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/module.h> 40 #include <linux/err.h> 41 #include <linux/idr.h> 42 #include <linux/interrupt.h> 43 #include <linux/random.h> 44 #include <linux/rbtree.h> 45 #include <linux/spinlock.h> 46 #include <linux/slab.h> 47 #include <linux/sysfs.h> 48 #include <linux/workqueue.h> 49 #include <linux/kdev_t.h> 50 #include <linux/etherdevice.h> 51 52 #include <rdma/ib_cache.h> 53 #include <rdma/ib_cm.h> 54 #include "cm_msgs.h" 55 56 MODULE_AUTHOR("Sean Hefty"); 57 MODULE_DESCRIPTION("InfiniBand CM"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 60 static void cm_add_one(struct ib_device *device); 61 static void cm_remove_one(struct ib_device *device); 62 63 static struct ib_client cm_client = { 64 .name = "cm", 65 .add = cm_add_one, 66 .remove = cm_remove_one 67 }; 68 69 static struct ib_cm { 70 spinlock_t lock; 71 struct list_head device_list; 72 rwlock_t device_lock; 73 struct rb_root listen_service_table; 74 u64 listen_service_id; 75 /* struct rb_root peer_service_table; todo: fix peer to peer */ 76 struct rb_root remote_qp_table; 77 struct rb_root remote_id_table; 78 struct rb_root remote_sidr_table; 79 struct idr local_id_table; 80 __be32 random_id_operand; 81 struct list_head timewait_list; 82 struct workqueue_struct *wq; 83 } cm; 84 85 /* Counter indexes ordered by attribute ID */ 86 enum { 87 CM_REQ_COUNTER, 88 CM_MRA_COUNTER, 89 CM_REJ_COUNTER, 90 CM_REP_COUNTER, 91 CM_RTU_COUNTER, 92 CM_DREQ_COUNTER, 93 CM_DREP_COUNTER, 94 CM_SIDR_REQ_COUNTER, 95 CM_SIDR_REP_COUNTER, 96 CM_LAP_COUNTER, 97 CM_APR_COUNTER, 98 CM_ATTR_COUNT, 99 CM_ATTR_ID_OFFSET = 0x0010, 100 }; 101 102 enum { 103 CM_XMIT, 104 CM_XMIT_RETRIES, 105 CM_RECV, 106 CM_RECV_DUPLICATES, 107 CM_COUNTER_GROUPS 108 }; 109 110 static char const counter_group_names[CM_COUNTER_GROUPS] 111 [sizeof("cm_rx_duplicates")] = { 112 "cm_tx_msgs", "cm_tx_retries", 113 "cm_rx_msgs", "cm_rx_duplicates" 114 }; 115 116 struct cm_counter_group { 117 struct kobject obj; 118 atomic_long_t counter[CM_ATTR_COUNT]; 119 }; 120 121 struct cm_counter_attribute { 122 struct attribute attr; 123 int index; 124 }; 125 126 #define CM_COUNTER_ATTR(_name, _index) \ 127 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 128 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 129 .index = _index \ 130 } 131 132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 143 144 static struct attribute *cm_counter_default_attrs[] = { 145 &cm_req_counter_attr.attr, 146 &cm_mra_counter_attr.attr, 147 &cm_rej_counter_attr.attr, 148 &cm_rep_counter_attr.attr, 149 &cm_rtu_counter_attr.attr, 150 &cm_dreq_counter_attr.attr, 151 &cm_drep_counter_attr.attr, 152 &cm_sidr_req_counter_attr.attr, 153 &cm_sidr_rep_counter_attr.attr, 154 &cm_lap_counter_attr.attr, 155 &cm_apr_counter_attr.attr, 156 NULL 157 }; 158 159 struct cm_port { 160 struct cm_device *cm_dev; 161 struct ib_mad_agent *mad_agent; 162 struct kobject port_obj; 163 u8 port_num; 164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 165 }; 166 167 struct cm_device { 168 struct list_head list; 169 struct ib_device *ib_device; 170 struct device *device; 171 u8 ack_delay; 172 struct cm_port *port[0]; 173 }; 174 175 struct cm_av { 176 struct cm_port *port; 177 union ib_gid dgid; 178 struct ib_ah_attr ah_attr; 179 u16 pkey_index; 180 u8 timeout; 181 u8 valid; 182 u8 smac[ETH_ALEN]; 183 }; 184 185 struct cm_work { 186 struct delayed_work work; 187 struct list_head list; 188 struct cm_port *port; 189 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 190 __be32 local_id; /* Established / timewait */ 191 __be32 remote_id; 192 struct ib_cm_event cm_event; 193 struct ib_sa_path_rec path[0]; 194 }; 195 196 struct cm_timewait_info { 197 struct cm_work work; /* Must be first. */ 198 struct list_head list; 199 struct rb_node remote_qp_node; 200 struct rb_node remote_id_node; 201 __be64 remote_ca_guid; 202 __be32 remote_qpn; 203 u8 inserted_remote_qp; 204 u8 inserted_remote_id; 205 }; 206 207 struct cm_id_private { 208 struct ib_cm_id id; 209 210 struct rb_node service_node; 211 struct rb_node sidr_id_node; 212 spinlock_t lock; /* Do not acquire inside cm.lock */ 213 struct completion comp; 214 atomic_t refcount; 215 216 struct ib_mad_send_buf *msg; 217 struct cm_timewait_info *timewait_info; 218 /* todo: use alternate port on send failure */ 219 struct cm_av av; 220 struct cm_av alt_av; 221 struct ib_cm_compare_data *compare_data; 222 223 void *private_data; 224 __be64 tid; 225 __be32 local_qpn; 226 __be32 remote_qpn; 227 enum ib_qp_type qp_type; 228 __be32 sq_psn; 229 __be32 rq_psn; 230 int timeout_ms; 231 enum ib_mtu path_mtu; 232 __be16 pkey; 233 u8 private_data_len; 234 u8 max_cm_retries; 235 u8 peer_to_peer; 236 u8 responder_resources; 237 u8 initiator_depth; 238 u8 retry_count; 239 u8 rnr_retry_count; 240 u8 service_timeout; 241 u8 target_ack_delay; 242 243 struct list_head work_list; 244 atomic_t work_count; 245 }; 246 247 static void cm_work_handler(struct work_struct *work); 248 249 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 250 { 251 if (atomic_dec_and_test(&cm_id_priv->refcount)) 252 complete(&cm_id_priv->comp); 253 } 254 255 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 256 struct ib_mad_send_buf **msg) 257 { 258 struct ib_mad_agent *mad_agent; 259 struct ib_mad_send_buf *m; 260 struct ib_ah *ah; 261 262 mad_agent = cm_id_priv->av.port->mad_agent; 263 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 264 if (IS_ERR(ah)) 265 return PTR_ERR(ah); 266 267 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 268 cm_id_priv->av.pkey_index, 269 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 270 GFP_ATOMIC); 271 if (IS_ERR(m)) { 272 ib_destroy_ah(ah); 273 return PTR_ERR(m); 274 } 275 276 /* Timeout set by caller if response is expected. */ 277 m->ah = ah; 278 m->retries = cm_id_priv->max_cm_retries; 279 280 atomic_inc(&cm_id_priv->refcount); 281 m->context[0] = cm_id_priv; 282 *msg = m; 283 return 0; 284 } 285 286 static int cm_alloc_response_msg(struct cm_port *port, 287 struct ib_mad_recv_wc *mad_recv_wc, 288 struct ib_mad_send_buf **msg) 289 { 290 struct ib_mad_send_buf *m; 291 struct ib_ah *ah; 292 293 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 294 mad_recv_wc->recv_buf.grh, port->port_num); 295 if (IS_ERR(ah)) 296 return PTR_ERR(ah); 297 298 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 299 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 300 GFP_ATOMIC); 301 if (IS_ERR(m)) { 302 ib_destroy_ah(ah); 303 return PTR_ERR(m); 304 } 305 m->ah = ah; 306 *msg = m; 307 return 0; 308 } 309 310 static void cm_free_msg(struct ib_mad_send_buf *msg) 311 { 312 ib_destroy_ah(msg->ah); 313 if (msg->context[0]) 314 cm_deref_id(msg->context[0]); 315 ib_free_send_mad(msg); 316 } 317 318 static void * cm_copy_private_data(const void *private_data, 319 u8 private_data_len) 320 { 321 void *data; 322 323 if (!private_data || !private_data_len) 324 return NULL; 325 326 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 327 if (!data) 328 return ERR_PTR(-ENOMEM); 329 330 return data; 331 } 332 333 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 334 void *private_data, u8 private_data_len) 335 { 336 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 337 kfree(cm_id_priv->private_data); 338 339 cm_id_priv->private_data = private_data; 340 cm_id_priv->private_data_len = private_data_len; 341 } 342 343 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 344 struct ib_grh *grh, struct cm_av *av) 345 { 346 av->port = port; 347 av->pkey_index = wc->pkey_index; 348 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 349 grh, &av->ah_attr); 350 } 351 352 int ib_update_cm_av(struct ib_cm_id *id, const u8 *smac, const u8 *alt_smac) 353 { 354 struct cm_id_private *cm_id_priv; 355 356 cm_id_priv = container_of(id, struct cm_id_private, id); 357 358 if (smac != NULL) 359 memcpy(cm_id_priv->av.smac, smac, sizeof(cm_id_priv->av.smac)); 360 361 if (alt_smac != NULL) 362 memcpy(cm_id_priv->alt_av.smac, alt_smac, 363 sizeof(cm_id_priv->alt_av.smac)); 364 365 return 0; 366 } 367 EXPORT_SYMBOL(ib_update_cm_av); 368 369 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 370 { 371 struct cm_device *cm_dev; 372 struct cm_port *port = NULL; 373 unsigned long flags; 374 int ret; 375 u8 p; 376 377 read_lock_irqsave(&cm.device_lock, flags); 378 list_for_each_entry(cm_dev, &cm.device_list, list) { 379 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 380 &p, NULL)) { 381 port = cm_dev->port[p-1]; 382 break; 383 } 384 } 385 read_unlock_irqrestore(&cm.device_lock, flags); 386 387 if (!port) 388 return -EINVAL; 389 390 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 391 be16_to_cpu(path->pkey), &av->pkey_index); 392 if (ret) 393 return ret; 394 395 av->port = port; 396 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 397 &av->ah_attr); 398 av->timeout = path->packet_life_time + 1; 399 memcpy(av->smac, path->smac, sizeof(av->smac)); 400 401 av->valid = 1; 402 return 0; 403 } 404 405 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 406 { 407 unsigned long flags; 408 int id; 409 410 idr_preload(GFP_KERNEL); 411 spin_lock_irqsave(&cm.lock, flags); 412 413 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 414 415 spin_unlock_irqrestore(&cm.lock, flags); 416 idr_preload_end(); 417 418 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 419 return id < 0 ? id : 0; 420 } 421 422 static void cm_free_id(__be32 local_id) 423 { 424 spin_lock_irq(&cm.lock); 425 idr_remove(&cm.local_id_table, 426 (__force int) (local_id ^ cm.random_id_operand)); 427 spin_unlock_irq(&cm.lock); 428 } 429 430 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 431 { 432 struct cm_id_private *cm_id_priv; 433 434 cm_id_priv = idr_find(&cm.local_id_table, 435 (__force int) (local_id ^ cm.random_id_operand)); 436 if (cm_id_priv) { 437 if (cm_id_priv->id.remote_id == remote_id) 438 atomic_inc(&cm_id_priv->refcount); 439 else 440 cm_id_priv = NULL; 441 } 442 443 return cm_id_priv; 444 } 445 446 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 447 { 448 struct cm_id_private *cm_id_priv; 449 450 spin_lock_irq(&cm.lock); 451 cm_id_priv = cm_get_id(local_id, remote_id); 452 spin_unlock_irq(&cm.lock); 453 454 return cm_id_priv; 455 } 456 457 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 458 { 459 int i; 460 461 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 462 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 463 ((unsigned long *) mask)[i]; 464 } 465 466 static int cm_compare_data(struct ib_cm_compare_data *src_data, 467 struct ib_cm_compare_data *dst_data) 468 { 469 u8 src[IB_CM_COMPARE_SIZE]; 470 u8 dst[IB_CM_COMPARE_SIZE]; 471 472 if (!src_data || !dst_data) 473 return 0; 474 475 cm_mask_copy(src, src_data->data, dst_data->mask); 476 cm_mask_copy(dst, dst_data->data, src_data->mask); 477 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 478 } 479 480 static int cm_compare_private_data(u8 *private_data, 481 struct ib_cm_compare_data *dst_data) 482 { 483 u8 src[IB_CM_COMPARE_SIZE]; 484 485 if (!dst_data) 486 return 0; 487 488 cm_mask_copy(src, private_data, dst_data->mask); 489 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 490 } 491 492 /* 493 * Trivial helpers to strip endian annotation and compare; the 494 * endianness doesn't actually matter since we just need a stable 495 * order for the RB tree. 496 */ 497 static int be32_lt(__be32 a, __be32 b) 498 { 499 return (__force u32) a < (__force u32) b; 500 } 501 502 static int be32_gt(__be32 a, __be32 b) 503 { 504 return (__force u32) a > (__force u32) b; 505 } 506 507 static int be64_lt(__be64 a, __be64 b) 508 { 509 return (__force u64) a < (__force u64) b; 510 } 511 512 static int be64_gt(__be64 a, __be64 b) 513 { 514 return (__force u64) a > (__force u64) b; 515 } 516 517 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 518 { 519 struct rb_node **link = &cm.listen_service_table.rb_node; 520 struct rb_node *parent = NULL; 521 struct cm_id_private *cur_cm_id_priv; 522 __be64 service_id = cm_id_priv->id.service_id; 523 __be64 service_mask = cm_id_priv->id.service_mask; 524 int data_cmp; 525 526 while (*link) { 527 parent = *link; 528 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 529 service_node); 530 data_cmp = cm_compare_data(cm_id_priv->compare_data, 531 cur_cm_id_priv->compare_data); 532 if ((cur_cm_id_priv->id.service_mask & service_id) == 533 (service_mask & cur_cm_id_priv->id.service_id) && 534 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 535 !data_cmp) 536 return cur_cm_id_priv; 537 538 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 539 link = &(*link)->rb_left; 540 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 541 link = &(*link)->rb_right; 542 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 543 link = &(*link)->rb_left; 544 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 545 link = &(*link)->rb_right; 546 else if (data_cmp < 0) 547 link = &(*link)->rb_left; 548 else 549 link = &(*link)->rb_right; 550 } 551 rb_link_node(&cm_id_priv->service_node, parent, link); 552 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 553 return NULL; 554 } 555 556 static struct cm_id_private * cm_find_listen(struct ib_device *device, 557 __be64 service_id, 558 u8 *private_data) 559 { 560 struct rb_node *node = cm.listen_service_table.rb_node; 561 struct cm_id_private *cm_id_priv; 562 int data_cmp; 563 564 while (node) { 565 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 566 data_cmp = cm_compare_private_data(private_data, 567 cm_id_priv->compare_data); 568 if ((cm_id_priv->id.service_mask & service_id) == 569 cm_id_priv->id.service_id && 570 (cm_id_priv->id.device == device) && !data_cmp) 571 return cm_id_priv; 572 573 if (device < cm_id_priv->id.device) 574 node = node->rb_left; 575 else if (device > cm_id_priv->id.device) 576 node = node->rb_right; 577 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 578 node = node->rb_left; 579 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 580 node = node->rb_right; 581 else if (data_cmp < 0) 582 node = node->rb_left; 583 else 584 node = node->rb_right; 585 } 586 return NULL; 587 } 588 589 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 590 *timewait_info) 591 { 592 struct rb_node **link = &cm.remote_id_table.rb_node; 593 struct rb_node *parent = NULL; 594 struct cm_timewait_info *cur_timewait_info; 595 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 596 __be32 remote_id = timewait_info->work.remote_id; 597 598 while (*link) { 599 parent = *link; 600 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 601 remote_id_node); 602 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 603 link = &(*link)->rb_left; 604 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 605 link = &(*link)->rb_right; 606 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 