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Merge remote-tracking branches 'regmap/topic/bulk', 'regmap/topic/i2c', 'regmap/topic...
[deliverable/linux.git] / drivers / staging / lustre / lnet / klnds / o2iblnd / o2iblnd_cb.c
CommitLineData
d7e09d03
PT		 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 *
1dc563a6 30 * Copyright (c) 2012, 2015, Intel Corporation.
d7e09d03
PT		 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
3667cded
FZ		 43static void kiblnd_peer_alive(kib_peer_t *peer);
44static void kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error);
45static void kiblnd_check_sends(kib_conn_t *conn);
46static void kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx,
47 int type, int body_nob);
48static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
49 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
50static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
51static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
2f3622b9
IH		 52static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
53
a8046a28 54static void
af967b29 55kiblnd_tx_done(lnet_ni_t *ni, kib_tx_t *tx)
d7e09d03
PT		 56{
57 lnet_msg_t *lntmsg[2];
ec3d17c0
MS		 58 kib_net_t *net = ni->ni_data;
59 int rc;
60 int i;
d7e09d03 61
06ace26e 62 LASSERT(net);
af967b29
GM		 63 LASSERT(!in_interrupt());
64 LASSERT(!tx->tx_queued); /* mustn't be queued for sending */
5fd88337 65 LASSERT(!tx->tx_sending); /* mustn't be awaiting sent callback */
af967b29 66 LASSERT(!tx->tx_waiting); /* mustn't be awaiting peer response */
06ace26e 67 LASSERT(tx->tx_pool);
d7e09d03
PT		 68
69 kiblnd_unmap_tx(ni, tx);
70
71 /* tx may have up to 2 lnet msgs to finalise */
72 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
73 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
74 rc = tx->tx_status;
75
06ace26e 76 if (tx->tx_conn) {
af967b29 77 LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
d7e09d03
PT		 78
79 kiblnd_conn_decref(tx->tx_conn);
80 tx->tx_conn = NULL;
81 }
82
83 tx->tx_nwrq = 0;
84 tx->tx_status = 0;
85
86 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
87
88 /* delay finalize until my descs have been freed */
89 for (i = 0; i < 2; i++) {
06ace26e 90 if (!lntmsg[i])
d7e09d03
PT		 91 continue;
92
93 lnet_finalize(ni, lntmsg[i], rc);
94 }
95}
96
97void
af967b29 98kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
d7e09d03
PT		 99{
100 kib_tx_t *tx;
101
6fe7f962 102 while (!list_empty(txlist)) {
af967b29 103 tx = list_entry(txlist->next, kib_tx_t, tx_list);
d7e09d03
PT		 104
105 list_del(&tx->tx_list);
106 /* complete now */
107 tx->tx_waiting = 0;
108 tx->tx_status = status;
109 kiblnd_tx_done(ni, tx);
110 }
111}
112
a8046a28 113static kib_tx_t *
d7e09d03
PT		 114kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
115{
ec3d17c0
MS		 116 kib_net_t *net = (kib_net_t *)ni->ni_data;
117 struct list_head *node;
118 kib_tx_t *tx;
119 kib_tx_poolset_t *tps;
d7e09d03
PT		 120
121 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
122 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
06ace26e 123 if (!node)
d7e09d03 124 return NULL;
31cf532a 125 tx = list_entry(node, kib_tx_t, tx_list);
d7e09d03 126
5fd88337 127 LASSERT(!tx->tx_nwrq);
af967b29 128 LASSERT(!tx->tx_queued);
5fd88337 129 LASSERT(!tx->tx_sending);
af967b29 130 LASSERT(!tx->tx_waiting);
5fd88337 131 LASSERT(!tx->tx_status);
06ace26e
JS		 132 LASSERT(!tx->tx_conn);
133 LASSERT(!tx->tx_lntmsg[0]);
134 LASSERT(!tx->tx_lntmsg[1]);
5fd88337 135 LASSERT(!tx->tx_nfrags);
d7e09d03
PT		 136
137 return tx;
138}
139
a8046a28 140static void
d7e09d03
PT		 141kiblnd_drop_rx(kib_rx_t *rx)
142{
ec3d17c0
MS		 143 kib_conn_t *conn = rx->rx_conn;
144 struct kib_sched_info *sched = conn->ibc_sched;
145 unsigned long flags;
d7e09d03
PT		 146
147 spin_lock_irqsave(&sched->ibs_lock, flags);
148 LASSERT(conn->ibc_nrx > 0);
149 conn->ibc_nrx--;
150 spin_unlock_irqrestore(&sched->ibs_lock, flags);
151
152 kiblnd_conn_decref(conn);
153}
154
155int
af967b29 156kiblnd_post_rx(kib_rx_t *rx, int credit)
d7e09d03 157{
ec3d17c0
MS		 158 kib_conn_t *conn = rx->rx_conn;
159 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
160 struct ib_recv_wr *bad_wrq = NULL;
7cadcc7c 161 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
ec3d17c0 162 int rc;
d7e09d03 163
06ace26e 164 LASSERT(net);
af967b29
GM		 165 LASSERT(!in_interrupt());
166 LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
167 credit == IBLND_POSTRX_PEER_CREDIT ||
168 credit == IBLND_POSTRX_RSRVD_CREDIT);
06ace26e 169 LASSERT(mr);
d7e09d03
PT		 170
171 rx->rx_sge.lkey = mr->lkey;
172 rx->rx_sge.addr = rx->rx_msgaddr;
173 rx->rx_sge.length = IBLND_MSG_SIZE;
174
ec3d17c0 175 rx->rx_wrq.next = NULL;
d7e09d03
PT		 176 rx->rx_wrq.sg_list = &rx->rx_sge;
177 rx->rx_wrq.num_sge = 1;
ec3d17c0 178 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
d7e09d03 179
af967b29
GM		 180 LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
181 LASSERT(rx->rx_nob >= 0); /* not posted */
d7e09d03
PT		 182
183 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
184 kiblnd_drop_rx(rx); /* No more posts for this rx */
185 return 0;
186 }
187
188 rx->rx_nob = -1; /* flag posted */
189
6fa3c577
LZ		 190 /* NB: need an extra reference after ib_post_recv because we don't
191 * own this rx (and rx::rx_conn) anymore, LU-5678.
192 */
193 kiblnd_conn_addref(conn);
d7e09d03 194 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
5fd88337 195 if (unlikely(rc)) {
d7e09d03
PT		 196 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
197 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
198 rx->rx_nob = 0;
199 }
200
201 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
6fa3c577 202 goto out;
d7e09d03 203
5fd88337 204 if (unlikely(rc)) {
d7e09d03
PT		 205 kiblnd_close_conn(conn, rc);
206 kiblnd_drop_rx(rx); /* No more posts for this rx */
6fa3c577 207 goto out;
d7e09d03
PT		 208 }
209
210 if (credit == IBLND_POSTRX_NO_CREDIT)
6fa3c577 211 goto out;
d7e09d03
PT		 212
213 spin_lock(&conn->ibc_lock);
214 if (credit == IBLND_POSTRX_PEER_CREDIT)
215 conn->ibc_outstanding_credits++;
216 else
217 conn->ibc_reserved_credits++;
218 spin_unlock(&conn->ibc_lock);
219
220 kiblnd_check_sends(conn);
6fa3c577
LZ		 221out:
222 kiblnd_conn_decref(conn);
223 return rc;
d7e09d03
PT		 224}
225
a8046a28 226static kib_tx_t *
d7e09d03
PT		 227kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
228{
ec3d17c0 229 struct list_head *tmp;
d7e09d03
PT		 230
231 list_for_each(tmp, &conn->ibc_active_txs) {
232 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
233
af967b29 234 LASSERT(!tx->tx_queued);
5fd88337 235 LASSERT(tx->tx_sending || tx->tx_waiting);
d7e09d03
PT		 236
237 if (tx->tx_cookie != cookie)
238 continue;
239
240 if (tx->tx_waiting &&
241 tx->tx_msg->ibm_type == txtype)
242 return tx;
243
244 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
245 tx->tx_waiting ? "" : "NOT ",
246 tx->tx_msg->ibm_type, txtype);
247 }
248 return NULL;
249}
250
a8046a28 251static void
d7e09d03
PT		 252kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
253{
ec3d17c0
MS		 254 kib_tx_t *tx;
255 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
256 int idle;
d7e09d03
PT		 257
258 spin_lock(&conn->ibc_lock);
259
260 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
06ace26e 261 if (!tx) {
d7e09d03
PT		 262 spin_unlock(&conn->ibc_lock);
263
55f5a824 264 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
d7e09d03
PT		 265 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
266 kiblnd_close_conn(conn, -EPROTO);
267 return;
268 }
269
5fd88337 270 if (!tx->tx_status) { /* success so far */
e03b80cf 271 if (status < 0) /* failed? */
d7e09d03 272 tx->tx_status = status;
e03b80cf 273 else if (txtype == IBLND_MSG_GET_REQ)
d7e09d03 274 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
d7e09d03
PT		 275 }
276
277 tx->tx_waiting = 0;
278
5fd88337 279 idle = !tx->tx_queued && !tx->tx_sending;
d7e09d03
PT		 280 if (idle)
281 list_del(&tx->tx_list);
282
283 spin_unlock(&conn->ibc_lock);
284
285 if (idle)
286 kiblnd_tx_done(ni, tx);
287}
288
a8046a28 289static void
d7e09d03
PT		 290kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
291{
ec3d17c0
MS		 292 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
293 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
d7e09d03 294
06ace26e 295 if (!tx) {
d7e09d03
PT		 296 CERROR("Can't get tx for completion %x for %s\n",
297 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
298 return;
299 }
300
301 tx->tx_msg->ibm_u.completion.ibcm_status = status;
302 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
303 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
304
305 kiblnd_queue_tx(tx, conn);
306}
307
a8046a28 308static void
af967b29 309kiblnd_handle_rx(kib_rx_t *rx)
d7e09d03 310{
ec3d17c0
MS		 311 kib_msg_t *msg = rx->rx_msg;
312 kib_conn_t *conn = rx->rx_conn;
313 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
314 int credits = msg->ibm_credits;
315 kib_tx_t *tx;
316 int rc = 0;
317 int rc2;
318 int post_credit;
d7e09d03 319
af967b29 320 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
d7e09d03 321
af967b29
GM		 322 CDEBUG(D_NET, "Received %x[%d] from %s\n",
323 msg->ibm_type, credits,
324 libcfs_nid2str(conn->ibc_peer->ibp_nid));
d7e09d03 325
5fd88337 326 if (credits) {
d7e09d03
PT		 327 /* Have I received credits that will let me send? */
328 spin_lock(&conn->ibc_lock);
329
330 if (conn->ibc_credits + credits >
2fb44f2b 331 conn->ibc_queue_depth) {
d7e09d03
PT		 332 rc2 = conn->ibc_credits;
333 spin_unlock(&conn->ibc_lock);
334
335 CERROR("Bad credits from %s: %d + %d > %d\n",
336 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2fb44f2b 337 rc2, credits, conn->ibc_queue_depth);
d7e09d03
PT		 338
339 kiblnd_close_conn(conn, -EPROTO);
340 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
341 return;
342 }
343
344 conn->ibc_credits += credits;
345
346 /* This ensures the credit taken by NOOP can be returned */
347 if (msg->ibm_type == IBLND_MSG_NOOP &&
348 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
349 conn->ibc_outstanding_credits++;
350
351 spin_unlock(&conn->ibc_lock);
352 kiblnd_check_sends(conn);
353 }
354
355 switch (msg->ibm_type) {
356 default:
357 CERROR("Bad IBLND message type %x from %s\n",
358 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
359 post_credit = IBLND_POSTRX_NO_CREDIT;
360 rc = -EPROTO;
361 break;
362
363 case IBLND_MSG_NOOP:
364 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
365 post_credit = IBLND_POSTRX_NO_CREDIT;
366 break;
367 }
368
5fd88337 369 if (credits) /* credit already posted */
d7e09d03
PT		 370 post_credit = IBLND_POSTRX_NO_CREDIT;
371 else /* a keepalive NOOP */
372 post_credit = IBLND_POSTRX_PEER_CREDIT;
373 break;
374
375 case IBLND_MSG_IMMEDIATE:
376 post_credit = IBLND_POSTRX_DONT_POST;
377 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
378 msg->ibm_srcnid, rx, 0);
379 if (rc < 0) /* repost on error */
380 post_credit = IBLND_POSTRX_PEER_CREDIT;
381 break;
382
383 case IBLND_MSG_PUT_REQ:
384 post_credit = IBLND_POSTRX_DONT_POST;
385 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
386 msg->ibm_srcnid, rx, 1);
387 if (rc < 0) /* repost on error */
388 post_credit = IBLND_POSTRX_PEER_CREDIT;
389 break;
390
391 case IBLND_MSG_PUT_NAK:
af967b29
GM		 392 CWARN("PUT_NACK from %s\n",
393 libcfs_nid2str(conn->ibc_peer->ibp_nid));
d7e09d03
PT		 394 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
395 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
396 msg->ibm_u.completion.ibcm_status,
397 msg->ibm_u.completion.ibcm_cookie);
398 break;
399
400 case IBLND_MSG_PUT_ACK:
401 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
402
403 spin_lock(&conn->ibc_lock);
404 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
c314c319 405 msg->ibm_u.putack.ibpam_src_cookie);
06ace26e 406 if (tx)
d7e09d03
PT		 407 list_del(&tx->tx_list);
408 spin_unlock(&conn->ibc_lock);
409
06ace26e 410 if (!tx) {
d7e09d03
PT		 411 CERROR("Unmatched PUT_ACK from %s\n",
412 libcfs_nid2str(conn->ibc_peer->ibp_nid));
413 rc = -EPROTO;
414 break;
415 }
416
af967b29 417 LASSERT(tx->tx_waiting);
4420cfd3
JS		 418 /*
419 * CAVEAT EMPTOR: I could be racing with tx_complete, but...
d7e09d03 420 * (a) I can overwrite tx_msg since my peer has received it!
4420cfd3
JS		 421 * (b) tx_waiting set tells tx_complete() it's not done.
