cm.c revision de6eb66b56d9df5ce6bd254994f05e065214e8cd
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 = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 548 if (!cm_id_priv) 549 return ERR_PTR(-ENOMEM); 550 551 cm_id_priv->id.state = IB_CM_IDLE; 552 cm_id_priv->id.device = device; 553 cm_id_priv->id.cm_handler = cm_handler; 554 cm_id_priv->id.context = context; 555 cm_id_priv->id.remote_cm_qpn = 1; 556 ret = cm_alloc_id(cm_id_priv); 557 if (ret) 558 goto error; 559 560 spin_lock_init(&cm_id_priv->lock); 561 init_waitqueue_head(&cm_id_priv->wait); 562 INIT_LIST_HEAD(&cm_id_priv->work_list); 563 atomic_set(&cm_id_priv->work_count, -1); 564 atomic_set(&cm_id_priv->refcount, 1); 565 return &cm_id_priv->id; 566 567error: 568 kfree(cm_id_priv); 569 return ERR_PTR(-ENOMEM); 570} 571EXPORT_SYMBOL(ib_create_cm_id); 572 573static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 574{ 575 struct cm_work *work; 576 577 if (list_empty(&cm_id_priv->work_list)) 578 return NULL; 579 580 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 581 list_del(&work->list); 582 return work; 583} 584 585static void cm_free_work(struct cm_work *work) 586{ 587 if (work->mad_recv_wc) 588 ib_free_recv_mad(work->mad_recv_wc); 589 kfree(work); 590} 591 592static inline int cm_convert_to_ms(int iba_time) 593{ 594 /* approximate conversion to ms from 4.096us x 2^iba_time */ 595 return 1 << max(iba_time - 8, 0); 596} 597 598static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 599{ 600 unsigned long flags; 601 602 if (!timewait_info->inserted_remote_id && 603 !timewait_info->inserted_remote_qp) 604 return; 605 606 spin_lock_irqsave(&cm.lock, flags); 607 if (timewait_info->inserted_remote_id) { 608 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 609 timewait_info->inserted_remote_id = 0; 610 } 611 612 if (timewait_info->inserted_remote_qp) { 613 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 614 timewait_info->inserted_remote_qp = 0; 615 } 616 spin_unlock_irqrestore(&cm.lock, flags); 617} 618 619static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 620{ 621 struct cm_timewait_info *timewait_info; 622 623 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 624 if (!timewait_info) 625 return ERR_PTR(-ENOMEM); 626 627 timewait_info->work.local_id = local_id; 628 INIT_WORK(&timewait_info->work.work, cm_work_handler, 629 &timewait_info->work); 630 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 631 return timewait_info; 632} 633 634static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 635{ 636 int wait_time; 637 638 /* 639 * The cm_id could be destroyed by the user before we exit timewait. 640 * To protect against this, we search for the cm_id after exiting 641 * timewait before notifying the user that we've exited timewait. 642 */ 643 cm_id_priv->id.state = IB_CM_TIMEWAIT; 644 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout); 645 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 646 msecs_to_jiffies(wait_time)); 647 cm_id_priv->timewait_info = NULL; 648} 649 650static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 651{ 652 cm_id_priv->id.state = IB_CM_IDLE; 653 if (cm_id_priv->timewait_info) { 654 cm_cleanup_timewait(cm_id_priv->timewait_info); 655 kfree(cm_id_priv->timewait_info); 656 cm_id_priv->timewait_info = NULL; 657 } 658} 659 660void ib_destroy_cm_id(struct ib_cm_id *cm_id) 661{ 662 struct cm_id_private *cm_id_priv; 663 struct cm_work *work; 664 unsigned long flags; 665 666 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 667retest: 668 spin_lock_irqsave(&cm_id_priv->lock, flags); 669 switch (cm_id->state) { 670 case IB_CM_LISTEN: 671 cm_id->state = IB_CM_IDLE; 672 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 673 spin_lock_irqsave(&cm.lock, flags); 674 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 675 spin_unlock_irqrestore(&cm.lock, flags); 676 break; 677 case IB_CM_SIDR_REQ_SENT: 678 cm_id->state = IB_CM_IDLE; 679 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 680 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 681 break; 682 case IB_CM_SIDR_REQ_RCVD: 683 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 684 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 685 break; 686 case IB_CM_REQ_SENT: 687 case IB_CM_MRA_REQ_RCVD: 688 case IB_CM_REP_SENT: 689 case IB_CM_MRA_REP_RCVD: 690 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 691 /* Fall through */ 692 case IB_CM_REQ_RCVD: 693 case IB_CM_MRA_REQ_SENT: 694 case IB_CM_REP_RCVD: 695 case IB_CM_MRA_REP_SENT: 696 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 697 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 698 &cm_id_priv->av.port->cm_dev->ca_guid, 699 sizeof cm_id_priv->av.port->cm_dev->ca_guid, 700 NULL, 0); 701 break; 702 case IB_CM_ESTABLISHED: 703 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 704 ib_send_cm_dreq(cm_id, NULL, 0); 705 goto retest; 706 case IB_CM_DREQ_SENT: 707 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 708 cm_enter_timewait(cm_id_priv); 709 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 710 break; 711 case IB_CM_DREQ_RCVD: 712 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 713 ib_send_cm_drep(cm_id, NULL, 0); 714 break; 715 default: 716 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 717 break; 718 } 719 720 cm_free_id(cm_id->local_id); 721 atomic_dec(&cm_id_priv->refcount); 722 wait_event(cm_id_priv->wait, !atomic_read(&cm_id_priv->refcount)); 723 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 724 cm_free_work(work); 725 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 726 kfree(cm_id_priv->private_data); 727 kfree(cm_id_priv); 728} 729EXPORT_SYMBOL(ib_destroy_cm_id); 730 731int ib_cm_listen(struct ib_cm_id *cm_id, 732 __be64 service_id, 733 __be64 service_mask) 734{ 735 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 736 unsigned long flags; 737 int ret = 0; 738 739 service_mask = service_mask ? service_mask : 740 __constant_cpu_to_be64(~0ULL); 741 service_id &= service_mask; 742 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 743 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 744 return -EINVAL; 745 746 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 747 BUG_ON(cm_id->state != IB_CM_IDLE); 748 749 cm_id->state = IB_CM_LISTEN; 750 751 spin_lock_irqsave(&cm.lock, flags); 752 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 753 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 754 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 755 } else { 756 cm_id->service_id = service_id; 757 cm_id->service_mask = service_mask; 758 } 759 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 760 spin_unlock_irqrestore(&cm.lock, flags); 761 762 if (cur_cm_id_priv) { 763 cm_id->state = IB_CM_IDLE; 764 ret = -EBUSY; 765 } 766 return ret; 767} 768EXPORT_SYMBOL(ib_cm_listen); 769 770static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 771 enum cm_msg_sequence msg_seq) 772{ 773 u64 hi_tid, low_tid; 774 775 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 776 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 777 (msg_seq << 30)); 778 return cpu_to_be64(hi_tid | low_tid); 779} 780 781static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 782 __be16 attr_id, __be64 tid) 783{ 784 hdr->base_version = IB_MGMT_BASE_VERSION; 785 hdr->mgmt_class = IB_MGMT_CLASS_CM; 786 hdr->class_version = IB_CM_CLASS_VERSION; 787 hdr->method = IB_MGMT_METHOD_SEND; 788 hdr->attr_id = attr_id; 789 hdr->tid = tid; 790} 791 792static void cm_format_req(struct cm_req_msg *req_msg, 793 struct cm_id_private *cm_id_priv, 794 struct ib_cm_req_param *param) 795{ 796 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 797 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 798 799 req_msg->local_comm_id = cm_id_priv->id.local_id; 800 req_msg->service_id = param->service_id; 801 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 802 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 803 cm_req_set_resp_res(req_msg, param->responder_resources); 804 cm_req_set_init_depth(req_msg, param->initiator_depth); 805 cm_req_set_remote_resp_timeout(req_msg, 806 param->remote_cm_response_timeout); 807 cm_req_set_qp_type(req_msg, param->qp_type); 808 cm_req_set_flow_ctrl(req_msg, param->flow_control); 809 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 810 cm_req_set_local_resp_timeout(req_msg, 811 param->local_cm_response_timeout); 812 cm_req_set_retry_count(req_msg, param->retry_count); 813 req_msg->pkey = param->primary_path->pkey; 814 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 815 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 816 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 817 cm_req_set_srq(req_msg, param->srq); 818 819 req_msg->primary_local_lid = param->primary_path->slid; 820 req_msg->primary_remote_lid = param->primary_path->dlid; 821 req_msg->primary_local_gid = param->primary_path->sgid; 822 req_msg->primary_remote_gid = param->primary_path->dgid; 823 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 824 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 825 req_msg->primary_traffic_class = param->primary_path->traffic_class; 826 req_msg->primary_hop_limit = param->primary_path->hop_limit; 827 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 828 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 829 cm_req_set_primary_local_ack_timeout(req_msg, 830 min(31, param->primary_path->packet_life_time + 1)); 831 832 if (param->alternate_path) { 833 req_msg->alt_local_lid = param->alternate_path->slid; 834 req_msg->alt_remote_lid = param->alternate_path->dlid; 835 req_msg->alt_local_gid = param->alternate_path->sgid; 836 req_msg->alt_remote_gid = param->alternate_path->dgid; 837 cm_req_set_alt_flow_label(req_msg, 838 param->alternate_path->flow_label); 839 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 840 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 841 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 842 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 843 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 844 cm_req_set_alt_local_ack_timeout(req_msg, 845 min(31, param->alternate_path->packet_life_time + 1)); 846 } 847 848 if (param->private_data && param->private_data_len) 849 memcpy(req_msg->private_data, param->private_data, 850 param->private_data_len); 851} 852 853static inline int cm_validate_req_param(struct ib_cm_req_param *param) 854{ 855 /* peer-to-peer not supported */ 856 if (param->peer_to_peer) 857 return -EINVAL; 858 859 if (!param->primary_path) 860 return -EINVAL; 861 862 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 863 return -EINVAL; 864 865 if (param->private_data && 866 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 867 return -EINVAL; 868 869 if (param->alternate_path && 870 (param->alternate_path->pkey != param->primary_path->pkey || 871 param->alternate_path->mtu != param->primary_path->mtu)) 872 return -EINVAL; 873 874 return 0; 875} 876 877int ib_send_cm_req(struct ib_cm_id *cm_id, 878 struct ib_cm_req_param *param) 879{ 880 struct cm_id_private *cm_id_priv; 881 struct cm_req_msg *req_msg; 882 unsigned long flags; 883 int ret; 884 885 ret = cm_validate_req_param(param); 886 if (ret) 887 return ret; 888 889 /* Verify that we're not in timewait. */ 890 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 891 spin_lock_irqsave(&cm_id_priv->lock, flags); 892 if (cm_id->state != IB_CM_IDLE) { 893 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 894 ret = -EINVAL; 895 goto out; 896 } 897 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 898 899 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 900 id.local_id); 901 if (IS_ERR(cm_id_priv->timewait_info)) 902 goto out; 903 904 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 905 if (ret) 906 goto error1; 907 if (param->alternate_path) { 908 ret = cm_init_av_by_path(param->alternate_path, 909 &cm_id_priv->alt_av); 910 if (ret) 911 goto error1; 912 } 913 cm_id->service_id = param->service_id; 914 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 915 cm_id_priv->timeout_ms = cm_convert_to_ms( 916 param->primary_path->packet_life_time) * 2 + 917 cm_convert_to_ms( 918 param->remote_cm_response_timeout); 919 cm_id_priv->max_cm_retries = param->max_cm_retries; 920 cm_id_priv->initiator_depth = param->initiator_depth; 921 cm_id_priv->responder_resources = param->responder_resources; 922 cm_id_priv->retry_count = param->retry_count; 923 cm_id_priv->path_mtu = param->primary_path->mtu; 924 cm_id_priv->qp_type = param->qp_type; 925 926 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 927 if (ret) 928 goto error1; 929 930 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 931 cm_format_req(req_msg, cm_id_priv, param); 932 cm_id_priv->tid = req_msg->hdr.tid; 933 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 934 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 935 936 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 937 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 938 cm_id_priv->local_ack_timeout = 939 cm_req_get_primary_local_ack_timeout(req_msg); 940 941 spin_lock_irqsave(&cm_id_priv->lock, flags); 942 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 943 if (ret) { 944 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 945 goto error2; 946 } 947 BUG_ON(cm_id->state != IB_CM_IDLE); 948 cm_id->state = IB_CM_REQ_SENT; 949 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 950 return 0; 951 952error2: cm_free_msg(cm_id_priv->msg); 953error1: kfree(cm_id_priv->timewait_info); 954out: return ret; 955} 956EXPORT_SYMBOL(ib_send_cm_req); 957 958static int cm_issue_rej(struct cm_port *port, 959 struct ib_mad_recv_wc *mad_recv_wc, 960 enum ib_cm_rej_reason reason, 961 enum cm_msg_response msg_rejected, 962 void *ari, u8 ari_length) 963{ 964 struct ib_mad_send_buf *msg = NULL; 965 struct cm_rej_msg *rej_msg, *rcv_msg; 966 int ret; 967 968 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 969 if (ret) 970 return ret; 971 972 /* We just need common CM header information. Cast to any message. */ 973 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 974 rej_msg = (struct cm_rej_msg *) msg->mad; 975 976 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 977 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 978 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 979 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 980 rej_msg->reason = cpu_to_be16(reason); 981 982 if (ari && ari_length) { 983 cm_rej_set_reject_info_len(rej_msg, ari_length); 984 memcpy(rej_msg->ari, ari, ari_length); 985 } 986 987 ret = ib_post_send_mad(msg, NULL); 988 if (ret) 989 cm_free_msg(msg); 990 991 return ret; 992} 993 994static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 995 __be32 local_qpn, __be32 remote_qpn) 996{ 997 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 998 ((local_ca_guid == remote_ca_guid) && 999 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1000} 1001 1002static inline void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1003 struct ib_sa_path_rec *primary_path, 1004 struct ib_sa_path_rec *alt_path) 1005{ 1006 memset(primary_path, 0, sizeof *primary_path); 1007 primary_path->dgid = req_msg->primary_local_gid; 1008 primary_path->sgid = req_msg->primary_remote_gid; 1009 primary_path->dlid = req_msg->primary_local_lid; 1010 primary_path->slid = req_msg->primary_remote_lid; 1011 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1012 primary_path->hop_limit = req_msg->primary_hop_limit; 1013 primary_path->traffic_class = req_msg->primary_traffic_class; 1014 primary_path->reversible = 1; 1015 primary_path->pkey = req_msg->pkey; 1016 primary_path->sl = cm_req_get_primary_sl(req_msg); 1017 primary_path->mtu_selector = IB_SA_EQ; 1018 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1019 primary_path->rate_selector = IB_SA_EQ; 1020 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1021 primary_path->packet_life_time_selector = IB_SA_EQ; 1022 primary_path->packet_life_time = 1023 cm_req_get_primary_local_ack_timeout(req_msg); 1024 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1025 1026 if (req_msg->alt_local_lid) { 1027 memset(alt_path, 0, sizeof *alt_path); 1028 alt_path->dgid = req_msg->alt_local_gid; 1029 alt_path->sgid = req_msg->alt_remote_gid; 1030 alt_path->dlid = req_msg->alt_local_lid; 1031 alt_path->slid = req_msg->alt_remote_lid; 1032 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1033 alt_path->hop_limit = req_msg->alt_hop_limit; 1034 alt_path->traffic_class = req_msg->alt_traffic_class; 1035 alt_path->reversible = 1; 1036 alt_path->pkey = req_msg->pkey; 1037 alt_path->sl = cm_req_get_alt_sl(req_msg); 1038 alt_path->mtu_selector = IB_SA_EQ; 1039 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1040 alt_path->rate_selector = IB_SA_EQ; 1041 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1042 alt_path->packet_life_time_selector = IB_SA_EQ; 1043 alt_path->packet_life_time = 1044 cm_req_get_alt_local_ack_timeout(req_msg); 1045 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1046 } 1047} 1048 1049static void cm_format_req_event(struct cm_work *work, 1050 struct cm_id_private *cm_id_priv, 1051 struct ib_cm_id *listen_id) 1052{ 1053 struct cm_req_msg *req_msg; 1054 struct ib_cm_req_event_param *param; 1055 1056 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1057 param = &work->cm_event.param.req_rcvd; 1058 param->listen_id = listen_id; 1059 param->port = cm_id_priv->av.port->port_num; 1060 param->primary_path = &work->path[0]; 1061 if (req_msg->alt_local_lid) 1062 param->alternate_path = &work->path[1]; 1063 else 1064 param->alternate_path = NULL; 1065 param->remote_ca_guid = req_msg->local_ca_guid; 1066 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1067 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1068 param->qp_type = cm_req_get_qp_type(req_msg); 1069 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1070 param->responder_resources = cm_req_get_init_depth(req_msg); 1071 param->initiator_depth = cm_req_get_resp_res(req_msg); 1072 param->local_cm_response_timeout = 1073 cm_req_get_remote_resp_timeout(req_msg); 1074 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1075 param->remote_cm_response_timeout = 1076 cm_req_get_local_resp_timeout(req_msg); 1077 param->retry_count = cm_req_get_retry_count(req_msg); 1078 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1079 param->srq = cm_req_get_srq(req_msg); 1080 work->cm_event.private_data = &req_msg->private_data; 1081} 1082 1083static void cm_process_work(struct cm_id_private *cm_id_priv, 1084 struct cm_work *work) 1085{ 1086 unsigned long flags; 1087 int ret; 1088 1089 /* We will typically only have the current event to report. */ 1090 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1091 cm_free_work(work); 1092 1093 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1094 spin_lock_irqsave(&cm_id_priv->lock, flags); 1095 work = cm_dequeue_work(cm_id_priv); 1096 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1097 BUG_ON(!work); 1098 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1099 &work->cm_event); 1100 cm_free_work(work); 1101 } 1102 cm_deref_id(cm_id_priv); 1103 if (ret) 1104 ib_destroy_cm_id(&cm_id_priv->id); 1105} 1106 1107static void cm_format_mra(struct cm_mra_msg *mra_msg, 1108 struct cm_id_private *cm_id_priv, 1109 enum cm_msg_response msg_mraed, u8 service_timeout, 1110 const void *private_data, u8 private_data_len) 1111{ 1112 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1113 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1114 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1115 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1116 cm_mra_set_service_timeout(mra_msg, service_timeout); 1117 1118 if (private_data && private_data_len) 1119 memcpy(mra_msg->private_data, private_data, private_data_len); 1120} 1121 1122static void cm_format_rej(struct cm_rej_msg *rej_msg, 1123 struct cm_id_private *cm_id_priv, 1124 enum ib_cm_rej_reason reason, 1125 void *ari, 1126 u8 ari_length, 1127 const void *private_data, 1128 u8 private_data_len) 1129{ 1130 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1131 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1132 1133 switch(cm_id_priv->id.state) { 1134 case IB_CM_REQ_RCVD: 1135 rej_msg->local_comm_id = 0; 1136 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1137 break; 1138 case IB_CM_MRA_REQ_SENT: 1139 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1140 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1141 break; 1142 case IB_CM_REP_RCVD: 1143 case IB_CM_MRA_REP_SENT: 1144 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1145 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1146 break; 1147 default: 1148 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1149 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1150 break; 1151 } 1152 1153 rej_msg->reason = cpu_to_be16(reason); 1154 if (ari && ari_length) { 1155 cm_rej_set_reject_info_len(rej_msg, ari_length); 1156 memcpy(rej_msg->ari, ari, ari_length); 1157 } 1158 1159 if (private_data && private_data_len) 1160 memcpy(rej_msg->private_data, private_data, private_data_len); 1161} 1162 1163static void cm_dup_req_handler(struct cm_work *work, 1164 struct cm_id_private *cm_id_priv) 1165{ 1166 struct ib_mad_send_buf *msg = NULL; 1167 unsigned long flags; 1168 int ret; 1169 1170 /* Quick state check to discard duplicate REQs. */ 1171 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1172 return; 1173 1174 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1175 if (ret) 1176 return; 1177 1178 spin_lock_irqsave(&cm_id_priv->lock, flags); 1179 switch (cm_id_priv->id.state) { 1180 case IB_CM_MRA_REQ_SENT: 1181 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1182 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1183 cm_id_priv->private_data, 1184 cm_id_priv->private_data_len); 1185 break; 1186 case IB_CM_TIMEWAIT: 1187 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1188 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1189 break; 1190 default: 1191 goto unlock; 1192 } 1193 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1194 1195 ret = ib_post_send_mad(msg, NULL); 1196 if (ret) 1197 goto free; 1198 return; 1199 1200unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1201free: cm_free_msg(msg); 1202} 1203 1204static struct cm_id_private * cm_match_req(struct cm_work *work, 1205 struct cm_id_private *cm_id_priv) 1206{ 1207 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1208 struct cm_timewait_info *timewait_info; 1209 struct cm_req_msg *req_msg; 1210 unsigned long flags; 1211 1212 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1213 1214 /* Check for duplicate REQ and stale connections. */ 1215 spin_lock_irqsave(&cm.lock, flags); 1216 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1217 if (!timewait_info) 1218 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1219 1220 if (timewait_info) { 1221 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1222 timewait_info->work.remote_id); 1223 spin_unlock_irqrestore(&cm.lock, flags); 1224 if (cur_cm_id_priv) { 1225 cm_dup_req_handler(work, cur_cm_id_priv); 1226 cm_deref_id(cur_cm_id_priv); 1227 } else 1228 cm_issue_rej(work->port, work->mad_recv_wc, 1229 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1230 NULL, 0); 1231 goto error; 1232 } 1233 1234 /* Find matching listen request. */ 1235 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1236 req_msg->service_id); 1237 if (!listen_cm_id_priv) { 1238 spin_unlock_irqrestore(&cm.lock, flags); 1239 cm_issue_rej(work->port, work->mad_recv_wc, 1240 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1241 NULL, 0); 1242 goto error; 1243 } 1244 atomic_inc(&listen_cm_id_priv->refcount); 1245 atomic_inc(&cm_id_priv->refcount); 1246 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1247 atomic_inc(&cm_id_priv->work_count); 1248 spin_unlock_irqrestore(&cm.lock, flags); 1249 return listen_cm_id_priv; 1250 1251error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1252 return NULL; 1253} 1254 1255static int cm_req_handler(struct cm_work *work) 1256{ 1257 struct ib_cm_id *cm_id; 1258 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1259 struct cm_req_msg *req_msg; 1260 int ret; 1261 1262 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1263 1264 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1265 if (IS_ERR(cm_id)) 1266 return PTR_ERR(cm_id); 1267 1268 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1269 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1270 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1271 &cm_id_priv->av); 1272 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1273 id.local_id); 1274 if (IS_ERR(cm_id_priv->timewait_info)) { 1275 ret = PTR_ERR(cm_id_priv->timewait_info); 1276 goto error1; 1277 } 1278 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1279 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1280 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1281 1282 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1283 if (!listen_cm_id_priv) { 1284 ret = -EINVAL; 1285 goto error2; 1286 } 1287 1288 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1289 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1290 cm_id_priv->id.service_id = req_msg->service_id; 1291 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1292 1293 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1294 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1295 if (ret) 1296 goto error3; 1297 if (req_msg->alt_local_lid) { 1298 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1299 if (ret) 1300 goto error3; 1301 } 1302 cm_id_priv->tid = req_msg->hdr.tid; 1303 cm_id_priv->timeout_ms = cm_convert_to_ms( 1304 cm_req_get_local_resp_timeout(req_msg)); 1305 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1306 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1307 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1308 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1309 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1310 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1311 cm_id_priv->local_ack_timeout = 1312 cm_req_get_primary_local_ack_timeout(req_msg); 1313 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1314 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1315 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1316 1317 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1318 cm_process_work(cm_id_priv, work); 1319 cm_deref_id(listen_cm_id_priv); 1320 return 0; 1321 1322error3: atomic_dec(&cm_id_priv->refcount); 1323 cm_deref_id(listen_cm_id_priv); 1324 cm_cleanup_timewait(cm_id_priv->timewait_info); 1325error2: kfree(cm_id_priv->timewait_info); 1326 cm_id_priv->timewait_info = NULL; 1327error1: ib_destroy_cm_id(&cm_id_priv->id); 1328 return ret; 1329} 1330 1331static void cm_format_rep(struct cm_rep_msg *rep_msg, 1332 struct cm_id_private *cm_id_priv, 1333 struct ib_cm_rep_param *param) 1334{ 1335 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1336 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1337 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1338 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1339 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1340 rep_msg->resp_resources = param->responder_resources; 1341 rep_msg->initiator_depth = param->initiator_depth; 1342 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay); 1343 cm_rep_set_failover(rep_msg, param->failover_accepted); 1344 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1345 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1346 cm_rep_set_srq(rep_msg, param->srq); 1347 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 1348 1349 if (param->private_data && param->private_data_len) 1350 memcpy(rep_msg->private_data, param->private_data, 1351 param->private_data_len); 1352} 1353 1354int ib_send_cm_rep(struct ib_cm_id *cm_id, 1355 struct ib_cm_rep_param *param) 1356{ 1357 struct cm_id_private *cm_id_priv; 1358 struct ib_mad_send_buf *msg; 1359 struct cm_rep_msg *rep_msg; 1360 unsigned long flags; 1361 int ret; 1362 1363 if (param->private_data && 1364 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1365 return -EINVAL; 1366 1367 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1368 spin_lock_irqsave(&cm_id_priv->lock, flags); 1369 if (cm_id->state != IB_CM_REQ_RCVD && 1370 cm_id->state != IB_CM_MRA_REQ_SENT) { 1371 ret = -EINVAL; 1372 goto out; 1373 } 1374 1375 ret = cm_alloc_msg(cm_id_priv, &msg); 1376 if (ret) 1377 goto out; 1378 1379 rep_msg = (struct cm_rep_msg *) msg->mad; 1380 cm_format_rep(rep_msg, cm_id_priv, param); 1381 msg->timeout_ms = cm_id_priv->timeout_ms; 1382 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1383 1384 ret = ib_post_send_mad(msg, NULL); 1385 if (ret) { 1386 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1387 cm_free_msg(msg); 1388 return ret; 1389 } 1390 1391 cm_id->state = IB_CM_REP_SENT; 1392 cm_id_priv->msg = msg; 1393 cm_id_priv->initiator_depth = param->initiator_depth; 1394 cm_id_priv->responder_resources = param->responder_resources; 1395 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1396 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1397 1398out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1399 return ret; 1400} 1401EXPORT_SYMBOL(ib_send_cm_rep); 1402 1403static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1404 struct cm_id_private *cm_id_priv, 1405 const void *private_data, 1406 u8 private_data_len) 1407{ 1408 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1409 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1410 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1411 1412 if (private_data && private_data_len) 1413 memcpy(rtu_msg->private_data, private_data, private_data_len); 1414} 1415 1416int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1417 const void *private_data, 1418 u8 private_data_len) 1419{ 1420 struct cm_id_private *cm_id_priv; 1421 struct ib_mad_send_buf *msg; 1422 unsigned long flags; 1423 void *data; 1424 int ret; 1425 1426 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1427 return -EINVAL; 1428 1429 data = cm_copy_private_data(private_data, private_data_len); 1430 if (IS_ERR(data)) 1431 return PTR_ERR(data); 1432 1433 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1434 spin_lock_irqsave(&cm_id_priv->lock, flags); 1435 if (cm_id->state != IB_CM_REP_RCVD && 1436 cm_id->state != IB_CM_MRA_REP_SENT) { 1437 ret = -EINVAL; 1438 goto error; 1439 } 1440 1441 ret = cm_alloc_msg(cm_id_priv, &msg); 1442 if (ret) 1443 goto error; 1444 1445 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1446 private_data, private_data_len); 1447 1448 ret = ib_post_send_mad(msg, NULL); 1449 if (ret) { 1450 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1451 cm_free_msg(msg); 1452 kfree(data); 1453 return ret; 1454 } 1455 1456 cm_id->state = IB_CM_ESTABLISHED; 1457 cm_set_private_data(cm_id_priv, data, private_data_len); 1458 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1459 return 0; 1460 1461error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1462 kfree(data); 1463 return ret; 1464} 1465EXPORT_SYMBOL(ib_send_cm_rtu); 1466 1467static void cm_format_rep_event(struct cm_work *work) 1468{ 1469 struct cm_rep_msg *rep_msg; 1470 struct ib_cm_rep_event_param *param; 1471 1472 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1473 param = &work->cm_event.param.rep_rcvd; 1474 param->remote_ca_guid = rep_msg->local_ca_guid; 1475 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1476 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1477 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1478 param->responder_resources = rep_msg->initiator_depth; 1479 param->initiator_depth = rep_msg->resp_resources; 1480 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1481 param->failover_accepted = cm_rep_get_failover(rep_msg); 1482 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1483 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1484 param->srq = cm_rep_get_srq(rep_msg); 1485 work->cm_event.private_data = &rep_msg->private_data; 1486} 1487 1488static void cm_dup_rep_handler(struct cm_work *work) 1489{ 1490 struct cm_id_private *cm_id_priv; 1491 struct cm_rep_msg *rep_msg; 1492 struct ib_mad_send_buf *msg = NULL; 1493 unsigned long flags; 1494 int ret; 1495 1496 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1497 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1498 