1255932Salfred/* 2255932Salfred * Copyright (c) 2012 Mellanox Technologies. All rights reserved. 3255932Salfred * 4255932Salfred * This software is available to you under a choice of one of two 5255932Salfred * licenses. You may choose to be licensed under the terms of the GNU 6255932Salfred * General Public License (GPL) Version 2, available from the file 7255932Salfred * COPYING in the main directory of this source tree, or the 8255932Salfred * OpenIB.org BSD license below: 9255932Salfred * 10255932Salfred * Redistribution and use in source and binary forms, with or 11255932Salfred * without modification, are permitted provided that the following 12255932Salfred * conditions are met: 13255932Salfred * 14255932Salfred * - Redistributions of source code must retain the above 15255932Salfred * copyright notice, this list of conditions and the following 16255932Salfred * disclaimer. 17255932Salfred * 18255932Salfred * - Redistributions in binary form must reproduce the above 19255932Salfred * copyright notice, this list of conditions and the following 20255932Salfred * disclaimer in the documentation and/or other materials 21255932Salfred * provided with the distribution. 22255932Salfred * 23255932Salfred * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24255932Salfred * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25255932Salfred * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26255932Salfred * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27255932Salfred * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28255932Salfred * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29255932Salfred * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30255932Salfred * SOFTWARE. 31255932Salfred */ 32255932Salfred 33255932Salfred#include <rdma/ib_mad.h> 34255932Salfred 35255932Salfred#include <linux/mlx4/cmd.h> 36255932Salfred#include <linux/idr.h> 37255932Salfred#include <rdma/ib_cm.h> 38255932Salfred 39255932Salfred#include "mlx4_ib.h" 40255932Salfred 41255932Salfred#define CM_CLEANUP_CACHE_TIMEOUT (5 * HZ) 42255932Salfred 43255932Salfredstruct id_map_entry { 44255932Salfred struct rb_node node; 45255932Salfred 46255932Salfred u32 sl_cm_id; 47255932Salfred u32 pv_cm_id; 48255932Salfred int slave_id; 49255932Salfred int scheduled_delete; 50255932Salfred struct mlx4_ib_dev *dev; 51255932Salfred 52255932Salfred struct list_head list; 53255932Salfred struct delayed_work timeout; 54255932Salfred}; 55255932Salfred 56255932Salfredstruct cm_generic_msg { 57255932Salfred struct ib_mad_hdr hdr; 58255932Salfred 59255932Salfred __be32 local_comm_id; 60255932Salfred __be32 remote_comm_id; 61255932Salfred}; 62255932Salfred 63255932Salfredstruct cm_req_msg { 64255932Salfred unsigned char unused[0x60]; 65255932Salfred union ib_gid primary_path_sgid; 66255932Salfred}; 67255932Salfred 68255932Salfred 69255932Salfredstatic void set_local_comm_id(struct ib_mad *mad, u32 cm_id) 70255932Salfred{ 71255932Salfred struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 72255932Salfred msg->local_comm_id = cpu_to_be32(cm_id); 73255932Salfred} 74255932Salfred 75255932Salfredstatic u32 get_local_comm_id(struct ib_mad *mad) 76255932Salfred{ 77255932Salfred struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 78255932Salfred 79255932Salfred return be32_to_cpu(msg->local_comm_id); 80255932Salfred} 81255932Salfred 82255932Salfredstatic void set_remote_comm_id(struct ib_mad *mad, u32 cm_id) 83255932Salfred{ 84255932Salfred struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 85255932Salfred msg->remote_comm_id = cpu_to_be32(cm_id); 86255932Salfred} 87255932Salfred 88255932Salfredstatic u32 get_remote_comm_id(struct ib_mad *mad) 89255932Salfred{ 90255932Salfred struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 91255932Salfred 92255932Salfred return