OSCL-LXR linux-6.0.1/​drivers/​infiniband/​core/​cma.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 /*
  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
  * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
  */
 
 #include <linux/completion.h>
 #include <linux/in.h>
 #include <linux/in6.h>
 #include <linux/mutex.h>
 #include <linux/random.h>
 #include <linux/rbtree.h>
 #include <linux/igmp.h>
 #include <linux/xarray.h>
 #include <linux/inetdevice.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <net/route.h>
 
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
 #include <net/netevent.h>
 #include <net/tcp.h>
 #include <net/ipv6.h>
 #include <net/ip_fib.h>
 #include <net/ip6_route.h>
 
 #include <rdma/rdma_cm.h>
 #include <rdma/rdma_cm_ib.h>
 #include <rdma/rdma_netlink.h>
 #include <rdma/ib.h>
 #include <rdma/ib_cache.h>
 #include <rdma/ib_cm.h>
 #include <rdma/ib_sa.h>
 #include <rdma/iw_cm.h>
 
 #include "core_priv.h"
 #include "cma_priv.h"
 #include "cma_trace.h"
 
 MODULE_AUTHOR("Sean Hefty");
 MODULE_DESCRIPTION("Generic RDMA CM Agent");
 MODULE_LICENSE("Dual BSD/GPL");
 
 #define CMA_CM_RESPONSE_TIMEOUT 20
 #define CMA_MAX_CM_RETRIES 15
 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
 #define CMA_IBOE_PACKET_LIFETIME 18
 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
 
 static const char * const cma_events[] = {
     [RDMA_CM_EVENT_ADDR_RESOLVED]    = "address resolved",
     [RDMA_CM_EVENT_ADDR_ERROR]   = "address error",
     [RDMA_CM_EVENT_ROUTE_RESOLVED]   = "route resolved ",
     [RDMA_CM_EVENT_ROUTE_ERROR]  = "route error",
     [RDMA_CM_EVENT_CONNECT_REQUEST]  = "connect request",
     [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
     [RDMA_CM_EVENT_CONNECT_ERROR]    = "connect error",
     [RDMA_CM_EVENT_UNREACHABLE]  = "unreachable",
     [RDMA_CM_EVENT_REJECTED]     = "rejected",
     [RDMA_CM_EVENT_ESTABLISHED]  = "established",
     [RDMA_CM_EVENT_DISCONNECTED]     = "disconnected",
     [RDMA_CM_EVENT_DEVICE_REMOVAL]   = "device removal",
     [RDMA_CM_EVENT_MULTICAST_JOIN]   = "multicast join",
     [RDMA_CM_EVENT_MULTICAST_ERROR]  = "multicast error",
     [RDMA_CM_EVENT_ADDR_CHANGE]  = "address change",
     [RDMA_CM_EVENT_TIMEWAIT_EXIT]    = "timewait exit",
 };
 
 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
                   enum ib_gid_type gid_type);
 
 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
 {
     size_t index = event;
 
     return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
             cma_events[index] : "unrecognized event";
 }
 EXPORT_SYMBOL(rdma_event_msg);
 
 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
                         int reason)
 {
     if (rdma_ib_or_roce(id->device, id->port_num))
         return ibcm_reject_msg(reason);
 
     if (rdma_protocol_iwarp(id->device, id->port_num))
         return iwcm_reject_msg(reason);
 
     WARN_ON_ONCE(1);
     return "unrecognized transport";
 }
 EXPORT_SYMBOL(rdma_reject_msg);
 
 /**
  * rdma_is_consumer_reject - return true if the consumer rejected the connect
  *                           request.
  * @id: Communication identifier that received the REJECT event.
  * @reason: Value returned in the REJECT event status field.
  */
 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
 {
     if (rdma_ib_or_roce(id->device, id->port_num))
         return reason == IB_CM_REJ_CONSUMER_DEFINED;
 
     if (rdma_protocol_iwarp(id->device, id->port_num))
         return reason == -ECONNREFUSED;
 
     WARN_ON_ONCE(1);
     return false;
 }
 
 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
                       struct rdma_cm_event *ev, u8 *data_len)
 {
     const void *p;
 
     if (rdma_is_consumer_reject(id, ev->status)) {
         *data_len = ev->param.conn.private_data_len;
         p = ev->param.conn.private_data;
     } else {
         *data_len = 0;
         p = NULL;
     }
     return p;
 }
 EXPORT_SYMBOL(rdma_consumer_reject_data);
 
 /**
  * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
  * @id: Communication Identifier
  */
 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (id->device->node_type == RDMA_NODE_RNIC)
         return id_priv->cm_id.iw;
     return NULL;
 }
 EXPORT_SYMBOL(rdma_iw_cm_id);
 
 /**
  * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
  * @res: rdma resource tracking entry pointer
  */
 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
 {
     struct rdma_id_private *id_priv =
         container_of(res, struct rdma_id_private, res);
 
     return &id_priv->id;
 }
 EXPORT_SYMBOL(rdma_res_to_id);
 
 static int cma_add_one(struct ib_device *device);
 static void cma_remove_one(struct ib_device *device, void *client_data);
 
 static struct ib_client cma_client = {
     .name   = "cma",
     .add    = cma_add_one,
     .remove = cma_remove_one
 };
 
 static struct ib_sa_client sa_client;
 static LIST_HEAD(dev_list);
 static LIST_HEAD(listen_any_list);
 static DEFINE_MUTEX(lock);
 static struct rb_root id_table = RB_ROOT;
 /* Serialize operations of id_table tree */
 static DEFINE_SPINLOCK(id_table_lock);
 static struct workqueue_struct *cma_wq;
 static unsigned int cma_pernet_id;
 
 struct cma_pernet {
     struct xarray tcp_ps;
     struct xarray udp_ps;
     struct xarray ipoib_ps;
     struct xarray ib_ps;
 };
 
 static struct cma_pernet *cma_pernet(struct net *net)
 {
     return net_generic(net, cma_pernet_id);
 }
 
 static
 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
 {
     struct cma_pernet *pernet = cma_pernet(net);
 
     switch (ps) {
     case RDMA_PS_TCP:
         return &pernet->tcp_ps;
     case RDMA_PS_UDP:
         return &pernet->udp_ps;
     case RDMA_PS_IPOIB:
         return &pernet->ipoib_ps;
     case RDMA_PS_IB:
         return &pernet->ib_ps;
     default:
         return NULL;
     }
 }
 
 struct id_table_entry {
     struct list_head id_list;
     struct rb_node rb_node;
 };
 
 struct cma_device {
     struct list_head    list;
     struct ib_device    *device;
     struct completion   comp;
     refcount_t refcount;
     struct list_head    id_list;
     enum ib_gid_type    *default_gid_type;
     u8          *default_roce_tos;
 };
 
 struct rdma_bind_list {
     enum rdma_ucm_port_space ps;
     struct hlist_head   owners;
     unsigned short      port;
 };
 
 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
             struct rdma_bind_list *bind_list, int snum)
 {
     struct xarray *xa = cma_pernet_xa(net, ps);
 
     return xa_insert(xa, snum, bind_list, GFP_KERNEL);
 }
 
 static struct rdma_bind_list *cma_ps_find(struct net *net,
                       enum rdma_ucm_port_space ps, int snum)
 {
     struct xarray *xa = cma_pernet_xa(net, ps);
 
     return xa_load(xa, snum);
 }
 
 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
               int snum)
 {
     struct xarray *xa = cma_pernet_xa(net, ps);
 
     xa_erase(xa, snum);
 }
 
 enum {
     CMA_OPTION_AFONLY,
 };
 
 void cma_dev_get(struct cma_device *cma_dev)
 {
     refcount_inc(&cma_dev->refcount);
 }
 
 void cma_dev_put(struct cma_device *cma_dev)
 {
     if (refcount_dec_and_test(&cma_dev->refcount))
         complete(&cma_dev->comp);
 }
 
 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter  filter,
                          void       *cookie)
 {
     struct cma_device *cma_dev;
     struct cma_device *found_cma_dev = NULL;
 
     mutex_lock(&lock);
 
     list_for_each_entry(cma_dev, &dev_list, list)
         if (filter(cma_dev->device, cookie)) {
             found_cma_dev = cma_dev;
             break;
         }
 
     if (found_cma_dev)
         cma_dev_get(found_cma_dev);
     mutex_unlock(&lock);
     return found_cma_dev;
 }
 
 int cma_get_default_gid_type(struct cma_device *cma_dev,
                  u32 port)
 {
     if (!rdma_is_port_valid(cma_dev->device, port))
         return -EINVAL;
 
     return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
 }
 
 int cma_set_default_gid_type(struct cma_device *cma_dev,
                  u32 port,
                  enum ib_gid_type default_gid_type)
 {
     unsigned long supported_gids;
 
     if (!rdma_is_port_valid(cma_dev->device, port))
         return -EINVAL;
 
     if (default_gid_type == IB_GID_TYPE_IB &&
         rdma_protocol_roce_eth_encap(cma_dev->device, port))
         default_gid_type = IB_GID_TYPE_ROCE;
 
     supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
 
     if (!(supported_gids & 1 << default_gid_type))
         return -EINVAL;
 
     cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
         default_gid_type;
 
     return 0;
 }
 
 int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
 {
     if (!rdma_is_port_valid(cma_dev->device, port))
         return -EINVAL;
 
     return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
 }
 
 int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
                  u8 default_roce_tos)
 {
     if (!rdma_is_port_valid(cma_dev->device, port))
         return -EINVAL;
 
     cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
          default_roce_tos;
 
     return 0;
 }
 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
 {
     return cma_dev->device;
 }
 
 /*
  * Device removal can occur at anytime, so we need extra handling to
  * serialize notifying the user of device removal with other callbacks.
  * We do this by disabling removal notification while a callback is in process,
  * and reporting it after the callback completes.
  */
 
 struct cma_multicast {
     struct rdma_id_private *id_priv;
     union {
         struct ib_sa_multicast *sa_mc;
         struct {
             struct work_struct work;
             struct rdma_cm_event event;
         } iboe_join;
     };
     struct list_head    list;
     void            *context;
     struct sockaddr_storage addr;
     u8          join_state;
 };
 
 struct cma_work {
     struct work_struct  work;
     struct rdma_id_private  *id;
     enum rdma_cm_state  old_state;
     enum rdma_cm_state  new_state;
     struct rdma_cm_event    event;
 };
 
 union cma_ip_addr {
     struct in6_addr ip6;
     struct {
         __be32 pad[3];
         __be32 addr;
     } ip4;
 };
 
 struct cma_hdr {
     u8 cma_version;
     u8 ip_version;  /* IP version: 7:4 */
     __be16 port;
     union cma_ip_addr src_addr;
     union cma_ip_addr dst_addr;
 };
 
 #define CMA_VERSION 0x00
 
 struct cma_req_info {
     struct sockaddr_storage listen_addr_storage;
     struct sockaddr_storage src_addr_storage;
     struct ib_device *device;
     union ib_gid local_gid;
     __be64 service_id;
     int port;
     bool has_gid;
     u16 pkey;
 };
 
 static int cma_comp_exch(struct rdma_id_private *id_priv,
              enum rdma_cm_state comp, enum rdma_cm_state exch)
 {
     unsigned long flags;
     int ret;
 
     /*
      * The FSM uses a funny double locking where state is protected by both
      * the handler_mutex and the spinlock. State is not allowed to change
      * to/from a handler_mutex protected value without also holding
      * handler_mutex.
      */
     if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
         lockdep_assert_held(&id_priv->handler_mutex);
 
     spin_lock_irqsave(&id_priv->lock, flags);
     if ((ret = (id_priv->state == comp)))
         id_priv->state = exch;
     spin_unlock_irqrestore(&id_priv->lock, flags);
     return ret;
 }
 
 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
 {
     return hdr->ip_version >> 4;
 }
 
 static void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 {
     hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 }
 
 static struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
 {
     return (struct sockaddr *)&id_priv->id.route.addr.src_addr;
 }
 
 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
 {
     return (struct sockaddr *)&id_priv->id.route.addr.dst_addr;
 }
 
 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
 {
     struct in_device *in_dev = NULL;
 
     if (ndev) {
         rtnl_lock();
         in_dev = __in_dev_get_rtnl(ndev);
         if (in_dev) {
             if (join)
                 ip_mc_inc_group(in_dev,
                         *(__be32 *)(mgid->raw + 12));
             else
                 ip_mc_dec_group(in_dev,
                         *(__be32 *)(mgid->raw + 12));
         }
         rtnl_unlock();
     }
     return (in_dev) ? 0 : -ENODEV;
 }
 
 static int compare_netdev_and_ip(int ifindex_a, struct sockaddr *sa,
                  struct id_table_entry *entry_b)
 {
     struct rdma_id_private *id_priv = list_first_entry(
         &entry_b->id_list, struct rdma_id_private, id_list_entry);
     int ifindex_b = id_priv->id.route.addr.dev_addr.bound_dev_if;
     struct sockaddr *sb = cma_dst_addr(id_priv);
 
     if (ifindex_a != ifindex_b)
         return (ifindex_a > ifindex_b) ? 1 : -1;
 
     if (sa->sa_family != sb->sa_family)
         return sa->sa_family - sb->sa_family;
 
     if (sa->sa_family == AF_INET)
         return memcmp((char *)&((struct sockaddr_in *)sa)->sin_addr,
                   (char *)&((struct sockaddr_in *)sb)->sin_addr,
                   sizeof(((struct sockaddr_in *)sa)->sin_addr));
 
     return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
                  &((struct sockaddr_in6 *)sb)->sin6_addr);
 }
 
 static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv)
 {
     struct rb_node **new, *parent = NULL;
     struct id_table_entry *this, *node;
     unsigned long flags;
     int result;
 
     node = kzalloc(sizeof(*node), GFP_KERNEL);
     if (!node)
         return -ENOMEM;
 
     spin_lock_irqsave(&id_table_lock, flags);
     new = &id_table.rb_node;
     while (*new) {
         this = container_of(*new, struct id_table_entry, rb_node);
         result = compare_netdev_and_ip(
             node_id_priv->id.route.addr.dev_addr.bound_dev_if,
             cma_dst_addr(node_id_priv), this);
 
         parent = *new;
         if (result < 0)
             new = &((*new)->rb_left);
         else if (result > 0)
             new = &((*new)->rb_right);
         else {
             list_add_tail(&node_id_priv->id_list_entry,
                       &this->id_list);
             kfree(node);
             goto unlock;
         }
     }
 
     INIT_LIST_HEAD(&node->id_list);
     list_add_tail(&node_id_priv->id_list_entry, &node->id_list);
 
     rb_link_node(&node->rb_node, parent, new);
     rb_insert_color(&node->rb_node, &id_table);
 
 unlock:
     spin_unlock_irqrestore(&id_table_lock, flags);
     return 0;
 }
 
 static struct id_table_entry *
 node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa)
 {
     struct rb_node *node = root->rb_node;
     struct id_table_entry *data;
     int result;
 
     while (node) {
         data = container_of(node, struct id_table_entry, rb_node);
         result = compare_netdev_and_ip(ifindex, sa, data);
         if (result < 0)
             node = node->rb_left;
         else if (result > 0)
             node = node->rb_right;
         else
             return data;
     }
 
     return NULL;
 }
 
 static void cma_remove_id_from_tree(struct rdma_id_private *id_priv)
 {
     struct id_table_entry *data;
     unsigned long flags;
 
     spin_lock_irqsave(&id_table_lock, flags);
     if (list_empty(&id_priv->id_list_entry))
         goto out;
 
     data = node_from_ndev_ip(&id_table,
                  id_priv->id.route.addr.dev_addr.bound_dev_if,
                  cma_dst_addr(id_priv));
     if (!data)
         goto out;
 
     list_del_init(&id_priv->id_list_entry);
     if (list_empty(&data->id_list)) {
         rb_erase(&data->rb_node, &id_table);
         kfree(data);
     }
 out:
     spin_unlock_irqrestore(&id_table_lock, flags);
 }
 
 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
                    struct cma_device *cma_dev)
 {
     cma_dev_get(cma_dev);
     id_priv->cma_dev = cma_dev;
     id_priv->id.device = cma_dev->device;
     id_priv->id.route.addr.dev_addr.transport =
         rdma_node_get_transport(cma_dev->device->node_type);
     list_add_tail(&id_priv->device_item, &cma_dev->id_list);
 
     trace_cm_id_attach(id_priv, cma_dev->device);
 }
 
 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
                   struct cma_device *cma_dev)
 {
     _cma_attach_to_dev(id_priv, cma_dev);
     id_priv->gid_type =
         cma_dev->default_gid_type[id_priv->id.port_num -
                       rdma_start_port(cma_dev->device)];
 }
 
 static void cma_release_dev(struct rdma_id_private *id_priv)
 {
     mutex_lock(&lock);
     list_del_init(&id_priv->device_item);
     cma_dev_put(id_priv->cma_dev);
     id_priv->cma_dev = NULL;
     id_priv->id.device = NULL;
     if (id_priv->id.route.addr.dev_addr.sgid_attr) {
         rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
         id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
     }
     mutex_unlock(&lock);
 }
 
