cm.c revision 34816ad98efe4d47ffd858a0345321f9d85d9420
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 <rdma/ib_cache.h> 47#include <rdma/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 __be64 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 __be32 local_id; /* Established / timewait */ 104 __be32 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 __be64 remote_ca_guid; 114 __be32 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 __be64 tid; 136 __be32 local_qpn; 137 __be32 remote_qpn; 138 enum ib_qp_type qp_type; 139 __be32 sq_psn; 140 __be32 rq_psn; 141 int timeout_ms; 142 enum ib_mtu path_mtu; 143 u8 private_data_len; 144 u8 max_cm_retries; 145 u8 peer_to_peer; 146 u8 responder_resources; 147 u8 initiator_depth; 148 u8 local_ack_timeout; 149 u8 retry_count; 150 u8 rnr_retry_count; 151 u8 service_timeout; 152 153 struct list_head work_list; 154 atomic_t work_count; 155}; 156 157static void cm_work_handler(void *data); 158 159static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 160{ 161 if (atomic_dec_and_test(&cm_id_priv->refcount)) 162 wake_up(&cm_id_priv->wait); 163} 164 165static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 166 struct ib_mad_send_buf **msg) 167{ 168 struct ib_mad_agent *mad_agent; 169 struct ib_mad_send_buf *m; 170 struct ib_ah *ah; 171 172 mad_agent = cm_id_priv->av.port->mad_agent; 173 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 174 if (IS_ERR(ah)) 175 return PTR_ERR(ah); 176 177 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 178 cm_id_priv->av.pkey_index, 179 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 180 GFP_ATOMIC); 181 if (IS_ERR(m)) { 182 ib_destroy_ah(ah); 183 return PTR_ERR(m); 184 } 185 186 /* Timeout set by caller if response is expected. */ 187 m->ah = ah; 188 m->retries = cm_id_priv->max_cm_retries; 189 190 atomic_inc(&cm_id_priv->refcount); 191 m->context[0] = cm_id_priv; 192 *msg = m; 193 return 0; 194} 195 196static int cm_alloc_response_msg(struct cm_port *port, 197 struct ib_mad_recv_wc *mad_recv_wc, 198 struct ib_mad_send_buf **msg) 199{ 200 struct ib_mad_send_buf *m; 201 struct ib_ah *ah; 202 203 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 204 mad_recv_wc->recv_buf.grh, port->port_num); 205 if (IS_ERR(ah)) 206 return PTR_ERR(ah); 207 208 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 209 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 210 GFP_ATOMIC); 211 if (IS_ERR(m)) { 212 ib_destroy_ah(ah); 213 return PTR_ERR(m); 214 } 215 m->ah = ah; 216 *msg = m; 217 return 0; 218} 219 220static void cm_free_msg(struct ib_mad_send_buf *msg) 221{ 222 ib_destroy_ah(msg->ah); 223 if (msg->context[0]) 224 cm_deref_id(msg->context[0]); 225 ib_free_send_mad(msg); 226} 227 228static void * cm_copy_private_data(const void *private_data, 229 u8 private_data_len) 230{ 231 void *data; 232 233 if (!private_data || !private_data_len) 234 return NULL; 235 236 data = kmalloc(private_data_len, GFP_KERNEL); 237 if (!data) 238 return ERR_PTR(-ENOMEM); 239 240 memcpy(data, private_data, private_data_len); 241 return data; 242} 243 244static void cm_set_private_data(struct cm_id_private *cm_id_priv, 245 void *private_data, u8 private_data_len) 246{ 247 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 248 kfree(cm_id_priv->private_data); 249 250 cm_id_priv->private_data = private_data; 251 cm_id_priv->private_data_len = private_data_len; 252} 253 254static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num, 255 u16 dlid, u8 sl, u16 src_path_bits) 256{ 257 memset(ah_attr, 0, sizeof ah_attr); 258 ah_attr->dlid = dlid; 259 ah_attr->sl = sl; 260 ah_attr->src_path_bits = src_path_bits; 261 ah_attr->port_num = port_num; 262} 263 264static void cm_init_av_for_response(struct cm_port *port, 265 struct ib_wc *wc, struct cm_av *av) 266{ 267 av->port = port; 268 av->pkey_index = wc->pkey_index; 269 cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid, 270 wc->sl, wc->dlid_path_bits); 271} 272 273static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 274{ 275 struct cm_device *cm_dev; 276 struct cm_port *port = NULL; 277 unsigned long flags; 278 int ret; 279 u8 p; 280 281 read_lock_irqsave(&cm.device_lock, flags); 282 list_for_each_entry(cm_dev, &cm.device_list, list) { 283 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 284 &p, NULL)) { 285 port = &cm_dev->port[p-1]; 286 break; 287 } 288 } 289 read_unlock_irqrestore(&cm.device_lock, flags); 290 291 if (!port) 292 return -EINVAL; 293 294 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 295 be16_to_cpu(path->pkey), &av->pkey_index); 296 if (ret) 297 return ret; 298 299 av->port = port; 300 cm_set_ah_attr(&av->ah_attr, av->port->port_num, 301 be16_to_cpu(path->dlid), path->sl, 302 be16_to_cpu(path->slid) & 0x7F); 303 av->packet_life_time = path->packet_life_time; 304 return 0; 305} 306 307static int cm_alloc_id(struct cm_id_private *cm_id_priv) 308{ 309 unsigned long flags; 310 int ret; 311 312 do { 313 spin_lock_irqsave(&cm.lock, flags); 314 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 1, 315 (__force int *) &cm_id_priv->id.local_id); 316 spin_unlock_irqrestore(&cm.lock, flags); 317 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 318 return ret; 319} 320 321static void cm_free_id(__be32 local_id) 322{ 323 unsigned long flags; 324 325 spin_lock_irqsave(&cm.lock, flags); 326 idr_remove(&cm.local_id_table, (__force int) local_id); 327 spin_unlock_irqrestore(&cm.lock, flags); 328} 329 330static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 331{ 332 struct cm_id_private *cm_id_priv; 333 334 cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id); 335 if (cm_id_priv) { 336 if (cm_id_priv->id.remote_id == remote_id) 337 atomic_inc(&cm_id_priv->refcount); 338 else 339 cm_id_priv = NULL; 340 } 341 342 return cm_id_priv; 343} 344 345static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 346{ 347 struct cm_id_private *cm_id_priv; 348 unsigned long flags; 349 350 spin_lock_irqsave(&cm.lock, flags); 351 cm_id_priv = cm_get_id(local_id, remote_id); 352 spin_unlock_irqrestore(&cm.lock, flags); 353 354 return cm_id_priv; 355} 356 357static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 358{ 359 struct rb_node **link = &cm.listen_service_table.rb_node; 360 struct rb_node *parent = NULL; 361 struct cm_id_private *cur_cm_id_priv; 362 __be64 service_id = cm_id_priv->id.service_id; 363 __be64 service_mask = cm_id_priv->id.service_mask; 364 365 while (*link) { 366 parent = *link; 367 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 368 service_node); 369 if ((cur_cm_id_priv->id.service_mask & service_id) == 370 (service_mask & cur_cm_id_priv->id.service_id) && 371 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 372 return cur_cm_id_priv; 373 374 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 375 link = &(*link)->rb_left; 376 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 377 link = &(*link)->rb_right; 378 else if (service_id < cur_cm_id_priv->id.service_id) 379 link = &(*link)->rb_left; 380 else 381 link = &(*link)->rb_right; 382 } 383 rb_link_node(&cm_id_priv->service_node, parent, link); 384 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 385 return NULL; 386} 387 388static struct cm_id_private * cm_find_listen(struct ib_device *device, 389 __be64 service_id) 390{ 391 struct rb_node *node = cm.listen_service_table.rb_node; 392 struct cm_id_private *cm_id_priv; 393 394 while (node) { 395 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 396 if ((cm_id_priv->id.service_mask & service_id) == 397 cm_id_priv->id.service_id && 398 (cm_id_priv->id.device == device)) 399 return cm_id_priv; 400 401 if (device < cm_id_priv->id.device) 402 node = node->rb_left; 403 else if (device > cm_id_priv->id.device) 404 node = node->rb_right; 405 else if (service_id < cm_id_priv->id.service_id) 406 node = node->rb_left; 407 else 408 node = node->rb_right; 409 } 410 return NULL; 411} 412 413static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 414 *timewait_info) 415{ 416 struct rb_node **link = &cm.remote_id_table.rb_node; 417 struct rb_node *parent = NULL; 418 struct cm_timewait_info *cur_timewait_info; 419 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 420 __be32 remote_id = timewait_info->work.remote_id; 421 422 while (*link) { 423 parent = *link; 424 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 425 remote_id_node); 426 if (remote_id < cur_timewait_info->work.remote_id) 427 link = &(*link)->rb_left; 428 else if (remote_id > cur_timewait_info->work.remote_id) 429 link = &(*link)->rb_right; 430 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 431 link = &(*link)->rb_left; 432 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 433 link = &(*link)->rb_right; 434 else 435 return cur_timewait_info; 436 } 437 timewait_info->inserted_remote_id = 1; 438 rb_link_node(&timewait_info->remote_id_node, parent, link); 439 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 440 return NULL; 441} 442 443static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 444 __be32 remote_id) 445{ 446 struct rb_node *node = cm.remote_id_table.rb_node; 447 struct cm_timewait_info *timewait_info; 448 449 while (node) { 450 timewait_info = rb_entry(node, struct cm_timewait_info, 451 remote_id_node); 452 if (remote_id < timewait_info->work.remote_id) 453 node = node->rb_left; 454 else if (remote_id > timewait_info->work.remote_id) 455 node = node->rb_right; 456 else if (remote_ca_guid < timewait_info->remote_ca_guid) 457 node = node->rb_left; 458 else if (remote_ca_guid > timewait_info->remote_ca_guid) 459 node = node->rb_right; 460 else 461 return timewait_info; 462 } 463 return NULL; 464} 465 466static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 467 *timewait_info) 468{ 469 struct rb_node **link = &cm.remote_qp_table.rb_node; 470 struct rb_node *parent = NULL; 471 struct cm_timewait_info *cur_timewait_info; 472 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 473 __be32 remote_qpn = timewait_info->remote_qpn; 474 475 while (*link) { 476 parent = *link; 477 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 478 remote_qp_node); 479 if (remote_qpn < cur_timewait_info->remote_qpn) 480 link = &(*link)->rb_left; 481 else if (remote_qpn > cur_timewait_info->remote_qpn) 482 link = &(*link)->rb_right; 483 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 484 link = &(*link)->rb_left; 485 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 486 link = &(*link)->rb_right; 487 else 488 return cur_timewait_info; 489 } 490 timewait_info->inserted_remote_qp = 1; 491 rb_link_node(&timewait_info->remote_qp_node, parent, link); 492 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 493 return NULL; 494} 495 496static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 497 *cm_id_priv) 498{ 499 struct rb_node **link = &cm.remote_sidr_table.rb_node; 500 struct rb_node *parent = NULL; 501 struct cm_id_private *cur_cm_id_priv; 502 union ib_gid *port_gid = &cm_id_priv->av.dgid; 503 __be32 remote_id = cm_id_priv->id.remote_id; 504 505 while (*link) { 506 parent = *link; 507 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 508 sidr_id_node); 509 if (remote_id < cur_cm_id_priv->id.remote_id) 510 link = &(*link)->rb_left; 511 else if (remote_id > cur_cm_id_priv->id.remote_id) 512 link = &(*link)->rb_right; 513 else { 514 int cmp; 515 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 516 sizeof *port_gid); 517 if (cmp < 0) 518 link = &(*link)->rb_left; 519 else if (cmp > 0) 520 link = &(*link)->rb_right; 521 else 522 return cur_cm_id_priv; 523 } 524 } 525 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 526 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 527 return NULL; 528} 529 530static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 531 enum ib_cm_sidr_status status) 532{ 533 struct ib_cm_sidr_rep_param param; 534 535 memset(¶m, 0, sizeof param); 536 param.status = status; 537 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 538} 539 540struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 541 ib_cm_handler cm_handler, 542 void *context) 543{ 544 struct cm_id_private *cm_id_priv; 545 int ret; 546 547 cm_id_priv = kmalloc(sizeof *cm_id_priv, GFP_KERNEL); 