422 */
d7e09d03
PT		 423 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
424
425 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
426 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
427 &msg->ibm_u.putack.ibpam_rd,
428 msg->ibm_u.putack.ibpam_dst_cookie);
429 if (rc2 < 0)
430 CERROR("Can't setup rdma for PUT to %s: %d\n",
431 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
432
433 spin_lock(&conn->ibc_lock);
434 tx->tx_waiting = 0; /* clear waiting and queue atomically */
435 kiblnd_queue_tx_locked(tx, conn);
436 spin_unlock(&conn->ibc_lock);
437 break;
438
439 case IBLND_MSG_PUT_DONE:
440 post_credit = IBLND_POSTRX_PEER_CREDIT;
441 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
442 msg->ibm_u.completion.ibcm_status,
443 msg->ibm_u.completion.ibcm_cookie);
444 break;
445
446 case IBLND_MSG_GET_REQ:
447 post_credit = IBLND_POSTRX_DONT_POST;
448 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
449 msg->ibm_srcnid, rx, 1);
450 if (rc < 0) /* repost on error */
451 post_credit = IBLND_POSTRX_PEER_CREDIT;
452 break;
453
454 case IBLND_MSG_GET_DONE:
455 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
456 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
457 msg->ibm_u.completion.ibcm_status,
458 msg->ibm_u.completion.ibcm_cookie);
459 break;
460 }
461
462 if (rc < 0) /* protocol error */
463 kiblnd_close_conn(conn, rc);
464
465 if (post_credit != IBLND_POSTRX_DONT_POST)
466 kiblnd_post_rx(rx, post_credit);
467}
468
a8046a28 469static void
6fe7f962 470kiblnd_rx_complete(kib_rx_t *rx, int status, int nob)
d7e09d03 471{
ec3d17c0
MS		 472 kib_msg_t *msg = rx->rx_msg;
473 kib_conn_t *conn = rx->rx_conn;
474 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
475 kib_net_t *net = ni->ni_data;
476 int rc;
477 int err = -EIO;
d7e09d03 478
06ace26e 479 LASSERT(net);
6fe7f962 480 LASSERT(rx->rx_nob < 0); /* was posted */
d7e09d03
PT		 481 rx->rx_nob = 0; /* isn't now */
482
483 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
484 goto ignore;
485
486 if (status != IB_WC_SUCCESS) {
487 CNETERR("Rx from %s failed: %d\n",
488 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
489 goto failed;
490 }
491
6fe7f962 492 LASSERT(nob >= 0);
d7e09d03
PT		 493 rx->rx_nob = nob;
494
495 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
5fd88337 496 if (rc) {
6fe7f962 497 CERROR("Error %d unpacking rx from %s\n",
c314c319 498 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
d7e09d03
PT		 499 goto failed;
500 }
501
502 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
503 msg->ibm_dstnid != ni->ni_nid ||
504 msg->ibm_srcstamp != conn->ibc_incarnation ||
505 msg->ibm_dststamp != net->ibn_incarnation) {
6fe7f962 506 CERROR("Stale rx from %s\n",
c314c319 507 libcfs_nid2str(conn->ibc_peer->ibp_nid));
d7e09d03
PT		 508 err = -ESTALE;
509 goto failed;
510 }
511
512 /* set time last known alive */
513 kiblnd_peer_alive(conn->ibc_peer);
514
515 /* racing with connection establishment/teardown! */
516
517 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
ec3d17c0
MS		 518 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
519 unsigned long flags;
d7e09d03
PT		 520
521 write_lock_irqsave(g_lock, flags);
522 /* must check holding global lock to eliminate race */
523 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
524 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
525 write_unlock_irqrestore(g_lock, flags);
526 return;
527 }
528 write_unlock_irqrestore(g_lock, flags);
529 }
530 kiblnd_handle_rx(rx);
531 return;
532
533 failed:
534 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
535 kiblnd_close_conn(conn, err);
536 ignore:
537 kiblnd_drop_rx(rx); /* Don't re-post rx. */
538}
539
a8046a28 540static struct page *
6fe7f962 541kiblnd_kvaddr_to_page(unsigned long vaddr)
d7e09d03
PT		 542{
543 struct page *page;
544
e92c0809 545 if (is_vmalloc_addr((void *)vaddr)) {
6fe7f962 546 page = vmalloc_to_page((void *)vaddr);
06ace26e 547 LASSERT(page);
d7e09d03
PT		 548 return page;
549 }
550#ifdef CONFIG_HIGHMEM
551 if (vaddr >= PKMAP_BASE &&
552 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
553 /* No highmem pages only used for bulk (kiov) I/O */
554 CERROR("find page for address in highmem\n");
555 LBUG();
556 }
557#endif
6fe7f962 558 page = virt_to_page(vaddr);
06ace26e 559 LASSERT(page);
d7e09d03
PT		 560 return page;
561}
562
563static int
c1b2e0b5 564kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, __u32 nob)
d7e09d03 565{
ec3d17c0 566 kib_hca_dev_t *hdev;
ec3d17c0 567 kib_fmr_poolset_t *fps;
ec3d17c0
MS		 568 int cpt;
569 int rc;
d7e09d03 570
06ace26e
JS		 571 LASSERT(tx->tx_pool);
572 LASSERT(tx->tx_pool->tpo_pool.po_owner);
d7e09d03 573
ec3d17c0 574 hdev = tx->tx_pool->tpo_hdev;
d7e09d03
PT		 575 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
576
577 fps = net->ibn_fmr_ps[cpt];
80e05b34 578 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->fmr);
5fd88337 579 if (rc) {
80e05b34 580 CERROR("Can't map %u bytes: %d\n", nob, rc);
d7e09d03
PT		 581 return rc;
582 }
583
4420cfd3
JS		 584 /*
585 * If rd is not tx_rd, it's going to get sent to a peer, who will need
586 * the rkey
587 */
c1b2e0b5 588 rd->rd_key = tx->fmr.fmr_key;
d7e09d03 589 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
ec3d17c0 590 rd->rd_frags[0].rf_nob = nob;
d7e09d03
PT		 591 rd->rd_nfrags = 1;
592
593 return 0;
594}
595
2f3622b9 596static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
d7e09d03 597{
ec3d17c0 598 kib_net_t *net = ni->ni_data;
d7e09d03 599
06ace26e 600 LASSERT(net);
d7e09d03 601
1f199a0c 602 if (net->ibn_fmr_ps)
415bcb5c 603 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
d7e09d03 604
5fd88337 605 if (tx->tx_nfrags) {
d7e09d03
PT		 606 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
607 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
608 tx->tx_nfrags = 0;
609 }
610}
611
2f3622b9
IH		 612static int kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
613 int nfrags)
d7e09d03 614{
ec3d17c0 615 kib_net_t *net = ni->ni_data;
32c8deb8 616 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
ec3d17c0
MS		 617 struct ib_mr *mr = NULL;
618 __u32 nob;
619 int i;
d7e09d03 620
4420cfd3
JS		 621 /*
622 * If rd is not tx_rd, it's going to get sent to a peer and I'm the
623 * RDMA sink
624 */
d7e09d03
PT		 625 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
626 tx->tx_nfrags = nfrags;
627
ec3d17c0
MS		 628 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
629 tx->tx_nfrags, tx->tx_dmadir);
d7e09d03
PT		 630
631 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
632 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
633 hdev->ibh_ibdev, &tx->tx_frags[i]);
634 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
635 hdev->ibh_ibdev, &tx->tx_frags[i]);
636 nob += rd->rd_frags[i].rf_nob;
637 }
638
32c8deb8 639 mr = kiblnd_find_rd_dma_mr(ni, rd, tx->tx_conn ?
2fb44f2b 640 tx->tx_conn->ibc_max_frags : -1);
06ace26e 641 if (mr) {
d7e09d03
PT		 642 /* found pre-mapping MR */
643 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
644 return 0;
645 }
646
06ace26e 647 if (net->ibn_fmr_ps)
d7e09d03 648 return kiblnd_fmr_map_tx(net, tx, rd, nob);
d7e09d03
PT		 649
650 return -EINVAL;
651}
652
a8046a28 653static int
d7e09d03 654kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
f351bad2 655 unsigned int niov, struct kvec *iov, int offset, int nob)
d7e09d03 656{
ec3d17c0
MS		 657 kib_net_t *net = ni->ni_data;
658 struct page *page;
d7e09d03 659 struct scatterlist *sg;
ec3d17c0
MS		 660 unsigned long vaddr;
661 int fragnob;
662 int page_offset;
d7e09d03 663
6fe7f962
GM		 664 LASSERT(nob > 0);
665 LASSERT(niov > 0);
06ace26e 666 LASSERT(net);
d7e09d03
PT		 667
668 while (offset >= iov->iov_len) {
669 offset -= iov->iov_len;
670 niov--;
671 iov++;
6fe7f962 672 LASSERT(niov > 0);
d7e09d03
PT		 673 }
674
675 sg = tx->tx_frags;
676 do {
6fe7f962 677 LASSERT(niov > 0);
d7e09d03
PT		 678
679 vaddr = ((unsigned long)iov->iov_base) + offset;
680 page_offset = vaddr & (PAGE_SIZE - 1);
681 page = kiblnd_kvaddr_to_page(vaddr);
06ace26e 682 if (!page) {
6fe7f962 683 CERROR("Can't find page\n");
d7e09d03
PT		 684 return -EFAULT;
685 }
686
687 fragnob = min((int)(iov->iov_len - offset), nob);
688 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
689
690 sg_set_page(sg, page, fragnob, page_offset);
3d147730 691 sg = sg_next(sg);
d7e09d03
PT		 692
693 if (offset + fragnob < iov->iov_len) {
694 offset += fragnob;
695 } else {
696 offset = 0;
697 iov++;
698 niov--;
699 }
700 nob -= fragnob;
701 } while (nob > 0);
702
703 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
704}
705
a8046a28 706static int
6fe7f962 707kiblnd_setup_rd_kiov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
c314c319 708 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
d7e09d03 709{
ec3d17c0 710 kib_net_t *net = ni->ni_data;
d7e09d03 711 struct scatterlist *sg;
ec3d17c0 712 int fragnob;
d7e09d03
PT		 713
714 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
715
6fe7f962
GM		 716 LASSERT(nob > 0);
717 LASSERT(nkiov > 0);
06ace26e 718 LASSERT(net);
d7e09d03
PT		 719
720 while (offset >= kiov->kiov_len) {
721 offset -= kiov->kiov_len;
722 nkiov--;
723 kiov++;
6fe7f962 724 LASSERT(nkiov > 0);
d7e09d03
PT		 725 }
726
727 sg = tx->tx_frags;
728 do {
6fe7f962 729 LASSERT(nkiov > 0);
d7e09d03
PT		 730
731 fragnob = min((int)(kiov->kiov_len - offset), nob);
732
733 sg_set_page(sg, kiov->kiov_page, fragnob,
734 kiov->kiov_offset + offset);
3d147730 735 sg = sg_next(sg);
d7e09d03
PT		 736
737 offset = 0;
738 kiov++;
739 nkiov--;
740 nob -= fragnob;
741 } while (nob > 0);
742
743 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
744}
745
a8046a28 746static int
6fe7f962 747kiblnd_post_tx_locked(kib_conn_t *conn, kib_tx_t *tx, int credit)
a161de86 748 __must_hold(&conn->ibc_lock)
d7e09d03 749{
ec3d17c0
MS		 750 kib_msg_t *msg = tx->tx_msg;
751 kib_peer_t *peer = conn->ibc_peer;
9e7d5bf3 752 struct lnet_ni *ni = peer->ibp_ni;
ec3d17c0
MS		 753 int ver = conn->ibc_version;
754 int rc;
755 int done;
d7e09d03 756
6fe7f962 757 LASSERT(tx->tx_queued);
d7e09d03 758 /* We rely on this for QP sizing */
6fe7f962 759 LASSERT(tx->tx_nwrq > 0);
2fb44f2b 760 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
d7e09d03 761
5fd88337 762 LASSERT(!credit || credit == 1);
6fe7f962 763 LASSERT(conn->ibc_outstanding_credits >= 0);
2fb44f2b 764 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
6fe7f962 765 LASSERT(conn->ibc_credits >= 0);
2fb44f2b 766 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
d7e09d03 767
9e7d5bf3 768 if (conn->ibc_nsends_posted == kiblnd_concurrent_sends(ver, ni)) {
d7e09d03
PT		 769 /* tx completions outstanding... */
770 CDEBUG(D_NET, "%s: posted enough\n",
771 libcfs_nid2str(peer->ibp_nid));
772 return -EAGAIN;
773 }
774
5fd88337 775 if (credit && !conn->ibc_credits) { /* no credits */
d7e09d03
PT		 776 CDEBUG(D_NET, "%s: no credits\n",
777 libcfs_nid2str(peer->ibp_nid));
778 return -EAGAIN;
779 }
780
5fd88337 781 if (credit && !IBLND_OOB_CAPABLE(ver) &&
d7e09d03
PT		 782 conn->ibc_credits == 1 && /* last credit reserved */
783 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
784 CDEBUG(D_NET, "%s: not using last credit\n",
785 libcfs_nid2str(peer->ibp_nid));
786 return -EAGAIN;
787 }
788
789 /* NB don't drop ibc_lock before bumping tx_sending */
790 list_del(&tx->tx_list);
791 tx->tx_queued = 0;
792
793 if (msg->ibm_type == IBLND_MSG_NOOP &&
794 (!kiblnd_need_noop(conn) || /* redundant NOOP */
795 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
796 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
4420cfd3
JS		 797 /*
798 * OK to drop when posted enough NOOPs, since
d7e09d03 799 * kiblnd_check_sends will queue NOOP again when
4420cfd3
JS		 800 * posted NOOPs complete
801 */
d7e09d03
PT		 802 spin_unlock(&conn->ibc_lock);
803 kiblnd_tx_done(peer->ibp_ni, tx);
804 spin_lock(&conn->ibc_lock);
805 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
806 libcfs_nid2str(peer->ibp_nid),
807 conn->ibc_noops_posted);
808 return 0;
809 }
810
811 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
812 peer->ibp_nid, conn->ibc_incarnation);
813
814 conn->ibc_credits -= credit;
815 conn->ibc_outstanding_credits = 0;
816 conn->ibc_nsends_posted++;
817 if (msg->ibm_type == IBLND_MSG_NOOP)
818 conn->ibc_noops_posted++;
819
4420cfd3
JS		 820 /*
821 * CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
d7e09d03
PT		 822 * PUT. If so, it was first queued here as a PUT_REQ, sent and
823 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
824 * and then re-queued here. It's (just) possible that
825 * tx_sending is non-zero if we've not done the tx_complete()
4420cfd3
JS		 826 * from the first send; hence the ++ rather than = below.
827 */
d7e09d03
PT		 828 tx->tx_sending++;
829 list_add(&tx->tx_list, &conn->ibc_active_txs);
830
831 /* I'm still holding ibc_lock! */
832 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
833 rc = -ECONNABORTED;
834 } else if (tx->tx_pool->tpo_pool.po_failed ||
835 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
836 /* close_conn will launch failover */
837 rc = -ENETDOWN;
838 } else {
80e05b34
DE		 839 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
840 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
841 struct ib_send_wr *wrq = &tx->tx_wrq[0].wr;
842
843 if (frd) {
844 if (!frd->frd_valid) {
845 wrq = &frd->frd_inv_wr;
846 wrq->next = &frd->frd_fastreg_wr.wr;
847 } else {
848 wrq = &frd->frd_fastreg_wr.wr;
849 }
850 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
851 }
82fffff4 852
80e05b34 853 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
82fffff4 854 "bad wr_id %llx, opc %d, flags %d, peer: %s\n",
80e05b34
DE		 855 bad->wr_id, bad->opcode, bad->send_flags,
856 libcfs_nid2str(conn->ibc_peer->ibp_nid));
857 bad = NULL;
858 rc = ib_post_send(conn->ibc_cmid->qp, wrq, &bad);
d7e09d03
PT		 859 }
860
861 conn->ibc_last_send = jiffies;
862
5fd88337 863 if (!rc)
d7e09d03
PT		 864 return 0;
865
4420cfd3
JS		 866 /*
867 * NB credits are transferred in the actual
868 * message, which can only be the last work item
869 */
d7e09d03
PT		 870 conn->ibc_credits += credit;
871 conn->ibc_outstanding_credits += msg->ibm_credits;
872 conn->ibc_nsends_posted--;
873 if (msg->ibm_type == IBLND_MSG_NOOP)
874 conn->ibc_noops_posted--;
875
876 tx->tx_status = rc;
877 tx->tx_waiting = 0;
878 tx->tx_sending--;
879
5fd88337 880 done = !tx->tx_sending;
d7e09d03
PT		 881 if (done)
882 list_del(&tx->tx_list);
883
884 spin_unlock(&conn->ibc_lock);
885
886 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
887 CERROR("Error %d posting transmit to %s\n",
888 rc, libcfs_nid2str(peer->ibp_nid));
889 else
890 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
891 rc, libcfs_nid2str(peer->ibp_nid));
892
893 kiblnd_close_conn(conn, rc);
894
895 if (done)
896 kiblnd_tx_done(peer->ibp_ni, tx);
897
898 spin_lock(&conn->ibc_lock);
899
900 return -EIO;
901}
902
3667cded 903static void
6fe7f962 904kiblnd_check_sends(kib_conn_t *conn)
d7e09d03 905{
ec3d17c0 906 int ver = conn->ibc_version;
d7e09d03 907 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
ec3d17c0 908 kib_tx_t *tx;
d7e09d03
PT		 909
910 /* Don't send anything until after the connection is established */
911 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
912 CDEBUG(D_NET, "%s too soon\n",
913 libcfs_nid2str(conn->ibc_peer->ibp_nid));
914 return;
915 }
916
917 spin_lock(&conn->ibc_lock);
918
9e7d5bf3 919 LASSERT(conn->ibc_nsends_posted <= kiblnd_concurrent_sends(ver, ni));
6fe7f962 920 LASSERT(!IBLND_OOB_CAPABLE(ver) ||
c314c319 921 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
6fe7f962 922 LASSERT(conn->ibc_reserved_credits >= 0);
d7e09d03
PT		 923
924 while (conn->ibc_reserved_credits > 0 &&
925 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
926 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
c314c319 927 kib_tx_t, tx_list);
d7e09d03
PT		 928 list_del(&tx->tx_list);
929 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
930 conn->ibc_reserved_credits--;
931 }
932
933 if (kiblnd_need_noop(conn)) {
934 spin_unlock(&conn->ibc_lock);
935
936 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
06ace26e 937 if (tx)
d7e09d03
PT		 938 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
939
940 spin_lock(&conn->ibc_lock);
06ace26e 941 if (tx)
d7e09d03
PT		 942 kiblnd_queue_tx_locked(tx, conn);
943 }
944
d7e09d03
PT		 945 for (;;) {
946 int credit;
947
948 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
949 credit = 0;
950 tx = list_entry(conn->ibc_tx_queue_nocred.next,
c314c319 951 kib_tx_t, tx_list);
d7e09d03 952 } else if (!list_empty(&conn->ibc_tx_noops)) {
6fe7f962 953 LASSERT(!IBLND_OOB_CAPABLE(ver));
d7e09d03
PT		 954 credit = 1;
955 tx = list_entry(conn->ibc_tx_noops.next,
956 kib_tx_t, tx_list);
957 } else if (!list_empty(&conn->ibc_tx_queue)) {
958 credit = 1;
959 tx = list_entry(conn->ibc_tx_queue.next,
c314c319 960 kib_tx_t, tx_list);
06f2f2f2 961 } else {
d7e09d03 962 break;
06f2f2f2 963 }
d7e09d03 964
5fd88337 965 if (kiblnd_post_tx_locked(conn, tx, credit))
d7e09d03
PT		 966 break;
967 }
968
969 spin_unlock(&conn->ibc_lock);
d7e09d03
PT		 970}
971
a8046a28 972static void
6fe7f962 973kiblnd_tx_complete(kib_tx_t *tx, int status)
d7e09d03 974{
ec3d17c0
MS		 975 int failed = (status != IB_WC_SUCCESS);
976 kib_conn_t *conn = tx->tx_conn;
977 int idle;
d7e09d03 978
6fe7f962 979 LASSERT(tx->tx_sending > 0);
d7e09d03
PT		 980
981 if (failed) {
982 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
55f5a824 983 CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
d7e09d03
PT		 984 libcfs_nid2str(conn->ibc_peer->ibp_nid),
985 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
986 status);
987
988 kiblnd_close_conn(conn, -EIO);
989 } else {
990 kiblnd_peer_alive(conn->ibc_peer);
991 }
992
993 spin_lock(&conn->ibc_lock);
994
4420cfd3
JS		 995 /*
996 * I could be racing with rdma completion. Whoever makes 'tx' idle
997 * gets to free it, which also drops its ref on 'conn'.
