1/* 2 * Copyright (c) 2005 Intel Inc. All rights reserved. 3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34#include "mad_priv.h" 35#include "mad_rmpp.h" 36 37enum rmpp_state { 38 RMPP_STATE_ACTIVE, 39 RMPP_STATE_TIMEOUT, 40 RMPP_STATE_COMPLETE, 41 RMPP_STATE_CANCELING 42}; 43 44struct mad_rmpp_recv { 45 struct ib_mad_agent_private *agent; 46 struct list_head list; 47 struct delayed_work timeout_work; 48 struct delayed_work cleanup_work; 49 struct completion comp; 50 enum rmpp_state state; 51 spinlock_t lock; 52 atomic_t refcount; 53 54 struct ib_ah *ah; 55 struct ib_mad_recv_wc *rmpp_wc; 56 struct ib_mad_recv_buf *cur_seg_buf; 57 int last_ack; 58 int seg_num; 59 int newwin; 60 int repwin; 61 62 __be64 tid; 63 u32 src_qp; 64 u16 slid; 65 u8 mgmt_class; 66 u8 class_version; 67 u8 method; 68}; 69 70static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 71{ 72 if (atomic_dec_and_test(&rmpp_recv->refcount)) 73 complete(&rmpp_recv->comp); 74} 75 76static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 77{ 78 deref_rmpp_recv(rmpp_recv); 79 wait_for_completion(&rmpp_recv->comp); 80 ib_destroy_ah(rmpp_recv->ah); 81 kfree(rmpp_recv); 82} 83 84void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) 85{ 86 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; 87 unsigned long flags; 88 89 spin_lock_irqsave(&agent->lock, flags); 90 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 91 if (rmpp_recv->state != RMPP_STATE_COMPLETE) 92 ib_free_recv_mad(rmpp_recv->rmpp_wc); 93 rmpp_recv->state = RMPP_STATE_CANCELING; 94 } 95 spin_unlock_irqrestore(&agent->lock, flags); 96 97 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 98 cancel_delayed_work(&rmpp_recv->timeout_work); 99 cancel_delayed_work(&rmpp_recv->cleanup_work); 100 } 101 102 flush_workqueue(agent->qp_info->port_priv->wq); 103 104 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, 105 &agent->rmpp_list, list) { 106 list_del(&rmpp_recv->list); 107 destroy_rmpp_recv(rmpp_recv); 108 } 109} 110 111static void format_ack(struct ib_mad_send_buf *msg, 112 struct ib_rmpp_mad *data, 113 struct mad_rmpp_recv *rmpp_recv) 114{ 115 struct ib_rmpp_mad *ack = msg->mad; 116 unsigned long flags; 117 118 memcpy(ack, &data->mad_hdr, msg->hdr_len); 119 120 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 121 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; 122 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 123 124 spin_lock_irqsave(&rmpp_recv->lock, flags); 125 rmpp_recv->last_ack = rmpp_recv->seg_num; 126 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); 127 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); 128 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 129} 130 131static void ack_recv(struct mad_rmpp_recv *rmpp_recv, 132 struct ib_mad_recv_wc *recv_wc) 133{ 134 struct ib_mad_send_buf *msg; 135 int ret, hdr_len; 136 137 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 138 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, 139 recv_wc->wc->pkey_index, 1, hdr_len, 140 0, GFP_KERNEL); 141 if (IS_ERR(msg)) 142 return; 143 144 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); 145 msg->ah = rmpp_recv->ah; 146 ret = ib_post_send_mad(msg, NULL); 147 if (ret) 148 ib_free_send_mad(msg); 149} 150 151static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent, 152 struct ib_mad_recv_wc *recv_wc) 153{ 154 struct ib_mad_send_buf *msg; 155 struct ib_ah *ah; 156 int hdr_len; 157 158 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, 159 recv_wc->recv_buf.grh, agent->port_num); 160 if (IS_ERR(ah)) 161 return (void *) ah; 162 163 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 164 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp, 165 recv_wc->wc->pkey_index, 1, 166 hdr_len, 0, GFP_KERNEL); 167 if (IS_ERR(msg)) 168 ib_destroy_ah(ah); 169 else { 170 msg->ah = ah; 171 msg->context[0] = ah; 172 } 173 174 return msg; 175} 176 177static void ack_ds_ack(struct ib_mad_agent_private *agent, 178 struct