/* * 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 *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) 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 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 = (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); } else if (id->scheduled_delete) { /* Adjust timeout if already scheduled */ mod_delayed_work(system_wq, &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; 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 = 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); 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); } }