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 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD$"); 40 41#include <linux/completion.h> 42#include <linux/dma-mapping.h> 43#include <linux/device.h> 44#include <linux/module.h> 45#include <linux/err.h> 46#include <linux/idr.h> 47#include <linux/interrupt.h> 48#include <linux/random.h> 49#include <linux/rbtree.h> 50#include <linux/spinlock.h> 51#include <linux/slab.h> 52#include <linux/sysfs.h> 53#include <linux/workqueue.h> 54#include <linux/kdev_t.h> 55#include <linux/etherdevice.h> 56 57#include <asm/atomic-long.h> 58 59#include <rdma/ib_cache.h> 60#include <rdma/ib_cm.h> 61#include "cm_msgs.h" 62 63MODULE_AUTHOR("Sean Hefty"); 64MODULE_DESCRIPTION("InfiniBand CM"); 65MODULE_LICENSE("Dual BSD/GPL"); 66 67static void cm_add_one(struct ib_device *device); 68static void cm_remove_one(struct ib_device *device, void *client_data); 69 70static struct ib_client cm_client = { 71 .name = "cm", 72 .add = cm_add_one, 73 .remove = cm_remove_one 74}; 75 76static struct ib_cm { 77 spinlock_t lock; 78 struct list_head device_list; 79 rwlock_t device_lock; 80 struct rb_root listen_service_table; 81 u64 listen_service_id; 82 /* struct rb_root peer_service_table; todo: fix peer to peer */ 83 struct rb_root remote_qp_table; 84 struct rb_root remote_id_table; 85 struct rb_root remote_sidr_table; 86 struct idr local_id_table; 87 __be32 random_id_operand; 88 struct list_head timewait_list; 89 struct workqueue_struct *wq; 90 /* Sync on cm change port state */ 91 spinlock_t state_lock; 92} cm; 93 94/* Counter indexes ordered by attribute ID */ 95enum { 96 CM_REQ_COUNTER, 97 CM_MRA_COUNTER, 98 CM_REJ_COUNTER, 99 CM_REP_COUNTER, 100 CM_RTU_COUNTER, 101 CM_DREQ_COUNTER, 102 CM_DREP_COUNTER, 103 CM_SIDR_REQ_COUNTER, 104 CM_SIDR_REP_COUNTER, 105 CM_LAP_COUNTER, 106 CM_APR_COUNTER, 107 CM_ATTR_COUNT, 108 CM_ATTR_ID_OFFSET = 0x0010, 109}; 110 111enum { 112 CM_XMIT, 113 CM_XMIT_RETRIES, 114 CM_RECV, 115 CM_RECV_DUPLICATES, 116 CM_COUNTER_GROUPS 117}; 118 119static char const counter_group_names[CM_COUNTER_GROUPS] 120 [sizeof("cm_rx_duplicates")] = { 121 "cm_tx_msgs", "cm_tx_retries", 122 "cm_rx_msgs", "cm_rx_duplicates" 123}; 124 125struct cm_counter_group { 126 struct kobject obj; 127 atomic_long_t counter[CM_ATTR_COUNT]; 128}; 129 130struct cm_counter_attribute { 131 struct attribute attr; 132 int index; 133}; 134 135#define CM_COUNTER_ATTR(_name, _index) \ 136struct cm_counter_attribute cm_##_name##_counter_attr = { \ 137 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 138 .index = _index \ 139} 140 141static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 142static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 143static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 144static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 145static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 146static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 147static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 148static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 149static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 150static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 151static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 152 153static struct attribute *cm_counter_default_attrs[] = { 154 &cm_req_counter_attr.attr, 155 &cm_mra_counter_attr.attr, 156 &cm_rej_counter_attr.attr, 157 &cm_rep_counter_attr.attr, 158 &cm_rtu_counter_attr.attr, 159 &cm_dreq_counter_attr.attr, 160 &cm_drep_counter_attr.attr, 161 &cm_sidr_req_counter_attr.attr, 162 &cm_sidr_rep_counter_attr.attr, 163 &cm_lap_counter_attr.attr, 164 &cm_apr_counter_attr.attr, 165 NULL 166}; 167 168struct cm_port { 169 struct cm_device *cm_dev; 170 struct ib_mad_agent *mad_agent; 171 struct kobject port_obj; 172 u8 port_num; 173 struct list_head cm_priv_prim_list; 174 struct list_head cm_priv_altr_list; 175 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 176}; 177 178struct cm_device { 179 struct list_head list; 180 struct ib_device *ib_device; 181 struct device *device; 182 u8 ack_delay; 183 int going_down; 184 struct cm_port *port[0]; 185}; 186 187struct cm_av { 188 struct cm_port *port; 189 union ib_gid dgid; 190 struct ib_ah_attr ah_attr; 191 u16 pkey_index; 192 u8 timeout; 193}; 194 195struct cm_work { 196 struct delayed_work work; 197 struct list_head list; 198 struct cm_port *port; 199 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 200 __be32 local_id; /* Established / timewait */ 201 __be32 remote_id; 202 struct ib_cm_event cm_event; 203 struct ib_sa_path_rec path[0]; 204}; 205 206struct cm_timewait_info { 207 struct cm_work work; /* Must be first. */ 208 struct list_head list; 209 struct rb_node remote_qp_node; 210 struct rb_node remote_id_node; 211 __be64 remote_ca_guid; 212 __be32 remote_qpn; 213 u8 inserted_remote_qp; 214 u8 inserted_remote_id; 215}; 216 217struct cm_id_private { 218 struct ib_cm_id id; 219 220 struct rb_node service_node; 221 struct rb_node sidr_id_node; 222 spinlock_t lock; /* Do not acquire inside cm.lock */ 223 struct completion comp; 224 atomic_t refcount; 225 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 226 * Protected by the cm.lock spinlock. */ 227 int listen_sharecount; 228 229 struct ib_mad_send_buf *msg; 230 struct cm_timewait_info *timewait_info; 231 /* todo: use alternate port on send failure */ 232 struct cm_av av; 233 struct cm_av alt_av; 234 235 void *private_data; 236 __be64 tid; 237 __be32 local_qpn; 238 __be32 remote_qpn; 239 enum ib_qp_type qp_type; 240 __be32 sq_psn; 241 __be32 rq_psn; 242 int timeout_ms; 243 enum ib_mtu path_mtu; 244 __be16 pkey; 245 u8 private_data_len; 246 u8 max_cm_retries; 247 u8 peer_to_peer; 248 u8 responder_resources; 249 u8 initiator_depth; 250 u8 retry_count; 251 u8 rnr_retry_count; 252 u8 service_timeout; 253 u8 target_ack_delay; 254 255 struct list_head prim_list; 256 struct list_head altr_list; 257 /* Indicates that the send port mad is registered and av is set */ 258 int prim_send_port_not_ready; 259 int altr_send_port_not_ready; 260 261 struct list_head work_list; 262 atomic_t work_count; 263}; 264 265static void cm_work_handler(struct work_struct *work); 266 267static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 268{ 269 if (atomic_dec_and_test(&cm_id_priv->refcount)) 270 complete(&cm_id_priv->comp); 271} 272 273static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 274 struct ib_mad_send_buf **msg) 275{ 276 struct ib_mad_agent *mad_agent; 277 struct ib_mad_send_buf *m; 278 struct ib_ah *ah; 279 struct cm_av *av; 280 unsigned long flags, flags2; 281 int ret = 0; 282 283 /* don't let the port to be released till the agent is down */ 284 spin_lock_irqsave(&cm.state_lock, flags2); 285 spin_lock_irqsave(&cm.lock, flags); 286 if (!cm_id_priv->prim_send_port_not_ready) 287 av = &cm_id_priv->av; 288 else if (!cm_id_priv->altr_send_port_not_ready && 289 (cm_id_priv->alt_av.port)) 290 av = &cm_id_priv->alt_av; 291 else { 292 pr_info("%s: not valid CM id\n", __func__); 293 ret = -ENODEV; 294 spin_unlock_irqrestore(&cm.lock, flags); 295 goto out; 296 } 297 spin_unlock_irqrestore(&cm.lock, flags); 298 /* Make sure the port haven't released the mad yet */ 299 mad_agent = cm_id_priv->av.port->mad_agent; 300 if (!mad_agent) { 301 pr_info("%s: not a valid MAD agent\n", __func__); 302 ret = -ENODEV; 303 goto out; 304 } 305 ah = ib_create_ah(mad_agent->qp->pd, &av->ah_attr); 306 if (IS_ERR(ah)) { 307 ret = PTR_ERR(ah); 308 goto out; 309 } 310 311 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 312 av->pkey_index, 313 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 314 GFP_ATOMIC, 315 IB_MGMT_BASE_VERSION); 316 if (IS_ERR(m)) { 317 ib_destroy_ah(ah); 318 ret = PTR_ERR(m); 319 goto out; 320 } 321 322 /* Timeout set by caller if response is expected. */ 323 m->ah = ah; 324 m->retries = cm_id_priv->max_cm_retries; 325 326 atomic_inc(&cm_id_priv->refcount); 327 m->context[0] = cm_id_priv; 328 *msg = m; 329 330out: 331 spin_unlock_irqrestore(&cm.state_lock, flags2); 332 return ret; 333} 334 335static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port, 336 struct ib_mad_recv_wc *mad_recv_wc) 337{ 338 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 339 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 340 GFP_ATOMIC, 341 IB_MGMT_BASE_VERSION); 342} 343 344static int cm_create_response_msg_ah(struct cm_port *port, 345 struct ib_mad_recv_wc *mad_recv_wc, 346 struct ib_mad_send_buf *msg) 347{ 348 struct ib_ah *ah; 349 350 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 351 mad_recv_wc->recv_buf.grh, port->port_num); 352 if (IS_ERR(ah)) 353 return PTR_ERR(ah); 354 355 msg->ah = ah; 356 return 0; 357} 358 359static void cm_free_msg(struct ib_mad_send_buf *msg) 360{ 361 if (msg->ah) 362 ib_destroy_ah(msg->ah); 363 if (msg->context[0]) 364 cm_deref_id(msg->context[0]); 365 ib_free_send_mad(msg); 366} 367 368static int cm_alloc_response_msg(struct cm_port *port, 369 struct ib_mad_recv_wc *mad_recv_wc, 370 struct ib_mad_send_buf **msg) 371{ 372 struct ib_mad_send_buf *m; 373 int ret; 374 375 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc); 376 if (IS_ERR(m)) 377 return PTR_ERR(m); 378 379 ret = cm_create_response_msg_ah(port, mad_recv_wc, m); 380 if (ret) { 381 cm_free_msg(m); 382 return ret; 383 } 384 385 *msg = m; 386 return 0; 387} 388 389static void * cm_copy_private_data(const void *private_data, 390 u8 private_data_len) 391{ 392 void *data; 393 394 if (!private_data || !private_data_len) 395 return NULL; 396 397 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 398 if (!data) 399 return ERR_PTR(-ENOMEM); 400 401 return data; 402} 403 404static void cm_set_private_data(struct cm_id_private *cm_id_priv, 405 void *private_data, u8 private_data_len) 406{ 407 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 408 kfree(cm_id_priv->private_data); 409 410 cm_id_priv->private_data = private_data; 411 cm_id_priv->private_data_len = private_data_len; 412} 413 414static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 415 struct ib_grh *grh, struct cm_av *av) 416{ 417 av->port = port; 418 av->pkey_index = wc->pkey_index; 419 return ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 420 grh, &av->ah_attr); 421} 422 423static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av, 424 struct cm_id_private *cm_id_priv) 425{ 426 struct cm_device *cm_dev; 427 struct cm_port *port = NULL; 428 unsigned long flags; 429 int ret; 430 u8 p; 431 struct net_device *ndev = ib_get_ndev_from_path(path); 432 433 read_lock_irqsave(&cm.device_lock, flags); 434 list_for_each_entry(cm_dev, &cm.device_list, list) { 435 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 436 path->gid_type, ndev, &p, NULL)) { 437 port = cm_dev->port[p-1]; 438 break; 439 } 440 } 441 read_unlock_irqrestore(&cm.device_lock, flags); 442 443 if (ndev) 444 dev_put(ndev); 445 446 if (!port) 447 return -EINVAL; 448 449 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 450 be16_to_cpu(path->pkey), &av->pkey_index); 451 if (ret) 452 return ret; 453 454 av->port = port; 455 ret = ib_init_ah_from_path(cm_dev->ib_device, port->port_num, 456 path, &av->ah_attr); 457 if (ret) 458 return ret; 459 460 av->timeout = path->packet_life_time + 1; 461 462 spin_lock_irqsave(&cm.lock, flags); 463 if (&cm_id_priv->av == av) 464 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 465 else if (&cm_id_priv->alt_av == av) 466 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 467 else 468 ret = -EINVAL; 469 470 spin_unlock_irqrestore(&cm.lock, flags); 471 472 return ret; 473} 474 475static int cm_alloc_id(struct cm_id_private *cm_id_priv) 476{ 477 unsigned long flags; 478 int id; 479 480 idr_preload(GFP_KERNEL); 481 spin_lock_irqsave(&cm.lock, flags); 482 483 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 484 485 spin_unlock_irqrestore(&cm.lock, flags); 486 idr_preload_end(); 487 488 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 489 return id < 0 ? id : 0; 490} 491 492static void cm_free_id(__be32 local_id) 493{ 494 spin_lock_irq(&cm.lock); 495 idr_remove(&cm.local_id_table, 496 (__force int) (local_id ^ cm.random_id_operand)); 497 spin_unlock_irq(&cm.lock); 498} 499 500static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 501{ 502 struct cm_id_private *cm_id_priv; 503 504 cm_id_priv = idr_find(&cm.local_id_table, 505 (__force int) (local_id ^ cm.random_id_operand)); 506 if (cm_id_priv) { 507 if (cm_id_priv->id.remote_id == remote_id) 508 atomic_inc(&cm_id_priv->refcount); 509 else 510 cm_id_priv = NULL; 511 } 512 513 return cm_id_priv; 514} 515 516static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 517{ 518 struct cm_id_private *cm_id_priv; 519 520 spin_lock_irq(&cm.lock); 521 cm_id_priv = cm_get_id(local_id, remote_id); 522 spin_unlock_irq(&cm.lock); 523 524 return cm_id_priv; 525} 526 527/* 528 * Trivial helpers to strip endian annotation and compare; the 529 * endianness doesn't actually matter since we just need a stable 530 * order for the RB tree. 531 */ 532static int be32_lt(__be32 a, __be32 b) 533{ 534 return (__force u32) a < (__force u32) b; 535} 536 537static int be32_gt(__be32 a, __be32 b) 538{ 539 return (__force u32) a > (__force u32) b; 540} 541 542static int be64_lt(__be64 a, __be64 b) 543{ 544 return (__force u64) a < (__force u64) b; 545} 546 547static int be64_gt(__be64 a, __be64 b) 548{ 549 return (__force u64) a > (__force u64) b; 550} 551 552static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 553{ 554 struct rb_node **link = &cm.listen_service_table.rb_node; 555 struct rb_node *parent = NULL; 556 struct cm_id_private *cur_cm_id_priv; 557 __be64 service_id = cm_id_priv->id.service_id; 558 __be64 service_mask = cm_id_priv->id.service_mask; 559 560 while (*link) { 561 parent = *link; 562 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 563 service_node); 564 if ((cur_cm_id_priv->id.service_mask & service_id) == 565 (service_mask & cur_cm_id_priv->id.service_id) && 566 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 567 return cur_cm_id_priv; 568 569 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 570 link = &(*link)->rb_left; 571 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 572 link = &(*link)->rb_right; 573 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 574 link = &(*link)->rb_left; 575 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 576 link = &(*link)->rb_right; 577 else 578 link = &(*link)->rb_right; 579 } 580 rb_link_node(&cm_id_priv->service_node, parent, link); 581 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 582 return NULL; 583} 584 585static struct cm_id_private * cm_find_listen(struct ib_device *device, 586 __be64 service_id) 587{ 588 struct rb_node *node = cm.listen_service_table.rb_node; 589 struct cm_id_private *cm_id_priv; 590 591 while (node) { 592 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 593 if ((cm_id_priv->id.service_mask & service_id) == 594 cm_id_priv->id.service_id && 595 (cm_id_priv->id.device == device)) 596 return cm_id_priv; 597 598 if (device < cm_id_priv->id.device) 599 node = node->rb_left; 600 else if (device > cm_id_priv->id.device) 601 node = node->rb_right; 602 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 603 node = node->rb_left; 604 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 605 node = node->rb_right; 606 else 607 node = node->rb_right; 608 } 609 return NULL; 610} 611 612static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 613 *timewait_info) 614{ 615 struct rb_node **link = &cm.remote_id_table.rb_node; 616 struct rb_node *parent = NULL; 617 struct cm_timewait_info *cur_timewait_info; 618 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 619 __be32 remote_id = timewait_info->work.remote_id; 620 621 while (*link) { 622 parent = *link; 623 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 624 remote_id_node); 625 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 626 link = &(*link)->rb_left; 627 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 628 link = &(*link)->rb_right; 629 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 630 link = &(*link)->rb_left; 631 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 632 link = &(*link)->rb_right; 633 else 634 return cur_timewait_info; 635 } 636 timewait_info->inserted_remote_id = 1; 637 rb_link_node(&timewait_info->remote_id_node, parent, link); 638 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 639 return NULL; 640} 641 642static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 643 __be32 remote_id) 644{ 645 struct rb_node *node = cm.remote_id_table.rb_node; 646 struct cm_timewait_info *timewait_info; 647 648 while (node) { 649 timewait_info = rb_entry(node, struct cm_timewait_info, 650 remote_id_node); 651 if (be32_lt(remote_id, timewait_info->work.remote_id)) 652 node = node->rb_left; 653 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 654 node = node->rb_right; 655 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 656 node = node->rb_left; 657 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 658 node = node->rb_right; 659 else 660 return timewait_info; 661 } 662 return NULL; 663} 664 665static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 666 *timewait_info) 667{ 668 struct rb_node **link = &cm.remote_qp_table.rb_node; 669 struct rb_node *parent = NULL; 670 struct cm_timewait_info *cur_timewait_info; 671 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 672 __be32 remote_qpn = timewait_info->remote_qpn; 673 674 while (*link) { 675 parent = *link; 676 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 677 remote_qp_node); 678 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 679 link = &(*link)->rb_left; 680 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 681 link = &(*link)->rb_right; 682 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 683 link = &(*link)->rb_left; 684 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 685 link = &(*link)->rb_right; 686 else 687 return cur_timewait_info; 688 } 689 timewait_info->inserted_remote_qp = 1; 690 rb_link_node(&timewait_info->remote_qp_node, parent, link); 691 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 692 return NULL; 693} 694 695static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 696 *cm_id_priv) 697{ 698 struct rb_node **link = &cm.remote_sidr_table.rb_node; 699 struct rb_node *parent = NULL; 700 struct cm_id_private *cur_cm_id_priv; 701 union ib_gid *port_gid = &cm_id_priv->av.dgid; 702 __be32 remote_id = cm_id_priv->id.remote_id; 703 704 while (*link) { 705 parent = *link; 706 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 707 sidr_id_node); 708 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 709 link = &(*link)->rb_left; 710 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 711 link = &(*link)->rb_right; 712 else { 713 int cmp; 714 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 715 sizeof *port_gid); 716 if (cmp < 0) 717 link = &(*link)->rb_left; 718 else if (cmp > 0) 719 link = &(*link)->rb_right; 720 else 721 return cur_cm_id_priv; 722 } 723 } 724 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 725 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 726 return NULL; 727} 728 729static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 730 enum ib_cm_sidr_status status) 731{ 732 struct ib_cm_sidr_rep_param param; 733 734 memset(¶m, 0, sizeof param); 735 param.status = status; 736 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 737} 738 739struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 740 ib_cm_handler cm_handler, 741 void *context) 742{ 743 struct cm_id_private *cm_id_priv; 744 int ret; 745 746 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 747 if (!cm_id_priv) 748 return ERR_PTR(-ENOMEM); 749 750 cm_id_priv->id.state = IB_CM_IDLE; 751 cm_id_priv->id.device = device; 752 cm_id_priv->id.cm_handler = cm_handler; 753 cm_id_priv->id.context = context; 754 cm_id_priv->id.remote_cm_qpn = 1; 755 ret = cm_alloc_id(cm_id_priv); 756 if (ret) 757 goto error; 758 759 spin_lock_init(&cm_id_priv->lock); 760 init_completion(&cm_id_priv->comp); 761 INIT_LIST_HEAD(&cm_id_priv->work_list); 762 INIT_LIST_HEAD(&cm_id_priv->prim_list); 763 INIT_LIST_HEAD(&cm_id_priv->altr_list); 764 atomic_set(&cm_id_priv->work_count, -1); 765 atomic_set(&cm_id_priv->refcount, 1); 766 return &cm_id_priv->id; 767 768error: 769 kfree(cm_id_priv); 770 return ERR_PTR(-ENOMEM); 771} 772EXPORT_SYMBOL(ib_create_cm_id); 773 774static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 775{ 776 struct cm_work *work; 777 778 if (list_empty(&cm_id_priv->work_list)) 779 return NULL; 780 781 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 782 list_del(&work->list); 783 return work; 784} 785 786static void cm_free_work(struct cm_work *work) 787{ 788 if (work->mad_recv_wc) 789 ib_free_recv_mad(work->mad_recv_wc); 790 kfree(work); 791} 792 793static inline int cm_convert_to_ms(int iba_time) 794{ 795 /* approximate conversion to ms from 4.096us x 2^iba_time */ 796 return 1 << max(iba_time - 8, 0); 797} 798 799/* 800 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 801 * Because of how ack_timeout is stored, adding one doubles the timeout. 802 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 803 * increment it (round up) only if the other is within 50%. 804 */ 805static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 806{ 807 int ack_timeout = packet_life_time + 1; 808 809 if (ack_timeout >= ca_ack_delay) 810 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 811 else 812 ack_timeout = ca_ack_delay + 813 (ack_timeout >= (ca_ack_delay - 1)); 814 815 return min(31, ack_timeout); 816} 817 818static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 819{ 820 if (timewait_info->inserted_remote_id) { 821 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 822 timewait_info->inserted_remote_id = 0; 823 } 824 825 if (timewait_info->inserted_remote_qp) { 826 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 827 timewait_info->inserted_remote_qp = 0; 828 } 829} 830 831static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 832{ 833 struct cm_timewait_info *timewait_info; 834 835 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 836 if (!timewait_info) 837 return ERR_PTR(-ENOMEM); 838 839 timewait_info->work.local_id = local_id; 840 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 841 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 842 return timewait_info; 843} 844 845static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 846{ 847 int wait_time; 848 unsigned long flags; 849 struct cm_device *cm_dev; 850 851 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 852 if (!cm_dev) 853 return; 854 855 spin_lock_irqsave(&cm.lock, flags); 856 cm_cleanup_timewait(cm_id_priv->timewait_info); 857 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 858 spin_unlock_irqrestore(&cm.lock, flags); 859 860 /* 861 * The cm_id could be destroyed by the user before we exit timewait. 862 * To protect against this, we search for the cm_id after exiting 863 * timewait before notifying the user that we've exited timewait. 864 */ 865 cm_id_priv->id.state = IB_CM_TIMEWAIT; 866 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 867 868 /* Check if the device started its remove_one */ 869 spin_lock_irqsave(&cm.lock, flags); 870 if (!cm_dev->going_down) 871 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 872 msecs_to_jiffies(wait_time)); 873 spin_unlock_irqrestore(&cm.lock, flags); 874 875 cm_id_priv->timewait_info = NULL; 876} 877 878static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 879{ 880 unsigned long flags; 881 882 cm_id_priv->id.state = IB_CM_IDLE; 883 if (cm_id_priv->timewait_info) { 884 spin_lock_irqsave(&cm.lock, flags); 885 cm_cleanup_timewait(cm_id_priv->timewait_info); 886 spin_unlock_irqrestore(&cm.lock, flags); 887 kfree(cm_id_priv->timewait_info); 888 cm_id_priv->timewait_info = NULL; 889 } 890} 891 892static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 893{ 894 struct cm_id_private *cm_id_priv; 895 struct cm_work *work; 896 897 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 898retest: 899 spin_lock_irq(&cm_id_priv->lock); 900 switch (cm_id->state) { 901 case IB_CM_LISTEN: 902 spin_unlock_irq(&cm_id_priv->lock); 903 904 spin_lock_irq(&cm.lock); 905 if (--cm_id_priv->listen_sharecount > 0) { 906 /* The id is still shared. */ 907 cm_deref_id(cm_id_priv); 908 spin_unlock_irq(&cm.lock); 909 return; 910 } 911 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 912 spin_unlock_irq(&cm.lock); 913 break; 914 case IB_CM_SIDR_REQ_SENT: 915 cm_id->state = IB_CM_IDLE; 916 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 917 spin_unlock_irq(&cm_id_priv->lock); 918 break; 919 case IB_CM_SIDR_REQ_RCVD: 920 spin_unlock_irq(&cm_id_priv->lock); 921 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 922 spin_lock_irq(&cm.lock); 923 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 924 rb_erase(&cm_id_priv->sidr_id_node, 925 &cm.remote_sidr_table); 926 spin_unlock_irq(&cm.lock); 927 break; 928 case IB_CM_REQ_SENT: 929 case IB_CM_MRA_REQ_RCVD: 930 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 931 spin_unlock_irq(&cm_id_priv->lock); 932 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 933 &cm_id_priv->id.device->node_guid, 934 sizeof cm_id_priv->id.device->node_guid, 935 NULL, 0); 936 break; 937 case IB_CM_REQ_RCVD: 938 if (err == -ENOMEM) { 939 /* Do not reject to allow future retries. */ 940 cm_reset_to_idle(cm_id_priv); 941 spin_unlock_irq(&cm_id_priv->lock); 942 } else { 943 spin_unlock_irq(&cm_id_priv->lock); 944 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 945 NULL, 0, NULL, 0); 946 } 947 break; 948 case IB_CM_REP_SENT: 949 case IB_CM_MRA_REP_RCVD: 950 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 951 /* Fall through */ 952 case IB_CM_MRA_REQ_SENT: 953 case IB_CM_REP_RCVD: 954 case IB_CM_MRA_REP_SENT: 955 spin_unlock_irq(&cm_id_priv->lock); 956 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 957 NULL, 0, NULL, 0); 958 break; 959 case IB_CM_ESTABLISHED: 960 spin_unlock_irq(&cm_id_priv->lock); 961 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 962 break; 963 ib_send_cm_dreq(cm_id, NULL, 0); 964 goto retest; 965 case IB_CM_DREQ_SENT: 966 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 967 cm_enter_timewait(cm_id_priv); 968 spin_unlock_irq(&cm_id_priv->lock); 969 break; 970 case IB_CM_DREQ_RCVD: 971 spin_unlock_irq(&cm_id_priv->lock); 972 ib_send_cm_drep(cm_id, NULL, 0); 973 break; 974 default: 975 spin_unlock_irq(&cm_id_priv->lock); 976 break; 977 } 978 979 spin_lock_irq(&cm.lock); 980 if (!list_empty(&cm_id_priv->altr_list) && 981 (!cm_id_priv->altr_send_port_not_ready)) 982 list_del(&cm_id_priv->altr_list); 983 if (!list_empty(&cm_id_priv->prim_list) && 984 (!cm_id_priv->prim_send_port_not_ready)) 985 list_del(&cm_id_priv->prim_list); 986 spin_unlock_irq(&cm.lock); 987 988 cm_free_id(cm_id->local_id); 989 cm_deref_id(cm_id_priv); 990 wait_for_completion(&cm_id_priv->comp); 991 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 992 cm_free_work(work); 993 kfree(cm_id_priv->private_data); 994 kfree(cm_id_priv); 995} 996 997void ib_destroy_cm_id(struct ib_cm_id *cm_id) 998{ 999 cm_destroy_id(cm_id, 0); 1000} 1001EXPORT_SYMBOL(ib_destroy_cm_id); 1002 1003/** 1004 * __ib_cm_listen - Initiates listening on the specified service ID for 1005 * connection and service ID resolution requests. 1006 * @cm_id: Connection identifier associated with the listen request. 1007 * @service_id: Service identifier matched against incoming connection 1008 * and service ID resolution requests. The service ID should be specified 1009 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1010 * assign a service ID to the caller. 1011 * @service_mask: Mask applied to service ID used to listen across a 1012 * range of service IDs. If set to 0, the service ID is matched 1013 * exactly. This parameter is ignored if %service_id is set to 1014 * IB_CM_ASSIGN_SERVICE_ID. 1015 */ 1016static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 1017 __be64 service_mask) 1018{ 1019 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 1020 int ret = 0; 1021 1022 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1023 service_id &= service_mask; 1024 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1025 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1026 return -EINVAL; 1027 1028 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1029 if (cm_id->state != IB_CM_IDLE) 1030 return -EINVAL; 1031 1032 cm_id->state = IB_CM_LISTEN; 1033 ++cm_id_priv->listen_sharecount; 1034 1035 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1036 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1037 cm_id->service_mask = ~cpu_to_be64(0); 1038 } else { 1039 cm_id->service_id = service_id; 1040 cm_id->service_mask = service_mask; 1041 } 1042 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1043 1044 if (cur_cm_id_priv) { 1045 cm_id->state = IB_CM_IDLE; 1046 --cm_id_priv->listen_sharecount; 1047 ret = -EBUSY; 1048 } 1049 return ret; 1050} 1051 1052int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1053{ 1054 unsigned long flags; 1055 int ret; 1056 1057 spin_lock_irqsave(&cm.lock, flags); 1058 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1059 spin_unlock_irqrestore(&cm.lock, flags); 1060 1061 return ret; 1062} 1063EXPORT_SYMBOL(ib_cm_listen); 1064 1065/** 1066 * Create a new listening ib_cm_id and listen on the given service ID. 1067 * 1068 * If there's an existing ID listening on that same device and service ID, 1069 * return it. 1070 * 1071 * @device: Device associated with the cm_id. All related communication will 1072 * be associated with the specified device. 1073 * @cm_handler: Callback invoked to notify the user of CM events. 1074 * @service_id: Service identifier matched against incoming connection 1075 * and service ID resolution requests. The service ID should be specified 1076 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1077 * assign a service ID to the caller. 