 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
 {
     return id_priv->id.route.addr.src_addr.ss_family;
 }
 
 static int cma_set_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);
     } else {
         cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
         ret = 0;
     }
 
     return ret;
 }
 
 static const struct ib_gid_attr *
 cma_validate_port(struct ib_device *device, u32 port,
           enum ib_gid_type gid_type,
           union ib_gid *gid,
           struct rdma_id_private *id_priv)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     int bound_if_index = dev_addr->bound_dev_if;
     const struct ib_gid_attr *sgid_attr;
     int dev_type = dev_addr->dev_type;
     struct net_device *ndev = NULL;
 
     if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
         return ERR_PTR(-ENODEV);
 
     if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
         return ERR_PTR(-ENODEV);
 
     if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
         return ERR_PTR(-ENODEV);
 
     if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
         ndev = dev_get_by_index(dev_addr->net, bound_if_index);
         if (!ndev)
             return ERR_PTR(-ENODEV);
     } else {
         gid_type = IB_GID_TYPE_IB;
     }
 
     sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
     if (ndev)
         dev_put(ndev);
     return sgid_attr;
 }
 
 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
                    const struct ib_gid_attr *sgid_attr)
 {
     WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
     id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
 }
 
 /**
  * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
  * based on source ip address.
  * @id_priv:    cm_id which should be bound to cma device
  *
  * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
  * based on source IP address. It returns 0 on success or error code otherwise.
  * It is applicable to active and passive side cm_id.
  */
 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     const struct ib_gid_attr *sgid_attr;
     union ib_gid gid, iboe_gid, *gidp;
     struct cma_device *cma_dev;
     enum ib_gid_type gid_type;
     int ret = -ENODEV;
     u32 port;
 
     if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
         id_priv->id.ps == RDMA_PS_IPOIB)
         return -EINVAL;
 
     rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
             &iboe_gid);
 
     memcpy(&gid, dev_addr->src_dev_addr +
            rdma_addr_gid_offset(dev_addr), sizeof(gid));
 
     mutex_lock(&lock);
     list_for_each_entry(cma_dev, &dev_list, list) {
         rdma_for_each_port (cma_dev->device, port) {
             gidp = rdma_protocol_roce(cma_dev->device, port) ?
                    &iboe_gid : &gid;
             gid_type = cma_dev->default_gid_type[port - 1];
             sgid_attr = cma_validate_port(cma_dev->device, port,
                               gid_type, gidp, id_priv);
             if (!IS_ERR(sgid_attr)) {
                 id_priv->id.port_num = port;
                 cma_bind_sgid_attr(id_priv, sgid_attr);
                 cma_attach_to_dev(id_priv, cma_dev);
                 ret = 0;
                 goto out;
             }
         }
     }
 out:
     mutex_unlock(&lock);
     return ret;
 }
 
 /**
  * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
  * @id_priv:        cm id to bind to cma device
  * @listen_id_priv: listener cm id to match against
  * @req:        Pointer to req structure containaining incoming
  *          request information
  * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
  * rdma device matches for listen_id and incoming request. It also verifies
  * that a GID table entry is present for the source address.
  * Returns 0 on success, or returns error code otherwise.
  */
 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
                   const struct rdma_id_private *listen_id_priv,
                   struct cma_req_info *req)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     const struct ib_gid_attr *sgid_attr;
     enum ib_gid_type gid_type;
     union ib_gid gid;
 
     if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
         id_priv->id.ps == RDMA_PS_IPOIB)
         return -EINVAL;
 
     if (rdma_protocol_roce(req->device, req->port))
         rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
                 &gid);
     else
         memcpy(&gid, dev_addr->src_dev_addr +
                rdma_addr_gid_offset(dev_addr), sizeof(gid));
 
     gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
     sgid_attr = cma_validate_port(req->device, req->port,
                       gid_type, &gid, id_priv);
     if (IS_ERR(sgid_attr))
         return PTR_ERR(sgid_attr);
 
     id_priv->id.port_num = req->port;
     cma_bind_sgid_attr(id_priv, sgid_attr);
     /* Need to acquire lock to protect against reader
      * of cma_dev->id_list such as cma_netdev_callback() and
      * cma_process_remove().
      */
     mutex_lock(&lock);
     cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
     mutex_unlock(&lock);
     rdma_restrack_add(&id_priv->res);
     return 0;
 }
 
 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
                   const struct rdma_id_private *listen_id_priv)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     const struct ib_gid_attr *sgid_attr;
     struct cma_device *cma_dev;
     enum ib_gid_type gid_type;
     int ret = -ENODEV;
     union ib_gid gid;
     u32 port;
 
     if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
         id_priv->id.ps == RDMA_PS_IPOIB)
         return -EINVAL;
 
     memcpy(&gid, dev_addr->src_dev_addr +
            rdma_addr_gid_offset(dev_addr), sizeof(gid));
 
     mutex_lock(&lock);
 
     cma_dev = listen_id_priv->cma_dev;
     port = listen_id_priv->id.port_num;
     gid_type = listen_id_priv->gid_type;
     sgid_attr = cma_validate_port(cma_dev->device, port,
                       gid_type, &gid, id_priv);
     if (!IS_ERR(sgid_attr)) {
         id_priv->id.port_num = port;
         cma_bind_sgid_attr(id_priv, sgid_attr);
         ret = 0;
         goto out;
     }
 
     list_for_each_entry(cma_dev, &dev_list, list) {
         rdma_for_each_port (cma_dev->device, port) {
             if (listen_id_priv->cma_dev == cma_dev &&
                 listen_id_priv->id.port_num == port)
                 continue;
 
             gid_type = cma_dev->default_gid_type[port - 1];
             sgid_attr = cma_validate_port(cma_dev->device, port,
                               gid_type, &gid, id_priv);
             if (!IS_ERR(sgid_attr)) {
                 id_priv->id.port_num = port;
                 cma_bind_sgid_attr(id_priv, sgid_attr);
                 ret = 0;
                 goto out;
             }
         }
     }
 
 out:
     if (!ret) {
         cma_attach_to_dev(id_priv, cma_dev);
         rdma_restrack_add(&id_priv->res);
     }
 
     mutex_unlock(&lock);
     return ret;
 }
 
 /*
  * Select the source IB device and address to reach the destination IB address.
  */
 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
 {
     struct cma_device *cma_dev, *cur_dev;
     struct sockaddr_ib *addr;
     union ib_gid gid, sgid, *dgid;
     unsigned int p;
     u16 pkey, index;
     enum ib_port_state port_state;
     int ret;
     int i;
 
     cma_dev = NULL;
     addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
     dgid = (union ib_gid *) &addr->sib_addr;
     pkey = ntohs(addr->sib_pkey);
 
     mutex_lock(&lock);
     list_for_each_entry(cur_dev, &dev_list, list) {
         rdma_for_each_port (cur_dev->device, p) {
             if (!rdma_cap_af_ib(cur_dev->device, p))
                 continue;
 
             if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
                 continue;
 
             if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
                 continue;
 
             for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
                  ++i) {
                 ret = rdma_query_gid(cur_dev->device, p, i,
                              &gid);
                 if (ret)
                     continue;
 
                 if (!memcmp(&gid, dgid, sizeof(gid))) {
                     cma_dev = cur_dev;
                     sgid = gid;
                     id_priv->id.port_num = p;
                     goto found;
                 }
 
                 if (!cma_dev && (gid.global.subnet_prefix ==
                     dgid->global.subnet_prefix) &&
                     port_state == IB_PORT_ACTIVE) {
                     cma_dev = cur_dev;
                     sgid = gid;
                     id_priv->id.port_num = p;
                     goto found;
                 }
             }
         }
     }
     mutex_unlock(&lock);
     return -ENODEV;
 
 found:
     cma_attach_to_dev(id_priv, cma_dev);
     rdma_restrack_add(&id_priv->res);
     mutex_unlock(&lock);
     addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
     memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
     cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
     return 0;
 }
 
 static void cma_id_get(struct rdma_id_private *id_priv)
 {
     refcount_inc(&id_priv->refcount);
 }
 
 static void cma_id_put(struct rdma_id_private *id_priv)
 {
     if (refcount_dec_and_test(&id_priv->refcount))
         complete(&id_priv->comp);
 }
 
 static struct rdma_id_private *
 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
          void *context, enum rdma_ucm_port_space ps,
          enum ib_qp_type qp_type, const struct rdma_id_private *parent)
 {
     struct rdma_id_private *id_priv;
 
     id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
     if (!id_priv)
         return ERR_PTR(-ENOMEM);
 
     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;
     id_priv->timeout_set = false;
     id_priv->min_rnr_timer_set = false;
     id_priv->gid_type = IB_GID_TYPE_IB;
     spin_lock_init(&id_priv->lock);
     mutex_init(&id_priv->qp_mutex);
     init_completion(&id_priv->comp);
     refcount_set(&id_priv->refcount, 1);
     mutex_init(&id_priv->handler_mutex);
     INIT_LIST_HEAD(&id_priv->device_item);
     INIT_LIST_HEAD(&id_priv->id_list_entry);
     INIT_LIST_HEAD(&id_priv->listen_list);
     INIT_LIST_HEAD(&id_priv->mc_list);
     get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
     id_priv->id.route.addr.dev_addr.net = get_net(net);
     id_priv->seq_num &= 0x00ffffff;
 
     rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
     if (parent)
         rdma_restrack_parent_name(&id_priv->res, &parent->res);
 
     return id_priv;
 }
 
 struct rdma_cm_id *
 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
             void *context, enum rdma_ucm_port_space ps,
             enum ib_qp_type qp_type, const char *caller)
 {
     struct rdma_id_private *ret;
 
     ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
     if (IS_ERR(ret))
         return ERR_CAST(ret);
 
     rdma_restrack_set_name(&ret->res, caller);
     return &ret->id;
 }
 EXPORT_SYMBOL(__rdma_create_kernel_id);
 
 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
                        void *context,
                        enum rdma_ucm_port_space ps,
                        enum ib_qp_type qp_type)
 {
     struct rdma_id_private *ret;
 
     ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
                    ps, qp_type, NULL);
     if (IS_ERR(ret))
         return ERR_CAST(ret);
 
     rdma_restrack_set_name(&ret->res, NULL);
     return &ret->id;
 }
 EXPORT_SYMBOL(rdma_create_user_id);
 
 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 {
     struct ib_qp_attr qp_attr;
     int qp_attr_mask, ret;
 
     qp_attr.qp_state = IB_QPS_INIT;
     ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
     if (ret)
         return ret;
 
     ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
     if (ret)
         return ret;
 
     qp_attr.qp_state = IB_QPS_RTR;
     ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
     if (ret)
         return ret;
 
     qp_attr.qp_state = IB_QPS_RTS;
     qp_attr.sq_psn = 0;
     ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 
     return ret;
 }
 
 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 {
     struct ib_qp_attr qp_attr;
     int qp_attr_mask, ret;
 
     qp_attr.qp_state = IB_QPS_INIT;
     ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
     if (ret)
         return ret;
 
     return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 }
 
 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
            struct ib_qp_init_attr *qp_init_attr)
 {
     struct rdma_id_private *id_priv;
     struct ib_qp *qp;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (id->device != pd->device) {
         ret = -EINVAL;
         goto out_err;
     }
 
     qp_init_attr->port_num = id->port_num;
     qp = ib_create_qp(pd, qp_init_attr);
     if (IS_ERR(qp)) {
         ret = PTR_ERR(qp);
         goto out_err;
     }
 
     if (id->qp_type == IB_QPT_UD)
         ret = cma_init_ud_qp(id_priv, qp);
     else
         ret = cma_init_conn_qp(id_priv, qp);
     if (ret)
         goto out_destroy;
 
     id->qp = qp;
     id_priv->qp_num = qp->qp_num;
     id_priv->srq = (qp->srq != NULL);
     trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
     return 0;
 out_destroy:
     ib_destroy_qp(qp);
 out_err:
     trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
     return ret;
 }
 EXPORT_SYMBOL(rdma_create_qp);
 
 void rdma_destroy_qp(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     trace_cm_qp_destroy(id_priv);
     mutex_lock(&id_priv->qp_mutex);
     ib_destroy_qp(id_priv->id.qp);
     id_priv->id.qp = NULL;
     mutex_unlock(&id_priv->qp_mutex);
 }
 EXPORT_SYMBOL(rdma_destroy_qp);
 
 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
                  struct rdma_conn_param *conn_param)
 {
     struct ib_qp_attr qp_attr;
     int qp_attr_mask, ret;
 
     mutex_lock(&id_priv->qp_mutex);
     if (!id_priv->id.qp) {
         ret = 0;
         goto out;
     }
 
     /* Need to update QP attributes from default values. */
     qp_attr.qp_state = IB_QPS_INIT;
     ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
     if (ret)
         goto out;
 
     ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
     if (ret)
         goto out;
 
     qp_attr.qp_state = IB_QPS_RTR;
     ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
     if (ret)
         goto out;
 
     BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
 
     if (conn_param)
         qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
     ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 out:
     mutex_unlock(&id_priv->qp_mutex);
     return ret;
 }
 
 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
                  struct rdma_conn_param *conn_param)
 {
     struct ib_qp_attr qp_attr;
     int qp_attr_mask, ret;
 
     mutex_lock(&id_priv->qp_mutex);
     if (!id_priv->id.qp) {
         ret = 0;
         goto out;
     }
 
     qp_attr.qp_state = IB_QPS_RTS;
     ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
     if (ret)
         goto out;
 
     if (conn_param)
         qp_attr.max_rd_atomic = conn_param->initiator_depth;
     ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 out:
     mutex_unlock(&id_priv->qp_mutex);
     return ret;
 }
 
 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 {
     struct ib_qp_attr qp_attr;
     int ret;
 
     mutex_lock(&id_priv->qp_mutex);
     if (!id_priv->id.qp) {
         ret = 0;
         goto out;
     }
 
     qp_attr.qp_state = IB_QPS_ERR;
     ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 out:
     mutex_unlock(&id_priv->qp_mutex);
     return ret;
 }
 
 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
                    struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     int ret;
     u16 pkey;
 
     if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
         pkey = 0xffff;
     else
         pkey = ib_addr_get_pkey(dev_addr);
 
     ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
                   pkey, &qp_attr->pkey_index);
     if (ret)
         return ret;
 
     qp_attr->port_num = id_priv->id.port_num;
     *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 
     if (id_priv->id.qp_type == IB_QPT_UD) {
         ret = cma_set_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;
     }
 
     if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
         qp_attr->timeout = id_priv->timeout;
 
     if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
         qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
 
     return ret;
 }
 EXPORT_SYMBOL(rdma_init_qp_attr);
 
 static inline bool cma_zero_addr(const struct sockaddr *addr)
 {
     switch (addr->sa_family) {
     case AF_INET:
         return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
     case AF_INET6:
         return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
     case AF_IB:
         return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
     default:
         return false;
     }
 }
 
 static inline bool cma_loopback_addr(const struct sockaddr *addr)
 {
     switch (addr->sa_family) {
     case AF_INET:
         return ipv4_is_loopback(
             ((struct sockaddr_in *)addr)->sin_addr.s_addr);
     case AF_INET6:
         return ipv6_addr_loopback(
             &((struct sockaddr_in6 *)addr)->sin6_addr);
     case AF_IB:
         return ib_addr_loopback(
             &((struct sockaddr_ib *)addr)->sib_addr);
     default:
         return false;
     }
 }
 
 static inline bool cma_any_addr(const struct sockaddr *addr)
 {
     return cma_zero_addr(addr) || cma_loopback_addr(addr);
 }
 
 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
 {
     if (src->sa_family != dst->sa_family)
         return -1;
 
     switch (src->sa_family) {
     case AF_INET:
         return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
                ((struct sockaddr_in *)dst)->sin_addr.s_addr;
     case AF_INET6: {
         struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
         struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
         bool link_local;
 
         if (ipv6_addr_cmp(&src_addr6->sin6_addr,
                       &dst_addr6->sin6_addr))
             return 1;
         link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
                  IPV6_ADDR_LINKLOCAL;
         /* Link local must match their scope_ids */
         return link_local ? (src_addr6->sin6_scope_id !=
                      dst_addr6->sin6_scope_id) :
                     0;
     }
 
     default:
         return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
                    &((struct sockaddr_ib *) dst)->sib_addr);
     }
 }
 
 static __be16 cma_port(const struct sockaddr *addr)
 {
     struct sockaddr_ib *sib;
 
     switch (addr->sa_family) {
     case AF_INET:
         return ((struct sockaddr_in *) addr)->sin_port;
     case AF_INET6:
         return ((struct sockaddr_in6 *) addr)->sin6_port;
     case AF_IB:
         sib = (struct sockaddr_ib *) addr;
         return htons((u16) (be64_to_cpu(sib->sib_sid) &
                     be64_to_cpu(sib->sib_sid_mask)));
     default:
         return 0;
     }
 }
 
 static inline int cma_any_port(const struct sockaddr *addr)
 {
     return !cma_port(addr);
 }
 
 static void cma_save_ib_info(struct sockaddr *src_addr,
                  struct sockaddr *dst_addr,
                  const struct rdma_cm_id *listen_id,
                  const struct sa_path_rec *path)
 {
     struct sockaddr_ib *listen_ib, *ib;
 
     listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
     if (src_addr) {
         ib = (struct sockaddr_ib *)src_addr;
         ib->sib_family = AF_IB;
         if (path) {
             ib->sib_pkey = path->pkey;
             ib->sib_flowinfo = path->flow_label;
             memcpy(&ib->sib_addr, &path->sgid, 16);
             ib->sib_sid = path->service_id;
             ib->sib_scope_id = 0;
         } else {
             ib->sib_pkey = listen_ib->sib_pkey;
             ib->sib_flowinfo = listen_ib->sib_flowinfo;
             ib->sib_addr = listen_ib->sib_addr;
             ib->sib_sid = listen_ib->sib_sid;
             ib->sib_scope_id = listen_ib->sib_scope_id;
         }
         ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
     }
     if (dst_addr) {
         ib = (struct sockaddr_ib *)dst_addr;
         ib->sib_family = AF_IB;
         if (path) {
             ib->sib_pkey = path->pkey;
             ib->sib_flowinfo = path->flow_label;
             memcpy(&ib->sib_addr, &path->dgid, 16);
         }
     }
 }
 
