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staging: lustre: lnet: o2iblnd: Use list_for_each_entry_safe
[deliverable/linux.git] / drivers / staging / lustre / lnet / klnds / o2iblnd / o2iblnd_cb.c
1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2012, 2015, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 *
36 * lnet/klnds/o2iblnd/o2iblnd_cb.c
37 *
38 * Author: Eric Barton <eric@bartonsoftware.com>
39 */
40
41 #include "o2iblnd.h"
42
43 static void kiblnd_peer_alive(kib_peer_t *peer);
44 static void kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error);
45 static void kiblnd_check_sends(kib_conn_t *conn);
46 static void kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx,
47 int type, int body_nob);
48 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
49 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
50 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
51 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
52 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
53
54 static void
55 kiblnd_tx_done(lnet_ni_t *ni, kib_tx_t *tx)
56 {
57 lnet_msg_t *lntmsg[2];
58 kib_net_t *net = ni->ni_data;
59 int rc;
60 int i;
61
62 LASSERT(net);
63 LASSERT(!in_interrupt());
64 LASSERT(!tx->tx_queued); /* mustn't be queued for sending */
65 LASSERT(!tx->tx_sending); /* mustn't be awaiting sent callback */
66 LASSERT(!tx->tx_waiting); /* mustn't be awaiting peer response */
67 LASSERT(tx->tx_pool);
68
69 kiblnd_unmap_tx(ni, tx);
70
71 /* tx may have up to 2 lnet msgs to finalise */
72 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
73 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
74 rc = tx->tx_status;
75
76 if (tx->tx_conn) {
77 LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
78
79 kiblnd_conn_decref(tx->tx_conn);
80 tx->tx_conn = NULL;
81 }
82
83 tx->tx_nwrq = 0;
84 tx->tx_status = 0;
85
86 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
87
88 /* delay finalize until my descs have been freed */
89 for (i = 0; i < 2; i++) {
90 if (!lntmsg[i])
91 continue;
92
93 lnet_finalize(ni, lntmsg[i], rc);
94 }
95 }
96
97 void
98 kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
99 {
100 kib_tx_t *tx;
101
102 while (!list_empty(txlist)) {
103 tx = list_entry(txlist->next, kib_tx_t, tx_list);
104
105 list_del(&tx->tx_list);
106 /* complete now */
107 tx->tx_waiting = 0;
108 tx->tx_status = status;
109 kiblnd_tx_done(ni, tx);
110 }
111 }
112
113 static kib_tx_t *
114 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
115 {
116 kib_net_t *net = (kib_net_t *)ni->ni_data;
117 struct list_head *node;
118 kib_tx_t *tx;
119 kib_tx_poolset_t *tps;
120
121 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
122 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
123 if (!node)
124 return NULL;
125 tx = list_entry(node, kib_tx_t, tx_list);
126
127 LASSERT(!tx->tx_nwrq);
128 LASSERT(!tx->tx_queued);
129 LASSERT(!tx->tx_sending);
130 LASSERT(!tx->tx_waiting);
131 LASSERT(!tx->tx_status);
132 LASSERT(!tx->tx_conn);
133 LASSERT(!tx->tx_lntmsg[0]);
134 LASSERT(!tx->tx_lntmsg[1]);
135 LASSERT(!tx->tx_nfrags);
136
137 return tx;
138 }
139
140 static void
141 kiblnd_drop_rx(kib_rx_t *rx)
142 {
143 kib_conn_t *conn = rx->rx_conn;
144 struct kib_sched_info *sched = conn->ibc_sched;
145 unsigned long flags;
146
147 spin_lock_irqsave(&sched->ibs_lock, flags);
148 LASSERT(conn->ibc_nrx > 0);
149 conn->ibc_nrx--;
150 spin_unlock_irqrestore(&sched->ibs_lock, flags);
151
152 kiblnd_conn_decref(conn);
153 }
154
155 int
156 kiblnd_post_rx(kib_rx_t *rx, int credit)
157 {
158 kib_conn_t *conn = rx->rx_conn;
159 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
160 struct ib_recv_wr *bad_wrq = NULL;
161 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
162 int rc;
163
164 LASSERT(net);
165 LASSERT(!in_interrupt());
166 LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
167 credit == IBLND_POSTRX_PEER_CREDIT ||
168 credit == IBLND_POSTRX_RSRVD_CREDIT);
169 LASSERT(mr);
170
171 rx->rx_sge.lkey = mr->lkey;
172 rx->rx_sge.addr = rx->rx_msgaddr;
173 rx->rx_sge.length = IBLND_MSG_SIZE;
174
175 rx->rx_wrq.next = NULL;
176 rx->rx_wrq.sg_list = &rx->rx_sge;
177 rx->rx_wrq.num_sge = 1;
178 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
179
180 LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
181 LASSERT(rx->rx_nob >= 0); /* not posted */
182
183 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
184 kiblnd_drop_rx(rx); /* No more posts for this rx */
185 return 0;
186 }
187
188 rx->rx_nob = -1; /* flag posted */
189
190 /* NB: need an extra reference after ib_post_recv because we don't
191 * own this rx (and rx::rx_conn) anymore, LU-5678.
192 */
193 kiblnd_conn_addref(conn);
194 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
195 if (unlikely(rc)) {
196 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
197 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
198 rx->rx_nob = 0;
199 }
200
201 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
202 goto out;
203
204 if (unlikely(rc)) {
205 kiblnd_close_conn(conn, rc);
206 kiblnd_drop_rx(rx); /* No more posts for this rx */
207 goto out;
208 }
209
210 if (credit == IBLND_POSTRX_NO_CREDIT)
211 goto out;
212
213 spin_lock(&conn->ibc_lock);
214 if (credit == IBLND_POSTRX_PEER_CREDIT)
215 conn->ibc_outstanding_credits++;
216 else
217 conn->ibc_reserved_credits++;
218 spin_unlock(&conn->ibc_lock);
219
220 kiblnd_check_sends(conn);
221 out:
222 kiblnd_conn_decref(conn);
223 return rc;
224 }
225
226 static kib_tx_t *
227 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
228 {
229 struct list_head *tmp;
230
231 list_for_each(tmp, &conn->ibc_active_txs) {
232 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
233
234 LASSERT(!tx->tx_queued);
235 LASSERT(tx->tx_sending || tx->tx_waiting);
236
237 if (tx->tx_cookie != cookie)
238 continue;
239
240 if (tx->tx_waiting &&
241 tx->tx_msg->ibm_type == txtype)
242 return tx;
243
244 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
245 tx->tx_waiting ? "" : "NOT ",
246 tx->tx_msg->ibm_type, txtype);
247 }
248 return NULL;
249 }
250
251 static void
252 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
253 {
254 kib_tx_t *tx;
255 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
256 int idle;
257
258 spin_lock(&conn->ibc_lock);
259
260 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
261 if (!tx) {
262 spin_unlock(&conn->ibc_lock);
263
264 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
265 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
266 kiblnd_close_conn(conn, -EPROTO);
267 return;
268 }
269
270 if (!tx->tx_status) { /* success so far */
271 if (status < 0) /* failed? */
272 tx->tx_status = status;
273 else if (txtype == IBLND_MSG_GET_REQ)
274 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
275 }
276
277 tx->tx_waiting = 0;
278
279 idle = !tx->tx_queued && !tx->tx_sending;
280 if (idle)
281 list_del(&tx->tx_list);
282
283 spin_unlock(&conn->ibc_lock);
284
285 if (idle)
286 kiblnd_tx_done(ni, tx);
287 }
288
289 static void
290 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
291 {
292 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
293 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
294
295 if (!tx) {
296 CERROR("Can't get tx for completion %x for %s\n",
297 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
298 return;
299 }
300
301 tx->tx_msg->ibm_u.completion.ibcm_status = status;
302 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
303 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
304
305 kiblnd_queue_tx(tx, conn);
306 }
307
308 static void
309 kiblnd_handle_rx(kib_rx_t *rx)
310 {
311 kib_msg_t *msg = rx->rx_msg;
312 kib_conn_t *conn = rx->rx_conn;
313 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
314 int credits = msg->ibm_credits;
315 kib_tx_t *tx;
316 int rc = 0;
317 int rc2;
318 int post_credit;
319
320 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
321
322 CDEBUG(D_NET, "Received %x[%d] from %s\n",
323 msg->ibm_type, credits,
324 libcfs_nid2str(conn->ibc_peer->ibp_nid));
325
326 if (credits) {
327 /* Have I received credits that will let me send? */
328 spin_lock(&conn->ibc_lock);
329
330 if (conn->ibc_credits + credits >
331 conn->ibc_queue_depth) {
332 rc2 = conn->ibc_credits;
333 spin_unlock(&conn->ibc_lock);
334
335 CERROR("Bad credits from %s: %d + %d > %d\n",
336 libcfs_nid2str(conn->ibc_peer->ibp_nid),
337 rc2, credits, conn->ibc_queue_depth);
338
339 kiblnd_close_conn(conn, -EPROTO);
340 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
341 return;
342 }
343
344 conn->ibc_credits += credits;
345
346 /* This ensures the credit taken by NOOP can be returned */
347 if (msg->ibm_type == IBLND_MSG_NOOP &&
348 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
349 conn->ibc_outstanding_credits++;
350
351 spin_unlock(&conn->ibc_lock);
352 kiblnd_check_sends(conn);
353 }
354
355 switch (msg->ibm_type) {
356 default:
357 CERROR("Bad IBLND message type %x from %s\n",
358 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
359 post_credit = IBLND_POSTRX_NO_CREDIT;
360 rc = -EPROTO;
361 break;
362
363 case IBLND_MSG_NOOP:
364 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
365 post_credit = IBLND_POSTRX_NO_CREDIT;
366 break;
367 }
368
369 if (credits) /* credit already posted */
370 post_credit = IBLND_POSTRX_NO_CREDIT;
371 else /* a keepalive NOOP */
372 post_credit = IBLND_POSTRX_PEER_CREDIT;
373 break;
374
375 case IBLND_MSG_IMMEDIATE:
376 post_credit = IBLND_POSTRX_DONT_POST;
377 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
378 msg->ibm_srcnid, rx, 0);
379 if (rc < 0) /* repost on error */
380 post_credit = IBLND_POSTRX_PEER_CREDIT;
381 break;
382
383 case IBLND_MSG_PUT_REQ:
384 post_credit = IBLND_POSTRX_DONT_POST;
385 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
386 msg->ibm_srcnid, rx, 1);
387 if (rc < 0) /* repost on error */
388 post_credit = IBLND_POSTRX_PEER_CREDIT;
389 break;
390
391 case IBLND_MSG_PUT_NAK:
392 CWARN("PUT_NACK from %s\n",
393 libcfs_nid2str(conn->ibc_peer->ibp_nid));
394 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
395 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
396 msg->ibm_u.completion.ibcm_status,
397 msg->ibm_u.completion.ibcm_cookie);
398 break;
399
400 case IBLND_MSG_PUT_ACK:
401 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
402
403 spin_lock(&conn->ibc_lock);
404 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
405 msg->ibm_u.putack.ibpam_src_cookie);
406 if (tx)
407 list_del(&tx->tx_list);
408 spin_unlock(&conn->ibc_lock);
409
410 if (!tx) {
411 CERROR("Unmatched PUT_ACK from %s\n",
412 libcfs_nid2str(conn->ibc_peer->ibp_nid));
413 rc = -EPROTO;
414 break;
415 }
416
417 LASSERT(tx->tx_waiting);
418 /*
419 * CAVEAT EMPTOR: I could be racing with tx_complete, but...
420 * (a) I can overwrite tx_msg since my peer has received it!
421 * (b) tx_waiting set tells tx_complete() it's not done.
