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/random.h> 44 #include <linux/rbtree.h> 45 #include <linux/spinlock.h> 46 #include <linux/workqueue.h> 47 48 #include <rdma/ib_cache.h> 49 #include <rdma/ib_cm.h> 50 #include "cm_msgs.h" 51 52 MODULE_AUTHOR("Sean Hefty"); 53 MODULE_DESCRIPTION("InfiniBand CM"); 54 MODULE_LICENSE("Dual BSD/GPL"); 55 56 static void cm_add_one(struct ib_device *device); 57 static void cm_remove_one(struct ib_device *device); 58 59 static struct ib_client cm_client = { 60 .name = "cm", 61 .add = cm_add_one, 62 .remove = cm_remove_one 63 }; 64 65 static struct ib_cm { 66 spinlock_t lock; 67 struct list_head device_list; 68 rwlock_t device_lock; 69 struct rb_root listen_service_table; 70 u64 listen_service_id; 71 /* struct rb_root peer_service_table; todo: fix peer to peer */ 72 struct rb_root remote_qp_table; 73 struct rb_root remote_id_table; 74 struct rb_root remote_sidr_table; 75 struct idr local_id_table; 76 __be32 random_id_operand; 77 struct list_head timewait_list; 78 struct workqueue_struct *wq; 79 } cm; 80 81 struct cm_port { 82 struct cm_device *cm_dev; 83 struct ib_mad_agent *mad_agent; 84 u8 port_num; 85 }; 86 87 struct cm_device { 88 struct list_head list; 89 struct ib_device *device; 90 u8 ack_delay; 91 struct cm_port port[0]; 92 }; 93 94 struct cm_av { 95 struct cm_port *port; 96 union ib_gid dgid; 97 struct ib_ah_attr ah_attr; 98 u16 pkey_index; 99 u8 timeout; 100 }; 101 102 struct cm_work { 103 struct delayed_work work; 104 struct list_head list; 105 struct cm_port *port; 106 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 107 __be32 local_id; /* Established / timewait */ 108 __be32 remote_id; 109 struct ib_cm_event cm_event; 110 struct ib_sa_path_rec path[0]; 111 }; 112 113 struct cm_timewait_info { 114 struct cm_work work; /* Must be first. */ 115 struct list_head list; 116 struct rb_node remote_qp_node; 117 struct rb_node remote_id_node; 118 __be64 remote_ca_guid; 119 __be32 remote_qpn; 120 u8 inserted_remote_qp; 121 u8 inserted_remote_id; 122 }; 123 124 struct cm_id_private { 125 struct ib_cm_id id; 126 127 struct rb_node service_node; 128 struct rb_node sidr_id_node; 129 spinlock_t lock; /* Do not acquire inside cm.lock */ 130 struct completion comp; 131 atomic_t refcount; 132 133 struct ib_mad_send_buf *msg; 134 struct cm_timewait_info *timewait_info; 135 /* todo: use alternate port on send failure */ 136 struct cm_av av; 137 struct cm_av alt_av; 138 struct ib_cm_compare_data *compare_data; 139 140 void *private_data; 141 __be64 tid; 142 __be32 local_qpn; 143 __be32 remote_qpn; 144 enum ib_qp_type qp_type; 145 __be32 sq_psn; 146 __be32 rq_psn; 147 int timeout_ms; 148 enum ib_mtu path_mtu; 149 __be16 pkey; 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 retry_count; 156 u8 rnr_retry_count; 157 u8 service_timeout; 158 u8 target_ack_delay; 159 160 struct list_head work_list; 161 atomic_t work_count; 162 }; 163 164 static void cm_work_handler(struct work_struct *work); 165 166 static 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 } 171 172 static 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 } 202 203 static 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 } 226 227 static 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 } 234 235 static 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 = kmemdup(private_data, private_data_len, GFP_KERNEL); 244 if (!data) 245 return ERR_PTR(-ENOMEM); 246 247 return data; 248 } 249 250 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 251 void *private_data, u8 private_data_len) 252 { 253 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 254 kfree(cm_id_priv->private_data); 255 256 cm_id_priv->private_data = private_data; 257 cm_id_priv->private_data_len = private_data_len; 258 } 259 260 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 261 struct ib_grh *grh, struct cm_av *av) 262 { 263 av->port = port; 264 av->pkey_index = wc->pkey_index; 265 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc, 266 grh, &av->ah_attr); 267 } 268 269 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 270 { 271 struct cm_device *cm_dev; 272 struct cm_port *port = NULL; 273 unsigned long flags; 274 int ret; 275 u8 p; 276 277 read_lock_irqsave(&cm.device_lock, flags); 278 list_for_each_entry(cm_dev, &cm.device_list, list) { 279 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 280 &p, NULL)) { 281 port = &cm_dev->port[p-1]; 282 break; 283 } 284 } 285 read_unlock_irqrestore(&cm.device_lock, flags); 286 287 if (!port) 288 return -EINVAL; 289 290 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 291 be16_to_cpu(path->pkey), &av->pkey_index); 292 if (ret) 293 return ret; 294 295 av->port = port; 296 ib_init_ah_from_path(cm_dev->device, port->port_num, path, 297 &av->ah_attr); 298 av->timeout = path->packet_life_time + 1; 299 return 0; 300 } 301 302 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 303 { 304 unsigned long flags; 305 int ret, id; 306 static int next_id; 307 308 do { 309 spin_lock_irqsave(&cm.lock, flags); 310 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 311 next_id, &id); 312 if (!ret) 313 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 314 spin_unlock_irqrestore(&cm.lock, flags); 315 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 316 317 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand); 318 return ret; 319 } 320 321 static void cm_free_id(__be32 local_id) 322 { 323 spin_lock_irq(&cm.lock); 324 idr_remove(&cm.local_id_table, 325 (__force int) (local_id ^ cm.random_id_operand)); 326 spin_unlock_irq(&cm.lock); 327 } 328 329 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 330 { 331 struct cm_id_private *cm_id_priv; 332 333 cm_id_priv = idr_find(&cm.local_id_table, 334 (__force int) (local_id ^ cm.random_id_operand)); 335 if (cm_id_priv) { 336 if (cm_id_priv->id.remote_id == remote_id) 337 atomic_inc(&cm_id_priv->refcount); 338 else 339 cm_id_priv = NULL; 340 } 341 342 return cm_id_priv; 343 } 344 345 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 346 { 347 struct cm_id_private *cm_id_priv; 348 349 spin_lock_irq(&cm.lock); 350 cm_id_priv = cm_get_id(local_id, remote_id); 351 spin_unlock_irq(&cm.lock); 352 353 return cm_id_priv; 354 } 355 356 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 357 { 358 int i; 359 360 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 361 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 362 ((unsigned long *) mask)[i]; 363 } 364 365 static int cm_compare_data(struct ib_cm_compare_data *src_data, 366 struct ib_cm_compare_data *dst_data) 367 { 368 u8 src[IB_CM_COMPARE_SIZE]; 369 u8 dst[IB_CM_COMPARE_SIZE]; 370 371 if (!src_data || !dst_data) 372 return 0; 373 374 cm_mask_copy(src, src_data->data, dst_data->mask); 375 cm_mask_copy(dst, dst_data->data, src_data->mask); 376 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 377 } 378 379 static int cm_compare_private_data(u8 *private_data, 380 struct ib_cm_compare_data *dst_data) 381 { 382 u8 src[IB_CM_COMPARE_SIZE]; 383 384 if (!dst_data) 385 return 0; 386 387 cm_mask_copy(src, private_data, dst_data->mask); 388 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 389 } 390 391 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 392 { 393 struct rb_node **link = &cm.listen_service_table.rb_node; 394 struct rb_node *parent = NULL; 395 struct cm_id_private *cur_cm_id_priv; 396 __be64 service_id = cm_id_priv->id.service_id; 397 __be64 service_mask = cm_id_priv->id.service_mask; 398 int data_cmp; 399 400 while (*link) { 401 parent = *link; 402 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 403 service_node); 404 data_cmp = cm_compare_data(cm_id_priv->compare_data, 405 cur_cm_id_priv->compare_data); 406 if ((cur_cm_id_priv->id.service_mask & service_id) == 407 (service_mask & cur_cm_id_priv->id.service_id) && 408 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 409 !data_cmp) 410 return cur_cm_id_priv; 411 412 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 413 link = &(*link)->rb_left; 414 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 415 link = &(*link)->rb_right; 416 else if (service_id < cur_cm_id_priv->id.service_id) 417 link = &(*link)->rb_left; 418 else if (service_id > cur_cm_id_priv->id.service_id) 419 link = &(*link)->rb_right; 420 else if (data_cmp < 0) 421 link = &(*link)->rb_left; 422 else 423 link = &(*link)->rb_right; 424 } 425 rb_link_node(&cm_id_priv->service_node, parent, link); 426 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 427 return NULL; 428 } 429 430 static struct cm_id_private * cm_find_listen(struct ib_device *device, 431 __be64 service_id, 432 u8 *private_data) 433 { 434 struct rb_node *node = cm.listen_service_table.rb_node; 435 struct cm_id_private *cm_id_priv; 436 int data_cmp; 437 438 while (node) { 439 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 440 data_cmp = cm_compare_private_data(private_data, 441 cm_id_priv->compare_data); 442 if ((cm_id_priv->id.service_mask & service_id) == 443 cm_id_priv->id.service_id && 444 (cm_id_priv->id.device == device) && !data_cmp) 445 return cm_id_priv; 446 447 if (device < cm_id_priv->id.device) 448 node = node->rb_left; 449 else if (device > cm_id_priv->id.device) 450 node = node->rb_right; 451 else if (service_id < cm_id_priv->id.service_id) 452 node = node->rb_left; 453 else if (service_id > cm_id_priv->id.service_id) 454 node = node->rb_right; 455 else if (data_cmp < 0) 456 node = node->rb_left; 457 else 458 node = node->rb_right; 459 } 460 return NULL; 461 } 462 463 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 464 *timewait_info) 465 { 466 struct rb_node **link = &cm.remote_id_table.rb_node; 467 struct rb_node *parent = NULL; 468 struct cm_timewait_info *cur_timewait_info; 469 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 470 __be32 remote_id = timewait_info->work.remote_id; 471 472 while (*link) { 473 parent = *link; 474 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 475 remote_id_node); 476 if (remote_id < cur_timewait_info->work.remote_id) 477 link = &(*link)->rb_left; 478 else if (remote_id > cur_timewait_info->work.remote_id) 479 link = &(*link)->rb_right; 480 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 481 link = &(*link)->rb_left; 482 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 483 link = &(*link)->rb_right; 484 else 485 return cur_timewait_info; 486 } 487 timewait_info->inserted_remote_id = 1; 488 rb_link_node(&timewait_info->remote_id_node, parent, link); 489 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 490 return NULL; 491 } 492 493 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 494 __be32 remote_id) 495 { 496 struct rb_node *node = cm.remote_id_table.rb_node; 497 struct cm_timewait_info *timewait_info; 498 499 while (node) { 500 timewait_info = rb_entry(node, struct cm_timewait_info, 501 remote_id_node); 502 if (remote_id < timewait_info->work.remote_id) 503 node = node->rb_left; 504 else if (remote_id > timewait_info->work.remote_id) 505 node = node->rb_right; 506 else if (remote_ca_guid < timewait_info->remote_ca_guid) 507 node = node->rb_left; 508 else if (remote_ca_guid > timewait_info->remote_ca_guid) 509 node = node->rb_right; 510 else 511 return timewait_info; 512 } 513 return NULL; 514 } 515 516 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 517 *timewait_info) 518 { 519 struct rb_node **link = &cm.remote_qp_table.rb_node; 520 struct rb_node *parent = NULL; 521 struct cm_timewait_info *cur_timewait_info; 522 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 523 __be32 remote_qpn = timewait_info->remote_qpn; 524 525 while (*link) { 526 parent = *link; 527 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 528 remote_qp_node); 529 if (remote_qpn < cur_timewait_info->remote_qpn) 530 link = &(*link)->rb_left; 531 else if (remote_qpn > cur_timewait_info->remote_qpn) 532 link = &(*link)->rb_right; 533 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 534 link = &(*link)->rb_left; 535 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 536 link = &(*link)->rb_right; 537 else 538 return cur_timewait_info; 539 } 540 timewait_info->inserted_remote_qp = 1; 541 rb_link_node(&timewait_info->remote_qp_node, parent, link); 542 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 543 return NULL; 544 } 545 546 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 547 *cm_id_priv) 548 { 549 struct rb_node **link = &cm.remote_sidr_table.rb_node; 550 struct rb_node *parent = NULL; 551 struct cm_id_private *cur_cm_id_priv; 552 union ib_gid *port_gid = &cm_id_priv->av.dgid; 553 __be32 remote_id = cm_id_priv->id.remote_id; 554 555 while (*link) { 556 parent = *link; 557 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 558 sidr_id_node); 559 if (remote_id < cur_cm_id_priv->id.remote_id) 560 link = &(*link)->rb_left; 561 else if (remote_id > cur_cm_id_priv->id.remote_id) 562 link = &(*link)->rb_right; 563 else { 564 int cmp; 565 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 566 sizeof *port_gid); 567 if (cmp < 0) 568 link = &(*link)->rb_left; 569 else if (cmp > 0) 570 link = &(*link)->rb_right; 571 else 572 return cur_cm_id_priv; 573 } 574 } 575 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 576 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 577 return NULL; 578 } 579 580 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 581 enum ib_cm_sidr_status status) 582 { 583 struct ib_cm_sidr_rep_param param; 584 585 memset(¶m, 0, sizeof param); 586 param.status = status; 587 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 588 } 589 590 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 591 ib_cm_handler cm_handler, 592 void *context) 593 { 594 struct cm_id_private *cm_id_priv; 595 int ret; 596 597 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 598 if (!cm_id_priv) 599 return ERR_PTR(-ENOMEM); 600 601 cm_id_priv->id.state = IB_CM_IDLE; 602 cm_id_priv->id.device = device; 603 cm_id_priv->id.cm_handler = cm_handler; 604 cm_id_priv->id.context = context; 605 cm_id_priv->id.remote_cm_qpn = 1; 606 ret = cm_alloc_id(cm_id_priv); 607 if (ret) 608 goto error; 609 610 spin_lock_init(&cm_id_priv->lock); 611 init_completion(&cm_id_priv->comp); 612 INIT_LIST_HEAD(&cm_id_priv->work_list); 613 atomic_set(&cm_id_priv->work_count, -1); 614 atomic_set(&cm_id_priv->refcount, 1); 615 return &cm_id_priv->id; 616 617 error: 618 kfree(cm_id_priv); 619 return ERR_PTR(-ENOMEM); 620 } 621 EXPORT_SYMBOL(ib_create_cm_id); 622 623 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 624 { 625 struct cm_work *work; 626 627 if (list_empty(&cm_id_priv->work_list)) 628 return NULL; 629 630 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 631 list_del(&work->list); 632 return work; 633 } 634 635 static void cm_free_work(struct cm_work *work) 636 { 637 if (work->mad_recv_wc) 638 ib_free_recv_mad(work->mad_recv_wc); 639 kfree(work); 640 } 641 642 static inline int cm_convert_to_ms(int iba_time) 643 { 644 /* approximate conversion to ms from 4.096us x 2^iba_time */ 645 return 1 << max(iba_time - 8, 0); 646 } 647 648 /* 649 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 650 * Because of how ack_timeout is stored, adding one doubles the timeout. 651 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 652 * increment it (round up) only if the other is within 50%. 653 */ 654 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 655 { 656 int ack_timeout = packet_life_time + 1; 657 658 if (ack_timeout >= ca_ack_delay) 659 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 660 else 661 ack_timeout = ca_ack_delay + 662 (ack_timeout >= (ca_ack_delay - 1)); 663 664 return min(31, ack_timeout); 665 } 666 667 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 668 { 669 if (timewait_info->inserted_remote_id) { 670 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 671 timewait_info->inserted_remote_id = 0; 672 } 673 674 if (timewait_info->inserted_remote_qp) { 675 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 676 timewait_info->inserted_remote_qp = 0; 677 } 678 } 679 680 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 681 { 682 struct cm_timewait_info *timewait_info; 683 684 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 685 if (!timewait_info) 686 return ERR_PTR(-ENOMEM); 687 688 timewait_info->work.local_id = local_id; 689 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 690 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 691 return timewait_info; 692 } 693 694 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 695 { 696 int wait_time; 697 unsigned long flags; 698 699 spin_lock_irqsave(&cm.lock, flags); 700 cm_cleanup_timewait(cm_id_priv->timewait_info); 701 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 702 spin_unlock_irqrestore(&cm.lock, flags); 703 704 /* 705 * The cm_id could be destroyed by the user before we exit timewait. 706 * To protect against this, we search for the cm_id after exiting 707 * timewait before notifying the user that we've exited timewait. 708 */ 709 cm_id_priv->id.state = IB_CM_TIMEWAIT; 710 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 711 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 712 msecs_to_jiffies(wait_time)); 713 cm_id_priv->timewait_info = NULL; 714 } 715 716 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 717 { 718 unsigned long flags; 719 720 cm_id_priv->id.state = IB_CM_IDLE; 721 if (cm_id_priv->timewait_info) { 722 spin_lock_irqsave(&cm.lock, flags); 723 cm_cleanup_timewait(cm_id_priv->timewait_info); 724 spin_unlock_irqrestore(&cm.lock, flags); 725 kfree(cm_id_priv->timewait_info); 726 cm_id_priv->timewait_info = NULL; 727 } 728 } 729 730 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 731 { 732 struct cm_id_private *cm_id_priv; 733 struct cm_work *work; 734 735 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 736 retest: 737 spin_lock_irq(&cm_id_priv->lock); 738 switch (cm_id->state) { 739 case IB_CM_LISTEN: 740 cm_id->state = IB_CM_IDLE; 741 spin_unlock_irq(&cm_id_priv->lock); 742 spin_lock_irq(&cm.lock); 743 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 744 spin_unlock_irq(&cm.lock); 745 break; 746 case IB_CM_SIDR_REQ_SENT: 747 cm_id->state = IB_CM_IDLE; 748 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 749 spin_unlock_irq(&cm_id_priv->lock); 750 break; 751 case IB_CM_SIDR_REQ_RCVD: 752 spin_unlock_irq(&cm_id_priv->lock); 753 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 754 break; 755 case IB_CM_REQ_SENT: 756 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 757 spin_unlock_irq(&cm_id_priv->lock); 758 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 759 &cm_id_priv->id.device->node_guid, 760 sizeof cm_id_priv->id.device->node_guid, 761 NULL, 0); 762 break; 763 case IB_CM_REQ_RCVD: 764 if (err == -ENOMEM) { 765 /* Do not reject to allow future retries. */ 766 cm_reset_to_idle(cm_id_priv); 767 spin_unlock_irq(&cm_id_priv->lock); 768 } else { 769 spin_unlock_irq(&cm_id_priv->lock); 770 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 771 NULL, 0, NULL, 0); 772 } 773 break; 774 case IB_CM_MRA_REQ_RCVD: 775 case IB_CM_REP_SENT: 776 case IB_CM_MRA_REP_RCVD: 777 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 778 /* Fall through */ 779 case IB_CM_MRA_REQ_SENT: 780 case IB_CM_REP_RCVD: 781 case IB_CM_MRA_REP_SENT: 782 spin_unlock_irq(&cm_id_priv->lock); 783 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 784 NULL, 0, NULL, 0); 785 break; 786 case IB_CM_ESTABLISHED: 787 spin_unlock_irq(&cm_id_priv->lock); 788 ib_send_cm_dreq(cm_id, NULL, 0); 789 goto retest; 790 case IB_CM_DREQ_SENT: 791 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 792 cm_enter_timewait(cm_id_priv); 793 spin_unlock_irq(&cm_id_priv->lock); 794 break; 795 case IB_CM_DREQ_RCVD: 796 spin_unlock_irq(&cm_id_priv->lock); 797 ib_send_cm_drep(cm_id, NULL, 0); 798 break; 799 default: 800 spin_unlock_irq(&cm_id_priv->lock); 801 break; 802 } 803 804 cm_free_id(cm_id->local_id); 805 cm_deref_id(cm_id_priv); 806 wait_for_completion(&cm_id_priv->comp); 807 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 808 cm_free_work(work); 809 kfree(cm_id_priv->compare_data); 810 kfree(cm_id_priv->private_data); 811 kfree(cm_id_priv); 812 } 813 814 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 815 { 816 cm_destroy_id(cm_id, 0); 817 } 818 EXPORT_SYMBOL(ib_destroy_cm_id); 819 820 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 821 struct ib_cm_compare_data *compare_data) 822 { 823 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 824 unsigned long flags; 825 int ret = 0; 826 827 service_mask = service_mask ? service_mask : 828 __constant_cpu_to_be64(~0ULL); 829 service_id &= service_mask; 830 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 831 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 832 return -EINVAL; 833 834 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 835 if (cm_id->state != IB_CM_IDLE) 836 return -EINVAL; 837 838 if (compare_data) { 839 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 840 GFP_KERNEL); 841 if (!cm_id_priv->compare_data) 842 return -ENOMEM; 843 cm_mask_copy(cm_id_priv->compare_data->data, 844 compare_data->data, compare_data->mask); 845 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 846 IB_CM_COMPARE_SIZE); 847 } 848 849 cm_id->state = IB_CM_LISTEN; 850 851 spin_lock_irqsave(&cm.lock, flags); 852 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 853 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 854 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 855 } else { 856 cm_id->service_id = service_id; 857 cm_id->service_mask = service_mask; 858 } 859 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 860 spin_unlock_irqrestore(&cm.lock, flags); 861 862 if (cur_cm_id_priv) { 863 cm_id->state = IB_CM_IDLE; 864 kfree(cm_id_priv->compare_data); 865 cm_id_priv->compare_data = NULL; 866 ret = -EBUSY; 867 } 868 return ret; 869 } 870 EXPORT_SYMBOL(ib_cm_listen); 871 872 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 873 enum cm_msg_sequence msg_seq) 874 { 875 u64 hi_tid, low_tid; 876 877 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 878 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 879 (msg_seq << 30)); 880 return cpu_to_be64(hi_tid | low_tid); 881 } 882 883 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 884 __be16 attr_id, __be64 tid) 885 { 886 hdr->base_version = IB_MGMT_BASE_VERSION; 887 hdr->mgmt_class = IB_MGMT_CLASS_CM; 888 hdr->class_version = IB_CM_CLASS_VERSION; 889 hdr->method = IB_MGMT_METHOD_SEND; 890 hdr->attr_id = attr_id; 891 hdr->tid = tid; 892 } 893 894 static void cm_format_req(struct cm_req_msg *req_msg, 895 struct cm_id_private *cm_id_priv, 896 struct ib_cm_req_param *param) 897 { 898 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 899 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 900 901 req_msg->local_comm_id = cm_id_priv->id.local_id; 902 req_msg->service_id = param->service_id; 903 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 904 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 905 cm_req_set_resp_res(req_msg, param->responder_resources); 906 cm_req_set_init_depth(req_msg, param->initiator_depth); 907 cm_req_set_remote_resp_timeout(req_msg, 908 param->remote_cm_response_timeout); 909 cm_req_set_qp_type(req_msg, param->qp_type); 910 cm_req_set_flow_ctrl(req_msg, param->flow_control); 911 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 912 cm_req_set_local_resp_timeout(req_msg, 913 param->local_cm_response_timeout); 914 cm_req_set_retry_count(req_msg, param->retry_count); 915 req_msg->pkey = param->primary_path->pkey; 916 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 917 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 918 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 919 cm_req_set_srq(req_msg, param->srq); 920 921 req_msg->primary_local_lid = param->primary_path->slid; 922 req_msg->primary_remote_lid = param->primary_path->dlid; 923 req_msg->primary_local_gid = param->primary_path->sgid; 924 req_msg->primary_remote_gid = param->primary_path->dgid; 925 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 926 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 927 req_msg->primary_traffic_class = param->primary_path->traffic_class; 928 req_msg->primary_hop_limit = param->primary_path->hop_limit; 929 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 930 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 931 cm_req_set_primary_local_ack_timeout(req_msg, 932 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 933 param->primary_path->packet_life_time)); 934 935 if (param->alternate_path) { 936 req_msg->alt_local_lid = param->alternate_path->slid; 937 req_msg->alt_remote_lid = param->alternate_path->dlid; 938 req_msg->alt_local_gid = param->alternate_path->sgid; 939 req_msg->alt_remote_gid = param->alternate_path->dgid; 940 cm_req_set_alt_flow_label(req_msg, 941 param->alternate_path->flow_label); 942 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 943 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 944 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 945 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 946 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 947 cm_req_set_alt_local_ack_timeout(req_msg, 948 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 949 param->alternate_path->packet_life_time)); 950 } 951 952 if (param->private_data && param->private_data_len) 953 memcpy(req_msg->private_data, param->private_data, 954 param->private_data_len); 955 } 956 957 static int cm_validate_req_param(struct ib_cm_req_param *param) 958 { 959 /* peer-to-peer not supported */ 960 if (param->peer_to_peer) 961 return -EINVAL; 962 963 if (!param->primary_path) 964 return -EINVAL; 965 966 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 967 return -EINVAL; 968 969 if (param->private_data && 970 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 971 return -EINVAL; 972 973 if (param->alternate_path && 974 (param->alternate_path->pkey != param->primary_path->pkey || 975 param->alternate_path->mtu != param->primary_path->mtu)) 976 return -EINVAL; 977 978 return 0; 979 } 980 981 int ib_send_cm_req(struct ib_cm_id *cm_id, 982 struct ib_cm_req_param *param) 983 { 984 struct cm_id_private *cm_id_priv; 985 struct