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1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lnet/selftest/rpc.c
37 *
38 * Author: Isaac Huang <isaac@clusterfs.com>
39 *
40 * 2012-05-13: Liang Zhen <liang@whamcloud.com>
41 * - percpt data for service to improve smp performance
42 * - code cleanup
43 */
44
45 #define DEBUG_SUBSYSTEM S_LNET
46
47 #include "selftest.h"
48
49 typedef enum {
50 SRPC_STATE_NONE,
51 SRPC_STATE_NI_INIT,
52 SRPC_STATE_EQ_INIT,
53 SRPC_STATE_RUNNING,
54 SRPC_STATE_STOPPING,
55 } srpc_state_t;
56
57 struct smoketest_rpc {
58 spinlock_t rpc_glock; /* global lock */
59 srpc_service_t *rpc_services[SRPC_SERVICE_MAX_ID + 1];
60 lnet_handle_eq_t rpc_lnet_eq; /* _the_ LNet event queue */
61 srpc_state_t rpc_state;
62 srpc_counters_t rpc_counters;
63 __u64 rpc_matchbits; /* matchbits counter */
64 } srpc_data;
65
66 static inline int
67 srpc_serv_portal(int svc_id)
68 {
69 return svc_id < SRPC_FRAMEWORK_SERVICE_MAX_ID ?
70 SRPC_FRAMEWORK_REQUEST_PORTAL : SRPC_REQUEST_PORTAL;
71 }
72
73 /* forward ref's */
74 int srpc_handle_rpc (swi_workitem_t *wi);
75
76 void srpc_get_counters (srpc_counters_t *cnt)
77 {
78 spin_lock(&srpc_data.rpc_glock);
79 *cnt = srpc_data.rpc_counters;
80 spin_unlock(&srpc_data.rpc_glock);
81 }
82
83 void srpc_set_counters (const srpc_counters_t *cnt)
84 {
85 spin_lock(&srpc_data.rpc_glock);
86 srpc_data.rpc_counters = *cnt;
87 spin_unlock(&srpc_data.rpc_glock);
88 }
89
90 int
91 srpc_add_bulk_page(srpc_bulk_t *bk, struct page *pg, int i, int nob)
92 {
93 nob = min(nob, (int)PAGE_CACHE_SIZE);
94
95 LASSERT(nob > 0);
96 LASSERT(i >= 0 && i < bk->bk_niov);
97
98 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) break;
115
116 __free_page(pg);
117 }
118
119 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
120 return;
121 }
122
123 srpc_bulk_t *
124 srpc_alloc_bulk(int cpt, unsigned bulk_npg, unsigned bulk_len, int sink)
125 {
126 srpc_bulk_t *bk;
127 int i;
128
129 LASSERT(bulk_npg > 0 && bulk_npg <= LNET_MAX_IOV);
130
131 LIBCFS_CPT_ALLOC(bk, lnet_cpt_table(), cpt,
132 offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
133 if (bk == NULL) {
134 CERROR("Can't allocate descriptor for %d pages\n", bulk_npg);
135 return NULL;
136 }
137
138 memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
139 bk->bk_sink = sink;
140 bk->bk_len = bulk_len;
141 bk->bk_niov = bulk_npg;
142
143 for (i = 0; i < bulk_npg; i++) {
144 struct page *pg;
145 int nob;
146
147 pg = alloc_pages_node(cfs_cpt_spread_node(lnet_cpt_table(), cpt),
148 GFP_IOFS, 0);
149 if (pg == NULL) {
150 CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
151 srpc_free_bulk(bk);
152 return NULL;
153 }
154
155 nob = srpc_add_bulk_page(bk, pg, i, bulk_len);
156 bulk_len -= nob;
157 }
158
159 return bk;
160 }
161
162 static inline __u64
163 srpc_next_id (void)
164 {
165 __u64 id;
166
167 spin_lock(&srpc_data.rpc_glock);
168 id = srpc_data.rpc_matchbits++;
169 spin_unlock(&srpc_data.rpc_glock);
170 return id;
171 }
172
173 void
174 srpc_init_server_rpc(struct srpc_server_rpc *rpc,
175 struct srpc_service_cd *scd,
176 struct srpc_buffer *buffer)
177 {
178 memset(rpc, 0, sizeof(*rpc));
179 swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc,
180 srpc_serv_is_framework(scd->scd_svc) ?
181 lst_sched_serial : lst_sched_test[scd->scd_cpt]);
182
183 rpc->srpc_ev.ev_fired = 1; /* no event expected now */
184
185 rpc->srpc_scd = scd;
186 rpc->srpc_reqstbuf = buffer;
187 rpc->srpc_peer = buffer->buf_peer;
188 rpc->srpc_self = buffer->buf_self;
189 LNetInvalidateHandle(&rpc->srpc_replymdh);
190 }
191
192 static void
193 srpc_service_fini(struct srpc_service *svc)
194 {
195 struct srpc_service_cd *scd;
196 struct srpc_server_rpc *rpc;
197 struct srpc_buffer *buf;
198 struct list_head *q;
199 int i;
200
201 if (svc->sv_cpt_data == NULL)
202 return;
203
204 cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
205 while (1) {
206 if (!list_empty(&scd->scd_buf_posted))
207 q = &scd->scd_buf_posted;
208 else if (!list_empty(&scd->scd_buf_blocked))
209 q = &scd->scd_buf_blocked;
210 else
211 break;
212
213 while (!list_empty(q)) {
214 buf = list_entry(q->next,
215 struct srpc_buffer,
216 buf_list);
217 list_del(&buf->buf_list);
218 LIBCFS_FREE(buf, sizeof(*buf));
219 }
220 }
221
222 LASSERT(list_empty(&scd->scd_rpc_active));
223
224 while (!list_empty(&scd->scd_rpc_free)) {
225 rpc = list_entry(scd->scd_rpc_free.next,
226 struct srpc_server_rpc,
227 srpc_list);
228 list_del(&rpc->srpc_list);
229 LIBCFS_FREE(rpc, sizeof(*rpc));
230 }
231 }
232
233 cfs_percpt_free(svc->sv_cpt_data);
234 svc->sv_cpt_data = NULL;
235 }
236
237 static int
238 srpc_service_nrpcs(struct srpc_service *svc)
239 {
240 int nrpcs = svc->sv_wi_total / svc->sv_ncpts;
241
242 return srpc_serv_is_framework(svc) ?
