lnet/selftest/rpc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *   Author: Isaac Huang <isaac@clusterfs.com>
   6  *
   7  */
   8
   9 #define DEBUG_SUBSYSTEM S_LNET
  10
  11 #include "selftest.h"
  12
  13
  14 #define SRPC_PEER_HASH_SIZE       101  /* # peer lists */
  15
  16 typedef enum {
  17         SRPC_STATE_NONE,
  18         SRPC_STATE_NI_INIT,
  19         SRPC_STATE_EQ_INIT,
  20         SRPC_STATE_WI_INIT,
  21         SRPC_STATE_RUNNING,
  22         SRPC_STATE_STOPPING,
  23 } srpc_state_t;
  24
  25 struct smoketest_rpc {
  26         spinlock_t        rpc_glock;     /* global lock */
  27         srpc_service_t   *rpc_services[SRPC_SERVICE_MAX_ID + 1];
  28         struct list_head *rpc_peers;     /* hash table of known peers */
  29         lnet_handle_eq_t  rpc_lnet_eq;   /* _the_ LNet event queue */
  30         srpc_state_t      rpc_state;
  31         srpc_counters_t   rpc_counters;
  32         __u64             rpc_matchbits; /* matchbits counter */
  33 } srpc_data;
  34
  35 static int srpc_peer_credits = 16;
  36 CFS_MODULE_PARM(srpc_peer_credits, "i", int, 0444,
  37                 "# in-flight RPCs per peer (16 by default)");
  38
  39 /* forward ref's */
  40 int srpc_handle_rpc (swi_workitem_t *wi);
  41
  42 void srpc_get_counters (srpc_counters_t *cnt)
  43 {
  44         spin_lock(&srpc_data.rpc_glock);
  45         *cnt = srpc_data.rpc_counters;
  46         spin_unlock(&srpc_data.rpc_glock);
  47 }
  48
  49 void srpc_set_counters (const srpc_counters_t *cnt)
  50 {
  51         spin_lock(&srpc_data.rpc_glock);
  52         srpc_data.rpc_counters = *cnt;
  53         spin_unlock(&srpc_data.rpc_glock);
  54 }
  55
  56 void
  57 srpc_add_bulk_page (srpc_bulk_t *bk, cfs_page_t *pg, int i)
  58 {
  59         LASSERT (i >= 0 && i < bk->bk_niov);
  60
  61 #ifdef __KERNEL__
  62         bk->bk_iovs[i].kiov_offset = 0;
  63         bk->bk_iovs[i].kiov_page   = pg;
  64         bk->bk_iovs[i].kiov_len    = CFS_PAGE_SIZE;
  65 #else
  66         LASSERT (bk->bk_pages != NULL);
  67
  68         bk->bk_pages[i] = pg;
  69         bk->bk_iovs[i].iov_len  = CFS_PAGE_SIZE;
  70         bk->bk_iovs[i].iov_base = cfs_page_address(pg);
  71 #endif
  72         return;
  73 }
  74
  75 void
  76 srpc_free_bulk (srpc_bulk_t *bk)
  77 {
  78         int         i;
  79         cfs_page_t *pg;
  80
  81         LASSERT (bk != NULL);
  82 #ifndef __KERNEL__
  83         LASSERT (bk->bk_pages != NULL);
  84 #endif
  85
  86         for (i = 0; i < bk->bk_niov; i++) {
  87 #ifdef __KERNEL__
  88                 pg = bk->bk_iovs[i].kiov_page;
  89 #else
  90                 pg = bk->bk_pages[i];
  91 #endif
  92                 if (pg == NULL) break;
  93
  94                 cfs_free_page(pg);
  95         }
  96
  97 #ifndef __KERNEL__
  98         LIBCFS_FREE(bk->bk_pages, sizeof(cfs_page_t *) * bk->bk_niov);
  99 #endif
 100         LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
 101         return;
 102 }
 103
 104 srpc_bulk_t *
 105 srpc_alloc_bulk (int npages, int sink)
 106 {
 107         srpc_bulk_t  *bk;
 108         cfs_page_t  **pages;
 109         int           i;
 110
 111         LASSERT (npages > 0 && npages <= LNET_MAX_IOV);
 112
 113         LIBCFS_ALLOC(bk, offsetof(srpc_bulk_t, bk_iovs[npages]));
 114         if (bk == NULL) {
 115                 CERROR ("Can't allocate descriptor for %d pages\n", npages);
 116                 return NULL;
 117         }
 118
 119         memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[npages]));
 120         bk->bk_sink = sink;
 121         bk->bk_niov = npages;
 122         bk->bk_len  = npages * CFS_PAGE_SIZE;
 123 #ifndef __KERNEL__
 124         LIBCFS_ALLOC(pages, sizeof(cfs_page_t *) * npages);
 125         if (pages == NULL) {
 126                 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[npages]));
 127                 CERROR ("Can't allocate page array for %d pages\n", npages);
 128                 return NULL;
 129         }
 130
 131         memset(pages, 0, sizeof(cfs_page_t *) * npages);
 132         bk->bk_pages = pages;
 133 #else
 134         UNUSED (pages);
 135 #endif
 136
 137         for (i = 0; i < npages; i++) {
 138                 cfs_page_t *pg = cfs_alloc_page(CFS_ALLOC_STD);
 139
 140                 if (pg == NULL) {
 141                         CERROR ("Can't allocate page %d of %d\n", i, npages);
 142                         srpc_free_bulk(bk);
 143                         return NULL;
 144                 }
 145
 146                 srpc_add_bulk_page(bk, pg, i);
 147         }
 148
 149         return bk;
 150 }
 151
 152
 153 static inline struct list_head *
 154 srpc_nid2peerlist (lnet_nid_t nid)
 155 {
 156         unsigned int hash = ((unsigned int)nid) % SRPC_PEER_HASH_SIZE;
 157
 158         return &srpc_data.rpc_peers[hash];
 159 }
 160
 161 static inline srpc_peer_t *
 162 srpc_create_peer (lnet_nid_t nid)
 163 {
 164         srpc_peer_t *peer;
 165
 166         LASSERT (nid != LNET_NID_ANY);
 167
 168         LIBCFS_ALLOC(peer, sizeof(srpc_peer_t));
 169         if (peer == NULL) {
 170                 CERROR ("Failed to allocate peer structure for %s\n",
 171                         libcfs_nid2str(nid));
 172                 return NULL;
 173         }
 174
 175         memset(peer, 0, sizeof(srpc_peer_t));
 176         peer->stp_nid     = nid;
 177         peer->stp_credits = srpc_peer_credits;
 178
 179         spin_lock_init(&peer->stp_lock);
 180         CFS_INIT_LIST_HEAD(&peer->stp_rpcq);
 181         CFS_INIT_LIST_HEAD(&peer->stp_ctl_rpcq);
 182         return peer;
 183 }
 184
 185 srpc_peer_t *
 186 srpc_find_peer_locked (lnet_nid_t nid)
 187 {
 188         struct list_head *peer_list = srpc_nid2peerlist(nid);
 189         srpc_peer_t      *peer;
 190
 191         LASSERT (nid != LNET_NID_ANY);
 192
 193         list_for_each_entry (peer, peer_list, stp_list) {
 194                 if (peer->stp_nid == nid)
 195                         return peer;
 196         }
 197
 198         return NULL;
 199 }
 200
 201 static srpc_peer_t *
 202 srpc_nid2peer (lnet_nid_t nid)
 203 {
 204         srpc_peer_t *peer;
 205         srpc_peer_t *new_peer;
 206
 207         spin_lock(&srpc_data.rpc_glock);
 208         peer = srpc_find_peer_locked(nid);
 209         spin_unlock(&srpc_data.rpc_glock);
 210
 211         if (peer != NULL)
 212                 return peer;
 213
 214         new_peer = srpc_create_peer(nid);
 215
 216         spin_lock(&srpc_data.rpc_glock);
 217
 218         peer = srpc_find_peer_locked(nid);
 219         if (peer != NULL) {
 220                 spin_unlock(&srpc_data.rpc_glock);
 221                 if (new_peer != NULL)
 222                         LIBCFS_FREE(new_peer, sizeof(srpc_peer_t));
 223
 224                 return peer;
 225         }
 226
 227         if (new_peer == NULL) {
