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multicast.c

/*
 * Copyright (c) 2006 Intel Corporation.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/completion.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/random.h>

#include <rdma/ib_cache.h>
#include "sa.h"

static void mcast_add_one(struct ib_device *device);
static void mcast_remove_one(struct ib_device *device);

static struct ib_client mcast_client = {
      .name   = "ib_multicast",
      .add    = mcast_add_one,
      .remove = mcast_remove_one
};

static struct ib_sa_client    sa_client;
static struct workqueue_struct      *mcast_wq;
static union ib_gid mgid0;

struct mcast_device;

struct mcast_port {
      struct mcast_device     *dev;
      spinlock_t        lock;
      struct rb_root          table;
      atomic_t          refcount;
      struct completion comp;
      u8                port_num;
};

struct mcast_device {
      struct ib_device  *device;
      struct ib_event_handler event_handler;
      int               start_port;
      int               end_port;
      struct mcast_port port[0];
};

enum mcast_state {
      MCAST_IDLE,
      MCAST_JOINING,
      MCAST_MEMBER,
      MCAST_BUSY,
      MCAST_ERROR
};

struct mcast_member;

struct mcast_group {
      struct ib_sa_mcmember_rec rec;
      struct rb_node          node;
      struct mcast_port *port;
      spinlock_t        lock;
      struct work_struct      work;
      struct list_head  pending_list;
      struct list_head  active_list;
      struct mcast_member     *last_join;
      int               members[3];
      atomic_t          refcount;
      enum mcast_state  state;
      struct ib_sa_query      *query;
      int               query_id;
};

struct mcast_member {
      struct ib_sa_multicast  multicast;
      struct ib_sa_client     *client;
      struct mcast_group      *group;
      struct list_head  list;
      enum mcast_state  state;
      atomic_t          refcount;
      struct completion comp;
};

static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
                   void *context);
static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
                    void *context);

static struct mcast_group *mcast_find(struct mcast_port *port,
                              union ib_gid *mgid)
{
      struct rb_node *node = port->table.rb_node;
      struct mcast_group *group;
      int ret;

      while (node) {
            group = rb_entry(node, struct mcast_group, node);
            ret = memcmp(mgid->raw, group->rec.mgid.raw, sizeof *mgid);
            if (!ret)
                  return group;

            if (ret < 0)
                  node = node->rb_left;
            else
                  node = node->rb_right;
      }
      return NULL;
}

static struct mcast_group *mcast_insert(struct mcast_port *port,
                              struct mcast_group *group,
                              int allow_duplicates)
{
      struct rb_node **link = &port->table.rb_node;
      struct rb_node *parent = NULL;
      struct mcast_group *cur_group;
      int ret;

      while (*link) {
            parent = *link;
            cur_group = rb_entry(parent, struct mcast_group, node);

            ret = memcmp(group->rec.mgid.raw, cur_group->rec.mgid.raw,
                       sizeof group->rec.mgid);
            if (ret < 0)
                  link = &(*link)->rb_left;
            else if (ret > 0)
                  link = &(*link)->rb_right;
            else if (allow_duplicates)
                  link = &(*link)->rb_left;
            else
                  return cur_group;
      }
      rb_link_node(&group->node, parent, link);
      rb_insert_color(&group->node, &port->table);
      return NULL;
}

static void deref_port(struct mcast_port *port)
{
      if (atomic_dec_and_test(&port->refcount))
            complete(&port->comp);
}

static void release_group(struct mcast_group *group)
{
      struct mcast_port *port = group->port;
      unsigned long flags;

      spin_lock_irqsave(&port->lock, flags);
      if (atomic_dec_and_test(&group->refcount)) {
            rb_erase(&group->node, &port->table);
            spin_unlock_irqrestore(&port->lock, flags);
            kfree(group);
            deref_port(port);
      } else
            spin_unlock_irqrestore(&port->lock, flags);
}