998 */
d7e09d03
PT		 999 tx->tx_sending--;
1000 conn->ibc_nsends_posted--;
1001 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1002 conn->ibc_noops_posted--;
1003
1004 if (failed) {
1005 tx->tx_waiting = 0; /* don't wait for peer */
1006 tx->tx_status = -EIO;
1007 }
1008
5fd88337 1009 idle = !tx->tx_sending && /* This is the final callback */
d7e09d03
PT		 1010 !tx->tx_waiting && /* Not waiting for peer */
1011 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1012 if (idle)
1013 list_del(&tx->tx_list);
1014
1015 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1016
1017 spin_unlock(&conn->ibc_lock);
1018
1019 if (idle)
1020 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1021
1022 kiblnd_check_sends(conn);
1023
1024 kiblnd_conn_decref(conn); /* ...until here */
1025}
1026
3667cded 1027static void
6fe7f962 1028kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
d7e09d03 1029{
ec3d17c0
MS		 1030 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1031 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
e622f2f4 1032 struct ib_rdma_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
ec3d17c0 1033 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
7cadcc7c 1034 struct ib_mr *mr = hdev->ibh_mrs;
d7e09d03 1035
6fe7f962
GM		 1036 LASSERT(tx->tx_nwrq >= 0);
1037 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1038 LASSERT(nob <= IBLND_MSG_SIZE);
7cadcc7c 1039 LASSERT(mr);
d7e09d03
PT		 1040
1041 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1042
d7e09d03
PT		 1043 sge->lkey = mr->lkey;
1044 sge->addr = tx->tx_msgaddr;
1045 sge->length = nob;
1046
1047 memset(wrq, 0, sizeof(*wrq));
1048
e622f2f4
CH		 1049 wrq->wr.next = NULL;
1050 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1051 wrq->wr.sg_list = sge;
1052 wrq->wr.num_sge = 1;
1053 wrq->wr.opcode = IB_WR_SEND;
1054 wrq->wr.send_flags = IB_SEND_SIGNALED;
d7e09d03
PT		 1055
1056 tx->tx_nwrq++;
1057}
1058
3667cded 1059static int
6fe7f962 1060kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
c314c319 1061 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
d7e09d03 1062{
ec3d17c0
MS		 1063 kib_msg_t *ibmsg = tx->tx_msg;
1064 kib_rdma_desc_t *srcrd = tx->tx_rd;
1065 struct ib_sge *sge = &tx->tx_sge[0];
80e05b34 1066 struct ib_rdma_wr *wrq, *next;
ec3d17c0 1067 int rc = resid;
d3d3d37a
JS		 1068 int srcidx = 0;
1069 int dstidx = 0;
ec3d17c0 1070 int wrknob;
d7e09d03 1071
6fe7f962 1072 LASSERT(!in_interrupt());
5fd88337 1073 LASSERT(!tx->tx_nwrq);
6fe7f962 1074 LASSERT(type == IBLND_MSG_GET_DONE ||
c314c319 1075 type == IBLND_MSG_PUT_DONE);
d7e09d03 1076
d7e09d03
PT		 1077 while (resid > 0) {
1078 if (srcidx >= srcrd->rd_nfrags) {
1079 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1080 rc = -EPROTO;
1081 break;
1082 }
1083
1084 if (dstidx == dstrd->rd_nfrags) {
1085 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1086 rc = -EPROTO;
1087 break;
1088 }
1089
2fb44f2b
JF		 1090 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1091 CERROR("RDMA has too many fragments for peer %s (%d), src idx/frags: %d/%d dst idx/frags: %d/%d\n",
d7e09d03 1092 libcfs_nid2str(conn->ibc_peer->ibp_nid),
2fb44f2b 1093 conn->ibc_max_frags,
d7e09d03
PT		 1094 srcidx, srcrd->rd_nfrags,
1095 dstidx, dstrd->rd_nfrags);
1096 rc = -EMSGSIZE;
1097 break;
1098 }
1099
0c575417 1100 wrknob = min(min(kiblnd_rd_frag_size(srcrd, srcidx),
a1ccbf9c
JM		 1101 kiblnd_rd_frag_size(dstrd, dstidx)),
1102 (__u32) resid);
d7e09d03
PT		 1103
1104 sge = &tx->tx_sge[tx->tx_nwrq];
1105 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1106 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1107 sge->length = wrknob;
1108
1109 wrq = &tx->tx_wrq[tx->tx_nwrq];
e622f2f4 1110 next = wrq + 1;
d7e09d03 1111
e622f2f4
CH		 1112 wrq->wr.next = &next->wr;
1113 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1114 wrq->wr.sg_list = sge;
1115 wrq->wr.num_sge = 1;
1116 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1117 wrq->wr.send_flags = 0;
d7e09d03 1118
e622f2f4
CH		 1119 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1120 wrq->rkey = kiblnd_rd_frag_key(dstrd, dstidx);
d7e09d03
PT		 1121
1122 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1123 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1124
1125 resid -= wrknob;
1126
1127 tx->tx_nwrq++;
1128 wrq++;
1129 sge++;
1130 }
1131
1132 if (rc < 0) /* no RDMA if completing with failure */
1133 tx->tx_nwrq = 0;
1134
1135 ibmsg->ibm_u.completion.ibcm_status = rc;
1136 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1137 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
6fe7f962 1138 type, sizeof(kib_completion_msg_t));
d7e09d03
PT		 1139
1140 return rc;
1141}
1142
3667cded 1143static void
6fe7f962 1144kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
d7e09d03 1145{
ec3d17c0 1146 struct list_head *q;
d7e09d03 1147
6fe7f962
GM		 1148 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1149 LASSERT(!tx->tx_queued); /* not queued for sending already */
1150 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
d7e09d03
PT		 1151
1152 tx->tx_queued = 1;
27d81ace
JY		 1153 tx->tx_deadline = jiffies +
1154 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1155 MSEC_PER_SEC);
d7e09d03 1156
06ace26e 1157 if (!tx->tx_conn) {
d7e09d03
PT		 1158 kiblnd_conn_addref(conn);
1159 tx->tx_conn = conn;
6fe7f962 1160 LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
d7e09d03
PT		 1161 } else {
1162 /* PUT_DONE first attached to conn as a PUT_REQ */
6fe7f962
GM		 1163 LASSERT(tx->tx_conn == conn);
1164 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
d7e09d03
PT		 1165 }
1166
1167 switch (tx->tx_msg->ibm_type) {
1168 default:
1169 LBUG();
1170
1171 case IBLND_MSG_PUT_REQ:
1172 case IBLND_MSG_GET_REQ:
1173 q = &conn->ibc_tx_queue_rsrvd;
1174 break;
1175
1176 case IBLND_MSG_PUT_NAK:
1177 case IBLND_MSG_PUT_ACK:
1178 case IBLND_MSG_PUT_DONE:
1179 case IBLND_MSG_GET_DONE:
1180 q = &conn->ibc_tx_queue_nocred;
1181 break;
1182
1183 case IBLND_MSG_NOOP:
1184 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1185 q = &conn->ibc_tx_queue_nocred;
1186 else
1187 q = &conn->ibc_tx_noops;
1188 break;
1189
1190 case IBLND_MSG_IMMEDIATE:
1191 q = &conn->ibc_tx_queue;
1192 break;
1193 }
1194
1195 list_add_tail(&tx->tx_list, q);
1196}
1197
3667cded 1198static void
6fe7f962 1199kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn)
d7e09d03
PT		 1200{
1201 spin_lock(&conn->ibc_lock);
1202 kiblnd_queue_tx_locked(tx, conn);
1203 spin_unlock(&conn->ibc_lock);
1204
1205 kiblnd_check_sends(conn);
1206}
1207
1208static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1209 struct sockaddr_in *srcaddr,
1210 struct sockaddr_in *dstaddr,
1211 int timeout_ms)
1212{
1213 unsigned short port;
1214 int rc;
1215
1216 /* allow the port to be reused */
1217 rc = rdma_set_reuseaddr(cmid, 1);
5fd88337 1218 if (rc) {
d7e09d03
PT		 1219 CERROR("Unable to set reuse on cmid: %d\n", rc);
1220 return rc;
1221 }
1222
1223 /* look for a free privileged port */
51078e25 1224 for (port = PROT_SOCK - 1; port > 0; port--) {
d7e09d03
PT		 1225 srcaddr->sin_port = htons(port);
1226 rc = rdma_resolve_addr(cmid,
1227 (struct sockaddr *)srcaddr,
1228 (struct sockaddr *)dstaddr,
1229 timeout_ms);
5fd88337 1230 if (!rc) {
d7e09d03
PT		 1231 CDEBUG(D_NET, "bound to port %hu\n", port);
1232 return 0;
1233 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1234 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1235 port, rc);
1236 } else {
1237 return rc;
1238 }
1239 }
1240
1241 CERROR("Failed to bind to a free privileged port\n");
1242 return rc;
1243}
1244
a8046a28 1245static void
6fe7f962 1246kiblnd_connect_peer(kib_peer_t *peer)
d7e09d03
PT		 1247{
1248 struct rdma_cm_id *cmid;
ec3d17c0
MS		 1249 kib_dev_t *dev;
1250 kib_net_t *net = peer->ibp_ni->ni_data;
d7e09d03
PT		 1251 struct sockaddr_in srcaddr;
1252 struct sockaddr_in dstaddr;
ec3d17c0 1253 int rc;
d7e09d03 1254
06ace26e 1255 LASSERT(net);
6fe7f962 1256 LASSERT(peer->ibp_connecting > 0);
4d99b258 1257 LASSERT(!peer->ibp_reconnecting);
d7e09d03
PT		 1258
1259 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1260 IB_QPT_RC);
1261
1262 if (IS_ERR(cmid)) {
1263 CERROR("Can't create CMID for %s: %ld\n",
1264 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1265 rc = PTR_ERR(cmid);
1266 goto failed;
1267 }
1268
1269 dev = net->ibn_dev;
1270 memset(&srcaddr, 0, sizeof(srcaddr));
1271 srcaddr.sin_family = AF_INET;
1272 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1273
1274 memset(&dstaddr, 0, sizeof(dstaddr));
1275 dstaddr.sin_family = AF_INET;
1276 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1277 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1278
1279 kiblnd_peer_addref(peer); /* cmid's ref */
1280
1281 if (*kiblnd_tunables.kib_use_priv_port) {
1282 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1283 *kiblnd_tunables.kib_timeout * 1000);
1284 } else {
1285 rc = rdma_resolve_addr(cmid,
1286 (struct sockaddr *)&srcaddr,
1287 (struct sockaddr *)&dstaddr,
1288 *kiblnd_tunables.kib_timeout * 1000);
1289 }
5fd88337 1290 if (rc) {
d7e09d03
PT		 1291 /* Can't initiate address resolution: */
1292 CERROR("Can't resolve addr for %s: %d\n",
1293 libcfs_nid2str(peer->ibp_nid), rc);
1294 goto failed2;
1295 }
1296
06ace26e 1297 LASSERT(cmid->device);
5e8f6920 1298 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
d7e09d03 1299 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
5e8f6920 1300 &dev->ibd_ifip, cmid->device->name);
d7e09d03
PT		 1301
1302 return;
1303
1304 failed2:
a70d69ae 1305 kiblnd_peer_connect_failed(peer, 1, rc);
d7e09d03
PT		 1306 kiblnd_peer_decref(peer); /* cmid's ref */
1307 rdma_destroy_id(cmid);
a70d69ae 1308 return;
d7e09d03
PT		 1309 failed:
1310 kiblnd_peer_connect_failed(peer, 1, rc);
1311}
1312
4d99b258
LZ		 1313bool
1314kiblnd_reconnect_peer(kib_peer_t *peer)
1315{
1316 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1317 char *reason = NULL;
1318 struct list_head txs;
1319 unsigned long flags;
1320
1321 INIT_LIST_HEAD(&txs);
1322
1323 write_lock_irqsave(glock, flags);
1324 if (!peer->ibp_reconnecting) {
1325 if (peer->ibp_accepting)
1326 reason = "accepting";
1327 else if (peer->ibp_connecting)
1328 reason = "connecting";
1329 else if (!list_empty(&peer->ibp_conns))
1330 reason = "connected";
1331 else /* connected then closed */
1332 reason = "closed";
1333
1334 goto no_reconnect;
1335 }
1336
1337 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1338 list_empty(&peer->ibp_conns));
1339 peer->ibp_reconnecting = 0;
1340
1341 if (!kiblnd_peer_active(peer)) {
1342 list_splice_init(&peer->ibp_tx_queue, &txs);
1343 reason = "unlinked";
1344 goto no_reconnect;
1345 }
1346
1347 peer->ibp_connecting++;
1348 peer->ibp_reconnected++;
1349 write_unlock_irqrestore(glock, flags);
1350
1351 kiblnd_connect_peer(peer);
1352 return true;
1353
1354no_reconnect:
1355 write_unlock_irqrestore(glock, flags);
1356
1357 CWARN("Abort reconnection of %s: %s\n",
1358 libcfs_nid2str(peer->ibp_nid), reason);
1359 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1360 return false;
1361}
1362
d7e09d03 1363void
6fe7f962 1364kiblnd_launch_tx(lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
d7e09d03 1365{
ec3d17c0
MS		 1366 kib_peer_t *peer;
1367 kib_peer_t *peer2;
1368 kib_conn_t *conn;
1369 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1370 unsigned long flags;
1371 int rc;
d7e09d03 1372
4420cfd3
JS		 1373 /*
1374 * If I get here, I've committed to send, so I complete the tx with
1375 * failure on any problems
1376 */
06ace26e
JS		 1377 LASSERT(!tx || !tx->tx_conn); /* only set when assigned a conn */
1378 LASSERT(!tx || tx->tx_nwrq > 0); /* work items have been set up */
d7e09d03 1379
4420cfd3
JS		 1380 /*
1381 * First time, just use a read lock since I expect to find my peer
1382 * connected
1383 */
d7e09d03
PT		 1384 read_lock_irqsave(g_lock, flags);
1385
1386 peer = kiblnd_find_peer_locked(nid);
06ace26e 1387 if (peer && !list_empty(&peer->ibp_conns)) {
d7e09d03
PT		 1388 /* Found a peer with an established connection */
1389 conn = kiblnd_get_conn_locked(peer);
1390 kiblnd_conn_addref(conn); /* 1 ref for me... */
1391
1392 read_unlock_irqrestore(g_lock, flags);
1393
06ace26e 1394 if (tx)
d7e09d03
PT		 1395 kiblnd_queue_tx(tx, conn);
1396 kiblnd_conn_decref(conn); /* ...to here */
1397 return;
1398 }
1399
1400 read_unlock(g_lock);
1401 /* Re-try with a write lock */
1402 write_lock(g_lock);
1403
1404 peer = kiblnd_find_peer_locked(nid);
06ace26e 1405 if (peer) {
d7e09d03
PT		 1406 if (list_empty(&peer->ibp_conns)) {
1407 /* found a peer, but it's still connecting... */
4d99b258 1408 LASSERT(kiblnd_peer_connecting(peer));
06ace26e 1409 if (tx)
d7e09d03 1410 list_add_tail(&tx->tx_list,
c314c319 1411 &peer->ibp_tx_queue);
d7e09d03
PT		 1412 write_unlock_irqrestore(g_lock, flags);
1413 } else {
1414 conn = kiblnd_get_conn_locked(peer);
1415 kiblnd_conn_addref(conn); /* 1 ref for me... */
1416
1417 write_unlock_irqrestore(g_lock, flags);
1418
06ace26e 1419 if (tx)
d7e09d03
PT		 1420 kiblnd_queue_tx(tx, conn);
1421 kiblnd_conn_decref(conn); /* ...to here */
1422 }
1423 return;
1424 }
1425
1426 write_unlock_irqrestore(g_lock, flags);
1427
1428 /* Allocate a peer ready to add to the peer table and retry */
1429 rc = kiblnd_create_peer(ni, &peer, nid);
5fd88337 1430 if (rc) {
d7e09d03 1431 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
06ace26e 1432 if (tx) {
d7e09d03
PT		 1433 tx->tx_status = -EHOSTUNREACH;
1434 tx->tx_waiting = 0;
1435 kiblnd_tx_done(ni, tx);
1436 }
1437 return;
1438 }
1439
1440 write_lock_irqsave(g_lock, flags);
1441
1442 peer2 = kiblnd_find_peer_locked(nid);
06ace26e 1443 if (peer2) {
d7e09d03
PT		 1444 if (list_empty(&peer2->ibp_conns)) {
1445 /* found a peer, but it's still connecting... */
4d99b258 1446 LASSERT(kiblnd_peer_connecting(peer2));
06ace26e 1447 if (tx)
d7e09d03 1448 list_add_tail(&tx->tx_list,
c314c319 1449 &peer2->ibp_tx_queue);
d7e09d03
PT		 1450 write_unlock_irqrestore(g_lock, flags);
1451 } else {
1452 conn = kiblnd_get_conn_locked(peer2);
1453 kiblnd_conn_addref(conn); /* 1 ref for me... */
