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-rw-r--r--drivers/infiniband/hw/mlx4/cm.c604
1 files changed, 604 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/cm.c b/drivers/infiniband/hw/mlx4/cm.c
new file mode 100644
index 0000000000..12b481d138
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/cm.c
@@ -0,0 +1,604 @@
+/*
+ * Copyright (c) 2012 Mellanox Technologies. 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 <rdma/ib_mad.h>
+
+#include <linux/mlx4/cmd.h>
+#include <linux/rbtree.h>
+#include <linux/idr.h>
+#include <rdma/ib_cm.h>
+
+#include "mlx4_ib.h"
+
+#define CM_CLEANUP_CACHE_TIMEOUT (30 * HZ)
+
+struct id_map_entry {
+ struct rb_node node;
+
+ u32 sl_cm_id;
+ u32 pv_cm_id;
+ int slave_id;
+ int scheduled_delete;
+ struct mlx4_ib_dev *dev;
+
+ struct list_head list;
+ struct delayed_work timeout;
+};
+
+struct rej_tmout_entry {
+ int slave;
+ u32 rem_pv_cm_id;
+ struct delayed_work timeout;
+ struct xarray *xa_rej_tmout;
+};
+
+struct cm_generic_msg {
+ struct ib_mad_hdr hdr;
+
+ __be32 local_comm_id;
+ __be32 remote_comm_id;
+ unsigned char unused[2];
+ __be16 rej_reason;
+};
+
+struct cm_sidr_generic_msg {
+ struct ib_mad_hdr hdr;
+ __be32 request_id;
+};
+
+struct cm_req_msg {
+ unsigned char unused[0x60];
+ union ib_gid primary_path_sgid;
+};
+
+static struct workqueue_struct *cm_wq;
+
+static void set_local_comm_id(struct ib_mad *mad, u32 cm_id)
+{
+ if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
+ struct cm_sidr_generic_msg *msg =
+ (struct cm_sidr_generic_msg *)mad;
+ msg->request_id = cpu_to_be32(cm_id);
+ } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
+ pr_err("trying to set local_comm_id in SIDR_REP\n");
+ return;
+ } else {
+ struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
+ msg->local_comm_id = cpu_to_be32(cm_id);
+ }
+}
+
+static u32 get_local_comm_id(struct ib_mad *mad)
+{
+ if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
+ struct cm_sidr_generic_msg *msg =
+ (struct cm_sidr_generic_msg *)mad;
+ return be32_to_cpu(msg->request_id);
+ } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
+ pr_err("trying to set local_comm_id in SIDR_REP\n");
+ return -1;
+ } else {
+ struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
+ return be32_to_cpu(msg->local_comm_id);
+ }
+}
+
+static void set_remote_comm_id(struct ib_mad *mad, u32 cm_id)
+{
+ if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
+ struct cm_sidr_generic_msg *msg =
+ (struct cm_sidr_generic_msg *)mad;
+ msg->request_id = cpu_to_be32(cm_id);
+ } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
+ pr_err("trying to set remote_comm_id in SIDR_REQ\n");
+ return;
+ } else {
+ struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
+ msg->remote_comm_id = cpu_to_be32(cm_id);
+ }
+}
+
+static u32 get_remote_comm_id(struct ib_mad *mad)
+{
+ if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
+ struct cm_sidr_generic_msg *msg =
+ (struct cm_sidr_generic_msg *)mad;
+ return be32_to_cpu(msg->request_id);
+ } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
+ pr_err("trying to set remote_comm_id in SIDR_REQ\n");
+ return -1;
+ } else {
+ struct cm_generic_msg *msg = (struct cm_generic_msg *)mad;
