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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2012, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  *
  32  * lnet/selftest/rpc.c
  33  *
  34  * Author: Isaac Huang <isaac@clusterfs.com>
  35  *
  36  * 2012-05-13: Liang Zhen <liang@whamcloud.com>
  37  * - percpt data for service to improve smp performance
  38  * - code cleanup
  39  */
  40
  41 #define DEBUG_SUBSYSTEM S_LNET
  42
  43 #include "selftest.h"
  44
  45 enum srpc_state {
  46         SRPC_STATE_NONE,
  47         SRPC_STATE_NI_INIT,
  48         SRPC_STATE_EQ_INIT,
  49         SRPC_STATE_RUNNING,
  50         SRPC_STATE_STOPPING,
  51 };
  52
  53 static struct smoketest_rpc {
  54         spinlock_t       rpc_glock;     /* global lock */
  55         struct srpc_service     *rpc_services[SRPC_SERVICE_MAX_ID + 1];
  56         struct lnet_handle_eq    rpc_lnet_eq;   /* _the_ LNet event queue */
  57         enum srpc_state  rpc_state;
  58         struct srpc_counters     rpc_counters;
  59         __u64            rpc_matchbits; /* matchbits counter */
  60 } srpc_data;
  61
  62 static inline int
  63 srpc_serv_portal(int svc_id)
  64 {
  65         return svc_id < SRPC_FRAMEWORK_SERVICE_MAX_ID ?
  66                SRPC_FRAMEWORK_REQUEST_PORTAL : SRPC_REQUEST_PORTAL;
  67 }
  68
  69 /* forward ref's */
  70 int srpc_handle_rpc(struct swi_workitem *wi);
  71
  72 void srpc_get_counters(struct srpc_counters *cnt)
  73 {
  74         spin_lock(&srpc_data.rpc_glock);
  75         *cnt = srpc_data.rpc_counters;
  76         spin_unlock(&srpc_data.rpc_glock);
  77 }
  78
  79 void srpc_set_counters(const struct srpc_counters *cnt)
  80 {
  81         spin_lock(&srpc_data.rpc_glock);
  82         srpc_data.rpc_counters = *cnt;
  83         spin_unlock(&srpc_data.rpc_glock);
  84 }
  85
  86 static int
  87 srpc_add_bulk_page(struct srpc_bulk *bk, struct page *pg, int i, int off,
  88                    int nob)
  89 {
  90         LASSERT(off < PAGE_SIZE);
  91         LASSERT(nob > 0 && nob <= PAGE_SIZE);
  92
  93         bk->bk_iovs[i].bv_offset = off;
  94         bk->bk_iovs[i].bv_page = pg;
  95         bk->bk_iovs[i].bv_len = nob;
  96         return nob;
  97 }
  98
  99 void
 100 srpc_free_bulk(struct srpc_bulk *bk)
 101 {
 102         int i;
 103         struct page *pg;
 104
 105         LASSERT(bk);
 106
 107         for (i = 0; i < bk->bk_niov; i++) {
 108                 pg = bk->bk_iovs[i].bv_page;
 109                 if (!pg)
 110                         break;
 111
 112                 __free_page(pg);
 113         }
 114
 115         LIBCFS_FREE(bk, offsetof(struct srpc_bulk, bk_iovs[bk->bk_niov]));
 116 }
 117
 118 struct srpc_bulk *
 119 srpc_alloc_bulk(int cpt, unsigned int bulk_off, unsigned int bulk_npg,
 120                 unsigned int bulk_len, int sink)
 121 {
 122         struct srpc_bulk *bk;
 123         int i;
 124
 125         LASSERT(bulk_npg > 0 && bulk_npg <= LNET_MAX_IOV);
 126
 127         LIBCFS_CPT_ALLOC(bk, lnet_cpt_table(), cpt,
 128                          offsetof(struct srpc_bulk, bk_iovs[bulk_npg]));
 129         if (!bk) {
 130                 CERROR("Can't allocate descriptor for %d pages\n", bulk_npg);
 131                 return NULL;
 132         }
 133
 134         memset(bk, 0, offsetof(struct srpc_bulk, bk_iovs[bulk_npg]));
 135         bk->bk_sink = sink;
 136         bk->bk_len = bulk_len;
 137         bk->bk_niov = bulk_npg;
 138
 139         for (i = 0; i < bulk_npg; i++) {
 140                 struct page *pg;
 141                 int nob;
 142
 143                 pg = alloc_pages_node(cfs_cpt_spread_node(lnet_cpt_table(), cpt),
 144                                       GFP_KERNEL, 0);
 145                 if (!pg) {
 146                         CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
 147                         srpc_free_bulk(bk);
 148                         return NULL;
 149                 }
 150
 151                 nob = min_t(unsigned int, bulk_off + bulk_len, PAGE_SIZE) -
 152                       bulk_off;
 153                 srpc_add_bulk_page(bk, pg, i, bulk_off, nob);
 154                 bulk_len -= nob;
 155                 bulk_off = 0;
 156         }
 157
 158         return bk;
 159 }
 160
 161 static inline __u64
 162 srpc_next_id(void)
 163 {
 164         __u64 id;
 165
 166         spin_lock(&srpc_data.rpc_glock);
 167         id = srpc_data.rpc_matchbits++;
 168         spin_unlock(&srpc_data.rpc_glock);
 169         return id;
 170 }
 171
 172 static void
 173 srpc_init_server_rpc(struct srpc_server_rpc *rpc,
 174                      struct srpc_service_cd *scd,
 175                      struct srpc_buffer *buffer)
 176 {
 177         memset(rpc, 0, sizeof(*rpc));
 178         swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc,
 179                           srpc_serv_is_framework(scd->scd_svc) ?
 180                           lst_sched_serial : lst_sched_test[scd->scd_cpt]);
 181
 182         rpc->srpc_ev.ev_fired = 1; /* no event expected now */
 183
 184         rpc->srpc_scd = scd;
 185         rpc->srpc_reqstbuf = buffer;
 186         rpc->srpc_peer = buffer->buf_peer;
 187         rpc->srpc_self = buffer->buf_self;
 188         LNetInvalidateMDHandle(&rpc->srpc_replymdh);
 189 }
 190
 191 static void
 192 srpc_service_fini(struct srpc_service *svc)
 193 {
 194         struct srpc_service_cd *scd;
 195         struct srpc_server_rpc *rpc;
 196         struct srpc_buffer *buf;
 197         struct list_head *q;
 198         int i;
 199
 200         if (!svc->sv_cpt_data)
 201                 return;
 202
 203         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 204                 while (1) {
 205                         if (!list_empty(&scd->scd_buf_posted))
 206                                 q = &scd->scd_buf_posted;
 207                         else if (!list_empty(&scd->scd_buf_blocked))
 208                                 q = &scd->scd_buf_blocked;
 209                         else
 210                                 break;
 211
 212                         while (!list_empty(q)) {
 213                                 buf = list_entry(q->next, struct srpc_buffer,
 214                                                  buf_list);
 215                                 list_del(&buf->buf_list);
 216                                 LIBCFS_FREE(buf, sizeof(*buf));
 217                         }
 218                 }
 219
 220                 LASSERT(list_empty(&scd->scd_rpc_active));
 221
 222                 while (!list_empty(&scd->scd_rpc_free)) {
 223                         rpc = list_entry(scd->scd_rpc_free.next,
 224                                          struct srpc_server_rpc,
 225                                          srpc_list);
 226                         list_del(&rpc->srpc_list);
 227                         LIBCFS_FREE(rpc, sizeof(*rpc));
 228                 }
 229         }
 230
 231         cfs_percpt_free(svc->sv_cpt_data);
 232         svc->sv_cpt_data = NULL;
 233 }
 234
 235 static int
 236 srpc_service_nrpcs(struct srpc_service *svc)
 237 {
 238         int nrpcs = svc->sv_wi_total / svc->sv_ncpts;
 239
 240         return srpc_serv_is_framework(svc) ?
