1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lnet/selftest/rpc.c
37 *
38 * Author: Isaac Huang <isaac@clusterfs.com>
39 *
40 * 2012-05-13: Liang Zhen <liang@whamcloud.com>
41 * - percpt data for service to improve smp performance
42 * - code cleanup
43 */
44
45 #define DEBUG_SUBSYSTEM S_LNET
46
47 #include "selftest.h"
48
49 typedef enum {
50 SRPC_STATE_NONE,
51 SRPC_STATE_NI_INIT,
52 SRPC_STATE_EQ_INIT,
53 SRPC_STATE_RUNNING,
54 SRPC_STATE_STOPPING,
55 } srpc_state_t;
56
57 static struct smoketest_rpc {
58 spinlock_t rpc_glock; /* global lock */
59 srpc_service_t *rpc_services[SRPC_SERVICE_MAX_ID + 1];
60 lnet_handle_eq_t rpc_lnet_eq; /* _the_ LNet event queue */
61 srpc_state_t rpc_state;
62 srpc_counters_t rpc_counters;
63 __u64 rpc_matchbits; /* matchbits counter */
64 } srpc_data;
65
66 static inline int
srpc_serv_portal(int svc_id)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
srpc_get_counters(srpc_counters_t * cnt)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
srpc_set_counters(const srpc_counters_t * cnt)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
srpc_add_bulk_page(srpc_bulk_t * bk,struct page * pg,int i,int nob)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
srpc_free_bulk(srpc_bulk_t * bk)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 *
srpc_alloc_bulk(int cpt,unsigned bulk_npg,unsigned bulk_len,int sink)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_IOFS, 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
srpc_next_id(void)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
srpc_init_server_rpc(struct srpc_server_rpc * rpc,struct srpc_service_cd * scd,struct srpc_buffer * buffer)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
srpc_service_fini(struct srpc_service * svc)194 srpc_service_fini(struct srpc_service *svc)
195 {
196 struct srpc_service_cd *scd;
197 struct srpc_server_rpc *rpc;
198 struct srpc_buffer *buf;
199 struct list_head *q;
200 int i;
201
202 if (svc->sv_cpt_data == NULL)
203 return;
204
205 cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
206 while (1) {
207 if (!list_empty(&scd->scd_buf_posted))
208 q = &scd->scd_buf_posted;
209 else if (!list_empty(&scd->scd_buf_blocked))
210 q = &scd->scd_buf_blocked;
211 else
212 break;
213
214 while (!list_empty(q)) {
215 buf = list_entry(q->next,
216 struct srpc_buffer,
217 buf_list);
218 list_del(&buf->buf_list);
219 LIBCFS_FREE(buf, sizeof(*buf));
220 }
221 }
222
223 LASSERT(list_empty(&scd->scd_rpc_active));
224
225 while (!list_empty(&scd->scd_rpc_free)) {
226 rpc = list_entry(scd->scd_rpc_free.next,
227 struct srpc_server_rpc,
228 srpc_list);
229 list_del(&rpc->srpc_list);
230 LIBCFS_FREE(rpc, sizeof(*rpc));
231 }
232 }
233
234 cfs_percpt_free(svc->sv_cpt_data);
235 svc->sv_cpt_data = NULL;
236 }
237
238 static int
srpc_service_nrpcs(struct srpc_service * svc)239 srpc_service_nrpcs(struct srpc_service *svc)
240 {
241 int nrpcs = svc->sv_wi_total / svc->sv_ncpts;
242
243 return srpc_serv_is_framework(svc) ?
244 max(nrpcs, SFW_FRWK_WI_MIN) : max(nrpcs, SFW_TEST_WI_MIN);
245 }
246
247 int srpc_add_buffer(struct swi_workitem *wi);
248
249 static int
srpc_service_init(struct srpc_service * svc)250 srpc_service_init(struct srpc_service *svc)
251 {
252 struct srpc_service_cd *scd;
253 struct srpc_server_rpc *rpc;
254 int nrpcs;
255 int i;
256 int j;
257
258 svc->sv_shuttingdown = 0;
259
260 svc->sv_cpt_data = cfs_percpt_alloc(lnet_cpt_table(),
261 sizeof(struct srpc_service_cd));
262 if (svc->sv_cpt_data == NULL)
263 return -ENOMEM;
264
265 svc->sv_ncpts = srpc_serv_is_framework(svc) ?
266 1 : cfs_cpt_number(lnet_cpt_table());
267 nrpcs = srpc_service_nrpcs(svc);
268
269 cfs_percpt_for_each(scd, i, svc->sv_cpt_data) {
270 scd->scd_cpt = i;
271 scd->scd_svc = svc;
272 spin_lock_init(&scd->scd_lock);
273 INIT_LIST_HEAD(&scd->scd_rpc_free);
274 INIT_LIST_HEAD(&scd->scd_rpc_active);
275 INIT_LIST_HEAD(&scd->scd_buf_posted);
276 INIT_LIST_HEAD(&scd->scd_buf_blocked);
277
278 scd->scd_ev.ev_data = scd;
279 scd->scd_ev.ev_type = SRPC_REQUEST_RCVD;
280
281 /* NB: don't use lst_sched_serial for adding buffer,
282 * see details in srpc_service_add_buffers() */
283 swi_init_workitem(&scd->scd_buf_wi, scd,
284 srpc_add_buffer, lst_sched_test[i]);
285
286 if (i != 0 && srpc_serv_is_framework(svc)) {
287 /* NB: framework service only needs srpc_service_cd for
288 * one partition, but we allocate for all to make
289 * it easier to implement, it will waste a little
290 * memory but nobody should care about this */
291 continue;
292 }
293
294 for (j = 0; j < nrpcs; j++) {
295 LIBCFS_CPT_ALLOC(rpc, lnet_cpt_table(),
296 i, sizeof(*rpc));
297 if (rpc == NULL) {
298 srpc_service_fini(svc);
299 return -ENOMEM;
300 }
301 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
302 }
303 }
304
305 return 0;
306 }
307
308 int
srpc_add_service(struct srpc_service * sv)309 srpc_add_service(struct srpc_service *sv)
310 {
311 int id = sv->sv_id;
312
313 LASSERT(0 <= id && id <= SRPC_SERVICE_MAX_ID);
314
