cm.c revision 6e61d04f2d8c7ac4f67e1f498ed2a2a3ad8edaa3
1/* 2 * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 * 35 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $ 36 */ 37 38#include <linux/completion.h> 39#include <linux/dma-mapping.h> 40#include <linux/err.h> 41#include <linux/idr.h> 42#include <linux/interrupt.h> 43#include <linux/pci.h> 44#include <linux/rbtree.h> 45#include <linux/spinlock.h> 46#include <linux/workqueue.h> 47 48#include <rdma/ib_cache.h> 49#include <rdma/ib_cm.h> 50#include "cm_msgs.h" 51 52MODULE_AUTHOR("Sean Hefty"); 53MODULE_DESCRIPTION("InfiniBand CM"); 54MODULE_LICENSE("Dual BSD/GPL"); 55 56static void cm_add_one(struct ib_device *device); 57static void cm_remove_one(struct ib_device *device); 58 59static struct ib_client cm_client = { 60 .name = "cm", 61 .add = cm_add_one, 62 .remove = cm_remove_one 63}; 64 65static struct ib_cm { 66 spinlock_t lock; 67 struct list_head device_list; 68 rwlock_t device_lock; 69 struct rb_root listen_service_table; 70 u64 listen_service_id; 71 /* struct rb_root peer_service_table; todo: fix peer to peer */ 72 struct rb_root remote_qp_table; 73 struct rb_root remote_id_table; 74 struct rb_root remote_sidr_table; 75 struct idr local_id_table; 76 struct workqueue_struct *wq; 77} cm; 78 79struct cm_port { 80 struct cm_device *cm_dev; 81 struct ib_mad_agent *mad_agent; 82 u8 port_num; 83}; 84 85struct cm_device { 86 struct list_head list; 87 struct ib_device *device; 88 __be64 ca_guid; 89 struct cm_port port[0]; 90}; 91 92struct cm_av { 93 struct cm_port *port; 94 union ib_gid dgid; 95 struct ib_ah_attr ah_attr; 96 u16 pkey_index; 97 u8 packet_life_time; 98}; 99 100struct cm_work { 101 struct work_struct work; 102 struct list_head list; 103 struct cm_port *port; 104 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 105 __be32 local_id; /* Established / timewait */ 106 __be32 remote_id; 107 struct ib_cm_event cm_event; 108 struct ib_sa_path_rec path[0]; 109}; 110 111struct cm_timewait_info { 112 struct cm_work work; /* Must be first. */ 113 struct rb_node remote_qp_node; 114 struct rb_node remote_id_node; 115 __be64 remote_ca_guid; 116 __be32 remote_qpn; 117 u8 inserted_remote_qp; 118 u8 inserted_remote_id; 119}; 120 121struct cm_id_private { 122 struct ib_cm_id id; 123 124 struct rb_node service_node; 125 struct rb_node sidr_id_node; 126 spinlock_t lock; /* Do not acquire inside cm.lock */ 127 struct completion comp; 128 atomic_t refcount; 129 130 struct ib_mad_send_buf *msg; 131 struct cm_timewait_info *timewait_info; 132 /* todo: use alternate port on send failure */ 133 struct cm_av av; 134 struct cm_av alt_av; 135 struct ib_cm_compare_data *compare_data; 136 137 void *private_data; 138 __be64 tid; 139 __be32 local_qpn; 140 __be32 remote_qpn; 141 enum ib_qp_type qp_type; 142 __be32 sq_psn; 143 __be32 rq_psn; 144 int timeout_ms; 145 enum ib_mtu path_mtu; 146 u8 private_data_len; 147 u8 max_cm_retries; 148 u8 peer_to_peer; 149 u8 responder_resources; 150 u8 initiator_depth; 151 u8 local_ack_timeout; 152 u8 retry_count; 153 u8 rnr_retry_count; 154 u8 service_timeout; 155 156 struct list_head work_list; 157 atomic_t work_count; 158}; 159 160static void cm_work_handler(void *data); 161 162static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 163{ 164 if (atomic_dec_and_test(&cm_id_priv->refcount)) 165 complete(&cm_id_priv->comp); 166} 167 168static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 169 struct ib_mad_send_buf **msg) 170{ 171 struct ib_mad_agent *mad_agent; 172 struct ib_mad_send_buf *m; 173 struct ib_ah *ah; 174 175 mad_agent = cm_id_priv->av.port->mad_agent; 176 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 177 if (IS_ERR(ah)) 178 return PTR_ERR(ah); 179 180 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 181 cm_id_priv->av.pkey_index, 182 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 183 GFP_ATOMIC); 184 if (IS_ERR(m)) { 185 ib_destroy_ah(ah); 186 return PTR_ERR(m); 187 } 188 189 /* Timeout set by caller if response is expected. */ 190 m->ah = ah; 191 m->retries = cm_id_priv->max_cm_retries; 192 193 atomic_inc(&cm_id_priv->refcount); 194 m->context[0] = cm_id_priv; 195 *msg = m; 196 return 0; 197} 198 199static int cm_alloc_response_msg(struct cm_port *port, 200 struct ib_mad_recv_wc *mad_recv_wc, 201 struct ib_mad_send_buf **msg) 202{ 203 struct ib_mad_send_buf *m; 204 struct ib_ah *ah; 205 206 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 207 mad_recv_wc->recv_buf.grh, port->port_num); 208 if (IS_ERR(ah)) 209 return PTR_ERR(ah); 210 211 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 212 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 213 GFP_ATOMIC); 214 if (IS_ERR(m)) { 215 ib_destroy_ah(ah); 216 return PTR_ERR(m); 217 } 218 m->ah = ah; 219 *msg = m; 220 return 0; 221} 222 223static void cm_free_msg(struct ib_mad_send_buf *msg) 224{ 225 ib_destroy_ah(msg->ah); 226 if (msg->context[0]) 227 cm_deref_id(msg->context[0]); 228 ib_free_send_mad(msg); 229} 230 231static void * cm_copy_private_data(const void *private_data, 232 u8 private_data_len) 233{ 234 void *data; 235 236 if (!private_data || !private_data_len) 237 return NULL; 238 239 data = kmalloc(private_data_len, GFP_KERNEL); 240 if (!data) 241 return ERR_PTR(-ENOMEM); 242 243 memcpy(data, private_data, private_data_len); 244 return data; 245} 246 247static void cm_set_private_data(struct cm_id_private *cm_id_priv, 248 void *private_data, u8 private_data_len) 249{ 250 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 251 kfree(cm_id_priv->private_data); 252 253 cm_id_priv->private_data = private_data; 254 cm_id_priv->private_data_len = private_data_len; 255} 256 257static void cm_set_ah_attr(struct ib_ah_attr *ah_attr, u8 port_num, 258 u16 dlid, u8 sl, u16 src_path_bits) 259{ 260 memset(ah_attr, 0, sizeof ah_attr); 261 ah_attr->dlid = dlid; 262 ah_attr->sl = sl; 263 ah_attr->src_path_bits = src_path_bits; 264 ah_attr->port_num = port_num; 265} 266 267static void cm_init_av_for_response(struct cm_port *port, 268 struct ib_wc *wc, struct cm_av *av) 269{ 270 av->port = port; 271 av->pkey_index = wc->pkey_index; 272 cm_set_ah_attr(&av->ah_attr, port->port_num, wc->slid, 273 wc->sl, wc->dlid_path_bits); 274} 275 276static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 277{ 278 struct cm_device *cm_dev; 279 struct cm_port *port = NULL; 280 unsigned long flags; 281 int ret; 282 u8 p; 283 284 read_lock_irqsave(&cm.device_lock, flags); 285 list_for_each_entry(cm_dev, &cm.device_list, list) { 286 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 287 &p, NULL)) { 288 port = &cm_dev->port[p-1]; 289 break; 290 } 291 } 292 read_unlock_irqrestore(&cm.device_lock, flags); 293 294 if (!port) 295 return -EINVAL; 296 297 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 298 be16_to_cpu(path->pkey), &av->pkey_index); 299 if (ret) 300 return ret; 301 302 av->port = port; 303 cm_set_ah_attr(&av->ah_attr, av->port->port_num, 304 be16_to_cpu(path->dlid), path->sl, 305 be16_to_cpu(path->slid) & 0x7F); 306 av->packet_life_time = path->packet_life_time; 307 return 0; 308} 309 310static int cm_alloc_id(struct cm_id_private *cm_id_priv) 311{ 312 unsigned long flags; 313 int ret; 314 static int next_id; 315 316 do { 317 spin_lock_irqsave(&cm.lock, flags); 318 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, next_id++, 319 (__force int *) &cm_id_priv->id.local_id); 320 spin_unlock_irqrestore(&cm.lock, flags); 321 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 322 return ret; 323} 324 325static void cm_free_id(__be32 local_id) 326{ 327 unsigned long flags; 328 329 spin_lock_irqsave(&cm.lock, flags); 330 idr_remove(&cm.local_id_table, (__force int) local_id); 331 spin_unlock_irqrestore(&cm.lock, flags); 332} 333 334static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 335{ 336 struct cm_id_private *cm_id_priv; 337 338 cm_id_priv = idr_find(&cm.local_id_table, (__force int) local_id); 339 if (cm_id_priv) { 340 if (cm_id_priv->id.remote_id == remote_id) 341 atomic_inc(&cm_id_priv->refcount); 342 else 343 cm_id_priv = NULL; 344 } 345 346 return cm_id_priv; 347} 348 349static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 350{ 351 struct cm_id_private *cm_id_priv; 352 unsigned long flags; 353 354 spin_lock_irqsave(&cm.lock, flags); 355 cm_id_priv = cm_get_id(local_id, remote_id); 356 spin_unlock_irqrestore(&cm.lock, flags); 357 358 return cm_id_priv; 359} 360 361static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 362{ 363 int i; 364 365 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 366 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 367 ((unsigned long *) mask)[i]; 368} 369 370static int cm_compare_data(struct ib_cm_compare_data *src_data, 371 struct ib_cm_compare_data *dst_data) 372{ 373 u8 src[IB_CM_COMPARE_SIZE]; 374 u8 dst[IB_CM_COMPARE_SIZE]; 375 376 if (!src_data || !dst_data) 377 return 0; 378 379 cm_mask_copy(src, src_data->data, dst_data->mask); 380 cm_mask_copy(dst, dst_data->data, src_data->mask); 381 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 382} 383 384static int cm_compare_private_data(u8 *private_data, 385 struct ib_cm_compare_data *dst_data) 386{ 387 u8 src[IB_CM_COMPARE_SIZE]; 388 389 if (!dst_data) 390 return 0; 391 392 cm_mask_copy(src, private_data, dst_data->mask); 393 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 394} 395 396static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 397{ 398 struct rb_node **link = &cm.listen_service_table.rb_node; 399 struct rb_node *parent = NULL; 400 struct cm_id_private *cur_cm_id_priv; 401 __be64 service_id = cm_id_priv->id.service_id; 402 __be64 service_mask = cm_id_priv->id.service_mask; 403 int data_cmp; 404 405 while (*link) { 406 parent = *link; 407 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 408 service_node); 409 data_cmp = cm_compare_data(cm_id_priv->compare_data, 410 cur_cm_id_priv->compare_data); 411 if ((cur_cm_id_priv->id.service_mask & service_id) == 412 (service_mask & cur_cm_id_priv->id.service_id) && 413 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 414 !data_cmp) 415 return cur_cm_id_priv; 416 417 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 418 link = &(*link)->rb_left; 419 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 420 link = &(*link)->rb_right; 421 else if (service_id < cur_cm_id_priv->id.service_id) 422 link = &(*link)->rb_left; 423 else if (service_id > cur_cm_id_priv->id.service_id) 424 link = &(*link)->rb_right; 425 else if (data_cmp < 0) 426 link = &(*link)->rb_left; 427 else 428 link = &(*link)->rb_right; 429 } 430 rb_link_node(&cm_id_priv->service_node, parent, link); 431 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 432 return NULL; 433} 434 435static struct cm_id_private * cm_find_listen(struct ib_device *device, 436 __be64 service_id, 437 u8 *private_data) 438{ 439 struct rb_node *node = cm.listen_service_table.rb_node; 440 struct cm_id_private *cm_id_priv; 441 int data_cmp; 442 443 while (node) { 444 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 445 data_cmp = cm_compare_private_data(private_data, 446 cm_id_priv->compare_data); 447 if ((cm_id_priv->id.service_mask & service_id) == 448 cm_id_priv->id.service_id && 449 (cm_id_priv->id.device == device) && !data_cmp) 450 return cm_id_priv; 451 452 if (device < cm_id_priv->id.device) 453 node = node->rb_left; 454 else if (device > cm_id_priv->id.device) 455 node = node->rb_right; 456 else if (service_id < cm_id_priv->id.service_id) 457 node = node->rb_left; 458 else if (service_id > cm_id_priv->id.service_id) 459 node = node->rb_right; 460 else if (data_cmp < 0) 461 node = node->rb_left; 462 else 463 node = node->rb_right; 464 } 465 return NULL; 466} 467 468static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 469 *timewait_info) 470{ 471 struct rb_node **link = &cm.remote_id_table.rb_node; 472 struct rb_node *parent = NULL; 473 struct cm_timewait_info *cur_timewait_info; 474 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 475 __be32 remote_id = timewait_info->work.remote_id; 476 477 while (*link) { 478 parent = *link; 479 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 480 remote_id_node); 481 if (remote_id < cur_timewait_info->work.remote_id) 482 link = &(*link)->rb_left; 483 else if (remote_id > cur_timewait_info->work.remote_id) 484 link = &(*link)->rb_right; 485 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 486 link = &(*link)->rb_left; 487 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 488 link = &(*link)->rb_right; 489 else 490 return cur_timewait_info; 491 } 492 timewait_info->inserted_remote_id = 1; 493 rb_link_node(&timewait_info->remote_id_node, parent, link); 494 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 495 return NULL; 496} 497 498static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 499 __be32 remote_id) 500{ 501 struct rb_node *node = cm.remote_id_table.rb_node; 502 struct cm_timewait_info *timewait_info; 503 504 while (node) { 505 timewait_info = rb_entry(node, struct cm_timewait_info, 506 remote_id_node); 507 if (remote_id < timewait_info->work.remote_id) 508 node = node->rb_left; 509 else if (remote_id > timewait_info->work.remote_id) 510 node = node->rb_right; 511 else if (remote_ca_guid < timewait_info->remote_ca_guid) 512 node = node->rb_left; 513 else if (remote_ca_guid > timewait_info->remote_ca_guid) 514 node = node->rb_right; 515 else 516 return timewait_info; 517 } 518 return NULL; 519} 520 521static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 522 *timewait_info) 523{ 524 struct rb_node **link = &cm.remote_qp_table.rb_node; 525 struct rb_node *parent = NULL; 526 struct cm_timewait_info *cur_timewait_info; 527 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 528 __be32 remote_qpn = timewait_info->remote_qpn; 529 530 while (*link) { 531 parent = *link; 532 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 533 remote_qp_node); 534 if (remote_qpn < cur_timewait_info->remote_qpn) 535 link = &(*link)->rb_left; 536 else if (remote_qpn > cur_timewait_info->remote_qpn) 537 link = &(*link)->rb_right; 538 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 539 link = &(*link)->rb_left; 540 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 541 link = &(*link)->rb_right; 542 else 543 return cur_timewait_info; 544 } 545 timewait_info->inserted_remote_qp = 1; 546 rb_link_node(&timewait_info->remote_qp_node, parent, link); 547 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 548 return NULL; 549} 550 551static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 552 *cm_id_priv) 553{ 554 struct rb_node **link = &cm.remote_sidr_table.rb_node; 555 struct rb_node *parent = NULL; 556 struct cm_id_private *cur_cm_id_priv; 557 union ib_gid *port_gid = &cm_id_priv->av.dgid; 558 __be32 remote_id = cm_id_priv->id.remote_id; 559 560 while (*link) { 561 parent = *link; 562 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 563 sidr_id_node); 564 if (remote_id < cur_cm_id_priv->id.remote_id) 565 link = &(*link)->rb_left; 566 else if (remote_id > cur_cm_id_priv->id.remote_id) 567 link = &(*link)->rb_right; 568 else { 569 int cmp; 570 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 571 sizeof *port_gid); 572 if (cmp < 0) 573 link = &(*link)->rb_left; 574 else if (cmp > 0) 575 link = &(*link)->rb_right; 576 else 577 return cur_cm_id_priv; 578 } 579 } 580 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 581 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 582 return NULL; 583} 584 585static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 586 enum ib_cm_sidr_status status) 587{ 588 struct ib_cm_sidr_rep_param param; 589 590 memset(¶m, 0, sizeof param); 591 param.status = status; 592 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 593} 594 595struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 596 ib_cm_handler cm_handler, 597 void *context) 598{ 599 struct cm_id_private *cm_id_priv; 600 int ret; 601 602 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 603 if (!cm_id_priv) 604 return ERR_PTR(-ENOMEM); 605 606 cm_id_priv->id.state = IB_CM_IDLE; 607 cm_id_priv->id.device = device; 608 cm_id_priv->id.cm_handler = cm_handler; 609 cm_id_priv->id.context = context; 610 cm_id_priv->id.remote_cm_qpn = 1; 611 ret = cm_alloc_id(cm_id_priv); 612 if (ret) 613 goto error; 614 615 spin_lock_init(&cm_id_priv->lock); 616 init_completion(&cm_id_priv->comp); 617 INIT_LIST_HEAD(&cm_id_priv->work_list); 618 atomic_set(&cm_id_priv->work_count, -1); 619 atomic_set(&cm_id_priv->refcount, 1); 620 return &cm_id_priv->id; 621 622error: 623 kfree(cm_id_priv); 624 return ERR_PTR(-ENOMEM); 625} 626EXPORT_SYMBOL(ib_create_cm_id); 627 628static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 629{ 630 struct cm_work *work; 631 632 if (list_empty(&cm_id_priv->work_list)) 633 return NULL; 634 635 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 636 list_del(&work->list); 637 return work; 638} 639 640static void cm_free_work(struct cm_work *work) 641{ 642 if (work->mad_recv_wc) 643 ib_free_recv_mad(work->mad_recv_wc); 644 kfree(work); 645} 646 647static inline int cm_convert_to_ms(int iba_time) 648{ 649 /* approximate conversion to ms from 4.096us x 2^iba_time */ 650 return 1 << max(iba_time - 8, 0); 651} 652 653static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 654{ 655 unsigned long flags; 656 657 if (!timewait_info->inserted_remote_id && 658 !timewait_info->inserted_remote_qp) 659 return; 660 661 spin_lock_irqsave(&cm.lock, flags); 662 if (timewait_info->inserted_remote_id) { 663 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 664 timewait_info->inserted_remote_id = 0; 665 } 666 667 if (timewait_info->inserted_remote_qp) { 668 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 669 timewait_info->inserted_remote_qp = 0; 670 } 671 spin_unlock_irqrestore(&cm.lock, flags); 672} 673 674static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 675{ 676 struct cm_timewait_info *timewait_info; 677 678 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 679 if (!timewait_info) 680 return ERR_PTR(-ENOMEM); 681 682 timewait_info->work.local_id = local_id; 683 INIT_WORK(&timewait_info->work.work, cm_work_handler, 684 &timewait_info->work); 685 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 686 return timewait_info; 687} 688 689static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 690{ 691 int wait_time; 692 693 /* 694 * The cm_id could be destroyed by the user before we exit timewait. 695 * To protect against this, we search for the cm_id after exiting 696 * timewait before notifying the user that we've exited timewait. 697 */ 698 cm_id_priv->id.state = IB_CM_TIMEWAIT; 699 wait_time = cm_convert_to_ms(cm_id_priv->local_ack_timeout); 700 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 701 msecs_to_jiffies(wait_time)); 702 cm_id_priv->timewait_info = NULL; 703} 704 705static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 706{ 707 cm_id_priv->id.state = IB_CM_IDLE; 708 if (cm_id_priv->timewait_info) { 709 cm_cleanup_timewait(cm_id_priv->timewait_info); 710 kfree(cm_id_priv->timewait_info); 711 cm_id_priv->timewait_info = NULL; 712 } 713} 714 715void ib_destroy_cm_id(struct ib_cm_id *cm_id) 716{ 717 struct cm_id_private *cm_id_priv; 718 struct cm_work *work; 719 unsigned long flags; 720 721 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 722retest: 723 spin_lock_irqsave(&cm_id_priv->lock, flags); 724 switch (cm_id->state) { 725 case IB_CM_LISTEN: 726 cm_id->state = IB_CM_IDLE; 727 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 728 spin_lock_irqsave(&cm.lock, flags); 729 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 730 spin_unlock_irqrestore(&cm.lock, flags); 731 break; 732 case IB_CM_SIDR_REQ_SENT: 733 cm_id->state = IB_CM_IDLE; 734 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 735 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 736 break; 737 case IB_CM_SIDR_REQ_RCVD: 738 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 739 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 740 break; 741 case IB_CM_REQ_SENT: 742 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 743 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 744 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 745 &cm_id_priv->av.port->cm_dev->ca_guid, 746 sizeof cm_id_priv->av.port->cm_dev->ca_guid, 747 NULL, 0); 748 break; 749 case IB_CM_MRA_REQ_RCVD: 750 case IB_CM_REP_SENT: 751 case IB_CM_MRA_REP_RCVD: 752 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 753 /* Fall through */ 754 case IB_CM_REQ_RCVD: 755 case IB_CM_MRA_REQ_SENT: 756 case IB_CM_REP_RCVD: 757 case IB_CM_MRA_REP_SENT: 758 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 759 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 760 NULL, 0, NULL, 0); 761 break; 762 case IB_CM_ESTABLISHED: 763 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 764 ib_send_cm_dreq(cm_id, NULL, 0); 765 goto retest; 766 case IB_CM_DREQ_SENT: 767 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 768 cm_enter_timewait(cm_id_priv); 769 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 770 break; 771 case IB_CM_DREQ_RCVD: 772 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 773 ib_send_cm_drep(cm_id, NULL, 0); 774 break; 775 default: 776 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 777 break; 778 } 779 780 cm_free_id(cm_id->local_id); 781 cm_deref_id(cm_id_priv); 782 wait_for_completion(&cm_id_priv->comp); 783 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 784 cm_free_work(work); 785 kfree(cm_id_priv->compare_data); 786 kfree(cm_id_priv->private_data); 787 kfree(cm_id_priv); 788} 789EXPORT_SYMBOL(ib_destroy_cm_id); 790 791int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 792 struct ib_cm_compare_data *compare_data) 793{ 794 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 795 unsigned long flags; 796 int ret = 0; 797 798 service_mask = service_mask ? service_mask : 799 __constant_cpu_to_be64(~0ULL); 800 service_id &= service_mask; 801 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 802 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 803 return -EINVAL; 804 805 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 806 if (cm_id->state != IB_CM_IDLE) 807 return -EINVAL; 808 809 if (compare_data) { 810 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 811 GFP_KERNEL); 812 if (!cm_id_priv->compare_data) 813 return -ENOMEM; 814 cm_mask_copy(cm_id_priv->compare_data->data, 815 compare_data->data, compare_data->mask); 816 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 817 IB_CM_COMPARE_SIZE); 818 } 819 820 cm_id->state = IB_CM_LISTEN; 821 822 spin_lock_irqsave(&cm.lock, flags); 823 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 824 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 825 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 826 } else { 827 cm_id->service_id = service_id; 828 cm_id->service_mask = service_mask; 829 } 830 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 831 spin_unlock_irqrestore(&cm.lock, flags); 832 833 if (cur_cm_id_priv) { 834 cm_id->state = IB_CM_IDLE; 835 kfree(cm_id_priv->compare_data); 836 cm_id_priv->compare_data = NULL; 837 ret = -EBUSY; 838 } 839 return ret; 840} 841EXPORT_SYMBOL(ib_cm_listen); 842 843static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 844 enum cm_msg_sequence msg_seq) 845{ 846 u64 hi_tid, low_tid; 847 848 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 849 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 850 (msg_seq << 30)); 851 return cpu_to_be64(hi_tid | low_tid); 852} 853 854static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 855 __be16 attr_id, __be64 tid) 856{ 857 hdr->base_version = IB_MGMT_BASE_VERSION; 858 hdr->mgmt_class = IB_MGMT_CLASS_CM; 859 hdr->class_version = IB_CM_CLASS_VERSION; 860 hdr->method = IB_MGMT_METHOD_SEND; 861 hdr->attr_id = attr_id; 862 hdr->tid = tid; 863} 864 865static void cm_format_req(struct cm_req_msg *req_msg, 866 struct cm_id_private *cm_id_priv, 867 struct ib_cm_req_param *param) 868{ 869 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 870 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 871 872 req_msg->local_comm_id = cm_id_priv->id.local_id; 873 req_msg->service_id = param->service_id; 874 req_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 875 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 876 cm_req_set_resp_res(req_msg, param->responder_resources); 877 cm_req_set_init_depth(req_msg, param->initiator_depth); 878 cm_req_set_remote_resp_timeout(req_msg, 879 param->remote_cm_response_timeout); 880 cm_req_set_qp_type(req_msg, param->qp_type); 881 cm_req_set_flow_ctrl(req_msg, param->flow_control); 882 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 883 cm_req_set_local_resp_timeout(req_msg, 884 param->local_cm_response_timeout); 885 cm_req_set_retry_count(req_msg, param->retry_count); 886 req_msg->pkey = param->primary_path->pkey; 887 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 888 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 889 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 890 cm_req_set_srq(req_msg, param->srq); 891 892 req_msg->primary_local_lid = param->primary_path->slid; 893 req_msg->primary_remote_lid = param->primary_path->dlid; 894 req_msg->primary_local_gid = param->primary_path->sgid; 895 req_msg->primary_remote_gid = param->primary_path->dgid; 896 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 897 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 898 req_msg->primary_traffic_class = param->primary_path->traffic_class; 899 req_msg->primary_hop_limit = param->primary_path->hop_limit; 900 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 901 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 