cm.c revision c4028958b6ecad064b1a6303a6a5906d4fe48d73
1/* 2 * Copyright (c) 2004-2006 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 4311 2005-12-05 18:42:01Z sean.hefty $ 36 */ 37 38#include <linux/completion.h> 39#include <linux/dma-mapping.h> 40#include <linux/err.h> 41#include <linux/idr.h> 42#include <linux/interrupt.h> 43#include <linux/pci.h> 44#include <linux/random.h> 45#include <linux/rbtree.h> 46#include <linux/spinlock.h> 47#include <linux/workqueue.h> 48 49#include <rdma/ib_cache.h> 50#include <rdma/ib_cm.h> 51#include "cm_msgs.h" 52 53MODULE_AUTHOR("Sean Hefty"); 54MODULE_DESCRIPTION("InfiniBand CM"); 55MODULE_LICENSE("Dual BSD/GPL"); 56 57static void cm_add_one(struct ib_device *device); 58static void cm_remove_one(struct ib_device *device); 59 60static struct ib_client cm_client = { 61 .name = "cm", 62 .add = cm_add_one, 63 .remove = cm_remove_one 64}; 65 66static struct ib_cm { 67 spinlock_t lock; 68 struct list_head device_list; 69 rwlock_t device_lock; 70 struct rb_root listen_service_table; 71 u64 listen_service_id; 72 /* struct rb_root peer_service_table; todo: fix peer to peer */ 73 struct rb_root remote_qp_table; 74 struct rb_root remote_id_table; 75 struct rb_root remote_sidr_table; 76 struct idr local_id_table; 77 __be32 random_id_operand; 78 struct list_head timewait_list; 79 struct workqueue_struct *wq; 80} cm; 81 82struct cm_port { 83 struct cm_device *cm_dev; 84 struct ib_mad_agent *mad_agent; 85 u8 port_num; 86}; 87 88struct cm_device { 89 struct list_head list; 90 struct ib_device *device; 91 __be64 ca_guid; 92 struct cm_port port[0]; 93}; 94 95struct cm_av { 96 struct cm_port *port; 97 union ib_gid dgid; 98 struct ib_ah_attr ah_attr; 99 u16 pkey_index; 100 u8 packet_life_time; 101}; 102 103struct cm_work { 104 struct delayed_work work; 105 struct list_head list; 106 struct cm_port *port; 107 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 108 __be32 local_id; /* Established / timewait */ 109 __be32 remote_id; 110 struct ib_cm_event cm_event; 111 struct ib_sa_path_rec path[0]; 112}; 113 114struct cm_timewait_info { 115 struct cm_work work; /* Must be first. */ 116 struct list_head list; 117 struct rb_node remote_qp_node; 118 struct rb_node remote_id_node; 119 __be64 remote_ca_guid; 120 __be32 remote_qpn; 121 u8 inserted_remote_qp; 122 u8 inserted_remote_id; 123}; 124 125struct cm_id_private { 126 struct ib_cm_id id; 127 128 struct rb_node service_node; 129 struct rb_node sidr_id_node; 130 spinlock_t lock; /* Do not acquire inside cm.lock */ 131 struct completion comp; 132 atomic_t refcount; 133 134 struct ib_mad_send_buf *msg; 135 struct cm_timewait_info *timewait_info; 136 /* todo: use alternate port on send failure */ 137 struct cm_av av; 138 struct cm_av alt_av; 139 struct ib_cm_compare_data *compare_data; 140 141 void *private_data; 142 __be64 tid; 143 __be32 local_qpn; 144 __be32 remote_qpn; 145 enum ib_qp_type qp_type; 146 __be32 sq_psn; 147 __be32 rq_psn; 148 int timeout_ms; 149 enum ib_mtu path_mtu; 150 u8 private_data_len; 151 u8 max_cm_retries; 152 u8 peer_to_peer; 153 u8 responder_resources; 154 u8 initiator_depth; 155 u8 local_ack_timeout; 156 u8 retry_count; 157 u8 rnr_retry_count; 158 u8 service_timeout; 159 160 struct list_head work_list; 161 atomic_t work_count; 162}; 163 164static void cm_work_handler(struct work_struct *work); 165 166static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 167{ 168 if (atomic_dec_and_test(&cm_id_priv->refcount)) 169 complete(&cm_id_priv->comp); 170} 171 172static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 173 struct ib_mad_send_buf **msg) 174{ 175 struct ib_mad_agent *mad_agent; 176 struct ib_mad_send_buf *m; 177 struct ib_ah *ah; 178 179 mad_agent = cm_id_priv->av.port->mad_agent; 180 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 181 if (IS_ERR(ah)) 182 return PTR_ERR(ah); 183 184 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 185 cm_id_priv->av.pkey_index, 186 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 187 GFP_ATOMIC); 188 if (IS_ERR(m)) { 189 ib_destroy_ah(ah); 190 return PTR_ERR(m); 191 } 192 193 /* Timeout set by caller if response is expected. */ 194 m->ah = ah; 195 m->retries = cm_id_priv->max_cm_retries; 196 197 atomic_inc(&cm_id_priv->refcount); 198 m->context[0] = cm_id_priv; 199 *msg = m; 200 return 0; 201} 202 203static int cm_alloc_response_msg(struct cm_port *port, 204 struct ib_mad_recv_wc *mad_recv_wc, 205 struct ib_mad_send_buf **msg) 206{ 207 struct ib_mad_send_buf *m; 208 struct ib_ah *ah; 209 210 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 211 mad_recv_wc->recv_buf.grh, port->port_num); 212 if (IS_ERR(ah)) 213 return PTR_ERR(ah); 214 215 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 216 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 217 GFP_ATOMIC); 218 if (IS_ERR(m)) { 219 ib_destroy_ah(ah); 220 return PTR_ERR(m); 221 } 222 m->ah = ah; 223 *msg = m; 224 return 0; 225} 226 227static void cm_free_msg(struct ib_mad_send_buf *msg) 228{ 229 ib_destroy_ah(msg->ah); 230 if (msg->context[0]) 231 cm_deref_id(msg->context[0]); 232 ib_free_send_mad(msg); 233} 234 235static void * cm_copy_private_data(const void *private_data, 236 u8 private_data_len) 237{ 238 void *data; 239 240 if (!private_data || !private_data_len) 241 return NULL; 242 243 data = kmalloc(private_data_len, GFP_KERNEL); 244 if (!data) 245 return ERR_PTR(-ENOMEM); 246 247 memcpy(data, private_data, private_data_len); 248 return data; 249} 250 251static void cm_set_private_data(struct cm_id_private *cm_id_priv, 252 void *private_data, u8 private_data_len) 253{ 254 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 255 kfree(cm_id_priv->private_data); 256 257 cm_id_priv->private_data = private_data; 258 cm_id_priv->private_data_len = private_data_len; 259} 260 261static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 262 struct ib_grh *grh, struct cm_av *av) 263{ 264 av->port = port; 265 av->pkey_index = wc->pkey_index; 266 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc, 267 grh, &av->ah_attr); 268} 269 270static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 271{ 272 struct cm_device *cm_dev; 273 struct cm_port *port = NULL; 274 unsigned long flags; 275 int ret; 276 u8 p; 277 278 read_lock_irqsave(&cm.device_lock, flags); 279 list_for_each_entry(cm_dev, &cm.device_list, list) { 280 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 281 &p, NULL)) { 282 port = &cm_dev->port[p-1]; 283 break; 284 } 285 } 286 read_unlock_irqrestore(&cm.device_lock, flags); 287 288 if (!port) 289 return -EINVAL; 290 291 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 292 be16_to_cpu(path->pkey), &av->pkey_index); 293 if (ret) 294 return ret; 295 296 av->port = port; 297 ib_init_ah_from_path(cm_dev->device, port->port_num, path, 298 &av->ah_attr); 299 av->packet_life_time = path->packet_life_time; 300 return 0; 301} 302 303static int cm_alloc_id(struct cm_id_private *cm_id_priv) 304{ 305 unsigned long flags; 306 int ret, id; 307 static int next_id; 308 309 do { 310 spin_lock_irqsave(&cm.lock, flags); 311 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 312 next_id++, &id); 313 spin_unlock_irqrestore(&cm.lock, flags); 314 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 315 316 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand); 317 return ret; 318} 319 320static void cm_free_id(__be32 local_id) 321{ 322 unsigned long flags; 323 324 spin_lock_irqsave(&cm.lock, flags); 325 idr_remove(&cm.local_id_table, 326 (__force int) (local_id ^ cm.random_id_operand)); 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, 335 (__force int) (local_id ^ cm.random_id_operand)); 336 if (cm_id_priv) { 337 if (cm_id_priv->id.remote_id == remote_id) 338 atomic_inc(&cm_id_priv->refcount); 339 else 340 cm_id_priv = NULL; 341 } 342 343 return cm_id_priv; 344} 345 346static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 347{ 348 struct cm_id_private *cm_id_priv; 349 unsigned long flags; 350 351 spin_lock_irqsave(&cm.lock, flags); 352 cm_id_priv = cm_get_id(local_id, remote_id); 353 spin_unlock_irqrestore(&cm.lock, flags); 354 355 return cm_id_priv; 356} 357 358static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 359{ 360 int i; 361 362 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 363 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 364 ((unsigned long *) mask)[i]; 365} 366 367static int cm_compare_data(struct ib_cm_compare_data *src_data, 368 struct ib_cm_compare_data *dst_data) 369{ 370 u8 src[IB_CM_COMPARE_SIZE]; 371 u8 dst[IB_CM_COMPARE_SIZE]; 372 373 if (!src_data || !dst_data) 374 return 0; 375 376 cm_mask_copy(src, src_data->data, dst_data->mask); 377 cm_mask_copy(dst, dst_data->data, src_data->mask); 378 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 379} 380 381static int cm_compare_private_data(u8 *private_data, 382 struct ib_cm_compare_data *dst_data) 383{ 384 u8 src[IB_CM_COMPARE_SIZE]; 385 386 if (!dst_data) 387 return 0; 388 389 cm_mask_copy(src, private_data, dst_data->mask); 390 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 391} 392 393static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 394{ 395 struct rb_node **link = &cm.listen_service_table.rb_node; 396 struct rb_node *parent = NULL; 397 struct cm_id_private *cur_cm_id_priv; 398 __be64 service_id = cm_id_priv->id.service_id; 399 __be64 service_mask = cm_id_priv->id.service_mask; 400 int data_cmp; 401 402 while (*link) { 403 parent = *link; 404 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 405 service_node); 406 data_cmp = cm_compare_data(cm_id_priv->compare_data, 407 cur_cm_id_priv->compare_data); 408 if ((cur_cm_id_priv->id.service_mask & service_id) == 409 (service_mask & cur_cm_id_priv->id.service_id) && 410 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 411 !data_cmp) 412 return cur_cm_id_priv; 413 414 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 415 link = &(*link)->rb_left; 416 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 417 link = &(*link)->rb_right; 418 else if (service_id < cur_cm_id_priv->id.service_id) 419 link = &(*link)->rb_left; 420 else if (service_id > cur_cm_id_priv->id.service_id) 421 link = &(*link)->rb_right; 422 else if (data_cmp < 0) 423 link = &(*link)->rb_left; 424 else 425 link = &(*link)->rb_right; 426 } 427 rb_link_node(&cm_id_priv->service_node, parent, link); 428 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 429 return NULL; 430} 431 432static struct cm_id_private * cm_find_listen(struct ib_device *device, 433 __be64 service_id, 434 u8 *private_data) 435{ 436 struct rb_node *node = cm.listen_service_table.rb_node; 437 struct cm_id_private *cm_id_priv; 438 int data_cmp; 439 440 while (node) { 441 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 442 data_cmp = cm_compare_private_data(private_data, 443 cm_id_priv->compare_data); 444 if ((cm_id_priv->id.service_mask & service_id) == 445 cm_id_priv->id.service_id && 446 (cm_id_priv->id.device == device) && !data_cmp) 447 return cm_id_priv; 448 449 if (device < cm_id_priv->id.device) 450 node = node->rb_left; 451 else if (device > cm_id_priv->id.device) 452 node = node->rb_right; 453 else if (service_id < cm_id_priv->id.service_id) 454 node = node->rb_left; 455 else if (service_id > cm_id_priv->id.service_id) 456 node = node->rb_right; 457 else if (data_cmp < 0) 458 node = node->rb_left; 459 else 460 node = node->rb_right; 461 } 462 return NULL; 463} 464 465static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 466 *timewait_info) 467{ 468 struct rb_node **link = &cm.remote_id_table.rb_node; 469 struct rb_node *parent = NULL; 470 struct cm_timewait_info *cur_timewait_info; 471 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 472 __be32 remote_id = timewait_info->work.remote_id; 473 474 while (*link) { 475 parent = *link; 476 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 477 remote_id_node); 478 if (remote_id < cur_timewait_info->work.remote_id) 479 link = &(*link)->rb_left; 480 else if (remote_id > cur_timewait_info->work.remote_id) 481 link = &(*link)->rb_right; 482 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 483 link = &(*link)->rb_left; 484 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 485 link = &(*link)->rb_right; 486 else 487 return cur_timewait_info; 488 } 489 timewait_info->inserted_remote_id = 1; 490 rb_link_node(&timewait_info->remote_id_node, parent, link); 491 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 492 return NULL; 493} 494 495static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 496 __be32 remote_id) 497{ 498 struct rb_node *node = cm.remote_id_table.rb_node; 499 struct cm_timewait_info *timewait_info; 500 501 while (node) { 502 timewait_info = rb_entry(node, struct cm_timewait_info, 503 remote_id_node); 504 if (remote_id < timewait_info->work.remote_id) 505 node = node->rb_left; 506 else if (remote_id > timewait_info->work.remote_id) 507 node = node->rb_right; 508 else if (remote_ca_guid < timewait_info->remote_ca_guid) 509 node = node->rb_left; 510 else if (remote_ca_guid > timewait_info->remote_ca_guid) 511 node = node->rb_right; 512 else 513 return timewait_info; 