drivers/infiniband/core/mad_rmpp.c

   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 IB_MGMT_SA_HDR;
 107         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 108                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 109                 return IB_MGMT_VENDOR_HDR;
 110         else
 111                 return IB_MGMT_RMPP_HDR;
 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         int ret;
 139
 140         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 141                                  recv_wc->wc->pkey_index, 1, IB_MGMT_RMPP_HDR,
 142                                  IB_MGMT_RMPP_DATA, GFP_KERNEL);
 143         if (!msg)
 144                 return;
 145
 146         format_ack(msg->mad, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad,
 147                    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
 160         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
 161                                   recv_wc->recv_buf.grh, agent->port_num);
 162         if (IS_ERR(ah))
 163                 return (void *) ah;
 164
 165         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
 166                                  recv_wc->wc->pkey_index, 1,
 167                                  IB_MGMT_RMPP_HDR, IB_MGMT_RMPP_DATA,
 168                                  GFP_KERNEL);
 169         if (IS_ERR(msg))
 170                 ib_destroy_ah(ah);
 171         else
 172                 msg->ah = ah;
 173
 174         return msg;
 175 }
 176
 177 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 178 {
 179         struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
 180
 181         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
 182                 ib_destroy_ah(mad_send_wc->send_buf->ah);
 183         ib_free_send_mad(mad_send_wc->send_buf);
 184 }
 185
 186 static void nack_recv(struct ib_mad_agent_private *agent,
 187                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
 188 {
 189         struct ib_mad_send_buf *msg;
 190         struct ib_rmpp_mad *rmpp_mad;
 191         int ret;
 192
 193         msg = alloc_response_msg(&agent->agent, recv_wc);
 194         if (IS_ERR(msg))
 195                 return;
 196
 197         rmpp_mad = msg->mad;
 198         memcpy(rmpp_mad, recv_wc->recv_buf.mad,
 199                data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class));
 200
 201         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 202         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
 203         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
 204         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 205         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
 206         rmpp_mad->rmpp_hdr.seg_num = 0;
 207         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 208
 209         ret = ib_post_send_mad(msg, NULL);
 210         if (ret) {
 211                 ib_destroy_ah(msg->ah);
 212                 ib_free_send_mad(msg);
 213         }
 214 }
 215
 216 static void recv_timeout_handler(void *data)
 217 {
 218         struct mad_rmpp_recv *rmpp_recv = data;
 219         struct ib_mad_recv_wc *rmpp_wc;
 220         unsigned long flags;
 221
 222         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 223         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 224                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 225                 return;
 226         }
 227         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 228         list_del(&rmpp_recv->list);
 229         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 230
 231         rmpp_wc = rmpp_recv->rmpp_wc;
 232         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 233         destroy_rmpp_recv(rmpp_recv);
 234         ib_free_recv_mad(rmpp_wc);
 235 }
 236
 237 static void recv_cleanup_handler(void *data)
 238 {
 239         struct mad_rmpp_recv *rmpp_recv = data;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 243         list_del(&rmpp_recv->list);
 244         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 245         destroy_rmpp_recv(rmpp_recv);
 246 }
 247
 248 static struct mad_rmpp_recv *
 249 create_rmpp_recv(struct ib_mad_agent_private *agent,
 250                  struct ib_mad_recv_wc *mad_recv_wc)
 251 {
 252         struct mad_rmpp_recv *rmpp_recv;
 253         struct ib_mad_hdr *mad_hdr;
 254
 255         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 256         if (!rmpp_recv)
 257                 return NULL;
 258
 259         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 260                                              mad_recv_wc->wc,
 261                                              mad_recv_wc->recv_buf.grh,
 262                                              agent->agent.port_num);
 263         if (IS_ERR(rmpp_recv->ah))
 264                 goto error;
 265
 266         rmpp_recv->agent = agent;
 267         init_waitqueue_head(&rmpp_recv->wait);
 268         INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv);
 269         INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv);
 270         spin_lock_init(&rmpp_recv->lock);
 271         rmpp_recv->state = RMPP_STATE_ACTIVE;
 272         atomic_set(&rmpp_recv->refcount, 1);
