait_for_completion(&cma_dev->comp);
}

static bool cma_supported(struct ib_device *device)
{
        u32 i;

        rdma_for_each_port(device, i) {
                if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
                        return true;
        }
        return false;
}

static int cma_add_one(struct ib_device *device)
{
        struct rdma_id_private *to_destroy;
        struct cma_device *cma_dev;
        struct rdma_id_private *id_priv;
        unsigned long supported_gids = 0;
        int ret;
        u32 i;

        if (!cma_supported(device))
                return -EOPNOTSUPP;

        cma_dev = kmalloc_obj(*cma_dev);
        if (!cma_dev)
                return -ENOMEM;

        cma_dev->device = device;
        cma_dev->default_gid_type = kzalloc_objs(*cma_dev->default_gid_type,
                                                 device->phys_port_cnt);
        if (!cma_dev->default_gid_type) {
                ret = -ENOMEM;
                goto free_cma_dev;
        }

        cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
                                            sizeof(*cma_dev->default_roce_tos),
                                            GFP_KERNEL);
        if (!cma_dev->default_roce_tos) {
                ret = -ENOMEM;
                goto free_gid_type;
        }

        rdma_for_each_port (device, i) {
                supported_gids = roce_gid_type_mask_support(device, i);
                WARN_ON(!supported_gids);
                if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
                        cma_dev->default_gid_type[i - rdma_start_port(device)] =
                                CMA_PREFERRED_ROCE_GID_TYPE;
                else
                        cma_dev->default_gid_type[i - rdma_start_port(device)] =
                                find_first_bit(&supported_gids, BITS_PER_LONG);
                cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
        }

        init_completion(&cma_dev->comp);
        refcount_set(&cma_dev->refcount, 1);
        INIT_LIST_HEAD(&cma_dev->id_list);
        ib_set_client_data(device, &cma_client, cma_dev);

        mutex_lock(&lock);
        list_add_tail(&cma_dev->list, &dev_list);
        list_for_each_entry(id_priv, &listen_any_list, listen_any_item) {
                ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
                if (ret)
                        goto free_listen;
        }
        mutex_unlock(&lock);

        trace_cm_add_one(device);
        return 0;

free_listen:
        list_del(&cma_dev->list);
        mutex_unlock(&lock);

        /* cma_process_remove() will delete to_destroy */
        cma_process_remove(cma_dev);
        kfree(cma_dev->default_roce_tos);
free_gid_type:
        kfree(cma_dev->default_gid_type);

free_cma_dev:
        kfree(cma_dev);
        return ret;
}

static void cma_remove_one(struct ib_device *device, void *client_data)
{
        struct cma_device *cma_dev = client_data;

        trace_cm_remove_one(device);

        mutex_lock(&lock);
        list_del(&cma_dev->list);
        mutex_unlock(&lock);

        cma_process_remove(cma_dev);
        kfree(cma_dev->default_roce_tos);
        kfree(cma_dev->default_gid_type);
        kfree(cma_dev);
}

static int cma_init_net(struct net *net)
{
        struct cma_pernet *pernet = cma_pernet(net);

        xa_init(&pernet->tcp_ps);
        xa_init(&pernet->udp_ps);
        xa_init(&pernet->ipoib_ps);
        xa_init(&pernet->ib_ps);

        return 0;
}

static void cma_exit_net(struct net *net)
{
        struct cma_pernet *pernet = cma_pernet(net);

        WARN_ON(!xa_empty(&pernet->tcp_ps));
        WARN_ON(!xa_empty(&pernet->udp_ps));
        WARN_ON(!xa_empty(&pernet->ipoib_ps));
        WARN_ON(!xa_empty(&pernet->ib_ps));
}

static struct pernet_operations cma_pernet_operations = {
        .init = cma_init_net,
        .exit = cma_exit_net,
        .id = &cma_pernet_id,
        .size = sizeof(struct cma_pernet),
};

static int __init cma_init(void)
{
        int ret;

        /*
         * There is a rare lock ordering dependency in cma_netdev_callback()
         * that only happens when bonding is enabled. Teach lockdep that rtnl
         * must never be nested under lock so it can find these without having
         * to test with bonding.
         */
        if (IS_ENABLED(CONFIG_LOCKDEP)) {
                rtnl_lock();
                mutex_lock(&lock);
                mutex_unlock(&lock);
                rtnl_unlock();
        }

        cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
        if (!cma_wq)
                return -ENOMEM;

        ret = register_pernet_subsys(&cma_pernet_operations);
        if (ret)
                goto err_wq;

        ib_sa_register_client(&sa_client);
        register_netdevice_notifier(&cma_nb);
        register_netevent_notifier(&cma_netevent_cb);

        ret = ib_register_client(&cma_client);
        if (ret)
                goto err;

        ret = cma_configfs_init();
        if (ret)
                goto err_ib;

        return 0;

