cm.c revision 2622e18ef407a8e8e3ddc3d6f0c77b756c493798
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 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 893 break; 894 ib_send_cm_dreq(cm_id, NULL, 0); 895 goto retest; 896 case IB_CM_DREQ_SENT: 897 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 898 cm_enter_timewait(cm_id_priv); 899 spin_unlock_irq(&cm_id_priv->lock); 900 break; 901 case IB_CM_DREQ_RCVD: 902 spin_unlock_irq(&cm_id_priv->lock); 903 ib_send_cm_drep(cm_id, NULL, 0); 904 break; 905 default: 906 spin_unlock_irq(&cm_id_priv->lock); 907 break; 908 } 909 910 cm_free_id(cm_id->local_id); 911 cm_deref_id(cm_id_priv); 912 wait_for_completion(&cm_id_priv->comp); 913 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 914 cm_free_work(work); 915 kfree(cm_id_priv->compare_data); 916 kfree(cm_id_priv->private_data); 917 kfree(cm_id_priv); 918} 919 920void ib_destroy_cm_id(struct ib_cm_id *cm_id) 921{ 922 cm_destroy_id(cm_id, 0); 923} 924EXPORT_SYMBOL(ib_destroy_cm_id); 925 926int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 927 struct ib_cm_compare_data *compare_data) 928{ 929 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 930 unsigned long flags; 931 int ret = 0; 932 933 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 934 service_id &= service_mask; 935 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 936 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 937 return -EINVAL; 938 939 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 940 if (cm_id->state != IB_CM_IDLE) 941 return -EINVAL; 942 943 if (compare_data) { 944 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 945 GFP_KERNEL); 946 if (!cm_id_priv->compare_data) 947 return -ENOMEM; 948 cm_mask_copy(cm_id_priv->compare_data->data, 949 compare_data->data, compare_data->mask); 950 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 951 IB_CM_COMPARE_SIZE); 952 } 953 954 cm_id->state = IB_CM_LISTEN; 955 956 spin_lock_irqsave(&cm.lock, flags); 957 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 958 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 959 cm_id->service_mask = ~cpu_to_be64(0); 960 } else { 961 cm_id->service_id = service_id; 962 cm_id->service_mask = service_mask; 963 } 964 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 965 spin_unlock_irqrestore(&cm.lock, flags); 966 967 if (cur_cm_id_priv) { 968 cm_id->state = IB_CM_IDLE; 969 kfree(cm_id_priv->compare_data); 970 cm_id_priv->compare_data = NULL; 971 ret = -EBUSY; 972 } 973 return ret; 974} 975EXPORT_SYMBOL(ib_cm_listen); 976 977static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 978 enum cm_msg_sequence msg_seq) 979{ 980 u64 hi_tid, low_tid; 981 982 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 983 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 984 (msg_seq << 30)); 985 return cpu_to_be64(hi_tid | low_tid); 986} 987 988static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 989 __be16 attr_id, __be64 tid) 990{ 991 hdr->base_version = IB_MGMT_BASE_VERSION; 992 hdr->mgmt_class = IB_MGMT_CLASS_CM; 993 hdr->class_version = IB_CM_CLASS_VERSION; 994 hdr->method = IB_MGMT_METHOD_SEND; 995 hdr->attr_id = attr_id; 996 hdr->tid = tid; 997} 998 999static void cm_format_req(struct cm_req_msg *req_msg, 1000 struct cm_id_private *cm_id_priv, 1001 struct ib_cm_req_param *param) 1002{ 1003 struct ib_sa_path_rec *pri_path = param->primary_path; 1004 struct ib_sa_path_rec *alt_path = param->alternate_path; 1005 1006 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1007 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1008 1009 req_msg->local_comm_id = cm_id_priv->id.local_id; 1010 req_msg->service_id = param->service_id; 1011 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1012 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1013 cm_req_set_init_depth(req_msg, param->initiator_depth); 1014 cm_req_set_remote_resp_timeout(req_msg, 1015 param->remote_cm_response_timeout); 1016 cm_req_set_qp_type(req_msg, param->qp_type); 1017 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1018 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1019 cm_req_set_local_resp_timeout(req_msg, 1020 param->local_cm_response_timeout); 1021 req_msg->pkey = param->primary_path->pkey; 1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1023 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1024 1025 if (param->qp_type != IB_QPT_XRC_INI) { 1026 cm_req_set_resp_res(req_msg, param->responder_resources); 1027 cm_req_set_retry_count(req_msg, param->retry_count); 1028 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1029 cm_req_set_srq(req_msg, param->srq); 1030 } 1031 1032 if (pri_path->hop_limit <= 1) { 1033 req_msg->primary_local_lid = pri_path->slid; 1034 req_msg->primary_remote_lid = pri_path->dlid; 1035 } else { 1036 /* Work-around until there's a way to obtain remote LID info */ 1037 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1038 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1039 } 1040 req_msg->primary_local_gid = pri_path->sgid; 1041 req_msg->primary_remote_gid = pri_path->dgid; 1042 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1043 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1044 req_msg->primary_traffic_class = pri_path->traffic_class; 1045 req_msg->primary_hop_limit = pri_path->hop_limit; 1046 cm_req_set_primary_sl(req_msg, pri_path->sl); 1047 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1048 cm_req_set_primary_local_ack_timeout(req_msg, 1049 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1050 pri_path->packet_life_time)); 1051 1052 if (alt_path) { 1053 if (alt_path->hop_limit <= 1) { 1054 req_msg->alt_local_lid = alt_path->slid; 1055 req_msg->alt_remote_lid = alt_path->dlid; 1056 } else { 1057 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1058 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1059 } 1060 req_msg->alt_local_gid = alt_path->sgid; 1061 req_msg->alt_remote_gid = alt_path->dgid; 1062 cm_req_set_alt_flow_label(req_msg, 1063 alt_path->flow_label); 1064 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1065 req_msg->alt_traffic_class = alt_path->traffic_class; 1066 req_msg->alt_hop_limit = alt_path->hop_limit; 1067 cm_req_set_alt_sl(req_msg, alt_path->sl); 1068 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1069 cm_req_set_alt_local_ack_timeout(req_msg, 1070 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1071 alt_path->packet_life_time)); 1072 } 1073 1074 if (param->private_data && param->private_data_len) 1075 memcpy(req_msg->private_data, param->private_data, 1076 param->private_data_len); 1077} 1078 1079static int cm_validate_req_param(struct ib_cm_req_param *param) 1080{ 1081 /* peer-to-peer not supported */ 1082 if (param->peer_to_peer) 1083 return -EINVAL; 1084 1085 if (!param->primary_path) 1086 return -EINVAL; 1087 1088 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1089 param->qp_type != IB_QPT_XRC_INI) 1090 return -EINVAL; 1091 1092 if (param->private_data && 1093 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1094 return -EINVAL; 1095 1096 if (param->alternate_path && 1097 (param->alternate_path->pkey != param->primary_path->pkey || 1098 param->alternate_path->mtu != param->primary_path->mtu)) 1099 return -EINVAL; 1100 1101 return 0; 1102} 1103 1104int ib_send_cm_req(struct ib_cm_id *cm_id, 1105 struct ib_cm_req_param *param) 1106{ 1107 struct cm_id_private *cm_id_priv; 1108 struct cm_req_msg *req_msg; 1109 unsigned long flags; 1110 int ret; 1111 1112 ret = cm_validate_req_param(param); 1113 if (ret) 1114 return ret; 1115 1116 /* Verify that we're not in timewait. */ 1117 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1118 spin_lock_irqsave(&cm_id_priv->lock, flags); 1119 if (cm_id->state != IB_CM_IDLE) { 1120 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1121 ret = -EINVAL; 1122 goto out; 1123 } 1124 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1125 1126 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1127 id.local_id); 1128 if (IS_ERR(cm_id_priv->timewait_info)) { 1129 ret = PTR_ERR(cm_id_priv->timewait_info); 1130 goto out; 1131 } 1132 1133 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1134 if (ret) 1135 goto error1; 1136 if (param->alternate_path) { 1137 ret = cm_init_av_by_path(param->alternate_path, 1138 &cm_id_priv->alt_av); 1139 if (ret) 1140 goto error1; 1141 } 1142 cm_id->service_id = param->service_id; 1143 cm_id->service_mask = ~cpu_to_be64(0); 1144 cm_id_priv->timeout_ms = cm_convert_to_ms( 1145 param->primary_path->packet_life_time) * 2 + 1146 cm_convert_to_ms( 1147 param->remote_cm_response_timeout); 1148 cm_id_priv->max_cm_retries = param->max_cm_retries; 1149 cm_id_priv->initiator_depth = param->initiator_depth; 1150 cm_id_priv->responder_resources = param->responder_resources; 1151 cm_id_priv->retry_count = param->retry_count; 1152 cm_id_priv->path_mtu = param->primary_path->mtu; 1153 cm_id_priv->pkey = param->primary_path->pkey; 1154 cm_id_priv->qp_type = param->qp_type; 1155 1156 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1157 if (ret) 1158 goto error1; 1159 1160 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1161 cm_format_req(req_msg, cm_id_priv, param); 1162 cm_id_priv->tid = req_msg->hdr.tid; 1163 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1164 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1165 1166 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1167 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1168 1169 spin_lock_irqsave(&cm_id_priv->lock, flags); 1170 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1171 if (ret) { 1172 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1173 goto error2; 1174 } 1175 BUG_ON(cm_id->state != IB_CM_IDLE); 1176 cm_id->state = IB_CM_REQ_SENT; 1177 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1178 return 0; 1179 1180error2: cm_free_msg(cm_id_priv->msg); 1181error1: kfree(cm_id_priv->timewait_info); 1182out: return ret; 1183} 1184EXPORT_SYMBOL(ib_send_cm_req); 1185 1186static int cm_issue_rej(struct cm_port *port, 1187 struct ib_mad_recv_wc *mad_recv_wc, 1188 enum ib_cm_rej_reason reason, 1189 enum cm_msg_response msg_rejected, 1190 void *ari, u8 ari_length) 1191{ 1192 struct ib_mad_send_buf *msg = NULL; 1193 struct cm_rej_msg *rej_msg, *rcv_msg; 1194 int ret; 1195 1196 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1197 if (ret) 1198 return ret; 1199 1200 /* We just need common CM header information. Cast to any message. */ 1201 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1202 rej_msg = (struct cm_rej_msg *) msg->mad; 1203 1204 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1205 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1206 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1207 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1208 rej_msg->reason = cpu_to_be16(reason); 1209 1210 if (ari && ari_length) { 1211 cm_rej_set_reject_info_len(rej_msg, ari_length); 1212 memcpy(rej_msg->ari, ari, ari_length); 1213 } 1214 1215 ret = ib_post_send_mad(msg, NULL); 1216 if (ret) 1217 cm_free_msg(msg); 1218 1219 return ret; 1220} 1221 1222static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1223 __be32 local_qpn, __be32 remote_qpn) 1224{ 1225 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1226 ((local_ca_guid == remote_ca_guid) && 1227 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1228} 1229 1230static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1231 struct ib_sa_path_rec *primary_path, 1232 struct ib_sa_path_rec *alt_path) 1233{ 1234 memset(primary_path, 0, sizeof *primary_path); 1235 primary_path->dgid = req_msg->primary_local_gid; 1236 primary_path->sgid = req_msg->primary_remote_gid; 1237 primary_path->dlid = req_msg->primary_local_lid; 1238 primary_path->slid = req_msg->primary_remote_lid; 1239 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1240 primary_path->hop_limit = req_msg->primary_hop_limit; 1241 primary_path->traffic_class = req_msg->primary_traffic_class; 1242 primary_path->reversible = 1; 1243 primary_path->pkey = req_msg->pkey; 1244 primary_path->sl = cm_req_get_primary_sl(req_msg); 1245 primary_path->mtu_selector = IB_SA_EQ; 1246 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1247 primary_path->rate_selector = IB_SA_EQ; 1248 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1249 primary_path->packet_life_time_selector = IB_SA_EQ; 1250 primary_path->packet_life_time = 1251 cm_req_get_primary_local_ack_timeout(req_msg); 1252 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1253 1254 if (req_msg->alt_local_lid) { 1255 memset(alt_path, 0, sizeof *alt_path); 1256 alt_path->dgid = req_msg->alt_local_gid; 1257 alt_path->sgid = req_msg->alt_remote_gid; 1258 alt_path->dlid = req_msg->alt_local_lid; 1259 alt_path->slid = req_msg->alt_remote_lid; 1260 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1261 alt_path->hop_limit = req_msg->alt_hop_limit; 1262 alt_path->traffic_class = req_msg->alt_traffic_class; 1263 alt_path->reversible = 1; 1264 alt_path->pkey = req_msg->pkey; 1265 alt_path->sl = cm_req_get_alt_sl(req_msg); 1266 alt_path->mtu_selector = IB_SA_EQ; 1267 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1268 alt_path->rate_selector = IB_SA_EQ; 1269 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1270 alt_path->packet_life_time_selector = IB_SA_EQ; 1271 alt_path->packet_life_time = 1272 cm_req_get_alt_local_ack_timeout(req_msg); 1273 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1274 } 1275} 1276 1277static void cm_format_req_event(struct cm_work *work, 1278 struct cm_id_private *cm_id_priv, 1279 struct ib_cm_id *listen_id) 1280{ 1281 struct cm_req_msg *req_msg; 1282 struct ib_cm_req_event_param *param; 1283 1284 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1285 param = &work->cm_event.param.req_rcvd; 1286 param->listen_id = listen_id; 1287 param->port = cm_id_priv->av.port->port_num; 1288 param->primary_path = &work->path[0]; 1289 if (req_msg->alt_local_lid) 1290 param->alternate_path = &work->path[1]; 1291 else 1292 param->alternate_path = NULL; 1293 param->remote_ca_guid = req_msg->local_ca_guid; 1294 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1295 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1296 param->qp_type = cm_req_get_qp_type(req_msg); 1297 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1298 param->responder_resources = cm_req_get_init_depth(req_msg); 1299 param->initiator_depth = cm_req_get_resp_res(req_msg); 1300 param->local_cm_response_timeout = 1301 cm_req_get_remote_resp_timeout(req_msg); 1302 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1303 param->remote_cm_response_timeout = 1304 cm_req_get_local_resp_timeout(req_msg); 1305 param->retry_count = cm_req_get_retry_count(req_msg); 1306 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1307 param->srq = cm_req_get_srq(req_msg); 1308 work->cm_event.private_data = &req_msg->private_data; 1309} 1310 1311static void cm_process_work(struct cm_id_private *cm_id_priv, 1312 struct cm_work *work) 1313{ 1314 int ret; 1315 1316 /* We will typically only have the current event to report. */ 1317 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1318 cm_free_work(work); 1319 1320 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1321 spin_lock_irq(&cm_id_priv->lock); 1322 work = cm_dequeue_work(cm_id_priv); 1323 spin_unlock_irq(&cm_id_priv->lock); 1324 BUG_ON(!work); 1325 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1326 &work->cm_event); 1327 cm_free_work(work); 1328 } 1329 cm_deref_id(cm_id_priv); 1330 if (ret) 1331 cm_destroy_id(&cm_id_priv->id, ret); 1332} 1333 1334static void cm_format_mra(struct cm_mra_msg *mra_msg, 1335 struct cm_id_private *cm_id_priv, 1336 enum cm_msg_response msg_mraed, u8 service_timeout, 1337 const void *private_data, u8 private_data_len) 1338{ 1339 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1340 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1341 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1342 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1343 cm_mra_set_service_timeout(mra_msg, service_timeout); 1344 1345 if (private_data && private_data_len) 1346 memcpy(mra_msg->private_data, private_data, private_data_len); 1347} 1348 1349static void cm_format_rej(struct cm_rej_msg *rej_msg, 1350 struct cm_id_private *cm_id_priv, 1351 enum ib_cm_rej_reason reason, 1352 void *ari, 1353 u8 ari_length, 1354 const void *private_data, 1355 u8 private_data_len) 1356{ 1357 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1358 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1359 1360 switch(cm_id_priv->id.state) { 1361 case IB_CM_REQ_RCVD: 1362 rej_msg->local_comm_id = 0; 1363 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1364 break; 1365 case IB_CM_MRA_REQ_SENT: 1366 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1367 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1368 break; 1369 case IB_CM_REP_RCVD: 1370 case IB_CM_MRA_REP_SENT: 1371 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1372 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1373 break; 1374 default: 1375 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1376 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1377 break; 1378 } 1379 1380 rej_msg->reason = cpu_to_be16(reason); 1381 if (ari && ari_length) { 1382 cm_rej_set_reject_info_len(rej_msg, ari_length); 1383 memcpy(rej_msg->ari, ari, ari_length); 1384 } 1385 1386 if (private_data && private_data_len) 1387 memcpy(rej_msg->private_data, private_data, private_data_len); 1388} 1389 1390static void cm_dup_req_handler(struct cm_work *work, 1391 struct cm_id_private *cm_id_priv) 1392{ 1393 struct ib_mad_send_buf *msg = NULL; 1394 int ret; 1395 1396 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1397 counter[CM_REQ_COUNTER]); 1398 1399 /* Quick state check to discard duplicate REQs. */ 1400 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1401 return; 1402 1403 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1404 if (ret) 1405 return; 1406 1407 spin_lock_irq(&cm_id_priv->lock); 1408 switch (cm_id_priv->id.state) { 1409 case IB_CM_MRA_REQ_SENT: 1410 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1411 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1412 cm_id_priv->private_data, 1413 cm_id_priv->private_data_len); 1414 break; 1415 case IB_CM_TIMEWAIT: 1416 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1417 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1418 break; 1419 default: 1420 goto unlock; 1421 } 1422 spin_unlock_irq(&cm_id_priv->lock); 1423 1424 ret = ib_post_send_mad(msg, NULL); 1425 if (ret) 1426 goto free; 1427 return; 1428 1429unlock: spin_unlock_irq(&cm_id_priv->lock); 1430free: cm_free_msg(msg); 1431} 1432 1433static struct cm_id_private * cm_match_req(struct cm_work *work, 1434 struct cm_id_private *cm_id_priv) 1435{ 1436 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1437 struct cm_timewait_info *timewait_info; 1438 struct cm_req_msg *req_msg; 1439 1440 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1441 1442 /* Check for possible duplicate REQ. */ 1443 spin_lock_irq(&cm.lock); 1444 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1445 if (timewait_info) { 1446 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1447 timewait_info->work.remote_id); 1448 spin_unlock_irq(&cm.lock); 1449 if (cur_cm_id_priv) { 1450 cm_dup_req_handler(work, cur_cm_id_priv); 1451 cm_deref_id(cur_cm_id_priv); 1452 } 1453 return NULL; 1454 } 1455 1456 /* Check for stale connections. */ 1457 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1458 if (timewait_info) { 1459 cm_cleanup_timewait(cm_id_priv->timewait_info); 1460 spin_unlock_irq(&cm.lock); 1461 cm_issue_rej(work->port, work->mad_recv_wc, 1462 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1463 NULL, 0); 1464 return NULL; 1465 } 1466 1467 /* Find matching listen request. */ 1468 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1469 req_msg->service_id, 1470 req_msg->private_data); 1471 if (!listen_cm_id_priv) { 1472 cm_cleanup_timewait(cm_id_priv->timewait_info); 1473 spin_unlock_irq(&cm.lock); 1474 cm_issue_rej(work->port, work->mad_recv_wc, 1475 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1476 NULL, 0); 1477 goto out; 1478 } 1479 atomic_inc(&listen_cm_id_priv->refcount); 1480 atomic_inc(&cm_id_priv->refcount); 1481 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1482 atomic_inc(&cm_id_priv->work_count); 1483 spin_unlock_irq(&cm.lock); 1484out: 1485 return listen_cm_id_priv; 1486} 1487 1488/* 1489 * Work-around for inter-subnet connections. If the LIDs are permissive, 1490 * we need to override the LID/SL data in the REQ with the LID information 1491 * in the work completion. 1492 */ 1493static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1494{ 1495 if (!cm_req_get_primary_subnet_local(req_msg)) { 1496 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1497 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1498 cm_req_set_primary_sl(req_msg, wc->sl); 1499 } 1500 1501 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1502 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1503 } 1504 1505 if (!cm_req_get_alt_subnet_local(req_msg)) { 1506 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1507 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1508 cm_req_set_alt_sl(req_msg, wc->sl); 1509 } 1510 1511 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1512 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1513 } 1514} 1515 1516static int cm_req_handler(struct cm_work *work) 1517{ 1518 struct ib_cm_id *cm_id; 1519 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1520 struct cm_req_msg *req_msg; 1521 int ret; 1522 1523 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1524 1525 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1526 if (IS_ERR(cm_id)) 1527 return PTR_ERR(cm_id); 1528 1529 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1530 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1531 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1532 work->mad_recv_wc->recv_buf.grh, 1533 &cm_id_priv->av); 1534 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1535 id.local_id); 1536 if (IS_ERR(cm_id_priv->timewait_info)) { 1537 ret = PTR_ERR(cm_id_priv->timewait_info); 1538 goto destroy; 1539 } 1540 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1541 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1542 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1543 1544 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1545 if (!listen_cm_id_priv) { 1546 ret = -EINVAL; 1547 kfree(cm_id_priv->timewait_info); 1548 goto destroy; 1549 } 1550 1551 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1552 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1553 cm_id_priv->id.service_id = req_msg->service_id; 1554 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1555 1556 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1557 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1558 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1559 if (ret) { 1560 ib_get_cached_gid(work->port->cm_dev->ib_device, 1561 work->port->port_num, 0, &work->path[0].sgid); 1562 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1563 &work->path[0].sgid, sizeof work->path[0].sgid, 1564 NULL, 0); 1565 