 273
 274         rmpp_recv->rmpp_wc = mad_recv_wc;
 275         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 276         rmpp_recv->newwin = 1;
 277         rmpp_recv->seg_num = 1;
 278         rmpp_recv->last_ack = 0;
 279
 280         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 281         rmpp_recv->tid = mad_hdr->tid;
 282         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 283         rmpp_recv->slid = mad_recv_wc->wc->slid;
 284         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 285         rmpp_recv->class_version = mad_hdr->class_version;
 286         rmpp_recv->method  = mad_hdr->method;
 287         return rmpp_recv;
 288
 289 error:  kfree(rmpp_recv);
 290         return NULL;
 291 }
 292
 293 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 294 {
 295         if (atomic_dec_and_test(&rmpp_recv->refcount))
 296                 wake_up(&rmpp_recv->wait);
 297 }
 298
 299 static struct mad_rmpp_recv *
 300 find_rmpp_recv(struct ib_mad_agent_private *agent,
 301                struct ib_mad_recv_wc *mad_recv_wc)
 302 {
 303         struct mad_rmpp_recv *rmpp_recv;
 304         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 305
 306         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 307                 if (rmpp_recv->tid == mad_hdr->tid &&
 308                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 309                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 310                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 311                     rmpp_recv->class_version == mad_hdr->class_version &&
 312                     rmpp_recv->method == mad_hdr->method)
 313                         return rmpp_recv;
 314         }
 315         return NULL;
 316 }
 317
 318 static struct mad_rmpp_recv *
 319 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 320                   struct ib_mad_recv_wc *mad_recv_wc)
 321 {
 322         struct mad_rmpp_recv *rmpp_recv;
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&agent->lock, flags);
 326         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 327         if (rmpp_recv)
 328                 atomic_inc(&rmpp_recv->refcount);
 329         spin_unlock_irqrestore(&agent->lock, flags);
 330         return rmpp_recv;
 331 }
 332
 333 static struct mad_rmpp_recv *
 334 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 335                  struct mad_rmpp_recv *rmpp_recv)
 336 {
 337         struct mad_rmpp_recv *cur_rmpp_recv;
 338
 339         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 340         if (!cur_rmpp_recv)
 341                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 342
 343         return cur_rmpp_recv;
 344 }
 345
 346 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 347 {
 348         struct ib_rmpp_mad *rmpp_mad;
 349
 350         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 351         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 352 }
 353
 354 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 355 {
 356         struct ib_rmpp_mad *rmpp_mad;
 357
 358         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 359         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 360 }
 361
 362 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 363                                                     struct ib_mad_recv_buf *seg)
 364 {
 365         if (seg->list.next == rmpp_list)
 366                 return NULL;
 367
 368         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 369 }
 370
 371 static inline int window_size(struct ib_mad_agent_private *agent)
 372 {
 373         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 374 }
 375
 376 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 377                                                   int seg_num)
 378 {
 379         struct ib_mad_recv_buf *seg_buf;
 380         int cur_seg_num;
 381
 382         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 383                 cur_seg_num = get_seg_num(seg_buf);
 384                 if (seg_num > cur_seg_num)
 385                         return seg_buf;
 386                 if (seg_num == cur_seg_num)
 387                         break;
 388         }
 389         return NULL;
 390 }
 391
 392 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 393                            struct ib_mad_recv_buf *new_buf)
 394 {
 395         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 396
 397         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 398                 rmpp_recv->cur_seg_buf = new_buf;
 399                 rmpp_recv->seg_num++;
 400                 new_buf = get_next_seg(rmpp_list, new_buf);
 401         }
 402 }
 403
 404 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 405 {
 406         struct ib_rmpp_mad *rmpp_mad;
 407         int hdr_size, data_size, pad;
 408
 409         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 410
 411         hdr_size = data_offset(rmpp_mad->mad_hdr.mgmt_class);
 412         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 413         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 414         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 415                 pad = 0;
 416