ib_mad_recv_wc *recv_wc) 179{ 180 struct ib_mad_send_buf *msg; 181 struct ib_rmpp_mad *rmpp_mad; 182 int ret; 183 184 msg = alloc_response_msg(&agent->agent, recv_wc); 185 if (IS_ERR(msg)) 186 return; 187 188 rmpp_mad = msg->mad; 189 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 190 191 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 192 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 193 rmpp_mad->rmpp_hdr.seg_num = 0; 194 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1); 195 196 ret = ib_post_send_mad(msg, NULL); 197 if (ret) { 198 ib_destroy_ah(msg->ah); 199 ib_free_send_mad(msg); 200 } 201} 202 203void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc) 204{ 205 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah) 206 ib_destroy_ah(mad_send_wc->send_buf->ah); 207 ib_free_send_mad(mad_send_wc->send_buf); 208} 209 210static void nack_recv(struct ib_mad_agent_private *agent, 211 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) 212{ 213 struct ib_mad_send_buf *msg; 214 struct ib_rmpp_mad *rmpp_mad; 215 int ret; 216 217 msg = alloc_response_msg(&agent->agent, recv_wc); 218 if (IS_ERR(msg)) 219 return; 220 221 rmpp_mad = msg->mad; 222 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 223 224 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 225 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; 226 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; 227 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 228 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; 229 rmpp_mad->rmpp_hdr.seg_num = 0; 230 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 231 232 ret = ib_post_send_mad(msg, NULL); 233 if (ret) { 234 ib_destroy_ah(msg->ah); 235 ib_free_send_mad(msg); 236 } 237} 238 239static void recv_timeout_handler(struct work_struct *work) 240{ 241 struct mad_rmpp_recv *rmpp_recv = 242 container_of(work, struct mad_rmpp_recv, timeout_work.work); 243 struct ib_mad_recv_wc *rmpp_wc; 244 unsigned long flags; 245 246 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 247 if (rmpp_recv->state != RMPP_STATE_ACTIVE) { 248 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 249 return; 250 } 251 rmpp_recv->state = RMPP_STATE_TIMEOUT; 252 list_del(&rmpp_recv->list); 253 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 254 255 rmpp_wc = rmpp_recv->rmpp_wc; 256 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); 257 destroy_rmpp_recv(rmpp_recv); 258 ib_free_recv_mad(rmpp_wc); 259} 260 261static void recv_cleanup_handler(struct work_struct *work) 262{ 263 struct mad_rmpp_recv *rmpp_recv = 264 container_of(work, struct mad_rmpp_recv, cleanup_work.work); 265 unsigned long flags; 266 267 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 268 if (rmpp_recv->state == RMPP_STATE_CANCELING) { 269 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 270 return; 271 } 272 list_del(&rmpp_recv->list); 273 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 274 destroy_rmpp_recv(rmpp_recv); 275} 276 277static struct mad_rmpp_recv * 278create_rmpp_recv(struct ib_mad_agent_private *agent, 279 struct ib_mad_recv_wc *mad_recv_wc) 280{ 281 struct mad_rmpp_recv *rmpp_recv; 282 struct ib_mad_hdr *mad_hdr; 283 284 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); 285 if (!rmpp_recv) 286 return NULL; 287 288 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, 289 mad_recv_wc->wc, 290 mad_recv_wc->recv_buf.grh, 291 agent->agent.port_num); 292 if (IS_ERR(rmpp_recv->ah)) 293 goto error; 294 295 rmpp_recv->agent = agent; 296 init_completion(&rmpp_recv->comp); 297 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler); 298 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler); 299 spin_lock_init(&rmpp_recv->lock); 300 rmpp_recv->state = RMPP_STATE_ACTIVE; 301 atomic_set(&rmpp_recv->refcount, 1); 302 303 rmpp_recv->rmpp_wc = mad_recv_wc; 304 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; 305 rmpp_recv->newwin = 1; 306 rmpp_recv->seg_num = 1; 307 