lnet/selftest/rpc.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see [sun.com URL with a
  20  * copy of GPLv2].
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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/selftest/rpc.c
  37  *
  38  * Author: Isaac Huang <isaac@clusterfs.com>
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_LNET
  42
  43 #include "selftest.h"
  44
  45
  46 #define SRPC_PEER_HASH_SIZE       101  /* # peer lists */
  47
  48 typedef enum {
  49         SRPC_STATE_NONE,
  50         SRPC_STATE_NI_INIT,
  51         SRPC_STATE_EQ_INIT,
  52         SRPC_STATE_WI_INIT,
  53         SRPC_STATE_RUNNING,
  54         SRPC_STATE_STOPPING,
  55 } srpc_state_t;
  56
  57 struct smoketest_rpc {
  58         spinlock_t        rpc_glock;     /* global lock */
  59         srpc_service_t   *rpc_services[SRPC_SERVICE_MAX_ID + 1];
  60         struct list_head *rpc_peers;     /* hash table of known peers */
  61         lnet_handle_eq_t  rpc_lnet_eq;   /* _the_ LNet event queue */
  62         srpc_state_t      rpc_state;
  63         srpc_counters_t   rpc_counters;
  64         __u64             rpc_matchbits; /* matchbits counter */
  65 } srpc_data;
  66
  67 static int srpc_peer_credits = 16;
  68 CFS_MODULE_PARM(srpc_peer_credits, "i", int, 0444,
  69                 "# in-flight RPCs per peer (16 by default)");
  70
  71 /* forward ref's */
  72 int srpc_handle_rpc (swi_workitem_t *wi);
  73
  74 void srpc_get_counters (srpc_counters_t *cnt)
  75 {
  76         spin_lock(&srpc_data.rpc_glock);
  77         *cnt = srpc_data.rpc_counters;
  78         spin_unlock(&srpc_data.rpc_glock);
  79 }
  80
  81 void srpc_set_counters (const srpc_counters_t *cnt)
  82 {
  83         spin_lock(&srpc_data.rpc_glock);
  84         srpc_data.rpc_counters = *cnt;
  85         spin_unlock(&srpc_data.rpc_glock);
  86 }
  87
  88 void
  89 srpc_add_bulk_page (srpc_bulk_t *bk, cfs_page_t *pg, int i)
  90 {
  91         LASSERT (i >= 0 && i < bk->bk_niov);
  92
  93 #ifdef __KERNEL__
  94         bk->bk_iovs[i].kiov_offset = 0;
  95         bk->bk_iovs[i].kiov_page   = pg;
  96         bk->bk_iovs[i].kiov_len    = CFS_PAGE_SIZE;
  97 #else
  98         LASSERT (bk->bk_pages != NULL);
  99
 100         bk->bk_pages[i] = pg;
 101         bk->bk_iovs[i].iov_len  = CFS_PAGE_SIZE;
 102         bk->bk_iovs[i].iov_base = cfs_page_address(pg);
 103 #endif
 104         return;
 105 }
 106
 107 void
 108 srpc_free_bulk (srpc_bulk_t *bk)
 109 {
 110         int         i;
 111         cfs_page_t *pg;
 112
 113         LASSERT (bk != NULL);
 114 #ifndef __KERNEL__
 115         LASSERT (bk->bk_pages != NULL);
 116 #endif
 117
 118         for (i = 0; i < bk->bk_niov; i++) {
 119 #ifdef __KERNEL__
 120                 pg = bk->bk_iovs[i].kiov_page;
 121 #else
 122                 pg = bk->bk_pages[i];
 123 #endif
 124                 if (pg == NULL) break;
 125
 126                 cfs_free_page(pg);
 127         }
 128
 129 #ifndef __KERNEL__
 130         LIBCFS_FREE(bk->bk_pages, sizeof(cfs_page_t *) * bk->bk_niov);
 131 #endif
 132         LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
 133         return;
 134 }
 135
 136 srpc_bulk_t *
 137 srpc_alloc_bulk (int npages, int sink)
 138 {
 139         srpc_bulk_t  *bk;
 140         cfs_page_t  **pages;
 141         int           i;
 142
 143         LASSERT (npages > 0 && npages <= LNET_MAX_IOV);
 144
 145         LIBCFS_ALLOC(bk, offsetof(srpc_bulk_t, bk_iovs[npages]));
 146         if (bk == NULL) {
 147                 CERROR ("Can't allocate descriptor for %d pages\n", npages);
 148                 return NULL;
 149         }
 150
 151         memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[npages]));
 152         bk->bk_sink = sink;
 153         bk->bk_niov = npages;
 154         bk->bk_len  = npages * CFS_PAGE_SIZE;
 155 #ifndef __KERNEL__
 156         LIBCFS_ALLOC(pages, sizeof(cfs_page_t *) * npages);
 157         if (pages == NULL) {
 158                 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[npages]));
 159                 CERROR ("Can't allocate page array for %d pages\n", npages);
 160                 return NULL;
 161         }
 162
 163         memset(pages, 0, sizeof(cfs_page_t *) * npages);
 164         bk->bk_pages = pages;
 165 #else
 166         UNUSED (pages);
 167 #endif
 168
 169         for (i = 0; i < npages; i++) {
 170                 cfs_page_t *pg = cfs_alloc_page(CFS_ALLOC_STD);
 171
 172                 if (pg == NULL) {
 173                         CERROR ("Can't allocate page %d of %d\n", i, npages);
 174                         srpc_free_bulk(bk);
 175                         return NULL;
 176                 }
 177
 178                 srpc_add_bulk_page(bk, pg, i);
 179         }
 180
 181         return bk;
 182 }
 183
 184
 185 static inline struct list_head *
 186 srpc_nid2peerlist (lnet_nid_t nid)
 187 {
 188         unsigned int hash = ((unsigned int)nid) % SRPC_PEER_HASH_SIZE;
 189
 190         return &srpc_data.rpc_peers[hash];
 191 }
 192
 193 static inline srpc_peer_t *
 194 srpc_create_peer (lnet_nid_t nid)
 195 {
 196         srpc_peer_t *peer;
 197
 198         LASSERT (nid != LNET_NID_ANY);
 199
 200         LIBCFS_ALLOC(peer, sizeof(srpc_peer_t));
 201         if (peer == NULL) {
 202                 CERROR ("Failed to allocate peer structure for %s\n",
 203                         libcfs_nid2str(nid));
 204                 return NULL;
 205         }
 206
 207         memset(peer, 0, sizeof(srpc_peer_t));
 208         peer->stp_nid     = nid;
 209         peer->stp_credits = srpc_peer_credits;
 210
 211         spin_lock_init(&peer->stp_lock);
 212         CFS_INIT_LIST_HEAD(&peer->stp_rpcq);
 213         CFS_INIT_LIST_HEAD(&peer->stp_ctl_rpcq);
 214         return peer;
 215 }
 216
 217 srpc_peer_t *
 218 srpc_find_peer_locked (lnet_nid_t nid)
 219 {
 220         struct list_head *peer_list = srpc_nid2peerlist(nid);
 221         srpc_peer_t      *peer;
 222
 223         LASSERT (nid != LNET_NID_ANY);
 224
 225         list_for_each_entry (peer, peer_list, stp_list) {
 226                 if (peer->stp_nid == nid)
 227                         return peer;
 228         }
 229
 230         return NULL;
 231 }
 232
 233 static srpc_peer_t *
 234 srpc_nid2peer (lnet_nid_t nid)
 235 {
 236         srpc_peer_t *peer;
 237         srpc_peer_t *new_peer;
 238
 239         spin_lock(&srpc_data.rpc_glock);
 240         peer = srpc_find_peer_locked(nid);
 241         spin_unlock(&srpc_data.rpc_glock);
 242
 243         if (peer != NULL)
 244                 return peer;
 245
 246         new_peer = srpc_create_peer(nid);
 247
 248         spin_lock(&srpc_data.rpc_glock);
 249
 250         peer = srpc_find_peer_locked(nid);
 251         if (peer != NULL) {
 252                 spin_unlock(&srpc_data.rpc_glock);
 253                 if (new_peer != NULL)
 254                         LIBCFS_FREE(new_peer, sizeof(srpc_peer_t));