 228                 spin_unlock(&srpc_data.rpc_glock);
 229                 return NULL;
 230         }
 231
 232         list_add_tail(&new_peer->stp_list, srpc_nid2peerlist(nid));
 233         spin_unlock(&srpc_data.rpc_glock);
 234         return new_peer;
 235 }
 236
 237 static inline __u64
 238 srpc_next_id (void)
 239 {
 240         __u64 id;
 241
 242         spin_lock(&srpc_data.rpc_glock);
 243         id = srpc_data.rpc_matchbits++;
 244         spin_unlock(&srpc_data.rpc_glock);
 245         return id;
 246 }
 247
 248 void
 249 srpc_init_server_rpc (srpc_server_rpc_t *rpc,
 250                       srpc_service_t *sv, srpc_buffer_t *buffer)
 251 {
 252         memset(rpc, 0, sizeof(*rpc));
 253         swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc);
 254
 255         rpc->srpc_ev.ev_fired = 1; /* no event expected now */
 256
 257         rpc->srpc_service  = sv;
 258         rpc->srpc_reqstbuf = buffer;
 259         rpc->srpc_peer     = buffer->buf_peer;
 260         rpc->srpc_self     = buffer->buf_self;
 261         rpc->srpc_replymdh = LNET_INVALID_HANDLE;
 262 }
 263
 264 int
 265 srpc_add_service (srpc_service_t *sv)
 266 {
 267         int                id = sv->sv_id;
 268         int                i;
 269         srpc_server_rpc_t *rpc;
 270
 271         LASSERT (sv->sv_concur > 0);
 272         LASSERT (0 <= id && id <= SRPC_SERVICE_MAX_ID);
 273
 274         spin_lock(&srpc_data.rpc_glock);
 275
 276         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
 277
 278         if (srpc_data.rpc_services[id] != NULL) {
 279                 spin_unlock(&srpc_data.rpc_glock);
 280                 return -EBUSY;
 281         }
 282
 283         srpc_data.rpc_services[id] = sv;
 284         spin_unlock(&srpc_data.rpc_glock);
 285
 286         sv->sv_nprune       = 0;
 287         sv->sv_nposted_msg  = 0;
 288         sv->sv_shuttingdown = 0;
 289         spin_lock_init(&sv->sv_lock);
 290         CFS_INIT_LIST_HEAD(&sv->sv_free_rpcq);
 291         CFS_INIT_LIST_HEAD(&sv->sv_active_rpcq);
 292         CFS_INIT_LIST_HEAD(&sv->sv_posted_msgq);
 293         CFS_INIT_LIST_HEAD(&sv->sv_blocked_msgq);
 294
 295         sv->sv_ev.ev_data = sv;
 296         sv->sv_ev.ev_type = SRPC_REQUEST_RCVD;
 297
 298         for (i = 0; i < sv->sv_concur; i++) {
 299                 LIBCFS_ALLOC(rpc, sizeof(*rpc));
 300                 if (rpc == NULL) goto enomem;
 301
 302                 list_add(&rpc->srpc_list, &sv->sv_free_rpcq);
 303         }
 304
 305         CDEBUG (D_NET, "Adding service: id %d, name %s, concurrency %d\n",
 306                 id, sv->sv_name, sv->sv_concur);
 307         return 0;
 308
 309 enomem:
 310         while (!list_empty(&sv->sv_free_rpcq)) {
 311                 rpc = list_entry(sv->sv_free_rpcq.next,
 312                                  srpc_server_rpc_t, srpc_list);
 313                 list_del(&rpc->srpc_list);
 314                 LIBCFS_FREE(rpc, sizeof(*rpc));
 315         }
 316
 317         spin_lock(&srpc_data.rpc_glock);
 318         srpc_data.rpc_services[id] = NULL;
 319         spin_unlock(&srpc_data.rpc_glock);
 320         return -ENOMEM;
 321 }
 322
 323 int
 324 srpc_remove_service (srpc_service_t *sv)
 325 {
 326         int id = sv->sv_id;
 327
 328         spin_lock(&srpc_data.rpc_glock);
 329
 330         if (srpc_data.rpc_services[id] != sv) {
 331                 spin_unlock(&srpc_data.rpc_glock);
 332                 return -ENOENT;
 333         }
 334
 335         srpc_data.rpc_services[id] = NULL;
 336         spin_unlock(&srpc_data.rpc_glock);
 337         return 0;
 338 }
 339
 340 int
 341 srpc_post_passive_rdma(int portal, __u64 matchbits, void *buf,
 342                        int len, int options, lnet_process_id_t peer,
 343                        lnet_handle_md_t *mdh, srpc_event_t *ev)
 344 {
 345         int              rc;
 346         lnet_md_t        md;
 347         lnet_handle_me_t meh;
 348
 349         rc = LNetMEAttach(portal, peer, matchbits, 0,
 350                           LNET_UNLINK, LNET_INS_AFTER, &meh);
 351         if (rc != 0) {
 352                 CERROR ("LNetMEAttach failed: %d\n", rc);
 353                 LASSERT (rc == -ENOMEM);
 354                 return -ENOMEM;
 355         }
 356
 357         md.threshold = 1;
 358         md.user_ptr  = ev;
 359         md.start     = buf;
 360         md.length    = len;
 361         md.options   = options;
 362         md.eq_handle = srpc_data.rpc_lnet_eq;
 363
 364         rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
 365         if (rc != 0) {
 366                 CERROR ("LNetMDAttach failed: %d\n", rc);
 367                 LASSERT (rc == -ENOMEM);
 368
 369                 rc = LNetMEUnlink(meh);
 370                 LASSERT (rc == 0);
 371                 return -ENOMEM;
 372         }
 373
 374         CDEBUG (D_NET,
 375                 "Posted passive RDMA: peer %s, portal %d, matchbits "LPX64"\n",
 376                 libcfs_id2str(peer), portal, matchbits);
 377         return 0;
 378 }
 379
 380 int
 381 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
 382                       int options, lnet_process_id_t peer, lnet_nid_t self,
 383                       lnet_handle_md_t *mdh, srpc_event_t *ev)
 384 {
 385         int       rc;
 386         lnet_md_t md;
 387
 388         md.user_ptr  = ev;
 389         md.start     = buf;
 390         md.length    = len;
 391         md.eq_handle = srpc_data.rpc_lnet_eq;
 392         md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
 393         md.options   = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
 394
 395         rc = LNetMDBind(md, LNET_UNLINK, mdh);
 396         if (rc != 0) {
 397                 CERROR ("LNetMDBind failed: %d\n", rc);
 398                 LASSERT (rc == -ENOMEM);
 399                 return -ENOMEM;
 400         }
 401
 402         /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
 403          * they're only meaningful for MDs attached to an ME (i.e. passive
 404          * buffers... */
 405         if ((options & LNET_MD_OP_PUT) != 0) {
 406                 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
 407                              portal, matchbits, 0, 0);
 408         } else {
 409                 LASSERT ((options & LNET_MD_OP_GET) != 0);
 410
 411                 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
 412         }
 413
 414         if (rc != 0) {
 415                 CERROR ("LNet%s(%s, %d, "LPD64") failed: %d\n",
 416                         ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
 417                         libcfs_id2str(peer), portal, matchbits, rc);
 418
 419                 /* The forthcoming unlink event will complete this operation
 420                  * with failure, so fall through and return success here.
