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 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  *
  34  * lnet/selftest/rpc.c
  35  *
  36  * Author: Isaac Huang <isaac@clusterfs.com>
  37  *
  38  * 2012-05-13: Liang Zhen <liang@whamcloud.com>
  39  * - percpt data for service to improve smp performance
  40  * - code cleanup
  41  */
  42
  43 #define DEBUG_SUBSYSTEM S_LNET
  44
  45 #include "selftest.h"
  46
  47 typedef enum {
  48         SRPC_STATE_NONE,
  49         SRPC_STATE_NI_INIT,
  50         SRPC_STATE_EQ_INIT,
  51         SRPC_STATE_RUNNING,
  52         SRPC_STATE_STOPPING,
  53 } srpc_state_t;
  54
  55 struct smoketest_rpc {
  56         cfs_spinlock_t    rpc_glock;     /* global lock */
  57         srpc_service_t   *rpc_services[SRPC_SERVICE_MAX_ID + 1];
  58         lnet_handle_eq_t  rpc_lnet_eq;   /* _the_ LNet event queue */
  59         srpc_state_t      rpc_state;
  60         srpc_counters_t   rpc_counters;
  61         __u64             rpc_matchbits; /* matchbits counter */
  62 } srpc_data;
  63
  64 static inline int
  65 srpc_serv_portal(int svc_id)
  66 {
  67         return svc_id < SRPC_FRAMEWORK_SERVICE_MAX_ID ?
  68                SRPC_FRAMEWORK_REQUEST_PORTAL : SRPC_REQUEST_PORTAL;
  69 }
  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         cfs_spin_lock(&srpc_data.rpc_glock);
  77         *cnt = srpc_data.rpc_counters;
  78         cfs_spin_unlock(&srpc_data.rpc_glock);
  79 }
  80
  81 void srpc_set_counters (const srpc_counters_t *cnt)
  82 {
  83         cfs_spin_lock(&srpc_data.rpc_glock);
  84         srpc_data.rpc_counters = *cnt;
  85         cfs_spin_unlock(&srpc_data.rpc_glock);
  86 }
  87
  88 int
  89 srpc_add_bulk_page(srpc_bulk_t *bk, cfs_page_t *pg, int i, int nob)
  90 {
  91         nob = min(nob, (int)CFS_PAGE_SIZE);
  92
  93         LASSERT(nob > 0);
  94         LASSERT(i >= 0 && i < bk->bk_niov);
  95
  96 #ifdef __KERNEL__
  97         bk->bk_iovs[i].kiov_offset = 0;
  98         bk->bk_iovs[i].kiov_page   = pg;
  99         bk->bk_iovs[i].kiov_len    = nob;
 100 #else
 101         LASSERT(bk->bk_pages != NULL);
 102
 103         bk->bk_pages[i] = pg;
 104         bk->bk_iovs[i].iov_len  = nob;
 105         bk->bk_iovs[i].iov_base = cfs_page_address(pg);
 106 #endif
 107         return nob;
 108 }
 109
 110 void
 111 srpc_free_bulk (srpc_bulk_t *bk)
 112 {
 113         int         i;
 114         cfs_page_t *pg;
 115
 116         LASSERT (bk != NULL);
 117 #ifndef __KERNEL__
 118         LASSERT (bk->bk_pages != NULL);
 119 #endif
 120
 121         for (i = 0; i < bk->bk_niov; i++) {
 122 #ifdef __KERNEL__
 123                 pg = bk->bk_iovs[i].kiov_page;
 124 #else
 125                 pg = bk->bk_pages[i];
 126 #endif
 127                 if (pg == NULL) break;
 128
 129                 cfs_free_page(pg);
 130         }
 131
 132 #ifndef __KERNEL__
 133         LIBCFS_FREE(bk->bk_pages, sizeof(cfs_page_t *) * bk->bk_niov);
 134 #endif
 135         LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
 136         return;
 137 }
 138
 139 srpc_bulk_t *
 140 srpc_alloc_bulk(int cpt, unsigned bulk_npg, unsigned bulk_len, int sink)
 141 {
 142         srpc_bulk_t  *bk;
 143         cfs_page_t  **pages;
 144         int           i;
 145
 146         LASSERT(bulk_npg > 0 && bulk_npg <= LNET_MAX_IOV);
 147
 148         LIBCFS_CPT_ALLOC(bk, lnet_cpt_table(), cpt,
 149                          offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 150         if (bk == NULL) {
 151                 CERROR("Can't allocate descriptor for %d pages\n", bulk_npg);
 152                 return NULL;
 153         }
 154
 155         memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 156         bk->bk_sink   = sink;
 157         bk->bk_len    = bulk_len;
 158         bk->bk_niov   = bulk_npg;
 159 #ifndef __KERNEL__
 160         LIBCFS_CPT_ALLOC(pages, lnet_cpt_table(), cpt,
 161                          sizeof(cfs_page_t *) * bulk_npg);
 162         if (pages == NULL) {
 163                 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
 164                 CERROR("Can't allocate page array for %d pages\n", bulk_npg);
 165                 return NULL;
 166         }
 167
 168         memset(pages, 0, sizeof(cfs_page_t *) * bulk_npg);
 169         bk->bk_pages = pages;
 170 #else
 171         UNUSED(pages);
 172 #endif
 173
 174         for (i = 0; i < bulk_npg; i++) {
 175                 cfs_page_t *pg;
 176                 int         nob;
 177
 178                 pg = cfs_page_cpt_alloc(lnet_cpt_table(), cpt, CFS_ALLOC_STD);
 179                 if (pg == NULL) {
 180                         CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
 181                         srpc_free_bulk(bk);
 182                         return NULL;
 183                 }
 184
 185                 nob = srpc_add_bulk_page(bk, pg, i, bulk_len);
 186                 bulk_len -= nob;
 187         }
 188
 189         return bk;
 190 }
 191
 192 static inline __u64
 193 srpc_next_id (void)
 194 {
 195         __u64 id;
 196
 197         cfs_spin_lock(&srpc_data.rpc_glock);
 198         id = srpc_data.rpc_matchbits++;
 199         cfs_spin_unlock(&srpc_data.rpc_glock);
 200         return id;
 201 }
 202
 203 void
 204 srpc_init_server_rpc(struct srpc_server_rpc *rpc,
 205                      struct srpc_service_cd *scd,
 206                      struct srpc_buffer *buffer)
 207 {
 208         memset(rpc, 0, sizeof(*rpc));
 209         swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc,
 210                           srpc_serv_is_framework(scd->scd_svc) ?
 211                           lst_sched_serial : lst_sched_test[scd->scd_cpt]);
 212
 213         rpc->srpc_ev.ev_fired = 1; /* no event expected now */
 214
 215         rpc->srpc_scd      = scd;
 216         rpc->srpc_reqstbuf = buffer;
 217         rpc->srpc_peer     = buffer->buf_peer;
 218         rpc->srpc_self     = buffer->buf_self;
 219         LNetInvalidateHandle(&rpc->srpc_replymdh);
 220 }
 221
 222 static void
 223 srpc_service_fini(struct srpc_service *svc)
 224 {
 225         struct srpc_service_cd  *scd;
 226         struct srpc_server_rpc  *rpc;
 227         struct srpc_buffer      *buf;
 228         cfs_list_t              *q;
 229         int                     i;
 230
 231         if (svc->sv_cpt_data == NULL)
 232                 return;
 233
 234         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 235                 while (1) {
 236                         if (!cfs_list_empty(&scd->scd_buf_posted))
 237                                 q = &scd->scd_buf_posted;
 238                         else if (!cfs_list_empty(&scd->scd_buf_blocked))
 239                                 q = &scd->scd_buf_blocked;
 240                         else
 241                                 break;
 242
 243                         while (!cfs_list_empty(q)) {
 244                                 buf = cfs_list_entry(q->next,
 245                                                      struct srpc_buffer,
 246                                                      buf_list);
 247                                 cfs_list_del(&buf->buf_list);
 248                                 LIBCFS_FREE(buf, sizeof(*buf));
 249                         }
 250                 }
 251
 252                 LASSERT(cfs_list_empty(&scd->scd_rpc_active));
 253
 254                 while (!cfs_list_empty(&scd->scd_rpc_free)) {
 255                         rpc = cfs_list_entry(scd->scd_rpc_free.next,
 256                                              struct srpc_server_rpc,
 257                                              srpc_list);
 258                         cfs_list_del(&rpc->srpc_list);
 259                         LIBCFS_FREE(rpc, sizeof(*rpc));
 260                 }
 261         }
 262
 263         cfs_percpt_free(svc->sv_cpt_data);
 264         svc->sv_cpt_data = NULL;
 265 }
 266
 267 static int
 268 srpc_service_nrpcs(struct srpc_service *svc)
 269 {
 270         int nrpcs = svc->sv_wi_total / svc->sv_ncpts;
 271
 272         return srpc_serv_is_framework(svc) ?
