1 /* 2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36 #include <linux/completion.h> 37 #include <linux/dma-mapping.h> 38 #include <linux/device.h> 39 #include <linux/module.h> 40 #include <linux/err.h> 41 #include <linux/idr.h> 42 #include <linux/interrupt.h> 43 #include <linux/random.h> 44 #include <linux/rbtree.h> 45 #include <linux/spinlock.h> 46 #include <linux/slab.h> 47 #include <linux/sysfs.h> 48 #include <linux/workqueue.h> 49 #include <linux/kdev_t.h> 50 #include <linux/etherdevice.h> 51 52 #include <rdma/ib_cache.h> 53 #include <rdma/ib_cm.h> 54 #include "cm_msgs.h" 55 56 MODULE_AUTHOR("Sean Hefty"); 57 MODULE_DESCRIPTION("InfiniBand CM"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 60 static void cm_add_one(struct ib_device *device); 61 static void cm_remove_one(struct ib_device *device, void *client_data); 62 63 static struct ib_client cm_client = { 64 .name = "cm", 65 .add = cm_add_one, 66 .remove = cm_remove_one 67 }; 68 69 static struct ib_cm { 70 spinlock_t lock; 71 struct list_head device_list; 72 rwlock_t device_lock; 73 struct rb_root listen_service_table; 74 u64 listen_service_id; 75 /* struct rb_root peer_service_table; todo: fix peer to peer */ 76 struct rb_root remote_qp_table; 77 struct rb_root remote_id_table; 78 struct rb_root remote_sidr_table; 79 struct idr local_id_table; 80 __be32 random_id_operand; 81 struct list_head timewait_list; 82 struct workqueue_struct *wq; 83 } cm; 84 85 /* Counter indexes ordered by attribute ID */ 86 enum { 87 CM_REQ_COUNTER, 88 CM_MRA_COUNTER, 89 CM_REJ_COUNTER, 90 CM_REP_COUNTER, 91 CM_RTU_COUNTER, 92 CM_DREQ_COUNTER, 93 CM_DREP_COUNTER, 94 CM_SIDR_REQ_COUNTER, 95 CM_SIDR_REP_COUNTER, 96 CM_LAP_COUNTER, 97 CM_APR_COUNTER, 98 CM_ATTR_COUNT, 99 CM_ATTR_ID_OFFSET = 0x0010, 100 }; 101 102 enum { 103 CM_XMIT, 104 CM_XMIT_RETRIES, 105 CM_RECV, 106 CM_RECV_DUPLICATES, 107 CM_COUNTER_GROUPS 108 }; 109 110 static char const counter_group_names[CM_COUNTER_GROUPS] 111 [sizeof("cm_rx_duplicates")] = { 112 "cm_tx_msgs", "cm_tx_retries", 113 "cm_rx_msgs", "cm_rx_duplicates" 114 }; 115 116 struct cm_counter_group { 117 struct kobject obj; 118 atomic_long_t counter[CM_ATTR_COUNT]; 119 }; 120 121 struct cm_counter_attribute { 122 struct attribute attr; 123 int index; 124 }; 125 126 #define CM_COUNTER_ATTR(_name, _index) \ 127 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 128 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 129 .index = _index \ 130 } 131 132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 143 144 static struct attribute *cm_counter_default_attrs[] = { 145 &cm_req_counter_attr.attr, 146 &cm_mra_counter_attr.attr, 147 &cm_rej_counter_attr.attr, 148 &cm_rep_counter_attr.attr, 149 &cm_rtu_counter_attr.attr, 150 &cm_dreq_counter_attr.attr, 151 &cm_drep_counter_attr.attr, 152 &cm_sidr_req_counter_attr.attr, 153 &cm_sidr_rep_counter_attr.attr, 154 &cm_lap_counter_attr.attr, 155 &cm_apr_counter_attr.attr, 156 NULL 157 }; 158 159 struct cm_port { 160 struct cm_device *cm_dev; 161 struct ib_mad_agent *mad_agent; 162 struct kobject port_obj; 163 u8 port_num; 164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 165 }; 166 167 struct cm_device { 168 struct list_head list; 169 struct ib_device *ib_device; 170 struct device *device; 171 u8 ack_delay; 172 int going_down; 173 struct cm_port *port[0]; 174 }; 175 176 struct cm_av { 177 struct cm_port *port; 178 union ib_gid dgid; 179 struct ib_ah_attr ah_attr; 180 u16 pkey_index; 181 u8 timeout; 182 }; 183 184 struct cm_work { 185 struct delayed_work work; 186 struct list_head list; 187 struct cm_port *port; 188 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 189 __be32 local_id; /* Established / timewait */ 190 __be32 remote_id; 191 struct ib_cm_event cm_event; 192 struct ib_sa_path_rec path[0]; 193 }; 194 195 struct cm_timewait_info { 196 struct cm_work work; /* Must be first. */ 197 struct list_head list; 198 struct rb_node remote_qp_node; 199 struct rb_node remote_id_node; 200 __be64 remote_ca_guid; 201 __be32 remote_qpn; 202 u8 inserted_remote_qp; 203 u8 inserted_remote_id; 204 }; 205 206 struct cm_id_private { 207 struct ib_cm_id id; 208 209 struct rb_node service_node; 210 struct rb_node sidr_id_node; 211 spinlock_t lock; /* Do not acquire inside cm.lock */ 212 struct completion comp; 213 atomic_t refcount; 214 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 215 * Protected by the cm.lock spinlock. */ 216 int listen_sharecount; 217 218 struct ib_mad_send_buf *msg; 219 struct cm_timewait_info *timewait_info; 220 /* todo: use alternate port on send failure */ 221 struct cm_av av; 222 struct cm_av alt_av; 223 224 void *private_data; 225 __be64 tid; 226 __be32 local_qpn; 227 __be32 remote_qpn; 228 enum ib_qp_type qp_type; 229 __be32 sq_psn; 230 __be32 rq_psn; 231 int timeout_ms; 232 enum ib_mtu path_mtu; 233 __be16 pkey; 234 u8 private_data_len; 235 u8 max_cm_retries; 236 u8 peer_to_peer; 237 u8 responder_resources; 238 u8 initiator_depth; 239 u8 retry_count; 240 u8 rnr_retry_count; 241 u8 service_timeout; 242 u8 target_ack_delay; 243 244 struct list_head work_list; 245 atomic_t work_count; 246 }; 247 248 static void cm_work_handler(struct work_struct *work); 249 250 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 251 { 252 if (atomic_dec_and_test(&cm_id_priv->refcount)) 253 complete(&cm_id_priv->comp); 254 } 255 256 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 257 struct ib_mad_send_buf **msg) 258 { 259 struct ib_mad_agent *mad_agent; 260 struct ib_mad_send_buf *m; 261 struct ib_ah *ah; 262 263 mad_agent = cm_id_priv->av.port->mad_agent; 264 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 265 if (IS_ERR(ah)) 266 return PTR_ERR(ah); 267 268 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 269 cm_id_priv->av.pkey_index, 270 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 271 GFP_ATOMIC, 272 IB_MGMT_BASE_VERSION); 273 if (IS_ERR(m)) { 274 ib_destroy_ah(ah); 275 return PTR_ERR(m); 276 } 277 278 /* Timeout set by caller if response is expected. */ 279 m->ah = ah; 280 m->retries = cm_id_priv->max_cm_retries; 281 282 atomic_inc(&cm_id_priv->refcount); 283 m->context[0] = cm_id_priv; 284 *msg = m; 285 return 0; 286 } 287 288 static int cm_alloc_response_msg(struct cm_port *port, 289 struct ib_mad_recv_wc *mad_recv_wc, 290 struct ib_mad_send_buf **msg) 291 { 292 struct ib_mad_send_buf *m; 293 struct ib_ah *ah; 294 295 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 296 mad_recv_wc->recv_buf.grh, port->port_num); 297 if (IS_ERR(ah)) 298 return PTR_ERR(ah); 299 300 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 302 GFP_ATOMIC, 303 IB_MGMT_BASE_VERSION); 304 if (IS_ERR(m)) { 305 ib_destroy_ah(ah); 306 return PTR_ERR(m); 307 } 308 m->ah = ah; 309 *msg = m; 310 return 0; 311 } 312 313 static void cm_free_msg(struct ib_mad_send_buf *msg) 314 { 315 ib_destroy_ah(msg->ah); 316 if (msg->context[0]) 317 cm_deref_id(msg->context[0]); 318 ib_free_send_mad(msg); 319 } 320 321 static void * cm_copy_private_data(const void *private_data, 322 u8 private_data_len) 323 { 324 void *data; 325 326 if (!private_data || !private_data_len) 327 return NULL; 328 329 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 330 if (!data) 331 return ERR_PTR(-ENOMEM); 332 333 return data; 334 } 335 336 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 337 void *private_data, u8 private_data_len) 338 { 339 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 340 kfree(cm_id_priv->private_data); 341 342 cm_id_priv->private_data = private_data; 343 cm_id_priv->private_data_len = private_data_len; 344 } 345 346 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 347 struct ib_grh *grh, struct cm_av *av) 348 { 349 av->port = port; 350 av->pkey_index = wc->pkey_index; 351 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 352 grh, &av->ah_attr); 353 } 354 355 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 356 { 357 struct cm_device *cm_dev; 358 struct cm_port *port = NULL; 359 unsigned long flags; 360 int ret; 361 u8 p; 362 struct net_device *ndev = ib_get_ndev_from_path(path); 363 364 read_lock_irqsave(&cm.device_lock, flags); 365 list_for_each_entry(cm_dev, &cm.device_list, list) { 366 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 367 path->gid_type, ndev, &p, NULL)) { 368 port = cm_dev->port[p-1]; 369 break; 370 } 371 } 372 read_unlock_irqrestore(&cm.device_lock, flags); 373 374 if (ndev) 375 dev_put(ndev); 376 377 if (!port) 378 return -EINVAL; 379 380 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 381 be16_to_cpu(path->pkey), &av->pkey_index); 382 if (ret) 383 return ret; 384 385 av->port = port; 386 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 387 &av->ah_attr); 388 av->timeout = path->packet_life_time + 1; 389 390 return 0; 391 } 392 393 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 394 { 395 unsigned long flags; 396 int id; 397 398 idr_preload(GFP_KERNEL); 399 spin_lock_irqsave(&cm.lock, flags); 400 401 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 402 403 spin_unlock_irqrestore(&cm.lock, flags); 404 idr_preload_end(); 405 406 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 407 return id < 0 ? id : 0; 408 } 409 410 static void cm_free_id(__be32 local_id) 411 { 412 spin_lock_irq(&cm.lock); 413 idr_remove(&cm.local_id_table, 414 (__force int) (local_id ^ cm.random_id_operand)); 415 spin_unlock_irq(&cm.lock); 416 } 417 418 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 419 { 420 struct cm_id_private *cm_id_priv; 421 422 cm_id_priv = idr_find(&cm.local_id_table, 423 (__force int) (local_id ^ cm.random_id_operand)); 424 if (cm_id_priv) { 425 if (cm_id_priv->id.remote_id == remote_id) 426 atomic_inc(&cm_id_priv->refcount); 427 else 428 cm_id_priv = NULL; 429 } 430 431 return cm_id_priv; 432 } 433 434 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 435 { 436 struct cm_id_private *cm_id_priv; 437 438 spin_lock_irq(&cm.lock); 439 cm_id_priv = cm_get_id(local_id, remote_id); 440 spin_unlock_irq(&cm.lock); 441 442 return cm_id_priv; 443 } 444 445 /* 446 * Trivial helpers to strip endian annotation and compare; the 447 * endianness doesn't actually matter since we just need a stable 448 * order for the RB tree. 449 */ 450 static int be32_lt(__be32 a, __be32 b) 451 { 452 return (__force u32) a < (__force u32) b; 453 } 454 455 static int be32_gt(__be32 a, __be32 b) 456 { 457 return (__force u32) a > (__force u32) b; 458 } 459 460 static int be64_lt(__be64 a, __be64 b) 461 { 462 return (__force u64) a < (__force u64) b; 463 } 464 465 static int be64_gt(__be64 a, __be64 b) 466 { 467 return (__force u64) a > (__force u64) b; 468 } 469 470 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 471 { 472 struct rb_node **link = &cm.listen_service_table.rb_node; 473 struct rb_node *parent = NULL; 474 struct cm_id_private *cur_cm_id_priv; 475 __be64 service_id = cm_id_priv->id.service_id; 476 __be64 service_mask = cm_id_priv->id.service_mask; 477 478 while (*link) { 479 parent = *link; 480 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 481 service_node); 482 if ((cur_cm_id_priv->id.service_mask & service_id) == 483 (service_mask & cur_cm_id_priv->id.service_id) && 484 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 485 return cur_cm_id_priv; 486 487 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 488 link = &(*link)->rb_left; 489 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 490 link = &(*link)->rb_right; 491 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 492 link = &(*link)->rb_left; 493 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 494 link = &(*link)->rb_right; 495 else 496 link = &(*link)->rb_right; 497 } 498 rb_link_node(&cm_id_priv->service_node, parent, link); 499 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 500 return NULL; 501 } 502 503 static struct cm_id_private * cm_find_listen(struct ib_device *device, 504 __be64 service_id) 505 { 506 struct rb_node *node = cm.listen_service_table.rb_node; 507 struct cm_id_private *cm_id_priv; 508 509 while (node) { 510 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 511 if ((cm_id_priv->id.service_mask & service_id) == 512 cm_id_priv->id.service_id && 513 (cm_id_priv->id.device == device)) 514 return cm_id_priv; 515 516 if (device < cm_id_priv->id.device) 517 node = node->rb_left; 518 else if (device > cm_id_priv->id.device) 519 node = node->rb_right; 520 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 521 node = node->rb_left; 522 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 523 node = node->rb_right; 524 else 525 node = node->rb_right; 526 } 527 return NULL; 528 } 529 530 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 531 *timewait_info) 532 { 533 struct rb_node **link = &cm.remote_id_table.rb_node; 534 struct rb_node *parent = NULL; 535 struct cm_timewait_info *cur_timewait_info; 536 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 537 __be32 remote_id = timewait_info->work.remote_id; 538 539 while (*link) { 540 parent = *link; 541 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 542 remote_id_node); 543 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 544 link = &(*link)->rb_left; 545 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 546 link = &(*link)->rb_right; 547 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 548 link = &(*link)->rb_left; 549 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 550 link = &(*link)->rb_right; 551 else 552 return cur_timewait_info; 553 } 554 timewait_info->inserted_remote_id = 1; 555 rb_link_node(&timewait_info->remote_id_node, parent, link); 556 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 557 return NULL; 558 } 559 560 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 561 __be32 remote_id) 562 { 563 struct rb_node *node = cm.remote_id_table.rb_node; 564 struct cm_timewait_info *timewait_info; 565 566 while (node) { 567 timewait_info = rb_entry(node, struct cm_timewait_info, 568 remote_id_node); 569 if (be32_lt(remote_id, timewait_info->work.remote_id)) 570 node = node->rb_left; 571 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 572 node = node->rb_right; 573 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 574 node = node->rb_left; 575 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 576 node = node->rb_right; 577 else 578 return timewait_info; 579 } 580 return NULL; 581 } 582 583 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 584 *timewait_info) 585 { 586 struct rb_node **link = &cm.remote_qp_table.rb_node; 587 struct rb_node *parent = NULL; 588 struct cm_timewait_info *cur_timewait_info; 589 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 590 __be32 remote_qpn = timewait_info->remote_qpn; 591 592 while (*link) { 593 parent = *link; 594 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 595 remote_qp_node); 596 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 597 link = &(*link)->rb_left; 598 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 599 link = &(*link)->rb_right; 600 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 601 link = &(*link)->rb_left; 602 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 603 link = &(*link)->rb_right; 604 else 605 return cur_timewait_info; 606 } 607 