 421                  */
 422                 rc = LNetMDUnlink(*mdh);
 423                 LASSERT (rc == 0);
 424         } else {
 425                 CDEBUG (D_NET,
 426                         "Posted active RDMA: peer %s, portal %u, matchbits "LPX64"\n",
 427                         libcfs_id2str(peer), portal, matchbits);
 428         }
 429         return 0;
 430 }
 431
 432 int
 433 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
 434                         int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
 435 {
 436         int rc;
 437         int portal;
 438
 439         if (service > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 440                 portal = SRPC_REQUEST_PORTAL;
 441         else
 442                 portal = SRPC_FRAMEWORK_REQUEST_PORTAL;
 443
 444         rc = srpc_post_active_rdma(portal, service, buf, len,
 445                                    LNET_MD_OP_PUT, peer,
 446                                    LNET_NID_ANY, mdh, ev);
 447         return rc;
 448 }
 449
 450 int
 451 srpc_post_passive_rqtbuf(int service, void *buf, int len,
 452                          lnet_handle_md_t *mdh, srpc_event_t *ev)
 453 {
 454         int               rc;
 455         int               portal;
 456         lnet_process_id_t any = {.nid = LNET_NID_ANY,
 457                                  .pid = LNET_PID_ANY};
 458
 459         if (service > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 460                 portal = SRPC_REQUEST_PORTAL;
 461         else
 462                 portal = SRPC_FRAMEWORK_REQUEST_PORTAL;
 463
 464         rc = srpc_post_passive_rdma(portal, service, buf, len,
 465                                     LNET_MD_OP_PUT, any, mdh, ev);
 466         return rc;
 467 }
 468
 469 int
 470 srpc_service_post_buffer (srpc_service_t *sv, srpc_buffer_t *buf)
 471 {
 472         srpc_msg_t *msg = &buf->buf_msg;
 473         int         rc;
 474
 475         LASSERT (!sv->sv_shuttingdown);
 476
 477         buf->buf_mdh = LNET_INVALID_HANDLE;
 478         list_add(&buf->buf_list, &sv->sv_posted_msgq);
 479         sv->sv_nposted_msg++;
 480         spin_unlock(&sv->sv_lock);
 481
 482         rc = srpc_post_passive_rqtbuf(sv->sv_id, msg, sizeof(*msg),
 483                                       &buf->buf_mdh, &sv->sv_ev);
 484
 485         /* At this point, a RPC (new or delayed) may have arrived in
 486          * msg and its event handler has been called. So we must add
 487          * buf to sv_posted_msgq _before_ dropping sv_lock */
 488
 489         spin_lock(&sv->sv_lock);
 490
 491         if (rc == 0) {
 492                 if (sv->sv_shuttingdown) {
 493                         spin_unlock(&sv->sv_lock);
 494
 495                         /* srpc_shutdown_service might have tried to unlink me
 496                          * when my buf_mdh was still invalid */
 497                         LNetMDUnlink(buf->buf_mdh);
 498
 499                         spin_lock(&sv->sv_lock);
 500                 }
 501                 return 0;
 502         }
 503
 504         sv->sv_nposted_msg--;
 505         if (sv->sv_shuttingdown) return rc;
 506
 507         list_del(&buf->buf_list);
 508
 509         spin_unlock(&sv->sv_lock);
 510         LIBCFS_FREE(buf, sizeof(*buf));
 511         spin_lock(&sv->sv_lock);
 512         return rc;
 513 }
 514
 515 int
 516 srpc_service_add_buffers (srpc_service_t *sv, int nbuffer)
 517 {
 518         int                rc;
 519         int                posted;
 520         srpc_buffer_t     *buf;
 521
 522         LASSERTF (nbuffer > 0,
 523                   "nbuffer must be positive: %d\n", nbuffer);
 524
 525         for (posted = 0; posted < nbuffer; posted++) {
 526                 LIBCFS_ALLOC(buf, sizeof(*buf));
 527                 if (buf == NULL) break;
 528
 529                 spin_lock(&sv->sv_lock);
 530                 rc = srpc_service_post_buffer(sv, buf);
 531                 spin_unlock(&sv->sv_lock);
 532
 533                 if (rc != 0) break;
 534         }
 535
 536         return posted;
 537 }
 538
 539 void
 540 srpc_service_remove_buffers (srpc_service_t *sv, int nbuffer)
 541 {
 542         LASSERTF (nbuffer > 0,
 543                   "nbuffer must be positive: %d\n", nbuffer);
 544
 545         spin_lock(&sv->sv_lock);
 546
 547         LASSERT (sv->sv_nprune >= 0);
 548         LASSERT (!sv->sv_shuttingdown);
 549
 550         sv->sv_nprune += nbuffer;
 551
 552         spin_unlock(&sv->sv_lock);
 553         return;
 554 }
 555
 556 /* returns 1 if sv has finished, otherwise 0 */
 557 int
 558 srpc_finish_service (srpc_service_t *sv)
 559 {
 560         srpc_server_rpc_t *rpc;
 561         srpc_buffer_t     *buf;
 562
 563         spin_lock(&sv->sv_lock);
 564
 565         LASSERT (sv->sv_shuttingdown); /* srpc_shutdown_service called */
 566
 567         if (sv->sv_nposted_msg != 0 || !list_empty(&sv->sv_active_rpcq)) {
 568                 CDEBUG (D_NET,
 569                         "waiting for %d posted buffers to unlink and "
 570                         "in-flight RPCs to die.\n",
 571                         sv->sv_nposted_msg);
 572
 573                 if (!list_empty(&sv->sv_active_rpcq)) {
 574                         rpc = list_entry(sv->sv_active_rpcq.next,
 575                                          srpc_server_rpc_t, srpc_list);
 576                         CDEBUG (D_NETERROR,
 577                                 "Active RPC on shutdown: sv %s, peer %s, "
 578                                 "wi %s scheduled %d running %d, "
 579                                 "ev fired %d type %d status %d lnet %d\n",
 580                                 sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 581                                 swi_state2str(rpc->srpc_wi.wi_state),
 582                                 rpc->srpc_wi.wi_scheduled,
 583                                 rpc->srpc_wi.wi_running,
 584                                 rpc->srpc_ev.ev_fired,
 585                                 rpc->srpc_ev.ev_type,
 586                                 rpc->srpc_ev.ev_status,
 587                                 rpc->srpc_ev.ev_lnet);
 588                 }
 589
 590                 spin_unlock(&sv->sv_lock);
 591                 return 0;
 592         }
 593
 594         spin_unlock(&sv->sv_lock); /* no lock needed from now on */
 595
 596         for (;;) {
 597                 struct list_head *q;
 598
 599                 if (!list_empty(&sv->sv_posted_msgq))
 600                         q = &sv->sv_posted_msgq;
 601                 else if (!list_empty(&sv->sv_blocked_msgq))
 602                         q = &sv->sv_blocked_msgq;
 603                 else
 604                         break;
 605
 606                 buf = list_entry(q->next, srpc_buffer_t, buf_list);
 607                 list_del(&buf->buf_list);
 608
 609                 LIBCFS_FREE(buf, sizeof(*buf));
 610         }
 611
 612         while (!list_empty(&sv->sv_free_rpcq)) {
 613                 rpc = list_entry(sv->sv_free_rpcq.next,
 614                                  srpc_server_rpc_t, srpc_list);
 615                 list_del(&rpc->srpc_list);
 616                 LIBCFS_FREE(rpc, sizeof(*rpc));
 617         }
 618
 619         return 1;
 620 }
 621
 622 /* called with sv->sv_lock held */
 623 void