 273                max(nrpcs, SFW_FRWK_WI_MIN) : max(nrpcs, SFW_TEST_WI_MIN);
 274 }
 275
 276 int srpc_add_buffer(struct swi_workitem *wi);
 277
 278 static int
 279 srpc_service_init(struct srpc_service *svc)
 280 {
 281         struct srpc_service_cd  *scd;
 282         struct srpc_server_rpc  *rpc;
 283         int                     nrpcs;
 284         int                     i;
 285         int                     j;
 286
 287         svc->sv_shuttingdown = 0;
 288
 289         svc->sv_cpt_data = cfs_percpt_alloc(lnet_cpt_table(),
 290                                             sizeof(struct srpc_service_cd));
 291         if (svc->sv_cpt_data == NULL)
 292                 return -ENOMEM;
 293
 294         svc->sv_ncpts = srpc_serv_is_framework(svc) ?
 295                         1 : cfs_cpt_number(lnet_cpt_table());
 296         nrpcs = srpc_service_nrpcs(svc);
 297
 298         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 299                 scd->scd_cpt = i;
 300                 scd->scd_svc = svc;
 301                 cfs_spin_lock_init(&scd->scd_lock);
 302                 CFS_INIT_LIST_HEAD(&scd->scd_rpc_free);
 303                 CFS_INIT_LIST_HEAD(&scd->scd_rpc_active);
 304                 CFS_INIT_LIST_HEAD(&scd->scd_buf_posted);
 305                 CFS_INIT_LIST_HEAD(&scd->scd_buf_blocked);
 306
 307                 scd->scd_ev.ev_data = scd;
 308                 scd->scd_ev.ev_type = SRPC_REQUEST_RCVD;
 309
 310                 /* NB: don't use lst_sched_serial for adding buffer,
 311                  * see details in srpc_service_add_buffers() */
 312                 swi_init_workitem(&scd->scd_buf_wi, scd,
 313                                   srpc_add_buffer, lst_sched_test[i]);
 314
 315                 if (i != 0 && srpc_serv_is_framework(svc)) {
 316                         /* NB: framework service only needs srpc_service_cd for
 317                          * one partition, but we allocate for all to make
 318                          * it easier to implement, it will waste a little
 319                          * memory but nobody should care about this */
 320                         continue;
 321                 }
 322
 323                 for (j = 0; j < nrpcs; j++) {
 324                         LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
 325                                          i, sizeof(*rpc));
 326                         if (rpc == NULL) {
 327                                 srpc_service_fini(svc);
 328                                 return -ENOMEM;
 329                         }
 330                         cfs_list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 331                 }
 332         }
 333
 334         return 0;
 335 }
 336
 337 int
 338 srpc_add_service(struct srpc_service *sv)
 339 {
 340         int id = sv->sv_id;
 341
 342         LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
 343
 344         if (srpc_service_init(sv) != 0)
 345                 return -ENOMEM;
 346
 347         cfs_spin_lock(&srpc_data.rpc_glock);
 348
 349         LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
 350
 351         if (srpc_data.rpc_services[id] != NULL) {
 352                 cfs_spin_unlock(&srpc_data.rpc_glock);
 353                 goto failed;
 354         }
 355
 356         srpc_data.rpc_services[id] = sv;
 357         cfs_spin_unlock(&srpc_data.rpc_glock);
 358
 359         CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
 360         return 0;
 361
 362  failed:
 363         srpc_service_fini(sv);
 364         return -EBUSY;
 365 }
 366
 367 int
 368 srpc_remove_service (srpc_service_t *sv)
 369 {
 370         int id = sv->sv_id;
 371
 372         cfs_spin_lock(&srpc_data.rpc_glock);
 373
 374         if (srpc_data.rpc_services[id] != sv) {
 375                 cfs_spin_unlock(&srpc_data.rpc_glock);
 376                 return -ENOENT;
 377         }
 378
 379         srpc_data.rpc_services[id] = NULL;
 380         cfs_spin_unlock(&srpc_data.rpc_glock);
 381         return 0;
 382 }
 383
 384 int
 385 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
 386                        int len, int options, lnet_process_id_t peer,
 387                        lnet_handle_md_t *mdh, srpc_event_t *ev)
 388 {
 389         int              rc;
 390         lnet_md_t        md;
 391         lnet_handle_me_t meh;
 392
 393         rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
 394                           local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
 395         if (rc != 0) {
 396                 CERROR ("LNetMEAttach failed: %d\n", rc);
 397                 LASSERT (rc == -ENOMEM);
 398                 return -ENOMEM;
 399         }
 400
 401         md.threshold = 1;
 402         md.user_ptr  = ev;
 403         md.start     = buf;
 404         md.length    = len;
 405         md.options   = options;
 406         md.eq_handle = srpc_data.rpc_lnet_eq;
 407
 408         rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
 409         if (rc != 0) {
 410                 CERROR ("LNetMDAttach failed: %d\n", rc);
 411                 LASSERT (rc == -ENOMEM);
 412
 413                 rc = LNetMEUnlink(meh);
 414                 LASSERT (rc == 0);
 415                 return -ENOMEM;
 416         }
 417
 418         CDEBUG (D_NET,
 419                 "Posted passive RDMA: peer %s, portal %d, matchbits "LPX64"\n",
 420                 libcfs_id2str(peer), portal, matchbits);
 421         return 0;
 422 }
 423
 424 int
 425 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
 426                       int options, lnet_process_id_t peer, lnet_nid_t self,
 427                       lnet_handle_md_t *mdh, srpc_event_t *ev)
 428 {
 429         int       rc;
 430         lnet_md_t md;
 431
 432         md.user_ptr  = ev;
 433         md.start     = buf;
 434         md.length    = len;
 435         md.eq_handle = srpc_data.rpc_lnet_eq;
 436         md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
 437         md.options   = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
 438
 439         rc = LNetMDBind(md, LNET_UNLINK, mdh);
 440         if (rc != 0) {
 441                 CERROR ("LNetMDBind failed: %d\n", rc);
 442                 LASSERT (rc == -ENOMEM);
 443                 return -ENOMEM;
 444         }
 445
 446         /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
 447          * they're only meaningful for MDs attached to an ME (i.e. passive
 448          * buffers... */
 449         if ((options & LNET_MD_OP_PUT) != 0) {
 450                 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
 451                              portal, matchbits, 0, 0);
 452         } else {
 453                 LASSERT ((options & LNET_MD_OP_GET) != 0);
 454
 455                 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
 456         }
 457
 458         if (rc != 0) {
 459                 CERROR ("LNet%s(%s, %d, "LPD64") failed: %d\n",
 460                         ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
 461                         libcfs_id2str(peer), portal, matchbits, rc);
 462
 463                 /* The forthcoming unlink event will complete this operation
 464                  * with failure, so fall through and return success here.