static void deref_member(struct mcast_member *member)
{
      if (atomic_dec_and_test(&member->refcount))
            complete(&member->comp);
}

static void queue_join(struct mcast_member *member)
{
      struct mcast_group *group = member->group;
      unsigned long flags;

      spin_lock_irqsave(&group->lock, flags);
      list_add_tail(&member->list, &group->pending_list);
      if (group->state == MCAST_IDLE) {
            group->state = MCAST_BUSY;
            atomic_inc(&group->refcount);
            queue_work(mcast_wq, &group->work);
      }
      spin_unlock_irqrestore(&group->lock, flags);
}

/*
 * A multicast group has three types of members: full member, non member, and
 * send only member.  We need to keep track of the number of members of each
 * type based on their join state.  Adjust the number of members the belong to
 * the specified join states.
 */
static void adjust_membership(struct mcast_group *group, u8 join_state, int inc)
{
      int i;

      for (i = 0; i < 3; i++, join_state >>= 1)
            if (join_state & 0x1)
                  group->members[i] += inc;
}

/*
 * If a multicast group has zero members left for a particular join state, but
 * the group is still a member with the SA, we need to leave that join state.
 * Determine which join states we still belong to, but that do not have any
 * active members.
 */
static u8 get_leave_state(struct mcast_group *group)
{
      u8 leave_state = 0;
      int i;

      for (i = 0; i < 3; i++)
            if (!group->members[i])
                  leave_state |= (0x1 << i);

      return leave_state & group->rec.join_state;
}

static int check_selector(ib_sa_comp_mask comp_mask,
                    ib_sa_comp_mask selector_mask,
                    ib_sa_comp_mask value_mask,
                    u8 selector, u8 src_value, u8 dst_value)
{
      int err;

      if (!(comp_mask & selector_mask) || !(comp_mask & value_mask))
            return 0;

      switch (selector) {
      case IB_SA_GT:
            err = (src_value <= dst_value);
            break;
      case IB_SA_LT:
            err = (src_value >= dst_value);
            break;
      case IB_SA_EQ:
            err = (src_value != dst_value);
            break;
      default:
            err = 0;
            break;
      }

      return err;
}

static int cmp_rec(struct ib_sa_mcmember_rec *src,
               struct ib_sa_mcmember_rec *dst, ib_sa_comp_mask comp_mask)
{
      /* MGID must already match */

      if (comp_mask & IB_SA_MCMEMBER_REC_PORT_GID &&
          memcmp(&src->port_gid, &dst->port_gid, sizeof src->port_gid))
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_QKEY && src->qkey != dst->qkey)
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_MLID && src->mlid != dst->mlid)
            return -EINVAL;
      if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_MTU_SELECTOR,
                     IB_SA_MCMEMBER_REC_MTU, dst->mtu_selector,
                     src->mtu, dst->mtu))
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_TRAFFIC_CLASS &&
          src->traffic_class != dst->traffic_class)
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_PKEY && src->pkey != dst->pkey)
            return -EINVAL;
      if (check_selector(comp_mask, IB_SA_MCMEMBER_REC_RATE_SELECTOR,
                     IB_SA_MCMEMBER_REC_RATE, dst->rate_selector,
                     src->rate, dst->rate))
            return -EINVAL;
      if (check_selector(comp_mask,
                     IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME_SELECTOR,
                     IB_SA_MCMEMBER_REC_PACKET_LIFE_TIME,
                     dst->packet_life_time_selector,
                     src->packet_life_time, dst->packet_life_time))
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_SL && src->sl != dst->sl)
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_FLOW_LABEL &&
          src->flow_label != dst->flow_label)
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_HOP_LIMIT &&
          src->hop_limit != dst->hop_limit)
            return -EINVAL;
      if (comp_mask & IB_SA_MCMEMBER_REC_SCOPE && src->scope != dst->scope)
            return -EINVAL;