 255
 256                 return peer;
 257         }
 258
 259         if (new_peer == NULL) {
 260                 spin_unlock(&srpc_data.rpc_glock);
 261                 return NULL;
 262         }
 263
 264         list_add_tail(&new_peer->stp_list, srpc_nid2peerlist(nid));
 265         spin_unlock(&srpc_data.rpc_glock);
 266         return new_peer;
 267 }
 268
 269 static inline __u64
 270 srpc_next_id (void)
 271 {
 272         __u64 id;
 273
 274         spin_lock(&srpc_data.rpc_glock);
 275         id = srpc_data.rpc_matchbits++;
 276         spin_unlock(&srpc_data.rpc_glock);
 277         return id;
 278 }
 279
 280 void
 281 srpc_init_server_rpc (srpc_server_rpc_t *rpc,
 282                       srpc_service_t *sv, srpc_buffer_t *buffer)
 283 {
 284         memset(rpc, 0, sizeof(*rpc));
 285         swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc);
 286
 287         rpc->srpc_ev.ev_fired = 1; /* no event expected now */
 288
 289         rpc->srpc_service  = sv;
 290         rpc->srpc_reqstbuf = buffer;
 291         rpc->srpc_peer     = buffer->buf_peer;
 292         rpc->srpc_self     = buffer->buf_self;
 293         rpc->srpc_replymdh = LNET_INVALID_HANDLE;
 294 }
 295
 296 int
 297 srpc_add_service (srpc_service_t *sv)
 298 {
 299         int                id = sv->sv_id;
 300         int                i;
 301         srpc_server_rpc_t *rpc;
 302
 303         LASSERT (sv->sv_concur > 0);
 304         LASSERT (0 <= id && id <= SRPC_SERVICE_MAX_ID);
 305
 306         spin_lock(&srpc_data.rpc_glock);
 307
 308         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
 309
 310         if (srpc_data.rpc_services[id] != NULL) {
 311                 spin_unlock(&srpc_data.rpc_glock);
 312                 return -EBUSY;
 313         }
 314
 315         srpc_data.rpc_services[id] = sv;
 316         spin_unlock(&srpc_data.rpc_glock);
 317
 318         sv->sv_nprune       = 0;
 319         sv->sv_nposted_msg  = 0;
 320         sv->sv_shuttingdown = 0;
 321         spin_lock_init(&sv->sv_lock);
 322         CFS_INIT_LIST_HEAD(&sv->sv_free_rpcq);
 323         CFS_INIT_LIST_HEAD(&sv->sv_active_rpcq);
 324         CFS_INIT_LIST_HEAD(&sv->sv_posted_msgq);
 325         CFS_INIT_LIST_HEAD(&sv->sv_blocked_msgq);
 326
 327         sv->sv_ev.ev_data = sv;
 328         sv->sv_ev.ev_type = SRPC_REQUEST_RCVD;
 329
 330         for (i = 0; i < sv->sv_concur; i++) {
 331                 LIBCFS_ALLOC(rpc, sizeof(*rpc));
 332                 if (rpc == NULL) goto enomem;
 333
 334                 list_add(&rpc->srpc_list, &sv->sv_free_rpcq);
 335         }
 336
 337         CDEBUG (D_NET, "Adding service: id %d, name %s, concurrency %d\n",
 338                 id, sv->sv_name, sv->sv_concur);
 339         return 0;
 340
 341 enomem:
 342         while (!list_empty(&sv->sv_free_rpcq)) {
 343                 rpc = list_entry(sv->sv_free_rpcq.next,
 344                                  srpc_server_rpc_t, srpc_list);
 345                 list_del(&rpc->srpc_list);
 346                 LIBCFS_FREE(rpc, sizeof(*rpc));
 347         }
 348
 349         spin_lock(&srpc_data.rpc_glock);
 350         srpc_data.rpc_services[id] = NULL;
 351         spin_unlock(&srpc_data.rpc_glock);
 352         return -ENOMEM;
 353 }
 354
 355 int
 356 srpc_remove_service (srpc_service_t *sv)
 357 {
 358         int id = sv->sv_id;
 359
 360         spin_lock(&srpc_data.rpc_glock);
 361
 362         if (srpc_data.rpc_services[id] != sv) {
 363                 spin_unlock(&srpc_data.rpc_glock);
 364                 return -ENOENT;
 365         }
 366
 367         srpc_data.rpc_services[id] = NULL;
 368         spin_unlock(&srpc_data.rpc_glock);
 369         return 0;
 370 }
 371
 372 int
 373 srpc_post_passive_rdma(int portal, __u64 matchbits, void *buf,
 374                        int len, int options, lnet_process_id_t peer,
 375                        lnet_handle_md_t *mdh, srpc_event_t *ev)
 376 {
 377         int              rc;
 378         lnet_md_t        md;
 379         lnet_handle_me_t meh;
 380
 381         rc = LNetMEAttach(portal, peer, matchbits, 0,
 382                           LNET_UNLINK, LNET_INS_AFTER, &meh);
 383         if (rc != 0) {
 384                 CERROR ("LNetMEAttach failed: %d\n", rc);
 385                 LASSERT (rc == -ENOMEM);
 386                 return -ENOMEM;
 387         }
 388
 389         md.threshold = 1;
 390         md.user_ptr  = ev;
 391         md.start     = buf;
 392         md.length    = len;
 393         md.options   = options;
 394         md.eq_handle = srpc_data.rpc_lnet_eq;
 395
 396         rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
 397         if (rc != 0) {
 398                 CERROR ("LNetMDAttach failed: %d\n", rc);
 399                 LASSERT (rc == -ENOMEM);
 400
 401                 rc = LNetMEUnlink(meh);
 402                 LASSERT (rc == 0);
 403                 return -ENOMEM;
 404         }
 405
 406         CDEBUG (D_NET,
 407                 "Posted passive RDMA: peer %s, portal %d, matchbits "LPX64"\n",
 408                 libcfs_id2str(peer), portal, matchbits);
 409         return 0;
 410 }
 411
 412 int
 413 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
 414                       int options, lnet_process_id_t peer, lnet_nid_t self,
 415                       lnet_handle_md_t *mdh, srpc_event_t *ev)
 416 {
 417         int       rc;
 418         lnet_md_t md;
 419
 420         md.user_ptr  = ev;
 421         md.start     = buf;
 422         md.length    = len;
 423         md.eq_handle = srpc_data.rpc_lnet_eq;
 424         md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
 425         md.options   = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
 426
 427         rc = LNetMDBind(md, LNET_UNLINK, mdh);
 428         if (rc != 0) {
 429                 CERROR ("LNetMDBind failed: %d\n", rc);
 430                 LASSERT (rc == -ENOMEM);
 431                 return -ENOMEM;
 432         }
 433
 434         /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
 435          * they're only meaningful for MDs attached to an ME (i.e. passive
 436          * buffers... */
 437         if ((options & LNET_MD_OP_PUT) != 0) {
 438                 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
 439                              portal, matchbits, 0, 0);
 440         } else {
 441                 LASSERT ((options & LNET_MD_OP_GET) != 0);
 442
 443                 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
 444         }
 445
 446         if (rc != 0) {
 447                 CERROR ("LNet%s(%s, %d, "LPD64") failed: %d\n",
 448                         ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
 449                         libcfs_id2str(peer), portal, matchbits, rc);
 450
 451                 /* The forthcoming unlink event will complete this operation
 452                  * with failure, so fall through and return success here.