548 if (!cm_id_priv) 549 return ERR_PTR(-ENOMEM); 550 551 memset(cm_id_priv, 0, sizeof *cm_id_priv); 552 cm_id_priv->id.state = IB_CM_IDLE; 553 cm_id_priv->id.device = device; 554 cm_id_priv->id.cm_handler = cm_handler; 555 cm_id_priv->id.context = context; 556 cm_id_priv->id.remote_cm_qpn = 1; 557 ret = cm_alloc_id(cm_id_priv); 558 if (ret) 559 goto error; 560 561 spin_lock_init(&cm_id_priv->lock); 562 init_waitqueue_head(&cm_id_priv->wait); 563 INIT_LIST_HEAD(&cm_id_priv->work_list); 564 atomic_set(&cm_id_priv->work_count, -1); 565 atomic_set(&cm_id_priv->refcount, 1); 566 return &cm_id_priv->id; 567 568error: 569 kfree(cm_id_priv); 570 return ERR_PTR(-ENOMEM); 571} 572EXPORT_SYMBOL(ib_create_cm_id); 573 574static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 575{ 576 struct cm_work *work; 577 578 if (list_empty(&cm_id_priv->work_list)) 579 return NULL; 580 581 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 582 list_del(&work->list); 583 return work; 584} 585 586static void cm_free_work(struct cm_work *work) 587{ 588 if (work->mad_recv_wc) 589 ib_free_recv_mad(work->mad_recv_wc); 590 kfree(work); 591} 592 593static inline int cm_convert_to_ms(int iba_time) 594{ 595 /* approximate conversion to ms from 4.096us x 2^iba_time */ 596 return 1 << max(iba_time - 8, 0); 597} 598 599static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 600{ 601 unsigned long flags; 602 603 if (!timewait_info->inserted_remote_id && 604 !timewait_info->inserted_remote_qp) 605 return; 606 607 spin_lock_irqsave(&cm.lock, flags); 608 if (timewait_info->inserted_remote_id) { 609 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 610 timewait_info->inserted_remote_id = 0; 611 } 612 613 if (timewait_info->inserted_remote_qp) { 614 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 615 timewait_info->inserted_remote_qp = 0; 616 } 617 spin_unlock_irqrestore(&cm.lock, flags); 618} 619 620static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 621{ 622 struct cm_timewait_info *timewait_info; 623 624 timewait_info = kmalloc(sizeof *timewait_info, GFP_KERNEL); 625 if (!timewait_info) 626 return ERR_PTR(-ENOMEM); 627 memset(timewait_info, 0, sizeof *timewait_info); 628 629 timewait_info->work.local_id = local_id; 630 INIT_WORK(&timewait_info->work.work, cm_work_handler, 631 &timewait_info->work); 632 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 633 return timewait_info; 634} 635 636static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 637{ 638 int wait_time; 639 640 /* 641 * The cm_id could be destroyed by the user before we exit timewait. 642 * To protect against this, we search for the cm_id after exiting 643 * timewait before notifying the user that we've exited timewait. 644 */ 645 cm_id_priv->id.state = IB_CM_TIMEWAIT; 646 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout); 647 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 648 msecs_to_jiffies(wait_time)); 649 cm_id_priv->timewait_info = NULL; 650} 651 652static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 653{ 654 cm_id_priv->id.state = IB_CM_IDLE; 655 if (cm_id_priv->timewait_info) { 656 cm_cleanup_timewait(cm_id_priv->timewait_info); 657 kfree(cm_id_priv->timewait_info); 658 cm_id_priv->timewait_info = NULL; 659 } 660} 661 662void ib_destroy_cm_id(struct ib_cm_id *cm_id) 663{ 664 struct cm_id_private *cm_id_priv; 665 struct cm_work *work; 666 unsigned long flags; 667 668 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 669retest: 670 spin_lock_irqsave(&cm_id_priv->lock, flags); 671 switch (cm_id->state) { 672 case IB_CM_LISTEN: 673 cm_id->state = IB_CM_IDLE; 674 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 675 spin_lock_irqsave(&cm.lock, flags); 676 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 677 spin_unlock_irqrestore(&cm.lock, flags); 678 break; 679 case IB_CM_SIDR_REQ_SENT: 680 cm_id->state = IB_CM_IDLE; 681 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 682 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 683 break; 684 case IB_CM_SIDR_REQ_RCVD: 685 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 686 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 687 break; 688 case IB_CM_REQ_SENT: 689 case IB_CM_MRA_REQ_RCVD: 690 case IB_CM_REP_SENT: 691 case IB_CM_MRA_REP_RCVD: 692 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 693 /* Fall through */ 694 case IB_CM_REQ_RCVD: 695 case IB_CM_MRA_REQ_SENT: 696 case IB_CM_REP_RCVD: 697 case IB_CM_MRA_REP_SENT: 698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 699 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 700 &cm_id_priv->av.port->cm_dev->ca_guid, 701 sizeof cm_id_priv->av.port->cm_dev->ca_guid, 702 NULL, 0); 703 break; 704 case IB_CM_ESTABLISHED: 705 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 706 ib_send_cm_dreq(cm_id, NULL, 0); 707 goto retest; 708 case IB_CM_DREQ_SENT: 709 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 710 cm_enter_timewait(cm_id_priv); 711 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 712 break; 713 case IB_CM_DREQ_RCVD: 714 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 715 ib_send_cm_drep(cm_id, NULL, 0); 716 break; 717 default: 718 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 719 break; 720 } 721 722 cm_free_id(cm_id->local_id); 723 atomic_dec(&cm_id_priv->refcount); 724 wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount)); 725 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 726 cm_free_work(work); 727 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 728 kfree(cm_id_priv->private_data); 729 kfree(cm_id_priv); 730} 731EXPORT_SYMBOL(ib_destroy_cm_id); 732 733int ib_cm_listen(struct ib_cm_id *cm_id, 734 __be64 service_id, 735 __be64 service_mask) 736{ 737 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 738 unsigned long flags; 739 int ret = 0; 740 741 service_mask = service_mask ? service_mask : 742 __constant_cpu_to_be64(~0ULL); 743 service_id &= service_mask; 744 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 745 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 746 return -EINVAL; 747 748 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 749 BUG_ON(cm_id->state != IB_CM_IDLE); 750 751 cm_id->state = IB_CM_LISTEN; 752 753 spin_lock_irqsave(&cm.lock, flags); 754 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 755 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 756 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 757 } else { 758 cm_id->service_id = service_id; 759 cm_id->service_mask = service_mask; 760 } 761 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 762 spin_unlock_irqrestore(&cm.lock, flags); 763 764 if (cur_cm_id_priv) { 765 cm_id->state = IB_CM_IDLE; 766 ret = -EBUSY; 767 } 768 return ret; 769} 770EXPORT_SYMBOL(ib_cm_listen); 771 772static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 773 enum cm_msg_sequence msg_seq) 774{ 775 u64 hi_tid, low_tid; 776 777 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 778 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 779 (msg_seq << 30)); 780 return cpu_to_be64(hi_tid | low_tid); 781} 782 783static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 784 __be16 attr_id, __be64 tid) 785{ 786 hdr->base_version = IB_MGMT_BASE_VERSION; 787 hdr->mgmt_class = IB_MGMT_CLASS_CM; 788 hdr->class_version = IB_CM_CLASS_VERSION; 789 hdr->method = IB_MGMT_METHOD_SEND; 790 hdr->attr_id = attr_id; 791 hdr->tid = tid; 792} 793 794static void cm_format_req(struct cm_req_msg *req_msg, 795 struct cm_id_private *cm_id_priv, 796 struct ib_cm_req_param *param) 797{ 798 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 799 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 800 801 req_msg->local_comm_id = cm_id_priv->id.local_id; 802 req_msg->service_id = param->service_id; 803 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 804 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 805 cm_req_set_resp_res(req_msg, param->responder_resources); 806 cm_req_set_init_depth(req_msg, param->initiator_depth); 807 cm_req_set_remote_resp_timeout(req_msg, 808 param->remote_cm_response_timeout); 809 cm_req_set_qp_type(req_msg, param->qp_type); 810 cm_req_set_flow_ctrl(req_msg, param->flow_control); 811 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 812 cm_req_set_local_resp_timeout(req_msg, 813 param->local_cm_response_timeout); 814 cm_req_set_retry_count(req_msg, param->retry_count); 815 req_msg->pkey = param->primary_path->pkey; 816 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 817 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 818 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 819 cm_req_set_srq(req_msg, param->srq); 820 821 req_msg->primary_local_lid = param->primary_path->slid; 822 req_msg->primary_remote_lid = param->primary_path->dlid; 823 req_msg->primary_local_gid = param->primary_path->sgid; 824 req_msg->primary_remote_gid = param->primary_path->dgid; 825 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 826 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 827 req_msg->primary_traffic_class = param->primary_path->traffic_class; 828 req_msg->primary_hop_limit = param->primary_path->hop_limit; 829 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 830 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 831 cm_req_set_primary_local_ack_timeout(req_msg, 832 min(31, param->primary_path->packet_life_time + 1)); 833 834 if (param->alternate_path) { 835 req_msg->alt_local_lid = param->alternate_path->slid; 836 req_msg->alt_remote_lid = param->alternate_path->dlid; 837 req_msg->alt_local_gid = param->alternate_path->sgid; 838 req_msg->alt_remote_gid = param->alternate_path->dgid; 839 cm_req_set_alt_flow_label(req_msg, 840 param->alternate_path->flow_label); 841 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 842 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 843 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 844 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 845 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 846 cm_req_set_alt_local_ack_timeout(req_msg, 847 min(31, param->alternate_path->packet_life_time + 1)); 848 } 849 850 if (param->private_data && param->private_data_len) 851 memcpy(req_msg->private_data, param->private_data, 852 param->private_data_len); 853} 854 855static inline int cm_validate_req_param(struct ib_cm_req_param *param) 856{ 857 /* peer-to-peer not supported */ 858 if (param->peer_to_peer) 859 return -EINVAL; 860 861 if (!param->primary_path) 862 return -EINVAL; 863 864 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 865 return -EINVAL; 866 867 if (param->private_data && 868 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 869 return -EINVAL; 870 871 if (param->alternate_path && 872 (param->alternate_path->pkey != param->primary_path->pkey || 873 param->alternate_path->mtu != param->primary_path->mtu)) 874 return -EINVAL; 875 876 return 0; 877} 878 879int ib_send_cm_req(struct ib_cm_id *cm_id, 880 struct ib_cm_req_param *param) 881{ 882 struct cm_id_private *cm_id_priv; 883 struct cm_req_msg *req_msg; 884 unsigned long flags; 885 int ret; 886 887 ret = cm_validate_req_param(param); 888 if (ret) 889 return ret; 890 891 /* Verify that we're not in timewait. */ 892 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 893 spin_lock_irqsave(&cm_id_priv->lock, flags); 894 if (cm_id->state != IB_CM_IDLE) { 895 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 896 ret = -EINVAL; 897 goto out; 898 } 899 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 900 901 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 902 id.local_id); 903 if (IS_ERR(cm_id_priv->timewait_info)) 904 goto out; 905 906 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 907 if (ret) 908 goto error1; 909 if (param->alternate_path) { 910 ret = cm_init_av_by_path(param->alternate_path, 911 &cm_id_priv->alt_av); 912 if (ret) 913 goto error1; 914 } 915 cm_id->service_id = param->service_id; 916 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 917 cm_id_priv->timeout_ms = cm_convert_to_ms( 918 param->primary_path->packet_life_time) * 2 + 919 cm_convert_to_ms( 920 param->remote_cm_response_timeout); 921 cm_id_priv->max_cm_retries = param->max_cm_retries; 922 cm_id_priv->initiator_depth = param->initiator_depth; 923 cm_id_priv->responder_resources = param->responder_resources; 924 cm_id_priv->retry_count = param->retry_count; 925 cm_id_priv->path_mtu = param->primary_path->mtu; 926 cm_id_priv->qp_type = param->qp_type; 927 928 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 929 if (ret) 930 goto error1; 931 932 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 933 cm_format_req(req_msg, cm_id_priv, param); 934 cm_id_priv->tid = req_msg->hdr.tid; 935 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 936 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 937 938 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 939 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 940 cm_id_priv->local_ack_timeout = 941 cm_req_get_primary_local_ack_timeout(req_msg); 942 943 spin_lock_irqsave(&cm_id_priv->lock, flags); 944 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 945 if (ret) { 946 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 947 goto error2; 948 } 949 BUG_ON(cm_id->state != IB_CM_IDLE); 950 cm_id->state = IB_CM_REQ_SENT; 951 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 952 return 0; 953 954error2: cm_free_msg(cm_id_priv->msg); 955error1: kfree(cm_id_priv->timewait_info); 956out: return ret; 957} 958EXPORT_SYMBOL(ib_send_cm_req); 959 960static int cm_issue_rej(struct cm_port *port, 961 struct ib_mad_recv_wc *mad_recv_wc, 962 enum ib_cm_rej_reason reason, 963 enum cm_msg_response msg_rejected, 964 void *ari, u8 ari_length) 965{ 966 struct ib_mad_send_buf *msg = NULL; 967 struct cm_rej_msg *rej_msg, *rcv_msg; 968 int ret; 969 970 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 971 if (ret) 972 return ret; 973 974 /* We just need common CM header information. Cast to any message. */ 975 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 976 rej_msg = (struct cm_rej_msg *) msg->mad; 977 978 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 979 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 980 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 981 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 982 rej_msg->reason = cpu_to_be16(reason); 983 984 if (ari && ari_length) { 985 cm_rej_set_reject_info_len(rej_msg, ari_length); 986 memcpy(rej_msg->ari, ari, ari_length); 987 } 988 989 ret = ib_post_send_mad(msg, NULL); 990 if (ret) 991 cm_free_msg(msg); 992 993 return ret; 994} 995 996static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 997 __be32 local_qpn, __be32 remote_qpn) 998{ 999 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1000 ((local_ca_guid == remote_ca_guid) && 1001 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1002} 1003 1004static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1005 struct ib_sa_path_rec *primary_path, 1006 struct ib_sa_path_rec *alt_path) 1007{ 1008 memset(primary_path, 0, sizeof *primary_path); 1009 primary_path->dgid = req_msg->primary_local_gid; 1010 primary_path->sgid = req_msg->primary_remote_gid; 1011 primary_path->dlid = req_msg->primary_local_lid; 1012 primary_path->slid = req_msg->primary_remote_lid; 1013 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1014 primary_path->hop_limit = req_msg->primary_hop_limit; 1015 primary_path->traffic_class = req_msg->primary_traffic_class; 1016 primary_path->reversible = 1; 1017 primary_path->pkey = req_msg->pkey; 1018 primary_path->sl = cm_req_get_primary_sl(req_msg); 1019 primary_path->mtu_selector = IB_SA_EQ; 1020 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1021 primary_path->rate_selector = IB_SA_EQ; 1022 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1023 primary_path->packet_life_time_selector = IB_SA_EQ; 1024 primary_path->packet_life_time = 1025 cm_req_get_primary_local_ack_timeout(req_msg); 1026 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1027 1028 if (req_msg->alt_local_lid) { 1029 memset(alt_path, 0, sizeof *alt_path); 1030 alt_path->dgid = req_msg->alt_local_gid; 1031 alt_path->sgid = req_msg->alt_remote_gid; 1032 alt_path->dlid = req_msg->alt_local_lid; 1033 alt_path->slid = req_msg->alt_remote_lid; 1034 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1035 alt_path->hop_limit = req_msg->alt_hop_limit; 1036 alt_path->traffic_class = req_msg->alt_traffic_class; 1037 alt_path->reversible = 1; 1038 alt_path->pkey = req_msg->pkey; 1039 alt_path->sl = cm_req_get_alt_sl(req_msg); 1040 alt_path->mtu_selector = IB_SA_EQ; 1041 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1042 alt_path->rate_selector = IB_SA_EQ; 1043 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1044 alt_path->packet_life_time_selector = IB_SA_EQ; 1045 alt_path->packet_life_time = 1046 cm_req_get_alt_local_ack_timeout(req_msg); 1047 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1048 } 1049} 1050 1051static void cm_format_req_event(struct cm_work *work, 1052 struct cm_id_private *cm_id_priv, 1053 struct ib_cm_id *listen_id) 1054{ 1055 struct cm_req_msg *req_msg; 1056 struct ib_cm_req_event_param *param; 1057 1058 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1059 param = &work->cm_event.param.req_rcvd; 1060 param->listen_id = listen_id; 1061 param->port = cm_id_priv->av.port->port_num; 1062 param->primary_path = &work->path[0]; 1063 if (req_msg->alt_local_lid) 1064 param->alternate_path = &work->path[1]; 1065 else 1066 param->alternate_path = NULL; 1067 param->remote_ca_guid = req_msg->local_ca_guid; 1068 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1069 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1070 param->qp_type = cm_req_get_qp_type(req_msg); 1071 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1072 param->responder_resources = cm_req_get_init_depth(req_msg); 1073 param->initiator_depth = cm_req_get_resp_res(req_msg); 1074 param->local_cm_response_timeout = 1075 cm_req_get_remote_resp_timeout(req_msg); 1076 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1077 param->remote_cm_response_timeout = 1078 cm_req_get_local_resp_timeout(req_msg); 1079 param->retry_count = cm_req_get_retry_count(req_msg); 1080 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1081 param->srq = cm_req_get_srq(req_msg); 1082 work->cm_event.private_data = &req_msg->private_data; 1083} 1084 1085static void cm_process_work(struct cm_id_private *cm_id_priv, 1086 struct cm_work *work) 1087{ 1088 unsigned long flags; 1089 int ret; 1090 1091 /* We will typically only have the current event to report. */ 1092 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1093 cm_free_work(work); 1094 1095 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1096 spin_lock_irqsave(&cm_id_priv->lock, flags); 1097 work = cm_dequeue_work(cm_id_priv); 1098 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1099 BUG_ON(!work); 1100 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1101 &work->cm_event); 1102 cm_free_work(work); 1103 } 1104 cm_deref_id(cm_id_priv); 1105 if (ret) 1106 ib_destroy_cm_id(&cm_id_priv->id); 1107} 1108 1109static void cm_format_mra(struct cm_mra_msg *mra_msg, 1110 struct cm_id_private *cm_id_priv, 1111 enum cm_msg_response msg_mraed, u8 service_timeout, 1112 const void *private_data, u8 private_data_len) 1113{ 1114 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1115 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1116 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1117 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1118 cm_mra_set_service_timeout(mra_msg, service_timeout); 1119 1120 if (private_data && private_data_len) 1121 memcpy(mra_msg->private_data, private_data, private_data_len); 1122} 1123 1124static void cm_format_rej(struct cm_rej_msg *rej_msg, 1125 struct cm_id_private *cm_id_priv, 1126 enum ib_cm_rej_reason reason, 1127 void *ari, 1128 u8 ari_length, 1129 const void *private_data, 1130 u8 private_data_len) 1131{ 1132 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1133 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1134 1135 switch(cm_id_priv->id.state) { 1136 case IB_CM_REQ_RCVD: 1137 rej_msg->local_comm_id = 0; 1138 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1139 break; 1140 case IB_CM_MRA_REQ_SENT: 1141 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1142 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1143 break; 1144 case IB_CM_REP_RCVD: 1145 case IB_CM_MRA_REP_SENT: 1146 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1147 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1148 break; 1149 default: 1150 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1151 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1152 break; 1153 } 1154 1155 rej_msg->reason = cpu_to_be16(reason); 1156 if (ari && ari_length) { 1157 cm_rej_set_reject_info_len(rej_msg, ari_length); 1158 memcpy(rej_msg->ari, ari, ari_length); 1159 } 1160 1161 if (private_data && private_data_len) 1162 memcpy(rej_msg->private_data, private_data, private_data_len); 1163} 1164 1165static void cm_dup_req_handler(struct cm_work *work, 1166 struct cm_id_private *cm_id_priv) 1167{ 1168 struct ib_mad_send_buf *msg = NULL; 1169 unsigned long flags; 1170 int ret; 1171 1172 /* Quick state check to discard duplicate REQs. */ 1173 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1174 return; 1175 1176 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1177 if (ret) 1178 return; 1179 1180 spin_lock_irqsave(&cm_id_priv->lock, flags); 1181 switch (cm_id_priv->id.state) { 1182 case IB_CM_MRA_REQ_SENT: 1183 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1184 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1185 cm_id_priv->private_data, 1186 cm_id_priv->private_data_len); 1187 break; 1188 case IB_CM_TIMEWAIT: 1189 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1190 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1191 break; 1192 default: 1193 goto unlock; 1194 } 1195 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1196 1197 ret = ib_post_send_mad(msg, NULL); 1198 if (ret) 1199 goto free; 1200 return; 1201 1202unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1203free: cm_free_msg(msg); 1204} 1205 1206static struct cm_id_private * cm_match_req(struct cm_work *work, 1207 struct cm_id_private *cm_id_priv) 1208{ 1209 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1210 struct cm_timewait_info *timewait_info; 1211 struct cm_req_msg *req_msg; 1212 unsigned long flags; 1213 1214 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1215 1216 /* Check for duplicate REQ and stale connections. */ 1217 spin_lock_irqsave(&cm.lock, flags); 1218 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1219 if (!timewait_info) 1220 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1221 1222 if (timewait_info) { 1223 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1224 timewait_info->work.remote_id); 1225 spin_unlock_irqrestore(&cm.lock, flags); 1226 if (cur_cm_id_priv) { 1227 cm_dup_req_handler(work, cur_cm_id_priv); 1228 cm_deref_id(cur_cm_id_priv); 1229 } else 1230 cm_issue_rej(work->port, work->mad_recv_wc, 1231 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1232 NULL, 0); 1233 goto error; 1234 } 1235 1236 /* Find matching listen request. */ 1237 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1238 req_msg->service_id); 1239 if (!listen_cm_id_priv) { 1240 spin_unlock_irqrestore(&cm.lock, flags); 1241 cm_issue_rej(work->port, work->mad_recv_wc, 1242 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1243 NULL, 0); 1244 goto error; 1245 } 1246 atomic_inc(&listen_cm_id_priv->refcount); 1247 atomic_inc(&cm_id_priv->refcount); 1248 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1249 atomic_inc(&cm_id_priv->work_count); 1250 spin_unlock_irqrestore(&cm.lock, flags); 1251 return listen_cm_id_priv; 1252 1253error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1254 return NULL; 1255} 1256 1257static int cm_req_handler(struct cm_work *work) 1258{ 1259 struct ib_cm_id *cm_id; 1260 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1261 struct cm_req_msg *req_msg; 1262 int ret; 1263 1264 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1265 1266 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1267 if (IS_ERR(cm_id)) 1268 return