4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/klnds/o2iblnd/o2iblnd_cb.c
34 * Author: Eric Barton <eric@bartonsoftware.com>
39 #define MAX_CONN_RACES_BEFORE_ABORT 20
41 static void kiblnd_peer_alive(kib_peer_t *peer);
42 static void kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error);
43 static void kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx,
44 int type, int body_nob);
45 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
46 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
47 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
48 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
49 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
50 static void kiblnd_check_sends_locked(kib_conn_t *conn);
53 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
55 lnet_msg_t *lntmsg[2];
56 kib_net_t *net = ni->ni_data;
60 LASSERT (net != NULL);
61 LASSERT (!in_interrupt());
62 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
63 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
64 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
65 LASSERT (tx->tx_pool != NULL);
67 kiblnd_unmap_tx(ni, tx);
69 /* tx may have up to 2 lnet msgs to finalise */
70 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
71 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
74 if (tx->tx_conn != NULL) {
75 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
77 kiblnd_conn_decref(tx->tx_conn);
84 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
86 /* delay finalize until my descs have been freed */
87 for (i = 0; i < 2; i++) {
88 if (lntmsg[i] == NULL)
91 lnet_finalize(ni, lntmsg[i], rc);
96 kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
100 while (!list_empty(txlist)) {
101 tx = list_entry(txlist->next, kib_tx_t, tx_list);
103 list_del(&tx->tx_list);
106 tx->tx_status = status;
107 kiblnd_tx_done(ni, tx);
112 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
114 kib_net_t *net = (kib_net_t *)ni->ni_data;
115 struct list_head *node;
117 kib_tx_poolset_t *tps;
119 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
120 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
123 tx = container_of(node, kib_tx_t, tx_list);
125 LASSERT (tx->tx_nwrq == 0);
126 LASSERT (!tx->tx_queued);
127 LASSERT (tx->tx_sending == 0);
128 LASSERT (!tx->tx_waiting);
129 LASSERT (tx->tx_status == 0);
130 LASSERT (tx->tx_conn == NULL);
131 LASSERT (tx->tx_lntmsg[0] == NULL);
132 LASSERT (tx->tx_lntmsg[1] == NULL);
133 LASSERT (tx->tx_nfrags == 0);
139 kiblnd_drop_rx(kib_rx_t *rx)
141 kib_conn_t *conn = rx->rx_conn;
142 struct kib_sched_info *sched = conn->ibc_sched;
145 spin_lock_irqsave(&sched->ibs_lock, flags);
146 LASSERT(conn->ibc_nrx > 0);
148 spin_unlock_irqrestore(&sched->ibs_lock, flags);
150 kiblnd_conn_decref(conn);
154 kiblnd_post_rx (kib_rx_t *rx, int credit)
156 kib_conn_t *conn = rx->rx_conn;
157 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
158 struct ib_recv_wr *bad_wrq = NULL;
159 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
162 LASSERT (net != NULL);
163 LASSERT (!in_interrupt());
164 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
165 credit == IBLND_POSTRX_PEER_CREDIT ||
166 credit == IBLND_POSTRX_RSRVD_CREDIT);
169 rx->rx_sge.lkey = mr->lkey;
170 rx->rx_sge.addr = rx->rx_msgaddr;
171 rx->rx_sge.length = IBLND_MSG_SIZE;
173 rx->rx_wrq.next = NULL;
174 rx->rx_wrq.sg_list = &rx->rx_sge;
175 rx->rx_wrq.num_sge = 1;
176 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
178 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
179 LASSERT (rx->rx_nob >= 0); /* not posted */
181 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
182 kiblnd_drop_rx(rx); /* No more posts for this rx */
186 rx->rx_nob = -1; /* flag posted */
188 /* NB: need an extra reference after ib_post_recv because we don't
189 * own this rx (and rx::rx_conn) anymore, LU-5678.
