lnet/selftest/rpc.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lnet/selftest/rpc.c
  37  *
  38  * Author: Isaac Huang <isaac@clusterfs.com>
  39  *
  40  * 2012-05-13: Liang Zhen <liang@whamcloud.com>
  41  * - percpt data for service to improve smp performance
  42  * - code cleanup
  43  */
  44
  45 #define DEBUG_SUBSYSTEM S_LNET
  46
  47 #include "selftest.h"
  48
  49 typedef enum {
  50         SRPC_STATE_NONE,
  51         SRPC_STATE_NI_INIT,
  52         SRPC_STATE_EQ_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         lnet_handle_eq_t rpc_lnet_eq;   /* _the_ LNet event queue */
  61         srpc_state_t     rpc_state;
  62         srpc_counters_t  rpc_counters;
  63         __u64            rpc_matchbits; /* matchbits counter */
  64 } srpc_data;
  65
  66 static inline int
  67 srpc_serv_portal(int svc_id)
  68 {
  69         return svc_id < SRPC_FRAMEWORK_SERVICE_MAX_ID ?
  70                SRPC_FRAMEWORK_REQUEST_PORTAL : SRPC_REQUEST_PORTAL;
  71 }
  72
  73 /* forward ref's */
  74 int srpc_handle_rpc (swi_workitem_t *wi);
  75
  76 void srpc_get_counters (srpc_counters_t *cnt)
  77 {
  78         spin_lock(&srpc_data.rpc_glock);
  79         *cnt = srpc_data.rpc_counters;
  80         spin_unlock(&srpc_data.rpc_glock);
  81 }
  82
  83 void srpc_set_counters (const srpc_counters_t *cnt)
  84 {
  85         spin_lock(&srpc_data.rpc_glock);
  86         srpc_data.rpc_counters = *cnt;
  87         spin_unlock(&srpc_data.rpc_glock);
  88 }
  89
  90 int
  91 srpc_add_bulk_page(srpc_bulk_t *bk, struct page *pg, int i, int nob)
  92 {
  93         nob = min(nob, (int)PAGE_CACHE_SIZE);
  94
  95         LASSERT(nob > 0);
  96         LASSERT(i >= 0 && i < bk->bk_niov);
  97
  98 #ifdef __KERNEL__
  99         bk->bk_iovs[i].kiov_offset = 0;
 100         bk->bk_iovs[i].kiov_page   = pg;
 101         bk->bk_iovs[i].kiov_len    = nob;
 102 #else
 103         LASSERT(bk->bk_pages != NULL);
 104
 105         bk->bk_pages[i] = pg;
 106         bk->bk_iovs[i].iov_len  = nob;
 107         bk->bk_iovs[i].iov_base = page_address(pg);
 108 #endif
 109         return nob;
 110 }
 111
 112 void
 113 srpc_free_bulk (srpc_bulk_t *bk)
 114 {
 115         int         i;
 116         struct page *pg;
 117
 118         LASSERT (bk != NULL);
 119 #ifndef __KERNEL__
 120         LASSERT (bk->bk_pages != NULL);
 121 #endif
 122
 123         for (i = 0; i < bk->bk_niov; i++) {
 124 #ifdef __KERNEL__
 125                 pg = bk->bk_iovs[i].kiov_page;
 126 #else
 127                 pg = bk->bk_pages[i];
 128 #endif
 129                 if (pg == NULL) break;
 130
 131                 __free_page(pg);
 132         }
 133
 134 #ifndef __KERNEL__
 135         LIBCFS_FREE(bk->bk_pages, sizeof(struct page *) * bk->bk_niov);
 136 #endif
 137         LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
 138         return;
 139 }
 140
 141 srpc_bulk_t *
 142 srpc_alloc_bulk(int cpt, unsigned bulk_npg, unsigned bulk_len, int sink)
 143 {
 144         srpc_bulk_t  *bk;
 145         struct page  **pages;
 146         int           i;
 147
 148         LASSERT(bulk_npg > 0 && bulk_npg <= LNET_MAX_IOV);
 149
 150         LIBCFS_CPT_ALLOC(bk, lnet_cpt_table(), cpt,
 151                          offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 152         if (bk == NULL) {
 153                 CERROR("Can't allocate descriptor for %d pages\n", bulk_npg);
 154                 return NULL;
 155         }
 156
 157         memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 158         bk->bk_sink   = sink;
 159         bk->bk_len    = bulk_len;
 160         bk->bk_niov   = bulk_npg;
 161 #ifndef __KERNEL__
 162         LIBCFS_CPT_ALLOC(pages, lnet_cpt_table(), cpt,
 163                          sizeof(struct page *) * bulk_npg);
 164         if (pages == NULL) {
 165                 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 166                 CERROR("Can't allocate page array for %d pages\n", bulk_npg);
 167                 return NULL;
 168         }
 169
 170         memset(pages, 0, sizeof(struct page *) * bulk_npg);
 171         bk->bk_pages = pages;
 172 #else
 173         UNUSED(pages);
 174 #endif
 175
 176         for (i = 0; i < bulk_npg; i++) {
 177                 struct page *pg;
 178                 int         nob;
 179
 180                 pg = cfs_page_cpt_alloc(lnet_cpt_table(), cpt, GFP_IOFS);
 181                 if (pg == NULL) {
 182                         CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
 183                         srpc_free_bulk(bk);
 184                         return NULL;
 185                 }
 186
 187                 nob = srpc_add_bulk_page(bk, pg, i, bulk_len);
 188                 bulk_len -= nob;
 189         }
 190
 191         return bk;
 192 }
 193
 194 static inline __u64
 195 srpc_next_id (void)
 196 {
 197         __u64 id;
 198
 199         spin_lock(&srpc_data.rpc_glock);
 200         id = srpc_data.rpc_matchbits++;
 201         spin_unlock(&srpc_data.rpc_glock);
 202         return id;
 203 }
 204
 205 void
 206 srpc_init_server_rpc(struct srpc_server_rpc *rpc,
 207                      struct srpc_service_cd *scd,
 208                      struct srpc_buffer *buffer)
 209 {
 210         memset(rpc, 0, sizeof(*rpc));
 211         swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc,
 212                           srpc_serv_is_framework(scd->scd_svc) ?
 213                           lst_sched_serial : lst_sched_test[scd->scd_cpt]);
 214
 215         rpc->srpc_ev.ev_fired = 1; /* no event expected now */
 216
 217         rpc->srpc_scd      = scd;
 218         rpc->srpc_reqstbuf = buffer;
 219         rpc->srpc_peer     = buffer->buf_peer;
 220         rpc->srpc_self     = buffer->buf_self;
 221         LNetInvalidateHandle(&rpc->srpc_replymdh);
 222 }
 223
 224 static void
 225 srpc_service_fini(struct srpc_service *svc)
 226 {
 227         struct srpc_service_cd  *scd;
 228         struct srpc_server_rpc  *rpc;
 229         struct srpc_buffer      *buf;
 230         cfs_list_t              *q;
 231         int                     i;
 232
 233         if (svc->sv_cpt_data == NULL)
 234                 return;
 235
 236         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 237                 while (1) {
 238                         if (!cfs_list_empty(&scd->scd_buf_posted))
 239                                 q = &scd->scd_buf_posted;
 240                         else if (!cfs_list_empty(&scd->scd_buf_blocked))
 241                                 q = &scd->scd_buf_blocked;
 242                         else
 243                                 break;
 244
 245                         while (!cfs_list_empty(q)) {
 246                                 buf = cfs_list_entry(q->next,
 247                                                      struct srpc_buffer,
 248                                                      buf_list);
 249                                 cfs_list_del(&buf->buf_list);
 250                                 LIBCFS_FREE(buf, sizeof(*buf));
 251                         }
 252                 }
 253
 254                 LASSERT(cfs_list_empty(&scd->scd_rpc_active));
 255
 256                 while (!cfs_list_empty(&scd->scd_rpc_free)) {
 257                         rpc = cfs_list_entry(scd->scd_rpc_free.next,
 258                                              struct srpc_server_rpc,
 259                                              srpc_list);
 260                         cfs_list_del(&rpc->srpc_list);
 261                         LIBCFS_FREE(rpc, sizeof(*rpc));
 262                 }
 263         }
 264
 265         cfs_percpt_free(svc->sv_cpt_data);
 266         svc->sv_cpt_data = NULL;
 267 }
 268
 269 static int
 270 srpc_service_nrpcs(struct srpc_service *svc)
 271 {
 272         int nrpcs = svc->sv_wi_total / svc->sv_ncpts;
 273
 274         return srpc_serv_is_framework(svc) ?