 624 srpc_service_recycle_buffer (srpc_service_t *sv, srpc_buffer_t *buf)
 625 {
 626         if (sv->sv_shuttingdown) goto free;
 627
 628         if (sv->sv_nprune == 0) {
 629                 if (srpc_service_post_buffer(sv, buf) != 0)
 630                         CWARN ("Failed to post %s buffer\n", sv->sv_name);
 631                 return;
 632         }
 633
 634         sv->sv_nprune--;
 635 free:
 636         spin_unlock(&sv->sv_lock);
 637         LIBCFS_FREE(buf, sizeof(*buf));
 638         spin_lock(&sv->sv_lock);
 639 }
 640
 641 void
 642 srpc_shutdown_service (srpc_service_t *sv)
 643 {
 644         srpc_server_rpc_t *rpc;
 645         srpc_buffer_t     *buf;
 646
 647         spin_lock(&sv->sv_lock);
 648
 649         CDEBUG (D_NET, "Shutting down service: id %d, name %s\n",
 650                 sv->sv_id, sv->sv_name);
 651
 652         sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
 653
 654         /* schedule in-flight RPCs to notice the shutdown */
 655         list_for_each_entry (rpc, &sv->sv_active_rpcq, srpc_list) {
 656                 swi_schedule_workitem(&rpc->srpc_wi);
 657         }
 658
 659         spin_unlock(&sv->sv_lock);
 660
 661         /* OK to traverse sv_posted_msgq without lock, since no one
 662          * touches sv_posted_msgq now */
 663         list_for_each_entry (buf, &sv->sv_posted_msgq, buf_list)
 664                 LNetMDUnlink(buf->buf_mdh);
 665
 666         return;
 667 }
 668
 669 int
 670 srpc_send_request (srpc_client_rpc_t *rpc)
 671 {
 672         srpc_event_t *ev = &rpc->crpc_reqstev;
 673         int           rc;
 674
 675         ev->ev_fired = 0;
 676         ev->ev_data  = rpc;
 677         ev->ev_type  = SRPC_REQUEST_SENT;
 678
 679         rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
 680                                      &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
 681                                      &rpc->crpc_reqstmdh, ev);
 682         if (rc != 0) {
 683                 LASSERT (rc == -ENOMEM);
 684                 ev->ev_fired = 1;  /* no more event expected */
 685         }
 686         return rc;
 687 }
 688
 689 int
 690 srpc_prepare_reply (srpc_client_rpc_t *rpc)
 691 {
 692         srpc_event_t *ev = &rpc->crpc_replyev;
 693         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
 694         int           rc;
 695
 696         ev->ev_fired = 0;
 697         ev->ev_data  = rpc;
 698         ev->ev_type  = SRPC_REPLY_RCVD;
 699
 700         *id = srpc_next_id();
 701
 702         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, *id,
 703                                     &rpc->crpc_replymsg, sizeof(srpc_msg_t),
 704                                     LNET_MD_OP_PUT, rpc->crpc_dest,
 705                                     &rpc->crpc_replymdh, ev);
 706         if (rc != 0) {
 707                 LASSERT (rc == -ENOMEM);
 708                 ev->ev_fired = 1;  /* no more event expected */
 709         }
 710         return rc;
 711 }
 712
 713 int
 714 srpc_prepare_bulk (srpc_client_rpc_t *rpc)
 715 {
 716         srpc_bulk_t  *bk = &rpc->crpc_bulk;
 717         srpc_event_t *ev = &rpc->crpc_bulkev;
 718         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
 719         int           rc;
 720         int           opt;
 721
 722         LASSERT (bk->bk_niov <= LNET_MAX_IOV);
 723
 724         if (bk->bk_niov == 0) return 0; /* nothing to do */
 725
 726         opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
 727 #ifdef __KERNEL__
 728         opt |= LNET_MD_KIOV;
 729 #else
 730         opt |= LNET_MD_IOVEC;
 731 #endif
 732
 733         ev->ev_fired = 0;
 734         ev->ev_data  = rpc;
 735         ev->ev_type  = SRPC_BULK_REQ_RCVD;
 736
 737         *id = srpc_next_id();
 738
 739         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, *id,
 740                                     &bk->bk_iovs[0], bk->bk_niov, opt,
 741                                     rpc->crpc_dest, &bk->bk_mdh, ev);
 742         if (rc != 0) {
 743                 LASSERT (rc == -ENOMEM);
 744                 ev->ev_fired = 1;  /* no more event expected */
 745         }
 746         return rc;
 747 }
 748
 749 int
 750 srpc_do_bulk (srpc_server_rpc_t *rpc)
 751 {
 752         srpc_event_t  *ev = &rpc->srpc_ev;
 753         srpc_bulk_t   *bk = rpc->srpc_bulk;
 754         __u64          id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
 755         int            rc;
 756         int            opt;
 757
 758         LASSERT (bk != NULL);
 759
 760         opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
 761 #ifdef __KERNEL__
 762         opt |= LNET_MD_KIOV;
 763 #else
 764         opt |= LNET_MD_IOVEC;
 765 #endif
 766
 767         ev->ev_fired = 0;
 768         ev->ev_data  = rpc;
 769         ev->ev_type  = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
 770
 771         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
 772                                    &bk->bk_iovs[0], bk->bk_niov, opt,
 773                                    rpc->srpc_peer, rpc->srpc_self,
 774                                    &bk->bk_mdh, ev);
 775         if (rc != 0)
 776                 ev->ev_fired = 1;  /* no more event expected */
 777         return rc;
 778 }
 779
 780 /* called with srpc_service_t::sv_lock held */
 781 inline void
 782 srpc_schedule_server_rpc (srpc_server_rpc_t *rpc)
 783 {
 784         srpc_service_t *sv = rpc->srpc_service;
 785
 786         if (sv->sv_id > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 787                 swi_schedule_workitem(&rpc->srpc_wi);
 788         else    /* framework RPCs are handled one by one */
 789                 swi_schedule_serial_workitem(&rpc->srpc_wi);
 790
 791         return;
 792 }
 793
 794 /* only called from srpc_handle_rpc */
 795 void
 796 srpc_server_rpc_done (srpc_server_rpc_t *rpc, int status)
 797 {
 798         srpc_service_t *sv = rpc->srpc_service;
 799         srpc_buffer_t  *buffer;
 800
 801         LASSERT (status != 0 || rpc->srpc_wi.wi_state == SWI_STATE_DONE);
 802
 803         rpc->srpc_status = status;
 804
 805         CDEBUG (status == 0 ? D_NET : D_NETERROR,
 806                 "Server RPC done: service %s, peer %s, status %s:%d\n",
 807                 sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 808                 swi_state2str(rpc->srpc_wi.wi_state), status);
 809
 810         if (status != 0) {
 811                 spin_lock(&srpc_data.rpc_glock);
 812                 srpc_data.rpc_counters.rpcs_dropped++;
 813                 spin_unlock(&srpc_data.rpc_glock);
 814         }
 815
 816         if (rpc->srpc_done != NULL)
 817                 (*rpc->srpc_done) (rpc);
 818         LASSERT (rpc->srpc_bulk == NULL);
 819
 820         spin_lock(&sv->sv_lock);
 821
 822         if (rpc->srpc_reqstbuf != NULL) {
 823                 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
 824                  * sv won't go away for sv_active_rpcq must not be empty */
 825                 srpc_service_recycle_buffer(sv, rpc->srpc_reqstbuf);
 826                 rpc->srpc_reqstbuf = NULL;
 827         }
 828
 829         list_del(&rpc->srpc_list); /* from sv->sv_active_rpcq */
 830
 831         /*
 832          * No one can schedule me now since:
 833          * - I'm not on sv_active_rpcq.
 834          * - all LNet events have been fired.
