1 /* 2 * Copyright (c) 2005 Intel Inc. All rights reserved. 3 * Copyright (c) 2005 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 * $Id: mad_rmpp.c 1921 2005-03-02 22:58:44Z sean.hefty $ 34 */ 35 36 #include <linux/dma-mapping.h> 37 38 #include "mad_priv.h" 39 #include "mad_rmpp.h" 40 41 enum rmpp_state { 42 RMPP_STATE_ACTIVE, 43 RMPP_STATE_TIMEOUT, 44 RMPP_STATE_COMPLETE 45 }; 46 47 struct mad_rmpp_recv { 48 struct ib_mad_agent_private *agent; 49 struct list_head list; 50 struct work_struct timeout_work; 51 struct work_struct cleanup_work; 52 wait_queue_head_t wait; 53 enum rmpp_state state; 54 spinlock_t lock; 55 atomic_t refcount; 56 57 struct ib_ah *ah; 58 struct ib_mad_recv_wc *rmpp_wc; 59 struct ib_mad_recv_buf *cur_seg_buf; 60 int last_ack; 61 int seg_num; 62 int newwin; 63 64 __be64 tid; 65 u32 src_qp; 66 u16 slid; 67 u8 mgmt_class; 68 u8 class_version; 69 u8 method; 70 }; 71 72 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 73 { 74 atomic_dec(&rmpp_recv->refcount); 75 wait_event(rmpp_recv->wait, !atomic_read(&rmpp_recv->refcount)); 76 ib_destroy_ah(rmpp_recv->ah); 77 kfree(rmpp_recv); 78 } 79 80 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) 81 { 82 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; 83 unsigned long flags; 84 85 spin_lock_irqsave(&agent->lock, flags); 86 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 87 cancel_delayed_work(&rmpp_recv->timeout_work); 88 cancel_delayed_work(&rmpp_recv->cleanup_work); 89 } 90 spin_unlock_irqrestore(&agent->lock, flags); 91 92 flush_workqueue(agent->qp_info->port_priv->wq); 93 94 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, 95 &agent->rmpp_list, list) { 96 list_del(&rmpp_recv->list); 97 if (rmpp_recv->state != RMPP_STATE_COMPLETE) 98 ib_free_recv_mad(rmpp_recv->rmpp_wc); 99 destroy_rmpp_recv(rmpp_recv); 100 } 101 } 102 103 static int data_offset(u8 mgmt_class) 104 { 105 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM) 106 return offsetof(struct ib_sa_mad, data); 107 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) && 108 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) 109 return offsetof(struct ib_vendor_mad, data); 110 else 111 return offsetof(struct ib_rmpp_mad, data); 112 } 113 114 static void format_ack(struct ib_rmpp_mad *ack, 115 struct ib_rmpp_mad *data, 116 struct mad_rmpp_recv *rmpp_recv) 117 { 118 unsigned long flags; 119 120 memcpy(&ack->mad_hdr, &data->mad_hdr, 121 data_offset(data->mad_hdr.mgmt_class)); 122 123 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 124 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; 125 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 126 127 spin_lock_irqsave(&rmpp_recv->lock, flags); 128 rmpp_recv->last_ack = rmpp_recv->seg_num; 129 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); 130 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); 131 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 132 } 133 134 static void ack_recv(struct mad_rmpp_recv *rmpp_recv, 135 struct ib_mad_recv_wc *recv_wc) 136 { 137 struct ib_mad_send_buf *msg; 138 struct ib_send_wr *bad_send_wr; 139 int hdr_len, ret; 140 141 hdr_len = sizeof(struct ib_mad_hdr) + sizeof(struct ib_rmpp_hdr); 142 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, 143 recv_wc->wc->pkey_index, rmpp_recv->ah, 1, 144 hdr_len, sizeof(struct ib_rmpp_mad) - hdr_len, 145 GFP_KERNEL); 146 if (!msg) 147 return; 148 149 format_ack((struct ib_rmpp_mad *) msg->mad, 150 (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); 