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Merge tag 'trace-fixes-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[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, 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 void
44 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
45 {
46 lnet_msg_t *lntmsg[2];
47 kib_net_t *net = ni->ni_data;
48 int rc;
49 int i;
50
51 LASSERT (net != NULL);
52 LASSERT (!in_interrupt());
53 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
54 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
55 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
56 LASSERT (tx->tx_pool != NULL);
57
58 kiblnd_unmap_tx(ni, tx);
59
60 /* tx may have up to 2 lnet msgs to finalise */
61 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
62 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
63 rc = tx->tx_status;
64
65 if (tx->tx_conn != NULL) {
66 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
67
68 kiblnd_conn_decref(tx->tx_conn);
69 tx->tx_conn = NULL;
70 }
71
72 tx->tx_nwrq = 0;
73 tx->tx_status = 0;
74
75 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
76
77 /* delay finalize until my descs have been freed */
78 for (i = 0; i < 2; i++) {
79 if (lntmsg[i] == NULL)
80 continue;
81
82 lnet_finalize(ni, lntmsg[i], rc);
83 }
84 }
85
86 void
87 kiblnd_txlist_done (lnet_ni_t *ni, struct list_head *txlist, int status)
88 {
89 kib_tx_t *tx;
90
91 while (!list_empty (txlist)) {
92 tx = list_entry (txlist->next, kib_tx_t, tx_list);
93
94 list_del(&tx->tx_list);
95 /* complete now */
96 tx->tx_waiting = 0;
97 tx->tx_status = status;
98 kiblnd_tx_done(ni, tx);
99 }
100 }
101
102 kib_tx_t *
103 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
104 {
105 kib_net_t *net = (kib_net_t *)ni->ni_data;
106 struct list_head *node;
107 kib_tx_t *tx;
108 kib_tx_poolset_t *tps;
109
110 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
111 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
112 if (node == NULL)
113 return NULL;
114 tx = container_of(node, kib_tx_t, tx_list);
115
116 LASSERT (tx->tx_nwrq == 0);
117 LASSERT (!tx->tx_queued);
118 LASSERT (tx->tx_sending == 0);
119 LASSERT (!tx->tx_waiting);
120 LASSERT (tx->tx_status == 0);
121 LASSERT (tx->tx_conn == NULL);
122 LASSERT (tx->tx_lntmsg[0] == NULL);
123 LASSERT (tx->tx_lntmsg[1] == NULL);
124 LASSERT (tx->tx_u.pmr == NULL);
125 LASSERT (tx->tx_nfrags == 0);
126
127 return tx;
128 }
129
130 void
131 kiblnd_drop_rx(kib_rx_t *rx)
132 {
133 kib_conn_t *conn = rx->rx_conn;
134 struct kib_sched_info *sched = conn->ibc_sched;
135 unsigned long flags;
136
137 spin_lock_irqsave(&sched->ibs_lock, flags);
138 LASSERT(conn->ibc_nrx > 0);
139 conn->ibc_nrx--;
140 spin_unlock_irqrestore(&sched->ibs_lock, flags);
141
142 kiblnd_conn_decref(conn);
143 }
144
145 int
146 kiblnd_post_rx (kib_rx_t *rx, int credit)
147 {
148 kib_conn_t *conn = rx->rx_conn;
149 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
150 struct ib_recv_wr *bad_wrq = NULL;
151 struct ib_mr *mr;
152 int rc;
153
154 LASSERT (net != NULL);
155 LASSERT (!in_interrupt());
156 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
157 credit == IBLND_POSTRX_PEER_CREDIT ||
158 credit == IBLND_POSTRX_RSRVD_CREDIT);
159
160 mr = kiblnd_find_dma_mr(conn->ibc_hdev, rx->rx_msgaddr, IBLND_MSG_SIZE);
161 LASSERT (mr != NULL);
162
163 rx->rx_sge.lkey = mr->lkey;
164 rx->rx_sge.addr = rx->rx_msgaddr;
165 rx->rx_sge.length = IBLND_MSG_SIZE;
166
167 rx->rx_wrq.next = NULL;
168 rx->rx_wrq.sg_list = &rx->rx_sge;
169 rx->rx_wrq.num_sge = 1;
170 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
171
172 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
173 LASSERT (rx->rx_nob >= 0); /* not posted */
174
175 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
176 kiblnd_drop_rx(rx); /* No more posts for this rx */
177 return 0;
178 }
179
180 rx->rx_nob = -1; /* flag posted */
181
182 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
183 if (rc != 0) {
184 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
185 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
186 rx->rx_nob = 0;
187 }
188
189 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
190 return rc;
191
192 if (rc != 0) {
193 kiblnd_close_conn(conn, rc);
194 kiblnd_drop_rx(rx); /* No more posts for this rx */
195 return rc;
196 }
197
198 if (credit == IBLND_POSTRX_NO_CREDIT)
199 return 0;
200
201 spin_lock(&conn->ibc_lock);
202 if (credit == IBLND_POSTRX_PEER_CREDIT)
203 conn->ibc_outstanding_credits++;
204 else
205 conn->ibc_reserved_credits++;
206 spin_unlock(&conn->ibc_lock);
207
208 kiblnd_check_sends(conn);
209 return 0;
210 }
211
212 kib_tx_t *
213 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
214 {
215 struct list_head *tmp;
216
217 list_for_each(tmp, &conn->ibc_active_txs) {
218 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
219
220 LASSERT (!tx->tx_queued);
221 LASSERT (tx->tx_sending != 0 || tx->tx_waiting);
222
223 if (tx->tx_cookie != cookie)
224 continue;
225
226 if (tx->tx_waiting &&
227 tx->tx_msg->ibm_type == txtype)
228 return tx;
229
230 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
231 tx->tx_waiting ? "" : "NOT ",
232 tx->tx_msg->ibm_type, txtype);
233 }
234 return NULL;
235 }
236
237 void
238 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
239 {
240 kib_tx_t *tx;
241 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
242 int idle;
243
244 spin_lock(&conn->ibc_lock);
245
246 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
247 if (tx == NULL) {
248 spin_unlock(&conn->ibc_lock);
249
250 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
251 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
252 kiblnd_close_conn(conn, -EPROTO);
253 return;
254 }
255
256 if (tx->tx_status == 0) { /* success so far */
257 if (status < 0) { /* failed? */
258 tx->tx_status = status;
259 } else if (txtype == IBLND_MSG_GET_REQ) {
260 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
261 }
262 }
263
264 tx->tx_waiting = 0;
265
266 idle = !tx->tx_queued && (tx->tx_sending == 0);
267 if (idle)
268 list_del(&tx->tx_list);
269
270 spin_unlock(&conn->ibc_lock);
271
272 if (idle)
273 kiblnd_tx_done(ni, tx);
274 }
275
276 void
277 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
278 {
279 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
280 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
281
282 if (tx == NULL) {
283 CERROR("Can't get tx for completion %x for %s\n",
284 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
285 return;
286 }
287
288 tx->tx_msg->ibm_u.completion.ibcm_status = status;
289 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
290 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
291
292 kiblnd_queue_tx(tx, conn);
293 }
294
295 void
296 kiblnd_handle_rx (kib_rx_t *rx)
297 {
298 kib_msg_t *msg = rx->rx_msg;
299 kib_conn_t *conn = rx->rx_conn;
300 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
301 int credits = msg->ibm_credits;
302 kib_tx_t *tx;
303 int rc = 0;
304 int rc2;
305 int post_credit;
306
307 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
308
309 CDEBUG (D_NET, "Received %x[%d] from %s\n",
310 msg->ibm_type, credits,
311 libcfs_nid2str(conn->ibc_peer->ibp_nid));
312
313 if (credits != 0) {
314 /* Have I received credits that will let me send? */
315 spin_lock(&conn->ibc_lock);
316
317 if (conn->ibc_credits + credits >
318 IBLND_MSG_QUEUE_SIZE(conn->ibc_version)) {
319 rc2 = conn->ibc_credits;
320 spin_unlock(&conn->ibc_lock);
321
322 CERROR("Bad credits from %s: %d + %d > %d\n",
323 libcfs_nid2str(conn->ibc_peer->ibp_nid),
324 rc2, credits,
325 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
326
327 kiblnd_close_conn(conn, -EPROTO);
328 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
329 return;
330 }
331
332 conn->ibc_credits += credits;
333
334 /* This ensures the credit taken by NOOP can be returned */
335 if (msg->ibm_type == IBLND_MSG_NOOP &&
336 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
337 conn->ibc_outstanding_credits++;
338
339 spin_unlock(&conn->ibc_lock);
340 kiblnd_check_sends(conn);
341 }
342
343 switch (msg->ibm_type) {
344 default:
345 CERROR("Bad IBLND message type %x from %s\n",
346 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
347 post_credit = IBLND_POSTRX_NO_CREDIT;
348 rc = -EPROTO;
349 break;
350
351 case IBLND_MSG_NOOP:
352 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
353 post_credit = IBLND_POSTRX_NO_CREDIT;
354 break;
355 }
356
357 if (credits != 0) /* credit already posted */
358 post_credit = IBLND_POSTRX_NO_CREDIT;
359 else /* a keepalive NOOP */
360 post_credit = IBLND_POSTRX_PEER_CREDIT;
361 break;
362
363 case IBLND_MSG_IMMEDIATE:
364 post_credit = IBLND_POSTRX_DONT_POST;
365 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
366 msg->ibm_srcnid, rx, 0);
367 if (rc < 0) /* repost on error */
368 post_credit = IBLND_POSTRX_PEER_CREDIT;
369 break;
370
371 case IBLND_MSG_PUT_REQ:
372 post_credit = IBLND_POSTRX_DONT_POST;
373 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
374 msg->ibm_srcnid, rx, 1);
375 if (rc < 0) /* repost on error */
376 post_credit = IBLND_POSTRX_PEER_CREDIT;
377 break;
378
379 case IBLND_MSG_PUT_NAK:
380 CWARN ("PUT_NACK from %s\n",
381 libcfs_nid2str(conn->ibc_peer->ibp_nid));
382 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
383 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
384 msg->ibm_u.completion.ibcm_status,
385 msg->ibm_u.completion.ibcm_cookie);
386 break;
387
388 case IBLND_MSG_PUT_ACK:
389 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
390
391 spin_lock(&conn->ibc_lock);
392 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
393 msg->ibm_u.putack.ibpam_src_cookie);
394 if (tx != NULL)
395 list_del(&tx->tx_list);
396 spin_unlock(&conn->ibc_lock);
397
398 if (tx == NULL) {
399 CERROR("Unmatched PUT_ACK from %s\n",
400 libcfs_nid2str(conn->ibc_peer->ibp_nid));
401 rc = -EPROTO;
402 break;
403 }
404
405 LASSERT (tx->tx_waiting);
406 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
407 * (a) I can overwrite tx_msg since my peer has received it!