PTR_ERR(cm_id); 1269 1270 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1271 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1272 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1273 &cm_id_priv->av); 1274 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1275 id.local_id); 1276 if (IS_ERR(cm_id_priv->timewait_info)) { 1277 ret = PTR_ERR(cm_id_priv->timewait_info); 1278 goto error1; 1279 } 1280 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1281 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1282 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1283 1284 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1285 if (!listen_cm_id_priv) { 1286 ret = -EINVAL; 1287 goto error2; 1288 } 1289 1290 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1291 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1292 cm_id_priv->id.service_id = req_msg->service_id; 1293 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1294 1295 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1296 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1297 if (ret) 1298 goto error3; 1299 if (req_msg->alt_local_lid) { 1300 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1301 if (ret) 1302 goto error3; 1303 } 1304 cm_id_priv->tid = req_msg->hdr.tid; 1305 cm_id_priv->timeout_ms = cm_convert_to_ms( 1306 cm_req_get_local_resp_timeout(req_msg)); 1307 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1308 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1309 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1310 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1311 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1312 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1313 cm_id_priv->local_ack_timeout = 1314 cm_req_get_primary_local_ack_timeout(req_msg); 1315 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1316 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1317 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1318 1319 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1320 cm_process_work(cm_id_priv, work); 1321 cm_deref_id(listen_cm_id_priv); 1322 return 0; 1323 1324error3: atomic_dec(&cm_id_priv->refcount); 1325 cm_deref_id(listen_cm_id_priv); 1326 cm_cleanup_timewait(cm_id_priv->timewait_info); 1327error2: kfree(cm_id_priv->timewait_info); 1328 cm_id_priv->timewait_info = NULL; 1329error1: ib_destroy_cm_id(&cm_id_priv->id); 1330 return ret; 1331} 1332 1333static void cm_format_rep(struct cm_rep_msg *rep_msg, 1334 struct cm_id_private *cm_id_priv, 1335 struct ib_cm_rep_param *param) 1336{ 1337 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1338 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1339 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1340 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1341 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1342 rep_msg->resp_resources = param->responder_resources; 1343 rep_msg->initiator_depth = param->initiator_depth; 1344 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay); 1345 cm_rep_set_failover(rep_msg, param->failover_accepted); 1346 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1347 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1348 cm_rep_set_srq(rep_msg, param->srq); 1349 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 1350 1351 if (param->private_data && param->private_data_len) 1352 memcpy(rep_msg->private_data, param->private_data, 1353 param->private_data_len); 1354} 1355 1356int ib_send_cm_rep(struct ib_cm_id *cm_id, 1357 struct ib_cm_rep_param *param) 1358{ 1359 struct cm_id_private *cm_id_priv; 1360 struct ib_mad_send_buf *msg; 1361 struct cm_rep_msg *rep_msg; 1362 unsigned long flags; 1363 int ret; 1364 1365 if (param->private_data && 1366 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1367 return -EINVAL; 1368 1369 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1370 spin_lock_irqsave(&cm_id_priv->lock, flags); 1371 if (cm_id->state != IB_CM_REQ_RCVD && 1372 cm_id->state != IB_CM_MRA_REQ_SENT) { 1373 ret = -EINVAL; 1374 goto out; 1375 } 1376 1377 ret = cm_alloc_msg(cm_id_priv, &msg); 1378 if (ret) 1379 goto out; 1380 1381 rep_msg = (struct cm_rep_msg *) msg->mad; 1382 cm_format_rep(rep_msg, cm_id_priv, param); 1383 msg->timeout_ms = cm_id_priv->timeout_ms; 1384 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1385 1386 ret = ib_post_send_mad(msg, NULL); 1387 if (ret) { 1388 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1389 cm_free_msg(msg); 1390 return ret; 1391 } 1392 1393 cm_id->state = IB_CM_REP_SENT; 1394 cm_id_priv->msg = msg; 1395 cm_id_priv->initiator_depth = param->initiator_depth; 1396 cm_id_priv->responder_resources = param->responder_resources; 1397 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1398 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1399 1400out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1401 return ret; 1402} 1403EXPORT_SYMBOL(ib_send_cm_rep); 1404 1405static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1406 struct cm_id_private *cm_id_priv, 1407 const void *private_data, 1408 u8 private_data_len) 1409{ 1410 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1411 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1412 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1413 1414 if (private_data && private_data_len) 1415 memcpy(rtu_msg->private_data, private_data, private_data_len); 1416} 1417 1418int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1419 const void *private_data, 1420 u8 private_data_len) 1421{ 1422 struct cm_id_private *cm_id_priv; 1423 struct ib_mad_send_buf *msg; 1424 unsigned long flags; 1425 void *data; 1426 int ret; 1427 1428 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1429 return -EINVAL; 1430 1431 data = cm_copy_private_data(private_data, private_data_len); 1432 if (IS_ERR(data)) 1433 return PTR_ERR(data); 1434 1435 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1436 spin_lock_irqsave(&cm_id_priv->lock, flags); 1437 if (cm_id->state != IB_CM_REP_RCVD && 1438 cm_id->state != IB_CM_MRA_REP_SENT) { 1439 ret = -EINVAL; 1440 goto error; 1441 } 1442 1443 ret = cm_alloc_msg(cm_id_priv, &msg); 1444 if (ret) 1445 goto error; 1446 1447 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1448 private_data, private_data_len); 1449 1450 ret = ib_post_send_mad(msg, NULL); 1451 if (ret) { 1452 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1453 cm_free_msg(msg); 1454 kfree(data); 1455 return ret; 1456 } 1457 1458 cm_id->state = IB_CM_ESTABLISHED; 1459 cm_set_private_data(cm_id_priv, data, private_data_len); 1460 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1461 return 0; 1462 1463error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1464 kfree(data); 1465 return ret; 1466} 1467EXPORT_SYMBOL(ib_send_cm_rtu); 1468 1469static void cm_format_rep_event(struct cm_work *work) 1470{ 1471 struct cm_rep_msg *rep_msg; 1472 struct ib_cm_rep_event_param *param; 1473 1474 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1475 param = &work->cm_event.param.rep_rcvd; 1476 param->remote_ca_guid = rep_msg->local_ca_guid; 1477 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1478 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1479 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1480 param->responder_resources = rep_msg->initiator_depth; 1481 param->initiator_depth = rep_msg->resp_resources; 1482 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1483 param->failover_accepted = cm_rep_get_failover(rep_msg); 1484 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1485 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1486 param->srq = cm_rep_get_srq(rep_msg); 1487 work->cm_event.private_data = &rep_msg->private_data; 1488} 1489 1490static void cm_dup_rep_handler(struct cm_work *work) 1491{ 1492 struct cm_id_private *cm_id_priv; 1493 struct cm_rep_msg *rep_msg; 1494 struct ib_mad_send_buf *msg = NULL; 1495 unsigned long flags; 1496 int ret; 1497 1498 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1499 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1500 rep_msg->local_comm_id); 1501 if (!cm_id_priv) 1502 return; 1503 1504 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1505 if (ret) 1506 goto deref; 1507 1508 spin_lock_irqsave(&cm_id_priv->lock, flags); 1509 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1510 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1511 cm_id_priv->private_data, 1512 cm_id_priv->private_data_len); 1513 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1514 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1515 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1516 cm_id_priv->private_data, 1517 cm_id_priv->private_data_len); 1518 else 1519 goto unlock; 1520 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1521 1522 ret = ib_post_send_mad(msg, NULL); 1523 if (ret) 1524 goto free; 1525 goto deref; 1526 1527unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1528free: cm_free_msg(msg); 1529deref: cm_deref_id(cm_id_priv); 1530} 1531 1532static int cm_rep_handler(struct cm_work *work) 1533{ 1534 struct cm_id_private *cm_id_priv; 1535 struct cm_rep_msg *rep_msg; 1536 unsigned long flags; 1537 int ret; 1538 1539 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1540 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1541 if (!cm_id_priv) { 1542 cm_dup_rep_handler(work); 1543 return -EINVAL; 1544 } 1545 1546 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1547 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1548 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1549 1550 spin_lock_irqsave(&cm.lock, flags); 1551 /* Check for duplicate REP. */ 1552 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1553 spin_unlock_irqrestore(&cm.lock, flags); 1554 ret = -EINVAL; 1555 goto error; 1556 } 1557 /* Check for a stale connection. */ 1558 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1559 spin_unlock_irqrestore(&cm.lock, flags); 1560 cm_issue_rej(work->port, work->mad_recv_wc, 1561 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1562 NULL, 0); 1563 ret = -EINVAL; 1564 goto error; 1565 } 1566 spin_unlock_irqrestore(&cm.lock, flags); 1567 1568 cm_format_rep_event(work); 1569 1570 spin_lock_irqsave(&cm_id_priv->lock, flags); 1571 switch (cm_id_priv->id.state) { 1572 case IB_CM_REQ_SENT: 1573 case IB_CM_MRA_REQ_RCVD: 1574 break; 1575 default: 1576 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1577 ret = -EINVAL; 1578 goto error; 1579 } 1580 cm_id_priv->id.state = IB_CM_REP_RCVD; 1581 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1582 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1583 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1584 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1585 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1586 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1587 1588 /* todo: handle peer_to_peer */ 1589 1590 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1591 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1592 if (!ret) 1593 list_add_tail(&work->list, &cm_id_priv->work_list); 1594 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1595 1596 if (ret) 1597 cm_process_work(cm_id_priv, work); 1598 else 1599 cm_deref_id(cm_id_priv); 1600 return 0; 1601 1602error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1603 cm_deref_id(cm_id_priv); 1604 return ret; 1605} 1606 1607static int cm_establish_handler(struct cm_work *work) 1608{ 1609 struct cm_id_private *cm_id_priv; 1610 unsigned long flags; 1611 int ret; 1612 1613 /* See comment in ib_cm_establish about lookup. */ 1614 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1615 if (!cm_id_priv) 1616 return -EINVAL; 1617 1618 spin_lock_irqsave(&cm_id_priv->lock, flags); 1619 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1620 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1621 goto out; 1622 } 1623 1624 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1625 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1626 if (!ret) 1627 list_add_tail(&work->list, &cm_id_priv->work_list); 1628 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1629 1630 if (ret) 1631 