 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
                   struct sockaddr_in *dst_addr,
                   struct cma_hdr *hdr,
                   __be16 local_port)
 {
     if (src_addr) {
         *src_addr = (struct sockaddr_in) {
             .sin_family = AF_INET,
             .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
             .sin_port = local_port,
         };
     }
 
     if (dst_addr) {
         *dst_addr = (struct sockaddr_in) {
             .sin_family = AF_INET,
             .sin_addr.s_addr = hdr->src_addr.ip4.addr,
             .sin_port = hdr->port,
         };
     }
 }
 
 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
                   struct sockaddr_in6 *dst_addr,
                   struct cma_hdr *hdr,
                   __be16 local_port)
 {
     if (src_addr) {
         *src_addr = (struct sockaddr_in6) {
             .sin6_family = AF_INET6,
             .sin6_addr = hdr->dst_addr.ip6,
             .sin6_port = local_port,
         };
     }
 
     if (dst_addr) {
         *dst_addr = (struct sockaddr_in6) {
             .sin6_family = AF_INET6,
             .sin6_addr = hdr->src_addr.ip6,
             .sin6_port = hdr->port,
         };
     }
 }
 
 static u16 cma_port_from_service_id(__be64 service_id)
 {
     return (u16)be64_to_cpu(service_id);
 }
 
 static int cma_save_ip_info(struct sockaddr *src_addr,
                 struct sockaddr *dst_addr,
                 const struct ib_cm_event *ib_event,
                 __be64 service_id)
 {
     struct cma_hdr *hdr;
     __be16 port;
 
     hdr = ib_event->private_data;
     if (hdr->cma_version != CMA_VERSION)
         return -EINVAL;
 
     port = htons(cma_port_from_service_id(service_id));
 
     switch (cma_get_ip_ver(hdr)) {
     case 4:
         cma_save_ip4_info((struct sockaddr_in *)src_addr,
                   (struct sockaddr_in *)dst_addr, hdr, port);
         break;
     case 6:
         cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
                   (struct sockaddr_in6 *)dst_addr, hdr, port);
         break;
     default:
         return -EAFNOSUPPORT;
     }
 
     return 0;
 }
 
 static int cma_save_net_info(struct sockaddr *src_addr,
                  struct sockaddr *dst_addr,
                  const struct rdma_cm_id *listen_id,
                  const struct ib_cm_event *ib_event,
                  sa_family_t sa_family, __be64 service_id)
 {
     if (sa_family == AF_IB) {
         if (ib_event->event == IB_CM_REQ_RECEIVED)
             cma_save_ib_info(src_addr, dst_addr, listen_id,
                      ib_event->param.req_rcvd.primary_path);
         else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
             cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
         return 0;
     }
 
     return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
 }
 
 static int cma_save_req_info(const struct ib_cm_event *ib_event,
                  struct cma_req_info *req)
 {
     const struct ib_cm_req_event_param *req_param =
         &ib_event->param.req_rcvd;
     const struct ib_cm_sidr_req_event_param *sidr_param =
         &ib_event->param.sidr_req_rcvd;
 
     switch (ib_event->event) {
     case IB_CM_REQ_RECEIVED:
         req->device = req_param->listen_id->device;
         req->port   = req_param->port;
         memcpy(&req->local_gid, &req_param->primary_path->sgid,
                sizeof(req->local_gid));
         req->has_gid    = true;
         req->service_id = req_param->primary_path->service_id;
         req->pkey   = be16_to_cpu(req_param->primary_path->pkey);
         if (req->pkey != req_param->bth_pkey)
             pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
                         "RDMA CMA: in the future this may cause the request to be dropped\n",
                         req_param->bth_pkey, req->pkey);
         break;
     case IB_CM_SIDR_REQ_RECEIVED:
         req->device = sidr_param->listen_id->device;
         req->port   = sidr_param->port;
         req->has_gid    = false;
         req->service_id = sidr_param->service_id;
         req->pkey   = sidr_param->pkey;
         if (req->pkey != sidr_param->bth_pkey)
             pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
                         "RDMA CMA: in the future this may cause the request to be dropped\n",
                         sidr_param->bth_pkey, req->pkey);
         break;
     default:
         return -EINVAL;
     }
 
     return 0;
 }
 
 static bool validate_ipv4_net_dev(struct net_device *net_dev,
                   const struct sockaddr_in *dst_addr,
                   const struct sockaddr_in *src_addr)
 {
     __be32 daddr = dst_addr->sin_addr.s_addr,
            saddr = src_addr->sin_addr.s_addr;
     struct fib_result res;
     struct flowi4 fl4;
     int err;
     bool ret;
 
     if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
         ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
         ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
         ipv4_is_loopback(saddr))
         return false;
 
     memset(&fl4, 0, sizeof(fl4));
     fl4.flowi4_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,
                      NULL, strict);
     bool ret;
 
     if (!rt)
         return false;
 
     ret = rt->rt6i_idev->dev == net_dev;
     ip6_rt_put(rt);
 
     return ret;
 #else
     return false;
 #endif
 }
 
 static bool validate_net_dev(struct net_device *net_dev,
                  const struct sockaddr *daddr,
                  const struct sockaddr *saddr)
 {
     const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
     const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
     const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
     const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
 
     switch (daddr->sa_family) {
     case AF_INET:
         return saddr->sa_family == AF_INET &&
                validate_ipv4_net_dev(net_dev, daddr4, saddr4);
 
     case AF_INET6:
         return saddr->sa_family == AF_INET6 &&
                validate_ipv6_net_dev(net_dev, daddr6, saddr6);
 
     default:
         return false;
     }
 }
 
 static struct net_device *
 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
 {
     const struct ib_gid_attr *sgid_attr = NULL;
     struct net_device *ndev;
 
     if (ib_event->event == IB_CM_REQ_RECEIVED)
         sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
     else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
         sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
 
     if (!sgid_attr)
         return NULL;
 
     rcu_read_lock();
     ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
     if (IS_ERR(ndev))
         ndev = NULL;
     else
         dev_hold(ndev);
     rcu_read_unlock();
     return ndev;
 }
 
 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
                       struct cma_req_info *req)
 {
     struct sockaddr *listen_addr =
             (struct sockaddr *)&req->listen_addr_storage;
     struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
     struct net_device *net_dev;
     const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
     int err;
 
     err = cma_save_ip_info(listen_addr, src_addr, ib_event,
                    req->service_id);
     if (err)
         return ERR_PTR(err);
 
     if (rdma_protocol_roce(req->device, req->port))
         net_dev = roce_get_net_dev_by_cm_event(ib_event);
     else
         net_dev = ib_get_net_dev_by_params(req->device, req->port,
                            req->pkey,
                            gid, listen_addr);
     if (!net_dev)
         return ERR_PTR(-ENODEV);
 
     return net_dev;
 }
 
 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
 {
     return (be64_to_cpu(service_id) >> 16) & 0xffff;
 }
 
 static bool cma_match_private_data(struct rdma_id_private *id_priv,
                    const struct cma_hdr *hdr)
 {
     struct sockaddr *addr = cma_src_addr(id_priv);
     __be32 ip4_addr;
     struct in6_addr ip6_addr;
 
     if (cma_any_addr(addr) && !id_priv->afonly)
         return true;
 
     switch (addr->sa_family) {
     case AF_INET:
         ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
         if (cma_get_ip_ver(hdr) != 4)
             return false;
         if (!cma_any_addr(addr) &&
             hdr->dst_addr.ip4.addr != ip4_addr)
             return false;
         break;
     case AF_INET6:
         ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
         if (cma_get_ip_ver(hdr) != 6)
             return false;
         if (!cma_any_addr(addr) &&
             memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
             return false;
         break;
     case AF_IB:
         return true;
     default:
         return false;
     }
 
     return true;
 }
 
 static bool cma_protocol_roce(const struct rdma_cm_id *id)
 {
     struct ib_device *device = id->device;
     const u32 port_num = id->port_num ?: rdma_start_port(device);
 
     return rdma_protocol_roce(device, port_num);
 }
 
 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
 {
     const struct sockaddr *daddr =
             (const struct sockaddr *)&req->listen_addr_storage;
     const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
 
     /* Returns true if the req is for IPv6 link local */
     return (daddr->sa_family == AF_INET6 &&
         (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
 }
 
 static bool cma_match_net_dev(const struct rdma_cm_id *id,
                   const struct net_device *net_dev,
                   const struct cma_req_info *req)
 {
     const struct rdma_addr *addr = &id->route.addr;
 
     if (!net_dev)
         /* This request is an AF_IB request */
         return (!id->port_num || id->port_num == req->port) &&
                (addr->src_addr.ss_family == AF_IB);
 
     /*
      * If the request is not for IPv6 link local, allow matching
      * request to any netdevice of the one or multiport rdma device.
      */
     if (!cma_is_req_ipv6_ll(req))
         return true;
     /*
      * Net namespaces must match, and if the listner is listening
      * on a specific netdevice than netdevice must match as well.
      */
     if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
         (!!addr->dev_addr.bound_dev_if ==
          (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
         return true;
     else
         return false;
 }
 
 static struct rdma_id_private *cma_find_listener(
         const struct rdma_bind_list *bind_list,
         const struct ib_cm_id *cm_id,
         const struct ib_cm_event *ib_event,
         const struct cma_req_info *req,
         const struct net_device *net_dev)
 {
     struct rdma_id_private *id_priv, *id_priv_dev;
 
     lockdep_assert_held(&lock);
 
     if (!bind_list)
         return ERR_PTR(-EINVAL);
 
     hlist_for_each_entry(id_priv, &bind_list->owners, node) {
         if (cma_match_private_data(id_priv, ib_event->private_data)) {
             if (id_priv->id.device == cm_id->device &&
                 cma_match_net_dev(&id_priv->id, net_dev, req))
                 return id_priv;
             list_for_each_entry(id_priv_dev,
                         &id_priv->listen_list,
                         listen_item) {
                 if (id_priv_dev->id.device == cm_id->device &&
                     cma_match_net_dev(&id_priv_dev->id,
                               net_dev, req))
                     return id_priv_dev;
             }
         }
     }
 
     return ERR_PTR(-EINVAL);
 }
 
 static struct rdma_id_private *
 cma_ib_id_from_event(struct ib_cm_id *cm_id,
              const struct ib_cm_event *ib_event,
              struct cma_req_info *req,
              struct net_device **net_dev)
 {
     struct rdma_bind_list *bind_list;
     struct rdma_id_private *id_priv;
     int err;
 
     err = cma_save_req_info(ib_event, req);
     if (err)
         return ERR_PTR(err);
 
     *net_dev = cma_get_net_dev(ib_event, req);
     if (IS_ERR(*net_dev)) {
         if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
             /* Assuming the protocol is AF_IB */
             *net_dev = NULL;
         } else {
             return ERR_CAST(*net_dev);
         }
     }
 
     mutex_lock(&lock);
     /*
      * Net namespace might be getting deleted while route lookup,
      * cm_id lookup is in progress. Therefore, perform netdevice
      * validation, cm_id lookup under rcu lock.
      * RCU lock along with netdevice state check, synchronizes with
      * netdevice migrating to different net namespace and also avoids
      * case where net namespace doesn't get deleted while lookup is in
      * progress.
      * If the device state is not IFF_UP, its properties such as ifindex
      * and nd_net cannot be trusted to remain valid without rcu lock.
      * net/core/dev.c change_net_namespace() ensures to synchronize with
      * ongoing operations on net device after device is closed using
      * synchronize_net().
      */
     rcu_read_lock();
     if (*net_dev) {
         /*
          * If netdevice is down, it is likely that it is administratively
          * down or it might be migrating to different namespace.
          * In that case avoid further processing, as the net namespace
          * or ifindex may change.
          */
         if (((*net_dev)->flags & IFF_UP) == 0) {
             id_priv = ERR_PTR(-EHOSTUNREACH);
             goto err;
         }
 
         if (!validate_net_dev(*net_dev,
                  (struct sockaddr *)&req->src_addr_storage,
                  (struct sockaddr *)&req->listen_addr_storage)) {
             id_priv = ERR_PTR(-EHOSTUNREACH);
             goto err;
         }
     }
 
     bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
                 rdma_ps_from_service_id(req->service_id),
                 cma_port_from_service_id(req->service_id));
     id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
 err:
     rcu_read_unlock();
     mutex_unlock(&lock);
     if (IS_ERR(id_priv) && *net_dev) {
         dev_put(*net_dev);
         *net_dev = NULL;
     }
     return id_priv;
 }
 
 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
 {
     return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
 }
 
 static void cma_cancel_route(struct rdma_id_private *id_priv)
 {
     if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
         if (id_priv->query)
             ib_sa_cancel_query(id_priv->query_id, id_priv->query);
     }
 }
 
 static void _cma_cancel_listens(struct rdma_id_private *id_priv)
 {
     struct rdma_id_private *dev_id_priv;
 
     lockdep_assert_held(&lock);
 
     /*
      * Remove from listen_any_list to prevent added devices from spawning
      * additional listen requests.
      */
     list_del_init(&id_priv->listen_any_item);
 
     while (!list_empty(&id_priv->listen_list)) {
         dev_id_priv =
             list_first_entry(&id_priv->listen_list,
                      struct rdma_id_private, listen_item);
         /* sync with device removal to avoid duplicate destruction */
         list_del_init(&dev_id_priv->device_item);
         list_del_init(&dev_id_priv->listen_item);
         mutex_unlock(&lock);
 
         rdma_destroy_id(&dev_id_priv->id);
         mutex_lock(&lock);
     }
 }
 
 static void cma_cancel_listens(struct rdma_id_private *id_priv)
 {
     mutex_lock(&lock);
     _cma_cancel_listens(id_priv);
     mutex_unlock(&lock);
 }
 
 static void cma_cancel_operation(struct rdma_id_private *id_priv,
                  enum rdma_cm_state state)
 {
     switch (state) {
     case RDMA_CM_ADDR_QUERY:
         /*
          * We can avoid doing the rdma_addr_cancel() based on state,
          * only RDMA_CM_ADDR_QUERY has a work that could still execute.
          * Notice that the addr_handler work could still be exiting
          * outside this state, however due to the interaction with the
          * handler_mutex the work is guaranteed not to touch id_priv
          * during exit.
          */
         rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
         break;
     case RDMA_CM_ROUTE_QUERY:
         cma_cancel_route(id_priv);
         break;
     case RDMA_CM_LISTEN:
         if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
             cma_cancel_listens(id_priv);
         break;
     default:
         break;
     }
 }
 
 static void cma_release_port(struct rdma_id_private *id_priv)
 {
     struct rdma_bind_list *bind_list = id_priv->bind_list;
     struct net *net = id_priv->id.route.addr.dev_addr.net;
 
     if (!bind_list)
         return;
 
     mutex_lock(&lock);
     hlist_del(&id_priv->node);
     if (hlist_empty(&bind_list->owners)) {
         cma_ps_remove(net, bind_list->ps, bind_list->port);
         kfree(bind_list);
     }
     mutex_unlock(&lock);
 }
 
 static void destroy_mc(struct rdma_id_private *id_priv,
                struct cma_multicast *mc)
 {
     bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
 
     if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
         ib_sa_free_multicast(mc->sa_mc);
 
     if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
         struct rdma_dev_addr *dev_addr =
             &id_priv->id.route.addr.dev_addr;
         struct net_device *ndev = NULL;
 
         if (dev_addr->bound_dev_if)
             ndev = dev_get_by_index(dev_addr->net,
                         dev_addr->bound_dev_if);
         if (ndev && !send_only) {
             enum ib_gid_type gid_type;
             union ib_gid mgid;
 
             gid_type = id_priv->cma_dev->default_gid_type
                        [id_priv->id.port_num -
                         rdma_start_port(
                             id_priv->cma_dev->device)];
             cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
                       gid_type);
             cma_igmp_send(ndev, &mgid, false);
         }
         dev_put(ndev);
 
         cancel_work_sync(&mc->iboe_join.work);
     }
     kfree(mc);
 }
 
 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 {
     struct cma_multicast *mc;
 
     while (!list_empty(&id_priv->mc_list)) {
         mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
                       list);
         list_del(&mc->list);
         destroy_mc(id_priv, mc);
     }
 }
 
 static void _destroy_id(struct rdma_id_private *id_priv,
             enum rdma_cm_state state)
 {
     cma_cancel_operation(id_priv, state);
 
     rdma_restrack_del(&id_priv->res);
     cma_remove_id_from_tree(id_priv);
     if (id_priv->cma_dev) {
         if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
             if (id_priv->cm_id.ib)
                 ib_destroy_cm_id(id_priv->cm_id.ib);
         } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
             if (id_priv->cm_id.iw)
                 iw_destroy_cm_id(id_priv->cm_id.iw);
         }
         cma_leave_mc_groups(id_priv);
         cma_release_dev(id_priv);
     }
 
     cma_release_port(id_priv);
     cma_id_put(id_priv);
     wait_for_completion(&id_priv->comp);
 
     if (id_priv->internal_id)
         cma_id_put(id_priv->id.context);
 
     kfree(id_priv->id.route.path_rec);
 
     put_net(id_priv->id.route.addr.dev_addr.net);
     kfree(id_priv);
 }
 
 /*
  * destroy an ID from within the handler_mutex. This ensures that no other
  * handlers can start running concurrently.
  */
 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
     __releases(&idprv->handler_mutex)
 {
     enum rdma_cm_state state;
     unsigned long flags;
 
     trace_cm_id_destroy(id_priv);
 