243 max(nrpcs, SFW_FRWK_WI_MIN) : max(nrpcs, SFW_TEST_WI_MIN);
244 }
245
246 int srpc_add_buffer(struct swi_workitem *wi);
247
248 static int
249 srpc_service_init(struct srpc_service *svc)
250 {
251 struct srpc_service_cd *scd;
252 struct srpc_server_rpc *rpc;
253 int nrpcs;
254 int i;
255 int j;
256
257 svc->sv_shuttingdown = 0;
258
259 svc->sv_cpt_data = cfs_percpt_alloc(lnet_cpt_table(),
260 sizeof(struct srpc_service_cd));
261 if (svc->sv_cpt_data == NULL)
262 return -ENOMEM;
263
264 svc->sv_ncpts = srpc_serv_is_framework(svc) ?
265 1 : cfs_cpt_number(lnet_cpt_table());
266 nrpcs = srpc_service_nrpcs(svc);
267
268 cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
269 scd->scd_cpt = i;
270 scd->scd_svc = svc;
271 spin_lock_init(&scd->scd_lock);
272 INIT_LIST_HEAD(&scd->scd_rpc_free);
273 INIT_LIST_HEAD(&scd->scd_rpc_active);
274 INIT_LIST_HEAD(&scd->scd_buf_posted);
275 INIT_LIST_HEAD(&scd->scd_buf_blocked);
276
277 scd->scd_ev.ev_data = scd;
278 scd->scd_ev.ev_type = SRPC_REQUEST_RCVD;
279
280 /* NB: don't use lst_sched_serial for adding buffer,
281 * see details in srpc_service_add_buffers() */
282 swi_init_workitem(&scd->scd_buf_wi, scd,
283 srpc_add_buffer, lst_sched_test[i]);
284
285 if (i != 0 && srpc_serv_is_framework(svc)) {
286 /* NB: framework service only needs srpc_service_cd for
287 * one partition, but we allocate for all to make
288 * it easier to implement, it will waste a little
289 * memory but nobody should care about this */
290 continue;
291 }
292
293 for (j = 0; j < nrpcs; j++) {
294 LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
295 i, sizeof(*rpc));
296 if (rpc == NULL) {
297 srpc_service_fini(svc);
298 return -ENOMEM;
299 }
300 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
301 }
302 }
303
304 return 0;
305 }
306
307 int
308 srpc_add_service(struct srpc_service *sv)
309 {
310 int id = sv->sv_id;
311
312 LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
313
314 if (srpc_service_init(sv) != 0)
315 return -ENOMEM;
316
317 spin_lock(&srpc_data.rpc_glock);
318
319 LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
320
321 if (srpc_data.rpc_services[id] != NULL) {
322 spin_unlock(&srpc_data.rpc_glock);
323 goto failed;
324 }
325
326 srpc_data.rpc_services[id] = sv;
327 spin_unlock(&srpc_data.rpc_glock);
328
329 CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
330 return 0;
331
332 failed:
333 srpc_service_fini(sv);
334 return -EBUSY;
335 }
336
337 int
338 srpc_remove_service (srpc_service_t *sv)
339 {
340 int id = sv->sv_id;
341
342 spin_lock(&srpc_data.rpc_glock);
343
344 if (srpc_data.rpc_services[id] != sv) {
345 spin_unlock(&srpc_data.rpc_glock);
346 return -ENOENT;
347 }
348
349 srpc_data.rpc_services[id] = NULL;
350 spin_unlock(&srpc_data.rpc_glock);
351 return 0;
352 }
353
354 int
355 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
356 int len, int options, lnet_process_id_t peer,
357 lnet_handle_md_t *mdh, srpc_event_t *ev)
358 {
359 int rc;
360 lnet_md_t md;
361 lnet_handle_me_t meh;
362
363 rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
364 local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
365 if (rc != 0) {
366 CERROR ("LNetMEAttach failed: %d\n", rc);
367 LASSERT (rc == -ENOMEM);
368 return -ENOMEM;
369 }
370
371 md.threshold = 1;
372 md.user_ptr = ev;
373 md.start = buf;
374 md.length = len;
375 md.options = options;
376 md.eq_handle = srpc_data.rpc_lnet_eq;
377
378 rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
379 if (rc != 0) {
380 CERROR ("LNetMDAttach failed: %d\n", rc);
381 LASSERT (rc == -ENOMEM);
382
383 rc = LNetMEUnlink(meh);
384 LASSERT (rc == 0);
385 return -ENOMEM;
386 }
387
388 CDEBUG (D_NET,
389 "Posted passive RDMA: peer %s, portal %d, matchbits %#llx\n",
390 libcfs_id2str(peer), portal, matchbits);
391 return 0;
392 }
393
394 int
395 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
396 int options, lnet_process_id_t peer, lnet_nid_t self,
397 lnet_handle_md_t *mdh, srpc_event_t *ev)
398 {
399 int rc;
400 lnet_md_t md;
401
402 md.user_ptr = ev;
403 md.start = buf;
404 md.length = len;
405 md.eq_handle = srpc_data.rpc_lnet_eq;
406 md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
407 md.options = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
408
409 rc = LNetMDBind(md, LNET_UNLINK, mdh);
410 if (rc != 0) {
411 CERROR ("LNetMDBind failed: %d\n", rc);
412 LASSERT (rc == -ENOMEM);
413 return -ENOMEM;
414 }
415
416 /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
417 * they're only meaningful for MDs attached to an ME (i.e. passive
418 * buffers... */
419 if ((options & LNET_MD_OP_PUT) != 0) {
420 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
421 portal, matchbits, 0, 0);
422 } else {
423 LASSERT ((options & LNET_MD_OP_GET) != 0);
424
425 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
426 }
427
428 if (rc != 0) {
429 CERROR ("LNet%s(%s, %d, %lld) failed: %d\n",
430 ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
431 libcfs_id2str(peer), portal, matchbits, rc);
432
433 /* The forthcoming unlink event will complete this operation
434 * with failure, so fall through and return success here.