 241                max(nrpcs, SFW_FRWK_WI_MIN) : max(nrpcs, SFW_TEST_WI_MIN);
 242 }
 243
 244 int srpc_add_buffer(struct swi_workitem *wi);
 245
 246 static int
 247 srpc_service_init(struct srpc_service *svc)
 248 {
 249         struct srpc_service_cd *scd;
 250         struct srpc_server_rpc *rpc;
 251         int nrpcs;
 252         int i;
 253         int j;
 254
 255         svc->sv_shuttingdown = 0;
 256
 257         svc->sv_cpt_data = cfs_percpt_alloc(lnet_cpt_table(),
 258                                             sizeof(**svc->sv_cpt_data));
 259         if (!svc->sv_cpt_data)
 260                 return -ENOMEM;
 261
 262         svc->sv_ncpts = srpc_serv_is_framework(svc) ?
 263                         1 : cfs_cpt_number(lnet_cpt_table());
 264         nrpcs = srpc_service_nrpcs(svc);
 265
 266         cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
 267                 scd->scd_cpt = i;
 268                 scd->scd_svc = svc;
 269                 spin_lock_init(&scd->scd_lock);
 270                 INIT_LIST_HEAD(&scd->scd_rpc_free);
 271                 INIT_LIST_HEAD(&scd->scd_rpc_active);
 272                 INIT_LIST_HEAD(&scd->scd_buf_posted);
 273                 INIT_LIST_HEAD(&scd->scd_buf_blocked);
 274
 275                 scd->scd_ev.ev_data = scd;
 276                 scd->scd_ev.ev_type = SRPC_REQUEST_RCVD;
 277
 278                 /*
 279                  * NB: don't use lst_sched_serial for adding buffer,
 280                  * see details in srpc_service_add_buffers()
 281                  */
 282                 swi_init_workitem(&scd->scd_buf_wi, scd,
 283                                   srpc_add_buffer, lst_sched_test[i]);
 284
 285                 if (i && srpc_serv_is_framework(svc)) {
 286                         /*
 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                          */
 292                         continue;
 293                 }
 294
 295                 for (j = 0; j < nrpcs; j++) {
 296                         LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
 297                                          i, sizeof(*rpc));
 298                         if (!rpc) {
 299                                 srpc_service_fini(svc);
 300                                 return -ENOMEM;
 301                         }
 302                         list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 303                 }
 304         }
 305
 306         return 0;
 307 }
 308
 309 int
 310 srpc_add_service(struct srpc_service *sv)
 311 {
 312         int id = sv->sv_id;
 313
 314         LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
 315
 316         if (srpc_service_init(sv))
 317                 return -ENOMEM;
 318
 319         spin_lock(&srpc_data.rpc_glock);
 320
 321         LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
 322
 323         if (srpc_data.rpc_services[id]) {
 324                 spin_unlock(&srpc_data.rpc_glock);
 325                 goto failed;
 326         }
 327
 328         srpc_data.rpc_services[id] = sv;
 329         spin_unlock(&srpc_data.rpc_glock);
 330
 331         CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
 332         return 0;
 333
 334  failed:
 335         srpc_service_fini(sv);
 336         return -EBUSY;
 337 }
 338
 339 int
 340 srpc_remove_service(struct srpc_service *sv)
 341 {
 342         int id = sv->sv_id;
 343
 344         spin_lock(&srpc_data.rpc_glock);
 345
 346         if (srpc_data.rpc_services[id] != sv) {
 347                 spin_unlock(&srpc_data.rpc_glock);
 348                 return -ENOENT;
 349         }
 350
 351         srpc_data.rpc_services[id] = NULL;
 352         spin_unlock(&srpc_data.rpc_glock);
 353         return 0;
 354 }
 355
 356 static int
 357 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
 358                        int len, int options, struct lnet_process_id peer,
 359                        struct lnet_handle_md *mdh, struct srpc_event *ev)
 360 {
 361         int rc;
 362         struct lnet_md md;
 363         struct lnet_handle_me meh;
 364
 365         rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
 366                           local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
 367         if (rc) {
 368                 CERROR("LNetMEAttach failed: %d\n", rc);
 369                 LASSERT(rc == -ENOMEM);
 370                 return -ENOMEM;
 371         }
 372
 373         md.threshold = 1;
 374         md.user_ptr = ev;
 375         md.start = buf;
 376         md.length = len;
 377         md.options = options;
 378         md.eq_handle = srpc_data.rpc_lnet_eq;
 379
 380         rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
 381         if (rc) {
 382                 CERROR("LNetMDAttach failed: %d\n", rc);
 383                 LASSERT(rc == -ENOMEM);
 384
 385                 rc = LNetMEUnlink(meh);
 386                 LASSERT(!rc);
 387                 return -ENOMEM;
 388         }
 389
 390         CDEBUG(D_NET, "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, struct lnet_process_id peer,
 398                       lnet_nid_t self, struct lnet_handle_md *mdh,
 399                       struct srpc_event *ev)
 400 {
 401         int rc;
 402         struct lnet_md md;
 403
 404         md.user_ptr = ev;
 405         md.start = buf;
 406         md.length = len;
 407         md.eq_handle = srpc_data.rpc_lnet_eq;
 408         md.threshold = options & LNET_MD_OP_GET ? 2 : 1;
 409         md.options = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
 410
 411         rc = LNetMDBind(md, LNET_UNLINK, mdh);
 412         if (rc) {
 413                 CERROR("LNetMDBind failed: %d\n", rc);
 414                 LASSERT(rc == -ENOMEM);
 415                 return -ENOMEM;
 416         }
 417
 418         /*
 419          * this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
 420          * they're only meaningful for MDs attached to an ME (i.e. passive
 421          * buffers...
 422          */
 423         if (options & LNET_MD_OP_PUT) {
 424                 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
 425                              portal, matchbits, 0, 0);
 426         } else {
 427                 LASSERT(options & LNET_MD_OP_GET);
 428
 429                 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
 430         }
 431
 432         if (rc) {
 433                 CERROR("LNet%s(%s, %d, %lld) failed: %d\n",
 434                        options & LNET_MD_OP_PUT ? "Put" : "Get",
 435                        libcfs_id2str(peer), portal, matchbits, rc);
 436
 437                 /*
 438                  * The forthcoming unlink event will complete this operation
 439                  * with failure, so fall through and return success here.