cm_process_work(cm_id_priv, work); 1632 else 1633 cm_deref_id(cm_id_priv); 1634 return 0; 1635out: 1636 cm_deref_id(cm_id_priv); 1637 return -EINVAL; 1638} 1639 1640static int cm_rtu_handler(struct cm_work *work) 1641{ 1642 struct cm_id_private *cm_id_priv; 1643 struct cm_rtu_msg *rtu_msg; 1644 unsigned long flags; 1645 int ret; 1646 1647 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1648 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1649 rtu_msg->local_comm_id); 1650 if (!cm_id_priv) 1651 return -EINVAL; 1652 1653 work->cm_event.private_data = &rtu_msg->private_data; 1654 1655 spin_lock_irqsave(&cm_id_priv->lock, flags); 1656 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1657 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1658 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1659 goto out; 1660 } 1661 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1662 1663 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1664 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1665 if (!ret) 1666 list_add_tail(&work->list, &cm_id_priv->work_list); 1667 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1668 1669 if (ret) 1670 cm_process_work(cm_id_priv, work); 1671 else 1672 cm_deref_id(cm_id_priv); 1673 return 0; 1674out: 1675 cm_deref_id(cm_id_priv); 1676 return -EINVAL; 1677} 1678 1679static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1680 struct cm_id_private *cm_id_priv, 1681 const void *private_data, 1682 u8 private_data_len) 1683{ 1684 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1685 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1686 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1687 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1688 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1689 1690 if (private_data && private_data_len) 1691 memcpy(dreq_msg->private_data, private_data, private_data_len); 1692} 1693 1694int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1695 const void *private_data, 1696 u8 private_data_len) 1697{ 1698 struct cm_id_private *cm_id_priv; 1699 struct ib_mad_send_buf *msg; 1700 unsigned long flags; 1701 int ret; 1702 1703 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1704 return -EINVAL; 1705 1706 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1707 spin_lock_irqsave(&cm_id_priv->lock, flags); 1708 if (cm_id->state != IB_CM_ESTABLISHED) { 1709 ret = -EINVAL; 1710 goto out; 1711 } 1712 1713 ret = cm_alloc_msg(cm_id_priv, &msg); 1714 if (ret) { 1715 cm_enter_timewait(cm_id_priv); 1716 goto out; 1717 } 1718 1719 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1720 private_data, private_data_len); 1721 msg->timeout_ms = cm_id_priv->timeout_ms; 1722 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1723 1724 ret = ib_post_send_mad(msg, NULL); 1725 if (ret) { 1726 cm_enter_timewait(cm_id_priv); 1727 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1728 cm_free_msg(msg); 1729 return ret; 1730 } 1731 1732 cm_id->state = IB_CM_DREQ_SENT; 1733 cm_id_priv->msg = msg; 1734out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1735 return ret; 1736} 1737EXPORT_SYMBOL(ib_send_cm_dreq); 1738 1739static void cm_format_drep(struct cm_drep_msg *drep_msg, 1740 struct cm_id_private *cm_id_priv, 1741 const void *private_data, 1742 u8 private_data_len) 1743{ 1744 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1745 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1746 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1747 1748 if (private_data && private_data_len) 1749 memcpy(drep_msg->private_data, private_data, private_data_len); 1750} 1751 1752int ib_send_cm_drep(struct ib_cm_id *cm_id, 1753 const void *private_data, 1754 u8 private_data_len) 1755{ 1756 struct cm_id_private *cm_id_priv; 1757 struct ib_mad_send_buf *msg; 1758 unsigned long flags; 1759 void *data; 1760 int ret; 1761 1762 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1763 return -EINVAL; 1764 1765 data = cm_copy_private_data(private_data, private_data_len); 1766 if (IS_ERR(data)) 1767 return PTR_ERR(data); 1768 1769 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1770 spin_lock_irqsave(&cm_id_priv->lock, flags); 1771 if (cm_id->state != IB_CM_DREQ_RCVD) { 1772 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1773 kfree(data); 1774 return -EINVAL; 1775 } 1776 1777 cm_set_private_data(cm_id_priv, data, private_data_len); 1778 cm_enter_timewait(cm_id_priv); 1779 1780 ret = cm_alloc_msg(cm_id_priv, &msg); 1781 if (ret) 1782 goto out; 1783 1784 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1785 private_data, private_data_len); 1786 1787 ret = ib_post_send_mad(msg, NULL); 1788 if (ret) { 1789 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1790 cm_free_msg(msg); 1791 return ret; 1792 } 1793 1794out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1795 return ret; 1796} 1797EXPORT_SYMBOL(ib_send_cm_drep); 1798 1799static int cm_dreq_handler(struct cm_work *work) 1800{ 1801 struct cm_id_private *cm_id_priv; 1802 struct cm_dreq_msg *dreq_msg; 1803 struct ib_mad_send_buf *msg = NULL; 1804 unsigned long flags; 1805 int ret; 1806 1807 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1808 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1809 dreq_msg->local_comm_id); 1810 if (!cm_id_priv) 1811 return -EINVAL; 1812 1813 work->cm_event.private_data = &dreq_msg->private_data; 1814 1815 spin_lock_irqsave(&cm_id_priv->lock, flags); 1816 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1817 goto unlock; 1818 1819 switch (cm_id_priv->id.state) { 1820 case IB_CM_REP_SENT: 1821 case IB_CM_DREQ_SENT: 1822 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1823 break; 1824 case IB_CM_ESTABLISHED: 1825 case IB_CM_MRA_REP_RCVD: 1826 break; 1827 case IB_CM_TIMEWAIT: 1828 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1829 goto unlock; 1830 1831 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1832 cm_id_priv->private_data, 1833 cm_id_priv->private_data_len); 1834 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1835 1836 if (ib_post_send_mad(msg, NULL)) 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, cm_id_priv->msg); 1884 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1885 if (!ret) 1886 list_add_tail(&work->list, &cm_id_priv->work_list); 1887 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1888 1889 if (ret) 1890 cm_process_work(cm_id_priv, work); 1891 else 1892 cm_deref_id(cm_id_priv); 1893 return 0; 1894out: 1895 cm_deref_id(cm_id_priv); 1896 return -EINVAL; 1897} 1898 1899int ib_send_cm_rej(struct ib_cm_id *cm_id, 1900 enum ib_cm_rej_reason reason, 1901 void *ari, 1902 u8 ari_length, 1903 const void *private_data, 1904 u8 private_data_len) 1905{ 1906 struct cm_id_private *cm_id_priv; 1907 struct ib_mad_send_buf *msg; 1908 unsigned long flags; 1909 int ret; 1910 1911 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 1912 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 1913 return -EINVAL; 1914 1915 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1916 1917 spin_lock_irqsave(&cm_id_priv->lock, flags); 1918 switch (cm_id->state) { 1919 case IB_CM_REQ_SENT: 1920 case IB_CM_MRA_REQ_RCVD: 1921 case IB_CM_REQ_RCVD: 1922 case IB_CM_MRA_REQ_SENT: 1923 case IB_CM_REP_RCVD: 1924 case IB_CM_MRA_REP_SENT: 1925 ret = cm_alloc_msg(cm_id_priv, &msg); 1926 if (!ret) 1927 cm_format_rej((struct cm_rej_msg *) msg->mad, 1928 cm_id_priv, reason, ari, ari_length, 1929 private_data, private_data_len); 1930 1931 cm_reset_to_idle(cm_id_priv); 1932 break; 1933 case IB_CM_REP_SENT: 1934 case IB_CM_MRA_REP_RCVD: 1935 ret = cm_alloc_msg(cm_id_priv, &msg); 1936 if (!ret) 1937 cm_format_rej((struct cm_rej_msg *) msg->mad, 1938 cm_id_priv, reason, ari, ari_length, 1939 private_data, private_data_len); 1940 1941 cm_enter_timewait(cm_id_priv); 1942 break; 1943 default: 1944 ret = -EINVAL; 1945 goto out; 1946 } 1947 1948 if (ret) 1949 goto out; 1950 1951 ret = ib_post_send_mad(msg, NULL); 1952 if (ret) 1953 cm_free_msg(msg); 1954 1955out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1956 return ret; 1957} 1958EXPORT_SYMBOL(ib_send_cm_rej); 1959 1960static void cm_format_rej_event(struct cm_work *work) 1961{ 1962 struct cm_rej_msg *rej_msg; 1963 struct ib_cm_rej_event_param *param; 1964 1965 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 1966 param = &work->cm_event.param.rej_rcvd; 1967 param->ari = rej_msg->ari; 1968 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 1969 param->reason = __be16_to_cpu(rej_msg->reason); 1970 work->cm_event.private_data = &rej_msg->private_data; 1971} 1972 1973static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 1974{ 1975 struct cm_timewait_info *timewait_info; 1976 struct cm_id_private *cm_id_priv; 1977 unsigned long flags; 1978 __be32 remote_id; 1979 1980 remote_id = rej_msg->local_comm_id; 1981 1982 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 1983 spin_lock_irqsave(&cm.lock, flags); 1984 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 1985 remote_id); 1986 if (!timewait_info) { 1987 spin_unlock_irqrestore(&cm.lock, flags); 1988 return NULL; 1989 } 1990 cm_id_priv = idr_find(&cm.local_id_table, 1991 (__force int) timewait_info->work.local_id); 1992 if (cm_id_priv) { 1993 if (cm_id_priv->id.remote_id == remote_id) 1994 atomic_inc(&cm_id_priv->refcount); 1995 else 1996 cm_id_priv = NULL; 1997 } 1998 spin_unlock_irqrestore(&cm.lock, flags); 1999 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2000 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2001 else 2002 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2003 2004 return cm_id_priv; 2005} 2006 2007static int cm_rej_handler(struct cm_work *work) 2008{ 2009 struct cm_id_private *cm_id_priv; 2010 struct cm_rej_msg *rej_msg; 2011 unsigned long flags; 2012 int ret; 2013 2014 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2015 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2016 if (!cm_id_priv) 2017 return -EINVAL; 2018 2019 cm_format_rej_event(work); 2020 2021 spin_lock_irqsave(&cm_id_priv->lock, flags); 2022 switch (cm_id_priv->id.state) { 2023 case IB_CM_REQ_SENT: 2024 case IB_CM_MRA_REQ_RCVD: 2025 case IB_CM_REP_SENT: 2026 case IB_CM_MRA_REP_RCVD: 2027 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2028 /* fall through */ 2029 case IB_CM_REQ_RCVD: 2030 case IB_CM_MRA_REQ_SENT: 2031 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2032 cm_enter_timewait(cm_id_priv); 2033 else 2034 cm_reset_to_idle(cm_id_priv); 2035 break; 2036 case IB_CM_DREQ_SENT: 2037 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2038 /* fall through */ 2039 case IB_CM_REP_RCVD: 2040 case IB_CM_MRA_REP_SENT: 2041 case IB_CM_ESTABLISHED: 2042 cm_enter_timewait(cm_id_priv); 2043 break; 2044 default: 2045 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2046 ret = -EINVAL; 2047 goto out; 2048 } 2049 2050 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2051 if (!ret) 2052 list_add_tail(&work->list, &cm_id_priv->work_list); 2053 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2054 2055 if (ret) 2056 cm_process_work(cm_id_priv, work); 2057 else 2058 cm_deref_id(cm_id_priv); 2059 return 0; 2060out: 2061 cm_deref_id(cm_id_priv); 2062 return -EINVAL; 2063} 2064 2065int ib_send_cm_mra(struct ib_cm_id *cm_id, 2066 u8 service_timeout, 2067 const void *private_data, 2068 u8 private_data_len) 2069{ 2070 struct cm_id_private *cm_id_priv; 2071 struct ib_mad_send_buf *msg; 2072 void *data; 2073 unsigned long flags; 2074 int ret; 2075 2076 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2077 return -EINVAL; 2078 2079 data = cm_copy_private_data(private_data, private_data_len); 2080 if (IS_ERR(data)) 2081 return PTR_ERR(data); 2082 2083 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2084 2085 spin_lock_irqsave(&cm_id_priv->lock, flags); 2086 switch(cm_id_priv->id.state) { 2087 case IB_CM_REQ_RCVD: 2088 ret = cm_alloc_msg(cm_id_priv, &msg); 2089 if (ret) 2090 goto error1; 2091 2092 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2093 CM_MSG_RESPONSE_REQ, service_timeout, 2094 private_data, private_data_len); 2095 ret = ib_post_send_mad(msg, NULL); 2096 if (ret) 2097 goto error2; 2098 cm_id->state = IB_CM_MRA_REQ_SENT; 2099 