cm.c revision 29963437a48475036353b95ab142bf199adb909e
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 /* Work-around until there's a way to obtain remote LID info */ 1032 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1033 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1034 } 1035 req_msg->primary_local_gid = pri_path->sgid; 1036 req_msg->primary_remote_gid = pri_path->dgid; 1037 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1038 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1039 req_msg->primary_traffic_class = pri_path->traffic_class; 1040 req_msg->primary_hop_limit = pri_path->hop_limit; 1041 cm_req_set_primary_sl(req_msg, pri_path->sl); 1042 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1043 cm_req_set_primary_local_ack_timeout(req_msg, 1044 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1045 pri_path->packet_life_time)); 1046 1047 if (alt_path) { 1048 if (alt_path->hop_limit <= 1) { 1049 req_msg->alt_local_lid = alt_path->slid; 1050 req_msg->alt_remote_lid = alt_path->dlid; 1051 } else { 1052 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1053 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1054 } 1055 req_msg->alt_local_gid = alt_path->sgid; 1056 req_msg->alt_remote_gid = alt_path->dgid; 1057 cm_req_set_alt_flow_label(req_msg, 1058 alt_path->flow_label); 1059 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1060 req_msg->alt_traffic_class = alt_path->traffic_class; 1061 req_msg->alt_hop_limit = alt_path->hop_limit; 1062 cm_req_set_alt_sl(req_msg, alt_path->sl); 1063 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1064 cm_req_set_alt_local_ack_timeout(req_msg, 1065 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1066 alt_path->packet_life_time)); 1067 } 1068 1069 if (param->private_data && param->private_data_len) 1070 memcpy(req_msg->private_data, param->private_data, 1071 param->private_data_len); 1072} 1073 1074static int cm_validate_req_param(struct ib_cm_req_param *param) 1075{ 1076 /* peer-to-peer not supported */ 1077 if (param->peer_to_peer) 1078 return -EINVAL; 1079 1080 if (!param->primary_path) 1081 return -EINVAL; 1082 1083 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1084 return -EINVAL; 1085 1086 if (param->private_data && 1087 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1088 return -EINVAL; 1089 1090 if (param->alternate_path && 1091 (param->alternate_path->pkey != param->primary_path->pkey || 1092 param->alternate_path->mtu != param->primary_path->mtu)) 1093 return -EINVAL; 1094 1095 return 0; 1096} 1097 1098int ib_send_cm_req(struct ib_cm_id *cm_id, 1099 struct ib_cm_req_param *param) 1100{ 1101 struct cm_id_private *cm_id_priv; 1102 struct cm_req_msg *req_msg; 1103 unsigned long flags; 1104 int ret; 1105 1106 ret = cm_validate_req_param(param); 1107 if (ret) 1108 return ret; 1109 1110 /* Verify that we're not in timewait. */ 1111 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1112 spin_lock_irqsave(&cm_id_priv->lock, flags); 1113 if (cm_id->state != IB_CM_IDLE) { 1114 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1115 ret = -EINVAL; 1116 goto out; 1117 } 1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1119 1120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1121 id.local_id); 1122 if (IS_ERR(cm_id_priv->timewait_info)) { 1123 ret = PTR_ERR(cm_id_priv->timewait_info); 1124 goto out; 1125 } 1126 1127 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1128 if (ret) 1129 goto error1; 1130 if (param->alternate_path) { 1131 ret = cm_init_av_by_path(param->alternate_path, 1132 &cm_id_priv->alt_av); 1133 if (ret) 1134 goto error1; 1135 } 1136 cm_id->service_id = param->service_id; 1137 cm_id->service_mask = ~cpu_to_be64(0); 1138 cm_id_priv->timeout_ms = cm_convert_to_ms( 1139 param->primary_path->packet_life_time) * 2 + 1140 cm_convert_to_ms( 1141 param->remote_cm_response_timeout); 1142 cm_id_priv->max_cm_retries = param->max_cm_retries; 1143 cm_id_priv->initiator_depth = param->initiator_depth; 1144 cm_id_priv->responder_resources = param->responder_resources; 1145 cm_id_priv->retry_count = param->retry_count; 1146 cm_id_priv->path_mtu = param->primary_path->mtu; 1147 cm_id_priv->pkey = param->primary_path->pkey; 1148 cm_id_priv->qp_type = param->qp_type; 1149 1150 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1151 if (ret) 1152 goto error1; 1153 1154 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1155 cm_format_req(req_msg, cm_id_priv, param); 1156 cm_id_priv->tid = req_msg->hdr.tid; 1157 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1158 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1159 1160 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1161 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1162 1163 spin_lock_irqsave(&cm_id_priv->lock, flags); 1164 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1165 if (ret) { 1166 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1167 goto error2; 1168 } 1169 BUG_ON(cm_id->state != IB_CM_IDLE); 1170 cm_id->state = IB_CM_REQ_SENT; 1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1172 return 0; 1173 1174error2: cm_free_msg(cm_id_priv->msg); 1175error1: kfree(cm_id_priv->timewait_info); 1176out: return ret; 1177} 1178EXPORT_SYMBOL(ib_send_cm_req); 1179 1180static int cm_issue_rej(struct cm_port *port, 1181 struct ib_mad_recv_wc *mad_recv_wc, 1182 enum ib_cm_rej_reason reason, 1183 enum cm_msg_response msg_rejected, 1184 void *ari, u8 ari_length) 1185{ 1186 struct ib_mad_send_buf *msg = NULL; 1187 struct cm_rej_msg *rej_msg, *rcv_msg; 1188 int ret; 1189 1190 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1191 if (ret) 1192 return ret; 1193 1194 /* We just need common CM header information. Cast to any message. */ 1195 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1196 rej_msg = (struct cm_rej_msg *) msg->mad; 1197 1198 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1199 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1200 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1201 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1202 rej_msg->reason = cpu_to_be16(reason); 1203 1204 if (ari && ari_length) { 1205 cm_rej_set_reject_info_len(rej_msg, ari_length); 1206 memcpy(rej_msg->ari, ari, ari_length); 1207 } 1208 1209 ret = ib_post_send_mad(msg, NULL); 1210 if (ret) 1211 cm_free_msg(msg); 1212 1213 return ret; 1214} 1215 1216static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1217 __be32 local_qpn, __be32 remote_qpn) 1218{ 1219 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1220 ((local_ca_guid == remote_ca_guid) && 1221 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1222} 1223 1224static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1225 struct ib_sa_path_rec *primary_path, 1226 struct ib_sa_path_rec *alt_path) 1227{ 1228 memset(primary_path, 0, sizeof *primary_path); 1229 primary_path->dgid = req_msg->primary_local_gid; 1230 primary_path->sgid = req_msg->primary_remote_gid; 1231 primary_path->dlid = req_msg->primary_local_lid; 1232 primary_path->slid = req_msg->primary_remote_lid; 1233 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1234 primary_path->hop_limit = req_msg->primary_hop_limit; 1235 primary_path->traffic_class = req_msg->primary_traffic_class; 1236 primary_path->reversible = 1; 1237 primary_path->pkey = req_msg->pkey; 1238 primary_path->sl = cm_req_get_primary_sl(req_msg); 1239 primary_path->mtu_selector = IB_SA_EQ; 1240 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1241 primary_path->rate_selector = IB_SA_EQ; 1242 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1243 primary_path->packet_life_time_selector = IB_SA_EQ; 1244 primary_path->packet_life_time = 1245 cm_req_get_primary_local_ack_timeout(req_msg); 1246 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1247 1248 if (req_msg->alt_local_lid) { 1249 memset(alt_path, 0, sizeof *alt_path); 1250 alt_path->dgid = req_msg->alt_local_gid; 1251 alt_path->sgid = req_msg->alt_remote_gid; 1252 alt_path->dlid = req_msg->alt_local_lid; 1253 alt_path->slid = req_msg->alt_remote_lid; 1254 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1255 alt_path->hop_limit = req_msg->alt_hop_limit; 1256 alt_path->traffic_class = req_msg->alt_traffic_class; 1257 alt_path->reversible = 1; 1258 alt_path->pkey = req_msg->pkey; 1259 alt_path->sl = cm_req_get_alt_sl(req_msg); 1260 alt_path->mtu_selector = IB_SA_EQ; 1261 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1262 alt_path->rate_selector = IB_SA_EQ; 1263 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1264 alt_path->packet_life_time_selector = IB_SA_EQ; 1265 alt_path->packet_life_time = 1266 cm_req_get_alt_local_ack_timeout(req_msg); 1267 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1268 } 1269} 1270 1271static void cm_format_req_event(struct cm_work *work, 1272 struct cm_id_private *cm_id_priv, 1273 struct ib_cm_id *listen_id) 1274{ 1275 struct cm_req_msg *req_msg; 1276 struct ib_cm_req_event_param *param; 1277 1278 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1279 param = &work->cm_event.param.req_rcvd; 1280 param->listen_id = listen_id; 1281 param->port = cm_id_priv->av.port->port_num; 1282 param->primary_path = &work->path[0]; 1283 if (req_msg->alt_local_lid) 1284 param->alternate_path = &work->path[1]; 1285 else 1286 param->alternate_path = NULL; 1287 param->remote_ca_guid = req_msg->local_ca_guid; 1288 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1289 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1290 param->qp_type = cm_req_get_qp_type(req_msg); 1291 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1292 param->responder_resources = cm_req_get_init_depth(req_msg); 1293 param->initiator_depth = cm_req_get_resp_res(req_msg); 1294 param->local_cm_response_timeout = 1295 cm_req_get_remote_resp_timeout(req_msg); 1296 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1297 param->remote_cm_response_timeout = 1298 cm_req_get_local_resp_timeout(req_msg); 1299 param->retry_count = cm_req_get_retry_count(req_msg); 1300 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1301 param->srq = cm_req_get_srq(req_msg); 1302 work->cm_event.private_data = &req_msg->private_data; 1303} 1304 1305static void cm_process_work(struct cm_id_private *cm_id_priv, 1306 struct cm_work *work) 1307{ 1308 int ret; 1309 1310 /* We will typically only have the current event to report. */ 1311 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1312 cm_free_work(work); 1313 1314 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1315 spin_lock_irq(&cm_id_priv->lock); 1316 work = cm_dequeue_work(cm_id_priv); 1317 spin_unlock_irq(&cm_id_priv->lock); 1318 BUG_ON(!work); 1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1320 &work->cm_event); 1321 cm_free_work(work); 1322 } 1323 cm_deref_id(cm_id_priv); 1324 if (ret) 1325 cm_destroy_id(&cm_id_priv->id, ret); 1326} 1327 1328static