lnet/klnds/ptllnd/ptllnd_rx_buf.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/klnds/ptllnd/ptllnd_rx_buf.c
  37  *
  38  * Author: PJ Kirner <pjkirner@clusterfs.com>
  39  */
  40
  41  #include "ptllnd.h"
  42
  43 void
  44 kptllnd_rx_buffer_pool_init(kptl_rx_buffer_pool_t *rxbp)
  45 {
  46         memset(rxbp, 0, sizeof(*rxbp));
  47         spin_lock_init(&rxbp->rxbp_lock);
  48         CFS_INIT_LIST_HEAD(&rxbp->rxbp_list);
  49 }
  50
  51 void
  52 kptllnd_rx_buffer_destroy(kptl_rx_buffer_t *rxb)
  53 {
  54         kptl_rx_buffer_pool_t *rxbp = rxb->rxb_pool;
  55
  56         LASSERT(rxb->rxb_refcount == 0);
  57         LASSERT(PtlHandleIsEqual(rxb->rxb_mdh, PTL_INVALID_HANDLE));
  58         LASSERT(!rxb->rxb_posted);
  59         LASSERT(rxb->rxb_idle);
  60
  61         cfs_list_del(&rxb->rxb_list);
  62         rxbp->rxbp_count--;
  63
  64         LIBCFS_FREE(rxb->rxb_buffer, kptllnd_rx_buffer_size());
  65         LIBCFS_FREE(rxb, sizeof(*rxb));
  66 }
  67
  68 int
  69 kptllnd_rx_buffer_pool_reserve(kptl_rx_buffer_pool_t *rxbp, int count)
  70 {
  71         int               bufsize;
  72         int               msgs_per_buffer;
  73         int               rc;
  74         kptl_rx_buffer_t *rxb;
  75         char             *buffer;
  76         unsigned long     flags;
  77
  78         bufsize = kptllnd_rx_buffer_size();
  79         msgs_per_buffer = bufsize / (*kptllnd_tunables.kptl_max_msg_size);
  80
  81         CDEBUG(D_NET, "kptllnd_rx_buffer_pool_reserve(%d)\n", count);
  82
  83         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
  84
  85         for (;;) {
  86                 if (rxbp->rxbp_shutdown) {
  87                         rc = -ESHUTDOWN;
  88                         break;
  89                 }
  90
  91                 if (rxbp->rxbp_reserved + count <=
  92                     rxbp->rxbp_count * msgs_per_buffer) {
  93                         rc = 0;
  94                         break;
  95                 }
  96
  97                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
  98
  99                 LIBCFS_ALLOC(rxb, sizeof(*rxb));
 100                 LIBCFS_ALLOC(buffer, bufsize);
 101
 102                 if (rxb == NULL || buffer == NULL) {
 103                         CERROR("Failed to allocate rx buffer\n");
 104
 105                         if (rxb != NULL)
 106                                 LIBCFS_FREE(rxb, sizeof(*rxb));
 107                         if (buffer != NULL)
 108                                 LIBCFS_FREE(buffer, bufsize);
 109
 110                         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 111                         rc = -ENOMEM;
 112                         break;
 113                 }
 114
 115                 memset(rxb, 0, sizeof(*rxb));
 116
 117                 rxb->rxb_eventarg.eva_type = PTLLND_EVENTARG_TYPE_BUF;
 118                 rxb->rxb_refcount = 0;
 119                 rxb->rxb_pool = rxbp;
 120                 rxb->rxb_idle = 0;
 121                 rxb->rxb_posted = 0;
 122                 rxb->rxb_buffer = buffer;
 123                 rxb->rxb_mdh = PTL_INVALID_HANDLE;
 124
 125                 spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 126
 127                 if (rxbp->rxbp_shutdown) {
 128                         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 129
 130                         LIBCFS_FREE(rxb, sizeof(*rxb));
 131                         LIBCFS_FREE(buffer, bufsize);
 132
 133                         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 134                         rc = -ESHUTDOWN;
 135                         break;
 136                 }
 137
 138                 cfs_list_add_tail(&rxb->rxb_list, &rxbp->rxbp_list);
 139                 rxbp->rxbp_count++;
 140
 141                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 142
 143                 kptllnd_rx_buffer_post(rxb);
 144
 145                 spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 146         }
 147
 148         if (rc == 0)
 149                 rxbp->rxbp_reserved += count;
 150
 151         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 152
 153         return rc;
 154 }
 155
 156 void
 157 kptllnd_rx_buffer_pool_unreserve(kptl_rx_buffer_pool_t *rxbp,
 158                                  int count)
 159 {
 160         unsigned long flags;
 161
 162         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 163
 164         CDEBUG(D_NET, "kptllnd_rx_buffer_pool_unreserve(%d)\n", count);
 165         rxbp->rxbp_reserved -= count;
 166
 167         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 168 }
 169
 170 void
 171 kptllnd_rx_buffer_pool_fini(kptl_rx_buffer_pool_t *rxbp)
 172 {
 173         kptl_rx_buffer_t       *rxb;
 174         int                     rc;
 175         int                     i;
 176         unsigned long           flags;
 177         cfs_list_t             *tmp;
 178         cfs_list_t             *nxt;
 179         ptl_handle_md_t         mdh;
 180
 181         /* CAVEAT EMPTOR: I'm racing with everything here!!!