607 link = &(*link)->rb_left; 608 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 609 link = &(*link)->rb_right; 610 else 611 return cur_timewait_info; 612 } 613 timewait_info->inserted_remote_id = 1; 614 rb_link_node(&timewait_info->remote_id_node, parent, link); 615 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 616 return NULL; 617 } 618 619 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 620 __be32 remote_id) 621 { 622 struct rb_node *node = cm.remote_id_table.rb_node; 623 struct cm_timewait_info *timewait_info; 624 625 while (node) { 626 timewait_info = rb_entry(node, struct cm_timewait_info, 627 remote_id_node); 628 if (be32_lt(remote_id, timewait_info->work.remote_id)) 629 node = node->rb_left; 630 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 631 node = node->rb_right; 632 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 633 node = node->rb_left; 634 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 635 node = node->rb_right; 636 else 637 return timewait_info; 638 } 639 return NULL; 640 } 641 642 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 643 *timewait_info) 644 { 645 struct rb_node **link = &cm.remote_qp_table.rb_node; 646 struct rb_node *parent = NULL; 647 struct cm_timewait_info *cur_timewait_info; 648 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 649 __be32 remote_qpn = timewait_info->remote_qpn; 650 651 while (*link) { 652 parent = *link; 653 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 654 remote_qp_node); 655 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 656 link = &(*link)->rb_left; 657 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 658 link = &(*link)->rb_right; 659 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 660 link = &(*link)->rb_left; 661 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 662 link = &(*link)->rb_right; 663 else 664 return cur_timewait_info; 665 } 666 timewait_info->inserted_remote_qp = 1; 667 rb_link_node(&timewait_info->remote_qp_node, parent, link); 668 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 669 return NULL; 670 } 671 672 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 673 *cm_id_priv) 674 { 675 struct rb_node **link = &cm.remote_sidr_table.rb_node; 676 struct rb_node *parent = NULL; 677 struct cm_id_private *cur_cm_id_priv; 678 union ib_gid *port_gid = &cm_id_priv->av.dgid; 679 __be32 remote_id = cm_id_priv->id.remote_id; 680 681 while (*link) { 682 parent = *link; 683 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 684 sidr_id_node); 685 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 686 link = &(*link)->rb_left; 687 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 688 link = &(*link)->rb_right; 689 else { 690 int cmp; 691 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 692 sizeof *port_gid); 693 if (cmp < 0) 694 link = &(*link)->rb_left; 695 else if (cmp > 0) 696 link = &(*link)->rb_right; 697 else 698 return cur_cm_id_priv; 699 } 700 } 701 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 702 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 703 return NULL; 704 } 705 706 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 707 enum ib_cm_sidr_status status) 708 { 709 struct ib_cm_sidr_rep_param param; 710 711 memset(¶m, 0, sizeof param); 712 param.status = status; 713 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 714 } 715 716 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 717 ib_cm_handler cm_handler, 718 void *context) 719 { 720 struct cm_id_private *cm_id_priv; 721 int ret; 722 723 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 724 if (!cm_id_priv) 725 return ERR_PTR(-ENOMEM); 726 727 cm_id_priv->id.state = IB_CM_IDLE; 728 cm_id_priv->id.device = device; 729 cm_id_priv->id.cm_handler = cm_handler; 730 cm_id_priv->id.context = context; 731 cm_id_priv->id.remote_cm_qpn = 1; 732 ret = cm_alloc_id(cm_id_priv); 733 if (ret) 734 goto error; 735 736 spin_lock_init(&cm_id_priv->lock); 737 init_completion(&cm_id_priv->comp); 738 INIT_LIST_HEAD(&cm_id_priv->work_list); 739 atomic_set(&cm_id_priv->work_count, -1); 740 atomic_set(&cm_id_priv->refcount, 1); 741 return &cm_id_priv->id; 742 743 error: 744 kfree(cm_id_priv); 745 return ERR_PTR(-ENOMEM); 746 } 747 EXPORT_SYMBOL(ib_create_cm_id); 748 749 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 750 { 751 struct cm_work *work; 752 753 if (list_empty(&cm_id_priv->work_list)) 754 return NULL; 755 756 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 757 list_del(&work->list); 758 return work; 759 } 760 761 static void cm_free_work(struct cm_work *work) 762 { 763 if (work->mad_recv_wc) 764 ib_free_recv_mad(work->mad_recv_wc); 765 kfree(work); 766 } 767 768 static inline int cm_convert_to_ms(int iba_time) 769 { 770 /* approximate conversion to ms from 4.096us x 2^iba_time */ 771 return 1 << max(iba_time - 8, 0); 772 } 773 774 /* 775 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 776 * Because of how ack_timeout is stored, adding one doubles the timeout. 777 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 778 * increment it (round up) only if the other is within 50%. 779 */ 780 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 781 { 782 int ack_timeout = packet_life_time + 1; 783 784 if (ack_timeout >= ca_ack_delay) 785 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 786 else 787 ack_timeout = ca_ack_delay + 788 (ack_timeout >= (ca_ack_delay - 1)); 789 790 return min(31, ack_timeout); 791 } 792 793 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 794 { 795 if (timewait_info->inserted_remote_id) { 796 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 797 timewait_info->inserted_remote_id = 0; 798 } 799 800 if (timewait_info->inserted_remote_qp) { 801 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 802 timewait_info->inserted_remote_qp = 0; 803 } 804 } 805 806 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 807 { 808 struct cm_timewait_info *timewait_info; 809 810 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 811 if (!timewait_info) 812 return ERR_PTR(-ENOMEM); 813 814 timewait_info->work.local_id = local_id; 815 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 816 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 817 return timewait_info; 818 } 819 820 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 821 { 822 int wait_time; 823 unsigned long flags; 824 825 spin_lock_irqsave(&cm.lock, flags); 826 cm_cleanup_timewait(cm_id_priv->timewait_info); 827 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 828 spin_unlock_irqrestore(&cm.lock, flags); 829 830 /* 831 * The cm_id could be destroyed by the user before we exit timewait. 832 * To protect against this, we search for the cm_id after exiting 833 * timewait before notifying the user that we've exited timewait. 834 */ 835 cm_id_priv->id.state = IB_CM_TIMEWAIT; 836 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 837 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 838 msecs_to_jiffies(wait_time)); 839 cm_id_priv->timewait_info = NULL; 840 } 841 842 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 843 { 844 unsigned long flags; 845 846 cm_id_priv->id.state = IB_CM_IDLE; 847 if (cm_id_priv->timewait_info) { 848 spin_lock_irqsave(&cm.lock, flags); 849 cm_cleanup_timewait(cm_id_priv->timewait_info); 850 spin_unlock_irqrestore(&cm.lock, flags); 851 kfree(cm_id_priv->timewait_info); 852 cm_id_priv->timewait_info = NULL; 853 } 854 } 855 856 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 857 { 858 struct cm_id_private *cm_id_priv; 859 struct cm_work *work; 860 861 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 862 retest: 863 spin_lock_irq(&cm_id_priv->lock); 864 switch (cm_id->state) { 865 case IB_CM_LISTEN: 866 cm_id->state = IB_CM_IDLE; 867 spin_unlock_irq(&cm_id_priv->lock); 868 spin_lock_irq(&cm.lock); 869 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 870 spin_unlock_irq(&cm.lock); 871 break; 872 case IB_CM_SIDR_REQ_SENT: 873 cm_id->state = IB_CM_IDLE; 874 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 875 spin_unlock_irq(&cm_id_priv->lock); 876 break; 877 case IB_CM_SIDR_REQ_RCVD: 878 spin_unlock_irq(&cm_id_priv->lock); 879 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 880 break; 881 case IB_CM_REQ_SENT: 882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 883 spin_unlock_irq(&cm_id_priv->lock); 884 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 885 &cm_id_priv->id.device->node_guid, 886 sizeof cm_id_priv->id.device->node_guid, 887 NULL, 0); 888 break; 889 case IB_CM_REQ_RCVD: 890 if (err == -ENOMEM) { 891 /* Do not reject to allow future retries. */ 892 cm_reset_to_idle(cm_id_priv); 893 spin_unlock_irq(&cm_id_priv->lock); 894 } else { 895 spin_unlock_irq(&cm_id_priv->lock); 896 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 897 NULL, 0, NULL, 0); 898 } 899 break; 900 case IB_CM_MRA_REQ_RCVD: 901 case IB_CM_REP_SENT: 902 case IB_CM_MRA_REP_RCVD: 903 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 904 /* Fall through */ 905 case IB_CM_MRA_REQ_SENT: 906 case IB_CM_REP_RCVD: 907 case IB_CM_MRA_REP_SENT: 908 spin_unlock_irq(&cm_id_priv->lock); 909 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 910 NULL, 0, NULL, 0); 911 break; 912 case IB_CM_ESTABLISHED: 913 spin_unlock_irq(&cm_id_priv->lock); 914 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 915 break; 916 ib_send_cm_dreq(cm_id, NULL, 0); 917 goto retest; 918 case IB_CM_DREQ_SENT: 919 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 920 cm_enter_timewait(cm_id_priv); 921 spin_unlock_irq(&cm_id_priv->lock); 922 break; 923 case IB_CM_DREQ_RCVD: 924 spin_unlock_irq(&cm_id_priv->lock); 925 ib_send_cm_drep(cm_id, NULL, 0); 926 break; 927 default: 928 spin_unlock_irq(&cm_id_priv->lock); 929 break; 930 } 931 932 cm_free_id(cm_id->local_id); 933 cm_deref_id(cm_id_priv); 934 wait_for_completion(&cm_id_priv->comp); 935 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 936 cm_free_work(work); 937 kfree(cm_id_priv->compare_data); 938 kfree(cm_id_priv->private_data); 939 kfree(cm_id_priv); 940 } 941 942 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 943 { 944 cm_destroy_id(cm_id, 0); 945 } 946 EXPORT_SYMBOL(ib_destroy_cm_id); 947 948 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 949 struct ib_cm_compare_data *compare_data) 950 { 951 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 952 unsigned long flags; 953 int ret = 0; 954 955 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 956 service_id &= service_mask; 957 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 958 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 959 return -EINVAL; 960 961 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 962 if (cm_id->state != IB_CM_IDLE) 963 return -EINVAL; 964 965 if (compare_data) { 966 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 967 GFP_KERNEL); 968 if (!cm_id_priv->compare_data) 969 return -ENOMEM; 970 cm_mask_copy(cm_id_priv->compare_data->data, 971 compare_data->data, compare_data->mask); 972 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 973 IB_CM_COMPARE_SIZE); 974 } 975 976 cm_id->state = IB_CM_LISTEN; 977 978 spin_lock_irqsave(&cm.lock, flags); 979 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 980 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 981 cm_id->service_mask = ~cpu_to_be64(0); 982 } else { 983 cm_id->service_id = service_id; 984 cm_id->service_mask = service_mask; 985 } 986 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 987 spin_unlock_irqrestore(&cm.lock, flags); 988 989 if (cur_cm_id_priv) { 990 cm_id->state = IB_CM_IDLE; 991 kfree(cm_id_priv->compare_data); 992 cm_id_priv->compare_data = NULL; 993 ret = -EBUSY; 994 } 995 return ret; 996 } 997 EXPORT_SYMBOL(ib_cm_listen); 998 999 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1000 enum cm_msg_sequence msg_seq) 1001 { 1002 u64 hi_tid, low_tid; 1003 1004 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1005 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1006 (msg_seq << 30)); 1007 return cpu_to_be64(hi_tid | low_tid); 1008 } 1009 1010 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1011 __be16 attr_id, __be64 tid) 1012 { 1013 hdr->base_version = IB_MGMT_BASE_VERSION; 1014 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1015 hdr->class_version = IB_CM_CLASS_VERSION; 1016 hdr->method = IB_MGMT_METHOD_SEND; 1017 hdr->attr_id = attr_id; 1018 hdr->tid = tid; 1019 } 1020 1021 static void cm_format_req(struct cm_req_msg *req_msg, 1022 struct cm_id_private *cm_id_priv, 1023 struct ib_cm_req_param *param) 1024 { 1025 struct ib_sa_path_rec *pri_path = param->primary_path; 1026 struct ib_sa_path_rec *alt_path = param->alternate_path; 1027 1028 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1029 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1030 1031 req_msg->local_comm_id = cm_id_priv->id.local_id; 1032 req_msg->service_id = param->service_id; 1033 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1034 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1035 cm_req_set_init_depth(req_msg, param->initiator_depth); 1036 cm_req_set_remote_resp_timeout(req_msg, 1037 param->remote_cm_response_timeout); 1038 cm_req_set_qp_type(req_msg, param->qp_type); 1039 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1040 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1041 cm_req_set_local_resp_timeout(req_msg, 1042 param->local_cm_response_timeout); 1043 req_msg->pkey = param->primary_path->pkey; 1044 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1045 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1046 1047 if (param->qp_type != IB_QPT_XRC_INI) { 1048 cm_req_set_resp_res(req_msg, param->responder_resources); 1049 cm_req_set_retry_count(req_msg, param->retry_count); 1050 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1051 cm_req_set_srq(req_msg, param->srq); 1052 } 1053 1054 if (pri_path->hop_limit <= 1) { 1055 req_msg->primary_local_lid = pri_path->slid; 1056 req_msg->primary_remote_lid = pri_path->dlid; 1057 } else { 1058 /* Work-around until there's a way to obtain remote LID info */ 1059 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1060 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1061 } 1062 req_msg->primary_local_gid = pri_path->sgid; 1063 req_msg->primary_remote_gid = pri_path->dgid; 1064 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1065 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1066 req_msg->primary_traffic_class = pri_path->traffic_class; 1067 req_msg->primary_hop_limit = pri_path->hop_limit; 1068 cm_req_set_primary_sl(req_msg, pri_path->sl); 1069 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1070 cm_req_set_primary_local_ack_timeout(req_msg, 1071 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1072 pri_path->packet_life_time)); 