 453                  */
 454                 rc = LNetMDUnlink(*mdh);
 455                 LASSERT (rc == 0);
 456         } else {
 457                 CDEBUG (D_NET,
 458                         "Posted active RDMA: peer %s, portal %u, matchbits "LPX64"\n",
 459                         libcfs_id2str(peer), portal, matchbits);
 460         }
 461         return 0;
 462 }
 463
 464 int
 465 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
 466                         int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
 467 {
 468         int rc;
 469         int portal;
 470
 471         if (service > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 472                 portal = SRPC_REQUEST_PORTAL;
 473         else
 474                 portal = SRPC_FRAMEWORK_REQUEST_PORTAL;
 475
 476         rc = srpc_post_active_rdma(portal, service, buf, len,
 477                                    LNET_MD_OP_PUT, peer,
 478                                    LNET_NID_ANY, mdh, ev);
 479         return rc;
 480 }
 481
 482 int
 483 srpc_post_passive_rqtbuf(int service, void *buf, int len,
 484                          lnet_handle_md_t *mdh, srpc_event_t *ev)
 485 {
 486         int               rc;
 487         int               portal;
 488         lnet_process_id_t any = {.nid = LNET_NID_ANY,
 489                                  .pid = LNET_PID_ANY};
 490
 491         if (service > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 492                 portal = SRPC_REQUEST_PORTAL;
 493         else
 494                 portal = SRPC_FRAMEWORK_REQUEST_PORTAL;
 495
 496         rc = srpc_post_passive_rdma(portal, service, buf, len,
 497                                     LNET_MD_OP_PUT, any, mdh, ev);
 498         return rc;
 499 }
 500
 501 int
 502 srpc_service_post_buffer (srpc_service_t *sv, srpc_buffer_t *buf)
 503 {
 504         srpc_msg_t *msg = &buf->buf_msg;
 505         int         rc;
 506
 507         LASSERT (!sv->sv_shuttingdown);
 508
 509         buf->buf_mdh = LNET_INVALID_HANDLE;
 510         list_add(&buf->buf_list, &sv->sv_posted_msgq);
 511         sv->sv_nposted_msg++;
 512         spin_unlock(&sv->sv_lock);
 513
 514         rc = srpc_post_passive_rqtbuf(sv->sv_id, msg, sizeof(*msg),
 515                                       &buf->buf_mdh, &sv->sv_ev);
 516
 517         /* At this point, a RPC (new or delayed) may have arrived in
 518          * msg and its event handler has been called. So we must add
 519          * buf to sv_posted_msgq _before_ dropping sv_lock */
 520
 521         spin_lock(&sv->sv_lock);
 522
 523         if (rc == 0) {
 524                 if (sv->sv_shuttingdown) {
 525                         spin_unlock(&sv->sv_lock);
 526
 527                         /* srpc_shutdown_service might have tried to unlink me
 528                          * when my buf_mdh was still invalid */
 529                         LNetMDUnlink(buf->buf_mdh);
 530
 531                         spin_lock(&sv->sv_lock);
 532                 }
 533                 return 0;
 534         }
 535
 536         sv->sv_nposted_msg--;
 537         if (sv->sv_shuttingdown) return rc;
 538
 539         list_del(&buf->buf_list);
 540
 541         spin_unlock(&sv->sv_lock);
 542         LIBCFS_FREE(buf, sizeof(*buf));
 543         spin_lock(&sv->sv_lock);
 544         return rc;
 545 }
 546
 547 int
 548 srpc_service_add_buffers (srpc_service_t *sv, int nbuffer)
 549 {
 550         int                rc;
 551         int                posted;
 552         srpc_buffer_t     *buf;
 553
 554         LASSERTF (nbuffer > 0,
 555                   "nbuffer must be positive: %d\n", nbuffer);
 556
 557         for (posted = 0; posted < nbuffer; posted++) {
 558                 LIBCFS_ALLOC(buf, sizeof(*buf));
 559                 if (buf == NULL) break;
 560
 561                 spin_lock(&sv->sv_lock);
 562                 rc = srpc_service_post_buffer(sv, buf);
 563                 spin_unlock(&sv->sv_lock);
 564
 565                 if (rc != 0) break;
 566         }
 567
 568         return posted;
 569 }
 570
 571 void
 572 srpc_service_remove_buffers (srpc_service_t *sv, int nbuffer)
 573 {
 574         LASSERTF (nbuffer > 0,
 575                   "nbuffer must be positive: %d\n", nbuffer);
 576
 577         spin_lock(&sv->sv_lock);
 578
 579         LASSERT (sv->sv_nprune >= 0);
 580         LASSERT (!sv->sv_shuttingdown);
 581
 582         sv->sv_nprune += nbuffer;
 583
 584         spin_unlock(&sv->sv_lock);
 585         return;
 586 }
 587
 588 /* returns 1 if sv has finished, otherwise 0 */
 589 int
 590 srpc_finish_service (srpc_service_t *sv)
 591 {
 592         srpc_server_rpc_t *rpc;
 593         srpc_buffer_t     *buf;
 594
 595         spin_lock(&sv->sv_lock);
 596
 597         LASSERT (sv->sv_shuttingdown); /* srpc_shutdown_service called */
 598
 599         if (sv->sv_nposted_msg != 0 || !list_empty(&sv->sv_active_rpcq)) {
 600                 CDEBUG (D_NET,
 601                         "waiting for %d posted buffers to unlink and "
 602                         "in-flight RPCs to die.\n",
 603                         sv->sv_nposted_msg);
 604
 605                 if (!list_empty(&sv->sv_active_rpcq)) {
 606                         rpc = list_entry(sv->sv_active_rpcq.next,
 607                                          srpc_server_rpc_t, srpc_list);
 608                         CDEBUG (D_NETERROR,
 609                                 "Active RPC on shutdown: sv %s, peer %s, "
 610                                 "wi %s scheduled %d running %d, "
 611                                 "ev fired %d type %d status %d lnet %d\n",
 612                                 sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 613                                 swi_state2str(rpc->srpc_wi.wi_state),
 614                                 rpc->srpc_wi.wi_scheduled,
 615                                 rpc->srpc_wi.wi_running,
 616                                 rpc->srpc_ev.ev_fired,
 617                                 rpc->srpc_ev.ev_type,
 618                                 rpc->srpc_ev.ev_status,
 619                                 rpc->srpc_ev.ev_lnet);
 620                 }
 621
 622                 spin_unlock(&sv->sv_lock);
 623                 return 0;
 624         }
 625
 626         spin_unlock(&sv->sv_lock); /* no lock needed from now on */
 627
 628         for (;;) {
 629                 struct list_head *q;
 630
 631                 if (!list_empty(&sv->sv_posted_msgq))
 632                         q = &sv->sv_posted_msgq;
 633                 else if (!list_empty(&sv->sv_blocked_msgq))
 634                         q = &sv->sv_blocked_msgq;
 635                 else
 636                         break;
 637
 638                 buf = list_entry(q->next, srpc_buffer_t, buf_list);
 639                 list_del(&buf->buf_list);
 640
 641                 LIBCFS_FREE(buf, sizeof(*buf));
 642         }
 643
 644         while (!list_empty(&sv->sv_free_rpcq)) {
 645                 rpc = list_entry(sv->sv_free_rpcq.next,
 646                                  srpc_server_rpc_t, srpc_list);
 647                 list_del(&rpc->srpc_list);
 648                 LIBCFS_FREE(rpc, sizeof(*rpc));
 649         }
 650
 651         return 1;
 652 }
 653
 654 /* called with sv->sv_lock held */
 655 void