 417         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 418 }
 419
 420 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 421 {
 422         struct ib_mad_recv_wc *rmpp_wc;
 423
 424         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 425         if (rmpp_recv->seg_num > 1)
 426                 cancel_delayed_work(&rmpp_recv->timeout_work);
 427
 428         rmpp_wc = rmpp_recv->rmpp_wc;
 429         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 430         /* 10 seconds until we can find the packet lifetime */
 431         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 432                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 433         return rmpp_wc;
 434 }
 435
 436 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf)
 437 {
 438         struct ib_mad_recv_buf *seg_buf;
 439         struct ib_rmpp_mad *rmpp_mad;
 440         void *data;
 441         int size, len, offset;
 442         u8 flags;
 443
 444         len = mad_recv_wc->mad_len;
 445         if (len <= sizeof(struct ib_mad)) {
 446                 memcpy(buf, mad_recv_wc->recv_buf.mad, len);
 447                 return;
 448         }
 449
 450         offset = data_offset(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 451
 452         list_for_each_entry(seg_buf, &mad_recv_wc->rmpp_list, list) {
 453                 rmpp_mad = (struct ib_rmpp_mad *)seg_buf->mad;
 454                 flags = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr);
 455
 456                 if (flags & IB_MGMT_RMPP_FLAG_FIRST) {
 457                         data = rmpp_mad;
 458                         size = sizeof(*rmpp_mad);
 459                 } else {
 460                         data = (void *) rmpp_mad + offset;
 461                         if (flags & IB_MGMT_RMPP_FLAG_LAST)
 462                                 size = len;
 463                         else
 464                                 size = sizeof(*rmpp_mad) - offset;
 465                 }
 466
 467                 memcpy(buf, data, size);
 468                 len -= size;
 469                 buf += size;
 470         }
 471 }
 472 EXPORT_SYMBOL(ib_coalesce_recv_mad);
 473
 474 static struct ib_mad_recv_wc *
 475 continue_rmpp(struct ib_mad_agent_private *agent,
 476               struct ib_mad_recv_wc *mad_recv_wc)
 477 {
 478         struct mad_rmpp_recv *rmpp_recv;
 479         struct ib_mad_recv_buf *prev_buf;
 480         struct ib_mad_recv_wc *done_wc;
 481         int seg_num;
 482         unsigned long flags;
 483
 484         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 485         if (!rmpp_recv)
 486                 goto drop1;
 487
 488         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 489
 490         spin_lock_irqsave(&rmpp_recv->lock, flags);
 491         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 492             (seg_num > rmpp_recv->newwin))
 493                 goto drop3;
 494
 495         if ((seg_num <= rmpp_recv->last_ack) ||
 496             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 497                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 498                 ack_recv(rmpp_recv, mad_recv_wc);
 499                 goto drop2;
 500         }
 501
 502         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 503         if (!prev_buf)
 504                 goto drop3;
 505
 506         done_wc = NULL;
 507         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 508         if (rmpp_recv->cur_seg_buf == prev_buf) {
 509                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 510                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 511                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 512                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 513                         done_wc = complete_rmpp(rmpp_recv);
 514                         goto out;
 515                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 516                         rmpp_recv->newwin += window_size(agent);
 517                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 518                         ack_recv(rmpp_recv, mad_recv_wc);
 519                         goto out;
 520                 }
 521         }
 522         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 523 out:
 524         deref_rmpp_recv(rmpp_recv);
 525         return done_wc;
 526
 527 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 528 drop2:  deref_rmpp_recv(rmpp_recv);
 529 drop1:  ib_free_recv_mad(mad_recv_wc);
 530         return NULL;
 531 }
 532
 533 static struct ib_mad_recv_wc *
 534 start_rmpp(struct ib_mad_agent_private *agent,
 535            struct ib_mad_recv_wc *mad_recv_wc)
 536 {
 537         struct mad_rmpp_recv *rmpp_recv;
 538         unsigned long flags;
 539
 540         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 541         if (!rmpp_recv) {
 542                 ib_free_recv_mad(mad_recv_wc);
 543                 return NULL;
 544         }
 545
 546         spin_lock_irqsave(&agent->lock, flags);
 547         if (insert_rmpp_recv(agent, rmpp_recv)) {
 548                 spin_unlock_irqrestore(&agent->lock, flags);
 549                 /* duplicate first MAD */
 550                 destroy_rmpp_recv(rmpp_recv);
