drivers/infiniband/core/mad_rmpp.c

   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 <linux/slab.h>
  35
  36 #include "mad_priv.h"
  37 #include "mad_rmpp.h"
  38
  39 enum rmpp_state {
  40         RMPP_STATE_ACTIVE,
  41         RMPP_STATE_TIMEOUT,
  42         RMPP_STATE_COMPLETE,
  43         RMPP_STATE_CANCELING
  44 };
  45
  46 struct mad_rmpp_recv {
  47         struct ib_mad_agent_private *agent;
  48         struct list_head list;
  49         struct delayed_work timeout_work;
  50         struct delayed_work cleanup_work;
  51         struct completion comp;
  52         enum rmpp_state state;
  53         spinlock_t lock;
  54         atomic_t refcount;
  55
  56         struct ib_ah *ah;
  57         struct ib_mad_recv_wc *rmpp_wc;
  58         struct ib_mad_recv_buf *cur_seg_buf;
  59         int last_ack;
  60         int seg_num;
  61         int newwin;
  62         int repwin;
  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 inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  73 {
  74         if (atomic_dec_and_test(&rmpp_recv->refcount))
  75                 complete(&rmpp_recv->comp);
  76 }
  77
  78 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  79 {
  80         deref_rmpp_recv(rmpp_recv);
  81         wait_for_completion(&rmpp_recv->comp);
  82         ib_destroy_ah(rmpp_recv->ah);
  83         kfree(rmpp_recv);
  84 }
  85
  86 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
  87 {
  88         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
  89         unsigned long flags;
  90
  91         spin_lock_irqsave(&agent->lock, flags);
  92         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
  93                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
  94                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
  95                 rmpp_recv->state = RMPP_STATE_CANCELING;
  96         }
  97         spin_unlock_irqrestore(&agent->lock, flags);
  98
  99         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 100                 cancel_delayed_work(&rmpp_recv->timeout_work);
 101                 cancel_delayed_work(&rmpp_recv->cleanup_work);
 102         }
 103
 104         flush_workqueue(agent->qp_info->port_priv->wq);
 105
 106         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
 107                                  &agent->rmpp_list, list) {
 108                 list_del(&rmpp_recv->list);
 109                 destroy_rmpp_recv(rmpp_recv);
 110         }
 111 }
 112
 113 static void format_ack(struct ib_mad_send_buf *msg,
 114                        struct ib_rmpp_mad *data,
 115                        struct mad_rmpp_recv *rmpp_recv)
 116 {
 117         struct ib_rmpp_mad *ack = msg->mad;
 118         unsigned long flags;
 119
 120         memcpy(ack, &data->mad_hdr, msg->hdr_len);
 121
 122         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 123         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
 124         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 125
 126         spin_lock_irqsave(&rmpp_recv->lock, flags);
 127         rmpp_recv->last_ack = rmpp_recv->seg_num;
 128         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
 129         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
 130         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 131 }
 132
 133 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
 134                      struct ib_mad_recv_wc *recv_wc)
 135 {
 136         struct ib_mad_send_buf *msg;
 137         int ret, hdr_len;
 138
 139         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 140         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 141                                  recv_wc->wc->pkey_index, 1, hdr_len,
 142                                  0, GFP_KERNEL,
 143                                  IB_MGMT_BASE_VERSION);
 144         if (IS_ERR(msg))
 145                 return;
 146
 147         format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
 148         msg->ah = rmpp_recv->ah;
 149         ret = ib_post_send_mad(msg, NULL);
 150         if (ret)
 151                 ib_free_send_mad(msg);
 152 }
 153
 154 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
 155                                                   struct ib_mad_recv_wc *recv_wc)
 156 {
 157         struct ib_mad_send_buf *msg;
 158         struct ib_ah *ah;
 159         int hdr_len;
 160
 161         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
 162                                   recv_wc->recv_buf.grh, agent->port_num);
 163         if (IS_ERR(ah))
 164                 return (void *) ah;
 165
 166         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 167         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
 168                                  recv_wc->wc->pkey_index, 1,
 169                                  hdr_len, 0, GFP_KERNEL,
 170                                  IB_MGMT_BASE_VERSION);
 171         if (IS_ERR(msg))
 172                 ib_destroy_ah(ah);
 173         else {
 174                 msg->ah = ah;
 175                 msg->context[0] = ah;
 176         }
 177
