cm.c revision ef70044647b260cb6b7863f392384a06670d0b2a
1/* 2 * Copyright (c) 2004-2007 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 36#include <linux/completion.h> 37#include <linux/dma-mapping.h> 38#include <linux/device.h> 39#include <linux/err.h> 40#include <linux/idr.h> 41#include <linux/interrupt.h> 42#include <linux/random.h> 43#include <linux/rbtree.h> 44#include <linux/spinlock.h> 45#include <linux/slab.h> 46#include <linux/sysfs.h> 47#include <linux/workqueue.h> 48#include <linux/kdev_t.h> 49 50#include <rdma/ib_cache.h> 51#include <rdma/ib_cm.h> 52#include "cm_msgs.h" 53 54MODULE_AUTHOR("Sean Hefty"); 55MODULE_DESCRIPTION("InfiniBand CM"); 56MODULE_LICENSE("Dual BSD/GPL"); 57 58static void cm_add_one(struct ib_device *device); 59static void cm_remove_one(struct ib_device *device); 60 61static struct ib_client cm_client = { 62 .name = "cm", 63 .add = cm_add_one, 64 .remove = cm_remove_one 65}; 66 67static struct ib_cm { 68 spinlock_t lock; 69 struct list_head device_list; 70 rwlock_t device_lock; 71 struct rb_root listen_service_table; 72 u64 listen_service_id; 73 /* struct rb_root peer_service_table; todo: fix peer to peer */ 74 struct rb_root remote_qp_table; 75 struct rb_root remote_id_table; 76 struct rb_root remote_sidr_table; 77 struct idr local_id_table; 78 __be32 random_id_operand; 79 struct list_head timewait_list; 80 struct workqueue_struct *wq; 81} cm; 82 83/* Counter indexes ordered by attribute ID */ 84enum { 85 CM_REQ_COUNTER, 86 CM_MRA_COUNTER, 87 CM_REJ_COUNTER, 88 CM_REP_COUNTER, 89 CM_RTU_COUNTER, 90 CM_DREQ_COUNTER, 91 CM_DREP_COUNTER, 92 CM_SIDR_REQ_COUNTER, 93 CM_SIDR_REP_COUNTER, 94 CM_LAP_COUNTER, 95 CM_APR_COUNTER, 96 CM_ATTR_COUNT, 97 CM_ATTR_ID_OFFSET = 0x0010, 98}; 99 100enum { 101 CM_XMIT, 102 CM_XMIT_RETRIES, 103 CM_RECV, 104 CM_RECV_DUPLICATES, 105 CM_COUNTER_GROUPS 106}; 107 108static char const counter_group_names[CM_COUNTER_GROUPS] 109 [sizeof("cm_rx_duplicates")] = { 110 "cm_tx_msgs", "cm_tx_retries", 111 "cm_rx_msgs", "cm_rx_duplicates" 112}; 113 114struct cm_counter_group { 115 struct kobject obj; 116 atomic_long_t counter[CM_ATTR_COUNT]; 117}; 118 119struct cm_counter_attribute { 120 struct attribute attr; 121 int index; 122}; 123 124#define CM_COUNTER_ATTR(_name, _index) \ 125struct cm_counter_attribute cm_##_name##_counter_attr = { \ 126 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 127 .index = _index \ 128} 129 130static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 131static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 132static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 133static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 134static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 135static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 136static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 137static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 138static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 139static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 140static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 141 142static struct attribute *cm_counter_default_attrs[] = { 143 &cm_req_counter_attr.attr, 144 &cm_mra_counter_attr.attr, 145 &cm_rej_counter_attr.attr, 146 &cm_rep_counter_attr.attr, 147 &cm_rtu_counter_attr.attr, 148 &cm_dreq_counter_attr.attr, 149 &cm_drep_counter_attr.attr, 150 &cm_sidr_req_counter_attr.attr, 151 &cm_sidr_rep_counter_attr.attr, 152 &cm_lap_counter_attr.attr, 153 &cm_apr_counter_attr.attr, 154 NULL 155}; 156 157struct cm_port { 158 struct cm_device *cm_dev; 159 struct ib_mad_agent *mad_agent; 160 struct kobject port_obj; 161 u8 port_num; 162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 163}; 164 165struct cm_device { 166 struct list_head list; 167 struct ib_device *ib_device; 168 struct device *device; 169 u8 ack_delay; 170 struct cm_port *port[0]; 171}; 172 173struct cm_av { 174 struct cm_port *port; 175 union ib_gid dgid; 176 struct ib_ah_attr ah_attr; 177 u16 pkey_index; 178 u8 timeout; 179}; 180 181struct cm_work { 182 struct delayed_work work; 183 struct list_head list; 184 struct cm_port *port; 185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 186 __be32 local_id; /* Established / timewait */ 187 __be32 remote_id; 188 struct ib_cm_event cm_event; 189 struct ib_sa_path_rec path[0]; 190}; 191 192struct cm_timewait_info { 193 struct cm_work work; /* Must be first. */ 194 struct list_head list; 195 struct rb_node remote_qp_node; 196 struct rb_node remote_id_node; 197 __be64 remote_ca_guid; 198 __be32 remote_qpn; 199 u8 inserted_remote_qp; 200 u8 inserted_remote_id; 201}; 202 203struct cm_id_private { 204 struct ib_cm_id id; 205 206 struct rb_node service_node; 207 struct rb_node sidr_id_node; 208 spinlock_t lock; /* Do not acquire inside cm.lock */ 209 struct completion comp; 210 atomic_t refcount; 211 212 struct ib_mad_send_buf *msg; 213 struct cm_timewait_info *timewait_info; 214 /* todo: use alternate port on send failure */ 215 struct cm_av av; 216 struct cm_av alt_av; 217 struct ib_cm_compare_data *compare_data; 218 219 void *private_data; 220 __be64 tid; 221 __be32 local_qpn; 222 __be32 remote_qpn; 223 enum ib_qp_type qp_type; 224 __be32 sq_psn; 225 __be32 rq_psn; 226 int timeout_ms; 227 enum ib_mtu path_mtu; 228 __be16 pkey; 229 u8 private_data_len; 230 u8 max_cm_retries; 231 u8 peer_to_peer; 232 u8 responder_resources; 233 u8 initiator_depth; 234 u8 retry_count; 235 u8 rnr_retry_count; 236 u8 service_timeout; 237 u8 target_ack_delay; 238 239 struct list_head work_list; 240 atomic_t work_count; 241}; 242 243static void cm_work_handler(struct work_struct *work); 244 245static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 246{ 247 if (atomic_dec_and_test(&cm_id_priv->refcount)) 248 complete(&cm_id_priv->comp); 249} 250 251static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 252 struct ib_mad_send_buf **msg) 253{ 254 struct ib_mad_agent *mad_agent; 255 struct ib_mad_send_buf *m; 256 struct ib_ah *ah; 257 258 mad_agent = cm_id_priv->av.port->mad_agent; 259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 260 if (IS_ERR(ah)) 261 return PTR_ERR(ah); 262 263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 264 cm_id_priv->av.pkey_index, 265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 266 GFP_ATOMIC); 267 if (IS_ERR(m)) { 268 ib_destroy_ah(ah); 269 return PTR_ERR(m); 270 } 271 272 /* Timeout set by caller if response is expected. */ 273 m->ah = ah; 274 m->retries = cm_id_priv->max_cm_retries; 275 276 atomic_inc(&cm_id_priv->refcount); 277 m->context[0] = cm_id_priv; 278 *msg = m; 279 return 0; 280} 281 282static int cm_alloc_response_msg(struct cm_port *port, 283 struct ib_mad_recv_wc *mad_recv_wc, 284 struct ib_mad_send_buf **msg) 285{ 286 struct ib_mad_send_buf *m; 287 struct ib_ah *ah; 288 289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 290 mad_recv_wc->recv_buf.grh, port->port_num); 291 if (IS_ERR(ah)) 292 return PTR_ERR(ah); 293 294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 296 GFP_ATOMIC); 297 if (IS_ERR(m)) { 298 ib_destroy_ah(ah); 299 return PTR_ERR(m); 300 } 301 m->ah = ah; 302 *msg = m; 303 return 0; 304} 305 306static void cm_free_msg(struct ib_mad_send_buf *msg) 307{ 308 ib_destroy_ah(msg->ah); 309 if (msg->context[0]) 310 cm_deref_id(msg->context[0]); 311 ib_free_send_mad(msg); 312} 313 314static void * cm_copy_private_data(const void *private_data, 315 u8 private_data_len) 316{ 317 void *data; 318 319 if (!private_data || !private_data_len) 320 return NULL; 321 322 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 323 if (!data) 324 return ERR_PTR(-ENOMEM); 325 326 return data; 327} 328 329static void cm_set_private_data(struct cm_id_private *cm_id_priv, 330 void *private_data, u8 private_data_len) 331{ 332 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 333 kfree(cm_id_priv->private_data); 334 335 cm_id_priv->private_data = private_data; 336 cm_id_priv->private_data_len = private_data_len; 337} 338 339static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 340 struct ib_grh *grh, struct cm_av *av) 341{ 342 av->port = port; 343 av->pkey_index = wc->pkey_index; 344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 345 grh, &av->ah_attr); 346} 347 348static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 349{ 350 struct cm_device *cm_dev; 351 struct cm_port *port = NULL; 352 unsigned long flags; 353 int ret; 354 u8 p; 355 356 read_lock_irqsave(&cm.device_lock, flags); 357 list_for_each_entry(cm_dev, &cm.device_list, list) { 358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 359 &p, NULL)) { 360 port = cm_dev->port[p-1]; 361 break; 362 } 363 } 364 read_unlock_irqrestore(&cm.device_lock, flags); 365 366 if (!port) 367 return -EINVAL; 368 369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 370 be16_to_cpu(path->pkey), &av->pkey_index); 371 if (ret) 372 return ret; 373 374 av->port = port; 375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 376 &av->ah_attr); 377 av->timeout = path->packet_life_time + 1; 378 return 0; 379} 380 381static int cm_alloc_id(struct cm_id_private *cm_id_priv) 382{ 383 unsigned long flags; 384 int ret, id; 385 static int next_id; 386 387 do { 388 spin_lock_irqsave(&cm.lock, flags); 389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 390 next_id, &id); 391 if (!ret) 392 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 393 spin_unlock_irqrestore(&cm.lock, flags); 394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 395 396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 397 return ret; 398} 399 400static void cm_free_id(__be32 local_id) 401{ 402 spin_lock_irq(&cm.lock); 403 idr_remove(&cm.local_id_table, 404 (__force int) (local_id ^ cm.random_id_operand)); 405 spin_unlock_irq(&cm.lock); 406} 407 408static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 409{ 410 struct cm_id_private *cm_id_priv; 411 412 cm_id_priv = idr_find(&cm.local_id_table, 413 (__force int) (local_id ^ cm.random_id_operand)); 414 if (cm_id_priv) { 415 if (cm_id_priv->id.remote_id == remote_id) 416 atomic_inc(&cm_id_priv->refcount); 417 else 418 cm_id_priv = NULL; 419 } 420 421 return cm_id_priv; 422} 423 424static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 425{ 426 struct cm_id_private *cm_id_priv; 427 428 spin_lock_irq(&cm.lock); 429 cm_id_priv = cm_get_id(local_id, remote_id); 430 spin_unlock_irq(&cm.lock); 431 432 return cm_id_priv; 433} 434 435static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 436{ 437 int i; 438 439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 441 ((unsigned long *) mask)[i]; 442} 443 444static int cm_compare_data(struct ib_cm_compare_data *src_data, 445 struct ib_cm_compare_data *dst_data) 446{ 447 u8 src[IB_CM_COMPARE_SIZE]; 448 u8 dst[IB_CM_COMPARE_SIZE]; 449 450 if (!src_data || !dst_data) 451 return 0; 452 453 cm_mask_copy(src, src_data->data, dst_data->mask); 454 cm_mask_copy(dst, dst_data->data, src_data->mask); 455 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 456} 457 458static int cm_compare_private_data(u8 *private_data, 459 struct ib_cm_compare_data *dst_data) 460{ 461 u8 src[IB_CM_COMPARE_SIZE]; 462 463 if (!dst_data) 464 return 0; 465 466 cm_mask_copy(src, private_data, dst_data->mask); 467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 468} 469 470/* 471 * Trivial helpers to strip endian annotation and compare; the 472 * endianness doesn't actually matter since we just need a stable 473 * order for the RB tree. 474 */ 475static int be32_lt(__be32 a, __be32 b) 476{ 477 return (__force u32) a < (__force u32) b; 478} 479 480static int be32_gt(__be32 a, __be32 b) 481{ 482 return (__force u32) a > (__force u32) b; 483} 484 485static int be64_lt(__be64 a, __be64 b) 486{ 487 return (__force u64) a < (__force u64) b; 488} 489 490static int be64_gt(__be64 a, __be64 b) 491{ 492 return (__force u64) a > (__force u64) b; 493} 494 495static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 496{ 497 struct rb_node **link = &cm.listen_service_table.rb_node; 498 struct rb_node *parent = NULL; 499 struct cm_id_private *cur_cm_id_priv; 500 __be64 service_id = cm_id_priv->id.service_id; 501 __be64 service_mask = cm_id_priv->id.service_mask; 502 int data_cmp; 503 504 while (*link) { 505 parent = *link; 506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 507 service_node); 508 data_cmp = cm_compare_data(cm_id_priv->compare_data, 509 cur_cm_id_priv->compare_data); 510 if ((cur_cm_id_priv->id.service_mask & service_id) == 511 (service_mask & cur_cm_id_priv->id.service_id) && 512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 513 !data_cmp) 514 return cur_cm_id_priv; 515 516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 517 link = &(*link)->rb_left; 518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 519 link = &(*link)->rb_right; 520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 521 link = &(*link)->rb_left; 522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 523 link = &(*link)->rb_right; 524 else if (data_cmp < 0) 525 link = &(*link)->rb_left; 526 else 527 link = &(*link)->rb_right; 528 } 529 rb_link_node(&cm_id_priv->service_node, parent, link); 530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 531 return NULL; 532} 533 534static struct cm_id_private * cm_find_listen(struct ib_device *device, 535 __be64 service_id, 536 u8 *private_data) 537{ 538 struct rb_node *node = cm.listen_service_table.rb_node; 539 struct cm_id_private *cm_id_priv; 540 int data_cmp; 541 542 while (node) { 543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 544 data_cmp = cm_compare_private_data(private_data, 545 cm_id_priv->compare_data); 546 if ((cm_id_priv->id.service_mask & service_id) == 547 cm_id_priv->id.service_id && 548 (cm_id_priv->id.device == device) && !data_cmp) 549 return cm_id_priv; 550 551 if (device < cm_id_priv->id.device) 552 node = node->rb_left; 553 else if (device > cm_id_priv->id.device) 554 node = node->rb_right; 555 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 556 node = node->rb_left; 557 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 558 node = node->rb_right; 559 else if (data_cmp < 0) 560 node = node->rb_left; 561 else 562 node = node->rb_right; 563 } 564 return NULL; 565} 566 567static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 568 *timewait_info) 569{ 570 struct rb_node **link = &cm.remote_id_table.rb_node; 571 struct rb_node *parent = NULL; 572 struct cm_timewait_info *cur_timewait_info; 573 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 574 __be32 remote_id = timewait_info->work.remote_id; 575 576 while (*link) { 577 parent = *link; 