151 ret = ib_post_send_mad(&rmpp_recv->agent->agent, &msg->send_wr, 152 &bad_send_wr); 153 if (ret) 154 ib_free_send_mad(msg); 155 } 156 157 static int alloc_response_msg(struct ib_mad_agent *agent, 158 struct ib_mad_recv_wc *recv_wc, 159 struct ib_mad_send_buf **msg) 160 { 161 struct ib_mad_send_buf *m; 162 struct ib_ah *ah; 163 int hdr_len; 164 165 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, 166 recv_wc->recv_buf.grh, agent->port_num); 167 if (IS_ERR(ah)) 168 return PTR_ERR(ah); 169 170 hdr_len = sizeof(struct ib_mad_hdr) + sizeof(struct ib_rmpp_hdr); 171 m = ib_create_send_mad(agent, recv_wc->wc->src_qp, 172 recv_wc->wc->pkey_index, ah, 1, hdr_len, 173 sizeof(struct ib_rmpp_mad) - hdr_len, 174 GFP_KERNEL); 175 if (IS_ERR(m)) { 176 ib_destroy_ah(ah); 177 return PTR_ERR(m); 178 } 179 *msg = m; 180 return 0; 181 } 182 183 static void free_msg(struct ib_mad_send_buf *msg) 184 { 185 ib_destroy_ah(msg->send_wr.wr.ud.ah); 186 ib_free_send_mad(msg); 187 } 188 189 static void nack_recv(struct ib_mad_agent_private *agent, 190 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) 191 { 192 struct ib_mad_send_buf *msg; 193 struct ib_rmpp_mad *rmpp_mad; 194 struct ib_send_wr *bad_send_wr; 195 int ret; 196 197 ret = alloc_response_msg(&agent->agent, recv_wc, &msg); 198 if (ret) 199 return; 200 201 rmpp_mad = (struct ib_rmpp_mad *) msg->mad; 202 memcpy(rmpp_mad, recv_wc->recv_buf.mad, 203 data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class)); 204 205 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 206 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; 207 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; 208 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 209 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; 210 rmpp_mad->rmpp_hdr.seg_num = 0; 211 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 212 213 ret = ib_post_send_mad(&agent->agent, &msg->send_wr, &bad_send_wr); 214 if (ret) 215 free_msg(msg); 216 } 217 218 static void recv_timeout_handler(void *data) 219 { 220 struct mad_rmpp_recv *rmpp_recv = data; 221 struct ib_mad_recv_wc *rmpp_wc; 222 unsigned long flags; 223 224 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 225 if (rmpp_recv->state != RMPP_STATE_ACTIVE) { 226 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 227 return; 228 } 229 rmpp_recv->state = RMPP_STATE_TIMEOUT; 230 list_del(&rmpp_recv->list); 231 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 232 233 rmpp_wc = rmpp_recv->rmpp_wc; 234 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); 235 destroy_rmpp_recv(rmpp_recv); 236 ib_free_recv_mad(rmpp_wc); 237 } 238 239 static void recv_cleanup_handler(void *data) 240 { 241 struct mad_rmpp_recv *rmpp_recv = data; 242 unsigned long flags; 243 244 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 245 list_del(&rmpp_recv->list); 246 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 247 destroy_rmpp_recv(rmpp_recv); 248 } 249 250 static struct mad_rmpp_recv * 251 create_rmpp_recv(struct ib_mad_agent_private *agent, 252 struct ib_mad_recv_wc *mad_recv_wc) 253 { 254 struct mad_rmpp_recv *rmpp_recv; 255 struct ib_mad_hdr *mad_hdr; 256 257 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); 258 if (!rmpp_recv) 259 return NULL; 260 261 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, 262 mad_recv_wc->wc, 263 mad_recv_wc->recv_buf.grh, 264 agent->agent.port_num); 265 if (IS_ERR(rmpp_recv->ah)) 266 goto error; 267 268 rmpp_recv->agent = agent; 269 