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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / drivers / staging / lustre / lnet / klnds / o2iblnd / o2iblnd.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) 2011, 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/klnds/o2iblnd/o2iblnd.c
37 *
38 * Author: Eric Barton <eric@bartonsoftware.com>
39 */
40
41 #include <asm/div64.h>
42 #include <asm/page.h>
43 #include "o2iblnd.h"
44
45 static lnd_t the_o2iblnd = {
46 .lnd_type = O2IBLND,
47 .lnd_startup = kiblnd_startup,
48 .lnd_shutdown = kiblnd_shutdown,
49 .lnd_ctl = kiblnd_ctl,
50 .lnd_query = kiblnd_query,
51 .lnd_send = kiblnd_send,
52 .lnd_recv = kiblnd_recv,
53 };
54
55 kib_data_t kiblnd_data;
56
57 static __u32 kiblnd_cksum(void *ptr, int nob)
58 {
59 char *c = ptr;
60 __u32 sum = 0;
61
62 while (nob-- > 0)
63 sum = ((sum << 1) | (sum >> 31)) + *c++;
64
65 /* ensure I don't return 0 (== no checksum) */
66 return (sum == 0) ? 1 : sum;
67 }
68
69 static char *kiblnd_msgtype2str(int type)
70 {
71 switch (type) {
72 case IBLND_MSG_CONNREQ:
73 return "CONNREQ";
74
75 case IBLND_MSG_CONNACK:
76 return "CONNACK";
77
78 case IBLND_MSG_NOOP:
79 return "NOOP";
80
81 case IBLND_MSG_IMMEDIATE:
82 return "IMMEDIATE";
83
84 case IBLND_MSG_PUT_REQ:
85 return "PUT_REQ";
86
87 case IBLND_MSG_PUT_NAK:
88 return "PUT_NAK";
89
90 case IBLND_MSG_PUT_ACK:
91 return "PUT_ACK";
92
93 case IBLND_MSG_PUT_DONE:
94 return "PUT_DONE";
95
96 case IBLND_MSG_GET_REQ:
97 return "GET_REQ";
98
99 case IBLND_MSG_GET_DONE:
100 return "GET_DONE";
101
102 default:
103 return "???";
104 }
105 }
106
107 static int kiblnd_msgtype2size(int type)
108 {
109 const int hdr_size = offsetof(kib_msg_t, ibm_u);
110
111 switch (type) {
112 case IBLND_MSG_CONNREQ:
113 case IBLND_MSG_CONNACK:
114 return hdr_size + sizeof(kib_connparams_t);
115
116 case IBLND_MSG_NOOP:
117 return hdr_size;
118
119 case IBLND_MSG_IMMEDIATE:
120 return offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[0]);
121
122 case IBLND_MSG_PUT_REQ:
123 return hdr_size + sizeof(kib_putreq_msg_t);
124
125 case IBLND_MSG_PUT_ACK:
126 return hdr_size + sizeof(kib_putack_msg_t);
127
128 case IBLND_MSG_GET_REQ:
129 return hdr_size + sizeof(kib_get_msg_t);
130
131 case IBLND_MSG_PUT_NAK:
132 case IBLND_MSG_PUT_DONE:
133 case IBLND_MSG_GET_DONE:
134 return hdr_size + sizeof(kib_completion_msg_t);
135 default:
136 return -1;
137 }
138 }
139
140 static int kiblnd_unpack_rd(kib_msg_t *msg, int flip)
141 {
142 kib_rdma_desc_t *rd;
143 int nob;
144 int n;
145 int i;
146
147 LASSERT(msg->ibm_type == IBLND_MSG_GET_REQ ||
148 msg->ibm_type == IBLND_MSG_PUT_ACK);
149
150 rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
151 &msg->ibm_u.get.ibgm_rd :
152 &msg->ibm_u.putack.ibpam_rd;
153
154 if (flip) {
155 __swab32s(&rd->rd_key);
156 __swab32s(&rd->rd_nfrags);
157 }
158
159 n = rd->rd_nfrags;
160
161 if (n <= 0 || n > IBLND_MAX_RDMA_FRAGS) {
162 CERROR("Bad nfrags: %d, should be 0 < n <= %d\n",
163 n, IBLND_MAX_RDMA_FRAGS);
164 return 1;
165 }
166
167 nob = offsetof(kib_msg_t, ibm_u) +
168 kiblnd_rd_msg_size(rd, msg->ibm_type, n);
169
170 if (msg->ibm_nob < nob) {
171 CERROR("Short %s: %d(%d)\n",
172 kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
173 return 1;
174 }
175
176 if (!flip)
177 return 0;
178
179 for (i = 0; i < n; i++) {
180 __swab32s(&rd->rd_frags[i].rf_nob);
181 __swab64s(&rd->rd_frags[i].rf_addr);
182 }
183
184 return 0;
185 }
186
187 void kiblnd_pack_msg(lnet_ni_t *ni, kib_msg_t *msg, int version,
188 int credits, lnet_nid_t dstnid, __u64 dststamp)
189 {
190 kib_net_t *net = ni->ni_data;
191
192 /* CAVEAT EMPTOR! all message fields not set here should have been
193 * initialised previously. */
194 msg->ibm_magic = IBLND_MSG_MAGIC;
195 msg->ibm_version = version;
196 /* ibm_type */
197 msg->ibm_credits = credits;
198 /* ibm_nob */
199 msg->ibm_cksum = 0;
200 msg->ibm_srcnid = ni->ni_nid;
201 msg->ibm_srcstamp = net->ibn_incarnation;
202 msg->ibm_dstnid = dstnid;
203 msg->ibm_dststamp = dststamp;
204
205 if (*kiblnd_tunables.kib_cksum) {
206 /* NB ibm_cksum zero while computing cksum */
207 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
208 }
209 }
210
211 int kiblnd_unpack_msg(kib_msg_t *msg, int nob)
212 {
213 const int hdr_size = offsetof(kib_msg_t, ibm_u);
214 __u32 msg_cksum;
215 __u16 version;
216 int msg_nob;
217 int flip;
218
219 /* 6 bytes are enough to have received magic + version */
220 if (nob < 6) {
221 CERROR("Short message: %d\n", nob);
222 return -EPROTO;
223 }
224
225 if (msg->ibm_magic == IBLND_MSG_MAGIC) {
226 flip = 0;
227 } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
228 flip = 1;
229 } else {
230 CERROR("Bad magic: %08x\n", msg->ibm_magic);
231 return -EPROTO;
232 }
233
234 version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
235 if (version != IBLND_MSG_VERSION &&
236 version != IBLND_MSG_VERSION_1) {
237 CERROR("Bad version: %x\n", version);
238 return -EPROTO;
239 }
240
241 if (nob < hdr_size) {
242 CERROR("Short message: %d\n", nob);
243 return -EPROTO;
244 }
245
246 msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
247 if (msg_nob > nob) {
248 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
249 return -EPROTO;
250 }
251
252 /* checksum must be computed with ibm_cksum zero and BEFORE anything
253 * gets flipped */
254 msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
255 msg->ibm_cksum = 0;
256 if (msg_cksum != 0 &&
257 msg_cksum != kiblnd_cksum(msg, msg_nob)) {
258 CERROR("Bad checksum\n");
259 return -EPROTO;
260 }
261
262 msg->ibm_cksum = msg_cksum;
263
264 if (flip) {
265 /* leave magic unflipped as a clue to peer endianness */
266 msg->ibm_version = version;
267 CLASSERT(sizeof(msg->ibm_type) == 1);
268 CLASSERT(sizeof(msg->ibm_credits) == 1);
269 msg->ibm_nob = msg_nob;
270 __swab64s(&msg->ibm_srcnid);
271 __swab64s(&msg->ibm_srcstamp);
272 __swab64s(&msg->ibm_dstnid);
273 __swab64s(&msg->ibm_dststamp);
274 }
275
276 if (msg->ibm_srcnid == LNET_NID_ANY) {
277 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
278 return -EPROTO;
279 }
280
281 if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
282 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
283 msg_nob, kiblnd_msgtype2size(msg->ibm_type));
284 return -EPROTO;
285 }
286
287 switch (msg->ibm_type) {
288 default:
289 CERROR("Unknown message type %x\n", msg->ibm_type);
290 return -EPROTO;
291
292 case IBLND_MSG_NOOP:
293 case IBLND_MSG_IMMEDIATE:
294 case IBLND_MSG_PUT_REQ:
295 break;
296
297 case IBLND_MSG_PUT_ACK:
298 case IBLND_MSG_GET_REQ:
299 if (kiblnd_unpack_rd(msg, flip))
300 return -EPROTO;
301 break;
302
303 case IBLND_MSG_PUT_NAK:
304 case IBLND_MSG_PUT_DONE:
305 case IBLND_MSG_GET_DONE:
306 if (flip)
307 __swab32s(&msg->ibm_u.completion.ibcm_status);
308 break;
309
310 case IBLND_MSG_CONNREQ:
311 case IBLND_MSG_CONNACK:
312 if (flip) {
313 __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
314 __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
315 __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
316 }
317 break;
318 }
319 return 0;
320 }
321
322 int kiblnd_create_peer(lnet_ni_t *ni, kib_peer_t **peerp, lnet_nid_t nid)
323 {
324 kib_peer_t *peer;
325 kib_net_t *net = ni->ni_data;
326 int cpt = lnet_cpt_of_nid(nid);
327 unsigned long flags;
328
329 LASSERT(net != NULL);
330 LASSERT(nid != LNET_NID_ANY);
331
332 LIBCFS_CPT_ALLOC(peer, lnet_cpt_table(), cpt, sizeof(*peer));
333 if (peer == NULL) {
334 CERROR("Cannot allocate peer\n");
335 return -ENOMEM;
336 }
337
338 memset(peer, 0, sizeof(*peer)); /* zero flags etc */
339
340 peer->ibp_ni = ni;
341 peer->ibp_nid = nid;
342 peer->ibp_error = 0;
343 peer->ibp_last_alive = 0;
344 atomic_set(&peer->ibp_refcount, 1); /* 1 ref for caller */
345
346 INIT_LIST_HEAD(&peer->ibp_list); /* not in the peer table yet */
347 INIT_LIST_HEAD(&peer->ibp_conns);
348 INIT_LIST_HEAD(&peer->ibp_tx_queue);
349
350 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
351
352 /* always called with a ref on ni, which prevents ni being shutdown */
353 LASSERT(net->ibn_shutdown == 0);
354
355 /* npeers only grows with the global lock held */
356 atomic_inc(&net->ibn_npeers);
357
358 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
359
360 *peerp = peer;
361 return 0;
362 }
363
364 void kiblnd_destroy_peer(kib_peer_t *peer)
365 {
366 kib_net_t *net = peer->ibp_ni->ni_data;
367
368 LASSERT(net != NULL);
369 LASSERT(atomic_read(&peer->ibp_refcount) == 0);
370 LASSERT(!kiblnd_peer_active(peer));
371 LASSERT(peer->ibp_connecting == 0);
372 LASSERT(peer->ibp_accepting == 0);
373 LASSERT(list_empty(&peer->ibp_conns));
374 LASSERT(list_empty(&peer->ibp_tx_queue));
375
376 LIBCFS_FREE(peer, sizeof(*peer));
377
378 /* NB a peer's connections keep a reference on their peer until
379 * they are destroyed, so we can be assured that _all_ state to do
380 * with this peer has been cleaned up when its refcount drops to
381 * zero. */
382 atomic_dec(&net->ibn_npeers);
383 }
384
385 kib_peer_t *kiblnd_find_peer_locked(lnet_nid_t nid)
386 {
387 /* the caller is responsible for accounting the additional reference
388 * that this creates */
389 struct list_head *peer_list = kiblnd_nid2peerlist(nid);
390 struct list_head *tmp;
391 kib_peer_t *peer;
392
393 list_for_each(tmp, peer_list) {
394
395 peer = list_entry(tmp, kib_peer_t, ibp_list);
396
397 LASSERT(peer->ibp_connecting > 0 || /* creating conns */
398 peer->ibp_accepting > 0 ||
399 !list_empty(&peer->ibp_conns)); /* active conn */
400
401 if (peer->ibp_nid != nid)
402 continue;
403
404 CDEBUG(D_NET, "got peer [%p] -> %s (%d) version: %x\n",
