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_resp_res(req_msg, param->responder_resources); 1012 cm_req_set_init_depth(req_msg, param->initiator_depth); 1013 cm_req_set_remote_resp_timeout(req_msg, 1014 param->remote_cm_response_timeout); 1015 cm_req_set_qp_type(req_msg, param->qp_type); 1016 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1018 cm_req_set_local_resp_timeout(req_msg, 1019 param->local_cm_response_timeout); 1020 cm_req_set_retry_count(req_msg, param->retry_count); 1021 req_msg->pkey = param->primary_path->pkey; 1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1023 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1025 cm_req_set_srq(req_msg, param->srq); 1026 1027 if (pri_path->hop_limit <= 1) { 1028 req_msg->primary_local_lid = pri_path->slid; 1029 req_msg->primary_remote_lid = pri_path->dlid; 1030 } else { 1031 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1032 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1033 } 1034 req_msg->primary_local_gid = pri_path->sgid; 1035 req_msg->primary_remote_gid = pri_path->dgid; 1036 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1037 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1038 req_msg->primary_traffic_class = pri_path->traffic_class; 1039 req_msg->primary_hop_limit = pri_path->hop_limit; 1040 cm_req_set_primary_sl(req_msg, pri_path->sl); 1041 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1042 cm_req_set_primary_local_ack_timeout(req_msg, 1043 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1044 pri_path->packet_life_time)); 1045 1046 if (alt_path) { 1047 if (alt_path->hop_limit <= 1) { 1048 req_msg->alt_local_lid = alt_path->slid; 1049 req_msg->alt_remote_lid = alt_path->dlid; 1050 } else { 1051 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1052 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1053 } 1054 req_msg->alt_local_gid = alt_path->sgid; 1055 req_msg->alt_remote_gid = alt_path->dgid; 1056 cm_req_set_alt_flow_label(req_msg, 1057 alt_path->flow_label); 1058 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1059 req_msg->alt_traffic_class = alt_path->traffic_class; 1060 req_msg->alt_hop_limit = alt_path->hop_limit; 1061 cm_req_set_alt_sl(req_msg, alt_path->sl); 1062 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1063 cm_req_set_alt_local_ack_timeout(req_msg, 1064 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1065 alt_path->packet_life_time)); 1066 } 1067 1068 if (param->private_data && param->private_data_len) 1069 memcpy(req_msg->private_data, param->private_data, 1070 param->private_data_len); 1071} 1072 1073static int cm_validate_req_param(struct ib_cm_req_param *param) 1074{ 1075 /* peer-to-peer not supported */ 1076 if (param->peer_to_peer) 1077 return -EINVAL; 1078 1079 if (!param->primary_path) 1080 return -EINVAL; 1081 1082 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1083 return -EINVAL; 1084 1085 if (param->private_data && 1086 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1087 return -EINVAL; 1088 1089 if (param->alternate_path && 1090 (param->alternate_path->pkey != param->primary_path->pkey || 1091 param->alternate_path->mtu != param->primary_path->mtu)) 1092 return -EINVAL; 1093 1094 return 0; 1095} 1096 1097int ib_send_cm_req(struct ib_cm_id *cm_id, 1098 struct ib_cm_req_param *param) 1099{ 1100 struct cm_id_private *cm_id_priv; 1101 struct cm_req_msg *req_msg; 1102 unsigned long flags; 1103 int ret; 1104 1105 ret = cm_validate_req_param(param); 1106 if (ret) 1107 return ret; 1108 1109 /* Verify that we're not in timewait. */ 1110 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1111 spin_lock_irqsave(&cm_id_priv->lock, flags); 1112 if (cm_id->state != IB_CM_IDLE) { 1113 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1114 ret = -EINVAL; 1115 goto out; 1116 } 1117 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1118 1119 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1120 id.local_id); 1121 if (IS_ERR(cm_id_priv->timewait_info)) { 1122 ret = PTR_ERR(cm_id_priv->timewait_info); 1123 goto out; 1124 } 1125 1126 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1127 if (ret) 1128 goto error1; 1129 if (param->alternate_path) { 1130 ret = cm_init_av_by_path(param->alternate_path, 1131 &cm_id_priv->alt_av); 1132 if (ret) 1133 goto error1; 1134 } 1135 cm_id->service_id = param->service_id; 1136 cm_id->service_mask = ~cpu_to_be64(0); 1137 cm_id_priv->timeout_ms = cm_convert_to_ms( 1138 param->primary_path->packet_life_time) * 2 + 1139 cm_convert_to_ms( 1140 param->remote_cm_response_timeout); 1141 cm_id_priv->max_cm_retries = param->max_cm_retries; 1142 cm_id_priv->initiator_depth = param->initiator_depth; 1143 cm_id_priv->responder_resources = param->responder_resources; 1144 cm_id_priv->retry_count = param->retry_count; 1145 cm_id_priv->path_mtu = param->primary_path->mtu; 1146 cm_id_priv->pkey = param->primary_path->pkey; 1147 cm_id_priv->qp_type = param->qp_type; 1148 1149 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1150 if (ret) 1151 goto error1; 1152 1153 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1154 cm_format_req(req_msg, cm_id_priv, param); 1155 cm_id_priv->tid = req_msg->hdr.tid; 1156 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1157 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1158 1159 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1160 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1161 1162 spin_lock_irqsave(&cm_id_priv->lock, flags); 1163 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1164 if (ret) { 1165 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1166 goto error2; 1167 } 1168 BUG_ON(cm_id->state != IB_CM_IDLE); 1169 cm_id->state = IB_CM_REQ_SENT; 1170 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1171 return 0; 1172 1173error2: cm_free_msg(cm_id_priv->msg); 1174error1: kfree(cm_id_priv->timewait_info); 1175out: return ret; 1176} 1177EXPORT_SYMBOL(ib_send_cm_req); 1178 1179static int cm_issue_rej(struct cm_port *port, 1180 struct ib_mad_recv_wc *mad_recv_wc, 1181 enum ib_cm_rej_reason reason, 1182 enum cm_msg_response msg_rejected, 1183 void *ari, u8 ari_length) 1184{ 1185 struct ib_mad_send_buf *msg = NULL; 1186 struct cm_rej_msg *rej_msg, *rcv_msg; 1187 int ret; 1188 1189 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1190 if (ret) 1191 return ret; 1192 1193 /* We just need common CM header information. Cast to any message. */ 1194 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1195 rej_msg = (struct cm_rej_msg *) msg->mad; 1196 1197 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1198 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1199 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1200 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1201 rej_msg->reason = cpu_to_be16(reason); 1202 1203 if (ari && ari_length) { 1204 cm_rej_set_reject_info_len(rej_msg, ari_length); 1205 memcpy(rej_msg->ari, ari, ari_length); 1206 } 1207 1208 ret = ib_post_send_mad(msg, NULL); 1209 if (ret) 1210 cm_free_msg(msg); 1211 1212 return ret; 1213} 1214 1215static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1216 __be32 local_qpn, __be32 remote_qpn) 1217{ 1218 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1219 ((local_ca_guid == remote_ca_guid) && 1220 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1221} 1222 1223static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1224 struct ib_sa_path_rec *primary_path, 1225 struct ib_sa_path_rec *alt_path) 1226{ 1227 memset(primary_path, 0, sizeof *primary_path); 1228 primary_path->dgid = req_msg->primary_local_gid; 1229 primary_path->sgid = req_msg->primary_remote_gid; 1230 primary_path->dlid = req_msg->primary_local_lid; 1231 primary_path->slid = req_msg->primary_remote_lid; 1232 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1233 primary_path->hop_limit = req_msg->primary_hop_limit; 1234 primary_path->traffic_class = req_msg->primary_traffic_class; 1235 primary_path->reversible = 1; 1236 primary_path->pkey = req_msg->pkey; 1237 primary_path->sl = cm_req_get_primary_sl(req_msg); 1238 primary_path->mtu_selector = IB_SA_EQ; 1239 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1240 primary_path->rate_selector = IB_SA_EQ; 1241 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1242 primary_path->packet_life_time_selector = IB_SA_EQ; 1243 primary_path->packet_life_time = 1244 cm_req_get_primary_local_ack_timeout(req_msg); 1245 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1246 1247 if (req_msg->alt_local_lid) { 1248 memset(alt_path, 0, sizeof *alt_path); 1249 alt_path->dgid = req_msg->alt_local_gid; 1250 alt_path->sgid = req_msg->alt_remote_gid; 1251 alt_path->dlid = req_msg->alt_local_lid; 1252 alt_path->slid = req_msg->alt_remote_lid; 1253 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1254 alt_path->hop_limit = req_msg->alt_hop_limit; 1255 alt_path->traffic_class = req_msg->alt_traffic_class; 1256 alt_path->reversible = 1; 1257 alt_path->pkey = req_msg->pkey; 1258 alt_path->sl = cm_req_get_alt_sl(req_msg); 1259 alt_path->mtu_selector = IB_SA_EQ; 1260 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1261 alt_path->rate_selector = IB_SA_EQ; 1262 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1263 alt_path->packet_life_time_selector = IB_SA_EQ; 1264 alt_path->packet_life_time = 1265 cm_req_get_alt_local_ack_timeout(req_msg); 1266 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1267 } 1268} 1269 1270static void cm_format_req_event(struct cm_work *work, 1271 struct cm_id_private *cm_id_priv, 1272 struct ib_cm_id *listen_id) 1273{ 1274 struct cm_req_msg *req_msg; 1275 struct ib_cm_req_event_param *param; 1276 1277 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1278 param = &work->cm_event.param.req_rcvd; 1279 param->listen_id = listen_id; 1280 param->port = cm_id_priv->av.port->port_num; 1281 param->primary_path = &work->path[0]; 1282 if (req_msg->alt_local_lid) 1283 param->alternate_path = &work->path[1]; 1284 else 1285 param->alternate_path = NULL; 1286 param->remote_ca_guid = req_msg->local_ca_guid; 1287 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1288 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1289 param->qp_type = cm_req_get_qp_type(req_msg); 1290 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1291 param->responder_resources = cm_req_get_init_depth(req_msg); 1292 param->initiator_depth = cm_req_get_resp_res(req_msg); 1293 param->local_cm_response_timeout = 1294 cm_req_get_remote_resp_timeout(req_msg); 1295 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1296 param->remote_cm_response_timeout = 1297 cm_req_get_local_resp_timeout(req_msg); 1298 param->retry_count = cm_req_get_retry_count(req_msg); 1299 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1300 param->srq = cm_req_get_srq(req_msg); 1301 work->cm_event.private_data = &req_msg->private_data; 1302} 1303 1304static void cm_process_work(struct cm_id_private *cm_id_priv, 