408 * (b) tx_waiting set tells tx_complete() it's not done. */
409
410 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
411
412 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
413 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
414 &msg->ibm_u.putack.ibpam_rd,
415 msg->ibm_u.putack.ibpam_dst_cookie);
416 if (rc2 < 0)
417 CERROR("Can't setup rdma for PUT to %s: %d\n",
418 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
419
420 spin_lock(&conn->ibc_lock);
421 tx->tx_waiting = 0; /* clear waiting and queue atomically */
422 kiblnd_queue_tx_locked(tx, conn);
423 spin_unlock(&conn->ibc_lock);
424 break;
425
426 case IBLND_MSG_PUT_DONE:
427 post_credit = IBLND_POSTRX_PEER_CREDIT;
428 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
429 msg->ibm_u.completion.ibcm_status,
430 msg->ibm_u.completion.ibcm_cookie);
431 break;
432
433 case IBLND_MSG_GET_REQ:
434 post_credit = IBLND_POSTRX_DONT_POST;
435 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
436 msg->ibm_srcnid, rx, 1);
437 if (rc < 0) /* repost on error */
438 post_credit = IBLND_POSTRX_PEER_CREDIT;
439 break;
440
441 case IBLND_MSG_GET_DONE:
442 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
443 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
444 msg->ibm_u.completion.ibcm_status,
445 msg->ibm_u.completion.ibcm_cookie);
446 break;
447 }
448
449 if (rc < 0) /* protocol error */
450 kiblnd_close_conn(conn, rc);
451
452 if (post_credit != IBLND_POSTRX_DONT_POST)
453 kiblnd_post_rx(rx, post_credit);
454 }
455
456 void
457 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
458 {
459 kib_msg_t *msg = rx->rx_msg;
460 kib_conn_t *conn = rx->rx_conn;
461 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
462 kib_net_t *net = ni->ni_data;
463 int rc;
464 int err = -EIO;
465
466 LASSERT (net != NULL);
467 LASSERT (rx->rx_nob < 0); /* was posted */
468 rx->rx_nob = 0; /* isn't now */
469
470 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
471 goto ignore;
472
473 if (status != IB_WC_SUCCESS) {
474 CNETERR("Rx from %s failed: %d\n",
475 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
476 goto failed;
477 }
478
479 LASSERT (nob >= 0);
480 rx->rx_nob = nob;
481
482 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
483 if (rc != 0) {
484 CERROR ("Error %d unpacking rx from %s\n",
485 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
486 goto failed;
487 }
488
489 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
490 msg->ibm_dstnid != ni->ni_nid ||
491 msg->ibm_srcstamp != conn->ibc_incarnation ||
492 msg->ibm_dststamp != net->ibn_incarnation) {
493 CERROR ("Stale rx from %s\n",
494 libcfs_nid2str(conn->ibc_peer->ibp_nid));
495 err = -ESTALE;
496 goto failed;
497 }
498
499 /* set time last known alive */
500 kiblnd_peer_alive(conn->ibc_peer);
501
502 /* racing with connection establishment/teardown! */
503
504 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
505 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
506 unsigned long flags;
507
508 write_lock_irqsave(g_lock, flags);
509 /* must check holding global lock to eliminate race */
510 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
511 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
512 write_unlock_irqrestore(g_lock, flags);
513 return;
514 }
515 write_unlock_irqrestore(g_lock, flags);
516 }
517 kiblnd_handle_rx(rx);
518 return;
519
520 failed:
521 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
522 kiblnd_close_conn(conn, err);
523 ignore:
524 kiblnd_drop_rx(rx); /* Don't re-post rx. */
525 }
526
527 struct page *
528 kiblnd_kvaddr_to_page (unsigned long vaddr)
529 {
530 struct page *page;
531
532 if (is_vmalloc_addr(vaddr)) {
533 page = vmalloc_to_page ((void *)vaddr);
534 LASSERT (page != NULL);
535 return page;
536 }
537 #ifdef CONFIG_HIGHMEM
538 if (vaddr >= PKMAP_BASE &&
539 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
540 /* No highmem pages only used for bulk (kiov) I/O */
541 CERROR("find page for address in highmem\n");
542 LBUG();
543 }
544 #endif
545 page = virt_to_page (vaddr);
546 LASSERT (page != NULL);
547 return page;
548 }
549
550 static int
551 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
552 {
553 kib_hca_dev_t *hdev;
554 __u64 *pages = tx->tx_pages;
555 kib_fmr_poolset_t *fps;
556 int npages;
557 int size;
558 int cpt;
559 int rc;
560 int i;
561
562 LASSERT(tx->tx_pool != NULL);
563 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
564
565 hdev = tx->tx_pool->tpo_hdev;
566
567 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
568 for (size = 0; size < rd->rd_frags[i].rf_nob;
569 size += hdev->ibh_page_size) {
570 pages[npages ++] = (rd->rd_frags[i].rf_addr &
571 hdev->ibh_page_mask) + size;
572 }
573 }
574
575 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
576
577 fps = net->ibn_fmr_ps[cpt];
578 rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->tx_u.fmr);
579 if (rc != 0) {
580 CERROR ("Can't map %d pages: %d\n", npages, rc);
581 return rc;
582 }
583
584 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
585 * the rkey */
586 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
587 tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
588 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
589 rd->rd_frags[0].rf_nob = nob;
590 rd->rd_nfrags = 1;
591
592 return 0;
593 }
594
595 static int
596 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
597 {
598 kib_hca_dev_t *hdev;
599 kib_pmr_poolset_t *pps;
600 __u64 iova;
601 int cpt;
602 int rc;
603
604 LASSERT(tx->tx_pool != NULL);
605 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
606
607 hdev = tx->tx_pool->tpo_hdev;
608
609 iova = rd->rd_frags[0].rf_addr & ~hdev->ibh_page_mask;
610
611 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
612
613 pps = net->ibn_pmr_ps[cpt];
614 rc = kiblnd_pmr_pool_map(pps, hdev, rd, &iova, &tx->tx_u.pmr);
615 if (rc != 0) {
616 CERROR("Failed to create MR by phybuf: %d\n", rc);
617 return rc;
618 }
619
620 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
621 * the rkey */
622 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
623 tx->tx_u.pmr->pmr_mr->lkey;
624 rd->rd_nfrags = 1;
625 rd->rd_frags[0].rf_addr = iova;
626 rd->rd_frags[0].rf_nob = nob;
627
628 return 0;
629 }
630
631 void
632 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
633 {
634 kib_net_t *net = ni->ni_data;
635
636 LASSERT(net != NULL);
637
638 if (net->ibn_fmr_ps != NULL && tx->tx_u.fmr.fmr_pfmr != NULL) {
639 kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
640 tx->tx_u.fmr.fmr_pfmr = NULL;
641
642 } else if (net->ibn_pmr_ps != NULL && tx->tx_u.pmr != NULL) {
643 kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
644 tx->tx_u.pmr = NULL;
645 }
646
647 if (tx->tx_nfrags != 0) {
648 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
649 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
650 tx->tx_nfrags = 0;
651 }
652 }
653
654 int
655 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
656 kib_rdma_desc_t *rd, int nfrags)
657 {
658 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
659 kib_net_t *net = ni->ni_data;
660 struct ib_mr *mr = NULL;
661 __u32 nob;
662 int i;
663
664 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
665 * RDMA sink */
666 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
667 tx->tx_nfrags = nfrags;
668
669 rd->rd_nfrags =
670 kiblnd_dma_map_sg(hdev->ibh_ibdev,
671 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
672
673 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
674 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
675 hdev->ibh_ibdev, &tx->tx_frags[i]);
676 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
677 hdev->ibh_ibdev, &tx->tx_frags[i]);
678 nob += rd->rd_frags[i].rf_nob;
679 }
680
681 /* looking for pre-mapping MR */
682 mr = kiblnd_find_rd_dma_mr(hdev, rd);
683 if (mr != NULL) {
684 /* found pre-mapping MR */
685 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
686 return 0;
687 }
688
689 if (net->ibn_fmr_ps != NULL)
690 return kiblnd_fmr_map_tx(net, tx, rd, nob);
691 else if (net->ibn_pmr_ps != NULL)
692 return kiblnd_pmr_map_tx(net, tx, rd, nob);
693
694 return -EINVAL;
695 }
696
697
698 int
699 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
700 unsigned int niov, struct iovec *iov, int offset, int nob)
701 {
702 kib_net_t *net = ni->ni_data;
703 struct page *page;
704 struct scatterlist *sg;
705 unsigned long vaddr;
706 int fragnob;
707 int page_offset;
708
709 LASSERT (nob > 0);
710 LASSERT (niov > 0);
711 LASSERT (net != NULL);
712
713 while (offset >= iov->iov_len) {
714 offset -= iov->iov_len;
715 niov--;
716 iov++;
717 LASSERT (niov > 0);
718 }
719
720 sg = tx->tx_frags;
721 do {
722 LASSERT (niov > 0);
723
724 vaddr = ((unsigned long)iov->iov_base) + offset;
725 page_offset = vaddr & (PAGE_SIZE - 1);
726 page = kiblnd_kvaddr_to_page(vaddr);
727 if (page == NULL) {
728 CERROR ("Can't find page\n");
729 return -EFAULT;
730 }
731
732 fragnob = min((int)(iov->iov_len - offset), nob);
733 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
734
735 sg_set_page(sg, page, fragnob, page_offset);
736 sg++;
737
738 if (offset + fragnob < iov->iov_len) {
739 offset += fragnob;
740 } else {
741 offset = 0;
742 iov++;
743 niov--;
744 }
745 nob -= fragnob;
746 } while (nob > 0);
747
748 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
749 }
750
751 int
752 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
753 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
754 {
755 kib_net_t *net = ni->ni_data;
756 struct scatterlist *sg;
757 int fragnob;
758
759 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
760
761 LASSERT (nob > 0);
762 LASSERT (nkiov > 0);
763 LASSERT (net != NULL);
764
765 while (offset >= kiov->kiov_len) {
766 offset -= kiov->kiov_len;
767 nkiov--;
768 kiov++;
769 LASSERT (nkiov > 0);
770 }
771
772 sg = tx->tx_frags;
773 do {
774 LASSERT (nkiov > 0);
775
776 fragnob = min((int)(kiov->kiov_len - offset), nob);
777
778 sg_set_page(sg, kiov->kiov_page, fragnob,
779 kiov->kiov_offset + offset);
780 sg++;
781
782 offset = 0;
783 kiov++;
784 nkiov--;
785 nob -= fragnob;
786 } while (nob > 0);
787
788 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
789 }
790
791 int
792 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
793 {
794 kib_msg_t *msg = tx->tx_msg;
795 kib_peer_t *peer = conn->ibc_peer;
796 int ver = conn->ibc_version;
797 int rc;
798 int done;
799 struct ib_send_wr *bad_wrq;
800
801 LASSERT (tx->tx_queued);
802 /* We rely on this for QP sizing */
803 LASSERT (tx->tx_nwrq > 0);
804 LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
805
806 LASSERT (credit == 0 || credit == 1);
807 LASSERT (conn->ibc_outstanding_credits >= 0);
808 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
809 LASSERT (conn->ibc_credits >= 0);
810 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
811
812 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
813 /* tx completions outstanding... */
814 CDEBUG(D_NET, "%s: posted enough\n",
815 libcfs_nid2str(peer->ibp_nid));
816 return -EAGAIN;
817 }
818
819 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
820 CDEBUG(D_NET, "%s: no credits\n",
821 libcfs_nid2str(peer->ibp_nid));
822 return -EAGAIN;
823 }
824
825 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
826 conn->ibc_credits == 1 && /* last credit reserved */
827 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
828 CDEBUG(D_NET, "%s: not using last credit\n",
829 libcfs_nid2str(peer->ibp_nid));
830 return -EAGAIN;
831 }
832
833 /* NB don't drop ibc_lock before bumping tx_sending */
834 list_del(&tx->tx_list);
835 tx->tx_queued = 0;
836
837 if (msg->ibm_type == IBLND_MSG_NOOP &&
838 (!kiblnd_need_noop(conn) || /* redundant NOOP */
839 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
840 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
841 /* OK to drop when posted enough NOOPs, since
842 * kiblnd_check_sends will queue NOOP again when
843 * posted NOOPs complete */
844 spin_unlock(&conn->ibc_lock);
845 kiblnd_tx_done(peer->ibp_ni, tx);
846 spin_lock(&conn->ibc_lock);
847 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
848 libcfs_nid2str(peer->ibp_nid),
849 conn->ibc_noops_posted);
850 return 0;
851 }
852
853 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
854 peer->ibp_nid, conn->ibc_incarnation);
855
856 conn->ibc_credits -= credit;
857 conn->ibc_outstanding_credits = 0;
858 conn->ibc_nsends_posted++;
859 if (msg->ibm_type == IBLND_MSG_NOOP)
860 conn->ibc_noops_posted++;
861
862 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
863 * PUT. If so, it was first queued here as a PUT_REQ, sent and
864 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
865 * and then re-queued here. It's (just) possible that
866 * tx_sending is non-zero if we've not done the tx_complete()
867 * from the first send; hence the ++ rather than = below. */
868 tx->tx_sending++;
869 list_add(&tx->tx_list, &conn->ibc_active_txs);
870
871 /* I'm still holding ibc_lock! */
872 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
873 rc = -ECONNABORTED;
874 } else if (tx->tx_pool->tpo_pool.po_failed ||
875 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
876 /* close_conn will launch failover */
877 rc = -ENETDOWN;
878 } else {
879 rc = ib_post_send(conn->ibc_cmid->qp,
880 tx->tx_wrq, &bad_wrq);
881 }
882
883 conn->ibc_last_send = jiffies;
884
885 if (rc == 0)
886 return 0;
887
888 /* NB credits are transferred in the actual
889 * message, which can only be the last work item */
890 conn->ibc_credits += credit;
891 conn->ibc_outstanding_credits += msg->ibm_credits;
892 conn->ibc_nsends_posted--;
893 if (msg->ibm_type == IBLND_MSG_NOOP)
894 conn->ibc_noops_posted--;
895
896 tx->tx_status = rc;