     /*
      * Setting the state to destroyed under the handler mutex provides a
      * fence against calling handler callbacks. If this is invoked due to
      * the failure of a handler callback then it guarentees that no future
      * handlers will be called.
      */
     lockdep_assert_held(&id_priv->handler_mutex);
     spin_lock_irqsave(&id_priv->lock, flags);
     state = id_priv->state;
     id_priv->state = RDMA_CM_DESTROYING;
     spin_unlock_irqrestore(&id_priv->lock, flags);
     mutex_unlock(&id_priv->handler_mutex);
     _destroy_id(id_priv, state);
 }
 
 void rdma_destroy_id(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
 
     mutex_lock(&id_priv->handler_mutex);
     destroy_id_handler_unlock(id_priv);
 }
 EXPORT_SYMBOL(rdma_destroy_id);
 
 static int cma_rep_recv(struct rdma_id_private *id_priv)
 {
     int ret;
 
     ret = cma_modify_qp_rtr(id_priv, NULL);
     if (ret)
         goto reject;
 
     ret = cma_modify_qp_rts(id_priv, NULL);
     if (ret)
         goto reject;
 
     trace_cm_send_rtu(id_priv);
     ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
     if (ret)
         goto reject;
 
     return 0;
 reject:
     pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
     cma_modify_qp_err(id_priv);
     trace_cm_send_rej(id_priv);
     ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
                NULL, 0, NULL, 0);
     return ret;
 }
 
 static void cma_set_rep_event_data(struct rdma_cm_event *event,
                    const struct ib_cm_rep_event_param *rep_data,
                    void *private_data)
 {
     event->param.conn.private_data = private_data;
     event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
     event->param.conn.responder_resources = rep_data->responder_resources;
     event->param.conn.initiator_depth = rep_data->initiator_depth;
     event->param.conn.flow_control = rep_data->flow_control;
     event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
     event->param.conn.srq = rep_data->srq;
     event->param.conn.qp_num = rep_data->remote_qpn;
 
     event->ece.vendor_id = rep_data->ece.vendor_id;
     event->ece.attr_mod = rep_data->ece.attr_mod;
 }
 
 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
                 struct rdma_cm_event *event)
 {
     int ret;
 
     lockdep_assert_held(&id_priv->handler_mutex);
 
     trace_cm_event_handler(id_priv, event);
     ret = id_priv->id.event_handler(&id_priv->id, event);
     trace_cm_event_done(id_priv, event, ret);
     return ret;
 }
 
 static int cma_ib_handler(struct ib_cm_id *cm_id,
               const struct ib_cm_event *ib_event)
 {
     struct rdma_id_private *id_priv = cm_id->context;
     struct rdma_cm_event event = {};
     enum rdma_cm_state state;
     int ret;
 
     mutex_lock(&id_priv->handler_mutex);
     state = READ_ONCE(id_priv->state);
     if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
          state != RDMA_CM_CONNECT) ||
         (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
          state != RDMA_CM_DISCONNECT))
         goto out;
 
     switch (ib_event->event) {
     case IB_CM_REQ_ERROR:
     case IB_CM_REP_ERROR:
         event.event = RDMA_CM_EVENT_UNREACHABLE;
         event.status = -ETIMEDOUT;
         break;
     case IB_CM_REP_RECEIVED:
         if (state == RDMA_CM_CONNECT &&
             (id_priv->id.qp_type != IB_QPT_UD)) {
             trace_cm_send_mra(id_priv);
             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;
         fallthrough;
     case IB_CM_DREQ_RECEIVED:
     case IB_CM_DREP_RECEIVED:
         if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
                    RDMA_CM_DISCONNECT))
             goto out;
         event.event = RDMA_CM_EVENT_DISCONNECTED;
         break;
     case IB_CM_TIMEWAIT_EXIT:
         event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
         break;
     case IB_CM_MRA_RECEIVED:
         /* ignore event */
         goto out;
     case IB_CM_REJ_RECEIVED:
         pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
                                         ib_event->param.rej_rcvd.reason));
         cma_modify_qp_err(id_priv);
         event.status = ib_event->param.rej_rcvd.reason;
         event.event = RDMA_CM_EVENT_REJECTED;
         event.param.conn.private_data = ib_event->private_data;
         event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
         break;
     default:
         pr_err("RDMA CMA: unexpected IB CM event: %d\n",
                ib_event->event);
         goto out;
     }
 
     ret = cma_cm_event_handler(id_priv, &event);
     if (ret) {
         /* Destroy the CM ID by returning a non-zero value. */
         id_priv->cm_id.ib = NULL;
         destroy_id_handler_unlock(id_priv);
         return ret;
     }
 out:
     mutex_unlock(&id_priv->handler_mutex);
     return 0;
 }
 
 static struct rdma_id_private *
 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
            const struct ib_cm_event *ib_event,
            struct net_device *net_dev)
 {
     struct rdma_id_private *listen_id_priv;
     struct rdma_id_private *id_priv;
     struct rdma_cm_id *id;
     struct rdma_route *rt;
     const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
     struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
     const __be64 service_id =
         ib_event->param.req_rcvd.primary_path->service_id;
     int ret;
 
     listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
     id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
                    listen_id->event_handler, listen_id->context,
                    listen_id->ps,
                    ib_event->param.req_rcvd.qp_type,
                    listen_id_priv);
     if (IS_ERR(id_priv))
         return NULL;
 
     id = &id_priv->id;
     if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
                   (struct sockaddr *)&id->route.addr.dst_addr,
                   listen_id, ib_event, ss_family, service_id))
         goto err;
 
     rt = &id->route;
     rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
     rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
                      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) {
         rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
     } else {
         if (!cma_protocol_roce(listen_id) &&
             cma_any_addr(cma_src_addr(id_priv))) {
             rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
             rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
             ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
         } else if (!cma_any_addr(cma_src_addr(id_priv))) {
             ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
             if (ret)
                 goto err;
         }
     }
     rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
 
     id_priv->state = RDMA_CM_CONNECT;
     return id_priv;
 
 err:
     rdma_destroy_id(id);
     return NULL;
 }
 
 static struct rdma_id_private *
 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
           const struct ib_cm_event *ib_event,
           struct net_device *net_dev)
 {
     const struct rdma_id_private *listen_id_priv;
     struct rdma_id_private *id_priv;
     struct rdma_cm_id *id;
     const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
     struct net *net = listen_id->route.addr.dev_addr.net;
     int ret;
 
     listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
     id_priv = __rdma_create_id(net, listen_id->event_handler,
                    listen_id->context, listen_id->ps, IB_QPT_UD,
                    listen_id_priv);
     if (IS_ERR(id_priv))
         return NULL;
 
     id = &id_priv->id;
     if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
                   (struct sockaddr *)&id->route.addr.dst_addr,
                   listen_id, ib_event, ss_family,
                   ib_event->param.sidr_req_rcvd.service_id))
         goto err;
 
     if (net_dev) {
         rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
     } else {
         if (!cma_any_addr(cma_src_addr(id_priv))) {
             ret = cma_translate_addr(cma_src_addr(id_priv),
                          &id->route.addr.dev_addr);
             if (ret)
                 goto err;
         }
     }
 
     id_priv->state = RDMA_CM_CONNECT;
     return id_priv;
 err:
     rdma_destroy_id(id);
     return NULL;
 }
 
 static void cma_set_req_event_data(struct rdma_cm_event *event,
                    const struct ib_cm_req_event_param *req_data,
                    void *private_data, int offset)
 {
     event->param.conn.private_data = private_data + offset;
     event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
     event->param.conn.responder_resources = req_data->responder_resources;
     event->param.conn.initiator_depth = req_data->initiator_depth;
     event->param.conn.flow_control = req_data->flow_control;
     event->param.conn.retry_count = req_data->retry_count;
     event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
     event->param.conn.srq = req_data->srq;
     event->param.conn.qp_num = req_data->remote_qpn;
 
     event->ece.vendor_id = req_data->ece.vendor_id;
     event->ece.attr_mod = req_data->ece.attr_mod;
 }
 
 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
                     const struct ib_cm_event *ib_event)
 {
     return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
          (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
         ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
          (id->qp_type == IB_QPT_UD)) ||
         (!id->qp_type));
 }
 
 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
                   const struct ib_cm_event *ib_event)
 {
     struct rdma_id_private *listen_id, *conn_id = NULL;
     struct rdma_cm_event event = {};
     struct cma_req_info req = {};
     struct net_device *net_dev;
     u8 offset;
     int ret;
 
     listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
     if (IS_ERR(listen_id))
         return PTR_ERR(listen_id);
 
     trace_cm_req_handler(listen_id, ib_event->event);
     if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
         ret = -EINVAL;
         goto net_dev_put;
     }
 
     mutex_lock(&listen_id->handler_mutex);
     if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
         ret = -ECONNABORTED;
         goto err_unlock;
     }
 
     offset = cma_user_data_offset(listen_id);
     event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
     if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
         conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
         event.param.ud.private_data = ib_event->private_data + offset;
         event.param.ud.private_data_len =
                 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
     } else {
         conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
         cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
                        ib_event->private_data, offset);
     }
     if (!conn_id) {
         ret = -ENOMEM;
         goto err_unlock;
     }
 
     mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
     ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
     if (ret) {
         destroy_id_handler_unlock(conn_id);
         goto err_unlock;
     }
 
     conn_id->cm_id.ib = cm_id;
     cm_id->context = conn_id;
     cm_id->cm_handler = cma_ib_handler;
 
     ret = cma_cm_event_handler(conn_id, &event);
     if (ret) {
         /* Destroy the CM ID by returning a non-zero value. */
         conn_id->cm_id.ib = NULL;
         mutex_unlock(&listen_id->handler_mutex);
         destroy_id_handler_unlock(conn_id);
         goto net_dev_put;
     }
 
     if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
         conn_id->id.qp_type != IB_QPT_UD) {
         trace_cm_send_mra(cm_id->context);
         ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
     }
     mutex_unlock(&conn_id->handler_mutex);
 
 err_unlock:
     mutex_unlock(&listen_id->handler_mutex);
 
 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);
 
 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
             union ib_gid *dgid)
 {
     struct rdma_addr *addr = &cm_id->route.addr;
 
     if (!cm_id->device) {
         if (sgid)
             memset(sgid, 0, sizeof(*sgid));
         if (dgid)
             memset(dgid, 0, sizeof(*dgid));
         return;
     }
 
     if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
         if (sgid)
             rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
         if (dgid)
             rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
     } else {
         if (sgid)
             rdma_addr_get_sgid(&addr->dev_addr, sgid);
         if (dgid)
             rdma_addr_get_dgid(&addr->dev_addr, dgid);
     }
 }
 EXPORT_SYMBOL(rdma_read_gids);
 
 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
 {
     struct rdma_id_private *id_priv = iw_id->context;
     struct rdma_cm_event event = {};
     int ret = 0;
     struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
     struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
 
     mutex_lock(&id_priv->handler_mutex);
     if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
         goto out;
 
     switch (iw_event->event) {
     case IW_CM_EVENT_CLOSE:
         event.event = RDMA_CM_EVENT_DISCONNECTED;
         break;
     case IW_CM_EVENT_CONNECT_REPLY:
         memcpy(cma_src_addr(id_priv), laddr,
                rdma_addr_size(laddr));
         memcpy(cma_dst_addr(id_priv), raddr,
                rdma_addr_size(raddr));
         switch (iw_event->status) {
         case 0:
             event.event = RDMA_CM_EVENT_ESTABLISHED;
             event.param.conn.initiator_depth = iw_event->ird;
             event.param.conn.responder_resources = iw_event->ord;
             break;
         case -ECONNRESET:
         case -ECONNREFUSED:
             event.event = RDMA_CM_EVENT_REJECTED;
             break;
         case -ETIMEDOUT:
             event.event = RDMA_CM_EVENT_UNREACHABLE;
             break;
         default:
             event.event = RDMA_CM_EVENT_CONNECT_ERROR;
             break;
         }
         break;
     case IW_CM_EVENT_ESTABLISHED:
         event.event = RDMA_CM_EVENT_ESTABLISHED;
         event.param.conn.initiator_depth = iw_event->ird;
         event.param.conn.responder_resources = iw_event->ord;
         break;
     default:
         goto out;
     }
 
     event.status = iw_event->status;
     event.param.conn.private_data = iw_event->private_data;
     event.param.conn.private_data_len = iw_event->private_data_len;
     ret = cma_cm_event_handler(id_priv, &event);
     if (ret) {
         /* Destroy the CM ID by returning a non-zero value. */
         id_priv->cm_id.iw = NULL;
         destroy_id_handler_unlock(id_priv);
         return ret;
     }
 
 out:
     mutex_unlock(&id_priv->handler_mutex);
     return ret;
 }
 
 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
                    struct iw_cm_event *iw_event)
 {
     struct rdma_id_private *listen_id, *conn_id;
     struct rdma_cm_event event = {};
     int ret = -ECONNABORTED;
     struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
     struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
 
     event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
     event.param.conn.private_data = iw_event->private_data;
     event.param.conn.private_data_len = iw_event->private_data_len;
     event.param.conn.initiator_depth = iw_event->ird;
     event.param.conn.responder_resources = iw_event->ord;
 
     listen_id = cm_id->context;
 
     mutex_lock(&listen_id->handler_mutex);
     if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
         goto out;
 
     /* Create a new RDMA id for the new IW CM ID */
     conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
                    listen_id->id.event_handler,
                    listen_id->id.context, RDMA_PS_TCP,
                    IB_QPT_RC, listen_id);
     if (IS_ERR(conn_id)) {
         ret = -ENOMEM;
         goto out;
     }
     mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
     conn_id->state = RDMA_CM_CONNECT;
 
     ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
     if (ret) {
         mutex_unlock(&listen_id->handler_mutex);
         destroy_id_handler_unlock(conn_id);
         return ret;
     }
 
     ret = cma_iw_acquire_dev(conn_id, listen_id);
     if (ret) {
         mutex_unlock(&listen_id->handler_mutex);
         destroy_id_handler_unlock(conn_id);
         return ret;
     }
 
     conn_id->cm_id.iw = cm_id;
     cm_id->context = conn_id;
     cm_id->cm_handler = cma_iw_handler;
 
     memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
     memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
 
     ret = cma_cm_event_handler(conn_id, &event);
     if (ret) {
         /* User wants to destroy the CM ID */
         conn_id->cm_id.iw = NULL;
         mutex_unlock(&listen_id->handler_mutex);
         destroy_id_handler_unlock(conn_id);
         return ret;
     }
 
     mutex_unlock(&conn_id->handler_mutex);
 
 out:
     mutex_unlock(&listen_id->handler_mutex);
     return ret;
 }
 
 static int cma_ib_listen(struct rdma_id_private *id_priv)
 {
     struct sockaddr *addr;
     struct ib_cm_id *id;
     __be64 svc_id;
 
     addr = cma_src_addr(id_priv);
     svc_id = rdma_get_service_id(&id_priv->id, addr);
     id = ib_cm_insert_listen(id_priv->id.device,
                  cma_ib_req_handler, svc_id);
     if (IS_ERR(id))
         return PTR_ERR(id);
     id_priv->cm_id.ib = id;
 
     return 0;
 }
 
 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
 {
     int ret;
     struct iw_cm_id *id;
 
     id = iw_create_cm_id(id_priv->id.device,
                  iw_conn_req_handler,
                  id_priv);
     if (IS_ERR(id))
         return PTR_ERR(id);
 
     mutex_lock(&id_priv->qp_mutex);
     id->tos = id_priv->tos;
     id->tos_set = id_priv->tos_set;
     mutex_unlock(&id_priv->qp_mutex);
     id->afonly = id_priv->afonly;
     id_priv->cm_id.iw = id;
 
     memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
            rdma_addr_size(cma_src_addr(id_priv)));
 
     ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
 
     if (ret) {
         iw_destroy_cm_id(id_priv->cm_id.iw);
         id_priv->cm_id.iw = NULL;
     }
 
     return ret;
 }
 
 static int cma_listen_handler(struct rdma_cm_id *id,
                   struct rdma_cm_event *event)
 {
     struct rdma_id_private *id_priv = id->context;
 
     /* Listening IDs are always destroyed on removal */
     if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
         return -1;
 
     id->context = id_priv->id.context;
     id->event_handler = id_priv->id.event_handler;
     trace_cm_event_handler(id_priv, event);
     return id_priv->id.event_handler(id, event);
 }
 
 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
                  struct cma_device *cma_dev,
                  struct rdma_id_private **to_destroy)
 {
     struct rdma_id_private *dev_id_priv;
     struct net *net = id_priv->id.route.addr.dev_addr.net;
     int ret;
 
     lockdep_assert_held(&lock);
 