422 */
423 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
424
425 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
426 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
427 &msg->ibm_u.putack.ibpam_rd,
428 msg->ibm_u.putack.ibpam_dst_cookie);
429 if (rc2 < 0)
430 CERROR("Can't setup rdma for PUT to %s: %d\n",
431 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
432
433 spin_lock(&conn->ibc_lock);
434 tx->tx_waiting = 0; /* clear waiting and queue atomically */
435 kiblnd_queue_tx_locked(tx, conn);
436 spin_unlock(&conn->ibc_lock);
437 break;
438
439 case IBLND_MSG_PUT_DONE:
440 post_credit = IBLND_POSTRX_PEER_CREDIT;
441 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
442 msg->ibm_u.completion.ibcm_status,
443 msg->ibm_u.completion.ibcm_cookie);
444 break;
445
446 case IBLND_MSG_GET_REQ:
447 post_credit = IBLND_POSTRX_DONT_POST;
448 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
449 msg->ibm_srcnid, rx, 1);
450 if (rc < 0) /* repost on error */
451 post_credit = IBLND_POSTRX_PEER_CREDIT;
452 break;
453
454 case IBLND_MSG_GET_DONE:
455 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
456 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
457 msg->ibm_u.completion.ibcm_status,
458 msg->ibm_u.completion.ibcm_cookie);
459 break;
460 }
461
462 if (rc < 0) /* protocol error */
463 kiblnd_close_conn(conn, rc);
464
465 if (post_credit != IBLND_POSTRX_DONT_POST)
466 kiblnd_post_rx(rx, post_credit);
467 }
468
469 static void
470 kiblnd_rx_complete(kib_rx_t *rx, int status, int nob)
471 {
472 kib_msg_t *msg = rx->rx_msg;
473 kib_conn_t *conn = rx->rx_conn;
474 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
475 kib_net_t *net = ni->ni_data;
476 int rc;
477 int err = -EIO;
478
479 LASSERT(net);
480 LASSERT(rx->rx_nob < 0); /* was posted */
481 rx->rx_nob = 0; /* isn't now */
482
483 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
484 goto ignore;
485
486 if (status != IB_WC_SUCCESS) {
487 CNETERR("Rx from %s failed: %d\n",
488 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
489 goto failed;
490 }
491
492 LASSERT(nob >= 0);
493 rx->rx_nob = nob;
494
495 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
496 if (rc) {
497 CERROR("Error %d unpacking rx from %s\n",
498 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
499 goto failed;
500 }
501
502 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
503 msg->ibm_dstnid != ni->ni_nid ||
504 msg->ibm_srcstamp != conn->ibc_incarnation ||
505 msg->ibm_dststamp != net->ibn_incarnation) {
506 CERROR("Stale rx from %s\n",
507 libcfs_nid2str(conn->ibc_peer->ibp_nid));
508 err = -ESTALE;
509 goto failed;
510 }
511
512 /* set time last known alive */
513 kiblnd_peer_alive(conn->ibc_peer);
514
515 /* racing with connection establishment/teardown! */
516
517 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
518 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
519 unsigned long flags;
520
521 write_lock_irqsave(g_lock, flags);
522 /* must check holding global lock to eliminate race */
523 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
524 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
525 write_unlock_irqrestore(g_lock, flags);
526 return;
527 }
528 write_unlock_irqrestore(g_lock, flags);
529 }
530 kiblnd_handle_rx(rx);
531 return;
532
533 failed:
534 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
535 kiblnd_close_conn(conn, err);
536 ignore:
537 kiblnd_drop_rx(rx); /* Don't re-post rx. */
538 }
539
540 static struct page *
541 kiblnd_kvaddr_to_page(unsigned long vaddr)
542 {
543 struct page *page;
544
545 if (is_vmalloc_addr((void *)vaddr)) {
546 page = vmalloc_to_page((void *)vaddr);
547 LASSERT(page);
548 return page;
549 }
550 #ifdef CONFIG_HIGHMEM
551 if (vaddr >= PKMAP_BASE &&
552 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
553 /* No highmem pages only used for bulk (kiov) I/O */
554 CERROR("find page for address in highmem\n");
555 LBUG();
556 }
557 #endif
558 page = virt_to_page(vaddr);
559 LASSERT(page);
560 return page;
561 }
562
563 static int
564 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
565 {
566 kib_hca_dev_t *hdev;
567 __u64 *pages = tx->tx_pages;
568 kib_fmr_poolset_t *fps;
569 int npages;
570 int size;
571 int cpt;
572 int rc;
573 int i;
574
575 LASSERT(tx->tx_pool);
576 LASSERT(tx->tx_pool->tpo_pool.po_owner);
577
578 hdev = tx->tx_pool->tpo_hdev;
579
580 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
581 for (size = 0; size < rd->rd_frags[i].rf_nob;
582 size += hdev->ibh_page_size) {
583 pages[npages++] = (rd->rd_frags[i].rf_addr &
584 hdev->ibh_page_mask) + size;
585 }
586 }
587
588 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
589
590 fps = net->ibn_fmr_ps[cpt];
591 rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->fmr);
592 if (rc) {
593 CERROR("Can't map %d pages: %d\n", npages, rc);
594 return rc;
595 }
596
597 /*
598 * If rd is not tx_rd, it's going to get sent to a peer, who will need
599 * the rkey
600 */
601 rd->rd_key = (rd != tx->tx_rd) ? tx->fmr.fmr_pfmr->fmr->rkey :
602 tx->fmr.fmr_pfmr->fmr->lkey;
603 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
604 rd->rd_frags[0].rf_nob = nob;
605 rd->rd_nfrags = 1;
606
607 return 0;
608 }
609
610 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
611 {
612 kib_net_t *net = ni->ni_data;
613
614 LASSERT(net);
615
616 if (net->ibn_fmr_ps && tx->fmr.fmr_pfmr) {
617 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
618 tx->fmr.fmr_pfmr = NULL;
619 }
620
621 if (tx->tx_nfrags) {
622 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
623 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
624 tx->tx_nfrags = 0;
625 }
626 }
627
628 static int kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
629 int nfrags)
630 {
631 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
632 kib_net_t *net = ni->ni_data;
633 struct ib_mr *mr = NULL;
634 __u32 nob;
635 int i;
636
637 /*
638 * If rd is not tx_rd, it's going to get sent to a peer and I'm the
639 * RDMA sink
640 */
641 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
642 tx->tx_nfrags = nfrags;
643
644 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
645 tx->tx_nfrags, tx->tx_dmadir);
646
647 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
648 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
649 hdev->ibh_ibdev, &tx->tx_frags[i]);
650 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
651 hdev->ibh_ibdev, &tx->tx_frags[i]);
652 nob += rd->rd_frags[i].rf_nob;
653 }
654
655 mr = kiblnd_find_rd_dma_mr(hdev, rd, tx->tx_conn ?
656 tx->tx_conn->ibc_max_frags : -1);
657 if (mr) {
658 /* found pre-mapping MR */
659 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
660 return 0;
661 }
662
663 if (net->ibn_fmr_ps)
664 return kiblnd_fmr_map_tx(net, tx, rd, nob);
665
666 return -EINVAL;
667 }
668
669 static int
670 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
671 unsigned int niov, struct kvec *iov, int offset, int nob)
672 {
673 kib_net_t *net = ni->ni_data;
674 struct page *page;
675 struct scatterlist *sg;
676 unsigned long vaddr;
677 int fragnob;
678 int page_offset;
679
680 LASSERT(nob > 0);
681 LASSERT(niov > 0);
682 LASSERT(net);
683
684 while (offset >= iov->iov_len) {
685 offset -= iov->iov_len;
686 niov--;
687 iov++;
688 LASSERT(niov > 0);
689 }
690
691 sg = tx->tx_frags;
692 do {
693 LASSERT(niov > 0);
694
695 vaddr = ((unsigned long)iov->iov_base) + offset;
696 page_offset = vaddr & (PAGE_SIZE - 1);
697 page = kiblnd_kvaddr_to_page(vaddr);
698 if (!page) {
699 CERROR("Can't find page\n");
700 return -EFAULT;
701 }
702
703 fragnob = min((int)(iov->iov_len - offset), nob);
704 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
705
706 sg_set_page(sg, page, fragnob, page_offset);
707 sg++;
708
709 if (offset + fragnob < iov->iov_len) {
710 offset += fragnob;
711 } else {
712 offset = 0;
713 iov++;
714 niov--;
715 }
716 nob -= fragnob;
717 } while (nob > 0);
718
719 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
720 }
721
722 static int
723 kiblnd_setup_rd_kiov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
724 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
725 {
726 kib_net_t *net = ni->ni_data;
727 struct scatterlist *sg;
728 int fragnob;
729
730 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
731
732 LASSERT(nob > 0);
733 LASSERT(nkiov > 0);
734 LASSERT(net);
735
736 while (offset >= kiov->kiov_len) {
737 offset -= kiov->kiov_len;
738 nkiov--;
739 kiov++;
740 LASSERT(nkiov > 0);
741 }
742
743 sg = tx->tx_frags;
744 do {
745 LASSERT(nkiov > 0);
746
747 fragnob = min((int)(kiov->kiov_len - offset), nob);
748
749 sg_set_page(sg, kiov->kiov_page, fragnob,
750 kiov->kiov_offset + offset);
751 sg++;
752
753 offset = 0;
754 kiov++;
755 nkiov--;
756 nob -= fragnob;
757 } while (nob > 0);
758
759 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
760 }
761
762 static int
763 kiblnd_post_tx_locked(kib_conn_t *conn, kib_tx_t *tx, int credit)
764 __must_hold(&conn->ibc_lock)
765 {
766 kib_msg_t *msg = tx->tx_msg;
767 kib_peer_t *peer = conn->ibc_peer;
768 int ver = conn->ibc_version;
769 int rc;
770 int done;
771
772 LASSERT(tx->tx_queued);
773 /* We rely on this for QP sizing */
774 LASSERT(tx->tx_nwrq > 0);
775 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
776
777 LASSERT(!credit || credit == 1);
778 LASSERT(conn->ibc_outstanding_credits >= 0);
779 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
780 LASSERT(conn->ibc_credits >= 0);
781 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
782
783 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
784 /* tx completions outstanding... */
785 CDEBUG(D_NET, "%s: posted enough\n",
786 libcfs_nid2str(peer->ibp_nid));
787 return -EAGAIN;
788 }
789
790 if (credit && !conn->ibc_credits) { /* no credits */
791 CDEBUG(D_NET, "%s: no credits\n",
792 libcfs_nid2str(peer->ibp_nid));
793 return -EAGAIN;
794 }
795
796 if (credit && !IBLND_OOB_CAPABLE(ver) &&
797 conn->ibc_credits == 1 && /* last credit reserved */
798 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
799 CDEBUG(D_NET, "%s: not using last credit\n",
800 libcfs_nid2str(peer->ibp_nid));
801 return -EAGAIN;
802 }
803
804 /* NB don't drop ibc_lock before bumping tx_sending */
805 list_del(&tx->tx_list);
806 tx->tx_queued = 0;
807
808 if (msg->ibm_type == IBLND_MSG_NOOP &&
809 (!kiblnd_need_noop(conn) || /* redundant NOOP */
810 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
811 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
812 /*
813 * OK to drop when posted enough NOOPs, since
814 * kiblnd_check_sends will queue NOOP again when
815 * posted NOOPs complete
816 */
817 spin_unlock(&conn->ibc_lock);
818 kiblnd_tx_done(peer->ibp_ni, tx);
819 spin_lock(&conn->ibc_lock);
820 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
821 libcfs_nid2str(peer->ibp_nid),
822 conn->ibc_noops_posted);
823 return 0;
824 }
825
826 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
827 peer->ibp_nid, conn->ibc_incarnation);
828
829 conn->ibc_credits -= credit;
830 conn->ibc_outstanding_credits = 0;
831 conn->ibc_nsends_posted++;
832 if (msg->ibm_type == IBLND_MSG_NOOP)
833 conn->ibc_noops_posted++;
834
835 /*
836 * CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
837 * PUT. If so, it was first queued here as a PUT_REQ, sent and
838 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
839 * and then re-queued here. It's (just) possible that
840 * tx_sending is non-zero if we've not done the tx_complete()
841 * from the first send; hence the ++ rather than = below.
842 */
843 tx->tx_sending++;
844 list_add(&tx->tx_list, &conn->ibc_active_txs);
845
846 /* I'm still holding ibc_lock! */
847 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
848 rc = -ECONNABORTED;
849 } else if (tx->tx_pool->tpo_pool.po_failed ||
850 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
851 /* close_conn will launch failover */
852 rc = -ENETDOWN;
853 } else {
854 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
855
856 LASSERTF(wrq->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
857 "bad wr_id %llx, opc %d, flags %d, peer: %s\n",
858 wrq->wr_id, wrq->opcode, wrq->send_flags,
859 libcfs_nid2str(conn->ibc_peer->ibp_nid));
860 wrq = NULL;
861 rc = ib_post_send(conn->ibc_cmid->qp, &tx->tx_wrq->wr, &wrq);
862 }
863
864 conn->ibc_last_send = jiffies;
865
866 if (!rc)
867 return 0;
868
869 /*
870 * NB credits are transferred in the actual
871 * message, which can only be the last work item
872 */
873 conn->ibc_credits += credit;
874 conn->ibc_outstanding_credits += msg->ibm_credits;
875 conn->ibc_nsends_posted--;
876 if (msg->ibm_type == IBLND_MSG_NOOP)
877 conn->ibc_noops_posted--;
878
879 tx->tx_status = rc;
880 tx->tx_waiting = 0;
881 tx->tx_sending--;
882
883 done = !tx->tx_sending;
884 if (done)
885 list_del(&tx->tx_list);
886
887 spin_unlock(&conn->ibc_lock);
888
889 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
890 CERROR("Error %d posting transmit to %s\n",
891 rc, libcfs_nid2str(peer->ibp_nid));
892 else
893 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
894 rc, libcfs_nid2str(peer->ibp_nid));
895
896 kiblnd_close_conn(conn, rc);
897
898 if (done)
899 kiblnd_tx_done(peer->ibp_ni, tx);
900
901 spin_lock(&conn->ibc_lock);
902
903 return -EIO;
904 }
905
906 static void
907 kiblnd_check_sends(kib_conn_t *conn)
908 {
909 int ver = conn->ibc_version;
910 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
911 kib_tx_t *tx;
912
913 /* Don't send anything until after the connection is established */
914 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
915 CDEBUG(D_NET, "%s too soon\n",
916 libcfs_nid2str(conn->ibc_peer->ibp_nid));
917 return;
918 }
919
920 spin_lock(&conn->ibc_lock);
921
922 LASSERT(conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
923 LASSERT(!IBLND_OOB_CAPABLE(ver) ||
924 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
925 LASSERT(conn->ibc_reserved_credits >= 0);
926
927 while (conn->ibc_reserved_credits > 0 &&
928 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
929 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
930 kib_tx_t, tx_list);
931 list_del(&tx->tx_list);
932 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
933 conn->ibc_reserved_credits--;
934 }
935
936 if (kiblnd_need_noop(conn)) {
937 spin_unlock(&conn->ibc_lock);
938
939 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
940 if (tx)
941 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
942
943 spin_lock(&conn->ibc_lock);
944 if (tx)
945 kiblnd_queue_tx_locked(tx, conn);
946 }
947
948 for (;;) {
949 int credit;
950
951 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
952 credit = 0;
953 tx = list_entry(conn->ibc_tx_queue_nocred.next,
954 kib_tx_t, tx_list);
955 } else if (!list_empty(&conn->ibc_tx_noops)) {
956 LASSERT(!IBLND_OOB_CAPABLE(ver));
957 credit = 1;
958 tx = list_entry(conn->ibc_tx_noops.next,
959 kib_tx_t, tx_list);
960 } else if (!list_empty(&conn->ibc_tx_queue)) {
961 credit = 1;
962 tx = list_entry(conn->ibc_tx_queue.next,
963 kib_tx_t, tx_list);
964 } else {
965 break;
966 }
967
968 if (kiblnd_post_tx_locked(conn, tx, credit))
969 break;
970 }
971
972 spin_unlock(&conn->ibc_lock);
973 }
974
975 static void
976 kiblnd_tx_complete(kib_tx_t *tx, int status)
977 {
978 int failed = (status != IB_WC_SUCCESS);
979 kib_conn_t *conn = tx->tx_conn;
980 int idle;
981
982 LASSERT(tx->tx_sending > 0);
983
984 if (failed) {
985 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
986 CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
987 libcfs_nid2str(conn->ibc_peer->ibp_nid),
988 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
989 status);
990
991 kiblnd_close_conn(conn, -EIO);
992 } else {
993 kiblnd_peer_alive(conn->ibc_peer);
994 }
995
996 spin_lock(&conn->ibc_lock);
997
998 /*
999 * I could be racing with rdma completion. Whoever makes 'tx' idle
1000 * gets to free it, which also drops its ref on 'conn'.