1305 struct cm_work *work) 1306{ 1307 int ret; 1308 1309 /* We will typically only have the current event to report. */ 1310 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1311 cm_free_work(work); 1312 1313 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1314 spin_lock_irq(&cm_id_priv->lock); 1315 work = cm_dequeue_work(cm_id_priv); 1316 spin_unlock_irq(&cm_id_priv->lock); 1317 BUG_ON(!work); 1318 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1319 &work->cm_event); 1320 cm_free_work(work); 1321 } 1322 cm_deref_id(cm_id_priv); 1323 if (ret) 1324 cm_destroy_id(&cm_id_priv->id, ret); 1325} 1326 1327static void cm_format_mra(struct cm_mra_msg *mra_msg, 1328 struct cm_id_private *cm_id_priv, 1329 enum cm_msg_response msg_mraed, u8 service_timeout, 1330 const void *private_data, u8 private_data_len) 1331{ 1332 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1333 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1334 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1335 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1336 cm_mra_set_service_timeout(mra_msg, service_timeout); 1337 1338 if (private_data && private_data_len) 1339 memcpy(mra_msg->private_data, private_data, private_data_len); 1340} 1341 1342static void cm_format_rej(struct cm_rej_msg *rej_msg, 1343 struct cm_id_private *cm_id_priv, 1344 enum ib_cm_rej_reason reason, 1345 void *ari, 1346 u8 ari_length, 1347 const void *private_data, 1348 u8 private_data_len) 1349{ 1350 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1351 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1352 1353 switch(cm_id_priv->id.state) { 1354 case IB_CM_REQ_RCVD: 1355 rej_msg->local_comm_id = 0; 1356 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1357 break; 1358 case IB_CM_MRA_REQ_SENT: 1359 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1360 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1361 break; 1362 case IB_CM_REP_RCVD: 1363 case IB_CM_MRA_REP_SENT: 1364 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1365 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1366 break; 1367 default: 1368 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1369 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1370 break; 1371 } 1372 1373 rej_msg->reason = cpu_to_be16(reason); 1374 if (ari && ari_length) { 1375 cm_rej_set_reject_info_len(rej_msg, ari_length); 1376 memcpy(rej_msg->ari, ari, ari_length); 1377 } 1378 1379 if (private_data && private_data_len) 1380 memcpy(rej_msg->private_data, private_data, private_data_len); 1381} 1382 1383static void cm_dup_req_handler(struct cm_work *work, 1384 struct cm_id_private *cm_id_priv) 1385{ 1386 struct ib_mad_send_buf *msg = NULL; 1387 int ret; 1388 1389 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1390 counter[CM_REQ_COUNTER]); 1391 1392 /* Quick state check to discard duplicate REQs. */ 1393 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1394 return; 1395 1396 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1397 if (ret) 1398 return; 1399 1400 spin_lock_irq(&cm_id_priv->lock); 1401 switch (cm_id_priv->id.state) { 1402 case IB_CM_MRA_REQ_SENT: 1403 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1404 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1405 cm_id_priv->private_data, 1406 cm_id_priv->private_data_len); 1407 break; 1408 case IB_CM_TIMEWAIT: 1409 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1410 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1411 break; 1412 default: 1413 goto unlock; 1414 } 1415 spin_unlock_irq(&cm_id_priv->lock); 1416 1417 ret = ib_post_send_mad(msg, NULL); 1418 if (ret) 1419 goto free; 1420 return; 1421 1422unlock: spin_unlock_irq(&cm_id_priv->lock); 1423free: cm_free_msg(msg); 1424} 1425 1426static struct cm_id_private * cm_match_req(struct cm_work *work, 1427 struct cm_id_private *cm_id_priv) 1428{ 1429 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1430 struct cm_timewait_info *timewait_info; 1431 struct cm_req_msg *req_msg; 1432 1433 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1434 1435 /* Check for possible duplicate REQ. */ 1436 spin_lock_irq(&cm.lock); 1437 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1438 if (timewait_info) { 1439 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1440 timewait_info->work.remote_id); 1441 spin_unlock_irq(&cm.lock); 1442 if (cur_cm_id_priv) { 1443 cm_dup_req_handler(work, cur_cm_id_priv); 1444 cm_deref_id(cur_cm_id_priv); 1445 } 1446 return NULL; 1447 } 1448 1449 /* Check for stale connections. */ 1450 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1451 if (timewait_info) { 1452 cm_cleanup_timewait(cm_id_priv->timewait_info); 1453 spin_unlock_irq(&cm.lock); 1454 cm_issue_rej(work->port, work->mad_recv_wc, 1455 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1456 NULL, 0); 1457 return NULL; 1458 } 1459 1460 /* Find matching listen request. */ 1461 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1462 req_msg->service_id, 1463 req_msg->private_data); 1464 if (!listen_cm_id_priv) { 1465 cm_cleanup_timewait(cm_id_priv->timewait_info); 1466 spin_unlock_irq(&cm.lock); 1467 cm_issue_rej(work->port, work->mad_recv_wc, 1468 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1469 NULL, 0); 1470 goto out; 1471 } 1472 atomic_inc(&listen_cm_id_priv->refcount); 1473 atomic_inc(&cm_id_priv->refcount); 1474 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1475 atomic_inc(&cm_id_priv->work_count); 1476 spin_unlock_irq(&cm.lock); 1477out: 1478 return listen_cm_id_priv; 1479} 1480 1481static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1482{ 1483 if (!cm_req_get_primary_subnet_local(req_msg)) { 1484 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1485 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1486 cm_req_set_primary_sl(req_msg, wc->sl); 1487 } 1488 1489 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1490 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1491 } 1492 1493 if (!cm_req_get_alt_subnet_local(req_msg)) { 1494 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1495 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1496 cm_req_set_alt_sl(req_msg, wc->sl); 1497 } 1498 1499 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1500 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1501 } 1502} 1503 1504static int cm_req_handler(struct cm_work *work) 1505{ 1506 struct ib_cm_id *cm_id; 1507 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1508 struct cm_req_msg *req_msg; 1509 int ret; 1510 1511 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1512 1513 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1514 if (IS_ERR(cm_id)) 1515 return PTR_ERR(cm_id); 1516 1517 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1518 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1519 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1520 work->mad_recv_wc->recv_buf.grh, 1521 &cm_id_priv->av); 1522 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1523 id.local_id); 1524 if (IS_ERR(cm_id_priv->timewait_info)) { 1525 ret = PTR_ERR(cm_id_priv->timewait_info); 1526 goto destroy; 1527 } 1528 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1529 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1530 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1531 1532 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1533 if (!listen_cm_id_priv) { 1534 ret = -EINVAL; 1535 kfree(cm_id_priv->timewait_info); 1536 goto destroy; 1537 } 1538 1539 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1540 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1541 cm_id_priv->id.service_id = req_msg->service_id; 1542 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1543 1544 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1545 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1546 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1547 if (ret) { 1548 ib_get_cached_gid(work->port->cm_dev->ib_device, 1549 work->port->port_num, 0, &work->path[0].sgid); 1550 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1551 &work->path[0].sgid, sizeof work->path[0].sgid, 1552 NULL, 0); 1553 goto rejected; 1554 } 1555 if (req_msg->alt_local_lid) { 1556 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1557 if (ret) { 1558 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1559 &work->path[0].sgid, 1560 sizeof work->path[0].sgid, NULL, 0); 1561 goto rejected; 1562 } 1563 } 1564 cm_id_priv->tid = req_msg->hdr.tid; 1565 cm_id_priv->timeout_ms = cm_convert_to_ms( 1566 cm_req_get_local_resp_timeout(req_msg)); 1567 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1568 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1569 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1570 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1571 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1572 cm_id_priv->pkey = req_msg->pkey; 1573 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1574 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1575 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1576 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1577 1578 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1579 cm_process_work(cm_id_priv, work); 1580 cm_deref_id(listen_cm_id_priv); 1581 return 0; 1582 1583rejected: 1584 atomic_dec(&cm_id_priv->refcount); 1585 cm_deref_id(listen_cm_id_priv); 1586destroy: 1587 ib_destroy_cm_id(cm_id); 1588 return ret; 1589} 1590 1591static void cm_format_rep(struct cm_rep_msg *rep_msg, 1592 struct cm_id_private *cm_id_priv, 1593 struct ib_cm_rep_param *param) 1594{ 1595 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1596 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1597 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1598 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1599 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1600 rep_msg->resp_resources = param->responder_resources; 1601 rep_msg->initiator_depth = param->initiator_depth; 1602 cm_rep_set_target_ack_delay(rep_msg, 1603 cm_id_priv->av.port->cm_dev->ack_delay); 1604 cm_rep_set_failover(rep_msg, param->failover_accepted); 1605 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1606 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1607 cm_rep_set_srq(rep_msg, param->srq); 1608 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1609 1610 if (param->private_data && param->private_data_len) 1611 memcpy(rep_msg->private_data, param->private_data, 1612 param->private_data_len); 1613} 1614 1615int ib_send_cm_rep(struct ib_cm_id *cm_id, 1616 struct ib_cm_rep_param *param) 1617{ 1618 struct cm_id_private *cm_id_priv; 1619 struct ib_mad_send_buf *msg; 1620 struct cm_rep_msg *rep_msg; 1621 unsigned long flags; 1622 int ret; 1623 1624 if (param->private_data && 1625 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1626 return -EINVAL; 1627 1628 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1629 