 275                max(nrpcs, SFW_FRWK_WI_MIN) : max(nrpcs, SFW_TEST_WI_MIN);
 276 }
 277
 278 int srpc_add_buffer(struct swi_workitem *wi);
 279
 280 static int
 281 srpc_service_init(struct srpc_service *svc)
 282 {
 283         struct srpc_service_cd  *scd;
 284         struct srpc_server_rpc  *rpc;
 285         int                     nrpcs;
 286         int                     i;
 287         int                     j;
 288
 289         svc->sv_shuttingdown = 0;
 290
 291         svc->sv_cpt_data = cfs_percpt_alloc(lnet_cpt_table(),
 292                                             sizeof(struct srpc_service_cd));
 293         if (svc->sv_cpt_data == NULL)
 294                 return -ENOMEM;
 295
 296         svc->sv_ncpts = srpc_serv_is_framework(svc) ?
 297                         1 : cfs_cpt_number(lnet_cpt_table());
 298         nrpcs = srpc_service_nrpcs(svc);
 299
 300         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 301                 scd->scd_cpt = i;
 302                 scd->scd_svc = svc;
 303                 spin_lock_init(&scd->scd_lock);
 304                 CFS_INIT_LIST_HEAD(&scd->scd_rpc_free);
 305                 CFS_INIT_LIST_HEAD(&scd->scd_rpc_active);
 306                 CFS_INIT_LIST_HEAD(&scd->scd_buf_posted);
 307                 CFS_INIT_LIST_HEAD(&scd->scd_buf_blocked);
 308
 309                 scd->scd_ev.ev_data = scd;
 310                 scd->scd_ev.ev_type = SRPC_REQUEST_RCVD;
 311
 312                 /* NB: don't use lst_sched_serial for adding buffer,
 313                  * see details in srpc_service_add_buffers() */
 314                 swi_init_workitem(&scd->scd_buf_wi, scd,
 315                                   srpc_add_buffer, lst_sched_test[i]);
 316
 317                 if (i != 0 && srpc_serv_is_framework(svc)) {
 318                         /* NB: framework service only needs srpc_service_cd for
 319                          * one partition, but we allocate for all to make
 320                          * it easier to implement, it will waste a little
 321                          * memory but nobody should care about this */
 322                         continue;
 323                 }
 324
 325                 for (j = 0; j < nrpcs; j++) {
 326                         LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
 327                                          i, sizeof(*rpc));
 328                         if (rpc == NULL) {
 329                                 srpc_service_fini(svc);
 330                                 return -ENOMEM;
 331                         }
 332                         cfs_list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 333                 }
 334         }
 335
 336         return 0;
 337 }
 338
 339 int
 340 srpc_add_service(struct srpc_service *sv)
 341 {
 342         int id = sv->sv_id;
 343
 344         LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
 345
 346         if (srpc_service_init(sv) != 0)
 347                 return -ENOMEM;
 348
 349         spin_lock(&srpc_data.rpc_glock);
 350
 351         LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
 352
 353         if (srpc_data.rpc_services[id] != NULL) {
 354                 spin_unlock(&srpc_data.rpc_glock);
 355                 goto failed;
 356         }
 357
 358         srpc_data.rpc_services[id] = sv;
 359         spin_unlock(&srpc_data.rpc_glock);
 360
 361         CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
 362         return 0;
 363
 364  failed:
 365         srpc_service_fini(sv);
 366         return -EBUSY;
 367 }
 368
 369 int
 370 srpc_remove_service (srpc_service_t *sv)
 371 {
 372         int id = sv->sv_id;
 373
 374         spin_lock(&srpc_data.rpc_glock);
 375
 376         if (srpc_data.rpc_services[id] != sv) {
 377                 spin_unlock(&srpc_data.rpc_glock);
 378                 return -ENOENT;
 379         }
 380
 381         srpc_data.rpc_services[id] = NULL;
 382         spin_unlock(&srpc_data.rpc_glock);
 383         return 0;
 384 }
 385
 386 int
 387 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
 388                        int len, int options, lnet_process_id_t peer,
 389                        lnet_handle_md_t *mdh, srpc_event_t *ev)
 390 {
 391         int              rc;
 392         lnet_md_t        md;
 393         lnet_handle_me_t meh;
 394
 395         rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
 396                           local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
 397         if (rc != 0) {
 398                 CERROR ("LNetMEAttach failed: %d\n", rc);
 399                 LASSERT (rc == -ENOMEM);
 400                 return -ENOMEM;
 401         }
 402
 403         md.threshold = 1;
 404         md.user_ptr  = ev;
 405         md.start     = buf;
 406         md.length    = len;
 407         md.options   = options;
 408         md.eq_handle = srpc_data.rpc_lnet_eq;
 409
 410         rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
 411         if (rc != 0) {
 412                 CERROR ("LNetMDAttach failed: %d\n", rc);
 413                 LASSERT (rc == -ENOMEM);
 414
 415                 rc = LNetMEUnlink(meh);
 416                 LASSERT (rc == 0);
 417                 return -ENOMEM;
 418         }
 419
 420         CDEBUG (D_NET,
 421                 "Posted passive RDMA: peer %s, portal %d, matchbits "LPX64"\n",
 422                 libcfs_id2str(peer), portal, matchbits);
 423         return 0;
 424 }
 425
 426 int
 427 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
 428                       int options, lnet_process_id_t peer, lnet_nid_t self,
 429                       lnet_handle_md_t *mdh, srpc_event_t *ev)
 430 {
 431         int       rc;
 432         lnet_md_t md;
 433
 434         md.user_ptr  = ev;
 435         md.start     = buf;
 436         md.length    = len;
 437         md.eq_handle = srpc_data.rpc_lnet_eq;
 438         md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
 439         md.options   = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
 440
 441         rc = LNetMDBind(md, LNET_UNLINK, mdh);
 442         if (rc != 0) {
 443                 CERROR ("LNetMDBind failed: %d\n", rc);
 444                 LASSERT (rc == -ENOMEM);
 445                 return -ENOMEM;
 446         }
 447
 448         /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
 449          * they're only meaningful for MDs attached to an ME (i.e. passive
 450          * buffers... */
 451         if ((options & LNET_MD_OP_PUT) != 0) {
 452                 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
 453                              portal, matchbits, 0, 0);
 454         } else {
 455                 LASSERT ((options & LNET_MD_OP_GET) != 0);
 456
 457                 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
 458         }
 459
 460         if (rc != 0) {
 461                 CERROR ("LNet%s(%s, %d, "LPD64") failed: %d\n",
 462                         ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
 463                         libcfs_id2str(peer), portal, matchbits, rc);
 464
 465                 /* The forthcoming unlink event will complete this operation
 466                  * with failure, so fall through and return success here.