void cm_format_mra(struct cm_mra_msg *mra_msg, 1329 struct cm_id_private *cm_id_priv, 1330 enum cm_msg_response msg_mraed, u8 service_timeout, 1331 const void *private_data, u8 private_data_len) 1332{ 1333 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1334 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1335 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1336 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1337 cm_mra_set_service_timeout(mra_msg, service_timeout); 1338 1339 if (private_data && private_data_len) 1340 memcpy(mra_msg->private_data, private_data, private_data_len); 1341} 1342 1343static void cm_format_rej(struct cm_rej_msg *rej_msg, 1344 struct cm_id_private *cm_id_priv, 1345 enum ib_cm_rej_reason reason, 1346 void *ari, 1347 u8 ari_length, 1348 const void *private_data, 1349 u8 private_data_len) 1350{ 1351 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1352 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1353 1354 switch(cm_id_priv->id.state) { 1355 case IB_CM_REQ_RCVD: 1356 rej_msg->local_comm_id = 0; 1357 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1358 break; 1359 case IB_CM_MRA_REQ_SENT: 1360 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1362 break; 1363 case IB_CM_REP_RCVD: 1364 case IB_CM_MRA_REP_SENT: 1365 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1367 break; 1368 default: 1369 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1371 break; 1372 } 1373 1374 rej_msg->reason = cpu_to_be16(reason); 1375 if (ari && ari_length) { 1376 cm_rej_set_reject_info_len(rej_msg, ari_length); 1377 memcpy(rej_msg->ari, ari, ari_length); 1378 } 1379 1380 if (private_data && private_data_len) 1381 memcpy(rej_msg->private_data, private_data, private_data_len); 1382} 1383 1384static void cm_dup_req_handler(struct cm_work *work, 1385 struct cm_id_private *cm_id_priv) 1386{ 1387 struct ib_mad_send_buf *msg = NULL; 1388 int ret; 1389 1390 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1391 counter[CM_REQ_COUNTER]); 1392 1393 /* Quick state check to discard duplicate REQs. */ 1394 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1395 return; 1396 1397 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1398 if (ret) 1399 return; 1400 1401 spin_lock_irq(&cm_id_priv->lock); 1402 switch (cm_id_priv->id.state) { 1403 case IB_CM_MRA_REQ_SENT: 1404 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1405 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1406 cm_id_priv->private_data, 1407 cm_id_priv->private_data_len); 1408 break; 1409 case IB_CM_TIMEWAIT: 1410 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1411 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1412 break; 1413 default: 1414 goto unlock; 1415 } 1416 spin_unlock_irq(&cm_id_priv->lock); 1417 1418 ret = ib_post_send_mad(msg, NULL); 1419 if (ret) 1420 goto free; 1421 return; 1422 1423unlock: spin_unlock_irq(&cm_id_priv->lock); 1424free: cm_free_msg(msg); 1425} 1426 1427static struct cm_id_private * cm_match_req(struct cm_work *work, 1428 struct cm_id_private *cm_id_priv) 1429{ 1430 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1431 struct cm_timewait_info *timewait_info; 1432 struct cm_req_msg *req_msg; 1433 1434 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1435 1436 /* Check for possible duplicate REQ. */ 1437 spin_lock_irq(&cm.lock); 1438 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1439 if (timewait_info) { 1440 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1441 timewait_info->work.remote_id); 1442 spin_unlock_irq(&cm.lock); 1443 if (cur_cm_id_priv) { 1444 cm_dup_req_handler(work, cur_cm_id_priv); 1445 cm_deref_id(cur_cm_id_priv); 1446 } 1447 return NULL; 1448 } 1449 1450 /* Check for stale connections. */ 1451 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1452 if (timewait_info) { 1453 cm_cleanup_timewait(cm_id_priv->timewait_info); 1454 spin_unlock_irq(&cm.lock); 1455 cm_issue_rej(work->port, work->mad_recv_wc, 1456 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1457 NULL, 0); 1458 return NULL; 1459 } 1460 1461 /* Find matching listen request. */ 1462 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1463 req_msg->service_id, 1464 req_msg->private_data); 1465 if (!listen_cm_id_priv) { 1466 cm_cleanup_timewait(cm_id_priv->timewait_info); 1467 spin_unlock_irq(&cm.lock); 1468 cm_issue_rej(work->port, work->mad_recv_wc, 1469 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1470 NULL, 0); 1471 goto out; 1472 } 1473 atomic_inc(&listen_cm_id_priv->refcount); 1474 atomic_inc(&cm_id_priv->refcount); 1475 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1476 atomic_inc(&cm_id_priv->work_count); 1477 spin_unlock_irq(&cm.lock); 1478out: 1479 return listen_cm_id_priv; 1480} 1481 1482/* 1483 * Work-around for inter-subnet connections. If the LIDs are permissive, 1484 * we need to override the LID/SL data in the REQ with the LID information 1485 * in the work completion. 1486 */ 1487static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1488{ 1489 if (!cm_req_get_primary_subnet_local(req_msg)) { 1490 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1491 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1492 cm_req_set_primary_sl(req_msg, wc->sl); 1493 } 1494 1495 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1496 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1497 } 1498 1499 if (!cm_req_get_alt_subnet_local(req_msg)) { 1500 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1501 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1502 cm_req_set_alt_sl(req_msg, wc->sl); 1503 } 1504 1505 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1506 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1507 } 1508} 1509 1510static int cm_req_handler(struct cm_work *work) 1511{ 1512 struct ib_cm_id *cm_id; 1513 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1514 struct cm_req_msg *req_msg; 1515 int ret; 1516 1517 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1518 1519 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1520 if (IS_ERR(cm_id)) 1521 return PTR_ERR(cm_id); 1522 1523 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1524 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1525 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1526 work->mad_recv_wc->recv_buf.grh, 1527 &cm_id_priv->av); 1528 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1529 id.local_id); 1530 if (IS_ERR(cm_id_priv->timewait_info)) { 1531 ret = PTR_ERR(cm_id_priv->timewait_info); 1532 goto destroy; 1533 } 1534 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1535 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1536 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1537 1538 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1539 if (!listen_cm_id_priv) { 1540 ret = -EINVAL; 1541 kfree(cm_id_priv->timewait_info); 1542 goto destroy; 1543 } 1544 1545 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1546 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1547 cm_id_priv->id.service_id = req_msg->service_id; 1548 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1549 1550 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1551 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1552 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1553 if (ret) { 1554 ib_get_cached_gid(work->port->cm_dev->ib_device, 1555 work->port->port_num, 0, &work->path[0].sgid); 1556 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1557 &work->path[0].sgid, sizeof work->path[0].sgid, 1558 NULL, 0); 1559 goto rejected; 1560 } 1561 if (req_msg->alt_local_lid) { 1562 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1563 if (ret) { 1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1565 &work->path[0].sgid, 1566 sizeof work->path[0].sgid, NULL, 0); 1567 goto rejected; 1568 } 1569 } 1570 cm_id_priv->tid = req_msg->hdr.tid; 1571 cm_id_priv->timeout_ms = cm_convert_to_ms( 1572 cm_req_get_local_resp_timeout(req_msg)); 1573 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1574 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1575 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1576 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1577 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1578 cm_id_priv->pkey = req_msg->pkey; 1579 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1580 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1581 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1582 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1583 1584 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1585 cm_process_work(cm_id_priv, work); 1586 cm_deref_id(listen_cm_id_priv); 1587 return 0; 1588 1589rejected: 1590 atomic_dec(&cm_id_priv->refcount); 1591 cm_deref_id(listen_cm_id_priv); 1592destroy: 1593 ib_destroy_cm_id(cm_id); 1594 return ret; 1595} 1596 1597static void cm_format_rep(struct cm_rep_msg *rep_msg, 1598 struct cm_id_private *cm_id_priv, 1599 struct ib_cm_rep_param *param) 1600{ 1601 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1602 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1603 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1604 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1605 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1606 rep_msg->resp_resources = param->responder_resources; 1607 rep_msg->initiator_depth = param->initiator_depth; 1608 cm_rep_set_target_ack_delay(rep_msg, 1609 cm_id_priv->av.port->cm_dev->ack_delay); 1610 cm_rep_set_failover(rep_msg, param->failover_accepted); 1611 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1612 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1613 cm_rep_set_srq(rep_msg, param->srq); 1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1615 1616 if (param->private_data && param->private_data_len) 1617 memcpy(rep_msg->private_data, param->private_data, 1618 param->private_data_len); 1619} 1620 1621int ib_send_cm_rep(struct ib_cm_id *cm_id, 1622 struct ib_cm_rep_param *param) 1623{ 1624 struct cm_id_private *cm_id_priv; 1625 struct ib_mad_send_buf *msg; 1626 struct cm_rep_msg *rep_msg; 1627 unsigned long flags; 1628 int ret; 1629 1630 if (param->private_data && 1631 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1632 return -EINVAL; 1633 1634 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1635 spin_lock_irqsave(&cm_id_priv->lock, flags); 1636 if (cm_id->state != IB_CM_REQ_RCVD && 1637 cm_id->state != IB_CM_MRA_REQ_SENT) { 1638 ret = -EINVAL; 1639 goto out; 1640 } 1641 1642 ret = cm_alloc_msg(cm_id_priv, &msg); 1643 if (ret) 1644 goto out; 1645 1646 rep_msg = (struct cm_rep_msg *) msg->mad; 1647 cm_format_rep(rep_msg, cm_id_priv, param); 1648 msg->timeout_ms = cm_id_priv->timeout_ms; 1649 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1650 1651 ret = ib_post_send_mad(msg, NULL); 1652 if (ret) { 1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1654 