 835          * Cancel pending schedules and prevent future schedule attempts:
 836          */
 837         LASSERT (rpc->srpc_ev.ev_fired);
 838         swi_kill_workitem(&rpc->srpc_wi);
 839
 840         if (!sv->sv_shuttingdown && !list_empty(&sv->sv_blocked_msgq)) {
 841                 buffer = list_entry(sv->sv_blocked_msgq.next,
 842                                     srpc_buffer_t, buf_list);
 843                 list_del(&buffer->buf_list);
 844
 845                 srpc_init_server_rpc(rpc, sv, buffer);
 846                 list_add_tail(&rpc->srpc_list, &sv->sv_active_rpcq);
 847                 srpc_schedule_server_rpc(rpc);
 848         } else {
 849                 list_add(&rpc->srpc_list, &sv->sv_free_rpcq);
 850         }
 851
 852         spin_unlock(&sv->sv_lock);
 853         return;
 854 }
 855
 856 /* handles an incoming RPC */
 857 int
 858 srpc_handle_rpc (swi_workitem_t *wi)
 859 {
 860         srpc_server_rpc_t *rpc = wi->wi_data;
 861         srpc_service_t    *sv = rpc->srpc_service;
 862         srpc_event_t      *ev = &rpc->srpc_ev;
 863         int                rc = 0;
 864
 865         LASSERT (wi == &rpc->srpc_wi);
 866
 867         spin_lock(&sv->sv_lock);
 868
 869         if (sv->sv_shuttingdown) {
 870                 spin_unlock(&sv->sv_lock);
 871
 872                 if (rpc->srpc_bulk != NULL)
 873                         LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
 874                 LNetMDUnlink(rpc->srpc_replymdh);
 875
 876                 if (ev->ev_fired) { /* no more event, OK to finish */
 877                         srpc_server_rpc_done(rpc, -ESHUTDOWN);
 878                         return 1;
 879                 }
 880                 return 0;
 881         }
 882
 883         spin_unlock(&sv->sv_lock);
 884
 885         switch (wi->wi_state) {
 886         default:
 887                 LBUG ();
 888         case SWI_STATE_NEWBORN: {
 889                 srpc_msg_t           *msg;
 890                 srpc_generic_reply_t *reply;
 891
 892                 msg = &rpc->srpc_reqstbuf->buf_msg;
 893                 reply = &rpc->srpc_replymsg.msg_body.reply;
 894
 895                 if (msg->msg_version != SRPC_MSG_VERSION &&
 896                     msg->msg_version != __swab32(SRPC_MSG_VERSION)) {
 897                         CWARN ("Version mismatch: %u, %u expected, from %s\n",
 898                                msg->msg_version, SRPC_MSG_VERSION,
 899                                libcfs_id2str(rpc->srpc_peer));
 900                         reply->status = EPROTO;
 901                 } else {
 902                         reply->status = 0;
 903                         rc = (*sv->sv_handler) (rpc);
 904                         LASSERT (reply->status == 0 || !rpc->srpc_bulk);
 905                 }
 906
 907                 if (rc != 0) {
 908                         srpc_server_rpc_done(rpc, rc);
 909                         return 1;
 910                 }
 911
 912                 wi->wi_state = SWI_STATE_BULK_STARTED;
 913
 914                 if (rpc->srpc_bulk != NULL) {
 915                         rc = srpc_do_bulk(rpc);
 916                         if (rc == 0)
 917                                 return 0; /* wait for bulk */
 918
 919                         LASSERT (ev->ev_fired);
 920                         ev->ev_status = rc;
 921                 }
 922         }
 923         case SWI_STATE_BULK_STARTED:
 924                 /* we cannot LASSERT ev_fired right here because it
 925                  * may be set only upon an event with unlinked==1 */
 926
 927                 if (rpc->srpc_bulk != NULL) {
 928                         rc = ev->ev_status;
 929
 930                         if (sv->sv_bulk_ready != NULL)
 931                                 rc = (*sv->sv_bulk_ready) (rpc, rc);
 932
 933                         if (rc != 0) {
 934                                 if (ev->ev_fired) {
 935                                         srpc_server_rpc_done(rpc, rc);
 936                                         return 1;
 937                                 }
 938
 939                                 rpc->srpc_status = rc;
 940                                 wi->wi_state     = SWI_STATE_BULK_ERRORED;
 941                                 LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
 942                                 return 0; /* wait for UNLINK event  */
 943                         }
 944                 }
 945
 946                 LASSERT (rpc->srpc_bulk == NULL || ev->ev_fired);
 947
 948                 wi->wi_state = SWI_STATE_REPLY_SUBMITTED;
 949                 rc = srpc_send_reply(rpc);
 950                 if (rc == 0)
 951                         return 0; /* wait for reply */
 952                 srpc_server_rpc_done(rpc, rc);
 953                 return 1;
 954
 955         case SWI_STATE_REPLY_SUBMITTED:
 956                 LASSERT (ev->ev_fired);
 957
 958                 wi->wi_state = SWI_STATE_DONE;
 959                 srpc_server_rpc_done(rpc, ev->ev_status);
 960                 return 1;
 961
 962         case SWI_STATE_BULK_ERRORED:
 963                 LASSERT (rpc->srpc_bulk != NULL && ev->ev_fired);
 964                 LASSERT (rpc->srpc_status != 0);
 965
 966                 srpc_server_rpc_done(rpc, rpc->srpc_status);
 967                 return 1;
 968         }
 969
 970         return 0;
 971 }
 972
 973 void
 974 srpc_client_rpc_expired (void *data)
 975 {
 976         srpc_client_rpc_t *rpc = data;
 977
 978         CWARN ("Client RPC expired: service %d, peer %s, timeout %d.\n",
 979                rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
 980                rpc->crpc_timeout);
 981
 982         spin_lock(&rpc->crpc_lock);
 983
 984         rpc->crpc_timeout = 0;
 985         srpc_abort_rpc(rpc, -ETIMEDOUT);
 986
 987         spin_unlock(&rpc->crpc_lock);
 988
 989         spin_lock(&srpc_data.rpc_glock);
 990         srpc_data.rpc_counters.rpcs_expired++;
 991         spin_unlock(&srpc_data.rpc_glock);
 992         return;
 993 }
 994
 995 inline void
 996 srpc_add_client_rpc_timer (srpc_client_rpc_t *rpc)
 997 {
 998         stt_timer_t *timer = &rpc->crpc_timer;
 999
1000         if (rpc->crpc_timeout == 0) return;
1001
1002         CFS_INIT_LIST_HEAD(&timer->stt_list);
1003         timer->stt_data    = rpc;
1004         timer->stt_func    = srpc_client_rpc_expired;
1005         timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1006                                           cfs_time_current_sec());
1007         stt_add_timer(timer);
1008         return;
1009 }
1010
1011 /*
1012  * Called with rpc->crpc_lock held.
1013  *
1014  * Upon exit the RPC expiry timer is not queued and the handler is not
1015  * running on any CPU. */
1016 void
1017 srpc_del_client_rpc_timer (srpc_client_rpc_t *rpc)
1018 {
1019         /* timer not planted or already exploded */
1020         if (rpc->crpc_timeout == 0) return;
1021
1022         /* timer sucessfully defused */
1023         if (stt_del_timer(&rpc->crpc_timer)) return;
1024
1025 #ifdef __KERNEL__
1026         /* timer detonated, wait for it to explode */
1027         while (rpc->crpc_timeout != 0) {
1028                 spin_unlock(&rpc->crpc_lock);
1029
1030                 cfs_schedule();
1031
1032                 spin_lock(&rpc->crpc_lock);
1033         }
1034 #else
1035         LBUG(); /* impossible in single-threaded runtime */
1036 #endif
1037         return;
1038 }
1039
1040 void
1041 srpc_check_sends (srpc_peer_t *peer, int credits)
1042 {
1043         struct list_head  *q;
1044         srpc_client_rpc_t *rpc;
1045
1046         LASSERT (credits >= 0);
1047         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1048
1049         spin_lock(&peer->stp_lock);
1050         peer->stp_credits += credits;
1051
1052         while (peer->stp_credits) {
1053                 if (!list_empty(&peer->stp_ctl_rpcq))
1054                         q = &peer->stp_ctl_rpcq;
1055                 else if (!list_empty(&peer->stp_rpcq))
1056                         q = &peer->stp_rpcq;
1057                 else
1058                         break;
1059
1060                 peer->stp_credits--;
1061
1062                 rpc = list_entry(q->next, srpc_client_rpc_t, crpc_privl);
1063                 list_del_init(&rpc->crpc_privl);
1064                 srpc_client_rpc_decref(rpc);  /* --ref for peer->*rpcq */
1065
1066                 swi_schedule_workitem(&rpc->crpc_wi);
1067         }
1068
1069         spin_unlock(&peer->stp_lock);
1070         return;
1071 }
1072
1073 void
1074 srpc_client_rpc_done (srpc_client_rpc_t *rpc, int status)
1075 {
1076         swi_workitem_t *wi = &rpc->crpc_wi;
1077         srpc_peer_t    *peer = rpc->crpc_peer;
1078
1079         LASSERT (status != 0 || wi->wi_state == SWI_STATE_DONE);
1080
1081         spin_lock(&rpc->crpc_lock);
1082
1083         rpc->crpc_closed = 1;
1084         if (rpc->crpc_status == 0)
1085                 rpc->crpc_status = status;
1086
1087         srpc_del_client_rpc_timer(rpc);
1088
1089         CDEBUG ((status == 0) ? D_NET : D_NETERROR,
1090                 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1091                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1092                 swi_state2str(wi->wi_state), rpc->crpc_aborted, status);
1093
1094         /*
1095          * No one can schedule me now since:
1096          * - RPC timer has been defused.