578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 579 remote_id_node); 580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 581 link = &(*link)->rb_left; 582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 583 link = &(*link)->rb_right; 584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 585 link = &(*link)->rb_left; 586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 587 link = &(*link)->rb_right; 588 else 589 return cur_timewait_info; 590 } 591 timewait_info->inserted_remote_id = 1; 592 rb_link_node(&timewait_info->remote_id_node, parent, link); 593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 594 return NULL; 595} 596 597static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 598 __be32 remote_id) 599{ 600 struct rb_node *node = cm.remote_id_table.rb_node; 601 struct cm_timewait_info *timewait_info; 602 603 while (node) { 604 timewait_info = rb_entry(node, struct cm_timewait_info, 605 remote_id_node); 606 if (be32_lt(remote_id, timewait_info->work.remote_id)) 607 node = node->rb_left; 608 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 609 node = node->rb_right; 610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 611 node = node->rb_left; 612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 613 node = node->rb_right; 614 else 615 return timewait_info; 616 } 617 return NULL; 618} 619 620static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 621 *timewait_info) 622{ 623 struct rb_node **link = &cm.remote_qp_table.rb_node; 624 struct rb_node *parent = NULL; 625 struct cm_timewait_info *cur_timewait_info; 626 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 627 __be32 remote_qpn = timewait_info->remote_qpn; 628 629 while (*link) { 630 parent = *link; 631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 632 remote_qp_node); 633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 634 link = &(*link)->rb_left; 635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 636 link = &(*link)->rb_right; 637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 638 link = &(*link)->rb_left; 639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 640 link = &(*link)->rb_right; 641 else 642 return cur_timewait_info; 643 } 644 timewait_info->inserted_remote_qp = 1; 645 rb_link_node(&timewait_info->remote_qp_node, parent, link); 646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 647 return NULL; 648} 649 650static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 651 *cm_id_priv) 652{ 653 struct rb_node **link = &cm.remote_sidr_table.rb_node; 654 struct rb_node *parent = NULL; 655 struct cm_id_private *cur_cm_id_priv; 656 union ib_gid *port_gid = &cm_id_priv->av.dgid; 657 __be32 remote_id = cm_id_priv->id.remote_id; 658 659 while (*link) { 660 parent = *link; 661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 662 sidr_id_node); 663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 664 link = &(*link)->rb_left; 665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 666 link = &(*link)->rb_right; 667 else { 668 int cmp; 669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 670 sizeof *port_gid); 671 if (cmp < 0) 672 link = &(*link)->rb_left; 673 else if (cmp > 0) 674 link = &(*link)->rb_right; 675 else 676 return cur_cm_id_priv; 677 } 678 } 679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 681 return NULL; 682} 683 684static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 685 enum ib_cm_sidr_status status) 686{ 687 struct ib_cm_sidr_rep_param param; 688 689 memset(¶m, 0, sizeof param); 690 param.status = status; 691 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 692} 693 694struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 695 ib_cm_handler cm_handler, 696 void *context) 697{ 698 struct cm_id_private *cm_id_priv; 699 int ret; 700 701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 702 if (!cm_id_priv) 703 return ERR_PTR(-ENOMEM); 704 705 cm_id_priv->id.state = IB_CM_IDLE; 706 cm_id_priv->id.device = device; 707 cm_id_priv->id.cm_handler = cm_handler; 708 cm_id_priv->id.context = context; 709 cm_id_priv->id.remote_cm_qpn = 1; 710 ret = cm_alloc_id(cm_id_priv); 711 if (ret) 712 goto error; 713 714 spin_lock_init(&cm_id_priv->lock); 715 init_completion(&cm_id_priv->comp); 716 INIT_LIST_HEAD(&cm_id_priv->work_list); 717 atomic_set(&cm_id_priv->work_count, -1); 718 atomic_set(&cm_id_priv->refcount, 1); 719 return &cm_id_priv->id; 720 721error: 722 kfree(cm_id_priv); 723 return ERR_PTR(-ENOMEM); 724} 725EXPORT_SYMBOL(ib_create_cm_id); 726 727static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 728{ 729 struct cm_work *work; 730 731 if (list_empty(&cm_id_priv->work_list)) 732 return NULL; 733 734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 735 list_del(&work->list); 736 return work; 737} 738 739static void cm_free_work(struct cm_work *work) 740{ 741 if (work->mad_recv_wc) 742 ib_free_recv_mad(work->mad_recv_wc); 743 kfree(work); 744} 745 746static inline int cm_convert_to_ms(int iba_time) 747{ 748 /* approximate conversion to ms from 4.096us x 2^iba_time */ 749 return 1 << max(iba_time - 8, 0); 750} 751 752/* 753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 754 * Because of how ack_timeout is stored, adding one doubles the timeout. 755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 756 * increment it (round up) only if the other is within 50%. 757 */ 758static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 759{ 760 int ack_timeout = packet_life_time + 1; 761 762 if (ack_timeout >= ca_ack_delay) 763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 764 else 765 ack_timeout = ca_ack_delay + 766 (ack_timeout >= (ca_ack_delay - 1)); 767 768 return min(31, ack_timeout); 769} 770 771static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 772{ 773 if (timewait_info->inserted_remote_id) { 774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 775 timewait_info->inserted_remote_id = 0; 776 } 777 778 if (timewait_info->inserted_remote_qp) { 779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 780 timewait_info->inserted_remote_qp = 0; 781 } 782} 783 784static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 785{ 786 struct cm_timewait_info *timewait_info; 787 788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 789 if (!timewait_info) 790 return ERR_PTR(-ENOMEM); 791 792 timewait_info->work.local_id = local_id; 793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 795 return timewait_info; 796} 797 798static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 799{ 800 int wait_time; 801 unsigned long flags; 802 803 spin_lock_irqsave(&cm.lock, flags); 804 cm_cleanup_timewait(cm_id_priv->timewait_info); 805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 806 spin_unlock_irqrestore(&cm.lock, flags); 807 808 /* 809 * The cm_id could be destroyed by the user before we exit timewait. 810 * To protect against this, we search for the cm_id after exiting 811 * timewait before notifying the user that we've exited timewait. 812 */ 813 cm_id_priv->id.state = IB_CM_TIMEWAIT; 814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 816 msecs_to_jiffies(wait_time)); 817 cm_id_priv->timewait_info = NULL; 818} 819 820static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 821{ 822 unsigned long flags; 823 824 cm_id_priv->id.state = IB_CM_IDLE; 825 if (cm_id_priv->timewait_info) { 826 spin_lock_irqsave(&cm.lock, flags); 827 cm_cleanup_timewait(cm_id_priv->timewait_info); 828 spin_unlock_irqrestore(&cm.lock, flags); 829 kfree(cm_id_priv->timewait_info); 830 cm_id_priv->timewait_info = NULL; 831 } 832} 833 834static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 835{ 836 struct cm_id_private *cm_id_priv; 837 struct cm_work *work; 838 839 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 840retest: 841 spin_lock_irq(&cm_id_priv->lock); 842 switch (cm_id->state) { 843 case IB_CM_LISTEN: 844 cm_id->state = IB_CM_IDLE; 845 spin_unlock_irq(&cm_id_priv->lock); 846 spin_lock_irq(&cm.lock); 847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 848 spin_unlock_irq(&cm.lock); 849 break; 850 case IB_CM_SIDR_REQ_SENT: 851 cm_id->state = IB_CM_IDLE; 852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 853 spin_unlock_irq(&cm_id_priv->lock); 854 break; 855 case IB_CM_SIDR_REQ_RCVD: 856 spin_unlock_irq(&cm_id_priv->lock); 857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 858 break; 859 case IB_CM_REQ_SENT: 860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 861 spin_unlock_irq(&cm_id_priv->lock); 862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 863 &cm_id_priv->id.device->node_guid, 864 sizeof cm_id_priv->id.device->node_guid, 865 NULL, 0); 866 break; 867 case IB_CM_REQ_RCVD: 868 if (err == -ENOMEM) { 869 /* Do not reject to allow future retries. */ 870 cm_reset_to_idle(cm_id_priv); 871 spin_unlock_irq(&cm_id_priv->lock); 872 } else { 873 spin_unlock_irq(&cm_id_priv->lock); 874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 875 NULL, 0, NULL, 0); 876 } 877 break; 878 case IB_CM_MRA_REQ_RCVD: 879 case IB_CM_REP_SENT: 880 case IB_CM_MRA_REP_RCVD: 881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 882 /* Fall through */ 883 case IB_CM_MRA_REQ_SENT: 884 case IB_CM_REP_RCVD: 885 case IB_CM_MRA_REP_SENT: 886 spin_unlock_irq(&cm_id_priv->lock); 887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 888 NULL, 0, NULL, 0); 889 break; 890 case IB_CM_ESTABLISHED: 891 spin_unlock_irq(&cm_id_priv->lock); 892 ib_send_cm_dreq(cm_id, NULL, 0); 893 goto retest; 894 case IB_CM_DREQ_SENT: 895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 896 cm_enter_timewait(cm_id_priv); 897 spin_unlock_irq(&cm_id_priv->lock); 898 break; 899 case IB_CM_DREQ_RCVD: 900 spin_unlock_irq(&cm_id_priv->lock); 901 ib_send_cm_drep(cm_id, NULL, 0); 902 break; 903 default: 904 spin_unlock_irq(&cm_id_priv->lock); 905 break; 906 } 907 908 cm_free_id(cm_id->local_id); 909 cm_deref_id(cm_id_priv); 910 wait_for_completion(&cm_id_priv->comp); 911 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 912 cm_free_work(work); 913 kfree(cm_id_priv->compare_data); 914 kfree(cm_id_priv->private_data); 915 kfree(cm_id_priv); 916} 917 918void ib_destroy_cm_id(struct ib_cm_id *cm_id) 919{ 920 cm_destroy_id(cm_id, 0); 921} 922EXPORT_SYMBOL(ib_destroy_cm_id); 923 924int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 925 struct ib_cm_compare_data *compare_data) 926{ 927 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 928 unsigned long flags; 929 int ret = 0; 930 931 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 932 service_id &= service_mask; 933 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 934 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 935 return -EINVAL; 936 937 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 938 if (cm_id->state != IB_CM_IDLE) 939 return -EINVAL; 940 941 if (compare_data) { 942 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 943 GFP_KERNEL); 944 if (!cm_id_priv->compare_data) 945 return -ENOMEM; 946 cm_mask_copy(cm_id_priv->compare_data->data, 947 compare_data->data, compare_data->mask); 948 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 949 IB_CM_COMPARE_SIZE); 950 } 951 952 cm_id->state = IB_CM_LISTEN; 953 954 spin_lock_irqsave(&cm.lock, flags); 955 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 956 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 957 cm_id->service_mask = ~cpu_to_be64(0); 958 } else { 959 cm_id->service_id = service_id; 960 cm_id->service_mask = service_mask; 961 } 962 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 963 spin_unlock_irqrestore(&cm.lock, flags); 964 965 if (cur_cm_id_priv) { 966 cm_id->state = IB_CM_IDLE; 967 kfree(cm_id_priv->compare_data); 968 cm_id_priv->compare_data = NULL; 969 ret = -EBUSY; 970 } 971 return ret; 972} 973EXPORT_SYMBOL(ib_cm_listen); 974 975static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 976 enum cm_msg_sequence msg_seq) 977{ 978 u64 hi_tid, low_tid; 979 980 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 981 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 982 (msg_seq << 30)); 983 return cpu_to_be64(hi_tid | low_tid); 984} 985 986static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 987 __be16 attr_id, __be64 tid) 988{ 989 hdr->base_version = IB_MGMT_BASE_VERSION; 990 hdr->mgmt_class = IB_MGMT_CLASS_CM; 991 hdr->class_version = IB_CM_CLASS_VERSION; 992 hdr->method = IB_MGMT_METHOD_SEND; 993 hdr->attr_id = attr_id; 994 hdr->tid = tid; 995} 996 997static void cm_format_req(struct cm_req_msg *req_msg, 998 struct cm_id_private *cm_id_priv, 999 struct ib_cm_req_param *param) 1000{ 1001 struct ib_sa_path_rec *pri_path = param->primary_path; 1002 struct ib_sa_path_rec *alt_path = param->alternate_path; 1003 1004 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1005 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1006 1007 req_msg->local_comm_id = cm_id_priv->id.local_id; 1008 req_msg->service_id = param->service_id; 1009 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1010 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1011 cm_req_set_init_depth(req_msg, param->initiator_depth); 1012 cm_req_set_remote_resp_timeout(req_msg, 1013 param->remote_cm_response_timeout); 1014 cm_req_set_qp_type(req_msg, param->qp_type); 1015 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1016 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1017 cm_req_set_local_resp_timeout(req_msg, 1018 param->local_cm_response_timeout); 1019 req_msg->pkey = param->primary_path->pkey; 1020 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1021 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1022 1023 if (param->qp_type != IB_QPT_XRC_INI) { 1024 cm_req_set_resp_res(req_msg, param->responder_resources); 1025 cm_req_set_retry_count(req_msg, param->retry_count); 1026 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1027 cm_req_set_srq(req_msg, param->srq); 1028 } 1029 1030 if (pri_path->hop_limit <= 1) { 1031 req_msg->primary_local_lid = pri_path->slid; 1032 req_msg->primary_remote_lid = pri_path->dlid; 1033 } else { 1034 /* Work-around until there's a way to obtain remote LID info */ 1035 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1036 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1037 } 1038 req_msg->primary_local_gid = pri_path->sgid; 1039 req_msg->primary_remote_gid = pri_path->dgid; 1040 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1041 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1042 req_msg->primary_traffic_class = pri_path->traffic_class; 1043 req_msg->primary_hop_limit = pri_path->hop_limit; 1044 cm_req_set_primary_sl(req_msg, pri_path->sl); 1045 