 182          *
 183          * Buffers can still be posted after I set rxbp_shutdown because I
 184          * can't hold rxbp_lock while I'm posting them.
 185          *
 186          * Calling PtlMDUnlink() here races with auto-unlinks; i.e. a buffer's
 187          * MD handle could become invalid under me.  I am vulnerable to portals
 188          * re-using handles (i.e. make the same handle valid again, but for a
 189          * different MD) from when the MD is actually unlinked, to when the
 190          * event callback tells me it has been unlinked. */
 191
 192         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 193
 194         rxbp->rxbp_shutdown = 1;
 195
 196         for (i = 9;; i++) {
 197                 cfs_list_for_each_safe(tmp, nxt, &rxbp->rxbp_list) {
 198                         rxb = cfs_list_entry (tmp, kptl_rx_buffer_t, rxb_list);
 199
 200                         if (rxb->rxb_idle) {
 201                                 spin_unlock_irqrestore(&rxbp->rxbp_lock,
 202                                                            flags);
 203                                 kptllnd_rx_buffer_destroy(rxb);
 204                                 spin_lock_irqsave(&rxbp->rxbp_lock,
 205                                                       flags);
 206                                 continue;
 207                         }
 208
 209                         mdh = rxb->rxb_mdh;
 210                         if (PtlHandleIsEqual(mdh, PTL_INVALID_HANDLE))
 211                                 continue;
 212
 213                         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 214
 215                         rc = PtlMDUnlink(mdh);
 216
 217                         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 218
 219 #ifdef LUSTRE_PORTALS_UNLINK_SEMANTICS
 220                         /* callback clears rxb_mdh and drops net's ref
 221                          * (which causes repost, but since I set
 222                          * shutdown, it will just set the buffer
 223                          * idle) */
 224 #else
 225                         if (rc == PTL_OK) {
 226                                 rxb->rxb_posted = 0;
 227                                 rxb->rxb_mdh = PTL_INVALID_HANDLE;
 228                                 kptllnd_rx_buffer_decref_locked(rxb);
 229                         }
 230 #endif
 231                 }
 232
 233                 if (cfs_list_empty(&rxbp->rxbp_list))
 234                         break;
 235
 236                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 237
 238                 /* Wait a bit for references to be dropped */
 239                 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* power of 2? */
 240                        "Waiting for %d Busy RX Buffers\n",
 241                        rxbp->rxbp_count);
 242
 243                 cfs_pause(cfs_time_seconds(1));
 244
 245                 spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 246         }
 247
 248         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 249 }
 250
 251 void
 252 kptllnd_rx_buffer_post(kptl_rx_buffer_t *rxb)
 253 {
 254         int                     rc;
 255         ptl_md_t                md;
 256         ptl_handle_me_t         meh;
 257         ptl_handle_md_t         mdh;
 258         ptl_process_id_t        any;
 259         kptl_rx_buffer_pool_t  *rxbp = rxb->rxb_pool;
 260         unsigned long           flags;
 261
 262         LASSERT (!cfs_in_interrupt());
 263         LASSERT (rxb->rxb_refcount == 0);
 264         LASSERT (!rxb->rxb_idle);
 265         LASSERT (!rxb->rxb_posted);
 266         LASSERT (PtlHandleIsEqual(rxb->rxb_mdh, PTL_INVALID_HANDLE));
 267
 268         any.nid = PTL_NID_ANY;
 269         any.pid = PTL_PID_ANY;
 270
 271         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 272
 273         if (rxbp->rxbp_shutdown) {
 274                 rxb->rxb_idle = 1;
 275                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 276                 return;