1078 * 1079 * Callers should call ib_destroy_cm_id when done with the listener ID. 1080 */ 1081struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1082 ib_cm_handler cm_handler, 1083 __be64 service_id) 1084{ 1085 struct cm_id_private *cm_id_priv; 1086 struct ib_cm_id *cm_id; 1087 unsigned long flags; 1088 int err = 0; 1089 1090 /* Create an ID in advance, since the creation may sleep */ 1091 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1092 if (IS_ERR(cm_id)) 1093 return cm_id; 1094 1095 spin_lock_irqsave(&cm.lock, flags); 1096 1097 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1098 goto new_id; 1099 1100 /* Find an existing ID */ 1101 cm_id_priv = cm_find_listen(device, service_id); 1102 if (cm_id_priv) { 1103 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1104 /* Sharing an ib_cm_id with different handlers is not 1105 * supported */ 1106 spin_unlock_irqrestore(&cm.lock, flags); 1107 return ERR_PTR(-EINVAL); 1108 } 1109 atomic_inc(&cm_id_priv->refcount); 1110 ++cm_id_priv->listen_sharecount; 1111 spin_unlock_irqrestore(&cm.lock, flags); 1112 1113 ib_destroy_cm_id(cm_id); 1114 cm_id = &cm_id_priv->id; 1115 return cm_id; 1116 } 1117 1118new_id: 1119 /* Use newly created ID */ 1120 err = __ib_cm_listen(cm_id, service_id, 0); 1121 1122 spin_unlock_irqrestore(&cm.lock, flags); 1123 1124 if (err) { 1125 ib_destroy_cm_id(cm_id); 1126 return ERR_PTR(err); 1127 } 1128 return cm_id; 1129} 1130EXPORT_SYMBOL(ib_cm_insert_listen); 1131 1132static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1133 enum cm_msg_sequence msg_seq) 1134{ 1135 u64 hi_tid, low_tid; 1136 1137 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1138 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1139 (msg_seq << 30)); 1140 return cpu_to_be64(hi_tid | low_tid); 1141} 1142 1143static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1144 __be16 attr_id, __be64 tid) 1145{ 1146 hdr->base_version = IB_MGMT_BASE_VERSION; 1147 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1148 hdr->class_version = IB_CM_CLASS_VERSION; 1149 hdr->method = IB_MGMT_METHOD_SEND; 1150 hdr->attr_id = attr_id; 1151 hdr->tid = tid; 1152} 1153 1154static void cm_format_req(struct cm_req_msg *req_msg, 1155 struct cm_id_private *cm_id_priv, 1156 struct ib_cm_req_param *param) 1157{ 1158 struct ib_sa_path_rec *pri_path = param->primary_path; 1159 struct ib_sa_path_rec *alt_path = param->alternate_path; 1160 1161 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1162 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1163 1164 req_msg->local_comm_id = cm_id_priv->id.local_id; 1165 req_msg->service_id = param->service_id; 1166 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1167 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1168 cm_req_set_init_depth(req_msg, param->initiator_depth); 1169 cm_req_set_remote_resp_timeout(req_msg, 1170 param->remote_cm_response_timeout); 1171 cm_req_set_qp_type(req_msg, param->qp_type); 1172 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1173 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1174 cm_req_set_local_resp_timeout(req_msg, 1175 param->local_cm_response_timeout); 1176 req_msg->pkey = param->primary_path->pkey; 1177 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1178 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1179 1180 if (param->qp_type != IB_QPT_XRC_INI) { 1181 cm_req_set_resp_res(req_msg, param->responder_resources); 1182 cm_req_set_retry_count(req_msg, param->retry_count); 1183 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1184 cm_req_set_srq(req_msg, param->srq); 1185 } 1186 1187 if (pri_path->hop_limit <= 1) { 1188 req_msg->primary_local_lid = pri_path->slid; 1189 req_msg->primary_remote_lid = pri_path->dlid; 1190 } else { 1191 /* Work-around until there's a way to obtain remote LID info */ 1192 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1193 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1194 } 1195 req_msg->primary_local_gid = pri_path->sgid; 1196 req_msg->primary_remote_gid = pri_path->dgid; 1197 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1198 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1199 req_msg->primary_traffic_class = pri_path->traffic_class; 1200 req_msg->primary_hop_limit = pri_path->hop_limit; 1201 cm_req_set_primary_sl(req_msg, pri_path->sl); 1202 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1203 cm_req_set_primary_local_ack_timeout(req_msg, 1204 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1205 pri_path->packet_life_time)); 1206 1207 if (alt_path) { 1208 if (alt_path->hop_limit <= 1) { 1209 req_msg->alt_local_lid = alt_path->slid; 1210 req_msg->alt_remote_lid = alt_path->dlid; 1211 } else { 1212 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1213 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1214 } 1215 req_msg->alt_local_gid = alt_path->sgid; 1216 req_msg->alt_remote_gid = alt_path->dgid; 1217 cm_req_set_alt_flow_label(req_msg, 1218 alt_path->flow_label); 1219 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1220 req_msg->alt_traffic_class = alt_path->traffic_class; 1221 req_msg->alt_hop_limit = alt_path->hop_limit; 1222 cm_req_set_alt_sl(req_msg, alt_path->sl); 1223 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1224 cm_req_set_alt_local_ack_timeout(req_msg, 1225 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1226 alt_path->packet_life_time)); 1227 } 1228 1229 if (param->private_data && param->private_data_len) 1230 memcpy(req_msg->private_data, param->private_data, 1231 param->private_data_len); 1232} 1233 1234static int cm_validate_req_param(struct ib_cm_req_param *param) 1235{ 1236 /* peer-to-peer not supported */ 1237 if (param->peer_to_peer) 1238 return -EINVAL; 1239 1240 if (!param->primary_path) 1241 return -EINVAL; 1242 1243 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1244 param->qp_type != IB_QPT_XRC_INI) 1245 return -EINVAL; 1246 1247 if (param->private_data && 1248 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1249 return -EINVAL; 1250 1251 if (param->alternate_path && 1252 (param->alternate_path->pkey != param->primary_path->pkey || 1253 param->alternate_path->mtu != param->primary_path->mtu)) 1254 return -EINVAL; 1255 1256 return 0; 1257} 1258 1259int ib_send_cm_req(struct ib_cm_id *cm_id, 1260 struct ib_cm_req_param *param) 1261{ 1262 struct cm_id_private *cm_id_priv; 1263 struct cm_req_msg *req_msg; 1264 unsigned long flags; 1265 int ret; 1266 1267 ret = cm_validate_req_param(param); 1268 if (ret) 1269 return ret; 1270 1271 /* Verify that we're not in timewait. */ 1272 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1273 spin_lock_irqsave(&cm_id_priv->lock, flags); 1274 if (cm_id->state != IB_CM_IDLE) { 1275 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1276 ret = -EINVAL; 1277 goto out; 1278 } 1279 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1280 1281 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1282 id.local_id); 1283 if (IS_ERR(cm_id_priv->timewait_info)) { 1284 ret = PTR_ERR(cm_id_priv->timewait_info); 1285 goto out; 1286 } 1287 1288 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av, 1289 cm_id_priv); 1290 if (ret) 1291 goto error1; 1292 if (param->alternate_path) { 1293 ret = cm_init_av_by_path(param->alternate_path, 1294 &cm_id_priv->alt_av, cm_id_priv); 1295 if (ret) 1296 goto error1; 1297 } 1298 cm_id->service_id = param->service_id; 1299 cm_id->service_mask = ~cpu_to_be64(0); 1300 cm_id_priv->timeout_ms = cm_convert_to_ms( 1301 param->primary_path->packet_life_time) * 2 + 1302 cm_convert_to_ms( 1303 param->remote_cm_response_timeout); 1304 cm_id_priv->max_cm_retries = param->max_cm_retries; 1305 cm_id_priv->initiator_depth = param->initiator_depth; 1306 cm_id_priv->responder_resources = param->responder_resources; 1307 cm_id_priv->retry_count = param->retry_count; 1308 cm_id_priv->path_mtu = param->primary_path->mtu; 1309 cm_id_priv->pkey = param->primary_path->pkey; 1310 cm_id_priv->qp_type = param->qp_type; 1311 1312 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1313 if (ret) 1314 goto error1; 1315 1316 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1317 cm_format_req(req_msg, cm_id_priv, param); 1318 cm_id_priv->tid = req_msg->hdr.tid; 1319 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1320 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1321 1322 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1323 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1324 1325 spin_lock_irqsave(&cm_id_priv->lock, flags); 1326 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1327 if (ret) { 1328 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1329 goto error2; 1330 } 1331 BUG_ON(cm_id->state != IB_CM_IDLE); 1332 cm_id->state = IB_CM_REQ_SENT; 1333 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1334 return 0; 1335 1336error2: cm_free_msg(cm_id_priv->msg); 1337error1: kfree(cm_id_priv->timewait_info); 1338out: return ret; 1339} 1340EXPORT_SYMBOL(ib_send_cm_req); 1341 1342static int cm_issue_rej(struct cm_port *port, 1343 struct ib_mad_recv_wc *mad_recv_wc, 1344 enum ib_cm_rej_reason reason, 1345 enum cm_msg_response msg_rejected, 1346 void *ari, u8 ari_length) 1347{ 1348 struct ib_mad_send_buf *msg = NULL; 1349 struct cm_rej_msg *rej_msg, *rcv_msg; 1350 int ret; 1351 1352 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1353 if (ret) 1354 return ret; 1355 1356 /* We just need common CM header information. Cast to any message. */ 1357 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1358 rej_msg = (struct cm_rej_msg *) msg->mad; 1359 1360 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1361 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1362 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1363 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1364 rej_msg->reason = cpu_to_be16(reason); 1365 1366 if (ari && ari_length) { 1367 cm_rej_set_reject_info_len(rej_msg, ari_length); 1368 memcpy(rej_msg->ari, ari, ari_length); 1369 } 1370 1371 ret = ib_post_send_mad(msg, NULL); 1372 if (ret) 1373 cm_free_msg(msg); 1374 1375 return ret; 1376} 1377 1378static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1379 struct ib_sa_path_rec *primary_path, 1380 struct ib_sa_path_rec *alt_path) 1381{ 1382 memset(primary_path, 0, sizeof *primary_path); 1383 primary_path->dgid = req_msg->primary_local_gid; 1384 primary_path->sgid = req_msg->primary_remote_gid; 1385 primary_path->dlid = req_msg->primary_local_lid; 1386 primary_path->slid = req_msg->primary_remote_lid; 1387 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1388 primary_path->hop_limit = req_msg->primary_hop_limit; 1389 primary_path->traffic_class = req_msg->primary_traffic_class; 1390 primary_path->reversible = 1; 1391 primary_path->pkey = req_msg->pkey; 1392 primary_path->sl = cm_req_get_primary_sl(req_msg); 1393 primary_path->mtu_selector = IB_SA_EQ; 1394 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1395 primary_path->rate_selector = IB_SA_EQ; 1396 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1397 primary_path->packet_life_time_selector = IB_SA_EQ; 1398 primary_path->packet_life_time = 1399 cm_req_get_primary_local_ack_timeout(req_msg); 1400 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1401 primary_path->service_id = req_msg->service_id; 1402 1403 if (req_msg->alt_local_lid) { 1404 memset(alt_path, 0, sizeof *alt_path); 1405 alt_path->dgid = req_msg->alt_local_gid; 1406 alt_path->sgid = req_msg->alt_remote_gid; 1407 alt_path->dlid = req_msg->alt_local_lid; 1408 alt_path->slid = req_msg->alt_remote_lid; 1409 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1410 alt_path->hop_limit = req_msg->alt_hop_limit; 1411 alt_path->traffic_class = req_msg->alt_traffic_class; 1412 alt_path->reversible = 1; 1413 alt_path->pkey = req_msg->pkey; 1414 alt_path->sl = cm_req_get_alt_sl(req_msg); 1415 alt_path->mtu_selector = IB_SA_EQ; 1416 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1417 alt_path->rate_selector = IB_SA_EQ; 1418 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1419 alt_path->packet_life_time_selector = IB_SA_EQ; 1420 alt_path->packet_life_time = 1421 cm_req_get_alt_local_ack_timeout(req_msg); 1422 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1423 alt_path->service_id = req_msg->service_id; 1424 } 1425} 1426 1427static u16 cm_get_bth_pkey(struct cm_work *work) 1428{ 1429 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1430 u8 port_num = work->port->port_num; 1431 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1432 u16 pkey; 1433 int ret; 1434 1435 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1436 if (ret) { 1437 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1438 port_num, pkey_index, ret); 1439 return 0; 1440 } 1441 1442 return pkey; 1443} 1444 1445static void cm_format_req_event(struct cm_work *work, 1446 struct cm_id_private *cm_id_priv, 1447 struct ib_cm_id *listen_id) 1448{ 1449 struct cm_req_msg *req_msg; 1450 struct ib_cm_req_event_param *param; 1451 1452 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1453 param = &work->cm_event.param.req_rcvd; 1454 param->listen_id = listen_id; 1455 param->bth_pkey = cm_get_bth_pkey(work); 1456 param->port = cm_id_priv->av.port->port_num; 1457 param->primary_path = &work->path[0]; 1458 if (req_msg->alt_local_lid) 1459 param->alternate_path = &work->path[1]; 1460 else 1461 param->alternate_path = NULL; 1462 param->remote_ca_guid = req_msg->local_ca_guid; 1463 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1464 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1465 param->qp_type = cm_req_get_qp_type(req_msg); 1466 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1467 param->responder_resources = cm_req_get_init_depth(req_msg); 1468 param->initiator_depth = cm_req_get_resp_res(req_msg); 1469 param->local_cm_response_timeout = 1470 cm_req_get_remote_resp_timeout(req_msg); 1471 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1472 param->remote_cm_response_timeout = 1473 cm_req_get_local_resp_timeout(req_msg); 1474 param->retry_count = cm_req_get_retry_count(req_msg); 1475 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1476 param->srq = cm_req_get_srq(req_msg); 1477 param->ppath_sgid_index = cm_id_priv->av.ah_attr.grh.sgid_index; 1478 work->cm_event.private_data = &req_msg->private_data; 1479} 1480 1481static void cm_process_work(struct cm_id_private *cm_id_priv, 1482 struct cm_work *work) 1483{ 1484 int ret; 1485 1486 /* We will typically only have the current event to report. */ 1487 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1488 cm_free_work(work); 1489 1490 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1491 spin_lock_irq(&cm_id_priv->lock); 1492 work = cm_dequeue_work(cm_id_priv); 1493 spin_unlock_irq(&cm_id_priv->lock); 1494 BUG_ON(!work); 1495 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1496 &work->cm_event); 1497 cm_free_work(work); 1498 } 1499 cm_deref_id(cm_id_priv); 1500 if (ret) 1501 cm_destroy_id(&cm_id_priv->id, ret); 1502} 1503 1504static void cm_format_mra(struct cm_mra_msg *mra_msg, 1505 struct cm_id_private *cm_id_priv, 1506 enum cm_msg_response msg_mraed, u8 service_timeout, 1507 const void *private_data, u8 private_data_len) 1508{ 1509 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1510 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1511 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1512 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1513 cm_mra_set_service_timeout(mra_msg, service_timeout); 1514 1515 if (private_data && private_data_len) 1516 memcpy(mra_msg->private_data, private_data, private_data_len); 1517} 1518 1519static void cm_format_rej(struct cm_rej_msg *rej_msg, 1520 struct cm_id_private *cm_id_priv, 1521 enum ib_cm_rej_reason reason, 1522 void *ari, 1523 u8 ari_length, 1524 const void *private_data, 1525 u8 private_data_len) 1526{ 1527 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1528 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1529 1530 switch(cm_id_priv->id.state) { 1531 case IB_CM_REQ_RCVD: 1532 rej_msg->local_comm_id = 0; 1533 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1534 break; 1535 case IB_CM_MRA_REQ_SENT: 1536 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1537 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1538 break; 1539 case IB_CM_REP_RCVD: 1540 case IB_CM_MRA_REP_SENT: 1541 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1542 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1543 break; 1544 default: 1545 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1546 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1547 break; 1548 } 1549 1550 rej_msg->reason = cpu_to_be16(reason); 1551 if (ari && ari_length) { 1552 cm_rej_set_reject_info_len(rej_msg, ari_length); 1553 memcpy(rej_msg->ari, ari, ari_length); 1554 } 1555 1556 if (private_data && private_data_len) 1557 memcpy(rej_msg->private_data, private_data, private_data_len); 1558} 1559 1560static void cm_dup_req_handler(struct cm_work *work, 1561 struct cm_id_private *cm_id_priv) 1562{ 1563 struct ib_mad_send_buf *msg = NULL; 1564 int ret; 1565 1566 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1567 counter[CM_REQ_COUNTER]); 1568 1569 /* Quick state check to discard duplicate REQs. */ 1570 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1571 