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staging: lustre: align all code properly for LNet core
[deliverable/linux.git] / drivers / staging / lustre / lnet / selftest / rpc.c
1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, 2015, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lnet/selftest/rpc.c
37 *
38 * Author: Isaac Huang <isaac@clusterfs.com>
39 *
40 * 2012-05-13: Liang Zhen <liang@whamcloud.com>
41 * - percpt data for service to improve smp performance
42 * - code cleanup
43 */
44
45 #define DEBUG_SUBSYSTEM S_LNET
46
47 #include "selftest.h"
48
49 typedef enum {
50 SRPC_STATE_NONE,
51 SRPC_STATE_NI_INIT,
52 SRPC_STATE_EQ_INIT,
53 SRPC_STATE_RUNNING,
54 SRPC_STATE_STOPPING,
55 } srpc_state_t;
56
57 static struct smoketest_rpc {
58 spinlock_t rpc_glock; /* global lock */
59 srpc_service_t *rpc_services[SRPC_SERVICE_MAX_ID + 1];
60 lnet_handle_eq_t rpc_lnet_eq; /* _the_ LNet event queue */
61 srpc_state_t rpc_state;
62 srpc_counters_t rpc_counters;
63 __u64 rpc_matchbits; /* matchbits counter */
64 } srpc_data;
65
66 static inline int
67 srpc_serv_portal(int svc_id)
68 {
69 return svc_id < SRPC_FRAMEWORK_SERVICE_MAX_ID ?
70 SRPC_FRAMEWORK_REQUEST_PORTAL : SRPC_REQUEST_PORTAL;
71 }
72
73 /* forward ref's */
74 int srpc_handle_rpc(swi_workitem_t *wi);
75
76 void srpc_get_counters(srpc_counters_t *cnt)
77 {
78 spin_lock(&srpc_data.rpc_glock);
79 *cnt = srpc_data.rpc_counters;
80 spin_unlock(&srpc_data.rpc_glock);
81 }
82
83 void srpc_set_counters(const srpc_counters_t *cnt)
84 {
85 spin_lock(&srpc_data.rpc_glock);
86 srpc_data.rpc_counters = *cnt;
87 spin_unlock(&srpc_data.rpc_glock);
88 }
89
90 static int
91 srpc_add_bulk_page(srpc_bulk_t *bk, struct page *pg, int i, int nob)
92 {
93 nob = min_t(int, nob, PAGE_CACHE_SIZE);
94
95 LASSERT(nob > 0);
96 LASSERT(i >= 0 && i < bk->bk_niov);
97
98 bk->bk_iovs[i].kiov_offset = 0;
99 bk->bk_iovs[i].kiov_page = pg;
100 bk->bk_iovs[i].kiov_len = nob;
101 return nob;
102 }
103
104 void
105 srpc_free_bulk(srpc_bulk_t *bk)
106 {
107 int i;
108 struct page *pg;
109
110 LASSERT(bk != NULL);
111
112 for (i = 0; i < bk->bk_niov; i++) {
113 pg = bk->bk_iovs[i].kiov_page;
114 if (pg == NULL)
115 break;
116
117 __free_page(pg);
118 }
119
120 LIBCFS_FREE(bk, offsetof(srpc_bulk_t, bk_iovs[bk->bk_niov]));
121 return;
122 }
123
124 srpc_bulk_t *
125 srpc_alloc_bulk(int cpt, unsigned bulk_npg, unsigned bulk_len, int sink)
126 {
127 srpc_bulk_t *bk;
128 int i;
129
130 LASSERT(bulk_npg > 0 && bulk_npg <= LNET_MAX_IOV);
131
132 LIBCFS_CPT_ALLOC(bk, lnet_cpt_table(), cpt,
133 offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
134 if (bk == NULL) {
135 CERROR("Can't allocate descriptor for %d pages\n", bulk_npg);
136 return NULL;
137 }
138
139 memset(bk, 0, offsetof(srpc_bulk_t, bk_iovs[bulk_npg]));
140 bk->bk_sink = sink;
141 bk->bk_len = bulk_len;
142 bk->bk_niov = bulk_npg;
143
144 for (i = 0; i < bulk_npg; i++) {
145 struct page *pg;
146 int nob;
147
148 pg = alloc_pages_node(cfs_cpt_spread_node(lnet_cpt_table(), cpt),
149 GFP_KERNEL, 0);
150 if (pg == NULL) {
151 CERROR("Can't allocate page %d of %d\n", i, bulk_npg);
152 srpc_free_bulk(bk);
153 return NULL;
154 }
155
156 nob = srpc_add_bulk_page(bk, pg, i, bulk_len);
157 bulk_len -= nob;
158 }
159
160 return bk;
161 }
162
163 static inline __u64
164 srpc_next_id(void)
165 {
166 __u64 id;
167
168 spin_lock(&srpc_data.rpc_glock);
169 id = srpc_data.rpc_matchbits++;
170 spin_unlock(&srpc_data.rpc_glock);
171 return id;
172 }
173
174 static void
175 srpc_init_server_rpc(struct srpc_server_rpc *rpc,
176 struct srpc_service_cd *scd,
177 struct srpc_buffer *buffer)
178 {
179 memset(rpc, 0, sizeof(*rpc));
180 swi_init_workitem(&rpc->srpc_wi, rpc, srpc_handle_rpc,
181 srpc_serv_is_framework(scd->scd_svc) ?