be32_to_cpu(msg->remote_comm_id); 93255932Salfred} 94255932Salfred 95255932Salfredstatic union ib_gid gid_from_req_msg(struct ib_device *ibdev, struct ib_mad *mad) 96255932Salfred{ 97255932Salfred struct cm_req_msg *msg = (struct cm_req_msg *)mad; 98255932Salfred 99255932Salfred return msg->primary_path_sgid; 100255932Salfred} 101255932Salfred 102255932Salfred/* Lock should be taken before called */ 103255932Salfredstatic struct id_map_entry * 104255932Salfredid_map_find_by_sl_id(struct ib_device *ibdev, u32 slave_id, u32 sl_cm_id) 105255932Salfred{ 106255932Salfred struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map; 107255932Salfred struct rb_node *node = sl_id_map->rb_node; 108255932Salfred 109255932Salfred while (node) { 110255932Salfred struct id_map_entry *id_map_entry = 111255932Salfred rb_entry(node, struct id_map_entry, node); 112255932Salfred 113255932Salfred if (id_map_entry->sl_cm_id > sl_cm_id) 114255932Salfred node = node->rb_left; 115255932Salfred else if (id_map_entry->sl_cm_id < sl_cm_id) 116255932Salfred node = node->rb_right; 117255932Salfred else if (id_map_entry->slave_id > slave_id) 118255932Salfred node = node->rb_left; 119255932Salfred else if (id_map_entry->slave_id < slave_id) 120255932Salfred node = node->rb_right; 121255932Salfred else 122255932Salfred return id_map_entry; 123255932Salfred } 124255932Salfred return NULL; 125255932Salfred} 126255932Salfred 127255932Salfredstatic void id_map_ent_timeout(struct work_struct *work) 128255932Salfred{ 129255932Salfred struct delayed_work *delay = to_delayed_work(work); 130255932Salfred struct id_map_entry *ent = container_of(delay, struct id_map_entry, timeout); 131255932Salfred struct id_map_entry *db_ent, *found_ent; 132255932Salfred struct mlx4_ib_dev *dev = ent->dev; 133255932Salfred struct mlx4_ib_sriov *sriov = &dev->sriov; 134255932Salfred struct rb_root *sl_id_map = &sriov->sl_id_map; 135255932Salfred int pv_id = (int) ent->pv_cm_id; 136255932Salfred 137255932Salfred spin_lock(&sriov->id_map_lock); 138255932Salfred db_ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_id); 139255932Salfred if (!db_ent) 140255932Salfred goto out; 141255932Salfred found_ent = id_map_find_by_sl_id(&dev->ib_dev, ent->slave_id, ent->sl_cm_id); 142255932Salfred if (found_ent && found_ent == ent) 143255932Salfred rb_erase(&found_ent->node, sl_id_map); 144255932Salfred idr_remove(&sriov->pv_id_table, pv_id); 145255932Salfred 146255932Salfredout: 147255932Salfred list_del(&ent->list); 148255932Salfred spin_unlock(&sriov->id_map_lock); 149255932Salfred kfree(ent); 150255932Salfred} 151255932Salfred 152255932Salfredstatic void id_map_find_del(struct ib_device *ibdev, int pv_cm_id) 153255932Salfred{ 154255932Salfred struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 155255932Salfred struct rb_root *sl_id_map = &sriov->sl_id_map; 156255932Salfred struct id_map_entry *ent, *found_ent; 157255932Salfred 158255932Salfred spin_lock(&sriov->id_map_lock); 159255932Salfred ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_cm_id); 160255932Salfred if (!ent) 161255932Salfred goto out; 162255932Salfred found_ent = id_map_find_by_sl_id(ibdev, ent->slave_id, ent->sl_cm_id); 163255932Salfred if (found_ent && found_ent == ent) 164255932Salfred rb_erase(&found_ent->node, sl_id_map); 165255932Salfred idr_remove(&sriov->pv_id_table, pv_cm_id); 166255932Salfredout: 167255932Salfred spin_unlock(&sriov->id_map_lock); 168255932Salfred} 169255932Salfred 170255932Salfredstatic void sl_id_map_add(struct ib_device *ibdev, struct id_map_entry *new) 171255932Salfred{ 172255932Salfred struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map; 173255932Salfred struct rb_node **link = &sl_id_map->rb_node, *parent = NULL; 174255932Salfred struct id_map_entry *ent; 175255932Salfred int slave_id = new->slave_id; 