goto rejected; 1566 } 1567 if (req_msg->alt_local_lid) { 1568 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1569 if (ret) { 1570 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1571 &work->path[0].sgid, 1572 sizeof work->path[0].sgid, NULL, 0); 1573 goto rejected; 1574 } 1575 } 1576 cm_id_priv->tid = req_msg->hdr.tid; 1577 cm_id_priv->timeout_ms = cm_convert_to_ms( 1578 cm_req_get_local_resp_timeout(req_msg)); 1579 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1580 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1581 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1582 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1583 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1584 cm_id_priv->pkey = req_msg->pkey; 1585 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1586 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1587 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1588 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1589 1590 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1591 cm_process_work(cm_id_priv, work); 1592 cm_deref_id(listen_cm_id_priv); 1593 return 0; 1594 1595rejected: 1596 atomic_dec(&cm_id_priv->refcount); 1597 cm_deref_id(listen_cm_id_priv); 1598destroy: 1599 ib_destroy_cm_id(cm_id); 1600 return ret; 1601} 1602 1603static void cm_format_rep(struct cm_rep_msg *rep_msg, 1604 struct cm_id_private *cm_id_priv, 1605 struct ib_cm_rep_param *param) 1606{ 1607 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1608 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1609 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1610 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1611 rep_msg->resp_resources = param->responder_resources; 1612 cm_rep_set_target_ack_delay(rep_msg, 1613 cm_id_priv->av.port->cm_dev->ack_delay); 1614 cm_rep_set_failover(rep_msg, param->failover_accepted); 1615 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1616 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1617 1618 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1619 rep_msg->initiator_depth = param->initiator_depth; 1620 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1621 cm_rep_set_srq(rep_msg, param->srq); 1622 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1623 } else { 1624 cm_rep_set_srq(rep_msg, 1); 1625 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1626 } 1627 1628 if (param->private_data && param->private_data_len) 1629 memcpy(rep_msg->private_data, param->private_data, 1630 param->private_data_len); 1631} 1632 1633int ib_send_cm_rep(struct ib_cm_id *cm_id, 1634 struct ib_cm_rep_param *param) 1635{ 1636 struct cm_id_private *cm_id_priv; 1637 struct ib_mad_send_buf *msg; 1638 struct cm_rep_msg *rep_msg; 1639 unsigned long flags; 1640 int ret; 1641 1642 if (param->private_data && 1643 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1644 return -EINVAL; 1645 1646 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1647 spin_lock_irqsave(&cm_id_priv->lock, flags); 1648 if (cm_id->state != IB_CM_REQ_RCVD && 1649 cm_id->state != IB_CM_MRA_REQ_SENT) { 1650 ret = -EINVAL; 1651 goto out; 1652 } 1653 1654 ret = cm_alloc_msg(cm_id_priv, &msg); 1655 if (ret) 1656 goto out; 1657 1658 rep_msg = (struct cm_rep_msg *) msg->mad; 1659 cm_format_rep(rep_msg, cm_id_priv, param); 1660 msg->timeout_ms = cm_id_priv->timeout_ms; 1661 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1662 1663 ret = ib_post_send_mad(msg, NULL); 1664 if (ret) { 1665 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1666 cm_free_msg(msg); 1667 return ret; 1668 } 1669 1670 cm_id->state = IB_CM_REP_SENT; 1671 cm_id_priv->msg = msg; 1672 cm_id_priv->initiator_depth = param->initiator_depth; 1673 cm_id_priv->responder_resources = param->responder_resources; 1674 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1675 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1676 1677out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1678 return ret; 1679} 1680EXPORT_SYMBOL(ib_send_cm_rep); 1681 1682static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1683 struct cm_id_private *cm_id_priv, 1684 const void *private_data, 1685 u8 private_data_len) 1686{ 1687 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1688 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1689 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1690 1691 if (private_data && private_data_len) 1692 memcpy(rtu_msg->private_data, private_data, private_data_len); 1693} 1694 1695int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1696 const void *private_data, 1697 u8 private_data_len) 1698{ 1699 struct cm_id_private *cm_id_priv; 1700 struct ib_mad_send_buf *msg; 1701 unsigned long flags; 1702 void *data; 1703 int ret; 1704 1705 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1706 return -EINVAL; 1707 1708 data = cm_copy_private_data(private_data, private_data_len); 1709 if (IS_ERR(data)) 1710 return PTR_ERR(data); 1711 1712 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1713 spin_lock_irqsave(&cm_id_priv->lock, flags); 1714 if (cm_id->state != IB_CM_REP_RCVD && 1715 cm_id->state != IB_CM_MRA_REP_SENT) { 1716 ret = -EINVAL; 1717 goto error; 1718 } 1719 1720 ret = cm_alloc_msg(cm_id_priv, &msg); 1721 if (ret) 1722 goto error; 1723 1724 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1725 private_data, private_data_len); 1726 1727 ret = ib_post_send_mad(msg, NULL); 1728 if (ret) { 1729 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1730 cm_free_msg(msg); 1731 kfree(data); 1732 return ret; 1733 } 1734 1735 cm_id->state = IB_CM_ESTABLISHED; 1736 cm_set_private_data(cm_id_priv, data, private_data_len); 1737 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1738 return 0; 1739 1740error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1741 kfree(data); 1742 return ret; 1743} 1744EXPORT_SYMBOL(ib_send_cm_rtu); 1745 1746static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1747{ 1748 struct cm_rep_msg *rep_msg; 1749 struct ib_cm_rep_event_param *param; 1750 1751 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1752 param = &work->cm_event.param.rep_rcvd; 1753 param->remote_ca_guid = rep_msg->local_ca_guid; 1754 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1755 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1756 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1757 param->responder_resources = rep_msg->initiator_depth; 1758 param->initiator_depth = rep_msg->resp_resources; 1759 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1760 param->failover_accepted = cm_rep_get_failover(rep_msg); 1761 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1762 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1763 param->srq = cm_rep_get_srq(rep_msg); 1764 work->cm_event.private_data = &rep_msg->private_data; 1765} 1766 1767static void cm_dup_rep_handler(struct cm_work *work) 1768{ 1769 struct cm_id_private *cm_id_priv; 1770 struct cm_rep_msg *rep_msg; 1771 struct ib_mad_send_buf *msg = NULL; 1772 int ret; 1773 1774 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1775 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1776 rep_msg->local_comm_id); 1777 if (!cm_id_priv) 1778 return; 1779 1780 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1781 counter[CM_REP_COUNTER]); 1782 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1783 if (ret) 1784 goto deref; 1785 1786 spin_lock_irq(&cm_id_priv->lock); 1787 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1788 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1789 cm_id_priv->private_data, 1790 cm_id_priv->private_data_len); 1791 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1792 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1793 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1794 cm_id_priv->private_data, 1795 cm_id_priv->private_data_len); 1796 else 1797 goto unlock; 1798 spin_unlock_irq(&cm_id_priv->lock); 1799 1800 ret = ib_post_send_mad(msg, NULL); 1801 if (ret) 1802 goto free; 1803 goto deref; 1804 1805unlock: spin_unlock_irq(&cm_id_priv->lock); 1806free: cm_free_msg(msg); 1807deref: cm_deref_id(cm_id_priv); 1808} 1809 1810static int cm_rep_handler(struct cm_work *work) 1811{ 1812 struct cm_id_private *cm_id_priv; 1813 struct cm_rep_msg *rep_msg; 1814 int ret; 1815 1816 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1817 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1818 if (!cm_id_priv) { 1819 cm_dup_rep_handler(work); 1820 return -EINVAL; 1821 } 1822 1823 cm_format_rep_event(work, cm_id_priv->qp_type); 1824 1825 spin_lock_irq(&cm_id_priv->lock); 1826 switch (cm_id_priv->id.state) { 1827 case IB_CM_REQ_SENT: 1828 case IB_CM_MRA_REQ_RCVD: 1829 break; 1830 default: 1831 spin_unlock_irq(&cm_id_priv->lock); 1832 ret = -EINVAL; 1833 goto error; 1834 } 1835 1836 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1837 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1838 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1839 1840 spin_lock(&cm.lock); 1841 /* Check for duplicate REP. */ 1842 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1843 spin_unlock(&cm.lock); 1844 spin_unlock_irq(&cm_id_priv->lock); 1845 ret = -EINVAL; 1846 goto error; 1847 } 1848 /* Check for a stale connection. */ 1849 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1850 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1851 &cm.remote_id_table); 1852 cm_id_priv->timewait_info->inserted_remote_id = 0; 1853 spin_unlock(&cm.lock); 1854 spin_unlock_irq(&cm_id_priv->lock); 1855 cm_issue_rej(work->port, work->mad_recv_wc, 1856 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1857 NULL, 0); 1858 ret = -EINVAL; 1859 goto error; 1860 } 1861 spin_unlock(&cm.lock); 1862 1863 cm_id_priv->id.state = IB_CM_REP_RCVD; 1864 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1865 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1866 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1867 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1868 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1869 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1870 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1871 cm_id_priv->av.timeout = 1872 cm_ack_timeout(cm_id_priv->target_ack_delay, 1873 cm_id_priv->av.timeout - 1); 1874 cm_id_priv->alt_av.timeout = 1875 cm_ack_timeout(cm_id_priv->target_ack_delay, 1876 cm_id_priv->alt_av.timeout - 1); 1877 1878 /* todo: handle peer_to_peer */ 1879 1880 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1881 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1882 if (!ret) 1883 list_add_tail(&work->list, &cm_id_priv->work_list); 1884 spin_unlock_irq(&cm_id_priv->lock); 1885 1886 if (ret) 1887 cm_process_work(cm_id_priv, work); 1888 else 1889 cm_deref_id(cm_id_priv); 1890 return 0; 1891 1892error: 1893 cm_deref_id(cm_id_priv); 1894 return ret; 1895} 1896 1897static int cm_establish_handler(struct cm_work *work) 1898{ 1899 struct cm_id_private *cm_id_priv; 1900 int ret; 1901 1902 /* See comment in cm_establish about lookup. */ 1903 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1904 if (!cm_id_priv) 1905 return -EINVAL; 1906 1907 spin_lock_irq(&cm_id_priv->lock); 1908 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1909 spin_unlock_irq(&cm_id_priv->lock); 1910 goto out; 1911 } 1912 1913 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1914 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1915 if (!ret) 1916 list_add_tail(&work->list, &cm_id_priv->work_list); 1917 spin_unlock_irq(&cm_id_priv->lock); 1918 1919 if (ret) 1920 cm_process_work(cm_id_priv, work); 1921 else 1922 cm_deref_id(cm_id_priv); 1923 return 0; 1924out: 1925 