182 lst_sched_serial : lst_sched_test[scd->scd_cpt]);
183
184 rpc->srpc_ev.ev_fired = 1; /* no event expected now */
185
186 rpc->srpc_scd = scd;
187 rpc->srpc_reqstbuf = buffer;
188 rpc->srpc_peer = buffer->buf_peer;
189 rpc->srpc_self = buffer->buf_self;
190 LNetInvalidateHandle(&rpc->srpc_replymdh);
191 }
192
193 static void
194 srpc_service_fini(struct srpc_service *svc)
195 {
196 struct srpc_service_cd *scd;
197 struct srpc_server_rpc *rpc;
198 struct srpc_buffer *buf;
199 struct list_head *q;
200 int i;
201
202 if (svc->sv_cpt_data == NULL)
203 return;
204
205 cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
206 while (1) {
207 if (!list_empty(&scd->scd_buf_posted))
208 q = &scd->scd_buf_posted;
209 else if (!list_empty(&scd->scd_buf_blocked))
210 q = &scd->scd_buf_blocked;
211 else
212 break;
213
214 while (!list_empty(q)) {
215 buf = list_entry(q->next, 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 /*
281 * NB: don't use lst_sched_serial for adding buffer,
282 * see details in srpc_service_add_buffers()
283 */
284 swi_init_workitem(&scd->scd_buf_wi, scd,
285 srpc_add_buffer, lst_sched_test[i]);
286
287 if (i != 0 && srpc_serv_is_framework(svc)) {
288 /*
289 * NB: framework service only needs srpc_service_cd for
290 * one partition, but we allocate for all to make
291 * it easier to implement, it will waste a little
292 * memory but nobody should care about this
293 */
294 continue;
295 }
296
297 for (j = 0; j < nrpcs; j++) {
298 LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
299 i, sizeof(*rpc));
300 if (rpc == NULL) {
301 srpc_service_fini(svc);
302 return -ENOMEM;
303 }
304 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
305 }
306 }
307
308 return 0;
309 }
310
311 int
312 srpc_add_service(struct srpc_service *sv)
313 {
314 int id = sv->sv_id;
315
316 LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
317
318 if (srpc_service_init(sv) != 0)
319 return -ENOMEM;
320
321 spin_lock(&srpc_data.rpc_glock);
322
323 LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
324
325 if (srpc_data.rpc_services[id] != NULL) {
326 spin_unlock(&srpc_data.rpc_glock);
327 goto failed;
328 }
329
330 srpc_data.rpc_services[id] = sv;
331 spin_unlock(&srpc_data.rpc_glock);
332
333 CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
334 return 0;
335
336 failed:
337 srpc_service_fini(sv);
338 return -EBUSY;
339 }
340
341 int
342 srpc_remove_service(srpc_service_t *sv)
343 {
344 int id = sv->sv_id;
345
346 spin_lock(&srpc_data.rpc_glock);
347
348 if (srpc_data.rpc_services[id] != sv) {
349 spin_unlock(&srpc_data.rpc_glock);
350 return -ENOENT;
351 }
352
353 srpc_data.rpc_services[id] = NULL;
354 spin_unlock(&srpc_data.rpc_glock);
355 return 0;
356 }
357
358 static int
359 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
360 int len, int options, lnet_process_id_t peer,
361 lnet_handle_md_t *mdh, srpc_event_t *ev)
362 {
363 int rc;
364 lnet_md_t md;
365 lnet_handle_me_t meh;
366
367 rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
368 local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
369 if (rc != 0) {
370 CERROR("LNetMEAttach failed: %d\n", rc);
371 LASSERT(rc == -ENOMEM);
372 return -ENOMEM;
373 }
374
375 md.threshold = 1;
376 md.user_ptr = ev;
377 md.start = buf;
378 md.length = len;
379 md.options = options;
380 md.eq_handle = srpc_data.rpc_lnet_eq;
381
382 rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
383 if (rc != 0) {
384 CERROR("LNetMDAttach failed: %d\n", rc);
385 LASSERT(rc == -ENOMEM);
386
387 rc = LNetMEUnlink(meh);
388 LASSERT(rc == 0);
389 return -ENOMEM;
390 }
391
392 CDEBUG(D_NET, "Posted passive RDMA: peer %s, portal %d, matchbits %#llx\n",
393 libcfs_id2str(peer), portal, matchbits);
394 return 0;
395 }
396
397 static int
398 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
399 int options, lnet_process_id_t peer, lnet_nid_t self,
400 lnet_handle_md_t *mdh, srpc_event_t *ev)
401 {
402 int rc;
403 lnet_md_t md;
404
405 md.user_ptr = ev;
406 md.start = buf;
407 md.length = len;
408 md.eq_handle = srpc_data.rpc_lnet_eq;
409 md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
410 md.options = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
411
412 rc = LNetMDBind(md, LNET_UNLINK, mdh);
413 if (rc != 0) {
414 CERROR("LNetMDBind failed: %d\n", rc);
415 LASSERT(rc == -ENOMEM);
416 return -ENOMEM;
417 }
418
419 /*
420 * this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
421 * they're only meaningful for MDs attached to an ME (i.e. passive
422 * buffers...
423 */
424 if ((options & LNET_MD_OP_PUT) != 0) {
425 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
426 portal, matchbits, 0, 0);
427 } else {
428 LASSERT((options & LNET_MD_OP_GET) != 0);
429
430 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
431 }
432
433 if (rc != 0) {
434 CERROR("LNet%s(%s, %d, %lld) failed: %d\n",
435 ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
436 libcfs_id2str(peer), portal, matchbits, rc);
437
438 /*
439 * The forthcoming unlink event will complete this operation
440 * with failure, so fall through and return success here.