1001 */
1002 tx->tx_sending--;
1003 conn->ibc_nsends_posted--;
1004 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1005 conn->ibc_noops_posted--;
1006
1007 if (failed) {
1008 tx->tx_waiting = 0; /* don't wait for peer */
1009 tx->tx_status = -EIO;
1010 }
1011
1012 idle = !tx->tx_sending && /* This is the final callback */
1013 !tx->tx_waiting && /* Not waiting for peer */
1014 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1015 if (idle)
1016 list_del(&tx->tx_list);
1017
1018 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1019
1020 spin_unlock(&conn->ibc_lock);
1021
1022 if (idle)
1023 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1024
1025 kiblnd_check_sends(conn);
1026
1027 kiblnd_conn_decref(conn); /* ...until here */
1028 }
1029
1030 static void
1031 kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1032 {
1033 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1034 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1035 struct ib_rdma_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1036 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1037 struct ib_mr *mr = hdev->ibh_mrs;
1038
1039 LASSERT(tx->tx_nwrq >= 0);
1040 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1041 LASSERT(nob <= IBLND_MSG_SIZE);
1042 LASSERT(mr);
1043
1044 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1045
1046 sge->lkey = mr->lkey;
1047 sge->addr = tx->tx_msgaddr;
1048 sge->length = nob;
1049
1050 memset(wrq, 0, sizeof(*wrq));
1051
1052 wrq->wr.next = NULL;
1053 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1054 wrq->wr.sg_list = sge;
1055 wrq->wr.num_sge = 1;
1056 wrq->wr.opcode = IB_WR_SEND;
1057 wrq->wr.send_flags = IB_SEND_SIGNALED;
1058
1059 tx->tx_nwrq++;
1060 }
1061
1062 static int
1063 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1064 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1065 {
1066 kib_msg_t *ibmsg = tx->tx_msg;
1067 kib_rdma_desc_t *srcrd = tx->tx_rd;
1068 struct ib_sge *sge = &tx->tx_sge[0];
1069 struct ib_rdma_wr *wrq = &tx->tx_wrq[0], *next;
1070 int rc = resid;
1071 int srcidx = 0;
1072 int dstidx = 0;
1073 int wrknob;
1074
1075 LASSERT(!in_interrupt());
1076 LASSERT(!tx->tx_nwrq);
1077 LASSERT(type == IBLND_MSG_GET_DONE ||
1078 type == IBLND_MSG_PUT_DONE);
1079
1080 while (resid > 0) {
1081 if (srcidx >= srcrd->rd_nfrags) {
1082 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1083 rc = -EPROTO;
1084 break;
1085 }
1086
1087 if (dstidx == dstrd->rd_nfrags) {
1088 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1089 rc = -EPROTO;
1090 break;
1091 }
1092
1093 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1094 CERROR("RDMA has too many fragments for peer %s (%d), src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1095 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1096 conn->ibc_max_frags,
1097 srcidx, srcrd->rd_nfrags,
1098 dstidx, dstrd->rd_nfrags);
1099 rc = -EMSGSIZE;
1100 break;
1101 }
1102
1103 wrknob = min(min(kiblnd_rd_frag_size(srcrd, srcidx),
1104 kiblnd_rd_frag_size(dstrd, dstidx)),
1105 (__u32) resid);
1106
1107 sge = &tx->tx_sge[tx->tx_nwrq];
1108 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1109 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1110 sge->length = wrknob;
1111
1112 wrq = &tx->tx_wrq[tx->tx_nwrq];
1113 next = wrq + 1;
1114
1115 wrq->wr.next = &next->wr;
1116 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1117 wrq->wr.sg_list = sge;
1118 wrq->wr.num_sge = 1;
1119 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1120 wrq->wr.send_flags = 0;
1121
1122 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1123 wrq->rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1124
1125 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1126 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1127
1128 resid -= wrknob;
1129
1130 tx->tx_nwrq++;
1131 wrq++;
1132 sge++;
1133 }
1134
1135 if (rc < 0) /* no RDMA if completing with failure */
1136 tx->tx_nwrq = 0;
1137
1138 ibmsg->ibm_u.completion.ibcm_status = rc;
1139 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1140 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1141 type, sizeof(kib_completion_msg_t));
1142
1143 return rc;
1144 }
1145
1146 static void
1147 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1148 {
1149 struct list_head *q;
1150
1151 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1152 LASSERT(!tx->tx_queued); /* not queued for sending already */
1153 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1154
1155 tx->tx_queued = 1;
1156 tx->tx_deadline = jiffies +
1157 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1158 MSEC_PER_SEC);
1159
1160 if (!tx->tx_conn) {
1161 kiblnd_conn_addref(conn);
1162 tx->tx_conn = conn;
1163 LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1164 } else {
1165 /* PUT_DONE first attached to conn as a PUT_REQ */
1166 LASSERT(tx->tx_conn == conn);
1167 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1168 }
1169
1170 switch (tx->tx_msg->ibm_type) {
1171 default:
1172 LBUG();
1173
1174 case IBLND_MSG_PUT_REQ:
1175 case IBLND_MSG_GET_REQ:
1176 q = &conn->ibc_tx_queue_rsrvd;
1177 break;
1178
1179 case IBLND_MSG_PUT_NAK:
1180 case IBLND_MSG_PUT_ACK:
1181 case IBLND_MSG_PUT_DONE:
1182 case IBLND_MSG_GET_DONE:
1183 q = &conn->ibc_tx_queue_nocred;
1184 break;
1185
1186 case IBLND_MSG_NOOP:
1187 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1188 q = &conn->ibc_tx_queue_nocred;
1189 else
1190 q = &conn->ibc_tx_noops;
1191 break;
1192
1193 case IBLND_MSG_IMMEDIATE:
1194 q = &conn->ibc_tx_queue;
1195 break;
1196 }
1197
1198 list_add_tail(&tx->tx_list, q);
1199 }
1200
1201 static void
1202 kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn)
1203 {
1204 spin_lock(&conn->ibc_lock);
1205 kiblnd_queue_tx_locked(tx, conn);
1206 spin_unlock(&conn->ibc_lock);
1207
1208 kiblnd_check_sends(conn);
1209 }
1210
1211 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1212 struct sockaddr_in *srcaddr,
1213 struct sockaddr_in *dstaddr,
1214 int timeout_ms)
1215 {
1216 unsigned short port;
1217 int rc;
1218
1219 /* allow the port to be reused */
1220 rc = rdma_set_reuseaddr(cmid, 1);
1221 if (rc) {
1222 CERROR("Unable to set reuse on cmid: %d\n", rc);
1223 return rc;
1224 }
1225
1226 /* look for a free privileged port */
1227 for (port = PROT_SOCK - 1; port > 0; port--) {
1228 srcaddr->sin_port = htons(port);
1229 rc = rdma_resolve_addr(cmid,
1230 (struct sockaddr *)srcaddr,
1231 (struct sockaddr *)dstaddr,
1232 timeout_ms);
1233 if (!rc) {
1234 CDEBUG(D_NET, "bound to port %hu\n", port);
1235 return 0;
1236 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1237 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1238 port, rc);
1239 } else {
1240 return rc;
1241 }
1242 }
1243
1244 CERROR("Failed to bind to a free privileged port\n");
1245 return rc;
1246 }
1247
1248 static void
1249 kiblnd_connect_peer(kib_peer_t *peer)
1250 {
1251 struct rdma_cm_id *cmid;
1252 kib_dev_t *dev;
1253 kib_net_t *net = peer->ibp_ni->ni_data;
1254 struct sockaddr_in srcaddr;
1255 struct sockaddr_in dstaddr;
1256 int rc;
1257
1258 LASSERT(net);
1259 LASSERT(peer->ibp_connecting > 0);
1260 LASSERT(!peer->ibp_reconnecting);
1261
1262 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1263 IB_QPT_RC);
1264
1265 if (IS_ERR(cmid)) {
1266 CERROR("Can't create CMID for %s: %ld\n",
1267 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1268 rc = PTR_ERR(cmid);
1269 goto failed;
1270 }
1271
1272 dev = net->ibn_dev;
1273 memset(&srcaddr, 0, sizeof(srcaddr));
1274 srcaddr.sin_family = AF_INET;
1275 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1276
1277 memset(&dstaddr, 0, sizeof(dstaddr));
1278 dstaddr.sin_family = AF_INET;
1279 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1280 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1281
1282 kiblnd_peer_addref(peer); /* cmid's ref */
1283
1284 if (*kiblnd_tunables.kib_use_priv_port) {
1285 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1286 *kiblnd_tunables.kib_timeout * 1000);
1287 } else {
1288 rc = rdma_resolve_addr(cmid,
1289 (struct sockaddr *)&srcaddr,
1290 (struct sockaddr *)&dstaddr,
1291 *kiblnd_tunables.kib_timeout * 1000);
1292 }
1293 if (rc) {
1294 /* Can't initiate address resolution: */
1295 CERROR("Can't resolve addr for %s: %d\n",
1296 libcfs_nid2str(peer->ibp_nid), rc);
1297 goto failed2;
1298 }
1299
1300 LASSERT(cmid->device);
1301 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1302 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1303 &dev->ibd_ifip, cmid->device->name);
1304
1305 return;
1306
1307 failed2:
1308 kiblnd_peer_connect_failed(peer, 1, rc);
1309 kiblnd_peer_decref(peer); /* cmid's ref */
1310 rdma_destroy_id(cmid);
1311 return;
1312 failed:
1313 kiblnd_peer_connect_failed(peer, 1, rc);
1314 }
1315
1316 bool
1317 kiblnd_reconnect_peer(kib_peer_t *peer)
1318 {
1319 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1320 char *reason = NULL;
1321 struct list_head txs;
1322 unsigned long flags;
1323
1324 INIT_LIST_HEAD(&txs);
1325
1326 write_lock_irqsave(glock, flags);
1327 if (!peer->ibp_reconnecting) {
1328 if (peer->ibp_accepting)
1329 reason = "accepting";
1330 else if (peer->ibp_connecting)
1331 reason = "connecting";
1332 else if (!list_empty(&peer->ibp_conns))
1333 reason = "connected";
1334 else /* connected then closed */
1335 reason = "closed";
1336
1337 goto no_reconnect;
1338 }
1339
1340 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1341 list_empty(&peer->ibp_conns));
1342 peer->ibp_reconnecting = 0;
1343
1344 if (!kiblnd_peer_active(peer)) {
1345 list_splice_init(&peer->ibp_tx_queue, &txs);
1346 reason = "unlinked";
1347 goto no_reconnect;
1348 }
1349
1350 peer->ibp_connecting++;
1351 peer->ibp_reconnected++;
1352 write_unlock_irqrestore(glock, flags);
1353
1354 kiblnd_connect_peer(peer);
1355 return true;
1356
1357 no_reconnect:
1358 write_unlock_irqrestore(glock, flags);
1359
1360 CWARN("Abort reconnection of %s: %s\n",
1361 libcfs_nid2str(peer->ibp_nid), reason);
1362 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1363 return false;
1364 }
1365
1366 void
1367 kiblnd_launch_tx(lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1368 {
1369 kib_peer_t *peer;
1370 kib_peer_t *peer2;
1371 kib_conn_t *conn;
1372 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1373 unsigned long flags;
1374 int rc;
1375
1376 /*
1377 * If I get here, I've committed to send, so I complete the tx with
1378 * failure on any problems
1379 */
1380 LASSERT(!tx || !tx->tx_conn); /* only set when assigned a conn */
1381 LASSERT(!tx || tx->tx_nwrq > 0); /* work items have been set up */
1382
1383 /*
1384 * First time, just use a read lock since I expect to find my peer
1385 * connected
1386 */
1387 read_lock_irqsave(g_lock, flags);
1388
1389 peer = kiblnd_find_peer_locked(nid);
1390 if (peer && !list_empty(&peer->ibp_conns)) {
1391 /* Found a peer with an established connection */
1392 conn = kiblnd_get_conn_locked(peer);
1393 kiblnd_conn_addref(conn); /* 1 ref for me... */
1394
1395 read_unlock_irqrestore(g_lock, flags);
1396
1397 if (tx)
1398 kiblnd_queue_tx(tx, conn);
1399 kiblnd_conn_decref(conn); /* ...to here */
1400 return;
1401 }
1402
1403 read_unlock(g_lock);
1404 /* Re-try with a write lock */
1405 write_lock(g_lock);
1406
1407 peer = kiblnd_find_peer_locked(nid);
1408 if (peer) {
1409 if (list_empty(&peer->ibp_conns)) {
1410 /* found a peer, but it's still connecting... */
1411 LASSERT(kiblnd_peer_connecting(peer));
1412 if (tx)
1413 list_add_tail(&tx->tx_list,
1414 &peer->ibp_tx_queue);
1415 write_unlock_irqrestore(g_lock, flags);
1416 } else {
1417 conn = kiblnd_get_conn_locked(peer);
1418 kiblnd_conn_addref(conn); /* 1 ref for me... */
1419
1420 write_unlock_irqrestore(g_lock, flags);
1421
1422 if (tx)
1423 kiblnd_queue_tx(tx, conn);
1424 kiblnd_conn_decref(conn); /* ...to here */
1425 }
1426 return;
1427 }
1428
1429 write_unlock_irqrestore(g_lock, flags);
1430
1431 /* Allocate a peer ready to add to the peer table and retry */
1432 rc = kiblnd_create_peer(ni, &peer, nid);
1433 if (rc) {
1434 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1435 if (tx) {
1436 tx->tx_status = -EHOSTUNREACH;
1437 tx->tx_waiting = 0;
1438 kiblnd_tx_done(ni, tx);
1439 }
1440 return;
1441 }
1442
1443 write_lock_irqsave(g_lock, flags);
1444
1445 peer2 = kiblnd_find_peer_locked(nid);
1446 if (peer2) {
1447 if (list_empty(&peer2->ibp_conns)) {
1448 /* found a peer, but it's still connecting... */
1449 LASSERT(kiblnd_peer_connecting(peer2));
1450 if (tx)
1451 list_add_tail(&tx->tx_list,
1452 &peer2->ibp_tx_queue);
1453 write_unlock_irqrestore(g_lock, flags);
1454 } else {
1455 conn = kiblnd_get_conn_locked(peer2);
