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 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $ 36 */ 37 38 #include <linux/completion.h> 39 #include <linux/dma-mapping.h> 40 #include <linux/device.h> 41 #include <linux/err.h> 42 #include <linux/idr.h> 43 #include <linux/interrupt.h> 44 #include <linux/random.h> 45 #include <linux/rbtree.h> 46 #include <linux/spinlock.h> 47 #include <linux/sysfs.h> 48 #include <linux/workqueue.h> 49 50 #include <rdma/ib_cache.h> 51 #include <rdma/ib_cm.h> 52 #include "cm_msgs.h" 53 54 MODULE_AUTHOR("Sean Hefty"); 55 MODULE_DESCRIPTION("InfiniBand CM"); 56 MODULE_LICENSE("Dual BSD/GPL"); 57 58 static void cm_add_one(struct ib_device *device); 59 static void cm_remove_one(struct ib_device *device); 60 61 static struct ib_client cm_client = { 62 .name = "cm", 63 .add = cm_add_one, 64 .remove = cm_remove_one 65 }; 66 67 static struct ib_cm { 68 spinlock_t lock; 69 struct list_head device_list; 70 rwlock_t device_lock; 71 struct rb_root listen_service_table; 72 u64 listen_service_id; 73 /* struct rb_root peer_service_table; todo: fix peer to peer */ 74 struct rb_root remote_qp_table; 75 struct rb_root remote_id_table; 76 struct rb_root remote_sidr_table; 77 struct idr local_id_table; 78 __be32 random_id_operand; 79 struct list_head timewait_list; 80 struct workqueue_struct *wq; 81 } cm; 82 83 /* Counter indexes ordered by attribute ID */ 84 enum { 85 CM_REQ_COUNTER, 86 CM_MRA_COUNTER, 87 CM_REJ_COUNTER, 88 CM_REP_COUNTER, 89 CM_RTU_COUNTER, 90 CM_DREQ_COUNTER, 91 CM_DREP_COUNTER, 92 CM_SIDR_REQ_COUNTER, 93 CM_SIDR_REP_COUNTER, 94 CM_LAP_COUNTER, 95 CM_APR_COUNTER, 96 CM_ATTR_COUNT, 97 CM_ATTR_ID_OFFSET = 0x0010, 98 }; 99 100 enum { 101 CM_XMIT, 102 CM_XMIT_RETRIES, 103 CM_RECV, 104 CM_RECV_DUPLICATES, 105 CM_COUNTER_GROUPS 106 }; 107 108 static char const counter_group_names[CM_COUNTER_GROUPS] 109 [sizeof("cm_rx_duplicates")] = { 110 "cm_tx_msgs", "cm_tx_retries", 111 "cm_rx_msgs", "cm_rx_duplicates" 112 }; 113 114 struct cm_counter_group { 115 struct kobject obj; 116 atomic_long_t counter[CM_ATTR_COUNT]; 117 }; 118 119 struct cm_counter_attribute { 120 struct attribute attr; 121 int index; 122 }; 123 124 #define CM_COUNTER_ATTR(_name, _index) \ 125 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 126 .attr = { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE }, \ 127 .index = _index \ 128 } 129 130 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 131 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 132 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 133 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 134 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 135 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 136 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 137 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 138 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 139 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 140 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 141 142 static struct attribute *cm_counter_default_attrs[] = { 143 &cm_req_counter_attr.attr, 144 &cm_mra_counter_attr.attr, 145 &cm_rej_counter_attr.attr, 146 &cm_rep_counter_attr.attr, 147 &cm_rtu_counter_attr.attr, 148 &cm_dreq_counter_attr.attr, 149 &cm_drep_counter_attr.attr, 150 &cm_sidr_req_counter_attr.attr, 151 &cm_sidr_rep_counter_attr.attr, 152 &cm_lap_counter_attr.attr, 153 &cm_apr_counter_attr.attr, 154 NULL 155 }; 156 157 struct cm_port { 158 struct cm_device *cm_dev; 159 struct ib_mad_agent *mad_agent; 160 struct kobject port_obj; 161 u8 port_num; 162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 163 }; 164 165 struct cm_device { 166 struct list_head list; 167 struct ib_device *device; 168 struct kobject dev_obj; 169 u8 ack_delay; 170 struct cm_port *port[0]; 171 }; 172 173 struct cm_av { 174 struct cm_port *port; 175 union ib_gid dgid; 176 struct ib_ah_attr ah_attr; 177 u16 pkey_index; 178 u8 timeout; 179 }; 180 181 struct cm_work { 182 struct delayed_work work; 183 struct list_head list; 184 struct cm_port *port; 185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 186 __be32 local_id; /* Established / timewait */ 187 __be32 remote_id; 188 struct ib_cm_event cm_event; 189 struct ib_sa_path_rec path[0]; 190 }; 191 192 struct cm_timewait_info { 193 struct cm_work work; /* Must be first. */ 194 struct list_head list; 195 struct rb_node remote_qp_node; 196 struct rb_node remote_id_node; 197 __be64 remote_ca_guid; 198 __be32 remote_qpn; 199 u8 inserted_remote_qp; 200 u8 inserted_remote_id; 201 }; 202 203 struct cm_id_private { 204 struct ib_cm_id id; 205 206 struct rb_node service_node; 207 struct rb_node sidr_id_node; 208 spinlock_t lock; /* Do not acquire inside cm.lock */ 209 struct completion comp; 210 atomic_t refcount; 211 212 struct ib_mad_send_buf *msg; 213 struct cm_timewait_info *timewait_info; 214 /* todo: use alternate port on send failure */ 215 struct cm_av av; 216 struct cm_av alt_av; 217 struct ib_cm_compare_data *compare_data; 218 219 void *private_data; 220 __be64 tid; 221 __be32 local_qpn; 222 __be32 remote_qpn; 223 enum ib_qp_type qp_type; 224 __be32 sq_psn; 225 __be32 rq_psn; 226 int timeout_ms; 227 enum ib_mtu path_mtu; 228 __be16 pkey; 229 u8 private_data_len; 230 u8 max_cm_retries; 231 u8 peer_to_peer; 232 u8 responder_resources; 233 u8 initiator_depth; 234 u8 retry_count; 235 u8 rnr_retry_count; 236 u8 service_timeout; 237 u8 target_ack_delay; 238 239 struct list_head work_list; 240 atomic_t work_count; 241 }; 242 243 static void cm_work_handler(struct work_struct *work); 244 245 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 246 { 247 if (atomic_dec_and_test(&cm_id_priv->refcount)) 248 complete(&cm_id_priv->comp); 249 } 250 251 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 252 struct ib_mad_send_buf **msg) 253 { 254 struct ib_mad_agent *mad_agent; 255 struct ib_mad_send_buf *m; 256 struct ib_ah *ah; 257 258 mad_agent = cm_id_priv->av.port->mad_agent; 259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 260 if (IS_ERR(ah)) 261 return PTR_ERR(ah); 262 263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 264 cm_id_priv->av.pkey_index, 265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 266 GFP_ATOMIC); 267 if (IS_ERR(m)) { 268 ib_destroy_ah(ah); 269 return PTR_ERR(m); 270 } 271 272 /* Timeout set by caller if response is expected. */ 273 m->ah = ah; 274 m->retries = cm_id_priv->max_cm_retries; 275 276 atomic_inc(&cm_id_priv->refcount); 277 m->context[0] = cm_id_priv; 278 *msg = m; 279 return 0; 280 } 281 282 static int cm_alloc_response_msg(struct cm_port *port, 283 struct ib_mad_recv_wc *mad_recv_wc, 284 struct ib_mad_send_buf **msg) 285 { 286 struct ib_mad_send_buf *m; 287 struct ib_ah *ah; 288 289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 290 mad_recv_wc->recv_buf.grh, port->port_num); 291 if (IS_ERR(ah)) 292 return PTR_ERR(ah); 293 294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 296 GFP_ATOMIC); 297 if (IS_ERR(m)) { 298 ib_destroy_ah(ah); 299 return PTR_ERR(m); 300 } 301 m->ah = ah; 302 *msg = m; 303 return 0; 304 } 305 306 static void cm_free_msg(struct ib_mad_send_buf *msg) 307 { 308 ib_destroy_ah(msg->ah); 309 if (msg->context[0]) 310 cm_deref_id(msg->context[0]); 311 ib_free_send_mad(msg); 312 } 313 314 static void * cm_copy_private_data(const void *private_data, 315 u8 private_data_len) 316 { 317 void *data; 318 319 if (!private_data || !private_data_len) 320 return NULL; 321 322 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 323 if (!data) 324 return ERR_PTR(-ENOMEM); 325 326 return data; 327 } 328 329 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 330 void *private_data, u8 private_data_len) 331 { 332 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 333 kfree(cm_id_priv->private_data); 334 335 cm_id_priv->private_data = private_data; 336 cm_id_priv->private_data_len = private_data_len; 337 } 338 339 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 340 struct ib_grh *grh, struct cm_av *av) 341 { 342 av->port = port; 343 av->pkey_index = wc->pkey_index; 344 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc, 345 grh, &av->ah_attr); 346 } 347 348 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 349 { 350 struct cm_device *cm_dev; 351 struct cm_port *port = NULL; 352 unsigned long flags; 353 int ret; 354 u8 p; 355 356 read_lock_irqsave(&cm.device_lock, flags); 357 list_for_each_entry(cm_dev, &cm.device_list, list) { 358 if (!ib_find_cached_gid(cm_dev->device, &path->sgid, 359 &p, NULL)) { 360 port = cm_dev->port[p-1]; 361 break; 362 } 363 } 364 read_unlock_irqrestore(&cm.device_lock, flags); 365 366 if (!port) 367 return -EINVAL; 368 369 ret = ib_find_cached_pkey(cm_dev->device, port->port_num, 370 be16_to_cpu(path->pkey), &av->pkey_index); 371 if (ret) 372 return ret; 373 374 av->port = port; 375 ib_init_ah_from_path(cm_dev->device, port->port_num, path, 376 &av->ah_attr); 377 av->timeout = path->packet_life_time + 1; 378 return 0; 379 } 380 381 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 382 { 383 unsigned long flags; 384 int ret, id; 385 static int next_id; 386 387 do { 388 spin_lock_irqsave(&cm.lock, flags); 389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 390 next_id, &id); 391 if (!ret) 392 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 393 spin_unlock_irqrestore(&cm.lock, flags); 394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 395 396 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand); 397 return ret; 398 } 399 400 static void cm_free_id(__be32 local_id) 401 { 402 spin_lock_irq(&cm.lock); 403 idr_remove(&cm.local_id_table, 404 (__force int) (local_id ^ cm.random_id_operand)); 405 spin_unlock_irq(&cm.lock); 406 } 407 408 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 409 { 410 struct cm_id_private *cm_id_priv; 411 412 cm_id_priv = idr_find(&cm.local_id_table, 413 (__force int) (local_id ^ cm.random_id_operand)); 414 if (cm_id_priv) { 415 if (cm_id_priv->id.remote_id == remote_id) 416 atomic_inc(&cm_id_priv->refcount); 417 else 418 cm_id_priv = NULL; 419 } 420 421 return cm_id_priv; 422 } 423 424 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 425 { 426 struct cm_id_private *cm_id_priv; 427 428 spin_lock_irq(&cm.lock); 429 cm_id_priv = cm_get_id(local_id, remote_id); 430 spin_unlock_irq(&cm.lock); 431 432 return cm_id_priv; 433 } 434 435 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 436 { 437 int i; 438 439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 441 ((unsigned long *) mask)[i]; 442 } 443 444 static int cm_compare_data(struct ib_cm_compare_data *src_data, 445 struct ib_cm_compare_data *dst_data) 446 { 447 u8 src[IB_CM_COMPARE_SIZE]; 448 u8 dst[IB_CM_COMPARE_SIZE]; 449 450 if (!src_data || !dst_data) 451 return 0; 452 453 cm_mask_copy(src, src_data->data, dst_data->mask); 454 cm_mask_copy(dst, dst_data->data, src_data->mask); 455 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 456 } 457 458 static int cm_compare_private_data(u8 *private_data, 459 struct ib_cm_compare_data *dst_data) 460 { 461 u8 src[IB_CM_COMPARE_SIZE]; 462 463 if (!dst_data) 464 return 0; 465 466 cm_mask_copy(src, private_data, dst_data->mask); 467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 468 } 469 470 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 471 { 472 struct rb_node **link = &cm.listen_service_table.rb_node; 473 struct rb_node *parent = NULL; 474 struct cm_id_private *cur_cm_id_priv; 475 __be64 service_id = cm_id_priv->id.service_id; 476 __be64 service_mask = cm_id_priv->id.service_mask; 477 int data_cmp; 478 479 while (*link) { 480 parent = *link; 481 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 482 service_node); 483 data_cmp = cm_compare_data(cm_id_priv->compare_data, 484 cur_cm_id_priv->compare_data); 485 if ((cur_cm_id_priv->id.service_mask & service_id) == 486 (service_mask & cur_cm_id_priv->id.service_id) && 487 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 488 !data_cmp) 489 return cur_cm_id_priv; 490 491 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 492 link = &(*link)->rb_left; 493 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 494 link = &(*link)->rb_right; 495 else if (service_id < cur_cm_id_priv->id.service_id) 496 link = &(*link)->rb_left; 497 else if (service_id > cur_cm_id_priv->id.service_id) 498 link = &(*link)->rb_right; 499 else if (data_cmp < 0) 500 link = &(*link)->rb_left; 501 else 502 link = &(*link)->rb_right; 503 } 504 rb_link_node(&cm_id_priv->service_node, parent, link); 505 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 506 return NULL; 507 } 508 509 static struct cm_id_private * cm_find_listen(struct ib_device *device, 510 __be64 service_id, 511 u8 *private_data) 512 { 513 struct rb_node *node = cm.listen_service_table.rb_node; 514 struct cm_id_private *cm_id_priv; 515 int data_cmp; 516 517 while (node) { 518 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 519 data_cmp = cm_compare_private_data(private_data, 520 cm_id_priv->compare_data); 521 if ((cm_id_priv->id.service_mask & service_id) == 522 cm_id_priv->id.service_id && 523 (cm_id_priv->id.device == device) && !data_cmp) 524 return cm_id_priv; 525 526 if (device < cm_id_priv->id.device) 527 node = node->rb_left; 528 else if (device > cm_id_priv->id.device) 529 node = node->rb_right; 530 else if (service_id < cm_id_priv->id.service_id) 531 node = node->rb_left; 532 else if (service_id > cm_id_priv->id.service_id) 533 node = node->rb_right; 534 else if (data_cmp < 0) 535 node = node->rb_left; 536 else 537 node = node->rb_right; 538 } 539 return NULL; 540 } 541 542 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 543 *timewait_info) 544 { 545 struct rb_node **link = &cm.remote_id_table.rb_node; 546 struct rb_node *parent = NULL; 547 struct cm_timewait_info *cur_timewait_info; 548 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 549 __be32 remote_id = timewait_info->work.remote_id; 550 551 while (*link) { 552 parent = *link; 553 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 554 remote_id_node); 555 if (remote_id < cur_timewait_info->work.remote_id) 556 link = &(*link)->rb_left; 557 else if (remote_id > cur_timewait_info->work.remote_id) 558 link = &(*link)->rb_right; 559 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 560 link = &(*link)->rb_left; 561 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 562 link = &(*link)->rb_right; 563 else 564 return cur_timewait_info; 565 } 566 timewait_info->inserted_remote_id = 1; 567 rb_link_node(&timewait_info->remote_id_node, parent, link); 568 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 569 return NULL; 570 } 571 572 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 573 __be32 remote_id) 574 { 575 struct rb_node *node = cm.remote_id_table.rb_node; 576 struct cm_timewait_info *timewait_info; 577 578 while (node) { 579 timewait_info = rb_entry(node, struct cm_timewait_info, 580 remote_id_node); 581 if (remote_id < timewait_info->work.remote_id) 582 node = node->rb_left; 583 else if (remote_id > timewait_info->work.remote_id) 584 node = node->rb_right; 585 else if (remote_ca_guid < timewait_info->remote_ca_guid) 586 node = node->rb_left; 587 else if (remote_ca_guid > timewait_info->remote_ca_guid) 588 node = node->rb_right; 589 else 590 return timewait_info; 591 } 592 return NULL; 593 } 594 595 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 596 *timewait_info) 597 { 598 struct rb_node **link = &cm.remote_qp_table.rb_node; 599 struct rb_node *parent = NULL; 600 struct cm_timewait_info *cur_timewait_info; 601 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 602 __be32 remote_qpn = timewait_info->remote_qpn; 603 604 while (*link) { 605 parent = *link; 606 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 607 remote_qp_node); 608 if (remote_qpn < cur_timewait_info->remote_qpn) 609 link = &(*link)->rb_left; 610 else if (remote_qpn > cur_timewait_info->remote_qpn) 611 link = &(*link)->rb_right; 612 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 613 link = &(*link)->rb_left; 614 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 615 link = &(*link)->rb_right; 616 else 617 return cur_timewait_info; 618 } 619 timewait_info->inserted_remote_qp = 1; 620 rb_link_node(&timewait_info->remote_qp_node, parent, link); 621 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 622 return NULL; 623 } 624 625 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 626 *cm_id_priv) 627 { 628 struct rb_node **link = &cm.remote_sidr_table.rb_node; 629 struct rb_node *parent = NULL; 630 struct cm_id_private *cur_cm_id_priv; 631 union ib_gid *port_gid = &cm_id_priv->av.dgid; 632 __be32 remote_id = cm_id_priv->id.remote_id; 633 634 while (*link) { 635 parent = *link; 636 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 637 sidr_id_node); 638 if (remote_id < cur_cm_id_priv->id.remote_id) 639 link = &(*link)->rb_left; 640 else if (remote_id > cur_cm_id_priv->id.remote_id) 641 link = &(*link)->rb_right; 642 else { 643 int cmp; 644 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 645 sizeof *port_gid); 646 if (cmp < 0) 647 link = &(*link)->rb_left; 648 else if (cmp > 0) 649 link = &(*link)->rb_right; 650 else 651 return cur_cm_id_priv; 652 } 653 } 654 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 655 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 656 return NULL; 657 } 658 659 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 660 enum ib_cm_sidr_status status) 661 { 662 struct ib_cm_sidr_rep_param param; 663 664 memset(¶m, 0, sizeof param); 665 param.status = status; 666 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 667 } 668 669 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 670 ib_cm_handler cm_handler, 671 void *context) 672 { 673 struct cm_id_private *cm_id_priv; 674 int ret; 675 676 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 677 if (!cm_id_priv) 678 return ERR_PTR(-ENOMEM); 679 680 cm_id_priv->id.state = IB_CM_IDLE; 681 cm_id_priv->id.device = device; 682 cm_id_priv->id.cm_handler = cm_handler; 683 cm_id_priv->id.context = context; 684 cm_id_priv->id.remote_cm_qpn = 1; 685 ret = cm_alloc_id(cm_id_priv); 686 if (ret) 687 goto error; 688 689 spin_lock_init(&cm_id_priv->lock); 690 init_completion(&cm_id_priv->comp); 691 INIT_LIST_HEAD(&cm_id_priv->work_list); 692 atomic_set(&cm_id_priv->work_count, -1); 693 atomic_set(&cm_id_priv->refcount, 1); 694 return &cm_id_priv->id; 695 696 error: 697 kfree(cm_id_priv); 698 return ERR_PTR(-ENOMEM); 699 } 700 EXPORT_SYMBOL(ib_create_cm_id); 701 702 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 703 { 704 struct cm_work *work; 705 706 if (list_empty(&cm_id_priv->work_list)) 707 return NULL; 708 709 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 710 list_del(&work->list); 711 return work; 712 } 713 714 static void cm_free_work(struct cm_work *work) 715 { 716 if (work->mad_recv_wc) 717 ib_free_recv_mad(work->mad_recv_wc); 718 kfree(work); 719 } 720 721 static inline int cm_convert_to_ms(int iba_time) 722 { 723 /* approximate conversion to ms from 4.096us x 2^iba_time */ 724 return 1 << max(iba_time - 8, 0); 725 } 726 727 /* 728 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 729 * Because of how ack_timeout is stored, adding one doubles the timeout. 730 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 731 * increment it (round up) only if the other is within 50%. 732 */ 733 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 734 { 735 int ack_timeout = packet_life_time + 1; 736 737 if (ack_timeout >= ca_ack_delay) 738 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 739 else 740 ack_timeout = ca_ack_delay + 741 (ack_timeout >= (ca_ack_delay - 1)); 742 743 return min(31, ack_timeout); 744 } 745 746 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 747 { 748 if (timewait_info->inserted_remote_id) { 749 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 750 timewait_info->inserted_remote_id = 0; 751 } 752 753 if (timewait_info->inserted_remote_qp) { 754 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 755 timewait_info->inserted_remote_qp = 0; 756 } 757 } 758 759 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 760 { 761 struct cm_timewait_info *timewait_info; 762 763 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 764 if (!timewait_info) 765 return ERR_PTR(-ENOMEM); 766 767 timewait_info->work.local_id = local_id; 768 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 769 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 770 return timewait_info; 771 } 772 773 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 774 { 775 int wait_time; 776 unsigned long flags; 777 778 spin_lock_irqsave(&cm.lock, flags); 779 cm_cleanup_timewait(cm_id_priv->timewait_info); 780 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 781 spin_unlock_irqrestore(&cm.lock, flags); 782 783 /* 784 * The cm_id could be destroyed by the user before we exit timewait. 785 * To protect against this, we search for the cm_id after exiting 786 * timewait before notifying the user that we've exited timewait. 787 */ 788 cm_id_priv->id.state = IB_CM_TIMEWAIT; 789 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 790 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 791 msecs_to_jiffies(wait_time)); 792 cm_id_priv->timewait_info = NULL; 793 } 794 795 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 796 { 797 unsigned long flags; 798 799 cm_id_priv->id.state = IB_CM_IDLE; 800 if (cm_id_priv->timewait_info) { 801 spin_lock_irqsave(&cm.lock, flags); 802 cm_cleanup_timewait(cm_id_priv->timewait_info); 803 spin_unlock_irqrestore(&cm.lock, flags); 804 kfree(cm_id_priv->timewait_info); 805 cm_id_priv->timewait_info = NULL; 806 } 807 } 808 809 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 810 { 811 struct cm_id_private *cm_id_priv; 812 struct cm_work *work; 813 814 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 815 retest: 816 spin_lock_irq(&cm_id_priv->lock); 817 switch (cm_id->state) { 818 case IB_CM_LISTEN: 819 cm_id->state = IB_CM_IDLE; 820 spin_unlock_irq(&cm_id_priv->lock); 821 spin_lock_irq(&cm.lock); 822 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 823 spin_unlock_irq(&cm.lock); 824 break; 825 case IB_CM_SIDR_REQ_SENT: 826 cm_id->state = IB_CM_IDLE; 827 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 828 spin_unlock_irq(&cm_id_priv->lock); 829 break; 830 case IB_CM_SIDR_REQ_RCVD: 831 spin_unlock_irq(&cm_id_priv->lock); 832 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 833 break; 834 case IB_CM_REQ_SENT: 835 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 836 spin_unlock_irq(&cm_id_priv->lock); 837 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 838 &cm_id_priv->id.device->node_guid, 839 sizeof cm_id_priv->id.device->node_guid, 840 NULL, 0); 841 break; 842 case IB_CM_REQ_RCVD: 843 if (err == -ENOMEM) { 844 /* Do not reject to allow future retries. */ 845 cm_reset_to_idle(cm_id_priv); 846 spin_unlock_irq(&cm_id_priv->lock); 847 } else { 848 spin_unlock_irq(&cm_id_priv->lock); 849 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 850 NULL, 0, NULL, 0); 851 } 852 break; 853 case IB_CM_MRA_REQ_RCVD: 854 case IB_CM_REP_SENT: 855 case IB_CM_MRA_REP_RCVD: 856 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 857 /* Fall through */ 858 case IB_CM_MRA_REQ_SENT: 859 case IB_CM_REP_RCVD: 860 case IB_CM_MRA_REP_SENT: 861 spin_unlock_irq(&cm_id_priv->lock); 862 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 863 NULL, 0, NULL, 0); 864 break; 865 case IB_CM_ESTABLISHED: 866 spin_unlock_irq(&cm_id_priv->lock); 867 ib_send_cm_dreq(cm_id, NULL, 0); 868 goto retest; 869 case IB_CM_DREQ_SENT: 870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 871 cm_enter_timewait(cm_id_priv); 872 spin_unlock_irq(&cm_id_priv->lock); 873 break; 874 case IB_CM_DREQ_RCVD: 875 spin_unlock_irq(&cm_id_priv->lock); 876 ib_send_cm_drep(cm_id, NULL, 0); 877 break; 878 default: 879 spin_unlock_irq(&cm_id_priv->lock); 880 break; 881 } 882 883 cm_free_id(cm_id->local_id); 884 cm_deref_id(cm_id_priv); 885 wait_for_completion(&cm_id_priv->comp); 886 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 887 cm_free_work(work); 888 kfree(cm_id_priv->compare_data); 889 kfree(cm_id_priv->private_data); 890 kfree(cm_id_priv); 891 } 892 893 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 894 { 895 cm_destroy_id(cm_id, 0); 896 } 897 EXPORT_SYMBOL(ib_destroy_cm_id); 898 899 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 900 struct ib_cm_compare_data *compare_data) 901 { 902 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 903 unsigned long flags; 904 int ret = 0; 905 906 service_mask = service_mask ? service_mask : 907 __constant_cpu_to_be64(~0ULL); 908 service_id &= service_mask; 909 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 910 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 911 return -EINVAL; 912 913 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 914 if (cm_id->state != IB_CM_IDLE) 915 return -EINVAL; 916 917 if (compare_data) { 918 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 919 GFP_KERNEL); 920 if (!cm_id_priv->compare_data) 921 return -ENOMEM; 922 cm_mask_copy(cm_id_priv->compare_data->data, 923 compare_data->data, compare_data->mask); 924 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 925 IB_CM_COMPARE_SIZE); 926 } 927 928 cm_id->state = IB_CM_LISTEN; 929 930 spin_lock_irqsave(&cm.lock, flags); 931 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 932 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 933 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 934 } else { 935 cm_id->service_id = service_id; 936 cm_id->service_mask = service_mask; 937 } 938 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 939 spin_unlock_irqrestore(&cm.lock, flags); 940 941 if (cur_cm_id_priv) { 942 cm_id->state = IB_CM_IDLE; 943 kfree(cm_id_priv->compare_data); 944 cm_id_priv->compare_data = NULL; 945 ret = -EBUSY; 946 } 947 return ret; 948 } 949 EXPORT_SYMBOL(ib_cm_listen); 950 951 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 952 enum cm_msg_sequence msg_seq) 953 { 954 u64 hi_tid, low_tid; 955 956 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 957 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 958 (msg_seq << 30)); 959 return cpu_to_be64(hi_tid | low_tid); 960 } 961 962 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 963 __be16 attr_id, __be64 tid) 964 { 965 hdr->base_version = IB_MGMT_BASE_VERSION; 966 hdr->mgmt_class = IB_MGMT_CLASS_CM; 967 hdr->class_version = IB_CM_CLASS_VERSION; 968 hdr->method = IB_MGMT_METHOD_SEND; 969 hdr->attr_id = attr_id; 970 hdr->tid = tid; 971 } 972 973 static void cm_format_req(struct cm_req_msg *req_msg, 974 struct cm_id_private *cm_id_priv, 975 struct ib_cm_req_param *param) 976 { 977 struct ib_sa_path_rec *pri_path = param->primary_path; 978 struct ib_sa_path_rec *alt_path = param->alternate_path; 979 980 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 981 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 982 983 req_msg->local_comm_id = cm_id_priv->id.local_id; 984 req_msg->service_id = param->service_id; 985 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 986 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 987 cm_req_set_resp_res(req_msg, param->responder_resources); 988 cm_req_set_init_depth(req_msg, param->initiator_depth); 989 cm_req_set_remote_resp_timeout(req_msg, 990 param->remote_cm_response_timeout); 991 cm_req_set_qp_type(req_msg, param->qp_type); 992 cm_req_set_flow_ctrl(req_msg, param->flow_control); 993 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 994 cm_req_set_local_resp_timeout(req_msg, 995 param->local_cm_response_timeout); 996 cm_req_set_retry_count(req_msg, param->retry_count); 997 req_msg->pkey = param->primary_path->pkey; 998 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 999 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1000 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1001 cm_req_set_srq(req_msg, param->srq); 1002 1003 if (pri_path->hop_limit <= 1) { 1004 req_msg->primary_local_lid = pri_path->slid; 1005 req_msg->primary_remote_lid = pri_path->dlid; 1006 } else { 1007 /* Work-around until there's a way to obtain remote LID info */ 1008 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1009 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1010 } 1011 req_msg->primary_local_gid = pri_path->sgid; 1012 req_msg->primary_remote_gid = pri_path->dgid; 1013 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1014 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1015 req_msg->primary_traffic_class = pri_path->traffic_class; 1016 req_msg->primary_hop_limit = pri_path->hop_limit; 1017 cm_req_set_primary_sl(req_msg, pri_path->sl); 1018 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1019 cm_req_set_primary_local_ack_timeout(req_msg, 1020 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1021 pri_path->packet_life_time)); 1022 1023 if (alt_path) { 1024 