[mirror_ubuntu-bionic-kernel.git] / drivers / infiniband / core / cma.c

/*
 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
 * Copyright (c) 2005-2006 Intel Corporation.  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 <linux/completion.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/igmp.h>
#include <linux/idr.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/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"

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

#define CMA_CM_RESPONSE_TIMEOUT 20
#define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
#define CMA_MAX_CM_RETRIES 15
#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
#define CMA_IBOE_PACKET_LIFETIME 18
#define CMA_PREFERRED_ROCE_GID_TYPE (1 << 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",
};

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);

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;
}
EXPORT_SYMBOL(rdma_is_consumer_reject);

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);

static void 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 struct rdma_addr_client addr_client;
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
static struct workqueue_struct *cma_wq;
static unsigned int cma_pernet_id;

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

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

static struct idr *cma_pernet_idr(struct net *net, enum rdma_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 cma_device {
        struct list_head        list;
        struct ib_device        *device;
        struct completion       comp;
        atomic_t                refcount;
        struct list_head        id_list;
        enum ib_gid_type        *default_gid_type;
        u8                      *default_roce_tos;
};

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

struct class_port_info_context {
        struct ib_class_port_info       *class_port_info;
        struct ib_device                *device;
        struct completion               done;
        struct ib_sa_query              *sa_query;
        u8                              port_num;
};

static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
                        struct rdma_bind_list *bind_list, int snum)
{
        struct idr *idr = cma_pernet_idr(net, ps);

        return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
}

static struct rdma_bind_list *cma_ps_find(struct net *net,
                                          enum rdma_port_space ps, int snum)
{
        struct idr *idr = cma_pernet_idr(net, ps);

        return idr_find(idr, snum);
}

static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
{
        struct idr *idr = cma_pernet_idr(net, ps);

        idr_remove(idr, snum);
}

enum {
        CMA_OPTION_AFONLY,
};

void cma_ref_dev(struct cma_device *cma_dev)
{
        atomic_inc(&cma_dev->refcount);
}

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_ref_dev(found_cma_dev);
        mutex_unlock(&lock);
        return found_cma_dev;
}

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

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

        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, unsigned int 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, unsigned int 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 rdma_id_private {
        struct rdma_cm_id       id;

        struct rdma_bind_list   *bind_list;
        struct hlist_node       node;
        struct list_head        list; /* listen_any_list or cma_device.list */
        struct list_head        listen_list; /* per device listens */
        struct cma_device       *cma_dev;
        struct list_head        mc_list;

        int                     internal_id;
        enum rdma_cm_state      state;
        spinlock_t              lock;
        struct mutex            qp_mutex;

        struct completion       comp;
        atomic_t                refcount;
        struct mutex            handler_mutex;

        int                     backlog;
        int                     timeout_ms;
        struct ib_sa_query      *query;
        int                     query_id;
        union {
                struct ib_cm_id *ib;
                struct iw_cm_id *iw;
        } cm_id;

        u32                     seq_num;
        u32                     qkey;
        u32                     qp_num;
        pid_t                   owner;
        u32                     options;
        u8                      srq;
        u8                      tos;
        bool                    tos_set;
        u8                      reuseaddr;
        u8                      afonly;
        enum ib_gid_type        gid_type;
};

struct cma_multicast {
        struct rdma_id_private *id_priv;
        union {
                struct ib_sa_multicast *ib;
        } multicast;
        struct list_head        list;
        void                    *context;
        struct sockaddr_storage addr;
        struct kref             mcref;
        bool                    igmp_joined;
        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;
};

struct cma_ndev_work {
        struct work_struct      work;
        struct rdma_id_private  *id;
        struct rdma_cm_event    event;
};

struct iboe_mcast_work {
        struct work_struct       work;
        struct rdma_id_private  *id;
        struct cma_multicast    *mc;
};

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 ib_device *device;
        int port;
        union ib_gid local_gid;
        __be64 service_id;
        u16 pkey;
        bool has_gid:1;
};

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

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

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;

        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 enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
                                   enum rdma_cm_state exch)
{
        unsigned long flags;
        enum rdma_cm_state old;

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

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

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

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 void _cma_attach_to_dev(struct rdma_id_private *id_priv,
                               struct cma_device *cma_dev)
{
        cma_ref_dev(cma_dev);
        id_priv->cma_dev = cma_dev;
        id_priv->gid_type = 0;
        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->list, &cma_dev->id_list);
}

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)];
}

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

static inline void release_mc(struct kref *kref)
{
        struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);

        kfree(mc->multicast.ib);
        kfree(mc);
}

static void cma_release_dev(struct rdma_id_private *id_priv)
{
        mutex_lock(&lock);
        list_del(&id_priv->list);
        cma_deref_dev(id_priv->cma_dev);
        id_priv->cma_dev = NULL;
        mutex_unlock(&lock);
}

static inline 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 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_qkey(struct rdma_id_private *id_priv, u32 qkey)
{
        struct ib_sa_mcmember_rec rec;
        int ret = 0;

        if (id_priv->qkey) {
                if (qkey && id_priv->qkey != qkey)
                        return -EINVAL;
                return 0;
        }

        if (qkey) {
                id_priv->qkey = qkey;
                return 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 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, NULL);
        } else {
                cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
                ret = 0;
        }

        return ret;
}

static inline int cma_validate_port(struct ib_device *device, u8 port,
                                    enum ib_gid_type gid_type,
                                      union ib_gid *gid, int dev_type,
                                      int bound_if_index)
{
        int ret = -ENODEV;
        struct net_device *ndev = NULL;

        if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
                return ret;

        if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
                return ret;

        if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port))
                ndev = dev_get_by_index(&init_net, bound_if_index);
        else
                gid_type = IB_GID_TYPE_IB;


        ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
                                         ndev, NULL);

        if (ndev)
                dev_put(ndev);

        return ret;
}

static int cma_acquire_dev(struct rdma_id_private *id_priv,
                           struct rdma_id_private *listen_id_priv)
{
        struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
        struct cma_device *cma_dev;
        union ib_gid gid, iboe_gid, *gidp;
        int ret = -ENODEV;
        u8 port;

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

        mutex_lock(&lock);
        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);

        if (listen_id_priv) {
                cma_dev = listen_id_priv->cma_dev;
                port = listen_id_priv->id.port_num;
                gidp = rdma_protocol_roce(cma_dev->device, port) ?
                       &iboe_gid : &gid;

                ret = cma_validate_port(cma_dev->device, port,
                                        rdma_protocol_ib(cma_dev->device, port) ?
                                        IB_GID_TYPE_IB :
                                        listen_id_priv->gid_type, gidp,
                                        dev_addr->dev_type,
                                        dev_addr->bound_dev_if);
                if (!ret) {
                        id_priv->id.port_num = port;
                        goto out;
                }
        }

        list_for_each_entry(cma_dev, &dev_list, list) {
                for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
                        if (listen_id_priv &&
                            listen_id_priv->cma_dev == cma_dev &&
                            listen_id_priv->id.port_num == port)
                                continue;

                        gidp = rdma_protocol_roce(cma_dev->device, port) ?
                               &iboe_gid : &gid;

                        ret = cma_validate_port(cma_dev->device, port,
                                                rdma_protocol_ib(cma_dev->device, port) ?
                                                IB_GID_TYPE_IB :
                                                cma_dev->default_gid_type[port - 1],
                                                gidp, dev_addr->dev_type,
                                                dev_addr->bound_dev_if);
                        if (!ret) {
                                id_priv->id.port_num = port;
                                goto out;
                        }
                }
        }

out:
        if (!ret)
                cma_attach_to_dev(id_priv, cma_dev);

        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;
        u16 pkey, index;
        u8 p;
        enum ib_port_state port_state;
        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);

        list_for_each_entry(cur_dev, &dev_list, list) {
                for (p = 1; p <= cur_dev->device->phys_port_cnt; ++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; !ib_get_cached_gid(cur_dev->device, p, i,
                                                       &gid, NULL);
                             i++) {
                                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;
                                }
                        }
                }
        }

        if (!cma_dev)
                return -ENODEV;

found:
        cma_attach_to_dev(id_priv, cma_dev);
        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_deref_id(struct rdma_id_private *id_priv)
{
        if (atomic_dec_and_test(&id_priv->refcount))
                complete(&id_priv->comp);
}

struct rdma_cm_id *rdma_create_id(struct net *net,
                                  rdma_cm_event_handler event_handler,
                                  void *context, enum rdma_port_space ps,
                                  enum ib_qp_type qp_type)
{
        struct rdma_id_private *id_priv;

        id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
        if (!id_priv)
                return ERR_PTR(-ENOMEM);

        id_priv->owner = task_pid_nr(current);
        id_priv->state = RDMA_CM_IDLE;
        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;
        spin_lock_init(&id_priv->lock);
        mutex_init(&id_priv->qp_mutex);
        init_completion(&id_priv->comp);
        atomic_set(&id_priv->refcount, 1);
        mutex_init(&id_priv->handler_mutex);
        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);

        return &id_priv->id;
}
EXPORT_SYMBOL(rdma_create_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)
                return -EINVAL;

        qp_init_attr->port_num = id->port_num;
        qp = ib_create_qp(pd, qp_init_attr);
        if (IS_ERR(qp))
                return PTR_ERR(qp);

        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 err;

        id->qp = qp;
        id_priv->qp_num = qp->qp_num;
        id_priv->srq = (qp->srq != NULL);
        return 0;
err:
        ib_destroy_qp(qp);
        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);
        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;
        union ib_gid sgid;

        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;

        ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
                           rdma_ah_read_grh(&qp_attr.ah_attr)->sgid_index,
                           &sgid, NULL);
        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_qkey(id_priv, 0);
                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;

        return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);

static inline int cma_zero_addr(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 0;
        }
}

static inline int cma_loopback_addr(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 0;
        }
}

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

static int cma_addr_cmp(struct sockaddr *src, 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:
                return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
                                     &((struct sockaddr_in6 *) dst)->sin6_addr);
        default:
                return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
                                   &((struct sockaddr_ib *) dst)->sib_addr);
        }
}

static __be16 cma_port(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(struct sockaddr *addr)
{
        return !cma_port(addr);
}

static void cma_save_ib_info(struct sockaddr *src_addr,
                             struct sockaddr *dst_addr,
                             struct rdma_cm_id *listen_id,
                             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,
                            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,
                             struct rdma_cm_id *listen_id,
                             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_iif = 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,
                                         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 *cma_get_net_dev(struct ib_cm_event *ib_event,
                                          const struct cma_req_info *req)
{
        struct sockaddr_storage listen_addr_storage, src_addr_storage;
        struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
                        *src_addr = (struct sockaddr *)&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);