 178         return msg;
 179 }
 180
 181 static void ack_ds_ack(struct ib_mad_agent_private *agent,
 182                        struct ib_mad_recv_wc *recv_wc)
 183 {
 184         struct ib_mad_send_buf *msg;
 185         struct ib_rmpp_mad *rmpp_mad;
 186         int ret;
 187
 188         msg = alloc_response_msg(&agent->agent, recv_wc);
 189         if (IS_ERR(msg))
 190                 return;
 191
 192         rmpp_mad = msg->mad;
 193         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 194
 195         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 196         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 197         rmpp_mad->rmpp_hdr.seg_num = 0;
 198         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
 199
 200         ret = ib_post_send_mad(msg, NULL);
 201         if (ret) {
 202                 ib_destroy_ah(msg->ah);
 203                 ib_free_send_mad(msg);
 204         }
 205 }
 206
 207 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 208 {
 209         if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
 210                 ib_destroy_ah(mad_send_wc->send_buf->ah);
 211         ib_free_send_mad(mad_send_wc->send_buf);
 212 }
 213
 214 static void nack_recv(struct ib_mad_agent_private *agent,
 215                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
 216 {
 217         struct ib_mad_send_buf *msg;
 218         struct ib_rmpp_mad *rmpp_mad;
 219         int ret;
 220
 221         msg = alloc_response_msg(&agent->agent, recv_wc);
 222         if (IS_ERR(msg))
 223                 return;
 224
 225         rmpp_mad = msg->mad;
 226         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 227
 228         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 229         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
 230         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
 231         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 232         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
 233         rmpp_mad->rmpp_hdr.seg_num = 0;
 234         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 235
 236         ret = ib_post_send_mad(msg, NULL);
 237         if (ret) {
 238                 ib_destroy_ah(msg->ah);
 239                 ib_free_send_mad(msg);
 240         }
 241 }
 242
 243 static void recv_timeout_handler(struct work_struct *work)
 244 {
 245         struct mad_rmpp_recv *rmpp_recv =
 246                 container_of(work, struct mad_rmpp_recv, timeout_work.work);
 247         struct ib_mad_recv_wc *rmpp_wc;
 248         unsigned long flags;
 249
 250         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 251         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 252                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 253                 return;
 254         }
 255         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 256         list_del(&rmpp_recv->list);
 257         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 258
 259         rmpp_wc = rmpp_recv->rmpp_wc;
 260         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 261         destroy_rmpp_recv(rmpp_recv);
 262         ib_free_recv_mad(rmpp_wc);
 263 }
 264
 265 static void recv_cleanup_handler(struct work_struct *work)
 266 {
 267         struct mad_rmpp_recv *rmpp_recv =
 268                 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
 269         unsigned long flags;
 270
 271         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 272         if (rmpp_recv->state == RMPP_STATE_CANCELING) {
 273                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 274                 return;
 275         }
 276         list_del(&rmpp_recv->list);
 277         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 278         destroy_rmpp_recv(rmpp_recv);
 279 }
 280
 281 static struct mad_rmpp_recv *
 282 create_rmpp_recv(struct ib_mad_agent_private *agent,
 283                  struct ib_mad_recv_wc *mad_recv_wc)
 284 {
 285         struct mad_rmpp_recv *rmpp_recv;
 286         struct ib_mad_hdr *mad_hdr;
 287
 288         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 289         if (!rmpp_recv)
 290                 return NULL;
 291
 292         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 293                                              mad_recv_wc->wc,
 294                                              mad_recv_wc->recv_buf.grh,
 295                                              agent->agent.port_num);
 296         if (IS_ERR(rmpp_recv->ah))
 297                 goto error;
 298
 299         rmpp_recv->agent = agent;
 300         init_completion(&rmpp_recv->comp);
 301         INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
 302         INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
 303         spin_lock_init(&rmpp_recv->lock);
 304         rmpp_recv->state = RMPP_STATE_ACTIVE;
 305         atomic_set(&rmpp_recv->refcount, 1);
 306
 307         rmpp_recv->rmpp_wc = mad_recv_wc;
 308         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 309         rmpp_recv->newwin = 1;
 310         rmpp_recv->seg_num = 1;