405 peer, libcfs_nid2str(nid),
406 atomic_read(&peer->ibp_refcount),
407 peer->ibp_version);
408 return peer;
409 }
410 return NULL;
411 }
412
413 void kiblnd_unlink_peer_locked(kib_peer_t *peer)
414 {
415 LASSERT(list_empty(&peer->ibp_conns));
416
417 LASSERT(kiblnd_peer_active(peer));
418 list_del_init(&peer->ibp_list);
419 /* lose peerlist's ref */
420 kiblnd_peer_decref(peer);
421 }
422
423 static int kiblnd_get_peer_info(lnet_ni_t *ni, int index,
424 lnet_nid_t *nidp, int *count)
425 {
426 kib_peer_t *peer;
427 struct list_head *ptmp;
428 int i;
429 unsigned long flags;
430
431 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
432
433 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
434
435 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
436
437 peer = list_entry(ptmp, kib_peer_t, ibp_list);
438 LASSERT(peer->ibp_connecting > 0 ||
439 peer->ibp_accepting > 0 ||
440 !list_empty(&peer->ibp_conns));
441
442 if (peer->ibp_ni != ni)
443 continue;
444
445 if (index-- > 0)
446 continue;
447
448 *nidp = peer->ibp_nid;
449 *count = atomic_read(&peer->ibp_refcount);
450
451 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
452 flags);
453 return 0;
454 }
455 }
456
457 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
458 return -ENOENT;
459 }
460
461 static void kiblnd_del_peer_locked(kib_peer_t *peer)
462 {
463 struct list_head *ctmp;
464 struct list_head *cnxt;
465 kib_conn_t *conn;
466
467 if (list_empty(&peer->ibp_conns)) {
468 kiblnd_unlink_peer_locked(peer);
469 } else {
470 list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
471 conn = list_entry(ctmp, kib_conn_t, ibc_list);
472
473 kiblnd_close_conn_locked(conn, 0);
474 }
475 /* NB closing peer's last conn unlinked it. */
476 }
477 /* NB peer now unlinked; might even be freed if the peer table had the
478 * last ref on it. */
479 }
480
481 static int kiblnd_del_peer(lnet_ni_t *ni, lnet_nid_t nid)
482 {
483 LIST_HEAD(zombies);
484 struct list_head *ptmp;
485 struct list_head *pnxt;
486 kib_peer_t *peer;
487 int lo;
488 int hi;
489 int i;
490 unsigned long flags;
491 int rc = -ENOENT;
492
493 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
494
495 if (nid != LNET_NID_ANY) {
496 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
497 } else {
498 lo = 0;
499 hi = kiblnd_data.kib_peer_hash_size - 1;
500 }
501
502 for (i = lo; i <= hi; i++) {
503 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
504 peer = list_entry(ptmp, kib_peer_t, ibp_list);
505 LASSERT(peer->ibp_connecting > 0 ||
506 peer->ibp_accepting > 0 ||
507 !list_empty(&peer->ibp_conns));
508
509 if (peer->ibp_ni != ni)
510 continue;
511
512 if (!(nid == LNET_NID_ANY || peer->ibp_nid == nid))
513 continue;
514
515 if (!list_empty(&peer->ibp_tx_queue)) {
516 LASSERT(list_empty(&peer->ibp_conns));
517
518 list_splice_init(&peer->ibp_tx_queue,
519 &zombies);
520 }
521
522 kiblnd_del_peer_locked(peer);
523 rc = 0; /* matched something */
524 }
525 }
526
527 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
528
529 kiblnd_txlist_done(ni, &zombies, -EIO);
530
531 return rc;
532 }
533
534 static kib_conn_t *kiblnd_get_conn_by_idx(lnet_ni_t *ni, int index)
535 {
536 kib_peer_t *peer;
537 struct list_head *ptmp;
538 kib_conn_t *conn;
539 struct list_head *ctmp;
540 int i;
541 unsigned long flags;
542
543 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
544
545 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++) {
546 list_for_each(ptmp, &kiblnd_data.kib_peers[i]) {
547
548 peer = list_entry(ptmp, kib_peer_t, ibp_list);
549 LASSERT(peer->ibp_connecting > 0 ||
550 peer->ibp_accepting > 0 ||
551 !list_empty(&peer->ibp_conns));
552
553 if (peer->ibp_ni != ni)
554 continue;
555
556 list_for_each(ctmp, &peer->ibp_conns) {
557 if (index-- > 0)
558 continue;
559
560 conn = list_entry(ctmp, kib_conn_t,
561 ibc_list);
562 kiblnd_conn_addref(conn);
563 read_unlock_irqrestore(
564 &kiblnd_data.kib_global_lock,
565 flags);
566 return conn;
567 }
568 }
569 }
570
571 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
572 return NULL;
573 }
574
575 int kiblnd_translate_mtu(int value)
576 {
577 switch (value) {
578 default:
579 return -1;
580 case 0:
581 return 0;
582 case 256:
583 return IB_MTU_256;
584 case 512:
585 return IB_MTU_512;
586 case 1024:
587 return IB_MTU_1024;
588 case 2048:
589 return IB_MTU_2048;
590 case 4096:
591 return IB_MTU_4096;
592 }
593 }
594
595 static void kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
596 {
597 int mtu;
598
599 /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
600 if (cmid->route.path_rec == NULL)
601 return;
602
603 mtu = kiblnd_translate_mtu(*kiblnd_tunables.kib_ib_mtu);
604 LASSERT(mtu >= 0);
605 if (mtu != 0)
606 cmid->route.path_rec->mtu = mtu;
607 }
608
609 static int kiblnd_get_completion_vector(kib_conn_t *conn, int cpt)
610 {
611 cpumask_t *mask;
612 int vectors;
613 int off;
614 int i;
615 lnet_nid_t nid = conn->ibc_peer->ibp_nid;
616
617 vectors = conn->ibc_cmid->device->num_comp_vectors;
618 if (vectors <= 1)
619 return 0;
620
621 mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
622 if (mask == NULL)
623 return 0;
624
625 /* hash NID to CPU id in this partition... */
626 off = do_div(nid, cpumask_weight(mask));
627 for_each_cpu(i, mask) {
628 if (off-- == 0)
629 return i % vectors;
630 }
631
632 LBUG();
633 return 1;
634 }
635
636 kib_conn_t *kiblnd_create_conn(kib_peer_t *peer, struct rdma_cm_id *cmid,
637 int state, int version)
638 {
639 /* CAVEAT EMPTOR:
640 * If the new conn is created successfully it takes over the caller's
641 * ref on 'peer'. It also "owns" 'cmid' and destroys it when it itself
642 * is destroyed. On failure, the caller's ref on 'peer' remains and
643 * she must dispose of 'cmid'. (Actually I'd block forever if I tried
644 * to destroy 'cmid' here since I'm called from the CM which still has
645 * its ref on 'cmid'). */
646 rwlock_t *glock = &kiblnd_data.kib_global_lock;
647 kib_net_t *net = peer->ibp_ni->ni_data;
648 kib_dev_t *dev;
649 struct ib_qp_init_attr *init_qp_attr;
650 struct kib_sched_info *sched;
651 struct ib_cq_init_attr cq_attr = {};
652 kib_conn_t *conn;
653 struct ib_cq *cq;
654 unsigned long flags;
655 int cpt;
656 int rc;
657 int i;
658
659 LASSERT(net != NULL);
660 LASSERT(!in_interrupt());
661
662 dev = net->ibn_dev;
663
664 cpt = lnet_cpt_of_nid(peer->ibp_nid);
665 sched = kiblnd_data.kib_scheds[cpt];
666
667 LASSERT(sched->ibs_nthreads > 0);
668
669 LIBCFS_CPT_ALLOC(init_qp_attr, lnet_cpt_table(), cpt,
670 sizeof(*init_qp_attr));
671 if (init_qp_attr == NULL) {
672 CERROR("Can't allocate qp_attr for %s\n",
673 libcfs_nid2str(peer->ibp_nid));
674 goto failed_0;
675 }
676
677 LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
678 if (conn == NULL) {
679 CERROR("Can't allocate connection for %s\n",
680 libcfs_nid2str(peer->ibp_nid));
681 goto failed_1;
682 }
683
684 conn->ibc_state = IBLND_CONN_INIT;
685 conn->ibc_version = version;
686 conn->ibc_peer = peer; /* I take the caller's ref */
687 cmid->context = conn; /* for future CM callbacks */
688 conn->ibc_cmid = cmid;
689
690 INIT_LIST_HEAD(&conn->ibc_early_rxs);
691 INIT_LIST_HEAD(&conn->ibc_tx_noops);
692 INIT_LIST_HEAD(&conn->ibc_tx_queue);
693 INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
694 INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
695 INIT_LIST_HEAD(&conn->ibc_active_txs);
696 spin_lock_init(&conn->ibc_lock);
697
698 LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
699 sizeof(*conn->ibc_connvars));
700 if (conn->ibc_connvars == NULL) {
701 CERROR("Can't allocate in-progress connection state\n");
702 goto failed_2;
703 }
704
705 write_lock_irqsave(glock, flags);
706 if (dev->ibd_failover) {
707 write_unlock_irqrestore(glock, flags);
708 CERROR("%s: failover in progress\n", dev->ibd_ifname);
709 goto failed_2;
710 }
711
712 if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
713 /* wakeup failover thread and teardown connection */
714 if (kiblnd_dev_can_failover(dev)) {
715 list_add_tail(&dev->ibd_fail_list,
716 &kiblnd_data.kib_failed_devs);
717 wake_up(&kiblnd_data.kib_failover_waitq);
718 }
719
720 write_unlock_irqrestore(glock, flags);
721 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
722 cmid->device->name, dev->ibd_ifname);
723 goto failed_2;
724 }
725
726 kiblnd_hdev_addref_locked(dev->ibd_hdev);
727 conn->ibc_hdev = dev->ibd_hdev;
728
729 kiblnd_setup_mtu_locked(cmid);
730
731 write_unlock_irqrestore(glock, flags);
732
733 LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
734 IBLND_RX_MSGS(version) * sizeof(kib_rx_t));
735 if (conn->ibc_rxs == NULL) {
736 CERROR("Cannot allocate RX buffers\n");
737 goto failed_2;
738 }
739
740 rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
741 IBLND_RX_MSG_PAGES(version));
742 if (rc != 0)
743 goto failed_2;
744
745 kiblnd_map_rx_descs(conn);
746
747 cq_attr.cqe = IBLND_CQ_ENTRIES(version);
748 cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
749 cq = ib_create_cq(cmid->device,
750 kiblnd_cq_completion, kiblnd_cq_event, conn,
751 &cq_attr);
752 if (IS_ERR(cq)) {
753 CERROR("Can't create CQ: %ld, cqe: %d\n",
754 PTR_ERR(cq), IBLND_CQ_ENTRIES(version));
755 goto failed_2;
756 }
757
758 conn->ibc_cq = cq;
759
760 rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
761 if (rc != 0) {
762 CERROR("Can't request completion notificiation: %d\n", rc);
763 goto failed_2;
764 }
765
766 init_qp_attr->event_handler = kiblnd_qp_event;
767 init_qp_attr->qp_context = conn;
768 init_qp_attr->cap.max_send_wr = IBLND_SEND_WRS(version);
769 init_qp_attr->cap.max_recv_wr = IBLND_RECV_WRS(version);