return; 1572 1573 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1574 if (ret) 1575 return; 1576 1577 spin_lock_irq(&cm_id_priv->lock); 1578 switch (cm_id_priv->id.state) { 1579 case IB_CM_MRA_REQ_SENT: 1580 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1581 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1582 cm_id_priv->private_data, 1583 cm_id_priv->private_data_len); 1584 break; 1585 case IB_CM_TIMEWAIT: 1586 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1587 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1588 break; 1589 default: 1590 goto unlock; 1591 } 1592 spin_unlock_irq(&cm_id_priv->lock); 1593 1594 ret = ib_post_send_mad(msg, NULL); 1595 if (ret) 1596 goto free; 1597 return; 1598 1599unlock: spin_unlock_irq(&cm_id_priv->lock); 1600free: cm_free_msg(msg); 1601} 1602 1603static struct cm_id_private * cm_match_req(struct cm_work *work, 1604 struct cm_id_private *cm_id_priv) 1605{ 1606 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1607 struct cm_timewait_info *timewait_info; 1608 struct cm_req_msg *req_msg; 1609 1610 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1611 1612 /* Check for possible duplicate REQ. */ 1613 spin_lock_irq(&cm.lock); 1614 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1615 if (timewait_info) { 1616 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1617 timewait_info->work.remote_id); 1618 spin_unlock_irq(&cm.lock); 1619 if (cur_cm_id_priv) { 1620 cm_dup_req_handler(work, cur_cm_id_priv); 1621 cm_deref_id(cur_cm_id_priv); 1622 } 1623 return NULL; 1624 } 1625 1626 /* Check for stale connections. */ 1627 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1628 if (timewait_info) { 1629 cm_cleanup_timewait(cm_id_priv->timewait_info); 1630 spin_unlock_irq(&cm.lock); 1631 cm_issue_rej(work->port, work->mad_recv_wc, 1632 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1633 NULL, 0); 1634 return NULL; 1635 } 1636 1637 /* Find matching listen request. */ 1638 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1639 req_msg->service_id); 1640 if (!listen_cm_id_priv) { 1641 cm_cleanup_timewait(cm_id_priv->timewait_info); 1642 spin_unlock_irq(&cm.lock); 1643 cm_issue_rej(work->port, work->mad_recv_wc, 1644 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1645 NULL, 0); 1646 goto out; 1647 } 1648 atomic_inc(&listen_cm_id_priv->refcount); 1649 atomic_inc(&cm_id_priv->refcount); 1650 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1651 atomic_inc(&cm_id_priv->work_count); 1652 spin_unlock_irq(&cm.lock); 1653out: 1654 return listen_cm_id_priv; 1655} 1656 1657/* 1658 * Work-around for inter-subnet connections. If the LIDs are permissive, 1659 * we need to override the LID/SL data in the REQ with the LID information 1660 * in the work completion. 1661 */ 1662static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1663{ 1664 if (!cm_req_get_primary_subnet_local(req_msg)) { 1665 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1666 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1667 cm_req_set_primary_sl(req_msg, wc->sl); 1668 } 1669 1670 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1671 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1672 } 1673 1674 if (!cm_req_get_alt_subnet_local(req_msg)) { 1675 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1676 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1677 cm_req_set_alt_sl(req_msg, wc->sl); 1678 } 1679 1680 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1681 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1682 } 1683} 1684 1685static int cm_req_handler(struct cm_work *work) 1686{ 1687 struct ib_cm_id *cm_id; 1688 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1689 struct cm_req_msg *req_msg; 1690 union ib_gid gid; 1691 struct ib_gid_attr gid_attr; 1692 int ret; 1693 1694 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1695 1696 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1697 if (IS_ERR(cm_id)) 1698 return PTR_ERR(cm_id); 1699 1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1701 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1702 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1703 work->mad_recv_wc->recv_buf.grh, 1704 &cm_id_priv->av); 1705 if (ret) 1706 goto destroy; 1707 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1708 id.local_id); 1709 if (IS_ERR(cm_id_priv->timewait_info)) { 1710 ret = PTR_ERR(cm_id_priv->timewait_info); 1711 goto destroy; 1712 } 1713 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1714 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1715 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1716 1717 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1718 if (!listen_cm_id_priv) { 1719 ret = -EINVAL; 1720 kfree(cm_id_priv->timewait_info); 1721 goto destroy; 1722 } 1723 1724 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1725 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1726 cm_id_priv->id.service_id = req_msg->service_id; 1727 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1728 1729 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1730 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1731 1732 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1733 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit; 1734 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1735 work->port->port_num, 1736 cm_id_priv->av.ah_attr.grh.sgid_index, 1737 &gid, &gid_attr); 1738 if (!ret) { 1739 if (gid_attr.ndev) { 1740 work->path[0].ifindex = gid_attr.ndev->if_index; 1741 work->path[0].net = dev_net(gid_attr.ndev); 1742 dev_put(gid_attr.ndev); 1743 } 1744 work->path[0].gid_type = gid_attr.gid_type; 1745 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av, 1746 cm_id_priv); 1747 } 1748 if (ret) { 1749 int err = ib_get_cached_gid(work->port->cm_dev->ib_device, 1750 work->port->port_num, 0, 1751 &work->path[0].sgid, 1752 &gid_attr); 1753 if (!err && gid_attr.ndev) { 1754 work->path[0].ifindex = gid_attr.ndev->if_index; 1755 work->path[0].net = dev_net(gid_attr.ndev); 1756 dev_put(gid_attr.ndev); 1757 } 1758 work->path[0].gid_type = gid_attr.gid_type; 1759 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1760 &work->path[0].sgid, sizeof work->path[0].sgid, 1761 NULL, 0); 1762 goto rejected; 1763 } 1764 if (req_msg->alt_local_lid) { 1765 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av, 1766 cm_id_priv); 1767 if (ret) { 1768 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1769 &work->path[0].sgid, 1770 sizeof work->path[0].sgid, NULL, 0); 1771 goto rejected; 1772 } 1773 } 1774 cm_id_priv->tid = req_msg->hdr.tid; 1775 cm_id_priv->timeout_ms = cm_convert_to_ms( 1776 cm_req_get_local_resp_timeout(req_msg)); 1777 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1778 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1779 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1780 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1781 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1782 cm_id_priv->pkey = req_msg->pkey; 1783 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1784 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1785 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1786 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1787 1788 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1789 cm_process_work(cm_id_priv, work); 1790 cm_deref_id(listen_cm_id_priv); 1791 return 0; 1792 1793rejected: 1794 atomic_dec(&cm_id_priv->refcount); 1795 cm_deref_id(listen_cm_id_priv); 1796destroy: 1797 ib_destroy_cm_id(cm_id); 1798 return ret; 1799} 1800 1801static void cm_format_rep(struct cm_rep_msg *rep_msg, 1802 struct cm_id_private *cm_id_priv, 1803 struct ib_cm_rep_param *param) 1804{ 1805 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1806 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1807 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1808 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1809 rep_msg->resp_resources = param->responder_resources; 1810 cm_rep_set_target_ack_delay(rep_msg, 1811 cm_id_priv->av.port->cm_dev->ack_delay); 1812 cm_rep_set_failover(rep_msg, param->failover_accepted); 1813 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1814 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1815 1816 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1817 rep_msg->initiator_depth = param->initiator_depth; 1818 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1819 cm_rep_set_srq(rep_msg, param->srq); 1820 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1821 } else { 1822 cm_rep_set_srq(rep_msg, 1); 1823 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1824 } 1825 1826 if (param->private_data && param->private_data_len) 1827 memcpy(rep_msg->private_data, param->private_data, 1828 param->private_data_len); 1829} 1830 1831int ib_send_cm_rep(struct ib_cm_id *cm_id, 1832 struct ib_cm_rep_param *param) 1833{ 1834 struct cm_id_private *cm_id_priv; 1835 struct ib_mad_send_buf *msg; 1836 struct cm_rep_msg *rep_msg; 1837 unsigned long flags; 1838 int ret; 1839 1840 if (param->private_data && 1841 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1842 return -EINVAL; 1843 1844 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1845 spin_lock_irqsave(&cm_id_priv->lock, flags); 1846 if (cm_id->state != IB_CM_REQ_RCVD && 1847 cm_id->state != IB_CM_MRA_REQ_SENT) { 1848 ret = -EINVAL; 1849 goto out; 1850 } 1851 1852 ret = cm_alloc_msg(cm_id_priv, &msg); 1853 if (ret) 1854 goto out; 1855 1856 rep_msg = (struct cm_rep_msg *) msg->mad; 1857 cm_format_rep(rep_msg, cm_id_priv, param); 1858 msg->timeout_ms = cm_id_priv->timeout_ms; 1859 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1860 1861 ret = ib_post_send_mad(msg, NULL); 1862 if (ret) { 1863 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1864 cm_free_msg(msg); 1865 return ret; 1866 } 1867 1868 cm_id->state = IB_CM_REP_SENT; 1869 cm_id_priv->msg = msg; 1870 cm_id_priv->initiator_depth = param->initiator_depth; 1871 cm_id_priv->responder_resources = param->responder_resources; 1872 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1873 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1874 1875out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1876 return ret; 1877} 1878EXPORT_SYMBOL(ib_send_cm_rep); 1879 1880static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1881 struct cm_id_private *cm_id_priv, 1882 const void *private_data, 1883 u8 private_data_len) 1884{ 1885 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1886 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1887 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1888 1889 if (private_data && private_data_len) 1890 memcpy(rtu_msg->private_data, private_data, private_data_len); 1891} 1892 1893int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1894 const void *private_data, 1895 u8 private_data_len) 1896{ 1897 struct cm_id_private *cm_id_priv; 1898 struct ib_mad_send_buf *msg; 1899 unsigned long flags; 1900 void *data; 1901 int ret; 1902 1903 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1904 return -EINVAL; 1905 1906 data = cm_copy_private_data(private_data, private_data_len); 1907 if (IS_ERR(data)) 1908 return PTR_ERR(data); 1909 1910 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1911 spin_lock_irqsave(&cm_id_priv->lock, flags); 1912 if (cm_id->state != IB_CM_REP_RCVD && 1913 cm_id->state != IB_CM_MRA_REP_SENT) { 1914 ret = -EINVAL; 1915 goto error; 1916 } 1917 1918 ret = cm_alloc_msg(cm_id_priv, &msg); 1919 if (ret) 1920 goto error; 1921 1922 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1923 private_data, private_data_len); 1924 1925 ret = ib_post_send_mad(msg, NULL); 1926 if (ret) { 1927 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1928 cm_free_msg(msg); 1929 kfree(data); 1930 return ret; 1931 } 1932 1933 cm_id->state = IB_CM_ESTABLISHED; 1934 cm_set_private_data(cm_id_priv, data, private_data_len); 1935 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1936 return 0; 1937 1938error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1939 kfree(data); 1940 return ret; 1941} 1942EXPORT_SYMBOL(ib_send_cm_rtu); 1943 1944static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1945{ 1946 struct cm_rep_msg *rep_msg; 1947 struct ib_cm_rep_event_param *param; 1948 1949 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1950 param = &work->cm_event.param.rep_rcvd; 1951 param->remote_ca_guid = rep_msg->local_ca_guid; 1952 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1953 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1954 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1955 param->responder_resources = rep_msg->initiator_depth; 1956 param->initiator_depth = rep_msg->resp_resources; 1957 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1958 param->failover_accepted = cm_rep_get_failover(rep_msg); 1959 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1960 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1961 param->srq = cm_rep_get_srq(rep_msg); 1962 work->cm_event.private_data = &rep_msg->private_data; 1963} 1964 1965static void cm_dup_rep_handler(struct cm_work *work) 1966{ 1967 struct cm_id_private *cm_id_priv; 1968 struct cm_rep_msg *rep_msg; 1969 struct ib_mad_send_buf *msg = NULL; 1970 int ret; 1971 1972 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1973 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1974 rep_msg->local_comm_id); 1975 if (!cm_id_priv) 1976 return; 1977 1978 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1979 counter[CM_REP_COUNTER]); 1980 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1981 if (ret) 1982 goto deref; 1983 1984 spin_lock_irq(&cm_id_priv->lock); 1985 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1986 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1987 cm_id_priv->private_data, 1988 cm_id_priv->private_data_len); 1989 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1990 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1991 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1992 cm_id_priv->private_data, 1993 cm_id_priv->private_data_len); 1994 else 1995 goto unlock; 1996 spin_unlock_irq(&cm_id_priv->lock); 1997 1998 ret = ib_post_send_mad(msg, NULL); 1999 if (ret) 2000 goto free; 2001 goto deref; 2002 2003unlock: spin_unlock_irq(&cm_id_priv->lock); 2004free: cm_free_msg(msg); 2005deref: cm_deref_id(cm_id_priv); 2006} 2007 2008static int cm_rep_handler(struct cm_work *work) 2009{ 2010 struct cm_id_private *cm_id_priv; 2011 struct cm_rep_msg *rep_msg; 2012 int ret; 2013 2014 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 2015 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 2016 if (!cm_id_priv) { 2017 cm_dup_rep_handler(work); 2018 return -EINVAL; 2019 } 2020 2021 cm_format_rep_event(work, cm_id_priv->qp_type); 2022 2023 spin_lock_irq(&cm_id_priv->lock); 2024 switch (cm_id_priv->id.state) { 2025 case IB_CM_REQ_SENT: 2026 case IB_CM_MRA_REQ_RCVD: 2027 break; 2028 default: 2029 spin_unlock_irq(&cm_id_priv->lock); 2030 ret = -EINVAL; 2031 goto error; 2032 } 2033 2034 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2035 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2036 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2037 2038 spin_lock(&cm.lock); 2039 /* Check for duplicate REP. */ 2040 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2041 spin_unlock(&cm.lock); 2042 spin_unlock_irq(&cm_id_priv->lock); 2043 ret = -EINVAL; 2044 goto error; 2045 } 2046 /* Check for a stale connection. */ 2047 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 2048 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2049 &cm.remote_id_table); 2050 cm_id_priv->timewait_info->inserted_remote_id = 0; 2051 spin_unlock(&cm.lock); 2052 spin_unlock_irq(&cm_id_priv->lock); 