435 */
436 rc = LNetMDUnlink(*mdh);
437 LASSERT (rc == 0);
438 } else {
439 CDEBUG (D_NET,
440 "Posted active RDMA: peer %s, portal %u, matchbits %#llx\n",
441 libcfs_id2str(peer), portal, matchbits);
442 }
443 return 0;
444 }
445
446 int
447 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
448 int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
449 {
450 return srpc_post_active_rdma(srpc_serv_portal(service), service,
451 buf, len, LNET_MD_OP_PUT, peer,
452 LNET_NID_ANY, mdh, ev);
453 }
454
455 int
456 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
457 lnet_handle_md_t *mdh, srpc_event_t *ev)
458 {
459 lnet_process_id_t any = {0};
460
461 any.nid = LNET_NID_ANY;
462 any.pid = LNET_PID_ANY;
463
464 return srpc_post_passive_rdma(srpc_serv_portal(service),
465 local, service, buf, len,
466 LNET_MD_OP_PUT, any, mdh, ev);
467 }
468
469 int
470 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
471 {
472 struct srpc_service *sv = scd->scd_svc;
473 struct srpc_msg *msg = &buf->buf_msg;
474 int rc;
475
476 LNetInvalidateHandle(&buf->buf_mdh);
477 list_add(&buf->buf_list, &scd->scd_buf_posted);
478 scd->scd_buf_nposted++;
479 spin_unlock(&scd->scd_lock);
480
481 rc = srpc_post_passive_rqtbuf(sv->sv_id,
482 !srpc_serv_is_framework(sv),
483 msg, sizeof(*msg), &buf->buf_mdh,
484 &scd->scd_ev);
485
486 /* At this point, a RPC (new or delayed) may have arrived in
487 * msg and its event handler has been called. So we must add
488 * buf to scd_buf_posted _before_ dropping scd_lock */
489
490 spin_lock(&scd->scd_lock);
491
492 if (rc == 0) {
493 if (!sv->sv_shuttingdown)
494 return 0;
495
496 spin_unlock(&scd->scd_lock);
497 /* srpc_shutdown_service might have tried to unlink me
498 * when my buf_mdh was still invalid */
499 LNetMDUnlink(buf->buf_mdh);
500 spin_lock(&scd->scd_lock);
501 return 0;
502 }
503
504 scd->scd_buf_nposted--;
505 if (sv->sv_shuttingdown)
506 return rc; /* don't allow to change scd_buf_posted */
507
508 list_del(&buf->buf_list);
509 spin_unlock(&scd->scd_lock);
510
511 LIBCFS_FREE(buf, sizeof(*buf));
512
513 spin_lock(&scd->scd_lock);
514 return rc;
515 }
516
517 int
518 srpc_add_buffer(struct swi_workitem *wi)
519 {
520 struct srpc_service_cd *scd = wi->swi_workitem.wi_data;
521 struct srpc_buffer *buf;
522 int rc = 0;
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 spin_lock(&scd->scd_lock);
528
529 while (scd->scd_buf_adjust > 0 &&
530 !scd->scd_svc->sv_shuttingdown) {
531 scd->scd_buf_adjust--; /* consume it */
532 scd->scd_buf_posting++;
533
534 spin_unlock(&scd->scd_lock);
535
536 LIBCFS_ALLOC(buf, sizeof(*buf));
537 if (buf == NULL) {
538 CERROR("Failed to add new buf to service: %s\n",
539 scd->scd_svc->sv_name);
540 spin_lock(&scd->scd_lock);
541 rc = -ENOMEM;
542 break;
543 }
544
545 spin_lock(&scd->scd_lock);
546 if (scd->scd_svc->sv_shuttingdown) {
547 spin_unlock(&scd->scd_lock);
548 LIBCFS_FREE(buf, sizeof(*buf));
549
550 spin_lock(&scd->scd_lock);
551 rc = -ESHUTDOWN;
552 break;
553 }
554
555 rc = srpc_service_post_buffer(scd, buf);
556 if (rc != 0)
557 break; /* buf has been freed inside */
558
559 LASSERT(scd->scd_buf_posting > 0);
560 scd->scd_buf_posting--;
561 scd->scd_buf_total++;
562 scd->scd_buf_low = MAX(2, scd->scd_buf_total / 4);
563 }
564
565 if (rc != 0) {
566 scd->scd_buf_err_stamp = get_seconds();
567 scd->scd_buf_err = rc;
568
569 LASSERT(scd->scd_buf_posting > 0);
570 scd->scd_buf_posting--;
571 }
572
573 spin_unlock(&scd->scd_lock);
574 return 0;
575 }
576
577 int
578 srpc_service_add_buffers(struct srpc_service *sv, int nbuffer)
579 {
580 struct srpc_service_cd *scd;
581 int rc = 0;
582 int i;
583
584 LASSERTF(nbuffer > 0, "nbuffer must be positive: %d\n", nbuffer);
585
586 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
587 spin_lock(&scd->scd_lock);
588
589 scd->scd_buf_err = 0;
590 scd->scd_buf_err_stamp = 0;
591 scd->scd_buf_posting = 0;
592 scd->scd_buf_adjust = nbuffer;
593 /* start to post buffers */
594 swi_schedule_workitem(&scd->scd_buf_wi);
595 spin_unlock(&scd->scd_lock);
596
597 /* framework service only post buffer for one partition */
598 if (srpc_serv_is_framework(sv))
599 break;
600 }
601
602 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
603 spin_lock(&scd->scd_lock);
604 /*
605 * NB: srpc_service_add_buffers() can be called inside
606 * thread context of lst_sched_serial, and we don't normally
607 * allow to sleep inside thread context of WI scheduler
608 * because it will block current scheduler thread from doing
609 * anything else, even worse, it could deadlock if it's
610 * waiting on result from another WI of the same scheduler.
611 * However, it's safe at here because scd_buf_wi is scheduled
612 * by thread in a different WI scheduler (lst_sched_test),
613 * so we don't have any risk of deadlock, though this could
614 * block all WIs pending on lst_sched_serial for a moment
615 * which is not good but not fatal.