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

        if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
                dev_put(net_dev);
                return ERR_PTR(-EHOSTUNREACH);
        }

        return net_dev;
}

static enum rdma_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_dev_port(struct ib_device *device, int port_num)
{
        enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
        enum rdma_transport_type transport =
                rdma_node_get_transport(device->node_type);

        return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
}

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

        return cma_protocol_roce_dev_port(device, port_num);
}

static bool cma_match_net_dev(const struct rdma_cm_id *id,
                              const struct net_device *net_dev,
                              u8 port_num)
{
        const struct rdma_addr *addr = &id->route.addr;

        if (!net_dev)
                /* This request is an AF_IB request or a RoCE request */
                return (!id->port_num || id->port_num == port_num) &&
                       (addr->src_addr.ss_family == AF_IB ||
                        cma_protocol_roce_dev_port(id->device, port_num));

        return !addr->dev_addr.bound_dev_if ||
               (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
                addr->dev_addr.bound_dev_if == net_dev->ifindex);
}

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;

        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->port))
                                return id_priv;
                        list_for_each_entry(id_priv_dev,
                                            &id_priv->listen_list,
                                            listen_list) {
                                if (id_priv_dev->id.device == cm_id->device &&
                                    cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
                                        return id_priv_dev;
                        }
                }
        }

        return ERR_PTR(-EINVAL);
}

static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
                                                 struct ib_cm_event *ib_event,
                                                 struct net_device **net_dev)
{
        struct cma_req_info req;
        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 if (cma_protocol_roce_dev_port(req.device, req.port)) {
                        /* TODO find the net dev matching the request parameters
                         * through the RoCE GID table */
                        *net_dev = NULL;
                } else {
                        return ERR_CAST(*net_dev);
                }
        }

        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);
        if (IS_ERR(id_priv) && *net_dev) {
                dev_put(*net_dev);
                *net_dev = NULL;
        }

        return id_priv;
}

static inline int 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;

        /*
         * Remove from listen_any_list to prevent added devices from spawning
         * additional listen requests.
         */
        mutex_lock(&lock);
        list_del(&id_priv->list);

        while (!list_empty(&id_priv->listen_list)) {
                dev_id_priv = list_entry(id_priv->listen_list.next,
                                         struct rdma_id_private, listen_list);
                /* sync with device removal to avoid duplicate destruction */
                list_del_init(&dev_id_priv->list);
                list_del(&dev_id_priv->listen_list);
                mutex_unlock(&lock);

                rdma_destroy_id(&dev_id_priv->id);
                mutex_lock(&lock);
        }
        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:
                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 cma_leave_mc_groups(struct rdma_id_private *id_priv)
{
        struct cma_multicast *mc;

        while (!list_empty(&id_priv->mc_list)) {
                mc = container_of(id_priv->mc_list.next,
                                  struct cma_multicast, list);
                list_del(&mc->list);
                if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
                                      id_priv->id.port_num)) {
                        ib_sa_free_multicast(mc->multicast.ib);
                        kfree(mc);
                } else {
                        if (mc->igmp_joined) {
                                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(&init_net,
                                                                dev_addr->bound_dev_if);
                                if (ndev) {
                                        cma_igmp_send(ndev,
                                                      &mc->multicast.ib->rec.mgid,
                                                      false);
                                        dev_put(ndev);
                                }
                        }
                        kref_put(&mc->mcref, release_mc);
                }
        }
}

void rdma_destroy_id(struct rdma_cm_id *id)
{
        struct rdma_id_private *id_priv;
        enum rdma_cm_state state;

        id_priv = container_of(id, struct rdma_id_private, id);
        state = cma_exch(id_priv, RDMA_CM_DESTROYING);
        cma_cancel_operation(id_priv, state);

        /*
         * Wait for any active callback to finish.  New callbacks will find
         * the id_priv state set to destroying and abort.
         */
        mutex_lock(&id_priv->handler_mutex);
        mutex_unlock(&id_priv->handler_mutex);

        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_deref_id(id_priv);
        wait_for_completion(&id_priv->comp);

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

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

        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);
        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,
                                   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;
}

static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
        struct rdma_id_private *id_priv = cm_id->context;
        struct rdma_cm_event event;
        int ret = 0;

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

        memset(&event, 0, sizeof event);
        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 (cma_comp(id_priv, RDMA_CM_CONNECT) &&
                    (id_priv->id.qp_type != IB_QPT_UD))
                        ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
                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; /* fall through */
        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 = id_priv->id.event_handler(&id_priv->id, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
                rdma_destroy_id(&id_priv->id);
                return ret;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        return ret;
}

static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
                                               struct ib_cm_event *ib_event,
                                               struct net_device *net_dev)
{
        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;

        id = 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);
        if (IS_ERR(id))
                return NULL;

        id_priv = container_of(id, struct rdma_id_private, 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_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
        rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
                               GFP_KERNEL);
        if (!rt->path_rec)
                goto err;

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

        if (net_dev) {
                ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
                if (ret)
                        goto err;
        } 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_new_udp_id(struct rdma_cm_id *listen_id,
                                              struct ib_cm_event *ib_event,
                                              struct net_device *net_dev)
{
        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;

        id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
                            listen_id->ps, IB_QPT_UD);
        if (IS_ERR(id))
                return NULL;

        id_priv = container_of(id, struct rdma_id_private, 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) {
                ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
                if (ret)
                        goto err;
        } 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,
                                   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;
}

static int cma_check_req_qp_type(struct rdma_cm_id *id, 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_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
        struct rdma_id_private *listen_id, *conn_id = NULL;
        struct rdma_cm_event event;
        struct net_device *net_dev;
        int offset, ret;