      /* join_state checked separately, proxy_join ignored */

      return 0;
}

static int send_join(struct mcast_group *group, struct mcast_member *member)
{
      struct mcast_port *port = group->port;
      int ret;

      group->last_join = member;
      ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
                               port->port_num, IB_MGMT_METHOD_SET,
                               &member->multicast.rec,
                               member->multicast.comp_mask,
                               3000, GFP_KERNEL, join_handler, group,
                               &group->query);
      if (ret >= 0) {
            group->query_id = ret;
            ret = 0;
      }
      return ret;
}

static int send_leave(struct mcast_group *group, u8 leave_state)
{
      struct mcast_port *port = group->port;
      struct ib_sa_mcmember_rec rec;
      int ret;

      rec = group->rec;
      rec.join_state = leave_state;

      ret = ib_sa_mcmember_rec_query(&sa_client, port->dev->device,
                               port->port_num, IB_SA_METHOD_DELETE, &rec,
                               IB_SA_MCMEMBER_REC_MGID     |
                               IB_SA_MCMEMBER_REC_PORT_GID |
                               IB_SA_MCMEMBER_REC_JOIN_STATE,
                               3000, GFP_KERNEL, leave_handler,
                               group, &group->query);
      if (ret >= 0) {
            group->query_id = ret;
            ret = 0;
      }
      return ret;
}

static void join_group(struct mcast_group *group, struct mcast_member *member,
                   u8 join_state)
{
      member->state = MCAST_MEMBER;
      adjust_membership(group, join_state, 1);
      group->rec.join_state |= join_state;
      member->multicast.rec = group->rec;
      member->multicast.rec.join_state = join_state;
      list_move(&member->list, &group->active_list);
}

static int fail_join(struct mcast_group *group, struct mcast_member *member,
                 int status)
{
      spin_lock_irq(&group->lock);
      list_del_init(&member->list);
      spin_unlock_irq(&group->lock);
      return member->multicast.callback(status, &member->multicast);
}

static void process_group_error(struct mcast_group *group)
{
      struct mcast_member *member;
      int ret;

      spin_lock_irq(&group->lock);
      while (!list_empty(&group->active_list)) {
            member = list_entry(group->active_list.next,
                            struct mcast_member, list);
            atomic_inc(&member->refcount);
            list_del_init(&member->list);
            adjust_membership(group, member->multicast.rec.join_state, -1);
            member->state = MCAST_ERROR;
            spin_unlock_irq(&group->lock);

            ret = member->multicast.callback(-ENETRESET,
                                     &member->multicast);
            deref_member(member);
            if (ret)
                  ib_sa_free_multicast(&member->multicast);
            spin_lock_irq(&group->lock);
      }

      group->rec.join_state = 0;
      group->state = MCAST_BUSY;
      spin_unlock_irq(&group->lock);
}

static void mcast_work_handler(struct work_struct *work)
{
      struct mcast_group *group;
      struct mcast_member *member;
      struct ib_sa_multicast *multicast;
      int status, ret;
      u8 join_state;

      group = container_of(work, typeof(*group), work);
retest:
      spin_lock_irq(&group->lock);
      while (!list_empty(&group->pending_list) ||
             (group->state == MCAST_ERROR)) {

            if (group->state == MCAST_ERROR) {
                  spin_unlock_irq(&group->lock);
                  process_group_error(group);
                  goto retest;
            }

            member = list_entry(group->pending_list.next,
                            struct mcast_member, list);
            multicast = &member->multicast;
            join_state = multicast->rec.join_state;
            atomic_inc(&member->refcount);

