/*-
 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
 *
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <sys/cdefs.h>
#include "ipoib.h"
#include <sys/eventhandler.h>

#include <linux/module.h>

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>

#include <linux/if_vlan.h>

#include <net/infiniband.h>

#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
MODULE_LICENSE("Dual BSD/GPL");

int ipoib_sendq_size = IPOIB_TX_RING_SIZE;
int ipoib_recvq_size = IPOIB_RX_RING_SIZE;

module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
int ipoib_debug_level = 1;

module_param_named(debug_level, ipoib_debug_level, int, 0644);
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
#endif

struct ipoib_path_iter {
        struct ipoib_dev_priv *priv;
        struct ipoib_path  path;
};

static const u8 ipv4_bcast_addr[] = {
        0x00, 0xff, 0xff, 0xff,
        0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
};

struct workqueue_struct *ipoib_workqueue;

struct ib_sa_client ipoib_sa_client;

static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static if_t ipoib_get_net_dev_by_params(
                struct ib_device *dev, u8 port, u16 pkey,
                const union ib_gid *gid, const struct sockaddr *addr,
                void *client_data);
static void ipoib_start(if_t dev);
static int ipoib_ioctl(if_t ifp, u_long command, caddr_t data);

static struct unrhdr *ipoib_unrhdr;

static void
ipoib_unrhdr_init(void *arg)
{

        ipoib_unrhdr = new_unrhdr(0, 65535, NULL);
}
SYSINIT(ipoib_unrhdr_init, SI_SUB_KLD - 1, SI_ORDER_ANY, ipoib_unrhdr_init, NULL);

static void
ipoib_unrhdr_uninit(void *arg)
{

        if (ipoib_unrhdr != NULL) {
                struct unrhdr *hdr;

                hdr = ipoib_unrhdr;
                ipoib_unrhdr = NULL;

                delete_unrhdr(hdr);
        }
}
SYSUNINIT(ipoib_unrhdr_uninit, SI_SUB_KLD - 1, SI_ORDER_ANY, ipoib_unrhdr_uninit, NULL);

static struct ib_client ipoib_client = {
        .name   = "ipoib",
        .add    = ipoib_add_one,
        .remove = ipoib_remove_one,
        .get_net_dev_by_params = ipoib_get_net_dev_by_params,
};

int
ipoib_open(struct ipoib_dev_priv *priv)
{
        if_t dev = priv->dev;

        ipoib_dbg(priv, "bringing up interface\n");

        set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

        if (ipoib_pkey_dev_delay_open(priv))
                return 0;

        if (ipoib_ib_dev_open(priv))
                goto err_disable;

        if (ipoib_ib_dev_up(priv))
                goto err_stop;

        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
                struct ipoib_dev_priv *cpriv;

                /* Bring up any child interfaces too */
                mutex_lock(&priv->vlan_mutex);
                list_for_each_entry(cpriv, &priv->child_intfs, list)
                        if ((if_getdrvflags(cpriv->dev) & IFF_DRV_RUNNING) == 0)
                                ipoib_open(cpriv);
                mutex_unlock(&priv->vlan_mutex);
        }
        if_setdrvflagbits(dev, IFF_DRV_RUNNING, IFF_DRV_OACTIVE);

        return 0;

err_stop:
        ipoib_ib_dev_stop(priv, 1);

err_disable:
        clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

        return -EINVAL;
}

static void
ipoib_init(void *arg)
{
        if_t dev;
        struct ipoib_dev_priv *priv;

        priv = arg;
        dev = priv->dev;
        if ((if_getdrvflags(dev) & IFF_DRV_RUNNING) == 0)
                ipoib_open(priv);
        queue_work(ipoib_workqueue, &priv->flush_light);
}


static int
ipoib_stop(struct ipoib_dev_priv *priv)
{
        if_t dev = priv->dev;

        ipoib_dbg(priv, "stopping interface\n");

        clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);

        if_setdrvflagbits(dev, 0, IFF_DRV_RUNNING | IFF_DRV_OACTIVE);

        ipoib_ib_dev_down(priv, 0);
        ipoib_ib_dev_stop(priv, 0);

        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
                struct ipoib_dev_priv *cpriv;

                /* Bring down any child interfaces too */
                mutex_lock(&priv->vlan_mutex);
                list_for_each_entry(cpriv, &priv->child_intfs, list)
                        if ((if_getdrvflags(cpriv->dev) & IFF_DRV_RUNNING) != 0)
                                ipoib_stop(cpriv);
                mutex_unlock(&priv->vlan_mutex);
        }

        return 0;
}

static int
ipoib_propagate_ifnet_mtu(struct ipoib_dev_priv *priv, int new_mtu,
    bool propagate)
{
        if_t ifp;
        struct ifreq ifr;
        int error;

        ifp = priv->dev;
        if (if_getmtu(ifp) == new_mtu)
                return (0);
        if (propagate) {
                strlcpy(ifr.ifr_name, if_name(ifp), IFNAMSIZ);
                ifr.ifr_mtu = new_mtu;
                CURVNET_SET(if_getvnet(ifp));
                error = ifhwioctl(SIOCSIFMTU, ifp, (caddr_t)&ifr, curthread);
                CURVNET_RESTORE();
        } else {
                if_setmtu(ifp, new_mtu);
                error = 0;
        }
        return (error);
}

int
ipoib_change_mtu(struct ipoib_dev_priv *priv, int new_mtu, bool propagate)
{
        int error, prev_admin_mtu;