 277         }
 278
 279         rxb->rxb_refcount = 1;                  /* net's ref */
 280         rxb->rxb_posted = 1;                    /* I'm posting */
 281
 282         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 283
 284         rc = PtlMEAttach(kptllnd_data.kptl_nih,
 285                          *kptllnd_tunables.kptl_portal,
 286                          any,
 287                          LNET_MSG_MATCHBITS,
 288                          0, /* all matchbits are valid - ignore none */
 289                          PTL_UNLINK,
 290                          PTL_INS_AFTER,
 291                          &meh);
 292         if (rc != PTL_OK) {
 293                 CERROR("PtlMeAttach rxb failed %s(%d)\n",
 294                        kptllnd_errtype2str(rc), rc);
 295                 goto failed;
 296         }
 297
 298         /*
 299          * Setup MD
 300          */
 301         md.start = rxb->rxb_buffer;
 302         md.length = kptllnd_rx_buffer_size();
 303         md.threshold = PTL_MD_THRESH_INF;
 304         md.options = PTL_MD_OP_PUT |
 305                      PTL_MD_LUSTRE_COMPLETION_SEMANTICS |
 306                      PTL_MD_EVENT_START_DISABLE |
 307                      PTL_MD_MAX_SIZE |
 308                      PTL_MD_LOCAL_ALIGN8;
 309         md.user_ptr = &rxb->rxb_eventarg;
 310         md.max_size = *kptllnd_tunables.kptl_max_msg_size;
 311         md.eq_handle = kptllnd_data.kptl_eqh;
 312
 313         rc = PtlMDAttach(meh, md, PTL_UNLINK, &mdh);
 314         if (rc == PTL_OK) {
 315                 spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 316                 if (rxb->rxb_posted)            /* Not auto-unlinked yet!!! */
 317                         rxb->rxb_mdh = mdh;
 318                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 319                 return;
 320         }
 321
 322         CERROR("PtlMDAttach rxb failed %s(%d)\n",
 323                kptllnd_errtype2str(rc), rc);
 324         rc = PtlMEUnlink(meh);
 325         LASSERT(rc == PTL_OK);
 326
 327  failed:
 328         spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 329         rxb->rxb_posted = 0;
 330         /* XXX this will just try again immediately */
 331         kptllnd_rx_buffer_decref_locked(rxb);
 332         spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 333 }
 334
 335 kptl_rx_t *
 336 kptllnd_rx_alloc(void)
 337 {
 338         kptl_rx_t* rx;
 339
 340         if (IS_SIMULATION_ENABLED(FAIL_RX_ALLOC)) {
 341                 CERROR ("FAIL_RX_ALLOC SIMULATION triggered\n");
 342                 return NULL;
 343         }
 344
 345         rx = kmem_cache_alloc(kptllnd_data.kptl_rx_cache, GFP_ATOMIC);
 346         if (rx == NULL) {
 347                 CERROR("Failed to allocate rx\n");
 348                 return NULL;
 349         }
 350
 351         memset(rx, 0, sizeof(*rx));
 352         return rx;
 353 }
 354
 355 void
 356 kptllnd_rx_done(kptl_rx_t *rx, int post_credit)
 357 {
 358         kptl_rx_buffer_t *rxb = rx->rx_rxb;
 359         kptl_peer_t      *peer = rx->rx_peer;
 360         unsigned long     flags;
 361
 362         LASSERT (post_credit == PTLLND_POSTRX_NO_CREDIT ||
 363                  post_credit == PTLLND_POSTRX_PEER_CREDIT);
 364
 365         CDEBUG(D_NET, "rx=%p rxb %p peer %p\n", rx, rxb, peer);
 366
 367         if (rxb != NULL)
 368                 kptllnd_rx_buffer_decref(rxb);
 369
 370         if (peer != NULL) {
 371                 /* Update credits (after I've decref-ed the buffer) */
 372                 spin_lock_irqsave(&peer->peer_lock, flags);
 373
 374                 if (post_credit == PTLLND_POSTRX_PEER_CREDIT)
 375                         peer->peer_outstanding_credits++;
 376
 377                 LASSERT (peer->peer_outstanding_credits +
 378                          peer->peer_sent_credits <=
 379                          *kptllnd_tunables.kptl_peertxcredits);
 380
 381                 CDEBUG(D_NETTRACE, "%s[%d/%d+%d]: rx %p done\n",
