diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/infiniband/hw/mlx4/cm.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/infiniband/hw/mlx4/cm.c')
-rw-r--r-- | drivers/infiniband/hw/mlx4/cm.c | 604 |
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 000000000..12b481d13 --- /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); +} |