 467                  */
 468                 rc = LNetMDUnlink(*mdh);
 469                 LASSERT (rc == 0);
 470         } else {
 471                 CDEBUG (D_NET,
 472                         "Posted active RDMA: peer %s, portal %u, matchbits "LPX64"\n",
 473                         libcfs_id2str(peer), portal, matchbits);
 474         }
 475         return 0;
 476 }
 477
 478 int
 479 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
 480                         int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
 481 {
 482         return srpc_post_active_rdma(srpc_serv_portal(service), service,
 483                                      buf, len, LNET_MD_OP_PUT, peer,
 484                                      LNET_NID_ANY, mdh, ev);
 485 }
 486
 487 int
 488 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
 489                          lnet_handle_md_t *mdh, srpc_event_t *ev)
 490 {
 491         lnet_process_id_t any = {0};
 492
 493         any.nid = LNET_NID_ANY;
 494         any.pid = LNET_PID_ANY;
 495
 496         return srpc_post_passive_rdma(srpc_serv_portal(service),
 497                                       local, service, buf, len,
 498                                       LNET_MD_OP_PUT, any, mdh, ev);
 499 }
 500
 501 int
 502 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
 503 {
 504         struct srpc_service     *sv = scd->scd_svc;
 505         struct srpc_msg         *msg = &buf->buf_msg;
 506         int                     rc;
 507
 508         LNetInvalidateHandle(&buf->buf_mdh);
 509         cfs_list_add(&buf->buf_list, &scd->scd_buf_posted);
 510         scd->scd_buf_nposted++;
 511         spin_unlock(&scd->scd_lock);
 512
 513         rc = srpc_post_passive_rqtbuf(sv->sv_id,
 514                                       !srpc_serv_is_framework(sv),
 515                                       msg, sizeof(*msg), &buf->buf_mdh,
 516                                       &scd->scd_ev);
 517
 518         /* At this point, a RPC (new or delayed) may have arrived in
 519          * msg and its event handler has been called. So we must add
 520          * buf to scd_buf_posted _before_ dropping scd_lock */
 521
 522         spin_lock(&scd->scd_lock);
 523
 524         if (rc == 0) {
 525                 if (!sv->sv_shuttingdown)
 526                         return 0;
 527
 528                 spin_unlock(&scd->scd_lock);
 529                 /* srpc_shutdown_service might have tried to unlink me
 530                  * when my buf_mdh was still invalid */
 531                 LNetMDUnlink(buf->buf_mdh);
 532                 spin_lock(&scd->scd_lock);
 533                 return 0;
 534         }
 535
 536         scd->scd_buf_nposted--;
 537         if (sv->sv_shuttingdown)
 538                 return rc; /* don't allow to change scd_buf_posted */
 539
 540         cfs_list_del(&buf->buf_list);
 541         spin_unlock(&scd->scd_lock);
 542
 543         LIBCFS_FREE(buf, sizeof(*buf));
 544
 545         spin_lock(&scd->scd_lock);
 546         return rc;
 547 }
 548
 549 int
 550 srpc_add_buffer(struct swi_workitem *wi)
 551 {
 552         struct srpc_service_cd  *scd = wi->swi_workitem.wi_data;
 553         struct srpc_buffer      *buf;
 554         int                     rc = 0;
 555
 556         /* it's called by workitem scheduler threads, these threads
 557          * should have been set CPT affinity, so buffers will be posted
 558          * on CPT local list of Portal */
 559         spin_lock(&scd->scd_lock);
 560
 561         while (scd->scd_buf_adjust > 0 &&
 562                !scd->scd_svc->sv_shuttingdown) {
 563                 scd->scd_buf_adjust--; /* consume it */
 564                 scd->scd_buf_posting++;
 565
 566                 spin_unlock(&scd->scd_lock);
 567
 568                 LIBCFS_ALLOC(buf, sizeof(*buf));
 569                 if (buf == NULL) {
 570                         CERROR("Failed to add new buf to service: %s\n",
 571                                scd->scd_svc->sv_name);
 572                         spin_lock(&scd->scd_lock);
 573                         rc = -ENOMEM;
 574                         break;
 575                 }
 576
 577                 spin_lock(&scd->scd_lock);
 578                 if (scd->scd_svc->sv_shuttingdown) {
 579                         spin_unlock(&scd->scd_lock);
 580                         LIBCFS_FREE(buf, sizeof(*buf));
 581
 582                         spin_lock(&scd->scd_lock);
 583                         rc = -ESHUTDOWN;
 584                         break;
 585                 }
 586
 587                 rc = srpc_service_post_buffer(scd, buf);
 588                 if (rc != 0)
 589                         break; /* buf has been freed inside */
 590
 591                 LASSERT(scd->scd_buf_posting > 0);
 592                 scd->scd_buf_posting--;
 593                 scd->scd_buf_total++;
 594                 scd->scd_buf_low = MAX(2, scd->scd_buf_total / 4);
 595         }
 596
 597         if (rc != 0) {
 598                 scd->scd_buf_err_stamp = cfs_time_current_sec();
 599                 scd->scd_buf_err = rc;
 600
 601                 LASSERT(scd->scd_buf_posting > 0);
 602                 scd->scd_buf_posting--;
 603         }
 604
 605         spin_unlock(&scd->scd_lock);
 606         return 0;
 607 }
 608
 609 int
 610 srpc_service_add_buffers(struct srpc_service *sv, int nbuffer)
 611 {
 612         struct srpc_service_cd  *scd;
 613         int                     rc = 0;
 614         int                     i;
 615
 616         LASSERTF(nbuffer > 0, "nbuffer must be positive: %d\n", nbuffer);
 617
 618         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 619                 spin_lock(&scd->scd_lock);
 620
 621                 scd->scd_buf_err = 0;
 622                 scd->scd_buf_err_stamp = 0;
 623                 scd->scd_buf_posting = 0;
 624                 scd->scd_buf_adjust = nbuffer;
 625                 /* start to post buffers */
 626                 swi_schedule_workitem(&scd->scd_buf_wi);
 627                 spin_unlock(&scd->scd_lock);
 628
 629                 /* framework service only post buffer for one partition  */
 630                 if (srpc_serv_is_framework(sv))
 631                         break;
 632         }
 633
 634         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 635                 spin_lock(&scd->scd_lock);
 636                 /*
 637                  * NB: srpc_service_add_buffers() can be called inside
 638                  * thread context of lst_sched_serial, and we don't normally
 639                  * allow to sleep inside thread context of WI scheduler
 640                  * because it will block current scheduler thread from doing
 641                  * anything else, even worse, it could deadlock if it's
 642                  * waiting on result from another WI of the same scheduler.
 643                  * However, it's safe at here because scd_buf_wi is scheduled
 644                  * by thread in a different WI scheduler (lst_sched_test),
 645                  * so we don't have any risk of deadlock, though this could
 646                  * block all WIs pending on lst_sched_serial for a moment
 647                  * which is not good but not fatal.