cm_req_msg *req_msg; 986 unsigned long flags; 987 int ret; 988 989 ret = cm_validate_req_param(param); 990 if (ret) 991 return ret; 992 993 /* Verify that we're not in timewait. */ 994 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 995 spin_lock_irqsave(&cm_id_priv->lock, flags); 996 if (cm_id->state != IB_CM_IDLE) { 997 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 998 ret = -EINVAL; 999 goto out; 1000 } 1001 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1002 1003 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1004 id.local_id); 1005 if (IS_ERR(cm_id_priv->timewait_info)) { 1006 ret = PTR_ERR(cm_id_priv->timewait_info); 1007 goto out; 1008 } 1009 1010 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1011 if (ret) 1012 goto error1; 1013 if (param->alternate_path) { 1014 ret = cm_init_av_by_path(param->alternate_path, 1015 &cm_id_priv->alt_av); 1016 if (ret) 1017 goto error1; 1018 } 1019 cm_id->service_id = param->service_id; 1020 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 1021 cm_id_priv->timeout_ms = cm_convert_to_ms( 1022 param->primary_path->packet_life_time) * 2 + 1023 cm_convert_to_ms( 1024 param->remote_cm_response_timeout); 1025 cm_id_priv->max_cm_retries = param->max_cm_retries; 1026 cm_id_priv->initiator_depth = param->initiator_depth; 1027 cm_id_priv->responder_resources = param->responder_resources; 1028 cm_id_priv->retry_count = param->retry_count; 1029 cm_id_priv->path_mtu = param->primary_path->mtu; 1030 cm_id_priv->pkey = param->primary_path->pkey; 1031 cm_id_priv->qp_type = param->qp_type; 1032 1033 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1034 if (ret) 1035 goto error1; 1036 1037 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1038 cm_format_req(req_msg, cm_id_priv, param); 1039 cm_id_priv->tid = req_msg->hdr.tid; 1040 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1041 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1042 1043 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1044 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1045 1046 spin_lock_irqsave(&cm_id_priv->lock, flags); 1047 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1048 if (ret) { 1049 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1050 goto error2; 1051 } 1052 BUG_ON(cm_id->state != IB_CM_IDLE); 1053 cm_id->state = IB_CM_REQ_SENT; 1054 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1055 return 0; 1056 1057 error2: cm_free_msg(cm_id_priv->msg); 1058 error1: kfree(cm_id_priv->timewait_info); 1059 out: return ret; 1060 } 1061 EXPORT_SYMBOL(ib_send_cm_req); 1062 1063 static int cm_issue_rej(struct cm_port *port, 1064 struct ib_mad_recv_wc *mad_recv_wc, 1065 enum ib_cm_rej_reason reason, 1066 enum cm_msg_response msg_rejected, 1067 void *ari, u8 ari_length) 1068 { 1069 struct ib_mad_send_buf *msg = NULL; 1070 struct cm_rej_msg *rej_msg, *rcv_msg; 1071 int ret; 1072 1073 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1074 if (ret) 1075 return ret; 1076 1077 /* We just need common CM header information. Cast to any message. */ 1078 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1079 rej_msg = (struct cm_rej_msg *) msg->mad; 1080 1081 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1082 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1083 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1084 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1085 rej_msg->reason = cpu_to_be16(reason); 1086 1087 if (ari && ari_length) { 1088 cm_rej_set_reject_info_len(rej_msg, ari_length); 1089 memcpy(rej_msg->ari, ari, ari_length); 1090 } 1091 1092 ret = ib_post_send_mad(msg, NULL); 1093 if (ret) 1094 cm_free_msg(msg); 1095 1096 return ret; 1097 } 1098 1099 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1100 __be32 local_qpn, __be32 remote_qpn) 1101 { 1102 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1103 ((local_ca_guid == remote_ca_guid) && 1104 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1105 } 1106 1107 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1108 struct ib_sa_path_rec *primary_path, 1109 struct ib_sa_path_rec *alt_path) 1110 { 1111 memset(primary_path, 0, sizeof *primary_path); 1112 primary_path->dgid = req_msg->primary_local_gid; 1113 primary_path->sgid = req_msg->primary_remote_gid; 1114 primary_path->dlid = req_msg->primary_local_lid; 1115 primary_path->slid = req_msg->primary_remote_lid; 1116 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1117 primary_path->hop_limit = req_msg->primary_hop_limit; 1118 primary_path->traffic_class = req_msg->primary_traffic_class; 1119 primary_path->reversible = 1; 1120 primary_path->pkey = req_msg->pkey; 1121 primary_path->sl = cm_req_get_primary_sl(req_msg); 1122 primary_path->mtu_selector = IB_SA_EQ; 1123 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1124 primary_path->rate_selector = IB_SA_EQ; 1125 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1126 primary_path->packet_life_time_selector = IB_SA_EQ; 1127 primary_path->packet_life_time = 1128 cm_req_get_primary_local_ack_timeout(req_msg); 1129 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1130 1131 if (req_msg->alt_local_lid) { 1132 memset(alt_path, 0, sizeof *alt_path); 1133 alt_path->dgid = req_msg->alt_local_gid; 1134 alt_path->sgid = req_msg->alt_remote_gid; 1135 alt_path->dlid = req_msg->alt_local_lid; 1136 alt_path->slid = req_msg->alt_remote_lid; 1137 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1138 alt_path->hop_limit = req_msg->alt_hop_limit; 1139 alt_path->traffic_class = req_msg->alt_traffic_class; 1140 alt_path->reversible = 1; 1141 alt_path->pkey = req_msg->pkey; 1142 alt_path->sl = cm_req_get_alt_sl(req_msg); 1143 alt_path->mtu_selector = IB_SA_EQ; 1144 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1145 alt_path->rate_selector = IB_SA_EQ; 1146 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1147 alt_path->packet_life_time_selector = IB_SA_EQ; 1148 alt_path->packet_life_time = 1149 cm_req_get_alt_local_ack_timeout(req_msg); 1150 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1151 } 1152 } 1153 1154 static void cm_format_req_event(struct cm_work *work, 1155 struct cm_id_private *cm_id_priv, 1156 struct ib_cm_id *listen_id) 1157 { 1158 struct cm_req_msg *req_msg; 1159 struct ib_cm_req_event_param *param; 1160 1161 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1162 param = &work->cm_event.param.req_rcvd; 1163 param->listen_id = listen_id; 1164 param->port = cm_id_priv->av.port->port_num; 1165 param->primary_path = &work->path[0]; 1166 if (req_msg->alt_local_lid) 1167 param->alternate_path = &work->path[1]; 1168 else 1169 param->alternate_path = NULL; 1170 param->remote_ca_guid = req_msg->local_ca_guid; 1171 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1172 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1173 param->qp_type = cm_req_get_qp_type(req_msg); 1174 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1175 param->responder_resources = cm_req_get_init_depth(req_msg); 1176 param->initiator_depth = cm_req_get_resp_res(req_msg); 1177 param->local_cm_response_timeout = 1178 cm_req_get_remote_resp_timeout(req_msg); 1179 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1180 param->remote_cm_response_timeout = 1181 cm_req_get_local_resp_timeout(req_msg); 1182 param->retry_count = cm_req_get_retry_count(req_msg); 1183 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1184 param->srq = cm_req_get_srq(req_msg); 1185 work->cm_event.private_data = &req_msg->private_data; 1186 } 1187 1188 static void cm_process_work(struct cm_id_private *cm_id_priv, 1189 struct cm_work *work) 1190 { 1191 int ret; 1192 1193 /* We will typically only have the current event to report. */ 1194 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1195 cm_free_work(work); 1196 1197 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1198 spin_lock_irq(&cm_id_priv->lock); 1199 work = cm_dequeue_work(cm_id_priv); 1200 spin_unlock_irq(&cm_id_priv->lock); 1201 BUG_ON(!work); 1202 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1203 &work->cm_event); 1204 cm_free_work(work); 1205 } 1206 cm_deref_id(cm_id_priv); 1207 if (ret) 1208 cm_destroy_id(&cm_id_priv->id, ret); 1209 } 1210 1211 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1212 struct cm_id_private *cm_id_priv, 1213 enum cm_msg_response msg_mraed, u8 service_timeout, 1214 const void *private_data, u8 private_data_len) 1215 { 1216 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1217 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1218 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1219 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1220 cm_mra_set_service_timeout(mra_msg, service_timeout); 1221 1222 if (private_data && private_data_len) 1223 memcpy(mra_msg->private_data, private_data, private_data_len); 1224 } 1225 1226 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1227 struct cm_id_private *cm_id_priv, 1228 enum ib_cm_rej_reason reason, 1229 void *ari, 1230 u8 ari_length, 1231 const void *private_data, 1232 u8 private_data_len) 1233 { 1234 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1235 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1236 1237 switch(cm_id_priv->id.state) { 1238 case IB_CM_REQ_RCVD: 1239 rej_msg->local_comm_id = 0; 1240 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1241 break; 1242 case IB_CM_MRA_REQ_SENT: 1243 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1244 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1245 break; 1246 case IB_CM_REP_RCVD: 1247 case IB_CM_MRA_REP_SENT: 1248 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1249 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1250 break; 1251 default: 1252 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1253 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1254 break; 1255 } 1256 1257 rej_msg->reason = cpu_to_be16(reason); 1258 if (ari && ari_length) { 1259 cm_rej_set_reject_info_len(rej_msg, ari_length); 1260 memcpy(rej_msg->ari, ari, ari_length); 1261 } 1262 1263 if (private_data && private_data_len) 1264 memcpy(rej_msg->private_data, private_data, private_data_len); 1265 } 1266 1267 static void cm_dup_req_handler(struct cm_work *work, 1268 struct cm_id_private *cm_id_priv) 1269 { 1270 struct ib_mad_send_buf *msg = NULL; 1271 int ret; 1272 1273 /* Quick state check to discard duplicate REQs. */ 1274 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1275 return; 1276 1277 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1278 if (ret) 1279 return; 1280 1281 spin_lock_irq(&cm_id_priv->lock); 1282 switch (cm_id_priv->id.state) { 1283 case IB_CM_MRA_REQ_SENT: 1284 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1285 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1286 cm_id_priv->private_data, 1287 cm_id_priv->private_data_len); 1288 break; 1289 case IB_CM_TIMEWAIT: 1290 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1291 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1292 break; 1293 default: 1294 goto unlock; 1295 } 1296 spin_unlock_irq(&cm_id_priv->lock); 1297 1298 ret = ib_post_send_mad(msg, NULL); 1299 if (ret) 1300 goto free; 1301 return; 1302 1303 unlock: spin_unlock_irq(&cm_id_priv->lock); 1304 free: cm_free_msg(msg); 1305 } 1306 1307 static struct cm_id_private * cm_match_req(struct cm_work *work, 1308 struct cm_id_private *cm_id_priv) 1309 { 1310 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1311 struct cm_timewait_info *timewait_info; 1312 struct cm_req_msg *req_msg; 1313 1314 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1315 1316 /* Check for possible duplicate REQ. */ 1317 spin_lock_irq(&cm.lock); 1318 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1319 if (timewait_info) { 1320 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1321 timewait_info->work.remote_id); 1322 spin_unlock_irq(&cm.lock); 1323 if (cur_cm_id_priv) { 1324 cm_dup_req_handler(work, cur_cm_id_priv); 1325 cm_deref_id(cur_cm_id_priv); 1326 } 1327 return NULL; 1328 } 1329 1330 /* Check for stale connections. */ 1331 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1332 if (timewait_info) { 1333 cm_cleanup_timewait(cm_id_priv->timewait_info); 1334 spin_unlock_irq(&cm.lock); 1335 cm_issue_rej(work->port, work->mad_recv_wc, 1336 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1337 NULL, 0); 1338 return NULL; 1339 } 1340 1341 /* Find matching listen request. */ 1342 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1343 req_msg->service_id, 1344 req_msg->private_data); 1345 if (!listen_cm_id_priv) { 1346 cm_cleanup_timewait(cm_id_priv->timewait_info); 1347 spin_unlock_irq(&cm.lock); 1348 cm_issue_rej(work->port, work->mad_recv_wc, 1349 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1350 NULL, 0); 1351 goto out; 1352 } 1353 atomic_inc(&listen_cm_id_priv->refcount); 1354 atomic_inc(&cm_id_priv->refcount); 1355 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1356 atomic_inc(&cm_id_priv->work_count); 1357 spin_unlock_irq(&cm.lock); 1358 out: 1359 return listen_cm_id_priv; 1360 } 1361 1362 static int cm_req_handler(struct cm_work *work) 1363 { 1364 struct ib_cm_id *cm_id; 1365 