 382                        libcfs_id2str(peer->peer_id), peer->peer_credits,
 383                        peer->peer_outstanding_credits, peer->peer_sent_credits,
 384                        rx);
 385
 386                 spin_unlock_irqrestore(&peer->peer_lock, flags);
 387
 388                 /* I might have to send back credits */
 389                 kptllnd_peer_check_sends(peer);
 390                 kptllnd_peer_decref(peer);
 391         }
 392
 393         kmem_cache_free(kptllnd_data.kptl_rx_cache, rx);
 394 }
 395
 396 void
 397 kptllnd_rx_buffer_callback (ptl_event_t *ev)
 398 {
 399         kptl_eventarg_t        *eva = ev->md.user_ptr;
 400         kptl_rx_buffer_t       *rxb = kptllnd_eventarg2obj(eva);
 401         kptl_rx_buffer_pool_t  *rxbp = rxb->rxb_pool;
 402         kptl_rx_t              *rx;
 403         int                     unlinked;
 404         unsigned long           flags;
 405
 406 #ifdef LUSTRE_PORTALS_UNLINK_SEMANTICS
 407         unlinked = ev->unlinked;
 408 #else
 409         unlinked = ev->type == PTL_EVENT_UNLINK;
 410 #endif
 411
 412         CDEBUG(D_NET, "%s: %s(%d) rxb=%p fail=%s(%d) unlink=%d\n",
 413                kptllnd_ptlid2str(ev->initiator),
 414                kptllnd_evtype2str(ev->type), ev->type, rxb,
 415                kptllnd_errtype2str(ev->ni_fail_type), ev->ni_fail_type,
 416                unlinked);
 417
 418         LASSERT (!rxb->rxb_idle);
 419         LASSERT (ev->md.start == rxb->rxb_buffer);
 420         LASSERT (ev->offset + ev->mlength <=
 421                  PAGE_SIZE * *kptllnd_tunables.kptl_rxb_npages);
 422         LASSERT (ev->type == PTL_EVENT_PUT_END ||
 423                  ev->type == PTL_EVENT_UNLINK);
 424         LASSERT (ev->type == PTL_EVENT_UNLINK ||
 425                  ev->match_bits == LNET_MSG_MATCHBITS);
 426
 427         if (ev->ni_fail_type != PTL_NI_OK) {
 428                 CERROR("Portals error from %s: %s(%d) rxb=%p fail=%s(%d) unlink=%dn",
 429                        kptllnd_ptlid2str(ev->initiator),
 430                        kptllnd_evtype2str(ev->type), ev->type, rxb,
 431                        kptllnd_errtype2str(ev->ni_fail_type),
 432                        ev->ni_fail_type, unlinked);
 433         } else if (ev->type == PTL_EVENT_PUT_END &&
 434                    !rxbp->rxbp_shutdown) {
 435
 436                 /* rxbp_shutdown sampled without locking!  I only treat it as a
 437                  * hint since shutdown can start while rx's are queued on
 438                  * kptl_sched_rxq. */
 439 #if (PTL_MD_LOCAL_ALIGN8 == 0)
 440                 /* Portals can't force message alignment - someone sending an
 441                  * odd-length message will misalign subsequent messages and
 442                  * force the fixup below...  */
 443                 if ((ev->mlength & 7) != 0)
 444                         CWARN("Message from %s has odd length "LPU64": "
 445                               "probable version incompatibility\n",
 446                               kptllnd_ptlid2str(ev->initiator),
 447                               (__u64)ev->mlength);
 448 #endif
 449                 rx = kptllnd_rx_alloc();
 450                 if (rx == NULL) {
 451                         CERROR("Message from %s dropped: ENOMEM",
 452                                kptllnd_ptlid2str(ev->initiator));
 453                 } else {
 454                         if ((ev->offset & 7) == 0) {
 455                                 kptllnd_rx_buffer_addref(rxb);
 456                                 rx->rx_rxb = rxb;
 457                                 rx->rx_nob = ev->mlength;
 458                                 rx->rx_msg = (kptl_msg_t *)
 459                                              (rxb->rxb_buffer + ev->offset);
 460                         } else {
 461 #if (PTL_MD_LOCAL_ALIGN8 == 0)
 462                                 /* Portals can't force alignment - copy into
 463                                  * rx_space (avoiding overflow) to fix */