 440                  */
 441                 rc = LNetMDUnlink(*mdh);
 442                 LASSERT(!rc);
 443         } else {
 444                 CDEBUG(D_NET, "Posted active RDMA: peer %s, portal %u, matchbits %#llx\n",
 445                        libcfs_id2str(peer), portal, matchbits);
 446         }
 447         return 0;
 448 }
 449
 450 static int
 451 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
 452                          struct lnet_handle_md *mdh, struct srpc_event *ev)
 453 {
 454         struct lnet_process_id any = { 0 };
 455
 456         any.nid = LNET_NID_ANY;
 457         any.pid = LNET_PID_ANY;
 458
 459         return srpc_post_passive_rdma(srpc_serv_portal(service),
 460                                       local, service, buf, len,
 461                                       LNET_MD_OP_PUT, any, mdh, ev);
 462 }
 463
 464 static int
 465 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
 466 __must_hold(&scd->scd_lock)
 467 {
 468         struct srpc_service *sv = scd->scd_svc;
 469         struct srpc_msg *msg = &buf->buf_msg;
 470         int rc;
 471
 472         LNetInvalidateMDHandle(&buf->buf_mdh);
 473         list_add(&buf->buf_list, &scd->scd_buf_posted);
 474         scd->scd_buf_nposted++;
 475         spin_unlock(&scd->scd_lock);
 476
 477         rc = srpc_post_passive_rqtbuf(sv->sv_id,
 478                                       !srpc_serv_is_framework(sv),
 479                                       msg, sizeof(*msg), &buf->buf_mdh,
 480                                       &scd->scd_ev);
 481
 482         /*
 483          * At this point, a RPC (new or delayed) may have arrived in
 484          * msg and its event handler has been called. So we must add
 485          * buf to scd_buf_posted _before_ dropping scd_lock
 486          */
 487         spin_lock(&scd->scd_lock);
 488
 489         if (!rc) {
 490                 if (!sv->sv_shuttingdown)
 491                         return 0;
 492
 493                 spin_unlock(&scd->scd_lock);
 494                 /*
 495                  * srpc_shutdown_service might have tried to unlink me
 496                  * when my buf_mdh was still invalid
 497                  */
 498                 LNetMDUnlink(buf->buf_mdh);
 499                 spin_lock(&scd->scd_lock);
 500                 return 0;
 501         }
 502
 503         scd->scd_buf_nposted--;
 504         if (sv->sv_shuttingdown)
 505                 return rc; /* don't allow to change scd_buf_posted */
 506
 507         list_del(&buf->buf_list);
 508         spin_unlock(&scd->scd_lock);
 509
 510         LIBCFS_FREE(buf, sizeof(*buf));
 511
 512         spin_lock(&scd->scd_lock);
 513         return rc;
 514 }
 515
 516 int
 517 srpc_add_buffer(struct swi_workitem *wi)
 518 {
 519         struct srpc_service_cd *scd = wi->swi_workitem.wi_data;
 520         struct srpc_buffer *buf;
 521         int rc = 0;
 522
 523         /*
 524          * it's called by workitem scheduler threads, these threads
 525          * should have been set CPT affinity, so buffers will be posted
 526          * on CPT local list of Portal
 527          */
 528         spin_lock(&scd->scd_lock);
 529
 530         while (scd->scd_buf_adjust > 0 &&
 531                !scd->scd_svc->sv_shuttingdown) {
 532                 scd->scd_buf_adjust--; /* consume it */
 533                 scd->scd_buf_posting++;
 534
 535                 spin_unlock(&scd->scd_lock);
 536
 537                 LIBCFS_ALLOC(buf, sizeof(*buf));
 538                 if (!buf) {
 539                         CERROR("Failed to add new buf to service: %s\n",
 540                                scd->scd_svc->sv_name);
 541                         spin_lock(&scd->scd_lock);
 542                         rc = -ENOMEM;
 543                         break;
 544                 }
 545
 546                 spin_lock(&scd->scd_lock);
 547                 if (scd->scd_svc->sv_shuttingdown) {
 548                         spin_unlock(&scd->scd_lock);
 549                         LIBCFS_FREE(buf, sizeof(*buf));
 550
 551                         spin_lock(&scd->scd_lock);
 552                         rc = -ESHUTDOWN;
 553                         break;
 554                 }
 555
 556                 rc = srpc_service_post_buffer(scd, buf);
 557                 if (rc)
 558                         break; /* buf has been freed inside */
 559
 560                 LASSERT(scd->scd_buf_posting > 0);
 561                 scd->scd_buf_posting--;
 562                 scd->scd_buf_total++;
 563                 scd->scd_buf_low = max(2, scd->scd_buf_total / 4);
 564         }
 565
 566         if (rc) {
 567                 scd->scd_buf_err_stamp = ktime_get_real_seconds();
 568                 scd->scd_buf_err = rc;
 569
 570                 LASSERT(scd->scd_buf_posting > 0);
 571                 scd->scd_buf_posting--;
 572         }
 573
 574         spin_unlock(&scd->scd_lock);
 575         return 0;
 576 }
 577
 578 int
 579 srpc_service_add_buffers(struct srpc_service *sv, int nbuffer)
 580 {
 581         struct srpc_service_cd *scd;
 582         int rc = 0;
 583         int i;
 584
 585         LASSERTF(nbuffer > 0, "nbuffer must be positive: %d\n", nbuffer);
 586
 587         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 588                 spin_lock(&scd->scd_lock);
 589
 590                 scd->scd_buf_err = 0;
 591                 scd->scd_buf_err_stamp = 0;
 592                 scd->scd_buf_posting = 0;
 593                 scd->scd_buf_adjust = nbuffer;
 594                 /* start to post buffers */
 595                 swi_schedule_workitem(&scd->scd_buf_wi);
 596                 spin_unlock(&scd->scd_lock);
 597
 598                 /* framework service only post buffer for one partition  */
 599                 if (srpc_serv_is_framework(sv))
 600                         break;
 601         }
 602
 603         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 604                 spin_lock(&scd->scd_lock);
 605                 /*
 606                  * NB: srpc_service_add_buffers() can be called inside
 607                  * thread context of lst_sched_serial, and we don't normally
 608                  * allow to sleep inside thread context of WI scheduler
 609                  * because it will block current scheduler thread from doing
 610                  * anything else, even worse, it could deadlock if it's
 611                  * waiting on result from another WI of the same scheduler.
 612                  * However, it's safe at here because scd_buf_wi is scheduled
 613                  * by thread in a different WI scheduler (lst_sched_test),
 614                  * so we don't have any risk of deadlock, though this could
 615                  * block all WIs pending on lst_sched_serial for a moment
 616                  * which is not good but not fatal.