 656 srpc_service_recycle_buffer (srpc_service_t *sv, srpc_buffer_t *buf)
 657 {
 658         if (sv->sv_shuttingdown) goto free;
 659
 660         if (sv->sv_nprune == 0) {
 661                 if (srpc_service_post_buffer(sv, buf) != 0)
 662                         CWARN ("Failed to post %s buffer\n", sv->sv_name);
 663                 return;
 664         }
 665
 666         sv->sv_nprune--;
 667 free:
 668         spin_unlock(&sv->sv_lock);
 669         LIBCFS_FREE(buf, sizeof(*buf));
 670         spin_lock(&sv->sv_lock);
 671 }
 672
 673 void
 674 srpc_shutdown_service (srpc_service_t *sv)
 675 {
 676         srpc_server_rpc_t *rpc;
 677         srpc_buffer_t     *buf;
 678
 679         spin_lock(&sv->sv_lock);
 680
 681         CDEBUG (D_NET, "Shutting down service: id %d, name %s\n",
 682                 sv->sv_id, sv->sv_name);
 683
 684         sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
 685
 686         /* schedule in-flight RPCs to notice the shutdown */
 687         list_for_each_entry (rpc, &sv->sv_active_rpcq, srpc_list) {
 688                 swi_schedule_workitem(&rpc->srpc_wi);
 689         }
 690
 691         spin_unlock(&sv->sv_lock);
 692
 693         /* OK to traverse sv_posted_msgq without lock, since no one
 694          * touches sv_posted_msgq now */
 695         list_for_each_entry (buf, &sv->sv_posted_msgq, buf_list)
 696                 LNetMDUnlink(buf->buf_mdh);
 697
 698         return;
 699 }
 700
 701 int
 702 srpc_send_request (srpc_client_rpc_t *rpc)
 703 {
 704         srpc_event_t *ev = &rpc->crpc_reqstev;
 705         int           rc;
 706
 707         ev->ev_fired = 0;
 708         ev->ev_data  = rpc;
 709         ev->ev_type  = SRPC_REQUEST_SENT;
 710
 711         rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
 712                                      &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
 713                                      &rpc->crpc_reqstmdh, ev);
 714         if (rc != 0) {
 715                 LASSERT (rc == -ENOMEM);
 716                 ev->ev_fired = 1;  /* no more event expected */
 717         }
 718         return rc;
 719 }
 720
 721 int
 722 srpc_prepare_reply (srpc_client_rpc_t *rpc)
 723 {
 724         srpc_event_t *ev = &rpc->crpc_replyev;
 725         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
 726         int           rc;
 727
 728         ev->ev_fired = 0;
 729         ev->ev_data  = rpc;
 730         ev->ev_type  = SRPC_REPLY_RCVD;
 731
 732         *id = srpc_next_id();
 733
 734         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, *id,
 735                                     &rpc->crpc_replymsg, sizeof(srpc_msg_t),
 736                                     LNET_MD_OP_PUT, rpc->crpc_dest,
 737                                     &rpc->crpc_replymdh, ev);
 738         if (rc != 0) {
 739                 LASSERT (rc == -ENOMEM);
 740                 ev->ev_fired = 1;  /* no more event expected */
 741         }
 742         return rc;
 743 }
 744
 745 int
 746 srpc_prepare_bulk (srpc_client_rpc_t *rpc)
 747 {
 748         srpc_bulk_t  *bk = &rpc->crpc_bulk;
 749         srpc_event_t *ev = &rpc->crpc_bulkev;
 750         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
 751         int           rc;
 752         int           opt;
 753
 754         LASSERT (bk->bk_niov <= LNET_MAX_IOV);
 755
 756         if (bk->bk_niov == 0) return 0; /* nothing to do */
 757
 758         opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
 759 #ifdef __KERNEL__
 760         opt |= LNET_MD_KIOV;
 761 #else
 762         opt |= LNET_MD_IOVEC;
 763 #endif
 764
 765         ev->ev_fired = 0;
 766         ev->ev_data  = rpc;
 767         ev->ev_type  = SRPC_BULK_REQ_RCVD;
 768
 769         *id = srpc_next_id();
 770
 771         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, *id,
 772                                     &bk->bk_iovs[0], bk->bk_niov, opt,
 773                                     rpc->crpc_dest, &bk->bk_mdh, ev);
 774         if (rc != 0) {
 775                 LASSERT (rc == -ENOMEM);
 776                 ev->ev_fired = 1;  /* no more event expected */
 777         }
 778         return rc;
 779 }
 780
 781 int
 782 srpc_do_bulk (srpc_server_rpc_t *rpc)
 783 {
 784         srpc_event_t  *ev = &rpc->srpc_ev;
 785         srpc_bulk_t   *bk = rpc->srpc_bulk;
 786         __u64          id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
 787         int            rc;
 788         int            opt;
 789
 790         LASSERT (bk != NULL);
 791
 792         opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
 793 #ifdef __KERNEL__
 794         opt |= LNET_MD_KIOV;
 795 #else
 796         opt |= LNET_MD_IOVEC;
 797 #endif
 798
 799         ev->ev_fired = 0;
 800         ev->ev_data  = rpc;
 801         ev->ev_type  = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
 802
 803         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
 804                                    &bk->bk_iovs[0], bk->bk_niov, opt,
 805                                    rpc->srpc_peer, rpc->srpc_self,
 806                                    &bk->bk_mdh, ev);
 807         if (rc != 0)
 808                 ev->ev_fired = 1;  /* no more event expected */
 809         return rc;
 810 }
 811
 812 /* called with srpc_service_t::sv_lock held */
 813 inline void
 814 srpc_schedule_server_rpc (srpc_server_rpc_t *rpc)
 815 {
 816         srpc_service_t *sv = rpc->srpc_service;
 817
 818         if (sv->sv_id > SRPC_FRAMEWORK_SERVICE_MAX_ID)
 819                 swi_schedule_workitem(&rpc->srpc_wi);
 820         else    /* framework RPCs are handled one by one */
 821                 swi_schedule_serial_workitem(&rpc->srpc_wi);
 822
 823         return;
 824 }
 825
 826 /* only called from srpc_handle_rpc */
 827 void
 828 srpc_server_rpc_done (srpc_server_rpc_t *rpc, int status)
 829 {
 830         srpc_service_t *sv = rpc->srpc_service;
 831         srpc_buffer_t  *buffer;
 832
 833         LASSERT (status != 0 || rpc->srpc_wi.wi_state == SWI_STATE_DONE);
 834
 835         rpc->srpc_status = status;
 836
 837         CDEBUG (status == 0 ? D_NET : D_NETERROR,
 838                 "Server RPC done: service %s, peer %s, status %s:%d\n",
 839                 sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 840                 swi_state2str(rpc->srpc_wi.wi_state), status);
 841
 842         if (status != 0) {
 843                 spin_lock(&srpc_data.rpc_glock);
 844                 srpc_data.rpc_counters.rpcs_dropped++;
 845                 spin_unlock(&srpc_data.rpc_glock);
 846         }
 847
 848         if (rpc->srpc_done != NULL)
 849                 (*rpc->srpc_done) (rpc);
 850         LASSERT (rpc->srpc_bulk == NULL);
 851
 852         spin_lock(&sv->sv_lock);
 853
 854         if (rpc->srpc_reqstbuf != NULL) {
 855                 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
 856                  * sv won't go away for sv_active_rpcq must not be empty */
 857                 srpc_service_recycle_buffer(sv, rpc->srpc_reqstbuf);
 858                 rpc->srpc_reqstbuf = NULL;
 859         }
 860
 861         list_del(&rpc->srpc_list); /* from sv->sv_active_rpcq */
 862
 863         /*
 864          * No one can schedule me now since:
 865          * - I'm not on sv_active_rpcq.
 866          * - all LNet events have been fired.