 465                  */
 466                 rc = LNetMDUnlink(*mdh);
 467                 LASSERT (rc == 0);
 468         } else {
 469                 CDEBUG (D_NET,
 470                         "Posted active RDMA: peer %s, portal %u, matchbits "LPX64"\n",
 471                         libcfs_id2str(peer), portal, matchbits);
 472         }
 473         return 0;
 474 }
 475
 476 int
 477 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
 478                         int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
 479 {
 480         return srpc_post_active_rdma(srpc_serv_portal(service), service,
 481                                      buf, len, LNET_MD_OP_PUT, peer,
 482                                      LNET_NID_ANY, mdh, ev);
 483 }
 484
 485 int
 486 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
 487                          lnet_handle_md_t *mdh, srpc_event_t *ev)
 488 {
 489         lnet_process_id_t any = {0};
 490
 491         any.nid = LNET_NID_ANY;
 492         any.pid = LNET_PID_ANY;
 493
 494         return srpc_post_passive_rdma(srpc_serv_portal(service),
 495                                       local, service, buf, len,
 496                                       LNET_MD_OP_PUT, any, mdh, ev);
 497 }
 498
 499 int
 500 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
 501 {
 502         struct srpc_service     *sv = scd->scd_svc;
 503         struct srpc_msg         *msg = &buf->buf_msg;
 504         int                     rc;
 505
 506         LNetInvalidateHandle(&buf->buf_mdh);
 507         cfs_list_add(&buf->buf_list, &scd->scd_buf_posted);
 508         scd->scd_buf_nposted++;
 509         cfs_spin_unlock(&scd->scd_lock);
 510
 511         rc = srpc_post_passive_rqtbuf(sv->sv_id,
 512                                       !srpc_serv_is_framework(sv),
 513                                       msg, sizeof(*msg), &buf->buf_mdh,
 514                                       &scd->scd_ev);
 515
 516         /* At this point, a RPC (new or delayed) may have arrived in
 517          * msg and its event handler has been called. So we must add
 518          * buf to scd_buf_posted _before_ dropping scd_lock */
 519
 520         cfs_spin_lock(&scd->scd_lock);
 521
 522         if (rc == 0) {
 523                 if (!sv->sv_shuttingdown)
 524                         return 0;
 525
 526                 cfs_spin_unlock(&scd->scd_lock);
 527                 /* srpc_shutdown_service might have tried to unlink me
 528                  * when my buf_mdh was still invalid */
 529                 LNetMDUnlink(buf->buf_mdh);
 530                 cfs_spin_lock(&scd->scd_lock);
 531                 return 0;
 532         }
 533
 534         scd->scd_buf_nposted--;
 535         if (sv->sv_shuttingdown)
 536                 return rc; /* don't allow to change scd_buf_posted */
 537
 538         cfs_list_del(&buf->buf_list);
 539         cfs_spin_unlock(&scd->scd_lock);
 540
 541         LIBCFS_FREE(buf, sizeof(*buf));
 542
 543         cfs_spin_lock(&scd->scd_lock);
 544         return rc;
 545 }
 546
 547 int
 548 srpc_add_buffer(struct swi_workitem *wi)
 549 {
 550         struct srpc_service_cd  *scd = wi->swi_workitem.wi_data;
 551         struct srpc_buffer      *buf;
 552         int                     rc = 0;
 553
 554         /* it's called by workitem scheduler threads, these threads
 555          * should have been set CPT affinity, so buffers will be posted
 556          * on CPT local list of Portal */
 557         cfs_spin_lock(&scd->scd_lock);
 558
 559         while (scd->scd_buf_adjust > 0 &&
 560                !scd->scd_svc->sv_shuttingdown) {
 561                 scd->scd_buf_adjust--; /* consume it */
 562                 scd->scd_buf_posting++;
 563
 564                 cfs_spin_unlock(&scd->scd_lock);
 565
 566                 LIBCFS_ALLOC(buf, sizeof(*buf));
 567                 if (buf == NULL) {
 568                         CERROR("Failed to add new buf to service: %s\n",
 569                                scd->scd_svc->sv_name);
 570                         cfs_spin_lock(&scd->scd_lock);
 571                         rc = -ENOMEM;
 572                         break;
 573                 }
 574
 575                 cfs_spin_lock(&scd->scd_lock);
 576                 if (scd->scd_svc->sv_shuttingdown) {
 577                         cfs_spin_unlock(&scd->scd_lock);
 578                         LIBCFS_FREE(buf, sizeof(*buf));
 579
 580                         cfs_spin_lock(&scd->scd_lock);
 581                         rc = -ESHUTDOWN;
 582                         break;
 583                 }
 584
 585                 rc = srpc_service_post_buffer(scd, buf);
 586                 if (rc != 0)
 587                         break; /* buf has been freed inside */
 588
 589                 LASSERT(scd->scd_buf_posting > 0);
 590                 scd->scd_buf_posting--;
 591                 scd->scd_buf_total++;
 592                 scd->scd_buf_low = MAX(2, scd->scd_buf_total / 4);
 593         }
 594
 595         if (rc != 0) {
 596                 scd->scd_buf_err_stamp = cfs_time_current_sec();
 597                 scd->scd_buf_err = rc;
 598
 599                 LASSERT(scd->scd_buf_posting > 0);
 600                 scd->scd_buf_posting--;
 601         }
 602
 603         cfs_spin_unlock(&scd->scd_lock);
 604         return 0;
 605 }
 606
 607 int
 608 srpc_service_add_buffers(struct srpc_service *sv, int nbuffer)
 609 {
 610         struct srpc_service_cd  *scd;
 611         int                     rc = 0;
 612         int                     i;
 613
 614         LASSERTF(nbuffer > 0, "nbuffer must be positive: %d\n", nbuffer);
 615
 616         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 617                 cfs_spin_lock(&scd->scd_lock);
 618
 619                 scd->scd_buf_err = 0;
 620                 scd->scd_buf_err_stamp = 0;
 621                 scd->scd_buf_posting = 0;
 622                 scd->scd_buf_adjust = nbuffer;
 623                 /* start to post buffers */
 624                 swi_schedule_workitem(&scd->scd_buf_wi);
 625                 cfs_spin_unlock(&scd->scd_lock);
 626
 627                 /* framework service only post buffer for one partition  */
 628                 if (srpc_serv_is_framework(sv))
 629                         break;
 630         }
 631
 632         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 633                 cfs_spin_lock(&scd->scd_lock);
 634                 /*
 635                  * NB: srpc_service_add_buffers() can be called inside
 636                  * thread context of lst_sched_serial, and we don't normally
 637                  * allow to sleep inside thread context of WI scheduler
 638                  * because it will block current scheduler thread from doing
 639                  * anything else, even worse, it could deadlock if it's
 640                  * waiting on result from another WI of the same scheduler.
 641                  * However, it's safe at here because scd_buf_wi is scheduled
 642                  * by thread in a different WI scheduler (lst_sched_test),
 643                  * so we don't have any risk of deadlock, though this could
 644                  * block all WIs pending on lst_sched_serial for a moment
 645                  * which is not good but not fatal.