441 */
442 rc = LNetMDUnlink(*mdh);
443 LASSERT(rc == 0);
444 } else {
445 CDEBUG(D_NET, "Posted active RDMA: peer %s, portal %u, matchbits %#llx\n",
446 libcfs_id2str(peer), portal, matchbits);
447 }
448 return 0;
449 }
450
451 static int
452 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
453 lnet_handle_md_t *mdh, srpc_event_t *ev)
454 {
455 lnet_process_id_t any = {0};
456
457 any.nid = LNET_NID_ANY;
458 any.pid = LNET_PID_ANY;
459
460 return srpc_post_passive_rdma(srpc_serv_portal(service),
461 local, service, buf, len,
462 LNET_MD_OP_PUT, any, mdh, ev);
463 }
464
465 static int
466 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
467 __must_hold(&scd->scd_lock)
468 {
469 struct srpc_service *sv = scd->scd_svc;
470 struct srpc_msg *msg = &buf->buf_msg;
471 int rc;
472
473 LNetInvalidateHandle(&buf->buf_mdh);
474 list_add(&buf->buf_list, &scd->scd_buf_posted);
475 scd->scd_buf_nposted++;
476 spin_unlock(&scd->scd_lock);
477
478 rc = srpc_post_passive_rqtbuf(sv->sv_id,
479 !srpc_serv_is_framework(sv),
480 msg, sizeof(*msg), &buf->buf_mdh,
481 &scd->scd_ev);
482
483 /*
484 * At this point, a RPC (new or delayed) may have arrived in
485 * msg and its event handler has been called. So we must add
486 * buf to scd_buf_posted _before_ dropping scd_lock
487 */
488 spin_lock(&scd->scd_lock);
489
490 if (rc == 0) {
491 if (!sv->sv_shuttingdown)
492 return 0;
493
494 spin_unlock(&scd->scd_lock);
495 /*
496 * srpc_shutdown_service might have tried to unlink me
497 * when my buf_mdh was still invalid
498 */
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 /*
525 * it's called by workitem scheduler threads, these threads
526 * should have been set CPT affinity, so buffers will be posted
527 * on CPT local list of Portal
528 */
529 spin_lock(&scd->scd_lock);
530
531 while (scd->scd_buf_adjust > 0 &&
532 !scd->scd_svc->sv_shuttingdown) {
533 scd->scd_buf_adjust--; /* consume it */
534 scd->scd_buf_posting++;
535
536 spin_unlock(&scd->scd_lock);
537
538 LIBCFS_ALLOC(buf, sizeof(*buf));
539 if (buf == NULL) {
540 CERROR("Failed to add new buf to service: %s\n",
541 scd->scd_svc->sv_name);
542 spin_lock(&scd->scd_lock);
543 rc = -ENOMEM;
544 break;
545 }
546
547 spin_lock(&scd->scd_lock);
548 if (scd->scd_svc->sv_shuttingdown) {
549 spin_unlock(&scd->scd_lock);
550 LIBCFS_FREE(buf, sizeof(*buf));
551
552 spin_lock(&scd->scd_lock);
553 rc = -ESHUTDOWN;
554 break;
555 }
556
557 rc = srpc_service_post_buffer(scd, buf);
558 if (rc != 0)
559 break; /* buf has been freed inside */
560
561 LASSERT(scd->scd_buf_posting > 0);
562 scd->scd_buf_posting--;
563 scd->scd_buf_total++;
564 scd->scd_buf_low = max(2, scd->scd_buf_total / 4);
565 }
566
567 if (rc != 0) {
568 scd->scd_buf_err_stamp = ktime_get_real_seconds();
569 scd->scd_buf_err = rc;
570
571 LASSERT(scd->scd_buf_posting > 0);
572 scd->scd_buf_posting--;
573 }
574
575 spin_unlock(&scd->scd_lock);
576 return 0;
577 }
578
579 int
580 srpc_service_add_buffers(struct srpc_service *sv, int nbuffer)
581 {
582 struct srpc_service_cd *scd;
583 int rc = 0;
584 int i;
585
586 LASSERTF(nbuffer > 0, "nbuffer must be positive: %d\n", nbuffer);
587
588 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
589 spin_lock(&scd->scd_lock);
590
591 scd->scd_buf_err = 0;
592 scd->scd_buf_err_stamp = 0;
593 scd->scd_buf_posting = 0;
594 scd->scd_buf_adjust = nbuffer;
595 /* start to post buffers */
596 swi_schedule_workitem(&scd->scd_buf_wi);
597 spin_unlock(&scd->scd_lock);
598
599 /* framework service only post buffer for one partition */
600 if (srpc_serv_is_framework(sv))
601 break;
602 }
603
604 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
605 spin_lock(&scd->scd_lock);
606 /*
607 * NB: srpc_service_add_buffers() can be called inside
608 * thread context of lst_sched_serial, and we don't normally
609 * allow to sleep inside thread context of WI scheduler
610 * because it will block current scheduler thread from doing
611 * anything else, even worse, it could deadlock if it's
612 * waiting on result from another WI of the same scheduler.
613 * However, it's safe at here because scd_buf_wi is scheduled
614 * by thread in a different WI scheduler (lst_sched_test),
615 * so we don't have any risk of deadlock, though this could
616 * block all WIs pending on lst_sched_serial for a moment
617 * which is not good but not fatal.