if (alt_path->hop_limit <= 1) { 1025 req_msg->alt_local_lid = alt_path->slid; 1026 req_msg->alt_remote_lid = alt_path->dlid; 1027 } else { 1028 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1029 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1030 } 1031 req_msg->alt_local_gid = alt_path->sgid; 1032 req_msg->alt_remote_gid = alt_path->dgid; 1033 cm_req_set_alt_flow_label(req_msg, 1034 alt_path->flow_label); 1035 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1036 req_msg->alt_traffic_class = alt_path->traffic_class; 1037 req_msg->alt_hop_limit = alt_path->hop_limit; 1038 cm_req_set_alt_sl(req_msg, alt_path->sl); 1039 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1040 cm_req_set_alt_local_ack_timeout(req_msg, 1041 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1042 alt_path->packet_life_time)); 1043 } 1044 1045 if (param->private_data && param->private_data_len) 1046 memcpy(req_msg->private_data, param->private_data, 1047 param->private_data_len); 1048 } 1049 1050 static int cm_validate_req_param(struct ib_cm_req_param *param) 1051 { 1052 /* peer-to-peer not supported */ 1053 if (param->peer_to_peer) 1054 return -EINVAL; 1055 1056 if (!param->primary_path) 1057 return -EINVAL; 1058 1059 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1060 return -EINVAL; 1061 1062 if (param->private_data && 1063 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1064 return -EINVAL; 1065 1066 if (param->alternate_path && 1067 (param->alternate_path->pkey != param->primary_path->pkey || 1068 param->alternate_path->mtu != param->primary_path->mtu)) 1069 return -EINVAL; 1070 1071 return 0; 1072 } 1073 1074 int ib_send_cm_req(struct ib_cm_id *cm_id, 1075 struct ib_cm_req_param *param) 1076 { 1077 struct cm_id_private *cm_id_priv; 1078 struct cm_req_msg *req_msg; 1079 unsigned long flags; 1080 int ret; 1081 1082 ret = cm_validate_req_param(param); 1083 if (ret) 1084 return ret; 1085 1086 /* Verify that we're not in timewait. */ 1087 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1088 spin_lock_irqsave(&cm_id_priv->lock, flags); 1089 if (cm_id->state != IB_CM_IDLE) { 1090 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1091 ret = -EINVAL; 1092 goto out; 1093 } 1094 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1095 1096 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1097 id.local_id); 1098 if (IS_ERR(cm_id_priv->timewait_info)) { 1099 ret = PTR_ERR(cm_id_priv->timewait_info); 1100 goto out; 1101 } 1102 1103 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1104 if (ret) 1105 goto error1; 1106 if (param->alternate_path) { 1107 ret = cm_init_av_by_path(param->alternate_path, 1108 &cm_id_priv->alt_av); 1109 if (ret) 1110 goto error1; 1111 } 1112 cm_id->service_id = param->service_id; 1113 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 1114 cm_id_priv->timeout_ms = cm_convert_to_ms( 1115 param->primary_path->packet_life_time) * 2 + 1116 cm_convert_to_ms( 1117 param->remote_cm_response_timeout); 1118 cm_id_priv->max_cm_retries = param->max_cm_retries; 1119 cm_id_priv->initiator_depth = param->initiator_depth; 1120 cm_id_priv->responder_resources = param->responder_resources; 1121 cm_id_priv->retry_count = param->retry_count; 1122 cm_id_priv->path_mtu = param->primary_path->mtu; 1123 cm_id_priv->pkey = param->primary_path->pkey; 1124 cm_id_priv->qp_type = param->qp_type; 1125 1126 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1127 if (ret) 1128 goto error1; 1129 1130 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1131 cm_format_req(req_msg, cm_id_priv, param); 1132 cm_id_priv->tid = req_msg->hdr.tid; 1133 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1134 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1135 1136 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1137 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1138 1139 spin_lock_irqsave(&cm_id_priv->lock, flags); 1140 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1141 if (ret) { 1142 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1143 goto error2; 1144 } 1145 BUG_ON(cm_id->state != IB_CM_IDLE); 1146 cm_id->state = IB_CM_REQ_SENT; 1147 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1148 return 0; 1149 1150 error2: cm_free_msg(cm_id_priv->msg); 1151 error1: kfree(cm_id_priv->timewait_info); 1152 out: return ret; 1153 } 1154 EXPORT_SYMBOL(ib_send_cm_req); 1155 1156 static int cm_issue_rej(struct cm_port *port, 1157 struct ib_mad_recv_wc *mad_recv_wc, 1158 enum ib_cm_rej_reason reason, 1159 enum cm_msg_response msg_rejected, 1160 void *ari, u8 ari_length) 1161 { 1162 struct ib_mad_send_buf *msg = NULL; 1163 struct cm_rej_msg *rej_msg, *rcv_msg; 1164 int ret; 1165 1166 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1167 if (ret) 1168 return ret; 1169 1170 /* We just need common CM header information. Cast to any message. */ 1171 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1172 rej_msg = (struct cm_rej_msg *) msg->mad; 1173 1174 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1175 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1176 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1177 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1178 rej_msg->reason = cpu_to_be16(reason); 1179 1180 if (ari && ari_length) { 1181 cm_rej_set_reject_info_len(rej_msg, ari_length); 1182 memcpy(rej_msg->ari, ari, ari_length); 1183 } 1184 1185 ret = ib_post_send_mad(msg, NULL); 1186 if (ret) 1187 cm_free_msg(msg); 1188 1189 return ret; 1190 } 1191 1192 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1193 __be32 local_qpn, __be32 remote_qpn) 1194 { 1195 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1196 ((local_ca_guid == remote_ca_guid) && 1197 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1198 } 1199 1200 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1201 struct ib_sa_path_rec *primary_path, 1202 struct ib_sa_path_rec *alt_path) 1203 { 1204 memset(primary_path, 0, sizeof *primary_path); 1205 primary_path->dgid = req_msg->primary_local_gid; 1206 primary_path->sgid = req_msg->primary_remote_gid; 1207 primary_path->dlid = req_msg->primary_local_lid; 1208 primary_path->slid = req_msg->primary_remote_lid; 1209 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1210 primary_path->hop_limit = req_msg->primary_hop_limit; 1211 primary_path->traffic_class = req_msg->primary_traffic_class; 1212 primary_path->reversible = 1; 1213 primary_path->pkey = req_msg->pkey; 1214 primary_path->sl = cm_req_get_primary_sl(req_msg); 1215 primary_path->mtu_selector = IB_SA_EQ; 1216 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1217 primary_path->rate_selector = IB_SA_EQ; 1218 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1219 primary_path->packet_life_time_selector = IB_SA_EQ; 1220 primary_path->packet_life_time = 1221 cm_req_get_primary_local_ack_timeout(req_msg); 1222 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1223 1224 if (req_msg->alt_local_lid) { 1225 memset(alt_path, 0, sizeof *alt_path); 1226 alt_path->dgid = req_msg->alt_local_gid; 1227 alt_path->sgid = req_msg->alt_remote_gid; 1228 alt_path->dlid = req_msg->alt_local_lid; 1229 alt_path->slid = req_msg->alt_remote_lid; 1230 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1231 alt_path->hop_limit = req_msg->alt_hop_limit; 1232 alt_path->traffic_class = req_msg->alt_traffic_class; 1233 alt_path->reversible = 1; 1234 alt_path->pkey = req_msg->pkey; 1235 alt_path->sl = cm_req_get_alt_sl(req_msg); 1236 alt_path->mtu_selector = IB_SA_EQ; 1237 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1238 alt_path->rate_selector = IB_SA_EQ; 1239 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1240 alt_path->packet_life_time_selector = IB_SA_EQ; 1241 alt_path->packet_life_time = 1242 cm_req_get_alt_local_ack_timeout(req_msg); 1243 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1244 } 1245 } 1246 1247 static void cm_format_req_event(struct cm_work *work, 1248 struct cm_id_private *cm_id_priv, 1249 struct ib_cm_id *listen_id) 1250 { 1251 struct cm_req_msg *req_msg; 1252 struct ib_cm_req_event_param *param; 1253 1254 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1255 param = &work->cm_event.param.req_rcvd; 1256 param->listen_id = listen_id; 1257 param->port = cm_id_priv->av.port->port_num; 1258 param->primary_path = &work->path[0]; 1259 if (req_msg->alt_local_lid) 1260 param->alternate_path = &work->path[1]; 1261 else 1262 param->alternate_path = NULL; 1263 param->remote_ca_guid = req_msg->local_ca_guid; 1264 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1265 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1266 param->qp_type = cm_req_get_qp_type(req_msg); 1267 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1268 param->responder_resources = cm_req_get_init_depth(req_msg); 1269 param->initiator_depth = cm_req_get_resp_res(req_msg); 1270 param->local_cm_response_timeout = 1271 cm_req_get_remote_resp_timeout(req_msg); 1272 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1273 param->remote_cm_response_timeout = 1274 cm_req_get_local_resp_timeout(req_msg); 1275 param->retry_count = cm_req_get_retry_count(req_msg); 1276 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1277 param->srq = cm_req_get_srq(req_msg); 1278 work->cm_event.private_data = &req_msg->private_data; 1279 } 1280 1281 static void cm_process_work(struct cm_id_private *cm_id_priv, 1282 struct cm_work *work) 1283 { 1284 int ret; 1285 1286 /* We will typically only have the current event to report. */ 1287 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1288 cm_free_work(work); 1289 1290 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1291 spin_lock_irq(&cm_id_priv->lock); 1292 work = cm_dequeue_work(cm_id_priv); 1293 spin_unlock_irq(&cm_id_priv->lock); 1294 BUG_ON(!work); 1295 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1296 &work->cm_event); 1297 cm_free_work(work); 1298 } 1299 cm_deref_id(cm_id_priv); 1300 if (ret) 1301 cm_destroy_id(&cm_id_priv->id, ret); 1302 } 1303 1304 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1305 struct cm_id_private *cm_id_priv, 1306 enum cm_msg_response msg_mraed, u8 service_timeout, 1307 const void *private_data, u8 private_data_len) 1308 { 1309 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1310 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1311 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1312 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1313 cm_mra_set_service_timeout(mra_msg, service_timeout); 1314 1315 if (private_data && private_data_len) 1316 memcpy(mra_msg->private_data, private_data, private_data_len); 1317 } 1318 1319 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1320 struct cm_id_private *cm_id_priv, 1321 enum ib_cm_rej_reason reason, 1322 void *ari, 1323 u8 ari_length, 1324 const void *private_data, 1325 u8 private_data_len) 1326 { 1327 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1328 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1329 1330 switch(cm_id_priv->id.state) { 1331 case IB_CM_REQ_RCVD: 1332 rej_msg->local_comm_id = 0; 1333 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1334 break; 1335 case IB_CM_MRA_REQ_SENT: 1336 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1337 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1338 break; 1339 case IB_CM_REP_RCVD: 1340 case IB_CM_MRA_REP_SENT: 1341 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1342 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1343 break; 1344 default: 1345 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1346 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1347 break; 1348 } 1349 1350 rej_msg->reason = cpu_to_be16(reason); 1351 if (ari && ari_length) { 1352 cm_rej_set_reject_info_len(rej_msg, ari_length); 1353 memcpy(rej_msg->ari, ari, ari_length); 1354 } 1355 1356 if (private_data && private_data_len) 1357 memcpy(rej_msg->private_data, private_data, private_data_len); 1358 } 1359 1360 static void cm_dup_req_handler(struct cm_work *work, 1361 struct cm_id_private *cm_id_priv) 1362 { 1363 struct ib_mad_send_buf *msg = NULL; 1364 int ret; 1365 1366 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1367 counter[CM_REQ_COUNTER]); 1368 1369 /* Quick state check to discard duplicate REQs. */ 1370 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1371 return; 1372 1373 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1374 if (ret) 1375 return; 1376 1377 spin_lock_irq(&cm_id_priv->lock); 1378 switch (cm_id_priv->id.state) { 1379 case IB_CM_MRA_REQ_SENT: 1380 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1381 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1382 cm_id_priv->private_data, 1383 cm_id_priv->private_data_len); 1384 break; 1385 case IB_CM_TIMEWAIT: 1386 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1387 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1388 break; 1389 default: 1390 goto unlock; 1391 } 1392 spin_unlock_irq(&cm_id_priv->lock); 1393 1394 ret = ib_post_send_mad(msg, NULL); 1395 if (ret) 1396 goto free; 1397 return; 1398 1399 unlock: spin_unlock_irq(&cm_id_priv->lock); 1400 free: cm_free_msg(msg); 1401 } 1402 1403 static struct cm_id_private * cm_match_req(struct cm_work *work, 1404 struct cm_id_private *cm_id_priv) 1405 { 1406 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1407 struct cm_timewait_info *timewait_info; 1408 struct cm_req_msg *req_msg; 1409 1410 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1411 1412 /* Check for possible duplicate REQ. */ 1413 spin_lock_irq(&cm.lock); 1414 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1415 if (timewait_info) { 1416 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1417 timewait_info->work.remote_id); 1418 spin_unlock_irq(&cm.lock); 1419 if (cur_cm_id_priv) { 1420 cm_dup_req_handler(work, cur_cm_id_priv); 1421 cm_deref_id(cur_cm_id_priv); 1422 } 1423 return NULL; 1424 } 1425 1426 /* Check for stale connections. */ 1427 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1428 if (timewait_info) { 1429 cm_cleanup_timewait(cm_id_priv->timewait_info); 1430 spin_unlock_irq(&cm.lock); 1431 cm_issue_rej(work->port, work->mad_recv_wc, 1432 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1433 NULL, 0); 1434 return NULL; 1435 } 1436 1437 /* Find matching listen request. */ 1438 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1439 req_msg->service_id, 1440 req_msg->private_data); 1441 if (!listen_cm_id_priv) { 1442 cm_cleanup_timewait(cm_id_priv->timewait_info); 1443 spin_unlock_irq(&cm.lock); 1444 cm_issue_rej(work->port, work->mad_recv_wc, 1445 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1446 NULL, 0); 1447 goto out; 1448 } 1449 atomic_inc(&listen_cm_id_priv->refcount); 1450 atomic_inc(&cm_id_priv->refcount); 1451 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1452 atomic_inc(&cm_id_priv->work_count); 1453 spin_unlock_irq(&cm.lock); 1454 out: 1455 return listen_cm_id_priv; 1456 } 1457 1458 /* 1459 * Work-around for inter-subnet connections. If the LIDs are permissive, 1460 * we need to override the LID/SL data in the REQ with the LID information 1461 * in the work completion. 