 646                  */
 647                 lst_wait_until(scd->scd_buf_err != 0 ||
 648                                (scd->scd_buf_adjust == 0 &&
 649                                 scd->scd_buf_posting == 0),
 650                                scd->scd_lock, "waiting for adding buffer\n");
 651
 652                 if (scd->scd_buf_err != 0 && rc == 0)
 653                         rc = scd->scd_buf_err;
 654
 655                 cfs_spin_unlock(&scd->scd_lock);
 656         }
 657
 658         return rc;
 659 }
 660
 661 void
 662 srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer)
 663 {
 664         struct srpc_service_cd  *scd;
 665         int                     num;
 666         int                     i;
 667
 668         LASSERT(!sv->sv_shuttingdown);
 669
 670         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 671                 cfs_spin_lock(&scd->scd_lock);
 672
 673                 num = scd->scd_buf_total + scd->scd_buf_posting;
 674                 scd->scd_buf_adjust -= min(nbuffer, num);
 675
 676                 cfs_spin_unlock(&scd->scd_lock);
 677         }
 678 }
 679
 680 /* returns 1 if sv has finished, otherwise 0 */
 681 int
 682 srpc_finish_service(struct srpc_service *sv)
 683 {
 684         struct srpc_service_cd  *scd;
 685         struct srpc_server_rpc  *rpc;
 686         int                     i;
 687
 688         LASSERT(sv->sv_shuttingdown); /* srpc_shutdown_service called */
 689
 690         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 691                 cfs_spin_lock(&scd->scd_lock);
 692                 if (!swi_deschedule_workitem(&scd->scd_buf_wi))
 693                         return 0;
 694
 695                 if (scd->scd_buf_nposted > 0) {
 696                         CDEBUG(D_NET, "waiting for %d posted buffers to unlink",
 697                                scd->scd_buf_nposted);
 698                         cfs_spin_unlock(&scd->scd_lock);
 699                         return 0;
 700                 }
 701
 702                 if (cfs_list_empty(&scd->scd_rpc_active)) {
 703                         cfs_spin_unlock(&scd->scd_lock);
 704                         continue;
 705                 }
 706
 707                 rpc = cfs_list_entry(scd->scd_rpc_active.next,
 708                                      struct srpc_server_rpc, srpc_list);
 709                 CNETERR("Active RPC %p on shutdown: sv %s, peer %s, "
 710                         "wi %s scheduled %d running %d, "
 711                         "ev fired %d type %d status %d lnet %d\n",
 712                         rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 713                         swi_state2str(rpc->srpc_wi.swi_state),
 714                         rpc->srpc_wi.swi_workitem.wi_scheduled,
 715                         rpc->srpc_wi.swi_workitem.wi_running,
 716                         rpc->srpc_ev.ev_fired, rpc->srpc_ev.ev_type,
 717                         rpc->srpc_ev.ev_status, rpc->srpc_ev.ev_lnet);
 718                 cfs_spin_unlock(&scd->scd_lock);
 719                 return 0;
 720         }
 721
 722         /* no lock needed from now on */
 723         srpc_service_fini(sv);
 724         return 1;
 725 }
 726
 727 /* called with sv->sv_lock held */
 728 void
 729 srpc_service_recycle_buffer(struct srpc_service_cd *scd, srpc_buffer_t *buf)
 730 {
 731         if (!scd->scd_svc->sv_shuttingdown && scd->scd_buf_adjust >= 0) {
 732                 if (srpc_service_post_buffer(scd, buf) != 0) {
 733                         CWARN("Failed to post %s buffer\n",
 734                               scd->scd_svc->sv_name);
 735                 }
 736                 return;
 737         }
 738
 739         /* service is shutting down, or we want to recycle some buffers */
 740         scd->scd_buf_total--;
 741
 742         if (scd->scd_buf_adjust < 0) {
 743                 scd->scd_buf_adjust++;
 744                 if (scd->scd_buf_adjust < 0 &&
 745                     scd->scd_buf_total == 0 && scd->scd_buf_posting == 0) {
 746                         CDEBUG(D_INFO,
 747                                "Try to recyle %d buffers but nothing left\n",
 748                                scd->scd_buf_adjust);
 749                         scd->scd_buf_adjust = 0;
 750                 }
 751         }
 752
 753         cfs_spin_unlock(&scd->scd_lock);
 754         LIBCFS_FREE(buf, sizeof(*buf));
 755         cfs_spin_lock(&scd->scd_lock);
 756 }
 757
 758 void
 759 srpc_abort_service(struct srpc_service *sv)
 760 {
 761         struct srpc_service_cd  *scd;
 762         struct srpc_server_rpc  *rpc;
 763         int                     i;
 764
 765         CDEBUG(D_NET, "Aborting service: id %d, name %s\n",
 766                sv->sv_id, sv->sv_name);
 767
 768         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 769                 cfs_spin_lock(&scd->scd_lock);
 770
 771                 /* schedule in-flight RPCs to notice the abort, NB:
 772                  * racing with incoming RPCs; complete fix should make test
 773                  * RPCs carry session ID in its headers */
 774                 cfs_list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list) {
 775                         rpc->srpc_aborted = 1;
 776                         swi_schedule_workitem(&rpc->srpc_wi);
 777                 }
 778
 779                 cfs_spin_unlock(&scd->scd_lock);
 780         }
 781 }
 782
 783 void
 784 srpc_shutdown_service(srpc_service_t *sv)
 785 {
 786         struct srpc_service_cd  *scd;
 787         struct srpc_server_rpc  *rpc;
 788         srpc_buffer_t           *buf;
 789         int                     i;
 790
 791         CDEBUG(D_NET, "Shutting down service: id %d, name %s\n",
 792                sv->sv_id, sv->sv_name);
 793
 794         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 795                 cfs_spin_lock(&scd->scd_lock);
 796
 797         sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
 798
 799         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 800                 cfs_spin_unlock(&scd->scd_lock);
 801
 802         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 803                 cfs_spin_lock(&scd->scd_lock);
 804
 805                 /* schedule in-flight RPCs to notice the shutdown */
 806                 cfs_list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list)
 807                         swi_schedule_workitem(&rpc->srpc_wi);
 808
 809                 cfs_spin_unlock(&scd->scd_lock);
 810
 811                 /* OK to traverse scd_buf_posted without lock, since no one
 812                  * touches scd_buf_posted now */
 813                 cfs_list_for_each_entry(buf, &scd->scd_buf_posted, buf_list)
 814                         LNetMDUnlink(buf->buf_mdh);
 815         }
 816 }
 817
 818 int
 819 srpc_send_request (srpc_client_rpc_t *rpc)
 820 {
 821         srpc_event_t *ev = &rpc->crpc_reqstev;
 822         int           rc;
 823
 824         ev->ev_fired = 0;
 825         ev->ev_data  = rpc;
 826         ev->ev_type  = SRPC_REQUEST_SENT;
 827
 828         rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
 829                                      &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
 830                                      &rpc->crpc_reqstmdh, ev);
 831         if (rc != 0) {
 832                 LASSERT (rc == -ENOMEM);
 833                 ev->ev_fired = 1;  /* no more event expected */
 834         }
 835         return rc;
 836 }
 837
 838 int
 839 srpc_prepare_reply (srpc_client_rpc_t *rpc)
 840 {
 841         srpc_event_t *ev = &rpc->crpc_replyev;
 842         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
 843         int           rc;
 844
 845         ev->ev_fired = 0;
 846         ev->ev_data  = rpc;
 847         ev->ev_type  = SRPC_REPLY_RCVD;
 848
 849         *id = srpc_next_id();
 850
 851         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 852                                     &rpc->crpc_replymsg, sizeof(srpc_msg_t),
 853                                     LNET_MD_OP_PUT, rpc->crpc_dest,
 854                                     &rpc->crpc_replymdh, ev);
 855         if (rc != 0) {
 856                 LASSERT (rc == -ENOMEM);
 857                 ev->ev_fired = 1;  /* no more event expected */
 858         }
 859         return rc;
 860 }
 861
 862 int
 863 srpc_prepare_bulk (srpc_client_rpc_t *rpc)
 864 {
 865         srpc_bulk_t  *bk = &rpc->crpc_bulk;
 866         srpc_event_t *ev = &rpc->crpc_bulkev;
 867         __u64        *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
 868         int           rc;
 869         int           opt;
 870
 871         LASSERT (bk->bk_niov <= LNET_MAX_IOV);
 872
 873         if (bk->bk_niov == 0) return 0; /* nothing to do */
 874
 875         opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
 876 #ifdef __KERNEL__
 877         opt |= LNET_MD_KIOV;
 878 #else
 879         opt |= LNET_MD_IOVEC;
 880 #endif
 881
 882         ev->ev_fired = 0;
 883         ev->ev_data  = rpc;
 884         ev->ev_type  = SRPC_BULK_REQ_RCVD;
 885
 886         *id = srpc_next_id();
 887
 888         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 889                                     &bk->bk_iovs[0], bk->bk_niov, opt,
 890                                     rpc->crpc_dest, &bk->bk_mdh, ev);
 891         if (rc != 0) {
 892                 LASSERT (rc == -ENOMEM);
 893                 ev->ev_fired = 1;  /* no more event expected */
 894         }