902 cm_req_set_primary_local_ack_timeout(req_msg, 903 min(31, param->primary_path->packet_life_time + 1)); 904 905 if (param->alternate_path) { 906 req_msg->alt_local_lid = param->alternate_path->slid; 907 req_msg->alt_remote_lid = param->alternate_path->dlid; 908 req_msg->alt_local_gid = param->alternate_path->sgid; 909 req_msg->alt_remote_gid = param->alternate_path->dgid; 910 cm_req_set_alt_flow_label(req_msg, 911 param->alternate_path->flow_label); 912 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 913 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 914 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 915 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 916 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 917 cm_req_set_alt_local_ack_timeout(req_msg, 918 min(31, param->alternate_path->packet_life_time + 1)); 919 } 920 921 if (param->private_data && param->private_data_len) 922 memcpy(req_msg->private_data, param->private_data, 923 param->private_data_len); 924} 925 926static int cm_validate_req_param(struct ib_cm_req_param *param) 927{ 928 /* peer-to-peer not supported */ 929 if (param->peer_to_peer) 930 return -EINVAL; 931 932 if (!param->primary_path) 933 return -EINVAL; 934 935 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 936 return -EINVAL; 937 938 if (param->private_data && 939 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 940 return -EINVAL; 941 942 if (param->alternate_path && 943 (param->alternate_path->pkey != param->primary_path->pkey || 944 param->alternate_path->mtu != param->primary_path->mtu)) 945 return -EINVAL; 946 947 return 0; 948} 949 950int ib_send_cm_req(struct ib_cm_id *cm_id, 951 struct ib_cm_req_param *param) 952{ 953 struct cm_id_private *cm_id_priv; 954 struct cm_req_msg *req_msg; 955 unsigned long flags; 956 int ret; 957 958 ret = cm_validate_req_param(param); 959 if (ret) 960 return ret; 961 962 /* Verify that we're not in timewait. */ 963 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 964 spin_lock_irqsave(&cm_id_priv->lock, flags); 965 if (cm_id->state != IB_CM_IDLE) { 966 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 967 ret = -EINVAL; 968 goto out; 969 } 970 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 971 972 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 973 id.local_id); 974 if (IS_ERR(cm_id_priv->timewait_info)) 975 goto out; 976 977 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 978 if (ret) 979 goto error1; 980 if (param->alternate_path) { 981 ret = cm_init_av_by_path(param->alternate_path, 982 &cm_id_priv->alt_av); 983 if (ret) 984 goto error1; 985 } 986 cm_id->service_id = param->service_id; 987 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 988 cm_id_priv->timeout_ms = cm_convert_to_ms( 989 param->primary_path->packet_life_time) * 2 + 990 cm_convert_to_ms( 991 param->remote_cm_response_timeout); 992 cm_id_priv->max_cm_retries = param->max_cm_retries; 993 cm_id_priv->initiator_depth = param->initiator_depth; 994 cm_id_priv->responder_resources = param->responder_resources; 995 cm_id_priv->retry_count = param->retry_count; 996 cm_id_priv->path_mtu = param->primary_path->mtu; 997 cm_id_priv->qp_type = param->qp_type; 998 999 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1000 if (ret) 1001 goto error1; 1002 1003 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1004 cm_format_req(req_msg, cm_id_priv, param); 1005 cm_id_priv->tid = req_msg->hdr.tid; 1006 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1007 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1008 1009 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1010 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1011 cm_id_priv->local_ack_timeout = 1012 cm_req_get_primary_local_ack_timeout(req_msg); 1013 1014 spin_lock_irqsave(&cm_id_priv->lock, flags); 1015 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1016 if (ret) { 1017 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1018 goto error2; 1019 } 1020 BUG_ON(cm_id->state != IB_CM_IDLE); 1021 cm_id->state = IB_CM_REQ_SENT; 1022 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1023 return 0; 1024 1025error2: cm_free_msg(cm_id_priv->msg); 1026error1: kfree(cm_id_priv->timewait_info); 1027out: return ret; 1028} 1029EXPORT_SYMBOL(ib_send_cm_req); 1030 1031static int cm_issue_rej(struct cm_port *port, 1032 struct ib_mad_recv_wc *mad_recv_wc, 1033 enum ib_cm_rej_reason reason, 1034 enum cm_msg_response msg_rejected, 1035 void *ari, u8 ari_length) 1036{ 1037 struct ib_mad_send_buf *msg = NULL; 1038 struct cm_rej_msg *rej_msg, *rcv_msg; 1039 int ret; 1040 1041 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1042 if (ret) 1043 return ret; 1044 1045 /* We just need common CM header information. Cast to any message. */ 1046 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1047 rej_msg = (struct cm_rej_msg *) msg->mad; 1048 1049 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1050 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1051 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1052 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1053 rej_msg->reason = cpu_to_be16(reason); 1054 1055 if (ari && ari_length) { 1056 cm_rej_set_reject_info_len(rej_msg, ari_length); 1057 memcpy(rej_msg->ari, ari, ari_length); 1058 } 1059 1060 ret = ib_post_send_mad(msg, NULL); 1061 if (ret) 1062 cm_free_msg(msg); 1063 1064 return ret; 1065} 1066 1067static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1068 __be32 local_qpn, __be32 remote_qpn) 1069{ 1070 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1071 ((local_ca_guid == remote_ca_guid) && 1072 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1073} 1074 1075static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1076 struct ib_sa_path_rec *primary_path, 1077 struct ib_sa_path_rec *alt_path) 1078{ 1079 memset(primary_path, 0, sizeof *primary_path); 1080 primary_path->dgid = req_msg->primary_local_gid; 1081 primary_path->sgid = req_msg->primary_remote_gid; 1082 primary_path->dlid = req_msg->primary_local_lid; 1083 primary_path->slid = req_msg->primary_remote_lid; 1084 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1085 primary_path->hop_limit = req_msg->primary_hop_limit; 1086 primary_path->traffic_class = req_msg->primary_traffic_class; 1087 primary_path->reversible = 1; 1088 primary_path->pkey = req_msg->pkey; 1089 primary_path->sl = cm_req_get_primary_sl(req_msg); 1090 primary_path->mtu_selector = IB_SA_EQ; 1091 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1092 primary_path->rate_selector = IB_SA_EQ; 1093 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1094 primary_path->packet_life_time_selector = IB_SA_EQ; 1095 primary_path->packet_life_time = 1096 cm_req_get_primary_local_ack_timeout(req_msg); 1097 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1098 1099 if (req_msg->alt_local_lid) { 1100 memset(alt_path, 0, sizeof *alt_path); 1101 alt_path->dgid = req_msg->alt_local_gid; 1102 alt_path->sgid = req_msg->alt_remote_gid; 1103 alt_path->dlid = req_msg->alt_local_lid; 1104 alt_path->slid = req_msg->alt_remote_lid; 1105 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1106 alt_path->hop_limit = req_msg->alt_hop_limit; 1107 alt_path->traffic_class = req_msg->alt_traffic_class; 1108 alt_path->reversible = 1; 1109 alt_path->pkey = req_msg->pkey; 1110 alt_path->sl = cm_req_get_alt_sl(req_msg); 1111 alt_path->mtu_selector = IB_SA_EQ; 1112 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1113 alt_path->rate_selector = IB_SA_EQ; 1114 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1115 alt_path->packet_life_time_selector = IB_SA_EQ; 1116 alt_path->packet_life_time = 1117 cm_req_get_alt_local_ack_timeout(req_msg); 1118 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1119 } 1120} 1121 1122static void cm_format_req_event(struct cm_work *work, 1123 struct cm_id_private *cm_id_priv, 1124 struct ib_cm_id *listen_id) 1125{ 1126 struct cm_req_msg *req_msg; 1127 struct ib_cm_req_event_param *param; 1128 1129 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1130 param = &work->cm_event.param.req_rcvd; 1131 param->listen_id = listen_id; 1132 param->port = cm_id_priv->av.port->port_num; 1133 param->primary_path = &work->path[0]; 1134 if (req_msg->alt_local_lid) 1135 param->alternate_path = &work->path[1]; 1136 else 1137 param->alternate_path = NULL; 1138 param->remote_ca_guid = req_msg->local_ca_guid; 1139 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1140 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1141 param->qp_type = cm_req_get_qp_type(req_msg); 1142 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1143 param->responder_resources = cm_req_get_init_depth(req_msg); 1144 param->initiator_depth = cm_req_get_resp_res(req_msg); 1145 param->local_cm_response_timeout = 1146 cm_req_get_remote_resp_timeout(req_msg); 1147 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1148 param->remote_cm_response_timeout = 1149 cm_req_get_local_resp_timeout(req_msg); 1150 param->retry_count = cm_req_get_retry_count(req_msg); 1151 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1152 param->srq = cm_req_get_srq(req_msg); 1153 work->cm_event.private_data = &req_msg->private_data; 1154} 1155 1156static void cm_process_work(struct cm_id_private *cm_id_priv, 1157 struct cm_work *work) 1158{ 1159 unsigned long flags; 1160 int ret; 1161 1162 /* We will typically only have the current event to report. */ 1163 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1164 cm_free_work(work); 1165 1166 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1167 spin_lock_irqsave(&cm_id_priv->lock, flags); 1168 work = cm_dequeue_work(cm_id_priv); 1169 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1170 BUG_ON(!work); 1171 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1172 &work->cm_event); 1173 cm_free_work(work); 1174 } 1175 cm_deref_id(cm_id_priv); 1176 if (ret) 1177 ib_destroy_cm_id(&cm_id_priv->id); 1178} 1179 1180static void cm_format_mra(struct cm_mra_msg *mra_msg, 1181 struct cm_id_private *cm_id_priv, 1182 enum cm_msg_response msg_mraed, u8 service_timeout, 1183 const void *private_data, u8 private_data_len) 1184{ 1185 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1186 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1187 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1188 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1189 cm_mra_set_service_timeout(mra_msg, service_timeout); 1190 1191 if (private_data && private_data_len) 1192 memcpy(mra_msg->private_data, private_data, private_data_len); 1193} 1194 1195static void cm_format_rej(struct cm_rej_msg *rej_msg, 1196 struct cm_id_private *cm_id_priv, 1197 enum ib_cm_rej_reason reason, 1198 void *ari, 1199 u8 ari_length, 1200 const void *private_data, 1201 u8 private_data_len) 1202{ 1203 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1204 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1205 1206 switch(cm_id_priv->id.state) { 1207 case IB_CM_REQ_RCVD: 1208 rej_msg->local_comm_id = 0; 1209 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1210 break; 1211 case IB_CM_MRA_REQ_SENT: 1212 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1213 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1214 break; 1215 case IB_CM_REP_RCVD: 1216 case IB_CM_MRA_REP_SENT: 1217 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1218 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1219 break; 1220 default: 1221 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1222 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1223 break; 1224 } 1225 1226 rej_msg->reason = cpu_to_be16(reason); 1227 if (ari && ari_length) { 1228 cm_rej_set_reject_info_len(rej_msg, ari_length); 1229 memcpy(rej_msg->ari, ari, ari_length); 1230 } 1231 1232 if (private_data && private_data_len) 1233 memcpy(rej_msg->private_data, private_data, private_data_len); 1234} 1235 1236static void cm_dup_req_handler(struct cm_work *work, 1237 struct cm_id_private *cm_id_priv) 1238{ 1239 struct ib_mad_send_buf *msg = NULL; 1240 unsigned long flags; 1241 int ret; 1242 1243 /* Quick state check to discard duplicate REQs. */ 1244 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1245 return; 1246 1247 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1248 if (ret) 1249 return; 1250 1251 spin_lock_irqsave(&cm_id_priv->lock, flags); 1252 switch (cm_id_priv->id.state) { 1253 case IB_CM_MRA_REQ_SENT: 1254 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1255 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1256 cm_id_priv->private_data, 1257 cm_id_priv->private_data_len); 1258 break; 1259 case IB_CM_TIMEWAIT: 1260 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1261 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1262 break; 1263 default: 1264 goto unlock; 1265 } 1266 