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Merge tag 'for-linus' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming
[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 (vaddr >= VMALLOC_START &&
533 vaddr < VMALLOC_END) {
534 page = vmalloc_to_page ((void *)vaddr);
535 LASSERT (page != NULL);
536 return page;
537 }
538 #ifdef CONFIG_HIGHMEM
539 if (vaddr >= PKMAP_BASE &&
540 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
541 /* No highmem pages only used for bulk (kiov) I/O */
542 CERROR("find page for address in highmem\n");
543 LBUG();
544 }
545 #endif
546 page = virt_to_page (vaddr);
547 LASSERT (page != NULL);
548 return page;
549 }
550
551 static int
552 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
553 {
554 kib_hca_dev_t *hdev;
555 __u64 *pages = tx->tx_pages;
556 kib_fmr_poolset_t *fps;
557 int npages;
558 int size;
559 int cpt;
560 int rc;
561 int i;
562
563 LASSERT(tx->tx_pool != NULL);
564 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
565
566 hdev = tx->tx_pool->tpo_hdev;
567
568 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
569 for (size = 0; size < rd->rd_frags[i].rf_nob;
570 size += hdev->ibh_page_size) {
571 pages[npages ++] = (rd->rd_frags[i].rf_addr &
572 hdev->ibh_page_mask) + size;
573 }
574 }
575
576 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
577
578 fps = net->ibn_fmr_ps[cpt];
579 rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->tx_u.fmr);
580 if (rc != 0) {
581 CERROR ("Can't map %d pages: %d\n", npages, rc);
582 return rc;
583 }
584
585 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
586 * the rkey */
587 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.fmr.fmr_pfmr->fmr->rkey :
588 tx->tx_u.fmr.fmr_pfmr->fmr->lkey;
589 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
590 rd->rd_frags[0].rf_nob = nob;
591 rd->rd_nfrags = 1;
592
593 return 0;
594 }
595
596 static int
597 kiblnd_pmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
598 {
599 kib_hca_dev_t *hdev;
600 kib_pmr_poolset_t *pps;
601 __u64 iova;
602 int cpt;
603 int rc;
604
605 LASSERT(tx->tx_pool != NULL);
606 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
607
608 hdev = tx->tx_pool->tpo_hdev;
609
610 iova = rd->rd_frags[0].rf_addr & ~hdev->ibh_page_mask;
611
612 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
613
614 pps = net->ibn_pmr_ps[cpt];
615 rc = kiblnd_pmr_pool_map(pps, hdev, rd, &iova, &tx->tx_u.pmr);
616 if (rc != 0) {
617 CERROR("Failed to create MR by phybuf: %d\n", rc);
618 return rc;
619 }
620
621 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
622 * the rkey */
623 rd->rd_key = (rd != tx->tx_rd) ? tx->tx_u.pmr->pmr_mr->rkey :
624 tx->tx_u.pmr->pmr_mr->lkey;
625 rd->rd_nfrags = 1;
626 rd->rd_frags[0].rf_addr = iova;
627 rd->rd_frags[0].rf_nob = nob;
628
629 return 0;
630 }
631
632 void
633 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
634 {
635 kib_net_t *net = ni->ni_data;
636
637 LASSERT(net != NULL);
638
639 if (net->ibn_fmr_ps != NULL && tx->tx_u.fmr.fmr_pfmr != NULL) {
640 kiblnd_fmr_pool_unmap(&tx->tx_u.fmr, tx->tx_status);
641 tx->tx_u.fmr.fmr_pfmr = NULL;
642
643 } else if (net->ibn_pmr_ps != NULL && tx->tx_u.pmr != NULL) {
644 kiblnd_pmr_pool_unmap(tx->tx_u.pmr);
645 tx->tx_u.pmr = NULL;
646 }
647
648 if (tx->tx_nfrags != 0) {
649 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
650 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
651 tx->tx_nfrags = 0;
652 }
653 }
654
655 int
656 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx,
657 kib_rdma_desc_t *rd, int nfrags)
658 {
659 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
660 kib_net_t *net = ni->ni_data;
661 struct ib_mr *mr = NULL;
662 __u32 nob;
663 int i;
664
665 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
666 * RDMA sink */
667 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
668 tx->tx_nfrags = nfrags;
669
670 rd->rd_nfrags =
671 kiblnd_dma_map_sg(hdev->ibh_ibdev,
672 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
673
674 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
675 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
676 hdev->ibh_ibdev, &tx->tx_frags[i]);
677 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
678 hdev->ibh_ibdev, &tx->tx_frags[i]);
679 nob += rd->rd_frags[i].rf_nob;
680 }
681
682 /* looking for pre-mapping MR */
683 mr = kiblnd_find_rd_dma_mr(hdev, rd);
684 if (mr != NULL) {
685 /* found pre-mapping MR */
686 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
687 return 0;
688 }
689
690 if (net->ibn_fmr_ps != NULL)
691 return kiblnd_fmr_map_tx(net, tx, rd, nob);
692 else if (net->ibn_pmr_ps != NULL)
693 return kiblnd_pmr_map_tx(net, tx, rd, nob);
694
695 return -EINVAL;
696 }
697
698
699 int
700 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
701 unsigned int niov, struct iovec *iov, int offset, int nob)
702 {
703 kib_net_t *net = ni->ni_data;
704 struct page *page;
705 struct scatterlist *sg;
706 unsigned long vaddr;
707 int fragnob;
708 int page_offset;
709
710 LASSERT (nob > 0);
711 LASSERT (niov > 0);
712 LASSERT (net != NULL);
713
714 while (offset >= iov->iov_len) {
715 offset -= iov->iov_len;
716 niov--;
717 iov++;
718 LASSERT (niov > 0);
719 }
720
721 sg = tx->tx_frags;
722 do {
723 LASSERT (niov > 0);
724
725 vaddr = ((unsigned long)iov->iov_base) + offset;
726 page_offset = vaddr & (PAGE_SIZE - 1);
727 page = kiblnd_kvaddr_to_page(vaddr);
728 if (page == NULL) {
729 CERROR ("Can't find page\n");
730 return -EFAULT;
731 }
732
733 fragnob = min((int)(iov->iov_len - offset), nob);
734 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
735
736 sg_set_page(sg, page, fragnob, page_offset);
737 sg++;
738
739 if (offset + fragnob < iov->iov_len) {
740 offset += fragnob;
741 } else {
742 offset = 0;
743 iov++;
744 niov--;
745 }
746 nob -= fragnob;
747 } while (nob > 0);
748
749 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
750 }
751
752 int
753 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
754 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
755 {
756 kib_net_t *net = ni->ni_data;
757 struct scatterlist *sg;
758 int fragnob;
759
760 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
761
762 LASSERT (nob > 0);
763 LASSERT (nkiov > 0);
764 LASSERT (net != NULL);
765
766 while (offset >= kiov->kiov_len) {
767 offset -= kiov->kiov_len;
768 nkiov--;
769 kiov++;
770 LASSERT (nkiov > 0);
771 }
772
773 sg = tx->tx_frags;
774 do {
775 LASSERT (nkiov > 0);
776
777 fragnob = min((int)(kiov->kiov_len - offset), nob);
778
779 sg_set_page(sg, kiov->kiov_page, fragnob,
780 kiov->kiov_offset + offset);
781 sg++;
782
783 offset = 0;
784 kiov++;
785 nkiov--;
786 nob -= fragnob;
787 } while (nob > 0);
788
789 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
790 }
791
792 int
793 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
794 {
795 kib_msg_t *msg = tx->tx_msg;
796 kib_peer_t *peer = conn->ibc_peer;
797 int ver = conn->ibc_version;
798 int rc;
799 int done;
800 struct ib_send_wr *bad_wrq;
801
802 LASSERT (tx->tx_queued);
803 /* We rely on this for QP sizing */
804 LASSERT (tx->tx_nwrq > 0);
805 LASSERT (tx->tx_nwrq <= 1 + IBLND_RDMA_FRAGS(ver));
806
807 LASSERT (credit == 0 || credit == 1);
808 LASSERT (conn->ibc_outstanding_credits >= 0);
809 LASSERT (conn->ibc_outstanding_credits <= IBLND_MSG_QUEUE_SIZE(ver));
810 LASSERT (conn->ibc_credits >= 0);
811 LASSERT (conn->ibc_credits <= IBLND_MSG_QUEUE_SIZE(ver));
812
813 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
814 /* tx completions outstanding... */
815 CDEBUG(D_NET, "%s: posted enough\n",
816 libcfs_nid2str(peer->ibp_nid));
817 return -EAGAIN;
818 }
819
820 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
821 CDEBUG(D_NET, "%s: no credits\n",
822 libcfs_nid2str(peer->ibp_nid));
823 return -EAGAIN;
824 }
825
826 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
827 conn->ibc_credits == 1 && /* last credit reserved */
828 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
829 CDEBUG(D_NET, "%s: not using last credit\n",
830 libcfs_nid2str(peer->ibp_nid));
831 return -EAGAIN;
832 }
833
834 /* NB don't drop ibc_lock before bumping tx_sending */
835 list_del(&tx->tx_list);
836 tx->tx_queued = 0;
837
838 if (msg->ibm_type == IBLND_MSG_NOOP &&
839 (!kiblnd_need_noop(conn) || /* redundant NOOP */
840 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
841 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
842 /* OK to drop when posted enough NOOPs, since
843 * kiblnd_check_sends will queue NOOP again when
844 * posted NOOPs complete */
845 spin_unlock(&conn->ibc_lock);
846 kiblnd_tx_done(peer->ibp_ni, tx);
847 spin_lock(&conn->ibc_lock);
848 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
849 libcfs_nid2str(peer->ibp_nid),
850 conn->ibc_noops_posted);
851 return 0;
852 }
853
854 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
855 peer->ibp_nid, conn->ibc_incarnation);
856
857 conn->ibc_credits -= credit;
858 conn->ibc_outstanding_credits = 0;
859 conn->ibc_nsends_posted++;
860 if (msg->ibm_type == IBLND_MSG_NOOP)
861 conn->ibc_noops_posted++;
862
863 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
864 * PUT. If so, it was first queued here as a PUT_REQ, sent and
865 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
866 * and then re-queued here. It's (just) possible that
867 * tx_sending is non-zero if we've not done the tx_complete()
868 * from the first send; hence the ++ rather than = below. */
869 tx->tx_sending++;
870 list_add(&tx->tx_list, &conn->ibc_active_txs);
871
872 /* I'm still holding ibc_lock! */
873 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
874 rc = -ECONNABORTED;
875 } else if (tx->tx_pool->tpo_pool.po_failed ||
876 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
877 /* close_conn will launch failover */
878 rc = -ENETDOWN;
879 } else {
880 rc = ib_post_send(conn->ibc_cmid->qp,
881 tx->tx_wrq, &bad_wrq);
882 }
883
884 conn->ibc_last_send = jiffies;
885
886 if (rc == 0)
887 return 0;
888
889 /* NB credits are transferred in the actual
890 * message, which can only be the last work item */
891 conn->ibc_credits += credit;
892 conn->ibc_outstanding_credits += msg->ibm_credits;
893 conn->ibc_nsends_posted--;
894 if (msg->ibm_type == IBLND_MSG_NOOP)
895 conn->ibc_noops_posted--;
896
897 tx->tx_status = rc;
898 tx->tx_waiting = 0;
899 tx->tx_sending--;
900
901 done = (tx->tx_sending == 0);
902 if (done)
903 list_del(&tx->tx_list);
904
905 spin_unlock(&conn->ibc_lock);
906
907 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
