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 u8 valid; 183 u8 smac[ETH_ALEN]; 184 }; 185 186 struct cm_work { 187 struct delayed_work work; 188 struct list_head list; 189 struct cm_port *port; 190 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 191 __be32 local_id; /* Established / timewait */ 192 __be32 remote_id; 193 struct ib_cm_event cm_event; 194 struct ib_sa_path_rec path[0]; 195 }; 196 197 struct cm_timewait_info { 198 struct cm_work work; /* Must be first. */ 199 struct list_head list; 200 struct rb_node remote_qp_node; 201 struct rb_node remote_id_node; 202 __be64 remote_ca_guid; 203 __be32 remote_qpn; 204 u8 inserted_remote_qp; 205 u8 inserted_remote_id; 206 }; 207 208 struct cm_id_private { 209 struct ib_cm_id id; 210 211 struct rb_node service_node; 212 struct rb_node sidr_id_node; 213 spinlock_t lock; /* Do not acquire inside cm.lock */ 214 struct completion comp; 215 atomic_t refcount; 216 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 217 * Protected by the cm.lock spinlock. */ 218 int listen_sharecount; 219 220 struct ib_mad_send_buf *msg; 221 struct cm_timewait_info *timewait_info; 222 /* todo: use alternate port on send failure */ 223 struct cm_av av; 224 struct cm_av alt_av; 225 226 void *private_data; 227 __be64 tid; 228 __be32 local_qpn; 229 __be32 remote_qpn; 230 enum ib_qp_type qp_type; 231 __be32 sq_psn; 232 __be32 rq_psn; 233 int timeout_ms; 234 enum ib_mtu path_mtu; 235 __be16 pkey; 236 u8 private_data_len; 237 u8 max_cm_retries; 238 u8 peer_to_peer; 239 u8 responder_resources; 240 u8 initiator_depth; 241 u8 retry_count; 242 u8 rnr_retry_count; 243 u8 service_timeout; 244 u8 target_ack_delay; 245 246 struct list_head work_list; 247 atomic_t work_count; 248 }; 249 250 static void cm_work_handler(struct work_struct *work); 251 252 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 253 { 254 if (atomic_dec_and_test(&cm_id_priv->refcount)) 255 complete(&cm_id_priv->comp); 256 } 257 258 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 259 struct ib_mad_send_buf **msg) 260 { 261 struct ib_mad_agent *mad_agent; 262 struct ib_mad_send_buf *m; 263 struct ib_ah *ah; 264 265 mad_agent = cm_id_priv->av.port->mad_agent; 266 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 267 if (IS_ERR(ah)) 268 return PTR_ERR(ah); 269 270 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 271 cm_id_priv->av.pkey_index, 272 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 273 GFP_ATOMIC, 274 IB_MGMT_BASE_VERSION); 275 if (IS_ERR(m)) { 276 ib_destroy_ah(ah); 277 return PTR_ERR(m); 278 } 279 280 /* Timeout set by caller if response is expected. */ 281 m->ah = ah; 282 m->retries = cm_id_priv->max_cm_retries; 283 284 atomic_inc(&cm_id_priv->refcount); 285 m->context[0] = cm_id_priv; 286 *msg = m; 287 return 0; 288 } 289 290 static int cm_alloc_response_msg(struct cm_port *port, 291 struct ib_mad_recv_wc *mad_recv_wc, 292 struct ib_mad_send_buf **msg) 293 { 294 struct ib_mad_send_buf *m; 295 struct ib_ah *ah; 296 297 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 298 mad_recv_wc->recv_buf.grh, port->port_num); 299 if (IS_ERR(ah)) 300 return PTR_ERR(ah); 301 302 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 303 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 304 GFP_ATOMIC, 305 IB_MGMT_BASE_VERSION); 306 if (IS_ERR(m)) { 307 ib_destroy_ah(ah); 308 return PTR_ERR(m); 309 } 310 m->ah = ah; 311 *msg = m; 312 return 0; 313 } 314 315 static void cm_free_msg(struct ib_mad_send_buf *msg) 316 { 317 ib_destroy_ah(msg->ah); 318 if (msg->context[0]) 319 cm_deref_id(msg->context[0]); 320 ib_free_send_mad(msg); 321 } 322 323 static void * cm_copy_private_data(const void *private_data, 324 u8 private_data_len) 325 { 326 void *data; 327 328 if (!private_data || !private_data_len) 329 return NULL; 330 331 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 332 if (!data) 333 return ERR_PTR(-ENOMEM); 334 335 return data; 336 } 337 338 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 339 void *private_data, u8 private_data_len) 340 { 341 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 342 kfree(cm_id_priv->private_data); 343 344 cm_id_priv->private_data = private_data; 345 cm_id_priv->private_data_len = private_data_len; 346 } 347 348 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 349 struct ib_grh *grh, struct cm_av *av) 350 { 351 av->port = port; 352 av->pkey_index = wc->pkey_index; 353 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 354 grh, &av->ah_attr); 355 } 356 357 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 358 { 359 struct cm_device *cm_dev; 360 struct cm_port *port = NULL; 361 unsigned long flags; 362 int ret; 363 u8 p; 364 365 read_lock_irqsave(&cm.device_lock, flags); 366 list_for_each_entry(cm_dev, &cm.device_list, list) { 367 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 368 &p, NULL)) { 369 port = cm_dev->port[p-1]; 370 break; 371 } 372 } 373 read_unlock_irqrestore(&cm.device_lock, flags); 374 375 if (!port) 376 return -EINVAL; 377 378 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 379 be16_to_cpu(path->pkey), &av->pkey_index); 380 if (ret) 381 return ret; 382 383 av->port = port; 384 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 385 &av->ah_attr); 386 av->timeout = path->packet_life_time + 1; 387 memcpy(av->smac, path->smac, sizeof(av->smac)); 388 389 av->valid = 1; 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_irq(&cm.lock); 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_irq(&cm.lock); 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 break; 839 case IB_CM_REQ_SENT: 840 case IB_CM_MRA_REQ_RCVD: 841 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 842 spin_unlock_irq(&cm_id_priv->lock); 843 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 844 &cm_id_priv->id.device->node_guid, 845 sizeof cm_id_priv->id.device->node_guid, 846 NULL, 0); 847 break; 848 case IB_CM_REQ_RCVD: 849 if (err == -ENOMEM) { 850 /* Do not reject to allow future retries. */ 851 cm_reset_to_idle(cm_id_priv); 852 spin_unlock_irq(&cm_id_priv->lock); 853 } else { 854 spin_unlock_irq(&cm_id_priv->lock); 855 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 856 NULL, 0, NULL, 0); 857 } 858 break; 859 case IB_CM_REP_SENT: 860 case IB_CM_MRA_REP_RCVD: 861 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 862 /* Fall through */ 863 case IB_CM_MRA_REQ_SENT: 864 case IB_CM_REP_RCVD: 865 case IB_CM_MRA_REP_SENT: 866 spin_unlock_irq(&cm_id_priv->lock); 867 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 868 NULL, 0, NULL, 0); 869 break; 870 case IB_CM_ESTABLISHED: 871 spin_unlock_irq(&cm_id_priv->lock); 872 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 873 break; 874 ib_send_cm_dreq(cm_id, NULL, 0); 875 goto retest; 876 case IB_CM_DREQ_SENT: 877 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 878 cm_enter_timewait(cm_id_priv); 879 spin_unlock_irq(&cm_id_priv->lock); 880 break; 881 case IB_CM_DREQ_RCVD: 882 spin_unlock_irq(&cm_id_priv->lock); 883 ib_send_cm_drep(cm_id, NULL, 0); 884 break; 885 default: 886 spin_unlock_irq(&cm_id_priv->lock); 887 break; 888 } 889 890 cm_free_id(cm_id->local_id); 891 cm_deref_id(cm_id_priv); 892 wait_for_completion(&cm_id_priv->comp); 893 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 894 cm_free_work(work); 895 kfree(cm_id_priv->private_data); 896 kfree(cm_id_priv); 897 } 898 899 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 900 { 901 cm_destroy_id(cm_id, 0); 902 } 903 EXPORT_SYMBOL(ib_destroy_cm_id); 904 905 /** 906 * __ib_cm_listen - Initiates listening on the specified service ID for 907 * connection and service ID resolution requests. 908 * @cm_id: Connection identifier associated with the listen request. 909 * @service_id: Service identifier matched against incoming connection 910 * and service ID resolution requests. The service ID should be specified 911 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 912 * assign a service ID to the caller. 913 * @service_mask: Mask applied to service ID used to listen across a 914 * range of service IDs. If set to 0, the service ID is matched 915 * exactly. This parameter is ignored if %service_id is set to 916 * IB_CM_ASSIGN_SERVICE_ID. 917 */ 918 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 919 __be64 service_mask) 920 { 921 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 922 int ret = 0; 923 924 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 925 service_id &= service_mask; 926 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 927 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 928 return -EINVAL; 929 930 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 931 if (cm_id->state != IB_CM_IDLE) 932 return -EINVAL; 933 934 cm_id->state = IB_CM_LISTEN; 935 ++cm_id_priv->listen_sharecount; 936 937 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 938 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 939 cm_id->service_mask = ~cpu_to_be64(0); 940 } else { 941 cm_id->service_id = service_id; 942 cm_id->service_mask = service_mask; 943 } 944 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 945 946 if (cur_cm_id_priv) { 947 cm_id->state = IB_CM_IDLE; 948 --cm_id_priv->listen_sharecount; 949 ret = -EBUSY; 950 } 951 return ret; 952 } 953 954 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 955 { 956 unsigned long flags; 957 int ret; 958 959 spin_lock_irqsave(&cm.lock, flags); 960 ret = __ib_cm_listen(cm_id, service_id, service_mask); 961 spin_unlock_irqrestore(&cm.lock, flags); 962 963 return ret; 964 } 965 EXPORT_SYMBOL(ib_cm_listen); 966 967 /** 968 * Create a new listening ib_cm_id and listen on the given service ID. 969 * 970 * If there's an existing ID listening on that same device and service ID, 971 * return it. 972 * 973 * @device: Device associated with the cm_id. All related communication will 974 * be associated with the specified device. 975 * @cm_handler: Callback invoked to notify the user of CM events. 976 * @service_id: Service identifier matched against incoming connection 977 * and service ID resolution requests. The service ID should be specified 978 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 979 * assign a service ID to the caller. 980 * 981 * Callers should call ib_destroy_cm_id when done with the listener ID. 982 */ 983 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 984 ib_cm_handler cm_handler, 985 __be64 service_id) 986 { 987 struct cm_id_private *cm_id_priv; 988 struct ib_cm_id *cm_id; 989 unsigned long flags; 990 int err = 0; 991 992 /* Create an ID in advance, since the creation may sleep */ 993 cm_id = ib_create_cm_id(device, cm_handler, NULL); 994 if (IS_ERR(cm_id)) 995 return cm_id; 996 997 spin_lock_irqsave(&cm.lock, flags); 998 999 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1000 goto new_id; 1001 1002 /* Find an existing ID */ 1003 cm_id_priv = cm_find_listen(device, service_id); 1004 if (cm_id_priv) { 1005 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1006 /* Sharing an ib_cm_id with different handlers is not 1007 * supported */ 1008 spin_unlock_irqrestore(&cm.lock, flags); 1009 return ERR_PTR(-EINVAL); 1010 } 1011 atomic_inc(&cm_id_priv->refcount); 1012 ++cm_id_priv->listen_sharecount; 1013 spin_unlock_irqrestore(&cm.lock, flags); 1014 1015 ib_destroy_cm_id(cm_id); 1016 cm_id = &cm_id_priv->id; 1017 return cm_id; 1018 } 1019 1020 new_id: 1021 /* Use newly created ID */ 1022 err = __ib_cm_listen(cm_id, service_id, 0); 1023 1024 spin_unlock_irqrestore(&cm.lock, flags); 1025 1026 if (err) { 1027 ib_destroy_cm_id(cm_id); 1028 return ERR_PTR(err); 1029 } 1030 return cm_id; 1031 } 1032 EXPORT_SYMBOL(ib_cm_insert_listen); 1033 1034 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1035 enum cm_msg_sequence msg_seq) 1036 { 1037 u64 hi_tid, low_tid; 1038 1039 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1040 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1041 (msg_seq << 30)); 1042 return cpu_to_be64(hi_tid | low_tid); 1043 } 1044 1045 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1046 __be16 attr_id, __be64 tid) 1047 { 1048 hdr->base_version = IB_MGMT_BASE_VERSION; 1049 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1050 hdr->class_version = IB_CM_CLASS_VERSION; 1051 hdr->method = IB_MGMT_METHOD_SEND; 1052 hdr->attr_id = attr_id; 1053 hdr->tid = tid; 1054 } 1055 1056 static void cm_format_req(struct cm_req_msg *req_msg, 1057 struct cm_id_private *cm_id_priv, 1058 struct ib_cm_req_param *param) 1059 { 1060 struct ib_sa_path_rec *pri_path = param->primary_path; 1061 struct ib_sa_path_rec *alt_path = param->alternate_path; 1062 1063 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1064 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1065 1066 req_msg->local_comm_id = cm_id_priv->id.local_id; 1067 req_msg->service_id = param->service_id; 1068 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1069 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1070 cm_req_set_init_depth(req_msg, param->initiator_depth); 1071 cm_req_set_remote_resp_timeout(req_msg, 1072 param->remote_cm_response_timeout); 1073 cm_req_set_qp_type(req_msg, param->qp_type); 1074 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1075 