1073 1074 if (alt_path) { 1075 if (alt_path->hop_limit <= 1) { 1076 req_msg->alt_local_lid = alt_path->slid; 1077 req_msg->alt_remote_lid = alt_path->dlid; 1078 } else { 1079 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1080 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1081 } 1082 req_msg->alt_local_gid = alt_path->sgid; 1083 req_msg->alt_remote_gid = alt_path->dgid; 1084 cm_req_set_alt_flow_label(req_msg, 1085 alt_path->flow_label); 1086 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1087 req_msg->alt_traffic_class = alt_path->traffic_class; 1088 req_msg->alt_hop_limit = alt_path->hop_limit; 1089 cm_req_set_alt_sl(req_msg, alt_path->sl); 1090 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1091 cm_req_set_alt_local_ack_timeout(req_msg, 1092 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1093 alt_path->packet_life_time)); 1094 } 1095 1096 if (param->private_data && param->private_data_len) 1097 memcpy(req_msg->private_data, param->private_data, 1098 param->private_data_len); 1099 } 1100 1101 static int cm_validate_req_param(struct ib_cm_req_param *param) 1102 { 1103 /* peer-to-peer not supported */ 1104 if (param->peer_to_peer) 1105 return -EINVAL; 1106 1107 if (!param->primary_path) 1108 return -EINVAL; 1109 1110 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1111 param->qp_type != IB_QPT_XRC_INI) 1112 return -EINVAL; 1113 1114 if (param->private_data && 1115 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1116 return -EINVAL; 1117 1118 if (param->alternate_path && 1119 (param->alternate_path->pkey != param->primary_path->pkey || 1120 param->alternate_path->mtu != param->primary_path->mtu)) 1121 return -EINVAL; 1122 1123 return 0; 1124 } 1125 1126 int ib_send_cm_req(struct ib_cm_id *cm_id, 1127 struct ib_cm_req_param *param) 1128 { 1129 struct cm_id_private *cm_id_priv; 1130 struct cm_req_msg *req_msg; 1131 unsigned long flags; 1132 int ret; 1133 1134 ret = cm_validate_req_param(param); 1135 if (ret) 1136 return ret; 1137 1138 /* Verify that we're not in timewait. */ 1139 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1140 spin_lock_irqsave(&cm_id_priv->lock, flags); 1141 if (cm_id->state != IB_CM_IDLE) { 1142 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1143 ret = -EINVAL; 1144 goto out; 1145 } 1146 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1147 1148 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1149 id.local_id); 1150 if (IS_ERR(cm_id_priv->timewait_info)) { 1151 ret = PTR_ERR(cm_id_priv->timewait_info); 1152 goto out; 1153 } 1154 1155 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1156 if (ret) 1157 goto error1; 1158 if (param->alternate_path) { 1159 ret = cm_init_av_by_path(param->alternate_path, 1160 &cm_id_priv->alt_av); 1161 if (ret) 1162 goto error1; 1163 } 1164 cm_id->service_id = param->service_id; 1165 cm_id->service_mask = ~cpu_to_be64(0); 1166 cm_id_priv->timeout_ms = cm_convert_to_ms( 1167 param->primary_path->packet_life_time) * 2 + 1168 cm_convert_to_ms( 1169 param->remote_cm_response_timeout); 1170 cm_id_priv->max_cm_retries = param->max_cm_retries; 1171 cm_id_priv->initiator_depth = param->initiator_depth; 1172 cm_id_priv->responder_resources = param->responder_resources; 1173 cm_id_priv->retry_count = param->retry_count; 1174 cm_id_priv->path_mtu = param->primary_path->mtu; 1175 cm_id_priv->pkey = param->primary_path->pkey; 1176 cm_id_priv->qp_type = param->qp_type; 1177 1178 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1179 if (ret) 1180 goto error1; 1181 1182 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1183 cm_format_req(req_msg, cm_id_priv, param); 1184 cm_id_priv->tid = req_msg->hdr.tid; 1185 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1186 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1187 1188 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1189 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1190 1191 spin_lock_irqsave(&cm_id_priv->lock, flags); 1192 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1193 if (ret) { 1194 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1195 goto error2; 1196 } 1197 BUG_ON(cm_id->state != IB_CM_IDLE); 1198 cm_id->state = IB_CM_REQ_SENT; 1199 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1200 return 0; 1201 1202 error2: cm_free_msg(cm_id_priv->msg); 1203 error1: kfree(cm_id_priv->timewait_info); 1204 out: return ret; 1205 } 1206 EXPORT_SYMBOL(ib_send_cm_req); 1207 1208 static int cm_issue_rej(struct cm_port *port, 1209 struct ib_mad_recv_wc *mad_recv_wc, 1210 enum ib_cm_rej_reason reason, 1211 enum cm_msg_response msg_rejected, 1212 void *ari, u8 ari_length) 1213 { 1214 struct ib_mad_send_buf *msg = NULL; 1215 struct cm_rej_msg *rej_msg, *rcv_msg; 1216 int ret; 1217 1218 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1219 if (ret) 1220 return ret; 1221 1222 /* We just need common CM header information. Cast to any message. */ 1223 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1224 rej_msg = (struct cm_rej_msg *) msg->mad; 1225 1226 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1227 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1228 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1229 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1230 rej_msg->reason = cpu_to_be16(reason); 1231 1232 if (ari && ari_length) { 1233 cm_rej_set_reject_info_len(rej_msg, ari_length); 1234 memcpy(rej_msg->ari, ari, ari_length); 1235 } 1236 1237 ret = ib_post_send_mad(msg, NULL); 1238 if (ret) 1239 cm_free_msg(msg); 1240 1241 return ret; 1242 } 1243 1244 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1245 __be32 local_qpn, __be32 remote_qpn) 1246 { 1247 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1248 ((local_ca_guid == remote_ca_guid) && 1249 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1250 } 1251 1252 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1253 struct ib_sa_path_rec *primary_path, 1254 struct ib_sa_path_rec *alt_path) 1255 { 1256 memset(primary_path, 0, sizeof *primary_path); 1257 primary_path->dgid = req_msg->primary_local_gid; 1258 primary_path->sgid = req_msg->primary_remote_gid; 1259 primary_path->dlid = req_msg->primary_local_lid; 1260 primary_path->slid = req_msg->primary_remote_lid; 1261 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1262 primary_path->hop_limit = req_msg->primary_hop_limit; 1263 primary_path->traffic_class = req_msg->primary_traffic_class; 1264 primary_path->reversible = 1; 1265 primary_path->pkey = req_msg->pkey; 1266 primary_path->sl = cm_req_get_primary_sl(req_msg); 1267 primary_path->mtu_selector = IB_SA_EQ; 1268 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1269 primary_path->rate_selector = IB_SA_EQ; 1270 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1271 primary_path->packet_life_time_selector = IB_SA_EQ; 1272 primary_path->packet_life_time = 1273 cm_req_get_primary_local_ack_timeout(req_msg); 1274 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1275 1276 if (req_msg->alt_local_lid) { 1277 memset(alt_path, 0, sizeof *alt_path); 1278 alt_path->dgid = req_msg->alt_local_gid; 1279 alt_path->sgid = req_msg->alt_remote_gid; 1280 alt_path->dlid = req_msg->alt_local_lid; 1281 alt_path->slid = req_msg->alt_remote_lid; 1282 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1283 alt_path->hop_limit = req_msg->alt_hop_limit; 1284 alt_path->traffic_class = req_msg->alt_traffic_class; 1285 alt_path->reversible = 1; 1286 alt_path->pkey = req_msg->pkey; 1287 alt_path->sl = cm_req_get_alt_sl(req_msg); 1288 alt_path->mtu_selector = IB_SA_EQ; 1289 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1290 alt_path->rate_selector = IB_SA_EQ; 1291 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1292 alt_path->packet_life_time_selector = IB_SA_EQ; 1293 alt_path->packet_life_time = 1294 cm_req_get_alt_local_ack_timeout(req_msg); 1295 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1296 } 1297 } 1298 1299 static void cm_format_req_event(struct cm_work *work, 1300 struct cm_id_private *cm_id_priv, 1301 struct ib_cm_id *listen_id) 1302 { 1303 struct cm_req_msg *req_msg; 1304 struct ib_cm_req_event_param *param; 1305 1306 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1307 param = &work->cm_event.param.req_rcvd; 1308 param->listen_id = listen_id; 1309 param->port = cm_id_priv->av.port->port_num; 1310 param->primary_path = &work->path[0]; 1311 if (req_msg->alt_local_lid) 1312 param->alternate_path = &work->path[1]; 1313 else 1314 param->alternate_path = NULL; 1315 param->remote_ca_guid = req_msg->local_ca_guid; 1316 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1317 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1318 param->qp_type = cm_req_get_qp_type(req_msg); 1319 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1320 param->responder_resources = cm_req_get_init_depth(req_msg); 1321 param->initiator_depth = cm_req_get_resp_res(req_msg); 1322 param->local_cm_response_timeout = 1323 cm_req_get_remote_resp_timeout(req_msg); 1324 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1325 param->remote_cm_response_timeout = 1326 cm_req_get_local_resp_timeout(req_msg); 1327 param->retry_count = cm_req_get_retry_count(req_msg); 1328 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1329 param->srq = cm_req_get_srq(req_msg); 1330 work->cm_event.private_data = &req_msg->private_data; 1331 } 1332 1333 static void cm_process_work(struct cm_id_private *cm_id_priv, 1334 struct cm_work *work) 1335 { 1336 int ret; 1337 1338 /* We will typically only have the current event to report. */ 1339 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1340 cm_free_work(work); 1341 1342 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1343 spin_lock_irq(&cm_id_priv->lock); 1344 work = cm_dequeue_work(cm_id_priv); 1345 spin_unlock_irq(&cm_id_priv->lock); 1346 BUG_ON(!work); 1347 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1348 &work->cm_event); 1349 cm_free_work(work); 1350 } 1351 cm_deref_id(cm_id_priv); 1352 if (ret) 1353 cm_destroy_id(&cm_id_priv->id, ret); 1354 } 1355 1356 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1357 struct cm_id_private *cm_id_priv, 1358 enum cm_msg_response msg_mraed, u8 service_timeout, 1359 const void *private_data, u8 private_data_len) 1360 { 1361 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1362 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1363 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1364 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1365 cm_mra_set_service_timeout(mra_msg, service_timeout); 1366 1367 if (private_data && private_data_len) 1368 memcpy(mra_msg->private_data, private_data, private_data_len); 1369 } 1370 1371 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1372 struct cm_id_private *cm_id_priv, 1373 enum ib_cm_rej_reason reason, 1374 void *ari, 1375 u8 ari_length, 1376 const void *private_data, 1377 u8 private_data_len) 1378 { 1379 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1380 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1381 1382 switch(cm_id_priv->id.state) { 1383 case IB_CM_REQ_RCVD: 1384 rej_msg->local_comm_id = 0; 1385 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1386 break; 1387 case IB_CM_MRA_REQ_SENT: 1388 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1389 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1390 break; 1391 case IB_CM_REP_RCVD: 1392 case IB_CM_MRA_REP_SENT: 1393 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1394 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1395 break; 1396 default: 1397 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1398 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1399 break; 1400 } 1401 1402 rej_msg->reason = cpu_to_be16(reason); 1403 if (ari && ari_length) { 1404 cm_rej_set_reject_info_len(rej_msg, ari_length); 1405 memcpy(rej_msg->ari, ari, ari_length); 1406 } 1407 1408 if (private_data && private_data_len) 1409 memcpy(rej_msg->private_data, private_data, private_data_len); 1410 } 1411 1412 static void cm_dup_req_handler(struct cm_work *work, 1413 struct cm_id_private *cm_id_priv) 1414 { 1415 struct ib_mad_send_buf *msg = NULL; 1416 int ret; 1417 1418 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1419 counter[CM_REQ_COUNTER]); 1420 1421 /* Quick state check to discard duplicate REQs. */ 1422 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1423 return; 1424 1425 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1426 if (ret) 1427 return; 1428 1429 spin_lock_irq(&cm_id_priv->lock); 1430 switch (cm_id_priv->id.state) { 1431 case IB_CM_MRA_REQ_SENT: 1432 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1433 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1434 cm_id_priv->private_data, 1435 cm_id_priv->private_data_len); 1436 break; 1437 case IB_CM_TIMEWAIT: 1438 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1439 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1440 break; 1441 default: 1442 goto unlock; 1443 } 1444 spin_unlock_irq(&cm_id_priv->lock); 1445 1446 ret = ib_post_send_mad(msg, NULL); 1447 if (ret) 1448 goto free; 1449 return; 1450 1451 unlock: spin_unlock_irq(&cm_id_priv->lock); 1452 free: cm_free_msg(msg); 1453 } 1454 1455 static struct cm_id_private * cm_match_req(struct cm_work *work, 1456 struct cm_id_private *cm_id_priv) 1457 { 1458 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1459 struct cm_timewait_info *timewait_info; 1460 struct cm_req_msg *req_msg; 1461 1462 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1463 1464 /* Check for possible duplicate REQ. */ 1465 spin_lock_irq(&cm.lock); 1466 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1467 if (timewait_info) { 1468 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1469 timewait_info->work.remote_id); 1470 spin_unlock_irq(&cm.lock); 1471 if (cur_cm_id_priv) { 1472 cm_dup_req_handler(work, cur_cm_id_priv); 1473 cm_deref_id(cur_cm_id_priv); 1474 } 1475 return NULL; 1476 } 1477 1478 /* Check for stale connections. */ 1479 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1480 if (timewait_info) { 1481 cm_cleanup_timewait(cm_id_priv->timewait_info); 1482 spin_unlock_irq(&cm.lock); 1483 cm_issue_rej(work->port, work->mad_recv_wc, 1484 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1485 NULL, 0); 1486 return NULL; 1487 } 1488 1489 /* Find matching listen request. */ 1490 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1491 req_msg->service_id, 1492 req_msg->private_data); 1493 if (!listen_cm_id_priv) { 1494 cm_cleanup_timewait(cm_id_priv->timewait_info); 1495 spin_unlock_irq(&cm.lock); 1496 cm_issue_rej(work->port, work->mad_recv_wc, 1497 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1498 NULL, 0); 1499 goto out; 1500 } 1501 atomic_inc(&listen_cm_id_priv->refcount); 1502 atomic_inc(&cm_id_priv->refcount); 1503 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1504 atomic_inc(&cm_id_priv->work_count); 1505 spin_unlock_irq(&cm.lock); 1506 out: 1507 return listen_cm_id_priv; 1508 } 1509 1510 /* 1511 * Work-around for inter-subnet connections. If the LIDs are permissive, 1512 * we need to override the LID/SL data in the REQ with the LID information 1513 * in the work completion. 