315 if (srpc_service_init(sv) != 0)
316 return -ENOMEM;
317
318 spin_lock(&srpc_data.rpc_glock);
319
320 LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
321
322 if (srpc_data.rpc_services[id] != NULL) {
323 spin_unlock(&srpc_data.rpc_glock);
324 goto failed;
325 }
326
327 srpc_data.rpc_services[id] = sv;
328 spin_unlock(&srpc_data.rpc_glock);
329
330 CDEBUG(D_NET, "Adding service: id %d, name %s\n", id, sv->sv_name);
331 return 0;
332
333 failed:
334 srpc_service_fini(sv);
335 return -EBUSY;
336 }
337
338 int
srpc_remove_service(srpc_service_t * sv)339 srpc_remove_service(srpc_service_t *sv)
340 {
341 int id = sv->sv_id;
342
343 spin_lock(&srpc_data.rpc_glock);
344
345 if (srpc_data.rpc_services[id] != sv) {
346 spin_unlock(&srpc_data.rpc_glock);
347 return -ENOENT;
348 }
349
350 srpc_data.rpc_services[id] = NULL;
351 spin_unlock(&srpc_data.rpc_glock);
352 return 0;
353 }
354
355 static int
srpc_post_passive_rdma(int portal,int local,__u64 matchbits,void * buf,int len,int options,lnet_process_id_t peer,lnet_handle_md_t * mdh,srpc_event_t * ev)356 srpc_post_passive_rdma(int portal, int local, __u64 matchbits, void *buf,
357 int len, int options, lnet_process_id_t peer,
358 lnet_handle_md_t *mdh, srpc_event_t *ev)
359 {
360 int rc;
361 lnet_md_t md;
362 lnet_handle_me_t meh;
363
364 rc = LNetMEAttach(portal, peer, matchbits, 0, LNET_UNLINK,
365 local ? LNET_INS_LOCAL : LNET_INS_AFTER, &meh);
366 if (rc != 0) {
367 CERROR("LNetMEAttach failed: %d\n", rc);
368 LASSERT(rc == -ENOMEM);
369 return -ENOMEM;
370 }
371
372 md.threshold = 1;
373 md.user_ptr = ev;
374 md.start = buf;
375 md.length = len;
376 md.options = options;
377 md.eq_handle = srpc_data.rpc_lnet_eq;
378
379 rc = LNetMDAttach(meh, md, LNET_UNLINK, mdh);
380 if (rc != 0) {
381 CERROR("LNetMDAttach failed: %d\n", rc);
382 LASSERT(rc == -ENOMEM);
383
384 rc = LNetMEUnlink(meh);
385 LASSERT(rc == 0);
386 return -ENOMEM;
387 }
388
389 CDEBUG(D_NET,
390 "Posted passive RDMA: peer %s, portal %d, matchbits %#llx\n",
391 libcfs_id2str(peer), portal, matchbits);
392 return 0;
393 }
394
395 static int
srpc_post_active_rdma(int portal,__u64 matchbits,void * buf,int len,int options,lnet_process_id_t peer,lnet_nid_t self,lnet_handle_md_t * mdh,srpc_event_t * ev)396 srpc_post_active_rdma(int portal, __u64 matchbits, void *buf, int len,
397 int options, lnet_process_id_t peer, lnet_nid_t self,
398 lnet_handle_md_t *mdh, srpc_event_t *ev)
399 {
400 int rc;
401 lnet_md_t md;
402
403 md.user_ptr = ev;
404 md.start = buf;
405 md.length = len;
406 md.eq_handle = srpc_data.rpc_lnet_eq;
407 md.threshold = ((options & LNET_MD_OP_GET) != 0) ? 2 : 1;
408 md.options = options & ~(LNET_MD_OP_PUT | LNET_MD_OP_GET);
409
410 rc = LNetMDBind(md, LNET_UNLINK, mdh);
411 if (rc != 0) {
412 CERROR("LNetMDBind failed: %d\n", rc);
413 LASSERT(rc == -ENOMEM);
414 return -ENOMEM;
415 }
416
417 /* this is kind of an abuse of the LNET_MD_OP_{PUT,GET} options.
418 * they're only meaningful for MDs attached to an ME (i.e. passive
419 * buffers... */
420 if ((options & LNET_MD_OP_PUT) != 0) {
421 rc = LNetPut(self, *mdh, LNET_NOACK_REQ, peer,
422 portal, matchbits, 0, 0);
423 } else {
424 LASSERT((options & LNET_MD_OP_GET) != 0);
425
426 rc = LNetGet(self, *mdh, peer, portal, matchbits, 0);
427 }
428
429 if (rc != 0) {
430 CERROR("LNet%s(%s, %d, %lld) failed: %d\n",
431 ((options & LNET_MD_OP_PUT) != 0) ? "Put" : "Get",
432 libcfs_id2str(peer), portal, matchbits, rc);
433
434 /* The forthcoming unlink event will complete this operation
435 * with failure, so fall through and return success here.
436 */
437 rc = LNetMDUnlink(*mdh);
438 LASSERT(rc == 0);
439 } else {
440 CDEBUG(D_NET,
441 "Posted active RDMA: peer %s, portal %u, matchbits %#llx\n",
442 libcfs_id2str(peer), portal, matchbits);
443 }
444 return 0;
445 }
446
447 static int
srpc_post_active_rqtbuf(lnet_process_id_t peer,int service,void * buf,int len,lnet_handle_md_t * mdh,srpc_event_t * ev)448 srpc_post_active_rqtbuf(lnet_process_id_t peer, int service, void *buf,
449 int len, lnet_handle_md_t *mdh, srpc_event_t *ev)
450 {
451 return srpc_post_active_rdma(srpc_serv_portal(service), service,
452 buf, len, LNET_MD_OP_PUT, peer,
453 LNET_NID_ANY, mdh, ev);
454 }
455
456 static int
srpc_post_passive_rqtbuf(int service,int local,void * buf,int len,lnet_handle_md_t * mdh,srpc_event_t * ev)457 srpc_post_passive_rqtbuf(int service, int local, void *buf, int len,
458 lnet_handle_md_t *mdh, srpc_event_t *ev)
459 {
460 lnet_process_id_t any = {0};
461
462 any.nid = LNET_NID_ANY;
463 any.pid = LNET_PID_ANY;
464
465 return srpc_post_passive_rdma(srpc_serv_portal(service),
466 local, service, buf, len,
467 LNET_MD_OP_PUT, any, mdh, ev);
468 }
469
470 static int
srpc_service_post_buffer(struct srpc_service_cd * scd,struct srpc_buffer * buf)471 srpc_service_post_buffer(struct srpc_service_cd *scd, struct srpc_buffer *buf)
472 __must_hold(&scd->scd_lock)
473 {
474 struct srpc_service *sv = scd->scd_svc;
475 struct srpc_msg *msg = &buf->buf_msg;