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1046 cm_req_set_primary_local_ack_timeout(req_msg, 1047 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1048 pri_path->packet_life_time)); 1049 1050 if (alt_path) { 1051 if (alt_path->hop_limit <= 1) { 1052 req_msg->alt_local_lid = alt_path->slid; 1053 req_msg->alt_remote_lid = alt_path->dlid; 1054 } else { 1055 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1056 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1057 } 1058 req_msg->alt_local_gid = alt_path->sgid; 1059 req_msg->alt_remote_gid = alt_path->dgid; 1060 cm_req_set_alt_flow_label(req_msg, 1061 alt_path->flow_label); 1062 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1063 req_msg->alt_traffic_class = alt_path->traffic_class; 1064 req_msg->alt_hop_limit = alt_path->hop_limit; 1065 cm_req_set_alt_sl(req_msg, alt_path->sl); 1066 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1067 cm_req_set_alt_local_ack_timeout(req_msg, 1068 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1069 alt_path->packet_life_time)); 1070 } 1071 1072 if (param->private_data && param->private_data_len) 1073 memcpy(req_msg->private_data, param->private_data, 1074 param->private_data_len); 1075} 1076 1077static int cm_validate_req_param(struct ib_cm_req_param *param) 1078{ 1079 /* peer-to-peer not supported */ 1080 if (param->peer_to_peer) 1081 return -EINVAL; 1082 1083 if (!param->primary_path) 1084 return -EINVAL; 1085 1086 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1087 param->qp_type != IB_QPT_XRC_INI) 1088 return -EINVAL; 1089 1090 if (param->private_data && 1091 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1092 return -EINVAL; 1093 1094 if (param->alternate_path && 1095 (param->alternate_path->pkey != param->primary_path->pkey || 1096 param->alternate_path->mtu != param->primary_path->mtu)) 1097 return -EINVAL; 1098 1099 return 0; 1100} 1101 1102int ib_send_cm_req(struct ib_cm_id *cm_id, 1103 struct ib_cm_req_param *param) 1104{ 1105 struct cm_id_private *cm_id_priv; 1106 struct cm_req_msg *req_msg; 1107 unsigned long flags; 1108 int ret; 1109 1110 ret = cm_validate_req_param(param); 1111 if (ret) 1112 return ret; 1113 1114 /* Verify that we're not in timewait. */ 1115 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1116 spin_lock_irqsave(&cm_id_priv->lock, flags); 1117 if (cm_id->state != IB_CM_IDLE) { 1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1119 ret = -EINVAL; 1120 goto out; 1121 } 1122 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1123 1124 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1125 id.local_id); 1126 if (IS_ERR(cm_id_priv->timewait_info)) { 1127 ret = PTR_ERR(cm_id_priv->timewait_info); 1128 goto out; 1129 } 1130 1131 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1132 if (ret) 1133 goto error1; 1134 if (param->alternate_path) { 1135 ret = cm_init_av_by_path(param->alternate_path, 1136 &cm_id_priv->alt_av); 1137 if (ret) 1138 goto error1; 1139 } 1140 cm_id->service_id = param->service_id; 1141 cm_id->service_mask = ~cpu_to_be64(0); 1142 cm_id_priv->timeout_ms = cm_convert_to_ms( 1143 param->primary_path->packet_life_time) * 2 + 1144 cm_convert_to_ms( 1145 param->remote_cm_response_timeout); 1146 cm_id_priv->max_cm_retries = param->max_cm_retries; 1147 cm_id_priv->initiator_depth = param->initiator_depth; 1148 cm_id_priv->responder_resources = param->responder_resources; 1149 cm_id_priv->retry_count = param->retry_count; 1150 cm_id_priv->path_mtu = param->primary_path->mtu; 1151 cm_id_priv->pkey = param->primary_path->pkey; 1152 cm_id_priv->qp_type = param->qp_type; 1153 1154 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1155 if (ret) 1156 goto error1; 1157 1158 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1159 cm_format_req(req_msg, cm_id_priv, param); 1160 cm_id_priv->tid = req_msg->hdr.tid; 1161 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1162 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1163 1164 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1165 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1166 1167 spin_lock_irqsave(&cm_id_priv->lock, flags); 1168 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1169 if (ret) { 1170 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1171 goto error2; 1172 } 1173 BUG_ON(cm_id->state != IB_CM_IDLE); 1174 cm_id->state = IB_CM_REQ_SENT; 1175 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1176 return 0; 1177 1178error2: cm_free_msg(cm_id_priv->msg); 1179error1: kfree(cm_id_priv->timewait_info); 1180out: return ret; 1181} 1182EXPORT_SYMBOL(ib_send_cm_req); 1183 1184static int cm_issue_rej(struct cm_port *port, 1185 struct ib_mad_recv_wc *mad_recv_wc, 1186 enum ib_cm_rej_reason reason, 1187 enum cm_msg_response msg_rejected, 1188 void *ari, u8 ari_length) 1189{ 1190 struct ib_mad_send_buf *msg = NULL; 1191 struct cm_rej_msg *rej_msg, *rcv_msg; 1192 int ret; 1193 1194 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1195 if (ret) 1196 return ret; 1197 1198 /* We just need common CM header information. Cast to any message. */ 1199 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1200 rej_msg = (struct cm_rej_msg *) msg->mad; 1201 1202 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1203 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1204 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1205 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1206 rej_msg->reason = cpu_to_be16(reason); 1207 1208 if (ari && ari_length) { 1209 cm_rej_set_reject_info_len(rej_msg, ari_length); 1210 memcpy(rej_msg->ari, ari, ari_length); 1211 } 1212 1213 ret = ib_post_send_mad(msg, NULL); 1214 if (ret) 1215 cm_free_msg(msg); 1216 1217 return ret; 1218} 1219 1220static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1221 __be32 local_qpn, __be32 remote_qpn) 1222{ 1223 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1224 ((local_ca_guid == remote_ca_guid) && 1225 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1226} 1227 1228static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1229 struct ib_sa_path_rec *primary_path, 1230 struct ib_sa_path_rec *alt_path) 1231{ 1232 memset(primary_path, 0, sizeof *primary_path); 1233 primary_path->dgid = req_msg->primary_local_gid; 1234 primary_path->sgid = req_msg->primary_remote_gid; 1235 primary_path->dlid = req_msg->primary_local_lid; 1236 primary_path->slid = req_msg->primary_remote_lid; 1237 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1238 primary_path->hop_limit = req_msg->primary_hop_limit; 1239 primary_path->traffic_class = req_msg->primary_traffic_class; 1240 primary_path->reversible = 1; 1241 primary_path->pkey = req_msg->pkey; 1242 primary_path->sl = cm_req_get_primary_sl(req_msg); 1243 primary_path->mtu_selector = IB_SA_EQ; 1244 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1245 primary_path->rate_selector = IB_SA_EQ; 1246 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1247 primary_path->packet_life_time_selector = IB_SA_EQ; 1248 primary_path->packet_life_time = 1249 cm_req_get_primary_local_ack_timeout(req_msg); 1250 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1251 1252 if (req_msg->alt_local_lid) { 1253 memset(alt_path, 0, sizeof *alt_path); 1254 alt_path->dgid = req_msg->alt_local_gid; 1255 alt_path->sgid = req_msg->alt_remote_gid; 1256 alt_path->dlid = req_msg->alt_local_lid; 1257 alt_path->slid = req_msg->alt_remote_lid; 1258 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1259 alt_path->hop_limit = req_msg->alt_hop_limit; 1260 alt_path->traffic_class = req_msg->alt_traffic_class; 1261 alt_path->reversible = 1; 1262 alt_path->pkey = req_msg->pkey; 1263 alt_path->sl = cm_req_get_alt_sl(req_msg); 1264 alt_path->mtu_selector = IB_SA_EQ; 1265 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1266 alt_path->rate_selector = IB_SA_EQ; 1267 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1268 alt_path->packet_life_time_selector = IB_SA_EQ; 1269 alt_path->packet_life_time = 1270 cm_req_get_alt_local_ack_timeout(req_msg); 1271 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1272 } 1273} 1274 1275static void cm_format_req_event(struct cm_work *work, 1276 struct cm_id_private *cm_id_priv, 1277 struct ib_cm_id *listen_id) 1278{ 1279 struct cm_req_msg *req_msg; 1280 struct ib_cm_req_event_param *param; 1281 1282 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1283 param = &work->cm_event.param.req_rcvd; 1284 param->listen_id = listen_id; 1285 param->port = cm_id_priv->av.port->port_num; 1286 param->primary_path = &work->path[0]; 1287 if (req_msg->alt_local_lid) 1288 param->alternate_path = &work->path[1]; 1289 else 1290 param->alternate_path = NULL; 1291 param->remote_ca_guid = req_msg->local_ca_guid; 1292 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1293 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1294 param->qp_type = cm_req_get_qp_type(req_msg); 1295 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1296 param->responder_resources = cm_req_get_init_depth(req_msg); 1297 param->initiator_depth = cm_req_get_resp_res(req_msg); 1298 param->local_cm_response_timeout = 1299 cm_req_get_remote_resp_timeout(req_msg); 1300 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1301 param->remote_cm_response_timeout = 1302 cm_req_get_local_resp_timeout(req_msg); 1303 param->retry_count = cm_req_get_retry_count(req_msg); 1304 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1305 param->srq = cm_req_get_srq(req_msg); 1306 work->cm_event.private_data = &req_msg->private_data; 1307} 1308 1309static void cm_process_work(struct cm_id_private *cm_id_priv, 1310 struct cm_work *work) 1311{ 1312 int ret; 1313 1314 /* We will typically only have the current event to report. */ 1315 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1316 cm_free_work(work); 1317 1318 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1319 spin_lock_irq(&cm_id_priv->lock); 1320 work = cm_dequeue_work(cm_id_priv); 1321 spin_unlock_irq(&cm_id_priv->lock); 1322 BUG_ON(!work); 1323 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1324 &work->cm_event); 1325 cm_free_work(work); 1326 } 1327 cm_deref_id(cm_id_priv); 1328 if (ret) 1329 cm_destroy_id(&cm_id_priv->id, ret); 1330} 1331 1332static void cm_format_mra(struct cm_mra_msg *mra_msg, 1333 struct cm_id_private *cm_id_priv, 1334 enum cm_msg_response msg_mraed, u8 service_timeout, 1335 const void *private_data, u8 private_data_len) 1336{ 1337 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1338 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1339 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1340 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1341 cm_mra_set_service_timeout(mra_msg, service_timeout); 1342 1343 if (private_data && private_data_len) 1344 memcpy(mra_msg->private_data, private_data, private_data_len); 1345} 1346 1347static void cm_format_rej(struct cm_rej_msg *rej_msg, 1348 struct cm_id_private *cm_id_priv, 1349 enum ib_cm_rej_reason reason, 1350 void *ari, 1351 u8 ari_length, 1352 const void *private_data, 1353 u8 private_data_len) 1354{ 1355 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1356 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1357 1358 switch(cm_id_priv->id.state) { 1359 case IB_CM_REQ_RCVD: 1360 rej_msg->local_comm_id = 0; 1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1362 break; 1363 case IB_CM_MRA_REQ_SENT: 1364 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1365 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1366 break; 1367 case IB_CM_REP_RCVD: 1368 case IB_CM_MRA_REP_SENT: 1369 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1371 break; 1372 default: 1373 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1374 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1375 break; 1376 } 1377 1378 rej_msg->reason = cpu_to_be16(reason); 1379 if (ari && ari_length) { 1380 cm_rej_set_reject_info_len(rej_msg, ari_length); 1381 memcpy(rej_msg->ari, ari, ari_length); 1382 } 1383 1384 if (private_data && private_data_len) 1385 memcpy(rej_msg->private_data, private_data, private_data_len); 1386} 1387 1388static void cm_dup_req_handler(struct cm_work *work, 1389 struct cm_id_private *cm_id_priv) 1390{ 1391 struct ib_mad_send_buf *msg = NULL; 1392 int ret; 1393 1394 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1395 counter[CM_REQ_COUNTER]); 1396 1397 /* Quick state check to discard duplicate REQs. */ 1398 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1399 return; 1400 1401 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1402 if (ret) 1403 return; 1404 1405 spin_lock_irq(&cm_id_priv->lock); 1406 switch (cm_id_priv->id.state) { 1407 case IB_CM_MRA_REQ_SENT: 1408 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1409 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1410 cm_id_priv->private_data, 1411 cm_id_priv->private_data_len); 1412 break; 1413 case IB_CM_TIMEWAIT: 1414 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1415 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1416 break; 1417 default: 1418 goto unlock; 1419 } 1420 spin_unlock_irq(&cm_id_priv->lock); 1421 1422 ret = ib_post_send_mad(msg, NULL); 1423 if (ret) 1424 goto free; 1425 return; 1426 1427unlock: spin_unlock_irq(&cm_id_priv->lock); 1428free: cm_free_msg(msg); 1429} 1430 1431static struct cm_id_private * cm_match_req(struct cm_work *work, 1432 struct cm_id_private *cm_id_priv) 1433{ 1434 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1435 struct cm_timewait_info *timewait_info; 1436 struct cm_req_msg *req_msg; 1437 1438 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1439 1440 /* Check for possible duplicate REQ. */ 1441 spin_lock_irq(&cm.lock); 1442 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1443 if (timewait_info) { 1444 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1445 timewait_info->work.remote_id); 1446 spin_unlock_irq(&cm.lock); 1447 if (cur_cm_id_priv) { 1448 cm_dup_req_handler(work, cur_cm_id_priv); 1449 cm_deref_id(cur_cm_id_priv); 1450 } 1451 return NULL; 1452 } 1453 1454 /* Check for stale connections. */ 1455 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1456 if (timewait_info) { 1457 cm_cleanup_timewait(cm_id_priv->timewait_info); 1458 spin_unlock_irq(&cm.lock); 1459 cm_issue_rej(work->port, work->mad_recv_wc, 1460 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1461 NULL, 0); 1462 return NULL; 1463 } 1464 1465 /* Find matching listen request. */ 1466 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1467 req_msg->service_id, 1468 req_msg->private_data); 1469 if (!listen_cm_id_priv) { 1470 cm_cleanup_timewait(cm_id_priv->timewait_info); 1471 spin_unlock_irq(&cm.lock); 1472 cm_issue_rej(work->port, work->mad_recv_wc, 1473 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1474 NULL, 0); 1475 goto out; 1476 } 1477 atomic_inc(&listen_cm_id_priv->refcount); 1478 atomic_inc(&cm_id_priv->refcount); 1479 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1480 atomic_inc(&cm_id_priv->work_count); 1481 spin_unlock_irq(&cm.lock); 1482out: 1483 return listen_cm_id_priv; 1484} 1485 1486/* 1487 * Work-around for inter-subnet connections. If the LIDs are permissive, 1488 * we need to override the LID/SL data in the REQ with the LID information 1489 * in the work completion. 