cm.c revision a977049dacdef6a9e69fb4872b42a68e93a69956
1/* 2 * Copyright (c) 2004, 2005 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 * $Id: cm.c 2821 2005-07-08 17:07:28Z sean.hefty $ 36 */ 37#include <linux/dma-mapping.h> 38#include <linux/err.h> 39#include <linux/idr.h> 40#include <linux/interrupt.h> 41#include <linux/pci.h> 42#include <linux/rbtree.h> 43#include <linux/spinlock.h> 44#include <linux/workqueue.h> 45 46#include <ib_cache.h> 47#include <ib_cm.h> 48#include "cm_msgs.h" 49 50MODULE_AUTHOR("Sean Hefty"); 51MODULE_DESCRIPTION("InfiniBand CM"); 52MODULE_LICENSE("Dual BSD/GPL"); 53 54static void cm_add_one(struct ib_device *device); 55static void cm_remove_one(struct ib_device *device); 56 57static struct ib_client cm_client = { 58 .name = "cm", 59 .add = cm_add_one, 60 .remove = cm_remove_one 61}; 62 63static struct ib_cm { 64 spinlock_t lock; 65 struct list_head device_list; 66 rwlock_t device_lock; 67 struct rb_root listen_service_table; 68 u64 listen_service_id; 69 /* struct rb_root peer_service_table; todo: fix peer to peer */ 70 struct rb_root remote_qp_table; 71 struct rb_root remote_id_table; 72 struct rb_root remote_sidr_table; 73 struct idr local_id_table; 74 struct workqueue_struct *wq; 75} cm; 76 77struct cm_port { 78 struct cm_device *cm_dev; 79 struct ib_mad_agent *mad_agent; 80 u8 port_num; 81}; 82 83struct cm_device { 84 struct list_head list; 85 struct ib_device *device; 86 u64 ca_guid; 87 struct cm_port port[0]; 88}; 89 90struct cm_av { 91 struct cm_port *port; 92 union ib_gid dgid; 93 struct ib_ah_attr ah_attr; 94 u16 pkey_index; 95 u8 packet_life_time; 96}; 97 98struct cm_work { 99 struct work_struct work; 100 struct list_head list; 101 struct cm_port *port; 102 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 103 u32 local_id; /* Established / timewait */ 104 u32 remote_id; 105 struct ib_cm_event cm_event; 106 struct ib_sa_path_rec path[0]; 107}; 108 109struct cm_timewait_info { 110 struct cm_work work; /* Must be first. */ 111 struct rb_node remote_qp_node; 112 struct rb_node remote_id_node; 113 u64 remote_ca_guid; 114 u32 remote_qpn; 115 u8 inserted_remote_qp; 116 u8 inserted_remote_id; 117}; 118 119struct cm_id_private { 120 struct ib_cm_id id; 121 122 struct rb_node service_node; 123 struct rb_node sidr_id_node; 124 spinlock_t lock; 125 wait_queue_head_t wait; 126 atomic_t refcount; 127 128 struct ib_mad_send_buf *msg; 129 struct cm_timewait_info *timewait_info; 130 /* todo: use alternate port on send failure */ 131 struct cm_av av; 132 struct cm_av alt_av; 133 134 void *private_data; 135 u64 tid; 136 u32 local_qpn; 137 u32 remote_qpn; 138 u32 sq_psn; 139 u32 rq_psn; 140 int timeout_ms; 141 enum ib_mtu path_mtu; 142 u8 private_data_len; 143 u8 max_cm_retries; 144 u8 peer_to_peer; 145 u8 responder_resources; 146 u8 initiator_depth; 147 u8 local_ack_timeout; 148 u8 retry_count; 149 u8 rnr_retry_count; 150 u8 service_timeout; 151 152 struct list_head work_list; 153 atomic_t work_count; 154}; 155 156static void cm_work_handler(void *data); 157 158static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 159{ 160 if (atomic_dec_and_test(&cm_id_priv->refcount)) 161 wake_up(&cm_id_priv->wait); 162} 163 164static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 165 struct ib_mad_send_buf **msg) 166{ 167 struct ib_mad_agent *mad_agent; 168 struct ib_mad_send_buf *m; 169 struct ib_ah *ah; 170 171 mad_agent = cm_id_priv->av.port->mad_agent; 172 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 173 if (IS_ERR(ah)) 174 return PTR_ERR(ah); 175 176 m = ib_create_send_mad(mad_agent, 1, cm_id_priv->av.pkey_index, 177 ah, 0, sizeof(struct ib_mad_hdr), 178 sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr), 179 GFP_ATOMIC); 180 if (IS_ERR(m)) { 181 ib_destroy_ah(ah); 182 return PTR_ERR(m); 183 } 184 185 /* Timeout set by caller if response is expected. */ 186 m->send_wr.wr.ud.retries = cm_id_priv->max_cm_retries; 187 188 atomic_inc(&cm_id_priv->refcount); 189 m->context[0] = cm_id_priv; 190 *msg = m; 191 return 0; 192} 193 194static int cm_alloc_response_msg(struct cm_port *port, 195 struct ib_mad_recv_wc *mad_recv_wc, 196 struct ib_mad_send_buf **msg) 197{ 198 struct ib_mad_send_buf *m; 199 struct ib_ah *ah; 200 201 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 202 mad_recv_wc->recv_buf.grh, port->port_num); 203 if (IS_ERR(ah)) 204 return PTR_ERR(ah); 205 206 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 207 ah, 0, sizeof(struct ib_mad_hdr), 208 sizeof(struct ib_mad)-sizeof(struct ib_mad_hdr), 209 GFP_ATOMIC); 210 if (IS_ERR(m)) { 211 ib_destroy_ah(ah); 212 return PTR_ERR(m); 213 } 214 *msg = m; 215 return 0; 216} 217 218static void cm_free_msg(struct ib_mad_send_buf *msg) 219{ 220 ib_destroy_ah(msg->send_wr.wr.ud.ah); 221 if (msg->context[0]) 222 cm_deref_id(msg->context[0]); 223 ib_free_send_mad(msg); 224} 225 226static void * cm_copy_private_data(const void *private_data, 227 u8 private_data_len) 228{ 229 void *data; 230 231 if (!private_data || !private_data_len) 232 return NULL; 233 234 data = kmalloc(private_data_len, GFP_KERNEL); 235 if (!data) 236 return ERR_PTR(-ENOMEM); 237 238 memcpy(data, private_data, private_data_len); 239 return data; 240} 241 242static void cm_set_private_data(struct cm_id_private *cm_id_priv, 243 void *private_data, u8 private_data_len) 244{ 245 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 246 kfree(cm_id_priv->private_data); 247 248 cm_id_priv->private_data = private_data; 249 cm_id_priv->private_data_len = private_data_len; 250} 251 252static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num, 253 u16 dlid, u8 sl, u16 src_path_bits) 254{ 255 memset(ah_attr, 0, sizeof ah_attr); 256 ah_attr->dlid = be16_to_cpu(dlid); 257 ah_attr->sl = sl; 258 ah_attr->src_path_bits = src_path_bits; 259 ah_attr->port_num = port_num; 260} 261 262static void cm_init_av_for_response(struct cm_port *port, 263 struct ib_wc *wc, struct cm_av *av) 264{ 265 av->port = port; 266 av->pkey_index = wc->pkey_index; 267 cm_set_ah_attr(&av->ah_attr, port->port_num, cpu_to_be16(wc->slid), 268 wc->sl, wc->dlid_path_bits); 269} 270 271static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 272{ 273 struct cm_device *cm_dev; 274 struct cm_port *port = NULL; 275 unsigned long flags; 276 int ret; 277 u8 p; 278 279 read_lock_irqsave(&cm.device_lock, flags); 280 list_for_each_entry(cm_dev, &cm.device_list, list) { 281 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 282 &p, NULL)) { 283 port = &cm_dev->port[p-1]; 284 break; 285 } 286 } 287 read_unlock_irqrestore(&cm.device_lock, flags); 288 289 if (!port) 290 return -EINVAL; 291 292 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 293 be16_to_cpu(path->pkey), &av->pkey_index); 294 if (ret) 295 return ret; 296 297 av->port = port; 298 cm_set_ah_attr(&av->ah_attr, av->port->port_num, path->dlid, 299 path->sl, path->slid & 0x7F); 300 av->packet_life_time = path->packet_life_time; 301 return 0; 302} 303 304static int cm_alloc_id(struct cm_id_private *cm_id_priv) 305{ 306 unsigned long flags; 307 int ret; 308 309 do { 310 spin_lock_irqsave(&cm.lock, flags); 311 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1, 312 (int *) &cm_id_priv->id.local_id); 313 spin_unlock_irqrestore(&cm.lock, flags); 314 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 315 return ret; 316} 317 318static void cm_free_id(u32 local_id) 319{ 320 unsigned long flags; 321 322 spin_lock_irqsave(&cm.lock, flags); 323 idr_remove(&cm.local_id_table, (int) local_id); 324 spin_unlock_irqrestore(&cm.lock, flags); 325} 326 327static struct cm_id_private * cm_get_id(u32 local_id, u32 remote_id) 328{ 329 struct cm_id_private *cm_id_priv; 330 331 cm_id_priv = idr_find(&cm.local_id_table, (int) local_id); 332 if (cm_id_priv) { 333 if (cm_id_priv->id.remote_id == remote_id) 334 atomic_inc(&cm_id_priv->refcount); 335 else 336 cm_id_priv = NULL; 337 } 338 339 return cm_id_priv; 340} 341 342static struct cm_id_private * cm_acquire_id(u32 local_id, u32 remote_id) 343{ 344 struct cm_id_private *cm_id_priv; 345 unsigned long flags; 346 347 spin_lock_irqsave(&cm.lock, flags); 348 cm_id_priv = cm_get_id(local_id, remote_id); 349 spin_unlock_irqrestore(&cm.lock, flags); 350 351 return cm_id_priv; 352} 353 354static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 355{ 356 struct rb_node **link = &cm.listen_service_table.rb_node; 357 struct rb_node *parent = NULL; 358 struct cm_id_private *cur_cm_id_priv; 359 u64 service_id = cm_id_priv->id.service_id; 360 u64 service_mask = cm_id_priv->id.service_mask; 361 362 while (*link) { 363 parent = *link; 364 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 365 service_node); 366 if ((cur_cm_id_priv->id.service_mask & service_id) == 367 (service_mask & cur_cm_id_priv->id.service_id)) 368 return cm_id_priv; 369 if (service_id < cur_cm_id_priv->id.service_id) 370 link = &(*link)->rb_left; 371 else 372 link = &(*link)->rb_right; 373 } 374 rb_link_node(&cm_id_priv->service_node, parent, link); 375 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 376 return NULL; 377} 378 379static struct cm_id_private * cm_find_listen(u64 service_id) 380{ 381 struct rb_node *node = cm.listen_service_table.rb_node; 382 struct cm_id_private *cm_id_priv; 383 384 while (node) { 385 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 386 if ((cm_id_priv->id.service_mask & service_id) == 387 (cm_id_priv->id.service_mask & cm_id_priv->id.service_id)) 388 return cm_id_priv; 389 if (service_id < cm_id_priv->id.service_id) 390 node = node->rb_left; 391 else 392 node = node->rb_right; 393 } 394 return NULL; 395} 396 397static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 398 *timewait_info) 399{ 400 struct rb_node **link = &cm.remote_id_table.rb_node; 401 struct rb_node *parent = NULL; 402 struct cm_timewait_info *cur_timewait_info; 403 u64 remote_ca_guid = timewait_info->remote_ca_guid; 404 u32 remote_id = timewait_info->work.remote_id; 405 406 while (*link) { 407 parent = *link; 408 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 409 remote_id_node); 410 if (remote_id < cur_timewait_info->work.remote_id) 411 link = &(*link)->rb_left; 412 else if (remote_id > cur_timewait_info->work.remote_id) 413 link = &(*link)->rb_right; 414 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 415 link = &(*link)->rb_left; 416 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 417 link = &(*link)->rb_right; 418 else 419 return cur_timewait_info; 420 } 421 timewait_info->inserted_remote_id = 1; 422 rb_link_node(&timewait_info->remote_id_node, parent, link); 423 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 424 return NULL; 425} 426 427static struct cm_timewait_info * cm_find_remote_id(u64 remote_ca_guid, 428 u32 remote_id) 429{ 430 struct rb_node *node = cm.remote_id_table.rb_node; 431 struct cm_timewait_info *timewait_info; 432 433 while (node) { 434 timewait_info = rb_entry(node, struct cm_timewait_info, 435 remote_id_node); 436 if (remote_id < timewait_info->work.remote_id) 437 node = node->rb_left; 438 else if (remote_id > timewait_info->work.remote_id) 439 node = node->rb_right; 440 else if (remote_ca_guid < timewait_info->remote_ca_guid) 441 node = node->rb_left; 442 else if (remote_ca_guid > timewait_info->remote_ca_guid) 443 node = node->rb_right; 444 else 445 return timewait_info; 446 } 447 return NULL; 448} 449 450static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 451 *timewait_info) 452{ 453 struct rb_node **link = &cm.remote_qp_table.rb_node; 454 struct rb_node *parent = NULL; 455 struct cm_timewait_info *cur_timewait_info; 456 u64 remote_ca_guid = timewait_info->remote_ca_guid; 457 u32 remote_qpn = timewait_info->remote_qpn; 458 459 while (*link) { 460 parent = *link; 461 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 462 remote_qp_node); 463 if (remote_qpn < cur_timewait_info->remote_qpn) 464 link = &(*link)->rb_left; 465 else if (remote_qpn > cur_timewait_info->remote_qpn) 466 link = &(*link)->rb_right; 467 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 468 link = &(*link)->rb_left; 469 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 470 link = &(*link)->rb_right; 471 else 472 return cur_timewait_info; 473 } 474 timewait_info->inserted_remote_qp = 1; 475 rb_link_node(&timewait_info->remote_qp_node, parent, link); 476 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 477 return NULL; 478} 479 480static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 481 *cm_id_priv) 482{ 483 struct rb_node **link = &cm.remote_sidr_table.rb_node; 484 struct rb_node *parent = NULL; 485 struct cm_id_private *cur_cm_id_priv; 486 union ib_gid *port_gid = &cm_id_priv->av.dgid; 487 u32 remote_id = cm_id_priv->id.remote_id; 488 489 while (*link) { 490 parent = *link; 491 