908 CERROR("Error %d posting transmit to %s\n",
909 rc, libcfs_nid2str(peer->ibp_nid));
910 else
911 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
912 rc, libcfs_nid2str(peer->ibp_nid));
913
914 kiblnd_close_conn(conn, rc);
915
916 if (done)
917 kiblnd_tx_done(peer->ibp_ni, tx);
918
919 spin_lock(&conn->ibc_lock);
920
921 return -EIO;
922 }
923
924 void
925 kiblnd_check_sends (kib_conn_t *conn)
926 {
927 int ver = conn->ibc_version;
928 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
929 kib_tx_t *tx;
930
931 /* Don't send anything until after the connection is established */
932 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
933 CDEBUG(D_NET, "%s too soon\n",
934 libcfs_nid2str(conn->ibc_peer->ibp_nid));
935 return;
936 }
937
938 spin_lock(&conn->ibc_lock);
939
940 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
941 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
942 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
943 LASSERT (conn->ibc_reserved_credits >= 0);
944
945 while (conn->ibc_reserved_credits > 0 &&
946 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
947 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
948 kib_tx_t, tx_list);
949 list_del(&tx->tx_list);
950 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
951 conn->ibc_reserved_credits--;
952 }
953
954 if (kiblnd_need_noop(conn)) {
955 spin_unlock(&conn->ibc_lock);
956
957 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
958 if (tx != NULL)
959 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
960
961 spin_lock(&conn->ibc_lock);
962 if (tx != NULL)
963 kiblnd_queue_tx_locked(tx, conn);
964 }
965
966 kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */
967
968 for (;;) {
969 int credit;
970
971 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
972 credit = 0;
973 tx = list_entry(conn->ibc_tx_queue_nocred.next,
974 kib_tx_t, tx_list);
975 } else if (!list_empty(&conn->ibc_tx_noops)) {
976 LASSERT (!IBLND_OOB_CAPABLE(ver));
977 credit = 1;
978 tx = list_entry(conn->ibc_tx_noops.next,
979 kib_tx_t, tx_list);
980 } else if (!list_empty(&conn->ibc_tx_queue)) {
981 credit = 1;
982 tx = list_entry(conn->ibc_tx_queue.next,
983 kib_tx_t, tx_list);
984 } else
985 break;
986
987 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
988 break;
989 }
990
991 spin_unlock(&conn->ibc_lock);
992
993 kiblnd_conn_decref(conn); /* ...until here */
994 }
995
996 void
997 kiblnd_tx_complete (kib_tx_t *tx, int status)
998 {
999 int failed = (status != IB_WC_SUCCESS);
1000 kib_conn_t *conn = tx->tx_conn;
1001 int idle;
1002
1003 LASSERT (tx->tx_sending > 0);
1004
1005 if (failed) {
1006 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1007 CNETERR("Tx -> %s cookie "LPX64
1008 " sending %d waiting %d: failed %d\n",
1009 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1010 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1011 status);
1012
1013 kiblnd_close_conn(conn, -EIO);
1014 } else {
1015 kiblnd_peer_alive(conn->ibc_peer);
1016 }
1017
1018 spin_lock(&conn->ibc_lock);
1019
1020 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1021 * gets to free it, which also drops its ref on 'conn'. */
1022
1023 tx->tx_sending--;
1024 conn->ibc_nsends_posted--;
1025 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1026 conn->ibc_noops_posted--;
1027
1028 if (failed) {
1029 tx->tx_waiting = 0; /* don't wait for peer */
1030 tx->tx_status = -EIO;
1031 }
1032
1033 idle = (tx->tx_sending == 0) && /* This is the final callback */
1034 !tx->tx_waiting && /* Not waiting for peer */
1035 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1036 if (idle)
1037 list_del(&tx->tx_list);
1038
1039 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1040
1041 spin_unlock(&conn->ibc_lock);
1042
1043 if (idle)
1044 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1045
1046 kiblnd_check_sends(conn);
1047
1048 kiblnd_conn_decref(conn); /* ...until here */
1049 }
1050
1051 void
1052 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1053 {
1054 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1055 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1056 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1057 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1058 struct ib_mr *mr;
1059
1060 LASSERT (tx->tx_nwrq >= 0);
1061 LASSERT (tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1062 LASSERT (nob <= IBLND_MSG_SIZE);
1063
1064 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1065
1066 mr = kiblnd_find_dma_mr(hdev, tx->tx_msgaddr, nob);
1067 LASSERT (mr != NULL);
1068
1069 sge->lkey = mr->lkey;
1070 sge->addr = tx->tx_msgaddr;
1071 sge->length = nob;
1072
1073 memset(wrq, 0, sizeof(*wrq));
1074
1075 wrq->next = NULL;
1076 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1077 wrq->sg_list = sge;
1078 wrq->num_sge = 1;
1079 wrq->opcode = IB_WR_SEND;
1080 wrq->send_flags = IB_SEND_SIGNALED;
1081
1082 tx->tx_nwrq++;
1083 }
1084
1085 int
1086 kiblnd_init_rdma (kib_conn_t *conn, kib_tx_t *tx, int type,
1087 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1088 {
1089 kib_msg_t *ibmsg = tx->tx_msg;
1090 kib_rdma_desc_t *srcrd = tx->tx_rd;
1091 struct ib_sge *sge = &tx->tx_sge[0];
1092 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1093 int rc = resid;
1094 int srcidx;
1095 int dstidx;
1096 int wrknob;
1097
1098 LASSERT (!in_interrupt());
1099 LASSERT (tx->tx_nwrq == 0);
1100 LASSERT (type == IBLND_MSG_GET_DONE ||
1101 type == IBLND_MSG_PUT_DONE);
1102
1103 srcidx = dstidx = 0;
1104
1105 while (resid > 0) {
1106 if (srcidx >= srcrd->rd_nfrags) {
1107 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1108 rc = -EPROTO;
1109 break;
1110 }
1111
1112 if (dstidx == dstrd->rd_nfrags) {
1113 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1114 rc = -EPROTO;
1115 break;
1116 }
1117
1118 if (tx->tx_nwrq == IBLND_RDMA_FRAGS(conn->ibc_version)) {
1119 CERROR("RDMA too fragmented for %s (%d): "
1120 "%d/%d src %d/%d dst frags\n",
1121 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1122 IBLND_RDMA_FRAGS(conn->ibc_version),
1123 srcidx, srcrd->rd_nfrags,
1124 dstidx, dstrd->rd_nfrags);
1125 rc = -EMSGSIZE;
1126 break;
1127 }
1128
1129 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1130 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1131
1132 sge = &tx->tx_sge[tx->tx_nwrq];
1133 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1134 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1135 sge->length = wrknob;
1136
1137 wrq = &tx->tx_wrq[tx->tx_nwrq];
1138
1139 wrq->next = wrq + 1;
1140 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1141 wrq->sg_list = sge;
1142 wrq->num_sge = 1;
1143 wrq->opcode = IB_WR_RDMA_WRITE;
1144 wrq->send_flags = 0;
1145
1146 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1147 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1148
1149 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1150 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1151
1152 resid -= wrknob;
1153
1154 tx->tx_nwrq++;
1155 wrq++;
1156 sge++;
1157 }
1158
1159 if (rc < 0) /* no RDMA if completing with failure */
1160 tx->tx_nwrq = 0;
1161
1162 ibmsg->ibm_u.completion.ibcm_status = rc;
1163 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1164 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1165 type, sizeof (kib_completion_msg_t));
1166
1167 return rc;
1168 }
1169
1170 void
1171 kiblnd_queue_tx_locked (kib_tx_t *tx, kib_conn_t *conn)
1172 {
1173 struct list_head *q;
1174
1175 LASSERT (tx->tx_nwrq > 0); /* work items set up */
1176 LASSERT (!tx->tx_queued); /* not queued for sending already */
1177 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1178
1179 tx->tx_queued = 1;
1180 tx->tx_deadline = jiffies + (*kiblnd_tunables.kib_timeout * HZ);
1181
1182 if (tx->tx_conn == NULL) {
1183 kiblnd_conn_addref(conn);
1184 tx->tx_conn = conn;
1185 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1186 } else {
1187 /* PUT_DONE first attached to conn as a PUT_REQ */
1188 LASSERT (tx->tx_conn == conn);
1189 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1190 }
1191
1192 switch (tx->tx_msg->ibm_type) {
1193 default:
1194 LBUG();
1195
1196 case IBLND_MSG_PUT_REQ:
1197 case IBLND_MSG_GET_REQ:
1198 q = &conn->ibc_tx_queue_rsrvd;
1199 break;
1200
1201 case IBLND_MSG_PUT_NAK:
1202 case IBLND_MSG_PUT_ACK:
1203 case IBLND_MSG_PUT_DONE:
1204 case IBLND_MSG_GET_DONE:
1205 q = &conn->ibc_tx_queue_nocred;
1206 break;
1207
1208 case IBLND_MSG_NOOP:
1209 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1210 q = &conn->ibc_tx_queue_nocred;
1211 else
1212 q = &conn->ibc_tx_noops;
1213 break;
1214
1215 case IBLND_MSG_IMMEDIATE:
1216 q = &conn->ibc_tx_queue;
1217 break;
1218 }
1219
1220 list_add_tail(&tx->tx_list, q);
1221 }
1222
1223 void
1224 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1225 {
1226 spin_lock(&conn->ibc_lock);
1227 kiblnd_queue_tx_locked(tx, conn);
1228 spin_unlock(&conn->ibc_lock);
1229
1230 kiblnd_check_sends(conn);
1231 }
1232
1233 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1234 struct sockaddr_in *srcaddr,
1235 struct sockaddr_in *dstaddr,
1236 int timeout_ms)
1237 {
1238 unsigned short port;
1239 int rc;
1240
1241 /* allow the port to be reused */
1242 rc = rdma_set_reuseaddr(cmid, 1);
1243 if (rc != 0) {
1244 CERROR("Unable to set reuse on cmid: %d\n", rc);
1245 return rc;
1246 }
1247
1248 /* look for a free privileged port */
1249 for (port = PROT_SOCK-1; port > 0; port--) {
1250 srcaddr->sin_port = htons(port);
1251 rc = rdma_resolve_addr(cmid,
1252 (struct sockaddr *)srcaddr,
1253 (struct sockaddr *)dstaddr,
1254 timeout_ms);
1255 if (rc == 0) {
1256 CDEBUG(D_NET, "bound to port %hu\n", port);
1257 return 0;
1258 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1259 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1260 port, rc);
1261 } else {
1262 return rc;
1263 }
1264 }
1265
1266 CERROR("Failed to bind to a free privileged port\n");
1267 return rc;
1268 }
1269
1270 void
1271 kiblnd_connect_peer (kib_peer_t *peer)
1272 {
1273 struct rdma_cm_id *cmid;
1274 kib_dev_t *dev;
1275 kib_net_t *net = peer->ibp_ni->ni_data;
1276 struct sockaddr_in srcaddr;
1277 struct sockaddr_in dstaddr;
1278 int rc;
1279
1280 LASSERT (net != NULL);
1281 LASSERT (peer->ibp_connecting > 0);
1282
1283 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1284 IB_QPT_RC);
1285
1286 if (IS_ERR(cmid)) {
1287 CERROR("Can't create CMID for %s: %ld\n",
1288 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1289 rc = PTR_ERR(cmid);
1290 goto failed;
1291 }
1292
1293 dev = net->ibn_dev;