1490 */ 1491static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1492{ 1493 if (!cm_req_get_primary_subnet_local(req_msg)) { 1494 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1495 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1496 cm_req_set_primary_sl(req_msg, wc->sl); 1497 } 1498 1499 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1500 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1501 } 1502 1503 if (!cm_req_get_alt_subnet_local(req_msg)) { 1504 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1505 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1506 cm_req_set_alt_sl(req_msg, wc->sl); 1507 } 1508 1509 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1510 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1511 } 1512} 1513 1514static int cm_req_handler(struct cm_work *work) 1515{ 1516 struct ib_cm_id *cm_id; 1517 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1518 struct cm_req_msg *req_msg; 1519 int ret; 1520 1521 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1522 1523 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1524 if (IS_ERR(cm_id)) 1525 return PTR_ERR(cm_id); 1526 1527 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1528 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1529 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1530 work->mad_recv_wc->recv_buf.grh, 1531 &cm_id_priv->av); 1532 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1533 id.local_id); 1534 if (IS_ERR(cm_id_priv->timewait_info)) { 1535 ret = PTR_ERR(cm_id_priv->timewait_info); 1536 goto destroy; 1537 } 1538 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1539 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1540 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1541 1542 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1543 if (!listen_cm_id_priv) { 1544 ret = -EINVAL; 1545 kfree(cm_id_priv->timewait_info); 1546 goto destroy; 1547 } 1548 1549 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1550 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1551 cm_id_priv->id.service_id = req_msg->service_id; 1552 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1553 1554 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1555 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1556 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1557 if (ret) { 1558 ib_get_cached_gid(work->port->cm_dev->ib_device, 1559 work->port->port_num, 0, &work->path[0].sgid); 1560 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1561 &work->path[0].sgid, sizeof work->path[0].sgid, 1562 NULL, 0); 1563 goto rejected; 1564 } 1565 if (req_msg->alt_local_lid) { 1566 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1567 if (ret) { 1568 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1569 &work->path[0].sgid, 1570 sizeof work->path[0].sgid, NULL, 0); 1571 goto rejected; 1572 } 1573 } 1574 cm_id_priv->tid = req_msg->hdr.tid; 1575 cm_id_priv->timeout_ms = cm_convert_to_ms( 1576 cm_req_get_local_resp_timeout(req_msg)); 1577 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1578 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1579 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1580 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1581 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1582 cm_id_priv->pkey = req_msg->pkey; 1583 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1584 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1585 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1586 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1587 1588 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1589 cm_process_work(cm_id_priv, work); 1590 cm_deref_id(listen_cm_id_priv); 1591 return 0; 1592 1593rejected: 1594 atomic_dec(&cm_id_priv->refcount); 1595 cm_deref_id(listen_cm_id_priv); 1596destroy: 1597 ib_destroy_cm_id(cm_id); 1598 return ret; 1599} 1600 1601static void cm_format_rep(struct cm_rep_msg *rep_msg, 1602 struct cm_id_private *cm_id_priv, 1603 struct ib_cm_rep_param *param) 1604{ 1605 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1606 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1607 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1608 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1609 rep_msg->resp_resources = param->responder_resources; 1610 cm_rep_set_target_ack_delay(rep_msg, 1611 cm_id_priv->av.port->cm_dev->ack_delay); 1612 cm_rep_set_failover(rep_msg, param->failover_accepted); 1613 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1615 1616 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1617 rep_msg->initiator_depth = param->initiator_depth; 1618 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1619 cm_rep_set_srq(rep_msg, param->srq); 1620 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1621 } else { 1622 cm_rep_set_srq(rep_msg, 1); 1623 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1624 } 1625 1626 if (param->private_data && param->private_data_len) 1627 memcpy(rep_msg->private_data, param->private_data, 1628 param->private_data_len); 1629} 1630 1631int ib_send_cm_rep(struct ib_cm_id *cm_id, 1632 struct ib_cm_rep_param *param) 1633{ 1634 struct cm_id_private *cm_id_priv; 1635 struct ib_mad_send_buf *msg; 1636 struct cm_rep_msg *rep_msg; 1637 unsigned long flags; 1638 int ret; 1639 1640 if (param->private_data && 1641 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1642 return -EINVAL; 1643 1644 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1645 spin_lock_irqsave(&cm_id_priv->lock, flags); 1646 if (cm_id->state != IB_CM_REQ_RCVD && 1647 cm_id->state != IB_CM_MRA_REQ_SENT) { 1648 ret = -EINVAL; 1649 goto out; 1650 } 1651 1652 ret = cm_alloc_msg(cm_id_priv, &msg); 1653 if (ret) 1654 goto out; 1655 1656 rep_msg = (struct cm_rep_msg *) msg->mad; 1657 cm_format_rep(rep_msg, cm_id_priv, param); 1658 msg->timeout_ms = cm_id_priv->timeout_ms; 1659 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1660 1661 ret = ib_post_send_mad(msg, NULL); 1662 if (ret) { 1663 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1664 cm_free_msg(msg); 1665 return ret; 1666 } 1667 1668 cm_id->state = IB_CM_REP_SENT; 1669 cm_id_priv->msg = msg; 1670 cm_id_priv->initiator_depth = param->initiator_depth; 1671 cm_id_priv->responder_resources = param->responder_resources; 1672 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1673 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1674 1675out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1676 return ret; 1677} 1678EXPORT_SYMBOL(ib_send_cm_rep); 1679 1680static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1681 struct cm_id_private *cm_id_priv, 1682 const void *private_data, 1683 u8 private_data_len) 1684{ 1685 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1686 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1687 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1688 1689 if (private_data && private_data_len) 1690 memcpy(rtu_msg->private_data, private_data, private_data_len); 1691} 1692 1693int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1694 const void *private_data, 1695 u8 private_data_len) 1696{ 1697 struct cm_id_private *cm_id_priv; 1698 struct ib_mad_send_buf *msg; 1699 unsigned long flags; 1700 void *data; 1701 int ret; 1702 1703 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1704 return -EINVAL; 1705 1706 data = cm_copy_private_data(private_data, private_data_len); 1707 if (IS_ERR(data)) 1708 return PTR_ERR(data); 1709 1710 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1711 spin_lock_irqsave(&cm_id_priv->lock, flags); 1712 if (cm_id->state != IB_CM_REP_RCVD && 1713 cm_id->state != IB_CM_MRA_REP_SENT) { 1714 ret = -EINVAL; 1715 goto error; 1716 } 1717 1718 ret = cm_alloc_msg(cm_id_priv, &msg); 1719 if (ret) 1720 goto error; 1721 1722 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1723 private_data, private_data_len); 1724 1725 ret = ib_post_send_mad(msg, NULL); 1726 if (ret) { 1727 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1728 cm_free_msg(msg); 1729 kfree(data); 1730 return ret; 1731 } 1732 1733 cm_id->state = IB_CM_ESTABLISHED; 1734 cm_set_private_data(cm_id_priv, data, private_data_len); 1735 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1736 return 0; 1737 1738error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1739 kfree(data); 1740 return ret; 1741} 1742EXPORT_SYMBOL(ib_send_cm_rtu); 1743 1744static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1745{ 1746 struct cm_rep_msg *rep_msg; 1747 struct ib_cm_rep_event_param *param; 1748 1749 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1750 param = &work->cm_event.param.rep_rcvd; 1751 param->remote_ca_guid = rep_msg->local_ca_guid; 1752 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1753 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1754 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1755 param->responder_resources = rep_msg->initiator_depth; 1756 param->initiator_depth = rep_msg->resp_resources; 1757 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1758 param->failover_accepted = cm_rep_get_failover(rep_msg); 1759 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1760 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1761 param->srq = cm_rep_get_srq(rep_msg); 1762 work->cm_event.private_data = &rep_msg->private_data; 1763} 1764 1765static void cm_dup_rep_handler(struct cm_work *work) 1766{ 1767 struct cm_id_private *cm_id_priv; 1768 struct cm_rep_msg *rep_msg; 1769 struct ib_mad_send_buf *msg = NULL; 1770 int ret; 1771 1772 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1773 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1774 rep_msg->local_comm_id); 1775 if (!cm_id_priv) 1776 return; 1777 1778 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1779 counter[CM_REP_COUNTER]); 1780 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1781 if (ret) 1782 goto deref; 1783 1784 spin_lock_irq(&cm_id_priv->lock); 1785 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1786 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1787 cm_id_priv->private_data, 1788 cm_id_priv->private_data_len); 1789 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1790 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1791 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1792 cm_id_priv->private_data, 1793 cm_id_priv->private_data_len); 1794 else 1795 goto unlock; 1796 spin_unlock_irq(&cm_id_priv->lock); 1797 1798 ret = ib_post_send_mad(msg, NULL); 1799 if (ret) 1800 goto free; 1801 goto deref; 1802 1803unlock: spin_unlock_irq(&cm_id_priv->lock); 1804free: cm_free_msg(msg); 1805deref: cm_deref_id(cm_id_priv); 1806} 1807 1808static int cm_rep_handler(struct cm_work *work) 1809{ 1810 struct cm_id_private *cm_id_priv; 1811 struct cm_rep_msg *rep_msg; 1812 int ret; 1813 1814 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1815 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1816 if (!cm_id_priv) { 1817 cm_dup_rep_handler(work); 1818 return -EINVAL; 1819 } 1820 1821 cm_format_rep_event(work, cm_id_priv->qp_type); 1822 1823 spin_lock_irq(&cm_id_priv->lock); 1824 switch (cm_id_priv->id.state) { 1825 case IB_CM_REQ_SENT: 1826 case IB_CM_MRA_REQ_RCVD: 1827 break; 1828 default: 1829 spin_unlock_irq(&cm_id_priv->lock); 1830 ret = -EINVAL; 1831 goto error; 1832 } 1833 1834 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1835 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1836 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1837 1838 spin_lock(&cm.lock); 1839 /* Check for duplicate REP. */ 1840 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1841 spin_unlock(&cm.lock); 1842 spin_unlock_irq(&cm_id_priv->lock); 1843 ret = -EINVAL; 1844 goto error; 1845 } 1846 /* Check for a stale connection. */ 1847 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1848 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1849 &cm.remote_id_table); 1850 cm_id_priv->timewait_info->inserted_remote_id = 0; 1851 spin_unlock(&cm.lock); 1852 spin_unlock_irq(&cm_id_priv->lock); 1853 cm_issue_rej(work->port, work->mad_recv_wc, 1854 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1855 NULL, 0); 1856 ret = -EINVAL; 1857 goto error; 1858 } 1859 spin_unlock(&cm.lock); 1860 1861 cm_id_priv->id.state = IB_CM_REP_RCVD; 1862 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1863 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1864 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1865 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1866 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1867 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1868 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1869 cm_id_priv->av.timeout = 1870 cm_ack_timeout(cm_id_priv->target_ack_delay, 1871 cm_id_priv->av.timeout - 1); 1872 cm_id_priv->alt_av.timeout = 1873 cm_ack_timeout(cm_id_priv->target_ack_delay, 1874 cm_id_priv->alt_av.timeout - 1); 1875 1876 /* todo: handle peer_to_peer */ 1877 1878 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1879 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1880 if (!ret) 1881 list_add_tail(&work->list, &cm_id_priv->work_list); 1882 spin_unlock_irq(&cm_id_priv->lock); 1883 1884 if (ret) 1885 cm_process_work(cm_id_priv, work); 1886 else 1887 cm_deref_id(cm_id_priv); 1888 return 0; 1889 1890error: 1891 cm_deref_id(cm_id_priv); 1892 return ret; 1893} 1894 1895static int cm_establish_handler(struct cm_work *work) 1896{ 1897 struct cm_id_private *cm_id_priv; 1898 int ret; 1899 1900 /* See comment in cm_establish about lookup. */ 1901 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1902 if (!cm_id_priv) 1903 return -EINVAL; 1904 1905 spin_lock_irq(&cm_id_priv->lock); 1906 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1907 spin_unlock_irq(&cm_id_priv->lock); 1908 goto out; 1909 } 1910 1911 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1912 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1913 if (!ret) 1914 