        /* dev->if_mtu > 2K ==> connected mode */
        if (ipoib_cm_admin_enabled(priv)) {
                if (new_mtu > IPOIB_CM_MTU(ipoib_cm_max_mtu(priv)))
                        return -EINVAL;

                if (new_mtu > priv->mcast_mtu)
                        ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
                                   priv->mcast_mtu);

                return (ipoib_propagate_ifnet_mtu(priv, new_mtu, propagate));
        }

        if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
                return -EINVAL;

        prev_admin_mtu = priv->admin_mtu;
        priv->admin_mtu = new_mtu;
        error = ipoib_propagate_ifnet_mtu(priv, min(priv->mcast_mtu,
            priv->admin_mtu), propagate);
        if (error == 0) {
                /* check for MTU change to avoid infinite loop */
                if (prev_admin_mtu != new_mtu)
                        queue_work(ipoib_workqueue, &priv->flush_light);
        } else
                priv->admin_mtu = prev_admin_mtu;
        return (error);
}

static int
ipoib_ioctl(if_t ifp, u_long command, caddr_t data)
{
        struct ipoib_dev_priv *priv = if_getsoftc(ifp);
        struct ifaddr *ifa = (struct ifaddr *) data;
        struct ifreq *ifr = (struct ifreq *) data;
        int error = 0;

        /* check if detaching */
        if (priv == NULL)
                return (ENXIO);
        /* wait for device to become ready, if any */
        while (priv->gone == 2)
                pause("W", 1);
        /* check for device gone */
        if (priv->gone != 0)
                return (ENXIO);

        switch (command) {
        case SIOCSIFFLAGS:
                if (if_getflags(ifp) & IFF_UP) {
                        if ((if_getdrvflags(ifp) & IFF_DRV_RUNNING) == 0)
                                error = -ipoib_open(priv);
                } else
                        if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
                                ipoib_stop(priv);
                break;
        case SIOCADDMULTI:
        case SIOCDELMULTI:
                if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
                        queue_work(ipoib_workqueue, &priv->restart_task);
                break;
        case SIOCSIFADDR:
                if_setflagbits(ifp, IFF_UP, 0);

                switch (ifa->ifa_addr->sa_family) {
#ifdef INET
                case AF_INET:
                        if_init(ifp, if_getsoftc(ifp)); /* before arpwhohas */
                        arp_ifinit(ifp, ifa);
                        break;
#endif
                default:
                        if_init(ifp, if_getsoftc(ifp));
                        break;
                }
                break;

        case SIOCGIFADDR:
                        bcopy(if_getlladdr(ifp), &ifr->ifr_addr.sa_data[0],
                            INFINIBAND_ALEN);
                break;

        case SIOCSIFMTU:
                /*
                 * Set the interface MTU.
                 */
                error = -ipoib_change_mtu(priv, ifr->ifr_mtu, false);
                break;
        default:
                error = EINVAL;
                break;
        }
        return (error);
}


static struct ipoib_path *
__path_find(struct ipoib_dev_priv *priv, void *gid)
{
        struct rb_node *n = priv->path_tree.rb_node;
        struct ipoib_path *path;
        int ret;

        while (n) {
                path = rb_entry(n, struct ipoib_path, rb_node);

                ret = memcmp(gid, path->pathrec.dgid.raw,
                             sizeof (union ib_gid));

                if (ret < 0)
                        n = n->rb_left;
                else if (ret > 0)
                        n = n->rb_right;
                else
                        return path;
        }

        return NULL;
}

static int
__path_add(struct ipoib_dev_priv *priv, struct ipoib_path *path)
{
        struct rb_node **n = &priv->path_tree.rb_node;
        struct rb_node *pn = NULL;
        struct ipoib_path *tpath;
        int ret;

        while (*n) {
                pn = *n;
                tpath = rb_entry(pn, struct ipoib_path, rb_node);

                ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
                             sizeof (union ib_gid));
                if (ret < 0)
                        n = &pn->rb_left;
                else if (ret > 0)
                        n = &pn->rb_right;
                else
                        return -EEXIST;
        }

        rb_link_node(&path->rb_node, pn, n);
        rb_insert_color(&path->rb_node, &priv->path_tree);

        list_add_tail(&path->list, &priv->path_list);

        return 0;
}

void
ipoib_path_free(struct ipoib_dev_priv *priv, struct ipoib_path *path)
{

        _IF_DRAIN(&path->queue);

        if (path->ah)
                ipoib_put_ah(path->ah);
        if (ipoib_cm_get(path))
                ipoib_cm_destroy_tx(ipoib_cm_get(path));

        kfree(path);
}

#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG

struct ipoib_path_iter *
ipoib_path_iter_init(struct ipoib_dev_priv *priv)
{
        struct ipoib_path_iter *iter;