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1076 cm_req_set_local_resp_timeout(req_msg, 1077 param->local_cm_response_timeout); 1078 req_msg->pkey = param->primary_path->pkey; 1079 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1080 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1081 1082 if (param->qp_type != IB_QPT_XRC_INI) { 1083 cm_req_set_resp_res(req_msg, param->responder_resources); 1084 cm_req_set_retry_count(req_msg, param->retry_count); 1085 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1086 cm_req_set_srq(req_msg, param->srq); 1087 } 1088 1089 if (pri_path->hop_limit <= 1) { 1090 req_msg->primary_local_lid = pri_path->slid; 1091 req_msg->primary_remote_lid = pri_path->dlid; 1092 } else { 1093 /* Work-around until there's a way to obtain remote LID info */ 1094 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1095 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1096 } 1097 req_msg->primary_local_gid = pri_path->sgid; 1098 req_msg->primary_remote_gid = pri_path->dgid; 1099 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1100 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1101 req_msg->primary_traffic_class = pri_path->traffic_class; 1102 req_msg->primary_hop_limit = pri_path->hop_limit; 1103 cm_req_set_primary_sl(req_msg, pri_path->sl); 1104 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1105 cm_req_set_primary_local_ack_timeout(req_msg, 1106 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1107 pri_path->packet_life_time)); 1108 1109 if (alt_path) { 1110 if (alt_path->hop_limit <= 1) { 1111 req_msg->alt_local_lid = alt_path->slid; 1112 req_msg->alt_remote_lid = alt_path->dlid; 1113 } else { 1114 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1115 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1116 } 1117 req_msg->alt_local_gid = alt_path->sgid; 1118 req_msg->alt_remote_gid = alt_path->dgid; 1119 cm_req_set_alt_flow_label(req_msg, 1120 alt_path->flow_label); 1121 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1122 req_msg->alt_traffic_class = alt_path->traffic_class; 1123 req_msg->alt_hop_limit = alt_path->hop_limit; 1124 cm_req_set_alt_sl(req_msg, alt_path->sl); 1125 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1126 cm_req_set_alt_local_ack_timeout(req_msg, 1127 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1128 alt_path->packet_life_time)); 1129 } 1130 1131 if (param->private_data && param->private_data_len) 1132 memcpy(req_msg->private_data, param->private_data, 1133 param->private_data_len); 1134 } 1135 1136 static int cm_validate_req_param(struct ib_cm_req_param *param) 1137 { 1138 /* peer-to-peer not supported */ 1139 if (param->peer_to_peer) 1140 return -EINVAL; 1141 1142 if (!param->primary_path) 1143 return -EINVAL; 1144 1145 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1146 param->qp_type != IB_QPT_XRC_INI) 1147 return -EINVAL; 1148 1149 if (param->private_data && 1150 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1151 return -EINVAL; 1152 1153 if (param->alternate_path && 1154 (param->alternate_path->pkey != param->primary_path->pkey || 1155 param->alternate_path->mtu != param->primary_path->mtu)) 1156 return -EINVAL; 1157 1158 return 0; 1159 } 1160 1161 int ib_send_cm_req(struct ib_cm_id *cm_id, 1162 struct ib_cm_req_param *param) 1163 { 1164 struct cm_id_private *cm_id_priv; 1165 struct cm_req_msg *req_msg; 1166 unsigned long flags; 1167 int ret; 1168 1169 ret = cm_validate_req_param(param); 1170 if (ret) 1171 return ret; 1172 1173 /* Verify that we're not in timewait. */ 1174 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1175 spin_lock_irqsave(&cm_id_priv->lock, flags); 1176 if (cm_id->state != IB_CM_IDLE) { 1177 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1178 ret = -EINVAL; 1179 goto out; 1180 } 1181 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1182 1183 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1184 id.local_id); 1185 if (IS_ERR(cm_id_priv->timewait_info)) { 1186 ret = PTR_ERR(cm_id_priv->timewait_info); 1187 goto out; 1188 } 1189 1190 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1191 if (ret) 1192 goto error1; 1193 if (param->alternate_path) { 1194 ret = cm_init_av_by_path(param->alternate_path, 1195 &cm_id_priv->alt_av); 1196 if (ret) 1197 goto error1; 1198 } 1199 cm_id->service_id = param->service_id; 1200 cm_id->service_mask = ~cpu_to_be64(0); 1201 cm_id_priv->timeout_ms = cm_convert_to_ms( 1202 param->primary_path->packet_life_time) * 2 + 1203 cm_convert_to_ms( 1204 param->remote_cm_response_timeout); 1205 cm_id_priv->max_cm_retries = param->max_cm_retries; 1206 cm_id_priv->initiator_depth = param->initiator_depth; 1207 cm_id_priv->responder_resources = param->responder_resources; 1208 cm_id_priv->retry_count = param->retry_count; 1209 cm_id_priv->path_mtu = param->primary_path->mtu; 1210 cm_id_priv->pkey = param->primary_path->pkey; 1211 cm_id_priv->qp_type = param->qp_type; 1212 1213 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1214 if (ret) 1215 goto error1; 1216 1217 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1218 cm_format_req(req_msg, cm_id_priv, param); 1219 cm_id_priv->tid = req_msg->hdr.tid; 1220 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1221 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1222 1223 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1224 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1225 1226 spin_lock_irqsave(&cm_id_priv->lock, flags); 1227 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1228 if (ret) { 1229 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1230 goto error2; 1231 } 1232 BUG_ON(cm_id->state != IB_CM_IDLE); 1233 cm_id->state = IB_CM_REQ_SENT; 1234 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1235 return 0; 1236 1237 error2: cm_free_msg(cm_id_priv->msg); 1238 error1: kfree(cm_id_priv->timewait_info); 1239 out: return ret; 1240 } 1241 EXPORT_SYMBOL(ib_send_cm_req); 1242 1243 static int cm_issue_rej(struct cm_port *port, 1244 struct ib_mad_recv_wc *mad_recv_wc, 1245 enum ib_cm_rej_reason reason, 1246 enum cm_msg_response msg_rejected, 1247 void *ari, u8 ari_length) 1248 { 1249 struct ib_mad_send_buf *msg = NULL; 1250 struct cm_rej_msg *rej_msg, *rcv_msg; 1251 int ret; 1252 1253 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1254 if (ret) 1255 return ret; 1256 1257 /* We just need common CM header information. Cast to any message. */ 1258 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1259 rej_msg = (struct cm_rej_msg *) msg->mad; 1260 1261 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1262 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1263 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1264 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1265 rej_msg->reason = cpu_to_be16(reason); 1266 1267 if (ari && ari_length) { 1268 cm_rej_set_reject_info_len(rej_msg, ari_length); 1269 memcpy(rej_msg->ari, ari, ari_length); 1270 } 1271 1272 ret = ib_post_send_mad(msg, NULL); 1273 if (ret) 1274 cm_free_msg(msg); 1275 1276 return ret; 1277 } 1278 1279 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1280 __be32 local_qpn, __be32 remote_qpn) 1281 { 1282 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1283 ((local_ca_guid == remote_ca_guid) && 1284 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1285 } 1286 1287 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1288 struct ib_sa_path_rec *primary_path, 1289 struct ib_sa_path_rec *alt_path) 1290 { 1291 memset(primary_path, 0, sizeof *primary_path); 1292 primary_path->dgid = req_msg->primary_local_gid; 1293 primary_path->sgid = req_msg->primary_remote_gid; 1294 primary_path->dlid = req_msg->primary_local_lid; 1295 primary_path->slid = req_msg->primary_remote_lid; 1296 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1297 primary_path->hop_limit = req_msg->primary_hop_limit; 1298 primary_path->traffic_class = req_msg->primary_traffic_class; 1299 primary_path->reversible = 1; 1300 primary_path->pkey = req_msg->pkey; 1301 primary_path->sl = cm_req_get_primary_sl(req_msg); 1302 primary_path->mtu_selector = IB_SA_EQ; 1303 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1304 primary_path->rate_selector = IB_SA_EQ; 1305 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1306 primary_path->packet_life_time_selector = IB_SA_EQ; 1307 primary_path->packet_life_time = 1308 cm_req_get_primary_local_ack_timeout(req_msg); 1309 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1310 primary_path->service_id = req_msg->service_id; 1311 1312 if (req_msg->alt_local_lid) { 1313 memset(alt_path, 0, sizeof *alt_path); 1314 alt_path->dgid = req_msg->alt_local_gid; 1315 alt_path->sgid = req_msg->alt_remote_gid; 1316 alt_path->dlid = req_msg->alt_local_lid; 1317 alt_path->slid = req_msg->alt_remote_lid; 1318 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1319 alt_path->hop_limit = req_msg->alt_hop_limit; 1320 alt_path->traffic_class = req_msg->alt_traffic_class; 1321 alt_path->reversible = 1; 1322 alt_path->pkey = req_msg->pkey; 1323 alt_path->sl = cm_req_get_alt_sl(req_msg); 1324 alt_path->mtu_selector = IB_SA_EQ; 1325 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1326 alt_path->rate_selector = IB_SA_EQ; 1327 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1328 alt_path->packet_life_time_selector = IB_SA_EQ; 1329 alt_path->packet_life_time = 1330 cm_req_get_alt_local_ack_timeout(req_msg); 1331 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1332 alt_path->service_id = req_msg->service_id; 1333 } 1334 } 1335 1336 static u16 cm_get_bth_pkey(struct cm_work *work) 1337 { 1338 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1339 u8 port_num = work->port->port_num; 1340 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1341 u16 pkey; 1342 int ret; 1343 1344 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1345 if (ret) { 1346 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1347 port_num, pkey_index, ret); 1348 return 0; 1349 } 1350 1351 return pkey; 1352 } 1353 1354 static void cm_format_req_event(struct cm_work *work, 1355 struct cm_id_private *cm_id_priv, 1356 struct ib_cm_id *listen_id) 1357 { 1358 struct cm_req_msg *req_msg; 1359 struct ib_cm_req_event_param *param; 1360 1361 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1362 param = &work->cm_event.param.req_rcvd; 1363 param->listen_id = listen_id; 1364 param->bth_pkey = cm_get_bth_pkey(work); 1365 param->port = cm_id_priv->av.port->port_num; 1366 param->primary_path = &work->path[0]; 1367 if (req_msg->alt_local_lid) 1368 param->alternate_path = &work->path[1]; 1369 else 1370 param->alternate_path = NULL; 1371 param->remote_ca_guid = req_msg->local_ca_guid; 1372 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1373 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1374 param->qp_type = cm_req_get_qp_type(req_msg); 1375 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1376 param->responder_resources = cm_req_get_init_depth(req_msg); 1377 param->initiator_depth = cm_req_get_resp_res(req_msg); 1378 param->local_cm_response_timeout = 1379 cm_req_get_remote_resp_timeout(req_msg); 1380 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1381 param->remote_cm_response_timeout = 1382 cm_req_get_local_resp_timeout(req_msg); 1383 param->retry_count = cm_req_get_retry_count(req_msg); 1384 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1385 param->srq = cm_req_get_srq(req_msg); 1386 work->cm_event.private_data = &req_msg->private_data; 1387 } 1388 1389 static void cm_process_work(struct cm_id_private *cm_id_priv, 1390 struct cm_work *work) 1391 { 1392 int ret; 1393 1394 /* We will typically only have the current event to report. */ 1395 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1396 cm_free_work(work); 1397 1398 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1399 spin_lock_irq(&cm_id_priv->lock); 1400 work = cm_dequeue_work(cm_id_priv); 1401 spin_unlock_irq(&cm_id_priv->lock); 1402 BUG_ON(!work); 1403 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1404 &work->cm_event); 1405 cm_free_work(work); 1406 } 1407 cm_deref_id(cm_id_priv); 1408 if (ret) 1409 cm_destroy_id(&cm_id_priv->id, ret); 1410 } 1411 1412 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1413 struct cm_id_private *cm_id_priv, 1414 enum cm_msg_response msg_mraed, u8 service_timeout, 1415 const void *private_data, u8 private_data_len) 1416 { 1417 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1418 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1419 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1420 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1421 cm_mra_set_service_timeout(mra_msg, service_timeout); 1422 1423 if (private_data && private_data_len) 1424 memcpy(mra_msg->private_data, private_data, private_data_len); 1425 } 1426 1427 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1428 struct cm_id_private *cm_id_priv, 1429 enum ib_cm_rej_reason reason, 1430 void *ari, 1431 u8 ari_length, 1432 const void *private_data, 1433 u8 private_data_len) 1434 { 1435 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1436 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1437 1438 