 648                  */
 649                 lst_wait_until(scd->scd_buf_err != 0 ||
 650                                (scd->scd_buf_adjust == 0 &&
 651                                 scd->scd_buf_posting == 0),
 652                                scd->scd_lock, "waiting for adding buffer\n");
 653
 654                 if (scd->scd_buf_err != 0 && rc == 0)
 655                         rc = scd->scd_buf_err;
 656
 657                 spin_unlock(&scd->scd_lock);
 658         }
 659
 660         return rc;
 661 }
 662
 663 void
 664 srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer)
 665 {
 666         struct srpc_service_cd  *scd;
 667         int                     num;
 668         int                     i;
 669
 670         LASSERT(!sv->sv_shuttingdown);
 671
 672         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 673                 spin_lock(&scd->scd_lock);
 674
 675                 num = scd->scd_buf_total + scd->scd_buf_posting;
 676                 scd->scd_buf_adjust -= min(nbuffer, num);
 677
 678                 spin_unlock(&scd->scd_lock);
 679         }
 680 }
 681
 682 /* returns 1 if sv has finished, otherwise 0 */
 683 int
 684 srpc_finish_service(struct srpc_service *sv)
 685 {
 686         struct srpc_service_cd  *scd;
 687         struct srpc_server_rpc  *rpc;
 688         int                     i;
 689
 690         LASSERT(sv->sv_shuttingdown); /* srpc_shutdown_service called */
 691
 692         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 693                 spin_lock(&scd->scd_lock);
 694                 if (!swi_deschedule_workitem(&scd->scd_buf_wi)) {
 695                         spin_unlock(&scd->scd_lock);
 696                         return 0;
 697                 }
 698
 699                 if (scd->scd_buf_nposted > 0) {
 700                         CDEBUG(D_NET, "waiting for %d posted buffers to unlink",
 701                                scd->scd_buf_nposted);
 702                         spin_unlock(&scd->scd_lock);
 703                         return 0;
 704                 }
 705
 706                 if (cfs_list_empty(&scd->scd_rpc_active)) {
 707                         spin_unlock(&scd->scd_lock);
 708                         continue;
 709                 }
 710
 711                 rpc = cfs_list_entry(scd->scd_rpc_active.next,
 712                                      struct srpc_server_rpc, srpc_list);
 713                 CNETERR("Active RPC %p on shutdown: sv %s, peer %s, "
 714                         "wi %s scheduled %d running %d, "
 715                         "ev fired %d type %d status %d lnet %d\n",
 716                         rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 717                         swi_state2str(rpc->srpc_wi.swi_state),
 718                         rpc->srpc_wi.swi_workitem.wi_scheduled,
 719                         rpc->srpc_wi.swi_workitem.wi_running,
 720                         rpc->srpc_ev.ev_fired, rpc->srpc_ev.ev_type,
 721                         rpc->srpc_ev.ev_status, rpc->srpc_ev.ev_lnet);
 722                 spin_unlock(&scd->scd_lock);
 723                 return 0;
 724         }
 725
 726         /* no lock needed from now on */
 727         srpc_service_fini(sv);
 728         return 1;
 729 }
 730
 731 /* called with sv->sv_lock held */
 732 void
 733 srpc_service_recycle_buffer(struct srpc_service_cd *scd, srpc_buffer_t *buf)
 734 {
 735         if (!scd->scd_svc->sv_shuttingdown && scd->scd_buf_adjust >= 0) {
 736                 if (srpc_service_post_buffer(scd, buf) != 0) {
 737                         CWARN("Failed to post %s buffer\n",
 738                               scd->scd_svc->sv_name);
 739                 }
 740                 return;
 741         }
 742
 743         /* service is shutting down, or we want to recycle some buffers */
 744         scd->scd_buf_total--;
 745
 746         if (scd->scd_buf_adjust < 0) {
 747                 scd->scd_buf_adjust++;
 748                 if (scd->scd_buf_adjust < 0 &&
 749                     scd->scd_buf_total == 0 && scd->scd_buf_posting == 0) {
 750                         CDEBUG(D_INFO,
 751                                "Try to recyle %d buffers but nothing left\n",
 752                                scd->scd_buf_adjust);
 753                         scd->scd_buf_adjust = 0;
 754                 }
 755         }
 756
 757         spin_unlock(&scd->scd_lock);
 758         LIBCFS_FREE(buf, sizeof(*buf));
 759         spin_lock(&scd->scd_lock);
 760 }
 761
 762 void
 763 srpc_abort_service(struct srpc_service *sv)
 764 {
 765         struct srpc_service_cd  *scd;
 766         struct srpc_server_rpc  *rpc;
 767         int                     i;
 768
 769         CDEBUG(D_NET, "Aborting service: id %d, name %s\n",
 770                sv->sv_id, sv->sv_name);
 771
 772         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 773                 spin_lock(&scd->scd_lock);
 774
 775                 /* schedule in-flight RPCs to notice the abort, NB:
 776                  * racing with incoming RPCs; complete fix should make test
 777                  * RPCs carry session ID in its headers */
 778                 cfs_list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list) {
 779                         rpc->srpc_aborted = 1;
 780                         swi_schedule_workitem(&rpc->srpc_wi);
 781                 }
 782
 783                 spin_unlock(&scd->scd_lock);
 784         }
 785 }
 786
 787 void
 788 srpc_shutdown_service(srpc_service_t *sv)
 789 {
 790         struct srpc_service_cd  *scd;
 791         struct srpc_server_rpc  *rpc;
 792         srpc_buffer_t           *buf;
 793         int                     i;
 794
 795         CDEBUG(D_NET, "Shutting down service: id %d, name %s\n",
 796                sv->sv_id, sv->sv_name);
 797
 798         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 799                 spin_lock(&scd->scd_lock);
 800
 801         sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
 802
 803         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 804                 spin_unlock(&scd->scd_lock);
 805
 806         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 807                 spin_lock(&scd->scd_lock);
 808
 809                 /* schedule in-flight RPCs to notice the shutdown */
 810                 cfs_list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list)
 811                         swi_schedule_workitem(&rpc->srpc_wi);
 812
 813                 spin_unlock(&scd->scd_lock);
 814
 815                 /* OK to traverse scd_buf_posted without lock, since no one
 816                  * touches scd_buf_posted now */
 817                 cfs_list_for_each_entry(buf, &scd->scd_buf_posted, buf_list)
 818                         LNetMDUnlink(buf->buf_mdh);
 819         }
 820 }
 821
 822 int
 823 srpc_send_request (srpc_client_rpc_t *rpc)
 824 {
 825         srpc_event_t *ev = &rpc->crpc_reqstev;
 826         int           rc;
 827
 828         ev->ev_fired = 0;
 829         ev->ev_data  = rpc;
 830         ev->ev_type  = SRPC_REQUEST_SENT;
 831
 832         rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
 833                                      &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
 834                                      &rpc->crpc_reqstmdh, ev);
 835         if (rc != 0) {
 836                 LASSERT (rc == -ENOMEM);
 837                 ev->ev_fired = 1;  /* no more event expected */
 838         }
 839         return rc;
 840 }
 841
 842 int
 843 srpc_prepare_reply (srpc_client_rpc_t *rpc)
 844 {
 845         srpc_event_t *ev = &rpc->crpc_replyev;
 846         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
 847         int           rc;
 848
 849         ev->ev_fired = 0;
 850         ev->ev_data  = rpc;
 851         ev->ev_type  = SRPC_REPLY_RCVD;
 852
 853         *id = srpc_next_id();
 854
 855         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 856                                     &rpc->crpc_replymsg, sizeof(srpc_msg_t),
 857                                     LNET_MD_OP_PUT, rpc->crpc_dest,
 858                                     &rpc->crpc_replymdh, ev);
 859         if (rc != 0) {
 860                 LASSERT (rc == -ENOMEM);
 861                 ev->ev_fired = 1;  /* no more event expected */
 862         }
 863         return rc;
 864 }
 865
 866 int
 867 srpc_prepare_bulk (srpc_client_rpc_t *rpc)
 868 {
 869         srpc_bulk_t  *bk = &rpc->crpc_bulk;
 870         srpc_event_t *ev = &rpc->crpc_bulkev;
 871         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
 872         int           rc;
 873         int           opt;
 874
 875         LASSERT (bk->bk_niov <= LNET_MAX_IOV);
 876
 877         if (bk->bk_niov == 0) return 0; /* nothing to do */
 878
 879         opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
 880 #ifdef __KERNEL__
 881         opt |= LNET_MD_KIOV;
 882 #else
 883         opt |= LNET_MD_IOVEC;
 884 #endif
 885
 886         ev->ev_fired = 0;
 887         ev->ev_data  = rpc;
 888         ev->ev_type  = SRPC_BULK_REQ_RCVD;
 889
 890         *id = srpc_next_id();
 891
 892         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 893                                     &bk->bk_iovs[0], bk->bk_niov, opt,
 894                                     rpc->crpc_dest, &bk->bk_mdh, ev);
 895         if (rc != 0) {
 896                 LASSERT (rc == -ENOMEM);
 897                 ev->ev_fired = 1;  /* no more event expected */