897 tx->tx_waiting = 0;
898 tx->tx_sending--;
899
900 done = (tx->tx_sending == 0);
901 if (done)
902 list_del(&tx->tx_list);
903
904 spin_unlock(&conn->ibc_lock);
905
906 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
907 CERROR("Error %d posting transmit to %s\n",
908 rc, libcfs_nid2str(peer->ibp_nid));
909 else
910 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
911 rc, libcfs_nid2str(peer->ibp_nid));
912
913 kiblnd_close_conn(conn, rc);
914
915 if (done)
916 kiblnd_tx_done(peer->ibp_ni, tx);
917
918 spin_lock(&conn->ibc_lock);
919
920 return -EIO;
921 }
922
923 void
924 kiblnd_check_sends (kib_conn_t *conn)
925 {
926 int ver = conn->ibc_version;
927 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
928 kib_tx_t *tx;
929
930 /* Don't send anything until after the connection is established */
931 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
932 CDEBUG(D_NET, "%s too soon\n",
933 libcfs_nid2str(conn->ibc_peer->ibp_nid));
934 return;
935 }
936
937 spin_lock(&conn->ibc_lock);
938
939 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
940 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
941 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
942 LASSERT (conn->ibc_reserved_credits >= 0);
943
944 while (conn->ibc_reserved_credits > 0 &&
945 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
946 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
947 kib_tx_t, tx_list);
948 list_del(&tx->tx_list);
949 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
950 conn->ibc_reserved_credits--;
951 }
952
953 if (kiblnd_need_noop(conn)) {
954 spin_unlock(&conn->ibc_lock);
955
956 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
957 if (tx != NULL)
958 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
959
960 spin_lock(&conn->ibc_lock);
961 if (tx != NULL)
962 kiblnd_queue_tx_locked(tx, conn);
963 }
964
965 kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
966
967 for (;;) {
968 int credit;
969
970 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
971 credit = 0;
972 tx = list_entry(conn->ibc_tx_queue_nocred.next,
973 kib_tx_t, tx_list);
974 } else if (!list_empty(&conn->ibc_tx_noops)) {
975 LASSERT (!IBLND_OOB_CAPABLE(ver));
976 credit = 1;
977 tx = list_entry(conn->ibc_tx_noops.next,
978 kib_tx_t, tx_list);
979 } else if (!list_empty(&conn->ibc_tx_queue)) {
980 credit = 1;
981 tx = list_entry(conn->ibc_tx_queue.next,
982 kib_tx_t, tx_list);
983 } else
984 break;
985
986 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
987 break;
988 }
989
990 spin_unlock(&conn->ibc_lock);
991
992 kiblnd_conn_decref(conn); /* ...until here */
993 }
994
995 void
996 kiblnd_tx_complete (kib_tx_t *tx, int status)
997 {
998 int failed = (status != IB_WC_SUCCESS);
999 kib_conn_t *conn = tx->tx_conn;
1000 int idle;
1001
1002 LASSERT (tx->tx_sending > 0);
1003
1004 if (failed) {
1005 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1006 CNETERR("Tx -> %s cookie "LPX64
1007 " sending %d waiting %d: failed %d\n",
1008 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1009 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1010 status);
1011
1012 kiblnd_close_conn(conn, -EIO);
1013 } else {
1014 kiblnd_peer_alive(conn->ibc_peer);
1015 }
1016
1017 spin_lock(&conn->ibc_lock);
1018
1019 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1020 * gets to free it, which also drops its ref on 'conn'. */
1021
1022 tx->tx_sending--;
1023 conn->ibc_nsends_posted--;
1024 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1025 conn->ibc_noops_posted--;
1026
1027 if (failed) {
1028 tx->tx_waiting = 0; /* don't wait for peer */
1029 tx->tx_status = -EIO;
1030 }
1031
1032 idle = (tx->tx_sending == 0) && /* This is the final callback */
1033 !tx->tx_waiting && /* Not waiting for peer */
1034 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1035 if (idle)
1036 list_del(&tx->tx_list);
1037
1038 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1039
1040 spin_unlock(&conn->ibc_lock);
1041
1042 if (idle)
1043 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1044
1045 kiblnd_check_sends(conn);
1046
1047 kiblnd_conn_decref(conn); /* ...until here */
1048 }
1049
1050 void
1051 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1052 {
1053 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1054 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1055 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1056 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1057 struct ib_mr *mr;
1058
1059 LASSERT (tx->tx_nwrq >= 0);
1060 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1061 LASSERT (nob <= IBLND_MSG_SIZE);
1062
1063 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1064
1065 mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
1066 LASSERT (mr != NULL);
1067
1068 sge->lkey = mr->lkey;
1069 sge->addr = tx->tx_msgaddr;
1070 sge->length = nob;
1071
1072 memset(wrq, 0, sizeof(*wrq));
1073
1074 wrq->next = NULL;
1075 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1076 wrq->sg_list = sge;
1077 wrq->num_sge = 1;
1078 wrq->opcode = IB_WR_SEND;
1079 wrq->send_flags = IB_SEND_SIGNALED;
1080
1081 tx->tx_nwrq++;
1082 }
1083
1084 int
1085 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1086 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1087 {
1088 kib_msg_t *ibmsg = tx->tx_msg;
1089 kib_rdma_desc_t *srcrd = tx->tx_rd;
1090 struct ib_sge *sge = &tx->tx_sge[0];
1091 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1092 int rc = resid;
1093 int srcidx;
1094 int dstidx;
1095 int wrknob;
1096
1097 LASSERT (!in_interrupt());
1098 LASSERT (tx->tx_nwrq == 0);
1099 LASSERT (type == IBLND_MSG_GET_DONE ||
1100 type == IBLND_MSG_PUT_DONE);
1101
1102 srcidx = dstidx = 0;
1103
1104 while (resid > 0) {
1105 if (srcidx >= srcrd->rd_nfrags) {
1106 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1107 rc = -EPROTO;
1108 break;
1109 }
1110
1111 if (dstidx == dstrd->rd_nfrags) {
1112 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1113 rc = -EPROTO;
1114 break;
1115 }
1116
1117 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1118 CERROR("RDMA too fragmented for %s (%d): "
1119 "%d/%d src %d/%d dst frags\n",
1120 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1121 IBLND_RDMA_FRAGS(conn->ibc_version),
1122 srcidx, srcrd->rd_nfrags,
1123 dstidx, dstrd->rd_nfrags);
1124 rc = -EMSGSIZE;
1125 break;
1126 }
1127
1128 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1129 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1130
1131 sge = &tx->tx_sge[tx->tx_nwrq];
1132 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1133 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1134 sge->length = wrknob;
1135
1136 wrq = &tx->tx_wrq[tx->tx_nwrq];
1137
1138 wrq->next = wrq + 1;
1139 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1140 wrq->sg_list = sge;
1141 wrq->num_sge = 1;
1142 wrq->opcode = IB_WR_RDMA_WRITE;
1143 wrq->send_flags = 0;
1144
1145 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1146 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1147
1148 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1149 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1150
1151 resid -= wrknob;
1152
1153 tx->tx_nwrq++;
1154 wrq++;
1155 sge++;
1156 }
1157
1158 if (rc < 0) /* no RDMA if completing with failure */
1159 tx->tx_nwrq = 0;
1160
1161 ibmsg->ibm_u.completion.ibcm_status = rc;
1162 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1163 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1164 type, sizeof (kib_completion_msg_t));
1165
1166 return rc;
1167 }
1168
1169 void
1170 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1171 {
1172 struct list_head *q;
1173
1174 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1175 LASSERT (!tx->tx_queued); /* not queued for sending already */
1176 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1177
1178 tx->tx_queued = 1;
1179 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1180
1181 if (tx->tx_conn == NULL) {
1182 kiblnd_conn_addref(conn);
1183 tx->tx_conn = conn;
1184 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1185 } else {
1186 /* PUT_DONE first attached to conn as a PUT_REQ */
1187 LASSERT (tx->tx_conn == conn);
1188 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1189 }
1190
1191 switch (tx->tx_msg->ibm_type) {
1192 default:
1193 LBUG();
1194
1195 case IBLND_MSG_PUT_REQ:
1196 case IBLND_MSG_GET_REQ:
1197 q = &conn->ibc_tx_queue_rsrvd;
1198 break;
1199
1200 case IBLND_MSG_PUT_NAK:
1201 case IBLND_MSG_PUT_ACK:
1202 case IBLND_MSG_PUT_DONE:
1203 case IBLND_MSG_GET_DONE:
1204 q = &conn->ibc_tx_queue_nocred;
1205 break;
1206
1207 case IBLND_MSG_NOOP:
1208 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1209 q = &conn->ibc_tx_queue_nocred;
1210 else
1211 q = &conn->ibc_tx_noops;
1212 break;
1213
1214 case IBLND_MSG_IMMEDIATE:
1215 q = &conn->ibc_tx_queue;
1216 break;
1217 }
1218
1219 list_add_tail(&tx->tx_list, q);
1220 }
1221
1222 void
1223 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1224 {
1225 spin_lock(&conn->ibc_lock);
1226 kiblnd_queue_tx_locked(tx, conn);
1227 spin_unlock(&conn->ibc_lock);
1228
1229 kiblnd_check_sends(conn);
1230 }
1231
1232 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1233 struct sockaddr_in *srcaddr,
1234 struct sockaddr_in *dstaddr,
1235 int timeout_ms)
1236 {
1237 unsigned short port;
1238 int rc;
1239
1240 /* allow the port to be reused */
1241 rc = rdma_set_reuseaddr(cmid, 1);
1242 if (rc != 0) {
1243 CERROR("Unable to set reuse on cmid: %d\n", rc);
1244 return rc;
1245 }
1246
1247 /* look for a free privileged port */
1248 for (port = PROT_SOCK-1; port > 0; port--) {
1249 srcaddr->sin_port = htons(port);
1250 rc = rdma_resolve_addr(cmid,
1251 (struct sockaddr *)srcaddr,
1252 (struct sockaddr *)dstaddr,
1253 timeout_ms);
1254 if (rc == 0) {
1255 CDEBUG(D_NET, "bound to port %hu\n", port);
1256 return 0;
1257 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1258 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1259 port, rc);
1260 } else {
1261 return rc;
1262 }
1263 }
1264
1265 CERROR("Failed to bind to a free privileged port\n");
1266 return rc;
1267 }
1268
1269 void
1270 kiblnd_connect_peer (kib_peer_t *peer)
1271 {
1272 struct rdma_cm_id *cmid;
1273 kib_dev_t *dev;
1274 kib_net_t *net = peer->ibp_ni->ni_data;
1275 struct sockaddr_in srcaddr;
1276 struct sockaddr_in dstaddr;
1277 int rc;
1278
1279 LASSERT (net != NULL);
1280 LASSERT (peer->ibp_connecting > 0);
1281
1282 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1283 IB_QPT_RC);
1284
1285 if (IS_ERR(cmid)) {
1286 CERROR("Can't create CMID for %s: %ld\n",
1287 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1288 rc = PTR_ERR(cmid);
1289 goto failed;
1290 }
1291
1292 dev = net->ibn_dev;
1293 memset(&srcaddr, 0, sizeof(srcaddr));
1294 srcaddr.sin_family = AF_INET;
1295 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1296
1297 memset(&dstaddr, 0, sizeof(dstaddr));
1298 dstaddr.sin_family = AF_INET;
1299 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1300 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1301
1302 kiblnd_peer_addref(peer); /* cmid's ref */
1303
1304 if (*kiblnd_tunables.kib_use_priv_port) {
1305 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1306 *kiblnd_tunables.kib_timeout * 1000);
1307 } else {
1308 rc = rdma_resolve_addr(cmid,
1309 (struct sockaddr *)&srcaddr,
1310 (struct sockaddr *)&dstaddr,
1311 *kiblnd_tunables.kib_timeout * 1000);
1312 }
1313 if (rc != 0) {
1314 /* Can't initiate address resolution: */
1315 CERROR("Can't resolve addr for %s: %d\n",
1316 libcfs_nid2str(peer->ibp_nid), rc);
1317 goto failed2;
1318 }
1319
1320 LASSERT (cmid->device != NULL);
1321 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1322 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1323 &dev->ibd_ifip, cmid->device->name);
1324
1325 return;
1326
1327 failed2:
1328 kiblnd_peer_decref(peer); /* cmid's ref */
1329 rdma_destroy_id(cmid);
1330 failed:
1331 kiblnd_peer_connect_failed(peer, 1, rc);
1332 }
1333
1334 void
1335 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1336 {
1337 kib_peer_t *peer;
1338 kib_peer_t *peer2;
1339 kib_conn_t *conn;
1340 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1341 unsigned long flags;
1342 int rc;
1343
1344 /* If I get here, I've committed to send, so I complete the tx with
1345 * failure on any problems */
1346
1347 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1348 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1349
1350 /* First time, just use a read lock since I expect to find my peer
1351 * connected */
1352 read_lock_irqsave(g_lock, flags);
1353
1354 peer = kiblnd_find_peer_locked(nid);
1355 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1356 /* Found a peer with an established connection */
1357 conn = kiblnd_get_conn_locked(peer);
1358 kiblnd_conn_addref(conn); /* 1 ref for me... */
1359
1360 read_unlock_irqrestore(g_lock, flags);
1361
1362 if (tx != NULL)
1363 kiblnd_queue_tx(tx, conn);
1364 kiblnd_conn_decref(conn); /* ...to here */
1365 return;
1366 }
1367
1368 read_unlock(g_lock);
1369 /* Re-try with a write lock */
1370 write_lock(g_lock);
1371
1372 peer = kiblnd_find_peer_locked(nid);
1373 if (peer != NULL) {
1374 if (list_empty(&peer->ibp_conns)) {
1375 /* found a peer, but it's still connecting... */
1376 LASSERT (peer->ibp_connecting != 0 ||
1377 peer->ibp_accepting != 0);
1378 if (tx != NULL)
1379 list_add_tail(&tx->tx_list,
1380 &peer->ibp_tx_queue);
1381 write_unlock_irqrestore(g_lock, flags);
1382 } else {
1383 conn = kiblnd_get_conn_locked(peer);
1384 kiblnd_conn_addref(conn); /* 1 ref for me... */
1385
1386 write_unlock_irqrestore(g_lock, flags);
1387
1388 if (tx != NULL)
1389 kiblnd_queue_tx(tx, conn);