spin_lock_irqsave(&cm_id_priv->lock, flags); 1630 if (cm_id->state != IB_CM_REQ_RCVD && 1631 cm_id->state != IB_CM_MRA_REQ_SENT) { 1632 ret = -EINVAL; 1633 goto out; 1634 } 1635 1636 ret = cm_alloc_msg(cm_id_priv, &msg); 1637 if (ret) 1638 goto out; 1639 1640 rep_msg = (struct cm_rep_msg *) msg->mad; 1641 cm_format_rep(rep_msg, cm_id_priv, param); 1642 msg->timeout_ms = cm_id_priv->timeout_ms; 1643 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1644 1645 ret = ib_post_send_mad(msg, NULL); 1646 if (ret) { 1647 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1648 cm_free_msg(msg); 1649 return ret; 1650 } 1651 1652 cm_id->state = IB_CM_REP_SENT; 1653 cm_id_priv->msg = msg; 1654 cm_id_priv->initiator_depth = param->initiator_depth; 1655 cm_id_priv->responder_resources = param->responder_resources; 1656 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1657 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1658 1659out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1660 return ret; 1661} 1662EXPORT_SYMBOL(ib_send_cm_rep); 1663 1664static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1665 struct cm_id_private *cm_id_priv, 1666 const void *private_data, 1667 u8 private_data_len) 1668{ 1669 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1670 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1671 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1672 1673 if (private_data && private_data_len) 1674 memcpy(rtu_msg->private_data, private_data, private_data_len); 1675} 1676 1677int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1678 const void *private_data, 1679 u8 private_data_len) 1680{ 1681 struct cm_id_private *cm_id_priv; 1682 struct ib_mad_send_buf *msg; 1683 unsigned long flags; 1684 void *data; 1685 int ret; 1686 1687 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1688 return -EINVAL; 1689 1690 data = cm_copy_private_data(private_data, private_data_len); 1691 if (IS_ERR(data)) 1692 return PTR_ERR(data); 1693 1694 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1695 spin_lock_irqsave(&cm_id_priv->lock, flags); 1696 if (cm_id->state != IB_CM_REP_RCVD && 1697 cm_id->state != IB_CM_MRA_REP_SENT) { 1698 ret = -EINVAL; 1699 goto error; 1700 } 1701 1702 ret = cm_alloc_msg(cm_id_priv, &msg); 1703 if (ret) 1704 goto error; 1705 1706 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1707 private_data, private_data_len); 1708 1709 ret = ib_post_send_mad(msg, NULL); 1710 if (ret) { 1711 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1712 cm_free_msg(msg); 1713 kfree(data); 1714 return ret; 1715 } 1716 1717 cm_id->state = IB_CM_ESTABLISHED; 1718 cm_set_private_data(cm_id_priv, data, private_data_len); 1719 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1720 return 0; 1721 1722error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1723 kfree(data); 1724 return ret; 1725} 1726EXPORT_SYMBOL(ib_send_cm_rtu); 1727 1728static void cm_format_rep_event(struct cm_work *work) 1729{ 1730 struct cm_rep_msg *rep_msg; 1731 struct ib_cm_rep_event_param *param; 1732 1733 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1734 param = &work->cm_event.param.rep_rcvd; 1735 param->remote_ca_guid = rep_msg->local_ca_guid; 1736 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1737 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1738 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1739 param->responder_resources = rep_msg->initiator_depth; 1740 param->initiator_depth = rep_msg->resp_resources; 1741 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1742 param->failover_accepted = cm_rep_get_failover(rep_msg); 1743 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1744 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1745 param->srq = cm_rep_get_srq(rep_msg); 1746 work->cm_event.private_data = &rep_msg->private_data; 1747} 1748 1749static void cm_dup_rep_handler(struct cm_work *work) 1750{ 1751 struct cm_id_private *cm_id_priv; 1752 struct cm_rep_msg *rep_msg; 1753 struct ib_mad_send_buf *msg = NULL; 1754 int ret; 1755 1756 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1757 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1758 rep_msg->local_comm_id); 1759 if (!cm_id_priv) 1760 return; 1761 1762 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1763 counter[CM_REP_COUNTER]); 1764 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1765 if (ret) 1766 goto deref; 1767 1768 spin_lock_irq(&cm_id_priv->lock); 1769 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1770 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1771 cm_id_priv->private_data, 1772 cm_id_priv->private_data_len); 1773 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1774 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1775 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1776 cm_id_priv->private_data, 1777 cm_id_priv->private_data_len); 1778 else 1779 goto unlock; 1780 spin_unlock_irq(&cm_id_priv->lock); 1781 1782 ret = ib_post_send_mad(msg, NULL); 1783 if (ret) 1784 goto free; 1785 goto deref; 1786 1787unlock: spin_unlock_irq(&cm_id_priv->lock); 1788free: cm_free_msg(msg); 1789deref: cm_deref_id(cm_id_priv); 1790} 1791 1792static int cm_rep_handler(struct cm_work *work) 1793{ 1794 struct cm_id_private *cm_id_priv; 1795 struct cm_rep_msg *rep_msg; 1796 int ret; 1797 1798 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1799 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1800 if (!cm_id_priv) { 1801 cm_dup_rep_handler(work); 1802 return -EINVAL; 1803 } 1804 1805 cm_format_rep_event(work); 1806 1807 spin_lock_irq(&cm_id_priv->lock); 1808 switch (cm_id_priv->id.state) { 1809 case IB_CM_REQ_SENT: 1810 case IB_CM_MRA_REQ_RCVD: 1811 break; 1812 default: 1813 spin_unlock_irq(&cm_id_priv->lock); 1814 ret = -EINVAL; 1815 goto error; 1816 } 1817 1818 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1819 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1820 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1821 1822 spin_lock(&cm.lock); 1823 /* Check for duplicate REP. */ 1824 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1825 spin_unlock(&cm.lock); 1826 spin_unlock_irq(&cm_id_priv->lock); 1827 ret = -EINVAL; 1828 goto error; 1829 } 1830 /* Check for a stale connection. */ 1831 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1832 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1833 &cm.remote_id_table); 1834 cm_id_priv->timewait_info->inserted_remote_id = 0; 1835 spin_unlock(&cm.lock); 1836 spin_unlock_irq(&cm_id_priv->lock); 1837 cm_issue_rej(work->port, work->mad_recv_wc, 1838 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1839 NULL, 0); 1840 ret = -EINVAL; 1841 goto error; 1842 } 1843 spin_unlock(&cm.lock); 1844 1845 cm_id_priv->id.state = IB_CM_REP_RCVD; 1846 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1847 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1848 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1849 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1850 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1851 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1852 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1853 cm_id_priv->av.timeout = 1854 cm_ack_timeout(cm_id_priv->target_ack_delay, 1855 cm_id_priv->av.timeout - 1); 1856 cm_id_priv->alt_av.timeout = 1857 cm_ack_timeout(cm_id_priv->target_ack_delay, 1858 cm_id_priv->alt_av.timeout - 1); 1859 1860 /* todo: handle peer_to_peer */ 1861 1862 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1863 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1864 if (!ret) 1865 list_add_tail(&work->list, &cm_id_priv->work_list); 1866 spin_unlock_irq(&cm_id_priv->lock); 1867 1868 if (ret) 1869 cm_process_work(cm_id_priv, work); 1870 else 1871 cm_deref_id(cm_id_priv); 1872 return 0; 1873 1874error: 1875 cm_deref_id(cm_id_priv); 1876 return ret; 1877} 1878 1879static int cm_establish_handler(struct cm_work *work) 1880{ 1881 struct cm_id_private *cm_id_priv; 1882 int ret; 1883 1884 /* See comment in cm_establish about lookup. */ 1885 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1886 if (!cm_id_priv) 1887 return -EINVAL; 1888 1889 spin_lock_irq(&cm_id_priv->lock); 1890 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1891 spin_unlock_irq(&cm_id_priv->lock); 1892 goto out; 1893 } 1894 1895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1896 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1897 if (!ret) 1898 list_add_tail(&work->list, &cm_id_priv->work_list); 1899 spin_unlock_irq(&cm_id_priv->lock); 1900 1901 if (ret) 1902 cm_process_work(cm_id_priv, work); 1903 else 1904 cm_deref_id(cm_id_priv); 1905 return 0; 1906out: 1907 cm_deref_id(cm_id_priv); 1908 return -EINVAL; 1909} 1910 1911static int cm_rtu_handler(struct cm_work *work) 1912{ 1913 struct cm_id_private *cm_id_priv; 1914 struct cm_rtu_msg *rtu_msg; 1915 int ret; 1916 1917 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1918 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1919 rtu_msg->local_comm_id); 1920 if (!cm_id_priv) 1921 return -EINVAL; 1922 1923 work->cm_event.private_data = &rtu_msg->private_data; 1924 1925 spin_lock_irq(&cm_id_priv->lock); 1926 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1927 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1928 spin_unlock_irq(&cm_id_priv->lock); 1929 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1930 counter[CM_RTU_COUNTER]); 1931 goto out; 1932 } 1933 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1934 1935 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1936 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1937 if (!ret) 1938 list_add_tail(&work->list, &cm_id_priv->work_list); 1939 spin_unlock_irq(&cm_id_priv->lock); 1940 1941 if (ret) 1942 cm_process_work(cm_id_priv, work); 1943 else 1944 cm_deref_id(cm_id_priv); 1945 return 0; 1946out: 1947 cm_deref_id(cm_id_priv); 1948 return -EINVAL; 1949} 1950 1951static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1952 struct cm_id_private *cm_id_priv, 1953 const void *private_data, 1954 u8 private_data_len) 1955{ 1956 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1957 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1958 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1959 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1960 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1961 1962 if (private_data && private_data_len) 1963 memcpy(dreq_msg->private_data, private_data, private_data_len); 1964} 1965 1966int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1967 const void *private_data, 1968 u8 private_data_len) 1969{ 1970 struct cm_id_private *cm_id_priv; 1971 struct ib_mad_send_buf *msg; 1972 unsigned long flags; 1973 int ret; 1974 1975 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1976 return -EINVAL; 1977 1978 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1979 spin_lock_irqsave(&cm_id_priv->lock, flags); 1980 if (cm_id->state != IB_CM_ESTABLISHED) { 1981 ret = -EINVAL; 1982 goto out; 1983 } 1984 1985 ret = cm_alloc_msg(cm_id_priv, &msg); 1986 if (ret) { 1987 cm_enter_timewait(cm_id_priv); 1988 goto out; 1989 } 1990 1991 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1992 private_data, private_data_len); 1993 msg->timeout_ms = cm_id_priv->timeout_ms; 1994 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1995 1996 ret = ib_post_send_mad(msg, NULL); 1997 if (ret) { 1998 cm_enter_timewait(cm_id_priv); 1999 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2000 cm_free_msg(msg); 2001 return ret; 2002 } 2003 2004 cm_id->state = IB_CM_DREQ_SENT; 2005 cm_id_priv->msg = msg; 2006out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2007 return ret; 2008} 2009EXPORT_SYMBOL(ib_send_cm_dreq); 2010 2011static void cm_format_drep(struct cm_drep_msg *drep_msg, 2012 struct cm_id_private *cm_id_priv, 2013 const void *private_data, 2014 u8 private_data_len) 2015{ 2016 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2017 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2018 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2019 2020 if (private_data && private_data_len) 2021 memcpy(drep_msg->private_data, private_data, private_data_len); 2022} 2023 2024int ib_send_cm_drep(struct ib_cm_id *cm_id, 2025 const void *private_data, 2026 u8 private_data_len) 2027{ 2028 struct cm_id_private *cm_id_priv; 2029 struct ib_mad_send_buf *msg; 2030 unsigned long flags; 2031 void *data; 2032 int ret; 2033 2034 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2035 return -EINVAL; 2036 2037 data = cm_copy_private_data(private_data, private_data_len); 2038 if (IS_ERR(data)) 2039 return PTR_ERR(data); 2040 2041 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2042 spin_lock_irqsave(&cm_id_priv->lock, flags); 2043 if (cm_id->state != IB_CM_DREQ_RCVD) { 2044 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2045 kfree(data); 2046 return -EINVAL; 2047 } 2048 2049 cm_set_private_data(cm_id_priv, data, private_data_len); 2050 cm_enter_timewait(cm_id_priv); 2051 2052 ret = cm_alloc_msg(cm_id_priv, &msg); 2053 if (ret) 2054 goto out; 2055 2056 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2057 private_data, private_data_len); 2058 2059 ret = ib_post_send_mad(msg, NULL); 2060 if (ret) { 2061 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2062 cm_free_msg(msg); 2063 return ret; 2064 } 2065 2066out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2067 return ret; 2068} 2069EXPORT_SYMBOL(ib_send_cm_drep); 2070 2071static int cm_issue_drep(struct cm_port *port, 2072 struct ib_mad_recv_wc *mad_recv_wc) 2073{ 2074 struct ib_mad_send_buf *msg = NULL; 2075 struct cm_dreq_msg *dreq_msg; 2076 struct cm_drep_msg *drep_msg; 2077 int ret; 2078 2079 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2080 if (ret) 2081 return ret; 2082 2083 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2084 drep_msg = (struct cm_drep_msg *) msg->mad; 2085 2086 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2087 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2088 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2089 2090 ret = ib_post_send_mad(msg, NULL); 2091 if (ret) 2092 cm_free_msg(msg); 2093 2094 return ret; 2095} 2096 2097static int cm_dreq_handler(struct cm_work *work) 2098{ 2099 struct cm_id_private *cm_id_priv; 2100 struct cm_dreq_msg *dreq_msg; 2101 struct ib_mad_send_buf *msg = NULL; 2102 int ret; 2103 2104 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2105 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2106 dreq_msg->local_comm_id); 2107 if (!cm_id_priv) { 2108 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2109 counter[CM_DREQ_COUNTER]); 2110 cm_issue_drep(work->port, work->mad_recv_wc); 2111 return -EINVAL; 2112 } 2113 2114 work->cm_event.private_data = &dreq_msg->private_data; 2115 2116 spin_lock_irq(&cm_id_priv->lock); 2117 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2118 goto unlock; 2119 2120 switch (cm_id_priv->id.state) { 2121 case IB_CM_REP_SENT: 2122 case IB_CM_DREQ_SENT: 2123 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2124 break; 2125 case IB_CM_ESTABLISHED: 2126 case IB_CM_MRA_REP_RCVD: 2127 break; 2128 case IB_CM_TIMEWAIT: 2129 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2130 counter[CM_DREQ_COUNTER]); 2131 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2132 goto unlock; 2133 2134 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2135 cm_id_priv->private_data, 2136 cm_id_priv->private_data_len); 2137 spin_unlock_irq(&cm_id_priv->lock); 2138 2139 if (ib_post_send_mad(msg, NULL)) 2140 cm_free_msg(msg); 2141 goto deref; 2142 case IB_CM_DREQ_RCVD: 2143 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2144 counter[CM_DREQ_COUNTER]); 2145 goto unlock; 2146 default: 2147 goto unlock; 2148 } 2149 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2150 cm_id_priv->tid = dreq_msg->hdr.tid; 2151 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2152 if (!ret) 2153 list_add_tail(&work->list, &cm_id_priv->work_list); 2154 spin_unlock_irq(&cm_id_priv->lock); 2155 2156 if (ret) 2157 cm_process_work(cm_id_priv, work); 2158 else 2159 cm_deref_id(cm_id_priv); 2160 return 0; 2161 2162unlock: spin_unlock_irq(&cm_id_priv->lock); 2163deref: cm_deref_id(cm_id_priv); 2164 return -EINVAL; 2165} 2166 2167static int cm_drep_handler(struct cm_work *work) 2168{ 2169 struct cm_id_private *cm_id_priv; 2170 struct cm_drep_msg *drep_msg; 2171 int ret; 2172 2173 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2174 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2175 drep_msg->local_comm_id); 2176 if (!cm_id_priv) 2177 return -EINVAL; 2178 2179 work->cm_event.private_data = &drep_msg->private_data; 2180 2181 spin_lock_irq(&cm_id_priv->lock); 2182 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2183 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2184 spin_unlock_irq(&cm_id_priv->lock); 2185 goto out; 2186 } 2187 cm_enter_timewait(cm_id_priv); 2188 2189 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2190 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2191 if (!ret) 2192 list_add_tail(&work->list, &cm_id_priv->work_list); 2193 spin_unlock_irq(&cm_id_priv->lock); 2194 2195 if (ret) 2196 cm_process_work(cm_id_priv, work); 2197 else 2198 cm_deref_id(cm_id_priv); 2199 return 0; 2200out: 2201 cm_deref_id(cm_id_priv); 2202 return -EINVAL; 2203} 2204 2205int ib_send_cm_rej(struct ib_cm_id *cm_id, 2206 enum ib_cm_rej_reason reason, 2207 void *ari, 2208 u8 ari_length, 2209 const void *private_data, 2210 u8 private_data_len) 2211{ 2212 struct cm_id_private *cm_id_priv; 2213 struct ib_mad_send_buf *msg; 2214 unsigned long flags; 2215 int ret; 2216 2217 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2218 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2219 return -EINVAL; 2220 2221 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2222 2223 spin_lock_irqsave(&cm_id_priv->lock, flags); 2224 switch (cm_id->state) { 2225 case IB_CM_REQ_SENT: 2226 case IB_CM_MRA_REQ_RCVD: 2227 case IB_CM_REQ_RCVD: 2228 case IB_CM_MRA_REQ_SENT: 2229 case IB_CM_REP_RCVD: 2230 case IB_CM_MRA_REP_SENT: 2231 ret = cm_alloc_msg(cm_id_priv, &msg); 2232 if (!ret) 2233 cm_format_rej((struct cm_rej_msg *) msg->mad, 2234 cm_id_priv, reason, ari, ari_length, 2235 private_data, private_data_len); 2236 2237 cm_reset_to_idle(cm_id_priv); 2238 break; 2239 case IB_CM_REP_SENT: 2240 case IB_CM_MRA_REP_RCVD: 2241 ret = cm_alloc_msg(cm_id_priv, &msg); 2242 if (!ret) 2243 cm_format_rej((struct cm_rej_msg *) msg->mad, 2244 cm_id_priv, reason, ari, ari_length, 2245 private_data, private_data_len); 2246 2247 cm_enter_timewait(cm_id_priv); 2248 break; 2249 default: 2250 ret = -EINVAL; 2251 goto out; 2252 } 2253 2254 if (ret) 2255 goto out; 2256 2257 ret = ib_post_send_mad(msg, NULL); 2258 if (ret) 2259 cm_free_msg(msg); 2260 2261out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2262 return ret; 2263} 2264EXPORT_SYMBOL(ib_send_cm_rej); 2265 2266static void cm_format_rej_event(struct cm_work *work) 2267{ 2268 struct cm_rej_msg *rej_msg; 2269 struct ib_cm_rej_event_param *param; 2270 2271 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2272 param = &work->cm_event.param.rej_rcvd; 2273 param->ari = rej_msg->ari; 2274 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2275 param->reason = __be16_to_cpu(rej_msg->reason); 2276 work->cm_event.private_data = &rej_msg->private_data; 2277} 2278 2279static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2280{ 2281 struct cm_timewait_info *timewait_info; 2282 struct cm_id_private *cm_id_priv; 2283 __be32 remote_id; 2284 2285 remote_id = rej_msg->local_comm_id; 2286 2287 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2288 spin_lock_irq(&cm.lock); 2289 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2290 remote_id); 2291 if (!timewait_info) { 2292 spin_unlock_irq(&cm.lock); 2293 return NULL; 2294 } 2295 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2296 (timewait_info->work.local_id ^ 2297 cm.random_id_operand)); 2298 if (cm_id_priv) { 2299 if (cm_id_priv->id.remote_id == remote_id) 2300 atomic_inc(&cm_id_priv->refcount); 2301 else 2302 cm_id_priv = NULL; 2303 } 2304 spin_unlock_irq(&cm.lock); 2305 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2306 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2307 else 2308 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2309 2310 return cm_id_priv; 2311} 2312 2313static int cm_rej_handler(struct cm_work *work) 2314{ 2315 struct cm_id_private *cm_id_priv; 2316 struct cm_rej_msg *rej_msg; 2317 int ret; 2318 2319 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2320 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2321 if (!cm_id_priv) 2322 return -EINVAL; 2323 2324 cm_format_rej_event(work); 2325 2326 spin_lock_irq(&cm_id_priv->lock); 2327 switch (cm_id_priv->id.state) { 2328 case IB_CM_REQ_SENT: 2329 case IB_CM_MRA_REQ_RCVD: 2330 case IB_CM_REP_SENT: 2331 case IB_CM_MRA_REP_RCVD: 2332 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2333 /* fall through */ 2334 case IB_CM_REQ_RCVD: 2335 case IB_CM_MRA_REQ_SENT: 2336 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2337 cm_enter_timewait(cm_id_priv); 2338 else 2339 cm_reset_to_idle(cm_id_priv); 2340 break; 2341 case IB_CM_DREQ_SENT: 2342 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2343 /* fall through */ 2344 case IB_CM_REP_RCVD: 2345 case IB_CM_MRA_REP_SENT: 2346 case IB_CM_ESTABLISHED: 2347 cm_enter_timewait(cm_id_priv); 2348 break; 2349 default: 2350 spin_unlock_irq(&cm_id_priv->lock); 2351 ret = -EINVAL; 2352 goto out; 2353 } 2354 2355 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2356 if (!ret) 2357 list_add_tail(&work->list, &cm_id_priv->work_list); 2358 spin_unlock_irq(&cm_id_priv->lock); 2359 2360 if (ret) 2361 cm_process_work(cm_id_priv, work); 2362 else 2363 cm_deref_id(cm_id_priv); 2364 return 0; 2365out: 2366 cm_deref_id(cm_id_priv); 