616 */
617 lst_wait_until(scd->scd_buf_err != 0 ||
618 (scd->scd_buf_adjust == 0 &&
619 scd->scd_buf_posting == 0),
620 scd->scd_lock, "waiting for adding buffer\n");
621
622 if (scd->scd_buf_err != 0 && rc == 0)
623 rc = scd->scd_buf_err;
624
625 spin_unlock(&scd->scd_lock);
626 }
627
628 return rc;
629 }
630
631 void
632 srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer)
633 {
634 struct srpc_service_cd *scd;
635 int num;
636 int i;
637
638 LASSERT(!sv->sv_shuttingdown);
639
640 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
641 spin_lock(&scd->scd_lock);
642
643 num = scd->scd_buf_total + scd->scd_buf_posting;
644 scd->scd_buf_adjust -= min(nbuffer, num);
645
646 spin_unlock(&scd->scd_lock);
647 }
648 }
649
650 /* returns 1 if sv has finished, otherwise 0 */
651 int
652 srpc_finish_service(struct srpc_service *sv)
653 {
654 struct srpc_service_cd *scd;
655 struct srpc_server_rpc *rpc;
656 int i;
657
658 LASSERT(sv->sv_shuttingdown); /* srpc_shutdown_service called */
659
660 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
661 spin_lock(&scd->scd_lock);
662 if (!swi_deschedule_workitem(&scd->scd_buf_wi)) {
663 spin_unlock(&scd->scd_lock);
664 return 0;
665 }
666
667 if (scd->scd_buf_nposted > 0) {
668 CDEBUG(D_NET, "waiting for %d posted buffers to unlink",
669 scd->scd_buf_nposted);
670 spin_unlock(&scd->scd_lock);
671 return 0;
672 }
673
674 if (list_empty(&scd->scd_rpc_active)) {
675 spin_unlock(&scd->scd_lock);
676 continue;
677 }
678
679 rpc = list_entry(scd->scd_rpc_active.next,
680 struct srpc_server_rpc, srpc_list);
681 CNETERR("Active RPC %p on shutdown: sv %s, peer %s, "
682 "wi %s scheduled %d running %d, "
683 "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 void
701 srpc_service_recycle_buffer(struct srpc_service_cd *scd, srpc_buffer_t *buf)
702 {
703 if (!scd->scd_svc->sv_shuttingdown && scd->scd_buf_adjust >= 0) {
704 if (srpc_service_post_buffer(scd, buf) != 0) {
705 CWARN("Failed to post %s buffer\n",
706 scd->scd_svc->sv_name);
707 }
708 return;
709 }
710
711 /* service is shutting down, or we want to recycle some buffers */
712 scd->scd_buf_total--;
713
714 if (scd->scd_buf_adjust < 0) {
715 scd->scd_buf_adjust++;
716 if (scd->scd_buf_adjust < 0 &&
717 scd->scd_buf_total == 0 && scd->scd_buf_posting == 0) {
718 CDEBUG(D_INFO,
719 "Try to recycle %d buffers but nothing left\n",
720 scd->scd_buf_adjust);
721 scd->scd_buf_adjust = 0;
722 }
723 }
724
725 spin_unlock(&scd->scd_lock);
726 LIBCFS_FREE(buf, sizeof(*buf));
727 spin_lock(&scd->scd_lock);
728 }
729
730 void
731 srpc_abort_service(struct srpc_service *sv)
732 {
733 struct srpc_service_cd *scd;
734 struct srpc_server_rpc *rpc;
735 int i;
736
737 CDEBUG(D_NET, "Aborting service: id %d, name %s\n",
738 sv->sv_id, sv->sv_name);
739
740 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
741 spin_lock(&scd->scd_lock);
742
743 /* schedule in-flight RPCs to notice the abort, NB:
744 * racing with incoming RPCs; complete fix should make test
745 * RPCs carry session ID in its headers */
746 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list) {
747 rpc->srpc_aborted = 1;
748 swi_schedule_workitem(&rpc->srpc_wi);
749 }
750
751 spin_unlock(&scd->scd_lock);
752 }
753 }
754
755 void
756 srpc_shutdown_service(srpc_service_t *sv)
757 {
758 struct srpc_service_cd *scd;
759 struct srpc_server_rpc *rpc;
760 srpc_buffer_t *buf;
761 int i;
762
763 CDEBUG(D_NET, "Shutting down service: id %d, name %s\n",
764 sv->sv_id, sv->sv_name);
765
766 cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
767 spin_lock(&scd->scd_lock);
768
769 sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
770
771 cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
772 spin_unlock(&scd->scd_lock);
773
774 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
775 spin_lock(&scd->scd_lock);
776
777 /* schedule in-flight RPCs to notice the shutdown */
778 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list)
779 swi_schedule_workitem(&rpc->srpc_wi);
780
781 spin_unlock(&scd->scd_lock);
782
783 /* OK to traverse scd_buf_posted without lock, since no one
784 * touches scd_buf_posted now */
785 list_for_each_entry(buf, &scd->scd_buf_posted, buf_list)
786 LNetMDUnlink(buf->buf_mdh);
787 }
788 }
789
790 int
791 srpc_send_request (srpc_client_rpc_t *rpc)
792 {
793 srpc_event_t *ev = &rpc->crpc_reqstev;
794 int rc;
795
796 ev->ev_fired = 0;
797 ev->ev_data = rpc;
798 ev->ev_type = SRPC_REQUEST_SENT;
799
800 rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
801 &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
802 &rpc->crpc_reqstmdh, ev);
803 if (rc != 0) {
804 LASSERT (rc == -ENOMEM);
805 ev->ev_fired = 1; /* no more event expected */
806 }
807 return rc;
808 }
809
810 int
811 srpc_prepare_reply (srpc_client_rpc_t *rpc)
812 {
813 srpc_event_t *ev = &rpc->crpc_replyev;
814 __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
815 int rc;
816
817 ev->ev_fired = 0;
818 ev->ev_data = rpc;
819 ev->ev_type = SRPC_REPLY_RCVD;
820
821 *id = srpc_next_id();
822
823 rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
824 &rpc->crpc_replymsg, sizeof(srpc_msg_t),
825 LNET_MD_OP_PUT, rpc->crpc_dest,
826 &rpc->crpc_replymdh, ev);
827 if (rc != 0) {
828 LASSERT (rc == -ENOMEM);
829 ev->ev_fired = 1; /* no more event expected */
830 }
831 return rc;
832 }
833
834 int
835 srpc_prepare_bulk (srpc_client_rpc_t *rpc)
836 {
837 srpc_bulk_t *bk = &rpc->crpc_bulk;
838 srpc_event_t *ev = &rpc->crpc_bulkev;
839 __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
840 int rc;
841 int opt;
842
843 LASSERT (bk->bk_niov <= LNET_MAX_IOV);
844
845 if (bk->bk_niov == 0) return 0; /* nothing to do */
846
847 opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
848 opt |= LNET_MD_KIOV;
849
850 ev->ev_fired = 0;
851 ev->ev_data = rpc;
852 ev->ev_type = SRPC_BULK_REQ_RCVD;
853
854 *id = srpc_next_id();
855
856 rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
857 &bk->bk_iovs[0], bk->bk_niov, opt,
858 rpc->crpc_dest, &bk->bk_mdh, ev);
859 if (rc != 0) {
860 LASSERT (rc == -ENOMEM);
861 ev->ev_fired = 1; /* no more event expected */
862 }
863 return rc;
864 }
865
866 int
867 srpc_do_bulk (srpc_server_rpc_t *rpc)
868 {
869 srpc_event_t *ev = &rpc->srpc_ev;
870 srpc_bulk_t *bk = rpc->srpc_bulk;
871 __u64 id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
872 int rc;
873 int opt;
874
875 LASSERT (bk != NULL);
876
877 opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
878 opt |= LNET_MD_KIOV;
879
880 ev->ev_fired = 0;
881 ev->ev_data = rpc;
882 ev->ev_type = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
883
884 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
885 &bk->bk_iovs[0], bk->bk_niov, opt,
886 rpc->srpc_peer, rpc->srpc_self,
887 &bk->bk_mdh, ev);
888 if (rc != 0)
889 ev->ev_fired = 1; /* no more event expected */
890 return rc;
891 }
892
893 /* only called from srpc_handle_rpc */
894 void
895 srpc_server_rpc_done(srpc_server_rpc_t *rpc, int status)
896 {
897 struct srpc_service_cd *scd = rpc->srpc_scd;
898 struct srpc_service *sv = scd->scd_svc;
899 srpc_buffer_t *buffer;
900
901 LASSERT (status != 0 || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
902
903 rpc->srpc_status = status;
904
905 CDEBUG_LIMIT (status == 0 ? D_NET : D_NETERROR,
906 "Server RPC %p done: service %s, peer %s, status %s:%d\n",
907 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
908 swi_state2str(rpc->srpc_wi.swi_state), status);
909
910 if (status != 0) {
911 spin_lock(&srpc_data.rpc_glock);
912 srpc_data.rpc_counters.rpcs_dropped++;
913 spin_unlock(&srpc_data.rpc_glock);
914 }
915
916 if (rpc->srpc_done != NULL)
917 (*rpc->srpc_done) (rpc);
918 LASSERT(rpc->srpc_bulk == NULL);
919
920 spin_lock(&scd->scd_lock);
921
922 if (rpc->srpc_reqstbuf != NULL) {
923 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
924 * sv won't go away for scd_rpc_active must not be empty */
925 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
926 rpc->srpc_reqstbuf = NULL;
927 }
928
929 list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
930
931 /*
932 * No one can schedule me now since:
933 * - I'm not on scd_rpc_active.