init_waitqueue_head(&rmpp_recv->wait); 270 INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv); 271 INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv); 272 spin_lock_init(&rmpp_recv->lock); 273 rmpp_recv->state = RMPP_STATE_ACTIVE; 274 atomic_set(&rmpp_recv->refcount, 1); 275 276 rmpp_recv->rmpp_wc = mad_recv_wc; 277 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; 278 rmpp_recv->newwin = 1; 279 rmpp_recv->seg_num = 1; 280 rmpp_recv->last_ack = 0; 281 282 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 283 rmpp_recv->tid = mad_hdr->tid; 284 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; 285 rmpp_recv->slid = mad_recv_wc->wc->slid; 286 rmpp_recv->mgmt_class = mad_hdr->mgmt_class; 287 rmpp_recv->class_version = mad_hdr->class_version; 288 rmpp_recv->method = mad_hdr->method; 289 return rmpp_recv; 290 291 error: kfree(rmpp_recv); 292 return NULL; 293 } 294 295 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 296 { 297 if (atomic_dec_and_test(&rmpp_recv->refcount)) 298 wake_up(&rmpp_recv->wait); 299 } 300 301 static struct mad_rmpp_recv * 302 find_rmpp_recv(struct ib_mad_agent_private *agent, 303 struct ib_mad_recv_wc *mad_recv_wc) 304 { 305 struct mad_rmpp_recv *rmpp_recv; 306 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 307 308 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 309 if (rmpp_recv->tid == mad_hdr->tid && 310 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && 311 rmpp_recv->slid == mad_recv_wc->wc->slid && 312 rmpp_recv->mgmt_class == mad_hdr->mgmt_class && 313 rmpp_recv->class_version == mad_hdr->class_version && 314 rmpp_recv->method == mad_hdr->method) 315 return rmpp_recv; 316 } 317 return NULL; 318 } 319 320 static struct mad_rmpp_recv * 321 acquire_rmpp_recv(struct ib_mad_agent_private *agent, 322 struct ib_mad_recv_wc *mad_recv_wc) 323 { 324 struct mad_rmpp_recv *rmpp_recv; 325 unsigned long flags; 326 327 spin_lock_irqsave(&agent->lock, flags); 328 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 329 if (rmpp_recv) 330 atomic_inc(&rmpp_recv->refcount); 331 spin_unlock_irqrestore(&agent->lock, flags); 332 return rmpp_recv; 333 } 334 335 static struct mad_rmpp_recv * 336 insert_rmpp_recv(struct ib_mad_agent_private *agent, 337 struct mad_rmpp_recv *rmpp_recv) 338 { 339 struct mad_rmpp_recv *cur_rmpp_recv; 340 341 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); 342 if (!cur_rmpp_recv) 343 list_add_tail(&rmpp_recv->list, &agent->rmpp_list); 344 345 return cur_rmpp_recv; 346 } 347 348 static inline int get_last_flag(struct ib_mad_recv_buf *seg) 349 { 350 struct ib_rmpp_mad *rmpp_mad; 351 352 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 353 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; 354 } 355 356 static inline int get_seg_num(struct ib_mad_recv_buf *seg) 357 { 358 struct ib_rmpp_mad *rmpp_mad; 359 360 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 361 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 362 } 363 364 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, 365 struct ib_mad_recv_buf *seg) 366 { 367 if (seg->list.next == rmpp_list) 368 return NULL; 369 370 return container_of(seg->list.next, struct ib_mad_recv_buf, list); 371 } 372 373 static inline int window_size(struct ib_mad_agent_private *agent) 374 { 375 return max(agent->qp_info->recv_queue.max_active >> 3, 1); 376 } 377 378 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, 379 int seg_num) 380 { 381 struct ib_mad_recv_buf *seg_buf; 382 int cur_seg_num; 383 384 