1514 */ 1515 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1516 { 1517 if (!cm_req_get_primary_subnet_local(req_msg)) { 1518 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1519 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1520 cm_req_set_primary_sl(req_msg, wc->sl); 1521 } 1522 1523 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1524 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1525 } 1526 1527 if (!cm_req_get_alt_subnet_local(req_msg)) { 1528 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1529 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1530 cm_req_set_alt_sl(req_msg, wc->sl); 1531 } 1532 1533 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1534 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1535 } 1536 } 1537 1538 static int cm_req_handler(struct cm_work *work) 1539 { 1540 struct ib_cm_id *cm_id; 1541 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1542 struct cm_req_msg *req_msg; 1543 int ret; 1544 1545 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1546 1547 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1548 if (IS_ERR(cm_id)) 1549 return PTR_ERR(cm_id); 1550 1551 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1552 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1553 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1554 work->mad_recv_wc->recv_buf.grh, 1555 &cm_id_priv->av); 1556 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1557 id.local_id); 1558 if (IS_ERR(cm_id_priv->timewait_info)) { 1559 ret = PTR_ERR(cm_id_priv->timewait_info); 1560 goto destroy; 1561 } 1562 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1563 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1564 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1565 1566 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1567 if (!listen_cm_id_priv) { 1568 ret = -EINVAL; 1569 kfree(cm_id_priv->timewait_info); 1570 goto destroy; 1571 } 1572 1573 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1574 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1575 cm_id_priv->id.service_id = req_msg->service_id; 1576 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1577 1578 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1579 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1580 1581 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1582 work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id; 1583 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1584 if (ret) { 1585 ib_get_cached_gid(work->port->cm_dev->ib_device, 1586 work->port->port_num, 0, &work->path[0].sgid); 1587 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1588 &work->path[0].sgid, sizeof work->path[0].sgid, 1589 NULL, 0); 1590 goto rejected; 1591 } 1592 if (req_msg->alt_local_lid) { 1593 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1594 if (ret) { 1595 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1596 &work->path[0].sgid, 1597 sizeof work->path[0].sgid, NULL, 0); 1598 goto rejected; 1599 } 1600 } 1601 cm_id_priv->tid = req_msg->hdr.tid; 1602 cm_id_priv->timeout_ms = cm_convert_to_ms( 1603 cm_req_get_local_resp_timeout(req_msg)); 1604 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1605 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1606 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1607 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1608 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1609 cm_id_priv->pkey = req_msg->pkey; 1610 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1611 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1612 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1613 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1614 1615 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1616 cm_process_work(cm_id_priv, work); 1617 cm_deref_id(listen_cm_id_priv); 1618 return 0; 1619 1620 rejected: 1621 atomic_dec(&cm_id_priv->refcount); 1622 cm_deref_id(listen_cm_id_priv); 1623 destroy: 1624 ib_destroy_cm_id(cm_id); 1625 return ret; 1626 } 1627 1628 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1629 struct cm_id_private *cm_id_priv, 1630 struct ib_cm_rep_param *param) 1631 { 1632 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1633 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1634 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1635 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1636 rep_msg->resp_resources = param->responder_resources; 1637 cm_rep_set_target_ack_delay(rep_msg, 1638 cm_id_priv->av.port->cm_dev->ack_delay); 1639 cm_rep_set_failover(rep_msg, param->failover_accepted); 1640 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1641 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1642 1643 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1644 rep_msg->initiator_depth = param->initiator_depth; 1645 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1646 cm_rep_set_srq(rep_msg, param->srq); 1647 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1648 } else { 1649 cm_rep_set_srq(rep_msg, 1); 1650 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1651 } 1652 1653 if (param->private_data && param->private_data_len) 1654 memcpy(rep_msg->private_data, param->private_data, 1655 param->private_data_len); 1656 } 1657 1658 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1659 struct ib_cm_rep_param *param) 1660 { 1661 struct cm_id_private *cm_id_priv; 1662 struct ib_mad_send_buf *msg; 1663 struct cm_rep_msg *rep_msg; 1664 unsigned long flags; 1665 int ret; 1666 1667 if (param->private_data && 1668 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1669 return -EINVAL; 1670 1671 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1672 spin_lock_irqsave(&cm_id_priv->lock, flags); 1673 if (cm_id->state != IB_CM_REQ_RCVD && 1674 cm_id->state != IB_CM_MRA_REQ_SENT) { 1675 ret = -EINVAL; 1676 goto out; 1677 } 1678 1679 ret = cm_alloc_msg(cm_id_priv, &msg); 1680 if (ret) 1681 goto out; 1682 1683 rep_msg = (struct cm_rep_msg *) msg->mad; 1684 cm_format_rep(rep_msg, cm_id_priv, param); 1685 msg->timeout_ms = cm_id_priv->timeout_ms; 1686 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1687 1688 ret = ib_post_send_mad(msg, NULL); 1689 if (ret) { 1690 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1691 cm_free_msg(msg); 1692 return ret; 1693 } 1694 1695 cm_id->state = IB_CM_REP_SENT; 1696 cm_id_priv->msg = msg; 1697 cm_id_priv->initiator_depth = param->initiator_depth; 1698 cm_id_priv->responder_resources = param->responder_resources; 1699 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1700 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1701 1702 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1703 return ret; 1704 } 1705 EXPORT_SYMBOL(ib_send_cm_rep); 1706 1707 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1708 struct cm_id_private *cm_id_priv, 1709 const void *private_data, 1710 u8 private_data_len) 1711 { 1712 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1713 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1714 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1715 1716 if (private_data && private_data_len) 1717 memcpy(rtu_msg->private_data, private_data, private_data_len); 1718 } 1719 1720 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1721 const void *private_data, 1722 u8 private_data_len) 1723 { 1724 struct cm_id_private *cm_id_priv; 1725 struct ib_mad_send_buf *msg; 1726 unsigned long flags; 1727 void *data; 1728 int ret; 1729 1730 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1731 return -EINVAL; 1732 1733 data = cm_copy_private_data(private_data, private_data_len); 1734 if (IS_ERR(data)) 1735 return PTR_ERR(data); 1736 1737 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1738 spin_lock_irqsave(&cm_id_priv->lock, flags); 1739 if (cm_id->state != IB_CM_REP_RCVD && 1740 cm_id->state != IB_CM_MRA_REP_SENT) { 1741 ret = -EINVAL; 1742 goto error; 1743 } 1744 1745 ret = cm_alloc_msg(cm_id_priv, &msg); 1746 if (ret) 1747 goto error; 1748 1749 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1750 private_data, private_data_len); 1751 1752 ret = ib_post_send_mad(msg, NULL); 1753 if (ret) { 1754 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1755 cm_free_msg(msg); 1756 kfree(data); 1757 return ret; 1758 } 1759 1760 cm_id->state = IB_CM_ESTABLISHED; 1761 cm_set_private_data(cm_id_priv, data, private_data_len); 1762 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1763 return 0; 1764 1765 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1766 kfree(data); 1767 return ret; 1768 } 1769 EXPORT_SYMBOL(ib_send_cm_rtu); 1770 1771 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1772 { 1773 struct cm_rep_msg *rep_msg; 1774 struct ib_cm_rep_event_param *param; 1775 1776 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1777 param = &work->cm_event.param.rep_rcvd; 1778 param->remote_ca_guid = rep_msg->local_ca_guid; 1779 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1780 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1781 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1782 param->responder_resources = rep_msg->initiator_depth; 1783 param->initiator_depth = rep_msg->resp_resources; 1784 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1785 param->failover_accepted = cm_rep_get_failover(rep_msg); 1786 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1787 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1788 param->srq = cm_rep_get_srq(rep_msg); 1789 work->cm_event.private_data = &rep_msg->private_data; 1790 } 1791 1792 static void cm_dup_rep_handler(struct cm_work *work) 1793 { 1794 struct cm_id_private *cm_id_priv; 1795 struct cm_rep_msg *rep_msg; 1796 struct ib_mad_send_buf *msg = NULL; 1797 int ret; 1798 1799 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1800 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1801 rep_msg->local_comm_id); 1802 if (!cm_id_priv) 1803 return; 1804 1805 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1806 counter[CM_REP_COUNTER]); 1807 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1808 if (ret) 1809 goto deref; 1810 1811 spin_lock_irq(&cm_id_priv->lock); 1812 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1813 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1814 cm_id_priv->private_data, 1815 cm_id_priv->private_data_len); 1816 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1817 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1818 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1819 cm_id_priv->private_data, 1820 cm_id_priv->private_data_len); 1821 else 1822 goto unlock; 1823 spin_unlock_irq(&cm_id_priv->lock); 1824 1825 ret = ib_post_send_mad(msg, NULL); 1826 if (ret) 1827 goto free; 1828 goto deref; 1829 1830 unlock: spin_unlock_irq(&cm_id_priv->lock); 1831 free: cm_free_msg(msg); 1832 deref: cm_deref_id(cm_id_priv); 1833 } 1834 1835 static int cm_rep_handler(struct cm_work *work) 1836 { 1837 struct cm_id_private *cm_id_priv; 1838 struct cm_rep_msg *rep_msg; 1839 int ret; 1840 1841 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1842 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1843 if (!cm_id_priv) { 1844 cm_dup_rep_handler(work); 1845 return -EINVAL; 1846 } 1847 1848 cm_format_rep_event(work, cm_id_priv->qp_type); 1849 1850 spin_lock_irq(&cm_id_priv->lock); 1851 switch (cm_id_priv->id.state) { 1852 case IB_CM_REQ_SENT: 1853 case IB_CM_MRA_REQ_RCVD: 1854 break; 1855 default: 1856 spin_unlock_irq(&cm_id_priv->lock); 1857 ret = -EINVAL; 1858 goto error; 1859 } 1860 1861 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1862 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1863 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1864 1865 spin_lock(&cm.lock); 1866 /* Check for duplicate REP. */ 1867 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1868 spin_unlock(&cm.lock); 1869 spin_unlock_irq(&cm_id_priv->lock); 1870 ret = -EINVAL; 1871 goto error; 1872 } 1873 /* Check for a stale connection. */ 1874 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1875 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1876 &cm.remote_id_table); 1877 cm_id_priv->timewait_info->inserted_remote_id = 0; 1878 spin_unlock(&cm.lock); 1879 spin_unlock_irq(&cm_id_priv->lock); 1880 cm_issue_rej(work->port, work->mad_recv_wc, 1881 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1882 NULL, 0); 1883 ret = -EINVAL; 1884 goto error; 1885 } 1886 spin_unlock(&cm.lock); 1887 1888 cm_id_priv->id.state = IB_CM_REP_RCVD; 1889 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1890 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1891 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1892 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1893 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1894 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1895 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1896 cm_id_priv->av.timeout = 1897 cm_ack_timeout(cm_id_priv->target_ack_delay, 1898 cm_id_priv->av.timeout - 1); 1899 cm_id_priv->alt_av.timeout = 1900 cm_ack_timeout(cm_id_priv->target_ack_delay, 1901 cm_id_priv->alt_av.timeout - 1); 1902 1903 /* todo: handle peer_to_peer */ 1904 1905 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1906 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1907 if (!ret) 1908 list_add_tail(&work->list, &cm_id_priv->work_list); 1909 spin_unlock_irq(&cm_id_priv->lock); 1910 1911 if (ret) 1912 cm_process_work(cm_id_priv, work); 1913 else 1914 cm_deref_id(cm_id_priv); 1915 return 0; 1916 1917 error: 1918 cm_deref_id(cm_id_priv); 1919 return ret; 1920 } 1921 1922 static int cm_establish_handler(struct cm_work *work) 1923 { 1924 struct cm_id_private *cm_id_priv; 1925 int ret; 1926 1927 /* See comment in cm_establish about lookup. */ 1928 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1929 if (!cm_id_priv) 1930 return -EINVAL; 1931 1932 spin_lock_irq(&cm_id_priv->lock); 1933 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 goto out; 1936 } 1937 1938 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1939 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1940 if (!ret) 1941 list_add_tail(&work->list, &cm_id_priv->work_list); 1942 spin_unlock_irq(&cm_id_priv->lock); 1943 1944 if (ret) 1945 cm_process_work(cm_id_priv, work); 1946 else 1947 cm_deref_id(cm_id_priv); 1948 return 0; 1949 out: 1950 cm_deref_id(cm_id_priv); 1951 return -EINVAL; 1952 } 1953 1954 static int cm_rtu_handler(struct