        iter = kmalloc(sizeof *iter, GFP_KERNEL);
        if (!iter)
                return NULL;

        iter->priv = priv;
        memset(iter->path.pathrec.dgid.raw, 0, 16);

        if (ipoib_path_iter_next(iter)) {
                kfree(iter);
                return NULL;
        }

        return iter;
}

int
ipoib_path_iter_next(struct ipoib_path_iter *iter)
{
        struct ipoib_dev_priv *priv = iter->priv;
        struct rb_node *n;
        struct ipoib_path *path;
        int ret = 1;

        spin_lock_irq(&priv->lock);

        n = rb_first(&priv->path_tree);

        while (n) {
                path = rb_entry(n, struct ipoib_path, rb_node);

                if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
                           sizeof (union ib_gid)) < 0) {
                        iter->path = *path;
                        ret = 0;
                        break;
                }

                n = rb_next(n);
        }

        spin_unlock_irq(&priv->lock);

        return ret;
}

void
ipoib_path_iter_read(struct ipoib_path_iter *iter, struct ipoib_path *path)
{
        *path = iter->path;
}

#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */

void
ipoib_mark_paths_invalid(struct ipoib_dev_priv *priv)
{
        struct ipoib_path *path, *tp;

        spin_lock_irq(&priv->lock);

        list_for_each_entry_safe(path, tp, &priv->path_list, list) {
                ipoib_dbg(priv, "mark path LID 0x%04x GID %16D invalid\n",
                        be16_to_cpu(path->pathrec.dlid),
                        path->pathrec.dgid.raw, ":");
                path->valid =  0;
        }

        spin_unlock_irq(&priv->lock);
}

void
ipoib_flush_paths(struct ipoib_dev_priv *priv)
{
        struct ipoib_path *path, *tp;
        LIST_HEAD(remove_list);
        unsigned long flags;

        spin_lock_irqsave(&priv->lock, flags);

        list_splice_init(&priv->path_list, &remove_list);

        list_for_each_entry(path, &remove_list, list)
                rb_erase(&path->rb_node, &priv->path_tree);

        list_for_each_entry_safe(path, tp, &remove_list, list) {
                if (path->query)
                        ib_sa_cancel_query(path->query_id, path->query);
                spin_unlock_irqrestore(&priv->lock, flags);
                wait_for_completion(&path->done);
                ipoib_path_free(priv, path);
                spin_lock_irqsave(&priv->lock, flags);
        }

        spin_unlock_irqrestore(&priv->lock, flags);
}

static void
path_rec_completion(int status, struct ib_sa_path_rec *pathrec, void *path_ptr)
{
        struct ipoib_path *path = path_ptr;
        struct ipoib_dev_priv *priv = path->priv;
        if_t dev = priv->dev;
        struct ipoib_ah *ah = NULL;
        struct ipoib_ah *old_ah = NULL;
        struct epoch_tracker et;
        struct ifqueue mbqueue;
        struct mbuf *mb;
        unsigned long flags;

        if (!status)
                ipoib_dbg(priv, "PathRec LID 0x%04x for GID %16D\n",
                          be16_to_cpu(pathrec->dlid), pathrec->dgid.raw, ":");
        else
                ipoib_dbg(priv, "PathRec status %d for GID %16D\n",
                          status, path->pathrec.dgid.raw, ":");

        bzero(&mbqueue, sizeof(mbqueue));

        if (!status) {
                struct ib_ah_attr av;

                if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
                        ah = ipoib_create_ah(priv, priv->pd, &av);
        }

        spin_lock_irqsave(&priv->lock, flags);

        if (ah) {
                path->pathrec = *pathrec;

                old_ah   = path->ah;
                path->ah = ah;

                ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
                          ah, be16_to_cpu(pathrec->dlid), pathrec->sl);

                for (;;) {
                        _IF_DEQUEUE(&path->queue, mb);
                        if (mb == NULL)
                                break;
                        _IF_ENQUEUE(&mbqueue, mb);
                }

#ifdef CONFIG_INFINIBAND_IPOIB_CM
                if (ipoib_cm_enabled(priv, path->hwaddr) && !ipoib_cm_get(path))
                        ipoib_cm_set(path, ipoib_cm_create_tx(priv, path));
#endif

                path->valid = 1;
        }

        path->query = NULL;
        complete(&path->done);

        spin_unlock_irqrestore(&priv->lock, flags);

        if (old_ah)
                ipoib_put_ah(old_ah);

        NET_EPOCH_ENTER(et);
        for (;;) {
                _IF_DEQUEUE(&mbqueue, mb);
                if (mb == NULL)
                        break;
                mb->m_pkthdr.rcvif = dev;
                if (if_transmit(dev, mb))
                        ipoib_warn(priv, "dev_queue_xmit failed "
                                   "to requeue packet\n");
        }
        NET_EPOCH_EXIT(et);
}

static struct ipoib_path *
path_rec_create(struct ipoib_dev_priv *priv, uint8_t *hwaddr)
{
        struct ipoib_path *path;

        if (!priv->broadcast)
                return NULL;

        path = kzalloc(sizeof *path, GFP_ATOMIC);
        if (!path)
                return NULL;

        path->priv = priv;

        bzero(&path->queue, sizeof(path->queue));