timewait_info->inserted_remote_qp = 1; 608 rb_link_node(&timewait_info->remote_qp_node, parent, link); 609 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 610 return NULL; 611 } 612 613 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 614 *cm_id_priv) 615 { 616 struct rb_node **link = &cm.remote_sidr_table.rb_node; 617 struct rb_node *parent = NULL; 618 struct cm_id_private *cur_cm_id_priv; 619 union ib_gid *port_gid = &cm_id_priv->av.dgid; 620 __be32 remote_id = cm_id_priv->id.remote_id; 621 622 while (*link) { 623 parent = *link; 624 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 625 sidr_id_node); 626 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 627 link = &(*link)->rb_left; 628 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 629 link = &(*link)->rb_right; 630 else { 631 int cmp; 632 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 633 sizeof *port_gid); 634 if (cmp < 0) 635 link = &(*link)->rb_left; 636 else if (cmp > 0) 637 link = &(*link)->rb_right; 638 else 639 return cur_cm_id_priv; 640 } 641 } 642 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 643 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 644 return NULL; 645 } 646 647 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 648 enum ib_cm_sidr_status status) 649 { 650 struct ib_cm_sidr_rep_param param; 651 652 memset(¶m, 0, sizeof param); 653 param.status = status; 654 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 655 } 656 657 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 658 ib_cm_handler cm_handler, 659 void *context) 660 { 661 struct cm_id_private *cm_id_priv; 662 int ret; 663 664 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 665 if (!cm_id_priv) 666 return ERR_PTR(-ENOMEM); 667 668 cm_id_priv->id.state = IB_CM_IDLE; 669 cm_id_priv->id.device = device; 670 cm_id_priv->id.cm_handler = cm_handler; 671 cm_id_priv->id.context = context; 672 cm_id_priv->id.remote_cm_qpn = 1; 673 ret = cm_alloc_id(cm_id_priv); 674 if (ret) 675 goto error; 676 677 spin_lock_init(&cm_id_priv->lock); 678 init_completion(&cm_id_priv->comp); 679 INIT_LIST_HEAD(&cm_id_priv->work_list); 680 atomic_set(&cm_id_priv->work_count, -1); 681 atomic_set(&cm_id_priv->refcount, 1); 682 return &cm_id_priv->id; 683 684 error: 685 kfree(cm_id_priv); 686 return ERR_PTR(-ENOMEM); 687 } 688 EXPORT_SYMBOL(ib_create_cm_id); 689 690 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 691 { 692 struct cm_work *work; 693 694 if (list_empty(&cm_id_priv->work_list)) 695 return NULL; 696 697 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 698 list_del(&work->list); 699 return work; 700 } 701 702 static void cm_free_work(struct cm_work *work) 703 { 704 if (work->mad_recv_wc) 705 ib_free_recv_mad(work->mad_recv_wc); 706 kfree(work); 707 } 708 709 static inline int cm_convert_to_ms(int iba_time) 710 { 711 /* approximate conversion to ms from 4.096us x 2^iba_time */ 712 return 1 << max(iba_time - 8, 0); 713 } 714 715 /* 716 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 717 * Because of how ack_timeout is stored, adding one doubles the timeout. 718 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 719 * increment it (round up) only if the other is within 50%. 720 */ 721 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 722 { 723 int ack_timeout = packet_life_time + 1; 724 725 if (ack_timeout >= ca_ack_delay) 726 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 727 else 728 ack_timeout = ca_ack_delay + 729 (ack_timeout >= (ca_ack_delay - 1)); 730 731 return min(31, ack_timeout); 732 } 733 734 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 735 { 736 if (timewait_info->inserted_remote_id) { 737 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 738 timewait_info->inserted_remote_id = 0; 739 } 740 741 if (timewait_info->inserted_remote_qp) { 742 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 743 timewait_info->inserted_remote_qp = 0; 744 } 745 } 746 747 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 748 { 749 struct cm_timewait_info *timewait_info; 750 751 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 752 if (!timewait_info) 753 return ERR_PTR(-ENOMEM); 754 755 timewait_info->work.local_id = local_id; 756 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 757 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 758 return timewait_info; 759 } 760 761 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 762 { 763 int wait_time; 764 unsigned long flags; 765 struct cm_device *cm_dev; 766 767 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 768 if (!cm_dev) 769 return; 770 771 spin_lock_irqsave(&cm.lock, flags); 772 cm_cleanup_timewait(cm_id_priv->timewait_info); 773 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 774 spin_unlock_irqrestore(&cm.lock, flags); 775 776 /* 777 * The cm_id could be destroyed by the user before we exit timewait. 778 * To protect against this, we search for the cm_id after exiting 779 * timewait before notifying the user that we've exited timewait. 780 */ 781 cm_id_priv->id.state = IB_CM_TIMEWAIT; 782 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 783 784 /* Check if the device started its remove_one */ 785 spin_lock_irqsave(&cm.lock, flags); 786 if (!cm_dev->going_down) 787 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 788 msecs_to_jiffies(wait_time)); 789 spin_unlock_irqrestore(&cm.lock, flags); 790 791 cm_id_priv->timewait_info = NULL; 792 } 793 794 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 795 { 796 unsigned long flags; 797 798 cm_id_priv->id.state = IB_CM_IDLE; 799 if (cm_id_priv->timewait_info) { 800 spin_lock_irqsave(&cm.lock, flags); 801 cm_cleanup_timewait(cm_id_priv->timewait_info); 802 spin_unlock_irqrestore(&cm.lock, flags); 803 kfree(cm_id_priv->timewait_info); 804 cm_id_priv->timewait_info = NULL; 805 } 806 } 807 808 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 809 { 810 struct cm_id_private *cm_id_priv; 811 struct cm_work *work; 812 813 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 814 retest: 815 spin_lock_irq(&cm_id_priv->lock); 816 switch (cm_id->state) { 817 case IB_CM_LISTEN: 818 spin_unlock_irq(&cm_id_priv->lock); 819 820 spin_lock_irq(&cm.lock); 821 if (--cm_id_priv->listen_sharecount > 0) { 822 /* The id is still shared. */ 823 cm_deref_id(cm_id_priv); 824 spin_unlock_irq(&cm.lock); 825 return; 826 } 827 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 828 spin_unlock_irq(&cm.lock); 829 break; 830 case IB_CM_SIDR_REQ_SENT: 831 cm_id->state = IB_CM_IDLE; 832 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 833 spin_unlock_irq(&cm_id_priv->lock); 834 break; 835 case IB_CM_SIDR_REQ_RCVD: 836 spin_unlock_irq(&cm_id_priv->lock); 837 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 838 spin_lock_irq(&cm.lock); 839 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 840 rb_erase(&cm_id_priv->sidr_id_node, 841 &cm.remote_sidr_table); 842 spin_unlock_irq(&cm.lock); 843 break; 844 case IB_CM_REQ_SENT: 845 case IB_CM_MRA_REQ_RCVD: 846 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 847 spin_unlock_irq(&cm_id_priv->lock); 848 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 849 &cm_id_priv->id.device->node_guid, 850 sizeof cm_id_priv->id.device->node_guid, 851 NULL, 0); 852 break; 853 case IB_CM_REQ_RCVD: 854 if (err == -ENOMEM) { 855 /* Do not reject to allow future retries. */ 856 cm_reset_to_idle(cm_id_priv); 857 spin_unlock_irq(&cm_id_priv->lock); 858 } else { 859 spin_unlock_irq(&cm_id_priv->lock); 860 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 861 NULL, 0, NULL, 0); 862 } 863 break; 864 case IB_CM_REP_SENT: 865 case IB_CM_MRA_REP_RCVD: 866 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 867 /* Fall through */ 868 case IB_CM_MRA_REQ_SENT: 869 case IB_CM_REP_RCVD: 870 case IB_CM_MRA_REP_SENT: 871 spin_unlock_irq(&cm_id_priv->lock); 872 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 873 NULL, 0, NULL, 0); 874 break; 875 case IB_CM_ESTABLISHED: 876 spin_unlock_irq(&cm_id_priv->lock); 877 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 878 break; 879 ib_send_cm_dreq(cm_id, NULL, 0); 880 goto retest; 881 case IB_CM_DREQ_SENT: 882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 883 cm_enter_timewait(cm_id_priv); 884 spin_unlock_irq(&cm_id_priv->lock); 885 break; 886 case IB_CM_DREQ_RCVD: 887 spin_unlock_irq(&cm_id_priv->lock); 888 ib_send_cm_drep(cm_id, NULL, 0); 889 break; 890 default: 891 spin_unlock_irq(&cm_id_priv->lock); 892 break; 893 } 894 895 cm_free_id(cm_id->local_id); 896 cm_deref_id(cm_id_priv); 897 wait_for_completion(&cm_id_priv->comp); 898 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 899 cm_free_work(work); 900 kfree(cm_id_priv->private_data); 901 kfree(cm_id_priv); 902 } 903 904 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 905 { 906 cm_destroy_id(cm_id, 0); 907 } 908 EXPORT_SYMBOL(ib_destroy_cm_id); 909 910 /** 911 * __ib_cm_listen - Initiates listening on the specified service ID for 912 * connection and service ID resolution requests. 913 * @cm_id: Connection identifier associated with the listen request. 914 * @service_id: Service identifier matched against incoming connection 915 * and service ID resolution requests. The service ID should be specified 916 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 917 * assign a service ID to the caller. 918 * @service_mask: Mask applied to service ID used to listen across a 919 * range of service IDs. If set to 0, the service ID is matched 920 * exactly. This parameter is ignored if %service_id is set to 921 * IB_CM_ASSIGN_SERVICE_ID. 922 */ 923 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 924 __be64 service_mask) 925 { 926 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 927 int ret = 0; 928 929 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 930 service_id &= service_mask; 931 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 932 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 933 return -EINVAL; 934 935 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 936 if (cm_id->state != IB_CM_IDLE) 937 return -EINVAL; 938 939 cm_id->state = IB_CM_LISTEN; 940 ++cm_id_priv->listen_sharecount; 941 942 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 943 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 944 cm_id->service_mask = ~cpu_to_be64(0); 945 } else { 946 cm_id->service_id = service_id; 947 cm_id->service_mask = service_mask; 948 } 949 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 950 951 if (cur_cm_id_priv) { 952 cm_id->state = IB_CM_IDLE; 953 --cm_id_priv->listen_sharecount; 954 ret = -EBUSY; 955 } 956 return ret; 957 } 958 959 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 960 { 961 unsigned long flags; 962 int ret; 963 964 spin_lock_irqsave(&cm.lock, flags); 965 ret = __ib_cm_listen(cm_id, service_id, service_mask); 966 spin_unlock_irqrestore(&cm.lock, flags); 967 968 return ret; 969 } 970 EXPORT_SYMBOL(ib_cm_listen); 971 972 /** 973 * Create a new listening ib_cm_id and listen on the given service ID. 974 * 975 * If there's an existing ID listening on that same device and service ID, 976 * return it. 977 * 978 * @device: Device associated with the cm_id. All related communication will 979 * be associated with the specified device. 980 * @cm_handler: Callback invoked to notify the user of CM events. 981 * @service_id: Service identifier matched against incoming connection 982 * and service ID resolution requests. The service ID should be specified 983 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 984 * assign a service ID to the caller. 985 * 986 * Callers should call ib_destroy_cm_id when done with the listener ID. 987 */ 988 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 989 ib_cm_handler cm_handler, 990 __be64 service_id) 991 { 992 struct cm_id_private *cm_id_priv; 993 struct ib_cm_id *cm_id; 994 unsigned long flags; 995 int err = 0; 996 997 /* Create an ID in advance, since the creation may sleep */ 998 cm_id = ib_create_cm_id(device, cm_handler, NULL); 999 if (IS_ERR(cm_id)) 1000 return cm_id; 1001 1002 spin_lock_irqsave(&cm.lock, flags); 1003 1004 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1005 goto new_id; 1006 1007 /* Find an existing ID */ 1008 cm_id_priv = cm_find_listen(device, service_id); 1009 if (cm_id_priv) { 1010 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1011 /* Sharing an ib_cm_id with different handlers is not 1012 * supported */ 1013 spin_unlock_irqrestore(&cm.lock, flags); 1014 return ERR_PTR(-EINVAL); 1015 } 1016 atomic_inc(&cm_id_priv->refcount); 1017 ++cm_id_priv->listen_sharecount; 1018 spin_unlock_irqrestore(&cm.lock, flags); 1019 1020 ib_destroy_cm_id(cm_id); 1021 cm_id = &cm_id_priv->id; 1022 return cm_id; 1023 } 1024 1025 new_id: 1026 /* Use newly created ID */ 1027 err = __ib_cm_listen(cm_id, service_id, 0); 1028 1029 spin_unlock_irqrestore(&cm.lock, flags); 1030 1031 if (err) { 1032 ib_destroy_cm_id(cm_id); 1033 return ERR_PTR(err); 1034 } 1035 return cm_id; 1036 } 1037 EXPORT_SYMBOL(ib_cm_insert_listen); 1038 1039 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1040 enum cm_msg_sequence msg_seq) 1041 { 1042 u64 hi_tid, low_tid; 1043 1044 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1045 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1046 (msg_seq << 30)); 1047 return cpu_to_be64(hi_tid | low_tid); 1048 } 1049 1050 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1051 __be16 attr_id, __be64 tid) 1052 { 1053 hdr->base_version = IB_MGMT_BASE_VERSION; 1054 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1055 hdr->class_version = IB_CM_CLASS_VERSION; 1056 hdr->method = IB_MGMT_METHOD_SEND; 1057 hdr->attr_id = attr_id; 1058 hdr->tid = tid; 1059 } 1060 1061 static void cm_format_req(struct cm_req_msg *req_msg, 1062 struct cm_id_private *cm_id_priv, 1063 struct ib_cm_req_param *param) 1064 { 1065 struct ib_sa_path_rec *pri_path = param->primary_path; 1066 struct ib_sa_path_rec *alt_path = param->alternate_path; 1067 1068 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1069 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1070 1071 req_msg->local_comm_id = cm_id_priv->id.local_id; 1072 req_msg->service_id = param->service_id; 1073 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1074 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1075 cm_req_set_init_depth(req_msg, param->initiator_depth); 1076 cm_req_set_remote_resp_timeout(req_msg, 1077 param->remote_cm_response_timeout); 1078 cm_req_set_qp_type(req_msg, param->qp_type); 1079 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1080 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1081 cm_req_set_local_resp_timeout(req_msg, 1082 param->local_cm_response_timeout); 1083 req_msg->pkey = param->primary_path->pkey; 1084 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1085 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1086 1087 if (param->qp_type != IB_QPT_XRC_INI) { 1088 cm_req_set_resp_res(req_msg, param->responder_resources); 1089 cm_req_set_retry_count(req_msg, param->retry_count); 1090 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1091 cm_req_set_srq(req_msg, param->srq); 1092 } 1093 1094 if (pri_path->hop_limit <= 1) { 1095 req_msg->primary_local_lid = pri_path->slid; 