break; 2100 case IB_CM_REP_RCVD: 2101 ret = cm_alloc_msg(cm_id_priv, &msg); 2102 if (ret) 2103 goto error1; 2104 2105 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2106 CM_MSG_RESPONSE_REP, service_timeout, 2107 private_data, private_data_len); 2108 ret = ib_post_send_mad(msg, NULL); 2109 if (ret) 2110 goto error2; 2111 cm_id->state = IB_CM_MRA_REP_SENT; 2112 break; 2113 case IB_CM_ESTABLISHED: 2114 ret = cm_alloc_msg(cm_id_priv, &msg); 2115 if (ret) 2116 goto error1; 2117 2118 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2119 CM_MSG_RESPONSE_OTHER, service_timeout, 2120 private_data, private_data_len); 2121 ret = ib_post_send_mad(msg, NULL); 2122 if (ret) 2123 goto error2; 2124 cm_id->lap_state = IB_CM_MRA_LAP_SENT; 2125 break; 2126 default: 2127 ret = -EINVAL; 2128 goto error1; 2129 } 2130 cm_id_priv->service_timeout = service_timeout; 2131 cm_set_private_data(cm_id_priv, data, private_data_len); 2132 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2133 return 0; 2134 2135error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2136 kfree(data); 2137 return ret; 2138 2139error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2140 kfree(data); 2141 cm_free_msg(msg); 2142 return ret; 2143} 2144EXPORT_SYMBOL(ib_send_cm_mra); 2145 2146static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2147{ 2148 switch (cm_mra_get_msg_mraed(mra_msg)) { 2149 case CM_MSG_RESPONSE_REQ: 2150 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2151 case CM_MSG_RESPONSE_REP: 2152 case CM_MSG_RESPONSE_OTHER: 2153 return cm_acquire_id(mra_msg->remote_comm_id, 2154 mra_msg->local_comm_id); 2155 default: 2156 return NULL; 2157 } 2158} 2159 2160static int cm_mra_handler(struct cm_work *work) 2161{ 2162 struct cm_id_private *cm_id_priv; 2163 struct cm_mra_msg *mra_msg; 2164 unsigned long flags; 2165 int timeout, ret; 2166 2167 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2168 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2169 if (!cm_id_priv) 2170 return -EINVAL; 2171 2172 work->cm_event.private_data = &mra_msg->private_data; 2173 work->cm_event.param.mra_rcvd.service_timeout = 2174 cm_mra_get_service_timeout(mra_msg); 2175 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2176 cm_convert_to_ms(cm_id_priv->av.packet_life_time); 2177 2178 spin_lock_irqsave(&cm_id_priv->lock, flags); 2179 switch (cm_id_priv->id.state) { 2180 case IB_CM_REQ_SENT: 2181 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2182 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2183 cm_id_priv->msg, timeout)) 2184 goto out; 2185 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2186 break; 2187 case IB_CM_REP_SENT: 2188 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2189 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2190 cm_id_priv->msg, timeout)) 2191 goto out; 2192 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2193 break; 2194 case IB_CM_ESTABLISHED: 2195 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2196 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2197 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2198 cm_id_priv->msg, timeout)) 2199 goto out; 2200 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2201 break; 2202 default: 2203 goto out; 2204 } 2205 2206 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2207 cm_id_priv->id.state; 2208 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2209 if (!ret) 2210 list_add_tail(&work->list, &cm_id_priv->work_list); 2211 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2212 2213 if (ret) 2214 cm_process_work(cm_id_priv, work); 2215 else 2216 cm_deref_id(cm_id_priv); 2217 return 0; 2218out: 2219 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2220 cm_deref_id(cm_id_priv); 2221 return -EINVAL; 2222} 2223 2224static void cm_format_lap(struct cm_lap_msg *lap_msg, 2225 struct cm_id_private *cm_id_priv, 2226 struct ib_sa_path_rec *alternate_path, 2227 const void *private_data, 2228 u8 private_data_len) 2229{ 2230 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2231 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2232 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2233 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2234 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2235 /* todo: need remote CM response timeout */ 2236 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2237 lap_msg->alt_local_lid = alternate_path->slid; 2238 lap_msg->alt_remote_lid = alternate_path->dlid; 2239 lap_msg->alt_local_gid = alternate_path->sgid; 2240 lap_msg->alt_remote_gid = alternate_path->dgid; 2241 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2242 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2243 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2244 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2245 cm_lap_set_sl(lap_msg, alternate_path->sl); 2246 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2247 cm_lap_set_local_ack_timeout(lap_msg, 2248 min(31, alternate_path->packet_life_time + 1)); 2249 2250 if (private_data && private_data_len) 2251 memcpy(lap_msg->private_data, private_data, private_data_len); 2252} 2253 2254int ib_send_cm_lap(struct ib_cm_id *cm_id, 2255 struct ib_sa_path_rec *alternate_path, 2256 const void *private_data, 2257 u8 private_data_len) 2258{ 2259 struct cm_id_private *cm_id_priv; 2260 struct ib_mad_send_buf *msg; 2261 unsigned long flags; 2262 int ret; 2263 2264 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2265 return -EINVAL; 2266 2267 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2268 spin_lock_irqsave(&cm_id_priv->lock, flags); 2269 if (cm_id->state != IB_CM_ESTABLISHED || 2270 cm_id->lap_state != IB_CM_LAP_IDLE) { 2271 ret = -EINVAL; 2272 goto out; 2273 } 2274 2275 ret = cm_alloc_msg(cm_id_priv, &msg); 2276 if (ret) 2277 goto out; 2278 2279 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2280 alternate_path, private_data, private_data_len); 2281 msg->timeout_ms = cm_id_priv->timeout_ms; 2282 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2283 2284 ret = ib_post_send_mad(msg, NULL); 2285 if (ret) { 2286 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2287 cm_free_msg(msg); 2288 return ret; 2289 } 2290 2291 cm_id->lap_state = IB_CM_LAP_SENT; 2292 cm_id_priv->msg = msg; 2293 2294out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2295 return ret; 2296} 2297EXPORT_SYMBOL(ib_send_cm_lap); 2298 2299static void cm_format_path_from_lap(struct ib_sa_path_rec *path, 2300 struct cm_lap_msg *lap_msg) 2301{ 2302 memset(path, 0, sizeof *path); 2303 path->dgid = lap_msg->alt_local_gid; 2304 path->sgid = lap_msg->alt_remote_gid; 2305 path->dlid = lap_msg->alt_local_lid; 2306 path->slid = lap_msg->alt_remote_lid; 2307 path->flow_label = cm_lap_get_flow_label(lap_msg); 2308 path->hop_limit = lap_msg->alt_hop_limit; 2309 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2310 path->reversible = 1; 2311 /* pkey is same as in REQ */ 2312 path->sl = cm_lap_get_sl(lap_msg); 2313 path->mtu_selector = IB_SA_EQ; 2314 /* mtu is same as in REQ */ 2315 path->rate_selector = IB_SA_EQ; 2316 path->rate = cm_lap_get_packet_rate(lap_msg); 2317 path->packet_life_time_selector = IB_SA_EQ; 2318 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2319 path->packet_life_time -= (path->packet_life_time > 0); 2320} 2321 2322static int cm_lap_handler(struct cm_work *work) 2323{ 2324 struct cm_id_private *cm_id_priv; 2325 struct cm_lap_msg *lap_msg; 2326 struct ib_cm_lap_event_param *param; 2327 struct ib_mad_send_buf *msg = NULL; 2328 unsigned long flags; 2329 int ret; 2330 2331 /* todo: verify LAP request and send reject APR if invalid. */ 2332 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2333 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2334 lap_msg->local_comm_id); 2335 if (!cm_id_priv) 2336 return -EINVAL; 2337 2338 param = &work->cm_event.param.lap_rcvd; 2339 param->alternate_path = &work->path[0]; 2340 cm_format_path_from_lap(param->alternate_path, lap_msg); 2341 work->cm_event.private_data = &lap_msg->private_data; 2342 2343 spin_lock_irqsave(&cm_id_priv->lock, flags); 2344 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2345 goto unlock; 2346 2347 switch (cm_id_priv->id.lap_state) { 2348 case IB_CM_LAP_IDLE: 2349 break; 2350 case IB_CM_MRA_LAP_SENT: 2351 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2352 goto unlock; 2353 2354 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2355 CM_MSG_RESPONSE_OTHER, 2356 cm_id_priv->service_timeout, 2357 cm_id_priv->private_data, 2358 cm_id_priv->private_data_len); 2359 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2360 2361 if (ib_post_send_mad(msg, NULL)) 2362 cm_free_msg(msg); 2363 goto deref; 2364 default: 2365 goto unlock; 2366 } 2367 2368 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2369 cm_id_priv->tid = lap_msg->hdr.tid; 2370 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2371 if (!ret) 2372 list_add_tail(&work->list, &cm_id_priv->work_list); 2373 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2374 2375 if (ret) 2376 cm_process_work(cm_id_priv, work); 2377 else 2378 cm_deref_id(cm_id_priv); 2379 return 0; 2380 2381unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2382deref: cm_deref_id(cm_id_priv); 2383 return -EINVAL; 2384} 2385 2386static void cm_format_apr(struct cm_apr_msg *apr_msg, 2387 struct cm_id_private *cm_id_priv, 2388 enum ib_cm_apr_status status, 2389 void *info, 2390 u8 info_length, 2391 const void *private_data, 2392 u8 private_data_len) 2393{ 2394 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2395 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2396 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2397 apr_msg->ap_status = (u8) status; 2398 2399 if (info && info_length) { 2400 apr_msg->info_length = info_length; 2401 memcpy(apr_msg->info, info, info_length); 2402 } 2403 2404 if (private_data && private_data_len) 2405 memcpy(apr_msg->private_data, private_data, private_data_len); 2406} 2407 2408int ib_send_cm_apr(struct ib_cm_id *cm_id, 2409 enum ib_cm_apr_status status, 2410 void *info, 2411 u8 info_length, 2412 const void *private_data, 2413 u8 private_data_len) 2414{ 2415 struct cm_id_private *cm_id_priv; 2416 struct ib_mad_send_buf *msg; 2417 unsigned long flags; 2418 int ret; 2419 2420 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2421 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2422 return -EINVAL; 2423 2424 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2425 spin_lock_irqsave(&cm_id_priv->lock, flags); 2426 if (cm_id->state != IB_CM_ESTABLISHED || 2427 (cm_id->lap_state != IB_CM_LAP_RCVD && 2428 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2429 ret = -EINVAL; 2430 goto out; 2431 } 2432 2433 ret = cm_alloc_msg(cm_id_priv, &msg); 2434 if (ret) 2435 goto out; 2436 2437 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2438 info, info_length, private_data, private_data_len); 2439 ret = ib_post_send_mad(msg, NULL); 2440 if (ret) { 2441 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2442 cm_free_msg(msg); 2443 return ret; 2444 } 2445 2446 cm_id->lap_state = IB_CM_LAP_IDLE; 2447out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2448 return ret; 2449} 2450EXPORT_SYMBOL(ib_send_cm_apr); 2451 2452static int cm_apr_handler(struct cm_work *work) 2453{ 2454 struct cm_id_private *cm_id_priv; 2455 struct cm_apr_msg *apr_msg; 2456 unsigned long flags; 2457 int ret; 2458 2459 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2460 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2461 apr_msg->local_comm_id); 2462 if (!cm_id_priv) 2463 return -EINVAL; /* Unmatched reply. */ 2464 2465 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2466 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2467 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2468 work->cm_event.private_data = &apr_msg->private_data; 2469 2470 spin_lock_irqsave(&cm_id_priv->lock, flags); 2471 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2472 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2473 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2474 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2475 goto out; 2476 } 2477 