 551                 return continue_rmpp(agent, mad_recv_wc);
 552         }
 553         atomic_inc(&rmpp_recv->refcount);
 554
 555         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 556                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 557                 spin_unlock_irqrestore(&agent->lock, flags);
 558                 complete_rmpp(rmpp_recv);
 559         } else {
 560                 spin_unlock_irqrestore(&agent->lock, flags);
 561                 /* 40 seconds until we can find the packet lifetimes */
 562                 queue_delayed_work(agent->qp_info->port_priv->wq,
 563                                    &rmpp_recv->timeout_work,
 564                                    msecs_to_jiffies(40000));
 565                 rmpp_recv->newwin += window_size(agent);
 566                 ack_recv(rmpp_recv, mad_recv_wc);
 567                 mad_recv_wc = NULL;
 568         }
 569         deref_rmpp_recv(rmpp_recv);
 570         return mad_recv_wc;
 571 }
 572
 573 static inline u64 get_seg_addr(struct ib_mad_send_wr_private *mad_send_wr)
 574 {
 575         return mad_send_wr->sg_list[0].addr + mad_send_wr->data_offset +
 576                (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset) *
 577                (mad_send_wr->seg_num - 1);
 578 }
 579
 580 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 581 {
 582         struct ib_rmpp_mad *rmpp_mad;
 583         int timeout;
 584         u32 paylen;
 585
 586         rmpp_mad = mad_send_wr->send_buf.mad;
 587         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 588         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(mad_send_wr->seg_num);
 589
 590         if (mad_send_wr->seg_num == 1) {
 591                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 592                 paylen = mad_send_wr->total_seg * IB_MGMT_RMPP_DATA -
 593                          mad_send_wr->pad;
 594                 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 595                 mad_send_wr->sg_list[0].length = sizeof(struct ib_rmpp_mad);
 596         } else {
 597                 mad_send_wr->send_wr.num_sge = 2;
 598                 mad_send_wr->sg_list[0].length = mad_send_wr->data_offset;
 599                 mad_send_wr->sg_list[1].addr = get_seg_addr(mad_send_wr);
 600                 mad_send_wr->sg_list[1].length = sizeof(struct ib_rmpp_mad) -
 601                                                  mad_send_wr->data_offset;
 602                 mad_send_wr->sg_list[1].lkey = mad_send_wr->sg_list[0].lkey;
 603                 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 604         }
 605
 606         if (mad_send_wr->seg_num == mad_send_wr->total_seg) {
 607                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 608                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
 609                 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 610         }
 611
 612         /* 2 seconds for an ACK until we can find the packet lifetime */
 613         timeout = mad_send_wr->send_buf.timeout_ms;
 614         if (!timeout || timeout > 2000)
 615                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 616         mad_send_wr->seg_num++;
 617         return ib_send_mad(mad_send_wr);
 618 }
 619
 620 static void abort_send(struct ib_mad_agent_private *agent, __be64 tid,
 621                        u8 rmpp_status)
 622 {
 623         struct ib_mad_send_wr_private *mad_send_wr;
 624         struct ib_mad_send_wc wc;
 625         unsigned long flags;
 626
 627         spin_lock_irqsave(&agent->lock, flags);
 628         mad_send_wr = ib_find_send_mad(agent, tid);
 629         if (!mad_send_wr)
 630                 goto out;       /* Unmatched send */
 631
 632         if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
 633             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 634                 goto out;       /* Send is already done */
 635
 636         ib_mark_mad_done(mad_send_wr);
 637         spin_unlock_irqrestore(&agent->lock, flags);
 638
 639         wc.status = IB_WC_REM_ABORT_ERR;
 640         wc.vendor_err = rmpp_status;
 641         wc.send_buf = &mad_send_wr->send_buf;
 642         ib_mad_complete_send_wr(mad_send_wr, &wc);
 643         return;
 644 out:
 645         spin_unlock_irqrestore(&agent->lock, flags);
 646 }
 647
 648 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 649                              struct ib_mad_recv_wc *mad_recv_wc)
 650 {
 651         struct ib_mad_send_wr_private *mad_send_wr;
 652         struct ib_rmpp_mad *rmpp_mad;
 653         unsigned long flags;
 654         int seg_num, newwin, ret;
 655
 656         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 657         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 658                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 659                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 660                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 661                 return;
 662         }
 663
 664         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 665         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 666         if (newwin < seg_num) {
 667                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 668                            IB_MGMT_RMPP_STATUS_W2S);