 895         return rc;
 896 }
 897
 898 int
 899 srpc_do_bulk (srpc_server_rpc_t *rpc)
 900 {
 901         srpc_event_t  *ev = &rpc->srpc_ev;
 902         srpc_bulk_t   *bk = rpc->srpc_bulk;
 903         __u64          id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
 904         int            rc;
 905         int            opt;
 906
 907         LASSERT (bk != NULL);
 908
 909         opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
 910 #ifdef __KERNEL__
 911         opt |= LNET_MD_KIOV;
 912 #else
 913         opt |= LNET_MD_IOVEC;
 914 #endif
 915
 916         ev->ev_fired = 0;
 917         ev->ev_data  = rpc;
 918         ev->ev_type  = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
 919
 920         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
 921                                    &bk->bk_iovs[0], bk->bk_niov, opt,
 922                                    rpc->srpc_peer, rpc->srpc_self,
 923                                    &bk->bk_mdh, ev);
 924         if (rc != 0)
 925                 ev->ev_fired = 1;  /* no more event expected */
 926         return rc;
 927 }
 928
 929 /* only called from srpc_handle_rpc */
 930 void
 931 srpc_server_rpc_done(srpc_server_rpc_t *rpc, int status)
 932 {
 933         struct srpc_service_cd  *scd = rpc->srpc_scd;
 934         struct srpc_service     *sv  = scd->scd_svc;
 935         srpc_buffer_t           *buffer;
 936
 937         LASSERT (status != 0 || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
 938
 939         rpc->srpc_status = status;
 940
 941         CDEBUG_LIMIT (status == 0 ? D_NET : D_NETERROR,
 942                 "Server RPC %p done: service %s, peer %s, status %s:%d\n",
 943                 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 944                 swi_state2str(rpc->srpc_wi.swi_state), status);
 945
 946         if (status != 0) {
 947                 cfs_spin_lock(&srpc_data.rpc_glock);
 948                 srpc_data.rpc_counters.rpcs_dropped++;
 949                 cfs_spin_unlock(&srpc_data.rpc_glock);
 950         }
 951
 952         if (rpc->srpc_done != NULL)
 953                 (*rpc->srpc_done) (rpc);
 954         LASSERT (rpc->srpc_bulk == NULL);
 955
 956         cfs_spin_lock(&scd->scd_lock);
 957
 958         if (rpc->srpc_reqstbuf != NULL) {
 959                 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
 960                  * sv won't go away for scd_rpc_active must not be empty */
 961                 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
 962                 rpc->srpc_reqstbuf = NULL;
 963         }
 964
 965         cfs_list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
 966
 967         /*
 968          * No one can schedule me now since:
 969          * - I'm not on scd_rpc_active.
 970          * - all LNet events have been fired.
 971          * Cancel pending schedules and prevent future schedule attempts:
 972          */
 973         LASSERT(rpc->srpc_ev.ev_fired);
 974         swi_exit_workitem(&rpc->srpc_wi);
 975
 976         if (!sv->sv_shuttingdown && !cfs_list_empty(&scd->scd_buf_blocked)) {
 977                 buffer = cfs_list_entry(scd->scd_buf_blocked.next,
 978                                         srpc_buffer_t, buf_list);
 979                 cfs_list_del(&buffer->buf_list);
 980
 981                 srpc_init_server_rpc(rpc, scd, buffer);
 982                 cfs_list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
 983                 swi_schedule_workitem(&rpc->srpc_wi);
 984         } else {
 985                 cfs_list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 986         }
 987
 988         cfs_spin_unlock(&scd->scd_lock);
 989         return;
 990 }
 991
 992 /* handles an incoming RPC */
 993 int
 994 srpc_handle_rpc(swi_workitem_t *wi)
 995 {
 996         struct srpc_server_rpc  *rpc = wi->swi_workitem.wi_data;
 997         struct srpc_service_cd  *scd = rpc->srpc_scd;
 998         struct srpc_service     *sv = scd->scd_svc;
 999         srpc_event_t            *ev = &rpc->srpc_ev;
1000         int                     rc = 0;
1001
1002         LASSERT(wi == &rpc->srpc_wi);
1003
1004         cfs_spin_lock(&scd->scd_lock);
1005
1006         if (sv->sv_shuttingdown || rpc->srpc_aborted) {
1007                 cfs_spin_unlock(&scd->scd_lock);
1008
1009                 if (rpc->srpc_bulk != NULL)
1010                         LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
1011                 LNetMDUnlink(rpc->srpc_replymdh);
1012
1013                 if (ev->ev_fired) { /* no more event, OK to finish */
1014                         srpc_server_rpc_done(rpc, -ESHUTDOWN);
1015                         return 1;
1016                 }
1017                 return 0;
1018         }
1019
1020         cfs_spin_unlock(&scd->scd_lock);
1021
1022         switch (wi->swi_state) {
1023         default:
1024                 LBUG ();
1025         case SWI_STATE_NEWBORN: {
1026                 srpc_msg_t           *msg;
1027                 srpc_generic_reply_t *reply;
1028
1029                 msg = &rpc->srpc_reqstbuf->buf_msg;
1030                 reply = &rpc->srpc_replymsg.msg_body.reply;
1031
1032                 if (msg->msg_magic == 0) {
1033                         /* moaned already in srpc_lnet_ev_handler */
1034                         srpc_server_rpc_done(rpc, EBADMSG);
1035                         return 1;
1036                 }
1037
1038                 srpc_unpack_msg_hdr(msg);
1039                 if (msg->msg_version != SRPC_MSG_VERSION) {
1040                         CWARN("Version mismatch: %u, %u expected, from %s\n",
1041                               msg->msg_version, SRPC_MSG_VERSION,
1042                               libcfs_id2str(rpc->srpc_peer));
1043                         reply->status = EPROTO;
1044                         /* drop through and send reply */
1045                 } else {
1046                         reply->status = 0;
1047                         rc = (*sv->sv_handler)(rpc);
1048                         LASSERT(reply->status == 0 || !rpc->srpc_bulk);
1049                         if (rc != 0) {
1050                                 srpc_server_rpc_done(rpc, rc);
1051                                 return 1;
1052                         }
1053                 }
1054
1055                 wi->swi_state = SWI_STATE_BULK_STARTED;
1056
1057                 if (rpc->srpc_bulk != NULL) {
1058                         rc = srpc_do_bulk(rpc);
1059                         if (rc == 0)
1060                                 return 0; /* wait for bulk */
1061
1062                         LASSERT (ev->ev_fired);
1063                         ev->ev_status = rc;
1064                 }
1065         }
1066         case SWI_STATE_BULK_STARTED:
1067                 LASSERT (rpc->srpc_bulk == NULL || ev->ev_fired);
1068
1069                 if (rpc->srpc_bulk != NULL) {
1070                         rc = ev->ev_status;
1071
1072                         if (sv->sv_bulk_ready != NULL)
1073                                 rc = (*sv->sv_bulk_ready) (rpc, rc);
1074
1075                         if (rc != 0) {
1076                                 srpc_server_rpc_done(rpc, rc);
1077                                 return 1;
1078                         }
1079                 }
1080
1081                 wi->swi_state = SWI_STATE_REPLY_SUBMITTED;
1082                 rc = srpc_send_reply(rpc);
1083                 if (rc == 0)
1084                         return 0; /* wait for reply */
1085                 srpc_server_rpc_done(rpc, rc);
1086                 return 1;
1087
1088         case SWI_STATE_REPLY_SUBMITTED:
1089                 if (!ev->ev_fired) {
1090                         CERROR("RPC %p: bulk %p, service %d\n",
1091                                rpc, rpc->srpc_bulk, sv->sv_id);
1092                         CERROR("Event: status %d, type %d, lnet %d\n",
1093                                ev->ev_status, ev->ev_type, ev->ev_lnet);
1094                         LASSERT (ev->ev_fired);
1095                 }
1096
1097                 wi->swi_state = SWI_STATE_DONE;
1098                 srpc_server_rpc_done(rpc, ev->ev_status);
1099                 return 1;
1100         }
1101
1102         return 0;
1103 }
1104
1105 void
1106 srpc_client_rpc_expired (void *data)
1107 {
1108         srpc_client_rpc_t *rpc = data;
1109
1110         CWARN ("Client RPC expired: service %d, peer %s, timeout %d.\n",
1111                rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1112                rpc->crpc_timeout);
1113
1114         cfs_spin_lock(&rpc->crpc_lock);
1115
1116         rpc->crpc_timeout = 0;
1117         srpc_abort_rpc(rpc, -ETIMEDOUT);
1118
1119         cfs_spin_unlock(&rpc->crpc_lock);
1120
1121         cfs_spin_lock(&srpc_data.rpc_glock);
1122         srpc_data.rpc_counters.rpcs_expired++;
1123         cfs_spin_unlock(&srpc_data.rpc_glock);
1124         return;
1125 }
1126
1127 inline void
1128 srpc_add_client_rpc_timer (srpc_client_rpc_t *rpc)
1129 {
1130         stt_timer_t *timer = &rpc->crpc_timer;
1131
1132         if (rpc->crpc_timeout == 0) return;
1133
1134         CFS_INIT_LIST_HEAD(&timer->stt_list);
1135         timer->stt_data    = rpc;
1136         timer->stt_func    = srpc_client_rpc_expired;
1137         timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1138                                           cfs_time_current_sec());
1139         stt_add_timer(timer);
1140         return;
1141 }
1142
1143 /*
1144  * Called with rpc->crpc_lock held.