176255932Salfred int sl_cm_id = new->sl_cm_id; 177255932Salfred 178255932Salfred ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id); 179255932Salfred if (ent) { 180255932Salfred pr_debug("overriding existing sl_id_map entry (cm_id = %x)\n", 181255932Salfred sl_cm_id); 182255932Salfred 183255932Salfred rb_replace_node(&ent->node, &new->node, sl_id_map); 184255932Salfred return; 185255932Salfred } 186255932Salfred 187255932Salfred /* Go to the bottom of the tree */ 188255932Salfred while (*link) { 189255932Salfred parent = *link; 190255932Salfred ent = rb_entry(parent, struct id_map_entry, node); 191255932Salfred 192255932Salfred if (ent->sl_cm_id > sl_cm_id || (ent->sl_cm_id == sl_cm_id && ent->slave_id > slave_id)) 193255932Salfred link = &(*link)->rb_left; 194255932Salfred else 195255932Salfred link = &(*link)->rb_right; 196255932Salfred } 197255932Salfred 198255932Salfred rb_link_node(&new->node, parent, link); 199255932Salfred rb_insert_color(&new->node, sl_id_map); 200255932Salfred} 201255932Salfred 202255932Salfredstatic struct id_map_entry * 203255932Salfredid_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id) 204255932Salfred{ 205255932Salfred int ret, id; 206255932Salfred static int next_id; 207255932Salfred struct id_map_entry *ent; 208255932Salfred struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 209255932Salfred 210255932Salfred ent = kmalloc(sizeof (struct id_map_entry), GFP_KERNEL); 211255932Salfred if (!ent) { 212255932Salfred mlx4_ib_warn(ibdev, "Couldn't allocate id cache entry - out of memory\n"); 213255932Salfred return ERR_PTR(-ENOMEM); 214255932Salfred } 215255932Salfred 216255932Salfred ent->sl_cm_id = sl_cm_id; 217255932Salfred ent->slave_id = slave_id; 218255932Salfred ent->scheduled_delete = 0; 219255932Salfred ent->dev = to_mdev(ibdev); 220255932Salfred INIT_DELAYED_WORK(&ent->timeout, id_map_ent_timeout); 221255932Salfred 222255932Salfred do { 223255932Salfred spin_lock(&to_mdev(ibdev)->sriov.id_map_lock); 224255932Salfred ret = idr_get_new_above(&sriov->pv_id_table, ent, 225255932Salfred next_id, &id); 226255932Salfred if (!ret) { 227255932Salfred next_id = ((unsigned) id + 1) & MAX_IDR_MASK; 228255932Salfred ent->pv_cm_id = (u32)id; 229255932Salfred sl_id_map_add(ibdev, ent); 230255932Salfred } 231255932Salfred 232255932Salfred spin_unlock(&sriov->id_map_lock); 233255932Salfred } while (ret == -EAGAIN && idr_pre_get(&sriov->pv_id_table, GFP_KERNEL)); 234255932Salfred /*the function idr_get_new_above can return -ENOSPC, so don't insert in that case.*/ 235255932Salfred if (!ret) { 236255932Salfred spin_lock(&sriov->id_map_lock); 237255932Salfred list_add_tail(&ent->list, &sriov->cm_list); 238255932Salfred spin_unlock(&sriov->id_map_lock); 239255932Salfred return ent; 240255932Salfred } 241255932Salfred /*error flow*/ 242255932Salfred kfree(ent); 243255932Salfred mlx4_ib_warn(ibdev, "No more space in the idr (err:0x%x)\n", ret); 244255932Salfred return ERR_PTR(-ENOMEM); 245255932Salfred} 246255932Salfred 247255932Salfredstatic struct id_map_entry * 248255932Salfredid_map_get(struct ib_device *ibdev, int *pv_cm_id, int sl_cm_id, int slave_id) 249255932Salfred{ 250255932Salfred struct id_map_entry *ent; 251255932Salfred struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 252255932Salfred 253255932Salfred spin_lock(&sriov->id_map_lock); 254255932Salfred if (*pv_cm_id == -1) { 255255932Salfred ent = id_map_find_by_sl_id(ibdev, sl_cm_id, slave_id); 256255932Salfred if (ent) 257255932Salfred *pv_cm_id = (int) ent->pv_cm_id; 258255932Salfred } else 259255932Salfred ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, *pv_cm_id); 260255932Salfred spin_unlock(&sriov->id_map_lock); 261255932Salfred 262255932Salfred return ent; 263255932Salfred} 264255932Salfred 265255932Salfredstatic void schedule_delayed(struct ib_device *ibdev, struct id_map_entry *id) 266255932Salfred{ 267255932Salfred struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 268255932Salfred unsigned long flags; 269255932Salfred 270255932Salfred spin_lock(&sriov->id_map_lock); 271255932Salfred spin_lock_irqsave(&sriov->going_down_lock, flags); 272255932Salfred /*make sure that there is no schedule inside the scheduled work.