 669                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 670                 return;
 671         }
 672
 673         spin_lock_irqsave(&agent->lock, flags);
 674         mad_send_wr = ib_find_send_mad(agent, rmpp_mad->mad_hdr.tid);
 675         if (!mad_send_wr)
 676                 goto out;       /* Unmatched ACK */
 677
 678         if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
 679             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 680                 goto out;       /* Send is already done */
 681
 682         if (seg_num > mad_send_wr->total_seg || seg_num > mad_send_wr->newwin) {
 683                 spin_unlock_irqrestore(&agent->lock, flags);
 684                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 685                            IB_MGMT_RMPP_STATUS_S2B);
 686                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 687                 return;
 688         }
 689
 690         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 691                 goto out;       /* Old ACK */
 692
 693         if (seg_num > mad_send_wr->last_ack) {
 694                 mad_send_wr->last_ack = seg_num;
 695                 mad_send_wr->retries = mad_send_wr->send_buf.retries;
 696         }
 697         mad_send_wr->newwin = newwin;
 698         if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
 699                 /* If no response is expected, the ACK completes the send */
 700                 if (!mad_send_wr->send_buf.timeout_ms) {
 701                         struct ib_mad_send_wc wc;
 702
 703                         ib_mark_mad_done(mad_send_wr);
 704                         spin_unlock_irqrestore(&agent->lock, flags);
 705
 706                         wc.status = IB_WC_SUCCESS;
 707                         wc.vendor_err = 0;
 708                         wc.send_buf = &mad_send_wr->send_buf;
 709                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 710                         return;
 711                 }
 712                 if (mad_send_wr->refcount == 1)
 713                         ib_reset_mad_timeout(mad_send_wr,
 714                                              mad_send_wr->send_buf.timeout_ms);
 715         } else if (mad_send_wr->refcount == 1 &&
 716                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 717                    mad_send_wr->seg_num <= mad_send_wr->total_seg) {
 718                 /* Send failure will just result in a timeout/retry */
 719                 ret = send_next_seg(mad_send_wr);
 720                 if (ret)
 721                         goto out;
 722
 723                 mad_send_wr->refcount++;
 724                 list_del(&mad_send_wr->agent_list);
 725                 list_add_tail(&mad_send_wr->agent_list,
 726                               &mad_send_wr->mad_agent_priv->send_list);
 727         }
 728 out:
 729         spin_unlock_irqrestore(&agent->lock, flags);
 730 }
 731
 732 static struct ib_mad_recv_wc *
 733 process_rmpp_data(struct ib_mad_agent_private *agent,
 734                   struct ib_mad_recv_wc *mad_recv_wc)
 735 {
 736         struct ib_rmpp_hdr *rmpp_hdr;
 737         u8 rmpp_status;
 738
 739         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 740
 741         if (rmpp_hdr->rmpp_status) {
 742                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 743                 goto bad;
 744         }
 745
 746         if (rmpp_hdr->seg_num == __constant_htonl(1)) {
 747                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 748                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 749                         goto bad;
 750                 }
 751                 return start_rmpp(agent, mad_recv_wc);
 752         } else {
 753                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 754                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 755                         goto bad;
 756                 }
 757                 return continue_rmpp(agent, mad_recv_wc);
 758         }
 759 bad:
 760         nack_recv(agent, mad_recv_wc, rmpp_status);
 761         ib_free_recv_mad(mad_recv_wc);
 762         return NULL;
 763 }
 764
 765 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 766                               struct ib_mad_recv_wc *mad_recv_wc)
 767 {
 768         struct ib_rmpp_mad *rmpp_mad;
 769
 770         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 771
 772         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 773                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 774                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 775                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 776         } else
 777                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 778                            rmpp_mad->rmpp_hdr.rmpp_status);
 779 }
 780
 781 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 782                                struct ib_mad_recv_wc *mad_recv_wc)
 783 {
 784         struct ib_rmpp_mad *rmpp_mad;
 785
 786         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 787