cm_work *work) 1955 { 1956 struct cm_id_private *cm_id_priv; 1957 struct cm_rtu_msg *rtu_msg; 1958 int ret; 1959 1960 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1961 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1962 rtu_msg->local_comm_id); 1963 if (!cm_id_priv) 1964 return -EINVAL; 1965 1966 work->cm_event.private_data = &rtu_msg->private_data; 1967 1968 spin_lock_irq(&cm_id_priv->lock); 1969 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1970 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1971 spin_unlock_irq(&cm_id_priv->lock); 1972 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1973 counter[CM_RTU_COUNTER]); 1974 goto out; 1975 } 1976 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1977 1978 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1979 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1980 if (!ret) 1981 list_add_tail(&work->list, &cm_id_priv->work_list); 1982 spin_unlock_irq(&cm_id_priv->lock); 1983 1984 if (ret) 1985 cm_process_work(cm_id_priv, work); 1986 else 1987 cm_deref_id(cm_id_priv); 1988 return 0; 1989 out: 1990 cm_deref_id(cm_id_priv); 1991 return -EINVAL; 1992 } 1993 1994 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1995 struct cm_id_private *cm_id_priv, 1996 const void *private_data, 1997 u8 private_data_len) 1998 { 1999 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2000 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2001 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2002 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2003 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2004 2005 if (private_data && private_data_len) 2006 memcpy(dreq_msg->private_data, private_data, private_data_len); 2007 } 2008 2009 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2010 const void *private_data, 2011 u8 private_data_len) 2012 { 2013 struct cm_id_private *cm_id_priv; 2014 struct ib_mad_send_buf *msg; 2015 unsigned long flags; 2016 int ret; 2017 2018 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2019 return -EINVAL; 2020 2021 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2022 spin_lock_irqsave(&cm_id_priv->lock, flags); 2023 if (cm_id->state != IB_CM_ESTABLISHED) { 2024 ret = -EINVAL; 2025 goto out; 2026 } 2027 2028 if (cm_id->lap_state == IB_CM_LAP_SENT || 2029 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2030 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2031 2032 ret = cm_alloc_msg(cm_id_priv, &msg); 2033 if (ret) { 2034 cm_enter_timewait(cm_id_priv); 2035 goto out; 2036 } 2037 2038 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2039 private_data, private_data_len); 2040 msg->timeout_ms = cm_id_priv->timeout_ms; 2041 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2042 2043 ret = ib_post_send_mad(msg, NULL); 2044 if (ret) { 2045 cm_enter_timewait(cm_id_priv); 2046 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2047 cm_free_msg(msg); 2048 return ret; 2049 } 2050 2051 cm_id->state = IB_CM_DREQ_SENT; 2052 cm_id_priv->msg = msg; 2053 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2054 return ret; 2055 } 2056 EXPORT_SYMBOL(ib_send_cm_dreq); 2057 2058 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2059 struct cm_id_private *cm_id_priv, 2060 const void *private_data, 2061 u8 private_data_len) 2062 { 2063 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2064 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2065 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2066 2067 if (private_data && private_data_len) 2068 memcpy(drep_msg->private_data, private_data, private_data_len); 2069 } 2070 2071 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2072 const void *private_data, 2073 u8 private_data_len) 2074 { 2075 struct cm_id_private *cm_id_priv; 2076 struct ib_mad_send_buf *msg; 2077 unsigned long flags; 2078 void *data; 2079 int ret; 2080 2081 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2082 return -EINVAL; 2083 2084 data = cm_copy_private_data(private_data, private_data_len); 2085 if (IS_ERR(data)) 2086 return PTR_ERR(data); 2087 2088 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2089 spin_lock_irqsave(&cm_id_priv->lock, flags); 2090 if (cm_id->state != IB_CM_DREQ_RCVD) { 2091 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2092 kfree(data); 2093 return -EINVAL; 2094 } 2095 2096 cm_set_private_data(cm_id_priv, data, private_data_len); 2097 cm_enter_timewait(cm_id_priv); 2098 2099 ret = cm_alloc_msg(cm_id_priv, &msg); 2100 if (ret) 2101 goto out; 2102 2103 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2104 private_data, private_data_len); 2105 2106 ret = ib_post_send_mad(msg, NULL); 2107 if (ret) { 2108 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2109 cm_free_msg(msg); 2110 return ret; 2111 } 2112 2113 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2114 return ret; 2115 } 2116 EXPORT_SYMBOL(ib_send_cm_drep); 2117 2118 static int cm_issue_drep(struct cm_port *port, 2119 struct ib_mad_recv_wc *mad_recv_wc) 2120 { 2121 struct ib_mad_send_buf *msg = NULL; 2122 struct cm_dreq_msg *dreq_msg; 2123 struct cm_drep_msg *drep_msg; 2124 int ret; 2125 2126 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2127 if (ret) 2128 return ret; 2129 2130 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2131 drep_msg = (struct cm_drep_msg *) msg->mad; 2132 2133 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2134 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2135 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2136 2137 ret = ib_post_send_mad(msg, NULL); 2138 if (ret) 2139 cm_free_msg(msg); 2140 2141 return ret; 2142 } 2143 2144 static int cm_dreq_handler(struct cm_work *work) 2145 { 2146 struct cm_id_private *cm_id_priv; 2147 struct cm_dreq_msg *dreq_msg; 2148 struct ib_mad_send_buf *msg = NULL; 2149 int ret; 2150 2151 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2152 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2153 dreq_msg->local_comm_id); 2154 if (!cm_id_priv) { 2155 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2156 counter[CM_DREQ_COUNTER]); 2157 cm_issue_drep(work->port, work->mad_recv_wc); 2158 return -EINVAL; 2159 } 2160 2161 work->cm_event.private_data = &dreq_msg->private_data; 2162 2163 spin_lock_irq(&cm_id_priv->lock); 2164 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2165 goto unlock; 2166 2167 switch (cm_id_priv->id.state) { 2168 case IB_CM_REP_SENT: 2169 case IB_CM_DREQ_SENT: 2170 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2171 break; 2172 case IB_CM_ESTABLISHED: 2173 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2174 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2175 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2176 break; 2177 case IB_CM_MRA_REP_RCVD: 2178 break; 2179 case IB_CM_TIMEWAIT: 2180 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2181 counter[CM_DREQ_COUNTER]); 2182 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2183 goto unlock; 2184 2185 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2186 cm_id_priv->private_data, 2187 cm_id_priv->private_data_len); 2188 spin_unlock_irq(&cm_id_priv->lock); 2189 2190 if (ib_post_send_mad(msg, NULL)) 2191 cm_free_msg(msg); 2192 goto deref; 2193 case IB_CM_DREQ_RCVD: 2194 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2195 counter[CM_DREQ_COUNTER]); 2196 goto unlock; 2197 default: 2198 goto unlock; 2199 } 2200 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2201 cm_id_priv->tid = dreq_msg->hdr.tid; 2202 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2203 if (!ret) 2204 list_add_tail(&work->list, &cm_id_priv->work_list); 2205 spin_unlock_irq(&cm_id_priv->lock); 2206 2207 if (ret) 2208 cm_process_work(cm_id_priv, work); 2209 else 2210 cm_deref_id(cm_id_priv); 2211 return 0; 2212 2213 unlock: spin_unlock_irq(&cm_id_priv->lock); 2214 deref: cm_deref_id(cm_id_priv); 2215 return -EINVAL; 2216 } 2217 2218 static int cm_drep_handler(struct cm_work *work) 2219 { 2220 struct cm_id_private *cm_id_priv; 2221 struct cm_drep_msg *drep_msg; 2222 int ret; 2223 2224 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2225 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2226 drep_msg->local_comm_id); 2227 if (!cm_id_priv) 2228 return -EINVAL; 2229 2230 work->cm_event.private_data = &drep_msg->private_data; 2231 2232 spin_lock_irq(&cm_id_priv->lock); 2233 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2234 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2235 spin_unlock_irq(&cm_id_priv->lock); 2236 goto out; 2237 } 2238 cm_enter_timewait(cm_id_priv); 2239 2240 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2241 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2242 if (!ret) 2243 list_add_tail(&work->list, &cm_id_priv->work_list); 2244 spin_unlock_irq(&cm_id_priv->lock); 2245 2246 if (ret) 2247 cm_process_work(cm_id_priv, work); 2248 else 2249 cm_deref_id(cm_id_priv); 2250 return 0; 2251 out: 2252 cm_deref_id(cm_id_priv); 2253 return -EINVAL; 2254 } 2255 2256 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2257 enum ib_cm_rej_reason reason, 2258 void *ari, 2259 u8 ari_length, 2260 const void *private_data, 2261 u8 private_data_len) 2262 { 2263 struct cm_id_private *cm_id_priv; 2264 struct ib_mad_send_buf *msg; 2265 unsigned long flags; 2266 int ret; 2267 2268 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2269 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2270 return -EINVAL; 2271 2272 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2273 2274 spin_lock_irqsave(&cm_id_priv->lock, flags); 2275 switch (cm_id->state) { 2276 case IB_CM_REQ_SENT: 2277 case IB_CM_MRA_REQ_RCVD: 2278 case IB_CM_REQ_RCVD: 2279 case IB_CM_MRA_REQ_SENT: 2280 case IB_CM_REP_RCVD: 2281 case IB_CM_MRA_REP_SENT: 2282 ret = cm_alloc_msg(cm_id_priv, &msg); 2283 if (!ret) 2284 cm_format_rej((struct cm_rej_msg *) msg->mad, 2285 cm_id_priv, reason, ari, ari_length, 2286 private_data, private_data_len); 2287 2288 cm_reset_to_idle(cm_id_priv); 2289 break; 2290 case IB_CM_REP_SENT: 2291 case IB_CM_MRA_REP_RCVD: 2292 ret = cm_alloc_msg(cm_id_priv, &msg); 2293 if (!ret) 2294 cm_format_rej((struct cm_rej_msg *) msg->mad, 2295 cm_id_priv, reason, ari, ari_length, 2296 private_data, private_data_len); 2297 2298 cm_enter_timewait(cm_id_priv); 2299 break; 2300 default: 2301 ret = -EINVAL; 2302 goto out; 2303 } 2304 2305 if (ret) 2306 goto out; 2307 2308 ret = ib_post_send_mad(msg, NULL); 2309 if (ret) 2310 cm_free_msg(msg); 2311 2312 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2313 return ret; 2314 } 2315 EXPORT_SYMBOL(ib_send_cm_rej); 2316 2317 static void cm_format_rej_event(struct cm_work *work) 2318 { 2319 struct cm_rej_msg *rej_msg; 2320 struct ib_cm_rej_event_param *param; 2321 2322 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2323 param = &work->cm_event.param.rej_rcvd; 2324 param->ari = rej_msg->ari; 2325 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2326 param->reason = __be16_to_cpu(rej_msg->reason); 2327 work->cm_event.private_data = &rej_msg->private_data; 2328 } 2329 2330 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2331 { 2332 struct cm_timewait_info *timewait_info; 2333 struct cm_id_private *cm_id_priv; 2334 __be32 remote_id; 2335 2336 remote_id = rej_msg->local_comm_id; 2337 2338 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2339 spin_lock_irq(&cm.lock); 2340 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2341 remote_id); 2342 if (!timewait_info) { 2343 spin_unlock_irq(&cm.lock); 2344 return NULL; 2345 } 2346 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2347 (timewait_info->work.local_id ^ 2348 cm.random_id_operand)); 2349 if (cm_id_priv) { 2350 if (cm_id_priv->id.remote_id == remote_id) 2351 atomic_inc(&cm_id_priv->refcount); 2352 else 2353 cm_id_priv = NULL; 2354 } 2355 spin_unlock_irq(&cm.lock); 2356 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2357 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2358 else 2359 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2360 2361 return cm_id_priv; 2362 } 2363 2364 static int cm_rej_handler(struct cm_work *work) 2365 { 2366 struct cm_id_private *cm_id_priv; 2367 struct cm_rej_msg *rej_msg; 2368 int ret; 2369 2370 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2371 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2372 if (!cm_id_priv) 2373 return -EINVAL; 2374 2375 cm_format_rej_event(work); 2376 2377 spin_lock_irq(&cm_id_priv->lock); 2378 switch (cm_id_priv->id.state) { 2379 case IB_CM_REQ_SENT: 2380 case IB_CM_MRA_REQ_RCVD: 2381 case IB_CM_REP_SENT: 2382 case IB_CM_MRA_REP_RCVD: 2383 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2384 /* fall through */ 2385 case IB_CM_REQ_RCVD: 2386 case IB_CM_MRA_REQ_SENT: 2387 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2388 cm_enter_timewait(cm_id_priv); 2389 else 2390 cm_reset_to_idle(cm_id_priv); 2391 break; 2392 case IB_CM_DREQ_SENT: 2393 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2394 /* fall through */ 2395 case IB_CM_REP_RCVD: 2396 case IB_CM_MRA_REP_SENT: 2397 cm_enter_timewait(cm_id_priv); 2398 break; 2399 case IB_CM_ESTABLISHED: 2400 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2401 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2402 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2403 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2404 cm_id_priv->msg); 2405 cm_enter_timewait(cm_id_priv); 2406 break; 2407 } 2408 /* fall through */ 2409 default: 2410 spin_unlock_irq(&cm_id_priv->lock); 2411 ret = -EINVAL; 2412 goto out; 2413 } 2414 2415 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2416 if (!ret) 2417 list_add_tail(&work->list, &cm_id_priv->work_list); 2418 spin_unlock_irq(&cm_id_priv->lock); 2419 2420 if (ret) 2421 cm_process_work(cm_id_priv, work); 2422 else 2423 cm_deref_id(cm_id_priv); 2424 return 0; 2425 out: 2426 cm_deref_id(cm_id_priv); 2427 return -EINVAL; 2428 } 2429 2430 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2431 u8 service_timeout, 2432 const void *private_data, 2433 u8 private_data_len) 2434 { 2435 struct cm_id_private *cm_id_priv; 2436 struct ib_mad_send_buf *msg; 2437 enum ib_cm_state cm_state; 2438 enum ib_cm_lap_state lap_state; 2439 enum cm_msg_response msg_response; 2440 void *data; 2441 unsigned long flags; 2442 int ret; 2443 2444 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2445 return -EINVAL; 2446 2447 data = cm_copy_private_data(private_data, private_data_len); 2448 if (IS_ERR(data)) 2449 return PTR_ERR(data); 2450 2451 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2452 2453 spin_lock_irqsave(&cm_id_priv->lock, flags); 2454 switch(cm_id_priv->id.state) { 2455 case IB_CM_REQ_RCVD: 2456 cm_state = IB_CM_MRA_REQ_SENT; 2457 lap_state = cm_id->lap_state; 2458 msg_response = CM_MSG_RESPONSE_REQ; 2459 break; 2460 case