 617                  */
 618                 lst_wait_until(scd->scd_buf_err ||
 619                                (!scd->scd_buf_adjust &&
 620                                 !scd->scd_buf_posting),
 621                                scd->scd_lock, "waiting for adding buffer\n");
 622
 623                 if (scd->scd_buf_err && !rc)
 624                         rc = scd->scd_buf_err;
 625
 626                 spin_unlock(&scd->scd_lock);
 627         }
 628
 629         return rc;
 630 }
 631
 632 void
 633 srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer)
 634 {
 635         struct srpc_service_cd *scd;
 636         int num;
 637         int i;
 638
 639         LASSERT(!sv->sv_shuttingdown);
 640
 641         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 642                 spin_lock(&scd->scd_lock);
 643
 644                 num = scd->scd_buf_total + scd->scd_buf_posting;
 645                 scd->scd_buf_adjust -= min(nbuffer, num);
 646
 647                 spin_unlock(&scd->scd_lock);
 648         }
 649 }
 650
 651 /* returns 1 if sv has finished, otherwise 0 */
 652 int
 653 srpc_finish_service(struct srpc_service *sv)
 654 {
 655         struct srpc_service_cd *scd;
 656         struct srpc_server_rpc *rpc;
 657         int i;
 658
 659         LASSERT(sv->sv_shuttingdown); /* srpc_shutdown_service called */
 660
 661         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 662                 spin_lock(&scd->scd_lock);
 663                 if (!swi_deschedule_workitem(&scd->scd_buf_wi)) {
 664                         spin_unlock(&scd->scd_lock);
 665                         return 0;
 666                 }
 667
 668                 if (scd->scd_buf_nposted > 0) {
 669                         CDEBUG(D_NET, "waiting for %d posted buffers to unlink\n",
 670                                scd->scd_buf_nposted);
 671                         spin_unlock(&scd->scd_lock);
 672                         return 0;
 673                 }
 674
 675                 if (list_empty(&scd->scd_rpc_active)) {
 676                         spin_unlock(&scd->scd_lock);
 677                         continue;
 678                 }
 679
 680                 rpc = list_entry(scd->scd_rpc_active.next,
 681                                  struct srpc_server_rpc, srpc_list);
 682                 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",
 683                         rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 684                         swi_state2str(rpc->srpc_wi.swi_state),
 685                         rpc->srpc_wi.swi_workitem.wi_scheduled,
 686                         rpc->srpc_wi.swi_workitem.wi_running,
 687                         rpc->srpc_ev.ev_fired, rpc->srpc_ev.ev_type,
 688                         rpc->srpc_ev.ev_status, rpc->srpc_ev.ev_lnet);
 689                 spin_unlock(&scd->scd_lock);
 690                 return 0;
 691         }
 692
 693         /* no lock needed from now on */
 694         srpc_service_fini(sv);
 695         return 1;
 696 }
 697
 698 /* called with sv->sv_lock held */
 699 static void
 700 srpc_service_recycle_buffer(struct srpc_service_cd *scd,
 701                             struct srpc_buffer *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)) {
 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 && !scd->scd_buf_posting) {
 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                 /*
 745                  * schedule in-flight RPCs to notice the abort, NB:
 746                  * racing with incoming RPCs; complete fix should make test
 747                  * RPCs carry session ID in its headers
 748                  */
 749                 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list) {
 750                         rpc->srpc_aborted = 1;
 751                         swi_schedule_workitem(&rpc->srpc_wi);
 752                 }
 753
 754                 spin_unlock(&scd->scd_lock);
 755         }
 756 }
 757
 758 void
 759 srpc_shutdown_service(struct srpc_service *sv)
 760 {
 761         struct srpc_service_cd *scd;
 762         struct srpc_server_rpc *rpc;
 763         struct srpc_buffer *buf;
 764         int i;
 765
 766         CDEBUG(D_NET, "Shutting down service: id %d, name %s\n",
 767                sv->sv_id, sv->sv_name);
 768
 769         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 770                 spin_lock(&scd->scd_lock);
 771
 772         sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
 773
 774         cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
 775                 spin_unlock(&scd->scd_lock);
 776
 777         cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
 778                 spin_lock(&scd->scd_lock);
 779
 780                 /* schedule in-flight RPCs to notice the shutdown */
 781                 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list)
 782                         swi_schedule_workitem(&rpc->srpc_wi);
 783
 784                 spin_unlock(&scd->scd_lock);
 785
 786                 /*
 787                  * OK to traverse scd_buf_posted without lock, since no one
 788                  * touches scd_buf_posted now
 789                  */
 790                 list_for_each_entry(buf, &scd->scd_buf_posted, buf_list)
 791                         LNetMDUnlink(buf->buf_mdh);
 792         }
 793 }
 794
 795 static int
 796 srpc_send_request(struct srpc_client_rpc *rpc)
 797 {
 798         struct srpc_event *ev = &rpc->crpc_reqstev;
 799         int rc;
 800
 801         ev->ev_fired = 0;
 802         ev->ev_data = rpc;
 803         ev->ev_type = SRPC_REQUEST_SENT;
 804
 805          rc = srpc_post_active_rdma(srpc_serv_portal(rpc->crpc_service),
 806                                     rpc->crpc_service, &rpc->crpc_reqstmsg,
 807                                     sizeof(struct srpc_msg), LNET_MD_OP_PUT,
 808                                     rpc->crpc_dest, LNET_NID_ANY,
 809                                     &rpc->crpc_reqstmdh, ev);
 810         if (rc) {
 811                 LASSERT(rc == -ENOMEM);
 812                 ev->ev_fired = 1;  /* no more event expected */
 813         }
 814         return rc;
 815 }
 816
 817 static int
 818 srpc_prepare_reply(struct srpc_client_rpc *rpc)
 819 {
 820         struct srpc_event *ev = &rpc->crpc_replyev;
 821         __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
 822         int rc;
 823
 824         ev->ev_fired = 0;
 825         ev->ev_data = rpc;
 826         ev->ev_type = SRPC_REPLY_RCVD;
 827
 828         *id = srpc_next_id();
 829
 830         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 831                                     &rpc->crpc_replymsg,
 832                                     sizeof(struct srpc_msg),
 833                                     LNET_MD_OP_PUT, rpc->crpc_dest,
 834                                     &rpc->crpc_replymdh, ev);
 835         if (rc) {
 836                 LASSERT(rc == -ENOMEM);
 837                 ev->ev_fired = 1;  /* no more event expected */
 838         }
 839         return rc;
 840 }
 841
 842 static int
 843 srpc_prepare_bulk(struct srpc_client_rpc *rpc)
 844 {
 845         struct srpc_bulk *bk = &rpc->crpc_bulk;
 846         struct srpc_event *ev = &rpc->crpc_bulkev;
 847         __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
 848         int rc;
 849         int opt;
 850
 851         LASSERT(bk->bk_niov <= LNET_MAX_IOV);
 852
 853         if (!bk->bk_niov)
 854                 return 0; /* nothing to do */
 855
 856         opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
 857         opt |= LNET_MD_KIOV;
 858
 859         ev->ev_fired = 0;
 860         ev->ev_data = rpc;
 861         ev->ev_type = SRPC_BULK_REQ_RCVD;
 862
 863         *id = srpc_next_id();
 864
 865         rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
 866                                     &bk->bk_iovs[0], bk->bk_niov, opt,
 867                                     rpc->crpc_dest, &bk->bk_mdh, ev);
 868         if (rc) {
 869                 LASSERT(rc == -ENOMEM);
 870                 ev->ev_fired = 1;  /* no more event expected */
 871         }
 872         return rc;
 873 }
 874
 875 static int
 876 srpc_do_bulk(struct srpc_server_rpc *rpc)
 877 {
 878         struct srpc_event *ev = &rpc->srpc_ev;
 879         struct srpc_bulk *bk = rpc->srpc_bulk;
 880         __u64 id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
 881         int rc;
 882         int opt;
 883
 884         LASSERT(bk);
 885
 886         opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
 887         opt |= LNET_MD_KIOV;
 888
 889         ev->ev_fired = 0;
 890         ev->ev_data = rpc;
 891         ev->ev_type = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
 892
 893         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
 894                                    &bk->bk_iovs[0], bk->bk_niov, opt,
 895                                    rpc->srpc_peer, rpc->srpc_self,
 896                                    &bk->bk_mdh, ev);
 897         if (rc)
 898                 ev->ev_fired = 1;  /* no more event expected */
 899         return rc;
 900 }
 901
 902 /* only called from srpc_handle_rpc */
 903 static void
 904 srpc_server_rpc_done(struct srpc_server_rpc *rpc, int status)
 905 {
 906         struct srpc_service_cd *scd = rpc->srpc_scd;
 907         struct srpc_service *sv = scd->scd_svc;
 908         struct srpc_buffer *buffer;
 909
 910         LASSERT(status || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
 911
 912         rpc->srpc_status = status;
 913
 914         CDEBUG_LIMIT(!status ? D_NET : D_NETERROR,
 915                      "Server RPC %p done: service %s, peer %s, status %s:%d\n",
 916                      rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
 917                      swi_state2str(rpc->srpc_wi.swi_state), status);
 918
 919         if (status) {
 920                 spin_lock(&srpc_data.rpc_glock);
 921                 srpc_data.rpc_counters.rpcs_dropped++;
 922                 spin_unlock(&srpc_data.rpc_glock);
 923         }
 924
 925         if (rpc->srpc_done)
 926                 (*rpc->srpc_done) (rpc);
 927         LASSERT(!rpc->srpc_bulk);
 928
 929         spin_lock(&scd->scd_lock);
 930
 931         if (rpc->srpc_reqstbuf) {
 932                 /*
 933                  * NB might drop sv_lock in srpc_service_recycle_buffer, but
 934                  * sv won't go away for scd_rpc_active must not be empty
 935                  */
 936                 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
 937                 rpc->srpc_reqstbuf = NULL;
 938         }
 939
 940         list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
 941
 942         /*
 943          * No one can schedule me now since:
 944          * - I'm not on scd_rpc_active.