cm_deref_id(cm_id_priv); 1926 return -EINVAL; 1927} 1928 1929static int cm_rtu_handler(struct cm_work *work) 1930{ 1931 struct cm_id_private *cm_id_priv; 1932 struct cm_rtu_msg *rtu_msg; 1933 int ret; 1934 1935 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1936 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1937 rtu_msg->local_comm_id); 1938 if (!cm_id_priv) 1939 return -EINVAL; 1940 1941 work->cm_event.private_data = &rtu_msg->private_data; 1942 1943 spin_lock_irq(&cm_id_priv->lock); 1944 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1945 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1946 spin_unlock_irq(&cm_id_priv->lock); 1947 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1948 counter[CM_RTU_COUNTER]); 1949 goto out; 1950 } 1951 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1952 1953 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1954 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1955 if (!ret) 1956 list_add_tail(&work->list, &cm_id_priv->work_list); 1957 spin_unlock_irq(&cm_id_priv->lock); 1958 1959 if (ret) 1960 cm_process_work(cm_id_priv, work); 1961 else 1962 cm_deref_id(cm_id_priv); 1963 return 0; 1964out: 1965 cm_deref_id(cm_id_priv); 1966 return -EINVAL; 1967} 1968 1969static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1970 struct cm_id_private *cm_id_priv, 1971 const void *private_data, 1972 u8 private_data_len) 1973{ 1974 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1975 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1976 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1977 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1978 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1979 1980 if (private_data && private_data_len) 1981 memcpy(dreq_msg->private_data, private_data, private_data_len); 1982} 1983 1984int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1985 const void *private_data, 1986 u8 private_data_len) 1987{ 1988 struct cm_id_private *cm_id_priv; 1989 struct ib_mad_send_buf *msg; 1990 unsigned long flags; 1991 int ret; 1992 1993 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1994 return -EINVAL; 1995 1996 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1997 spin_lock_irqsave(&cm_id_priv->lock, flags); 1998 if (cm_id->state != IB_CM_ESTABLISHED) { 1999 ret = -EINVAL; 2000 goto out; 2001 } 2002 2003 if (cm_id->lap_state == IB_CM_LAP_SENT || 2004 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2005 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2006 2007 ret = cm_alloc_msg(cm_id_priv, &msg); 2008 if (ret) { 2009 cm_enter_timewait(cm_id_priv); 2010 goto out; 2011 } 2012 2013 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2014 private_data, private_data_len); 2015 msg->timeout_ms = cm_id_priv->timeout_ms; 2016 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2017 2018 ret = ib_post_send_mad(msg, NULL); 2019 if (ret) { 2020 cm_enter_timewait(cm_id_priv); 2021 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2022 cm_free_msg(msg); 2023 return ret; 2024 } 2025 2026 cm_id->state = IB_CM_DREQ_SENT; 2027 cm_id_priv->msg = msg; 2028out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2029 return ret; 2030} 2031EXPORT_SYMBOL(ib_send_cm_dreq); 2032 2033static void cm_format_drep(struct cm_drep_msg *drep_msg, 2034 struct cm_id_private *cm_id_priv, 2035 const void *private_data, 2036 u8 private_data_len) 2037{ 2038 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2039 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2040 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2041 2042 if (private_data && private_data_len) 2043 memcpy(drep_msg->private_data, private_data, private_data_len); 2044} 2045 2046int ib_send_cm_drep(struct ib_cm_id *cm_id, 2047 const void *private_data, 2048 u8 private_data_len) 2049{ 2050 struct cm_id_private *cm_id_priv; 2051 struct ib_mad_send_buf *msg; 2052 unsigned long flags; 2053 void *data; 2054 int ret; 2055 2056 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2057 return -EINVAL; 2058 2059 data = cm_copy_private_data(private_data, private_data_len); 2060 if (IS_ERR(data)) 2061 return PTR_ERR(data); 2062 2063 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2064 spin_lock_irqsave(&cm_id_priv->lock, flags); 2065 if (cm_id->state != IB_CM_DREQ_RCVD) { 2066 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2067 kfree(data); 2068 return -EINVAL; 2069 } 2070 2071 cm_set_private_data(cm_id_priv, data, private_data_len); 2072 cm_enter_timewait(cm_id_priv); 2073 2074 ret = cm_alloc_msg(cm_id_priv, &msg); 2075 if (ret) 2076 goto out; 2077 2078 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2079 private_data, private_data_len); 2080 2081 ret = ib_post_send_mad(msg, NULL); 2082 if (ret) { 2083 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2084 cm_free_msg(msg); 2085 return ret; 2086 } 2087 2088out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2089 return ret; 2090} 2091EXPORT_SYMBOL(ib_send_cm_drep); 2092 2093static int cm_issue_drep(struct cm_port *port, 2094 struct ib_mad_recv_wc *mad_recv_wc) 2095{ 2096 struct ib_mad_send_buf *msg = NULL; 2097 struct cm_dreq_msg *dreq_msg; 2098 struct cm_drep_msg *drep_msg; 2099 int ret; 2100 2101 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2102 if (ret) 2103 return ret; 2104 2105 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2106 drep_msg = (struct cm_drep_msg *) msg->mad; 2107 2108 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2109 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2110 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2111 2112 ret = ib_post_send_mad(msg, NULL); 2113 if (ret) 2114 cm_free_msg(msg); 2115 2116 return ret; 2117} 2118 2119static int cm_dreq_handler(struct cm_work *work) 2120{ 2121 struct cm_id_private *cm_id_priv; 2122 struct cm_dreq_msg *dreq_msg; 2123 struct ib_mad_send_buf *msg = NULL; 2124 int ret; 2125 2126 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2127 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2128 dreq_msg->local_comm_id); 2129 if (!cm_id_priv) { 2130 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2131 counter[CM_DREQ_COUNTER]); 2132 cm_issue_drep(work->port, work->mad_recv_wc); 2133 return -EINVAL; 2134 } 2135 2136 work->cm_event.private_data = &dreq_msg->private_data; 2137 2138 spin_lock_irq(&cm_id_priv->lock); 2139 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2140 goto unlock; 2141 2142 switch (cm_id_priv->id.state) { 2143 case IB_CM_REP_SENT: 2144 case IB_CM_DREQ_SENT: 2145 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2146 break; 2147 case IB_CM_ESTABLISHED: 2148 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2149 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2150 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2151 break; 2152 case IB_CM_MRA_REP_RCVD: 2153 break; 2154 case IB_CM_TIMEWAIT: 2155 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2156 counter[CM_DREQ_COUNTER]); 2157 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2158 goto unlock; 2159 2160 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2161 cm_id_priv->private_data, 2162 cm_id_priv->private_data_len); 2163 spin_unlock_irq(&cm_id_priv->lock); 2164 2165 if (ib_post_send_mad(msg, NULL)) 2166 cm_free_msg(msg); 2167 goto deref; 2168 case IB_CM_DREQ_RCVD: 2169 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2170 counter[CM_DREQ_COUNTER]); 2171 goto unlock; 2172 default: 2173 goto unlock; 2174 } 2175 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2176 cm_id_priv->tid = dreq_msg->hdr.tid; 2177 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2178 if (!ret) 2179 list_add_tail(&work->list, &cm_id_priv->work_list); 2180 spin_unlock_irq(&cm_id_priv->lock); 2181 2182 if (ret) 2183 cm_process_work(cm_id_priv, work); 2184 else 2185 cm_deref_id(cm_id_priv); 2186 return 0; 2187 2188unlock: spin_unlock_irq(&cm_id_priv->lock); 2189deref: cm_deref_id(cm_id_priv); 2190 return -EINVAL; 2191} 2192 2193static int cm_drep_handler(struct cm_work *work) 2194{ 2195 struct cm_id_private *cm_id_priv; 2196 struct cm_drep_msg *drep_msg; 2197 int ret; 2198 2199 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2200 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2201 drep_msg->local_comm_id); 2202 if (!cm_id_priv) 2203 return -EINVAL; 2204 2205 work->cm_event.private_data = &drep_msg->private_data; 2206 2207 spin_lock_irq(&cm_id_priv->lock); 2208 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2209 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2210 spin_unlock_irq(&cm_id_priv->lock); 2211 goto out; 2212 } 2213 cm_enter_timewait(cm_id_priv); 2214 2215 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2216 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2217 if (!ret) 2218 list_add_tail(&work->list, &cm_id_priv->work_list); 2219 spin_unlock_irq(&cm_id_priv->lock); 2220 2221 if (ret) 2222 cm_process_work(cm_id_priv, work); 2223 else 2224 cm_deref_id(cm_id_priv); 2225 return 0; 2226out: 2227 cm_deref_id(cm_id_priv); 2228 return -EINVAL; 2229} 2230 2231int ib_send_cm_rej(struct ib_cm_id *cm_id, 2232 enum ib_cm_rej_reason reason, 2233 void *ari, 2234 u8 ari_length, 2235 const void *private_data, 2236 u8 private_data_len) 2237{ 2238 struct cm_id_private *cm_id_priv; 2239 struct ib_mad_send_buf *msg; 2240 unsigned long flags; 2241 int ret; 2242 2243 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2244 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2245 return -EINVAL; 2246 2247 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2248 2249 spin_lock_irqsave(&cm_id_priv->lock, flags); 2250 switch (cm_id->state) { 2251 case IB_CM_REQ_SENT: 2252 case IB_CM_MRA_REQ_RCVD: 2253 case IB_CM_REQ_RCVD: 2254 case IB_CM_MRA_REQ_SENT: 2255 case IB_CM_REP_RCVD: 2256 case IB_CM_MRA_REP_SENT: 2257 ret = cm_alloc_msg(cm_id_priv, &msg); 2258 if (!ret) 2259 cm_format_rej((struct cm_rej_msg *) msg->mad, 2260 cm_id_priv, reason, ari, ari_length, 2261 private_data, private_data_len); 2262 2263 cm_reset_to_idle(cm_id_priv); 2264 break; 2265 case IB_CM_REP_SENT: 2266 case IB_CM_MRA_REP_RCVD: 2267 ret = cm_alloc_msg(cm_id_priv, &msg); 2268 if (!ret) 2269 cm_format_rej((struct cm_rej_msg *) msg->mad, 2270 cm_id_priv, reason, ari, ari_length, 2271 private_data, private_data_len); 2272 2273 cm_enter_timewait(cm_id_priv); 2274 break; 2275 default: 2276 ret = -EINVAL; 2277 goto out; 2278 } 2279 2280 if (ret) 2281 goto out; 2282 2283 ret = ib_post_send_mad(msg, NULL); 2284 if (ret) 2285 cm_free_msg(msg); 2286 2287out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2288 return ret; 2289} 2290EXPORT_SYMBOL(ib_send_cm_rej); 2291 2292static void cm_format_rej_event(struct cm_work *work) 2293{ 2294 struct cm_rej_msg *rej_msg; 2295 struct ib_cm_rej_event_param *param; 2296 2297 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2298 param = &work->cm_event.param.rej_rcvd; 2299 param->ari = rej_msg->ari; 2300 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2301 param->reason = __be16_to_cpu(rej_msg->reason); 2302 work->cm_event.private_data = &rej_msg->private_data; 2303} 2304 2305static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2306{ 2307 struct cm_timewait_info *timewait_info; 2308 struct cm_id_private *cm_id_priv; 2309 __be32 remote_id; 2310 2311 remote_id = rej_msg->local_comm_id; 2312 2313 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2314 spin_lock_irq(&cm.lock); 2315 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2316 remote_id); 2317 if (!timewait_info) { 2318 spin_unlock_irq(&cm.lock); 2319 return NULL; 2320 } 2321 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2322 (timewait_info->work.local_id ^ 2323 