 311         rmpp_recv->last_ack = 0;
 312         rmpp_recv->repwin = 1;
 313
 314         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 315         rmpp_recv->tid = mad_hdr->tid;
 316         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 317         rmpp_recv->slid = mad_recv_wc->wc->slid;
 318         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 319         rmpp_recv->class_version = mad_hdr->class_version;
 320         rmpp_recv->method  = mad_hdr->method;
 321         return rmpp_recv;
 322
 323 error:  kfree(rmpp_recv);
 324         return NULL;
 325 }
 326
 327 static struct mad_rmpp_recv *
 328 find_rmpp_recv(struct ib_mad_agent_private *agent,
 329                struct ib_mad_recv_wc *mad_recv_wc)
 330 {
 331         struct mad_rmpp_recv *rmpp_recv;
 332         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 333
 334         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 335                 if (rmpp_recv->tid == mad_hdr->tid &&
 336                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 337                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 338                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 339                     rmpp_recv->class_version == mad_hdr->class_version &&
 340                     rmpp_recv->method == mad_hdr->method)
 341                         return rmpp_recv;
 342         }
 343         return NULL;
 344 }
 345
 346 static struct mad_rmpp_recv *
 347 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 348                   struct ib_mad_recv_wc *mad_recv_wc)
 349 {
 350         struct mad_rmpp_recv *rmpp_recv;
 351         unsigned long flags;
 352
 353         spin_lock_irqsave(&agent->lock, flags);
 354         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 355         if (rmpp_recv)
 356                 atomic_inc(&rmpp_recv->refcount);
 357         spin_unlock_irqrestore(&agent->lock, flags);
 358         return rmpp_recv;
 359 }
 360
 361 static struct mad_rmpp_recv *
 362 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 363                  struct mad_rmpp_recv *rmpp_recv)
 364 {
 365         struct mad_rmpp_recv *cur_rmpp_recv;
 366
 367         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 368         if (!cur_rmpp_recv)
 369                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 370
 371         return cur_rmpp_recv;
 372 }
 373
 374 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 375 {
 376         struct ib_rmpp_mad *rmpp_mad;
 377
 378         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 379         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 380 }
 381
 382 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 383 {
 384         struct ib_rmpp_mad *rmpp_mad;
 385
 386         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 387         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 388 }
 389
 390 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 391                                                     struct ib_mad_recv_buf *seg)
 392 {
 393         if (seg->list.next == rmpp_list)
 394                 return NULL;
 395
 396         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 397 }
 398
 399 static inline int window_size(struct ib_mad_agent_private *agent)
 400 {
 401         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 402 }
 403
 404 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 405                                                   int seg_num)
 406 {
 407         struct ib_mad_recv_buf *seg_buf;
 408         int cur_seg_num;
 409
 410         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 411                 cur_seg_num = get_seg_num(seg_buf);
 412                 if (seg_num > cur_seg_num)
 413                         return seg_buf;
 414                 if (seg_num == cur_seg_num)
 415                         break;
 416         }
 417         return NULL;
 418 }
 419
 420 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 421                            struct ib_mad_recv_buf *new_buf)
 422 {
 423         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 424
 425         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 426                 rmpp_recv->cur_seg_buf = new_buf;
 427                 rmpp_recv->seg_num++;
 428                 new_buf = get_next_seg(rmpp_list, new_buf);
 429         }
 430 }
 431
 432 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 433 {
 434         struct ib_rmpp_mad *rmpp_mad;
 435         int hdr_size, data_size, pad;
 436
 437         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 438
 439         hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 440         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 441         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 442         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 443                 pad = 0;
 444
 445         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 446 }
 447
 448 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 449 {
 450         struct ib_mad_recv_wc *rmpp_wc;
 451
 452         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 453         if (rmpp_recv->seg_num > 1)