err_ib:
        ib_unregister_client(&cma_client);
err:
        unregister_netevent_notifier(&cma_netevent_cb);
        unregister_netdevice_notifier(&cma_nb);
        ib_sa_unregister_client(&sa_client);
        unregister_pernet_subsys(&cma_pernet_operations);
err_wq:
        destroy_workqueue(cma_wq);
        return ret;
}

static void __exit cma_cleanup(void)
{
        cma_configfs_exit();
        ib_unregister_client(&cma_client);
        unregister_netevent_notifier(&cma_netevent_cb);
        unregister_netdevice_notifier(&cma_nb);
        ib_sa_unregister_client(&sa_client);
        unregister_pernet_subsys(&cma_pernet_operations);
        destroy_workqueue(cma_wq);
}

module_init(cma_init);
module_exit(cma_cleanup);

static void cma_query_ib_service_handler(int status,
                                         struct sa_service_rec *recs,
                                         unsigned int num_recs, void *context)
{
        struct cma_work *work = context;
        struct rdma_id_private *id_priv = work->id;
        struct sockaddr_ib *addr;

        if (status)
                goto fail;

        if (!num_recs) {
                status = -ENOENT;
                goto fail;
        }

        if (id_priv->id.route.service_recs) {
                status = -EALREADY;
                goto fail;
        }

        id_priv->id.route.service_recs =
                kmalloc_objs(*recs, num_recs);
        if (!id_priv->id.route.service_recs) {
                status = -ENOMEM;
                goto fail;
        }

        id_priv->id.route.num_service_recs = num_recs;
        memcpy(id_priv->id.route.service_recs, recs, sizeof(*recs) * num_recs);

        addr = (struct sockaddr_ib *)&id_priv->id.route.addr.dst_addr;
        addr->sib_family = AF_IB;
        addr->sib_addr = *(struct ib_addr *)&recs->gid;
        addr->sib_pkey = recs->pkey;
        addr->sib_sid = recs->id;
        rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr,
                           (union ib_gid *)&addr->sib_addr);
        ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr,
                         ntohs(addr->sib_pkey));

        queue_work(cma_wq, &work->work);
        return;

fail:
        work->old_state = RDMA_CM_ADDRINFO_QUERY;
        work->new_state = RDMA_CM_ADDR_BOUND;
        work->event.event = RDMA_CM_EVENT_ADDRINFO_ERROR;
        work->event.status = status;
        pr_debug_ratelimited(
                "RDMA CM: SERVICE_ERROR: failed to query service record. status %d\n",
                status);
        queue_work(cma_wq, &work->work);
}

static int cma_resolve_ib_service(struct rdma_id_private *id_priv,
                                  struct rdma_ucm_ib_service *ibs)
{
        struct sa_service_rec sr = {};
        ib_sa_comp_mask mask = 0;
        struct cma_work *work;

        work = kzalloc_obj(*work);
        if (!work)
                return -ENOMEM;

        cma_id_get(id_priv);

        work->id = id_priv;
        INIT_WORK(&work->work, cma_work_handler);
        work->old_state = RDMA_CM_ADDRINFO_QUERY;
        work->new_state = RDMA_CM_ADDRINFO_RESOLVED;
        work->event.event = RDMA_CM_EVENT_ADDRINFO_RESOLVED;

        if (ibs->flags & RDMA_USER_CM_IB_SERVICE_FLAG_ID) {
                sr.id = cpu_to_be64(ibs->service_id);
                mask |= IB_SA_SERVICE_REC_SERVICE_ID;
        }
        if (ibs->flags & RDMA_USER_CM_IB_SERVICE_FLAG_NAME) {
                strscpy(sr.name, ibs->service_name, sizeof(sr.name));
                mask |= IB_SA_SERVICE_REC_SERVICE_NAME;
        }

        id_priv->query_id = ib_sa_service_rec_get(&sa_client,
                                                  id_priv->id.device,
                                                  id_priv->id.port_num,
                                                  &sr, mask,
                                                  2000, GFP_KERNEL,
                                                  cma_query_ib_service_handler,
                                                  work, &id_priv->query);

        if (id_priv->query_id < 0) {
                cma_id_put(id_priv);
                kfree(work);
                return id_priv->query_id;
        }

        return 0;
}

int rdma_resolve_ib_service(struct rdma_cm_id *id,
                            struct rdma_ucm_ib_service *ibs)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!id_priv->cma_dev ||
            !cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDRINFO_QUERY))
                return -EINVAL;

        if (rdma_cap_ib_sa(id->device, id->port_num))
                ret = cma_resolve_ib_service(id_priv, ibs);
        else
                ret = -EOPNOTSUPP;

        if (ret)
                goto err;

        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_ADDRINFO_QUERY, RDMA_CM_ADDR_BOUND);
        return ret;
}
EXPORT_SYMBOL(rdma_resolve_ib_service);