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 492 sidr_id_node); 493 if (remote_id < cur_cm_id_priv->id.remote_id) 494 link = &(*link)->rb_left; 495 else if (remote_id > cur_cm_id_priv->id.remote_id) 496 link = &(*link)->rb_right; 497 else { 498 int cmp; 499 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 500 sizeof *port_gid); 501 if (cmp < 0) 502 link = &(*link)->rb_left; 503 else if (cmp > 0) 504 link = &(*link)->rb_right; 505 else 506 return cur_cm_id_priv; 507 } 508 } 509 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 510 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 511 return NULL; 512} 513 514static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 515 enum ib_cm_sidr_status status) 516{ 517 struct ib_cm_sidr_rep_param param; 518 519 memset(¶m, 0, sizeof param); 520 param.status = status; 521 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 522} 523 524struct ib_cm_id *ib_create_cm_id(ib_cm_handler cm_handler, 525 void *context) 526{ 527 struct cm_id_private *cm_id_priv; 528 int ret; 529 530 cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL); 531 if (!cm_id_priv) 532 return ERR_PTR(-ENOMEM); 533 534 memset(cm_id_priv, 0, sizeof *cm_id_priv); 535 cm_id_priv->id.state = IB_CM_IDLE; 536 cm_id_priv->id.cm_handler = cm_handler; 537 cm_id_priv->id.context = context; 538 ret = cm_alloc_id(cm_id_priv); 539 if (ret) 540 goto error; 541 542 spin_lock_init(&cm_id_priv->lock); 543 init_waitqueue_head(&cm_id_priv->wait); 544 INIT_LIST_HEAD(&cm_id_priv->work_list); 545 atomic_set(&cm_id_priv->work_count, -1); 546 atomic_set(&cm_id_priv->refcount, 1); 547 return &cm_id_priv->id; 548 549error: 550 kfree(cm_id_priv); 551 return ERR_PTR(-ENOMEM); 552} 553EXPORT_SYMBOL(ib_create_cm_id); 554 555static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 556{ 557 struct cm_work *work; 558 559 if (list_empty(&cm_id_priv->work_list)) 560 return NULL; 561 562 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 563 list_del(&work->list); 564 return work; 565} 566 567static void cm_free_work(struct cm_work *work) 568{ 569 if (work->mad_recv_wc) 570 ib_free_recv_mad(work->mad_recv_wc); 571 kfree(work); 572} 573 574static inline int cm_convert_to_ms(int iba_time) 575{ 576 /* approximate conversion to ms from 4.096us x 2^iba_time */ 577 return 1 << max(iba_time - 8, 0); 578} 579 580static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 581{ 582 unsigned long flags; 583 584 if (!timewait_info->inserted_remote_id && 585 !timewait_info->inserted_remote_qp) 586 return; 587 588 spin_lock_irqsave(&cm.lock, flags); 589 if (timewait_info->inserted_remote_id) { 590 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 591 timewait_info->inserted_remote_id = 0; 592 } 593 594 if (timewait_info->inserted_remote_qp) { 595 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 596 timewait_info->inserted_remote_qp = 0; 597 } 598 spin_unlock_irqrestore(&cm.lock, flags); 599} 600 601static struct cm_timewait_info * cm_create_timewait_info(u32 local_id) 602{ 603 struct cm_timewait_info *timewait_info; 604 605 timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL); 606 if (!timewait_info) 607 return ERR_PTR(-ENOMEM); 608 memset(timewait_info, 0, sizeof *timewait_info); 609 610 timewait_info->work.local_id = local_id; 611 INIT_WORK(&timewait_info->work.work, cm_work_handler, 612 &timewait_info->work); 613 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 614 return timewait_info; 615} 616 617static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 618{ 619 int wait_time; 620 621 /* 622 * The cm_id could be destroyed by the user before we exit timewait. 623 * To protect against this, we search for the cm_id after exiting 624 * timewait before notifying the user that we've exited timewait. 625 */ 626 cm_id_priv->id.state = IB_CM_TIMEWAIT; 627 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout); 628 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 629 msecs_to_jiffies(wait_time)); 630 cm_id_priv->timewait_info = NULL; 631} 632 633static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 634{ 635 cm_id_priv->id.state = IB_CM_IDLE; 636 if (cm_id_priv->timewait_info) { 637 cm_cleanup_timewait(cm_id_priv->timewait_info); 638 kfree(cm_id_priv->timewait_info); 639 cm_id_priv->timewait_info = NULL; 640 } 641} 642 643void ib_destroy_cm_id(struct ib_cm_id *cm_id) 644{ 645 struct cm_id_private *cm_id_priv; 646 struct cm_work *work; 647 unsigned long flags; 648 649 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 650retest: 651 spin_lock_irqsave(&cm_id_priv->lock, flags); 652 switch (cm_id->state) { 653 case IB_CM_LISTEN: 654 cm_id->state = IB_CM_IDLE; 655 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 656 spin_lock_irqsave(&cm.lock, flags); 657 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 658 spin_unlock_irqrestore(&cm.lock, flags); 659 break; 660 case IB_CM_SIDR_REQ_SENT: 661 cm_id->state = IB_CM_IDLE; 662 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 663 (unsigned long) cm_id_priv->msg); 664 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 665 break; 666 case IB_CM_SIDR_REQ_RCVD: 667 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 668 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 669 break; 670 case IB_CM_REQ_SENT: 671 case IB_CM_MRA_REQ_RCVD: 672 case IB_CM_REP_SENT: 673 case IB_CM_MRA_REP_RCVD: 674 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 675 (unsigned long) cm_id_priv->msg); 676 /* Fall through */ 677 case IB_CM_REQ_RCVD: 678 case IB_CM_MRA_REQ_SENT: 679 case IB_CM_REP_RCVD: 680 case IB_CM_MRA_REP_SENT: 681 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 682 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 683 &cm_id_priv->av.port->cm_dev->ca_guid, 684 sizeof cm_id_priv->av.port->cm_dev->ca_guid, 685 NULL, 0); 686 break; 687 case IB_CM_ESTABLISHED: 688 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 689 ib_send_cm_dreq(cm_id, NULL, 0); 690 goto retest; 691 case IB_CM_DREQ_SENT: 692 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 693 (unsigned long) cm_id_priv->msg); 694 cm_enter_timewait(cm_id_priv); 695 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 696 break; 697 case IB_CM_DREQ_RCVD: 698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 699 ib_send_cm_drep(cm_id, NULL, 0); 700 break; 701 default: 702 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 703 break; 704 } 705 706 cm_free_id(cm_id->local_id); 707 atomic_dec(&cm_id_priv->refcount); 708 wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount)); 709 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 710 cm_free_work(work); 711 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 712 kfree(cm_id_priv->private_data); 713 kfree(cm_id_priv); 714} 715EXPORT_SYMBOL(ib_destroy_cm_id); 716 717int ib_cm_listen(struct ib_cm_id *cm_id, 718 u64 service_id, 719 u64 service_mask) 720{ 721 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 722 unsigned long flags; 723 int ret = 0; 724 725 service_mask = service_mask ? service_mask : ~0ULL; 726 service_id &= service_mask; 727 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 728 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 729 return -EINVAL; 730 731 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 732 BUG_ON(cm_id->state != IB_CM_IDLE); 733 734 cm_id->state = IB_CM_LISTEN; 735 736 spin_lock_irqsave(&cm.lock, flags); 737 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 738 cm_id->service_id = __cpu_to_be64(cm.listen_service_id++); 739 cm_id->service_mask = ~0ULL; 740 } else { 741 cm_id->service_id = service_id; 742 cm_id->service_mask = service_mask; 743 } 744 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 745 spin_unlock_irqrestore(&cm.lock, flags); 746 747 if (cur_cm_id_priv) { 748 cm_id->state = IB_CM_IDLE; 749 ret = -EBUSY; 750 } 751 return ret; 752} 753EXPORT_SYMBOL(ib_cm_listen); 754 755static u64 cm_form_tid(struct cm_id_private *cm_id_priv, 756 enum cm_msg_sequence msg_seq) 757{ 758 u64 hi_tid, low_tid; 759 760 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 761 low_tid = (u64) (cm_id_priv->id.local_id | (msg_seq << 30)); 762 return cpu_to_be64(hi_tid | low_tid); 763} 764 765static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 766 enum cm_msg_attr_id attr_id, u64 tid) 767{ 768 hdr->base_version = IB_MGMT_BASE_VERSION; 769 hdr->mgmt_class = IB_MGMT_CLASS_CM; 770 hdr->class_version = IB_CM_CLASS_VERSION; 771 hdr->method = IB_MGMT_METHOD_SEND; 772 hdr->attr_id = attr_id; 773 hdr->tid = tid; 774} 775 776static void cm_format_req(struct cm_req_msg *req_msg, 777 struct cm_id_private *cm_id_priv, 778 struct ib_cm_req_param *param) 779{ 780 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 781 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 782 783 req_msg->local_comm_id = cm_id_priv->id.local_id; 784 req_msg->service_id = param->service_id; 785 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 786 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 787 cm_req_set_resp_res(req_msg, param->responder_resources); 788 cm_req_set_init_depth(req_msg, param->initiator_depth); 789 cm_req_set_remote_resp_timeout(req_msg, 790 param->remote_cm_response_timeout); 791 cm_req_set_qp_type(req_msg, param->qp_type); 792 cm_req_set_flow_ctrl(req_msg, param->flow_control); 793 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 794 cm_req_set_local_resp_timeout(req_msg, 795 param->local_cm_response_timeout); 796 cm_req_set_retry_count(req_msg, param->retry_count); 797 req_msg->pkey = param->primary_path->pkey; 798 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 799 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 800 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 801 cm_req_set_srq(req_msg, param->srq); 802 803 req_msg->primary_local_lid = param->primary_path->slid; 804 req_msg->primary_remote_lid = param->primary_path->dlid; 805 req_msg->primary_local_gid = param->primary_path->sgid; 806 req_msg->primary_remote_gid = param->primary_path->dgid; 807 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 808 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 809 req_msg->primary_traffic_class = param->primary_path->traffic_class; 810 req_msg->primary_hop_limit = param->primary_path->hop_limit; 811 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 812 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 813 cm_req_set_primary_local_ack_timeout(req_msg, 814 min(31, param->primary_path->packet_life_time + 1)); 815 816 if (param->alternate_path) { 817 req_msg->alt_local_lid = param->alternate_path->slid; 818 req_msg->alt_remote_lid = param->alternate_path->dlid; 819 req_msg->alt_local_gid = param->alternate_path->sgid; 820 req_msg->alt_remote_gid = param->alternate_path->dgid; 821 cm_req_set_alt_flow_label(req_msg, 822 param->alternate_path->flow_label); 823 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 824 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 825 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 826 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 827 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 828 cm_req_set_alt_local_ack_timeout(req_msg, 829 min(31, param->alternate_path->packet_life_time + 1)); 830 } 831 832 if (param->private_data && param->private_data_len) 833 memcpy(req_msg->private_data, param->private_data, 834 param->private_data_len); 835} 836 837static inline int cm_validate_req_param(struct ib_cm_req_param *param) 838{ 839 /* peer-to-peer not supported */ 840 if (param->peer_to_peer) 841 return -EINVAL; 842 843 if (!param->primary_path) 844 return -EINVAL; 845 846 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 847 return -EINVAL; 848 849 if (param->private_data && 850 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 851 return -EINVAL; 852 853 if (param->alternate_path && 854 (param->alternate_path->pkey != param->primary_path->pkey || 855 param->alternate_path->mtu != param->primary_path->mtu)) 856 return -EINVAL; 857 858 return 0; 859} 860 861int ib_send_cm_req(struct ib_cm_id *cm_id, 862 struct ib_cm_req_param *param) 863{ 864 struct cm_id_private *cm_id_priv; 865 struct ib_send_wr *bad_send_wr; 866 struct cm_req_msg *req_msg; 867 unsigned long flags; 868 int ret; 869 870 ret = cm_validate_req_param(param); 871 if (ret) 872 return ret; 873 874 /* Verify that we're not in timewait. */ 875 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 876 spin_lock_irqsave(&cm_id_priv->lock, flags); 877 if (cm_id->state != IB_CM_IDLE) { 878 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 879 ret = -EINVAL; 880 goto out; 881 } 882 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 883 884 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 885 id.local_id); 886 if (IS_ERR(cm_id_priv->timewait_info)) 