1294 memset(&srcaddr, 0, sizeof(srcaddr));
1295 srcaddr.sin_family = AF_INET;
1296 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1297
1298 memset(&dstaddr, 0, sizeof(dstaddr));
1299 dstaddr.sin_family = AF_INET;
1300 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1301 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1302
1303 kiblnd_peer_addref(peer); /* cmid's ref */
1304
1305 if (*kiblnd_tunables.kib_use_priv_port) {
1306 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1307 *kiblnd_tunables.kib_timeout * 1000);
1308 } else {
1309 rc = rdma_resolve_addr(cmid,
1310 (struct sockaddr *)&srcaddr,
1311 (struct sockaddr *)&dstaddr,
1312 *kiblnd_tunables.kib_timeout * 1000);
1313 }
1314 if (rc != 0) {
1315 /* Can't initiate address resolution: */
1316 CERROR("Can't resolve addr for %s: %d\n",
1317 libcfs_nid2str(peer->ibp_nid), rc);
1318 goto failed2;
1319 }
1320
1321 LASSERT (cmid->device != NULL);
1322 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1323 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1324 &dev->ibd_ifip, cmid->device->name);
1325
1326 return;
1327
1328 failed2:
1329 kiblnd_peer_decref(peer); /* cmid's ref */
1330 rdma_destroy_id(cmid);
1331 failed:
1332 kiblnd_peer_connect_failed(peer, 1, rc);
1333 }
1334
1335 void
1336 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1337 {
1338 kib_peer_t *peer;
1339 kib_peer_t *peer2;
1340 kib_conn_t *conn;
1341 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1342 unsigned long flags;
1343 int rc;
1344
1345 /* If I get here, I've committed to send, so I complete the tx with
1346 * failure on any problems */
1347
1348 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1349 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1350
1351 /* First time, just use a read lock since I expect to find my peer
1352 * connected */
1353 read_lock_irqsave(g_lock, flags);
1354
1355 peer = kiblnd_find_peer_locked(nid);
1356 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1357 /* Found a peer with an established connection */
1358 conn = kiblnd_get_conn_locked(peer);
1359 kiblnd_conn_addref(conn); /* 1 ref for me... */
1360
1361 read_unlock_irqrestore(g_lock, flags);
1362
1363 if (tx != NULL)
1364 kiblnd_queue_tx(tx, conn);
1365 kiblnd_conn_decref(conn); /* ...to here */
1366 return;
1367 }
1368
1369 read_unlock(g_lock);
1370 /* Re-try with a write lock */
1371 write_lock(g_lock);
1372
1373 peer = kiblnd_find_peer_locked(nid);
1374 if (peer != NULL) {
1375 if (list_empty(&peer->ibp_conns)) {
1376 /* found a peer, but it's still connecting... */
1377 LASSERT (peer->ibp_connecting != 0 ||
1378 peer->ibp_accepting != 0);
1379 if (tx != NULL)
1380 list_add_tail(&tx->tx_list,
1381 &peer->ibp_tx_queue);
1382 write_unlock_irqrestore(g_lock, flags);
1383 } else {
1384 conn = kiblnd_get_conn_locked(peer);
1385 kiblnd_conn_addref(conn); /* 1 ref for me... */
1386
1387 write_unlock_irqrestore(g_lock, flags);
1388
1389 if (tx != NULL)
1390 kiblnd_queue_tx(tx, conn);
1391 kiblnd_conn_decref(conn); /* ...to here */
1392 }
1393 return;
1394 }
1395
1396 write_unlock_irqrestore(g_lock, flags);
1397
1398 /* Allocate a peer ready to add to the peer table and retry */
1399 rc = kiblnd_create_peer(ni, &peer, nid);
1400 if (rc != 0) {
1401 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1402 if (tx != NULL) {
1403 tx->tx_status = -EHOSTUNREACH;
1404 tx->tx_waiting = 0;
1405 kiblnd_tx_done(ni, tx);
1406 }
1407 return;
1408 }
1409
1410 write_lock_irqsave(g_lock, flags);
1411
1412 peer2 = kiblnd_find_peer_locked(nid);
1413 if (peer2 != NULL) {
1414 if (list_empty(&peer2->ibp_conns)) {
1415 /* found a peer, but it's still connecting... */
1416 LASSERT (peer2->ibp_connecting != 0 ||
1417 peer2->ibp_accepting != 0);
1418 if (tx != NULL)
1419 list_add_tail(&tx->tx_list,
1420 &peer2->ibp_tx_queue);
1421 write_unlock_irqrestore(g_lock, flags);
1422 } else {
1423 conn = kiblnd_get_conn_locked(peer2);
1424 kiblnd_conn_addref(conn); /* 1 ref for me... */
1425
1426 write_unlock_irqrestore(g_lock, flags);
1427
1428 if (tx != NULL)
1429 kiblnd_queue_tx(tx, conn);
1430 kiblnd_conn_decref(conn); /* ...to here */
1431 }
1432
1433 kiblnd_peer_decref(peer);
1434 return;
1435 }
1436
1437 /* Brand new peer */
1438 LASSERT (peer->ibp_connecting == 0);
1439 peer->ibp_connecting = 1;
1440
1441 /* always called with a ref on ni, which prevents ni being shutdown */
1442 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1443
1444 if (tx != NULL)
1445 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1446
1447 kiblnd_peer_addref(peer);
1448 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1449
1450 write_unlock_irqrestore(g_lock, flags);
1451
1452 kiblnd_connect_peer(peer);
1453 kiblnd_peer_decref(peer);
1454 }
1455
1456 int
1457 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1458 {
1459 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1460 int type = lntmsg->msg_type;
1461 lnet_process_id_t target = lntmsg->msg_target;
1462 int target_is_router = lntmsg->msg_target_is_router;
1463 int routing = lntmsg->msg_routing;
1464 unsigned int payload_niov = lntmsg->msg_niov;
1465 struct iovec *payload_iov = lntmsg->msg_iov;
1466 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1467 unsigned int payload_offset = lntmsg->msg_offset;
1468 unsigned int payload_nob = lntmsg->msg_len;
1469 kib_msg_t *ibmsg;
1470 kib_tx_t *tx;
1471 int nob;
1472 int rc;
1473
1474 /* NB 'private' is different depending on what we're sending.... */
1475
1476 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1477 payload_nob, payload_niov, libcfs_id2str(target));
1478
1479 LASSERT (payload_nob == 0 || payload_niov > 0);
1480 LASSERT (payload_niov <= LNET_MAX_IOV);
1481
1482 /* Thread context */
1483 LASSERT (!in_interrupt());
1484 /* payload is either all vaddrs or all pages */
1485 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1486
1487 switch (type) {
1488 default:
1489 LBUG();
1490 return (-EIO);
1491
1492 case LNET_MSG_ACK:
1493 LASSERT (payload_nob == 0);
1494 break;
1495
1496 case LNET_MSG_GET:
1497 if (routing || target_is_router)
1498 break; /* send IMMEDIATE */
1499
1500 /* is the REPLY message too small for RDMA? */
1501 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1502 if (nob <= IBLND_MSG_SIZE)
1503 break; /* send IMMEDIATE */
1504
1505 tx = kiblnd_get_idle_tx(ni, target.nid);
1506 if (tx == NULL) {
1507 CERROR("Can't allocate txd for GET to %s\n",
1508 libcfs_nid2str(target.nid));
1509 return -ENOMEM;
1510 }
1511
1512 ibmsg = tx->tx_msg;
1513
1514 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1515 rc = kiblnd_setup_rd_iov(ni, tx,
1516 &ibmsg->ibm_u.get.ibgm_rd,
1517 lntmsg->msg_md->md_niov,
1518 lntmsg->msg_md->md_iov.iov,
1519 0, lntmsg->msg_md->md_length);
1520 else
1521 rc = kiblnd_setup_rd_kiov(ni, tx,
1522 &ibmsg->ibm_u.get.ibgm_rd,
1523 lntmsg->msg_md->md_niov,
1524 lntmsg->msg_md->md_iov.kiov,
1525 0, lntmsg->msg_md->md_length);
1526 if (rc != 0) {
1527 CERROR("Can't setup GET sink for %s: %d\n",
1528 libcfs_nid2str(target.nid), rc);
1529 kiblnd_tx_done(ni, tx);
1530 return -EIO;
1531 }
1532
1533 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[tx->tx_nfrags]);
1534 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1535 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1536
1537 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1538
1539 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1540 if (tx->tx_lntmsg[1] == NULL) {
1541 CERROR("Can't create reply for GET -> %s\n",
1542 libcfs_nid2str(target.nid));
1543 kiblnd_tx_done(ni, tx);
1544 return -EIO;
1545 }
1546
1547 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1548 tx->tx_waiting = 1; /* waiting for GET_DONE */
1549 kiblnd_launch_tx(ni, tx, target.nid);
1550 return 0;
1551
1552 case LNET_MSG_REPLY:
1553 case LNET_MSG_PUT:
1554 /* Is the payload small enough not to need RDMA? */
1555 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1556 if (nob <= IBLND_MSG_SIZE)
1557 break; /* send IMMEDIATE */
1558
1559 tx = kiblnd_get_idle_tx(ni, target.nid);
1560 if (tx == NULL) {
1561 CERROR("Can't allocate %s txd for %s\n",
1562 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1563 libcfs_nid2str(target.nid));
1564 return -ENOMEM;
1565 }
1566
1567 if (payload_kiov == NULL)
1568 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1569 payload_niov, payload_iov,
1570 payload_offset, payload_nob);
1571 else
1572 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1573 payload_niov, payload_kiov,
1574 payload_offset, payload_nob);
1575 if (rc != 0) {
1576 CERROR("Can't setup PUT src for %s: %d\n",
1577 libcfs_nid2str(target.nid), rc);
1578 kiblnd_tx_done(ni, tx);
1579 return -EIO;
1580 }
1581
1582 ibmsg = tx->tx_msg;
1583 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1584 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1585 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1586
1587 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1588 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1589 kiblnd_launch_tx(ni, tx, target.nid);
1590 return 0;
1591 }
1592
1593 /* send IMMEDIATE */
1594
1595 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1596 <= IBLND_MSG_SIZE);
1597
1598 tx = kiblnd_get_idle_tx(ni, target.nid);
1599 if (tx == NULL) {
1600 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1601 type, libcfs_nid2str(target.nid));
1602 return -ENOMEM;
1603 }
1604
1605 ibmsg = tx->tx_msg;
1606 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1607
1608 if (payload_kiov != NULL)
1609 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1610 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1611 payload_niov, payload_kiov,
1612 payload_offset, payload_nob);
1613 else
1614 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1615 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1616 payload_niov, payload_iov,
1617 payload_offset, payload_nob);
1618
1619 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1620 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1621
1622 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1623 kiblnd_launch_tx(ni, tx, target.nid);
1624 return 0;
1625 }
1626
1627 void
1628 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1629 {
1630 lnet_process_id_t target = lntmsg->msg_target;
1631 unsigned int niov = lntmsg->msg_niov;
1632 struct iovec *iov = lntmsg->msg_iov;
1633 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1634 unsigned int offset = lntmsg->msg_offset;
1635 unsigned int nob = lntmsg->msg_len;
1636 kib_tx_t *tx;
1637 int rc;
1638