1456 kiblnd_conn_addref(conn); /* 1 ref for me... */
1457
1458 write_unlock_irqrestore(g_lock, flags);
1459
1460 if (tx)
1461 kiblnd_queue_tx(tx, conn);
1462 kiblnd_conn_decref(conn); /* ...to here */
1463 }
1464
1465 kiblnd_peer_decref(peer);
1466 return;
1467 }
1468
1469 /* Brand new peer */
1470 LASSERT(!peer->ibp_connecting);
1471 peer->ibp_connecting = 1;
1472
1473 /* always called with a ref on ni, which prevents ni being shutdown */
1474 LASSERT(!((kib_net_t *)ni->ni_data)->ibn_shutdown);
1475
1476 if (tx)
1477 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1478
1479 kiblnd_peer_addref(peer);
1480 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1481
1482 write_unlock_irqrestore(g_lock, flags);
1483
1484 kiblnd_connect_peer(peer);
1485 kiblnd_peer_decref(peer);
1486 }
1487
1488 int
1489 kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1490 {
1491 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1492 int type = lntmsg->msg_type;
1493 lnet_process_id_t target = lntmsg->msg_target;
1494 int target_is_router = lntmsg->msg_target_is_router;
1495 int routing = lntmsg->msg_routing;
1496 unsigned int payload_niov = lntmsg->msg_niov;
1497 struct kvec *payload_iov = lntmsg->msg_iov;
1498 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1499 unsigned int payload_offset = lntmsg->msg_offset;
1500 unsigned int payload_nob = lntmsg->msg_len;
1501 kib_msg_t *ibmsg;
1502 kib_rdma_desc_t *rd;
1503 kib_tx_t *tx;
1504 int nob;
1505 int rc;
1506
1507 /* NB 'private' is different depending on what we're sending.... */
1508
1509 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1510 payload_nob, payload_niov, libcfs_id2str(target));
1511
1512 LASSERT(!payload_nob || payload_niov > 0);
1513 LASSERT(payload_niov <= LNET_MAX_IOV);
1514
1515 /* Thread context */
1516 LASSERT(!in_interrupt());
1517 /* payload is either all vaddrs or all pages */
1518 LASSERT(!(payload_kiov && payload_iov));
1519
1520 switch (type) {
1521 default:
1522 LBUG();
1523 return -EIO;
1524
1525 case LNET_MSG_ACK:
1526 LASSERT(!payload_nob);
1527 break;
1528
1529 case LNET_MSG_GET:
1530 if (routing || target_is_router)
1531 break; /* send IMMEDIATE */
1532
1533 /* is the REPLY message too small for RDMA? */
1534 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1535 if (nob <= IBLND_MSG_SIZE)
1536 break; /* send IMMEDIATE */
1537
1538 tx = kiblnd_get_idle_tx(ni, target.nid);
1539 if (!tx) {
1540 CERROR("Can't allocate txd for GET to %s\n",
1541 libcfs_nid2str(target.nid));
1542 return -ENOMEM;
1543 }
1544
1545 ibmsg = tx->tx_msg;
1546 rd = &ibmsg->ibm_u.get.ibgm_rd;
1547 if (!(lntmsg->msg_md->md_options & LNET_MD_KIOV))
1548 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1549 lntmsg->msg_md->md_niov,
1550 lntmsg->msg_md->md_iov.iov,
1551 0, lntmsg->msg_md->md_length);
1552 else
1553 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1554 lntmsg->msg_md->md_niov,
1555 lntmsg->msg_md->md_iov.kiov,
1556 0, lntmsg->msg_md->md_length);
1557 if (rc) {
1558 CERROR("Can't setup GET sink for %s: %d\n",
1559 libcfs_nid2str(target.nid), rc);
1560 kiblnd_tx_done(ni, tx);
1561 return -EIO;
1562 }
1563
1564 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1565 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1566 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1567
1568 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1569
1570 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1571 if (!tx->tx_lntmsg[1]) {
1572 CERROR("Can't create reply for GET -> %s\n",
1573 libcfs_nid2str(target.nid));
1574 kiblnd_tx_done(ni, tx);
1575 return -EIO;
1576 }
1577
1578 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1579 tx->tx_waiting = 1; /* waiting for GET_DONE */
1580 kiblnd_launch_tx(ni, tx, target.nid);
1581 return 0;
1582
1583 case LNET_MSG_REPLY:
1584 case LNET_MSG_PUT:
1585 /* Is the payload small enough not to need RDMA? */
1586 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1587 if (nob <= IBLND_MSG_SIZE)
1588 break; /* send IMMEDIATE */
1589
1590 tx = kiblnd_get_idle_tx(ni, target.nid);
1591 if (!tx) {
1592 CERROR("Can't allocate %s txd for %s\n",
1593 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1594 libcfs_nid2str(target.nid));
1595 return -ENOMEM;
1596 }
1597
1598 if (!payload_kiov)
1599 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1600 payload_niov, payload_iov,
1601 payload_offset, payload_nob);
1602 else
1603 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1604 payload_niov, payload_kiov,
1605 payload_offset, payload_nob);
1606 if (rc) {
1607 CERROR("Can't setup PUT src for %s: %d\n",
1608 libcfs_nid2str(target.nid), rc);
1609 kiblnd_tx_done(ni, tx);
1610 return -EIO;
1611 }
1612
1613 ibmsg = tx->tx_msg;
1614 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1615 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1616 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1617
1618 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1619 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1620 kiblnd_launch_tx(ni, tx, target.nid);
1621 return 0;
1622 }
1623
1624 /* send IMMEDIATE */
1625
1626 LASSERT(offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1627 <= IBLND_MSG_SIZE);
1628
1629 tx = kiblnd_get_idle_tx(ni, target.nid);
1630 if (!tx) {
1631 CERROR("Can't send %d to %s: tx descs exhausted\n",
1632 type, libcfs_nid2str(target.nid));
1633 return -ENOMEM;
1634 }
1635
1636 ibmsg = tx->tx_msg;
1637 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1638
1639 if (payload_kiov)
1640 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1641 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1642 payload_niov, payload_kiov,
1643 payload_offset, payload_nob);
1644 else
1645 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1646 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1647 payload_niov, payload_iov,
1648 payload_offset, payload_nob);
1649
1650 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1651 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1652
1653 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1654 kiblnd_launch_tx(ni, tx, target.nid);
1655 return 0;
1656 }
1657
1658 static void
1659 kiblnd_reply(lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1660 {
1661 lnet_process_id_t target = lntmsg->msg_target;
1662 unsigned int niov = lntmsg->msg_niov;
1663 struct kvec *iov = lntmsg->msg_iov;
1664 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1665 unsigned int offset = lntmsg->msg_offset;
1666 unsigned int nob = lntmsg->msg_len;
1667 kib_tx_t *tx;
1668 int rc;
1669
1670 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1671 if (!tx) {
1672 CERROR("Can't get tx for REPLY to %s\n",
1673 libcfs_nid2str(target.nid));
1674 goto failed_0;
1675 }
1676
1677 if (!nob)
1678 rc = 0;
1679 else if (!kiov)
1680 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1681 niov, iov, offset, nob);
1682 else
1683 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1684 niov, kiov, offset, nob);
1685
1686 if (rc) {
1687 CERROR("Can't setup GET src for %s: %d\n",
1688 libcfs_nid2str(target.nid), rc);
1689 goto failed_1;
1690 }
1691
1692 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1693 IBLND_MSG_GET_DONE, nob,
1694 &rx->rx_msg->ibm_u.get.ibgm_rd,
1695 rx->rx_msg->ibm_u.get.ibgm_cookie);
1696 if (rc < 0) {
1697 CERROR("Can't setup rdma for GET from %s: %d\n",
1698 libcfs_nid2str(target.nid), rc);
1699 goto failed_1;
1700 }
1701
1702 if (!nob) {
1703 /* No RDMA: local completion may happen now! */
1704 lnet_finalize(ni, lntmsg, 0);
1705 } else {
1706 /* RDMA: lnet_finalize(lntmsg) when it completes */
1707 tx->tx_lntmsg[0] = lntmsg;
1708 }
1709
1710 kiblnd_queue_tx(tx, rx->rx_conn);
1711 return;
1712
1713 failed_1:
1714 kiblnd_tx_done(ni, tx);
1715 failed_0:
1716 lnet_finalize(ni, lntmsg, -EIO);
1717 }
1718
1719 int
1720 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1721 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1722 unsigned int offset, unsigned int mlen, unsigned int rlen)
1723 {
1724 kib_rx_t *rx = private;
1725 kib_msg_t *rxmsg = rx->rx_msg;
1726 kib_conn_t *conn = rx->rx_conn;
1727 kib_tx_t *tx;
1728 int nob;
1729 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1730 int rc = 0;
1731
1732 LASSERT(mlen <= rlen);
1733 LASSERT(!in_interrupt());
1734 /* Either all pages or all vaddrs */
1735 LASSERT(!(kiov && iov));
1736
1737 switch (rxmsg->ibm_type) {
1738 default:
1739 LBUG();
1740
1741 case IBLND_MSG_IMMEDIATE:
1742 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1743 if (nob > rx->rx_nob) {
1744 CERROR("Immediate message from %s too big: %d(%d)\n",
1745 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1746 nob, rx->rx_nob);
1747 rc = -EPROTO;
1748 break;
1749 }
1750
1751 if (kiov)
1752 lnet_copy_flat2kiov(niov, kiov, offset,
1753 IBLND_MSG_SIZE, rxmsg,
1754 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1755 mlen);
1756 else
1757 lnet_copy_flat2iov(niov, iov, offset,
1758 IBLND_MSG_SIZE, rxmsg,
1759 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1760 mlen);
1761 lnet_finalize(ni, lntmsg, 0);
1762 break;
1763
1764 case IBLND_MSG_PUT_REQ: {
1765 kib_msg_t *txmsg;
1766 kib_rdma_desc_t *rd;
1767
1768 if (!mlen) {
1769 lnet_finalize(ni, lntmsg, 0);
1770 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1771 rxmsg->ibm_u.putreq.ibprm_cookie);
1772 break;
1773 }
1774
1775 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1776 if (!tx) {
1777 CERROR("Can't allocate tx for %s\n",
1778 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1779 /* Not replying will break the connection */
1780 rc = -ENOMEM;
1781 break;
1782 }
1783
1784 txmsg = tx->tx_msg;
1785 rd = &txmsg->ibm_u.putack.ibpam_rd;
1786 if (!kiov)
1787 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1788 niov, iov, offset, mlen);
1789 else
1790 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1791 niov, kiov, offset, mlen);
1792 if (rc) {
1793 CERROR("Can't setup PUT sink for %s: %d\n",
1794 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1795 kiblnd_tx_done(ni, tx);
1796 /* tell peer it's over */
1797 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1798 rxmsg->ibm_u.putreq.ibprm_cookie);
1799 break;
1800 }
1801
1802 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1803 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1804 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1805
1806 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1807
1808 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1809 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1810 kiblnd_queue_tx(tx, conn);
1811
1812 /* reposted buffer reserved for PUT_DONE */
1813 post_credit = IBLND_POSTRX_NO_CREDIT;
1814 break;
1815 }
1816
1817 case IBLND_MSG_GET_REQ:
1818 if (lntmsg) {
1819 /* Optimized GET; RDMA lntmsg's payload */
1820 kiblnd_reply(ni, rx, lntmsg);
1821 } else {
1822 /* GET didn't match anything */
1823 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1824 -ENODATA,
1825 rxmsg->ibm_u.get.ibgm_cookie);
1826 }
1827 break;
1828 }
1829
1830 kiblnd_post_rx(rx, post_credit);
1831 return rc;
1832 }
1833
1834 int
1835 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1836 {
1837 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1838
1839 if (IS_ERR(task))
1840 return PTR_ERR(task);
1841
1842 atomic_inc(&kiblnd_data.kib_nthreads);
1843 return 0;
1844 }
1845
1846 static void
1847 kiblnd_thread_fini(void)
1848 {
1849 atomic_dec(&kiblnd_data.kib_nthreads);
1850 }
1851
1852 static void
1853 kiblnd_peer_alive(kib_peer_t *peer)
1854 {
1855 /* This is racy, but everyone's only writing cfs_time_current() */
1856 peer->ibp_last_alive = cfs_time_current();
1857 mb();
1858 }
1859
1860 static void
1861 kiblnd_peer_notify(kib_peer_t *peer)
1862 {
1863 int error = 0;
1864 unsigned long last_alive = 0;
1865 unsigned long flags;
1866
1867 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1868
1869 if (kiblnd_peer_idle(peer) && peer->ibp_error) {
1870 error = peer->ibp_error;
1871 peer->ibp_error = 0;
1872
1873 last_alive = peer->ibp_last_alive;
1874 }
1875
1876 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1877
1878 if (error)
1879 lnet_notify(peer->ibp_ni,
1880 peer->ibp_nid, 0, last_alive);
1881 }
1882
1883 void
1884 kiblnd_close_conn_locked(kib_conn_t *conn, int error)
1885 {
1886 /*
1887 * This just does the immediate housekeeping. 'error' is zero for a
1888 * normal shutdown which can happen only after the connection has been
1889 * established. If the connection is established, schedule the
1890 * connection to be finished off by the connd. Otherwise the connd is
1891 * already dealing with it (either to set it up or tear it down).