770 init_qp_attr->cap.max_send_sge = 1;
771 init_qp_attr->cap.max_recv_sge = 1;
772 init_qp_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
773 init_qp_attr->qp_type = IB_QPT_RC;
774 init_qp_attr->send_cq = cq;
775 init_qp_attr->recv_cq = cq;
776
777 conn->ibc_sched = sched;
778
779 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
780 if (rc != 0) {
781 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
782 rc, init_qp_attr->cap.max_send_wr,
783 init_qp_attr->cap.max_recv_wr);
784 goto failed_2;
785 }
786
787 LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
788
789 /* 1 ref for caller and each rxmsg */
790 atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(version));
791 conn->ibc_nrx = IBLND_RX_MSGS(version);
792
793 /* post receives */
794 for (i = 0; i < IBLND_RX_MSGS(version); i++) {
795 rc = kiblnd_post_rx(&conn->ibc_rxs[i],
796 IBLND_POSTRX_NO_CREDIT);
797 if (rc != 0) {
798 CERROR("Can't post rxmsg: %d\n", rc);
799
800 /* Make posted receives complete */
801 kiblnd_abort_receives(conn);
802
803 /* correct # of posted buffers
804 * NB locking needed now I'm racing with completion */
805 spin_lock_irqsave(&sched->ibs_lock, flags);
806 conn->ibc_nrx -= IBLND_RX_MSGS(version) - i;
807 spin_unlock_irqrestore(&sched->ibs_lock, flags);
808
809 /* cmid will be destroyed by CM(ofed) after cm_callback
810 * returned, so we can't refer it anymore
811 * (by kiblnd_connd()->kiblnd_destroy_conn) */
812 rdma_destroy_qp(conn->ibc_cmid);
813 conn->ibc_cmid = NULL;
814
815 /* Drop my own and unused rxbuffer refcounts */
816 while (i++ <= IBLND_RX_MSGS(version))
817 kiblnd_conn_decref(conn);
818
819 return NULL;
820 }
821 }
822
823 /* Init successful! */
824 LASSERT(state == IBLND_CONN_ACTIVE_CONNECT ||
825 state == IBLND_CONN_PASSIVE_WAIT);
826 conn->ibc_state = state;
827
828 /* 1 more conn */
829 atomic_inc(&net->ibn_nconns);
830 return conn;
831
832 failed_2:
833 kiblnd_destroy_conn(conn);
834 failed_1:
835 LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
836 failed_0:
837 return NULL;
838 }
839
840 void kiblnd_destroy_conn(kib_conn_t *conn)
841 {
842 struct rdma_cm_id *cmid = conn->ibc_cmid;
843 kib_peer_t *peer = conn->ibc_peer;
844 int rc;
845
846 LASSERT(!in_interrupt());
847 LASSERT(atomic_read(&conn->ibc_refcount) == 0);
848 LASSERT(list_empty(&conn->ibc_early_rxs));
849 LASSERT(list_empty(&conn->ibc_tx_noops));
850 LASSERT(list_empty(&conn->ibc_tx_queue));
851 LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
852 LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
853 LASSERT(list_empty(&conn->ibc_active_txs));
854 LASSERT(conn->ibc_noops_posted == 0);
855 LASSERT(conn->ibc_nsends_posted == 0);
856
857 switch (conn->ibc_state) {
858 default:
859 /* conn must be completely disengaged from the network */
860 LBUG();
861
862 case IBLND_CONN_DISCONNECTED:
863 /* connvars should have been freed already */
864 LASSERT(conn->ibc_connvars == NULL);
865 break;
866
867 case IBLND_CONN_INIT:
868 break;
869 }
870
871 /* conn->ibc_cmid might be destroyed by CM already */
872 if (cmid != NULL && cmid->qp != NULL)
873 rdma_destroy_qp(cmid);
874
875 if (conn->ibc_cq != NULL) {
876 rc = ib_destroy_cq(conn->ibc_cq);
877 if (rc != 0)
878 CWARN("Error destroying CQ: %d\n", rc);
879 }
880
881 if (conn->ibc_rx_pages != NULL)
882 kiblnd_unmap_rx_descs(conn);
883
884 if (conn->ibc_rxs != NULL) {
885 LIBCFS_FREE(conn->ibc_rxs,
886 IBLND_RX_MSGS(conn->ibc_version)
887 * sizeof(kib_rx_t));
888 }
889
890 if (conn->ibc_connvars != NULL)
891 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
892
893 if (conn->ibc_hdev != NULL)
894 kiblnd_hdev_decref(conn->ibc_hdev);
895
896 /* See CAVEAT EMPTOR above in kiblnd_create_conn */
897 if (conn->ibc_state != IBLND_CONN_INIT) {
898 kib_net_t *net = peer->ibp_ni->ni_data;
899
900 kiblnd_peer_decref(peer);
901 rdma_destroy_id(cmid);
902 atomic_dec(&net->ibn_nconns);
903 }
904
905 LIBCFS_FREE(conn, sizeof(*conn));
906 }
907
908 int kiblnd_close_peer_conns_locked(kib_peer_t *peer, int why)
909 {
910 kib_conn_t *conn;
911 struct list_head *ctmp;
912 struct list_head *cnxt;
913 int count = 0;
914
915 list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
916 conn = list_entry(ctmp, kib_conn_t, ibc_list);
917
918 CDEBUG(D_NET, "Closing conn -> %s, version: %x, reason: %d\n",
919 libcfs_nid2str(peer->ibp_nid),
920 conn->ibc_version, why);
921
922 kiblnd_close_conn_locked(conn, why);
923 count++;
924 }
925
926 return count;
927 }
928
929 int kiblnd_close_stale_conns_locked(kib_peer_t *peer,
930 int version, __u64 incarnation)
931 {
932 kib_conn_t *conn;
933 struct list_head *ctmp;
934 struct list_head *cnxt;
935 int count = 0;
936
937 list_for_each_safe(ctmp, cnxt, &peer->ibp_conns) {
938 conn = list_entry(ctmp, kib_conn_t, ibc_list);
939
940 if (conn->ibc_version == version &&
941 conn->ibc_incarnation == incarnation)
942 continue;
943
944 CDEBUG(D_NET,
945 "Closing stale conn -> %s version: %x, incarnation:%#llx(%x, %#llx)\n",
946 libcfs_nid2str(peer->ibp_nid),
947 conn->ibc_version, conn->ibc_incarnation,
948 version, incarnation);
949
950 kiblnd_close_conn_locked(conn, -ESTALE);
951 count++;
952 }
953
954 return count;
955 }
956
957 static int kiblnd_close_matching_conns(lnet_ni_t *ni, lnet_nid_t nid)
958 {
959 kib_peer_t *peer;
960 struct list_head *ptmp;
961 struct list_head *pnxt;
962 int lo;
963 int hi;
964 int i;
965 unsigned long flags;
966 int count = 0;
967
968 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
969
970 if (nid != LNET_NID_ANY)
971 lo = hi = kiblnd_nid2peerlist(nid) - kiblnd_data.kib_peers;
972 else {
973 lo = 0;
974 hi = kiblnd_data.kib_peer_hash_size - 1;
975 }
976
977 for (i = lo; i <= hi; i++) {
978 list_for_each_safe(ptmp, pnxt, &kiblnd_data.kib_peers[i]) {
979
980 peer = list_entry(ptmp, kib_peer_t, ibp_list);
981 LASSERT(peer->ibp_connecting > 0 ||
982 peer->ibp_accepting > 0 ||
983 !list_empty(&peer->ibp_conns));
984
985 if (peer->ibp_ni != ni)
986 continue;
987
988 if (!(nid == LNET_NID_ANY || nid == peer->ibp_nid))
989 continue;
990
991 count += kiblnd_close_peer_conns_locked(peer, 0);
992 }
993 }
994
995 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
996
997 /* wildcards always succeed */
998 if (nid == LNET_NID_ANY)
999 return 0;
1000
1001 return (count == 0) ? -ENOENT : 0;
1002 }
1003
1004 int kiblnd_ctl(lnet_ni_t *ni, unsigned int cmd, void *arg)
1005 {
1006 struct libcfs_ioctl_data *data = arg;
1007 int rc = -EINVAL;
1008
1009 switch (cmd) {
1010 case IOC_LIBCFS_GET_PEER: {
1011 lnet_nid_t nid = 0;
1012 int count = 0;
1013
1014 rc = kiblnd_get_peer_info(ni, data->ioc_count,
1015 &nid, &count);
1016 data->ioc_nid = nid;
1017 data->ioc_count = count;
1018 break;
1019 }
1020
1021 case IOC_LIBCFS_DEL_PEER: {
1022 rc = kiblnd_del_peer(ni, data->ioc_nid);
1023 break;
1024 }
1025 case IOC_LIBCFS_GET_CONN: {
1026 kib_conn_t *conn;
1027
1028 rc = 0;
1029 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1030 if (conn == NULL) {
1031 rc = -ENOENT;
1032 break;
1033 }
1034
1035 LASSERT(conn->ibc_cmid != NULL);
1036 data->ioc_nid = conn->ibc_peer->ibp_nid;
1037 if (conn->ibc_cmid->route.path_rec == NULL)
1038 data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1039 else
1040 data->ioc_u32[0] =
1041 ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1042 kiblnd_conn_decref(conn);
1043 break;
1044 }
1045 case IOC_LIBCFS_CLOSE_CONNECTION: {
1046 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1047 break;
1048 }
1049
1050 default:
1051 break;
1052 }
1053
1054 return rc;
1055 }
1056
1057 void kiblnd_query(lnet_ni_t *ni, lnet_nid_t nid, unsigned long *when)
1058 {
1059 unsigned long last_alive = 0;
1060 unsigned long now = cfs_time_current();
1061 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1062 kib_peer_t *peer;
1063 unsigned long flags;
1064
1065 read_lock_irqsave(glock, flags);
1066
1067 peer = kiblnd_find_peer_locked(nid);
1068 if (peer != NULL) {
1069 LASSERT(peer->ibp_connecting > 0 || /* creating conns */
1070 peer->ibp_accepting > 0 ||
1071 !list_empty(&peer->ibp_conns)); /* active conn */
1072 last_alive = peer->ibp_last_alive;
1073 }
1074
1075 read_unlock_irqrestore(glock, flags);
1076
1077 if (last_alive != 0)
1078 *when = last_alive;
1079
1080 /* peer is not persistent in hash, trigger peer creation
1081 * and connection establishment with a NULL tx */
1082 if (peer == NULL)
1083 kiblnd_launch_tx(ni, NULL, nid);
1084
1085 CDEBUG(D_NET, "Peer %s %p, alive %ld secs ago\n",
1086 libcfs_nid2str(nid), peer,
1087 last_alive ? cfs_duration_sec(now - last_alive) : -1);
1088 }
1089
1090 void kiblnd_free_pages(kib_pages_t *p)
1091 {
1092 int npages = p->ibp_npages;
1093 int i;
1094
1095 for (i = 0; i < npages; i++) {
1096 if (p->ibp_pages[i] != NULL)
1097 __free_page(p->ibp_pages[i]);
1098 }
1099
1100 LIBCFS_FREE(p, offsetof(kib_pages_t, ibp_pages[npages]));
1101 }
1102
1103 int kiblnd_alloc_pages(kib_pages_t **pp, int cpt, int npages)
1104 {
1105 kib_pages_t *p;
1106 int i;
1107
1108 LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1109 offsetof(kib_pages_t, ibp_pages[npages]));
1110 if (p == NULL) {
1111 CERROR("Can't allocate descriptor for %d pages\n", npages);
1112 return -ENOMEM;
1113 }
1114
1115 memset(p, 0, offsetof(kib_pages_t, ibp_pages[npages]));
1116 p->ibp_npages = npages;
1117
1118 for (i = 0; i < npages; i++) {
1119 p->ibp_pages[i] = alloc_pages_node(
1120 cfs_cpt_spread_node(lnet_cpt_table(), cpt),
1121 GFP_NOFS, 0);
1122 if (p->ibp_pages[i] == NULL) {
1123 CERROR("Can't allocate page %d of %d\n", i, npages);
1124 kiblnd_free_pages(p);
