Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / infiniband / hw / mlx4 / cm.c
diff --git a/kernel/drivers/infiniband/hw/mlx4/cm.c b/kernel/drivers/infiniband/hw/mlx4/cm.c
new file mode 100644 (file)
index 0000000..39a4888
--- /dev/null
@@ -0,0 +1,478 @@
+/*
+ * 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  (5 * 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 cm_generic_msg {
+       struct ib_mad_hdr hdr;
+
+       __be32 local_comm_id;
+       __be32 remote_comm_id;
+};
+
+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 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 *db_ent, *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;
+       int pv_id = (int) ent->pv_cm_id;
+
+       spin_lock(&sriov->id_map_lock);
+       db_ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_id);
+       if (!db_ent)
+               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);
+       idr_remove(&sriov->pv_id_table, pv_id);
+
+out:
+       list_del(&ent->list);
+       spin_unlock(&sriov->id_map_lock);
+       kfree(ent);
+}
+
+static void id_map_find_del(struct ib_device *ibdev, int pv_cm_id)
+{
+       struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov;
+       struct rb_root *sl_id_map = &sriov->sl_id_map;
+       struct id_map_entry *ent, *found_ent;
+
+       spin_lock(&sriov->id_map_lock);
+       ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_cm_id);
+       if (!ent)
+               goto out;
+       found_ent = id_map_find_by_sl_id(ibdev, ent->slave_id, ent->sl_cm_id);
+       if (found_ent && found_ent == ent)
+               rb_erase(&found_ent->node, sl_id_map);
+       idr_remove(&sriov->pv_id_table, pv_cm_id);
+out:
+       spin_unlock(&sriov->id_map_lock);
+}
+
+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) {
+               mlx4_ib_warn(ibdev, "Couldn't allocate id cache entry - out of memory\n");
+               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);
+
+       idr_preload(GFP_KERNEL);
+       spin_lock(&to_mdev(ibdev)->sriov.id_map_lock);
+
+       ret = idr_alloc_cyclic(&sriov->pv_id_table, ent, 0, 0, GFP_NOWAIT);
+       if (ret >= 0) {
+               ent->pv_cm_id = (u32)ret;
+               sl_id_map_add(ibdev, ent);
+               list_add_tail(&ent->list, &sriov->cm_list);
+       }
+
+       spin_unlock(&sriov->id_map_lock);
+       idr_preload_end();
+
+       if (ret >= 0)
+               return ent;
+
+       /*error flow*/
+       kfree(ent);
+       mlx4_ib_warn(ibdev, "No more space in the idr (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 sl_cm_id, int slave_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, sl_cm_id, slave_id);
+               if (ent)
+                       *pv_cm_id = (int) ent->pv_cm_id;
+       } else
+               ent = (struct id_map_entry *)idr_find(&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 = 1;
+               schedule_delayed_work(&id->timeout, CM_CLEANUP_CACHE_TIMEOUT);
+       }
+       spin_unlock_irqrestore(&sriov->going_down_lock, flags);
+       spin_unlock(&sriov->id_map_lock);
+}
+
+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_SIDR_REQ_ATTR_ID) {
+               sl_cm_id = get_local_comm_id(mad);
+               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!\n",
+                        slave_id, sl_cm_id);
+               return -EINVAL;
+       }
+
+       set_local_comm_id(mad, id->pv_cm_id);
+
+       if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID)
+               schedule_delayed(ibdev, id);
+       else if (mad->mad_hdr.attr_id == CM_DREP_ATTR_ID)
+               id_map_find_del(ibdev, pv_cm_id);
+
+       return 0;
+}
+
+int mlx4_ib_demux_cm_handler(struct ib_device *ibdev, int port, int *slave,
+                            struct ib_mad *mad)
+{
+       u32 pv_cm_id;
+       struct id_map_entry *id;
+
+       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;
+               }
+               return 0;
+       }
+
+       pv_cm_id = get_remote_comm_id(mad);
+       id = id_map_get(ibdev, (int *)&pv_cm_id, -1, -1);
+
+       if (!id) {
+               pr_debug("Couldn't find an entry for pv_cm_id 0x%x\n", pv_cm_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)
+               schedule_delayed(ibdev, id);
+       else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID ||
+                       mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) {
+               id_map_find_del(ibdev, (int) pv_cm_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;
+       idr_init(&dev->sriov.pv_id_table);
+}
+
+/* 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 = 1;
+       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_scheduled_work(); /* 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);
+                       idr_remove(&sriov->pv_id_table, (int) 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);
+                       idr_remove(&sriov->pv_id_table, (int) 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);
+       }
+}