 867          * Cancel pending schedules and prevent future schedule attempts:
 868          */
 869         LASSERT (rpc->srpc_ev.ev_fired);
 870         swi_kill_workitem(&rpc->srpc_wi);
 871
 872         if (!sv->sv_shuttingdown && !list_empty(&sv->sv_blocked_msgq)) {
 873                 buffer = list_entry(sv->sv_blocked_msgq.next,
 874                                     srpc_buffer_t, buf_list);
 875                 list_del(&buffer->buf_list);
 876
 877                 srpc_init_server_rpc(rpc, sv, buffer);
 878                 list_add_tail(&rpc->srpc_list, &sv->sv_active_rpcq);
 879                 srpc_schedule_server_rpc(rpc);
 880         } else {
 881                 list_add(&rpc->srpc_list, &sv->sv_free_rpcq);
 882         }
 883
 884         spin_unlock(&sv->sv_lock);
 885         return;
 886 }
 887
 888 /* handles an incoming RPC */
 889 int
 890 srpc_handle_rpc (swi_workitem_t *wi)
 891 {
 892         srpc_server_rpc_t *rpc = wi->wi_data;
 893         srpc_service_t    *sv = rpc->srpc_service;
 894         srpc_event_t      *ev = &rpc->srpc_ev;
 895         int                rc = 0;
 896
 897         LASSERT (wi == &rpc->srpc_wi);
 898
 899         spin_lock(&sv->sv_lock);
 900
 901         if (sv->sv_shuttingdown) {
 902                 spin_unlock(&sv->sv_lock);
 903
 904                 if (rpc->srpc_bulk != NULL)
 905                         LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
 906                 LNetMDUnlink(rpc->srpc_replymdh);
 907
 908                 if (ev->ev_fired) { /* no more event, OK to finish */
 909                         srpc_server_rpc_done(rpc, -ESHUTDOWN);
 910                         return 1;
 911                 }
 912                 return 0;
 913         }
 914
 915         spin_unlock(&sv->sv_lock);
 916
 917         switch (wi->wi_state) {
 918         default:
 919                 LBUG ();
 920         case SWI_STATE_NEWBORN: {
 921                 srpc_msg_t           *msg;
 922                 srpc_generic_reply_t *reply;
 923
 924                 msg = &rpc->srpc_reqstbuf->buf_msg;
 925                 reply = &rpc->srpc_replymsg.msg_body.reply;
 926
 927                 if (msg->msg_version != SRPC_MSG_VERSION &&
 928                     msg->msg_version != __swab32(SRPC_MSG_VERSION)) {
 929                         CWARN ("Version mismatch: %u, %u expected, from %s\n",
 930                                msg->msg_version, SRPC_MSG_VERSION,
 931                                libcfs_id2str(rpc->srpc_peer));
 932                         reply->status = EPROTO;
 933                 } else {
 934                         reply->status = 0;
 935                         rc = (*sv->sv_handler) (rpc);
 936                         LASSERT (reply->status == 0 || !rpc->srpc_bulk);
 937                 }
 938
 939                 if (rc != 0) {
 940                         srpc_server_rpc_done(rpc, rc);
 941                         return 1;
 942                 }
 943
 944                 wi->wi_state = SWI_STATE_BULK_STARTED;
 945
 946                 if (rpc->srpc_bulk != NULL) {
 947                         rc = srpc_do_bulk(rpc);
 948                         if (rc == 0)
 949                                 return 0; /* wait for bulk */
 950
 951                         LASSERT (ev->ev_fired);
 952                         ev->ev_status = rc;
 953                 }
 954         }
 955         case SWI_STATE_BULK_STARTED:
 956                 /* we cannot LASSERT ev_fired right here because it
 957                  * may be set only upon an event with unlinked==1 */
 958
 959                 if (rpc->srpc_bulk != NULL) {
 960                         rc = ev->ev_status;
 961
 962                         if (sv->sv_bulk_ready != NULL)
 963                                 rc = (*sv->sv_bulk_ready) (rpc, rc);
 964
 965                         if (rc != 0) {
 966                                 if (ev->ev_fired) {
 967                                         srpc_server_rpc_done(rpc, rc);
 968                                         return 1;
 969                                 }
 970
 971                                 rpc->srpc_status = rc;
 972                                 wi->wi_state     = SWI_STATE_BULK_ERRORED;
 973                                 LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
 974                                 return 0; /* wait for UNLINK event  */
 975                         }
 976                 }
 977
 978                 LASSERT (rpc->srpc_bulk == NULL || ev->ev_fired);
 979
 980                 wi->wi_state = SWI_STATE_REPLY_SUBMITTED;
 981                 rc = srpc_send_reply(rpc);
 982                 if (rc == 0)
 983                         return 0; /* wait for reply */
 984                 srpc_server_rpc_done(rpc, rc);
 985                 return 1;
 986
 987         case SWI_STATE_REPLY_SUBMITTED:
 988                 LASSERT (ev->ev_fired);
 989
 990                 wi->wi_state = SWI_STATE_DONE;
 991                 srpc_server_rpc_done(rpc, ev->ev_status);
 992                 return 1;
 993
 994         case SWI_STATE_BULK_ERRORED:
 995                 LASSERT (rpc->srpc_bulk != NULL && ev->ev_fired);
 996                 LASSERT (rpc->srpc_status != 0);
 997
 998                 srpc_server_rpc_done(rpc, rpc->srpc_status);
 999                 return 1;
1000         }
1001
1002         return 0;
1003 }
1004
1005 void
1006 srpc_client_rpc_expired (void *data)
1007 {
1008         srpc_client_rpc_t *rpc = data;
1009
1010         CWARN ("Client RPC expired: service %d, peer %s, timeout %d.\n",
1011                rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1012                rpc->crpc_timeout);
1013
1014         spin_lock(&rpc->crpc_lock);
1015
1016         rpc->crpc_timeout = 0;
1017         srpc_abort_rpc(rpc, -ETIMEDOUT);
1018
1019         spin_unlock(&rpc->crpc_lock);
1020
1021         spin_lock(&srpc_data.rpc_glock);
1022         srpc_data.rpc_counters.rpcs_expired++;
1023         spin_unlock(&srpc_data.rpc_glock);
1024         return;
1025 }
1026
1027 inline void
1028 srpc_add_client_rpc_timer (srpc_client_rpc_t *rpc)
1029 {
1030         stt_timer_t *timer = &rpc->crpc_timer;
1031
1032         if (rpc->crpc_timeout == 0) return;
1033
1034         CFS_INIT_LIST_HEAD(&timer->stt_list);
1035         timer->stt_data    = rpc;
1036         timer->stt_func    = srpc_client_rpc_expired;
1037         timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1038                                           cfs_time_current_sec());
1039         stt_add_timer(timer);
1040         return;
1041 }
1042
1043 /*
1044  * Called with rpc->crpc_lock held.
1045  *
1046  * Upon exit the RPC expiry timer is not queued and the handler is not
1047  * running on any CPU. */
1048 void
1049 srpc_del_client_rpc_timer (srpc_client_rpc_t *rpc)
1050 {
1051         /* timer not planted or already exploded */
1052         if (rpc->crpc_timeout == 0) return;
1053
1054         /* timer sucessfully defused */
1055         if (stt_del_timer(&rpc->crpc_timer)) return;
1056
1057 #ifdef __KERNEL__
1058         /* timer detonated, wait for it to explode */
1059         while (rpc->crpc_timeout != 0) {
1060                 spin_unlock(&rpc->crpc_lock);
1061
1062                 cfs_schedule();
1063
1064                 spin_lock(&rpc->crpc_lock);
1065         }
1066 #else
1067         LBUG(); /* impossible in single-threaded runtime */
1068 #endif
1069         return;
1070 }
1071
1072 void
1073 srpc_check_sends (srpc_peer_t *peer, int credits)
1074 {
1075         struct list_head  *q;
1076         srpc_client_rpc_t *rpc;
1077
1078         LASSERT (credits >= 0);
1079         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1080
1081         spin_lock(&peer->stp_lock);
1082         peer->stp_credits += credits;
1083
1084         while (peer->stp_credits) {
1085                 if (!list_empty(&peer->stp_ctl_rpcq))
1086                         q = &peer->stp_ctl_rpcq;
1087                 else if (!list_empty(&peer->stp_rpcq))
1088                         q = &peer->stp_rpcq;
1089                 else
1090                         break;
1091
1092                 peer->stp_credits--;
1093
1094                 rpc = list_entry(q->next, srpc_client_rpc_t, crpc_privl);
1095                 list_del_init(&rpc->crpc_privl);
1096                 srpc_client_rpc_decref(rpc);  /* --ref for peer->*rpcq */
1097
1098                 swi_schedule_workitem(&rpc->crpc_wi);
1099         }
1100
1101         spin_unlock(&peer->stp_lock);
1102         return;
1103 }
1104
1105 void
1106 srpc_client_rpc_done (srpc_client_rpc_t *rpc, int status)
1107 {
1108         swi_workitem_t *wi = &rpc->crpc_wi;
1109         srpc_peer_t    *peer = rpc->crpc_peer;
1110
1111         LASSERT (status != 0 || wi->wi_state == SWI_STATE_DONE);
1112
1113         spin_lock(&rpc->crpc_lock);
1114
1115         rpc->crpc_closed = 1;
1116         if (rpc->crpc_status == 0)
1117                 rpc->crpc_status = status;
1118
1119         srpc_del_client_rpc_timer(rpc);
1120
1121         CDEBUG ((status == 0) ? D_NET : D_NETERROR,
1122                 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1123                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1124                 swi_state2str(wi->wi_state), rpc->crpc_aborted, status);
1125
1126         /*
1127          * No one can schedule me now since:
1128          * - RPC timer has been defused.