list_add_tail(&work->list, &cm_id_priv->work_list); 1915 spin_unlock_irq(&cm_id_priv->lock); 1916 1917 if (ret) 1918 cm_process_work(cm_id_priv, work); 1919 else 1920 cm_deref_id(cm_id_priv); 1921 return 0; 1922out: 1923 cm_deref_id(cm_id_priv); 1924 return -EINVAL; 1925} 1926 1927static int cm_rtu_handler(struct cm_work *work) 1928{ 1929 struct cm_id_private *cm_id_priv; 1930 struct cm_rtu_msg *rtu_msg; 1931 int ret; 1932 1933 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1934 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1935 rtu_msg->local_comm_id); 1936 if (!cm_id_priv) 1937 return -EINVAL; 1938 1939 work->cm_event.private_data = &rtu_msg->private_data; 1940 1941 spin_lock_irq(&cm_id_priv->lock); 1942 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1943 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1944 spin_unlock_irq(&cm_id_priv->lock); 1945 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1946 counter[CM_RTU_COUNTER]); 1947 goto out; 1948 } 1949 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1950 1951 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1952 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1953 if (!ret) 1954 list_add_tail(&work->list, &cm_id_priv->work_list); 1955 spin_unlock_irq(&cm_id_priv->lock); 1956 1957 if (ret) 1958 cm_process_work(cm_id_priv, work); 1959 else 1960 cm_deref_id(cm_id_priv); 1961 return 0; 1962out: 1963 cm_deref_id(cm_id_priv); 1964 return -EINVAL; 1965} 1966 1967static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1968 struct cm_id_private *cm_id_priv, 1969 const void *private_data, 1970 u8 private_data_len) 1971{ 1972 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1973 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1974 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1975 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1976 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1977 1978 if (private_data && private_data_len) 1979 memcpy(dreq_msg->private_data, private_data, private_data_len); 1980} 1981 1982int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1983 const void *private_data, 1984 u8 private_data_len) 1985{ 1986 struct cm_id_private *cm_id_priv; 1987 struct ib_mad_send_buf *msg; 1988 unsigned long flags; 1989 int ret; 1990 1991 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1992 return -EINVAL; 1993 1994 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1995 spin_lock_irqsave(&cm_id_priv->lock, flags); 1996 if (cm_id->state != IB_CM_ESTABLISHED) { 1997 ret = -EINVAL; 1998 goto out; 1999 } 2000 2001 if (cm_id->lap_state == IB_CM_LAP_SENT || 2002 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2003 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2004 2005 ret = cm_alloc_msg(cm_id_priv, &msg); 2006 if (ret) { 2007 cm_enter_timewait(cm_id_priv); 2008 goto out; 2009 } 2010 2011 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2012 private_data, private_data_len); 2013 msg->timeout_ms = cm_id_priv->timeout_ms; 2014 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2015 2016 ret = ib_post_send_mad(msg, NULL); 2017 if (ret) { 2018 cm_enter_timewait(cm_id_priv); 2019 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2020 cm_free_msg(msg); 2021 return ret; 2022 } 2023 2024 cm_id->state = IB_CM_DREQ_SENT; 2025 cm_id_priv->msg = msg; 2026out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2027 return ret; 2028} 2029EXPORT_SYMBOL(ib_send_cm_dreq); 2030 2031static void cm_format_drep(struct cm_drep_msg *drep_msg, 2032 struct cm_id_private *cm_id_priv, 2033 const void *private_data, 2034 u8 private_data_len) 2035{ 2036 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2037 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2038 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2039 2040 if (private_data && private_data_len) 2041 memcpy(drep_msg->private_data, private_data, private_data_len); 2042} 2043 2044int ib_send_cm_drep(struct ib_cm_id *cm_id, 2045 const void *private_data, 2046 u8 private_data_len) 2047{ 2048 struct cm_id_private *cm_id_priv; 2049 struct ib_mad_send_buf *msg; 2050 unsigned long flags; 2051 void *data; 2052 int ret; 2053 2054 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2055 return -EINVAL; 2056 2057 data = cm_copy_private_data(private_data, private_data_len); 2058 if (IS_ERR(data)) 2059 return PTR_ERR(data); 2060 2061 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2062 spin_lock_irqsave(&cm_id_priv->lock, flags); 2063 if (cm_id->state != IB_CM_DREQ_RCVD) { 2064 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2065 kfree(data); 2066 return -EINVAL; 2067 } 2068 2069 cm_set_private_data(cm_id_priv, data, private_data_len); 2070 cm_enter_timewait(cm_id_priv); 2071 2072 ret = cm_alloc_msg(cm_id_priv, &msg); 2073 if (ret) 2074 goto out; 2075 2076 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2077 private_data, private_data_len); 2078 2079 ret = ib_post_send_mad(msg, NULL); 2080 if (ret) { 2081 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2082 cm_free_msg(msg); 2083 return ret; 2084 } 2085 2086out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2087 return ret; 2088} 2089EXPORT_SYMBOL(ib_send_cm_drep); 2090 2091static int cm_issue_drep(struct cm_port *port, 2092 struct ib_mad_recv_wc *mad_recv_wc) 2093{ 2094 struct ib_mad_send_buf *msg = NULL; 2095 struct cm_dreq_msg *dreq_msg; 2096 struct cm_drep_msg *drep_msg; 2097 int ret; 2098 2099 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2100 if (ret) 2101 return ret; 2102 2103 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2104 drep_msg = (struct cm_drep_msg *) msg->mad; 2105 2106 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2107 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2108 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2109 2110 ret = ib_post_send_mad(msg, NULL); 2111 if (ret) 2112 cm_free_msg(msg); 2113 2114 return ret; 2115} 2116 2117static int cm_dreq_handler(struct cm_work *work) 2118{ 2119 struct cm_id_private *cm_id_priv; 2120 struct cm_dreq_msg *dreq_msg; 2121 struct ib_mad_send_buf *msg = NULL; 2122 int ret; 2123 2124 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2125 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2126 dreq_msg->local_comm_id); 2127 if (!cm_id_priv) { 2128 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2129 counter[CM_DREQ_COUNTER]); 2130 cm_issue_drep(work->port, work->mad_recv_wc); 2131 return -EINVAL; 2132 } 2133 2134 work->cm_event.private_data = &dreq_msg->private_data; 2135 2136 spin_lock_irq(&cm_id_priv->lock); 2137 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2138 goto unlock; 2139 2140 switch (cm_id_priv->id.state) { 2141 case IB_CM_REP_SENT: 2142 case IB_CM_DREQ_SENT: 2143 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2144 break; 2145 case IB_CM_ESTABLISHED: 2146 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2147 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2148 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2149 break; 2150 case IB_CM_MRA_REP_RCVD: 2151 break; 2152 case IB_CM_TIMEWAIT: 2153 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2154 counter[CM_DREQ_COUNTER]); 2155 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2156 goto unlock; 2157 2158 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2159 cm_id_priv->private_data, 2160 cm_id_priv->private_data_len); 2161 spin_unlock_irq(&cm_id_priv->lock); 2162 2163 if (ib_post_send_mad(msg, NULL)) 2164 cm_free_msg(msg); 2165 goto deref; 2166 case IB_CM_DREQ_RCVD: 2167 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2168 counter[CM_DREQ_COUNTER]); 2169 goto unlock; 2170 default: 2171 goto unlock; 2172 } 2173 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2174 cm_id_priv->tid = dreq_msg->hdr.tid; 2175 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2176 if (!ret) 2177 list_add_tail(&work->list, &cm_id_priv->work_list); 2178 spin_unlock_irq(&cm_id_priv->lock); 2179 2180 if (ret) 2181 cm_process_work(cm_id_priv, work); 2182 else 2183 cm_deref_id(cm_id_priv); 2184 return 0; 2185 2186unlock: spin_unlock_irq(&cm_id_priv->lock); 2187deref: cm_deref_id(cm_id_priv); 2188 return -EINVAL; 2189} 2190 2191static int cm_drep_handler(struct cm_work *work) 2192{ 2193 struct cm_id_private *cm_id_priv; 2194 struct cm_drep_msg *drep_msg; 2195 int ret; 2196 2197 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2198 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2199 drep_msg->local_comm_id); 2200 if (!cm_id_priv) 2201 return -EINVAL; 2202 2203 work->cm_event.private_data = &drep_msg->private_data; 2204 2205 spin_lock_irq(&cm_id_priv->lock); 2206 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2207 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2208 spin_unlock_irq(&cm_id_priv->lock); 2209 goto out; 2210 } 2211 cm_enter_timewait(cm_id_priv); 2212 2213 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2214 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2215 if (!ret) 2216 list_add_tail(&work->list, &cm_id_priv->work_list); 2217 spin_unlock_irq(&cm_id_priv->lock); 2218 2219 if (ret) 2220 cm_process_work(cm_id_priv, work); 2221 else 2222 cm_deref_id(cm_id_priv); 2223 return 0; 2224out: 2225 cm_deref_id(cm_id_priv); 2226 return -EINVAL; 2227} 2228 2229int ib_send_cm_rej(struct ib_cm_id *cm_id, 2230 enum ib_cm_rej_reason reason, 2231 void *ari, 2232 u8 ari_length, 2233 const void *private_data, 2234 u8 private_data_len) 2235{ 2236 struct cm_id_private *cm_id_priv; 2237 struct ib_mad_send_buf *msg; 2238 unsigned long flags; 2239 int ret; 2240 2241 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2242 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2243 return -EINVAL; 2244 2245 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2246 2247 spin_lock_irqsave(&cm_id_priv->lock, flags); 2248 switch (cm_id->state) { 2249 case IB_CM_REQ_SENT: 2250 case IB_CM_MRA_REQ_RCVD: 2251 case IB_CM_REQ_RCVD: 2252 case IB_CM_MRA_REQ_SENT: 2253 case IB_CM_REP_RCVD: 2254 case IB_CM_MRA_REP_SENT: 2255 ret = cm_alloc_msg(cm_id_priv, &msg); 2256 if (!ret) 2257 cm_format_rej((struct cm_rej_msg *) msg->mad, 2258 cm_id_priv, reason, ari, ari_length, 2259 private_data, private_data_len); 2260 2261 cm_reset_to_idle(cm_id_priv); 2262 break; 2263 case IB_CM_REP_SENT: 2264 case IB_CM_MRA_REP_RCVD: 2265 ret = cm_alloc_msg(cm_id_priv, &msg); 2266 if (!ret) 2267 cm_format_rej((struct cm_rej_msg *) msg->mad, 2268 cm_id_priv, reason, ari, ari_length, 2269 private_data, private_data_len); 2270 2271 cm_enter_timewait(cm_id_priv); 2272 break; 2273 default: 2274 ret = -EINVAL; 2275 goto out; 2276 } 2277 2278 if (ret) 2279 goto out; 2280 2281 ret = ib_post_send_mad(msg, NULL); 2282 if (ret) 2283 cm_free_msg(msg); 2284 2285out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2286 return ret; 2287} 2288EXPORT_SYMBOL(ib_send_cm_rej); 2289 2290static void cm_format_rej_event(struct cm_work *work) 2291{ 2292 struct cm_rej_msg *rej_msg; 2293 struct ib_cm_rej_event_param *param; 2294 2295 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2296 param = &work->cm_event.param.rej_rcvd; 2297 param->ari = rej_msg->ari; 2298 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2299 param->reason = __be16_to_cpu(rej_msg->reason); 2300 work->cm_event.private_data = &rej_msg->private_data; 2301} 2302 2303static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2304{ 2305 struct cm_timewait_info *timewait_info; 2306 struct cm_id_private *cm_id_priv; 2307 __be32 remote_id; 2308 2309 remote_id = rej_msg->local_comm_id; 2310 2311 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2312 spin_lock_irq(&cm.lock); 2313 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2314 remote_id); 2315 if (!timewait_info) { 2316 spin_unlock_irq(&cm.lock); 2317 return NULL; 2318 } 2319 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2320 (timewait_info->work.local_id ^ 2321 cm.random_id_operand)); 2322 if (cm_id_priv) { 2323 if (cm_id_priv->id.remote_id == remote_id) 2324 atomic_inc(&cm_id_priv->refcount); 2325 else 2326 cm_id_priv = NULL; 2327 } 2328 spin_unlock_irq(&cm.lock); 2329 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2330 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2331 else 2332 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2333 2334 return cm_id_priv; 2335} 2336 2337static int cm_rej_handler(struct cm_work *work) 2338{ 2339 struct cm_id_private *cm_id_priv; 2340 struct cm_rej_msg *rej_msg; 2341 int ret; 2342 2343 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2344 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2345 if (!cm_id_priv) 2346 return -EINVAL; 2347 2348 cm_format_rej_event(work); 2349 2350 spin_lock_irq(&cm_id_priv->lock); 2351 switch (cm_id_priv->id.state) { 2352 case IB_CM_REQ_SENT: 2353 case IB_CM_MRA_REQ_RCVD: 2354 case IB_CM_REP_SENT: 2355 case IB_CM_MRA_REP_RCVD: 2356 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2357 /* fall through */ 2358 case IB_CM_REQ_RCVD: 2359 case IB_CM_MRA_REQ_SENT: 2360 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2361 cm_enter_timewait(cm_id_priv); 2362 else 2363 cm_reset_to_idle(cm_id_priv); 2364 break; 2365 case IB_CM_DREQ_SENT: 2366 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2367 /* fall through */ 2368 case IB_CM_REP_RCVD: 2369 case IB_CM_MRA_REP_SENT: 2370 cm_enter_timewait(cm_id_priv); 2371 break; 2372 case IB_CM_ESTABLISHED: 2373 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2374 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2375 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2376 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2377 cm_id_priv->msg); 2378 cm_enter_timewait(cm_id_priv); 2379 break; 2380 } 2381 /* fall through */ 2382 default: 2383 spin_unlock_irq(&cm_id_priv->lock); 2384 ret = -EINVAL; 2385 goto out; 2386 } 2387 2388 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2389 if (!ret) 2390 list_add_tail(&work->list, &cm_id_priv->work_list); 2391 spin_unlock_irq(&cm_id_priv->lock); 2392 2393 if (ret) 2394 cm_process_work(cm_id_priv, work); 2395 else 2396 cm_deref_id(cm_id_priv); 2397 return 0; 2398out: 2399 cm_deref_id(cm_id_priv); 2400 return -EINVAL; 2401} 2402 2403int ib_send_cm_mra(struct ib_cm_id *cm_id, 2404 u8 service_timeout, 2405 const void *private_data, 2406 u8 private_data_len) 2407{ 2408 struct cm_id_private *cm_id_priv; 2409 struct ib_mad_send_buf *msg; 2410 enum ib_cm_state cm_state; 2411 enum ib_cm_lap_state lap_state; 2412 enum cm_msg_response msg_response; 2413 void *data; 2414 unsigned long flags; 2415 int ret; 2416 2417 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2418 return -EINVAL; 2419 2420 