1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 5 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 6 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 8 * 9 * This software is available to you under a choice of one of two 10 * licenses. You may choose to be licensed under the terms of the GNU 11 * General Public License (GPL) Version 2, available from the file 12 * COPYING in the main directory of this source tree, or the 13 * OpenIB.org BSD license below: 14 * 15 * Redistribution and use in source and binary forms, with or 16 * without modification, are permitted provided that the following 17 * conditions are met: 18 * 19 * - Redistributions of source code must retain the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer. 22 * 23 * - Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials 26 * provided with the distribution. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 35 * SOFTWARE. 36 * 37 * $FreeBSD$ 38 */ 39 40 #include <linux/completion.h> 41 #include <linux/dma-mapping.h> 42 #include <linux/device.h> 43 #include <linux/module.h> 44 #include <linux/err.h> 45 #include <linux/idr.h> 46 #include <linux/interrupt.h> 47 #include <linux/random.h> 48 #include <linux/rbtree.h> 49 #include <linux/spinlock.h> 50 #include <linux/slab.h> 51 #include <linux/sysfs.h> 52 #include <linux/workqueue.h> 53 #include <linux/kdev_t.h> 54 #include <linux/etherdevice.h> 55 56 #include <asm/atomic-long.h> 57 58 #include <rdma/ib_cache.h> 59 #include <rdma/ib_cm.h> 60 #include "cm_msgs.h" 61 62 MODULE_AUTHOR("Sean Hefty"); 63 MODULE_DESCRIPTION("InfiniBand CM"); 64 MODULE_LICENSE("Dual BSD/GPL"); 65 66 static void cm_add_one(struct ib_device *device); 67 static void cm_remove_one(struct ib_device *device, void *client_data); 68 69 static struct ib_client cm_client = { 70 .name = "cm", 71 .add = cm_add_one, 72 .remove = cm_remove_one 73 }; 74 75 static struct ib_cm { 76 spinlock_t lock; 77 struct list_head device_list; 78 rwlock_t device_lock; 79 struct rb_root listen_service_table; 80 u64 listen_service_id; 81 /* struct rb_root peer_service_table; todo: fix peer to peer */ 82 struct rb_root remote_qp_table; 83 struct rb_root remote_id_table; 84 struct rb_root remote_sidr_table; 85 struct idr local_id_table; 86 __be32 random_id_operand; 87 struct list_head timewait_list; 88 struct workqueue_struct *wq; 89 /* Sync on cm change port state */ 90 spinlock_t state_lock; 91 } cm; 92 93 /* Counter indexes ordered by attribute ID */ 94 enum { 95 CM_REQ_COUNTER, 96 CM_MRA_COUNTER, 97 CM_REJ_COUNTER, 98 CM_REP_COUNTER, 99 CM_RTU_COUNTER, 100 CM_DREQ_COUNTER, 101 CM_DREP_COUNTER, 102 CM_SIDR_REQ_COUNTER, 103 CM_SIDR_REP_COUNTER, 104 CM_LAP_COUNTER, 105 CM_APR_COUNTER, 106 CM_ATTR_COUNT, 107 CM_ATTR_ID_OFFSET = 0x0010, 108 }; 109 110 enum { 111 CM_XMIT, 112 CM_XMIT_RETRIES, 113 CM_RECV, 114 CM_RECV_DUPLICATES, 115 CM_COUNTER_GROUPS 116 }; 117 118 static char const counter_group_names[CM_COUNTER_GROUPS] 119 [sizeof("cm_rx_duplicates")] = { 120 "cm_tx_msgs", "cm_tx_retries", 121 "cm_rx_msgs", "cm_rx_duplicates" 122 }; 123 124 struct cm_counter_group { 125 struct kobject obj; 126 atomic_long_t counter[CM_ATTR_COUNT]; 127 }; 128 129 struct cm_counter_attribute { 130 struct attribute attr; 131 int index; 132 }; 133 134 #define CM_COUNTER_ATTR(_name, _index) \ 135 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 136 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 137 .index = _index \ 138 } 139 140 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 141 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 142 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 143 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 144 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 145 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 146 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 147 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 148 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 149 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 150 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 151 152 static struct attribute *cm_counter_default_attrs[] = { 153 &cm_req_counter_attr.attr, 154 &cm_mra_counter_attr.attr, 155 &cm_rej_counter_attr.attr, 156 &cm_rep_counter_attr.attr, 157 &cm_rtu_counter_attr.attr, 158 &cm_dreq_counter_attr.attr, 159 &cm_drep_counter_attr.attr, 160 &cm_sidr_req_counter_attr.attr, 161 &cm_sidr_rep_counter_attr.attr, 162 &cm_lap_counter_attr.attr, 163 &cm_apr_counter_attr.attr, 164 NULL 165 }; 166 167 struct cm_port { 168 struct cm_device *cm_dev; 169 struct ib_mad_agent *mad_agent; 170 struct kobject port_obj; 171 u8 port_num; 172 struct list_head cm_priv_prim_list; 173 struct list_head cm_priv_altr_list; 174 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 175 }; 176 177 struct cm_device { 178 struct list_head list; 179 struct ib_device *ib_device; 180 struct device *device; 181 u8 ack_delay; 182 int going_down; 183 struct cm_port *port[0]; 184 }; 185 186 struct cm_av { 187 struct cm_port *port; 188 union ib_gid dgid; 189 struct ib_ah_attr ah_attr; 190 u16 pkey_index; 191 u8 timeout; 192 }; 193 194 struct cm_work { 195 struct delayed_work work; 196 struct list_head list; 197 struct cm_port *port; 198 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 199 __be32 local_id; /* Established / timewait */ 200 __be32 remote_id; 201 struct ib_cm_event cm_event; 202 struct ib_sa_path_rec path[0]; 203 }; 204 205 struct cm_timewait_info { 206 struct cm_work work; /* Must be first. */ 207 struct list_head list; 208 struct rb_node remote_qp_node; 209 struct rb_node remote_id_node; 210 __be64 remote_ca_guid; 211 __be32 remote_qpn; 212 u8 inserted_remote_qp; 213 u8 inserted_remote_id; 214 }; 215 216 struct cm_id_private { 217 struct ib_cm_id id; 218 219 struct rb_node service_node; 220 struct rb_node sidr_id_node; 221 spinlock_t lock; /* Do not acquire inside cm.lock */ 222 struct completion comp; 223 atomic_t refcount; 224 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 225 * Protected by the cm.lock spinlock. */ 226 int listen_sharecount; 227 228 struct ib_mad_send_buf *msg; 229 struct cm_timewait_info *timewait_info; 230 /* todo: use alternate port on send failure */ 231 struct cm_av av; 232 struct cm_av alt_av; 233 234 void *private_data; 235 __be64 tid; 236 __be32 local_qpn; 237 __be32 remote_qpn; 238 enum ib_qp_type qp_type; 239 __be32 sq_psn; 240 __be32 rq_psn; 241 int timeout_ms; 242 enum ib_mtu path_mtu; 243 __be16 pkey; 244 u8 private_data_len; 245 u8 max_cm_retries; 246 u8 peer_to_peer; 247 u8 responder_resources; 248 u8 initiator_depth; 249 u8 retry_count; 250 u8 rnr_retry_count; 251 u8 service_timeout; 252 u8 target_ack_delay; 253 254 struct list_head prim_list; 255 struct list_head altr_list; 256 /* Indicates that the send port mad is registered and av is set */ 257 int prim_send_port_not_ready; 258 int altr_send_port_not_ready; 259 260 struct list_head work_list; 261 atomic_t work_count; 262 }; 263 264 static void cm_work_handler(struct work_struct *work); 265 266 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 267 { 268 if (atomic_dec_and_test(&cm_id_priv->refcount)) 269 complete(&cm_id_priv->comp); 270 } 271 272 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 273 struct ib_mad_send_buf **msg) 274 { 275 struct ib_mad_agent *mad_agent; 276 struct ib_mad_send_buf *m; 277 struct ib_ah *ah; 278 struct cm_av *av; 279 unsigned long flags, flags2; 280 int ret = 0; 281 282 /* don't let the port to be released till the agent is down */ 283 spin_lock_irqsave(&cm.state_lock, flags2); 284 spin_lock_irqsave(&cm.lock, flags); 285 if (!cm_id_priv->prim_send_port_not_ready) 286 av = &cm_id_priv->av; 287 else if (!cm_id_priv->altr_send_port_not_ready && 288 (cm_id_priv->alt_av.port)) 289 av = &cm_id_priv->alt_av; 290 else { 291 pr_info("%s: not valid CM id\n", __func__); 292 ret = -ENODEV; 293 spin_unlock_irqrestore(&cm.lock, flags); 294 goto out; 295 } 296 spin_unlock_irqrestore(&cm.lock, flags); 297 /* Make sure the port haven't released the mad yet */ 298 mad_agent = cm_id_priv->av.port->mad_agent; 299 if (!mad_agent) { 300 pr_info("%s: not a valid MAD agent\n", __func__); 301 ret = -ENODEV; 302 goto out; 303 } 304 ah = ib_create_ah(mad_agent->qp->pd, &av->ah_attr); 305 if (IS_ERR(ah)) { 306 ret = PTR_ERR(ah); 307 goto out; 308 } 309 310 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 311 av->pkey_index, 312 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 313 GFP_ATOMIC, 314 IB_MGMT_BASE_VERSION); 315 if (IS_ERR(m)) { 316 ib_destroy_ah(ah); 317 ret = PTR_ERR(m); 318 goto out; 319 } 320 321 /* Timeout set by caller if response is expected. */ 322 m->ah = ah; 323 m->retries = cm_id_priv->max_cm_retries; 324 325 atomic_inc(&cm_id_priv->refcount); 326 m->context[0] = cm_id_priv; 327 *msg = m; 328 329 out: 330 spin_unlock_irqrestore(&cm.state_lock, flags2); 331 return ret; 332 } 333 334 static int cm_alloc_response_msg(struct cm_port *port, 335 struct ib_mad_recv_wc *mad_recv_wc, 336 struct ib_mad_send_buf **msg) 337 { 338 struct ib_mad_send_buf *m; 339 struct ib_ah *ah; 340 341 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 342 mad_recv_wc->recv_buf.grh, port->port_num); 343 if (IS_ERR(ah)) 344 return PTR_ERR(ah); 345 346 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 347 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 348 GFP_ATOMIC, 349 IB_MGMT_BASE_VERSION); 350 if (IS_ERR(m)) { 351 ib_destroy_ah(ah); 352 return PTR_ERR(m); 353 } 354 m->ah = ah; 355 *msg = m; 356 return 0; 357 } 358 359 static void cm_free_msg(struct ib_mad_send_buf *msg) 360 { 361 ib_destroy_ah(msg->ah); 362 if (msg->context[0]) 363 cm_deref_id(msg->context[0]); 364 ib_free_send_mad(msg); 365 } 366 367 static void * cm_copy_private_data(const void *private_data, 368 u8 private_data_len) 369 { 370 void *data; 371 372 if (!private_data || !private_data_len) 373 return NULL; 374 375 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 376 if (!data) 377 return ERR_PTR(-ENOMEM); 378 379 return data; 380 } 381 382 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 383 void *private_data, u8 private_data_len) 384 { 385 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 386 kfree(cm_id_priv->private_data); 387 388 cm_id_priv->private_data = private_data; 389 cm_id_priv->private_data_len = private_data_len; 390 } 391 392 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 393 struct ib_grh *grh, struct cm_av *av) 394 { 395 av->port = port; 396 av->pkey_index = wc->pkey_index; 397 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 398 grh, &av->ah_attr); 399 } 400 401 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av, 402 struct cm_id_private *cm_id_priv) 403 { 404 struct cm_device *cm_dev; 405 struct cm_port *port = NULL; 406 unsigned long flags; 407 int ret; 408 u8 p; 409 struct net_device *ndev = ib_get_ndev_from_path(path); 410 411 read_lock_irqsave(&cm.device_lock, flags); 412 list_for_each_entry(cm_dev, &cm.device_list, list) { 413 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 414 path->gid_type, ndev, &p, NULL)) { 415 port = cm_dev->port[p-1]; 416 break; 417 } 418 } 419 read_unlock_irqrestore(&cm.device_lock, flags); 420 421 if (ndev) 422 dev_put(ndev); 423 424 if (!port) 425 return -EINVAL; 426 427 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 428 be16_to_cpu(path->pkey), &av->pkey_index); 429 if (ret) 430 return ret; 431 432 av->port = port; 433 ret = ib_init_ah_from_path(cm_dev->ib_device, port->port_num, 434 path, &av->ah_attr); 435 if (ret) 436 return ret; 437 438 av->timeout = path->packet_life_time + 1; 439 440 spin_lock_irqsave(&cm.lock, flags); 441 if (&cm_id_priv->av == av) 442 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 443 else if (&cm_id_priv->alt_av == av) 444 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 445 else 446 ret = -EINVAL; 447 448 spin_unlock_irqrestore(&cm.lock, flags); 449 450 return ret; 451 } 452 453 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 454 { 455 unsigned long flags; 456 int id; 457 458 idr_preload(GFP_KERNEL); 459 spin_lock_irqsave(&cm.lock, flags); 460 461 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 462 463 spin_unlock_irqrestore(&cm.lock, flags); 464 idr_preload_end(); 465 466 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 467 return id < 0 ? id : 0; 468 } 469 470 static void cm_free_id(__be32 local_id) 471 { 472 spin_lock_irq(&cm.lock); 473 idr_remove(&cm.local_id_table, 474 (__force int) (local_id ^ cm.random_id_operand)); 475 spin_unlock_irq(&cm.lock); 476 } 477 478 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 479 { 480 struct cm_id_private *cm_id_priv; 481 482 cm_id_priv = idr_find(&cm.local_id_table, 483 (__force int) (local_id ^ cm.random_id_operand)); 484 if (cm_id_priv) { 485 if (cm_id_priv->id.remote_id == remote_id) 486 atomic_inc(&cm_id_priv->refcount); 487 else 488 cm_id_priv = NULL; 489 } 490 491 return cm_id_priv; 492 } 493 494 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 495 { 496 struct cm_id_private *cm_id_priv; 497 498 spin_lock_irq(&cm.lock); 499 cm_id_priv = cm_get_id(local_id, remote_id); 500 spin_unlock_irq(&cm.lock); 501 502 return cm_id_priv; 503 } 504 505 /* 506 * Trivial helpers to strip endian annotation and compare; the 507 * endianness doesn't actually matter since we just need a stable 508 * order for the RB tree. 509 */ 510 static int be32_lt(__be32 a, __be32 b) 511 { 512 return (__force u32) a < (__force u32) b; 513 } 514 515 static int be32_gt(__be32 a, __be32 b) 516 { 517 return (__force u32) a > (__force u32) b; 518 } 519 520 static int be64_lt(__be64 a, __be64 b) 521 { 522 return (__force u64) a < (__force u64) b; 523 } 524 525 static int be64_gt(__be64 a, __be64 b) 526 { 527 return (__force u64) a > (__force u64) b; 528 } 529 530 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 531 { 532 struct rb_node **link = &cm.listen_service_table.rb_node; 533 struct rb_node *parent = NULL; 534 struct cm_id_private *cur_cm_id_priv; 535 __be64 service_id = cm_id_priv->id.service_id; 536 __be64 service_mask = cm_id_priv->id.service_mask; 537 538 while (*link) { 539 parent = *link; 540 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 541 service_node); 542 if ((cur_cm_id_priv->id.service_mask & service_id) == 543 (service_mask & cur_cm_id_priv->id.service_id) && 544 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 545 return cur_cm_id_priv; 546 547 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 548 link = &(*link)->rb_left; 549 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 550 link = &(*link)->rb_right; 551 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 552 link = &(*link)->rb_left; 553 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 554 link = &(*link)->rb_right; 555 else 556 link = &(*link)->rb_right; 557 } 558 rb_link_node(&cm_id_priv->service_node, parent, link); 559 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 560 return NULL; 561 } 562 563 static struct cm_id_private * cm_find_listen(struct ib_device *device, 564 __be64 service_id) 565 { 566 struct rb_node *node = cm.listen_service_table.rb_node; 567 struct cm_id_private *cm_id_priv; 568 569 while (node) { 570 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 571 if ((cm_id_priv->id.service_mask & service_id) == 572 cm_id_priv->id.service_id && 573 (cm_id_priv->id.device == device)) 574 return cm_id_priv; 575 576 if (device < cm_id_priv->id.device) 577 node = node->rb_left; 578 else if (device > cm_id_priv->id.device) 579 node = node->rb_right; 580 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 581 node = node->rb_left; 582 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 583 node = node->rb_right; 584 else 585 node = node->rb_right; 586 } 587 return NULL; 588 } 589 