1454
1455 write_unlock_irqrestore(g_lock, flags);
1456
06ace26e 1457 if (tx)
d7e09d03
PT		 1458 kiblnd_queue_tx(tx, conn);
1459 kiblnd_conn_decref(conn); /* ...to here */
1460 }
1461
1462 kiblnd_peer_decref(peer);
1463 return;
1464 }
1465
1466 /* Brand new peer */
5fd88337 1467 LASSERT(!peer->ibp_connecting);
d7e09d03
PT		 1468 peer->ibp_connecting = 1;
1469
1470 /* always called with a ref on ni, which prevents ni being shutdown */
5fd88337 1471 LASSERT(!((kib_net_t *)ni->ni_data)->ibn_shutdown);
d7e09d03 1472
06ace26e 1473 if (tx)
d7e09d03
PT		 1474 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1475
1476 kiblnd_peer_addref(peer);
1477 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1478
1479 write_unlock_irqrestore(g_lock, flags);
1480
1481 kiblnd_connect_peer(peer);
1482 kiblnd_peer_decref(peer);
1483}
1484
1485int
6fe7f962 1486kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
d7e09d03 1487{
ec3d17c0
MS		 1488 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1489 int type = lntmsg->msg_type;
d7e09d03 1490 lnet_process_id_t target = lntmsg->msg_target;
ec3d17c0
MS		 1491 int target_is_router = lntmsg->msg_target_is_router;
1492 int routing = lntmsg->msg_routing;
1493 unsigned int payload_niov = lntmsg->msg_niov;
1494 struct kvec *payload_iov = lntmsg->msg_iov;
1495 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1496 unsigned int payload_offset = lntmsg->msg_offset;
1497 unsigned int payload_nob = lntmsg->msg_len;
1498 kib_msg_t *ibmsg;
2f3622b9 1499 kib_rdma_desc_t *rd;
ec3d17c0
MS		 1500 kib_tx_t *tx;
1501 int nob;
1502 int rc;
d7e09d03
PT		 1503
1504 /* NB 'private' is different depending on what we're sending.... */
1505
1506 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1507 payload_nob, payload_niov, libcfs_id2str(target));
1508
5fd88337 1509 LASSERT(!payload_nob || payload_niov > 0);
6fe7f962 1510 LASSERT(payload_niov <= LNET_MAX_IOV);
d7e09d03
PT		 1511
1512 /* Thread context */
6fe7f962 1513 LASSERT(!in_interrupt());
d7e09d03 1514 /* payload is either all vaddrs or all pages */
06ace26e 1515 LASSERT(!(payload_kiov && payload_iov));
d7e09d03
PT		 1516
1517 switch (type) {
1518 default:
1519 LBUG();
fbe7c6c7 1520 return -EIO;
d7e09d03
PT		 1521
1522 case LNET_MSG_ACK:
5fd88337 1523 LASSERT(!payload_nob);
d7e09d03
PT		 1524 break;
1525
1526 case LNET_MSG_GET:
1527 if (routing || target_is_router)
1528 break; /* send IMMEDIATE */
1529
1530 /* is the REPLY message too small for RDMA? */
1531 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1532 if (nob <= IBLND_MSG_SIZE)
1533 break; /* send IMMEDIATE */
1534
1535 tx = kiblnd_get_idle_tx(ni, target.nid);
06ace26e 1536 if (!tx) {
d7e09d03
PT		 1537 CERROR("Can't allocate txd for GET to %s\n",
1538 libcfs_nid2str(target.nid));
1539 return -ENOMEM;
1540 }
1541
1542 ibmsg = tx->tx_msg;
2f3622b9 1543 rd = &ibmsg->ibm_u.get.ibgm_rd;
5fd88337 1544 if (!(lntmsg->msg_md->md_options & LNET_MD_KIOV))
2f3622b9 1545 rc = kiblnd_setup_rd_iov(ni, tx, rd,
d7e09d03
PT		 1546 lntmsg->msg_md->md_niov,
1547 lntmsg->msg_md->md_iov.iov,
1548 0, lntmsg->msg_md->md_length);
1549 else
2f3622b9 1550 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
d7e09d03
PT		 1551 lntmsg->msg_md->md_niov,
1552 lntmsg->msg_md->md_iov.kiov,
1553 0, lntmsg->msg_md->md_length);
5fd88337 1554 if (rc) {
d7e09d03
PT		 1555 CERROR("Can't setup GET sink for %s: %d\n",
1556 libcfs_nid2str(target.nid), rc);
1557 kiblnd_tx_done(ni, tx);
1558 return -EIO;
1559 }
1560
2f3622b9 1561 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
d7e09d03
PT		 1562 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1563 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1564
1565 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1566
1567 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
06ace26e 1568 if (!tx->tx_lntmsg[1]) {
d7e09d03
PT		 1569 CERROR("Can't create reply for GET -> %s\n",
1570 libcfs_nid2str(target.nid));
1571 kiblnd_tx_done(ni, tx);
1572 return -EIO;
1573 }
1574
1575 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1576 tx->tx_waiting = 1; /* waiting for GET_DONE */
1577 kiblnd_launch_tx(ni, tx, target.nid);
1578 return 0;
1579
1580 case LNET_MSG_REPLY:
1581 case LNET_MSG_PUT:
1582 /* Is the payload small enough not to need RDMA? */
1583 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1584 if (nob <= IBLND_MSG_SIZE)
1585 break; /* send IMMEDIATE */
1586
1587 tx = kiblnd_get_idle_tx(ni, target.nid);
06ace26e 1588 if (!tx) {
d7e09d03
PT		 1589 CERROR("Can't allocate %s txd for %s\n",
1590 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1591 libcfs_nid2str(target.nid));
1592 return -ENOMEM;
1593 }
1594
06ace26e 1595 if (!payload_kiov)
d7e09d03
PT		 1596 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1597 payload_niov, payload_iov,
1598 payload_offset, payload_nob);
1599 else
1600 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1601 payload_niov, payload_kiov,
1602 payload_offset, payload_nob);
5fd88337 1603 if (rc) {
d7e09d03
PT		 1604 CERROR("Can't setup PUT src for %s: %d\n",
1605 libcfs_nid2str(target.nid), rc);
1606 kiblnd_tx_done(ni, tx);
1607 return -EIO;
1608 }
1609
1610 ibmsg = tx->tx_msg;
1611 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1612 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1613 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1614
1615 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1616 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1617 kiblnd_launch_tx(ni, tx, target.nid);
1618 return 0;
1619 }
1620
1621 /* send IMMEDIATE */
1622
6fe7f962 1623 LASSERT(offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
d7e09d03
PT		 1624 <= IBLND_MSG_SIZE);
1625
1626 tx = kiblnd_get_idle_tx(ni, target.nid);
06ace26e 1627 if (!tx) {
6fe7f962 1628 CERROR("Can't send %d to %s: tx descs exhausted\n",
c314c319 1629 type, libcfs_nid2str(target.nid));
d7e09d03
PT		 1630 return -ENOMEM;
1631 }
1632
1633 ibmsg = tx->tx_msg;
1634 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1635
06ace26e 1636 if (payload_kiov)
d7e09d03
PT		 1637 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1638 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1639 payload_niov, payload_kiov,
1640 payload_offset, payload_nob);
1641 else
1642 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1643 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1644 payload_niov, payload_iov,
1645 payload_offset, payload_nob);
1646
1647 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1648 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1649
1650 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1651 kiblnd_launch_tx(ni, tx, target.nid);
1652 return 0;
1653}
1654
a8046a28 1655static void
6fe7f962 1656kiblnd_reply(lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
d7e09d03
PT		 1657{
1658 lnet_process_id_t target = lntmsg->msg_target;
ec3d17c0
MS		 1659 unsigned int niov = lntmsg->msg_niov;
1660 struct kvec *iov = lntmsg->msg_iov;
1661 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1662 unsigned int offset = lntmsg->msg_offset;
1663 unsigned int nob = lntmsg->msg_len;
1664 kib_tx_t *tx;
1665 int rc;
d7e09d03
PT		 1666
1667 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
06ace26e 1668 if (!tx) {
d7e09d03
PT		 1669 CERROR("Can't get tx for REPLY to %s\n",
1670 libcfs_nid2str(target.nid));
1671 goto failed_0;
1672 }
1673
5fd88337 1674 if (!nob)
d7e09d03 1675 rc = 0;
06ace26e 1676 else if (!kiov)
d7e09d03
PT		 1677 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1678 niov, iov, offset, nob);
1679 else
1680 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1681 niov, kiov, offset, nob);
1682
5fd88337 1683 if (rc) {
d7e09d03
PT		 1684 CERROR("Can't setup GET src for %s: %d\n",
1685 libcfs_nid2str(target.nid), rc);
1686 goto failed_1;
1687 }
1688
1689 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1690 IBLND_MSG_GET_DONE, nob,
1691 &rx->rx_msg->ibm_u.get.ibgm_rd,
1692 rx->rx_msg->ibm_u.get.ibgm_cookie);
1693 if (rc < 0) {
1694 CERROR("Can't setup rdma for GET from %s: %d\n",
1695 libcfs_nid2str(target.nid), rc);
1696 goto failed_1;
1697 }
1698
5fd88337 1699 if (!nob) {
d7e09d03
PT		 1700 /* No RDMA: local completion may happen now! */
1701 lnet_finalize(ni, lntmsg, 0);
1702 } else {
4420cfd3 1703 /* RDMA: lnet_finalize(lntmsg) when it completes */
d7e09d03
PT		 1704 tx->tx_lntmsg[0] = lntmsg;
1705 }
1706
1707 kiblnd_queue_tx(tx, rx->rx_conn);
1708 return;
1709
1710 failed_1:
1711 kiblnd_tx_done(ni, tx);
1712 failed_0:
1713 lnet_finalize(ni, lntmsg, -EIO);
1714}
1715
1716int
6fe7f962 1717kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
c314c319
JS		 1718 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1719 unsigned int offset, unsigned int mlen, unsigned int rlen)
d7e09d03 1720{
ec3d17c0
MS		 1721 kib_rx_t *rx = private;
1722 kib_msg_t *rxmsg = rx->rx_msg;
1723 kib_conn_t *conn = rx->rx_conn;
1724 kib_tx_t *tx;
ec3d17c0
MS		 1725 int nob;
1726 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1727 int rc = 0;
d7e09d03 1728
6fe7f962
GM		 1729 LASSERT(mlen <= rlen);
1730 LASSERT(!in_interrupt());
d7e09d03 1731 /* Either all pages or all vaddrs */
06ace26e 1732 LASSERT(!(kiov && iov));
d7e09d03
PT		 1733
1734 switch (rxmsg->ibm_type) {
1735 default:
1736 LBUG();
1737
1738 case IBLND_MSG_IMMEDIATE:
1739 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1740 if (nob > rx->rx_nob) {
6fe7f962 1741 CERROR("Immediate message from %s too big: %d(%d)\n",
c314c319
JS		 1742 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1743 nob, rx->rx_nob);
d7e09d03
PT		 1744 rc = -EPROTO;
1745 break;
1746 }
1747
06ace26e 1748 if (kiov)
d7e09d03
PT		 1749 lnet_copy_flat2kiov(niov, kiov, offset,
1750 IBLND_MSG_SIZE, rxmsg,
1751 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1752 mlen);
1753 else
1754 lnet_copy_flat2iov(niov, iov, offset,
1755 IBLND_MSG_SIZE, rxmsg,
1756 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1757 mlen);
6fe7f962 1758 lnet_finalize(ni, lntmsg, 0);
d7e09d03
PT		 1759 break;
1760
2f3622b9
IH		 1761 case IBLND_MSG_PUT_REQ: {
1762 kib_msg_t *txmsg;
1763 kib_rdma_desc_t *rd;
1764
5fd88337 1765 if (!mlen) {
d7e09d03
PT		 1766 lnet_finalize(ni, lntmsg, 0);
1767 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1768 rxmsg->ibm_u.putreq.ibprm_cookie);
1769 break;
1770 }
1771
1772 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
06ace26e 1773 if (!tx) {
d7e09d03
PT		 1774 CERROR("Can't allocate tx for %s\n",
1775 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1776 /* Not replying will break the connection */
1777 rc = -ENOMEM;
1778 break;
1779 }
1780
1781 txmsg = tx->tx_msg;
2f3622b9 1782 rd = &txmsg->ibm_u.putack.ibpam_rd;
06ace26e 1783 if (!kiov)
2f3622b9 1784 rc = kiblnd_setup_rd_iov(ni, tx, rd,
d7e09d03
PT		 1785 niov, iov, offset, mlen);
1786 else
2f3622b9 1787 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
d7e09d03 1788 niov, kiov, offset, mlen);
5fd88337 1789 if (rc) {
d7e09d03
PT		 1790 CERROR("Can't setup PUT sink for %s: %d\n",
1791 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1792 kiblnd_tx_done(ni, tx);
1793 /* tell peer it's over */
1794 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1795 rxmsg->ibm_u.putreq.ibprm_cookie);
1796 break;
1797 }
1798
2f3622b9 1799 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
d7e09d03
PT		 1800 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1801 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1802
1803 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1804
1805 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1806 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1807 kiblnd_queue_tx(tx, conn);
1808
1809 /* reposted buffer reserved for PUT_DONE */
1810 post_credit = IBLND_POSTRX_NO_CREDIT;
1811 break;
2f3622b9 1812 }
d7e09d03
PT		 1813
1814 case IBLND_MSG_GET_REQ:
06ace26e 1815 if (lntmsg) {
d7e09d03
PT		 1816 /* Optimized GET; RDMA lntmsg's payload */
1817 kiblnd_reply(ni, rx, lntmsg);
1818 } else {
1819 /* GET didn't match anything */
1820 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1821 -ENODATA,
1822 rxmsg->ibm_u.get.ibgm_cookie);
1823 }
1824 break;
1825 }
1826
1827 kiblnd_post_rx(rx, post_credit);
1828 return rc;
1829}
1830
1831int
1832kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1833{
9edf0f67 1834 struct task_struct *task = kthread_run(fn, arg, "%s", name);
d7e09d03
PT		 1835
1836 if (IS_ERR(task))
1837 return PTR_ERR(task);
1838
1839 atomic_inc(&kiblnd_data.kib_nthreads);
1840 return 0;
1841}
1842
a8046a28 1843static void
6fe7f962 1844kiblnd_thread_fini(void)
d7e09d03 1845{
6fe7f962 1846 atomic_dec(&kiblnd_data.kib_nthreads);
d7e09d03
PT		 1847}
1848
3667cded 1849static void
6fe7f962 1850kiblnd_peer_alive(kib_peer_t *peer)
d7e09d03
PT		 1851{
1852 /* This is racy, but everyone's only writing cfs_time_current() */
1853 peer->ibp_last_alive = cfs_time_current();
1854 mb();
1855}
1856
a8046a28 1857static void
6fe7f962 1858kiblnd_peer_notify(kib_peer_t *peer)
d7e09d03 1859{
ec3d17c0
MS		 1860 int error = 0;
1861 unsigned long last_alive = 0;
d7e09d03
PT		 1862 unsigned long flags;
1863
1864 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1865
4d99b258 1866 if (kiblnd_peer_idle(peer) && peer->ibp_error) {
d7e09d03
PT		 1867 error = peer->ibp_error;
1868 peer->ibp_error = 0;
1869
1870 last_alive = peer->ibp_last_alive;
1871 }
1872
1873 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1874
5fd88337 1875 if (error)
d7e09d03
PT		 1876 lnet_notify(peer->ibp_ni,
1877 peer->ibp_nid, 0, last_alive);
1878}
1879
1880void
6fe7f962 1881kiblnd_close_conn_locked(kib_conn_t *conn, int error)
d7e09d03 1882{
4420cfd3
JS		 1883 /*
1884 * This just does the immediate housekeeping. 'error' is zero for a
d7e09d03
PT		 1885 * normal shutdown which can happen only after the connection has been
1886 * established. If the connection is established, schedule the
4420cfd3 1887 * connection to be finished off by the connd. Otherwise the connd is
d7e09d03 1888 * already dealing with it (either to set it up or tear it down).