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2478 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2479 cm_id_priv->msg = NULL; 2480 2481 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2482 if (!ret) 2483 list_add_tail(&work->list, &cm_id_priv->work_list); 2484 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2485 2486 if (ret) 2487 cm_process_work(cm_id_priv, work); 2488 else 2489 cm_deref_id(cm_id_priv); 2490 return 0; 2491out: 2492 cm_deref_id(cm_id_priv); 2493 return -EINVAL; 2494} 2495 2496static int cm_timewait_handler(struct cm_work *work) 2497{ 2498 struct cm_timewait_info *timewait_info; 2499 struct cm_id_private *cm_id_priv; 2500 unsigned long flags; 2501 int ret; 2502 2503 timewait_info = (struct cm_timewait_info *)work; 2504 cm_cleanup_timewait(timewait_info); 2505 2506 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2507 timewait_info->work.remote_id); 2508 if (!cm_id_priv) 2509 return -EINVAL; 2510 2511 spin_lock_irqsave(&cm_id_priv->lock, flags); 2512 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2513 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2514 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2515 goto out; 2516 } 2517 cm_id_priv->id.state = IB_CM_IDLE; 2518 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2519 if (!ret) 2520 list_add_tail(&work->list, &cm_id_priv->work_list); 2521 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2522 2523 if (ret) 2524 cm_process_work(cm_id_priv, work); 2525 else 2526 cm_deref_id(cm_id_priv); 2527 return 0; 2528out: 2529 cm_deref_id(cm_id_priv); 2530 return -EINVAL; 2531} 2532 2533static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2534 struct cm_id_private *cm_id_priv, 2535 struct ib_cm_sidr_req_param *param) 2536{ 2537 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2538 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2539 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2540 sidr_req_msg->pkey = cpu_to_be16(param->pkey); 2541 sidr_req_msg->service_id = param->service_id; 2542 2543 if (param->private_data && param->private_data_len) 2544 memcpy(sidr_req_msg->private_data, param->private_data, 2545 param->private_data_len); 2546} 2547 2548int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2549 struct ib_cm_sidr_req_param *param) 2550{ 2551 struct cm_id_private *cm_id_priv; 2552 struct ib_mad_send_buf *msg; 2553 unsigned long flags; 2554 int ret; 2555 2556 if (!param->path || (param->private_data && 2557 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2558 return -EINVAL; 2559 2560 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2561 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2562 if (ret) 2563 goto out; 2564 2565 cm_id->service_id = param->service_id; 2566 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2567 cm_id_priv->timeout_ms = param->timeout_ms; 2568 cm_id_priv->max_cm_retries = param->max_cm_retries; 2569 ret = cm_alloc_msg(cm_id_priv, &msg); 2570 if (ret) 2571 goto out; 2572 2573 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2574 param); 2575 msg->timeout_ms = cm_id_priv->timeout_ms; 2576 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2577 2578 spin_lock_irqsave(&cm_id_priv->lock, flags); 2579 if (cm_id->state == IB_CM_IDLE) 2580 ret = ib_post_send_mad(msg, NULL); 2581 else 2582 ret = -EINVAL; 2583 2584 if (ret) { 2585 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2586 cm_free_msg(msg); 2587 goto out; 2588 } 2589 cm_id->state = IB_CM_SIDR_REQ_SENT; 2590 cm_id_priv->msg = msg; 2591 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2592out: 2593 return ret; 2594} 2595EXPORT_SYMBOL(ib_send_cm_sidr_req); 2596 2597static void cm_format_sidr_req_event(struct cm_work *work, 2598 struct ib_cm_id *listen_id) 2599{ 2600 struct cm_sidr_req_msg *sidr_req_msg; 2601 struct ib_cm_sidr_req_event_param *param; 2602 2603 sidr_req_msg = (struct cm_sidr_req_msg *) 2604 work->mad_recv_wc->recv_buf.mad; 2605 param = &work->cm_event.param.sidr_req_rcvd; 2606 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2607 param->listen_id = listen_id; 2608 param->port = work->port->port_num; 2609 work->cm_event.private_data = &sidr_req_msg->private_data; 2610} 2611 2612static int cm_sidr_req_handler(struct cm_work *work) 2613{ 2614 struct ib_cm_id *cm_id; 2615 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2616 struct cm_sidr_req_msg *sidr_req_msg; 2617 struct ib_wc *wc; 2618 unsigned long flags; 2619 2620 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2621 if (IS_ERR(cm_id)) 2622 return PTR_ERR(cm_id); 2623 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2624 2625 /* Record SGID/SLID and request ID for lookup. */ 2626 sidr_req_msg = (struct cm_sidr_req_msg *) 2627 work->mad_recv_wc->recv_buf.mad; 2628 wc = work->mad_recv_wc->wc; 2629 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2630 cm_id_priv->av.dgid.global.interface_id = 0; 2631 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2632 &cm_id_priv->av); 2633 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2634 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2635 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2636 atomic_inc(&cm_id_priv->work_count); 2637 2638 spin_lock_irqsave(&cm.lock, flags); 2639 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2640 if (cur_cm_id_priv) { 2641 spin_unlock_irqrestore(&cm.lock, flags); 2642 goto out; /* Duplicate message. */ 2643 } 2644 cur_cm_id_priv = cm_find_listen(cm_id->device, 2645 sidr_req_msg->service_id); 2646 if (!cur_cm_id_priv) { 2647 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2648 spin_unlock_irqrestore(&cm.lock, flags); 2649 /* todo: reply with no match */ 2650 goto out; /* No match. */ 2651 } 2652 atomic_inc(&cur_cm_id_priv->refcount); 2653 spin_unlock_irqrestore(&cm.lock, flags); 2654 2655 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2656 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2657 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2658 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2659 2660 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2661 cm_process_work(cm_id_priv, work); 2662 cm_deref_id(cur_cm_id_priv); 2663 return 0; 2664out: 2665 ib_destroy_cm_id(&cm_id_priv->id); 2666 return -EINVAL; 2667} 2668 2669static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2670 struct cm_id_private *cm_id_priv, 2671 struct ib_cm_sidr_rep_param *param) 2672{ 2673 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2674 cm_id_priv->tid); 2675 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2676 sidr_rep_msg->status = param->status; 2677 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2678 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2679 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2680 2681 if (param->info && param->info_length) 2682 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2683 2684 if (param->private_data && param->private_data_len) 2685 memcpy(sidr_rep_msg->private_data, param->private_data, 2686 param->private_data_len); 2687} 2688 2689int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2690 struct ib_cm_sidr_rep_param *param) 2691{ 2692 struct cm_id_private *cm_id_priv; 2693 struct ib_mad_send_buf *msg; 2694 unsigned long flags; 2695 int ret; 2696 2697 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2698 (param->private_data && 2699 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2700 return -EINVAL; 2701 2702 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2703 spin_lock_irqsave(&cm_id_priv->lock, flags); 2704 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2705 ret = -EINVAL; 2706 goto error; 2707 } 2708 2709 ret = cm_alloc_msg(cm_id_priv, &msg); 2710 if (ret) 2711 goto error; 2712 2713 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2714 param); 2715 ret = ib_post_send_mad(msg, NULL); 2716 if (ret) { 2717 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2718 cm_free_msg(msg); 2719 return ret; 2720 } 2721 cm_id->state = IB_CM_IDLE; 2722 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2723 2724 spin_lock_irqsave(&cm.lock, flags); 2725 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2726 spin_unlock_irqrestore(&cm.lock, flags); 2727 return 0; 2728 2729error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2730 return ret; 2731} 2732EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2733 2734static void cm_format_sidr_rep_event(struct cm_work *work) 2735{ 2736 struct cm_sidr_rep_msg *sidr_rep_msg; 2737 struct ib_cm_sidr_rep_event_param *param; 2738 2739 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2740 work->mad_recv_wc->recv_buf.mad; 2741 param = &work->cm_event.param.sidr_rep_rcvd; 2742 param->status = sidr_rep_msg->status; 2743 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2744 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2745 param->info = &sidr_rep_msg->info; 2746 param->info_len = sidr_rep_msg->info_length; 2747 work->cm_event.private_data = &sidr_rep_msg->private_data; 2748} 2749 2750static int cm_sidr_rep_handler(struct cm_work *work) 2751{ 2752 struct cm_sidr_rep_msg *sidr_rep_msg; 2753 struct cm_id_private *cm_id_priv; 2754 unsigned long flags; 2755 2756 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2757 work->mad_recv_wc->recv_buf.mad; 2758 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2759 if (!cm_id_priv) 2760 return -EINVAL; /* Unmatched reply. */ 2761 2762 spin_lock_irqsave(&cm_id_priv->lock, flags); 2763 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2764 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2765 goto out; 2766 } 2767 cm_id_priv->id.state = IB_CM_IDLE; 2768 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2769 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2770 2771 cm_format_sidr_rep_event(work); 2772 cm_process_work(cm_id_priv, work); 2773 return 0; 2774out: 2775 cm_deref_id(cm_id_priv); 2776 return -EINVAL; 2777} 2778 2779static void cm_process_send_error(struct ib_mad_send_buf *msg, 2780 enum ib_wc_status wc_status) 2781{ 2782 struct cm_id_private *cm_id_priv; 2783 struct ib_cm_event cm_event; 2784 enum ib_cm_state state; 2785 unsigned long flags; 2786 int ret; 2787 2788 memset(&cm_event, 0, sizeof cm_event); 2789 cm_id_priv = msg->context[0]; 2790 2791 /* Discard old sends or ones without a response. */ 2792 spin_lock_irqsave(&cm_id_priv->lock, flags); 2793 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2794 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2795 goto discard; 2796 2797 switch (state) { 2798 case IB_CM_REQ_SENT: 2799 case IB_CM_MRA_REQ_RCVD: 2800 cm_reset_to_idle(cm_id_priv); 2801 cm_event.event = IB_CM_REQ_ERROR; 2802 break; 2803 case IB_CM_REP_SENT: 2804 case IB_CM_MRA_REP_RCVD: 2805 cm_reset_to_idle(cm_id_priv); 2806 cm_event.event = IB_CM_REP_ERROR; 2807 break; 2808 case IB_CM_DREQ_SENT: 2809 cm_enter_timewait(cm_id_priv); 2810 cm_event.event = IB_CM_DREQ_ERROR; 2811 break; 2812 case IB_CM_SIDR_REQ_SENT: 2813 cm_id_priv->id.state = IB_CM_IDLE; 2814 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2815 break; 2816 default: 2817 goto discard; 2818 } 2819 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2820 cm_event.param.send_status = wc_status; 2821 2822 /* No other events can occur on the cm_id at this point. */ 2823 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2824 cm_free_msg(msg); 2825 if (ret) 2826 ib_destroy_cm_id(&cm_id_priv->id); 2827 return; 2828discard: 2829 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2830 cm_free_msg(msg); 2831} 2832 2833static void cm_send_handler(struct ib_mad_agent *mad_agent, 2834 struct ib_mad_send_wc *mad_send_wc) 2835{ 2836 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 2837 2838 switch (mad_send_wc->status) { 2839 case IB_WC_SUCCESS: 2840 case IB_WC_WR_FLUSH_ERR: 2841 cm_free_msg(msg); 2842 break; 2843 default: 2844 if (msg->context[0] && msg->context[1]) 2845 cm_process_send_error(msg, mad_send_wc->status); 2846 else 2847 cm_free_msg(msg); 2848 break; 2849 } 2850} 2851 2852static void cm_work_handler(void *data) 2853{ 2854 struct cm_work *work = data; 2855 int ret; 2856 2857 switch (work->cm_event.event) { 2858 case IB_CM_REQ_RECEIVED: 2859 ret = cm_req_handler(work); 2860 