2367 return -EINVAL; 2368} 2369 2370int ib_send_cm_mra(struct ib_cm_id *cm_id, 2371 u8 service_timeout, 2372 const void *private_data, 2373 u8 private_data_len) 2374{ 2375 struct cm_id_private *cm_id_priv; 2376 struct ib_mad_send_buf *msg; 2377 enum ib_cm_state cm_state; 2378 enum ib_cm_lap_state lap_state; 2379 enum cm_msg_response msg_response; 2380 void *data; 2381 unsigned long flags; 2382 int ret; 2383 2384 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2385 return -EINVAL; 2386 2387 data = cm_copy_private_data(private_data, private_data_len); 2388 if (IS_ERR(data)) 2389 return PTR_ERR(data); 2390 2391 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2392 2393 spin_lock_irqsave(&cm_id_priv->lock, flags); 2394 switch(cm_id_priv->id.state) { 2395 case IB_CM_REQ_RCVD: 2396 cm_state = IB_CM_MRA_REQ_SENT; 2397 lap_state = cm_id->lap_state; 2398 msg_response = CM_MSG_RESPONSE_REQ; 2399 break; 2400 case IB_CM_REP_RCVD: 2401 cm_state = IB_CM_MRA_REP_SENT; 2402 lap_state = cm_id->lap_state; 2403 msg_response = CM_MSG_RESPONSE_REP; 2404 break; 2405 case IB_CM_ESTABLISHED: 2406 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2407 cm_state = cm_id->state; 2408 lap_state = IB_CM_MRA_LAP_SENT; 2409 msg_response = CM_MSG_RESPONSE_OTHER; 2410 break; 2411 } 2412 default: 2413 ret = -EINVAL; 2414 goto error1; 2415 } 2416 2417 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2418 ret = cm_alloc_msg(cm_id_priv, &msg); 2419 if (ret) 2420 goto error1; 2421 2422 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2423 msg_response, service_timeout, 2424 private_data, private_data_len); 2425 ret = ib_post_send_mad(msg, NULL); 2426 if (ret) 2427 goto error2; 2428 } 2429 2430 cm_id->state = cm_state; 2431 cm_id->lap_state = lap_state; 2432 cm_id_priv->service_timeout = service_timeout; 2433 cm_set_private_data(cm_id_priv, data, private_data_len); 2434 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2435 return 0; 2436 2437error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2438 kfree(data); 2439 return ret; 2440 2441error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2442 kfree(data); 2443 cm_free_msg(msg); 2444 return ret; 2445} 2446EXPORT_SYMBOL(ib_send_cm_mra); 2447 2448static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2449{ 2450 switch (cm_mra_get_msg_mraed(mra_msg)) { 2451 case CM_MSG_RESPONSE_REQ: 2452 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2453 case CM_MSG_RESPONSE_REP: 2454 case CM_MSG_RESPONSE_OTHER: 2455 return cm_acquire_id(mra_msg->remote_comm_id, 2456 mra_msg->local_comm_id); 2457 default: 2458 return NULL; 2459 } 2460} 2461 2462static int cm_mra_handler(struct cm_work *work) 2463{ 2464 struct cm_id_private *cm_id_priv; 2465 struct cm_mra_msg *mra_msg; 2466 int timeout, ret; 2467 2468 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2469 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2470 if (!cm_id_priv) 2471 return -EINVAL; 2472 2473 work->cm_event.private_data = &mra_msg->private_data; 2474 work->cm_event.param.mra_rcvd.service_timeout = 2475 cm_mra_get_service_timeout(mra_msg); 2476 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2477 cm_convert_to_ms(cm_id_priv->av.timeout); 2478 2479 spin_lock_irq(&cm_id_priv->lock); 2480 switch (cm_id_priv->id.state) { 2481 case IB_CM_REQ_SENT: 2482 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2483 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2484 cm_id_priv->msg, timeout)) 2485 goto out; 2486 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2487 break; 2488 case IB_CM_REP_SENT: 2489 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2490 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2491 cm_id_priv->msg, timeout)) 2492 goto out; 2493 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2494 break; 2495 case IB_CM_ESTABLISHED: 2496 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2497 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2498 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2499 cm_id_priv->msg, timeout)) { 2500 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2501 atomic_long_inc(&work->port-> 2502 counter_group[CM_RECV_DUPLICATES]. 2503 counter[CM_MRA_COUNTER]); 2504 goto out; 2505 } 2506 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2507 break; 2508 case IB_CM_MRA_REQ_RCVD: 2509 case IB_CM_MRA_REP_RCVD: 2510 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2511 counter[CM_MRA_COUNTER]); 2512 /* fall through */ 2513 default: 2514 goto out; 2515 } 2516 2517 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2518 cm_id_priv->id.state; 2519 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2520 if (!ret) 2521 list_add_tail(&work->list, &cm_id_priv->work_list); 2522 spin_unlock_irq(&cm_id_priv->lock); 2523 2524 if (ret) 2525 cm_process_work(cm_id_priv, work); 2526 else 2527 cm_deref_id(cm_id_priv); 2528 return 0; 2529out: 2530 spin_unlock_irq(&cm_id_priv->lock); 2531 cm_deref_id(cm_id_priv); 2532 return -EINVAL; 2533} 2534 2535static void cm_format_lap(struct cm_lap_msg *lap_msg, 2536 struct cm_id_private *cm_id_priv, 2537 struct ib_sa_path_rec *alternate_path, 2538 const void *private_data, 2539 u8 private_data_len) 2540{ 2541 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2542 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2543 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2544 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2545 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2546 /* todo: need remote CM response timeout */ 2547 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2548 lap_msg->alt_local_lid = alternate_path->slid; 2549 lap_msg->alt_remote_lid = alternate_path->dlid; 2550 lap_msg->alt_local_gid = alternate_path->sgid; 2551 lap_msg->alt_remote_gid = alternate_path->dgid; 2552 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2553 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2554 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2555 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2556 cm_lap_set_sl(lap_msg, alternate_path->sl); 2557 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2558 cm_lap_set_local_ack_timeout(lap_msg, 2559 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2560 alternate_path->packet_life_time)); 2561 2562 if (private_data && private_data_len) 2563 memcpy(lap_msg->private_data, private_data, private_data_len); 2564} 2565 2566int ib_send_cm_lap(struct ib_cm_id *cm_id, 2567 struct ib_sa_path_rec *alternate_path, 2568 const void *private_data, 2569 u8 private_data_len) 2570{ 2571 struct cm_id_private *cm_id_priv; 2572 struct ib_mad_send_buf *msg; 2573 unsigned long flags; 2574 int ret; 2575 2576 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2577 return -EINVAL; 2578 2579 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2580 spin_lock_irqsave(&cm_id_priv->lock, flags); 2581 if (cm_id->state != IB_CM_ESTABLISHED || 2582 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2583 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2584 ret = -EINVAL; 2585 goto out; 2586 } 2587 2588 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2589 if (ret) 2590 goto out; 2591 cm_id_priv->alt_av.timeout = 2592 cm_ack_timeout(cm_id_priv->target_ack_delay, 2593 cm_id_priv->alt_av.timeout - 1); 2594 2595 ret = cm_alloc_msg(cm_id_priv, &msg); 2596 if (ret) 2597 goto out; 2598 2599 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2600 alternate_path, private_data, private_data_len); 2601 msg->timeout_ms = cm_id_priv->timeout_ms; 2602 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2603 2604 ret = ib_post_send_mad(msg, NULL); 2605 if (ret) { 2606 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2607 cm_free_msg(msg); 2608 return ret; 2609 } 2610 2611 cm_id->lap_state = IB_CM_LAP_SENT; 2612 cm_id_priv->msg = msg; 2613 2614out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2615 return ret; 2616} 2617EXPORT_SYMBOL(ib_send_cm_lap); 2618 2619static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2620 struct ib_sa_path_rec *path, 2621 struct cm_lap_msg *lap_msg) 2622{ 2623 memset(path, 0, sizeof *path); 2624 path->dgid = lap_msg->alt_local_gid; 2625 path->sgid = lap_msg->alt_remote_gid; 2626 path->dlid = lap_msg->alt_local_lid; 2627 path->slid = lap_msg->alt_remote_lid; 2628 path->flow_label = cm_lap_get_flow_label(lap_msg); 2629 path->hop_limit = lap_msg->alt_hop_limit; 2630 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2631 path->reversible = 1; 2632 path->pkey = cm_id_priv->pkey; 2633 path->sl = cm_lap_get_sl(lap_msg); 2634 path->mtu_selector = IB_SA_EQ; 2635 path->mtu = cm_id_priv->path_mtu; 2636 path->rate_selector = IB_SA_EQ; 2637 path->rate = cm_lap_get_packet_rate(lap_msg); 2638 path->packet_life_time_selector = IB_SA_EQ; 2639 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2640 path->packet_life_time -= (path->packet_life_time > 0); 2641} 2642 2643static int cm_lap_handler(struct cm_work *work) 2644{ 2645 struct cm_id_private *cm_id_priv; 2646 struct cm_lap_msg *lap_msg; 2647 struct ib_cm_lap_event_param *param; 2648 struct ib_mad_send_buf *msg = NULL; 2649 int ret; 2650 2651 /* todo: verify LAP request and send reject APR if invalid. */ 2652 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2653 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2654 lap_msg->local_comm_id); 2655 if (!cm_id_priv) 2656 return -EINVAL; 2657 2658 param = &work->cm_event.param.lap_rcvd; 2659 param->alternate_path = &work->path[0]; 2660 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2661 work->cm_event.private_data = &lap_msg->private_data; 2662 2663 spin_lock_irq(&cm_id_priv->lock); 2664 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2665 goto unlock; 2666 2667 switch (cm_id_priv->id.lap_state) { 2668 case IB_CM_LAP_UNINIT: 2669 case IB_CM_LAP_IDLE: 2670 break; 2671 case IB_CM_MRA_LAP_SENT: 2672 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2673 counter[CM_LAP_COUNTER]); 2674 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2675 goto unlock; 2676 2677 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2678 CM_MSG_RESPONSE_OTHER, 2679 cm_id_priv->service_timeout, 2680 cm_id_priv->private_data, 2681 cm_id_priv->private_data_len); 2682 spin_unlock_irq(&cm_id_priv->lock); 2683 2684 if (ib_post_send_mad(msg, NULL)) 2685 cm_free_msg(msg); 2686 goto deref; 2687 case IB_CM_LAP_RCVD: 2688 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2689 counter[CM_LAP_COUNTER]); 2690 goto unlock; 2691 default: 2692 goto unlock; 2693 } 2694 2695 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2696 cm_id_priv->tid = lap_msg->hdr.tid; 2697 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2698 work->mad_recv_wc->recv_buf.grh, 2699 &cm_id_priv->av); 2700 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2701 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2702 if (!ret) 2703 list_add_tail(&work->list, &cm_id_priv->work_list); 2704 