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