590 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 591 *timewait_info) 592 { 593 struct rb_node **link = &cm.remote_id_table.rb_node; 594 struct rb_node *parent = NULL; 595 struct cm_timewait_info *cur_timewait_info; 596 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 597 __be32 remote_id = timewait_info->work.remote_id; 598 599 while (*link) { 600 parent = *link; 601 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 602 remote_id_node); 603 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 604 link = &(*link)->rb_left; 605 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 606 link = &(*link)->rb_right; 607 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 608 link = &(*link)->rb_left; 609 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 610 link = &(*link)->rb_right; 611 else 612 return cur_timewait_info; 613 } 614 timewait_info->inserted_remote_id = 1; 615 rb_link_node(&timewait_info->remote_id_node, parent, link); 616 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 617 return NULL; 618 } 619 620 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 621 __be32 remote_id) 622 { 623 struct rb_node *node = cm.remote_id_table.rb_node; 624 struct cm_timewait_info *timewait_info; 625 626 while (node) { 627 timewait_info = rb_entry(node, struct cm_timewait_info, 628 remote_id_node); 629 if (be32_lt(remote_id, timewait_info->work.remote_id)) 630 node = node->rb_left; 631 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 632 node = node->rb_right; 633 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 634 node = node->rb_left; 635 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 636 node = node->rb_right; 637 else 638 return timewait_info; 639 } 640 return NULL; 641 } 642 643 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 644 *timewait_info) 645 { 646 struct rb_node **link = &cm.remote_qp_table.rb_node; 647 struct rb_node *parent = NULL; 648 struct cm_timewait_info *cur_timewait_info; 649 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 650 __be32 remote_qpn = timewait_info->remote_qpn; 651 652 while (*link) { 653 parent = *link; 654 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 655 remote_qp_node); 656 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 657 link = &(*link)->rb_left; 658 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 659 link = &(*link)->rb_right; 660 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 661 link = &(*link)->rb_left; 662 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 663 link = &(*link)->rb_right; 664 else 665 return cur_timewait_info; 666 } 667 timewait_info->inserted_remote_qp = 1; 668 rb_link_node(&timewait_info->remote_qp_node, parent, link); 669 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 670 return NULL; 671 } 672 673 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 674 *cm_id_priv) 675 { 676 struct rb_node **link = &cm.remote_sidr_table.rb_node; 677 struct rb_node *parent = NULL; 678 struct cm_id_private *cur_cm_id_priv; 679 union ib_gid *port_gid = &cm_id_priv->av.dgid; 680 __be32 remote_id = cm_id_priv->id.remote_id; 681 682 while (*link) { 683 parent = *link; 684 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 685 sidr_id_node); 686 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 687 link = &(*link)->rb_left; 688 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 689 link = &(*link)->rb_right; 690 else { 691 int cmp; 692 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 693 sizeof *port_gid); 694 if (cmp < 0) 695 link = &(*link)->rb_left; 696 else if (cmp > 0) 697 link = &(*link)->rb_right; 698 else 699 return cur_cm_id_priv; 700 } 701 } 702 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 703 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 704 return NULL; 705 } 706 707 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 708 enum ib_cm_sidr_status status) 709 { 710 struct ib_cm_sidr_rep_param param; 711 712 memset(¶m, 0, sizeof param); 713 param.status = status; 714 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 715 } 716 717 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 718 ib_cm_handler cm_handler, 719 void *context) 720 { 721 struct cm_id_private *cm_id_priv; 722 int ret; 723 724 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 725 if (!cm_id_priv) 726 return ERR_PTR(-ENOMEM); 727 728 cm_id_priv->id.state = IB_CM_IDLE; 729 cm_id_priv->id.device = device; 730 cm_id_priv->id.cm_handler = cm_handler; 731 cm_id_priv->id.context = context; 732 cm_id_priv->id.remote_cm_qpn = 1; 733 ret = cm_alloc_id(cm_id_priv); 734 if (ret) 735 goto error; 736 737 spin_lock_init(&cm_id_priv->lock); 738 init_completion(&cm_id_priv->comp); 739 INIT_LIST_HEAD(&cm_id_priv->work_list); 740 INIT_LIST_HEAD(&cm_id_priv->prim_list); 741 INIT_LIST_HEAD(&cm_id_priv->altr_list); 742 atomic_set(&cm_id_priv->work_count, -1); 743 atomic_set(&cm_id_priv->refcount, 1); 744 return &cm_id_priv->id; 745 746 error: 747 kfree(cm_id_priv); 748 return ERR_PTR(-ENOMEM); 749 } 750 EXPORT_SYMBOL(ib_create_cm_id); 751 752 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 753 { 754 struct cm_work *work; 755 756 if (list_empty(&cm_id_priv->work_list)) 757 return NULL; 758 759 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 760 list_del(&work->list); 761 return work; 762 } 763 764 static void cm_free_work(struct cm_work *work) 765 { 766 if (work->mad_recv_wc) 767 ib_free_recv_mad(work->mad_recv_wc); 768 kfree(work); 769 } 770 771 static inline int cm_convert_to_ms(int iba_time) 772 { 773 /* approximate conversion to ms from 4.096us x 2^iba_time */ 774 return 1 << max(iba_time - 8, 0); 775 } 776 777 /* 778 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 779 * Because of how ack_timeout is stored, adding one doubles the timeout. 780 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 781 * increment it (round up) only if the other is within 50%. 782 */ 783 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 784 { 785 int ack_timeout = packet_life_time + 1; 786 787 if (ack_timeout >= ca_ack_delay) 788 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 789 else 790 ack_timeout = ca_ack_delay + 791 (ack_timeout >= (ca_ack_delay - 1)); 792 793 return min(31, ack_timeout); 794 } 795 796 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 797 { 798 if (timewait_info->inserted_remote_id) { 799 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 800 timewait_info->inserted_remote_id = 0; 801 } 802 803 if (timewait_info->inserted_remote_qp) { 804 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 805 timewait_info->inserted_remote_qp = 0; 806 } 807 } 808 809 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 810 { 811 struct cm_timewait_info *timewait_info; 812 813 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 814 if (!timewait_info) 815 return ERR_PTR(-ENOMEM); 816 817 timewait_info->work.local_id = local_id; 818 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 819 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 820 return timewait_info; 821 } 822 823 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 824 { 825 int wait_time; 826 unsigned long flags; 827 struct cm_device *cm_dev; 828 829 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 830 if (!cm_dev) 831 return; 832 833 spin_lock_irqsave(&cm.lock, flags); 834 cm_cleanup_timewait(cm_id_priv->timewait_info); 835 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 836 spin_unlock_irqrestore(&cm.lock, flags); 837 838 /* 839 * The cm_id could be destroyed by the user before we exit timewait. 840 * To protect against this, we search for the cm_id after exiting 841 * timewait before notifying the user that we've exited timewait. 842 */ 843 cm_id_priv->id.state = IB_CM_TIMEWAIT; 844 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 845 846 /* Check if the device started its remove_one */ 847 spin_lock_irqsave(&cm.lock, flags); 848 if (!cm_dev->going_down) 849 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 850 msecs_to_jiffies(wait_time)); 851 spin_unlock_irqrestore(&cm.lock, flags); 852 853 cm_id_priv->timewait_info = NULL; 854 } 855 856 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 857 { 858 unsigned long flags; 859 860 cm_id_priv->id.state = IB_CM_IDLE; 861 if (cm_id_priv->timewait_info) { 862 spin_lock_irqsave(&cm.lock, flags); 863 cm_cleanup_timewait(cm_id_priv->timewait_info); 864 spin_unlock_irqrestore(&cm.lock, flags); 865 kfree(cm_id_priv->timewait_info); 866 cm_id_priv->timewait_info = NULL; 867 } 868 } 869 870 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 871 { 872 struct cm_id_private *cm_id_priv; 873 struct cm_work *work; 874 875 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 876 retest: 877 spin_lock_irq(&cm_id_priv->lock); 878 switch (cm_id->state) { 879 case IB_CM_LISTEN: 880 spin_unlock_irq(&cm_id_priv->lock); 881 882 spin_lock_irq(&cm.lock); 883 if (--cm_id_priv->listen_sharecount > 0) { 884 /* The id is still shared. */ 885 cm_deref_id(cm_id_priv); 886 spin_unlock_irq(&cm.lock); 887 return; 888 } 889 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 890 spin_unlock_irq(&cm.lock); 891 break; 892 case IB_CM_SIDR_REQ_SENT: 893 cm_id->state = IB_CM_IDLE; 894 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 895 spin_unlock_irq(&cm_id_priv->lock); 896 break; 897 case IB_CM_SIDR_REQ_RCVD: 898 spin_unlock_irq(&cm_id_priv->lock); 899 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 900 spin_lock_irq(&cm.lock); 901 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 902 rb_erase(&cm_id_priv->sidr_id_node, 903 &cm.remote_sidr_table); 904 spin_unlock_irq(&cm.lock); 905 break; 906 case IB_CM_REQ_SENT: 907 case IB_CM_MRA_REQ_RCVD: 908 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 909 spin_unlock_irq(&cm_id_priv->lock); 910 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 911 &cm_id_priv->id.device->node_guid, 912 sizeof cm_id_priv->id.device->node_guid, 913 NULL, 0); 914 break; 915 case IB_CM_REQ_RCVD: 916 if (err == -ENOMEM) { 917 /* Do not reject to allow future retries. */ 918 cm_reset_to_idle(cm_id_priv); 919 spin_unlock_irq(&cm_id_priv->lock); 920 } else { 921 spin_unlock_irq(&cm_id_priv->lock); 922 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 923 NULL, 0, NULL, 0); 924 } 925 break; 926 case IB_CM_REP_SENT: 927 case IB_CM_MRA_REP_RCVD: 928 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 929 /* Fall through */ 930 case IB_CM_MRA_REQ_SENT: 931 case IB_CM_REP_RCVD: 932 case IB_CM_MRA_REP_SENT: 933 spin_unlock_irq(&cm_id_priv->lock); 934 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 935 NULL, 0, NULL, 0); 936 break; 937 case IB_CM_ESTABLISHED: 938 spin_unlock_irq(&cm_id_priv->lock); 939 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 940 break; 941 ib_send_cm_dreq(cm_id, NULL, 0); 942 goto retest; 943 case IB_CM_DREQ_SENT: 944 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 945 cm_enter_timewait(cm_id_priv); 946 spin_unlock_irq(&cm_id_priv->lock); 947 break; 948 case IB_CM_DREQ_RCVD: 949 spin_unlock_irq(&cm_id_priv->lock); 950 ib_send_cm_drep(cm_id, NULL, 0); 951 break; 952 default: 953 spin_unlock_irq(&cm_id_priv->lock); 954 break; 955 } 956 957 spin_lock_irq(&cm.lock); 958 if (!list_empty(&cm_id_priv->altr_list) && 959 (!cm_id_priv->altr_send_port_not_ready)) 960 list_del(&cm_id_priv->altr_list); 961 if (!list_empty(&cm_id_priv->prim_list) && 962 (!cm_id_priv->prim_send_port_not_ready)) 963 list_del(&cm_id_priv->prim_list); 964 spin_unlock_irq(&cm.lock); 965 966 cm_free_id(cm_id->local_id); 967 cm_deref_id(cm_id_priv); 968 wait_for_completion(&cm_id_priv->comp); 969 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 970 cm_free_work(work); 971 kfree(cm_id_priv->private_data); 972 kfree(cm_id_priv); 973 } 974 975 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 976 { 977 cm_destroy_id(cm_id, 0); 978 } 979 EXPORT_SYMBOL(ib_destroy_cm_id); 980 981 /** 982 * __ib_cm_listen - Initiates listening on the specified service ID for 983 * connection and service ID resolution requests. 984 * @cm_id: Connection identifier associated with the listen request. 985 * @service_id: Service identifier matched against incoming connection 986 * and service ID resolution requests. The service ID should be specified 987 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 988 * assign a service ID to the caller. 989 * @service_mask: Mask applied to service ID used to listen across a 990 * range of service IDs. If set to 0, the service ID is matched 991 * exactly. This parameter is ignored if %service_id is set to 992 * IB_CM_ASSIGN_SERVICE_ID. 993 */ 994 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 995 __be64 service_mask) 996 { 997 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 998 int ret = 0; 999 1000 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1001 service_id &= service_mask; 1002 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1003 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1004 return -EINVAL; 1005 1006 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1007 if (cm_id->state != IB_CM_IDLE) 1008 return -EINVAL; 1009 1010 cm_id->state = IB_CM_LISTEN; 1011 ++cm_id_priv->listen_sharecount; 1012 1013 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1014 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1015 cm_id->service_mask = ~cpu_to_be64(0); 1016 } else { 1017 cm_id->service_id = service_id; 1018 cm_id->service_mask = service_mask; 1019 } 1020 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1021 1022 if (cur_cm_id_priv) { 1023 cm_id->state = IB_CM_IDLE; 1024 --cm_id_priv->listen_sharecount; 1025 ret = -EBUSY; 1026 } 1027 return ret; 1028 } 1029 1030 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1031 { 1032 unsigned long flags; 1033 int ret; 1034 1035 spin_lock_irqsave(&cm.lock, flags); 1036 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1037 spin_unlock_irqrestore(&cm.lock, flags); 1038 1039 return ret; 1040 } 1041 EXPORT_SYMBOL(ib_cm_listen); 1042 1043 /** 1044 * Create a new listening ib_cm_id and listen on the given service ID. 1045 * 1046 * If there's an existing ID listening on that same device and service ID, 1047 * return it. 1048 * 1049 * @device: Device associated with the cm_id. All related communication will 1050 * be associated with the specified device. 1051 * @cm_handler: Callback invoked to notify the user of CM events. 1052 * @service_id: Service identifier matched against incoming connection 1053 * and service ID resolution requests. The service ID should be specified 1054 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1055 * assign a service ID to the caller. 