cm.random_id_operand)); 2324 if (cm_id_priv) { 2325 if (cm_id_priv->id.remote_id == remote_id) 2326 atomic_inc(&cm_id_priv->refcount); 2327 else 2328 cm_id_priv = NULL; 2329 } 2330 spin_unlock_irq(&cm.lock); 2331 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2332 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2333 else 2334 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2335 2336 return cm_id_priv; 2337} 2338 2339static int cm_rej_handler(struct cm_work *work) 2340{ 2341 struct cm_id_private *cm_id_priv; 2342 struct cm_rej_msg *rej_msg; 2343 int ret; 2344 2345 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2346 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2347 if (!cm_id_priv) 2348 return -EINVAL; 2349 2350 cm_format_rej_event(work); 2351 2352 spin_lock_irq(&cm_id_priv->lock); 2353 switch (cm_id_priv->id.state) { 2354 case IB_CM_REQ_SENT: 2355 case IB_CM_MRA_REQ_RCVD: 2356 case IB_CM_REP_SENT: 2357 case IB_CM_MRA_REP_RCVD: 2358 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2359 /* fall through */ 2360 case IB_CM_REQ_RCVD: 2361 case IB_CM_MRA_REQ_SENT: 2362 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2363 cm_enter_timewait(cm_id_priv); 2364 else 2365 cm_reset_to_idle(cm_id_priv); 2366 break; 2367 case IB_CM_DREQ_SENT: 2368 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2369 /* fall through */ 2370 case IB_CM_REP_RCVD: 2371 case IB_CM_MRA_REP_SENT: 2372 cm_enter_timewait(cm_id_priv); 2373 break; 2374 case IB_CM_ESTABLISHED: 2375 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2376 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2377 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2378 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2379 cm_id_priv->msg); 2380 cm_enter_timewait(cm_id_priv); 2381 break; 2382 } 2383 /* fall through */ 2384 default: 2385 spin_unlock_irq(&cm_id_priv->lock); 2386 ret = -EINVAL; 2387 goto out; 2388 } 2389 2390 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2391 if (!ret) 2392 list_add_tail(&work->list, &cm_id_priv->work_list); 2393 spin_unlock_irq(&cm_id_priv->lock); 2394 2395 if (ret) 2396 cm_process_work(cm_id_priv, work); 2397 else 2398 cm_deref_id(cm_id_priv); 2399 return 0; 2400out: 2401 cm_deref_id(cm_id_priv); 2402 return -EINVAL; 2403} 2404 2405int ib_send_cm_mra(struct ib_cm_id *cm_id, 2406 u8 service_timeout, 2407 const void *private_data, 2408 u8 private_data_len) 2409{ 2410 struct cm_id_private *cm_id_priv; 2411 struct ib_mad_send_buf *msg; 2412 enum ib_cm_state cm_state; 2413 enum ib_cm_lap_state lap_state; 2414 enum cm_msg_response msg_response; 2415 void *data; 2416 unsigned long flags; 2417 int ret; 2418 2419 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2420 return -EINVAL; 2421 2422 data = cm_copy_private_data(private_data, private_data_len); 2423 if (IS_ERR(data)) 2424 return PTR_ERR(data); 2425 2426 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2427 2428 spin_lock_irqsave(&cm_id_priv->lock, flags); 2429 switch(cm_id_priv->id.state) { 2430 case IB_CM_REQ_RCVD: 2431 cm_state = IB_CM_MRA_REQ_SENT; 2432 lap_state = cm_id->lap_state; 2433 msg_response = CM_MSG_RESPONSE_REQ; 2434 break; 2435 case IB_CM_REP_RCVD: 2436 cm_state = IB_CM_MRA_REP_SENT; 2437 lap_state = cm_id->lap_state; 2438 msg_response = CM_MSG_RESPONSE_REP; 2439 break; 2440 case IB_CM_ESTABLISHED: 2441 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2442 cm_state = cm_id->state; 2443 lap_state = IB_CM_MRA_LAP_SENT; 2444 msg_response = CM_MSG_RESPONSE_OTHER; 2445 break; 2446 } 2447 default: 2448 ret = -EINVAL; 2449 goto error1; 2450 } 2451 2452 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2453 ret = cm_alloc_msg(cm_id_priv, &msg); 2454 if (ret) 2455 goto error1; 2456 2457 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2458 msg_response, service_timeout, 2459 private_data, private_data_len); 2460 ret = ib_post_send_mad(msg, NULL); 2461 if (ret) 2462 goto error2; 2463 } 2464 2465 cm_id->state = cm_state; 2466 cm_id->lap_state = lap_state; 2467 cm_id_priv->service_timeout = service_timeout; 2468 cm_set_private_data(cm_id_priv, data, private_data_len); 2469 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2470 return 0; 2471 2472error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2473 kfree(data); 2474 return ret; 2475 2476error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2477 kfree(data); 2478 cm_free_msg(msg); 2479 return ret; 2480} 2481EXPORT_SYMBOL(ib_send_cm_mra); 2482 2483static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2484{ 2485 switch (cm_mra_get_msg_mraed(mra_msg)) { 2486 case CM_MSG_RESPONSE_REQ: 2487 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2488 case CM_MSG_RESPONSE_REP: 2489 case CM_MSG_RESPONSE_OTHER: 2490 return cm_acquire_id(mra_msg->remote_comm_id, 2491 mra_msg->local_comm_id); 2492 default: 2493 return NULL; 2494 } 2495} 2496 2497static int cm_mra_handler(struct cm_work *work) 2498{ 2499 struct cm_id_private *cm_id_priv; 2500 struct cm_mra_msg *mra_msg; 2501 int timeout, ret; 2502 2503 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2504 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2505 if (!cm_id_priv) 2506 return -EINVAL; 2507 2508 work->cm_event.private_data = &mra_msg->private_data; 2509 work->cm_event.param.mra_rcvd.service_timeout = 2510 cm_mra_get_service_timeout(mra_msg); 2511 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2512 cm_convert_to_ms(cm_id_priv->av.timeout); 2513 2514 spin_lock_irq(&cm_id_priv->lock); 2515 switch (cm_id_priv->id.state) { 2516 case IB_CM_REQ_SENT: 2517 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2518 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2519 cm_id_priv->msg, timeout)) 2520 goto out; 2521 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2522 break; 2523 case IB_CM_REP_SENT: 2524 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2525 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2526 cm_id_priv->msg, timeout)) 2527 goto out; 2528 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2529 break; 2530 case IB_CM_ESTABLISHED: 2531 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2532 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2533 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2534 cm_id_priv->msg, timeout)) { 2535 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2536 atomic_long_inc(&work->port-> 2537 counter_group[CM_RECV_DUPLICATES]. 2538 counter[CM_MRA_COUNTER]); 2539 goto out; 2540 } 2541 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2542 break; 2543 case IB_CM_MRA_REQ_RCVD: 2544 case IB_CM_MRA_REP_RCVD: 2545 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2546 counter[CM_MRA_COUNTER]); 2547 /* fall through */ 2548 default: 2549 goto out; 2550 } 2551 2552 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2553 cm_id_priv->id.state; 2554 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2555 if (!ret) 2556 list_add_tail(&work->list, &cm_id_priv->work_list); 2557 spin_unlock_irq(&cm_id_priv->lock); 2558 2559 if (ret) 2560 cm_process_work(cm_id_priv, work); 2561 else 2562 cm_deref_id(cm_id_priv); 2563 return 0; 2564out: 2565 spin_unlock_irq(&cm_id_priv->lock); 2566 cm_deref_id(cm_id_priv); 2567 return -EINVAL; 2568} 2569 2570static void cm_format_lap(struct cm_lap_msg *lap_msg, 2571 struct cm_id_private *cm_id_priv, 2572 struct ib_sa_path_rec *alternate_path, 2573 const void *private_data, 2574 u8 private_data_len) 2575{ 2576 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2577 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2578 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2579 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2580 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2581 /* todo: need remote CM response timeout */ 2582 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2583 lap_msg->alt_local_lid = alternate_path->slid; 2584 lap_msg->alt_remote_lid = alternate_path->dlid; 2585 lap_msg->alt_local_gid = alternate_path->sgid; 2586 lap_msg->alt_remote_gid = alternate_path->dgid; 2587 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2588 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2589 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2590 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2591 cm_lap_set_sl(lap_msg, alternate_path->sl); 2592 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2593 cm_lap_set_local_ack_timeout(lap_msg, 2594 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2595 alternate_path->packet_life_time)); 2596 2597 if (private_data && private_data_len) 2598 memcpy(lap_msg->private_data, private_data, private_data_len); 2599} 2600 2601int ib_send_cm_lap(struct ib_cm_id *cm_id, 2602 struct ib_sa_path_rec *alternate_path, 2603 const void *private_data, 2604 u8 private_data_len) 2605{ 2606 struct cm_id_private *cm_id_priv; 2607 struct ib_mad_send_buf *msg; 2608 unsigned long flags; 2609 int ret; 2610 2611 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2612 return -EINVAL; 2613 2614 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2615 spin_lock_irqsave(&cm_id_priv->lock, flags); 2616 if (cm_id->state != IB_CM_ESTABLISHED || 2617 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2618 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2619 ret = -EINVAL; 2620 goto out; 2621 } 2622 2623 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2624 if (ret) 2625 goto out; 2626 cm_id_priv->alt_av.timeout = 2627 cm_ack_timeout(cm_id_priv->target_ack_delay, 2628 cm_id_priv->alt_av.timeout - 1); 2629 2630 ret = cm_alloc_msg(cm_id_priv, &msg); 2631 if (ret) 2632 goto out; 2633 2634 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2635 alternate_path, private_data, private_data_len); 2636 msg->timeout_ms = cm_id_priv->timeout_ms; 2637 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2638 2639 ret = ib_post_send_mad(msg, NULL); 2640 if (ret) { 2641 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2642 cm_free_msg(msg); 2643 return ret; 2644 } 2645 2646 cm_id->lap_state = IB_CM_LAP_SENT; 2647 cm_id_priv->msg = msg; 2648 2649out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2650 return ret; 2651} 2652EXPORT_SYMBOL(ib_send_cm_lap); 2653 2654static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2655 struct ib_sa_path_rec *path, 2656 struct cm_lap_msg *lap_msg) 2657{ 2658 memset(path, 0, sizeof *path); 2659 path->dgid = lap_msg->alt_local_gid; 2660 path->sgid = lap_msg->alt_remote_gid; 2661 path->dlid = lap_msg->alt_local_lid; 2662 path->slid = lap_msg->alt_remote_lid; 2663 path->flow_label = cm_lap_get_flow_label(lap_msg); 2664 path->hop_limit = lap_msg->alt_hop_limit; 2665 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2666 path->reversible = 1; 2667 path->pkey = cm_id_priv->pkey; 2668 path->sl = cm_lap_get_sl(lap_msg); 2669 path->mtu_selector = IB_SA_EQ; 2670 path->mtu = cm_id_priv->path_mtu; 2671 path->rate_selector = IB_SA_EQ; 2672 path->rate = cm_lap_get_packet_rate(lap_msg); 2673 path->packet_life_time_selector = IB_SA_EQ; 2674 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2675 path->packet_life_time -= (path->packet_life_time > 0); 2676} 2677 2678static int cm_lap_handler(struct cm_work *work) 2679{ 2680 struct cm_id_private *cm_id_priv; 2681 struct cm_lap_msg *lap_msg; 2682 struct ib_cm_lap_event_param *param; 2683 struct ib_mad_send_buf *msg = NULL; 2684 int ret; 2685 2686 /* todo: verify LAP request and send reject APR if invalid. */ 2687 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2688 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2689 lap_msg->local_comm_id); 2690 if (!cm_id_priv) 2691 return -EINVAL; 2692 2693 param = &work->cm_event.param.lap_rcvd; 2694 param->alternate_path = &work->path[0]; 2695 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2696 work->cm_event.private_data = &lap_msg->private_data; 2697 2698 spin_lock_irq(&cm_id_priv->lock); 2699 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2700 goto unlock; 2701 2702 switch (cm_id_priv->id.lap_state) { 2703 case IB_CM_LAP_UNINIT: 2704 case IB_CM_LAP_IDLE: 2705 break; 2706 case IB_CM_MRA_LAP_SENT: 2707 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2708 counter[CM_LAP_COUNTER]); 2709 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2710 goto unlock; 2711 2712 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2713 CM_MSG_RESPONSE_OTHER, 2714 cm_id_priv->service_timeout, 2715 cm_id_priv->private_data, 2716 cm_id_priv->private_data_len); 2717 spin_unlock_irq(&cm_id_priv->lock); 2718 2719 if (ib_post_send_mad(msg, NULL)) 2720 cm_free_msg(msg); 2721 goto deref; 2722 case IB_CM_LAP_RCVD: 2723 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2724 counter[CM_LAP_COUNTER]); 2725 goto unlock; 2726 default: 2727 goto unlock; 2728 } 2729 2730 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2731 cm_id_priv->tid = lap_msg->hdr.tid; 2732 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2733 work->mad_recv_wc->recv_buf.grh, 2734 &cm_id_priv->av); 2735 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2736 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2737 if (!ret) 2738 list_add_tail(&work->list, &cm_id_priv->work_list); 2739 spin_unlock_irq(&cm_id_priv->lock); 2740 2741 if (ret) 2742 cm_process_work(cm_id_priv, work); 2743 else 2744 cm_deref_id(cm_id_priv); 2745 return 0; 2746 2747unlock: spin_unlock_irq(&cm_id_priv->lock); 2748deref: cm_deref_id(cm_id_priv); 2749 return -EINVAL; 2750} 2751 2752static void cm_format_apr(struct cm_apr_msg *apr_msg, 2753 struct cm_id_private *cm_id_priv, 2754 enum ib_cm_apr_status status, 2755 void *info, 2756 u8 info_length, 2757 const void *private_data, 2758 u8 private_data_len) 2759{ 2760 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2761 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2762 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2763 apr_msg->ap_status = (u8) status; 2764 2765 if (info && info_length) { 2766 apr_msg->info_length = info_length; 2767 memcpy(apr_msg->info, info, info_length); 2768 } 2769 2770 if (private_data && private_data_len) 2771 memcpy(apr_msg->private_data, private_data, private_data_len); 2772} 2773 2774int ib_send_cm_apr(struct ib_cm_id *cm_id, 2775 enum ib_cm_apr_status status, 2776 void *info, 2777 u8 info_length, 2778 const void *private_data, 2779 u8 private_data_len) 2780{ 2781 struct cm_id_private *cm_id_priv; 2782 struct ib_mad_send_buf *msg; 2783 unsigned long flags; 2784 int ret; 2785 2786 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2787 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2788 return -EINVAL; 2789 2790 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2791 spin_lock_irqsave(&cm_id_priv->lock, flags); 2792 if (cm_id->state != IB_CM_ESTABLISHED || 2793 (cm_id->lap_state != IB_CM_LAP_RCVD && 2794 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2795 ret = -EINVAL; 2796 goto out; 2797 } 2798 2799 ret = cm_alloc_msg(cm_id_priv, &msg); 2800 if (ret) 2801 goto out; 2802 2803 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2804 info, info_length, private_data, private_data_len); 2805 ret = ib_post_send_mad(msg, NULL); 2806 if (ret) { 2807 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2808 cm_free_msg(msg); 2809 return ret; 2810 } 2811 2812 cm_id->lap_state = IB_CM_LAP_IDLE; 2813out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2814 return ret; 2815} 2816EXPORT_SYMBOL(ib_send_cm_apr); 2817 2818static int cm_apr_handler(struct cm_work *work) 2819{ 2820 struct cm_id_private *cm_id_priv; 2821 struct cm_apr_msg *apr_msg; 2822 int ret; 2823 2824 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2825 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2826 apr_msg->local_comm_id); 2827 if (!cm_id_priv) 2828 return -EINVAL; /* Unmatched reply. */ 2829 2830 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2831 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2832 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2833 work->cm_event.private_data = &apr_msg->private_data; 2834 2835 spin_lock_irq(&cm_id_priv->lock); 2836 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2837 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2838 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2839 spin_unlock_irq(&cm_id_priv->lock); 2840 goto out; 2841 } 2842 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2843 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2844 cm_id_priv->msg = NULL; 2845 2846 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2847 if (!ret) 2848 list_add_tail(&work->list, &cm_id_priv->work_list); 2849 spin_unlock_irq(&cm_id_priv->lock); 2850 2851 if (ret) 2852 cm_process_work(cm_id_priv, work); 2853 else 2854 cm_deref_id(cm_id_priv); 2855 return 0; 2856out: 2857 cm_deref_id(cm_id_priv); 2858 return -EINVAL; 2859} 2860 2861static int cm_timewait_handler(struct cm_work *work) 2862{ 2863 struct cm_timewait_info *timewait_info; 2864 struct cm_id_private *cm_id_priv; 2865 int ret; 2866 2867 timewait_info = (struct cm_timewait_info *)work; 2868 spin_lock_irq(&cm.lock); 2869 list_del(&timewait_info->list); 2870 spin_unlock_irq(&cm.lock); 2871 2872 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2873 timewait_info->work.remote_id); 2874 if (!cm_id_priv) 2875 return -EINVAL; 2876 2877 spin_lock_irq(&cm_id_priv->lock); 2878 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2879 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2880 spin_unlock_irq(&cm_id_priv->lock); 2881 goto out; 2882 } 2883 cm_id_priv->id.state = IB_CM_IDLE; 2884 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2885 if (!ret) 2886 list_add_tail(&work->list, &cm_id_priv->work_list); 2887 spin_unlock_irq(&cm_id_priv->lock); 2888 2889 if (ret) 2890 cm_process_work(cm_id_priv, work); 2891 else 2892 cm_deref_id(cm_id_priv); 2893 return 0; 2894out: 2895 cm_deref_id(cm_id_priv); 2896 return -EINVAL; 2897} 2898 2899static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2900 struct cm_id_private *cm_id_priv, 2901 struct ib_cm_sidr_req_param *param) 2902{ 2903 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2904 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2905 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2906 sidr_req_msg->pkey = param->path->pkey; 2907 sidr_req_msg->service_id = param->service_id; 2908 2909 if (param->private_data && param->private_data_len) 2910 memcpy(sidr_req_msg->private_data, param->private_data, 2911 param->private_data_len); 2912} 2913 2914int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2915 struct ib_cm_sidr_req_param *param) 2916{ 2917 struct cm_id_private *cm_id_priv; 2918 struct ib_mad_send_buf *msg; 2919 unsigned long flags; 2920 int ret; 2921 2922 if (!param->path || (param->private_data && 2923 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2924 return -EINVAL; 2925 2926 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2927 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2928 if (ret) 2929 goto out; 2930 2931 cm_id->service_id = param->service_id; 2932 cm_id->service_mask = ~cpu_to_be64(0); 2933 cm_id_priv->timeout_ms = param->timeout_ms; 2934 cm_id_priv->max_cm_retries = param->max_cm_retries; 2935 ret = cm_alloc_msg(cm_id_priv, &msg); 2936 if (ret) 2937 goto out; 2938 2939 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2940 param); 2941 msg->timeout_ms = cm_id_priv->timeout_ms; 2942 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2943 2944 spin_lock_irqsave(&cm_id_priv->lock, flags); 2945 if (cm_id->state == IB_CM_IDLE) 2946 ret = ib_post_send_mad(msg, NULL); 2947 else 2948 ret = -EINVAL; 2949 2950 if (ret) { 2951 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2952 cm_free_msg(msg); 2953 goto out; 2954 } 2955 cm_id->state = IB_CM_SIDR_REQ_SENT; 2956 cm_id_priv->msg = msg; 2957 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2958out: 2959 return ret; 2960} 2961EXPORT_SYMBOL(ib_send_cm_sidr_req); 2962 2963static void cm_format_sidr_req_event(struct cm_work *work, 2964 struct ib_cm_id *listen_id) 2965{ 2966 struct cm_sidr_req_msg *sidr_req_msg; 2967 struct ib_cm_sidr_req_event_param *param; 2968 2969 sidr_req_msg = (struct cm_sidr_req_msg *) 2970 work->mad_recv_wc->recv_buf.mad; 2971 param = &work->cm_event.param.sidr_req_rcvd; 2972 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2973 param->listen_id = listen_id; 2974 param->port = work->port->port_num; 2975 work->cm_event.private_data = &sidr_req_msg->private_data; 2976} 2977 2978static int cm_sidr_req_handler(struct cm_work *work) 2979{ 2980 struct ib_cm_id *cm_id; 2981 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2982 struct cm_sidr_req_msg *sidr_req_msg; 2983 struct ib_wc *wc; 2984 2985 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2986 if (IS_ERR(cm_id)) 2987 return PTR_ERR(cm_id); 2988 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2989 2990 /* Record SGID/SLID and request ID for lookup. */ 2991 sidr_req_msg = (struct cm_sidr_req_msg *) 2992 work->mad_recv_wc->recv_buf.mad; 2993 wc = work->mad_recv_wc->wc; 2994 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2995 cm_id_priv->av.dgid.global.interface_id = 0; 2996 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2997 work->mad_recv_wc->recv_buf.grh, 2998 &cm_id_priv->av); 2999 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3000 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3001 atomic_inc(&cm_id_priv->work_count); 3002 3003 spin_lock_irq(&cm.lock); 3004 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3005 if (cur_cm_id_priv) { 3006 spin_unlock_irq(&cm.lock); 3007 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3008 counter[CM_SIDR_REQ_COUNTER]); 3009 goto out; /* Duplicate message. */ 3010 } 3011 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3012 cur_cm_id_priv = cm_find_listen(cm_id->device, 3013 sidr_req_msg->service_id, 3014 sidr_req_msg->private_data); 3015 if (!cur_cm_id_priv) { 3016 spin_unlock_irq(&cm.lock); 3017 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3018 goto out; /* No match. */ 3019 } 3020 atomic_inc(&cur_cm_id_priv->refcount); 3021 atomic_inc(&cm_id_priv->refcount); 3022 spin_unlock_irq(&cm.lock); 3023 3024 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3025 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3026 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3027 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3028 3029 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3030 cm_process_work(cm_id_priv, work); 3031 cm_deref_id(cur_cm_id_priv); 3032 return 0; 3033out: 3034 ib_destroy_cm_id(&cm_id_priv->id); 3035 return -EINVAL; 3036} 3037 3038static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3039 struct cm_id_private *cm_id_priv, 3040 struct ib_cm_sidr_rep_param *param) 3041{ 3042 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3043 cm_id_priv->tid); 3044 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3045 sidr_rep_msg->status = param->status; 3046 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3047 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3048 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3049 3050 if (param->info && param->info_length) 3051 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3052 3053 if (param->private_data && param->private_data_len) 3054 memcpy(sidr_rep_msg->private_data, param->private_data, 