1462 */ 1463 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1464 { 1465 if (!cm_req_get_primary_subnet_local(req_msg)) { 1466 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1467 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1468 cm_req_set_primary_sl(req_msg, wc->sl); 1469 } 1470 1471 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1472 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1473 } 1474 1475 if (!cm_req_get_alt_subnet_local(req_msg)) { 1476 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1477 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1478 cm_req_set_alt_sl(req_msg, wc->sl); 1479 } 1480 1481 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1482 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1483 } 1484 } 1485 1486 static int cm_req_handler(struct cm_work *work) 1487 { 1488 struct ib_cm_id *cm_id; 1489 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1490 struct cm_req_msg *req_msg; 1491 int ret; 1492 1493 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1494 1495 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1496 if (IS_ERR(cm_id)) 1497 return PTR_ERR(cm_id); 1498 1499 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1500 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1501 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1502 work->mad_recv_wc->recv_buf.grh, 1503 &cm_id_priv->av); 1504 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1505 id.local_id); 1506 if (IS_ERR(cm_id_priv->timewait_info)) { 1507 ret = PTR_ERR(cm_id_priv->timewait_info); 1508 goto destroy; 1509 } 1510 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1511 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1512 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1513 1514 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1515 if (!listen_cm_id_priv) { 1516 ret = -EINVAL; 1517 kfree(cm_id_priv->timewait_info); 1518 goto destroy; 1519 } 1520 1521 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1522 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1523 cm_id_priv->id.service_id = req_msg->service_id; 1524 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1525 1526 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1527 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1528 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1529 if (ret) { 1530 ib_get_cached_gid(work->port->cm_dev->device, 1531 work->port->port_num, 0, &work->path[0].sgid); 1532 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1533 &work->path[0].sgid, sizeof work->path[0].sgid, 1534 NULL, 0); 1535 goto rejected; 1536 } 1537 if (req_msg->alt_local_lid) { 1538 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1539 if (ret) { 1540 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1541 &work->path[0].sgid, 1542 sizeof work->path[0].sgid, NULL, 0); 1543 goto rejected; 1544 } 1545 } 1546 cm_id_priv->tid = req_msg->hdr.tid; 1547 cm_id_priv->timeout_ms = cm_convert_to_ms( 1548 cm_req_get_local_resp_timeout(req_msg)); 1549 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1550 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1551 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1552 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1553 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1554 cm_id_priv->pkey = req_msg->pkey; 1555 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1556 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1557 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1558 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1559 1560 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1561 cm_process_work(cm_id_priv, work); 1562 cm_deref_id(listen_cm_id_priv); 1563 return 0; 1564 1565 rejected: 1566 atomic_dec(&cm_id_priv->refcount); 1567 cm_deref_id(listen_cm_id_priv); 1568 destroy: 1569 ib_destroy_cm_id(cm_id); 1570 return ret; 1571 } 1572 1573 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1574 struct cm_id_private *cm_id_priv, 1575 struct ib_cm_rep_param *param) 1576 { 1577 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1578 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1579 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1580 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1581 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1582 rep_msg->resp_resources = param->responder_resources; 1583 rep_msg->initiator_depth = param->initiator_depth; 1584 cm_rep_set_target_ack_delay(rep_msg, 1585 cm_id_priv->av.port->cm_dev->ack_delay); 1586 cm_rep_set_failover(rep_msg, param->failover_accepted); 1587 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1588 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1589 cm_rep_set_srq(rep_msg, param->srq); 1590 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1591 1592 if (param->private_data && param->private_data_len) 1593 memcpy(rep_msg->private_data, param->private_data, 1594 param->private_data_len); 1595 } 1596 1597 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1598 struct ib_cm_rep_param *param) 1599 { 1600 struct cm_id_private *cm_id_priv; 1601 struct ib_mad_send_buf *msg; 1602 struct cm_rep_msg *rep_msg; 1603 unsigned long flags; 1604 int ret; 1605 1606 if (param->private_data && 1607 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1608 return -EINVAL; 1609 1610 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1611 spin_lock_irqsave(&cm_id_priv->lock, flags); 1612 if (cm_id->state != IB_CM_REQ_RCVD && 1613 cm_id->state != IB_CM_MRA_REQ_SENT) { 1614 ret = -EINVAL; 1615 goto out; 1616 } 1617 1618 ret = cm_alloc_msg(cm_id_priv, &msg); 1619 if (ret) 1620 goto out; 1621 1622 rep_msg = (struct cm_rep_msg *) msg->mad; 1623 cm_format_rep(rep_msg, cm_id_priv, param); 1624 msg->timeout_ms = cm_id_priv->timeout_ms; 1625 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1626 1627 ret = ib_post_send_mad(msg, NULL); 1628 if (ret) { 1629 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1630 cm_free_msg(msg); 1631 return ret; 1632 } 1633 1634 cm_id->state = IB_CM_REP_SENT; 1635 cm_id_priv->msg = msg; 1636 cm_id_priv->initiator_depth = param->initiator_depth; 1637 cm_id_priv->responder_resources = param->responder_resources; 1638 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1639 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1640 1641 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1642 return ret; 1643 } 1644 EXPORT_SYMBOL(ib_send_cm_rep); 1645 1646 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1647 struct cm_id_private *cm_id_priv, 1648 const void *private_data, 1649 u8 private_data_len) 1650 { 1651 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1652 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1653 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1654 1655 if (private_data && private_data_len) 1656 memcpy(rtu_msg->private_data, private_data, private_data_len); 1657 } 1658 1659 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1660 const void *private_data, 1661 u8 private_data_len) 1662 { 1663 struct cm_id_private *cm_id_priv; 1664 struct ib_mad_send_buf *msg; 1665 unsigned long flags; 1666 void *data; 1667 int ret; 1668 1669 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1670 return -EINVAL; 1671 1672 data = cm_copy_private_data(private_data, private_data_len); 1673 if (IS_ERR(data)) 1674 return PTR_ERR(data); 1675 1676 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1677 spin_lock_irqsave(&cm_id_priv->lock, flags); 1678 if (cm_id->state != IB_CM_REP_RCVD && 1679 cm_id->state != IB_CM_MRA_REP_SENT) { 1680 ret = -EINVAL; 1681 goto error; 1682 } 1683 1684 ret = cm_alloc_msg(cm_id_priv, &msg); 1685 if (ret) 1686 goto error; 1687 1688 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1689 private_data, private_data_len); 1690 1691 ret = ib_post_send_mad(msg, NULL); 1692 if (ret) { 1693 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1694 cm_free_msg(msg); 1695 kfree(data); 1696 return ret; 1697 } 1698 1699 cm_id->state = IB_CM_ESTABLISHED; 1700 cm_set_private_data(cm_id_priv, data, private_data_len); 1701 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1702 return 0; 1703 1704 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1705 kfree(data); 1706 return ret; 1707 } 1708 EXPORT_SYMBOL(ib_send_cm_rtu); 1709 1710 static void cm_format_rep_event(struct cm_work *work) 1711 { 1712 struct cm_rep_msg *rep_msg; 1713 struct ib_cm_rep_event_param *param; 1714 1715 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1716 param = &work->cm_event.param.rep_rcvd; 1717 param->remote_ca_guid = rep_msg->local_ca_guid; 1718 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1719 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1720 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1721 param->responder_resources = rep_msg->initiator_depth; 1722 param->initiator_depth = rep_msg->resp_resources; 1723 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1724 param->failover_accepted = cm_rep_get_failover(rep_msg); 1725 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1726 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1727 param->srq = cm_rep_get_srq(rep_msg); 1728 work->cm_event.private_data = &rep_msg->private_data; 1729 } 1730 1731 static void cm_dup_rep_handler(struct cm_work *work) 1732 { 1733 struct cm_id_private *cm_id_priv; 1734 struct cm_rep_msg *rep_msg; 1735 struct ib_mad_send_buf *msg = NULL; 1736 int ret; 1737 1738 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1739 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1740 rep_msg->local_comm_id); 1741 if (!cm_id_priv) 1742 return; 1743 1744 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1745 counter[CM_REP_COUNTER]); 1746 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1747 if (ret) 1748 goto deref; 1749 1750 spin_lock_irq(&cm_id_priv->lock); 1751 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1752 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1753 cm_id_priv->private_data, 1754 cm_id_priv->private_data_len); 1755 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1756 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1757 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1758 cm_id_priv->private_data, 1759 cm_id_priv->private_data_len); 1760 else 1761 goto unlock; 1762 spin_unlock_irq(&cm_id_priv->lock); 1763 1764 ret = ib_post_send_mad(msg, NULL); 1765 if (ret) 1766 goto free; 1767 goto deref; 1768 1769 unlock: spin_unlock_irq(&cm_id_priv->lock); 1770 free: cm_free_msg(msg); 1771 deref: cm_deref_id(cm_id_priv); 1772 } 1773 1774 static int cm_rep_handler(struct cm_work *work) 1775 { 1776 struct cm_id_private *cm_id_priv; 1777 struct cm_rep_msg *rep_msg; 1778 int ret; 1779 1780 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1781 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1782 if (!cm_id_priv) { 1783 cm_dup_rep_handler(work); 1784 return -EINVAL; 1785 } 1786 1787 cm_format_rep_event(work); 1788 1789 spin_lock_irq(&cm_id_priv->lock); 1790 switch (cm_id_priv->id.state) { 1791 case IB_CM_REQ_SENT: 1792 case IB_CM_MRA_REQ_RCVD: 1793 break; 1794 default: 1795 spin_unlock_irq(&cm_id_priv->lock); 1796 ret = -EINVAL; 1797 goto error; 1798 } 1799 1800 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1801 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1802 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1803 1804 spin_lock(&cm.lock); 1805 /* Check for duplicate REP. */ 1806 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1807 spin_unlock(&cm.lock); 1808 spin_unlock_irq(&cm_id_priv->lock); 1809 ret = -EINVAL; 1810 goto error; 1811 } 1812 /* Check for a stale connection. */ 1813 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1814 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1815 &cm.remote_id_table); 1816 cm_id_priv->timewait_info->inserted_remote_id = 0; 1817 spin_unlock(&cm.lock); 1818 spin_unlock_irq(&cm_id_priv->lock); 1819 cm_issue_rej(work->port, work->mad_recv_wc, 1820 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1821 NULL, 0); 1822 ret = -EINVAL; 1823 goto error; 1824 } 1825 spin_unlock(&cm.lock); 1826 1827 cm_id_priv->id.state = IB_CM_REP_RCVD; 1828 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1829 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1830 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1831 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1832 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1833 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1834 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1835 cm_id_priv->av.timeout = 1836 cm_ack_timeout(cm_id_priv->target_ack_delay, 1837 cm_id_priv->av.timeout - 1); 1838 cm_id_priv->alt_av.timeout = 1839 cm_ack_timeout(cm_id_priv->target_ack_delay, 1840 cm_id_priv->alt_av.timeout - 1); 1841 1842 /* todo: handle peer_to_peer */ 1843 1844 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1845 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1846 if (!ret) 1847 list_add_tail(&work->list, &cm_id_priv->work_list); 1848 spin_unlock_irq(&cm_id_priv->lock); 1849 1850 if (ret) 1851 cm_process_work(cm_id_priv, work); 1852 else 1853 cm_deref_id(cm_id_priv); 1854 return 0; 1855 1856 error: 1857 cm_deref_id(cm_id_priv); 1858 return ret; 1859 } 1860 1861 static int cm_establish_handler(struct cm_work *work) 1862 { 1863 struct cm_id_private *cm_id_priv; 1864 int ret; 1865 1866 /* See comment in cm_establish about lookup. */ 1867 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1868 if (!cm_id_priv) 1869 return -EINVAL; 1870 1871 spin_lock_irq(&cm_id_priv->lock); 1872 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1873 spin_unlock_irq(&cm_id_priv->lock); 1874 goto out; 1875 } 1876 1877 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1878 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1879 