1097          * - all LNet events have been fired.
1098          * - crpc_closed has been set, preventing srpc_abort_rpc from
1099          *   scheduling me.
1100          * Cancel pending schedules and prevent future schedule attempts:
1101          */
1102         LASSERT (!srpc_event_pending(rpc));
1103         swi_kill_workitem(wi);
1104
1105         spin_unlock(&rpc->crpc_lock);
1106
1107         (*rpc->crpc_done) (rpc);
1108
1109         if (peer != NULL)
1110                 srpc_check_sends(peer, 1);
1111         return;
1112 }
1113
1114 /* sends an outgoing RPC */
1115 int
1116 srpc_send_rpc (swi_workitem_t *wi)
1117 {
1118         int                rc = 0;
1119         srpc_client_rpc_t *rpc = wi->wi_data;
1120         srpc_msg_t        *reply = &rpc->crpc_replymsg;
1121         int                do_bulk = rpc->crpc_bulk.bk_niov > 0;
1122
1123         LASSERT (rpc != NULL);
1124         LASSERT (wi == &rpc->crpc_wi);
1125
1126         spin_lock(&rpc->crpc_lock);
1127
1128         if (rpc->crpc_aborted) {
1129                 spin_unlock(&rpc->crpc_lock);
1130                 goto abort;
1131         }
1132
1133         spin_unlock(&rpc->crpc_lock);
1134
1135         switch (wi->wi_state) {
1136         default:
1137                 LBUG ();
1138         case SWI_STATE_NEWBORN:
1139                 LASSERT (!srpc_event_pending(rpc));
1140
1141                 rc = srpc_prepare_reply(rpc);
1142                 if (rc != 0) {
1143                         srpc_client_rpc_done(rpc, rc);
1144                         return 1;
1145                 }
1146
1147                 rc = srpc_prepare_bulk(rpc);
1148                 if (rc != 0) break;
1149
1150                 wi->wi_state = SWI_STATE_REQUEST_SUBMITTED;
1151                 rc = srpc_send_request(rpc);
1152                 break;
1153
1154         case SWI_STATE_REQUEST_SUBMITTED:
1155                 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1156                  * order; however, they're processed in a strict order:
1157                  * rqt, rpy, and bulk. */
1158                 if (!rpc->crpc_reqstev.ev_fired) break;
1159
1160                 rc = rpc->crpc_reqstev.ev_status;
1161                 if (rc != 0) break;
1162
1163                 wi->wi_state = SWI_STATE_REQUEST_SENT;
1164                 /* perhaps more events, fall thru */
1165         case SWI_STATE_REQUEST_SENT: {
1166                 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1167
1168                 if (!rpc->crpc_replyev.ev_fired) break;
1169
1170                 rc = rpc->crpc_replyev.ev_status;
1171                 if (rc != 0) break;
1172
1173                 if ((reply->msg_type != type &&
1174                      reply->msg_type != __swab32(type)) ||
1175                     (reply->msg_magic != SRPC_MSG_MAGIC &&
1176                      reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1177                         CWARN ("Bad message from %s: type %u (%d expected),"
1178                                " magic %u (%d expected).\n",
1179                                libcfs_id2str(rpc->crpc_dest),
1180                                reply->msg_type, type,
1181                                reply->msg_magic, SRPC_MSG_MAGIC);
1182                         rc = -EBADMSG;
1183                         break;
1184                 }
1185
1186                 if (do_bulk && reply->msg_body.reply.status != 0) {
1187                         CWARN ("Remote error %d at %s, unlink bulk buffer in "
1188                                "case peer didn't initiate bulk transfer\n",
1189                                reply->msg_body.reply.status,
1190                                libcfs_id2str(rpc->crpc_dest));
1191                         LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1192                 }
1193
1194                 wi->wi_state = SWI_STATE_REPLY_RECEIVED;
1195         }
1196         case SWI_STATE_REPLY_RECEIVED:
1197                 if (do_bulk && !rpc->crpc_bulkev.ev_fired) break;
1198
1199                 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1200
1201                 /* Bulk buffer was unlinked due to remote error. Clear error
1202                  * since reply buffer still contains valid data.
1203                  * NB rpc->crpc_done shouldn't look into bulk data in case of
1204                  * remote error. */
1205                 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1206                     rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1207                         rc = 0;
1208
1209                 wi->wi_state = SWI_STATE_DONE;
1210                 srpc_client_rpc_done(rpc, rc);
1211                 return 1;
1212         }
1213
1214         if (rc != 0) {
1215                 spin_lock(&rpc->crpc_lock);
1216                 srpc_abort_rpc(rpc, rc);
1217                 spin_unlock(&rpc->crpc_lock);
1218         }
1219
1220 abort:
1221         if (rpc->crpc_aborted) {
1222                 LNetMDUnlink(rpc->crpc_reqstmdh);
1223                 LNetMDUnlink(rpc->crpc_replymdh);
1224                 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1225
1226                 if (!srpc_event_pending(rpc)) {
1227                         srpc_client_rpc_done(rpc, -EINTR);
1228                         return 1;
1229                 }
1230         }
1231         return 0;
1232 }
1233
1234 srpc_client_rpc_t *
1235 srpc_create_client_rpc (lnet_process_id_t peer, int service,
1236                         int nbulkiov, int bulklen,
1237                         void (*rpc_done)(srpc_client_rpc_t *),
1238                         void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1239 {
1240         srpc_client_rpc_t *rpc;
1241
1242         LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1243                                    crpc_bulk.bk_iovs[nbulkiov]));
1244         if (rpc == NULL)
1245                 return NULL;
1246
1247         srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1248                              bulklen, rpc_done, rpc_fini, priv);
1249         return rpc;
1250 }
1251
1252 /* called with rpc->crpc_lock held */
1253 static inline void
1254 srpc_queue_rpc (srpc_peer_t *peer, srpc_client_rpc_t *rpc)
1255 {
1256         int service = rpc->crpc_service;
1257
1258         LASSERT (peer->stp_nid == rpc->crpc_dest.nid);
1259         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1260
1261         rpc->crpc_peer = peer;
1262
1263         spin_lock(&peer->stp_lock);
1264
1265         /* Framework RPCs that alter session state shall take precedence
1266          * over test RPCs and framework query RPCs */
1267         if (service <= SRPC_FRAMEWORK_SERVICE_MAX_ID &&
1268             service != SRPC_SERVICE_DEBUG &&
1269             service != SRPC_SERVICE_QUERY_STAT)
1270                 list_add_tail(&rpc->crpc_privl, &peer->stp_ctl_rpcq);
1271         else
1272                 list_add_tail(&rpc->crpc_privl, &peer->stp_rpcq);
1273
1274         srpc_client_rpc_addref(rpc); /* ++ref for peer->*rpcq */
1275         spin_unlock(&peer->stp_lock);
1276         return;
1277 }
1278
1279 /* called with rpc->crpc_lock held */
1280 void
1281 srpc_abort_rpc (srpc_client_rpc_t *rpc, int why)
1282 {
1283         srpc_peer_t *peer = rpc->crpc_peer;
1284
1285         LASSERT (why != 0);
1286
1287         if (rpc->crpc_aborted || /* already aborted */
1288             rpc->crpc_closed)    /* callback imminent */
1289                 return;
1290
1291         CDEBUG (D_NET,
1292                 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1293                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1294                 swi_state2str(rpc->crpc_wi.wi_state), why);
1295
1296         rpc->crpc_aborted = 1;
1297         rpc->crpc_status  = why;
1298
1299         if (peer != NULL) {
1300                 spin_lock(&peer->stp_lock);
1301
1302                 if (!list_empty(&rpc->crpc_privl)) { /* still queued */
1303                         list_del_init(&rpc->crpc_privl);
1304                         srpc_client_rpc_decref(rpc); /* --ref for peer->*rpcq */