 464                                 int maxlen = *kptllnd_tunables.kptl_max_msg_size;
 465
 466                                 rx->rx_rxb = NULL;
 467                                 rx->rx_nob = MIN(maxlen, ev->mlength);
 468                                 rx->rx_msg = (kptl_msg_t *)rx->rx_space;
 469                                 memcpy(rx->rx_msg, rxb->rxb_buffer + ev->offset,
 470                                        rx->rx_nob);
 471 #else
 472                                 /* Portals should have forced the alignment */
 473                                 LBUG();
 474 #endif
 475                         }
 476
 477                         rx->rx_initiator = ev->initiator;
 478                         rx->rx_treceived = jiffies;
 479                         /* Queue for attention */
 480                         spin_lock_irqsave(&kptllnd_data.kptl_sched_lock,
 481                                               flags);
 482
 483                         cfs_list_add_tail(&rx->rx_list,
 484                                           &kptllnd_data.kptl_sched_rxq);
 485                         cfs_waitq_signal(&kptllnd_data.kptl_sched_waitq);
 486
 487                         spin_unlock_irqrestore(&kptllnd_data. \
 488                                                    kptl_sched_lock, flags);
 489                 }
 490         }
 491
 492         if (unlinked) {
 493                 spin_lock_irqsave(&rxbp->rxbp_lock, flags);
 494
 495                 rxb->rxb_posted = 0;
 496                 rxb->rxb_mdh = PTL_INVALID_HANDLE;
 497                 kptllnd_rx_buffer_decref_locked(rxb);
 498
 499                 spin_unlock_irqrestore(&rxbp->rxbp_lock, flags);
 500         }
 501 }
 502
 503 void
 504 kptllnd_nak (ptl_process_id_t dest)
 505 {
 506         /* Fire-and-forget a stub message that will let the peer know my
 507          * protocol magic/version and make her drop/refresh any peer state she
 508          * might have with me. */
 509         ptl_md_t md = {
 510                 .start        = kptllnd_data.kptl_nak_msg,
 511                 .length       = kptllnd_data.kptl_nak_msg->ptlm_nob,
 512                 .threshold    = 1,
 513                 .options      = 0,
 514                 .user_ptr     = NULL,
 515                 .eq_handle    = PTL_EQ_NONE};
 516         ptl_handle_md_t   mdh;
 517         int               rc;
 518
 519         rc = PtlMDBind(kptllnd_data.kptl_nih, md, PTL_UNLINK, &mdh);
 520         if (rc != PTL_OK) {
 521                 CWARN("Can't NAK %s: bind failed %s(%d)\n",
 522                       kptllnd_ptlid2str(dest), kptllnd_errtype2str(rc), rc);
 523                 return;
 524         }
 525
 526         rc = PtlPut(mdh, PTL_NOACK_REQ, dest,
 527                     *kptllnd_tunables.kptl_portal, 0,
 528                     LNET_MSG_MATCHBITS, 0, 0);
 529         if (rc != PTL_OK) {
 530                 CWARN("Can't NAK %s: put failed %s(%d)\n",
 531                       kptllnd_ptlid2str(dest), kptllnd_errtype2str(rc), rc);
 532         }
 533 }
 534
 535 kptl_net_t *
 536 kptllnd_find_net (lnet_nid_t nid)
 537 {
 538         kptl_net_t *net;
 539
 540         read_lock(&kptllnd_data.kptl_net_rw_lock);
 541         cfs_list_for_each_entry (net, &kptllnd_data.kptl_nets, net_list) {
 542                 LASSERT (!net->net_shutdown);
 543
 544                 if (net->net_ni->ni_nid == nid) {
 545                         kptllnd_net_addref(net);
 546                         read_unlock(&kptllnd_data.kptl_net_rw_lock);
 547                         return net;
 548                 }
 549         }
 550         read_unlock(&kptllnd_data.kptl_net_rw_lock);
 551
 552         return NULL;
 553 }
 554
 555 void
 556 kptllnd_rx_parse(kptl_rx_t *rx)
 557 {
 558         kptl_msg_t             *msg = rx->rx_msg;
 559         int                     rc = 0;
 560         int                     post_credit = PTLLND_POSTRX_PEER_CREDIT;
 561         kptl_net_t             *net = NULL;
 562         kptl_peer_t            *peer;