1125 return -ENOMEM;
1126 }
1127 }
1128
1129 *pp = p;
1130 return 0;
1131 }
1132
1133 void kiblnd_unmap_rx_descs(kib_conn_t *conn)
1134 {
1135 kib_rx_t *rx;
1136 int i;
1137
1138 LASSERT(conn->ibc_rxs != NULL);
1139 LASSERT(conn->ibc_hdev != NULL);
1140
1141 for (i = 0; i < IBLND_RX_MSGS(conn->ibc_version); i++) {
1142 rx = &conn->ibc_rxs[i];
1143
1144 LASSERT(rx->rx_nob >= 0); /* not posted */
1145
1146 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1147 KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1148 rx->rx_msgaddr),
1149 IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1150 }
1151
1152 kiblnd_free_pages(conn->ibc_rx_pages);
1153
1154 conn->ibc_rx_pages = NULL;
1155 }
1156
1157 void kiblnd_map_rx_descs(kib_conn_t *conn)
1158 {
1159 kib_rx_t *rx;
1160 struct page *pg;
1161 int pg_off;
1162 int ipg;
1163 int i;
1164
1165 for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn->ibc_version); i++) {
1166 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1167 rx = &conn->ibc_rxs[i];
1168
1169 rx->rx_conn = conn;
1170 rx->rx_msg = (kib_msg_t *)(((char *)page_address(pg)) + pg_off);
1171
1172 rx->rx_msgaddr = kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1173 rx->rx_msg,
1174 IBLND_MSG_SIZE,
1175 DMA_FROM_DEVICE);
1176 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1177 rx->rx_msgaddr));
1178 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1179
1180 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1181 i, rx->rx_msg, rx->rx_msgaddr,
1182 (__u64)(page_to_phys(pg) + pg_off));
1183
1184 pg_off += IBLND_MSG_SIZE;
1185 LASSERT(pg_off <= PAGE_SIZE);
1186
1187 if (pg_off == PAGE_SIZE) {
1188 pg_off = 0;
1189 ipg++;
1190 LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn->ibc_version));
1191 }
1192 }
1193 }
1194
1195 static void kiblnd_unmap_tx_pool(kib_tx_pool_t *tpo)
1196 {
1197 kib_hca_dev_t *hdev = tpo->tpo_hdev;
1198 kib_tx_t *tx;
1199 int i;
1200
1201 LASSERT(tpo->tpo_pool.po_allocated == 0);
1202
1203 if (hdev == NULL)
1204 return;
1205
1206 for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1207 tx = &tpo->tpo_tx_descs[i];
1208 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1209 KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1210 tx->tx_msgaddr),
1211 IBLND_MSG_SIZE, DMA_TO_DEVICE);
1212 }
1213
1214 kiblnd_hdev_decref(hdev);
1215 tpo->tpo_hdev = NULL;
1216 }
1217
1218 static kib_hca_dev_t *kiblnd_current_hdev(kib_dev_t *dev)
1219 {
1220 kib_hca_dev_t *hdev;
1221 unsigned long flags;
1222 int i = 0;
1223
1224 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1225 while (dev->ibd_failover) {
1226 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1227 if (i++ % 50 == 0)
1228 CDEBUG(D_NET, "%s: Wait for failover\n",
1229 dev->ibd_ifname);
1230 schedule_timeout(cfs_time_seconds(1) / 100);
1231
1232 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1233 }
1234
1235 kiblnd_hdev_addref_locked(dev->ibd_hdev);
1236 hdev = dev->ibd_hdev;
1237
1238 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1239
1240 return hdev;
1241 }
1242
1243 static void kiblnd_map_tx_pool(kib_tx_pool_t *tpo)
1244 {
1245 kib_pages_t *txpgs = tpo->tpo_tx_pages;
1246 kib_pool_t *pool = &tpo->tpo_pool;
1247 kib_net_t *net = pool->po_owner->ps_net;
1248 kib_dev_t *dev;
1249 struct page *page;
1250 kib_tx_t *tx;
1251 int page_offset;
1252 int ipage;
1253 int i;
1254
1255 LASSERT(net != NULL);
1256
1257 dev = net->ibn_dev;
1258
1259 /* pre-mapped messages are not bigger than 1 page */
1260 CLASSERT(IBLND_MSG_SIZE <= PAGE_SIZE);
1261
1262 /* No fancy arithmetic when we do the buffer calculations */
1263 CLASSERT(PAGE_SIZE % IBLND_MSG_SIZE == 0);
1264
1265 tpo->tpo_hdev = kiblnd_current_hdev(dev);
1266
1267 for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1268 page = txpgs->ibp_pages[ipage];
1269 tx = &tpo->tpo_tx_descs[i];
1270
1271 tx->tx_msg = (kib_msg_t *)(((char *)page_address(page)) +
1272 page_offset);
1273
1274 tx->tx_msgaddr = kiblnd_dma_map_single(
1275 tpo->tpo_hdev->ibh_ibdev, tx->tx_msg,
1276 IBLND_MSG_SIZE, DMA_TO_DEVICE);
1277 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1278 tx->tx_msgaddr));
1279 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1280
1281 list_add(&tx->tx_list, &pool->po_free_list);
1282
1283 page_offset += IBLND_MSG_SIZE;
1284 LASSERT(page_offset <= PAGE_SIZE);
1285
1286 if (page_offset == PAGE_SIZE) {
1287 page_offset = 0;
1288 ipage++;
1289 LASSERT(ipage <= txpgs->ibp_npages);
1290 }
1291 }
1292 }
1293
1294 struct ib_mr *kiblnd_find_dma_mr(kib_hca_dev_t *hdev, __u64 addr, __u64 size)
1295 {
1296 __u64 index;
1297
1298 LASSERT(hdev->ibh_mrs[0] != NULL);
1299
1300 if (hdev->ibh_nmrs == 1)
1301 return hdev->ibh_mrs[0];
1302
1303 index = addr >> hdev->ibh_mr_shift;
1304
1305 if (index < hdev->ibh_nmrs &&
1306 index == ((addr + size - 1) >> hdev->ibh_mr_shift))
1307 return hdev->ibh_mrs[index];
1308
1309 return NULL;
1310 }
1311
1312 struct ib_mr *kiblnd_find_rd_dma_mr(kib_hca_dev_t *hdev, kib_rdma_desc_t *rd)
1313 {
1314 struct ib_mr *prev_mr;
1315 struct ib_mr *mr;
1316 int i;
1317
1318 LASSERT(hdev->ibh_mrs[0] != NULL);
1319
1320 if (*kiblnd_tunables.kib_map_on_demand > 0 &&
1321 *kiblnd_tunables.kib_map_on_demand <= rd->rd_nfrags)
1322 return NULL;
1323
1324 if (hdev->ibh_nmrs == 1)
1325 return hdev->ibh_mrs[0];
1326
1327 for (i = 0, mr = prev_mr = NULL;
1328 i < rd->rd_nfrags; i++) {
1329 mr = kiblnd_find_dma_mr(hdev,
1330 rd->rd_frags[i].rf_addr,
1331 rd->rd_frags[i].rf_nob);
1332 if (prev_mr == NULL)
1333 prev_mr = mr;
1334
1335 if (mr == NULL || prev_mr != mr) {
1336 /* Can't covered by one single MR */
1337 mr = NULL;
1338 break;
1339 }
1340 }
1341
1342 return mr;
1343 }
1344
1345 static void kiblnd_destroy_fmr_pool(kib_fmr_pool_t *pool)
1346 {
1347 LASSERT(pool->fpo_map_count == 0);
1348
1349 if (pool->fpo_fmr_pool != NULL)
1350 ib_destroy_fmr_pool(pool->fpo_fmr_pool);
1351
1352 if (pool->fpo_hdev != NULL)
1353 kiblnd_hdev_decref(pool->fpo_hdev);
1354
1355 LIBCFS_FREE(pool, sizeof(kib_fmr_pool_t));
1356 }
1357
1358 static void kiblnd_destroy_fmr_pool_list(struct list_head *head)
1359 {
1360 kib_fmr_pool_t *pool;
1361
1362 while (!list_empty(head)) {
1363 pool = list_entry(head->next, kib_fmr_pool_t, fpo_list);
1364 list_del(&pool->fpo_list);
1365 kiblnd_destroy_fmr_pool(pool);
1366 }
1367 }
1368
1369 static int kiblnd_fmr_pool_size(int ncpts)
1370 {
1371 int size = *kiblnd_tunables.kib_fmr_pool_size / ncpts;
1372
1373 return max(IBLND_FMR_POOL, size);
1374 }
1375
1376 static int kiblnd_fmr_flush_trigger(int ncpts)
1377 {
1378 int size = *kiblnd_tunables.kib_fmr_flush_trigger / ncpts;
1379
1380 return max(IBLND_FMR_POOL_FLUSH, size);
1381 }
1382
1383 static int kiblnd_create_fmr_pool(kib_fmr_poolset_t *fps,
1384 kib_fmr_pool_t **pp_fpo)
1385 {
1386 /* FMR pool for RDMA */
1387 kib_dev_t *dev = fps->fps_net->ibn_dev;
1388 kib_fmr_pool_t *fpo;
1389 struct ib_fmr_pool_param param = {
1390 .max_pages_per_fmr = LNET_MAX_PAYLOAD/PAGE_SIZE,
1391 .page_shift = PAGE_SHIFT,
1392 .access = (IB_ACCESS_LOCAL_WRITE |
1393 IB_ACCESS_REMOTE_WRITE),
1394 .pool_size = fps->fps_pool_size,
1395 .dirty_watermark = fps->fps_flush_trigger,
1396 .flush_function = NULL,
1397 .flush_arg = NULL,
1398 .cache = !!*kiblnd_tunables.kib_fmr_cache};
1399 int rc;
1400
1401 LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1402 if (fpo == NULL)
1403 return -ENOMEM;
1404
1405 fpo->fpo_hdev = kiblnd_current_hdev(dev);
1406
1407 fpo->fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd, &param);
1408 if (IS_ERR(fpo->fpo_fmr_pool)) {
1409 rc = PTR_ERR(fpo->fpo_fmr_pool);
1410 CERROR("Failed to create FMR pool: %d\n", rc);
1411
1412 kiblnd_hdev_decref(fpo->fpo_hdev);
1413 LIBCFS_FREE(fpo, sizeof(kib_fmr_pool_t));
1414 return rc;
1415 }
1416
1417 fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1418 fpo->fpo_owner = fps;
1419 *pp_fpo = fpo;
1420
1421 return 0;
1422 }
1423
1424 static void kiblnd_fail_fmr_poolset(kib_fmr_poolset_t *fps,
1425 struct list_head *zombies)
1426 {
1427 if (fps->fps_net == NULL) /* intialized? */
1428 return;
1429
1430 spin_lock(&fps->fps_lock);
1431
1432 while (!list_empty(&fps->fps_pool_list)) {
1433 kib_fmr_pool_t *fpo = list_entry(fps->fps_pool_list.next,
1434 kib_fmr_pool_t, fpo_list);
1435 fpo->fpo_failed = 1;
1436 list_del(&fpo->fpo_list);
1437 if (fpo->fpo_map_count == 0)
1438 list_add(&fpo->fpo_list, zombies);
1439 else
1440 list_add(&fpo->fpo_list, &fps->fps_failed_pool_list);
1441 }
1442
1443 spin_unlock(&fps->fps_lock);
1444 }
1445
1446 static void kiblnd_fini_fmr_poolset(kib_fmr_poolset_t *fps)
1447 {
1448 if (fps->fps_net != NULL) { /* initialized? */
1449 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1450 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1451 }
1452 }
1453
1454 static int kiblnd_init_fmr_poolset(kib_fmr_poolset_t *fps, int cpt,
1455 kib_net_t *net, int pool_size,
1456 int flush_trigger)
1457 {
1458 kib_fmr_pool_t *fpo;
1459 int rc;
1460
1461 memset(fps, 0, sizeof(kib_fmr_poolset_t));
1462
1463 fps->fps_net = net;
1464 fps->fps_cpt = cpt;
1465 fps->fps_pool_size = pool_size;
1466 fps->fps_flush_trigger = flush_trigger;
1467 spin_lock_init(&fps->fps_lock);
1468 INIT_LIST_HEAD(&fps->fps_pool_list);
1469 INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1470
1471 rc = kiblnd_create_fmr_pool(fps, &fpo);
1472 if (rc == 0)
1473 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1474
1475 return rc;
1476 }
1477
1478 static int kiblnd_fmr_pool_is_idle(kib_fmr_pool_t *fpo, unsigned long now)
1479 {
1480 if (fpo->fpo_map_count != 0) /* still in use */
1481 return 0;