476 int rc;
477
478 LNetInvalidateHandle(&buf->buf_mdh);
479 list_add(&buf->buf_list, &scd->scd_buf_posted);
480 scd->scd_buf_nposted++;
481 spin_unlock(&scd->scd_lock);
482
483 rc = srpc_post_passive_rqtbuf(sv->sv_id,
484 !srpc_serv_is_framework(sv),
485 msg, sizeof(*msg), &buf->buf_mdh,
486 &scd->scd_ev);
487
488 /* At this point, a RPC (new or delayed) may have arrived in
489 * msg and its event handler has been called. So we must add
490 * buf to scd_buf_posted _before_ dropping scd_lock */
491
492 spin_lock(&scd->scd_lock);
493
494 if (rc == 0) {
495 if (!sv->sv_shuttingdown)
496 return 0;
497
498 spin_unlock(&scd->scd_lock);
499 /* srpc_shutdown_service might have tried to unlink me
500 * when my buf_mdh was still invalid */
501 LNetMDUnlink(buf->buf_mdh);
502 spin_lock(&scd->scd_lock);
503 return 0;
504 }
505
506 scd->scd_buf_nposted--;
507 if (sv->sv_shuttingdown)
508 return rc; /* don't allow to change scd_buf_posted */
509
510 list_del(&buf->buf_list);
511 spin_unlock(&scd->scd_lock);
512
513 LIBCFS_FREE(buf, sizeof(*buf));
514
515 spin_lock(&scd->scd_lock);
516 return rc;
517 }
518
519 int
srpc_add_buffer(struct swi_workitem * wi)520 srpc_add_buffer(struct swi_workitem *wi)
521 {
522 struct srpc_service_cd *scd = wi->swi_workitem.wi_data;
523 struct srpc_buffer *buf;
524 int rc = 0;
525
526 /* it's called by workitem scheduler threads, these threads
527 * should have been set CPT affinity, so buffers will be posted
528 * on CPT local list of Portal */
529 spin_lock(&scd->scd_lock);
530
531 while (scd->scd_buf_adjust > 0 &&
532 !scd->scd_svc->sv_shuttingdown) {
533 scd->scd_buf_adjust--; /* consume it */
534 scd->scd_buf_posting++;
535
536 spin_unlock(&scd->scd_lock);
537
538 LIBCFS_ALLOC(buf, sizeof(*buf));
539 if (buf == NULL) {
540 CERROR("Failed to add new buf to service: %s\n",
541 scd->scd_svc->sv_name);
542 spin_lock(&scd->scd_lock);
543 rc = -ENOMEM;
544 break;
545 }
546
547 spin_lock(&scd->scd_lock);
548 if (scd->scd_svc->sv_shuttingdown) {
549 spin_unlock(&scd->scd_lock);
550 LIBCFS_FREE(buf, sizeof(*buf));
551
552 spin_lock(&scd->scd_lock);
553 rc = -ESHUTDOWN;
554 break;
555 }
556
557 rc = srpc_service_post_buffer(scd, buf);
558 if (rc != 0)
559 break; /* buf has been freed inside */
560
561 LASSERT(scd->scd_buf_posting > 0);
562 scd->scd_buf_posting--;
563 scd->scd_buf_total++;
564 scd->scd_buf_low = max(2, scd->scd_buf_total / 4);
565 }
566
567 if (rc != 0) {
568 scd->scd_buf_err_stamp = get_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
srpc_service_add_buffers(struct srpc_service * sv,int nbuffer)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
srpc_service_remove_buffers(struct srpc_service * sv,int nbuffer)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
srpc_finish_service(struct srpc_service * sv)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
srpc_service_recycle_buffer(struct srpc_service_cd * scd,srpc_buffer_t * buf)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
srpc_abort_service(struct srpc_service * sv)732 srpc_abort_service(struct srpc_service *sv)
733 {
734 struct srpc_service_cd *scd;
735 struct srpc_server_rpc *rpc;
736 int i;
737
738 CDEBUG(D_NET, "Aborting service: id %d, name %s\n",
739 sv->sv_id, sv->sv_name);
740
741 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
742 spin_lock(&scd->scd_lock);
743
744 /* schedule in-flight RPCs to notice the abort, NB:
745 * racing with incoming RPCs; complete fix should make test
746 * RPCs carry session ID in its headers */
747 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list) {
748 rpc->srpc_aborted = 1;
749 swi_schedule_workitem(&rpc->srpc_wi);
750 }
751
752 spin_unlock(&scd->scd_lock);
753 }
754 }
755
756 void
srpc_shutdown_service(srpc_service_t * sv)757 srpc_shutdown_service(srpc_service_t *sv)
758 {
759 struct srpc_service_cd *scd;
760 struct srpc_server_rpc *rpc;
761 srpc_buffer_t *buf;
762 int i;
763
764 CDEBUG(D_NET, "Shutting down service: id %d, name %s\n",
765 sv->sv_id, sv->sv_name);
766
767 cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
768 spin_lock(&scd->scd_lock);
769
770 sv->sv_shuttingdown = 1; /* i.e. no new active RPC */
771
772 cfs_percpt_for_each(scd, i, sv->sv_cpt_data)
773 spin_unlock(&scd->scd_lock);
774
775 cfs_percpt_for_each(scd, i, sv->sv_cpt_data) {
776 spin_lock(&scd->scd_lock);
777
778 /* schedule in-flight RPCs to notice the shutdown */
779 list_for_each_entry(rpc, &scd->scd_rpc_active, srpc_list)
780 swi_schedule_workitem(&rpc->srpc_wi);
781
782 spin_unlock(&scd->scd_lock);
783
784 /* OK to traverse scd_buf_posted without lock, since no one
785 * touches scd_buf_posted now */
786 list_for_each_entry(buf, &scd->scd_buf_posted, buf_list)
787 LNetMDUnlink(buf->buf_mdh);
788 }
789 }
790
791 static int
srpc_send_request(srpc_client_rpc_t * rpc)792 srpc_send_request(srpc_client_rpc_t *rpc)
793 {
794 srpc_event_t *ev = &rpc->crpc_reqstev;
795 int rc;
796
797 ev->ev_fired = 0;
798 ev->ev_data = rpc;
799 ev->ev_type = SRPC_REQUEST_SENT;
800