+ return be32_to_cpu(msg->remote_comm_id);
+ }
+}
+
+static union ib_gid gid_from_req_msg(struct ib_device *ibdev, struct ib_mad *mad)
+{
+ struct cm_req_msg *msg = (struct cm_req_msg *)mad;
+
+ return msg->primary_path_sgid;
+}
+
+/* Lock should be taken before called */
+static struct id_map_entry *
+id_map_find_by_sl_id(struct ib_device *ibdev, u32 slave_id, u32 sl_cm_id)
+{
+ struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map;
+ struct rb_node *node = sl_id_map->rb_node;
+
+ while (node) {
+ struct id_map_entry *id_map_entry =
+ rb_entry(node, struct id_map_entry, node);
+
+ if (id_map_entry->sl_cm_id > sl_cm_id)
+ node = node->rb_left;
+ else if (id_map_entry->sl_cm_id < sl_cm_id)
+ node = node->rb_right;
+ else if (id_map_entry->slave_id > slave_id)
+ node = node->rb_left;
+ else if (id_map_entry->slave_id < slave_id)
+ node = node->rb_right;
+ else
+ return id_map_entry;
+ }
+ return NULL;
+}
+
+static void id_map_ent_timeout(struct work_struct *work)
+{
+ struct delayed_work *delay = to_delayed_work(work);
+ struct id_map_entry *ent = container_of(delay, struct id_map_entry, timeout);
+ struct id_map_entry *found_ent;
+ struct mlx4_ib_dev *dev = ent->dev;
+ struct mlx4_ib_sriov *sriov = &dev->sriov;
+ struct rb_root *sl_id_map = &sriov->sl_id_map;
+
+ spin_lock(&sriov->id_map_lock);
+ if (!xa_erase(&sriov->pv_id_table, ent->pv_cm_id))
+ goto out;
+ found_ent = id_map_find_by_sl_id(&dev->ib_dev, ent->slave_id, ent->sl_cm_id);
+ if (found_ent && found_ent == ent)
+ rb_erase(&found_ent->node, sl_id_map);
+
+out:
+ list_del(&ent->list);
+ spin_unlock(&sriov->id_map_lock);
+ kfree(ent);
+}
+
+static void sl_id_map_add(struct ib_device *ibdev, struct id_map_entry *new)
+{
+ struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map;
+ struct rb_node **link = &sl_id_map->rb_node, *parent = NULL;
+ struct id_map_entry *ent;
+ int slave_id = new->slave_id;
+ int sl_cm_id = new->sl_cm_id;
+
+ ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id);
+ if (ent) {
+ pr_debug("overriding existing sl_id_map entry (cm_id = %x)\n",
+ sl_cm_id);
+
+ rb_replace_node(&ent->node, &new->node, sl_id_map);
+ return;
+ }
+
+ /* Go to the bottom of the tree */
+ while (*link) {
+ parent = *link;
+ ent = rb_entry(parent, struct id_map_entry, node);
+
+ if (ent->sl_cm_id > sl_cm_id || (ent->sl_cm_id == sl_cm_id && ent->slave_id > slave_id))
+ link = &(*link)->rb_left;
+ else
+ link = &(*link)->rb_right;
+ }
+
+ rb_link_node(&new->node, parent, link);
+ rb_insert_color(&new->node, sl_id_map);
+}
+
+static struct id_map_entry *
+id_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id)
+{
+ int ret;
+ struct id_map_entry *ent;
+ struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
+
+ ent = kmalloc(sizeof (struct id_map_entry), GFP_KERNEL);
+ if (!ent)
+ return ERR_PTR(-ENOMEM);
+
+ ent->sl_cm_id = sl_cm_id;
+ ent->slave_id = slave_id;
+ ent->scheduled_delete = 0;
+ ent->dev = to_mdev(ibdev);
+ INIT_DELAYED_WORK(&ent->timeout, id_map_ent_timeout);
+
+ ret = xa_alloc_cyclic(&sriov->pv_id_table, &ent->pv_cm_id, ent,
+ xa_limit_32b, &sriov->pv_id_next, GFP_KERNEL);
+ if (ret >= 0) {
+ spin_lock(&sriov->id_map_lock);
+ sl_id_map_add(ibdev, ent);
+ list_add_tail(&ent->list, &sriov->cm_list);