rep_msg->local_comm_id); 1499 if (!cm_id_priv) 1500 return; 1501 1502 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1503 if (ret) 1504 goto deref; 1505 1506 spin_lock_irqsave(&cm_id_priv->lock, flags); 1507 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1508 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1509 cm_id_priv->private_data, 1510 cm_id_priv->private_data_len); 1511 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1512 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1513 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1514 cm_id_priv->private_data, 1515 cm_id_priv->private_data_len); 1516 else 1517 goto unlock; 1518 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1519 1520 ret = ib_post_send_mad(msg, NULL); 1521 if (ret) 1522 goto free; 1523 goto deref; 1524 1525unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1526free: cm_free_msg(msg); 1527deref: cm_deref_id(cm_id_priv); 1528} 1529 1530static int cm_rep_handler(struct cm_work *work) 1531{ 1532 struct cm_id_private *cm_id_priv; 1533 struct cm_rep_msg *rep_msg; 1534 unsigned long flags; 1535 int ret; 1536 1537 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1538 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1539 if (!cm_id_priv) { 1540 cm_dup_rep_handler(work); 1541 return -EINVAL; 1542 } 1543 1544 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1545 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1546 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1547 1548 spin_lock_irqsave(&cm.lock, flags); 1549 /* Check for duplicate REP. */ 1550 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1551 spin_unlock_irqrestore(&cm.lock, flags); 1552 ret = -EINVAL; 1553 goto error; 1554 } 1555 /* Check for a stale connection. */ 1556 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1557 spin_unlock_irqrestore(&cm.lock, flags); 1558 cm_issue_rej(work->port, work->mad_recv_wc, 1559 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1560 NULL, 0); 1561 ret = -EINVAL; 1562 goto error; 1563 } 1564 spin_unlock_irqrestore(&cm.lock, flags); 1565 1566 cm_format_rep_event(work); 1567 1568 spin_lock_irqsave(&cm_id_priv->lock, flags); 1569 switch (cm_id_priv->id.state) { 1570 case IB_CM_REQ_SENT: 1571 case IB_CM_MRA_REQ_RCVD: 1572 break; 1573 default: 1574 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1575 ret = -EINVAL; 1576 goto error; 1577 } 1578 cm_id_priv->id.state = IB_CM_REP_RCVD; 1579 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1580 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1581 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1582 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1583 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1584 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1585 1586 /* todo: handle peer_to_peer */ 1587 1588 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1589 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1590 if (!ret) 1591 list_add_tail(&work->list, &cm_id_priv->work_list); 1592 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1593 1594 if (ret) 1595 cm_process_work(cm_id_priv, work); 1596 else 1597 cm_deref_id(cm_id_priv); 1598 return 0; 1599 1600error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1601 cm_deref_id(cm_id_priv); 1602 return ret; 1603} 1604 1605static int cm_establish_handler(struct cm_work *work) 1606{ 1607 struct cm_id_private *cm_id_priv; 1608 unsigned long flags; 1609 int ret; 1610 1611 /* See comment in ib_cm_establish about lookup. */ 1612 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1613 if (!cm_id_priv) 1614 return -EINVAL; 1615 1616 spin_lock_irqsave(&cm_id_priv->lock, flags); 1617 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1618 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1619 goto out; 1620 } 1621 1622 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1623 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1624 if (!ret) 1625 list_add_tail(&work->list, &cm_id_priv->work_list); 1626 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1627 1628 if (ret) 1629 cm_process_work(cm_id_priv, work); 1630 else 1631 cm_deref_id(cm_id_priv); 1632 return 0; 1633out: 1634 cm_deref_id(cm_id_priv); 1635 return -EINVAL; 1636} 1637 1638static int cm_rtu_handler(struct cm_work *work) 1639{ 1640 struct cm_id_private *cm_id_priv; 1641 struct cm_rtu_msg *rtu_msg; 1642 unsigned long flags; 1643 int ret; 1644 1645 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1646 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1647 rtu_msg->local_comm_id); 1648 if (!cm_id_priv) 1649 return -EINVAL; 1650 1651 work->cm_event.private_data = &rtu_msg->private_data; 1652 1653 spin_lock_irqsave(&cm_id_priv->lock, flags); 1654 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1655 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1656 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1657 goto out; 1658 } 1659 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1660 1661 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1662 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1663 if (!ret) 1664 list_add_tail(&work->list, &cm_id_priv->work_list); 1665 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1666 1667 if (ret) 1668 cm_process_work(cm_id_priv, work); 1669 else 1670 cm_deref_id(cm_id_priv); 1671 return 0; 1672out: 1673 cm_deref_id(cm_id_priv); 1674 return -EINVAL; 1675} 1676 1677static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1678 struct cm_id_private *cm_id_priv, 1679 const void *private_data, 1680 u8 private_data_len) 1681{ 1682 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1683 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1684 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1685 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1686 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1687 1688 if (private_data && private_data_len) 1689 memcpy(dreq_msg->private_data, private_data, private_data_len); 1690} 1691 1692int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1693 const void *private_data, 1694 u8 private_data_len) 1695{ 1696 struct cm_id_private *cm_id_priv; 1697 struct ib_mad_send_buf *msg; 1698 unsigned long flags; 1699 int ret; 1700 1701 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1702 return -EINVAL; 1703 1704 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1705 spin_lock_irqsave(&cm_id_priv->lock, flags); 1706 if (cm_id->state != IB_CM_ESTABLISHED) { 1707 ret = -EINVAL; 1708 goto out; 1709 } 1710 1711 ret = cm_alloc_msg(cm_id_priv, &msg); 1712 if (ret) { 1713 cm_enter_timewait(cm_id_priv); 1714 goto out; 1715 } 1716 1717 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1718 private_data, private_data_len); 1719 msg->timeout_ms = cm_id_priv->timeout_ms; 1720 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1721 1722 ret = ib_post_send_mad(msg, NULL); 1723 if (ret) { 1724 cm_enter_timewait(cm_id_priv); 1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1726 cm_free_msg(msg); 1727 return ret; 1728 } 1729 1730 cm_id->state = IB_CM_DREQ_SENT; 1731 cm_id_priv->msg = msg; 1732out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1733 return ret; 1734} 1735EXPORT_SYMBOL(ib_send_cm_dreq); 1736 1737static void cm_format_drep(struct cm_drep_msg *drep_msg, 1738 struct cm_id_private *cm_id_priv, 1739 const void *private_data, 1740 u8 private_data_len) 1741{ 1742 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1743 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1744 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1745 1746 if (private_data && private_data_len) 1747 memcpy(drep_msg->private_data, private_data, private_data_len); 1748} 1749 1750int ib_send_cm_drep(struct ib_cm_id *cm_id, 1751 const void *private_data, 1752 u8 private_data_len) 1753{ 1754 struct cm_id_private *cm_id_priv; 1755 struct ib_mad_send_buf *msg; 1756 unsigned long flags; 1757 void *data; 1758 int ret; 1759 1760 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1761 return -EINVAL; 1762 1763 data = cm_copy_private_data(private_data, private_data_len); 1764 if (IS_ERR(data)) 1765 return PTR_ERR(data); 1766 1767 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1768 spin_lock_irqsave(&cm_id_priv->lock, flags); 1769 if (cm_id->state != IB_CM_DREQ_RCVD) { 1770 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1771 kfree(data); 1772 return -EINVAL; 1773 } 1774 1775 cm_set_private_data(cm_id_priv, data, private_data_len); 1776 cm_enter_timewait(cm_id_priv); 1777 1778 ret = cm_alloc_msg(cm_id_priv, &msg); 1779 if (ret) 1780 goto out; 1781 1782 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1783 private_data, private_data_len); 1784 1785 ret = ib_post_send_mad(msg, NULL); 1786 if (ret) { 1787 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1788 cm_free_msg(msg); 1789 return ret; 1790 } 1791 1792out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1793 return ret; 1794} 1795EXPORT_SYMBOL(ib_send_cm_drep); 1796 1797static int cm_dreq_handler(struct cm_work *work) 1798{ 1799 struct cm_id_private *cm_id_priv; 1800 struct cm_dreq_msg *dreq_msg; 1801 struct ib_mad_send_buf *msg = NULL; 1802 unsigned long flags; 1803 int ret; 1804 1805 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1806 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1807 dreq_msg->local_comm_id); 1808 if (!cm_id_priv) 1809 return -EINVAL; 1810 1811 work->cm_event.private_data = &dreq_msg->private_data; 1812 1813 spin_lock_irqsave(&cm_id_priv->lock, flags); 1814 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1815 goto unlock; 1816 1817 switch (cm_id_priv->id.state) { 1818 case IB_CM_REP_SENT: 1819 case IB_CM_DREQ_SENT: 1820 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1821 break; 1822 case IB_CM_ESTABLISHED: 1823 case IB_CM_MRA_REP_RCVD: 1824 break; 1825 case IB_CM_TIMEWAIT: 1826 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1827 goto unlock; 1828 1829 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1830 cm_id_priv->private_data, 1831 cm_id_priv->private_data_len); 1832 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1833 1834 if (ib_post_send_mad(msg, NULL)) 1835 cm_free_msg(msg); 1836 goto deref; 1837 default: 1838 goto unlock; 1839 } 1840 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 1841 cm_id_priv->tid = dreq_msg->hdr.tid; 1842 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1843 if (!ret) 1844 list_add_tail(&work->list, &cm_id_priv->work_list); 1845 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1846 1847 if (ret) 1848 cm_process_work(cm_id_priv, work); 1849 else 1850 cm_deref_id(cm_id_priv); 1851 return 0; 1852 1853unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1854deref: cm_deref_id(cm_id_priv); 1855 return -EINVAL; 1856} 1857 1858static int cm_drep_handler(struct cm_work *work) 1859{ 1860 struct cm_id_private *cm_id_priv; 1861 struct cm_drep_msg *drep_msg; 1862 unsigned long flags; 1863 int ret; 1864 1865 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 1866 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 1867 drep_msg->local_comm_id); 1868 if (!cm_id_priv) 1869 return -EINVAL; 1870 1871 work->cm_event.private_data = &drep_msg->private_data; 1872 1873 spin_lock_irqsave(&cm_id_priv->lock, flags); 1874 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 1875 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 1876 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1877 goto out; 1878 } 1879 cm_enter_timewait(cm_id_priv); 1880 1881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1882 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1883 if (!ret) 1884 list_add_tail(&work->list, &cm_id_priv->work_list); 1885 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1886 1887 if (ret) 1888 cm_process_work(cm_id_priv, work); 1889 else 1890 cm_deref_id(cm_id_priv); 1891 return 0; 1892out: 1893 cm_deref_id(cm_id_priv); 1894 return -EINVAL; 1895} 1896 1897int ib_send_cm_rej(struct ib_cm_id *cm_id, 1898 enum ib_cm_rej_reason reason, 1899 void *ari, 1900 u8 ari_length, 1901 const void *private_data, 1902 u8 private_data_len) 1903{ 1904 struct cm_id_private *cm_id_priv; 1905 struct ib_mad_send_buf *msg; 1906 unsigned long flags; 1907 int ret; 1908 1909 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 1910 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 1911 return -EINVAL; 1912 1913 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1914 1915 spin_lock_irqsave(&cm_id_priv->lock, flags); 1916 switch (cm_id->state) { 1917 case IB_CM_REQ_SENT: 1918 case IB_CM_MRA_REQ_RCVD: 1919 case IB_CM_REQ_RCVD: 1920 case IB_CM_MRA_REQ_SENT: 1921 case IB_CM_REP_RCVD: 1922 case IB_CM_MRA_REP_SENT: 1923 ret = cm_alloc_msg(cm_id_priv, &msg); 1924 if (!ret) 1925 cm_format_rej((struct cm_rej_msg *) msg->mad, 1926 cm_id_priv, reason, ari, ari_length, 1927 private_data, private_data_len); 1928 1929 cm_reset_to_idle(cm_id_priv); 1930 break; 1931 case IB_CM_REP_SENT: 1932 case IB_CM_MRA_REP_RCVD: 1933 ret = cm_alloc_msg(cm_id_priv, &msg); 1934 if (!ret) 1935 cm_format_rej((struct cm_rej_msg *) msg->mad, 1936 cm_id_priv, reason, ari, ari_length, 1937 private_data, private_data_len); 1938 1939 cm_enter_timewait(cm_id_priv); 1940 break; 1941 default: 1942 ret = -EINVAL; 1943 goto out; 1944 } 1945 1946 if (ret) 1947 goto out; 1948 1949 ret = ib_post_send_mad(msg, NULL); 1950 if (ret) 1951 cm_free_msg(msg); 1952 1953out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1954 return ret; 1955} 1956EXPORT_SYMBOL(ib_send_cm_rej); 1957 1958static void cm_format_rej_event(struct cm_work *work) 1959{ 1960 struct cm_rej_msg *rej_msg; 1961 struct ib_cm_rej_event_param *param; 1962 1963 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 1964 param = &work->cm_event.param.rej_rcvd; 1965 param->ari = rej_msg->ari; 1966 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 1967 param->reason = __be16_to_cpu(rej_msg->reason); 1968 work->cm_event.private_data = &rej_msg->private_data; 1969} 1970 1971static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 1972{ 1973 struct cm_timewait_info *timewait_info; 1974 struct cm_id_private *cm_id_priv; 1975 unsigned long flags; 1976 __be32 remote_id; 1977 1978 remote_id = rej_msg->local_comm_id; 1979 1980 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 1981 spin_lock_irqsave(&cm.lock, flags); 1982 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 1983 remote_id); 1984 if (!timewait_info) { 1985 spin_unlock_irqrestore(&cm.lock, flags); 1986 return NULL; 1987 } 1988 cm_id_priv = idr_find(&cm.local_id_table, 1989 (__force int) timewait_info->work.local_id); 1990 if (cm_id_priv) { 1991 if (cm_id_priv->id.remote_id == remote_id) 1992 atomic_inc(&cm_id_priv->refcount); 1993 else 1994 cm_id_priv = NULL; 1995 } 1996 spin_unlock_irqrestore(&cm.lock, flags); 1997 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 1998 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 1999 else 2000 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2001 2002 return cm_id_priv; 2003} 2004 2005static int cm_rej_handler(struct cm_work *work) 2006{ 2007 struct cm_id_private *cm_id_priv; 2008 struct cm_rej_msg *rej_msg; 2009 unsigned long flags; 2010 int ret; 2011 2012 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2013 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2014 if (!cm_id_priv) 2015 return -EINVAL; 2016 2017 cm_format_rej_event(work); 2018 2019 spin_lock_irqsave(&cm_id_priv->lock, flags); 2020 switch (cm_id_priv->id.state) { 2021 case IB_CM_REQ_SENT: 2022 case IB_CM_MRA_REQ_RCVD: 2023 case IB_CM_REP_SENT: 2024 case IB_CM_MRA_REP_RCVD: 2025 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2026 /* fall through */ 2027 case IB_CM_REQ_RCVD: 2028 case IB_CM_MRA_REQ_SENT: 2029 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2030 cm_enter_timewait(cm_id_priv); 2031 else 2032 cm_reset_to_idle(cm_id_priv); 2033 break; 2034 case IB_CM_DREQ_SENT: 2035 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2036 /* fall through */ 2037 case IB_CM_REP_RCVD: 2038 case IB_CM_MRA_REP_SENT: 2039 case IB_CM_ESTABLISHED: 2040 cm_enter_timewait(cm_id_priv); 2041 break; 2042 default: 2043 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2044 ret = -EINVAL; 2045 goto out; 2046 } 2047 2048 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2049 if (!ret) 2050 list_add_tail(&work->list, &cm_id_priv->work_list); 2051 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2052 2053 if (ret) 2054 cm_process_work(cm_id_priv, work); 2055 else 2056 cm_deref_id(cm_id_priv); 2057 return 0; 2058out: 2059 cm_deref_id(cm_id_priv); 2060 return -EINVAL; 2061} 2062 2063int ib_send_cm_mra(struct ib_cm_id *cm_id, 2064 u8 service_timeout, 2065 const void *private_data, 2066 u8 private_data_len) 2067{ 2068 struct cm_id_private *cm_id_priv; 2069 struct ib_mad_send_buf *msg; 2070 void *data; 2071 unsigned long flags; 2072 int ret; 2073 2074 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2075 return -EINVAL; 2076 2077 data = cm_copy_private_data(private_data, private_data_len); 2078 if (IS_ERR(data)) 2079 return PTR_ERR(data); 2080 2081 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2082 2083 spin_lock_irqsave(&cm_id_priv->lock, flags); 2084 switch(cm_id_priv->id.state) { 2085 case IB_CM_REQ_RCVD: 2086 ret = cm_alloc_msg(cm_id_priv, &msg); 2087 if (ret) 2088 goto error1; 2089 2090 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2091 CM_MSG_RESPONSE_REQ, service_timeout, 2092 private_data, private_data_len); 2093 ret = ib_post_send_mad(msg, NULL); 2094 if (ret) 2095 goto error2; 2096 cm_id->state = IB_CM_MRA_REQ_SENT; 2097 break; 2098 case IB_CM_REP_RCVD: 2099 ret = cm_alloc_msg(cm_id_priv, &msg); 2100 if (ret) 2101 goto error1; 2102 2103 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2104 CM_MSG_RESPONSE_REP, service_timeout, 2105 private_data, private_data_len); 2106 ret = ib_post_send_mad(msg, NULL); 2107 if (ret) 2108 goto error2; 2109 cm_id->state = IB_CM_MRA_REP_SENT; 2110 break; 2111 case IB_CM_ESTABLISHED: 2112 ret = cm_alloc_msg(cm_id_priv, &msg); 2113 if (ret) 2114 goto error1; 2115 2116 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2117 CM_MSG_RESPONSE_OTHER, service_timeout, 2118 private_data, private_data_len); 2119 ret = ib_post_send_mad(msg, NULL); 2120 if (ret) 2121 goto error2; 2122 cm_id->lap_state = IB_CM_MRA_LAP_SENT; 2123 break; 2124 default: 2125 ret = -EINVAL; 2126 goto error1; 2127 } 2128 cm_id_priv->service_timeout = service_timeout; 2129 cm_set_private_data(cm_id_priv, data, private_data_len); 2130 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2131 return 0; 2132 2133error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2134 kfree(data); 2135 return ret; 2136 2137error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2138 kfree(data); 2139 cm_free_msg(msg); 2140 return ret; 2141} 2142EXPORT_SYMBOL(ib_send_cm_mra); 2143 2144static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2145{ 2146 switch (cm_mra_get_msg_mraed(mra_msg)) { 2147 case CM_MSG_RESPONSE_REQ: 2148 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2149 case CM_MSG_RESPONSE_REP: 2150 case CM_MSG_RESPONSE_OTHER: 2151 return cm_acquire_id(mra_msg->remote_comm_id, 2152 mra_msg->local_comm_id); 2153 default: 2154 return NULL; 2155 } 2156} 2157 2158static int cm_mra_handler(struct cm_work *work) 2159{ 2160 struct cm_id_private *cm_id_priv; 2161 struct cm_mra_msg *mra_msg; 2162 unsigned long flags; 2163 int timeout, ret; 2164 2165 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2166 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2167 if (!cm_id_priv) 2168 return -EINVAL; 2169 2170 work->cm_event.private_data = &mra_msg->private_data; 2171 work->cm_event.param.mra_rcvd.service_timeout = 2172 cm_mra_get_service_timeout(mra_msg); 2173 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2174 cm_convert_to_ms(cm_id_priv->av.packet_life_time); 2175 2176 spin_lock_irqsave(&cm_id_priv->lock, flags); 2177 switch (cm_id_priv->id.state) { 2178 case IB_CM_REQ_SENT: 2179 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2180 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2181 cm_id_priv->msg, timeout)) 2182 goto out; 2183 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2184 break; 2185 case IB_CM_REP_SENT: 2186 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2187 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2188 cm_id_priv->msg, timeout)) 2189 goto out; 2190 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2191 break; 2192 case IB_CM_ESTABLISHED: 2193 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2194 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2195 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2196 cm_id_priv->msg, timeout)) 2197 goto out; 2198 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2199 break; 2200 default: 2201 goto out; 2202 } 2203 2204 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2205 cm_id_priv->id.state; 2206 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2207 if (!ret) 2208 list_add_tail(&work->list, &cm_id_priv->work_list); 2209 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2210 2211 if (ret) 2212 cm_process_work(cm_id_priv, work); 2213 else 2214 cm_deref_id(cm_id_priv); 2215 return 0; 2216out: 2217 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2218 cm_deref_id(cm_id_priv); 2219 return -EINVAL; 2220} 2221 2222static void cm_format_lap(struct cm_lap_msg *lap_msg, 2223 struct cm_id_private *cm_id_priv, 2224 struct ib_sa_path_rec *alternate_path, 2225 const void *private_data, 2226 u8 private_data_len) 2227{ 2228 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2229 