#ifdef CONFIG_INFINIBAND_IPOIB_CM
        memcpy(&path->hwaddr, hwaddr, INFINIBAND_ALEN);
#endif
        memcpy(path->pathrec.dgid.raw, &hwaddr[4], sizeof (union ib_gid));
        path->pathrec.sgid          = priv->local_gid;
        path->pathrec.pkey          = cpu_to_be16(priv->pkey);
        path->pathrec.numb_path     = 1;
        path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;

        return path;
}

static int
path_rec_start(struct ipoib_dev_priv *priv, struct ipoib_path *path)
{
        if_t dev = priv->dev;

        ib_sa_comp_mask comp_mask = IB_SA_PATH_REC_MTU_SELECTOR | IB_SA_PATH_REC_MTU;
        struct ib_sa_path_rec p_rec;

        p_rec = path->pathrec;
        p_rec.mtu_selector = IB_SA_GT;

        switch (roundup_pow_of_two(if_getmtu(dev) + IPOIB_ENCAP_LEN)) {
        case 512:
                p_rec.mtu = IB_MTU_256;
                break;
        case 1024:
                p_rec.mtu = IB_MTU_512;
                break;
        case 2048:
                p_rec.mtu = IB_MTU_1024;
                break;
        case 4096:
                p_rec.mtu = IB_MTU_2048;
                break;
        default:
                /* Wildcard everything */
                comp_mask = 0;
                p_rec.mtu = 0;
                p_rec.mtu_selector = 0;
        }

        ipoib_dbg(priv, "Start path record lookup for %16D MTU > %d\n",
                  p_rec.dgid.raw, ":",
                  comp_mask ? ib_mtu_enum_to_int(p_rec.mtu) : 0);

        init_completion(&path->done);

        path->query_id =
                ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
                                   &p_rec, comp_mask            |
                                   IB_SA_PATH_REC_DGID          |
                                   IB_SA_PATH_REC_SGID          |
                                   IB_SA_PATH_REC_NUMB_PATH     |
                                   IB_SA_PATH_REC_TRAFFIC_CLASS |
                                   IB_SA_PATH_REC_PKEY,
                                   1000, GFP_ATOMIC,
                                   path_rec_completion,
                                   path, &path->query);
        if (path->query_id < 0) {
                ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
                path->query = NULL;
                complete(&path->done);
                return path->query_id;
        }

        return 0;
}

static void
ipoib_unicast_send(struct mbuf *mb, struct ipoib_dev_priv *priv, struct ipoib_header *eh)
{
        struct ipoib_path *path;

        path = __path_find(priv, eh->hwaddr + 4);
        if (!path || !path->valid) {
                int new_path = 0;

                if (!path) {
                        path = path_rec_create(priv, eh->hwaddr);
                        new_path = 1;
                }
                if (path) {
                        if (_IF_QLEN(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE)
                                _IF_ENQUEUE(&path->queue, mb);
                        else {
                                if_inc_counter(priv->dev, IFCOUNTER_OERRORS, 1);
                                m_freem(mb);
                        }

                        if (!path->query && path_rec_start(priv, path)) {
                                if (new_path)
                                        ipoib_path_free(priv, path);
                                return;
                        } else
                                __path_add(priv, path);
                } else {
                        if_inc_counter(priv->dev, IFCOUNTER_OERRORS, 1);
                        m_freem(mb);
                }

                return;
        }

        if (ipoib_cm_get(path) && ipoib_cm_up(path)) {
                ipoib_cm_send(priv, mb, ipoib_cm_get(path));
        } else if (path->ah) {
                ipoib_send(priv, mb, path->ah, IPOIB_QPN(eh->hwaddr));
        } else if ((path->query || !path_rec_start(priv, path)) &&
                    path->queue.ifq_len < IPOIB_MAX_PATH_REC_QUEUE) {
                _IF_ENQUEUE(&path->queue, mb);
        } else {
                if_inc_counter(priv->dev, IFCOUNTER_OERRORS, 1);
                m_freem(mb);
        }
}

static int
ipoib_send_one(struct ipoib_dev_priv *priv, struct mbuf *mb)
{
        struct ipoib_header *eh;

        eh = mtod(mb, struct ipoib_header *);
        if (IPOIB_IS_MULTICAST(eh->hwaddr)) {
                /* Add in the P_Key for multicast*/
                eh->hwaddr[8] = (priv->pkey >> 8) & 0xff;
                eh->hwaddr[9] = priv->pkey & 0xff;

                ipoib_mcast_send(priv, eh->hwaddr + 4, mb);
        } else
                ipoib_unicast_send(mb, priv, eh);

        return 0;
}

void
ipoib_start_locked(if_t dev, struct ipoib_dev_priv *priv)
{
        struct mbuf *mb;

        assert_spin_locked(&priv->lock);

        while (!if_sendq_empty(dev) &&
            (if_getdrvflags(dev) & IFF_DRV_OACTIVE) == 0) {
                mb = if_dequeue(dev);
                if (mb == NULL)
                        break;
                infiniband_bpf_mtap(dev, mb);
                ipoib_send_one(priv, mb);
        }
}