spin_unlock_irq(&cm_id_priv->lock); 2705 2706 if (ret) 2707 cm_process_work(cm_id_priv, work); 2708 else 2709 cm_deref_id(cm_id_priv); 2710 return 0; 2711 2712unlock: spin_unlock_irq(&cm_id_priv->lock); 2713deref: cm_deref_id(cm_id_priv); 2714 return -EINVAL; 2715} 2716 2717static void cm_format_apr(struct cm_apr_msg *apr_msg, 2718 struct cm_id_private *cm_id_priv, 2719 enum ib_cm_apr_status status, 2720 void *info, 2721 u8 info_length, 2722 const void *private_data, 2723 u8 private_data_len) 2724{ 2725 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2726 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2727 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2728 apr_msg->ap_status = (u8) status; 2729 2730 if (info && info_length) { 2731 apr_msg->info_length = info_length; 2732 memcpy(apr_msg->info, info, info_length); 2733 } 2734 2735 if (private_data && private_data_len) 2736 memcpy(apr_msg->private_data, private_data, private_data_len); 2737} 2738 2739int ib_send_cm_apr(struct ib_cm_id *cm_id, 2740 enum ib_cm_apr_status status, 2741 void *info, 2742 u8 info_length, 2743 const void *private_data, 2744 u8 private_data_len) 2745{ 2746 struct cm_id_private *cm_id_priv; 2747 struct ib_mad_send_buf *msg; 2748 unsigned long flags; 2749 int ret; 2750 2751 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2752 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2753 return -EINVAL; 2754 2755 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2756 spin_lock_irqsave(&cm_id_priv->lock, flags); 2757 if (cm_id->state != IB_CM_ESTABLISHED || 2758 (cm_id->lap_state != IB_CM_LAP_RCVD && 2759 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2760 ret = -EINVAL; 2761 goto out; 2762 } 2763 2764 ret = cm_alloc_msg(cm_id_priv, &msg); 2765 if (ret) 2766 goto out; 2767 2768 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2769 info, info_length, private_data, private_data_len); 2770 ret = ib_post_send_mad(msg, NULL); 2771 if (ret) { 2772 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2773 cm_free_msg(msg); 2774 return ret; 2775 } 2776 2777 cm_id->lap_state = IB_CM_LAP_IDLE; 2778out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2779 return ret; 2780} 2781EXPORT_SYMBOL(ib_send_cm_apr); 2782 2783static int cm_apr_handler(struct cm_work *work) 2784{ 2785 struct cm_id_private *cm_id_priv; 2786 struct cm_apr_msg *apr_msg; 2787 int ret; 2788 2789 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2790 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2791 apr_msg->local_comm_id); 2792 if (!cm_id_priv) 2793 return -EINVAL; /* Unmatched reply. */ 2794 2795 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2796 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2797 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2798 work->cm_event.private_data = &apr_msg->private_data; 2799 2800 spin_lock_irq(&cm_id_priv->lock); 2801 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2802 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2803 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2804 spin_unlock_irq(&cm_id_priv->lock); 2805 goto out; 2806 } 2807 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2808 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2809 cm_id_priv->msg = NULL; 2810 2811 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2812 if (!ret) 2813 list_add_tail(&work->list, &cm_id_priv->work_list); 2814 spin_unlock_irq(&cm_id_priv->lock); 2815 2816 if (ret) 2817 cm_process_work(cm_id_priv, work); 2818 else 2819 cm_deref_id(cm_id_priv); 2820 return 0; 2821out: 2822 cm_deref_id(cm_id_priv); 2823 return -EINVAL; 2824} 2825 2826static int cm_timewait_handler(struct cm_work *work) 2827{ 2828 struct cm_timewait_info *timewait_info; 2829 struct cm_id_private *cm_id_priv; 2830 int ret; 2831 2832 timewait_info = (struct cm_timewait_info *)work; 2833 spin_lock_irq(&cm.lock); 2834 list_del(&timewait_info->list); 2835 spin_unlock_irq(&cm.lock); 2836 2837 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2838 timewait_info->work.remote_id); 2839 if (!cm_id_priv) 2840 return -EINVAL; 2841 2842 spin_lock_irq(&cm_id_priv->lock); 2843 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2844 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2845 spin_unlock_irq(&cm_id_priv->lock); 2846 goto out; 2847 } 2848 cm_id_priv->id.state = IB_CM_IDLE; 2849 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2850 if (!ret) 2851 list_add_tail(&work->list, &cm_id_priv->work_list); 2852 spin_unlock_irq(&cm_id_priv->lock); 2853 2854 if (ret) 2855 cm_process_work(cm_id_priv, work); 2856 else 2857 cm_deref_id(cm_id_priv); 2858 return 0; 2859out: 2860 cm_deref_id(cm_id_priv); 2861 return -EINVAL; 2862} 2863 2864static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2865 struct cm_id_private *cm_id_priv, 2866 struct ib_cm_sidr_req_param *param) 2867{ 2868 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2869 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2870 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2871 sidr_req_msg->pkey = param->path->pkey; 2872 sidr_req_msg->service_id = param->service_id; 2873 2874 if (param->private_data && param->private_data_len) 2875 memcpy(sidr_req_msg->private_data, param->private_data, 2876 param->private_data_len); 2877} 2878 2879int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2880 struct ib_cm_sidr_req_param *param) 2881{ 2882 struct cm_id_private *cm_id_priv; 2883 struct ib_mad_send_buf *msg; 2884 unsigned long flags; 2885 int ret; 2886 2887 if (!param->path || (param->private_data && 2888 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2889 return -EINVAL; 2890 2891 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2892 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2893 if (ret) 2894 goto out; 2895 2896 cm_id->service_id = param->service_id; 2897 cm_id->service_mask = ~cpu_to_be64(0); 2898 cm_id_priv->timeout_ms = param->timeout_ms; 2899 cm_id_priv->max_cm_retries = param->max_cm_retries; 2900 ret = cm_alloc_msg(cm_id_priv, &msg); 2901 if (ret) 2902 goto out; 2903 2904 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2905 param); 2906 msg->timeout_ms = cm_id_priv->timeout_ms; 2907 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2908 2909 spin_lock_irqsave(&cm_id_priv->lock, flags); 2910 if (cm_id->state == IB_CM_IDLE) 2911 ret = ib_post_send_mad(msg, NULL); 2912 else 2913 ret = -EINVAL; 2914 2915 if (ret) { 2916 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2917 cm_free_msg(msg); 2918 goto out; 2919 } 2920 cm_id->state = IB_CM_SIDR_REQ_SENT; 2921 cm_id_priv->msg = msg; 2922 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2923out: 2924 return ret; 2925} 2926EXPORT_SYMBOL(ib_send_cm_sidr_req); 2927 2928static void cm_format_sidr_req_event(struct cm_work *work, 2929 struct ib_cm_id *listen_id) 2930{ 2931 struct cm_sidr_req_msg *sidr_req_msg; 2932 struct ib_cm_sidr_req_event_param *param; 2933 2934 sidr_req_msg = (struct cm_sidr_req_msg *) 2935 work->mad_recv_wc->recv_buf.mad; 2936 param = &work->cm_event.param.sidr_req_rcvd; 2937 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2938 param->listen_id = listen_id; 2939 param->port = work->port->port_num; 2940 work->cm_event.private_data = &sidr_req_msg->private_data; 2941} 2942 2943static int cm_sidr_req_handler(struct cm_work *work) 2944{ 2945 struct ib_cm_id *cm_id; 2946 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2947 struct cm_sidr_req_msg *sidr_req_msg; 2948 struct ib_wc *wc; 2949 2950 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2951 if (IS_ERR(cm_id)) 2952 return PTR_ERR(cm_id); 2953 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2954 2955 /* Record SGID/SLID and request ID for lookup. */ 2956 sidr_req_msg = (struct cm_sidr_req_msg *) 2957 work->mad_recv_wc->recv_buf.mad; 2958 wc = work->mad_recv_wc->wc; 2959 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2960 cm_id_priv->av.dgid.global.interface_id = 0; 2961 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2962 work->mad_recv_wc->recv_buf.grh, 2963 &cm_id_priv->av); 2964 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2965 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2966 atomic_inc(&cm_id_priv->work_count); 2967 2968 spin_lock_irq(&cm.lock); 2969 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2970 if (cur_cm_id_priv) { 2971 spin_unlock_irq(&cm.lock); 2972 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2973 counter[CM_SIDR_REQ_COUNTER]); 2974 goto out; /* Duplicate message. */ 2975 } 2976 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2977 cur_cm_id_priv = cm_find_listen(cm_id->device, 2978 sidr_req_msg->service_id, 2979 sidr_req_msg->private_data); 2980 if (!cur_cm_id_priv) { 2981 spin_unlock_irq(&cm.lock); 2982 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2983 goto out; /* No match. */ 2984 } 2985 atomic_inc(&cur_cm_id_priv->refcount); 2986 spin_unlock_irq(&cm.lock); 2987 2988 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2989 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2990 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2991 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2992 2993 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2994 cm_process_work(cm_id_priv, work); 2995 cm_deref_id(cur_cm_id_priv); 2996 return 0; 2997out: 2998 ib_destroy_cm_id(&cm_id_priv->id); 2999 return -EINVAL; 3000} 3001 3002static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3003 struct cm_id_private *cm_id_priv, 3004 struct ib_cm_sidr_rep_param *param) 3005{ 3006 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3007 cm_id_priv->tid); 3008 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3009 sidr_rep_msg->status = param->status; 3010 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3011 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3012 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3013 3014 if (param->info && param->info_length) 3015 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3016 3017 if (param->private_data && param->private_data_len) 3018 memcpy(sidr_rep_msg->private_data, param->private_data, 3019 param->private_data_len); 3020} 3021 3022int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3023 struct ib_cm_sidr_rep_param *param) 3024{ 3025 struct cm_id_private *cm_id_priv; 3026 struct ib_mad_send_buf *msg; 3027 unsigned long flags; 3028 int ret; 3029 3030 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3031 (param->private_data && 3032 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3033 return -EINVAL; 3034 3035 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3036 spin_lock_irqsave(&cm_id_priv->lock, flags); 3037 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3038 ret = -EINVAL; 3039 goto error; 3040 } 3041 3042 ret = cm_alloc_msg(cm_id_priv, &msg); 3043 if (ret) 3044 goto error; 3045 3046 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3047 param); 3048 ret = ib_post_send_mad(msg, NULL); 