1056 * 1057 * Callers should call ib_destroy_cm_id when done with the listener ID. 1058 */ 1059 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1060 ib_cm_handler cm_handler, 1061 __be64 service_id) 1062 { 1063 struct cm_id_private *cm_id_priv; 1064 struct ib_cm_id *cm_id; 1065 unsigned long flags; 1066 int err = 0; 1067 1068 /* Create an ID in advance, since the creation may sleep */ 1069 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1070 if (IS_ERR(cm_id)) 1071 return cm_id; 1072 1073 spin_lock_irqsave(&cm.lock, flags); 1074 1075 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1076 goto new_id; 1077 1078 /* Find an existing ID */ 1079 cm_id_priv = cm_find_listen(device, service_id); 1080 if (cm_id_priv) { 1081 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1082 /* Sharing an ib_cm_id with different handlers is not 1083 * supported */ 1084 spin_unlock_irqrestore(&cm.lock, flags); 1085 return ERR_PTR(-EINVAL); 1086 } 1087 atomic_inc(&cm_id_priv->refcount); 1088 ++cm_id_priv->listen_sharecount; 1089 spin_unlock_irqrestore(&cm.lock, flags); 1090 1091 ib_destroy_cm_id(cm_id); 1092 cm_id = &cm_id_priv->id; 1093 return cm_id; 1094 } 1095 1096 new_id: 1097 /* Use newly created ID */ 1098 err = __ib_cm_listen(cm_id, service_id, 0); 1099 1100 spin_unlock_irqrestore(&cm.lock, flags); 1101 1102 if (err) { 1103 ib_destroy_cm_id(cm_id); 1104 return ERR_PTR(err); 1105 } 1106 return cm_id; 1107 } 1108 EXPORT_SYMBOL(ib_cm_insert_listen); 1109 1110 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1111 enum cm_msg_sequence msg_seq) 1112 { 1113 u64 hi_tid, low_tid; 1114 1115 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1116 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1117 (msg_seq << 30)); 1118 return cpu_to_be64(hi_tid | low_tid); 1119 } 1120 1121 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1122 __be16 attr_id, __be64 tid) 1123 { 1124 hdr->base_version = IB_MGMT_BASE_VERSION; 1125 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1126 hdr->class_version = IB_CM_CLASS_VERSION; 1127 hdr->method = IB_MGMT_METHOD_SEND; 1128 hdr->attr_id = attr_id; 1129 hdr->tid = tid; 1130 } 1131 1132 static void cm_format_req(struct cm_req_msg *req_msg, 1133 struct cm_id_private *cm_id_priv, 1134 struct ib_cm_req_param *param) 1135 { 1136 struct ib_sa_path_rec *pri_path = param->primary_path; 1137 struct ib_sa_path_rec *alt_path = param->alternate_path; 1138 1139 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1140 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1141 1142 req_msg->local_comm_id = cm_id_priv->id.local_id; 1143 req_msg->service_id = param->service_id; 1144 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1145 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1146 cm_req_set_init_depth(req_msg, param->initiator_depth); 1147 cm_req_set_remote_resp_timeout(req_msg, 1148 param->remote_cm_response_timeout); 1149 cm_req_set_qp_type(req_msg, param->qp_type); 1150 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1151 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1152 cm_req_set_local_resp_timeout(req_msg, 1153 param->local_cm_response_timeout); 1154 req_msg->pkey = param->primary_path->pkey; 1155 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1156 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1157 1158 if (param->qp_type != IB_QPT_XRC_INI) { 1159 cm_req_set_resp_res(req_msg, param->responder_resources); 1160 cm_req_set_retry_count(req_msg, param->retry_count); 1161 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1162 cm_req_set_srq(req_msg, param->srq); 1163 } 1164 1165 if (pri_path->hop_limit <= 1) { 1166 req_msg->primary_local_lid = pri_path->slid; 1167 req_msg->primary_remote_lid = pri_path->dlid; 1168 } else { 1169 /* Work-around until there's a way to obtain remote LID info */ 1170 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1171 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1172 } 1173 req_msg->primary_local_gid = pri_path->sgid; 1174 req_msg->primary_remote_gid = pri_path->dgid; 1175 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1176 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1177 req_msg->primary_traffic_class = pri_path->traffic_class; 1178 req_msg->primary_hop_limit = pri_path->hop_limit; 1179 cm_req_set_primary_sl(req_msg, pri_path->sl); 1180 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1181 cm_req_set_primary_local_ack_timeout(req_msg, 1182 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1183 pri_path->packet_life_time)); 1184 1185 if (alt_path) { 1186 if (alt_path->hop_limit <= 1) { 1187 req_msg->alt_local_lid = alt_path->slid; 1188 req_msg->alt_remote_lid = alt_path->dlid; 1189 } else { 1190 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1191 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1192 } 1193 req_msg->alt_local_gid = alt_path->sgid; 1194 req_msg->alt_remote_gid = alt_path->dgid; 1195 cm_req_set_alt_flow_label(req_msg, 1196 alt_path->flow_label); 1197 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1198 req_msg->alt_traffic_class = alt_path->traffic_class; 1199 req_msg->alt_hop_limit = alt_path->hop_limit; 1200 cm_req_set_alt_sl(req_msg, alt_path->sl); 1201 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1202 cm_req_set_alt_local_ack_timeout(req_msg, 1203 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1204 alt_path->packet_life_time)); 1205 } 1206 1207 if (param->private_data && param->private_data_len) 1208 memcpy(req_msg->private_data, param->private_data, 1209 param->private_data_len); 1210 } 1211 1212 static int cm_validate_req_param(struct ib_cm_req_param *param) 1213 { 1214 /* peer-to-peer not supported */ 1215 if (param->peer_to_peer) 1216 return -EINVAL; 1217 1218 if (!param->primary_path) 1219 return -EINVAL; 1220 1221 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1222 param->qp_type != IB_QPT_XRC_INI) 1223 return -EINVAL; 1224 1225 if (param->private_data && 1226 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1227 return -EINVAL; 1228 1229 if (param->alternate_path && 1230 (param->alternate_path->pkey != param->primary_path->pkey || 1231 param->alternate_path->mtu != param->primary_path->mtu)) 1232 return -EINVAL; 1233 1234 return 0; 1235 } 1236 1237 int ib_send_cm_req(struct ib_cm_id *cm_id, 1238 struct ib_cm_req_param *param) 1239 { 1240 struct cm_id_private *cm_id_priv; 1241 struct cm_req_msg *req_msg; 1242 unsigned long flags; 1243 int ret; 1244 1245 ret = cm_validate_req_param(param); 1246 if (ret) 1247 return ret; 1248 1249 /* Verify that we're not in timewait. */ 1250 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1251 spin_lock_irqsave(&cm_id_priv->lock, flags); 1252 if (cm_id->state != IB_CM_IDLE) { 1253 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1254 ret = -EINVAL; 1255 goto out; 1256 } 1257 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1258 1259 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1260 id.local_id); 1261 if (IS_ERR(cm_id_priv->timewait_info)) { 1262 ret = PTR_ERR(cm_id_priv->timewait_info); 1263 goto out; 1264 } 1265 1266 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av, 1267 cm_id_priv); 1268 if (ret) 1269 goto error1; 1270 if (param->alternate_path) { 1271 ret = cm_init_av_by_path(param->alternate_path, 1272 &cm_id_priv->alt_av, cm_id_priv); 1273 if (ret) 1274 goto error1; 1275 } 1276 cm_id->service_id = param->service_id; 1277 cm_id->service_mask = ~cpu_to_be64(0); 1278 cm_id_priv->timeout_ms = cm_convert_to_ms( 1279 param->primary_path->packet_life_time) * 2 + 1280 cm_convert_to_ms( 1281 param->remote_cm_response_timeout); 1282 cm_id_priv->max_cm_retries = param->max_cm_retries; 1283 cm_id_priv->initiator_depth = param->initiator_depth; 1284 cm_id_priv->responder_resources = param->responder_resources; 1285 cm_id_priv->retry_count = param->retry_count; 1286 cm_id_priv->path_mtu = param->primary_path->mtu; 1287 cm_id_priv->pkey = param->primary_path->pkey; 1288 cm_id_priv->qp_type = param->qp_type; 1289 1290 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1291 if (ret) 1292 goto error1; 1293 1294 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1295 cm_format_req(req_msg, cm_id_priv, param); 1296 cm_id_priv->tid = req_msg->hdr.tid; 1297 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1298 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1299 1300 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1301 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1302 1303 spin_lock_irqsave(&cm_id_priv->lock, flags); 1304 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1305 if (ret) { 1306 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1307 goto error2; 1308 } 1309 BUG_ON(cm_id->state != IB_CM_IDLE); 1310 cm_id->state = IB_CM_REQ_SENT; 1311 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1312 return 0; 1313 1314 error2: cm_free_msg(cm_id_priv->msg); 1315 error1: kfree(cm_id_priv->timewait_info); 1316 out: return ret; 1317 } 1318 EXPORT_SYMBOL(ib_send_cm_req); 1319 1320 static int cm_issue_rej(struct cm_port *port, 1321 struct ib_mad_recv_wc *mad_recv_wc, 1322 enum ib_cm_rej_reason reason, 1323 enum cm_msg_response msg_rejected, 1324 void *ari, u8 ari_length) 1325 { 1326 struct ib_mad_send_buf *msg = NULL; 1327 struct cm_rej_msg *rej_msg, *rcv_msg; 1328 int ret; 1329 1330 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1331 if (ret) 1332 return ret; 1333 1334 /* We just need common CM header information. Cast to any message. */ 1335 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1336 rej_msg = (struct cm_rej_msg *) msg->mad; 1337 1338 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1339 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1340 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1341 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1342 rej_msg->reason = cpu_to_be16(reason); 1343 1344 if (ari && ari_length) { 1345 cm_rej_set_reject_info_len(rej_msg, ari_length); 1346 memcpy(rej_msg->ari, ari, ari_length); 1347 } 1348 1349 ret = ib_post_send_mad(msg, NULL); 1350 if (ret) 1351 cm_free_msg(msg); 1352 1353 return ret; 1354 } 1355 1356 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1357 struct ib_sa_path_rec *primary_path, 1358 struct ib_sa_path_rec *alt_path) 1359 { 1360 memset(primary_path, 0, sizeof *primary_path); 1361 primary_path->dgid = req_msg->primary_local_gid; 1362 primary_path->sgid = req_msg->primary_remote_gid; 1363 primary_path->dlid = req_msg->primary_local_lid; 1364 primary_path->slid = req_msg->primary_remote_lid; 1365 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1366 primary_path->hop_limit = req_msg->primary_hop_limit; 1367 primary_path->traffic_class = req_msg->primary_traffic_class; 1368 primary_path->reversible = 1; 1369 primary_path->pkey = req_msg->pkey; 1370 primary_path->sl = cm_req_get_primary_sl(req_msg); 1371 primary_path->mtu_selector = IB_SA_EQ; 1372 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1373 primary_path->rate_selector = IB_SA_EQ; 1374 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1375 primary_path->packet_life_time_selector = IB_SA_EQ; 1376 primary_path->packet_life_time = 1377 cm_req_get_primary_local_ack_timeout(req_msg); 1378 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1379 primary_path->service_id = req_msg->service_id; 1380 1381 if (req_msg->alt_local_lid) { 1382 memset(alt_path, 0, sizeof *alt_path); 1383 alt_path->dgid = req_msg->alt_local_gid; 1384 alt_path->sgid = req_msg->alt_remote_gid; 1385 alt_path->dlid = req_msg->alt_local_lid; 1386 alt_path->slid = req_msg->alt_remote_lid; 1387 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1388 alt_path->hop_limit = req_msg->alt_hop_limit; 1389 alt_path->traffic_class = req_msg->alt_traffic_class; 1390 alt_path->reversible = 1; 1391 alt_path->pkey = req_msg->pkey; 1392 alt_path->sl = cm_req_get_alt_sl(req_msg); 1393 alt_path->mtu_selector = IB_SA_EQ; 1394 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1395 alt_path->rate_selector = IB_SA_EQ; 1396 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1397 alt_path->packet_life_time_selector = IB_SA_EQ; 1398 alt_path->packet_life_time = 1399 cm_req_get_alt_local_ack_timeout(req_msg); 1400 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1401 alt_path->service_id = req_msg->service_id; 1402 } 1403 } 1404 1405 static u16 cm_get_bth_pkey(struct cm_work *work) 1406 { 1407 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1408 u8 port_num = work->port->port_num; 1409 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1410 u16 pkey; 1411 int ret; 1412 1413 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1414 if (ret) { 1415 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1416 port_num, pkey_index, ret); 1417 return 0; 1418 } 1419 1420 return pkey; 1421 } 1422 1423 static void cm_format_req_event(struct cm_work *work, 1424 struct cm_id_private *cm_id_priv, 1425 struct ib_cm_id *listen_id) 1426 { 1427 struct cm_req_msg *req_msg; 1428 struct ib_cm_req_event_param *param; 1429 1430 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1431 param = &work->cm_event.param.req_rcvd; 1432 param->listen_id = listen_id; 1433 param->bth_pkey = cm_get_bth_pkey(work); 1434 param->port = cm_id_priv->av.port->port_num; 1435 param->primary_path = &work->path[0]; 1436 if (req_msg->alt_local_lid) 1437 param->alternate_path = &work->path[1]; 1438 else 1439 param->alternate_path = NULL; 1440 param->remote_ca_guid = req_msg->local_ca_guid; 1441 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1442 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1443 param->qp_type = cm_req_get_qp_type(req_msg); 1444 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1445 param->responder_resources = cm_req_get_init_depth(req_msg); 1446 param->initiator_depth = cm_req_get_resp_res(req_msg); 1447 param->local_cm_response_timeout = 1448 cm_req_get_remote_resp_timeout(req_msg); 1449 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1450 param->remote_cm_response_timeout = 1451 cm_req_get_local_resp_timeout(req_msg); 1452 param->retry_count = cm_req_get_retry_count(req_msg); 1453 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1454 param->srq = cm_req_get_srq(req_msg); 1455 work->cm_event.private_data = &req_msg->private_data; 1456 } 1457 1458 static void cm_process_work(struct cm_id_private *cm_id_priv, 1459 struct cm_work *work) 1460 { 1461 int ret; 1462 1463 /* We will typically only have the current event to report. */ 1464 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1465 cm_free_work(work); 1466 1467 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1468 spin_lock_irq(&cm_id_priv->lock); 1469 work = cm_dequeue_work(cm_id_priv); 1470 spin_unlock_irq(&cm_id_priv->lock); 1471 BUG_ON(!work); 1472 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1473 &work->cm_event); 1474 cm_free_work(work); 1475 } 1476 cm_deref_id(cm_id_priv); 1477 if (ret) 1478 cm_destroy_id(&cm_id_priv->id, ret); 1479 } 1480 1481 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1482 struct cm_id_private *cm_id_priv, 1483 enum cm_msg_response msg_mraed, u8 service_timeout, 1484 const void *private_data, u8 private_data_len) 1485 { 1486 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1487 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1488 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1489 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1490 cm_mra_set_service_timeout(mra_msg, service_timeout); 1491 1492 if (private_data && private_data_len) 1493 memcpy(mra_msg->private_data, private_data, private_data_len); 1494 } 1495 1496 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1497 struct cm_id_private *cm_id_priv, 1498 enum ib_cm_rej_reason reason, 1499 void *ari, 1500 u8 ari_length, 1501 const void *private_data, 1502 u8 private_data_len) 1503 { 1504 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1505 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1506 1507 switch(cm_id_priv->id.state) { 1508 case IB_CM_REQ_RCVD: 1509 rej_msg->local_comm_id = 0; 1510 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1511 break; 1512 case IB_CM_MRA_REQ_SENT: 1513 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1514 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1515 break; 1516 case IB_CM_REP_RCVD: 1517 case IB_CM_MRA_REP_SENT: 1518 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1519 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1520 break; 1521 default: 1522 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1523 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1524 break; 1525 } 1526 1527 rej_msg->reason = cpu_to_be16(reason); 1528 if (ari && ari_length) { 1529 cm_rej_set_reject_info_len(rej_msg, ari_length); 1530 memcpy(rej_msg->ari, ari, ari_length); 1531 } 1532 1533 if (private_data && private_data_len) 1534 memcpy(rej_msg->private_data, private_data, private_data_len); 1535 } 1536 1537 static void cm_dup_req_handler(struct