static void
_ipoib_start(if_t dev, struct ipoib_dev_priv *priv)
{

        if ((if_getdrvflags(dev) & (IFF_DRV_RUNNING|IFF_DRV_OACTIVE)) !=
            IFF_DRV_RUNNING)
                return;

        spin_lock(&priv->lock);
        ipoib_start_locked(dev, priv);
        spin_unlock(&priv->lock);
}

static void
ipoib_start(if_t dev)
{
        _ipoib_start(dev, if_getsoftc(dev));
}

static void
ipoib_vlan_start(if_t dev)
{
        struct ipoib_dev_priv *priv;
        struct mbuf *mb;

        priv = VLAN_COOKIE(dev);
        if (priv != NULL)
                return _ipoib_start(dev, priv);
        while (!if_sendq_empty(dev)) {
                mb = if_dequeue(dev);
                if (mb == NULL)
                        break;
                m_freem(mb);
                if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
        }
}

int
ipoib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
{

        /* Allocate RX/TX "rings" to hold queued mbs */
        priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
                                GFP_KERNEL);
        if (!priv->rx_ring) {
                printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
                       ca->name, ipoib_recvq_size);
                goto out;
        }

        priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring, GFP_KERNEL);
        if (!priv->tx_ring) {
                printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
                       ca->name, ipoib_sendq_size);
                goto out_rx_ring_cleanup;
        }
        memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);

        /* priv->tx_head, tx_tail & tx_outstanding are already 0 */

        if (ipoib_ib_dev_init(priv, ca, port))
                goto out_tx_ring_cleanup;

        return 0;

out_tx_ring_cleanup:
        kfree(priv->tx_ring);

out_rx_ring_cleanup:
        kfree(priv->rx_ring);

out:
        return -ENOMEM;
}

static void
ipoib_ifdetach(struct ipoib_dev_priv *priv)
{
        if_t dev;

        dev = priv->dev;
        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
                priv->gone = 1;
                infiniband_ifdetach(dev);
        }
}

static void
ipoib_detach(struct ipoib_dev_priv *priv)
{
        if_t dev;

        dev = priv->dev;
        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
                if_free(dev);
                free_unr(ipoib_unrhdr, priv->unit);
        } else
                VLAN_SETCOOKIE(priv->dev, NULL);

        free(priv, M_TEMP);
}

void
ipoib_dev_cleanup(struct ipoib_dev_priv *priv)
{
        struct ipoib_dev_priv *cpriv, *tcpriv;

        /* Delete any child interfaces first */
        list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
                ipoib_ifdetach(cpriv);
                ipoib_dev_cleanup(cpriv);
                ipoib_detach(cpriv);
        }

        ipoib_ib_dev_cleanup(priv);

        kfree(priv->rx_ring);
        kfree(priv->tx_ring);

        priv->rx_ring = NULL;
        priv->tx_ring = NULL;
}

static struct ipoib_dev_priv *
ipoib_priv_alloc(void)
{
        struct ipoib_dev_priv *priv;

        priv = malloc(sizeof(struct ipoib_dev_priv), M_TEMP, M_ZERO|M_WAITOK);
        spin_lock_init(&priv->lock);
        spin_lock_init(&priv->drain_lock);
        mutex_init(&priv->vlan_mutex);
        INIT_LIST_HEAD(&priv->path_list);
        INIT_LIST_HEAD(&priv->child_intfs);
        INIT_LIST_HEAD(&priv->dead_ahs);
        INIT_LIST_HEAD(&priv->multicast_list);
        INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
        INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
        INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
        INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
        INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
        INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
        INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
        INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
        memcpy(priv->broadcastaddr, ipv4_bcast_addr, INFINIBAND_ALEN);

        return (priv);
}

struct ipoib_dev_priv *
ipoib_intf_alloc(const char *name, struct ib_device *hca)
{
        struct ipoib_dev_priv *priv;
        if_t dev;

        priv = ipoib_priv_alloc();
        dev = priv->dev = if_alloc(IFT_INFINIBAND);
        if_setsoftc(dev, priv);
        priv->gone = 2; /* initializing */
        priv->unit = alloc_unr(ipoib_unrhdr);
        if (priv->unit == -1) {
                if_free(dev);
                free(priv, M_TEMP);
                return NULL;
        }
        if_initname(dev, name, priv->unit);
        if_setflags(dev, IFF_BROADCAST | IFF_MULTICAST);
        if ((hca->attrs.device_cap_flags & IB_DEVICE_KNOWSEPOCH) == 0)
                if_setflagbits(dev, IFF_NEEDSEPOCH, 0);

        infiniband_ifattach(priv->dev, NULL, priv->broadcastaddr);

        if_setinitfn(dev, ipoib_init);
        if_setioctlfn(dev, ipoib_ioctl);
        if_setstartfn(dev, ipoib_start);

        if_setsendqlen(dev, ipoib_sendq_size * 2);

        priv->dev = dev;
        if_link_state_change(priv->dev, LINK_STATE_DOWN);

        return if_getsoftc(dev);
}

int
ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
{
        struct ib_device_attr *device_attr = &hca->attrs;

        priv->hca_caps = device_attr->device_cap_flags;

        if_sethwassist(priv->dev, 0);
        if_setcapabilities(priv->dev, 0);