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

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

        mutex_lock(&listen_id->handler_mutex);
        if (listen_id->state != RDMA_CM_LISTEN) {
                ret = -ECONNABORTED;
                goto err1;
        }

        memset(&event, 0, sizeof event);
        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_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_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 err1;
        }

        mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
        ret = cma_acquire_dev(conn_id, listen_id);
        if (ret)
                goto err2;

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

        /*
         * Protect against the user destroying conn_id from another thread
         * until we're done accessing it.
         */
        atomic_inc(&conn_id->refcount);
        ret = conn_id->id.event_handler(&conn_id->id, &event);
        if (ret)
                goto err3;
        /*
         * Acquire mutex to prevent user executing rdma_destroy_id()
         * while we're accessing the cm_id.
         */
        mutex_lock(&lock);
        if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
            (conn_id->id.qp_type != IB_QPT_UD))
                ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
        mutex_unlock(&lock);
        mutex_unlock(&conn_id->handler_mutex);
        mutex_unlock(&listen_id->handler_mutex);
        cma_deref_id(conn_id);
        if (net_dev)
                dev_put(net_dev);
        return 0;

err3:
        cma_deref_id(conn_id);
        /* Destroy the CM ID by returning a non-zero value. */
        conn_id->cm_id.ib = NULL;
err2:
        cma_exch(conn_id, RDMA_CM_DESTROYING);
        mutex_unlock(&conn_id->handler_mutex);
err1:
        mutex_unlock(&listen_id->handler_mutex);
        if (conn_id)
                rdma_destroy_id(&conn_id->id);

net_dev_put:
        if (net_dev)
                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);

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 (id_priv->state != RDMA_CM_CONNECT)
                goto out;

        memset(&event, 0, sizeof event);
        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:
                BUG_ON(1);
        }

        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 = id_priv->id.event_handler(&id_priv->id, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.iw = NULL;
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
                rdma_destroy_id(&id_priv->id);
                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_cm_id *new_cm_id;
        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;

        listen_id = cm_id->context;

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

        /* Create a new RDMA id for the new IW CM ID */
        new_cm_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);
        if (IS_ERR(new_cm_id)) {
                ret = -ENOMEM;
                goto out;
        }
        conn_id = container_of(new_cm_id, struct rdma_id_private, id);
        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, NULL);
        if (ret) {
                mutex_unlock(&conn_id->handler_mutex);
                rdma_destroy_id(new_cm_id);
                goto out;
        }

        ret = cma_acquire_dev(conn_id, listen_id);
        if (ret) {
                mutex_unlock(&conn_id->handler_mutex);
                rdma_destroy_id(new_cm_id);
                goto out;
        }

        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));

        memset(&event, 0, sizeof event);
        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;

        /*
         * Protect against the user destroying conn_id from another thread
         * until we're done accessing it.
         */
        atomic_inc(&conn_id->refcount);
        ret = conn_id->id.event_handler(&conn_id->id, &event);
        if (ret) {
                /* User wants to destroy the CM ID */
                conn_id->cm_id.iw = NULL;
                cma_exch(conn_id, RDMA_CM_DESTROYING);
                mutex_unlock(&conn_id->handler_mutex);
                cma_deref_id(conn_id);
                rdma_destroy_id(&conn_id->id);
                goto out;
        }

        mutex_unlock(&conn_id->handler_mutex);
        cma_deref_id(conn_id);

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_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);

        id->tos = id_priv->tos;
        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;

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

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

        if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
                return;

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

        dev_id_priv = container_of(id, struct rdma_id_private, id);

        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);
        list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
        atomic_inc(&id_priv->refcount);
        dev_id_priv->internal_id = 1;
        dev_id_priv->afonly = id_priv->afonly;

        ret = rdma_listen(id, id_priv->backlog);
        if (ret)
                pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
                        ret, cma_dev->device->name);
}

static void cma_listen_on_all(struct rdma_id_private *id_priv)
{
        struct cma_device *cma_dev;

        mutex_lock(&lock);
        list_add_tail(&id_priv->list, &listen_any_list);
        list_for_each_entry(cma_dev, &dev_list, list)
                cma_listen_on_dev(id_priv, cma_dev);
        mutex_unlock(&lock);
}

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);
        id_priv->tos = (u8) tos;
        id_priv->tos_set = true;
}
EXPORT_SYMBOL(rdma_set_service_type);

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

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

        if (!status) {
                route->num_paths = 1;
                *route->path_rec = *path_rec;
        } else {
                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, int 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_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;
        int destroy = 0;

        mutex_lock(&id_priv->handler_mutex);
        if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
                goto out;

        if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                destroy = 1;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        cma_deref_id(id_priv);
        if (destroy)
                rdma_destroy_id(&id_priv->id);
        kfree(work);
}

static void cma_ndev_work_handler(struct work_struct *_work)
{
        struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
        struct rdma_id_private *id_priv = work->id;
        int destroy = 0;

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

        if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                destroy = 1;
        }

out:
        mutex_unlock(&id_priv->handler_mutex);
        cma_deref_id(id_priv);
        if (destroy)
                rdma_destroy_id(&id_priv->id);
        kfree(work);
}

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

        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (!work)
                return -ENOMEM;