list_for_each_entry_reverse(seg_buf, rmpp_list, list) { 385 cur_seg_num = get_seg_num(seg_buf); 386 if (seg_num > cur_seg_num) 387 return seg_buf; 388 if (seg_num == cur_seg_num) 389 break; 390 } 391 return NULL; 392 } 393 394 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, 395 struct ib_mad_recv_buf *new_buf) 396 { 397 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; 398 399 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { 400 rmpp_recv->cur_seg_buf = new_buf; 401 rmpp_recv->seg_num++; 402 new_buf = get_next_seg(rmpp_list, new_buf); 403 } 404 } 405 406 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) 407 { 408 struct ib_rmpp_mad *rmpp_mad; 409 int hdr_size, data_size, pad; 410 411 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; 412 413 hdr_size = data_offset(rmpp_mad->mad_hdr.mgmt_class); 414 data_size = sizeof(struct ib_rmpp_mad) - hdr_size; 415 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 416 if (pad > IB_MGMT_RMPP_DATA || pad < 0) 417 pad = 0; 418 419 return hdr_size + rmpp_recv->seg_num * data_size - pad; 420 } 421 422 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) 423 { 424 struct ib_mad_recv_wc *rmpp_wc; 425 426 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); 427 if (rmpp_recv->seg_num > 1) 428 cancel_delayed_work(&rmpp_recv->timeout_work); 429 430 rmpp_wc = rmpp_recv->rmpp_wc; 431 rmpp_wc->mad_len = get_mad_len(rmpp_recv); 432 /* 10 seconds until we can find the packet lifetime */ 433 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, 434 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); 435 return rmpp_wc; 436 } 437 438 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf) 439 { 440 struct ib_mad_recv_buf *seg_buf; 441 struct ib_rmpp_mad *rmpp_mad; 442 void *data; 443 int size, len, offset; 444 u8 flags; 445 446 len = mad_recv_wc->mad_len; 447 if (len <= sizeof(struct ib_mad)) { 448 memcpy(buf, mad_recv_wc->recv_buf.mad, len); 449 return; 450 } 451 452 offset = data_offset(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 453 454 list_for_each_entry(seg_buf, &mad_recv_wc->rmpp_list, list) { 455 rmpp_mad = (struct ib_rmpp_mad *)seg_buf->mad; 456 flags = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr); 457 458 if (flags & IB_MGMT_RMPP_FLAG_FIRST) { 459 data = rmpp_mad; 460 size = sizeof(*rmpp_mad); 461 } else { 462 data = (void *) rmpp_mad + offset; 463 if (flags & IB_MGMT_RMPP_FLAG_LAST) 464 size = len; 465 else 466 size = sizeof(*rmpp_mad) - offset; 467 } 468 469 memcpy(buf, data, size); 470 len -= size; 471 buf += size; 472 } 473 } 474 EXPORT_SYMBOL(ib_coalesce_recv_mad); 475 476 static struct ib_mad_recv_wc * 477 continue_rmpp(struct ib_mad_agent_private *agent, 478 struct ib_mad_recv_wc *mad_recv_wc) 479 { 480 struct mad_rmpp_recv *rmpp_recv; 481 struct ib_mad_recv_buf *prev_buf; 482 struct ib_mad_recv_wc *done_wc; 483 int seg_num; 484 unsigned long flags; 485 486 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); 487 if (!rmpp_recv) 488 goto drop1; 489 490 seg_num = get_seg_num(&mad_recv_wc->recv_buf); 491 492 spin_lock_irqsave(&rmpp_recv->lock, flags); 493 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || 494 (seg_num > rmpp_recv->newwin)) 495 goto drop3; 496 497 if ((seg_num <= rmpp_recv->last_ack) || 498 (rmpp_recv->state == RMPP_STATE_COMPLETE)) { 499 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 500 ack_recv(rmpp_recv, mad_recv_wc); 501 goto drop2; 502 } 503 504 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); 505 if (!prev_buf) 506 goto drop3; 