rmpp_recv->last_ack = 0; 308 rmpp_recv->repwin = 1; 309 310 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 311 rmpp_recv->tid = mad_hdr->tid; 312 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; 313 rmpp_recv->slid = mad_recv_wc->wc->slid; 314 rmpp_recv->mgmt_class = mad_hdr->mgmt_class; 315 rmpp_recv->class_version = mad_hdr->class_version; 316 rmpp_recv->method = mad_hdr->method; 317 return rmpp_recv; 318 319error: kfree(rmpp_recv); 320 return NULL; 321} 322 323static struct mad_rmpp_recv * 324find_rmpp_recv(struct ib_mad_agent_private *agent, 325 struct ib_mad_recv_wc *mad_recv_wc) 326{ 327 struct mad_rmpp_recv *rmpp_recv; 328 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 329 330 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 331 if (rmpp_recv->tid == mad_hdr->tid && 332 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && 333 rmpp_recv->slid == mad_recv_wc->wc->slid && 334 rmpp_recv->mgmt_class == mad_hdr->mgmt_class && 335 rmpp_recv->class_version == mad_hdr->class_version && 336 rmpp_recv->method == mad_hdr->method) 337 return rmpp_recv; 338 } 339 return NULL; 340} 341 342static struct mad_rmpp_recv * 343acquire_rmpp_recv(struct ib_mad_agent_private *agent, 344 struct ib_mad_recv_wc *mad_recv_wc) 345{ 346 struct mad_rmpp_recv *rmpp_recv; 347 unsigned long flags; 348 349 spin_lock_irqsave(&agent->lock, flags); 350 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 351 if (rmpp_recv) 352 atomic_inc(&rmpp_recv->refcount); 353 spin_unlock_irqrestore(&agent->lock, flags); 354 return rmpp_recv; 355} 356 357static struct mad_rmpp_recv * 358insert_rmpp_recv(struct ib_mad_agent_private *agent, 359 struct mad_rmpp_recv *rmpp_recv) 360{ 361 struct mad_rmpp_recv *cur_rmpp_recv; 362 363 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); 364 if (!cur_rmpp_recv) 365 list_add_tail(&rmpp_recv->list, &agent->rmpp_list); 366 367 return cur_rmpp_recv; 368} 369 370static inline int get_last_flag(struct ib_mad_recv_buf *seg) 371{ 372 struct ib_rmpp_mad *rmpp_mad; 373 374 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 375 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; 376} 377 378static inline int get_seg_num(struct ib_mad_recv_buf *seg) 379{ 380 struct ib_rmpp_mad *rmpp_mad; 381 382 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 383 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 384} 385 386static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, 387 struct ib_mad_recv_buf *seg) 388{ 389 if (seg->list.next == rmpp_list) 390 return NULL; 391 392 return container_of(seg->list.next, struct ib_mad_recv_buf, list); 393} 394 395static inline int window_size(struct ib_mad_agent_private *agent) 396{ 397 return max(agent->qp_info->recv_queue.max_active >> 3, 1); 398} 399 400static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, 401 int seg_num) 402{ 403 struct ib_mad_recv_buf *seg_buf; 404 int cur_seg_num; 405 406 list_for_each_entry_reverse(seg_buf, rmpp_list, list) { 407 cur_seg_num = get_seg_num(seg_buf); 408 if (seg_num > cur_seg_num) 409 return seg_buf; 410 if (seg_num == cur_seg_num) 411 break; 412 } 413 return NULL; 414} 415 416static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, 417 struct ib_mad_recv_buf *new_buf) 418{ 419 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; 420 421 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { 422 rmpp_recv->cur_seg_buf = new_buf; 423 rmpp_recv->seg_num++; 424 new_buf = get_next_seg(rmpp_list, new_buf); 425 } 426} 427 428static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) 429{ 430 struct ib_rmpp_mad *rmpp_mad; 431 int hdr_size, data_size, pad; 432 433 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; 434 435 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 436 data_size = sizeof(struct ib_rmpp_mad) - hdr_size; 437 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 438 if (pad > IB_MGMT_RMPP_DATA || pad < 0) 439 pad = 0; 440 441 return hdr_size + rmpp_recv->seg_num * data_size - pad; 442} 443 444static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) 445{ 446 struct ib_mad_recv_wc *rmpp_wc; 447 448 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); 449 if (rmpp_recv->seg_num > 1) 450 cancel_delayed_work(&rmpp_recv->timeout_work); 451 452 rmpp_wc = rmpp_recv->rmpp_wc; 453 rmpp_wc->mad_len = get_mad_len(rmpp_recv); 454 /* 10 seconds until we can find the packet lifetime */ 455 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, 456 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); 457 return rmpp_wc; 458} 459 460static struct ib_mad_recv_wc * 461continue_rmpp(struct ib_mad_agent_private *agent, 462 struct ib_mad_recv_wc *mad_recv_wc) 463{ 464 struct mad_rmpp_recv *rmpp_recv; 465 struct ib_mad_recv_buf *prev_buf; 466 struct ib_mad_recv_wc *done_wc; 467 int seg_num; 468 unsigned long flags; 469 470 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); 471 if (!rmpp_recv) 472 goto drop1; 473 474 seg_num = get_seg_num(&mad_recv_wc->recv_buf); 475 476 spin_lock_irqsave(&rmpp_recv->lock, flags); 477 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || 478 (seg_num > rmpp_recv->newwin)) 479 goto drop3; 480 481 if ((seg_num <= rmpp_recv->last_ack) || 482 (rmpp_recv->state == RMPP_STATE_COMPLETE)) { 483 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 484 ack_recv(rmpp_recv, mad_recv_wc); 485 goto drop2; 486 } 487 488 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); 489 if (!prev_buf) 490 goto drop3; 491 492 done_wc = NULL; 493 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); 494 if (rmpp_recv->cur_seg_buf == prev_buf) { 495 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); 496 if (get_last_flag(rmpp_recv->cur_seg_buf)) { 497 rmpp_recv->state = RMPP_STATE_COMPLETE; 498 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 499 done_wc = complete_rmpp(rmpp_recv); 500 goto out; 501 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { 502 rmpp_recv->newwin += window_size(agent); 503 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 504 ack_recv(rmpp_recv, mad_recv_wc); 505 goto out; 506 } 507 } 508 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 509out: 510 deref_rmpp_recv(rmpp_recv); 511 return done_wc; 512 513drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); 514drop2: deref_rmpp_recv(rmpp_recv); 515drop1: ib_free_recv_mad(mad_recv_wc); 516 return NULL; 517} 518 519static struct ib_mad_recv_wc * 520start_rmpp(struct ib_mad_agent_private *agent, 521 struct ib_mad_recv_wc *mad_recv_wc) 522{ 523 struct mad_rmpp_recv *rmpp_recv; 524 unsigned long flags; 525 526 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); 527 if (!rmpp_recv) { 528 ib_free_recv_mad(mad_recv_wc); 529 return NULL; 530 } 531 532 spin_lock_irqsave(&agent->lock, flags); 533 if (insert_rmpp_recv(agent, rmpp_recv)) { 534 spin_unlock_irqrestore(&agent->lock, flags); 535 /* duplicate first MAD */ 536 destroy_rmpp_recv(rmpp_recv); 537 return continue_rmpp(agent, mad_recv_wc); 538 } 539 atomic_inc(&rmpp_recv->refcount); 540 541 if (get_last_flag(&mad_recv_wc->recv_buf)) { 542 rmpp_recv->state = RMPP_STATE_COMPLETE; 543 spin_unlock_irqrestore(&agent->lock, flags); 544 complete_rmpp(rmpp_recv); 545 } else { 546 spin_unlock_irqrestore(&agent->lock, flags); 547 /* 40 seconds until we can find the packet lifetimes */ 548 queue_delayed_work(agent->qp_info->port_priv->wq, 549 &rmpp_recv->timeout_work, 550 msecs_to_jiffies(40000)); 551 rmpp_recv->newwin += window_size(agent); 552 ack_recv(rmpp_recv, mad_recv_wc); 553 mad_recv_wc = NULL; 554 } 555 deref_rmpp_recv(rmpp_recv); 556 return mad_recv_wc; 557} 558 559static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) 560{ 561 struct ib_rmpp_mad *rmpp_mad; 562 int timeout; 563 u32 paylen = 0; 564 565 rmpp_mad = mad_send_wr->send_buf.mad; 566 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 567 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num); 568 569 if (mad_send_wr->seg_num == 1) { 570 