1145  *
1146  * Upon exit the RPC expiry timer is not queued and the handler is not
1147  * running on any CPU. */
1148 void
1149 srpc_del_client_rpc_timer (srpc_client_rpc_t *rpc)
1150 {
1151         /* timer not planted or already exploded */
1152         if (rpc->crpc_timeout == 0) return;
1153
1154         /* timer sucessfully defused */
1155         if (stt_del_timer(&rpc->crpc_timer)) return;
1156
1157 #ifdef __KERNEL__
1158         /* timer detonated, wait for it to explode */
1159         while (rpc->crpc_timeout != 0) {
1160                 cfs_spin_unlock(&rpc->crpc_lock);
1161
1162                 cfs_schedule();
1163
1164                 cfs_spin_lock(&rpc->crpc_lock);
1165         }
1166 #else
1167         LBUG(); /* impossible in single-threaded runtime */
1168 #endif
1169         return;
1170 }
1171
1172 void
1173 srpc_client_rpc_done (srpc_client_rpc_t *rpc, int status)
1174 {
1175         swi_workitem_t *wi = &rpc->crpc_wi;
1176
1177         LASSERT (status != 0 || wi->swi_state == SWI_STATE_DONE);
1178
1179         cfs_spin_lock(&rpc->crpc_lock);
1180
1181         rpc->crpc_closed = 1;
1182         if (rpc->crpc_status == 0)
1183                 rpc->crpc_status = status;
1184
1185         srpc_del_client_rpc_timer(rpc);
1186
1187         CDEBUG_LIMIT ((status == 0) ? D_NET : D_NETERROR,
1188                 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1189                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1190                 swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1191
1192         /*
1193          * No one can schedule me now since:
1194          * - RPC timer has been defused.
1195          * - all LNet events have been fired.
1196          * - crpc_closed has been set, preventing srpc_abort_rpc from
1197          *   scheduling me.
1198          * Cancel pending schedules and prevent future schedule attempts:
1199          */
1200         LASSERT (!srpc_event_pending(rpc));
1201         swi_exit_workitem(wi);
1202
1203         cfs_spin_unlock(&rpc->crpc_lock);
1204
1205         (*rpc->crpc_done)(rpc);
1206         return;
1207 }
1208
1209 /* sends an outgoing RPC */
1210 int
1211 srpc_send_rpc (swi_workitem_t *wi)
1212 {
1213         int                rc = 0;
1214         srpc_client_rpc_t *rpc = wi->swi_workitem.wi_data;
1215         srpc_msg_t        *reply = &rpc->crpc_replymsg;
1216         int                do_bulk = rpc->crpc_bulk.bk_niov > 0;
1217
1218         LASSERT (rpc != NULL);
1219         LASSERT (wi == &rpc->crpc_wi);
1220
1221         cfs_spin_lock(&rpc->crpc_lock);
1222
1223         if (rpc->crpc_aborted) {
1224                 cfs_spin_unlock(&rpc->crpc_lock);
1225                 goto abort;
1226         }
1227
1228         cfs_spin_unlock(&rpc->crpc_lock);
1229
1230         switch (wi->swi_state) {
1231         default:
1232                 LBUG ();
1233         case SWI_STATE_NEWBORN:
1234                 LASSERT (!srpc_event_pending(rpc));
1235
1236                 rc = srpc_prepare_reply(rpc);
1237                 if (rc != 0) {
1238                         srpc_client_rpc_done(rpc, rc);
1239                         return 1;
1240                 }
1241
1242                 rc = srpc_prepare_bulk(rpc);
1243                 if (rc != 0) break;
1244
1245                 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1246                 rc = srpc_send_request(rpc);
1247                 break;
1248
1249         case SWI_STATE_REQUEST_SUBMITTED:
1250                 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1251                  * order; however, they're processed in a strict order:
1252                  * rqt, rpy, and bulk. */
1253                 if (!rpc->crpc_reqstev.ev_fired) break;
1254
1255                 rc = rpc->crpc_reqstev.ev_status;
1256                 if (rc != 0) break;
1257
1258                 wi->swi_state = SWI_STATE_REQUEST_SENT;
1259                 /* perhaps more events, fall thru */
1260         case SWI_STATE_REQUEST_SENT: {
1261                 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1262
1263                 if (!rpc->crpc_replyev.ev_fired) break;
1264
1265                 rc = rpc->crpc_replyev.ev_status;
1266                 if (rc != 0) break;
1267
1268                 srpc_unpack_msg_hdr(reply);
1269                 if (reply->msg_type != type ||
1270                     reply->msg_magic != SRPC_MSG_MAGIC) {
1271                         CWARN ("Bad message from %s: type %u (%d expected),"
1272                                " magic %u (%d expected).\n",
1273                                libcfs_id2str(rpc->crpc_dest),
1274                                reply->msg_type, type,
1275                                reply->msg_magic, SRPC_MSG_MAGIC);
1276                         rc = -EBADMSG;
1277                         break;
1278                 }
1279
1280                 if (do_bulk && reply->msg_body.reply.status != 0) {
1281                         CWARN ("Remote error %d at %s, unlink bulk buffer in "
1282                                "case peer didn't initiate bulk transfer\n",
1283                                reply->msg_body.reply.status,
1284                                libcfs_id2str(rpc->crpc_dest));
1285                         LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1286                 }
1287
1288                 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1289         }
1290         case SWI_STATE_REPLY_RECEIVED:
1291                 if (do_bulk && !rpc->crpc_bulkev.ev_fired) break;
1292
1293                 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1294
1295                 /* Bulk buffer was unlinked due to remote error. Clear error
1296                  * since reply buffer still contains valid data.