1482 if (fpo->fpo_failed)
1483 return 1;
1484 return cfs_time_aftereq(now, fpo->fpo_deadline);
1485 }
1486
1487 void kiblnd_fmr_pool_unmap(kib_fmr_t *fmr, int status)
1488 {
1489 LIST_HEAD(zombies);
1490 kib_fmr_pool_t *fpo = fmr->fmr_pool;
1491 kib_fmr_poolset_t *fps = fpo->fpo_owner;
1492 unsigned long now = cfs_time_current();
1493 kib_fmr_pool_t *tmp;
1494 int rc;
1495
1496 rc = ib_fmr_pool_unmap(fmr->fmr_pfmr);
1497 LASSERT(rc == 0);
1498
1499 if (status != 0) {
1500 rc = ib_flush_fmr_pool(fpo->fpo_fmr_pool);
1501 LASSERT(rc == 0);
1502 }
1503
1504 fmr->fmr_pool = NULL;
1505 fmr->fmr_pfmr = NULL;
1506
1507 spin_lock(&fps->fps_lock);
1508 fpo->fpo_map_count--; /* decref the pool */
1509
1510 list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1511 /* the first pool is persistent */
1512 if (fps->fps_pool_list.next == &fpo->fpo_list)
1513 continue;
1514
1515 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1516 list_move(&fpo->fpo_list, &zombies);
1517 fps->fps_version++;
1518 }
1519 }
1520 spin_unlock(&fps->fps_lock);
1521
1522 if (!list_empty(&zombies))
1523 kiblnd_destroy_fmr_pool_list(&zombies);
1524 }
1525
1526 int kiblnd_fmr_pool_map(kib_fmr_poolset_t *fps, __u64 *pages, int npages,
1527 __u64 iov, kib_fmr_t *fmr)
1528 {
1529 struct ib_pool_fmr *pfmr;
1530 kib_fmr_pool_t *fpo;
1531 __u64 version;
1532 int rc;
1533
1534 again:
1535 spin_lock(&fps->fps_lock);
1536 version = fps->fps_version;
1537 list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
1538 fpo->fpo_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1539 fpo->fpo_map_count++;
1540 spin_unlock(&fps->fps_lock);
1541
1542 pfmr = ib_fmr_pool_map_phys(fpo->fpo_fmr_pool,
1543 pages, npages, iov);
1544 if (likely(!IS_ERR(pfmr))) {
1545 fmr->fmr_pool = fpo;
1546 fmr->fmr_pfmr = pfmr;
1547 return 0;
1548 }
1549
1550 spin_lock(&fps->fps_lock);
1551 fpo->fpo_map_count--;
1552 if (PTR_ERR(pfmr) != -EAGAIN) {
1553 spin_unlock(&fps->fps_lock);
1554 return PTR_ERR(pfmr);
1555 }
1556
1557 /* EAGAIN and ... */
1558 if (version != fps->fps_version) {
1559 spin_unlock(&fps->fps_lock);
1560 goto again;
1561 }
1562 }
1563
1564 if (fps->fps_increasing) {
1565 spin_unlock(&fps->fps_lock);
1566 CDEBUG(D_NET,
1567 "Another thread is allocating new FMR pool, waiting for her to complete\n");
1568 schedule();
1569 goto again;
1570
1571 }
1572
1573 if (time_before(cfs_time_current(), fps->fps_next_retry)) {
1574 /* someone failed recently */
1575 spin_unlock(&fps->fps_lock);
1576 return -EAGAIN;
1577 }
1578
1579 fps->fps_increasing = 1;
1580 spin_unlock(&fps->fps_lock);
1581
1582 CDEBUG(D_NET, "Allocate new FMR pool\n");
1583 rc = kiblnd_create_fmr_pool(fps, &fpo);
1584 spin_lock(&fps->fps_lock);
1585 fps->fps_increasing = 0;
1586 if (rc == 0) {
1587 fps->fps_version++;
1588 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1589 } else {
1590 fps->fps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1591 }
1592 spin_unlock(&fps->fps_lock);
1593
1594 goto again;
1595 }
1596
1597 static void kiblnd_fini_pool(kib_pool_t *pool)
1598 {
1599 LASSERT(list_empty(&pool->po_free_list));
1600 LASSERT(pool->po_allocated == 0);
1601
1602 CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
1603 }
1604
1605 static void kiblnd_init_pool(kib_poolset_t *ps, kib_pool_t *pool, int size)
1606 {
1607 CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
1608
1609 memset(pool, 0, sizeof(kib_pool_t));
1610 INIT_LIST_HEAD(&pool->po_free_list);
1611 pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1612 pool->po_owner = ps;
1613 pool->po_size = size;
1614 }
1615
1616 static void kiblnd_destroy_pool_list(struct list_head *head)
1617 {
1618 kib_pool_t *pool;
1619
1620 while (!list_empty(head)) {
1621 pool = list_entry(head->next, kib_pool_t, po_list);
1622 list_del(&pool->po_list);
1623
1624 LASSERT(pool->po_owner != NULL);
1625 pool->po_owner->ps_pool_destroy(pool);
1626 }
1627 }
1628
1629 static void kiblnd_fail_poolset(kib_poolset_t *ps, struct list_head *zombies)
1630 {
1631 if (ps->ps_net == NULL) /* intialized? */
1632 return;
1633
1634 spin_lock(&ps->ps_lock);
1635 while (!list_empty(&ps->ps_pool_list)) {
1636 kib_pool_t *po = list_entry(ps->ps_pool_list.next,
1637 kib_pool_t, po_list);
1638 po->po_failed = 1;
1639 list_del(&po->po_list);
1640 if (po->po_allocated == 0)
1641 list_add(&po->po_list, zombies);
1642 else
1643 list_add(&po->po_list, &ps->ps_failed_pool_list);
1644 }
1645 spin_unlock(&ps->ps_lock);
1646 }
1647
1648 static void kiblnd_fini_poolset(kib_poolset_t *ps)
1649 {
1650 if (ps->ps_net != NULL) { /* initialized? */
1651 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
1652 kiblnd_destroy_pool_list(&ps->ps_pool_list);
1653 }
1654 }
1655
1656 static int kiblnd_init_poolset(kib_poolset_t *ps, int cpt,
1657 kib_net_t *net, char *name, int size,
1658 kib_ps_pool_create_t po_create,
1659 kib_ps_pool_destroy_t po_destroy,
1660 kib_ps_node_init_t nd_init,
1661 kib_ps_node_fini_t nd_fini)
1662 {
1663 kib_pool_t *pool;
1664 int rc;
1665
1666 memset(ps, 0, sizeof(kib_poolset_t));
1667
1668 ps->ps_cpt = cpt;
1669 ps->ps_net = net;
1670 ps->ps_pool_create = po_create;
1671 ps->ps_pool_destroy = po_destroy;
1672 ps->ps_node_init = nd_init;
1673 ps->ps_node_fini = nd_fini;
1674 ps->ps_pool_size = size;
1675 if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
1676 >= sizeof(ps->ps_name))
1677 return -E2BIG;
1678 spin_lock_init(&ps->ps_lock);
1679 INIT_LIST_HEAD(&ps->ps_pool_list);
1680 INIT_LIST_HEAD(&ps->ps_failed_pool_list);
1681
1682 rc = ps->ps_pool_create(ps, size, &pool);
1683 if (rc == 0)
1684 list_add(&pool->po_list, &ps->ps_pool_list);
1685 else
1686 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
1687
1688 return rc;
1689 }
1690
1691 static int kiblnd_pool_is_idle(kib_pool_t *pool, unsigned long now)
1692 {
1693 if (pool->po_allocated != 0) /* still in use */
1694 return 0;
1695 if (pool->po_failed)
1696 return 1;
1697 return cfs_time_aftereq(now, pool->po_deadline);
1698 }
1699
1700 void kiblnd_pool_free_node(kib_pool_t *pool, struct list_head *node)
1701 {
1702 LIST_HEAD(zombies);
1703 kib_poolset_t *ps = pool->po_owner;
1704 kib_pool_t *tmp;
1705 unsigned long now = cfs_time_current();
1706
1707 spin_lock(&ps->ps_lock);
1708
1709 if (ps->ps_node_fini != NULL)
1710 ps->ps_node_fini(pool, node);
1711
1712 LASSERT(pool->po_allocated > 0);
1713 list_add(node, &pool->po_free_list);
1714 pool->po_allocated--;
1715
1716 list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
1717 /* the first pool is persistent */
1718 if (ps->ps_pool_list.next == &pool->po_list)
1719 continue;
1720
1721 if (kiblnd_pool_is_idle(pool, now))
1722 list_move(&pool->po_list, &zombies);
1723 }
1724 spin_unlock(&ps->ps_lock);
1725
1726 if (!list_empty(&zombies))
1727 kiblnd_destroy_pool_list(&zombies);
1728 }
1729
1730 struct list_head *kiblnd_pool_alloc_node(kib_poolset_t *ps)
1731 {
1732 struct list_head *node;
1733 kib_pool_t *pool;
1734 int rc;
1735
1736 again:
1737 spin_lock(&ps->ps_lock);
1738 list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
1739 if (list_empty(&pool->po_free_list))
1740 continue;
1741
1742 pool->po_allocated++;
1743 pool->po_deadline = cfs_time_shift(IBLND_POOL_DEADLINE);
1744 node = pool->po_free_list.next;
1745 list_del(node);
1746
1747 if (ps->ps_node_init != NULL) {
1748 /* still hold the lock */
1749 ps->ps_node_init(pool, node);
1750 }
1751 spin_unlock(&ps->ps_lock);
1752 return node;
1753 }
1754
1755 /* no available tx pool and ... */
1756 if (ps->ps_increasing) {
1757 /* another thread is allocating a new pool */
1758 spin_unlock(&ps->ps_lock);
1759 CDEBUG(D_NET, "Another thread is allocating new %s pool, waiting for her to complete\n",
1760 ps->ps_name);
1761 schedule();
1762 goto again;
1763 }
1764
1765 if (time_before(cfs_time_current(), ps->ps_next_retry)) {
1766 /* someone failed recently */
1767 spin_unlock(&ps->ps_lock);
1768 return NULL;
1769 }
1770
1771 ps->ps_increasing = 1;
1772 spin_unlock(&ps->ps_lock);
1773
1774 CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
1775
1776 rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
1777
1778 spin_lock(&ps->ps_lock);
1779 ps->ps_increasing = 0;
1780 if (rc == 0) {
1781 list_add_tail(&pool->po_list, &ps->ps_pool_list);
1782 } else {
1783 ps->ps_next_retry = cfs_time_shift(IBLND_POOL_RETRY);
1784 CERROR("Can't allocate new %s pool because out of memory\n",
1785 ps->ps_name);
1786 }
1787 spin_unlock(&ps->ps_lock);
1788
1789 goto again;
1790 }
1791
1792 static void kiblnd_destroy_tx_pool(kib_pool_t *pool)
1793 {
1794 kib_tx_pool_t *tpo = container_of(pool, kib_tx_pool_t, tpo_pool);
1795 int i;
1796
1797 LASSERT(pool->po_allocated == 0);
1798
1799 if (tpo->tpo_tx_pages != NULL) {
1800 kiblnd_unmap_tx_pool(tpo);
1801 kiblnd_free_pages(tpo->tpo_tx_pages);
1802 }
1803
1804 if (tpo->tpo_tx_descs == NULL)
1805 goto out;
1806
1807 for (i = 0; i < pool->po_size; i++) {
1808 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
1809
1810 list_del(&tx->tx_list);
1811 if (tx->tx_pages != NULL)
1812 LIBCFS_FREE(tx->tx_pages,
1813 LNET_MAX_IOV *
1814 sizeof(*tx->tx_pages));
1815 if (tx->tx_frags != NULL)
1816 LIBCFS_FREE(tx->tx_frags,
1817 IBLND_MAX_RDMA_FRAGS *
1818 sizeof(*tx->tx_frags));
1819 if (tx->tx_wrq != NULL)
1820 LIBCFS_FREE(tx->tx_wrq,
1821 (1 + IBLND_MAX_RDMA_FRAGS) *
1822 sizeof(*tx->tx_wrq));
1823 if (tx->tx_sge != NULL)
1824 LIBCFS_FREE(tx->tx_sge,
1825 (1 + IBLND_MAX_RDMA_FRAGS) *
1826 sizeof(*tx->tx_sge));
1827 if (tx->tx_rd != NULL)
1828 LIBCFS_FREE(tx->tx_rd,
1829 offsetof(kib_rdma_desc_t,
1830 rd_frags[IBLND_MAX_RDMA_FRAGS]));
1831 }
1832