514 } 515 return NULL; 516} 517 518static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 519 *timewait_info) 520{ 521 struct rb_node **link = &cm.remote_qp_table.rb_node; 522 struct rb_node *parent = NULL; 523 struct cm_timewait_info *cur_timewait_info; 524 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 525 __be32 remote_qpn = timewait_info->remote_qpn; 526 527 while (*link) { 528 parent = *link; 529 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 530 remote_qp_node); 531 if (remote_qpn < cur_timewait_info->remote_qpn) 532 link = &(*link)->rb_left; 533 else if (remote_qpn > cur_timewait_info->remote_qpn) 534 link = &(*link)->rb_right; 535 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 536 link = &(*link)->rb_left; 537 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 538 link = &(*link)->rb_right; 539 else 540 return cur_timewait_info; 541 } 542 timewait_info->inserted_remote_qp = 1; 543 rb_link_node(&timewait_info->remote_qp_node, parent, link); 544 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 545 return NULL; 546} 547 548static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 549 *cm_id_priv) 550{ 551 struct rb_node **link = &cm.remote_sidr_table.rb_node; 552 struct rb_node *parent = NULL; 553 struct cm_id_private *cur_cm_id_priv; 554 union ib_gid *port_gid = &cm_id_priv->av.dgid; 555 __be32 remote_id = cm_id_priv->id.remote_id; 556 557 while (*link) { 558 parent = *link; 559 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 560 sidr_id_node); 561 if (remote_id < cur_cm_id_priv->id.remote_id) 562 link = &(*link)->rb_left; 563 else if (remote_id > cur_cm_id_priv->id.remote_id) 564 link = &(*link)->rb_right; 565 else { 566 int cmp; 567 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 568 sizeof *port_gid); 569 if (cmp < 0) 570 link = &(*link)->rb_left; 571 else if (cmp > 0) 572 link = &(*link)->rb_right; 573 else 574 return cur_cm_id_priv; 575 } 576 } 577 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 578 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 579 return NULL; 580} 581 582static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 583 enum ib_cm_sidr_status status) 584{ 585 struct ib_cm_sidr_rep_param param; 586 587 memset(¶m, 0, sizeof param); 588 param.status = status; 589 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 590} 591 592struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 593 ib_cm_handler cm_handler, 594 void *context) 595{ 596 struct cm_id_private *cm_id_priv; 597 int ret; 598 599 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 600 if (!cm_id_priv) 601 return ERR_PTR(-ENOMEM); 602 603 cm_id_priv->id.state = IB_CM_IDLE; 604 cm_id_priv->id.device = device; 605 cm_id_priv->id.cm_handler = cm_handler; 606 cm_id_priv->id.context = context; 607 cm_id_priv->id.remote_cm_qpn = 1; 608 ret = cm_alloc_id(cm_id_priv); 609 if (ret) 610 goto error; 611 612 spin_lock_init(&cm_id_priv->lock); 613 init_completion(&cm_id_priv->comp); 614 INIT_LIST_HEAD(&cm_id_priv->work_list); 615 atomic_set(&cm_id_priv->work_count, -1); 616 atomic_set(&cm_id_priv->refcount, 1); 617 return &cm_id_priv->id; 618 619error: 620 kfree(cm_id_priv); 621 return ERR_PTR(-ENOMEM); 622} 623EXPORT_SYMBOL(ib_create_cm_id); 624 625static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 626{ 627 struct cm_work *work; 628 629 if (list_empty(&cm_id_priv->work_list)) 630 return NULL; 631 632 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 633 list_del(&work->list); 634 return work; 635} 636 637static void cm_free_work(struct cm_work *work) 638{ 639 if (work->mad_recv_wc) 640 ib_free_recv_mad(work->mad_recv_wc); 641 kfree(work); 642} 643 644static inline int cm_convert_to_ms(int iba_time) 645{ 646 /* approximate conversion to ms from 4.096us x 2^iba_time */ 647 return 1 << max(iba_time - 8, 0); 648} 649 650static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 651{ 652 if (timewait_info->inserted_remote_id) { 653 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 654 timewait_info->inserted_remote_id = 0; 655 } 656 657 if (timewait_info->inserted_remote_qp) { 658 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 659 timewait_info->inserted_remote_qp = 0; 660 } 661} 662 663static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 664{ 665 struct cm_timewait_info *timewait_info; 666 667 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 668 if (!timewait_info) 669 return ERR_PTR(-ENOMEM); 670 671 timewait_info->work.local_id = local_id; 672 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 673 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 674 return timewait_info; 675} 676 677static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 678{ 679 int wait_time; 680 unsigned long flags; 681 682 spin_lock_irqsave(&cm.lock, flags); 683 cm_cleanup_timewait(cm_id_priv->timewait_info); 684 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 685 spin_unlock_irqrestore(&cm.lock, flags); 686 687 /* 688 * The cm_id could be destroyed by the user before we exit timewait. 689 * To protect against this, we search for the cm_id after exiting 690 * timewait before notifying the user that we've exited timewait. 691 */ 692 cm_id_priv->id.state = IB_CM_TIMEWAIT; 693 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout); 694 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 695 msecs_to_jiffies(wait_time)); 696 cm_id_priv->timewait_info = NULL; 697} 698 699static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 700{ 701 unsigned long flags; 702 703 cm_id_priv->id.state = IB_CM_IDLE; 704 if (cm_id_priv->timewait_info) { 705 spin_lock_irqsave(&cm.lock, flags); 706 cm_cleanup_timewait(cm_id_priv->timewait_info); 707 spin_unlock_irqrestore(&cm.lock, flags); 708 kfree(cm_id_priv->timewait_info); 709 cm_id_priv->timewait_info = NULL; 710 } 711} 712 713static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 714{ 715 struct cm_id_private *cm_id_priv; 716 struct cm_work *work; 717 unsigned long flags; 718 719 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 720retest: 721 spin_lock_irqsave(&cm_id_priv->lock, flags); 722 switch (cm_id->state) { 723 case IB_CM_LISTEN: 724 cm_id->state = IB_CM_IDLE; 725 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 726 spin_lock_irqsave(&cm.lock, flags); 727 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 728 spin_unlock_irqrestore(&cm.lock, flags); 729 break; 730 case IB_CM_SIDR_REQ_SENT: 731 cm_id->state = IB_CM_IDLE; 732 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 733 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 734 break; 735 case IB_CM_SIDR_REQ_RCVD: 736 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 737 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 738 break; 739 case IB_CM_REQ_SENT: 740 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 741 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 742 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 743 &cm_id_priv->av.port->cm_dev->ca_guid, 744 sizeof cm_id_priv->av.port->cm_dev->ca_guid, 745 NULL, 0); 746 break; 747 case IB_CM_REQ_RCVD: 748 if (err == -ENOMEM) { 749 /* Do not reject to allow future retries. */ 750 cm_reset_to_idle(cm_id_priv); 751 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 752 } else { 753 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 754 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 755 NULL, 0, NULL, 0); 756 } 757 break; 758 case IB_CM_MRA_REQ_RCVD: 759 case IB_CM_REP_SENT: 760 case IB_CM_MRA_REP_RCVD: 761 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 762 /* Fall through */ 763 case IB_CM_MRA_REQ_SENT: 764 case IB_CM_REP_RCVD: 765 case IB_CM_MRA_REP_SENT: 766 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 767 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 768 NULL, 0, NULL, 0); 769 break; 770 case IB_CM_ESTABLISHED: 771 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 772 ib_send_cm_dreq(cm_id, NULL, 0); 773 goto retest; 774 case IB_CM_DREQ_SENT: 775 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 776 cm_enter_timewait(cm_id_priv); 777 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 778 break; 779 case IB_CM_DREQ_RCVD: 780 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 781 ib_send_cm_drep(cm_id, NULL, 0); 782 break; 783 default: 784 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 785 break; 786 } 787 788 cm_free_id(cm_id->local_id); 789 cm_deref_id(cm_id_priv); 790 wait_for_completion(&cm_id_priv->comp); 791 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 792 cm_free_work(work); 793 kfree(cm_id_priv->compare_data); 794 kfree(cm_id_priv->private_data); 795 kfree(cm_id_priv); 796} 797 798void ib_destroy_cm_id(struct ib_cm_id *cm_id) 799{ 800 cm_destroy_id(cm_id, 0); 801} 802EXPORT_SYMBOL(ib_destroy_cm_id); 803 804int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 805 struct ib_cm_compare_data *compare_data) 806{ 807 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 808 unsigned long flags; 809 int ret = 0; 810 811 service_mask = service_mask ? service_mask : 812 __constant_cpu_to_be64(~0ULL); 813 service_id &= service_mask; 814 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 815 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 816 return -EINVAL; 817 818 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 819 if (cm_id->state != IB_CM_IDLE) 820 return -EINVAL; 821 822 if (compare_data) { 823 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 824 GFP_KERNEL); 825 if (!cm_id_priv->compare_data) 826 return -ENOMEM; 827 cm_mask_copy(cm_id_priv->compare_data->data, 828 compare_data->data, compare_data->mask); 829 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 830 IB_CM_COMPARE_SIZE); 831 } 832 833 cm_id->state = IB_CM_LISTEN; 834 835 spin_lock_irqsave(&cm.lock, flags); 836 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 837 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 838 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 839 } else { 840 cm_id->service_id = service_id; 841 cm_id->service_mask = service_mask; 842 } 843 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 844 spin_unlock_irqrestore(&cm.lock, flags); 845 846 if (cur_cm_id_priv) { 847 cm_id->state = IB_CM_IDLE; 848 kfree(cm_id_priv->compare_data); 849 cm_id_priv->compare_data = NULL; 850 ret = -EBUSY; 851 } 852 return ret; 853} 854EXPORT_SYMBOL(ib_cm_listen); 855 856static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 857 enum cm_msg_sequence msg_seq) 858{ 859 u64 hi_tid, low_tid; 860 861 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 862 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 863 (msg_seq << 30)); 864 return cpu_to_be64(hi_tid | low_tid); 865} 866 867static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 868 __be16 attr_id, __be64 tid) 869{ 870 hdr->base_version = IB_MGMT_BASE_VERSION; 871 hdr->mgmt_class = IB_MGMT_CLASS_CM; 872 hdr->class_version = IB_CM_CLASS_VERSION; 873 hdr->method = IB_MGMT_METHOD_SEND; 874 hdr->attr_id = attr_id; 875 hdr->tid = tid; 876} 877 878static void cm_format_req(struct cm_req_msg *req_msg, 879 struct cm_id_private *cm_id_priv, 880 struct ib_cm_req_param *param) 881{ 882 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 883 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 884 885 req_msg->local_comm_id = cm_id_priv->id.local_id; 886 req_msg->service_id = param->service_id; 887 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 888 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 889 cm_req_set_resp_res(req_msg, param->responder_resources); 890 cm_req_set_init_depth(req_msg, param->initiator_depth); 891 cm_req_set_remote_resp_timeout(req_msg, 892 param->remote_cm_response_timeout); 893 cm_req_set_qp_type(req_msg, param->qp_type); 894 cm_req_set_flow_ctrl(req_msg, param->flow_control); 895 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 896 cm_req_set_local_resp_timeout(req_msg, 897 param->local_cm_response_timeout); 898 cm_req_set_retry_count(req_msg, param->retry_count); 899 req_msg->pkey = param->primary_path->pkey; 900 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 901 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 902 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 903 cm_req_set_srq(req_msg, param->srq); 904 905 req_msg->primary_local_lid = param->primary_path->slid; 906 req_msg->primary_remote_lid = param->primary_path->dlid; 907 req_msg->primary_local_gid = param->primary_path->sgid; 908 req_msg->primary_remote_gid = param->primary_path->dgid; 909 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 910 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 911 req_msg->primary_traffic_class = param->primary_path->traffic_class; 912 req_msg->primary_hop_limit = param->primary_path->hop_limit; 913 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 914 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 915 cm_req_set_primary_local_ack_timeout(req_msg, 916 min(31, param->primary_path->packet_life_time + 1)); 917 918 if (param->alternate_path) { 919 req_msg->alt_local_lid = param->alternate_path->slid; 920 req_msg->alt_remote_lid = param->alternate_path->dlid; 