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1366 struct cm_req_msg *req_msg; 1367 int ret; 1368 1369 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1370 1371 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1372 if (IS_ERR(cm_id)) 1373 return PTR_ERR(cm_id); 1374 1375 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1376 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1377 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1378 work->mad_recv_wc->recv_buf.grh, 1379 &cm_id_priv->av); 1380 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1381 id.local_id); 1382 if (IS_ERR(cm_id_priv->timewait_info)) { 1383 ret = PTR_ERR(cm_id_priv->timewait_info); 1384 goto destroy; 1385 } 1386 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1387 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1388 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1389 1390 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1391 if (!listen_cm_id_priv) { 1392 ret = -EINVAL; 1393 kfree(cm_id_priv->timewait_info); 1394 goto destroy; 1395 } 1396 1397 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1398 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1399 cm_id_priv->id.service_id = req_msg->service_id; 1400 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1401 1402 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1403 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1404 if (ret) { 1405 ib_get_cached_gid(work->port->cm_dev->device, 1406 work->port->port_num, 0, &work->path[0].sgid); 1407 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1408 &work->path[0].sgid, sizeof work->path[0].sgid, 1409 NULL, 0); 1410 goto rejected; 1411 } 1412 if (req_msg->alt_local_lid) { 1413 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1414 if (ret) { 1415 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1416 &work->path[0].sgid, 1417 sizeof work->path[0].sgid, NULL, 0); 1418 goto rejected; 1419 } 1420 } 1421 cm_id_priv->tid = req_msg->hdr.tid; 1422 cm_id_priv->timeout_ms = cm_convert_to_ms( 1423 cm_req_get_local_resp_timeout(req_msg)); 1424 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1425 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1426 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1427 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1428 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1429 cm_id_priv->pkey = req_msg->pkey; 1430 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1431 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1432 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1433 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1434 1435 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1436 cm_process_work(cm_id_priv, work); 1437 cm_deref_id(listen_cm_id_priv); 1438 return 0; 1439 1440 rejected: 1441 atomic_dec(&cm_id_priv->refcount); 1442 cm_deref_id(listen_cm_id_priv); 1443 destroy: 1444 ib_destroy_cm_id(cm_id); 1445 return ret; 1446 } 1447 1448 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1449 struct cm_id_private *cm_id_priv, 1450 struct ib_cm_rep_param *param) 1451 { 1452 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1453 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1454 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1455 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1456 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1457 rep_msg->resp_resources = param->responder_resources; 1458 rep_msg->initiator_depth = param->initiator_depth; 1459 cm_rep_set_target_ack_delay(rep_msg, 1460 cm_id_priv->av.port->cm_dev->ack_delay); 1461 cm_rep_set_failover(rep_msg, param->failover_accepted); 1462 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1463 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1464 cm_rep_set_srq(rep_msg, param->srq); 1465 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1466 1467 if (param->private_data && param->private_data_len) 1468 memcpy(rep_msg->private_data, param->private_data, 1469 param->private_data_len); 1470 } 1471 1472 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1473 struct ib_cm_rep_param *param) 1474 { 1475 struct cm_id_private *cm_id_priv; 1476 struct ib_mad_send_buf *msg; 1477 struct cm_rep_msg *rep_msg; 1478 unsigned long flags; 1479 int ret; 1480 1481 if (param->private_data && 1482 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1483 return -EINVAL; 1484 1485 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1486 spin_lock_irqsave(&cm_id_priv->lock, flags); 1487 if (cm_id->state != IB_CM_REQ_RCVD && 1488 cm_id->state != IB_CM_MRA_REQ_SENT) { 1489 ret = -EINVAL; 1490 goto out; 1491 } 1492 1493 ret = cm_alloc_msg(cm_id_priv, &msg); 1494 if (ret) 1495 goto out; 1496 1497 rep_msg = (struct cm_rep_msg *) msg->mad; 1498 cm_format_rep(rep_msg, cm_id_priv, param); 1499 msg->timeout_ms = cm_id_priv->timeout_ms; 1500 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1501 1502 ret = ib_post_send_mad(msg, NULL); 1503 if (ret) { 1504 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1505 cm_free_msg(msg); 1506 return ret; 1507 } 1508 1509 cm_id->state = IB_CM_REP_SENT; 1510 cm_id_priv->msg = msg; 1511 cm_id_priv->initiator_depth = param->initiator_depth; 1512 cm_id_priv->responder_resources = param->responder_resources; 1513 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1514 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1515 1516 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1517 return ret; 1518 } 1519 EXPORT_SYMBOL(ib_send_cm_rep); 1520 1521 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1522 struct cm_id_private *cm_id_priv, 1523 const void *private_data, 1524 u8 private_data_len) 1525 { 1526 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1527 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1528 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1529 1530 if (private_data && private_data_len) 1531 memcpy(rtu_msg->private_data, private_data, private_data_len); 1532 } 1533 1534 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1535 const void *private_data, 1536 u8 private_data_len) 1537 { 1538 struct cm_id_private *cm_id_priv; 1539 struct ib_mad_send_buf *msg; 1540 unsigned long flags; 1541 void *data; 1542 int ret; 1543 1544 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1545 return -EINVAL; 1546 1547 data = cm_copy_private_data(private_data, private_data_len); 1548 if (IS_ERR(data)) 1549 return PTR_ERR(data); 1550 1551 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1552 spin_lock_irqsave(&cm_id_priv->lock, flags); 1553 if (cm_id->state != IB_CM_REP_RCVD && 1554 cm_id->state != IB_CM_MRA_REP_SENT) { 1555 ret = -EINVAL; 1556 goto error; 1557 } 1558 1559 ret = cm_alloc_msg(cm_id_priv, &msg); 1560 if (ret) 1561 goto error; 1562 1563 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1564 private_data, private_data_len); 1565 1566 ret = ib_post_send_mad(msg, NULL); 1567 if (ret) { 1568 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1569 cm_free_msg(msg); 1570 kfree(data); 1571 return ret; 1572 } 1573 1574 cm_id->state = IB_CM_ESTABLISHED; 1575 cm_set_private_data(cm_id_priv, data, private_data_len); 1576 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1577 return 0; 1578 1579 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1580 kfree(data); 1581 return ret; 1582 } 1583 EXPORT_SYMBOL(ib_send_cm_rtu); 1584 1585 static void cm_format_rep_event(struct cm_work *work) 1586 { 1587 struct cm_rep_msg *rep_msg; 1588 struct ib_cm_rep_event_param *param; 1589 1590 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1591 param = &work->cm_event.param.rep_rcvd; 1592 param->remote_ca_guid = rep_msg->local_ca_guid; 1593 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1594 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1595 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1596 param->responder_resources = rep_msg->initiator_depth; 1597 param->initiator_depth = rep_msg->resp_resources; 1598 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1599 param->failover_accepted = cm_rep_get_failover(rep_msg); 1600 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1601 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1602 param->srq = cm_rep_get_srq(rep_msg); 1603 work->cm_event.private_data = &rep_msg->private_data; 1604 } 1605 1606 static void cm_dup_rep_handler(struct cm_work *work) 1607 { 1608 struct cm_id_private *cm_id_priv; 1609 struct cm_rep_msg *rep_msg; 1610 struct ib_mad_send_buf *msg = NULL; 1611 int ret; 1612 1613 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1614 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1615 rep_msg->local_comm_id); 1616 if (!cm_id_priv) 1617 return; 1618 1619 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1620 if (ret) 1621 goto deref; 1622 1623 spin_lock_irq(&cm_id_priv->lock); 1624 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1625 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1626 cm_id_priv->private_data, 1627 cm_id_priv->private_data_len); 1628 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1629 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1630 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1631 cm_id_priv->private_data, 1632 cm_id_priv->private_data_len); 1633 else 1634 goto unlock; 1635 spin_unlock_irq(&cm_id_priv->lock); 1636 1637 ret = ib_post_send_mad(msg, NULL); 1638 if (ret) 1639 goto free; 1640 goto deref; 1641 1642 unlock: spin_unlock_irq(&cm_id_priv->lock); 1643 free: cm_free_msg(msg); 1644 deref: cm_deref_id(cm_id_priv); 1645 } 1646 1647 static int cm_rep_handler(struct cm_work *work) 1648 { 1649 struct cm_id_private *cm_id_priv; 1650 struct cm_rep_msg *rep_msg; 1651 int ret; 1652 1653 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1654 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1655 if (!cm_id_priv) { 1656 cm_dup_rep_handler(work); 1657 return -EINVAL; 1658 } 1659 1660 cm_format_rep_event(work); 1661 1662 spin_lock_irq(&cm_id_priv->lock); 1663 switch (cm_id_priv->id.state) { 1664 case IB_CM_REQ_SENT: 1665 case IB_CM_MRA_REQ_RCVD: 1666 break; 1667 default: 1668 spin_unlock_irq(&cm_id_priv->lock); 1669 ret = -EINVAL; 1670 goto error; 1671 } 1672 1673 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1674 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1675 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1676 1677 spin_lock(&cm.lock); 1678 /* Check for duplicate REP. */ 1679 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1680 spin_unlock(&cm.lock); 1681 spin_unlock_irq(&cm_id_priv->lock); 1682 ret = -EINVAL; 1683 goto error; 1684 } 1685 /* Check for a stale connection. */ 1686 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1687 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1688 &cm.remote_id_table); 1689 cm_id_priv->timewait_info->inserted_remote_id = 0; 1690 spin_unlock(&cm.lock); 1691 spin_unlock_irq(&cm_id_priv->lock); 1692 cm_issue_rej(work->port, work->mad_recv_wc, 1693 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1694 NULL, 0); 1695 ret = -EINVAL; 1696 goto error; 1697 } 1698 spin_unlock(&cm.lock); 1699 1700 cm_id_priv->id.state = IB_CM_REP_RCVD; 1701 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1702 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1703 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1704 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1705 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1706 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1707 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1708 cm_id_priv->av.timeout = 1709 cm_ack_timeout(cm_id_priv->target_ack_delay, 1710 cm_id_priv->av.timeout - 1); 1711 cm_id_priv->alt_av.timeout = 1712 cm_ack_timeout(cm_id_priv->target_ack_delay, 1713 cm_id_priv->alt_av.timeout - 1); 1714 1715 /* todo: handle peer_to_peer */ 1716 1717 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1718 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1719 if (!ret) 1720 list_add_tail(&work->list, &cm_id_priv->work_list); 1721 spin_unlock_irq(&cm_id_priv->lock); 1722 1723 if (ret) 1724 cm_process_work(cm_id_priv, work); 1725 else 1726 cm_deref_id(cm_id_priv); 1727 return 0; 1728 1729 error: 1730 cm_deref_id(cm_id_priv); 1731 return ret; 1732 } 1733 1734 static int cm_establish_handler(struct cm_work *work) 1735 { 1736 struct cm_id_private *cm_id_priv; 1737 int ret; 1738 1739 /* See comment in cm_establish about lookup. */ 1740 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1741 if (!cm_id_priv) 1742 return -EINVAL; 1743 1744 spin_lock_irq(&cm_id_priv->lock); 1745 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1746 spin_unlock_irq(&cm_id_priv->lock); 1747 goto out; 1748 } 1749 1750 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1751 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1752 if (!ret) 1753 list_add_tail(&work->list, &cm_id_priv->work_list); 1754 spin_unlock_irq(&cm_id_priv->lock); 1755 1756 if (ret) 1757 cm_process_work(cm_id_priv, work); 1758 else 1759 cm_deref_id(cm_id_priv); 1760 return 0; 1761 out: 1762 cm_deref_id(cm_id_priv); 1763 return -EINVAL; 1764 } 1765 1766 static