934 * - all LNet events have been fired.
935 * Cancel pending schedules and prevent future schedule attempts:
936 */
937 LASSERT(rpc->srpc_ev.ev_fired);
938 swi_exit_workitem(&rpc->srpc_wi);
939
940 if (!sv->sv_shuttingdown && !list_empty(&scd->scd_buf_blocked)) {
941 buffer = list_entry(scd->scd_buf_blocked.next,
942 srpc_buffer_t, buf_list);
943 list_del(&buffer->buf_list);
944
945 srpc_init_server_rpc(rpc, scd, buffer);
946 list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
947 swi_schedule_workitem(&rpc->srpc_wi);
948 } else {
949 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
950 }
951
952 spin_unlock(&scd->scd_lock);
953 return;
954 }
955
956 /* handles an incoming RPC */
957 int
958 srpc_handle_rpc(swi_workitem_t *wi)
959 {
960 struct srpc_server_rpc *rpc = wi->swi_workitem.wi_data;
961 struct srpc_service_cd *scd = rpc->srpc_scd;
962 struct srpc_service *sv = scd->scd_svc;
963 srpc_event_t *ev = &rpc->srpc_ev;
964 int rc = 0;
965
966 LASSERT(wi == &rpc->srpc_wi);
967
968 spin_lock(&scd->scd_lock);
969
970 if (sv->sv_shuttingdown || rpc->srpc_aborted) {
971 spin_unlock(&scd->scd_lock);
972
973 if (rpc->srpc_bulk != NULL)
974 LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
975 LNetMDUnlink(rpc->srpc_replymdh);
976
977 if (ev->ev_fired) { /* no more event, OK to finish */
978 srpc_server_rpc_done(rpc, -ESHUTDOWN);
979 return 1;
980 }
981 return 0;
982 }
983
984 spin_unlock(&scd->scd_lock);
985
986 switch (wi->swi_state) {
987 default:
988 LBUG ();
989 case SWI_STATE_NEWBORN: {
990 srpc_msg_t *msg;
991 srpc_generic_reply_t *reply;
992
993 msg = &rpc->srpc_reqstbuf->buf_msg;
994 reply = &rpc->srpc_replymsg.msg_body.reply;
995
996 if (msg->msg_magic == 0) {
997 /* moaned already in srpc_lnet_ev_handler */
998 srpc_server_rpc_done(rpc, EBADMSG);
999 return 1;
1000 }
1001
1002 srpc_unpack_msg_hdr(msg);
1003 if (msg->msg_version != SRPC_MSG_VERSION) {
1004 CWARN("Version mismatch: %u, %u expected, from %s\n",
1005 msg->msg_version, SRPC_MSG_VERSION,
1006 libcfs_id2str(rpc->srpc_peer));
1007 reply->status = EPROTO;
1008 /* drop through and send reply */
1009 } else {
1010 reply->status = 0;
1011 rc = (*sv->sv_handler)(rpc);
1012 LASSERT(reply->status == 0 || !rpc->srpc_bulk);
1013 if (rc != 0) {
1014 srpc_server_rpc_done(rpc, rc);
1015 return 1;
1016 }
1017 }
1018
1019 wi->swi_state = SWI_STATE_BULK_STARTED;
1020
1021 if (rpc->srpc_bulk != NULL) {
1022 rc = srpc_do_bulk(rpc);
1023 if (rc == 0)
1024 return 0; /* wait for bulk */
1025
1026 LASSERT (ev->ev_fired);
1027 ev->ev_status = rc;
1028 }
1029 }
1030 case SWI_STATE_BULK_STARTED:
1031 LASSERT (rpc->srpc_bulk == NULL || ev->ev_fired);
1032
1033 if (rpc->srpc_bulk != NULL) {
1034 rc = ev->ev_status;
1035
1036 if (sv->sv_bulk_ready != NULL)
1037 rc = (*sv->sv_bulk_ready) (rpc, rc);
1038
1039 if (rc != 0) {
1040 srpc_server_rpc_done(rpc, rc);
1041 return 1;
1042 }
1043 }
1044
1045 wi->swi_state = SWI_STATE_REPLY_SUBMITTED;
1046 rc = srpc_send_reply(rpc);
1047 if (rc == 0)
1048 return 0; /* wait for reply */
1049 srpc_server_rpc_done(rpc, rc);
1050 return 1;
1051
1052 case SWI_STATE_REPLY_SUBMITTED:
1053 if (!ev->ev_fired) {
1054 CERROR("RPC %p: bulk %p, service %d\n",
1055 rpc, rpc->srpc_bulk, sv->sv_id);
1056 CERROR("Event: status %d, type %d, lnet %d\n",
1057 ev->ev_status, ev->ev_type, ev->ev_lnet);
1058 LASSERT (ev->ev_fired);
1059 }
1060
1061 wi->swi_state = SWI_STATE_DONE;
1062 srpc_server_rpc_done(rpc, ev->ev_status);
1063 return 1;
1064 }
1065
1066 return 0;
1067 }
1068
1069 void
1070 srpc_client_rpc_expired (void *data)
1071 {
1072 srpc_client_rpc_t *rpc = data;
1073
1074 CWARN ("Client RPC expired: service %d, peer %s, timeout %d.\n",
1075 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1076 rpc->crpc_timeout);
1077
1078 spin_lock(&rpc->crpc_lock);
1079
1080 rpc->crpc_timeout = 0;
1081 srpc_abort_rpc(rpc, -ETIMEDOUT);
1082
1083 spin_unlock(&rpc->crpc_lock);
1084
1085 spin_lock(&srpc_data.rpc_glock);
1086 srpc_data.rpc_counters.rpcs_expired++;
1087 spin_unlock(&srpc_data.rpc_glock);
1088 }
1089
1090 inline void
1091 srpc_add_client_rpc_timer (srpc_client_rpc_t *rpc)
1092 {
1093 stt_timer_t *timer = &rpc->crpc_timer;
1094
1095 if (rpc->crpc_timeout == 0) return;
1096
1097 INIT_LIST_HEAD(&timer->stt_list);
1098 timer->stt_data = rpc;
1099 timer->stt_func = srpc_client_rpc_expired;
1100 timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1101 get_seconds());
1102 stt_add_timer(timer);
1103 return;
1104 }
1105
1106 /*
1107 * Called with rpc->crpc_lock held.