1639 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1640 if (tx == NULL) {
1641 CERROR("Can't get tx for REPLY to %s\n",
1642 libcfs_nid2str(target.nid));
1643 goto failed_0;
1644 }
1645
1646 if (nob == 0)
1647 rc = 0;
1648 else if (kiov == NULL)
1649 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1650 niov, iov, offset, nob);
1651 else
1652 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1653 niov, kiov, offset, nob);
1654
1655 if (rc != 0) {
1656 CERROR("Can't setup GET src for %s: %d\n",
1657 libcfs_nid2str(target.nid), rc);
1658 goto failed_1;
1659 }
1660
1661 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1662 IBLND_MSG_GET_DONE, nob,
1663 &rx->rx_msg->ibm_u.get.ibgm_rd,
1664 rx->rx_msg->ibm_u.get.ibgm_cookie);
1665 if (rc < 0) {
1666 CERROR("Can't setup rdma for GET from %s: %d\n",
1667 libcfs_nid2str(target.nid), rc);
1668 goto failed_1;
1669 }
1670
1671 if (nob == 0) {
1672 /* No RDMA: local completion may happen now! */
1673 lnet_finalize(ni, lntmsg, 0);
1674 } else {
1675 /* RDMA: lnet_finalize(lntmsg) when it
1676 * completes */
1677 tx->tx_lntmsg[0] = lntmsg;
1678 }
1679
1680 kiblnd_queue_tx(tx, rx->rx_conn);
1681 return;
1682
1683 failed_1:
1684 kiblnd_tx_done(ni, tx);
1685 failed_0:
1686 lnet_finalize(ni, lntmsg, -EIO);
1687 }
1688
1689 int
1690 kiblnd_recv (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1691 unsigned int niov, struct iovec *iov, lnet_kiov_t *kiov,
1692 unsigned int offset, unsigned int mlen, unsigned int rlen)
1693 {
1694 kib_rx_t *rx = private;
1695 kib_msg_t *rxmsg = rx->rx_msg;
1696 kib_conn_t *conn = rx->rx_conn;
1697 kib_tx_t *tx;
1698 kib_msg_t *txmsg;
1699 int nob;
1700 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1701 int rc = 0;
1702
1703 LASSERT (mlen <= rlen);
1704 LASSERT (!in_interrupt());
1705 /* Either all pages or all vaddrs */
1706 LASSERT (!(kiov != NULL && iov != NULL));
1707
1708 switch (rxmsg->ibm_type) {
1709 default:
1710 LBUG();
1711
1712 case IBLND_MSG_IMMEDIATE:
1713 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1714 if (nob > rx->rx_nob) {
1715 CERROR ("Immediate message from %s too big: %d(%d)\n",
1716 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1717 nob, rx->rx_nob);
1718 rc = -EPROTO;
1719 break;
1720 }
1721
1722 if (kiov != NULL)
1723 lnet_copy_flat2kiov(niov, kiov, offset,
1724 IBLND_MSG_SIZE, rxmsg,
1725 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1726 mlen);
1727 else
1728 lnet_copy_flat2iov(niov, iov, offset,
1729 IBLND_MSG_SIZE, rxmsg,
1730 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1731 mlen);
1732 lnet_finalize (ni, lntmsg, 0);
1733 break;
1734
1735 case IBLND_MSG_PUT_REQ:
1736 if (mlen == 0) {
1737 lnet_finalize(ni, lntmsg, 0);
1738 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1739 rxmsg->ibm_u.putreq.ibprm_cookie);
1740 break;
1741 }
1742
1743 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1744 if (tx == NULL) {
1745 CERROR("Can't allocate tx for %s\n",
1746 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1747 /* Not replying will break the connection */
1748 rc = -ENOMEM;
1749 break;
1750 }
1751
1752 txmsg = tx->tx_msg;
1753 if (kiov == NULL)
1754 rc = kiblnd_setup_rd_iov(ni, tx,
1755 &txmsg->ibm_u.putack.ibpam_rd,
1756 niov, iov, offset, mlen);
1757 else
1758 rc = kiblnd_setup_rd_kiov(ni, tx,
1759 &txmsg->ibm_u.putack.ibpam_rd,
1760 niov, kiov, offset, mlen);
1761 if (rc != 0) {
1762 CERROR("Can't setup PUT sink for %s: %d\n",
1763 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1764 kiblnd_tx_done(ni, tx);
1765 /* tell peer it's over */
1766 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1767 rxmsg->ibm_u.putreq.ibprm_cookie);
1768 break;
1769 }
1770
1771 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[tx->tx_nfrags]);
1772 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1773 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1774
1775 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1776
1777 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1778 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1779 kiblnd_queue_tx(tx, conn);
1780
1781 /* reposted buffer reserved for PUT_DONE */
1782 post_credit = IBLND_POSTRX_NO_CREDIT;
1783 break;
1784
1785 case IBLND_MSG_GET_REQ:
1786 if (lntmsg != NULL) {
1787 /* Optimized GET; RDMA lntmsg's payload */
1788 kiblnd_reply(ni, rx, lntmsg);
1789 } else {
1790 /* GET didn't match anything */
1791 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1792 -ENODATA,
1793 rxmsg->ibm_u.get.ibgm_cookie);
1794 }
1795 break;
1796 }
1797
1798 kiblnd_post_rx(rx, post_credit);
1799 return rc;
1800 }
1801
1802 int
1803 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1804 {
1805 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1806
1807 if (IS_ERR(task))
1808 return PTR_ERR(task);
1809
1810 atomic_inc(&kiblnd_data.kib_nthreads);
1811 return 0;
1812 }
1813
1814 void
1815 kiblnd_thread_fini (void)
1816 {
1817 atomic_dec (&kiblnd_data.kib_nthreads);
1818 }
1819
1820 void
1821 kiblnd_peer_alive (kib_peer_t *peer)
1822 {
1823 /* This is racy, but everyone's only writing cfs_time_current() */
1824 peer->ibp_last_alive = cfs_time_current();
1825 mb();
1826 }
1827
1828 void
1829 kiblnd_peer_notify (kib_peer_t *peer)
1830 {
1831 int error = 0;
1832 cfs_time_t last_alive = 0;
1833 unsigned long flags;
1834
1835 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1836
1837 if (list_empty(&peer->ibp_conns) &&
1838 peer->ibp_accepting == 0 &&
1839 peer->ibp_connecting == 0 &&
1840 peer->ibp_error != 0) {
1841 error = peer->ibp_error;
1842 peer->ibp_error = 0;
1843
1844 last_alive = peer->ibp_last_alive;
1845 }
1846
1847 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1848
1849 if (error != 0)
1850 lnet_notify(peer->ibp_ni,
1851 peer->ibp_nid, 0, last_alive);
1852 }
1853
1854 void
1855 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1856 {
1857 /* This just does the immediate housekeeping. 'error' is zero for a
1858 * normal shutdown which can happen only after the connection has been
1859 * established. If the connection is established, schedule the
1860 * connection to be finished off by the connd. Otherwise the connd is
1861 * already dealing with it (either to set it up or tear it down).
1862 * Caller holds kib_global_lock exclusively in irq context */
1863 kib_peer_t *peer = conn->ibc_peer;
1864 kib_dev_t *dev;
1865 unsigned long flags;
1866
1867 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1868
1869 if (error != 0 && conn->ibc_comms_error == 0)
1870 conn->ibc_comms_error = error;
1871
1872 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1873 return; /* already being handled */
1874
1875 if (error == 0 &&
1876 list_empty(&conn->ibc_tx_noops) &&
1877 list_empty(&conn->ibc_tx_queue) &&
1878 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1879 list_empty(&conn->ibc_tx_queue_nocred) &&
1880 list_empty(&conn->ibc_active_txs)) {
1881 CDEBUG(D_NET, "closing conn to %s\n",
1882 libcfs_nid2str(peer->ibp_nid));
1883 } else {
1884 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1885 libcfs_nid2str(peer->ibp_nid), error,
1886 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1887 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1888 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1889 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1890 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1891 }
1892
1893 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1894 list_del(&conn->ibc_list);
1895 /* connd (see below) takes over ibc_list's ref */
1896
1897 if (list_empty (&peer->ibp_conns) && /* no more conns */
1898 kiblnd_peer_active(peer)) { /* still in peer table */
1899 kiblnd_unlink_peer_locked(peer);
1900
1901 /* set/clear error on last conn */
1902 peer->ibp_error = conn->ibc_comms_error;
1903 }
1904
1905 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1906
1907 if (error != 0 &&
1908 kiblnd_dev_can_failover(dev)) {
1909 list_add_tail(&dev->ibd_fail_list,
1910 &kiblnd_data.kib_failed_devs);
1911 wake_up(&kiblnd_data.kib_failover_waitq);
1912 }
1913
1914 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1915
1916 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1917 wake_up(&kiblnd_data.kib_connd_waitq);
1918
1919 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1920 }
1921
1922 void
1923 kiblnd_close_conn(kib_conn_t *conn, int error)
1924 {
1925 unsigned long flags;
1926
1927 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1928
1929 kiblnd_close_conn_locked(conn, error);
1930
1931 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1932 }
1933
1934 void
1935 kiblnd_handle_early_rxs(kib_conn_t *conn)
1936 {
1937 unsigned long flags;
1938 kib_rx_t *rx;
1939
1940 LASSERT(!in_interrupt());
1941 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1942
1943 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1944 while (!list_empty(&conn->ibc_early_rxs)) {
1945 rx = list_entry(conn->ibc_early_rxs.next,
1946 kib_rx_t, rx_list);
1947 list_del(&rx->rx_list);
1948 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1949
1950 kiblnd_handle_rx(rx);
1951
1952 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1953 }
1954 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1955 }
1956
1957 void
1958 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1959 {
1960 LIST_HEAD (zombies);
1961 struct list_head *tmp;
1962 struct list_head *nxt;
1963 kib_tx_t *tx;
1964
1965 spin_lock(&conn->ibc_lock);
1966
1967 list_for_each_safe (tmp, nxt, txs) {
1968 tx = list_entry (tmp, kib_tx_t, tx_list);
1969
1970 if (txs == &conn->ibc_active_txs) {
1971 LASSERT (!tx->tx_queued);
1972 LASSERT (tx->tx_waiting ||
1973 tx->tx_sending != 0);
1974 } else {
1975 LASSERT (tx->tx_queued);
1976 }
1977
1978 tx->tx_status = -ECONNABORTED;
1979 tx->tx_waiting = 0;
1980
1981 if (tx->tx_sending == 0) {
1982 tx->tx_queued = 0;
1983 list_del (&tx->tx_list);
1984 list_add (&tx->tx_list, &zombies);
1985 }
1986 }
1987
1988 spin_unlock(&conn->ibc_lock);
1989
1990 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
1991 }
1992
1993 void
1994 kiblnd_finalise_conn (kib_conn_t *conn)
1995 {
1996 LASSERT (!in_interrupt());
1997 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
1998
1999 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2000
2001 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2002 * for connections that didn't get as far as being connected, because
2003 * rdma_disconnect() does this for free. */
2004 kiblnd_abort_receives(conn);
2005
2006 /* Complete all tx descs not waiting for sends to complete.