 454                 cancel_delayed_work(&rmpp_recv->timeout_work);
 455
 456         rmpp_wc = rmpp_recv->rmpp_wc;
 457         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 458         /* 10 seconds until we can find the packet lifetime */
 459         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 460                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 461         return rmpp_wc;
 462 }
 463
 464 static struct ib_mad_recv_wc *
 465 continue_rmpp(struct ib_mad_agent_private *agent,
 466               struct ib_mad_recv_wc *mad_recv_wc)
 467 {
 468         struct mad_rmpp_recv *rmpp_recv;
 469         struct ib_mad_recv_buf *prev_buf;
 470         struct ib_mad_recv_wc *done_wc;
 471         int seg_num;
 472         unsigned long flags;
 473
 474         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 475         if (!rmpp_recv)
 476                 goto drop1;
 477
 478         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 479
 480         spin_lock_irqsave(&rmpp_recv->lock, flags);
 481         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 482             (seg_num > rmpp_recv->newwin))
 483                 goto drop3;
 484
 485         if ((seg_num <= rmpp_recv->last_ack) ||
 486             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 487                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 488                 ack_recv(rmpp_recv, mad_recv_wc);
 489                 goto drop2;
 490         }
 491
 492         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 493         if (!prev_buf)
 494                 goto drop3;
 495
 496         done_wc = NULL;
 497         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 498         if (rmpp_recv->cur_seg_buf == prev_buf) {
 499                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 500                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 501                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 502                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 503                         done_wc = complete_rmpp(rmpp_recv);
 504                         goto out;
 505                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 506                         rmpp_recv->newwin += window_size(agent);
 507                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 508                         ack_recv(rmpp_recv, mad_recv_wc);
 509                         goto out;
 510                 }
 511         }
 512         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 513 out:
 514         deref_rmpp_recv(rmpp_recv);
 515         return done_wc;
 516
 517 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 518 drop2:  deref_rmpp_recv(rmpp_recv);
 519 drop1:  ib_free_recv_mad(mad_recv_wc);
 520         return NULL;
 521 }
 522
 523 static struct ib_mad_recv_wc *
 524 start_rmpp(struct ib_mad_agent_private *agent,
 525            struct ib_mad_recv_wc *mad_recv_wc)
 526 {
 527         struct mad_rmpp_recv *rmpp_recv;
 528         unsigned long flags;
 529
 530         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 531         if (!rmpp_recv) {
 532                 ib_free_recv_mad(mad_recv_wc);
 533                 return NULL;
 534         }
 535
 536         spin_lock_irqsave(&agent->lock, flags);
 537         if (insert_rmpp_recv(agent, rmpp_recv)) {
 538                 spin_unlock_irqrestore(&agent->lock, flags);
 539                 /* duplicate first MAD */
 540                 destroy_rmpp_recv(rmpp_recv);
 541                 return continue_rmpp(agent, mad_recv_wc);
 542         }
 543         atomic_inc(&rmpp_recv->refcount);
 544
 545         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 546                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 547                 spin_unlock_irqrestore(&agent->lock, flags);
 548                 complete_rmpp(rmpp_recv);
 549         } else {
 550                 spin_unlock_irqrestore(&agent->lock, flags);
 551                 /* 40 seconds until we can find the packet lifetimes */
 552                 queue_delayed_work(agent->qp_info->port_priv->wq,
 553                                    &rmpp_recv->timeout_work,
 554                                    msecs_to_jiffies(40000));
 555                 rmpp_recv->newwin += window_size(agent);
 556                 ack_recv(rmpp_recv, mad_recv_wc);
 557                 mad_recv_wc = NULL;
 558         }
 559         deref_rmpp_recv(rmpp_recv);
 560         return mad_recv_wc;
 561 }
 562
 563 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 564 {
 565         struct ib_rmpp_mad *rmpp_mad;
 566         int timeout;
 567         u32 paylen = 0;
 568
 569         rmpp_mad = mad_send_wr->send_buf.mad;
 570         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 571         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
 572
 573         if (mad_send_wr->seg_num == 1) {
 574                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 575                 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