1096 req_msg->primary_remote_lid = pri_path->dlid; 1097 } else { 1098 /* Work-around until there's a way to obtain remote LID info */ 1099 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1100 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1101 } 1102 req_msg->primary_local_gid = pri_path->sgid; 1103 req_msg->primary_remote_gid = pri_path->dgid; 1104 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1105 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1106 req_msg->primary_traffic_class = pri_path->traffic_class; 1107 req_msg->primary_hop_limit = pri_path->hop_limit; 1108 cm_req_set_primary_sl(req_msg, pri_path->sl); 1109 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1110 cm_req_set_primary_local_ack_timeout(req_msg, 1111 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1112 pri_path->packet_life_time)); 1113 1114 if (alt_path) { 1115 if (alt_path->hop_limit <= 1) { 1116 req_msg->alt_local_lid = alt_path->slid; 1117 req_msg->alt_remote_lid = alt_path->dlid; 1118 } else { 1119 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1120 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1121 } 1122 req_msg->alt_local_gid = alt_path->sgid; 1123 req_msg->alt_remote_gid = alt_path->dgid; 1124 cm_req_set_alt_flow_label(req_msg, 1125 alt_path->flow_label); 1126 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1127 req_msg->alt_traffic_class = alt_path->traffic_class; 1128 req_msg->alt_hop_limit = alt_path->hop_limit; 1129 cm_req_set_alt_sl(req_msg, alt_path->sl); 1130 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1131 cm_req_set_alt_local_ack_timeout(req_msg, 1132 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1133 alt_path->packet_life_time)); 1134 } 1135 1136 if (param->private_data && param->private_data_len) 1137 memcpy(req_msg->private_data, param->private_data, 1138 param->private_data_len); 1139 } 1140 1141 static int cm_validate_req_param(struct ib_cm_req_param *param) 1142 { 1143 /* peer-to-peer not supported */ 1144 if (param->peer_to_peer) 1145 return -EINVAL; 1146 1147 if (!param->primary_path) 1148 return -EINVAL; 1149 1150 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1151 param->qp_type != IB_QPT_XRC_INI) 1152 return -EINVAL; 1153 1154 if (param->private_data && 1155 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1156 return -EINVAL; 1157 1158 if (param->alternate_path && 1159 (param->alternate_path->pkey != param->primary_path->pkey || 1160 param->alternate_path->mtu != param->primary_path->mtu)) 1161 return -EINVAL; 1162 1163 return 0; 1164 } 1165 1166 int ib_send_cm_req(struct ib_cm_id *cm_id, 1167 struct ib_cm_req_param *param) 1168 { 1169 struct cm_id_private *cm_id_priv; 1170 struct cm_req_msg *req_msg; 1171 unsigned long flags; 1172 int ret; 1173 1174 ret = cm_validate_req_param(param); 1175 if (ret) 1176 return ret; 1177 1178 /* Verify that we're not in timewait. */ 1179 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1180 spin_lock_irqsave(&cm_id_priv->lock, flags); 1181 if (cm_id->state != IB_CM_IDLE) { 1182 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1183 ret = -EINVAL; 1184 goto out; 1185 } 1186 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1187 1188 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1189 id.local_id); 1190 if (IS_ERR(cm_id_priv->timewait_info)) { 1191 ret = PTR_ERR(cm_id_priv->timewait_info); 1192 goto out; 1193 } 1194 1195 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1196 if (ret) 1197 goto error1; 1198 if (param->alternate_path) { 1199 ret = cm_init_av_by_path(param->alternate_path, 1200 &cm_id_priv->alt_av); 1201 if (ret) 1202 goto error1; 1203 } 1204 cm_id->service_id = param->service_id; 1205 cm_id->service_mask = ~cpu_to_be64(0); 1206 cm_id_priv->timeout_ms = cm_convert_to_ms( 1207 param->primary_path->packet_life_time) * 2 + 1208 cm_convert_to_ms( 1209 param->remote_cm_response_timeout); 1210 cm_id_priv->max_cm_retries = param->max_cm_retries; 1211 cm_id_priv->initiator_depth = param->initiator_depth; 1212 cm_id_priv->responder_resources = param->responder_resources; 1213 cm_id_priv->retry_count = param->retry_count; 1214 cm_id_priv->path_mtu = param->primary_path->mtu; 1215 cm_id_priv->pkey = param->primary_path->pkey; 1216 cm_id_priv->qp_type = param->qp_type; 1217 1218 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1219 if (ret) 1220 goto error1; 1221 1222 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1223 cm_format_req(req_msg, cm_id_priv, param); 1224 cm_id_priv->tid = req_msg->hdr.tid; 1225 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1226 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1227 1228 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1229 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1230 1231 spin_lock_irqsave(&cm_id_priv->lock, flags); 1232 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1233 if (ret) { 1234 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1235 goto error2; 1236 } 1237 BUG_ON(cm_id->state != IB_CM_IDLE); 1238 cm_id->state = IB_CM_REQ_SENT; 1239 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1240 return 0; 1241 1242 error2: cm_free_msg(cm_id_priv->msg); 1243 error1: kfree(cm_id_priv->timewait_info); 1244 out: return ret; 1245 } 1246 EXPORT_SYMBOL(ib_send_cm_req); 1247 1248 static int cm_issue_rej(struct cm_port *port, 1249 struct ib_mad_recv_wc *mad_recv_wc, 1250 enum ib_cm_rej_reason reason, 1251 enum cm_msg_response msg_rejected, 1252 void *ari, u8 ari_length) 1253 { 1254 struct ib_mad_send_buf *msg = NULL; 1255 struct cm_rej_msg *rej_msg, *rcv_msg; 1256 int ret; 1257 1258 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1259 if (ret) 1260 return ret; 1261 1262 /* We just need common CM header information. Cast to any message. */ 1263 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1264 rej_msg = (struct cm_rej_msg *) msg->mad; 1265 1266 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1267 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1268 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1269 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1270 rej_msg->reason = cpu_to_be16(reason); 1271 1272 if (ari && ari_length) { 1273 cm_rej_set_reject_info_len(rej_msg, ari_length); 1274 memcpy(rej_msg->ari, ari, ari_length); 1275 } 1276 1277 ret = ib_post_send_mad(msg, NULL); 1278 if (ret) 1279 cm_free_msg(msg); 1280 1281 return ret; 1282 } 1283 1284 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1285 __be32 local_qpn, __be32 remote_qpn) 1286 { 1287 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1288 ((local_ca_guid == remote_ca_guid) && 1289 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1290 } 1291 1292 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1293 struct ib_sa_path_rec *primary_path, 1294 struct ib_sa_path_rec *alt_path) 1295 { 1296 memset(primary_path, 0, sizeof *primary_path); 1297 primary_path->dgid = req_msg->primary_local_gid; 1298 primary_path->sgid = req_msg->primary_remote_gid; 1299 primary_path->dlid = req_msg->primary_local_lid; 1300 primary_path->slid = req_msg->primary_remote_lid; 1301 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1302 primary_path->hop_limit = req_msg->primary_hop_limit; 1303 primary_path->traffic_class = req_msg->primary_traffic_class; 1304 primary_path->reversible = 1; 1305 primary_path->pkey = req_msg->pkey; 1306 primary_path->sl = cm_req_get_primary_sl(req_msg); 1307 primary_path->mtu_selector = IB_SA_EQ; 1308 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1309 primary_path->rate_selector = IB_SA_EQ; 1310 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1311 primary_path->packet_life_time_selector = IB_SA_EQ; 1312 primary_path->packet_life_time = 1313 cm_req_get_primary_local_ack_timeout(req_msg); 1314 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1315 primary_path->service_id = req_msg->service_id; 1316 1317 if (req_msg->alt_local_lid) { 1318 memset(alt_path, 0, sizeof *alt_path); 1319 alt_path->dgid = req_msg->alt_local_gid; 1320 alt_path->sgid = req_msg->alt_remote_gid; 1321 alt_path->dlid = req_msg->alt_local_lid; 1322 alt_path->slid = req_msg->alt_remote_lid; 1323 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1324 alt_path->hop_limit = req_msg->alt_hop_limit; 1325 alt_path->traffic_class = req_msg->alt_traffic_class; 1326 alt_path->reversible = 1; 1327 alt_path->pkey = req_msg->pkey; 1328 alt_path->sl = cm_req_get_alt_sl(req_msg); 1329 alt_path->mtu_selector = IB_SA_EQ; 1330 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1331 alt_path->rate_selector = IB_SA_EQ; 1332 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1333 alt_path->packet_life_time_selector = IB_SA_EQ; 1334 alt_path->packet_life_time = 1335 cm_req_get_alt_local_ack_timeout(req_msg); 1336 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1337 alt_path->service_id = req_msg->service_id; 1338 } 1339 } 1340 1341 static u16 cm_get_bth_pkey(struct cm_work *work) 1342 { 1343 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1344 u8 port_num = work->port->port_num; 1345 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1346 u16 pkey; 1347 int ret; 1348 1349 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1350 if (ret) { 1351 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1352 port_num, pkey_index, ret); 1353 return 0; 1354 } 1355 1356 return pkey; 1357 } 1358 1359 static void cm_format_req_event(struct cm_work *work, 1360 struct cm_id_private *cm_id_priv, 1361 struct ib_cm_id *listen_id) 1362 { 1363 struct cm_req_msg *req_msg; 1364 struct ib_cm_req_event_param *param; 1365 1366 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1367 param = &work->cm_event.param.req_rcvd; 1368 param->listen_id = listen_id; 1369 param->bth_pkey = cm_get_bth_pkey(work); 1370 param->port = cm_id_priv->av.port->port_num; 1371 param->primary_path = &work->path[0]; 1372 if (req_msg->alt_local_lid) 1373 param->alternate_path = &work->path[1]; 1374 else 1375 param->alternate_path = NULL; 1376 param->remote_ca_guid = req_msg->local_ca_guid; 1377 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1378 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1379 param->qp_type = cm_req_get_qp_type(req_msg); 1380 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1381 param->responder_resources = cm_req_get_init_depth(req_msg); 1382 param->initiator_depth = cm_req_get_resp_res(req_msg); 1383 param->local_cm_response_timeout = 1384 cm_req_get_remote_resp_timeout(req_msg); 1385 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1386 param->remote_cm_response_timeout = 1387 cm_req_get_local_resp_timeout(req_msg); 1388 param->retry_count = cm_req_get_retry_count(req_msg); 1389 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1390 param->srq = cm_req_get_srq(req_msg); 1391 work->cm_event.private_data = &req_msg->private_data; 1392 } 1393 1394 static void cm_process_work(struct cm_id_private *cm_id_priv, 1395 struct cm_work *work) 1396 { 1397 int ret; 1398 1399 /* We will typically only have the current event to report. */ 1400 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1401 cm_free_work(work); 1402 1403 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1404 spin_lock_irq(&cm_id_priv->lock); 1405 work = cm_dequeue_work(cm_id_priv); 1406 spin_unlock_irq(&cm_id_priv->lock); 1407 BUG_ON(!work); 1408 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1409 &work->cm_event); 1410 cm_free_work(work); 1411 } 1412 cm_deref_id(cm_id_priv); 1413 if (ret) 1414 cm_destroy_id(&cm_id_priv->id, ret); 1415 } 1416 1417 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1418 struct cm_id_private *cm_id_priv, 1419 enum cm_msg_response msg_mraed, u8 service_timeout, 1420 const void *private_data, u8 private_data_len) 1421 { 1422 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1423 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1424 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1425 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1426 cm_mra_set_service_timeout(mra_msg, service_timeout); 1427 1428 if (private_data && private_data_len) 1429 memcpy(mra_msg->private_data, private_data, private_data_len); 1430 } 1431 1432 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1433 struct cm_id_private *cm_id_priv, 1434 enum ib_cm_rej_reason reason, 1435 void *ari, 1436 u8 ari_length, 1437 const void *private_data, 1438 u8 private_data_len) 1439 { 1440 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1441 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1442 1443 switch(cm_id_priv->id.state) { 1444 case IB_CM_REQ_RCVD: 1445 rej_msg->local_comm_id = 0; 1446 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1447 break; 1448 case IB_CM_MRA_REQ_SENT: 1449 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1450 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1451 break; 1452 case IB_CM_REP_RCVD: 1453 case IB_CM_MRA_REP_SENT: 1454 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1455 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1456 break; 1457 default: 1458 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1459 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1460 break; 1461 } 1462 1463 rej_msg->reason = cpu_to_be16(reason); 1464 if (ari && ari_length) { 1465 cm_rej_set_reject_info_len(rej_msg, ari_length); 1466 memcpy(rej_msg->ari, ari, ari_length); 1467 } 1468 1469 if (private_data && private_data_len) 1470 memcpy(rej_msg->private_data, private_data, private_data_len); 1471 } 1472 1473 static void cm_dup_req_handler(struct cm_work *work, 1474 struct cm_id_private *cm_id_priv) 1475 { 1476 struct ib_mad_send_buf *msg = NULL; 1477 int ret; 1478 1479 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1480 counter[CM_REQ_COUNTER]); 1481 1482 /* Quick state check to discard duplicate REQs. */ 1483 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1484 return; 1485 1486 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1487 if (ret) 1488 return; 1489 1490 spin_lock_irq(&cm_id_priv->lock); 1491 switch (cm_id_priv->id.state) { 1492 case IB_CM_MRA_REQ_SENT: 1493 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1494 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1495 cm_id_priv->private_data, 1496 cm_id_priv->private_data_len); 1497 break; 1498 case IB_CM_TIMEWAIT: 1499 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1500 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1501 break; 1502 default: 1503 goto unlock; 1504 } 1505 spin_unlock_irq(&cm_id_priv->lock); 1506 1507 ret = ib_post_send_mad(msg, NULL); 1508 if (ret) 1509 goto free; 1510 return; 1511 1512 unlock: spin_unlock_irq(&cm_id_priv->lock); 1513 free: cm_free_msg(msg); 1514 } 1515 1516 static struct cm_id_private * cm_match_req(struct cm_work *work, 1517 struct cm_id_private *cm_id_priv) 1518 { 1519 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1520 struct cm_timewait_info *timewait_info; 1521 struct cm_req_msg *req_msg; 1522 1523 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1524 1525 /* Check for possible duplicate REQ. */ 1526 spin_lock_irq(&cm.lock); 1527 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1528 if (timewait_info) { 1529 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1530 timewait_info->work.remote_id); 1531 spin_unlock_irq(&cm.lock); 1532 if (cur_cm_id_priv) { 1533 cm_dup_req_handler(work, cur_cm_id_priv); 1534 cm_deref_id(cur_cm_id_priv); 1535 } 1536 return NULL; 1537 } 1538 1539 /* Check for stale connections. */ 1540 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1541 if (timewait_info) { 1542 cm_cleanup_timewait(cm_id_priv->timewait_info); 1543 spin_unlock_irq(&cm.lock); 1544 cm_issue_rej(work->port, work->mad_recv_wc, 1545 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1546 NULL, 0); 1547 return NULL; 1548 } 1549 1550 /* Find matching listen request. */ 1551 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1552 req_msg->service_id); 1553 if (!listen_cm_id_priv) { 1554 cm_cleanup_timewait(cm_id_priv->timewait_info); 1555 spin_unlock_irq(&cm.lock); 1556 cm_issue_rej(work->port, work->mad_recv_wc, 1557 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1558 NULL, 0); 1559 goto out; 1560 } 1561 atomic_inc(&listen_cm_id_priv->refcount); 1562 atomic_inc(&cm_id_priv->refcount); 1563 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1564 atomic_inc(&cm_id_priv->work_count); 1565 spin_unlock_irq(&cm.lock); 1566 out: 1567 return listen_cm_id_priv; 1568 } 1569 1570 /* 1571 * Work-around for inter-subnet connections. If the LIDs are permissive, 1572 * we need to override the LID/SL data in the REQ with the LID information 1573 * in the work completion. 