801 rc = srpc_post_active_rqtbuf(rpc->crpc_dest, rpc->crpc_service,
802 &rpc->crpc_reqstmsg, sizeof(srpc_msg_t),
803 &rpc->crpc_reqstmdh, ev);
804 if (rc != 0) {
805 LASSERT(rc == -ENOMEM);
806 ev->ev_fired = 1; /* no more event expected */
807 }
808 return rc;
809 }
810
811 static int
srpc_prepare_reply(srpc_client_rpc_t * rpc)812 srpc_prepare_reply(srpc_client_rpc_t *rpc)
813 {
814 srpc_event_t *ev = &rpc->crpc_replyev;
815 __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.rpyid;
816 int rc;
817
818 ev->ev_fired = 0;
819 ev->ev_data = rpc;
820 ev->ev_type = SRPC_REPLY_RCVD;
821
822 *id = srpc_next_id();
823
824 rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
825 &rpc->crpc_replymsg, sizeof(srpc_msg_t),
826 LNET_MD_OP_PUT, rpc->crpc_dest,
827 &rpc->crpc_replymdh, ev);
828 if (rc != 0) {
829 LASSERT(rc == -ENOMEM);
830 ev->ev_fired = 1; /* no more event expected */
831 }
832 return rc;
833 }
834
835 static int
srpc_prepare_bulk(srpc_client_rpc_t * rpc)836 srpc_prepare_bulk(srpc_client_rpc_t *rpc)
837 {
838 srpc_bulk_t *bk = &rpc->crpc_bulk;
839 srpc_event_t *ev = &rpc->crpc_bulkev;
840 __u64 *id = &rpc->crpc_reqstmsg.msg_body.reqst.bulkid;
841 int rc;
842 int opt;
843
844 LASSERT(bk->bk_niov <= LNET_MAX_IOV);
845
846 if (bk->bk_niov == 0)
847 return 0; /* nothing to do */
848
849 opt = bk->bk_sink ? LNET_MD_OP_PUT : LNET_MD_OP_GET;
850 opt |= LNET_MD_KIOV;
851
852 ev->ev_fired = 0;
853 ev->ev_data = rpc;
854 ev->ev_type = SRPC_BULK_REQ_RCVD;
855
856 *id = srpc_next_id();
857
858 rc = srpc_post_passive_rdma(SRPC_RDMA_PORTAL, 0, *id,
859 &bk->bk_iovs[0], bk->bk_niov, opt,
860 rpc->crpc_dest, &bk->bk_mdh, ev);
861 if (rc != 0) {
862 LASSERT(rc == -ENOMEM);
863 ev->ev_fired = 1; /* no more event expected */
864 }
865 return rc;
866 }
867
868 static int
srpc_do_bulk(srpc_server_rpc_t * rpc)869 srpc_do_bulk(srpc_server_rpc_t *rpc)
870 {
871 srpc_event_t *ev = &rpc->srpc_ev;
872 srpc_bulk_t *bk = rpc->srpc_bulk;
873 __u64 id = rpc->srpc_reqstbuf->buf_msg.msg_body.reqst.bulkid;
874 int rc;
875 int opt;
876
877 LASSERT(bk != NULL);
878
879 opt = bk->bk_sink ? LNET_MD_OP_GET : LNET_MD_OP_PUT;
880 opt |= LNET_MD_KIOV;
881
882 ev->ev_fired = 0;
883 ev->ev_data = rpc;
884 ev->ev_type = bk->bk_sink ? SRPC_BULK_GET_RPLD : SRPC_BULK_PUT_SENT;
885
886 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, id,
887 &bk->bk_iovs[0], bk->bk_niov, opt,
888 rpc->srpc_peer, rpc->srpc_self,
889 &bk->bk_mdh, ev);
890 if (rc != 0)
891 ev->ev_fired = 1; /* no more event expected */
892 return rc;
893 }
894
895 /* only called from srpc_handle_rpc */
896 static void
srpc_server_rpc_done(srpc_server_rpc_t * rpc,int status)897 srpc_server_rpc_done(srpc_server_rpc_t *rpc, int status)
898 {
899 struct srpc_service_cd *scd = rpc->srpc_scd;
900 struct srpc_service *sv = scd->scd_svc;
901 srpc_buffer_t *buffer;
902
903 LASSERT(status != 0 || rpc->srpc_wi.swi_state == SWI_STATE_DONE);
904
905 rpc->srpc_status = status;
906
907 CDEBUG_LIMIT(status == 0 ? D_NET : D_NETERROR,
908 "Server RPC %p done: service %s, peer %s, status %s:%d\n",
909 rpc, sv->sv_name, libcfs_id2str(rpc->srpc_peer),
910 swi_state2str(rpc->srpc_wi.swi_state), status);
911
912 if (status != 0) {
913 spin_lock(&srpc_data.rpc_glock);
914 srpc_data.rpc_counters.rpcs_dropped++;
915 spin_unlock(&srpc_data.rpc_glock);
916 }
917
918 if (rpc->srpc_done != NULL)
919 (*rpc->srpc_done) (rpc);
920 LASSERT(rpc->srpc_bulk == NULL);
921
922 spin_lock(&scd->scd_lock);
923
924 if (rpc->srpc_reqstbuf != NULL) {
925 /* NB might drop sv_lock in srpc_service_recycle_buffer, but
926 * sv won't go away for scd_rpc_active must not be empty */
927 srpc_service_recycle_buffer(scd, rpc->srpc_reqstbuf);
928 rpc->srpc_reqstbuf = NULL;
929 }
930
931 list_del(&rpc->srpc_list); /* from scd->scd_rpc_active */
932
933 /*
934 * No one can schedule me now since:
935 * - I'm not on scd_rpc_active.
936 * - all LNet events have been fired.
937 * Cancel pending schedules and prevent future schedule attempts:
938 */
939 LASSERT(rpc->srpc_ev.ev_fired);
940 swi_exit_workitem(&rpc->srpc_wi);
941
942 if (!sv->sv_shuttingdown && !list_empty(&scd->scd_buf_blocked)) {
943 buffer = list_entry(scd->scd_buf_blocked.next,
944 srpc_buffer_t, buf_list);
945 list_del(&buffer->buf_list);
946
947 srpc_init_server_rpc(rpc, scd, buffer);
948 list_add_tail(&rpc->srpc_list, &scd->scd_rpc_active);
949 swi_schedule_workitem(&rpc->srpc_wi);
950 } else {
951 list_add(&rpc->srpc_list, &scd->scd_rpc_free);
952 }
953
954 spin_unlock(&scd->scd_lock);
955 return;
956 }
957
958 /* handles an incoming RPC */
959 int
srpc_handle_rpc(swi_workitem_t * wi)960 srpc_handle_rpc(swi_workitem_t *wi)
961 {
962 struct srpc_server_rpc *rpc = wi->swi_workitem.wi_data;
963 struct srpc_service_cd *scd = rpc->srpc_scd;
964 struct srpc_service *sv = scd->scd_svc;
965 srpc_event_t *ev = &rpc->srpc_ev;
966 int rc = 0;
967
968 LASSERT(wi == &rpc->srpc_wi);
969
970 spin_lock(&scd->scd_lock);
971
972 if (sv->sv_shuttingdown || rpc->srpc_aborted) {
973 spin_unlock(&scd->scd_lock);