        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;

        route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
        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;
}

int rdma_set_ib_paths(struct rdma_cm_id *id,
                      struct sa_path_rec *path_rec, int num_paths)
{
        struct rdma_id_private *id_priv;
        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 * num_paths,
                                     GFP_KERNEL);
        if (!id->route.path_rec) {
                ret = -ENOMEM;
                goto err;
        }

        id->route.num_paths = num_paths;
        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
        return ret;
}
EXPORT_SYMBOL(rdma_set_ib_paths);

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

        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (!work)
                return -ENOMEM;

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

static int iboe_tos_to_sl(struct net_device *ndev, int tos)
{
        int prio;
        struct net_device *dev;

        prio = rt_tos2priority(tos);
        dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
        if (dev->num_tc)
                return netdev_get_prio_tc_map(dev, prio);

#if IS_ENABLED(CONFIG_VLAN_8021Q)
        if (is_vlan_dev(ndev))
                return (vlan_dev_get_egress_qos_mask(ndev, prio) &
                        VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
#endif
        return 0;
}

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;
}

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 = NULL;
        enum ib_gid_type gid_type = IB_GID_TYPE_IB;
        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 = id_priv->tos_set ? id_priv->tos : default_roce_tos;


        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (!work)
                return -ENOMEM;

        work->id = id_priv;
        INIT_WORK(&work->work, cma_work_handler);

        route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
        if (!route->path_rec) {
                ret = -ENOMEM;
                goto err1;
        }

        route->num_paths = 1;

        if (addr->dev_addr.bound_dev_if) {
                unsigned long supported_gids;

                ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
                if (!ndev) {
                        ret = -ENODEV;
                        goto err2;
                }

                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);
                route->path_rec->rec_type =
                        sa_conv_gid_to_pathrec_type(gid_type);
                sa_path_set_ndev(route->path_rec, &init_net);
                sa_path_set_ifindex(route->path_rec, ndev->ifindex);
        }
        if (!ndev) {
                ret = -ENODEV;
                goto err2;
        }

        sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);

        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);

        /* 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);

        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 = iboe_get_rate(ndev);
        dev_put(ndev);
        route->path_rec->packet_life_time_selector = IB_SA_EQ;
        route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
        if (!route->path_rec->mtu) {
                ret = -EINVAL;
                goto err2;
        }

        work->old_state = RDMA_CM_ROUTE_QUERY;
        work->new_state = RDMA_CM_ROUTE_RESOLVED;
        work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
        work->event.status = 0;

        queue_work(cma_wq, &work->work);

        return 0;

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

int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
{
        struct rdma_id_private *id_priv;
        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_QUERY))
                return -EINVAL;

        atomic_inc(&id_priv->refcount);
        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);
        else if (rdma_protocol_iwarp(id->device, id->port_num))
                ret = cma_resolve_iw_route(id_priv, timeout_ms);
        else
                ret = -ENOSYS;

        if (ret)
                goto err;

        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
        cma_deref_id(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;
        u16 pkey;
        int ret;
        u8 p;

        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;

                for (p = 1; p <= cur_dev->device->phys_port_cnt; ++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 = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
        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);
        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;

        memset(&event, 0, sizeof event);
        mutex_lock(&id_priv->handler_mutex);
        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
                           RDMA_CM_ADDR_RESOLVED))
                goto out;

        memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
        if (!status && !id_priv->cma_dev) {
                status = cma_acquire_dev(id_priv, NULL);
                if (status)
                        pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
                                             status);
        } else {
                pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
        }

        if (status) {
                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 (id_priv->id.event_handler(&id_priv->id, &event)) {
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
                cma_deref_id(id_priv);
                rdma_destroy_id(&id_priv->id);
                return;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        cma_deref_id(id_priv);
}

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

        work = kzalloc(sizeof *work, GFP_KERNEL);
        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);

        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);
        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(sizeof *work, GFP_KERNEL);
        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));

        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);
        return 0;
err:
        kfree(work);
        return ret;
}

static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                         struct sockaddr *dst_addr)
{
        if (!src_addr || !src_addr->sa_family) {
                src_addr = (struct sockaddr *) &id->route.addr.src_addr;
                src_addr->sa_family = dst_addr->sa_family;
                if (IS_ENABLED(CONFIG_IPV6) &&
                    dst_addr->sa_family == AF_INET6) {
                        struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
                        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 *) src_addr)->sib_pkey =
                                ((struct sockaddr_ib *) dst_addr)->sib_pkey;
                }
        }
        return rdma_bind_addr(id, src_addr);
}

int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
                      struct sockaddr *dst_addr, int timeout_ms)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
        if (id_priv->state == RDMA_CM_IDLE) {
                ret = cma_bind_addr(id, src_addr, dst_addr);
                if (ret) {
                        memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
                        return ret;
                }
        }

        if (cma_family(id_priv) != dst_addr->sa_family) {
                memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
                return -EINVAL;
        }

        if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
                memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
                return -EINVAL;
        }

        atomic_inc(&id_priv->refcount);
        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 {
                        ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
                                              dst_addr, &id->route.addr.dev_addr,
                                              timeout_ms, addr_handler, id_priv);
                }
        }
        if (ret)
                goto err;

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

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_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;

        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_port_space ps,
                          struct rdma_id_private *id_priv, unsigned short snum)
{
        struct rdma_bind_list *bind_list;
        int ret;

        bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
        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 = (unsigned short)ret;
        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);