switch(cm_id_priv->id.state) { 1439 case IB_CM_REQ_RCVD: 1440 rej_msg->local_comm_id = 0; 1441 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1442 break; 1443 case IB_CM_MRA_REQ_SENT: 1444 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1445 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1446 break; 1447 case IB_CM_REP_RCVD: 1448 case IB_CM_MRA_REP_SENT: 1449 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1450 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1451 break; 1452 default: 1453 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1454 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1455 break; 1456 } 1457 1458 rej_msg->reason = cpu_to_be16(reason); 1459 if (ari && ari_length) { 1460 cm_rej_set_reject_info_len(rej_msg, ari_length); 1461 memcpy(rej_msg->ari, ari, ari_length); 1462 } 1463 1464 if (private_data && private_data_len) 1465 memcpy(rej_msg->private_data, private_data, private_data_len); 1466 } 1467 1468 static void cm_dup_req_handler(struct cm_work *work, 1469 struct cm_id_private *cm_id_priv) 1470 { 1471 struct ib_mad_send_buf *msg = NULL; 1472 int ret; 1473 1474 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1475 counter[CM_REQ_COUNTER]); 1476 1477 /* Quick state check to discard duplicate REQs. */ 1478 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1479 return; 1480 1481 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1482 if (ret) 1483 return; 1484 1485 spin_lock_irq(&cm_id_priv->lock); 1486 switch (cm_id_priv->id.state) { 1487 case IB_CM_MRA_REQ_SENT: 1488 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1489 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1490 cm_id_priv->private_data, 1491 cm_id_priv->private_data_len); 1492 break; 1493 case IB_CM_TIMEWAIT: 1494 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1495 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1496 break; 1497 default: 1498 goto unlock; 1499 } 1500 spin_unlock_irq(&cm_id_priv->lock); 1501 1502 ret = ib_post_send_mad(msg, NULL); 1503 if (ret) 1504 goto free; 1505 return; 1506 1507 unlock: spin_unlock_irq(&cm_id_priv->lock); 1508 free: cm_free_msg(msg); 1509 } 1510 1511 static struct cm_id_private * cm_match_req(struct cm_work *work, 1512 struct cm_id_private *cm_id_priv) 1513 { 1514 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1515 struct cm_timewait_info *timewait_info; 1516 struct cm_req_msg *req_msg; 1517 1518 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1519 1520 /* Check for possible duplicate REQ. */ 1521 spin_lock_irq(&cm.lock); 1522 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1523 if (timewait_info) { 1524 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1525 timewait_info->work.remote_id); 1526 spin_unlock_irq(&cm.lock); 1527 if (cur_cm_id_priv) { 1528 cm_dup_req_handler(work, cur_cm_id_priv); 1529 cm_deref_id(cur_cm_id_priv); 1530 } 1531 return NULL; 1532 } 1533 1534 /* Check for stale connections. */ 1535 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1536 if (timewait_info) { 1537 cm_cleanup_timewait(cm_id_priv->timewait_info); 1538 spin_unlock_irq(&cm.lock); 1539 cm_issue_rej(work->port, work->mad_recv_wc, 1540 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1541 NULL, 0); 1542 return NULL; 1543 } 1544 1545 /* Find matching listen request. */ 1546 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1547 req_msg->service_id); 1548 if (!listen_cm_id_priv) { 1549 cm_cleanup_timewait(cm_id_priv->timewait_info); 1550 spin_unlock_irq(&cm.lock); 1551 cm_issue_rej(work->port, work->mad_recv_wc, 1552 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1553 NULL, 0); 1554 goto out; 1555 } 1556 atomic_inc(&listen_cm_id_priv->refcount); 1557 atomic_inc(&cm_id_priv->refcount); 1558 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1559 atomic_inc(&cm_id_priv->work_count); 1560 spin_unlock_irq(&cm.lock); 1561 out: 1562 return listen_cm_id_priv; 1563 } 1564 1565 /* 1566 * Work-around for inter-subnet connections. If the LIDs are permissive, 1567 * we need to override the LID/SL data in the REQ with the LID information 1568 * in the work completion. 1569 */ 1570 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1571 { 1572 if (!cm_req_get_primary_subnet_local(req_msg)) { 1573 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1574 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1575 cm_req_set_primary_sl(req_msg, wc->sl); 1576 } 1577 1578 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1579 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1580 } 1581 1582 if (!cm_req_get_alt_subnet_local(req_msg)) { 1583 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1584 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1585 cm_req_set_alt_sl(req_msg, wc->sl); 1586 } 1587 1588 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1589 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1590 } 1591 } 1592 1593 static int cm_req_handler(struct cm_work *work) 1594 { 1595 struct ib_cm_id *cm_id; 1596 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1597 struct cm_req_msg *req_msg; 1598 int ret; 1599 1600 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1601 1602 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1603 if (IS_ERR(cm_id)) 1604 return PTR_ERR(cm_id); 1605 1606 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1607 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1608 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1609 work->mad_recv_wc->recv_buf.grh, 1610 &cm_id_priv->av); 1611 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1612 id.local_id); 1613 if (IS_ERR(cm_id_priv->timewait_info)) { 1614 ret = PTR_ERR(cm_id_priv->timewait_info); 1615 goto destroy; 1616 } 1617 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1618 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1619 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1620 1621 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1622 if (!listen_cm_id_priv) { 1623 ret = -EINVAL; 1624 kfree(cm_id_priv->timewait_info); 1625 goto destroy; 1626 } 1627 1628 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1629 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1630 cm_id_priv->id.service_id = req_msg->service_id; 1631 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1632 1633 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1634 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1635 1636 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1637 work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id; 1638 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1639 if (ret) { 1640 ib_get_cached_gid(work->port->cm_dev->ib_device, 1641 work->port->port_num, 0, &work->path[0].sgid); 1642 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1643 &work->path[0].sgid, sizeof work->path[0].sgid, 1644 NULL, 0); 1645 goto rejected; 1646 } 1647 if (req_msg->alt_local_lid) { 1648 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1649 if (ret) { 1650 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1651 &work->path[0].sgid, 1652 sizeof work->path[0].sgid, NULL, 0); 1653 goto rejected; 1654 } 1655 } 1656 cm_id_priv->tid = req_msg->hdr.tid; 1657 cm_id_priv->timeout_ms = cm_convert_to_ms( 1658 cm_req_get_local_resp_timeout(req_msg)); 1659 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1660 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1661 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1662 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1663 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1664 cm_id_priv->pkey = req_msg->pkey; 1665 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1666 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1667 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1668 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1669 1670 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1671 cm_process_work(cm_id_priv, work); 1672 cm_deref_id(listen_cm_id_priv); 1673 return 0; 1674 1675 rejected: 1676 atomic_dec(&cm_id_priv->refcount); 1677 cm_deref_id(listen_cm_id_priv); 1678 destroy: 1679 ib_destroy_cm_id(cm_id); 1680 return ret; 1681 } 1682 1683 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1684 struct cm_id_private *cm_id_priv, 1685 struct ib_cm_rep_param *param) 1686 { 1687 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1688 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1689 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1690 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1691 rep_msg->resp_resources = param->responder_resources; 1692 cm_rep_set_target_ack_delay(rep_msg, 1693 cm_id_priv->av.port->cm_dev->ack_delay); 1694 cm_rep_set_failover(rep_msg, param->failover_accepted); 1695 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1696 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1697 1698 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1699 rep_msg->initiator_depth = param->initiator_depth; 1700 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1701 cm_rep_set_srq(rep_msg, param->srq); 1702 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1703 } else { 1704 cm_rep_set_srq(rep_msg, 1); 1705 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1706 } 1707 1708 if (param->private_data && param->private_data_len) 1709 memcpy(rep_msg->private_data, param->private_data, 1710 param->private_data_len); 1711 } 1712 1713 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1714 struct ib_cm_rep_param *param) 1715 { 1716 struct cm_id_private *cm_id_priv; 1717 struct ib_mad_send_buf *msg; 1718 struct cm_rep_msg *rep_msg; 1719 unsigned long flags; 1720 int ret; 1721 1722 if (param->private_data && 1723 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1724 return -EINVAL; 1725 1726 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1727 spin_lock_irqsave(&cm_id_priv->lock, flags); 1728 if (cm_id->state != IB_CM_REQ_RCVD && 1729 cm_id->state != IB_CM_MRA_REQ_SENT) { 1730 ret = -EINVAL; 1731 goto out; 1732 } 1733 1734 ret = cm_alloc_msg(cm_id_priv, &msg); 1735 if (ret) 1736 goto out; 1737 1738 rep_msg = (struct cm_rep_msg *) msg->mad; 1739 cm_format_rep(rep_msg, cm_id_priv, param); 1740 msg->timeout_ms = cm_id_priv->timeout_ms; 1741 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1742 1743 ret = ib_post_send_mad(msg, NULL); 1744 if (ret) { 1745 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1746 cm_free_msg(msg); 1747 return ret; 1748 } 1749 1750 cm_id->state = IB_CM_REP_SENT; 1751 cm_id_priv->msg = msg; 1752 cm_id_priv->initiator_depth = param->initiator_depth; 1753 cm_id_priv->responder_resources = param->responder_resources; 1754 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1755 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1756 1757 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1758 return ret; 1759 } 1760 EXPORT_SYMBOL(ib_send_cm_rep); 1761 1762 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1763 struct cm_id_private *cm_id_priv, 1764 const void *private_data, 1765 u8 private_data_len) 1766 { 1767 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1768 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1769 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1770 1771 if (private_data && private_data_len) 1772 memcpy(rtu_msg->private_data, private_data, private_data_len); 1773 } 1774 1775 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1776 const void *private_data, 1777 u8 private_data_len) 1778 { 1779 struct cm_id_private *cm_id_priv; 1780 struct ib_mad_send_buf *msg; 1781 unsigned long flags; 1782 void *data; 1783 int ret; 1784 1785 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1786 return -EINVAL; 1787 1788 data = cm_copy_private_data(private_data, private_data_len); 1789 if (IS_ERR(data)) 1790 return PTR_ERR(data); 1791 1792 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1793 spin_lock_irqsave(&cm_id_priv->lock, flags); 1794 if (cm_id->state != IB_CM_REP_RCVD && 1795 cm_id->state != IB_CM_MRA_REP_SENT) { 1796 ret = -EINVAL; 1797 goto error; 1798 } 1799 1800 ret = cm_alloc_msg(cm_id_priv, &msg); 1801 if (ret) 1802 goto error; 1803 1804 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1805 private_data, private_data_len); 1806 1807 ret = ib_post_send_mad(msg, NULL); 1808 if (ret) { 1809 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1810 cm_free_msg(msg); 1811 kfree(data); 1812 return ret; 1813 } 1814 1815 cm_id->state = IB_CM_ESTABLISHED; 1816 cm_set_private_data(cm_id_priv, data, private_data_len); 1817 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1818 return 0; 1819 1820 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1821 kfree(data); 1822 return ret; 1823 } 1824 EXPORT_SYMBOL(ib_send_cm_rtu); 1825 1826 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1827 { 1828 struct cm_rep_msg *rep_msg; 1829 struct ib_cm_rep_event_param *param; 1830 1831 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1832 param = &work->cm_event.param.rep_rcvd; 1833 param->remote_ca_guid = rep_msg->local_ca_guid; 1834 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1835 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1836 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1837 