1574 */ 1575 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1576 { 1577 if (!cm_req_get_primary_subnet_local(req_msg)) { 1578 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1579 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1580 cm_req_set_primary_sl(req_msg, wc->sl); 1581 } 1582 1583 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1584 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1585 } 1586 1587 if (!cm_req_get_alt_subnet_local(req_msg)) { 1588 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1589 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1590 cm_req_set_alt_sl(req_msg, wc->sl); 1591 } 1592 1593 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1594 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1595 } 1596 } 1597 1598 static int cm_req_handler(struct cm_work *work) 1599 { 1600 struct ib_cm_id *cm_id; 1601 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1602 struct cm_req_msg *req_msg; 1603 union ib_gid gid; 1604 struct ib_gid_attr gid_attr; 1605 int ret; 1606 1607 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1608 1609 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1610 if (IS_ERR(cm_id)) 1611 return PTR_ERR(cm_id); 1612 1613 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1614 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1615 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1616 work->mad_recv_wc->recv_buf.grh, 1617 &cm_id_priv->av); 1618 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1619 id.local_id); 1620 if (IS_ERR(cm_id_priv->timewait_info)) { 1621 ret = PTR_ERR(cm_id_priv->timewait_info); 1622 goto destroy; 1623 } 1624 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1625 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1626 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1627 1628 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1629 if (!listen_cm_id_priv) { 1630 ret = -EINVAL; 1631 kfree(cm_id_priv->timewait_info); 1632 goto destroy; 1633 } 1634 1635 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1636 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1637 cm_id_priv->id.service_id = req_msg->service_id; 1638 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1639 1640 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1641 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1642 1643 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1644 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit; 1645 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1646 work->port->port_num, 1647 cm_id_priv->av.ah_attr.grh.sgid_index, 1648 &gid, &gid_attr); 1649 if (!ret) { 1650 if (gid_attr.ndev) { 1651 work->path[0].ifindex = gid_attr.ndev->ifindex; 1652 work->path[0].net = dev_net(gid_attr.ndev); 1653 dev_put(gid_attr.ndev); 1654 } 1655 work->path[0].gid_type = gid_attr.gid_type; 1656 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1657 } 1658 if (ret) { 1659 int err = ib_get_cached_gid(work->port->cm_dev->ib_device, 1660 work->port->port_num, 0, 1661 &work->path[0].sgid, 1662 &gid_attr); 1663 if (!err && gid_attr.ndev) { 1664 work->path[0].ifindex = gid_attr.ndev->ifindex; 1665 work->path[0].net = dev_net(gid_attr.ndev); 1666 dev_put(gid_attr.ndev); 1667 } 1668 work->path[0].gid_type = gid_attr.gid_type; 1669 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1670 &work->path[0].sgid, sizeof work->path[0].sgid, 1671 NULL, 0); 1672 goto rejected; 1673 } 1674 if (req_msg->alt_local_lid) { 1675 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1676 if (ret) { 1677 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1678 &work->path[0].sgid, 1679 sizeof work->path[0].sgid, NULL, 0); 1680 goto rejected; 1681 } 1682 } 1683 cm_id_priv->tid = req_msg->hdr.tid; 1684 cm_id_priv->timeout_ms = cm_convert_to_ms( 1685 cm_req_get_local_resp_timeout(req_msg)); 1686 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1687 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1688 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1689 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1690 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1691 cm_id_priv->pkey = req_msg->pkey; 1692 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1693 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1694 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1695 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1696 1697 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1698 cm_process_work(cm_id_priv, work); 1699 cm_deref_id(listen_cm_id_priv); 1700 return 0; 1701 1702 rejected: 1703 atomic_dec(&cm_id_priv->refcount); 1704 cm_deref_id(listen_cm_id_priv); 1705 destroy: 1706 ib_destroy_cm_id(cm_id); 1707 return ret; 1708 } 1709 1710 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1711 struct cm_id_private *cm_id_priv, 1712 struct ib_cm_rep_param *param) 1713 { 1714 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1715 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1716 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1717 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1718 rep_msg->resp_resources = param->responder_resources; 1719 cm_rep_set_target_ack_delay(rep_msg, 1720 cm_id_priv->av.port->cm_dev->ack_delay); 1721 cm_rep_set_failover(rep_msg, param->failover_accepted); 1722 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1723 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1724 1725 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1726 rep_msg->initiator_depth = param->initiator_depth; 1727 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1728 cm_rep_set_srq(rep_msg, param->srq); 1729 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1730 } else { 1731 cm_rep_set_srq(rep_msg, 1); 1732 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1733 } 1734 1735 if (param->private_data && param->private_data_len) 1736 memcpy(rep_msg->private_data, param->private_data, 1737 param->private_data_len); 1738 } 1739 1740 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1741 struct ib_cm_rep_param *param) 1742 { 1743 struct cm_id_private *cm_id_priv; 1744 struct ib_mad_send_buf *msg; 1745 struct cm_rep_msg *rep_msg; 1746 unsigned long flags; 1747 int ret; 1748 1749 if (param->private_data && 1750 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1751 return -EINVAL; 1752 1753 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1754 spin_lock_irqsave(&cm_id_priv->lock, flags); 1755 if (cm_id->state != IB_CM_REQ_RCVD && 1756 cm_id->state != IB_CM_MRA_REQ_SENT) { 1757 ret = -EINVAL; 1758 goto out; 1759 } 1760 1761 ret = cm_alloc_msg(cm_id_priv, &msg); 1762 if (ret) 1763 goto out; 1764 1765 rep_msg = (struct cm_rep_msg *) msg->mad; 1766 cm_format_rep(rep_msg, cm_id_priv, param); 1767 msg->timeout_ms = cm_id_priv->timeout_ms; 1768 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1769 1770 ret = ib_post_send_mad(msg, NULL); 1771 if (ret) { 1772 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1773 cm_free_msg(msg); 1774 return ret; 1775 } 1776 1777 cm_id->state = IB_CM_REP_SENT; 1778 cm_id_priv->msg = msg; 1779 cm_id_priv->initiator_depth = param->initiator_depth; 1780 cm_id_priv->responder_resources = param->responder_resources; 1781 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1782 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1783 1784 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1785 return ret; 1786 } 1787 EXPORT_SYMBOL(ib_send_cm_rep); 1788 1789 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1790 struct cm_id_private *cm_id_priv, 1791 const void *private_data, 1792 u8 private_data_len) 1793 { 1794 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1795 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1796 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1797 1798 if (private_data && private_data_len) 1799 memcpy(rtu_msg->private_data, private_data, private_data_len); 1800 } 1801 1802 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1803 const void *private_data, 1804 u8 private_data_len) 1805 { 1806 struct cm_id_private *cm_id_priv; 1807 struct ib_mad_send_buf *msg; 1808 unsigned long flags; 1809 void *data; 1810 int ret; 1811 1812 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1813 return -EINVAL; 1814 1815 data = cm_copy_private_data(private_data, private_data_len); 1816 if (IS_ERR(data)) 1817 return PTR_ERR(data); 1818 1819 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1820 spin_lock_irqsave(&cm_id_priv->lock, flags); 1821 if (cm_id->state != IB_CM_REP_RCVD && 1822 cm_id->state != IB_CM_MRA_REP_SENT) { 1823 ret = -EINVAL; 1824 goto error; 1825 } 1826 1827 ret = cm_alloc_msg(cm_id_priv, &msg); 1828 if (ret) 1829 goto error; 1830 1831 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1832 private_data, private_data_len); 1833 1834 ret = ib_post_send_mad(msg, NULL); 1835 if (ret) { 1836 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1837 cm_free_msg(msg); 1838 kfree(data); 1839 return ret; 1840 } 1841 1842 cm_id->state = IB_CM_ESTABLISHED; 1843 cm_set_private_data(cm_id_priv, data, private_data_len); 1844 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1845 return 0; 1846 1847 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1848 kfree(data); 1849 return ret; 1850 } 1851 EXPORT_SYMBOL(ib_send_cm_rtu); 1852 1853 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1854 { 1855 struct cm_rep_msg *rep_msg; 1856 struct ib_cm_rep_event_param *param; 1857 1858 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1859 param = &work->cm_event.param.rep_rcvd; 1860 param->remote_ca_guid = rep_msg->local_ca_guid; 1861 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1862 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1863 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1864 param->responder_resources = rep_msg->initiator_depth; 1865 param->initiator_depth = rep_msg->resp_resources; 1866 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1867 param->failover_accepted = cm_rep_get_failover(rep_msg); 1868 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1869 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1870 param->srq = cm_rep_get_srq(rep_msg); 1871 work->cm_event.private_data = &rep_msg->private_data; 1872 } 1873 1874 static void cm_dup_rep_handler(struct cm_work *work) 1875 { 1876 struct cm_id_private *cm_id_priv; 1877 struct cm_rep_msg *rep_msg; 1878 struct ib_mad_send_buf *msg = NULL; 1879 int ret; 1880 1881 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1882 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1883 rep_msg->local_comm_id); 1884 if (!cm_id_priv) 1885 return; 1886 1887 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1888 counter[CM_REP_COUNTER]); 1889 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1890 if (ret) 1891 goto deref; 1892 1893 spin_lock_irq(&cm_id_priv->lock); 1894 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1895 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1896 cm_id_priv->private_data, 1897 cm_id_priv->private_data_len); 1898 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1899 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1900 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1901 cm_id_priv->private_data, 1902 cm_id_priv->private_data_len); 1903 else 1904 goto unlock; 1905 spin_unlock_irq(&cm_id_priv->lock); 1906 1907 ret = ib_post_send_mad(msg, NULL); 1908 if (ret) 1909 goto free; 1910 goto deref; 1911 1912 unlock: spin_unlock_irq(&cm_id_priv->lock); 1913 free: cm_free_msg(msg); 1914 deref: cm_deref_id(cm_id_priv); 1915 } 1916 1917 static int cm_rep_handler(struct cm_work *work) 1918 { 1919 struct cm_id_private *cm_id_priv; 1920 struct cm_rep_msg *rep_msg; 1921 int ret; 1922 1923 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1924 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1925 if (!cm_id_priv) { 1926 cm_dup_rep_handler(work); 1927 return -EINVAL; 1928 } 1929 1930 cm_format_rep_event(work, cm_id_priv->qp_type); 1931 1932 spin_lock_irq(&cm_id_priv->lock); 1933 switch (cm_id_priv->id.state) { 1934 case IB_CM_REQ_SENT: 1935 case IB_CM_MRA_REQ_RCVD: 1936 break; 1937 default: 1938 spin_unlock_irq(&cm_id_priv->lock); 1939 ret = -EINVAL; 1940 goto error; 1941 } 1942 1943 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1944 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1945 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1946 1947 spin_lock(&cm.lock); 1948 /* Check for duplicate REP. */ 1949 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1950 spin_unlock(&cm.lock); 1951 spin_unlock_irq(&cm_id_priv->lock); 1952 ret = -EINVAL; 1953 goto error; 1954 } 1955 /* Check for a stale connection. */ 1956 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1957 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1958 &cm.remote_id_table); 1959 cm_id_priv->timewait_info->inserted_remote_id = 0; 1960 spin_unlock(&cm.lock); 1961 spin_unlock_irq(&cm_id_priv->lock); 1962 cm_issue_rej(work->port, work->mad_recv_wc, 1963 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1964 NULL, 0); 1965 ret = -EINVAL; 1966 goto error; 1967 } 1968 spin_unlock(&cm.lock); 1969 1970 cm_id_priv->id.state = IB_CM_REP_RCVD; 1971 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1972 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1973 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1974 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1975 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1976 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1977 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1978 cm_id_priv->av.timeout = 1979 cm_ack_timeout(cm_id_priv->target_ack_delay, 1980 cm_id_priv->av.timeout - 1); 1981 cm_id_priv->alt_av.timeout = 1982 cm_ack_timeout(cm_id_priv->target_ack_delay, 1983 cm_id_priv->alt_av.timeout - 1); 