1108 *
1109 * Upon exit the RPC expiry timer is not queued and the handler is not
1110 * running on any CPU. */
1111 void
1112 srpc_del_client_rpc_timer (srpc_client_rpc_t *rpc)
1113 {
1114 /* timer not planted or already exploded */
1115 if (rpc->crpc_timeout == 0)
1116 return;
1117
1118 /* timer successfully defused */
1119 if (stt_del_timer(&rpc->crpc_timer))
1120 return;
1121
1122 /* timer detonated, wait for it to explode */
1123 while (rpc->crpc_timeout != 0) {
1124 spin_unlock(&rpc->crpc_lock);
1125
1126 schedule();
1127
1128 spin_lock(&rpc->crpc_lock);
1129 }
1130 }
1131
1132 void
1133 srpc_client_rpc_done (srpc_client_rpc_t *rpc, int status)
1134 {
1135 swi_workitem_t *wi = &rpc->crpc_wi;
1136
1137 LASSERT(status != 0 || wi->swi_state == SWI_STATE_DONE);
1138
1139 spin_lock(&rpc->crpc_lock);
1140
1141 rpc->crpc_closed = 1;
1142 if (rpc->crpc_status == 0)
1143 rpc->crpc_status = status;
1144
1145 srpc_del_client_rpc_timer(rpc);
1146
1147 CDEBUG_LIMIT ((status == 0) ? D_NET : D_NETERROR,
1148 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1149 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1150 swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1151
1152 /*
1153 * No one can schedule me now since:
1154 * - RPC timer has been defused.
1155 * - all LNet events have been fired.
1156 * - crpc_closed has been set, preventing srpc_abort_rpc from
1157 * scheduling me.
1158 * Cancel pending schedules and prevent future schedule attempts:
1159 */
1160 LASSERT (!srpc_event_pending(rpc));
1161 swi_exit_workitem(wi);
1162
1163 spin_unlock(&rpc->crpc_lock);
1164
1165 (*rpc->crpc_done)(rpc);
1166 return;
1167 }
1168
1169 /* sends an outgoing RPC */
1170 int
1171 srpc_send_rpc (swi_workitem_t *wi)
1172 {
1173 int rc = 0;
1174 srpc_client_rpc_t *rpc;
1175 srpc_msg_t *reply;
1176 int do_bulk;
1177
1178 LASSERT(wi != NULL);
1179
1180 rpc = wi->swi_workitem.wi_data;
1181
1182 LASSERT (rpc != NULL);
1183 LASSERT (wi == &rpc->crpc_wi);
1184
1185 reply = &rpc->crpc_replymsg;
1186 do_bulk = rpc->crpc_bulk.bk_niov > 0;
1187
1188 spin_lock(&rpc->crpc_lock);
1189
1190 if (rpc->crpc_aborted) {
1191 spin_unlock(&rpc->crpc_lock);
1192 goto abort;
1193 }
1194
1195 spin_unlock(&rpc->crpc_lock);
1196
1197 switch (wi->swi_state) {
1198 default:
1199 LBUG ();
1200 case SWI_STATE_NEWBORN:
1201 LASSERT (!srpc_event_pending(rpc));
1202
1203 rc = srpc_prepare_reply(rpc);
1204 if (rc != 0) {
1205 srpc_client_rpc_done(rpc, rc);
1206 return 1;
1207 }
1208
1209 rc = srpc_prepare_bulk(rpc);
1210 if (rc != 0) break;
1211
1212 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1213 rc = srpc_send_request(rpc);
1214 break;
1215
1216 case SWI_STATE_REQUEST_SUBMITTED:
1217 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1218 * order; however, they're processed in a strict order:
1219 * rqt, rpy, and bulk. */
1220 if (!rpc->crpc_reqstev.ev_fired) break;
1221
1222 rc = rpc->crpc_reqstev.ev_status;
1223 if (rc != 0) break;
1224
1225 wi->swi_state = SWI_STATE_REQUEST_SENT;
1226 /* perhaps more events, fall thru */
1227 case SWI_STATE_REQUEST_SENT: {
1228 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1229
1230 if (!rpc->crpc_replyev.ev_fired) break;
1231
1232 rc = rpc->crpc_replyev.ev_status;
1233 if (rc != 0) break;
1234
1235 srpc_unpack_msg_hdr(reply);
1236 if (reply->msg_type != type ||
1237 (reply->msg_magic != SRPC_MSG_MAGIC &&
1238 reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1239 CWARN ("Bad message from %s: type %u (%d expected),"
1240 " magic %u (%d expected).\n",
1241 libcfs_id2str(rpc->crpc_dest),
1242 reply->msg_type, type,
1243 reply->msg_magic, SRPC_MSG_MAGIC);
1244 rc = -EBADMSG;
1245 break;
1246 }
1247
1248 if (do_bulk && reply->msg_body.reply.status != 0) {
1249 CWARN ("Remote error %d at %s, unlink bulk buffer in "
1250 "case peer didn't initiate bulk transfer\n",
1251 reply->msg_body.reply.status,
1252 libcfs_id2str(rpc->crpc_dest));
1253 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1254 }
1255
1256 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1257 }
1258 case SWI_STATE_REPLY_RECEIVED:
1259 if (do_bulk && !rpc->crpc_bulkev.ev_fired) break;
1260
1261 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1262
1263 /* Bulk buffer was unlinked due to remote error. Clear error
1264 * since reply buffer still contains valid data.