887 goto out; 888 889 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 890 if (ret) 891 goto error1; 892 if (param->alternate_path) { 893 ret = cm_init_av_by_path(param->alternate_path, 894 &cm_id_priv->alt_av); 895 if (ret) 896 goto error1; 897 } 898 cm_id->service_id = param->service_id; 899 cm_id->service_mask = ~0ULL; 900 cm_id_priv->timeout_ms = cm_convert_to_ms( 901 param->primary_path->packet_life_time) * 2 + 902 cm_convert_to_ms( 903 param->remote_cm_response_timeout); 904 cm_id_priv->max_cm_retries = param->max_cm_retries; 905 cm_id_priv->initiator_depth = param->initiator_depth; 906 cm_id_priv->responder_resources = param->responder_resources; 907 cm_id_priv->retry_count = param->retry_count; 908 cm_id_priv->path_mtu = param->primary_path->mtu; 909 910 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 911 if (ret) 912 goto error1; 913 914 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 915 cm_format_req(req_msg, cm_id_priv, param); 916 cm_id_priv->tid = req_msg->hdr.tid; 917 cm_id_priv->msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms; 918 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 919 920 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 921 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 922 cm_id_priv->local_ack_timeout = 923 cm_req_get_primary_local_ack_timeout(req_msg); 924 925 spin_lock_irqsave(&cm_id_priv->lock, flags); 926 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 927 &cm_id_priv->msg->send_wr, &bad_send_wr); 928 if (ret) { 929 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 930 goto error2; 931 } 932 BUG_ON(cm_id->state != IB_CM_IDLE); 933 cm_id->state = IB_CM_REQ_SENT; 934 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 935 return 0; 936 937error2: cm_free_msg(cm_id_priv->msg); 938error1: kfree(cm_id_priv->timewait_info); 939out: return ret; 940} 941EXPORT_SYMBOL(ib_send_cm_req); 942 943static int cm_issue_rej(struct cm_port *port, 944 struct ib_mad_recv_wc *mad_recv_wc, 945 enum ib_cm_rej_reason reason, 946 enum cm_msg_response msg_rejected, 947 void *ari, u8 ari_length) 948{ 949 struct ib_mad_send_buf *msg = NULL; 950 struct ib_send_wr *bad_send_wr; 951 struct cm_rej_msg *rej_msg, *rcv_msg; 952 int ret; 953 954 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 955 if (ret) 956 return ret; 957 958 /* We just need common CM header information. Cast to any message. */ 959 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 960 rej_msg = (struct cm_rej_msg *) msg->mad; 961 962 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 963 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 964 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 965 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 966 rej_msg->reason = reason; 967 968 if (ari && ari_length) { 969 cm_rej_set_reject_info_len(rej_msg, ari_length); 970 memcpy(rej_msg->ari, ari, ari_length); 971 } 972 973 ret = ib_post_send_mad(port->mad_agent, &msg->send_wr, &bad_send_wr); 974 if (ret) 975 cm_free_msg(msg); 976 977 return ret; 978} 979 980static inline int cm_is_active_peer(u64 local_ca_guid, u64 remote_ca_guid, 981 u32 local_qpn, u32 remote_qpn) 982{ 983 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 984 ((local_ca_guid == remote_ca_guid) && 985 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 986} 987 988static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg, 989 struct ib_sa_path_rec *primary_path, 990 struct ib_sa_path_rec *alt_path) 991{ 992 memset(primary_path, 0, sizeof *primary_path); 993 primary_path->dgid = req_msg->primary_local_gid; 994 primary_path->sgid = req_msg->primary_remote_gid; 995 primary_path->dlid = req_msg->primary_local_lid; 996 primary_path->slid = req_msg->primary_remote_lid; 997 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 998 primary_path->hop_limit = req_msg->primary_hop_limit; 999 primary_path->traffic_class = req_msg->primary_traffic_class; 1000 primary_path->reversible = 1; 1001 primary_path->pkey = req_msg->pkey; 1002 primary_path->sl = cm_req_get_primary_sl(req_msg); 1003 primary_path->mtu_selector = IB_SA_EQ; 1004 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1005 primary_path->rate_selector = IB_SA_EQ; 1006 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1007 primary_path->packet_life_time_selector = IB_SA_EQ; 1008 primary_path->packet_life_time = 1009 cm_req_get_primary_local_ack_timeout(req_msg); 1010 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1011 1012 if (req_msg->alt_local_lid) { 1013 memset(alt_path, 0, sizeof *alt_path); 1014 alt_path->dgid = req_msg->alt_local_gid; 1015 alt_path->sgid = req_msg->alt_remote_gid; 1016 alt_path->dlid = req_msg->alt_local_lid; 1017 alt_path->slid = req_msg->alt_remote_lid; 1018 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1019 alt_path->hop_limit = req_msg->alt_hop_limit; 1020 alt_path->traffic_class = req_msg->alt_traffic_class; 1021 alt_path->reversible = 1; 1022 alt_path->pkey = req_msg->pkey; 1023 alt_path->sl = cm_req_get_alt_sl(req_msg); 1024 alt_path->mtu_selector = IB_SA_EQ; 1025 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1026 alt_path->rate_selector = IB_SA_EQ; 1027 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1028 alt_path->packet_life_time_selector = IB_SA_EQ; 1029 alt_path->packet_life_time = 1030 cm_req_get_alt_local_ack_timeout(req_msg); 1031 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1032 } 1033} 1034 1035static void cm_format_req_event(struct cm_work *work, 1036 struct cm_id_private *cm_id_priv, 1037 struct ib_cm_id *listen_id) 1038{ 1039 struct cm_req_msg *req_msg; 1040 struct ib_cm_req_event_param *param; 1041 1042 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1043 param = &work->cm_event.param.req_rcvd; 1044 param->listen_id = listen_id; 1045 param->device = cm_id_priv->av.port->mad_agent->device; 1046 param->port = cm_id_priv->av.port->port_num; 1047 param->primary_path = &work->path[0]; 1048 if (req_msg->alt_local_lid) 1049 param->alternate_path = &work->path[1]; 1050 else 1051 param->alternate_path = NULL; 1052 param->remote_ca_guid = req_msg->local_ca_guid; 1053 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1054 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1055 param->qp_type = cm_req_get_qp_type(req_msg); 1056 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1057 param->responder_resources = cm_req_get_init_depth(req_msg); 1058 param->initiator_depth = cm_req_get_resp_res(req_msg); 1059 param->local_cm_response_timeout = 1060 cm_req_get_remote_resp_timeout(req_msg); 1061 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1062 param->remote_cm_response_timeout = 1063 cm_req_get_local_resp_timeout(req_msg); 1064 param->retry_count = cm_req_get_retry_count(req_msg); 1065 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1066 param->srq = cm_req_get_srq(req_msg); 1067 work->cm_event.private_data = &req_msg->private_data; 1068} 1069 1070static void cm_process_work(struct cm_id_private *cm_id_priv, 1071 struct cm_work *work) 1072{ 1073 unsigned long flags; 1074 int ret; 1075 1076 /* We will typically only have the current event to report. */ 1077 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1078 cm_free_work(work); 1079 1080 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1081 spin_lock_irqsave(&cm_id_priv->lock, flags); 1082 work = cm_dequeue_work(cm_id_priv); 1083 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1084 BUG_ON(!work); 1085 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1086 &work->cm_event); 1087 cm_free_work(work); 1088 } 1089 cm_deref_id(cm_id_priv); 1090 if (ret) 1091 ib_destroy_cm_id(&cm_id_priv->id); 1092} 1093 1094static void cm_format_mra(struct cm_mra_msg *mra_msg, 1095 struct cm_id_private *cm_id_priv, 1096 enum cm_msg_response msg_mraed, u8 service_timeout, 1097 const void *private_data, u8 private_data_len) 1098{ 1099 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1100 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1101 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1102 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1103 cm_mra_set_service_timeout(mra_msg, service_timeout); 1104 1105 if (private_data && private_data_len) 1106 memcpy(mra_msg->private_data, private_data, private_data_len); 1107} 1108 1109static void cm_format_rej(struct cm_rej_msg *rej_msg, 1110 struct cm_id_private *cm_id_priv, 1111 enum ib_cm_rej_reason reason, 1112 void *ari, 1113 u8 ari_length, 1114 const void *private_data, 1115 u8 private_data_len) 1116{ 1117 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1118 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1119 1120 switch(cm_id_priv->id.state) { 1121 case IB_CM_REQ_RCVD: 1122 rej_msg->local_comm_id = 0; 1123 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1124 break; 1125 case IB_CM_MRA_REQ_SENT: 1126 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1127 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1128 break; 1129 case IB_CM_REP_RCVD: 1130 case IB_CM_MRA_REP_SENT: 1131 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1132 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1133 break; 1134 default: 1135 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1136 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1137 break; 1138 } 1139 1140 rej_msg->reason = reason; 1141 if (ari && ari_length) { 1142 cm_rej_set_reject_info_len(rej_msg, ari_length); 1143 memcpy(rej_msg->ari, ari, ari_length); 1144 } 1145 1146 if (private_data && private_data_len) 1147 memcpy(rej_msg->private_data, private_data, private_data_len); 1148} 1149 1150static void cm_dup_req_handler(struct cm_work *work, 1151 struct cm_id_private *cm_id_priv) 1152{ 1153 struct ib_mad_send_buf *msg = NULL; 1154 struct ib_send_wr *bad_send_wr; 1155 unsigned long flags; 1156 int ret; 1157 1158 /* Quick state check to discard duplicate REQs. */ 1159 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1160 return; 1161 1162 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1163 if (ret) 1164 return; 1165 1166 spin_lock_irqsave(&cm_id_priv->lock, flags); 1167 switch (cm_id_priv->id.state) { 1168 case IB_CM_MRA_REQ_SENT: 1169 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1170 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1171 cm_id_priv->private_data, 1172 cm_id_priv->private_data_len); 1173 break; 1174 case IB_CM_TIMEWAIT: 1175 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1176 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1177 break; 1178 default: 1179 goto unlock; 1180 } 1181 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1182 1183 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr, 1184 &bad_send_wr); 1185 if (ret) 1186 goto free; 1187 return; 1188 1189unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1190free: cm_free_msg(msg); 1191} 1192 1193static struct cm_id_private * cm_match_req(struct cm_work *work, 1194 struct cm_id_private *cm_id_priv) 1195{ 1196 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1197 struct cm_timewait_info *timewait_info; 1198 struct cm_req_msg *req_msg; 1199 unsigned long flags; 1200 1201 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1202 1203 /* Check for duplicate REQ and stale connections. */ 1204 spin_lock_irqsave(&cm.lock, flags); 1205 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1206 if (!timewait_info) 1207 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1208 1209 if (timewait_info) { 1210 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1211 timewait_info->work.remote_id); 1212 spin_unlock_irqrestore(&cm.lock, flags); 1213 if (cur_cm_id_priv) { 1214 cm_dup_req_handler(work, cur_cm_id_priv); 1215 cm_deref_id(cur_cm_id_priv); 1216 } else 1217 cm_issue_rej(work->port, work->mad_recv_wc, 1218 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1219 NULL, 0); 1220 goto error; 1221 } 1222 1223 /* Find matching listen request. */ 1224 listen_cm_id_priv = cm_find_listen(req_msg->service_id); 1225 if (!listen_cm_id_priv) { 1226 spin_unlock_irqrestore(&cm.lock, flags); 1227 cm_issue_rej(work->port, work->mad_recv_wc, 1228 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1229 NULL, 0); 1230 goto error; 1231 } 1232 atomic_inc(&listen_cm_id_priv->refcount); 1233 atomic_inc(&cm_id_priv->refcount); 1234 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1235 atomic_inc(&cm_id_priv->work_count); 1236 spin_unlock_irqrestore(&cm.lock, flags); 1237 return listen_cm_id_priv; 1238 1239error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1240 return NULL; 1241} 1242 1243static int cm_req_handler(struct cm_work *work) 1244{ 1245 struct ib_cm_id *cm_id; 1246 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1247 struct cm_req_msg *req_msg; 1248 int ret; 1249 1250 