IB_CM_REP_RCVD: 2461 cm_state = IB_CM_MRA_REP_SENT; 2462 lap_state = cm_id->lap_state; 2463 msg_response = CM_MSG_RESPONSE_REP; 2464 break; 2465 case IB_CM_ESTABLISHED: 2466 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2467 cm_state = cm_id->state; 2468 lap_state = IB_CM_MRA_LAP_SENT; 2469 msg_response = CM_MSG_RESPONSE_OTHER; 2470 break; 2471 } 2472 default: 2473 ret = -EINVAL; 2474 goto error1; 2475 } 2476 2477 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2478 ret = cm_alloc_msg(cm_id_priv, &msg); 2479 if (ret) 2480 goto error1; 2481 2482 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2483 msg_response, service_timeout, 2484 private_data, private_data_len); 2485 ret = ib_post_send_mad(msg, NULL); 2486 if (ret) 2487 goto error2; 2488 } 2489 2490 cm_id->state = cm_state; 2491 cm_id->lap_state = lap_state; 2492 cm_id_priv->service_timeout = service_timeout; 2493 cm_set_private_data(cm_id_priv, data, private_data_len); 2494 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2495 return 0; 2496 2497 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2498 kfree(data); 2499 return ret; 2500 2501 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2502 kfree(data); 2503 cm_free_msg(msg); 2504 return ret; 2505 } 2506 EXPORT_SYMBOL(ib_send_cm_mra); 2507 2508 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2509 { 2510 switch (cm_mra_get_msg_mraed(mra_msg)) { 2511 case CM_MSG_RESPONSE_REQ: 2512 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2513 case CM_MSG_RESPONSE_REP: 2514 case CM_MSG_RESPONSE_OTHER: 2515 return cm_acquire_id(mra_msg->remote_comm_id, 2516 mra_msg->local_comm_id); 2517 default: 2518 return NULL; 2519 } 2520 } 2521 2522 static int cm_mra_handler(struct cm_work *work) 2523 { 2524 struct cm_id_private *cm_id_priv; 2525 struct cm_mra_msg *mra_msg; 2526 int timeout, ret; 2527 2528 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2529 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2530 if (!cm_id_priv) 2531 return -EINVAL; 2532 2533 work->cm_event.private_data = &mra_msg->private_data; 2534 work->cm_event.param.mra_rcvd.service_timeout = 2535 cm_mra_get_service_timeout(mra_msg); 2536 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2537 cm_convert_to_ms(cm_id_priv->av.timeout); 2538 2539 spin_lock_irq(&cm_id_priv->lock); 2540 switch (cm_id_priv->id.state) { 2541 case IB_CM_REQ_SENT: 2542 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2543 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2544 cm_id_priv->msg, timeout)) 2545 goto out; 2546 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2547 break; 2548 case IB_CM_REP_SENT: 2549 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2550 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2551 cm_id_priv->msg, timeout)) 2552 goto out; 2553 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2554 break; 2555 case IB_CM_ESTABLISHED: 2556 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2557 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2558 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2559 cm_id_priv->msg, timeout)) { 2560 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2561 atomic_long_inc(&work->port-> 2562 counter_group[CM_RECV_DUPLICATES]. 2563 counter[CM_MRA_COUNTER]); 2564 goto out; 2565 } 2566 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2567 break; 2568 case IB_CM_MRA_REQ_RCVD: 2569 case IB_CM_MRA_REP_RCVD: 2570 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2571 counter[CM_MRA_COUNTER]); 2572 /* fall through */ 2573 default: 2574 goto out; 2575 } 2576 2577 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2578 cm_id_priv->id.state; 2579 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2580 if (!ret) 2581 list_add_tail(&work->list, &cm_id_priv->work_list); 2582 spin_unlock_irq(&cm_id_priv->lock); 2583 2584 if (ret) 2585 cm_process_work(cm_id_priv, work); 2586 else 2587 cm_deref_id(cm_id_priv); 2588 return 0; 2589 out: 2590 spin_unlock_irq(&cm_id_priv->lock); 2591 cm_deref_id(cm_id_priv); 2592 return -EINVAL; 2593 } 2594 2595 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2596 struct cm_id_private *cm_id_priv, 2597 struct ib_sa_path_rec *alternate_path, 2598 const void *private_data, 2599 u8 private_data_len) 2600 { 2601 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2602 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2603 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2604 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2605 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2606 /* todo: need remote CM response timeout */ 2607 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2608 lap_msg->alt_local_lid = alternate_path->slid; 2609 lap_msg->alt_remote_lid = alternate_path->dlid; 2610 lap_msg->alt_local_gid = alternate_path->sgid; 2611 lap_msg->alt_remote_gid = alternate_path->dgid; 2612 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2613 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2614 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2615 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2616 cm_lap_set_sl(lap_msg, alternate_path->sl); 2617 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2618 cm_lap_set_local_ack_timeout(lap_msg, 2619 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2620 alternate_path->packet_life_time)); 2621 2622 if (private_data && private_data_len) 2623 memcpy(lap_msg->private_data, private_data, private_data_len); 2624 } 2625 2626 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2627 struct ib_sa_path_rec *alternate_path, 2628 const void *private_data, 2629 u8 private_data_len) 2630 { 2631 struct cm_id_private *cm_id_priv; 2632 struct ib_mad_send_buf *msg; 2633 unsigned long flags; 2634 int ret; 2635 2636 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2637 return -EINVAL; 2638 2639 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2640 spin_lock_irqsave(&cm_id_priv->lock, flags); 2641 if (cm_id->state != IB_CM_ESTABLISHED || 2642 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2643 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2644 ret = -EINVAL; 2645 goto out; 2646 } 2647 2648 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2649 if (ret) 2650 goto out; 2651 cm_id_priv->alt_av.timeout = 2652 cm_ack_timeout(cm_id_priv->target_ack_delay, 2653 cm_id_priv->alt_av.timeout - 1); 2654 2655 ret = cm_alloc_msg(cm_id_priv, &msg); 2656 if (ret) 2657 goto out; 2658 2659 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2660 alternate_path, private_data, private_data_len); 2661 msg->timeout_ms = cm_id_priv->timeout_ms; 2662 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2663 2664 ret = ib_post_send_mad(msg, NULL); 2665 if (ret) { 2666 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2667 cm_free_msg(msg); 2668 return ret; 2669 } 2670 2671 cm_id->lap_state = IB_CM_LAP_SENT; 2672 cm_id_priv->msg = msg; 2673 2674 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2675 return ret; 2676 } 2677 EXPORT_SYMBOL(ib_send_cm_lap); 2678 2679 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2680 struct ib_sa_path_rec *path, 2681 struct cm_lap_msg *lap_msg) 2682 { 2683 memset(path, 0, sizeof *path); 2684 path->dgid = lap_msg->alt_local_gid; 2685 path->sgid = lap_msg->alt_remote_gid; 2686 path->dlid = lap_msg->alt_local_lid; 2687 path->slid = lap_msg->alt_remote_lid; 2688 path->flow_label = cm_lap_get_flow_label(lap_msg); 2689 path->hop_limit = lap_msg->alt_hop_limit; 2690 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2691 path->reversible = 1; 2692 path->pkey = cm_id_priv->pkey; 2693 path->sl = cm_lap_get_sl(lap_msg); 2694 path->mtu_selector = IB_SA_EQ; 2695 path->mtu = cm_id_priv->path_mtu; 2696 path->rate_selector = IB_SA_EQ; 2697 path->rate = cm_lap_get_packet_rate(lap_msg); 2698 path->packet_life_time_selector = IB_SA_EQ; 2699 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2700 path->packet_life_time -= (path->packet_life_time > 0); 2701 } 2702 2703 static int cm_lap_handler(struct cm_work *work) 2704 { 2705 struct cm_id_private *cm_id_priv; 2706 struct cm_lap_msg *lap_msg; 2707 struct ib_cm_lap_event_param *param; 2708 struct ib_mad_send_buf *msg = NULL; 2709 int ret; 2710 2711 /* todo: verify LAP request and send reject APR if invalid. */ 2712 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2713 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2714 lap_msg->local_comm_id); 2715 if (!cm_id_priv) 2716 return -EINVAL; 2717 2718 param = &work->cm_event.param.lap_rcvd; 2719 param->alternate_path = &work->path[0]; 2720 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2721 work->cm_event.private_data = &lap_msg->private_data; 2722 2723 spin_lock_irq(&cm_id_priv->lock); 2724 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2725 goto unlock; 2726 2727 switch (cm_id_priv->id.lap_state) { 2728 case IB_CM_LAP_UNINIT: 2729 case IB_CM_LAP_IDLE: 2730 break; 2731 case IB_CM_MRA_LAP_SENT: 2732 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2733 counter[CM_LAP_COUNTER]); 2734 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2735 goto unlock; 2736 2737 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2738 CM_MSG_RESPONSE_OTHER, 2739 cm_id_priv->service_timeout, 2740 cm_id_priv->private_data, 2741 cm_id_priv->private_data_len); 2742 spin_unlock_irq(&cm_id_priv->lock); 2743 2744 if (ib_post_send_mad(msg, NULL)) 2745 cm_free_msg(msg); 2746 goto deref; 2747 case IB_CM_LAP_RCVD: 2748 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2749 counter[CM_LAP_COUNTER]); 2750 goto unlock; 2751 default: 2752 goto unlock; 2753 } 2754 2755 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2756 cm_id_priv->tid = lap_msg->hdr.tid; 2757 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2758 work->mad_recv_wc->recv_buf.grh, 2759 &cm_id_priv->av); 2760 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2761 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2762 if (!ret) 2763 list_add_tail(&work->list, &cm_id_priv->work_list); 2764 spin_unlock_irq(&cm_id_priv->lock); 2765 2766 if (ret) 2767 cm_process_work(cm_id_priv, work); 2768 else 2769 cm_deref_id(cm_id_priv); 2770 return 0; 2771 2772 unlock: spin_unlock_irq(&cm_id_priv->lock); 2773 deref: cm_deref_id(cm_id_priv); 2774 return -EINVAL; 2775 } 2776 2777 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2778 struct cm_id_private *cm_id_priv, 2779 enum ib_cm_apr_status status, 2780 void *info, 2781 u8 info_length, 2782 const void *private_data, 2783 u8 private_data_len) 2784 { 2785 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2786 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2787 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2788 apr_msg->ap_status = (u8) status; 2789 2790 if (info && info_length) { 2791 apr_msg->info_length = info_length; 2792 memcpy(apr_msg->info, info, info_length); 2793 } 2794 2795 if (private_data && private_data_len) 2796 memcpy(apr_msg->private_data, private_data, private_data_len); 2797 } 2798 2799 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2800 enum ib_cm_apr_status status, 2801 void *info, 2802 u8 info_length, 2803 const void *private_data, 2804 u8 private_data_len) 2805 { 2806 struct cm_id_private *cm_id_priv; 2807 struct ib_mad_send_buf *msg; 2808 unsigned long flags; 2809 int ret; 2810 2811 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2812 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2813 return -EINVAL; 2814 2815 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2816 spin_lock_irqsave(&cm_id_priv->lock, flags); 2817 if (cm_id->state != IB_CM_ESTABLISHED || 2818 (cm_id->lap_state != IB_CM_LAP_RCVD && 2819 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2820 ret = -EINVAL; 2821 goto out; 2822 } 2823 2824 ret = cm_alloc_msg(cm_id_priv, &msg); 2825 if (ret) 2826 goto out; 2827 2828 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2829 info, info_length, private_data, private_data_len); 2830 ret = ib_post_send_mad(msg, NULL); 2831 if (ret) { 2832 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2833 cm_free_msg(msg); 2834 return ret; 2835 } 2836 2837 cm_id->lap_state = IB_CM_LAP_IDLE; 2838 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2839 return ret; 2840 } 2841 EXPORT_SYMBOL(ib_send_cm_apr); 2842 2843 static int cm_apr_handler(struct cm_work *work) 2844 { 2845 struct cm_id_private *cm_id_priv; 2846 struct cm_apr_msg *apr_msg; 2847 int ret; 2848 2849 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2850 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2851 apr_msg->local_comm_id); 2852 if (!cm_id_priv) 2853 return -EINVAL; /* Unmatched reply. */ 2854 2855 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2856 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2857 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2858 work->cm_event.private_data = &apr_msg->private_data; 2859 2860 spin_lock_irq(&cm_id_priv->lock); 2861 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2862 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2863 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2864 spin_unlock_irq(&cm_id_priv->lock); 2865 goto out; 2866 } 2867 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2868 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2869 cm_id_priv->msg = NULL; 2870 2871 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2872 if (!ret) 2873 list_add_tail(&work->list, &cm_id_priv->work_list); 2874 spin_unlock_irq(&cm_id_priv->lock); 2875 2876 if (ret) 2877 cm_process_work(cm_id_priv, work); 2878 else 2879 cm_deref_id(cm_id_priv); 2880 return 0; 2881 out: 2882 cm_deref_id(cm_id_priv); 2883 return -EINVAL; 2884 } 2885 2886 static int cm_timewait_handler(struct cm_work *work) 2887 { 2888 struct cm_timewait_info *timewait_info; 2889 struct cm_id_private *cm_id_priv; 2890 int ret; 2891 2892 timewait_info = (struct cm_timewait_info *)work; 2893 spin_lock_irq(&cm.lock); 2894 list_del(&timewait_info->list); 2895 spin_unlock_irq(&cm.lock); 2896 2897 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2898 timewait_info->work.remote_id); 2899 if (!cm_id_priv) 2900 return -EINVAL; 2901 2902 spin_lock_irq(&cm_id_priv->lock); 2903 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2904 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2905 spin_unlock_irq(&cm_id_priv->lock); 2906 goto out; 2907 } 2908 cm_id_priv->id.state = IB_CM_IDLE; 2909 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2910 if (!ret) 2911 list_add_tail(&work->list, &cm_id_priv->work_list); 2912 spin_unlock_irq(&cm_id_priv->lock); 2913 2914 if (ret) 2915 cm_process_work(cm_id_priv, work); 2916 else 2917 cm_deref_id(cm_id_priv); 2918 return 0; 2919 out: 2920 cm_deref_id(cm_id_priv); 2921 return -EINVAL; 2922 } 2923 2924 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2925 struct cm_id_private *cm_id_priv, 