1 /* 2 * Copyright (c) 2012 Mellanox Technologies. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <rdma/ib_mad.h> 34 35 #include <linux/mlx4/cmd.h> 36 #include <linux/rbtree.h> 37 #include <linux/idr.h> 38 #include <rdma/ib_cm.h> 39 40 #include "mlx4_ib.h" 41 42 #define CM_CLEANUP_CACHE_TIMEOUT (5 * HZ) 43 44 struct id_map_entry { 45 struct rb_node node; 46 47 u32 sl_cm_id; 48 u32 pv_cm_id; 49 int slave_id; 50 int scheduled_delete; 51 struct mlx4_ib_dev *dev; 52 53 struct list_head list; 54 struct delayed_work timeout; 55 }; 56 57 struct cm_generic_msg { 58 struct ib_mad_hdr hdr; 59 60 __be32 local_comm_id; 61 __be32 remote_comm_id; 62 }; 63 64 struct cm_sidr_generic_msg { 65 struct ib_mad_hdr hdr; 66 __be32 request_id; 67 }; 68 69 struct cm_req_msg { 70 unsigned char unused[0x60]; 71 union ib_gid primary_path_sgid; 72 }; 73 74 75 static void set_local_comm_id(struct ib_mad *mad, u32 cm_id) 76 { 77 if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 78 struct cm_sidr_generic_msg *msg = 79 (struct cm_sidr_generic_msg *)mad; 80 msg->request_id = cpu_to_be32(cm_id); 81 } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) { 82 pr_err("trying to set local_comm_id in SIDR_REP\n"); 83 return; 84 } else { 85 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 86 msg->local_comm_id = cpu_to_be32(cm_id); 87 } 88 } 89 90 static u32 get_local_comm_id(struct ib_mad *mad) 91 { 92 if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 93 struct cm_sidr_generic_msg *msg = 94 (struct cm_sidr_generic_msg *)mad; 95 return be32_to_cpu(msg->request_id); 96 } else if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) { 97 pr_err("trying to set local_comm_id in SIDR_REP\n"); 98 return -1; 99 } else { 100 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 101 return be32_to_cpu(msg->local_comm_id); 102 } 103 } 104 105 static void set_remote_comm_id(struct ib_mad *mad, u32 cm_id) 106 { 107 if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) { 108 struct cm_sidr_generic_msg *msg = 109 (struct cm_sidr_generic_msg *)mad; 110 msg->request_id = cpu_to_be32(cm_id); 111 } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 112 pr_err("trying to set remote_comm_id in SIDR_REQ\n"); 113 return; 114 } else { 115 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 116 msg->remote_comm_id = cpu_to_be32(cm_id); 117 } 118 } 119 120 static u32 get_remote_comm_id(struct ib_mad *mad) 121 { 122 if (mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) { 123 struct cm_sidr_generic_msg *msg = 124 (struct cm_sidr_generic_msg *)mad; 125 return be32_to_cpu(msg->request_id); 126 } else if (mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 127 pr_err("trying to set remote_comm_id in SIDR_REQ\n"); 128 return -1; 129 } else { 130 struct cm_generic_msg *msg = (struct cm_generic_msg *)mad; 131 return be32_to_cpu(msg->remote_comm_id); 132 } 133 } 134 135 static union ib_gid gid_from_req_msg(struct ib_device *ibdev, struct ib_mad *mad) 136 { 137 struct cm_req_msg *msg = (struct cm_req_msg *)mad; 138 139 return msg->primary_path_sgid; 140 } 141 142 /* Lock should be taken before called */ 143 static struct id_map_entry * 144 id_map_find_by_sl_id(struct ib_device *ibdev, u32 slave_id, u32 sl_cm_id) 145 { 146 struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map; 147 struct rb_node *node = sl_id_map->rb_node; 148 149 while (node) { 150 struct id_map_entry *id_map_entry = 151 rb_entry(node, struct id_map_entry, node); 152 153 if (id_map_entry->sl_cm_id > sl_cm_id) 154 node = node->rb_left; 155 else if (id_map_entry->sl_cm_id < sl_cm_id) 156 node = node->rb_right; 157 else if (id_map_entry->slave_id > slave_id) 158 node = node->rb_left; 159 else if (id_map_entry->slave_id < slave_id) 160 node = node->rb_right; 161 else 162 return id_map_entry; 163 } 164 return NULL; 165 } 166 167 static void id_map_ent_timeout(struct work_struct *work) 168 { 169 struct delayed_work *delay = to_delayed_work(work); 170 struct id_map_entry *ent = container_of(delay, struct id_map_entry, timeout); 171 struct id_map_entry *db_ent, *found_ent; 172 struct mlx4_ib_dev *dev = ent->dev; 173 struct mlx4_ib_sriov *sriov = &dev->sriov; 174 struct rb_root *sl_id_map = &sriov->sl_id_map; 175 int pv_id = (int) ent->pv_cm_id; 176 177 spin_lock(&sriov->id_map_lock); 178 db_ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_id); 179 if (!db_ent) 180 goto out; 181 found_ent = id_map_find_by_sl_id(&dev->ib_dev, ent->slave_id, ent->sl_cm_id); 182 if (found_ent && found_ent == ent) 183 rb_erase(&found_ent->node, sl_id_map); 184 idr_remove(&sriov->pv_id_table, pv_id); 185 186 out: 187 list_del(&ent->list); 188 spin_unlock(&sriov->id_map_lock); 189 kfree(ent); 190 } 191 192 static void id_map_find_del(struct ib_device *ibdev, int pv_cm_id) 193 { 194 struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 195 struct rb_root *sl_id_map = &sriov->sl_id_map; 196 struct id_map_entry *ent, *found_ent; 197 198 spin_lock(&sriov->id_map_lock); 199 ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, pv_cm_id); 200 if (!ent) 201 goto out; 202 found_ent = id_map_find_by_sl_id(ibdev, ent->slave_id, ent->sl_cm_id); 203 if (found_ent && found_ent == ent) 204 rb_erase(&found_ent->node, sl_id_map); 205 idr_remove(&sriov->pv_id_table, pv_cm_id); 206 out: 207 spin_unlock(&sriov->id_map_lock); 208 } 209 210 static void sl_id_map_add(struct ib_device *ibdev, struct id_map_entry *new) 211 { 212 struct rb_root *sl_id_map = &to_mdev(ibdev)->sriov.sl_id_map; 213 struct rb_node **link = &sl_id_map->rb_node, *parent = NULL; 214 struct id_map_entry *ent; 215 int slave_id = new->slave_id; 216 int sl_cm_id = new->sl_cm_id; 217 218 ent = id_map_find_by_sl_id(ibdev, slave_id, sl_cm_id); 219 if (ent) { 220 pr_debug("overriding existing sl_id_map entry (cm_id = %x)\n", 221 sl_cm_id); 222 223 rb_replace_node(&ent->node, &new->node, sl_id_map); 224 return; 225 } 226 227 /* Go to the bottom of the tree */ 228 while (*link) { 229 parent = *link; 230 ent = rb_entry(parent, struct id_map_entry, node); 231 232 if (ent->sl_cm_id > sl_cm_id || (ent->sl_cm_id == sl_cm_id && ent->slave_id > slave_id)) 233 link = &(*link)->rb_left; 234 else 235 link = &(*link)->rb_right; 236 } 237 238 rb_link_node(&new->node, parent, link); 239 rb_insert_color(&new->node, sl_id_map); 240 } 241 242 static struct id_map_entry * 243 id_map_alloc(struct ib_device *ibdev, int slave_id, u32 sl_cm_id) 244 { 245 int ret; 246 struct id_map_entry *ent; 247 struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 248 249 ent = kmalloc(sizeof (struct id_map_entry), GFP_KERNEL); 250 if (!ent) { 251 mlx4_ib_warn(ibdev, "Couldn't allocate id cache entry - out of memory\n"); 252 return ERR_PTR(-ENOMEM); 253 } 254 255 ent->sl_cm_id = sl_cm_id; 256 ent->slave_id = slave_id; 257 ent->scheduled_delete = 0; 258 ent->dev = to_mdev(ibdev); 259 INIT_DELAYED_WORK(&ent->timeout, id_map_ent_timeout); 260 261 idr_preload(GFP_KERNEL); 262 spin_lock(&to_mdev(ibdev)->sriov.id_map_lock); 263 264 ret = idr_alloc_cyclic(&sriov->pv_id_table, ent, 0, 0, GFP_NOWAIT); 265 if (ret >= 0) { 266 ent->pv_cm_id = (u32)ret; 267 sl_id_map_add(ibdev, ent); 268 list_add_tail(&ent->list, &sriov->cm_list); 269 } 270 271 spin_unlock(&sriov->id_map_lock); 272 idr_preload_end(); 273 274 if (ret >= 0) 275 return ent; 276 277 /*error flow*/ 278 kfree(ent); 279 mlx4_ib_warn(ibdev, "No more space in the idr (err:0x%x)\n", ret); 280 return ERR_PTR(-ENOMEM); 281 } 282 283 static struct id_map_entry * 284 id_map_get(struct ib_device *ibdev, int *pv_cm_id, int sl_cm_id, int slave_id) 285 { 286 struct id_map_entry *ent; 287 struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 288 289 spin_lock(&sriov->id_map_lock); 290 if (*pv_cm_id == -1) { 291 ent = id_map_find_by_sl_id(ibdev, sl_cm_id, slave_id); 292 if (ent) 293 *pv_cm_id = (int) ent->pv_cm_id; 294 } else 295 ent = (struct id_map_entry *)idr_find(&sriov->pv_id_table, *pv_cm_id); 296 spin_unlock(&sriov->id_map_lock); 297 298 return ent; 299 } 300 301 static void schedule_delayed(struct ib_device *ibdev, struct id_map_entry *id) 302 { 303 struct mlx4_ib_sriov *sriov = &to_mdev(ibdev)->sriov; 304 unsigned long flags; 305 306 spin_lock(&sriov->id_map_lock); 307 spin_lock_irqsave(&sriov->going_down_lock, flags); 308 /*make sure that there is no schedule inside the scheduled work.*/ 309 if (!sriov->is_going_down) { 310 id->scheduled_delete = 1; 311 schedule_delayed_work(&id->timeout, CM_CLEANUP_CACHE_TIMEOUT); 312 } 313 spin_unlock_irqrestore(&sriov->going_down_lock, flags); 314 spin_unlock(&sriov->id_map_lock); 315 } 316 317 int mlx4_ib_multiplex_cm_handler(struct ib_device *ibdev, int port, int slave_id, 318 struct ib_mad *mad) 319 { 320 struct id_map_entry *id; 321 u32 sl_cm_id; 322 int pv_cm_id = -1; 323 324 if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID || 325 mad->mad_hdr.attr_id == CM_REP_ATTR_ID || 326 mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 327 sl_cm_id = get_local_comm_id(mad); 328 id = id_map_alloc(ibdev, slave_id, sl_cm_id); 329 if (IS_ERR(id)) { 330 mlx4_ib_warn(ibdev, "%s: id{slave: %d, sl_cm_id: 0x%x} Failed to id_map_alloc\n", 331 __func__, slave_id, sl_cm_id); 332 return PTR_ERR(id); 333 } 334 } else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID || 335 mad->mad_hdr.attr_id == CM_SIDR_REP_ATTR_ID) { 336 return 0; 337 } else { 338 sl_cm_id = get_local_comm_id(mad); 339 id = id_map_get(ibdev, &pv_cm_id, slave_id, sl_cm_id); 340 } 341 342 if (!id) { 343 pr_debug("id{slave: %d, sl_cm_id: 0x%x} is NULL!\n", 344 slave_id, sl_cm_id); 345 return -EINVAL; 346 } 347 348 set_local_comm_id(mad, id->pv_cm_id); 349 350 if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID) 351 schedule_delayed(ibdev, id); 352 else if (mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) 353 id_map_find_del(ibdev, pv_cm_id); 354 355 return 0; 356 } 357 358 int mlx4_ib_demux_cm_handler(struct ib_device *ibdev, int port, int *slave, 359 struct ib_mad *mad) 360 { 361 u32 pv_cm_id; 362 struct id_map_entry *id; 363 364 if (mad->mad_hdr.attr_id == CM_REQ_ATTR_ID || 365 mad->mad_hdr.attr_id == CM_SIDR_REQ_ATTR_ID) { 