data = cm_copy_private_data(private_data, private_data_len); 2421 if (IS_ERR(data)) 2422 return PTR_ERR(data); 2423 2424 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2425 2426 spin_lock_irqsave(&cm_id_priv->lock, flags); 2427 switch(cm_id_priv->id.state) { 2428 case IB_CM_REQ_RCVD: 2429 cm_state = IB_CM_MRA_REQ_SENT; 2430 lap_state = cm_id->lap_state; 2431 msg_response = CM_MSG_RESPONSE_REQ; 2432 break; 2433 case IB_CM_REP_RCVD: 2434 cm_state = IB_CM_MRA_REP_SENT; 2435 lap_state = cm_id->lap_state; 2436 msg_response = CM_MSG_RESPONSE_REP; 2437 break; 2438 case IB_CM_ESTABLISHED: 2439 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2440 cm_state = cm_id->state; 2441 lap_state = IB_CM_MRA_LAP_SENT; 2442 msg_response = CM_MSG_RESPONSE_OTHER; 2443 break; 2444 } 2445 default: 2446 ret = -EINVAL; 2447 goto error1; 2448 } 2449 2450 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2451 ret = cm_alloc_msg(cm_id_priv, &msg); 2452 if (ret) 2453 goto error1; 2454 2455 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2456 msg_response, service_timeout, 2457 private_data, private_data_len); 2458 ret = ib_post_send_mad(msg, NULL); 2459 if (ret) 2460 goto error2; 2461 } 2462 2463 cm_id->state = cm_state; 2464 cm_id->lap_state = lap_state; 2465 cm_id_priv->service_timeout = service_timeout; 2466 cm_set_private_data(cm_id_priv, data, private_data_len); 2467 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2468 return 0; 2469 2470error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2471 kfree(data); 2472 return ret; 2473 2474error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2475 kfree(data); 2476 cm_free_msg(msg); 2477 return ret; 2478} 2479EXPORT_SYMBOL(ib_send_cm_mra); 2480 2481static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2482{ 2483 switch (cm_mra_get_msg_mraed(mra_msg)) { 2484 case CM_MSG_RESPONSE_REQ: 2485 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2486 case CM_MSG_RESPONSE_REP: 2487 case CM_MSG_RESPONSE_OTHER: 2488 return cm_acquire_id(mra_msg->remote_comm_id, 2489 mra_msg->local_comm_id); 2490 default: 2491 return NULL; 2492 } 2493} 2494 2495static int cm_mra_handler(struct cm_work *work) 2496{ 2497 struct cm_id_private *cm_id_priv; 2498 struct cm_mra_msg *mra_msg; 2499 int timeout, ret; 2500 2501 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2502 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2503 if (!cm_id_priv) 2504 return -EINVAL; 2505 2506 work->cm_event.private_data = &mra_msg->private_data; 2507 work->cm_event.param.mra_rcvd.service_timeout = 2508 cm_mra_get_service_timeout(mra_msg); 2509 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2510 cm_convert_to_ms(cm_id_priv->av.timeout); 2511 2512 spin_lock_irq(&cm_id_priv->lock); 2513 switch (cm_id_priv->id.state) { 2514 case IB_CM_REQ_SENT: 2515 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2516 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2517 cm_id_priv->msg, timeout)) 2518 goto out; 2519 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2520 break; 2521 case IB_CM_REP_SENT: 2522 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2523 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2524 cm_id_priv->msg, timeout)) 2525 goto out; 2526 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2527 break; 2528 case IB_CM_ESTABLISHED: 2529 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2530 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2531 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2532 cm_id_priv->msg, timeout)) { 2533 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2534 atomic_long_inc(&work->port-> 2535 counter_group[CM_RECV_DUPLICATES]. 2536 counter[CM_MRA_COUNTER]); 2537 goto out; 2538 } 2539 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2540 break; 2541 case IB_CM_MRA_REQ_RCVD: 2542 case IB_CM_MRA_REP_RCVD: 2543 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2544 counter[CM_MRA_COUNTER]); 2545 /* fall through */ 2546 default: 2547 goto out; 2548 } 2549 2550 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2551 cm_id_priv->id.state; 2552 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2553 if (!ret) 2554 list_add_tail(&work->list, &cm_id_priv->work_list); 2555 spin_unlock_irq(&cm_id_priv->lock); 2556 2557 if (ret) 2558 cm_process_work(cm_id_priv, work); 2559 else 2560 cm_deref_id(cm_id_priv); 2561 return 0; 2562out: 2563 spin_unlock_irq(&cm_id_priv->lock); 2564 cm_deref_id(cm_id_priv); 2565 return -EINVAL; 2566} 2567 2568static void cm_format_lap(struct cm_lap_msg *lap_msg, 2569 struct cm_id_private *cm_id_priv, 2570 struct ib_sa_path_rec *alternate_path, 2571 const void *private_data, 2572 u8 private_data_len) 2573{ 2574 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2575 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2576 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2577 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2578 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2579 /* todo: need remote CM response timeout */ 2580 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2581 lap_msg->alt_local_lid = alternate_path->slid; 2582 lap_msg->alt_remote_lid = alternate_path->dlid; 2583 lap_msg->alt_local_gid = alternate_path->sgid; 2584 lap_msg->alt_remote_gid = alternate_path->dgid; 2585 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2586 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2587 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2588 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2589 cm_lap_set_sl(lap_msg, alternate_path->sl); 2590 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2591 cm_lap_set_local_ack_timeout(lap_msg, 2592 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2593 alternate_path->packet_life_time)); 2594 2595 if (private_data && private_data_len) 2596 memcpy(lap_msg->private_data, private_data, private_data_len); 2597} 2598 2599int ib_send_cm_lap(struct ib_cm_id *cm_id, 2600 struct ib_sa_path_rec *alternate_path, 2601 const void *private_data, 2602 u8 private_data_len) 2603{ 2604 struct cm_id_private *cm_id_priv; 2605 struct ib_mad_send_buf *msg; 2606 unsigned long flags; 2607 int ret; 2608 2609 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2610 return -EINVAL; 2611 2612 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2613 spin_lock_irqsave(&cm_id_priv->lock, flags); 2614 if (cm_id->state != IB_CM_ESTABLISHED || 2615 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2616 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2617 ret = -EINVAL; 2618 goto out; 2619 } 2620 2621 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2622 if (ret) 2623 goto out; 2624 cm_id_priv->alt_av.timeout = 2625 cm_ack_timeout(cm_id_priv->target_ack_delay, 2626 cm_id_priv->alt_av.timeout - 1); 2627 2628 ret = cm_alloc_msg(cm_id_priv, &msg); 2629 if (ret) 2630 goto out; 2631 2632 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2633 alternate_path, private_data, private_data_len); 2634 msg->timeout_ms = cm_id_priv->timeout_ms; 2635 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2636 2637 ret = ib_post_send_mad(msg, NULL); 2638 if (ret) { 2639 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2640 cm_free_msg(msg); 2641 return ret; 2642 } 2643 2644 cm_id->lap_state = IB_CM_LAP_SENT; 2645 cm_id_priv->msg = msg; 2646 2647out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2648 return ret; 2649} 2650EXPORT_SYMBOL(ib_send_cm_lap); 2651 2652static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2653 struct ib_sa_path_rec *path, 2654 struct cm_lap_msg *lap_msg) 2655{ 2656 memset(path, 0, sizeof *path); 2657 path->dgid = lap_msg->alt_local_gid; 2658 path->sgid = lap_msg->alt_remote_gid; 2659 path->dlid = lap_msg->alt_local_lid; 2660 path->slid = lap_msg->alt_remote_lid; 2661 path->flow_label = cm_lap_get_flow_label(lap_msg); 2662 path->hop_limit = lap_msg->alt_hop_limit; 2663 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2664 path->reversible = 1; 2665 path->pkey = cm_id_priv->pkey; 2666 path->sl = cm_lap_get_sl(lap_msg); 2667 path->mtu_selector = IB_SA_EQ; 2668 path->mtu = cm_id_priv->path_mtu; 2669 path->rate_selector = IB_SA_EQ; 2670 path->rate = cm_lap_get_packet_rate(lap_msg); 2671 path->packet_life_time_selector = IB_SA_EQ; 2672 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2673 path->packet_life_time -= (path->packet_life_time > 0); 2674} 2675 2676static int cm_lap_handler(struct cm_work *work) 2677{ 2678 struct cm_id_private *cm_id_priv; 2679 struct cm_lap_msg *lap_msg; 2680 struct ib_cm_lap_event_param *param; 2681 struct ib_mad_send_buf *msg = NULL; 2682 int ret; 2683 2684 /* todo: verify LAP request and send reject APR if invalid. */ 2685 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2686 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2687 lap_msg->local_comm_id); 2688 if (!cm_id_priv) 2689 return -EINVAL; 2690 2691 param = &work->cm_event.param.lap_rcvd; 2692 param->alternate_path = &work->path[0]; 2693 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2694 work->cm_event.private_data = &lap_msg->private_data; 2695 2696 spin_lock_irq(&cm_id_priv->lock); 2697 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2698 goto unlock; 2699 2700 switch (cm_id_priv->id.lap_state) { 2701 case IB_CM_LAP_UNINIT: 2702 case IB_CM_LAP_IDLE: 2703 break; 2704 case IB_CM_MRA_LAP_SENT: 2705 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2706 counter[CM_LAP_COUNTER]); 2707 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2708 goto unlock; 2709 2710 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2711 CM_MSG_RESPONSE_OTHER, 2712 cm_id_priv->service_timeout, 2713 cm_id_priv->private_data, 2714 cm_id_priv->private_data_len); 2715 spin_unlock_irq(&cm_id_priv->lock); 2716 2717 if (ib_post_send_mad(msg, NULL)) 2718 cm_free_msg(msg); 2719 goto deref; 2720 case IB_CM_LAP_RCVD: 2721 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2722 counter[CM_LAP_COUNTER]); 2723 goto unlock; 2724 default: 2725 goto unlock; 2726 } 2727 2728 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2729 cm_id_priv->tid = lap_msg->hdr.tid; 2730 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2731 work->mad_recv_wc->recv_buf.grh, 2732 &cm_id_priv->av); 2733 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2734 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2735 if (!ret) 2736 list_add_tail(&work->list, &cm_id_priv->work_list); 2737 spin_unlock_irq(&cm_id_priv->lock); 2738 2739 if (ret) 2740 cm_process_work(cm_id_priv, work); 2741 else 2742 cm_deref_id(cm_id_priv); 2743 return 0; 2744 2745unlock: spin_unlock_irq(&cm_id_priv->lock); 2746deref: cm_deref_id(cm_id_priv); 2747 return -EINVAL; 2748} 2749 2750static void cm_format_apr(struct cm_apr_msg *apr_msg, 2751 struct cm_id_private *cm_id_priv, 2752 enum ib_cm_apr_status status, 2753 void *info, 2754 u8 info_length, 2755 const void *private_data, 2756 u8 private_data_len) 2757{ 2758 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2759 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2760 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2761 apr_msg->ap_status = (u8) status; 2762 2763 if (info && info_length) { 2764 apr_msg->info_length = info_length; 2765 memcpy(apr_msg->info, info, info_length); 2766 } 2767 2768 if (private_data && private_data_len) 2769 memcpy(apr_msg->private_data, private_data, private_data_len); 2770} 2771 2772int ib_send_cm_apr(struct ib_cm_id *cm_id, 2773 enum ib_cm_apr_status status, 2774 void *info, 2775 u8 info_length, 2776 const void *private_data, 2777 u8 private_data_len) 2778{ 2779 struct cm_id_private *cm_id_priv; 2780 struct ib_mad_send_buf *msg; 2781 unsigned long flags; 2782 int ret; 2783 2784 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2785 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2786 return -EINVAL; 2787 2788 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2789 spin_lock_irqsave(&cm_id_priv->lock, flags); 2790 if (cm_id->state != IB_CM_ESTABLISHED || 2791 (cm_id->lap_state != IB_CM_LAP_RCVD && 2792 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2793 ret = -EINVAL; 2794 goto out; 2795 } 2796 2797 ret = cm_alloc_msg(cm_id_priv, &msg); 2798 if (ret) 2799 goto out; 2800 2801 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2802 info, info_length, private_data, private_data_len); 2803 ret = ib_post_send_mad(msg, NULL); 2804 if (ret) { 2805 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2806 cm_free_msg(msg); 2807 return ret; 2808 } 2809 2810 cm_id->lap_state = IB_CM_LAP_IDLE; 2811out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2812 return ret; 2813} 2814EXPORT_SYMBOL(ib_send_cm_apr); 2815 2816static int cm_apr_handler(struct cm_work *work) 2817{ 2818 struct cm_id_private *cm_id_priv; 2819 struct cm_apr_msg *apr_msg; 2820 int ret; 2821 2822 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2823 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2824 apr_msg->local_comm_id); 2825 if (!cm_id_priv) 2826 return -EINVAL; /* Unmatched reply. */ 2827 2828 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2829 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2830 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2831 work->cm_event.private_data = &apr_msg->private_data; 2832 2833 spin_lock_irq(&cm_id_priv->lock); 2834 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2835 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2836 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2837 spin_unlock_irq(&cm_id_priv->lock); 2838 goto out; 2839 } 2840 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2841 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2842 cm_id_priv->msg = NULL; 2843 2844 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2845 if (!ret) 2846 list_add_tail(&work->list, &cm_id_priv->work_list); 2847 spin_unlock_irq(&cm_id_priv->lock); 2848 2849 if (ret) 2850 cm_process_work(cm_id_priv, work); 2851 else 2852 cm_deref_id(cm_id_priv); 2853 return 0; 2854out: 2855 cm_deref_id(cm_id_priv); 2856 return -EINVAL; 2857} 2858 2859static int cm_timewait_handler(struct cm_work *work) 2860{ 2861 struct cm_timewait_info *timewait_info; 2862 struct cm_id_private *cm_id_priv; 2863 int ret; 2864 2865 timewait_info = (struct cm_timewait_info *)work; 2866 spin_lock_irq(&cm.lock); 2867 list_del(&timewait_info->list); 2868 spin_unlock_irq(&cm.lock); 2869 2870 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2871 timewait_info->work.remote_id); 2872 if (!cm_id_priv) 2873 return -EINVAL; 2874 2875 spin_lock_irq(&cm_id_priv->lock); 2876 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2877 