618 */
619 lst_wait_until(scd->scd_buf_err != 0 ||
620 (scd->scd_buf_adjust == 0 &&
621 scd->scd_buf_posting == 0),
622 scd->scd_lock, "waiting for adding buffer\n");
623
624 if (scd->scd_buf_err != 0 && rc == 0)
625 rc = scd->scd_buf_err;
626
627 spin_unlock(&scd->scd_lock);
628 }
629
630 return rc;
631 }
632
633 void
634 srpc_service_remove_buffers(struct srpc_service *sv, int nbuffer)
635 {
636 struct srpc_service_cd *scd;
637 int num;
638 int i;
639
640 LASSERT(!sv->sv_shuttingdown);
641
642 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
643 spin_lock(&scd->scd_lock);
644
645 num = scd->scd_buf_total + scd->scd_buf_posting;
646 scd->scd_buf_adjust -= min(nbuffer, num);
647
648 spin_unlock(&scd->scd_lock);
649 }
650 }
651
652 /* returns 1 if sv has finished, otherwise 0 */
653 int
654 srpc_finish_service(struct srpc_service *sv)
655 {
656 struct srpc_service_cd *scd;
657 struct srpc_server_rpc *rpc;
658 int i;
659
660 LASSERT(sv->sv_shuttingdown); /* srpc_shutdown_service called */
661
662 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
663 spin_lock(&scd->scd_lock);
664 if (!swi_deschedule_workitem(&scd->scd_buf_wi)) {
665 spin_unlock(&scd->scd_lock);
666 return 0;
667 }
668
669 if (scd->scd_buf_nposted > 0) {
670 CDEBUG(D_NET, "waiting for %d posted buffers to unlink",
671 scd->scd_buf_nposted);
672 spin_unlock(&scd->scd_lock);
673 return 0;
674 }
675
676 if (list_empty(&scd->scd_rpc_active)) {
677 spin_unlock(&scd->scd_lock);
678 continue;
679 }
680
681 rpc = list_entry(scd->scd_rpc_active.next,
682 struct srpc_server_rpc, srpc_list);
683 CNETERR("Active RPC %p on shutdown: sv %s, peer %s, wi %s scheduled %d running %d, ev fired %d type %d status %d lnet %d\n",
684 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
685 swi_state2str(rpc->srpc_wi.swi_state),
686 rpc->srpc_wi.swi_workitem.wi_scheduled,
687 rpc->srpc_wi.swi_workitem.wi_running,
688 rpc->srpc_ev.ev_fired, rpc->srpc_ev.ev_type,
689 rpc->srpc_ev.ev_status, rpc->srpc_ev.ev_lnet);
690 spin_unlock(&scd->scd_lock);
691 return 0;
692 }
693
694 /* no lock needed from now on */
695 srpc_service_fini(sv);
696 return 1;
697 }
698
699 /* called with sv->sv_lock held */
700 static void
701 srpc_service_recycle_buffer(struct srpc_service_cd *scd, srpc_buffer_t *buf)
702 __must_hold(&scd->scd_lock)
703 {
704 if (!scd->scd_svc->sv_shuttingdown && scd->scd_buf_adjust >= 0) {
705 if (srpc_service_post_buffer(scd, buf) != 0) {
706 CWARN("Failed to post %s buffer\n",
707 scd->scd_svc->sv_name);
708 }
709 return;
710 }
711
712 /* service is shutting down, or we want to recycle some buffers */
713 scd->scd_buf_total--;
714
715 if (scd->scd_buf_adjust < 0) {
716 scd->scd_buf_adjust++;
717 if (scd->scd_buf_adjust < 0 &&
718 scd->scd_buf_total == 0 && scd->scd_buf_posting == 0) {
719 CDEBUG(D_INFO,
720 "Try to recycle %d buffers but nothing left\n",
721 scd->scd_buf_adjust);
722 scd->scd_buf_adjust = 0;
723 }
724 }
725
726 spin_unlock(&scd->scd_lock);
727 LIBCFS_FREE(buf, sizeof(*buf));
728 spin_lock(&scd->scd_lock);
729 }
730
731 void
732 srpc_abort_service(struct srpc_service *sv)
733 {
734 struct srpc_service_cd *scd;
735 struct srpc_server_rpc *rpc;
736 int i;
737
738 CDEBUG(D_NET, "Aborting service: id %d, name %s\n",
739 sv->sv_id, sv->sv_name);
740
741 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
742 spin_lock(&scd->scd_lock);
743
744 /*
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(srpc_service_t *sv)
760 {
761 struct srpc_service_cd *scd;
762 struct srpc_server_rpc *rpc;
763 srpc_buffer_t *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(srpc_client_rpc_t *rpc)
797 {
798 srpc_event_t *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(srpc_msg_t), LNET_MD_OP_PUT,
808 rpc->crpc_dest, LNET_NID_ANY,
809 &rpc->crpc_reqstmdh, ev);
810 if (rc != 0) {
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(srpc_client_rpc_t *rpc)
819 {
820 srpc_event_t *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, sizeof(srpc_msg_t),
832 LNET_MD_OP_PUT, rpc->crpc_dest,
833 &rpc->crpc_replymdh, ev);
834 if (rc != 0) {
835 LASSERT(rc == -ENOMEM);
836 ev->ev_fired = 1; /* no more event expected */
837 }
838 return rc;
839 }
840
841 static int
842 srpc_prepare_bulk(srpc_client_rpc_t *rpc)
843 {
844 srpc_bulk_t *bk = &rpc->crpc_bulk;
845 srpc_event_t *ev = &rpc->crpc_bulkev;
846 __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
847 int rc;
848 int opt;
849
850 LASSERT(bk->bk_niov <= LNET_MAX_IOV);
851
852 if (bk->bk_niov == 0)
853 return 0; /* nothing to do */
854
855 opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
856 opt |= LNET_MD_KIOV;
857
858 ev->ev_fired = 0;
859 ev->ev_data = rpc;
860 ev->ev_type = SRPC_BULK_REQ_RCVD;
861
862 *id = srpc_next_id();
863
864 rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
865 &bk->bk_iovs[0], bk->bk_niov, opt,
866 rpc->crpc_dest, &bk->bk_mdh, ev);
867 if (rc != 0) {
868 LASSERT(rc == -ENOMEM);
869 ev->ev_fired = 1; /* no more event expected */
870 }
871 return rc;
872 }
873
874 static int
875 srpc_do_bulk(struct srpc_server_rpc *rpc)
876 {
877 srpc_event_t *ev = &rpc->srpc_ev;
878 srpc_bulk_t *bk = rpc->srpc_bulk;
879 __u64 id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
880 int rc;
881 int opt;
882
883 LASSERT(bk != NULL);