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2230 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2231 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2232 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2233 /* todo: need remote CM response timeout */ 2234 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2235 lap_msg->alt_local_lid = alternate_path->slid; 2236 lap_msg->alt_remote_lid = alternate_path->dlid; 2237 lap_msg->alt_local_gid = alternate_path->sgid; 2238 lap_msg->alt_remote_gid = alternate_path->dgid; 2239 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2240 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2241 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2242 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2243 cm_lap_set_sl(lap_msg, alternate_path->sl); 2244 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2245 cm_lap_set_local_ack_timeout(lap_msg, 2246 min(31, alternate_path->packet_life_time + 1)); 2247 2248 if (private_data && private_data_len) 2249 memcpy(lap_msg->private_data, private_data, private_data_len); 2250} 2251 2252int ib_send_cm_lap(struct ib_cm_id *cm_id, 2253 struct ib_sa_path_rec *alternate_path, 2254 const void *private_data, 2255 u8 private_data_len) 2256{ 2257 struct cm_id_private *cm_id_priv; 2258 struct ib_mad_send_buf *msg; 2259 unsigned long flags; 2260 int ret; 2261 2262 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2263 return -EINVAL; 2264 2265 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2266 spin_lock_irqsave(&cm_id_priv->lock, flags); 2267 if (cm_id->state != IB_CM_ESTABLISHED || 2268 cm_id->lap_state != IB_CM_LAP_IDLE) { 2269 ret = -EINVAL; 2270 goto out; 2271 } 2272 2273 ret = cm_alloc_msg(cm_id_priv, &msg); 2274 if (ret) 2275 goto out; 2276 2277 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2278 alternate_path, private_data, private_data_len); 2279 msg->timeout_ms = cm_id_priv->timeout_ms; 2280 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2281 2282 ret = ib_post_send_mad(msg, NULL); 2283 if (ret) { 2284 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2285 cm_free_msg(msg); 2286 return ret; 2287 } 2288 2289 cm_id->lap_state = IB_CM_LAP_SENT; 2290 cm_id_priv->msg = msg; 2291 2292out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2293 return ret; 2294} 2295EXPORT_SYMBOL(ib_send_cm_lap); 2296 2297static void cm_format_path_from_lap(struct ib_sa_path_rec *path, 2298 struct cm_lap_msg *lap_msg) 2299{ 2300 memset(path, 0, sizeof *path); 2301 path->dgid = lap_msg->alt_local_gid; 2302 path->sgid = lap_msg->alt_remote_gid; 2303 path->dlid = lap_msg->alt_local_lid; 2304 path->slid = lap_msg->alt_remote_lid; 2305 path->flow_label = cm_lap_get_flow_label(lap_msg); 2306 path->hop_limit = lap_msg->alt_hop_limit; 2307 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2308 path->reversible = 1; 2309 /* pkey is same as in REQ */ 2310 path->sl = cm_lap_get_sl(lap_msg); 2311 path->mtu_selector = IB_SA_EQ; 2312 /* mtu is same as in REQ */ 2313 path->rate_selector = IB_SA_EQ; 2314 path->rate = cm_lap_get_packet_rate(lap_msg); 2315 path->packet_life_time_selector = IB_SA_EQ; 2316 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2317 path->packet_life_time -= (path->packet_life_time > 0); 2318} 2319 2320static int cm_lap_handler(struct cm_work *work) 2321{ 2322 struct cm_id_private *cm_id_priv; 2323 struct cm_lap_msg *lap_msg; 2324 struct ib_cm_lap_event_param *param; 2325 struct ib_mad_send_buf *msg = NULL; 2326 unsigned long flags; 2327 int ret; 2328 2329 /* todo: verify LAP request and send reject APR if invalid. */ 2330 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2331 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2332 lap_msg->local_comm_id); 2333 if (!cm_id_priv) 2334 return -EINVAL; 2335 2336 param = &work->cm_event.param.lap_rcvd; 2337 param->alternate_path = &work->path[0]; 2338 cm_format_path_from_lap(param->alternate_path, lap_msg); 2339 work->cm_event.private_data = &lap_msg->private_data; 2340 2341 spin_lock_irqsave(&cm_id_priv->lock, flags); 2342 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2343 goto unlock; 2344 2345 switch (cm_id_priv->id.lap_state) { 2346 case IB_CM_LAP_IDLE: 2347 break; 2348 case IB_CM_MRA_LAP_SENT: 2349 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2350 goto unlock; 2351 2352 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2353 CM_MSG_RESPONSE_OTHER, 2354 cm_id_priv->service_timeout, 2355 cm_id_priv->private_data, 2356 cm_id_priv->private_data_len); 2357 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2358 2359 if (ib_post_send_mad(msg, NULL)) 2360 cm_free_msg(msg); 2361 goto deref; 2362 default: 2363 goto unlock; 2364 } 2365 2366 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2367 cm_id_priv->tid = lap_msg->hdr.tid; 2368 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2369 if (!ret) 2370 list_add_tail(&work->list, &cm_id_priv->work_list); 2371 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2372 2373 if (ret) 2374 cm_process_work(cm_id_priv, work); 2375 else 2376 cm_deref_id(cm_id_priv); 2377 return 0; 2378 2379unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2380deref: cm_deref_id(cm_id_priv); 2381 return -EINVAL; 2382} 2383 2384static void cm_format_apr(struct cm_apr_msg *apr_msg, 2385 struct cm_id_private *cm_id_priv, 2386 enum ib_cm_apr_status status, 2387 void *info, 2388 u8 info_length, 2389 const void *private_data, 2390 u8 private_data_len) 2391{ 2392 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2393 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2394 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2395 apr_msg->ap_status = (u8) status; 2396 2397 if (info && info_length) { 2398 apr_msg->info_length = info_length; 2399 memcpy(apr_msg->info, info, info_length); 2400 } 2401 2402 if (private_data && private_data_len) 2403 memcpy(apr_msg->private_data, private_data, private_data_len); 2404} 2405 2406int ib_send_cm_apr(struct ib_cm_id *cm_id, 2407 enum ib_cm_apr_status status, 2408 void *info, 2409 u8 info_length, 2410 const void *private_data, 2411 u8 private_data_len) 2412{ 2413 struct cm_id_private *cm_id_priv; 2414 struct ib_mad_send_buf *msg; 2415 unsigned long flags; 2416 int ret; 2417 2418 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2419 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2420 return -EINVAL; 2421 2422 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2423 spin_lock_irqsave(&cm_id_priv->lock, flags); 2424 if (cm_id->state != IB_CM_ESTABLISHED || 2425 (cm_id->lap_state != IB_CM_LAP_RCVD && 2426 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2427 ret = -EINVAL; 2428 goto out; 2429 } 2430 2431 ret = cm_alloc_msg(cm_id_priv, &msg); 2432 if (ret) 2433 goto out; 2434 2435 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2436 info, info_length, private_data, private_data_len); 2437 ret = ib_post_send_mad(msg, NULL); 2438 if (ret) { 2439 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2440 cm_free_msg(msg); 2441 return ret; 2442 } 2443 2444 cm_id->lap_state = IB_CM_LAP_IDLE; 2445out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2446 return ret; 2447} 2448EXPORT_SYMBOL(ib_send_cm_apr); 2449 2450static int cm_apr_handler(struct cm_work *work) 2451{ 2452 struct cm_id_private *cm_id_priv; 2453 struct cm_apr_msg *apr_msg; 2454 unsigned long flags; 2455 int ret; 2456 2457 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2458 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2459 apr_msg->local_comm_id); 2460 if (!cm_id_priv) 2461 return -EINVAL; /* Unmatched reply. */ 2462 2463 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2464 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2465 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2466 work->cm_event.private_data = &apr_msg->private_data; 2467 2468 spin_lock_irqsave(&cm_id_priv->lock, flags); 2469 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2470 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2471 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2472 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2473 goto out; 2474 } 2475 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2476 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2477 cm_id_priv->msg = NULL; 2478 2479 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2480 if (!ret) 2481 list_add_tail(&work->list, &cm_id_priv->work_list); 2482 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2483 2484 if (ret) 2485 cm_process_work(cm_id_priv, work); 2486 else 2487 cm_deref_id(cm_id_priv); 2488 return 0; 2489out: 2490 cm_deref_id(cm_id_priv); 2491 return -EINVAL; 2492} 2493 2494static int cm_timewait_handler(struct cm_work *work) 2495{ 2496 struct cm_timewait_info *timewait_info; 2497 struct cm_id_private *cm_id_priv; 2498 unsigned long flags; 2499 int ret; 2500 2501 timewait_info = (struct cm_timewait_info *)work; 2502 cm_cleanup_timewait(timewait_info); 2503 2504 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2505 timewait_info->work.remote_id); 2506 if (!cm_id_priv) 2507 return -EINVAL; 2508 2509 spin_lock_irqsave(&cm_id_priv->lock, flags); 2510 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2511 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2512 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2513 goto out; 2514 } 2515 cm_id_priv->id.state = IB_CM_IDLE; 2516 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2517 if (!ret) 2518 list_add_tail(&work->list, &cm_id_priv->work_list); 2519 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2520 2521 if (ret) 2522 cm_process_work(cm_id_priv, work); 2523 else 2524 cm_deref_id(cm_id_priv); 2525 return 0; 2526out: 2527 cm_deref_id(cm_id_priv); 2528 return -EINVAL; 2529} 2530 2531static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2532 struct cm_id_private *cm_id_priv, 2533 struct ib_cm_sidr_req_param *param) 2534{ 2535 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2536 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2537 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2538 sidr_req_msg->pkey = cpu_to_be16(param->pkey); 2539 sidr_req_msg->service_id = param->service_id; 2540 2541 if (param->private_data && param->private_data_len) 2542 memcpy(sidr_req_msg->private_data, param->private_data, 2543 param->private_data_len); 2544} 2545 2546int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2547 struct ib_cm_sidr_req_param *param) 2548{ 2549 struct cm_id_private *cm_id_priv; 2550 struct ib_mad_send_buf *msg; 2551 unsigned long flags; 2552 int ret; 2553 2554 if (!param->path || (param->private_data && 2555 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2556 return -EINVAL; 2557 2558 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2559 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2560 if (ret) 2561 goto out; 2562 2563 cm_id->service_id = param->service_id; 2564 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2565 cm_id_priv->timeout_ms = param->timeout_ms; 2566 cm_id_priv->max_cm_retries = param->max_cm_retries; 2567 ret = cm_alloc_msg(cm_id_priv, &msg); 2568 if (ret) 2569 goto out; 2570 2571 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2572 param); 2573 msg->timeout_ms = cm_id_priv->timeout_ms; 2574 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2575 2576 spin_lock_irqsave(&cm_id_priv->lock, flags); 2577 if (cm_id->state == IB_CM_IDLE) 2578 ret = ib_post_send_mad(msg, NULL); 2579 else 2580 ret = -EINVAL; 2581 2582 if (ret) { 2583 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2584 cm_free_msg(msg); 2585 goto out; 2586 } 2587 cm_id->state = IB_CM_SIDR_REQ_SENT; 2588 cm_id_priv->msg = msg; 2589 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2590out: 2591 return ret; 2592} 2593EXPORT_SYMBOL(ib_send_cm_sidr_req); 2594 2595static void cm_format_sidr_req_event(struct cm_work *work, 2596 struct ib_cm_id *listen_id) 2597{ 2598 struct cm_sidr_req_msg *sidr_req_msg; 2599 struct ib_cm_sidr_req_event_param *param; 2600 2601 sidr_req_msg = (struct cm_sidr_req_msg *) 2602 work->mad_recv_wc->recv_buf.mad; 2603 param = &work->cm_event.param.sidr_req_rcvd; 2604 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2605 param->listen_id = listen_id; 2606 param->port = work->port->port_num; 2607 work->cm_event.private_data = &sidr_req_msg->private_data; 2608} 2609 2610static int cm_sidr_req_handler(struct cm_work *work) 2611{ 2612 struct ib_cm_id *cm_id; 2613 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2614 struct cm_sidr_req_msg *sidr_req_msg; 2615 struct ib_wc *wc; 2616 unsigned long flags; 2617 2618 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2619 if (IS_ERR(cm_id)) 2620 return PTR_ERR(cm_id); 2621 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2622 2623 /* Record SGID/SLID and request ID for lookup. */ 2624 sidr_req_msg = (struct cm_sidr_req_msg *) 2625 work->mad_recv_wc->recv_buf.mad; 2626 wc = work->mad_recv_wc->wc; 2627 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2628 cm_id_priv->av.dgid.global.interface_id = 0; 2629 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2630 &cm_id_priv->av); 2631 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2632 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2633 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2634 atomic_inc(&cm_id_priv->work_count); 2635 2636 spin_lock_irqsave(&cm.lock, flags); 2637 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2638 if (cur_cm_id_priv) { 2639 spin_unlock_irqrestore(&cm.lock, flags); 2640 goto out; /* Duplicate message. */ 2641 } 2642 cur_cm_id_priv = cm_find_listen(cm_id->device, 2643 sidr_req_msg->service_id); 2644 if (!cur_cm_id_priv) { 2645 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2646 spin_unlock_irqrestore(&cm.lock, flags); 2647 /* todo: reply with no match */ 2648 goto out; /* No match. */ 2649 } 2650 atomic_inc(&cur_cm_id_priv->refcount); 2651 spin_unlock_irqrestore(&cm.lock, flags); 2652 2653 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2654 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2655 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2656 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2657 2658 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2659 cm_process_work(cm_id_priv, work); 2660 cm_deref_id(cur_cm_id_priv); 2661 return 0; 2662out: 2663 ib_destroy_cm_id(&cm_id_priv->id); 2664 return -EINVAL; 2665} 2666 2667static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2668 struct cm_id_private *cm_id_priv, 2669 struct ib_cm_sidr_rep_param *param) 2670{ 2671 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2672 cm_id_priv->tid); 2673 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2674 sidr_rep_msg->status = param->status; 2675 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2676 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2677 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2678 2679 if (param->info && param->info_length) 2680 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2681 2682 if (param->private_data && param->private_data_len) 2683 memcpy(sidr_rep_msg->private_data, param->private_data, 2684 param->private_data_len); 2685} 2686 2687int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2688 struct ib_cm_sidr_rep_param *param) 2689{ 2690 struct cm_id_private *cm_id_priv; 2691 struct ib_mad_send_buf *msg; 2692 unsigned long flags; 2693 int ret; 2694 2695 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2696 (param->private_data && 2697 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2698 return -EINVAL; 2699 2700 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2701 spin_lock_irqsave(&cm_id_priv->lock, flags); 2702 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2703 ret = -EINVAL; 2704 goto error; 2705 } 2706 2707 ret = cm_alloc_msg(cm_id_priv, &msg); 2708 if (ret) 2709 goto error; 2710 2711 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2712 param); 2713 ret = ib_post_send_mad(msg, NULL); 2714 if (ret) { 2715 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2716 cm_free_msg(msg); 2717 return ret; 2718 } 2719 cm_id->state = IB_CM_IDLE; 2720 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2721 2722 spin_lock_irqsave(&cm.lock, flags); 2723 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2724 spin_unlock_irqrestore(&cm.lock, flags); 2725 return 0; 2726 2727error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2728 return ret; 2729} 2730EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2731 2732static void cm_format_sidr_rep_event(struct cm_work *work) 2733{ 2734 struct cm_sidr_rep_msg *sidr_rep_msg; 2735 struct ib_cm_sidr_rep_event_param *param; 2736 2737 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2738 work->mad_recv_wc->recv_buf.mad; 2739 param = &work->cm_event.param.sidr_rep_rcvd; 2740 param->status = sidr_rep_msg->status; 2741 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2742 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2743 param->info = &sidr_rep_msg->info; 2744 param->info_len = sidr_rep_msg->info_length; 2745 work->cm_event.private_data = &sidr_rep_msg->private_data; 2746} 2747 2748static int cm_sidr_rep_handler(struct cm_work *work) 2749{ 2750 struct cm_sidr_rep_msg *sidr_rep_msg; 2751 struct cm_id_private *cm_id_priv; 2752 unsigned long flags; 2753 2754 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2755 work->mad_recv_wc->recv_buf.mad; 2756 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2757 if (!cm_id_priv) 2758 return -EINVAL; /* Unmatched reply. */ 2759 2760 spin_lock_irqsave(&cm_id_priv->lock, flags); 2761 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2762 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2763 goto out; 2764 } 2765 cm_id_priv->id.state = IB_CM_IDLE; 2766 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2767 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2768 2769 cm_format_sidr_rep_event(work); 2770 cm_process_work(cm_id_priv, work); 2771 return 0; 2772out: 2773 cm_deref_id(cm_id_priv); 2774 return -EINVAL; 2775} 2776 2777static void cm_process_send_error(struct ib_mad_send_buf *msg, 2778 enum ib_wc_status wc_status) 2779{ 2780 struct cm_id_private *cm_id_priv; 2781 struct ib_cm_event cm_event; 2782 enum ib_cm_state state; 2783 unsigned long flags; 2784 int ret; 2785 2786 memset(&cm_event, 0, sizeof cm_event); 2787 cm_id_priv = msg->context[0]; 2788 2789 /* Discard old sends or ones without a response. */ 2790 spin_lock_irqsave(&cm_id_priv->lock, flags); 2791 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2792 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2793 goto discard; 2794 2795 switch (state) { 2796 case IB_CM_REQ_SENT: 2797 case IB_CM_MRA_REQ_RCVD: 2798 cm_reset_to_idle(cm_id_priv); 2799 cm_event.event = IB_CM_REQ_ERROR; 2800 break; 2801 case IB_CM_REP_SENT: 2802 case IB_CM_MRA_REP_RCVD: 2803 cm_reset_to_idle(cm_id_priv); 2804 cm_event.event = IB_CM_REP_ERROR; 2805 break; 2806 case IB_CM_DREQ_SENT: 2807 cm_enter_timewait(cm_id_priv); 2808 cm_event.event = IB_CM_DREQ_ERROR; 2809 break; 2810 case IB_CM_SIDR_REQ_SENT: 2811 cm_id_priv->id.state = IB_CM_IDLE; 2812 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2813 break; 2814 default: 2815 goto discard; 2816 } 2817 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2818 cm_event.param.send_status = wc_status; 2819 2820 /* No other events can occur on the cm_id at this point. */ 2821 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2822 cm_free_msg(msg); 2823 if (ret) 2824 ib_destroy_cm_id(&cm_id_priv->id); 2825 return; 2826discard: 2827 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2828 cm_free_msg(msg); 2829} 2830 2831static void cm_send_handler(struct ib_mad_agent *mad_agent, 2832 struct ib_mad_send_wc *mad_send_wc) 2833{ 2834 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 2835 2836 switch (mad_send_wc->status) { 2837 case IB_WC_SUCCESS: 2838 case IB_WC_WR_FLUSH_ERR: 2839 cm_free_msg(msg); 2840 break; 2841 default: 2842 if (msg->context[0] && msg->context[1]) 2843 cm_process_send_error(msg, mad_send_wc->status); 2844 else 2845 cm_free_msg(msg); 2846 break; 2847 } 2848} 2849 2850static void cm_work_handler(void *data) 2851{ 2852 struct cm_work *work = data; 2853 int ret; 2854 2855 switch (work->cm_event.event) { 2856 case IB_CM_REQ_RECEIVED: 2857 ret = cm_req_handler(work); 2858 break; 2859 case IB_CM_MRA_RECEIVED: 2860 ret = cm_mra_handler(work); 2861 break; 2862 case IB_CM_REJ_RECEIVED: 2863 ret = cm_rej_handler(work); 2864 break; 2865 case IB_CM_REP_RECEIVED: 2866 ret = cm_rep_handler(work); 2867 break; 2868 case IB_CM_RTU_RECEIVED: 2869 ret = cm_rtu_handler(work); 2870 break; 2871 case IB_CM_USER_ESTABLISHED: 2872 ret = cm_establish_handler(work); 2873 break; 2874 case IB_CM_DREQ_RECEIVED: 2875 ret = cm_dreq_handler(work); 2876 break; 2877 case IB_CM_DREP_RECEIVED: 2878 ret = cm_drep_handler(work); 2879 break; 2880 case IB_CM_SIDR_REQ_RECEIVED: 2881 ret = cm_sidr_req_handler(work); 2882 break; 2883 case IB_CM_SIDR_REP_RECEIVED: 2884 ret = cm_sidr_rep_handler(work); 2885 break; 2886 case IB_CM_LAP_RECEIVED: 2887 ret = cm_lap_handler(work); 2888 break; 2889 case IB_CM_APR_RECEIVED: 2890 ret = cm_apr_handler(work); 2891 break; 2892 case IB_CM_TIMEWAIT_EXIT: 2893 ret = cm_timewait_handler(work); 2894 break; 2895 default: 2896 ret = -EINVAL; 2897 break; 2898 } 2899 if (ret) 2900 cm_free_work(work); 2901} 2902 2903int ib_cm_establish(struct ib_cm_id *cm_id) 2904{ 2905 struct cm_id_private *cm_id_priv; 2906 struct cm_work *work; 2907 unsigned long flags; 2908 int ret = 0; 2909 2910 work = kmalloc(sizeof *work, GFP_ATOMIC); 2911 if (!work) 2912 return -ENOMEM; 2913 2914 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2915 