param->responder_resources = rep_msg->initiator_depth; 1838 param->initiator_depth = rep_msg->resp_resources; 1839 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1840 param->failover_accepted = cm_rep_get_failover(rep_msg); 1841 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1842 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1843 param->srq = cm_rep_get_srq(rep_msg); 1844 work->cm_event.private_data = &rep_msg->private_data; 1845 } 1846 1847 static void cm_dup_rep_handler(struct cm_work *work) 1848 { 1849 struct cm_id_private *cm_id_priv; 1850 struct cm_rep_msg *rep_msg; 1851 struct ib_mad_send_buf *msg = NULL; 1852 int ret; 1853 1854 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1855 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1856 rep_msg->local_comm_id); 1857 if (!cm_id_priv) 1858 return; 1859 1860 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1861 counter[CM_REP_COUNTER]); 1862 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1863 if (ret) 1864 goto deref; 1865 1866 spin_lock_irq(&cm_id_priv->lock); 1867 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1868 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1869 cm_id_priv->private_data, 1870 cm_id_priv->private_data_len); 1871 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1872 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1873 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1874 cm_id_priv->private_data, 1875 cm_id_priv->private_data_len); 1876 else 1877 goto unlock; 1878 spin_unlock_irq(&cm_id_priv->lock); 1879 1880 ret = ib_post_send_mad(msg, NULL); 1881 if (ret) 1882 goto free; 1883 goto deref; 1884 1885 unlock: spin_unlock_irq(&cm_id_priv->lock); 1886 free: cm_free_msg(msg); 1887 deref: cm_deref_id(cm_id_priv); 1888 } 1889 1890 static int cm_rep_handler(struct cm_work *work) 1891 { 1892 struct cm_id_private *cm_id_priv; 1893 struct cm_rep_msg *rep_msg; 1894 int ret; 1895 1896 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1897 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1898 if (!cm_id_priv) { 1899 cm_dup_rep_handler(work); 1900 return -EINVAL; 1901 } 1902 1903 cm_format_rep_event(work, cm_id_priv->qp_type); 1904 1905 spin_lock_irq(&cm_id_priv->lock); 1906 switch (cm_id_priv->id.state) { 1907 case IB_CM_REQ_SENT: 1908 case IB_CM_MRA_REQ_RCVD: 1909 break; 1910 default: 1911 spin_unlock_irq(&cm_id_priv->lock); 1912 ret = -EINVAL; 1913 goto error; 1914 } 1915 1916 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1917 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1918 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1919 1920 spin_lock(&cm.lock); 1921 /* Check for duplicate REP. */ 1922 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1923 spin_unlock(&cm.lock); 1924 spin_unlock_irq(&cm_id_priv->lock); 1925 ret = -EINVAL; 1926 goto error; 1927 } 1928 /* Check for a stale connection. */ 1929 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1930 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1931 &cm.remote_id_table); 1932 cm_id_priv->timewait_info->inserted_remote_id = 0; 1933 spin_unlock(&cm.lock); 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 cm_issue_rej(work->port, work->mad_recv_wc, 1936 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1937 NULL, 0); 1938 ret = -EINVAL; 1939 goto error; 1940 } 1941 spin_unlock(&cm.lock); 1942 1943 cm_id_priv->id.state = IB_CM_REP_RCVD; 1944 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1945 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1946 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1947 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1948 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1949 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1950 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1951 cm_id_priv->av.timeout = 1952 cm_ack_timeout(cm_id_priv->target_ack_delay, 1953 cm_id_priv->av.timeout - 1); 1954 cm_id_priv->alt_av.timeout = 1955 cm_ack_timeout(cm_id_priv->target_ack_delay, 1956 cm_id_priv->alt_av.timeout - 1); 1957 1958 /* todo: handle peer_to_peer */ 1959 1960 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1961 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1962 if (!ret) 1963 list_add_tail(&work->list, &cm_id_priv->work_list); 1964 spin_unlock_irq(&cm_id_priv->lock); 1965 1966 if (ret) 1967 cm_process_work(cm_id_priv, work); 1968 else 1969 cm_deref_id(cm_id_priv); 1970 return 0; 1971 1972 error: 1973 cm_deref_id(cm_id_priv); 1974 return ret; 1975 } 1976 1977 static int cm_establish_handler(struct cm_work *work) 1978 { 1979 struct cm_id_private *cm_id_priv; 1980 int ret; 1981 1982 /* See comment in cm_establish about lookup. */ 1983 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1984 if (!cm_id_priv) 1985 return -EINVAL; 1986 1987 spin_lock_irq(&cm_id_priv->lock); 1988 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1989 spin_unlock_irq(&cm_id_priv->lock); 1990 goto out; 1991 } 1992 1993 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1994 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1995 if (!ret) 1996 list_add_tail(&work->list, &cm_id_priv->work_list); 1997 spin_unlock_irq(&cm_id_priv->lock); 1998 1999 if (ret) 2000 cm_process_work(cm_id_priv, work); 2001 else 2002 cm_deref_id(cm_id_priv); 2003 return 0; 2004 out: 2005 cm_deref_id(cm_id_priv); 2006 return -EINVAL; 2007 } 2008 2009 static int cm_rtu_handler(struct cm_work *work) 2010 { 2011 struct cm_id_private *cm_id_priv; 2012 struct cm_rtu_msg *rtu_msg; 2013 int ret; 2014 2015 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2016 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2017 rtu_msg->local_comm_id); 2018 if (!cm_id_priv) 2019 return -EINVAL; 2020 2021 work->cm_event.private_data = &rtu_msg->private_data; 2022 2023 spin_lock_irq(&cm_id_priv->lock); 2024 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2025 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2026 spin_unlock_irq(&cm_id_priv->lock); 2027 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2028 counter[CM_RTU_COUNTER]); 2029 goto out; 2030 } 2031 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2032 2033 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2034 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2035 if (!ret) 2036 list_add_tail(&work->list, &cm_id_priv->work_list); 2037 spin_unlock_irq(&cm_id_priv->lock); 2038 2039 if (ret) 2040 cm_process_work(cm_id_priv, work); 2041 else 2042 cm_deref_id(cm_id_priv); 2043 return 0; 2044 out: 2045 cm_deref_id(cm_id_priv); 2046 return -EINVAL; 2047 } 2048 2049 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2050 struct cm_id_private *cm_id_priv, 2051 const void *private_data, 2052 u8 private_data_len) 2053 { 2054 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2055 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2056 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2057 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2058 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2059 2060 if (private_data && private_data_len) 2061 memcpy(dreq_msg->private_data, private_data, private_data_len); 2062 } 2063 2064 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2065 const void *private_data, 2066 u8 private_data_len) 2067 { 2068 struct cm_id_private *cm_id_priv; 2069 struct ib_mad_send_buf *msg; 2070 unsigned long flags; 2071 int ret; 2072 2073 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2074 return -EINVAL; 2075 2076 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2077 spin_lock_irqsave(&cm_id_priv->lock, flags); 2078 if (cm_id->state != IB_CM_ESTABLISHED) { 2079 ret = -EINVAL; 2080 goto out; 2081 } 2082 2083 if (cm_id->lap_state == IB_CM_LAP_SENT || 2084 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2085 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2086 2087 ret = cm_alloc_msg(cm_id_priv, &msg); 2088 if (ret) { 2089 cm_enter_timewait(cm_id_priv); 2090 goto out; 2091 } 2092 2093 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2094 private_data, private_data_len); 2095 msg->timeout_ms = cm_id_priv->timeout_ms; 2096 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2097 2098 ret = ib_post_send_mad(msg, NULL); 2099 if (ret) { 2100 cm_enter_timewait(cm_id_priv); 2101 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2102 cm_free_msg(msg); 2103 return ret; 2104 } 2105 2106 cm_id->state = IB_CM_DREQ_SENT; 2107 cm_id_priv->msg = msg; 2108 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2109 return ret; 2110 } 2111 EXPORT_SYMBOL(ib_send_cm_dreq); 2112 2113 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2114 struct cm_id_private *cm_id_priv, 2115 const void *private_data, 2116 u8 private_data_len) 2117 { 2118 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2119 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2120 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2121 2122 if (private_data && private_data_len) 2123 memcpy(drep_msg->private_data, private_data, private_data_len); 2124 } 2125 2126 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2127 const void *private_data, 2128 u8 private_data_len) 2129 { 2130 struct cm_id_private *cm_id_priv; 2131 struct ib_mad_send_buf *msg; 2132 unsigned long flags; 2133 void *data; 2134 int ret; 2135 2136 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2137 return -EINVAL; 2138 2139 data = cm_copy_private_data(private_data, private_data_len); 2140 if (IS_ERR(data)) 2141 return PTR_ERR(data); 2142 2143 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2144 spin_lock_irqsave(&cm_id_priv->lock, flags); 2145 if (cm_id->state != IB_CM_DREQ_RCVD) { 2146 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2147 kfree(data); 2148 return -EINVAL; 2149 } 2150 2151 cm_set_private_data(cm_id_priv, data, private_data_len); 2152 cm_enter_timewait(cm_id_priv); 2153 2154 ret = cm_alloc_msg(cm_id_priv, &msg); 2155 if (ret) 2156 goto out; 2157 2158 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2159 private_data, private_data_len); 2160 2161 ret = ib_post_send_mad(msg, NULL); 2162 if (ret) { 2163 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2164 cm_free_msg(msg); 2165 return ret; 2166 } 2167 2168 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2169 return ret; 2170 } 2171 EXPORT_SYMBOL(ib_send_cm_drep); 2172 2173 static int cm_issue_drep(struct cm_port *port, 2174 struct ib_mad_recv_wc *mad_recv_wc) 2175 { 2176 struct ib_mad_send_buf *msg = NULL; 2177 struct cm_dreq_msg *dreq_msg; 2178 struct cm_drep_msg *drep_msg; 2179 int ret; 2180 2181 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2182 if (ret) 2183 return ret; 2184 2185 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2186 drep_msg = (struct cm_drep_msg *) msg->mad; 2187 2188 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2189 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2190 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2191 2192 ret = ib_post_send_mad(msg, NULL); 2193 if (ret) 2194 cm_free_msg(msg); 2195 2196 return ret; 2197 } 2198 2199 static int cm_dreq_handler(struct cm_work *work) 2200 { 2201 struct cm_id_private *cm_id_priv; 2202 struct cm_dreq_msg *dreq_msg; 2203 struct ib_mad_send_buf *msg = NULL; 2204 int ret; 2205 2206 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2207 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2208 dreq_msg->local_comm_id); 2209 if (!cm_id_priv) { 2210 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2211 counter[CM_DREQ_COUNTER]); 2212 cm_issue_drep(work->port, work->mad_recv_wc); 2213 return -EINVAL; 2214 } 2215 2216 work->cm_event.private_data = &dreq_msg->private_data; 2217 2218 spin_lock_irq(&cm_id_priv->lock); 2219 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2220 goto unlock; 2221 2222 switch (cm_id_priv->id.state) { 2223 case IB_CM_REP_SENT: 2224 case IB_CM_DREQ_SENT: 2225 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2226 break; 2227 case IB_CM_ESTABLISHED: 2228 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2229 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2230 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2231 break; 2232 case IB_CM_MRA_REP_RCVD: 2233 break; 2234 case IB_CM_TIMEWAIT: 2235 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2236 counter[CM_DREQ_COUNTER]); 2237 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2238 goto unlock; 2239 2240 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2241 cm_id_priv->private_data, 2242 cm_id_priv->private_data_len); 2243 spin_unlock_irq(&cm_id_priv->lock); 2244 2245 if (ib_post_send_mad(msg, NULL)) 2246 cm_free_msg(msg); 2247 goto deref; 2248 case IB_CM_DREQ_RCVD: 2249 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2250 counter[CM_DREQ_COUNTER]); 2251 goto unlock; 2252 default: 2253 goto unlock; 2254 } 2255 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2256 cm_id_priv->tid = dreq_msg->hdr.tid; 2257 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2258 if (!ret) 2259 list_add_tail(&work->list, &cm_id_priv->work_list); 2260 spin_unlock_irq(&cm_id_priv->lock); 2261 2262 if (ret) 2263 cm_process_work(cm_id_priv, work); 2264 else 2265 cm_deref_id(cm_id_priv); 