1390 kiblnd_conn_decref(conn); /* ...to here */
1391 }
1392 return;
1393 }
1394
1395 write_unlock_irqrestore(g_lock, flags);
1396
1397 /* Allocate a peer ready to add to the peer table and retry */
1398 rc = kiblnd_create_peer(ni, &peer, nid);
1399 if (rc != 0) {
1400 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1401 if (tx != NULL) {
1402 tx->tx_status = -EHOSTUNREACH;
1403 tx->tx_waiting = 0;
1404 kiblnd_tx_done(ni, tx);
1405 }
1406 return;
1407 }
1408
1409 write_lock_irqsave(g_lock, flags);
1410
1411 peer2 = kiblnd_find_peer_locked(nid);
1412 if (peer2 != NULL) {
1413 if (list_empty(&peer2->ibp_conns)) {
1414 /* found a peer, but it's still connecting... */
1415 LASSERT (peer2->ibp_connecting != 0 ||
1416 peer2->ibp_accepting != 0);
1417 if (tx != NULL)
1418 list_add_tail(&tx->tx_list,
1419 &peer2->ibp_tx_queue);
1420 write_unlock_irqrestore(g_lock, flags);
1421 } else {
1422 conn = kiblnd_get_conn_locked(peer2);
1423 kiblnd_conn_addref(conn); /* 1 ref for me... */
1424
1425 write_unlock_irqrestore(g_lock, flags);
1426
1427 if (tx != NULL)
1428 kiblnd_queue_tx(tx, conn);
1429 kiblnd_conn_decref(conn); /* ...to here */
1430 }
1431
1432 kiblnd_peer_decref(peer);
1433 return;
1434 }
1435
1436 /* Brand new peer */
1437 LASSERT (peer->ibp_connecting == 0);
1438 peer->ibp_connecting = 1;
1439
1440 /* always called with a ref on ni, which prevents ni being shutdown */
1441 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1442
1443 if (tx != NULL)
1444 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1445
1446 kiblnd_peer_addref(peer);
1447 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1448
1449 write_unlock_irqrestore(g_lock, flags);
1450
1451 kiblnd_connect_peer(peer);
1452 kiblnd_peer_decref(peer);
1453 }
1454
1455 int
1456 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1457 {
1458 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1459 int type = lntmsg->msg_type;
1460 lnet_process_id_t target = lntmsg->msg_target;
1461 int target_is_router = lntmsg->msg_target_is_router;
1462 int routing = lntmsg->msg_routing;
1463 unsigned int payload_niov = lntmsg->msg_niov;
1464 struct iovec *payload_iov = lntmsg->msg_iov;
1465 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1466 unsigned int payload_offset = lntmsg->msg_offset;
1467 unsigned int payload_nob = lntmsg->msg_len;
1468 kib_msg_t *ibmsg;
1469 kib_tx_t *tx;
1470 int nob;
1471 int rc;
1472
1473 /* NB 'private' is different depending on what we're sending.... */
1474
1475 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1476 payload_nob, payload_niov, libcfs_id2str(target));
1477
1478 LASSERT (payload_nob == 0 || payload_niov > 0);
1479 LASSERT (payload_niov <= LNET_MAX_IOV);
1480
1481 /* Thread context */
1482 LASSERT (!in_interrupt());
1483 /* payload is either all vaddrs or all pages */
1484 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1485
1486 switch (type) {
1487 default:
1488 LBUG();
1489 return (-EIO);
1490
1491 case LNET_MSG_ACK:
1492 LASSERT (payload_nob == 0);
1493 break;
1494
1495 case LNET_MSG_GET:
1496 if (routing || target_is_router)
1497 break; /* send IMMEDIATE */
1498
1499 /* is the REPLY message too small for RDMA? */
1500 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1501 if (nob <= IBLND_MSG_SIZE)
1502 break; /* send IMMEDIATE */
1503
1504 tx = kiblnd_get_idle_tx(ni, target.nid);
1505 if (tx == NULL) {
1506 CERROR("Can't allocate txd for GET to %s\n",
1507 libcfs_nid2str(target.nid));
1508 return -ENOMEM;
1509 }
1510
1511 ibmsg = tx->tx_msg;
1512
1513 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1514 rc = kiblnd_setup_rd_iov(ni, tx,
1515 &ibmsg->ibm_u.get.ibgm_rd,
1516 lntmsg->msg_md->md_niov,
1517 lntmsg->msg_md->md_iov.iov,
1518 0, lntmsg->msg_md->md_length);
1519 else
1520 rc = kiblnd_setup_rd_kiov(ni, tx,
1521 &ibmsg->ibm_u.get.ibgm_rd,
1522 lntmsg->msg_md->md_niov,
1523 lntmsg->msg_md->md_iov.kiov,
1524 0, lntmsg->msg_md->md_length);
1525 if (rc != 0) {
1526 CERROR("Can't setup GET sink for %s: %d\n",
1527 libcfs_nid2str(target.nid), rc);
1528 kiblnd_tx_done(ni, tx);
1529 return -EIO;
1530 }
1531
1532 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1533 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1534 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1535
1536 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1537
1538 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1539 if (tx->tx_lntmsg[1] == NULL) {
1540 CERROR("Can't create reply for GET -> %s\n",
1541 libcfs_nid2str(target.nid));
1542 kiblnd_tx_done(ni, tx);
1543 return -EIO;
1544 }
1545
1546 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1547 tx->tx_waiting = 1; /* waiting for GET_DONE */
1548 kiblnd_launch_tx(ni, tx, target.nid);
1549 return 0;
1550
1551 case LNET_MSG_REPLY:
1552 case LNET_MSG_PUT:
1553 /* Is the payload small enough not to need RDMA? */
1554 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1555 if (nob <= IBLND_MSG_SIZE)
1556 break; /* send IMMEDIATE */
1557
1558 tx = kiblnd_get_idle_tx(ni, target.nid);
1559 if (tx == NULL) {
1560 CERROR("Can't allocate %s txd for %s\n",
1561 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1562 libcfs_nid2str(target.nid));
1563 return -ENOMEM;
1564 }
1565
1566 if (payload_kiov == NULL)
1567 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1568 payload_niov, payload_iov,
1569 payload_offset, payload_nob);
1570 else
1571 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1572 payload_niov, payload_kiov,
1573 payload_offset, payload_nob);
1574 if (rc != 0) {
1575 CERROR("Can't setup PUT src for %s: %d\n",
1576 libcfs_nid2str(target.nid), rc);
1577 kiblnd_tx_done(ni, tx);
1578 return -EIO;
1579 }
1580
1581 ibmsg = tx->tx_msg;
1582 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1583 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1584 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1585
1586 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1587 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1588 kiblnd_launch_tx(ni, tx, target.nid);
1589 return 0;
1590 }
1591
1592 /* send IMMEDIATE */
1593
1594 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1595 <= IBLND_MSG_SIZE);
1596
1597 tx = kiblnd_get_idle_tx(ni, target.nid);
1598 if (tx == NULL) {
1599 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1600 type, libcfs_nid2str(target.nid));
1601 return -ENOMEM;
1602 }
1603
1604 ibmsg = tx->tx_msg;
1605 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1606
1607 if (payload_kiov != NULL)
1608 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1609 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1610 payload_niov, payload_kiov,
1611 payload_offset, payload_nob);
1612 else
1613 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1614 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1615 payload_niov, payload_iov,
1616 payload_offset, payload_nob);
1617
1618 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1619 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1620
1621 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1622 kiblnd_launch_tx(ni, tx, target.nid);
1623 return 0;
1624 }
1625
1626 void
1627 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1628 {
1629 lnet_process_id_t target = lntmsg->msg_target;
1630 unsigned int niov = lntmsg->msg_niov;
1631 struct iovec *iov = lntmsg->msg_iov;
1632 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1633 unsigned int offset = lntmsg->msg_offset;
1634 unsigned int nob = lntmsg->msg_len;
1635 kib_tx_t *tx;
1636 int rc;
1637
1638 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1639 if (tx == NULL) {
1640 CERROR("Can't get tx for REPLY to %s\n",
1641 libcfs_nid2str(target.nid));
1642 goto failed_0;
1643 }
1644
1645 if (nob == 0)
1646 rc = 0;
1647 else if (kiov == NULL)
1648 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1649 niov, iov, offset, nob);
1650 else
1651 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1652 niov, kiov, offset, nob);
1653
1654 if (rc != 0) {
1655 CERROR("Can't setup GET src for %s: %d\n",
1656 libcfs_nid2str(target.nid), rc);
1657 goto failed_1;
1658 }
1659
1660 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1661 IBLND_MSG_GET_DONE, nob,
1662 &rx->rx_msg->ibm_u.get.ibgm_rd,
1663 rx->rx_msg->ibm_u.get.ibgm_cookie);
1664 if (rc < 0) {
1665 CERROR("Can't setup rdma for GET from %s: %d\n",
1666 libcfs_nid2str(target.nid), rc);
1667 goto failed_1;
1668 }
1669
1670 if (nob == 0) {
1671 /* No RDMA: local completion may happen now! */
1672 lnet_finalize(ni, lntmsg, 0);
1673 } else {
1674 /* RDMA: lnet_finalize(lntmsg) when it
1675 * completes */
1676 tx->tx_lntmsg[0] = lntmsg;
1677 }
1678
1679 kiblnd_queue_tx(tx, rx->rx_conn);
1680 return;
1681
1682 failed_1:
1683 kiblnd_tx_done(ni, tx);
1684 failed_0:
1685 lnet_finalize(ni, lntmsg, -EIO);
1686 }
1687
1688 int
1689 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1690 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1691 unsigned int offset, unsigned int mlen, unsigned int rlen)
1692 {
1693 kib_rx_t *rx = private;
1694 kib_msg_t *rxmsg = rx->rx_msg;
1695 kib_conn_t *conn = rx->rx_conn;
1696 kib_tx_t *tx;
1697 kib_msg_t *txmsg;
1698 int nob;
1699 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1700 int rc = 0;
1701
1702 LASSERT (mlen <= rlen);
1703 LASSERT (!in_interrupt());
1704 /* Either all pages or all vaddrs */
1705 LASSERT (!(kiov != NULL && iov != NULL));
1706
1707 switch (rxmsg->ibm_type) {
1708 default:
1709 LBUG();
1710
1711 case IBLND_MSG_IMMEDIATE:
1712 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1713 if (nob > rx->rx_nob) {
1714 CERROR ("Immediate message from %s too big: %d(%d)\n",
1715 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1716 nob, rx->rx_nob);
1717 rc = -EPROTO;
1718 break;
1719 }
1720
1721 if (kiov != NULL)
1722 lnet_copy_flat2kiov(niov, kiov, offset,
1723 IBLND_MSG_SIZE, rxmsg,
1724 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1725 mlen);
1726 else
1727 lnet_copy_flat2iov(niov, iov, offset,
1728 IBLND_MSG_SIZE, rxmsg,
1729 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1730 mlen);
1731 lnet_finalize (ni, lntmsg, 0);
1732 break;
1733
1734 case IBLND_MSG_PUT_REQ:
1735 if (mlen == 0) {
1736 lnet_finalize(ni, lntmsg, 0);
1737 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1738 rxmsg->ibm_u.putreq.ibprm_cookie);
1739 break;
1740 }
1741
1742 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1743 if (tx == NULL) {
1744 CERROR("Can't allocate tx for %s\n",
1745 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1746 /* Not replying will break the connection */
1747 rc = -ENOMEM;
1748 break;
1749 }
1750
1751 txmsg = tx->tx_msg;
1752 if (kiov == NULL)
1753 rc = kiblnd_setup_rd_iov(ni, tx,
1754 &txmsg->ibm_u.putack.ibpam_rd,
1755 niov, iov, offset, mlen);
1756 else
1757 rc = kiblnd_setup_rd_kiov(ni, tx,
1758 &txmsg->ibm_u.putack.ibpam_rd,
1759 niov, kiov, offset, mlen);
1760 if (rc != 0) {
1761 CERROR("Can't setup PUT sink for %s: %d\n",
1762 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1763 kiblnd_tx_done(ni, tx);
1764 /* tell peer it's over */
1765 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1766 rxmsg->ibm_u.putreq.ibprm_cookie);
1767 break;
1768 }
1769
1770 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1771 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1772 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1773
1774 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1775
1776 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1777 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1778 kiblnd_queue_tx(tx, conn);
1779
1780 /* reposted buffer reserved for PUT_DONE */
1781 post_credit = IBLND_POSTRX_NO_CREDIT;
1782 break;
1783
1784 case IBLND_MSG_GET_REQ:
1785 if (lntmsg != NULL) {
1786 /* Optimized GET; RDMA lntmsg's payload */
1787 kiblnd_reply(ni, rx, lntmsg);
1788 } else {
1789 /* GET didn't match anything */
1790 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1791 -ENODATA,
1792 rxmsg->ibm_u.get.ibgm_cookie);
1793 }
1794 break;
1795 }
1796
1797 kiblnd_post_rx(rx, post_credit);
1798 return rc;
1799 }
1800
1801 int
1802 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1803 {
1804 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1805
1806 if (IS_ERR(task))
1807 return PTR_ERR(task);
1808
1809 atomic_inc(&kiblnd_data.kib_nthreads);
1810 return 0;
1811 }
1812
1813 void
1814 kiblnd_thread_fini (void)
1815 {
1816 atomic_dec (&kiblnd_data.kib_nthreads);
1817 }
1818
1819 void
1820 kiblnd_peer_alive (kib_peer_t *peer)
1821 {
1822 /* This is racy, but everyone's only writing cfs_time_current() */
1823 peer->ibp_last_alive = cfs_time_current();
1824 mb();
1825 }
1826
1827 void
1828 kiblnd_peer_notify (kib_peer_t *peer)
1829 {
1830 int error = 0;
1831 cfs_time_t last_alive = 0;
1832 unsigned long flags;
1833
1834 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1835
1836 if (list_empty(&peer->ibp_conns) &&
1837 peer->ibp_accepting == 0 &&
1838 peer->ibp_connecting == 0 &&
1839 peer->ibp_error != 0) {
1840 error = peer->ibp_error;
1841 peer->ibp_error = 0;
1842
1843 last_alive = peer->ibp_last_alive;
1844 }
1845
1846 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1847
1848 if (error != 0)
1849 lnet_notify(peer->ibp_ni,
1850 peer->ibp_nid, 0, last_alive);
1851 }
1852
1853 void
1854 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1855 {
1856 /* This just does the immediate housekeeping. 'error' is zero for a
1857 * normal shutdown which can happen only after the connection has been
1858 * established. If the connection is established, schedule the
1859 * connection to be finished off by the connd. Otherwise the connd is
1860 * already dealing with it (either to set it up or tear it down).