cm_work *work, 1538 struct cm_id_private *cm_id_priv) 1539 { 1540 struct ib_mad_send_buf *msg = NULL; 1541 int ret; 1542 1543 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1544 counter[CM_REQ_COUNTER]); 1545 1546 /* Quick state check to discard duplicate REQs. */ 1547 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1548 return; 1549 1550 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1551 if (ret) 1552 return; 1553 1554 spin_lock_irq(&cm_id_priv->lock); 1555 switch (cm_id_priv->id.state) { 1556 case IB_CM_MRA_REQ_SENT: 1557 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1558 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1559 cm_id_priv->private_data, 1560 cm_id_priv->private_data_len); 1561 break; 1562 case IB_CM_TIMEWAIT: 1563 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1564 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1565 break; 1566 default: 1567 goto unlock; 1568 } 1569 spin_unlock_irq(&cm_id_priv->lock); 1570 1571 ret = ib_post_send_mad(msg, NULL); 1572 if (ret) 1573 goto free; 1574 return; 1575 1576 unlock: spin_unlock_irq(&cm_id_priv->lock); 1577 free: cm_free_msg(msg); 1578 } 1579 1580 static struct cm_id_private * cm_match_req(struct cm_work *work, 1581 struct cm_id_private *cm_id_priv) 1582 { 1583 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1584 struct cm_timewait_info *timewait_info; 1585 struct cm_req_msg *req_msg; 1586 1587 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1588 1589 /* Check for possible duplicate REQ. */ 1590 spin_lock_irq(&cm.lock); 1591 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1592 if (timewait_info) { 1593 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1594 timewait_info->work.remote_id); 1595 spin_unlock_irq(&cm.lock); 1596 if (cur_cm_id_priv) { 1597 cm_dup_req_handler(work, cur_cm_id_priv); 1598 cm_deref_id(cur_cm_id_priv); 1599 } 1600 return NULL; 1601 } 1602 1603 /* Check for stale connections. */ 1604 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1605 if (timewait_info) { 1606 cm_cleanup_timewait(cm_id_priv->timewait_info); 1607 spin_unlock_irq(&cm.lock); 1608 cm_issue_rej(work->port, work->mad_recv_wc, 1609 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1610 NULL, 0); 1611 return NULL; 1612 } 1613 1614 /* Find matching listen request. */ 1615 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1616 req_msg->service_id); 1617 if (!listen_cm_id_priv) { 1618 cm_cleanup_timewait(cm_id_priv->timewait_info); 1619 spin_unlock_irq(&cm.lock); 1620 cm_issue_rej(work->port, work->mad_recv_wc, 1621 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1622 NULL, 0); 1623 goto out; 1624 } 1625 atomic_inc(&listen_cm_id_priv->refcount); 1626 atomic_inc(&cm_id_priv->refcount); 1627 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1628 atomic_inc(&cm_id_priv->work_count); 1629 spin_unlock_irq(&cm.lock); 1630 out: 1631 return listen_cm_id_priv; 1632 } 1633 1634 /* 1635 * Work-around for inter-subnet connections. If the LIDs are permissive, 1636 * we need to override the LID/SL data in the REQ with the LID information 1637 * in the work completion. 1638 */ 1639 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1640 { 1641 if (!cm_req_get_primary_subnet_local(req_msg)) { 1642 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1643 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1644 cm_req_set_primary_sl(req_msg, wc->sl); 1645 } 1646 1647 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1648 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1649 } 1650 1651 if (!cm_req_get_alt_subnet_local(req_msg)) { 1652 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1653 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1654 cm_req_set_alt_sl(req_msg, wc->sl); 1655 } 1656 1657 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1658 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1659 } 1660 } 1661 1662 static int cm_req_handler(struct cm_work *work) 1663 { 1664 struct ib_cm_id *cm_id; 1665 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1666 struct cm_req_msg *req_msg; 1667 union ib_gid gid; 1668 struct ib_gid_attr gid_attr; 1669 int ret; 1670 1671 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1672 1673 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1674 if (IS_ERR(cm_id)) 1675 return PTR_ERR(cm_id); 1676 1677 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1678 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1679 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1680 work->mad_recv_wc->recv_buf.grh, 1681 &cm_id_priv->av); 1682 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1683 id.local_id); 1684 if (IS_ERR(cm_id_priv->timewait_info)) { 1685 ret = PTR_ERR(cm_id_priv->timewait_info); 1686 goto destroy; 1687 } 1688 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1689 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1690 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1691 1692 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1693 if (!listen_cm_id_priv) { 1694 ret = -EINVAL; 1695 kfree(cm_id_priv->timewait_info); 1696 goto destroy; 1697 } 1698 1699 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1700 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1701 cm_id_priv->id.service_id = req_msg->service_id; 1702 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1703 1704 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1705 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1706 1707 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1708 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit; 1709 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1710 work->port->port_num, 1711 cm_id_priv->av.ah_attr.grh.sgid_index, 1712 &gid, &gid_attr); 1713 if (!ret) { 1714 if (gid_attr.ndev) { 1715 work->path[0].ifindex = gid_attr.ndev->if_index; 1716 work->path[0].net = dev_net(gid_attr.ndev); 1717 dev_put(gid_attr.ndev); 1718 } 1719 work->path[0].gid_type = gid_attr.gid_type; 1720 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av, 1721 cm_id_priv); 1722 } 1723 if (ret) { 1724 int err = ib_get_cached_gid(work->port->cm_dev->ib_device, 1725 work->port->port_num, 0, 1726 &work->path[0].sgid, 1727 &gid_attr); 1728 if (!err && gid_attr.ndev) { 1729 work->path[0].ifindex = gid_attr.ndev->if_index; 1730 work->path[0].net = dev_net(gid_attr.ndev); 1731 dev_put(gid_attr.ndev); 1732 } 1733 work->path[0].gid_type = gid_attr.gid_type; 1734 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1735 &work->path[0].sgid, sizeof work->path[0].sgid, 1736 NULL, 0); 1737 goto rejected; 1738 } 1739 if (req_msg->alt_local_lid) { 1740 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av, 1741 cm_id_priv); 1742 if (ret) { 1743 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1744 &work->path[0].sgid, 1745 sizeof work->path[0].sgid, NULL, 0); 1746 goto rejected; 1747 } 1748 } 1749 cm_id_priv->tid = req_msg->hdr.tid; 1750 cm_id_priv->timeout_ms = cm_convert_to_ms( 1751 cm_req_get_local_resp_timeout(req_msg)); 1752 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1753 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1754 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1755 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1756 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1757 cm_id_priv->pkey = req_msg->pkey; 1758 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1759 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1760 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1761 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1762 1763 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1764 cm_process_work(cm_id_priv, work); 1765 cm_deref_id(listen_cm_id_priv); 1766 return 0; 1767 1768 rejected: 1769 atomic_dec(&cm_id_priv->refcount); 1770 cm_deref_id(listen_cm_id_priv); 1771 destroy: 1772 ib_destroy_cm_id(cm_id); 1773 return ret; 1774 } 1775 1776 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1777 struct cm_id_private *cm_id_priv, 1778 struct ib_cm_rep_param *param) 1779 { 1780 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1781 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1782 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1783 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1784 rep_msg->resp_resources = param->responder_resources; 1785 cm_rep_set_target_ack_delay(rep_msg, 1786 cm_id_priv->av.port->cm_dev->ack_delay); 1787 cm_rep_set_failover(rep_msg, param->failover_accepted); 1788 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1789 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1790 1791 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1792 rep_msg->initiator_depth = param->initiator_depth; 1793 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1794 cm_rep_set_srq(rep_msg, param->srq); 1795 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1796 } else { 1797 cm_rep_set_srq(rep_msg, 1); 1798 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1799 } 1800 1801 if (param->private_data && param->private_data_len) 1802 memcpy(rep_msg->private_data, param->private_data, 1803 param->private_data_len); 1804 } 1805 1806 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1807 struct ib_cm_rep_param *param) 1808 { 1809 struct cm_id_private *cm_id_priv; 1810 struct ib_mad_send_buf *msg; 1811 struct cm_rep_msg *rep_msg; 1812 unsigned long flags; 1813 int ret; 1814 1815 if (param->private_data && 1816 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1817 return -EINVAL; 1818 1819 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1820 spin_lock_irqsave(&cm_id_priv->lock, flags); 1821 if (cm_id->state != IB_CM_REQ_RCVD && 1822 cm_id->state != IB_CM_MRA_REQ_SENT) { 1823 ret = -EINVAL; 1824 goto out; 1825 } 1826 1827 ret = cm_alloc_msg(cm_id_priv, &msg); 1828 if (ret) 1829 goto out; 1830 1831 rep_msg = (struct cm_rep_msg *) msg->mad; 1832 cm_format_rep(rep_msg, cm_id_priv, param); 1833 msg->timeout_ms = cm_id_priv->timeout_ms; 1834 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1835 1836 ret = ib_post_send_mad(msg, NULL); 1837 if (ret) { 1838 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1839 cm_free_msg(msg); 1840 return ret; 1841 } 1842 1843 cm_id->state = IB_CM_REP_SENT; 1844 cm_id_priv->msg = msg; 1845 cm_id_priv->initiator_depth = param->initiator_depth; 1846 cm_id_priv->responder_resources = param->responder_resources; 1847 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1848 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1849 1850 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1851 return ret; 1852 } 1853 EXPORT_SYMBOL(ib_send_cm_rep); 1854 1855 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1856 struct cm_id_private *cm_id_priv, 1857 const void *private_data, 1858 u8 private_data_len) 1859 { 1860 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1861 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1862 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1863 1864 if (private_data && private_data_len) 1865 memcpy(rtu_msg->private_data, private_data, private_data_len); 1866 } 1867 1868 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1869 const void *private_data, 1870 u8 private_data_len) 1871 { 1872 struct cm_id_private *cm_id_priv; 1873 struct ib_mad_send_buf *msg; 1874 unsigned long flags; 1875 void *data; 1876 int ret; 1877 1878 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1879 return -EINVAL; 1880 1881 data = cm_copy_private_data(private_data, private_data_len); 1882 if (IS_ERR(data)) 1883 return PTR_ERR(data); 1884 1885 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1886 spin_lock_irqsave(&cm_id_priv->lock, flags); 1887 if (cm_id->state != IB_CM_REP_RCVD && 1888 cm_id->state != IB_CM_MRA_REP_SENT) { 1889 ret = -EINVAL; 1890 goto error; 1891 } 1892 1893 ret = cm_alloc_msg(cm_id_priv, &msg); 1894 if (ret) 1895 goto error; 1896 1897 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1898 private_data, private_data_len); 1899 1900 ret = ib_post_send_mad(msg, NULL); 1901 if (ret) { 1902 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1903 cm_free_msg(msg); 1904 kfree(data); 1905 return ret; 1906 } 1907 1908 cm_id->state = IB_CM_ESTABLISHED; 1909 cm_set_private_data(cm_id_priv, data, private_data_len); 1910 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1911 return 0; 1912 1913 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1914 kfree(data); 1915 return ret; 1916 } 1917 EXPORT_SYMBOL(ib_send_cm_rtu); 1918 1919 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1920 { 1921 struct cm_rep_msg *rep_msg; 1922 struct ib_cm_rep_event_param *param; 1923 1924 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1925 param = &work->cm_event.param.rep_rcvd; 1926 param->remote_ca_guid = rep_msg->local_ca_guid; 1927 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1928 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1929 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1930 param->responder_resources = rep_msg->initiator_depth; 1931 param->initiator_depth = rep_msg->resp_resources; 1932 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1933 param->failover_accepted = cm_rep_get_failover(rep_msg); 1934 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1935 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1936 param->srq = cm_rep_get_srq(rep_msg); 1937 work->cm_event.private_data = &rep_msg->private_data; 1938 } 1939 1940 static void cm_dup_rep_handler(struct cm_work *work) 1941 { 1942 struct cm_id_private *cm_id_priv; 1943 struct cm_rep_msg *rep_msg; 1944 struct ib_mad_send_buf *msg = NULL; 1945 int ret; 1946 1947 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1948 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1949 rep_msg->local_comm_id); 1950 if (!cm_id_priv) 1951 return; 1952 1953 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1954 counter[CM_REP_COUNTER]); 1955 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1956 if (ret) 1957 goto deref; 1958 1959 spin_lock_irq(&cm_id_priv->lock); 1960 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1961 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1962 cm_id_priv->private_data, 1963 cm_id_priv->private_data_len); 1964 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1965 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1966 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1967 cm_id_priv->private_data, 1968 cm_id_priv->private_data_len); 1969 else 1970 goto unlock; 1971 spin_unlock_irq(&cm_id_priv->lock); 1972 1973 ret = ib_post_send_mad(msg, NULL); 1974 if (ret) 1975 goto free; 1976 goto deref; 1977 1978 unlock: spin_unlock_irq(&cm_id_priv->lock); 1979 free: cm_free_msg(msg); 1980 deref: cm_deref_id(cm_id_priv); 1981 } 1982 1983 static int cm_rep_handler(struct cm_work *work) 1984 { 1985 struct cm_id_private *cm_id_priv; 1986 struct cm_rep_msg *rep_msg; 1987 int ret; 1988 1989 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1990 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1991 if (!cm_id_priv) { 1992 cm_dup_rep_handler(work); 1993 return -EINVAL; 1994 } 1995 1996 cm_format_rep_event(work, cm_id_priv->qp_type); 1997 1998 spin_lock_irq(&cm_id_priv->lock); 1999 switch (cm_id_priv->id.state) { 2000 case IB_CM_REQ_SENT: 2001 case IB_CM_MRA_REQ_RCVD: 2002 break; 2003 default: 2004 spin_unlock_irq(&cm_id_priv->lock); 2005 ret = -EINVAL; 2006 goto error; 2007 } 2008 2009 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2010 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2011 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2012 2013 spin_lock(&cm.lock); 2014 /* Check for duplicate REP. */ 2015 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2016 spin_unlock(&cm.lock); 2017 spin_unlock_irq(&cm_id_priv->lock); 2018 ret = -EINVAL; 2019 