*/ 273255932Salfred if (!sriov->is_going_down) { 274255932Salfred id->scheduled_delete = 1; 275255932Salfred schedule_delayed_work(&id->timeout, CM_CLEANUP_CACHE_TIMEOUT); 276255932Salfred } 277255932Salfred spin_unlock_irqrestore(&sriov->going_down_lock, flags); 278255932Salfred spin_unlock(&sriov->id_map_lock); 279255932Salfred} 280255932Salfred 281255932Salfredint mlx4_ib_multiplex_cm_handler(struct ib_device *ibdev, int port, int slave_id, 282255932Salfred struct ib_mad *mad) 283255932Salfred{ 284255932Salfred struct id_map_entry *id; 285255932Salfred u32 sl_cm_id; 286255932Salfred int pv_cm_id = -1; 287255932Salfred 288255932Salfred sl_cm_id = get_local_comm_id(mad); 289255932Salfred 290255932Salfred if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID || 291255932Salfred mad->mad_hdr.attr_id == CM_REP_ATTR_ID) { 292255932Salfred id = id_map_alloc(ibdev, slave_id, sl_cm_id); 293255932Salfred if (IS_ERR(id)) { 294255932Salfred mlx4_ib_warn(ibdev, "%s: id{slave: %d, sl_cm_id: 0x%x} Failed to id_map_alloc\n", 295255932Salfred __func__, slave_id, sl_cm_id); 296255932Salfred return PTR_ERR(id); 297255932Salfred } 298255932Salfred } else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID) { 299255932Salfred return 0; 300255932Salfred } else { 301255932Salfred id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id); 302255932Salfred } 303255932Salfred 304255932Salfred if (!id) { 305255932Salfred pr_debug("id{slave: %d, sl_cm_id: 0x%x} is NULL!\n", 306255932Salfred slave_id, sl_cm_id); 307255932Salfred return -EINVAL; 308255932Salfred } 309255932Salfred 310255932Salfred set_local_comm_id(mad, id->pv_cm_id); 311255932Salfred 312255932Salfred if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID) 313255932Salfred schedule_delayed(ibdev, id); 314255932Salfred else if (mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) 315255932Salfred id_map_find_del(ibdev, pv_cm_id); 316255932Salfred 317255932Salfred return 0; 318255932Salfred} 319255932Salfred 320255932Salfredint mlx4_ib_demux_cm_handler(struct ib_device *ibdev, int port, int *slave, 321255932Salfred struct ib_mad *mad, int is_eth) 322255932Salfred{ 323255932Salfred u32 pv_cm_id; 324255932Salfred struct id_map_entry *id; 325255932Salfred 326255932Salfred if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID) { 327255932Salfred union ib_gid gid; 328255932Salfred 329255932Salfred if (is_eth) 330255932Salfred return 0; 331255932Salfred 332255932Salfred gid = gid_from_req_msg(ibdev, mad); 333255932Salfred *slave = mlx4_ib_find_real_gid(ibdev, port, gid.global.interface_id); 334255932Salfred if (*slave < 0) { 335255932Salfred mlx4_ib_warn(ibdev, "failed matching slave_id by gid (0x%llx)\n", 336271127Shselasky (long long)gid.global.interface_id); 337255932Salfred return -ENOENT; 338255932Salfred } 339255932Salfred return 0; 340255932Salfred } 341255932Salfred 342255932Salfred pv_cm_id = get_remote_comm_id(mad); 343255932Salfred id = id_map_get(ibdev, (int *)&pv_cm_id, -1, -1); 344255932Salfred 345255932Salfred if (!id) { 346255932Salfred pr_debug("Couldn't find an entry for pv_cm_id 0x%x\n", pv_cm_id); 347255932Salfred return -ENOENT; 348255932Salfred } 349255932Salfred 350255932Salfred if (!is_eth) 351255932Salfred *slave = id->slave_id; 352255932Salfred set_remote_comm_id(mad, id->sl_cm_id); 353255932Salfred 354255932Salfred if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID) 