            if (join_state == (group->rec.join_state & join_state)) {
                  status = cmp_rec(&group->rec, &multicast->rec,
                               multicast->comp_mask);
                  if (!status)
                        join_group(group, member, join_state);
                  else
                        list_del_init(&member->list);
                  spin_unlock_irq(&group->lock);
                  ret = multicast->callback(status, multicast);
            } else {
                  spin_unlock_irq(&group->lock);
                  status = send_join(group, member);
                  if (!status) {
                        deref_member(member);
                        return;
                  }
                  ret = fail_join(group, member, status);
            }

            deref_member(member);
            if (ret)
                  ib_sa_free_multicast(&member->multicast);
            spin_lock_irq(&group->lock);
      }

      join_state = get_leave_state(group);
      if (join_state) {
            group->rec.join_state &= ~join_state;
            spin_unlock_irq(&group->lock);
            if (send_leave(group, join_state))
                  goto retest;
      } else {
            group->state = MCAST_IDLE;
            spin_unlock_irq(&group->lock);
            release_group(group);
      }
}

/*
 * Fail a join request if it is still active - at the head of the pending queue.
 */
static void process_join_error(struct mcast_group *group, int status)
{
      struct mcast_member *member;
      int ret;

      spin_lock_irq(&group->lock);
      member = list_entry(group->pending_list.next,
                      struct mcast_member, list);
      if (group->last_join == member) {
            atomic_inc(&member->refcount);
            list_del_init(&member->list);
            spin_unlock_irq(&group->lock);
            ret = member->multicast.callback(status, &member->multicast);
            deref_member(member);
            if (ret)
                  ib_sa_free_multicast(&member->multicast);
      } else
            spin_unlock_irq(&group->lock);
}

static void join_handler(int status, struct ib_sa_mcmember_rec *rec,
                   void *context)
{
      struct mcast_group *group = context;

      if (status)
            process_join_error(group, status);
      else {
            spin_lock_irq(&group->port->lock);
            group->rec = *rec;
            if (!memcmp(&mgid0, &group->rec.mgid, sizeof mgid0)) {
                  rb_erase(&group->node, &group->port->table);
                  mcast_insert(group->port, group, 1);
            }
            spin_unlock_irq(&group->port->lock);
      }
      mcast_work_handler(&group->work);
}

static void leave_handler(int status, struct ib_sa_mcmember_rec *rec,
                    void *context)
{
      struct mcast_group *group = context;

      mcast_work_handler(&group->work);
}

static struct mcast_group *acquire_group(struct mcast_port *port,
                               union ib_gid *mgid, gfp_t gfp_mask)
{
      struct mcast_group *group, *cur_group;
      unsigned long flags;
      int is_mgid0;

      is_mgid0 = !memcmp(&mgid0, mgid, sizeof mgid0);
      if (!is_mgid0) {
            spin_lock_irqsave(&port->lock, flags);
            group = mcast_find(port, mgid);
            if (group)
                  goto found;
            spin_unlock_irqrestore(&port->lock, flags);
      }

      group = kzalloc(sizeof *group, gfp_mask);
      if (!group)
            return NULL;

      group->port = port;
      group->rec.mgid = *mgid;
      INIT_LIST_HEAD(&group->pending_list);
      INIT_LIST_HEAD(&group->active_list);
      INIT_WORK(&group->work, mcast_work_handler);
      spin_lock_init(&group->lock);

      spin_lock_irqsave(&port->lock, flags);
      cur_group = mcast_insert(port, group, is_mgid0);
      if (cur_group) {
            kfree(group);
            group = cur_group;
      } else
            atomic_inc(&port->refcount);
found:
      atomic_inc(&group->refcount);
      spin_unlock_irqrestore(&port->lock, flags);
      return group;
}