if (!ret) 1880 list_add_tail(&work->list, &cm_id_priv->work_list); 1881 spin_unlock_irq(&cm_id_priv->lock); 1882 1883 if (ret) 1884 cm_process_work(cm_id_priv, work); 1885 else 1886 cm_deref_id(cm_id_priv); 1887 return 0; 1888 out: 1889 cm_deref_id(cm_id_priv); 1890 return -EINVAL; 1891 } 1892 1893 static int cm_rtu_handler(struct cm_work *work) 1894 { 1895 struct cm_id_private *cm_id_priv; 1896 struct cm_rtu_msg *rtu_msg; 1897 int ret; 1898 1899 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1900 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1901 rtu_msg->local_comm_id); 1902 if (!cm_id_priv) 1903 return -EINVAL; 1904 1905 work->cm_event.private_data = &rtu_msg->private_data; 1906 1907 spin_lock_irq(&cm_id_priv->lock); 1908 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1909 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1910 spin_unlock_irq(&cm_id_priv->lock); 1911 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1912 counter[CM_RTU_COUNTER]); 1913 goto out; 1914 } 1915 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1916 1917 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1918 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1919 if (!ret) 1920 list_add_tail(&work->list, &cm_id_priv->work_list); 1921 spin_unlock_irq(&cm_id_priv->lock); 1922 1923 if (ret) 1924 cm_process_work(cm_id_priv, work); 1925 else 1926 cm_deref_id(cm_id_priv); 1927 return 0; 1928 out: 1929 cm_deref_id(cm_id_priv); 1930 return -EINVAL; 1931 } 1932 1933 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1934 struct cm_id_private *cm_id_priv, 1935 const void *private_data, 1936 u8 private_data_len) 1937 { 1938 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1939 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1940 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1941 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1942 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1943 1944 if (private_data && private_data_len) 1945 memcpy(dreq_msg->private_data, private_data, private_data_len); 1946 } 1947 1948 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1949 const void *private_data, 1950 u8 private_data_len) 1951 { 1952 struct cm_id_private *cm_id_priv; 1953 struct ib_mad_send_buf *msg; 1954 unsigned long flags; 1955 int ret; 1956 1957 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1958 return -EINVAL; 1959 1960 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1961 spin_lock_irqsave(&cm_id_priv->lock, flags); 1962 if (cm_id->state != IB_CM_ESTABLISHED) { 1963 ret = -EINVAL; 1964 goto out; 1965 } 1966 1967 ret = cm_alloc_msg(cm_id_priv, &msg); 1968 if (ret) { 1969 cm_enter_timewait(cm_id_priv); 1970 goto out; 1971 } 1972 1973 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1974 private_data, private_data_len); 1975 msg->timeout_ms = cm_id_priv->timeout_ms; 1976 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1977 1978 ret = ib_post_send_mad(msg, NULL); 1979 if (ret) { 1980 cm_enter_timewait(cm_id_priv); 1981 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1982 cm_free_msg(msg); 1983 return ret; 1984 } 1985 1986 cm_id->state = IB_CM_DREQ_SENT; 1987 cm_id_priv->msg = msg; 1988 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1989 return ret; 1990 } 1991 EXPORT_SYMBOL(ib_send_cm_dreq); 1992 1993 static void cm_format_drep(struct cm_drep_msg *drep_msg, 1994 struct cm_id_private *cm_id_priv, 1995 const void *private_data, 1996 u8 private_data_len) 1997 { 1998 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1999 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2000 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2001 2002 if (private_data && private_data_len) 2003 memcpy(drep_msg->private_data, private_data, private_data_len); 2004 } 2005 2006 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2007 const void *private_data, 2008 u8 private_data_len) 2009 { 2010 struct cm_id_private *cm_id_priv; 2011 struct ib_mad_send_buf *msg; 2012 unsigned long flags; 2013 void *data; 2014 int ret; 2015 2016 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2017 return -EINVAL; 2018 2019 data = cm_copy_private_data(private_data, private_data_len); 2020 if (IS_ERR(data)) 2021 return PTR_ERR(data); 2022 2023 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2024 spin_lock_irqsave(&cm_id_priv->lock, flags); 2025 if (cm_id->state != IB_CM_DREQ_RCVD) { 2026 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2027 kfree(data); 2028 return -EINVAL; 2029 } 2030 2031 cm_set_private_data(cm_id_priv, data, private_data_len); 2032 cm_enter_timewait(cm_id_priv); 2033 2034 ret = cm_alloc_msg(cm_id_priv, &msg); 2035 if (ret) 2036 goto out; 2037 2038 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2039 private_data, private_data_len); 2040 2041 ret = ib_post_send_mad(msg, NULL); 2042 if (ret) { 2043 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2044 cm_free_msg(msg); 2045 return ret; 2046 } 2047 2048 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2049 return ret; 2050 } 2051 EXPORT_SYMBOL(ib_send_cm_drep); 2052 2053 static int cm_issue_drep(struct cm_port *port, 2054 struct ib_mad_recv_wc *mad_recv_wc) 2055 { 2056 struct ib_mad_send_buf *msg = NULL; 2057 struct cm_dreq_msg *dreq_msg; 2058 struct cm_drep_msg *drep_msg; 2059 int ret; 2060 2061 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2062 if (ret) 2063 return ret; 2064 2065 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2066 drep_msg = (struct cm_drep_msg *) msg->mad; 2067 2068 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2069 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2070 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2071 2072 ret = ib_post_send_mad(msg, NULL); 2073 if (ret) 2074 cm_free_msg(msg); 2075 2076 return ret; 2077 } 2078 2079 static int cm_dreq_handler(struct cm_work *work) 2080 { 2081 struct cm_id_private *cm_id_priv; 2082 struct cm_dreq_msg *dreq_msg; 2083 struct ib_mad_send_buf *msg = NULL; 2084 int ret; 2085 2086 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2087 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2088 dreq_msg->local_comm_id); 2089 if (!cm_id_priv) { 2090 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2091 counter[CM_DREQ_COUNTER]); 2092 cm_issue_drep(work->port, work->mad_recv_wc); 2093 return -EINVAL; 2094 } 2095 2096 work->cm_event.private_data = &dreq_msg->private_data; 2097 2098 spin_lock_irq(&cm_id_priv->lock); 2099 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2100 goto unlock; 2101 2102 switch (cm_id_priv->id.state) { 2103 case IB_CM_REP_SENT: 2104 case IB_CM_DREQ_SENT: 2105 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2106 break; 2107 case IB_CM_ESTABLISHED: 2108 case IB_CM_MRA_REP_RCVD: 2109 break; 2110 case IB_CM_TIMEWAIT: 2111 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2112 counter[CM_DREQ_COUNTER]); 2113 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2114 goto unlock; 2115 2116 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2117 cm_id_priv->private_data, 2118 cm_id_priv->private_data_len); 2119 spin_unlock_irq(&cm_id_priv->lock); 2120 2121 if (ib_post_send_mad(msg, NULL)) 2122 cm_free_msg(msg); 2123 goto deref; 2124 case IB_CM_DREQ_RCVD: 2125 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2126 counter[CM_DREQ_COUNTER]); 2127 goto unlock; 2128 default: 2129 goto unlock; 2130 } 2131 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2132 cm_id_priv->tid = dreq_msg->hdr.tid; 2133 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2134 if (!ret) 2135 list_add_tail(&work->list, &cm_id_priv->work_list); 2136 spin_unlock_irq(&cm_id_priv->lock); 2137 2138 if (ret) 2139 cm_process_work(cm_id_priv, work); 2140 else 2141 cm_deref_id(cm_id_priv); 2142 return 0; 2143 2144 unlock: spin_unlock_irq(&cm_id_priv->lock); 2145 deref: cm_deref_id(cm_id_priv); 2146 return -EINVAL; 2147 } 2148 2149 static int cm_drep_handler(struct cm_work *work) 2150 { 2151 struct cm_id_private *cm_id_priv; 2152 struct cm_drep_msg *drep_msg; 2153 int ret; 2154 2155 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2156 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2157 drep_msg->local_comm_id); 2158 if (!cm_id_priv) 2159 return -EINVAL; 2160 2161 work->cm_event.private_data = &drep_msg->private_data; 2162 2163 spin_lock_irq(&cm_id_priv->lock); 2164 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2165 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2166 spin_unlock_irq(&cm_id_priv->lock); 2167 goto out; 2168 } 2169 cm_enter_timewait(cm_id_priv); 2170 2171 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2172 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2173 if (!ret) 2174 list_add_tail(&work->list, &cm_id_priv->work_list); 2175 spin_unlock_irq(&cm_id_priv->lock); 2176 2177 if (ret) 2178 cm_process_work(cm_id_priv, work); 2179 else 2180 cm_deref_id(cm_id_priv); 2181 return 0; 2182 out: 2183 cm_deref_id(cm_id_priv); 2184 return -EINVAL; 2185 } 2186 2187 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2188 enum ib_cm_rej_reason reason, 2189 void *ari, 2190 u8 ari_length, 2191 const void *private_data, 2192 u8 private_data_len) 2193 { 2194 struct cm_id_private *cm_id_priv; 2195 struct ib_mad_send_buf *msg; 2196 unsigned long flags; 2197 int ret; 2198 2199 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2200 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2201 return -EINVAL; 2202 2203 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2204 2205 spin_lock_irqsave(&cm_id_priv->lock, flags); 2206 switch (cm_id->state) { 2207 case IB_CM_REQ_SENT: 2208 case IB_CM_MRA_REQ_RCVD: 2209 case IB_CM_REQ_RCVD: 2210 case IB_CM_MRA_REQ_SENT: 2211 case IB_CM_REP_RCVD: 2212 case IB_CM_MRA_REP_SENT: 2213 ret = cm_alloc_msg(cm_id_priv, &msg); 2214 if (!ret) 2215 cm_format_rej((struct cm_rej_msg *) msg->mad, 2216 cm_id_priv, reason, ari, ari_length, 2217 private_data, private_data_len); 2218 2219 cm_reset_to_idle(cm_id_priv); 2220 break; 2221 case IB_CM_REP_SENT: 2222 case IB_CM_MRA_REP_RCVD: 2223 ret = cm_alloc_msg(cm_id_priv, &msg); 2224 if (!ret) 2225 cm_format_rej((struct cm_rej_msg *) msg->mad, 2226 cm_id_priv, reason, ari, ari_length, 2227 private_data, private_data_len); 2228 2229 cm_enter_timewait(cm_id_priv); 2230 break; 2231 default: 2232 ret = -EINVAL; 2233 goto out; 2234 } 2235 2236 if (ret) 2237 goto out; 2238 2239 ret = ib_post_send_mad(msg, NULL); 2240 if (ret) 2241 cm_free_msg(msg); 2242 2243 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2244 return ret; 2245 } 2246 EXPORT_SYMBOL(ib_send_cm_rej); 2247 2248 static void cm_format_rej_event(struct cm_work *work) 2249 { 2250 struct cm_rej_msg *rej_msg; 2251 struct ib_cm_rej_event_param *param; 2252 2253 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2254 param = &work->cm_event.param.rej_rcvd; 2255 param->ari = rej_msg->ari; 2256 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2257 param->reason = __be16_to_cpu(rej_msg->reason); 2258 work->cm_event.private_data = &rej_msg->private_data; 2259 } 2260 2261 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2262 { 2263 struct cm_timewait_info *timewait_info; 2264 struct cm_id_private *cm_id_priv; 2265 __be32 remote_id; 2266 2267 remote_id = rej_msg->local_comm_id; 2268 2269 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2270 spin_lock_irq(&cm.lock); 2271 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2272 remote_id); 2273 if (!timewait_info) { 2274 spin_unlock_irq(&cm.lock); 2275 return NULL; 2276 } 2277 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2278 (timewait_info->work.local_id ^ 2279 cm.random_id_operand)); 2280 if (cm_id_priv) { 2281 if (cm_id_priv->id.remote_id == remote_id) 2282 atomic_inc(&cm_id_priv->refcount); 2283 else 2284 cm_id_priv = NULL; 2285 } 2286 spin_unlock_irq(&cm.lock); 2287 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2288 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2289 else 2290 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2291 2292 return cm_id_priv; 2293 } 2294 2295 static int cm_rej_handler(struct cm_work *work) 2296 { 2297 struct cm_id_private *cm_id_priv; 2298 struct cm_rej_msg *rej_msg; 2299 int ret; 2300 2301 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2302 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2303 if (!cm_id_priv) 2304 return -EINVAL; 2305 2306 cm_format_rej_event(work); 2307 2308 spin_lock_irq(&cm_id_priv->lock); 2309 switch (cm_id_priv->id.state) { 2310 case IB_CM_REQ_SENT: 2311 case IB_CM_MRA_REQ_RCVD: 2312 case IB_CM_REP_SENT: 2313 case IB_CM_MRA_REP_RCVD: 2314 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2315 /* fall through */ 2316 case IB_CM_REQ_RCVD: 2317 case IB_CM_MRA_REQ_SENT: 2318 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2319 cm_enter_timewait(cm_id_priv); 2320 else 2321 cm_reset_to_idle(cm_id_priv); 2322 break; 2323 case IB_CM_DREQ_SENT: 2324 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2325 /* fall through */ 2326 case IB_CM_REP_RCVD: 2327 case IB_CM_MRA_REP_SENT: 2328 case IB_CM_ESTABLISHED: 2329 cm_enter_timewait(cm_id_priv); 2330 break; 2331 default: 2332 spin_unlock_irq(&cm_id_priv->lock); 2333 ret = -EINVAL; 2334 goto out; 2335 } 2336 2337 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2338 if (!ret) 2339 list_add_tail(&work->list, &cm_id_priv->work_list); 2340 spin_unlock_irq(&cm_id_priv->lock); 2341 2342 if (ret) 2343 cm_process_work(cm_id_priv, work); 2344 else 2345 cm_deref_id(cm_id_priv); 2346 return 0; 2347 out: 2348 cm_deref_id(cm_id_priv); 2349 return -EINVAL; 2350 } 2351 2352 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2353 u8 service_timeout, 2354 const void *private_data, 2355 u8 private_data_len) 2356 { 2357 struct cm_id_private *cm_id_priv; 2358 struct ib_mad_send_buf *msg; 2359 enum ib_cm_state cm_state; 2360 enum ib_cm_lap_state lap_state; 2361 enum cm_msg_response msg_response; 2362 void *data; 2363 unsigned long flags; 2364 int ret; 2365 2366 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2367 return -EINVAL; 2368 2369 data = cm_copy_private_data(private_data, private_data_len); 2370 if (IS_ERR(data)) 2371 return PTR_ERR(data); 2372 2373 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2374 2375 spin_lock_irqsave(&cm_id_priv->lock, flags); 2376 switch(cm_id_priv->id.state) { 2377 case IB_CM_REQ_RCVD: 2378 cm_state = IB_CM_MRA_REQ_SENT; 2379 lap_state = cm_id->lap_state; 2380 msg_response = CM_MSG_RESPONSE_REQ; 2381 break; 2382 case IB_CM_REP_RCVD: 2383 cm_state = IB_CM_MRA_REP_SENT; 2384 lap_state = cm_id->lap_state; 2385 msg_response = CM_MSG_RESPONSE_REP; 2386 break; 2387 case IB_CM_ESTABLISHED: 2388 cm_state = cm_id->state; 2389 lap_state = IB_CM_MRA_LAP_SENT; 2390 msg_response = CM_MSG_RESPONSE_OTHER; 2391 break; 2392 default: 2393 ret = -EINVAL; 2394 goto error1; 2395 } 2396 2397 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2398 ret = cm_alloc_msg(cm_id_priv, &msg); 2399 if (ret) 2400 goto error1; 2401 2402 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2403 msg_response, service_timeout, 2404 private_data, private_data_len); 2405 ret = ib_post_send_mad(msg, NULL); 2406 if (ret) 2407 goto error2; 2408 } 2409 2410 cm_id->state = cm_state; 2411 cm_id->lap_state = lap_state; 2412 cm_id_priv->service_timeout = service_timeout; 2413 cm_set_private_data(cm_id_priv, data, private_data_len); 2414 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2415 return 0; 2416 2417 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2418 kfree(data); 2419 return ret; 2420 2421 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2422 kfree(data); 2423 cm_free_msg(msg); 2424 return ret; 2425 } 2426 EXPORT_SYMBOL(ib_send_cm_mra); 2427 2428 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2429 { 2430 switch (cm_mra_get_msg_mraed(mra_msg)) { 2431 case CM_MSG_RESPONSE_REQ: 2432 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2433 case CM_MSG_RESPONSE_REP: 2434 case CM_MSG_RESPONSE_OTHER: 2435 return cm_acquire_id(mra_msg->remote_comm_id, 2436 mra_msg->local_comm_id); 2437 default: 2438 return NULL; 2439 } 2440 } 2441 2442 static int cm_mra_handler(struct cm_work *work) 2443 { 2444 struct cm_id_private *cm_id_priv; 2445 struct cm_mra_msg *mra_msg; 2446 int timeout, ret; 2447 2448 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2449 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2450 if (!cm_id_priv) 2451 return -EINVAL; 2452 2453 work->cm_event.private_data = &mra_msg->private_data; 2454 work->cm_event.param.mra_rcvd.service_timeout = 2455 cm_mra_get_service_timeout(mra_msg); 2456 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2457 cm_convert_to_ms(cm_id_priv->av.timeout); 2458 2459 spin_lock_irq(&cm_id_priv->lock); 2460 switch (cm_id_priv->id.state) { 2461 case IB_CM_REQ_SENT: 2462 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2463 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2464 cm_id_priv->msg, timeout)) 2465 goto out; 2466 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2467 break; 2468 case IB_CM_REP_SENT: 2469 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2470 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2471 cm_id_priv->msg, timeout)) 2472 goto out; 2473 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2474 break; 2475 case IB_CM_ESTABLISHED: 2476 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2477 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2478 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2479 cm_id_priv->msg, timeout)) { 2480 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2481 atomic_long_inc(&work->port-> 2482 counter_group[CM_RECV_DUPLICATES]. 2483 counter[CM_MRA_COUNTER]); 2484 goto out; 2485 } 2486 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2487 break; 2488 case IB_CM_MRA_REQ_RCVD: 2489 case IB_CM_MRA_REP_RCVD: 2490 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2491 counter[CM_MRA_COUNTER]); 2492 /* fall through */ 2493 default: 2494 goto out; 2495 } 2496 2497 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2498 cm_id_priv->id.state; 2499 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2500 if (!ret) 2501 list_add_tail(&work->list, &cm_id_priv->work_list); 2502 spin_unlock_irq(&cm_id_priv->lock); 2503 2504 if (ret) 2505 cm_process_work(cm_id_priv, work); 2506 else 2507 cm_deref_id(cm_id_priv); 2508 return 0; 2509 out: 2510 spin_unlock_irq(&cm_id_priv->lock); 2511 cm_deref_id(cm_id_priv); 2512 return -EINVAL; 2513 } 2514 2515 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2516 struct cm_id_private *cm_id_priv, 2517 struct ib_sa_path_rec *alternate_path, 2518 const void *private_data, 2519 u8 private_data_len) 2520 { 2521 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2522 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2523 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2524 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2525 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2526 /* todo: need remote CM response timeout */ 2527 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2528 lap_msg->alt_local_lid = alternate_path->slid; 2529 lap_msg->alt_remote_lid = alternate_path->dlid; 2530 lap_msg->alt_local_gid = alternate_path->sgid; 2531 lap_msg->alt_remote_gid = alternate_path->dgid; 2532 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2533 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2534 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2535 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2536 cm_lap_set_sl(lap_msg, alternate_path->sl); 2537 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2538 cm_lap_set_local_ack_timeout(lap_msg, 2539 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2540 alternate_path->packet_life_time)); 2541 2542 if (private_data && private_data_len) 2543 memcpy(lap_msg->private_data, private_data, private_data_len); 2544 } 2545 2546 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2547 struct ib_sa_path_rec *alternate_path, 2548 const void *private_data, 2549 u8 private_data_len) 2550 { 2551 struct cm_id_private *cm_id_priv; 2552 struct ib_mad_send_buf *msg; 2553 unsigned long flags; 2554 int ret; 2555 2556 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2557 return -EINVAL; 2558 2559 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2560 spin_lock_irqsave(&cm_id_priv->lock, flags); 2561 if (cm_id->state != IB_CM_ESTABLISHED || 2562 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2563 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2564 ret = -EINVAL; 2565 goto out; 2566 } 2567 2568 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2569 if (ret) 2570 goto out; 2571 cm_id_priv->alt_av.timeout = 2572 cm_ack_timeout(cm_id_priv->target_ack_delay, 2573 cm_id_priv->alt_av.timeout - 1); 2574 2575 ret = cm_alloc_msg(cm_id_priv, &msg); 2576 if (ret) 2577 goto out; 2578 2579 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2580 alternate_path, private_data, private_data_len); 2581 msg->timeout_ms = cm_id_priv->timeout_ms; 2582 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2583 2584 ret = ib_post_send_mad(msg, NULL); 2585 if (ret) { 2586 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2587 cm_free_msg(msg); 2588 return ret; 2589 } 2590 2591 cm_id->lap_state = IB_CM_LAP_SENT; 2592 cm_id_priv->msg = msg; 2593 2594 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2595 return ret; 2596 } 2597 EXPORT_SYMBOL(ib_send_cm_lap); 2598 2599 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2600 struct ib_sa_path_rec *path, 2601 struct cm_lap_msg *lap_msg) 2602 { 2603 memset(path, 0, sizeof *path); 2604 path->dgid = lap_msg->alt_local_gid; 2605 path->sgid = lap_msg->alt_remote_gid; 2606 path->dlid = lap_msg->alt_local_lid; 2607 path->slid = lap_msg->alt_remote_lid; 2608 path->flow_label = cm_lap_get_flow_label(lap_msg); 2609 path->hop_limit = lap_msg->alt_hop_limit; 2610 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2611 path->reversible = 1; 2612 path->pkey = cm_id_priv->pkey; 2613 path->sl = cm_lap_get_sl(lap_msg); 2614 path->mtu_selector = IB_SA_EQ; 2615 path->mtu = cm_id_priv->path_mtu; 2616 path->rate_selector = IB_SA_EQ; 2617 path->rate = cm_lap_get_packet_rate(lap_msg); 2618 path->packet_life_time_selector = IB_SA_EQ; 2619 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2620 path->packet_life_time -= (path->packet_life_time > 0); 2621 } 2622 2623 static int cm_lap_handler(struct cm_work *work) 2624 { 2625 struct cm_id_private *cm_id_priv; 2626 struct cm_lap_msg *lap_msg; 2627 struct ib_cm_lap_event_param *param; 2628 struct ib_mad_send_buf *msg = NULL; 2629 int ret; 2630 2631 /* todo: verify LAP request and send reject APR if invalid. */ 2632 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2633 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2634 lap_msg->local_comm_id); 2635 if (!cm_id_priv) 2636 return -EINVAL; 2637 2638 param = &work->cm_event.param.lap_rcvd; 2639 param->alternate_path = &work->path[0]; 2640 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2641 work->cm_event.private_data = &lap_msg->private_data; 2642 2643 spin_lock_irq(&cm_id_priv->lock); 2644 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2645 goto unlock; 2646 2647 switch (cm_id_priv->id.lap_state) { 2648 case IB_CM_LAP_UNINIT: 2649 case IB_CM_LAP_IDLE: 2650 break; 2651 case IB_CM_MRA_LAP_SENT: 2652 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2653 counter[CM_LAP_COUNTER]); 2654 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2655 goto unlock; 2656 2657 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2658 CM_MSG_RESPONSE_OTHER, 2659 cm_id_priv->service_timeout, 2660 cm_id_priv->private_data, 2661 cm_id_priv->private_data_len); 2662 spin_unlock_irq(&cm_id_priv->lock); 2663 2664 if (ib_post_send_mad(msg, NULL)) 2665 cm_free_msg(msg); 2666 goto deref; 2667 case IB_CM_LAP_RCVD: 2668 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2669 counter[CM_LAP_COUNTER]); 2670 goto unlock; 2671 default: 2672 goto unlock; 2673 } 2674 2675 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2676 cm_id_priv->tid = lap_msg->hdr.tid; 2677 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2678 work->mad_recv_wc->recv_buf.grh, 2679 &cm_id_priv->av); 2680 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2681 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2682 if (!ret) 2683 list_add_tail(&work->list, &cm_id_priv->work_list); 2684 spin_unlock_irq(&cm_id_priv->lock); 2685 2686 if (ret) 2687 cm_process_work(cm_id_priv, work); 2688 else 2689 cm_deref_id(cm_id_priv); 2690 return 0; 2691 2692 unlock: spin_unlock_irq(&cm_id_priv->lock); 2693 deref: cm_deref_id(cm_id_priv); 2694 return -EINVAL; 2695 } 2696 2697 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2698 struct cm_id_private *cm_id_priv, 2699 enum ib_cm_apr_status status, 2700 void *info, 2701 u8 info_length, 2702 const void *private_data, 2703 u8 private_data_len) 2704 { 2705 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2706 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2707 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2708 apr_msg->ap_status = (u8) status; 2709 2710 if (info && info_length) { 2711 apr_msg->info_length = info_length; 2712 memcpy(apr_msg->info, info, info_length); 2713 } 2714 2715 if (private_data && private_data_len) 2716 memcpy(apr_msg->private_data, private_data, private_data_len); 2717 } 2718 2719 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2720 enum ib_cm_apr_status status, 2721 void *info, 2722 u8 info_length, 2723 const void *private_data, 2724 u8 private_data_len) 2725 { 2726 struct cm_id_private *cm_id_priv; 2727 struct ib_mad_send_buf *msg; 2728 unsigned long flags; 2729 int ret; 2730 2731 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2732 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2733 return -EINVAL; 2734 2735 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2736 spin_lock_irqsave(&cm_id_priv->lock, flags); 2737 if (cm_id->state != IB_CM_ESTABLISHED || 2738 (cm_id->lap_state != IB_CM_LAP_RCVD && 2739 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2740 ret = -EINVAL; 2741 goto out; 2742 } 2743 2744 ret = cm_alloc_msg(cm_id_priv, &msg); 2745 if (ret) 2746 goto out; 2747 2748 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2749 info, info_length, private_data, private_data_len); 2750 ret = ib_post_send_mad(msg, NULL); 2751 if (ret) { 2752 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2753 cm_free_msg(msg); 2754 return ret; 2755 } 2756 2757 cm_id->lap_state = IB_CM_LAP_IDLE; 2758 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2759 return ret; 2760 } 2761 EXPORT_SYMBOL(ib_send_cm_apr); 2762 2763 static int cm_apr_handler(struct cm_work *work) 2764 { 2765 struct cm_id_private *cm_id_priv; 2766 struct cm_apr_msg *apr_msg; 2767 int ret; 2768 2769 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2770 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2771 apr_msg->local_comm_id); 2772 if (!cm_id_priv) 2773 return -EINVAL; /* Unmatched reply. */ 2774 2775 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2776 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2777 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2778 work->cm_event.private_data = &apr_msg->private_data; 2779 2780 spin_lock_irq(&cm_id_priv->lock); 2781 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2782 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2783 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2784 spin_unlock_irq(&cm_id_priv->lock); 2785 goto out; 2786 } 2787 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2788 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2789 cm_id_priv->msg = NULL; 2790 2791 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2792 if (!ret) 2793 list_add_tail(&work->list, &cm_id_priv->work_list); 2794 spin_unlock_irq(&cm_id_priv->lock); 2795 2796 if (ret) 2797 cm_process_work(cm_id_priv, work); 2798 else 2799 cm_deref_id(cm_id_priv); 2800 return 0; 2801 out: 2802 cm_deref_id(cm_id_priv); 2803 return -EINVAL; 2804 } 2805 2806 static int cm_timewait_handler(struct cm_work *work) 2807 { 2808 struct cm_timewait_info *timewait_info; 2809 struct cm_id_private *cm_id_priv; 2810 int ret; 2811 2812 timewait_info = (struct cm_timewait_info *)work; 2813 spin_lock_irq(&cm.lock); 2814 list_del(&timewait_info->list); 2815 spin_unlock_irq(&cm.lock); 2816 2817 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2818 timewait_info->work.remote_id); 2819 if (!cm_id_priv) 2820 return -EINVAL; 2821 2822 spin_lock_irq(&cm_id_priv->lock); 2823 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2824 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2825 spin_unlock_irq(&cm_id_priv->lock); 2826 goto out; 2827 } 2828 cm_id_priv->id.state = IB_CM_IDLE; 2829 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2830 if (!ret) 2831 list_add_tail(&work->list, &cm_id_priv->work_list); 2832 spin_unlock_irq(&cm_id_priv->lock); 2833 2834 if (ret) 2835 cm_process_work(cm_id_priv, work); 