/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Definitions for IB environment
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Ursula Braun <Ursula Braun@linux.vnet.ibm.com>
 */

#ifndef _SMC_IB_H
#define _SMC_IB_H

#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <rdma/ib_verbs.h>
#include <net/smc.h>

#define SMC_MAX_PORTS                   2       /* Max # of ports */
#define SMC_GID_SIZE                    sizeof(union ib_gid)

#define SMC_IB_MAX_SEND_SGE             2

struct smc_ib_devices {                 /* list of smc ib devices definition */
        struct list_head        list;
        struct mutex            mutex;  /* protects list of smc ib devices */
};

extern struct smc_ib_devices    smc_ib_devices; /* list of smc ib devices */
extern struct smc_lgr_list smc_lgr_list; /* list of linkgroups */

struct smc_ib_device {                          /* ib-device infos for smc */
        struct list_head        list;
        struct ib_device        *ibdev;
        struct ib_port_attr     pattr[SMC_MAX_PORTS];   /* ib dev. port attrs */
        struct ib_event_handler event_handler;  /* global ib_event handler */
        struct ib_cq            *roce_cq_send;  /* send completion queue */
        struct ib_cq            *roce_cq_recv;  /* recv completion queue */
        struct tasklet_struct   send_tasklet;   /* called by send cq handler */
        struct tasklet_struct   recv_tasklet;   /* called by recv cq handler */
        char                    mac[SMC_MAX_PORTS][ETH_ALEN];
                                                /* mac address per port*/
        u8                      pnetid[SMC_MAX_PORTS][SMC_MAX_PNETID_LEN];
                                                /* pnetid per port */
        bool                    pnetid_by_user[SMC_MAX_PORTS];
                                                /* pnetid defined by user? */
        u8                      initialized : 1; /* ib dev CQ, evthdl done */
        struct work_struct      port_event_work;
        unsigned long           port_event_mask;
        DECLARE_BITMAP(ports_going_away, SMC_MAX_PORTS);
        atomic_t                lnk_cnt;        /* number of links on ibdev */
        wait_queue_head_t       lnks_deleted;   /* wait 4 removal of all links*/
        struct mutex            mutex;          /* protect dev setup+cleanup */
        atomic_t                lnk_cnt_by_port[SMC_MAX_PORTS];
                                                /* number of links per port */
        int                     ndev_ifidx[SMC_MAX_PORTS]; /* ndev if indexes */
};

static inline __be32 smc_ib_gid_to_ipv4(u8 gid[SMC_GID_SIZE])
{
        struct in6_addr *addr6 = (struct in6_addr *)gid;

        if (ipv6_addr_v4mapped(addr6) ||
            !(addr6->s6_addr32[0] | addr6->s6_addr32[1] | addr6->s6_addr32[2]))
                return addr6->s6_addr32[3];
        return cpu_to_be32(INADDR_NONE);
}

static inline struct net *smc_ib_net(struct smc_ib_device *smcibdev)
{
        if (smcibdev && smcibdev->ibdev)
                return read_pnet(&smcibdev->ibdev->coredev.rdma_net);
        return NULL;
}

struct smc_init_info_smcrv2;
struct smc_buf_desc;
struct smc_link;

void smc_ib_ndev_change(struct net_device *ndev, unsigned long event);
int smc_ib_register_client(void) __init;
void smc_ib_unregister_client(void);
bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
int smc_ib_buf_map_sg(struct smc_link *lnk,
                      struct smc_buf_desc *buf_slot,
                      enum dma_data_direction data_direction);
void smc_ib_buf_unmap_sg(struct smc_link *lnk,
                         struct smc_buf_desc *buf_slot,
                         enum dma_data_direction data_direction);
void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
int smc_ib_create_protection_domain(struct smc_link *lnk);
void smc_ib_destroy_queue_pair(struct smc_link *lnk);
int smc_ib_create_queue_pair(struct smc_link *lnk);
int smc_ib_ready_link(struct smc_link *lnk);
int smc_ib_modify_qp_rts(struct smc_link *lnk);
int smc_ib_modify_qp_error(struct smc_link *lnk);
long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev);
int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
                             struct smc_buf_desc *buf_slot, u8 link_idx);
void smc_ib_put_memory_region(struct ib_mr *mr);
bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
                            struct smc_buf_desc *buf_slot);
void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
                            struct smc_buf_desc *buf_slot,
                            enum dma_data_direction data_direction);
void smc_ib_sync_sg_for_device(struct smc_link *lnk,
                               struct smc_buf_desc *buf_slot,
                               enum dma_data_direction data_direction);
int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
                         unsigned short vlan_id, u8 gid[], u8 *sgid_index,
                         struct smc_init_info_smcrv2 *smcrv2);
int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr,
                      u8 nexthop_mac[], u8 *uses_gateway);
bool smc_ib_is_valid_local_systemid(void);
int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
#endif