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1251 1252 cm_id = ib_create_cm_id(NULL, NULL); 1253 if (IS_ERR(cm_id)) 1254 return PTR_ERR(cm_id); 1255 1256 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1257 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1258 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1259 &cm_id_priv->av); 1260 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1261 id.local_id); 1262 if (IS_ERR(cm_id_priv->timewait_info)) { 1263 ret = PTR_ERR(cm_id_priv->timewait_info); 1264 goto error1; 1265 } 1266 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1267 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1268 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1269 1270 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1271 if (!listen_cm_id_priv) { 1272 ret = -EINVAL; 1273 goto error2; 1274 } 1275 1276 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1277 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1278 cm_id_priv->id.service_id = req_msg->service_id; 1279 cm_id_priv->id.service_mask = ~0ULL; 1280 1281 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1282 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1283 if (ret) 1284 goto error3; 1285 if (req_msg->alt_local_lid) { 1286 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1287 if (ret) 1288 goto error3; 1289 } 1290 cm_id_priv->tid = req_msg->hdr.tid; 1291 cm_id_priv->timeout_ms = cm_convert_to_ms( 1292 cm_req_get_local_resp_timeout(req_msg)); 1293 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1294 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1295 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1296 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1297 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1298 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1299 cm_id_priv->local_ack_timeout = 1300 cm_req_get_primary_local_ack_timeout(req_msg); 1301 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1302 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1303 1304 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1305 cm_process_work(cm_id_priv, work); 1306 cm_deref_id(listen_cm_id_priv); 1307 return 0; 1308 1309error3: atomic_dec(&cm_id_priv->refcount); 1310 cm_deref_id(listen_cm_id_priv); 1311 cm_cleanup_timewait(cm_id_priv->timewait_info); 1312error2: kfree(cm_id_priv->timewait_info); 1313error1: ib_destroy_cm_id(&cm_id_priv->id); 1314 return ret; 1315} 1316 1317static void cm_format_rep(struct cm_rep_msg *rep_msg, 1318 struct cm_id_private *cm_id_priv, 1319 struct ib_cm_rep_param *param) 1320{ 1321 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1322 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1323 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1324 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1325 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1326 rep_msg->resp_resources = param->responder_resources; 1327 rep_msg->initiator_depth = param->initiator_depth; 1328 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay); 1329 cm_rep_set_failover(rep_msg, param->failover_accepted); 1330 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1331 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1332 cm_rep_set_srq(rep_msg, param->srq); 1333 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 1334 1335 if (param->private_data && param->private_data_len) 1336 memcpy(rep_msg->private_data, param->private_data, 1337 param->private_data_len); 1338} 1339 1340int ib_send_cm_rep(struct ib_cm_id *cm_id, 1341 struct ib_cm_rep_param *param) 1342{ 1343 struct cm_id_private *cm_id_priv; 1344 struct ib_mad_send_buf *msg; 1345 struct cm_rep_msg *rep_msg; 1346 struct ib_send_wr *bad_send_wr; 1347 unsigned long flags; 1348 int ret; 1349 1350 if (param->private_data && 1351 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1352 return -EINVAL; 1353 1354 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1355 spin_lock_irqsave(&cm_id_priv->lock, flags); 1356 if (cm_id->state != IB_CM_REQ_RCVD && 1357 cm_id->state != IB_CM_MRA_REQ_SENT) { 1358 ret = -EINVAL; 1359 goto out; 1360 } 1361 1362 ret = cm_alloc_msg(cm_id_priv, &msg); 1363 if (ret) 1364 goto out; 1365 1366 rep_msg = (struct cm_rep_msg *) msg->mad; 1367 cm_format_rep(rep_msg, cm_id_priv, param); 1368 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms; 1369 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1370 1371 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 1372 &msg->send_wr, &bad_send_wr); 1373 if (ret) { 1374 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1375 cm_free_msg(msg); 1376 return ret; 1377 } 1378 1379 cm_id->state = IB_CM_REP_SENT; 1380 cm_id_priv->msg = msg; 1381 cm_id_priv->initiator_depth = param->initiator_depth; 1382 cm_id_priv->responder_resources = param->responder_resources; 1383 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1384 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1385 1386out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1387 return ret; 1388} 1389EXPORT_SYMBOL(ib_send_cm_rep); 1390 1391static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1392 struct cm_id_private *cm_id_priv, 1393 const void *private_data, 1394 u8 private_data_len) 1395{ 1396 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1397 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1398 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1399 1400 if (private_data && private_data_len) 1401 memcpy(rtu_msg->private_data, private_data, private_data_len); 1402} 1403 1404int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1405 const void *private_data, 1406 u8 private_data_len) 1407{ 1408 struct cm_id_private *cm_id_priv; 1409 struct ib_mad_send_buf *msg; 1410 struct ib_send_wr *bad_send_wr; 1411 unsigned long flags; 1412 void *data; 1413 int ret; 1414 1415 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1416 return -EINVAL; 1417 1418 data = cm_copy_private_data(private_data, private_data_len); 1419 if (IS_ERR(data)) 1420 return PTR_ERR(data); 1421 1422 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1423 spin_lock_irqsave(&cm_id_priv->lock, flags); 1424 if (cm_id->state != IB_CM_REP_RCVD && 1425 cm_id->state != IB_CM_MRA_REP_SENT) { 1426 ret = -EINVAL; 1427 goto error; 1428 } 1429 1430 ret = cm_alloc_msg(cm_id_priv, &msg); 1431 if (ret) 1432 goto error; 1433 1434 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1435 private_data, private_data_len); 1436 1437 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 1438 &msg->send_wr, &bad_send_wr); 1439 if (ret) { 1440 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1441 cm_free_msg(msg); 1442 kfree(data); 1443 return ret; 1444 } 1445 1446 cm_id->state = IB_CM_ESTABLISHED; 1447 cm_set_private_data(cm_id_priv, data, private_data_len); 1448 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1449 return 0; 1450 1451error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1452 kfree(data); 1453 return ret; 1454} 1455EXPORT_SYMBOL(ib_send_cm_rtu); 1456 1457static void cm_format_rep_event(struct cm_work *work) 1458{ 1459 struct cm_rep_msg *rep_msg; 1460 struct ib_cm_rep_event_param *param; 1461 1462 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1463 param = &work->cm_event.param.rep_rcvd; 1464 param->remote_ca_guid = rep_msg->local_ca_guid; 1465 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1466 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1467 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1468 param->responder_resources = rep_msg->initiator_depth; 1469 param->initiator_depth = rep_msg->resp_resources; 1470 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1471 param->failover_accepted = cm_rep_get_failover(rep_msg); 1472 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1473 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1474 param->srq = cm_rep_get_srq(rep_msg); 1475 work->cm_event.private_data = &rep_msg->private_data; 1476} 1477 1478static void cm_dup_rep_handler(struct cm_work *work) 1479{ 1480 struct cm_id_private *cm_id_priv; 1481 struct cm_rep_msg *rep_msg; 1482 struct ib_mad_send_buf *msg = NULL; 1483 struct ib_send_wr *bad_send_wr; 1484 unsigned long flags; 1485 int ret; 1486 1487 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1488 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1489 rep_msg->local_comm_id); 1490 if (!cm_id_priv) 1491 return; 1492 1493 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1494 if (ret) 1495 goto deref; 1496 1497 spin_lock_irqsave(&cm_id_priv->lock, flags); 1498 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1499 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1500 cm_id_priv->private_data, 1501 cm_id_priv->private_data_len); 1502 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1503 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1504 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1505 cm_id_priv->private_data, 1506 cm_id_priv->private_data_len); 1507 else 1508 goto unlock; 1509 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1510 1511 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr, 1512 &bad_send_wr); 1513 if (ret) 1514 goto free; 1515 goto deref; 1516 1517unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1518free: cm_free_msg(msg); 1519deref: cm_deref_id(cm_id_priv); 1520} 1521 1522static int cm_rep_handler(struct cm_work *work) 1523{ 1524 struct cm_id_private *cm_id_priv; 1525 struct cm_rep_msg *rep_msg; 1526 unsigned long flags; 1527 int ret; 1528 1529 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1530 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1531 if (!cm_id_priv) { 1532 cm_dup_rep_handler(work); 1533 return -EINVAL; 1534 } 1535 1536 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1537 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1538 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1539 1540 spin_lock_irqsave(&cm.lock, flags); 1541 /* Check for duplicate REP. */ 1542 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1543 spin_unlock_irqrestore(&cm.lock, flags); 1544 ret = -EINVAL; 1545 goto error; 1546 } 1547 /* Check for a stale connection. */ 1548 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1549 spin_unlock_irqrestore(&cm.lock, flags); 1550 cm_issue_rej(work->port, work->mad_recv_wc, 1551 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1552 NULL, 0); 1553 ret = -EINVAL; 1554 goto error; 1555 } 1556 spin_unlock_irqrestore(&cm.lock, flags); 1557 1558 cm_format_rep_event(work); 1559 1560 spin_lock_irqsave(&cm_id_priv->lock, flags); 1561 switch (cm_id_priv->id.state) { 1562 case IB_CM_REQ_SENT: 1563 case IB_CM_MRA_REQ_RCVD: 1564 break; 1565 default: 1566 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1567 ret = -EINVAL; 1568 goto error; 1569 } 1570 cm_id_priv->id.state = IB_CM_REP_RCVD; 1571 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1572 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1573 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1574 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1575 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1576 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1577 1578 /* todo: handle peer_to_peer */ 1579 1580 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 1581 (unsigned long) cm_id_priv->msg); 1582 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1583 if (!ret) 1584 list_add_tail(&work->list, &cm_id_priv->work_list); 1585 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1586 1587 if (ret) 1588 cm_process_work(cm_id_priv, work); 1589 else 1590 cm_deref_id(cm_id_priv); 1591 return 0; 1592 1593error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1594 cm_deref_id(cm_id_priv); 1595 return ret; 1596} 1597 1598static int cm_establish_handler(struct cm_work *work) 1599{ 1600 struct cm_id_private *cm_id_priv; 1601 unsigned long flags; 1602 int ret; 1603 1604 /* See comment in ib_cm_establish about lookup. */ 1605 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1606 if (!cm_id_priv) 1607 return -EINVAL; 1608 1609 spin_lock_irqsave(&cm_id_priv->lock, flags); 1610 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1611 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1612 goto out; 1613 } 1614 1615 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 1616 (unsigned long) cm_id_priv->msg); 1617 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1618 if (!ret) 1619 list_add_tail(&work->list, &cm_id_priv->work_list); 1620 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1621 1622 if (ret) 1623 cm_process_work(cm_id_priv, work); 1624 else 1625 cm_deref_id(cm_id_priv); 1626 return 0; 1627out: 1628 cm_deref_id(cm_id_priv); 1629 return -EINVAL; 1630} 1631 1632static int cm_rtu_handler(struct