1984 1985 /* todo: handle peer_to_peer */ 1986 1987 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1988 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1989 if (!ret) 1990 list_add_tail(&work->list, &cm_id_priv->work_list); 1991 spin_unlock_irq(&cm_id_priv->lock); 1992 1993 if (ret) 1994 cm_process_work(cm_id_priv, work); 1995 else 1996 cm_deref_id(cm_id_priv); 1997 return 0; 1998 1999 error: 2000 cm_deref_id(cm_id_priv); 2001 return ret; 2002 } 2003 2004 static int cm_establish_handler(struct cm_work *work) 2005 { 2006 struct cm_id_private *cm_id_priv; 2007 int ret; 2008 2009 /* See comment in cm_establish about lookup. */ 2010 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2011 if (!cm_id_priv) 2012 return -EINVAL; 2013 2014 spin_lock_irq(&cm_id_priv->lock); 2015 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2016 spin_unlock_irq(&cm_id_priv->lock); 2017 goto out; 2018 } 2019 2020 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2021 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2022 if (!ret) 2023 list_add_tail(&work->list, &cm_id_priv->work_list); 2024 spin_unlock_irq(&cm_id_priv->lock); 2025 2026 if (ret) 2027 cm_process_work(cm_id_priv, work); 2028 else 2029 cm_deref_id(cm_id_priv); 2030 return 0; 2031 out: 2032 cm_deref_id(cm_id_priv); 2033 return -EINVAL; 2034 } 2035 2036 static int cm_rtu_handler(struct cm_work *work) 2037 { 2038 struct cm_id_private *cm_id_priv; 2039 struct cm_rtu_msg *rtu_msg; 2040 int ret; 2041 2042 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2043 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2044 rtu_msg->local_comm_id); 2045 if (!cm_id_priv) 2046 return -EINVAL; 2047 2048 work->cm_event.private_data = &rtu_msg->private_data; 2049 2050 spin_lock_irq(&cm_id_priv->lock); 2051 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2052 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2053 spin_unlock_irq(&cm_id_priv->lock); 2054 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2055 counter[CM_RTU_COUNTER]); 2056 goto out; 2057 } 2058 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2059 2060 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2061 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2062 if (!ret) 2063 list_add_tail(&work->list, &cm_id_priv->work_list); 2064 spin_unlock_irq(&cm_id_priv->lock); 2065 2066 if (ret) 2067 cm_process_work(cm_id_priv, work); 2068 else 2069 cm_deref_id(cm_id_priv); 2070 return 0; 2071 out: 2072 cm_deref_id(cm_id_priv); 2073 return -EINVAL; 2074 } 2075 2076 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2077 struct cm_id_private *cm_id_priv, 2078 const void *private_data, 2079 u8 private_data_len) 2080 { 2081 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2082 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2083 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2084 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2085 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2086 2087 if (private_data && private_data_len) 2088 memcpy(dreq_msg->private_data, private_data, private_data_len); 2089 } 2090 2091 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2092 const void *private_data, 2093 u8 private_data_len) 2094 { 2095 struct cm_id_private *cm_id_priv; 2096 struct ib_mad_send_buf *msg; 2097 unsigned long flags; 2098 int ret; 2099 2100 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2101 return -EINVAL; 2102 2103 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2104 spin_lock_irqsave(&cm_id_priv->lock, flags); 2105 if (cm_id->state != IB_CM_ESTABLISHED) { 2106 ret = -EINVAL; 2107 goto out; 2108 } 2109 2110 if (cm_id->lap_state == IB_CM_LAP_SENT || 2111 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2112 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2113 2114 ret = cm_alloc_msg(cm_id_priv, &msg); 2115 if (ret) { 2116 cm_enter_timewait(cm_id_priv); 2117 goto out; 2118 } 2119 2120 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2121 private_data, private_data_len); 2122 msg->timeout_ms = cm_id_priv->timeout_ms; 2123 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2124 2125 ret = ib_post_send_mad(msg, NULL); 2126 if (ret) { 2127 cm_enter_timewait(cm_id_priv); 2128 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2129 cm_free_msg(msg); 2130 return ret; 2131 } 2132 2133 cm_id->state = IB_CM_DREQ_SENT; 2134 cm_id_priv->msg = msg; 2135 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2136 return ret; 2137 } 2138 EXPORT_SYMBOL(ib_send_cm_dreq); 2139 2140 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2141 struct cm_id_private *cm_id_priv, 2142 const void *private_data, 2143 u8 private_data_len) 2144 { 2145 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2146 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2147 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2148 2149 if (private_data && private_data_len) 2150 memcpy(drep_msg->private_data, private_data, private_data_len); 2151 } 2152 2153 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2154 const void *private_data, 2155 u8 private_data_len) 2156 { 2157 struct cm_id_private *cm_id_priv; 2158 struct ib_mad_send_buf *msg; 2159 unsigned long flags; 2160 void *data; 2161 int ret; 2162 2163 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2164 return -EINVAL; 2165 2166 data = cm_copy_private_data(private_data, private_data_len); 2167 if (IS_ERR(data)) 2168 return PTR_ERR(data); 2169 2170 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2171 spin_lock_irqsave(&cm_id_priv->lock, flags); 2172 if (cm_id->state != IB_CM_DREQ_RCVD) { 2173 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2174 kfree(data); 2175 return -EINVAL; 2176 } 2177 2178 cm_set_private_data(cm_id_priv, data, private_data_len); 2179 cm_enter_timewait(cm_id_priv); 2180 2181 ret = cm_alloc_msg(cm_id_priv, &msg); 2182 if (ret) 2183 goto out; 2184 2185 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2186 private_data, private_data_len); 2187 2188 ret = ib_post_send_mad(msg, NULL); 2189 if (ret) { 2190 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2191 cm_free_msg(msg); 2192 return ret; 2193 } 2194 2195 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2196 return ret; 2197 } 2198 EXPORT_SYMBOL(ib_send_cm_drep); 2199 2200 static int cm_issue_drep(struct cm_port *port, 2201 struct ib_mad_recv_wc *mad_recv_wc) 2202 { 2203 struct ib_mad_send_buf *msg = NULL; 2204 struct cm_dreq_msg *dreq_msg; 2205 struct cm_drep_msg *drep_msg; 2206 int ret; 2207 2208 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2209 if (ret) 2210 return ret; 2211 2212 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2213 drep_msg = (struct cm_drep_msg *) msg->mad; 2214 2215 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2216 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2217 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2218 2219 ret = ib_post_send_mad(msg, NULL); 2220 if (ret) 2221 cm_free_msg(msg); 2222 2223 return ret; 2224 } 2225 2226 static int cm_dreq_handler(struct cm_work *work) 2227 { 2228 struct cm_id_private *cm_id_priv; 2229 struct cm_dreq_msg *dreq_msg; 2230 struct ib_mad_send_buf *msg = NULL; 2231 int ret; 2232 2233 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2234 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2235 dreq_msg->local_comm_id); 2236 if (!cm_id_priv) { 2237 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2238 counter[CM_DREQ_COUNTER]); 2239 cm_issue_drep(work->port, work->mad_recv_wc); 2240 return -EINVAL; 2241 } 2242 2243 work->cm_event.private_data = &dreq_msg->private_data; 2244 2245 spin_lock_irq(&cm_id_priv->lock); 2246 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2247 goto unlock; 2248 2249 switch (cm_id_priv->id.state) { 2250 case IB_CM_REP_SENT: 2251 case IB_CM_DREQ_SENT: 2252 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2253 break; 2254 case IB_CM_ESTABLISHED: 2255 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2256 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2257 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2258 break; 2259 case IB_CM_MRA_REP_RCVD: 2260 break; 2261 case IB_CM_TIMEWAIT: 2262 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2263 counter[CM_DREQ_COUNTER]); 2264 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2265 goto unlock; 2266 2267 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2268 cm_id_priv->private_data, 2269 cm_id_priv->private_data_len); 2270 spin_unlock_irq(&cm_id_priv->lock); 2271 2272 if (ib_post_send_mad(msg, NULL)) 2273 cm_free_msg(msg); 2274 goto deref; 2275 case IB_CM_DREQ_RCVD: 2276 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2277 counter[CM_DREQ_COUNTER]); 2278 goto unlock; 2279 default: 2280 goto unlock; 2281 } 2282 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2283 cm_id_priv->tid = dreq_msg->hdr.tid; 2284 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2285 if (!ret) 2286 list_add_tail(&work->list, &cm_id_priv->work_list); 2287 spin_unlock_irq(&cm_id_priv->lock); 2288 2289 if (ret) 2290 cm_process_work(cm_id_priv, work); 2291 else 2292 cm_deref_id(cm_id_priv); 2293 return 0; 2294 2295 unlock: spin_unlock_irq(&cm_id_priv->lock); 2296 deref: cm_deref_id(cm_id_priv); 2297 return -EINVAL; 2298 } 2299 2300 static int cm_drep_handler(struct cm_work *work) 2301 { 2302 struct cm_id_private *cm_id_priv; 2303 struct cm_drep_msg *drep_msg; 2304 int ret; 2305 2306 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2307 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2308 drep_msg->local_comm_id); 2309 if (!cm_id_priv) 2310 return -EINVAL; 2311 2312 work->cm_event.private_data = &drep_msg->private_data; 2313 2314 spin_lock_irq(&cm_id_priv->lock); 2315 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2316 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2317 spin_unlock_irq(&cm_id_priv->lock); 2318 goto out; 2319 } 2320 cm_enter_timewait(cm_id_priv); 2321 2322 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2323 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2324 if (!ret) 2325 list_add_tail(&work->list, &cm_id_priv->work_list); 2326 spin_unlock_irq(&cm_id_priv->lock); 2327 2328 if (ret) 2329 cm_process_work(cm_id_priv, work); 2330 else 2331 cm_deref_id(cm_id_priv); 2332 return 0; 2333 out: 2334 cm_deref_id(cm_id_priv); 2335 return -EINVAL; 2336 } 2337 2338 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2339 enum ib_cm_rej_reason reason, 2340 void *ari, 2341 u8 ari_length, 2342 const void *private_data, 2343 u8 private_data_len) 2344 { 2345 struct cm_id_private *cm_id_priv; 2346 struct ib_mad_send_buf *msg; 2347 unsigned long flags; 2348 int ret; 2349 2350 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2351 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2352 return -EINVAL; 2353 2354 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2355 2356 spin_lock_irqsave(&cm_id_priv->lock, flags); 2357 switch (cm_id->state) { 2358 case IB_CM_REQ_SENT: 2359 case IB_CM_MRA_REQ_RCVD: 2360 case IB_CM_REQ_RCVD: 2361 case IB_CM_MRA_REQ_SENT: 2362 case IB_CM_REP_RCVD: 2363 case IB_CM_MRA_REP_SENT: 2364 ret = cm_alloc_msg(cm_id_priv, &msg); 2365 if (!ret) 2366 cm_format_rej((struct cm_rej_msg *) msg->mad, 2367 cm_id_priv, reason, ari, ari_length, 2368 private_data, private_data_len); 2369 2370 cm_reset_to_idle(cm_id_priv); 2371 break; 2372 case IB_CM_REP_SENT: 2373 case IB_CM_MRA_REP_RCVD: 2374 ret = cm_alloc_msg(cm_id_priv, &msg); 2375 if (!ret) 2376 cm_format_rej((struct cm_rej_msg *) msg->mad, 2377 cm_id_priv, reason, ari, ari_length, 2378 private_data, private_data_len); 2379 2380 cm_enter_timewait(cm_id_priv); 2381 break; 2382 default: 2383 ret = -EINVAL; 2384 goto out; 2385 } 2386 2387 if (ret) 2388 goto out; 2389 2390 ret = ib_post_send_mad(msg, NULL); 2391 if (ret) 2392 cm_free_msg(msg); 2393 2394 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2395 return ret; 2396 } 2397 EXPORT_SYMBOL(ib_send_cm_rej); 2398 2399 static void cm_format_rej_event(struct cm_work *work) 2400 { 2401 struct cm_rej_msg *rej_msg; 2402 struct ib_cm_rej_event_param *param; 2403 2404 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2405 param = &work->cm_event.param.rej_rcvd; 2406 param->ari = rej_msg->ari; 2407 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2408 param->reason = __be16_to_cpu(rej_msg->reason); 2409 work->cm_event.private_data = &rej_msg->private_data; 2410 } 2411 2412 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2413 { 2414 struct cm_timewait_info *timewait_info; 2415 struct cm_id_private *cm_id_priv; 2416 __be32 remote_id; 2417 2418 remote_id = rej_msg->local_comm_id; 2419 2420 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2421 spin_lock_irq(&cm.lock); 2422 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2423 remote_id); 2424 if (!timewait_info) { 2425 spin_unlock_irq(&cm.lock); 2426 return NULL; 2427 } 2428 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2429 (timewait_info->work.local_id ^ 2430 cm.random_id_operand)); 2431 if (cm_id_priv) { 2432 if (cm_id_priv->id.remote_id == remote_id) 2433 atomic_inc(&cm_id_priv->refcount); 2434 else 2435 cm_id_priv = NULL; 2436 } 2437 spin_unlock_irq(&cm.lock); 2438 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2439 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2440 else 2441 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2442 2443 return cm_id_priv; 2444 } 2445 2446 static int cm_rej_handler(struct cm_work *work) 2447 { 2448 struct cm_id_private *cm_id_priv; 2449 struct cm_rej_msg *rej_msg; 2450 int ret; 2451 2452 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2453 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2454 if (!cm_id_priv) 2455 return -EINVAL; 2456 2457 cm_format_rej_event(work); 2458 2459 spin_lock_irq(&cm_id_priv->lock); 2460 switch (cm_id_priv->id.state) { 2461 case IB_CM_REQ_SENT: 2462 case IB_CM_MRA_REQ_RCVD: 2463 case IB_CM_REP_SENT: 2464 case IB_CM_MRA_REP_RCVD: 2465 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2466 /* fall through */ 2467 case IB_CM_REQ_RCVD: 2468 case IB_CM_MRA_REQ_SENT: 2469 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2470 cm_enter_timewait(cm_id_priv); 2471 else 2472 cm_reset_to_idle(cm_id_priv); 2473 break; 2474 case IB_CM_DREQ_SENT: 2475 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2476 /* fall through */ 2477 case IB_CM_REP_RCVD: 2478 case IB_CM_MRA_REP_SENT: 2479 cm_enter_timewait(cm_id_priv); 2480 break; 2481 case IB_CM_ESTABLISHED: 2482 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2483 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2484 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2485 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2486 cm_id_priv->msg); 2487 cm_enter_timewait(cm_id_priv); 2488 break; 2489 } 2490 /* fall through */ 2491 default: 2492 spin_unlock_irq(&cm_id_priv->lock); 2493 ret = -EINVAL; 2494 goto out; 2495 } 2496 2497 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2498 if (!ret) 2499 list_add_tail(&work->list, &cm_id_priv->work_list); 2500 spin_unlock_irq(&cm_id_priv->lock); 2501 2502 if (ret) 2503 cm_process_work(cm_id_priv, work); 2504 else 2505 cm_deref_id(cm_id_priv); 2506 return 0; 2507 out: 2508 cm_deref_id(cm_id_priv); 