366 union ib_gid gid; 367 368 if (!slave) 369 return 0; 370 371 gid = gid_from_req_msg(ibdev, mad); 372 *slave = mlx4_ib_find_real_gid(ibdev, port, gid.global.interface_id); 373 if (*slave < 0) { 374 mlx4_ib_warn(ibdev, "failed matching slave_id by gid (0x%llx)\n", 375 be64_to_cpu(gid.global.interface_id)); 376 return -ENOENT; 377 } 378 return 0; 379 } 380 381 pv_cm_id = get_remote_comm_id(mad); 382 id = id_map_get(ibdev, (int *)&pv_cm_id, -1, -1); 383 384 if (!id) { 385 pr_debug("Couldn't find an entry for pv_cm_id 0x%x\n", pv_cm_id); 386 return -ENOENT; 387 } 388 389 if (slave) 390 *slave = id->slave_id; 391 set_remote_comm_id(mad, id->sl_cm_id); 392 393 if (mad->mad_hdr.attr_id == CM_DREQ_ATTR_ID) 394 schedule_delayed(ibdev, id); 395 else if (mad->mad_hdr.attr_id == CM_REJ_ATTR_ID || 396 mad->mad_hdr.attr_id == CM_DREP_ATTR_ID) { 397 id_map_find_del(ibdev, (int) pv_cm_id); 398 } 399 400 return 0; 401 } 402 403 void mlx4_ib_cm_paravirt_init(struct mlx4_ib_dev *dev) 404 { 405 spin_lock_init(&dev->sriov.id_map_lock); 406 INIT_LIST_HEAD(&dev->sriov.cm_list); 407 dev->sriov.sl_id_map = RB_ROOT; 408 idr_init(&dev->sriov.pv_id_table); 409 } 410 411 /* slave = -1 ==> all slaves */ 412 /* TBD -- call paravirt clean for single slave. Need for slave RESET event */ 413 void mlx4_ib_cm_paravirt_clean(struct mlx4_ib_dev *dev, int slave) 414 { 415 struct mlx4_ib_sriov *sriov = &dev->sriov; 416 struct rb_root *sl_id_map = &sriov->sl_id_map; 417 struct list_head lh; 418 struct rb_node *nd; 419 int need_flush = 1; 420 struct id_map_entry *map, *tmp_map; 421 /* cancel all delayed work queue entries */ 422 INIT_LIST_HEAD(&lh); 423 spin_lock(&sriov->id_map_lock); 424 list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) { 425 if (slave < 0 || slave == map->slave_id) { 426 if (map->scheduled_delete) 427 need_flush &= !!cancel_delayed_work(&map->timeout); 428 } 429 } 430 431 spin_unlock(&sriov->id_map_lock); 432 433 if (!need_flush) 434 flush_scheduled_work(); /* make sure all timers were flushed */ 435 436 /* now, remove all leftover entries from databases*/ 437 spin_lock(&sriov->id_map_lock); 438 if (slave < 0) { 439 while (rb_first(sl_id_map)) { 440 struct id_map_entry *ent = 441 rb_entry(rb_first(sl_id_map), 442 struct id_map_entry, node); 443 444 rb_erase(&ent->node, sl_id_map); 445 idr_remove(&sriov->pv_id_table, (int) ent->pv_cm_id); 446 } 447 list_splice_init(&dev->sriov.cm_list, &lh); 448 } else { 449 /* first, move nodes belonging to slave to db remove list */ 450 nd = rb_first(sl_id_map); 451 while (nd) { 452 struct id_map_entry *ent = 453 rb_entry(nd, struct id_map_entry, node); 454 nd = rb_next(nd); 455 if (ent->slave_id == slave) 456 list_move_tail(&ent->list, &lh); 457 } 458 /* remove those nodes from databases */ 459 list_for_each_entry_safe(map, tmp_map, &lh, list) { 460 rb_erase(&map->node, sl_id_map); 461 idr_remove(&sriov->pv_id_table, (int) map->pv_cm_id); 462 } 463 464 /* add remaining nodes from cm_list */ 465 list_for_each_entry_safe(map, tmp_map, &dev->sriov.cm_list, list) { 466 if (slave == map->slave_id) 467 list_move_tail(&map->list, &lh); 468 } 469 } 470 471 spin_unlock(&sriov->id_map_lock); 472 473 /* free any map entries left behind due to cancel_delayed_work above */ 474 list_for_each_entry_safe(map, tmp_map, &lh, list) { 475 list_del(&map->list); 476 kfree(map); 477 } 478 } 479