 563         cfs_list_t              txs;
 564         unsigned long           flags;
 565         lnet_process_id_t       srcid;
 566
 567         LASSERT (!cfs_in_interrupt());
 568         LASSERT (rx->rx_peer == NULL);
 569
 570         CFS_INIT_LIST_HEAD(&txs);
 571
 572         if ((rx->rx_nob >= 4 &&
 573              (msg->ptlm_magic == LNET_PROTO_MAGIC ||
 574               msg->ptlm_magic == __swab32(LNET_PROTO_MAGIC))) ||
 575             (rx->rx_nob >= 6 &&
 576              ((msg->ptlm_magic == PTLLND_MSG_MAGIC &&
 577                msg->ptlm_version != PTLLND_MSG_VERSION) ||
 578               (msg->ptlm_magic == __swab32(PTLLND_MSG_MAGIC) &&
 579                msg->ptlm_version != __swab16(PTLLND_MSG_VERSION))))) {
 580                 /* NAK incompatible versions
 581                  * See other LNDs for how to handle this if/when ptllnd begins
 582                  * to allow different versions to co-exist */
 583                 CERROR("Bad version: got %04x expected %04x from %s\n",
 584                        (__u32)(msg->ptlm_magic == PTLLND_MSG_MAGIC ?
 585                                msg->ptlm_version : __swab16(msg->ptlm_version)),
 586                         PTLLND_MSG_VERSION, kptllnd_ptlid2str(rx->rx_initiator));
 587                 /* NB backward compatibility */
 588                 kptllnd_nak(rx->rx_initiator);
 589                 goto rx_done;
 590         }
 591
 592         rc = kptllnd_msg_unpack(msg, rx->rx_nob);
 593         if (rc != 0) {
 594                 CERROR ("Error %d unpacking rx from %s\n",
 595                         rc, kptllnd_ptlid2str(rx->rx_initiator));
 596                 goto rx_done;
 597         }
 598
 599         srcid.nid = msg->ptlm_srcnid;
 600         srcid.pid = msg->ptlm_srcpid;
 601
 602         CDEBUG(D_NETTRACE, "%s: RX %s c %d %p rxb %p queued %lu ticks (%ld s)\n",
 603                libcfs_id2str(srcid), kptllnd_msgtype2str(msg->ptlm_type),
 604                msg->ptlm_credits, rx, rx->rx_rxb,
 605                jiffies - rx->rx_treceived,
 606                cfs_duration_sec(jiffies - rx->rx_treceived));
 607
 608         if (kptllnd_lnet2ptlnid(srcid.nid) != rx->rx_initiator.nid) {
 609                 CERROR("Bad source nid %s from %s\n",
 610                        libcfs_id2str(srcid),
 611                        kptllnd_ptlid2str(rx->rx_initiator));
 612                 goto rx_done;
 613         }
 614
 615         if (msg->ptlm_type == PTLLND_MSG_TYPE_NAK) {
 616                 peer = kptllnd_id2peer(srcid);
 617                 if (peer == NULL)
 618                         goto rx_done;
 619
 620                 CWARN("NAK from %s (%d:%s)\n",
 621                       libcfs_id2str(srcid), peer->peer_state,
 622                       kptllnd_ptlid2str(rx->rx_initiator));
 623
 624                 /* NB can't nuke new peer - bug 17546 comment 31 */
 625                 if (peer->peer_state == PEER_STATE_WAITING_HELLO) {
 626                         CDEBUG(D_NET, "Stale NAK from %s(%s): WAITING_HELLO\n",
 627                                libcfs_id2str(srcid),
 628                                kptllnd_ptlid2str(rx->rx_initiator));
 629                         kptllnd_peer_decref(peer);
 630                         goto rx_done;
 631                 }
 632
 633                 rc = -EPROTO;
 634                 goto failed;
 635         }
 636
 637         net = kptllnd_find_net(msg->ptlm_dstnid);
 638         if (net == NULL || msg->ptlm_dstpid != the_lnet.ln_pid) {
 639                 CERROR("Bad dstid %s from %s\n",
 640                        libcfs_id2str((lnet_process_id_t) {
 641                                .nid = msg->ptlm_dstnid,
 642                                .pid = msg->ptlm_dstpid}),
 643                        kptllnd_ptlid2str(rx->rx_initiator));
 644                 goto rx_done;
 645         }
 646
 647         if (LNET_NIDNET(srcid.nid) != LNET_NIDNET(net->net_ni->ni_nid)) {
 648                 lnet_nid_t nid = LNET_MKNID(LNET_NIDNET(net->net_ni->ni_nid),