2509 return -EINVAL; 2510 } 2511 2512 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2513 u8 service_timeout, 2514 const void *private_data, 2515 u8 private_data_len) 2516 { 2517 struct cm_id_private *cm_id_priv; 2518 struct ib_mad_send_buf *msg; 2519 enum ib_cm_state cm_state; 2520 enum ib_cm_lap_state lap_state; 2521 enum cm_msg_response msg_response; 2522 void *data; 2523 unsigned long flags; 2524 int ret; 2525 2526 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2527 return -EINVAL; 2528 2529 data = cm_copy_private_data(private_data, private_data_len); 2530 if (IS_ERR(data)) 2531 return PTR_ERR(data); 2532 2533 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2534 2535 spin_lock_irqsave(&cm_id_priv->lock, flags); 2536 switch(cm_id_priv->id.state) { 2537 case IB_CM_REQ_RCVD: 2538 cm_state = IB_CM_MRA_REQ_SENT; 2539 lap_state = cm_id->lap_state; 2540 msg_response = CM_MSG_RESPONSE_REQ; 2541 break; 2542 case IB_CM_REP_RCVD: 2543 cm_state = IB_CM_MRA_REP_SENT; 2544 lap_state = cm_id->lap_state; 2545 msg_response = CM_MSG_RESPONSE_REP; 2546 break; 2547 case IB_CM_ESTABLISHED: 2548 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2549 cm_state = cm_id->state; 2550 lap_state = IB_CM_MRA_LAP_SENT; 2551 msg_response = CM_MSG_RESPONSE_OTHER; 2552 break; 2553 } 2554 default: 2555 ret = -EINVAL; 2556 goto error1; 2557 } 2558 2559 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2560 ret = cm_alloc_msg(cm_id_priv, &msg); 2561 if (ret) 2562 goto error1; 2563 2564 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2565 msg_response, service_timeout, 2566 private_data, private_data_len); 2567 ret = ib_post_send_mad(msg, NULL); 2568 if (ret) 2569 goto error2; 2570 } 2571 2572 cm_id->state = cm_state; 2573 cm_id->lap_state = lap_state; 2574 cm_id_priv->service_timeout = service_timeout; 2575 cm_set_private_data(cm_id_priv, data, private_data_len); 2576 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2577 return 0; 2578 2579 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2580 kfree(data); 2581 return ret; 2582 2583 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2584 kfree(data); 2585 cm_free_msg(msg); 2586 return ret; 2587 } 2588 EXPORT_SYMBOL(ib_send_cm_mra); 2589 2590 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2591 { 2592 switch (cm_mra_get_msg_mraed(mra_msg)) { 2593 case CM_MSG_RESPONSE_REQ: 2594 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2595 case CM_MSG_RESPONSE_REP: 2596 case CM_MSG_RESPONSE_OTHER: 2597 return cm_acquire_id(mra_msg->remote_comm_id, 2598 mra_msg->local_comm_id); 2599 default: 2600 return NULL; 2601 } 2602 } 2603 2604 static int cm_mra_handler(struct cm_work *work) 2605 { 2606 struct cm_id_private *cm_id_priv; 2607 struct cm_mra_msg *mra_msg; 2608 int timeout, ret; 2609 2610 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2611 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2612 if (!cm_id_priv) 2613 return -EINVAL; 2614 2615 work->cm_event.private_data = &mra_msg->private_data; 2616 work->cm_event.param.mra_rcvd.service_timeout = 2617 cm_mra_get_service_timeout(mra_msg); 2618 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2619 cm_convert_to_ms(cm_id_priv->av.timeout); 2620 2621 spin_lock_irq(&cm_id_priv->lock); 2622 switch (cm_id_priv->id.state) { 2623 case IB_CM_REQ_SENT: 2624 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2625 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2626 cm_id_priv->msg, timeout)) 2627 goto out; 2628 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2629 break; 2630 case IB_CM_REP_SENT: 2631 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2632 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2633 cm_id_priv->msg, timeout)) 2634 goto out; 2635 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2636 break; 2637 case IB_CM_ESTABLISHED: 2638 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2639 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2640 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2641 cm_id_priv->msg, timeout)) { 2642 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2643 atomic_long_inc(&work->port-> 2644 counter_group[CM_RECV_DUPLICATES]. 2645 counter[CM_MRA_COUNTER]); 2646 goto out; 2647 } 2648 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2649 break; 2650 case IB_CM_MRA_REQ_RCVD: 2651 case IB_CM_MRA_REP_RCVD: 2652 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2653 counter[CM_MRA_COUNTER]); 2654 /* fall through */ 2655 default: 2656 goto out; 2657 } 2658 2659 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2660 cm_id_priv->id.state; 2661 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2662 if (!ret) 2663 list_add_tail(&work->list, &cm_id_priv->work_list); 2664 spin_unlock_irq(&cm_id_priv->lock); 2665 2666 if (ret) 2667 cm_process_work(cm_id_priv, work); 2668 else 2669 cm_deref_id(cm_id_priv); 2670 return 0; 2671 out: 2672 spin_unlock_irq(&cm_id_priv->lock); 2673 cm_deref_id(cm_id_priv); 2674 return -EINVAL; 2675 } 2676 2677 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2678 struct cm_id_private *cm_id_priv, 2679 struct ib_sa_path_rec *alternate_path, 2680 const void *private_data, 2681 u8 private_data_len) 2682 { 2683 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2684 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2685 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2686 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2687 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2688 /* todo: need remote CM response timeout */ 2689 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2690 lap_msg->alt_local_lid = alternate_path->slid; 2691 lap_msg->alt_remote_lid = alternate_path->dlid; 2692 lap_msg->alt_local_gid = alternate_path->sgid; 2693 lap_msg->alt_remote_gid = alternate_path->dgid; 2694 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2695 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2696 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2697 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2698 cm_lap_set_sl(lap_msg, alternate_path->sl); 2699 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2700 cm_lap_set_local_ack_timeout(lap_msg, 2701 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2702 alternate_path->packet_life_time)); 2703 2704 if (private_data && private_data_len) 2705 memcpy(lap_msg->private_data, private_data, private_data_len); 2706 } 2707 2708 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2709 struct ib_sa_path_rec *alternate_path, 2710 const void *private_data, 2711 u8 private_data_len) 2712 { 2713 struct cm_id_private *cm_id_priv; 2714 struct ib_mad_send_buf *msg; 2715 unsigned long flags; 2716 int ret; 2717 2718 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2719 return -EINVAL; 2720 2721 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2722 spin_lock_irqsave(&cm_id_priv->lock, flags); 2723 if (cm_id->state != IB_CM_ESTABLISHED || 2724 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2725 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2726 ret = -EINVAL; 2727 goto out; 2728 } 2729 2730 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2731 if (ret) 2732 goto out; 2733 cm_id_priv->alt_av.timeout = 2734 cm_ack_timeout(cm_id_priv->target_ack_delay, 2735 cm_id_priv->alt_av.timeout - 1); 2736 2737 ret = cm_alloc_msg(cm_id_priv, &msg); 2738 if (ret) 2739 goto out; 2740 2741 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2742 alternate_path, private_data, private_data_len); 2743 msg->timeout_ms = cm_id_priv->timeout_ms; 2744 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2745 2746 ret = ib_post_send_mad(msg, NULL); 2747 if (ret) { 2748 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2749 cm_free_msg(msg); 2750 return ret; 2751 } 2752 2753 cm_id->lap_state = IB_CM_LAP_SENT; 2754 cm_id_priv->msg = msg; 2755 2756 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2757 return ret; 2758 } 2759 EXPORT_SYMBOL(ib_send_cm_lap); 2760 2761 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2762 struct ib_sa_path_rec *path, 2763 struct cm_lap_msg *lap_msg) 2764 { 2765 memset(path, 0, sizeof *path); 2766 path->dgid = lap_msg->alt_local_gid; 2767 path->sgid = lap_msg->alt_remote_gid; 2768 path->dlid = lap_msg->alt_local_lid; 2769 path->slid = lap_msg->alt_remote_lid; 2770 path->flow_label = cm_lap_get_flow_label(lap_msg); 2771 path->hop_limit = lap_msg->alt_hop_limit; 2772 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2773 path->reversible = 1; 2774 path->pkey = cm_id_priv->pkey; 2775 path->sl = cm_lap_get_sl(lap_msg); 2776 path->mtu_selector = IB_SA_EQ; 2777 path->mtu = cm_id_priv->path_mtu; 2778 path->rate_selector = IB_SA_EQ; 2779 path->rate = cm_lap_get_packet_rate(lap_msg); 2780 path->packet_life_time_selector = IB_SA_EQ; 2781 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2782 path->packet_life_time -= (path->packet_life_time > 0); 2783 } 2784 2785 static int cm_lap_handler(struct cm_work *work) 2786 { 2787 struct cm_id_private *cm_id_priv; 2788 struct cm_lap_msg *lap_msg; 2789 struct ib_cm_lap_event_param *param; 2790 struct ib_mad_send_buf *msg = NULL; 2791 int ret; 2792 2793 /* todo: verify LAP request and send reject APR if invalid. */ 2794 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2795 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2796 lap_msg->local_comm_id); 2797 if (!cm_id_priv) 2798 return -EINVAL; 2799 2800 param = &work->cm_event.param.lap_rcvd; 2801 param->alternate_path = &work->path[0]; 2802 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2803 work->cm_event.private_data = &lap_msg->private_data; 2804 2805 spin_lock_irq(&cm_id_priv->lock); 2806 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2807 goto unlock; 2808 2809 switch (cm_id_priv->id.lap_state) { 2810 case IB_CM_LAP_UNINIT: 2811 case IB_CM_LAP_IDLE: 2812 break; 2813 case IB_CM_MRA_LAP_SENT: 2814 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2815 counter[CM_LAP_COUNTER]); 2816 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2817 goto unlock; 2818 2819 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2820 CM_MSG_RESPONSE_OTHER, 2821 cm_id_priv->service_timeout, 2822 cm_id_priv->private_data, 2823 cm_id_priv->private_data_len); 2824 spin_unlock_irq(&cm_id_priv->lock); 2825 2826 if (ib_post_send_mad(msg, NULL)) 2827 cm_free_msg(msg); 2828 goto deref; 2829 case IB_CM_LAP_RCVD: 2830 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2831 counter[CM_LAP_COUNTER]); 2832 goto unlock; 2833 default: 2834 goto unlock; 2835 } 2836 2837 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2838 cm_id_priv->tid = lap_msg->hdr.tid; 2839 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2840 work->mad_recv_wc->recv_buf.grh, 2841 &cm_id_priv->av); 2842 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2843 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2844 if (!ret) 2845 list_add_tail(&work->list, &cm_id_priv->work_list); 2846 spin_unlock_irq(&cm_id_priv->lock); 2847 2848 if (ret) 2849 cm_process_work(cm_id_priv, work); 2850 else 2851 cm_deref_id(cm_id_priv); 2852 return 0; 2853 2854 unlock: spin_unlock_irq(&cm_id_priv->lock); 2855 deref: cm_deref_id(cm_id_priv); 2856 return -EINVAL; 2857 } 2858 2859 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2860 struct cm_id_private *cm_id_priv, 2861 enum ib_cm_apr_status status, 2862 void *info, 2863 u8 info_length, 2864 const void *private_data, 2865 u8 private_data_len) 2866 { 2867 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2868 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2869 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2870 apr_msg->ap_status = (u8) status; 2871 2872 if (info && info_length) { 2873 apr_msg->info_length = info_length; 2874 memcpy(apr_msg->info, info, info_length); 2875 } 2876 2877 if (private_data && private_data_len) 2878 memcpy(apr_msg->private_data, private_data, private_data_len); 2879 } 2880 2881 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2882 enum ib_cm_apr_status status, 2883 void *info, 2884 u8 info_length, 2885 const void *private_data, 2886 u8 private_data_len) 2887 { 2888 struct cm_id_private *cm_id_priv; 2889 struct ib_mad_send_buf *msg; 2890 unsigned long flags; 2891 int ret; 2892 2893 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2894 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2895 return -EINVAL; 2896 2897 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2898 spin_lock_irqsave(&cm_id_priv->lock, flags); 2899 if (cm_id->state != IB_CM_ESTABLISHED || 2900 (cm_id->lap_state != IB_CM_LAP_RCVD && 2901 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2902 ret = -EINVAL; 2903 goto out; 2904 } 2905 2906 ret = cm_alloc_msg(cm_id_priv, &msg); 2907 if (ret) 2908 goto out; 2909 2910 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2911 info, info_length, private_data, private_data_len); 2912 ret = ib_post_send_mad(msg, NULL); 2913 if (ret) { 2914 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2915 cm_free_msg(msg); 2916 return ret; 2917 } 2918 2919 cm_id->lap_state = IB_CM_LAP_IDLE; 2920 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2921 return ret; 2922 } 2923 EXPORT_SYMBOL(ib_send_cm_apr); 2924 2925 static int cm_apr_handler(struct cm_work *work) 2926 { 2927 struct cm_id_private *cm_id_priv; 2928 struct cm_apr_msg *apr_msg; 2929 int ret; 2930 2931 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2932 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2933 apr_msg->local_comm_id); 2934 if (!cm_id_priv) 2935 return -EINVAL; /* Unmatched reply. */ 2936 2937 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2938 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2939 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2940 work->cm_event.private_data = &apr_msg->private_data; 2941 2942 spin_lock_irq(&cm_id_priv->lock); 2943 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2944 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2945 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2946 spin_unlock_irq(&cm_id_priv->lock); 2947 goto out; 2948 } 2949 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2950 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2951 cm_id_priv->msg = NULL; 2952 2953 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2954 if (!ret) 2955 list_add_tail(&work->list, &cm_id_priv->work_list); 2956 spin_unlock_irq(&cm_id_priv->lock); 2957 2958 if (ret) 2959 cm_process_work(cm_id_priv, work); 2960 else 2961 cm_deref_id(cm_id_priv); 2962 return 0; 2963 out: 2964 cm_deref_id(cm_id_priv); 2965 return -EINVAL; 2966 } 2967 2968 static int cm_timewait_handler(struct cm_work *work) 2969 { 2970 struct cm_timewait_info *timewait_info; 2971 struct cm_id_private *cm_id_priv; 2972 int ret; 2973 2974 timewait_info = (struct cm_timewait_info *)work; 2975 spin_lock_irq(&cm.lock); 2976 list_del(&timewait_info->list); 2977 spin_unlock_irq(&cm.lock); 2978 2979 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2980 timewait_info->work.remote_id); 2981 if (!cm_id_priv) 2982 return -EINVAL; 2983 2984 spin_lock_irq(&cm_id_priv->lock); 2985 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2986 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2987 