2007 * NB we should be safe from RDMA now that the QP has changed state */
2008
2009 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2010 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2011 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2012 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2013 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2014
2015 kiblnd_handle_early_rxs(conn);
2016 }
2017
2018 void
2019 kiblnd_peer_connect_failed (kib_peer_t *peer, int active, int error)
2020 {
2021 LIST_HEAD (zombies);
2022 unsigned long flags;
2023
2024 LASSERT (error != 0);
2025 LASSERT (!in_interrupt());
2026
2027 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2028
2029 if (active) {
2030 LASSERT (peer->ibp_connecting > 0);
2031 peer->ibp_connecting--;
2032 } else {
2033 LASSERT (peer->ibp_accepting > 0);
2034 peer->ibp_accepting--;
2035 }
2036
2037 if (peer->ibp_connecting != 0 ||
2038 peer->ibp_accepting != 0) {
2039 /* another connection attempt under way... */
2040 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2041 flags);
2042 return;
2043 }
2044
2045 if (list_empty(&peer->ibp_conns)) {
2046 /* Take peer's blocked transmits to complete with error */
2047 list_add(&zombies, &peer->ibp_tx_queue);
2048 list_del_init(&peer->ibp_tx_queue);
2049
2050 if (kiblnd_peer_active(peer))
2051 kiblnd_unlink_peer_locked(peer);
2052
2053 peer->ibp_error = error;
2054 } else {
2055 /* Can't have blocked transmits if there are connections */
2056 LASSERT (list_empty(&peer->ibp_tx_queue));
2057 }
2058
2059 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2060
2061 kiblnd_peer_notify(peer);
2062
2063 if (list_empty (&zombies))
2064 return;
2065
2066 CNETERR("Deleting messages for %s: connection failed\n",
2067 libcfs_nid2str(peer->ibp_nid));
2068
2069 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2070 }
2071
2072 void
2073 kiblnd_connreq_done(kib_conn_t *conn, int status)
2074 {
2075 kib_peer_t *peer = conn->ibc_peer;
2076 kib_tx_t *tx;
2077 struct list_head txs;
2078 unsigned long flags;
2079 int active;
2080
2081 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2082
2083 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2084 libcfs_nid2str(peer->ibp_nid), active,
2085 conn->ibc_version, status);
2086
2087 LASSERT (!in_interrupt());
2088 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2089 peer->ibp_connecting > 0) ||
2090 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2091 peer->ibp_accepting > 0));
2092
2093 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2094 conn->ibc_connvars = NULL;
2095
2096 if (status != 0) {
2097 /* failed to establish connection */
2098 kiblnd_peer_connect_failed(peer, active, status);
2099 kiblnd_finalise_conn(conn);
2100 return;
2101 }
2102
2103 /* connection established */
2104 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2105
2106 conn->ibc_last_send = jiffies;
2107 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2108 kiblnd_peer_alive(peer);
2109
2110 /* Add conn to peer's list and nuke any dangling conns from a different
2111 * peer instance... */
2112 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2113 list_add(&conn->ibc_list, &peer->ibp_conns);
2114 if (active)
2115 peer->ibp_connecting--;
2116 else
2117 peer->ibp_accepting--;
2118
2119 if (peer->ibp_version == 0) {
2120 peer->ibp_version = conn->ibc_version;
2121 peer->ibp_incarnation = conn->ibc_incarnation;
2122 }
2123
2124 if (peer->ibp_version != conn->ibc_version ||
2125 peer->ibp_incarnation != conn->ibc_incarnation) {
2126 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2127 conn->ibc_incarnation);
2128 peer->ibp_version = conn->ibc_version;
2129 peer->ibp_incarnation = conn->ibc_incarnation;
2130 }
2131
2132 /* grab pending txs while I have the lock */
2133 list_add(&txs, &peer->ibp_tx_queue);
2134 list_del_init(&peer->ibp_tx_queue);
2135
2136 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2137 conn->ibc_comms_error != 0) { /* error has happened already */
2138 lnet_ni_t *ni = peer->ibp_ni;
2139
2140 /* start to shut down connection */
2141 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2142 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2143
2144 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2145
2146 return;
2147 }
2148
2149 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2150
2151 /* Schedule blocked txs */
2152 spin_lock(&conn->ibc_lock);
2153 while (!list_empty(&txs)) {
2154 tx = list_entry(txs.next, kib_tx_t, tx_list);
2155 list_del(&tx->tx_list);
2156
2157 kiblnd_queue_tx_locked(tx, conn);
2158 }
2159 spin_unlock(&conn->ibc_lock);
2160
2161 kiblnd_check_sends(conn);
2162
2163 /* schedule blocked rxs */
2164 kiblnd_handle_early_rxs(conn);
2165 }
2166
2167 void
2168 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2169 {
2170 int rc;
2171
2172 rc = rdma_reject(cmid, rej, sizeof(*rej));
2173
2174 if (rc != 0)
2175 CWARN("Error %d sending reject\n", rc);
2176 }
2177
2178 int
2179 kiblnd_passive_connect (struct rdma_cm_id *cmid, void *priv, int priv_nob)
2180 {
2181 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2182 kib_msg_t *reqmsg = priv;
2183 kib_msg_t *ackmsg;
2184 kib_dev_t *ibdev;
2185 kib_peer_t *peer;
2186 kib_peer_t *peer2;
2187 kib_conn_t *conn;
2188 lnet_ni_t *ni = NULL;
2189 kib_net_t *net = NULL;
2190 lnet_nid_t nid;
2191 struct rdma_conn_param cp;
2192 kib_rej_t rej;
2193 int version = IBLND_MSG_VERSION;
2194 unsigned long flags;
2195 int rc;
2196 struct sockaddr_in *peer_addr;
2197 LASSERT (!in_interrupt());
2198
2199 /* cmid inherits 'context' from the corresponding listener id */
2200 ibdev = (kib_dev_t *)cmid->context;
2201 LASSERT (ibdev != NULL);
2202
2203 memset(&rej, 0, sizeof(rej));
2204 rej.ibr_magic = IBLND_MSG_MAGIC;
2205 rej.ibr_why = IBLND_REJECT_FATAL;
2206 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2207
2208 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2209 if (*kiblnd_tunables.kib_require_priv_port &&
2210 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2211 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2212 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2213 &ip, ntohs(peer_addr->sin_port));
2214 goto failed;
2215 }
2216
2217 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2218 CERROR("Short connection request\n");
2219 goto failed;
2220 }
2221
2222 /* Future protocol version compatibility support! If the
2223 * o2iblnd-specific protocol changes, or when LNET unifies
2224 * protocols over all LNDs, the initial connection will
2225 * negotiate a protocol version. I trap this here to avoid
2226 * console errors; the reject tells the peer which protocol I
2227 * speak. */
2228 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2229 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2230 goto failed;
2231 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2232 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2233 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2234 goto failed;
2235 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2236 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2237 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2238 goto failed;
2239
2240 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2241 if (rc != 0) {
2242 CERROR("Can't parse connection request: %d\n", rc);
2243 goto failed;
2244 }
2245
2246 nid = reqmsg->ibm_srcnid;
2247 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2248
2249 if (ni != NULL) {
2250 net = (kib_net_t *)ni->ni_data;
2251 rej.ibr_incarnation = net->ibn_incarnation;
2252 }
2253
2254 if (ni == NULL || /* no matching net */
2255 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2256 net->ibn_dev != ibdev) { /* wrong device */
2257 CERROR("Can't accept %s on %s (%s:%d:%pI4h): "
2258 "bad dst nid %s\n", libcfs_nid2str(nid),
2259 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2260 ibdev->ibd_ifname, ibdev->ibd_nnets,
2261 &ibdev->ibd_ifip,
2262 libcfs_nid2str(reqmsg->ibm_dstnid));
2263
2264 goto failed;
2265 }
2266
2267 /* check time stamp as soon as possible */
2268 if (reqmsg->ibm_dststamp != 0 &&
2269 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2270 CWARN("Stale connection request\n");
2271 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2272 goto failed;
2273 }
2274
2275 /* I can accept peer's version */
2276 version = reqmsg->ibm_version;
2277
2278 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2279 CERROR("Unexpected connreq msg type: %x from %s\n",
2280 reqmsg->ibm_type, libcfs_nid2str(nid));
2281 goto failed;
2282 }
2283
2284 if (reqmsg->ibm_u.connparams.ibcp_queue_depth !=
2285 IBLND_MSG_QUEUE_SIZE(version)) {
2286 CERROR("Can't accept %s: incompatible queue depth %d (%d wanted)\n",
2287 libcfs_nid2str(nid), reqmsg->ibm_u.connparams.ibcp_queue_depth,
2288 IBLND_MSG_QUEUE_SIZE(version));
2289
2290 if (version == IBLND_MSG_VERSION)
2291 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2292
2293 goto failed;
2294 }
2295
2296 if (reqmsg->ibm_u.connparams.ibcp_max_frags !=
2297 IBLND_RDMA_FRAGS(version)) {
2298 CERROR("Can't accept %s(version %x): "
2299 "incompatible max_frags %d (%d wanted)\n",
2300 libcfs_nid2str(nid), version,
2301 reqmsg->ibm_u.connparams.ibcp_max_frags,
2302 IBLND_RDMA_FRAGS(version));
2303
2304 if (version == IBLND_MSG_VERSION)
2305 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2306
2307 goto failed;
2308
2309 }
2310
2311 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2312 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2313 libcfs_nid2str(nid),
2314 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2315 IBLND_MSG_SIZE);
2316 goto failed;
2317 }
2318
2319 /* assume 'nid' is a new peer; create */
2320 rc = kiblnd_create_peer(ni, &peer, nid);
2321 if (rc != 0) {
2322 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2323 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2324 goto failed;
2325 }
2326
2327 write_lock_irqsave(g_lock, flags);
2328
2329 peer2 = kiblnd_find_peer_locked(nid);
2330 if (peer2 != NULL) {
2331 if (peer2->ibp_version == 0) {
2332 peer2->ibp_version = version;
2333 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2334 }
2335
2336 /* not the guy I've talked with */
2337 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2338 peer2->ibp_version != version) {
2339 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2340 write_unlock_irqrestore(g_lock, flags);
2341
2342 CWARN("Conn stale %s [old ver: %x, new ver: %x]\n",
2343 libcfs_nid2str(nid), peer2->ibp_version, version);
2344
2345 kiblnd_peer_decref(peer);
2346 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2347 goto failed;
2348 }
2349
2350 /* tie-break connection race in favour of the higher NID */
2351 if (peer2->ibp_connecting != 0 &&
2352 nid < ni->ni_nid) {
2353 write_unlock_irqrestore(g_lock, flags);
2354
2355 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2356
2357 kiblnd_peer_decref(peer);
2358 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2359 goto failed;
2360 }
2361
2362 peer2->ibp_accepting++;
2363 kiblnd_peer_addref(peer2);
2364
2365 write_unlock_irqrestore(g_lock, flags);
2366 kiblnd_peer_decref(peer);
2367 peer = peer2;
2368 } else {
2369 /* Brand new peer */
2370 LASSERT (peer->ibp_accepting == 0);
2371 LASSERT (peer->ibp_version == 0 &&
2372 peer->ibp_incarnation == 0);
2373
2374 peer->ibp_accepting = 1;
2375 peer->ibp_version = version;
2376 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2377
2378 /* I have a ref on ni that prevents it being shutdown */
2379 LASSERT (net->ibn_shutdown == 0);
2380
2381 kiblnd_peer_addref(peer);
2382 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2383
2384 write_unlock_irqrestore(g_lock, flags);
2385 }
2386
2387 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2388 if (conn == NULL) {
2389 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2390 kiblnd_peer_decref(peer);
2391 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2392 goto failed;
2393 }
2394
2395 /* conn now "owns" cmid, so I return success from here on to ensure the
2396 * CM callback doesn't destroy cmid. */
2397
2398 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2399 conn->ibc_credits = IBLND_MSG_QUEUE_SIZE(version);
2400 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(version);
2401 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(version)
2402 <= IBLND_RX_MSGS(version));
2403
2404 ackmsg = &conn->ibc_connvars->cv_msg;
2405 memset(ackmsg, 0, sizeof(*ackmsg));
2406
2407 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2408 sizeof(ackmsg->ibm_u.connparams));
2409 ackmsg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2410 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2411 ackmsg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2412
2413 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2414
2415 memset(&cp, 0, sizeof(cp));
2416 cp.private_data = ackmsg;
2417 cp.private_data_len = ackmsg->ibm_nob;
2418 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2419 cp.initiator_depth = 0;
2420 cp.flow_control = 1;
2421 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2422 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2423
2424 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2425
2426 rc = rdma_accept(cmid, &cp);
2427 if (rc != 0) {
2428 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2429 rej.ibr_version = version;
2430 rej.ibr_why = IBLND_REJECT_FATAL;
2431
2432 kiblnd_reject(cmid, &rej);
2433 kiblnd_connreq_done(conn, rc);
2434 kiblnd_conn_decref(conn);
2435 }
2436
2437 lnet_ni_decref(ni);
2438 return 0;
2439
2440 failed:
2441 if (ni != NULL)
2442 lnet_ni_decref(ni);
2443
2444 rej.ibr_version = version;
2445 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2446 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2447 kiblnd_reject(cmid, &rej);
2448
2449 return -ECONNREFUSED;
2450 }
2451
2452 void
2453 kiblnd_reconnect (kib_conn_t *conn, int version,
2454 __u64 incarnation, int why, kib_connparams_t *cp)
2455 {
2456 kib_peer_t *peer = conn->ibc_peer;
2457 char *reason;
2458 int retry = 0;
2459 unsigned long flags;
2460
2461 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2462 LASSERT (peer->ibp_connecting > 0); /* 'conn' at least */
2463
2464 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2465
2466 /* retry connection if it's still needed and no other connection
2467 * attempts (active or passive) are in progress
2468 * NB: reconnect is still needed even when ibp_tx_queue is
2469 * empty if ibp_version != version because reconnect may be
2470 * initiated by kiblnd_query() */
2471 if ((!list_empty(&peer->ibp_tx_queue) ||
2472 peer->ibp_version != version) &&
2473 peer->ibp_connecting == 1 &&
2474 peer->ibp_accepting == 0) {
2475 retry = 1;
2476 peer->ibp_connecting++;
2477
2478 peer->ibp_version = version;
2479 peer->ibp_incarnation = incarnation;
2480 }
2481
2482 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2483
2484 if (!retry)
2485 return;
2486
2487 switch (why) {
2488 default:
2489 reason = "Unknown";
2490 break;
2491
2492 case IBLND_REJECT_CONN_STALE:
2493 reason = "stale";
2494 break;
2495
2496 case IBLND_REJECT_CONN_RACE:
2497 reason = "conn race";
2498 break;
2499
2500 case IBLND_REJECT_CONN_UNCOMPAT:
2501 reason = "version negotiation";
2502 break;
2503 }
2504
2505 CNETERR("%s: retrying (%s), %x, %x, "
2506 "queue_dep: %d, max_frag: %d, msg_size: %d\n",
2507 libcfs_nid2str(peer->ibp_nid),
2508 reason, IBLND_MSG_VERSION, version,
2509 cp != NULL? cp->ibcp_queue_depth :IBLND_MSG_QUEUE_SIZE(version),
2510 cp != NULL? cp->ibcp_max_frags : IBLND_RDMA_FRAGS(version),
2511 cp != NULL? cp->ibcp_max_msg_size: IBLND_MSG_SIZE);
2512
2513 kiblnd_connect_peer(peer);
2514 }
2515
2516 void
2517 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2518 {
2519 kib_peer_t *peer = conn->ibc_peer;
2520
2521 LASSERT (!in_interrupt());
2522 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2523
2524 switch (reason) {
2525 case IB_CM_REJ_STALE_CONN:
2526 kiblnd_reconnect(conn, IBLND_MSG_VERSION, 0,
2527 IBLND_REJECT_CONN_STALE, NULL);
2528 break;
2529
2530 case IB_CM_REJ_INVALID_SERVICE_ID:
2531 CNETERR("%s rejected: no listener at %d\n",
2532 libcfs_nid2str(peer->ibp_nid),
2533 *kiblnd_tunables.kib_service);
2534 break;
2535
2536 case IB_CM_REJ_CONSUMER_DEFINED:
2537 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2538 kib_rej_t *rej = priv;
2539 kib_connparams_t *cp = NULL;
2540 int flip = 0;
2541 __u64 incarnation = -1;
2542
2543 /* NB. default incarnation is -1 because:
2544 * a) V1 will ignore dst incarnation in connreq.