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2878 spin_unlock_irq(&cm_id_priv->lock); 2879 goto out; 2880 } 2881 cm_id_priv->id.state = IB_CM_IDLE; 2882 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2883 if (!ret) 2884 list_add_tail(&work->list, &cm_id_priv->work_list); 2885 spin_unlock_irq(&cm_id_priv->lock); 2886 2887 if (ret) 2888 cm_process_work(cm_id_priv, work); 2889 else 2890 cm_deref_id(cm_id_priv); 2891 return 0; 2892out: 2893 cm_deref_id(cm_id_priv); 2894 return -EINVAL; 2895} 2896 2897static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2898 struct cm_id_private *cm_id_priv, 2899 struct ib_cm_sidr_req_param *param) 2900{ 2901 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2902 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2903 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2904 sidr_req_msg->pkey = param->path->pkey; 2905 sidr_req_msg->service_id = param->service_id; 2906 2907 if (param->private_data && param->private_data_len) 2908 memcpy(sidr_req_msg->private_data, param->private_data, 2909 param->private_data_len); 2910} 2911 2912int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2913 struct ib_cm_sidr_req_param *param) 2914{ 2915 struct cm_id_private *cm_id_priv; 2916 struct ib_mad_send_buf *msg; 2917 unsigned long flags; 2918 int ret; 2919 2920 if (!param->path || (param->private_data && 2921 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2922 return -EINVAL; 2923 2924 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2925 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2926 if (ret) 2927 goto out; 2928 2929 cm_id->service_id = param->service_id; 2930 cm_id->service_mask = ~cpu_to_be64(0); 2931 cm_id_priv->timeout_ms = param->timeout_ms; 2932 cm_id_priv->max_cm_retries = param->max_cm_retries; 2933 ret = cm_alloc_msg(cm_id_priv, &msg); 2934 if (ret) 2935 goto out; 2936 2937 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2938 param); 2939 msg->timeout_ms = cm_id_priv->timeout_ms; 2940 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2941 2942 spin_lock_irqsave(&cm_id_priv->lock, flags); 2943 if (cm_id->state == IB_CM_IDLE) 2944 ret = ib_post_send_mad(msg, NULL); 2945 else 2946 ret = -EINVAL; 2947 2948 if (ret) { 2949 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2950 cm_free_msg(msg); 2951 goto out; 2952 } 2953 cm_id->state = IB_CM_SIDR_REQ_SENT; 2954 cm_id_priv->msg = msg; 2955 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2956out: 2957 return ret; 2958} 2959EXPORT_SYMBOL(ib_send_cm_sidr_req); 2960 2961static void cm_format_sidr_req_event(struct cm_work *work, 2962 struct ib_cm_id *listen_id) 2963{ 2964 struct cm_sidr_req_msg *sidr_req_msg; 2965 struct ib_cm_sidr_req_event_param *param; 2966 2967 sidr_req_msg = (struct cm_sidr_req_msg *) 2968 work->mad_recv_wc->recv_buf.mad; 2969 param = &work->cm_event.param.sidr_req_rcvd; 2970 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2971 param->listen_id = listen_id; 2972 param->port = work->port->port_num; 2973 work->cm_event.private_data = &sidr_req_msg->private_data; 2974} 2975 2976static int cm_sidr_req_handler(struct cm_work *work) 2977{ 2978 struct ib_cm_id *cm_id; 2979 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2980 struct cm_sidr_req_msg *sidr_req_msg; 2981 struct ib_wc *wc; 2982 2983 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2984 if (IS_ERR(cm_id)) 2985 return PTR_ERR(cm_id); 2986 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2987 2988 /* Record SGID/SLID and request ID for lookup. */ 2989 sidr_req_msg = (struct cm_sidr_req_msg *) 2990 work->mad_recv_wc->recv_buf.mad; 2991 wc = work->mad_recv_wc->wc; 2992 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2993 cm_id_priv->av.dgid.global.interface_id = 0; 2994 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2995 work->mad_recv_wc->recv_buf.grh, 2996 &cm_id_priv->av); 2997 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2998 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2999 atomic_inc(&cm_id_priv->work_count); 3000 3001 spin_lock_irq(&cm.lock); 3002 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3003 if (cur_cm_id_priv) { 3004 spin_unlock_irq(&cm.lock); 3005 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3006 counter[CM_SIDR_REQ_COUNTER]); 3007 goto out; /* Duplicate message. */ 3008 } 3009 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3010 cur_cm_id_priv = cm_find_listen(cm_id->device, 3011 sidr_req_msg->service_id, 3012 sidr_req_msg->private_data); 3013 if (!cur_cm_id_priv) { 3014 spin_unlock_irq(&cm.lock); 3015 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3016 goto out; /* No match. */ 3017 } 3018 atomic_inc(&cur_cm_id_priv->refcount); 3019 atomic_inc(&cm_id_priv->refcount); 3020 spin_unlock_irq(&cm.lock); 3021 3022 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3023 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3024 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3025 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3026 3027 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3028 cm_process_work(cm_id_priv, work); 3029 cm_deref_id(cur_cm_id_priv); 3030 return 0; 3031out: 3032 ib_destroy_cm_id(&cm_id_priv->id); 3033 return -EINVAL; 3034} 3035 3036static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3037 struct cm_id_private *cm_id_priv, 3038 struct ib_cm_sidr_rep_param *param) 3039{ 3040 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3041 cm_id_priv->tid); 3042 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3043 sidr_rep_msg->status = param->status; 3044 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3045 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3046 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3047 3048 if (param->info && param->info_length) 3049 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3050 3051 if (param->private_data && param->private_data_len) 3052 memcpy(sidr_rep_msg->private_data, param->private_data, 3053 param->private_data_len); 3054} 3055 3056int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3057 struct ib_cm_sidr_rep_param *param) 3058{ 3059 struct cm_id_private *cm_id_priv; 3060 struct ib_mad_send_buf *msg; 3061 unsigned long flags; 3062 int ret; 3063 3064 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3065 (param->private_data && 3066 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3067 return -EINVAL; 3068 3069 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3070 spin_lock_irqsave(&cm_id_priv->lock, flags); 3071 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3072 ret = -EINVAL; 3073 goto error; 3074 } 3075 3076 ret = cm_alloc_msg(cm_id_priv, &msg); 3077 if (ret) 3078 goto error; 3079 3080 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3081 param); 3082 ret = ib_post_send_mad(msg, NULL); 3083 if (ret) { 3084 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3085 cm_free_msg(msg); 3086 return ret; 3087 } 3088 cm_id->state = IB_CM_IDLE; 3089 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3090 3091 spin_lock_irqsave(&cm.lock, flags); 3092 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3093 spin_unlock_irqrestore(&cm.lock, flags); 3094 return 0; 3095 3096error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3097 return ret; 3098} 3099EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3100 3101static void cm_format_sidr_rep_event(struct cm_work *work) 3102{ 3103 struct cm_sidr_rep_msg *sidr_rep_msg; 3104 struct ib_cm_sidr_rep_event_param *param; 3105 3106 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3107 work->mad_recv_wc->recv_buf.mad; 3108 param = &work->cm_event.param.sidr_rep_rcvd; 3109 param->status = sidr_rep_msg->status; 3110 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3111 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3112 param->info = &sidr_rep_msg->info; 3113 param->info_len = sidr_rep_msg->info_length; 3114 work->cm_event.private_data = &sidr_rep_msg->private_data; 3115} 3116 3117static int cm_sidr_rep_handler(struct cm_work *work) 3118{ 3119 struct cm_sidr_rep_msg *sidr_rep_msg; 3120 struct cm_id_private *cm_id_priv; 3121 3122 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3123 work->mad_recv_wc->recv_buf.mad; 3124 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3125 if (!cm_id_priv) 3126 return -EINVAL; /* Unmatched reply. */ 3127 3128 spin_lock_irq(&cm_id_priv->lock); 3129 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3130 spin_unlock_irq(&cm_id_priv->lock); 3131 goto out; 3132 } 3133 cm_id_priv->id.state = IB_CM_IDLE; 3134 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3135 spin_unlock_irq(&cm_id_priv->lock); 3136 3137 cm_format_sidr_rep_event(work); 3138 cm_process_work(cm_id_priv, work); 3139 return 0; 3140out: 3141 cm_deref_id(cm_id_priv); 3142 return -EINVAL; 3143} 3144 3145static void cm_process_send_error(struct ib_mad_send_buf *msg, 3146 enum ib_wc_status wc_status) 3147{ 3148 struct cm_id_private *cm_id_priv; 3149 struct ib_cm_event cm_event; 3150 enum ib_cm_state state; 3151 int ret; 3152 3153 memset(&cm_event, 0, sizeof cm_event); 3154 cm_id_priv = msg->context[0]; 3155 3156 /* Discard old sends or ones without a response. */ 3157 spin_lock_irq(&cm_id_priv->lock); 3158 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3159 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3160 goto discard; 3161 3162 switch (state) { 3163 case IB_CM_REQ_SENT: 3164 case IB_CM_MRA_REQ_RCVD: 3165 cm_reset_to_idle(cm_id_priv); 3166 cm_event.event = IB_CM_REQ_ERROR; 3167 break; 3168 case IB_CM_REP_SENT: 3169 case IB_CM_MRA_REP_RCVD: 3170 cm_reset_to_idle(cm_id_priv); 3171 cm_event.event = IB_CM_REP_ERROR; 3172 break; 3173 case IB_CM_DREQ_SENT: 3174 cm_enter_timewait(cm_id_priv); 3175 cm_event.event = IB_CM_DREQ_ERROR; 3176 break; 3177 case IB_CM_SIDR_REQ_SENT: 3178 cm_id_priv->id.state = IB_CM_IDLE; 3179 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3180 break; 3181 default: 3182 goto discard; 3183 } 3184 spin_unlock_irq(&cm_id_priv->lock); 3185 cm_event.param.send_status = wc_status; 3186 3187 /* No other events can occur on the cm_id at this point. */ 3188 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3189 cm_free_msg(msg); 3190 if (ret) 3191 ib_destroy_cm_id(&cm_id_priv->id); 3192 return; 3193discard: 3194 spin_unlock_irq(&cm_id_priv->lock); 3195 cm_free_msg(msg); 3196} 3197 3198static void cm_send_handler(struct ib_mad_agent *mad_agent, 3199 struct ib_mad_send_wc *mad_send_wc) 3200{ 3201 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3202 struct cm_port *port; 3203 u16 attr_index; 3204 3205 port = mad_agent->context; 3206 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3207 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3208 3209 /* 3210 * If the send was in response to a received message (context[0] is not 3211 * set to a cm_id), and is not a REJ, then it is a send that was 3212 * manually retried. 3213 */ 3214 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3215 msg->retries = 1; 3216 3217 atomic_long_add(1 + msg->retries, 3218 &port->counter_group[CM_XMIT].counter[attr_index]); 3219 if (msg->retries) 3220 atomic_long_add(msg->retries, 3221 &port->counter_group[CM_XMIT_RETRIES]. 3222 counter[attr_index]); 3223 3224 switch (mad_send_wc->status) { 3225 case IB_WC_SUCCESS: 3226 case IB_WC_WR_FLUSH_ERR: 3227 cm_free_msg(msg); 3228 break; 3229 default: 3230 if (msg->context[0] && msg->context[1]) 3231 cm_process_send_error(msg, mad_send_wc->status); 3232 else 3233 cm_free_msg(msg); 3234 break; 3235 } 3236} 3237 3238static void cm_work_handler(struct work_struct *_work) 3239{ 3240 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3241 int ret; 3242 3243 switch (work->cm_event.event) { 3244 case IB_CM_REQ_RECEIVED: 3245 ret = cm_req_handler(work); 3246 break; 3247 case IB_CM_MRA_RECEIVED: 3248 ret = cm_mra_handler(work); 3249 break; 3250 case IB_CM_REJ_RECEIVED: 3251 ret = cm_rej_handler(work); 3252 break; 3253 case IB_CM_REP_RECEIVED: 3254 ret = cm_rep_handler(work); 3255 break; 3256 case IB_CM_RTU_RECEIVED: 3257 ret = cm_rtu_handler(work); 3258 break; 3259 case IB_CM_USER_ESTABLISHED: 3260 ret = cm_establish_handler(work); 3261 break; 3262 case IB_CM_DREQ_RECEIVED: 3263 ret = cm_dreq_handler(work); 3264 break; 3265 case IB_CM_DREP_RECEIVED: 3266 ret = cm_drep_handler(work); 3267 break; 3268 case IB_CM_SIDR_REQ_RECEIVED: 3269 ret = cm_sidr_req_handler(work); 3270 break; 3271 case IB_CM_SIDR_REP_RECEIVED: 3272 ret = cm_sidr_rep_handler(work); 3273 break; 3274 case IB_CM_LAP_RECEIVED: 3275 ret = cm_lap_handler(work); 3276 break; 3277 case IB_CM_APR_RECEIVED: 3278 ret = cm_apr_handler(work); 3279 break; 3280 case IB_CM_TIMEWAIT_EXIT: 3281 ret = cm_timewait_handler(work); 3282 break; 3283 default: 3284 ret = -EINVAL; 3285 break; 3286 } 3287 if (ret) 3288 cm_free_work(work); 3289} 3290 3291static int cm_establish(struct ib_cm_id *cm_id) 3292{ 3293 struct cm_id_private *cm_id_priv; 3294 struct cm_work *work; 3295 unsigned long flags; 3296 int ret = 0; 3297 3298 work = kmalloc(sizeof *work, GFP_ATOMIC); 3299 if (!work) 3300 return -ENOMEM; 3301 3302 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3303 spin_lock_irqsave(&cm_id_priv->lock, flags); 3304 switch (cm_id->state) 3305 { 3306 case IB_CM_REP_SENT: 3307 case IB_CM_MRA_REP_RCVD: 3308 cm_id->state = IB_CM_ESTABLISHED; 3309 break; 3310 case IB_CM_ESTABLISHED: 3311 ret = -EISCONN; 3312 break; 3313 default: 3314 ret = -EINVAL; 3315 break; 3316 } 3317 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3318 3319 if (ret) { 3320 kfree(work); 3321 goto out; 3322 } 3323 3324 /* 3325 * The CM worker thread may try to destroy the cm_id before it 3326 * can execute this work item. To prevent potential deadlock, 3327 * we need to find the cm_id once we're in the context of the 3328 * worker thread, rather than holding a reference on it. 3329 */ 3330 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3331 work->local_id = cm_id->local_id; 3332 work->remote_id = cm_id->remote_id; 3333 work->mad_recv_wc = NULL; 3334 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3335 queue_delayed_work(cm.wq, &work->work, 0); 3336out: 3337 return ret; 3338} 3339 3340static int cm_migrate(struct ib_cm_id *cm_id) 3341{ 3342 struct cm_id_private *cm_id_priv; 3343 unsigned long flags; 3344 int ret = 0; 3345 3346 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3347 spin_lock_irqsave(&cm_id_priv->lock, flags); 3348 if (cm_id->state == IB_CM_ESTABLISHED && 3349 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3350 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3351 cm_id->lap_state = IB_CM_LAP_IDLE; 3352 cm_id_priv->av = cm_id_priv->alt_av; 3353 } else 3354 ret = -EINVAL; 3355 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3356 3357 return ret; 3358} 3359 3360int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3361{ 3362 int ret; 3363 3364 switch (event) { 3365 case IB_EVENT_COMM_EST: 3366 ret = cm_establish(cm_id); 3367 break; 3368 case IB_EVENT_PATH_MIG: 3369 ret = cm_migrate(cm_id); 3370 break; 3371 default: 3372 ret = -EINVAL; 3373 } 3374 return ret; 3375} 3376EXPORT_SYMBOL(ib_cm_notify); 3377 3378static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3379 struct ib_mad_recv_wc *mad_recv_wc) 3380{ 3381 struct cm_port *port = mad_agent->context; 3382 struct cm_work *work; 3383 enum ib_cm_event_type event; 3384 u16 attr_id; 3385 int paths = 0; 3386 3387 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3388 case CM_REQ_ATTR_ID: 3389 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3390 alt_local_lid != 0); 3391 event = IB_CM_REQ_RECEIVED; 3392 break; 3393 case CM_MRA_ATTR_ID: 3394 event = IB_CM_MRA_RECEIVED; 3395 break; 3396 case CM_REJ_ATTR_ID: 3397 event = IB_CM_REJ_RECEIVED; 3398 break; 3399 case CM_REP_ATTR_ID: 3400 event = IB_CM_REP_RECEIVED; 3401 break; 3402 case CM_RTU_ATTR_ID: 3403 event = IB_CM_RTU_RECEIVED; 3404 break; 3405 case CM_DREQ_ATTR_ID: 3406 event = IB_CM_DREQ_RECEIVED; 3407 break; 3408 case CM_DREP_ATTR_ID: 3409 event = IB_CM_DREP_RECEIVED; 3410 break; 3411 case CM_SIDR_REQ_ATTR_ID: 3412 event = IB_CM_SIDR_REQ_RECEIVED; 3413 break; 3414 case CM_SIDR_REP_ATTR_ID: 3415 event = IB_CM_SIDR_REP_RECEIVED; 3416 break; 3417 case CM_LAP_ATTR_ID: 3418 paths = 1; 3419 event = IB_CM_LAP_RECEIVED; 3420 break; 3421 case CM_APR_ATTR_ID: 3422 event = IB_CM_APR_RECEIVED; 3423 break; 3424 default: 3425 ib_free_recv_mad(mad_recv_wc); 3426 return; 3427 } 3428 3429 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3430 atomic_long_inc(&port->counter_group[CM_RECV]. 