921 req_msg->alt_local_gid = param->alternate_path->sgid; 922 req_msg->alt_remote_gid = param->alternate_path->dgid; 923 cm_req_set_alt_flow_label(req_msg, 924 param->alternate_path->flow_label); 925 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 926 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 927 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 928 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 929 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 930 cm_req_set_alt_local_ack_timeout(req_msg, 931 min(31, param->alternate_path->packet_life_time + 1)); 932 } 933 934 if (param->private_data && param->private_data_len) 935 memcpy(req_msg->private_data, param->private_data, 936 param->private_data_len); 937} 938 939static int cm_validate_req_param(struct ib_cm_req_param *param) 940{ 941 /* peer-to-peer not supported */ 942 if (param->peer_to_peer) 943 return -EINVAL; 944 945 if (!param->primary_path) 946 return -EINVAL; 947 948 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 949 return -EINVAL; 950 951 if (param->private_data && 952 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 953 return -EINVAL; 954 955 if (param->alternate_path && 956 (param->alternate_path->pkey != param->primary_path->pkey || 957 param->alternate_path->mtu != param->primary_path->mtu)) 958 return -EINVAL; 959 960 return 0; 961} 962 963int ib_send_cm_req(struct ib_cm_id *cm_id, 964 struct ib_cm_req_param *param) 965{ 966 struct cm_id_private *cm_id_priv; 967 struct cm_req_msg *req_msg; 968 unsigned long flags; 969 int ret; 970 971 ret = cm_validate_req_param(param); 972 if (ret) 973 return ret; 974 975 /* Verify that we're not in timewait. */ 976 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 977 spin_lock_irqsave(&cm_id_priv->lock, flags); 978 if (cm_id->state != IB_CM_IDLE) { 979 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 980 ret = -EINVAL; 981 goto out; 982 } 983 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 984 985 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 986 id.local_id); 987 if (IS_ERR(cm_id_priv->timewait_info)) { 988 ret = PTR_ERR(cm_id_priv->timewait_info); 989 goto out; 990 } 991 992 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 993 if (ret) 994 goto error1; 995 if (param->alternate_path) { 996 ret = cm_init_av_by_path(param->alternate_path, 997 &cm_id_priv->alt_av); 998 if (ret) 999 goto error1; 1000 } 1001 cm_id->service_id = param->service_id; 1002 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 1003 cm_id_priv->timeout_ms = cm_convert_to_ms( 1004 param->primary_path->packet_life_time) * 2 + 1005 cm_convert_to_ms( 1006 param->remote_cm_response_timeout); 1007 cm_id_priv->max_cm_retries = param->max_cm_retries; 1008 cm_id_priv->initiator_depth = param->initiator_depth; 1009 cm_id_priv->responder_resources = param->responder_resources; 1010 cm_id_priv->retry_count = param->retry_count; 1011 cm_id_priv->path_mtu = param->primary_path->mtu; 1012 cm_id_priv->qp_type = param->qp_type; 1013 1014 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1015 if (ret) 1016 goto error1; 1017 1018 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1019 cm_format_req(req_msg, cm_id_priv, param); 1020 cm_id_priv->tid = req_msg->hdr.tid; 1021 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1022 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1023 1024 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1025 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1026 cm_id_priv->local_ack_timeout = 1027 cm_req_get_primary_local_ack_timeout(req_msg); 1028 1029 spin_lock_irqsave(&cm_id_priv->lock, flags); 1030 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1031 if (ret) { 1032 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1033 goto error2; 1034 } 1035 BUG_ON(cm_id->state != IB_CM_IDLE); 1036 cm_id->state = IB_CM_REQ_SENT; 1037 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1038 return 0; 1039 1040error2: cm_free_msg(cm_id_priv->msg); 1041error1: kfree(cm_id_priv->timewait_info); 1042out: return ret; 1043} 1044EXPORT_SYMBOL(ib_send_cm_req); 1045 1046static int cm_issue_rej(struct cm_port *port, 1047 struct ib_mad_recv_wc *mad_recv_wc, 1048 enum ib_cm_rej_reason reason, 1049 enum cm_msg_response msg_rejected, 1050 void *ari, u8 ari_length) 1051{ 1052 struct ib_mad_send_buf *msg = NULL; 1053 struct cm_rej_msg *rej_msg, *rcv_msg; 1054 int ret; 1055 1056 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1057 if (ret) 1058 return ret; 1059 1060 /* We just need common CM header information. Cast to any message. */ 1061 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1062 rej_msg = (struct cm_rej_msg *) msg->mad; 1063 1064 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1065 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1066 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1067 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1068 rej_msg->reason = cpu_to_be16(reason); 1069 1070 if (ari && ari_length) { 1071 cm_rej_set_reject_info_len(rej_msg, ari_length); 1072 memcpy(rej_msg->ari, ari, ari_length); 1073 } 1074 1075 ret = ib_post_send_mad(msg, NULL); 1076 if (ret) 1077 cm_free_msg(msg); 1078 1079 return ret; 1080} 1081 1082static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1083 __be32 local_qpn, __be32 remote_qpn) 1084{ 1085 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1086 ((local_ca_guid == remote_ca_guid) && 1087 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1088} 1089 1090static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1091 struct ib_sa_path_rec *primary_path, 1092 struct ib_sa_path_rec *alt_path) 1093{ 1094 memset(primary_path, 0, sizeof *primary_path); 1095 primary_path->dgid = req_msg->primary_local_gid; 1096 primary_path->sgid = req_msg->primary_remote_gid; 1097 primary_path->dlid = req_msg->primary_local_lid; 1098 primary_path->slid = req_msg->primary_remote_lid; 1099 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1100 primary_path->hop_limit = req_msg->primary_hop_limit; 1101 primary_path->traffic_class = req_msg->primary_traffic_class; 1102 primary_path->reversible = 1; 1103 primary_path->pkey = req_msg->pkey; 1104 primary_path->sl = cm_req_get_primary_sl(req_msg); 1105 primary_path->mtu_selector = IB_SA_EQ; 1106 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1107 primary_path->rate_selector = IB_SA_EQ; 1108 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1109 primary_path->packet_life_time_selector = IB_SA_EQ; 1110 primary_path->packet_life_time = 1111 cm_req_get_primary_local_ack_timeout(req_msg); 1112 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1113 1114 if (req_msg->alt_local_lid) { 1115 memset(alt_path, 0, sizeof *alt_path); 1116 alt_path->dgid = req_msg->alt_local_gid; 1117 alt_path->sgid = req_msg->alt_remote_gid; 1118 alt_path->dlid = req_msg->alt_local_lid; 1119 alt_path->slid = req_msg->alt_remote_lid; 1120 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1121 alt_path->hop_limit = req_msg->alt_hop_limit; 1122 alt_path->traffic_class = req_msg->alt_traffic_class; 1123 alt_path->reversible = 1; 1124 alt_path->pkey = req_msg->pkey; 1125 alt_path->sl = cm_req_get_alt_sl(req_msg); 1126 alt_path->mtu_selector = IB_SA_EQ; 1127 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1128 alt_path->rate_selector = IB_SA_EQ; 1129 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1130 alt_path->packet_life_time_selector = IB_SA_EQ; 1131 alt_path->packet_life_time = 1132 cm_req_get_alt_local_ack_timeout(req_msg); 1133 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1134 } 1135} 1136 1137static void cm_format_req_event(struct cm_work *work, 1138 struct cm_id_private *cm_id_priv, 1139 struct ib_cm_id *listen_id) 1140{ 1141 struct cm_req_msg *req_msg; 1142 struct ib_cm_req_event_param *param; 1143 1144 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1145 param = &work->cm_event.param.req_rcvd; 1146 param->listen_id = listen_id; 1147 param->port = cm_id_priv->av.port->port_num; 1148 param->primary_path = &work->path[0]; 1149 if (req_msg->alt_local_lid) 1150 param->alternate_path = &work->path[1]; 1151 else 1152 param->alternate_path = NULL; 1153 param->remote_ca_guid = req_msg->local_ca_guid; 1154 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1155 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1156 param->qp_type = cm_req_get_qp_type(req_msg); 1157 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1158 param->responder_resources = cm_req_get_init_depth(req_msg); 1159 param->initiator_depth = cm_req_get_resp_res(req_msg); 1160 param->local_cm_response_timeout = 1161 cm_req_get_remote_resp_timeout(req_msg); 1162 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1163 param->remote_cm_response_timeout = 1164 cm_req_get_local_resp_timeout(req_msg); 1165 param->retry_count = cm_req_get_retry_count(req_msg); 1166 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1167 param->srq = cm_req_get_srq(req_msg); 1168 work->cm_event.private_data = &req_msg->private_data; 1169} 1170 1171static void cm_process_work(struct cm_id_private *cm_id_priv, 1172 struct cm_work *work) 1173{ 1174 unsigned long flags; 1175 int ret; 1176 1177 /* We will typically only have the current event to report. */ 1178 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1179 cm_free_work(work); 1180 1181 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1182 spin_lock_irqsave(&cm_id_priv->lock, flags); 1183 work = cm_dequeue_work(cm_id_priv); 1184 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1185 BUG_ON(!work); 1186 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1187 &work->cm_event); 1188 cm_free_work(work); 1189 } 1190 cm_deref_id(cm_id_priv); 1191 if (ret) 1192 cm_destroy_id(&cm_id_priv->id, ret); 1193} 1194 1195static void cm_format_mra(struct cm_mra_msg *mra_msg, 1196 struct cm_id_private *cm_id_priv, 1197 enum cm_msg_response msg_mraed, u8 service_timeout, 1198 const void *private_data, u8 private_data_len) 1199{ 1200 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1201 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1202 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1203 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1204 cm_mra_set_service_timeout(mra_msg, service_timeout); 1205 1206 if (private_data && private_data_len) 1207 memcpy(mra_msg->private_data, private_data, private_data_len); 1208} 1209 1210static void cm_format_rej(struct cm_rej_msg *rej_msg, 1211 struct cm_id_private *cm_id_priv, 1212 enum ib_cm_rej_reason reason, 1213 void *ari, 1214 u8 ari_length, 1215 const void *private_data, 1216 u8 private_data_len) 1217{ 1218 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1219 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1220 1221 switch(cm_id_priv->id.state) { 1222 case IB_CM_REQ_RCVD: 1223 rej_msg->local_comm_id = 0; 1224 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1225 break; 1226 case IB_CM_MRA_REQ_SENT: 1227 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1228 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1229 break; 1230 case IB_CM_REP_RCVD: 1231 case IB_CM_MRA_REP_SENT: 1232 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1233 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1234 break; 1235 default: 1236 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1237 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1238 break; 1239 } 1240 1241 rej_msg->reason = cpu_to_be16(reason); 1242 if (ari && ari_length) { 1243 cm_rej_set_reject_info_len(rej_msg, ari_length); 1244 memcpy(rej_msg->ari, ari, ari_length); 1245 } 1246 1247 if (private_data && private_data_len) 1248 memcpy(rej_msg->private_data, private_data, private_data_len); 1249} 1250 1251static void cm_dup_req_handler(struct cm_work *work, 1252 struct cm_id_private *cm_id_priv) 1253{ 1254 struct ib_mad_send_buf *msg = NULL; 1255 unsigned long flags; 1256 int ret; 1257 1258 /* Quick state check to discard duplicate REQs. */ 1259 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1260 return; 1261 1262 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1263 if (ret) 1264 return; 1265 1266 spin_lock_irqsave(&cm_id_priv->lock, flags); 1267 switch (cm_id_priv->id.state) { 1268 case IB_CM_MRA_REQ_SENT: 1269 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1270 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1271 cm_id_priv->private_data, 1272 cm_id_priv->private_data_len); 1273 break; 1274 case IB_CM_TIMEWAIT: 1275 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1276 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1277 break; 1278 default: 1279 goto unlock; 1280 } 1281 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1282 1283 ret = ib_post_send_mad(msg, NULL); 1284 if (ret) 1285 goto free; 1286 return; 1287 1288unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1289free: cm_free_msg(msg); 1290} 1291 1292static struct cm_id_private * cm_match_req(struct cm_work *work, 1293 struct cm_id_private *cm_id_priv) 1294{ 1295 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1296 struct cm_timewait_info *timewait_info; 1297 struct cm_req_msg *req_msg; 