507 508 done_wc = NULL; 509 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); 510 if (rmpp_recv->cur_seg_buf == prev_buf) { 511 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); 512 if (get_last_flag(rmpp_recv->cur_seg_buf)) { 513 rmpp_recv->state = RMPP_STATE_COMPLETE; 514 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 515 done_wc = complete_rmpp(rmpp_recv); 516 goto out; 517 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { 518 rmpp_recv->newwin += window_size(agent); 519 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 520 ack_recv(rmpp_recv, mad_recv_wc); 521 goto out; 522 } 523 } 524 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 525 out: 526 deref_rmpp_recv(rmpp_recv); 527 return done_wc; 528 529 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); 530 drop2: deref_rmpp_recv(rmpp_recv); 531 drop1: ib_free_recv_mad(mad_recv_wc); 532 return NULL; 533 } 534 535 static struct ib_mad_recv_wc * 536 start_rmpp(struct ib_mad_agent_private *agent, 537 struct ib_mad_recv_wc *mad_recv_wc) 538 { 539 struct mad_rmpp_recv *rmpp_recv; 540 unsigned long flags; 541 542 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); 543 if (!rmpp_recv) { 544 ib_free_recv_mad(mad_recv_wc); 545 return NULL; 546 } 547 548 spin_lock_irqsave(&agent->lock, flags); 549 if (insert_rmpp_recv(agent, rmpp_recv)) { 550 spin_unlock_irqrestore(&agent->lock, flags); 551 /* duplicate first MAD */ 552 destroy_rmpp_recv(rmpp_recv); 553 return continue_rmpp(agent, mad_recv_wc); 554 } 555 atomic_inc(&rmpp_recv->refcount); 556 557 if (get_last_flag(&mad_recv_wc->recv_buf)) { 558 rmpp_recv->state = RMPP_STATE_COMPLETE; 559 spin_unlock_irqrestore(&agent->lock, flags); 560 complete_rmpp(rmpp_recv); 561 } else { 562 spin_unlock_irqrestore(&agent->lock, flags); 563 /* 40 seconds until we can find the packet lifetimes */ 564 queue_delayed_work(agent->qp_info->port_priv->wq, 565 &rmpp_recv->timeout_work, 566 msecs_to_jiffies(40000)); 567 rmpp_recv->newwin += window_size(agent); 568 ack_recv(rmpp_recv, mad_recv_wc); 569 mad_recv_wc = NULL; 570 } 571 deref_rmpp_recv(rmpp_recv); 572 return mad_recv_wc; 573 } 574 575 static inline u64 get_seg_addr(struct ib_mad_send_wr_private *mad_send_wr) 576 { 577 return mad_send_wr->sg_list[0].addr + mad_send_wr->data_offset + 578 (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset) * 579 (mad_send_wr->seg_num - 1); 580 } 581 582 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) 583 { 584 struct ib_rmpp_mad *rmpp_mad; 585 int timeout; 586 u32 paylen; 587 588 rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr; 589 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 590 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(mad_send_wr->seg_num); 591 592 if (mad_send_wr->seg_num == 1) { 593 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; 594 paylen = mad_send_wr->total_seg * IB_MGMT_RMPP_DATA - 595 mad_send_wr->pad; 596 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 597 mad_send_wr->sg_list[0].length = sizeof(struct ib_rmpp_mad); 598 } else { 599 mad_send_wr->send_wr.num_sge = 2; 600 mad_send_wr->sg_list[0].length = mad_send_wr->data_offset; 601 mad_send_wr->sg_list[1].addr = get_seg_addr(mad_send_wr); 602 mad_send_wr->sg_list[1].length = sizeof(struct ib_rmpp_mad) - 603 mad_send_wr->data_offset; 604 mad_send_wr->sg_list[1].lkey = mad_send_wr->sg_list[0].lkey; 605 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 606 } 607 608 if (mad_send_wr->seg_num == mad_send_wr->total_seg) { 609 