1129          * - all LNet events have been fired.
1130          * - crpc_closed has been set, preventing srpc_abort_rpc from
1131          *   scheduling me.
1132          * Cancel pending schedules and prevent future schedule attempts:
1133          */
1134         LASSERT (!srpc_event_pending(rpc));
1135         swi_kill_workitem(wi);
1136
1137         spin_unlock(&rpc->crpc_lock);
1138
1139         (*rpc->crpc_done) (rpc);
1140
1141         if (peer != NULL)
1142                 srpc_check_sends(peer, 1);
1143         return;
1144 }
1145
1146 /* sends an outgoing RPC */
1147 int
1148 srpc_send_rpc (swi_workitem_t *wi)
1149 {
1150         int                rc = 0;
1151         srpc_client_rpc_t *rpc = wi->wi_data;
1152         srpc_msg_t        *reply = &rpc->crpc_replymsg;
1153         int                do_bulk = rpc->crpc_bulk.bk_niov > 0;
1154
1155         LASSERT (rpc != NULL);
1156         LASSERT (wi == &rpc->crpc_wi);
1157
1158         spin_lock(&rpc->crpc_lock);
1159
1160         if (rpc->crpc_aborted) {
1161                 spin_unlock(&rpc->crpc_lock);
1162                 goto abort;
1163         }
1164
1165         spin_unlock(&rpc->crpc_lock);
1166
1167         switch (wi->wi_state) {
1168         default:
1169                 LBUG ();
1170         case SWI_STATE_NEWBORN:
1171                 LASSERT (!srpc_event_pending(rpc));
1172
1173                 rc = srpc_prepare_reply(rpc);
1174                 if (rc != 0) {
1175                         srpc_client_rpc_done(rpc, rc);
1176                         return 1;
1177                 }
1178
1179                 rc = srpc_prepare_bulk(rpc);
1180                 if (rc != 0) break;
1181
1182                 wi->wi_state = SWI_STATE_REQUEST_SUBMITTED;
1183                 rc = srpc_send_request(rpc);
1184                 break;
1185
1186         case SWI_STATE_REQUEST_SUBMITTED:
1187                 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1188                  * order; however, they're processed in a strict order:
1189                  * rqt, rpy, and bulk. */
1190                 if (!rpc->crpc_reqstev.ev_fired) break;
1191
1192                 rc = rpc->crpc_reqstev.ev_status;
1193                 if (rc != 0) break;
1194
1195                 wi->wi_state = SWI_STATE_REQUEST_SENT;
1196                 /* perhaps more events, fall thru */
1197         case SWI_STATE_REQUEST_SENT: {
1198                 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1199
1200                 if (!rpc->crpc_replyev.ev_fired) break;
1201
1202                 rc = rpc->crpc_replyev.ev_status;
1203                 if (rc != 0) break;
1204
1205                 if ((reply->msg_type != type &&
1206                      reply->msg_type != __swab32(type)) ||
1207                     (reply->msg_magic != SRPC_MSG_MAGIC &&
1208                      reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1209                         CWARN ("Bad message from %s: type %u (%d expected),"
1210                                " magic %u (%d expected).\n",
1211                                libcfs_id2str(rpc->crpc_dest),
1212                                reply->msg_type, type,
1213                                reply->msg_magic, SRPC_MSG_MAGIC);
1214                         rc = -EBADMSG;
1215                         break;
1216                 }
1217
1218                 if (do_bulk && reply->msg_body.reply.status != 0) {
1219                         CWARN ("Remote error %d at %s, unlink bulk buffer in "
1220                                "case peer didn't initiate bulk transfer\n",
1221                                reply->msg_body.reply.status,
1222                                libcfs_id2str(rpc->crpc_dest));
1223                         LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1224                 }
1225
1226                 wi->wi_state = SWI_STATE_REPLY_RECEIVED;
1227         }
1228         case SWI_STATE_REPLY_RECEIVED:
1229                 if (do_bulk && !rpc->crpc_bulkev.ev_fired) break;
1230
1231                 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1232
1233                 /* Bulk buffer was unlinked due to remote error. Clear error
1234                  * since reply buffer still contains valid data.
1235                  * NB rpc->crpc_done shouldn't look into bulk data in case of
1236                  * remote error. */
1237                 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1238                     rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1239                         rc = 0;
1240
1241                 wi->wi_state = SWI_STATE_DONE;
1242                 srpc_client_rpc_done(rpc, rc);
1243                 return 1;
1244         }
1245
1246         if (rc != 0) {
1247                 spin_lock(&rpc->crpc_lock);
1248                 srpc_abort_rpc(rpc, rc);
1249                 spin_unlock(&rpc->crpc_lock);
1250         }
1251
1252 abort:
1253         if (rpc->crpc_aborted) {
1254                 LNetMDUnlink(rpc->crpc_reqstmdh);
1255                 LNetMDUnlink(rpc->crpc_replymdh);
1256                 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1257
1258                 if (!srpc_event_pending(rpc)) {
1259                         srpc_client_rpc_done(rpc, -EINTR);
1260                         return 1;
1261                 }
1262         }
1263         return 0;
1264 }
1265
1266 srpc_client_rpc_t *
1267 srpc_create_client_rpc (lnet_process_id_t peer, int service,
1268                         int nbulkiov, int bulklen,
1269                         void (*rpc_done)(srpc_client_rpc_t *),
1270                         void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1271 {
1272         srpc_client_rpc_t *rpc;
1273
1274         LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1275                                    crpc_bulk.bk_iovs[nbulkiov]));
1276         if (rpc == NULL)
1277                 return NULL;
1278
1279         srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1280                              bulklen, rpc_done, rpc_fini, priv);
1281         return rpc;
1282 }
1283
1284 /* called with rpc->crpc_lock held */
1285 static inline void
1286 srpc_queue_rpc (srpc_peer_t *peer, srpc_client_rpc_t *rpc)
1287 {
1288         int service = rpc->crpc_service;
1289
1290         LASSERT (peer->stp_nid == rpc->crpc_dest.nid);
1291         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1292
1293         rpc->crpc_peer = peer;
1294
1295         spin_lock(&peer->stp_lock);
1296
1297         /* Framework RPCs that alter session state shall take precedence
1298          * over test RPCs and framework query RPCs */
1299         if (service <= SRPC_FRAMEWORK_SERVICE_MAX_ID &&
1300             service != SRPC_SERVICE_DEBUG &&
1301             service != SRPC_SERVICE_QUERY_STAT)
1302                 list_add_tail(&rpc->crpc_privl, &peer->stp_ctl_rpcq);
1303         else
1304                 list_add_tail(&rpc->crpc_privl, &peer->stp_rpcq);
1305
1306         srpc_client_rpc_addref(rpc); /* ++ref for peer->*rpcq */
1307         spin_unlock(&peer->stp_lock);
1308         return;
1309 }
1310
1311 /* called with rpc->crpc_lock held */
1312 void
1313 srpc_abort_rpc (srpc_client_rpc_t *rpc, int why)
1314 {
1315         srpc_peer_t *peer = rpc->crpc_peer;
1316
1317         LASSERT (why != 0);
1318
1319         if (rpc->crpc_aborted || /* already aborted */
1320             rpc->crpc_closed)    /* callback imminent */
1321                 return;
1322
1323         CDEBUG (D_NET,
1324                 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1325                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1326                 swi_state2str(rpc->crpc_wi.wi_state), why);
1327
1328         rpc->crpc_aborted = 1;
1329         rpc->crpc_status  = why;
1330
1331         if (peer != NULL) {
1332                 spin_lock(&peer->stp_lock);
1333
1334                 if (!list_empty(&rpc->crpc_privl)) { /* still queued */
1335                         list_del_init(&rpc->crpc_privl);
1336                         srpc_client_rpc_decref(rpc); /* --ref for peer->*rpcq */