974
975 if (rpc->srpc_bulk != NULL)
976 LNetMDUnlink(rpc->srpc_bulk->bk_mdh);
977 LNetMDUnlink(rpc->srpc_replymdh);
978
979 if (ev->ev_fired) { /* no more event, OK to finish */
980 srpc_server_rpc_done(rpc, -ESHUTDOWN);
981 return 1;
982 }
983 return 0;
984 }
985
986 spin_unlock(&scd->scd_lock);
987
988 switch (wi->swi_state) {
989 default:
990 LBUG();
991 case SWI_STATE_NEWBORN: {
992 srpc_msg_t *msg;
993 srpc_generic_reply_t *reply;
994
995 msg = &rpc->srpc_reqstbuf->buf_msg;
996 reply = &rpc->srpc_replymsg.msg_body.reply;
997
998 if (msg->msg_magic == 0) {
999 /* moaned already in srpc_lnet_ev_handler */
1000 srpc_server_rpc_done(rpc, EBADMSG);
1001 return 1;
1002 }
1003
1004 srpc_unpack_msg_hdr(msg);
1005 if (msg->msg_version != SRPC_MSG_VERSION) {
1006 CWARN("Version mismatch: %u, %u expected, from %s\n",
1007 msg->msg_version, SRPC_MSG_VERSION,
1008 libcfs_id2str(rpc->srpc_peer));
1009 reply->status = EPROTO;
1010 /* drop through and send reply */
1011 } else {
1012 reply->status = 0;
1013 rc = (*sv->sv_handler)(rpc);
1014 LASSERT(reply->status == 0 || !rpc->srpc_bulk);
1015 if (rc != 0) {
1016 srpc_server_rpc_done(rpc, rc);
1017 return 1;
1018 }
1019 }
1020
1021 wi->swi_state = SWI_STATE_BULK_STARTED;
1022
1023 if (rpc->srpc_bulk != NULL) {
1024 rc = srpc_do_bulk(rpc);
1025 if (rc == 0)
1026 return 0; /* wait for bulk */
1027
1028 LASSERT(ev->ev_fired);
1029 ev->ev_status = rc;
1030 }
1031 }
1032 case SWI_STATE_BULK_STARTED:
1033 LASSERT(rpc->srpc_bulk == NULL || ev->ev_fired);
1034
1035 if (rpc->srpc_bulk != NULL) {
1036 rc = ev->ev_status;
1037
1038 if (sv->sv_bulk_ready != NULL)
1039 rc = (*sv->sv_bulk_ready) (rpc, rc);
1040
1041 if (rc != 0) {
1042 srpc_server_rpc_done(rpc, rc);
1043 return 1;
1044 }
1045 }
1046
1047 wi->swi_state = SWI_STATE_REPLY_SUBMITTED;
1048 rc = srpc_send_reply(rpc);
1049 if (rc == 0)
1050 return 0; /* wait for reply */
1051 srpc_server_rpc_done(rpc, rc);
1052 return 1;
1053
1054 case SWI_STATE_REPLY_SUBMITTED:
1055 if (!ev->ev_fired) {
1056 CERROR("RPC %p: bulk %p, service %d\n",
1057 rpc, rpc->srpc_bulk, sv->sv_id);
1058 CERROR("Event: status %d, type %d, lnet %d\n",
1059 ev->ev_status, ev->ev_type, ev->ev_lnet);
1060 LASSERT(ev->ev_fired);
1061 }
1062
1063 wi->swi_state = SWI_STATE_DONE;
1064 srpc_server_rpc_done(rpc, ev->ev_status);
1065 return 1;
1066 }
1067
1068 return 0;
1069 }
1070
1071 static void
srpc_client_rpc_expired(void * data)1072 srpc_client_rpc_expired(void *data)
1073 {
1074 srpc_client_rpc_t *rpc = data;
1075
1076 CWARN("Client RPC expired: service %d, peer %s, timeout %d.\n",
1077 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1078 rpc->crpc_timeout);
1079
1080 spin_lock(&rpc->crpc_lock);
1081
1082 rpc->crpc_timeout = 0;
1083 srpc_abort_rpc(rpc, -ETIMEDOUT);
1084
1085 spin_unlock(&rpc->crpc_lock);
1086
1087 spin_lock(&srpc_data.rpc_glock);
1088 srpc_data.rpc_counters.rpcs_expired++;
1089 spin_unlock(&srpc_data.rpc_glock);
1090 }
1091
1092 inline void
srpc_add_client_rpc_timer(srpc_client_rpc_t * rpc)1093 srpc_add_client_rpc_timer(srpc_client_rpc_t *rpc)
1094 {
1095 stt_timer_t *timer = &rpc->crpc_timer;
1096
1097 if (rpc->crpc_timeout == 0)
1098 return;
1099
1100 INIT_LIST_HEAD(&timer->stt_list);
1101 timer->stt_data = rpc;
1102 timer->stt_func = srpc_client_rpc_expired;
1103 timer->stt_expires = cfs_time_add(rpc->crpc_timeout,
1104 get_seconds());
1105 stt_add_timer(timer);
1106 return;
1107 }
1108
1109 /*
1110 * Called with rpc->crpc_lock held.
1111 *
1112 * Upon exit the RPC expiry timer is not queued and the handler is not
1113 * running on any CPU. */
1114 static void
srpc_del_client_rpc_timer(srpc_client_rpc_t * rpc)1115 srpc_del_client_rpc_timer(srpc_client_rpc_t *rpc)
1116 {
1117 /* timer not planted or already exploded */
1118 if (rpc->crpc_timeout == 0)
1119 return;
1120
1121 /* timer successfully defused */
1122 if (stt_del_timer(&rpc->crpc_timer))
1123 return;
1124
1125 /* timer detonated, wait for it to explode */
1126 while (rpc->crpc_timeout != 0) {
1127 spin_unlock(&rpc->crpc_lock);
1128
1129 schedule();
1130
1131 spin_lock(&rpc->crpc_lock);
1132 }
1133 }
1134
1135 static void
srpc_client_rpc_done(srpc_client_rpc_t * rpc,int status)1136 srpc_client_rpc_done(srpc_client_rpc_t *rpc, int status)
1137 {
1138 swi_workitem_t *wi = &rpc->crpc_wi;
1139
1140 LASSERT(status != 0 || wi->swi_state == SWI_STATE_DONE);
1141
1142 spin_lock(&rpc->crpc_lock);
1143
1144 rpc->crpc_closed = 1;
1145 if (rpc->crpc_status == 0)
1146 rpc->crpc_status = status;
1147
1148 srpc_del_client_rpc_timer(rpc);
1149
1150 CDEBUG_LIMIT((status == 0) ? D_NET : D_NETERROR,
1151 "Client RPC done: service %d, peer %s, status %s:%d:%d\n",
1152 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1153 swi_state2str(wi->swi_state), rpc->crpc_aborted, status);
1154
1155 /*
1156 * No one can schedule me now since:
1157 * - RPC timer has been defused.
1158 * - all LNet events have been fired.
1159 * - crpc_closed has been set, preventing srpc_abort_rpc from
1160 * scheduling me.