1298 unsigned long flags; 1299 1300 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1301 1302 /* Check for duplicate REQ and stale connections. */ 1303 spin_lock_irqsave(&cm.lock, flags); 1304 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1305 if (!timewait_info) 1306 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1307 1308 if (timewait_info) { 1309 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1310 timewait_info->work.remote_id); 1311 cm_cleanup_timewait(cm_id_priv->timewait_info); 1312 spin_unlock_irqrestore(&cm.lock, flags); 1313 if (cur_cm_id_priv) { 1314 cm_dup_req_handler(work, cur_cm_id_priv); 1315 cm_deref_id(cur_cm_id_priv); 1316 } else 1317 cm_issue_rej(work->port, work->mad_recv_wc, 1318 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1319 NULL, 0); 1320 listen_cm_id_priv = NULL; 1321 goto out; 1322 } 1323 1324 /* Find matching listen request. */ 1325 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1326 req_msg->service_id, 1327 req_msg->private_data); 1328 if (!listen_cm_id_priv) { 1329 cm_cleanup_timewait(cm_id_priv->timewait_info); 1330 spin_unlock_irqrestore(&cm.lock, flags); 1331 cm_issue_rej(work->port, work->mad_recv_wc, 1332 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1333 NULL, 0); 1334 goto out; 1335 } 1336 atomic_inc(&listen_cm_id_priv->refcount); 1337 atomic_inc(&cm_id_priv->refcount); 1338 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1339 atomic_inc(&cm_id_priv->work_count); 1340 spin_unlock_irqrestore(&cm.lock, flags); 1341out: 1342 return listen_cm_id_priv; 1343} 1344 1345static int cm_req_handler(struct cm_work *work) 1346{ 1347 struct ib_cm_id *cm_id; 1348 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1349 struct cm_req_msg *req_msg; 1350 int ret; 1351 1352 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1353 1354 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1355 if (IS_ERR(cm_id)) 1356 return PTR_ERR(cm_id); 1357 1358 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1359 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1360 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1361 work->mad_recv_wc->recv_buf.grh, 1362 &cm_id_priv->av); 1363 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1364 id.local_id); 1365 if (IS_ERR(cm_id_priv->timewait_info)) { 1366 ret = PTR_ERR(cm_id_priv->timewait_info); 1367 goto destroy; 1368 } 1369 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1370 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1371 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1372 1373 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1374 if (!listen_cm_id_priv) { 1375 ret = -EINVAL; 1376 kfree(cm_id_priv->timewait_info); 1377 goto destroy; 1378 } 1379 1380 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1381 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1382 cm_id_priv->id.service_id = req_msg->service_id; 1383 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1384 1385 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1386 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1387 if (ret) { 1388 ib_get_cached_gid(work->port->cm_dev->device, 1389 work->port->port_num, 0, &work->path[0].sgid); 1390 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1391 &work->path[0].sgid, sizeof work->path[0].sgid, 1392 NULL, 0); 1393 goto rejected; 1394 } 1395 if (req_msg->alt_local_lid) { 1396 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1397 if (ret) { 1398 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1399 &work->path[0].sgid, 1400 sizeof work->path[0].sgid, NULL, 0); 1401 goto rejected; 1402 } 1403 } 1404 cm_id_priv->tid = req_msg->hdr.tid; 1405 cm_id_priv->timeout_ms = cm_convert_to_ms( 1406 cm_req_get_local_resp_timeout(req_msg)); 1407 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1408 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1409 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1410 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1411 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1412 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1413 cm_id_priv->local_ack_timeout = 1414 cm_req_get_primary_local_ack_timeout(req_msg); 1415 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1416 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1417 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1418 1419 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1420 cm_process_work(cm_id_priv, work); 1421 cm_deref_id(listen_cm_id_priv); 1422 return 0; 1423 1424rejected: 1425 atomic_dec(&cm_id_priv->refcount); 1426 cm_deref_id(listen_cm_id_priv); 1427destroy: 1428 ib_destroy_cm_id(cm_id); 1429 return ret; 1430} 1431 1432static void cm_format_rep(struct cm_rep_msg *rep_msg, 1433 struct cm_id_private *cm_id_priv, 1434 struct ib_cm_rep_param *param) 1435{ 1436 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1437 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1438 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1439 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1440 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1441 rep_msg->resp_resources = param->responder_resources; 1442 rep_msg->initiator_depth = param->initiator_depth; 1443 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay); 1444 cm_rep_set_failover(rep_msg, param->failover_accepted); 1445 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1446 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1447 cm_rep_set_srq(rep_msg, param->srq); 1448 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 1449 1450 if (param->private_data && param->private_data_len) 1451 memcpy(rep_msg->private_data, param->private_data, 1452 param->private_data_len); 1453} 1454 1455int ib_send_cm_rep(struct ib_cm_id *cm_id, 1456 struct ib_cm_rep_param *param) 1457{ 1458 struct cm_id_private *cm_id_priv; 1459 struct ib_mad_send_buf *msg; 1460 struct cm_rep_msg *rep_msg; 1461 unsigned long flags; 1462 int ret; 1463 1464 if (param->private_data && 1465 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1466 return -EINVAL; 1467 1468 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1469 spin_lock_irqsave(&cm_id_priv->lock, flags); 1470 if (cm_id->state != IB_CM_REQ_RCVD && 1471 cm_id->state != IB_CM_MRA_REQ_SENT) { 1472 ret = -EINVAL; 1473 goto out; 1474 } 1475 1476 ret = cm_alloc_msg(cm_id_priv, &msg); 1477 if (ret) 1478 goto out; 1479 1480 rep_msg = (struct cm_rep_msg *) msg->mad; 1481 cm_format_rep(rep_msg, cm_id_priv, param); 1482 msg->timeout_ms = cm_id_priv->timeout_ms; 1483 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1484 1485 ret = ib_post_send_mad(msg, NULL); 1486 if (ret) { 1487 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1488 cm_free_msg(msg); 1489 return ret; 1490 } 1491 1492 cm_id->state = IB_CM_REP_SENT; 1493 cm_id_priv->msg = msg; 1494 cm_id_priv->initiator_depth = param->initiator_depth; 1495 cm_id_priv->responder_resources = param->responder_resources; 1496 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1497 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1498 1499out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1500 return ret; 1501} 1502EXPORT_SYMBOL(ib_send_cm_rep); 1503 1504static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1505 struct cm_id_private *cm_id_priv, 1506 const void *private_data, 1507 u8 private_data_len) 1508{ 1509 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1510 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1511 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1512 1513 if (private_data && private_data_len) 1514 memcpy(rtu_msg->private_data, private_data, private_data_len); 1515} 1516 1517int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1518 const void *private_data, 1519 u8 private_data_len) 1520{ 1521 struct cm_id_private *cm_id_priv; 1522 struct ib_mad_send_buf *msg; 1523 unsigned long flags; 1524 void *data; 1525 int ret; 1526 1527 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1528 return -EINVAL; 1529 1530 data = cm_copy_private_data(private_data, private_data_len); 1531 if (IS_ERR(data)) 1532 return PTR_ERR(data); 1533 1534 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1535 spin_lock_irqsave(&cm_id_priv->lock, flags); 1536 if (cm_id->state != IB_CM_REP_RCVD && 1537 cm_id->state != IB_CM_MRA_REP_SENT) { 1538 ret = -EINVAL; 1539 goto error; 1540 } 1541 1542 ret = cm_alloc_msg(cm_id_priv, &msg); 1543 if (ret) 1544 goto error; 1545 1546 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1547 private_data, private_data_len); 1548 1549 ret = ib_post_send_mad(msg, NULL); 1550 if (ret) { 1551 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1552 cm_free_msg(msg); 1553 kfree(data); 1554 return ret; 1555 } 1556 1557 cm_id->state = IB_CM_ESTABLISHED; 1558 cm_set_private_data(cm_id_priv, data, private_data_len); 1559 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1560 return 0; 1561 1562error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1563 kfree(data); 1564 return ret; 1565} 1566EXPORT_SYMBOL(ib_send_cm_rtu); 1567 1568static void cm_format_rep_event(struct cm_work *work) 1569{ 1570 struct cm_rep_msg *rep_msg; 1571 struct ib_cm_rep_event_param *param; 1572 1573 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1574 param = &work->cm_event.param.rep_rcvd; 1575 param->remote_ca_guid = rep_msg->local_ca_guid; 1576 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1577 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1578 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1579 param->responder_resources = rep_msg->initiator_depth; 1580 param->initiator_depth = rep_msg->resp_resources; 1581 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1582 param->failover_accepted = cm_rep_get_failover(rep_msg); 1583 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1584 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1585 param->srq = cm_rep_get_srq(rep_msg); 1586 work->cm_event.private_data = &rep_msg->private_data; 1587} 1588 1589static void cm_dup_rep_handler(struct cm_work *work) 1590{ 1591 struct cm_id_private *cm_id_priv; 1592 struct cm_rep_msg *rep_msg; 1593 struct ib_mad_send_buf *msg = NULL; 1594 unsigned long flags; 1595 int ret; 1596 1597 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1598 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1599 rep_msg->local_comm_id); 1600 if (!cm_id_priv) 1601 return; 1602 1603 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1604 if (ret) 1605 goto deref; 1606 1607 spin_lock_irqsave(&cm_id_priv->lock, flags); 1608 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1609 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1610 cm_id_priv->private_data, 1611 cm_id_priv->private_data_len); 1612 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1613 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1614 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1615 cm_id_priv->private_data, 1616 cm_id_priv->private_data_len); 1617 else 1618 goto unlock; 1619 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1620 1621 ret = ib_post_send_mad(msg, NULL); 1622 if (ret) 1623 goto free; 1624 goto deref; 1625 1626unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1627free: cm_free_msg(msg); 1628deref: cm_deref_id(cm_id_priv); 1629} 1630 1631static int cm_rep_handler(struct cm_work *work) 1632{ 1633 struct cm_id_private *cm_id_priv; 1634 struct cm_rep_msg *rep_msg; 1635 unsigned long flags; 1636 int ret; 1637 1638 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1639 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1640 if (!cm_id_priv) { 1641 cm_dup_rep_handler(work); 1642 return -EINVAL; 1643 } 1644 1645 cm_format_rep_event(work); 1646 1647 spin_lock_irqsave(&cm_id_priv->lock, flags); 1648 switch (cm_id_priv->id.state) { 1649 case IB_CM_REQ_SENT: 1650 case IB_CM_MRA_REQ_RCVD: 1651 break; 1652 default: 1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1654 ret = -EINVAL; 1655 goto error; 1656 } 1657 1658 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1659 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1660 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1661 1662 spin_lock(&cm.lock); 1663 /* Check for duplicate REP. */ 1664 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1665 spin_unlock(&cm.lock); 1666 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1667 ret = -EINVAL; 1668 goto error; 1669 } 1670 /* Check for a stale connection. */ 1671 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1672 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1673 &cm.remote_id_table); 1674 cm_id_priv->timewait_info->inserted_remote_id = 0; 1675 spin_unlock(&cm.lock); 1676 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1677 cm_issue_rej(work->port, work->mad_recv_wc, 1678 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1679 NULL, 0); 1680 ret = -EINVAL; 1681 goto error; 1682 } 1683 spin_unlock(&cm.lock); 1684 1685 cm_id_priv->id.state = IB_CM_REP_RCVD; 1686 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1687 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1688 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1689 