4420cfd3
JS		 1889 * Caller holds kib_global_lock exclusively in irq context
1890 */
ec3d17c0
MS		 1891 kib_peer_t *peer = conn->ibc_peer;
1892 kib_dev_t *dev;
1893 unsigned long flags;
d7e09d03 1894
5fd88337 1895 LASSERT(error || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
d7e09d03 1896
5fd88337 1897 if (error && !conn->ibc_comms_error)
d7e09d03
PT		 1898 conn->ibc_comms_error = error;
1899
1900 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1901 return; /* already being handled */
1902
5fd88337 1903 if (!error &&
d7e09d03
PT		 1904 list_empty(&conn->ibc_tx_noops) &&
1905 list_empty(&conn->ibc_tx_queue) &&
1906 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1907 list_empty(&conn->ibc_tx_queue_nocred) &&
1908 list_empty(&conn->ibc_active_txs)) {
1909 CDEBUG(D_NET, "closing conn to %s\n",
1910 libcfs_nid2str(peer->ibp_nid));
1911 } else {
1912 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
c314c319
JS		 1913 libcfs_nid2str(peer->ibp_nid), error,
1914 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1915 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1916 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1917 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1918 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
d7e09d03
PT		 1919 }
1920
1921 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1922 list_del(&conn->ibc_list);
1923 /* connd (see below) takes over ibc_list's ref */
1924
6fe7f962 1925 if (list_empty(&peer->ibp_conns) && /* no more conns */
d7e09d03
PT		 1926 kiblnd_peer_active(peer)) { /* still in peer table */
1927 kiblnd_unlink_peer_locked(peer);
1928
1929 /* set/clear error on last conn */
1930 peer->ibp_error = conn->ibc_comms_error;
1931 }
1932
1933 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1934
5fd88337 1935 if (error &&
d7e09d03
PT		 1936 kiblnd_dev_can_failover(dev)) {
1937 list_add_tail(&dev->ibd_fail_list,
1938 &kiblnd_data.kib_failed_devs);
1939 wake_up(&kiblnd_data.kib_failover_waitq);
1940 }
1941
1942 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1943
1944 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1945 wake_up(&kiblnd_data.kib_connd_waitq);
1946
1947 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1948}
1949
1950void
1951kiblnd_close_conn(kib_conn_t *conn, int error)
1952{
1953 unsigned long flags;
1954
1955 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1956
1957 kiblnd_close_conn_locked(conn, error);
1958
1959 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1960}
1961
a8046a28 1962static void
d7e09d03
PT		 1963kiblnd_handle_early_rxs(kib_conn_t *conn)
1964{
ec3d17c0
MS		 1965 unsigned long flags;
1966 kib_rx_t *rx;
5a2ca43f 1967 kib_rx_t *tmp;
d7e09d03
PT		 1968
1969 LASSERT(!in_interrupt());
1970 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1971
1972 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
5a2ca43f 1973 list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
d7e09d03
PT		 1974 list_del(&rx->rx_list);
1975 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1976
1977 kiblnd_handle_rx(rx);
1978
1979 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1980 }
1981 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1982}
1983
a8046a28 1984static void
d7e09d03
PT		 1985kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1986{
6fe7f962 1987 LIST_HEAD(zombies);
ec3d17c0
MS		 1988 struct list_head *tmp;
1989 struct list_head *nxt;
1990 kib_tx_t *tx;
d7e09d03
PT		 1991
1992 spin_lock(&conn->ibc_lock);
1993
6fe7f962
GM		 1994 list_for_each_safe(tmp, nxt, txs) {
1995 tx = list_entry(tmp, kib_tx_t, tx_list);
d7e09d03
PT		 1996
1997 if (txs == &conn->ibc_active_txs) {
6fe7f962 1998 LASSERT(!tx->tx_queued);
5fd88337 1999 LASSERT(tx->tx_waiting || tx->tx_sending);
d7e09d03 2000 } else {
6fe7f962 2001 LASSERT(tx->tx_queued);
d7e09d03
PT		 2002 }
2003
2004 tx->tx_status = -ECONNABORTED;
2005 tx->tx_waiting = 0;
2006
5fd88337 2007 if (!tx->tx_sending) {
d7e09d03 2008 tx->tx_queued = 0;
6fe7f962
GM		 2009 list_del(&tx->tx_list);
2010 list_add(&tx->tx_list, &zombies);
d7e09d03
PT		 2011 }
2012 }
2013
2014 spin_unlock(&conn->ibc_lock);
2015
2016 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2017}
2018
a8046a28 2019static void
6fe7f962 2020kiblnd_finalise_conn(kib_conn_t *conn)
d7e09d03 2021{
6fe7f962
GM		 2022 LASSERT(!in_interrupt());
2023 LASSERT(conn->ibc_state > IBLND_CONN_INIT);
d7e09d03
PT		 2024
2025 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2026
4420cfd3
JS		 2027 /*
2028 * abort_receives moves QP state to IB_QPS_ERR. This is only required
d7e09d03 2029 * for connections that didn't get as far as being connected, because
4420cfd3
JS		 2030 * rdma_disconnect() does this for free.
2031 */
d7e09d03
PT		 2032 kiblnd_abort_receives(conn);
2033
4420cfd3
JS		 2034 /*
2035 * Complete all tx descs not waiting for sends to complete.
2036 * NB we should be safe from RDMA now that the QP has changed state
2037 */
d7e09d03
PT		 2038 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2039 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2040 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2041 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2042 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2043
2044 kiblnd_handle_early_rxs(conn);
2045}
2046
3667cded 2047static void
6fe7f962 2048kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
d7e09d03 2049{
6fe7f962 2050 LIST_HEAD(zombies);
ec3d17c0 2051 unsigned long flags;
d7e09d03 2052
5fd88337 2053 LASSERT(error);
6fe7f962 2054 LASSERT(!in_interrupt());
d7e09d03
PT		 2055
2056 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2057
2058 if (active) {
6fe7f962 2059 LASSERT(peer->ibp_connecting > 0);
d7e09d03
PT		 2060 peer->ibp_connecting--;
2061 } else {
6fe7f962 2062 LASSERT(peer->ibp_accepting > 0);
d7e09d03
PT		 2063 peer->ibp_accepting--;
2064 }
2065
4d99b258 2066 if (kiblnd_peer_connecting(peer)) {
d7e09d03
PT		 2067 /* another connection attempt under way... */
2068 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
c314c319 2069 flags);
d7e09d03
PT		 2070 return;
2071 }
2072
4d99b258 2073 peer->ibp_reconnected = 0;
d7e09d03
PT		 2074 if (list_empty(&peer->ibp_conns)) {
2075 /* Take peer's blocked transmits to complete with error */
2076 list_add(&zombies, &peer->ibp_tx_queue);
2077 list_del_init(&peer->ibp_tx_queue);
2078
2079 if (kiblnd_peer_active(peer))
2080 kiblnd_unlink_peer_locked(peer);
2081
2082 peer->ibp_error = error;
2083 } else {
2084 /* Can't have blocked transmits if there are connections */
6fe7f962 2085 LASSERT(list_empty(&peer->ibp_tx_queue));
d7e09d03
PT		 2086 }
2087
2088 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2089
2090 kiblnd_peer_notify(peer);
2091
6fe7f962 2092 if (list_empty(&zombies))
d7e09d03
PT		 2093 return;
2094
2095 CNETERR("Deleting messages for %s: connection failed\n",
2096 libcfs_nid2str(peer->ibp_nid));
2097
2098 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2099}
2100
3667cded 2101static void
d7e09d03
PT		 2102kiblnd_connreq_done(kib_conn_t *conn, int status)
2103{
ec3d17c0
MS		 2104 kib_peer_t *peer = conn->ibc_peer;
2105 kib_tx_t *tx;
5a2ca43f 2106 kib_tx_t *tmp;
ec3d17c0
MS		 2107 struct list_head txs;
2108 unsigned long flags;
2109 int active;
d7e09d03
PT		 2110
2111 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2112
1d8cb70c 2113 CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
d7e09d03
PT		 2114 libcfs_nid2str(peer->ibp_nid), active,
2115 conn->ibc_version, status);
2116
6fe7f962
GM		 2117 LASSERT(!in_interrupt());
2118 LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
c314c319 2119 peer->ibp_connecting > 0) ||
d7e09d03 2120 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
c314c319 2121 peer->ibp_accepting > 0));
d7e09d03
PT		 2122
2123 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2124 conn->ibc_connvars = NULL;
2125
5fd88337 2126 if (status) {
d7e09d03
PT		 2127 /* failed to establish connection */
2128 kiblnd_peer_connect_failed(peer, active, status);
2129 kiblnd_finalise_conn(conn);
2130 return;
2131 }
2132
2133 /* connection established */
2134 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2135
2136 conn->ibc_last_send = jiffies;
2137 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2138 kiblnd_peer_alive(peer);
2139
4420cfd3
JS		 2140 /*
2141 * Add conn to peer's list and nuke any dangling conns from a different
2142 * peer instance...
2143 */
d7e09d03
PT		 2144 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2145 list_add(&conn->ibc_list, &peer->ibp_conns);
4d99b258 2146 peer->ibp_reconnected = 0;
d7e09d03
PT		 2147 if (active)
2148 peer->ibp_connecting--;
2149 else
2150 peer->ibp_accepting--;
2151
5fd88337 2152 if (!peer->ibp_version) {
d7e09d03
PT		 2153 peer->ibp_version = conn->ibc_version;
2154 peer->ibp_incarnation = conn->ibc_incarnation;
2155 }
2156
2157 if (peer->ibp_version != conn->ibc_version ||
2158 peer->ibp_incarnation != conn->ibc_incarnation) {
2159 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2160 conn->ibc_incarnation);
2161 peer->ibp_version = conn->ibc_version;
2162 peer->ibp_incarnation = conn->ibc_incarnation;
2163 }
2164
2165 /* grab pending txs while I have the lock */
2166 list_add(&txs, &peer->ibp_tx_queue);
2167 list_del_init(&peer->ibp_tx_queue);
2168
2169 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
5fd88337 2170 conn->ibc_comms_error) { /* error has happened already */
d7e09d03
PT		 2171 lnet_ni_t *ni = peer->ibp_ni;
2172
2173 /* start to shut down connection */
2174 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2175 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2176
2177 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2178
2179 return;
2180 }
2181
992f0b22
LZ		 2182 /**
2183 * refcount taken by cmid is not reliable after I released the glock
2184 * because this connection is visible to other threads now, another
2185 * thread can find and close this connection right after I released
2186 * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2187 * called, it can release the connection refcount taken by cmid.
2188 * It means the connection could be destroyed before I finish my
2189 * operations on it.
2190 */
2191 kiblnd_conn_addref(conn);
d7e09d03
PT		 2192 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2193
2194 /* Schedule blocked txs */
2195 spin_lock(&conn->ibc_lock);
5a2ca43f 2196 list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
d7e09d03
PT		 2197 list_del(&tx->tx_list);
2198
2199 kiblnd_queue_tx_locked(tx, conn);
2200 }
2201 spin_unlock(&conn->ibc_lock);
2202
2203 kiblnd_check_sends(conn);
2204
2205 /* schedule blocked rxs */
2206 kiblnd_handle_early_rxs(conn);
992f0b22
LZ		 2207
2208 kiblnd_conn_decref(conn);
d7e09d03
PT		 2209}
2210
a8046a28 2211static void
d7e09d03
PT		 2212kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2213{
ec3d17c0 2214 int rc;
d7e09d03
PT		 2215
2216 rc = rdma_reject(cmid, rej, sizeof(*rej));
2217
5fd88337 2218 if (rc)
d7e09d03
PT		 2219 CWARN("Error %d sending reject\n", rc);
2220}
2221
a8046a28 2222static int
6fe7f962 2223kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
d7e09d03 2224{
ec3d17c0
MS		 2225 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2226 kib_msg_t *reqmsg = priv;
2227 kib_msg_t *ackmsg;
2228 kib_dev_t *ibdev;
2229 kib_peer_t *peer;
2230 kib_peer_t *peer2;
2231 kib_conn_t *conn;
2232 lnet_ni_t *ni = NULL;
2233 kib_net_t *net = NULL;
2234 lnet_nid_t nid;
d7e09d03 2235 struct rdma_conn_param cp;
ec3d17c0
MS		 2236 kib_rej_t rej;
2237 int version = IBLND_MSG_VERSION;
2238 unsigned long flags;
2239 int rc;
2240 struct sockaddr_in *peer_addr;
50ffcb7e 2241
6fe7f962 2242 LASSERT(!in_interrupt());
d7e09d03
PT		 2243
2244 /* cmid inherits 'context' from the corresponding listener id */
2245 ibdev = (kib_dev_t *)cmid->context;
06ace26e 2246 LASSERT(ibdev);
d7e09d03
PT		 2247
2248 memset(&rej, 0, sizeof(rej));
ec3d17c0
MS		 2249 rej.ibr_magic = IBLND_MSG_MAGIC;
2250 rej.ibr_why = IBLND_REJECT_FATAL;
d7e09d03
PT		 2251 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2252
0eee6778 2253 peer_addr = (struct sockaddr_in *)&cmid->route.addr.dst_addr;
d7e09d03
PT		 2254 if (*kiblnd_tunables.kib_require_priv_port &&
2255 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2256 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
50ffcb7e 2257
5e8f6920
PT		 2258 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2259 &ip, ntohs(peer_addr->sin_port));
d7e09d03
PT		 2260 goto failed;
2261 }
2262
2263 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2264 CERROR("Short connection request\n");
2265 goto failed;
2266 }
2267
4420cfd3
JS		 2268 /*
2269 * Future protocol version compatibility support! If the
d7e09d03
PT		 2270 * o2iblnd-specific protocol changes, or when LNET unifies
2271 * protocols over all LNDs, the initial connection will
2272 * negotiate a protocol version. I trap this here to avoid
2273 * console errors; the reject tells the peer which protocol I
4420cfd3
JS		 2274 * speak.
2275 */
d7e09d03
PT		 2276 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2277 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2278 goto failed;
2279 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2280 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2281 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2282 goto failed;
2283 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2284 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2285 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2286 goto failed;
2287
2288 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
5fd88337 2289 if (rc) {
d7e09d03
PT		 2290 CERROR("Can't parse connection request: %d\n", rc);
2291 goto failed;
2292 }
2293
2294 nid = reqmsg->ibm_srcnid;
ec3d17c0 2295 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
d7e09d03 2296
06ace26e 2297 if (ni) {
d7e09d03
PT		 2298 net = (kib_net_t *)ni->ni_data;
2299 rej.ibr_incarnation = net->ibn_incarnation;
2300 }
2301
06ace26e 2302 if (!ni || /* no matching net */
d7e09d03
PT		 2303 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2304 net->ibn_dev != ibdev) { /* wrong device */
2fb44f2b 2305 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
2d00bd17 2306 libcfs_nid2str(nid),
06ace26e 2307 !ni ? "NA" : libcfs_nid2str(ni->ni_nid),
d7e09d03 2308 ibdev->ibd_ifname, ibdev->ibd_nnets,
5e8f6920 2309 &ibdev->ibd_ifip,
d7e09d03
PT		 2310 libcfs_nid2str(reqmsg->ibm_dstnid));
2311
2312 goto failed;
2313 }
2314
2315 /* check time stamp as soon as possible */
5fd88337 2316 if (reqmsg->ibm_dststamp &&
d7e09d03
PT		 2317 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2318 CWARN("Stale connection request\n");
2319 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2320 goto failed;
2321 }
2322
2323 /* I can accept peer's version */
2324 version = reqmsg->ibm_version;
2325
2326 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2327 CERROR("Unexpected connreq msg type: %x from %s\n",
2328 reqmsg->ibm_type, libcfs_nid2str(nid));
2329 goto failed;
2330 }
2331
2fb44f2b 2332 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
9e7d5bf3 2333 kiblnd_msg_queue_size(version, ni)) {
2fb44f2b
JF		 2334 CERROR("Can't accept conn from %s, queue depth too large: %d (<=%d wanted)\n",
2335 libcfs_nid2str(nid),
2336 reqmsg->ibm_u.connparams.ibcp_queue_depth,
9e7d5bf3 2337 kiblnd_msg_queue_size(version, ni));
d7e09d03
PT		 2338
2339 if (version == IBLND_MSG_VERSION)
2340 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2341
2342 goto failed;
2343 }
2344
2fb44f2b 2345 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
9e7d5bf3 2346 kiblnd_rdma_frags(version, ni)) {
2fb44f2b
JF		 2347 CWARN("Can't accept conn from %s (version %x): max_frags %d too large (%d wanted)\n",
2348 libcfs_nid2str(nid), version,
2349 reqmsg->ibm_u.connparams.ibcp_max_frags,
9e7d5bf3 2350 kiblnd_rdma_frags(version, ni));
d7e09d03 2351
2fb44f2b
JF		 2352 if (version >= IBLND_MSG_VERSION)
2353 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2354
2355 goto failed;
2356 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
9e7d5bf3 2357 kiblnd_rdma_frags(version, ni) && !net->ibn_fmr_ps) {
2fb44f2b
JF		 2358 CWARN("Can't accept conn from %s (version %x): max_frags %d incompatible without FMR pool (%d wanted)\n",
2359 libcfs_nid2str(nid), version,
2360 reqmsg->ibm_u.connparams.ibcp_max_frags,
9e7d5bf3 2361 kiblnd_rdma_frags(version, ni));
2fb44f2b 2362
2c6a1845 2363 if (version == IBLND_MSG_VERSION)
d7e09d03
PT		 2364 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2365
2366 goto failed;
d7e09d03
PT		 2367 }
2368
2369 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2370 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2371 libcfs_nid2str(nid),
2372 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2373 IBLND_MSG_SIZE);
2374 goto failed;
2375 }
2376
2377 /* assume 'nid' is a new peer; create */
2378 rc = kiblnd_create_peer(ni, &peer, nid);
5fd88337 2379 if (rc) {
d7e09d03
PT		 2380 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2381 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2382 goto failed;
2383 }
2384
a01fa108
AS		 2385 /* We have validated the peer's parameters so use those */
2386 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2387 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2388
d7e09d03
PT		 2389 write_lock_irqsave(g_lock, flags);
2390
2391 peer2 = kiblnd_find_peer_locked(nid);
06ace26e 2392 if (peer2) {
5fd88337 2393 if (!peer2->ibp_version) {
d7e09d03
PT		 2394 peer2->ibp_version = version;
2395 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2396 }
2397
2398 /* not the guy I've talked with */
2399 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2400 peer2->ibp_version != version) {
2401 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
4d99b258
LZ		 2402
2403 if (kiblnd_peer_active(peer2)) {
2404 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2405 peer2->ibp_version = version;
2406 }
d7e09d03
PT		 2407 write_unlock_irqrestore(g_lock, flags);
2408
4d99b258
LZ		 2409 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2410 libcfs_nid2str(nid), peer2->ibp_version, version,
2411 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
d7e09d03
PT		 2412
2413 kiblnd_peer_decref(peer);
2414 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2415 goto failed;
2416 }
2417
2418 /* tie-break connection race in favour of the higher NID */
5fd88337 2419 if (peer2->ibp_connecting &&
d7e09d03
PT		 2420 nid < ni->ni_nid) {
2421 write_unlock_irqrestore(g_lock, flags);
2422
2423 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2424
2425 kiblnd_peer_decref(peer);
2426 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2427 goto failed;
2428 }
2429
4d99b258
LZ		 2430 /**
2431 * passive connection is allowed even this peer is waiting for
2432 * reconnection.