break; 2861 case IB_CM_MRA_RECEIVED: 2862 ret = cm_mra_handler(work); 2863 break; 2864 case IB_CM_REJ_RECEIVED: 2865 ret = cm_rej_handler(work); 2866 break; 2867 case IB_CM_REP_RECEIVED: 2868 ret = cm_rep_handler(work); 2869 break; 2870 case IB_CM_RTU_RECEIVED: 2871 ret = cm_rtu_handler(work); 2872 break; 2873 case IB_CM_USER_ESTABLISHED: 2874 ret = cm_establish_handler(work); 2875 break; 2876 case IB_CM_DREQ_RECEIVED: 2877 ret = cm_dreq_handler(work); 2878 break; 2879 case IB_CM_DREP_RECEIVED: 2880 ret = cm_drep_handler(work); 2881 break; 2882 case IB_CM_SIDR_REQ_RECEIVED: 2883 ret = cm_sidr_req_handler(work); 2884 break; 2885 case IB_CM_SIDR_REP_RECEIVED: 2886 ret = cm_sidr_rep_handler(work); 2887 break; 2888 case IB_CM_LAP_RECEIVED: 2889 ret = cm_lap_handler(work); 2890 break; 2891 case IB_CM_APR_RECEIVED: 2892 ret = cm_apr_handler(work); 2893 break; 2894 case IB_CM_TIMEWAIT_EXIT: 2895 ret = cm_timewait_handler(work); 2896 break; 2897 default: 2898 ret = -EINVAL; 2899 break; 2900 } 2901 if (ret) 2902 cm_free_work(work); 2903} 2904 2905int ib_cm_establish(struct ib_cm_id *cm_id) 2906{ 2907 struct cm_id_private *cm_id_priv; 2908 struct cm_work *work; 2909 unsigned long flags; 2910 int ret = 0; 2911 2912 work = kmalloc(sizeof *work, GFP_ATOMIC); 2913 if (!work) 2914 return -ENOMEM; 2915 2916 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2917 spin_lock_irqsave(&cm_id_priv->lock, flags); 2918 switch (cm_id->state) 2919 { 2920 case IB_CM_REP_SENT: 2921 case IB_CM_MRA_REP_RCVD: 2922 cm_id->state = IB_CM_ESTABLISHED; 2923 break; 2924 case IB_CM_ESTABLISHED: 2925 ret = -EISCONN; 2926 break; 2927 default: 2928 ret = -EINVAL; 2929 break; 2930 } 2931 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2932 2933 if (ret) { 2934 kfree(work); 2935 goto out; 2936 } 2937 2938 /* 2939 * The CM worker thread may try to destroy the cm_id before it 2940 * can execute this work item. To prevent potential deadlock, 2941 * we need to find the cm_id once we're in the context of the 2942 * worker thread, rather than holding a reference on it. 2943 */ 2944 INIT_WORK(&work->work, cm_work_handler, work); 2945 work->local_id = cm_id->local_id; 2946 work->remote_id = cm_id->remote_id; 2947 work->mad_recv_wc = NULL; 2948 work->cm_event.event = IB_CM_USER_ESTABLISHED; 2949 queue_work(cm.wq, &work->work); 2950out: 2951 return ret; 2952} 2953EXPORT_SYMBOL(ib_cm_establish); 2954 2955static void cm_recv_handler(struct ib_mad_agent *mad_agent, 2956 struct ib_mad_recv_wc *mad_recv_wc) 2957{ 2958 struct cm_work *work; 2959 enum ib_cm_event_type event; 2960 int paths = 0; 2961 2962 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 2963 case CM_REQ_ATTR_ID: 2964 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 2965 alt_local_lid != 0); 2966 event = IB_CM_REQ_RECEIVED; 2967 break; 2968 case CM_MRA_ATTR_ID: 2969 event = IB_CM_MRA_RECEIVED; 2970 break; 2971 case CM_REJ_ATTR_ID: 2972 event = IB_CM_REJ_RECEIVED; 2973 break; 2974 case CM_REP_ATTR_ID: 2975 event = IB_CM_REP_RECEIVED; 2976 break; 2977 case CM_RTU_ATTR_ID: 2978 event = IB_CM_RTU_RECEIVED; 2979 break; 2980 case CM_DREQ_ATTR_ID: 2981 event = IB_CM_DREQ_RECEIVED; 2982 break; 2983 case CM_DREP_ATTR_ID: 2984 event = IB_CM_DREP_RECEIVED; 2985 break; 2986 case CM_SIDR_REQ_ATTR_ID: 2987 event = IB_CM_SIDR_REQ_RECEIVED; 2988 break; 2989 case CM_SIDR_REP_ATTR_ID: 2990 event = IB_CM_SIDR_REP_RECEIVED; 2991 break; 2992 case CM_LAP_ATTR_ID: 2993 paths = 1; 2994 event = IB_CM_LAP_RECEIVED; 2995 break; 2996 case CM_APR_ATTR_ID: 2997 event = IB_CM_APR_RECEIVED; 2998 break; 2999 default: 3000 ib_free_recv_mad(mad_recv_wc); 3001 return; 3002 } 3003 3004 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3005 GFP_KERNEL); 3006 if (!work) { 3007 ib_free_recv_mad(mad_recv_wc); 3008 return; 3009 } 3010 3011 INIT_WORK(&work->work, cm_work_handler, work); 3012 work->cm_event.event = event; 3013 work->mad_recv_wc = mad_recv_wc; 3014 work->port = (struct cm_port *)mad_agent->context; 3015 queue_work(cm.wq, &work->work); 3016} 3017 3018static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3019 struct ib_qp_attr *qp_attr, 3020 int *qp_attr_mask) 3021{ 3022 unsigned long flags; 3023 int ret; 3024 3025 spin_lock_irqsave(&cm_id_priv->lock, flags); 3026 switch (cm_id_priv->id.state) { 3027 case IB_CM_REQ_SENT: 3028 case IB_CM_MRA_REQ_RCVD: 3029 case IB_CM_REQ_RCVD: 3030 case IB_CM_MRA_REQ_SENT: 3031 case IB_CM_REP_RCVD: 3032 case IB_CM_MRA_REP_SENT: 3033 case IB_CM_REP_SENT: 3034 case IB_CM_MRA_REP_RCVD: 3035 case IB_CM_ESTABLISHED: 3036 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3037 IB_QP_PKEY_INDEX | IB_QP_PORT; 3038 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | 3039 IB_ACCESS_REMOTE_WRITE; 3040 if (cm_id_priv->responder_resources) 3041 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ; 3042 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3043 qp_attr->port_num = cm_id_priv->av.port->port_num; 3044 ret = 0; 3045 break; 3046 default: 3047 ret = -EINVAL; 3048 break; 3049 } 3050 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3051 return ret; 3052} 3053 3054static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3055 struct ib_qp_attr *qp_attr, 3056 int *qp_attr_mask) 3057{ 3058 unsigned long flags; 3059 int ret; 3060 3061 spin_lock_irqsave(&cm_id_priv->lock, flags); 3062 switch (cm_id_priv->id.state) { 3063 case IB_CM_REQ_RCVD: 3064 case IB_CM_MRA_REQ_SENT: 3065 case IB_CM_REP_RCVD: 3066 case IB_CM_MRA_REP_SENT: 3067 case IB_CM_REP_SENT: 3068 case IB_CM_MRA_REP_RCVD: 3069 case IB_CM_ESTABLISHED: 3070 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3071 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3072 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3073 qp_attr->path_mtu = cm_id_priv->path_mtu; 3074 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3075 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3076 if (cm_id_priv->qp_type == IB_QPT_RC) { 3077 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3078 IB_QP_MIN_RNR_TIMER; 3079 qp_attr->max_dest_rd_atomic = 3080 cm_id_priv->responder_resources; 3081 qp_attr->min_rnr_timer = 0; 3082 } 3083 if (cm_id_priv->alt_av.ah_attr.dlid) { 3084 *qp_attr_mask |= IB_QP_ALT_PATH; 3085 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3086 } 3087 ret = 0; 3088 break; 3089 default: 3090 ret = -EINVAL; 3091 break; 3092 } 3093 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3094 return ret; 3095} 3096 3097static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3098 struct ib_qp_attr *qp_attr, 3099 int *qp_attr_mask) 3100{ 3101 unsigned long flags; 3102 int ret; 3103 3104 spin_lock_irqsave(&cm_id_priv->lock, flags); 3105 switch (cm_id_priv->id.state) { 3106 case IB_CM_REP_RCVD: 3107 case IB_CM_MRA_REP_SENT: 3108 case IB_CM_REP_SENT: 3109 case IB_CM_MRA_REP_RCVD: 3110 case IB_CM_ESTABLISHED: 3111 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3112 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3113 if (cm_id_priv->qp_type == IB_QPT_RC) { 3114 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3115 IB_QP_RNR_RETRY | 3116 IB_QP_MAX_QP_RD_ATOMIC; 3117 qp_attr->timeout = cm_id_priv->local_ack_timeout; 3118 qp_attr->retry_cnt = cm_id_priv->retry_count; 3119 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3120 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3121 } 3122 if (cm_id_priv->alt_av.ah_attr.dlid) { 3123 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3124 qp_attr->path_mig_state = IB_MIG_REARM; 3125 } 3126 ret = 0; 3127 break; 3128 default: 3129 ret = -EINVAL; 3130 break; 3131 } 3132 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3133 return ret; 3134} 3135 3136int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3137 struct ib_qp_attr *qp_attr, 3138 int *qp_attr_mask) 3139{ 3140 struct cm_id_private *cm_id_priv; 3141 int ret; 3142 3143 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3144 switch (qp_attr->qp_state) { 3145 case IB_QPS_INIT: 3146 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3147 break; 3148 case IB_QPS_RTR: 3149 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3150 break; 3151 case IB_QPS_RTS: 3152 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3153 break; 3154 default: 3155 ret = -EINVAL; 3156 break; 3157 } 3158 return ret; 3159} 3160EXPORT_SYMBOL(ib_cm_init_qp_attr); 3161 3162static __be64 cm_get_ca_guid(struct ib_device *device) 3163{ 3164 struct ib_device_attr *device_attr; 3165 __be64 guid; 3166 int ret; 3167 3168 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 3169 if (!device_attr) 3170 return 0; 3171 3172 ret = ib_query_device(device, device_attr); 3173 guid = ret ? 0 : device_attr->node_guid; 3174 kfree(device_attr); 3175 return guid; 3176} 3177 3178static void cm_add_one(struct ib_device *device) 3179{ 3180 struct cm_device *cm_dev; 3181 struct cm_port *port; 3182 struct ib_mad_reg_req reg_req = { 3183 .mgmt_class = IB_MGMT_CLASS_CM, 3184 .mgmt_class_version = IB_CM_CLASS_VERSION 3185 }; 3186 struct ib_port_modify port_modify = { 3187 .set_port_cap_mask = IB_PORT_CM_SUP 3188 }; 3189 unsigned long flags; 3190 int ret; 3191 u8 i; 3192 3193 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3194 device->phys_port_cnt, GFP_KERNEL); 3195 if (!cm_dev) 3196 return; 3197 3198 cm_dev->device = device; 3199 cm_dev->ca_guid = cm_get_ca_guid(device); 3200 if (!cm_dev->ca_guid) 3201 goto error1; 3202 3203 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3204 for (i = 1; i <= device->phys_port_cnt; i++) { 3205 port = &cm_dev->port[i-1]; 3206 port->cm_dev = cm_dev; 3207 port->port_num = i; 3208 port->mad_agent = ib_register_mad_agent(device, i, 3209 IB_QPT_GSI, 3210 ®_req, 3211 0, 3212 cm_send_handler, 3213 cm_recv_handler, 3214 port); 3215 if (IS_ERR(port->mad_agent)) 3216 goto error2; 3217 3218 ret = ib_modify_port(device, i, 0, &port_modify); 3219 if (ret) 3220 goto error3; 3221 } 3222 ib_set_client_data(device, &cm_client, cm_dev); 3223 3224 write_lock_irqsave(&cm.device_lock, flags); 3225 list_add_tail(&cm_dev->list, &cm.device_list); 3226 write_unlock_irqrestore(&cm.device_lock, flags); 3227 return; 3228 3229error3: 3230 ib_unregister_mad_agent(port->mad_agent); 3231error2: 3232 port_modify.set_port_cap_mask = 0; 3233 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3234 while (--i) { 3235 port = &cm_dev->port[i-1]; 3236 ib_modify_port(device, port->port_num, 0, &port_modify); 3237 ib_unregister_mad_agent(port->mad_agent); 3238 } 3239error1: 3240 kfree(cm_dev); 3241} 3242 3243static void cm_remove_one(struct ib_device *device) 3244{ 3245 struct cm_device *cm_dev; 3246 struct cm_port *port; 3247 struct ib_port_modify port_modify = { 3248 .clr_port_cap_mask = IB_PORT_CM_SUP 3249 }; 3250 unsigned long flags; 3251 int i; 3252 3253 cm_dev = ib_get_client_data(device, &cm_client); 3254 if (!cm_dev) 3255 return; 3256 3257 write_lock_irqsave(&cm.device_lock, flags); 3258 list_del(&cm_dev->list); 3259 write_unlock_irqrestore(&cm.device_lock, flags); 3260 3261 for (i = 1; i <= device->phys_port_cnt; i++) { 3262 port = &cm_dev->port[i-1]; 3263 ib_modify_port(device, port->port_num, 0, &port_modify); 3264 ib_unregister_mad_agent(port->mad_agent); 3265 } 3266 kfree(cm_dev); 3267} 3268 3269static int __init ib_cm_init(void) 3270{ 3271 int ret; 3272 3273 memset(&cm, 0, sizeof cm); 3274 INIT_LIST_HEAD(&cm.device_list); 3275 rwlock_init(&cm.device_lock); 3276 spin_lock_init(&cm.lock); 3277 cm.listen_service_table = RB_ROOT; 3278 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3279 cm.remote_id_table = RB_ROOT; 3280 cm.remote_qp_table = RB_ROOT; 3281 cm.remote_sidr_table = RB_ROOT; 3282 idr_init(&cm.local_id_table); 3283 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3284 3285 cm.wq = create_workqueue("ib_cm"); 3286 if (!cm.wq) 3287 return -ENOMEM; 3288 3289 ret = ib_register_client(&cm_client); 3290 if (ret) 3291 goto error; 3292 3293 return 0; 3294error: 3295 destroy_workqueue(cm.wq); 3296 return ret; 3297} 3298 3299static void __exit ib_cm_cleanup(void) 3300{ 3301 flush_workqueue(cm.wq); 3302 destroy_workqueue(cm.wq); 3303 ib_unregister_client(&cm_client); 3304 idr_destroy(&cm.local_id_table); 3305} 3306 3307module_init(ib_cm_init); 3308module_exit(ib_cm_cleanup); 3309 3310