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1690 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1691 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1692 1693 /* todo: handle peer_to_peer */ 1694 1695 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1696 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1697 if (!ret) 1698 list_add_tail(&work->list, &cm_id_priv->work_list); 1699 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1700 1701 if (ret) 1702 cm_process_work(cm_id_priv, work); 1703 else 1704 cm_deref_id(cm_id_priv); 1705 return 0; 1706 1707error: 1708 cm_deref_id(cm_id_priv); 1709 return ret; 1710} 1711 1712static int cm_establish_handler(struct cm_work *work) 1713{ 1714 struct cm_id_private *cm_id_priv; 1715 unsigned long flags; 1716 int ret; 1717 1718 /* See comment in ib_cm_establish about lookup. */ 1719 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1720 if (!cm_id_priv) 1721 return -EINVAL; 1722 1723 spin_lock_irqsave(&cm_id_priv->lock, flags); 1724 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1726 goto out; 1727 } 1728 1729 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1730 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1731 if (!ret) 1732 list_add_tail(&work->list, &cm_id_priv->work_list); 1733 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1734 1735 if (ret) 1736 cm_process_work(cm_id_priv, work); 1737 else 1738 cm_deref_id(cm_id_priv); 1739 return 0; 1740out: 1741 cm_deref_id(cm_id_priv); 1742 return -EINVAL; 1743} 1744 1745static int cm_rtu_handler(struct cm_work *work) 1746{ 1747 struct cm_id_private *cm_id_priv; 1748 struct cm_rtu_msg *rtu_msg; 1749 unsigned long flags; 1750 int ret; 1751 1752 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1753 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1754 rtu_msg->local_comm_id); 1755 if (!cm_id_priv) 1756 return -EINVAL; 1757 1758 work->cm_event.private_data = &rtu_msg->private_data; 1759 1760 spin_lock_irqsave(&cm_id_priv->lock, flags); 1761 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1762 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1763 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1764 goto out; 1765 } 1766 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1767 1768 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1769 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1770 if (!ret) 1771 list_add_tail(&work->list, &cm_id_priv->work_list); 1772 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1773 1774 if (ret) 1775 cm_process_work(cm_id_priv, work); 1776 else 1777 cm_deref_id(cm_id_priv); 1778 return 0; 1779out: 1780 cm_deref_id(cm_id_priv); 1781 return -EINVAL; 1782} 1783 1784static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1785 struct cm_id_private *cm_id_priv, 1786 const void *private_data, 1787 u8 private_data_len) 1788{ 1789 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1790 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1791 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1792 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1793 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1794 1795 if (private_data && private_data_len) 1796 memcpy(dreq_msg->private_data, private_data, private_data_len); 1797} 1798 1799int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1800 const void *private_data, 1801 u8 private_data_len) 1802{ 1803 struct cm_id_private *cm_id_priv; 1804 struct ib_mad_send_buf *msg; 1805 unsigned long flags; 1806 int ret; 1807 1808 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1809 return -EINVAL; 1810 1811 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1812 spin_lock_irqsave(&cm_id_priv->lock, flags); 1813 if (cm_id->state != IB_CM_ESTABLISHED) { 1814 ret = -EINVAL; 1815 goto out; 1816 } 1817 1818 ret = cm_alloc_msg(cm_id_priv, &msg); 1819 if (ret) { 1820 cm_enter_timewait(cm_id_priv); 1821 goto out; 1822 } 1823 1824 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1825 private_data, private_data_len); 1826 msg->timeout_ms = cm_id_priv->timeout_ms; 1827 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1828 1829 ret = ib_post_send_mad(msg, NULL); 1830 if (ret) { 1831 cm_enter_timewait(cm_id_priv); 1832 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1833 cm_free_msg(msg); 1834 return ret; 1835 } 1836 1837 cm_id->state = IB_CM_DREQ_SENT; 1838 cm_id_priv->msg = msg; 1839out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1840 return ret; 1841} 1842EXPORT_SYMBOL(ib_send_cm_dreq); 1843 1844static void cm_format_drep(struct cm_drep_msg *drep_msg, 1845 struct cm_id_private *cm_id_priv, 1846 const void *private_data, 1847 u8 private_data_len) 1848{ 1849 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1850 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1851 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1852 1853 if (private_data && private_data_len) 1854 memcpy(drep_msg->private_data, private_data, private_data_len); 1855} 1856 1857int ib_send_cm_drep(struct ib_cm_id *cm_id, 1858 const void *private_data, 1859 u8 private_data_len) 1860{ 1861 struct cm_id_private *cm_id_priv; 1862 struct ib_mad_send_buf *msg; 1863 unsigned long flags; 1864 void *data; 1865 int ret; 1866 1867 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1868 return -EINVAL; 1869 1870 data = cm_copy_private_data(private_data, private_data_len); 1871 if (IS_ERR(data)) 1872 return PTR_ERR(data); 1873 1874 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1875 spin_lock_irqsave(&cm_id_priv->lock, flags); 1876 if (cm_id->state != IB_CM_DREQ_RCVD) { 1877 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1878 kfree(data); 1879 return -EINVAL; 1880 } 1881 1882 cm_set_private_data(cm_id_priv, data, private_data_len); 1883 cm_enter_timewait(cm_id_priv); 1884 1885 ret = cm_alloc_msg(cm_id_priv, &msg); 1886 if (ret) 1887 goto out; 1888 1889 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1890 private_data, private_data_len); 1891 1892 ret = ib_post_send_mad(msg, NULL); 1893 if (ret) { 1894 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1895 cm_free_msg(msg); 1896 return ret; 1897 } 1898 1899out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1900 return ret; 1901} 1902EXPORT_SYMBOL(ib_send_cm_drep); 1903 1904static int cm_issue_drep(struct cm_port *port, 1905 struct ib_mad_recv_wc *mad_recv_wc) 1906{ 1907 struct ib_mad_send_buf *msg = NULL; 1908 struct cm_dreq_msg *dreq_msg; 1909 struct cm_drep_msg *drep_msg; 1910 int ret; 1911 1912 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1913 if (ret) 1914 return ret; 1915 1916 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 1917 drep_msg = (struct cm_drep_msg *) msg->mad; 1918 1919 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 1920 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 1921 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 1922 1923 ret = ib_post_send_mad(msg, NULL); 1924 if (ret) 1925 cm_free_msg(msg); 1926 1927 return ret; 1928} 1929 1930static int cm_dreq_handler(struct cm_work *work) 1931{ 1932 struct cm_id_private *cm_id_priv; 1933 struct cm_dreq_msg *dreq_msg; 1934 struct ib_mad_send_buf *msg = NULL; 1935 unsigned long flags; 1936 int ret; 1937 1938 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1939 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1940 dreq_msg->local_comm_id); 1941 if (!cm_id_priv) { 1942 cm_issue_drep(work->port, work->mad_recv_wc); 1943 return -EINVAL; 1944 } 1945 1946 work->cm_event.private_data = &dreq_msg->private_data; 1947 1948 spin_lock_irqsave(&cm_id_priv->lock, flags); 1949 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1950 goto unlock; 1951 1952 switch (cm_id_priv->id.state) { 1953 case IB_CM_REP_SENT: 1954 case IB_CM_DREQ_SENT: 1955 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1956 break; 1957 case IB_CM_ESTABLISHED: 1958 case IB_CM_MRA_REP_RCVD: 1959 break; 1960 case IB_CM_TIMEWAIT: 1961 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1962 goto unlock; 1963 1964 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1965 cm_id_priv->private_data, 1966 cm_id_priv->private_data_len); 1967 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1968 1969 if (ib_post_send_mad(msg, NULL)) 1970 cm_free_msg(msg); 1971 goto deref; 1972 default: 1973 goto unlock; 1974 } 1975 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 1976 cm_id_priv->tid = dreq_msg->hdr.tid; 1977 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1978 if (!ret) 1979 list_add_tail(&work->list, &cm_id_priv->work_list); 1980 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1981 1982 if (ret) 1983 cm_process_work(cm_id_priv, work); 1984 else 1985 cm_deref_id(cm_id_priv); 1986 return 0; 1987 1988unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1989deref: cm_deref_id(cm_id_priv); 1990 return -EINVAL; 1991} 1992 1993static int cm_drep_handler(struct cm_work *work) 1994{ 1995 struct cm_id_private *cm_id_priv; 1996 struct cm_drep_msg *drep_msg; 1997 unsigned long flags; 1998 int ret; 1999 2000 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2001 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2002 drep_msg->local_comm_id); 2003 if (!cm_id_priv) 2004 return -EINVAL; 2005 2006 work->cm_event.private_data = &drep_msg->private_data; 2007 2008 spin_lock_irqsave(&cm_id_priv->lock, flags); 2009 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2010 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2011 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2012 goto out; 2013 } 2014 cm_enter_timewait(cm_id_priv); 2015 2016 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2017 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2018 if (!ret) 2019 list_add_tail(&work->list, &cm_id_priv->work_list); 2020 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2021 2022 if (ret) 2023 cm_process_work(cm_id_priv, work); 2024 else 2025 cm_deref_id(cm_id_priv); 2026 return 0; 2027out: 2028 cm_deref_id(cm_id_priv); 2029 return -EINVAL; 2030} 2031 2032int ib_send_cm_rej(struct ib_cm_id *cm_id, 2033 enum ib_cm_rej_reason reason, 2034 void *ari, 2035 u8 ari_length, 2036 const void *private_data, 2037 u8 private_data_len) 2038{ 2039 struct cm_id_private *cm_id_priv; 2040 struct ib_mad_send_buf *msg; 2041 unsigned long flags; 2042 int ret; 2043 2044 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2045 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2046 return -EINVAL; 2047 2048 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2049 2050 spin_lock_irqsave(&cm_id_priv->lock, flags); 2051 switch (cm_id->state) { 2052 case IB_CM_REQ_SENT: 2053 case IB_CM_MRA_REQ_RCVD: 2054 case IB_CM_REQ_RCVD: 2055 case IB_CM_MRA_REQ_SENT: 2056 case IB_CM_REP_RCVD: 2057 case IB_CM_MRA_REP_SENT: 2058 ret = cm_alloc_msg(cm_id_priv, &msg); 2059 if (!ret) 2060 cm_format_rej((struct cm_rej_msg *) msg->mad, 2061 cm_id_priv, reason, ari, ari_length, 2062 private_data, private_data_len); 2063 2064 cm_reset_to_idle(cm_id_priv); 2065 break; 2066 case IB_CM_REP_SENT: 2067 case IB_CM_MRA_REP_RCVD: 2068 ret = cm_alloc_msg(cm_id_priv, &msg); 2069 if (!ret) 2070 cm_format_rej((struct cm_rej_msg *) msg->mad, 2071 cm_id_priv, reason, ari, ari_length, 2072 private_data, private_data_len); 2073 2074 cm_enter_timewait(cm_id_priv); 2075 break; 2076 default: 2077 ret = -EINVAL; 2078 goto out; 2079 } 2080 2081 if (ret) 2082 goto out; 2083 2084 ret = ib_post_send_mad(msg, NULL); 2085 if (ret) 2086 cm_free_msg(msg); 2087 2088out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2089 return ret; 2090} 2091EXPORT_SYMBOL(ib_send_cm_rej); 2092 2093static void cm_format_rej_event(struct cm_work *work) 2094{ 2095 struct cm_rej_msg *rej_msg; 2096 struct ib_cm_rej_event_param *param; 2097 2098 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2099 param = &work->cm_event.param.rej_rcvd; 2100 param->ari = rej_msg->ari; 2101 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2102 param->reason = __be16_to_cpu(rej_msg->reason); 2103 work->cm_event.private_data = &rej_msg->private_data; 2104} 2105 2106static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2107{ 2108 struct cm_timewait_info *timewait_info; 2109 struct cm_id_private *cm_id_priv; 2110 unsigned long flags; 2111 __be32 remote_id; 2112 2113 remote_id = rej_msg->local_comm_id; 2114 2115 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2116 spin_lock_irqsave(&cm.lock, flags); 2117 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2118 remote_id); 2119 if (!timewait_info) { 2120 spin_unlock_irqrestore(&cm.lock, flags); 2121 return NULL; 2122 } 2123 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2124 (timewait_info->work.local_id ^ 2125 cm.random_id_operand)); 2126 if (cm_id_priv) { 2127 if (cm_id_priv->id.remote_id == remote_id) 2128 atomic_inc(&cm_id_priv->refcount); 2129 else 2130 cm_id_priv = NULL; 2131 } 2132 spin_unlock_irqrestore(&cm.lock, flags); 2133 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2134 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2135 else 2136 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2137 2138 return cm_id_priv; 2139} 2140 