2053 cm_issue_rej(work->port, work->mad_recv_wc, 2054 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2055 NULL, 0); 2056 ret = -EINVAL; 2057 goto error; 2058 } 2059 spin_unlock(&cm.lock); 2060 2061 cm_id_priv->id.state = IB_CM_REP_RCVD; 2062 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2063 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2064 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2065 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2066 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2067 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2068 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2069 cm_id_priv->av.timeout = 2070 cm_ack_timeout(cm_id_priv->target_ack_delay, 2071 cm_id_priv->av.timeout - 1); 2072 cm_id_priv->alt_av.timeout = 2073 cm_ack_timeout(cm_id_priv->target_ack_delay, 2074 cm_id_priv->alt_av.timeout - 1); 2075 2076 /* todo: handle peer_to_peer */ 2077 2078 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2079 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2080 if (!ret) 2081 list_add_tail(&work->list, &cm_id_priv->work_list); 2082 spin_unlock_irq(&cm_id_priv->lock); 2083 2084 if (ret) 2085 cm_process_work(cm_id_priv, work); 2086 else 2087 cm_deref_id(cm_id_priv); 2088 return 0; 2089 2090error: 2091 cm_deref_id(cm_id_priv); 2092 return ret; 2093} 2094 2095static int cm_establish_handler(struct cm_work *work) 2096{ 2097 struct cm_id_private *cm_id_priv; 2098 int ret; 2099 2100 /* See comment in cm_establish about lookup. */ 2101 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2102 if (!cm_id_priv) 2103 return -EINVAL; 2104 2105 spin_lock_irq(&cm_id_priv->lock); 2106 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2107 spin_unlock_irq(&cm_id_priv->lock); 2108 goto out; 2109 } 2110 2111 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2112 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2113 if (!ret) 2114 list_add_tail(&work->list, &cm_id_priv->work_list); 2115 spin_unlock_irq(&cm_id_priv->lock); 2116 2117 if (ret) 2118 cm_process_work(cm_id_priv, work); 2119 else 2120 cm_deref_id(cm_id_priv); 2121 return 0; 2122out: 2123 cm_deref_id(cm_id_priv); 2124 return -EINVAL; 2125} 2126 2127static int cm_rtu_handler(struct cm_work *work) 2128{ 2129 struct cm_id_private *cm_id_priv; 2130 struct cm_rtu_msg *rtu_msg; 2131 int ret; 2132 2133 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2134 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2135 rtu_msg->local_comm_id); 2136 if (!cm_id_priv) 2137 return -EINVAL; 2138 2139 work->cm_event.private_data = &rtu_msg->private_data; 2140 2141 spin_lock_irq(&cm_id_priv->lock); 2142 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2143 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2144 spin_unlock_irq(&cm_id_priv->lock); 2145 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2146 counter[CM_RTU_COUNTER]); 2147 goto out; 2148 } 2149 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2150 2151 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2152 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2153 if (!ret) 2154 list_add_tail(&work->list, &cm_id_priv->work_list); 2155 spin_unlock_irq(&cm_id_priv->lock); 2156 2157 if (ret) 2158 cm_process_work(cm_id_priv, work); 2159 else 2160 cm_deref_id(cm_id_priv); 2161 return 0; 2162out: 2163 cm_deref_id(cm_id_priv); 2164 return -EINVAL; 2165} 2166 2167static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2168 struct cm_id_private *cm_id_priv, 2169 const void *private_data, 2170 u8 private_data_len) 2171{ 2172 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2173 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2174 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2175 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2176 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2177 2178 if (private_data && private_data_len) 2179 memcpy(dreq_msg->private_data, private_data, private_data_len); 2180} 2181 2182int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2183 const void *private_data, 2184 u8 private_data_len) 2185{ 2186 struct cm_id_private *cm_id_priv; 2187 struct ib_mad_send_buf *msg; 2188 unsigned long flags; 2189 int ret; 2190 2191 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2192 return -EINVAL; 2193 2194 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2195 spin_lock_irqsave(&cm_id_priv->lock, flags); 2196 if (cm_id->state != IB_CM_ESTABLISHED) { 2197 ret = -EINVAL; 2198 goto out; 2199 } 2200 2201 if (cm_id->lap_state == IB_CM_LAP_SENT || 2202 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2203 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2204 2205 ret = cm_alloc_msg(cm_id_priv, &msg); 2206 if (ret) { 2207 cm_enter_timewait(cm_id_priv); 2208 goto out; 2209 } 2210 2211 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2212 private_data, private_data_len); 2213 msg->timeout_ms = cm_id_priv->timeout_ms; 2214 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2215 2216 ret = ib_post_send_mad(msg, NULL); 2217 if (ret) { 2218 cm_enter_timewait(cm_id_priv); 2219 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2220 cm_free_msg(msg); 2221 return ret; 2222 } 2223 2224 cm_id->state = IB_CM_DREQ_SENT; 2225 cm_id_priv->msg = msg; 2226out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2227 return ret; 2228} 2229EXPORT_SYMBOL(ib_send_cm_dreq); 2230 2231static void cm_format_drep(struct cm_drep_msg *drep_msg, 2232 struct cm_id_private *cm_id_priv, 2233 const void *private_data, 2234 u8 private_data_len) 2235{ 2236 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2237 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2238 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2239 2240 if (private_data && private_data_len) 2241 memcpy(drep_msg->private_data, private_data, private_data_len); 2242} 2243 2244int ib_send_cm_drep(struct ib_cm_id *cm_id, 2245 const void *private_data, 2246 u8 private_data_len) 2247{ 2248 struct cm_id_private *cm_id_priv; 2249 struct ib_mad_send_buf *msg; 2250 unsigned long flags; 2251 void *data; 2252 int ret; 2253 2254 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2255 return -EINVAL; 2256 2257 data = cm_copy_private_data(private_data, private_data_len); 2258 if (IS_ERR(data)) 2259 return PTR_ERR(data); 2260 2261 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2262 spin_lock_irqsave(&cm_id_priv->lock, flags); 2263 if (cm_id->state != IB_CM_DREQ_RCVD) { 2264 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2265 kfree(data); 2266 return -EINVAL; 2267 } 2268 2269 cm_set_private_data(cm_id_priv, data, private_data_len); 2270 cm_enter_timewait(cm_id_priv); 2271 2272 ret = cm_alloc_msg(cm_id_priv, &msg); 2273 if (ret) 2274 goto out; 2275 2276 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2277 private_data, private_data_len); 2278 2279 ret = ib_post_send_mad(msg, NULL); 2280 if (ret) { 2281 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2282 cm_free_msg(msg); 2283 return ret; 2284 } 2285 2286out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2287 return ret; 2288} 2289EXPORT_SYMBOL(ib_send_cm_drep); 2290 2291static int cm_issue_drep(struct cm_port *port, 2292 struct ib_mad_recv_wc *mad_recv_wc) 2293{ 2294 struct ib_mad_send_buf *msg = NULL; 2295 struct cm_dreq_msg *dreq_msg; 2296 struct cm_drep_msg *drep_msg; 2297 int ret; 2298 2299 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2300 if (ret) 2301 return ret; 2302 2303 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2304 drep_msg = (struct cm_drep_msg *) msg->mad; 2305 2306 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2307 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2308 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2309 2310 ret = ib_post_send_mad(msg, NULL); 2311 if (ret) 2312 cm_free_msg(msg); 2313 2314 return ret; 2315} 2316 2317static int cm_dreq_handler(struct cm_work *work) 2318{ 2319 struct cm_id_private *cm_id_priv; 2320 struct cm_dreq_msg *dreq_msg; 2321 struct ib_mad_send_buf *msg = NULL; 2322 int ret; 2323 2324 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2325 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2326 dreq_msg->local_comm_id); 2327 if (!cm_id_priv) { 2328 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2329 counter[CM_DREQ_COUNTER]); 2330 cm_issue_drep(work->port, work->mad_recv_wc); 2331 return -EINVAL; 2332 } 2333 2334 work->cm_event.private_data = &dreq_msg->private_data; 2335 2336 spin_lock_irq(&cm_id_priv->lock); 2337 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2338 goto unlock; 2339 2340 switch (cm_id_priv->id.state) { 2341 case IB_CM_REP_SENT: 2342 case IB_CM_DREQ_SENT: 2343 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2344 break; 2345 case IB_CM_ESTABLISHED: 2346 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2347 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2348 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2349 break; 2350 case IB_CM_MRA_REP_RCVD: 2351 break; 2352 case IB_CM_TIMEWAIT: 2353 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2354 counter[CM_DREQ_COUNTER]); 2355 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2356 if (IS_ERR(msg)) 2357 goto unlock; 2358 2359 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2360 cm_id_priv->private_data, 2361 cm_id_priv->private_data_len); 2362 spin_unlock_irq(&cm_id_priv->lock); 2363 2364 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2365 ib_post_send_mad(msg, NULL)) 2366 cm_free_msg(msg); 2367 goto deref; 2368 case IB_CM_DREQ_RCVD: 2369 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2370 counter[CM_DREQ_COUNTER]); 2371 goto unlock; 2372 default: 2373 goto unlock; 2374 } 2375 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2376 cm_id_priv->tid = dreq_msg->hdr.tid; 2377 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2378 if (!ret) 2379 list_add_tail(&work->list, &cm_id_priv->work_list); 2380 spin_unlock_irq(&cm_id_priv->lock); 2381 2382 if (ret) 2383 cm_process_work(cm_id_priv, work); 2384 else 2385 cm_deref_id(cm_id_priv); 2386 return 0; 2387 2388unlock: spin_unlock_irq(&cm_id_priv->lock); 2389deref: cm_deref_id(cm_id_priv); 2390 return -EINVAL; 2391} 2392 2393static int cm_drep_handler(struct cm_work *work) 2394{ 2395 struct cm_id_private *cm_id_priv; 2396 struct cm_drep_msg *drep_msg; 2397 int ret; 2398 2399 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2400 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2401 drep_msg->local_comm_id); 2402 if (!cm_id_priv) 2403 return -EINVAL; 2404 2405 work->cm_event.private_data = &drep_msg->private_data; 2406 2407 spin_lock_irq(&cm_id_priv->lock); 2408 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2409 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2410 spin_unlock_irq(&cm_id_priv->lock); 2411 goto out; 2412 } 2413 cm_enter_timewait(cm_id_priv); 2414 2415 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2416 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2417 if (!ret) 2418 list_add_tail(&work->list, &cm_id_priv->work_list); 2419 spin_unlock_irq(&cm_id_priv->lock); 2420 2421 if (ret) 2422 cm_process_work(cm_id_priv, work); 2423 else 2424 cm_deref_id(cm_id_priv); 2425 return 0; 2426out: 2427 cm_deref_id(cm_id_priv); 2428 return -EINVAL; 2429} 2430 2431int ib_send_cm_rej(struct ib_cm_id *cm_id, 2432 enum ib_cm_rej_reason reason, 2433 void *ari, 2434 u8 ari_length, 2435 const void *private_data, 2436 u8 private_data_len) 2437{ 2438 struct cm_id_private *cm_id_priv; 2439 struct ib_mad_send_buf *msg; 2440 unsigned long flags; 2441 int ret; 2442 2443 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2444 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2445 return -EINVAL; 2446 2447 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2448 2449 spin_lock_irqsave(&cm_id_priv->lock, flags); 2450 switch (cm_id->state) { 2451 case IB_CM_REQ_SENT: 2452 case IB_CM_MRA_REQ_RCVD: 2453 case IB_CM_REQ_RCVD: 2454 case IB_CM_MRA_REQ_SENT: 2455 case IB_CM_REP_RCVD: 2456 case IB_CM_MRA_REP_SENT: 2457 ret = cm_alloc_msg(cm_id_priv, &msg); 2458 if (!ret) 2459 cm_format_rej((struct cm_rej_msg *) msg->mad, 2460 cm_id_priv, reason, ari, ari_length, 2461 private_data, private_data_len); 2462 2463 cm_reset_to_idle(cm_id_priv); 2464 break; 2465 case IB_CM_REP_SENT: 2466 case IB_CM_MRA_REP_RCVD: 2467 ret = cm_alloc_msg(cm_id_priv, &msg); 2468 if (!ret) 2469 cm_format_rej((struct cm_rej_msg *) msg->mad, 2470 cm_id_priv, reason, ari, ari_length, 2471 private_data, private_data_len); 2472 2473 cm_enter_timewait(cm_id_priv); 2474 break; 2475 default: 2476 ret = -EINVAL; 2477 goto out; 2478 } 2479 2480 if (ret) 2481 goto out; 2482 2483 ret = ib_post_send_mad(msg, NULL); 2484 if (ret) 2485 cm_free_msg(msg); 2486 2487out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2488 return ret; 2489} 2490EXPORT_SYMBOL(ib_send_cm_rej); 2491 2492static void cm_format_rej_event(struct cm_work *work) 2493{ 2494 struct cm_rej_msg *rej_msg; 2495 struct ib_cm_rej_event_param *param; 2496 2497 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2498 param = &work->cm_event.param.rej_rcvd; 2499 param->ari = rej_msg->ari; 2500 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2501 param->reason = __be16_to_cpu(rej_msg->reason); 2502 work->cm_event.private_data = &rej_msg->private_data; 2503} 2504 2505static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2506{ 2507 struct cm_timewait_info *timewait_info; 2508 struct cm_id_private *cm_id_priv; 2509 __be32 remote_id; 2510 2511 remote_id = rej_msg->local_comm_id; 2512 2513 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2514 spin_lock_irq(&cm.lock); 2515 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2516 remote_id); 2517 if (!timewait_info) { 2518 spin_unlock_irq(&cm.lock); 2519 return NULL; 2520 } 2521 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2522 (timewait_info->work.local_id ^ 2523 cm.random_id_operand)); 2524 if (cm_id_priv) { 2525 if (cm_id_priv->id.remote_id == remote_id) 2526 atomic_inc(&cm_id_priv->refcount); 2527 else 2528 cm_id_priv = NULL; 2529 } 2530 spin_unlock_irq(&cm.lock); 2531 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2532 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2533 else 2534 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2535 2536 return cm_id_priv; 2537} 2538 2539static int cm_rej_handler(struct cm_work *work) 2540{ 2541 struct cm_id_private *cm_id_priv; 2542 struct cm_rej_msg *rej_msg; 2543 int ret; 2544 2545 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2546 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2547 if (!cm_id_priv) 2548 return -EINVAL; 2549 2550 cm_format_rej_event(work); 2551 2552 spin_lock_irq(&cm_id_priv->lock); 2553 switch (cm_id_priv->id.state) { 2554 case IB_CM_REQ_SENT: 2555 case IB_CM_MRA_REQ_RCVD: 2556 case IB_CM_REP_SENT: 2557 case IB_CM_MRA_REP_RCVD: 2558 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2559 /* fall through */ 2560 case IB_CM_REQ_RCVD: 2561 case IB_CM_MRA_REQ_SENT: 2562 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2563 cm_enter_timewait(cm_id_priv); 2564 else 2565 cm_reset_to_idle(cm_id_priv); 2566 break; 2567 case IB_CM_DREQ_SENT: 2568 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2569 /* fall through */ 2570 case IB_CM_REP_RCVD: 2571 case IB_CM_MRA_REP_SENT: 2572 cm_enter_timewait(cm_id_priv); 2573 break; 2574 case IB_CM_ESTABLISHED: 2575 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2576 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2577 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2578 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2579 cm_id_priv->msg); 2580 cm_enter_timewait(cm_id_priv); 2581 break; 2582 } 2583 /* fall through */ 2584 default: 2585 spin_unlock_irq(&cm_id_priv->lock); 2586 ret = -EINVAL; 2587 