| /* |
| * 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 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 *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 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 = xa_erase(&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); |
| 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) |
| 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 = 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_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!\n", |
| slave_id, sl_cm_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); |
| 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; |
| xa_init_flags(&dev->sriov.pv_id_table, XA_FLAGS_ALLOC); |
| } |
| |
| /* 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_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); |
| 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); |
| } |
| } |