1337                         rpc->crpc_peer = NULL;       /* no credit taken */
1338                 }
1339
1340                 spin_unlock(&peer->stp_lock);
1341         }
1342
1343         swi_schedule_workitem(&rpc->crpc_wi);
1344         return;
1345 }
1346
1347 /* called with rpc->crpc_lock held */
1348 void
1349 srpc_post_rpc (srpc_client_rpc_t *rpc)
1350 {
1351         srpc_peer_t *peer;
1352
1353         LASSERT (!rpc->crpc_aborted);
1354         LASSERT (rpc->crpc_peer == NULL);
1355         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1356         LASSERT ((rpc->crpc_bulk.bk_len & ~CFS_PAGE_MASK) == 0);
1357
1358         CDEBUG (D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1359                 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1360                 rpc->crpc_timeout);
1361
1362         srpc_add_client_rpc_timer(rpc);
1363
1364         peer = srpc_nid2peer(rpc->crpc_dest.nid);
1365         if (peer == NULL) {
1366                 srpc_abort_rpc(rpc, -ENOMEM);
1367                 return;
1368         }
1369
1370         srpc_queue_rpc(peer, rpc);
1371
1372         spin_unlock(&rpc->crpc_lock);
1373         srpc_check_sends(peer, 0);
1374         spin_lock(&rpc->crpc_lock);
1375         return;
1376 }
1377
1378
1379 int
1380 srpc_send_reply (srpc_server_rpc_t *rpc)
1381 {
1382         srpc_event_t   *ev = &rpc->srpc_ev;
1383         srpc_msg_t     *msg = &rpc->srpc_replymsg;
1384         srpc_buffer_t  *buffer = rpc->srpc_reqstbuf;
1385         srpc_service_t *sv = rpc->srpc_service;
1386         __u64           rpyid;
1387         int             rc;
1388
1389         LASSERT (buffer != NULL);
1390         rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1391
1392         spin_lock(&sv->sv_lock);
1393
1394         if (!sv->sv_shuttingdown &&
1395             sv->sv_id > SRPC_FRAMEWORK_SERVICE_MAX_ID) {
1396                 /* Repost buffer before replying since test client
1397                  * might send me another RPC once it gets the reply */
1398                 if (srpc_service_post_buffer(sv, buffer) != 0)
1399                         CWARN ("Failed to repost %s buffer\n", sv->sv_name);
1400                 rpc->srpc_reqstbuf = NULL;
1401         }
1402
1403         spin_unlock(&sv->sv_lock);
1404
1405         ev->ev_fired = 0;
1406         ev->ev_data  = rpc;
1407         ev->ev_type  = SRPC_REPLY_SENT;
1408
1409         msg->msg_magic   = SRPC_MSG_MAGIC;
1410         msg->msg_version = SRPC_MSG_VERSION;
1411         msg->msg_type    = srpc_service2reply(sv->sv_id);
1412
1413         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1414                                    sizeof(*msg), LNET_MD_OP_PUT,
1415                                    rpc->srpc_peer, rpc->srpc_self,
1416                                    &rpc->srpc_replymdh, ev);
1417         if (rc != 0)
1418                 ev->ev_fired = 1;  /* no more event expected */
1419         return rc;
1420 }
1421
1422 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1423 void
1424 srpc_lnet_ev_handler (lnet_event_t *ev)
1425 {
1426         srpc_event_t      *rpcev = ev->md.user_ptr;
1427         srpc_client_rpc_t *crpc;
1428         srpc_server_rpc_t *srpc;
1429         srpc_buffer_t     *buffer;
1430         srpc_service_t    *sv;
1431         srpc_msg_t        *msg;
1432         srpc_msg_type_t    type;
1433         int                fired_flag = 1;
1434
1435         LASSERT (!in_interrupt());
1436
1437         if (ev->status != 0) {
1438                 spin_lock(&srpc_data.rpc_glock);
1439                 srpc_data.rpc_counters.errors++;
1440                 spin_unlock(&srpc_data.rpc_glock);
1441         }
1442
1443         rpcev->ev_lnet = ev->type;
1444
1445         switch (rpcev->ev_type) {
1446         default:
1447                 LBUG ();
1448         case SRPC_REQUEST_SENT:
1449                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1450                         spin_lock(&srpc_data.rpc_glock);
1451                         srpc_data.rpc_counters.rpcs_sent++;
1452                         spin_unlock(&srpc_data.rpc_glock);
1453                 }
1454         case SRPC_REPLY_RCVD:
1455         case SRPC_BULK_REQ_RCVD:
1456                 crpc = rpcev->ev_data;
1457
1458                 LASSERT (rpcev == &crpc->crpc_reqstev ||
1459                          rpcev == &crpc->crpc_replyev ||
1460                          rpcev == &crpc->crpc_bulkev);
1461
1462                 spin_lock(&crpc->crpc_lock);
1463
1464                 LASSERT (rpcev->ev_fired == 0);
1465                 rpcev->ev_fired  = 1;
1466                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1467                                                 -EINTR : ev->status;
1468                 swi_schedule_workitem(&crpc->crpc_wi);
1469
1470                 spin_unlock(&crpc->crpc_lock);
1471                 break;
1472
1473         case SRPC_REQUEST_RCVD:
1474                 sv = rpcev->ev_data;
1475
1476                 LASSERT (rpcev == &sv->sv_ev);
1477
1478                 spin_lock(&sv->sv_lock);
1479
1480                 LASSERT (ev->unlinked);
1481                 LASSERT (ev->type == LNET_EVENT_PUT ||
1482                          ev->type == LNET_EVENT_UNLINK);
1483                 LASSERT (ev->type != LNET_EVENT_UNLINK ||
1484                          sv->sv_shuttingdown);
1485
1486                 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1487                 buffer->buf_peer = ev->initiator;
1488                 buffer->buf_self = ev->target.nid;
1489
1490                 sv->sv_nposted_msg--;
1491                 LASSERT (sv->sv_nposted_msg >= 0);
1492
1493                 if (sv->sv_shuttingdown) {
1494                         /* Leave buffer on sv->sv_posted_msgq since
1495                          * srpc_finish_service needs to traverse it. */
1496                         spin_unlock(&sv->sv_lock);
1497                         break;
1498                 }
1499
1500                 list_del(&buffer->buf_list); /* from sv->sv_posted_msgq */
1501                 msg = &buffer->buf_msg;
1502                 type = srpc_service2request(sv->sv_id);
1503
1504                 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1505                     (msg->msg_type != type &&
1506                      msg->msg_type != __swab32(type)) ||
1507                     (msg->msg_magic != SRPC_MSG_MAGIC &&
1508                      msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1509                         CERROR ("Dropping RPC (%s) from %s: "
1510                                 "status %d mlength %d type %u magic %u.\n",
1511                                 sv->sv_name, libcfs_id2str(ev->initiator),
1512                                 ev->status, ev->mlength,
1513                                 msg->msg_type, msg->msg_magic);
1514
1515                         /* NB might drop sv_lock in srpc_service_recycle_buffer,
1516                          * sv_nposted_msg++ as an implicit reference to prevent
1517                          * sv from disappearing under me */
1518                         sv->sv_nposted_msg++;
1519                         srpc_service_recycle_buffer(sv, buffer);
1520                         sv->sv_nposted_msg--;
1521                         spin_unlock(&sv->sv_lock);
1522
1523                         if (ev->status == 0) { /* status!=0 counted already */
1524                                 spin_lock(&srpc_data.rpc_glock);
1525                                 srpc_data.rpc_counters.errors++;
1526                                 spin_unlock(&srpc_data.rpc_glock);
1527                         }
1528                         break;
1529                 }
1530
1531                 if (!list_empty(&sv->sv_free_rpcq)) {
1532                         srpc = list_entry(sv->sv_free_rpcq.next,
1533                                           srpc_server_rpc_t, srpc_list);
1534                         list_del(&srpc->srpc_list);
1535
1536                         srpc_init_server_rpc(srpc, sv, buffer);
1537                         list_add_tail(&srpc->srpc_list, &sv->sv_active_rpcq);
1538                         srpc_schedule_server_rpc(srpc);