 898         }
 899         return rc;
 900 }
 901
 902 int
 903 srpc_do_bulk (srpc_server_rpc_t *rpc)
 904 {
 905         srpc_event_t  *ev = &rpc->srpc_ev;
 906         srpc_bulk_t   *bk = rpc->srpc_bulk;
 907         __u64          id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
 908         int            rc;
 909         int            opt;
 910
 911         LASSERT (bk != NULL);
 912
 913         opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
 914 #ifdef __KERNEL__
 915         opt |= LNET_MD_KIOV;
 916 #else
 917         opt |= LNET_MD_IOVEC;
 918 #endif
 919
 920         ev->ev_fired = 0;
 921         ev->ev_data  = rpc;
 922         ev->ev_type  = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
 923
 924         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
 925                                    &bk->bk_iovs[0], bk->bk_niov, opt,
 926                                    rpc->srpc_peer, rpc->srpc_self,
 927                                    &bk->bk_mdh, ev);
 928         if (rc != 0)
 929                 ev->ev_fired = 1;  /* no more event expected */
 930         return rc;
 931 }
 932
 933 /* only called from srpc_handle_rpc */
 934 void
 935 srpc_server_rpc_done(srpc_server_rpc_t *rpc, int status)
 936 {
 937         struct srpc_service_cd  *scd = rpc->srpc_scd;
 938         struct srpc_service     *sv  = scd->scd_svc;
 939         srpc_buffer_t           *buffer;
 940
 941         LASSERT (status != 0 || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
 942
 943         rpc->srpc_status = status;
 944
 945         CDEBUG_LIMIT (status == 0 ? D_NET : D_NETERROR,
 946                 "Server RPC %p done: service %s, peer %s, status %s:%d\n",
 947                 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 948                 swi_state2str(rpc->srpc_wi.swi_state), status);
 949
 950         if (status != 0) {
 951                 spin_lock(&srpc_data.rpc_glock);
 952                 srpc_data.rpc_counters.rpcs_dropped++;
 953                 spin_unlock(&srpc_data.rpc_glock);
 954         }
 955
 956         if (rpc->srpc_done != NULL)
 957                 (*rpc->srpc_done) (rpc);
 958         LASSERT(rpc->srpc_bulk == NULL);
 959
 960         spin_lock(&scd->scd_lock);
 961
 962         if (rpc->srpc_reqstbuf != NULL) {
 963                 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
 964                  * sv won't go away for scd_rpc_active must not be empty */
 965                 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
 966                 rpc->srpc_reqstbuf = NULL;
 967         }
 968
 969         cfs_list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
 970
 971         /*
 972          * No one can schedule me now since:
 973          * - I'm not on scd_rpc_active.
 974          * - all LNet events have been fired.
 975          * Cancel pending schedules and prevent future schedule attempts:
 976          */
 977         LASSERT(rpc->srpc_ev.ev_fired);
 978         swi_exit_workitem(&rpc->srpc_wi);
 979
 980         if (!sv->sv_shuttingdown && !cfs_list_empty(&scd->scd_buf_blocked)) {
 981                 buffer = cfs_list_entry(scd->scd_buf_blocked.next,
 982                                         srpc_buffer_t, buf_list);
 983                 cfs_list_del(&buffer->buf_list);
 984
 985                 srpc_init_server_rpc(rpc, scd, buffer);
 986                 cfs_list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
 987                 swi_schedule_workitem(&rpc->srpc_wi);
 988         } else {
 989                 cfs_list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 990         }
 991
 992         spin_unlock(&scd->scd_lock);
 993         return;
 994 }
 995
 996 /* handles an incoming RPC */
 997 int
 998 srpc_handle_rpc(swi_workitem_t *wi)
 999 {
1000         struct srpc_server_rpc  *rpc = wi->swi_workitem.wi_data;
1001         struct srpc_service_cd  *scd = rpc->srpc_scd;
1002         struct srpc_service     *sv = scd->scd_svc;
1003         srpc_event_t            *ev = &rpc->srpc_ev;
1004         int                     rc = 0;
1005
1006         LASSERT(wi == &rpc->srpc_wi);
1007
1008         spin_lock(&scd->scd_lock);
1009
1010         if (sv->sv_shuttingdown || rpc->srpc_aborted) {
1011                 spin_unlock(&scd->scd_lock);
1012
1013                 if (rpc->srpc_bulk != NULL)
1014                         LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
1015                 LNetMDUnlink(rpc->srpc_replymdh);
1016
1017                 if (ev->ev_fired) { /* no more event, OK to finish */
1018                         srpc_server_rpc_done(rpc, -ESHUTDOWN);
1019                         return 1;
1020                 }
1021                 return 0;
1022         }
1023
1024         spin_unlock(&scd->scd_lock);
1025
1026         switch (wi->swi_state) {
1027         default:
1028                 LBUG ();
1029         case SWI_STATE_NEWBORN: {
1030                 srpc_msg_t           *msg;
1031                 srpc_generic_reply_t *reply;
1032
1033                 msg = &rpc->srpc_reqstbuf->buf_msg;
1034                 reply = &rpc->srpc_replymsg.msg_body.reply;
1035
1036                 if (msg->msg_magic == 0) {
1037                         /* moaned already in srpc_lnet_ev_handler */
1038                         srpc_server_rpc_done(rpc, EBADMSG);
1039                         return 1;
1040                 }
1041
1042                 srpc_unpack_msg_hdr(msg);
1043                 if (msg->msg_version != SRPC_MSG_VERSION) {
1044                         CWARN("Version mismatch: %u, %u expected, from %s\n",
1045                               msg->msg_version, SRPC_MSG_VERSION,
1046                               libcfs_id2str(rpc->srpc_peer));
1047                         reply->status = EPROTO;
1048                         /* drop through and send reply */
1049                 } else {
1050                         reply->status = 0;
1051                         rc = (*sv->sv_handler)(rpc);
1052                         LASSERT(reply->status == 0 || !rpc->srpc_bulk);
1053                         if (rc != 0) {
1054                                 srpc_server_rpc_done(rpc, rc);
1055                                 return 1;
1056                         }
1057                 }
1058
1059                 wi->swi_state = SWI_STATE_BULK_STARTED;
1060
1061                 if (rpc->srpc_bulk != NULL) {
1062                         rc = srpc_do_bulk(rpc);
1063                         if (rc == 0)
1064                                 return 0; /* wait for bulk */
1065
1066                         LASSERT (ev->ev_fired);
1067                         ev->ev_status = rc;
1068                 }
1069         }
1070         case SWI_STATE_BULK_STARTED:
1071                 LASSERT (rpc->srpc_bulk == NULL || ev->ev_fired);
1072
1073                 if (rpc->srpc_bulk != NULL) {
1074                         rc = ev->ev_status;
1075
1076                         if (sv->sv_bulk_ready != NULL)
1077                                 rc = (*sv->sv_bulk_ready) (rpc, rc);
1078
1079                         if (rc != 0) {
1080                                 srpc_server_rpc_done(rpc, rc);
1081                                 return 1;
1082                         }
1083                 }
1084
1085                 wi->swi_state = SWI_STATE_REPLY_SUBMITTED;
1086                 rc = srpc_send_reply(rpc);
1087                 if (rc == 0)
1088                         return 0; /* wait for reply */
1089                 srpc_server_rpc_done(rpc, rc);
1090                 return 1;
1091
1092         case SWI_STATE_REPLY_SUBMITTED:
1093                 if (!ev->ev_fired) {
1094                         CERROR("RPC %p: bulk %p, service %d\n",
1095                                rpc, rpc->srpc_bulk, sv->sv_id);
1096                         CERROR("Event: status %d, type %d, lnet %d\n",
1097                                ev->ev_status, ev->ev_type, ev->ev_lnet);
1098                         LASSERT (ev->ev_fired);
1099                 }
1100
1101                 wi->swi_state = SWI_STATE_DONE;
1102                 srpc_server_rpc_done(rpc, ev->ev_status);
1103                 return 1;
1104         }
1105
1106         return 0;
1107 }
1108
1109 void
1110 srpc_client_rpc_expired (void *data)
1111 {
1112         srpc_client_rpc_t *rpc = data;
1113
1114         CWARN ("Client RPC expired: service %d, peer %s, timeout %d.\n",
1115                rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1116                rpc->crpc_timeout);
1117
1118         spin_lock(&rpc->crpc_lock);
1119
1120         rpc->crpc_timeout = 0;
1121         srpc_abort_rpc(rpc, -ETIMEDOUT);
1122
1123         spin_unlock(&rpc->crpc_lock);
1124
1125         spin_lock(&srpc_data.rpc_glock);
1126         srpc_data.rpc_counters.rpcs_expired++;
1127         spin_unlock(&srpc_data.rpc_glock);
1128 }
1129
1130 inline void
1131 srpc_add_client_rpc_timer (srpc_client_rpc_t *rpc)
1132 {
1133         stt_timer_t *timer = &rpc->crpc_timer;
1134
1135         if (rpc->crpc_timeout == 0) return;
1136
1137         CFS_INIT_LIST_HEAD(&timer->stt_list);
1138         timer->stt_data    = rpc;
1139         timer->stt_func    = srpc_client_rpc_expired;
1140         timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1141                                           cfs_time_current_sec());
1142         stt_add_timer(timer);
1143         return;
1144 }
1145
1146 /*
1147  * Called with rpc->crpc_lock held.