1297                  * NB rpc->crpc_done shouldn't look into bulk data in case of
1298                  * remote error. */
1299                 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1300                     rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1301                         rc = 0;
1302
1303                 wi->swi_state = SWI_STATE_DONE;
1304                 srpc_client_rpc_done(rpc, rc);
1305                 return 1;
1306         }
1307
1308         if (rc != 0) {
1309                 cfs_spin_lock(&rpc->crpc_lock);
1310                 srpc_abort_rpc(rpc, rc);
1311                 cfs_spin_unlock(&rpc->crpc_lock);
1312         }
1313
1314 abort:
1315         if (rpc->crpc_aborted) {
1316                 LNetMDUnlink(rpc->crpc_reqstmdh);
1317                 LNetMDUnlink(rpc->crpc_replymdh);
1318                 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1319
1320                 if (!srpc_event_pending(rpc)) {
1321                         srpc_client_rpc_done(rpc, -EINTR);
1322                         return 1;
1323                 }
1324         }
1325         return 0;
1326 }
1327
1328 srpc_client_rpc_t *
1329 srpc_create_client_rpc (lnet_process_id_t peer, int service,
1330                         int nbulkiov, int bulklen,
1331                         void (*rpc_done)(srpc_client_rpc_t *),
1332                         void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1333 {
1334         srpc_client_rpc_t *rpc;
1335
1336         LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1337                                    crpc_bulk.bk_iovs[nbulkiov]));
1338         if (rpc == NULL)
1339                 return NULL;
1340
1341         srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1342                              bulklen, rpc_done, rpc_fini, priv);
1343         return rpc;
1344 }
1345
1346 /* called with rpc->crpc_lock held */
1347 void
1348 srpc_abort_rpc (srpc_client_rpc_t *rpc, int why)
1349 {
1350         LASSERT (why != 0);
1351
1352         if (rpc->crpc_aborted || /* already aborted */
1353             rpc->crpc_closed)    /* callback imminent */
1354                 return;
1355
1356         CDEBUG (D_NET,
1357                 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1358                 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1359                 swi_state2str(rpc->crpc_wi.swi_state), why);
1360
1361         rpc->crpc_aborted = 1;
1362         rpc->crpc_status  = why;
1363         swi_schedule_workitem(&rpc->crpc_wi);
1364         return;
1365 }
1366
1367 /* called with rpc->crpc_lock held */
1368 void
1369 srpc_post_rpc (srpc_client_rpc_t *rpc)
1370 {
1371         LASSERT (!rpc->crpc_aborted);
1372         LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1373
1374         CDEBUG (D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1375                 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1376                 rpc->crpc_timeout);
1377
1378         srpc_add_client_rpc_timer(rpc);
1379         swi_schedule_workitem(&rpc->crpc_wi);
1380         return;
1381 }
1382
1383
1384 int
1385 srpc_send_reply(struct srpc_server_rpc *rpc)
1386 {
1387         srpc_event_t            *ev = &rpc->srpc_ev;
1388         struct srpc_msg         *msg = &rpc->srpc_replymsg;
1389         struct srpc_buffer      *buffer = rpc->srpc_reqstbuf;
1390         struct srpc_service_cd  *scd = rpc->srpc_scd;
1391         struct srpc_service     *sv = scd->scd_svc;
1392         __u64                   rpyid;
1393         int                     rc;
1394
1395         LASSERT(buffer != NULL);
1396         rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1397
1398         cfs_spin_lock(&scd->scd_lock);
1399
1400         if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1401                 /* Repost buffer before replying since test client
1402                  * might send me another RPC once it gets the reply */
1403                 if (srpc_service_post_buffer(scd, buffer) != 0)
1404                         CWARN("Failed to repost %s buffer\n", sv->sv_name);
1405                 rpc->srpc_reqstbuf = NULL;
1406         }
1407
1408         cfs_spin_unlock(&scd->scd_lock);
1409
1410         ev->ev_fired = 0;
1411         ev->ev_data  = rpc;
1412         ev->ev_type  = SRPC_REPLY_SENT;
1413
1414         msg->msg_magic   = SRPC_MSG_MAGIC;
1415         msg->msg_version = SRPC_MSG_VERSION;
1416         msg->msg_type    = srpc_service2reply(sv->sv_id);
1417
1418         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1419                                    sizeof(*msg), LNET_MD_OP_PUT,
1420                                    rpc->srpc_peer, rpc->srpc_self,
1421                                    &rpc->srpc_replymdh, ev);
1422         if (rc != 0)
1423                 ev->ev_fired = 1;  /* no more event expected */
1424         return rc;
1425 }
1426
1427 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1428 void
1429 srpc_lnet_ev_handler(lnet_event_t *ev)
1430 {
1431         struct srpc_service_cd  *scd;
1432         srpc_event_t      *rpcev = ev->md.user_ptr;
1433         srpc_client_rpc_t *crpc;
1434         srpc_server_rpc_t *srpc;
1435         srpc_buffer_t     *buffer;
1436         srpc_service_t    *sv;
1437         srpc_msg_t        *msg;
1438         srpc_msg_type_t    type;
1439
1440         LASSERT (!cfs_in_interrupt());
1441
1442         if (ev->status != 0) {
1443                 cfs_spin_lock(&srpc_data.rpc_glock);
1444                 srpc_data.rpc_counters.errors++;
1445                 cfs_spin_unlock(&srpc_data.rpc_glock);
1446         }
1447
1448         rpcev->ev_lnet = ev->type;
1449
1450         switch (rpcev->ev_type) {
1451         default:
1452                 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1453                        rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1454                 LBUG ();
1455         case SRPC_REQUEST_SENT:
1456                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1457                         cfs_spin_lock(&srpc_data.rpc_glock);
1458                         srpc_data.rpc_counters.rpcs_sent++;
1459                         cfs_spin_unlock(&srpc_data.rpc_glock);
1460                 }
1461         case SRPC_REPLY_RCVD:
1462         case SRPC_BULK_REQ_RCVD:
1463                 crpc = rpcev->ev_data;
1464
1465                 if (rpcev != &crpc->crpc_reqstev &&
1466                     rpcev != &crpc->crpc_replyev &&
1467                     rpcev != &crpc->crpc_bulkev) {
1468                         CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1469                                rpcev, crpc, &crpc->crpc_reqstev,
1470                                &crpc->crpc_replyev, &crpc->crpc_bulkev);
1471                         CERROR("Bad event: status %d, type %d, lnet %d\n",
1472                                rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1473                         LBUG ();
1474                 }
1475
1476                 cfs_spin_lock(&crpc->crpc_lock);
1477
1478                 LASSERT (rpcev->ev_fired == 0);
1479                 rpcev->ev_fired  = 1;
1480                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1481                                                 -EINTR : ev->status;
1482                 swi_schedule_workitem(&crpc->crpc_wi);
1483
1484                 cfs_spin_unlock(&crpc->crpc_lock);
1485                 break;
1486
1487         case SRPC_REQUEST_RCVD:
1488                 scd = rpcev->ev_data;
1489                 sv = scd->scd_svc;
1490
1491                 LASSERT(rpcev == &scd->scd_ev);
1492
1493                 cfs_spin_lock(&scd->scd_lock);
1494
1495                 LASSERT (ev->unlinked);
1496                 LASSERT (ev->type == LNET_EVENT_PUT ||
1497                          ev->type == LNET_EVENT_UNLINK);
1498                 LASSERT (ev->type != LNET_EVENT_UNLINK ||
1499                          sv->sv_shuttingdown);
1500
1501                 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1502                 buffer->buf_peer = ev->initiator;
1503                 buffer->buf_self = ev->target.nid;
1504
1505                 LASSERT(scd->scd_buf_nposted > 0);
1506                 scd->scd_buf_nposted--;
1507
1508                 if (sv->sv_shuttingdown) {
1509                         /* Leave buffer on scd->scd_buf_nposted since
1510                          * srpc_finish_service needs to traverse it. */
1511                         cfs_spin_unlock(&scd->scd_lock);