 576                          mad_send_wr->pad;
 577         }
 578
 579         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
 580                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 581                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
 582         }
 583         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 584
 585         /* 2 seconds for an ACK until we can find the packet lifetime */
 586         timeout = mad_send_wr->send_buf.timeout_ms;
 587         if (!timeout || timeout > 2000)
 588                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 589
 590         return ib_send_mad(mad_send_wr);
 591 }
 592
 593 static void abort_send(struct ib_mad_agent_private *agent,
 594                        struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
 595 {
 596         struct ib_mad_send_wr_private *mad_send_wr;
 597         struct ib_mad_send_wc wc;
 598         unsigned long flags;
 599
 600         spin_lock_irqsave(&agent->lock, flags);
 601         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 602         if (!mad_send_wr)
 603                 goto out;       /* Unmatched send */
 604
 605         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 606             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 607                 goto out;       /* Send is already done */
 608
 609         ib_mark_mad_done(mad_send_wr);
 610         spin_unlock_irqrestore(&agent->lock, flags);
 611
 612         wc.status = IB_WC_REM_ABORT_ERR;
 613         wc.vendor_err = rmpp_status;
 614         wc.send_buf = &mad_send_wr->send_buf;
 615         ib_mad_complete_send_wr(mad_send_wr, &wc);
 616         return;
 617 out:
 618         spin_unlock_irqrestore(&agent->lock, flags);
 619 }
 620
 621 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
 622                                    int seg_num)
 623 {
 624         struct list_head *list;
 625
 626         wr->last_ack = seg_num;
 627         list = &wr->last_ack_seg->list;
 628         list_for_each_entry(wr->last_ack_seg, list, list)
 629                 if (wr->last_ack_seg->num == seg_num)
 630                         break;
 631 }
 632
 633 static void process_ds_ack(struct ib_mad_agent_private *agent,
 634                            struct ib_mad_recv_wc *mad_recv_wc, int newwin)
 635 {
 636         struct mad_rmpp_recv *rmpp_recv;
 637
 638         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 639         if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
 640                 rmpp_recv->repwin = newwin;
 641 }
 642
 643 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 644                              struct ib_mad_recv_wc *mad_recv_wc)
 645 {
 646         struct ib_mad_send_wr_private *mad_send_wr;
 647         struct ib_rmpp_mad *rmpp_mad;
 648         unsigned long flags;
 649         int seg_num, newwin, ret;
 650
 651         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 652         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 653                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 654                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 655                 return;
 656         }
 657
 658         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 659         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 660         if (newwin < seg_num) {
 661                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 662                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 663                 return;
 664         }
 665
 666         spin_lock_irqsave(&agent->lock, flags);
 667         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 668         if (!mad_send_wr) {
 669                 if (!seg_num)
 670                         process_ds_ack(agent, mad_recv_wc, newwin);
 671                 goto out;       /* Unmatched or DS RMPP ACK */
 672         }
 673
 674         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
 675             (mad_send_wr->timeout)) {
 676                 spin_unlock_irqrestore(&agent->lock, flags);
 677                 ack_ds_ack(agent, mad_recv_wc);
 678                 return;         /* Repeated ACK for DS RMPP transaction */
 679         }
 680
 681         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 682             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 683                 goto out;       /* Send is already done */
 684
 685         if (seg_num > mad_send_wr->send_buf.seg_count ||
 686             seg_num > mad_send_wr->newwin) {
 687                 spin_unlock_irqrestore(&agent->lock, flags);
 688                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 689                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 690                 return;
 691         }
 692
 693         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 694                 goto out;       /* Old ACK */
 695
 696         if (seg_num > mad_send_wr->last_ack) {
 697                 adjust_last_ack(mad_send_wr, seg_num);
 698                 mad_send_wr->retries_left = mad_send_wr->max_retries;
 699         }
 700         mad_send_wr->newwin = newwin;