+ spin_unlock(&sriov->id_map_lock);
+ return ent;
+ }
+
+ /*error flow*/
+ kfree(ent);
+ mlx4_ib_warn(ibdev, "Allocation failed (err:0x%x)\n", ret);
+ return ERR_PTR(-ENOMEM);
+}
+
+static struct id_map_entry *
+id_map_get(struct ib_device *ibdev, int *pv_cm_id, int slave_id, int sl_cm_id)
+{
+ struct id_map_entry *ent;
+ struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
+
+ spin_lock(&sriov->id_map_lock);
+ if (*pv_cm_id == -1) {
+ ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id);
+ if (ent)
+ *pv_cm_id = (int) ent->pv_cm_id;
+ } else
+ ent = xa_load(&sriov->pv_id_table, *pv_cm_id);
+ spin_unlock(&sriov->id_map_lock);
+
+ return ent;
+}
+
+static void schedule_delayed(struct ib_device *ibdev, struct id_map_entry *id)
+{
+ struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
+ unsigned long flags;
+
+ spin_lock(&sriov->id_map_lock);
+ spin_lock_irqsave(&sriov->going_down_lock, flags);
+ /*make sure that there is no schedule inside the scheduled work.*/
+ if (!sriov->is_going_down && !id->scheduled_delete) {
+ id->scheduled_delete = 1;
+ queue_delayed_work(cm_wq, &id->timeout, CM_CLEANUP_CACHE_TIMEOUT);
+ } else if (id->scheduled_delete) {
+ /* Adjust timeout if already scheduled */
+ mod_delayed_work(cm_wq, &id->timeout, CM_CLEANUP_CACHE_TIMEOUT);
+ }
+ spin_unlock_irqrestore(&sriov->going_down_lock, flags);
+ spin_unlock(&sriov->id_map_lock);
+}
+
+#define REJ_REASON(m) be16_to_cpu(((struct cm_generic_msg *)(m))->rej_reason)
+int mlx4_ib_multiplex_cm_handler(struct ib_device *ibdev, int port, int slave_id,
+ struct ib_mad *mad)
+{
+ struct id_map_entry *id;
+ u32 sl_cm_id;
+ int pv_cm_id = -1;
+
+ if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_REP_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_MRA_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID ||
+ (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID && REJ_REASON(mad) == IB_CM_REJ_TIMEOUT)) {
+ sl_cm_id = get_local_comm_id(mad);
+ id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id);
+ if (id)
+ goto cont;
+ id = id_map_alloc(ibdev, slave_id, sl_cm_id);
+ if (IS_ERR(id)) {
+ mlx4_ib_warn(ibdev, "%s: id{slave: %d, sl_cm_id: 0x%x} Failed to id_map_alloc\n",
+ __func__, slave_id, sl_cm_id);
+ return PTR_ERR(id);
+ }
+ } else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) {
+ return 0;
+ } else {
+ sl_cm_id = get_local_comm_id(mad);
+ id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id);
+ }
+
+ if (!id) {
+ pr_debug("id{slave: %d, sl_cm_id: 0x%x} is NULL! attr_id: 0x%x\n",
+ slave_id, sl_cm_id, be16_to_cpu(mad->mad_hdr.attr_id));
+ return -EINVAL;
+ }
+
+cont:
+ set_local_comm_id(mad, id->pv_cm_id);
+
+ if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID)
+ schedule_delayed(ibdev, id);
+ return 0;
+}
+
+static void rej_tmout_timeout(struct work_struct *work)
+{
+ struct delayed_work *delay = to_delayed_work(work);
+ struct rej_tmout_entry *item = container_of(delay, struct rej_tmout_entry, timeout);
+ struct rej_tmout_entry *deleted;
+
+ deleted = xa_cmpxchg(item->xa_rej_tmout, item->rem_pv_cm_id, item, NULL, 0);
+
+ if (deleted != item)
+ pr_debug("deleted(%p) != item(%p)\n", deleted, item);
+
+ kfree(item);
+}
+