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; 610 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad; 611 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 612 } 613 614 /* 2 seconds for an ACK until we can find the packet lifetime */ 615 timeout = mad_send_wr->send_wr.wr.ud.timeout_ms; 616 if (!timeout || timeout > 2000) 617 mad_send_wr->timeout = msecs_to_jiffies(2000); 618 mad_send_wr->seg_num++; 619 return ib_send_mad(mad_send_wr); 620 } 621 622 static void abort_send(struct ib_mad_agent_private *agent, __be64 tid, 623 u8 rmpp_status) 624 { 625 struct ib_mad_send_wr_private *mad_send_wr; 626 struct ib_mad_send_wc wc; 627 unsigned long flags; 628 629 spin_lock_irqsave(&agent->lock, flags); 630 mad_send_wr = ib_find_send_mad(agent, tid); 631 if (!mad_send_wr) 632 goto out; /* Unmatched send */ 633 634 if ((mad_send_wr->last_ack == mad_send_wr->total_seg) || 635 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 636 goto out; /* Send is already done */ 637 638 ib_mark_mad_done(mad_send_wr); 639 spin_unlock_irqrestore(&agent->lock, flags); 640 641 wc.status = IB_WC_REM_ABORT_ERR; 642 wc.vendor_err = rmpp_status; 643 wc.wr_id = mad_send_wr->wr_id; 644 ib_mad_complete_send_wr(mad_send_wr, &wc); 645 return; 646 out: 647 spin_unlock_irqrestore(&agent->lock, flags); 648 } 649 650 static void process_rmpp_ack(struct ib_mad_agent_private *agent, 651 struct ib_mad_recv_wc *mad_recv_wc) 652 { 653 struct ib_mad_send_wr_private *mad_send_wr; 654 struct ib_rmpp_mad *rmpp_mad; 655 unsigned long flags; 656 int seg_num, newwin, ret; 657 658 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 659 if (rmpp_mad->rmpp_hdr.rmpp_status) { 660 abort_send(agent, rmpp_mad->mad_hdr.tid, 661 IB_MGMT_RMPP_STATUS_BAD_STATUS); 662 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 663 return; 664 } 665 666 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 667 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 668 if (newwin < seg_num) { 669 abort_send(agent, rmpp_mad->mad_hdr.tid, 670 IB_MGMT_RMPP_STATUS_W2S); 671 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 672 return; 673 } 674 675 spin_lock_irqsave(&agent->lock, flags); 676 mad_send_wr = ib_find_send_mad(agent, rmpp_mad->mad_hdr.tid); 677 if (!mad_send_wr) 678 goto out; /* Unmatched ACK */ 679 680 if ((mad_send_wr->last_ack == mad_send_wr->total_seg) || 681 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 682 goto out; /* Send is already done */ 683 684 if (seg_num > mad_send_wr->total_seg || seg_num > mad_send_wr->newwin) { 685 spin_unlock_irqrestore(&agent->lock, flags); 686 abort_send(agent, rmpp_mad->mad_hdr.tid, 687 IB_MGMT_RMPP_STATUS_S2B); 688 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 689 return; 690 } 691 692 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) 693 goto out; /* Old ACK */ 694 695 if (seg_num > mad_send_wr->last_ack) { 696 mad_send_wr->last_ack = seg_num; 697 mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries; 698 } 699 mad_send_wr->newwin = newwin; 700 if (mad_send_wr->last_ack == mad_send_wr->total_seg) { 701 /* If no response is expected, the ACK completes the send */ 702 if (!mad_send_wr->send_wr.wr.ud.timeout_ms) { 703 struct ib_mad_send_wc wc; 704 705 ib_mark_mad_done(mad_send_wr); 706 spin_unlock_irqrestore(&agent->lock, flags); 707 708 wc.status = IB_WC_SUCCESS; 709 wc.vendor_err = 0; 710 wc.wr_id = mad_send_wr->wr_id; 711 ib_mad_complete_send_wr(mad_send_wr, &wc); 712 return; 713 } 714 if (mad_send_wr->refcount == 1) 715 