LXR linux/drivers/infiniband/core/mad

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