int cm_rtu_handler(struct cm_work *work) 1767 { 1768 struct cm_id_private *cm_id_priv; 1769 struct cm_rtu_msg *rtu_msg; 1770 int ret; 1771 1772 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1773 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1774 rtu_msg->local_comm_id); 1775 if (!cm_id_priv) 1776 return -EINVAL; 1777 1778 work->cm_event.private_data = &rtu_msg->private_data; 1779 1780 spin_lock_irq(&cm_id_priv->lock); 1781 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1782 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1783 spin_unlock_irq(&cm_id_priv->lock); 1784 goto out; 1785 } 1786 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1787 1788 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1789 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1790 if (!ret) 1791 list_add_tail(&work->list, &cm_id_priv->work_list); 1792 spin_unlock_irq(&cm_id_priv->lock); 1793 1794 if (ret) 1795 cm_process_work(cm_id_priv, work); 1796 else 1797 cm_deref_id(cm_id_priv); 1798 return 0; 1799 out: 1800 cm_deref_id(cm_id_priv); 1801 return -EINVAL; 1802 } 1803 1804 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1805 struct cm_id_private *cm_id_priv, 1806 const void *private_data, 1807 u8 private_data_len) 1808 { 1809 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1810 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1811 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1812 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1813 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1814 1815 if (private_data && private_data_len) 1816 memcpy(dreq_msg->private_data, private_data, private_data_len); 1817 } 1818 1819 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1820 const void *private_data, 1821 u8 private_data_len) 1822 { 1823 struct cm_id_private *cm_id_priv; 1824 struct ib_mad_send_buf *msg; 1825 unsigned long flags; 1826 int ret; 1827 1828 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1829 return -EINVAL; 1830 1831 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1832 spin_lock_irqsave(&cm_id_priv->lock, flags); 1833 if (cm_id->state != IB_CM_ESTABLISHED) { 1834 ret = -EINVAL; 1835 goto out; 1836 } 1837 1838 ret = cm_alloc_msg(cm_id_priv, &msg); 1839 if (ret) { 1840 cm_enter_timewait(cm_id_priv); 1841 goto out; 1842 } 1843 1844 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1845 private_data, private_data_len); 1846 msg->timeout_ms = cm_id_priv->timeout_ms; 1847 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1848 1849 ret = ib_post_send_mad(msg, NULL); 1850 if (ret) { 1851 cm_enter_timewait(cm_id_priv); 1852 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1853 cm_free_msg(msg); 1854 return ret; 1855 } 1856 1857 cm_id->state = IB_CM_DREQ_SENT; 1858 cm_id_priv->msg = msg; 1859 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1860 return ret; 1861 } 1862 EXPORT_SYMBOL(ib_send_cm_dreq); 1863 1864 static void cm_format_drep(struct cm_drep_msg *drep_msg, 1865 struct cm_id_private *cm_id_priv, 1866 const void *private_data, 1867 u8 private_data_len) 1868 { 1869 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1870 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1871 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1872 1873 if (private_data && private_data_len) 1874 memcpy(drep_msg->private_data, private_data, private_data_len); 1875 } 1876 1877 int ib_send_cm_drep(struct ib_cm_id *cm_id, 1878 const void *private_data, 1879 u8 private_data_len) 1880 { 1881 struct cm_id_private *cm_id_priv; 1882 struct ib_mad_send_buf *msg; 1883 unsigned long flags; 1884 void *data; 1885 int ret; 1886 1887 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1888 return -EINVAL; 1889 1890 data = cm_copy_private_data(private_data, private_data_len); 1891 if (IS_ERR(data)) 1892 return PTR_ERR(data); 1893 1894 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1895 spin_lock_irqsave(&cm_id_priv->lock, flags); 1896 if (cm_id->state != IB_CM_DREQ_RCVD) { 1897 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1898 kfree(data); 1899 return -EINVAL; 1900 } 1901 1902 cm_set_private_data(cm_id_priv, data, private_data_len); 1903 cm_enter_timewait(cm_id_priv); 1904 1905 ret = cm_alloc_msg(cm_id_priv, &msg); 1906 if (ret) 1907 goto out; 1908 1909 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1910 private_data, private_data_len); 1911 1912 ret = ib_post_send_mad(msg, NULL); 1913 if (ret) { 1914 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1915 cm_free_msg(msg); 1916 return ret; 1917 } 1918 1919 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1920 return ret; 1921 } 1922 EXPORT_SYMBOL(ib_send_cm_drep); 1923 1924 static int cm_issue_drep(struct cm_port *port, 1925 struct ib_mad_recv_wc *mad_recv_wc) 1926 { 1927 struct ib_mad_send_buf *msg = NULL; 1928 struct cm_dreq_msg *dreq_msg; 1929 struct cm_drep_msg *drep_msg; 1930 int ret; 1931 1932 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1933 if (ret) 1934 return ret; 1935 1936 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 1937 drep_msg = (struct cm_drep_msg *) msg->mad; 1938 1939 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 1940 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 1941 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 1942 1943 ret = ib_post_send_mad(msg, NULL); 1944 if (ret) 1945 cm_free_msg(msg); 1946 1947 return ret; 1948 } 1949 1950 static int cm_dreq_handler(struct cm_work *work) 1951 { 1952 struct cm_id_private *cm_id_priv; 1953 struct cm_dreq_msg *dreq_msg; 1954 struct ib_mad_send_buf *msg = NULL; 1955 int ret; 1956 1957 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1958 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1959 dreq_msg->local_comm_id); 1960 if (!cm_id_priv) { 1961 cm_issue_drep(work->port, work->mad_recv_wc); 1962 return -EINVAL; 1963 } 1964 1965 work->cm_event.private_data = &dreq_msg->private_data; 1966 1967 spin_lock_irq(&cm_id_priv->lock); 1968 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1969 goto unlock; 1970 1971 switch (cm_id_priv->id.state) { 1972 case IB_CM_REP_SENT: 1973 case IB_CM_DREQ_SENT: 1974 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1975 break; 1976 case IB_CM_ESTABLISHED: 1977 case IB_CM_MRA_REP_RCVD: 1978 break; 1979 case IB_CM_TIMEWAIT: 1980 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1981 goto unlock; 1982 1983 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1984 cm_id_priv->private_data, 1985 cm_id_priv->private_data_len); 1986 spin_unlock_irq(&cm_id_priv->lock); 1987 1988 if (ib_post_send_mad(msg, NULL)) 1989 cm_free_msg(msg); 1990 goto deref; 1991 default: 1992 goto unlock; 1993 } 1994 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 1995 cm_id_priv->tid = dreq_msg->hdr.tid; 1996 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1997 if (!ret) 1998 list_add_tail(&work->list, &cm_id_priv->work_list); 1999 spin_unlock_irq(&cm_id_priv->lock); 2000 2001 if (ret) 2002 cm_process_work(cm_id_priv, work); 2003 else 2004 cm_deref_id(cm_id_priv); 2005 return 0; 2006 2007 unlock: spin_unlock_irq(&cm_id_priv->lock); 2008 deref: cm_deref_id(cm_id_priv); 2009 return -EINVAL; 2010 } 2011 2012 static int cm_drep_handler(struct cm_work *work) 2013 { 2014 struct cm_id_private *cm_id_priv; 2015 struct cm_drep_msg *drep_msg; 2016 int ret; 2017 2018 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2019 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2020 drep_msg->local_comm_id); 2021 if (!cm_id_priv) 2022 return -EINVAL; 2023 2024 work->cm_event.private_data = &drep_msg->private_data; 2025 2026 spin_lock_irq(&cm_id_priv->lock); 2027 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2028 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2029 spin_unlock_irq(&cm_id_priv->lock); 2030 goto out; 2031 } 2032 cm_enter_timewait(cm_id_priv); 2033 2034 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2035 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2036 if (!ret) 2037 list_add_tail(&work->list, &cm_id_priv->work_list); 2038 spin_unlock_irq(&cm_id_priv->lock); 2039 2040 if (ret) 2041 cm_process_work(cm_id_priv, work); 2042 else 2043 cm_deref_id(cm_id_priv); 2044 return 0; 2045 out: 2046 cm_deref_id(cm_id_priv); 2047 return -EINVAL; 2048 } 2049 2050 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2051 enum ib_cm_rej_reason reason, 2052 void *ari, 2053 u8 ari_length, 2054 const void *private_data, 2055 u8 private_data_len) 2056 { 2057 struct cm_id_private *cm_id_priv; 2058 struct ib_mad_send_buf *msg; 2059 unsigned long flags; 2060 int ret; 2061 2062 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2063 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2064 return -EINVAL; 2065 2066 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2067 2068 spin_lock_irqsave(&cm_id_priv->lock, flags); 2069 switch (cm_id->state) { 2070 case IB_CM_REQ_SENT: 2071 case IB_CM_MRA_REQ_RCVD: 2072 case IB_CM_REQ_RCVD: 2073 case IB_CM_MRA_REQ_SENT: 2074 case IB_CM_REP_RCVD: 2075 case IB_CM_MRA_REP_SENT: 2076 ret = cm_alloc_msg(cm_id_priv, &msg); 2077 if (!ret) 2078 cm_format_rej((struct cm_rej_msg *) msg->mad, 2079 cm_id_priv, reason, ari, ari_length, 2080 private_data, private_data_len); 2081 2082 cm_reset_to_idle(cm_id_priv); 2083 break; 2084 case IB_CM_REP_SENT: 2085 case IB_CM_MRA_REP_RCVD: 2086 ret = cm_alloc_msg(cm_id_priv, &msg); 2087 if (!ret) 2088 cm_format_rej((struct cm_rej_msg *) msg->mad, 2089 cm_id_priv, reason, ari, ari_length, 2090 private_data, private_data_len); 2091 2092 cm_enter_timewait(cm_id_priv); 2093 break; 2094 default: 2095 ret = -EINVAL; 2096 goto out; 2097 } 2098 2099 if (ret) 2100 goto out; 2101 2102 ret = ib_post_send_mad(msg, NULL); 2103 if (ret) 2104 cm_free_msg(msg); 2105 2106 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2107 return ret; 2108 } 2109 EXPORT_SYMBOL(ib_send_cm_rej); 2110 2111 static void cm_format_rej_event(struct cm_work *work) 2112 { 2113 struct cm_rej_msg *rej_msg; 2114 struct ib_cm_rej_event_param *param; 2115 2116 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2117 param = &work->cm_event.param.rej_rcvd; 2118 param->ari = rej_msg->ari; 2119 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2120 param->reason = __be16_to_cpu(rej_msg->reason); 2121 work->cm_event.private_data = &rej_msg->private_data; 2122 } 2123 2124 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2125 { 2126 struct cm_timewait_info *timewait_info; 2127 struct cm_id_private *cm_id_priv; 2128 __be32 remote_id; 2129 2130 remote_id = rej_msg->local_comm_id; 2131 2132 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2133 spin_lock_irq(&cm.lock); 2134 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2135 remote_id); 2136 if (!timewait_info) { 2137 spin_unlock_irq(&cm.lock); 2138 return NULL; 2139 } 2140 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2141 (timewait_info->work.local_id ^ 2142 cm.random_id_operand)); 2143 if (cm_id_priv) { 2144 if (cm_id_priv->id.remote_id == remote_id) 2145 atomic_inc(&cm_id_priv->refcount); 2146 else 2147 cm_id_priv = NULL; 2148 } 2149 spin_unlock_irq(&cm.lock); 2150 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2151 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2152 else 2153 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2154 2155 return cm_id_priv; 2156 } 2157 2158 static int cm_rej_handler(struct cm_work *work) 2159 { 2160 struct cm_id_private *cm_id_priv; 2161 struct cm_rej_msg *rej_msg; 2162 int ret; 2163 2164 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2165 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2166 if (!cm_id_priv) 2167 return -EINVAL; 2168 2169 cm_format_rej_event(work); 2170 2171 spin_lock_irq(&cm_id_priv->lock); 2172 switch (cm_id_priv->id.state) { 2173 case IB_CM_REQ_SENT: 2174 case IB_CM_MRA_REQ_RCVD: 2175 case IB_CM_REP_SENT: 2176 case IB_CM_MRA_REP_RCVD: 2177 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2178 /* fall through */ 2179 case IB_CM_REQ_RCVD: 2180 case IB_CM_MRA_REQ_SENT: 2181 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2182 cm_enter_timewait(cm_id_priv); 2183 else 2184 cm_reset_to_idle(cm_id_priv); 2185 break; 2186 case IB_CM_DREQ_SENT: 2187 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2188 /* fall through */ 2189 case IB_CM_REP_RCVD: 2190 case IB_CM_MRA_REP_SENT: 2191 case IB_CM_ESTABLISHED: 2192 cm_enter_timewait(cm_id_priv); 2193 break; 2194 default: 2195 spin_unlock_irq(&cm_id_priv->lock); 2196 ret = -EINVAL; 2197 goto out; 2198 } 2199 2200 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2201 if (!ret) 2202 list_add_tail(&work->list, &cm_id_priv->work_list); 2203 spin_unlock_irq(&cm_id_priv->lock); 2204 2205 if (ret) 2206 cm_process_work(cm_id_priv, work); 2207 else 2208 cm_deref_id(cm_id_priv); 2209 return 0; 2210 out: 2211 cm_deref_id(cm_id_priv); 2212 return -EINVAL; 2213 } 2214 2215 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2216 u8 service_timeout, 2217 const void *private_data, 2218 u8 private_data_len) 2219 { 2220 struct cm_id_private *cm_id_priv; 2221 struct ib_mad_send_buf *msg; 2222 enum ib_cm_state cm_state; 2223 enum ib_cm_lap_state lap_state; 2224 enum