2433 */
2434 peer2->ibp_reconnecting = 0;
d7e09d03
PT		 2435 peer2->ibp_accepting++;
2436 kiblnd_peer_addref(peer2);
2437
a01fa108
AS		 2438 /**
2439 * Race with kiblnd_launch_tx (active connect) to create peer
2440 * so copy validated parameters since we now know what the
2441 * peer's limits are
2442 */
2443 peer2->ibp_max_frags = peer->ibp_max_frags;
2444 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2445
d7e09d03
PT		 2446 write_unlock_irqrestore(g_lock, flags);
2447 kiblnd_peer_decref(peer);
2448 peer = peer2;
2449 } else {
2450 /* Brand new peer */
5fd88337
JS		 2451 LASSERT(!peer->ibp_accepting);
2452 LASSERT(!peer->ibp_version &&
2453 !peer->ibp_incarnation);
d7e09d03
PT		 2454
2455 peer->ibp_accepting = 1;
2456 peer->ibp_version = version;
2457 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2458
2459 /* I have a ref on ni that prevents it being shutdown */
5fd88337 2460 LASSERT(!net->ibn_shutdown);
d7e09d03
PT		 2461
2462 kiblnd_peer_addref(peer);
2463 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2464
2465 write_unlock_irqrestore(g_lock, flags);
2466 }
2467
a01fa108
AS		 2468 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT,
2469 version);
06ace26e 2470 if (!conn) {
d7e09d03
PT		 2471 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2472 kiblnd_peer_decref(peer);
2473 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2474 goto failed;
2475 }
2476
4420cfd3
JS		 2477 /*
2478 * conn now "owns" cmid, so I return success from here on to ensure the
2479 * CM callback doesn't destroy cmid.
2480 */
d7e09d03 2481 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
a01fa108
AS		 2482 conn->ibc_credits = conn->ibc_queue_depth;
2483 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2fb44f2b
JF		 2484 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2485 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
d7e09d03
PT		 2486
2487 ackmsg = &conn->ibc_connvars->cv_msg;
2488 memset(ackmsg, 0, sizeof(*ackmsg));
2489
2490 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2491 sizeof(ackmsg->ibm_u.connparams));
a01fa108
AS		 2492 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2493 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
d7e09d03 2494 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
d7e09d03
PT		 2495
2496 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2497
2498 memset(&cp, 0, sizeof(cp));
2499 cp.private_data = ackmsg;
ec3d17c0 2500 cp.private_data_len = ackmsg->ibm_nob;
d7e09d03 2501 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
ec3d17c0 2502 cp.initiator_depth = 0;
d7e09d03 2503 cp.flow_control = 1;
ec3d17c0
MS		 2504 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2505 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
d7e09d03
PT		 2506
2507 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2508
2509 rc = rdma_accept(cmid, &cp);
5fd88337 2510 if (rc) {
d7e09d03
PT		 2511 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2512 rej.ibr_version = version;
2513 rej.ibr_why = IBLND_REJECT_FATAL;
2514
2515 kiblnd_reject(cmid, &rej);
2516 kiblnd_connreq_done(conn, rc);
2517 kiblnd_conn_decref(conn);
2518 }
2519
2520 lnet_ni_decref(ni);
2521 return 0;
2522
2523 failed:
a9cc4006 2524 if (ni) {
d7e09d03 2525 lnet_ni_decref(ni);
a9cc4006
DO		 2526 rej.ibr_cp.ibcp_queue_depth = kiblnd_msg_queue_size(version, ni);
2527 rej.ibr_cp.ibcp_max_frags = kiblnd_rdma_frags(version, ni);
2528 }
d7e09d03 2529
ec3d17c0 2530 rej.ibr_version = version;
d7e09d03
PT		 2531 kiblnd_reject(cmid, &rej);
2532
2533 return -ECONNREFUSED;
2534}
2535
a8046a28 2536static void
4d99b258
LZ		 2537kiblnd_check_reconnect(kib_conn_t *conn, int version,
2538 __u64 incarnation, int why, kib_connparams_t *cp)
d7e09d03 2539{
4d99b258 2540 rwlock_t *glock = &kiblnd_data.kib_global_lock;
ec3d17c0
MS		 2541 kib_peer_t *peer = conn->ibc_peer;
2542 char *reason;
4d99b258
LZ		 2543 int msg_size = IBLND_MSG_SIZE;
2544 int frag_num = -1;
2545 int queue_dep = -1;
2546 bool reconnect;
ec3d17c0 2547 unsigned long flags;
d7e09d03 2548
6fe7f962
GM		 2549 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2550 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
4d99b258 2551 LASSERT(!peer->ibp_reconnecting);
d7e09d03 2552
4d99b258
LZ		 2553 if (cp) {
2554 msg_size = cp->ibcp_max_msg_size;
2555 frag_num = cp->ibcp_max_frags;
2556 queue_dep = cp->ibcp_queue_depth;
2557 }
d7e09d03 2558
4d99b258
LZ		 2559 write_lock_irqsave(glock, flags);
2560 /**
4420cfd3 2561 * retry connection if it's still needed and no other connection
d7e09d03
PT		 2562 * attempts (active or passive) are in progress
2563 * NB: reconnect is still needed even when ibp_tx_queue is
2564 * empty if ibp_version != version because reconnect may be
4420cfd3
JS		 2565 * initiated by kiblnd_query()
2566 */
4d99b258
LZ		 2567 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2568 peer->ibp_version != version) &&
2569 peer->ibp_connecting == 1 &&
2570 !peer->ibp_accepting;
2571 if (!reconnect) {
2572 reason = "no need";
2573 goto out;
d7e09d03
PT		 2574 }
2575
d7e09d03
PT		 2576 switch (why) {
2577 default:
2578 reason = "Unknown";
2579 break;
2580
32c8deb8
AS		 2581 case IBLND_REJECT_RDMA_FRAGS: {
2582 struct lnet_ioctl_config_lnd_tunables *tunables;
2583
4d99b258
LZ		 2584 if (!cp) {
2585 reason = "can't negotiate max frags";
2586 goto out;
2587 }
32c8deb8
AS		 2588 tunables = peer->ibp_ni->ni_lnd_tunables;
2589 if (!tunables->lt_tun_u.lt_o2ib.lnd_map_on_demand) {
4d99b258
LZ		 2590 reason = "map_on_demand must be enabled";
2591 goto out;
2592 }
2593 if (conn->ibc_max_frags <= frag_num) {
2594 reason = "unsupported max frags";
2595 goto out;
2fb44f2b
JF		 2596 }
2597
4d99b258 2598 peer->ibp_max_frags = frag_num;
2fb44f2b
JF		 2599 reason = "rdma fragments";
2600 break;
32c8deb8 2601 }
2fb44f2b 2602 case IBLND_REJECT_MSG_QUEUE_SIZE:
4d99b258
LZ		 2603 if (!cp) {
2604 reason = "can't negotiate queue depth";
2605 goto out;
2606 }
2607 if (conn->ibc_queue_depth <= queue_dep) {
2608 reason = "unsupported queue depth";
2609 goto out;
2fb44f2b
JF		 2610 }
2611
4d99b258 2612 peer->ibp_queue_depth = queue_dep;
2fb44f2b
JF		 2613 reason = "queue depth";
2614 break;
2615
d7e09d03
PT		 2616 case IBLND_REJECT_CONN_STALE:
2617 reason = "stale";
2618 break;
2619
2620 case IBLND_REJECT_CONN_RACE:
2621 reason = "conn race";
2622 break;
2623
2624 case IBLND_REJECT_CONN_UNCOMPAT:
2625 reason = "version negotiation";
2626 break;
2627 }
2628
4d99b258
LZ		 2629 conn->ibc_reconnect = 1;
2630 peer->ibp_reconnecting = 1;
2631 peer->ibp_version = version;
2632 if (incarnation)
2633 peer->ibp_incarnation = incarnation;
2634out:
2635 write_unlock_irqrestore(glock, flags);
2fb44f2b 2636
4d99b258
LZ		 2637 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2638 libcfs_nid2str(peer->ibp_nid),
2639 reconnect ? "reconnect" : "don't reconnect",
2640 reason, IBLND_MSG_VERSION, version, msg_size,
2641 conn->ibc_queue_depth, queue_dep,
2642 conn->ibc_max_frags, frag_num);
2643 /**
2644 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2645 * while destroying the zombie
2646 */
d7e09d03
PT		 2647}
2648
a8046a28 2649static void
6fe7f962 2650kiblnd_rejected(kib_conn_t *conn, int reason, void *priv, int priv_nob)
d7e09d03 2651{
ec3d17c0 2652 kib_peer_t *peer = conn->ibc_peer;
d7e09d03 2653
6fe7f962
GM		 2654 LASSERT(!in_interrupt());
2655 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
d7e09d03
PT		 2656
2657 switch (reason) {
2658 case IB_CM_REJ_STALE_CONN:
4d99b258
LZ		 2659 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2660 IBLND_REJECT_CONN_STALE, NULL);
d7e09d03
PT		 2661 break;
2662
2663 case IB_CM_REJ_INVALID_SERVICE_ID:
2664 CNETERR("%s rejected: no listener at %d\n",
2665 libcfs_nid2str(peer->ibp_nid),
2666 *kiblnd_tunables.kib_service);
2667 break;
2668
2669 case IB_CM_REJ_CONSUMER_DEFINED:
2670 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
ec3d17c0
MS		 2671 kib_rej_t *rej = priv;
2672 kib_connparams_t *cp = NULL;
2673 int flip = 0;
2674 __u64 incarnation = -1;
d7e09d03
PT		 2675
2676 /* NB. default incarnation is -1 because:
2677 * a) V1 will ignore dst incarnation in connreq.
2678 * b) V2 will provide incarnation while rejecting me,
2679 * -1 will be overwrote.
2680 *
2681 * if I try to connect to a V1 peer with V2 protocol,
2682 * it rejected me then upgrade to V2, I have no idea
2683 * about the upgrading and try to reconnect with V1,
2684 * in this case upgraded V2 can find out I'm trying to
2685 * talk to the old guy and reject me(incarnation is -1).
2686 */
2687
2688 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2689 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2690 __swab32s(&rej->ibr_magic);
2691 __swab16s(&rej->ibr_version);
2692 flip = 1;
2693 }
2694
2695 if (priv_nob >= sizeof(kib_rej_t) &&
2696 rej->ibr_version > IBLND_MSG_VERSION_1) {
4420cfd3
JS		 2697 /*
2698 * priv_nob is always 148 in current version
d7e09d03 2699 * of OFED, so we still need to check version.
4420cfd3
JS		 2700 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE)
2701 */
d7e09d03
PT		 2702 cp = &rej->ibr_cp;
2703
2704 if (flip) {
2705 __swab64s(&rej->ibr_incarnation);
2706 __swab16s(&cp->ibcp_queue_depth);
2707 __swab16s(&cp->ibcp_max_frags);
2708 __swab32s(&cp->ibcp_max_msg_size);
2709 }
2710
2711 incarnation = rej->ibr_incarnation;
2712 }
2713
2714 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2715 rej->ibr_magic != LNET_PROTO_MAGIC) {
2716 CERROR("%s rejected: consumer defined fatal error\n",
2717 libcfs_nid2str(peer->ibp_nid));
2718 break;
2719 }
2720
2721 if (rej->ibr_version != IBLND_MSG_VERSION &&
2722 rej->ibr_version != IBLND_MSG_VERSION_1) {
2723 CERROR("%s rejected: o2iblnd version %x error\n",
2724 libcfs_nid2str(peer->ibp_nid),
2725 rej->ibr_version);
2726 break;
2727 }
2728
2729 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2730 rej->ibr_version == IBLND_MSG_VERSION_1) {
2731 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2732 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2733
2734 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2735 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2736 }
2737
2738 switch (rej->ibr_why) {
2739 case IBLND_REJECT_CONN_RACE:
2740 case IBLND_REJECT_CONN_STALE:
2741 case IBLND_REJECT_CONN_UNCOMPAT:
d7e09d03 2742 case IBLND_REJECT_MSG_QUEUE_SIZE:
d7e09d03 2743 case IBLND_REJECT_RDMA_FRAGS:
4d99b258
LZ		 2744 kiblnd_check_reconnect(conn, rej->ibr_version,
2745 incarnation,
2746 rej->ibr_why, cp);
d7e09d03
PT		 2747 break;
2748
2749 case IBLND_REJECT_NO_RESOURCES:
2750 CERROR("%s rejected: o2iblnd no resources\n",
2751 libcfs_nid2str(peer->ibp_nid));
2752 break;
2753
2754 case IBLND_REJECT_FATAL:
2755 CERROR("%s rejected: o2iblnd fatal error\n",
2756 libcfs_nid2str(peer->ibp_nid));
2757 break;
2758
2759 default:
2760 CERROR("%s rejected: o2iblnd reason %d\n",
2761 libcfs_nid2str(peer->ibp_nid),
2762 rej->ibr_why);
2763 break;
2764 }
2765 break;
2766 }
2767 /* fall through */
2768 default:
2769 CNETERR("%s rejected: reason %d, size %d\n",
2770 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2771 break;
2772 }
2773
2774 kiblnd_connreq_done(conn, -ECONNREFUSED);
2775}
2776
a8046a28 2777static void
6fe7f962 2778kiblnd_check_connreply(kib_conn_t *conn, void *priv, int priv_nob)
d7e09d03 2779{
ec3d17c0
MS		 2780 kib_peer_t *peer = conn->ibc_peer;
2781 lnet_ni_t *ni = peer->ibp_ni;
2782 kib_net_t *net = ni->ni_data;
2783 kib_msg_t *msg = priv;
2784 int ver = conn->ibc_version;
2785 int rc = kiblnd_unpack_msg(msg, priv_nob);
2786 unsigned long flags;
d7e09d03 2787
06ace26e 2788 LASSERT(net);
d7e09d03 2789
5fd88337 2790 if (rc) {
d7e09d03
PT		 2791 CERROR("Can't unpack connack from %s: %d\n",
2792 libcfs_nid2str(peer->ibp_nid), rc);
2793 goto failed;
2794 }
2795
2796 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2797 CERROR("Unexpected message %d from %s\n",
2798 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2799 rc = -EPROTO;
2800 goto failed;
2801 }
2802
2803 if (ver != msg->ibm_version) {
2d00bd17 2804 CERROR("%s replied version %x is different with requested version %x\n",
d7e09d03
PT		 2805 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2806 rc = -EPROTO;
2807 goto failed;
2808 }
2809
2fb44f2b
JF		 2810 if (msg->ibm_u.connparams.ibcp_queue_depth >
2811 conn->ibc_queue_depth) {
2812 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
d7e09d03
PT		 2813 libcfs_nid2str(peer->ibp_nid),
2814 msg->ibm_u.connparams.ibcp_queue_depth,
2fb44f2b 2815 conn->ibc_queue_depth);
d7e09d03
PT		 2816 rc = -EPROTO;
2817 goto failed;
2818 }
2819
2fb44f2b
JF		 2820 if (msg->ibm_u.connparams.ibcp_max_frags >
2821 conn->ibc_max_frags) {
2822 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
d7e09d03
PT		 2823 libcfs_nid2str(peer->ibp_nid),
2824 msg->ibm_u.connparams.ibcp_max_frags,
2fb44f2b 2825 conn->ibc_max_frags);
d7e09d03
PT		 2826 rc = -EPROTO;
2827 goto failed;
2828 }
2829
2830 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2831 CERROR("%s max message size %d too big (%d max)\n",
2832 libcfs_nid2str(peer->ibp_nid),
2833 msg->ibm_u.connparams.ibcp_max_msg_size,
2834 IBLND_MSG_SIZE);
2835 rc = -EPROTO;
2836 goto failed;
2837 }
2838
2839 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2840 if (msg->ibm_dstnid == ni->ni_nid &&
2841 msg->ibm_dststamp == net->ibn_incarnation)
2842 rc = 0;
2843 else
2844 rc = -ESTALE;
2845 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2846
5fd88337 2847 if (rc) {
2d00bd17 2848 CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
d7e09d03
PT		 2849 libcfs_nid2str(peer->ibp_nid), rc,
2850 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2851 goto failed;
2852 }
2853
ec3d17c0 2854 conn->ibc_incarnation = msg->ibm_srcstamp;
2fb44f2b
JF		 2855 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2856 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2857 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2858 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2859 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2860 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
d7e09d03
PT		 2861
2862 kiblnd_connreq_done(conn, 0);
2863 return;
2864
2865 failed:
4420cfd3
JS		 2866 /*
2867 * NB My QP has already established itself, so I handle anything going
d7e09d03
PT		 2868 * wrong here by setting ibc_comms_error.