cm_free_msg(msg); 1655 return ret; 1656 } 1657 1658 cm_id->state = IB_CM_REP_SENT; 1659 cm_id_priv->msg = msg; 1660 cm_id_priv->initiator_depth = param->initiator_depth; 1661 cm_id_priv->responder_resources = param->responder_resources; 1662 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1663 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1664 1665out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1666 return ret; 1667} 1668EXPORT_SYMBOL(ib_send_cm_rep); 1669 1670static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1671 struct cm_id_private *cm_id_priv, 1672 const void *private_data, 1673 u8 private_data_len) 1674{ 1675 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1676 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1677 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1678 1679 if (private_data && private_data_len) 1680 memcpy(rtu_msg->private_data, private_data, private_data_len); 1681} 1682 1683int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1684 const void *private_data, 1685 u8 private_data_len) 1686{ 1687 struct cm_id_private *cm_id_priv; 1688 struct ib_mad_send_buf *msg; 1689 unsigned long flags; 1690 void *data; 1691 int ret; 1692 1693 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1694 return -EINVAL; 1695 1696 data = cm_copy_private_data(private_data, private_data_len); 1697 if (IS_ERR(data)) 1698 return PTR_ERR(data); 1699 1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1701 spin_lock_irqsave(&cm_id_priv->lock, flags); 1702 if (cm_id->state != IB_CM_REP_RCVD && 1703 cm_id->state != IB_CM_MRA_REP_SENT) { 1704 ret = -EINVAL; 1705 goto error; 1706 } 1707 1708 ret = cm_alloc_msg(cm_id_priv, &msg); 1709 if (ret) 1710 goto error; 1711 1712 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1713 private_data, private_data_len); 1714 1715 ret = ib_post_send_mad(msg, NULL); 1716 if (ret) { 1717 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1718 cm_free_msg(msg); 1719 kfree(data); 1720 return ret; 1721 } 1722 1723 cm_id->state = IB_CM_ESTABLISHED; 1724 cm_set_private_data(cm_id_priv, data, private_data_len); 1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1726 return 0; 1727 1728error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1729 kfree(data); 1730 return ret; 1731} 1732EXPORT_SYMBOL(ib_send_cm_rtu); 1733 1734static void cm_format_rep_event(struct cm_work *work) 1735{ 1736 struct cm_rep_msg *rep_msg; 1737 struct ib_cm_rep_event_param *param; 1738 1739 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1740 param = &work->cm_event.param.rep_rcvd; 1741 param->remote_ca_guid = rep_msg->local_ca_guid; 1742 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1743 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1744 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1745 param->responder_resources = rep_msg->initiator_depth; 1746 param->initiator_depth = rep_msg->resp_resources; 1747 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1748 param->failover_accepted = cm_rep_get_failover(rep_msg); 1749 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1750 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1751 param->srq = cm_rep_get_srq(rep_msg); 1752 work->cm_event.private_data = &rep_msg->private_data; 1753} 1754 1755static void cm_dup_rep_handler(struct cm_work *work) 1756{ 1757 struct cm_id_private *cm_id_priv; 1758 struct cm_rep_msg *rep_msg; 1759 struct ib_mad_send_buf *msg = NULL; 1760 int ret; 1761 1762 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1763 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1764 rep_msg->local_comm_id); 1765 if (!cm_id_priv) 1766 return; 1767 1768 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1769 counter[CM_REP_COUNTER]); 1770 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1771 if (ret) 1772 goto deref; 1773 1774 spin_lock_irq(&cm_id_priv->lock); 1775 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1776 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1777 cm_id_priv->private_data, 1778 cm_id_priv->private_data_len); 1779 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1780 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1781 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1782 cm_id_priv->private_data, 1783 cm_id_priv->private_data_len); 1784 else 1785 goto unlock; 1786 spin_unlock_irq(&cm_id_priv->lock); 1787 1788 ret = ib_post_send_mad(msg, NULL); 1789 if (ret) 1790 goto free; 1791 goto deref; 1792 1793unlock: spin_unlock_irq(&cm_id_priv->lock); 1794free: cm_free_msg(msg); 1795deref: cm_deref_id(cm_id_priv); 1796} 1797 1798static int cm_rep_handler(struct cm_work *work) 1799{ 1800 struct cm_id_private *cm_id_priv; 1801 struct cm_rep_msg *rep_msg; 1802 int ret; 1803 1804 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1805 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1806 if (!cm_id_priv) { 1807 cm_dup_rep_handler(work); 1808 return -EINVAL; 1809 } 1810 1811 cm_format_rep_event(work); 1812 1813 spin_lock_irq(&cm_id_priv->lock); 1814 switch (cm_id_priv->id.state) { 1815 case IB_CM_REQ_SENT: 1816 case IB_CM_MRA_REQ_RCVD: 1817 break; 1818 default: 1819 spin_unlock_irq(&cm_id_priv->lock); 1820 ret = -EINVAL; 1821 goto error; 1822 } 1823 1824 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1825 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1826 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1827 1828 spin_lock(&cm.lock); 1829 /* Check for duplicate REP. */ 1830 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1831 spin_unlock(&cm.lock); 1832 spin_unlock_irq(&cm_id_priv->lock); 1833 ret = -EINVAL; 1834 goto error; 1835 } 1836 /* Check for a stale connection. */ 1837 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1838 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1839 &cm.remote_id_table); 1840 cm_id_priv->timewait_info->inserted_remote_id = 0; 1841 spin_unlock(&cm.lock); 1842 spin_unlock_irq(&cm_id_priv->lock); 1843 cm_issue_rej(work->port, work->mad_recv_wc, 1844 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1845 NULL, 0); 1846 ret = -EINVAL; 1847 goto error; 1848 } 1849 spin_unlock(&cm.lock); 1850 1851 cm_id_priv->id.state = IB_CM_REP_RCVD; 1852 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1853 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1854 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1855 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1856 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1857 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1858 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1859 cm_id_priv->av.timeout = 1860 cm_ack_timeout(cm_id_priv->target_ack_delay, 1861 cm_id_priv->av.timeout - 1); 1862 cm_id_priv->alt_av.timeout = 1863 cm_ack_timeout(cm_id_priv->target_ack_delay, 1864 cm_id_priv->alt_av.timeout - 1); 1865 1866 /* todo: handle peer_to_peer */ 1867 1868 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1869 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1870 if (!ret) 1871 list_add_tail(&work->list, &cm_id_priv->work_list); 1872 spin_unlock_irq(&cm_id_priv->lock); 1873 1874 if (ret) 1875 cm_process_work(cm_id_priv, work); 1876 else 1877 cm_deref_id(cm_id_priv); 1878 return 0; 1879 1880error: 1881 cm_deref_id(cm_id_priv); 1882 return ret; 1883} 1884 1885static int cm_establish_handler(struct cm_work *work) 1886{ 1887 struct cm_id_private *cm_id_priv; 1888 int ret; 1889 1890 /* See comment in cm_establish about lookup. */ 1891 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1892 if (!cm_id_priv) 1893 return -EINVAL; 1894 1895 spin_lock_irq(&cm_id_priv->lock); 1896 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1897 spin_unlock_irq(&cm_id_priv->lock); 1898 goto out; 1899 } 1900 1901 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1902 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1903 if (!ret) 1904 list_add_tail(&work->list, &cm_id_priv->work_list); 1905 spin_unlock_irq(&cm_id_priv->lock); 1906 1907 if (ret) 1908 cm_process_work(cm_id_priv, work); 1909 else 1910 cm_deref_id(cm_id_priv); 1911 return 0; 1912out: 1913 cm_deref_id(cm_id_priv); 1914 return -EINVAL; 1915} 1916 1917static int cm_rtu_handler(struct cm_work *work) 1918{ 1919 struct cm_id_private *cm_id_priv; 1920 struct cm_rtu_msg *rtu_msg; 1921 int ret; 1922 1923 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1924 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1925 rtu_msg->local_comm_id); 1926 if (!cm_id_priv) 1927 return -EINVAL; 1928 1929 work->cm_event.private_data = &rtu_msg->private_data; 1930 1931 spin_lock_irq(&cm_id_priv->lock); 1932 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1933 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1936 counter[CM_RTU_COUNTER]); 1937 goto out; 1938 } 1939 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1940 1941 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1942 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1943 if (!ret) 1944 list_add_tail(&work->list, &cm_id_priv->work_list); 1945 spin_unlock_irq(&cm_id_priv->lock); 1946 1947 if (ret) 1948 cm_process_work(cm_id_priv, work); 1949 else 1950 cm_deref_id(cm_id_priv); 1951 return 0; 1952out: 1953 cm_deref_id(cm_id_priv); 1954 return -EINVAL; 1955} 1956 1957static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1958 struct cm_id_private *cm_id_priv, 1959 const void *private_data, 1960 u8 private_data_len) 1961{ 1962 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1963 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1964 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1965 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1966 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1967 1968 if (private_data && private_data_len) 1969 memcpy(dreq_msg->private_data, private_data, private_data_len); 1970} 1971 1972int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1973 const void *private_data, 1974 u8 private_data_len) 1975{ 1976 struct cm_id_private *cm_id_priv; 1977 struct ib_mad_send_buf *msg; 1978 unsigned long flags; 1979 int ret; 1980 1981 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1982 return -EINVAL; 1983 1984 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1985 spin_lock_irqsave(&cm_id_priv->lock, flags); 1986 if (cm_id->state != IB_CM_ESTABLISHED) { 1987 ret = -EINVAL; 1988 goto out; 1989 } 1990 1991 ret = cm_alloc_msg(cm_id_priv, &msg); 1992 if (ret) { 1993 cm_enter_timewait(cm_id_priv); 1994 goto out; 1995 } 1996 1997 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1998 private_data, private_data_len); 1999 msg->timeout_ms = cm_id_priv->timeout_ms; 2000 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2001 2002 ret = ib_post_send_mad(msg, NULL); 2003 if (ret) { 2004 cm_enter_timewait(cm_id_priv); 2005 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2006 cm_free_msg(msg); 2007 return