2266 return 0; 2267 2268 unlock: spin_unlock_irq(&cm_id_priv->lock); 2269 deref: cm_deref_id(cm_id_priv); 2270 return -EINVAL; 2271 } 2272 2273 static int cm_drep_handler(struct cm_work *work) 2274 { 2275 struct cm_id_private *cm_id_priv; 2276 struct cm_drep_msg *drep_msg; 2277 int ret; 2278 2279 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2280 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2281 drep_msg->local_comm_id); 2282 if (!cm_id_priv) 2283 return -EINVAL; 2284 2285 work->cm_event.private_data = &drep_msg->private_data; 2286 2287 spin_lock_irq(&cm_id_priv->lock); 2288 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2289 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2290 spin_unlock_irq(&cm_id_priv->lock); 2291 goto out; 2292 } 2293 cm_enter_timewait(cm_id_priv); 2294 2295 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2296 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2297 if (!ret) 2298 list_add_tail(&work->list, &cm_id_priv->work_list); 2299 spin_unlock_irq(&cm_id_priv->lock); 2300 2301 if (ret) 2302 cm_process_work(cm_id_priv, work); 2303 else 2304 cm_deref_id(cm_id_priv); 2305 return 0; 2306 out: 2307 cm_deref_id(cm_id_priv); 2308 return -EINVAL; 2309 } 2310 2311 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2312 enum ib_cm_rej_reason reason, 2313 void *ari, 2314 u8 ari_length, 2315 const void *private_data, 2316 u8 private_data_len) 2317 { 2318 struct cm_id_private *cm_id_priv; 2319 struct ib_mad_send_buf *msg; 2320 unsigned long flags; 2321 int ret; 2322 2323 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2324 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2325 return -EINVAL; 2326 2327 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2328 2329 spin_lock_irqsave(&cm_id_priv->lock, flags); 2330 switch (cm_id->state) { 2331 case IB_CM_REQ_SENT: 2332 case IB_CM_MRA_REQ_RCVD: 2333 case IB_CM_REQ_RCVD: 2334 case IB_CM_MRA_REQ_SENT: 2335 case IB_CM_REP_RCVD: 2336 case IB_CM_MRA_REP_SENT: 2337 ret = cm_alloc_msg(cm_id_priv, &msg); 2338 if (!ret) 2339 cm_format_rej((struct cm_rej_msg *) msg->mad, 2340 cm_id_priv, reason, ari, ari_length, 2341 private_data, private_data_len); 2342 2343 cm_reset_to_idle(cm_id_priv); 2344 break; 2345 case IB_CM_REP_SENT: 2346 case IB_CM_MRA_REP_RCVD: 2347 ret = cm_alloc_msg(cm_id_priv, &msg); 2348 if (!ret) 2349 cm_format_rej((struct cm_rej_msg *) msg->mad, 2350 cm_id_priv, reason, ari, ari_length, 2351 private_data, private_data_len); 2352 2353 cm_enter_timewait(cm_id_priv); 2354 break; 2355 default: 2356 ret = -EINVAL; 2357 goto out; 2358 } 2359 2360 if (ret) 2361 goto out; 2362 2363 ret = ib_post_send_mad(msg, NULL); 2364 if (ret) 2365 cm_free_msg(msg); 2366 2367 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2368 return ret; 2369 } 2370 EXPORT_SYMBOL(ib_send_cm_rej); 2371 2372 static void cm_format_rej_event(struct cm_work *work) 2373 { 2374 struct cm_rej_msg *rej_msg; 2375 struct ib_cm_rej_event_param *param; 2376 2377 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2378 param = &work->cm_event.param.rej_rcvd; 2379 param->ari = rej_msg->ari; 2380 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2381 param->reason = __be16_to_cpu(rej_msg->reason); 2382 work->cm_event.private_data = &rej_msg->private_data; 2383 } 2384 2385 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2386 { 2387 struct cm_timewait_info *timewait_info; 2388 struct cm_id_private *cm_id_priv; 2389 __be32 remote_id; 2390 2391 remote_id = rej_msg->local_comm_id; 2392 2393 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2394 spin_lock_irq(&cm.lock); 2395 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2396 remote_id); 2397 if (!timewait_info) { 2398 spin_unlock_irq(&cm.lock); 2399 return NULL; 2400 } 2401 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2402 (timewait_info->work.local_id ^ 2403 cm.random_id_operand)); 2404 if (cm_id_priv) { 2405 if (cm_id_priv->id.remote_id == remote_id) 2406 atomic_inc(&cm_id_priv->refcount); 2407 else 2408 cm_id_priv = NULL; 2409 } 2410 spin_unlock_irq(&cm.lock); 2411 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2412 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2413 else 2414 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2415 2416 return cm_id_priv; 2417 } 2418 2419 static int cm_rej_handler(struct cm_work *work) 2420 { 2421 struct cm_id_private *cm_id_priv; 2422 struct cm_rej_msg *rej_msg; 2423 int ret; 2424 2425 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2426 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2427 if (!cm_id_priv) 2428 return -EINVAL; 2429 2430 cm_format_rej_event(work); 2431 2432 spin_lock_irq(&cm_id_priv->lock); 2433 switch (cm_id_priv->id.state) { 2434 case IB_CM_REQ_SENT: 2435 case IB_CM_MRA_REQ_RCVD: 2436 case IB_CM_REP_SENT: 2437 case IB_CM_MRA_REP_RCVD: 2438 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2439 /* fall through */ 2440 case IB_CM_REQ_RCVD: 2441 case IB_CM_MRA_REQ_SENT: 2442 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2443 cm_enter_timewait(cm_id_priv); 2444 else 2445 cm_reset_to_idle(cm_id_priv); 2446 break; 2447 case IB_CM_DREQ_SENT: 2448 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2449 /* fall through */ 2450 case IB_CM_REP_RCVD: 2451 case IB_CM_MRA_REP_SENT: 2452 cm_enter_timewait(cm_id_priv); 2453 break; 2454 case IB_CM_ESTABLISHED: 2455 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2456 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2457 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2458 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2459 cm_id_priv->msg); 2460 cm_enter_timewait(cm_id_priv); 2461 break; 2462 } 2463 /* fall through */ 2464 default: 2465 spin_unlock_irq(&cm_id_priv->lock); 2466 ret = -EINVAL; 2467 goto out; 2468 } 2469 2470 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2471 if (!ret) 2472 list_add_tail(&work->list, &cm_id_priv->work_list); 2473 spin_unlock_irq(&cm_id_priv->lock); 2474 2475 if (ret) 2476 cm_process_work(cm_id_priv, work); 2477 else 2478 cm_deref_id(cm_id_priv); 2479 return 0; 2480 out: 2481 cm_deref_id(cm_id_priv); 2482 return -EINVAL; 2483 } 2484 2485 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2486 u8 service_timeout, 2487 const void *private_data, 2488 u8 private_data_len) 2489 { 2490 struct cm_id_private *cm_id_priv; 2491 struct ib_mad_send_buf *msg; 2492 enum ib_cm_state cm_state; 2493 enum ib_cm_lap_state lap_state; 2494 enum cm_msg_response msg_response; 2495 void *data; 2496 unsigned long flags; 2497 int ret; 2498 2499 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2500 return -EINVAL; 2501 2502 data = cm_copy_private_data(private_data, private_data_len); 2503 if (IS_ERR(data)) 2504 return PTR_ERR(data); 2505 2506 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2507 2508 spin_lock_irqsave(&cm_id_priv->lock, flags); 2509 switch(cm_id_priv->id.state) { 2510 case IB_CM_REQ_RCVD: 2511 cm_state = IB_CM_MRA_REQ_SENT; 2512 lap_state = cm_id->lap_state; 2513 msg_response = CM_MSG_RESPONSE_REQ; 2514 break; 2515 case IB_CM_REP_RCVD: 2516 cm_state = IB_CM_MRA_REP_SENT; 2517 lap_state = cm_id->lap_state; 2518 msg_response = CM_MSG_RESPONSE_REP; 2519 break; 2520 case IB_CM_ESTABLISHED: 2521 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2522 cm_state = cm_id->state; 2523 lap_state = IB_CM_MRA_LAP_SENT; 2524 msg_response = CM_MSG_RESPONSE_OTHER; 2525 break; 2526 } 2527 default: 2528 ret = -EINVAL; 2529 goto error1; 2530 } 2531 2532 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2533 ret = cm_alloc_msg(cm_id_priv, &msg); 2534 if (ret) 2535 goto error1; 2536 2537 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2538 msg_response, service_timeout, 2539 private_data, private_data_len); 2540 ret = ib_post_send_mad(msg, NULL); 2541 if (ret) 2542 goto error2; 2543 } 2544 2545 cm_id->state = cm_state; 2546 cm_id->lap_state = lap_state; 2547 cm_id_priv->service_timeout = service_timeout; 2548 cm_set_private_data(cm_id_priv, data, private_data_len); 2549 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2550 return 0; 2551 2552 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2553 kfree(data); 2554 return ret; 2555 2556 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2557 kfree(data); 2558 cm_free_msg(msg); 2559 return ret; 2560 } 2561 EXPORT_SYMBOL(ib_send_cm_mra); 2562 2563 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2564 { 2565 switch (cm_mra_get_msg_mraed(mra_msg)) { 2566 case CM_MSG_RESPONSE_REQ: 2567 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2568 case CM_MSG_RESPONSE_REP: 2569 case CM_MSG_RESPONSE_OTHER: 2570 return cm_acquire_id(mra_msg->remote_comm_id, 2571 mra_msg->local_comm_id); 2572 default: 2573 return NULL; 2574 } 2575 } 2576 2577 static int cm_mra_handler(struct cm_work *work) 2578 { 2579 struct cm_id_private *cm_id_priv; 2580 struct cm_mra_msg *mra_msg; 2581 int timeout, ret; 2582 2583 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2584 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2585 if (!cm_id_priv) 2586 return -EINVAL; 2587 2588 work->cm_event.private_data = &mra_msg->private_data; 2589 work->cm_event.param.mra_rcvd.service_timeout = 2590 cm_mra_get_service_timeout(mra_msg); 2591 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2592 cm_convert_to_ms(cm_id_priv->av.timeout); 2593 2594 spin_lock_irq(&cm_id_priv->lock); 2595 switch (cm_id_priv->id.state) { 2596 case IB_CM_REQ_SENT: 2597 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2598 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2599 cm_id_priv->msg, timeout)) 2600 goto out; 2601 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2602 break; 2603 case IB_CM_REP_SENT: 2604 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2605 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2606 cm_id_priv->msg, timeout)) 2607 goto out; 2608 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2609 break; 2610 case IB_CM_ESTABLISHED: 2611 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2612 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2613 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2614 cm_id_priv->msg, timeout)) { 2615 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2616 atomic_long_inc(&work->port-> 2617 counter_group[CM_RECV_DUPLICATES]. 2618 counter[CM_MRA_COUNTER]); 2619 goto out; 2620 } 2621 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2622 break; 2623 case IB_CM_MRA_REQ_RCVD: 2624 case IB_CM_MRA_REP_RCVD: 2625 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2626 counter[CM_MRA_COUNTER]); 2627 /* fall through */ 2628 default: 2629 goto out; 2630 } 2631 2632 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2633 cm_id_priv->id.state; 2634 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2635 if (!ret) 2636 list_add_tail(&work->list, &cm_id_priv->work_list); 2637 spin_unlock_irq(&cm_id_priv->lock); 2638 2639 if (ret) 2640 cm_process_work(cm_id_priv, work); 2641 else 2642 cm_deref_id(cm_id_priv); 2643 return 0; 2644 out: 2645 spin_unlock_irq(&cm_id_priv->lock); 2646 cm_deref_id(cm_id_priv); 2647 return -EINVAL; 2648 } 2649 2650 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2651 struct cm_id_private *cm_id_priv, 2652 struct ib_sa_path_rec *alternate_path, 2653 const void *private_data, 2654 u8 private_data_len) 2655 { 2656 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2657 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2658 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2659 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2660 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2661 /* todo: need remote CM response timeout */ 2662 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2663 lap_msg->alt_local_lid = alternate_path->slid; 2664 lap_msg->alt_remote_lid = alternate_path->dlid; 2665 lap_msg->alt_local_gid = alternate_path->sgid; 2666 lap_msg->alt_remote_gid = alternate_path->dgid; 2667 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2668 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2669 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2670 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2671 cm_lap_set_sl(lap_msg, alternate_path->sl); 2672 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2673 cm_lap_set_local_ack_timeout(lap_msg, 2674 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2675 alternate_path->packet_life_time)); 2676 2677 if (private_data && private_data_len) 2678 memcpy(lap_msg->private_data, private_data, private_data_len); 2679 } 2680 2681 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2682 struct ib_sa_path_rec *alternate_path, 2683 const void *private_data, 2684 u8 private_data_len) 2685 { 2686 struct cm_id_private *cm_id_priv; 2687 struct ib_mad_send_buf *msg; 2688 unsigned long flags; 2689 int ret; 2690 2691 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2692 return -EINVAL; 2693 2694 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2695 spin_lock_irqsave(&cm_id_priv->lock, flags); 2696 if (cm_id->state != IB_CM_ESTABLISHED || 2697 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2698 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2699 ret = -EINVAL; 