ib_reset_mad_timeout(mad_send_wr, mad_send_wr-> 716 send_wr.wr.ud.timeout_ms); 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->total_seg) { 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_del(&mad_send_wr->agent_list); 727 list_add_tail(&mad_send_wr->agent_list, 728 &mad_send_wr->mad_agent_priv->send_list); 729 } 730 out: 731 spin_unlock_irqrestore(&agent->lock, flags); 732 } 733 734 static struct ib_mad_recv_wc * 735 process_rmpp_data(struct ib_mad_agent_private *agent, 736 struct ib_mad_recv_wc *mad_recv_wc) 737 { 738 struct ib_rmpp_hdr *rmpp_hdr; 739 u8 rmpp_status; 740 741 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; 742 743 if (rmpp_hdr->rmpp_status) { 744 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; 745 goto bad; 746 } 747 748 if (rmpp_hdr->seg_num == __constant_htonl(1)) { 749 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { 750 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 751 goto bad; 752 } 753 return start_rmpp(agent, mad_recv_wc); 754 } else { 755 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { 756 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 757 goto bad; 758 } 759 return continue_rmpp(agent, mad_recv_wc); 760 } 761 bad: 762 nack_recv(agent, mad_recv_wc, rmpp_status); 763 ib_free_recv_mad(mad_recv_wc); 764 return NULL; 765 } 766 767 static void process_rmpp_stop(struct ib_mad_agent_private *agent, 768 struct ib_mad_recv_wc *mad_recv_wc) 769 { 770 struct ib_rmpp_mad *rmpp_mad; 771 772 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 773 774 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { 775 abort_send(agent, rmpp_mad->mad_hdr.tid, 776 IB_MGMT_RMPP_STATUS_BAD_STATUS); 777 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 778 } else 779 abort_send(agent, rmpp_mad->mad_hdr.tid, 780 rmpp_mad->rmpp_hdr.rmpp_status); 781 } 782 783 static void process_rmpp_abort(struct ib_mad_agent_private *agent, 784 struct ib_mad_recv_wc *mad_recv_wc) 785 { 786 struct ib_rmpp_mad *rmpp_mad; 787 788 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 789 790 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || 791 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { 792 abort_send(agent, rmpp_mad->mad_hdr.tid, 793 IB_MGMT_RMPP_STATUS_BAD_STATUS); 794 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 795 } else 796 abort_send(agent, rmpp_mad->mad_hdr.tid, 797 rmpp_mad->rmpp_hdr.rmpp_status); 798 } 799 800 struct ib_mad_recv_wc * 801 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, 802 struct ib_mad_recv_wc *mad_recv_wc) 803 { 804 struct ib_rmpp_mad *rmpp_mad; 805 806 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 807 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) 808 return mad_recv_wc; 809 810 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { 811 abort_send(agent, rmpp_mad->mad_hdr.tid, 812 IB_MGMT_RMPP_STATUS_UNV); 813 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 814 goto out; 815 } 816 817 switch (rmpp_mad->rmpp_hdr.rmpp_type) { 818 case IB_MGMT_RMPP_TYPE_DATA: 819 return process_rmpp_data(agent, mad_recv_wc); 820 case IB_MGMT_RMPP_TYPE_ACK: 821 process_rmpp_ack(agent, mad_recv_wc); 822 break; 823 case IB_MGMT_RMPP_TYPE_STOP: 824 process_rmpp_stop(agent, mad_recv_wc); 825 break; 826 case IB_MGMT_RMPP_TYPE_ABORT: 827 process_rmpp_abort(agent, mad_recv_wc); 828 break; 829 default: 830 abort_send(agent, rmpp_mad->mad_hdr.tid, 831 IB_MGMT_RMPP_STATUS_BADT); 832 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 833 break; 834 } 835 out: 836 