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; 571 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA - 572 mad_send_wr->pad; 573 } 574 575 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) { 576 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; 577 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad; 578 } 579 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 580 581 /* 2 seconds for an ACK until we can find the packet lifetime */ 582 timeout = mad_send_wr->send_buf.timeout_ms; 583 if (!timeout || timeout > 2000) 584 mad_send_wr->timeout = msecs_to_jiffies(2000); 585 586 return ib_send_mad(mad_send_wr); 587} 588 589static void abort_send(struct ib_mad_agent_private *agent, 590 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status) 591{ 592 struct ib_mad_send_wr_private *mad_send_wr; 593 struct ib_mad_send_wc wc; 594 unsigned long flags; 595 596 spin_lock_irqsave(&agent->lock, flags); 597 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 598 if (!mad_send_wr) 599 goto out; /* Unmatched send */ 600 601 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 602 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 603 goto out; /* Send is already done */ 604 605 ib_mark_mad_done(mad_send_wr); 606 spin_unlock_irqrestore(&agent->lock, flags); 607 608 wc.status = IB_WC_REM_ABORT_ERR; 609 wc.vendor_err = rmpp_status; 610 wc.send_buf = &mad_send_wr->send_buf; 611 ib_mad_complete_send_wr(mad_send_wr, &wc); 612 return; 613out: 614 spin_unlock_irqrestore(&agent->lock, flags); 615} 616 617static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr, 618 int seg_num) 619{ 620 struct list_head *list; 621 622 wr->last_ack = seg_num; 623 list = &wr->last_ack_seg->list; 624 list_for_each_entry(wr->last_ack_seg, list, list) 625 if (wr->last_ack_seg->num == seg_num) 626 break; 627} 628 629static void process_ds_ack(struct ib_mad_agent_private *agent, 630 struct ib_mad_recv_wc *mad_recv_wc, int newwin) 631{ 632 struct mad_rmpp_recv *rmpp_recv; 633 634 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 635 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE) 636 rmpp_recv->repwin = newwin; 637} 638 639static void process_rmpp_ack(struct ib_mad_agent_private *agent, 640 struct ib_mad_recv_wc *mad_recv_wc) 641{ 642 struct ib_mad_send_wr_private *mad_send_wr; 643 struct ib_rmpp_mad *rmpp_mad; 644 unsigned long flags; 645 int seg_num, newwin, ret; 646 647 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 648 if (rmpp_mad->rmpp_hdr.rmpp_status) { 649 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 650 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 651 return; 652 } 653 654 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 655 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 656 if (newwin < seg_num) { 657 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 658 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 659 return; 660 } 661 662 spin_lock_irqsave(&agent->lock, flags); 663 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 664 if (!mad_send_wr) { 665 if (!seg_num) 666 process_ds_ack(agent, mad_recv_wc, newwin); 667 goto out; /* Unmatched or DS RMPP ACK */ 668 } 669 670 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) && 671 (mad_send_wr->timeout)) { 672 spin_unlock_irqrestore(&agent->lock, flags); 673 ack_ds_ack(agent, mad_recv_wc); 674 return; /* Repeated ACK for DS RMPP transaction */ 675 } 676 677 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 678 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 679 goto out; /* Send is already done */ 680 681 if (seg_num > mad_send_wr->send_buf.seg_count || 682 seg_num > mad_send_wr->newwin) { 683 spin_unlock_irqrestore(&agent->lock, flags); 684 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 685 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 686 return; 687 } 688 689 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) 690 goto out; /* Old ACK */ 691 692 if (seg_num > mad_send_wr->last_ack) { 