1148  *
1149  * Upon exit the RPC expiry timer is not queued and the handler is not
1150  * running on any CPU. */
1151 void
1152 srpc_del_client_rpc_timer (srpc_client_rpc_t *rpc)
1153 {
1154         /* timer not planted or already exploded */
1155         if (rpc->crpc_timeout == 0)
1156                 return;
1157
1158         /* timer sucessfully defused */
1159         if (stt_del_timer(&rpc->crpc_timer))
1160                 return;
1161
1162 #ifdef __KERNEL__
1163         /* timer detonated, wait for it to explode */
1164         while (rpc->crpc_timeout != 0) {
1165                 spin_unlock(&rpc->crpc_lock);
1166
1167                 cfs_schedule();
1168
1169                 spin_lock(&rpc->crpc_lock);
1170         }
1171 #else
1172         LBUG(); /* impossible in single-threaded runtime */
1173 #endif
1174 }
1175
1176 void
1177 srpc_client_rpc_done (srpc_client_rpc_t *rpc, int status)
1178 {
1179         swi_workitem_t *wi = &rpc->crpc_wi;
1180
1181         LASSERT(status != 0 || wi->swi_state == SWI_STATE_DONE);
1182
1183         spin_lock(&rpc->crpc_lock);
1184
1185         rpc->crpc_closed = 1;
1186         if (rpc->crpc_status == 0)
1187                 rpc->crpc_status = status;
1188
1189         srpc_del_client_rpc_timer(rpc);
1190
1191         CDEBUG_LIMIT ((status == 0) ? D_NET : D_NETERROR,
1192                 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1193                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1194                 swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1195
1196         /*
1197          * No one can schedule me now since:
1198          * - RPC timer has been defused.
1199          * - all LNet events have been fired.
1200          * - crpc_closed has been set, preventing srpc_abort_rpc from
1201          *   scheduling me.
1202          * Cancel pending schedules and prevent future schedule attempts:
1203          */
1204         LASSERT (!srpc_event_pending(rpc));
1205         swi_exit_workitem(wi);
1206
1207         spin_unlock(&rpc->crpc_lock);
1208
1209         (*rpc->crpc_done)(rpc);
1210         return;
1211 }
1212
1213 /* sends an outgoing RPC */
1214 int
1215 srpc_send_rpc (swi_workitem_t *wi)
1216 {
1217         int                rc = 0;
1218         srpc_client_rpc_t *rpc;
1219         srpc_msg_t        *reply;
1220         int                do_bulk;
1221
1222         LASSERT(wi != NULL);
1223
1224         rpc = wi->swi_workitem.wi_data;
1225
1226         LASSERT (rpc != NULL);
1227         LASSERT (wi == &rpc->crpc_wi);
1228
1229         reply = &rpc->crpc_replymsg;
1230         do_bulk = rpc->crpc_bulk.bk_niov > 0;
1231
1232         spin_lock(&rpc->crpc_lock);
1233
1234         if (rpc->crpc_aborted) {
1235                 spin_unlock(&rpc->crpc_lock);
1236                 goto abort;
1237         }
1238
1239         spin_unlock(&rpc->crpc_lock);
1240
1241         switch (wi->swi_state) {
1242         default:
1243                 LBUG ();
1244         case SWI_STATE_NEWBORN:
1245                 LASSERT (!srpc_event_pending(rpc));
1246
1247                 rc = srpc_prepare_reply(rpc);
1248                 if (rc != 0) {
1249                         srpc_client_rpc_done(rpc, rc);
1250                         return 1;
1251                 }
1252
1253                 rc = srpc_prepare_bulk(rpc);
1254                 if (rc != 0) break;
1255
1256                 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1257                 rc = srpc_send_request(rpc);
1258                 break;
1259
1260         case SWI_STATE_REQUEST_SUBMITTED:
1261                 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1262                  * order; however, they're processed in a strict order:
1263                  * rqt, rpy, and bulk. */
1264                 if (!rpc->crpc_reqstev.ev_fired) break;
1265
1266                 rc = rpc->crpc_reqstev.ev_status;
1267                 if (rc != 0) break;
1268
1269                 wi->swi_state = SWI_STATE_REQUEST_SENT;
1270                 /* perhaps more events, fall thru */
1271         case SWI_STATE_REQUEST_SENT: {
1272                 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1273
1274                 if (!rpc->crpc_replyev.ev_fired) break;
1275
1276                 rc = rpc->crpc_replyev.ev_status;
1277                 if (rc != 0) break;
1278
1279                 srpc_unpack_msg_hdr(reply);
1280                 if (reply->msg_type != type ||
1281                     (reply->msg_magic != SRPC_MSG_MAGIC &&
1282                      reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1283                         CWARN ("Bad message from %s: type %u (%d expected),"
1284                                " magic %u (%d expected).\n",
1285                                libcfs_id2str(rpc->crpc_dest),
1286                                reply->msg_type, type,
1287                                reply->msg_magic, SRPC_MSG_MAGIC);
1288                         rc = -EBADMSG;
1289                         break;
1290                 }
1291
1292                 if (do_bulk && reply->msg_body.reply.status != 0) {
1293                         CWARN ("Remote error %d at %s, unlink bulk buffer in "
1294                                "case peer didn't initiate bulk transfer\n",
1295                                reply->msg_body.reply.status,
1296                                libcfs_id2str(rpc->crpc_dest));
1297                         LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1298                 }
1299
1300                 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1301         }
1302         case SWI_STATE_REPLY_RECEIVED:
1303                 if (do_bulk && !rpc->crpc_bulkev.ev_fired) break;
1304
1305                 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1306
1307                 /* Bulk buffer was unlinked due to remote error. Clear error
1308                  * since reply buffer still contains valid data.