2700 goto out; 2701 } 2702 2703 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2704 if (ret) 2705 goto out; 2706 cm_id_priv->alt_av.timeout = 2707 cm_ack_timeout(cm_id_priv->target_ack_delay, 2708 cm_id_priv->alt_av.timeout - 1); 2709 2710 ret = cm_alloc_msg(cm_id_priv, &msg); 2711 if (ret) 2712 goto out; 2713 2714 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2715 alternate_path, private_data, private_data_len); 2716 msg->timeout_ms = cm_id_priv->timeout_ms; 2717 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2718 2719 ret = ib_post_send_mad(msg, NULL); 2720 if (ret) { 2721 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2722 cm_free_msg(msg); 2723 return ret; 2724 } 2725 2726 cm_id->lap_state = IB_CM_LAP_SENT; 2727 cm_id_priv->msg = msg; 2728 2729 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2730 return ret; 2731 } 2732 EXPORT_SYMBOL(ib_send_cm_lap); 2733 2734 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2735 struct ib_sa_path_rec *path, 2736 struct cm_lap_msg *lap_msg) 2737 { 2738 memset(path, 0, sizeof *path); 2739 path->dgid = lap_msg->alt_local_gid; 2740 path->sgid = lap_msg->alt_remote_gid; 2741 path->dlid = lap_msg->alt_local_lid; 2742 path->slid = lap_msg->alt_remote_lid; 2743 path->flow_label = cm_lap_get_flow_label(lap_msg); 2744 path->hop_limit = lap_msg->alt_hop_limit; 2745 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2746 path->reversible = 1; 2747 path->pkey = cm_id_priv->pkey; 2748 path->sl = cm_lap_get_sl(lap_msg); 2749 path->mtu_selector = IB_SA_EQ; 2750 path->mtu = cm_id_priv->path_mtu; 2751 path->rate_selector = IB_SA_EQ; 2752 path->rate = cm_lap_get_packet_rate(lap_msg); 2753 path->packet_life_time_selector = IB_SA_EQ; 2754 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2755 path->packet_life_time -= (path->packet_life_time > 0); 2756 } 2757 2758 static int cm_lap_handler(struct cm_work *work) 2759 { 2760 struct cm_id_private *cm_id_priv; 2761 struct cm_lap_msg *lap_msg; 2762 struct ib_cm_lap_event_param *param; 2763 struct ib_mad_send_buf *msg = NULL; 2764 int ret; 2765 2766 /* todo: verify LAP request and send reject APR if invalid. */ 2767 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2768 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2769 lap_msg->local_comm_id); 2770 if (!cm_id_priv) 2771 return -EINVAL; 2772 2773 param = &work->cm_event.param.lap_rcvd; 2774 param->alternate_path = &work->path[0]; 2775 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2776 work->cm_event.private_data = &lap_msg->private_data; 2777 2778 spin_lock_irq(&cm_id_priv->lock); 2779 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2780 goto unlock; 2781 2782 switch (cm_id_priv->id.lap_state) { 2783 case IB_CM_LAP_UNINIT: 2784 case IB_CM_LAP_IDLE: 2785 break; 2786 case IB_CM_MRA_LAP_SENT: 2787 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2788 counter[CM_LAP_COUNTER]); 2789 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2790 goto unlock; 2791 2792 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2793 CM_MSG_RESPONSE_OTHER, 2794 cm_id_priv->service_timeout, 2795 cm_id_priv->private_data, 2796 cm_id_priv->private_data_len); 2797 spin_unlock_irq(&cm_id_priv->lock); 2798 2799 if (ib_post_send_mad(msg, NULL)) 2800 cm_free_msg(msg); 2801 goto deref; 2802 case IB_CM_LAP_RCVD: 2803 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2804 counter[CM_LAP_COUNTER]); 2805 goto unlock; 2806 default: 2807 goto unlock; 2808 } 2809 2810 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2811 cm_id_priv->tid = lap_msg->hdr.tid; 2812 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2813 work->mad_recv_wc->recv_buf.grh, 2814 &cm_id_priv->av); 2815 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2816 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2817 if (!ret) 2818 list_add_tail(&work->list, &cm_id_priv->work_list); 2819 spin_unlock_irq(&cm_id_priv->lock); 2820 2821 if (ret) 2822 cm_process_work(cm_id_priv, work); 2823 else 2824 cm_deref_id(cm_id_priv); 2825 return 0; 2826 2827 unlock: spin_unlock_irq(&cm_id_priv->lock); 2828 deref: cm_deref_id(cm_id_priv); 2829 return -EINVAL; 2830 } 2831 2832 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2833 struct cm_id_private *cm_id_priv, 2834 enum ib_cm_apr_status status, 2835 void *info, 2836 u8 info_length, 2837 const void *private_data, 2838 u8 private_data_len) 2839 { 2840 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2841 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2842 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2843 apr_msg->ap_status = (u8) status; 2844 2845 if (info && info_length) { 2846 apr_msg->info_length = info_length; 2847 memcpy(apr_msg->info, info, info_length); 2848 } 2849 2850 if (private_data && private_data_len) 2851 memcpy(apr_msg->private_data, private_data, private_data_len); 2852 } 2853 2854 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2855 enum ib_cm_apr_status status, 2856 void *info, 2857 u8 info_length, 2858 const void *private_data, 2859 u8 private_data_len) 2860 { 2861 struct cm_id_private *cm_id_priv; 2862 struct ib_mad_send_buf *msg; 2863 unsigned long flags; 2864 int ret; 2865 2866 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2867 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2868 return -EINVAL; 2869 2870 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2871 spin_lock_irqsave(&cm_id_priv->lock, flags); 2872 if (cm_id->state != IB_CM_ESTABLISHED || 2873 (cm_id->lap_state != IB_CM_LAP_RCVD && 2874 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2875 ret = -EINVAL; 2876 goto out; 2877 } 2878 2879 ret = cm_alloc_msg(cm_id_priv, &msg); 2880 if (ret) 2881 goto out; 2882 2883 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2884 info, info_length, private_data, private_data_len); 2885 ret = ib_post_send_mad(msg, NULL); 2886 if (ret) { 2887 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2888 cm_free_msg(msg); 2889 return ret; 2890 } 2891 2892 cm_id->lap_state = IB_CM_LAP_IDLE; 2893 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2894 return ret; 2895 } 2896 EXPORT_SYMBOL(ib_send_cm_apr); 2897 2898 static int cm_apr_handler(struct cm_work *work) 2899 { 2900 struct cm_id_private *cm_id_priv; 2901 struct cm_apr_msg *apr_msg; 2902 int ret; 2903 2904 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2905 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2906 apr_msg->local_comm_id); 2907 if (!cm_id_priv) 2908 return -EINVAL; /* Unmatched reply. */ 2909 2910 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2911 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2912 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2913 work->cm_event.private_data = &apr_msg->private_data; 2914 2915 spin_lock_irq(&cm_id_priv->lock); 2916 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2917 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2918 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2919 spin_unlock_irq(&cm_id_priv->lock); 2920 goto out; 2921 } 2922 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2923 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2924 cm_id_priv->msg = NULL; 2925 2926 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2927 if (!ret) 2928 list_add_tail(&work->list, &cm_id_priv->work_list); 2929 spin_unlock_irq(&cm_id_priv->lock); 2930 2931 if (ret) 2932 cm_process_work(cm_id_priv, work); 2933 else 2934 cm_deref_id(cm_id_priv); 2935 return 0; 2936 out: 2937 cm_deref_id(cm_id_priv); 2938 return -EINVAL; 2939 } 2940 2941 static int cm_timewait_handler(struct cm_work *work) 2942 { 2943 struct cm_timewait_info *timewait_info; 2944 struct cm_id_private *cm_id_priv; 2945 int ret; 2946 2947 timewait_info = (struct cm_timewait_info *)work; 2948 spin_lock_irq(&cm.lock); 2949 list_del(&timewait_info->list); 2950 spin_unlock_irq(&cm.lock); 2951 2952 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2953 timewait_info->work.remote_id); 2954 if (!cm_id_priv) 2955 return -EINVAL; 2956 2957 spin_lock_irq(&cm_id_priv->lock); 2958 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2959 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2960 spin_unlock_irq(&cm_id_priv->lock); 2961 goto out; 2962 } 2963 cm_id_priv->id.state = IB_CM_IDLE; 2964 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2965 if (!ret) 2966 list_add_tail(&work->list, &cm_id_priv->work_list); 2967 spin_unlock_irq(&cm_id_priv->lock); 2968 2969 if (ret) 2970 cm_process_work(cm_id_priv, work); 2971 else 2972 cm_deref_id(cm_id_priv); 2973 return 0; 2974 out: 2975 cm_deref_id(cm_id_priv); 2976 return -EINVAL; 2977 } 2978 2979 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2980 struct cm_id_private *cm_id_priv, 2981 struct ib_cm_sidr_req_param *param) 2982 { 2983 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2984 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2985 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2986 sidr_req_msg->pkey = param->path->pkey; 2987 sidr_req_msg->service_id = param->service_id; 2988 2989 if (param->private_data && param->private_data_len) 2990 memcpy(sidr_req_msg->private_data, param->private_data, 2991 param->private_data_len); 2992 } 2993 2994 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2995 struct ib_cm_sidr_req_param *param) 2996 { 2997 struct cm_id_private *cm_id_priv; 2998 struct ib_mad_send_buf *msg; 2999 unsigned long flags; 3000 int ret; 3001 3002 if (!param->path || (param->private_data && 3003 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3004 return -EINVAL; 3005 3006 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3007 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 3008 if (ret) 3009 goto out; 3010 3011 cm_id->service_id = param->service_id; 3012 cm_id->service_mask = ~cpu_to_be64(0); 3013 cm_id_priv->timeout_ms = param->timeout_ms; 3014 cm_id_priv->max_cm_retries = param->max_cm_retries; 3015 ret = cm_alloc_msg(cm_id_priv, &msg); 3016 if (ret) 3017 goto out; 3018 3019 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3020 param); 3021 msg->timeout_ms = cm_id_priv->timeout_ms; 3022 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3023 3024 spin_lock_irqsave(&cm_id_priv->lock, flags); 3025 if (cm_id->state == IB_CM_IDLE) 3026 ret = ib_post_send_mad(msg, NULL); 3027 else 3028 ret = -EINVAL; 3029 3030 if (ret) { 3031 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3032 cm_free_msg(msg); 3033 goto out; 3034 } 3035 cm_id->state = IB_CM_SIDR_REQ_SENT; 3036 cm_id_priv->msg = msg; 3037 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3038 out: 3039 return ret; 3040 } 3041 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3042 3043 static void cm_format_sidr_req_event(struct cm_work *work, 3044 struct ib_cm_id *listen_id) 3045 { 3046 struct cm_sidr_req_msg *sidr_req_msg; 3047 struct ib_cm_sidr_req_event_param *param; 3048 3049 sidr_req_msg = (struct cm_sidr_req_msg *) 3050 work->mad_recv_wc->recv_buf.mad; 3051 param = &work->cm_event.param.sidr_req_rcvd; 3052 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3053 param->listen_id = listen_id; 3054 param->service_id = sidr_req_msg->service_id; 3055 param->bth_pkey = cm_get_bth_pkey(work); 3056 param->port = work->port->port_num; 3057 work->cm_event.private_data = &sidr_req_msg->private_data; 3058 } 3059 3060 static int cm_sidr_req_handler(struct cm_work *work) 3061 { 3062 struct ib_cm_id *cm_id; 3063 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3064 struct cm_sidr_req_msg *sidr_req_msg; 3065 struct ib_wc *wc; 3066 3067 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3068 if (IS_ERR(cm_id)) 3069 return PTR_ERR(cm_id); 3070 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3071 3072 /* Record SGID/SLID and request ID for lookup. */ 3073 sidr_req_msg = (struct cm_sidr_req_msg *) 3074 work->mad_recv_wc->recv_buf.mad; 3075 wc = work->mad_recv_wc->wc; 3076 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3077 cm_id_priv->av.dgid.global.interface_id = 0; 3078 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3079 work->mad_recv_wc->recv_buf.grh, 3080 &cm_id_priv->av); 3081 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3082 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3083 atomic_inc(&cm_id_priv->work_count); 3084 3085 spin_lock_irq(&cm.lock); 3086 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3087 if (cur_cm_id_priv) { 3088 spin_unlock_irq(&cm.lock); 3089 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3090 counter[CM_SIDR_REQ_COUNTER]); 3091 goto out; /* Duplicate message. */ 3092 } 3093 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3094 cur_cm_id_priv = cm_find_listen(cm_id->device, 3095 sidr_req_msg->service_id); 3096 if (!cur_cm_id_priv) { 3097 spin_unlock_irq(&cm.lock); 3098 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3099 goto out; /* No match. */ 3100 } 3101 atomic_inc(&cur_cm_id_priv->refcount); 3102 atomic_inc(&cm_id_priv->refcount); 3103 spin_unlock_irq(&cm.lock); 3104 3105 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3106 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3107 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3108 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3109 