1265 * NB rpc->crpc_done shouldn't look into bulk data in case of
1266 * remote error. */
1267 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1268 rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1269 rc = 0;
1270
1271 wi->swi_state = SWI_STATE_DONE;
1272 srpc_client_rpc_done(rpc, rc);
1273 return 1;
1274 }
1275
1276 if (rc != 0) {
1277 spin_lock(&rpc->crpc_lock);
1278 srpc_abort_rpc(rpc, rc);
1279 spin_unlock(&rpc->crpc_lock);
1280 }
1281
1282 abort:
1283 if (rpc->crpc_aborted) {
1284 LNetMDUnlink(rpc->crpc_reqstmdh);
1285 LNetMDUnlink(rpc->crpc_replymdh);
1286 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1287
1288 if (!srpc_event_pending(rpc)) {
1289 srpc_client_rpc_done(rpc, -EINTR);
1290 return 1;
1291 }
1292 }
1293 return 0;
1294 }
1295
1296 srpc_client_rpc_t *
1297 srpc_create_client_rpc (lnet_process_id_t peer, int service,
1298 int nbulkiov, int bulklen,
1299 void (*rpc_done)(srpc_client_rpc_t *),
1300 void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1301 {
1302 srpc_client_rpc_t *rpc;
1303
1304 LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1305 crpc_bulk.bk_iovs[nbulkiov]));
1306 if (rpc == NULL)
1307 return NULL;
1308
1309 srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1310 bulklen, rpc_done, rpc_fini, priv);
1311 return rpc;
1312 }
1313
1314 /* called with rpc->crpc_lock held */
1315 void
1316 srpc_abort_rpc (srpc_client_rpc_t *rpc, int why)
1317 {
1318 LASSERT (why != 0);
1319
1320 if (rpc->crpc_aborted || /* already aborted */
1321 rpc->crpc_closed) /* callback imminent */
1322 return;
1323
1324 CDEBUG (D_NET,
1325 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1326 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1327 swi_state2str(rpc->crpc_wi.swi_state), why);
1328
1329 rpc->crpc_aborted = 1;
1330 rpc->crpc_status = why;
1331 swi_schedule_workitem(&rpc->crpc_wi);
1332 return;
1333 }
1334
1335 /* called with rpc->crpc_lock held */
1336 void
1337 srpc_post_rpc (srpc_client_rpc_t *rpc)
1338 {
1339 LASSERT (!rpc->crpc_aborted);
1340 LASSERT (srpc_data.rpc_state == SRPC_STATE_RUNNING);
1341
1342 CDEBUG (D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1343 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1344 rpc->crpc_timeout);
1345
1346 srpc_add_client_rpc_timer(rpc);
1347 swi_schedule_workitem(&rpc->crpc_wi);
1348 return;
1349 }
1350
1351
1352 int
1353 srpc_send_reply(struct srpc_server_rpc *rpc)
1354 {
1355 srpc_event_t *ev = &rpc->srpc_ev;
1356 struct srpc_msg *msg = &rpc->srpc_replymsg;
1357 struct srpc_buffer *buffer = rpc->srpc_reqstbuf;
1358 struct srpc_service_cd *scd = rpc->srpc_scd;
1359 struct srpc_service *sv = scd->scd_svc;
1360 __u64 rpyid;
1361 int rc;
1362
1363 LASSERT(buffer != NULL);
1364 rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1365
1366 spin_lock(&scd->scd_lock);
1367
1368 if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1369 /* Repost buffer before replying since test client
1370 * might send me another RPC once it gets the reply */
1371 if (srpc_service_post_buffer(scd, buffer) != 0)
1372 CWARN("Failed to repost %s buffer\n", sv->sv_name);
1373 rpc->srpc_reqstbuf = NULL;
1374 }
1375
1376 spin_unlock(&scd->scd_lock);
1377
1378 ev->ev_fired = 0;
1379 ev->ev_data = rpc;
1380 ev->ev_type = SRPC_REPLY_SENT;
1381
1382 msg->msg_magic = SRPC_MSG_MAGIC;
1383 msg->msg_version = SRPC_MSG_VERSION;
1384 msg->msg_type = srpc_service2reply(sv->sv_id);
1385
1386 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1387 sizeof(*msg), LNET_MD_OP_PUT,
1388 rpc->srpc_peer, rpc->srpc_self,
1389 &rpc->srpc_replymdh, ev);
1390 if (rc != 0)
1391 ev->ev_fired = 1; /* no more event expected */
1392 return rc;
1393 }
1394
1395 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1396 void
1397 srpc_lnet_ev_handler(lnet_event_t *ev)
1398 {
1399 struct srpc_service_cd *scd;
1400 srpc_event_t *rpcev = ev->md.user_ptr;
1401 srpc_client_rpc_t *crpc;
1402 srpc_server_rpc_t *srpc;
1403 srpc_buffer_t *buffer;
1404 srpc_service_t *sv;
1405 srpc_msg_t *msg;
1406 srpc_msg_type_t type;
1407
1408 LASSERT (!in_interrupt());
1409
1410 if (ev->status != 0) {
1411 spin_lock(&srpc_data.rpc_glock);
1412 srpc_data.rpc_counters.errors++;
1413 spin_unlock(&srpc_data.rpc_glock);
1414 }
1415
1416 rpcev->ev_lnet = ev->type;
1417
1418 switch (rpcev->ev_type) {
1419 default:
1420 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1421 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1422 LBUG ();
1423 case SRPC_REQUEST_SENT:
1424 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1425 spin_lock(&srpc_data.rpc_glock);
1426 srpc_data.rpc_counters.rpcs_sent++;
1427 spin_unlock(&srpc_data.rpc_glock);
1428 }
1429 case SRPC_REPLY_RCVD:
1430 case SRPC_BULK_REQ_RCVD:
1431 crpc = rpcev->ev_data;
1432
1433 if (rpcev != &crpc->crpc_reqstev &&
1434 rpcev != &crpc->crpc_replyev &&
1435 rpcev != &crpc->crpc_bulkev) {
1436 CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1437 rpcev, crpc, &crpc->crpc_reqstev,
1438 &crpc->crpc_replyev, &crpc->crpc_bulkev);
1439 CERROR("Bad event: status %d, type %d, lnet %d\n",
1440 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1441 LBUG ();
1442 }
1443
1444 spin_lock(&crpc->crpc_lock);
1445
1446 LASSERT(rpcev->ev_fired == 0);
1447 rpcev->ev_fired = 1;
1448 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1449 -EINTR : ev->status;
1450 swi_schedule_workitem(&crpc->crpc_wi);
1451
1452 spin_unlock(&crpc->crpc_lock);
1453 break;
1454
1455 case SRPC_REQUEST_RCVD:
1456 scd = rpcev->ev_data;
1457 sv = scd->scd_svc;
1458
1459 LASSERT(rpcev == &scd->scd_ev);
1460
1461 spin_lock(&scd->scd_lock);
1462
1463 LASSERT (ev->unlinked);
1464 LASSERT (ev->type == LNET_EVENT_PUT ||