2545 * b) V2 will provide incarnation while rejecting me,
2546 * -1 will be overwrote.
2547 *
2548 * if I try to connect to a V1 peer with V2 protocol,
2549 * it rejected me then upgrade to V2, I have no idea
2550 * about the upgrading and try to reconnect with V1,
2551 * in this case upgraded V2 can find out I'm trying to
2552 * talk to the old guy and reject me(incarnation is -1).
2553 */
2554
2555 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2556 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2557 __swab32s(&rej->ibr_magic);
2558 __swab16s(&rej->ibr_version);
2559 flip = 1;
2560 }
2561
2562 if (priv_nob >= sizeof(kib_rej_t) &&
2563 rej->ibr_version > IBLND_MSG_VERSION_1) {
2564 /* priv_nob is always 148 in current version
2565 * of OFED, so we still need to check version.
2566 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2567 cp = &rej->ibr_cp;
2568
2569 if (flip) {
2570 __swab64s(&rej->ibr_incarnation);
2571 __swab16s(&cp->ibcp_queue_depth);
2572 __swab16s(&cp->ibcp_max_frags);
2573 __swab32s(&cp->ibcp_max_msg_size);
2574 }
2575
2576 incarnation = rej->ibr_incarnation;
2577 }
2578
2579 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2580 rej->ibr_magic != LNET_PROTO_MAGIC) {
2581 CERROR("%s rejected: consumer defined fatal error\n",
2582 libcfs_nid2str(peer->ibp_nid));
2583 break;
2584 }
2585
2586 if (rej->ibr_version != IBLND_MSG_VERSION &&
2587 rej->ibr_version != IBLND_MSG_VERSION_1) {
2588 CERROR("%s rejected: o2iblnd version %x error\n",
2589 libcfs_nid2str(peer->ibp_nid),
2590 rej->ibr_version);
2591 break;
2592 }
2593
2594 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2595 rej->ibr_version == IBLND_MSG_VERSION_1) {
2596 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2597 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2598
2599 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2600 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2601 }
2602
2603 switch (rej->ibr_why) {
2604 case IBLND_REJECT_CONN_RACE:
2605 case IBLND_REJECT_CONN_STALE:
2606 case IBLND_REJECT_CONN_UNCOMPAT:
2607 kiblnd_reconnect(conn, rej->ibr_version,
2608 incarnation, rej->ibr_why, cp);
2609 break;
2610
2611 case IBLND_REJECT_MSG_QUEUE_SIZE:
2612 CERROR("%s rejected: incompatible message queue depth %d, %d\n",
2613 libcfs_nid2str(peer->ibp_nid), cp->ibcp_queue_depth,
2614 IBLND_MSG_QUEUE_SIZE(conn->ibc_version));
2615 break;
2616
2617 case IBLND_REJECT_RDMA_FRAGS:
2618 CERROR("%s rejected: incompatible # of RDMA fragments %d, %d\n",
2619 libcfs_nid2str(peer->ibp_nid), cp->ibcp_max_frags,
2620 IBLND_RDMA_FRAGS(conn->ibc_version));
2621 break;
2622
2623 case IBLND_REJECT_NO_RESOURCES:
2624 CERROR("%s rejected: o2iblnd no resources\n",
2625 libcfs_nid2str(peer->ibp_nid));
2626 break;
2627
2628 case IBLND_REJECT_FATAL:
2629 CERROR("%s rejected: o2iblnd fatal error\n",
2630 libcfs_nid2str(peer->ibp_nid));
2631 break;
2632
2633 default:
2634 CERROR("%s rejected: o2iblnd reason %d\n",
2635 libcfs_nid2str(peer->ibp_nid),
2636 rej->ibr_why);
2637 break;
2638 }
2639 break;
2640 }
2641 /* fall through */
2642 default:
2643 CNETERR("%s rejected: reason %d, size %d\n",
2644 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2645 break;
2646 }
2647
2648 kiblnd_connreq_done(conn, -ECONNREFUSED);
2649 }
2650
2651 void
2652 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2653 {
2654 kib_peer_t *peer = conn->ibc_peer;
2655 lnet_ni_t *ni = peer->ibp_ni;
2656 kib_net_t *net = ni->ni_data;
2657 kib_msg_t *msg = priv;
2658 int ver = conn->ibc_version;
2659 int rc = kiblnd_unpack_msg(msg, priv_nob);
2660 unsigned long flags;
2661
2662 LASSERT (net != NULL);
2663
2664 if (rc != 0) {
2665 CERROR("Can't unpack connack from %s: %d\n",
2666 libcfs_nid2str(peer->ibp_nid), rc);
2667 goto failed;
2668 }
2669
2670 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2671 CERROR("Unexpected message %d from %s\n",
2672 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2673 rc = -EPROTO;
2674 goto failed;
2675 }
2676
2677 if (ver != msg->ibm_version) {
2678 CERROR("%s replied version %x is different with "
2679 "requested version %x\n",
2680 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2681 rc = -EPROTO;
2682 goto failed;
2683 }
2684
2685 if (msg->ibm_u.connparams.ibcp_queue_depth !=
2686 IBLND_MSG_QUEUE_SIZE(ver)) {
2687 CERROR("%s has incompatible queue depth %d(%d wanted)\n",
2688 libcfs_nid2str(peer->ibp_nid),
2689 msg->ibm_u.connparams.ibcp_queue_depth,
2690 IBLND_MSG_QUEUE_SIZE(ver));
2691 rc = -EPROTO;
2692 goto failed;
2693 }
2694
2695 if (msg->ibm_u.connparams.ibcp_max_frags !=
2696 IBLND_RDMA_FRAGS(ver)) {
2697 CERROR("%s has incompatible max_frags %d (%d wanted)\n",
2698 libcfs_nid2str(peer->ibp_nid),
2699 msg->ibm_u.connparams.ibcp_max_frags,
2700 IBLND_RDMA_FRAGS(ver));
2701 rc = -EPROTO;
2702 goto failed;
2703 }
2704
2705 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2706 CERROR("%s max message size %d too big (%d max)\n",
2707 libcfs_nid2str(peer->ibp_nid),
2708 msg->ibm_u.connparams.ibcp_max_msg_size,
2709 IBLND_MSG_SIZE);
2710 rc = -EPROTO;
2711 goto failed;
2712 }
2713
2714 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2715 if (msg->ibm_dstnid == ni->ni_nid &&
2716 msg->ibm_dststamp == net->ibn_incarnation)
2717 rc = 0;
2718 else
2719 rc = -ESTALE;
2720 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2721
2722 if (rc != 0) {
2723 CERROR("Bad connection reply from %s, rc = %d, "
2724 "version: %x max_frags: %d\n",
2725 libcfs_nid2str(peer->ibp_nid), rc,
2726 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2727 goto failed;
2728 }
2729
2730 conn->ibc_incarnation = msg->ibm_srcstamp;
2731 conn->ibc_credits =
2732 conn->ibc_reserved_credits = IBLND_MSG_QUEUE_SIZE(ver);
2733 LASSERT (conn->ibc_credits + conn->ibc_reserved_credits + IBLND_OOB_MSGS(ver)
2734 <= IBLND_RX_MSGS(ver));
2735
2736 kiblnd_connreq_done(conn, 0);
2737 return;
2738
2739 failed:
2740 /* NB My QP has already established itself, so I handle anything going
2741 * wrong here by setting ibc_comms_error.