cm_msg_response msg_response; 2225 void *data; 2226 unsigned long flags; 2227 int ret; 2228 2229 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2230 return -EINVAL; 2231 2232 data = cm_copy_private_data(private_data, private_data_len); 2233 if (IS_ERR(data)) 2234 return PTR_ERR(data); 2235 2236 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2237 2238 spin_lock_irqsave(&cm_id_priv->lock, flags); 2239 switch(cm_id_priv->id.state) { 2240 case IB_CM_REQ_RCVD: 2241 cm_state = IB_CM_MRA_REQ_SENT; 2242 lap_state = cm_id->lap_state; 2243 msg_response = CM_MSG_RESPONSE_REQ; 2244 break; 2245 case IB_CM_REP_RCVD: 2246 cm_state = IB_CM_MRA_REP_SENT; 2247 lap_state = cm_id->lap_state; 2248 msg_response = CM_MSG_RESPONSE_REP; 2249 break; 2250 case IB_CM_ESTABLISHED: 2251 cm_state = cm_id->state; 2252 lap_state = IB_CM_MRA_LAP_SENT; 2253 msg_response = CM_MSG_RESPONSE_OTHER; 2254 break; 2255 default: 2256 ret = -EINVAL; 2257 goto error1; 2258 } 2259 2260 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2261 ret = cm_alloc_msg(cm_id_priv, &msg); 2262 if (ret) 2263 goto error1; 2264 2265 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2266 msg_response, service_timeout, 2267 private_data, private_data_len); 2268 ret = ib_post_send_mad(msg, NULL); 2269 if (ret) 2270 goto error2; 2271 } 2272 2273 cm_id->state = cm_state; 2274 cm_id->lap_state = lap_state; 2275 cm_id_priv->service_timeout = service_timeout; 2276 cm_set_private_data(cm_id_priv, data, private_data_len); 2277 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2278 return 0; 2279 2280 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2281 kfree(data); 2282 return ret; 2283 2284 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2285 kfree(data); 2286 cm_free_msg(msg); 2287 return ret; 2288 } 2289 EXPORT_SYMBOL(ib_send_cm_mra); 2290 2291 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2292 { 2293 switch (cm_mra_get_msg_mraed(mra_msg)) { 2294 case CM_MSG_RESPONSE_REQ: 2295 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2296 case CM_MSG_RESPONSE_REP: 2297 case CM_MSG_RESPONSE_OTHER: 2298 return cm_acquire_id(mra_msg->remote_comm_id, 2299 mra_msg->local_comm_id); 2300 default: 2301 return NULL; 2302 } 2303 } 2304 2305 static int cm_mra_handler(struct cm_work *work) 2306 { 2307 struct cm_id_private *cm_id_priv; 2308 struct cm_mra_msg *mra_msg; 2309 int timeout, ret; 2310 2311 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2312 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2313 if (!cm_id_priv) 2314 return -EINVAL; 2315 2316 work->cm_event.private_data = &mra_msg->private_data; 2317 work->cm_event.param.mra_rcvd.service_timeout = 2318 cm_mra_get_service_timeout(mra_msg); 2319 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2320 cm_convert_to_ms(cm_id_priv->av.timeout); 2321 2322 spin_lock_irq(&cm_id_priv->lock); 2323 switch (cm_id_priv->id.state) { 2324 case IB_CM_REQ_SENT: 2325 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2326 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2327 cm_id_priv->msg, timeout)) 2328 goto out; 2329 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2330 break; 2331 case IB_CM_REP_SENT: 2332 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2333 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2334 cm_id_priv->msg, timeout)) 2335 goto out; 2336 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2337 break; 2338 case IB_CM_ESTABLISHED: 2339 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2340 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2341 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2342 cm_id_priv->msg, timeout)) 2343 goto out; 2344 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2345 break; 2346 default: 2347 goto out; 2348 } 2349 2350 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2351 cm_id_priv->id.state; 2352 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2353 if (!ret) 2354 list_add_tail(&work->list, &cm_id_priv->work_list); 2355 spin_unlock_irq(&cm_id_priv->lock); 2356 2357 if (ret) 2358 cm_process_work(cm_id_priv, work); 2359 else 2360 cm_deref_id(cm_id_priv); 2361 return 0; 2362 out: 2363 spin_unlock_irq(&cm_id_priv->lock); 2364 cm_deref_id(cm_id_priv); 2365 return -EINVAL; 2366 } 2367 2368 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2369 struct cm_id_private *cm_id_priv, 2370 struct ib_sa_path_rec *alternate_path, 2371 const void *private_data, 2372 u8 private_data_len) 2373 { 2374 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2375 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2376 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2377 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2378 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2379 /* todo: need remote CM response timeout */ 2380 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2381 lap_msg->alt_local_lid = alternate_path->slid; 2382 lap_msg->alt_remote_lid = alternate_path->dlid; 2383 lap_msg->alt_local_gid = alternate_path->sgid; 2384 lap_msg->alt_remote_gid = alternate_path->dgid; 2385 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2386 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2387 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2388 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2389 cm_lap_set_sl(lap_msg, alternate_path->sl); 2390 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2391 cm_lap_set_local_ack_timeout(lap_msg, 2392 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2393 alternate_path->packet_life_time)); 2394 2395 if (private_data && private_data_len) 2396 memcpy(lap_msg->private_data, private_data, private_data_len); 2397 } 2398 2399 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2400 struct ib_sa_path_rec *alternate_path, 2401 const void *private_data, 2402 u8 private_data_len) 2403 { 2404 struct cm_id_private *cm_id_priv; 2405 struct ib_mad_send_buf *msg; 2406 unsigned long flags; 2407 int ret; 2408 2409 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2410 return -EINVAL; 2411 2412 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2413 spin_lock_irqsave(&cm_id_priv->lock, flags); 2414 if (cm_id->state != IB_CM_ESTABLISHED || 2415 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2416 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2417 ret = -EINVAL; 2418 goto out; 2419 } 2420 2421 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2422 if (ret) 2423 goto out; 2424 cm_id_priv->alt_av.timeout = 2425 cm_ack_timeout(cm_id_priv->target_ack_delay, 2426 cm_id_priv->alt_av.timeout - 1); 2427 2428 ret = cm_alloc_msg(cm_id_priv, &msg); 2429 if (ret) 2430 goto out; 2431 2432 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2433 alternate_path, private_data, private_data_len); 2434 msg->timeout_ms = cm_id_priv->timeout_ms; 2435 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2436 2437 ret = ib_post_send_mad(msg, NULL); 2438 if (ret) { 2439 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2440 cm_free_msg(msg); 2441 return ret; 2442 } 2443 2444 cm_id->lap_state = IB_CM_LAP_SENT; 2445 cm_id_priv->msg = msg; 2446 2447 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2448 return ret; 2449 } 2450 EXPORT_SYMBOL(ib_send_cm_lap); 2451 2452 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2453 struct ib_sa_path_rec *path, 2454 struct cm_lap_msg *lap_msg) 2455 { 2456 memset(path, 0, sizeof *path); 2457 path->dgid = lap_msg->alt_local_gid; 2458 path->sgid = lap_msg->alt_remote_gid; 2459 path->dlid = lap_msg->alt_local_lid; 2460 path->slid = lap_msg->alt_remote_lid; 2461 path->flow_label = cm_lap_get_flow_label(lap_msg); 2462 path->hop_limit = lap_msg->alt_hop_limit; 2463 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2464 path->reversible = 1; 2465 path->pkey = cm_id_priv->pkey; 2466 path->sl = cm_lap_get_sl(lap_msg); 2467 path->mtu_selector = IB_SA_EQ; 2468 path->mtu = cm_id_priv->path_mtu; 2469 path->rate_selector = IB_SA_EQ; 2470 path->rate = cm_lap_get_packet_rate(lap_msg); 2471 path->packet_life_time_selector = IB_SA_EQ; 2472 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2473 path->packet_life_time -= (path->packet_life_time > 0); 2474 } 2475 2476 static int cm_lap_handler(struct cm_work *work) 2477 { 2478 struct cm_id_private *cm_id_priv; 2479 struct cm_lap_msg *lap_msg; 2480 struct ib_cm_lap_event_param *param; 2481 struct ib_mad_send_buf *msg = NULL; 2482 int ret; 2483 2484 /* todo: verify LAP request and send reject APR if invalid. */ 2485 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2486 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2487 lap_msg->local_comm_id); 2488 if (!cm_id_priv) 2489 return -EINVAL; 2490 2491 param = &work->cm_event.param.lap_rcvd; 2492 param->alternate_path = &work->path[0]; 2493 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2494 work->cm_event.private_data = &lap_msg->private_data; 2495 2496 spin_lock_irq(&cm_id_priv->lock); 2497 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2498 goto unlock; 2499 2500 switch (cm_id_priv->id.lap_state) { 2501 case IB_CM_LAP_UNINIT: 2502 case IB_CM_LAP_IDLE: 2503 break; 2504 case IB_CM_MRA_LAP_SENT: 2505 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2506 goto unlock; 2507 2508 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2509 CM_MSG_RESPONSE_OTHER, 2510 cm_id_priv->service_timeout, 2511 cm_id_priv->private_data, 2512 cm_id_priv->private_data_len); 2513 spin_unlock_irq(&cm_id_priv->lock); 2514 2515 if (ib_post_send_mad(msg, NULL)) 2516 cm_free_msg(msg); 2517 goto deref; 2518 default: 2519 goto unlock; 2520 } 2521 2522 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2523 cm_id_priv->tid = lap_msg->hdr.tid; 2524 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2525 work->mad_recv_wc->recv_buf.grh, 2526 &cm_id_priv->av); 2527 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2528 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2529 if (!ret) 2530 list_add_tail(&work->list, &cm_id_priv->work_list); 2531 spin_unlock_irq(&cm_id_priv->lock); 2532 2533 if (ret) 2534 cm_process_work(cm_id_priv, work); 2535 else 2536 cm_deref_id(cm_id_priv); 2537 return 0; 2538 2539 unlock: spin_unlock_irq(&cm_id_priv->lock); 2540 deref: cm_deref_id(cm_id_priv); 2541 return -EINVAL; 2542 } 2543 2544 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2545 struct cm_id_private *cm_id_priv, 2546 enum ib_cm_apr_status status, 2547 void *info, 2548 u8 info_length, 2549 const void *private_data, 2550 u8 private_data_len) 2551 { 2552 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2553 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2554 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2555 apr_msg->ap_status = (u8) status; 2556 2557 if (info && info_length) { 2558 apr_msg->info_length = info_length; 2559 memcpy(apr_msg->info, info, info_length); 2560 } 2561 2562 if (private_data && private_data_len) 2563 memcpy(apr_msg->private_data, private_data, private_data_len); 2564 } 2565 2566 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2567 enum ib_cm_apr_status status, 2568 void *info, 2569 u8 info_length, 2570 const void *private_data, 2571 u8 private_data_len) 2572 { 2573 struct cm_id_private *cm_id_priv; 2574 struct ib_mad_send_buf *msg; 2575 unsigned long flags; 2576 int ret; 2577 2578 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2579 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2580 return -EINVAL; 2581 2582 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2583 spin_lock_irqsave(&cm_id_priv->lock, flags); 2584 if (cm_id->state != IB_CM_ESTABLISHED || 2585 (cm_id->lap_state != IB_CM_LAP_RCVD && 2586 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2587 ret = -EINVAL; 2588 goto out; 2589 } 2590 2591 ret = cm_alloc_msg(cm_id_priv, &msg); 2592 if (ret) 2593 goto out; 2594 2595 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2596 info, info_length, private_data, private_data_len); 2597 ret = ib_post_send_mad(msg, NULL); 2598 if (ret) { 2599 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2600 cm_free_msg(msg); 2601 return ret; 2602 } 2603 2604 cm_id->lap_state = IB_CM_LAP_IDLE; 2605 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2606 return ret; 2607 } 2608 EXPORT_SYMBOL(ib_send_cm_apr); 2609 2610 static int cm_apr_handler(struct cm_work *work) 2611 { 2612 struct cm_id_private *cm_id_priv; 2613 struct cm_apr_msg *apr_msg; 2614 int ret; 2615 2616 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2617 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2618 apr_msg->local_comm_id); 2619 if (!cm_id_priv) 2620 return -EINVAL; /* Unmatched reply. */ 2621 2622 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2623 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2624 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2625 work->cm_event.private_data = &apr_msg->private_data; 2626 2627 spin_lock_irq(&cm_id_priv->lock); 2628 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2629 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2630 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2631 spin_unlock_irq(&cm_id_priv->lock); 2632 goto out; 2633 } 2634 