#ifndef CONFIG_INFINIBAND_IPOIB_CM
        if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
                set_bit(IPOIB_FLAG_CSUM, &priv->flags);
                if_sethwassist(priv->dev, CSUM_IP | CSUM_TCP | CSUM_UDP);
                if_setcapabilities(priv->dev, IFCAP_HWCSUM | IFCAP_VLAN_HWCSUM);
        }

#if 0
        if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO) {
                priv->dev->if_capabilities |= IFCAP_TSO4;
                priv->dev->if_hwassist |= CSUM_TSO;
        }
#endif
#endif
        if_setcapabilitiesbit(priv->dev,
            IFCAP_VLAN_HWTAGGING | IFCAP_VLAN_MTU | IFCAP_LINKSTATE, 0);
        if_setcapenable(priv->dev, if_getcapabilities(priv->dev));

        return 0;
}


static if_t
ipoib_add_port(const char *format, struct ib_device *hca, u8 port)
{
        struct ipoib_dev_priv *priv;
        struct ib_port_attr attr;
        int result = -ENOMEM;

        priv = ipoib_intf_alloc(format, hca);
        if (!priv)
                goto alloc_mem_failed;

        if (!ib_query_port(hca, port, &attr))
                priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
        else {
                printk(KERN_WARNING "%s: ib_query_port %d failed\n",
                       hca->name, port);
                goto device_init_failed;
        }

        /* MTU will be reset when mcast join happens */
        if_setmtu(priv->dev, IPOIB_UD_MTU(priv->max_ib_mtu));
        priv->mcast_mtu = priv->admin_mtu = if_getmtu(priv->dev);

        result = ib_query_pkey(hca, port, 0, &priv->pkey);
        if (result) {
                printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
                       hca->name, port, result);
                goto device_init_failed;
        }

        if (ipoib_set_dev_features(priv, hca))
                goto device_init_failed;

        /*
         * Set the full membership bit, so that we join the right
         * broadcast group, etc.
         */
        priv->pkey |= 0x8000;

        priv->broadcastaddr[8] = priv->pkey >> 8;
        priv->broadcastaddr[9] = priv->pkey & 0xff;

        result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
        if (result) {
                printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
                       hca->name, port, result);
                goto device_init_failed;
        }
        memcpy(if_getlladdr(priv->dev) + 4, priv->local_gid.raw, sizeof(union ib_gid));

        result = ipoib_dev_init(priv, hca, port);
        if (result < 0) {
                printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
                       hca->name, port, result);
                goto device_init_failed;
        }
        if (ipoib_cm_admin_enabled(priv))
                if_setmtu(priv->dev, IPOIB_CM_MTU(ipoib_cm_max_mtu(priv)));

        INIT_IB_EVENT_HANDLER(&priv->event_handler,
                              priv->ca, ipoib_event);
        result = ib_register_event_handler(&priv->event_handler);
        if (result < 0) {
                printk(KERN_WARNING "%s: ib_register_event_handler failed for "
                       "port %d (ret = %d)\n",
                       hca->name, port, result);
                goto event_failed;
        }
        if_printf(priv->dev, "Attached to %s port %d\n", hca->name, port);

        priv->gone = 0; /* ready */

        return priv->dev;

event_failed:
        ipoib_dev_cleanup(priv);

device_init_failed:
        ipoib_ifdetach(priv);
        ipoib_detach(priv);

alloc_mem_failed:
        return ERR_PTR(result);
}

static void
ipoib_add_one(struct ib_device *device)
{
        struct list_head *dev_list;
        if_t dev;
        struct ipoib_dev_priv *priv;
        int s, e, p;

        if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
                return;

        dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
        if (!dev_list)
                return;

        INIT_LIST_HEAD(dev_list);

        if (device->node_type == RDMA_NODE_IB_SWITCH) {
                s = 0;
                e = 0;
        } else {
                s = 1;
                e = device->phys_port_cnt;
        }

        for (p = s; p <= e; ++p) {
                if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
                        continue;
                dev = ipoib_add_port("ib", device, p);
                if (!IS_ERR(dev)) {
                        priv = if_getsoftc(dev);
                        list_add_tail(&priv->list, dev_list);
                }
        }

        ib_set_client_data(device, &ipoib_client, dev_list);
}

static void
ipoib_remove_one(struct ib_device *device, void *client_data)
{
        struct ipoib_dev_priv *priv, *tmp;
        struct list_head *dev_list = client_data;

        if (!dev_list)
                return;

        if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
                return;

        list_for_each_entry_safe(priv, tmp, dev_list, list) {
                if (rdma_port_get_link_layer(device, priv->port) != IB_LINK_LAYER_INFINIBAND)
                        continue;

                ipoib_ifdetach(priv);
                ipoib_stop(priv);

                ib_unregister_event_handler(&priv->event_handler);

                flush_workqueue(ipoib_workqueue);

                ipoib_dev_cleanup(priv);
                ipoib_detach(priv);
        }

        kfree(dev_list);
}

static u_int
ipoib_match_dev_addr_cb(void *arg, struct ifaddr *ifa, u_int count)
{
        struct sockaddr *addr = arg;