2742 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2743 * immediately tears it down. */
2744
2745 LASSERT (rc != 0);
2746 conn->ibc_comms_error = rc;
2747 kiblnd_connreq_done(conn, 0);
2748 }
2749
2750 int
2751 kiblnd_active_connect (struct rdma_cm_id *cmid)
2752 {
2753 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2754 kib_conn_t *conn;
2755 kib_msg_t *msg;
2756 struct rdma_conn_param cp;
2757 int version;
2758 __u64 incarnation;
2759 unsigned long flags;
2760 int rc;
2761
2762 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2763
2764 incarnation = peer->ibp_incarnation;
2765 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2766 peer->ibp_version;
2767
2768 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2769
2770 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT, version);
2771 if (conn == NULL) {
2772 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2773 kiblnd_peer_decref(peer); /* lose cmid's ref */
2774 return -ENOMEM;
2775 }
2776
2777 /* conn "owns" cmid now, so I return success from here on to ensure the
2778 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2779 * on peer */
2780
2781 msg = &conn->ibc_connvars->cv_msg;
2782
2783 memset(msg, 0, sizeof(*msg));
2784 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2785 msg->ibm_u.connparams.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2786 msg->ibm_u.connparams.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2787 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2788
2789 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2790 0, peer->ibp_nid, incarnation);
2791
2792 memset(&cp, 0, sizeof(cp));
2793 cp.private_data = msg;
2794 cp.private_data_len = msg->ibm_nob;
2795 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2796 cp.initiator_depth = 0;
2797 cp.flow_control = 1;
2798 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2799 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2800
2801 LASSERT(cmid->context == (void *)conn);
2802 LASSERT(conn->ibc_cmid == cmid);
2803
2804 rc = rdma_connect(cmid, &cp);
2805 if (rc != 0) {
2806 CERROR("Can't connect to %s: %d\n",
2807 libcfs_nid2str(peer->ibp_nid), rc);
2808 kiblnd_connreq_done(conn, rc);
2809 kiblnd_conn_decref(conn);
2810 }
2811
2812 return 0;
2813 }
2814
2815 int
2816 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2817 {
2818 kib_peer_t *peer;
2819 kib_conn_t *conn;
2820 int rc;
2821
2822 switch (event->event) {
2823 default:
2824 CERROR("Unexpected event: %d, status: %d\n",
2825 event->event, event->status);
2826 LBUG();
2827
2828 case RDMA_CM_EVENT_CONNECT_REQUEST:
2829 /* destroy cmid on failure */
2830 rc = kiblnd_passive_connect(cmid,
2831 (void *)KIBLND_CONN_PARAM(event),
2832 KIBLND_CONN_PARAM_LEN(event));
2833 CDEBUG(D_NET, "connreq: %d\n", rc);
2834 return rc;
2835
2836 case RDMA_CM_EVENT_ADDR_ERROR:
2837 peer = (kib_peer_t *)cmid->context;
2838 CNETERR("%s: ADDR ERROR %d\n",
2839 libcfs_nid2str(peer->ibp_nid), event->status);
2840 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2841 kiblnd_peer_decref(peer);
2842 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2843
2844 case RDMA_CM_EVENT_ADDR_RESOLVED:
2845 peer = (kib_peer_t *)cmid->context;
2846
2847 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2848 libcfs_nid2str(peer->ibp_nid), event->status);
2849
2850 if (event->status != 0) {
2851 CNETERR("Can't resolve address for %s: %d\n",
2852 libcfs_nid2str(peer->ibp_nid), event->status);
2853 rc = event->status;
2854 } else {
2855 rc = rdma_resolve_route(
2856 cmid, *kiblnd_tunables.kib_timeout * 1000);
2857 if (rc == 0)
2858 return 0;
2859 /* Can't initiate route resolution */
2860 CERROR("Can't resolve route for %s: %d\n",
2861 libcfs_nid2str(peer->ibp_nid), rc);
2862 }
2863 kiblnd_peer_connect_failed(peer, 1, rc);
2864 kiblnd_peer_decref(peer);
2865 return rc; /* rc != 0 destroys cmid */
2866
2867 case RDMA_CM_EVENT_ROUTE_ERROR:
2868 peer = (kib_peer_t *)cmid->context;
2869 CNETERR("%s: ROUTE ERROR %d\n",
2870 libcfs_nid2str(peer->ibp_nid), event->status);
2871 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2872 kiblnd_peer_decref(peer);
2873 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2874
2875 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2876 peer = (kib_peer_t *)cmid->context;
2877 CDEBUG(D_NET,"%s Route resolved: %d\n",
2878 libcfs_nid2str(peer->ibp_nid), event->status);
2879
2880 if (event->status == 0)
2881 return kiblnd_active_connect(cmid);
2882
2883 CNETERR("Can't resolve route for %s: %d\n",
2884 libcfs_nid2str(peer->ibp_nid), event->status);
2885 kiblnd_peer_connect_failed(peer, 1, event->status);
2886 kiblnd_peer_decref(peer);
2887 return event->status; /* rc != 0 destroys cmid */
2888
2889 case RDMA_CM_EVENT_UNREACHABLE:
2890 conn = (kib_conn_t *)cmid->context;
2891 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2892 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2893 CNETERR("%s: UNREACHABLE %d\n",
2894 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2895 kiblnd_connreq_done(conn, -ENETDOWN);
2896 kiblnd_conn_decref(conn);
2897 return 0;
2898
2899 case RDMA_CM_EVENT_CONNECT_ERROR:
2900 conn = (kib_conn_t *)cmid->context;
2901 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
2902 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
2903 CNETERR("%s: CONNECT ERROR %d\n",
2904 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
2905 kiblnd_connreq_done(conn, -ENOTCONN);
2906 kiblnd_conn_decref(conn);
2907 return 0;
2908
2909 case RDMA_CM_EVENT_REJECTED:
2910 conn = (kib_conn_t *)cmid->context;
2911 switch (conn->ibc_state) {
2912 default:
2913 LBUG();
2914
2915 case IBLND_CONN_PASSIVE_WAIT:
2916 CERROR ("%s: REJECTED %d\n",
2917 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2918 event->status);
2919 kiblnd_connreq_done(conn, -ECONNRESET);
2920 break;
2921
2922 case IBLND_CONN_ACTIVE_CONNECT:
2923 kiblnd_rejected(conn, event->status,
2924 (void *)KIBLND_CONN_PARAM(event),
2925 KIBLND_CONN_PARAM_LEN(event));
2926 break;
2927 }
2928 kiblnd_conn_decref(conn);
2929 return 0;
2930
2931 case RDMA_CM_EVENT_ESTABLISHED:
2932 conn = (kib_conn_t *)cmid->context;
2933 switch (conn->ibc_state) {
2934 default:
2935 LBUG();
2936
2937 case IBLND_CONN_PASSIVE_WAIT:
2938 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
2939 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2940 kiblnd_connreq_done(conn, 0);
2941 break;
2942
2943 case IBLND_CONN_ACTIVE_CONNECT:
2944 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
2945 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2946 kiblnd_check_connreply(conn,
2947 (void *)KIBLND_CONN_PARAM(event),
2948 KIBLND_CONN_PARAM_LEN(event));
2949 break;
2950 }
2951 /* net keeps its ref on conn! */
2952 return 0;
2953
2954 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2955 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
2956 return 0;
2957 case RDMA_CM_EVENT_DISCONNECTED:
2958 conn = (kib_conn_t *)cmid->context;
2959 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
2960 CERROR("%s DISCONNECTED\n",
2961 libcfs_nid2str(conn->ibc_peer->ibp_nid));
2962 kiblnd_connreq_done(conn, -ECONNRESET);
2963 } else {
2964 kiblnd_close_conn(conn, 0);
2965 }
2966 kiblnd_conn_decref(conn);
2967 cmid->context = NULL;
2968 return 0;
2969
2970 case RDMA_CM_EVENT_DEVICE_REMOVAL:
2971 LCONSOLE_ERROR_MSG(0x131,
2972 "Received notification of device removal\n"
2973 "Please shutdown LNET to allow this to proceed\n");
2974 /* Can't remove network from underneath LNET for now, so I have
2975 * to ignore this */
2976 return 0;
2977
2978 case RDMA_CM_EVENT_ADDR_CHANGE:
2979 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
2980 return 0;
2981 }
2982 }
2983
2984 static int
2985 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
2986 {
2987 kib_tx_t *tx;
2988 struct list_head *ttmp;
2989
2990 list_for_each (ttmp, txs) {
2991 tx = list_entry (ttmp, kib_tx_t, tx_list);
2992
2993 if (txs != &conn->ibc_active_txs) {
2994 LASSERT (tx->tx_queued);
2995 } else {
2996 LASSERT (!tx->tx_queued);
2997 LASSERT (tx->tx_waiting || tx->tx_sending != 0);
2998 }
2999
3000 if (cfs_time_aftereq (jiffies, tx->tx_deadline)) {
3001 CERROR("Timed out tx: %s, %lu seconds\n",
3002 kiblnd_queue2str(conn, txs),
3003 cfs_duration_sec(jiffies - tx->tx_deadline));
3004 return 1;
3005 }
3006 }
3007
3008 return 0;
3009 }
3010
3011 static int
3012 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3013 {
3014 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3015 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3016 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3017 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3018 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3019 }
3020
3021 void
3022 kiblnd_check_conns (int idx)
3023 {
3024 LIST_HEAD (closes);
3025 LIST_HEAD (checksends);
3026 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3027 struct list_head *ptmp;
3028 kib_peer_t *peer;
3029 kib_conn_t *conn;
3030 struct list_head *ctmp;
3031 unsigned long flags;
3032
3033 /* NB. We expect to have a look at all the peers and not find any
3034 * RDMAs to time out, so we just use a shared lock while we
3035 * take a look... */
3036 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3037
3038 list_for_each (ptmp, peers) {
3039 peer = list_entry (ptmp, kib_peer_t, ibp_list);
3040
3041 list_for_each (ctmp, &peer->ibp_conns) {
3042 int timedout;
3043 int sendnoop;
3044
3045 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3046
3047 LASSERT (conn->ibc_state == IBLND_CONN_ESTABLISHED);
3048
3049 spin_lock(&conn->ibc_lock);
3050
3051 sendnoop = kiblnd_need_noop(conn);
3052 timedout = kiblnd_conn_timed_out_locked(conn);
3053 if (!sendnoop && !timedout) {
3054 spin_unlock(&conn->ibc_lock);
3055 continue;
3056 }
3057
3058 if (timedout) {
3059 CERROR("Timed out RDMA with %s (%lu): "
3060 "c: %u, oc: %u, rc: %u\n",
3061 libcfs_nid2str(peer->ibp_nid),
3062 cfs_duration_sec(cfs_time_current() -
3063 peer->ibp_last_alive),
3064 conn->ibc_credits,
3065 conn->ibc_outstanding_credits,
3066 conn->ibc_reserved_credits);
3067 list_add(&conn->ibc_connd_list, &closes);
3068 } else {
3069 list_add(&conn->ibc_connd_list,
3070 &checksends);
3071 }
3072 /* +ref for 'closes' or 'checksends' */
3073 kiblnd_conn_addref(conn);
3074
3075 spin_unlock(&conn->ibc_lock);
3076 }
3077 }
3078
3079 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3080
3081 /* Handle timeout by closing the whole
3082 * connection. We can only be sure RDMA activity
3083 * has ceased once the QP has been modified. */
3084 while (!list_empty(&closes)) {
3085 conn = list_entry(closes.next,
3086 kib_conn_t, ibc_connd_list);
3087 list_del(&conn->ibc_connd_list);
3088 kiblnd_close_conn(conn, -ETIMEDOUT);
3089 kiblnd_conn_decref(conn);
3090 }
3091
3092 /* In case we have enough credits to return via a
3093 * NOOP, but there were no non-blocking tx descs
3094 * free to do it last time... */
3095 while (!list_empty(&checksends)) {
3096 conn = list_entry(checksends.next,
3097 kib_conn_t, ibc_connd_list);
3098 list_del(&conn->ibc_connd_list);
3099 kiblnd_check_sends(conn);
3100 kiblnd_conn_decref(conn);
3101 }
3102 }
3103
3104 void
3105 kiblnd_disconnect_conn (kib_conn_t *conn)
3106 {
3107 LASSERT (!in_interrupt());
3108 LASSERT (current == kiblnd_data.kib_connd);
3109 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3110
3111 rdma_disconnect(conn->ibc_cmid);
3112 kiblnd_finalise_conn(conn);
3113
3114 kiblnd_peer_notify(conn->ibc_peer);
3115 }
3116
3117 int
3118 kiblnd_connd (void *arg)
3119 {