1861 * Caller holds kib_global_lock exclusively in irq context */
1862 kib_peer_t *peer = conn->ibc_peer;
1863 kib_dev_t *dev;
1864 unsigned long flags;
1865
1866 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1867
1868 if (error != 0 && conn->ibc_comms_error == 0)
1869 conn->ibc_comms_error = error;
1870
1871 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1872 return; /* already being handled */
1873
1874 if (error == 0 &&
1875 list_empty(&conn->ibc_tx_noops) &&
1876 list_empty(&conn->ibc_tx_queue) &&
1877 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1878 list_empty(&conn->ibc_tx_queue_nocred) &&
1879 list_empty(&conn->ibc_active_txs)) {
1880 CDEBUG(D_NET, "closing conn to %s\n",
1881 libcfs_nid2str(peer->ibp_nid));
1882 } else {
1883 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1884 libcfs_nid2str(peer->ibp_nid), error,
1885 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1886 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1887 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1888 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1889 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1890 }
1891
1892 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1893 list_del(&conn->ibc_list);
1894 /* connd (see below) takes over ibc_list's ref */
1895
1896 if (list_empty (&peer->ibp_conns) && /* no more conns */
1897 kiblnd_peer_active(peer)) { /* still in peer table */
1898 kiblnd_unlink_peer_locked(peer);
1899
1900 /* set/clear error on last conn */
1901 peer->ibp_error = conn->ibc_comms_error;
1902 }
1903
1904 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1905
1906 if (error != 0 &&
1907 kiblnd_dev_can_failover(dev)) {
1908 list_add_tail(&dev->ibd_fail_list,
1909 &kiblnd_data.kib_failed_devs);
1910 wake_up(&kiblnd_data.kib_failover_waitq);
1911 }
1912
1913 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1914
1915 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1916 wake_up(&kiblnd_data.kib_connd_waitq);
1917
1918 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1919 }
1920
1921 void
1922 kiblnd_close_conn(kib_conn_t *conn, int error)
1923 {
1924 unsigned long flags;
1925
1926 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1927
1928 kiblnd_close_conn_locked(conn, error);
1929
1930 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1931 }
1932
1933 void
1934 kiblnd_handle_early_rxs(kib_conn_t *conn)
1935 {
1936 unsigned long flags;
1937 kib_rx_t *rx;
1938
1939 LASSERT(!in_interrupt());
1940 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1941
1942 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1943 while (!list_empty(&conn->ibc_early_rxs)) {
1944 rx = list_entry(conn->ibc_early_rxs.next,
1945 kib_rx_t, rx_list);
1946 list_del(&rx->rx_list);
1947 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1948
1949 kiblnd_handle_rx(rx);
1950
1951 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1952 }
1953 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1954 }
1955
1956 void
1957 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1958 {
1959 LIST_HEAD (zombies);
1960 struct list_head *tmp;
1961 struct list_head *nxt;
1962 kib_tx_t *tx;
1963
1964 spin_lock(&conn->ibc_lock);
1965
1966 list_for_each_safe (tmp, nxt, txs) {
1967 tx = list_entry (tmp, kib_tx_t, tx_list);
1968
1969 if (txs == &conn->ibc_active_txs) {
1970 LASSERT (!tx->tx_queued);
1971 LASSERT (tx->tx_waiting ||
1972 tx->tx_sending != 0);
1973 } else {
1974 LASSERT (tx->tx_queued);
1975 }
1976
1977 tx->tx_status = -ECONNABORTED;
1978 tx->tx_waiting = 0;
1979
1980 if (tx->tx_sending == 0) {
1981 tx->tx_queued = 0;
1982 list_del (&tx->tx_list);
1983 list_add (&tx->tx_list, &zombies);
1984 }
1985 }
1986
1987 spin_unlock(&conn->ibc_lock);
1988
1989 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
1990 }
1991
1992 void
1993 kiblnd_finalise_conn (kib_conn_t *conn)
1994 {
1995 LASSERT (!in_interrupt());
1996 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
1997
1998 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
1999
2000 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2001 * for connections that didn't get as far as being connected, because
2002 * rdma_disconnect() does this for free. */
2003 kiblnd_abort_receives(conn);
2004
2005 /* Complete all tx descs not waiting for sends to complete.
2006 * NB we should be safe from RDMA now that the QP has changed state */
2007
2008 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2009 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2010 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2011 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2012 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2013
2014 kiblnd_handle_early_rxs(conn);
2015 }
2016
2017 void
2018 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
2019 {
2020 LIST_HEAD (zombies);
2021 unsigned long flags;
2022
2023 LASSERT (error != 0);
2024 LASSERT (!in_interrupt());
2025
2026 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2027
2028 if (active) {
2029 LASSERT (peer->ibp_connecting > 0);
2030 peer->ibp_connecting--;
2031 } else {
2032 LASSERT (peer->ibp_accepting > 0);
2033 peer->ibp_accepting--;
2034 }
2035
2036 if (peer->ibp_connecting != 0 ||
2037 peer->ibp_accepting != 0) {
2038 /* another connection attempt under way... */
2039 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2040 flags);
2041 return;
2042 }
2043
2044 if (list_empty(&peer->ibp_conns)) {
2045 /* Take peer's blocked transmits to complete with error */
2046 list_add(&zombies, &peer->ibp_tx_queue);
2047 list_del_init(&peer->ibp_tx_queue);
2048
2049 if (kiblnd_peer_active(peer))
2050 kiblnd_unlink_peer_locked(peer);
2051
2052 peer->ibp_error = error;
2053 } else {
2054 /* Can't have blocked transmits if there are connections */
2055 LASSERT (list_empty(&peer->ibp_tx_queue));
2056 }
2057
2058 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2059
2060 kiblnd_peer_notify(peer);
2061
2062 if (list_empty (&zombies))
2063 return;
2064
2065 CNETERR("Deleting messages for %s: connection failed\n",
2066 libcfs_nid2str(peer->ibp_nid));
2067
2068 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2069 }
2070
2071 void
2072 kiblnd_connreq_done(kib_conn_t *conn, int status)
2073 {
2074 kib_peer_t *peer = conn->ibc_peer;
2075 kib_tx_t *tx;
2076 struct list_head txs;
2077 unsigned long flags;
2078 int active;
2079
2080 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2081
2082 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2083 libcfs_nid2str(peer->ibp_nid), active,
2084 conn->ibc_version, status);
2085
2086 LASSERT (!in_interrupt());
2087 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2088 peer->ibp_connecting > 0) ||
2089 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2090 peer->ibp_accepting > 0));
2091
2092 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2093 conn->ibc_connvars = NULL;
2094
2095 if (status != 0) {
2096 /* failed to establish connection */
2097 kiblnd_peer_connect_failed(peer, active, status);
2098 kiblnd_finalise_conn(conn);
2099 return;
2100 }
2101
2102 /* connection established */
2103 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2104
2105 conn->ibc_last_send = jiffies;
2106 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2107 kiblnd_peer_alive(peer);
2108
2109 /* Add conn to peer's list and nuke any dangling conns from a different
2110 * peer instance... */
2111 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2112 list_add(&conn->ibc_list, &peer->ibp_conns);
2113 if (active)
2114 peer->ibp_connecting--;
2115 else
2116 peer->ibp_accepting--;
2117
2118 if (peer->ibp_version == 0) {
2119 peer->ibp_version = conn->ibc_version;
2120 peer->ibp_incarnation = conn->ibc_incarnation;
2121 }
2122
2123 if (peer->ibp_version != conn->ibc_version ||
2124 peer->ibp_incarnation != conn->ibc_incarnation) {
2125 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2126 conn->ibc_incarnation);
2127 peer->ibp_version = conn->ibc_version;
2128 peer->ibp_incarnation = conn->ibc_incarnation;
2129 }
2130
2131 /* grab pending txs while I have the lock */
2132 list_add(&txs, &peer->ibp_tx_queue);
2133 list_del_init(&peer->ibp_tx_queue);
2134
2135 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2136 conn->ibc_comms_error != 0) { /* error has happened already */
2137 lnet_ni_t *ni = peer->ibp_ni;
2138
2139 /* start to shut down connection */
2140 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2141 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2142
2143 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2144
2145 return;
2146 }
2147
2148 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2149
2150 /* Schedule blocked txs */
2151 spin_lock(&conn->ibc_lock);
2152 while (!list_empty(&txs)) {
2153 tx = list_entry(txs.next, kib_tx_t, tx_list);
2154 list_del(&tx->tx_list);
2155
2156 kiblnd_queue_tx_locked(tx, conn);
2157 }
2158 spin_unlock(&conn->ibc_lock);
2159
2160 kiblnd_check_sends(conn);
2161
2162 /* schedule blocked rxs */
2163 kiblnd_handle_early_rxs(conn);
2164 }
2165
2166 void
2167 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2168 {
2169 int rc;
2170
2171 rc = rdma_reject(cmid, rej, sizeof(*rej));
2172
2173 if (rc != 0)
2174 CWARN("Error %d sending reject\n", rc);
2175 }
2176
2177 int
2178 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2179 {
2180 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2181 kib_msg_t *reqmsg = priv;
2182 kib_msg_t *ackmsg;
2183 kib_dev_t *ibdev;
2184 kib_peer_t *peer;
2185 kib_peer_t *peer2;
2186 kib_conn_t *conn;
2187 lnet_ni_t *ni = NULL;
2188 kib_net_t *net = NULL;
2189 lnet_nid_t nid;
2190 struct rdma_conn_param cp;
2191 kib_rej_t rej;
2192 int version = IBLND_MSG_VERSION;
2193 unsigned long flags;
2194 int rc;
2195 struct sockaddr_in *peer_addr;
2196 LASSERT (!in_interrupt());
2197
2198 /* cmid inherits 'context' from the corresponding listener id */
2199 ibdev = (kib_dev_t *)cmid->context;
2200 LASSERT (ibdev != NULL);
2201
2202 memset(&rej, 0, sizeof(rej));
2203 rej.ibr_magic = IBLND_MSG_MAGIC;
2204 rej.ibr_why = IBLND_REJECT_FATAL;
2205 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2206
2207 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2208 if (*kiblnd_tunables.kib_require_priv_port &&
2209 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2210 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2211 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2212 &ip, ntohs(peer_addr->sin_port));
2213 goto failed;
2214 }
2215
2216 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2217 CERROR("Short connection request\n");
2218 goto failed;
2219 }
2220
2221 /* Future protocol version compatibility support! If the
2222 * o2iblnd-specific protocol changes, or when LNET unifies
2223 * protocols over all LNDs, the initial connection will
2224 * negotiate a protocol version. I trap this here to avoid
2225 * console errors; the reject tells the peer which protocol I
2226 * speak. */
2227 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2228 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2229 goto failed;
2230 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2231 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2232 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2233 goto failed;
2234 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2235 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2236 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2237 goto failed;
2238
2239 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2240 if (rc != 0) {
2241 CERROR("Can't parse connection request: %d\n", rc);
2242 goto failed;
2243 }
2244
2245 nid = reqmsg->ibm_srcnid;
2246 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2247
2248 if (ni != NULL) {
2249 net = (kib_net_t *)ni->ni_data;
2250 rej.ibr_incarnation = net->ibn_incarnation;
2251 }
2252
2253 if (ni == NULL || /* no matching net */
2254 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2255 net->ibn_dev != ibdev) { /* wrong device */
2256 CERROR("Can't accept %s on %s (%s:%d:%pI4h): "
2257 "bad dst nid %s\n", libcfs_nid2str(nid),
2258 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2259 ibdev->ibd_ifname, ibdev->ibd_nnets,
2260 &ibdev->ibd_ifip,
2261 libcfs_nid2str(reqmsg->ibm_dstnid));
2262
2263 goto failed;
2264 }
2265
2266 /* check time stamp as soon as possible */
2267 if (reqmsg->ibm_dststamp != 0 &&
2268 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2269 CWARN("Stale connection request\n");
2270 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2271 goto failed;
2272 }
2273
2274 /* I can accept peer's version */
2275 version = reqmsg->ibm_version;
2276
2277 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2278 CERROR("Unexpected connreq msg type: %x from %s\n",
2279 reqmsg->ibm_type, libcfs_nid2str(nid));
2280 goto failed;
2281 }
2282
2283 if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2284 IBLND_MSG_QUEUE_SIZE(version)) {
2285 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2286 libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2287 IBLND_MSG_QUEUE_SIZE(version));
2288
2289 if (version == IBLND_MSG_VERSION)
2290 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2291
2292 goto failed;
2293 }
2294
2295 if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2296 IBLND_RDMA_FRAGS(version)) {
2297 CERROR("Can't accept %s(version %x): "
2298 "incompatible max_frags %d (%d wanted)\n",