/*
 * We serialize all join requests to a single group to make our lives much
 * easier.  Otherwise, two users could try to join the same group
 * simultaneously, with different configurations, one could leave while the
 * join is in progress, etc., which makes locking around error recovery
 * difficult.
 */
struct ib_sa_multicast *
ib_sa_join_multicast(struct ib_sa_client *client,
                 struct ib_device *device, u8 port_num,
                 struct ib_sa_mcmember_rec *rec,
                 ib_sa_comp_mask comp_mask, gfp_t gfp_mask,
                 int (*callback)(int status,
                             struct ib_sa_multicast *multicast),
                 void *context)
{
      struct mcast_device *dev;
      struct mcast_member *member;
      struct ib_sa_multicast *multicast;
      int ret;

      dev = ib_get_client_data(device, &mcast_client);
      if (!dev)
            return ERR_PTR(-ENODEV);

      member = kmalloc(sizeof *member, gfp_mask);
      if (!member)
            return ERR_PTR(-ENOMEM);

      ib_sa_client_get(client);
      member->client = client;
      member->multicast.rec = *rec;
      member->multicast.comp_mask = comp_mask;
      member->multicast.callback = callback;
      member->multicast.context = context;
      init_completion(&member->comp);
      atomic_set(&member->refcount, 1);
      member->state = MCAST_JOINING;

      member->group = acquire_group(&dev->port[port_num - dev->start_port],
                              &rec->mgid, gfp_mask);
      if (!member->group) {
            ret = -ENOMEM;
            goto err;
      }

      /*
       * The user will get the multicast structure in their callback.  They
       * could then free the multicast structure before we can return from
       * this routine.  So we save the pointer to return before queuing
       * any callback.
       */
      multicast = &member->multicast;
      queue_join(member);
      return multicast;

err:
      ib_sa_client_put(client);
      kfree(member);
      return ERR_PTR(ret);
}
EXPORT_SYMBOL(ib_sa_join_multicast);

void ib_sa_free_multicast(struct ib_sa_multicast *multicast)
{
      struct mcast_member *member;
      struct mcast_group *group;

      member = container_of(multicast, struct mcast_member, multicast);
      group = member->group;

      spin_lock_irq(&group->lock);
      if (member->state == MCAST_MEMBER)
            adjust_membership(group, multicast->rec.join_state, -1);

      list_del_init(&member->list);

      if (group->state == MCAST_IDLE) {
            group->state = MCAST_BUSY;
            spin_unlock_irq(&group->lock);
            /* Continue to hold reference on group until callback */
            queue_work(mcast_wq, &group->work);
      } else {
            spin_unlock_irq(&group->lock);
            release_group(group);
      }

      deref_member(member);
      wait_for_completion(&member->comp);
      ib_sa_client_put(member->client);
      kfree(member);
}
EXPORT_SYMBOL(ib_sa_free_multicast);

int ib_sa_get_mcmember_rec(struct ib_device *device, u8 port_num,
                     union ib_gid *mgid, struct ib_sa_mcmember_rec *rec)
{
      struct mcast_device *dev;
      struct mcast_port *port;
      struct mcast_group *group;
      unsigned long flags;
      int ret = 0;

      dev = ib_get_client_data(device, &mcast_client);
      if (!dev)
            return -ENODEV;

      port = &dev->port[port_num - dev->start_port];
      spin_lock_irqsave(&port->lock, flags);
      group = mcast_find(port, mgid);
      if (group)
            *rec = group->rec;
      else
            ret = -EADDRNOTAVAIL;
      spin_unlock_irqrestore(&port->lock, flags);

      return ret;
}
EXPORT_SYMBOL(ib_sa_get_mcmember_rec);

int ib_init_ah_from_mcmember(struct ib_device *device, u8 port_num,
                       struct ib_sa_mcmember_rec *rec,
                       struct ib_ah_attr *ah_attr)
{
      int ret;
      u16 gid_index;
      u8 p;

      ret = ib_find_cached_gid(device, &rec->port_gid, &p, &gid_index);
      if (ret)
            return ret;

      memset(ah_attr, 0, sizeof *ah_attr);
      ah_attr->dlid = be16_to_cpu(rec->mlid);
      ah_attr->sl = rec->sl;
      ah_attr->port_num = port_num;
      ah_attr->static_rate = rec->rate;