spin_unlock_irq(&cm_id_priv->lock); 2988 goto out; 2989 } 2990 cm_id_priv->id.state = IB_CM_IDLE; 2991 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2992 if (!ret) 2993 list_add_tail(&work->list, &cm_id_priv->work_list); 2994 spin_unlock_irq(&cm_id_priv->lock); 2995 2996 if (ret) 2997 cm_process_work(cm_id_priv, work); 2998 else 2999 cm_deref_id(cm_id_priv); 3000 return 0; 3001 out: 3002 cm_deref_id(cm_id_priv); 3003 return -EINVAL; 3004 } 3005 3006 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3007 struct cm_id_private *cm_id_priv, 3008 struct ib_cm_sidr_req_param *param) 3009 { 3010 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3011 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 3012 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3013 sidr_req_msg->pkey = param->path->pkey; 3014 sidr_req_msg->service_id = param->service_id; 3015 3016 if (param->private_data && param->private_data_len) 3017 memcpy(sidr_req_msg->private_data, param->private_data, 3018 param->private_data_len); 3019 } 3020 3021 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3022 struct ib_cm_sidr_req_param *param) 3023 { 3024 struct cm_id_private *cm_id_priv; 3025 struct ib_mad_send_buf *msg; 3026 unsigned long flags; 3027 int ret; 3028 3029 if (!param->path || (param->private_data && 3030 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3031 return -EINVAL; 3032 3033 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3034 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 3035 if (ret) 3036 goto out; 3037 3038 cm_id->service_id = param->service_id; 3039 cm_id->service_mask = ~cpu_to_be64(0); 3040 cm_id_priv->timeout_ms = param->timeout_ms; 3041 cm_id_priv->max_cm_retries = param->max_cm_retries; 3042 ret = cm_alloc_msg(cm_id_priv, &msg); 3043 if (ret) 3044 goto out; 3045 3046 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3047 param); 3048 msg->timeout_ms = cm_id_priv->timeout_ms; 3049 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3050 3051 spin_lock_irqsave(&cm_id_priv->lock, flags); 3052 if (cm_id->state == IB_CM_IDLE) 3053 ret = ib_post_send_mad(msg, NULL); 3054 else 3055 ret = -EINVAL; 3056 3057 if (ret) { 3058 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3059 cm_free_msg(msg); 3060 goto out; 3061 } 3062 cm_id->state = IB_CM_SIDR_REQ_SENT; 3063 cm_id_priv->msg = msg; 3064 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3065 out: 3066 return ret; 3067 } 3068 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3069 3070 static void cm_format_sidr_req_event(struct cm_work *work, 3071 struct ib_cm_id *listen_id) 3072 { 3073 struct cm_sidr_req_msg *sidr_req_msg; 3074 struct ib_cm_sidr_req_event_param *param; 3075 3076 sidr_req_msg = (struct cm_sidr_req_msg *) 3077 work->mad_recv_wc->recv_buf.mad; 3078 param = &work->cm_event.param.sidr_req_rcvd; 3079 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3080 param->listen_id = listen_id; 3081 param->service_id = sidr_req_msg->service_id; 3082 param->bth_pkey = cm_get_bth_pkey(work); 3083 param->port = work->port->port_num; 3084 work->cm_event.private_data = &sidr_req_msg->private_data; 3085 } 3086 3087 static int cm_sidr_req_handler(struct cm_work *work) 3088 { 3089 struct ib_cm_id *cm_id; 3090 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3091 struct cm_sidr_req_msg *sidr_req_msg; 3092 struct ib_wc *wc; 3093 3094 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3095 if (IS_ERR(cm_id)) 3096 return PTR_ERR(cm_id); 3097 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3098 3099 /* Record SGID/SLID and request ID for lookup. */ 3100 sidr_req_msg = (struct cm_sidr_req_msg *) 3101 work->mad_recv_wc->recv_buf.mad; 3102 wc = work->mad_recv_wc->wc; 3103 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3104 cm_id_priv->av.dgid.global.interface_id = 0; 3105 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3106 work->mad_recv_wc->recv_buf.grh, 3107 &cm_id_priv->av); 3108 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3109 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3110 atomic_inc(&cm_id_priv->work_count); 3111 3112 spin_lock_irq(&cm.lock); 3113 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3114 if (cur_cm_id_priv) { 3115 spin_unlock_irq(&cm.lock); 3116 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3117 counter[CM_SIDR_REQ_COUNTER]); 3118 goto out; /* Duplicate message. */ 3119 } 3120 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3121 cur_cm_id_priv = cm_find_listen(cm_id->device, 3122 sidr_req_msg->service_id); 3123 if (!cur_cm_id_priv) { 3124 spin_unlock_irq(&cm.lock); 3125 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3126 goto out; /* No match. */ 3127 } 3128 atomic_inc(&cur_cm_id_priv->refcount); 3129 atomic_inc(&cm_id_priv->refcount); 3130 spin_unlock_irq(&cm.lock); 3131 3132 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3133 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3134 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3135 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3136 3137 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3138 cm_process_work(cm_id_priv, work); 3139 cm_deref_id(cur_cm_id_priv); 3140 return 0; 3141 out: 3142 ib_destroy_cm_id(&cm_id_priv->id); 3143 return -EINVAL; 3144 } 3145 3146 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3147 struct cm_id_private *cm_id_priv, 3148 struct ib_cm_sidr_rep_param *param) 3149 { 3150 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3151 cm_id_priv->tid); 3152 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3153 sidr_rep_msg->status = param->status; 3154 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3155 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3156 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3157 3158 if (param->info && param->info_length) 3159 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3160 3161 if (param->private_data && param->private_data_len) 3162 memcpy(sidr_rep_msg->private_data, param->private_data, 3163 param->private_data_len); 3164 } 3165 3166 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3167 struct ib_cm_sidr_rep_param *param) 3168 { 3169 struct cm_id_private *cm_id_priv; 3170 struct ib_mad_send_buf *msg; 3171 unsigned long flags; 3172 int ret; 3173 3174 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3175 (param->private_data && 3176 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3177 return -EINVAL; 3178 3179 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3180 spin_lock_irqsave(&cm_id_priv->lock, flags); 3181 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3182 ret = -EINVAL; 3183 goto error; 3184 } 3185 3186 ret = cm_alloc_msg(cm_id_priv, &msg); 3187 if (ret) 3188 goto error; 3189 3190 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3191 param); 3192 ret = ib_post_send_mad(msg, NULL); 3193 if (ret) { 3194 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3195 cm_free_msg(msg); 3196 return ret; 3197 } 3198 cm_id->state = IB_CM_IDLE; 3199 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3200 3201 spin_lock_irqsave(&cm.lock, flags); 3202 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3203 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3204 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3205 } 3206 spin_unlock_irqrestore(&cm.lock, flags); 3207 return 0; 3208 3209 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3210 return ret; 3211 } 3212 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3213 3214 static void cm_format_sidr_rep_event(struct cm_work *work) 3215 { 3216 struct cm_sidr_rep_msg *sidr_rep_msg; 3217 struct ib_cm_sidr_rep_event_param *param; 3218 3219 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3220 work->mad_recv_wc->recv_buf.mad; 3221 param = &work->cm_event.param.sidr_rep_rcvd; 3222 param->status = sidr_rep_msg->status; 3223 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3224 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3225 param->info = &sidr_rep_msg->info; 3226 param->info_len = sidr_rep_msg->info_length; 3227 work->cm_event.private_data = &sidr_rep_msg->private_data; 3228 } 3229 3230 static int cm_sidr_rep_handler(struct cm_work *work) 3231 { 3232 struct cm_sidr_rep_msg *sidr_rep_msg; 3233 struct cm_id_private *cm_id_priv; 3234 3235 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3236 work->mad_recv_wc->recv_buf.mad; 3237 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3238 if (!cm_id_priv) 3239 return -EINVAL; /* Unmatched reply. */ 3240 3241 spin_lock_irq(&cm_id_priv->lock); 3242 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3243 spin_unlock_irq(&cm_id_priv->lock); 3244 goto out; 3245 } 3246 cm_id_priv->id.state = IB_CM_IDLE; 3247 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3248 spin_unlock_irq(&cm_id_priv->lock); 3249 3250 cm_format_sidr_rep_event(work); 3251 cm_process_work(cm_id_priv, work); 3252 return 0; 3253 out: 3254 cm_deref_id(cm_id_priv); 3255 return -EINVAL; 3256 } 3257 3258 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3259 enum ib_wc_status wc_status) 3260 { 3261 struct cm_id_private *cm_id_priv; 3262 struct ib_cm_event cm_event; 3263 enum ib_cm_state state; 3264 int ret; 3265 3266 memset(&cm_event, 0, sizeof cm_event); 3267 cm_id_priv = msg->context[0]; 3268 3269 /* Discard old sends or ones without a response. */ 3270 spin_lock_irq(&cm_id_priv->lock); 3271 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3272 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3273 goto discard; 3274 3275 switch (state) { 3276 case IB_CM_REQ_SENT: 3277 case IB_CM_MRA_REQ_RCVD: 3278 cm_reset_to_idle(cm_id_priv); 3279 cm_event.event = IB_CM_REQ_ERROR; 3280 break; 3281 case IB_CM_REP_SENT: 3282 case IB_CM_MRA_REP_RCVD: 3283 cm_reset_to_idle(cm_id_priv); 3284 cm_event.event = IB_CM_REP_ERROR; 3285 break; 3286 case IB_CM_DREQ_SENT: 3287 cm_enter_timewait(cm_id_priv); 3288 cm_event.event = IB_CM_DREQ_ERROR; 3289 break; 3290 case IB_CM_SIDR_REQ_SENT: 3291 cm_id_priv->id.state = IB_CM_IDLE; 3292 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3293 break; 3294 default: 3295 goto discard; 3296 } 3297 spin_unlock_irq(&cm_id_priv->lock); 3298 cm_event.param.send_status = wc_status; 3299 3300 /* No other events can occur on the cm_id at this point. */ 3301 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3302 cm_free_msg(msg); 3303 if (ret) 3304 ib_destroy_cm_id(&cm_id_priv->id); 3305 return; 3306 discard: 3307 spin_unlock_irq(&cm_id_priv->lock); 3308 cm_free_msg(msg); 3309 } 3310 3311 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3312 struct ib_mad_send_wc *mad_send_wc) 3313 { 3314 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3315 struct cm_port *port; 3316 u16 attr_index; 3317 3318 port = mad_agent->context; 3319 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3320 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3321 3322 /* 3323 * If the send was in response to a received message (context[0] is not 3324 * set to a cm_id), and is not a REJ, then it is a send that was 3325 * manually retried. 3326 */ 3327 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3328 msg->retries = 1; 3329 3330 atomic_long_add(1 + msg->retries, 3331 &port->counter_group[CM_XMIT].counter[attr_index]); 3332 if (msg->retries) 3333 atomic_long_add(msg->retries, 3334 &port->counter_group[CM_XMIT_RETRIES]. 3335 counter[attr_index]); 3336 3337 switch (mad_send_wc->status) { 3338 case IB_WC_SUCCESS: 3339 case IB_WC_WR_FLUSH_ERR: 3340 cm_free_msg(msg); 3341 break; 3342 default: 3343 if (msg->context[0] && msg->context[1]) 3344 cm_process_send_error(msg, mad_send_wc->status); 3345 else 3346 cm_free_msg(msg); 3347 break; 3348 } 3349 } 3350 3351 static void cm_work_handler(struct work_struct *_work) 3352 { 3353 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3354 int ret; 3355 3356 switch (work->cm_event.event) { 3357 case IB_CM_REQ_RECEIVED: 3358 ret = cm_req_handler(work); 3359 break; 3360 case IB_CM_MRA_RECEIVED: 3361 ret = cm_mra_handler(work); 3362 break; 3363 case IB_CM_REJ_RECEIVED: 3364 ret = cm_rej_handler(work); 3365 break; 3366 case IB_CM_REP_RECEIVED: 3367 ret = cm_rep_handler(work); 3368 break; 3369 case IB_CM_RTU_RECEIVED: 3370 ret = cm_rtu_handler(work); 3371 break; 3372 case IB_CM_USER_ESTABLISHED: 3373 ret = cm_establish_handler(work); 3374 break; 3375 case IB_CM_DREQ_RECEIVED: 3376 ret = cm_dreq_handler(work); 3377 break; 3378 case IB_CM_DREP_RECEIVED: 3379 ret = cm_drep_handler(work); 3380 break; 3381 case IB_CM_SIDR_REQ_RECEIVED: 3382 ret = cm_sidr_req_handler(work); 3383 break; 3384 case IB_CM_SIDR_REP_RECEIVED: 3385 ret = cm_sidr_rep_handler(work); 3386 break; 3387 case IB_CM_LAP_RECEIVED: 3388 ret = cm_lap_handler(work); 3389 break; 3390 case IB_CM_APR_RECEIVED: 3391 ret = cm_apr_handler(work); 3392 break; 3393 case IB_CM_TIMEWAIT_EXIT: 3394 ret = cm_timewait_handler(work); 3395 break; 3396 default: 3397 ret = -EINVAL; 3398 break; 3399 } 3400 if (ret) 3401 cm_free_work(work); 3402 } 3403 3404 static int cm_establish(struct ib_cm_id *cm_id) 3405 { 3406 struct cm_id_private *cm_id_priv; 3407 struct cm_work *work; 3408 unsigned long flags; 3409 int ret = 0; 3410 struct cm_device *cm_dev; 3411 3412 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3413 if (!cm_dev) 3414 return -ENODEV; 3415 3416 work = kmalloc(sizeof *work, GFP_ATOMIC); 3417 if (!work) 3418 return -ENOMEM; 3419 3420 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3421 spin_lock_irqsave(&cm_id_priv->lock, flags); 3422 switch (cm_id->state) 3423 { 3424 case IB_CM_REP_SENT: 3425 case IB_CM_MRA_REP_RCVD: 3426 cm_id->state = IB_CM_ESTABLISHED; 3427 break; 3428 case IB_CM_ESTABLISHED: 3429 ret = -EISCONN; 3430 break; 3431 default: 3432 ret = -EINVAL; 3433 break; 3434 } 3435 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3436 3437 if (ret) { 3438 kfree(work); 3439 goto out; 3440 } 3441 3442 /* 3443 * The CM worker thread may try to destroy the cm_id before it 3444 * can execute this work item. To prevent potential deadlock, 3445 * we need to find the cm_id once we're in the context of the 3446 * worker thread, rather than holding a reference on it. 3447 */ 3448 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3449 work->local_id = cm_id->local_id; 3450 work->remote_id = cm_id->remote_id; 3451 work->mad_recv_wc = NULL; 3452 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3453 3454 /* Check if the device started its remove_one */ 3455 spin_lock_irqsave(&cm.lock, flags); 3456 if (!cm_dev->going_down) { 3457 queue_delayed_work(cm.wq, &work->work, 0); 3458 } else { 3459 kfree(work); 3460 ret = -ENODEV; 3461 } 3462 spin_unlock_irqrestore(&cm.lock, flags); 3463 3464 out: 3465 return ret; 3466 } 3467 3468 static int cm_migrate(struct ib_cm_id *cm_id) 3469 { 3470 struct cm_id_private *cm_id_priv; 3471 unsigned long flags; 3472 int ret = 0; 3473 3474 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3475 spin_lock_irqsave(&cm_id_priv->lock, flags); 3476 if (cm_id->state == IB_CM_ESTABLISHED && 3477 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3478 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3479 cm_id->lap_state = IB_CM_LAP_IDLE; 3480 cm_id_priv->av = cm_id_priv->alt_av; 3481 } else 3482 ret = -EINVAL; 3483 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3484 3485 return ret; 3486 } 3487 3488 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3489 { 3490 int ret; 3491 3492 switch (event) { 3493 case IB_EVENT_COMM_EST: 3494 ret = cm_establish(cm_id); 3495 break; 3496 case IB_EVENT_PATH_MIG: 3497 ret = cm_migrate(cm_id); 3498 break; 3499 default: 3500 ret = -EINVAL; 3501 } 3502 return ret; 3503 } 3504 EXPORT_SYMBOL(ib_cm_notify); 3505 3506 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3507 struct ib_mad_send_buf *send_buf, 3508 struct ib_mad_recv_wc *mad_recv_wc) 3509 { 3510 struct cm_port *port = mad_agent->context; 3511 struct cm_work *work; 3512 enum ib_cm_event_type event; 3513 u16 attr_id; 3514 int paths = 0; 3515 int going_down = 0; 3516 3517 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3518 case CM_REQ_ATTR_ID: 3519 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3520 alt_local_lid != 0); 3521 event = IB_CM_REQ_RECEIVED; 3522 break; 3523 case CM_MRA_ATTR_ID: 3524 event = IB_CM_MRA_RECEIVED; 3525 break; 3526 case CM_REJ_ATTR_ID: 3527 event = IB_CM_REJ_RECEIVED; 3528 break; 3529 case CM_REP_ATTR_ID: 3530 event = IB_CM_REP_RECEIVED; 3531 break; 3532 case CM_RTU_ATTR_ID: 3533 event = IB_CM_RTU_RECEIVED; 3534 break; 3535 case CM_DREQ_ATTR_ID: 3536 event = IB_CM_DREQ_RECEIVED; 3537 break; 3538 case CM_DREP_ATTR_ID: 3539 event = IB_CM_DREP_RECEIVED; 3540 break; 3541 case CM_SIDR_REQ_ATTR_ID: 3542 event = IB_CM_SIDR_REQ_RECEIVED; 3543 break; 3544 case CM_SIDR_REP_ATTR_ID: 3545 event = IB_CM_SIDR_REP_RECEIVED; 3546 break; 3547 case CM_LAP_ATTR_ID: 3548 paths = 1; 3549 event = IB_CM_LAP_RECEIVED; 3550 break; 3551 case CM_APR_ATTR_ID: 3552 event = IB_CM_APR_RECEIVED; 3553 break; 3554 default: 3555 ib_free_recv_mad(mad_recv_wc); 3556 return; 3557 } 3558 3559 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3560 atomic_long_inc(&port->counter_group[CM_RECV]. 