884
885 opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
886 opt |= LNET_MD_KIOV;
887
888 ev->ev_fired = 0;
889 ev->ev_data = rpc;
890 ev->ev_type = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
891
892 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
893 &bk->bk_iovs[0], bk->bk_niov, opt,
894 rpc->srpc_peer, rpc->srpc_self,
895 &bk->bk_mdh, ev);
896 if (rc != 0)
897 ev->ev_fired = 1; /* no more event expected */
898 return rc;
899 }
900
901 /* only called from srpc_handle_rpc */
902 static void
903 srpc_server_rpc_done(struct srpc_server_rpc *rpc, int status)
904 {
905 struct srpc_service_cd *scd = rpc->srpc_scd;
906 struct srpc_service *sv = scd->scd_svc;
907 srpc_buffer_t *buffer;
908
909 LASSERT(status != 0 || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
910
911 rpc->srpc_status = status;
912
913 CDEBUG_LIMIT(status == 0 ? D_NET : D_NETERROR,
914 "Server RPC %p done: service %s, peer %s, status %s:%d\n",
915 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
916 swi_state2str(rpc->srpc_wi.swi_state), status);
917
918 if (status != 0) {
919 spin_lock(&srpc_data.rpc_glock);
920 srpc_data.rpc_counters.rpcs_dropped++;
921 spin_unlock(&srpc_data.rpc_glock);
922 }
923
924 if (rpc->srpc_done != NULL)
925 (*rpc->srpc_done) (rpc);
926 LASSERT(rpc->srpc_bulk == NULL);
927
928 spin_lock(&scd->scd_lock);
929
930 if (rpc->srpc_reqstbuf != NULL) {
931 /*
932 * NB might drop sv_lock in srpc_service_recycle_buffer, but
933 * sv won't go away for scd_rpc_active must not be empty
934 */
935 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
936 rpc->srpc_reqstbuf = NULL;
937 }
938
939 list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
940
941 /*
942 * No one can schedule me now since:
943 * - I'm not on scd_rpc_active.
944 * - all LNet events have been fired.
945 * Cancel pending schedules and prevent future schedule attempts:
946 */
947 LASSERT(rpc->srpc_ev.ev_fired);
948 swi_exit_workitem(&rpc->srpc_wi);
949
950 if (!sv->sv_shuttingdown && !list_empty(&scd->scd_buf_blocked)) {
951 buffer = list_entry(scd->scd_buf_blocked.next,
952 srpc_buffer_t, buf_list);
953 list_del(&buffer->buf_list);
954
955 srpc_init_server_rpc(rpc, scd, buffer);
956 list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
957 swi_schedule_workitem(&rpc->srpc_wi);
958 } else {
959 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
960 }
961
962 spin_unlock(&scd->scd_lock);
963 return;
964 }
965
966 /* handles an incoming RPC */
967 int
968 srpc_handle_rpc(swi_workitem_t *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 srpc_event_t *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 != NULL)
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 srpc_msg_t *msg;
1001 srpc_generic_reply_t *reply;
1002
1003 msg = &rpc->srpc_reqstbuf->buf_msg;
1004 reply = &rpc->srpc_replymsg.msg_body.reply;
1005
1006 if (msg->msg_magic == 0) {
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 == 0 || !rpc->srpc_bulk);
1023 if (rc != 0) {
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 != NULL) {
1032 rc = srpc_do_bulk(rpc);
1033 if (rc == 0)
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 == NULL || ev->ev_fired);
1042
1043 if (rpc->srpc_bulk != NULL) {
1044 rc = ev->ev_status;
1045
1046 if (sv->sv_bulk_ready != NULL)
1047 rc = (*sv->sv_bulk_ready) (rpc, rc);
1048
1049 if (rc != 0) {
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 == 0)
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 srpc_client_rpc_t *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 inline void
1101 srpc_add_client_rpc_timer(srpc_client_rpc_t *rpc)
1102 {
1103 stt_timer_t *timer = &rpc->crpc_timer;
1104
1105 if (rpc->crpc_timeout == 0)
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 return;
1114 }
1115
1116 /*
1117 * Called with rpc->crpc_lock held.
1118 *
1119 * Upon exit the RPC expiry timer is not queued and the handler is not
1120 * running on any CPU.
1121 */
1122 static void
1123 srpc_del_client_rpc_timer(srpc_client_rpc_t *rpc)
1124 {
1125 /* timer not planted or already exploded */
1126 if (rpc->crpc_timeout == 0)
1127 return;
1128
1129 /* timer successfully defused */
1130 if (stt_del_timer(&rpc->crpc_timer))
1131 return;
1132
1133 /* timer detonated, wait for it to explode */
1134 while (rpc->crpc_timeout != 0) {
1135 spin_unlock(&rpc->crpc_lock);
1136
1137 schedule();
1138
1139 spin_lock(&rpc->crpc_lock);
1140 }
1141 }
1142
1143 static void
1144 srpc_client_rpc_done(srpc_client_rpc_t *rpc, int status)
1145 {
1146 swi_workitem_t *wi = &rpc->crpc_wi;
1147
1148 LASSERT(status != 0 || wi->swi_state == SWI_STATE_DONE);
1149
1150 spin_lock(&rpc->crpc_lock);
1151
1152 rpc->crpc_closed = 1;
1153 if (rpc->crpc_status == 0)
1154 rpc->crpc_status = status;
1155
1156 srpc_del_client_rpc_timer(rpc);
1157
1158 CDEBUG_LIMIT((status == 0) ? D_NET : D_NETERROR,
1159 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1160 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1161 swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1162
1163 /*
1164 * No one can schedule me now since:
1165 * - RPC timer has been defused.
1166 * - all LNet events have been fired.
1167 * - crpc_closed has been set, preventing srpc_abort_rpc from
1168 * scheduling me.