goto error; 2020 } 2021 /* Check for a stale connection. */ 2022 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 2023 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2024 &cm.remote_id_table); 2025 cm_id_priv->timewait_info->inserted_remote_id = 0; 2026 spin_unlock(&cm.lock); 2027 spin_unlock_irq(&cm_id_priv->lock); 2028 cm_issue_rej(work->port, work->mad_recv_wc, 2029 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2030 NULL, 0); 2031 ret = -EINVAL; 2032 goto error; 2033 } 2034 spin_unlock(&cm.lock); 2035 2036 cm_id_priv->id.state = IB_CM_REP_RCVD; 2037 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2038 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2039 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2040 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2041 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2042 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2043 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2044 cm_id_priv->av.timeout = 2045 cm_ack_timeout(cm_id_priv->target_ack_delay, 2046 cm_id_priv->av.timeout - 1); 2047 cm_id_priv->alt_av.timeout = 2048 cm_ack_timeout(cm_id_priv->target_ack_delay, 2049 cm_id_priv->alt_av.timeout - 1); 2050 2051 /* todo: handle peer_to_peer */ 2052 2053 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2054 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2055 if (!ret) 2056 list_add_tail(&work->list, &cm_id_priv->work_list); 2057 spin_unlock_irq(&cm_id_priv->lock); 2058 2059 if (ret) 2060 cm_process_work(cm_id_priv, work); 2061 else 2062 cm_deref_id(cm_id_priv); 2063 return 0; 2064 2065 error: 2066 cm_deref_id(cm_id_priv); 2067 return ret; 2068 } 2069 2070 static int cm_establish_handler(struct cm_work *work) 2071 { 2072 struct cm_id_private *cm_id_priv; 2073 int ret; 2074 2075 /* See comment in cm_establish about lookup. */ 2076 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2077 if (!cm_id_priv) 2078 return -EINVAL; 2079 2080 spin_lock_irq(&cm_id_priv->lock); 2081 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2082 spin_unlock_irq(&cm_id_priv->lock); 2083 goto out; 2084 } 2085 2086 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2087 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2088 if (!ret) 2089 list_add_tail(&work->list, &cm_id_priv->work_list); 2090 spin_unlock_irq(&cm_id_priv->lock); 2091 2092 if (ret) 2093 cm_process_work(cm_id_priv, work); 2094 else 2095 cm_deref_id(cm_id_priv); 2096 return 0; 2097 out: 2098 cm_deref_id(cm_id_priv); 2099 return -EINVAL; 2100 } 2101 2102 static int cm_rtu_handler(struct cm_work *work) 2103 { 2104 struct cm_id_private *cm_id_priv; 2105 struct cm_rtu_msg *rtu_msg; 2106 int ret; 2107 2108 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2109 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2110 rtu_msg->local_comm_id); 2111 if (!cm_id_priv) 2112 return -EINVAL; 2113 2114 work->cm_event.private_data = &rtu_msg->private_data; 2115 2116 spin_lock_irq(&cm_id_priv->lock); 2117 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2118 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2119 spin_unlock_irq(&cm_id_priv->lock); 2120 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2121 counter[CM_RTU_COUNTER]); 2122 goto out; 2123 } 2124 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2125 2126 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2127 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2128 if (!ret) 2129 list_add_tail(&work->list, &cm_id_priv->work_list); 2130 spin_unlock_irq(&cm_id_priv->lock); 2131 2132 if (ret) 2133 cm_process_work(cm_id_priv, work); 2134 else 2135 cm_deref_id(cm_id_priv); 2136 return 0; 2137 out: 2138 cm_deref_id(cm_id_priv); 2139 return -EINVAL; 2140 } 2141 2142 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2143 struct cm_id_private *cm_id_priv, 2144 const void *private_data, 2145 u8 private_data_len) 2146 { 2147 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2148 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2149 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2150 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2151 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2152 2153 if (private_data && private_data_len) 2154 memcpy(dreq_msg->private_data, private_data, private_data_len); 2155 } 2156 2157 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2158 const void *private_data, 2159 u8 private_data_len) 2160 { 2161 struct cm_id_private *cm_id_priv; 2162 struct ib_mad_send_buf *msg; 2163 unsigned long flags; 2164 int ret; 2165 2166 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2167 return -EINVAL; 2168 2169 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2170 spin_lock_irqsave(&cm_id_priv->lock, flags); 2171 if (cm_id->state != IB_CM_ESTABLISHED) { 2172 ret = -EINVAL; 2173 goto out; 2174 } 2175 2176 if (cm_id->lap_state == IB_CM_LAP_SENT || 2177 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2178 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2179 2180 ret = cm_alloc_msg(cm_id_priv, &msg); 2181 if (ret) { 2182 cm_enter_timewait(cm_id_priv); 2183 goto out; 2184 } 2185 2186 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2187 private_data, private_data_len); 2188 msg->timeout_ms = cm_id_priv->timeout_ms; 2189 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2190 2191 ret = ib_post_send_mad(msg, NULL); 2192 if (ret) { 2193 cm_enter_timewait(cm_id_priv); 2194 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2195 cm_free_msg(msg); 2196 return ret; 2197 } 2198 2199 cm_id->state = IB_CM_DREQ_SENT; 2200 cm_id_priv->msg = msg; 2201 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2202 return ret; 2203 } 2204 EXPORT_SYMBOL(ib_send_cm_dreq); 2205 2206 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2207 struct cm_id_private *cm_id_priv, 2208 const void *private_data, 2209 u8 private_data_len) 2210 { 2211 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2212 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2213 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2214 2215 if (private_data && private_data_len) 2216 memcpy(drep_msg->private_data, private_data, private_data_len); 2217 } 2218 2219 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2220 const void *private_data, 2221 u8 private_data_len) 2222 { 2223 struct cm_id_private *cm_id_priv; 2224 struct ib_mad_send_buf *msg; 2225 unsigned long flags; 2226 void *data; 2227 int ret; 2228 2229 if (private_data && private_data_len > IB_CM_DREP_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 spin_lock_irqsave(&cm_id_priv->lock, flags); 2238 if (cm_id->state != IB_CM_DREQ_RCVD) { 2239 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2240 kfree(data); 2241 return -EINVAL; 2242 } 2243 2244 cm_set_private_data(cm_id_priv, data, private_data_len); 2245 cm_enter_timewait(cm_id_priv); 2246 2247 ret = cm_alloc_msg(cm_id_priv, &msg); 2248 if (ret) 2249 goto out; 2250 2251 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2252 private_data, private_data_len); 2253 2254 ret = ib_post_send_mad(msg, NULL); 2255 if (ret) { 2256 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2257 cm_free_msg(msg); 2258 return ret; 2259 } 2260 2261 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2262 return ret; 2263 } 2264 EXPORT_SYMBOL(ib_send_cm_drep); 2265 2266 static int cm_issue_drep(struct cm_port *port, 2267 struct ib_mad_recv_wc *mad_recv_wc) 2268 { 2269 struct ib_mad_send_buf *msg = NULL; 2270 struct cm_dreq_msg *dreq_msg; 2271 struct cm_drep_msg *drep_msg; 2272 int ret; 2273 2274 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2275 if (ret) 2276 return ret; 2277 2278 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2279 drep_msg = (struct cm_drep_msg *) msg->mad; 2280 2281 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2282 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2283 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2284 2285 ret = ib_post_send_mad(msg, NULL); 2286 if (ret) 2287 cm_free_msg(msg); 2288 2289 return ret; 2290 } 2291 2292 static int cm_dreq_handler(struct cm_work *work) 2293 { 2294 struct cm_id_private *cm_id_priv; 2295 struct cm_dreq_msg *dreq_msg; 2296 struct ib_mad_send_buf *msg = NULL; 2297 int ret; 2298 2299 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2300 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2301 dreq_msg->local_comm_id); 2302 if (!cm_id_priv) { 2303 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2304 counter[CM_DREQ_COUNTER]); 2305 cm_issue_drep(work->port, work->mad_recv_wc); 2306 return -EINVAL; 2307 } 2308 2309 work->cm_event.private_data = &dreq_msg->private_data; 2310 2311 spin_lock_irq(&cm_id_priv->lock); 2312 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2313 goto unlock; 2314 2315 switch (cm_id_priv->id.state) { 2316 case IB_CM_REP_SENT: 2317 case IB_CM_DREQ_SENT: 2318 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2319 break; 2320 case IB_CM_ESTABLISHED: 2321 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2322 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2323 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2324 break; 2325 case IB_CM_MRA_REP_RCVD: 2326 break; 2327 case IB_CM_TIMEWAIT: 2328 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2329 counter[CM_DREQ_COUNTER]); 2330 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2331 goto unlock; 2332 2333 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2334 cm_id_priv->private_data, 2335 cm_id_priv->private_data_len); 2336 spin_unlock_irq(&cm_id_priv->lock); 2337 2338 if (ib_post_send_mad(msg, NULL)) 2339 cm_free_msg(msg); 2340 goto deref; 2341 case IB_CM_DREQ_RCVD: 2342 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2343 counter[CM_DREQ_COUNTER]); 2344 goto unlock; 2345 default: 2346 goto unlock; 2347 } 2348 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2349 cm_id_priv->tid = dreq_msg->hdr.tid; 2350 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2351 if (!ret) 2352 list_add_tail(&work->list, &cm_id_priv->work_list); 2353 spin_unlock_irq(&cm_id_priv->lock); 2354 2355 if (ret) 2356 cm_process_work(cm_id_priv, work); 2357 else 2358 cm_deref_id(cm_id_priv); 2359 return 0; 2360 2361 unlock: spin_unlock_irq(&cm_id_priv->lock); 2362 deref: cm_deref_id(cm_id_priv); 2363 return -EINVAL; 2364 } 2365 2366 static int cm_drep_handler(struct cm_work *work) 2367 { 2368 struct cm_id_private *cm_id_priv; 2369 struct cm_drep_msg *drep_msg; 2370 int ret; 2371 2372 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2373 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2374 drep_msg->local_comm_id); 2375 if (!cm_id_priv) 2376 return -EINVAL; 2377 2378 work->cm_event.private_data = &drep_msg->private_data; 2379 2380 spin_lock_irq(&cm_id_priv->lock); 2381 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2382 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2383 spin_unlock_irq(&cm_id_priv->lock); 2384 goto out; 2385 } 2386 cm_enter_timewait(cm_id_priv); 2387 2388 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2389 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2390 if (!ret) 2391 list_add_tail(&work->list, &cm_id_priv->work_list); 2392 spin_unlock_irq(&cm_id_priv->lock); 2393 2394 if (ret) 2395 cm_process_work(cm_id_priv, work); 2396 else 2397 cm_deref_id(cm_id_priv); 2398 return 0; 2399 out: 2400 cm_deref_id(cm_id_priv); 2401 return -EINVAL; 2402 } 2403 2404 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2405 enum ib_cm_rej_reason reason, 2406 void *ari, 2407 u8 ari_length, 2408 const void *private_data, 2409 u8 private_data_len) 2410 { 2411 struct cm_id_private *cm_id_priv; 2412 struct ib_mad_send_buf *msg; 2413 unsigned long flags; 2414 int ret; 2415 2416 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2417 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2418 return -EINVAL; 2419 2420 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2421 2422 spin_lock_irqsave(&cm_id_priv->lock, flags); 2423 switch (cm_id->state) { 2424 case IB_CM_REQ_SENT: 2425 case IB_CM_MRA_REQ_RCVD: 2426 case IB_CM_REQ_RCVD: 2427 case IB_CM_MRA_REQ_SENT: 2428 case IB_CM_REP_RCVD: 2429 case IB_CM_MRA_REP_SENT: 2430 ret = cm_alloc_msg(cm_id_priv, &msg); 2431 if (!ret) 2432 cm_format_rej((struct cm_rej_msg *) msg->mad, 2433 cm_id_priv, reason, ari, ari_length, 2434 private_data, private_data_len); 2435 2436 cm_reset_to_idle(cm_id_priv); 2437 break; 2438 case IB_CM_REP_SENT: 2439 case IB_CM_MRA_REP_RCVD: 2440 ret = cm_alloc_msg(cm_id_priv, &msg); 2441 if (!ret) 2442 cm_format_rej((struct cm_rej_msg *) msg->mad, 2443 cm_id_priv, reason, ari, ari_length, 2444 private_data, private_data_len); 2445 2446 cm_enter_timewait(cm_id_priv); 2447 break; 2448 default: 2449 ret = -EINVAL; 2450 goto out; 2451 } 2452 2453 if (ret) 2454 goto out; 2455 2456 ret = ib_post_send_mad(msg, NULL); 2457 if (ret) 2458 cm_free_msg(msg); 2459 2460 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2461 return ret; 2462 } 2463 EXPORT_SYMBOL(ib_send_cm_rej); 2464 2465 static void cm_format_rej_event(struct cm_work *work) 2466 { 2467 struct cm_rej_msg *rej_msg; 2468 struct ib_cm_rej_event_param *param; 2469 2470 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2471 param = &work->cm_event.param.rej_rcvd; 2472 param->ari = rej_msg->ari; 2473 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2474 param->reason = __be16_to_cpu(rej_msg->reason); 2475 work->cm_event.private_data = &rej_msg->private_data; 2476 } 2477 2478 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2479 { 2480 struct cm_timewait_info *timewait_info; 2481 struct cm_id_private *cm_id_priv; 2482 __be32 remote_id; 2483 2484 remote_id = rej_msg->local_comm_id; 2485 2486 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2487 spin_lock_irq(&cm.lock); 2488 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2489 remote_id); 2490 if (!timewait_info) { 2491 spin_unlock_irq(&cm.lock); 2492 return NULL; 2493 } 2494 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2495 (timewait_info->work.local_id ^ 2496 cm.random_id_operand)); 2497 if (cm_id_priv) { 2498 if (cm_id_priv->id.remote_id == remote_id) 2499 atomic_inc(&cm_id_priv->refcount); 2500 else 2501 cm_id_priv = NULL; 2502 } 2503 spin_unlock_irq(&cm.lock); 2504 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2505 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2506 else 2507 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2508 2509 return cm_id_priv; 2510 } 2511 2512 static int cm_rej_handler(struct cm_work *work) 2513 { 2514 struct cm_id_private *cm_id_priv; 2515 struct cm_rej_msg *rej_msg; 2516 int ret; 2517 2518 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2519 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2520 if (!cm_id_priv) 2521 return -EINVAL; 2522 2523 cm_format_rej_event(work); 2524 2525 spin_lock_irq(&cm_id_priv->lock); 2526 switch (cm_id_priv->id.state) { 2527 case IB_CM_REQ_SENT: 2528 case IB_CM_MRA_REQ_RCVD: 2529 case IB_CM_REP_SENT: 2530 case IB_CM_MRA_REP_RCVD: 2531 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2532 /* fall through */ 2533 case IB_CM_REQ_RCVD: 2534 case IB_CM_MRA_REQ_SENT: 2535 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2536 cm_enter_timewait(cm_id_priv); 2537 else 2538 cm_reset_to_idle(cm_id_priv); 2539 break; 2540 case IB_CM_DREQ_SENT: 2541 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2542 /* fall through */ 2543 case IB_CM_REP_RCVD: 2544 case IB_CM_MRA_REP_SENT: 2545 cm_enter_timewait(cm_id_priv); 2546 break; 2547 case IB_CM_ESTABLISHED: 2548 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2549 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2550 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2551 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2552 cm_id_priv->msg); 2553 