 788         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 789             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 790                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 791                            IB_MGMT_RMPP_STATUS_BAD_STATUS);
 792                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 793         } else
 794                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 795                            rmpp_mad->rmpp_hdr.rmpp_status);
 796 }
 797
 798 struct ib_mad_recv_wc *
 799 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 800                         struct ib_mad_recv_wc *mad_recv_wc)
 801 {
 802         struct ib_rmpp_mad *rmpp_mad;
 803
 804         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 805         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 806                 return mad_recv_wc;
 807
 808         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 809                 abort_send(agent, rmpp_mad->mad_hdr.tid,
 810                            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, rmpp_mad->mad_hdr.tid,
 829                            IB_MGMT_RMPP_STATUS_BADT);
 830                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 831                 break;
 832         }
 833 out:
 834         ib_free_recv_mad(mad_recv_wc);
 835         return NULL;
 836 }
 837
 838 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 839 {
 840         struct ib_rmpp_mad *rmpp_mad;
 841         int i, total_len, ret;
 842
 843         rmpp_mad = mad_send_wr->send_buf.mad;
 844         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 845               IB_MGMT_RMPP_FLAG_ACTIVE))
 846                 return IB_RMPP_RESULT_UNHANDLED;
 847
 848         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 849                 return IB_RMPP_RESULT_INTERNAL;
 850
 851         if (mad_send_wr->send_wr.num_sge > 1)
 852                 return -EINVAL;         /* TODO: support num_sge > 1 */
 853
 854         mad_send_wr->seg_num = 1;
 855         mad_send_wr->newwin = 1;
 856         mad_send_wr->data_offset = data_offset(rmpp_mad->mad_hdr.mgmt_class);
 857
 858         total_len = 0;
 859         for (i = 0; i < mad_send_wr->send_wr.num_sge; i++)
 860                 total_len += mad_send_wr->send_wr.sg_list[i].length;
 861
 862         mad_send_wr->total_seg = (total_len - mad_send_wr->data_offset) /
 863                         (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset);
 864         mad_send_wr->pad = total_len - IB_MGMT_RMPP_HDR -
 865                            be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 866
 867         /* We need to wait for the final ACK even if there isn't a response */
 868         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 869         ret = send_next_seg(mad_send_wr);
 870         if (!ret)
 871                 return IB_RMPP_RESULT_CONSUMED;
 872         return ret;
 873 }
 874
 875 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 876                             struct ib_mad_send_wc *mad_send_wc)
 877 {
 878         struct ib_rmpp_mad *rmpp_mad;
 879         int ret;
 880
 881         rmpp_mad = mad_send_wr->send_buf.mad;
 882         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 883               IB_MGMT_RMPP_FLAG_ACTIVE))
 884                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 885
 886         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 887                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 888
 889         if (mad_send_wc->status != IB_WC_SUCCESS ||
 890             mad_send_wr->status != IB_WC_SUCCESS)
 891                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 892
 893         if (!mad_send_wr->timeout)
 894                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 895
 896         if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
 897                 mad_send_wr->timeout =
 898                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 899                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 900         }
 901
 902         if (mad_send_wr->seg_num > mad_send_wr->newwin ||
 903             mad_send_wr->seg_num > mad_send_wr->total_seg)
 904                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 905
 906         ret = send_next_seg(mad_send_wr);
 907         if (ret) {
 908                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 909                 return IB_RMPP_RESULT_PROCESSED;
 910         }
 911         return IB_RMPP_RESULT_CONSUMED;
 912 }
 913
 914 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 915 {
 916         struct ib_rmpp_mad *rmpp_mad;
 917         int ret;
 918
 919         rmpp_mad = mad_send_wr->send_buf.mad;
 920         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 921               IB_MGMT_RMPP_FLAG_ACTIVE))
 922                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 923
 924         if (mad_send_wr->last_ack == mad_send_wr->total_seg)
 925                 return IB_RMPP_RESULT_PROCESSED;
 926
 927         mad_send_wr->seg_num = mad_send_wr->last_ack + 1;
 928         ret = send_next_seg(mad_send_wr);
 929         if (ret)
 930                 return IB_RMPP_RESULT_PROCESSED;
 931
 932         return IB_RMPP_RESULT_CONSUMED;
 933 }