2869 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
4420cfd3
JS		 2870 * immediately tears it down.
2871 */
5fd88337 2872 LASSERT(rc);
d7e09d03
PT		 2873 conn->ibc_comms_error = rc;
2874 kiblnd_connreq_done(conn, 0);
2875}
2876
a8046a28 2877static int
6fe7f962 2878kiblnd_active_connect(struct rdma_cm_id *cmid)
d7e09d03 2879{
ec3d17c0
MS		 2880 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2881 kib_conn_t *conn;
2882 kib_msg_t *msg;
2883 struct rdma_conn_param cp;
2884 int version;
2885 __u64 incarnation;
2886 unsigned long flags;
2887 int rc;
d7e09d03
PT		 2888
2889 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2890
2891 incarnation = peer->ibp_incarnation;
5fd88337
JS		 2892 version = !peer->ibp_version ? IBLND_MSG_VERSION :
2893 peer->ibp_version;
d7e09d03
PT		 2894
2895 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2896
2fb44f2b 2897 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
a01fa108 2898 version);
06ace26e 2899 if (!conn) {
d7e09d03
PT		 2900 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2901 kiblnd_peer_decref(peer); /* lose cmid's ref */
2902 return -ENOMEM;
2903 }
2904
4420cfd3
JS		 2905 /*
2906 * conn "owns" cmid now, so I return success from here on to ensure the
d7e09d03 2907 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
4420cfd3
JS		 2908 * on peer
2909 */
d7e09d03
PT		 2910 msg = &conn->ibc_connvars->cv_msg;
2911
2912 memset(msg, 0, sizeof(*msg));
2913 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2fb44f2b
JF		 2914 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2915 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
d7e09d03
PT		 2916 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2917
2918 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2919 0, peer->ibp_nid, incarnation);
2920
2921 memset(&cp, 0, sizeof(cp));
2922 cp.private_data = msg;
2923 cp.private_data_len = msg->ibm_nob;
2924 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2925 cp.initiator_depth = 0;
ec3d17c0
MS		 2926 cp.flow_control = 1;
2927 cp.retry_count = *kiblnd_tunables.kib_retry_count;
d7e09d03
PT		 2928 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2929
2930 LASSERT(cmid->context == (void *)conn);
2931 LASSERT(conn->ibc_cmid == cmid);
2932
2933 rc = rdma_connect(cmid, &cp);
5fd88337 2934 if (rc) {
d7e09d03
PT		 2935 CERROR("Can't connect to %s: %d\n",
2936 libcfs_nid2str(peer->ibp_nid), rc);
2937 kiblnd_connreq_done(conn, rc);
2938 kiblnd_conn_decref(conn);
2939 }
2940
2941 return 0;
2942}
2943
2944int
2945kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2946{
ec3d17c0
MS		 2947 kib_peer_t *peer;
2948 kib_conn_t *conn;
2949 int rc;
d7e09d03
PT		 2950
2951 switch (event->event) {
2952 default:
2953 CERROR("Unexpected event: %d, status: %d\n",
2954 event->event, event->status);
2955 LBUG();
2956
2957 case RDMA_CM_EVENT_CONNECT_REQUEST:
2958 /* destroy cmid on failure */
2959 rc = kiblnd_passive_connect(cmid,
2960 (void *)KIBLND_CONN_PARAM(event),
2961 KIBLND_CONN_PARAM_LEN(event));
2962 CDEBUG(D_NET, "connreq: %d\n", rc);
2963 return rc;
2964
2965 case RDMA_CM_EVENT_ADDR_ERROR:
2966 peer = (kib_peer_t *)cmid->context;
2967 CNETERR("%s: ADDR ERROR %d\n",
c314c319 2968 libcfs_nid2str(peer->ibp_nid), event->status);
d7e09d03
PT		 2969 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2970 kiblnd_peer_decref(peer);
5fd88337 2971 return -EHOSTUNREACH; /* rc destroys cmid */
d7e09d03
PT		 2972
2973 case RDMA_CM_EVENT_ADDR_RESOLVED:
2974 peer = (kib_peer_t *)cmid->context;
2975
1d8cb70c 2976 CDEBUG(D_NET, "%s Addr resolved: %d\n",
d7e09d03
PT		 2977 libcfs_nid2str(peer->ibp_nid), event->status);
2978
5fd88337 2979 if (event->status) {
d7e09d03
PT		 2980 CNETERR("Can't resolve address for %s: %d\n",
2981 libcfs_nid2str(peer->ibp_nid), event->status);
2982 rc = event->status;
2983 } else {
2984 rc = rdma_resolve_route(
2985 cmid, *kiblnd_tunables.kib_timeout * 1000);
5fd88337 2986 if (!rc)
d7e09d03
PT		 2987 return 0;
2988 /* Can't initiate route resolution */
2989 CERROR("Can't resolve route for %s: %d\n",
2990 libcfs_nid2str(peer->ibp_nid), rc);
2991 }
2992 kiblnd_peer_connect_failed(peer, 1, rc);
2993 kiblnd_peer_decref(peer);
5fd88337 2994 return rc; /* rc destroys cmid */
d7e09d03
PT		 2995
2996 case RDMA_CM_EVENT_ROUTE_ERROR:
2997 peer = (kib_peer_t *)cmid->context;
2998 CNETERR("%s: ROUTE ERROR %d\n",
2999 libcfs_nid2str(peer->ibp_nid), event->status);
3000 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
3001 kiblnd_peer_decref(peer);
5fd88337 3002 return -EHOSTUNREACH; /* rc destroys cmid */
d7e09d03
PT		 3003
3004 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3005 peer = (kib_peer_t *)cmid->context;
1d8cb70c 3006 CDEBUG(D_NET, "%s Route resolved: %d\n",
d7e09d03
PT		 3007 libcfs_nid2str(peer->ibp_nid), event->status);
3008
5fd88337 3009 if (!event->status)
d7e09d03
PT		 3010 return kiblnd_active_connect(cmid);
3011
3012 CNETERR("Can't resolve route for %s: %d\n",
c314c319 3013 libcfs_nid2str(peer->ibp_nid), event->status);
d7e09d03
PT		 3014 kiblnd_peer_connect_failed(peer, 1, event->status);
3015 kiblnd_peer_decref(peer);
5fd88337 3016 return event->status; /* rc destroys cmid */
d7e09d03
PT		 3017
3018 case RDMA_CM_EVENT_UNREACHABLE:
3019 conn = (kib_conn_t *)cmid->context;
3020 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3021 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3022 CNETERR("%s: UNREACHABLE %d\n",
c314c319 3023 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
d7e09d03
PT		 3024 kiblnd_connreq_done(conn, -ENETDOWN);
3025 kiblnd_conn_decref(conn);
3026 return 0;
3027
3028 case RDMA_CM_EVENT_CONNECT_ERROR:
3029 conn = (kib_conn_t *)cmid->context;
3030 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3031 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3032 CNETERR("%s: CONNECT ERROR %d\n",
3033 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3034 kiblnd_connreq_done(conn, -ENOTCONN);
3035 kiblnd_conn_decref(conn);
3036 return 0;
3037
3038 case RDMA_CM_EVENT_REJECTED:
3039 conn = (kib_conn_t *)cmid->context;
3040 switch (conn->ibc_state) {
3041 default:
3042 LBUG();
3043
3044 case IBLND_CONN_PASSIVE_WAIT:
6fe7f962 3045 CERROR("%s: REJECTED %d\n",
c314c319
JS		 3046 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3047 event->status);
d7e09d03
PT		 3048 kiblnd_connreq_done(conn, -ECONNRESET);
3049 break;
3050
3051 case IBLND_CONN_ACTIVE_CONNECT:
3052 kiblnd_rejected(conn, event->status,
3053 (void *)KIBLND_CONN_PARAM(event),
3054 KIBLND_CONN_PARAM_LEN(event));
3055 break;
3056 }
3057 kiblnd_conn_decref(conn);
3058 return 0;
3059
3060 case RDMA_CM_EVENT_ESTABLISHED:
3061 conn = (kib_conn_t *)cmid->context;
3062 switch (conn->ibc_state) {
3063 default:
3064 LBUG();
3065
3066 case IBLND_CONN_PASSIVE_WAIT:
3067 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3068 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3069 kiblnd_connreq_done(conn, 0);
3070 break;
3071
3072 case IBLND_CONN_ACTIVE_CONNECT:
3073 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3074 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3075 kiblnd_check_connreply(conn,
3076 (void *)KIBLND_CONN_PARAM(event),
3077 KIBLND_CONN_PARAM_LEN(event));
3078 break;
3079 }
3080 /* net keeps its ref on conn! */
3081 return 0;
3082
3083 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3084 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3085 return 0;
3086 case RDMA_CM_EVENT_DISCONNECTED:
3087 conn = (kib_conn_t *)cmid->context;
3088 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3089 CERROR("%s DISCONNECTED\n",
3090 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3091 kiblnd_connreq_done(conn, -ECONNRESET);
3092 } else {
3093 kiblnd_close_conn(conn, 0);
3094 }
3095 kiblnd_conn_decref(conn);
3096 cmid->context = NULL;
3097 return 0;
3098
3099 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3100 LCONSOLE_ERROR_MSG(0x131,
3101 "Received notification of device removal\n"
3102 "Please shutdown LNET to allow this to proceed\n");
4420cfd3
JS		 3103 /*
3104 * Can't remove network from underneath LNET for now, so I have
3105 * to ignore this
3106 */
d7e09d03
PT		 3107 return 0;
3108
3109 case RDMA_CM_EVENT_ADDR_CHANGE:
3110 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3111 return 0;
3112 }
3113}
3114
3115static int
3116kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3117{
ec3d17c0
MS		 3118 kib_tx_t *tx;
3119 struct list_head *ttmp;
d7e09d03 3120
6fe7f962
GM		 3121 list_for_each(ttmp, txs) {
3122 tx = list_entry(ttmp, kib_tx_t, tx_list);
d7e09d03
PT		 3123
3124 if (txs != &conn->ibc_active_txs) {
6fe7f962 3125 LASSERT(tx->tx_queued);
d7e09d03 3126 } else {
6fe7f962 3127 LASSERT(!tx->tx_queued);
5fd88337 3128 LASSERT(tx->tx_waiting || tx->tx_sending);
d7e09d03
PT		 3129 }
3130
6fe7f962 3131 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
d7e09d03
PT		 3132 CERROR("Timed out tx: %s, %lu seconds\n",
3133 kiblnd_queue2str(conn, txs),
3134 cfs_duration_sec(jiffies - tx->tx_deadline));
3135 return 1;
3136 }
3137 }
3138
3139 return 0;
3140}
3141
3142static int
3143kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3144{
3145 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3146 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3147 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3148 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3149 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3150}
3151
a8046a28 3152static void
6fe7f962 3153kiblnd_check_conns(int idx)
d7e09d03 3154{
6fe7f962
GM		 3155 LIST_HEAD(closes);
3156 LIST_HEAD(checksends);
ec3d17c0
MS		 3157 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3158 struct list_head *ptmp;
3159 kib_peer_t *peer;
3160 kib_conn_t *conn;
995ae68c 3161 kib_conn_t *temp;
5a2ca43f 3162 kib_conn_t *tmp;
ec3d17c0
MS		 3163 struct list_head *ctmp;
3164 unsigned long flags;
d7e09d03 3165
4420cfd3
JS		 3166 /*
3167 * NB. We expect to have a look at all the peers and not find any
d7e09d03 3168 * RDMAs to time out, so we just use a shared lock while we
4420cfd3
JS		 3169 * take a look...
3170 */
d7e09d03
PT		 3171 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3172
6fe7f962
GM		 3173 list_for_each(ptmp, peers) {
3174 peer = list_entry(ptmp, kib_peer_t, ibp_list);
d7e09d03 3175
6fe7f962 3176 list_for_each(ctmp, &peer->ibp_conns) {
d7e09d03
PT		 3177 int timedout;
3178 int sendnoop;
3179
3180 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3181
6fe7f962 3182 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
d7e09d03
PT		 3183
3184 spin_lock(&conn->ibc_lock);
3185
3186 sendnoop = kiblnd_need_noop(conn);
3187 timedout = kiblnd_conn_timed_out_locked(conn);
3188 if (!sendnoop && !timedout) {
3189 spin_unlock(&conn->ibc_lock);
3190 continue;
3191 }
3192
3193 if (timedout) {
2d00bd17 3194 CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
d7e09d03
PT		 3195 libcfs_nid2str(peer->ibp_nid),
3196 cfs_duration_sec(cfs_time_current() -
3197 peer->ibp_last_alive),
3198 conn->ibc_credits,
3199 conn->ibc_outstanding_credits,
3200 conn->ibc_reserved_credits);
3201 list_add(&conn->ibc_connd_list, &closes);
3202 } else {
c314c319 3203 list_add(&conn->ibc_connd_list, &checksends);
d7e09d03
PT		 3204 }
3205 /* +ref for 'closes' or 'checksends' */
3206 kiblnd_conn_addref(conn);
3207
3208 spin_unlock(&conn->ibc_lock);
3209 }
3210 }
3211
3212 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3213
4420cfd3
JS		 3214 /*
3215 * Handle timeout by closing the whole
d7e09d03 3216 * connection. We can only be sure RDMA activity
4420cfd3
JS		 3217 * has ceased once the QP has been modified.
3218 */
5a2ca43f 3219 list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
d7e09d03
PT		 3220 list_del(&conn->ibc_connd_list);
3221 kiblnd_close_conn(conn, -ETIMEDOUT);
3222 kiblnd_conn_decref(conn);
3223 }
3224
4420cfd3
JS		 3225 /*
3226 * In case we have enough credits to return via a
d7e09d03 3227 * NOOP, but there were no non-blocking tx descs
4420cfd3
JS		 3228 * free to do it last time...
3229 */
995ae68c 3230 list_for_each_entry_safe(conn, temp, &checksends, ibc_connd_list) {
d7e09d03
PT		 3231 list_del(&conn->ibc_connd_list);
3232 kiblnd_check_sends(conn);
3233 kiblnd_conn_decref(conn);
3234 }
3235}
3236
a8046a28 3237static void
6fe7f962 3238kiblnd_disconnect_conn(kib_conn_t *conn)
d7e09d03 3239{
6fe7f962
GM		 3240 LASSERT(!in_interrupt());
3241 LASSERT(current == kiblnd_data.kib_connd);
3242 LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
d7e09d03
PT		 3243
3244 rdma_disconnect(conn->ibc_cmid);
3245 kiblnd_finalise_conn(conn);
3246
3247 kiblnd_peer_notify(conn->ibc_peer);
3248}
3249
4d99b258
LZ		 3250/**
3251 * High-water for reconnection to the same peer, reconnection attempt should
3252 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3253 */
3254#define KIB_RECONN_HIGH_RACE 10
3255/**
3256 * Allow connd to take a break and handle other things after consecutive
3257 * reconnection attemps.