355255932Salfred schedule_delayed(ibdev, id); 356255932Salfred else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID || 357255932Salfred mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) { 358255932Salfred id_map_find_del(ibdev, (int) pv_cm_id); 359255932Salfred } 360255932Salfred 361255932Salfred return 0; 362255932Salfred} 363255932Salfred 364255932Salfredvoid mlx4_ib_cm_paravirt_init(struct mlx4_ib_dev *dev) 365255932Salfred{ 366255932Salfred spin_lock_init(&dev->sriov.id_map_lock); 367255932Salfred INIT_LIST_HEAD(&dev->sriov.cm_list); 368255932Salfred dev->sriov.sl_id_map = RB_ROOT; 369255932Salfred idr_init(&dev->sriov.pv_id_table); 370255932Salfred idr_pre_get(&dev->sriov.pv_id_table, GFP_KERNEL); 371255932Salfred} 372255932Salfred 373255932Salfred/* slave = -1 ==> all slaves */ 374255932Salfred/* TBD -- call paravirt clean for single slave. Need for slave RESET event */ 375255932Salfredvoid mlx4_ib_cm_paravirt_clean(struct mlx4_ib_dev *dev, int slave) 376255932Salfred{ 377255932Salfred struct mlx4_ib_sriov *sriov = &dev->sriov; 378255932Salfred struct rb_root *sl_id_map = &sriov->sl_id_map; 379255932Salfred struct list_head lh; 380255932Salfred struct rb_node *nd; 381255932Salfred int need_flush = 1; 382255932Salfred struct id_map_entry *map, *tmp_map; 383255932Salfred /* cancel all delayed work queue entries */ 384255932Salfred INIT_LIST_HEAD(&lh); 385255932Salfred spin_lock(&sriov->id_map_lock); 386255932Salfred list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) { 387255932Salfred if (slave < 0 || slave == map->slave_id) { 388255932Salfred if (map->scheduled_delete) 389255932Salfred need_flush &= !!cancel_delayed_work(&map->timeout); 390255932Salfred } 391255932Salfred } 392255932Salfred 393255932Salfred spin_unlock(&sriov->id_map_lock); 394255932Salfred 395255932Salfred if (!need_flush) 396255932Salfred flush_scheduled_work(); /* make sure all timers were flushed */ 397255932Salfred 398255932Salfred /* now, remove all leftover entries from databases*/ 399255932Salfred spin_lock(&sriov->id_map_lock); 400255932Salfred if (slave < 0) { 401255932Salfred while (rb_first(sl_id_map)) { 402255932Salfred struct id_map_entry *ent = 403255932Salfred rb_entry(rb_first(sl_id_map), 404255932Salfred struct id_map_entry, node); 405255932Salfred 406255932Salfred rb_erase(&ent->node, sl_id_map); 407255932Salfred idr_remove(&sriov->pv_id_table, (int) ent->pv_cm_id); 408255932Salfred } 409255932Salfred list_splice_init(&dev->sriov.cm_list, &lh); 410255932Salfred } else { 411255932Salfred /* first, move nodes belonging to slave to db remove list */ 412255932Salfred nd = rb_first(sl_id_map); 413255932Salfred while (nd) { 414255932Salfred struct id_map_entry *ent = 415255932Salfred rb_entry(nd, struct id_map_entry, node); 416255932Salfred nd = rb_next(nd); 417255932Salfred if (ent->slave_id == slave) 418255932Salfred list_move_tail(&ent->list, &lh); 419255932Salfred } 420255932Salfred /* remove those nodes from databases */ 421255932Salfred list_for_each_entry_safe(map, tmp_map, &lh, list) { 422255932Salfred rb_erase(&map->node, sl_id_map); 423255932Salfred idr_remove(&sriov->pv_id_table, (int) map->pv_cm_id); 424255932Salfred } 425255932Salfred 426255932Salfred /* add remaining nodes from cm_list */ 427255932Salfred list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) { 428255932Salfred if (slave == map->slave_id) 429255932Salfred list_move_tail(&map->list, &lh); 430255932Salfred } 431255932Salfred } 432255932Salfred 433255932Salfred spin_unlock(&sriov->id_map_lock); 434255932Salfred 435255932Salfred /* free any map entries left behind due to cancel_delayed_work above */ 436255932Salfred list_for_each_entry_safe(map, tmp_map, &lh, list) { 437255932Salfred list_del(&map->list); 438255932Salfred kfree(map); 439255932Salfred } 440255932Salfred} 441