3120 wait_queue_t wait;
3121 unsigned long flags;
3122 kib_conn_t *conn;
3123 int timeout;
3124 int i;
3125 int dropped_lock;
3126 int peer_index = 0;
3127 unsigned long deadline = jiffies;
3128
3129 cfs_block_allsigs ();
3130
3131 init_waitqueue_entry_current (&wait);
3132 kiblnd_data.kib_connd = current;
3133
3134 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3135
3136 while (!kiblnd_data.kib_shutdown) {
3137
3138 dropped_lock = 0;
3139
3140 if (!list_empty (&kiblnd_data.kib_connd_zombies)) {
3141 conn = list_entry(kiblnd_data. \
3142 kib_connd_zombies.next,
3143 kib_conn_t, ibc_list);
3144 list_del(&conn->ibc_list);
3145
3146 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3147 flags);
3148 dropped_lock = 1;
3149
3150 kiblnd_destroy_conn(conn);
3151
3152 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3153 }
3154
3155 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3156 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3157 kib_conn_t, ibc_list);
3158 list_del(&conn->ibc_list);
3159
3160 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock,
3161 flags);
3162 dropped_lock = 1;
3163
3164 kiblnd_disconnect_conn(conn);
3165 kiblnd_conn_decref(conn);
3166
3167 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3168 }
3169
3170 /* careful with the jiffy wrap... */
3171 timeout = (int)(deadline - jiffies);
3172 if (timeout <= 0) {
3173 const int n = 4;
3174 const int p = 1;
3175 int chunk = kiblnd_data.kib_peer_hash_size;
3176
3177 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3178 dropped_lock = 1;
3179
3180 /* Time to check for RDMA timeouts on a few more
3181 * peers: I do checks every 'p' seconds on a
3182 * proportion of the peer table and I need to check
3183 * every connection 'n' times within a timeout
3184 * interval, to ensure I detect a timeout on any
3185 * connection within (n+1)/n times the timeout
3186 * interval. */
3187
3188 if (*kiblnd_tunables.kib_timeout > n * p)
3189 chunk = (chunk * n * p) /
3190 *kiblnd_tunables.kib_timeout;
3191 if (chunk == 0)
3192 chunk = 1;
3193
3194 for (i = 0; i < chunk; i++) {
3195 kiblnd_check_conns(peer_index);
3196 peer_index = (peer_index + 1) %
3197 kiblnd_data.kib_peer_hash_size;
3198 }
3199
3200 deadline += p * HZ;
3201 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3202 }
3203
3204 if (dropped_lock)
3205 continue;
3206
3207 /* Nothing to do for 'timeout' */
3208 set_current_state(TASK_INTERRUPTIBLE);
3209 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3210 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3211
3212 waitq_timedwait(&wait, TASK_INTERRUPTIBLE, timeout);
3213
3214 set_current_state(TASK_RUNNING);
3215 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3216 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
3217 }
3218
3219 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
3220
3221 kiblnd_thread_fini();
3222 return 0;
3223 }
3224
3225 void
3226 kiblnd_qp_event(struct ib_event *event, void *arg)
3227 {
3228 kib_conn_t *conn = arg;
3229
3230 switch (event->event) {
3231 case IB_EVENT_COMM_EST:
3232 CDEBUG(D_NET, "%s established\n",
3233 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3234 return;
3235
3236 default:
3237 CERROR("%s: Async QP event type %d\n",
3238 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3239 return;
3240 }
3241 }
3242
3243 void
3244 kiblnd_complete (struct ib_wc *wc)
3245 {
3246 switch (kiblnd_wreqid2type(wc->wr_id)) {
3247 default:
3248 LBUG();
3249
3250 case IBLND_WID_RDMA:
3251 /* We only get RDMA completion notification if it fails. All
3252 * subsequent work items, including the final SEND will fail
3253 * too. However we can't print out any more info about the
3254 * failing RDMA because 'tx' might be back on the idle list or
3255 * even reused already if we didn't manage to post all our work
3256 * items */
3257 CNETERR("RDMA (tx: %p) failed: %d\n",
3258 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3259 return;
3260
3261 case IBLND_WID_TX:
3262 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3263 return;
3264
3265 case IBLND_WID_RX:
3266 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3267 wc->byte_len);
3268 return;
3269 }
3270 }
3271
3272 void
3273 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3274 {
3275 /* NB I'm not allowed to schedule this conn once its refcount has
3276 * reached 0. Since fundamentally I'm racing with scheduler threads
3277 * consuming my CQ I could be called after all completions have
3278 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3279 * and this CQ is about to be destroyed so I NOOP. */
3280 kib_conn_t *conn = (kib_conn_t *)arg;
3281 struct kib_sched_info *sched = conn->ibc_sched;
3282 unsigned long flags;
3283
3284 LASSERT(cq == conn->ibc_cq);
3285
3286 spin_lock_irqsave(&sched->ibs_lock, flags);
3287
3288 conn->ibc_ready = 1;
3289
3290 if (!conn->ibc_scheduled &&
3291 (conn->ibc_nrx > 0 ||
3292 conn->ibc_nsends_posted > 0)) {
3293 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3294 conn->ibc_scheduled = 1;
3295 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3296
3297 if (waitqueue_active(&sched->ibs_waitq))
3298 wake_up(&sched->ibs_waitq);
3299 }
3300
3301 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3302 }
3303
3304 void
3305 kiblnd_cq_event(struct ib_event *event, void *arg)
3306 {
3307 kib_conn_t *conn = arg;
3308
3309 CERROR("%s: async CQ event type %d\n",
3310 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3311 }
3312
3313 int
3314 kiblnd_scheduler(void *arg)
3315 {
3316 long id = (long)arg;
3317 struct kib_sched_info *sched;
3318 kib_conn_t *conn;
3319 wait_queue_t wait;
3320 unsigned long flags;
3321 struct ib_wc wc;
3322 int did_something;
3323 int busy_loops = 0;
3324 int rc;
3325
3326 cfs_block_allsigs();
3327
3328 init_waitqueue_entry_current(&wait);
3329
3330 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3331
3332 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3333 if (rc != 0) {
3334 CWARN("Failed to bind on CPT %d, please verify whether "
3335 "all CPUs are healthy and reload modules if necessary, "
3336 "otherwise your system might under risk of low "
3337 "performance\n", sched->ibs_cpt);
3338 }
3339
3340 spin_lock_irqsave(&sched->ibs_lock, flags);
3341
3342 while (!kiblnd_data.kib_shutdown) {
3343 if (busy_loops++ >= IBLND_RESCHED) {
3344 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3345
3346 cond_resched();
3347 busy_loops = 0;
3348
3349 spin_lock_irqsave(&sched->ibs_lock, flags);
3350 }
3351
3352 did_something = 0;
3353
3354 if (!list_empty(&sched->ibs_conns)) {
3355 conn = list_entry(sched->ibs_conns.next,
3356 kib_conn_t, ibc_sched_list);
3357 /* take over kib_sched_conns' ref on conn... */
3358 LASSERT(conn->ibc_scheduled);
3359 list_del(&conn->ibc_sched_list);
3360 conn->ibc_ready = 0;
3361
3362 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3363
3364 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3365 if (rc == 0) {
3366 rc = ib_req_notify_cq(conn->ibc_cq,
3367 IB_CQ_NEXT_COMP);
3368 if (rc < 0) {
3369 CWARN("%s: ib_req_notify_cq failed: %d, "
3370 "closing connection\n",
3371 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3372 kiblnd_close_conn(conn, -EIO);
3373 kiblnd_conn_decref(conn);
3374 spin_lock_irqsave(&sched->ibs_lock,
3375 flags);
3376 continue;
3377 }
3378
3379 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3380 }
3381
3382 if (rc < 0) {
3383 CWARN("%s: ib_poll_cq failed: %d, "
3384 "closing connection\n",
3385 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3386 rc);
3387 kiblnd_close_conn(conn, -EIO);
3388 kiblnd_conn_decref(conn);
3389 spin_lock_irqsave(&sched->ibs_lock, flags);
3390 continue;
3391 }
3392
3393 spin_lock_irqsave(&sched->ibs_lock, flags);
3394
3395 if (rc != 0 || conn->ibc_ready) {
3396 /* There may be another completion waiting; get
3397 * another scheduler to check while I handle
3398 * this one... */
3399 /* +1 ref for sched_conns */
3400 kiblnd_conn_addref(conn);
3401 list_add_tail(&conn->ibc_sched_list,
3402 &sched->ibs_conns);
3403 if (waitqueue_active(&sched->ibs_waitq))
3404 wake_up(&sched->ibs_waitq);
3405 } else {
3406 conn->ibc_scheduled = 0;
3407 }
3408
3409 if (rc != 0) {
3410 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3411 kiblnd_complete(&wc);
3412
3413 spin_lock_irqsave(&sched->ibs_lock, flags);
3414 }
3415
3416 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3417 did_something = 1;
3418 }
3419
3420 if (did_something)
3421 continue;
3422
3423 set_current_state(TASK_INTERRUPTIBLE);
3424 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3425 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3426
3427 waitq_wait(&wait, TASK_INTERRUPTIBLE);
3428 busy_loops = 0;
3429
3430 remove_wait_queue(&sched->ibs_waitq, &wait);
3431 set_current_state(TASK_RUNNING);
3432 spin_lock_irqsave(&sched->ibs_lock, flags);
3433 }
3434
3435 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3436
3437 kiblnd_thread_fini();
3438 return 0;
3439 }
3440
3441 int
3442 kiblnd_failover_thread(void *arg)
3443 {
3444 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3445 kib_dev_t *dev;
3446 wait_queue_t wait;
3447 unsigned long flags;
3448 int rc;
3449
3450 LASSERT (*kiblnd_tunables.kib_dev_failover != 0);
3451
3452 cfs_block_allsigs ();
3453
3454 init_waitqueue_entry_current(&wait);
3455 write_lock_irqsave(glock, flags);
3456
3457 while (!kiblnd_data.kib_shutdown) {
3458 int do_failover = 0;
3459 int long_sleep;
3460
3461 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3462 ibd_fail_list) {
3463 if (cfs_time_before(cfs_time_current(),
3464 dev->ibd_next_failover))
3465 continue;
3466 do_failover = 1;
3467 break;
3468 }
3469
3470 if (do_failover) {
3471 list_del_init(&dev->ibd_fail_list);
3472 dev->ibd_failover = 1;
3473 write_unlock_irqrestore(glock, flags);
3474
3475 rc = kiblnd_dev_failover(dev);
3476
3477 write_lock_irqsave(glock, flags);
3478
3479 LASSERT (dev->ibd_failover);
3480 dev->ibd_failover = 0;
3481 if (rc >= 0) { /* Device is OK or failover succeed */
3482 dev->ibd_next_failover = cfs_time_shift(3);
3483 continue;
3484 }
3485
3486 /* failed to failover, retry later */
3487 dev->ibd_next_failover =
3488 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3489 if (kiblnd_dev_can_failover(dev)) {
3490 list_add_tail(&dev->ibd_fail_list,
3491 &kiblnd_data.kib_failed_devs);
3492 }
3493
3494 continue;
3495 }
3496
3497 /* long sleep if no more pending failover */
3498 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3499
3500 set_current_state(TASK_INTERRUPTIBLE);
3501 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3502 write_unlock_irqrestore(glock, flags);
3503
3504 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3505 cfs_time_seconds(1));
3506 set_current_state(TASK_RUNNING);
3507 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3508 write_lock_irqsave(glock, flags);
3509
3510 if (!long_sleep || rc != 0)
3511 continue;
3512
3513 /* have a long sleep, routine check all active devices,
3514 * we need checking like this because if there is not active
3515 * connection on the dev and no SEND from local, we may listen
3516 * on wrong HCA for ever while there is a bonding failover */
3517 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3518 if (kiblnd_dev_can_failover(dev)) {
3519 list_add_tail(&dev->ibd_fail_list,
3520 &kiblnd_data.kib_failed_devs);
3521 }
3522 }
3523 }
3524
3525 write_unlock_irqrestore(glock, flags);
3526
3527 kiblnd_thread_fini();
3528 return 0;
3529 }
Linux kernel - Deliverables
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