        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(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(cur_daddr) &&
                    cma_addr_cmp(daddr, cur_daddr))
                        continue;

                return -EADDRNOTAVAIL;
        }
        return 0;
}

static int cma_alloc_any_port(enum rdma_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;

        inet_get_local_port_range(net, &low, &high);
        remaining = (high - low) + 1;
        rover = prandom_u32() % remaining + low;
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;

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

                if ((cur_id->state != RDMA_CM_LISTEN) && 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_port_space ps,
                        struct rdma_id_private *id_priv)
{
        struct rdma_bind_list *bind_list;
        unsigned short snum;
        int ret;

        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 int cma_bind_listen(struct rdma_id_private *id_priv)
{
        struct rdma_bind_list *bind_list = id_priv->bind_list;
        int ret = 0;

        mutex_lock(&lock);
        if (bind_list->owners.first->next)
                ret = cma_check_port(bind_list, id_priv, 0);
        mutex_unlock(&lock);
        return ret;
}

static enum rdma_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_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
{
        enum rdma_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_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;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        if (id_priv->state == RDMA_CM_IDLE) {
                id->route.addr.src_addr.ss_family = AF_INET;
                ret = rdma_bind_addr(id, cma_src_addr(id_priv));
                if (ret)
                        return ret;
        }

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

        if (id_priv->reuseaddr) {
                ret = cma_bind_listen(id_priv);
                if (ret)
                        goto err;
        }

        id_priv->backlog = backlog;
        if (id->device) {
                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
                cma_listen_on_all(id_priv);

        return 0;
err:
        id_priv->backlog = 0;
        cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
        return ret;
}
EXPORT_SYMBOL(rdma_listen);

int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
{
        struct rdma_id_private *id_priv;
        int ret;
        struct sockaddr  *daddr;

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

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

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

                ret = cma_acquire_dev(id_priv, NULL);
                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
        }
        ret = cma_get_port(id_priv);
        if (ret)
                goto err2;

        daddr = cma_dst_addr(id_priv);
        daddr->sa_family = addr->sa_family;

        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;
}
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,
                                struct ib_cm_event *ib_event)
{
        struct rdma_id_private *id_priv = cm_id->context;
        struct rdma_cm_event event;
        struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
        int ret = 0;

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

        memset(&event, 0, sizeof event);
        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_from_path(id_priv->id.device, id_priv->id.port_num,
                                     id_priv->id.route.path_rec,
                                     &event.param.ud.ah_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 = id_priv->id.event_handler(&id_priv->id, &event);
        if (ret) {
                /* Destroy the CM ID by returning a non-zero value. */
                id_priv->cm_id.ib = NULL;
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
                rdma_destroy_id(&id_priv->id);
                return ret;
        }
out:
        mutex_unlock(&id_priv->handler_mutex);
        return ret;
}

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;
        int offset, ret;

        memset(&req, 0, sizeof req);
        offset = cma_user_data_offset(id_priv);
        req.private_data_len = offset + conn_param->private_data_len;
        if (req.private_data_len < conn_param->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.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;

        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;
        int offset, ret;

        memset(&req, 0, sizeof req);
        offset = cma_user_data_offset(id_priv);
        req.private_data_len = offset + conn_param->private_data_len;
        if (req.private_data_len < conn_param->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];
        if (route->num_paths == 2)
                req.alternate_path = &route->path_rec[1];

        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;

        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);

        cm_id->tos = id_priv->tos;
        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;
}

int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);
        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;

        return 0;
err:
        cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
        return ret;
}
EXPORT_SYMBOL(rdma_connect);

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;

        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) {
                ret = cma_set_qkey(id_priv, qkey);
                if (ret)
                        return ret;
                rep.qp_num = id_priv->qp_num;
                rep.qkey = id_priv->qkey;
        }
        rep.private_data = private_data;
        rep.private_data_len = private_data_len;

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

int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
        struct rdma_id_private *id_priv;
        int ret;

        id_priv = container_of(id, struct rdma_id_private, id);

        id_priv->owner = task_pid_nr(current);

        if (!cma_comp(id_priv, 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);
        return ret;
}
EXPORT_SYMBOL(rdma_accept);

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)
{
        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
                        ret = ib_send_cm_rej(id_priv->cm_id.ib,
                                             IB_CM_REJ_CONSUMER_DEFINED, 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. */
                if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
                        ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
        } 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 int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
{
        struct rdma_id_private *id_priv;
        struct cma_multicast *mc = multicast->context;
        struct rdma_cm_event event;
        int ret = 0;

        id_priv = mc->id_priv;
        mutex_lock(&id_priv->handler_mutex);
        if (id_priv->state != RDMA_CM_ADDR_BOUND &&
            id_priv->state != RDMA_CM_ADDR_RESOLVED)
                goto out;

        if (!status)
                status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
        else
                pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
                                     status);
        mutex_lock(&id_priv->qp_mutex);
        if (!status && id_priv->id.qp) {
                status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
                                         be16_to_cpu(multicast->rec.mlid));
                if (status)
                        pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
                                             status);
        }
        mutex_unlock(&id_priv->qp_mutex);

        memset(&event, 0, sizeof event);
        event.status = status;
        event.param.ud.private_data = mc->context;
        if (!status) {
                struct rdma_dev_addr *dev_addr =
                        &id_priv->id.route.addr.dev_addr;
                struct net_device *ndev =
                        dev_get_by_index(&init_net, dev_addr->bound_dev_if);
                enum ib_gid_type 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;
                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.param.ud.qp_num = 0xFFFFFF;
                event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
                if (ndev)
                        dev_put(ndev);
        } else
                event.event = RDMA_CM_EVENT_MULTICAST_ERROR;

        ret = id_priv->id.event_handler(&id_priv->id, &event);
        if (ret) {
                cma_exch(id_priv, RDMA_CM_DESTROYING);
                mutex_unlock(&id_priv->handler_mutex);
                rdma_destroy_id(&id_priv->id);
                return 0;
        }