1512                         break;
1513                 }
1514
1515                 if (scd->scd_buf_err_stamp != 0 &&
1516                     scd->scd_buf_err_stamp < cfs_time_current_sec()) {
1517                         /* re-enable adding buffer */
1518                         scd->scd_buf_err_stamp = 0;
1519                         scd->scd_buf_err = 0;
1520                 }
1521
1522                 if (scd->scd_buf_err == 0 && /* adding buffer is enabled */
1523                     scd->scd_buf_adjust == 0 &&
1524                     scd->scd_buf_nposted < scd->scd_buf_low) {
1525                         scd->scd_buf_adjust = MAX(scd->scd_buf_total / 2,
1526                                                   SFW_TEST_WI_MIN);
1527                         swi_schedule_workitem(&scd->scd_buf_wi);
1528                 }
1529
1530                 cfs_list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1531                 msg = &buffer->buf_msg;
1532                 type = srpc_service2request(sv->sv_id);
1533
1534                 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1535                     (msg->msg_type != type &&
1536                      msg->msg_type != __swab32(type)) ||
1537                     (msg->msg_magic != SRPC_MSG_MAGIC &&
1538                      msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1539                         CERROR ("Dropping RPC (%s) from %s: "
1540                                 "status %d mlength %d type %u magic %u.\n",
1541                                 sv->sv_name, libcfs_id2str(ev->initiator),
1542                                 ev->status, ev->mlength,
1543                                 msg->msg_type, msg->msg_magic);
1544
1545                         /* NB can't call srpc_service_recycle_buffer here since
1546                          * it may call LNetM[DE]Attach. The invalid magic tells
1547                          * srpc_handle_rpc to drop this RPC */
1548                         msg->msg_magic = 0;
1549                 }
1550
1551                 if (!cfs_list_empty(&scd->scd_rpc_free)) {
1552                         srpc = cfs_list_entry(scd->scd_rpc_free.next,
1553                                               struct srpc_server_rpc,
1554                                               srpc_list);
1555                         cfs_list_del(&srpc->srpc_list);
1556
1557                         srpc_init_server_rpc(srpc, scd, buffer);
1558                         cfs_list_add_tail(&srpc->srpc_list,
1559                                           &scd->scd_rpc_active);
1560                         swi_schedule_workitem(&srpc->srpc_wi);
1561                 } else {
1562                         cfs_list_add_tail(&buffer->buf_list,
1563                                           &scd->scd_buf_blocked);
1564                 }
1565
1566                 cfs_spin_unlock(&scd->scd_lock);
1567
1568                 cfs_spin_lock(&srpc_data.rpc_glock);
1569                 srpc_data.rpc_counters.rpcs_rcvd++;
1570                 cfs_spin_unlock(&srpc_data.rpc_glock);
1571                 break;
1572
1573         case SRPC_BULK_GET_RPLD:
1574                 LASSERT (ev->type == LNET_EVENT_SEND ||
1575                          ev->type == LNET_EVENT_REPLY ||
1576                          ev->type == LNET_EVENT_UNLINK);
1577
1578                 if (!ev->unlinked)
1579                         break; /* wait for final event */
1580
1581         case SRPC_BULK_PUT_SENT:
1582                 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1583                         cfs_spin_lock(&srpc_data.rpc_glock);
1584
1585                         if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1586                                 srpc_data.rpc_counters.bulk_get += ev->mlength;
1587                         else
1588                                 srpc_data.rpc_counters.bulk_put += ev->mlength;
1589
1590                         cfs_spin_unlock(&srpc_data.rpc_glock);
1591                 }
1592         case SRPC_REPLY_SENT:
1593                 srpc = rpcev->ev_data;
1594                 scd  = srpc->srpc_scd;
1595
1596                 LASSERT(rpcev == &srpc->srpc_ev);
1597
1598                 cfs_spin_lock(&scd->scd_lock);
1599
1600                 rpcev->ev_fired  = 1;
1601                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1602                                    -EINTR : ev->status;
1603                 swi_schedule_workitem(&srpc->srpc_wi);
1604
1605                 cfs_spin_unlock(&scd->scd_lock);
1606                 break;
1607         }
1608 }
1609
1610 #ifndef __KERNEL__
1611
1612 int
1613 srpc_check_event (int timeout)
1614 {
1615         lnet_event_t ev;
1616         int          rc;
1617         int          i;
1618
1619         rc = LNetEQPoll(&srpc_data.rpc_lnet_eq, 1,
1620                         timeout * 1000, &ev, &i);
1621         if (rc == 0) return 0;
1622
1623         LASSERT (rc == -EOVERFLOW || rc == 1);
1624
1625         /* We can't affort to miss any events... */
1626         if (rc == -EOVERFLOW) {
1627                 CERROR ("Dropped an event!!!\n");
1628                 abort();
1629         }
1630
1631         srpc_lnet_ev_handler(&ev);
1632         return 1;
1633 }
1634
1635 #endif
1636
1637 int
1638 srpc_startup (void)
1639 {
1640         int rc;
1641
1642         memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1643         cfs_spin_lock_init(&srpc_data.rpc_glock);
1644
1645         /* 1 second pause to avoid timestamp reuse */
1646         cfs_pause(cfs_time_seconds(1));
1647         srpc_data.rpc_matchbits = ((__u64) cfs_time_current_sec()) << 48;
1648
1649         srpc_data.rpc_state = SRPC_STATE_NONE;
1650
1651 #ifdef __KERNEL__
1652         rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1653 #else
1654         if (the_lnet.ln_server_mode_flag)
1655                 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1656         else
1657                 rc = LNetNIInit(getpid() | LNET_PID_USERFLAG);
1658 #endif
1659         if (rc < 0) {
1660                 CERROR ("LNetNIInit() has failed: %d\n", rc);
1661                 return rc;
1662         }
1663
1664         srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1665
1666         LNetInvalidateHandle(&srpc_data.rpc_lnet_eq);
1667 #ifdef __KERNEL__
1668         rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1669 #else
1670         rc = LNetEQAlloc(10240, LNET_EQ_HANDLER_NONE, &srpc_data.rpc_lnet_eq);
1671 #endif
1672         if (rc != 0) {
1673                 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1674                 goto bail;
1675         }
1676
1677         rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1678         LASSERT(rc == 0);
1679         rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1680         LASSERT(rc == 0);
1681
1682         srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1683
1684         rc = stt_startup();
1685
1686 bail:
1687         if (rc != 0)
1688                 srpc_shutdown();
1689         else
1690                 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1691
1692         return rc;
1693 }
1694
1695 void
1696 srpc_shutdown (void)
1697 {
1698         int i;
1699         int rc;
1700         int state;
1701
1702         state = srpc_data.rpc_state;
1703         srpc_data.rpc_state = SRPC_STATE_STOPPING;
1704
1705         switch (state) {
1706         default:
1707                 LBUG ();
1708         case SRPC_STATE_RUNNING:
1709                 cfs_spin_lock(&srpc_data.rpc_glock);
1710
1711                 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1712                         srpc_service_t *sv = srpc_data.rpc_services[i];
1713
1714                         LASSERTF (sv == NULL,
1715                                   "service not empty: id %d, name %s\n",
1716                                   i, sv->sv_name);
1717                 }
1718
1719                 cfs_spin_unlock(&srpc_data.rpc_glock);
1720
1721                 stt_shutdown();
1722
1723         case SRPC_STATE_EQ_INIT:
1724                 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1725                 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1726                 LASSERT (rc == 0);
1727                 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1728                 LASSERT (rc == 0); /* the EQ should have no user by now */
1729
1730         case SRPC_STATE_NI_INIT:
1731                 LNetNIFini();
1732         }
1733
1734         return;
1735 }