1892 * Caller holds kib_global_lock exclusively in irq context
1893 */
1894 kib_peer_t *peer = conn->ibc_peer;
1895 kib_dev_t *dev;
1896 unsigned long flags;
1897
1898 LASSERT(error || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1899
1900 if (error && !conn->ibc_comms_error)
1901 conn->ibc_comms_error = error;
1902
1903 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1904 return; /* already being handled */
1905
1906 if (!error &&
1907 list_empty(&conn->ibc_tx_noops) &&
1908 list_empty(&conn->ibc_tx_queue) &&
1909 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1910 list_empty(&conn->ibc_tx_queue_nocred) &&
1911 list_empty(&conn->ibc_active_txs)) {
1912 CDEBUG(D_NET, "closing conn to %s\n",
1913 libcfs_nid2str(peer->ibp_nid));
1914 } else {
1915 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1916 libcfs_nid2str(peer->ibp_nid), error,
1917 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1918 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1919 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1920 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1921 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1922 }
1923
1924 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1925 list_del(&conn->ibc_list);
1926 /* connd (see below) takes over ibc_list's ref */
1927
1928 if (list_empty(&peer->ibp_conns) && /* no more conns */
1929 kiblnd_peer_active(peer)) { /* still in peer table */
1930 kiblnd_unlink_peer_locked(peer);
1931
1932 /* set/clear error on last conn */
1933 peer->ibp_error = conn->ibc_comms_error;
1934 }
1935
1936 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1937
1938 if (error &&
1939 kiblnd_dev_can_failover(dev)) {
1940 list_add_tail(&dev->ibd_fail_list,
1941 &kiblnd_data.kib_failed_devs);
1942 wake_up(&kiblnd_data.kib_failover_waitq);
1943 }
1944
1945 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1946
1947 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1948 wake_up(&kiblnd_data.kib_connd_waitq);
1949
1950 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1951 }
1952
1953 void
1954 kiblnd_close_conn(kib_conn_t *conn, int error)
1955 {
1956 unsigned long flags;
1957
1958 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1959
1960 kiblnd_close_conn_locked(conn, error);
1961
1962 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1963 }
1964
1965 static void
1966 kiblnd_handle_early_rxs(kib_conn_t *conn)
1967 {
1968 unsigned long flags;
1969 kib_rx_t *rx;
1970 kib_rx_t *tmp;
1971
1972 LASSERT(!in_interrupt());
1973 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1974
1975 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1976 list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
1977 list_del(&rx->rx_list);
1978 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1979
1980 kiblnd_handle_rx(rx);
1981
1982 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1983 }
1984 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1985 }
1986
1987 static void
1988 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1989 {
1990 LIST_HEAD(zombies);
1991 struct list_head *tmp;
1992 struct list_head *nxt;
1993 kib_tx_t *tx;
1994
1995 spin_lock(&conn->ibc_lock);
1996
1997 list_for_each_safe(tmp, nxt, txs) {
1998 tx = list_entry(tmp, kib_tx_t, tx_list);
1999
2000 if (txs == &conn->ibc_active_txs) {
2001 LASSERT(!tx->tx_queued);
2002 LASSERT(tx->tx_waiting || tx->tx_sending);
2003 } else {
2004 LASSERT(tx->tx_queued);
2005 }
2006
2007 tx->tx_status = -ECONNABORTED;
2008 tx->tx_waiting = 0;
2009
2010 if (!tx->tx_sending) {
2011 tx->tx_queued = 0;
2012 list_del(&tx->tx_list);
2013 list_add(&tx->tx_list, &zombies);
2014 }
2015 }
2016
2017 spin_unlock(&conn->ibc_lock);
2018
2019 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2020 }
2021
2022 static void
2023 kiblnd_finalise_conn(kib_conn_t *conn)
2024 {
2025 LASSERT(!in_interrupt());
2026 LASSERT(conn->ibc_state > IBLND_CONN_INIT);
2027
2028 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2029
2030 /*
2031 * abort_receives moves QP state to IB_QPS_ERR. This is only required
2032 * for connections that didn't get as far as being connected, because
2033 * rdma_disconnect() does this for free.
2034 */
2035 kiblnd_abort_receives(conn);
2036
2037 /*
2038 * Complete all tx descs not waiting for sends to complete.
2039 * NB we should be safe from RDMA now that the QP has changed state
2040 */
2041 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2042 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2043 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2044 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2045 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2046
2047 kiblnd_handle_early_rxs(conn);
2048 }
2049
2050 static void
2051 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2052 {
2053 LIST_HEAD(zombies);
2054 unsigned long flags;
2055
2056 LASSERT(error);
2057 LASSERT(!in_interrupt());
2058
2059 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2060
2061 if (active) {
2062 LASSERT(peer->ibp_connecting > 0);
2063 peer->ibp_connecting--;
2064 } else {
2065 LASSERT(peer->ibp_accepting > 0);
2066 peer->ibp_accepting--;
2067 }
2068
2069 if (kiblnd_peer_connecting(peer)) {
2070 /* another connection attempt under way... */
2071 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2072 flags);
2073 return;
2074 }
2075
2076 peer->ibp_reconnected = 0;
2077 if (list_empty(&peer->ibp_conns)) {
2078 /* Take peer's blocked transmits to complete with error */
2079 list_add(&zombies, &peer->ibp_tx_queue);
2080 list_del_init(&peer->ibp_tx_queue);
2081
2082 if (kiblnd_peer_active(peer))
2083 kiblnd_unlink_peer_locked(peer);
2084
2085 peer->ibp_error = error;
2086 } else {
2087 /* Can't have blocked transmits if there are connections */
2088 LASSERT(list_empty(&peer->ibp_tx_queue));
2089 }
2090
2091 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2092
2093 kiblnd_peer_notify(peer);
2094
2095 if (list_empty(&zombies))
2096 return;
2097
2098 CNETERR("Deleting messages for %s: connection failed\n",
2099 libcfs_nid2str(peer->ibp_nid));
2100
2101 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2102 }
2103
2104 static void
2105 kiblnd_connreq_done(kib_conn_t *conn, int status)
2106 {
2107 kib_peer_t *peer = conn->ibc_peer;
2108 kib_tx_t *tx;
2109 kib_tx_t *tmp;
2110 struct list_head txs;
2111 unsigned long flags;
2112 int active;
2113
2114 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2115
2116 CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
2117 libcfs_nid2str(peer->ibp_nid), active,
2118 conn->ibc_version, status);
2119
2120 LASSERT(!in_interrupt());
2121 LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2122 peer->ibp_connecting > 0) ||
2123 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2124 peer->ibp_accepting > 0));
2125
2126 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2127 conn->ibc_connvars = NULL;
2128
2129 if (status) {
2130 /* failed to establish connection */
2131 kiblnd_peer_connect_failed(peer, active, status);
2132 kiblnd_finalise_conn(conn);
2133 return;
2134 }
2135
2136 /* connection established */
2137 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2138
2139 conn->ibc_last_send = jiffies;
2140 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2141 kiblnd_peer_alive(peer);
2142
2143 /*
2144 * Add conn to peer's list and nuke any dangling conns from a different
2145 * peer instance...
2146 */
2147 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2148 list_add(&conn->ibc_list, &peer->ibp_conns);
2149 peer->ibp_reconnected = 0;
2150 if (active)
2151 peer->ibp_connecting--;
2152 else
2153 peer->ibp_accepting--;
2154
2155 if (!peer->ibp_version) {
2156 peer->ibp_version = conn->ibc_version;
2157 peer->ibp_incarnation = conn->ibc_incarnation;
2158 }
2159
2160 if (peer->ibp_version != conn->ibc_version ||
2161 peer->ibp_incarnation != conn->ibc_incarnation) {
2162 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2163 conn->ibc_incarnation);
2164 peer->ibp_version = conn->ibc_version;
2165 peer->ibp_incarnation = conn->ibc_incarnation;
2166 }
2167
2168 /* grab pending txs while I have the lock */
2169 list_add(&txs, &peer->ibp_tx_queue);
2170 list_del_init(&peer->ibp_tx_queue);
2171
2172 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2173 conn->ibc_comms_error) { /* error has happened already */
2174 lnet_ni_t *ni = peer->ibp_ni;
2175
2176 /* start to shut down connection */
2177 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2178 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2179
2180 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2181
2182 return;
2183 }
2184
2185 /**
2186 * refcount taken by cmid is not reliable after I released the glock
2187 * because this connection is visible to other threads now, another
2188 * thread can find and close this connection right after I released
2189 * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2190 * called, it can release the connection refcount taken by cmid.
2191 * It means the connection could be destroyed before I finish my
2192 * operations on it.
2193 */
2194 kiblnd_conn_addref(conn);
2195 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2196
2197 /* Schedule blocked txs */
2198 spin_lock(&conn->ibc_lock);
2199 list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
2200 list_del(&tx->tx_list);
2201
2202 kiblnd_queue_tx_locked(tx, conn);
2203 }
2204 spin_unlock(&conn->ibc_lock);
2205
2206 kiblnd_check_sends(conn);
2207
2208 /* schedule blocked rxs */
2209 kiblnd_handle_early_rxs(conn);
2210
2211 kiblnd_conn_decref(conn);
2212 }
2213
2214 static void
2215 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2216 {
2217 int rc;
2218
2219 rc = rdma_reject(cmid, rej, sizeof(*rej));
2220
2221 if (rc)
2222 CWARN("Error %d sending reject\n", rc);
2223 }
2224
2225 static int
2226 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2227 {
2228 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2229 kib_msg_t *reqmsg = priv;
2230 kib_msg_t *ackmsg;
2231 kib_dev_t *ibdev;
2232 kib_peer_t *peer;
2233 kib_peer_t *peer2;
2234 kib_conn_t *conn;
2235 lnet_ni_t *ni = NULL;
2236 kib_net_t *net = NULL;
2237 lnet_nid_t nid;
2238 struct rdma_conn_param cp;
2239 kib_rej_t rej;
2240 int version = IBLND_MSG_VERSION;
2241 unsigned long flags;
2242 int rc;
2243 struct sockaddr_in *peer_addr;
2244
2245 LASSERT(!in_interrupt());
2246
2247 /* cmid inherits 'context' from the corresponding listener id */
2248 ibdev = (kib_dev_t *)cmid->context;
2249 LASSERT(ibdev);
2250
2251 memset(&rej, 0, sizeof(rej));
2252 rej.ibr_magic = IBLND_MSG_MAGIC;
2253 rej.ibr_why = IBLND_REJECT_FATAL;
2254 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2255
2256 peer_addr = (struct sockaddr_in *)&cmid->route.addr.dst_addr;
2257 if (*kiblnd_tunables.kib_require_priv_port &&
2258 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2259 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2260
2261 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2262 &ip, ntohs(peer_addr->sin_port));
2263 goto failed;
2264 }
2265
2266 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2267 CERROR("Short connection request\n");
2268 goto failed;
2269 }
2270
2271 /*
2272 * Future protocol version compatibility support! If the
2273 * o2iblnd-specific protocol changes, or when LNET unifies
2274 * protocols over all LNDs, the initial connection will
2275 * negotiate a protocol version. I trap this here to avoid
2276 * console errors; the reject tells the peer which protocol I
2277 * speak.
2278 */
2279 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2280 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2281 goto failed;
2282 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2283 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2284 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2285 goto failed;
2286 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2287 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2288 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2289 goto failed;
2290
2291 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2292 if (rc) {
2293 CERROR("Can't parse connection request: %d\n", rc);
2294 goto failed;
2295 }
2296
2297 nid = reqmsg->ibm_srcnid;
2298 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2299
2300 if (ni) {
2301 net = (kib_net_t *)ni->ni_data;
2302 rej.ibr_incarnation = net->ibn_incarnation;
2303 }
2304
2305 if (!ni || /* no matching net */
2306 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2307 net->ibn_dev != ibdev) { /* wrong device */
2308 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
2309 libcfs_nid2str(nid),
2310 !ni ? "NA" : libcfs_nid2str(ni->ni_nid),
2311 ibdev->ibd_ifname, ibdev->ibd_nnets,
2312 &ibdev->ibd_ifip,
2313 libcfs_nid2str(reqmsg->ibm_dstnid));
2314
2315 goto failed;
2316 }
2317
2318 /* check time stamp as soon as possible */
2319 if (reqmsg->ibm_dststamp &&
2320 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2321 CWARN("Stale connection request\n");
2322 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2323 goto failed;
2324 }
2325
2326 /* I can accept peer's version */
2327 version = reqmsg->ibm_version;
2328
2329 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2330 CERROR("Unexpected connreq msg type: %x from %s\n",
2331 reqmsg->ibm_type, libcfs_nid2str(nid));
2332 goto failed;
2333 }
2334
2335 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2336 IBLND_MSG_QUEUE_SIZE(version)) {
2337 CERROR("Can't accept conn from %s, queue depth too large: %d (<=%d wanted)\n",
2338 libcfs_nid2str(nid),
2339 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2340 IBLND_MSG_QUEUE_SIZE(version));
2341
2342 if (version == IBLND_MSG_VERSION)
2343 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2344
2345 goto failed;
2346 }
2347
2348 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2349 IBLND_RDMA_FRAGS(version)) {
2350 CWARN("Can't accept conn from %s (version %x): max_frags %d too large (%d wanted)\n",
2351 libcfs_nid2str(nid), version,
2352 reqmsg->ibm_u.connparams.ibcp_max_frags,
2353 IBLND_RDMA_FRAGS(version));
2354
2355 if (version >= IBLND_MSG_VERSION)
2356 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2357
2358 goto failed;
2359 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2360 IBLND_RDMA_FRAGS(version) && !net->ibn_fmr_ps) {
2361 CWARN("Can't accept conn from %s (version %x): max_frags %d incompatible without FMR pool (%d wanted)\n",
2362 libcfs_nid2str(nid), version,
2363 reqmsg->ibm_u.connparams.ibcp_max_frags,
2364 IBLND_RDMA_FRAGS(version));
2365
2366 if (version >= IBLND_MSG_VERSION)
2367 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2368
2369 goto failed;
2370 }
2371
2372 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2373 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2374 libcfs_nid2str(nid),
2375 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2376 IBLND_MSG_SIZE);
2377 goto failed;
2378 }
2379
2380 /* assume 'nid' is a new peer; create */
2381 rc = kiblnd_create_peer(ni, &peer, nid);
2382 if (rc) {
2383 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2384 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2385 goto failed;
2386 }
2387
2388 /* We have validated the peer's parameters so use those */
2389 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2390 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2391
2392 write_lock_irqsave(g_lock, flags);
2393
2394 peer2 = kiblnd_find_peer_locked(nid);
2395 if (peer2) {
2396 if (!peer2->ibp_version) {
2397 peer2->ibp_version = version;
2398 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2399 }
2400
2401 /* not the guy I've talked with */
2402 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2403 peer2->ibp_version != version) {
2404 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2405
2406 if (kiblnd_peer_active(peer2)) {
2407 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2408 peer2->ibp_version = version;
2409 }
2410 write_unlock_irqrestore(g_lock, flags);
2411
2412 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2413 libcfs_nid2str(nid), peer2->ibp_version, version,
2414 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2415
2416 kiblnd_peer_decref(peer);
2417 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2418 goto failed;
2419 }
2420
2421 /* tie-break connection race in favour of the higher NID */
2422 if (peer2->ibp_connecting &&
2423 nid < ni->ni_nid) {
2424 write_unlock_irqrestore(g_lock, flags);
2425
2426 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2427
2428 kiblnd_peer_decref(peer);
2429 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2430 goto failed;
2431 }
2432
2433 /**
2434 * passive connection is allowed even this peer is waiting for
2435 * reconnection.