2299 libcfs_nid2str(nid), version,
2300 reqmsg->ibm_u.connparams.ibcp_max_frags,
2301 IBLND_RDMA_FRAGS(version));
2302
2303 if (version == IBLND_MSG_VERSION)
2304 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2305
2306 goto failed;
2307
2308 }
2309
2310 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2311 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2312 libcfs_nid2str(nid),
2313 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2314 IBLND_MSG_SIZE);
2315 goto failed;
2316 }
2317
2318 /* assume 'nid' is a new peer; create */
2319 rc = kiblnd_create_peer(ni, &peer, nid);
2320 if (rc != 0) {
2321 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2322 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2323 goto failed;
2324 }
2325
2326 write_lock_irqsave(g_lock, flags);
2327
2328 peer2 = kiblnd_find_peer_locked(nid);
2329 if (peer2 != NULL) {
2330 if (peer2->ibp_version == 0) {
2331 peer2->ibp_version = version;
2332 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2333 }
2334
2335 /* not the guy I've talked with */
2336 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2337 peer2->ibp_version != version) {
2338 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2339 write_unlock_irqrestore(g_lock, flags);
2340
2341 CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2342 libcfs_nid2str(nid), peer2->ibp_version, version);
2343
2344 kiblnd_peer_decref(peer);
2345 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2346 goto failed;
2347 }
2348
2349 /* tie-break connection race in favour of the higher NID */
2350 if (peer2->ibp_connecting != 0 &&
2351 nid < ni->ni_nid) {
2352 write_unlock_irqrestore(g_lock, flags);
2353
2354 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2355
2356 kiblnd_peer_decref(peer);
2357 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2358 goto failed;
2359 }
2360
2361 peer2->ibp_accepting++;
2362 kiblnd_peer_addref(peer2);
2363
2364 write_unlock_irqrestore(g_lock, flags);
2365 kiblnd_peer_decref(peer);
2366 peer = peer2;
2367 } else {
2368 /* Brand new peer */
2369 LASSERT (peer->ibp_accepting == 0);
2370 LASSERT (peer->ibp_version == 0 &&
2371 peer->ibp_incarnation == 0);
2372
2373 peer->ibp_accepting = 1;
2374 peer->ibp_version = version;
2375 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2376
2377 /* I have a ref on ni that prevents it being shutdown */
2378 LASSERT (net->ibn_shutdown == 0);
2379
2380 kiblnd_peer_addref(peer);
2381 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2382
2383 write_unlock_irqrestore(g_lock, flags);
2384 }
2385
2386 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2387 if (conn == NULL) {
2388 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2389 kiblnd_peer_decref(peer);
2390 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2391 goto failed;
2392 }
2393
2394 /* conn now "owns" cmid, so I return success from here on to ensure the
2395 * CM callback doesn't destroy cmid. */
2396
2397 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2398 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
2399 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2400 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2401 <= IBLND_RX_MSGS(version));
2402
2403 ackmsg = &conn->ibc_connvars->cv_msg;
2404 memset(ackmsg, 0, sizeof(*ackmsg));
2405
2406 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2407 sizeof(ackmsg->ibm_u.connparams));
2408 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2409 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2410 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2411
2412 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2413
2414 memset(&cp, 0, sizeof(cp));
2415 cp.private_data = ackmsg;
2416 cp.private_data_len = ackmsg->ibm_nob;
2417 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2418 cp.initiator_depth = 0;
2419 cp.flow_control = 1;
2420 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2421 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2422
2423 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2424
2425 rc = rdma_accept(cmid, &cp);
2426 if (rc != 0) {
2427 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2428 rej.ibr_version = version;
2429 rej.ibr_why = IBLND_REJECT_FATAL;
2430
2431 kiblnd_reject(cmid, &rej);
2432 kiblnd_connreq_done(conn, rc);
2433 kiblnd_conn_decref(conn);
2434 }
2435
2436 lnet_ni_decref(ni);
2437 return 0;
2438
2439 failed:
2440 if (ni != NULL)
2441 lnet_ni_decref(ni);
2442
2443 rej.ibr_version = version;
2444 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2445 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2446 kiblnd_reject(cmid, &rej);
2447
2448 return -ECONNREFUSED;
2449 }
2450
2451 void
2452 kiblnd_reconnect (kib_conn_t *conn, int version,
2453 __u64 incarnation, int why, kib_connparams_t *cp)
2454 {
2455 kib_peer_t *peer = conn->ibc_peer;
2456 char *reason;
2457 int retry = 0;
2458 unsigned long flags;
2459
2460 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2461 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2462
2463 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2464
2465 /* retry connection if it's still needed and no other connection
2466 * attempts (active or passive) are in progress
2467 * NB: reconnect is still needed even when ibp_tx_queue is
2468 * empty if ibp_version != version because reconnect may be
2469 * initiated by kiblnd_query() */
2470 if ((!list_empty(&peer->ibp_tx_queue) ||
2471 peer->ibp_version != version) &&
2472 peer->ibp_connecting == 1 &&
2473 peer->ibp_accepting == 0) {
2474 retry = 1;
2475 peer->ibp_connecting++;
2476
2477 peer->ibp_version = version;
2478 peer->ibp_incarnation = incarnation;
2479 }
2480
2481 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2482
2483 if (!retry)
2484 return;
2485
2486 switch (why) {
2487 default:
2488 reason = "Unknown";
2489 break;
2490
2491 case IBLND_REJECT_CONN_STALE:
2492 reason = "stale";
2493 break;
2494
2495 case IBLND_REJECT_CONN_RACE:
2496 reason = "conn race";
2497 break;
2498
2499 case IBLND_REJECT_CONN_UNCOMPAT:
2500 reason = "version negotiation";
2501 break;
2502 }
2503
2504 CNETERR("%s: retrying (%s), %x, %x, "
2505 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2506 libcfs_nid2str(peer->ibp_nid),
2507 reason, IBLND_MSG_VERSION, version,
2508 cp != NULL? cp->ibcp_queue_depth :IBLND_MSG_QUEUE_SIZE(version),
2509 cp != NULL? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
2510 cp != NULL? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2511
2512 kiblnd_connect_peer(peer);
2513 }
2514
2515 void
2516 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2517 {
2518 kib_peer_t *peer = conn->ibc_peer;
2519
2520 LASSERT (!in_interrupt());
2521 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2522
2523 switch (reason) {
2524 case IB_CM_REJ_STALE_CONN:
2525 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2526 IBLND_REJECT_CONN_STALE, NULL);
2527 break;
2528
2529 case IB_CM_REJ_INVALID_SERVICE_ID:
2530 CNETERR("%s rejected: no listener at %d\n",
2531 libcfs_nid2str(peer->ibp_nid),
2532 *kiblnd_tunables.kib_service);
2533 break;
2534
2535 case IB_CM_REJ_CONSUMER_DEFINED:
2536 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2537 kib_rej_t *rej = priv;
2538 kib_connparams_t *cp = NULL;
2539 int flip = 0;
2540 __u64 incarnation = -1;
2541
2542 /* NB. default incarnation is -1 because:
2543 * a) V1 will ignore dst incarnation in connreq.
2544 * b) V2 will provide incarnation while rejecting me,
2545 * -1 will be overwrote.
2546 *
2547 * if I try to connect to a V1 peer with V2 protocol,
2548 * it rejected me then upgrade to V2, I have no idea
2549 * about the upgrading and try to reconnect with V1,
2550 * in this case upgraded V2 can find out I'm trying to
2551 * talk to the old guy and reject me(incarnation is -1).
2552 */
2553
2554 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2555 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2556 __swab32s(&rej->ibr_magic);
2557 __swab16s(&rej->ibr_version);
2558 flip = 1;
2559 }
2560
2561 if (priv_nob >= sizeof(kib_rej_t) &&
2562 rej->ibr_version > IBLND_MSG_VERSION_1) {
2563 /* priv_nob is always 148 in current version
2564 * of OFED, so we still need to check version.
2565 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2566 cp = &rej->ibr_cp;
2567
2568 if (flip) {
2569 __swab64s(&rej->ibr_incarnation);
2570 __swab16s(&cp->ibcp_queue_depth);
2571 __swab16s(&cp->ibcp_max_frags);
2572 __swab32s(&cp->ibcp_max_msg_size);
2573 }
2574
2575 incarnation = rej->ibr_incarnation;
2576 }
2577
2578 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2579 rej->ibr_magic != LNET_PROTO_MAGIC) {
2580 CERROR("%s rejected: consumer defined fatal error\n",
2581 libcfs_nid2str(peer->ibp_nid));
2582 break;
2583 }
2584
2585 if (rej->ibr_version != IBLND_MSG_VERSION &&
2586 rej->ibr_version != IBLND_MSG_VERSION_1) {
2587 CERROR("%s rejected: o2iblnd version %x error\n",
2588 libcfs_nid2str(peer->ibp_nid),
2589 rej->ibr_version);
2590 break;
2591 }
2592
2593 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2594 rej->ibr_version == IBLND_MSG_VERSION_1) {
2595 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2596 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2597
2598 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2599 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2600 }
2601
2602 switch (rej->ibr_why) {
2603 case IBLND_REJECT_CONN_RACE:
2604 case IBLND_REJECT_CONN_STALE:
2605 case IBLND_REJECT_CONN_UNCOMPAT:
2606 kiblnd_reconnect(conn, rej->ibr_version,
2607 incarnation, rej->ibr_why, cp);
2608 break;
2609
2610 case IBLND_REJECT_MSG_QUEUE_SIZE:
2611 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2612 libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2613 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2614 break;
2615
2616 case IBLND_REJECT_RDMA_FRAGS:
2617 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2618 libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2619 IBLND_RDMA_FRAGS(conn->ibc_version));
2620 break;
2621
2622 case IBLND_REJECT_NO_RESOURCES:
2623 CERROR("%s rejected: o2iblnd no resources\n",
2624 libcfs_nid2str(peer->ibp_nid));
2625 break;
2626
2627 case IBLND_REJECT_FATAL:
2628 CERROR("%s rejected: o2iblnd fatal error\n",
2629 libcfs_nid2str(peer->ibp_nid));
2630 break;
2631
2632 default:
2633 CERROR("%s rejected: o2iblnd reason %d\n",
2634 libcfs_nid2str(peer->ibp_nid),
2635 rej->ibr_why);
2636 break;
2637 }
2638 break;
2639 }
2640 /* fall through */
2641 default:
2642 CNETERR("%s rejected: reason %d, size %d\n",
2643 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2644 break;
2645 }
2646
2647 kiblnd_connreq_done(conn, -ECONNREFUSED);
2648 }
2649
2650 void
2651 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2652 {
2653 kib_peer_t *peer = conn->ibc_peer;
2654 lnet_ni_t *ni = peer->ibp_ni;
2655 kib_net_t *net = ni->ni_data;
2656 kib_msg_t *msg = priv;
2657 int ver = conn->ibc_version;
2658 int rc = kiblnd_unpack_msg(msg, priv_nob);
2659 unsigned long flags;
2660
2661 LASSERT (net != NULL);
2662
2663 if (rc != 0) {
2664 CERROR("Can't unpack connack from %s: %d\n",
2665 libcfs_nid2str(peer->ibp_nid), rc);
2666 goto failed;
2667 }
2668
2669 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2670 CERROR("Unexpected message %d from %s\n",
2671 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2672 rc = -EPROTO;
2673 goto failed;
2674 }
2675
2676 if (ver != msg->ibm_version) {
2677 CERROR("%s replied version %x is different with "
2678 "requested version %x\n",
2679 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2680 rc = -EPROTO;
2681 goto failed;
2682 }
2683
2684 if (msg->ibm_u.connparams.ibcp_queue_depth !=
2685 IBLND_MSG_QUEUE_SIZE(ver)) {
2686 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2687 libcfs_nid2str(peer->ibp_nid),
2688 msg->ibm_u.connparams.ibcp_queue_depth,
2689 IBLND_MSG_QUEUE_SIZE(ver));
2690 rc = -EPROTO;
2691 goto failed;
2692 }
2693
2694 if (msg->ibm_u.connparams.ibcp_max_frags !=
2695 IBLND_RDMA_FRAGS(ver)) {
2696 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2697 libcfs_nid2str(peer->ibp_nid),
2698 msg->ibm_u.connparams.ibcp_max_frags,
2699 IBLND_RDMA_FRAGS(ver));
2700 rc = -EPROTO;
2701 goto failed;
2702 }
2703
2704 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2705 CERROR("%s max message size %d too big (%d max)\n",
2706 libcfs_nid2str(peer->ibp_nid),
2707 msg->ibm_u.connparams.ibcp_max_msg_size,
2708 IBLND_MSG_SIZE);
2709 rc = -EPROTO;
2710 goto failed;
2711 }
2712
2713 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2714 if (msg->ibm_dstnid == ni->ni_nid &&
2715 msg->ibm_dststamp == net->ibn_incarnation)
2716 rc = 0;
2717 else
2718 rc = -ESTALE;
2719 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2720
2721 if (rc != 0) {
2722 CERROR("Bad connection reply from %s, rc = %d, "
2723 "version: %x max_frags: %d\n",
2724 libcfs_nid2str(peer->ibp_nid), rc,
2725 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2726 goto failed;
2727 }
2728
2729 conn->ibc_incarnation = msg->ibm_srcstamp;
2730 conn->ibc_credits =
2731 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2732 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2733 <= IBLND_RX_MSGS(ver));
2734
2735 kiblnd_connreq_done(conn, 0);
2736 return;
2737
2738 failed:
2739 /* NB My QP has already established itself, so I handle anything going
2740 * wrong here by setting ibc_comms_error.