     *to_destroy = NULL;
     if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
         return 0;
 
     dev_id_priv =
         __rdma_create_id(net, cma_listen_handler, id_priv,
                  id_priv->id.ps, id_priv->id.qp_type, id_priv);
     if (IS_ERR(dev_id_priv))
         return PTR_ERR(dev_id_priv);
 
     dev_id_priv->state = RDMA_CM_ADDR_BOUND;
     memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
            rdma_addr_size(cma_src_addr(id_priv)));
 
     _cma_attach_to_dev(dev_id_priv, cma_dev);
     rdma_restrack_add(&dev_id_priv->res);
     cma_id_get(id_priv);
     dev_id_priv->internal_id = 1;
     dev_id_priv->afonly = id_priv->afonly;
     mutex_lock(&id_priv->qp_mutex);
     dev_id_priv->tos_set = id_priv->tos_set;
     dev_id_priv->tos = id_priv->tos;
     mutex_unlock(&id_priv->qp_mutex);
 
     ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
     if (ret)
         goto err_listen;
     list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
     return 0;
 err_listen:
     /* Caller must destroy this after releasing lock */
     *to_destroy = dev_id_priv;
     dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
     return ret;
 }
 
 static int cma_listen_on_all(struct rdma_id_private *id_priv)
 {
     struct rdma_id_private *to_destroy;
     struct cma_device *cma_dev;
     int ret;
 
     mutex_lock(&lock);
     list_add_tail(&id_priv->listen_any_item, &listen_any_list);
     list_for_each_entry(cma_dev, &dev_list, list) {
         ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
         if (ret) {
             /* Prevent racing with cma_process_remove() */
             if (to_destroy)
                 list_del_init(&to_destroy->device_item);
             goto err_listen;
         }
     }
     mutex_unlock(&lock);
     return 0;
 
 err_listen:
     _cma_cancel_listens(id_priv);
     mutex_unlock(&lock);
     if (to_destroy)
         rdma_destroy_id(&to_destroy->id);
     return ret;
 }
 
 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
 {
     struct rdma_id_private *id_priv;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     mutex_lock(&id_priv->qp_mutex);
     id_priv->tos = (u8) tos;
     id_priv->tos_set = true;
     mutex_unlock(&id_priv->qp_mutex);
 }
 EXPORT_SYMBOL(rdma_set_service_type);
 
 /**
  * rdma_set_ack_timeout() - Set the ack timeout of QP associated
  *                          with a connection identifier.
  * @id: Communication identifier to associated with service type.
  * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
  *
  * This function should be called before rdma_connect() on active side,
  * and on passive side before rdma_accept(). It is applicable to primary
  * path only. The timeout will affect the local side of the QP, it is not
  * negotiated with remote side and zero disables the timer. In case it is
  * set before rdma_resolve_route, the value will also be used to determine
  * PacketLifeTime for RoCE.
  *
  * Return: 0 for success
  */
 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
 {
     struct rdma_id_private *id_priv;
 
     if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI)
         return -EINVAL;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     mutex_lock(&id_priv->qp_mutex);
     id_priv->timeout = timeout;
     id_priv->timeout_set = true;
     mutex_unlock(&id_priv->qp_mutex);
 
     return 0;
 }
 EXPORT_SYMBOL(rdma_set_ack_timeout);
 
 /**
  * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
  *                QP associated with a connection identifier.
  * @id: Communication identifier to associated with service type.
  * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
  *         Timer Field" in the IBTA specification.
  *
  * This function should be called before rdma_connect() on active
  * side, and on passive side before rdma_accept(). The timer value
  * will be associated with the local QP. When it receives a send it is
  * not read to handle, typically if the receive queue is empty, an RNR
  * Retry NAK is returned to the requester with the min_rnr_timer
  * encoded. The requester will then wait at least the time specified
  * in the NAK before retrying. The default is zero, which translates
  * to a minimum RNR Timer value of 655 ms.
  *
  * Return: 0 for success
  */
 int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
 {
     struct rdma_id_private *id_priv;
 
     /* It is a five-bit value */
     if (min_rnr_timer & 0xe0)
         return -EINVAL;
 
     if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
         return -EINVAL;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     mutex_lock(&id_priv->qp_mutex);
     id_priv->min_rnr_timer = min_rnr_timer;
     id_priv->min_rnr_timer_set = true;
     mutex_unlock(&id_priv->qp_mutex);
 
     return 0;
 }
 EXPORT_SYMBOL(rdma_set_min_rnr_timer);
 
 static 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,
                   unsigned long timeout_ms, struct cma_work *work)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     struct sa_path_rec path_rec;
     ib_sa_comp_mask comp_mask;
     struct sockaddr_in6 *sin6;
     struct sockaddr_ib *sib;
 
     memset(&path_rec, 0, sizeof path_rec);
 
     if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
         path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
     else
         path_rec.rec_type = SA_PATH_REC_TYPE_IB;
     rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
     rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
     path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
     path_rec.numb_path = 1;
     path_rec.reversible = 1;
     path_rec.service_id = rdma_get_service_id(&id_priv->id,
                           cma_dst_addr(id_priv));
 
     comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
             IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
             IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
 
     switch (cma_family(id_priv)) {
     case AF_INET:
         path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
         comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
         break;
     case AF_INET6:
         sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
         path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
         comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
         break;
     case AF_IB:
         sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
         path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
         comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
         break;
     }
 
     id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
                            id_priv->id.port_num, &path_rec,
                            comp_mask, timeout_ms,
                            GFP_KERNEL, cma_query_handler,
                            work, &id_priv->query);
 
     return (id_priv->query_id < 0) ? id_priv->query_id : 0;
 }
 
 static void cma_iboe_join_work_handler(struct work_struct *work)
 {
     struct cma_multicast *mc =
         container_of(work, struct cma_multicast, iboe_join.work);
     struct rdma_cm_event *event = &mc->iboe_join.event;
     struct rdma_id_private *id_priv = mc->id_priv;
     int ret;
 
     mutex_lock(&id_priv->handler_mutex);
     if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
         READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
         goto out_unlock;
 
     ret = cma_cm_event_handler(id_priv, event);
     WARN_ON(ret);
 
 out_unlock:
     mutex_unlock(&id_priv->handler_mutex);
     if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
         rdma_destroy_ah_attr(&event->param.ud.ah_attr);
 }
 
 static void cma_work_handler(struct work_struct *_work)
 {
     struct cma_work *work = container_of(_work, struct cma_work, work);
     struct rdma_id_private *id_priv = work->id;
 
     mutex_lock(&id_priv->handler_mutex);
     if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
         READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
         goto out_unlock;
     if (work->old_state != 0 || work->new_state != 0) {
         if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
             goto out_unlock;
     }
 
     if (cma_cm_event_handler(id_priv, &work->event)) {
         cma_id_put(id_priv);
         destroy_id_handler_unlock(id_priv);
         goto out_free;
     }
 
 out_unlock:
     mutex_unlock(&id_priv->handler_mutex);
     cma_id_put(id_priv);
 out_free:
     if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
         rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
     kfree(work);
 }
 
 static void cma_init_resolve_route_work(struct cma_work *work,
                     struct rdma_id_private *id_priv)
 {
     work->id = id_priv;
     INIT_WORK(&work->work, cma_work_handler);
     work->old_state = RDMA_CM_ROUTE_QUERY;
     work->new_state = RDMA_CM_ROUTE_RESOLVED;
     work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
 }
 
 static void enqueue_resolve_addr_work(struct cma_work *work,
                       struct rdma_id_private *id_priv)
 {
     /* Balances with cma_id_put() in cma_work_handler */
     cma_id_get(id_priv);
 
     work->id = id_priv;
     INIT_WORK(&work->work, cma_work_handler);
     work->old_state = RDMA_CM_ADDR_QUERY;
     work->new_state = RDMA_CM_ADDR_RESOLVED;
     work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
 
     queue_work(cma_wq, &work->work);
 }
 
 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
                 unsigned long timeout_ms)
 {
     struct rdma_route *route = &id_priv->id.route;
     struct cma_work *work;
     int ret;
 
     work = kzalloc(sizeof *work, GFP_KERNEL);
     if (!work)
         return -ENOMEM;
 
     cma_init_resolve_route_work(work, id_priv);
 
     if (!route->path_rec)
         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;
 }
 
 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
                        unsigned long supported_gids,
                        enum ib_gid_type default_gid)
 {
     if ((network_type == RDMA_NETWORK_IPV4 ||
          network_type == RDMA_NETWORK_IPV6) &&
         test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
         return IB_GID_TYPE_ROCE_UDP_ENCAP;
 
     return default_gid;
 }
 
 /*
  * cma_iboe_set_path_rec_l2_fields() is helper function which sets
  * path record type based on GID type.
  * It also sets up other L2 fields which includes destination mac address
  * netdev ifindex, of the path record.
  * It returns the netdev of the bound interface for this path record entry.
  */
 static struct net_device *
 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
 {
     struct rdma_route *route = &id_priv->id.route;
     enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
     struct rdma_addr *addr = &route->addr;
     unsigned long supported_gids;
     struct net_device *ndev;
 
     if (!addr->dev_addr.bound_dev_if)
         return NULL;
 
     ndev = dev_get_by_index(addr->dev_addr.net,
                 addr->dev_addr.bound_dev_if);
     if (!ndev)
         return NULL;
 
     supported_gids = roce_gid_type_mask_support(id_priv->id.device,
                             id_priv->id.port_num);
     gid_type = cma_route_gid_type(addr->dev_addr.network,
                       supported_gids,
                       id_priv->gid_type);
     /* Use the hint from IP Stack to select GID Type */
     if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
         gid_type = ib_network_to_gid_type(addr->dev_addr.network);
     route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
 
     route->path_rec->roce.route_resolved = true;
     sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
     return ndev;
 }
 
 int rdma_set_ib_path(struct rdma_cm_id *id,
              struct sa_path_rec *path_rec)
 {
     struct rdma_id_private *id_priv;
     struct net_device *ndev;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
                RDMA_CM_ROUTE_RESOLVED))
         return -EINVAL;
 
     id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
                      GFP_KERNEL);
     if (!id->route.path_rec) {
         ret = -ENOMEM;
         goto err;
     }
 
     if (rdma_protocol_roce(id->device, id->port_num)) {
         ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
         if (!ndev) {
             ret = -ENODEV;
             goto err_free;
         }
         dev_put(ndev);
     }
 
     id->route.num_paths = 1;
     return 0;
 
 err_free:
     kfree(id->route.path_rec);
     id->route.path_rec = NULL;
 err:
     cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
     return ret;
 }
 EXPORT_SYMBOL(rdma_set_ib_path);
 
 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
 {
     struct cma_work *work;
 
     work = kzalloc(sizeof *work, GFP_KERNEL);
     if (!work)
         return -ENOMEM;
 
     cma_init_resolve_route_work(work, id_priv);
     queue_work(cma_wq, &work->work);
     return 0;
 }
 
 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
 {
     struct net_device *dev;
 
     dev = vlan_dev_real_dev(vlan_ndev);
     if (dev->num_tc)
         return netdev_get_prio_tc_map(dev, prio);
 
     return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
         VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
 }
 
 struct iboe_prio_tc_map {
     int input_prio;
     int output_tc;
     bool found;
 };
 
 static int get_lower_vlan_dev_tc(struct net_device *dev,
                  struct netdev_nested_priv *priv)
 {
     struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
 
     if (is_vlan_dev(dev))
         map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
     else if (dev->num_tc)
         map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
     else
         map->output_tc = 0;
     /* We are interested only in first level VLAN device, so always
      * return 1 to stop iterating over next level devices.
      */
     map->found = true;
     return 1;
 }
 
 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
 {
     struct iboe_prio_tc_map prio_tc_map = {};
     int prio = rt_tos2priority(tos);
     struct netdev_nested_priv priv;
 
     /* If VLAN device, get it directly from the VLAN netdev */
     if (is_vlan_dev(ndev))
         return get_vlan_ndev_tc(ndev, prio);
 
     prio_tc_map.input_prio = prio;
     priv.data = (void *)&prio_tc_map;
     rcu_read_lock();
     netdev_walk_all_lower_dev_rcu(ndev,
                       get_lower_vlan_dev_tc,
                       &priv);
     rcu_read_unlock();
     /* If map is found from lower device, use it; Otherwise
      * continue with the current netdevice to get priority to tc map.
      */
     if (prio_tc_map.found)
         return prio_tc_map.output_tc;
     else if (ndev->num_tc)
         return netdev_get_prio_tc_map(ndev, prio);
     else
         return 0;
 }
 
 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
 {
     struct sockaddr_in6 *addr6;
     u16 dport, sport;
     u32 hash, fl;
 
     addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
     fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
     if ((cma_family(id_priv) != AF_INET6) || !fl) {
         dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
         sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
         hash = (u32)sport * 31 + dport;
         fl = hash & IB_GRH_FLOWLABEL_MASK;
     }
 
     return cpu_to_be32(fl);
 }
 
 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 {
     struct rdma_route *route = &id_priv->id.route;
     struct rdma_addr *addr = &route->addr;
     struct cma_work *work;
     int ret;
     struct net_device *ndev;
 
     u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
                     rdma_start_port(id_priv->cma_dev->device)];
     u8 tos;
 
     mutex_lock(&id_priv->qp_mutex);
     tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
     mutex_unlock(&id_priv->qp_mutex);
 
     work = kzalloc(sizeof *work, GFP_KERNEL);
     if (!work)
         return -ENOMEM;
 
     route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
     if (!route->path_rec) {
         ret = -ENOMEM;
         goto err1;
     }
 
     route->num_paths = 1;
 
     ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
     if (!ndev) {
         ret = -ENODEV;
         goto err2;
     }
 
     rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
             &route->path_rec->sgid);
     rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
             &route->path_rec->dgid);
 
     if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
         /* TODO: get the hoplimit from the inet/inet6 device */
         route->path_rec->hop_limit = addr->dev_addr.hoplimit;
     else
         route->path_rec->hop_limit = 1;
     route->path_rec->reversible = 1;
     route->path_rec->pkey = cpu_to_be16(0xffff);
     route->path_rec->mtu_selector = IB_SA_EQ;
     route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
     route->path_rec->traffic_class = tos;
     route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
     route->path_rec->rate_selector = IB_SA_EQ;
     route->path_rec->rate = iboe_get_rate(ndev);
     dev_put(ndev);
     route->path_rec->packet_life_time_selector = IB_SA_EQ;
     /* In case ACK timeout is set, use this value to calculate
      * PacketLifeTime.  As per IBTA 12.7.34,
      * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
      * Assuming a negligible local ACK delay, we can use
      * PacketLifeTime = local ACK timeout/2
      * as a reasonable approximation for RoCE networks.
      */
     mutex_lock(&id_priv->qp_mutex);
     if (id_priv->timeout_set && id_priv->timeout)
         route->path_rec->packet_life_time = id_priv->timeout - 1;
     else
         route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
     mutex_unlock(&id_priv->qp_mutex);
 
     if (!route->path_rec->mtu) {
         ret = -EINVAL;
         goto err2;
     }
 
     if (rdma_protocol_roce_udp_encap(id_priv->id.device,
                      id_priv->id.port_num))
         route->path_rec->flow_label =
             cma_get_roce_udp_flow_label(id_priv);
 
     cma_init_resolve_route_work(work, id_priv);
     queue_work(cma_wq, &work->work);
 
     return 0;
 
 err2:
     kfree(route->path_rec);
     route->path_rec = NULL;
     route->num_paths = 0;
 err1:
     kfree(work);
     return ret;
 }
 
 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
 {
     struct rdma_id_private *id_priv;
     int ret;
 
     if (!timeout_ms)
         return -EINVAL;
 
     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;
 
     cma_id_get(id_priv);
     if (rdma_cap_ib_sa(id->device, id->port_num))
         ret = cma_resolve_ib_route(id_priv, timeout_ms);
     else if (rdma_protocol_roce(id->device, id->port_num)) {
         ret = cma_resolve_iboe_route(id_priv);
         if (!ret)
             cma_add_id_to_tree(id_priv);
     }
     else if (rdma_protocol_iwarp(id->device, id->port_num))
         ret = cma_resolve_iw_route(id_priv);
     else
         ret = -ENOSYS;
 
     if (ret)
         goto err;
 
     return 0;
 err:
     cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
     cma_id_put(id_priv);
     return ret;
 }
 EXPORT_SYMBOL(rdma_resolve_route);
 
 static void cma_set_loopback(struct sockaddr *addr)
 {
     switch (addr->sa_family) {
     case AF_INET:
         ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
         break;
     case AF_INET6:
         ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
                   0, 0, 0, htonl(1));
         break;
     default:
         ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
                 0, 0, 0, htonl(1));
         break;
     }
 }
 
 static int cma_bind_loopback(struct rdma_id_private *id_priv)
 {
     struct cma_device *cma_dev, *cur_dev;
     union ib_gid gid;
     enum ib_port_state port_state;
     unsigned int p;
     u16 pkey;
     int ret;
 
     cma_dev = NULL;
     mutex_lock(&lock);
     list_for_each_entry(cur_dev, &dev_list, list) {
         if (cma_family(id_priv) == AF_IB &&
             !rdma_cap_ib_cm(cur_dev->device, 1))
             continue;
 
         if (!cma_dev)
             cma_dev = cur_dev;
 
         rdma_for_each_port (cur_dev->device, p) {
             if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
                 port_state == IB_PORT_ACTIVE) {
                 cma_dev = cur_dev;
                 goto port_found;
             }
         }
     }
 
     if (!cma_dev) {
         ret = -ENODEV;
         goto out;
     }
 
     p = 1;
 
 port_found:
     ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
     if (ret)
         goto out;
 
     ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
     if (ret)
         goto out;
 
     id_priv->id.route.addr.dev_addr.dev_type =
         (rdma_protocol_ib(cma_dev->device, p)) ?
         ARPHRD_INFINIBAND : ARPHRD_ETHER;
 
     rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
     ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
     id_priv->id.port_num = p;
     cma_attach_to_dev(id_priv, cma_dev);
     rdma_restrack_add(&id_priv->res);
     cma_set_loopback(cma_src_addr(id_priv));
 out:
     mutex_unlock(&lock);
     return ret;
 }
 
 static void addr_handler(int status, struct sockaddr *src_addr,
              struct rdma_dev_addr *dev_addr, void *context)
 {
     struct rdma_id_private *id_priv = context;
     struct rdma_cm_event event = {};
     struct sockaddr *addr;
     struct sockaddr_storage old_addr;
 
     mutex_lock(&id_priv->handler_mutex);
     if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
                RDMA_CM_ADDR_RESOLVED))
         goto out;
 
     /*
      * Store the previous src address, so that if we fail to acquire
      * matching rdma device, old address can be restored back, which helps
      * to cancel the cma listen operation correctly.
      */
     addr = cma_src_addr(id_priv);
     memcpy(&old_addr, addr, rdma_addr_size(addr));
     memcpy(addr, src_addr, rdma_addr_size(src_addr));
     if (!status && !id_priv->cma_dev) {
         status = cma_acquire_dev_by_src_ip(id_priv);
         if (status)
             pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
                          status);
         rdma_restrack_add(&id_priv->res);
     } else if (status) {
         pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
     }
 
     if (status) {
         memcpy(addr, &old_addr,
                rdma_addr_size((struct sockaddr *)&old_addr));
         if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
                    RDMA_CM_ADDR_BOUND))
             goto out;
         event.event = RDMA_CM_EVENT_ADDR_ERROR;
         event.status = status;
     } else
         event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
 
     if (cma_cm_event_handler(id_priv, &event)) {
         destroy_id_handler_unlock(id_priv);
         return;
     }
 out:
     mutex_unlock(&id_priv->handler_mutex);
 }
 
 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
 {
     struct cma_work *work;
     union ib_gid gid;
     int ret;
 
     work = kzalloc(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);
 
     enqueue_resolve_addr_work(work, id_priv);
     return 0;
 err:
     kfree(work);
     return ret;
 }
 
 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
 {
     struct cma_work *work;
     int ret;
 
     work = kzalloc(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));
 
     enqueue_resolve_addr_work(work, id_priv);
     return 0;
 err:
     kfree(work);
     return ret;
 }
 
 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
              const struct sockaddr *dst_addr)
 {
     struct sockaddr_storage zero_sock = {};
 
     if (src_addr && src_addr->sa_family)
         return rdma_bind_addr(id, src_addr);
 
     /*
      * When the src_addr is not specified, automatically supply an any addr
      */
     zero_sock.ss_family = dst_addr->sa_family;
     if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
         struct sockaddr_in6 *src_addr6 =
             (struct sockaddr_in6 *)&zero_sock;
         struct sockaddr_in6 *dst_addr6 =
             (struct sockaddr_in6 *)dst_addr;
 
         src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
         if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
             id->route.addr.dev_addr.bound_dev_if =
                 dst_addr6->sin6_scope_id;
     } else if (dst_addr->sa_family == AF_IB) {
         ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
             ((struct sockaddr_ib *)dst_addr)->sib_pkey;
     }
     return rdma_bind_addr(id, (struct sockaddr *)&zero_sock);
 }
 
 /*
  * If required, resolve the source address for bind and leave the id_priv in
  * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
  * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
  * ignored.
  */
 static int resolve_prepare_src(struct rdma_id_private *id_priv,
                    struct sockaddr *src_addr,
                    const struct sockaddr *dst_addr)
 {
     int ret;
 
     memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
     if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
         /* For a well behaved ULP state will be RDMA_CM_IDLE */
         ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
         if (ret)
             goto err_dst;
         if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
                        RDMA_CM_ADDR_QUERY))) {
             ret = -EINVAL;
             goto err_dst;
         }
     }
 
     if (cma_family(id_priv) != dst_addr->sa_family) {
         ret = -EINVAL;
         goto err_state;
     }
     return 0;
 
 err_state:
     cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
 err_dst:
     memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
     return ret;
 }
 
 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
               const struct sockaddr *dst_addr, unsigned long timeout_ms)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     int ret;
 
     ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
     if (ret)
         return ret;
 
     if (cma_any_addr(dst_addr)) {
         ret = cma_resolve_loopback(id_priv);
     } else {
         if (dst_addr->sa_family == AF_IB) {
             ret = cma_resolve_ib_addr(id_priv);
         } else {
             /*
              * The FSM can return back to RDMA_CM_ADDR_BOUND after
              * rdma_resolve_ip() is called, eg through the error
              * path in addr_handler(). If this happens the existing
              * request must be canceled before issuing a new one.
              * Since canceling a request is a bit slow and this
              * oddball path is rare, keep track once a request has
              * been issued. The track turns out to be a permanent
              * state since this is the only cancel as it is
              * immediately before rdma_resolve_ip().
              */
             if (id_priv->used_resolve_ip)
                 rdma_addr_cancel(&id->route.addr.dev_addr);
             else
                 id_priv->used_resolve_ip = 1;
             ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
                           &id->route.addr.dev_addr,
                           timeout_ms, addr_handler,
                           false, id_priv);
         }
     }
     if (ret)
         goto err;
 
     return 0;
 err:
     cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
     return ret;
 }
 EXPORT_SYMBOL(rdma_resolve_addr);
 
 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
 {
     struct rdma_id_private *id_priv;
     unsigned long flags;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     spin_lock_irqsave(&id_priv->lock, flags);
     if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
         id_priv->state == RDMA_CM_IDLE) {
         id_priv->reuseaddr = reuse;
         ret = 0;
     } else {
         ret = -EINVAL;
     }
     spin_unlock_irqrestore(&id_priv->lock, flags);
     return ret;
 }
 EXPORT_SYMBOL(rdma_set_reuseaddr);
 
 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
 {
     struct rdma_id_private *id_priv;
     unsigned long flags;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     spin_lock_irqsave(&id_priv->lock, flags);
     if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
         id_priv->options |= (1 << CMA_OPTION_AFONLY);
         id_priv->afonly = afonly;
         ret = 0;
     } else {
         ret = -EINVAL;
     }
     spin_unlock_irqrestore(&id_priv->lock, flags);
     return ret;
 }
 EXPORT_SYMBOL(rdma_set_afonly);
 
 static void cma_bind_port(struct rdma_bind_list *bind_list,
               struct rdma_id_private *id_priv)
 {
     struct sockaddr *addr;
     struct sockaddr_ib *sib;
     u64 sid, mask;
     __be16 port;
 
     lockdep_assert_held(&lock);
 
     addr = cma_src_addr(id_priv);
     port = htons(bind_list->port);
 
     switch (addr->sa_family) {
     case AF_INET:
         ((struct sockaddr_in *) addr)->sin_port = port;
         break;
     case AF_INET6:
         ((struct sockaddr_in6 *) addr)->sin6_port = port;
         break;
     case AF_IB:
         sib = (struct sockaddr_ib *) addr;
         sid = be64_to_cpu(sib->sib_sid);
         mask = be64_to_cpu(sib->sib_sid_mask);
         sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
         sib->sib_sid_mask = cpu_to_be64(~0ULL);
         break;
     }
     id_priv->bind_list = bind_list;
     hlist_add_head(&id_priv->node, &bind_list->owners);
 }
 
 static int cma_alloc_port(enum rdma_ucm_port_space ps,
               struct rdma_id_private *id_priv, unsigned short snum)
 {
     struct rdma_bind_list *bind_list;
     int ret;
 
     lockdep_assert_held(&lock);
 
     bind_list = kzalloc(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 = snum;
     cma_bind_port(bind_list, id_priv);
     return 0;
 err:
     kfree(bind_list);
     return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
 }
 
 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
                   struct rdma_id_private *id_priv)
 {
     struct rdma_id_private *cur_id;
     struct sockaddr  *daddr = cma_dst_addr(id_priv);
     struct sockaddr  *saddr = cma_src_addr(id_priv);
     __be16 dport = cma_port(daddr);
 
     lockdep_assert_held(&lock);
 
     hlist_for_each_entry(cur_id, &bind_list->owners, node) {
         struct sockaddr  *cur_daddr = cma_dst_addr(cur_id);
         struct sockaddr  *cur_saddr = cma_src_addr(cur_id);
         __be16 cur_dport = cma_port(cur_daddr);
 
         if (id_priv == cur_id)
             continue;
 
         /* different dest port -> unique */
         if (!cma_any_port(daddr) &&
             !cma_any_port(cur_daddr) &&
             (dport != cur_dport))
             continue;
 
         /* different src address -> unique */
         if (!cma_any_addr(saddr) &&
             !cma_any_addr(cur_saddr) &&
             cma_addr_cmp(saddr, cur_saddr))
             continue;
 
         /* different dst address -> unique */
         if (!cma_any_addr(daddr) &&
             !cma_any_addr(cur_daddr) &&
             cma_addr_cmp(daddr, cur_daddr))
             continue;
 
         return -EADDRNOTAVAIL;
     }
     return 0;
 }
 
 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
                   struct rdma_id_private *id_priv)
 {
     static unsigned int last_used_port;
     int low, high, remaining;
     unsigned int rover;
     struct net *net = id_priv->id.route.addr.dev_addr.net;
 
     lockdep_assert_held(&lock);
 
     inet_get_local_port_range(net, &low, &high);
     remaining = (high - low) + 1;
     rover = 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;
 
     lockdep_assert_held(&lock);
 
     addr = cma_src_addr(id_priv);
     hlist_for_each_entry(cur_id, &bind_list->owners, node) {
         if (id_priv == cur_id)
             continue;
 
         if (reuseaddr && cur_id->reuseaddr)
             continue;
 
         cur_addr = cma_src_addr(cur_id);
         if (id_priv->afonly && cur_id->afonly &&
             (addr->sa_family != cur_addr->sa_family))
             continue;
 
         if (cma_any_addr(addr) || cma_any_addr(cur_addr))
             return -EADDRNOTAVAIL;
 
         if (!cma_addr_cmp(addr, cur_addr))
             return -EADDRINUSE;
     }
     return 0;
 }
 
 static int cma_use_port(enum rdma_ucm_port_space ps,
             struct rdma_id_private *id_priv)
 {
     struct rdma_bind_list *bind_list;
     unsigned short snum;
     int ret;
 
     lockdep_assert_held(&lock);
 
     snum = ntohs(cma_port(cma_src_addr(id_priv)));
     if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
         return -EACCES;
 
     bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
     if (!bind_list) {
         ret = cma_alloc_port(ps, id_priv, snum);
     } else {
         ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
         if (!ret)
             cma_bind_port(bind_list, id_priv);
     }
     return ret;
 }
 
 static enum rdma_ucm_port_space
 cma_select_inet_ps(struct rdma_id_private *id_priv)
 {
     switch (id_priv->id.ps) {
     case RDMA_PS_TCP:
     case RDMA_PS_UDP:
     case RDMA_PS_IPOIB:
     case RDMA_PS_IB:
         return id_priv->id.ps;
     default:
 
         return 0;
     }
 }
 
 static enum rdma_ucm_port_space
 cma_select_ib_ps(struct rdma_id_private *id_priv)
 {
     enum rdma_ucm_port_space ps = 0;
     struct sockaddr_ib *sib;
     u64 sid_ps, mask, sid;
 
     sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
     mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
     sid = be64_to_cpu(sib->sib_sid) & mask;
 
     if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
         sid_ps = RDMA_IB_IP_PS_IB;
         ps = RDMA_PS_IB;
     } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
            (sid == (RDMA_IB_IP_PS_TCP & mask))) {
         sid_ps = RDMA_IB_IP_PS_TCP;
         ps = RDMA_PS_TCP;
     } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
            (sid == (RDMA_IB_IP_PS_UDP & mask))) {
         sid_ps = RDMA_IB_IP_PS_UDP;
         ps = RDMA_PS_UDP;
     }
 
     if (ps) {
         sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
         sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
                         be64_to_cpu(sib->sib_sid_mask));
     }
     return ps;
 }
 
 static int cma_get_port(struct rdma_id_private *id_priv)
 {
     enum rdma_ucm_port_space ps;
     int ret;
 
     if (cma_family(id_priv) != AF_IB)
         ps = cma_select_inet_ps(id_priv);
     else
         ps = cma_select_ib_ps(id_priv);
     if (!ps)
         return -EPROTONOSUPPORT;
 
     mutex_lock(&lock);
     if (cma_any_port(cma_src_addr(id_priv)))
         ret = cma_alloc_any_port(ps, id_priv);
     else
         ret = cma_use_port(ps, id_priv);
     mutex_unlock(&lock);
 
     return ret;
 }
 
 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
                    struct sockaddr *addr)
 {
 #if IS_ENABLED(CONFIG_IPV6)
     struct sockaddr_in6 *sin6;
 
     if (addr->sa_family != AF_INET6)
         return 0;
 
     sin6 = (struct sockaddr_in6 *) addr;
 
     if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
         return 0;
 
     if (!sin6->sin6_scope_id)
             return -EINVAL;
 
     dev_addr->bound_dev_if = sin6->sin6_scope_id;
 #endif
     return 0;
 }
 
 int rdma_listen(struct rdma_cm_id *id, int backlog)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     int ret;
 
     if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
         struct sockaddr_in any_in = {
             .sin_family = AF_INET,
             .sin_addr.s_addr = htonl(INADDR_ANY),
         };
 
         /* For a well behaved ULP state will be RDMA_CM_IDLE */
         ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
         if (ret)
             return ret;
         if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
                        RDMA_CM_LISTEN)))
             return -EINVAL;
     }
 
     /*
      * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
      * any more, and has to be unique in the bind list.
      */
     if (id_priv->reuseaddr) {
         mutex_lock(&lock);
         ret = cma_check_port(id_priv->bind_list, id_priv, 0);
         if (!ret)
             id_priv->reuseaddr = 0;
         mutex_unlock(&lock);
         if (ret)
             goto err;
     }
 
     id_priv->backlog = backlog;
     if (id_priv->cma_dev) {
         if (rdma_cap_ib_cm(id->device, 1)) {
             ret = cma_ib_listen(id_priv);
             if (ret)
                 goto err;
         } else if (rdma_cap_iw_cm(id->device, 1)) {
             ret = cma_iw_listen(id_priv, backlog);
             if (ret)
                 goto err;
         } else {
             ret = -ENOSYS;
             goto err;
         }
     } else {
         ret = cma_listen_on_all(id_priv);
         if (ret)
             goto err;
     }
 
     return 0;
 err:
     id_priv->backlog = 0;
     /*
      * All the failure paths that lead here will not allow the req_handler's
      * to have run.
      */
     cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
     return ret;
 }
 EXPORT_SYMBOL(rdma_listen);
 
 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_by_src_ip(id_priv);
         if (ret)
             goto err1;
     }
 
     if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
         if (addr->sa_family == AF_INET)
             id_priv->afonly = 1;
 #if IS_ENABLED(CONFIG_IPV6)
         else if (addr->sa_family == AF_INET6) {
             struct net *net = id_priv->id.route.addr.dev_addr.net;
 
             id_priv->afonly = net->ipv6.sysctl.bindv6only;
         }
 #endif
     }
     daddr = cma_dst_addr(id_priv);
     daddr->sa_family = addr->sa_family;
 
     ret = cma_get_port(id_priv);
     if (ret)
         goto err2;
 
     if (!cma_any_addr(addr))
         rdma_restrack_add(&id_priv->res);
     return 0;
 err2:
     if (id_priv->cma_dev)
         cma_release_dev(id_priv);
 err1:
     cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
     return ret;
 }
 EXPORT_SYMBOL(rdma_bind_addr);
 
 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
 {
     struct cma_hdr *cma_hdr;
 
     cma_hdr = hdr;
     cma_hdr->cma_version = CMA_VERSION;
     if (cma_family(id_priv) == AF_INET) {
         struct sockaddr_in *src4, *dst4;
 
         src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
         dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
 
         cma_set_ip_ver(cma_hdr, 4);
         cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
         cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
         cma_hdr->port = src4->sin_port;
     } else if (cma_family(id_priv) == AF_INET6) {
         struct sockaddr_in6 *src6, *dst6;
 
         src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
         dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
 
         cma_set_ip_ver(cma_hdr, 6);
         cma_hdr->src_addr.ip6 = src6->sin6_addr;
         cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
         cma_hdr->port = src6->sin6_port;
     }
     return 0;
 }
 