1161 * Cancel pending schedules and prevent future schedule attempts:
1162 */
1163 LASSERT(!srpc_event_pending(rpc));
1164 swi_exit_workitem(wi);
1165
1166 spin_unlock(&rpc->crpc_lock);
1167
1168 (*rpc->crpc_done)(rpc);
1169 return;
1170 }
1171
1172 /* sends an outgoing RPC */
1173 int
srpc_send_rpc(swi_workitem_t * wi)1174 srpc_send_rpc(swi_workitem_t *wi)
1175 {
1176 int rc = 0;
1177 srpc_client_rpc_t *rpc;
1178 srpc_msg_t *reply;
1179 int do_bulk;
1180
1181 LASSERT(wi != NULL);
1182
1183 rpc = wi->swi_workitem.wi_data;
1184
1185 LASSERT(rpc != NULL);
1186 LASSERT(wi == &rpc->crpc_wi);
1187
1188 reply = &rpc->crpc_replymsg;
1189 do_bulk = rpc->crpc_bulk.bk_niov > 0;
1190
1191 spin_lock(&rpc->crpc_lock);
1192
1193 if (rpc->crpc_aborted) {
1194 spin_unlock(&rpc->crpc_lock);
1195 goto abort;
1196 }
1197
1198 spin_unlock(&rpc->crpc_lock);
1199
1200 switch (wi->swi_state) {
1201 default:
1202 LBUG();
1203 case SWI_STATE_NEWBORN:
1204 LASSERT(!srpc_event_pending(rpc));
1205
1206 rc = srpc_prepare_reply(rpc);
1207 if (rc != 0) {
1208 srpc_client_rpc_done(rpc, rc);
1209 return 1;
1210 }
1211
1212 rc = srpc_prepare_bulk(rpc);
1213 if (rc != 0)
1214 break;
1215
1216 wi->swi_state = SWI_STATE_REQUEST_SUBMITTED;
1217 rc = srpc_send_request(rpc);
1218 break;
1219
1220 case SWI_STATE_REQUEST_SUBMITTED:
1221 /* CAVEAT EMPTOR: rqtev, rpyev, and bulkev may come in any
1222 * order; however, they're processed in a strict order:
1223 * rqt, rpy, and bulk. */
1224 if (!rpc->crpc_reqstev.ev_fired)
1225 break;
1226
1227 rc = rpc->crpc_reqstev.ev_status;
1228 if (rc != 0)
1229 break;
1230
1231 wi->swi_state = SWI_STATE_REQUEST_SENT;
1232 /* perhaps more events, fall thru */
1233 case SWI_STATE_REQUEST_SENT: {
1234 srpc_msg_type_t type = srpc_service2reply(rpc->crpc_service);
1235
1236 if (!rpc->crpc_replyev.ev_fired)
1237 break;
1238
1239 rc = rpc->crpc_replyev.ev_status;
1240 if (rc != 0)
1241 break;
1242
1243 srpc_unpack_msg_hdr(reply);
1244 if (reply->msg_type != type ||
1245 (reply->msg_magic != SRPC_MSG_MAGIC &&
1246 reply->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1247 CWARN("Bad message from %s: type %u (%d expected), magic %u (%d expected).\n",
1248 libcfs_id2str(rpc->crpc_dest),
1249 reply->msg_type, type,
1250 reply->msg_magic, SRPC_MSG_MAGIC);
1251 rc = -EBADMSG;
1252 break;
1253 }
1254
1255 if (do_bulk && reply->msg_body.reply.status != 0) {
1256 CWARN("Remote error %d at %s, unlink bulk buffer in case peer didn't initiate bulk transfer\n",
1257 reply->msg_body.reply.status,
1258 libcfs_id2str(rpc->crpc_dest));
1259 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1260 }
1261
1262 wi->swi_state = SWI_STATE_REPLY_RECEIVED;
1263 }
1264 case SWI_STATE_REPLY_RECEIVED:
1265 if (do_bulk && !rpc->crpc_bulkev.ev_fired)
1266 break;
1267
1268 rc = do_bulk ? rpc->crpc_bulkev.ev_status : 0;
1269
1270 /* Bulk buffer was unlinked due to remote error. Clear error
1271 * since reply buffer still contains valid data.
1272 * NB rpc->crpc_done shouldn't look into bulk data in case of
1273 * remote error. */
1274 if (do_bulk && rpc->crpc_bulkev.ev_lnet == LNET_EVENT_UNLINK &&
1275 rpc->crpc_status == 0 && reply->msg_body.reply.status != 0)
1276 rc = 0;
1277
1278 wi->swi_state = SWI_STATE_DONE;
1279 srpc_client_rpc_done(rpc, rc);
1280 return 1;
1281 }
1282
1283 if (rc != 0) {
1284 spin_lock(&rpc->crpc_lock);
1285 srpc_abort_rpc(rpc, rc);
1286 spin_unlock(&rpc->crpc_lock);
1287 }
1288
1289 abort:
1290 if (rpc->crpc_aborted) {
1291 LNetMDUnlink(rpc->crpc_reqstmdh);
1292 LNetMDUnlink(rpc->crpc_replymdh);
1293 LNetMDUnlink(rpc->crpc_bulk.bk_mdh);
1294
1295 if (!srpc_event_pending(rpc)) {
1296 srpc_client_rpc_done(rpc, -EINTR);
1297 return 1;
1298 }
1299 }
1300 return 0;
1301 }
1302
1303 srpc_client_rpc_t *
srpc_create_client_rpc(lnet_process_id_t peer,int service,int nbulkiov,int bulklen,void (* rpc_done)(srpc_client_rpc_t *),void (* rpc_fini)(srpc_client_rpc_t *),void * priv)1304 srpc_create_client_rpc(lnet_process_id_t peer, int service,
1305 int nbulkiov, int bulklen,
1306 void (*rpc_done)(srpc_client_rpc_t *),
1307 void (*rpc_fini)(srpc_client_rpc_t *), void *priv)
1308 {
1309 srpc_client_rpc_t *rpc;
1310
1311 LIBCFS_ALLOC(rpc, offsetof(srpc_client_rpc_t,
1312 crpc_bulk.bk_iovs[nbulkiov]));
1313 if (rpc == NULL)
1314 return NULL;
1315
1316 srpc_init_client_rpc(rpc, peer, service, nbulkiov,
1317 bulklen, rpc_done, rpc_fini, priv);
1318 return rpc;
1319 }
1320
1321 /* called with rpc->crpc_lock held */
1322 void
srpc_abort_rpc(srpc_client_rpc_t * rpc,int why)1323 srpc_abort_rpc(srpc_client_rpc_t *rpc, int why)
1324 {
1325 LASSERT(why != 0);
1326
1327 if (rpc->crpc_aborted || /* already aborted */
1328 rpc->crpc_closed) /* callback imminent */
1329 return;
1330
1331 CDEBUG(D_NET,
1332 "Aborting RPC: service %d, peer %s, state %s, why %d\n",
1333 rpc->crpc_service, libcfs_id2str(rpc->crpc_dest),
