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