cm_enter_timewait(cm_id_priv); 2554 break; 2555 } 2556 /* fall through */ 2557 default: 2558 spin_unlock_irq(&cm_id_priv->lock); 2559 ret = -EINVAL; 2560 goto out; 2561 } 2562 2563 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2564 if (!ret) 2565 list_add_tail(&work->list, &cm_id_priv->work_list); 2566 spin_unlock_irq(&cm_id_priv->lock); 2567 2568 if (ret) 2569 cm_process_work(cm_id_priv, work); 2570 else 2571 cm_deref_id(cm_id_priv); 2572 return 0; 2573 out: 2574 cm_deref_id(cm_id_priv); 2575 return -EINVAL; 2576 } 2577 2578 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2579 u8 service_timeout, 2580 const void *private_data, 2581 u8 private_data_len) 2582 { 2583 struct cm_id_private *cm_id_priv; 2584 struct ib_mad_send_buf *msg; 2585 enum ib_cm_state cm_state; 2586 enum ib_cm_lap_state lap_state; 2587 enum cm_msg_response msg_response; 2588 void *data; 2589 unsigned long flags; 2590 int ret; 2591 2592 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2593 return -EINVAL; 2594 2595 data = cm_copy_private_data(private_data, private_data_len); 2596 if (IS_ERR(data)) 2597 return PTR_ERR(data); 2598 2599 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2600 2601 spin_lock_irqsave(&cm_id_priv->lock, flags); 2602 switch(cm_id_priv->id.state) { 2603 case IB_CM_REQ_RCVD: 2604 cm_state = IB_CM_MRA_REQ_SENT; 2605 lap_state = cm_id->lap_state; 2606 msg_response = CM_MSG_RESPONSE_REQ; 2607 break; 2608 case IB_CM_REP_RCVD: 2609 cm_state = IB_CM_MRA_REP_SENT; 2610 lap_state = cm_id->lap_state; 2611 msg_response = CM_MSG_RESPONSE_REP; 2612 break; 2613 case IB_CM_ESTABLISHED: 2614 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2615 cm_state = cm_id->state; 2616 lap_state = IB_CM_MRA_LAP_SENT; 2617 msg_response = CM_MSG_RESPONSE_OTHER; 2618 break; 2619 } 2620 default: 2621 ret = -EINVAL; 2622 goto error1; 2623 } 2624 2625 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2626 ret = cm_alloc_msg(cm_id_priv, &msg); 2627 if (ret) 2628 goto error1; 2629 2630 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2631 msg_response, service_timeout, 2632 private_data, private_data_len); 2633 ret = ib_post_send_mad(msg, NULL); 2634 if (ret) 2635 goto error2; 2636 } 2637 2638 cm_id->state = cm_state; 2639 cm_id->lap_state = lap_state; 2640 cm_id_priv->service_timeout = service_timeout; 2641 cm_set_private_data(cm_id_priv, data, private_data_len); 2642 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2643 return 0; 2644 2645 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2646 kfree(data); 2647 return ret; 2648 2649 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2650 kfree(data); 2651 cm_free_msg(msg); 2652 return ret; 2653 } 2654 EXPORT_SYMBOL(ib_send_cm_mra); 2655 2656 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2657 { 2658 switch (cm_mra_get_msg_mraed(mra_msg)) { 2659 case CM_MSG_RESPONSE_REQ: 2660 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2661 case CM_MSG_RESPONSE_REP: 2662 case CM_MSG_RESPONSE_OTHER: 2663 return cm_acquire_id(mra_msg->remote_comm_id, 2664 mra_msg->local_comm_id); 2665 default: 2666 return NULL; 2667 } 2668 } 2669 2670 static int cm_mra_handler(struct cm_work *work) 2671 { 2672 struct cm_id_private *cm_id_priv; 2673 struct cm_mra_msg *mra_msg; 2674 int timeout, ret; 2675 2676 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2677 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2678 if (!cm_id_priv) 2679 return -EINVAL; 2680 2681 work->cm_event.private_data = &mra_msg->private_data; 2682 work->cm_event.param.mra_rcvd.service_timeout = 2683 cm_mra_get_service_timeout(mra_msg); 2684 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2685 cm_convert_to_ms(cm_id_priv->av.timeout); 2686 2687 spin_lock_irq(&cm_id_priv->lock); 2688 switch (cm_id_priv->id.state) { 2689 case IB_CM_REQ_SENT: 2690 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2691 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2692 cm_id_priv->msg, timeout)) 2693 goto out; 2694 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2695 break; 2696 case IB_CM_REP_SENT: 2697 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2698 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2699 cm_id_priv->msg, timeout)) 2700 goto out; 2701 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2702 break; 2703 case IB_CM_ESTABLISHED: 2704 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2705 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2706 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2707 cm_id_priv->msg, timeout)) { 2708 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2709 atomic_long_inc(&work->port-> 2710 counter_group[CM_RECV_DUPLICATES]. 2711 counter[CM_MRA_COUNTER]); 2712 goto out; 2713 } 2714 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2715 break; 2716 case IB_CM_MRA_REQ_RCVD: 2717 case IB_CM_MRA_REP_RCVD: 2718 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2719 counter[CM_MRA_COUNTER]); 2720 /* fall through */ 2721 default: 2722 goto out; 2723 } 2724 2725 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2726 cm_id_priv->id.state; 2727 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2728 if (!ret) 2729 list_add_tail(&work->list, &cm_id_priv->work_list); 2730 spin_unlock_irq(&cm_id_priv->lock); 2731 2732 if (ret) 2733 cm_process_work(cm_id_priv, work); 2734 else 2735 cm_deref_id(cm_id_priv); 2736 return 0; 2737 out: 2738 spin_unlock_irq(&cm_id_priv->lock); 2739 cm_deref_id(cm_id_priv); 2740 return -EINVAL; 2741 } 2742 2743 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2744 struct cm_id_private *cm_id_priv, 2745 struct ib_sa_path_rec *alternate_path, 2746 const void *private_data, 2747 u8 private_data_len) 2748 { 2749 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2750 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2751 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2752 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2753 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2754 /* todo: need remote CM response timeout */ 2755 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2756 lap_msg->alt_local_lid = alternate_path->slid; 2757 lap_msg->alt_remote_lid = alternate_path->dlid; 2758 lap_msg->alt_local_gid = alternate_path->sgid; 2759 lap_msg->alt_remote_gid = alternate_path->dgid; 2760 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2761 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2762 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2763 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2764 cm_lap_set_sl(lap_msg, alternate_path->sl); 2765 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2766 cm_lap_set_local_ack_timeout(lap_msg, 2767 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2768 alternate_path->packet_life_time)); 2769 2770 if (private_data && private_data_len) 2771 memcpy(lap_msg->private_data, private_data, private_data_len); 2772 } 2773 2774 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2775 struct ib_sa_path_rec *alternate_path, 2776 const void *private_data, 2777 u8 private_data_len) 2778 { 2779 struct cm_id_private *cm_id_priv; 2780 struct ib_mad_send_buf *msg; 2781 unsigned long flags; 2782 int ret; 2783 2784 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2785 return -EINVAL; 2786 2787 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2788 spin_lock_irqsave(&cm_id_priv->lock, flags); 2789 if (cm_id->state != IB_CM_ESTABLISHED || 2790 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2791 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2792 ret = -EINVAL; 2793 goto out; 2794 } 2795 2796 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av, 2797 cm_id_priv); 2798 if (ret) 2799 goto out; 2800 cm_id_priv->alt_av.timeout = 2801 cm_ack_timeout(cm_id_priv->target_ack_delay, 2802 cm_id_priv->alt_av.timeout - 1); 2803 2804 ret = cm_alloc_msg(cm_id_priv, &msg); 2805 if (ret) 2806 goto out; 2807 2808 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2809 alternate_path, private_data, private_data_len); 2810 msg->timeout_ms = cm_id_priv->timeout_ms; 2811 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2812 2813 ret = ib_post_send_mad(msg, NULL); 2814 if (ret) { 2815 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2816 cm_free_msg(msg); 2817 return ret; 2818 } 2819 2820 cm_id->lap_state = IB_CM_LAP_SENT; 2821 cm_id_priv->msg = msg; 2822 2823 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2824 return ret; 2825 } 2826 EXPORT_SYMBOL(ib_send_cm_lap); 2827 2828 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2829 struct ib_sa_path_rec *path, 2830 struct cm_lap_msg *lap_msg) 2831 { 2832 memset(path, 0, sizeof *path); 2833 path->dgid = lap_msg->alt_local_gid; 2834 path->sgid = lap_msg->alt_remote_gid; 2835 path->dlid = lap_msg->alt_local_lid; 2836 path->slid = lap_msg->alt_remote_lid; 2837 path->flow_label = cm_lap_get_flow_label(lap_msg); 2838 path->hop_limit = lap_msg->alt_hop_limit; 2839 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2840 path->reversible = 1; 2841 path->pkey = cm_id_priv->pkey; 2842 path->sl = cm_lap_get_sl(lap_msg); 2843 path->mtu_selector = IB_SA_EQ; 2844 path->mtu = cm_id_priv->path_mtu; 2845 path->rate_selector = IB_SA_EQ; 2846 path->rate = cm_lap_get_packet_rate(lap_msg); 2847 path->packet_life_time_selector = IB_SA_EQ; 2848 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2849 path->packet_life_time -= (path->packet_life_time > 0); 2850 } 2851 2852 static int cm_lap_handler(struct cm_work *work) 2853 { 2854 struct cm_id_private *cm_id_priv; 2855 struct cm_lap_msg *lap_msg; 2856 struct ib_cm_lap_event_param *param; 2857 struct ib_mad_send_buf *msg = NULL; 2858 int ret; 2859 2860 /* todo: verify LAP request and send reject APR if invalid. */ 2861 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2862 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2863 lap_msg->local_comm_id); 2864 if (!cm_id_priv) 2865 return -EINVAL; 2866 2867 param = &work->cm_event.param.lap_rcvd; 2868 param->alternate_path = &work->path[0]; 2869 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2870 work->cm_event.private_data = &lap_msg->private_data; 2871 2872 spin_lock_irq(&cm_id_priv->lock); 2873 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2874 goto unlock; 2875 2876 switch (cm_id_priv->id.lap_state) { 2877 case IB_CM_LAP_UNINIT: 2878 case IB_CM_LAP_IDLE: 2879 break; 2880 case IB_CM_MRA_LAP_SENT: 2881 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2882 counter[CM_LAP_COUNTER]); 2883 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2884 goto unlock; 2885 2886 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2887 CM_MSG_RESPONSE_OTHER, 2888 cm_id_priv->service_timeout, 2889 cm_id_priv->private_data, 2890 cm_id_priv->private_data_len); 2891 spin_unlock_irq(&cm_id_priv->lock); 2892 2893 if (ib_post_send_mad(msg, NULL)) 2894 cm_free_msg(msg); 2895 goto deref; 2896 case IB_CM_LAP_RCVD: 2897 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2898 counter[CM_LAP_COUNTER]); 2899 goto unlock; 2900 default: 2901 goto unlock; 2902 } 2903 2904 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2905 cm_id_priv->tid = lap_msg->hdr.tid; 2906 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2907 work->mad_recv_wc->recv_buf.grh, 2908 &cm_id_priv->av); 2909 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, 2910 cm_id_priv); 2911 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2912 if (!ret) 2913 list_add_tail(&work->list, &cm_id_priv->work_list); 2914 spin_unlock_irq(&cm_id_priv->lock); 2915 2916 if (ret) 2917 cm_process_work(cm_id_priv, work); 2918 else 2919 cm_deref_id(cm_id_priv); 2920 return 0; 2921 2922 unlock: spin_unlock_irq(&cm_id_priv->lock); 2923 deref: cm_deref_id(cm_id_priv); 2924 return -EINVAL; 2925 } 2926 2927 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2928 struct cm_id_private *cm_id_priv, 2929 enum ib_cm_apr_status status, 2930 void *info, 2931 u8 info_length, 2932 const void *private_data, 2933 u8 private_data_len) 2934 { 2935 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2936 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2937 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2938 apr_msg->ap_status = (u8) status; 2939 2940 if (info && info_length) { 2941 apr_msg->info_length = info_length; 2942 memcpy(apr_msg->info, info, info_length); 2943 } 2944 2945 if (private_data && private_data_len) 2946 memcpy(apr_msg->private_data, private_data, private_data_len); 2947 } 2948 2949 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2950 enum ib_cm_apr_status status, 2951 void *info, 2952 u8 info_length, 2953 const void *private_data, 2954 u8 private_data_len) 2955 { 2956 struct cm_id_private *cm_id_priv; 2957 struct ib_mad_send_buf *msg; 2958 unsigned long flags; 2959 int ret; 2960 2961 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2962 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2963 return -EINVAL; 2964 2965 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2966 spin_lock_irqsave(&cm_id_priv->lock, flags); 2967 if (cm_id->state != IB_CM_ESTABLISHED || 2968 (cm_id->lap_state != IB_CM_LAP_RCVD && 2969 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2970 ret = -EINVAL; 2971 goto out; 2972 } 2973 2974 ret = cm_alloc_msg(cm_id_priv, &msg); 2975 if (ret) 2976 goto out; 2977 2978 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2979 info, info_length, private_data, private_data_len); 2980 ret = ib_post_send_mad(msg, NULL); 2981 if (ret) { 2982 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2983 cm_free_msg(msg); 2984 return ret; 2985 } 2986 2987 cm_id->lap_state = IB_CM_LAP_IDLE; 2988 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2989 return ret; 2990 } 2991 EXPORT_SYMBOL(ib_send_cm_apr); 2992 2993 static int cm_apr_handler(struct cm_work *work) 2994 { 2995 struct cm_id_private *cm_id_priv; 2996 struct cm_apr_msg *apr_msg; 2997 int ret; 2998 2999 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3000 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 3001 apr_msg->local_comm_id); 3002 if (!cm_id_priv) 3003 return -EINVAL; /* Unmatched reply. */ 3004 3005 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3006 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3007 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3008 work->cm_event.private_data = &apr_msg->private_data; 3009 3010 spin_lock_irq(&cm_id_priv->lock); 3011 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3012 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3013 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3014 spin_unlock_irq(&cm_id_priv->lock); 3015 goto out; 3016 } 3017 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3018 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3019 cm_id_priv->msg = NULL; 3020 3021 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3022 if (!ret) 3023 list_add_tail(&work->list, &cm_id_priv->work_list); 3024 spin_unlock_irq(&cm_id_priv->lock); 3025 3026 if (ret) 3027 cm_process_work(cm_id_priv, work); 3028 else 3029 cm_deref_id(cm_id_priv); 3030 return 0; 3031 out: 3032 cm_deref_id(cm_id_priv); 3033 return -EINVAL; 3034 } 3035 3036 static int cm_timewait_handler(struct cm_work *work) 3037 { 3038 struct cm_timewait_info *timewait_info; 3039 struct cm_id_private *cm_id_priv; 3040 int ret; 3041 3042 timewait_info = (struct cm_timewait_info *)work; 3043 spin_lock_irq(&cm.lock); 3044 list_del(&timewait_info->list); 3045 spin_unlock_irq(&cm.lock); 3046 3047 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3048 timewait_info->work.remote_id); 3049 if (!cm_id_priv) 3050 return -EINVAL; 3051 3052 spin_lock_irq(&cm_id_priv->lock); 3053 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3054 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3055 spin_unlock_irq(&cm_id_priv->lock); 