1334 swi_state2str(rpc->crpc_wi.swi_state), why);
1335
1336 rpc->crpc_aborted = 1;
1337 rpc->crpc_status = why;
1338 swi_schedule_workitem(&rpc->crpc_wi);
1339 return;
1340 }
1341
1342 /* called with rpc->crpc_lock held */
1343 void
srpc_post_rpc(srpc_client_rpc_t * rpc)1344 srpc_post_rpc(srpc_client_rpc_t *rpc)
1345 {
1346 LASSERT(!rpc->crpc_aborted);
1347 LASSERT(srpc_data.rpc_state == SRPC_STATE_RUNNING);
1348
1349 CDEBUG(D_NET, "Posting RPC: peer %s, service %d, timeout %d\n",
1350 libcfs_id2str(rpc->crpc_dest), rpc->crpc_service,
1351 rpc->crpc_timeout);
1352
1353 srpc_add_client_rpc_timer(rpc);
1354 swi_schedule_workitem(&rpc->crpc_wi);
1355 return;
1356 }
1357
1358
1359 int
srpc_send_reply(struct srpc_server_rpc * rpc)1360 srpc_send_reply(struct srpc_server_rpc *rpc)
1361 {
1362 srpc_event_t *ev = &rpc->srpc_ev;
1363 struct srpc_msg *msg = &rpc->srpc_replymsg;
1364 struct srpc_buffer *buffer = rpc->srpc_reqstbuf;
1365 struct srpc_service_cd *scd = rpc->srpc_scd;
1366 struct srpc_service *sv = scd->scd_svc;
1367 __u64 rpyid;
1368 int rc;
1369
1370 LASSERT(buffer != NULL);
1371 rpyid = buffer->buf_msg.msg_body.reqst.rpyid;
1372
1373 spin_lock(&scd->scd_lock);
1374
1375 if (!sv->sv_shuttingdown && !srpc_serv_is_framework(sv)) {
1376 /* Repost buffer before replying since test client
1377 * might send me another RPC once it gets the reply */
1378 if (srpc_service_post_buffer(scd, buffer) != 0)
1379 CWARN("Failed to repost %s buffer\n", sv->sv_name);
1380 rpc->srpc_reqstbuf = NULL;
1381 }
1382
1383 spin_unlock(&scd->scd_lock);
1384
1385 ev->ev_fired = 0;
1386 ev->ev_data = rpc;
1387 ev->ev_type = SRPC_REPLY_SENT;
1388
1389 msg->msg_magic = SRPC_MSG_MAGIC;
1390 msg->msg_version = SRPC_MSG_VERSION;
1391 msg->msg_type = srpc_service2reply(sv->sv_id);
1392
1393 rc = srpc_post_active_rdma(SRPC_RDMA_PORTAL, rpyid, msg,
1394 sizeof(*msg), LNET_MD_OP_PUT,
1395 rpc->srpc_peer, rpc->srpc_self,
1396 &rpc->srpc_replymdh, ev);
1397 if (rc != 0)
1398 ev->ev_fired = 1; /* no more event expected */
1399 return rc;
1400 }
1401
1402 /* when in kernel always called with LNET_LOCK() held, and in thread context */
1403 static void
srpc_lnet_ev_handler(lnet_event_t * ev)1404 srpc_lnet_ev_handler(lnet_event_t *ev)
1405 {
1406 struct srpc_service_cd *scd;
1407 srpc_event_t *rpcev = ev->md.user_ptr;
1408 srpc_client_rpc_t *crpc;
1409 srpc_server_rpc_t *srpc;
1410 srpc_buffer_t *buffer;
1411 srpc_service_t *sv;
1412 srpc_msg_t *msg;
1413 srpc_msg_type_t type;
1414
1415 LASSERT(!in_interrupt());
1416
1417 if (ev->status != 0) {
1418 spin_lock(&srpc_data.rpc_glock);
1419 srpc_data.rpc_counters.errors++;
1420 spin_unlock(&srpc_data.rpc_glock);
1421 }
1422
1423 rpcev->ev_lnet = ev->type;
1424
1425 switch (rpcev->ev_type) {
1426 default:
1427 CERROR("Unknown event: status %d, type %d, lnet %d\n",
1428 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1429 LBUG();
1430 case SRPC_REQUEST_SENT:
1431 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1432 spin_lock(&srpc_data.rpc_glock);
1433 srpc_data.rpc_counters.rpcs_sent++;
1434 spin_unlock(&srpc_data.rpc_glock);
1435 }
1436 case SRPC_REPLY_RCVD:
1437 case SRPC_BULK_REQ_RCVD:
1438 crpc = rpcev->ev_data;
1439
1440 if (rpcev != &crpc->crpc_reqstev &&
1441 rpcev != &crpc->crpc_replyev &&
1442 rpcev != &crpc->crpc_bulkev) {
1443 CERROR("rpcev %p, crpc %p, reqstev %p, replyev %p, bulkev %p\n",
1444 rpcev, crpc, &crpc->crpc_reqstev,
1445 &crpc->crpc_replyev, &crpc->crpc_bulkev);
1446 CERROR("Bad event: status %d, type %d, lnet %d\n",
1447 rpcev->ev_status, rpcev->ev_type, rpcev->ev_lnet);
1448 LBUG();
1449 }
1450
1451 spin_lock(&crpc->crpc_lock);
1452
1453 LASSERT(rpcev->ev_fired == 0);
1454 rpcev->ev_fired = 1;
1455 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1456 -EINTR : ev->status;
1457 swi_schedule_workitem(&crpc->crpc_wi);
1458
1459 spin_unlock(&crpc->crpc_lock);
1460 break;
1461
1462 case SRPC_REQUEST_RCVD:
1463 scd = rpcev->ev_data;
1464 sv = scd->scd_svc;
1465
1466 LASSERT(rpcev == &scd->scd_ev);
1467
1468 spin_lock(&scd->scd_lock);
1469
1470 LASSERT(ev->unlinked);
1471 LASSERT(ev->type == LNET_EVENT_PUT ||
1472 ev->type == LNET_EVENT_UNLINK);
1473 LASSERT(ev->type != LNET_EVENT_UNLINK ||
1474 sv->sv_shuttingdown);
1475
1476 buffer = container_of(ev->md.start, srpc_buffer_t, buf_msg);
1477 buffer->buf_peer = ev->initiator;
1478 buffer->buf_self = ev->target.nid;
1479
1480 LASSERT(scd->scd_buf_nposted > 0);
1481 scd->scd_buf_nposted--;
1482
1483 if (sv->sv_shuttingdown) {
1484 /* Leave buffer on scd->scd_buf_nposted since
1485 * srpc_finish_service needs to traverse it. */
1486 spin_unlock(&scd->scd_lock);
1487 break;
1488 }
1489
1490 if (scd->scd_buf_err_stamp != 0 &&
1491 scd->scd_buf_err_stamp < get_seconds()) {
1492 /* re-enable adding buffer */
1493 scd->scd_buf_err_stamp = 0;
1494 scd->scd_buf_err = 0;