 649                                             LNET_NIDADDR(srcid.nid));
 650                 CERROR("Bad source nid %s from %s, %s expected.\n",
 651                        libcfs_id2str(srcid),
 652                        kptllnd_ptlid2str(rx->rx_initiator),
 653                        libcfs_nid2str(nid));
 654                 goto rx_done;
 655         }
 656
 657         if (msg->ptlm_type == PTLLND_MSG_TYPE_HELLO) {
 658                 peer = kptllnd_peer_handle_hello(net, rx->rx_initiator, msg);
 659                 if (peer == NULL)
 660                         goto rx_done;
 661         } else {
 662                 peer = kptllnd_id2peer(srcid);
 663                 if (peer == NULL) {
 664                         CWARN("NAK %s: no connection, %s must reconnect\n",
 665                               kptllnd_msgtype2str(msg->ptlm_type),
 666                               libcfs_id2str(srcid));
 667                         /* NAK to make the peer reconnect */
 668                         kptllnd_nak(rx->rx_initiator);
 669                         goto rx_done;
 670                 }
 671
 672                 /* Ignore any messages for a previous incarnation of me */
 673                 if (msg->ptlm_dststamp < peer->peer_myincarnation) {
 674                         kptllnd_peer_decref(peer);
 675                         goto rx_done;
 676                 }
 677
 678                 if (msg->ptlm_dststamp != peer->peer_myincarnation) {
 679                         CERROR("%s: Unexpected dststamp "LPX64" "
 680                                "("LPX64" expected)\n",
 681                                libcfs_id2str(peer->peer_id), msg->ptlm_dststamp,
 682                                peer->peer_myincarnation);
 683                         rc = -EPROTO;
 684                         goto failed;
 685                 }
 686
 687                 if (peer->peer_state == PEER_STATE_WAITING_HELLO) {
 688                         /* recoverable error - restart txs */
 689                         spin_lock_irqsave(&peer->peer_lock, flags);
 690                         kptllnd_cancel_txlist(&peer->peer_sendq, &txs);
 691                         spin_unlock_irqrestore(&peer->peer_lock, flags);
 692
 693                         CWARN("NAK %s: Unexpected %s message\n",
 694                               libcfs_id2str(srcid),
 695                               kptllnd_msgtype2str(msg->ptlm_type));
 696                         kptllnd_nak(rx->rx_initiator);
 697                         rc = -EPROTO;
 698                         goto failed;
 699                 }
 700
 701                 if (msg->ptlm_srcstamp != peer->peer_incarnation) {
 702                         CERROR("%s: Unexpected srcstamp "LPX64" "
 703                                "("LPX64" expected)\n",
 704                                libcfs_id2str(srcid),
 705                                msg->ptlm_srcstamp,
 706                                peer->peer_incarnation);
 707                         rc = -EPROTO;
 708                         goto failed;
 709                 }
 710         }
 711
 712         LASSERTF (LNET_NIDADDR(msg->ptlm_srcnid) ==
 713                          LNET_NIDADDR(peer->peer_id.nid), "m %s p %s\n",
 714                   libcfs_nid2str(msg->ptlm_srcnid),
 715                   libcfs_nid2str(peer->peer_id.nid));
 716         LASSERTF (msg->ptlm_srcpid == peer->peer_id.pid, "m %u p %u\n",
 717                   msg->ptlm_srcpid, peer->peer_id.pid);
 718
 719         spin_lock_irqsave(&peer->peer_lock, flags);
 720
 721         /* Check peer only sends when I've sent her credits */
 722         if (peer->peer_sent_credits == 0) {
 723                 int  c = peer->peer_credits;
 724                 int oc = peer->peer_outstanding_credits;
 725                 int sc = peer->peer_sent_credits;
 726
 727                 spin_unlock_irqrestore(&peer->peer_lock, flags);
 728
 729                 CERROR("%s: buffer overrun [%d/%d+%d]\n",
 730                        libcfs_id2str(peer->peer_id), c, sc, oc);