3431 counter[attr_id - CM_ATTR_ID_OFFSET]); 3432 3433 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3434 GFP_KERNEL); 3435 if (!work) { 3436 ib_free_recv_mad(mad_recv_wc); 3437 return; 3438 } 3439 3440 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3441 work->cm_event.event = event; 3442 work->mad_recv_wc = mad_recv_wc; 3443 work->port = port; 3444 queue_delayed_work(cm.wq, &work->work, 0); 3445} 3446 3447static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3448 struct ib_qp_attr *qp_attr, 3449 int *qp_attr_mask) 3450{ 3451 unsigned long flags; 3452 int ret; 3453 3454 spin_lock_irqsave(&cm_id_priv->lock, flags); 3455 switch (cm_id_priv->id.state) { 3456 case IB_CM_REQ_SENT: 3457 case IB_CM_MRA_REQ_RCVD: 3458 case IB_CM_REQ_RCVD: 3459 case IB_CM_MRA_REQ_SENT: 3460 case IB_CM_REP_RCVD: 3461 case IB_CM_MRA_REP_SENT: 3462 case IB_CM_REP_SENT: 3463 case IB_CM_MRA_REP_RCVD: 3464 case IB_CM_ESTABLISHED: 3465 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3466 IB_QP_PKEY_INDEX | IB_QP_PORT; 3467 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3468 if (cm_id_priv->responder_resources) 3469 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3470 IB_ACCESS_REMOTE_ATOMIC; 3471 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3472 qp_attr->port_num = cm_id_priv->av.port->port_num; 3473 ret = 0; 3474 break; 3475 default: 3476 ret = -EINVAL; 3477 break; 3478 } 3479 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3480 return ret; 3481} 3482 3483static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3484 struct ib_qp_attr *qp_attr, 3485 int *qp_attr_mask) 3486{ 3487 unsigned long flags; 3488 int ret; 3489 3490 spin_lock_irqsave(&cm_id_priv->lock, flags); 3491 switch (cm_id_priv->id.state) { 3492 case IB_CM_REQ_RCVD: 3493 case IB_CM_MRA_REQ_SENT: 3494 case IB_CM_REP_RCVD: 3495 case IB_CM_MRA_REP_SENT: 3496 case IB_CM_REP_SENT: 3497 case IB_CM_MRA_REP_RCVD: 3498 case IB_CM_ESTABLISHED: 3499 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3500 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3501 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3502 qp_attr->path_mtu = cm_id_priv->path_mtu; 3503 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3504 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3505 if (cm_id_priv->qp_type == IB_QPT_RC || 3506 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3507 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3508 IB_QP_MIN_RNR_TIMER; 3509 qp_attr->max_dest_rd_atomic = 3510 cm_id_priv->responder_resources; 3511 qp_attr->min_rnr_timer = 0; 3512 } 3513 if (cm_id_priv->alt_av.ah_attr.dlid) { 3514 *qp_attr_mask |= IB_QP_ALT_PATH; 3515 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3516 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3517 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3518 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3519 } 3520 ret = 0; 3521 break; 3522 default: 3523 ret = -EINVAL; 3524 break; 3525 } 3526 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3527 return ret; 3528} 3529 3530static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3531 struct ib_qp_attr *qp_attr, 3532 int *qp_attr_mask) 3533{ 3534 unsigned long flags; 3535 int ret; 3536 3537 spin_lock_irqsave(&cm_id_priv->lock, flags); 3538 switch (cm_id_priv->id.state) { 3539 /* Allow transition to RTS before sending REP */ 3540 case IB_CM_REQ_RCVD: 3541 case IB_CM_MRA_REQ_SENT: 3542 3543 case IB_CM_REP_RCVD: 3544 case IB_CM_MRA_REP_SENT: 3545 case IB_CM_REP_SENT: 3546 case IB_CM_MRA_REP_RCVD: 3547 case IB_CM_ESTABLISHED: 3548 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3549 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3550 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3551 switch (cm_id_priv->qp_type) { 3552 case IB_QPT_RC: 3553 case IB_QPT_XRC_INI: 3554 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3555 IB_QP_MAX_QP_RD_ATOMIC; 3556 qp_attr->retry_cnt = cm_id_priv->retry_count; 3557 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3558 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3559 /* fall through */ 3560 case IB_QPT_XRC_TGT: 3561 *qp_attr_mask |= IB_QP_TIMEOUT; 3562 qp_attr->timeout = cm_id_priv->av.timeout; 3563 break; 3564 default: 3565 break; 3566 } 3567 if (cm_id_priv->alt_av.ah_attr.dlid) { 3568 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3569 qp_attr->path_mig_state = IB_MIG_REARM; 3570 } 3571 } else { 3572 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3573 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3574 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3575 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3576 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3577 qp_attr->path_mig_state = IB_MIG_REARM; 3578 } 3579 ret = 0; 3580 break; 3581 default: 3582 ret = -EINVAL; 3583 break; 3584 } 3585 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3586 return ret; 3587} 3588 3589int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3590 struct ib_qp_attr *qp_attr, 3591 int *qp_attr_mask) 3592{ 3593 struct cm_id_private *cm_id_priv; 3594 int ret; 3595 3596 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3597 switch (qp_attr->qp_state) { 3598 case IB_QPS_INIT: 3599 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3600 break; 3601 case IB_QPS_RTR: 3602 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3603 break; 3604 case IB_QPS_RTS: 3605 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3606 break; 3607 default: 3608 ret = -EINVAL; 3609 break; 3610 } 3611 return ret; 3612} 3613EXPORT_SYMBOL(ib_cm_init_qp_attr); 3614 3615static void cm_get_ack_delay(struct cm_device *cm_dev) 3616{ 3617 struct ib_device_attr attr; 3618 3619 if (ib_query_device(cm_dev->ib_device, &attr)) 3620 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3621 else 3622 cm_dev->ack_delay = attr.local_ca_ack_delay; 3623} 3624 3625static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3626 char *buf) 3627{ 3628 struct cm_counter_group *group; 3629 struct cm_counter_attribute *cm_attr; 3630 3631 group = container_of(obj, struct cm_counter_group, obj); 3632 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3633 3634 return sprintf(buf, "%ld\n", 3635 atomic_long_read(&group->counter[cm_attr->index])); 3636} 3637 3638static const struct sysfs_ops cm_counter_ops = { 3639 .show = cm_show_counter 3640}; 3641 3642static struct kobj_type cm_counter_obj_type = { 3643 .sysfs_ops = &cm_counter_ops, 3644 .default_attrs = cm_counter_default_attrs 3645}; 3646 3647static void cm_release_port_obj(struct kobject *obj) 3648{ 3649 struct cm_port *cm_port; 3650 3651 cm_port = container_of(obj, struct cm_port, port_obj); 3652 kfree(cm_port); 3653} 3654 3655static struct kobj_type cm_port_obj_type = { 3656 .release = cm_release_port_obj 3657}; 3658 3659static char *cm_devnode(struct device *dev, mode_t *mode) 3660{ 3661 if (mode) 3662 *mode = 0666; 3663 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3664} 3665 3666struct class cm_class = { 3667 .owner = THIS_MODULE, 3668 .name = "infiniband_cm", 3669 .devnode = cm_devnode, 3670}; 3671EXPORT_SYMBOL(cm_class); 3672 3673static int cm_create_port_fs(struct cm_port *port) 3674{ 3675 int i, ret; 3676 3677 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3678 &port->cm_dev->device->kobj, 3679 "%d", port->port_num); 3680 if (ret) { 3681 kfree(port); 3682 return ret; 3683 } 3684 3685 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3686 ret = kobject_init_and_add(&port->counter_group[i].obj, 3687 &cm_counter_obj_type, 3688 &port->port_obj, 3689 "%s", counter_group_names[i]); 3690 if (ret) 3691 goto error; 3692 } 3693 3694 return 0; 3695 3696error: 3697 while (i--) 3698 kobject_put(&port->counter_group[i].obj); 3699 kobject_put(&port->port_obj); 3700 return ret; 3701 3702} 3703 3704static void cm_remove_port_fs(struct cm_port *port) 3705{ 3706 int i; 3707 3708 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3709 kobject_put(&port->counter_group[i].obj); 3710 3711 kobject_put(&port->port_obj); 3712} 3713 3714static void cm_add_one(struct ib_device *ib_device) 3715{ 3716 struct cm_device *cm_dev; 3717 struct cm_port *port; 3718 struct ib_mad_reg_req reg_req = { 3719 .mgmt_class = IB_MGMT_CLASS_CM, 3720 .mgmt_class_version = IB_CM_CLASS_VERSION 3721 }; 3722 struct ib_port_modify port_modify = { 3723 .set_port_cap_mask = IB_PORT_CM_SUP 3724 }; 3725 unsigned long flags; 3726 int ret; 3727 u8 i; 3728 3729 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3730 return; 3731 3732 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3733 ib_device->phys_port_cnt, GFP_KERNEL); 3734 if (!cm_dev) 3735 return; 3736 3737 cm_dev->ib_device = ib_device; 3738 cm_get_ack_delay(cm_dev); 3739 3740 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3741 MKDEV(0, 0), NULL, 3742 "%s", ib_device->name); 3743 if (IS_ERR(cm_dev->device)) { 3744 kfree(cm_dev); 3745 return; 3746 } 3747 3748 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3749 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3750 port = kzalloc(sizeof *port, GFP_KERNEL); 3751 if (!port) 3752 goto error1; 3753 3754 cm_dev->port[i-1] = port; 3755 port->cm_dev = cm_dev; 3756 port->port_num = i; 3757 3758 ret = cm_create_port_fs(port); 3759 if (ret) 3760 goto error1; 3761 3762 port->mad_agent = ib_register_mad_agent(ib_device, i, 3763 IB_QPT_GSI, 3764 ®_req, 3765 0, 3766 cm_send_handler, 3767 cm_recv_handler, 3768 port); 3769 if (IS_ERR(port->mad_agent)) 3770 goto error2; 3771 3772 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3773 if (ret) 3774 goto error3; 3775 } 3776 ib_set_client_data(ib_device, &cm_client, cm_dev); 3777 3778 write_lock_irqsave(&cm.device_lock, flags); 3779 list_add_tail(&cm_dev->list, &cm.device_list); 3780 write_unlock_irqrestore(&cm.device_lock, flags); 3781 return; 3782 3783error3: 3784 ib_unregister_mad_agent(port->mad_agent); 3785error2: 3786 cm_remove_port_fs(port); 3787error1: 3788 port_modify.set_port_cap_mask = 0; 3789 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3790 while (--i) { 3791 port = cm_dev->port[i-1]; 3792 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3793 ib_unregister_mad_agent(port->mad_agent); 3794 cm_remove_port_fs(port); 3795 } 3796 device_unregister(cm_dev->device); 3797 kfree(cm_dev); 3798} 3799 3800static void cm_remove_one(struct ib_device *ib_device) 3801{ 3802 struct cm_device *cm_dev; 3803 struct cm_port *port; 3804 struct ib_port_modify port_modify = { 3805 .clr_port_cap_mask = IB_PORT_CM_SUP 3806 }; 3807 unsigned long flags; 3808 int i; 3809 3810 cm_dev = ib_get_client_data(ib_device, &cm_client); 3811 if (!cm_dev) 3812 return; 3813 3814 write_lock_irqsave(&cm.device_lock, flags); 3815 list_del(&cm_dev->list); 3816 write_unlock_irqrestore(&cm.device_lock, flags); 3817 3818 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3819 port = cm_dev->port[i-1]; 3820 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3821 ib_unregister_mad_agent(port->mad_agent); 3822 flush_workqueue(cm.wq); 3823 cm_remove_port_fs(port); 3824 } 3825 device_unregister(cm_dev->device); 3826 kfree(cm_dev); 3827} 3828 3829static int __init ib_cm_init(void) 3830{ 3831 int ret; 3832 3833 memset(&cm, 0, sizeof cm); 3834 INIT_LIST_HEAD(&cm.device_list); 3835 rwlock_init(&cm.device_lock); 3836 spin_lock_init(&cm.lock); 3837 cm.listen_service_table = RB_ROOT; 3838 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3839 cm.remote_id_table = RB_ROOT; 3840 cm.remote_qp_table = RB_ROOT; 3841 cm.remote_sidr_table = RB_ROOT; 3842 idr_init(&cm.local_id_table); 3843 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3844 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3845 INIT_LIST_HEAD(&cm.timewait_list); 3846 3847 ret = class_register(&cm_class); 3848 if (ret) 3849 return -ENOMEM; 3850 3851 cm.wq = create_workqueue("ib_cm"); 3852 if (!cm.wq) { 3853 ret = -ENOMEM; 3854 goto error1; 3855 } 3856 3857 ret = ib_register_client(&cm_client); 3858 if (ret) 3859 goto error2; 3860 3861 return 0; 3862error2: 3863 destroy_workqueue(cm.wq); 3864error1: 3865 class_unregister(&cm_class); 3866 return ret; 3867} 3868 3869static void __exit ib_cm_cleanup(void) 3870{ 3871 struct cm_timewait_info *timewait_info, *tmp; 3872 3873 spin_lock_irq(&cm.lock); 3874 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3875 cancel_delayed_work(&timewait_info->work.work); 3876 spin_unlock_irq(&cm.lock); 3877 3878 ib_unregister_client(&cm_client); 3879 destroy_workqueue(cm.wq); 3880 3881 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3882 list_del(&timewait_info->list); 3883 kfree(timewait_info); 3884 } 3885 3886 class_unregister(&cm_class); 3887 idr_destroy(&cm.local_id_table); 3888} 3889 3890module_init(ib_cm_init); 3891module_exit(ib_cm_cleanup); 3892 3893