2141static int cm_rej_handler(struct cm_work *work) 2142{ 2143 struct cm_id_private *cm_id_priv; 2144 struct cm_rej_msg *rej_msg; 2145 unsigned long flags; 2146 int ret; 2147 2148 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2149 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2150 if (!cm_id_priv) 2151 return -EINVAL; 2152 2153 cm_format_rej_event(work); 2154 2155 spin_lock_irqsave(&cm_id_priv->lock, flags); 2156 switch (cm_id_priv->id.state) { 2157 case IB_CM_REQ_SENT: 2158 case IB_CM_MRA_REQ_RCVD: 2159 case IB_CM_REP_SENT: 2160 case IB_CM_MRA_REP_RCVD: 2161 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2162 /* fall through */ 2163 case IB_CM_REQ_RCVD: 2164 case IB_CM_MRA_REQ_SENT: 2165 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2166 cm_enter_timewait(cm_id_priv); 2167 else 2168 cm_reset_to_idle(cm_id_priv); 2169 break; 2170 case IB_CM_DREQ_SENT: 2171 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2172 /* fall through */ 2173 case IB_CM_REP_RCVD: 2174 case IB_CM_MRA_REP_SENT: 2175 case IB_CM_ESTABLISHED: 2176 cm_enter_timewait(cm_id_priv); 2177 break; 2178 default: 2179 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2180 ret = -EINVAL; 2181 goto out; 2182 } 2183 2184 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2185 if (!ret) 2186 list_add_tail(&work->list, &cm_id_priv->work_list); 2187 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2188 2189 if (ret) 2190 cm_process_work(cm_id_priv, work); 2191 else 2192 cm_deref_id(cm_id_priv); 2193 return 0; 2194out: 2195 cm_deref_id(cm_id_priv); 2196 return -EINVAL; 2197} 2198 2199int ib_send_cm_mra(struct ib_cm_id *cm_id, 2200 u8 service_timeout, 2201 const void *private_data, 2202 u8 private_data_len) 2203{ 2204 struct cm_id_private *cm_id_priv; 2205 struct ib_mad_send_buf *msg; 2206 void *data; 2207 unsigned long flags; 2208 int ret; 2209 2210 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2211 return -EINVAL; 2212 2213 data = cm_copy_private_data(private_data, private_data_len); 2214 if (IS_ERR(data)) 2215 return PTR_ERR(data); 2216 2217 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2218 2219 spin_lock_irqsave(&cm_id_priv->lock, flags); 2220 switch(cm_id_priv->id.state) { 2221 case IB_CM_REQ_RCVD: 2222 ret = cm_alloc_msg(cm_id_priv, &msg); 2223 if (ret) 2224 goto error1; 2225 2226 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2227 CM_MSG_RESPONSE_REQ, service_timeout, 2228 private_data, private_data_len); 2229 ret = ib_post_send_mad(msg, NULL); 2230 if (ret) 2231 goto error2; 2232 cm_id->state = IB_CM_MRA_REQ_SENT; 2233 break; 2234 case IB_CM_REP_RCVD: 2235 ret = cm_alloc_msg(cm_id_priv, &msg); 2236 if (ret) 2237 goto error1; 2238 2239 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2240 CM_MSG_RESPONSE_REP, service_timeout, 2241 private_data, private_data_len); 2242 ret = ib_post_send_mad(msg, NULL); 2243 if (ret) 2244 goto error2; 2245 cm_id->state = IB_CM_MRA_REP_SENT; 2246 break; 2247 case IB_CM_ESTABLISHED: 2248 ret = cm_alloc_msg(cm_id_priv, &msg); 2249 if (ret) 2250 goto error1; 2251 2252 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2253 CM_MSG_RESPONSE_OTHER, service_timeout, 2254 private_data, private_data_len); 2255 ret = ib_post_send_mad(msg, NULL); 2256 if (ret) 2257 goto error2; 2258 cm_id->lap_state = IB_CM_MRA_LAP_SENT; 2259 break; 2260 default: 2261 ret = -EINVAL; 2262 goto error1; 2263 } 2264 cm_id_priv->service_timeout = service_timeout; 2265 cm_set_private_data(cm_id_priv, data, private_data_len); 2266 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2267 return 0; 2268 2269error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2270 kfree(data); 2271 return ret; 2272 2273error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2274 kfree(data); 2275 cm_free_msg(msg); 2276 return ret; 2277} 2278EXPORT_SYMBOL(ib_send_cm_mra); 2279 2280static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2281{ 2282 switch (cm_mra_get_msg_mraed(mra_msg)) { 2283 case CM_MSG_RESPONSE_REQ: 2284 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2285 case CM_MSG_RESPONSE_REP: 2286 case CM_MSG_RESPONSE_OTHER: 2287 return cm_acquire_id(mra_msg->remote_comm_id, 2288 mra_msg->local_comm_id); 2289 default: 2290 return NULL; 2291 } 2292} 2293 2294static int cm_mra_handler(struct cm_work *work) 2295{ 2296 struct cm_id_private *cm_id_priv; 2297 struct cm_mra_msg *mra_msg; 2298 unsigned long flags; 2299 int timeout, ret; 2300 2301 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2302 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2303 if (!cm_id_priv) 2304 return -EINVAL; 2305 2306 work->cm_event.private_data = &mra_msg->private_data; 2307 work->cm_event.param.mra_rcvd.service_timeout = 2308 cm_mra_get_service_timeout(mra_msg); 2309 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2310 cm_convert_to_ms(cm_id_priv->av.packet_life_time); 2311 2312 spin_lock_irqsave(&cm_id_priv->lock, flags); 2313 switch (cm_id_priv->id.state) { 2314 case IB_CM_REQ_SENT: 2315 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2316 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2317 cm_id_priv->msg, timeout)) 2318 goto out; 2319 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2320 break; 2321 case IB_CM_REP_SENT: 2322 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2323 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2324 cm_id_priv->msg, timeout)) 2325 goto out; 2326 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2327 break; 2328 case IB_CM_ESTABLISHED: 2329 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2330 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2331 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2332 cm_id_priv->msg, timeout)) 2333 goto out; 2334 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2335 break; 2336 default: 2337 goto out; 2338 } 2339 2340 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2341 cm_id_priv->id.state; 2342 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2343 if (!ret) 2344 list_add_tail(&work->list, &cm_id_priv->work_list); 2345 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2346 2347 if (ret) 2348 cm_process_work(cm_id_priv, work); 2349 else 2350 cm_deref_id(cm_id_priv); 2351 return 0; 2352out: 2353 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2354 cm_deref_id(cm_id_priv); 2355 return -EINVAL; 2356} 2357 2358static void cm_format_lap(struct cm_lap_msg *lap_msg, 2359 struct cm_id_private *cm_id_priv, 2360 struct ib_sa_path_rec *alternate_path, 2361 const void *private_data, 2362 u8 private_data_len) 2363{ 2364 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2365 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2366 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2367 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2368 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2369 /* todo: need remote CM response timeout */ 2370 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2371 lap_msg->alt_local_lid = alternate_path->slid; 2372 lap_msg->alt_remote_lid = alternate_path->dlid; 2373 lap_msg->alt_local_gid = alternate_path->sgid; 2374 lap_msg->alt_remote_gid = alternate_path->dgid; 2375 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2376 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2377 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2378 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2379 cm_lap_set_sl(lap_msg, alternate_path->sl); 2380 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2381 cm_lap_set_local_ack_timeout(lap_msg, 2382 min(31, alternate_path->packet_life_time + 1)); 2383 2384 if (private_data && private_data_len) 2385 memcpy(lap_msg->private_data, private_data, private_data_len); 2386} 2387 2388int ib_send_cm_lap(struct ib_cm_id *cm_id, 2389 struct ib_sa_path_rec *alternate_path, 2390 const void *private_data, 2391 u8 private_data_len) 2392{ 2393 struct cm_id_private *cm_id_priv; 2394 struct ib_mad_send_buf *msg; 2395 unsigned long flags; 2396 int ret; 2397 2398 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2399 return -EINVAL; 2400 2401 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2402 spin_lock_irqsave(&cm_id_priv->lock, flags); 2403 if (cm_id->state != IB_CM_ESTABLISHED || 2404 cm_id->lap_state != IB_CM_LAP_IDLE) { 2405 ret = -EINVAL; 2406 goto out; 2407 } 2408 2409 ret = cm_alloc_msg(cm_id_priv, &msg); 2410 if (ret) 2411 goto out; 2412 2413 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2414 alternate_path, private_data, private_data_len); 2415 msg->timeout_ms = cm_id_priv->timeout_ms; 2416 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2417 2418 ret = ib_post_send_mad(msg, NULL); 2419 if (ret) { 2420 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2421 cm_free_msg(msg); 2422 return ret; 2423 } 2424 2425 cm_id->lap_state = IB_CM_LAP_SENT; 2426 cm_id_priv->msg = msg; 2427 2428out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2429 return ret; 2430} 2431EXPORT_SYMBOL(ib_send_cm_lap); 2432 2433static void cm_format_path_from_lap(struct ib_sa_path_rec *path, 2434 struct cm_lap_msg *lap_msg) 2435{ 2436 memset(path, 0, sizeof *path); 2437 path->dgid = lap_msg->alt_local_gid; 2438 path->sgid = lap_msg->alt_remote_gid; 2439 path->dlid = lap_msg->alt_local_lid; 2440 path->slid = lap_msg->alt_remote_lid; 2441 path->flow_label = cm_lap_get_flow_label(lap_msg); 2442 path->hop_limit = lap_msg->alt_hop_limit; 2443 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2444 path->reversible = 1; 2445 /* pkey is same as in REQ */ 2446 path->sl = cm_lap_get_sl(lap_msg); 2447 path->mtu_selector = IB_SA_EQ; 2448 /* mtu is same as in REQ */ 2449 path->rate_selector = IB_SA_EQ; 2450 path->rate = cm_lap_get_packet_rate(lap_msg); 2451 path->packet_life_time_selector = IB_SA_EQ; 2452 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2453 path->packet_life_time -= (path->packet_life_time > 0); 2454} 2455 2456static int cm_lap_handler(struct cm_work *work) 2457{ 2458 struct cm_id_private *cm_id_priv; 2459 struct cm_lap_msg *lap_msg; 2460 struct ib_cm_lap_event_param *param; 2461 struct ib_mad_send_buf *msg = NULL; 2462 unsigned long flags; 2463 int ret; 2464 2465 /* todo: verify LAP request and send reject APR if invalid. */ 2466 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2467 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2468 lap_msg->local_comm_id); 2469 if (!cm_id_priv) 2470 return -EINVAL; 2471 2472 param = &work->cm_event.param.lap_rcvd; 2473 param->alternate_path = &work->path[0]; 2474 cm_format_path_from_lap(param->alternate_path, lap_msg); 2475 work->cm_event.private_data = &lap_msg->private_data; 2476 2477 spin_lock_irqsave(&cm_id_priv->lock, flags); 2478 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2479 goto unlock; 2480 2481 switch (cm_id_priv->id.lap_state) { 2482 case IB_CM_LAP_IDLE: 2483 break; 2484 case IB_CM_MRA_LAP_SENT: 2485 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2486 goto unlock; 2487 2488 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2489 CM_MSG_RESPONSE_OTHER, 2490 cm_id_priv->service_timeout, 2491 cm_id_priv->private_data, 2492 cm_id_priv->private_data_len); 2493 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2494 2495 if (ib_post_send_mad(msg, NULL)) 2496 cm_free_msg(msg); 2497 goto deref; 2498 default: 2499 goto unlock; 2500 } 2501 2502 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2503 cm_id_priv->tid = lap_msg->hdr.tid; 2504 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2505 if (!ret) 2506 list_add_tail(&work->list, &cm_id_priv->work_list); 2507 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2508 2509 if (ret) 2510 cm_process_work(cm_id_priv, work); 2511 else 2512 cm_deref_id(cm_id_priv); 2513 return 0; 2514 2515unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2516deref: cm_deref_id(cm_id_priv); 2517 return -EINVAL; 2518} 2519 2520static void cm_format_apr(struct cm_apr_msg *apr_msg, 2521 struct cm_id_private *cm_id_priv, 2522 enum ib_cm_apr_status status, 2523 void *info, 2524 u8 info_length, 2525 const void *private_data, 2526 u8 private_data_len) 2527{ 2528 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2529 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2530 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2531 apr_msg->ap_status = (u8) status; 2532 2533 if (info && info_length) { 2534 apr_msg->info_length = info_length; 2535 memcpy(apr_msg->info, info, info_length); 2536 } 2537 2538 if (private_data && private_data_len) 2539 memcpy(apr_msg->private_data, private_data, private_data_len); 2540} 2541 2542int ib_send_cm_apr(struct ib_cm_id *cm_id, 2543 enum ib_cm_apr_status status, 2544 void *info, 2545 u8 info_length, 2546 const void *private_data, 2547 u8 private_data_len) 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 ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2555 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2556 return -EINVAL; 2557 2558 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2559 spin_lock_irqsave(&cm_id_priv->lock, flags); 2560 if (cm_id->state != IB_CM_ESTABLISHED || 2561 (cm_id->lap_state != IB_CM_LAP_RCVD && 2562 