 701         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 702                 /* If no response is expected, the ACK completes the send */
 703                 if (!mad_send_wr->send_buf.timeout_ms) {
 704                         struct ib_mad_send_wc wc;
 705
 706                         ib_mark_mad_done(mad_send_wr);
 707                         spin_unlock_irqrestore(&agent->lock, flags);
 708
 709                         wc.status = IB_WC_SUCCESS;
 710                         wc.vendor_err = 0;
 711                         wc.send_buf = &mad_send_wr->send_buf;
 712                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 713                         return;
 714                 }
 715                 if (mad_send_wr->refcount == 1)
 716                         ib_reset_mad_timeout(mad_send_wr,
 717                                              mad_send_wr->send_buf.timeout_ms);
 718                 spin_unlock_irqrestore(&agent->lock, flags);
 719                 ack_ds_ack(agent, mad_recv_wc);
 720                 return;
 721         } else if (mad_send_wr->refcount == 1 &&
 722                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 723                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
 724                 /* Send failure will just result in a timeout/retry */
 725                 ret = send_next_seg(mad_send_wr);
 726                 if (ret)
 727                         goto out;
 728
 729                 mad_send_wr->refcount++;
 730                 list_move_tail(&mad_send_wr->agent_list,
 731                               &mad_send_wr->mad_agent_priv->send_list);
 732         }
 733 out:
 734         spin_unlock_irqrestore(&agent->lock, flags);
 735 }
 736
 737 static struct ib_mad_recv_wc *
 738 process_rmpp_data(struct ib_mad_agent_private *agent,
 739                   struct ib_mad_recv_wc *mad_recv_wc)
 740 {
 741         struct ib_rmpp_hdr *rmpp_hdr;
 742         u8 rmpp_status;
 743
 744         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 745
 746         if (rmpp_hdr->rmpp_status) {
 747                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 748                 goto bad;
 749         }
 750
 751         if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
 752                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 753                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 754                         goto bad;
 755                 }
 756                 return start_rmpp(agent, mad_recv_wc);
 757         } else {
 758                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 759                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 760                         goto bad;
 761                 }
 762                 return continue_rmpp(agent, mad_recv_wc);
 763         }
 764 bad:
 765         nack_recv(agent, mad_recv_wc, rmpp_status);
 766         ib_free_recv_mad(mad_recv_wc);
 767         return NULL;
 768 }
 769
 770 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 771                               struct ib_mad_recv_wc *mad_recv_wc)
 772 {
 773         struct ib_rmpp_mad *rmpp_mad;
 774
 775         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 776
 777         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 778                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 779                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 780         } else
 781                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 782 }
 783
 784 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 785                                struct ib_mad_recv_wc *mad_recv_wc)
 786 {
 787         struct ib_rmpp_mad *rmpp_mad;
 788
 789         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 790
 791         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 792             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 793                 abort_send(agent, mad_recv_wc, 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, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 797 }
 798
 799 struct ib_mad_recv_wc *
 800 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 801                         struct ib_mad_recv_wc *mad_recv_wc)
 802 {
 803         struct ib_rmpp_mad *rmpp_mad;
 804
 805         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 806         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 807                 return mad_recv_wc;
 808
 809         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 810                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 811                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 812                 goto out;
 813         }
 814
 815         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 816         case IB_MGMT_RMPP_TYPE_DATA:
 817                 return process_rmpp_data(agent, mad_recv_wc);
 818         case IB_MGMT_RMPP_TYPE_ACK:
 819                 process_rmpp_ack(agent, mad_recv_wc);
 820                 break;
 821         case IB_MGMT_RMPP_TYPE_STOP:
 822                 process_rmpp_stop(agent, mad_recv_wc);