693 adjust_last_ack(mad_send_wr, seg_num); 694 mad_send_wr->retries_left = mad_send_wr->max_retries; 695 } 696 mad_send_wr->newwin = newwin; 697 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 698 /* If no response is expected, the ACK completes the send */ 699 if (!mad_send_wr->send_buf.timeout_ms) { 700 struct ib_mad_send_wc wc; 701 702 ib_mark_mad_done(mad_send_wr); 703 spin_unlock_irqrestore(&agent->lock, flags); 704 705 wc.status = IB_WC_SUCCESS; 706 wc.vendor_err = 0; 707 wc.send_buf = &mad_send_wr->send_buf; 708 ib_mad_complete_send_wr(mad_send_wr, &wc); 709 return; 710 } 711 if (mad_send_wr->refcount == 1) 712 ib_reset_mad_timeout(mad_send_wr, 713 mad_send_wr->send_buf.timeout_ms); 714 spin_unlock_irqrestore(&agent->lock, flags); 715 ack_ds_ack(agent, mad_recv_wc); 716 return; 717 } else if (mad_send_wr->refcount == 1 && 718 mad_send_wr->seg_num < mad_send_wr->newwin && 719 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) { 720 /* Send failure will just result in a timeout/retry */ 721 ret = send_next_seg(mad_send_wr); 722 if (ret) 723 goto out; 724 725 mad_send_wr->refcount++; 726 list_move_tail(&mad_send_wr->agent_list, 727 &mad_send_wr->mad_agent_priv->send_list); 728 } 729out: 730 spin_unlock_irqrestore(&agent->lock, flags); 731} 732 733static struct ib_mad_recv_wc * 734process_rmpp_data(struct ib_mad_agent_private *agent, 735 struct ib_mad_recv_wc *mad_recv_wc) 736{ 737 struct ib_rmpp_hdr *rmpp_hdr; 738 u8 rmpp_status; 739 740 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; 741 742 if (rmpp_hdr->rmpp_status) { 743 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; 744 goto bad; 745 } 746 747 if (rmpp_hdr->seg_num == cpu_to_be32(1)) { 748 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { 749 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 750 goto bad; 751 } 752 return start_rmpp(agent, mad_recv_wc); 753 } else { 754 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { 755 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 756 goto bad; 757 } 758 return continue_rmpp(agent, mad_recv_wc); 759 } 760bad: 761 nack_recv(agent, mad_recv_wc, rmpp_status); 762 ib_free_recv_mad(mad_recv_wc); 763 return NULL; 764} 765 766static void process_rmpp_stop(struct ib_mad_agent_private *agent, 767 struct ib_mad_recv_wc *mad_recv_wc) 768{ 769 struct ib_rmpp_mad *rmpp_mad; 770 771 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 772 773 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { 774 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 775 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 776 } else 777 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 778} 779 780static void process_rmpp_abort(struct ib_mad_agent_private *agent, 781 struct ib_mad_recv_wc *mad_recv_wc) 782{ 783 struct ib_rmpp_mad *rmpp_mad; 784 785 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 786 787 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || 788 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { 789 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 790 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 791 } else 792 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 793} 794 795struct ib_mad_recv_wc * 796ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, 797 struct ib_mad_recv_wc *mad_recv_wc) 798{ 799 struct ib_rmpp_mad *rmpp_mad; 800 801 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 802 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) 803 return mad_recv_wc; 804 805 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { 806 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 807 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 808 goto out; 809 } 810 811 switch (rmpp_mad->rmpp_hdr.rmpp_type) { 812 case IB_MGMT_RMPP_TYPE_DATA: 813 return process_rmpp_data(agent, mad_recv_wc); 814 case IB_MGMT_RMPP_TYPE_ACK: 815 process_rmpp_ack(agent, mad_recv_wc); 816 break; 817 case IB_MGMT_RMPP_TYPE_STOP: 818 