2436 */
2437 peer2->ibp_reconnecting = 0;
2438 peer2->ibp_accepting++;
2439 kiblnd_peer_addref(peer2);
2440
2441 /**
2442 * Race with kiblnd_launch_tx (active connect) to create peer
2443 * so copy validated parameters since we now know what the
2444 * peer's limits are
2445 */
2446 peer2->ibp_max_frags = peer->ibp_max_frags;
2447 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2448
2449 write_unlock_irqrestore(g_lock, flags);
2450 kiblnd_peer_decref(peer);
2451 peer = peer2;
2452 } else {
2453 /* Brand new peer */
2454 LASSERT(!peer->ibp_accepting);
2455 LASSERT(!peer->ibp_version &&
2456 !peer->ibp_incarnation);
2457
2458 peer->ibp_accepting = 1;
2459 peer->ibp_version = version;
2460 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2461
2462 /* I have a ref on ni that prevents it being shutdown */
2463 LASSERT(!net->ibn_shutdown);
2464
2465 kiblnd_peer_addref(peer);
2466 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2467
2468 write_unlock_irqrestore(g_lock, flags);
2469 }
2470
2471 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT,
2472 version);
2473 if (!conn) {
2474 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2475 kiblnd_peer_decref(peer);
2476 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2477 goto failed;
2478 }
2479
2480 /*
2481 * conn now "owns" cmid, so I return success from here on to ensure the
2482 * CM callback doesn't destroy cmid.
2483 */
2484 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2485 conn->ibc_credits = conn->ibc_queue_depth;
2486 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2487 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2488 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2489
2490 ackmsg = &conn->ibc_connvars->cv_msg;
2491 memset(ackmsg, 0, sizeof(*ackmsg));
2492
2493 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2494 sizeof(ackmsg->ibm_u.connparams));
2495 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2496 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2497 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2498
2499 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2500
2501 memset(&cp, 0, sizeof(cp));
2502 cp.private_data = ackmsg;
2503 cp.private_data_len = ackmsg->ibm_nob;
2504 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2505 cp.initiator_depth = 0;
2506 cp.flow_control = 1;
2507 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2508 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2509
2510 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2511
2512 rc = rdma_accept(cmid, &cp);
2513 if (rc) {
2514 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2515 rej.ibr_version = version;
2516 rej.ibr_why = IBLND_REJECT_FATAL;
2517
2518 kiblnd_reject(cmid, &rej);
2519 kiblnd_connreq_done(conn, rc);
2520 kiblnd_conn_decref(conn);
2521 }
2522
2523 lnet_ni_decref(ni);
2524 return 0;
2525
2526 failed:
2527 if (ni)
2528 lnet_ni_decref(ni);
2529
2530 rej.ibr_version = version;
2531 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2532 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2533 kiblnd_reject(cmid, &rej);
2534
2535 return -ECONNREFUSED;
2536 }
2537
2538 static void
2539 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2540 __u64 incarnation, int why, kib_connparams_t *cp)
2541 {
2542 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2543 kib_peer_t *peer = conn->ibc_peer;
2544 char *reason;
2545 int msg_size = IBLND_MSG_SIZE;
2546 int frag_num = -1;
2547 int queue_dep = -1;
2548 bool reconnect;
2549 unsigned long flags;
2550
2551 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2552 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2553 LASSERT(!peer->ibp_reconnecting);
2554
2555 if (cp) {
2556 msg_size = cp->ibcp_max_msg_size;
2557 frag_num = cp->ibcp_max_frags;
2558 queue_dep = cp->ibcp_queue_depth;
2559 }
2560
2561 write_lock_irqsave(glock, flags);
2562 /**
2563 * retry connection if it's still needed and no other connection
2564 * attempts (active or passive) are in progress
2565 * NB: reconnect is still needed even when ibp_tx_queue is
2566 * empty if ibp_version != version because reconnect may be
2567 * initiated by kiblnd_query()
2568 */
2569 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2570 peer->ibp_version != version) &&
2571 peer->ibp_connecting == 1 &&
2572 !peer->ibp_accepting;
2573 if (!reconnect) {
2574 reason = "no need";
2575 goto out;
2576 }
2577
2578 switch (why) {
2579 default:
2580 reason = "Unknown";
2581 break;
2582
2583 case IBLND_REJECT_RDMA_FRAGS:
2584 if (!cp) {
2585 reason = "can't negotiate max frags";
2586 goto out;
2587 }
2588 if (!*kiblnd_tunables.kib_map_on_demand) {
2589 reason = "map_on_demand must be enabled";
2590 goto out;
2591 }
2592 if (conn->ibc_max_frags <= frag_num) {
2593 reason = "unsupported max frags";
2594 goto out;
2595 }
2596
2597 peer->ibp_max_frags = frag_num;
2598 reason = "rdma fragments";
2599 break;
2600
2601 case IBLND_REJECT_MSG_QUEUE_SIZE:
2602 if (!cp) {
2603 reason = "can't negotiate queue depth";
2604 goto out;
2605 }
2606 if (conn->ibc_queue_depth <= queue_dep) {
2607 reason = "unsupported queue depth";
2608 goto out;
2609 }
2610
2611 peer->ibp_queue_depth = queue_dep;
2612 reason = "queue depth";
2613 break;
2614
2615 case IBLND_REJECT_CONN_STALE:
2616 reason = "stale";
2617 break;
2618
2619 case IBLND_REJECT_CONN_RACE:
2620 reason = "conn race";
2621 break;
2622
2623 case IBLND_REJECT_CONN_UNCOMPAT:
2624 reason = "version negotiation";
2625 break;
2626 }
2627
2628 conn->ibc_reconnect = 1;
2629 peer->ibp_reconnecting = 1;
2630 peer->ibp_version = version;
2631 if (incarnation)
2632 peer->ibp_incarnation = incarnation;
2633 out:
2634 write_unlock_irqrestore(glock, flags);
2635
2636 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2637 libcfs_nid2str(peer->ibp_nid),
2638 reconnect ? "reconnect" : "don't reconnect",
2639 reason, IBLND_MSG_VERSION, version, msg_size,
2640 conn->ibc_queue_depth, queue_dep,
2641 conn->ibc_max_frags, frag_num);
2642 /**
2643 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2644 * while destroying the zombie
2645 */
2646 }
2647
2648 static void
2649 kiblnd_rejected(kib_conn_t *conn, int reason, void *priv, int priv_nob)
2650 {
2651 kib_peer_t *peer = conn->ibc_peer;
2652
2653 LASSERT(!in_interrupt());
2654 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2655
2656 switch (reason) {
2657 case IB_CM_REJ_STALE_CONN:
2658 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2659 IBLND_REJECT_CONN_STALE, NULL);
2660 break;
2661
2662 case IB_CM_REJ_INVALID_SERVICE_ID:
2663 CNETERR("%s rejected: no listener at %d\n",
2664 libcfs_nid2str(peer->ibp_nid),
2665 *kiblnd_tunables.kib_service);
2666 break;
2667
2668 case IB_CM_REJ_CONSUMER_DEFINED:
2669 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2670 kib_rej_t *rej = priv;
2671 kib_connparams_t *cp = NULL;
2672 int flip = 0;
2673 __u64 incarnation = -1;
2674
2675 /* NB. default incarnation is -1 because:
2676 * a) V1 will ignore dst incarnation in connreq.
2677 * b) V2 will provide incarnation while rejecting me,
2678 * -1 will be overwrote.
2679 *
2680 * if I try to connect to a V1 peer with V2 protocol,
2681 * it rejected me then upgrade to V2, I have no idea
2682 * about the upgrading and try to reconnect with V1,
2683 * in this case upgraded V2 can find out I'm trying to
2684 * talk to the old guy and reject me(incarnation is -1).
2685 */
2686
2687 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2688 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2689 __swab32s(&rej->ibr_magic);
2690 __swab16s(&rej->ibr_version);
2691 flip = 1;
2692 }
2693
2694 if (priv_nob >= sizeof(kib_rej_t) &&
2695 rej->ibr_version > IBLND_MSG_VERSION_1) {
2696 /*
2697 * priv_nob is always 148 in current version
2698 * of OFED, so we still need to check version.
2699 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE)
2700 */
2701 cp = &rej->ibr_cp;
2702
2703 if (flip) {
2704 __swab64s(&rej->ibr_incarnation);
2705 __swab16s(&cp->ibcp_queue_depth);
2706 __swab16s(&cp->ibcp_max_frags);
2707 __swab32s(&cp->ibcp_max_msg_size);
2708 }
2709
2710 incarnation = rej->ibr_incarnation;
2711 }
2712
2713 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2714 rej->ibr_magic != LNET_PROTO_MAGIC) {
2715 CERROR("%s rejected: consumer defined fatal error\n",
2716 libcfs_nid2str(peer->ibp_nid));
2717 break;
2718 }
2719
2720 if (rej->ibr_version != IBLND_MSG_VERSION &&
2721 rej->ibr_version != IBLND_MSG_VERSION_1) {
2722 CERROR("%s rejected: o2iblnd version %x error\n",
2723 libcfs_nid2str(peer->ibp_nid),
2724 rej->ibr_version);
2725 break;
2726 }
2727
2728 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2729 rej->ibr_version == IBLND_MSG_VERSION_1) {
2730 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2731 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2732
2733 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2734 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2735 }
2736
2737 switch (rej->ibr_why) {
2738 case IBLND_REJECT_CONN_RACE:
2739 case IBLND_REJECT_CONN_STALE:
2740 case IBLND_REJECT_CONN_UNCOMPAT:
2741 case IBLND_REJECT_MSG_QUEUE_SIZE:
2742 case IBLND_REJECT_RDMA_FRAGS:
2743 kiblnd_check_reconnect(conn, rej->ibr_version,
2744 incarnation,
2745 rej->ibr_why, cp);
2746 break;
2747
2748 case IBLND_REJECT_NO_RESOURCES:
2749 CERROR("%s rejected: o2iblnd no resources\n",
2750 libcfs_nid2str(peer->ibp_nid));
2751 break;
2752
2753 case IBLND_REJECT_FATAL:
2754 CERROR("%s rejected: o2iblnd fatal error\n",
2755 libcfs_nid2str(peer->ibp_nid));
2756 break;
2757
2758 default:
2759 CERROR("%s rejected: o2iblnd reason %d\n",
2760 libcfs_nid2str(peer->ibp_nid),
2761 rej->ibr_why);
2762 break;
2763 }
2764 break;
2765 }
2766 /* fall through */
2767 default:
2768 CNETERR("%s rejected: reason %d, size %d\n",
2769 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2770 break;
2771 }
2772
2773 kiblnd_connreq_done(conn, -ECONNREFUSED);
2774 }
2775
2776 static void
2777 kiblnd_check_connreply(kib_conn_t *conn, void *priv, int priv_nob)
2778 {
2779 kib_peer_t *peer = conn->ibc_peer;
2780 lnet_ni_t *ni = peer->ibp_ni;
2781 kib_net_t *net = ni->ni_data;
2782 kib_msg_t *msg = priv;
2783 int ver = conn->ibc_version;
2784 int rc = kiblnd_unpack_msg(msg, priv_nob);
2785 unsigned long flags;
2786
2787 LASSERT(net);
2788
2789 if (rc) {
2790 CERROR("Can't unpack connack from %s: %d\n",
2791 libcfs_nid2str(peer->ibp_nid), rc);
2792 goto failed;
2793 }
2794
2795 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2796 CERROR("Unexpected message %d from %s\n",
2797 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2798 rc = -EPROTO;
2799 goto failed;
2800 }
2801
2802 if (ver != msg->ibm_version) {
2803 CERROR("%s replied version %x is different with requested version %x\n",
2804 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2805 rc = -EPROTO;
2806 goto failed;
2807 }
2808
2809 if (msg->ibm_u.connparams.ibcp_queue_depth >
2810 conn->ibc_queue_depth) {
2811 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2812 libcfs_nid2str(peer->ibp_nid),
2813 msg->ibm_u.connparams.ibcp_queue_depth,
2814 conn->ibc_queue_depth);
2815 rc = -EPROTO;
2816 goto failed;
2817 }
2818
2819 if (msg->ibm_u.connparams.ibcp_max_frags >
2820 conn->ibc_max_frags) {
2821 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2822 libcfs_nid2str(peer->ibp_nid),
2823 msg->ibm_u.connparams.ibcp_max_frags,
2824 conn->ibc_max_frags);
2825 rc = -EPROTO;
2826 goto failed;
2827 }
2828
2829 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2830 CERROR("%s max message size %d too big (%d max)\n",
2831 libcfs_nid2str(peer->ibp_nid),
2832 msg->ibm_u.connparams.ibcp_max_msg_size,
2833 IBLND_MSG_SIZE);
2834 rc = -EPROTO;
2835 goto failed;
2836 }
2837
2838 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2839 if (msg->ibm_dstnid == ni->ni_nid &&
2840 msg->ibm_dststamp == net->ibn_incarnation)
2841 rc = 0;
2842 else
2843 rc = -ESTALE;
2844 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2845
2846 if (rc) {
2847 CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
2848 libcfs_nid2str(peer->ibp_nid), rc,
2849 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2850 goto failed;
2851 }
2852
2853 conn->ibc_incarnation = msg->ibm_srcstamp;
2854 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2855 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2856 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2857 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2858 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2859 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2860
2861 kiblnd_connreq_done(conn, 0);
2862 return;
2863
2864 failed:
2865 /*
2866 * NB My QP has already established itself, so I handle anything going
2867 * wrong here by setting ibc_comms_error.