1833 LIBCFS_FREE(tpo->tpo_tx_descs,
1834 pool->po_size * sizeof(kib_tx_t));
1835 out:
1836 kiblnd_fini_pool(pool);
1837 LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
1838 }
1839
1840 static int kiblnd_tx_pool_size(int ncpts)
1841 {
1842 int ntx = *kiblnd_tunables.kib_ntx / ncpts;
1843
1844 return max(IBLND_TX_POOL, ntx);
1845 }
1846
1847 static int kiblnd_create_tx_pool(kib_poolset_t *ps, int size,
1848 kib_pool_t **pp_po)
1849 {
1850 int i;
1851 int npg;
1852 kib_pool_t *pool;
1853 kib_tx_pool_t *tpo;
1854
1855 LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
1856 if (tpo == NULL) {
1857 CERROR("Failed to allocate TX pool\n");
1858 return -ENOMEM;
1859 }
1860
1861 pool = &tpo->tpo_pool;
1862 kiblnd_init_pool(ps, pool, size);
1863 tpo->tpo_tx_descs = NULL;
1864 tpo->tpo_tx_pages = NULL;
1865
1866 npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
1867 if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
1868 CERROR("Can't allocate tx pages: %d\n", npg);
1869 LIBCFS_FREE(tpo, sizeof(kib_tx_pool_t));
1870 return -ENOMEM;
1871 }
1872
1873 LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
1874 size * sizeof(kib_tx_t));
1875 if (tpo->tpo_tx_descs == NULL) {
1876 CERROR("Can't allocate %d tx descriptors\n", size);
1877 ps->ps_pool_destroy(pool);
1878 return -ENOMEM;
1879 }
1880
1881 memset(tpo->tpo_tx_descs, 0, size * sizeof(kib_tx_t));
1882
1883 for (i = 0; i < size; i++) {
1884 kib_tx_t *tx = &tpo->tpo_tx_descs[i];
1885
1886 tx->tx_pool = tpo;
1887 if (ps->ps_net->ibn_fmr_ps != NULL) {
1888 LIBCFS_CPT_ALLOC(tx->tx_pages,
1889 lnet_cpt_table(), ps->ps_cpt,
1890 LNET_MAX_IOV * sizeof(*tx->tx_pages));
1891 if (tx->tx_pages == NULL)
1892 break;
1893 }
1894
1895 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
1896 IBLND_MAX_RDMA_FRAGS * sizeof(*tx->tx_frags));
1897 if (tx->tx_frags == NULL)
1898 break;
1899
1900 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS);
1901
1902 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
1903 (1 + IBLND_MAX_RDMA_FRAGS) *
1904 sizeof(*tx->tx_wrq));
1905 if (tx->tx_wrq == NULL)
1906 break;
1907
1908 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
1909 (1 + IBLND_MAX_RDMA_FRAGS) *
1910 sizeof(*tx->tx_sge));
1911 if (tx->tx_sge == NULL)
1912 break;
1913
1914 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
1915 offsetof(kib_rdma_desc_t,
1916 rd_frags[IBLND_MAX_RDMA_FRAGS]));
1917 if (tx->tx_rd == NULL)
1918 break;
1919 }
1920
1921 if (i == size) {
1922 kiblnd_map_tx_pool(tpo);
1923 *pp_po = pool;
1924 return 0;
1925 }
1926
1927 ps->ps_pool_destroy(pool);
1928 return -ENOMEM;
1929 }
1930
1931 static void kiblnd_tx_init(kib_pool_t *pool, struct list_head *node)
1932 {
1933 kib_tx_poolset_t *tps = container_of(pool->po_owner, kib_tx_poolset_t,
1934 tps_poolset);
1935 kib_tx_t *tx = list_entry(node, kib_tx_t, tx_list);
1936
1937 tx->tx_cookie = tps->tps_next_tx_cookie++;
1938 }
1939
1940 static void kiblnd_net_fini_pools(kib_net_t *net)
1941 {
1942 int i;
1943
1944 cfs_cpt_for_each(i, lnet_cpt_table()) {
1945 kib_tx_poolset_t *tps;
1946 kib_fmr_poolset_t *fps;
1947
1948 if (net->ibn_tx_ps != NULL) {
1949 tps = net->ibn_tx_ps[i];
1950 kiblnd_fini_poolset(&tps->tps_poolset);
1951 }
1952
1953 if (net->ibn_fmr_ps != NULL) {
1954 fps = net->ibn_fmr_ps[i];
1955 kiblnd_fini_fmr_poolset(fps);
1956 }
1957 }
1958
1959 if (net->ibn_tx_ps != NULL) {
1960 cfs_percpt_free(net->ibn_tx_ps);
1961 net->ibn_tx_ps = NULL;
1962 }
1963
1964 if (net->ibn_fmr_ps != NULL) {
1965 cfs_percpt_free(net->ibn_fmr_ps);
1966 net->ibn_fmr_ps = NULL;
1967 }
1968 }
1969
1970 static int kiblnd_net_init_pools(kib_net_t *net, __u32 *cpts, int ncpts)
1971 {
1972 unsigned long flags;
1973 int cpt;
1974 int rc = 0;
1975 int i;
1976
1977 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1978 if (*kiblnd_tunables.kib_map_on_demand == 0 &&
1979 net->ibn_dev->ibd_hdev->ibh_nmrs == 1) {
1980 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1981 goto create_tx_pool;
1982 }
1983
1984 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1985
1986 if (*kiblnd_tunables.kib_fmr_pool_size <
1987 *kiblnd_tunables.kib_ntx / 4) {
1988 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
1989 *kiblnd_tunables.kib_fmr_pool_size,
1990 *kiblnd_tunables.kib_ntx / 4);
1991 rc = -EINVAL;
1992 goto failed;
1993 }
1994
1995 /*
1996 * TX pool must be created later than FMR, see LU-2268
1997 * for details
1998 */
1999 LASSERT(net->ibn_tx_ps == NULL);
2000
2001 /*
2002 * premapping can fail if ibd_nmr > 1, so we always create
2003 * FMR pool and map-on-demand if premapping failed
2004 */
2005
2006 net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2007 sizeof(kib_fmr_poolset_t));
2008 if (net->ibn_fmr_ps == NULL) {
2009 CERROR("Failed to allocate FMR pool array\n");
2010 rc = -ENOMEM;
2011 goto failed;
2012 }
2013
2014 for (i = 0; i < ncpts; i++) {
2015 cpt = (cpts == NULL) ? i : cpts[i];
2016 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, net,
2017 kiblnd_fmr_pool_size(ncpts),
2018 kiblnd_fmr_flush_trigger(ncpts));
2019 if (rc == -ENOSYS && i == 0) /* no FMR */
2020 break;
2021
2022 if (rc != 0) { /* a real error */
2023 CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2024 cpt, rc);
2025 goto failed;
2026 }
2027 }
2028
2029 if (i > 0) {
2030 LASSERT(i == ncpts);
2031 goto create_tx_pool;
2032 }
2033
2034 cfs_percpt_free(net->ibn_fmr_ps);
2035 net->ibn_fmr_ps = NULL;
2036
2037 CWARN("Device does not support FMR\n");
2038 goto failed;
2039
2040 create_tx_pool:
2041 net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2042 sizeof(kib_tx_poolset_t));
2043 if (net->ibn_tx_ps == NULL) {
2044 CERROR("Failed to allocate tx pool array\n");
2045 rc = -ENOMEM;
2046 goto failed;
2047 }
2048
2049 for (i = 0; i < ncpts; i++) {
2050 cpt = (cpts == NULL) ? i : cpts[i];
2051 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2052 cpt, net, "TX",
2053 kiblnd_tx_pool_size(ncpts),
2054 kiblnd_create_tx_pool,
2055 kiblnd_destroy_tx_pool,
2056 kiblnd_tx_init, NULL);
2057 if (rc != 0) {
2058 CERROR("Can't initialize TX pool for CPT %d: %d\n",
2059 cpt, rc);
2060 goto failed;
2061 }
2062 }
2063
2064 return 0;
2065 failed:
2066 kiblnd_net_fini_pools(net);
2067 LASSERT(rc != 0);
2068 return rc;
2069 }
2070
2071 static int kiblnd_hdev_get_attr(kib_hca_dev_t *hdev)
2072 {
2073 struct ib_device_attr *attr;
2074 int rc;
2075
2076 /* It's safe to assume a HCA can handle a page size
2077 * matching that of the native system */
2078 hdev->ibh_page_shift = PAGE_SHIFT;
2079 hdev->ibh_page_size = 1 << PAGE_SHIFT;
2080 hdev->ibh_page_mask = ~((__u64)hdev->ibh_page_size - 1);
2081
2082 LIBCFS_ALLOC(attr, sizeof(*attr));
2083 if (attr == NULL) {
2084 CERROR("Out of memory\n");
2085 return -ENOMEM;
2086 }
2087
2088 rc = ib_query_device(hdev->ibh_ibdev, attr);
2089 if (rc == 0)
2090 hdev->ibh_mr_size = attr->max_mr_size;
2091
2092 LIBCFS_FREE(attr, sizeof(*attr));
2093
2094 if (rc != 0) {
2095 CERROR("Failed to query IB device: %d\n", rc);
2096 return rc;
2097 }
2098
2099 if (hdev->ibh_mr_size == ~0ULL) {
2100 hdev->ibh_mr_shift = 64;
2101 return 0;
2102 }
2103
2104 for (hdev->ibh_mr_shift = 0;
2105 hdev->ibh_mr_shift < 64; hdev->ibh_mr_shift++) {
2106 if (hdev->ibh_mr_size == (1ULL << hdev->ibh_mr_shift) ||
2107 hdev->ibh_mr_size == (1ULL << hdev->ibh_mr_shift) - 1)
2108 return 0;
2109 }
2110
2111 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2112 return -EINVAL;
2113 }
2114
2115 static void kiblnd_hdev_cleanup_mrs(kib_hca_dev_t *hdev)
2116 {
2117 int i;
2118
2119 if (hdev->ibh_nmrs == 0 || hdev->ibh_mrs == NULL)
2120 return;
2121
2122 for (i = 0; i < hdev->ibh_nmrs; i++) {
2123 if (hdev->ibh_mrs[i] == NULL)
2124 break;
2125
2126 ib_dereg_mr(hdev->ibh_mrs[i]);
2127 }
2128
2129 LIBCFS_FREE(hdev->ibh_mrs, sizeof(*hdev->ibh_mrs) * hdev->ibh_nmrs);
2130 hdev->ibh_mrs = NULL;
2131 hdev->ibh_nmrs = 0;
2132 }
2133
2134 void kiblnd_hdev_destroy(kib_hca_dev_t *hdev)
2135 {
2136 kiblnd_hdev_cleanup_mrs(hdev);
2137
2138 if (hdev->ibh_pd != NULL)
2139 ib_dealloc_pd(hdev->ibh_pd);
2140
2141 if (hdev->ibh_cmid != NULL)
2142 rdma_destroy_id(hdev->ibh_cmid);
2143
2144 LIBCFS_FREE(hdev, sizeof(*hdev));
2145 }
2146
2147 static int kiblnd_hdev_setup_mrs(kib_hca_dev_t *hdev)
2148 {
2149 struct ib_mr *mr;
2150 int rc;
2151 int acflags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE;
2152
2153 rc = kiblnd_hdev_get_attr(hdev);
2154 if (rc != 0)
2155 return rc;
2156
2157 LIBCFS_ALLOC(hdev->ibh_mrs, 1 * sizeof(*hdev->ibh_mrs));
2158 if (hdev->ibh_mrs == NULL) {
2159 CERROR("Failed to allocate MRs table\n");
2160 return -ENOMEM;
2161 }
2162
2163 hdev->ibh_mrs[0] = NULL;
2164 hdev->ibh_nmrs = 1;
2165
2166 mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2167 if (IS_ERR(mr)) {
2168 CERROR("Failed ib_get_dma_mr : %ld\n", PTR_ERR(mr));
2169 kiblnd_hdev_cleanup_mrs(hdev);
2170 return PTR_ERR(mr);
2171 }
2172
2173 hdev->ibh_mrs[0] = mr;
2174
2175 return 0;
2176 }
2177
2178 /* DUMMY */
2179 static int kiblnd_dummy_callback(struct rdma_cm_id *cmid,
2180 struct rdma_cm_event *event)
2181 {
2182 return 0;
2183 }
2184
2185 static int kiblnd_dev_need_failover(kib_dev_t *dev)
2186 {
2187 struct rdma_cm_id *cmid;
2188 struct sockaddr_in srcaddr;
2189 struct sockaddr_in dstaddr;
2190 int rc;
2191
2192 if (dev->ibd_hdev == NULL || /* initializing */
2193 dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2194 *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2195 return 1;
2196
2197 /* XXX: it's UGLY, but I don't have better way to find
2198 * ib-bonding HCA failover because:
2199 *
2200 * a. no reliable CM event for HCA failover...