 945          * - all LNet events have been fired.
 946          * Cancel pending schedules and prevent future schedule attempts:
 947          */
 948         LASSERT(rpc->srpc_ev.ev_fired);
 949         swi_exit_workitem(&rpc->srpc_wi);
 950
 951         if (!sv->sv_shuttingdown && !list_empty(&scd->scd_buf_blocked)) {
 952                 buffer = list_entry(scd->scd_buf_blocked.next,
 953                                     struct srpc_buffer, buf_list);
 954                 list_del(&buffer->buf_list);
 955
 956                 srpc_init_server_rpc(rpc, scd, buffer);
 957                 list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
 958                 swi_schedule_workitem(&rpc->srpc_wi);
 959         } else {
 960                 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
 961         }
 962
 963         spin_unlock(&scd->scd_lock);
 964 }
 965
 966 /* handles an incoming RPC */
 967 int
 968 srpc_handle_rpc(struct swi_workitem *wi)
 969 {
 970         struct srpc_server_rpc *rpc = wi->swi_workitem.wi_data;
 971         struct srpc_service_cd *scd = rpc->srpc_scd;
 972         struct srpc_service *sv = scd->scd_svc;
 973         struct srpc_event *ev = &rpc->srpc_ev;
 974         int rc = 0;
 975
 976         LASSERT(wi == &rpc->srpc_wi);
 977
 978         spin_lock(&scd->scd_lock);
 979
 980         if (sv->sv_shuttingdown || rpc->srpc_aborted) {
 981                 spin_unlock(&scd->scd_lock);
 982
 983                 if (rpc->srpc_bulk)
 984                         LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
 985                 LNetMDUnlink(rpc->srpc_replymdh);
 986
 987                 if (ev->ev_fired) { /* no more event, OK to finish */
 988                         srpc_server_rpc_done(rpc, -ESHUTDOWN);
 989                         return 1;
 990                 }
 991                 return 0;
 992         }
 993
 994         spin_unlock(&scd->scd_lock);
 995
 996         switch (wi->swi_state) {
 997         default:
 998                 LBUG();
 999         case SWI_STATE_NEWBORN: {
1000                 struct srpc_msg *msg;
1001                 struct srpc_generic_reply *reply;
1002
1003                 msg = &rpc->srpc_reqstbuf->buf_msg;
1004                 reply = &rpc->srpc_replymsg.msg_body.reply;
1005
1006                 if (!msg->msg_magic) {
1007                         /* moaned already in srpc_lnet_ev_handler */
1008                         srpc_server_rpc_done(rpc, EBADMSG);
1009                         return 1;
1010                 }
1011
1012                 srpc_unpack_msg_hdr(msg);
1013                 if (msg->msg_version != SRPC_MSG_VERSION) {
1014                         CWARN("Version mismatch: %u, %u expected, from %s\n",
1015                               msg->msg_version, SRPC_MSG_VERSION,
1016                               libcfs_id2str(rpc->srpc_peer));
1017                         reply->status = EPROTO;
1018                         /* drop through and send reply */
1019                 } else {
1020                         reply->status = 0;
1021                         rc = (*sv->sv_handler)(rpc);
1022                         LASSERT(!reply->status || !rpc->srpc_bulk);
1023                         if (rc) {
1024                                 srpc_server_rpc_done(rpc, rc);
1025                                 return 1;
1026                         }
1027                 }
1028
1029                 wi->swi_state = SWI_STATE_BULK_STARTED;
1030
1031                 if (rpc->srpc_bulk) {
1032                         rc = srpc_do_bulk(rpc);
1033                         if (!rc)
1034                                 return 0; /* wait for bulk */
1035
1036                         LASSERT(ev->ev_fired);
1037                         ev->ev_status = rc;
1038                 }
1039         }
1040         case SWI_STATE_BULK_STARTED:
1041                 LASSERT(!rpc->srpc_bulk || ev->ev_fired);
1042
1043                 if (rpc->srpc_bulk) {
1044                         rc = ev->ev_status;
1045
1046                         if (sv->sv_bulk_ready)
1047                                 rc = (*sv->sv_bulk_ready) (rpc, rc);
1048
1049                         if (rc) {
1050                                 srpc_server_rpc_done(rpc, rc);
1051                                 return 1;
1052                         }
1053                 }
1054
1055                 wi->swi_state = SWI_STATE_REPLY_SUBMITTED;
1056                 rc = srpc_send_reply(rpc);
1057                 if (!rc)
1058                         return 0; /* wait for reply */
1059                 srpc_server_rpc_done(rpc, rc);
1060                 return 1;
1061
1062         case SWI_STATE_REPLY_SUBMITTED:
1063                 if (!ev->ev_fired) {
1064                         CERROR("RPC %p: bulk %p, service %d\n",
1065                                rpc, rpc->srpc_bulk, sv->sv_id);
1066                         CERROR("Event: status %d, type %d, lnet %d\n",
1067                                ev->ev_status, ev->ev_type, ev->ev_lnet);
1068                         LASSERT(ev->ev_fired);
1069                 }
1070
1071                 wi->swi_state = SWI_STATE_DONE;
1072                 srpc_server_rpc_done(rpc, ev->ev_status);
1073                 return 1;
1074         }
1075
1076         return 0;
1077 }
1078
1079 static void
1080 srpc_client_rpc_expired(void *data)
1081 {
1082         struct srpc_client_rpc *rpc = data;
1083
1084         CWARN("Client RPC expired: service %d, peer %s, timeout %d.\n",
1085               rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1086               rpc->crpc_timeout);
1087
1088         spin_lock(&rpc->crpc_lock);
1089
1090         rpc->crpc_timeout = 0;
1091         srpc_abort_rpc(rpc, -ETIMEDOUT);
1092
1093         spin_unlock(&rpc->crpc_lock);
1094
1095         spin_lock(&srpc_data.rpc_glock);
1096         srpc_data.rpc_counters.rpcs_expired++;
1097         spin_unlock(&srpc_data.rpc_glock);
1098 }
1099
1100 static void
1101 srpc_add_client_rpc_timer(struct srpc_client_rpc *rpc)
1102 {
1103         struct stt_timer *timer = &rpc->crpc_timer;
1104
1105         if (!rpc->crpc_timeout)
1106                 return;
1107
1108         INIT_LIST_HEAD(&timer->stt_list);
1109         timer->stt_data = rpc;
1110         timer->stt_func = srpc_client_rpc_expired;
1111         timer->stt_expires = ktime_get_real_seconds() + rpc->crpc_timeout;
1112         stt_add_timer(timer);
1113 }
1114
1115 /*
1116  * Called with rpc->crpc_lock held.