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;

        ret = cma_set_qkey(id_priv, 0);
        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;

        if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
            (!ib_sa_sendonly_fullmem_support(&sa_client,
                                             id_priv->id.device,
                                             id_priv->id.port_num))) {
                pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
                        "RDMA CM: SM doesn't support Send Only Full Member option\n",
                        id_priv->id.device->name, id_priv->id.port_num);
                return -EOPNOTSUPP;
        }

        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->multicast.ib = 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->multicast.ib);
}

static void iboe_mcast_work_handler(struct work_struct *work)
{
        struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
        struct cma_multicast *mc = mw->mc;
        struct ib_sa_multicast *m = mc->multicast.ib;

        mc->multicast.ib->context = mc;
        cma_ib_mc_handler(0, m);
        kref_put(&mc->mcref, release_mc);
        kfree(mw);
}

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_IB) ? 0xff : 0;
                mgid->raw[1] = (gid_type == IB_GID_TYPE_IB) ? 0x0e : 0;
                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 iboe_mcast_work *work;
        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;
        enum ib_gid_type gid_type;
        bool send_only;

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

        if (cma_zero_addr((struct sockaddr *)&mc->addr))
                return -EINVAL;

        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (!work)
                return -ENOMEM;

        mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
        if (!mc->multicast.ib) {
                err = -ENOMEM;
                goto out1;
        }

        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, &mc->multicast.ib->rec.mgid, gid_type);

        mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
        if (id_priv->id.ps == RDMA_PS_UDP)
                mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);

        if (dev_addr->bound_dev_if)
                ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
        if (!ndev) {
                err = -ENODEV;
                goto out2;
        }
        mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
        mc->multicast.ib->rec.hop_limit = 1;
        mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);

        if (addr->sa_family == AF_INET) {
                if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
                        mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
                        if (!send_only) {
                                err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
                                                    true);
                                if (!err)
                                        mc->igmp_joined = true;
                        }
                }
        } else {
                if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
                        err = -ENOTSUPP;
        }
        dev_put(ndev);
        if (err || !mc->multicast.ib->rec.mtu) {
                if (!err)
                        err = -EINVAL;
                goto out2;
        }
        rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                    &mc->multicast.ib->rec.port_gid);
        work->id = id_priv;
        work->mc = mc;
        INIT_WORK(&work->work, iboe_mcast_work_handler);
        kref_get(&mc->mcref);
        queue_work(cma_wq, &work->work);

        return 0;

out2:
        kfree(mc->multicast.ib);
out1:
        kfree(work);
        return err;
}

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

        id_priv = container_of(id, struct rdma_id_private, id);
        if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
            !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
                return -EINVAL;

        mc = kmalloc(sizeof *mc, GFP_KERNEL);
        if (!mc)
                return -ENOMEM;

        memcpy(&mc->addr, addr, rdma_addr_size(addr));
        mc->context = context;
        mc->id_priv = id_priv;
        mc->igmp_joined = false;
        mc->join_state = join_state;
        spin_lock(&id_priv->lock);
        list_add(&mc->list, &id_priv->mc_list);
        spin_unlock(&id_priv->lock);

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

        if (ret) {
                spin_lock_irq(&id_priv->lock);
                list_del(&mc->list);
                spin_unlock_irq(&id_priv->lock);
                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))) {
                        list_del(&mc->list);
                        spin_unlock_irq(&id_priv->lock);

                        if (id->qp)
                                ib_detach_mcast(id->qp,
                                                &mc->multicast.ib->rec.mgid,
                                                be16_to_cpu(mc->multicast.ib->rec.mlid));

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

                        if (rdma_cap_ib_mcast(id->device, id->port_num)) {
                                ib_sa_free_multicast(mc->multicast.ib);
                                kfree(mc);
                        } else if (rdma_protocol_roce(id->device, id->port_num)) {
                                if (mc->igmp_joined) {
                                        struct rdma_dev_addr *dev_addr =
                                                &id->route.addr.dev_addr;
                                        struct net_device *ndev = NULL;

                                        if (dev_addr->bound_dev_if)
                                                ndev = dev_get_by_index(&init_net,
                                                                        dev_addr->bound_dev_if);
                                        if (ndev) {
                                                cma_igmp_send(ndev,
                                                              &mc->multicast.ib->rec.mgid,
                                                              false);
                                                dev_put(ndev);
                                        }
                                        mc->igmp_joined = false;
                                }
                                kref_put(&mc->mcref, release_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_ndev_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(sizeof *work, GFP_KERNEL);
                if (!work)
                        return -ENOMEM;

                INIT_WORK(&work->work, cma_ndev_work_handler);
                work->id = id_priv;
                work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
                atomic_inc(&id_priv->refcount);
                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 (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
                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, list) {
                        ret = cma_netdev_change(ndev, id_priv);
                        if (ret)
                                goto out;
                }