2201 * b. no OFED API to get ib_device for current net_device...
2202 *
2203 * We have only two choices at this point:
2204 *
2205 * a. rdma_bind_addr(), it will conflict with listener cmid
2206 * b. rdma_resolve_addr() to zero addr */
2207 cmid = kiblnd_rdma_create_id(kiblnd_dummy_callback, dev, RDMA_PS_TCP,
2208 IB_QPT_RC);
2209 if (IS_ERR(cmid)) {
2210 rc = PTR_ERR(cmid);
2211 CERROR("Failed to create cmid for failover: %d\n", rc);
2212 return rc;
2213 }
2214
2215 memset(&srcaddr, 0, sizeof(srcaddr));
2216 srcaddr.sin_family = AF_INET;
2217 srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2218
2219 memset(&dstaddr, 0, sizeof(dstaddr));
2220 dstaddr.sin_family = AF_INET;
2221 rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2222 (struct sockaddr *)&dstaddr, 1);
2223 if (rc != 0 || cmid->device == NULL) {
2224 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2225 dev->ibd_ifname, &dev->ibd_ifip,
2226 cmid->device, rc);
2227 rdma_destroy_id(cmid);
2228 return rc;
2229 }
2230
2231 rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2232 rdma_destroy_id(cmid);
2233
2234 return rc;
2235 }
2236
2237 int kiblnd_dev_failover(kib_dev_t *dev)
2238 {
2239 LIST_HEAD(zombie_tpo);
2240 LIST_HEAD(zombie_ppo);
2241 LIST_HEAD(zombie_fpo);
2242 struct rdma_cm_id *cmid = NULL;
2243 kib_hca_dev_t *hdev = NULL;
2244 struct ib_pd *pd;
2245 kib_net_t *net;
2246 struct sockaddr_in addr;
2247 unsigned long flags;
2248 int rc = 0;
2249 int i;
2250
2251 LASSERT(*kiblnd_tunables.kib_dev_failover > 1 ||
2252 dev->ibd_can_failover ||
2253 dev->ibd_hdev == NULL);
2254
2255 rc = kiblnd_dev_need_failover(dev);
2256 if (rc <= 0)
2257 goto out;
2258
2259 if (dev->ibd_hdev != NULL &&
2260 dev->ibd_hdev->ibh_cmid != NULL) {
2261 /* XXX it's not good to close old listener at here,
2262 * because we can fail to create new listener.
2263 * But we have to close it now, otherwise rdma_bind_addr
2264 * will return EADDRINUSE... How crap! */
2265 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2266
2267 cmid = dev->ibd_hdev->ibh_cmid;
2268 /* make next schedule of kiblnd_dev_need_failover()
2269 * return 1 for me */
2270 dev->ibd_hdev->ibh_cmid = NULL;
2271 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2272
2273 rdma_destroy_id(cmid);
2274 }
2275
2276 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, dev, RDMA_PS_TCP,
2277 IB_QPT_RC);
2278 if (IS_ERR(cmid)) {
2279 rc = PTR_ERR(cmid);
2280 CERROR("Failed to create cmid for failover: %d\n", rc);
2281 goto out;
2282 }
2283
2284 memset(&addr, 0, sizeof(addr));
2285 addr.sin_family = AF_INET;
2286 addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2287 addr.sin_port = htons(*kiblnd_tunables.kib_service);
2288
2289 /* Bind to failover device or port */
2290 rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
2291 if (rc != 0 || cmid->device == NULL) {
2292 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2293 dev->ibd_ifname, &dev->ibd_ifip,
2294 cmid->device, rc);
2295 rdma_destroy_id(cmid);
2296 goto out;
2297 }
2298
2299 LIBCFS_ALLOC(hdev, sizeof(*hdev));
2300 if (hdev == NULL) {
2301 CERROR("Failed to allocate kib_hca_dev\n");
2302 rdma_destroy_id(cmid);
2303 rc = -ENOMEM;
2304 goto out;
2305 }
2306
2307 atomic_set(&hdev->ibh_ref, 1);
2308 hdev->ibh_dev = dev;
2309 hdev->ibh_cmid = cmid;
2310 hdev->ibh_ibdev = cmid->device;
2311
2312 pd = ib_alloc_pd(cmid->device);
2313 if (IS_ERR(pd)) {
2314 rc = PTR_ERR(pd);
2315 CERROR("Can't allocate PD: %d\n", rc);
2316 goto out;
2317 }
2318
2319 hdev->ibh_pd = pd;
2320
2321 rc = rdma_listen(cmid, 0);
2322 if (rc != 0) {
2323 CERROR("Can't start new listener: %d\n", rc);
2324 goto out;
2325 }
2326
2327 rc = kiblnd_hdev_setup_mrs(hdev);
2328 if (rc != 0) {
2329 CERROR("Can't setup device: %d\n", rc);
2330 goto out;
2331 }
2332
2333 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2334
2335 swap(dev->ibd_hdev, hdev); /* take over the refcount */
2336
2337 list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
2338 cfs_cpt_for_each(i, lnet_cpt_table()) {
2339 kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
2340 &zombie_tpo);
2341
2342 if (net->ibn_fmr_ps)
2343 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
2344 &zombie_fpo);
2345 }
2346 }
2347
2348 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2349 out:
2350 if (!list_empty(&zombie_tpo))
2351 kiblnd_destroy_pool_list(&zombie_tpo);
2352 if (!list_empty(&zombie_ppo))
2353 kiblnd_destroy_pool_list(&zombie_ppo);
2354 if (!list_empty(&zombie_fpo))
2355 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
2356 if (hdev != NULL)
2357 kiblnd_hdev_decref(hdev);
2358
2359 if (rc != 0)
2360 dev->ibd_failed_failover++;
2361 else
2362 dev->ibd_failed_failover = 0;
2363
2364 return rc;
2365 }
2366
2367 void kiblnd_destroy_dev(kib_dev_t *dev)
2368 {
2369 LASSERT(dev->ibd_nnets == 0);
2370 LASSERT(list_empty(&dev->ibd_nets));
2371
2372 list_del(&dev->ibd_fail_list);
2373 list_del(&dev->ibd_list);
2374
2375 if (dev->ibd_hdev != NULL)
2376 kiblnd_hdev_decref(dev->ibd_hdev);
2377
2378 LIBCFS_FREE(dev, sizeof(*dev));
2379 }
2380
2381 static kib_dev_t *kiblnd_create_dev(char *ifname)
2382 {
2383 struct net_device *netdev;
2384 kib_dev_t *dev;
2385 __u32 netmask;
2386 __u32 ip;
2387 int up;
2388 int rc;
2389
2390 rc = lnet_ipif_query(ifname, &up, &ip, &netmask);
2391 if (rc != 0) {
2392 CERROR("Can't query IPoIB interface %s: %d\n",
2393 ifname, rc);
2394 return NULL;
2395 }
2396
2397 if (!up) {
2398 CERROR("Can't query IPoIB interface %s: it's down\n", ifname);
2399 return NULL;
2400 }
2401
2402 LIBCFS_ALLOC(dev, sizeof(*dev));
2403 if (dev == NULL)
2404 return NULL;
2405
2406 netdev = dev_get_by_name(&init_net, ifname);
2407 if (netdev == NULL) {
2408 dev->ibd_can_failover = 0;
2409 } else {
2410 dev->ibd_can_failover = !!(netdev->flags & IFF_MASTER);
2411 dev_put(netdev);
2412 }
2413
2414 INIT_LIST_HEAD(&dev->ibd_nets);
2415 INIT_LIST_HEAD(&dev->ibd_list); /* not yet in kib_devs */
2416 INIT_LIST_HEAD(&dev->ibd_fail_list);
2417 dev->ibd_ifip = ip;
2418 strcpy(&dev->ibd_ifname[0], ifname);
2419
2420 /* initialize the device */
2421 rc = kiblnd_dev_failover(dev);
2422 if (rc != 0) {
2423 CERROR("Can't initialize device: %d\n", rc);
2424 LIBCFS_FREE(dev, sizeof(*dev));
2425 return NULL;
2426 }
2427
2428 list_add_tail(&dev->ibd_list,
2429 &kiblnd_data.kib_devs);
2430 return dev;
2431 }
2432
2433 static void kiblnd_base_shutdown(void)
2434 {
2435 struct kib_sched_info *sched;
2436 int i;
2437
2438 LASSERT(list_empty(&kiblnd_data.kib_devs));
2439
2440 switch (kiblnd_data.kib_init) {
2441 default:
2442 LBUG();
2443
2444 case IBLND_INIT_ALL:
2445 case IBLND_INIT_DATA:
2446 LASSERT(kiblnd_data.kib_peers != NULL);
2447 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
2448 LASSERT(list_empty(&kiblnd_data.kib_peers[i]));
2449 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
2450 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
2451
2452 /* flag threads to terminate; wake and wait for them to die */
2453 kiblnd_data.kib_shutdown = 1;
2454
2455 /* NB: we really want to stop scheduler threads net by net
2456 * instead of the whole module, this should be improved
2457 * with dynamic configuration LNet */
2458 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
2459 wake_up_all(&sched->ibs_waitq);
2460
2461 wake_up_all(&kiblnd_data.kib_connd_waitq);
2462 wake_up_all(&kiblnd_data.kib_failover_waitq);
2463
2464 i = 2;
2465 while (atomic_read(&kiblnd_data.kib_nthreads) != 0) {
2466 i++;
2467 /* power of 2 ? */
2468 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
2469 "Waiting for %d threads to terminate\n",
2470 atomic_read(&kiblnd_data.kib_nthreads));
2471 set_current_state(TASK_UNINTERRUPTIBLE);
2472 schedule_timeout(cfs_time_seconds(1));
2473 }
2474
2475 /* fall through */
2476
2477 case IBLND_INIT_NOTHING:
2478 break;
2479 }
2480
2481 if (kiblnd_data.kib_peers != NULL) {
2482 LIBCFS_FREE(kiblnd_data.kib_peers,
2483 sizeof(struct list_head) *
2484 kiblnd_data.kib_peer_hash_size);
2485 }
2486
2487 if (kiblnd_data.kib_scheds != NULL)
2488 cfs_percpt_free(kiblnd_data.kib_scheds);
2489
2490 kiblnd_data.kib_init = IBLND_INIT_NOTHING;
2491 module_put(THIS_MODULE);
2492 }
2493
2494 void kiblnd_shutdown(lnet_ni_t *ni)
2495 {
2496 kib_net_t *net = ni->ni_data;
2497 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2498 int i;
2499 unsigned long flags;
2500
2501 LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
2502
2503 if (net == NULL)
2504 goto out;
2505
2506 write_lock_irqsave(g_lock, flags);
2507 net->ibn_shutdown = 1;
2508 write_unlock_irqrestore(g_lock, flags);
2509
2510 switch (net->ibn_init) {
2511 default:
2512 LBUG();
2513
2514 case IBLND_INIT_ALL:
2515 /* nuke all existing peers within this net */
2516 kiblnd_del_peer(ni, LNET_NID_ANY);
2517
2518 /* Wait for all peer state to clean up */
2519 i = 2;
2520 while (atomic_read(&net->ibn_npeers) != 0) {
2521 i++;
2522 CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, /* 2**n? */
2523 "%s: waiting for %d peers to disconnect\n",
2524 libcfs_nid2str(ni->ni_nid),
2525 atomic_read(&net->ibn_npeers));
2526 set_current_state(TASK_UNINTERRUPTIBLE);
2527 schedule_timeout(cfs_time_seconds(1));
2528 }
2529
2530 kiblnd_net_fini_pools(net);
2531
2532 write_lock_irqsave(g_lock, flags);
2533 LASSERT(net->ibn_dev->ibd_nnets > 0);
2534 net->ibn_dev->ibd_nnets--;