2926 struct ib_cm_sidr_req_param *param) 2927 { 2928 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2929 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2930 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2931 sidr_req_msg->pkey = param->path->pkey; 2932 sidr_req_msg->service_id = param->service_id; 2933 2934 if (param->private_data && param->private_data_len) 2935 memcpy(sidr_req_msg->private_data, param->private_data, 2936 param->private_data_len); 2937 } 2938 2939 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2940 struct ib_cm_sidr_req_param *param) 2941 { 2942 struct cm_id_private *cm_id_priv; 2943 struct ib_mad_send_buf *msg; 2944 unsigned long flags; 2945 int ret; 2946 2947 if (!param->path || (param->private_data && 2948 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2949 return -EINVAL; 2950 2951 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2952 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2953 if (ret) 2954 goto out; 2955 2956 cm_id->service_id = param->service_id; 2957 cm_id->service_mask = ~cpu_to_be64(0); 2958 cm_id_priv->timeout_ms = param->timeout_ms; 2959 cm_id_priv->max_cm_retries = param->max_cm_retries; 2960 ret = cm_alloc_msg(cm_id_priv, &msg); 2961 if (ret) 2962 goto out; 2963 2964 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2965 param); 2966 msg->timeout_ms = cm_id_priv->timeout_ms; 2967 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2968 2969 spin_lock_irqsave(&cm_id_priv->lock, flags); 2970 if (cm_id->state == IB_CM_IDLE) 2971 ret = ib_post_send_mad(msg, NULL); 2972 else 2973 ret = -EINVAL; 2974 2975 if (ret) { 2976 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2977 cm_free_msg(msg); 2978 goto out; 2979 } 2980 cm_id->state = IB_CM_SIDR_REQ_SENT; 2981 cm_id_priv->msg = msg; 2982 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2983 out: 2984 return ret; 2985 } 2986 EXPORT_SYMBOL(ib_send_cm_sidr_req); 2987 2988 static void cm_format_sidr_req_event(struct cm_work *work, 2989 struct ib_cm_id *listen_id) 2990 { 2991 struct cm_sidr_req_msg *sidr_req_msg; 2992 struct ib_cm_sidr_req_event_param *param; 2993 2994 sidr_req_msg = (struct cm_sidr_req_msg *) 2995 work->mad_recv_wc->recv_buf.mad; 2996 param = &work->cm_event.param.sidr_req_rcvd; 2997 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2998 param->listen_id = listen_id; 2999 param->port = work->port->port_num; 3000 work->cm_event.private_data = &sidr_req_msg->private_data; 3001 } 3002 3003 static int cm_sidr_req_handler(struct cm_work *work) 3004 { 3005 struct ib_cm_id *cm_id; 3006 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3007 struct cm_sidr_req_msg *sidr_req_msg; 3008 struct ib_wc *wc; 3009 3010 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3011 if (IS_ERR(cm_id)) 3012 return PTR_ERR(cm_id); 3013 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3014 3015 /* Record SGID/SLID and request ID for lookup. */ 3016 sidr_req_msg = (struct cm_sidr_req_msg *) 3017 work->mad_recv_wc->recv_buf.mad; 3018 wc = work->mad_recv_wc->wc; 3019 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3020 cm_id_priv->av.dgid.global.interface_id = 0; 3021 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3022 work->mad_recv_wc->recv_buf.grh, 3023 &cm_id_priv->av); 3024 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3025 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3026 atomic_inc(&cm_id_priv->work_count); 3027 3028 spin_lock_irq(&cm.lock); 3029 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3030 if (cur_cm_id_priv) { 3031 spin_unlock_irq(&cm.lock); 3032 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3033 counter[CM_SIDR_REQ_COUNTER]); 3034 goto out; /* Duplicate message. */ 3035 } 3036 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3037 cur_cm_id_priv = cm_find_listen(cm_id->device, 3038 sidr_req_msg->service_id, 3039 sidr_req_msg->private_data); 3040 if (!cur_cm_id_priv) { 3041 spin_unlock_irq(&cm.lock); 3042 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3043 goto out; /* No match. */ 3044 } 3045 atomic_inc(&cur_cm_id_priv->refcount); 3046 atomic_inc(&cm_id_priv->refcount); 3047 spin_unlock_irq(&cm.lock); 3048 3049 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3050 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3051 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3052 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3053 3054 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3055 cm_process_work(cm_id_priv, work); 3056 cm_deref_id(cur_cm_id_priv); 3057 return 0; 3058 out: 3059 ib_destroy_cm_id(&cm_id_priv->id); 3060 return -EINVAL; 3061 } 3062 3063 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3064 struct cm_id_private *cm_id_priv, 3065 struct ib_cm_sidr_rep_param *param) 3066 { 3067 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3068 cm_id_priv->tid); 3069 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3070 sidr_rep_msg->status = param->status; 3071 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3072 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3073 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3074 3075 if (param->info && param->info_length) 3076 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3077 3078 if (param->private_data && param->private_data_len) 3079 memcpy(sidr_rep_msg->private_data, param->private_data, 3080 param->private_data_len); 3081 } 3082 3083 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3084 struct ib_cm_sidr_rep_param *param) 3085 { 3086 struct cm_id_private *cm_id_priv; 3087 struct ib_mad_send_buf *msg; 3088 unsigned long flags; 3089 int ret; 3090 3091 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3092 (param->private_data && 3093 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3094 return -EINVAL; 3095 3096 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3097 spin_lock_irqsave(&cm_id_priv->lock, flags); 3098 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3099 ret = -EINVAL; 3100 goto error; 3101 } 3102 3103 ret = cm_alloc_msg(cm_id_priv, &msg); 3104 if (ret) 3105 goto error; 3106 3107 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3108 param); 3109 ret = ib_post_send_mad(msg, NULL); 3110 if (ret) { 3111 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3112 cm_free_msg(msg); 3113 return ret; 3114 } 3115 cm_id->state = IB_CM_IDLE; 3116 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3117 3118 spin_lock_irqsave(&cm.lock, flags); 3119 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3120 spin_unlock_irqrestore(&cm.lock, flags); 3121 return 0; 3122 3123 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3124 return ret; 3125 } 3126 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3127 3128 static void cm_format_sidr_rep_event(struct cm_work *work) 3129 { 3130 struct cm_sidr_rep_msg *sidr_rep_msg; 3131 struct ib_cm_sidr_rep_event_param *param; 3132 3133 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3134 work->mad_recv_wc->recv_buf.mad; 3135 param = &work->cm_event.param.sidr_rep_rcvd; 3136 param->status = sidr_rep_msg->status; 3137 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3138 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3139 param->info = &sidr_rep_msg->info; 3140 param->info_len = sidr_rep_msg->info_length; 3141 work->cm_event.private_data = &sidr_rep_msg->private_data; 3142 } 3143 3144 static int cm_sidr_rep_handler(struct cm_work *work) 3145 { 3146 struct cm_sidr_rep_msg *sidr_rep_msg; 3147 struct cm_id_private *cm_id_priv; 3148 3149 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3150 work->mad_recv_wc->recv_buf.mad; 3151 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3152 if (!cm_id_priv) 3153 return -EINVAL; /* Unmatched reply. */ 3154 3155 spin_lock_irq(&cm_id_priv->lock); 3156 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3157 spin_unlock_irq(&cm_id_priv->lock); 3158 goto out; 3159 } 3160 cm_id_priv->id.state = IB_CM_IDLE; 3161 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3162 spin_unlock_irq(&cm_id_priv->lock); 3163 3164 cm_format_sidr_rep_event(work); 3165 cm_process_work(cm_id_priv, work); 3166 return 0; 3167 out: 3168 cm_deref_id(cm_id_priv); 3169 return -EINVAL; 3170 } 3171 3172 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3173 enum ib_wc_status wc_status) 3174 { 3175 struct cm_id_private *cm_id_priv; 3176 struct ib_cm_event cm_event; 3177 enum ib_cm_state state; 3178 int ret; 3179 3180 memset(&cm_event, 0, sizeof cm_event); 3181 cm_id_priv = msg->context[0]; 3182 3183 /* Discard old sends or ones without a response. */ 3184 spin_lock_irq(&cm_id_priv->lock); 3185 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3186 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3187 goto discard; 3188 3189 switch (state) { 3190 case IB_CM_REQ_SENT: 3191 case IB_CM_MRA_REQ_RCVD: 3192 cm_reset_to_idle(cm_id_priv); 3193 cm_event.event = IB_CM_REQ_ERROR; 3194 break; 3195 case IB_CM_REP_SENT: 3196 case IB_CM_MRA_REP_RCVD: 3197 cm_reset_to_idle(cm_id_priv); 3198 cm_event.event = IB_CM_REP_ERROR; 3199 break; 3200 case IB_CM_DREQ_SENT: 3201 cm_enter_timewait(cm_id_priv); 3202 cm_event.event = IB_CM_DREQ_ERROR; 3203 break; 3204 case IB_CM_SIDR_REQ_SENT: 3205 cm_id_priv->id.state = IB_CM_IDLE; 3206 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3207 break; 3208 default: 3209 goto discard; 3210 } 3211 spin_unlock_irq(&cm_id_priv->lock); 3212 cm_event.param.send_status = wc_status; 3213 3214 /* No other events can occur on the cm_id at this point. */ 3215 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3216 cm_free_msg(msg); 3217 if (ret) 3218 ib_destroy_cm_id(&cm_id_priv->id); 3219 return; 3220 discard: 3221 spin_unlock_irq(&cm_id_priv->lock); 3222 cm_free_msg(msg); 3223 } 3224 3225 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3226 struct ib_mad_send_wc *mad_send_wc) 3227 { 3228 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3229 struct cm_port *port; 3230 u16 attr_index; 3231 3232 port = mad_agent->context; 3233 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3234 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3235 3236 /* 3237 * If the send was in response to a received message (context[0] is not 3238 * set to a cm_id), and is not a REJ, then it is a send that was 3239 * manually retried. 3240 */ 3241 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3242 msg->retries = 1; 3243 3244 atomic_long_add(1 + msg->retries, 3245 &port->counter_group[CM_XMIT].counter[attr_index]); 3246 if (msg->retries) 3247 atomic_long_add(msg->retries, 3248 &port->counter_group[CM_XMIT_RETRIES]. 3249 counter[attr_index]); 3250 3251 switch (mad_send_wc->status) { 3252 case IB_WC_SUCCESS: 3253 case IB_WC_WR_FLUSH_ERR: 3254 cm_free_msg(msg); 3255 break; 3256 default: 3257 if (msg->context[0] && msg->context[1]) 3258 cm_process_send_error(msg, mad_send_wc->status); 3259 else 3260 cm_free_msg(msg); 3261 break; 3262 } 3263 } 3264 3265 static void cm_work_handler(struct work_struct *_work) 3266 { 3267 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3268 int ret; 3269 3270 switch (work->cm_event.event) { 3271 case IB_CM_REQ_RECEIVED: 3272 ret = cm_req_handler(work); 3273 break; 3274 case IB_CM_MRA_RECEIVED: 3275 ret = cm_mra_handler(work); 3276 break; 3277 case IB_CM_REJ_RECEIVED: 3278 ret = cm_rej_handler(work); 3279 break; 3280 case IB_CM_REP_RECEIVED: 3281 ret = cm_rep_handler(work); 3282 break; 3283 case IB_CM_RTU_RECEIVED: 3284 ret = cm_rtu_handler(work); 3285 break; 3286 case IB_CM_USER_ESTABLISHED: 3287 ret = cm_establish_handler(work); 3288 break; 3289 case IB_CM_DREQ_RECEIVED: 3290 ret = cm_dreq_handler(work); 3291 break; 3292 case IB_CM_DREP_RECEIVED: 3293 ret = cm_drep_handler(work); 3294 break; 3295 case IB_CM_SIDR_REQ_RECEIVED: 3296 ret = cm_sidr_req_handler(work); 3297 break; 3298 case IB_CM_SIDR_REP_RECEIVED: 3299 ret = cm_sidr_rep_handler(work); 3300 break; 3301 case IB_CM_LAP_RECEIVED: 3302 ret = cm_lap_handler(work); 3303 break; 3304 case IB_CM_APR_RECEIVED: 3305 ret = cm_apr_handler(work); 3306 break; 3307 case IB_CM_TIMEWAIT_EXIT: 3308 ret = cm_timewait_handler(work); 3309 break; 3310 default: 3311 ret = -EINVAL; 3312 break; 3313 } 3314 if (ret) 3315 cm_free_work(work); 3316 } 3317 3318 static int cm_establish(struct ib_cm_id *cm_id) 3319 { 3320 struct cm_id_private *cm_id_priv; 3321 struct cm_work *work; 3322 unsigned long flags; 3323 int ret = 0; 3324 3325 work = kmalloc(sizeof *work, GFP_ATOMIC); 3326 if (!work) 3327 return -ENOMEM; 3328 3329 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3330 spin_lock_irqsave(&cm_id_priv->lock, flags); 3331 switch (cm_id->state) 3332 { 3333 case IB_CM_REP_SENT: 3334 case IB_CM_MRA_REP_RCVD: 3335 cm_id->state = IB_CM_ESTABLISHED; 3336 break; 3337 case IB_CM_ESTABLISHED: 3338 ret = -EISCONN; 3339 break; 3340 default: 3341 ret = -EINVAL; 3342 break; 3343 } 3344 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3345 3346 if (ret) { 3347 kfree(work); 3348 goto out; 3349 } 3350 3351 /* 3352 * The CM worker thread may try to destroy the cm_id before it 3353 * can execute this work item. To prevent potential deadlock, 3354 * we need to find the cm_id once we're in the context of the 3355 * worker thread, rather than holding a reference on it. 3356 */ 3357 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3358 work->local_id = cm_id->local_id; 3359 work->remote_id = cm_id->remote_id; 3360 work->mad_recv_wc = NULL; 3361 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3362 queue_delayed_work(cm.wq, &work->work, 0); 3363 out: 3364 return ret; 3365 } 3366 3367 static int cm_migrate(struct ib_cm_id *cm_id) 3368 { 3369 struct cm_id_private *cm_id_priv; 3370 unsigned long flags; 3371 int ret = 0; 3372 3373 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3374 spin_lock_irqsave(&cm_id_priv->lock, flags); 3375 if (cm_id->state == IB_CM_ESTABLISHED && 3376 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3377 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3378 cm_id->lap_state = IB_CM_LAP_IDLE; 3379 cm_id_priv->av = cm_id_priv->alt_av; 3380 } else 3381 ret = -EINVAL; 3382 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3383 3384 return ret; 3385 } 3386 3387 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3388 { 3389 int ret; 3390 3391 switch (event) { 3392 case IB_EVENT_COMM_EST: 3393 ret = cm_establish(cm_id); 3394 break; 3395 case IB_EVENT_PATH_MIG: 3396 ret = cm_migrate(cm_id); 3397 break; 3398 default: 3399 ret = -EINVAL; 3400 } 3401 return ret; 3402 } 3403 EXPORT_SYMBOL(ib_cm_notify); 3404 3405 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3406 struct ib_mad_recv_wc *mad_recv_wc) 3407 { 3408 struct cm_port *port = mad_agent->context; 3409 struct cm_work *work; 3410 enum ib_cm_event_type event; 3411 u16 attr_id; 3412 int paths = 0; 3413 3414 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3415 case CM_REQ_ATTR_ID: 3416 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3417 alt_local_lid != 0); 3418 event = IB_CM_REQ_RECEIVED; 3419 break; 3420 case CM_MRA_ATTR_ID: 3421 event = IB_CM_MRA_RECEIVED; 3422 break; 3423 case CM_REJ_ATTR_ID: 3424 event = IB_CM_REJ_RECEIVED; 3425 break; 3426 case CM_REP_ATTR_ID: 3427 event = IB_CM_REP_RECEIVED; 3428 break; 3429 case CM_RTU_ATTR_ID: 3430 event = IB_CM_RTU_RECEIVED; 3431 break; 3432 case CM_DREQ_ATTR_ID: 3433 event = IB_CM_DREQ_RECEIVED; 3434 break; 3435 case CM_DREP_ATTR_ID: 3436 event = IB_CM_DREP_RECEIVED; 3437 break; 3438 case CM_SIDR_REQ_ATTR_ID: 3439 event = IB_CM_SIDR_REQ_RECEIVED; 3440 break; 3441 case CM_SIDR_REP_ATTR_ID: 3442 event = IB_CM_SIDR_REP_RECEIVED; 3443 break; 3444 case CM_LAP_ATTR_ID: 3445 paths = 1; 3446 event = IB_CM_LAP_RECEIVED; 3447 break; 3448 case CM_APR_ATTR_ID: 3449 event = IB_CM_APR_RECEIVED; 3450 break; 3451 default: 3452 ib_free_recv_mad(mad_recv_wc); 3453 return; 3454 } 3455 3456 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3457 atomic_long_inc(&port->counter_group[CM_RECV]. 