ret; 2008 } 2009 2010 cm_id->state = IB_CM_DREQ_SENT; 2011 cm_id_priv->msg = msg; 2012out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2013 return ret; 2014} 2015EXPORT_SYMBOL(ib_send_cm_dreq); 2016 2017static void cm_format_drep(struct cm_drep_msg *drep_msg, 2018 struct cm_id_private *cm_id_priv, 2019 const void *private_data, 2020 u8 private_data_len) 2021{ 2022 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2023 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2024 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2025 2026 if (private_data && private_data_len) 2027 memcpy(drep_msg->private_data, private_data, private_data_len); 2028} 2029 2030int ib_send_cm_drep(struct ib_cm_id *cm_id, 2031 const void *private_data, 2032 u8 private_data_len) 2033{ 2034 struct cm_id_private *cm_id_priv; 2035 struct ib_mad_send_buf *msg; 2036 unsigned long flags; 2037 void *data; 2038 int ret; 2039 2040 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2041 return -EINVAL; 2042 2043 data = cm_copy_private_data(private_data, private_data_len); 2044 if (IS_ERR(data)) 2045 return PTR_ERR(data); 2046 2047 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2048 spin_lock_irqsave(&cm_id_priv->lock, flags); 2049 if (cm_id->state != IB_CM_DREQ_RCVD) { 2050 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2051 kfree(data); 2052 return -EINVAL; 2053 } 2054 2055 cm_set_private_data(cm_id_priv, data, private_data_len); 2056 cm_enter_timewait(cm_id_priv); 2057 2058 ret = cm_alloc_msg(cm_id_priv, &msg); 2059 if (ret) 2060 goto out; 2061 2062 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2063 private_data, private_data_len); 2064 2065 ret = ib_post_send_mad(msg, NULL); 2066 if (ret) { 2067 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2068 cm_free_msg(msg); 2069 return ret; 2070 } 2071 2072out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2073 return ret; 2074} 2075EXPORT_SYMBOL(ib_send_cm_drep); 2076 2077static int cm_issue_drep(struct cm_port *port, 2078 struct ib_mad_recv_wc *mad_recv_wc) 2079{ 2080 struct ib_mad_send_buf *msg = NULL; 2081 struct cm_dreq_msg *dreq_msg; 2082 struct cm_drep_msg *drep_msg; 2083 int ret; 2084 2085 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2086 if (ret) 2087 return ret; 2088 2089 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2090 drep_msg = (struct cm_drep_msg *) msg->mad; 2091 2092 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2093 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2094 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2095 2096 ret = ib_post_send_mad(msg, NULL); 2097 if (ret) 2098 cm_free_msg(msg); 2099 2100 return ret; 2101} 2102 2103static int cm_dreq_handler(struct cm_work *work) 2104{ 2105 struct cm_id_private *cm_id_priv; 2106 struct cm_dreq_msg *dreq_msg; 2107 struct ib_mad_send_buf *msg = NULL; 2108 int ret; 2109 2110 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2111 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2112 dreq_msg->local_comm_id); 2113 if (!cm_id_priv) { 2114 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2115 counter[CM_DREQ_COUNTER]); 2116 cm_issue_drep(work->port, work->mad_recv_wc); 2117 return -EINVAL; 2118 } 2119 2120 work->cm_event.private_data = &dreq_msg->private_data; 2121 2122 spin_lock_irq(&cm_id_priv->lock); 2123 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2124 goto unlock; 2125 2126 switch (cm_id_priv->id.state) { 2127 case IB_CM_REP_SENT: 2128 case IB_CM_DREQ_SENT: 2129 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2130 break; 2131 case IB_CM_ESTABLISHED: 2132 case IB_CM_MRA_REP_RCVD: 2133 break; 2134 case IB_CM_TIMEWAIT: 2135 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2136 counter[CM_DREQ_COUNTER]); 2137 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2138 goto unlock; 2139 2140 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2141 cm_id_priv->private_data, 2142 cm_id_priv->private_data_len); 2143 spin_unlock_irq(&cm_id_priv->lock); 2144 2145 if (ib_post_send_mad(msg, NULL)) 2146 cm_free_msg(msg); 2147 goto deref; 2148 case IB_CM_DREQ_RCVD: 2149 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2150 counter[CM_DREQ_COUNTER]); 2151 goto unlock; 2152 default: 2153 goto unlock; 2154 } 2155 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2156 cm_id_priv->tid = dreq_msg->hdr.tid; 2157 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2158 if (!ret) 2159 list_add_tail(&work->list, &cm_id_priv->work_list); 2160 spin_unlock_irq(&cm_id_priv->lock); 2161 2162 if (ret) 2163 cm_process_work(cm_id_priv, work); 2164 else 2165 cm_deref_id(cm_id_priv); 2166 return 0; 2167 2168unlock: spin_unlock_irq(&cm_id_priv->lock); 2169deref: cm_deref_id(cm_id_priv); 2170 return -EINVAL; 2171} 2172 2173static int cm_drep_handler(struct cm_work *work) 2174{ 2175 struct cm_id_private *cm_id_priv; 2176 struct cm_drep_msg *drep_msg; 2177 int ret; 2178 2179 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2180 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2181 drep_msg->local_comm_id); 2182 if (!cm_id_priv) 2183 return -EINVAL; 2184 2185 work->cm_event.private_data = &drep_msg->private_data; 2186 2187 spin_lock_irq(&cm_id_priv->lock); 2188 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2189 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2190 spin_unlock_irq(&cm_id_priv->lock); 2191 goto out; 2192 } 2193 cm_enter_timewait(cm_id_priv); 2194 2195 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2196 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2197 if (!ret) 2198 list_add_tail(&work->list, &cm_id_priv->work_list); 2199 spin_unlock_irq(&cm_id_priv->lock); 2200 2201 if (ret) 2202 cm_process_work(cm_id_priv, work); 2203 else 2204 cm_deref_id(cm_id_priv); 2205 return 0; 2206out: 2207 cm_deref_id(cm_id_priv); 2208 return -EINVAL; 2209} 2210 2211int ib_send_cm_rej(struct ib_cm_id *cm_id, 2212 enum ib_cm_rej_reason reason, 2213 void *ari, 2214 u8 ari_length, 2215 const void *private_data, 2216 u8 private_data_len) 2217{ 2218 struct cm_id_private *cm_id_priv; 2219 struct ib_mad_send_buf *msg; 2220 unsigned long flags; 2221 int ret; 2222 2223 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2224 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2225 return -EINVAL; 2226 2227 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2228 2229 spin_lock_irqsave(&cm_id_priv->lock, flags); 2230 switch (cm_id->state) { 2231 case IB_CM_REQ_SENT: 2232 case IB_CM_MRA_REQ_RCVD: 2233 case IB_CM_REQ_RCVD: 2234 case IB_CM_MRA_REQ_SENT: 2235 case IB_CM_REP_RCVD: 2236 case IB_CM_MRA_REP_SENT: 2237 ret = cm_alloc_msg(cm_id_priv, &msg); 2238 if (!ret) 2239 cm_format_rej((struct cm_rej_msg *) msg->mad, 2240 cm_id_priv, reason, ari, ari_length, 2241 private_data, private_data_len); 2242 2243 cm_reset_to_idle(cm_id_priv); 2244 break; 2245 case IB_CM_REP_SENT: 2246 case IB_CM_MRA_REP_RCVD: 2247 ret = cm_alloc_msg(cm_id_priv, &msg); 2248 if (!ret) 2249 cm_format_rej((struct cm_rej_msg *) msg->mad, 2250 cm_id_priv, reason, ari, ari_length, 2251 private_data, private_data_len); 2252 2253 cm_enter_timewait(cm_id_priv); 2254 break; 2255 default: 2256 ret = -EINVAL; 2257 goto out; 2258 } 2259 2260 if (ret) 2261 goto out; 2262 2263 ret = ib_post_send_mad(msg, NULL); 2264 if (ret) 2265 cm_free_msg(msg); 2266 2267out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2268 return ret; 2269} 2270EXPORT_SYMBOL(ib_send_cm_rej); 2271 2272static void cm_format_rej_event(struct cm_work *work) 2273{ 2274 struct cm_rej_msg *rej_msg; 2275 struct ib_cm_rej_event_param *param; 2276 2277 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2278 param = &work->cm_event.param.rej_rcvd; 2279 param->ari = rej_msg->ari; 2280 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2281 param->reason = __be16_to_cpu(rej_msg->reason); 2282 work->cm_event.private_data = &rej_msg->private_data; 2283} 2284 2285static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2286{ 2287 struct cm_timewait_info *timewait_info; 2288 struct cm_id_private *cm_id_priv; 2289 __be32 remote_id; 2290 2291 remote_id = rej_msg->local_comm_id; 2292 2293 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2294 spin_lock_irq(&cm.lock); 2295 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2296 remote_id); 2297 if (!timewait_info) { 2298 spin_unlock_irq(&cm.lock); 2299 return NULL; 2300 } 2301 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2302 (timewait_info->work.local_id ^ 2303 cm.random_id_operand)); 2304 if (cm_id_priv) { 2305 if (cm_id_priv->id.remote_id == remote_id) 2306 atomic_inc(&cm_id_priv->refcount); 2307 else 2308 cm_id_priv = NULL; 2309 } 2310 spin_unlock_irq(&cm.lock); 2311 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2312 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2313 else 2314 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2315 2316 return cm_id_priv; 2317} 2318 2319static int cm_rej_handler(struct cm_work *work) 2320{ 2321 struct cm_id_private *cm_id_priv; 2322 struct cm_rej_msg *rej_msg; 2323 int ret; 2324 2325 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2326 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2327 if (!cm_id_priv) 2328 return -EINVAL; 2329 2330 cm_format_rej_event(work); 2331 2332 spin_lock_irq(&cm_id_priv->lock); 2333 switch (cm_id_priv->id.state) { 2334 case IB_CM_REQ_SENT: 2335 case IB_CM_MRA_REQ_RCVD: 2336 case IB_CM_REP_SENT: 2337 case IB_CM_MRA_REP_RCVD: 2338 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2339 /* fall through */ 2340 case IB_CM_REQ_RCVD: 2341 case IB_CM_MRA_REQ_SENT: 2342 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2343 cm_enter_timewait(cm_id_priv); 2344 else 2345 cm_reset_to_idle(cm_id_priv); 2346 break; 2347 case IB_CM_DREQ_SENT: 2348 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2349 /* fall through */ 2350 case IB_CM_REP_RCVD: 2351 case IB_CM_MRA_REP_SENT: 2352 case IB_CM_ESTABLISHED: 2353 cm_enter_timewait(cm_id_priv); 2354 break; 2355 default: 2356 spin_unlock_irq(&cm_id_priv->lock); 2357 ret = -EINVAL; 2358 goto out; 2359 } 2360 2361 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2362 if (!ret) 2363 list_add_tail(&work->list, &cm_id_priv->work_list); 2364 spin_unlock_irq(&cm_id_priv->lock); 2365 2366 if (ret) 2367 cm_process_work(cm_id_priv, work); 2368 else 2369 cm_deref_id(cm_id_priv); 2370 return 0; 2371out: 2372 cm_deref_id(cm_id_priv); 2373 return -EINVAL; 2374} 2375 2376int ib_send_cm_mra(struct ib_cm_id *cm_id, 2377 u8 service_timeout, 2378 const void *private_data, 2379 u8 private_data_len) 2380{ 2381 struct cm_id_private *cm_id_priv; 2382 struct ib_mad_send_buf *msg; 2383 enum ib_cm_state cm_state; 2384 enum ib_cm_lap_state lap_state; 2385 enum cm_msg_response msg_response; 2386 void *data; 2387 unsigned long flags; 2388 int ret; 2389 2390 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2391 return -EINVAL; 2392 2393 