3110 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3111 cm_process_work(cm_id_priv, work); 3112 cm_deref_id(cur_cm_id_priv); 3113 return 0; 3114 out: 3115 ib_destroy_cm_id(&cm_id_priv->id); 3116 return -EINVAL; 3117 } 3118 3119 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3120 struct cm_id_private *cm_id_priv, 3121 struct ib_cm_sidr_rep_param *param) 3122 { 3123 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3124 cm_id_priv->tid); 3125 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3126 sidr_rep_msg->status = param->status; 3127 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3128 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3129 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3130 3131 if (param->info && param->info_length) 3132 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3133 3134 if (param->private_data && param->private_data_len) 3135 memcpy(sidr_rep_msg->private_data, param->private_data, 3136 param->private_data_len); 3137 } 3138 3139 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3140 struct ib_cm_sidr_rep_param *param) 3141 { 3142 struct cm_id_private *cm_id_priv; 3143 struct ib_mad_send_buf *msg; 3144 unsigned long flags; 3145 int ret; 3146 3147 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3148 (param->private_data && 3149 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3150 return -EINVAL; 3151 3152 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3153 spin_lock_irqsave(&cm_id_priv->lock, flags); 3154 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3155 ret = -EINVAL; 3156 goto error; 3157 } 3158 3159 ret = cm_alloc_msg(cm_id_priv, &msg); 3160 if (ret) 3161 goto error; 3162 3163 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3164 param); 3165 ret = ib_post_send_mad(msg, NULL); 3166 if (ret) { 3167 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3168 cm_free_msg(msg); 3169 return ret; 3170 } 3171 cm_id->state = IB_CM_IDLE; 3172 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3173 3174 spin_lock_irqsave(&cm.lock, flags); 3175 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3176 spin_unlock_irqrestore(&cm.lock, flags); 3177 return 0; 3178 3179 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3180 return ret; 3181 } 3182 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3183 3184 static void cm_format_sidr_rep_event(struct cm_work *work) 3185 { 3186 struct cm_sidr_rep_msg *sidr_rep_msg; 3187 struct ib_cm_sidr_rep_event_param *param; 3188 3189 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3190 work->mad_recv_wc->recv_buf.mad; 3191 param = &work->cm_event.param.sidr_rep_rcvd; 3192 param->status = sidr_rep_msg->status; 3193 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3194 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3195 param->info = &sidr_rep_msg->info; 3196 param->info_len = sidr_rep_msg->info_length; 3197 work->cm_event.private_data = &sidr_rep_msg->private_data; 3198 } 3199 3200 static int cm_sidr_rep_handler(struct cm_work *work) 3201 { 3202 struct cm_sidr_rep_msg *sidr_rep_msg; 3203 struct cm_id_private *cm_id_priv; 3204 3205 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3206 work->mad_recv_wc->recv_buf.mad; 3207 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3208 if (!cm_id_priv) 3209 return -EINVAL; /* Unmatched reply. */ 3210 3211 spin_lock_irq(&cm_id_priv->lock); 3212 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3213 spin_unlock_irq(&cm_id_priv->lock); 3214 goto out; 3215 } 3216 cm_id_priv->id.state = IB_CM_IDLE; 3217 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3218 spin_unlock_irq(&cm_id_priv->lock); 3219 3220 cm_format_sidr_rep_event(work); 3221 cm_process_work(cm_id_priv, work); 3222 return 0; 3223 out: 3224 cm_deref_id(cm_id_priv); 3225 return -EINVAL; 3226 } 3227 3228 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3229 enum ib_wc_status wc_status) 3230 { 3231 struct cm_id_private *cm_id_priv; 3232 struct ib_cm_event cm_event; 3233 enum ib_cm_state state; 3234 int ret; 3235 3236 memset(&cm_event, 0, sizeof cm_event); 3237 cm_id_priv = msg->context[0]; 3238 3239 /* Discard old sends or ones without a response. */ 3240 spin_lock_irq(&cm_id_priv->lock); 3241 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3242 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3243 goto discard; 3244 3245 switch (state) { 3246 case IB_CM_REQ_SENT: 3247 case IB_CM_MRA_REQ_RCVD: 3248 cm_reset_to_idle(cm_id_priv); 3249 cm_event.event = IB_CM_REQ_ERROR; 3250 break; 3251 case IB_CM_REP_SENT: 3252 case IB_CM_MRA_REP_RCVD: 3253 cm_reset_to_idle(cm_id_priv); 3254 cm_event.event = IB_CM_REP_ERROR; 3255 break; 3256 case IB_CM_DREQ_SENT: 3257 cm_enter_timewait(cm_id_priv); 3258 cm_event.event = IB_CM_DREQ_ERROR; 3259 break; 3260 case IB_CM_SIDR_REQ_SENT: 3261 cm_id_priv->id.state = IB_CM_IDLE; 3262 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3263 break; 3264 default: 3265 goto discard; 3266 } 3267 spin_unlock_irq(&cm_id_priv->lock); 3268 cm_event.param.send_status = wc_status; 3269 3270 /* No other events can occur on the cm_id at this point. */ 3271 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3272 cm_free_msg(msg); 3273 if (ret) 3274 ib_destroy_cm_id(&cm_id_priv->id); 3275 return; 3276 discard: 3277 spin_unlock_irq(&cm_id_priv->lock); 3278 cm_free_msg(msg); 3279 } 3280 3281 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3282 struct ib_mad_send_wc *mad_send_wc) 3283 { 3284 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3285 struct cm_port *port; 3286 u16 attr_index; 3287 3288 port = mad_agent->context; 3289 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3290 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3291 3292 /* 3293 * If the send was in response to a received message (context[0] is not 3294 * set to a cm_id), and is not a REJ, then it is a send that was 3295 * manually retried. 3296 */ 3297 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3298 msg->retries = 1; 3299 3300 atomic_long_add(1 + msg->retries, 3301 &port->counter_group[CM_XMIT].counter[attr_index]); 3302 if (msg->retries) 3303 atomic_long_add(msg->retries, 3304 &port->counter_group[CM_XMIT_RETRIES]. 3305 counter[attr_index]); 3306 3307 switch (mad_send_wc->status) { 3308 case IB_WC_SUCCESS: 3309 case IB_WC_WR_FLUSH_ERR: 3310 cm_free_msg(msg); 3311 break; 3312 default: 3313 if (msg->context[0] && msg->context[1]) 3314 cm_process_send_error(msg, mad_send_wc->status); 3315 else 3316 cm_free_msg(msg); 3317 break; 3318 } 3319 } 3320 3321 static void cm_work_handler(struct work_struct *_work) 3322 { 3323 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3324 int ret; 3325 3326 switch (work->cm_event.event) { 3327 case IB_CM_REQ_RECEIVED: 3328 ret = cm_req_handler(work); 3329 break; 3330 case IB_CM_MRA_RECEIVED: 3331 ret = cm_mra_handler(work); 3332 break; 3333 case IB_CM_REJ_RECEIVED: 3334 ret = cm_rej_handler(work); 3335 break; 3336 case IB_CM_REP_RECEIVED: 3337 ret = cm_rep_handler(work); 3338 break; 3339 case IB_CM_RTU_RECEIVED: 3340 ret = cm_rtu_handler(work); 3341 break; 3342 case IB_CM_USER_ESTABLISHED: 3343 ret = cm_establish_handler(work); 3344 break; 3345 case IB_CM_DREQ_RECEIVED: 3346 ret = cm_dreq_handler(work); 3347 break; 3348 case IB_CM_DREP_RECEIVED: 3349 ret = cm_drep_handler(work); 3350 break; 3351 case IB_CM_SIDR_REQ_RECEIVED: 3352 ret = cm_sidr_req_handler(work); 3353 break; 3354 case IB_CM_SIDR_REP_RECEIVED: 3355 ret = cm_sidr_rep_handler(work); 3356 break; 3357 case IB_CM_LAP_RECEIVED: 3358 ret = cm_lap_handler(work); 3359 break; 3360 case IB_CM_APR_RECEIVED: 3361 ret = cm_apr_handler(work); 3362 break; 3363 case IB_CM_TIMEWAIT_EXIT: 3364 ret = cm_timewait_handler(work); 3365 break; 3366 default: 3367 ret = -EINVAL; 3368 break; 3369 } 3370 if (ret) 3371 cm_free_work(work); 3372 } 3373 3374 static int cm_establish(struct ib_cm_id *cm_id) 3375 { 3376 struct cm_id_private *cm_id_priv; 3377 struct cm_work *work; 3378 unsigned long flags; 3379 int ret = 0; 3380 struct cm_device *cm_dev; 3381 3382 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3383 if (!cm_dev) 3384 return -ENODEV; 3385 3386 work = kmalloc(sizeof *work, GFP_ATOMIC); 3387 if (!work) 3388 return -ENOMEM; 3389 3390 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3391 spin_lock_irqsave(&cm_id_priv->lock, flags); 3392 switch (cm_id->state) 3393 { 3394 case IB_CM_REP_SENT: 3395 case IB_CM_MRA_REP_RCVD: 3396 cm_id->state = IB_CM_ESTABLISHED; 3397 break; 3398 case IB_CM_ESTABLISHED: 3399 ret = -EISCONN; 3400 break; 3401 default: 3402 ret = -EINVAL; 3403 break; 3404 } 3405 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3406 3407 if (ret) { 3408 kfree(work); 3409 goto out; 3410 } 3411 3412 /* 3413 * The CM worker thread may try to destroy the cm_id before it 3414 * can execute this work item. To prevent potential deadlock, 3415 * we need to find the cm_id once we're in the context of the 3416 * worker thread, rather than holding a reference on it. 3417 */ 3418 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3419 work->local_id = cm_id->local_id; 3420 work->remote_id = cm_id->remote_id; 3421 work->mad_recv_wc = NULL; 3422 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3423 3424 /* Check if the device started its remove_one */ 3425 spin_lock_irq(&cm.lock); 3426 if (!cm_dev->going_down) { 3427 queue_delayed_work(cm.wq, &work->work, 0); 3428 } else { 3429 kfree(work); 3430 ret = -ENODEV; 3431 } 3432 spin_unlock_irq(&cm.lock); 3433 3434 out: 3435 return ret; 3436 } 3437 3438 static int cm_migrate(struct ib_cm_id *cm_id) 3439 { 3440 struct cm_id_private *cm_id_priv; 3441 unsigned long flags; 3442 int ret = 0; 3443 3444 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3445 spin_lock_irqsave(&cm_id_priv->lock, flags); 3446 if (cm_id->state == IB_CM_ESTABLISHED && 3447 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3448 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3449 cm_id->lap_state = IB_CM_LAP_IDLE; 3450 cm_id_priv->av = cm_id_priv->alt_av; 3451 } else 3452 ret = -EINVAL; 3453 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3454 3455 return ret; 3456 } 3457 3458 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3459 { 3460 int ret; 3461 3462 switch (event) { 3463 case IB_EVENT_COMM_EST: 3464 ret = cm_establish(cm_id); 3465 break; 3466 case IB_EVENT_PATH_MIG: 3467 ret = cm_migrate(cm_id); 3468 break; 3469 default: 3470 ret = -EINVAL; 3471 } 3472 return ret; 3473 } 3474 EXPORT_SYMBOL(ib_cm_notify); 3475 3476 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3477 struct ib_mad_recv_wc *mad_recv_wc) 3478 { 3479 struct cm_port *port = mad_agent->context; 3480 struct cm_work *work; 3481 enum ib_cm_event_type event; 3482 u16 attr_id; 3483 int paths = 0; 3484 int going_down = 0; 3485 3486 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3487 case CM_REQ_ATTR_ID: 3488 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3489 alt_local_lid != 0); 3490 event = IB_CM_REQ_RECEIVED; 3491 break; 3492 case CM_MRA_ATTR_ID: 3493 event = IB_CM_MRA_RECEIVED; 3494 break; 3495 case CM_REJ_ATTR_ID: 3496 event = IB_CM_REJ_RECEIVED; 3497 break; 3498 case CM_REP_ATTR_ID: 3499 event = IB_CM_REP_RECEIVED; 3500 break; 3501 case CM_RTU_ATTR_ID: 3502 event = IB_CM_RTU_RECEIVED; 3503 break; 3504 case CM_DREQ_ATTR_ID: 3505 event = IB_CM_DREQ_RECEIVED; 3506 break; 3507 case CM_DREP_ATTR_ID: 3508 event = IB_CM_DREP_RECEIVED; 3509 break; 3510 case CM_SIDR_REQ_ATTR_ID: 3511 event = IB_CM_SIDR_REQ_RECEIVED; 3512 break; 3513 case CM_SIDR_REP_ATTR_ID: 3514 event = IB_CM_SIDR_REP_RECEIVED; 3515 break; 3516 case CM_LAP_ATTR_ID: 3517 paths = 1; 3518 event = IB_CM_LAP_RECEIVED; 3519 break; 3520 case CM_APR_ATTR_ID: 3521 event = IB_CM_APR_RECEIVED; 3522 break; 3523 default: 3524 ib_free_recv_mad(mad_recv_wc); 3525 return; 3526 } 3527 3528 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3529 atomic_long_inc(&port->counter_group[CM_RECV]. 