3258 */
3259#define KIB_RECONN_BREAK 100
3260
d7e09d03 3261int
6fe7f962 3262kiblnd_connd(void *arg)
d7e09d03 3263{
4d99b258 3264 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
ec3d17c0
MS		 3265 wait_queue_t wait;
3266 unsigned long flags;
3267 kib_conn_t *conn;
3268 int timeout;
3269 int i;
3270 int dropped_lock;
3271 int peer_index = 0;
3272 unsigned long deadline = jiffies;
d7e09d03 3273
6fe7f962 3274 cfs_block_allsigs();
d7e09d03 3275
9e795d35 3276 init_waitqueue_entry(&wait, current);
d7e09d03
PT		 3277 kiblnd_data.kib_connd = current;
3278
4d99b258 3279 spin_lock_irqsave(lock, flags);
d7e09d03
PT		 3280
3281 while (!kiblnd_data.kib_shutdown) {
4d99b258
LZ		 3282 int reconn = 0;
3283
d7e09d03
PT		 3284 dropped_lock = 0;
3285
6fe7f962 3286 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
4d99b258
LZ		 3287 kib_peer_t *peer = NULL;
3288
66a84f8a 3289 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
c314c319 3290 kib_conn_t, ibc_list);
d7e09d03 3291 list_del(&conn->ibc_list);
4d99b258
LZ		 3292 if (conn->ibc_reconnect) {
3293 peer = conn->ibc_peer;
3294 kiblnd_peer_addref(peer);
3295 }
d7e09d03 3296
4d99b258 3297 spin_unlock_irqrestore(lock, flags);
d7e09d03
PT		 3298 dropped_lock = 1;
3299
4d99b258
LZ		 3300 kiblnd_destroy_conn(conn, !peer);
3301
3302 spin_lock_irqsave(lock, flags);
3303 if (!peer)
3304 continue;
d7e09d03 3305
4d99b258
LZ		 3306 conn->ibc_peer = peer;
3307 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3308 list_add_tail(&conn->ibc_list,
3309 &kiblnd_data.kib_reconn_list);
3310 else
3311 list_add_tail(&conn->ibc_list,
3312 &kiblnd_data.kib_reconn_wait);
d7e09d03
PT		 3313 }
3314
3315 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3316 conn = list_entry(kiblnd_data.kib_connd_conns.next,
c314c319 3317 kib_conn_t, ibc_list);
d7e09d03
PT		 3318 list_del(&conn->ibc_list);
3319
4d99b258 3320 spin_unlock_irqrestore(lock, flags);
d7e09d03
PT		 3321 dropped_lock = 1;
3322
3323 kiblnd_disconnect_conn(conn);
3324 kiblnd_conn_decref(conn);
3325
4d99b258
LZ		 3326 spin_lock_irqsave(lock, flags);
3327 }
3328
3329 while (reconn < KIB_RECONN_BREAK) {
3330 if (kiblnd_data.kib_reconn_sec !=
3331 ktime_get_real_seconds()) {
3332 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3333 list_splice_init(&kiblnd_data.kib_reconn_wait,
3334 &kiblnd_data.kib_reconn_list);
3335 }
3336
3337 if (list_empty(&kiblnd_data.kib_reconn_list))
3338 break;
3339
3340 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3341 kib_conn_t, ibc_list);
3342 list_del(&conn->ibc_list);
3343
3344 spin_unlock_irqrestore(lock, flags);
3345 dropped_lock = 1;
3346
3347 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3348 kiblnd_peer_decref(conn->ibc_peer);
3349 LIBCFS_FREE(conn, sizeof(*conn));
3350
3351 spin_lock_irqsave(lock, flags);
d7e09d03
PT		 3352 }
3353
3354 /* careful with the jiffy wrap... */
3355 timeout = (int)(deadline - jiffies);
3356 if (timeout <= 0) {
3357 const int n = 4;
3358 const int p = 1;
ec3d17c0 3359 int chunk = kiblnd_data.kib_peer_hash_size;
d7e09d03 3360
4d99b258 3361 spin_unlock_irqrestore(lock, flags);
d7e09d03
PT		 3362 dropped_lock = 1;
3363
4420cfd3
JS		 3364 /*
3365 * Time to check for RDMA timeouts on a few more
d7e09d03
PT		 3366 * peers: I do checks every 'p' seconds on a
3367 * proportion of the peer table and I need to check
3368 * every connection 'n' times within a timeout
3369 * interval, to ensure I detect a timeout on any
3370 * connection within (n+1)/n times the timeout
4420cfd3
JS		 3371 * interval.
3372 */
d7e09d03
PT		 3373 if (*kiblnd_tunables.kib_timeout > n * p)
3374 chunk = (chunk * n * p) /
3375 *kiblnd_tunables.kib_timeout;
5fd88337 3376 if (!chunk)
d7e09d03
PT		 3377 chunk = 1;
3378
3379 for (i = 0; i < chunk; i++) {
3380 kiblnd_check_conns(peer_index);
3381 peer_index = (peer_index + 1) %
3382 kiblnd_data.kib_peer_hash_size;
3383 }
3384
27d81ace 3385 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
4d99b258 3386 spin_lock_irqsave(lock, flags);
d7e09d03
PT		 3387 }
3388
3389 if (dropped_lock)
3390 continue;
3391
3392 /* Nothing to do for 'timeout' */
3393 set_current_state(TASK_INTERRUPTIBLE);
3394 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
4d99b258 3395 spin_unlock_irqrestore(lock, flags);
d7e09d03 3396
b7efb98d 3397 schedule_timeout(timeout);
d7e09d03 3398
d7e09d03 3399 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
4d99b258 3400 spin_lock_irqsave(lock, flags);
d7e09d03
PT		 3401 }
3402
4d99b258 3403 spin_unlock_irqrestore(lock, flags);
d7e09d03
PT		 3404
3405 kiblnd_thread_fini();
3406 return 0;
3407}
3408
3409void
3410kiblnd_qp_event(struct ib_event *event, void *arg)
3411{
3412 kib_conn_t *conn = arg;
3413
3414 switch (event->event) {
3415 case IB_EVENT_COMM_EST:
3416 CDEBUG(D_NET, "%s established\n",
3417 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3418 return;
3419
3420 default:
3421 CERROR("%s: Async QP event type %d\n",
3422 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3423 return;
3424 }
3425}
3426
a8046a28 3427static void
6fe7f962 3428kiblnd_complete(struct ib_wc *wc)
d7e09d03
PT		 3429{
3430 switch (kiblnd_wreqid2type(wc->wr_id)) {
3431 default:
3432 LBUG();
3433
80e05b34
DE		 3434 case IBLND_WID_MR:
3435 if (wc->status != IB_WC_SUCCESS &&
3436 wc->status != IB_WC_WR_FLUSH_ERR)
3437 CNETERR("FastReg failed: %d\n", wc->status);
3438 break;
3439
d7e09d03 3440 case IBLND_WID_RDMA:
4420cfd3
JS		 3441 /*
3442 * We only get RDMA completion notification if it fails. All
d7e09d03
PT		 3443 * subsequent work items, including the final SEND will fail
3444 * too. However we can't print out any more info about the
3445 * failing RDMA because 'tx' might be back on the idle list or
3446 * even reused already if we didn't manage to post all our work
4420cfd3
JS		 3447 * items
3448 */
d7e09d03
PT		 3449 CNETERR("RDMA (tx: %p) failed: %d\n",
3450 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3451 return;
3452
3453 case IBLND_WID_TX:
3454 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3455 return;
3456
3457 case IBLND_WID_RX:
3458 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3459 wc->byte_len);
3460 return;
3461 }
3462}
3463
3464void
3465kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3466{
4420cfd3
JS		 3467 /*
3468 * NB I'm not allowed to schedule this conn once its refcount has
d7e09d03
PT		 3469 * reached 0. Since fundamentally I'm racing with scheduler threads
3470 * consuming my CQ I could be called after all completions have
5fd88337 3471 * occurred. But in this case, !ibc_nrx && !ibc_nsends_posted
4420cfd3
JS		 3472 * and this CQ is about to be destroyed so I NOOP.
3473 */
cca32416 3474 kib_conn_t *conn = arg;
ec3d17c0
MS		 3475 struct kib_sched_info *sched = conn->ibc_sched;
3476 unsigned long flags;
d7e09d03
PT		 3477
3478 LASSERT(cq == conn->ibc_cq);
3479
3480 spin_lock_irqsave(&sched->ibs_lock, flags);
3481
3482 conn->ibc_ready = 1;
3483
3484 if (!conn->ibc_scheduled &&
3485 (conn->ibc_nrx > 0 ||
3486 conn->ibc_nsends_posted > 0)) {
3487 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3488 conn->ibc_scheduled = 1;
3489 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3490
3491 if (waitqueue_active(&sched->ibs_waitq))
3492 wake_up(&sched->ibs_waitq);
3493 }
3494
3495 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3496}
3497
3498void
3499kiblnd_cq_event(struct ib_event *event, void *arg)
3500{
3501 kib_conn_t *conn = arg;
3502
3503 CERROR("%s: async CQ event type %d\n",
3504 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3505}
3506
3507int
3508kiblnd_scheduler(void *arg)
3509{
ec3d17c0
MS		 3510 long id = (long)arg;
3511 struct kib_sched_info *sched;
3512 kib_conn_t *conn;
3513 wait_queue_t wait;
3514 unsigned long flags;
3515 struct ib_wc wc;
3516 int did_something;
3517 int busy_loops = 0;
3518 int rc;
d7e09d03
PT		 3519
3520 cfs_block_allsigs();
3521
9e795d35 3522 init_waitqueue_entry(&wait, current);
d7e09d03
PT		 3523
3524 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3525
3526 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
5fd88337 3527 if (rc) {
2d00bd17
JP		 3528 CWARN("Failed to bind on CPT %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n",
3529 sched->ibs_cpt);
d7e09d03
PT		 3530 }
3531
3532 spin_lock_irqsave(&sched->ibs_lock, flags);
3533
3534 while (!kiblnd_data.kib_shutdown) {
3535 if (busy_loops++ >= IBLND_RESCHED) {
3536 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3537
3538 cond_resched();
3539 busy_loops = 0;
3540
3541 spin_lock_irqsave(&sched->ibs_lock, flags);
3542 }
3543
3544 did_something = 0;
3545
3546 if (!list_empty(&sched->ibs_conns)) {
c314c319
JS		 3547 conn = list_entry(sched->ibs_conns.next, kib_conn_t,
3548 ibc_sched_list);
d7e09d03
PT		 3549 /* take over kib_sched_conns' ref on conn... */
3550 LASSERT(conn->ibc_scheduled);
3551 list_del(&conn->ibc_sched_list);
3552 conn->ibc_ready = 0;
3553
3554 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3555
82fffff4
LZ		 3556 wc.wr_id = IBLND_WID_INVAL;
3557
d7e09d03 3558 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
5fd88337 3559 if (!rc) {
d7e09d03
PT		 3560 rc = ib_req_notify_cq(conn->ibc_cq,
3561 IB_CQ_NEXT_COMP);
3562 if (rc < 0) {
2d00bd17 3563 CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
d7e09d03
PT		 3564 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3565 kiblnd_close_conn(conn, -EIO);
3566 kiblnd_conn_decref(conn);
3567 spin_lock_irqsave(&sched->ibs_lock,
c314c319 3568 flags);
d7e09d03
PT		 3569 continue;
3570 }
3571
3572 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3573 }
3574
82fffff4
LZ		 3575 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3576 LCONSOLE_ERROR("ib_poll_cq (rc: %d) returned invalid wr_id, opcode %d, status: %d, vendor_err: %d, conn: %s status: %d\nplease upgrade firmware and OFED or contact vendor.\n",
3577 rc, wc.opcode, wc.status,
3578 wc.vendor_err,
3579 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3580 conn->ibc_state);
3581 rc = -EINVAL;
3582 }
3583
d7e09d03 3584 if (rc < 0) {
2d00bd17 3585 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
d7e09d03
PT		 3586 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3587 rc);
3588 kiblnd_close_conn(conn, -EIO);
3589 kiblnd_conn_decref(conn);
3590 spin_lock_irqsave(&sched->ibs_lock, flags);
3591 continue;
3592 }
3593
3594 spin_lock_irqsave(&sched->ibs_lock, flags);
3595
5fd88337 3596 if (rc || conn->ibc_ready) {
4420cfd3
JS		 3597 /*
3598 * There may be another completion waiting; get
d7e09d03 3599 * another scheduler to check while I handle
4420cfd3
JS		 3600 * this one...
3601 */
d7e09d03
PT		 3602 /* +1 ref for sched_conns */
3603 kiblnd_conn_addref(conn);
3604 list_add_tail(&conn->ibc_sched_list,
c314c319 3605 &sched->ibs_conns);
d7e09d03
PT		 3606 if (waitqueue_active(&sched->ibs_waitq))
3607 wake_up(&sched->ibs_waitq);
3608 } else {
3609 conn->ibc_scheduled = 0;
3610 }
3611
5fd88337 3612 if (rc) {
d7e09d03
PT		 3613 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3614 kiblnd_complete(&wc);
3615
3616 spin_lock_irqsave(&sched->ibs_lock, flags);
3617 }
3618
3619 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3620 did_something = 1;
3621 }
3622
3623 if (did_something)
3624 continue;
3625
3626 set_current_state(TASK_INTERRUPTIBLE);
3627 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3628 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3629
b3669a7f 3630 schedule();
d7e09d03
PT		 3631 busy_loops = 0;
3632
3633 remove_wait_queue(&sched->ibs_waitq, &wait);
d7e09d03
PT		 3634 spin_lock_irqsave(&sched->ibs_lock, flags);
3635 }
3636
3637 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3638
3639 kiblnd_thread_fini();
3640 return 0;
3641}
3642
3643int
3644kiblnd_failover_thread(void *arg)
3645{
ec3d17c0
MS		 3646 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3647 kib_dev_t *dev;
3648 wait_queue_t wait;
3649 unsigned long flags;
3650 int rc;
d7e09d03 3651
5fd88337 3652 LASSERT(*kiblnd_tunables.kib_dev_failover);
d7e09d03 3653
6fe7f962 3654 cfs_block_allsigs();
d7e09d03 3655
9e795d35 3656 init_waitqueue_entry(&wait, current);
d7e09d03
PT		 3657 write_lock_irqsave(glock, flags);
3658
3659 while (!kiblnd_data.kib_shutdown) {
ec3d17c0
MS		 3660 int do_failover = 0;
3661 int long_sleep;
d7e09d03
PT		 3662
3663 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3664 ibd_fail_list) {
699503bc
GKH		 3665 if (time_before(cfs_time_current(),
3666 dev->ibd_next_failover))
d7e09d03
PT		 3667 continue;
3668 do_failover = 1;
3669 break;
3670 }
3671
3672 if (do_failover) {
3673 list_del_init(&dev->ibd_fail_list);
3674 dev->ibd_failover = 1;
3675 write_unlock_irqrestore(glock, flags);
3676
3677 rc = kiblnd_dev_failover(dev);
3678
3679 write_lock_irqsave(glock, flags);
3680
6fe7f962 3681 LASSERT(dev->ibd_failover);
d7e09d03
PT		 3682 dev->ibd_failover = 0;
3683 if (rc >= 0) { /* Device is OK or failover succeed */
3684 dev->ibd_next_failover = cfs_time_shift(3);
3685 continue;
3686 }
3687
3688 /* failed to failover, retry later */
3689 dev->ibd_next_failover =
3690 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3691 if (kiblnd_dev_can_failover(dev)) {
3692 list_add_tail(&dev->ibd_fail_list,
3693 &kiblnd_data.kib_failed_devs);
3694 }
3695
3696 continue;
3697 }
3698
3699 /* long sleep if no more pending failover */
3700 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3701
3702 set_current_state(TASK_INTERRUPTIBLE);
3703 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3704 write_unlock_irqrestore(glock, flags);
3705
3706 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3707 cfs_time_seconds(1));
d7e09d03
PT		 3708 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3709 write_lock_irqsave(glock, flags);
3710
5fd88337 3711 if (!long_sleep || rc)
d7e09d03
PT		 3712 continue;
3713
4420cfd3
JS		 3714 /*
3715 * have a long sleep, routine check all active devices,
d7e09d03
PT		 3716 * we need checking like this because if there is not active
3717 * connection on the dev and no SEND from local, we may listen
4420cfd3
JS		 3718 * on wrong HCA for ever while there is a bonding failover
3719 */
d7e09d03
PT		 3720 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3721 if (kiblnd_dev_can_failover(dev)) {
3722 list_add_tail(&dev->ibd_fail_list,
3723 &kiblnd_data.kib_failed_devs);
3724 }
3725 }
3726 }
3727
3728 write_unlock_irqrestore(glock, flags);
3729
3730 kiblnd_thread_fini();
3731 return 0;
3732}
Linux kernel - Deliverables
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