data = cm_copy_private_data(private_data, private_data_len); 2394 if (IS_ERR(data)) 2395 return PTR_ERR(data); 2396 2397 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2398 2399 spin_lock_irqsave(&cm_id_priv->lock, flags); 2400 switch(cm_id_priv->id.state) { 2401 case IB_CM_REQ_RCVD: 2402 cm_state = IB_CM_MRA_REQ_SENT; 2403 lap_state = cm_id->lap_state; 2404 msg_response = CM_MSG_RESPONSE_REQ; 2405 break; 2406 case IB_CM_REP_RCVD: 2407 cm_state = IB_CM_MRA_REP_SENT; 2408 lap_state = cm_id->lap_state; 2409 msg_response = CM_MSG_RESPONSE_REP; 2410 break; 2411 case IB_CM_ESTABLISHED: 2412 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2413 cm_state = cm_id->state; 2414 lap_state = IB_CM_MRA_LAP_SENT; 2415 msg_response = CM_MSG_RESPONSE_OTHER; 2416 break; 2417 } 2418 default: 2419 ret = -EINVAL; 2420 goto error1; 2421 } 2422 2423 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2424 ret = cm_alloc_msg(cm_id_priv, &msg); 2425 if (ret) 2426 goto error1; 2427 2428 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2429 msg_response, service_timeout, 2430 private_data, private_data_len); 2431 ret = ib_post_send_mad(msg, NULL); 2432 if (ret) 2433 goto error2; 2434 } 2435 2436 cm_id->state = cm_state; 2437 cm_id->lap_state = lap_state; 2438 cm_id_priv->service_timeout = service_timeout; 2439 cm_set_private_data(cm_id_priv, data, private_data_len); 2440 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2441 return 0; 2442 2443error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2444 kfree(data); 2445 return ret; 2446 2447error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2448 kfree(data); 2449 cm_free_msg(msg); 2450 return ret; 2451} 2452EXPORT_SYMBOL(ib_send_cm_mra); 2453 2454static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2455{ 2456 switch (cm_mra_get_msg_mraed(mra_msg)) { 2457 case CM_MSG_RESPONSE_REQ: 2458 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2459 case CM_MSG_RESPONSE_REP: 2460 case CM_MSG_RESPONSE_OTHER: 2461 return cm_acquire_id(mra_msg->remote_comm_id, 2462 mra_msg->local_comm_id); 2463 default: 2464 return NULL; 2465 } 2466} 2467 2468static int cm_mra_handler(struct cm_work *work) 2469{ 2470 struct cm_id_private *cm_id_priv; 2471 struct cm_mra_msg *mra_msg; 2472 int timeout, ret; 2473 2474 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2475 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2476 if (!cm_id_priv) 2477 return -EINVAL; 2478 2479 work->cm_event.private_data = &mra_msg->private_data; 2480 work->cm_event.param.mra_rcvd.service_timeout = 2481 cm_mra_get_service_timeout(mra_msg); 2482 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2483 cm_convert_to_ms(cm_id_priv->av.timeout); 2484 2485 spin_lock_irq(&cm_id_priv->lock); 2486 switch (cm_id_priv->id.state) { 2487 case IB_CM_REQ_SENT: 2488 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2489 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2490 cm_id_priv->msg, timeout)) 2491 goto out; 2492 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2493 break; 2494 case IB_CM_REP_SENT: 2495 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2496 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2497 cm_id_priv->msg, timeout)) 2498 goto out; 2499 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2500 break; 2501 case IB_CM_ESTABLISHED: 2502 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2503 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2504 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2505 cm_id_priv->msg, timeout)) { 2506 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2507 atomic_long_inc(&work->port-> 2508 counter_group[CM_RECV_DUPLICATES]. 2509 counter[CM_MRA_COUNTER]); 2510 goto out; 2511 } 2512 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2513 break; 2514 case IB_CM_MRA_REQ_RCVD: 2515 case IB_CM_MRA_REP_RCVD: 2516 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2517 counter[CM_MRA_COUNTER]); 2518 /* fall through */ 2519 default: 2520 goto out; 2521 } 2522 2523 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2524 cm_id_priv->id.state; 2525 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2526 if (!ret) 2527 list_add_tail(&work->list, &cm_id_priv->work_list); 2528 spin_unlock_irq(&cm_id_priv->lock); 2529 2530 if (ret) 2531 cm_process_work(cm_id_priv, work); 2532 else 2533 cm_deref_id(cm_id_priv); 2534 return 0; 2535out: 2536 spin_unlock_irq(&cm_id_priv->lock); 2537 cm_deref_id(cm_id_priv); 2538 return -EINVAL; 2539} 2540 2541static void cm_format_lap(struct cm_lap_msg *lap_msg, 2542 struct cm_id_private *cm_id_priv, 2543 struct ib_sa_path_rec *alternate_path, 2544 const void *private_data, 2545 u8 private_data_len) 2546{ 2547 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2548 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2549 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2550 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2551 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2552 /* todo: need remote CM response timeout */ 2553 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2554 lap_msg->alt_local_lid = alternate_path->slid; 2555 lap_msg->alt_remote_lid = alternate_path->dlid; 2556 lap_msg->alt_local_gid = alternate_path->sgid; 2557 lap_msg->alt_remote_gid = alternate_path->dgid; 2558 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2559 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2560 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2561 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2562 cm_lap_set_sl(lap_msg, alternate_path->sl); 2563 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2564 cm_lap_set_local_ack_timeout(lap_msg, 2565 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2566 alternate_path->packet_life_time)); 2567 2568 if (private_data && private_data_len) 2569 memcpy(lap_msg->private_data, private_data, private_data_len); 2570} 2571 2572int ib_send_cm_lap(struct ib_cm_id *cm_id, 2573 struct ib_sa_path_rec *alternate_path, 2574 const void *private_data, 2575 u8 private_data_len) 2576{ 2577 struct cm_id_private *cm_id_priv; 2578 struct ib_mad_send_buf *msg; 2579 unsigned long flags; 2580 int ret; 2581 2582 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2583 return -EINVAL; 2584 2585 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2586 spin_lock_irqsave(&cm_id_priv->lock, flags); 2587 if (cm_id->state != IB_CM_ESTABLISHED || 2588 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2589 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2590 ret = -EINVAL; 2591 goto out; 2592 } 2593 2594 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2595 if (ret) 2596 goto out; 2597 cm_id_priv->alt_av.timeout = 2598 cm_ack_timeout(cm_id_priv->target_ack_delay, 2599 cm_id_priv->alt_av.timeout - 1); 2600 2601 ret = cm_alloc_msg(cm_id_priv, &msg); 2602 if (ret) 2603 goto out; 2604 2605 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2606 alternate_path, private_data, private_data_len); 2607 msg->timeout_ms = cm_id_priv->timeout_ms; 2608 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2609 2610 ret = ib_post_send_mad(msg, NULL); 2611 if (ret) { 2612 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2613 cm_free_msg(msg); 2614 return ret; 2615 } 2616 2617 cm_id->lap_state = IB_CM_LAP_SENT; 2618 cm_id_priv->msg = msg; 2619 2620out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2621 return ret; 2622} 2623EXPORT_SYMBOL(ib_send_cm_lap); 2624 2625static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2626 struct ib_sa_path_rec *path, 2627 struct cm_lap_msg *lap_msg) 2628{ 2629 memset(path, 0, sizeof *path); 2630 path->dgid = lap_msg->alt_local_gid; 2631 path->sgid = lap_msg->alt_remote_gid; 2632 path->dlid = lap_msg->alt_local_lid; 2633 path->slid = lap_msg->alt_remote_lid; 2634 path->flow_label = cm_lap_get_flow_label(lap_msg); 2635 path->hop_limit = lap_msg->alt_hop_limit; 2636 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2637 path->reversible = 1; 2638 path->pkey = cm_id_priv->pkey; 2639 path->sl = cm_lap_get_sl(lap_msg); 2640 path->mtu_selector = IB_SA_EQ; 2641 path->mtu = cm_id_priv->path_mtu; 2642 path->rate_selector = IB_SA_EQ; 2643 path->rate = cm_lap_get_packet_rate(lap_msg); 2644 path->packet_life_time_selector = IB_SA_EQ; 2645 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2646 path->packet_life_time -= (path->packet_life_time > 0); 2647} 2648 2649static int cm_lap_handler(struct cm_work *work) 2650{ 2651 struct cm_id_private *cm_id_priv; 2652 struct cm_lap_msg *lap_msg; 2653 struct ib_cm_lap_event_param *param; 2654 struct ib_mad_send_buf *msg = NULL; 2655 int ret; 2656 2657 /* todo: verify LAP request and send reject APR if invalid. */ 2658 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2659 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2660 lap_msg->local_comm_id); 2661 if (!cm_id_priv) 2662 return -EINVAL; 2663 2664 param = &work->cm_event.param.lap_rcvd; 2665 param->alternate_path = &work->path[0]; 2666 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2667 work->cm_event.private_data = &lap_msg->private_data; 2668 2669 spin_lock_irq(&cm_id_priv->lock); 2670 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2671 goto unlock; 2672 2673 switch (cm_id_priv->id.lap_state) { 2674 case IB_CM_LAP_UNINIT: 2675 case IB_CM_LAP_IDLE: 2676 break; 2677 case IB_CM_MRA_LAP_SENT: 2678 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2679 counter[CM_LAP_COUNTER]); 2680 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2681 goto unlock; 2682 2683 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2684 CM_MSG_RESPONSE_OTHER, 2685 cm_id_priv->service_timeout, 2686 cm_id_priv->private_data, 2687 cm_id_priv->private_data_len); 2688 spin_unlock_irq(&cm_id_priv->lock); 2689 2690 if (ib_post_send_mad(msg, NULL)) 2691 cm_free_msg(msg); 2692 goto deref; 2693 case IB_CM_LAP_RCVD: 2694 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2695 counter[CM_LAP_COUNTER]); 2696 goto unlock; 2697 default: 2698 goto unlock; 2699 } 2700 2701 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2702 cm_id_priv->tid = lap_msg->hdr.tid; 2703 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2704 work->mad_recv_wc->recv_buf.grh, 2705 &cm_id_priv->av); 2706 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2707 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2708 if (!ret) 2709 list_add_tail(&work->list, &cm_id_priv->work_list); 2710 spin_unlock_irq(&cm_id_priv->lock); 2711 2712 if (ret) 2713 cm_process_work(cm_id_priv, work); 2714 else 2715 cm_deref_id(cm_id_priv); 2716 return 0; 2717 2718unlock: spin_unlock_irq(&cm_id_priv->lock); 2719deref: cm_deref_id(cm_id_priv); 2720 return -EINVAL; 2721} 2722 2723static void cm_format_apr(struct cm_apr_msg *apr_msg, 2724 struct cm_id_private *cm_id_priv, 2725 enum ib_cm_apr_status status, 2726 void *info, 2727 u8 info_length, 2728 const