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1267 1268 ret = ib_post_send_mad(msg, NULL); 1269 if (ret) 1270 goto free; 1271 return; 1272 1273unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1274free: cm_free_msg(msg); 1275} 1276 1277static struct cm_id_private * cm_match_req(struct cm_work *work, 1278 struct cm_id_private *cm_id_priv) 1279{ 1280 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1281 struct cm_timewait_info *timewait_info; 1282 struct cm_req_msg *req_msg; 1283 unsigned long flags; 1284 1285 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1286 1287 /* Check for duplicate REQ and stale connections. */ 1288 spin_lock_irqsave(&cm.lock, flags); 1289 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1290 if (!timewait_info) 1291 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1292 1293 if (timewait_info) { 1294 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1295 timewait_info->work.remote_id); 1296 spin_unlock_irqrestore(&cm.lock, flags); 1297 if (cur_cm_id_priv) { 1298 cm_dup_req_handler(work, cur_cm_id_priv); 1299 cm_deref_id(cur_cm_id_priv); 1300 } else 1301 cm_issue_rej(work->port, work->mad_recv_wc, 1302 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1303 NULL, 0); 1304 goto error; 1305 } 1306 1307 /* Find matching listen request. */ 1308 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1309 req_msg->service_id, 1310 req_msg->private_data); 1311 if (!listen_cm_id_priv) { 1312 spin_unlock_irqrestore(&cm.lock, flags); 1313 cm_issue_rej(work->port, work->mad_recv_wc, 1314 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1315 NULL, 0); 1316 goto error; 1317 } 1318 atomic_inc(&listen_cm_id_priv->refcount); 1319 atomic_inc(&cm_id_priv->refcount); 1320 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1321 atomic_inc(&cm_id_priv->work_count); 1322 spin_unlock_irqrestore(&cm.lock, flags); 1323 return listen_cm_id_priv; 1324 1325error: cm_cleanup_timewait(cm_id_priv->timewait_info); 1326 return NULL; 1327} 1328 1329static int cm_req_handler(struct cm_work *work) 1330{ 1331 struct ib_cm_id *cm_id; 1332 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1333 struct cm_req_msg *req_msg; 1334 int ret; 1335 1336 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1337 1338 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1339 if (IS_ERR(cm_id)) 1340 return PTR_ERR(cm_id); 1341 1342 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1343 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1344 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1345 &cm_id_priv->av); 1346 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1347 id.local_id); 1348 if (IS_ERR(cm_id_priv->timewait_info)) { 1349 ret = PTR_ERR(cm_id_priv->timewait_info); 1350 goto error1; 1351 } 1352 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1353 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1354 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1355 1356 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1357 if (!listen_cm_id_priv) { 1358 ret = -EINVAL; 1359 goto error2; 1360 } 1361 1362 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1363 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1364 cm_id_priv->id.service_id = req_msg->service_id; 1365 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1366 1367 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1368 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1369 if (ret) 1370 goto error3; 1371 if (req_msg->alt_local_lid) { 1372 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1373 if (ret) 1374 goto error3; 1375 } 1376 cm_id_priv->tid = req_msg->hdr.tid; 1377 cm_id_priv->timeout_ms = cm_convert_to_ms( 1378 cm_req_get_local_resp_timeout(req_msg)); 1379 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1380 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1381 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1382 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1383 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1384 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1385 cm_id_priv->local_ack_timeout = 1386 cm_req_get_primary_local_ack_timeout(req_msg); 1387 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1388 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1389 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1390 1391 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1392 cm_process_work(cm_id_priv, work); 1393 cm_deref_id(listen_cm_id_priv); 1394 return 0; 1395 1396error3: atomic_dec(&cm_id_priv->refcount); 1397 cm_deref_id(listen_cm_id_priv); 1398 cm_cleanup_timewait(cm_id_priv->timewait_info); 1399error2: kfree(cm_id_priv->timewait_info); 1400 cm_id_priv->timewait_info = NULL; 1401error1: ib_destroy_cm_id(&cm_id_priv->id); 1402 return ret; 1403} 1404 1405static void cm_format_rep(struct cm_rep_msg *rep_msg, 1406 struct cm_id_private *cm_id_priv, 1407 struct ib_cm_rep_param *param) 1408{ 1409 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1410 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1411 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1412 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1413 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1414 rep_msg->resp_resources = param->responder_resources; 1415 rep_msg->initiator_depth = param->initiator_depth; 1416 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay); 1417 cm_rep_set_failover(rep_msg, param->failover_accepted); 1418 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1419 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1420 cm_rep_set_srq(rep_msg, param->srq); 1421 rep_msg->local_ca_guid = cm_id_priv->av.port->cm_dev->ca_guid; 1422 1423 if (param->private_data && param->private_data_len) 1424 memcpy(rep_msg->private_data, param->private_data, 1425 param->private_data_len); 1426} 1427 1428int ib_send_cm_rep(struct ib_cm_id *cm_id, 1429 struct ib_cm_rep_param *param) 1430{ 1431 struct cm_id_private *cm_id_priv; 1432 struct ib_mad_send_buf *msg; 1433 struct cm_rep_msg *rep_msg; 1434 unsigned long flags; 1435 int ret; 1436 1437 if (param->private_data && 1438 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1439 return -EINVAL; 1440 1441 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1442 spin_lock_irqsave(&cm_id_priv->lock, flags); 1443 if (cm_id->state != IB_CM_REQ_RCVD && 1444 cm_id->state != IB_CM_MRA_REQ_SENT) { 1445 ret = -EINVAL; 1446 goto out; 1447 } 1448 1449 ret = cm_alloc_msg(cm_id_priv, &msg); 1450 if (ret) 1451 goto out; 1452 1453 rep_msg = (struct cm_rep_msg *) msg->mad; 1454 cm_format_rep(rep_msg, cm_id_priv, param); 1455 msg->timeout_ms = cm_id_priv->timeout_ms; 1456 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1457 1458 ret = ib_post_send_mad(msg, NULL); 1459 if (ret) { 1460 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1461 cm_free_msg(msg); 1462 return ret; 1463 } 1464 1465 cm_id->state = IB_CM_REP_SENT; 1466 cm_id_priv->msg = msg; 1467 cm_id_priv->initiator_depth = param->initiator_depth; 1468 cm_id_priv->responder_resources = param->responder_resources; 1469 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1470 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1471 1472out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1473 return ret; 1474} 1475EXPORT_SYMBOL(ib_send_cm_rep); 1476 1477static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1478 struct cm_id_private *cm_id_priv, 1479 const void *private_data, 1480 u8 private_data_len) 1481{ 1482 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1483 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1484 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1485 1486 if (private_data && private_data_len) 1487 memcpy(rtu_msg->private_data, private_data, private_data_len); 1488} 1489 1490int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1491 const void *private_data, 1492 u8 private_data_len) 1493{ 1494 struct cm_id_private *cm_id_priv; 1495 struct ib_mad_send_buf *msg; 1496 unsigned long flags; 1497 void *data; 1498 int ret; 1499 1500 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1501 return -EINVAL; 1502 1503 data = cm_copy_private_data(private_data, private_data_len); 1504 if (IS_ERR(data)) 1505 return PTR_ERR(data); 1506 1507 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1508 spin_lock_irqsave(&cm_id_priv->lock, flags); 1509 if (cm_id->state != IB_CM_REP_RCVD && 1510 cm_id->state != IB_CM_MRA_REP_SENT) { 1511 ret = -EINVAL; 1512 goto error; 1513 } 1514 1515 ret = cm_alloc_msg(cm_id_priv, &msg); 1516 if (ret) 1517 goto error; 1518 1519 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1520 private_data, private_data_len); 1521 1522 ret = ib_post_send_mad(msg, NULL); 1523 if (ret) { 1524 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1525 cm_free_msg(msg); 1526 kfree(data); 1527 return ret; 1528 } 1529 1530 cm_id->state = IB_CM_ESTABLISHED; 1531 cm_set_private_data(cm_id_priv, data, private_data_len); 1532 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1533 return 0; 1534 1535error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1536 kfree(data); 1537 return ret; 1538} 1539EXPORT_SYMBOL(ib_send_cm_rtu); 1540 1541static void cm_format_rep_event(struct cm_work *work) 1542{ 1543 struct cm_rep_msg *rep_msg; 1544 struct ib_cm_rep_event_param *param; 1545 1546 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1547 param = &work->cm_event.param.rep_rcvd; 1548 param->remote_ca_guid = rep_msg->local_ca_guid; 1549 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1550 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1551 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1552 param->responder_resources = rep_msg->initiator_depth; 1553 param->initiator_depth = rep_msg->resp_resources; 1554 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1555 param->failover_accepted = cm_rep_get_failover(rep_msg); 1556 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1557 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1558 param->srq = cm_rep_get_srq(rep_msg); 1559 work->cm_event.private_data = &rep_msg->private_data; 1560} 1561 1562static void cm_dup_rep_handler(struct cm_work *work) 1563{ 1564 struct cm_id_private *cm_id_priv; 1565 struct cm_rep_msg *rep_msg; 1566 struct ib_mad_send_buf *msg = NULL; 1567 unsigned long flags; 1568 int ret; 1569 1570 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1571 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1572 rep_msg->local_comm_id); 1573 if (!cm_id_priv) 1574 return; 1575 1576 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1577 if (ret) 1578 goto deref; 1579 1580 spin_lock_irqsave(&cm_id_priv->lock, flags); 1581 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1582 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1583 cm_id_priv->private_data, 1584 cm_id_priv->private_data_len); 1585 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1586 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1587 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1588 cm_id_priv->private_data, 1589 cm_id_priv->private_data_len); 1590 else 1591 goto unlock; 1592 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1593 1594 ret = ib_post_send_mad(msg, NULL); 1595 if (ret) 1596 goto free; 1597 goto deref; 1598 1599unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1600free: cm_free_msg(msg); 1601deref: cm_deref_id(cm_id_priv); 1602} 1603 1604static int cm_rep_handler(struct cm_work *work) 1605{ 1606 struct cm_id_private *cm_id_priv; 1607 struct cm_rep_msg *rep_msg; 1608 unsigned long flags; 1609 int ret; 1610 1611 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1612 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1613 if (!cm_id_priv) { 1614 cm_dup_rep_handler(work); 1615 return -EINVAL; 1616 } 1617 1618 cm_format_rep_event(work); 1619 1620 spin_lock_irqsave(&cm_id_priv->lock, flags); 1621 switch (cm_id_priv->id.state) { 1622 case IB_CM_REQ_SENT: 1623 case IB_CM_MRA_REQ_RCVD: 1624 break; 1625 default: 1626 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1627 ret = -EINVAL; 1628 goto error; 1629 } 1630 1631 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1632 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1633 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1634 1635 spin_lock(&cm.lock); 1636 /* Check for duplicate REP. */ 1637 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1638 spin_unlock(&cm.lock); 1639 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1640 ret = -EINVAL; 1641 goto error; 1642 } 1643 /* Check for a stale connection. */ 1644 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1645 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1646 &cm.remote_id_table); 1647 cm_id_priv->timewait_info->inserted_remote_id = 0; 1648 spin_unlock(&cm.lock); 1649 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1650 cm_issue_rej(work->port, work->mad_recv_wc, 