        /* If a match is already found, skip this. */
        if (count > 0)
                return (0);

        if (ifa->ifa_addr->sa_len != addr->sa_len)
                return (0);

        if (memcmp(ifa->ifa_addr, addr, addr->sa_len) == 0)
                return (1);

        return (0);
}

static int
ipoib_match_dev_addr(const struct sockaddr *addr, if_t dev)
{
        struct epoch_tracker et;
        int retval = 0;

        NET_EPOCH_ENTER(et);
        retval = if_foreach_addr_type(dev, addr->sa_family,
            ipoib_match_dev_addr_cb, __DECONST(void *, addr));
        NET_EPOCH_EXIT(et);

        return (retval);
}

/*
 * ipoib_match_gid_pkey_addr - returns the number of IPoIB netdevs on
 * top a given ipoib device matching a pkey_index and address, if one
 * exists.
 *
 * @found_net_dev: contains a matching net_device if the return value
 * >= 1, with a reference held.
 */
static int
ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
    const union ib_gid *gid, u16 pkey_index, const struct sockaddr *addr,
    if_t *found_net_dev)
{
        struct ipoib_dev_priv *child_priv;
        int matches = 0;

        if (priv->pkey_index == pkey_index &&
            (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
                if (addr == NULL || ipoib_match_dev_addr(addr, priv->dev) != 0) {
                        if (*found_net_dev == NULL) {
                                if_t net_dev;

                                if (priv->parent != NULL)
                                        net_dev = priv->parent;
                                else
                                        net_dev = priv->dev;
                                *found_net_dev = net_dev;
                                dev_hold(net_dev);
                        }
                        matches++;
                }
        }

        /* Check child interfaces */
        mutex_lock(&priv->vlan_mutex);
        list_for_each_entry(child_priv, &priv->child_intfs, list) {
                matches += ipoib_match_gid_pkey_addr(child_priv, gid,
                    pkey_index, addr, found_net_dev);
                if (matches > 1)
                        break;
        }
        mutex_unlock(&priv->vlan_mutex);

        return matches;
}

/*
 * __ipoib_get_net_dev_by_params - returns the number of matching
 * net_devs found (between 0 and 2). Also return the matching
 * net_device in the @net_dev parameter, holding a reference to the
 * net_device, if the number of matches >= 1
 */
static int
__ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
    u16 pkey_index, const union ib_gid *gid,
    const struct sockaddr *addr, if_t *net_dev)
{
        struct ipoib_dev_priv *priv;
        int matches = 0;

        *net_dev = NULL;

        list_for_each_entry(priv, dev_list, list) {
                if (priv->port != port)
                        continue;

                matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
                    addr, net_dev);

                if (matches > 1)
                        break;
        }

        return matches;
}

static if_t
ipoib_get_net_dev_by_params(struct ib_device *dev, u8 port, u16 pkey,
    const union ib_gid *gid, const struct sockaddr *addr, void *client_data)
{
        if_t net_dev;
        struct list_head *dev_list = client_data;
        u16 pkey_index;
        int matches;
        int ret;

        if (!rdma_protocol_ib(dev, port))
                return NULL;

        ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
        if (ret)
                return NULL;

        if (!dev_list)
                return NULL;

        /* See if we can find a unique device matching the L2 parameters */
        matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
                                                gid, NULL, &net_dev);

        switch (matches) {
        case 0:
                return NULL;
        case 1:
                return net_dev;
        }

        dev_put(net_dev);

        /* Couldn't find a unique device with L2 parameters only. Use L3
         * address to uniquely match the net device */
        matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
                                                gid, addr, &net_dev);
        switch (matches) {
        case 0:
                return NULL;
        default:
                dev_warn_ratelimited(&dev->dev,
                                     "duplicate IP address detected\n");
                /* Fall through */
        case 1:
                return net_dev;
        }
}

static void
ipoib_config_vlan(void *arg, if_t ifp, uint16_t vtag)
{
        struct ipoib_dev_priv *parent;
        struct ipoib_dev_priv *priv;
        struct epoch_tracker et;
        if_t dev;
        uint16_t pkey;
        int error;