process_rmpp_stop(agent, mad_recv_wc); 819 break; 820 case IB_MGMT_RMPP_TYPE_ABORT: 821 process_rmpp_abort(agent, mad_recv_wc); 822 break; 823 default: 824 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 825 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 826 break; 827 } 828out: 829 ib_free_recv_mad(mad_recv_wc); 830 return NULL; 831} 832 833static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr) 834{ 835 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv; 836 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad; 837 struct mad_rmpp_recv *rmpp_recv; 838 struct ib_ah_attr ah_attr; 839 unsigned long flags; 840 int newwin = 1; 841 842 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP)) 843 goto out; 844 845 spin_lock_irqsave(&agent->lock, flags); 846 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 847 if (rmpp_recv->tid != mad_hdr->tid || 848 rmpp_recv->mgmt_class != mad_hdr->mgmt_class || 849 rmpp_recv->class_version != mad_hdr->class_version || 850 (rmpp_recv->method & IB_MGMT_METHOD_RESP)) 851 continue; 852 853 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr)) 854 continue; 855 856 if (rmpp_recv->slid == ah_attr.dlid) { 857 newwin = rmpp_recv->repwin; 858 break; 859 } 860 } 861 spin_unlock_irqrestore(&agent->lock, flags); 862out: 863 return newwin; 864} 865 866int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) 867{ 868 struct ib_rmpp_mad *rmpp_mad; 869 int ret; 870 871 rmpp_mad = mad_send_wr->send_buf.mad; 872 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 873 IB_MGMT_RMPP_FLAG_ACTIVE)) 874 return IB_RMPP_RESULT_UNHANDLED; 875 876 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { 877 mad_send_wr->seg_num = 1; 878 return IB_RMPP_RESULT_INTERNAL; 879 } 880 881 mad_send_wr->newwin = init_newwin(mad_send_wr); 882 883 /* We need to wait for the final ACK even if there isn't a response */ 884 mad_send_wr->refcount += (mad_send_wr->timeout == 0); 885 ret = send_next_seg(mad_send_wr); 886 if (!ret) 887 return IB_RMPP_RESULT_CONSUMED; 888 return ret; 889} 890 891int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, 892 struct ib_mad_send_wc *mad_send_wc) 893{ 894 struct ib_rmpp_mad *rmpp_mad; 895 int ret; 896 897 rmpp_mad = mad_send_wr->send_buf.mad; 898 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 899 IB_MGMT_RMPP_FLAG_ACTIVE)) 900 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 901 902 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) 903 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ 904 905 if (mad_send_wc->status != IB_WC_SUCCESS || 906 mad_send_wr->status != IB_WC_SUCCESS) 907 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ 908 909 if (!mad_send_wr->timeout) 910 return IB_RMPP_RESULT_PROCESSED; /* Response received */ 911 912 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 913 mad_send_wr->timeout = 914 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 915 return IB_RMPP_RESULT_PROCESSED; /* Send done */ 916 } 917 918 if (mad_send_wr->seg_num == mad_send_wr->newwin || 919 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) 920 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ 921 922 ret = send_next_seg(mad_send_wr); 923 if (ret) { 924 mad_send_wc->status = IB_WC_GENERAL_ERR; 925 return IB_RMPP_RESULT_PROCESSED; 926 } 927 return IB_RMPP_RESULT_CONSUMED; 928} 929 930int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) 931{ 932 struct ib_rmpp_mad *rmpp_mad; 933 int ret; 934 935 rmpp_mad = mad_send_wr->send_buf.mad; 936 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 937 IB_MGMT_RMPP_FLAG_ACTIVE)) 938 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 939 940 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) 941 return IB_RMPP_RESULT_PROCESSED; 942 943 mad_send_wr->seg_num = mad_send_wr->last_ack; 944 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg; 945 946 ret = send_next_seg(mad_send_wr); 947 if (ret) 948 return IB_RMPP_RESULT_PROCESSED; 949 950 return IB_RMPP_RESULT_CONSUMED; 951} 952