3458 counter[attr_id - CM_ATTR_ID_OFFSET]); 3459 3460 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3461 GFP_KERNEL); 3462 if (!work) { 3463 ib_free_recv_mad(mad_recv_wc); 3464 return; 3465 } 3466 3467 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3468 work->cm_event.event = event; 3469 work->mad_recv_wc = mad_recv_wc; 3470 work->port = port; 3471 queue_delayed_work(cm.wq, &work->work, 0); 3472 } 3473 3474 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3475 struct ib_qp_attr *qp_attr, 3476 int *qp_attr_mask) 3477 { 3478 unsigned long flags; 3479 int ret; 3480 3481 spin_lock_irqsave(&cm_id_priv->lock, flags); 3482 switch (cm_id_priv->id.state) { 3483 case IB_CM_REQ_SENT: 3484 case IB_CM_MRA_REQ_RCVD: 3485 case IB_CM_REQ_RCVD: 3486 case IB_CM_MRA_REQ_SENT: 3487 case IB_CM_REP_RCVD: 3488 case IB_CM_MRA_REP_SENT: 3489 case IB_CM_REP_SENT: 3490 case IB_CM_MRA_REP_RCVD: 3491 case IB_CM_ESTABLISHED: 3492 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3493 IB_QP_PKEY_INDEX | IB_QP_PORT; 3494 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3495 if (cm_id_priv->responder_resources) 3496 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3497 IB_ACCESS_REMOTE_ATOMIC; 3498 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3499 qp_attr->port_num = cm_id_priv->av.port->port_num; 3500 ret = 0; 3501 break; 3502 default: 3503 ret = -EINVAL; 3504 break; 3505 } 3506 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3507 return ret; 3508 } 3509 3510 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3511 struct ib_qp_attr *qp_attr, 3512 int *qp_attr_mask) 3513 { 3514 unsigned long flags; 3515 int ret; 3516 3517 spin_lock_irqsave(&cm_id_priv->lock, flags); 3518 switch (cm_id_priv->id.state) { 3519 case IB_CM_REQ_RCVD: 3520 case IB_CM_MRA_REQ_SENT: 3521 case IB_CM_REP_RCVD: 3522 case IB_CM_MRA_REP_SENT: 3523 case IB_CM_REP_SENT: 3524 case IB_CM_MRA_REP_RCVD: 3525 case IB_CM_ESTABLISHED: 3526 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3527 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3528 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3529 if (!cm_id_priv->av.valid) { 3530 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3531 return -EINVAL; 3532 } 3533 if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) { 3534 qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id; 3535 *qp_attr_mask |= IB_QP_VID; 3536 } 3537 if (!is_zero_ether_addr(cm_id_priv->av.smac)) { 3538 memcpy(qp_attr->smac, cm_id_priv->av.smac, 3539 sizeof(qp_attr->smac)); 3540 *qp_attr_mask |= IB_QP_SMAC; 3541 } 3542 if (cm_id_priv->alt_av.valid) { 3543 if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) { 3544 qp_attr->alt_vlan_id = 3545 cm_id_priv->alt_av.ah_attr.vlan_id; 3546 *qp_attr_mask |= IB_QP_ALT_VID; 3547 } 3548 if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) { 3549 memcpy(qp_attr->alt_smac, 3550 cm_id_priv->alt_av.smac, 3551 sizeof(qp_attr->alt_smac)); 3552 *qp_attr_mask |= IB_QP_ALT_SMAC; 3553 } 3554 } 3555 qp_attr->path_mtu = cm_id_priv->path_mtu; 3556 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3557 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3558 if (cm_id_priv->qp_type == IB_QPT_RC || 3559 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3560 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3561 IB_QP_MIN_RNR_TIMER; 3562 qp_attr->max_dest_rd_atomic = 3563 cm_id_priv->responder_resources; 3564 qp_attr->min_rnr_timer = 0; 3565 } 3566 if (cm_id_priv->alt_av.ah_attr.dlid) { 3567 *qp_attr_mask |= IB_QP_ALT_PATH; 3568 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3569 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3570 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3571 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3572 } 3573 ret = 0; 3574 break; 3575 default: 3576 ret = -EINVAL; 3577 break; 3578 } 3579 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3580 return ret; 3581 } 3582 3583 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3584 struct ib_qp_attr *qp_attr, 3585 int *qp_attr_mask) 3586 { 3587 unsigned long flags; 3588 int ret; 3589 3590 spin_lock_irqsave(&cm_id_priv->lock, flags); 3591 switch (cm_id_priv->id.state) { 3592 /* Allow transition to RTS before sending REP */ 3593 case IB_CM_REQ_RCVD: 3594 case IB_CM_MRA_REQ_SENT: 3595 3596 case IB_CM_REP_RCVD: 3597 case IB_CM_MRA_REP_SENT: 3598 case IB_CM_REP_SENT: 3599 case IB_CM_MRA_REP_RCVD: 3600 case IB_CM_ESTABLISHED: 3601 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3602 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3603 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3604 switch (cm_id_priv->qp_type) { 3605 case IB_QPT_RC: 3606 case IB_QPT_XRC_INI: 3607 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3608 IB_QP_MAX_QP_RD_ATOMIC; 3609 qp_attr->retry_cnt = cm_id_priv->retry_count; 3610 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3611 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3612 /* fall through */ 3613 case IB_QPT_XRC_TGT: 3614 *qp_attr_mask |= IB_QP_TIMEOUT; 3615 qp_attr->timeout = cm_id_priv->av.timeout; 3616 break; 3617 default: 3618 break; 3619 } 3620 if (cm_id_priv->alt_av.ah_attr.dlid) { 3621 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3622 qp_attr->path_mig_state = IB_MIG_REARM; 3623 } 3624 } else { 3625 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3626 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3627 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3628 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3629 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3630 qp_attr->path_mig_state = IB_MIG_REARM; 3631 } 3632 ret = 0; 3633 break; 3634 default: 3635 ret = -EINVAL; 3636 break; 3637 } 3638 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3639 return ret; 3640 } 3641 3642 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3643 struct ib_qp_attr *qp_attr, 3644 int *qp_attr_mask) 3645 { 3646 struct cm_id_private *cm_id_priv; 3647 int ret; 3648 3649 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3650 switch (qp_attr->qp_state) { 3651 case IB_QPS_INIT: 3652 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3653 break; 3654 case IB_QPS_RTR: 3655 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3656 break; 3657 case IB_QPS_RTS: 3658 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3659 break; 3660 default: 3661 ret = -EINVAL; 3662 break; 3663 } 3664 return ret; 3665 } 3666 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3667 3668 static void cm_get_ack_delay(struct cm_device *cm_dev) 3669 { 3670 struct ib_device_attr attr; 3671 3672 if (ib_query_device(cm_dev->ib_device, &attr)) 3673 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3674 else 3675 cm_dev->ack_delay = attr.local_ca_ack_delay; 3676 } 3677 3678 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3679 char *buf) 3680 { 3681 struct cm_counter_group *group; 3682 struct cm_counter_attribute *cm_attr; 3683 3684 group = container_of(obj, struct cm_counter_group, obj); 3685 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3686 3687 return sprintf(buf, "%ld\n", 3688 atomic_long_read(&group->counter[cm_attr->index])); 3689 } 3690 3691 static const struct sysfs_ops cm_counter_ops = { 3692 .show = cm_show_counter 3693 }; 3694 3695 static struct kobj_type cm_counter_obj_type = { 3696 .sysfs_ops = &cm_counter_ops, 3697 .default_attrs = cm_counter_default_attrs 3698 }; 3699 3700 static void cm_release_port_obj(struct kobject *obj) 3701 { 3702 struct cm_port *cm_port; 3703 3704 cm_port = container_of(obj, struct cm_port, port_obj); 3705 kfree(cm_port); 3706 } 3707 3708 static struct kobj_type cm_port_obj_type = { 3709 .release = cm_release_port_obj 3710 }; 3711 3712 static char *cm_devnode(struct device *dev, umode_t *mode) 3713 { 3714 if (mode) 3715 *mode = 0666; 3716 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3717 } 3718 3719 struct class cm_class = { 3720 .owner = THIS_MODULE, 3721 .name = "infiniband_cm", 3722 .devnode = cm_devnode, 3723 }; 3724 EXPORT_SYMBOL(cm_class); 3725 3726 static int cm_create_port_fs(struct cm_port *port) 3727 { 3728 int i, ret; 3729 3730 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3731 &port->cm_dev->device->kobj, 3732 "%d", port->port_num); 3733 if (ret) { 3734 kfree(port); 3735 return ret; 3736 } 3737 3738 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3739 ret = kobject_init_and_add(&port->counter_group[i].obj, 3740 &cm_counter_obj_type, 3741 &port->port_obj, 3742 "%s", counter_group_names[i]); 3743 if (ret) 3744 goto error; 3745 } 3746 3747 return 0; 3748 3749 error: 3750 while (i--) 3751 kobject_put(&port->counter_group[i].obj); 3752 kobject_put(&port->port_obj); 3753 return ret; 3754 3755 } 3756 3757 static void cm_remove_port_fs(struct cm_port *port) 3758 { 3759 int i; 3760 3761 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3762 kobject_put(&port->counter_group[i].obj); 3763 3764 kobject_put(&port->port_obj); 3765 } 3766 3767 static void cm_add_one(struct ib_device *ib_device) 3768 { 3769 struct cm_device *cm_dev; 3770 struct cm_port *port; 3771 struct ib_mad_reg_req reg_req = { 3772 .mgmt_class = IB_MGMT_CLASS_CM, 3773 .mgmt_class_version = IB_CM_CLASS_VERSION 3774 }; 3775 struct ib_port_modify port_modify = { 3776 .set_port_cap_mask = IB_PORT_CM_SUP 3777 }; 3778 unsigned long flags; 3779 int ret; 3780 u8 i; 3781 3782 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3783 return; 3784 3785 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3786 ib_device->phys_port_cnt, GFP_KERNEL); 3787 if (!cm_dev) 3788 return; 3789 3790 cm_dev->ib_device = ib_device; 3791 cm_get_ack_delay(cm_dev); 3792 3793 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3794 MKDEV(0, 0), NULL, 3795 "%s", ib_device->name); 3796 if (IS_ERR(cm_dev->device)) { 3797 kfree(cm_dev); 3798 return; 3799 } 3800 3801 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3802 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3803 port = kzalloc(sizeof *port, GFP_KERNEL); 3804 if (!port) 3805 goto error1; 3806 3807 cm_dev->port[i-1] = port; 3808 port->cm_dev = cm_dev; 3809 port->port_num = i; 3810 3811 ret = cm_create_port_fs(port); 3812 if (ret) 3813 goto error1; 3814 3815 port->mad_agent = ib_register_mad_agent(ib_device, i, 3816 IB_QPT_GSI, 3817 ®_req, 3818 0, 3819 cm_send_handler, 3820 cm_recv_handler, 3821 port); 3822 if (IS_ERR(port->mad_agent)) 3823 goto error2; 3824 3825 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3826 if (ret) 3827 goto error3; 3828 } 3829 ib_set_client_data(ib_device, &cm_client, cm_dev); 3830 3831 write_lock_irqsave(&cm.device_lock, flags); 3832 list_add_tail(&cm_dev->list, &cm.device_list); 3833 write_unlock_irqrestore(&cm.device_lock, flags); 3834 return; 3835 3836 error3: 3837 ib_unregister_mad_agent(port->mad_agent); 3838 error2: 3839 cm_remove_port_fs(port); 3840 error1: 3841 port_modify.set_port_cap_mask = 0; 3842 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3843 while (--i) { 3844 port = cm_dev->port[i-1]; 3845 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3846 ib_unregister_mad_agent(port->mad_agent); 3847 cm_remove_port_fs(port); 3848 } 3849 device_unregister(cm_dev->device); 3850 kfree(cm_dev); 3851 } 3852 3853 static void cm_remove_one(struct ib_device *ib_device) 3854 { 3855 struct cm_device *cm_dev; 3856 struct cm_port *port; 3857 struct ib_port_modify port_modify = { 3858 .clr_port_cap_mask = IB_PORT_CM_SUP 3859 }; 3860 unsigned long flags; 3861 int i; 3862 3863 cm_dev = ib_get_client_data(ib_device, &cm_client); 3864 if (!cm_dev) 3865 return; 3866 3867 write_lock_irqsave(&cm.device_lock, flags); 3868 list_del(&cm_dev->list); 3869 write_unlock_irqrestore(&cm.device_lock, flags); 3870 3871 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3872 port = cm_dev->port[i-1]; 3873 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3874 ib_unregister_mad_agent(port->mad_agent); 3875 flush_workqueue(cm.wq); 3876 cm_remove_port_fs(port); 3877 } 3878 device_unregister(cm_dev->device); 3879 kfree(cm_dev); 3880 } 3881 3882 static int __init ib_cm_init(void) 3883 { 3884 int ret; 3885 3886 memset(&cm, 0, sizeof cm); 3887 INIT_LIST_HEAD(&cm.device_list); 3888 rwlock_init(&cm.device_lock); 3889 spin_lock_init(&cm.lock); 3890 cm.listen_service_table = RB_ROOT; 3891 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3892 cm.remote_id_table = RB_ROOT; 3893 cm.remote_qp_table = RB_ROOT; 3894 cm.remote_sidr_table = RB_ROOT; 3895 idr_init(&cm.local_id_table); 3896 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3897 INIT_LIST_HEAD(&cm.timewait_list); 3898 3899 ret = class_register(&cm_class); 3900 if (ret) { 3901 ret = -ENOMEM; 3902 goto error1; 3903 } 3904 3905 cm.wq = create_workqueue("ib_cm"); 3906 if (!cm.wq) { 3907 ret = -ENOMEM; 3908 goto error2; 3909 } 3910 3911 ret = ib_register_client(&cm_client); 3912 if (ret) 3913 goto error3; 3914 3915 return 0; 3916 error3: 3917 destroy_workqueue(cm.wq); 3918 error2: 3919 class_unregister(&cm_class); 3920 error1: 3921 idr_destroy(&cm.local_id_table); 3922 return ret; 3923 } 3924 3925 static void __exit ib_cm_cleanup(void) 3926 { 3927 struct cm_timewait_info *timewait_info, *tmp; 3928 3929 spin_lock_irq(&cm.lock); 3930 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3931 cancel_delayed_work(&timewait_info->work.work); 3932 spin_unlock_irq(&cm.lock); 3933 3934 ib_unregister_client(&cm_client); 3935 destroy_workqueue(cm.wq); 3936 3937 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3938 list_del(&timewait_info->list); 3939 kfree(timewait_info); 3940 } 3941 3942 class_unregister(&cm_class); 3943 idr_destroy(&cm.local_id_table); 3944 } 3945 3946 module_init(ib_cm_init); 3947 module_exit(ib_cm_cleanup); 3948 3949