2868 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2869 * immediately tears it down.
2870 */
2871 LASSERT(rc);
2872 conn->ibc_comms_error = rc;
2873 kiblnd_connreq_done(conn, 0);
2874 }
2875
2876 static int
2877 kiblnd_active_connect(struct rdma_cm_id *cmid)
2878 {
2879 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2880 kib_conn_t *conn;
2881 kib_msg_t *msg;
2882 struct rdma_conn_param cp;
2883 int version;
2884 __u64 incarnation;
2885 unsigned long flags;
2886 int rc;
2887
2888 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2889
2890 incarnation = peer->ibp_incarnation;
2891 version = !peer->ibp_version ? IBLND_MSG_VERSION :
2892 peer->ibp_version;
2893
2894 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2895
2896 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2897 version);
2898 if (!conn) {
2899 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2900 kiblnd_peer_decref(peer); /* lose cmid's ref */
2901 return -ENOMEM;
2902 }
2903
2904 /*
2905 * conn "owns" cmid now, so I return success from here on to ensure the
2906 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2907 * on peer
2908 */
2909 msg = &conn->ibc_connvars->cv_msg;
2910
2911 memset(msg, 0, sizeof(*msg));
2912 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2913 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2914 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2915 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2916
2917 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2918 0, peer->ibp_nid, incarnation);
2919
2920 memset(&cp, 0, sizeof(cp));
2921 cp.private_data = msg;
2922 cp.private_data_len = msg->ibm_nob;
2923 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2924 cp.initiator_depth = 0;
2925 cp.flow_control = 1;
2926 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2927 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2928
2929 LASSERT(cmid->context == (void *)conn);
2930 LASSERT(conn->ibc_cmid == cmid);
2931
2932 rc = rdma_connect(cmid, &cp);
2933 if (rc) {
2934 CERROR("Can't connect to %s: %d\n",
2935 libcfs_nid2str(peer->ibp_nid), rc);
2936 kiblnd_connreq_done(conn, rc);
2937 kiblnd_conn_decref(conn);
2938 }
2939
2940 return 0;
2941 }
2942
2943 int
2944 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2945 {
2946 kib_peer_t *peer;
2947 kib_conn_t *conn;
2948 int rc;
2949
2950 switch (event->event) {
2951 default:
2952 CERROR("Unexpected event: %d, status: %d\n",
2953 event->event, event->status);
2954 LBUG();
2955
2956 case RDMA_CM_EVENT_CONNECT_REQUEST:
2957 /* destroy cmid on failure */
2958 rc = kiblnd_passive_connect(cmid,
2959 (void *)KIBLND_CONN_PARAM(event),
2960 KIBLND_CONN_PARAM_LEN(event));
2961 CDEBUG(D_NET, "connreq: %d\n", rc);
2962 return rc;
2963
2964 case RDMA_CM_EVENT_ADDR_ERROR:
2965 peer = (kib_peer_t *)cmid->context;
2966 CNETERR("%s: ADDR ERROR %d\n",
2967 libcfs_nid2str(peer->ibp_nid), event->status);
2968 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2969 kiblnd_peer_decref(peer);
2970 return -EHOSTUNREACH; /* rc destroys cmid */
2971
2972 case RDMA_CM_EVENT_ADDR_RESOLVED:
2973 peer = (kib_peer_t *)cmid->context;
2974
2975 CDEBUG(D_NET, "%s Addr resolved: %d\n",
2976 libcfs_nid2str(peer->ibp_nid), event->status);
2977
2978 if (event->status) {
2979 CNETERR("Can't resolve address for %s: %d\n",
2980 libcfs_nid2str(peer->ibp_nid), event->status);
2981 rc = event->status;
2982 } else {
2983 rc = rdma_resolve_route(
2984 cmid, *kiblnd_tunables.kib_timeout * 1000);
2985 if (!rc)
2986 return 0;
2987 /* Can't initiate route resolution */
2988 CERROR("Can't resolve route for %s: %d\n",
2989 libcfs_nid2str(peer->ibp_nid), rc);
2990 }
2991 kiblnd_peer_connect_failed(peer, 1, rc);
2992 kiblnd_peer_decref(peer);
2993 return rc; /* rc destroys cmid */
2994
2995 case RDMA_CM_EVENT_ROUTE_ERROR:
2996 peer = (kib_peer_t *)cmid->context;
2997 CNETERR("%s: ROUTE ERROR %d\n",
2998 libcfs_nid2str(peer->ibp_nid), event->status);
2999 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
3000 kiblnd_peer_decref(peer);
3001 return -EHOSTUNREACH; /* rc destroys cmid */
3002
3003 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3004 peer = (kib_peer_t *)cmid->context;
3005 CDEBUG(D_NET, "%s Route resolved: %d\n",
3006 libcfs_nid2str(peer->ibp_nid), event->status);
3007
3008 if (!event->status)
3009 return kiblnd_active_connect(cmid);
3010
3011 CNETERR("Can't resolve route for %s: %d\n",
3012 libcfs_nid2str(peer->ibp_nid), event->status);
3013 kiblnd_peer_connect_failed(peer, 1, event->status);
3014 kiblnd_peer_decref(peer);
3015 return event->status; /* rc destroys cmid */
3016
3017 case RDMA_CM_EVENT_UNREACHABLE:
3018 conn = (kib_conn_t *)cmid->context;
3019 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3020 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3021 CNETERR("%s: UNREACHABLE %d\n",
3022 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3023 kiblnd_connreq_done(conn, -ENETDOWN);
3024 kiblnd_conn_decref(conn);
3025 return 0;
3026
3027 case RDMA_CM_EVENT_CONNECT_ERROR:
3028 conn = (kib_conn_t *)cmid->context;
3029 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3030 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3031 CNETERR("%s: CONNECT ERROR %d\n",
3032 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3033 kiblnd_connreq_done(conn, -ENOTCONN);
3034 kiblnd_conn_decref(conn);
3035 return 0;
3036
3037 case RDMA_CM_EVENT_REJECTED:
3038 conn = (kib_conn_t *)cmid->context;
3039 switch (conn->ibc_state) {
3040 default:
3041 LBUG();
3042
3043 case IBLND_CONN_PASSIVE_WAIT:
3044 CERROR("%s: REJECTED %d\n",
3045 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3046 event->status);
3047 kiblnd_connreq_done(conn, -ECONNRESET);
3048 break;
3049
3050 case IBLND_CONN_ACTIVE_CONNECT:
3051 kiblnd_rejected(conn, event->status,
3052 (void *)KIBLND_CONN_PARAM(event),
3053 KIBLND_CONN_PARAM_LEN(event));
3054 break;
3055 }
3056 kiblnd_conn_decref(conn);
3057 return 0;
3058
3059 case RDMA_CM_EVENT_ESTABLISHED:
3060 conn = (kib_conn_t *)cmid->context;
3061 switch (conn->ibc_state) {
3062 default:
3063 LBUG();
3064
3065 case IBLND_CONN_PASSIVE_WAIT:
3066 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3067 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3068 kiblnd_connreq_done(conn, 0);
3069 break;
3070
3071 case IBLND_CONN_ACTIVE_CONNECT:
3072 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3073 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3074 kiblnd_check_connreply(conn,
3075 (void *)KIBLND_CONN_PARAM(event),
3076 KIBLND_CONN_PARAM_LEN(event));
3077 break;
3078 }
3079 /* net keeps its ref on conn! */
3080 return 0;
3081
3082 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3083 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3084 return 0;
3085 case RDMA_CM_EVENT_DISCONNECTED:
3086 conn = (kib_conn_t *)cmid->context;
3087 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3088 CERROR("%s DISCONNECTED\n",
3089 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3090 kiblnd_connreq_done(conn, -ECONNRESET);
3091 } else {
3092 kiblnd_close_conn(conn, 0);
3093 }
3094 kiblnd_conn_decref(conn);
3095 cmid->context = NULL;
3096 return 0;
3097
3098 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3099 LCONSOLE_ERROR_MSG(0x131,
3100 "Received notification of device removal\n"
3101 "Please shutdown LNET to allow this to proceed\n");
3102 /*
3103 * Can't remove network from underneath LNET for now, so I have
3104 * to ignore this
3105 */
3106 return 0;
3107
3108 case RDMA_CM_EVENT_ADDR_CHANGE:
3109 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3110 return 0;
3111 }
3112 }
3113
3114 static int
3115 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3116 {
3117 kib_tx_t *tx;
3118 struct list_head *ttmp;
3119
3120 list_for_each(ttmp, txs) {
3121 tx = list_entry(ttmp, kib_tx_t, tx_list);
3122
3123 if (txs != &conn->ibc_active_txs) {
3124 LASSERT(tx->tx_queued);
3125 } else {
3126 LASSERT(!tx->tx_queued);
3127 LASSERT(tx->tx_waiting || tx->tx_sending);
3128 }
3129
3130 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3131 CERROR("Timed out tx: %s, %lu seconds\n",
3132 kiblnd_queue2str(conn, txs),
3133 cfs_duration_sec(jiffies - tx->tx_deadline));
3134 return 1;
3135 }
3136 }
3137
3138 return 0;
3139 }
3140
3141 static int
3142 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3143 {
3144 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3145 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3146 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3147 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3148 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3149 }
3150
3151 static void
3152 kiblnd_check_conns(int idx)
3153 {
3154 LIST_HEAD(closes);
3155 LIST_HEAD(checksends);
3156 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3157 struct list_head *ptmp;
3158 kib_peer_t *peer;
3159 kib_conn_t *conn;
3160 kib_conn_t *temp;
3161 kib_conn_t *tmp;
3162 struct list_head *ctmp;
3163 unsigned long flags;
3164
3165 /*
3166 * NB. We expect to have a look at all the peers and not find any
3167 * RDMAs to time out, so we just use a shared lock while we
3168 * take a look...
3169 */
3170 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3171
3172 list_for_each(ptmp, peers) {
3173 peer = list_entry(ptmp, kib_peer_t, ibp_list);
3174
3175 list_for_each(ctmp, &peer->ibp_conns) {
3176 int timedout;
3177 int sendnoop;
3178
3179 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3180
3181 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3182
3183 spin_lock(&conn->ibc_lock);
3184
3185 sendnoop = kiblnd_need_noop(conn);
3186 timedout = kiblnd_conn_timed_out_locked(conn);
3187 if (!sendnoop && !timedout) {
3188 spin_unlock(&conn->ibc_lock);
3189 continue;
3190 }
3191
3192 if (timedout) {
3193 CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
3194 libcfs_nid2str(peer->ibp_nid),
3195 cfs_duration_sec(cfs_time_current() -
3196 peer->ibp_last_alive),
3197 conn->ibc_credits,
3198 conn->ibc_outstanding_credits,
3199 conn->ibc_reserved_credits);
3200 list_add(&conn->ibc_connd_list, &closes);
3201 } else {
3202 list_add(&conn->ibc_connd_list, &checksends);
3203 }
3204 /* +ref for 'closes' or 'checksends' */
3205 kiblnd_conn_addref(conn);
3206
3207 spin_unlock(&conn->ibc_lock);
3208 }
3209 }
3210
3211 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3212
3213 /*
3214 * Handle timeout by closing the whole
3215 * connection. We can only be sure RDMA activity
3216 * has ceased once the QP has been modified.
3217 */
3218 list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
3219 list_del(&conn->ibc_connd_list);
3220 kiblnd_close_conn(conn, -ETIMEDOUT);
3221 kiblnd_conn_decref(conn);
3222 }
3223
3224 /*
3225 * In case we have enough credits to return via a
3226 * NOOP, but there were no non-blocking tx descs
3227 * free to do it last time...
3228 */
3229 list_for_each_entry_safe(conn, temp, &checksends, ibc_connd_list) {
3230 list_del(&conn->ibc_connd_list);
3231 kiblnd_check_sends(conn);
3232 kiblnd_conn_decref(conn);
3233 }
3234 }
3235
3236 static void
3237 kiblnd_disconnect_conn(kib_conn_t *conn)
3238 {
3239 LASSERT(!in_interrupt());
3240 LASSERT(current == kiblnd_data.kib_connd);
3241 LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
3242
3243 rdma_disconnect(conn->ibc_cmid);
3244 kiblnd_finalise_conn(conn);
3245
3246 kiblnd_peer_notify(conn->ibc_peer);
3247 }
3248
3249 /**
3250 * High-water for reconnection to the same peer, reconnection attempt should
3251 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3252 */
3253 #define KIB_RECONN_HIGH_RACE 10
3254 /**
3255 * Allow connd to take a break and handle other things after consecutive
3256 * reconnection attemps.