1117  *
1118  * Upon exit the RPC expiry timer is not queued and the handler is not
1119  * running on any CPU.
1120  */
1121 static void
1122 srpc_del_client_rpc_timer(struct srpc_client_rpc *rpc)
1123 {
1124         /* timer not planted or already exploded */
1125         if (!rpc->crpc_timeout)
1126                 return;
1127
1128         /* timer successfully defused */
1129         if (stt_del_timer(&rpc->crpc_timer))
1130                 return;
1131
1132         /* timer detonated, wait for it to explode */
1133         while (rpc->crpc_timeout) {
1134                 spin_unlock(&rpc->crpc_lock);
1135
1136                 schedule();
1137
1138                 spin_lock(&rpc->crpc_lock);
1139         }
1140 }
1141
1142 static void
1143 srpc_client_rpc_done(struct srpc_client_rpc *rpc, int status)
1144 {
1145         struct swi_workitem *wi = &rpc->crpc_wi;
1146
1147         LASSERT(status || wi->swi_state == SWI_STATE_DONE);
1148
1149         spin_lock(&rpc->crpc_lock);
1150
1151         rpc->crpc_closed = 1;
1152         if (!rpc->crpc_status)
1153                 rpc->crpc_status = status;
1154
1155         srpc_del_client_rpc_timer(rpc);
1156
1157         CDEBUG_LIMIT(!status ? D_NET : D_NETERROR,
1158                      "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1159                      rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1160                      swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1161
1162         /*
1163          * No one can schedule me now since:
1164          * - RPC timer has been defused.
1165          * - all LNet events have been fired.
1166          * - crpc_closed has been set, preventing srpc_abort_rpc from
1167          *   scheduling me.
1168          * Cancel pending schedules and prevent future schedule attempts:
1169          */
1170         LASSERT(!srpc_event_pending(rpc));
1171         swi_exit_workitem(wi);
1172
1173         spin_unlock(&rpc->crpc_lock);
1174
1175         (*rpc->crpc_done)(rpc);
1176 }
1177
1178 /* sends an outgoing RPC */
1179 int
1180 srpc_send_rpc(struct swi_workitem *wi)
1181 {
1182         int rc = 0;
1183         struct srpc_client_rpc *rpc;
1184         struct srpc_msg *reply;
1185         int do_bulk;
1186
1187         LASSERT(wi);
1188
1189         rpc = wi->swi_workitem.wi_data;
1190
1191         LASSERT(rpc);
1192         LASSERT(wi == &rpc->crpc_wi);
1193
1194         reply = &rpc->crpc_replymsg;
1195         do_bulk = rpc->crpc_bulk.bk_niov > 0;
1196
1197         spin_lock(&rpc->crpc_lock);
1198
1199         if (rpc->crpc_aborted) {
1200                 spin_unlock(&rpc->crpc_lock);
1201                 goto abort;
1202         }
1203
1204         spin_unlock(&rpc->crpc_lock);
1205
1206         switch (wi->swi_state) {
1207         default:
1208                 LBUG();
1209         case SWI_STATE_NEWBORN:
1210                 LASSERT(!srpc_event_pending(rpc));
1211
1212                 rc = srpc_prepare_reply(rpc);
1213                 if (rc) {
1214                         srpc_client_rpc_done(rpc, rc);
1215                         return 1;
1216                 }
1217
1218                 rc = srpc_prepare_bulk(rpc);
1219                 if (rc)
1220                         break;
1221
1222                 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1223                 rc = srpc_send_request(rpc);
1224                 break;
1225
1226         case SWI_STATE_REQUEST_SUBMITTED:
1227                 /*
1228                  * CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1229                  * order; however, they're processed in a strict order:
1230                  * rqt, rpy, and bulk.
1231                  */
1232                 if (!rpc->crpc_reqstev.ev_fired)
1233                         break;
1234
1235                 rc = rpc->crpc_reqstev.ev_status;
1236                 if (rc)
1237                         break;
1238
1239                 wi->swi_state = SWI_STATE_REQUEST_SENT;
1240                 /* perhaps more events, fall thru */
1241         case SWI_STATE_REQUEST_SENT: {
1242                 enum srpc_msg_type type = srpc_service2reply(rpc->crpc_service);
1243
1244                 if (!rpc->crpc_replyev.ev_fired)
1245                         break;
1246
1247                 rc = rpc->crpc_replyev.ev_status;
1248                 if (rc)
1249                         break;
1250
1251                 srpc_unpack_msg_hdr(reply);
1252                 if (reply->msg_type != type ||
1253                     (reply->msg_magic != SRPC_MSG_MAGIC &&
1254                      reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1255                         CWARN("Bad message from %s: type %u (%d expected), magic %u (%d expected).\n",
1256                               libcfs_id2str(rpc->crpc_dest),
1257                               reply->msg_type, type,
1258                               reply->msg_magic, SRPC_MSG_MAGIC);
1259                         rc = -EBADMSG;
1260                         break;
1261                 }
1262
1263                 if (do_bulk && reply->msg_body.reply.status) {
1264                         CWARN("Remote error %d at %s, unlink bulk buffer in case peer didn't initiate bulk transfer\n",
1265                               reply->msg_body.reply.status,
1266                               libcfs_id2str(rpc->crpc_dest));
1267                         LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1268                 }
1269
1270                 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1271         }
1272         case SWI_STATE_REPLY_RECEIVED:
1273                 if (do_bulk && !rpc->crpc_bulkev.ev_fired)
1274                         break;
1275
1276                 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1277
1278                 /*
1279                  * Bulk buffer was unlinked due to remote error. Clear error
1280                  * since reply buffer still contains valid data.
1281                  * NB rpc->crpc_done shouldn't look into bulk data in case of
1282                  * remote error.