spin_lock_irqsave(&cm_id_priv->lock, flags); 2916 switch (cm_id->state) 2917 { 2918 case IB_CM_REP_SENT: 2919 case IB_CM_MRA_REP_RCVD: 2920 cm_id->state = IB_CM_ESTABLISHED; 2921 break; 2922 case IB_CM_ESTABLISHED: 2923 ret = -EISCONN; 2924 break; 2925 default: 2926 ret = -EINVAL; 2927 break; 2928 } 2929 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2930 2931 if (ret) { 2932 kfree(work); 2933 goto out; 2934 } 2935 2936 /* 2937 * The CM worker thread may try to destroy the cm_id before it 2938 * can execute this work item. To prevent potential deadlock, 2939 * we need to find the cm_id once we're in the context of the 2940 * worker thread, rather than holding a reference on it. 2941 */ 2942 INIT_WORK(&work->work, cm_work_handler, work); 2943 work->local_id = cm_id->local_id; 2944 work->remote_id = cm_id->remote_id; 2945 work->mad_recv_wc = NULL; 2946 work->cm_event.event = IB_CM_USER_ESTABLISHED; 2947 queue_work(cm.wq, &work->work); 2948out: 2949 return ret; 2950} 2951EXPORT_SYMBOL(ib_cm_establish); 2952 2953static void cm_recv_handler(struct ib_mad_agent *mad_agent, 2954 struct ib_mad_recv_wc *mad_recv_wc) 2955{ 2956 struct cm_work *work; 2957 enum ib_cm_event_type event; 2958 int paths = 0; 2959 2960 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 2961 case CM_REQ_ATTR_ID: 2962 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 2963 alt_local_lid != 0); 2964 event = IB_CM_REQ_RECEIVED; 2965 break; 2966 case CM_MRA_ATTR_ID: 2967 event = IB_CM_MRA_RECEIVED; 2968 break; 2969 case CM_REJ_ATTR_ID: 2970 event = IB_CM_REJ_RECEIVED; 2971 break; 2972 case CM_REP_ATTR_ID: 2973 event = IB_CM_REP_RECEIVED; 2974 break; 2975 case CM_RTU_ATTR_ID: 2976 event = IB_CM_RTU_RECEIVED; 2977 break; 2978 case CM_DREQ_ATTR_ID: 2979 event = IB_CM_DREQ_RECEIVED; 2980 break; 2981 case CM_DREP_ATTR_ID: 2982 event = IB_CM_DREP_RECEIVED; 2983 break; 2984 case CM_SIDR_REQ_ATTR_ID: 2985 event = IB_CM_SIDR_REQ_RECEIVED; 2986 break; 2987 case CM_SIDR_REP_ATTR_ID: 2988 event = IB_CM_SIDR_REP_RECEIVED; 2989 break; 2990 case CM_LAP_ATTR_ID: 2991 paths = 1; 2992 event = IB_CM_LAP_RECEIVED; 2993 break; 2994 case CM_APR_ATTR_ID: 2995 event = IB_CM_APR_RECEIVED; 2996 break; 2997 default: 2998 ib_free_recv_mad(mad_recv_wc); 2999 return; 3000 } 3001 3002 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3003 GFP_KERNEL); 3004 if (!work) { 3005 ib_free_recv_mad(mad_recv_wc); 3006 return; 3007 } 3008 3009 INIT_WORK(&work->work, cm_work_handler, work); 3010 work->cm_event.event = event; 3011 work->mad_recv_wc = mad_recv_wc; 3012 work->port = (struct cm_port *)mad_agent->context; 3013 queue_work(cm.wq, &work->work); 3014} 3015 3016static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3017 struct ib_qp_attr *qp_attr, 3018 int *qp_attr_mask) 3019{ 3020 unsigned long flags; 3021 int ret; 3022 3023 spin_lock_irqsave(&cm_id_priv->lock, flags); 3024 switch (cm_id_priv->id.state) { 3025 case IB_CM_REQ_SENT: 3026 case IB_CM_MRA_REQ_RCVD: 3027 case IB_CM_REQ_RCVD: 3028 case IB_CM_MRA_REQ_SENT: 3029 case IB_CM_REP_RCVD: 3030 case IB_CM_MRA_REP_SENT: 3031 case IB_CM_REP_SENT: 3032 case IB_CM_MRA_REP_RCVD: 3033 case IB_CM_ESTABLISHED: 3034 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3035 IB_QP_PKEY_INDEX | IB_QP_PORT; 3036 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | 3037 IB_ACCESS_REMOTE_WRITE; 3038 if (cm_id_priv->responder_resources) 3039 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ; 3040 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3041 qp_attr->port_num = cm_id_priv->av.port->port_num; 3042 ret = 0; 3043 break; 3044 default: 3045 ret = -EINVAL; 3046 break; 3047 } 3048 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3049 return ret; 3050} 3051 3052static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3053 struct ib_qp_attr *qp_attr, 3054 int *qp_attr_mask) 3055{ 3056 unsigned long flags; 3057 int ret; 3058 3059 spin_lock_irqsave(&cm_id_priv->lock, flags); 3060 switch (cm_id_priv->id.state) { 3061 case IB_CM_REQ_RCVD: 3062 case IB_CM_MRA_REQ_SENT: 3063 case IB_CM_REP_RCVD: 3064 case IB_CM_MRA_REP_SENT: 3065 case IB_CM_REP_SENT: 3066 case IB_CM_MRA_REP_RCVD: 3067 case IB_CM_ESTABLISHED: 3068 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3069 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3070 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3071 qp_attr->path_mtu = cm_id_priv->path_mtu; 3072 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3073 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3074 if (cm_id_priv->qp_type == IB_QPT_RC) { 3075 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3076 IB_QP_MIN_RNR_TIMER; 3077 qp_attr->max_dest_rd_atomic = 3078 cm_id_priv->responder_resources; 3079 qp_attr->min_rnr_timer = 0; 3080 } 3081 if (cm_id_priv->alt_av.ah_attr.dlid) { 3082 *qp_attr_mask |= IB_QP_ALT_PATH; 3083 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3084 } 3085 ret = 0; 3086 break; 3087 default: 3088 ret = -EINVAL; 3089 break; 3090 } 3091 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3092 return ret; 3093} 3094 3095static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3096 struct ib_qp_attr *qp_attr, 3097 int *qp_attr_mask) 3098{ 3099 unsigned long flags; 3100 int ret; 3101 3102 spin_lock_irqsave(&cm_id_priv->lock, flags); 3103 switch (cm_id_priv->id.state) { 3104 case IB_CM_REP_RCVD: 3105 case IB_CM_MRA_REP_SENT: 3106 case IB_CM_REP_SENT: 3107 case IB_CM_MRA_REP_RCVD: 3108 case IB_CM_ESTABLISHED: 3109 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3110 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3111 if (cm_id_priv->qp_type == IB_QPT_RC) { 3112 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3113 IB_QP_RNR_RETRY | 3114 IB_QP_MAX_QP_RD_ATOMIC; 3115 qp_attr->timeout = cm_id_priv->local_ack_timeout; 3116 qp_attr->retry_cnt = cm_id_priv->retry_count; 3117 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3118 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3119 } 3120 if (cm_id_priv->alt_av.ah_attr.dlid) { 3121 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3122 qp_attr->path_mig_state = IB_MIG_REARM; 3123 } 3124 ret = 0; 3125 break; 3126 default: 3127 ret = -EINVAL; 3128 break; 3129 } 3130 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3131 return ret; 3132} 3133 3134int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3135 struct ib_qp_attr *qp_attr, 3136 int *qp_attr_mask) 3137{ 3138 struct cm_id_private *cm_id_priv; 3139 int ret; 3140 3141 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3142 switch (qp_attr->qp_state) { 3143 case IB_QPS_INIT: 3144 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3145 break; 3146 case IB_QPS_RTR: 3147 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3148 break; 3149 case IB_QPS_RTS: 3150 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3151 break; 3152 default: 3153 ret = -EINVAL; 3154 break; 3155 } 3156 return ret; 3157} 3158EXPORT_SYMBOL(ib_cm_init_qp_attr); 3159 3160static __be64 cm_get_ca_guid(struct ib_device *device) 3161{ 3162 struct ib_device_attr *device_attr; 3163 __be64 guid; 3164 int ret; 3165 3166 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL); 3167 if (!device_attr) 3168 return 0; 3169 3170 ret = ib_query_device(device, device_attr); 3171 guid = ret ? 0 : device_attr->node_guid; 3172 kfree(device_attr); 3173 return guid; 3174} 3175 3176static void cm_add_one(struct ib_device *device) 3177{ 3178 struct cm_device *cm_dev; 3179 struct cm_port *port; 3180 struct ib_mad_reg_req reg_req = { 3181 .mgmt_class = IB_MGMT_CLASS_CM, 3182 .mgmt_class_version = IB_CM_CLASS_VERSION 3183 }; 3184 struct ib_port_modify port_modify = { 3185 .set_port_cap_mask = IB_PORT_CM_SUP 3186 }; 3187 unsigned long flags; 3188 int ret; 3189 u8 i; 3190 3191 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3192 device->phys_port_cnt, GFP_KERNEL); 3193 if (!cm_dev) 3194 return; 3195 3196 cm_dev->device = device; 3197 cm_dev->ca_guid = cm_get_ca_guid(device); 3198 if (!cm_dev->ca_guid) 3199 goto error1; 3200 3201 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3202 for (i = 1; i <= device->phys_port_cnt; i++) { 3203 port = &cm_dev->port[i-1]; 3204 port->cm_dev = cm_dev; 3205 port->port_num = i; 3206 port->mad_agent = ib_register_mad_agent(device, i, 3207 IB_QPT_GSI, 3208 ®_req, 3209 0, 3210 cm_send_handler, 3211 cm_recv_handler, 3212 port); 3213 if (IS_ERR(port->mad_agent)) 3214 goto error2; 3215 3216 ret = ib_modify_port(device, i, 0, &port_modify); 3217 if (ret) 3218 goto error3; 3219 } 3220 ib_set_client_data(device, &cm_client, cm_dev); 3221 3222 write_lock_irqsave(&cm.device_lock, flags); 3223 list_add_tail(&cm_dev->list, &cm.device_list); 3224 write_unlock_irqrestore(&cm.device_lock, flags); 3225 return; 3226 3227error3: 3228 ib_unregister_mad_agent(port->mad_agent); 3229error2: 3230 port_modify.set_port_cap_mask = 0; 3231 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3232 while (--i) { 3233 port = &cm_dev->port[i-1]; 3234 ib_modify_port(device, port->port_num, 0, &port_modify); 3235 ib_unregister_mad_agent(port->mad_agent); 3236 } 3237error1: 3238 kfree(cm_dev); 3239} 3240 3241static void cm_remove_one(struct ib_device *device) 3242{ 3243 struct cm_device *cm_dev; 3244 struct cm_port *port; 3245 struct ib_port_modify port_modify = { 3246 .clr_port_cap_mask = IB_PORT_CM_SUP 3247 }; 3248 unsigned long flags; 3249 int i; 3250 3251 cm_dev = ib_get_client_data(device, &cm_client); 3252 if (!cm_dev) 3253 return; 3254 3255 write_lock_irqsave(&cm.device_lock, flags); 3256 list_del(&cm_dev->list); 3257 write_unlock_irqrestore(&cm.device_lock, flags); 3258 3259 for (i = 1; i <= device->phys_port_cnt; i++) { 3260 port = &cm_dev->port[i-1]; 3261 ib_modify_port(device, port->port_num, 0, &port_modify); 3262 ib_unregister_mad_agent(port->mad_agent); 3263 } 3264 kfree(cm_dev); 3265} 3266 3267static int __init ib_cm_init(void) 3268{ 3269 int ret; 3270 3271 memset(&cm, 0, sizeof cm); 3272 INIT_LIST_HEAD(&cm.device_list); 3273 rwlock_init(&cm.device_lock); 3274 spin_lock_init(&cm.lock); 3275 cm.listen_service_table = RB_ROOT; 3276 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3277 cm.remote_id_table = RB_ROOT; 3278 cm.remote_qp_table = RB_ROOT; 3279 cm.remote_sidr_table = RB_ROOT; 3280 idr_init(&cm.local_id_table); 3281 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3282 3283 cm.wq = create_workqueue("ib_cm"); 3284 if (!cm.wq) 3285 return -ENOMEM; 3286 3287 ret = ib_register_client(&cm_client); 3288 if (ret) 3289 goto error; 3290 3291 return 0; 3292error: 3293 destroy_workqueue(cm.wq); 3294 return ret; 3295} 3296 3297static void __exit ib_cm_cleanup(void) 3298{ 3299 flush_workqueue(cm.wq); 3300 destroy_workqueue(cm.wq); 3301 ib_unregister_client(&cm_client); 3302 idr_destroy(&cm.local_id_table); 3303} 3304 3305module_init(ib_cm_init); 3306module_exit(ib_cm_cleanup); 3307 3308