cm_work *work) 1633{ 1634 struct cm_id_private *cm_id_priv; 1635 struct cm_rtu_msg *rtu_msg; 1636 unsigned long flags; 1637 int ret; 1638 1639 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1640 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1641 rtu_msg->local_comm_id); 1642 if (!cm_id_priv) 1643 return -EINVAL; 1644 1645 work->cm_event.private_data = &rtu_msg->private_data; 1646 1647 spin_lock_irqsave(&cm_id_priv->lock, flags); 1648 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1649 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1650 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1651 goto out; 1652 } 1653 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1654 1655 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 1656 (unsigned long) cm_id_priv->msg); 1657 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1658 if (!ret) 1659 list_add_tail(&work->list, &cm_id_priv->work_list); 1660 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1661 1662 if (ret) 1663 cm_process_work(cm_id_priv, work); 1664 else 1665 cm_deref_id(cm_id_priv); 1666 return 0; 1667out: 1668 cm_deref_id(cm_id_priv); 1669 return -EINVAL; 1670} 1671 1672static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1673 struct cm_id_private *cm_id_priv, 1674 const void *private_data, 1675 u8 private_data_len) 1676{ 1677 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1678 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1679 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1680 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1681 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1682 1683 if (private_data && private_data_len) 1684 memcpy(dreq_msg->private_data, private_data, private_data_len); 1685} 1686 1687int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1688 const void *private_data, 1689 u8 private_data_len) 1690{ 1691 struct cm_id_private *cm_id_priv; 1692 struct ib_mad_send_buf *msg; 1693 struct ib_send_wr *bad_send_wr; 1694 unsigned long flags; 1695 int ret; 1696 1697 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1698 return -EINVAL; 1699 1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1701 spin_lock_irqsave(&cm_id_priv->lock, flags); 1702 if (cm_id->state != IB_CM_ESTABLISHED) { 1703 ret = -EINVAL; 1704 goto out; 1705 } 1706 1707 ret = cm_alloc_msg(cm_id_priv, &msg); 1708 if (ret) { 1709 cm_enter_timewait(cm_id_priv); 1710 goto out; 1711 } 1712 1713 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1714 private_data, private_data_len); 1715 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms; 1716 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1717 1718 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 1719 &msg->send_wr, &bad_send_wr); 1720 if (ret) { 1721 cm_enter_timewait(cm_id_priv); 1722 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1723 cm_free_msg(msg); 1724 return ret; 1725 } 1726 1727 cm_id->state = IB_CM_DREQ_SENT; 1728 cm_id_priv->msg = msg; 1729out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1730 return ret; 1731} 1732EXPORT_SYMBOL(ib_send_cm_dreq); 1733 1734static void cm_format_drep(struct cm_drep_msg *drep_msg, 1735 struct cm_id_private *cm_id_priv, 1736 const void *private_data, 1737 u8 private_data_len) 1738{ 1739 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1740 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1741 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1742 1743 if (private_data && private_data_len) 1744 memcpy(drep_msg->private_data, private_data, private_data_len); 1745} 1746 1747int ib_send_cm_drep(struct ib_cm_id *cm_id, 1748 const void *private_data, 1749 u8 private_data_len) 1750{ 1751 struct cm_id_private *cm_id_priv; 1752 struct ib_mad_send_buf *msg; 1753 struct ib_send_wr *bad_send_wr; 1754 unsigned long flags; 1755 void *data; 1756 int ret; 1757 1758 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1759 return -EINVAL; 1760 1761 data = cm_copy_private_data(private_data, private_data_len); 1762 if (IS_ERR(data)) 1763 return PTR_ERR(data); 1764 1765 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1766 spin_lock_irqsave(&cm_id_priv->lock, flags); 1767 if (cm_id->state != IB_CM_DREQ_RCVD) { 1768 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1769 kfree(data); 1770 return -EINVAL; 1771 } 1772 1773 cm_set_private_data(cm_id_priv, data, private_data_len); 1774 cm_enter_timewait(cm_id_priv); 1775 1776 ret = cm_alloc_msg(cm_id_priv, &msg); 1777 if (ret) 1778 goto out; 1779 1780 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1781 private_data, private_data_len); 1782 1783 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, &msg->send_wr, 1784 &bad_send_wr); 1785 if (ret) { 1786 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1787 cm_free_msg(msg); 1788 return ret; 1789 } 1790 1791out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1792 return ret; 1793} 1794EXPORT_SYMBOL(ib_send_cm_drep); 1795 1796static int cm_dreq_handler(struct cm_work *work) 1797{ 1798 struct cm_id_private *cm_id_priv; 1799 struct cm_dreq_msg *dreq_msg; 1800 struct ib_mad_send_buf *msg = NULL; 1801 struct ib_send_wr *bad_send_wr; 1802 unsigned long flags; 1803 int ret; 1804 1805 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1806 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1807 dreq_msg->local_comm_id); 1808 if (!cm_id_priv) 1809 return -EINVAL; 1810 1811 work->cm_event.private_data = &dreq_msg->private_data; 1812 1813 spin_lock_irqsave(&cm_id_priv->lock, flags); 1814 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1815 goto unlock; 1816 1817 switch (cm_id_priv->id.state) { 1818 case IB_CM_REP_SENT: 1819 case IB_CM_DREQ_SENT: 1820 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 1821 (unsigned long) cm_id_priv->msg); 1822 break; 1823 case IB_CM_ESTABLISHED: 1824 case IB_CM_MRA_REP_RCVD: 1825 break; 1826 case IB_CM_TIMEWAIT: 1827 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1828 goto unlock; 1829 1830 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1831 cm_id_priv->private_data, 1832 cm_id_priv->private_data_len); 1833 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1834 1835 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent, 1836 &msg->send_wr, &bad_send_wr)) 1837 cm_free_msg(msg); 1838 goto deref; 1839 default: 1840 goto unlock; 1841 } 1842 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 1843 cm_id_priv->tid = dreq_msg->hdr.tid; 1844 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1845 if (!ret) 1846 list_add_tail(&work->list, &cm_id_priv->work_list); 1847 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1848 1849 if (ret) 1850 cm_process_work(cm_id_priv, work); 1851 else 1852 cm_deref_id(cm_id_priv); 1853 return 0; 1854 1855unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1856deref: cm_deref_id(cm_id_priv); 1857 return -EINVAL; 1858} 1859 1860static int cm_drep_handler(struct cm_work *work) 1861{ 1862 struct cm_id_private *cm_id_priv; 1863 struct cm_drep_msg *drep_msg; 1864 unsigned long flags; 1865 int ret; 1866 1867 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 1868 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 1869 drep_msg->local_comm_id); 1870 if (!cm_id_priv) 1871 return -EINVAL; 1872 1873 work->cm_event.private_data = &drep_msg->private_data; 1874 1875 spin_lock_irqsave(&cm_id_priv->lock, flags); 1876 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 1877 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 1878 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1879 goto out; 1880 } 1881 cm_enter_timewait(cm_id_priv); 1882 1883 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 1884 (unsigned long) cm_id_priv->msg); 1885 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1886 if (!ret) 1887 list_add_tail(&work->list, &cm_id_priv->work_list); 1888 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1889 1890 if (ret) 1891 cm_process_work(cm_id_priv, work); 1892 else 1893 cm_deref_id(cm_id_priv); 1894 return 0; 1895out: 1896 cm_deref_id(cm_id_priv); 1897 return -EINVAL; 1898} 1899 1900int ib_send_cm_rej(struct ib_cm_id *cm_id, 1901 enum ib_cm_rej_reason reason, 1902 void *ari, 1903 u8 ari_length, 1904 const void *private_data, 1905 u8 private_data_len) 1906{ 1907 struct cm_id_private *cm_id_priv; 1908 struct ib_mad_send_buf *msg; 1909 struct ib_send_wr *bad_send_wr; 1910 unsigned long flags; 1911 int ret; 1912 1913 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 1914 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 1915 return -EINVAL; 1916 1917 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1918 1919 spin_lock_irqsave(&cm_id_priv->lock, flags); 1920 switch (cm_id->state) { 1921 case IB_CM_REQ_SENT: 1922 case IB_CM_MRA_REQ_RCVD: 1923 case IB_CM_REQ_RCVD: 1924 case IB_CM_MRA_REQ_SENT: 1925 case IB_CM_REP_RCVD: 1926 case IB_CM_MRA_REP_SENT: 1927 ret = cm_alloc_msg(cm_id_priv, &msg); 1928 if (!ret) 1929 cm_format_rej((struct cm_rej_msg *) msg->mad, 1930 cm_id_priv, reason, ari, ari_length, 1931 private_data, private_data_len); 1932 1933 cm_reset_to_idle(cm_id_priv); 1934 break; 1935 case IB_CM_REP_SENT: 1936 case IB_CM_MRA_REP_RCVD: 1937 ret = cm_alloc_msg(cm_id_priv, &msg); 1938 if (!ret) 1939 cm_format_rej((struct cm_rej_msg *) msg->mad, 1940 cm_id_priv, reason, ari, ari_length, 1941 private_data, private_data_len); 1942 1943 cm_enter_timewait(cm_id_priv); 1944 break; 1945 default: 1946 ret = -EINVAL; 1947 goto out; 1948 } 1949 1950 if (ret) 1951 goto out; 1952 1953 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 1954 &msg->send_wr, &bad_send_wr); 1955 if (ret) 1956 cm_free_msg(msg); 1957 1958out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1959 return ret; 1960} 1961EXPORT_SYMBOL(ib_send_cm_rej); 1962 1963static void cm_format_rej_event(struct cm_work *work) 1964{ 1965 struct cm_rej_msg *rej_msg; 1966 struct ib_cm_rej_event_param *param; 1967 1968 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 1969 param = &work->cm_event.param.rej_rcvd; 1970 param->ari = rej_msg->ari; 1971 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 1972 param->reason = rej_msg->reason; 1973 work->cm_event.private_data = &rej_msg->private_data; 1974} 1975 1976static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 1977{ 1978 struct cm_timewait_info *timewait_info; 1979 struct cm_id_private *cm_id_priv; 1980 unsigned long flags; 1981 u32 remote_id; 1982 1983 remote_id = rej_msg->local_comm_id; 1984 1985 if (rej_msg->reason == IB_CM_REJ_TIMEOUT) { 1986 spin_lock_irqsave(&cm.lock, flags); 1987 timewait_info = cm_find_remote_id( *((u64 *) rej_msg->ari), 1988 remote_id); 1989 if (!timewait_info) { 1990 spin_unlock_irqrestore(&cm.lock, flags); 1991 return NULL; 1992 } 1993 cm_id_priv = idr_find(&cm.local_id_table, 1994 (int) timewait_info->work.local_id); 1995 if (cm_id_priv) { 1996 if (cm_id_priv->id.remote_id == remote_id) 1997 atomic_inc(&cm_id_priv->refcount); 1998 else 1999 cm_id_priv = NULL; 2000 } 2001 spin_unlock_irqrestore(&cm.lock, flags); 2002 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2003 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2004 else 2005 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2006 2007 return cm_id_priv; 2008} 2009 2010static int cm_rej_handler(struct cm_work *work) 2011{ 2012 struct cm_id_private *cm_id_priv; 2013 struct cm_rej_msg *rej_msg; 2014 unsigned long flags; 2015 int ret; 2016 2017 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2018 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2019 if (!cm_id_priv) 2020 return -EINVAL; 2021 2022 cm_format_rej_event(work); 2023 2024 spin_lock_irqsave(&cm_id_priv->lock, flags); 2025 switch (cm_id_priv->id.state) { 2026 case IB_CM_REQ_SENT: 2027 case IB_CM_MRA_REQ_RCVD: 2028 case IB_CM_REP_SENT: 2029 case IB_CM_MRA_REP_RCVD: 2030 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2031 (unsigned long) cm_id_priv->msg); 2032 /* fall through */ 2033 case IB_CM_REQ_RCVD: 2034 case IB_CM_MRA_REQ_SENT: 2035 if (rej_msg->reason == IB_CM_REJ_STALE_CONN) 2036 cm_enter_timewait(cm_id_priv); 2037 else 2038 cm_reset_to_idle(cm_id_priv); 2039 break; 2040 case IB_CM_DREQ_SENT: 2041 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2042 (unsigned long) cm_id_priv->msg); 2043 /* fall through */ 2044 case IB_CM_REP_RCVD: 2045 case IB_CM_MRA_REP_SENT: 2046 case IB_CM_ESTABLISHED: 2047 cm_enter_timewait(cm_id_priv); 2048 break; 2049 default: 2050 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2051 ret = -EINVAL; 2052 goto out; 2053 } 2054 2055 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2056 if (!ret) 2057 list_add_tail(&work->list, &cm_id_priv->work_list); 2058 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2059 2060 if (ret) 2061 cm_process_work(cm_id_priv, work); 2062 