1495 }
1496
1497 if (scd->scd_buf_err == 0 && /* adding buffer is enabled */
1498 scd->scd_buf_adjust == 0 &&
1499 scd->scd_buf_nposted < scd->scd_buf_low) {
1500 scd->scd_buf_adjust = max(scd->scd_buf_total / 2,
1501 SFW_TEST_WI_MIN);
1502 swi_schedule_workitem(&scd->scd_buf_wi);
1503 }
1504
1505 list_del(&buffer->buf_list); /* from scd->scd_buf_posted */
1506 msg = &buffer->buf_msg;
1507 type = srpc_service2request(sv->sv_id);
1508
1509 if (ev->status != 0 || ev->mlength != sizeof(*msg) ||
1510 (msg->msg_type != type &&
1511 msg->msg_type != __swab32(type)) ||
1512 (msg->msg_magic != SRPC_MSG_MAGIC &&
1513 msg->msg_magic != __swab32(SRPC_MSG_MAGIC))) {
1514 CERROR("Dropping RPC (%s) from %s: status %d mlength %d type %u magic %u.\n",
1515 sv->sv_name, libcfs_id2str(ev->initiator),
1516 ev->status, ev->mlength,
1517 msg->msg_type, msg->msg_magic);
1518
1519 /* NB can't call srpc_service_recycle_buffer here since
1520 * it may call LNetM[DE]Attach. The invalid magic tells
1521 * srpc_handle_rpc to drop this RPC */
1522 msg->msg_magic = 0;
1523 }
1524
1525 if (!list_empty(&scd->scd_rpc_free)) {
1526 srpc = list_entry(scd->scd_rpc_free.next,
1527 struct srpc_server_rpc,
1528 srpc_list);
1529 list_del(&srpc->srpc_list);
1530
1531 srpc_init_server_rpc(srpc, scd, buffer);
1532 list_add_tail(&srpc->srpc_list,
1533 &scd->scd_rpc_active);
1534 swi_schedule_workitem(&srpc->srpc_wi);
1535 } else {
1536 list_add_tail(&buffer->buf_list,
1537 &scd->scd_buf_blocked);
1538 }
1539
1540 spin_unlock(&scd->scd_lock);
1541
1542 spin_lock(&srpc_data.rpc_glock);
1543 srpc_data.rpc_counters.rpcs_rcvd++;
1544 spin_unlock(&srpc_data.rpc_glock);
1545 break;
1546
1547 case SRPC_BULK_GET_RPLD:
1548 LASSERT(ev->type == LNET_EVENT_SEND ||
1549 ev->type == LNET_EVENT_REPLY ||
1550 ev->type == LNET_EVENT_UNLINK);
1551
1552 if (!ev->unlinked)
1553 break; /* wait for final event */
1554
1555 case SRPC_BULK_PUT_SENT:
1556 if (ev->status == 0 && ev->type != LNET_EVENT_UNLINK) {
1557 spin_lock(&srpc_data.rpc_glock);
1558
1559 if (rpcev->ev_type == SRPC_BULK_GET_RPLD)
1560 srpc_data.rpc_counters.bulk_get += ev->mlength;
1561 else
1562 srpc_data.rpc_counters.bulk_put += ev->mlength;
1563
1564 spin_unlock(&srpc_data.rpc_glock);
1565 }
1566 case SRPC_REPLY_SENT:
1567 srpc = rpcev->ev_data;
1568 scd = srpc->srpc_scd;
1569
1570 LASSERT(rpcev == &srpc->srpc_ev);
1571
1572 spin_lock(&scd->scd_lock);
1573
1574 rpcev->ev_fired = 1;
1575 rpcev->ev_status = (ev->type == LNET_EVENT_UNLINK) ?
1576 -EINTR : ev->status;
1577 swi_schedule_workitem(&srpc->srpc_wi);
1578
1579 spin_unlock(&scd->scd_lock);
1580 break;
1581 }
1582 }
1583
1584
1585 int
srpc_startup(void)1586 srpc_startup(void)
1587 {
1588 int rc;
1589
1590 memset(&srpc_data, 0, sizeof(struct smoketest_rpc));
1591 spin_lock_init(&srpc_data.rpc_glock);
1592
1593 /* 1 second pause to avoid timestamp reuse */
1594 set_current_state(TASK_UNINTERRUPTIBLE);
1595 schedule_timeout(cfs_time_seconds(1));
1596 srpc_data.rpc_matchbits = ((__u64) get_seconds()) << 48;
1597
1598 srpc_data.rpc_state = SRPC_STATE_NONE;
1599
1600 rc = LNetNIInit(LUSTRE_SRV_LNET_PID);
1601 if (rc < 0) {
1602 CERROR("LNetNIInit() has failed: %d\n", rc);
1603 return rc;
1604 }
1605
1606 srpc_data.rpc_state = SRPC_STATE_NI_INIT;
1607
1608 LNetInvalidateHandle(&srpc_data.rpc_lnet_eq);
1609 rc = LNetEQAlloc(0, srpc_lnet_ev_handler, &srpc_data.rpc_lnet_eq);
1610 if (rc != 0) {
1611 CERROR("LNetEQAlloc() has failed: %d\n", rc);
1612 goto bail;
1613 }
1614
1615 rc = LNetSetLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1616 LASSERT(rc == 0);
1617 rc = LNetSetLazyPortal(SRPC_REQUEST_PORTAL);
1618 LASSERT(rc == 0);
1619
1620 srpc_data.rpc_state = SRPC_STATE_EQ_INIT;
1621
1622 rc = stt_startup();
1623
1624 bail:
1625 if (rc != 0)
1626 srpc_shutdown();
1627 else
1628 srpc_data.rpc_state = SRPC_STATE_RUNNING;
1629
1630 return rc;
1631 }
1632
1633 void
srpc_shutdown(void)1634 srpc_shutdown(void)
1635 {
1636 int i;
1637 int rc;
1638 int state;
1639
1640 state = srpc_data.rpc_state;
1641 srpc_data.rpc_state = SRPC_STATE_STOPPING;
1642
1643 switch (state) {
1644 default:
1645 LBUG();
1646 case SRPC_STATE_RUNNING:
1647 spin_lock(&srpc_data.rpc_glock);
1648
1649 for (i = 0; i <= SRPC_SERVICE_MAX_ID; i++) {
1650 srpc_service_t *sv = srpc_data.rpc_services[i];
1651
1652 LASSERTF(sv == NULL,
1653 "service not empty: id %d, name %s\n",
1654 i, sv->sv_name);
1655 }
1656
1657 spin_unlock(&srpc_data.rpc_glock);
1658
1659 stt_shutdown();
1660
1661 case SRPC_STATE_EQ_INIT:
1662 rc = LNetClearLazyPortal(SRPC_FRAMEWORK_REQUEST_PORTAL);
1663 rc = LNetClearLazyPortal(SRPC_REQUEST_PORTAL);
1664 LASSERT(rc == 0);
1665 rc = LNetEQFree(srpc_data.rpc_lnet_eq);
1666 LASSERT(rc == 0); /* the EQ should have no user by now */
1667
1668 case SRPC_STATE_NI_INIT:
1669 LNetNIFini();
1670 }
1671
1672 return;
1673 }
1674