2741 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2742 * immediately tears it down. */
2743
2744 LASSERT (rc != 0);
2745 conn->ibc_comms_error = rc;
2746 kiblnd_connreq_done(conn, 0);
2747 }
2748
2749 int
2750 kiblnd_active_connect (struct rdma_cm_id *cmid)
2751 {
2752 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2753 kib_conn_t *conn;
2754 kib_msg_t *msg;
2755 struct rdma_conn_param cp;
2756 int version;
2757 __u64 incarnation;
2758 unsigned long flags;
2759 int rc;
2760
2761 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2762
2763 incarnation = peer->ibp_incarnation;
2764 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2765 peer->ibp_version;
2766
2767 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2768
2769 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2770 if (conn == NULL) {
2771 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2772 kiblnd_peer_decref(peer); /* lose cmid's ref */
2773 return -ENOMEM;
2774 }
2775
2776 /* conn "owns" cmid now, so I return success from here on to ensure the
2777 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2778 * on peer */
2779
2780 msg = &conn->ibc_connvars->cv_msg;
2781
2782 memset(msg, 0, sizeof(*msg));
2783 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2784 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2785 msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2786 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2787
2788 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2789 0, peer->ibp_nid, incarnation);
2790
2791 memset(&cp, 0, sizeof(cp));
2792 cp.private_data = msg;
2793 cp.private_data_len = msg->ibm_nob;
2794 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2795 cp.initiator_depth = 0;
2796 cp.flow_control = 1;
2797 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2798 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2799
2800 LASSERT(cmid->context == (void *)conn);
2801 LASSERT(conn->ibc_cmid == cmid);
2802
2803 rc = rdma_connect(cmid, &cp);
2804 if (rc != 0) {
2805 CERROR("Can't connect to %s: %d\n",
2806 libcfs_nid2str(peer->ibp_nid), rc);
2807 kiblnd_connreq_done(conn, rc);
2808 kiblnd_conn_decref(conn);
2809 }
2810
2811 return 0;
2812 }
2813
2814 int
2815 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2816 {
2817 kib_peer_t *peer;
2818 kib_conn_t *conn;
2819 int rc;
2820
2821 switch (event->event) {
2822 default:
2823 CERROR("Unexpected event: %d, status: %d\n",
2824 event->event, event->status);
2825 LBUG();
2826
2827 case RDMA_CM_EVENT_CONNECT_REQUEST:
2828 /* destroy cmid on failure */
2829 rc = kiblnd_passive_connect(cmid,
2830 (void *)KIBLND_CONN_PARAM(event),
2831 KIBLND_CONN_PARAM_LEN(event));
2832 CDEBUG(D_NET, "connreq: %d\n", rc);
2833 return rc;
2834
2835 case RDMA_CM_EVENT_ADDR_ERROR:
2836 peer = (kib_peer_t *)cmid->context;
2837 CNETERR("%s: ADDR ERROR %d\n",
2838 libcfs_nid2str(peer->ibp_nid), event->status);
2839 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2840 kiblnd_peer_decref(peer);
2841 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2842
2843 case RDMA_CM_EVENT_ADDR_RESOLVED:
2844 peer = (kib_peer_t *)cmid->context;
2845
2846 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2847 libcfs_nid2str(peer->ibp_nid), event->status);
2848
2849 if (event->status != 0) {
2850 CNETERR("Can't resolve address for %s: %d\n",
2851 libcfs_nid2str(peer->ibp_nid), event->status);
2852 rc = event->status;
2853 } else {
2854 rc = rdma_resolve_route(
2855 cmid, *kiblnd_tunables.kib_timeout * 1000);
2856 if (rc == 0)
2857 return 0;
2858 /* Can't initiate route resolution */
2859 CERROR("Can't resolve route for %s: %d\n",
2860 libcfs_nid2str(peer->ibp_nid), rc);
2861 }
2862 kiblnd_peer_connect_failed(peer, 1, rc);
2863 kiblnd_peer_decref(peer);
2864 return rc; /* rc != 0 destroys cmid */
2865
2866 case RDMA_CM_EVENT_ROUTE_ERROR:
2867 peer = (kib_peer_t *)cmid->context;
2868 CNETERR("%s: ROUTE ERROR %d\n",
2869 libcfs_nid2str(peer->ibp_nid), event->status);
2870 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2871 kiblnd_peer_decref(peer);
2872 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2873
2874 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2875 peer = (kib_peer_t *)cmid->context;
2876 CDEBUG(D_NET,"%s Route resolved: %d\n",
2877 libcfs_nid2str(peer->ibp_nid), event->status);
2878
2879 if (event->status == 0)
2880 return kiblnd_active_connect(cmid);
2881
2882 CNETERR("Can't resolve route for %s: %d\n",
2883 libcfs_nid2str(peer->ibp_nid), event->status);
2884 kiblnd_peer_connect_failed(peer, 1, event->status);
2885 kiblnd_peer_decref(peer);
2886 return event->status; /* rc != 0 destroys cmid */
2887
2888 case RDMA_CM_EVENT_UNREACHABLE:
2889 conn = (kib_conn_t *)cmid->context;
2890 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2891 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2892 CNETERR("%s: UNREACHABLE %d\n",
2893 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2894 kiblnd_connreq_done(conn, -ENETDOWN);
2895 kiblnd_conn_decref(conn);
2896 return 0;
2897
2898 case RDMA_CM_EVENT_CONNECT_ERROR:
2899 conn = (kib_conn_t *)cmid->context;
2900 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2901 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2902 CNETERR("%s: CONNECT ERROR %d\n",
2903 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2904 kiblnd_connreq_done(conn, -ENOTCONN);
2905 kiblnd_conn_decref(conn);
2906 return 0;
2907
2908 case RDMA_CM_EVENT_REJECTED:
2909 conn = (kib_conn_t *)cmid->context;
2910 switch (conn->ibc_state) {
2911 default:
2912 LBUG();
2913
2914 case IBLND_CONN_PASSIVE_WAIT:
2915 CERROR ("%s: REJECTED %d\n",
2916 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2917 event->status);
2918 kiblnd_connreq_done(conn, -ECONNRESET);
2919 break;
2920
2921 case IBLND_CONN_ACTIVE_CONNECT:
2922 kiblnd_rejected(conn, event->status,
2923 (void *)KIBLND_CONN_PARAM(event),
2924 KIBLND_CONN_PARAM_LEN(event));
2925 break;
2926 }
2927 kiblnd_conn_decref(conn);
2928 return 0;
2929
2930 case RDMA_CM_EVENT_ESTABLISHED:
2931 conn = (kib_conn_t *)cmid->context;
2932 switch (conn->ibc_state) {
2933 default:
2934 LBUG();
2935
2936 case IBLND_CONN_PASSIVE_WAIT:
2937 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2938 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2939 kiblnd_connreq_done(conn, 0);
2940 break;
2941
2942 case IBLND_CONN_ACTIVE_CONNECT:
2943 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2944 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2945 kiblnd_check_connreply(conn,
2946 (void *)KIBLND_CONN_PARAM(event),
2947 KIBLND_CONN_PARAM_LEN(event));
2948 break;
2949 }
2950 /* net keeps its ref on conn! */
2951 return 0;
2952
2953 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2954 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2955 return 0;
2956 case RDMA_CM_EVENT_DISCONNECTED:
2957 conn = (kib_conn_t *)cmid->context;
2958 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2959 CERROR("%s DISCONNECTED\n",
2960 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2961 kiblnd_connreq_done(conn, -ECONNRESET);
2962 } else {
2963 kiblnd_close_conn(conn, 0);
2964 }
2965 kiblnd_conn_decref(conn);
2966 cmid->context = NULL;
2967 return 0;
2968
2969 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2970 LCONSOLE_ERROR_MSG(0x131,
2971 "Received notification of device removal\n"
2972 "Please shutdown LNET to allow this to proceed\n");
2973 /* Can't remove network from underneath LNET for now, so I have
2974 * to ignore this */
2975 return 0;
2976
2977 case RDMA_CM_EVENT_ADDR_CHANGE:
2978 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2979 return 0;
2980 }
2981 }
2982
2983 static int
2984 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
2985 {
2986 kib_tx_t *tx;
2987 struct list_head *ttmp;
2988
2989 list_for_each (ttmp, txs) {
2990 tx = list_entry (ttmp, kib_tx_t, tx_list);
2991
2992 if (txs != &conn->ibc_active_txs) {
2993 LASSERT (tx->tx_queued);
2994 } else {
2995 LASSERT (!tx->tx_queued);
2996 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
2997 }
2998
2999 if (cfs_time_aftereq (jiffies, tx->tx_deadline)) {
3000 CERROR("Timed out tx: %s, %lu seconds\n",
3001 kiblnd_queue2str(conn, txs),
3002 cfs_duration_sec(jiffies - tx->tx_deadline));
3003 return 1;
3004 }
3005 }
3006
3007 return 0;
3008 }
3009
3010 static int
3011 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3012 {
3013 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3014 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3015 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3016 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3017 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3018 }
3019
3020 void
3021 kiblnd_check_conns (int idx)
3022 {
3023 LIST_HEAD (closes);
3024 LIST_HEAD (checksends);
3025 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3026 struct list_head *ptmp;
3027 kib_peer_t *peer;
3028 kib_conn_t *conn;
3029 struct list_head *ctmp;
3030 unsigned long flags;
3031
3032 /* NB. We expect to have a look at all the peers and not find any
3033 * RDMAs to time out, so we just use a shared lock while we
3034 * take a look... */
3035 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3036
3037 list_for_each (ptmp, peers) {
3038 peer = list_entry (ptmp, kib_peer_t, ibp_list);
3039
3040 list_for_each (ctmp, &peer->ibp_conns) {
3041 int timedout;
3042 int sendnoop;
3043
3044 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3045
3046 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
3047
3048 spin_lock(&conn->ibc_lock);
3049
3050 sendnoop = kiblnd_need_noop(conn);
3051 timedout = kiblnd_conn_timed_out_locked(conn);
3052 if (!sendnoop && !timedout) {
3053 spin_unlock(&conn->ibc_lock);
3054 continue;
3055 }
3056
3057 if (timedout) {
3058 CERROR("Timed out RDMA with %s (%lu): "
3059 "c: %u, oc: %u, rc: %u\n",
3060 libcfs_nid2str(peer->ibp_nid),
3061 cfs_duration_sec(cfs_time_current() -
3062 peer->ibp_last_alive),
3063 conn->ibc_credits,
3064 conn->ibc_outstanding_credits,
3065 conn->ibc_reserved_credits);
3066 list_add(&conn->ibc_connd_list, &closes);
3067 } else {
3068 list_add(&conn->ibc_connd_list,
3069 &checksends);
3070 }
3071 /* +ref for 'closes' or 'checksends' */
3072 kiblnd_conn_addref(conn);
3073
3074 spin_unlock(&conn->ibc_lock);
3075 }
3076 }
3077
3078 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3079
3080 /* Handle timeout by closing the whole
3081 * connection. We can only be sure RDMA activity
3082 * has ceased once the QP has been modified. */
3083 while (!list_empty(&closes)) {
3084 conn = list_entry(closes.next,
3085 kib_conn_t, ibc_connd_list);
3086 list_del(&conn->ibc_connd_list);
3087 kiblnd_close_conn(conn, -ETIMEDOUT);
3088 kiblnd_conn_decref(conn);
3089 }
3090
3091 /* In case we have enough credits to return via a
3092 * NOOP, but there were no non-blocking tx descs
3093 * free to do it last time... */
3094 while (!list_empty(&checksends)) {
3095 conn = list_entry(checksends.next,
3096 kib_conn_t, ibc_connd_list);
3097 list_del(&conn->ibc_connd_list);
3098 kiblnd_check_sends(conn);
3099 kiblnd_conn_decref(conn);
3100 }
3101 }
3102
3103 void
3104 kiblnd_disconnect_conn (kib_conn_t *conn)
3105 {
3106 LASSERT (!in_interrupt());
3107 LASSERT (current == kiblnd_data.kib_connd);
3108 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3109
3110 rdma_disconnect(conn->ibc_cmid);
3111 kiblnd_finalise_conn(conn);
3112
3113 kiblnd_peer_notify(conn->ibc_peer);
3114 }
3115
3116 int
3117 kiblnd_connd (void *arg)
3118 {
3119 wait_queue_t wait;