1283                  */
1284                 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1285                     !rpc->crpc_status && reply->msg_body.reply.status)
1286                         rc = 0;
1287
1288                 wi->swi_state = SWI_STATE_DONE;
1289                 srpc_client_rpc_done(rpc, rc);
1290                 return 1;
1291         }
1292
1293         if (rc) {
1294                 spin_lock(&rpc->crpc_lock);
1295                 srpc_abort_rpc(rpc, rc);
1296                 spin_unlock(&rpc->crpc_lock);
1297         }
1298
1299 abort:
1300         if (rpc->crpc_aborted) {
1301                 LNetMDUnlink(rpc->crpc_reqstmdh);
1302                 LNetMDUnlink(rpc->crpc_replymdh);
1303                 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1304
1305                 if (!srpc_event_pending(rpc)) {
1306                         srpc_client_rpc_done(rpc, -EINTR);
1307                         return 1;
1308                 }
1309         }
1310         return 0;
1311 }
1312
1313 struct srpc_client_rpc *
1314 srpc_create_client_rpc(struct lnet_process_id peer, int service,
1315                        int nbulkiov, int bulklen,
1316                        void (*rpc_done)(struct srpc_client_rpc *),
1317                        void (*rpc_fini)(struct srpc_client_rpc *), void *priv)
1318 {
1319         struct srpc_client_rpc *rpc;
1320
1321         LIBCFS_ALLOC(rpc, offsetof(struct srpc_client_rpc,
1322                                    crpc_bulk.bk_iovs[nbulkiov]));
1323         if (!rpc)
1324                 return NULL;
1325
1326         srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1327                              bulklen, rpc_done, rpc_fini, priv);
1328         return rpc;
1329 }
1330
1331 /* called with rpc->crpc_lock held */
1332 void
1333 srpc_abort_rpc(struct srpc_client_rpc *rpc, int why)
1334 {
1335         LASSERT(why);
1336
1337         if (rpc->crpc_aborted ||        /* already aborted */
1338             rpc->crpc_closed)           /* callback imminent */
1339                 return;
1340
1341         CDEBUG(D_NET, "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1342                rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1343                swi_state2str(rpc->crpc_wi.swi_state), why);
1344
1345         rpc->crpc_aborted = 1;
1346         rpc->crpc_status = why;
1347         swi_schedule_workitem(&rpc->crpc_wi);
1348 }
1349
1350 /* called with rpc->crpc_lock held */
1351 void
1352 srpc_post_rpc(struct srpc_client_rpc *rpc)
1353 {
1354         LASSERT(!rpc->crpc_aborted);
1355         LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
1356
1357         CDEBUG(D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1358                libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1359                rpc->crpc_timeout);
1360
1361         srpc_add_client_rpc_timer(rpc);
1362         swi_schedule_workitem(&rpc->crpc_wi);
1363 }
1364
1365 int
1366 srpc_send_reply(struct srpc_server_rpc *rpc)
1367 {
1368         struct srpc_event *ev = &rpc->srpc_ev;
1369         struct srpc_msg *msg = &rpc->srpc_replymsg;
1370         struct srpc_buffer *buffer = rpc->srpc_reqstbuf;
1371         struct srpc_service_cd *scd = rpc->srpc_scd;
1372         struct srpc_service *sv = scd->scd_svc;
1373         __u64 rpyid;
1374         int rc;
1375
1376         LASSERT(buffer);
1377         rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1378
1379         spin_lock(&scd->scd_lock);
1380
1381         if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1382                 /*
1383                  * Repost buffer before replying since test client
1384                  * might send me another RPC once it gets the reply
1385                  */
1386                 if (srpc_service_post_buffer(scd, buffer))
1387                         CWARN("Failed to repost %s buffer\n", sv->sv_name);
1388                 rpc->srpc_reqstbuf = NULL;
1389         }
1390
1391         spin_unlock(&scd->scd_lock);
1392
1393         ev->ev_fired = 0;
1394         ev->ev_data = rpc;
1395         ev->ev_type = SRPC_REPLY_SENT;
1396
1397         msg->msg_magic = SRPC_MSG_MAGIC;
1398         msg->msg_version = SRPC_MSG_VERSION;
1399         msg->msg_type = srpc_service2reply(sv->sv_id);
1400
1401         rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1402                                    sizeof(*msg), LNET_MD_OP_PUT,
1403                                    rpc->srpc_peer, rpc->srpc_self,
1404                                    &rpc->srpc_replymdh, ev);
1405         if (rc)
1406                 ev->ev_fired = 1; /* no more event expected */
1407         return rc;
1408 }
1409
1410 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1411 static void
1412 srpc_lnet_ev_handler(struct lnet_event *ev)
1413 {
1414         struct srpc_service_cd *scd;
1415         struct srpc_event *rpcev = ev->md.user_ptr;
1416         struct srpc_client_rpc *crpc;
1417         struct srpc_server_rpc *srpc;
1418         struct srpc_buffer *buffer;
1419         struct srpc_service *sv;
1420         struct srpc_msg *msg;
1421         enum srpc_msg_type type;
1422
1423         LASSERT(!in_interrupt());
1424
1425         if (ev->status) {
1426                 __u32 errors;
1427
1428                 spin_lock(&srpc_data.rpc_glock);
1429                 if (ev->status != -ECANCELED) /* cancellation is not error */
1430                         srpc_data.rpc_counters.errors++;
1431                 errors = srpc_data.rpc_counters.errors;
1432                 spin_unlock(&srpc_data.rpc_glock);
1433
1434                 CNETERR("LNet event status %d type %d, RPC errors %u\n",
1435                         ev->status, ev->type, errors);
1436         }
1437
1438         rpcev->ev_lnet = ev->type;
1439
1440         switch (rpcev->ev_type) {
1441         default:
1442                 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1443                        rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1444                 LBUG();
1445         case SRPC_REQUEST_SENT:
1446                 if (!ev->status && ev->type != LNET_EVENT_UNLINK) {
1447                         spin_lock(&srpc_data.rpc_glock);
1448                         srpc_data.rpc_counters.rpcs_sent++;
1449                         spin_unlock(&srpc_data.rpc_glock);
1450                 }
1451         case SRPC_REPLY_RCVD:
1452         case SRPC_BULK_REQ_RCVD:
1453                 crpc = rpcev->ev_data;
1454
1455                 if (rpcev != &crpc->crpc_reqstev &&
1456                     rpcev != &crpc->crpc_replyev &&
1457                     rpcev != &crpc->crpc_bulkev) {
1458                         CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1459                                rpcev, crpc, &crpc->crpc_reqstev,
1460                                &crpc->crpc_replyev, &crpc->crpc_bulkev);
1461                         CERROR("Bad event: status %d, type %d, lnet %d\n",
1462                                rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1463                         LBUG();
1464                 }
1465
1466                 spin_lock(&crpc->crpc_lock);
1467
1468                 LASSERT(!rpcev->ev_fired);
1469                 rpcev->ev_fired = 1;
1470                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1471                                                 -EINTR : ev->status;
1472                 swi_schedule_workitem(&crpc->crpc_wi);
1473
1474                 spin_unlock(&crpc->crpc_lock);
1475                 break;
1476
1477         case SRPC_REQUEST_RCVD:
1478                 scd = rpcev->ev_data;
1479                 sv = scd->scd_svc;
1480
1481                 LASSERT(rpcev == &scd->scd_ev);
1482
1483                 spin_lock(&scd->scd_lock);
1484
1485                 LASSERT(ev->unlinked);
1486                 LASSERT(ev->type == LNET_EVENT_PUT ||
1487                         ev->type == LNET_EVENT_UNLINK);
1488                 LASSERT(ev->type != LNET_EVENT_UNLINK ||
1489                         sv->sv_shuttingdown);
1490
1491                 buffer = container_of(ev->md.start, struct srpc_buffer, buf_msg);
1492                 buffer->buf_peer = ev->initiator;
1493                 buffer->buf_self = ev->target.nid;
1494
1495                 LASSERT(scd->scd_buf_nposted > 0);
1496                 scd->scd_buf_nposted--;
1497
1498                 if (sv->sv_shuttingdown) {
1499                         /*
1500                          * Leave buffer on scd->scd_buf_nposted since
1501                          * srpc_finish_service needs to traverse it.