 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
                 const struct ib_cm_event *ib_event)
 {
     struct rdma_id_private *id_priv = cm_id->context;
     struct rdma_cm_event event = {};
     const struct ib_cm_sidr_rep_event_param *rep =
                 &ib_event->param.sidr_rep_rcvd;
     int ret;
 
     mutex_lock(&id_priv->handler_mutex);
     if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
         goto out;
 
     switch (ib_event->event) {
     case IB_CM_SIDR_REQ_ERROR:
         event.event = RDMA_CM_EVENT_UNREACHABLE;
         event.status = -ETIMEDOUT;
         break;
     case IB_CM_SIDR_REP_RECEIVED:
         event.param.ud.private_data = ib_event->private_data;
         event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
         if (rep->status != IB_SIDR_SUCCESS) {
             event.event = RDMA_CM_EVENT_UNREACHABLE;
             event.status = ib_event->param.sidr_rep_rcvd.status;
             pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
                          event.status);
             break;
         }
         ret = cma_set_qkey(id_priv, rep->qkey);
         if (ret) {
             pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
             event.event = RDMA_CM_EVENT_ADDR_ERROR;
             event.status = ret;
             break;
         }
         ib_init_ah_attr_from_path(id_priv->id.device,
                       id_priv->id.port_num,
                       id_priv->id.route.path_rec,
                       &event.param.ud.ah_attr,
                       rep->sgid_attr);
         event.param.ud.qp_num = rep->qpn;
         event.param.ud.qkey = rep->qkey;
         event.event = RDMA_CM_EVENT_ESTABLISHED;
         event.status = 0;
         break;
     default:
         pr_err("RDMA CMA: unexpected IB CM event: %d\n",
                ib_event->event);
         goto out;
     }
 
     ret = cma_cm_event_handler(id_priv, &event);
 
     rdma_destroy_ah_attr(&event.param.ud.ah_attr);
     if (ret) {
         /* Destroy the CM ID by returning a non-zero value. */
         id_priv->cm_id.ib = NULL;
         destroy_id_handler_unlock(id_priv);
         return ret;
     }
 out:
     mutex_unlock(&id_priv->handler_mutex);
     return 0;
 }
 
 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
                   struct rdma_conn_param *conn_param)
 {
     struct ib_cm_sidr_req_param req;
     struct ib_cm_id *id;
     void *private_data;
     u8 offset;
     int ret;
 
     memset(&req, 0, sizeof req);
     offset = cma_user_data_offset(id_priv);
     if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
         return -EINVAL;
 
     if (req.private_data_len) {
         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
         if (!private_data)
             return -ENOMEM;
     } else {
         private_data = NULL;
     }
 
     if (conn_param->private_data && conn_param->private_data_len)
         memcpy(private_data + offset, conn_param->private_data,
                conn_param->private_data_len);
 
     if (private_data) {
         ret = cma_format_hdr(private_data, id_priv);
         if (ret)
             goto out;
         req.private_data = private_data;
     }
 
     id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
                  id_priv);
     if (IS_ERR(id)) {
         ret = PTR_ERR(id);
         goto out;
     }
     id_priv->cm_id.ib = id;
 
     req.path = id_priv->id.route.path_rec;
     req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
     req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
     req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
     req.max_cm_retries = CMA_MAX_CM_RETRIES;
 
     trace_cm_send_sidr_req(id_priv);
     ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
     if (ret) {
         ib_destroy_cm_id(id_priv->cm_id.ib);
         id_priv->cm_id.ib = NULL;
     }
 out:
     kfree(private_data);
     return ret;
 }
 
 static int cma_connect_ib(struct rdma_id_private *id_priv,
               struct rdma_conn_param *conn_param)
 {
     struct ib_cm_req_param req;
     struct rdma_route *route;
     void *private_data;
     struct ib_cm_id *id;
     u8 offset;
     int ret;
 
     memset(&req, 0, sizeof req);
     offset = cma_user_data_offset(id_priv);
     if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
         return -EINVAL;
 
     if (req.private_data_len) {
         private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
         if (!private_data)
             return -ENOMEM;
     } else {
         private_data = NULL;
     }
 
     if (conn_param->private_data && conn_param->private_data_len)
         memcpy(private_data + offset, conn_param->private_data,
                conn_param->private_data_len);
 
     id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
     if (IS_ERR(id)) {
         ret = PTR_ERR(id);
         goto out;
     }
     id_priv->cm_id.ib = id;
 
     route = &id_priv->id.route;
     if (private_data) {
         ret = cma_format_hdr(private_data, id_priv);
         if (ret)
             goto out;
         req.private_data = private_data;
     }
 
     req.primary_path = &route->path_rec[0];
     if (route->num_paths == 2)
         req.alternate_path = &route->path_rec[1];
 
     req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
     /* Alternate path SGID attribute currently unsupported */
     req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
     req.qp_num = id_priv->qp_num;
     req.qp_type = id_priv->id.qp_type;
     req.starting_psn = id_priv->seq_num;
     req.responder_resources = conn_param->responder_resources;
     req.initiator_depth = conn_param->initiator_depth;
     req.flow_control = conn_param->flow_control;
     req.retry_count = min_t(u8, 7, conn_param->retry_count);
     req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
     req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
     req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
     req.max_cm_retries = CMA_MAX_CM_RETRIES;
     req.srq = id_priv->srq ? 1 : 0;
     req.ece.vendor_id = id_priv->ece.vendor_id;
     req.ece.attr_mod = id_priv->ece.attr_mod;
 
     trace_cm_send_req(id_priv);
     ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
 out:
     if (ret && !IS_ERR(id)) {
         ib_destroy_cm_id(id);
         id_priv->cm_id.ib = NULL;
     }
 
     kfree(private_data);
     return ret;
 }
 
 static int cma_connect_iw(struct rdma_id_private *id_priv,
               struct rdma_conn_param *conn_param)
 {
     struct iw_cm_id *cm_id;
     int ret;
     struct iw_cm_conn_param iw_param;
 
     cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
     if (IS_ERR(cm_id))
         return PTR_ERR(cm_id);
 
     mutex_lock(&id_priv->qp_mutex);
     cm_id->tos = id_priv->tos;
     cm_id->tos_set = id_priv->tos_set;
     mutex_unlock(&id_priv->qp_mutex);
 
     id_priv->cm_id.iw = cm_id;
 
     memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
            rdma_addr_size(cma_src_addr(id_priv)));
     memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
            rdma_addr_size(cma_dst_addr(id_priv)));
 
     ret = cma_modify_qp_rtr(id_priv, conn_param);
     if (ret)
         goto out;
 
     if (conn_param) {
         iw_param.ord = conn_param->initiator_depth;
         iw_param.ird = conn_param->responder_resources;
         iw_param.private_data = conn_param->private_data;
         iw_param.private_data_len = conn_param->private_data_len;
         iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
     } else {
         memset(&iw_param, 0, sizeof iw_param);
         iw_param.qpn = id_priv->qp_num;
     }
     ret = iw_cm_connect(cm_id, &iw_param);
 out:
     if (ret) {
         iw_destroy_cm_id(cm_id);
         id_priv->cm_id.iw = NULL;
     }
     return ret;
 }
 
 /**
  * rdma_connect_locked - Initiate an active connection request.
  * @id: Connection identifier to connect.
  * @conn_param: Connection information used for connected QPs.
  *
  * Same as rdma_connect() but can only be called from the
  * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
  */
 int rdma_connect_locked(struct rdma_cm_id *id,
             struct rdma_conn_param *conn_param)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     int ret;
 
     if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
         return -EINVAL;
 
     if (!id->qp) {
         id_priv->qp_num = conn_param->qp_num;
         id_priv->srq = conn_param->srq;
     }
 
     if (rdma_cap_ib_cm(id->device, id->port_num)) {
         if (id->qp_type == IB_QPT_UD)
             ret = cma_resolve_ib_udp(id_priv, conn_param);
         else
             ret = cma_connect_ib(id_priv, conn_param);
     } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
         ret = cma_connect_iw(id_priv, conn_param);
     } else {
         ret = -ENOSYS;
     }
     if (ret)
         goto err_state;
     return 0;
 err_state:
     cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
     return ret;
 }
 EXPORT_SYMBOL(rdma_connect_locked);
 
 /**
  * rdma_connect - Initiate an active connection request.
  * @id: Connection identifier to connect.
  * @conn_param: Connection information used for connected QPs.
  *
  * Users must have resolved a route for the rdma_cm_id to connect with by having
  * called rdma_resolve_route before calling this routine.
  *
  * This call will either connect to a remote QP or obtain remote QP information
  * for unconnected rdma_cm_id's.  The actual operation is based on the
  * rdma_cm_id's port space.
  */
 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     int ret;
 
     mutex_lock(&id_priv->handler_mutex);
     ret = rdma_connect_locked(id, conn_param);
     mutex_unlock(&id_priv->handler_mutex);
     return ret;
 }
 EXPORT_SYMBOL(rdma_connect);
 
 /**
  * rdma_connect_ece - Initiate an active connection request with ECE data.
  * @id: Connection identifier to connect.
  * @conn_param: Connection information used for connected QPs.
  * @ece: ECE parameters
  *
  * See rdma_connect() explanation.
  */
 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
              struct rdma_ucm_ece *ece)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
 
     id_priv->ece.vendor_id = ece->vendor_id;
     id_priv->ece.attr_mod = ece->attr_mod;
 
     return rdma_connect(id, conn_param);
 }
 EXPORT_SYMBOL(rdma_connect_ece);
 
 static int cma_accept_ib(struct rdma_id_private *id_priv,
              struct rdma_conn_param *conn_param)
 {
     struct ib_cm_rep_param rep;
     int ret;
 
     ret = cma_modify_qp_rtr(id_priv, conn_param);
     if (ret)
         goto out;
 
     ret = cma_modify_qp_rts(id_priv, conn_param);
     if (ret)
         goto out;
 
     memset(&rep, 0, sizeof rep);
     rep.qp_num = id_priv->qp_num;
     rep.starting_psn = id_priv->seq_num;
     rep.private_data = conn_param->private_data;
     rep.private_data_len = conn_param->private_data_len;
     rep.responder_resources = conn_param->responder_resources;
     rep.initiator_depth = conn_param->initiator_depth;
     rep.failover_accepted = 0;
     rep.flow_control = conn_param->flow_control;
     rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
     rep.srq = id_priv->srq ? 1 : 0;
     rep.ece.vendor_id = id_priv->ece.vendor_id;
     rep.ece.attr_mod = id_priv->ece.attr_mod;
 
     trace_cm_send_rep(id_priv);
     ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
 out:
     return ret;
 }
 
 static int cma_accept_iw(struct rdma_id_private *id_priv,
           struct rdma_conn_param *conn_param)
 {
     struct iw_cm_conn_param iw_param;
     int ret;
 
     if (!conn_param)
         return -EINVAL;
 
     ret = cma_modify_qp_rtr(id_priv, conn_param);
     if (ret)
         return ret;
 
     iw_param.ord = conn_param->initiator_depth;
     iw_param.ird = conn_param->responder_resources;
     iw_param.private_data = conn_param->private_data;
     iw_param.private_data_len = conn_param->private_data_len;
     if (id_priv->id.qp)
         iw_param.qpn = id_priv->qp_num;
     else
         iw_param.qpn = conn_param->qp_num;
 
     return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
 }
 
 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
                  enum ib_cm_sidr_status status, u32 qkey,
                  const void *private_data, int private_data_len)
 {
     struct ib_cm_sidr_rep_param rep;
     int ret;
 
     memset(&rep, 0, sizeof rep);
     rep.status = status;
     if (status == IB_SIDR_SUCCESS) {
         ret = cma_set_qkey(id_priv, qkey);
         if (ret)
             return ret;
         rep.qp_num = id_priv->qp_num;
         rep.qkey = id_priv->qkey;
 
         rep.ece.vendor_id = id_priv->ece.vendor_id;
         rep.ece.attr_mod = id_priv->ece.attr_mod;
     }
 
     rep.private_data = private_data;
     rep.private_data_len = private_data_len;
 
     trace_cm_send_sidr_rep(id_priv);
     return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
 }
 
 /**
  * rdma_accept - Called to accept a connection request or response.
  * @id: Connection identifier associated with the request.
  * @conn_param: Information needed to establish the connection.  This must be
  *   provided if accepting a connection request.  If accepting a connection
  *   response, this parameter must be NULL.
  *
  * Typically, this routine is only called by the listener to accept a connection
  * request.  It must also be called on the active side of a connection if the
  * user is performing their own QP transitions.
  *
  * In the case of error, a reject message is sent to the remote side and the
  * state of the qp associated with the id is modified to error, such that any
  * previously posted receive buffers would be flushed.
  *
  * This function is for use by kernel ULPs and must be called from under the
  * handler callback.
  */
 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     int ret;
 
     lockdep_assert_held(&id_priv->handler_mutex);
 
     if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
         return -EINVAL;
 
     if (!id->qp && conn_param) {
         id_priv->qp_num = conn_param->qp_num;
         id_priv->srq = conn_param->srq;
     }
 
     if (rdma_cap_ib_cm(id->device, id->port_num)) {
         if (id->qp_type == IB_QPT_UD) {
             if (conn_param)
                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
                             conn_param->qkey,
                             conn_param->private_data,
                             conn_param->private_data_len);
             else
                 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
                             0, NULL, 0);
         } else {
             if (conn_param)
                 ret = cma_accept_ib(id_priv, conn_param);
             else
                 ret = cma_rep_recv(id_priv);
         }
     } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
         ret = cma_accept_iw(id_priv, conn_param);
     } else {
         ret = -ENOSYS;
     }
     if (ret)
         goto reject;
 
     return 0;
 reject:
     cma_modify_qp_err(id_priv);
     rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
     return ret;
 }
 EXPORT_SYMBOL(rdma_accept);
 
 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
             struct rdma_ucm_ece *ece)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
 
     id_priv->ece.vendor_id = ece->vendor_id;
     id_priv->ece.attr_mod = ece->attr_mod;
 
     return rdma_accept(id, conn_param);
 }
 EXPORT_SYMBOL(rdma_accept_ece);
 
 void rdma_lock_handler(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
 
     mutex_lock(&id_priv->handler_mutex);
 }
 EXPORT_SYMBOL(rdma_lock_handler);
 
 void rdma_unlock_handler(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
 
     mutex_unlock(&id_priv->handler_mutex);
 }
 EXPORT_SYMBOL(rdma_unlock_handler);
 
 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
 {
     struct rdma_id_private *id_priv;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (!id_priv->cm_id.ib)
         return -EINVAL;
 
     switch (id->device->node_type) {
     case RDMA_NODE_IB_CA:
         ret = ib_cm_notify(id_priv->cm_id.ib, event);
         break;
     default:
         ret = 0;
         break;
     }
     return ret;
 }
 EXPORT_SYMBOL(rdma_notify);
 
 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
         u8 private_data_len, u8 reason)
 {
     struct rdma_id_private *id_priv;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (!id_priv->cm_id.ib)
         return -EINVAL;
 
     if (rdma_cap_ib_cm(id->device, id->port_num)) {
         if (id->qp_type == IB_QPT_UD) {
             ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
                         private_data, private_data_len);
         } else {
             trace_cm_send_rej(id_priv);
             ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
                          private_data, private_data_len);
         }
     } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
         ret = iw_cm_reject(id_priv->cm_id.iw,
                    private_data, private_data_len);
     } else {
         ret = -ENOSYS;
     }
 
     return ret;
 }
 EXPORT_SYMBOL(rdma_reject);
 
 int rdma_disconnect(struct rdma_cm_id *id)
 {
     struct rdma_id_private *id_priv;
     int ret;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     if (!id_priv->cm_id.ib)
         return -EINVAL;
 
     if (rdma_cap_ib_cm(id->device, id->port_num)) {
         ret = cma_modify_qp_err(id_priv);
         if (ret)
             goto out;
         /* Initiate or respond to a disconnect. */
         trace_cm_disconnect(id_priv);
         if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
             if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
                 trace_cm_sent_drep(id_priv);
         } else {
             trace_cm_sent_dreq(id_priv);
         }
     } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
         ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
     } else
         ret = -EINVAL;
 
 out:
     return ret;
 }
 EXPORT_SYMBOL(rdma_disconnect);
 
 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
                   struct ib_sa_multicast *multicast,
                   struct rdma_cm_event *event,
                   struct cma_multicast *mc)
 {
     struct rdma_dev_addr *dev_addr;
     enum ib_gid_type gid_type;
     struct net_device *ndev;
 
     if (!status)
         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);
 
     event->status = status;
     event->param.ud.private_data = mc->context;
     if (status) {
         event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
         return;
     }
 
     dev_addr = &id_priv->id.route.addr.dev_addr;
     ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
     gid_type =
         id_priv->cma_dev
             ->default_gid_type[id_priv->id.port_num -
                        rdma_start_port(
                            id_priv->cma_dev->device)];
 
     event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
     if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
                      &multicast->rec, ndev, gid_type,
                      &event->param.ud.ah_attr)) {
         event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
         goto out;
     }
 
     event->param.ud.qp_num = 0xFFFFFF;
     event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
 
 out:
     if (ndev)
         dev_put(ndev);
 }
 
 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
 {
     struct cma_multicast *mc = multicast->context;
     struct rdma_id_private *id_priv = mc->id_priv;
     struct rdma_cm_event event = {};
     int ret = 0;
 
     mutex_lock(&id_priv->handler_mutex);
     if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
         READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
         goto out;
 
     cma_make_mc_event(status, id_priv, multicast, &event, mc);
     ret = cma_cm_event_handler(id_priv, &event);
     rdma_destroy_ah_attr(&event.param.ud.ah_attr);
     WARN_ON(ret);
 
 out:
     mutex_unlock(&id_priv->handler_mutex);
     return 0;
 }
 
 static void cma_set_mgid(struct rdma_id_private *id_priv,
              struct sockaddr *addr, union ib_gid *mgid)
 {
     unsigned char mc_map[MAX_ADDR_LEN];
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     struct sockaddr_in *sin = (struct sockaddr_in *) addr;
     struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
 
     if (cma_any_addr(addr)) {
         memset(mgid, 0, sizeof *mgid);
     } else if ((addr->sa_family == AF_INET6) &&
            ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
                                  0xFF10A01B)) {
         /* IPv6 address is an SA assigned MGID. */
         memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
     } else if (addr->sa_family == AF_IB) {
         memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
     } else if (addr->sa_family == AF_INET6) {
         ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
         if (id_priv->id.ps == RDMA_PS_UDP)
             mc_map[7] = 0x01;   /* Use RDMA CM signature */
         *mgid = *(union ib_gid *) (mc_map + 4);
     } else {
         ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
         if (id_priv->id.ps == RDMA_PS_UDP)
             mc_map[7] = 0x01;   /* Use RDMA CM signature */
         *mgid = *(union ib_gid *) (mc_map + 4);
     }
 }
 