goto out; 2588 } 2589 2590 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2591 if (!ret) 2592 list_add_tail(&work->list, &cm_id_priv->work_list); 2593 spin_unlock_irq(&cm_id_priv->lock); 2594 2595 if (ret) 2596 cm_process_work(cm_id_priv, work); 2597 else 2598 cm_deref_id(cm_id_priv); 2599 return 0; 2600out: 2601 cm_deref_id(cm_id_priv); 2602 return -EINVAL; 2603} 2604 2605int ib_send_cm_mra(struct ib_cm_id *cm_id, 2606 u8 service_timeout, 2607 const void *private_data, 2608 u8 private_data_len) 2609{ 2610 struct cm_id_private *cm_id_priv; 2611 struct ib_mad_send_buf *msg; 2612 enum ib_cm_state cm_state; 2613 enum ib_cm_lap_state lap_state; 2614 enum cm_msg_response msg_response; 2615 void *data; 2616 unsigned long flags; 2617 int ret; 2618 2619 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2620 return -EINVAL; 2621 2622 data = cm_copy_private_data(private_data, private_data_len); 2623 if (IS_ERR(data)) 2624 return PTR_ERR(data); 2625 2626 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2627 2628 spin_lock_irqsave(&cm_id_priv->lock, flags); 2629 switch(cm_id_priv->id.state) { 2630 case IB_CM_REQ_RCVD: 2631 cm_state = IB_CM_MRA_REQ_SENT; 2632 lap_state = cm_id->lap_state; 2633 msg_response = CM_MSG_RESPONSE_REQ; 2634 break; 2635 case IB_CM_REP_RCVD: 2636 cm_state = IB_CM_MRA_REP_SENT; 2637 lap_state = cm_id->lap_state; 2638 msg_response = CM_MSG_RESPONSE_REP; 2639 break; 2640 case IB_CM_ESTABLISHED: 2641 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2642 cm_state = cm_id->state; 2643 lap_state = IB_CM_MRA_LAP_SENT; 2644 msg_response = CM_MSG_RESPONSE_OTHER; 2645 break; 2646 } 2647 default: 2648 ret = -EINVAL; 2649 goto error1; 2650 } 2651 2652 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2653 ret = cm_alloc_msg(cm_id_priv, &msg); 2654 if (ret) 2655 goto error1; 2656 2657 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2658 msg_response, service_timeout, 2659 private_data, private_data_len); 2660 ret = ib_post_send_mad(msg, NULL); 2661 if (ret) 2662 goto error2; 2663 } 2664 2665 cm_id->state = cm_state; 2666 cm_id->lap_state = lap_state; 2667 cm_id_priv->service_timeout = service_timeout; 2668 cm_set_private_data(cm_id_priv, data, private_data_len); 2669 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2670 return 0; 2671 2672error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2673 kfree(data); 2674 return ret; 2675 2676error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2677 kfree(data); 2678 cm_free_msg(msg); 2679 return ret; 2680} 2681EXPORT_SYMBOL(ib_send_cm_mra); 2682 2683static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2684{ 2685 switch (cm_mra_get_msg_mraed(mra_msg)) { 2686 case CM_MSG_RESPONSE_REQ: 2687 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2688 case CM_MSG_RESPONSE_REP: 2689 case CM_MSG_RESPONSE_OTHER: 2690 return cm_acquire_id(mra_msg->remote_comm_id, 2691 mra_msg->local_comm_id); 2692 default: 2693 return NULL; 2694 } 2695} 2696 2697static int cm_mra_handler(struct cm_work *work) 2698{ 2699 struct cm_id_private *cm_id_priv; 2700 struct cm_mra_msg *mra_msg; 2701 int timeout, ret; 2702 2703 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2704 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2705 if (!cm_id_priv) 2706 return -EINVAL; 2707 2708 work->cm_event.private_data = &mra_msg->private_data; 2709 work->cm_event.param.mra_rcvd.service_timeout = 2710 cm_mra_get_service_timeout(mra_msg); 2711 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2712 cm_convert_to_ms(cm_id_priv->av.timeout); 2713 2714 spin_lock_irq(&cm_id_priv->lock); 2715 switch (cm_id_priv->id.state) { 2716 case IB_CM_REQ_SENT: 2717 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2718 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2719 cm_id_priv->msg, timeout)) 2720 goto out; 2721 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2722 break; 2723 case IB_CM_REP_SENT: 2724 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2725 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2726 cm_id_priv->msg, timeout)) 2727 goto out; 2728 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2729 break; 2730 case IB_CM_ESTABLISHED: 2731 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2732 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2733 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2734 cm_id_priv->msg, timeout)) { 2735 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2736 atomic_long_inc(&work->port-> 2737 counter_group[CM_RECV_DUPLICATES]. 2738 counter[CM_MRA_COUNTER]); 2739 goto out; 2740 } 2741 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2742 break; 2743 case IB_CM_MRA_REQ_RCVD: 2744 case IB_CM_MRA_REP_RCVD: 2745 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2746 counter[CM_MRA_COUNTER]); 2747 /* fall through */ 2748 default: 2749 goto out; 2750 } 2751 2752 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2753 cm_id_priv->id.state; 2754 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2755 if (!ret) 2756 list_add_tail(&work->list, &cm_id_priv->work_list); 2757 spin_unlock_irq(&cm_id_priv->lock); 2758 2759 if (ret) 2760 cm_process_work(cm_id_priv, work); 2761 else 2762 cm_deref_id(cm_id_priv); 2763 return 0; 2764out: 2765 spin_unlock_irq(&cm_id_priv->lock); 2766 cm_deref_id(cm_id_priv); 2767 return -EINVAL; 2768} 2769 2770static void cm_format_lap(struct cm_lap_msg *lap_msg, 2771 struct cm_id_private *cm_id_priv, 2772 struct ib_sa_path_rec *alternate_path, 2773 const void *private_data, 2774 u8 private_data_len) 2775{ 2776 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2777 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2778 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2779 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2780 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2781 /* todo: need remote CM response timeout */ 2782 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2783 lap_msg->alt_local_lid = alternate_path->slid; 2784 lap_msg->alt_remote_lid = alternate_path->dlid; 2785 lap_msg->alt_local_gid = alternate_path->sgid; 2786 lap_msg->alt_remote_gid = alternate_path->dgid; 2787 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2788 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2789 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2790 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2791 cm_lap_set_sl(lap_msg, alternate_path->sl); 2792 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2793 cm_lap_set_local_ack_timeout(lap_msg, 2794 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2795 alternate_path->packet_life_time)); 2796 2797 if (private_data && private_data_len) 2798 memcpy(lap_msg->private_data, private_data, private_data_len); 2799} 2800 2801int ib_send_cm_lap(struct ib_cm_id *cm_id, 2802 struct ib_sa_path_rec *alternate_path, 2803 const void *private_data, 2804 u8 private_data_len) 2805{ 2806 struct cm_id_private *cm_id_priv; 2807 struct ib_mad_send_buf *msg; 2808 unsigned long flags; 2809 int ret; 2810 2811 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2812 return -EINVAL; 2813 2814 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2815 spin_lock_irqsave(&cm_id_priv->lock, flags); 2816 if (cm_id->state != IB_CM_ESTABLISHED || 2817 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2818 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2819 ret = -EINVAL; 2820 goto out; 2821 } 2822 2823 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av, 2824 cm_id_priv); 2825 if (ret) 2826 goto out; 2827 cm_id_priv->alt_av.timeout = 2828 cm_ack_timeout(cm_id_priv->target_ack_delay, 2829 cm_id_priv->alt_av.timeout - 1); 2830 2831 ret = cm_alloc_msg(cm_id_priv, &msg); 2832 if (ret) 2833 goto out; 2834 2835 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2836 alternate_path, private_data, private_data_len); 2837 msg->timeout_ms = cm_id_priv->timeout_ms; 2838 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2839 2840 ret = ib_post_send_mad(msg, NULL); 2841 if (ret) { 2842 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2843 cm_free_msg(msg); 2844 return ret; 2845 } 2846 2847 cm_id->lap_state = IB_CM_LAP_SENT; 2848 cm_id_priv->msg = msg; 2849 2850out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2851 return ret; 2852} 2853EXPORT_SYMBOL(ib_send_cm_lap); 2854 2855static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2856 struct ib_sa_path_rec *path, 2857 struct cm_lap_msg *lap_msg) 2858{ 2859 memset(path, 0, sizeof *path); 2860 path->dgid = lap_msg->alt_local_gid; 2861 path->sgid = lap_msg->alt_remote_gid; 2862 path->dlid = lap_msg->alt_local_lid; 2863 path->slid = lap_msg->alt_remote_lid; 2864 path->flow_label = cm_lap_get_flow_label(lap_msg); 2865 path->hop_limit = lap_msg->alt_hop_limit; 2866 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2867 path->reversible = 1; 2868 path->pkey = cm_id_priv->pkey; 2869 path->sl = cm_lap_get_sl(lap_msg); 2870 path->mtu_selector = IB_SA_EQ; 2871 path->mtu = cm_id_priv->path_mtu; 2872 path->rate_selector = IB_SA_EQ; 2873 path->rate = cm_lap_get_packet_rate(lap_msg); 2874 path->packet_life_time_selector = IB_SA_EQ; 2875 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2876 path->packet_life_time -= (path->packet_life_time > 0); 2877} 2878 2879static int cm_lap_handler(struct cm_work *work) 2880{ 2881 struct cm_id_private *cm_id_priv; 2882 struct cm_lap_msg *lap_msg; 2883 struct ib_cm_lap_event_param *param; 2884 struct ib_mad_send_buf *msg = NULL; 2885 int ret; 2886 2887 /* todo: verify LAP request and send reject APR if invalid. */ 2888 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2889 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2890 lap_msg->local_comm_id); 2891 if (!cm_id_priv) 2892 return -EINVAL; 2893 2894 param = &work->cm_event.param.lap_rcvd; 2895 param->alternate_path = &work->path[0]; 2896 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2897 work->cm_event.private_data = &lap_msg->private_data; 2898 2899 spin_lock_irq(&cm_id_priv->lock); 2900 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2901 goto unlock; 2902 2903 switch (cm_id_priv->id.lap_state) { 2904 case IB_CM_LAP_UNINIT: 2905 case IB_CM_LAP_IDLE: 2906 break; 2907 case IB_CM_MRA_LAP_SENT: 2908 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2909 counter[CM_LAP_COUNTER]); 2910 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc); 2911 if (IS_ERR(msg)) 2912 goto unlock; 2913 2914 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2915 CM_MSG_RESPONSE_OTHER, 2916 cm_id_priv->service_timeout, 2917 cm_id_priv->private_data, 2918 cm_id_priv->private_data_len); 2919 spin_unlock_irq(&cm_id_priv->lock); 2920 2921 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) || 2922 ib_post_send_mad(msg, NULL)) 2923 cm_free_msg(msg); 2924 goto deref; 2925 case IB_CM_LAP_RCVD: 2926 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2927 counter[CM_LAP_COUNTER]); 2928 goto unlock; 2929 default: 2930 goto unlock; 2931 } 2932 2933 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2934 cm_id_priv->tid = lap_msg->hdr.tid; 2935 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2936 work->mad_recv_wc->recv_buf.grh, 2937 &cm_id_priv->av); 2938 if (ret) 2939 goto unlock; 2940 ret = cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, 2941 cm_id_priv); 2942 if (ret) 2943 goto unlock; 2944 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2945 if (!ret) 2946 list_add_tail(&work->list, &cm_id_priv->work_list); 2947 spin_unlock_irq(&cm_id_priv->lock); 2948 2949 if (ret) 2950 cm_process_work(cm_id_priv, work); 2951 else 2952 cm_deref_id(cm_id_priv); 2953 return 0; 2954 2955unlock: spin_unlock_irq(&cm_id_priv->lock); 2956deref: cm_deref_id(cm_id_priv); 2957 return -EINVAL; 2958} 2959 2960static void cm_format_apr(struct cm_apr_msg *apr_msg, 2961 struct cm_id_private *cm_id_priv, 2962 enum ib_cm_apr_status status, 2963 void *info, 2964 u8 info_length, 2965 const void *private_data, 2966 u8 private_data_len) 2967{ 2968 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2969 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2970 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2971 apr_msg->ap_status = (u8) status; 2972 2973 if (info && info_length) { 2974 apr_msg->info_length = info_length; 2975 memcpy(apr_msg->info, info, info_length); 2976 } 2977 2978 if (private_data && private_data_len) 2979 memcpy(apr_msg->private_data, private_data, private_data_len); 2980} 2981 2982int ib_send_cm_apr(struct ib_cm_id *cm_id, 2983 enum ib_cm_apr_status status, 2984 void *info, 2985 u8 info_length, 2986 const void *private_data, 2987 u8 private_data_len) 2988{ 2989 struct cm_id_private *cm_id_priv; 2990 struct ib_mad_send_buf *msg; 2991 unsigned long flags; 2992 int ret; 2993 2994 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2995 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2996 return -EINVAL; 2997 2998 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2999 spin_lock_irqsave(&cm_id_priv->lock, flags); 3000 if (cm_id->state != IB_CM_ESTABLISHED || 3001 (cm_id->lap_state != IB_CM_LAP_RCVD && 3002 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 3003 ret = -EINVAL; 3004 goto out; 3005 } 3006 3007 ret = cm_alloc_msg(cm_id_priv, &msg); 3008 if (ret) 3009 goto out; 3010 3011 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 3012 info, info_length, private_data, private_data_len); 3013 ret = ib_post_send_mad(msg, NULL); 3014 if (ret) { 3015 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3016 cm_free_msg(msg); 3017 return ret; 3018 } 3019 3020 cm_id->lap_state = IB_CM_LAP_IDLE; 3021out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3022 return ret; 3023} 3024EXPORT_SYMBOL(ib_send_cm_apr); 3025 3026static int cm_apr_handler(struct cm_work *work) 3027{ 3028 struct cm_id_private *cm_id_priv; 3029 struct cm_apr_msg *apr_msg; 3030 int ret; 3031 3032 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3033 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 3034 apr_msg->local_comm_id); 3035 if (!cm_id_priv) 3036 return -EINVAL; /* Unmatched reply. */ 3037 3038 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3039 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3040 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3041 work->cm_event.private_data = &apr_msg->private_data; 3042 3043 spin_lock_irq(&cm_id_priv->lock); 3044 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3045 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3046 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3047 spin_unlock_irq(&cm_id_priv->lock); 3048 goto out; 3049 } 3050 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3051 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3052 cm_id_priv->msg = NULL; 3053 3054 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3055 if (!ret) 3056 list_add_tail(&work->list, &cm_id_priv->work_list); 3057 spin_unlock_irq(&cm_id_priv->lock); 3058 3059 if (ret) 3060 cm_process_work(cm_id_priv, work); 3061 else 3062 cm_deref_id(cm_id_priv); 3063 return 0; 3064out: 3065 cm_deref_id(cm_id_priv); 3066 return -EINVAL; 3067} 3068 3069static int cm_timewait_handler(struct cm_work *work) 3070{ 3071 struct cm_timewait_info *timewait_info; 3072 struct cm_id_private *cm_id_priv; 3073 int ret; 3074 3075 timewait_info = (struct cm_timewait_info *)work; 3076 spin_lock_irq(&cm.lock); 3077 list_del(&timewait_info->list); 3078 spin_unlock_irq(&cm.lock); 3079 3080 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3081 timewait_info->work.remote_id); 3082 if (!cm_id_priv) 3083 return -EINVAL; 3084 3085 spin_lock_irq(&cm_id_priv->lock); 3086 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3087 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3088 spin_unlock_irq(&cm_id_priv->lock); 3089 goto out; 3090 } 3091 cm_id_priv->id.state = IB_CM_IDLE; 3092 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3093 if (!ret) 3094 list_add_tail(&work->list, &cm_id_priv->work_list); 3095 spin_unlock_irq(&cm_id_priv->lock); 3096 3097 if (ret) 3098 cm_process_work(cm_id_priv, work); 3099 else 3100 cm_deref_id(cm_id_priv); 3101 return 0; 3102out: 3103 cm_deref_id(cm_id_priv); 3104 return -EINVAL; 3105} 3106 3107static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3108 struct cm_id_private *cm_id_priv, 3109 struct ib_cm_sidr_req_param *param) 3110{ 3111 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3112 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 3113 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3114 sidr_req_msg->pkey = param->path->pkey; 3115 sidr_req_msg->service_id = param->service_id; 3116 3117 if (param->private_data && param->private_data_len) 3118 memcpy(sidr_req_msg->private_data, param->private_data, 3119 param->private_data_len); 3120} 3121 3122int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3123 struct ib_cm_sidr_req_param *param) 3124{ 3125 struct cm_id_private *cm_id_priv; 3126 struct ib_mad_send_buf *msg; 3127 unsigned long flags; 3128 int ret; 3129 3130 if (!param->path || (param->private_data && 3131 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3132 return -EINVAL; 3133 3134 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3135 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv); 3136 if (ret) 3137 goto out; 3138 3139 cm_id->service_id = param->service_id; 3140 cm_id->service_mask = ~cpu_to_be64(0); 3141 cm_id_priv->timeout_ms = param->timeout_ms; 3142 cm_id_priv->max_cm_retries = param->max_cm_retries; 3143 ret = cm_alloc_msg(cm_id_priv, &msg); 3144 if (ret) 3145 goto out; 3146 3147 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3148 param); 3149 msg->timeout_ms = cm_id_priv->timeout_ms; 3150 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3151 3152 spin_lock_irqsave(&cm_id_priv->lock, flags); 3153 if (cm_id->state == IB_CM_IDLE) 3154 ret = ib_post_send_mad(msg, NULL); 3155 else 3156 ret = -EINVAL; 3157 3158 if (ret) { 3159 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3160 cm_free_msg(msg); 3161 goto out; 3162 } 3163 cm_id->state = IB_CM_SIDR_REQ_SENT; 3164 cm_id_priv->msg = msg; 3165 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3166out: 3167 return ret; 3168} 3169EXPORT_SYMBOL(ib_send_cm_sidr_req); 3170 3171static void cm_format_sidr_req_event(struct cm_work *work, 3172 const struct cm_id_private *rx_cm_id, 3173 struct ib_cm_id *listen_id) 3174{ 3175 struct cm_sidr_req_msg *sidr_req_msg; 3176 struct ib_cm_sidr_req_event_param *param; 3177 3178 sidr_req_msg = (struct cm_sidr_req_msg *) 3179 work->mad_recv_wc->recv_buf.mad; 3180 param = &work->cm_event.param.sidr_req_rcvd; 3181 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3182 param->listen_id = listen_id; 3183 param->service_id = sidr_req_msg->service_id; 3184 param->bth_pkey = cm_get_bth_pkey(work); 3185 param->port = work->port->port_num; 3186 param->sgid_index = rx_cm_id->av.ah_attr.grh.sgid_index; 3187 work->cm_event.private_data = &sidr_req_msg->private_data; 3188} 3189 3190static int cm_sidr_req_handler(struct cm_work *work) 3191{ 3192 struct ib_cm_id *cm_id; 3193 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3194 struct cm_sidr_req_msg *sidr_req_msg; 3195 struct ib_wc *wc; 3196 int ret; 3197 3198 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3199 if (IS_ERR(cm_id)) 3200 return PTR_ERR(cm_id); 3201 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3202 3203 /* Record SGID/SLID and request ID for lookup. */ 3204 sidr_req_msg = (struct cm_sidr_req_msg *) 3205 work->mad_recv_wc->recv_buf.mad; 3206 wc = work->mad_recv_wc->wc; 3207 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3208 cm_id_priv->av.dgid.global.interface_id = 0; 3209 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3210 work->mad_recv_wc->recv_buf.grh, 3211 &cm_id_priv->av); 3212 if (ret) 3213 goto out; 3214 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3215 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3216 atomic_inc(&cm_id_priv->work_count); 3217 3218 spin_lock_irq(&cm.lock); 3219 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3220 if (cur_cm_id_priv) { 3221 spin_unlock_irq(&cm.lock); 3222 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3223 counter[CM_SIDR_REQ_COUNTER]); 3224 goto out; /* Duplicate message. */ 3225 } 3226 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3227 cur_cm_id_priv = cm_find_listen(cm_id->device, 3228 sidr_req_msg->service_id); 3229 if (!cur_cm_id_priv) { 3230 spin_unlock_irq(&cm.lock); 3231 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3232 goto out; /* No match. */ 3233 } 3234 atomic_inc(&cur_cm_id_priv->refcount); 3235 atomic_inc(&cm_id_priv->refcount); 3236 spin_unlock_irq(&cm.lock); 3237 3238 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3239 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3240 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3241 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3242 3243 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id); 3244 cm_process_work(cm_id_priv, work); 3245 cm_deref_id(cur_cm_id_priv); 3246 return 0; 3247out: 3248 ib_destroy_cm_id(&cm_id_priv->id); 3249 return -EINVAL; 3250} 3251 3252static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3253 struct cm_id_private *cm_id_priv, 3254 struct ib_cm_sidr_rep_param *param) 3255{ 3256 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3257 cm_id_priv->tid); 3258 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3259 sidr_rep_msg->status = param->status; 3260 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3261 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3262 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3263 3264 if (param->info && param->info_length) 3265 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3266 3267 if (param->private_data && param->private_data_len) 3268 memcpy(sidr_rep_msg->private_data, param->private_data, 3269 param->private_data_len); 3270} 3271 3272int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3273 struct ib_cm_sidr_rep_param *param) 3274{ 3275 struct cm_id_private *cm_id_priv; 3276 struct ib_mad_send_buf *msg; 3277 unsigned long flags; 3278 int ret; 3279 3280 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3281 (param->private_data && 3282 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3283 return -EINVAL; 3284 3285 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3286 spin_lock_irqsave(&cm_id_priv->lock, flags); 3287 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3288 ret = -EINVAL; 3289 goto error; 3290 } 3291 3292 ret = cm_alloc_msg(cm_id_priv, &msg); 3293 if (ret) 3294 goto error; 3295 3296 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3297 param); 3298 ret = ib_post_send_mad(msg, NULL); 3299 if (ret) { 3300 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3301 cm_free_msg(msg); 3302 return ret; 3303 } 3304 cm_id->state = IB_CM_IDLE; 3305 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3306 3307 spin_lock_irqsave(&cm.lock, flags); 3308 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3309 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3310 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3311 } 3312 spin_unlock_irqrestore(&cm.lock, flags); 3313 return 0; 3314 3315error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3316 return ret; 3317} 3318EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3319 3320static void cm_format_sidr_rep_event(struct cm_work *work) 3321{ 3322 struct cm_sidr_rep_msg *sidr_rep_msg; 3323 struct ib_cm_sidr_rep_event_param *param; 3324 3325 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3326 work->mad_recv_wc->recv_buf.mad; 3327 param = &work->cm_event.param.sidr_rep_rcvd; 3328 param->status = sidr_rep_msg->status; 3329 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3330 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3331 param->info = &sidr_rep_msg->info; 3332 param->info_len = sidr_rep_msg->info_length; 3333 work->cm_event.private_data = &sidr_rep_msg->private_data; 3334} 3335 3336static int cm_sidr_rep_handler(struct cm_work *work) 3337{ 3338 struct cm_sidr_rep_msg *sidr_rep_msg; 3339 struct cm_id_private *cm_id_priv; 3340 3341 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3342 work->mad_recv_wc->recv_buf.mad; 3343 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3344 if (!cm_id_priv) 3345 return -EINVAL; /* Unmatched reply. */ 3346 3347 spin_lock_irq(&cm_id_priv->lock); 3348 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3349 spin_unlock_irq(&cm_id_priv->lock); 3350 goto out; 3351 } 3352 cm_id_priv->id.state = IB_CM_IDLE; 3353 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3354 spin_unlock_irq(&cm_id_priv->lock); 3355 3356 cm_format_sidr_rep_event(work); 3357 cm_process_work(cm_id_priv, work); 3358 return 0; 3359out: 3360 cm_deref_id(cm_id_priv); 3361 return -EINVAL; 3362} 3363 3364static void cm_process_send_error(struct ib_mad_send_buf *msg, 3365 enum ib_wc_status wc_status) 3366{ 3367 struct cm_id_private *cm_id_priv; 3368 struct ib_cm_event cm_event; 3369 enum ib_cm_state state; 3370 int ret; 3371 3372 memset(&cm_event, 0, sizeof cm_event); 3373 cm_id_priv = msg->context[0]; 3374 3375 /* Discard old sends or ones without a response. */ 3376 spin_lock_irq(&cm_id_priv->lock); 3377 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3378 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3379 goto discard; 3380 3381 switch (state) { 3382 case IB_CM_REQ_SENT: 3383 case IB_CM_MRA_REQ_RCVD: 3384 cm_reset_to_idle(cm_id_priv); 3385 cm_event.event = IB_CM_REQ_ERROR; 3386 break; 3387 case IB_CM_REP_SENT: 3388 case IB_CM_MRA_REP_RCVD: 3389 cm_reset_to_idle(cm_id_priv); 3390 cm_event.event = IB_CM_REP_ERROR; 3391 break; 3392 case IB_CM_DREQ_SENT: 3393 cm_enter_timewait(cm_id_priv); 3394 cm_event.event = IB_CM_DREQ_ERROR; 3395 break; 3396 case IB_CM_SIDR_REQ_SENT: 3397 cm_id_priv->id.state = IB_CM_IDLE; 3398 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3399 break; 3400 default: 3401 goto discard; 3402 } 3403 spin_unlock_irq(&cm_id_priv->lock); 3404 cm_event.param.send_status = wc_status; 3405 3406 /* No other events can occur on the cm_id at this point. */ 3407 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3408 cm_free_msg(msg); 3409 if (ret) 3410 ib_destroy_cm_id(&cm_id_priv->id); 3411 return; 3412discard: 3413 spin_unlock_irq(&cm_id_priv->lock); 3414 cm_free_msg(msg); 3415} 3416 3417static void cm_send_handler(struct ib_mad_agent *mad_agent, 3418 struct ib_mad_send_wc *mad_send_wc) 3419{ 3420 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3421 struct cm_port *port; 3422 u16 attr_index; 3423 3424 port = mad_agent->context; 3425 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3426 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3427 3428 /* 3429 * If the send was in response to a received message (context[0] is not 3430 * set to a cm_id), and is not a REJ, then it is a send that was 3431 * manually retried. 3432 */ 3433 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3434 msg->retries = 1; 3435 3436 atomic_long_add(1 + msg->retries, 3437 &port->counter_group[CM_XMIT].counter[attr_index]); 3438 if (msg->retries) 3439 atomic_long_add(msg->retries, 3440 &port->counter_group[CM_XMIT_RETRIES]. 3441 counter[attr_index]); 3442 3443 switch (mad_send_wc->status) { 3444 case IB_WC_SUCCESS: 3445 case IB_WC_WR_FLUSH_ERR: 3446 cm_free_msg(msg); 3447 break; 3448 default: 3449 if (msg->context[0] && msg->context[1]) 3450 cm_process_send_error(msg, mad_send_wc->status); 3451 else 3452 cm_free_msg(msg); 3453 break; 3454 } 3455} 3456 3457static void cm_work_handler(struct work_struct *_work) 3458{ 3459 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3460 int ret; 3461 3462 switch (work->cm_event.event) { 3463 case IB_CM_REQ_RECEIVED: 3464 ret = cm_req_handler(work); 3465 break; 3466 case IB_CM_MRA_RECEIVED: 3467 ret = cm_mra_handler(work); 3468 break; 3469 case IB_CM_REJ_RECEIVED: 3470 ret = cm_rej_handler(work); 3471 break; 3472 case IB_CM_REP_RECEIVED: 3473 ret = cm_rep_handler(work); 3474 break; 3475 case IB_CM_RTU_RECEIVED: 3476 ret = cm_rtu_handler(work); 3477 break; 3478 case IB_CM_USER_ESTABLISHED: 3479 ret = cm_establish_handler(work); 3480 break; 3481 case IB_CM_DREQ_RECEIVED: 3482 ret = cm_dreq_handler(work); 3483 break; 3484 case IB_CM_DREP_RECEIVED: 3485 ret = cm_drep_handler(work); 3486 break; 3487 case IB_CM_SIDR_REQ_RECEIVED: 3488 ret = cm_sidr_req_handler(work); 3489 break; 3490 case IB_CM_SIDR_REP_RECEIVED: 3491 ret = cm_sidr_rep_handler(work); 3492 break; 3493 case IB_CM_LAP_RECEIVED: 3494 ret = cm_lap_handler(work); 3495 break; 3496 case IB_CM_APR_RECEIVED: 3497 ret = cm_apr_handler(work); 3498 break; 3499 case IB_CM_TIMEWAIT_EXIT: 3500 ret = cm_timewait_handler(work); 3501 break; 3502 default: 3503 ret = -EINVAL; 3504 break; 3505 } 3506 if (ret) 3507 cm_free_work(work); 3508} 3509 3510static int cm_establish(struct ib_cm_id *cm_id) 3511{ 3512 struct cm_id_private *cm_id_priv; 3513 struct cm_work *work; 3514 unsigned long flags; 3515 int ret = 0; 3516 struct cm_device *cm_dev; 3517 3518 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3519 if (!cm_dev) 3520 return -ENODEV; 3521 3522 work = kmalloc(sizeof *work, GFP_ATOMIC); 3523 if (!work) 3524 return -ENOMEM; 3525 3526 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3527 spin_lock_irqsave(&cm_id_priv->lock, flags); 3528 switch (cm_id->state) 3529 { 3530 case IB_CM_REP_SENT: 3531 case IB_CM_MRA_REP_RCVD: 3532 cm_id->state = IB_CM_ESTABLISHED; 3533 break; 3534 case IB_CM_ESTABLISHED: 3535 ret = -EISCONN; 3536 break; 3537 default: 3538 ret = -EINVAL; 3539 break; 3540 } 3541 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3542 3543 if (ret) { 3544 kfree(work); 3545 goto out; 3546 } 3547 3548 /* 3549 * The CM worker thread may try to destroy the cm_id before it 3550 * can execute this work item. To prevent potential deadlock, 3551 * we need to find the cm_id once we're in the context of the 3552 * worker thread, rather than holding a reference on it. 3553 */ 3554 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3555 work->local_id = cm_id->local_id; 3556 work->remote_id = cm_id->remote_id; 3557 work->mad_recv_wc = NULL; 3558 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3559 3560 /* Check if the device started its remove_one */ 3561 spin_lock_irqsave(&cm.lock, flags); 3562 if (!cm_dev->going_down) { 3563 queue_delayed_work(cm.wq, &work->work, 0); 3564 } else { 3565 kfree(work); 3566 ret = -ENODEV; 3567 } 3568 spin_unlock_irqrestore(&cm.lock, flags); 3569 3570out: 3571 return ret; 3572} 3573 3574static int cm_migrate(struct ib_cm_id *cm_id) 3575{ 3576 struct cm_id_private *cm_id_priv; 3577 struct cm_av tmp_av; 3578 unsigned long flags; 3579 int tmp_send_port_not_ready; 3580 int ret = 0; 3581 3582 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3583 spin_lock_irqsave(&cm_id_priv->lock, flags); 3584 if (cm_id->state == IB_CM_ESTABLISHED && 3585 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3586 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3587 cm_id->lap_state = IB_CM_LAP_IDLE; 3588 /* Swap address vector */ 3589 tmp_av = cm_id_priv->av; 3590 cm_id_priv->av = cm_id_priv->alt_av; 3591 cm_id_priv->alt_av = tmp_av; 3592 /* Swap port send ready state */ 3593 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3594 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3595 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3596 } else 3597 ret = -EINVAL; 3598 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3599 3600 return ret; 3601} 3602 3603int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3604{ 3605 int ret; 3606 3607 switch (event) { 3608 case IB_EVENT_COMM_EST: 3609 ret = cm_establish(cm_id); 3610 break; 3611 case IB_EVENT_PATH_MIG: 3612 ret = cm_migrate(cm_id); 3613 break; 3614 default: 3615 ret = -EINVAL; 3616 } 3617 return ret; 3618} 3619EXPORT_SYMBOL(ib_cm_notify); 3620 3621static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3622 struct ib_mad_send_buf *send_buf, 3623 struct ib_mad_recv_wc *mad_recv_wc) 3624{ 3625 struct cm_port *port = mad_agent->context; 3626 struct cm_work *work; 3627 enum ib_cm_event_type event; 3628 u16 attr_id; 3629 int paths = 0; 3630 int going_down = 0; 3631 3632 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3633 case CM_REQ_ATTR_ID: 3634 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3635 alt_local_lid != 0); 3636 event = IB_CM_REQ_RECEIVED; 3637 break; 3638 case CM_MRA_ATTR_ID: 3639 event = IB_CM_MRA_RECEIVED; 3640 break; 3641 case CM_REJ_ATTR_ID: 3642 event = IB_CM_REJ_RECEIVED; 3643 break; 3644 case CM_REP_ATTR_ID: 3645 event = IB_CM_REP_RECEIVED; 3646 break; 3647 case CM_RTU_ATTR_ID: 3648 event = IB_CM_RTU_RECEIVED; 3649 break; 3650 case CM_DREQ_ATTR_ID: 3651 event = IB_CM_DREQ_RECEIVED; 3652 break; 3653 case CM_DREP_ATTR_ID: 3654 event = IB_CM_DREP_RECEIVED; 3655 break; 3656 case CM_SIDR_REQ_ATTR_ID: 3657 event = IB_CM_SIDR_REQ_RECEIVED; 3658 break; 3659 case CM_SIDR_REP_ATTR_ID: 3660 event = IB_CM_SIDR_REP_RECEIVED; 3661 break; 3662 case CM_LAP_ATTR_ID: 3663 paths = 1; 3664 event = IB_CM_LAP_RECEIVED; 3665 break; 3666 case CM_APR_ATTR_ID: 3667 event = IB_CM_APR_RECEIVED; 3668 break; 3669 default: 3670 ib_free_recv_mad(mad_recv_wc); 3671 return; 3672 } 3673 3674 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3675 atomic_long_inc(&port->counter_group[CM_RECV]. 