1169 * Cancel pending schedules and prevent future schedule attempts:
1170 */
1171 LASSERT(!srpc_event_pending(rpc));
1172 swi_exit_workitem(wi);
1173
1174 spin_unlock(&rpc->crpc_lock);
1175
1176 (*rpc->crpc_done)(rpc);
1177 return;
1178 }
1179
1180 /* sends an outgoing RPC */
1181 int
1182 srpc_send_rpc(swi_workitem_t *wi)
1183 {
1184 int rc = 0;
1185 srpc_client_rpc_t *rpc;
1186 srpc_msg_t *reply;
1187 int do_bulk;
1188
1189 LASSERT(wi != NULL);
1190
1191 rpc = wi->swi_workitem.wi_data;
1192
1193 LASSERT(rpc != NULL);
1194 LASSERT(wi == &rpc->crpc_wi);
1195
1196 reply = &rpc->crpc_replymsg;
1197 do_bulk = rpc->crpc_bulk.bk_niov > 0;
1198
1199 spin_lock(&rpc->crpc_lock);
1200
1201 if (rpc->crpc_aborted) {
1202 spin_unlock(&rpc->crpc_lock);
1203 goto abort;
1204 }
1205
1206 spin_unlock(&rpc->crpc_lock);
1207
1208 switch (wi->swi_state) {
1209 default:
1210 LBUG();
1211 case SWI_STATE_NEWBORN:
1212 LASSERT(!srpc_event_pending(rpc));
1213
1214 rc = srpc_prepare_reply(rpc);
1215 if (rc != 0) {
1216 srpc_client_rpc_done(rpc, rc);
1217 return 1;
1218 }
1219
1220 rc = srpc_prepare_bulk(rpc);
1221 if (rc != 0)
1222 break;
1223
1224 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1225 rc = srpc_send_request(rpc);
1226 break;
1227
1228 case SWI_STATE_REQUEST_SUBMITTED:
1229 /*
1230 * CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1231 * order; however, they're processed in a strict order:
1232 * rqt, rpy, and bulk.
1233 */
1234 if (!rpc->crpc_reqstev.ev_fired)
1235 break;
1236
1237 rc = rpc->crpc_reqstev.ev_status;
1238 if (rc != 0)
1239 break;
1240
1241 wi->swi_state = SWI_STATE_REQUEST_SENT;
1242 /* perhaps more events, fall thru */
1243 case SWI_STATE_REQUEST_SENT: {
1244 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1245
1246 if (!rpc->crpc_replyev.ev_fired)
1247 break;
1248
1249 rc = rpc->crpc_replyev.ev_status;
1250 if (rc != 0)
1251 break;
1252
1253 srpc_unpack_msg_hdr(reply);
1254 if (reply->msg_type != type ||
1255 (reply->msg_magic != SRPC_MSG_MAGIC &&
1256 reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1257 CWARN("Bad message from %s: type %u (%d expected), magic %u (%d expected).\n",
1258 libcfs_id2str(rpc->crpc_dest),
1259 reply->msg_type, type,
1260 reply->msg_magic, SRPC_MSG_MAGIC);
1261 rc = -EBADMSG;
1262 break;
1263 }
1264
1265 if (do_bulk && reply->msg_body.reply.status != 0) {
1266 CWARN("Remote error %d at %s, unlink bulk buffer in case peer didn't initiate bulk transfer\n",
1267 reply->msg_body.reply.status,
1268 libcfs_id2str(rpc->crpc_dest));
1269 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1270 }
1271
1272 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1273 }
1274 case SWI_STATE_REPLY_RECEIVED:
1275 if (do_bulk && !rpc->crpc_bulkev.ev_fired)
1276 break;
1277
1278 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1279
1280 /*
1281 * Bulk buffer was unlinked due to remote error. Clear error
1282 * since reply buffer still contains valid data.
1283 * NB rpc->crpc_done shouldn't look into bulk data in case of
1284 * remote error.
1285 */
1286 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1287 rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1288 rc = 0;
1289
1290 wi->swi_state = SWI_STATE_DONE;
1291 srpc_client_rpc_done(rpc, rc);
1292 return 1;
1293 }
1294
1295 if (rc != 0) {
1296 spin_lock(&rpc->crpc_lock);
1297 srpc_abort_rpc(rpc, rc);
1298 spin_unlock(&rpc->crpc_lock);
1299 }
1300
1301 abort:
1302 if (rpc->crpc_aborted) {
1303 LNetMDUnlink(rpc->crpc_reqstmdh);
1304 LNetMDUnlink(rpc->crpc_replymdh);
1305 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1306
1307 if (!srpc_event_pending(rpc)) {
1308 srpc_client_rpc_done(rpc, -EINTR);
1309 return 1;
1310 }
1311 }
1312 return 0;
1313 }
1314
1315 srpc_client_rpc_t *
1316 srpc_create_client_rpc(lnet_process_id_t peer, int service,
1317 int nbulkiov, int bulklen,
1318 void (*rpc_done)(srpc_client_rpc_t *),
1319 void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1320 {
1321 srpc_client_rpc_t *rpc;
1322
1323 LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1324 crpc_bulk.bk_iovs[nbulkiov]));
1325 if (rpc == NULL)
1326 return NULL;
1327
1328 srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1329 bulklen, rpc_done, rpc_fini, priv);
1330 return rpc;
1331 }
1332
1333 /* called with rpc->crpc_lock held */
1334 void
1335 srpc_abort_rpc(srpc_client_rpc_t *rpc, int why)
1336 {
1337 LASSERT(why != 0);
1338
1339 if (rpc->crpc_aborted || /* already aborted */
1340 rpc->crpc_closed) /* callback imminent */
1341 return;
1342