1309                  * NB rpc->crpc_done shouldn't look into bulk data in case of
1310                  * remote error. */
1311                 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1312                     rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1313                         rc = 0;
1314
1315                 wi->swi_state = SWI_STATE_DONE;
1316                 srpc_client_rpc_done(rpc, rc);
1317                 return 1;
1318         }
1319
1320         if (rc != 0) {
1321                 spin_lock(&rpc->crpc_lock);
1322                 srpc_abort_rpc(rpc, rc);
1323                 spin_unlock(&rpc->crpc_lock);
1324         }
1325
1326 abort:
1327         if (rpc->crpc_aborted) {
1328                 LNetMDUnlink(rpc->crpc_reqstmdh);
1329                 LNetMDUnlink(rpc->crpc_replymdh);
1330                 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1331
1332                 if (!srpc_event_pending(rpc)) {
1333                         srpc_client_rpc_done(rpc, -EINTR);
1334                         return 1;
1335                 }
1336         }
1337         return 0;
1338 }
1339
1340 srpc_client_rpc_t *
1341 srpc_create_client_rpc (lnet_process_id_t peer, int service,
1342                         int nbulkiov, int bulklen,
1343                         void (*rpc_done)(srpc_client_rpc_t *),
1344                         void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1345 {
1346         srpc_client_rpc_t *rpc;
1347
1348         LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1349                                    crpc_bulk.bk_iovs[nbulkiov]));
1350         if (rpc == NULL)
1351                 return NULL;
1352
1353         srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1354                              bulklen, rpc_done, rpc_fini, priv);
1355         return rpc;
1356 }
1357
1358 /* called with rpc->crpc_lock held */
1359 void
1360 srpc_abort_rpc (srpc_client_rpc_t *rpc, int why)
1361 {
1362         LASSERT (why != 0);
1363
1364         if (rpc->crpc_aborted || /* already aborted */
1365             rpc->crpc_closed)    /* callback imminent */
1366                 return;
1367
1368         CDEBUG (D_NET,
1369                 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1370                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1371                 swi_state2str(rpc->crpc_wi.swi_state), why);
1372
1373         rpc->crpc_aborted = 1;
1374         rpc->crpc_status  = why;
1375         swi_schedule_workitem(&rpc->crpc_wi);
1376         return;
1377 }
1378
1379 /* called with rpc->crpc_lock held */
1380 void
1381 srpc_post_rpc (srpc_client_rpc_t *rpc)
1382 {
1383         LASSERT (!rpc->crpc_aborted);
1384         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1385
1386         CDEBUG (D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1387                 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1388                 rpc->crpc_timeout);
1389
1390         srpc_add_client_rpc_timer(rpc);
1391         swi_schedule_workitem(&rpc->crpc_wi);
1392         return;
1393 }
1394
1395
1396 int
1397 srpc_send_reply(struct srpc_server_rpc *rpc)
1398 {
1399         srpc_event_t            *ev = &rpc->srpc_ev;
1400         struct srpc_msg         *msg = &rpc->srpc_replymsg;
1401         struct srpc_buffer      *buffer = rpc->srpc_reqstbuf;
1402         struct srpc_service_cd  *scd = rpc->srpc_scd;
1403         struct srpc_service     *sv = scd->scd_svc;
1404         __u64                   rpyid;
1405         int                     rc;
1406
1407         LASSERT(buffer != NULL);
1408         rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1409
1410         spin_lock(&scd->scd_lock);
1411
1412         if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1413                 /* Repost buffer before replying since test client
1414                  * might send me another RPC once it gets the reply */
1415                 if (srpc_service_post_buffer(scd, buffer) != 0)
1416                         CWARN("Failed to repost %s buffer\n", sv->sv_name);
1417                 rpc->srpc_reqstbuf = NULL;
1418         }
1419
1420         spin_unlock(&scd->scd_lock);
1421
1422         ev->ev_fired = 0;
1423         ev->ev_data  = rpc;
1424         ev->ev_type  = SRPC_REPLY_SENT;
1425
1426         msg->msg_magic   = SRPC_MSG_MAGIC;
1427         msg->msg_version = SRPC_MSG_VERSION;
1428         msg->msg_type    = srpc_service2reply(sv->sv_id);
1429
1430         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1431                                    sizeof(*msg), LNET_MD_OP_PUT,
1432                                    rpc->srpc_peer, rpc->srpc_self,
1433                                    &rpc->srpc_replymdh, ev);
1434         if (rc != 0)
1435                 ev->ev_fired = 1;  /* no more event expected */
1436         return rc;
1437 }
1438
1439 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1440 void
1441 srpc_lnet_ev_handler(lnet_event_t *ev)
1442 {
1443         struct srpc_service_cd  *scd;
1444         srpc_event_t      *rpcev = ev->md.user_ptr;
1445         srpc_client_rpc_t *crpc;
1446         srpc_server_rpc_t *srpc;
1447         srpc_buffer_t     *buffer;
1448         srpc_service_t    *sv;
1449         srpc_msg_t        *msg;
1450         srpc_msg_type_t    type;
1451
1452         LASSERT (!cfs_in_interrupt());
1453
1454         if (ev->status != 0) {
1455                 spin_lock(&srpc_data.rpc_glock);
1456                 srpc_data.rpc_counters.errors++;
1457                 spin_unlock(&srpc_data.rpc_glock);
1458         }
1459
1460         rpcev->ev_lnet = ev->type;
1461
1462         switch (rpcev->ev_type) {
1463         default:
1464                 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1465                        rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1466                 LBUG ();
1467         case SRPC_REQUEST_SENT:
1468                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1469                         spin_lock(&srpc_data.rpc_glock);
1470                         srpc_data.rpc_counters.rpcs_sent++;
1471                         spin_unlock(&srpc_data.rpc_glock);
1472                 }
1473         case SRPC_REPLY_RCVD:
1474         case SRPC_BULK_REQ_RCVD:
1475                 crpc = rpcev->ev_data;
1476
1477                 if (rpcev != &crpc->crpc_reqstev &&
1478                     rpcev != &crpc->crpc_replyev &&
1479                     rpcev != &crpc->crpc_bulkev) {
1480                         CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1481                                rpcev, crpc, &crpc->crpc_reqstev,
1482                                &crpc->crpc_replyev, &crpc->crpc_bulkev);
1483                         CERROR("Bad event: status %d, type %d, lnet %d\n",
1484                                rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1485                         LBUG ();
1486                 }
1487
1488                 spin_lock(&crpc->crpc_lock);
1489
1490                 LASSERT(rpcev->ev_fired == 0);
1491                 rpcev->ev_fired  = 1;
1492                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1493                                                 -EINTR : ev->status;
1494                 swi_schedule_workitem(&crpc->crpc_wi);
1495
1496                 spin_unlock(&crpc->crpc_lock);
1497                 break;
1498
1499         case SRPC_REQUEST_RCVD:
1500                 scd = rpcev->ev_data;
1501                 sv = scd->scd_svc;
1502
1503                 LASSERT(rpcev == &scd->scd_ev);
1504
1505                 spin_lock(&scd->scd_lock);
1506
1507                 LASSERT (ev->unlinked);
1508                 LASSERT (ev->type == LNET_EVENT_PUT ||
1509                          ev->type == LNET_EVENT_UNLINK);
1510                 LASSERT (ev->type != LNET_EVENT_UNLINK ||
1511                          sv->sv_shuttingdown);
1512
1513                 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1514                 buffer->buf_peer = ev->initiator;
1515                 buffer->buf_self = ev->target.nid;
1516
1517                 LASSERT(scd->scd_buf_nposted > 0);
1518                 scd->scd_buf_nposted--;
1519
1520                 if (sv->sv_shuttingdown) {
1521                         /* Leave buffer on scd->scd_buf_nposted since
1522                          * srpc_finish_service needs to traverse it. */
1523                         spin_unlock(&scd->scd_lock);