1305                         rpc->crpc_peer = NULL;       /* no credit taken */
1306                 }
1307
1308                 spin_unlock(&peer->stp_lock);
1309         }
1310
1311         swi_schedule_workitem(&rpc->crpc_wi);
1312         return;
1313 }
1314
1315 /* called with rpc->crpc_lock held */
1316 void
1317 srpc_post_rpc (srpc_client_rpc_t *rpc)
1318 {
1319         srpc_peer_t *peer;
1320
1321         LASSERT (!rpc->crpc_aborted);
1322         LASSERT (rpc->crpc_peer == NULL);
1323         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1324         LASSERT ((rpc->crpc_bulk.bk_len & ~CFS_PAGE_MASK) == 0);
1325
1326         CDEBUG (D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1327                 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1328                 rpc->crpc_timeout);
1329
1330         srpc_add_client_rpc_timer(rpc);
1331
1332         peer = srpc_nid2peer(rpc->crpc_dest.nid);
1333         if (peer == NULL) {
1334                 srpc_abort_rpc(rpc, -ENOMEM);
1335                 return;
1336         }
1337
1338         srpc_queue_rpc(peer, rpc);
1339
1340         spin_unlock(&rpc->crpc_lock);
1341         srpc_check_sends(peer, 0);
1342         spin_lock(&rpc->crpc_lock);
1343         return;
1344 }
1345
1346
1347 int
1348 srpc_send_reply (srpc_server_rpc_t *rpc)
1349 {
1350         srpc_event_t   *ev = &rpc->srpc_ev;
1351         srpc_msg_t     *msg = &rpc->srpc_replymsg;
1352         srpc_buffer_t  *buffer = rpc->srpc_reqstbuf;
1353         srpc_service_t *sv = rpc->srpc_service;
1354         __u64           rpyid;
1355         int             rc;
1356
1357         LASSERT (buffer != NULL);
1358         rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1359
1360         spin_lock(&sv->sv_lock);
1361
1362         if (!sv->sv_shuttingdown &&
1363             sv->sv_id > SRPC_FRAMEWORK_SERVICE_MAX_ID) {
1364                 /* Repost buffer before replying since test client
1365                  * might send me another RPC once it gets the reply */
1366                 if (srpc_service_post_buffer(sv, buffer) != 0)
1367                         CWARN ("Failed to repost %s buffer\n", sv->sv_name);
1368                 rpc->srpc_reqstbuf = NULL;
1369         }
1370
1371         spin_unlock(&sv->sv_lock);
1372
1373         ev->ev_fired = 0;
1374         ev->ev_data  = rpc;
1375         ev->ev_type  = SRPC_REPLY_SENT;
1376
1377         msg->msg_magic   = SRPC_MSG_MAGIC;
1378         msg->msg_version = SRPC_MSG_VERSION;
1379         msg->msg_type    = srpc_service2reply(sv->sv_id);
1380
1381         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1382                                    sizeof(*msg), LNET_MD_OP_PUT,
1383                                    rpc->srpc_peer, rpc->srpc_self,
1384                                    &rpc->srpc_replymdh, ev);
1385         if (rc != 0)
1386                 ev->ev_fired = 1;  /* no more event expected */
1387         return rc;
1388 }
1389
1390 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1391 void
1392 srpc_lnet_ev_handler (lnet_event_t *ev)
1393 {
1394         srpc_event_t      *rpcev = ev->md.user_ptr;
1395         srpc_client_rpc_t *crpc;
1396         srpc_server_rpc_t *srpc;
1397         srpc_buffer_t     *buffer;
1398         srpc_service_t    *sv;
1399         srpc_msg_t        *msg;
1400         srpc_msg_type_t    type;
1401         int                fired_flag = 1;
1402
1403         LASSERT (!in_interrupt());
1404
1405         if (ev->status != 0) {
1406                 spin_lock(&srpc_data.rpc_glock);
1407                 srpc_data.rpc_counters.errors++;
1408                 spin_unlock(&srpc_data.rpc_glock);
1409         }
1410
1411         rpcev->ev_lnet = ev->type;
1412
1413         switch (rpcev->ev_type) {
1414         default:
1415                 LBUG ();
1416         case SRPC_REQUEST_SENT:
1417                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1418                         spin_lock(&srpc_data.rpc_glock);
1419                         srpc_data.rpc_counters.rpcs_sent++;
1420                         spin_unlock(&srpc_data.rpc_glock);
1421                 }
1422         case SRPC_REPLY_RCVD:
1423         case SRPC_BULK_REQ_RCVD:
1424                 crpc = rpcev->ev_data;
1425
1426                 LASSERT (rpcev == &crpc->crpc_reqstev ||
1427                          rpcev == &crpc->crpc_replyev ||
1428                          rpcev == &crpc->crpc_bulkev);
1429
1430                 spin_lock(&crpc->crpc_lock);
1431
1432                 LASSERT (rpcev->ev_fired == 0);
1433                 rpcev->ev_fired  = 1;
1434                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1435                                                 -EINTR : ev->status;
1436                 swi_schedule_workitem(&crpc->crpc_wi);
1437
1438                 spin_unlock(&crpc->crpc_lock);
1439                 break;
1440
1441         case SRPC_REQUEST_RCVD:
1442                 sv = rpcev->ev_data;
1443
1444                 LASSERT (rpcev == &sv->sv_ev);
1445
1446                 spin_lock(&sv->sv_lock);
1447
1448                 LASSERT (ev->unlinked);
1449                 LASSERT (ev->type == LNET_EVENT_PUT ||
1450                          ev->type == LNET_EVENT_UNLINK);
1451                 LASSERT (ev->type != LNET_EVENT_UNLINK ||
1452                          sv->sv_shuttingdown);
1453
1454                 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1455                 buffer->buf_peer = ev->initiator;
1456                 buffer->buf_self = ev->target.nid;
1457
1458                 sv->sv_nposted_msg--;
1459                 LASSERT (sv->sv_nposted_msg >= 0);
1460
1461                 if (sv->sv_shuttingdown) {
1462                         /* Leave buffer on sv->sv_posted_msgq since
1463                          * srpc_finish_service needs to traverse it. */
1464                         spin_unlock(&sv->sv_lock);
1465                         break;
1466                 }
1467
1468                 list_del(&buffer->buf_list); /* from sv->sv_posted_msgq */
1469                 msg = &buffer->buf_msg;
1470                 type = srpc_service2request(sv->sv_id);
1471
1472                 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1473                     (msg->msg_type != type &&
1474                      msg->msg_type != __swab32(type)) ||
1475                     (msg->msg_magic != SRPC_MSG_MAGIC &&
1476                      msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1477                         CERROR ("Dropping RPC (%s) from %s: "
1478                                 "status %d mlength %d type %u magic %u.\n",
1479                                 sv->sv_name, libcfs_id2str(ev->initiator),
1480                                 ev->status, ev->mlength,
1481                                 msg->msg_type, msg->msg_magic);
1482
1483                         /* NB might drop sv_lock in srpc_service_recycle_buffer,
1484                          * sv_nposted_msg++ as an implicit reference to prevent
1485                          * sv from disappearing under me */
1486                         sv->sv_nposted_msg++;
1487                         srpc_service_recycle_buffer(sv, buffer);
1488                         sv->sv_nposted_msg--;
1489                         spin_unlock(&sv->sv_lock);
1490
1491                         if (ev->status == 0) { /* status!=0 counted already */
1492                                 spin_lock(&srpc_data.rpc_glock);
1493                                 srpc_data.rpc_counters.errors++;
1494                                 spin_unlock(&srpc_data.rpc_glock);
1495                         }
1496                         break;
1497                 }
1498
1499                 if (!list_empty(&sv->sv_free_rpcq)) {
1500                         srpc = list_entry(sv->sv_free_rpcq.next,
1501                                           srpc_server_rpc_t, srpc_list);
1502                         list_del(&srpc->srpc_list);
1503
1504                         srpc_init_server_rpc(srpc, sv, buffer);
1505                         list_add_tail(&srpc->srpc_list, &sv->sv_active_rpcq);
1506                         srpc_schedule_server_rpc(srpc);