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

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

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

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

        cma_dev->device = device;
        cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
                                            sizeof(*cma_dev->default_gid_type),
                                            GFP_KERNEL);
        if (!cma_dev->default_gid_type)
                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)
                goto free_gid_type;

        for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
                supported_gids = roce_gid_type_mask_support(device, i);
                WARN_ON(!supported_gids);
                if (supported_gids & 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);
        atomic_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, list)
                cma_listen_on_dev(id_priv, cma_dev);
        mutex_unlock(&lock);

        return;

free_gid_type:
        kfree(cma_dev->default_gid_type);

free_cma_dev:
        kfree(cma_dev);

        return;
}

static int cma_remove_id_dev(struct rdma_id_private *id_priv)
{
        struct rdma_cm_event event;
        enum rdma_cm_state state;
        int ret = 0;

        /* Record that we want to remove the device */
        state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
        if (state == RDMA_CM_DESTROYING)
                return 0;

        cma_cancel_operation(id_priv, state);
        mutex_lock(&id_priv->handler_mutex);

        /* Check for destruction from another callback. */
        if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
                goto out;

        memset(&event, 0, sizeof event);
        event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
        ret = id_priv->id.event_handler(&id_priv->id, &event);
out:
        mutex_unlock(&id_priv->handler_mutex);
        return ret;
}

static void cma_process_remove(struct cma_device *cma_dev)
{
        struct rdma_id_private *id_priv;
        int ret;

        mutex_lock(&lock);
        while (!list_empty(&cma_dev->id_list)) {
                id_priv = list_entry(cma_dev->id_list.next,
                                     struct rdma_id_private, list);

                list_del(&id_priv->listen_list);
                list_del_init(&id_priv->list);
                atomic_inc(&id_priv->refcount);
                mutex_unlock(&lock);

                ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
                cma_deref_id(id_priv);
                if (ret)
                        rdma_destroy_id(&id_priv->id);

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

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

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

        if (!cma_dev)
                return;

        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_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
{
        struct nlmsghdr *nlh;
        struct rdma_cm_id_stats *id_stats;
        struct rdma_id_private *id_priv;
        struct rdma_cm_id *id = NULL;
        struct cma_device *cma_dev;
        int i_dev = 0, i_id = 0;

        /*
         * We export all of the IDs as a sequence of messages.  Each
         * ID gets its own netlink message.
         */
        mutex_lock(&lock);

        list_for_each_entry(cma_dev, &dev_list, list) {
                if (i_dev < cb->args[0]) {
                        i_dev++;
                        continue;
                }

                i_id = 0;
                list_for_each_entry(id_priv, &cma_dev->id_list, list) {
                        if (i_id < cb->args[1]) {
                                i_id++;
                                continue;
                        }

                        id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
                                                sizeof *id_stats, RDMA_NL_RDMA_CM,
                                                RDMA_NL_RDMA_CM_ID_STATS,
                                                NLM_F_MULTI);
                        if (!id_stats)
                                goto out;

                        memset(id_stats, 0, sizeof *id_stats);
                        id = &id_priv->id;
                        id_stats->node_type = id->route.addr.dev_addr.dev_type;
                        id_stats->port_num = id->port_num;
                        id_stats->bound_dev_if =
                                id->route.addr.dev_addr.bound_dev_if;

                        if (ibnl_put_attr(skb, nlh,
                                          rdma_addr_size(cma_src_addr(id_priv)),
                                          cma_src_addr(id_priv),
                                          RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
                                goto out;
                        if (ibnl_put_attr(skb, nlh,
                                          rdma_addr_size(cma_src_addr(id_priv)),
                                          cma_dst_addr(id_priv),
                                          RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
                                goto out;

                        id_stats->pid           = id_priv->owner;
                        id_stats->port_space    = id->ps;
                        id_stats->cm_state      = id_priv->state;
                        id_stats->qp_num        = id_priv->qp_num;
                        id_stats->qp_type       = id->qp_type;

                        i_id++;
                }

                cb->args[1] = 0;
                i_dev++;
        }

out:
        mutex_unlock(&lock);
        cb->args[0] = i_dev;
        cb->args[1] = i_id;

        return skb->len;
}

static const struct ibnl_client_cbs cma_cb_table[] = {
        [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
                                       .module = THIS_MODULE },
};

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

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

        return 0;
}

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

        idr_destroy(&pernet->tcp_ps);
        idr_destroy(&pernet->udp_ps);
        idr_destroy(&pernet->ipoib_ps);
        idr_destroy(&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;

        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);
        rdma_addr_register_client(&addr_client);
        register_netdevice_notifier(&cma_nb);

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

        if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
                            cma_cb_table))
                pr_warn("RDMA CMA: failed to add netlink callback\n");
        cma_configfs_init();

        return 0;

err:
        unregister_netdevice_notifier(&cma_nb);
        rdma_addr_unregister_client(&addr_client);
        ib_sa_unregister_client(&sa_client);
err_wq:
        destroy_workqueue(cma_wq);
        return ret;
}

static void __exit cma_cleanup(void)
{
        cma_configfs_exit();
        ibnl_remove_client(RDMA_NL_RDMA_CM);
        ib_unregister_client(&cma_client);
        unregister_netdevice_notifier(&cma_nb);
        rdma_addr_unregister_client(&addr_client);
        ib_sa_unregister_client(&sa_client);
        unregister_pernet_subsys(&cma_pernet_operations);
        destroy_workqueue(cma_wq);
}

module_init(cma_init);
module_exit(cma_cleanup);