2836 else 2837 cm_deref_id(cm_id_priv); 2838 return 0; 2839 out: 2840 cm_deref_id(cm_id_priv); 2841 return -EINVAL; 2842 } 2843 2844 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2845 struct cm_id_private *cm_id_priv, 2846 struct ib_cm_sidr_req_param *param) 2847 { 2848 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2849 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2850 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2851 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey); 2852 sidr_req_msg->service_id = param->service_id; 2853 2854 if (param->private_data && param->private_data_len) 2855 memcpy(sidr_req_msg->private_data, param->private_data, 2856 param->private_data_len); 2857 } 2858 2859 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2860 struct ib_cm_sidr_req_param *param) 2861 { 2862 struct cm_id_private *cm_id_priv; 2863 struct ib_mad_send_buf *msg; 2864 unsigned long flags; 2865 int ret; 2866 2867 if (!param->path || (param->private_data && 2868 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2869 return -EINVAL; 2870 2871 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2872 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2873 if (ret) 2874 goto out; 2875 2876 cm_id->service_id = param->service_id; 2877 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2878 cm_id_priv->timeout_ms = param->timeout_ms; 2879 cm_id_priv->max_cm_retries = param->max_cm_retries; 2880 ret = cm_alloc_msg(cm_id_priv, &msg); 2881 if (ret) 2882 goto out; 2883 2884 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2885 param); 2886 msg->timeout_ms = cm_id_priv->timeout_ms; 2887 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2888 2889 spin_lock_irqsave(&cm_id_priv->lock, flags); 2890 if (cm_id->state == IB_CM_IDLE) 2891 ret = ib_post_send_mad(msg, NULL); 2892 else 2893 ret = -EINVAL; 2894 2895 if (ret) { 2896 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2897 cm_free_msg(msg); 2898 goto out; 2899 } 2900 cm_id->state = IB_CM_SIDR_REQ_SENT; 2901 cm_id_priv->msg = msg; 2902 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2903 out: 2904 return ret; 2905 } 2906 EXPORT_SYMBOL(ib_send_cm_sidr_req); 2907 2908 static void cm_format_sidr_req_event(struct cm_work *work, 2909 struct ib_cm_id *listen_id) 2910 { 2911 struct cm_sidr_req_msg *sidr_req_msg; 2912 struct ib_cm_sidr_req_event_param *param; 2913 2914 sidr_req_msg = (struct cm_sidr_req_msg *) 2915 work->mad_recv_wc->recv_buf.mad; 2916 param = &work->cm_event.param.sidr_req_rcvd; 2917 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2918 param->listen_id = listen_id; 2919 param->port = work->port->port_num; 2920 work->cm_event.private_data = &sidr_req_msg->private_data; 2921 } 2922 2923 static int cm_sidr_req_handler(struct cm_work *work) 2924 { 2925 struct ib_cm_id *cm_id; 2926 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2927 struct cm_sidr_req_msg *sidr_req_msg; 2928 struct ib_wc *wc; 2929 2930 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2931 if (IS_ERR(cm_id)) 2932 return PTR_ERR(cm_id); 2933 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2934 2935 /* Record SGID/SLID and request ID for lookup. */ 2936 sidr_req_msg = (struct cm_sidr_req_msg *) 2937 work->mad_recv_wc->recv_buf.mad; 2938 wc = work->mad_recv_wc->wc; 2939 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2940 cm_id_priv->av.dgid.global.interface_id = 0; 2941 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2942 work->mad_recv_wc->recv_buf.grh, 2943 &cm_id_priv->av); 2944 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2945 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2946 atomic_inc(&cm_id_priv->work_count); 2947 2948 spin_lock_irq(&cm.lock); 2949 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2950 if (cur_cm_id_priv) { 2951 spin_unlock_irq(&cm.lock); 2952 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2953 counter[CM_SIDR_REQ_COUNTER]); 2954 goto out; /* Duplicate message. */ 2955 } 2956 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2957 cur_cm_id_priv = cm_find_listen(cm_id->device, 2958 sidr_req_msg->service_id, 2959 sidr_req_msg->private_data); 2960 if (!cur_cm_id_priv) { 2961 spin_unlock_irq(&cm.lock); 2962 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2963 goto out; /* No match. */ 2964 } 2965 atomic_inc(&cur_cm_id_priv->refcount); 2966 spin_unlock_irq(&cm.lock); 2967 2968 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2969 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2970 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2971 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2972 2973 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2974 cm_process_work(cm_id_priv, work); 2975 cm_deref_id(cur_cm_id_priv); 2976 return 0; 2977 out: 2978 ib_destroy_cm_id(&cm_id_priv->id); 2979 return -EINVAL; 2980 } 2981 2982 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2983 struct cm_id_private *cm_id_priv, 2984 struct ib_cm_sidr_rep_param *param) 2985 { 2986 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2987 cm_id_priv->tid); 2988 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2989 sidr_rep_msg->status = param->status; 2990 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2991 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2992 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2993 2994 if (param->info && param->info_length) 2995 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2996 2997 if (param->private_data && param->private_data_len) 2998 memcpy(sidr_rep_msg->private_data, param->private_data, 2999 param->private_data_len); 3000 } 3001 3002 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3003 struct ib_cm_sidr_rep_param *param) 3004 { 3005 struct cm_id_private *cm_id_priv; 3006 struct ib_mad_send_buf *msg; 3007 unsigned long flags; 3008 int ret; 3009 3010 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3011 (param->private_data && 3012 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3013 return -EINVAL; 3014 3015 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3016 spin_lock_irqsave(&cm_id_priv->lock, flags); 3017 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3018 ret = -EINVAL; 3019 goto error; 3020 } 3021 3022 ret = cm_alloc_msg(cm_id_priv, &msg); 3023 if (ret) 3024 goto error; 3025 3026 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3027 param); 3028 ret = ib_post_send_mad(msg, NULL); 3029 if (ret) { 3030 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3031 cm_free_msg(msg); 3032 return ret; 3033 } 3034 cm_id->state = IB_CM_IDLE; 3035 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3036 3037 spin_lock_irqsave(&cm.lock, flags); 3038 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3039 spin_unlock_irqrestore(&cm.lock, flags); 3040 return 0; 3041 3042 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3043 return ret; 3044 } 3045 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3046 3047 static void cm_format_sidr_rep_event(struct cm_work *work) 3048 { 3049 struct cm_sidr_rep_msg *sidr_rep_msg; 3050 struct ib_cm_sidr_rep_event_param *param; 3051 3052 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3053 work->mad_recv_wc->recv_buf.mad; 3054 param = &work->cm_event.param.sidr_rep_rcvd; 3055 param->status = sidr_rep_msg->status; 3056 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3057 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3058 param->info = &sidr_rep_msg->info; 3059 param->info_len = sidr_rep_msg->info_length; 3060 work->cm_event.private_data = &sidr_rep_msg->private_data; 3061 } 3062 3063 static int cm_sidr_rep_handler(struct cm_work *work) 3064 { 3065 struct cm_sidr_rep_msg *sidr_rep_msg; 3066 struct cm_id_private *cm_id_priv; 3067 3068 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3069 work->mad_recv_wc->recv_buf.mad; 3070 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3071 if (!cm_id_priv) 3072 return -EINVAL; /* Unmatched reply. */ 3073 3074 spin_lock_irq(&cm_id_priv->lock); 3075 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3076 spin_unlock_irq(&cm_id_priv->lock); 3077 goto out; 3078 } 3079 cm_id_priv->id.state = IB_CM_IDLE; 3080 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3081 spin_unlock_irq(&cm_id_priv->lock); 3082 3083 cm_format_sidr_rep_event(work); 3084 cm_process_work(cm_id_priv, work); 3085 return 0; 3086 out: 3087 cm_deref_id(cm_id_priv); 3088 return -EINVAL; 3089 } 3090 3091 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3092 enum ib_wc_status wc_status) 3093 { 3094 struct cm_id_private *cm_id_priv; 3095 struct ib_cm_event cm_event; 3096 enum ib_cm_state state; 3097 int ret; 3098 3099 memset(&cm_event, 0, sizeof cm_event); 3100 cm_id_priv = msg->context[0]; 3101 3102 /* Discard old sends or ones without a response. */ 3103 spin_lock_irq(&cm_id_priv->lock); 3104 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3105 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3106 goto discard; 3107 3108 switch (state) { 3109 case IB_CM_REQ_SENT: 3110 case IB_CM_MRA_REQ_RCVD: 3111 cm_reset_to_idle(cm_id_priv); 3112 cm_event.event = IB_CM_REQ_ERROR; 3113 break; 3114 case IB_CM_REP_SENT: 3115 case IB_CM_MRA_REP_RCVD: 3116 cm_reset_to_idle(cm_id_priv); 3117 cm_event.event = IB_CM_REP_ERROR; 3118 break; 3119 case IB_CM_DREQ_SENT: 3120 cm_enter_timewait(cm_id_priv); 3121 cm_event.event = IB_CM_DREQ_ERROR; 3122 break; 3123 case IB_CM_SIDR_REQ_SENT: 3124 cm_id_priv->id.state = IB_CM_IDLE; 3125 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3126 break; 3127 default: 3128 goto discard; 3129 } 3130 spin_unlock_irq(&cm_id_priv->lock); 3131 cm_event.param.send_status = wc_status; 3132 3133 /* No other events can occur on the cm_id at this point. */ 3134 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3135 cm_free_msg(msg); 3136 if (ret) 3137 ib_destroy_cm_id(&cm_id_priv->id); 3138 return; 3139 discard: 3140 spin_unlock_irq(&cm_id_priv->lock); 3141 cm_free_msg(msg); 3142 } 3143 3144 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3145 struct ib_mad_send_wc *mad_send_wc) 3146 { 3147 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3148 struct cm_port *port; 3149 u16 attr_index; 3150 3151 port = mad_agent->context; 3152 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3153 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3154 3155 /* 3156 * If the send was in response to a received message (context[0] is not 3157 * set to a cm_id), and is not a REJ, then it is a send that was 3158 * manually retried. 3159 */ 3160 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3161 msg->retries = 1; 3162 3163 atomic_long_add(1 + msg->retries, 3164 &port->counter_group[CM_XMIT].counter[attr_index]); 3165 if (msg->retries) 3166 atomic_long_add(msg->retries, 3167 &port->counter_group[CM_XMIT_RETRIES]. 3168 counter[attr_index]); 3169 3170 switch (mad_send_wc->status) { 3171 case IB_WC_SUCCESS: 3172 case IB_WC_WR_FLUSH_ERR: 3173 cm_free_msg(msg); 3174 break; 3175 default: 3176 if (msg->context[0] && msg->context[1]) 3177 cm_process_send_error(msg, mad_send_wc->status); 3178 else 3179 cm_free_msg(msg); 3180 break; 3181 } 3182 } 3183 3184 static void cm_work_handler(struct work_struct *_work) 3185 { 3186 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3187 int ret; 3188 3189 switch (work->cm_event.event) { 3190 case IB_CM_REQ_RECEIVED: 3191 ret = cm_req_handler(work); 3192 break; 3193 case IB_CM_MRA_RECEIVED: 3194 ret = cm_mra_handler(work); 3195 break; 3196 case IB_CM_REJ_RECEIVED: 3197 ret = cm_rej_handler(work); 3198 break; 3199 case IB_CM_REP_RECEIVED: 3200 ret = cm_rep_handler(work); 3201 break; 3202 case IB_CM_RTU_RECEIVED: 3203 ret = cm_rtu_handler(work); 3204 break; 3205 case IB_CM_USER_ESTABLISHED: 3206 ret = cm_establish_handler(work); 3207 break; 3208 case IB_CM_DREQ_RECEIVED: 3209 ret = cm_dreq_handler(work); 3210 break; 3211 case IB_CM_DREP_RECEIVED: 3212 ret = cm_drep_handler(work); 3213 break; 3214 case IB_CM_SIDR_REQ_RECEIVED: 3215 ret = cm_sidr_req_handler(work); 3216 break; 3217 case IB_CM_SIDR_REP_RECEIVED: 3218 ret = cm_sidr_rep_handler(work); 3219 break; 3220 case IB_CM_LAP_RECEIVED: 3221 ret = cm_lap_handler(work); 3222 break; 3223 case IB_CM_APR_RECEIVED: 3224 ret = cm_apr_handler(work); 3225 break; 3226 case IB_CM_TIMEWAIT_EXIT: 3227 ret = cm_timewait_handler(work); 3228 break; 3229 default: 3230 ret = -EINVAL; 3231 break; 3232 } 3233 if (ret) 3234 cm_free_work(work); 3235 } 3236 3237 static int cm_establish(struct ib_cm_id *cm_id) 3238 { 3239 struct cm_id_private *cm_id_priv; 3240 struct cm_work *work; 3241 unsigned long flags; 3242 int ret = 0; 3243 3244 work = kmalloc(sizeof *work, GFP_ATOMIC); 3245 if (!work) 3246 return -ENOMEM; 3247 3248 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3249 spin_lock_irqsave(&cm_id_priv->lock, flags); 3250 switch (cm_id->state) 3251 { 3252 case IB_CM_REP_SENT: 3253 case IB_CM_MRA_REP_RCVD: 3254 cm_id->state = IB_CM_ESTABLISHED; 3255 break; 3256 case IB_CM_ESTABLISHED: 3257 ret = -EISCONN; 3258 break; 3259 default: 3260 ret = -EINVAL; 3261 break; 3262 } 3263 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3264 3265 if (ret) { 3266 kfree(work); 3267 goto out; 3268 } 3269 3270 /* 3271 * The CM worker thread may try to destroy the cm_id before it 3272 * can execute this work item. To prevent potential deadlock, 3273 * we need to find the cm_id once we're in the context of the 3274 * worker thread, rather than holding a reference on it. 3275 */ 3276 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3277 work->local_id = cm_id->local_id; 3278 work->remote_id = cm_id->remote_id; 3279 work->mad_recv_wc = NULL; 3280 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3281 queue_delayed_work(cm.wq, &work->work, 0); 3282 out: 3283 return ret; 3284 } 3285 3286 static int cm_migrate(struct ib_cm_id *cm_id) 3287 { 3288 struct cm_id_private *cm_id_priv; 3289 unsigned long flags; 3290 int ret = 0; 3291 3292 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3293 spin_lock_irqsave(&cm_id_priv->lock, flags); 3294 if (cm_id->state == IB_CM_ESTABLISHED && 3295 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3296 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3297 cm_id->lap_state = IB_CM_LAP_IDLE; 3298 cm_id_priv->av = cm_id_priv->alt_av; 3299 } else 3300 ret = -EINVAL; 3301 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3302 3303 return ret; 3304 } 3305 3306 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3307 { 3308 int ret; 3309 3310 switch (event) { 3311 case IB_EVENT_COMM_EST: 3312 ret = cm_establish(cm_id); 3313 break; 3314 case IB_EVENT_PATH_MIG: 3315 ret = cm_migrate(cm_id); 3316 break; 3317 default: 3318 ret = -EINVAL; 3319 } 3320 return ret; 3321 } 3322 EXPORT_SYMBOL(ib_cm_notify); 3323 3324 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3325 struct ib_mad_recv_wc *mad_recv_wc) 3326 { 3327 struct cm_port *port = mad_agent->context; 3328 struct cm_work *work; 3329 enum ib_cm_event_type event; 3330 u16 attr_id; 3331 int paths = 0; 3332 3333 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3334 case CM_REQ_ATTR_ID: 3335 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3336 alt_local_lid != 0); 3337 event = IB_CM_REQ_RECEIVED; 3338 break; 3339 case CM_MRA_ATTR_ID: 3340 event = IB_CM_MRA_RECEIVED; 3341 break; 3342 case CM_REJ_ATTR_ID: 3343 event = IB_CM_REJ_RECEIVED; 3344 break; 3345 case CM_REP_ATTR_ID: 3346 event = IB_CM_REP_RECEIVED; 3347 break; 3348 case CM_RTU_ATTR_ID: 3349 event = IB_CM_RTU_RECEIVED; 3350 break; 3351 case CM_DREQ_ATTR_ID: 3352 event = IB_CM_DREQ_RECEIVED; 3353 break; 3354 case CM_DREP_ATTR_ID: 3355 event = IB_CM_DREP_RECEIVED; 3356 break; 3357 case CM_SIDR_REQ_ATTR_ID: 3358 event = IB_CM_SIDR_REQ_RECEIVED; 3359 break; 3360 case CM_SIDR_REP_ATTR_ID: 3361 event = IB_CM_SIDR_REP_RECEIVED; 3362 break; 3363 case CM_LAP_ATTR_ID: 3364 paths = 1; 3365 event = IB_CM_LAP_RECEIVED; 3366 break; 3367 case CM_APR_ATTR_ID: 3368 event = IB_CM_APR_RECEIVED; 3369 break; 3370 default: 3371 ib_free_recv_mad(mad_recv_wc); 3372 return; 3373 } 3374 3375 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3376 atomic_long_inc(&port->counter_group[CM_RECV]. 