+static int alloc_rej_tmout(struct mlx4_ib_sriov *sriov, u32 rem_pv_cm_id, int slave)
+{
+ struct rej_tmout_entry *item;
+ struct rej_tmout_entry *old;
+ int ret = 0;
+
+ xa_lock(&sriov->xa_rej_tmout);
+ item = xa_load(&sriov->xa_rej_tmout, (unsigned long)rem_pv_cm_id);
+
+ if (item) {
+ if (xa_err(item))
+ ret = xa_err(item);
+ else
+ /* If a retry, adjust delayed work */
+ mod_delayed_work(cm_wq, &item->timeout, CM_CLEANUP_CACHE_TIMEOUT);
+ goto err_or_exists;
+ }
+ xa_unlock(&sriov->xa_rej_tmout);
+
+ item = kmalloc(sizeof(*item), GFP_KERNEL);
+ if (!item)
+ return -ENOMEM;
+
+ INIT_DELAYED_WORK(&item->timeout, rej_tmout_timeout);
+ item->slave = slave;
+ item->rem_pv_cm_id = rem_pv_cm_id;
+ item->xa_rej_tmout = &sriov->xa_rej_tmout;
+
+ old = xa_cmpxchg(&sriov->xa_rej_tmout, (unsigned long)rem_pv_cm_id, NULL, item, GFP_KERNEL);
+ if (old) {
+ pr_debug(
+ "Non-null old entry (%p) or error (%d) when inserting\n",
+ old, xa_err(old));
+ kfree(item);
+ return xa_err(old);
+ }
+
+ queue_delayed_work(cm_wq, &item->timeout, CM_CLEANUP_CACHE_TIMEOUT);
+
+ return 0;
+
+err_or_exists:
+ xa_unlock(&sriov->xa_rej_tmout);
+ return ret;
+}
+
+static int lookup_rej_tmout_slave(struct mlx4_ib_sriov *sriov, u32 rem_pv_cm_id)
+{
+ struct rej_tmout_entry *item;
+ int slave;
+
+ xa_lock(&sriov->xa_rej_tmout);
+ item = xa_load(&sriov->xa_rej_tmout, (unsigned long)rem_pv_cm_id);
+
+ if (!item || xa_err(item)) {
+ pr_debug("Could not find slave. rem_pv_cm_id 0x%x error: %d\n",
+ rem_pv_cm_id, xa_err(item));
+ slave = !item ? -ENOENT : xa_err(item);
+ } else {
+ slave = item->slave;
+ }
+ xa_unlock(&sriov->xa_rej_tmout);
+
+ return slave;
+}
+
+int mlx4_ib_demux_cm_handler(struct ib_device *ibdev, int port, int *slave,
+ struct ib_mad *mad)
+{
+ struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
+ u32 rem_pv_cm_id = get_local_comm_id(mad);
+ u32 pv_cm_id;
+ struct id_map_entry *id;
+ int sts;
+
+ if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) {
+ union ib_gid gid;
+
+ if (!slave)
+ return 0;
+
+ gid = gid_from_req_msg(ibdev, mad);
+ *slave = mlx4_ib_find_real_gid(ibdev, port, gid.global.interface_id);
+ if (*slave < 0) {
+ mlx4_ib_warn(ibdev, "failed matching slave_id by gid (0x%llx)\n",
+ be64_to_cpu(gid.global.interface_id));
+ return -ENOENT;
+ }
+
+ sts = alloc_rej_tmout(sriov, rem_pv_cm_id, *slave);
+ if (sts)
+ /* Even if this fails, we pass on the REQ to the slave */
+ pr_debug("Could not allocate rej_tmout entry. rem_pv_cm_id 0x%x slave %d status %d\n",
+ rem_pv_cm_id, *slave, sts);
+
+ return 0;
+ }
+
+ pv_cm_id = get_remote_comm_id(mad);
+ id = id_map_get(ibdev, (int *)&pv_cm_id, -1, -1);
+
+ if (!id) {
+ if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID &&
+ REJ_REASON(mad) == IB_CM_REJ_TIMEOUT && slave) {
+ *slave = lookup_rej_tmout_slave(sriov, rem_pv_cm_id);
+
+ return (*slave < 0) ? *slave : 0;
+ }
+ pr_debug("Couldn't find an entry for pv_cm_id 0x%x, attr_id 0x%x\n",
+ pv_cm_id, be16_to_cpu(mad->mad_hdr.attr_id));
+ return -ENOENT;
+ }
+
+ if (slave)
+ *slave = id->slave_id;
+ set_remote_comm_id(mad, id->sl_cm_id);
+
+ if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID ||
+ mad->mad_hdr.attr_id == CM_REJ_ATTR_ID)
+ schedule_delayed(ibdev, id);