else 2063 cm_deref_id(cm_id_priv); 2064 return 0; 2065out: 2066 cm_deref_id(cm_id_priv); 2067 return -EINVAL; 2068} 2069 2070int ib_send_cm_mra(struct ib_cm_id *cm_id, 2071 u8 service_timeout, 2072 const void *private_data, 2073 u8 private_data_len) 2074{ 2075 struct cm_id_private *cm_id_priv; 2076 struct ib_mad_send_buf *msg; 2077 struct ib_send_wr *bad_send_wr; 2078 void *data; 2079 unsigned long flags; 2080 int ret; 2081 2082 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2083 return -EINVAL; 2084 2085 data = cm_copy_private_data(private_data, private_data_len); 2086 if (IS_ERR(data)) 2087 return PTR_ERR(data); 2088 2089 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2090 2091 spin_lock_irqsave(&cm_id_priv->lock, flags); 2092 switch(cm_id_priv->id.state) { 2093 case IB_CM_REQ_RCVD: 2094 ret = cm_alloc_msg(cm_id_priv, &msg); 2095 if (ret) 2096 goto error1; 2097 2098 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2099 CM_MSG_RESPONSE_REQ, service_timeout, 2100 private_data, private_data_len); 2101 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2102 &msg->send_wr, &bad_send_wr); 2103 if (ret) 2104 goto error2; 2105 cm_id->state = IB_CM_MRA_REQ_SENT; 2106 break; 2107 case IB_CM_REP_RCVD: 2108 ret = cm_alloc_msg(cm_id_priv, &msg); 2109 if (ret) 2110 goto error1; 2111 2112 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2113 CM_MSG_RESPONSE_REP, service_timeout, 2114 private_data, private_data_len); 2115 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2116 &msg->send_wr, &bad_send_wr); 2117 if (ret) 2118 goto error2; 2119 cm_id->state = IB_CM_MRA_REP_SENT; 2120 break; 2121 case IB_CM_ESTABLISHED: 2122 ret = cm_alloc_msg(cm_id_priv, &msg); 2123 if (ret) 2124 goto error1; 2125 2126 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2127 CM_MSG_RESPONSE_OTHER, service_timeout, 2128 private_data, private_data_len); 2129 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2130 &msg->send_wr, &bad_send_wr); 2131 if (ret) 2132 goto error2; 2133 cm_id->lap_state = IB_CM_MRA_LAP_SENT; 2134 break; 2135 default: 2136 ret = -EINVAL; 2137 goto error1; 2138 } 2139 cm_id_priv->service_timeout = service_timeout; 2140 cm_set_private_data(cm_id_priv, data, private_data_len); 2141 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2142 return 0; 2143 2144error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2145 kfree(data); 2146 return ret; 2147 2148error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2149 kfree(data); 2150 cm_free_msg(msg); 2151 return ret; 2152} 2153EXPORT_SYMBOL(ib_send_cm_mra); 2154 2155static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2156{ 2157 switch (cm_mra_get_msg_mraed(mra_msg)) { 2158 case CM_MSG_RESPONSE_REQ: 2159 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2160 case CM_MSG_RESPONSE_REP: 2161 case CM_MSG_RESPONSE_OTHER: 2162 return cm_acquire_id(mra_msg->remote_comm_id, 2163 mra_msg->local_comm_id); 2164 default: 2165 return NULL; 2166 } 2167} 2168 2169static int cm_mra_handler(struct cm_work *work) 2170{ 2171 struct cm_id_private *cm_id_priv; 2172 struct cm_mra_msg *mra_msg; 2173 unsigned long flags; 2174 int timeout, ret; 2175 2176 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2177 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2178 if (!cm_id_priv) 2179 return -EINVAL; 2180 2181 work->cm_event.private_data = &mra_msg->private_data; 2182 work->cm_event.param.mra_rcvd.service_timeout = 2183 cm_mra_get_service_timeout(mra_msg); 2184 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2185 cm_convert_to_ms(cm_id_priv->av.packet_life_time); 2186 2187 spin_lock_irqsave(&cm_id_priv->lock, flags); 2188 switch (cm_id_priv->id.state) { 2189 case IB_CM_REQ_SENT: 2190 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2191 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2192 (unsigned long) cm_id_priv->msg, timeout)) 2193 goto out; 2194 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2195 break; 2196 case IB_CM_REP_SENT: 2197 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2198 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2199 (unsigned long) cm_id_priv->msg, timeout)) 2200 goto out; 2201 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2202 break; 2203 case IB_CM_ESTABLISHED: 2204 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2205 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2206 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2207 (unsigned long) cm_id_priv->msg, timeout)) 2208 goto out; 2209 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2210 break; 2211 default: 2212 goto out; 2213 } 2214 2215 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2216 cm_id_priv->id.state; 2217 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2218 if (!ret) 2219 list_add_tail(&work->list, &cm_id_priv->work_list); 2220 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2221 2222 if (ret) 2223 cm_process_work(cm_id_priv, work); 2224 else 2225 cm_deref_id(cm_id_priv); 2226 return 0; 2227out: 2228 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2229 cm_deref_id(cm_id_priv); 2230 return -EINVAL; 2231} 2232 2233static void cm_format_lap(struct cm_lap_msg *lap_msg, 2234 struct cm_id_private *cm_id_priv, 2235 struct ib_sa_path_rec *alternate_path, 2236 const void *private_data, 2237 u8 private_data_len) 2238{ 2239 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2240 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2241 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2242 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2243 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2244 /* todo: need remote CM response timeout */ 2245 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2246 lap_msg->alt_local_lid = alternate_path->slid; 2247 lap_msg->alt_remote_lid = alternate_path->dlid; 2248 lap_msg->alt_local_gid = alternate_path->sgid; 2249 lap_msg->alt_remote_gid = alternate_path->dgid; 2250 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2251 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2252 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2253 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2254 cm_lap_set_sl(lap_msg, alternate_path->sl); 2255 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2256 cm_lap_set_local_ack_timeout(lap_msg, 2257 min(31, alternate_path->packet_life_time + 1)); 2258 2259 if (private_data && private_data_len) 2260 memcpy(lap_msg->private_data, private_data, private_data_len); 2261} 2262 2263int ib_send_cm_lap(struct ib_cm_id *cm_id, 2264 struct ib_sa_path_rec *alternate_path, 2265 const void *private_data, 2266 u8 private_data_len) 2267{ 2268 struct cm_id_private *cm_id_priv; 2269 struct ib_mad_send_buf *msg; 2270 struct ib_send_wr *bad_send_wr; 2271 unsigned long flags; 2272 int ret; 2273 2274 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2275 return -EINVAL; 2276 2277 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2278 spin_lock_irqsave(&cm_id_priv->lock, flags); 2279 if (cm_id->state != IB_CM_ESTABLISHED || 2280 cm_id->lap_state != IB_CM_LAP_IDLE) { 2281 ret = -EINVAL; 2282 goto out; 2283 } 2284 2285 ret = cm_alloc_msg(cm_id_priv, &msg); 2286 if (ret) 2287 goto out; 2288 2289 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2290 alternate_path, private_data, private_data_len); 2291 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms; 2292 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2293 2294 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2295 &msg->send_wr, &bad_send_wr); 2296 if (ret) { 2297 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2298 cm_free_msg(msg); 2299 return ret; 2300 } 2301 2302 cm_id->lap_state = IB_CM_LAP_SENT; 2303 cm_id_priv->msg = msg; 2304 2305out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2306 return ret; 2307} 2308EXPORT_SYMBOL(ib_send_cm_lap); 2309 2310static void cm_format_path_from_lap(struct ib_sa_path_rec *path, 2311 struct cm_lap_msg *lap_msg) 2312{ 2313 memset(path, 0, sizeof *path); 2314 path->dgid = lap_msg->alt_local_gid; 2315 path->sgid = lap_msg->alt_remote_gid; 2316 path->dlid = lap_msg->alt_local_lid; 2317 path->slid = lap_msg->alt_remote_lid; 2318 path->flow_label = cm_lap_get_flow_label(lap_msg); 2319 path->hop_limit = lap_msg->alt_hop_limit; 2320 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2321 path->reversible = 1; 2322 /* pkey is same as in REQ */ 2323 path->sl = cm_lap_get_sl(lap_msg); 2324 path->mtu_selector = IB_SA_EQ; 2325 /* mtu is same as in REQ */ 2326 path->rate_selector = IB_SA_EQ; 2327 path->rate = cm_lap_get_packet_rate(lap_msg); 2328 path->packet_life_time_selector = IB_SA_EQ; 2329 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2330 path->packet_life_time -= (path->packet_life_time > 0); 2331} 2332 2333static int cm_lap_handler(struct cm_work *work) 2334{ 2335 struct cm_id_private *cm_id_priv; 2336 struct cm_lap_msg *lap_msg; 2337 struct ib_cm_lap_event_param *param; 2338 struct ib_mad_send_buf *msg = NULL; 2339 struct ib_send_wr *bad_send_wr; 2340 unsigned long flags; 2341 int ret; 2342 2343 /* todo: verify LAP request and send reject APR if invalid. */ 2344 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2345 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2346 lap_msg->local_comm_id); 2347 if (!cm_id_priv) 2348 return -EINVAL; 2349 2350 param = &work->cm_event.param.lap_rcvd; 2351 param->alternate_path = &work->path[0]; 2352 cm_format_path_from_lap(param->alternate_path, lap_msg); 2353 work->cm_event.private_data = &lap_msg->private_data; 2354 2355 spin_lock_irqsave(&cm_id_priv->lock, flags); 2356 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2357 goto unlock; 2358 2359 switch (cm_id_priv->id.lap_state) { 2360 case IB_CM_LAP_IDLE: 2361 break; 2362 case IB_CM_MRA_LAP_SENT: 2363 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2364 goto unlock; 2365 2366 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2367 CM_MSG_RESPONSE_OTHER, 2368 cm_id_priv->service_timeout, 2369 cm_id_priv->private_data, 2370 cm_id_priv->private_data_len); 2371 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2372 2373 if (ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2374 &msg->send_wr, &bad_send_wr)) 2375 cm_free_msg(msg); 2376 goto deref; 2377 default: 2378 goto unlock; 2379 } 2380 2381 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2382 cm_id_priv->tid = lap_msg->hdr.tid; 2383 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2384 if (!ret) 2385 list_add_tail(&work->list, &cm_id_priv->work_list); 2386 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2387 2388 if (ret) 2389 cm_process_work(cm_id_priv, work); 2390 else 2391 cm_deref_id(cm_id_priv); 2392 return 0; 2393 2394unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2395deref: cm_deref_id(cm_id_priv); 2396 return -EINVAL; 2397} 2398 2399static void cm_format_apr(struct cm_apr_msg *apr_msg, 2400 struct cm_id_private *cm_id_priv, 2401 enum ib_cm_apr_status status, 2402 void *info, 2403 u8 info_length, 2404 const void *private_data, 2405 u8 private_data_len) 2406{ 2407 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2408 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2409 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2410 apr_msg->ap_status = (u8) status; 2411 2412 if (info && info_length) { 2413 apr_msg->info_length = info_length; 2414 memcpy(apr_msg->info, info, info_length); 2415 } 2416 2417 if (private_data && private_data_len) 2418 memcpy(apr_msg->private_data, private_data, private_data_len); 2419} 2420 2421int ib_send_cm_apr(struct ib_cm_id *cm_id, 2422 enum ib_cm_apr_status status, 2423 void *info, 2424 u8 info_length, 2425 const void *private_data, 2426 u8 private_data_len) 2427{ 2428 struct cm_id_private *cm_id_priv; 2429 struct ib_mad_send_buf *msg; 2430 struct ib_send_wr *bad_send_wr; 2431 unsigned long flags; 2432 int ret; 2433 2434 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2435 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2436 return -EINVAL; 2437 2438 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2439 spin_lock_irqsave(&cm_id_priv->lock, flags); 2440 if (cm_id->state != IB_CM_ESTABLISHED || 2441 (cm_id->lap_state != IB_CM_LAP_RCVD && 2442 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2443 ret = -EINVAL; 2444 goto out; 2445 } 2446 2447 ret = cm_alloc_msg(cm_id_priv, &msg); 2448 if (ret) 2449 goto out; 2450 2451 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2452 info, info_length, private_data, private_data_len); 2453 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2454 &msg->send_wr, &bad_send_wr); 2455 if (ret) { 2456 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2457 cm_free_msg(msg); 2458 return ret; 2459 } 2460 2461 cm_id->lap_state = IB_CM_LAP_IDLE; 