3676 counter[attr_id - CM_ATTR_ID_OFFSET]); 3677 3678 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3679 GFP_KERNEL); 3680 if (!work) { 3681 ib_free_recv_mad(mad_recv_wc); 3682 return; 3683 } 3684 3685 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3686 work->cm_event.event = event; 3687 work->mad_recv_wc = mad_recv_wc; 3688 work->port = port; 3689 3690 /* Check if the device started its remove_one */ 3691 spin_lock_irq(&cm.lock); 3692 if (!port->cm_dev->going_down) 3693 queue_delayed_work(cm.wq, &work->work, 0); 3694 else 3695 going_down = 1; 3696 spin_unlock_irq(&cm.lock); 3697 3698 if (going_down) { 3699 kfree(work); 3700 ib_free_recv_mad(mad_recv_wc); 3701 } 3702} 3703 3704static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3705 struct ib_qp_attr *qp_attr, 3706 int *qp_attr_mask) 3707{ 3708 unsigned long flags; 3709 int ret; 3710 3711 spin_lock_irqsave(&cm_id_priv->lock, flags); 3712 switch (cm_id_priv->id.state) { 3713 case IB_CM_REQ_SENT: 3714 case IB_CM_MRA_REQ_RCVD: 3715 case IB_CM_REQ_RCVD: 3716 case IB_CM_MRA_REQ_SENT: 3717 case IB_CM_REP_RCVD: 3718 case IB_CM_MRA_REP_SENT: 3719 case IB_CM_REP_SENT: 3720 case IB_CM_MRA_REP_RCVD: 3721 case IB_CM_ESTABLISHED: 3722 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3723 IB_QP_PKEY_INDEX | IB_QP_PORT; 3724 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3725 if (cm_id_priv->responder_resources) 3726 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3727 IB_ACCESS_REMOTE_ATOMIC; 3728 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3729 qp_attr->port_num = cm_id_priv->av.port->port_num; 3730 ret = 0; 3731 break; 3732 default: 3733 ret = -EINVAL; 3734 break; 3735 } 3736 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3737 return ret; 3738} 3739 3740static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3741 struct ib_qp_attr *qp_attr, 3742 int *qp_attr_mask) 3743{ 3744 unsigned long flags; 3745 int ret; 3746 3747 spin_lock_irqsave(&cm_id_priv->lock, flags); 3748 switch (cm_id_priv->id.state) { 3749 case IB_CM_REQ_RCVD: 3750 case IB_CM_MRA_REQ_SENT: 3751 case IB_CM_REP_RCVD: 3752 case IB_CM_MRA_REP_SENT: 3753 case IB_CM_REP_SENT: 3754 case IB_CM_MRA_REP_RCVD: 3755 case IB_CM_ESTABLISHED: 3756 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3757 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3758 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3759 qp_attr->path_mtu = cm_id_priv->path_mtu; 3760 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3761 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3762 if (cm_id_priv->qp_type == IB_QPT_RC || 3763 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3764 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3765 IB_QP_MIN_RNR_TIMER; 3766 qp_attr->max_dest_rd_atomic = 3767 cm_id_priv->responder_resources; 3768 qp_attr->min_rnr_timer = 0; 3769 } 3770 if (cm_id_priv->alt_av.ah_attr.dlid) { 3771 *qp_attr_mask |= IB_QP_ALT_PATH; 3772 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3773 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3774 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3775 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3776 } 3777 ret = 0; 3778 break; 3779 default: 3780 ret = -EINVAL; 3781 break; 3782 } 3783 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3784 return ret; 3785} 3786 3787static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3788 struct ib_qp_attr *qp_attr, 3789 int *qp_attr_mask) 3790{ 3791 unsigned long flags; 3792 int ret; 3793 3794 spin_lock_irqsave(&cm_id_priv->lock, flags); 3795 switch (cm_id_priv->id.state) { 3796 /* Allow transition to RTS before sending REP */ 3797 case IB_CM_REQ_RCVD: 3798 case IB_CM_MRA_REQ_SENT: 3799 3800 case IB_CM_REP_RCVD: 3801 case IB_CM_MRA_REP_SENT: 3802 case IB_CM_REP_SENT: 3803 case IB_CM_MRA_REP_RCVD: 3804 case IB_CM_ESTABLISHED: 3805 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3806 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3807 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3808 switch (cm_id_priv->qp_type) { 3809 case IB_QPT_RC: 3810 case IB_QPT_XRC_INI: 3811 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3812 IB_QP_MAX_QP_RD_ATOMIC; 3813 qp_attr->retry_cnt = cm_id_priv->retry_count; 3814 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3815 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3816 /* fall through */ 3817 case IB_QPT_XRC_TGT: 3818 *qp_attr_mask |= IB_QP_TIMEOUT; 3819 qp_attr->timeout = cm_id_priv->av.timeout; 3820 break; 3821 default: 3822 break; 3823 } 3824 if (cm_id_priv->alt_av.ah_attr.dlid) { 3825 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3826 qp_attr->path_mig_state = IB_MIG_REARM; 3827 } 3828 } else { 3829 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3830 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3831 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3832 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3833 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3834 qp_attr->path_mig_state = IB_MIG_REARM; 3835 } 3836 ret = 0; 3837 break; 3838 default: 3839 ret = -EINVAL; 3840 break; 3841 } 3842 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3843 return ret; 3844} 3845 3846int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3847 struct ib_qp_attr *qp_attr, 3848 int *qp_attr_mask) 3849{ 3850 struct cm_id_private *cm_id_priv; 3851 int ret; 3852 3853 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3854 switch (qp_attr->qp_state) { 3855 case IB_QPS_INIT: 3856 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3857 break; 3858 case IB_QPS_RTR: 3859 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3860 break; 3861 case IB_QPS_RTS: 3862 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3863 break; 3864 default: 3865 ret = -EINVAL; 3866 break; 3867 } 3868 return ret; 3869} 3870EXPORT_SYMBOL(ib_cm_init_qp_attr); 3871 3872static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3873 char *buf) 3874{ 3875 struct cm_counter_group *group; 3876 struct cm_counter_attribute *cm_attr; 3877 3878 group = container_of(obj, struct cm_counter_group, obj); 3879 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3880 3881 return sprintf(buf, "%ld\n", 3882 atomic_long_read(&group->counter[cm_attr->index])); 3883} 3884 3885static const struct sysfs_ops cm_counter_ops = { 3886 .show = cm_show_counter 3887}; 3888 3889static struct kobj_type cm_counter_obj_type = { 3890 .sysfs_ops = &cm_counter_ops, 3891 .default_attrs = cm_counter_default_attrs 3892}; 3893 3894static void cm_release_port_obj(struct kobject *obj) 3895{ 3896 struct cm_port *cm_port; 3897 3898 cm_port = container_of(obj, struct cm_port, port_obj); 3899 kfree(cm_port); 3900} 3901 3902static struct kobj_type cm_port_obj_type = { 3903 .release = cm_release_port_obj 3904}; 3905 3906static char *cm_devnode(struct device *dev, umode_t *mode) 3907{ 3908 if (mode) 3909 *mode = 0666; 3910 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3911} 3912 3913struct class cm_class = { 3914 .owner = THIS_MODULE, 3915 .name = "infiniband_cm", 3916 .devnode = cm_devnode, 3917}; 3918EXPORT_SYMBOL(cm_class); 3919 3920static int cm_create_port_fs(struct cm_port *port) 3921{ 3922 int i, ret; 3923 3924 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3925 &port->cm_dev->device->kobj, 3926 "%d", port->port_num); 3927 if (ret) { 3928 kfree(port); 3929 return ret; 3930 } 3931 3932 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3933 ret = kobject_init_and_add(&port->counter_group[i].obj, 3934 &cm_counter_obj_type, 3935 &port->port_obj, 3936 "%s", counter_group_names[i]); 3937 if (ret) 3938 goto error; 3939 } 3940 3941 return 0; 3942 3943error: 3944 while (i--) 3945 kobject_put(&port->counter_group[i].obj); 3946 kobject_put(&port->port_obj); 3947 return ret; 3948 3949} 3950 3951static void cm_remove_port_fs(struct cm_port *port) 3952{ 3953 int i; 3954 3955 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3956 kobject_put(&port->counter_group[i].obj); 3957 3958 kobject_put(&port->port_obj); 3959} 3960 3961static void cm_add_one(struct ib_device *ib_device) 3962{ 3963 struct cm_device *cm_dev; 3964 struct cm_port *port; 3965 struct ib_mad_reg_req reg_req = { 3966 .mgmt_class = IB_MGMT_CLASS_CM, 3967 .mgmt_class_version = IB_CM_CLASS_VERSION, 3968 }; 3969 struct ib_port_modify port_modify = { 3970 .set_port_cap_mask = IB_PORT_CM_SUP 3971 }; 3972 unsigned long flags; 3973 int ret; 3974 int count = 0; 3975 u8 i; 3976 3977 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3978 ib_device->phys_port_cnt, GFP_KERNEL); 3979 if (!cm_dev) 3980 return; 3981 3982 cm_dev->ib_device = ib_device; 3983 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 3984 cm_dev->going_down = 0; 3985 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3986 MKDEV(0, 0), NULL, 3987 "%s", ib_device->name); 3988 if (IS_ERR(cm_dev->device)) { 3989 kfree(cm_dev); 3990 return; 3991 } 3992 3993 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3994 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3995 if (!rdma_cap_ib_cm(ib_device, i)) 3996 continue; 3997 3998 port = kzalloc(sizeof *port, GFP_KERNEL); 3999 if (!port) 4000 goto error1; 4001 4002 cm_dev->port[i-1] = port; 4003 port->cm_dev = cm_dev; 4004 port->port_num = i; 4005 4006 INIT_LIST_HEAD(&port->cm_priv_prim_list); 4007 INIT_LIST_HEAD(&port->cm_priv_altr_list); 4008 4009 ret = cm_create_port_fs(port); 4010 if (ret) 4011 goto error1; 4012 4013 port->mad_agent = ib_register_mad_agent(ib_device, i, 4014 IB_QPT_GSI, 4015 ®_req, 4016 0, 4017 cm_send_handler, 4018 cm_recv_handler, 4019 port, 4020 0); 4021 if (IS_ERR(port->mad_agent)) 4022 goto error2; 4023 4024 ret = ib_modify_port(ib_device, i, 0, &port_modify); 4025 if (ret) 4026 goto error3; 4027 4028 count++; 4029 } 4030 4031 if (!count) 4032 goto free; 4033 4034 ib_set_client_data(ib_device, &cm_client, cm_dev); 4035 4036 write_lock_irqsave(&cm.device_lock, flags); 4037 list_add_tail(&cm_dev->list, &cm.device_list); 4038 write_unlock_irqrestore(&cm.device_lock, flags); 4039 return; 4040 4041error3: 4042 ib_unregister_mad_agent(port->mad_agent); 4043error2: 4044 cm_remove_port_fs(port); 4045error1: 4046 port_modify.set_port_cap_mask = 0; 4047 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4048 while (--i) { 4049 if (!rdma_cap_ib_cm(ib_device, i)) 4050 continue; 4051 4052 port = cm_dev->port[i-1]; 4053 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4054 ib_unregister_mad_agent(port->mad_agent); 4055 cm_remove_port_fs(port); 4056 } 4057free: 4058 device_unregister(cm_dev->device); 4059 kfree(cm_dev); 4060} 4061 4062static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4063{ 4064 struct cm_device *cm_dev = client_data; 4065 struct cm_port *port; 4066 struct cm_id_private *cm_id_priv; 4067 struct ib_mad_agent *cur_mad_agent; 4068 struct ib_port_modify port_modify = { 4069 .clr_port_cap_mask = IB_PORT_CM_SUP 4070 }; 4071 unsigned long flags; 4072 int i; 4073 4074 if (!cm_dev) 4075 return; 4076 4077 write_lock_irqsave(&cm.device_lock, flags); 4078 list_del(&cm_dev->list); 4079 write_unlock_irqrestore(&cm.device_lock, flags); 4080 4081 spin_lock_irq(&cm.lock); 4082 cm_dev->going_down = 1; 4083 spin_unlock_irq(&cm.lock); 4084 4085 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4086 if (!rdma_cap_ib_cm(ib_device, i)) 4087 continue; 4088 4089 port = cm_dev->port[i-1]; 4090 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4091 /* Mark all the cm_id's as not valid */ 4092 spin_lock_irq(&cm.lock); 4093 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4094 cm_id_priv->altr_send_port_not_ready = 1; 4095 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4096 cm_id_priv->prim_send_port_not_ready = 1; 4097 spin_unlock_irq(&cm.lock); 4098 /* 4099 * We flush the queue here after the going_down set, this 4100 * verify that no new works will be queued in the recv handler, 4101 * after that we can call the unregister_mad_agent 4102 */ 4103 flush_workqueue(cm.wq); 4104 spin_lock_irq(&cm.state_lock); 4105 cur_mad_agent = port->mad_agent; 4106 port->mad_agent = NULL; 4107 spin_unlock_irq(&cm.state_lock); 4108 ib_unregister_mad_agent(cur_mad_agent); 4109 cm_remove_port_fs(port); 4110 } 4111 4112 device_unregister(cm_dev->device); 4113 kfree(cm_dev); 4114} 4115 4116static int __init ib_cm_init(void) 4117{ 4118 int ret; 4119 4120 memset(&cm, 0, sizeof cm); 4121 INIT_LIST_HEAD(&cm.device_list); 4122 rwlock_init(&cm.device_lock); 4123 spin_lock_init(&cm.lock); 4124 spin_lock_init(&cm.state_lock); 4125 cm.listen_service_table = RB_ROOT; 4126 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4127 cm.remote_id_table = RB_ROOT; 4128 cm.remote_qp_table = RB_ROOT; 4129 cm.remote_sidr_table = RB_ROOT; 4130 idr_init(&cm.local_id_table); 4131 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4132 INIT_LIST_HEAD(&cm.timewait_list); 4133 4134 ret = class_register(&cm_class); 4135 if (ret) { 4136 ret = -ENOMEM; 4137 goto error1; 4138 } 4139 4140 cm.wq = create_workqueue("ib_cm"); 4141 if (!cm.wq) { 4142 ret = -ENOMEM; 4143 goto error2; 4144 } 4145 4146 ret = ib_register_client(&cm_client); 4147 if (ret) 4148 goto error3; 4149 4150 return 0; 4151error3: 4152 destroy_workqueue(cm.wq); 4153error2: 4154 class_unregister(&cm_class); 4155error1: 4156 idr_destroy(&cm.local_id_table); 4157 return ret; 4158} 4159 4160static void __exit ib_cm_cleanup(void) 4161{ 4162 struct cm_timewait_info *timewait_info, *tmp; 4163 4164 spin_lock_irq(&cm.lock); 4165 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4166 cancel_delayed_work(&timewait_info->work.work); 4167 spin_unlock_irq(&cm.lock); 4168 4169 ib_unregister_client(&cm_client); 4170 destroy_workqueue(cm.wq); 4171 4172 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4173 cancel_delayed_work_sync(&timewait_info->work.work); 4174 list_del(&timewait_info->list); 4175 kfree(timewait_info); 4176 } 4177 4178 class_unregister(&cm_class); 4179 idr_destroy(&cm.local_id_table); 4180} 4181 4182module_init_order(ib_cm_init, SI_ORDER_SECOND); 4183module_exit_order(ib_cm_cleanup, SI_ORDER_SECOND); 4184 4185