1465 ev->type == LNET_EVENT_UNLINK);
1466 LASSERT (ev->type != LNET_EVENT_UNLINK ||
1467 sv->sv_shuttingdown);
1468
1469 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1470 buffer->buf_peer = ev->initiator;
1471 buffer->buf_self = ev->target.nid;
1472
1473 LASSERT(scd->scd_buf_nposted > 0);
1474 scd->scd_buf_nposted--;
1475
1476 if (sv->sv_shuttingdown) {
1477 /* Leave buffer on scd->scd_buf_nposted since
1478 * srpc_finish_service needs to traverse it. */
1479 spin_unlock(&scd->scd_lock);
1480 break;
1481 }
1482
1483 if (scd->scd_buf_err_stamp != 0 &&
1484 scd->scd_buf_err_stamp < get_seconds()) {
1485 /* re-enable adding buffer */
1486 scd->scd_buf_err_stamp = 0;
1487 scd->scd_buf_err = 0;
1488 }
1489
1490 if (scd->scd_buf_err == 0 && /* adding buffer is enabled */
1491 scd->scd_buf_adjust == 0 &&
1492 scd->scd_buf_nposted < scd->scd_buf_low) {
1493 scd->scd_buf_adjust = MAX(scd->scd_buf_total / 2,
1494 SFW_TEST_WI_MIN);
1495 swi_schedule_workitem(&scd->scd_buf_wi);
1496 }
1497
1498 list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1499 msg = &buffer->buf_msg;
1500 type = srpc_service2request(sv->sv_id);
1501
1502 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1503 (msg->msg_type != type &&
1504 msg->msg_type != __swab32(type)) ||
1505 (msg->msg_magic != SRPC_MSG_MAGIC &&
1506 msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1507 CERROR ("Dropping RPC (%s) from %s: "
1508 "status %d mlength %d type %u magic %u.\n",
1509 sv->sv_name, libcfs_id2str(ev->initiator),
1510 ev->status, ev->mlength,
1511 msg->msg_type, msg->msg_magic);
1512
1513 /* NB can't call srpc_service_recycle_buffer here since
1514 * it may call LNetM[DE]Attach. The invalid magic tells
1515 * srpc_handle_rpc to drop this RPC */
1516 msg->msg_magic = 0;
1517 }
1518
1519 if (!list_empty(&scd->scd_rpc_free)) {
1520 srpc = list_entry(scd->scd_rpc_free.next,
1521 struct srpc_server_rpc,
1522 srpc_list);
1523 list_del(&srpc->srpc_list);
1524
1525 srpc_init_server_rpc(srpc, scd, buffer);
1526 list_add_tail(&srpc->srpc_list,
1527 &scd->scd_rpc_active);
1528 swi_schedule_workitem(&srpc->srpc_wi);
1529 } else {
1530 list_add_tail(&buffer->buf_list,
1531 &scd->scd_buf_blocked);
1532 }
1533
1534 spin_unlock(&scd->scd_lock);
1535
1536 spin_lock(&srpc_data.rpc_glock);
1537 srpc_data.rpc_counters.rpcs_rcvd++;
1538 spin_unlock(&srpc_data.rpc_glock);
1539 break;
1540
1541 case SRPC_BULK_GET_RPLD:
1542 LASSERT (ev->type == LNET_EVENT_SEND ||
1543 ev->type == LNET_EVENT_REPLY ||
1544 ev->type == LNET_EVENT_UNLINK);
1545
1546 if (!ev->unlinked)
1547 break; /* wait for final event */
1548
1549 case SRPC_BULK_PUT_SENT:
1550 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1551 spin_lock(&srpc_data.rpc_glock);
1552
1553 if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1554 srpc_data.rpc_counters.bulk_get += ev->mlength;
1555 else
1556 srpc_data.rpc_counters.bulk_put += ev->mlength;
1557
1558 spin_unlock(&srpc_data.rpc_glock);
1559 }
1560 case SRPC_REPLY_SENT:
1561 srpc = rpcev->ev_data;
1562 scd = srpc->srpc_scd;
1563
1564 LASSERT(rpcev == &srpc->srpc_ev);
1565
1566 spin_lock(&scd->scd_lock);
1567
1568 rpcev->ev_fired = 1;
1569 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1570 -EINTR : ev->status;
1571 swi_schedule_workitem(&srpc->srpc_wi);
1572
1573 spin_unlock(&scd->scd_lock);
1574 break;
1575 }
1576 }
1577
1578
1579 int
1580 srpc_startup (void)
1581 {
1582 int rc;
1583
1584 memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1585 spin_lock_init(&srpc_data.rpc_glock);
1586
1587 /* 1 second pause to avoid timestamp reuse */
1588 set_current_state(TASK_UNINTERRUPTIBLE);
1589 schedule_timeout(cfs_time_seconds(1));
1590 srpc_data.rpc_matchbits = ((__u64) get_seconds()) << 48;
1591
1592 srpc_data.rpc_state = SRPC_STATE_NONE;
1593
1594 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1595 if (rc < 0) {
1596 CERROR ("LNetNIInit() has failed: %d\n", rc);
1597 return rc;
1598 }
1599
1600 srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1601
1602 LNetInvalidateHandle(&srpc_data.rpc_lnet_eq);
1603 rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1604 if (rc != 0) {
1605 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1606 goto bail;
1607 }
1608
1609 rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1610 LASSERT(rc == 0);
1611 rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1612 LASSERT(rc == 0);
1613
1614 srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1615
1616 rc = stt_startup();
1617
1618 bail:
1619 if (rc != 0)
1620 srpc_shutdown();
1621 else
1622 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1623
1624 return rc;
1625 }
1626
1627 void
1628 srpc_shutdown (void)
1629 {
1630 int i;
1631 int rc;
1632 int state;
1633
1634 state = srpc_data.rpc_state;
1635 srpc_data.rpc_state = SRPC_STATE_STOPPING;
1636
1637 switch (state) {
1638 default:
1639 LBUG ();
1640 case SRPC_STATE_RUNNING:
1641 spin_lock(&srpc_data.rpc_glock);
1642
1643 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1644 srpc_service_t *sv = srpc_data.rpc_services[i];
1645
1646 LASSERTF (sv == NULL,
1647 "service not empty: id %d, name %s\n",
1648 i, sv->sv_name);
1649 }
1650
1651 spin_unlock(&srpc_data.rpc_glock);
1652
1653 stt_shutdown();
1654
1655 case SRPC_STATE_EQ_INIT:
1656 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1657 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1658 LASSERT (rc == 0);
1659 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1660 LASSERT (rc == 0); /* the EQ should have no user by now */
1661
1662 case SRPC_STATE_NI_INIT:
1663 LNetNIFini();
1664 }
1665
1666 return;
1667 }
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