3055 param->private_data_len); 3056} 3057 3058int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3059 struct ib_cm_sidr_rep_param *param) 3060{ 3061 struct cm_id_private *cm_id_priv; 3062 struct ib_mad_send_buf *msg; 3063 unsigned long flags; 3064 int ret; 3065 3066 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3067 (param->private_data && 3068 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3069 return -EINVAL; 3070 3071 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3072 spin_lock_irqsave(&cm_id_priv->lock, flags); 3073 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3074 ret = -EINVAL; 3075 goto error; 3076 } 3077 3078 ret = cm_alloc_msg(cm_id_priv, &msg); 3079 if (ret) 3080 goto error; 3081 3082 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3083 param); 3084 ret = ib_post_send_mad(msg, NULL); 3085 if (ret) { 3086 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3087 cm_free_msg(msg); 3088 return ret; 3089 } 3090 cm_id->state = IB_CM_IDLE; 3091 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3092 3093 spin_lock_irqsave(&cm.lock, flags); 3094 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3095 spin_unlock_irqrestore(&cm.lock, flags); 3096 return 0; 3097 3098error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3099 return ret; 3100} 3101EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3102 3103static void cm_format_sidr_rep_event(struct cm_work *work) 3104{ 3105 struct cm_sidr_rep_msg *sidr_rep_msg; 3106 struct ib_cm_sidr_rep_event_param *param; 3107 3108 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3109 work->mad_recv_wc->recv_buf.mad; 3110 param = &work->cm_event.param.sidr_rep_rcvd; 3111 param->status = sidr_rep_msg->status; 3112 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3113 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3114 param->info = &sidr_rep_msg->info; 3115 param->info_len = sidr_rep_msg->info_length; 3116 work->cm_event.private_data = &sidr_rep_msg->private_data; 3117} 3118 3119static int cm_sidr_rep_handler(struct cm_work *work) 3120{ 3121 struct cm_sidr_rep_msg *sidr_rep_msg; 3122 struct cm_id_private *cm_id_priv; 3123 3124 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3125 work->mad_recv_wc->recv_buf.mad; 3126 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3127 if (!cm_id_priv) 3128 return -EINVAL; /* Unmatched reply. */ 3129 3130 spin_lock_irq(&cm_id_priv->lock); 3131 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3132 spin_unlock_irq(&cm_id_priv->lock); 3133 goto out; 3134 } 3135 cm_id_priv->id.state = IB_CM_IDLE; 3136 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3137 spin_unlock_irq(&cm_id_priv->lock); 3138 3139 cm_format_sidr_rep_event(work); 3140 cm_process_work(cm_id_priv, work); 3141 return 0; 3142out: 3143 cm_deref_id(cm_id_priv); 3144 return -EINVAL; 3145} 3146 3147static void cm_process_send_error(struct ib_mad_send_buf *msg, 3148 enum ib_wc_status wc_status) 3149{ 3150 struct cm_id_private *cm_id_priv; 3151 struct ib_cm_event cm_event; 3152 enum ib_cm_state state; 3153 int ret; 3154 3155 memset(&cm_event, 0, sizeof cm_event); 3156 cm_id_priv = msg->context[0]; 3157 3158 /* Discard old sends or ones without a response. */ 3159 spin_lock_irq(&cm_id_priv->lock); 3160 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3161 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3162 goto discard; 3163 3164 switch (state) { 3165 case IB_CM_REQ_SENT: 3166 case IB_CM_MRA_REQ_RCVD: 3167 cm_reset_to_idle(cm_id_priv); 3168 cm_event.event = IB_CM_REQ_ERROR; 3169 break; 3170 case IB_CM_REP_SENT: 3171 case IB_CM_MRA_REP_RCVD: 3172 cm_reset_to_idle(cm_id_priv); 3173 cm_event.event = IB_CM_REP_ERROR; 3174 break; 3175 case IB_CM_DREQ_SENT: 3176 cm_enter_timewait(cm_id_priv); 3177 cm_event.event = IB_CM_DREQ_ERROR; 3178 break; 3179 case IB_CM_SIDR_REQ_SENT: 3180 cm_id_priv->id.state = IB_CM_IDLE; 3181 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3182 break; 3183 default: 3184 goto discard; 3185 } 3186 spin_unlock_irq(&cm_id_priv->lock); 3187 cm_event.param.send_status = wc_status; 3188 3189 /* No other events can occur on the cm_id at this point. */ 3190 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3191 cm_free_msg(msg); 3192 if (ret) 3193 ib_destroy_cm_id(&cm_id_priv->id); 3194 return; 3195discard: 3196 spin_unlock_irq(&cm_id_priv->lock); 3197 cm_free_msg(msg); 3198} 3199 3200static void cm_send_handler(struct ib_mad_agent *mad_agent, 3201 struct ib_mad_send_wc *mad_send_wc) 3202{ 3203 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3204 struct cm_port *port; 3205 u16 attr_index; 3206 3207 port = mad_agent->context; 3208 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3209 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3210 3211 /* 3212 * If the send was in response to a received message (context[0] is not 3213 * set to a cm_id), and is not a REJ, then it is a send that was 3214 * manually retried. 3215 */ 3216 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3217 msg->retries = 1; 3218 3219 atomic_long_add(1 + msg->retries, 3220 &port->counter_group[CM_XMIT].counter[attr_index]); 3221 if (msg->retries) 3222 atomic_long_add(msg->retries, 3223 &port->counter_group[CM_XMIT_RETRIES]. 3224 counter[attr_index]); 3225 3226 switch (mad_send_wc->status) { 3227 case IB_WC_SUCCESS: 3228 case IB_WC_WR_FLUSH_ERR: 3229 cm_free_msg(msg); 3230 break; 3231 default: 3232 if (msg->context[0] && msg->context[1]) 3233 cm_process_send_error(msg, mad_send_wc->status); 3234 else 3235 cm_free_msg(msg); 3236 break; 3237 } 3238} 3239 3240static void cm_work_handler(struct work_struct *_work) 3241{ 3242 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3243 int ret; 3244 3245 switch (work->cm_event.event) { 3246 case IB_CM_REQ_RECEIVED: 3247 ret = cm_req_handler(work); 3248 break; 3249 case IB_CM_MRA_RECEIVED: 3250 ret = cm_mra_handler(work); 3251 break; 3252 case IB_CM_REJ_RECEIVED: 3253 ret = cm_rej_handler(work); 3254 break; 3255 case IB_CM_REP_RECEIVED: 3256 ret = cm_rep_handler(work); 3257 break; 3258 case IB_CM_RTU_RECEIVED: 3259 ret = cm_rtu_handler(work); 3260 break; 3261 case IB_CM_USER_ESTABLISHED: 3262 ret = cm_establish_handler(work); 3263 break; 3264 case IB_CM_DREQ_RECEIVED: 3265 ret = cm_dreq_handler(work); 3266 break; 3267 case IB_CM_DREP_RECEIVED: 3268 ret = cm_drep_handler(work); 3269 break; 3270 case IB_CM_SIDR_REQ_RECEIVED: 3271 ret = cm_sidr_req_handler(work); 3272 break; 3273 case IB_CM_SIDR_REP_RECEIVED: 3274 ret = cm_sidr_rep_handler(work); 3275 break; 3276 case IB_CM_LAP_RECEIVED: 3277 ret = cm_lap_handler(work); 3278 break; 3279 case IB_CM_APR_RECEIVED: 3280 ret = cm_apr_handler(work); 3281 break; 3282 case IB_CM_TIMEWAIT_EXIT: 3283 ret = cm_timewait_handler(work); 3284 break; 3285 default: 3286 ret = -EINVAL; 3287 break; 3288 } 3289 if (ret) 3290 cm_free_work(work); 3291} 3292 3293static int cm_establish(struct ib_cm_id *cm_id) 3294{ 3295 struct cm_id_private *cm_id_priv; 3296 struct cm_work *work; 3297 unsigned long flags; 3298 int ret = 0; 3299 3300 work = kmalloc(sizeof *work, GFP_ATOMIC); 3301 if (!work) 3302 return -ENOMEM; 3303 3304 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3305 spin_lock_irqsave(&cm_id_priv->lock, flags); 3306 switch (cm_id->state) 3307 { 3308 case IB_CM_REP_SENT: 3309 case IB_CM_MRA_REP_RCVD: 3310 cm_id->state = IB_CM_ESTABLISHED; 3311 break; 3312 case IB_CM_ESTABLISHED: 3313 ret = -EISCONN; 3314 break; 3315 default: 3316 ret = -EINVAL; 3317 break; 3318 } 3319 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3320 3321 if (ret) { 3322 kfree(work); 3323 goto out; 3324 } 3325 3326 /* 3327 * The CM worker thread may try to destroy the cm_id before it 3328 * can execute this work item. To prevent potential deadlock, 3329 * we need to find the cm_id once we're in the context of the 3330 * worker thread, rather than holding a reference on it. 3331 */ 3332 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3333 work->local_id = cm_id->local_id; 3334 work->remote_id = cm_id->remote_id; 3335 work->mad_recv_wc = NULL; 3336 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3337 queue_delayed_work(cm.wq, &work->work, 0); 3338out: 3339 return ret; 3340} 3341 3342static int cm_migrate(struct ib_cm_id *cm_id) 3343{ 3344 struct cm_id_private *cm_id_priv; 3345 unsigned long flags; 3346 int ret = 0; 3347 3348 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3349 spin_lock_irqsave(&cm_id_priv->lock, flags); 3350 if (cm_id->state == IB_CM_ESTABLISHED && 3351 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3352 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3353 cm_id->lap_state = IB_CM_LAP_IDLE; 3354 cm_id_priv->av = cm_id_priv->alt_av; 3355 } else 3356 ret = -EINVAL; 3357 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3358 3359 return ret; 3360} 3361 3362int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3363{ 3364 int ret; 3365 3366 switch (event) { 3367 case IB_EVENT_COMM_EST: 3368 ret = cm_establish(cm_id); 3369 break; 3370 case IB_EVENT_PATH_MIG: 3371 ret = cm_migrate(cm_id); 3372 break; 3373 default: 3374 ret = -EINVAL; 3375 } 3376 return ret; 3377} 3378EXPORT_SYMBOL(ib_cm_notify); 3379 3380static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3381 struct ib_mad_recv_wc *mad_recv_wc) 3382{ 3383 struct cm_port *port = mad_agent->context; 3384 struct cm_work *work; 3385 enum ib_cm_event_type event; 3386 u16 attr_id; 3387 int paths = 0; 3388 3389 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3390 case CM_REQ_ATTR_ID: 3391 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3392 alt_local_lid != 0); 3393 event = IB_CM_REQ_RECEIVED; 3394 break; 3395 case CM_MRA_ATTR_ID: 3396 event = IB_CM_MRA_RECEIVED; 3397 break; 3398 case CM_REJ_ATTR_ID: 3399 event = IB_CM_REJ_RECEIVED; 3400 break; 3401 case CM_REP_ATTR_ID: 3402 event = IB_CM_REP_RECEIVED; 3403 break; 3404 case CM_RTU_ATTR_ID: 3405 event = IB_CM_RTU_RECEIVED; 3406 break; 3407 case CM_DREQ_ATTR_ID: 3408 event = IB_CM_DREQ_RECEIVED; 3409 break; 3410 case CM_DREP_ATTR_ID: 3411 event = IB_CM_DREP_RECEIVED; 3412 break; 3413 case CM_SIDR_REQ_ATTR_ID: 3414 event = IB_CM_SIDR_REQ_RECEIVED; 3415 break; 3416 case CM_SIDR_REP_ATTR_ID: 3417 event = IB_CM_SIDR_REP_RECEIVED; 3418 break; 3419 case CM_LAP_ATTR_ID: 3420 paths = 1; 3421 event = IB_CM_LAP_RECEIVED; 3422 break; 3423 case CM_APR_ATTR_ID: 3424 event = IB_CM_APR_RECEIVED; 3425 break; 3426 default: 3427 ib_free_recv_mad(mad_recv_wc); 3428 return; 3429 } 3430 3431 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3432 atomic_long_inc(&port->counter_group[CM_RECV]. 