3056 goto out; 3057 } 3058 cm_id_priv->id.state = IB_CM_IDLE; 3059 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3060 if (!ret) 3061 list_add_tail(&work->list, &cm_id_priv->work_list); 3062 spin_unlock_irq(&cm_id_priv->lock); 3063 3064 if (ret) 3065 cm_process_work(cm_id_priv, work); 3066 else 3067 cm_deref_id(cm_id_priv); 3068 return 0; 3069 out: 3070 cm_deref_id(cm_id_priv); 3071 return -EINVAL; 3072 } 3073 3074 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3075 struct cm_id_private *cm_id_priv, 3076 struct ib_cm_sidr_req_param *param) 3077 { 3078 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3079 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 3080 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3081 sidr_req_msg->pkey = param->path->pkey; 3082 sidr_req_msg->service_id = param->service_id; 3083 3084 if (param->private_data && param->private_data_len) 3085 memcpy(sidr_req_msg->private_data, param->private_data, 3086 param->private_data_len); 3087 } 3088 3089 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3090 struct ib_cm_sidr_req_param *param) 3091 { 3092 struct cm_id_private *cm_id_priv; 3093 struct ib_mad_send_buf *msg; 3094 unsigned long flags; 3095 int ret; 3096 3097 if (!param->path || (param->private_data && 3098 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3099 return -EINVAL; 3100 3101 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3102 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv); 3103 if (ret) 3104 goto out; 3105 3106 cm_id->service_id = param->service_id; 3107 cm_id->service_mask = ~cpu_to_be64(0); 3108 cm_id_priv->timeout_ms = param->timeout_ms; 3109 cm_id_priv->max_cm_retries = param->max_cm_retries; 3110 ret = cm_alloc_msg(cm_id_priv, &msg); 3111 if (ret) 3112 goto out; 3113 3114 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3115 param); 3116 msg->timeout_ms = cm_id_priv->timeout_ms; 3117 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3118 3119 spin_lock_irqsave(&cm_id_priv->lock, flags); 3120 if (cm_id->state == IB_CM_IDLE) 3121 ret = ib_post_send_mad(msg, NULL); 3122 else 3123 ret = -EINVAL; 3124 3125 if (ret) { 3126 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3127 cm_free_msg(msg); 3128 goto out; 3129 } 3130 cm_id->state = IB_CM_SIDR_REQ_SENT; 3131 cm_id_priv->msg = msg; 3132 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3133 out: 3134 return ret; 3135 } 3136 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3137 3138 static void cm_format_sidr_req_event(struct cm_work *work, 3139 struct ib_cm_id *listen_id) 3140 { 3141 struct cm_sidr_req_msg *sidr_req_msg; 3142 struct ib_cm_sidr_req_event_param *param; 3143 3144 sidr_req_msg = (struct cm_sidr_req_msg *) 3145 work->mad_recv_wc->recv_buf.mad; 3146 param = &work->cm_event.param.sidr_req_rcvd; 3147 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3148 param->listen_id = listen_id; 3149 param->service_id = sidr_req_msg->service_id; 3150 param->bth_pkey = cm_get_bth_pkey(work); 3151 param->port = work->port->port_num; 3152 work->cm_event.private_data = &sidr_req_msg->private_data; 3153 } 3154 3155 static int cm_sidr_req_handler(struct cm_work *work) 3156 { 3157 struct ib_cm_id *cm_id; 3158 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3159 struct cm_sidr_req_msg *sidr_req_msg; 3160 struct ib_wc *wc; 3161 3162 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3163 if (IS_ERR(cm_id)) 3164 return PTR_ERR(cm_id); 3165 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3166 3167 /* Record SGID/SLID and request ID for lookup. */ 3168 sidr_req_msg = (struct cm_sidr_req_msg *) 3169 work->mad_recv_wc->recv_buf.mad; 3170 wc = work->mad_recv_wc->wc; 3171 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3172 cm_id_priv->av.dgid.global.interface_id = 0; 3173 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3174 work->mad_recv_wc->recv_buf.grh, 3175 &cm_id_priv->av); 3176 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3177 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3178 atomic_inc(&cm_id_priv->work_count); 3179 3180 spin_lock_irq(&cm.lock); 3181 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3182 if (cur_cm_id_priv) { 3183 spin_unlock_irq(&cm.lock); 3184 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3185 counter[CM_SIDR_REQ_COUNTER]); 3186 goto out; /* Duplicate message. */ 3187 } 3188 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3189 cur_cm_id_priv = cm_find_listen(cm_id->device, 3190 sidr_req_msg->service_id); 3191 if (!cur_cm_id_priv) { 3192 spin_unlock_irq(&cm.lock); 3193 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3194 goto out; /* No match. */ 3195 } 3196 atomic_inc(&cur_cm_id_priv->refcount); 3197 atomic_inc(&cm_id_priv->refcount); 3198 spin_unlock_irq(&cm.lock); 3199 3200 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3201 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3202 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3203 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3204 3205 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3206 cm_process_work(cm_id_priv, work); 3207 cm_deref_id(cur_cm_id_priv); 3208 return 0; 3209 out: 3210 ib_destroy_cm_id(&cm_id_priv->id); 3211 return -EINVAL; 3212 } 3213 3214 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3215 struct cm_id_private *cm_id_priv, 3216 struct ib_cm_sidr_rep_param *param) 3217 { 3218 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3219 cm_id_priv->tid); 3220 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3221 sidr_rep_msg->status = param->status; 3222 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3223 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3224 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3225 3226 if (param->info && param->info_length) 3227 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3228 3229 if (param->private_data && param->private_data_len) 3230 memcpy(sidr_rep_msg->private_data, param->private_data, 3231 param->private_data_len); 3232 } 3233 3234 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3235 struct ib_cm_sidr_rep_param *param) 3236 { 3237 struct cm_id_private *cm_id_priv; 3238 struct ib_mad_send_buf *msg; 3239 unsigned long flags; 3240 int ret; 3241 3242 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3243 (param->private_data && 3244 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3245 return -EINVAL; 3246 3247 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3248 spin_lock_irqsave(&cm_id_priv->lock, flags); 3249 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3250 ret = -EINVAL; 3251 goto error; 3252 } 3253 3254 ret = cm_alloc_msg(cm_id_priv, &msg); 3255 if (ret) 3256 goto error; 3257 3258 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3259 param); 3260 ret = ib_post_send_mad(msg, NULL); 3261 if (ret) { 3262 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3263 cm_free_msg(msg); 3264 return ret; 3265 } 3266 cm_id->state = IB_CM_IDLE; 3267 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3268 3269 spin_lock_irqsave(&cm.lock, flags); 3270 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3271 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3272 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3273 } 3274 spin_unlock_irqrestore(&cm.lock, flags); 3275 return 0; 3276 3277 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3278 return ret; 3279 } 3280 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3281 3282 static void cm_format_sidr_rep_event(struct cm_work *work) 3283 { 3284 struct cm_sidr_rep_msg *sidr_rep_msg; 3285 struct ib_cm_sidr_rep_event_param *param; 3286 3287 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3288 work->mad_recv_wc->recv_buf.mad; 3289 param = &work->cm_event.param.sidr_rep_rcvd; 3290 param->status = sidr_rep_msg->status; 3291 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3292 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3293 param->info = &sidr_rep_msg->info; 3294 param->info_len = sidr_rep_msg->info_length; 3295 work->cm_event.private_data = &sidr_rep_msg->private_data; 3296 } 3297 3298 static int cm_sidr_rep_handler(struct cm_work *work) 3299 { 3300 struct cm_sidr_rep_msg *sidr_rep_msg; 3301 struct cm_id_private *cm_id_priv; 3302 3303 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3304 work->mad_recv_wc->recv_buf.mad; 3305 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3306 if (!cm_id_priv) 3307 return -EINVAL; /* Unmatched reply. */ 3308 3309 spin_lock_irq(&cm_id_priv->lock); 3310 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3311 spin_unlock_irq(&cm_id_priv->lock); 3312 goto out; 3313 } 3314 cm_id_priv->id.state = IB_CM_IDLE; 3315 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3316 spin_unlock_irq(&cm_id_priv->lock); 3317 3318 cm_format_sidr_rep_event(work); 3319 cm_process_work(cm_id_priv, work); 3320 return 0; 3321 out: 3322 cm_deref_id(cm_id_priv); 3323 return -EINVAL; 3324 } 3325 3326 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3327 enum ib_wc_status wc_status) 3328 { 3329 struct cm_id_private *cm_id_priv; 3330 struct ib_cm_event cm_event; 3331 enum ib_cm_state state; 3332 int ret; 3333 3334 memset(&cm_event, 0, sizeof cm_event); 3335 cm_id_priv = msg->context[0]; 3336 3337 /* Discard old sends or ones without a response. */ 3338 spin_lock_irq(&cm_id_priv->lock); 3339 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3340 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3341 goto discard; 3342 3343 switch (state) { 3344 case IB_CM_REQ_SENT: 3345 case IB_CM_MRA_REQ_RCVD: 3346 cm_reset_to_idle(cm_id_priv); 3347 cm_event.event = IB_CM_REQ_ERROR; 3348 break; 3349 case IB_CM_REP_SENT: 3350 case IB_CM_MRA_REP_RCVD: 3351 cm_reset_to_idle(cm_id_priv); 3352 cm_event.event = IB_CM_REP_ERROR; 3353 break; 3354 case IB_CM_DREQ_SENT: 3355 cm_enter_timewait(cm_id_priv); 3356 cm_event.event = IB_CM_DREQ_ERROR; 3357 break; 3358 case IB_CM_SIDR_REQ_SENT: 3359 cm_id_priv->id.state = IB_CM_IDLE; 3360 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3361 break; 3362 default: 3363 goto discard; 3364 } 3365 spin_unlock_irq(&cm_id_priv->lock); 3366 cm_event.param.send_status = wc_status; 3367 3368 /* No other events can occur on the cm_id at this point. */ 3369 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3370 cm_free_msg(msg); 3371 if (ret) 3372 ib_destroy_cm_id(&cm_id_priv->id); 3373 return; 3374 discard: 3375 spin_unlock_irq(&cm_id_priv->lock); 3376 cm_free_msg(msg); 3377 } 3378 3379 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3380 struct ib_mad_send_wc *mad_send_wc) 3381 { 3382 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3383 struct cm_port *port; 3384 u16 attr_index; 3385 3386 port = mad_agent->context; 3387 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3388 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3389 3390 /* 3391 * If the send was in response to a received message (context[0] is not 3392 * set to a cm_id), and is not a REJ, then it is a send that was 3393 * manually retried. 3394 */ 3395 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3396 msg->retries = 1; 3397 3398 atomic_long_add(1 + msg->retries, 3399 &port->counter_group[CM_XMIT].counter[attr_index]); 3400 if (msg->retries) 3401 atomic_long_add(msg->retries, 3402 &port->counter_group[CM_XMIT_RETRIES]. 3403 counter[attr_index]); 3404 3405 switch (mad_send_wc->status) { 3406 case IB_WC_SUCCESS: 3407 case IB_WC_WR_FLUSH_ERR: 3408 cm_free_msg(msg); 3409 break; 3410 default: 3411 if (msg->context[0] && msg->context[1]) 3412 cm_process_send_error(msg, mad_send_wc->status); 3413 else 3414 cm_free_msg(msg); 3415 break; 3416 } 3417 } 3418 3419 static void cm_work_handler(struct work_struct *_work) 3420 { 3421 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3422 int ret; 3423 3424 switch (work->cm_event.event) { 3425 case IB_CM_REQ_RECEIVED: 3426 ret = cm_req_handler(work); 3427 break; 3428 case IB_CM_MRA_RECEIVED: 3429 ret = cm_mra_handler(work); 3430 break; 3431 case IB_CM_REJ_RECEIVED: 3432 ret = cm_rej_handler(work); 3433 break; 3434 case IB_CM_REP_RECEIVED: 3435 ret = cm_rep_handler(work); 3436 break; 3437 case IB_CM_RTU_RECEIVED: 3438 ret = cm_rtu_handler(work); 3439 break; 3440 case IB_CM_USER_ESTABLISHED: 3441 ret = cm_establish_handler(work); 3442 break; 3443 case IB_CM_DREQ_RECEIVED: 3444 ret = cm_dreq_handler(work); 3445 break; 3446 case IB_CM_DREP_RECEIVED: 3447 ret = cm_drep_handler(work); 3448 break; 3449 case IB_CM_SIDR_REQ_RECEIVED: 3450 ret = cm_sidr_req_handler(work); 3451 break; 3452 case IB_CM_SIDR_REP_RECEIVED: 3453 ret = cm_sidr_rep_handler(work); 3454 break; 3455 case IB_CM_LAP_RECEIVED: 3456 ret = cm_lap_handler(work); 3457 break; 3458 case IB_CM_APR_RECEIVED: 3459 ret = cm_apr_handler(work); 3460 break; 3461 case IB_CM_TIMEWAIT_EXIT: 3462 ret = cm_timewait_handler(work); 3463 break; 3464 default: 3465 ret = -EINVAL; 3466 break; 3467 } 3468 if (ret) 3469 cm_free_work(work); 3470 } 3471 3472 static int cm_establish(struct ib_cm_id *cm_id) 3473 { 3474 struct cm_id_private *cm_id_priv; 3475 struct cm_work *work; 3476 unsigned long flags; 3477 int ret = 0; 3478 struct cm_device *cm_dev; 3479 3480 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3481 if (!cm_dev) 3482 return -ENODEV; 3483 3484 work = kmalloc(sizeof *work, GFP_ATOMIC); 3485 if (!work) 3486 return -ENOMEM; 3487 3488 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3489 spin_lock_irqsave(&cm_id_priv->lock, flags); 3490 switch (cm_id->state) 3491 { 3492 case IB_CM_REP_SENT: 3493 case IB_CM_MRA_REP_RCVD: 3494 cm_id->state = IB_CM_ESTABLISHED; 3495 break; 3496 case IB_CM_ESTABLISHED: 3497 ret = -EISCONN; 3498 break; 3499 default: 3500 ret = -EINVAL; 3501 break; 3502 } 3503 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3504 3505 if (ret) { 3506 kfree(work); 3507 goto out; 3508 } 3509 3510 /* 3511 * The CM worker thread may try to destroy the cm_id before it 3512 * can execute this work item. To prevent potential deadlock, 3513 * we need to find the cm_id once we're in the context of the 3514 * worker thread, rather than holding a reference on it. 3515 */ 3516 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3517 work->local_id = cm_id->local_id; 3518 work->remote_id = cm_id->remote_id; 3519 work->mad_recv_wc = NULL; 3520 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3521 3522 /* Check if the device started its remove_one */ 3523 spin_lock_irqsave(&cm.lock, flags); 3524 if (!cm_dev->going_down) { 3525 queue_delayed_work(cm.wq, &work->work, 0); 3526 } else { 3527 kfree(work); 3528 ret = -ENODEV; 3529 } 3530 spin_unlock_irqrestore(&cm.lock, flags); 3531 3532 out: 3533 return ret; 3534 } 3535 3536 static int cm_migrate(struct ib_cm_id *cm_id) 3537 { 3538 struct cm_id_private *cm_id_priv; 3539 struct cm_av tmp_av; 3540 unsigned long flags; 3541 int tmp_send_port_not_ready; 3542 int ret = 0; 3543 3544 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3545 spin_lock_irqsave(&cm_id_priv->lock, flags); 3546 if (cm_id->state == IB_CM_ESTABLISHED && 3547 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3548 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3549 cm_id->lap_state = IB_CM_LAP_IDLE; 3550 /* Swap address vector */ 3551 tmp_av = cm_id_priv->av; 3552 cm_id_priv->av = cm_id_priv->alt_av; 3553 cm_id_priv->alt_av = tmp_av; 3554 /* Swap port send ready state */ 3555 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3556 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3557 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3558 } else 3559 ret = -EINVAL; 3560 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3561 3562 return ret; 3563 } 3564 3565 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3566 { 3567 int ret; 3568 3569 switch (event) { 3570 case IB_EVENT_COMM_EST: 3571 ret = cm_establish(cm_id); 3572 break; 3573 case IB_EVENT_PATH_MIG: 3574 ret = cm_migrate(cm_id); 3575 break; 3576 default: 3577 ret = -EINVAL; 3578 } 3579 return ret; 3580 } 3581 EXPORT_SYMBOL(ib_cm_notify); 3582 3583 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3584 struct ib_mad_send_buf *send_buf, 3585 struct ib_mad_recv_wc *mad_recv_wc) 3586 { 3587 struct cm_port *port = mad_agent->context; 3588 struct cm_work *work; 3589 enum ib_cm_event_type event; 3590 u16 attr_id; 3591 int paths = 0; 3592 int going_down = 0; 3593 3594 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3595 case CM_REQ_ATTR_ID: 3596 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3597 alt_local_lid != 0); 3598 event = IB_CM_REQ_RECEIVED; 3599 break; 3600 case CM_MRA_ATTR_ID: 3601 event = IB_CM_MRA_RECEIVED; 3602 break; 3603 case CM_REJ_ATTR_ID: 3604 event = IB_CM_REJ_RECEIVED; 3605 break; 3606 case CM_REP_ATTR_ID: 3607 event = IB_CM_REP_RECEIVED; 3608 break; 3609 case CM_RTU_ATTR_ID: 3610 event = IB_CM_RTU_RECEIVED; 3611 break; 3612 case CM_DREQ_ATTR_ID: 3613 event = IB_CM_DREQ_RECEIVED; 3614 break; 3615 case CM_DREP_ATTR_ID: 3616 event = IB_CM_DREP_RECEIVED; 3617 break; 3618 case CM_SIDR_REQ_ATTR_ID: 3619 event = IB_CM_SIDR_REQ_RECEIVED; 3620 break; 3621 case CM_SIDR_REP_ATTR_ID: 3622 event = IB_CM_SIDR_REP_RECEIVED; 3623 break; 3624 case CM_LAP_ATTR_ID: 3625 paths = 1; 3626 event = IB_CM_LAP_RECEIVED; 3627 break; 3628 case CM_APR_ATTR_ID: 3629 event = IB_CM_APR_RECEIVED; 3630 break; 3631 default: 3632 ib_free_recv_mad(mad_recv_wc); 3633 return; 3634 } 3635 3636 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3637 atomic_long_inc(&port->counter_group[CM_RECV]. 