3561 counter[attr_id - CM_ATTR_ID_OFFSET]); 3562 3563 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3564 GFP_KERNEL); 3565 if (!work) { 3566 ib_free_recv_mad(mad_recv_wc); 3567 return; 3568 } 3569 3570 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3571 work->cm_event.event = event; 3572 work->mad_recv_wc = mad_recv_wc; 3573 work->port = port; 3574 3575 /* Check if the device started its remove_one */ 3576 spin_lock_irq(&cm.lock); 3577 if (!port->cm_dev->going_down) 3578 queue_delayed_work(cm.wq, &work->work, 0); 3579 else 3580 going_down = 1; 3581 spin_unlock_irq(&cm.lock); 3582 3583 if (going_down) { 3584 kfree(work); 3585 ib_free_recv_mad(mad_recv_wc); 3586 } 3587 } 3588 3589 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3590 struct ib_qp_attr *qp_attr, 3591 int *qp_attr_mask) 3592 { 3593 unsigned long flags; 3594 int ret; 3595 3596 spin_lock_irqsave(&cm_id_priv->lock, flags); 3597 switch (cm_id_priv->id.state) { 3598 case IB_CM_REQ_SENT: 3599 case IB_CM_MRA_REQ_RCVD: 3600 case IB_CM_REQ_RCVD: 3601 case IB_CM_MRA_REQ_SENT: 3602 case IB_CM_REP_RCVD: 3603 case IB_CM_MRA_REP_SENT: 3604 case IB_CM_REP_SENT: 3605 case IB_CM_MRA_REP_RCVD: 3606 case IB_CM_ESTABLISHED: 3607 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3608 IB_QP_PKEY_INDEX | IB_QP_PORT; 3609 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3610 if (cm_id_priv->responder_resources) 3611 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3612 IB_ACCESS_REMOTE_ATOMIC; 3613 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3614 qp_attr->port_num = cm_id_priv->av.port->port_num; 3615 ret = 0; 3616 break; 3617 default: 3618 ret = -EINVAL; 3619 break; 3620 } 3621 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3622 return ret; 3623 } 3624 3625 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3626 struct ib_qp_attr *qp_attr, 3627 int *qp_attr_mask) 3628 { 3629 unsigned long flags; 3630 int ret; 3631 3632 spin_lock_irqsave(&cm_id_priv->lock, flags); 3633 switch (cm_id_priv->id.state) { 3634 case IB_CM_REQ_RCVD: 3635 case IB_CM_MRA_REQ_SENT: 3636 case IB_CM_REP_RCVD: 3637 case IB_CM_MRA_REP_SENT: 3638 case IB_CM_REP_SENT: 3639 case IB_CM_MRA_REP_RCVD: 3640 case IB_CM_ESTABLISHED: 3641 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3642 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3643 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3644 qp_attr->path_mtu = cm_id_priv->path_mtu; 3645 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3646 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3647 if (cm_id_priv->qp_type == IB_QPT_RC || 3648 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3649 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3650 IB_QP_MIN_RNR_TIMER; 3651 qp_attr->max_dest_rd_atomic = 3652 cm_id_priv->responder_resources; 3653 qp_attr->min_rnr_timer = 0; 3654 } 3655 if (cm_id_priv->alt_av.ah_attr.dlid) { 3656 *qp_attr_mask |= IB_QP_ALT_PATH; 3657 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3658 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3659 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3660 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3661 } 3662 ret = 0; 3663 break; 3664 default: 3665 ret = -EINVAL; 3666 break; 3667 } 3668 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3669 return ret; 3670 } 3671 3672 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3673 struct ib_qp_attr *qp_attr, 3674 int *qp_attr_mask) 3675 { 3676 unsigned long flags; 3677 int ret; 3678 3679 spin_lock_irqsave(&cm_id_priv->lock, flags); 3680 switch (cm_id_priv->id.state) { 3681 /* Allow transition to RTS before sending REP */ 3682 case IB_CM_REQ_RCVD: 3683 case IB_CM_MRA_REQ_SENT: 3684 3685 case IB_CM_REP_RCVD: 3686 case IB_CM_MRA_REP_SENT: 3687 case IB_CM_REP_SENT: 3688 case IB_CM_MRA_REP_RCVD: 3689 case IB_CM_ESTABLISHED: 3690 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3691 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3692 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3693 switch (cm_id_priv->qp_type) { 3694 case IB_QPT_RC: 3695 case IB_QPT_XRC_INI: 3696 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3697 IB_QP_MAX_QP_RD_ATOMIC; 3698 qp_attr->retry_cnt = cm_id_priv->retry_count; 3699 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3700 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3701 /* fall through */ 3702 case IB_QPT_XRC_TGT: 3703 *qp_attr_mask |= IB_QP_TIMEOUT; 3704 qp_attr->timeout = cm_id_priv->av.timeout; 3705 break; 3706 default: 3707 break; 3708 } 3709 if (cm_id_priv->alt_av.ah_attr.dlid) { 3710 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3711 qp_attr->path_mig_state = IB_MIG_REARM; 3712 } 3713 } else { 3714 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3715 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3716 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3717 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3718 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3719 qp_attr->path_mig_state = IB_MIG_REARM; 3720 } 3721 ret = 0; 3722 break; 3723 default: 3724 ret = -EINVAL; 3725 break; 3726 } 3727 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3728 return ret; 3729 } 3730 3731 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3732 struct ib_qp_attr *qp_attr, 3733 int *qp_attr_mask) 3734 { 3735 struct cm_id_private *cm_id_priv; 3736 int ret; 3737 3738 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3739 switch (qp_attr->qp_state) { 3740 case IB_QPS_INIT: 3741 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3742 break; 3743 case IB_QPS_RTR: 3744 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3745 break; 3746 case IB_QPS_RTS: 3747 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3748 break; 3749 default: 3750 ret = -EINVAL; 3751 break; 3752 } 3753 return ret; 3754 } 3755 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3756 3757 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3758 char *buf) 3759 { 3760 struct cm_counter_group *group; 3761 struct cm_counter_attribute *cm_attr; 3762 3763 group = container_of(obj, struct cm_counter_group, obj); 3764 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3765 3766 return sprintf(buf, "%ld\n", 3767 atomic_long_read(&group->counter[cm_attr->index])); 3768 } 3769 3770 static const struct sysfs_ops cm_counter_ops = { 3771 .show = cm_show_counter 3772 }; 3773 3774 static struct kobj_type cm_counter_obj_type = { 3775 .sysfs_ops = &cm_counter_ops, 3776 .default_attrs = cm_counter_default_attrs 3777 }; 3778 3779 static void cm_release_port_obj(struct kobject *obj) 3780 { 3781 struct cm_port *cm_port; 3782 3783 cm_port = container_of(obj, struct cm_port, port_obj); 3784 kfree(cm_port); 3785 } 3786 3787 static struct kobj_type cm_port_obj_type = { 3788 .release = cm_release_port_obj 3789 }; 3790 3791 static char *cm_devnode(struct device *dev, umode_t *mode) 3792 { 3793 if (mode) 3794 *mode = 0666; 3795 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3796 } 3797 3798 struct class cm_class = { 3799 .owner = THIS_MODULE, 3800 .name = "infiniband_cm", 3801 .devnode = cm_devnode, 3802 }; 3803 EXPORT_SYMBOL(cm_class); 3804 3805 static int cm_create_port_fs(struct cm_port *port) 3806 { 3807 int i, ret; 3808 3809 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3810 &port->cm_dev->device->kobj, 3811 "%d", port->port_num); 3812 if (ret) { 3813 kfree(port); 3814 return ret; 3815 } 3816 3817 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3818 ret = kobject_init_and_add(&port->counter_group[i].obj, 3819 &cm_counter_obj_type, 3820 &port->port_obj, 3821 "%s", counter_group_names[i]); 3822 if (ret) 3823 goto error; 3824 } 3825 3826 return 0; 3827 3828 error: 3829 while (i--) 3830 kobject_put(&port->counter_group[i].obj); 3831 kobject_put(&port->port_obj); 3832 return ret; 3833 3834 } 3835 3836 static void cm_remove_port_fs(struct cm_port *port) 3837 { 3838 int i; 3839 3840 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3841 kobject_put(&port->counter_group[i].obj); 3842 3843 kobject_put(&port->port_obj); 3844 } 3845 3846 static void cm_add_one(struct ib_device *ib_device) 3847 { 3848 struct cm_device *cm_dev; 3849 struct cm_port *port; 3850 struct ib_mad_reg_req reg_req = { 3851 .mgmt_class = IB_MGMT_CLASS_CM, 3852 .mgmt_class_version = IB_CM_CLASS_VERSION, 3853 }; 3854 struct ib_port_modify port_modify = { 3855 .set_port_cap_mask = IB_PORT_CM_SUP 3856 }; 3857 unsigned long flags; 3858 int ret; 3859 int count = 0; 3860 u8 i; 3861 3862 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3863 ib_device->phys_port_cnt, GFP_KERNEL); 3864 if (!cm_dev) 3865 return; 3866 3867 cm_dev->ib_device = ib_device; 3868 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 3869 cm_dev->going_down = 0; 3870 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3871 MKDEV(0, 0), NULL, 3872 "%s", ib_device->name); 3873 if (IS_ERR(cm_dev->device)) { 3874 kfree(cm_dev); 3875 return; 3876 } 3877 3878 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3879 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3880 if (!rdma_cap_ib_cm(ib_device, i)) 3881 continue; 3882 3883 port = kzalloc(sizeof *port, GFP_KERNEL); 3884 if (!port) 3885 goto error1; 3886 3887 cm_dev->port[i-1] = port; 3888 port->cm_dev = cm_dev; 3889 port->port_num = i; 3890 3891 ret = cm_create_port_fs(port); 3892 if (ret) 3893 goto error1; 3894 3895 port->mad_agent = ib_register_mad_agent(ib_device, i, 3896 IB_QPT_GSI, 3897 ®_req, 3898 0, 3899 cm_send_handler, 3900 cm_recv_handler, 3901 port, 3902 0); 3903 if (IS_ERR(port->mad_agent)) 3904 goto error2; 3905 3906 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3907 if (ret) 3908 goto error3; 3909 3910 count++; 3911 } 3912 3913 if (!count) 3914 goto free; 3915 3916 ib_set_client_data(ib_device, &cm_client, cm_dev); 3917 3918 write_lock_irqsave(&cm.device_lock, flags); 3919 list_add_tail(&cm_dev->list, &cm.device_list); 3920 write_unlock_irqrestore(&cm.device_lock, flags); 3921 return; 3922 3923 error3: 3924 ib_unregister_mad_agent(port->mad_agent); 3925 error2: 3926 cm_remove_port_fs(port); 3927 error1: 3928 port_modify.set_port_cap_mask = 0; 3929 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3930 while (--i) { 3931 if (!rdma_cap_ib_cm(ib_device, i)) 3932 continue; 3933 3934 port = cm_dev->port[i-1]; 3935 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3936 ib_unregister_mad_agent(port->mad_agent); 3937 cm_remove_port_fs(port); 3938 } 3939 free: 3940 device_unregister(cm_dev->device); 3941 kfree(cm_dev); 3942 } 3943 3944 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 3945 { 3946 struct cm_device *cm_dev = client_data; 3947 struct cm_port *port; 3948 struct ib_port_modify port_modify = { 3949 .clr_port_cap_mask = IB_PORT_CM_SUP 3950 }; 3951 unsigned long flags; 3952 int i; 3953 3954 if (!cm_dev) 3955 return; 3956 3957 write_lock_irqsave(&cm.device_lock, flags); 3958 list_del(&cm_dev->list); 3959 write_unlock_irqrestore(&cm.device_lock, flags); 3960 3961 spin_lock_irq(&cm.lock); 3962 cm_dev->going_down = 1; 3963 spin_unlock_irq(&cm.lock); 3964 3965 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3966 if (!rdma_cap_ib_cm(ib_device, i)) 3967 continue; 3968 3969 port = cm_dev->port[i-1]; 3970 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3971 /* 3972 * We flush the queue here after the going_down set, this 3973 * verify that no new works will be queued in the recv handler, 3974 * after that we can call the unregister_mad_agent 3975 */ 3976 flush_workqueue(cm.wq); 3977 ib_unregister_mad_agent(port->mad_agent); 3978 cm_remove_port_fs(port); 3979 } 3980 device_unregister(cm_dev->device); 3981 kfree(cm_dev); 3982 } 3983 3984 static int __init ib_cm_init(void) 3985 { 3986 int ret; 3987 3988 memset(&cm, 0, sizeof cm); 3989 INIT_LIST_HEAD(&cm.device_list); 3990 rwlock_init(&cm.device_lock); 3991 spin_lock_init(&cm.lock); 3992 cm.listen_service_table = RB_ROOT; 3993 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3994 cm.remote_id_table = RB_ROOT; 3995 cm.remote_qp_table = RB_ROOT; 3996 cm.remote_sidr_table = RB_ROOT; 3997 idr_init(&cm.local_id_table); 3998 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3999 INIT_LIST_HEAD(&cm.timewait_list); 4000 4001 ret = class_register(&cm_class); 4002 if (ret) { 4003 ret = -ENOMEM; 4004 goto error1; 4005 } 4006 4007 cm.wq = create_workqueue("ib_cm"); 4008 if (!cm.wq) { 4009 ret = -ENOMEM; 4010 goto error2; 4011 } 4012 4013 ret = ib_register_client(&cm_client); 4014 if (ret) 4015 goto error3; 4016 4017 return 0; 4018 error3: 4019 destroy_workqueue(cm.wq); 4020 error2: 4021 class_unregister(&cm_class); 4022 error1: 4023 idr_destroy(&cm.local_id_table); 4024 return ret; 4025 } 4026 4027 static void __exit ib_cm_cleanup(void) 4028 { 4029 struct cm_timewait_info *timewait_info, *tmp; 4030 4031 spin_lock_irq(&cm.lock); 4032 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4033 cancel_delayed_work(&timewait_info->work.work); 4034 spin_unlock_irq(&cm.lock); 4035 4036 ib_unregister_client(&cm_client); 4037 destroy_workqueue(cm.wq); 4038 4039 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4040 list_del(&timewait_info->list); 4041 kfree(timewait_info); 4042 } 4043 4044 class_unregister(&cm_class); 4045 idr_destroy(&cm.local_id_table); 4046 } 4047 4048 module_init(ib_cm_init); 4049 module_exit(ib_cm_cleanup); 4050 4051