2462out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2463 return ret; 2464} 2465EXPORT_SYMBOL(ib_send_cm_apr); 2466 2467static int cm_apr_handler(struct cm_work *work) 2468{ 2469 struct cm_id_private *cm_id_priv; 2470 struct cm_apr_msg *apr_msg; 2471 unsigned long flags; 2472 int ret; 2473 2474 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2475 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2476 apr_msg->local_comm_id); 2477 if (!cm_id_priv) 2478 return -EINVAL; /* Unmatched reply. */ 2479 2480 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2481 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2482 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2483 work->cm_event.private_data = &apr_msg->private_data; 2484 2485 spin_lock_irqsave(&cm_id_priv->lock, flags); 2486 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2487 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2488 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2489 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2490 goto out; 2491 } 2492 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2493 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2494 (unsigned long) cm_id_priv->msg); 2495 cm_id_priv->msg = NULL; 2496 2497 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2498 if (!ret) 2499 list_add_tail(&work->list, &cm_id_priv->work_list); 2500 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2501 2502 if (ret) 2503 cm_process_work(cm_id_priv, work); 2504 else 2505 cm_deref_id(cm_id_priv); 2506 return 0; 2507out: 2508 cm_deref_id(cm_id_priv); 2509 return -EINVAL; 2510} 2511 2512static int cm_timewait_handler(struct cm_work *work) 2513{ 2514 struct cm_timewait_info *timewait_info; 2515 struct cm_id_private *cm_id_priv; 2516 unsigned long flags; 2517 int ret; 2518 2519 timewait_info = (struct cm_timewait_info *)work; 2520 cm_cleanup_timewait(timewait_info); 2521 2522 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2523 timewait_info->work.remote_id); 2524 if (!cm_id_priv) 2525 return -EINVAL; 2526 2527 spin_lock_irqsave(&cm_id_priv->lock, flags); 2528 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2529 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2530 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2531 goto out; 2532 } 2533 cm_id_priv->id.state = IB_CM_IDLE; 2534 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2535 if (!ret) 2536 list_add_tail(&work->list, &cm_id_priv->work_list); 2537 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2538 2539 if (ret) 2540 cm_process_work(cm_id_priv, work); 2541 else 2542 cm_deref_id(cm_id_priv); 2543 return 0; 2544out: 2545 cm_deref_id(cm_id_priv); 2546 return -EINVAL; 2547} 2548 2549static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2550 struct cm_id_private *cm_id_priv, 2551 struct ib_cm_sidr_req_param *param) 2552{ 2553 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2554 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2555 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2556 sidr_req_msg->pkey = param->pkey; 2557 sidr_req_msg->service_id = param->service_id; 2558 2559 if (param->private_data && param->private_data_len) 2560 memcpy(sidr_req_msg->private_data, param->private_data, 2561 param->private_data_len); 2562} 2563 2564int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2565 struct ib_cm_sidr_req_param *param) 2566{ 2567 struct cm_id_private *cm_id_priv; 2568 struct ib_mad_send_buf *msg; 2569 struct ib_send_wr *bad_send_wr; 2570 unsigned long flags; 2571 int ret; 2572 2573 if (!param->path || (param->private_data && 2574 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2575 return -EINVAL; 2576 2577 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2578 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2579 if (ret) 2580 goto out; 2581 2582 cm_id->service_id = param->service_id; 2583 cm_id->service_mask = ~0ULL; 2584 cm_id_priv->timeout_ms = param->timeout_ms; 2585 cm_id_priv->max_cm_retries = param->max_cm_retries; 2586 ret = cm_alloc_msg(cm_id_priv, &msg); 2587 if (ret) 2588 goto out; 2589 2590 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2591 param); 2592 msg->send_wr.wr.ud.timeout_ms = cm_id_priv->timeout_ms; 2593 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2594 2595 spin_lock_irqsave(&cm_id_priv->lock, flags); 2596 if (cm_id->state == IB_CM_IDLE) 2597 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2598 &msg->send_wr, &bad_send_wr); 2599 else 2600 ret = -EINVAL; 2601 2602 if (ret) { 2603 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2604 cm_free_msg(msg); 2605 goto out; 2606 } 2607 cm_id->state = IB_CM_SIDR_REQ_SENT; 2608 cm_id_priv->msg = msg; 2609 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2610out: 2611 return ret; 2612} 2613EXPORT_SYMBOL(ib_send_cm_sidr_req); 2614 2615static void cm_format_sidr_req_event(struct cm_work *work, 2616 struct ib_cm_id *listen_id) 2617{ 2618 struct cm_sidr_req_msg *sidr_req_msg; 2619 struct ib_cm_sidr_req_event_param *param; 2620 2621 sidr_req_msg = (struct cm_sidr_req_msg *) 2622 work->mad_recv_wc->recv_buf.mad; 2623 param = &work->cm_event.param.sidr_req_rcvd; 2624 param->pkey = sidr_req_msg->pkey; 2625 param->listen_id = listen_id; 2626 param->device = work->port->mad_agent->device; 2627 param->port = work->port->port_num; 2628 work->cm_event.private_data = &sidr_req_msg->private_data; 2629} 2630 2631static int cm_sidr_req_handler(struct cm_work *work) 2632{ 2633 struct ib_cm_id *cm_id; 2634 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2635 struct cm_sidr_req_msg *sidr_req_msg; 2636 struct ib_wc *wc; 2637 unsigned long flags; 2638 2639 cm_id = ib_create_cm_id(NULL, NULL); 2640 if (IS_ERR(cm_id)) 2641 return PTR_ERR(cm_id); 2642 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2643 2644 /* Record SGID/SLID and request ID for lookup. */ 2645 sidr_req_msg = (struct cm_sidr_req_msg *) 2646 work->mad_recv_wc->recv_buf.mad; 2647 wc = work->mad_recv_wc->wc; 2648 cm_id_priv->av.dgid.global.subnet_prefix = wc->slid; 2649 cm_id_priv->av.dgid.global.interface_id = 0; 2650 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2651 &cm_id_priv->av); 2652 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2653 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2654 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2655 atomic_inc(&cm_id_priv->work_count); 2656 2657 spin_lock_irqsave(&cm.lock, flags); 2658 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2659 if (cur_cm_id_priv) { 2660 spin_unlock_irqrestore(&cm.lock, flags); 2661 goto out; /* Duplicate message. */ 2662 } 2663 cur_cm_id_priv = cm_find_listen(sidr_req_msg->service_id); 2664 if (!cur_cm_id_priv) { 2665 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2666 spin_unlock_irqrestore(&cm.lock, flags); 2667 /* todo: reply with no match */ 2668 goto out; /* No match. */ 2669 } 2670 atomic_inc(&cur_cm_id_priv->refcount); 2671 spin_unlock_irqrestore(&cm.lock, flags); 2672 2673 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2674 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2675 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2676 cm_id_priv->id.service_mask = ~0ULL; 2677 2678 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2679 cm_process_work(cm_id_priv, work); 2680 cm_deref_id(cur_cm_id_priv); 2681 return 0; 2682out: 2683 ib_destroy_cm_id(&cm_id_priv->id); 2684 return -EINVAL; 2685} 2686 2687static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2688 struct cm_id_private *cm_id_priv, 2689 struct ib_cm_sidr_rep_param *param) 2690{ 2691 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2692 cm_id_priv->tid); 2693 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2694 sidr_rep_msg->status = param->status; 2695 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2696 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2697 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2698 2699 if (param->info && param->info_length) 2700 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2701 2702 if (param->private_data && param->private_data_len) 2703 memcpy(sidr_rep_msg->private_data, param->private_data, 2704 param->private_data_len); 2705} 2706 2707int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2708 struct ib_cm_sidr_rep_param *param) 2709{ 2710 struct cm_id_private *cm_id_priv; 2711 struct ib_mad_send_buf *msg; 2712 struct ib_send_wr *bad_send_wr; 2713 unsigned long flags; 2714 int ret; 2715 2716 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2717 (param->private_data && 2718 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2719 return -EINVAL; 2720 2721 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2722 spin_lock_irqsave(&cm_id_priv->lock, flags); 2723 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2724 ret = -EINVAL; 2725 goto error; 2726 } 2727 2728 ret = cm_alloc_msg(cm_id_priv, &msg); 2729 if (ret) 2730 goto error; 2731 2732 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2733 param); 2734 ret = ib_post_send_mad(cm_id_priv->av.port->mad_agent, 2735 &msg->send_wr, &bad_send_wr); 2736 if (ret) { 2737 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2738 cm_free_msg(msg); 2739 return ret; 2740 } 2741 cm_id->state = IB_CM_IDLE; 2742 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2743 2744 spin_lock_irqsave(&cm.lock, flags); 2745 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2746 spin_unlock_irqrestore(&cm.lock, flags); 2747 return 0; 2748 2749error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2750 return ret; 2751} 2752EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2753 2754static void cm_format_sidr_rep_event(struct cm_work *work) 2755{ 2756 struct cm_sidr_rep_msg *sidr_rep_msg; 2757 struct ib_cm_sidr_rep_event_param *param; 2758 2759 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2760 work->mad_recv_wc->recv_buf.mad; 2761 param = &work->cm_event.param.sidr_rep_rcvd; 2762 param->status = sidr_rep_msg->status; 2763 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2764 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2765 param->info = &sidr_rep_msg->info; 2766 param->info_len = sidr_rep_msg->info_length; 2767 work->cm_event.private_data = &sidr_rep_msg->private_data; 2768} 2769 2770static int cm_sidr_rep_handler(struct cm_work *work) 2771{ 2772 struct cm_sidr_rep_msg *sidr_rep_msg; 2773 struct cm_id_private *cm_id_priv; 2774 unsigned long flags; 2775 2776 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2777 work->mad_recv_wc->recv_buf.mad; 2778 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2779 if (!cm_id_priv) 2780 return -EINVAL; /* Unmatched reply. */ 2781 2782 spin_lock_irqsave(&cm_id_priv->lock, flags); 2783 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2784 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2785 goto out; 2786 } 2787 cm_id_priv->id.state = IB_CM_IDLE; 2788 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2789 (unsigned long) cm_id_priv->msg); 2790 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2791 2792 cm_format_sidr_rep_event(work); 2793 cm_process_work(cm_id_priv, work); 2794 return 0; 2795out: 2796 cm_deref_id(cm_id_priv); 2797 return -EINVAL; 2798} 2799 2800static void cm_process_send_error(struct ib_mad_send_buf *msg, 2801 enum ib_wc_status wc_status) 2802{ 2803 struct cm_id_private *cm_id_priv; 2804 struct ib_cm_event cm_event; 2805 enum ib_cm_state state; 2806 unsigned long flags; 2807 int ret; 2808 2809 memset(&cm_event, 0, sizeof cm_event); 2810 cm_id_priv = msg->context[0]; 2811 2812 /* Discard old sends or ones without a response. */ 2813 spin_lock_irqsave(&cm_id_priv->lock, flags); 2814 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2815 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2816 goto discard; 2817 2818 switch (state) { 2819 case IB_CM_REQ_SENT: 2820 case IB_CM_MRA_REQ_RCVD: 2821 cm_reset_to_idle(cm_id_priv); 2822 cm_event.event = IB_CM_REQ_ERROR; 2823 break; 2824 case IB_CM_REP_SENT: 2825 case IB_CM_MRA_REP_RCVD: 2826 cm_reset_to_idle(cm_id_priv); 2827 cm_event.event = IB_CM_REP_ERROR; 2828 break; 2829 case IB_CM_DREQ_SENT: 2830 cm_enter_timewait(cm_id_priv); 2831 cm_event.event = IB_CM_DREQ_ERROR; 2832 break; 2833 case IB_CM_SIDR_REQ_SENT: 2834 cm_id_priv->id.state = IB_CM_IDLE; 2835 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2836 break; 2837 default: 2838 goto discard; 2839 } 2840 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2841 cm_event.param.send_status = wc_status; 2842 2843 /* No other events can occur on the cm_id at this point. */ 2844 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2845 cm_free_msg(msg); 2846 if (ret) 2847 ib_destroy_cm_id(&cm_id_priv->id); 2848 return; 2849discard: 2850 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2851 