3377 counter[attr_id - CM_ATTR_ID_OFFSET]); 3378 3379 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3380 GFP_KERNEL); 3381 if (!work) { 3382 ib_free_recv_mad(mad_recv_wc); 3383 return; 3384 } 3385 3386 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3387 work->cm_event.event = event; 3388 work->mad_recv_wc = mad_recv_wc; 3389 work->port = port; 3390 queue_delayed_work(cm.wq, &work->work, 0); 3391 } 3392 3393 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3394 struct ib_qp_attr *qp_attr, 3395 int *qp_attr_mask) 3396 { 3397 unsigned long flags; 3398 int ret; 3399 3400 spin_lock_irqsave(&cm_id_priv->lock, flags); 3401 switch (cm_id_priv->id.state) { 3402 case IB_CM_REQ_SENT: 3403 case IB_CM_MRA_REQ_RCVD: 3404 case IB_CM_REQ_RCVD: 3405 case IB_CM_MRA_REQ_SENT: 3406 case IB_CM_REP_RCVD: 3407 case IB_CM_MRA_REP_SENT: 3408 case IB_CM_REP_SENT: 3409 case IB_CM_MRA_REP_RCVD: 3410 case IB_CM_ESTABLISHED: 3411 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3412 IB_QP_PKEY_INDEX | IB_QP_PORT; 3413 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3414 if (cm_id_priv->responder_resources) 3415 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3416 IB_ACCESS_REMOTE_ATOMIC; 3417 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3418 qp_attr->port_num = cm_id_priv->av.port->port_num; 3419 ret = 0; 3420 break; 3421 default: 3422 ret = -EINVAL; 3423 break; 3424 } 3425 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3426 return ret; 3427 } 3428 3429 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3430 struct ib_qp_attr *qp_attr, 3431 int *qp_attr_mask) 3432 { 3433 unsigned long flags; 3434 int ret; 3435 3436 spin_lock_irqsave(&cm_id_priv->lock, flags); 3437 switch (cm_id_priv->id.state) { 3438 case IB_CM_REQ_RCVD: 3439 case IB_CM_MRA_REQ_SENT: 3440 case IB_CM_REP_RCVD: 3441 case IB_CM_MRA_REP_SENT: 3442 case IB_CM_REP_SENT: 3443 case IB_CM_MRA_REP_RCVD: 3444 case IB_CM_ESTABLISHED: 3445 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3446 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3447 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3448 qp_attr->path_mtu = cm_id_priv->path_mtu; 3449 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3450 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3451 if (cm_id_priv->qp_type == IB_QPT_RC) { 3452 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3453 IB_QP_MIN_RNR_TIMER; 3454 qp_attr->max_dest_rd_atomic = 3455 cm_id_priv->responder_resources; 3456 qp_attr->min_rnr_timer = 0; 3457 } 3458 if (cm_id_priv->alt_av.ah_attr.dlid) { 3459 *qp_attr_mask |= IB_QP_ALT_PATH; 3460 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3461 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3462 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3463 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3464 } 3465 ret = 0; 3466 break; 3467 default: 3468 ret = -EINVAL; 3469 break; 3470 } 3471 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3472 return ret; 3473 } 3474 3475 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3476 struct ib_qp_attr *qp_attr, 3477 int *qp_attr_mask) 3478 { 3479 unsigned long flags; 3480 int ret; 3481 3482 spin_lock_irqsave(&cm_id_priv->lock, flags); 3483 switch (cm_id_priv->id.state) { 3484 /* Allow transition to RTS before sending REP */ 3485 case IB_CM_REQ_RCVD: 3486 case IB_CM_MRA_REQ_SENT: 3487 3488 case IB_CM_REP_RCVD: 3489 case IB_CM_MRA_REP_SENT: 3490 case IB_CM_REP_SENT: 3491 case IB_CM_MRA_REP_RCVD: 3492 case IB_CM_ESTABLISHED: 3493 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3494 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3495 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3496 if (cm_id_priv->qp_type == IB_QPT_RC) { 3497 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3498 IB_QP_RNR_RETRY | 3499 IB_QP_MAX_QP_RD_ATOMIC; 3500 qp_attr->timeout = cm_id_priv->av.timeout; 3501 qp_attr->retry_cnt = cm_id_priv->retry_count; 3502 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3503 qp_attr->max_rd_atomic = 3504 cm_id_priv->initiator_depth; 3505 } 3506 if (cm_id_priv->alt_av.ah_attr.dlid) { 3507 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3508 qp_attr->path_mig_state = IB_MIG_REARM; 3509 } 3510 } else { 3511 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3512 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3513 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3514 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3515 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3516 qp_attr->path_mig_state = IB_MIG_REARM; 3517 } 3518 ret = 0; 3519 break; 3520 default: 3521 ret = -EINVAL; 3522 break; 3523 } 3524 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3525 return ret; 3526 } 3527 3528 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3529 struct ib_qp_attr *qp_attr, 3530 int *qp_attr_mask) 3531 { 3532 struct cm_id_private *cm_id_priv; 3533 int ret; 3534 3535 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3536 switch (qp_attr->qp_state) { 3537 case IB_QPS_INIT: 3538 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3539 break; 3540 case IB_QPS_RTR: 3541 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3542 break; 3543 case IB_QPS_RTS: 3544 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3545 break; 3546 default: 3547 ret = -EINVAL; 3548 break; 3549 } 3550 return ret; 3551 } 3552 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3553 3554 static void cm_get_ack_delay(struct cm_device *cm_dev) 3555 { 3556 struct ib_device_attr attr; 3557 3558 if (ib_query_device(cm_dev->device, &attr)) 3559 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3560 else 3561 cm_dev->ack_delay = attr.local_ca_ack_delay; 3562 } 3563 3564 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3565 char *buf) 3566 { 3567 struct cm_counter_group *group; 3568 struct cm_counter_attribute *cm_attr; 3569 3570 group = container_of(obj, struct cm_counter_group, obj); 3571 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3572 3573 return sprintf(buf, "%ld\n", 3574 atomic_long_read(&group->counter[cm_attr->index])); 3575 } 3576 3577 static struct sysfs_ops cm_counter_ops = { 3578 .show = cm_show_counter 3579 }; 3580 3581 static struct kobj_type cm_counter_obj_type = { 3582 .sysfs_ops = &cm_counter_ops, 3583 .default_attrs = cm_counter_default_attrs 3584 }; 3585 3586 static void cm_release_port_obj(struct kobject *obj) 3587 { 3588 struct cm_port *cm_port; 3589 3590 printk(KERN_ERR "free cm port\n"); 3591 3592 cm_port = container_of(obj, struct cm_port, port_obj); 3593 kfree(cm_port); 3594 } 3595 3596 static struct kobj_type cm_port_obj_type = { 3597 .release = cm_release_port_obj 3598 }; 3599 3600 static void cm_release_dev_obj(struct kobject *obj) 3601 { 3602 struct cm_device *cm_dev; 3603 3604 printk(KERN_ERR "free cm dev\n"); 3605 3606 cm_dev = container_of(obj, struct cm_device, dev_obj); 3607 kfree(cm_dev); 3608 } 3609 3610 static struct kobj_type cm_dev_obj_type = { 3611 .release = cm_release_dev_obj 3612 }; 3613 3614 struct class cm_class = { 3615 .name = "infiniband_cm", 3616 }; 3617 EXPORT_SYMBOL(cm_class); 3618 3619 static void cm_remove_fs_obj(struct kobject *obj) 3620 { 3621 kobject_put(obj->parent); 3622 kobject_put(obj); 3623 } 3624 3625 static int cm_create_port_fs(struct cm_port *port) 3626 { 3627 int i, ret; 3628 3629 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3630 kobject_get(&port->cm_dev->dev_obj), 3631 "%d", port->port_num); 3632 if (ret) { 3633 kfree(port); 3634 return ret; 3635 } 3636 3637 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3638 ret = kobject_init_and_add(&port->counter_group[i].obj, 3639 &cm_counter_obj_type, 3640 kobject_get(&port->port_obj), 3641 "%s", counter_group_names[i]); 3642 if (ret) 3643 goto error; 3644 } 3645 3646 return 0; 3647 3648 error: 3649 while (i--) 3650 cm_remove_fs_obj(&port->counter_group[i].obj); 3651 cm_remove_fs_obj(&port->port_obj); 3652 return ret; 3653 3654 } 3655 3656 static void cm_remove_port_fs(struct cm_port *port) 3657 { 3658 int i; 3659 3660 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3661 cm_remove_fs_obj(&port->counter_group[i].obj); 3662 3663 cm_remove_fs_obj(&port->port_obj); 3664 } 3665 3666 static void cm_add_one(struct ib_device *device) 3667 { 3668 struct cm_device *cm_dev; 3669 struct cm_port *port; 3670 struct ib_mad_reg_req reg_req = { 3671 .mgmt_class = IB_MGMT_CLASS_CM, 3672 .mgmt_class_version = IB_CM_CLASS_VERSION 3673 }; 3674 struct ib_port_modify port_modify = { 3675 .set_port_cap_mask = IB_PORT_CM_SUP 3676 }; 3677 unsigned long flags; 3678 int ret; 3679 u8 i; 3680 3681 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3682 return; 3683 3684 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3685 device->phys_port_cnt, GFP_KERNEL); 3686 if (!cm_dev) 3687 return; 3688 3689 cm_dev->device = device; 3690 cm_get_ack_delay(cm_dev); 3691 3692 ret = kobject_init_and_add(&cm_dev->dev_obj, &cm_dev_obj_type, 3693 &cm_class.subsys.kobj, "%s", device->name); 3694 if (ret) { 3695 kfree(cm_dev); 3696 return; 3697 } 3698 3699 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3700 for (i = 1; i <= device->phys_port_cnt; i++) { 3701 port = kzalloc(sizeof *port, GFP_KERNEL); 3702 if (!port) 3703 goto error1; 3704 3705 cm_dev->port[i-1] = port; 3706 port->cm_dev = cm_dev; 3707 port->port_num = i; 3708 3709 ret = cm_create_port_fs(port); 3710 if (ret) 3711 goto error1; 3712 3713 port->mad_agent = ib_register_mad_agent(device, i, 3714 IB_QPT_GSI, 3715 ®_req, 3716 0, 3717 cm_send_handler, 3718 cm_recv_handler, 3719 port); 3720 if (IS_ERR(port->mad_agent)) 3721 goto error2; 3722 3723 ret = ib_modify_port(device, i, 0, &port_modify); 3724 if (ret) 3725 goto error3; 3726 } 3727 ib_set_client_data(device, &cm_client, cm_dev); 3728 3729 write_lock_irqsave(&cm.device_lock, flags); 3730 list_add_tail(&cm_dev->list, &cm.device_list); 3731 write_unlock_irqrestore(&cm.device_lock, flags); 3732 return; 3733 3734 error3: 3735 ib_unregister_mad_agent(port->mad_agent); 3736 error2: 3737 cm_remove_port_fs(port); 3738 error1: 3739 port_modify.set_port_cap_mask = 0; 3740 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3741 while (--i) { 3742 port = cm_dev->port[i-1]; 3743 ib_modify_port(device, port->port_num, 0, &port_modify); 3744 ib_unregister_mad_agent(port->mad_agent); 3745 cm_remove_port_fs(port); 3746 } 3747 cm_remove_fs_obj(&cm_dev->dev_obj); 3748 } 3749 3750 static void cm_remove_one(struct ib_device *device) 3751 { 3752 struct cm_device *cm_dev; 3753 struct cm_port *port; 3754 struct ib_port_modify port_modify = { 3755 .clr_port_cap_mask = IB_PORT_CM_SUP 3756 }; 3757 unsigned long flags; 3758 int i; 3759 3760 cm_dev = ib_get_client_data(device, &cm_client); 3761 if (!cm_dev) 3762 return; 3763 3764 write_lock_irqsave(&cm.device_lock, flags); 3765 list_del(&cm_dev->list); 3766 write_unlock_irqrestore(&cm.device_lock, flags); 3767 3768 for (i = 1; i <= device->phys_port_cnt; i++) { 3769 port = cm_dev->port[i-1]; 3770 ib_modify_port(device, port->port_num, 0, &port_modify); 3771 ib_unregister_mad_agent(port->mad_agent); 3772 cm_remove_port_fs(port); 3773 } 3774 cm_remove_fs_obj(&cm_dev->dev_obj); 3775 } 3776 3777 static int __init ib_cm_init(void) 3778 { 3779 int ret; 3780 3781 memset(&cm, 0, sizeof cm); 3782 INIT_LIST_HEAD(&cm.device_list); 3783 rwlock_init(&cm.device_lock); 3784 spin_lock_init(&cm.lock); 3785 cm.listen_service_table = RB_ROOT; 3786 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3787 cm.remote_id_table = RB_ROOT; 3788 cm.remote_qp_table = RB_ROOT; 3789 cm.remote_sidr_table = RB_ROOT; 3790 idr_init(&cm.local_id_table); 3791 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3792 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3793 INIT_LIST_HEAD(&cm.timewait_list); 3794 3795 ret = class_register(&cm_class); 3796 if (ret) 3797 return -ENOMEM; 3798 3799 cm.wq = create_workqueue("ib_cm"); 3800 if (!cm.wq) { 3801 ret = -ENOMEM; 3802 goto error1; 3803 } 3804 3805 ret = ib_register_client(&cm_client); 3806 if (ret) 3807 goto error2; 3808 3809 return 0; 3810 error2: 3811 destroy_workqueue(cm.wq); 3812 error1: 3813 class_unregister(&cm_class); 3814 return ret; 3815 } 3816 3817 static void __exit ib_cm_cleanup(void) 3818 { 3819 struct cm_timewait_info *timewait_info, *tmp; 3820 3821 spin_lock_irq(&cm.lock); 3822 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3823 cancel_delayed_work(&timewait_info->work.work); 3824 spin_unlock_irq(&cm.lock); 3825 3826 destroy_workqueue(cm.wq); 3827 3828 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3829 list_del(&timewait_info->list); 3830 kfree(timewait_info); 3831 } 3832 3833 ib_unregister_client(&cm_client); 3834 class_unregister(&cm_class); 3835 idr_destroy(&cm.local_id_table); 3836 } 3837 3838 module_init(ib_cm_init); 3839 module_exit(ib_cm_cleanup); 3840 3841