 823                 break;
 824         case IB_MGMT_RMPP_TYPE_ABORT:
 825                 process_rmpp_abort(agent, mad_recv_wc);
 826                 break;
 827         default:
 828                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 829                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 830                 break;
 831         }
 832 out:
 833         ib_free_recv_mad(mad_recv_wc);
 834         return NULL;
 835 }
 836
 837 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
 838 {
 839         struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
 840         struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
 841         struct mad_rmpp_recv *rmpp_recv;
 842         struct ib_ah_attr ah_attr;
 843         unsigned long flags;
 844         int newwin = 1;
 845
 846         if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
 847                 goto out;
 848
 849         spin_lock_irqsave(&agent->lock, flags);
 850         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 851                 if (rmpp_recv->tid != mad_hdr->tid ||
 852                     rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
 853                     rmpp_recv->class_version != mad_hdr->class_version ||
 854                     (rmpp_recv->method & IB_MGMT_METHOD_RESP))
 855                         continue;
 856
 857                 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
 858                         continue;
 859
 860                 if (rmpp_recv->slid == ah_attr.dlid) {
 861                         newwin = rmpp_recv->repwin;
 862                         break;
 863                 }
 864         }
 865         spin_unlock_irqrestore(&agent->lock, flags);
 866 out:
 867         return newwin;
 868 }
 869
 870 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 871 {
 872         struct ib_rmpp_mad *rmpp_mad;
 873         int ret;
 874
 875         rmpp_mad = mad_send_wr->send_buf.mad;
 876         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 877               IB_MGMT_RMPP_FLAG_ACTIVE))
 878                 return IB_RMPP_RESULT_UNHANDLED;
 879
 880         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 881                 mad_send_wr->seg_num = 1;
 882                 return IB_RMPP_RESULT_INTERNAL;
 883         }
 884
 885         mad_send_wr->newwin = init_newwin(mad_send_wr);
 886
 887         /* We need to wait for the final ACK even if there isn't a response */
 888         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 889         ret = send_next_seg(mad_send_wr);
 890         if (!ret)
 891                 return IB_RMPP_RESULT_CONSUMED;
 892         return ret;
 893 }
 894
 895 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 896                             struct ib_mad_send_wc *mad_send_wc)
 897 {
 898         struct ib_rmpp_mad *rmpp_mad;
 899         int ret;
 900
 901         rmpp_mad = mad_send_wr->send_buf.mad;
 902         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 903               IB_MGMT_RMPP_FLAG_ACTIVE))
 904                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 905
 906         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 907                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 908
 909         if (mad_send_wc->status != IB_WC_SUCCESS ||
 910             mad_send_wr->status != IB_WC_SUCCESS)
 911                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 912
 913         if (!mad_send_wr->timeout)
 914                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 915
 916         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 917                 mad_send_wr->timeout =
 918                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 919                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 920         }
 921
 922         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
 923             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
 924                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 925
 926         ret = send_next_seg(mad_send_wr);
 927         if (ret) {
 928                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 929                 return IB_RMPP_RESULT_PROCESSED;
 930         }
 931         return IB_RMPP_RESULT_CONSUMED;
 932 }
 933
 934 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 935 {
 936         struct ib_rmpp_mad *rmpp_mad;
 937         int ret;
 938
 939         rmpp_mad = mad_send_wr->send_buf.mad;
 940         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 941               IB_MGMT_RMPP_FLAG_ACTIVE))
 942                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 943
 944         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
 945                 return IB_RMPP_RESULT_PROCESSED;
 946
 947         mad_send_wr->seg_num = mad_send_wr->last_ack;
 948         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
 949
 950         ret = send_next_seg(mad_send_wr);
 951         if (ret)
 952                 return IB_RMPP_RESULT_PROCESSED;
 953
 954         return IB_RMPP_RESULT_CONSUMED;
 955 }