cm_free_msg(msg); 2852} 2853 2854static void cm_send_handler(struct ib_mad_agent *mad_agent, 2855 struct ib_mad_send_wc *mad_send_wc) 2856{ 2857 struct ib_mad_send_buf *msg; 2858 2859 msg = (struct ib_mad_send_buf *)(unsigned long)mad_send_wc->wr_id; 2860 2861 switch (mad_send_wc->status) { 2862 case IB_WC_SUCCESS: 2863 case IB_WC_WR_FLUSH_ERR: 2864 cm_free_msg(msg); 2865 break; 2866 default: 2867 if (msg->context[0] && msg->context[1]) 2868 cm_process_send_error(msg, mad_send_wc->status); 2869 else 2870 cm_free_msg(msg); 2871 break; 2872 } 2873} 2874 2875static void cm_work_handler(void *data) 2876{ 2877 struct cm_work *work = data; 2878 int ret; 2879 2880 switch (work->cm_event.event) { 2881 case IB_CM_REQ_RECEIVED: 2882 ret = cm_req_handler(work); 2883 break; 2884 case IB_CM_MRA_RECEIVED: 2885 ret = cm_mra_handler(work); 2886 break; 2887 case IB_CM_REJ_RECEIVED: 2888 ret = cm_rej_handler(work); 2889 break; 2890 case IB_CM_REP_RECEIVED: 2891 ret = cm_rep_handler(work); 2892 break; 2893 case IB_CM_RTU_RECEIVED: 2894 ret = cm_rtu_handler(work); 2895 break; 2896 case IB_CM_USER_ESTABLISHED: 2897 ret = cm_establish_handler(work); 2898 break; 2899 case IB_CM_DREQ_RECEIVED: 2900 ret = cm_dreq_handler(work); 2901 break; 2902 case IB_CM_DREP_RECEIVED: 2903 ret = cm_drep_handler(work); 2904 break; 2905 case IB_CM_SIDR_REQ_RECEIVED: 2906 ret = cm_sidr_req_handler(work); 2907 break; 2908 case IB_CM_SIDR_REP_RECEIVED: 2909 ret = cm_sidr_rep_handler(work); 2910 break; 2911 case IB_CM_LAP_RECEIVED: 2912 ret = cm_lap_handler(work); 2913 break; 2914 case IB_CM_APR_RECEIVED: 2915 ret = cm_apr_handler(work); 2916 break; 2917 case IB_CM_TIMEWAIT_EXIT: 2918 ret = cm_timewait_handler(work); 2919 break; 2920 default: 2921 ret = -EINVAL; 2922 break; 2923 } 2924 if (ret) 2925 cm_free_work(work); 2926} 2927 2928int ib_cm_establish(struct ib_cm_id *cm_id) 2929{ 2930 struct cm_id_private *cm_id_priv; 2931 struct cm_work *work; 2932 unsigned long flags; 2933 int ret = 0; 2934 2935 work = kmalloc(sizeof *work, GFP_ATOMIC); 2936 if (!work) 2937 return -ENOMEM; 2938 2939 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2940 spin_lock_irqsave(&cm_id_priv->lock, flags); 2941 switch (cm_id->state) 2942 { 2943 case IB_CM_REP_SENT: 2944 case IB_CM_MRA_REP_RCVD: 2945 cm_id->state = IB_CM_ESTABLISHED; 2946 break; 2947 case IB_CM_ESTABLISHED: 2948 ret = -EISCONN; 2949 break; 2950 default: 2951 ret = -EINVAL; 2952 break; 2953 } 2954 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2955 2956 if (ret) { 2957 kfree(work); 2958 goto out; 2959 } 2960 2961 /* 2962 * The CM worker thread may try to destroy the cm_id before it 2963 * can execute this work item. To prevent potential deadlock, 2964 * we need to find the cm_id once we're in the context of the 2965 * worker thread, rather than holding a reference on it. 2966 */ 2967 INIT_WORK(&work->work, cm_work_handler, work); 2968 work->local_id = cm_id->local_id; 2969 work->remote_id = cm_id->remote_id; 2970 work->mad_recv_wc = NULL; 2971 work->cm_event.event = IB_CM_USER_ESTABLISHED; 2972 queue_work(cm.wq, &work->work); 2973out: 2974 return ret; 2975} 2976EXPORT_SYMBOL(ib_cm_establish); 2977 2978static void cm_recv_handler(struct ib_mad_agent *mad_agent, 2979 struct ib_mad_recv_wc *mad_recv_wc) 2980{ 2981 struct cm_work *work; 2982 enum ib_cm_event_type event; 2983 int paths = 0; 2984 2985 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 2986 case CM_REQ_ATTR_ID: 2987 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 2988 alt_local_lid != 0); 2989 event = IB_CM_REQ_RECEIVED; 2990 break; 2991 case CM_MRA_ATTR_ID: 2992 event = IB_CM_MRA_RECEIVED; 2993 break; 2994 case CM_REJ_ATTR_ID: 2995 event = IB_CM_REJ_RECEIVED; 2996 break; 2997 case CM_REP_ATTR_ID: 2998 event = IB_CM_REP_RECEIVED; 2999 break; 3000 case CM_RTU_ATTR_ID: 3001 event = IB_CM_RTU_RECEIVED; 3002 break; 3003 case CM_DREQ_ATTR_ID: 3004 event = IB_CM_DREQ_RECEIVED; 3005 break; 3006 case CM_DREP_ATTR_ID: 3007 event = IB_CM_DREP_RECEIVED; 3008 break; 3009 case CM_SIDR_REQ_ATTR_ID: 3010 event = IB_CM_SIDR_REQ_RECEIVED; 3011 break; 3012 case CM_SIDR_REP_ATTR_ID: 3013 event = IB_CM_SIDR_REP_RECEIVED; 3014 break; 3015 case CM_LAP_ATTR_ID: 3016 paths = 1; 3017 event = IB_CM_LAP_RECEIVED; 3018 break; 3019 case CM_APR_ATTR_ID: 3020 event = IB_CM_APR_RECEIVED; 3021 break; 3022 default: 3023 ib_free_recv_mad(mad_recv_wc); 3024 return; 3025 } 3026 3027 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3028 GFP_KERNEL); 3029 if (!work) { 3030 ib_free_recv_mad(mad_recv_wc); 3031 return; 3032 } 3033 3034 INIT_WORK(&work->work, cm_work_handler, work); 3035 work->cm_event.event = event; 3036 work->mad_recv_wc = mad_recv_wc; 3037 work->port = (struct cm_port *)mad_agent->context; 3038 queue_work(cm.wq, &work->work); 3039} 3040 3041static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3042 struct ib_qp_attr *qp_attr, 3043 int *qp_attr_mask) 3044{ 3045 unsigned long flags; 3046 int ret; 3047 3048 spin_lock_irqsave(&cm_id_priv->lock, flags); 3049 switch (cm_id_priv->id.state) { 3050 case IB_CM_REQ_SENT: 3051 case IB_CM_MRA_REQ_RCVD: 3052 case IB_CM_REQ_RCVD: 3053 case IB_CM_MRA_REQ_SENT: 3054 case IB_CM_REP_RCVD: 3055 case IB_CM_MRA_REP_SENT: 3056 case IB_CM_REP_SENT: 3057 case IB_CM_MRA_REP_RCVD: 3058 case IB_CM_ESTABLISHED: 3059 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3060 IB_QP_PKEY_INDEX | IB_QP_PORT; 3061 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE; 3062 if (cm_id_priv->responder_resources) 3063 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_WRITE | 3064 IB_ACCESS_REMOTE_READ; 3065 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3066 qp_attr->port_num = cm_id_priv->av.port->port_num; 3067 ret = 0; 3068 break; 3069 default: 3070 ret = -EINVAL; 3071 break; 3072 } 3073 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3074 return ret; 3075} 3076 3077static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3078 struct ib_qp_attr *qp_attr, 3079 int *qp_attr_mask) 3080{ 3081 unsigned long flags; 3082 int ret; 3083 3084 spin_lock_irqsave(&cm_id_priv->lock, flags); 3085 switch (cm_id_priv->id.state) { 3086 case IB_CM_REQ_RCVD: 3087 case IB_CM_MRA_REQ_SENT: 3088 case IB_CM_REP_RCVD: 3089 case IB_CM_MRA_REP_SENT: 3090 case IB_CM_REP_SENT: 3091 case IB_CM_MRA_REP_RCVD: 3092 case IB_CM_ESTABLISHED: 3093 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3094 IB_QP_DEST_QPN | IB_QP_RQ_PSN | 3095 IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 3096 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3097 qp_attr->path_mtu = cm_id_priv->path_mtu; 3098 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3099 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3100 qp_attr->max_dest_rd_atomic = cm_id_priv->responder_resources; 3101 qp_attr->min_rnr_timer = 0; 3102 if (cm_id_priv->alt_av.ah_attr.dlid) { 3103 *qp_attr_mask |= IB_QP_ALT_PATH; 3104 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3105 } 3106 ret = 0; 3107 break; 3108 default: 3109 ret = -EINVAL; 3110 break; 3111 } 3112 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3113 return ret; 3114} 3115 3116static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3117 struct ib_qp_attr *qp_attr, 3118 int *qp_attr_mask) 3119{ 3120 unsigned long flags; 3121 int ret; 3122 3123 spin_lock_irqsave(&cm_id_priv->lock, flags); 3124 switch (cm_id_priv->id.state) { 3125 case IB_CM_REP_RCVD: 3126 case IB_CM_MRA_REP_SENT: 3127 case IB_CM_REP_SENT: 3128 case IB_CM_MRA_REP_RCVD: 3129 case IB_CM_ESTABLISHED: 3130 *qp_attr_mask = IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3131 IB_QP_RNR_RETRY | IB_QP_SQ_PSN | 3132 IB_QP_MAX_QP_RD_ATOMIC; 3133 qp_attr->timeout = cm_id_priv->local_ack_timeout; 3134 qp_attr->retry_cnt = cm_id_priv->retry_count; 3135 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3136 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3137 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3138 if (cm_id_priv->alt_av.ah_attr.dlid) { 3139 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3140 qp_attr->path_mig_state = IB_MIG_REARM; 3141 } 3142 ret = 0; 3143 break; 3144 default: 3145 ret = -EINVAL; 3146 break; 3147 } 3148 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3149 return ret; 3150} 3151 3152int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3153 struct ib_qp_attr *qp_attr, 3154 int *qp_attr_mask) 3155{ 3156 struct cm_id_private *cm_id_priv; 3157 int ret; 3158 3159 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3160 switch (qp_attr->qp_state) { 3161 case IB_QPS_INIT: 3162 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3163 break; 3164 case IB_QPS_RTR: 3165 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3166 break; 3167 case IB_QPS_RTS: 3168 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3169 break; 3170 default: 3171 ret = -EINVAL; 3172 break; 3173 } 3174 return ret; 3175} 3176EXPORT_SYMBOL(ib_cm_init_qp_attr); 3177 3178static u64 cm_get_ca_guid(struct ib_device *device) 3179{ 3180 struct ib_device_attr *device_attr; 3181 u64 guid; 3182 int ret; 3183 3184 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 3185 if (!device_attr) 3186 return 0; 3187 3188 ret = ib_query_device(device, device_attr); 3189 guid = ret ? 0 : device_attr->node_guid; 3190 kfree(device_attr); 3191 return guid; 3192} 3193 3194static void cm_add_one(struct ib_device *device) 3195{ 3196 struct cm_device *cm_dev; 3197 struct cm_port *port; 3198 struct ib_mad_reg_req reg_req = { 3199 .mgmt_class = IB_MGMT_CLASS_CM, 3200 .mgmt_class_version = IB_CM_CLASS_VERSION 3201 }; 3202 struct ib_port_modify port_modify = { 3203 .set_port_cap_mask = IB_PORT_CM_SUP 3204 }; 3205 unsigned long flags; 3206 int ret; 3207 u8 i; 3208 3209 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3210 device->phys_port_cnt, GFP_KERNEL); 3211 if (!cm_dev) 3212 return; 3213 3214 cm_dev->device = device; 3215 cm_dev->ca_guid = cm_get_ca_guid(device); 3216 if (!cm_dev->ca_guid) 3217 goto error1; 3218 3219 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3220 for (i = 1; i <= device->phys_port_cnt; i++) { 3221 port = &cm_dev->port[i-1]; 3222 port->cm_dev = cm_dev; 3223 port->port_num = i; 3224 port->mad_agent = ib_register_mad_agent(device, i, 3225 IB_QPT_GSI, 3226 ®_req, 3227 0, 3228 cm_send_handler, 3229 cm_recv_handler, 3230 port); 3231 if (IS_ERR(port->mad_agent)) 3232 goto error2; 3233 3234 ret = ib_modify_port(device, i, 0, &port_modify); 3235 if (ret) 3236 goto error3; 3237 } 3238 ib_set_client_data(device, &cm_client, cm_dev); 3239 3240 write_lock_irqsave(&cm.device_lock, flags); 3241 list_add_tail(&cm_dev->list, &cm.device_list); 3242 write_unlock_irqrestore(&cm.device_lock, flags); 3243 return; 3244 3245error3: 3246 ib_unregister_mad_agent(port->mad_agent); 3247error2: 3248 port_modify.set_port_cap_mask = 0; 3249 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3250 while (--i) { 3251 port = &cm_dev->port[i-1]; 3252 ib_modify_port(device, port->port_num, 0, &port_modify); 3253 ib_unregister_mad_agent(port->mad_agent); 3254 } 3255error1: 3256 kfree(cm_dev); 3257} 3258 3259static void cm_remove_one(struct ib_device *device) 3260{ 3261 struct cm_device *cm_dev; 3262 struct cm_port *port; 3263 struct ib_port_modify port_modify = { 3264 .clr_port_cap_mask = IB_PORT_CM_SUP 3265 }; 3266 unsigned long flags; 3267 int i; 3268 3269 cm_dev = ib_get_client_data(device, &cm_client); 3270 if (!cm_dev) 3271 return; 3272 3273 write_lock_irqsave(&cm.device_lock, flags); 3274 list_del(&cm_dev->list); 3275 write_unlock_irqrestore(&cm.device_lock, flags); 3276 3277 for (i = 1; i <= device->phys_port_cnt; i++) { 3278 port = &cm_dev->port[i-1]; 3279 ib_modify_port(device, port->port_num, 0, &port_modify); 3280 ib_unregister_mad_agent(port->mad_agent); 3281 } 3282 kfree(cm_dev); 3283} 3284 3285static int __init ib_cm_init(void) 3286{ 3287 int ret; 3288 3289 memset(&cm, 0, sizeof cm); 3290 INIT_LIST_HEAD(&cm.device_list); 3291 rwlock_init(&cm.device_lock); 3292 spin_lock_init(&cm.lock); 3293 cm.listen_service_table = RB_ROOT; 3294 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3295 cm.remote_id_table = RB_ROOT; 3296 cm.remote_qp_table = RB_ROOT; 3297 cm.remote_sidr_table = RB_ROOT; 3298 idr_init(&cm.local_id_table); 3299 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3300 3301 cm.wq = create_workqueue("ib_cm"); 3302 if (!cm.wq) 3303 return -ENOMEM; 3304 3305 ret = ib_register_client(&cm_client); 3306 if (ret) 3307 goto error; 3308 3309 return 0; 3310error: 3311 destroy_workqueue(cm.wq); 3312 return ret; 3313} 3314 3315static void __exit ib_cm_cleanup(void) 3316{ 3317 flush_workqueue(cm.wq); 3318 destroy_workqueue(cm.wq); 3319 ib_unregister_client(&cm_client); 3320} 3321 3322module_init(ib_cm_init); 3323module_exit(ib_cm_cleanup); 3324 3325