1524                         break;
1525                 }
1526
1527                 if (scd->scd_buf_err_stamp != 0 &&
1528                     scd->scd_buf_err_stamp < cfs_time_current_sec()) {
1529                         /* re-enable adding buffer */
1530                         scd->scd_buf_err_stamp = 0;
1531                         scd->scd_buf_err = 0;
1532                 }
1533
1534                 if (scd->scd_buf_err == 0 && /* adding buffer is enabled */
1535                     scd->scd_buf_adjust == 0 &&
1536                     scd->scd_buf_nposted < scd->scd_buf_low) {
1537                         scd->scd_buf_adjust = MAX(scd->scd_buf_total / 2,
1538                                                   SFW_TEST_WI_MIN);
1539                         swi_schedule_workitem(&scd->scd_buf_wi);
1540                 }
1541
1542                 cfs_list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1543                 msg = &buffer->buf_msg;
1544                 type = srpc_service2request(sv->sv_id);
1545
1546                 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1547                     (msg->msg_type != type &&
1548                      msg->msg_type != __swab32(type)) ||
1549                     (msg->msg_magic != SRPC_MSG_MAGIC &&
1550                      msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1551                         CERROR ("Dropping RPC (%s) from %s: "
1552                                 "status %d mlength %d type %u magic %u.\n",
1553                                 sv->sv_name, libcfs_id2str(ev->initiator),
1554                                 ev->status, ev->mlength,
1555                                 msg->msg_type, msg->msg_magic);
1556
1557                         /* NB can't call srpc_service_recycle_buffer here since
1558                          * it may call LNetM[DE]Attach. The invalid magic tells
1559                          * srpc_handle_rpc to drop this RPC */
1560                         msg->msg_magic = 0;
1561                 }
1562
1563                 if (!cfs_list_empty(&scd->scd_rpc_free)) {
1564                         srpc = cfs_list_entry(scd->scd_rpc_free.next,
1565                                               struct srpc_server_rpc,
1566                                               srpc_list);
1567                         cfs_list_del(&srpc->srpc_list);
1568
1569                         srpc_init_server_rpc(srpc, scd, buffer);
1570                         cfs_list_add_tail(&srpc->srpc_list,
1571                                           &scd->scd_rpc_active);
1572                         swi_schedule_workitem(&srpc->srpc_wi);
1573                 } else {
1574                         cfs_list_add_tail(&buffer->buf_list,
1575                                           &scd->scd_buf_blocked);
1576                 }
1577
1578                 spin_unlock(&scd->scd_lock);
1579
1580                 spin_lock(&srpc_data.rpc_glock);
1581                 srpc_data.rpc_counters.rpcs_rcvd++;
1582                 spin_unlock(&srpc_data.rpc_glock);
1583                 break;
1584
1585         case SRPC_BULK_GET_RPLD:
1586                 LASSERT (ev->type == LNET_EVENT_SEND ||
1587                          ev->type == LNET_EVENT_REPLY ||
1588                          ev->type == LNET_EVENT_UNLINK);
1589
1590                 if (!ev->unlinked)
1591                         break; /* wait for final event */
1592
1593         case SRPC_BULK_PUT_SENT:
1594                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1595                         spin_lock(&srpc_data.rpc_glock);
1596
1597                         if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1598                                 srpc_data.rpc_counters.bulk_get += ev->mlength;
1599                         else
1600                                 srpc_data.rpc_counters.bulk_put += ev->mlength;
1601
1602                         spin_unlock(&srpc_data.rpc_glock);
1603                 }
1604         case SRPC_REPLY_SENT:
1605                 srpc = rpcev->ev_data;
1606                 scd  = srpc->srpc_scd;
1607
1608                 LASSERT(rpcev == &srpc->srpc_ev);
1609
1610                 spin_lock(&scd->scd_lock);
1611
1612                 rpcev->ev_fired  = 1;
1613                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1614                                    -EINTR : ev->status;
1615                 swi_schedule_workitem(&srpc->srpc_wi);
1616
1617                 spin_unlock(&scd->scd_lock);
1618                 break;
1619         }
1620 }
1621
1622 #ifndef __KERNEL__
1623
1624 int
1625 srpc_check_event (int timeout)
1626 {
1627         lnet_event_t ev;
1628         int          rc;
1629         int          i;
1630
1631         rc = LNetEQPoll(&srpc_data.rpc_lnet_eq, 1,
1632                         timeout * 1000, &ev, &i);
1633         if (rc == 0) return 0;
1634
1635         LASSERT (rc == -EOVERFLOW || rc == 1);
1636
1637         /* We can't affort to miss any events... */
1638         if (rc == -EOVERFLOW) {
1639                 CERROR ("Dropped an event!!!\n");
1640                 abort();
1641         }
1642
1643         srpc_lnet_ev_handler(&ev);
1644         return 1;
1645 }
1646
1647 #endif
1648
1649 int
1650 srpc_startup (void)
1651 {
1652         int rc;
1653
1654         memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1655         spin_lock_init(&srpc_data.rpc_glock);
1656
1657         /* 1 second pause to avoid timestamp reuse */
1658         cfs_pause(cfs_time_seconds(1));
1659         srpc_data.rpc_matchbits = ((__u64) cfs_time_current_sec()) << 48;
1660
1661         srpc_data.rpc_state = SRPC_STATE_NONE;
1662
1663 #ifdef __KERNEL__
1664         rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1665 #else
1666         if (the_lnet.ln_server_mode_flag)
1667                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1668         else
1669                 rc = LNetNIInit(getpid() | LNET_PID_USERFLAG);
1670 #endif
1671         if (rc < 0) {
1672                 CERROR ("LNetNIInit() has failed: %d\n", rc);
1673                 return rc;
1674         }
1675
1676         srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1677
1678         LNetInvalidateHandle(&srpc_data.rpc_lnet_eq);
1679 #ifdef __KERNEL__
1680         rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1681 #else
1682         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &srpc_data.rpc_lnet_eq);
1683 #endif
1684         if (rc != 0) {
1685                 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1686                 goto bail;
1687         }
1688
1689         rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1690         LASSERT(rc == 0);
1691         rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1692         LASSERT(rc == 0);
1693
1694         srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1695
1696         rc = stt_startup();
1697
1698 bail:
1699         if (rc != 0)
1700                 srpc_shutdown();
1701         else
1702                 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1703
1704         return rc;
1705 }
1706
1707 void
1708 srpc_shutdown (void)
1709 {
1710         int i;
1711         int rc;
1712         int state;
1713
1714         state = srpc_data.rpc_state;
1715         srpc_data.rpc_state = SRPC_STATE_STOPPING;
1716
1717         switch (state) {
1718         default:
1719                 LBUG ();
1720         case SRPC_STATE_RUNNING:
1721                 spin_lock(&srpc_data.rpc_glock);
1722
1723                 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1724                         srpc_service_t *sv = srpc_data.rpc_services[i];
1725
1726                         LASSERTF (sv == NULL,
1727                                   "service not empty: id %d, name %s\n",
1728                                   i, sv->sv_name);
1729                 }
1730
1731                 spin_unlock(&srpc_data.rpc_glock);
1732
1733                 stt_shutdown();
1734
1735         case SRPC_STATE_EQ_INIT:
1736                 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1737                 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1738                 LASSERT (rc == 0);
1739                 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1740                 LASSERT (rc == 0); /* the EQ should have no user by now */
1741
1742         case SRPC_STATE_NI_INIT:
1743                 LNetNIFini();
1744         }
1745
1746         return;
1747 }