1651 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1652 NULL, 0); 1653 ret = -EINVAL; 1654 goto error; 1655 } 1656 spin_unlock(&cm.lock); 1657 1658 cm_id_priv->id.state = IB_CM_REP_RCVD; 1659 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1660 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1661 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1662 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1663 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1664 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1665 1666 /* todo: handle peer_to_peer */ 1667 1668 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1669 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1670 if (!ret) 1671 list_add_tail(&work->list, &cm_id_priv->work_list); 1672 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1673 1674 if (ret) 1675 cm_process_work(cm_id_priv, work); 1676 else 1677 cm_deref_id(cm_id_priv); 1678 return 0; 1679 1680error: 1681 cm_deref_id(cm_id_priv); 1682 return ret; 1683} 1684 1685static int cm_establish_handler(struct cm_work *work) 1686{ 1687 struct cm_id_private *cm_id_priv; 1688 unsigned long flags; 1689 int ret; 1690 1691 /* See comment in ib_cm_establish about lookup. */ 1692 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1693 if (!cm_id_priv) 1694 return -EINVAL; 1695 1696 spin_lock_irqsave(&cm_id_priv->lock, flags); 1697 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1698 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1699 goto out; 1700 } 1701 1702 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1703 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1704 if (!ret) 1705 list_add_tail(&work->list, &cm_id_priv->work_list); 1706 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1707 1708 if (ret) 1709 cm_process_work(cm_id_priv, work); 1710 else 1711 cm_deref_id(cm_id_priv); 1712 return 0; 1713out: 1714 cm_deref_id(cm_id_priv); 1715 return -EINVAL; 1716} 1717 1718static int cm_rtu_handler(struct cm_work *work) 1719{ 1720 struct cm_id_private *cm_id_priv; 1721 struct cm_rtu_msg *rtu_msg; 1722 unsigned long flags; 1723 int ret; 1724 1725 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1726 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1727 rtu_msg->local_comm_id); 1728 if (!cm_id_priv) 1729 return -EINVAL; 1730 1731 work->cm_event.private_data = &rtu_msg->private_data; 1732 1733 spin_lock_irqsave(&cm_id_priv->lock, flags); 1734 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1735 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1736 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1737 goto out; 1738 } 1739 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1740 1741 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1742 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1743 if (!ret) 1744 list_add_tail(&work->list, &cm_id_priv->work_list); 1745 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1746 1747 if (ret) 1748 cm_process_work(cm_id_priv, work); 1749 else 1750 cm_deref_id(cm_id_priv); 1751 return 0; 1752out: 1753 cm_deref_id(cm_id_priv); 1754 return -EINVAL; 1755} 1756 1757static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1758 struct cm_id_private *cm_id_priv, 1759 const void *private_data, 1760 u8 private_data_len) 1761{ 1762 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1763 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1764 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1765 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1766 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1767 1768 if (private_data && private_data_len) 1769 memcpy(dreq_msg->private_data, private_data, private_data_len); 1770} 1771 1772int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1773 const void *private_data, 1774 u8 private_data_len) 1775{ 1776 struct cm_id_private *cm_id_priv; 1777 struct ib_mad_send_buf *msg; 1778 unsigned long flags; 1779 int ret; 1780 1781 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1782 return -EINVAL; 1783 1784 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1785 spin_lock_irqsave(&cm_id_priv->lock, flags); 1786 if (cm_id->state != IB_CM_ESTABLISHED) { 1787 ret = -EINVAL; 1788 goto out; 1789 } 1790 1791 ret = cm_alloc_msg(cm_id_priv, &msg); 1792 if (ret) { 1793 cm_enter_timewait(cm_id_priv); 1794 goto out; 1795 } 1796 1797 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1798 private_data, private_data_len); 1799 msg->timeout_ms = cm_id_priv->timeout_ms; 1800 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1801 1802 ret = ib_post_send_mad(msg, NULL); 1803 if (ret) { 1804 cm_enter_timewait(cm_id_priv); 1805 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1806 cm_free_msg(msg); 1807 return ret; 1808 } 1809 1810 cm_id->state = IB_CM_DREQ_SENT; 1811 cm_id_priv->msg = msg; 1812out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1813 return ret; 1814} 1815EXPORT_SYMBOL(ib_send_cm_dreq); 1816 1817static void cm_format_drep(struct cm_drep_msg *drep_msg, 1818 struct cm_id_private *cm_id_priv, 1819 const void *private_data, 1820 u8 private_data_len) 1821{ 1822 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1823 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1824 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1825 1826 if (private_data && private_data_len) 1827 memcpy(drep_msg->private_data, private_data, private_data_len); 1828} 1829 1830int ib_send_cm_drep(struct ib_cm_id *cm_id, 1831 const void *private_data, 1832 u8 private_data_len) 1833{ 1834 struct cm_id_private *cm_id_priv; 1835 struct ib_mad_send_buf *msg; 1836 unsigned long flags; 1837 void *data; 1838 int ret; 1839 1840 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1841 return -EINVAL; 1842 1843 data = cm_copy_private_data(private_data, private_data_len); 1844 if (IS_ERR(data)) 1845 return PTR_ERR(data); 1846 1847 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1848 spin_lock_irqsave(&cm_id_priv->lock, flags); 1849 if (cm_id->state != IB_CM_DREQ_RCVD) { 1850 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1851 kfree(data); 1852 return -EINVAL; 1853 } 1854 1855 cm_set_private_data(cm_id_priv, data, private_data_len); 1856 cm_enter_timewait(cm_id_priv); 1857 1858 ret = cm_alloc_msg(cm_id_priv, &msg); 1859 if (ret) 1860 goto out; 1861 1862 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1863 private_data, private_data_len); 1864 1865 ret = ib_post_send_mad(msg, NULL); 1866 if (ret) { 1867 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1868 cm_free_msg(msg); 1869 return ret; 1870 } 1871 1872out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1873 return ret; 1874} 1875EXPORT_SYMBOL(ib_send_cm_drep); 1876 1877static int cm_dreq_handler(struct cm_work *work) 1878{ 1879 struct cm_id_private *cm_id_priv; 1880 struct cm_dreq_msg *dreq_msg; 1881 struct ib_mad_send_buf *msg = NULL; 1882 unsigned long flags; 1883 int ret; 1884 1885 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 1886 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 1887 dreq_msg->local_comm_id); 1888 if (!cm_id_priv) 1889 return -EINVAL; 1890 1891 work->cm_event.private_data = &dreq_msg->private_data; 1892 1893 spin_lock_irqsave(&cm_id_priv->lock, flags); 1894 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 1895 goto unlock; 1896 1897 switch (cm_id_priv->id.state) { 1898 case IB_CM_REP_SENT: 1899 case IB_CM_DREQ_SENT: 1900 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1901 break; 1902 case IB_CM_ESTABLISHED: 1903 case IB_CM_MRA_REP_RCVD: 1904 break; 1905 case IB_CM_TIMEWAIT: 1906 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 1907 goto unlock; 1908 1909 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1910 cm_id_priv->private_data, 1911 cm_id_priv->private_data_len); 1912 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1913 1914 if (ib_post_send_mad(msg, NULL)) 1915 cm_free_msg(msg); 1916 goto deref; 1917 default: 1918 goto unlock; 1919 } 1920 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 1921 cm_id_priv->tid = dreq_msg->hdr.tid; 1922 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1923 if (!ret) 1924 list_add_tail(&work->list, &cm_id_priv->work_list); 1925 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1926 1927 if (ret) 1928 cm_process_work(cm_id_priv, work); 1929 else 1930 cm_deref_id(cm_id_priv); 1931 return 0; 1932 1933unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1934deref: cm_deref_id(cm_id_priv); 1935 return -EINVAL; 1936} 1937 1938static int cm_drep_handler(struct cm_work *work) 1939{ 1940 struct cm_id_private *cm_id_priv; 1941 struct cm_drep_msg *drep_msg; 1942 unsigned long flags; 1943 int ret; 1944 1945 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 1946 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 1947 drep_msg->local_comm_id); 1948 if (!cm_id_priv) 1949 return -EINVAL; 1950 1951 work->cm_event.private_data = &drep_msg->private_data; 1952 1953 spin_lock_irqsave(&cm_id_priv->lock, flags); 1954 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 1955 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 1956 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1957 goto out; 1958 } 1959 cm_enter_timewait(cm_id_priv); 1960 1961 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1962 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1963 if (!ret) 1964 list_add_tail(&work->list, &cm_id_priv->work_list); 1965 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1966 1967 if (ret) 1968 cm_process_work(cm_id_priv, work); 1969 else 1970 cm_deref_id(cm_id_priv); 1971 return 0; 1972out: 1973 cm_deref_id(cm_id_priv); 1974 return -EINVAL; 1975} 1976 1977int ib_send_cm_rej(struct ib_cm_id *cm_id, 1978 enum ib_cm_rej_reason reason, 1979 void *ari, 1980 u8 ari_length, 1981 const void *private_data, 1982 u8 private_data_len) 1983{ 1984 struct cm_id_private *cm_id_priv; 1985 struct ib_mad_send_buf *msg; 1986 unsigned long flags; 1987 int ret; 1988 1989 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 1990 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 1991 return -EINVAL; 1992 1993 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1994 1995 spin_lock_irqsave(&cm_id_priv->lock, flags); 1996 switch (cm_id->state) { 1997 case IB_CM_REQ_SENT: 1998 case IB_CM_MRA_REQ_RCVD: 1999 case IB_CM_REQ_RCVD: 2000 case IB_CM_MRA_REQ_SENT: 2001 case IB_CM_REP_RCVD: 2002 case IB_CM_MRA_REP_SENT: 2003 ret = cm_alloc_msg(cm_id_priv, &msg); 2004 if (!ret) 2005 cm_format_rej((struct cm_rej_msg *) msg->mad, 2006 cm_id_priv, reason, ari, ari_length, 2007 private_data, private_data_len); 2008 2009 cm_reset_to_idle(cm_id_priv); 2010 break; 2011 case IB_CM_REP_SENT: 2012 case IB_CM_MRA_REP_RCVD: 2013 ret = cm_alloc_msg(cm_id_priv, &msg); 2014 if (!ret) 2015 cm_format_rej((struct cm_rej_msg *) msg->mad, 2016 cm_id_priv, reason, ari, ari_length, 2017 private_data, private_data_len); 2018 2019 cm_enter_timewait(cm_id_priv); 2020 break; 2021 default: 2022 ret = -EINVAL; 2023 goto out; 2024 } 2025 2026 if (ret) 2027 goto out; 2028 2029 ret = ib_post_send_mad(msg, NULL); 2030 if (ret) 2031 cm_free_msg(msg); 2032 2033out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2034 return ret; 2035} 2036EXPORT_SYMBOL(ib_send_cm_rej); 2037 2038static void cm_format_rej_event(struct cm_work *work) 2039{ 2040 struct cm_rej_msg *rej_msg; 2041 struct ib_cm_rej_event_param *param; 2042 2043 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2044 param = &work->cm_event.param.rej_rcvd; 2045 param->ari = rej_msg->ari; 2046 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2047 param->reason = __be16_to_cpu(rej_msg->reason); 2048 work->cm_event.private_data = &rej_msg->private_data; 2049} 2050 2051static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2052{ 2053 struct cm_timewait_info *timewait_info; 2054 struct cm_id_private *cm_id_priv; 2055 unsigned long flags; 2056 __be32 remote_id; 2057 2058 remote_id = rej_msg->local_comm_id; 2059 2060 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2061 spin_lock_irqsave(&cm.lock, flags); 2062 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2063 remote_id); 2064 if (!timewait_info) { 2065 spin_unlock_irqrestore(&cm.lock, flags); 2066 return NULL; 2067 } 2068 cm_id_priv = idr_find(&cm.local_id_table, 2069 (__force int) timewait_info->work.local_id); 2070 if (cm_id_priv) { 2071 if (cm_id_priv->id.remote_id == remote_id) 2072 atomic_inc(&cm_id_priv->refcount); 2073 else 2074 cm_id_priv = NULL; 2075 } 2076 spin_unlock_irqrestore(&cm.lock, flags); 2077 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2078 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2079 else 2080 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2081 2082 return cm_id_priv; 2083} 2084 2085static int cm_rej_handler(struct cm_work *work) 2086{ 2087 struct cm_id_private *cm_id_priv; 2088 struct cm_rej_msg *rej_msg; 2089 unsigned long flags; 2090 int ret; 2091 2092 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2093 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2094 if (!cm_id_priv) 2095 return -EINVAL; 2096 2097 cm_format_rej_event(work); 2098 2099 spin_lock_irqsave(&cm_id_priv->lock, flags); 2100 switch (cm_id_priv->id.state) { 2101 case IB_CM_REQ_SENT: 2102 case IB_CM_MRA_REQ_RCVD: 2103 case IB_CM_REP_SENT: 2104 case IB_CM_MRA_REP_RCVD: 2105 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2106 /* fall through */ 2107 case IB_CM_REQ_RCVD: 2108 case IB_CM_MRA_REQ_SENT: 2109 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2110 cm_enter_timewait(cm_id_priv); 2111 else 2112 cm_reset_to_idle(cm_id_priv); 2113 break; 2114 case IB_CM_DREQ_SENT: 2115 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2116 /* fall through */ 2117 case IB_CM_REP_RCVD: 2118 case IB_CM_MRA_REP_SENT: 2119 case IB_CM_ESTABLISHED: 2120 cm_enter_timewait(cm_id_priv); 2121 break; 2122 default: 2123 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2124 ret = -EINVAL; 2125 goto out; 2126 } 2127 2128 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2129 if (!ret) 2130 list_add_tail(&work->list, &cm_id_priv->work_list); 2131 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2132 2133 if (ret) 2134 cm_process_work(cm_id_priv, work); 2135 else 2136 cm_deref_id(cm_id_priv); 2137 return 0; 2138out: 2139 cm_deref_id(cm_id_priv); 2140 return -EINVAL; 2141} 2142 2143int ib_send_cm_mra(struct ib_cm_id *cm_id, 2144 u8 service_timeout, 2145 const void *private_data, 2146 u8 private_data_len) 2147{ 2148 struct cm_id_private *cm_id_priv; 2149 struct ib_mad_send_buf *msg; 2150 void *data; 2151 unsigned long flags; 2152 int ret; 2153 2154 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2155 return -EINVAL; 2156 2157 data = cm_copy_private_data(private_data, private_data_len); 2158 if (IS_ERR(data)) 2159 return PTR_ERR(data); 2160 2161 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2162 2163 spin_lock_irqsave(&cm_id_priv->lock, flags); 2164 switch(cm_id_priv->id.state) { 2165 case IB_CM_REQ_RCVD: 2166 ret = cm_alloc_msg(cm_id_priv, &msg); 2167 if (ret) 2168 goto error1; 2169 2170 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2171 CM_MSG_RESPONSE_REQ, service_timeout, 2172 private_data, private_data_len); 2173 ret = ib_post_send_mad(msg, NULL); 2174 if (ret) 2175 goto error2; 2176 cm_id->state = IB_CM_MRA_REQ_SENT; 2177 break; 2178 case IB_CM_REP_RCVD: 2179 ret = cm_alloc_msg(cm_id_priv, &msg); 2180 if (ret) 2181 goto error1; 2182 2183 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2184 CM_MSG_RESPONSE_REP, service_timeout, 2185 private_data, private_data_len); 2186 ret = ib_post_send_mad(msg, NULL); 2187 if (ret) 2188 goto error2; 2189 cm_id->state = IB_CM_MRA_REP_SENT; 2190 break; 2191 case IB_CM_ESTABLISHED: 2192 ret = cm_alloc_msg(cm_id_priv, &msg); 2193 if (ret) 2194 goto error1; 2195 2196 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2197 CM_MSG_RESPONSE_OTHER, service_timeout, 2198 private_data, private_data_len); 2199 ret = ib_post_send_mad(msg, NULL); 2200 if (ret) 2201 goto error2; 2202 cm_id->lap_state = IB_CM_MRA_LAP_SENT; 2203 break; 2204 default: 2205 ret = -EINVAL; 2206 goto error1; 2207 } 2208 cm_id_priv->service_timeout = service_timeout; 2209 cm_set_private_data(cm_id_priv, data, private_data_len); 2210 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2211 return 0; 2212 2213error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2214 kfree(data); 2215 return ret; 2216 2217error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2218 kfree(data); 2219 cm_free_msg(msg); 2220 return ret; 2221} 2222EXPORT_SYMBOL(ib_send_cm_mra); 2223 2224static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2225{ 2226 switch (cm_mra_get_msg_mraed(mra_msg)) { 2227 case CM_MSG_RESPONSE_REQ: 2228 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2229 case CM_MSG_RESPONSE_REP: 2230 case CM_MSG_RESPONSE_OTHER: 2231 return cm_acquire_id(mra_msg->remote_comm_id, 2232 mra_msg->local_comm_id); 2233 default: 2234 return NULL; 2235 } 2236} 2237 2238static int cm_mra_handler(struct cm_work *work) 2239{ 2240 struct cm_id_private *cm_id_priv; 2241 struct cm_mra_msg *mra_msg; 2242 unsigned long flags; 2243 int timeout, ret; 2244 2245 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2246 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2247 if (!cm_id_priv) 2248 return -EINVAL; 2249 2250 work->cm_event.private_data = &mra_msg->private_data; 2251 work->cm_event.param.mra_rcvd.service_timeout = 2252 cm_mra_get_service_timeout(mra_msg); 2253 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2254 cm_convert_to_ms(cm_id_priv->av.packet_life_time); 2255 2256 spin_lock_irqsave(&cm_id_priv->lock, flags); 2257 switch (cm_id_priv->id.state) { 2258 case IB_CM_REQ_SENT: 2259 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2260 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2261 cm_id_priv->msg, timeout)) 2262 goto out; 2263 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2264 break; 2265 case IB_CM_REP_SENT: 2266 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2267 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2268 cm_id_priv->msg, timeout)) 2269 goto out; 2270 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2271 break; 2272 case IB_CM_ESTABLISHED: 2273 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2274 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2275 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2276 cm_id_priv->msg, timeout)) 2277 goto out; 2278 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2279 break; 2280 default: 2281 goto out; 2282 } 2283 2284 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2285 cm_id_priv->id.state; 2286 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2287 if (!ret) 2288 list_add_tail(&work->list, &cm_id_priv->work_list); 2289 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2290 2291 if (ret) 2292 cm_process_work(cm_id_priv, work); 2293 else 2294 cm_deref_id(cm_id_priv); 2295 return 0; 2296out: 2297 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2298 cm_deref_id(cm_id_priv); 2299 return -EINVAL; 2300} 2301 2302static void cm_format_lap(struct cm_lap_msg *lap_msg, 2303 struct cm_id_private *cm_id_priv, 2304 struct ib_sa_path_rec *alternate_path, 2305 const void *private_data, 2306 u8 private_data_len) 2307{ 2308 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2309 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2310 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2311 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2312 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2313 /* todo: need remote CM response timeout */ 2314 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2315 lap_msg->alt_local_lid = alternate_path->slid; 2316 lap_msg->alt_remote_lid = alternate_path->dlid; 2317 lap_msg->alt_local_gid = alternate_path->sgid; 2318 lap_msg->alt_remote_gid = alternate_path->dgid; 2319 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2320 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2321 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2322 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2323 cm_lap_set_sl(lap_msg, alternate_path->sl); 2324 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2325 cm_lap_set_local_ack_timeout(lap_msg, 2326 min(31, alternate_path->packet_life_time + 1)); 2327 2328 if (private_data && private_data_len) 2329 memcpy(lap_msg->private_data, private_data, private_data_len); 2330} 2331 2332int ib_send_cm_lap(struct ib_cm_id *cm_id, 2333 struct ib_sa_path_rec *alternate_path, 2334 const void *private_data, 2335 u8 private_data_len) 2336{ 2337 struct cm_id_private *cm_id_priv; 2338 struct ib_mad_send_buf *msg; 2339 unsigned long flags; 2340 int ret; 2341 2342 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2343 return -EINVAL; 2344 2345 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2346 spin_lock_irqsave(&cm_id_priv->lock, flags); 2347 if (cm_id->state != IB_CM_ESTABLISHED || 2348 cm_id->lap_state != IB_CM_LAP_IDLE) { 2349 ret = -EINVAL; 2350 goto out; 2351 } 2352 2353 ret = cm_alloc_msg(cm_id_priv, &msg); 2354 if (ret) 2355 goto out; 2356 2357 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2358 alternate_path, private_data, private_data_len); 2359 msg->timeout_ms = cm_id_priv->timeout_ms; 2360 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2361 2362 ret = ib_post_send_mad(msg, NULL); 2363 if (ret) { 2364 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2365 cm_free_msg(msg); 2366 return ret; 2367 } 2368 2369 cm_id->lap_state = IB_CM_LAP_SENT; 2370 cm_id_priv->msg = msg; 2371 2372out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2373 return ret; 2374} 2375EXPORT_SYMBOL(ib_send_cm_lap); 2376 2377static void cm_format_path_from_lap(struct ib_sa_path_rec *path, 2378 struct cm_lap_msg *lap_msg) 2379{ 2380 memset(path, 0, sizeof *path); 2381 path->dgid = lap_msg->alt_local_gid; 2382 path->sgid = lap_msg->alt_remote_gid; 2383 path->dlid = lap_msg->alt_local_lid; 2384 path->slid = lap_msg->alt_remote_lid; 2385 path->flow_label = cm_lap_get_flow_label(lap_msg); 2386 path->hop_limit = lap_msg->alt_hop_limit; 2387 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2388 path->reversible = 1; 2389 /* pkey is same as in REQ */ 2390 path->sl = cm_lap_get_sl(lap_msg); 2391 path->mtu_selector = IB_SA_EQ; 2392 /* mtu is same as in REQ */ 2393 path->rate_selector = IB_SA_EQ; 2394 path->rate = cm_lap_get_packet_rate(lap_msg); 2395 path->packet_life_time_selector = IB_SA_EQ; 2396 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2397 path->packet_life_time -= (path->packet_life_time > 0); 2398} 2399 2400static int cm_lap_handler(struct cm_work *work) 2401{ 2402 struct cm_id_private *cm_id_priv; 2403 struct cm_lap_msg *lap_msg; 2404 struct ib_cm_lap_event_param *param; 2405 struct ib_mad_send_buf *msg = NULL; 2406 unsigned long flags; 2407 int ret; 2408 2409 /* todo: verify LAP request and send reject APR if invalid. */ 2410 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2411 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2412 lap_msg->local_comm_id); 2413 if (!cm_id_priv) 2414 return -EINVAL; 2415 2416 param = &work->cm_event.param.lap_rcvd; 2417 param->alternate_path = &work->path[0]; 2418 cm_format_path_from_lap(param->alternate_path, lap_msg); 2419 work->cm_event.private_data = &lap_msg->private_data; 2420 2421 spin_lock_irqsave(&cm_id_priv->lock, flags); 2422 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2423 goto unlock; 2424 2425 switch (cm_id_priv->id.lap_state) { 2426 case IB_CM_LAP_IDLE: 2427 break; 2428 case IB_CM_MRA_LAP_SENT: 2429 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2430 goto unlock; 2431 2432 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2433 CM_MSG_RESPONSE_OTHER, 2434 cm_id_priv->service_timeout, 2435 cm_id_priv->private_data, 2436 cm_id_priv->private_data_len); 2437 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2438 2439 if (ib_post_send_mad(msg, NULL)) 2440 cm_free_msg(msg); 2441 goto deref; 2442 default: 2443 goto unlock; 2444 } 2445 2446 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2447 cm_id_priv->tid = lap_msg->hdr.tid; 2448 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2449 if (!ret) 2450 list_add_tail(&work->list, &cm_id_priv->work_list); 2451 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2452 2453 if (ret) 2454 cm_process_work(cm_id_priv, work); 2455 else 2456 cm_deref_id(cm_id_priv); 2457 return 0; 2458 2459unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2460deref: cm_deref_id(cm_id_priv); 2461 return -EINVAL; 2462} 2463 2464static void cm_format_apr(struct cm_apr_msg *apr_msg, 2465 struct cm_id_private *cm_id_priv, 2466 enum ib_cm_apr_status status, 2467 void *info, 2468 u8 info_length, 2469 const void *private_data, 2470 u8 private_data_len) 2471{ 2472 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2473 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2474 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2475 apr_msg->ap_status = (u8) status; 2476 2477 if (info && info_length) { 2478 apr_msg->info_length = info_length; 2479 memcpy(apr_msg->info, info, info_length); 2480 } 2481 2482 if (private_data && private_data_len) 2483 memcpy(apr_msg->private_data, private_data, private_data_len); 2484} 2485 2486int ib_send_cm_apr(struct ib_cm_id *cm_id, 2487 enum ib_cm_apr_status status, 2488 void *info, 2489 u8 info_length, 2490 const void *private_data, 2491 u8 private_data_len) 2492{ 2493 struct cm_id_private *cm_id_priv; 2494 struct ib_mad_send_buf *msg; 2495 unsigned long flags; 2496 int ret; 2497 2498 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2499 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2500 return -EINVAL; 2501 2502 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2503 spin_lock_irqsave(&cm_id_priv->lock, flags); 2504 if (cm_id->state != IB_CM_ESTABLISHED || 2505 (cm_id->lap_state != IB_CM_LAP_RCVD && 2506 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2507 ret = -EINVAL; 2508 goto out; 2509 } 2510 2511 ret = cm_alloc_msg(cm_id_priv, &msg); 2512 if (ret) 2513 goto out; 2514 2515 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2516 info, info_length, private_data, private_data_len); 2517 ret = ib_post_send_mad(msg, NULL); 2518 if (ret) { 2519 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2520 cm_free_msg(msg); 2521 return ret; 2522 } 2523 2524 cm_id->lap_state = IB_CM_LAP_IDLE; 2525out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2526 return ret; 2527} 2528EXPORT_SYMBOL(ib_send_cm_apr); 2529 2530static int cm_apr_handler(struct cm_work *work) 2531{ 2532 struct cm_id_private *cm_id_priv; 2533 struct cm_apr_msg *apr_msg; 2534 unsigned long flags; 2535 int ret; 2536 2537 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2538 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2539 apr_msg->local_comm_id); 2540 if (!cm_id_priv) 2541 return -EINVAL; /* Unmatched reply. */ 2542 2543 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2544 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2545 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2546 work->cm_event.private_data = &apr_msg->private_data; 2547 2548 spin_lock_irqsave(&cm_id_priv->lock, flags); 2549 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2550 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2551 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2552 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2553 goto out; 2554 } 2555 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2556 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2557 cm_id_priv->msg = NULL; 2558 2559 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2560 if (!ret) 2561 list_add_tail(&work->list, &cm_id_priv->work_list); 2562 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2563 2564 if (ret) 2565 cm_process_work(cm_id_priv, work); 2566 else 2567 cm_deref_id(cm_id_priv); 2568 return 0; 2569out: 2570 cm_deref_id(cm_id_priv); 2571 return -EINVAL; 2572} 2573 2574static int cm_timewait_handler(struct cm_work *work) 2575{ 2576 struct cm_timewait_info *timewait_info; 2577 struct cm_id_private *cm_id_priv; 2578 unsigned long flags; 2579 int ret; 2580 2581 timewait_info = (struct cm_timewait_info *)work; 2582 cm_cleanup_timewait(timewait_info); 2583 2584 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2585 timewait_info->work.remote_id); 2586 if (!cm_id_priv) 2587 return -EINVAL; 2588 2589 spin_lock_irqsave(&cm_id_priv->lock, flags); 2590 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2591 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2592 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2593 goto out; 2594 } 2595 cm_id_priv->id.state = IB_CM_IDLE; 2596 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2597 if (!ret) 2598 list_add_tail(&work->list, &cm_id_priv->work_list); 2599 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2600 2601 if (ret) 2602 cm_process_work(cm_id_priv, work); 2603 else 2604 cm_deref_id(cm_id_priv); 2605 return 0; 2606out: 2607 cm_deref_id(cm_id_priv); 2608 return -EINVAL; 2609} 2610 2611static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2612 struct cm_id_private *cm_id_priv, 2613 struct ib_cm_sidr_req_param *param) 2614{ 2615 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2616 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2617 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2618 sidr_req_msg->pkey = cpu_to_be16(param->pkey); 2619 sidr_req_msg->service_id = param->service_id; 2620 2621 if (param->private_data && param->private_data_len) 2622 memcpy(sidr_req_msg->private_data, param->private_data, 2623 param->private_data_len); 2624} 2625 2626int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2627 struct ib_cm_sidr_req_param *param) 2628{ 2629 struct cm_id_private *cm_id_priv; 2630 struct ib_mad_send_buf *msg; 2631 unsigned long flags; 2632 int ret; 2633 2634 if (!param->path || (param->private_data && 2635 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2636 return -EINVAL; 2637 2638 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2639 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2640 if (ret) 2641 goto out; 2642 2643 cm_id->service_id = param->service_id; 2644 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2645 cm_id_priv->timeout_ms = param->timeout_ms; 2646 cm_id_priv->max_cm_retries = param->max_cm_retries; 2647 ret = cm_alloc_msg(cm_id_priv, &msg); 2648 if (ret) 2649 goto out; 2650 2651 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2652 param); 2653 msg->timeout_ms = cm_id_priv->timeout_ms; 2654 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2655 2656 spin_lock_irqsave(&cm_id_priv->lock, flags); 2657 if (cm_id->state == IB_CM_IDLE) 2658 ret = ib_post_send_mad(msg, NULL); 2659 else 2660 ret = -EINVAL; 2661 2662 if (ret) { 2663 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2664 cm_free_msg(msg); 2665 goto out; 2666 } 2667 cm_id->state = IB_CM_SIDR_REQ_SENT; 2668 cm_id_priv->msg = msg; 2669 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2670out: 2671 return ret; 2672} 2673EXPORT_SYMBOL(ib_send_cm_sidr_req); 2674 2675static void cm_format_sidr_req_event(struct cm_work *work, 2676 struct ib_cm_id *listen_id) 2677{ 2678 struct cm_sidr_req_msg *sidr_req_msg; 2679 struct ib_cm_sidr_req_event_param *param; 2680 2681 sidr_req_msg = (struct cm_sidr_req_msg *) 2682 work->mad_recv_wc->recv_buf.mad; 2683 param = &work->cm_event.param.sidr_req_rcvd; 2684 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2685 param->listen_id = listen_id; 2686 param->port = work->port->port_num; 2687 work->cm_event.private_data = &sidr_req_msg->private_data; 2688} 2689 2690static int cm_sidr_req_handler(struct cm_work *work) 2691{ 2692 struct ib_cm_id *cm_id; 2693 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2694 struct cm_sidr_req_msg *sidr_req_msg; 2695 struct ib_wc *wc; 2696 unsigned long flags; 2697 2698 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2699 if (IS_ERR(cm_id)) 2700 return PTR_ERR(cm_id); 2701 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2702 2703 /* Record SGID/SLID and request ID for lookup. */ 2704 sidr_req_msg = (struct cm_sidr_req_msg *) 2705 work->mad_recv_wc->recv_buf.mad; 2706 wc = work->mad_recv_wc->wc; 2707 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2708 cm_id_priv->av.dgid.global.interface_id = 0; 2709 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2710 &cm_id_priv->av); 2711 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2712 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2713 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2714 atomic_inc(&cm_id_priv->work_count); 2715 2716 spin_lock_irqsave(&cm.lock, flags); 2717 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2718 if (cur_cm_id_priv) { 2719 spin_unlock_irqrestore(&cm.lock, flags); 2720 goto out; /* Duplicate message. */ 2721 } 2722 cur_cm_id_priv = cm_find_listen(cm_id->device, 2723 sidr_req_msg->service_id, 2724 sidr_req_msg->private_data); 2725 if (!cur_cm_id_priv) { 2726 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2727 spin_unlock_irqrestore(&cm.lock, flags); 2728 /* todo: reply with no match */ 2729 goto out; /* No match. */ 2730 } 2731 atomic_inc(&cur_cm_id_priv->refcount); 2732 spin_unlock_irqrestore(&cm.lock, flags); 2733 2734 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2735 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2736 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2737 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2738 2739 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2740 cm_process_work(cm_id_priv, work); 2741 cm_deref_id(cur_cm_id_priv); 2742 return 0; 2743out: 2744 ib_destroy_cm_id(&cm_id_priv->id); 2745 return -EINVAL; 2746} 2747 2748static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2749 struct cm_id_private *cm_id_priv, 2750 struct ib_cm_sidr_rep_param *param) 2751{ 2752 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2753 cm_id_priv->tid); 2754 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2755 sidr_rep_msg->status = param->status; 2756 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2757 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2758 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2759 2760 if (param->info && param->info_length) 2761 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2762 2763 if (param->private_data && param->private_data_len) 2764 memcpy(sidr_rep_msg->private_data, param->private_data, 2765 param->private_data_len); 2766} 2767 2768int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2769 struct ib_cm_sidr_rep_param *param) 2770{ 2771 struct cm_id_private *cm_id_priv; 2772 struct ib_mad_send_buf *msg; 2773 unsigned long flags; 2774 int ret; 2775 2776 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2777 (param->private_data && 2778 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2779 return -EINVAL; 2780 2781 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2782 spin_lock_irqsave(&cm_id_priv->lock, flags); 2783 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2784 ret = -EINVAL; 2785 goto error; 2786 } 2787 2788 ret = cm_alloc_msg(cm_id_priv, &msg); 2789 if (ret) 2790 goto error; 2791 2792 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2793 param); 2794 ret = ib_post_send_mad(msg, NULL); 2795 if (ret) { 2796 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2797 cm_free_msg(msg); 2798 return ret; 2799 } 2800 cm_id->state = IB_CM_IDLE; 2801 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2802 2803 spin_lock_irqsave(&cm.lock, flags); 2804 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2805 spin_unlock_irqrestore(&cm.lock, flags); 2806 return 0; 2807 2808error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2809 return ret; 2810} 2811EXPORT_SYMBOL(ib_send_cm_sidr_rep); 2812 2813static void cm_format_sidr_rep_event(struct cm_work *work) 2814{ 2815 struct cm_sidr_rep_msg *sidr_rep_msg; 2816 struct ib_cm_sidr_rep_event_param *param; 2817 2818 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2819 work->mad_recv_wc->recv_buf.mad; 2820 param = &work->cm_event.param.sidr_rep_rcvd; 2821 param->status = sidr_rep_msg->status; 2822 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 2823 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 2824 param->info = &sidr_rep_msg->info; 2825 param->info_len = sidr_rep_msg->info_length; 2826 work->cm_event.private_data = &sidr_rep_msg->private_data; 2827} 2828 2829static int cm_sidr_rep_handler(struct cm_work *work) 2830{ 2831 struct cm_sidr_rep_msg *sidr_rep_msg; 2832 struct cm_id_private *cm_id_priv; 2833 unsigned long flags; 2834 2835 sidr_rep_msg = (struct cm_sidr_rep_msg *) 2836 work->mad_recv_wc->recv_buf.mad; 2837 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 2838 if (!cm_id_priv) 2839 return -EINVAL; /* Unmatched reply. */ 2840 2841 spin_lock_irqsave(&cm_id_priv->lock, flags); 2842 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 2843 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2844 goto out; 2845 } 2846 cm_id_priv->id.state = IB_CM_IDLE; 2847 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2848 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2849 2850 cm_format_sidr_rep_event(work); 2851 cm_process_work(cm_id_priv, work); 2852 return 0; 2853out: 2854 cm_deref_id(cm_id_priv); 2855 return -EINVAL; 2856} 2857 2858static void cm_process_send_error(struct ib_mad_send_buf *msg, 2859 enum ib_wc_status wc_status) 2860{ 2861 struct cm_id_private *cm_id_priv; 2862 struct ib_cm_event cm_event; 2863 enum ib_cm_state state; 2864 unsigned long flags; 2865 int ret; 2866 2867 memset(&cm_event, 0, sizeof cm_event); 2868 cm_id_priv = msg->context[0]; 2869 2870 /* Discard old sends or ones without a response. */ 2871 spin_lock_irqsave(&cm_id_priv->lock, flags); 2872 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 2873 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 2874 goto discard; 2875 2876 switch (state) { 2877 case IB_CM_REQ_SENT: 2878 case IB_CM_MRA_REQ_RCVD: 2879 cm_reset_to_idle(cm_id_priv); 2880 cm_event.event = IB_CM_REQ_ERROR; 2881 break; 2882 case IB_CM_REP_SENT: 2883 case IB_CM_MRA_REP_RCVD: 2884 cm_reset_to_idle(cm_id_priv); 2885 cm_event.event = IB_CM_REP_ERROR; 2886 break; 2887 case IB_CM_DREQ_SENT: 2888 cm_enter_timewait(cm_id_priv); 2889 cm_event.event = IB_CM_DREQ_ERROR; 2890 break; 2891 case IB_CM_SIDR_REQ_SENT: 2892 cm_id_priv->id.state = IB_CM_IDLE; 2893 cm_event.event = IB_CM_SIDR_REQ_ERROR; 2894 break; 2895 default: 2896 goto discard; 2897 } 2898 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2899 cm_event.param.send_status = wc_status; 2900 2901 /* No other events can occur on the cm_id at this point. */ 2902 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 2903 cm_free_msg(msg); 2904 if (ret) 2905 ib_destroy_cm_id(&cm_id_priv->id); 2906 return; 2907discard: 2908 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2909 cm_free_msg(msg); 2910} 2911 2912static void cm_send_handler(struct ib_mad_agent *mad_agent, 2913 struct ib_mad_send_wc *mad_send_wc) 2914{ 2915 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 2916 2917 switch (mad_send_wc->status) { 2918 case IB_WC_SUCCESS: 2919 case IB_WC_WR_FLUSH_ERR: 2920 cm_free_msg(msg); 2921 break; 2922 default: 2923 if (msg->context[0] && msg->context[1]) 2924 cm_process_send_error(msg, mad_send_wc->status); 2925 else 2926 cm_free_msg(msg); 2927 break; 2928 } 2929} 2930 2931static void cm_work_handler(void *data) 2932{ 2933 struct cm_work *work = data; 2934 int ret; 2935 2936 switch (work->cm_event.event) { 2937 case IB_CM_REQ_RECEIVED: 2938 ret = cm_req_handler(work); 2939 break; 2940 case IB_CM_MRA_RECEIVED: 2941 ret = cm_mra_handler(work); 2942 break; 2943 case IB_CM_REJ_RECEIVED: 2944 ret = cm_rej_handler(work); 2945 break; 2946 case IB_CM_REP_RECEIVED: 2947 ret = cm_rep_handler(work); 2948 break; 2949 case IB_CM_RTU_RECEIVED: 2950 ret = cm_rtu_handler(work); 2951 break; 2952 case IB_CM_USER_ESTABLISHED: 2953 ret = cm_establish_handler(work); 2954 break; 2955 case IB_CM_DREQ_RECEIVED: 2956 ret = cm_dreq_handler(work); 2957 break; 2958 case IB_CM_DREP_RECEIVED: 2959 ret = cm_drep_handler(work); 2960 break; 2961 case IB_CM_SIDR_REQ_RECEIVED: 2962 ret = cm_sidr_req_handler(work); 2963 break; 2964 case IB_CM_SIDR_REP_RECEIVED: 2965 ret = cm_sidr_rep_handler(work); 2966 break; 2967 case IB_CM_LAP_RECEIVED: 2968 ret = cm_lap_handler(work); 2969 break; 2970 case IB_CM_APR_RECEIVED: 2971 ret = cm_apr_handler(work); 2972 break; 2973 case IB_CM_TIMEWAIT_EXIT: 2974 ret = cm_timewait_handler(work); 2975 break; 2976 default: 2977 ret = -EINVAL; 2978 break; 2979 } 2980 if (ret) 2981 cm_free_work(work); 2982} 2983 2984int ib_cm_establish(struct ib_cm_id *cm_id) 2985{ 2986 struct cm_id_private *cm_id_priv; 2987 struct cm_work *work; 2988 unsigned long flags; 2989 int ret = 0; 2990 2991 work = kmalloc(sizeof *work, GFP_ATOMIC); 2992 if (!work) 2993 return -ENOMEM; 2994 2995 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2996 spin_lock_irqsave(&cm_id_priv->lock, flags); 2997 switch (cm_id->state) 2998 { 2999 case IB_CM_REP_SENT: 3000 case IB_CM_MRA_REP_RCVD: 3001 cm_id->state = IB_CM_ESTABLISHED; 3002 break; 3003 case IB_CM_ESTABLISHED: 3004 ret = -EISCONN; 3005 break; 3006 default: 3007 ret = -EINVAL; 3008 break; 3009 } 3010 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3011 3012 if (ret) { 3013 kfree(work); 3014 goto out; 3015 } 3016 3017 /* 3018 * The CM worker thread may try to destroy the cm_id before it 3019 * can execute this work item. To prevent potential deadlock, 3020 * we need to find the cm_id once we're in the context of the 3021 * worker thread, rather than holding a reference on it. 3022 */ 3023 INIT_WORK(&work->work, cm_work_handler, work); 3024 work->local_id = cm_id->local_id; 3025 work->remote_id = cm_id->remote_id; 3026 work->mad_recv_wc = NULL; 3027 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3028 queue_work(cm.wq, &work->work); 3029out: 3030 return ret; 3031} 3032EXPORT_SYMBOL(ib_cm_establish); 3033 3034static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3035 struct ib_mad_recv_wc *mad_recv_wc) 3036{ 3037 struct cm_work *work; 3038 enum ib_cm_event_type event; 3039 int paths = 0; 3040 3041 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3042 case CM_REQ_ATTR_ID: 3043 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3044 alt_local_lid != 0); 3045 event = IB_CM_REQ_RECEIVED; 3046 break; 3047 case CM_MRA_ATTR_ID: 3048 event = IB_CM_MRA_RECEIVED; 3049 break; 3050 case CM_REJ_ATTR_ID: 3051 event = IB_CM_REJ_RECEIVED; 3052 break; 3053 case CM_REP_ATTR_ID: 3054 event = IB_CM_REP_RECEIVED; 3055 break; 3056 case CM_RTU_ATTR_ID: 3057 event = IB_CM_RTU_RECEIVED; 3058 break; 3059 case CM_DREQ_ATTR_ID: 3060 event = IB_CM_DREQ_RECEIVED; 3061 break; 3062 case CM_DREP_ATTR_ID: 3063 event = IB_CM_DREP_RECEIVED; 3064 break; 3065 case CM_SIDR_REQ_ATTR_ID: 3066 event = IB_CM_SIDR_REQ_RECEIVED; 3067 break; 3068 case CM_SIDR_REP_ATTR_ID: 3069 event = IB_CM_SIDR_REP_RECEIVED; 3070 break; 3071 case CM_LAP_ATTR_ID: 3072 paths = 1; 3073 event = IB_CM_LAP_RECEIVED; 3074 break; 3075 case CM_APR_ATTR_ID: 3076 event = IB_CM_APR_RECEIVED; 3077 break; 3078 default: 3079 ib_free_recv_mad(mad_recv_wc); 3080 return; 3081 } 3082 3083 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3084 GFP_KERNEL); 3085 if (!work) { 3086 ib_free_recv_mad(mad_recv_wc); 3087 return; 3088 } 3089 3090 INIT_WORK(&work->work, cm_work_handler, work); 3091 work->cm_event.event = event; 3092 work->mad_recv_wc = mad_recv_wc; 3093 work->port = (struct cm_port *)mad_agent->context; 3094 queue_work(cm.wq, &work->work); 3095} 3096 3097static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3098 struct ib_qp_attr *qp_attr, 3099 int *qp_attr_mask) 3100{ 3101 unsigned long flags; 3102 int ret; 3103 3104 spin_lock_irqsave(&cm_id_priv->lock, flags); 3105 switch (cm_id_priv->id.state) { 3106 case IB_CM_REQ_SENT: 3107 case IB_CM_MRA_REQ_RCVD: 3108 case IB_CM_REQ_RCVD: 3109 case IB_CM_MRA_REQ_SENT: 3110 case IB_CM_REP_RCVD: 3111 case IB_CM_MRA_REP_SENT: 3112 case IB_CM_REP_SENT: 3113 case IB_CM_MRA_REP_RCVD: 3114 case IB_CM_ESTABLISHED: 3115 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3116 IB_QP_PKEY_INDEX | IB_QP_PORT; 3117 qp_attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | 3118 IB_ACCESS_REMOTE_WRITE; 3119 if (cm_id_priv->responder_resources) 3120 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ; 3121 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3122 qp_attr->port_num = cm_id_priv->av.port->port_num; 3123 ret = 0; 3124 break; 3125 default: 3126 ret = -EINVAL; 3127 break; 3128 } 3129 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3130 return ret; 3131} 3132 3133static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3134 struct ib_qp_attr *qp_attr, 3135 int *qp_attr_mask) 3136{ 3137 unsigned long flags; 3138 int ret; 3139 3140 spin_lock_irqsave(&cm_id_priv->lock, flags); 3141 switch (cm_id_priv->id.state) { 3142 case IB_CM_REQ_RCVD: 3143 case IB_CM_MRA_REQ_SENT: 3144 case IB_CM_REP_RCVD: 3145 case IB_CM_MRA_REP_SENT: 3146 case IB_CM_REP_SENT: 3147 case IB_CM_MRA_REP_RCVD: 3148 case IB_CM_ESTABLISHED: 3149 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3150 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3151 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3152 qp_attr->path_mtu = cm_id_priv->path_mtu; 3153 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3154 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3155 if (cm_id_priv->qp_type == IB_QPT_RC) { 3156 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3157 IB_QP_MIN_RNR_TIMER; 3158 qp_attr->max_dest_rd_atomic = 3159 cm_id_priv->responder_resources; 3160 qp_attr->min_rnr_timer = 0; 3161 } 3162 if (cm_id_priv->alt_av.ah_attr.dlid) { 3163 *qp_attr_mask |= IB_QP_ALT_PATH; 3164 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3165 } 3166 ret = 0; 3167 break; 3168 default: 3169 ret = -EINVAL; 3170 break; 3171 } 3172 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3173 return ret; 3174} 3175 3176static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3177 struct ib_qp_attr *qp_attr, 3178 int *qp_attr_mask) 3179{ 3180 unsigned long flags; 3181 int ret; 3182 3183 spin_lock_irqsave(&cm_id_priv->lock, flags); 3184 switch (cm_id_priv->id.state) { 3185 case IB_CM_REP_RCVD: 3186 case IB_CM_MRA_REP_SENT: 3187 case IB_CM_REP_SENT: 3188 case IB_CM_MRA_REP_RCVD: 3189 case IB_CM_ESTABLISHED: 3190 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3191 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3192 if (cm_id_priv->qp_type == IB_QPT_RC) { 3193 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3194 IB_QP_RNR_RETRY | 3195 IB_QP_MAX_QP_RD_ATOMIC; 3196 qp_attr->timeout = cm_id_priv->local_ack_timeout; 3197 qp_attr->retry_cnt = cm_id_priv->retry_count; 3198 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3199 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3200 } 3201 if (cm_id_priv->alt_av.ah_attr.dlid) { 3202 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3203 qp_attr->path_mig_state = IB_MIG_REARM; 3204 } 3205 ret = 0; 3206 break; 3207 default: 3208 ret = -EINVAL; 3209 break; 3210 } 3211 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3212 return ret; 3213} 3214 3215int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3216 struct ib_qp_attr *qp_attr, 3217 int *qp_attr_mask) 3218{ 3219 struct cm_id_private *cm_id_priv; 3220 int ret; 3221 3222 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3223 switch (qp_attr->qp_state) { 3224 case IB_QPS_INIT: 3225 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3226 break; 3227 case IB_QPS_RTR: 3228 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3229 break; 3230 case IB_QPS_RTS: 3231 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3232 break; 3233 default: 3234 ret = -EINVAL; 3235 break; 3236 } 3237 return ret; 3238} 3239EXPORT_SYMBOL(ib_cm_init_qp_attr); 3240 3241static void cm_add_one(struct ib_device *device) 3242{ 3243 struct cm_device *cm_dev; 3244 struct cm_port *port; 3245 struct ib_mad_reg_req reg_req = { 3246 .mgmt_class = IB_MGMT_CLASS_CM, 3247 .mgmt_class_version = IB_CM_CLASS_VERSION 3248 }; 3249 struct ib_port_modify port_modify = { 3250 .set_port_cap_mask = IB_PORT_CM_SUP 3251 }; 3252 unsigned long flags; 3253 int ret; 3254 u8 i; 3255 3256 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) * 3257 device->phys_port_cnt, GFP_KERNEL); 3258 if (!cm_dev) 3259 return; 3260 3261 cm_dev->device = device; 3262 cm_dev->ca_guid = device->node_guid; 3263 3264 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3265 for (i = 1; i <= device->phys_port_cnt; i++) { 3266 port = &cm_dev->port[i-1]; 3267 port->cm_dev = cm_dev; 3268 port->port_num = i; 3269 port->mad_agent = ib_register_mad_agent(device, i, 3270 IB_QPT_GSI, 3271 ®_req, 3272 0, 3273 cm_send_handler, 3274 cm_recv_handler, 3275 port); 3276 if (IS_ERR(port->mad_agent)) 3277 goto error1; 3278 3279 ret = ib_modify_port(device, i, 0, &port_modify); 3280 if (ret) 3281 goto error2; 3282 } 3283 ib_set_client_data(device, &cm_client, cm_dev); 3284 3285 write_lock_irqsave(&cm.device_lock, flags); 3286 list_add_tail(&cm_dev->list, &cm.device_list); 3287 write_unlock_irqrestore(&cm.device_lock, flags); 3288 return; 3289 3290error2: 3291 ib_unregister_mad_agent(port->mad_agent); 3292error1: 3293 port_modify.set_port_cap_mask = 0; 3294 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3295 while (--i) { 3296 port = &cm_dev->port[i-1]; 3297 ib_modify_port(device, port->port_num, 0, &port_modify); 3298 ib_unregister_mad_agent(port->mad_agent); 3299 } 3300 kfree(cm_dev); 3301} 3302 3303static void cm_remove_one(struct ib_device *device) 3304{ 3305 struct cm_device *cm_dev; 3306 struct cm_port *port; 3307 struct ib_port_modify port_modify = { 3308 .clr_port_cap_mask = IB_PORT_CM_SUP 3309 }; 3310 unsigned long flags; 3311 int i; 3312 3313 cm_dev = ib_get_client_data(device, &cm_client); 3314 if (!cm_dev) 3315 return; 3316 3317 write_lock_irqsave(&cm.device_lock, flags); 3318 list_del(&cm_dev->list); 3319 write_unlock_irqrestore(&cm.device_lock, flags); 3320 3321 for (i = 1; i <= device->phys_port_cnt; i++) { 3322 port = &cm_dev->port[i-1]; 3323 ib_modify_port(device, port->port_num, 0, &port_modify); 3324 ib_unregister_mad_agent(port->mad_agent); 3325 } 3326 kfree(cm_dev); 3327} 3328 3329static int __init ib_cm_init(void) 3330{ 3331 int ret; 3332 3333 memset(&cm, 0, sizeof cm); 3334 INIT_LIST_HEAD(&cm.device_list); 3335 rwlock_init(&cm.device_lock); 3336 spin_lock_init(&cm.lock); 3337 cm.listen_service_table = RB_ROOT; 3338 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3339 cm.remote_id_table = RB_ROOT; 3340 cm.remote_qp_table = RB_ROOT; 3341 cm.remote_sidr_table = RB_ROOT; 3342 idr_init(&cm.local_id_table); 3343 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3344 3345 cm.wq = create_workqueue("ib_cm"); 3346 if (!cm.wq) 3347 return -ENOMEM; 3348 3349 ret = ib_register_client(&cm_client); 3350 if (ret) 3351 goto error; 3352 3353 return 0; 3354error: 3355 destroy_workqueue(cm.wq); 3356 return ret; 3357} 3358 3359static void __exit ib_cm_cleanup(void) 3360{ 3361 flush_workqueue(cm.wq); 3362 destroy_workqueue(cm.wq); 3363 ib_unregister_client(&cm_client); 3364 idr_destroy(&cm.local_id_table); 3365} 3366 3367module_init(ib_cm_init); 3368module_exit(ib_cm_cleanup); 3369 3370