1502                          */
1503                         spin_unlock(&scd->scd_lock);
1504                         break;
1505                 }
1506
1507                 if (scd->scd_buf_err_stamp &&
1508                     scd->scd_buf_err_stamp < ktime_get_real_seconds()) {
1509                         /* re-enable adding buffer */
1510                         scd->scd_buf_err_stamp = 0;
1511                         scd->scd_buf_err = 0;
1512                 }
1513
1514                 if (!scd->scd_buf_err &&        /* adding buffer is enabled */
1515                     !scd->scd_buf_adjust &&
1516                     scd->scd_buf_nposted < scd->scd_buf_low) {
1517                         scd->scd_buf_adjust = max(scd->scd_buf_total / 2,
1518                                                   SFW_TEST_WI_MIN);
1519                         swi_schedule_workitem(&scd->scd_buf_wi);
1520                 }
1521
1522                 list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1523                 msg = &buffer->buf_msg;
1524                 type = srpc_service2request(sv->sv_id);
1525
1526                 if (ev->status || ev->mlength != sizeof(*msg) ||
1527                     (msg->msg_type != type &&
1528                      msg->msg_type != __swab32(type)) ||
1529                     (msg->msg_magic != SRPC_MSG_MAGIC &&
1530                      msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1531                         CERROR("Dropping RPC (%s) from %s: status %d mlength %d type %u magic %u.\n",
1532                                sv->sv_name, libcfs_id2str(ev->initiator),
1533                                ev->status, ev->mlength,
1534                                msg->msg_type, msg->msg_magic);
1535
1536                         /*
1537                          * NB can't call srpc_service_recycle_buffer here since
1538                          * it may call LNetM[DE]Attach. The invalid magic tells
1539                          * srpc_handle_rpc to drop this RPC
1540                          */
1541                         msg->msg_magic = 0;
1542                 }
1543
1544                 if (!list_empty(&scd->scd_rpc_free)) {
1545                         srpc = list_entry(scd->scd_rpc_free.next,
1546                                           struct srpc_server_rpc,
1547                                           srpc_list);
1548                         list_del(&srpc->srpc_list);
1549
1550                         srpc_init_server_rpc(srpc, scd, buffer);
1551                         list_add_tail(&srpc->srpc_list,
1552                                       &scd->scd_rpc_active);
1553                         swi_schedule_workitem(&srpc->srpc_wi);
1554                 } else {
1555                         list_add_tail(&buffer->buf_list,
1556                                       &scd->scd_buf_blocked);
1557                 }
1558
1559                 spin_unlock(&scd->scd_lock);
1560
1561                 spin_lock(&srpc_data.rpc_glock);
1562                 srpc_data.rpc_counters.rpcs_rcvd++;
1563                 spin_unlock(&srpc_data.rpc_glock);
1564                 break;
1565
1566         case SRPC_BULK_GET_RPLD:
1567                 LASSERT(ev->type == LNET_EVENT_SEND ||
1568                         ev->type == LNET_EVENT_REPLY ||
1569                         ev->type == LNET_EVENT_UNLINK);
1570
1571                 if (!ev->unlinked)
1572                         break; /* wait for final event */
1573
1574         case SRPC_BULK_PUT_SENT:
1575                 if (!ev->status && ev->type != LNET_EVENT_UNLINK) {
1576                         spin_lock(&srpc_data.rpc_glock);
1577
1578                         if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1579                                 srpc_data.rpc_counters.bulk_get += ev->mlength;
1580                         else
1581                                 srpc_data.rpc_counters.bulk_put += ev->mlength;
1582
1583                         spin_unlock(&srpc_data.rpc_glock);
1584                 }
1585         case SRPC_REPLY_SENT:
1586                 srpc = rpcev->ev_data;
1587                 scd = srpc->srpc_scd;
1588
1589                 LASSERT(rpcev == &srpc->srpc_ev);
1590
1591                 spin_lock(&scd->scd_lock);
1592
1593                 rpcev->ev_fired = 1;
1594                 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1595                                    -EINTR : ev->status;
1596                 swi_schedule_workitem(&srpc->srpc_wi);
1597
1598                 spin_unlock(&scd->scd_lock);
1599                 break;
1600         }
1601 }
1602
1603 int
1604 srpc_startup(void)
1605 {
1606         int rc;
1607
1608         memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1609         spin_lock_init(&srpc_data.rpc_glock);
1610
1611         /* 1 second pause to avoid timestamp reuse */
1612         set_current_state(TASK_UNINTERRUPTIBLE);
1613         schedule_timeout(cfs_time_seconds(1));
1614         srpc_data.rpc_matchbits = ((__u64)ktime_get_real_seconds()) << 48;
1615
1616         srpc_data.rpc_state = SRPC_STATE_NONE;
1617
1618         rc = LNetNIInit(LNET_PID_LUSTRE);
1619         if (rc < 0) {
1620                 CERROR("LNetNIInit() has failed: %d\n", rc);
1621                 return rc;
1622         }
1623
1624         srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1625
1626         LNetInvalidateEQHandle(&srpc_data.rpc_lnet_eq);
1627         rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1628         if (rc) {
1629                 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1630                 goto bail;
1631         }
1632
1633         rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1634         LASSERT(!rc);
1635         rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1636         LASSERT(!rc);
1637
1638         srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1639
1640         rc = stt_startup();
1641
1642 bail:
1643         if (rc)
1644                 srpc_shutdown();
1645         else
1646                 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1647
1648         return rc;
1649 }
1650
1651 void
1652 srpc_shutdown(void)
1653 {
1654         int i;
1655         int rc;
1656         int state;
1657
1658         state = srpc_data.rpc_state;
1659         srpc_data.rpc_state = SRPC_STATE_STOPPING;
1660
1661         switch (state) {
1662         default:
1663                 LBUG();
1664         case SRPC_STATE_RUNNING:
1665                 spin_lock(&srpc_data.rpc_glock);
1666
1667                 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1668                         struct srpc_service *sv = srpc_data.rpc_services[i];
1669
1670                         LASSERTF(!sv, "service not empty: id %d, name %s\n",
1671                                  i, sv->sv_name);
1672                 }
1673
1674                 spin_unlock(&srpc_data.rpc_glock);
1675
1676                 stt_shutdown();
1677
1678         case SRPC_STATE_EQ_INIT:
1679                 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1680                 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1681                 LASSERT(!rc);
1682                 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1683                 LASSERT(!rc); /* the EQ should have no user by now */
1684
1685         case SRPC_STATE_NI_INIT:
1686                 LNetNIFini();
1687         }
1688 }