void *private_data, 2729 u8 private_data_len) 2730{ 2731 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2732 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2733 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2734 apr_msg->ap_status = (u8) status; 2735 2736 if (info && info_length) { 2737 apr_msg->info_length = info_length; 2738 memcpy(apr_msg->info, info, info_length); 2739 } 2740 2741 if (private_data && private_data_len) 2742 memcpy(apr_msg->private_data, private_data, private_data_len); 2743} 2744 2745int ib_send_cm_apr(struct ib_cm_id *cm_id, 2746 enum ib_cm_apr_status status, 2747 void *info, 2748 u8 info_length, 2749 const void *private_data, 2750 u8 private_data_len) 2751{ 2752 struct cm_id_private *cm_id_priv; 2753 struct ib_mad_send_buf *msg; 2754 unsigned long flags; 2755 int ret; 2756 2757 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2758 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2759 return -EINVAL; 2760 2761 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2762 spin_lock_irqsave(&cm_id_priv->lock, flags); 2763 if (cm_id->state != IB_CM_ESTABLISHED || 2764 (cm_id->lap_state != IB_CM_LAP_RCVD && 2765 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2766 ret = -EINVAL; 2767 goto out; 2768 } 2769 2770 ret = cm_alloc_msg(cm_id_priv, &msg); 2771 if (ret) 2772 goto out; 2773 2774 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2775 info, info_length, private_data, private_data_len); 2776 ret = ib_post_send_mad(msg, NULL); 2777 if (ret) { 2778 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2779 cm_free_msg(msg); 2780 return ret; 2781 } 2782 2783 cm_id->lap_state = IB_CM_LAP_IDLE; 2784out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2785 return ret; 2786} 2787EXPORT_SYMBOL(ib_send_cm_apr); 2788 2789static int cm_apr_handler(struct cm_work *work) 2790{ 2791 struct cm_id_private *cm_id_priv; 2792 struct cm_apr_msg *apr_msg; 2793 int ret; 2794 2795 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2796 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2797 apr_msg->local_comm_id); 2798 if (!cm_id_priv) 2799 return -EINVAL; /* Unmatched reply. */ 2800 2801 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2802 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2803 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2804 work->cm_event.private_data = &apr_msg->private_data; 2805 2806 spin_lock_irq(&cm_id_priv->lock); 2807 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2808 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2809 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2810 spin_unlock_irq(&cm_id_priv->lock); 2811 goto out; 2812 } 2813 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2814 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2815 cm_id_priv->msg = NULL; 2816 2817 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2818 if (!ret) 2819 list_add_tail(&work->list, &cm_id_priv->work_list); 2820 spin_unlock_irq(&cm_id_priv->lock); 2821 2822 if (ret) 2823 cm_process_work(cm_id_priv, work); 2824 else 2825 cm_deref_id(cm_id_priv); 2826 return 0; 2827out: 2828 cm_deref_id(cm_id_priv); 2829 return -EINVAL; 2830} 2831 2832static int cm_timewait_handler(struct cm_work *work) 2833{ 2834 struct cm_timewait_info *timewait_info; 2835 struct cm_id_private *cm_id_priv; 2836 int ret; 2837 2838 timewait_info = (struct cm_timewait_info *)work; 2839 spin_lock_irq(&cm.lock); 2840 list_del(&timewait_info->list); 2841 spin_unlock_irq(&cm.lock); 2842 2843 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2844 timewait_info->work.remote_id); 2845 if (!cm_id_priv) 2846 return -EINVAL; 2847 2848 spin_lock_irq(&cm_id_priv->lock); 2849 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2850 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2851 spin_unlock_irq(&cm_id_priv->lock); 2852 goto out; 2853 } 2854 cm_id_priv->id.state = IB_CM_IDLE; 2855 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2856 if (!ret) 2857 list_add_tail(&work->list, &cm_id_priv->work_list); 2858 spin_unlock_irq(&cm_id_priv->lock); 2859 2860 if (ret) 2861 cm_process_work(cm_id_priv, work); 2862 else 2863 cm_deref_id(cm_id_priv); 2864 return 0; 2865out: 2866 cm_deref_id(cm_id_priv); 2867 return -EINVAL; 2868} 2869 2870static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2871 struct cm_id_private *cm_id_priv, 2872 struct ib_cm_sidr_req_param *param) 2873{ 2874 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2875 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2876 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2877 sidr_req_msg->pkey = param->path->pkey; 2878 sidr_req_msg->service_id = param->service_id; 2879 2880 if (param->private_data && param->private_data_len) 2881 memcpy(sidr_req_msg->private_data, param->private_data, 2882 param->private_data_len); 2883} 2884 2885int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2886 struct ib_cm_sidr_req_param *param) 2887{ 2888 struct cm_id_private *cm_id_priv; 2889 struct ib_mad_send_buf *msg; 2890 unsigned long flags; 2891 int ret; 2892 2893 if (!param->path || (param->private_data && 2894 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2895 return -EINVAL; 2896 2897 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2898 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2899 if (ret) 2900 goto out; 2901 2902 cm_id->service_id = param->service_id; 2903 cm_id->service_mask = ~cpu_to_be64(0); 2904 cm_id_priv->timeout_ms = param->timeout_ms; 2905 cm_id_priv->max_cm_retries = param->max_cm_retries; 2906 ret = cm_alloc_msg(cm_id_priv, &msg); 2907 if (ret) 2908 goto out; 2909 2910 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2911 param); 2912 msg->timeout_ms = cm_id_priv->timeout_ms; 2913 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2914 2915 spin_lock_irqsave(&cm_id_priv->lock, flags); 2916 if (cm_id->state == IB_CM_IDLE) 2917 ret = ib_post_send_mad(msg, NULL); 2918 else 2919 ret = -EINVAL; 2920 2921 if (ret) { 2922 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2923 cm_free_msg(msg); 2924 goto out; 2925 } 2926 cm_id->state = IB_CM_SIDR_REQ_SENT; 2927 cm_id_priv->msg = msg; 2928 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2929out: 2930 return ret; 2931} 2932EXPORT_SYMBOL(ib_send_cm_sidr_req); 2933 2934static void cm_format_sidr_req_event(struct cm_work *work, 2935 struct ib_cm_id *listen_id) 2936{ 2937 struct cm_sidr_req_msg *sidr_req_msg; 2938 struct ib_cm_sidr_req_event_param *param; 2939 2940 sidr_req_msg = (struct cm_sidr_req_msg *) 2941 work->mad_recv_wc->recv_buf.mad; 2942 param = &work->cm_event.param.sidr_req_rcvd; 2943 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2944 param->listen_id = listen_id; 2945 param->port = work->port->port_num; 2946 work->cm_event.private_data = &sidr_req_msg->private_data; 2947} 2948 2949static int cm_sidr_req_handler(struct cm_work *work) 2950{ 2951 struct ib_cm_id *cm_id; 2952 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2953 struct cm_sidr_req_msg *sidr_req_msg; 2954 struct ib_wc *wc; 2955 2956 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2957 if (IS_ERR(cm_id)) 2958 return PTR_ERR(cm_id); 2959 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2960 2961 /* Record SGID/SLID and request ID for lookup. */ 2962 sidr_req_msg = (struct cm_sidr_req_msg *) 2963 work->mad_recv_wc->recv_buf.mad; 2964 wc = work->mad_recv_wc->wc; 2965 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2966 cm_id_priv->av.dgid.global.interface_id = 0; 2967 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2968 work->mad_recv_wc->recv_buf.grh, 2969 &cm_id_priv->av); 2970 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2971 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2972 atomic_inc(&cm_id_priv->work_count); 2973 2974 spin_lock_irq(&cm.lock); 2975 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2976 if (cur_cm_id_priv) { 2977 spin_unlock_irq(&cm.lock); 2978 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2979 counter[CM_SIDR_REQ_COUNTER]); 2980 goto out; /* Duplicate message. */ 2981 } 2982 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2983 cur_cm_id_priv = cm_find_listen(cm_id->device, 2984 sidr_req_msg->service_id, 2985 sidr_req_msg->private_data); 2986 if (!cur_cm_id_priv) { 2987 spin_unlock_irq(&cm.lock); 2988 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2989 goto out; /* No match. */ 2990 } 2991 atomic_inc(&cur_cm_id_priv->refcount); 2992 atomic_inc(&cm_id_priv->refcount); 2993 spin_unlock_irq(&cm.lock); 2994 2995 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2996 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2997 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2998 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2999 3000 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3001 cm_process_work(cm_id_priv, work); 3002 cm_deref_id(cur_cm_id_priv); 3003 return 0; 3004out: 3005 ib_destroy_cm_id(&cm_id_priv->id); 3006 return -EINVAL; 3007} 3008 3009static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3010 struct cm_id_private *cm_id_priv, 3011 struct ib_cm_sidr_rep_param *param) 3012{ 3013 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3014 cm_id_priv->tid); 3015 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3016 sidr_rep_msg->status = param->status; 3017 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3018 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3019 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3020 3021 if (param->info && param->info_length) 3022 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3023 3024 if (param->private_data && param->private_data_len) 3025 memcpy(sidr_rep_msg->private_data, param->private_data, 3026 param->private_data_len); 3027} 3028 3029int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3030 struct ib_cm_sidr_rep_param *param) 3031{ 3032 struct cm_id_private *cm_id_priv; 3033 struct ib_mad_send_buf *msg; 3034 unsigned long flags; 3035 int ret; 3036 3037 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3038 (param->private_data && 3039 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3040 return -EINVAL; 3041 3042 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3043 spin_lock_irqsave(&cm_id_priv->lock, flags); 3044 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3045 ret = -EINVAL; 3046 goto error; 3047 } 3048 3049 ret = cm_alloc_msg(cm_id_priv, &msg); 3050 if (ret) 3051 goto error; 3052 3053 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3054 param); 3055 ret = ib_post_send_mad(msg, NULL); 3056 if (ret) { 3057 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3058 cm_free_msg(msg); 3059 return ret; 3060 } 3061 cm_id->state = IB_CM_IDLE; 3062 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3063 3064 spin_lock_irqsave(&cm.lock, flags); 3065 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3066 