      ah_attr->ah_flags = IB_AH_GRH;
      ah_attr->grh.dgid = rec->mgid;

      ah_attr->grh.sgid_index = (u8) gid_index;
      ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
      ah_attr->grh.hop_limit = rec->hop_limit;
      ah_attr->grh.traffic_class = rec->traffic_class;

      return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_mcmember);

static void mcast_groups_lost(struct mcast_port *port)
{
      struct mcast_group *group;
      struct rb_node *node;
      unsigned long flags;

      spin_lock_irqsave(&port->lock, flags);
      for (node = rb_first(&port->table); node; node = rb_next(node)) {
            group = rb_entry(node, struct mcast_group, node);
            spin_lock(&group->lock);
            if (group->state == MCAST_IDLE) {
                  atomic_inc(&group->refcount);
                  queue_work(mcast_wq, &group->work);
            }
            group->state = MCAST_ERROR;
            spin_unlock(&group->lock);
      }
      spin_unlock_irqrestore(&port->lock, flags);
}

static void mcast_event_handler(struct ib_event_handler *handler,
                        struct ib_event *event)
{
      struct mcast_device *dev;

      dev = container_of(handler, struct mcast_device, event_handler);

      switch (event->event) {
      case IB_EVENT_PORT_ERR:
      case IB_EVENT_LID_CHANGE:
      case IB_EVENT_SM_CHANGE:
      case IB_EVENT_CLIENT_REREGISTER:
            mcast_groups_lost(&dev->port[event->element.port_num -
                                   dev->start_port]);
            break;
      default:
            break;
      }
}

static void mcast_add_one(struct ib_device *device)
{
      struct mcast_device *dev;
      struct mcast_port *port;
      int i;

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

      dev = kmalloc(sizeof *dev + device->phys_port_cnt * sizeof *port,
                  GFP_KERNEL);
      if (!dev)
            return;

      if (device->node_type == RDMA_NODE_IB_SWITCH)
            dev->start_port = dev->end_port = 0;
      else {
            dev->start_port = 1;
            dev->end_port = device->phys_port_cnt;
      }

      for (i = 0; i <= dev->end_port - dev->start_port; i++) {
            port = &dev->port[i];
            port->dev = dev;
            port->port_num = dev->start_port + i;
            spin_lock_init(&port->lock);
            port->table = RB_ROOT;
            init_completion(&port->comp);
            atomic_set(&port->refcount, 1);
      }

      dev->device = device;
      ib_set_client_data(device, &mcast_client, dev);

      INIT_IB_EVENT_HANDLER(&dev->event_handler, device, mcast_event_handler);
      ib_register_event_handler(&dev->event_handler);
}

static void mcast_remove_one(struct ib_device *device)
{
      struct mcast_device *dev;
      struct mcast_port *port;
      int i;

      dev = ib_get_client_data(device, &mcast_client);
      if (!dev)
            return;

      ib_unregister_event_handler(&dev->event_handler);
      flush_workqueue(mcast_wq);

      for (i = 0; i <= dev->end_port - dev->start_port; i++) {
            port = &dev->port[i];
            deref_port(port);
            wait_for_completion(&port->comp);
      }

      kfree(dev);
}

int mcast_init(void)
{
      int ret;

      mcast_wq = create_singlethread_workqueue("ib_mcast");
      if (!mcast_wq)
            return -ENOMEM;

      ib_sa_register_client(&sa_client);

      ret = ib_register_client(&mcast_client);
      if (ret)
            goto err;
      return 0;

err:
      ib_sa_unregister_client(&sa_client);
      destroy_workqueue(mcast_wq);
      return ret;
}

void mcast_cleanup(void)
{
      ib_unregister_client(&mcast_client);
      ib_sa_unregister_client(&sa_client);
      destroy_workqueue(mcast_wq);
}

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