2535 list_del(&net->ibn_list);
2536 write_unlock_irqrestore(g_lock, flags);
2537
2538 /* fall through */
2539
2540 case IBLND_INIT_NOTHING:
2541 LASSERT(atomic_read(&net->ibn_nconns) == 0);
2542
2543 if (net->ibn_dev != NULL &&
2544 net->ibn_dev->ibd_nnets == 0)
2545 kiblnd_destroy_dev(net->ibn_dev);
2546
2547 break;
2548 }
2549
2550 net->ibn_init = IBLND_INIT_NOTHING;
2551 ni->ni_data = NULL;
2552
2553 LIBCFS_FREE(net, sizeof(*net));
2554
2555 out:
2556 if (list_empty(&kiblnd_data.kib_devs))
2557 kiblnd_base_shutdown();
2558 }
2559
2560 static int kiblnd_base_startup(void)
2561 {
2562 struct kib_sched_info *sched;
2563 int rc;
2564 int i;
2565
2566 LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
2567
2568 try_module_get(THIS_MODULE);
2569 /* zero pointers, flags etc */
2570 memset(&kiblnd_data, 0, sizeof(kiblnd_data));
2571
2572 rwlock_init(&kiblnd_data.kib_global_lock);
2573
2574 INIT_LIST_HEAD(&kiblnd_data.kib_devs);
2575 INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
2576
2577 kiblnd_data.kib_peer_hash_size = IBLND_PEER_HASH_SIZE;
2578 LIBCFS_ALLOC(kiblnd_data.kib_peers,
2579 sizeof(struct list_head) * kiblnd_data.kib_peer_hash_size);
2580 if (kiblnd_data.kib_peers == NULL)
2581 goto failed;
2582 for (i = 0; i < kiblnd_data.kib_peer_hash_size; i++)
2583 INIT_LIST_HEAD(&kiblnd_data.kib_peers[i]);
2584
2585 spin_lock_init(&kiblnd_data.kib_connd_lock);
2586 INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
2587 INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
2588 init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
2589 init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
2590
2591 kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
2592 sizeof(*sched));
2593 if (kiblnd_data.kib_scheds == NULL)
2594 goto failed;
2595
2596 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
2597 int nthrs;
2598
2599 spin_lock_init(&sched->ibs_lock);
2600 INIT_LIST_HEAD(&sched->ibs_conns);
2601 init_waitqueue_head(&sched->ibs_waitq);
2602
2603 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
2604 if (*kiblnd_tunables.kib_nscheds > 0) {
2605 nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
2606 } else {
2607 /* max to half of CPUs, another half is reserved for
2608 * upper layer modules */
2609 nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
2610 }
2611
2612 sched->ibs_nthreads_max = nthrs;
2613 sched->ibs_cpt = i;
2614 }
2615
2616 kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
2617
2618 /* lists/ptrs/locks initialised */
2619 kiblnd_data.kib_init = IBLND_INIT_DATA;
2620 /*****************************************************/
2621
2622 rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
2623 if (rc != 0) {
2624 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
2625 goto failed;
2626 }
2627
2628 if (*kiblnd_tunables.kib_dev_failover != 0)
2629 rc = kiblnd_thread_start(kiblnd_failover_thread, NULL,
2630 "kiblnd_failover");
2631
2632 if (rc != 0) {
2633 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
2634 goto failed;
2635 }
2636
2637 /* flag everything initialised */
2638 kiblnd_data.kib_init = IBLND_INIT_ALL;
2639 /*****************************************************/
2640
2641 return 0;
2642
2643 failed:
2644 kiblnd_base_shutdown();
2645 return -ENETDOWN;
2646 }
2647
2648 static int kiblnd_start_schedulers(struct kib_sched_info *sched)
2649 {
2650 int rc = 0;
2651 int nthrs;
2652 int i;
2653
2654 if (sched->ibs_nthreads == 0) {
2655 if (*kiblnd_tunables.kib_nscheds > 0) {
2656 nthrs = sched->ibs_nthreads_max;
2657 } else {
2658 nthrs = cfs_cpt_weight(lnet_cpt_table(),
2659 sched->ibs_cpt);
2660 nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
2661 nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
2662 }
2663 } else {
2664 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
2665 /* increase one thread if there is new interface */
2666 nthrs = sched->ibs_nthreads < sched->ibs_nthreads_max;
2667 }
2668
2669 for (i = 0; i < nthrs; i++) {
2670 long id;
2671 char name[20];
2672
2673 id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
2674 snprintf(name, sizeof(name), "kiblnd_sd_%02ld_%02ld",
2675 KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
2676 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id, name);
2677 if (rc == 0)
2678 continue;
2679
2680 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
2681 sched->ibs_cpt, sched->ibs_nthreads + i, rc);
2682 break;
2683 }
2684
2685 sched->ibs_nthreads += i;
2686 return rc;
2687 }
2688
2689 static int kiblnd_dev_start_threads(kib_dev_t *dev, int newdev, __u32 *cpts,
2690 int ncpts)
2691 {
2692 int cpt;
2693 int rc;
2694 int i;
2695
2696 for (i = 0; i < ncpts; i++) {
2697 struct kib_sched_info *sched;
2698
2699 cpt = (cpts == NULL) ? i : cpts[i];
2700 sched = kiblnd_data.kib_scheds[cpt];
2701
2702 if (!newdev && sched->ibs_nthreads > 0)
2703 continue;
2704
2705 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
2706 if (rc != 0) {
2707 CERROR("Failed to start scheduler threads for %s\n",
2708 dev->ibd_ifname);
2709 return rc;
2710 }
2711 }
2712 return 0;
2713 }
2714
2715 static kib_dev_t *kiblnd_dev_search(char *ifname)
2716 {
2717 kib_dev_t *alias = NULL;
2718 kib_dev_t *dev;
2719 char *colon;
2720 char *colon2;
2721
2722 colon = strchr(ifname, ':');
2723 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
2724 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
2725 return dev;
2726
2727 if (alias != NULL)
2728 continue;
2729
2730 colon2 = strchr(dev->ibd_ifname, ':');
2731 if (colon != NULL)
2732 *colon = 0;
2733 if (colon2 != NULL)
2734 *colon2 = 0;
2735
2736 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
2737 alias = dev;
2738
2739 if (colon != NULL)
2740 *colon = ':';
2741 if (colon2 != NULL)
2742 *colon2 = ':';
2743 }
2744 return alias;
2745 }
2746
2747 int kiblnd_startup(lnet_ni_t *ni)
2748 {
2749 char *ifname;
2750 kib_dev_t *ibdev = NULL;
2751 kib_net_t *net;
2752 struct timespec64 tv;
2753 unsigned long flags;
2754 int rc;
2755 int newdev;
2756
2757 LASSERT(ni->ni_lnd == &the_o2iblnd);
2758
2759 if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
2760 rc = kiblnd_base_startup();
2761 if (rc != 0)
2762 return rc;
2763 }
2764
2765 LIBCFS_ALLOC(net, sizeof(*net));
2766 ni->ni_data = net;
2767 if (net == NULL)
2768 goto net_failed;
2769
2770 ktime_get_real_ts64(&tv);
2771 net->ibn_incarnation = tv.tv_sec * USEC_PER_SEC +
2772 tv.tv_nsec / NSEC_PER_USEC;
2773
2774 ni->ni_peertimeout = *kiblnd_tunables.kib_peertimeout;
2775 ni->ni_maxtxcredits = *kiblnd_tunables.kib_credits;
2776 ni->ni_peertxcredits = *kiblnd_tunables.kib_peertxcredits;
2777 ni->ni_peerrtrcredits = *kiblnd_tunables.kib_peerrtrcredits;
2778
2779 if (ni->ni_interfaces[0] != NULL) {
2780 /* Use the IPoIB interface specified in 'networks=' */
2781
2782 CLASSERT(LNET_MAX_INTERFACES > 1);
2783 if (ni->ni_interfaces[1] != NULL) {
2784 CERROR("Multiple interfaces not supported\n");
2785 goto failed;
2786 }
2787
2788 ifname = ni->ni_interfaces[0];
2789 } else {
2790 ifname = *kiblnd_tunables.kib_default_ipif;
2791 }
2792
2793 if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
2794 CERROR("IPoIB interface name too long: %s\n", ifname);
2795 goto failed;
2796 }
2797
2798 ibdev = kiblnd_dev_search(ifname);
2799
2800 newdev = ibdev == NULL;
2801 /* hmm...create kib_dev even for alias */
2802 if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0)
2803 ibdev = kiblnd_create_dev(ifname);
2804
2805 if (ibdev == NULL)
2806 goto failed;
2807
2808 net->ibn_dev = ibdev;
2809 ni->ni_nid = LNET_MKNID(LNET_NIDNET(ni->ni_nid), ibdev->ibd_ifip);
2810
2811 rc = kiblnd_dev_start_threads(ibdev, newdev,
2812 ni->ni_cpts, ni->ni_ncpts);
2813 if (rc != 0)
2814 goto failed;
2815
2816 rc = kiblnd_net_init_pools(net, ni->ni_cpts, ni->ni_ncpts);
2817 if (rc != 0) {
2818 CERROR("Failed to initialize NI pools: %d\n", rc);
2819 goto failed;
2820 }
2821
2822 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2823 ibdev->ibd_nnets++;
2824 list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
2825 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2826
2827 net->ibn_init = IBLND_INIT_ALL;
2828
2829 return 0;
2830
2831 failed:
2832 if (net->ibn_dev == NULL && ibdev != NULL)
2833 kiblnd_destroy_dev(ibdev);
2834
2835 net_failed:
2836 kiblnd_shutdown(ni);
2837
2838 CDEBUG(D_NET, "kiblnd_startup failed\n");
2839 return -ENETDOWN;
2840 }
2841
2842 static void __exit kiblnd_module_fini(void)
2843 {
2844 lnet_unregister_lnd(&the_o2iblnd);
2845 }
2846
2847 static int __init kiblnd_module_init(void)
2848 {
2849 int rc;
2850
2851 CLASSERT(sizeof(kib_msg_t) <= IBLND_MSG_SIZE);
2852 CLASSERT(offsetof(kib_msg_t,
2853 ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2854 <= IBLND_MSG_SIZE);
2855 CLASSERT(offsetof(kib_msg_t,
2856 ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS])
2857 <= IBLND_MSG_SIZE);
2858
2859 rc = kiblnd_tunables_init();
2860 if (rc != 0)
2861 return rc;
2862
2863 lnet_register_lnd(&the_o2iblnd);
2864
2865 return 0;
2866 }
2867
2868 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
2869 MODULE_DESCRIPTION("Kernel OpenIB gen2 LND v2.00");
2870 MODULE_LICENSE("GPL");
2871
2872 module_init(kiblnd_module_init);
2873 module_exit(kiblnd_module_fini);
Linux kernel - Deliverables
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