spin_unlock_irqrestore(&cm.lock, flags); 3067 return 0; 3068 3069error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3070 return ret; 3071} 3072EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3073 3074static void cm_format_sidr_rep_event(struct cm_work *work) 3075{ 3076 struct cm_sidr_rep_msg *sidr_rep_msg; 3077 struct ib_cm_sidr_rep_event_param *param; 3078 3079 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3080 work->mad_recv_wc->recv_buf.mad; 3081 param = &work->cm_event.param.sidr_rep_rcvd; 3082 param->status = sidr_rep_msg->status; 3083 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3084 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3085 param->info = &sidr_rep_msg->info; 3086 param->info_len = sidr_rep_msg->info_length; 3087 work->cm_event.private_data = &sidr_rep_msg->private_data; 3088} 3089 3090static int cm_sidr_rep_handler(struct cm_work *work) 3091{ 3092 struct cm_sidr_rep_msg *sidr_rep_msg; 3093 struct cm_id_private *cm_id_priv; 3094 3095 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3096 work->mad_recv_wc->recv_buf.mad; 3097 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3098 if (!cm_id_priv) 3099 return -EINVAL; /* Unmatched reply. */ 3100 3101 spin_lock_irq(&cm_id_priv->lock); 3102 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3103 spin_unlock_irq(&cm_id_priv->lock); 3104 goto out; 3105 } 3106 cm_id_priv->id.state = IB_CM_IDLE; 3107 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3108 spin_unlock_irq(&cm_id_priv->lock); 3109 3110 cm_format_sidr_rep_event(work); 3111 cm_process_work(cm_id_priv, work); 3112 return 0; 3113out: 3114 cm_deref_id(cm_id_priv); 3115 return -EINVAL; 3116} 3117 3118static void cm_process_send_error(struct ib_mad_send_buf *msg, 3119 enum ib_wc_status wc_status) 3120{ 3121 struct cm_id_private *cm_id_priv; 3122 struct ib_cm_event cm_event; 3123 enum ib_cm_state state; 3124 int ret; 3125 3126 memset(&cm_event, 0, sizeof cm_event); 3127 cm_id_priv = msg->context[0]; 3128 3129 /* Discard old sends or ones without a response. */ 3130 spin_lock_irq(&cm_id_priv->lock); 3131 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3132 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3133 goto discard; 3134 3135 switch (state) { 3136 case IB_CM_REQ_SENT: 3137 case IB_CM_MRA_REQ_RCVD: 3138 cm_reset_to_idle(cm_id_priv); 3139 cm_event.event = IB_CM_REQ_ERROR; 3140 break; 3141 case IB_CM_REP_SENT: 3142 case IB_CM_MRA_REP_RCVD: 3143 cm_reset_to_idle(cm_id_priv); 3144 cm_event.event = IB_CM_REP_ERROR; 3145 break; 3146 case IB_CM_DREQ_SENT: 3147 cm_enter_timewait(cm_id_priv); 3148 cm_event.event = IB_CM_DREQ_ERROR; 3149 break; 3150 case IB_CM_SIDR_REQ_SENT: 3151 cm_id_priv->id.state = IB_CM_IDLE; 3152 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3153 break; 3154 default: 3155 goto discard; 3156 } 3157 spin_unlock_irq(&cm_id_priv->lock); 3158 cm_event.param.send_status = wc_status; 3159 3160 /* No other events can occur on the cm_id at this point. */ 3161 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3162 cm_free_msg(msg); 3163 if (ret) 3164 ib_destroy_cm_id(&cm_id_priv->id); 3165 return; 3166discard: 3167 spin_unlock_irq(&cm_id_priv->lock); 3168 cm_free_msg(msg); 3169} 3170 3171static void cm_send_handler(struct ib_mad_agent *mad_agent, 3172 struct ib_mad_send_wc *mad_send_wc) 3173{ 3174 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3175 struct cm_port *port; 3176 u16 attr_index; 3177 3178 port = mad_agent->context; 3179 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3180 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3181 3182 /* 3183 * If the send was in response to a received message (context[0] is not 3184 * set to a cm_id), and is not a REJ, then it is a send that was 3185 * manually retried. 3186 */ 3187 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3188 msg->retries = 1; 3189 3190 atomic_long_add(1 + msg->retries, 3191 &port->counter_group[CM_XMIT].counter[attr_index]); 3192 if (msg->retries) 3193 atomic_long_add(msg->retries, 3194 &port->counter_group[CM_XMIT_RETRIES]. 3195 counter[attr_index]); 3196 3197 switch (mad_send_wc->status) { 3198 case IB_WC_SUCCESS: 3199 case IB_WC_WR_FLUSH_ERR: 3200 cm_free_msg(msg); 3201 break; 3202 default: 3203 if (msg->context[0] && msg->context[1]) 3204 cm_process_send_error(msg, mad_send_wc->status); 3205 else 3206 cm_free_msg(msg); 3207 break; 3208 } 3209} 3210 3211static void cm_work_handler(struct work_struct *_work) 3212{ 3213 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3214 int ret; 3215 3216 switch (work->cm_event.event) { 3217 case IB_CM_REQ_RECEIVED: 3218 ret = cm_req_handler(work); 3219 break; 3220 case IB_CM_MRA_RECEIVED: 3221 ret = cm_mra_handler(work); 3222 break; 3223 case IB_CM_REJ_RECEIVED: 3224 ret = cm_rej_handler(work); 3225 break; 3226 case IB_CM_REP_RECEIVED: 3227 ret = cm_rep_handler(work); 3228 break; 3229 case IB_CM_RTU_RECEIVED: 3230 ret = cm_rtu_handler(work); 3231 break; 3232 case IB_CM_USER_ESTABLISHED: 3233 ret = cm_establish_handler(work); 3234 break; 3235 case IB_CM_DREQ_RECEIVED: 3236 ret = cm_dreq_handler(work); 3237 break; 3238 case IB_CM_DREP_RECEIVED: 3239 ret = cm_drep_handler(work); 3240 break; 3241 case IB_CM_SIDR_REQ_RECEIVED: 3242 ret = cm_sidr_req_handler(work); 3243 break; 3244 case IB_CM_SIDR_REP_RECEIVED: 3245 ret = cm_sidr_rep_handler(work); 3246 break; 3247 case IB_CM_LAP_RECEIVED: 3248 ret = cm_lap_handler(work); 3249 break; 3250 case IB_CM_APR_RECEIVED: 3251 ret = cm_apr_handler(work); 3252 break; 3253 case IB_CM_TIMEWAIT_EXIT: 3254 ret = cm_timewait_handler(work); 3255 break; 3256 default: 3257 ret = -EINVAL; 3258 break; 3259 } 3260 if (ret) 3261 cm_free_work(work); 3262} 3263 3264static int cm_establish(struct ib_cm_id *cm_id) 3265{ 3266 struct cm_id_private *cm_id_priv; 3267 struct cm_work *work; 3268 unsigned long flags; 3269 int ret = 0; 3270 3271 work = kmalloc(sizeof *work, GFP_ATOMIC); 3272 if (!work) 3273 return -ENOMEM; 3274 3275 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3276 spin_lock_irqsave(&cm_id_priv->lock, flags); 3277 switch (cm_id->state) 3278 { 3279 case IB_CM_REP_SENT: 3280 case IB_CM_MRA_REP_RCVD: 3281 cm_id->state = IB_CM_ESTABLISHED; 3282 break; 3283 case IB_CM_ESTABLISHED: 3284 ret = -EISCONN; 3285 break; 3286 default: 3287 ret = -EINVAL; 3288 break; 3289 } 3290 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3291 3292 if (ret) { 3293 kfree(work); 3294 goto out; 3295 } 3296 3297 /* 3298 * The CM worker thread may try to destroy the cm_id before it 3299 * can execute this work item. To prevent potential deadlock, 3300 * we need to find the cm_id once we're in the context of the 3301 * worker thread, rather than holding a reference on it. 3302 */ 3303 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3304 work->local_id = cm_id->local_id; 3305 work->remote_id = cm_id->remote_id; 3306 work->mad_recv_wc = NULL; 3307 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3308 queue_delayed_work(cm.wq, &work->work, 0); 3309out: 3310 return ret; 3311} 3312 3313static int cm_migrate(struct ib_cm_id *cm_id) 3314{ 3315 struct cm_id_private *cm_id_priv; 3316 unsigned long flags; 3317 int ret = 0; 3318 3319 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3320 spin_lock_irqsave(&cm_id_priv->lock, flags); 3321 if (cm_id->state == IB_CM_ESTABLISHED && 3322 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3323 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3324 cm_id->lap_state = IB_CM_LAP_IDLE; 3325 cm_id_priv->av = cm_id_priv->alt_av; 3326 } else 3327 ret = -EINVAL; 3328 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3329 3330 return ret; 3331} 3332 3333int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3334{ 3335 int ret; 3336 3337 switch (event) { 3338 case IB_EVENT_COMM_EST: 3339 ret = cm_establish(cm_id); 3340 break; 3341 case IB_EVENT_PATH_MIG: 3342 ret = cm_migrate(cm_id); 3343 break; 3344 default: 3345 ret = -EINVAL; 3346 } 3347 return ret; 3348} 3349EXPORT_SYMBOL(ib_cm_notify); 3350 3351static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3352 struct ib_mad_recv_wc *mad_recv_wc) 3353{ 3354 struct cm_port *port = mad_agent->context; 3355 struct cm_work *work; 3356 enum ib_cm_event_type event; 3357 u16 attr_id; 3358 int paths = 0; 3359 3360 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3361 case CM_REQ_ATTR_ID: 3362 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3363 alt_local_lid != 0); 3364 event = IB_CM_REQ_RECEIVED; 3365 break; 3366 case CM_MRA_ATTR_ID: 3367 event = IB_CM_MRA_RECEIVED; 3368 break; 3369 case CM_REJ_ATTR_ID: 3370 event = IB_CM_REJ_RECEIVED; 3371 break; 3372 case CM_REP_ATTR_ID: 3373 event = IB_CM_REP_RECEIVED; 3374 break; 3375 case CM_RTU_ATTR_ID: 3376 event = IB_CM_RTU_RECEIVED; 3377 break; 3378 case CM_DREQ_ATTR_ID: 3379 event = IB_CM_DREQ_RECEIVED; 3380 break; 3381 case CM_DREP_ATTR_ID: 3382 event = IB_CM_DREP_RECEIVED; 3383 break; 3384 case CM_SIDR_REQ_ATTR_ID: 3385 event = IB_CM_SIDR_REQ_RECEIVED; 3386 break; 3387 case CM_SIDR_REP_ATTR_ID: 3388 event = IB_CM_SIDR_REP_RECEIVED; 3389 break; 3390 case CM_LAP_ATTR_ID: 3391 paths = 1; 3392 event = IB_CM_LAP_RECEIVED; 3393 break; 3394 case CM_APR_ATTR_ID: 3395 event = IB_CM_APR_RECEIVED; 3396 break; 3397 default: 3398 ib_free_recv_mad(mad_recv_wc); 3399 return; 3400 } 3401 3402 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3403 atomic_long_inc(&port->counter_group[CM_RECV]. 