        if (if_gettype(ifp) != IFT_INFINIBAND)
                return;
        NET_EPOCH_ENTER(et);
        dev = VLAN_DEVAT(ifp, vtag);
        NET_EPOCH_EXIT(et);
        if (dev == NULL)
                return;
        priv = NULL;
        error = 0;
        parent = if_getsoftc(ifp);
        /* We only support 15 bits of pkey. */
        if (vtag & 0x8000)
                return;
        pkey = vtag | 0x8000;   /* Set full membership bit. */
        if (pkey == parent->pkey)
                return;
        /* Check for dups */
        mutex_lock(&parent->vlan_mutex);
        list_for_each_entry(priv, &parent->child_intfs, list) {
                if (priv->pkey == pkey) {
                        priv = NULL;
                        error = EBUSY;
                        goto out;
                }
        }
        priv = ipoib_priv_alloc();
        priv->dev = dev;
        priv->max_ib_mtu = parent->max_ib_mtu;
        priv->mcast_mtu = priv->admin_mtu = if_getmtu(parent->dev);
        set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
        error = ipoib_set_dev_features(priv, parent->ca);
        if (error)
                goto out;
        priv->pkey = pkey;
        priv->broadcastaddr[8] = pkey >> 8;
        priv->broadcastaddr[9] = pkey & 0xff;
        if_setbroadcastaddr(dev, priv->broadcastaddr);
        error = ipoib_dev_init(priv, parent->ca, parent->port);
        if (error)
                goto out;
        priv->parent = parent->dev;
        list_add_tail(&priv->list, &parent->child_intfs);
        VLAN_SETCOOKIE(dev, priv);
        if_setstartfn(dev, ipoib_vlan_start);
        if_setdrvflagbits(dev, 0, IFF_DRV_RUNNING);
        if_setifheaderlen(dev, IPOIB_HEADER_LEN);
        if (if_getdrvflags(ifp) & IFF_DRV_RUNNING)
                ipoib_open(priv);
        mutex_unlock(&parent->vlan_mutex);
        return;
out:
        mutex_unlock(&parent->vlan_mutex);
        if (priv)
                free(priv, M_TEMP);
        if (error)
                ipoib_warn(parent,
                    "failed to initialize subinterface: device %s, port %d vtag 0x%X",
                    parent->ca->name, parent->port, vtag);
        return;
}

static void
ipoib_unconfig_vlan(void *arg, if_t ifp, uint16_t vtag)
{
        struct ipoib_dev_priv *parent;
        struct ipoib_dev_priv *priv;
        struct epoch_tracker et;
        if_t dev;
        uint16_t pkey;

        if (if_gettype(ifp) != IFT_INFINIBAND)
                return;

        NET_EPOCH_ENTER(et);
        dev = VLAN_DEVAT(ifp, vtag);
        NET_EPOCH_EXIT(et);
        if (dev)
                VLAN_SETCOOKIE(dev, NULL);
        pkey = vtag | 0x8000;
        parent = if_getsoftc(ifp);
        mutex_lock(&parent->vlan_mutex);
        list_for_each_entry(priv, &parent->child_intfs, list) {
                if (priv->pkey == pkey) {
                        ipoib_dev_cleanup(priv);
                        list_del(&priv->list);
                        break;
                }
        }
        mutex_unlock(&parent->vlan_mutex);
}

eventhandler_tag ipoib_vlan_attach;
eventhandler_tag ipoib_vlan_detach;

static int __init
ipoib_init_module(void)
{
        int ret;

        ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
        ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
        ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);

        ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
        ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
        ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
                                                     IPOIB_MIN_QUEUE_SIZE));
#ifdef CONFIG_INFINIBAND_IPOIB_CM
        ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
#endif

        ipoib_vlan_attach = EVENTHANDLER_REGISTER(vlan_config,
                ipoib_config_vlan, NULL, EVENTHANDLER_PRI_FIRST);
        ipoib_vlan_detach = EVENTHANDLER_REGISTER(vlan_unconfig,
                ipoib_unconfig_vlan, NULL, EVENTHANDLER_PRI_FIRST);

        /*
         * We create our own workqueue mainly because we want to be
         * able to flush it when devices are being removed.  We can't
         * use schedule_work()/flush_scheduled_work() because both
         * unregister_netdev() and linkwatch_event take the rtnl lock,
         * so flush_scheduled_work() can deadlock during device
         * removal.
         */
        ipoib_workqueue = create_singlethread_workqueue("ipoib");
        if (!ipoib_workqueue) {
                ret = -ENOMEM;
                goto err_fs;
        }

        ib_sa_register_client(&ipoib_sa_client);

        ret = ib_register_client(&ipoib_client);
        if (ret)
                goto err_sa;

        return 0;

err_sa:
        ib_sa_unregister_client(&ipoib_sa_client);
        destroy_workqueue(ipoib_workqueue);

err_fs:
        return ret;
}

static void __exit
ipoib_cleanup_module(void)
{

        EVENTHANDLER_DEREGISTER(vlan_config, ipoib_vlan_attach);
        EVENTHANDLER_DEREGISTER(vlan_unconfig, ipoib_vlan_detach);
        ib_unregister_client(&ipoib_client);
        ib_sa_unregister_client(&ipoib_sa_client);
        destroy_workqueue(ipoib_workqueue);
}
module_init_order(ipoib_init_module, SI_ORDER_FIFTH);
module_exit_order(ipoib_cleanup_module, SI_ORDER_FIFTH);

static int
ipoib_evhand(module_t mod, int event, void *arg)
{
        return (0);
}

static moduledata_t ipoib_mod = {
        .name = "ipoib",
        .evhand = ipoib_evhand,
};

DECLARE_MODULE(ipoib, ipoib_mod, SI_SUB_LAST, SI_ORDER_ANY);
MODULE_DEPEND(ipoib, ibcore, 1, 1, 1);
MODULE_DEPEND(ipoib, if_infiniband, 1, 1, 1);
MODULE_DEPEND(ipoib, linuxkpi, 1, 1, 1);