3049 if (ret) { 3050 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3051 cm_free_msg(msg); 3052 return ret; 3053 } 3054 cm_id->state = IB_CM_IDLE; 3055 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3056 3057 spin_lock_irqsave(&cm.lock, flags); 3058 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3059 spin_unlock_irqrestore(&cm.lock, flags); 3060 return 0; 3061 3062error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3063 return ret; 3064} 3065EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3066 3067static void cm_format_sidr_rep_event(struct cm_work *work) 3068{ 3069 struct cm_sidr_rep_msg *sidr_rep_msg; 3070 struct ib_cm_sidr_rep_event_param *param; 3071 3072 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3073 work->mad_recv_wc->recv_buf.mad; 3074 param = &work->cm_event.param.sidr_rep_rcvd; 3075 param->status = sidr_rep_msg->status; 3076 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3077 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3078 param->info = &sidr_rep_msg->info; 3079 param->info_len = sidr_rep_msg->info_length; 3080 work->cm_event.private_data = &sidr_rep_msg->private_data; 3081} 3082 3083static int cm_sidr_rep_handler(struct cm_work *work) 3084{ 3085 struct cm_sidr_rep_msg *sidr_rep_msg; 3086 struct cm_id_private *cm_id_priv; 3087 3088 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3089 work->mad_recv_wc->recv_buf.mad; 3090 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3091 if (!cm_id_priv) 3092 return -EINVAL; /* Unmatched reply. */ 3093 3094 spin_lock_irq(&cm_id_priv->lock); 3095 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3096 spin_unlock_irq(&cm_id_priv->lock); 3097 goto out; 3098 } 3099 cm_id_priv->id.state = IB_CM_IDLE; 3100 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3101 spin_unlock_irq(&cm_id_priv->lock); 3102 3103 cm_format_sidr_rep_event(work); 3104 cm_process_work(cm_id_priv, work); 3105 return 0; 3106out: 3107 cm_deref_id(cm_id_priv); 3108 return -EINVAL; 3109} 3110 3111static void cm_process_send_error(struct ib_mad_send_buf *msg, 3112 enum ib_wc_status wc_status) 3113{ 3114 struct cm_id_private *cm_id_priv; 3115 struct ib_cm_event cm_event; 3116 enum ib_cm_state state; 3117 int ret; 3118 3119 memset(&cm_event, 0, sizeof cm_event); 3120 cm_id_priv = msg->context[0]; 3121 3122 /* Discard old sends or ones without a response. */ 3123 spin_lock_irq(&cm_id_priv->lock); 3124 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3125 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3126 goto discard; 3127 3128 switch (state) { 3129 case IB_CM_REQ_SENT: 3130 case IB_CM_MRA_REQ_RCVD: 3131 cm_reset_to_idle(cm_id_priv); 3132 cm_event.event = IB_CM_REQ_ERROR; 3133 break; 3134 case IB_CM_REP_SENT: 3135 case IB_CM_MRA_REP_RCVD: 3136 cm_reset_to_idle(cm_id_priv); 3137 cm_event.event = IB_CM_REP_ERROR; 3138 break; 3139 case IB_CM_DREQ_SENT: 3140 cm_enter_timewait(cm_id_priv); 3141 cm_event.event = IB_CM_DREQ_ERROR; 3142 break; 3143 case IB_CM_SIDR_REQ_SENT: 3144 cm_id_priv->id.state = IB_CM_IDLE; 3145 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3146 break; 3147 default: 3148 goto discard; 3149 } 3150 spin_unlock_irq(&cm_id_priv->lock); 3151 cm_event.param.send_status = wc_status; 3152 3153 /* No other events can occur on the cm_id at this point. */ 3154 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3155 cm_free_msg(msg); 3156 if (ret) 3157 ib_destroy_cm_id(&cm_id_priv->id); 3158 return; 3159discard: 3160 spin_unlock_irq(&cm_id_priv->lock); 3161 cm_free_msg(msg); 3162} 3163 3164static void cm_send_handler(struct ib_mad_agent *mad_agent, 3165 struct ib_mad_send_wc *mad_send_wc) 3166{ 3167 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3168 struct cm_port *port; 3169 u16 attr_index; 3170 3171 port = mad_agent->context; 3172 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3173 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3174 3175 /* 3176 * If the send was in response to a received message (context[0] is not 3177 * set to a cm_id), and is not a REJ, then it is a send that was 3178 * manually retried. 3179 */ 3180 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3181 msg->retries = 1; 3182 3183 atomic_long_add(1 + msg->retries, 3184 &port->counter_group[CM_XMIT].counter[attr_index]); 3185 if (msg->retries) 3186 atomic_long_add(msg->retries, 3187 &port->counter_group[CM_XMIT_RETRIES]. 3188 counter[attr_index]); 3189 3190 switch (mad_send_wc->status) { 3191 case IB_WC_SUCCESS: 3192 case IB_WC_WR_FLUSH_ERR: 3193 cm_free_msg(msg); 3194 break; 3195 default: 3196 if (msg->context[0] && msg->context[1]) 3197 cm_process_send_error(msg, mad_send_wc->status); 3198 else 3199 cm_free_msg(msg); 3200 break; 3201 } 3202} 3203 3204static void cm_work_handler(struct work_struct *_work) 3205{ 3206 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3207 int ret; 3208 3209 switch (work->cm_event.event) { 3210 case IB_CM_REQ_RECEIVED: 3211 ret = cm_req_handler(work); 3212 break; 3213 case IB_CM_MRA_RECEIVED: 3214 ret = cm_mra_handler(work); 3215 break; 3216 case IB_CM_REJ_RECEIVED: 3217 ret = cm_rej_handler(work); 3218 break; 3219 case IB_CM_REP_RECEIVED: 3220 ret = cm_rep_handler(work); 3221 break; 3222 case IB_CM_RTU_RECEIVED: 3223 ret = cm_rtu_handler(work); 3224 break; 3225 case IB_CM_USER_ESTABLISHED: 3226 ret = cm_establish_handler(work); 3227 break; 3228 case IB_CM_DREQ_RECEIVED: 3229 ret = cm_dreq_handler(work); 3230 break; 3231 case IB_CM_DREP_RECEIVED: 3232 ret = cm_drep_handler(work); 3233 break; 3234 case IB_CM_SIDR_REQ_RECEIVED: 3235 ret = cm_sidr_req_handler(work); 3236 break; 3237 case IB_CM_SIDR_REP_RECEIVED: 3238 ret = cm_sidr_rep_handler(work); 3239 break; 3240 case IB_CM_LAP_RECEIVED: 3241 ret = cm_lap_handler(work); 3242 break; 3243 case IB_CM_APR_RECEIVED: 3244 ret = cm_apr_handler(work); 3245 break; 3246 case IB_CM_TIMEWAIT_EXIT: 3247 ret = cm_timewait_handler(work); 3248 break; 3249 default: 3250 ret = -EINVAL; 3251 break; 3252 } 3253 if (ret) 3254 cm_free_work(work); 3255} 3256 3257static int cm_establish(struct ib_cm_id *cm_id) 3258{ 3259 struct cm_id_private *cm_id_priv; 3260 struct cm_work *work; 3261 unsigned long flags; 3262 int ret = 0; 3263 3264 work = kmalloc(sizeof *work, GFP_ATOMIC); 3265 if (!work) 3266 return -ENOMEM; 3267 3268 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3269 spin_lock_irqsave(&cm_id_priv->lock, flags); 3270 switch (cm_id->state) 3271 { 3272 case IB_CM_REP_SENT: 3273 case IB_CM_MRA_REP_RCVD: 3274 cm_id->state = IB_CM_ESTABLISHED; 3275 break; 3276 case IB_CM_ESTABLISHED: 3277 ret = -EISCONN; 3278 break; 3279 default: 3280 ret = -EINVAL; 3281 break; 3282 } 3283 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3284 3285 if (ret) { 3286 kfree(work); 3287 goto out; 3288 } 3289 3290 /* 3291 * The CM worker thread may try to destroy the cm_id before it 3292 * can execute this work item. To prevent potential deadlock, 3293 * we need to find the cm_id once we're in the context of the 3294 * worker thread, rather than holding a reference on it. 3295 */ 3296 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3297 work->local_id = cm_id->local_id; 3298 work->remote_id = cm_id->remote_id; 3299 work->mad_recv_wc = NULL; 3300 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3301 queue_delayed_work(cm.wq, &work->work, 0); 3302out: 3303 return ret; 3304} 3305 3306static int cm_migrate(struct ib_cm_id *cm_id) 3307{ 3308 struct cm_id_private *cm_id_priv; 3309 unsigned long flags; 3310 int ret = 0; 3311 3312 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3313 spin_lock_irqsave(&cm_id_priv->lock, flags); 3314 if (cm_id->state == IB_CM_ESTABLISHED && 3315 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3316 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3317 cm_id->lap_state = IB_CM_LAP_IDLE; 3318 cm_id_priv->av = cm_id_priv->alt_av; 3319 } else 3320 ret = -EINVAL; 3321 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3322 3323 return ret; 3324} 3325 3326int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3327{ 3328 int ret; 3329 3330 switch (event) { 3331 case IB_EVENT_COMM_EST: 3332 ret = cm_establish(cm_id); 3333 break; 3334 case IB_EVENT_PATH_MIG: 3335 ret = cm_migrate(cm_id); 3336 break; 3337 default: 3338 ret = -EINVAL; 3339 } 3340 return ret; 3341} 3342EXPORT_SYMBOL(ib_cm_notify); 3343 3344static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3345 struct ib_mad_recv_wc *mad_recv_wc) 3346{ 3347 struct cm_port *port = mad_agent->context; 3348 struct cm_work *work; 3349 enum ib_cm_event_type event; 3350 u16 attr_id; 3351 int paths = 0; 3352 3353 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3354 case CM_REQ_ATTR_ID: 3355 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3356 alt_local_lid != 0); 3357 event = IB_CM_REQ_RECEIVED; 3358 break; 3359 case CM_MRA_ATTR_ID: 3360 event = IB_CM_MRA_RECEIVED; 3361 break; 3362 case CM_REJ_ATTR_ID: 3363 event = IB_CM_REJ_RECEIVED; 3364 break; 3365 case CM_REP_ATTR_ID: 3366 event = IB_CM_REP_RECEIVED; 3367 break; 3368 case CM_RTU_ATTR_ID: 3369 event = IB_CM_RTU_RECEIVED; 3370 break; 3371 case CM_DREQ_ATTR_ID: 3372 event = IB_CM_DREQ_RECEIVED; 3373 break; 3374 case CM_DREP_ATTR_ID: 3375 event = IB_CM_DREP_RECEIVED; 3376 break; 3377 case CM_SIDR_REQ_ATTR_ID: 3378 event = IB_CM_SIDR_REQ_RECEIVED; 3379 break; 3380 case CM_SIDR_REP_ATTR_ID: 3381 event = IB_CM_SIDR_REP_RECEIVED; 3382 break; 3383 case CM_LAP_ATTR_ID: 3384 paths = 1; 3385 event = IB_CM_LAP_RECEIVED; 3386 break; 3387 case CM_APR_ATTR_ID: 3388 event = IB_CM_APR_RECEIVED; 3389 break; 3390 default: 3391 ib_free_recv_mad(mad_recv_wc); 3392 return; 3393 } 3394 3395 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3396 atomic_long_inc(&port->counter_group[CM_RECV]. 