 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
                  struct cma_multicast *mc)
 {
     struct ib_sa_mcmember_rec rec;
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     ib_sa_comp_mask comp_mask;
     int ret;
 
     ib_addr_get_mgid(dev_addr, &rec.mgid);
     ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
                      &rec.mgid, &rec);
     if (ret)
         return ret;
 
     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;
 
     comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
             IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
             IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
             IB_SA_MCMEMBER_REC_FLOW_LABEL |
             IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 
     if (id_priv->id.ps == RDMA_PS_IPOIB)
         comp_mask |= IB_SA_MCMEMBER_REC_RATE |
                  IB_SA_MCMEMBER_REC_RATE_SELECTOR |
                  IB_SA_MCMEMBER_REC_MTU_SELECTOR |
                  IB_SA_MCMEMBER_REC_MTU |
                  IB_SA_MCMEMBER_REC_HOP_LIMIT;
 
     mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
                      id_priv->id.port_num, &rec, comp_mask,
                      GFP_KERNEL, cma_ib_mc_handler, mc);
     return PTR_ERR_OR_ZERO(mc->sa_mc);
 }
 
 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
                   enum ib_gid_type gid_type)
 {
     struct sockaddr_in *sin = (struct sockaddr_in *)addr;
     struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
 
     if (cma_any_addr(addr)) {
         memset(mgid, 0, sizeof *mgid);
     } else if (addr->sa_family == AF_INET6) {
         memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
     } else {
         mgid->raw[0] =
             (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
         mgid->raw[1] =
             (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
         mgid->raw[2] = 0;
         mgid->raw[3] = 0;
         mgid->raw[4] = 0;
         mgid->raw[5] = 0;
         mgid->raw[6] = 0;
         mgid->raw[7] = 0;
         mgid->raw[8] = 0;
         mgid->raw[9] = 0;
         mgid->raw[10] = 0xff;
         mgid->raw[11] = 0xff;
         *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
     }
 }
 
 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
                    struct cma_multicast *mc)
 {
     struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
     int err = 0;
     struct sockaddr *addr = (struct sockaddr *)&mc->addr;
     struct net_device *ndev = NULL;
     struct ib_sa_multicast ib;
     enum ib_gid_type gid_type;
     bool send_only;
 
     send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
 
     if (cma_zero_addr(addr))
         return -EINVAL;
 
     gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
            rdma_start_port(id_priv->cma_dev->device)];
     cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
 
     ib.rec.pkey = cpu_to_be16(0xffff);
     if (id_priv->id.ps == RDMA_PS_UDP)
         ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
 
     if (dev_addr->bound_dev_if)
         ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
     if (!ndev)
         return -ENODEV;
 
     ib.rec.rate = iboe_get_rate(ndev);
     ib.rec.hop_limit = 1;
     ib.rec.mtu = iboe_get_mtu(ndev->mtu);
 
     if (addr->sa_family == AF_INET) {
         if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
             ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
             if (!send_only) {
                 err = cma_igmp_send(ndev, &ib.rec.mgid,
                             true);
             }
         }
     } else {
         if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
             err = -ENOTSUPP;
     }
     dev_put(ndev);
     if (err || !ib.rec.mtu)
         return err ?: -EINVAL;
 
     rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
             &ib.rec.port_gid);
     INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
     cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
     queue_work(cma_wq, &mc->iboe_join.work);
     return 0;
 }
 
 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
             u8 join_state, void *context)
 {
     struct rdma_id_private *id_priv =
         container_of(id, struct rdma_id_private, id);
     struct cma_multicast *mc;
     int ret;
 
     /* Not supported for kernel QPs */
     if (WARN_ON(id->qp))
         return -EINVAL;
 
     /* ULP is calling this wrong. */
     if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
                 READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
         return -EINVAL;
 
     mc = kzalloc(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->join_state = join_state;
 
     if (rdma_protocol_roce(id->device, id->port_num)) {
         ret = cma_iboe_join_multicast(id_priv, mc);
         if (ret)
             goto out_err;
     } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
         ret = cma_join_ib_multicast(id_priv, mc);
         if (ret)
             goto out_err;
     } else {
         ret = -ENOSYS;
         goto out_err;
     }
 
     spin_lock(&id_priv->lock);
     list_add(&mc->list, &id_priv->mc_list);
     spin_unlock(&id_priv->lock);
 
     return 0;
 out_err:
     kfree(mc);
     return ret;
 }
 EXPORT_SYMBOL(rdma_join_multicast);
 
 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
 {
     struct rdma_id_private *id_priv;
     struct cma_multicast *mc;
 
     id_priv = container_of(id, struct rdma_id_private, id);
     spin_lock_irq(&id_priv->lock);
     list_for_each_entry(mc, &id_priv->mc_list, list) {
         if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
             continue;
         list_del(&mc->list);
         spin_unlock_irq(&id_priv->lock);
 
         WARN_ON(id_priv->cma_dev->device != id->device);
         destroy_mc(id_priv, mc);
         return;
     }
     spin_unlock_irq(&id_priv->lock);
 }
 EXPORT_SYMBOL(rdma_leave_multicast);
 
 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
 {
     struct rdma_dev_addr *dev_addr;
     struct cma_work *work;
 
     dev_addr = &id_priv->id.route.addr.dev_addr;
 
     if ((dev_addr->bound_dev_if == ndev->ifindex) &&
         (net_eq(dev_net(ndev), dev_addr->net)) &&
         memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
         pr_info("RDMA CM addr change for ndev %s used by id %p\n",
             ndev->name, &id_priv->id);
         work = kzalloc(sizeof *work, GFP_KERNEL);
         if (!work)
             return -ENOMEM;
 
         INIT_WORK(&work->work, cma_work_handler);
         work->id = id_priv;
         work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
         cma_id_get(id_priv);
         queue_work(cma_wq, &work->work);
     }
 
     return 0;
 }
 
 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
                    void *ptr)
 {
     struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
     struct cma_device *cma_dev;
     struct rdma_id_private *id_priv;
     int ret = NOTIFY_DONE;
 
     if (event != NETDEV_BONDING_FAILOVER)
         return NOTIFY_DONE;
 
     if (!netif_is_bond_master(ndev))
         return NOTIFY_DONE;
 
     mutex_lock(&lock);
     list_for_each_entry(cma_dev, &dev_list, list)
         list_for_each_entry(id_priv, &cma_dev->id_list, device_item) {
             ret = cma_netdev_change(ndev, id_priv);
             if (ret)
                 goto out;
         }
 
 out:
     mutex_unlock(&lock);
     return ret;
 }
 
 static void cma_netevent_work_handler(struct work_struct *_work)
 {
     struct rdma_id_private *id_priv =
         container_of(_work, struct rdma_id_private, id.net_work);
     struct rdma_cm_event event = {};
 
     mutex_lock(&id_priv->handler_mutex);
 
     if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
         READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
         goto out_unlock;
 
     event.event = RDMA_CM_EVENT_UNREACHABLE;
     event.status = -ETIMEDOUT;
 
     if (cma_cm_event_handler(id_priv, &event)) {
         __acquire(&id_priv->handler_mutex);
         id_priv->cm_id.ib = NULL;
         cma_id_put(id_priv);
         destroy_id_handler_unlock(id_priv);
         return;
     }
 
 out_unlock:
     mutex_unlock(&id_priv->handler_mutex);
     cma_id_put(id_priv);
 }
 
 static int cma_netevent_callback(struct notifier_block *self,
                  unsigned long event, void *ctx)
 {
     struct id_table_entry *ips_node = NULL;
     struct rdma_id_private *current_id;
     struct neighbour *neigh = ctx;
     unsigned long flags;
 
     if (event != NETEVENT_NEIGH_UPDATE)
         return NOTIFY_DONE;
 
     spin_lock_irqsave(&id_table_lock, flags);
     if (neigh->tbl->family == AF_INET6) {
         struct sockaddr_in6 neigh_sock_6;
 
         neigh_sock_6.sin6_family = AF_INET6;
         neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key;
         ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
                          (struct sockaddr *)&neigh_sock_6);
     } else if (neigh->tbl->family == AF_INET) {
         struct sockaddr_in neigh_sock_4;
 
         neigh_sock_4.sin_family = AF_INET;
         neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key);
         ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
                          (struct sockaddr *)&neigh_sock_4);
     } else
         goto out;
 
     if (!ips_node)
         goto out;
 
     list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
         if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
                neigh->ha, ETH_ALEN))
             continue;
         INIT_WORK(&current_id->id.net_work, cma_netevent_work_handler);
         cma_id_get(current_id);
         queue_work(cma_wq, &current_id->id.net_work);
     }
 out:
     spin_unlock_irqrestore(&id_table_lock, flags);
     return NOTIFY_DONE;
 }
 
 static struct notifier_block cma_nb = {
     .notifier_call = cma_netdev_callback
 };
 
 static struct notifier_block cma_netevent_cb = {
     .notifier_call = cma_netevent_callback
 };
 
 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
 {
     struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
     enum rdma_cm_state state;
     unsigned long flags;
 
     mutex_lock(&id_priv->handler_mutex);
     /* Record that we want to remove the device */
     spin_lock_irqsave(&id_priv->lock, flags);
     state = id_priv->state;
     if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
         spin_unlock_irqrestore(&id_priv->lock, flags);
         mutex_unlock(&id_priv->handler_mutex);
         cma_id_put(id_priv);
         return;
     }
     id_priv->state = RDMA_CM_DEVICE_REMOVAL;
     spin_unlock_irqrestore(&id_priv->lock, flags);
 
     if (cma_cm_event_handler(id_priv, &event)) {
         /*
          * At this point the ULP promises it won't call
          * rdma_destroy_id() concurrently
          */
         cma_id_put(id_priv);
         mutex_unlock(&id_priv->handler_mutex);
         trace_cm_id_destroy(id_priv);
         _destroy_id(id_priv, state);
         return;
     }
     mutex_unlock(&id_priv->handler_mutex);
 
     /*
      * If this races with destroy then the thread that first assigns state
      * to a destroying does the cancel.
      */
     cma_cancel_operation(id_priv, state);
     cma_id_put(id_priv);
 }
 
 static void cma_process_remove(struct cma_device *cma_dev)
 {
     mutex_lock(&lock);
     while (!list_empty(&cma_dev->id_list)) {
         struct rdma_id_private *id_priv = list_first_entry(
             &cma_dev->id_list, struct rdma_id_private, device_item);
 
         list_del_init(&id_priv->listen_item);
         list_del_init(&id_priv->device_item);
         cma_id_get(id_priv);
         mutex_unlock(&lock);
 
         cma_send_device_removal_put(id_priv);
 
         mutex_lock(&lock);
     }
     mutex_unlock(&lock);
 
     cma_dev_put(cma_dev);
     wait_for_completion(&cma_dev->comp);
 }
 
 static bool cma_supported(struct ib_device *device)
 {
     u32 i;
 
     rdma_for_each_port(device, i) {
         if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
             return true;
     }
     return false;
 }
 
 static int cma_add_one(struct ib_device *device)
 {
     struct rdma_id_private *to_destroy;
     struct cma_device *cma_dev;
     struct rdma_id_private *id_priv;
     unsigned long supported_gids = 0;
     int ret;
     u32 i;
 
     if (!cma_supported(device))
         return -EOPNOTSUPP;
 
     cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
     if (!cma_dev)
         return -ENOMEM;
 
     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) {
         ret = -ENOMEM;
         goto free_cma_dev;
     }
 
     cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
                         sizeof(*cma_dev->default_roce_tos),
                         GFP_KERNEL);
     if (!cma_dev->default_roce_tos) {
         ret = -ENOMEM;
         goto free_gid_type;
     }
 
     rdma_for_each_port (device, i) {
         supported_gids = roce_gid_type_mask_support(device, i);
         WARN_ON(!supported_gids);
         if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
             cma_dev->default_gid_type[i - rdma_start_port(device)] =
                 CMA_PREFERRED_ROCE_GID_TYPE;
         else
             cma_dev->default_gid_type[i - rdma_start_port(device)] =
                 find_first_bit(&supported_gids, BITS_PER_LONG);
         cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
     }
 
     init_completion(&cma_dev->comp);
     refcount_set(&cma_dev->refcount, 1);
     INIT_LIST_HEAD(&cma_dev->id_list);
     ib_set_client_data(device, &cma_client, cma_dev);
 
     mutex_lock(&lock);
     list_add_tail(&cma_dev->list, &dev_list);
     list_for_each_entry(id_priv, &listen_any_list, listen_any_item) {
         ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
         if (ret)
             goto free_listen;
     }
     mutex_unlock(&lock);
 
     trace_cm_add_one(device);
     return 0;
 
 free_listen:
     list_del(&cma_dev->list);
     mutex_unlock(&lock);
 
     /* cma_process_remove() will delete to_destroy */
     cma_process_remove(cma_dev);
     kfree(cma_dev->default_roce_tos);
 free_gid_type:
     kfree(cma_dev->default_gid_type);
 
 free_cma_dev:
     kfree(cma_dev);
     return ret;
 }
 
 static void cma_remove_one(struct ib_device *device, void *client_data)
 {
     struct cma_device *cma_dev = client_data;
 
     trace_cm_remove_one(device);
 
     mutex_lock(&lock);
     list_del(&cma_dev->list);
     mutex_unlock(&lock);
 
     cma_process_remove(cma_dev);
     kfree(cma_dev->default_roce_tos);
     kfree(cma_dev->default_gid_type);
     kfree(cma_dev);
 }
 
 static int cma_init_net(struct net *net)
 {
     struct cma_pernet *pernet = cma_pernet(net);
 
     xa_init(&pernet->tcp_ps);
     xa_init(&pernet->udp_ps);
     xa_init(&pernet->ipoib_ps);
     xa_init(&pernet->ib_ps);
 
     return 0;
 }
 
 static void cma_exit_net(struct net *net)
 {
     struct cma_pernet *pernet = cma_pernet(net);
 
     WARN_ON(!xa_empty(&pernet->tcp_ps));
     WARN_ON(!xa_empty(&pernet->udp_ps));
     WARN_ON(!xa_empty(&pernet->ipoib_ps));
     WARN_ON(!xa_empty(&pernet->ib_ps));
 }
 
 static struct pernet_operations cma_pernet_operations = {
     .init = cma_init_net,
     .exit = cma_exit_net,
     .id = &cma_pernet_id,
     .size = sizeof(struct cma_pernet),
 };
 
 static int __init cma_init(void)
 {
     int ret;
 
     /*
      * There is a rare lock ordering dependency in cma_netdev_callback()
      * that only happens when bonding is enabled. Teach lockdep that rtnl
      * must never be nested under lock so it can find these without having
      * to test with bonding.
      */
     if (IS_ENABLED(CONFIG_LOCKDEP)) {
         rtnl_lock();
         mutex_lock(&lock);
         mutex_unlock(&lock);
         rtnl_unlock();
     }
 
     cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
     if (!cma_wq)
         return -ENOMEM;
 
     ret = register_pernet_subsys(&cma_pernet_operations);
     if (ret)
         goto err_wq;
 
     ib_sa_register_client(&sa_client);
     register_netdevice_notifier(&cma_nb);
     register_netevent_notifier(&cma_netevent_cb);
 
     ret = ib_register_client(&cma_client);
     if (ret)
         goto err;
 
     ret = cma_configfs_init();
     if (ret)
         goto err_ib;
 
     return 0;
 
 err_ib:
     ib_unregister_client(&cma_client);
 err:
     unregister_netevent_notifier(&cma_netevent_cb);
     unregister_netdevice_notifier(&cma_nb);
     ib_sa_unregister_client(&sa_client);
     unregister_pernet_subsys(&cma_pernet_operations);
 err_wq:
     destroy_workqueue(cma_wq);
     return ret;
 }
 
 static void __exit cma_cleanup(void)
 {
     cma_configfs_exit();
     ib_unregister_client(&cma_client);
     unregister_netevent_notifier(&cma_netevent_cb);
     unregister_netdevice_notifier(&cma_nb);
     ib_sa_unregister_client(&sa_client);
     unregister_pernet_subsys(&cma_pernet_operations);
     destroy_workqueue(cma_wq);
 }
 
 module_init(cma_init);
 module_exit(cma_cleanup);