3404 counter[attr_id - CM_ATTR_ID_OFFSET]); 3405 3406 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3407 GFP_KERNEL); 3408 if (!work) { 3409 ib_free_recv_mad(mad_recv_wc); 3410 return; 3411 } 3412 3413 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3414 work->cm_event.event = event; 3415 work->mad_recv_wc = mad_recv_wc; 3416 work->port = port; 3417 queue_delayed_work(cm.wq, &work->work, 0); 3418} 3419 3420static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3421 struct ib_qp_attr *qp_attr, 3422 int *qp_attr_mask) 3423{ 3424 unsigned long flags; 3425 int ret; 3426 3427 spin_lock_irqsave(&cm_id_priv->lock, flags); 3428 switch (cm_id_priv->id.state) { 3429 case IB_CM_REQ_SENT: 3430 case IB_CM_MRA_REQ_RCVD: 3431 case IB_CM_REQ_RCVD: 3432 case IB_CM_MRA_REQ_SENT: 3433 case IB_CM_REP_RCVD: 3434 case IB_CM_MRA_REP_SENT: 3435 case IB_CM_REP_SENT: 3436 case IB_CM_MRA_REP_RCVD: 3437 case IB_CM_ESTABLISHED: 3438 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3439 IB_QP_PKEY_INDEX | IB_QP_PORT; 3440 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3441 if (cm_id_priv->responder_resources) 3442 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3443 IB_ACCESS_REMOTE_ATOMIC; 3444 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3445 qp_attr->port_num = cm_id_priv->av.port->port_num; 3446 ret = 0; 3447 break; 3448 default: 3449 ret = -EINVAL; 3450 break; 3451 } 3452 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3453 return ret; 3454} 3455 3456static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3457 struct ib_qp_attr *qp_attr, 3458 int *qp_attr_mask) 3459{ 3460 unsigned long flags; 3461 int ret; 3462 3463 spin_lock_irqsave(&cm_id_priv->lock, flags); 3464 switch (cm_id_priv->id.state) { 3465 case IB_CM_REQ_RCVD: 3466 case IB_CM_MRA_REQ_SENT: 3467 case IB_CM_REP_RCVD: 3468 case IB_CM_MRA_REP_SENT: 3469 case IB_CM_REP_SENT: 3470 case IB_CM_MRA_REP_RCVD: 3471 case IB_CM_ESTABLISHED: 3472 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3473 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3474 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3475 qp_attr->path_mtu = cm_id_priv->path_mtu; 3476 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3477 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3478 if (cm_id_priv->qp_type == IB_QPT_RC) { 3479 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3480 IB_QP_MIN_RNR_TIMER; 3481 qp_attr->max_dest_rd_atomic = 3482 cm_id_priv->responder_resources; 3483 qp_attr->min_rnr_timer = 0; 3484 } 3485 if (cm_id_priv->alt_av.ah_attr.dlid) { 3486 *qp_attr_mask |= IB_QP_ALT_PATH; 3487 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3488 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3489 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3490 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3491 } 3492 ret = 0; 3493 break; 3494 default: 3495 ret = -EINVAL; 3496 break; 3497 } 3498 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3499 return ret; 3500} 3501 3502static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3503 struct ib_qp_attr *qp_attr, 3504 int *qp_attr_mask) 3505{ 3506 unsigned long flags; 3507 int ret; 3508 3509 spin_lock_irqsave(&cm_id_priv->lock, flags); 3510 switch (cm_id_priv->id.state) { 3511 /* Allow transition to RTS before sending REP */ 3512 case IB_CM_REQ_RCVD: 3513 case IB_CM_MRA_REQ_SENT: 3514 3515 case IB_CM_REP_RCVD: 3516 case IB_CM_MRA_REP_SENT: 3517 case IB_CM_REP_SENT: 3518 case IB_CM_MRA_REP_RCVD: 3519 case IB_CM_ESTABLISHED: 3520 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3521 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3522 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3523 if (cm_id_priv->qp_type == IB_QPT_RC) { 3524 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3525 IB_QP_RNR_RETRY | 3526 IB_QP_MAX_QP_RD_ATOMIC; 3527 qp_attr->timeout = cm_id_priv->av.timeout; 3528 qp_attr->retry_cnt = cm_id_priv->retry_count; 3529 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3530 qp_attr->max_rd_atomic = 3531 cm_id_priv->initiator_depth; 3532 } 3533 if (cm_id_priv->alt_av.ah_attr.dlid) { 3534 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3535 qp_attr->path_mig_state = IB_MIG_REARM; 3536 } 3537 } else { 3538 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3539 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3540 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3541 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3542 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3543 qp_attr->path_mig_state = IB_MIG_REARM; 3544 } 3545 ret = 0; 3546 break; 3547 default: 3548 ret = -EINVAL; 3549 break; 3550 } 3551 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3552 return ret; 3553} 3554 3555int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3556 struct ib_qp_attr *qp_attr, 3557 int *qp_attr_mask) 3558{ 3559 struct cm_id_private *cm_id_priv; 3560 int ret; 3561 3562 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3563 switch (qp_attr->qp_state) { 3564 case IB_QPS_INIT: 3565 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3566 break; 3567 case IB_QPS_RTR: 3568 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3569 break; 3570 case IB_QPS_RTS: 3571 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3572 break; 3573 default: 3574 ret = -EINVAL; 3575 break; 3576 } 3577 return ret; 3578} 3579EXPORT_SYMBOL(ib_cm_init_qp_attr); 3580 3581static void cm_get_ack_delay(struct cm_device *cm_dev) 3582{ 3583 struct ib_device_attr attr; 3584 3585 if (ib_query_device(cm_dev->ib_device, &attr)) 3586 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3587 else 3588 cm_dev->ack_delay = attr.local_ca_ack_delay; 3589} 3590 3591static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3592 char *buf) 3593{ 3594 struct cm_counter_group *group; 3595 struct cm_counter_attribute *cm_attr; 3596 3597 group = container_of(obj, struct cm_counter_group, obj); 3598 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3599 3600 return sprintf(buf, "%ld\n", 3601 atomic_long_read(&group->counter[cm_attr->index])); 3602} 3603 3604static const struct sysfs_ops cm_counter_ops = { 3605 .show = cm_show_counter 3606}; 3607 3608static struct kobj_type cm_counter_obj_type = { 3609 .sysfs_ops = &cm_counter_ops, 3610 .default_attrs = cm_counter_default_attrs 3611}; 3612 3613static void cm_release_port_obj(struct kobject *obj) 3614{ 3615 struct cm_port *cm_port; 3616 3617 cm_port = container_of(obj, struct cm_port, port_obj); 3618 kfree(cm_port); 3619} 3620 3621static struct kobj_type cm_port_obj_type = { 3622 .release = cm_release_port_obj 3623}; 3624 3625struct class cm_class = { 3626 .name = "infiniband_cm", 3627}; 3628EXPORT_SYMBOL(cm_class); 3629 3630static int cm_create_port_fs(struct cm_port *port) 3631{ 3632 int i, ret; 3633 3634 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3635 &port->cm_dev->device->kobj, 3636 "%d", port->port_num); 3637 if (ret) { 3638 kfree(port); 3639 return ret; 3640 } 3641 3642 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3643 ret = kobject_init_and_add(&port->counter_group[i].obj, 3644 &cm_counter_obj_type, 3645 &port->port_obj, 3646 "%s", counter_group_names[i]); 3647 if (ret) 3648 goto error; 3649 } 3650 3651 return 0; 3652 3653error: 3654 while (i--) 3655 kobject_put(&port->counter_group[i].obj); 3656 kobject_put(&port->port_obj); 3657 return ret; 3658 3659} 3660 3661static void cm_remove_port_fs(struct cm_port *port) 3662{ 3663 int i; 3664 3665 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3666 kobject_put(&port->counter_group[i].obj); 3667 3668 kobject_put(&port->port_obj); 3669} 3670 3671static void cm_add_one(struct ib_device *ib_device) 3672{ 3673 struct cm_device *cm_dev; 3674 struct cm_port *port; 3675 struct ib_mad_reg_req reg_req = { 3676 .mgmt_class = IB_MGMT_CLASS_CM, 3677 .mgmt_class_version = IB_CM_CLASS_VERSION 3678 }; 3679 struct ib_port_modify port_modify = { 3680 .set_port_cap_mask = IB_PORT_CM_SUP 3681 }; 3682 unsigned long flags; 3683 int ret; 3684 u8 i; 3685 3686 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3687 return; 3688 3689 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3690 ib_device->phys_port_cnt, GFP_KERNEL); 3691 if (!cm_dev) 3692 return; 3693 3694 cm_dev->ib_device = ib_device; 3695 cm_get_ack_delay(cm_dev); 3696 3697 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3698 MKDEV(0, 0), NULL, 3699 "%s", ib_device->name); 3700 if (IS_ERR(cm_dev->device)) { 3701 kfree(cm_dev); 3702 return; 3703 } 3704 3705 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3706 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3707 port = kzalloc(sizeof *port, GFP_KERNEL); 3708 if (!port) 3709 goto error1; 3710 3711 cm_dev->port[i-1] = port; 3712 port->cm_dev = cm_dev; 3713 port->port_num = i; 3714 3715 ret = cm_create_port_fs(port); 3716 if (ret) 3717 goto error1; 3718 3719 port->mad_agent = ib_register_mad_agent(ib_device, i, 3720 IB_QPT_GSI, 3721 ®_req, 3722 0, 3723 cm_send_handler, 3724 cm_recv_handler, 3725 port); 3726 if (IS_ERR(port->mad_agent)) 3727 goto error2; 3728 3729 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3730 if (ret) 3731 goto error3; 3732 } 3733 ib_set_client_data(ib_device, &cm_client, cm_dev); 3734 3735 write_lock_irqsave(&cm.device_lock, flags); 3736 list_add_tail(&cm_dev->list, &cm.device_list); 3737 write_unlock_irqrestore(&cm.device_lock, flags); 3738 return; 3739 3740error3: 3741 ib_unregister_mad_agent(port->mad_agent); 3742error2: 3743 cm_remove_port_fs(port); 3744error1: 3745 port_modify.set_port_cap_mask = 0; 3746 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3747 while (--i) { 3748 port = cm_dev->port[i-1]; 3749 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3750 ib_unregister_mad_agent(port->mad_agent); 3751 cm_remove_port_fs(port); 3752 } 3753 device_unregister(cm_dev->device); 3754 kfree(cm_dev); 3755} 3756 3757static void cm_remove_one(struct ib_device *ib_device) 3758{ 3759 struct cm_device *cm_dev; 3760 struct cm_port *port; 3761 struct ib_port_modify port_modify = { 3762 .clr_port_cap_mask = IB_PORT_CM_SUP 3763 }; 3764 unsigned long flags; 3765 int i; 3766 3767 cm_dev = ib_get_client_data(ib_device, &cm_client); 3768 if (!cm_dev) 3769 return; 3770 3771 write_lock_irqsave(&cm.device_lock, flags); 3772 list_del(&cm_dev->list); 3773 write_unlock_irqrestore(&cm.device_lock, flags); 3774 3775 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3776 port = cm_dev->port[i-1]; 3777 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3778 ib_unregister_mad_agent(port->mad_agent); 3779 flush_workqueue(cm.wq); 3780 cm_remove_port_fs(port); 3781 } 3782 device_unregister(cm_dev->device); 3783 kfree(cm_dev); 3784} 3785 3786static int __init ib_cm_init(void) 3787{ 3788 int ret; 3789 3790 memset(&cm, 0, sizeof cm); 3791 INIT_LIST_HEAD(&cm.device_list); 3792 rwlock_init(&cm.device_lock); 3793 spin_lock_init(&cm.lock); 3794 cm.listen_service_table = RB_ROOT; 3795 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3796 cm.remote_id_table = RB_ROOT; 3797 cm.remote_qp_table = RB_ROOT; 3798 cm.remote_sidr_table = RB_ROOT; 3799 idr_init(&cm.local_id_table); 3800 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3801 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3802 INIT_LIST_HEAD(&cm.timewait_list); 3803 3804 ret = class_register(&cm_class); 3805 if (ret) 3806 return -ENOMEM; 3807 3808 cm.wq = create_workqueue("ib_cm"); 3809 if (!cm.wq) { 3810 ret = -ENOMEM; 3811 goto error1; 3812 } 3813 3814 ret = ib_register_client(&cm_client); 3815 if (ret) 3816 goto error2; 3817 3818 return 0; 3819error2: 3820 destroy_workqueue(cm.wq); 3821error1: 3822 class_unregister(&cm_class); 3823 return ret; 3824} 3825 3826static void __exit ib_cm_cleanup(void) 3827{ 3828 struct cm_timewait_info *timewait_info, *tmp; 3829 3830 spin_lock_irq(&cm.lock); 3831 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3832 cancel_delayed_work(&timewait_info->work.work); 3833 spin_unlock_irq(&cm.lock); 3834 3835 ib_unregister_client(&cm_client); 3836 destroy_workqueue(cm.wq); 3837 3838 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3839 list_del(&timewait_info->list); 3840 kfree(timewait_info); 3841 } 3842 3843 class_unregister(&cm_class); 3844 idr_destroy(&cm.local_id_table); 3845} 3846 3847module_init(ib_cm_init); 3848module_exit(ib_cm_cleanup); 3849 3850