1539                 } else {
1540                         list_add_tail(&buffer->buf_list, &sv->sv_blocked_msgq);
1541                 }
1542
1543                 spin_unlock(&sv->sv_lock);
1544
1545                 spin_lock(&srpc_data.rpc_glock);
1546                 srpc_data.rpc_counters.rpcs_rcvd++;
1547                 spin_unlock(&srpc_data.rpc_glock);
1548                 break;
1549
1550         case SRPC_BULK_GET_RPLD:
1551                 LASSERT (ev->type == LNET_EVENT_SEND ||
1552                          ev->type == LNET_EVENT_REPLY ||
1553                          ev->type == LNET_EVENT_UNLINK);
1554
1555                 if (ev->type == LNET_EVENT_SEND && !ev->unlinked) {
1556                         if (ev->status == 0)
1557                                 break; /* wait for the final LNET_EVENT_REPLY */
1558                         else
1559                                 fired_flag = 0; /* LNET_EVENT_REPLY may arrive
1560                                                    (optimized GET case) */
1561                 }
1562         case SRPC_BULK_PUT_SENT:
1563                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1564                         spin_lock(&srpc_data.rpc_glock);
1565
1566                         if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1567                                 srpc_data.rpc_counters.bulk_get += ev->mlength;
1568                         else
1569                                 srpc_data.rpc_counters.bulk_put += ev->mlength;
1570
1571                         spin_unlock(&srpc_data.rpc_glock);
1572                 }
1573         case SRPC_REPLY_SENT:
1574                 srpc = rpcev->ev_data;
1575                 sv = srpc->srpc_service;
1576
1577                 LASSERT (rpcev == &srpc->srpc_ev);
1578
1579                 spin_lock(&sv->sv_lock);
1580                 if (fired_flag)
1581                         rpcev->ev_fired  = 1;
1582
1583                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1584                                                 -EINTR : ev->status;
1585
1586                 srpc_schedule_server_rpc(srpc);
1587                 spin_unlock(&sv->sv_lock);
1588                 break;
1589         }
1590
1591         return;
1592 }
1593
1594 #ifndef __KERNEL__
1595
1596 int
1597 srpc_check_event (int timeout)
1598 {
1599         lnet_event_t ev;
1600         int          rc;
1601         int          i;
1602
1603         rc = LNetEQPoll(&srpc_data.rpc_lnet_eq, 1,
1604                         timeout * 1000, &ev, &i);
1605         if (rc == 0) return 0;
1606
1607         LASSERT (rc == -EOVERFLOW || rc == 1);
1608
1609         /* We can't affort to miss any events... */
1610         if (rc == -EOVERFLOW) {
1611                 CERROR ("Dropped an event!!!\n");
1612                 abort();
1613         }
1614
1615         srpc_lnet_ev_handler(&ev);
1616         return 1;
1617 }
1618
1619 #endif
1620
1621 int
1622 srpc_startup (void)
1623 {
1624         int i;
1625         int rc;
1626
1627 #ifndef __KERNEL__
1628         char *s;
1629
1630         s = getenv("SRPC_PEER_CREDITS");
1631         srpc_peer_credits = (s != NULL) ? atoi(s) : srpc_peer_credits;
1632 #endif
1633
1634         if (srpc_peer_credits <= 0) {
1635                 CERROR("Peer credits must be positive: %d\n", srpc_peer_credits);
1636                 return -EINVAL;
1637         }
1638
1639         memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1640         spin_lock_init(&srpc_data.rpc_glock);
1641
1642         /* 1 second pause to avoid timestamp reuse */
1643         cfs_pause(cfs_time_seconds(1));
1644         srpc_data.rpc_matchbits = ((__u64) cfs_time_current_sec()) << 48;
1645
1646         srpc_data.rpc_state = SRPC_STATE_NONE;
1647
1648         LIBCFS_ALLOC(srpc_data.rpc_peers,
1649                      sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1650         if (srpc_data.rpc_peers == NULL) {
1651                 CERROR ("Failed to alloc peer hash.\n");
1652                 return -ENOMEM;
1653         }
1654
1655         for (i = 0; i < SRPC_PEER_HASH_SIZE; i++)
1656                 CFS_INIT_LIST_HEAD(&srpc_data.rpc_peers[i]);
1657
1658 #ifdef __KERNEL__
1659         rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1660 #else
1661         if (the_lnet.ln_server_mode_flag)
1662                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1663         else
1664                 rc = LNetNIInit(getpid() | LNET_PID_USERFLAG);
1665 #endif
1666         if (rc < 0) {
1667                 CERROR ("LNetNIInit() has failed: %d\n", rc);
1668                 LIBCFS_FREE(srpc_data.rpc_peers,
1669                             sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1670                 return rc;
1671         }
1672
1673         srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1674
1675         srpc_data.rpc_lnet_eq = LNET_EQ_NONE;
1676 #ifdef __KERNEL__
1677         rc = LNetEQAlloc(16, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1678 #else
1679         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &srpc_data.rpc_lnet_eq);
1680 #endif
1681         if (rc != 0) {
1682                 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1683                 goto bail;
1684         }
1685
1686         rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1687         LASSERT (rc == 0);
1688
1689         srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1690
1691         rc = swi_startup();
1692         if (rc != 0)
1693                 goto bail;
1694
1695         srpc_data.rpc_state = SRPC_STATE_WI_INIT;
1696
1697         rc = stt_startup();
1698
1699 bail:
1700         if (rc != 0)
1701                 srpc_shutdown();
1702         else
1703                 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1704
1705         return rc;
1706 }
1707
1708 void
1709 srpc_shutdown (void)
1710 {
1711         int i;
1712         int rc;
1713         int state;
1714
1715         state = srpc_data.rpc_state;
1716         srpc_data.rpc_state = SRPC_STATE_STOPPING;
1717
1718         switch (state) {
1719         default:
1720                 LBUG ();
1721         case SRPC_STATE_RUNNING:
1722                 spin_lock(&srpc_data.rpc_glock);
1723
1724                 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1725                         srpc_service_t *sv = srpc_data.rpc_services[i];
1726
1727                         LASSERTF (sv == NULL,
1728                                   "service not empty: id %d, name %s\n",
1729                                   i, sv->sv_name);
1730                 }
1731
1732                 spin_unlock(&srpc_data.rpc_glock);
1733
1734                 stt_shutdown();
1735
1736         case SRPC_STATE_WI_INIT:
1737                 swi_shutdown();
1738
1739         case SRPC_STATE_EQ_INIT:
1740                 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1741                 LASSERT (rc == 0);
1742                 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1743                 LASSERT (rc == 0); /* the EQ should have no user by now */
1744
1745         case SRPC_STATE_NI_INIT:
1746                 LNetNIFini();
1747                 break;
1748         }
1749
1750         /* srpc_peer_t's are kept in hash until shutdown */
1751         for (i = 0; i < SRPC_PEER_HASH_SIZE; i++) {
1752                 srpc_peer_t *peer;
1753
1754                 while (!list_empty(&srpc_data.rpc_peers[i])) {
1755                         peer = list_entry(srpc_data.rpc_peers[i].next,
1756                                           srpc_peer_t, stp_list);
1757                         list_del(&peer->stp_list);
1758
1759                         LASSERT (list_empty(&peer->stp_rpcq));
1760                         LASSERT (list_empty(&peer->stp_ctl_rpcq));
1761                         LASSERT (peer->stp_credits == srpc_peer_credits);
1762
1763                         LIBCFS_FREE(peer, sizeof(srpc_peer_t));
1764                 }
1765         }
1766
1767         LIBCFS_FREE(srpc_data.rpc_peers,
1768                     sizeof(struct list_head) * SRPC_PEER_HASH_SIZE);
1769         return;
1770 }