3397 counter[attr_id - CM_ATTR_ID_OFFSET]); 3398 3399 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3400 GFP_KERNEL); 3401 if (!work) { 3402 ib_free_recv_mad(mad_recv_wc); 3403 return; 3404 } 3405 3406 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3407 work->cm_event.event = event; 3408 work->mad_recv_wc = mad_recv_wc; 3409 work->port = port; 3410 queue_delayed_work(cm.wq, &work->work, 0); 3411} 3412 3413static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3414 struct ib_qp_attr *qp_attr, 3415 int *qp_attr_mask) 3416{ 3417 unsigned long flags; 3418 int ret; 3419 3420 spin_lock_irqsave(&cm_id_priv->lock, flags); 3421 switch (cm_id_priv->id.state) { 3422 case IB_CM_REQ_SENT: 3423 case IB_CM_MRA_REQ_RCVD: 3424 case IB_CM_REQ_RCVD: 3425 case IB_CM_MRA_REQ_SENT: 3426 case IB_CM_REP_RCVD: 3427 case IB_CM_MRA_REP_SENT: 3428 case IB_CM_REP_SENT: 3429 case IB_CM_MRA_REP_RCVD: 3430 case IB_CM_ESTABLISHED: 3431 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3432 IB_QP_PKEY_INDEX | IB_QP_PORT; 3433 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3434 if (cm_id_priv->responder_resources) 3435 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3436 IB_ACCESS_REMOTE_ATOMIC; 3437 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3438 qp_attr->port_num = cm_id_priv->av.port->port_num; 3439 ret = 0; 3440 break; 3441 default: 3442 ret = -EINVAL; 3443 break; 3444 } 3445 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3446 return ret; 3447} 3448 3449static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3450 struct ib_qp_attr *qp_attr, 3451 int *qp_attr_mask) 3452{ 3453 unsigned long flags; 3454 int ret; 3455 3456 spin_lock_irqsave(&cm_id_priv->lock, flags); 3457 switch (cm_id_priv->id.state) { 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_AV | IB_QP_PATH_MTU | 3466 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3467 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3468 qp_attr->path_mtu = cm_id_priv->path_mtu; 3469 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3470 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3471 if (cm_id_priv->qp_type == IB_QPT_RC) { 3472 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3473 IB_QP_MIN_RNR_TIMER; 3474 qp_attr->max_dest_rd_atomic = 3475 cm_id_priv->responder_resources; 3476 qp_attr->min_rnr_timer = 0; 3477 } 3478 if (cm_id_priv->alt_av.ah_attr.dlid) { 3479 *qp_attr_mask |= IB_QP_ALT_PATH; 3480 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3481 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3482 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3483 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3484 } 3485 ret = 0; 3486 break; 3487 default: 3488 ret = -EINVAL; 3489 break; 3490 } 3491 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3492 return ret; 3493} 3494 3495static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3496 struct ib_qp_attr *qp_attr, 3497 int *qp_attr_mask) 3498{ 3499 unsigned long flags; 3500 int ret; 3501 3502 spin_lock_irqsave(&cm_id_priv->lock, flags); 3503 switch (cm_id_priv->id.state) { 3504 /* Allow transition to RTS before sending REP */ 3505 case IB_CM_REQ_RCVD: 3506 case IB_CM_MRA_REQ_SENT: 3507 3508 case IB_CM_REP_RCVD: 3509 case IB_CM_MRA_REP_SENT: 3510 case IB_CM_REP_SENT: 3511 case IB_CM_MRA_REP_RCVD: 3512 case IB_CM_ESTABLISHED: 3513 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3514 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3515 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3516 if (cm_id_priv->qp_type == IB_QPT_RC) { 3517 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3518 IB_QP_RNR_RETRY | 3519 IB_QP_MAX_QP_RD_ATOMIC; 3520 qp_attr->timeout = cm_id_priv->av.timeout; 3521 qp_attr->retry_cnt = cm_id_priv->retry_count; 3522 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3523 qp_attr->max_rd_atomic = 3524 cm_id_priv->initiator_depth; 3525 } 3526 if (cm_id_priv->alt_av.ah_attr.dlid) { 3527 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3528 qp_attr->path_mig_state = IB_MIG_REARM; 3529 } 3530 } else { 3531 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3532 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3533 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3534 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3535 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3536 qp_attr->path_mig_state = IB_MIG_REARM; 3537 } 3538 ret = 0; 3539 break; 3540 default: 3541 ret = -EINVAL; 3542 break; 3543 } 3544 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3545 return ret; 3546} 3547 3548int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3549 struct ib_qp_attr *qp_attr, 3550 int *qp_attr_mask) 3551{ 3552 struct cm_id_private *cm_id_priv; 3553 int ret; 3554 3555 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3556 switch (qp_attr->qp_state) { 3557 case IB_QPS_INIT: 3558 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3559 break; 3560 case IB_QPS_RTR: 3561 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3562 break; 3563 case IB_QPS_RTS: 3564 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3565 break; 3566 default: 3567 ret = -EINVAL; 3568 break; 3569 } 3570 return ret; 3571} 3572EXPORT_SYMBOL(ib_cm_init_qp_attr); 3573 3574static void cm_get_ack_delay(struct cm_device *cm_dev) 3575{ 3576 struct ib_device_attr attr; 3577 3578 if (ib_query_device(cm_dev->ib_device, &attr)) 3579 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3580 else 3581 cm_dev->ack_delay = attr.local_ca_ack_delay; 3582} 3583 3584static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3585 char *buf) 3586{ 3587 struct cm_counter_group *group; 3588 struct cm_counter_attribute *cm_attr; 3589 3590 group = container_of(obj, struct cm_counter_group, obj); 3591 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3592 3593 return sprintf(buf, "%ld\n", 3594 atomic_long_read(&group->counter[cm_attr->index])); 3595} 3596 3597static const struct sysfs_ops cm_counter_ops = { 3598 .show = cm_show_counter 3599}; 3600 3601static struct kobj_type cm_counter_obj_type = { 3602 .sysfs_ops = &cm_counter_ops, 3603 .default_attrs = cm_counter_default_attrs 3604}; 3605 3606static void cm_release_port_obj(struct kobject *obj) 3607{ 3608 struct cm_port *cm_port; 3609 3610 cm_port = container_of(obj, struct cm_port, port_obj); 3611 kfree(cm_port); 3612} 3613 3614static struct kobj_type cm_port_obj_type = { 3615 .release = cm_release_port_obj 3616}; 3617 3618struct class cm_class = { 3619 .name = "infiniband_cm", 3620}; 3621EXPORT_SYMBOL(cm_class); 3622 3623static int cm_create_port_fs(struct cm_port *port) 3624{ 3625 int i, ret; 3626 3627 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3628 &port->cm_dev->device->kobj, 3629 "%d", port->port_num); 3630 if (ret) { 3631 kfree(port); 3632 return ret; 3633 } 3634 3635 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3636 ret = kobject_init_and_add(&port->counter_group[i].obj, 3637 &cm_counter_obj_type, 3638 &port->port_obj, 3639 "%s", counter_group_names[i]); 3640 if (ret) 3641 goto error; 3642 } 3643 3644 return 0; 3645 3646error: 3647 while (i--) 3648 kobject_put(&port->counter_group[i].obj); 3649 kobject_put(&port->port_obj); 3650 return ret; 3651 3652} 3653 3654static void cm_remove_port_fs(struct cm_port *port) 3655{ 3656 int i; 3657 3658 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3659 kobject_put(&port->counter_group[i].obj); 3660 3661 kobject_put(&port->port_obj); 3662} 3663 3664static void cm_add_one(struct ib_device *ib_device) 3665{ 3666 struct cm_device *cm_dev; 3667 struct cm_port *port; 3668 struct ib_mad_reg_req reg_req = { 3669 .mgmt_class = IB_MGMT_CLASS_CM, 3670 .mgmt_class_version = IB_CM_CLASS_VERSION 3671 }; 3672 struct ib_port_modify port_modify = { 3673 .set_port_cap_mask = IB_PORT_CM_SUP 3674 }; 3675 unsigned long flags; 3676 int ret; 3677 u8 i; 3678 3679 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3680 return; 3681 3682 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3683 ib_device->phys_port_cnt, GFP_KERNEL); 3684 if (!cm_dev) 3685 return; 3686 3687 cm_dev->ib_device = ib_device; 3688 cm_get_ack_delay(cm_dev); 3689 3690 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3691 MKDEV(0, 0), NULL, 3692 "%s", ib_device->name); 3693 if (IS_ERR(cm_dev->device)) { 3694 kfree(cm_dev); 3695 return; 3696 } 3697 3698 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3699 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3700 port = kzalloc(sizeof *port, GFP_KERNEL); 3701 if (!port) 3702 goto error1; 3703 3704 cm_dev->port[i-1] = port; 3705 port->cm_dev = cm_dev; 3706 port->port_num = i; 3707 3708 ret = cm_create_port_fs(port); 3709 if (ret) 3710 goto error1; 3711 3712 port->mad_agent = ib_register_mad_agent(ib_device, i, 3713 IB_QPT_GSI, 3714 ®_req, 3715 0, 3716 cm_send_handler, 3717 cm_recv_handler, 3718 port); 3719 if (IS_ERR(port->mad_agent)) 3720 goto error2; 3721 3722 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3723 if (ret) 3724 goto error3; 3725 } 3726 ib_set_client_data(ib_device, &cm_client, cm_dev); 3727 3728 write_lock_irqsave(&cm.device_lock, flags); 3729 list_add_tail(&cm_dev->list, &cm.device_list); 3730 write_unlock_irqrestore(&cm.device_lock, flags); 3731 return; 3732 3733error3: 3734 ib_unregister_mad_agent(port->mad_agent); 3735error2: 3736 cm_remove_port_fs(port); 3737error1: 3738 port_modify.set_port_cap_mask = 0; 3739 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3740 while (--i) { 3741 port = cm_dev->port[i-1]; 3742 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3743 ib_unregister_mad_agent(port->mad_agent); 3744 cm_remove_port_fs(port); 3745 } 3746 device_unregister(cm_dev->device); 3747 kfree(cm_dev); 3748} 3749 3750static void cm_remove_one(struct ib_device *ib_device) 3751{ 3752 struct cm_device *cm_dev; 3753 struct cm_port *port; 3754 struct ib_port_modify port_modify = { 3755 .clr_port_cap_mask = IB_PORT_CM_SUP 3756 }; 3757 unsigned long flags; 3758 int i; 3759 3760 cm_dev = ib_get_client_data(ib_device, &cm_client); 3761 if (!cm_dev) 3762 return; 3763 3764 write_lock_irqsave(&cm.device_lock, flags); 3765 list_del(&cm_dev->list); 3766 write_unlock_irqrestore(&cm.device_lock, flags); 3767 3768 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3769 port = cm_dev->port[i-1]; 3770 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3771 ib_unregister_mad_agent(port->mad_agent); 3772 flush_workqueue(cm.wq); 3773 cm_remove_port_fs(port); 3774 } 3775 device_unregister(cm_dev->device); 3776 kfree(cm_dev); 3777} 3778 3779static int __init ib_cm_init(void) 3780{ 3781 int ret; 3782 3783 memset(&cm, 0, sizeof cm); 3784 INIT_LIST_HEAD(&cm.device_list); 3785 rwlock_init(&cm.device_lock); 3786 spin_lock_init(&cm.lock); 3787 cm.listen_service_table = RB_ROOT; 3788 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3789 cm.remote_id_table = RB_ROOT; 3790 cm.remote_qp_table = RB_ROOT; 3791 cm.remote_sidr_table = RB_ROOT; 3792 idr_init(&cm.local_id_table); 3793 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3794 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3795 INIT_LIST_HEAD(&cm.timewait_list); 3796 3797 ret = class_register(&cm_class); 3798 if (ret) 3799 return -ENOMEM; 3800 3801 cm.wq = create_workqueue("ib_cm"); 3802 if (!cm.wq) { 3803 ret = -ENOMEM; 3804 goto error1; 3805 } 3806 3807 ret = ib_register_client(&cm_client); 3808 if (ret) 3809 goto error2; 3810 3811 return 0; 3812error2: 3813 destroy_workqueue(cm.wq); 3814error1: 3815 class_unregister(&cm_class); 3816 return ret; 3817} 3818 3819static void __exit ib_cm_cleanup(void) 3820{ 3821 struct cm_timewait_info *timewait_info, *tmp; 3822 3823 spin_lock_irq(&cm.lock); 3824 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3825 cancel_delayed_work(&timewait_info->work.work); 3826 spin_unlock_irq(&cm.lock); 3827 3828 ib_unregister_client(&cm_client); 3829 destroy_workqueue(cm.wq); 3830 3831 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3832 list_del(&timewait_info->list); 3833 kfree(timewait_info); 3834 } 3835 3836 class_unregister(&cm_class); 3837 idr_destroy(&cm.local_id_table); 3838} 3839 3840module_init(ib_cm_init); 3841module_exit(ib_cm_cleanup); 3842