1343 CDEBUG(D_NET, "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1344 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1345 swi_state2str(rpc->crpc_wi.swi_state), why);
1346
1347 rpc->crpc_aborted = 1;
1348 rpc->crpc_status = why;
1349 swi_schedule_workitem(&rpc->crpc_wi);
1350 return;
1351 }
1352
1353 /* called with rpc->crpc_lock held */
1354 void
1355 srpc_post_rpc(srpc_client_rpc_t *rpc)
1356 {
1357 LASSERT(!rpc->crpc_aborted);
1358 LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
1359
1360 CDEBUG(D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1361 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1362 rpc->crpc_timeout);
1363
1364 srpc_add_client_rpc_timer(rpc);
1365 swi_schedule_workitem(&rpc->crpc_wi);
1366 return;
1367 }
1368
1369 int
1370 srpc_send_reply(struct srpc_server_rpc *rpc)
1371 {
1372 srpc_event_t *ev = &rpc->srpc_ev;
1373 struct srpc_msg *msg = &rpc->srpc_replymsg;
1374 struct srpc_buffer *buffer = rpc->srpc_reqstbuf;
1375 struct srpc_service_cd *scd = rpc->srpc_scd;
1376 struct srpc_service *sv = scd->scd_svc;
1377 __u64 rpyid;
1378 int rc;
1379
1380 LASSERT(buffer != NULL);
1381 rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1382
1383 spin_lock(&scd->scd_lock);
1384
1385 if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1386 /*
1387 * Repost buffer before replying since test client
1388 * might send me another RPC once it gets the reply
1389 */
1390 if (srpc_service_post_buffer(scd, buffer) != 0)
1391 CWARN("Failed to repost %s buffer\n", sv->sv_name);
1392 rpc->srpc_reqstbuf = NULL;
1393 }
1394
1395 spin_unlock(&scd->scd_lock);
1396
1397 ev->ev_fired = 0;
1398 ev->ev_data = rpc;
1399 ev->ev_type = SRPC_REPLY_SENT;
1400
1401 msg->msg_magic = SRPC_MSG_MAGIC;
1402 msg->msg_version = SRPC_MSG_VERSION;
1403 msg->msg_type = srpc_service2reply(sv->sv_id);
1404
1405 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1406 sizeof(*msg), LNET_MD_OP_PUT,
1407 rpc->srpc_peer, rpc->srpc_self,
1408 &rpc->srpc_replymdh, ev);
1409 if (rc != 0)
1410 ev->ev_fired = 1; /* no more event expected */
1411 return rc;
1412 }
1413
1414 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1415 static void
1416 srpc_lnet_ev_handler(lnet_event_t *ev)
1417 {
1418 struct srpc_service_cd *scd;
1419 srpc_event_t *rpcev = ev->md.user_ptr;
1420 srpc_client_rpc_t *crpc;
1421 struct srpc_server_rpc *srpc;
1422 srpc_buffer_t *buffer;
1423 srpc_service_t *sv;
1424 srpc_msg_t *msg;
1425 srpc_msg_type_t type;
1426
1427 LASSERT(!in_interrupt());
1428
1429 if (ev->status != 0) {
1430 spin_lock(&srpc_data.rpc_glock);
1431 srpc_data.rpc_counters.errors++;
1432 spin_unlock(&srpc_data.rpc_glock);
1433 }
1434
1435 rpcev->ev_lnet = ev->type;
1436
1437 switch (rpcev->ev_type) {
1438 default:
1439 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1440 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1441 LBUG();
1442 case SRPC_REQUEST_SENT:
1443 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1444 spin_lock(&srpc_data.rpc_glock);
1445 srpc_data.rpc_counters.rpcs_sent++;
1446 spin_unlock(&srpc_data.rpc_glock);
1447 }
1448 case SRPC_REPLY_RCVD:
1449 case SRPC_BULK_REQ_RCVD:
1450 crpc = rpcev->ev_data;
1451
1452 if (rpcev != &crpc->crpc_reqstev &&
1453 rpcev != &crpc->crpc_replyev &&
1454 rpcev != &crpc->crpc_bulkev) {
1455 CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1456 rpcev, crpc, &crpc->crpc_reqstev,
1457 &crpc->crpc_replyev, &crpc->crpc_bulkev);
1458 CERROR("Bad event: status %d, type %d, lnet %d\n",
1459 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1460 LBUG();
1461 }
1462
1463 spin_lock(&crpc->crpc_lock);
1464
1465 LASSERT(rpcev->ev_fired == 0);
1466 rpcev->ev_fired = 1;
1467 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1468 -EINTR : ev->status;
1469 swi_schedule_workitem(&crpc->crpc_wi);
1470
1471 spin_unlock(&crpc->crpc_lock);
1472 break;
1473
1474 case SRPC_REQUEST_RCVD:
1475 scd = rpcev->ev_data;
1476 sv = scd->scd_svc;
1477
1478 LASSERT(rpcev == &scd->scd_ev);
1479
1480 spin_lock(&scd->scd_lock);
1481
1482 LASSERT(ev->unlinked);
1483 LASSERT(ev->type == LNET_EVENT_PUT ||
1484 ev->type == LNET_EVENT_UNLINK);
1485 LASSERT(ev->type != LNET_EVENT_UNLINK ||
1486 sv->sv_shuttingdown);
1487
1488 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1489 buffer->buf_peer = ev->initiator;
1490 buffer->buf_self = ev->target.nid;
1491
1492 LASSERT(scd->scd_buf_nposted > 0);
1493 scd->scd_buf_nposted--;
1494
1495 if (sv->sv_shuttingdown) {
1496 /*
1497 * Leave buffer on scd->scd_buf_nposted since
1498 * srpc_finish_service needs to traverse it.
