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