1507                 } else {
1508                         list_add_tail(&buffer->buf_list, &sv->sv_blocked_msgq);
1509                 }
1510
1511                 spin_unlock(&sv->sv_lock);
1512
1513                 spin_lock(&srpc_data.rpc_glock);
1514                 srpc_data.rpc_counters.rpcs_rcvd++;
1515                 spin_unlock(&srpc_data.rpc_glock);
1516                 break;
1517
1518         case SRPC_BULK_GET_RPLD:
1519                 LASSERT (ev->type == LNET_EVENT_SEND ||
1520                          ev->type == LNET_EVENT_REPLY ||
1521                          ev->type == LNET_EVENT_UNLINK);
1522
1523                 if (ev->type == LNET_EVENT_SEND && !ev->unlinked) {
1524                         if (ev->status == 0)
1525                                 break; /* wait for the final LNET_EVENT_REPLY */
1526                         else
1527                                 fired_flag = 0; /* LNET_EVENT_REPLY may arrive
1528                                                    (optimized GET case) */
1529                 }
1530         case SRPC_BULK_PUT_SENT:
1531                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1532                         spin_lock(&srpc_data.rpc_glock);
1533
1534                         if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1535                                 srpc_data.rpc_counters.bulk_get += ev->mlength;
1536                         else
1537                                 srpc_data.rpc_counters.bulk_put += ev->mlength;
1538
1539                         spin_unlock(&srpc_data.rpc_glock);
1540                 }
1541         case SRPC_REPLY_SENT:
1542                 srpc = rpcev->ev_data;
1543                 sv = srpc->srpc_service;
1544
1545                 LASSERT (rpcev == &srpc->srpc_ev);
1546
1547                 spin_lock(&sv->sv_lock);
1548                 if (fired_flag)
1549                         rpcev->ev_fired  = 1;
1550
1551                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1552                                                 -EINTR : ev->status;
1553
1554                 srpc_schedule_server_rpc(srpc);
1555                 spin_unlock(&sv->sv_lock);
1556                 break;
1557         }
1558
1559         return;
1560 }
1561
1562 #ifndef __KERNEL__
1563
1564 int
1565 srpc_check_event (int timeout)
1566 {
1567         lnet_event_t ev;
1568         int          rc;
1569         int          i;
1570
1571         rc = LNetEQPoll(&srpc_data.rpc_lnet_eq, 1,
1572                         timeout * 1000, &ev, &i);
1573         if (rc == 0) return 0;
1574
1575         LASSERT (rc == -EOVERFLOW || rc == 1);
1576
1577         /* We can't affort to miss any events... */
1578         if (rc == -EOVERFLOW) {
1579                 CERROR ("Dropped an event!!!\n");
1580                 abort();
1581         }
1582
1583         srpc_lnet_ev_handler(&ev);
1584         return 1;
1585 }
1586
1587 #endif
1588
1589 int
1590 srpc_startup (void)
1591 {
1592         int i;
1593         int rc;
1594
1595 #ifndef __KERNEL__
1596         char *s;
1597
1598         s = getenv("SRPC_PEER_CREDITS");
1599         srpc_peer_credits = (s != NULL) ? atoi(s) : srpc_peer_credits;
1600 #endif
1601
1602         if (srpc_peer_credits <= 0) {
1603                 CERROR("Peer credits must be positive: %d\n", srpc_peer_credits);
1604                 return -EINVAL;
1605         }
1606
1607         memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1608         spin_lock_init(&srpc_data.rpc_glock);
1609
1610         /* 1 second pause to avoid timestamp reuse */
1611         cfs_pause(cfs_time_seconds(1));
1612         srpc_data.rpc_matchbits = ((__u64) cfs_time_current_sec()) << 48;
1613
1614         srpc_data.rpc_state = SRPC_STATE_NONE;
1615
1616         LIBCFS_ALLOC(srpc_data.rpc_peers,
1617                      sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1618         if (srpc_data.rpc_peers == NULL) {
1619                 CERROR ("Failed to alloc peer hash.\n");
1620                 return -ENOMEM;
1621         }
1622
1623         for (i = 0; i < SRPC_PEER_HASH_SIZE; i++)
1624                 CFS_INIT_LIST_HEAD(&srpc_data.rpc_peers[i]);
1625
1626 #ifdef __KERNEL__
1627         rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1628 #else
1629         if (the_lnet.ln_server_mode_flag)
1630                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1631         else
1632                 rc = LNetNIInit(getpid() | LNET_PID_USERFLAG);
1633 #endif
1634         if (rc < 0) {
1635                 CERROR ("LNetNIInit() has failed: %d\n", rc);
1636                 LIBCFS_FREE(srpc_data.rpc_peers,
1637                             sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1638                 return rc;
1639         }
1640
1641         srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1642
1643         srpc_data.rpc_lnet_eq = LNET_EQ_NONE;
1644 #ifdef __KERNEL__
1645         rc = LNetEQAlloc(16, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1646 #else
1647         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &srpc_data.rpc_lnet_eq);
1648 #endif
1649         if (rc != 0) {
1650                 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1651                 goto bail;
1652         }
1653
1654         rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1655         LASSERT (rc == 0);
1656
1657         srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1658
1659         rc = swi_startup();
1660         if (rc != 0)
1661                 goto bail;
1662
1663         srpc_data.rpc_state = SRPC_STATE_WI_INIT;
1664
1665         rc = stt_startup();
1666
1667 bail:
1668         if (rc != 0)
1669                 srpc_shutdown();
1670         else
1671                 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1672
1673         return rc;
1674 }
1675
1676 void
1677 srpc_shutdown (void)
1678 {
1679         int i;
1680         int rc;
1681         int state;
1682
1683         state = srpc_data.rpc_state;
1684         srpc_data.rpc_state = SRPC_STATE_STOPPING;
1685
1686         switch (state) {
1687         default:
1688                 LBUG ();
1689         case SRPC_STATE_RUNNING:
1690                 spin_lock(&srpc_data.rpc_glock);
1691
1692                 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1693                         srpc_service_t *sv = srpc_data.rpc_services[i];
1694
1695                         LASSERTF (sv == NULL,
1696                                   "service not empty: id %d, name %s\n",
1697                                   i, sv->sv_name);
1698                 }
1699
1700                 spin_unlock(&srpc_data.rpc_glock);
1701
1702                 stt_shutdown();
1703
1704         case SRPC_STATE_WI_INIT:
1705                 swi_shutdown();
1706
1707         case SRPC_STATE_EQ_INIT:
1708                 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1709                 LASSERT (rc == 0);
1710                 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1711                 LASSERT (rc == 0); /* the EQ should have no user by now */
1712
1713         case SRPC_STATE_NI_INIT:
1714                 LNetNIFini();
1715                 break;
1716         }
1717
1718         /* srpc_peer_t's are kept in hash until shutdown */
1719         for (i = 0; i < SRPC_PEER_HASH_SIZE; i++) {
1720                 srpc_peer_t *peer;
1721
1722                 while (!list_empty(&srpc_data.rpc_peers[i])) {
1723                         peer = list_entry(srpc_data.rpc_peers[i].next,
1724                                           srpc_peer_t, stp_list);
1725                         list_del(&peer->stp_list);
1726
1727                         LASSERT (list_empty(&peer->stp_rpcq));
1728                         LASSERT (list_empty(&peer->stp_ctl_rpcq));
1729                         LASSERT (peer->stp_credits == srpc_peer_credits);
1730
1731                         LIBCFS_FREE(peer, sizeof(srpc_peer_t));
1732                 }
1733         }
1734
1735         LIBCFS_FREE(srpc_data.rpc_peers,
1736                     sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1737         return;
1738 }