3530 counter[attr_id - CM_ATTR_ID_OFFSET]); 3531 3532 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3533 GFP_KERNEL); 3534 if (!work) { 3535 ib_free_recv_mad(mad_recv_wc); 3536 return; 3537 } 3538 3539 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3540 work->cm_event.event = event; 3541 work->mad_recv_wc = mad_recv_wc; 3542 work->port = port; 3543 3544 /* Check if the device started its remove_one */ 3545 spin_lock_irq(&cm.lock); 3546 if (!port->cm_dev->going_down) 3547 queue_delayed_work(cm.wq, &work->work, 0); 3548 else 3549 going_down = 1; 3550 spin_unlock_irq(&cm.lock); 3551 3552 if (going_down) { 3553 kfree(work); 3554 ib_free_recv_mad(mad_recv_wc); 3555 } 3556 } 3557 3558 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3559 struct ib_qp_attr *qp_attr, 3560 int *qp_attr_mask) 3561 { 3562 unsigned long flags; 3563 int ret; 3564 3565 spin_lock_irqsave(&cm_id_priv->lock, flags); 3566 switch (cm_id_priv->id.state) { 3567 case IB_CM_REQ_SENT: 3568 case IB_CM_MRA_REQ_RCVD: 3569 case IB_CM_REQ_RCVD: 3570 case IB_CM_MRA_REQ_SENT: 3571 case IB_CM_REP_RCVD: 3572 case IB_CM_MRA_REP_SENT: 3573 case IB_CM_REP_SENT: 3574 case IB_CM_MRA_REP_RCVD: 3575 case IB_CM_ESTABLISHED: 3576 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3577 IB_QP_PKEY_INDEX | IB_QP_PORT; 3578 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3579 if (cm_id_priv->responder_resources) 3580 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3581 IB_ACCESS_REMOTE_ATOMIC; 3582 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3583 qp_attr->port_num = cm_id_priv->av.port->port_num; 3584 ret = 0; 3585 break; 3586 default: 3587 ret = -EINVAL; 3588 break; 3589 } 3590 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3591 return ret; 3592 } 3593 3594 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3595 struct ib_qp_attr *qp_attr, 3596 int *qp_attr_mask) 3597 { 3598 unsigned long flags; 3599 int ret; 3600 3601 spin_lock_irqsave(&cm_id_priv->lock, flags); 3602 switch (cm_id_priv->id.state) { 3603 case IB_CM_REQ_RCVD: 3604 case IB_CM_MRA_REQ_SENT: 3605 case IB_CM_REP_RCVD: 3606 case IB_CM_MRA_REP_SENT: 3607 case IB_CM_REP_SENT: 3608 case IB_CM_MRA_REP_RCVD: 3609 case IB_CM_ESTABLISHED: 3610 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3611 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3612 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3613 if (!cm_id_priv->av.valid) { 3614 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3615 return -EINVAL; 3616 } 3617 if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) { 3618 qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id; 3619 *qp_attr_mask |= IB_QP_VID; 3620 } 3621 if (!is_zero_ether_addr(cm_id_priv->av.smac)) { 3622 memcpy(qp_attr->smac, cm_id_priv->av.smac, 3623 sizeof(qp_attr->smac)); 3624 *qp_attr_mask |= IB_QP_SMAC; 3625 } 3626 if (cm_id_priv->alt_av.valid) { 3627 if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) { 3628 qp_attr->alt_vlan_id = 3629 cm_id_priv->alt_av.ah_attr.vlan_id; 3630 *qp_attr_mask |= IB_QP_ALT_VID; 3631 } 3632 if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) { 3633 memcpy(qp_attr->alt_smac, 3634 cm_id_priv->alt_av.smac, 3635 sizeof(qp_attr->alt_smac)); 3636 *qp_attr_mask |= IB_QP_ALT_SMAC; 3637 } 3638 } 3639 qp_attr->path_mtu = cm_id_priv->path_mtu; 3640 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3641 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3642 if (cm_id_priv->qp_type == IB_QPT_RC || 3643 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3644 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3645 IB_QP_MIN_RNR_TIMER; 3646 qp_attr->max_dest_rd_atomic = 3647 cm_id_priv->responder_resources; 3648 qp_attr->min_rnr_timer = 0; 3649 } 3650 if (cm_id_priv->alt_av.ah_attr.dlid) { 3651 *qp_attr_mask |= IB_QP_ALT_PATH; 3652 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3653 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3654 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3655 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3656 } 3657 ret = 0; 3658 break; 3659 default: 3660 ret = -EINVAL; 3661 break; 3662 } 3663 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3664 return ret; 3665 } 3666 3667 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3668 struct ib_qp_attr *qp_attr, 3669 int *qp_attr_mask) 3670 { 3671 unsigned long flags; 3672 int ret; 3673 3674 spin_lock_irqsave(&cm_id_priv->lock, flags); 3675 switch (cm_id_priv->id.state) { 3676 /* Allow transition to RTS before sending REP */ 3677 case IB_CM_REQ_RCVD: 3678 case IB_CM_MRA_REQ_SENT: 3679 3680 case IB_CM_REP_RCVD: 3681 case IB_CM_MRA_REP_SENT: 3682 case IB_CM_REP_SENT: 3683 case IB_CM_MRA_REP_RCVD: 3684 case IB_CM_ESTABLISHED: 3685 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3686 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3687 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3688 switch (cm_id_priv->qp_type) { 3689 case IB_QPT_RC: 3690 case IB_QPT_XRC_INI: 3691 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3692 IB_QP_MAX_QP_RD_ATOMIC; 3693 qp_attr->retry_cnt = cm_id_priv->retry_count; 3694 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3695 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3696 /* fall through */ 3697 case IB_QPT_XRC_TGT: 3698 *qp_attr_mask |= IB_QP_TIMEOUT; 3699 qp_attr->timeout = cm_id_priv->av.timeout; 3700 break; 3701 default: 3702 break; 3703 } 3704 if (cm_id_priv->alt_av.ah_attr.dlid) { 3705 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3706 qp_attr->path_mig_state = IB_MIG_REARM; 3707 } 3708 } else { 3709 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3710 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3711 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3712 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3713 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3714 qp_attr->path_mig_state = IB_MIG_REARM; 3715 } 3716 ret = 0; 3717 break; 3718 default: 3719 ret = -EINVAL; 3720 break; 3721 } 3722 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3723 return ret; 3724 } 3725 3726 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3727 struct ib_qp_attr *qp_attr, 3728 int *qp_attr_mask) 3729 { 3730 struct cm_id_private *cm_id_priv; 3731 int ret; 3732 3733 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3734 switch (qp_attr->qp_state) { 3735 case IB_QPS_INIT: 3736 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3737 break; 3738 case IB_QPS_RTR: 3739 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3740 break; 3741 case IB_QPS_RTS: 3742 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3743 break; 3744 default: 3745 ret = -EINVAL; 3746 break; 3747 } 3748 return ret; 3749 } 3750 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3751 3752 static void cm_get_ack_delay(struct cm_device *cm_dev) 3753 { 3754 struct ib_device_attr attr; 3755 3756 if (ib_query_device(cm_dev->ib_device, &attr)) 3757 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3758 else 3759 cm_dev->ack_delay = attr.local_ca_ack_delay; 3760 } 3761 3762 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3763 char *buf) 3764 { 3765 struct cm_counter_group *group; 3766 struct cm_counter_attribute *cm_attr; 3767 3768 group = container_of(obj, struct cm_counter_group, obj); 3769 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3770 3771 return sprintf(buf, "%ld\n", 3772 atomic_long_read(&group->counter[cm_attr->index])); 3773 } 3774 3775 static const struct sysfs_ops cm_counter_ops = { 3776 .show = cm_show_counter 3777 }; 3778 3779 static struct kobj_type cm_counter_obj_type = { 3780 .sysfs_ops = &cm_counter_ops, 3781 .default_attrs = cm_counter_default_attrs 3782 }; 3783 3784 static void cm_release_port_obj(struct kobject *obj) 3785 { 3786 struct cm_port *cm_port; 3787 3788 cm_port = container_of(obj, struct cm_port, port_obj); 3789 kfree(cm_port); 3790 } 3791 3792 static struct kobj_type cm_port_obj_type = { 3793 .release = cm_release_port_obj 3794 }; 3795 3796 static char *cm_devnode(struct device *dev, umode_t *mode) 3797 { 3798 if (mode) 3799 *mode = 0666; 3800 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3801 } 3802 3803 struct class cm_class = { 3804 .owner = THIS_MODULE, 3805 .name = "infiniband_cm", 3806 .devnode = cm_devnode, 3807 }; 3808 EXPORT_SYMBOL(cm_class); 3809 3810 static int cm_create_port_fs(struct cm_port *port) 3811 { 3812 int i, ret; 3813 3814 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3815 &port->cm_dev->device->kobj, 3816 "%d", port->port_num); 3817 if (ret) { 3818 kfree(port); 3819 return ret; 3820 } 3821 3822 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3823 ret = kobject_init_and_add(&port->counter_group[i].obj, 3824 &cm_counter_obj_type, 3825 &port->port_obj, 3826 "%s", counter_group_names[i]); 3827 if (ret) 3828 goto error; 3829 } 3830 3831 return 0; 3832 3833 error: 3834 while (i--) 3835 kobject_put(&port->counter_group[i].obj); 3836 kobject_put(&port->port_obj); 3837 return ret; 3838 3839 } 3840 3841 static void cm_remove_port_fs(struct cm_port *port) 3842 { 3843 int i; 3844 3845 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3846 kobject_put(&port->counter_group[i].obj); 3847 3848 kobject_put(&port->port_obj); 3849 } 3850 3851 static void cm_add_one(struct ib_device *ib_device) 3852 { 3853 struct cm_device *cm_dev; 3854 struct cm_port *port; 3855 struct ib_mad_reg_req reg_req = { 3856 .mgmt_class = IB_MGMT_CLASS_CM, 3857 .mgmt_class_version = IB_CM_CLASS_VERSION, 3858 }; 3859 struct ib_port_modify port_modify = { 3860 .set_port_cap_mask = IB_PORT_CM_SUP 3861 }; 3862 unsigned long flags; 3863 int ret; 3864 int count = 0; 3865 u8 i; 3866 3867 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3868 ib_device->phys_port_cnt, GFP_KERNEL); 3869 if (!cm_dev) 3870 return; 3871 3872 cm_dev->ib_device = ib_device; 3873 cm_get_ack_delay(cm_dev); 3874 cm_dev->going_down = 0; 3875 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3876 MKDEV(0, 0), NULL, 3877 "%s", ib_device->name); 3878 if (IS_ERR(cm_dev->device)) { 3879 kfree(cm_dev); 3880 return; 3881 } 3882 3883 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3884 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3885 if (!rdma_cap_ib_cm(ib_device, i)) 3886 continue; 3887 3888 port = kzalloc(sizeof *port, GFP_KERNEL); 3889 if (!port) 3890 goto error1; 3891 3892 cm_dev->port[i-1] = port; 3893 port->cm_dev = cm_dev; 3894 port->port_num = i; 3895 3896 ret = cm_create_port_fs(port); 3897 if (ret) 3898 goto error1; 3899 3900 port->mad_agent = ib_register_mad_agent(ib_device, i, 3901 IB_QPT_GSI, 3902 ®_req, 3903 0, 3904 cm_send_handler, 3905 cm_recv_handler, 3906 port, 3907 0); 3908 if (IS_ERR(port->mad_agent)) 3909 goto error2; 3910 3911 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3912 if (ret) 3913 goto error3; 3914 3915 count++; 3916 } 3917 3918 if (!count) 3919 goto free; 3920 3921 ib_set_client_data(ib_device, &cm_client, cm_dev); 3922 3923 write_lock_irqsave(&cm.device_lock, flags); 3924 list_add_tail(&cm_dev->list, &cm.device_list); 3925 write_unlock_irqrestore(&cm.device_lock, flags); 3926 return; 3927 3928 error3: 3929 ib_unregister_mad_agent(port->mad_agent); 3930 error2: 3931 cm_remove_port_fs(port); 3932 error1: 3933 port_modify.set_port_cap_mask = 0; 3934 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3935 while (--i) { 3936 if (!rdma_cap_ib_cm(ib_device, i)) 3937 continue; 3938 3939 port = cm_dev->port[i-1]; 3940 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3941 ib_unregister_mad_agent(port->mad_agent); 3942 cm_remove_port_fs(port); 3943 } 3944 free: 3945 device_unregister(cm_dev->device); 3946 kfree(cm_dev); 3947 } 3948 3949 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 3950 { 3951 struct cm_device *cm_dev = client_data; 3952 struct cm_port *port; 3953 struct ib_port_modify port_modify = { 3954 .clr_port_cap_mask = IB_PORT_CM_SUP 3955 }; 3956 unsigned long flags; 3957 int i; 3958 3959 if (!cm_dev) 3960 return; 3961 3962 write_lock_irqsave(&cm.device_lock, flags); 3963 list_del(&cm_dev->list); 3964 write_unlock_irqrestore(&cm.device_lock, flags); 3965 3966 spin_lock_irq(&cm.lock); 3967 cm_dev->going_down = 1; 3968 spin_unlock_irq(&cm.lock); 3969 3970 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3971 if (!rdma_cap_ib_cm(ib_device, i)) 3972 continue; 3973 3974 port = cm_dev->port[i-1]; 3975 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3976 /* 3977 * We flush the queue here after the going_down set, this 3978 * verify that no new works will be queued in the recv handler, 3979 * after that we can call the unregister_mad_agent 3980 */ 3981 flush_workqueue(cm.wq); 3982 ib_unregister_mad_agent(port->mad_agent); 3983 cm_remove_port_fs(port); 3984 } 3985 device_unregister(cm_dev->device); 3986 kfree(cm_dev); 3987 } 3988 3989 static int __init ib_cm_init(void) 3990 { 3991 int ret; 3992 3993 memset(&cm, 0, sizeof cm); 3994 INIT_LIST_HEAD(&cm.device_list); 3995 rwlock_init(&cm.device_lock); 3996 spin_lock_init(&cm.lock); 3997 cm.listen_service_table = RB_ROOT; 3998 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3999 cm.remote_id_table = RB_ROOT; 4000 cm.remote_qp_table = RB_ROOT; 4001 cm.remote_sidr_table = RB_ROOT; 4002 idr_init(&cm.local_id_table); 4003 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4004 INIT_LIST_HEAD(&cm.timewait_list); 4005 4006 ret = class_register(&cm_class); 4007 if (ret) { 4008 ret = -ENOMEM; 4009 goto error1; 4010 } 4011 4012 cm.wq = create_workqueue("ib_cm"); 4013 if (!cm.wq) { 4014 ret = -ENOMEM; 4015 goto error2; 4016 } 4017 4018 ret = ib_register_client(&cm_client); 4019 if (ret) 4020 goto error3; 4021 4022 return 0; 4023 error3: 4024 destroy_workqueue(cm.wq); 4025 error2: 4026 class_unregister(&cm_class); 4027 error1: 4028 idr_destroy(&cm.local_id_table); 4029 return ret; 4030 } 4031 4032 static void __exit ib_cm_cleanup(void) 4033 { 4034 struct cm_timewait_info *timewait_info, *tmp; 4035 4036 spin_lock_irq(&cm.lock); 4037 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4038 cancel_delayed_work(&timewait_info->work.work); 4039 spin_unlock_irq(&cm.lock); 4040 4041 ib_unregister_client(&cm_client); 4042 destroy_workqueue(cm.wq); 4043 4044 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4045 list_del(&timewait_info->list); 4046 kfree(timewait_info); 4047 } 4048 4049 class_unregister(&cm_class); 4050 idr_destroy(&cm.local_id_table); 4051 } 4052 4053 module_init(ib_cm_init); 4054 module_exit(ib_cm_cleanup); 4055 4056