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2563 ret = -EINVAL; 2564 goto out; 2565 } 2566 2567 ret = cm_alloc_msg(cm_id_priv, &msg); 2568 if (ret) 2569 goto out; 2570 2571 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2572 info, info_length, private_data, private_data_len); 2573 ret = ib_post_send_mad(msg, NULL); 2574 if (ret) { 2575 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2576 cm_free_msg(msg); 2577 return ret; 2578 } 2579 2580 cm_id->lap_state = IB_CM_LAP_IDLE; 2581out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2582 return ret; 2583} 2584EXPORT_SYMBOL(ib_send_cm_apr); 2585 2586static int cm_apr_handler(struct cm_work *work) 2587{ 2588 struct cm_id_private *cm_id_priv; 2589 struct cm_apr_msg *apr_msg; 2590 unsigned long flags; 2591 int ret; 2592 2593 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2594 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2595 apr_msg->local_comm_id); 2596 if (!cm_id_priv) 2597 return -EINVAL; /* Unmatched reply. */ 2598 2599 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2600 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2601 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2602 work->cm_event.private_data = &apr_msg->private_data; 2603 2604 spin_lock_irqsave(&cm_id_priv->lock, flags); 2605 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2606 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2607 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2608 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2609 goto out; 2610 } 2611 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2612 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2613 cm_id_priv->msg = NULL; 2614 2615 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2616 if (!ret) 2617 list_add_tail(&work->list, &cm_id_priv->work_list); 2618 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2619 2620 if (ret) 2621 cm_process_work(cm_id_priv, work); 2622 else 2623 cm_deref_id(cm_id_priv); 2624 return 0; 2625out: 2626 cm_deref_id(cm_id_priv); 2627 return -EINVAL; 2628} 2629 2630static int cm_timewait_handler(struct cm_work *work) 2631{ 2632 struct cm_timewait_info *timewait_info; 2633 struct cm_id_private *cm_id_priv; 2634 int ret; 2635 2636 timewait_info = (struct cm_timewait_info *)work; 2637 spin_lock_irq(&cm.lock); 2638 list_del(&timewait_info->list); 2639 spin_unlock_irq(&cm.lock); 2640 2641 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2642 timewait_info->work.remote_id); 2643 if (!cm_id_priv) 2644 return -EINVAL; 2645 2646 spin_lock_irq(&cm_id_priv->lock); 2647 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2648 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2649 spin_unlock_irq(&cm_id_priv->lock); 2650 goto out; 2651 } 2652 cm_id_priv->id.state = IB_CM_IDLE; 2653 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2654 if (!ret) 2655 list_add_tail(&work->list, &cm_id_priv->work_list); 2656 spin_unlock_irq(&cm_id_priv->lock); 2657 2658 if (ret) 2659 cm_process_work(cm_id_priv, work); 2660 else 2661 cm_deref_id(cm_id_priv); 2662 return 0; 2663out: 2664 cm_deref_id(cm_id_priv); 2665 return -EINVAL; 2666} 2667 2668static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2669 struct cm_id_private *cm_id_priv, 2670 struct ib_cm_sidr_req_param *param) 2671{ 2672 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2673 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2674 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2675 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey); 2676 sidr_req_msg->service_id = param->service_id; 2677 2678 if (param->private_data && param->private_data_len) 2679 memcpy(sidr_req_msg->private_data, param->private_data, 2680 param->private_data_len); 2681} 2682 2683int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2684 struct ib_cm_sidr_req_param *param) 2685{ 2686 struct cm_id_private *cm_id_priv; 2687 struct ib_mad_send_buf *msg; 2688 unsigned long flags; 2689 int ret; 2690 2691 if (!param->path || (param->private_data && 2692 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2693 return -EINVAL; 2694 2695 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2696 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2697 if (ret) 2698 goto out; 2699 2700 cm_id->service_id = param->service_id; 2701 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2702 cm_id_priv->timeout_ms = param->timeout_ms; 2703 cm_id_priv->max_cm_retries = param->max_cm_retries; 2704 ret = cm_alloc_msg(cm_id_priv, &msg); 2705 if (ret) 2706 goto out; 2707 2708 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2709 param); 2710 msg->timeout_ms = cm_id_priv->timeout_ms; 2711 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2712 2713 spin_lock_irqsave(&cm_id_priv->lock, flags); 2714 if (cm_id->state == IB_CM_IDLE) 2715 ret = ib_post_send_mad(msg, NULL); 2716 else 2717 ret = -EINVAL; 2718 2719 if (ret) { 2720 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2721 cm_free_msg(msg); 2722 goto out; 2723 } 2724 cm_id->state = IB_CM_SIDR_REQ_SENT; 2725 cm_id_priv->msg = msg; 2726 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2727out: 2728 return ret; 2729} 2730EXPORT_SYMBOL(ib_send_cm_sidr_req); 2731 2732static void cm_format_sidr_req_event(struct cm_work *work, 2733 struct ib_cm_id *listen_id) 2734{ 2735 struct cm_sidr_req_msg *sidr_req_msg; 2736 struct ib_cm_sidr_req_event_param *param; 2737 2738 sidr_req_msg = (struct cm_sidr_req_msg *) 2739 work->mad_recv_wc->recv_buf.mad; 2740 param = &work->cm_event.param.sidr_req_rcvd; 2741 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2742 param->listen_id = listen_id; 2743 param->port = work->port->port_num; 2744 work->cm_event.private_data = &sidr_req_msg->private_data; 2745} 2746 2747static int cm_sidr_req_handler(struct cm_work *work) 2748{ 2749 struct ib_cm_id *cm_id; 2750 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2751 struct cm_sidr_req_msg *sidr_req_msg; 2752 struct ib_wc *wc; 2753 unsigned long flags; 2754 2755 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2756 if (IS_ERR(cm_id)) 2757 return PTR_ERR(cm_id); 2758 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2759 2760 /* Record SGID/SLID and request ID for lookup. */ 2761 sidr_req_msg = (struct cm_sidr_req_msg *) 2762 work->mad_recv_wc->recv_buf.mad; 2763 wc = work->mad_recv_wc->wc; 2764 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2765 cm_id_priv->av.dgid.global.interface_id = 0; 2766 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2767 work->mad_recv_wc->recv_buf.grh, 2768 &cm_id_priv->av); 2769 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2770 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2771 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2772 atomic_inc(&cm_id_priv->work_count); 2773 2774 spin_lock_irqsave(&cm.lock, flags); 2775 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2776 if (cur_cm_id_priv) { 2777 spin_unlock_irqrestore(&cm.lock, flags); 2778 goto out; /* Duplicate message. */ 2779 } 2780 cur_cm_id_priv = cm_find_listen(cm_id->device, 2781 sidr_req_msg->service_id, 2782 sidr_req_msg->private_data); 2783 if (!cur_cm_id_priv) { 2784 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2785 spin_unlock_irqrestore(&cm.lock, flags); 2786 /* todo: reply with no match */ 2787 goto out; /* No match. */ 2788 } 2789 atomic_inc(&cur_cm_id_priv->refcount); 2790 spin_unlock_irqrestore(&cm.lock, flags); 2791 2792 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2793 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2794 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2795 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2796 2797 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2798 cm_process_work(cm_id_priv, work); 2799 cm_deref_id(cur_cm_id_priv); 2800 return 0; 2801out: 2802 ib_destroy_cm_id(&cm_id_priv->id); 2803 return -EINVAL; 2804} 2805 2806static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2807 struct cm_id_private *cm_id_priv, 2808 struct ib_cm_sidr_rep_param *param) 2809{ 2810 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2811 cm_id_priv->tid); 2812 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2813 sidr_rep_msg->status = param->status; 2814 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2815 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2816 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2817 2818 if (param->info && param->info_length) 2819 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2820 2821 if (param->private_data && param->private_data_len) 2822 memcpy(sidr_rep_msg->private_data, param->private_data, 2823 param->private_data_len); 2824} 2825 2826int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2827 struct ib_cm_sidr_rep_param *param) 2828{ 2829 struct cm_id_private *cm_id_priv; 2830 struct ib_mad_send_buf *msg; 2831 unsigned long flags; 2832 int ret; 2833 2834 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2835 (param->private_data && 2836 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2837 return -EINVAL; 2838 2839 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2840 spin_lock_irqsave(&cm_id_priv->lock, flags); 2841 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2842 ret = -EINVAL; 2843 goto error; 2844 } 2845 2846 ret = cm_alloc_msg(cm_id_priv, &msg); 2847 if (ret) 2848 goto error; 2849 2850 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2851 param); 2852 ret = ib_post_send_mad(msg, NULL); 2853 if (ret) { 2854 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2855 cm_free_msg(msg); 2856 return ret; 2857 } 2858 cm_id->state = IB_CM_IDLE; 2859 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2860 2861 spin_lock_irqsave(&cm.lock, flags); 2862 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2863 spin_unlock_irqrestore(&cm.lock, flags); 2864 return 0; 2865 2866error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2867 return ret; 2868} 2869EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2870 2871static void cm_format_sidr_rep_event(struct cm_work *work) 2872{ 2873 struct cm_sidr_rep_msg *sidr_rep_msg; 2874 struct ib_cm_sidr_rep_event_param *param; 2875 2876 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2877 work->mad_recv_wc->recv_buf.mad; 2878 param = &work->cm_event.param.sidr_rep_rcvd; 2879 param->status = sidr_rep_msg->status; 2880 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2881 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2882 param->info = &sidr_rep_msg->info; 2883 param->info_len = sidr_rep_msg->info_length; 2884 work->cm_event.private_data = &sidr_rep_msg->private_data; 2885} 2886 2887static int cm_sidr_rep_handler(struct cm_work *work) 2888{ 2889 struct cm_sidr_rep_msg *sidr_rep_msg; 2890 struct cm_id_private *cm_id_priv; 2891 unsigned long flags; 2892 2893 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2894 work->mad_recv_wc->recv_buf.mad; 2895 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2896 if (!cm_id_priv) 2897 return -EINVAL; /* Unmatched reply. */ 2898 2899 spin_lock_irqsave(&cm_id_priv->lock, flags); 2900 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2901 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2902 goto out; 2903 } 2904 cm_id_priv->id.state = IB_CM_IDLE; 2905 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2906 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2907 2908 cm_format_sidr_rep_event(work); 2909 cm_process_work(cm_id_priv, work); 2910 return 0; 2911out: 2912 cm_deref_id(cm_id_priv); 2913 return -EINVAL; 2914} 2915 2916static void cm_process_send_error(struct ib_mad_send_buf *msg, 2917 enum ib_wc_status wc_status) 2918{ 2919 struct cm_id_private *cm_id_priv; 2920 struct ib_cm_event cm_event; 2921 enum ib_cm_state state; 2922 unsigned long flags; 2923 int ret; 2924 2925 memset(&cm_event, 0, sizeof cm_event); 2926 cm_id_priv = msg->context[0]; 2927 2928 /* Discard old sends or ones without a response. */ 2929 spin_lock_irqsave(&cm_id_priv->lock, flags); 2930 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2931 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2932 goto discard; 2933 2934 switch (state) { 2935 case IB_CM_REQ_SENT: 2936 case IB_CM_MRA_REQ_RCVD: 2937 cm_reset_to_idle(cm_id_priv); 2938 cm_event.event = IB_CM_REQ_ERROR; 2939 break; 2940 case IB_CM_REP_SENT: 2941 case IB_CM_MRA_REP_RCVD: 2942 cm_reset_to_idle(cm_id_priv); 2943 cm_event.event = IB_CM_REP_ERROR; 2944 break; 2945 case IB_CM_DREQ_SENT: 2946 cm_enter_timewait(cm_id_priv); 2947 cm_event.event = IB_CM_DREQ_ERROR; 2948 break; 2949 case IB_CM_SIDR_REQ_SENT: 2950 cm_id_priv->id.state = IB_CM_IDLE; 2951 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2952 break; 2953 default: 2954 goto discard; 2955 } 2956 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2957 cm_event.param.send_status = wc_status; 2958 2959 /* No other events can occur on the cm_id at this point. */ 2960 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2961 cm_free_msg(msg); 2962 if (ret) 2963 ib_destroy_cm_id(&cm_id_priv->id); 2964 return; 2965discard: 2966 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2967 cm_free_msg(msg); 