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2635 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2636 cm_id_priv->msg = NULL; 2637 2638 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2639 if (!ret) 2640 list_add_tail(&work->list, &cm_id_priv->work_list); 2641 spin_unlock_irq(&cm_id_priv->lock); 2642 2643 if (ret) 2644 cm_process_work(cm_id_priv, work); 2645 else 2646 cm_deref_id(cm_id_priv); 2647 return 0; 2648 out: 2649 cm_deref_id(cm_id_priv); 2650 return -EINVAL; 2651 } 2652 2653 static int cm_timewait_handler(struct cm_work *work) 2654 { 2655 struct cm_timewait_info *timewait_info; 2656 struct cm_id_private *cm_id_priv; 2657 int ret; 2658 2659 timewait_info = (struct cm_timewait_info *)work; 2660 spin_lock_irq(&cm.lock); 2661 list_del(&timewait_info->list); 2662 spin_unlock_irq(&cm.lock); 2663 2664 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2665 timewait_info->work.remote_id); 2666 if (!cm_id_priv) 2667 return -EINVAL; 2668 2669 spin_lock_irq(&cm_id_priv->lock); 2670 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2671 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2672 spin_unlock_irq(&cm_id_priv->lock); 2673 goto out; 2674 } 2675 cm_id_priv->id.state = IB_CM_IDLE; 2676 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2677 if (!ret) 2678 list_add_tail(&work->list, &cm_id_priv->work_list); 2679 spin_unlock_irq(&cm_id_priv->lock); 2680 2681 if (ret) 2682 cm_process_work(cm_id_priv, work); 2683 else 2684 cm_deref_id(cm_id_priv); 2685 return 0; 2686 out: 2687 cm_deref_id(cm_id_priv); 2688 return -EINVAL; 2689 } 2690 2691 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2692 struct cm_id_private *cm_id_priv, 2693 struct ib_cm_sidr_req_param *param) 2694 { 2695 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2696 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2697 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2698 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey); 2699 sidr_req_msg->service_id = param->service_id; 2700 2701 if (param->private_data && param->private_data_len) 2702 memcpy(sidr_req_msg->private_data, param->private_data, 2703 param->private_data_len); 2704 } 2705 2706 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2707 struct ib_cm_sidr_req_param *param) 2708 { 2709 struct cm_id_private *cm_id_priv; 2710 struct ib_mad_send_buf *msg; 2711 unsigned long flags; 2712 int ret; 2713 2714 if (!param->path || (param->private_data && 2715 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2716 return -EINVAL; 2717 2718 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2719 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2720 if (ret) 2721 goto out; 2722 2723 cm_id->service_id = param->service_id; 2724 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2725 cm_id_priv->timeout_ms = param->timeout_ms; 2726 cm_id_priv->max_cm_retries = param->max_cm_retries; 2727 ret = cm_alloc_msg(cm_id_priv, &msg); 2728 if (ret) 2729 goto out; 2730 2731 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2732 param); 2733 msg->timeout_ms = cm_id_priv->timeout_ms; 2734 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2735 2736 spin_lock_irqsave(&cm_id_priv->lock, flags); 2737 if (cm_id->state == IB_CM_IDLE) 2738 ret = ib_post_send_mad(msg, NULL); 2739 else 2740 ret = -EINVAL; 2741 2742 if (ret) { 2743 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2744 cm_free_msg(msg); 2745 goto out; 2746 } 2747 cm_id->state = IB_CM_SIDR_REQ_SENT; 2748 cm_id_priv->msg = msg; 2749 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2750 out: 2751 return ret; 2752 } 2753 EXPORT_SYMBOL(ib_send_cm_sidr_req); 2754 2755 static void cm_format_sidr_req_event(struct cm_work *work, 2756 struct ib_cm_id *listen_id) 2757 { 2758 struct cm_sidr_req_msg *sidr_req_msg; 2759 struct ib_cm_sidr_req_event_param *param; 2760 2761 sidr_req_msg = (struct cm_sidr_req_msg *) 2762 work->mad_recv_wc->recv_buf.mad; 2763 param = &work->cm_event.param.sidr_req_rcvd; 2764 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2765 param->listen_id = listen_id; 2766 param->port = work->port->port_num; 2767 work->cm_event.private_data = &sidr_req_msg->private_data; 2768 } 2769 2770 static int cm_sidr_req_handler(struct cm_work *work) 2771 { 2772 struct ib_cm_id *cm_id; 2773 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2774 struct cm_sidr_req_msg *sidr_req_msg; 2775 struct ib_wc *wc; 2776 2777 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2778 if (IS_ERR(cm_id)) 2779 return PTR_ERR(cm_id); 2780 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2781 2782 /* Record SGID/SLID and request ID for lookup. */ 2783 sidr_req_msg = (struct cm_sidr_req_msg *) 2784 work->mad_recv_wc->recv_buf.mad; 2785 wc = work->mad_recv_wc->wc; 2786 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2787 cm_id_priv->av.dgid.global.interface_id = 0; 2788 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2789 work->mad_recv_wc->recv_buf.grh, 2790 &cm_id_priv->av); 2791 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2792 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2793 atomic_inc(&cm_id_priv->work_count); 2794 2795 spin_lock_irq(&cm.lock); 2796 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2797 if (cur_cm_id_priv) { 2798 spin_unlock_irq(&cm.lock); 2799 goto out; /* Duplicate message. */ 2800 } 2801 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2802 cur_cm_id_priv = cm_find_listen(cm_id->device, 2803 sidr_req_msg->service_id, 2804 sidr_req_msg->private_data); 2805 if (!cur_cm_id_priv) { 2806 spin_unlock_irq(&cm.lock); 2807 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2808 goto out; /* No match. */ 2809 } 2810 atomic_inc(&cur_cm_id_priv->refcount); 2811 spin_unlock_irq(&cm.lock); 2812 2813 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2814 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2815 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2816 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2817 2818 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2819 cm_process_work(cm_id_priv, work); 2820 cm_deref_id(cur_cm_id_priv); 2821 return 0; 2822 out: 2823 ib_destroy_cm_id(&cm_id_priv->id); 2824 return -EINVAL; 2825 } 2826 2827 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2828 struct cm_id_private *cm_id_priv, 2829 struct ib_cm_sidr_rep_param *param) 2830 { 2831 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2832 cm_id_priv->tid); 2833 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2834 sidr_rep_msg->status = param->status; 2835 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2836 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2837 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2838 2839 if (param->info && param->info_length) 2840 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2841 2842 if (param->private_data && param->private_data_len) 2843 memcpy(sidr_rep_msg->private_data, param->private_data, 2844 param->private_data_len); 2845 } 2846 2847 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2848 struct ib_cm_sidr_rep_param *param) 2849 { 2850 struct cm_id_private *cm_id_priv; 2851 struct ib_mad_send_buf *msg; 2852 unsigned long flags; 2853 int ret; 2854 2855 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2856 (param->private_data && 2857 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2858 return -EINVAL; 2859 2860 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2861 spin_lock_irqsave(&cm_id_priv->lock, flags); 2862 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2863 ret = -EINVAL; 2864 goto error; 2865 } 2866 2867 ret = cm_alloc_msg(cm_id_priv, &msg); 2868 if (ret) 2869 goto error; 2870 2871 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2872 param); 2873 ret = ib_post_send_mad(msg, NULL); 2874 if (ret) { 2875 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2876 cm_free_msg(msg); 2877 return ret; 2878 } 2879 cm_id->state = IB_CM_IDLE; 2880 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2881 2882 spin_lock_irqsave(&cm.lock, flags); 2883 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2884 spin_unlock_irqrestore(&cm.lock, flags); 2885 return 0; 2886 2887 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2888 return ret; 2889 } 2890 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2891 2892 static void cm_format_sidr_rep_event(struct cm_work *work) 2893 { 2894 struct cm_sidr_rep_msg *sidr_rep_msg; 2895 struct ib_cm_sidr_rep_event_param *param; 2896 2897 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2898 work->mad_recv_wc->recv_buf.mad; 2899 param = &work->cm_event.param.sidr_rep_rcvd; 2900 param->status = sidr_rep_msg->status; 2901 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2902 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2903 param->info = &sidr_rep_msg->info; 2904 param->info_len = sidr_rep_msg->info_length; 2905 work->cm_event.private_data = &sidr_rep_msg->private_data; 2906 } 2907 2908 static int cm_sidr_rep_handler(struct cm_work *work) 2909 { 2910 struct cm_sidr_rep_msg *sidr_rep_msg; 2911 struct cm_id_private *cm_id_priv; 2912 2913 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2914 work->mad_recv_wc->recv_buf.mad; 2915 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2916 if (!cm_id_priv) 2917 return -EINVAL; /* Unmatched reply. */ 2918 2919 spin_lock_irq(&cm_id_priv->lock); 2920 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2921 spin_unlock_irq(&cm_id_priv->lock); 2922 goto out; 2923 } 2924 cm_id_priv->id.state = IB_CM_IDLE; 2925 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2926 spin_unlock_irq(&cm_id_priv->lock); 2927 2928 cm_format_sidr_rep_event(work); 2929 cm_process_work(cm_id_priv, work); 2930 return 0; 2931 out: 2932 cm_deref_id(cm_id_priv); 2933 return -EINVAL; 2934 } 2935 2936 static void cm_process_send_error(struct ib_mad_send_buf *msg, 2937 enum ib_wc_status wc_status) 2938 { 2939 struct cm_id_private *cm_id_priv; 2940 struct ib_cm_event cm_event; 2941 enum ib_cm_state state; 2942 int ret; 2943 2944 memset(&cm_event, 0, sizeof cm_event); 2945 cm_id_priv = msg->context[0]; 2946 2947 /* Discard old sends or ones without a response. */ 2948 spin_lock_irq(&cm_id_priv->lock); 2949 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2950 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2951 goto discard; 2952 2953 switch (state) { 2954 case IB_CM_REQ_SENT: 2955 case IB_CM_MRA_REQ_RCVD: 2956 cm_reset_to_idle(cm_id_priv); 2957 cm_event.event = IB_CM_REQ_ERROR; 2958 break; 2959 case IB_CM_REP_SENT: 2960 case IB_CM_MRA_REP_RCVD: 2961 cm_reset_to_idle(cm_id_priv); 2962 cm_event.event = IB_CM_REP_ERROR; 2963 break; 2964 case IB_CM_DREQ_SENT: 2965 cm_enter_timewait(cm_id_priv); 2966 cm_event.event = IB_CM_DREQ_ERROR; 2967 break; 2968 case IB_CM_SIDR_REQ_SENT: 2969 cm_id_priv->id.state = IB_CM_IDLE; 2970 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2971 break; 2972 default: 2973 goto discard; 2974 } 2975 spin_unlock_irq(&cm_id_priv->lock); 2976 cm_event.param.send_status = wc_status; 2977 2978 /* No other events can occur on the cm_id at this point. */ 2979 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2980 cm_free_msg(msg); 2981 if (ret) 2982 ib_destroy_cm_id(&cm_id_priv->id); 2983 return; 2984 discard: 2985 spin_unlock_irq(&cm_id_priv->lock); 2986 cm_free_msg(msg); 2987 } 2988 2989 static void cm_send_handler(struct ib_mad_agent *mad_agent, 2990 struct ib_mad_send_wc *mad_send_wc) 2991 { 2992 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 2993 2994 switch (mad_send_wc->status) { 2995 case IB_WC_SUCCESS: 2996 case IB_WC_WR_FLUSH_ERR: 2997 cm_free_msg(msg); 2998 break; 2999 default: 3000 if (msg->context[0] && msg->context[1]) 3001 cm_process_send_error(msg, mad_send_wc->status); 3002 else 3003 cm_free_msg(msg); 3004 break; 3005 } 3006 } 3007 3008 static void cm_work_handler(struct work_struct *_work) 3009 { 3010 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3011 int ret; 3012 3013 switch (work->cm_event.event) { 3014 case IB_CM_REQ_RECEIVED: 3015 ret = cm_req_handler(work); 3016 break; 3017 case IB_CM_MRA_RECEIVED: 3018 ret = cm_mra_handler(work); 3019 break; 3020 case IB_CM_REJ_RECEIVED: 3021 ret = cm_rej_handler(work); 3022 break; 3023 case IB_CM_REP_RECEIVED: 3024 ret = cm_rep_handler(work); 3025 break; 3026 case IB_CM_RTU_RECEIVED: 3027 ret = cm_rtu_handler(work); 3028 break; 3029 case IB_CM_USER_ESTABLISHED: 3030 ret = cm_establish_handler(work); 3031 break; 3032 case IB_CM_DREQ_RECEIVED: 3033 ret = cm_dreq_handler(work); 3034 break; 3035 case IB_CM_DREP_RECEIVED: 3036 ret = cm_drep_handler(work); 3037 break; 3038 case IB_CM_SIDR_REQ_RECEIVED: 3039 ret = cm_sidr_req_handler(work); 3040 break; 3041 case IB_CM_SIDR_REP_RECEIVED: 3042 ret = cm_sidr_rep_handler(work); 3043 break; 3044 case IB_CM_LAP_RECEIVED: 3045 ret = cm_lap_handler(work); 3046 break; 3047 case IB_CM_APR_RECEIVED: 3048 ret = cm_apr_handler(work); 3049 break; 3050 case IB_CM_TIMEWAIT_EXIT: 3051 ret = cm_timewait_handler(work); 3052 break; 3053 default: 3054 ret = -EINVAL; 3055 break; 3056 } 3057 if (ret) 3058 cm_free_work(work); 3059 } 3060 3061 static int cm_establish(struct ib_cm_id *cm_id) 3062 { 3063 struct cm_id_private *cm_id_priv; 3064 struct cm_work *work; 3065 unsigned long flags; 3066 int ret = 0; 3067 3068 work = kmalloc(sizeof *work, GFP_ATOMIC); 3069 if (!work) 3070 return -ENOMEM; 3071 3072 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3073 spin_lock_irqsave(&cm_id_priv->lock, flags); 3074 switch (cm_id->state) 3075 { 3076 case IB_CM_REP_SENT: 3077 case IB_CM_MRA_REP_RCVD: 3078 cm_id->state = IB_CM_ESTABLISHED; 3079 break; 3080 case IB_CM_ESTABLISHED: 3081 ret = -EISCONN; 3082 break; 3083 default: 3084 ret = -EINVAL; 3085 break; 3086 } 3087 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3088 3089 if (ret) { 3090 kfree(work); 3091 goto out; 3092 } 3093 3094 /* 3095 * The CM worker thread may try to destroy the cm_id before it 3096 * can execute this work item. To prevent potential deadlock, 3097 * we need to find the cm_id once we're in the context of the 3098 * worker thread, rather than holding a reference on it. 3099 */ 3100 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3101 work->local_id = cm_id->local_id; 3102 work->remote_id = cm_id->remote_id; 3103 work->mad_recv_wc = NULL; 3104 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3105 queue_delayed_work(cm.wq, &work->work, 0); 3106 out: 3107 return ret; 3108 } 3109 3110 static int cm_migrate(struct ib_cm_id *cm_id) 3111 { 3112 struct cm_id_private *cm_id_priv; 3113 unsigned long flags; 3114 int ret = 0; 3115 3116 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3117 spin_lock_irqsave(&cm_id_priv->lock, flags); 3118 if (cm_id->state == IB_CM_ESTABLISHED && 3119 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3120 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3121 cm_id->lap_state = IB_CM_LAP_IDLE; 3122 cm_id_priv->av = cm_id_priv->alt_av; 3123 } else 3124 ret = -EINVAL; 3125 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3126 3127 return ret; 3128 } 3129 3130 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3131 { 3132 int ret; 3133 3134 switch (event) { 3135 case IB_EVENT_COMM_EST: 3136 ret = cm_establish(cm_id); 3137 break; 3138 case IB_EVENT_PATH_MIG: 3139 ret = cm_migrate(cm_id); 3140 break; 3141 default: 3142 ret = -EINVAL; 3143 } 3144 return ret; 3145 } 3146 EXPORT_SYMBOL(ib_cm_notify); 3147 3148 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3149 struct ib_mad_recv_wc *mad_recv_wc) 3150 { 3151 struct cm_work *work; 3152 enum ib_cm_event_type event; 3153 int paths = 0; 3154 3155 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3156 case CM_REQ_ATTR_ID: 3157 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3158 alt_local_lid != 0); 3159 event = IB_CM_REQ_RECEIVED; 3160 break; 3161 case CM_MRA_ATTR_ID: 3162 event = IB_CM_MRA_RECEIVED; 3163 break; 3164 case CM_REJ_ATTR_ID: 3165 event = IB_CM_REJ_RECEIVED; 3166 break; 3167 case CM_REP_ATTR_ID: 3168 event = IB_CM_REP_RECEIVED; 3169 break; 3170 case CM_RTU_ATTR_ID: 3171 event = IB_CM_RTU_RECEIVED; 3172 break; 3173 case CM_DREQ_ATTR_ID: 3174 event = IB_CM_DREQ_RECEIVED; 3175 break; 3176 case CM_DREP_ATTR_ID: 3177 event = IB_CM_DREP_RECEIVED; 3178 break; 3179 case CM_SIDR_REQ_ATTR_ID: 3180 event = IB_CM_SIDR_REQ_RECEIVED; 3181 break; 3182 case CM_SIDR_REP_ATTR_ID: 3183 event = IB_CM_SIDR_REP_RECEIVED; 3184 break; 3185 case CM_LAP_ATTR_ID: 3186 paths = 1; 3187 event = IB_CM_LAP_RECEIVED; 3188 break; 3189 case CM_APR_ATTR_ID: 3190 event = IB_CM_APR_RECEIVED; 3191 break; 3192 default: 3193 ib_free_recv_mad(mad_recv_wc); 3194 return; 3195 } 3196 3197 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3198 GFP_KERNEL); 3199 if (!work) { 3200 ib_free_recv_mad(mad_recv_wc); 3201 return; 3202 } 3203 3204 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3205 work->cm_event.event = event; 3206 work->mad_recv_wc = mad_recv_wc; 3207 work->port = (struct cm_port *)mad_agent->context; 3208 queue_delayed_work(cm.wq, &work->work, 0); 3209 } 3210 3211 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3212 struct ib_qp_attr *qp_attr, 3213 int *qp_attr_mask) 3214 { 3215 unsigned long flags; 3216 int ret; 3217 3218 spin_lock_irqsave(&cm_id_priv->lock, flags); 3219 switch (cm_id_priv->id.state) { 3220 case IB_CM_REQ_SENT: 3221 case IB_CM_MRA_REQ_RCVD: 3222 case IB_CM_REQ_RCVD: 3223 case IB_CM_MRA_REQ_SENT: 3224 case IB_CM_REP_RCVD: 3225 case IB_CM_MRA_REP_SENT: 3226 case IB_CM_REP_SENT: 3227 case IB_CM_MRA_REP_RCVD: 3228 case IB_CM_ESTABLISHED: 3229 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3230 IB_QP_PKEY_INDEX | IB_QP_PORT; 3231 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3232 if (cm_id_priv->responder_resources) 3233 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3234 IB_ACCESS_REMOTE_ATOMIC; 3235 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3236 qp_attr->port_num = cm_id_priv->av.port->port_num; 3237 ret = 0; 3238 break; 3239 default: 3240 ret = -EINVAL; 3241 break; 3242 } 3243 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3244 return ret; 3245 } 3246 3247 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3248 struct ib_qp_attr *qp_attr, 3249 int *qp_attr_mask) 3250 { 3251 unsigned long flags; 3252 int ret; 3253 3254 spin_lock_irqsave(&cm_id_priv->lock, flags); 3255 switch (cm_id_priv->id.state) { 3256 case IB_CM_REQ_RCVD: 3257 case IB_CM_MRA_REQ_SENT: 3258 case IB_CM_REP_RCVD: 3259 case IB_CM_MRA_REP_SENT: 3260 case IB_CM_REP_SENT: 3261 case IB_CM_MRA_REP_RCVD: 3262 case IB_CM_ESTABLISHED: 3263 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3264 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3265 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3266 qp_attr->path_mtu = cm_id_priv->path_mtu; 3267 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3268 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3269 if (cm_id_priv->qp_type == IB_QPT_RC) { 3270 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3271 IB_QP_MIN_RNR_TIMER; 3272 qp_attr->max_dest_rd_atomic = 3273 cm_id_priv->responder_resources; 3274 qp_attr->min_rnr_timer = 0; 3275 } 3276 if (cm_id_priv->alt_av.ah_attr.dlid) { 3277 *qp_attr_mask |= IB_QP_ALT_PATH; 3278 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3279 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3280 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3281 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3282 } 3283 ret = 0; 3284 break; 3285 default: 3286 ret = -EINVAL; 3287 break; 3288 } 3289 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3290 return ret; 3291 } 3292 3293 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3294 struct ib_qp_attr *qp_attr, 3295 int *qp_attr_mask) 3296 { 3297 unsigned long flags; 3298 int ret; 3299 3300 spin_lock_irqsave(&cm_id_priv->lock, flags); 3301 switch (cm_id_priv->id.state) { 3302 /* Allow transition to RTS before sending REP */ 3303 case IB_CM_REQ_RCVD: 3304 case IB_CM_MRA_REQ_SENT: 3305 3306 case IB_CM_REP_RCVD: 3307 case IB_CM_MRA_REP_SENT: 3308 case IB_CM_REP_SENT: 3309 case IB_CM_MRA_REP_RCVD: 3310 case IB_CM_ESTABLISHED: 3311 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3312 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3313 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3314 if (cm_id_priv->qp_type == IB_QPT_RC) { 3315 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3316 IB_QP_RNR_RETRY | 3317 IB_QP_MAX_QP_RD_ATOMIC; 3318 qp_attr->timeout = cm_id_priv->av.timeout; 3319 qp_attr->retry_cnt = cm_id_priv->retry_count; 3320 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3321 qp_attr->max_rd_atomic = 3322 cm_id_priv->initiator_depth; 3323 } 3324 if (cm_id_priv->alt_av.ah_attr.dlid) { 3325 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3326 qp_attr->path_mig_state = IB_MIG_REARM; 3327 } 3328 } else { 3329 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3330 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3331 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3332 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3333 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3334 qp_attr->path_mig_state = IB_MIG_REARM; 3335 } 3336 ret = 0; 3337 break; 3338 default: 3339 ret = -EINVAL; 3340 break; 3341 } 3342 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3343 return ret; 3344 } 3345 3346 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3347 struct ib_qp_attr *qp_attr, 3348 int *qp_attr_mask) 3349 { 3350 struct cm_id_private *cm_id_priv; 3351 int ret; 3352 3353 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3354 switch (qp_attr->qp_state) { 3355 case IB_QPS_INIT: 3356 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3357 break; 3358 case IB_QPS_RTR: 3359 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3360 break; 3361 case IB_QPS_RTS: 3362 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3363 break; 3364 default: 3365 ret = -EINVAL; 3366 break; 3367 } 3368 return ret; 3369 } 3370 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3371 3372 static void cm_get_ack_delay(struct cm_device *cm_dev) 3373 { 3374 struct ib_device_attr attr; 3375 3376 if (ib_query_device(cm_dev->device, &attr)) 3377 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3378 else 3379 cm_dev->ack_delay = attr.local_ca_ack_delay; 3380 } 3381 3382 static void cm_add_one(struct ib_device *device) 3383 { 3384 struct cm_device *cm_dev; 3385 struct cm_port *port; 3386 struct ib_mad_reg_req reg_req = { 3387 .mgmt_class = IB_MGMT_CLASS_CM, 3388 .mgmt_class_version = IB_CM_CLASS_VERSION 3389 }; 3390 struct ib_port_modify port_modify = { 3391 .set_port_cap_mask = IB_PORT_CM_SUP 3392 }; 3393 unsigned long flags; 3394 int ret; 3395 u8 i; 3396 3397 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3398 return; 3399 3400 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3401 device->phys_port_cnt, GFP_KERNEL); 3402 if (!cm_dev) 3403 return; 3404 3405 cm_dev->device = device; 3406 cm_get_ack_delay(cm_dev); 3407 3408 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3409 for (i = 1; i <= device->phys_port_cnt; i++) { 3410 port = &cm_dev->port[i-1]; 3411 port->cm_dev = cm_dev; 3412 port->port_num = i; 3413 port->mad_agent = ib_register_mad_agent(device, i, 3414 IB_QPT_GSI, 3415 ®_req, 3416 0, 3417 cm_send_handler, 3418 cm_recv_handler, 3419 port); 3420 if (IS_ERR(port->mad_agent)) 3421 goto error1; 3422 3423 ret = ib_modify_port(device, i, 0, &port_modify); 3424 if (ret) 3425 goto error2; 3426 } 3427 ib_set_client_data(device, &cm_client, cm_dev); 3428 3429 write_lock_irqsave(&cm.device_lock, flags); 3430 list_add_tail(&cm_dev->list, &cm.device_list); 3431 write_unlock_irqrestore(&cm.device_lock, flags); 3432 return; 3433 3434 error2: 3435 ib_unregister_mad_agent(port->mad_agent); 3436 error1: 3437 port_modify.set_port_cap_mask = 0; 3438 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3439 while (--i) { 3440 port = &cm_dev->port[i-1]; 3441 ib_modify_port(device, port->port_num, 0, &port_modify); 3442 ib_unregister_mad_agent(port->mad_agent); 3443 } 3444 kfree(cm_dev); 3445 } 3446 3447 static void cm_remove_one(struct ib_device *device) 3448 { 3449 struct cm_device *cm_dev; 3450 struct cm_port *port; 3451 struct ib_port_modify port_modify = { 3452 .clr_port_cap_mask = IB_PORT_CM_SUP 3453 }; 3454 unsigned long flags; 3455 int i; 3456 3457 cm_dev = ib_get_client_data(device, &cm_client); 3458 if (!cm_dev) 3459 return; 3460 3461 write_lock_irqsave(&cm.device_lock, flags); 3462 list_del(&cm_dev->list); 3463 write_unlock_irqrestore(&cm.device_lock, flags); 3464 3465 for (i = 1; i <= device->phys_port_cnt; i++) { 3466 port = &cm_dev->port[i-1]; 3467 ib_modify_port(device, port->port_num, 0, &port_modify); 3468 ib_unregister_mad_agent(port->mad_agent); 3469 } 3470 kfree(cm_dev); 3471 } 3472 3473 static int __init ib_cm_init(void) 3474 { 3475 int ret; 3476 3477 memset(&cm, 0, sizeof cm); 3478 INIT_LIST_HEAD(&cm.device_list); 3479 rwlock_init(&cm.device_lock); 3480 spin_lock_init(&cm.lock); 3481 cm.listen_service_table = RB_ROOT; 3482 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3483 cm.remote_id_table = RB_ROOT; 3484 cm.remote_qp_table = RB_ROOT; 3485 cm.remote_sidr_table = RB_ROOT; 3486 idr_init(&cm.local_id_table); 3487 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3488 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3489 INIT_LIST_HEAD(&cm.timewait_list); 3490 3491 cm.wq = create_workqueue("ib_cm"); 3492 if (!cm.wq) 3493 return -ENOMEM; 3494 3495 ret = ib_register_client(&cm_client); 3496 if (ret) 3497 goto error; 3498 3499 return 0; 3500 error: 3501 destroy_workqueue(cm.wq); 3502 return ret; 3503 } 3504 3505 static void __exit ib_cm_cleanup(void) 3506 { 3507 struct cm_timewait_info *timewait_info, *tmp; 3508 3509 spin_lock_irq(&cm.lock); 3510 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3511 cancel_delayed_work(&timewait_info->work.work); 3512 spin_unlock_irq(&cm.lock); 3513 3514 destroy_workqueue(cm.wq); 3515 3516 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3517 list_del(&timewait_info->list); 3518 kfree(timewait_info); 3519 } 3520 3521 ib_unregister_client(&cm_client); 3522 idr_destroy(&cm.local_id_table); 3523 } 3524 3525 module_init(ib_cm_init); 3526 module_exit(ib_cm_cleanup); 3527 3528