1499 */
1500 spin_unlock(&scd->scd_lock);
1501 break;
1502 }
1503
1504 if (scd->scd_buf_err_stamp != 0 &&
1505 scd->scd_buf_err_stamp < ktime_get_real_seconds()) {
1506 /* re-enable adding buffer */
1507 scd->scd_buf_err_stamp = 0;
1508 scd->scd_buf_err = 0;
1509 }
1510
1511 if (scd->scd_buf_err == 0 && /* adding buffer is enabled */
1512 scd->scd_buf_adjust == 0 &&
1513 scd->scd_buf_nposted < scd->scd_buf_low) {
1514 scd->scd_buf_adjust = max(scd->scd_buf_total / 2,
1515 SFW_TEST_WI_MIN);
1516 swi_schedule_workitem(&scd->scd_buf_wi);
1517 }
1518
1519 list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1520 msg = &buffer->buf_msg;
1521 type = srpc_service2request(sv->sv_id);
1522
1523 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1524 (msg->msg_type != type &&
1525 msg->msg_type != __swab32(type)) ||
1526 (msg->msg_magic != SRPC_MSG_MAGIC &&
1527 msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1528 CERROR("Dropping RPC (%s) from %s: status %d mlength %d type %u magic %u.\n",
1529 sv->sv_name, libcfs_id2str(ev->initiator),
1530 ev->status, ev->mlength,
1531 msg->msg_type, msg->msg_magic);
1532
1533 /*
1534 * NB can't call srpc_service_recycle_buffer here since
1535 * it may call LNetM[DE]Attach. The invalid magic tells
1536 * srpc_handle_rpc to drop this RPC
1537 */
1538 msg->msg_magic = 0;
1539 }
1540
1541 if (!list_empty(&scd->scd_rpc_free)) {
1542 srpc = list_entry(scd->scd_rpc_free.next,
1543 struct srpc_server_rpc,
1544 srpc_list);
1545 list_del(&srpc->srpc_list);
1546
1547 srpc_init_server_rpc(srpc, scd, buffer);
1548 list_add_tail(&srpc->srpc_list,
1549 &scd->scd_rpc_active);
1550 swi_schedule_workitem(&srpc->srpc_wi);
1551 } else {
1552 list_add_tail(&buffer->buf_list,
1553 &scd->scd_buf_blocked);
1554 }
1555
1556 spin_unlock(&scd->scd_lock);
1557
1558 spin_lock(&srpc_data.rpc_glock);
1559 srpc_data.rpc_counters.rpcs_rcvd++;
1560 spin_unlock(&srpc_data.rpc_glock);
1561 break;
1562
1563 case SRPC_BULK_GET_RPLD:
1564 LASSERT(ev->type == LNET_EVENT_SEND ||
1565 ev->type == LNET_EVENT_REPLY ||
1566 ev->type == LNET_EVENT_UNLINK);
1567
1568 if (!ev->unlinked)
1569 break; /* wait for final event */
1570
1571 case SRPC_BULK_PUT_SENT:
1572 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1573 spin_lock(&srpc_data.rpc_glock);
1574
1575 if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1576 srpc_data.rpc_counters.bulk_get += ev->mlength;
1577 else
1578 srpc_data.rpc_counters.bulk_put += ev->mlength;
1579
1580 spin_unlock(&srpc_data.rpc_glock);
1581 }
1582 case SRPC_REPLY_SENT:
1583 srpc = rpcev->ev_data;
1584 scd = srpc->srpc_scd;
1585
1586 LASSERT(rpcev == &srpc->srpc_ev);
1587
1588 spin_lock(&scd->scd_lock);
1589
1590 rpcev->ev_fired = 1;
1591 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1592 -EINTR : ev->status;
1593 swi_schedule_workitem(&srpc->srpc_wi);
1594
1595 spin_unlock(&scd->scd_lock);
1596 break;
1597 }
1598 }
1599
1600 int
1601 srpc_startup(void)
1602 {
1603 int rc;
1604
1605 memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1606 spin_lock_init(&srpc_data.rpc_glock);
1607
1608 /* 1 second pause to avoid timestamp reuse */
1609 set_current_state(TASK_UNINTERRUPTIBLE);
1610 schedule_timeout(cfs_time_seconds(1));
1611 srpc_data.rpc_matchbits = ((__u64)ktime_get_real_seconds()) << 48;
1612
1613 srpc_data.rpc_state = SRPC_STATE_NONE;
1614
1615 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1616 if (rc < 0) {
1617 CERROR("LNetNIInit() has failed: %d\n", rc);
1618 return rc;
1619 }
1620
1621 srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1622
1623 LNetInvalidateHandle(&srpc_data.rpc_lnet_eq);
1624 rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1625 if (rc != 0) {
1626 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1627 goto bail;
1628 }
1629
1630 rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1631 LASSERT(rc == 0);
1632 rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1633 LASSERT(rc == 0);
1634
1635 srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1636
1637 rc = stt_startup();
1638
1639 bail:
1640 if (rc != 0)
1641 srpc_shutdown();
1642 else
1643 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1644
1645 return rc;
1646 }
1647
1648 void
1649 srpc_shutdown(void)
1650 {
1651 int i;
1652 int rc;
1653 int state;
1654
1655 state = srpc_data.rpc_state;
1656 srpc_data.rpc_state = SRPC_STATE_STOPPING;
1657
1658 switch (state) {
1659 default:
1660 LBUG();
1661 case SRPC_STATE_RUNNING:
1662 spin_lock(&srpc_data.rpc_glock);
1663
1664 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1665 srpc_service_t *sv = srpc_data.rpc_services[i];
1666
1667 LASSERTF(sv == NULL,
1668 "service not empty: id %d, name %s\n",
1669 i, sv->sv_name);
1670 }
1671
1672 spin_unlock(&srpc_data.rpc_glock);
1673
1674 stt_shutdown();
1675
1676 case SRPC_STATE_EQ_INIT:
1677 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1678 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1679 LASSERT(rc == 0);
1680 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1681 LASSERT(rc == 0); /* the EQ should have no user by now */
1682
1683 case SRPC_STATE_NI_INIT:
1684 LNetNIFini();
1685 }
1686
1687 return;
1688 }
Linux kernel - Deliverables
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