3120 unsigned long flags;
3121 kib_conn_t *conn;
3122 int timeout;
3123 int i;
3124 int dropped_lock;
3125 int peer_index = 0;
3126 unsigned long deadline = jiffies;
3127
3128 cfs_block_allsigs ();
3129
3130 init_waitqueue_entry_current (&wait);
3131 kiblnd_data.kib_connd = current;
3132
3133 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3134
3135 while (!kiblnd_data.kib_shutdown) {
3136
3137 dropped_lock = 0;
3138
3139 if (!list_empty (&kiblnd_data.kib_connd_zombies)) {
3140 conn = list_entry(kiblnd_data. \
3141 kib_connd_zombies.next,
3142 kib_conn_t, ibc_list);
3143 list_del(&conn->ibc_list);
3144
3145 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3146 flags);
3147 dropped_lock = 1;
3148
3149 kiblnd_destroy_conn(conn);
3150
3151 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3152 }
3153
3154 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3155 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3156 kib_conn_t, ibc_list);
3157 list_del(&conn->ibc_list);
3158
3159 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3160 flags);
3161 dropped_lock = 1;
3162
3163 kiblnd_disconnect_conn(conn);
3164 kiblnd_conn_decref(conn);
3165
3166 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3167 }
3168
3169 /* careful with the jiffy wrap... */
3170 timeout = (int)(deadline - jiffies);
3171 if (timeout <= 0) {
3172 const int n = 4;
3173 const int p = 1;
3174 int chunk = kiblnd_data.kib_peer_hash_size;
3175
3176 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3177 dropped_lock = 1;
3178
3179 /* Time to check for RDMA timeouts on a few more
3180 * peers: I do checks every 'p' seconds on a
3181 * proportion of the peer table and I need to check
3182 * every connection 'n' times within a timeout
3183 * interval, to ensure I detect a timeout on any
3184 * connection within (n+1)/n times the timeout
3185 * interval. */
3186
3187 if (*kiblnd_tunables.kib_timeout > n * p)
3188 chunk = (chunk * n * p) /
3189 *kiblnd_tunables.kib_timeout;
3190 if (chunk == 0)
3191 chunk = 1;
3192
3193 for (i = 0; i < chunk; i++) {
3194 kiblnd_check_conns(peer_index);
3195 peer_index = (peer_index + 1) %
3196 kiblnd_data.kib_peer_hash_size;
3197 }
3198
3199 deadline += p * HZ;
3200 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3201 }
3202
3203 if (dropped_lock)
3204 continue;
3205
3206 /* Nothing to do for 'timeout' */
3207 set_current_state(TASK_INTERRUPTIBLE);
3208 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3209 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3210
3211 waitq_timedwait(&wait, TASK_INTERRUPTIBLE, timeout);
3212
3213 set_current_state(TASK_RUNNING);
3214 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3215 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3216 }
3217
3218 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3219
3220 kiblnd_thread_fini();
3221 return 0;
3222 }
3223
3224 void
3225 kiblnd_qp_event(struct ib_event *event, void *arg)
3226 {
3227 kib_conn_t *conn = arg;
3228
3229 switch (event->event) {
3230 case IB_EVENT_COMM_EST:
3231 CDEBUG(D_NET, "%s established\n",
3232 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3233 return;
3234
3235 default:
3236 CERROR("%s: Async QP event type %d\n",
3237 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3238 return;
3239 }
3240 }
3241
3242 void
3243 kiblnd_complete (struct ib_wc *wc)
3244 {
3245 switch (kiblnd_wreqid2type(wc->wr_id)) {
3246 default:
3247 LBUG();
3248
3249 case IBLND_WID_RDMA:
3250 /* We only get RDMA completion notification if it fails. All
3251 * subsequent work items, including the final SEND will fail
3252 * too. However we can't print out any more info about the
3253 * failing RDMA because 'tx' might be back on the idle list or
3254 * even reused already if we didn't manage to post all our work
3255 * items */
3256 CNETERR("RDMA (tx: %p) failed: %d\n",
3257 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3258 return;
3259
3260 case IBLND_WID_TX:
3261 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3262 return;
3263
3264 case IBLND_WID_RX:
3265 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3266 wc->byte_len);
3267 return;
3268 }
3269 }
3270
3271 void
3272 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3273 {
3274 /* NB I'm not allowed to schedule this conn once its refcount has
3275 * reached 0. Since fundamentally I'm racing with scheduler threads
3276 * consuming my CQ I could be called after all completions have
3277 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3278 * and this CQ is about to be destroyed so I NOOP. */
3279 kib_conn_t *conn = (kib_conn_t *)arg;
3280 struct kib_sched_info *sched = conn->ibc_sched;
3281 unsigned long flags;
3282
3283 LASSERT(cq == conn->ibc_cq);
3284
3285 spin_lock_irqsave(&sched->ibs_lock, flags);
3286
3287 conn->ibc_ready = 1;
3288
3289 if (!conn->ibc_scheduled &&
3290 (conn->ibc_nrx > 0 ||
3291 conn->ibc_nsends_posted > 0)) {
3292 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3293 conn->ibc_scheduled = 1;
3294 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3295
3296 if (waitqueue_active(&sched->ibs_waitq))
3297 wake_up(&sched->ibs_waitq);
3298 }
3299
3300 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3301 }
3302
3303 void
3304 kiblnd_cq_event(struct ib_event *event, void *arg)
3305 {
3306 kib_conn_t *conn = arg;
3307
3308 CERROR("%s: async CQ event type %d\n",
3309 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3310 }
3311
3312 int
3313 kiblnd_scheduler(void *arg)
3314 {
3315 long id = (long)arg;
3316 struct kib_sched_info *sched;
3317 kib_conn_t *conn;
3318 wait_queue_t wait;
3319 unsigned long flags;
3320 struct ib_wc wc;
3321 int did_something;
3322 int busy_loops = 0;
3323 int rc;
3324
3325 cfs_block_allsigs();
3326
3327 init_waitqueue_entry_current(&wait);
3328
3329 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3330
3331 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3332 if (rc != 0) {
3333 CWARN("Failed to bind on CPT %d, please verify whether "
3334 "all CPUs are healthy and reload modules if necessary, "
3335 "otherwise your system might under risk of low "
3336 "performance\n", sched->ibs_cpt);
3337 }
3338
3339 spin_lock_irqsave(&sched->ibs_lock, flags);
3340
3341 while (!kiblnd_data.kib_shutdown) {
3342 if (busy_loops++ >= IBLND_RESCHED) {
3343 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3344
3345 cond_resched();
3346 busy_loops = 0;
3347
3348 spin_lock_irqsave(&sched->ibs_lock, flags);
3349 }
3350
3351 did_something = 0;
3352
3353 if (!list_empty(&sched->ibs_conns)) {
3354 conn = list_entry(sched->ibs_conns.next,
3355 kib_conn_t, ibc_sched_list);
3356 /* take over kib_sched_conns' ref on conn... */
3357 LASSERT(conn->ibc_scheduled);
3358 list_del(&conn->ibc_sched_list);
3359 conn->ibc_ready = 0;
3360
3361 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3362
3363 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3364 if (rc == 0) {
3365 rc = ib_req_notify_cq(conn->ibc_cq,
3366 IB_CQ_NEXT_COMP);
3367 if (rc < 0) {
3368 CWARN("%s: ib_req_notify_cq failed: %d, "
3369 "closing connection\n",
3370 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3371 kiblnd_close_conn(conn, -EIO);
3372 kiblnd_conn_decref(conn);
3373 spin_lock_irqsave(&sched->ibs_lock,
3374 flags);
3375 continue;
3376 }
3377
3378 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3379 }
3380
3381 if (rc < 0) {
3382 CWARN("%s: ib_poll_cq failed: %d, "
3383 "closing connection\n",
3384 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3385 rc);
3386 kiblnd_close_conn(conn, -EIO);
3387 kiblnd_conn_decref(conn);
3388 spin_lock_irqsave(&sched->ibs_lock, flags);
3389 continue;
3390 }
3391
3392 spin_lock_irqsave(&sched->ibs_lock, flags);
3393
3394 if (rc != 0 || conn->ibc_ready) {
3395 /* There may be another completion waiting; get
3396 * another scheduler to check while I handle
3397 * this one... */
3398 /* +1 ref for sched_conns */
3399 kiblnd_conn_addref(conn);
3400 list_add_tail(&conn->ibc_sched_list,
3401 &sched->ibs_conns);
3402 if (waitqueue_active(&sched->ibs_waitq))
3403 wake_up(&sched->ibs_waitq);
3404 } else {
3405 conn->ibc_scheduled = 0;
3406 }
3407
3408 if (rc != 0) {
3409 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3410 kiblnd_complete(&wc);
3411
3412 spin_lock_irqsave(&sched->ibs_lock, flags);
3413 }
3414
3415 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3416 did_something = 1;
3417 }
3418
3419 if (did_something)
3420 continue;
3421
3422 set_current_state(TASK_INTERRUPTIBLE);
3423 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3424 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3425
3426 waitq_wait(&wait, TASK_INTERRUPTIBLE);
3427 busy_loops = 0;
3428
3429 remove_wait_queue(&sched->ibs_waitq, &wait);
3430 set_current_state(TASK_RUNNING);
3431 spin_lock_irqsave(&sched->ibs_lock, flags);
3432 }
3433
3434 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3435
3436 kiblnd_thread_fini();
3437 return 0;
3438 }
3439
3440 int
3441 kiblnd_failover_thread(void *arg)
3442 {
3443 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3444 kib_dev_t *dev;
3445 wait_queue_t wait;
3446 unsigned long flags;
3447 int rc;
3448
3449 LASSERT (*kiblnd_tunables.kib_dev_failover != 0);
3450
3451 cfs_block_allsigs ();
3452
3453 init_waitqueue_entry_current(&wait);
3454 write_lock_irqsave(glock, flags);
3455
3456 while (!kiblnd_data.kib_shutdown) {
3457 int do_failover = 0;
3458 int long_sleep;
3459
3460 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3461 ibd_fail_list) {
3462 if (cfs_time_before(cfs_time_current(),
3463 dev->ibd_next_failover))
3464 continue;
3465 do_failover = 1;
3466 break;
3467 }
3468
3469 if (do_failover) {
3470 list_del_init(&dev->ibd_fail_list);
3471 dev->ibd_failover = 1;
3472 write_unlock_irqrestore(glock, flags);
3473
3474 rc = kiblnd_dev_failover(dev);
3475
3476 write_lock_irqsave(glock, flags);
3477
3478 LASSERT (dev->ibd_failover);
3479 dev->ibd_failover = 0;
3480 if (rc >= 0) { /* Device is OK or failover succeed */
3481 dev->ibd_next_failover = cfs_time_shift(3);
3482 continue;
3483 }
3484
3485 /* failed to failover, retry later */
3486 dev->ibd_next_failover =
3487 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3488 if (kiblnd_dev_can_failover(dev)) {
3489 list_add_tail(&dev->ibd_fail_list,
3490 &kiblnd_data.kib_failed_devs);
3491 }
3492
3493 continue;
3494 }
3495
3496 /* long sleep if no more pending failover */
3497 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3498
3499 set_current_state(TASK_INTERRUPTIBLE);
3500 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3501 write_unlock_irqrestore(glock, flags);
3502
3503 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3504 cfs_time_seconds(1));
3505 set_current_state(TASK_RUNNING);
3506 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3507 write_lock_irqsave(glock, flags);
3508
3509 if (!long_sleep || rc != 0)
3510 continue;
3511
3512 /* have a long sleep, routine check all active devices,
3513 * we need checking like this because if there is not active
3514 * connection on the dev and no SEND from local, we may listen
3515 * on wrong HCA for ever while there is a bonding failover */
3516 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3517 if (kiblnd_dev_can_failover(dev)) {
3518 list_add_tail(&dev->ibd_fail_list,
3519 &kiblnd_data.kib_failed_devs);
3520 }
3521 }
3522 }
3523
3524 write_unlock_irqrestore(glock, flags);
3525
3526 kiblnd_thread_fini();
3527 return 0;
3528 }
Linux kernel - Deliverables
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