3638 counter[attr_id - CM_ATTR_ID_OFFSET]); 3639 3640 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3641 GFP_KERNEL); 3642 if (!work) { 3643 ib_free_recv_mad(mad_recv_wc); 3644 return; 3645 } 3646 3647 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3648 work->cm_event.event = event; 3649 work->mad_recv_wc = mad_recv_wc; 3650 work->port = port; 3651 3652 /* Check if the device started its remove_one */ 3653 spin_lock_irq(&cm.lock); 3654 if (!port->cm_dev->going_down) 3655 queue_delayed_work(cm.wq, &work->work, 0); 3656 else 3657 going_down = 1; 3658 spin_unlock_irq(&cm.lock); 3659 3660 if (going_down) { 3661 kfree(work); 3662 ib_free_recv_mad(mad_recv_wc); 3663 } 3664 } 3665 3666 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3667 struct ib_qp_attr *qp_attr, 3668 int *qp_attr_mask) 3669 { 3670 unsigned long flags; 3671 int ret; 3672 3673 spin_lock_irqsave(&cm_id_priv->lock, flags); 3674 switch (cm_id_priv->id.state) { 3675 case IB_CM_REQ_SENT: 3676 case IB_CM_MRA_REQ_RCVD: 3677 case IB_CM_REQ_RCVD: 3678 case IB_CM_MRA_REQ_SENT: 3679 case IB_CM_REP_RCVD: 3680 case IB_CM_MRA_REP_SENT: 3681 case IB_CM_REP_SENT: 3682 case IB_CM_MRA_REP_RCVD: 3683 case IB_CM_ESTABLISHED: 3684 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3685 IB_QP_PKEY_INDEX | IB_QP_PORT; 3686 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3687 if (cm_id_priv->responder_resources) 3688 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3689 IB_ACCESS_REMOTE_ATOMIC; 3690 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3691 qp_attr->port_num = cm_id_priv->av.port->port_num; 3692 ret = 0; 3693 break; 3694 default: 3695 ret = -EINVAL; 3696 break; 3697 } 3698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3699 return ret; 3700 } 3701 3702 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3703 struct ib_qp_attr *qp_attr, 3704 int *qp_attr_mask) 3705 { 3706 unsigned long flags; 3707 int ret; 3708 3709 spin_lock_irqsave(&cm_id_priv->lock, flags); 3710 switch (cm_id_priv->id.state) { 3711 case IB_CM_REQ_RCVD: 3712 case IB_CM_MRA_REQ_SENT: 3713 case IB_CM_REP_RCVD: 3714 case IB_CM_MRA_REP_SENT: 3715 case IB_CM_REP_SENT: 3716 case IB_CM_MRA_REP_RCVD: 3717 case IB_CM_ESTABLISHED: 3718 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3719 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3720 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3721 qp_attr->path_mtu = cm_id_priv->path_mtu; 3722 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3723 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3724 if (cm_id_priv->qp_type == IB_QPT_RC || 3725 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3726 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3727 IB_QP_MIN_RNR_TIMER; 3728 qp_attr->max_dest_rd_atomic = 3729 cm_id_priv->responder_resources; 3730 qp_attr->min_rnr_timer = 0; 3731 } 3732 if (cm_id_priv->alt_av.ah_attr.dlid) { 3733 *qp_attr_mask |= IB_QP_ALT_PATH; 3734 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3735 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3736 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3737 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3738 } 3739 ret = 0; 3740 break; 3741 default: 3742 ret = -EINVAL; 3743 break; 3744 } 3745 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3746 return ret; 3747 } 3748 3749 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3750 struct ib_qp_attr *qp_attr, 3751 int *qp_attr_mask) 3752 { 3753 unsigned long flags; 3754 int ret; 3755 3756 spin_lock_irqsave(&cm_id_priv->lock, flags); 3757 switch (cm_id_priv->id.state) { 3758 /* Allow transition to RTS before sending REP */ 3759 case IB_CM_REQ_RCVD: 3760 case IB_CM_MRA_REQ_SENT: 3761 3762 case IB_CM_REP_RCVD: 3763 case IB_CM_MRA_REP_SENT: 3764 case IB_CM_REP_SENT: 3765 case IB_CM_MRA_REP_RCVD: 3766 case IB_CM_ESTABLISHED: 3767 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3768 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3769 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3770 switch (cm_id_priv->qp_type) { 3771 case IB_QPT_RC: 3772 case IB_QPT_XRC_INI: 3773 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3774 IB_QP_MAX_QP_RD_ATOMIC; 3775 qp_attr->retry_cnt = cm_id_priv->retry_count; 3776 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3777 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3778 /* fall through */ 3779 case IB_QPT_XRC_TGT: 3780 *qp_attr_mask |= IB_QP_TIMEOUT; 3781 qp_attr->timeout = cm_id_priv->av.timeout; 3782 break; 3783 default: 3784 break; 3785 } 3786 if (cm_id_priv->alt_av.ah_attr.dlid) { 3787 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3788 qp_attr->path_mig_state = IB_MIG_REARM; 3789 } 3790 } else { 3791 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3792 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3793 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3794 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3795 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3796 qp_attr->path_mig_state = IB_MIG_REARM; 3797 } 3798 ret = 0; 3799 break; 3800 default: 3801 ret = -EINVAL; 3802 break; 3803 } 3804 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3805 return ret; 3806 } 3807 3808 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3809 struct ib_qp_attr *qp_attr, 3810 int *qp_attr_mask) 3811 { 3812 struct cm_id_private *cm_id_priv; 3813 int ret; 3814 3815 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3816 switch (qp_attr->qp_state) { 3817 case IB_QPS_INIT: 3818 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3819 break; 3820 case IB_QPS_RTR: 3821 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3822 break; 3823 case IB_QPS_RTS: 3824 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3825 break; 3826 default: 3827 ret = -EINVAL; 3828 break; 3829 } 3830 return ret; 3831 } 3832 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3833 3834 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3835 char *buf) 3836 { 3837 struct cm_counter_group *group; 3838 struct cm_counter_attribute *cm_attr; 3839 3840 group = container_of(obj, struct cm_counter_group, obj); 3841 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3842 3843 return sprintf(buf, "%ld\n", 3844 atomic_long_read(&group->counter[cm_attr->index])); 3845 } 3846 3847 static const struct sysfs_ops cm_counter_ops = { 3848 .show = cm_show_counter 3849 }; 3850 3851 static struct kobj_type cm_counter_obj_type = { 3852 .sysfs_ops = &cm_counter_ops, 3853 .default_attrs = cm_counter_default_attrs 3854 }; 3855 3856 static void cm_release_port_obj(struct kobject *obj) 3857 { 3858 struct cm_port *cm_port; 3859 3860 cm_port = container_of(obj, struct cm_port, port_obj); 3861 kfree(cm_port); 3862 } 3863 3864 static struct kobj_type cm_port_obj_type = { 3865 .release = cm_release_port_obj 3866 }; 3867 3868 static char *cm_devnode(struct device *dev, umode_t *mode) 3869 { 3870 if (mode) 3871 *mode = 0666; 3872 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3873 } 3874 3875 struct class cm_class = { 3876 .owner = THIS_MODULE, 3877 .name = "infiniband_cm", 3878 .devnode = cm_devnode, 3879 }; 3880 EXPORT_SYMBOL(cm_class); 3881 3882 static int cm_create_port_fs(struct cm_port *port) 3883 { 3884 int i, ret; 3885 3886 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3887 &port->cm_dev->device->kobj, 3888 "%d", port->port_num); 3889 if (ret) { 3890 kfree(port); 3891 return ret; 3892 } 3893 3894 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3895 ret = kobject_init_and_add(&port->counter_group[i].obj, 3896 &cm_counter_obj_type, 3897 &port->port_obj, 3898 "%s", counter_group_names[i]); 3899 if (ret) 3900 goto error; 3901 } 3902 3903 return 0; 3904 3905 error: 3906 while (i--) 3907 kobject_put(&port->counter_group[i].obj); 3908 kobject_put(&port->port_obj); 3909 return ret; 3910 3911 } 3912 3913 static void cm_remove_port_fs(struct cm_port *port) 3914 { 3915 int i; 3916 3917 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3918 kobject_put(&port->counter_group[i].obj); 3919 3920 kobject_put(&port->port_obj); 3921 } 3922 3923 static void cm_add_one(struct ib_device *ib_device) 3924 { 3925 struct cm_device *cm_dev; 3926 struct cm_port *port; 3927 struct ib_mad_reg_req reg_req = { 3928 .mgmt_class = IB_MGMT_CLASS_CM, 3929 .mgmt_class_version = IB_CM_CLASS_VERSION, 3930 }; 3931 struct ib_port_modify port_modify = { 3932 .set_port_cap_mask = IB_PORT_CM_SUP 3933 }; 3934 unsigned long flags; 3935 int ret; 3936 int count = 0; 3937 u8 i; 3938 3939 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3940 ib_device->phys_port_cnt, GFP_KERNEL); 3941 if (!cm_dev) 3942 return; 3943 3944 cm_dev->ib_device = ib_device; 3945 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 3946 cm_dev->going_down = 0; 3947 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3948 MKDEV(0, 0), NULL, 3949 "%s", ib_device->name); 3950 if (IS_ERR(cm_dev->device)) { 3951 kfree(cm_dev); 3952 return; 3953 } 3954 3955 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3956 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3957 if (!rdma_cap_ib_cm(ib_device, i)) 3958 continue; 3959 3960 port = kzalloc(sizeof *port, GFP_KERNEL); 3961 if (!port) 3962 goto error1; 3963 3964 cm_dev->port[i-1] = port; 3965 port->cm_dev = cm_dev; 3966 port->port_num = i; 3967 3968 INIT_LIST_HEAD(&port->cm_priv_prim_list); 3969 INIT_LIST_HEAD(&port->cm_priv_altr_list); 3970 3971 ret = cm_create_port_fs(port); 3972 if (ret) 3973 goto error1; 3974 3975 port->mad_agent = ib_register_mad_agent(ib_device, i, 3976 IB_QPT_GSI, 3977 ®_req, 3978 0, 3979 cm_send_handler, 3980 cm_recv_handler, 3981 port, 3982 0); 3983 if (IS_ERR(port->mad_agent)) 3984 goto error2; 3985 3986 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3987 if (ret) 3988 goto error3; 3989 3990 count++; 3991 } 3992 3993 if (!count) 3994 goto free; 3995 3996 ib_set_client_data(ib_device, &cm_client, cm_dev); 3997 3998 write_lock_irqsave(&cm.device_lock, flags); 3999 list_add_tail(&cm_dev->list, &cm.device_list); 4000 write_unlock_irqrestore(&cm.device_lock, flags); 4001 return; 4002 4003 error3: 4004 ib_unregister_mad_agent(port->mad_agent); 4005 error2: 4006 cm_remove_port_fs(port); 4007 error1: 4008 port_modify.set_port_cap_mask = 0; 4009 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4010 while (--i) { 4011 if (!rdma_cap_ib_cm(ib_device, i)) 4012 continue; 4013 4014 port = cm_dev->port[i-1]; 4015 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4016 ib_unregister_mad_agent(port->mad_agent); 4017 cm_remove_port_fs(port); 4018 } 4019 free: 4020 device_unregister(cm_dev->device); 4021 kfree(cm_dev); 4022 } 4023 4024 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4025 { 4026 struct cm_device *cm_dev = client_data; 4027 struct cm_port *port; 4028 struct cm_id_private *cm_id_priv; 4029 struct ib_mad_agent *cur_mad_agent; 4030 struct ib_port_modify port_modify = { 4031 .clr_port_cap_mask = IB_PORT_CM_SUP 4032 }; 4033 unsigned long flags; 4034 int i; 4035 4036 if (!cm_dev) 4037 return; 4038 4039 write_lock_irqsave(&cm.device_lock, flags); 4040 list_del(&cm_dev->list); 4041 write_unlock_irqrestore(&cm.device_lock, flags); 4042 4043 spin_lock_irq(&cm.lock); 4044 cm_dev->going_down = 1; 4045 spin_unlock_irq(&cm.lock); 4046 4047 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4048 if (!rdma_cap_ib_cm(ib_device, i)) 4049 continue; 4050 4051 port = cm_dev->port[i-1]; 4052 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4053 /* Mark all the cm_id's as not valid */ 4054 spin_lock_irq(&cm.lock); 4055 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4056 cm_id_priv->altr_send_port_not_ready = 1; 4057 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4058 cm_id_priv->prim_send_port_not_ready = 1; 4059 spin_unlock_irq(&cm.lock); 4060 /* 4061 * We flush the queue here after the going_down set, this 4062 * verify that no new works will be queued in the recv handler, 4063 * after that we can call the unregister_mad_agent 4064 */ 4065 flush_workqueue(cm.wq); 4066 spin_lock_irq(&cm.state_lock); 4067 cur_mad_agent = port->mad_agent; 4068 port->mad_agent = NULL; 4069 spin_unlock_irq(&cm.state_lock); 4070 ib_unregister_mad_agent(cur_mad_agent); 4071 cm_remove_port_fs(port); 4072 } 4073 4074 device_unregister(cm_dev->device); 4075 kfree(cm_dev); 4076 } 4077 4078 static int __init ib_cm_init(void) 4079 { 4080 int ret; 4081 4082 memset(&cm, 0, sizeof cm); 4083 INIT_LIST_HEAD(&cm.device_list); 4084 rwlock_init(&cm.device_lock); 4085 spin_lock_init(&cm.lock); 4086 spin_lock_init(&cm.state_lock); 4087 cm.listen_service_table = RB_ROOT; 4088 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4089 cm.remote_id_table = RB_ROOT; 4090 cm.remote_qp_table = RB_ROOT; 4091 cm.remote_sidr_table = RB_ROOT; 4092 idr_init(&cm.local_id_table); 4093 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4094 INIT_LIST_HEAD(&cm.timewait_list); 4095 4096 ret = class_register(&cm_class); 4097 if (ret) { 4098 ret = -ENOMEM; 4099 goto error1; 4100 } 4101 4102 cm.wq = create_workqueue("ib_cm"); 4103 if (!cm.wq) { 4104 ret = -ENOMEM; 4105 goto error2; 4106 } 4107 4108 ret = ib_register_client(&cm_client); 4109 if (ret) 4110 goto error3; 4111 4112 return 0; 4113 error3: 4114 destroy_workqueue(cm.wq); 4115 error2: 4116 class_unregister(&cm_class); 4117 error1: 4118 idr_destroy(&cm.local_id_table); 4119 return ret; 4120 } 4121 4122 static void __exit ib_cm_cleanup(void) 4123 { 4124 struct cm_timewait_info *timewait_info, *tmp; 4125 4126 spin_lock_irq(&cm.lock); 4127 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4128 cancel_delayed_work(&timewait_info->work.work); 4129 spin_unlock_irq(&cm.lock); 4130 4131 ib_unregister_client(&cm_client); 4132 destroy_workqueue(cm.wq); 4133 4134 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4135 cancel_delayed_work_sync(&timewait_info->work.work); 4136 list_del(&timewait_info->list); 4137 kfree(timewait_info); 4138 } 4139 4140 class_unregister(&cm_class); 4141 idr_destroy(&cm.local_id_table); 4142 } 4143 4144 module_init_order(ib_cm_init, SI_ORDER_SECOND); 4145 module_exit_order(ib_cm_cleanup, SI_ORDER_FIRST); 4146 4147