2968} 2969 2970static void cm_send_handler(struct ib_mad_agent *mad_agent, 2971 struct ib_mad_send_wc *mad_send_wc) 2972{ 2973 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 2974 2975 switch (mad_send_wc->status) { 2976 case IB_WC_SUCCESS: 2977 case IB_WC_WR_FLUSH_ERR: 2978 cm_free_msg(msg); 2979 break; 2980 default: 2981 if (msg->context[0] && msg->context[1]) 2982 cm_process_send_error(msg, mad_send_wc->status); 2983 else 2984 cm_free_msg(msg); 2985 break; 2986 } 2987} 2988 2989static void cm_work_handler(struct work_struct *_work) 2990{ 2991 struct cm_work *work = container_of(_work, struct cm_work, work.work); 2992 int ret; 2993 2994 switch (work->cm_event.event) { 2995 case IB_CM_REQ_RECEIVED: 2996 ret = cm_req_handler(work); 2997 break; 2998 case IB_CM_MRA_RECEIVED: 2999 ret = cm_mra_handler(work); 3000 break; 3001 case IB_CM_REJ_RECEIVED: 3002 ret = cm_rej_handler(work); 3003 break; 3004 case IB_CM_REP_RECEIVED: 3005 ret = cm_rep_handler(work); 3006 break; 3007 case IB_CM_RTU_RECEIVED: 3008 ret = cm_rtu_handler(work); 3009 break; 3010 case IB_CM_USER_ESTABLISHED: 3011 ret = cm_establish_handler(work); 3012 break; 3013 case IB_CM_DREQ_RECEIVED: 3014 ret = cm_dreq_handler(work); 3015 break; 3016 case IB_CM_DREP_RECEIVED: 3017 ret = cm_drep_handler(work); 3018 break; 3019 case IB_CM_SIDR_REQ_RECEIVED: 3020 ret = cm_sidr_req_handler(work); 3021 break; 3022 case IB_CM_SIDR_REP_RECEIVED: 3023 ret = cm_sidr_rep_handler(work); 3024 break; 3025 case IB_CM_LAP_RECEIVED: 3026 ret = cm_lap_handler(work); 3027 break; 3028 case IB_CM_APR_RECEIVED: 3029 ret = cm_apr_handler(work); 3030 break; 3031 case IB_CM_TIMEWAIT_EXIT: 3032 ret = cm_timewait_handler(work); 3033 break; 3034 default: 3035 ret = -EINVAL; 3036 break; 3037 } 3038 if (ret) 3039 cm_free_work(work); 3040} 3041 3042int ib_cm_establish(struct ib_cm_id *cm_id) 3043{ 3044 struct cm_id_private *cm_id_priv; 3045 struct cm_work *work; 3046 unsigned long flags; 3047 int ret = 0; 3048 3049 work = kmalloc(sizeof *work, GFP_ATOMIC); 3050 if (!work) 3051 return -ENOMEM; 3052 3053 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3054 spin_lock_irqsave(&cm_id_priv->lock, flags); 3055 switch (cm_id->state) 3056 { 3057 case IB_CM_REP_SENT: 3058 case IB_CM_MRA_REP_RCVD: 3059 cm_id->state = IB_CM_ESTABLISHED; 3060 break; 3061 case IB_CM_ESTABLISHED: 3062 ret = -EISCONN; 3063 break; 3064 default: 3065 ret = -EINVAL; 3066 break; 3067 } 3068 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3069 3070 if (ret) { 3071 kfree(work); 3072 goto out; 3073 } 3074 3075 /* 3076 * The CM worker thread may try to destroy the cm_id before it 3077 * can execute this work item. To prevent potential deadlock, 3078 * we need to find the cm_id once we're in the context of the 3079 * worker thread, rather than holding a reference on it. 3080 */ 3081 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3082 work->local_id = cm_id->local_id; 3083 work->remote_id = cm_id->remote_id; 3084 work->mad_recv_wc = NULL; 3085 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3086 queue_delayed_work(cm.wq, &work->work, 0); 3087out: 3088 return ret; 3089} 3090EXPORT_SYMBOL(ib_cm_establish); 3091 3092static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3093 struct ib_mad_recv_wc *mad_recv_wc) 3094{ 3095 struct cm_work *work; 3096 enum ib_cm_event_type event; 3097 int paths = 0; 3098 3099 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3100 case CM_REQ_ATTR_ID: 3101 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3102 alt_local_lid != 0); 3103 event = IB_CM_REQ_RECEIVED; 3104 break; 3105 case CM_MRA_ATTR_ID: 3106 event = IB_CM_MRA_RECEIVED; 3107 break; 3108 case CM_REJ_ATTR_ID: 3109 event = IB_CM_REJ_RECEIVED; 3110 break; 3111 case CM_REP_ATTR_ID: 3112 event = IB_CM_REP_RECEIVED; 3113 break; 3114 case CM_RTU_ATTR_ID: 3115 event = IB_CM_RTU_RECEIVED; 3116 break; 3117 case CM_DREQ_ATTR_ID: 3118 event = IB_CM_DREQ_RECEIVED; 3119 break; 3120 case CM_DREP_ATTR_ID: 3121 event = IB_CM_DREP_RECEIVED; 3122 break; 3123 case CM_SIDR_REQ_ATTR_ID: 3124 event = IB_CM_SIDR_REQ_RECEIVED; 3125 break; 3126 case CM_SIDR_REP_ATTR_ID: 3127 event = IB_CM_SIDR_REP_RECEIVED; 3128 break; 3129 case CM_LAP_ATTR_ID: 3130 paths = 1; 3131 event = IB_CM_LAP_RECEIVED; 3132 break; 3133 case CM_APR_ATTR_ID: 3134 event = IB_CM_APR_RECEIVED; 3135 break; 3136 default: 3137 ib_free_recv_mad(mad_recv_wc); 3138 return; 3139 } 3140 3141 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3142 GFP_KERNEL); 3143 if (!work) { 3144 ib_free_recv_mad(mad_recv_wc); 3145 return; 3146 } 3147 3148 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3149 work->cm_event.event = event; 3150 work->mad_recv_wc = mad_recv_wc; 3151 work->port = (struct cm_port *)mad_agent->context; 3152 queue_delayed_work(cm.wq, &work->work, 0); 3153} 3154 3155static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3156 struct ib_qp_attr *qp_attr, 3157 int *qp_attr_mask) 3158{ 3159 unsigned long flags; 3160 int ret; 3161 3162 spin_lock_irqsave(&cm_id_priv->lock, flags); 3163 switch (cm_id_priv->id.state) { 3164 case IB_CM_REQ_SENT: 3165 case IB_CM_MRA_REQ_RCVD: 3166 case IB_CM_REQ_RCVD: 3167 case IB_CM_MRA_REQ_SENT: 3168 case IB_CM_REP_RCVD: 3169 case IB_CM_MRA_REP_SENT: 3170 case IB_CM_REP_SENT: 3171 case IB_CM_MRA_REP_RCVD: 3172 case IB_CM_ESTABLISHED: 3173 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3174 IB_QP_PKEY_INDEX | IB_QP_PORT; 3175 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | 3176 IB_ACCESS_REMOTE_WRITE; 3177 if (cm_id_priv->responder_resources) 3178 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3179 IB_ACCESS_REMOTE_ATOMIC; 3180 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3181 qp_attr->port_num = cm_id_priv->av.port->port_num; 3182 ret = 0; 3183 break; 3184 default: 3185 ret = -EINVAL; 3186 break; 3187 } 3188 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3189 return ret; 3190} 3191 3192static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3193 struct ib_qp_attr *qp_attr, 3194 int *qp_attr_mask) 3195{ 3196 unsigned long flags; 3197 int ret; 3198 3199 spin_lock_irqsave(&cm_id_priv->lock, flags); 3200 switch (cm_id_priv->id.state) { 3201 case IB_CM_REQ_RCVD: 3202 case IB_CM_MRA_REQ_SENT: 3203 case IB_CM_REP_RCVD: 3204 case IB_CM_MRA_REP_SENT: 3205 case IB_CM_REP_SENT: 3206 case IB_CM_MRA_REP_RCVD: 3207 case IB_CM_ESTABLISHED: 3208 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3209 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3210 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3211 qp_attr->path_mtu = cm_id_priv->path_mtu; 3212 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3213 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3214 if (cm_id_priv->qp_type == IB_QPT_RC) { 3215 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3216 IB_QP_MIN_RNR_TIMER; 3217 qp_attr->max_dest_rd_atomic = 3218 cm_id_priv->responder_resources; 3219 qp_attr->min_rnr_timer = 0; 3220 } 3221 if (cm_id_priv->alt_av.ah_attr.dlid) { 3222 *qp_attr_mask |= IB_QP_ALT_PATH; 3223 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3224 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3225 } 3226 ret = 0; 3227 break; 3228 default: 3229 ret = -EINVAL; 3230 break; 3231 } 3232 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3233 return ret; 3234} 3235 3236static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3237 struct ib_qp_attr *qp_attr, 3238 int *qp_attr_mask) 3239{ 3240 unsigned long flags; 3241 int ret; 3242 3243 spin_lock_irqsave(&cm_id_priv->lock, flags); 3244 switch (cm_id_priv->id.state) { 3245 case IB_CM_REP_RCVD: 3246 case IB_CM_MRA_REP_SENT: 3247 case IB_CM_REP_SENT: 3248 case IB_CM_MRA_REP_RCVD: 3249 case IB_CM_ESTABLISHED: 3250 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3251 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3252 if (cm_id_priv->qp_type == IB_QPT_RC) { 3253 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3254 IB_QP_RNR_RETRY | 3255 IB_QP_MAX_QP_RD_ATOMIC; 3256 qp_attr->timeout = cm_id_priv->local_ack_timeout; 3257 qp_attr->retry_cnt = cm_id_priv->retry_count; 3258 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3259 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3260 } 3261 if (cm_id_priv->alt_av.ah_attr.dlid) { 3262 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3263 qp_attr->path_mig_state = IB_MIG_REARM; 3264 } 3265 ret = 0; 3266 break; 3267 default: 3268 ret = -EINVAL; 3269 break; 3270 } 3271 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3272 return ret; 3273} 3274 3275int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3276 struct ib_qp_attr *qp_attr, 3277 int *qp_attr_mask) 3278{ 3279 struct cm_id_private *cm_id_priv; 3280 int ret; 3281 3282 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3283 switch (qp_attr->qp_state) { 3284 case IB_QPS_INIT: 3285 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3286 break; 3287 case IB_QPS_RTR: 3288 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3289 break; 3290 case IB_QPS_RTS: 3291 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3292 break; 3293 default: 3294 ret = -EINVAL; 3295 break; 3296 } 3297 return ret; 3298} 3299EXPORT_SYMBOL(ib_cm_init_qp_attr); 3300 3301static void cm_add_one(struct ib_device *device) 3302{ 3303 struct cm_device *cm_dev; 3304 struct cm_port *port; 3305 struct ib_mad_reg_req reg_req = { 3306 .mgmt_class = IB_MGMT_CLASS_CM, 3307 .mgmt_class_version = IB_CM_CLASS_VERSION 3308 }; 3309 struct ib_port_modify port_modify = { 3310 .set_port_cap_mask = IB_PORT_CM_SUP 3311 }; 3312 unsigned long flags; 3313 int ret; 3314 u8 i; 3315 3316 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3317 return; 3318 3319 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3320 device->phys_port_cnt, GFP_KERNEL); 3321 if (!cm_dev) 3322 return; 3323 3324 cm_dev->device = device; 3325 cm_dev->ca_guid = device->node_guid; 3326 3327 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3328 for (i = 1; i <= device->phys_port_cnt; i++) { 3329 port = &cm_dev->port[i-1]; 3330 port->cm_dev = cm_dev; 3331 port->port_num = i; 3332 port->mad_agent = ib_register_mad_agent(device, i, 3333 IB_QPT_GSI, 3334 ®_req, 3335 0, 3336 cm_send_handler, 3337 cm_recv_handler, 3338 port); 3339 if (IS_ERR(port->mad_agent)) 3340 goto error1; 3341 3342 ret = ib_modify_port(device, i, 0, &port_modify); 3343 if (ret) 3344 goto error2; 3345 } 3346 ib_set_client_data(device, &cm_client, cm_dev); 3347 3348 write_lock_irqsave(&cm.device_lock, flags); 3349 list_add_tail(&cm_dev->list, &cm.device_list); 3350 write_unlock_irqrestore(&cm.device_lock, flags); 3351 return; 3352 3353error2: 3354 ib_unregister_mad_agent(port->mad_agent); 3355error1: 3356 port_modify.set_port_cap_mask = 0; 3357 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3358 while (--i) { 3359 port = &cm_dev->port[i-1]; 3360 ib_modify_port(device, port->port_num, 0, &port_modify); 3361 ib_unregister_mad_agent(port->mad_agent); 3362 } 3363 kfree(cm_dev); 3364} 3365 3366static void cm_remove_one(struct ib_device *device) 3367{ 3368 struct cm_device *cm_dev; 3369 struct cm_port *port; 3370 struct ib_port_modify port_modify = { 3371 .clr_port_cap_mask = IB_PORT_CM_SUP 3372 }; 3373 unsigned long flags; 3374 int i; 3375 3376 cm_dev = ib_get_client_data(device, &cm_client); 3377 if (!cm_dev) 3378 return; 3379 3380 write_lock_irqsave(&cm.device_lock, flags); 3381 list_del(&cm_dev->list); 3382 write_unlock_irqrestore(&cm.device_lock, flags); 3383 3384 for (i = 1; i <= device->phys_port_cnt; i++) { 3385 port = &cm_dev->port[i-1]; 3386 ib_modify_port(device, port->port_num, 0, &port_modify); 3387 ib_unregister_mad_agent(port->mad_agent); 3388 } 3389 kfree(cm_dev); 3390} 3391 3392static int __init ib_cm_init(void) 3393{ 3394 int ret; 3395 3396 memset(&cm, 0, sizeof cm); 3397 INIT_LIST_HEAD(&cm.device_list); 3398 rwlock_init(&cm.device_lock); 3399 spin_lock_init(&cm.lock); 3400 cm.listen_service_table = RB_ROOT; 3401 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3402 cm.remote_id_table = RB_ROOT; 3403 cm.remote_qp_table = RB_ROOT; 3404 cm.remote_sidr_table = RB_ROOT; 3405 idr_init(&cm.local_id_table); 3406 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3407 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3408 INIT_LIST_HEAD(&cm.timewait_list); 3409 3410 cm.wq = create_workqueue("ib_cm"); 3411 if (!cm.wq) 3412 return -ENOMEM; 3413 3414 ret = ib_register_client(&cm_client); 3415 if (ret) 3416 goto error; 3417 3418 return 0; 3419error: 3420 destroy_workqueue(cm.wq); 3421 return ret; 3422} 3423 3424static void __exit ib_cm_cleanup(void) 3425{ 3426 struct cm_timewait_info *timewait_info, *tmp; 3427 3428 spin_lock_irq(&cm.lock); 3429 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3430 cancel_delayed_work(&timewait_info->work.work); 3431 spin_unlock_irq(&cm.lock); 3432 3433 destroy_workqueue(cm.wq); 3434 3435 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3436 list_del(&timewait_info->list); 3437 kfree(timewait_info); 3438 } 3439 3440 ib_unregister_client(&cm_client); 3441 idr_destroy(&cm.local_id_table); 3442} 3443 3444module_init(ib_cm_init); 3445module_exit(ib_cm_cleanup); 3446 3447