+
+ return 0;
+}
+
+void mlx4_ib_cm_paravirt_init(struct mlx4_ib_dev *dev)
+{
+ spin_lock_init(&dev->sriov.id_map_lock);
+ INIT_LIST_HEAD(&dev->sriov.cm_list);
+ dev->sriov.sl_id_map = RB_ROOT;
+ xa_init_flags(&dev->sriov.pv_id_table, XA_FLAGS_ALLOC);
+ xa_init(&dev->sriov.xa_rej_tmout);
+}
+
+static void rej_tmout_xa_cleanup(struct mlx4_ib_sriov *sriov, int slave)
+{
+ struct rej_tmout_entry *item;
+ bool flush_needed = false;
+ unsigned long id;
+ int cnt = 0;
+
+ xa_lock(&sriov->xa_rej_tmout);
+ xa_for_each(&sriov->xa_rej_tmout, id, item) {
+ if (slave < 0 || slave == item->slave) {
+ mod_delayed_work(cm_wq, &item->timeout, 0);
+ flush_needed = true;
+ ++cnt;
+ }
+ }
+ xa_unlock(&sriov->xa_rej_tmout);
+
+ if (flush_needed) {
+ flush_workqueue(cm_wq);
+ pr_debug("Deleted %d entries in xarray for slave %d during cleanup\n",
+ cnt, slave);
+ }
+
+ if (slave < 0)
+ WARN_ON(!xa_empty(&sriov->xa_rej_tmout));
+}
+
+/* slave = -1 ==> all slaves */
+/* TBD -- call paravirt clean for single slave. Need for slave RESET event */
+void mlx4_ib_cm_paravirt_clean(struct mlx4_ib_dev *dev, int slave)
+{
+ struct mlx4_ib_sriov *sriov = &dev->sriov;
+ struct rb_root *sl_id_map = &sriov->sl_id_map;
+ struct list_head lh;
+ struct rb_node *nd;
+ int need_flush = 0;
+ struct id_map_entry *map, *tmp_map;
+ /* cancel all delayed work queue entries */
+ INIT_LIST_HEAD(&lh);
+ spin_lock(&sriov->id_map_lock);
+ list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) {
+ if (slave < 0 || slave == map->slave_id) {
+ if (map->scheduled_delete)
+ need_flush |= !cancel_delayed_work(&map->timeout);
+ }
+ }
+
+ spin_unlock(&sriov->id_map_lock);
+
+ if (need_flush)
+ flush_workqueue(cm_wq); /* make sure all timers were flushed */
+
+ /* now, remove all leftover entries from databases*/
+ spin_lock(&sriov->id_map_lock);
+ if (slave < 0) {
+ while (rb_first(sl_id_map)) {
+ struct id_map_entry *ent =
+ rb_entry(rb_first(sl_id_map),
+ struct id_map_entry, node);
+
+ rb_erase(&ent->node, sl_id_map);
+ xa_erase(&sriov->pv_id_table, ent->pv_cm_id);
+ }
+ list_splice_init(&dev->sriov.cm_list, &lh);
+ } else {
+ /* first, move nodes belonging to slave to db remove list */
+ nd = rb_first(sl_id_map);
+ while (nd) {
+ struct id_map_entry *ent =
+ rb_entry(nd, struct id_map_entry, node);
+ nd = rb_next(nd);
+ if (ent->slave_id == slave)
+ list_move_tail(&ent->list, &lh);
+ }
+ /* remove those nodes from databases */
+ list_for_each_entry_safe(map, tmp_map, &lh, list) {
+ rb_erase(&map->node, sl_id_map);
+ xa_erase(&sriov->pv_id_table, map->pv_cm_id);
+ }
+
+ /* add remaining nodes from cm_list */
+ list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) {
+ if (slave == map->slave_id)
+ list_move_tail(&map->list, &lh);
+ }
+ }
+
+ spin_unlock(&sriov->id_map_lock);
+
+ /* free any map entries left behind due to cancel_delayed_work above */
+ list_for_each_entry_safe(map, tmp_map, &lh, list) {
+ list_del(&map->list);
+ kfree(map);
+ }
+
+ rej_tmout_xa_cleanup(sriov, slave);
+}
+
+int mlx4_ib_cm_init(void)
+{
+ cm_wq = alloc_workqueue("mlx4_ib_cm", 0, 0);
+ if (!cm_wq)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void mlx4_ib_cm_destroy(void)
+{
+ destroy_workqueue(cm_wq);
+}