 731                 rc = -EPROTO;
 732                 goto failed;
 733         }
 734         peer->peer_sent_credits--;
 735
 736         /* No check for credit overflow - the peer may post new
 737          * buffers after the startup handshake. */
 738         peer->peer_credits += msg->ptlm_credits;
 739
 740         /* This ensures the credit taken by NOOP can be returned */
 741         if (msg->ptlm_type == PTLLND_MSG_TYPE_NOOP) {
 742                 peer->peer_outstanding_credits++;
 743                 post_credit = PTLLND_POSTRX_NO_CREDIT;
 744         }
 745
 746         spin_unlock_irqrestore(&peer->peer_lock, flags);
 747
 748         /* See if something can go out now that credits have come in */
 749         if (msg->ptlm_credits != 0)
 750                 kptllnd_peer_check_sends(peer);
 751
 752         /* ptllnd-level protocol correct - rx takes my ref on peer and increments
 753          * peer_outstanding_credits when it completes */
 754         rx->rx_peer = peer;
 755         kptllnd_peer_alive(peer);
 756
 757         switch (msg->ptlm_type) {
 758         default:
 759                 /* already checked by kptllnd_msg_unpack() */
 760                 LBUG();
 761
 762         case PTLLND_MSG_TYPE_HELLO:
 763                 CDEBUG(D_NET, "PTLLND_MSG_TYPE_HELLO\n");
 764                 goto rx_done;
 765
 766         case PTLLND_MSG_TYPE_NOOP:
 767                 CDEBUG(D_NET, "PTLLND_MSG_TYPE_NOOP\n");
 768                 goto rx_done;
 769
 770         case PTLLND_MSG_TYPE_IMMEDIATE:
 771                 CDEBUG(D_NET, "PTLLND_MSG_TYPE_IMMEDIATE\n");
 772                 rc = lnet_parse(net->net_ni,
 773                                 &msg->ptlm_u.immediate.kptlim_hdr,
 774                                 msg->ptlm_srcnid,
 775                                 rx, 0);
 776                 if (rc >= 0) {                  /* kptllnd_recv owns 'rx' now */
 777                         kptllnd_net_decref(net);
 778                         return;
 779                 }
 780                 goto failed;
 781
 782         case PTLLND_MSG_TYPE_PUT:
 783         case PTLLND_MSG_TYPE_GET:
 784                 CDEBUG(D_NET, "PTLLND_MSG_TYPE_%s\n",
 785                         msg->ptlm_type == PTLLND_MSG_TYPE_PUT ?
 786                         "PUT" : "GET");
 787
 788                 /* checked in kptllnd_msg_unpack() */
 789                 LASSERT (msg->ptlm_u.rdma.kptlrm_matchbits >=
 790                          PTL_RESERVED_MATCHBITS);
 791
 792                 /* Update last match bits seen */
 793                 spin_lock_irqsave(&peer->peer_lock, flags);
 794
 795                 if (msg->ptlm_u.rdma.kptlrm_matchbits >
 796                     rx->rx_peer->peer_last_matchbits_seen)
 797                         rx->rx_peer->peer_last_matchbits_seen =
 798                                 msg->ptlm_u.rdma.kptlrm_matchbits;
 799
 800                 spin_unlock_irqrestore(&rx->rx_peer->peer_lock, flags);
 801
 802                 rc = lnet_parse(net->net_ni,
 803                                 &msg->ptlm_u.rdma.kptlrm_hdr,
 804                                 msg->ptlm_srcnid,
 805                                 rx, 1);
 806                 if (rc >= 0) {                  /* kptllnd_recv owns 'rx' now */
 807                         kptllnd_net_decref(net);
 808                         return;
 809                 }
 810                 goto failed;
 811         }
 812
 813  failed:
 814         LASSERT (rc != 0);
 815         kptllnd_peer_close(peer, rc);
 816         if (rx->rx_peer == NULL)                /* drop ref on peer */
 817                 kptllnd_peer_decref(peer);      /* unless rx_done will */
 818         if (!cfs_list_empty(&txs)) {
 819                 LASSERT (net != NULL);
 820                 kptllnd_restart_txs(net, srcid, &txs);
 821         }
 822  rx_done:
 823         if (net != NULL)
 824                 kptllnd_net_decref(net);
 825         kptllnd_rx_done(rx, post_credit);
 826 }