ib_free_recv_mad(mad_recv_wc); 837 return NULL; 838 } 839 840 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) 841 { 842 struct ib_rmpp_mad *rmpp_mad; 843 int i, total_len, ret; 844 845 rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr; 846 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 847 IB_MGMT_RMPP_FLAG_ACTIVE)) 848 return IB_RMPP_RESULT_UNHANDLED; 849 850 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) 851 return IB_RMPP_RESULT_INTERNAL; 852 853 if (mad_send_wr->send_wr.num_sge > 1) 854 return -EINVAL; /* TODO: support num_sge > 1 */ 855 856 mad_send_wr->seg_num = 1; 857 mad_send_wr->newwin = 1; 858 mad_send_wr->data_offset = data_offset(rmpp_mad->mad_hdr.mgmt_class); 859 860 total_len = 0; 861 for (i = 0; i < mad_send_wr->send_wr.num_sge; i++) 862 total_len += mad_send_wr->send_wr.sg_list[i].length; 863 864 mad_send_wr->total_seg = (total_len - mad_send_wr->data_offset) / 865 (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset); 866 mad_send_wr->pad = total_len - offsetof(struct ib_rmpp_mad, data) - 867 be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 868 869 /* We need to wait for the final ACK even if there isn't a response */ 870 mad_send_wr->refcount += (mad_send_wr->timeout == 0); 871 ret = send_next_seg(mad_send_wr); 872 if (!ret) 873 return IB_RMPP_RESULT_CONSUMED; 874 return ret; 875 } 876 877 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, 878 struct ib_mad_send_wc *mad_send_wc) 879 { 880 struct ib_rmpp_mad *rmpp_mad; 881 struct ib_mad_send_buf *msg; 882 int ret; 883 884 rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr; 885 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 886 IB_MGMT_RMPP_FLAG_ACTIVE)) 887 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 888 889 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { 890 msg = (struct ib_mad_send_buf *) (unsigned long) 891 mad_send_wc->wr_id; 892 if (rmpp_mad->rmpp_hdr.rmpp_type == IB_MGMT_RMPP_TYPE_ACK) 893 ib_free_send_mad(msg); 894 else 895 free_msg(msg); 896 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ 897 } 898 899 if (mad_send_wc->status != IB_WC_SUCCESS || 900 mad_send_wr->status != IB_WC_SUCCESS) 901 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ 902 903 if (!mad_send_wr->timeout) 904 return IB_RMPP_RESULT_PROCESSED; /* Response received */ 905 906 if (mad_send_wr->last_ack == mad_send_wr->total_seg) { 907 mad_send_wr->timeout = 908 msecs_to_jiffies(mad_send_wr->send_wr.wr.ud.timeout_ms); 909 return IB_RMPP_RESULT_PROCESSED; /* Send done */ 910 } 911 912 if (mad_send_wr->seg_num > mad_send_wr->newwin || 913 mad_send_wr->seg_num > mad_send_wr->total_seg) 914 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ 915 916 ret = send_next_seg(mad_send_wr); 917 if (ret) { 918 mad_send_wc->status = IB_WC_GENERAL_ERR; 919 return IB_RMPP_RESULT_PROCESSED; 920 } 921 return IB_RMPP_RESULT_CONSUMED; 922 } 923 924 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) 925 { 926 struct ib_rmpp_mad *rmpp_mad; 927 int ret; 928 929 rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr; 930 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 931 IB_MGMT_RMPP_FLAG_ACTIVE)) 932 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 933 934 if (mad_send_wr->last_ack == mad_send_wr->total_seg) 935 return IB_RMPP_RESULT_PROCESSED; 936 937 mad_send_wr->seg_num = mad_send_wr->last_ack + 1; 938 ret = send_next_seg(mad_send_wr); 939 if (ret) 940 return IB_RMPP_RESULT_PROCESSED; 941 942 return IB_RMPP_RESULT_CONSUMED; 943 } 944