3433 counter[attr_id - CM_ATTR_ID_OFFSET]); 3434 3435 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3436 GFP_KERNEL); 3437 if (!work) { 3438 ib_free_recv_mad(mad_recv_wc); 3439 return; 3440 } 3441 3442 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3443 work->cm_event.event = event; 3444 work->mad_recv_wc = mad_recv_wc; 3445 work->port = port; 3446 queue_delayed_work(cm.wq, &work->work, 0); 3447} 3448 3449static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3450 struct ib_qp_attr *qp_attr, 3451 int *qp_attr_mask) 3452{ 3453 unsigned long flags; 3454 int ret; 3455 3456 spin_lock_irqsave(&cm_id_priv->lock, flags); 3457 switch (cm_id_priv->id.state) { 3458 case IB_CM_REQ_SENT: 3459 case IB_CM_MRA_REQ_RCVD: 3460 case IB_CM_REQ_RCVD: 3461 case IB_CM_MRA_REQ_SENT: 3462 case IB_CM_REP_RCVD: 3463 case IB_CM_MRA_REP_SENT: 3464 case IB_CM_REP_SENT: 3465 case IB_CM_MRA_REP_RCVD: 3466 case IB_CM_ESTABLISHED: 3467 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3468 IB_QP_PKEY_INDEX | IB_QP_PORT; 3469 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3470 if (cm_id_priv->responder_resources) 3471 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3472 IB_ACCESS_REMOTE_ATOMIC; 3473 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3474 qp_attr->port_num = cm_id_priv->av.port->port_num; 3475 ret = 0; 3476 break; 3477 default: 3478 ret = -EINVAL; 3479 break; 3480 } 3481 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3482 return ret; 3483} 3484 3485static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3486 struct ib_qp_attr *qp_attr, 3487 int *qp_attr_mask) 3488{ 3489 unsigned long flags; 3490 int ret; 3491 3492 spin_lock_irqsave(&cm_id_priv->lock, flags); 3493 switch (cm_id_priv->id.state) { 3494 case IB_CM_REQ_RCVD: 3495 case IB_CM_MRA_REQ_SENT: 3496 case IB_CM_REP_RCVD: 3497 case IB_CM_MRA_REP_SENT: 3498 case IB_CM_REP_SENT: 3499 case IB_CM_MRA_REP_RCVD: 3500 case IB_CM_ESTABLISHED: 3501 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3502 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3503 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3504 qp_attr->path_mtu = cm_id_priv->path_mtu; 3505 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3506 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3507 if (cm_id_priv->qp_type == IB_QPT_RC || 3508 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3509 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3510 IB_QP_MIN_RNR_TIMER; 3511 qp_attr->max_dest_rd_atomic = 3512 cm_id_priv->responder_resources; 3513 qp_attr->min_rnr_timer = 0; 3514 } 3515 if (cm_id_priv->alt_av.ah_attr.dlid) { 3516 *qp_attr_mask |= IB_QP_ALT_PATH; 3517 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3518 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3519 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3520 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3521 } 3522 ret = 0; 3523 break; 3524 default: 3525 ret = -EINVAL; 3526 break; 3527 } 3528 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3529 return ret; 3530} 3531 3532static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3533 struct ib_qp_attr *qp_attr, 3534 int *qp_attr_mask) 3535{ 3536 unsigned long flags; 3537 int ret; 3538 3539 spin_lock_irqsave(&cm_id_priv->lock, flags); 3540 switch (cm_id_priv->id.state) { 3541 /* Allow transition to RTS before sending REP */ 3542 case IB_CM_REQ_RCVD: 3543 case IB_CM_MRA_REQ_SENT: 3544 3545 case IB_CM_REP_RCVD: 3546 case IB_CM_MRA_REP_SENT: 3547 case IB_CM_REP_SENT: 3548 case IB_CM_MRA_REP_RCVD: 3549 case IB_CM_ESTABLISHED: 3550 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3551 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3552 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3553 switch (cm_id_priv->qp_type) { 3554 case IB_QPT_RC: 3555 case IB_QPT_XRC_INI: 3556 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3557 IB_QP_MAX_QP_RD_ATOMIC; 3558 qp_attr->retry_cnt = cm_id_priv->retry_count; 3559 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3560 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3561 /* fall through */ 3562 case IB_QPT_XRC_TGT: 3563 *qp_attr_mask |= IB_QP_TIMEOUT; 3564 qp_attr->timeout = cm_id_priv->av.timeout; 3565 break; 3566 default: 3567 break; 3568 } 3569 if (cm_id_priv->alt_av.ah_attr.dlid) { 3570 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3571 qp_attr->path_mig_state = IB_MIG_REARM; 3572 } 3573 } else { 3574 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3575 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3576 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3577 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3578 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3579 qp_attr->path_mig_state = IB_MIG_REARM; 3580 } 3581 ret = 0; 3582 break; 3583 default: 3584 ret = -EINVAL; 3585 break; 3586 } 3587 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3588 return ret; 3589} 3590 3591int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3592 struct ib_qp_attr *qp_attr, 3593 int *qp_attr_mask) 3594{ 3595 struct cm_id_private *cm_id_priv; 3596 int ret; 3597 3598 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3599 switch (qp_attr->qp_state) { 3600 case IB_QPS_INIT: 3601 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3602 break; 3603 case IB_QPS_RTR: 3604 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3605 break; 3606 case IB_QPS_RTS: 3607 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3608 break; 3609 default: 3610 ret = -EINVAL; 3611 break; 3612 } 3613 return ret; 3614} 3615EXPORT_SYMBOL(ib_cm_init_qp_attr); 3616 3617static void cm_get_ack_delay(struct cm_device *cm_dev) 3618{ 3619 struct ib_device_attr attr; 3620 3621 if (ib_query_device(cm_dev->ib_device, &attr)) 3622 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3623 else 3624 cm_dev->ack_delay = attr.local_ca_ack_delay; 3625} 3626 3627static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3628 char *buf) 3629{ 3630 struct cm_counter_group *group; 3631 struct cm_counter_attribute *cm_attr; 3632 3633 group = container_of(obj, struct cm_counter_group, obj); 3634 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3635 3636 return sprintf(buf, "%ld\n", 3637 atomic_long_read(&group->counter[cm_attr->index])); 3638} 3639 3640static const struct sysfs_ops cm_counter_ops = { 3641 .show = cm_show_counter 3642}; 3643 3644static struct kobj_type cm_counter_obj_type = { 3645 .sysfs_ops = &cm_counter_ops, 3646 .default_attrs = cm_counter_default_attrs 3647}; 3648 3649static void cm_release_port_obj(struct kobject *obj) 3650{ 3651 struct cm_port *cm_port; 3652 3653 cm_port = container_of(obj, struct cm_port, port_obj); 3654 kfree(cm_port); 3655} 3656 3657static struct kobj_type cm_port_obj_type = { 3658 .release = cm_release_port_obj 3659}; 3660 3661static char *cm_devnode(struct device *dev, mode_t *mode) 3662{ 3663 if (mode) 3664 *mode = 0666; 3665 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3666} 3667 3668struct class cm_class = { 3669 .owner = THIS_MODULE, 3670 .name = "infiniband_cm", 3671 .devnode = cm_devnode, 3672}; 3673EXPORT_SYMBOL(cm_class); 3674 3675static int cm_create_port_fs(struct cm_port *port) 3676{ 3677 int i, ret; 3678 3679 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3680 &port->cm_dev->device->kobj, 3681 "%d", port->port_num); 3682 if (ret) { 3683 kfree(port); 3684 return ret; 3685 } 3686 3687 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3688 ret = kobject_init_and_add(&port->counter_group[i].obj, 3689 &cm_counter_obj_type, 3690 &port->port_obj, 3691 "%s", counter_group_names[i]); 3692 if (ret) 3693 goto error; 3694 } 3695 3696 return 0; 3697 3698error: 3699 while (i--) 3700 kobject_put(&port->counter_group[i].obj); 3701 kobject_put(&port->port_obj); 3702 return ret; 3703 3704} 3705 3706static void cm_remove_port_fs(struct cm_port *port) 3707{ 3708 int i; 3709 3710 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3711 kobject_put(&port->counter_group[i].obj); 3712 3713 kobject_put(&port->port_obj); 3714} 3715 3716static void cm_add_one(struct ib_device *ib_device) 3717{ 3718 struct cm_device *cm_dev; 3719 struct cm_port *port; 3720 struct ib_mad_reg_req reg_req = { 3721 .mgmt_class = IB_MGMT_CLASS_CM, 3722 .mgmt_class_version = IB_CM_CLASS_VERSION 3723 }; 3724 struct ib_port_modify port_modify = { 3725 .set_port_cap_mask = IB_PORT_CM_SUP 3726 }; 3727 unsigned long flags; 3728 int ret; 3729 u8 i; 3730 3731 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3732 return; 3733 3734 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3735 ib_device->phys_port_cnt, GFP_KERNEL); 3736 if (!cm_dev) 3737 return; 3738 3739 cm_dev->ib_device = ib_device; 3740 cm_get_ack_delay(cm_dev); 3741 3742 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3743 MKDEV(0, 0), NULL, 3744 "%s", ib_device->name); 3745 if (IS_ERR(cm_dev->device)) { 3746 kfree(cm_dev); 3747 return; 3748 } 3749 3750 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3751 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3752 port = kzalloc(sizeof *port, GFP_KERNEL); 3753 if (!port) 3754 goto error1; 3755 3756 cm_dev->port[i-1] = port; 3757 port->cm_dev = cm_dev; 3758 port->port_num = i; 3759 3760 ret = cm_create_port_fs(port); 3761 if (ret) 3762 goto error1; 3763 3764 port->mad_agent = ib_register_mad_agent(ib_device, i, 3765 IB_QPT_GSI, 3766 ®_req, 3767 0, 3768 cm_send_handler, 3769 cm_recv_handler, 3770 port); 3771 if (IS_ERR(port->mad_agent)) 3772 goto error2; 3773 3774 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3775 if (ret) 3776 goto error3; 3777 } 3778 ib_set_client_data(ib_device, &cm_client, cm_dev); 3779 3780 write_lock_irqsave(&cm.device_lock, flags); 3781 list_add_tail(&cm_dev->list, &cm.device_list); 3782 write_unlock_irqrestore(&cm.device_lock, flags); 3783 return; 3784 3785error3: 3786 ib_unregister_mad_agent(port->mad_agent); 3787error2: 3788 cm_remove_port_fs(port); 3789error1: 3790 port_modify.set_port_cap_mask = 0; 3791 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3792 while (--i) { 3793 port = cm_dev->port[i-1]; 3794 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3795 ib_unregister_mad_agent(port->mad_agent); 3796 cm_remove_port_fs(port); 3797 } 3798 device_unregister(cm_dev->device); 3799 kfree(cm_dev); 3800} 3801 3802static void cm_remove_one(struct ib_device *ib_device) 3803{ 3804 struct cm_device *cm_dev; 3805 struct cm_port *port; 3806 struct ib_port_modify port_modify = { 3807 .clr_port_cap_mask = IB_PORT_CM_SUP 3808 }; 3809 unsigned long flags; 3810 int i; 3811 3812 cm_dev = ib_get_client_data(ib_device, &cm_client); 3813 if (!cm_dev) 3814 return; 3815 3816 write_lock_irqsave(&cm.device_lock, flags); 3817 list_del(&cm_dev->list); 3818 write_unlock_irqrestore(&cm.device_lock, flags); 3819 3820 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3821 port = cm_dev->port[i-1]; 3822 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3823 ib_unregister_mad_agent(port->mad_agent); 3824 flush_workqueue(cm.wq); 3825 cm_remove_port_fs(port); 3826 } 3827 device_unregister(cm_dev->device); 3828 kfree(cm_dev); 3829} 3830 3831static int __init ib_cm_init(void) 3832{ 3833 int ret; 3834 3835 memset(&cm, 0, sizeof cm); 3836 INIT_LIST_HEAD(&cm.device_list); 3837 rwlock_init(&cm.device_lock); 3838 spin_lock_init(&cm.lock); 3839 cm.listen_service_table = RB_ROOT; 3840 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3841 cm.remote_id_table = RB_ROOT; 3842 cm.remote_qp_table = RB_ROOT; 3843 cm.remote_sidr_table = RB_ROOT; 3844 idr_init(&cm.local_id_table); 3845 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3846 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3847 INIT_LIST_HEAD(&cm.timewait_list); 3848 3849 ret = class_register(&cm_class); 3850 if (ret) 3851 return -ENOMEM; 3852 3853 cm.wq = create_workqueue("ib_cm"); 3854 if (!cm.wq) { 3855 ret = -ENOMEM; 3856 goto error1; 3857 } 3858 3859 ret = ib_register_client(&cm_client); 3860 if (ret) 3861 goto error2; 3862 3863 return 0; 3864error2: 3865 destroy_workqueue(cm.wq); 3866error1: 3867 class_unregister(&cm_class); 3868 return ret; 3869} 3870 3871static void __exit ib_cm_cleanup(void) 3872{ 3873 struct cm_timewait_info *timewait_info, *tmp; 3874 3875 spin_lock_irq(&cm.lock); 3876 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3877 cancel_delayed_work(&timewait_info->work.work); 3878 spin_unlock_irq(&cm.lock); 3879 3880 ib_unregister_client(&cm_client); 3881 destroy_workqueue(cm.wq); 3882 3883 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3884 list_del(&timewait_info->list); 3885 kfree(timewait_info); 3886 } 3887 3888 class_unregister(&cm_class); 3889 idr_destroy(&cm.local_id_table); 3890} 3891 3892module_init(ib_cm_init); 3893module_exit(ib_cm_cleanup); 3894 3895