3257 */
3258 #define KIB_RECONN_BREAK 100
3259
3260 int
3261 kiblnd_connd(void *arg)
3262 {
3263 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3264 wait_queue_t wait;
3265 unsigned long flags;
3266 kib_conn_t *conn;
3267 int timeout;
3268 int i;
3269 int dropped_lock;
3270 int peer_index = 0;
3271 unsigned long deadline = jiffies;
3272
3273 cfs_block_allsigs();
3274
3275 init_waitqueue_entry(&wait, current);
3276 kiblnd_data.kib_connd = current;
3277
3278 spin_lock_irqsave(lock, flags);
3279
3280 while (!kiblnd_data.kib_shutdown) {
3281 int reconn = 0;
3282
3283 dropped_lock = 0;
3284
3285 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3286 kib_peer_t *peer = NULL;
3287
3288 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3289 kib_conn_t, ibc_list);
3290 list_del(&conn->ibc_list);
3291 if (conn->ibc_reconnect) {
3292 peer = conn->ibc_peer;
3293 kiblnd_peer_addref(peer);
3294 }
3295
3296 spin_unlock_irqrestore(lock, flags);
3297 dropped_lock = 1;
3298
3299 kiblnd_destroy_conn(conn, !peer);
3300
3301 spin_lock_irqsave(lock, flags);
3302 if (!peer)
3303 continue;
3304
3305 conn->ibc_peer = peer;
3306 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3307 list_add_tail(&conn->ibc_list,
3308 &kiblnd_data.kib_reconn_list);
3309 else
3310 list_add_tail(&conn->ibc_list,
3311 &kiblnd_data.kib_reconn_wait);
3312 }
3313
3314 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3315 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3316 kib_conn_t, ibc_list);
3317 list_del(&conn->ibc_list);
3318
3319 spin_unlock_irqrestore(lock, flags);
3320 dropped_lock = 1;
3321
3322 kiblnd_disconnect_conn(conn);
3323 kiblnd_conn_decref(conn);
3324
3325 spin_lock_irqsave(lock, flags);
3326 }
3327
3328 while (reconn < KIB_RECONN_BREAK) {
3329 if (kiblnd_data.kib_reconn_sec !=
3330 ktime_get_real_seconds()) {
3331 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3332 list_splice_init(&kiblnd_data.kib_reconn_wait,
3333 &kiblnd_data.kib_reconn_list);
3334 }
3335
3336 if (list_empty(&kiblnd_data.kib_reconn_list))
3337 break;
3338
3339 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3340 kib_conn_t, ibc_list);
3341 list_del(&conn->ibc_list);
3342
3343 spin_unlock_irqrestore(lock, flags);
3344 dropped_lock = 1;
3345
3346 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3347 kiblnd_peer_decref(conn->ibc_peer);
3348 LIBCFS_FREE(conn, sizeof(*conn));
3349
3350 spin_lock_irqsave(lock, flags);
3351 }
3352
3353 /* careful with the jiffy wrap... */
3354 timeout = (int)(deadline - jiffies);
3355 if (timeout <= 0) {
3356 const int n = 4;
3357 const int p = 1;
3358 int chunk = kiblnd_data.kib_peer_hash_size;
3359
3360 spin_unlock_irqrestore(lock, flags);
3361 dropped_lock = 1;
3362
3363 /*
3364 * Time to check for RDMA timeouts on a few more
3365 * peers: I do checks every 'p' seconds on a
3366 * proportion of the peer table and I need to check
3367 * every connection 'n' times within a timeout
3368 * interval, to ensure I detect a timeout on any
3369 * connection within (n+1)/n times the timeout
3370 * interval.
3371 */
3372 if (*kiblnd_tunables.kib_timeout > n * p)
3373 chunk = (chunk * n * p) /
3374 *kiblnd_tunables.kib_timeout;
3375 if (!chunk)
3376 chunk = 1;
3377
3378 for (i = 0; i < chunk; i++) {
3379 kiblnd_check_conns(peer_index);
3380 peer_index = (peer_index + 1) %
3381 kiblnd_data.kib_peer_hash_size;
3382 }
3383
3384 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3385 spin_lock_irqsave(lock, flags);
3386 }
3387
3388 if (dropped_lock)
3389 continue;
3390
3391 /* Nothing to do for 'timeout' */
3392 set_current_state(TASK_INTERRUPTIBLE);
3393 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3394 spin_unlock_irqrestore(lock, flags);
3395
3396 schedule_timeout(timeout);
3397
3398 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3399 spin_lock_irqsave(lock, flags);
3400 }
3401
3402 spin_unlock_irqrestore(lock, flags);
3403
3404 kiblnd_thread_fini();
3405 return 0;
3406 }
3407
3408 void
3409 kiblnd_qp_event(struct ib_event *event, void *arg)
3410 {
3411 kib_conn_t *conn = arg;
3412
3413 switch (event->event) {
3414 case IB_EVENT_COMM_EST:
3415 CDEBUG(D_NET, "%s established\n",
3416 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3417 return;
3418
3419 default:
3420 CERROR("%s: Async QP event type %d\n",
3421 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3422 return;
3423 }
3424 }
3425
3426 static void
3427 kiblnd_complete(struct ib_wc *wc)
3428 {
3429 switch (kiblnd_wreqid2type(wc->wr_id)) {
3430 default:
3431 LBUG();
3432
3433 case IBLND_WID_RDMA:
3434 /*
3435 * We only get RDMA completion notification if it fails. All
3436 * subsequent work items, including the final SEND will fail
3437 * too. However we can't print out any more info about the
3438 * failing RDMA because 'tx' might be back on the idle list or
3439 * even reused already if we didn't manage to post all our work
3440 * items
3441 */
3442 CNETERR("RDMA (tx: %p) failed: %d\n",
3443 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3444 return;
3445
3446 case IBLND_WID_TX:
3447 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3448 return;
3449
3450 case IBLND_WID_RX:
3451 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3452 wc->byte_len);
3453 return;
3454 }
3455 }
3456
3457 void
3458 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3459 {
3460 /*
3461 * NB I'm not allowed to schedule this conn once its refcount has
3462 * reached 0. Since fundamentally I'm racing with scheduler threads
3463 * consuming my CQ I could be called after all completions have
3464 * occurred. But in this case, !ibc_nrx && !ibc_nsends_posted
3465 * and this CQ is about to be destroyed so I NOOP.
3466 */
3467 kib_conn_t *conn = arg;
3468 struct kib_sched_info *sched = conn->ibc_sched;
3469 unsigned long flags;
3470
3471 LASSERT(cq == conn->ibc_cq);
3472
3473 spin_lock_irqsave(&sched->ibs_lock, flags);
3474
3475 conn->ibc_ready = 1;
3476
3477 if (!conn->ibc_scheduled &&
3478 (conn->ibc_nrx > 0 ||
3479 conn->ibc_nsends_posted > 0)) {
3480 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3481 conn->ibc_scheduled = 1;
3482 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3483
3484 if (waitqueue_active(&sched->ibs_waitq))
3485 wake_up(&sched->ibs_waitq);
3486 }
3487
3488 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3489 }
3490
3491 void
3492 kiblnd_cq_event(struct ib_event *event, void *arg)
3493 {
3494 kib_conn_t *conn = arg;
3495
3496 CERROR("%s: async CQ event type %d\n",
3497 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3498 }
3499
3500 int
3501 kiblnd_scheduler(void *arg)
3502 {
3503 long id = (long)arg;
3504 struct kib_sched_info *sched;
3505 kib_conn_t *conn;
3506 wait_queue_t wait;
3507 unsigned long flags;
3508 struct ib_wc wc;
3509 int did_something;
3510 int busy_loops = 0;
3511 int rc;
3512
3513 cfs_block_allsigs();
3514
3515 init_waitqueue_entry(&wait, current);
3516
3517 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3518
3519 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3520 if (rc) {
3521 CWARN("Failed to bind on CPT %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n",
3522 sched->ibs_cpt);
3523 }
3524
3525 spin_lock_irqsave(&sched->ibs_lock, flags);
3526
3527 while (!kiblnd_data.kib_shutdown) {
3528 if (busy_loops++ >= IBLND_RESCHED) {
3529 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3530
3531 cond_resched();
3532 busy_loops = 0;
3533
3534 spin_lock_irqsave(&sched->ibs_lock, flags);
3535 }
3536
3537 did_something = 0;
3538
3539 if (!list_empty(&sched->ibs_conns)) {
3540 conn = list_entry(sched->ibs_conns.next, kib_conn_t,
3541 ibc_sched_list);
3542 /* take over kib_sched_conns' ref on conn... */
3543 LASSERT(conn->ibc_scheduled);
3544 list_del(&conn->ibc_sched_list);
3545 conn->ibc_ready = 0;
3546
3547 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3548
3549 wc.wr_id = IBLND_WID_INVAL;
3550
3551 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3552 if (!rc) {
3553 rc = ib_req_notify_cq(conn->ibc_cq,
3554 IB_CQ_NEXT_COMP);
3555 if (rc < 0) {
3556 CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
3557 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3558 kiblnd_close_conn(conn, -EIO);
3559 kiblnd_conn_decref(conn);
3560 spin_lock_irqsave(&sched->ibs_lock,
3561 flags);
3562 continue;
3563 }
3564
3565 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3566 }
3567
3568 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3569 LCONSOLE_ERROR("ib_poll_cq (rc: %d) returned invalid wr_id, opcode %d, status: %d, vendor_err: %d, conn: %s status: %d\nplease upgrade firmware and OFED or contact vendor.\n",
3570 rc, wc.opcode, wc.status,
3571 wc.vendor_err,
3572 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3573 conn->ibc_state);
3574 rc = -EINVAL;
3575 }
3576
3577 if (rc < 0) {
3578 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
3579 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3580 rc);
3581 kiblnd_close_conn(conn, -EIO);
3582 kiblnd_conn_decref(conn);
3583 spin_lock_irqsave(&sched->ibs_lock, flags);
3584 continue;
3585 }
3586
3587 spin_lock_irqsave(&sched->ibs_lock, flags);
3588
3589 if (rc || conn->ibc_ready) {
3590 /*
3591 * There may be another completion waiting; get
3592 * another scheduler to check while I handle
3593 * this one...
3594 */
3595 /* +1 ref for sched_conns */
3596 kiblnd_conn_addref(conn);
3597 list_add_tail(&conn->ibc_sched_list,
3598 &sched->ibs_conns);
3599 if (waitqueue_active(&sched->ibs_waitq))
3600 wake_up(&sched->ibs_waitq);
3601 } else {
3602 conn->ibc_scheduled = 0;
3603 }
3604
3605 if (rc) {
3606 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3607 kiblnd_complete(&wc);
3608
3609 spin_lock_irqsave(&sched->ibs_lock, flags);
3610 }
3611
3612 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3613 did_something = 1;
3614 }
3615
3616 if (did_something)
3617 continue;
3618
3619 set_current_state(TASK_INTERRUPTIBLE);
3620 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3621 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3622
3623 schedule();
3624 busy_loops = 0;
3625
3626 remove_wait_queue(&sched->ibs_waitq, &wait);
3627 spin_lock_irqsave(&sched->ibs_lock, flags);
3628 }
3629
3630 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3631
3632 kiblnd_thread_fini();
3633 return 0;
3634 }
3635
3636 int
3637 kiblnd_failover_thread(void *arg)
3638 {
3639 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3640 kib_dev_t *dev;
3641 wait_queue_t wait;
3642 unsigned long flags;
3643 int rc;
3644
3645 LASSERT(*kiblnd_tunables.kib_dev_failover);
3646
3647 cfs_block_allsigs();
3648
3649 init_waitqueue_entry(&wait, current);
3650 write_lock_irqsave(glock, flags);
3651
3652 while (!kiblnd_data.kib_shutdown) {
3653 int do_failover = 0;
3654 int long_sleep;
3655
3656 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3657 ibd_fail_list) {
3658 if (time_before(cfs_time_current(),
3659 dev->ibd_next_failover))
3660 continue;
3661 do_failover = 1;
3662 break;
3663 }
3664
3665 if (do_failover) {
3666 list_del_init(&dev->ibd_fail_list);
3667 dev->ibd_failover = 1;
3668 write_unlock_irqrestore(glock, flags);
3669
3670 rc = kiblnd_dev_failover(dev);
3671
3672 write_lock_irqsave(glock, flags);
3673
3674 LASSERT(dev->ibd_failover);
3675 dev->ibd_failover = 0;
3676 if (rc >= 0) { /* Device is OK or failover succeed */
3677 dev->ibd_next_failover = cfs_time_shift(3);
3678 continue;
3679 }
3680
3681 /* failed to failover, retry later */
3682 dev->ibd_next_failover =
3683 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3684 if (kiblnd_dev_can_failover(dev)) {
3685 list_add_tail(&dev->ibd_fail_list,
3686 &kiblnd_data.kib_failed_devs);
3687 }
3688
3689 continue;
3690 }
3691
3692 /* long sleep if no more pending failover */
3693 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3694
3695 set_current_state(TASK_INTERRUPTIBLE);
3696 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3697 write_unlock_irqrestore(glock, flags);
3698
3699 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3700 cfs_time_seconds(1));
3701 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3702 write_lock_irqsave(glock, flags);
3703
3704 if (!long_sleep || rc)
3705 continue;
3706
3707 /*
3708 * have a long sleep, routine check all active devices,
3709 * we need checking like this because if there is not active
3710 * connection on the dev and no SEND from local, we may listen
3711 * on wrong HCA for ever while there is a bonding failover
3712 */
3713 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3714 if (kiblnd_dev_can_failover(dev)) {
3715 list_add_tail(&dev->ibd_fail_list,
3716 &kiblnd_data.kib_failed_devs);
3717 }
3718 }
3719 }
3720
3721 write_unlock_irqrestore(glock, flags);
3722
3723 kiblnd_thread_fini();
3724 return 0;
3725 }
Linux kernel - Deliverables
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