191 kiblnd_conn_addref(conn);
192 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
193 if (unlikely(rc != 0)) {
194 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
195 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
199 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
202 if (unlikely(rc != 0)) {
203 kiblnd_close_conn(conn, rc);
204 kiblnd_drop_rx(rx); /* No more posts for this rx */
208 if (credit == IBLND_POSTRX_NO_CREDIT)
211 spin_lock(&conn->ibc_lock);
212 if (credit == IBLND_POSTRX_PEER_CREDIT)
213 conn->ibc_outstanding_credits++;
215 conn->ibc_reserved_credits++;
216 kiblnd_check_sends_locked(conn);
217 spin_unlock(&conn->ibc_lock);
220 kiblnd_conn_decref(conn);
225 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
227 struct list_head *tmp;
229 list_for_each(tmp, &conn->ibc_active_txs) {
230 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
232 LASSERT(!tx->tx_queued);
233 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
235 if (tx->tx_cookie != cookie)
238 if (tx->tx_waiting &&
239 tx->tx_msg->ibm_type == txtype)
242 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
243 tx->tx_waiting ? "" : "NOT ",
244 tx->tx_msg->ibm_type, txtype);
250 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
253 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
256 spin_lock(&conn->ibc_lock);
258 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
260 spin_unlock(&conn->ibc_lock);
262 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
263 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
264 kiblnd_close_conn(conn, -EPROTO);
268 if (tx->tx_status == 0) { /* success so far */
269 if (status < 0) { /* failed? */
270 tx->tx_status = status;
271 } else if (txtype == IBLND_MSG_GET_REQ) {
272 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
278 idle = !tx->tx_queued && (tx->tx_sending == 0);
280 list_del(&tx->tx_list);
282 spin_unlock(&conn->ibc_lock);
285 kiblnd_tx_done(ni, tx);
289 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
291 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
292 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
295 CERROR("Can't get tx for completion %x for %s\n",
296 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
300 tx->tx_msg->ibm_u.completion.ibcm_status = status;
301 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
302 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
304 kiblnd_queue_tx(tx, conn);
308 kiblnd_handle_rx (kib_rx_t *rx)
310 kib_msg_t *msg = rx->rx_msg;
311 kib_conn_t *conn = rx->rx_conn;
312 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
313 int credits = msg->ibm_credits;
319 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
321 CDEBUG (D_NET, "Received %x[%d] from %s\n",
322 msg->ibm_type, credits,
323 libcfs_nid2str(conn->ibc_peer->ibp_nid));
326 /* Have I received credits that will let me send? */
327 spin_lock(&conn->ibc_lock);
329 if (conn->ibc_credits + credits >
330 conn->ibc_queue_depth) {
331 rc2 = conn->ibc_credits;
332 spin_unlock(&conn->ibc_lock);
334 CERROR("Bad credits from %s: %d + %d > %d\n",
335 libcfs_nid2str(conn->ibc_peer->ibp_nid),
337 conn->ibc_queue_depth);
339 kiblnd_close_conn(conn, -EPROTO);
340 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
344 conn->ibc_credits += credits;
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++;
351 kiblnd_check_sends_locked(conn);
352 spin_unlock(&conn->ibc_lock);
355 switch (msg->ibm_type) {
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;
364 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
365 post_credit = IBLND_POSTRX_NO_CREDIT;
369 if (credits != 0) /* credit already posted */
370 post_credit = IBLND_POSTRX_NO_CREDIT;
371 else /* a keepalive NOOP */
372 post_credit = IBLND_POSTRX_PEER_CREDIT;
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;
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;
391 case IBLND_MSG_PUT_NAK:
392 CWARN ("PUT_NACK from %s\n",
393 libcfs_nid2str(conn->ibc_peer->ibp_nid));
394 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
395 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
396 msg->ibm_u.completion.ibcm_status,
397 msg->ibm_u.completion.ibcm_cookie);
400 case IBLND_MSG_PUT_ACK:
401 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
403 spin_lock(&conn->ibc_lock);
404 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
405 msg->ibm_u.putack.ibpam_src_cookie);
407 list_del(&tx->tx_list);
408 spin_unlock(&conn->ibc_lock);
411 CERROR("Unmatched PUT_ACK from %s\n",
412 libcfs_nid2str(conn->ibc_peer->ibp_nid));
417 LASSERT (tx->tx_waiting);
418 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
419 * (a) I can overwrite tx_msg since my peer has received it!
420 * (b) tx_waiting set tells tx_complete() it's not done. */
422 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
424 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
425 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
426 &msg->ibm_u.putack.ibpam_rd,
427 msg->ibm_u.putack.ibpam_dst_cookie);
429 CERROR("Can't setup rdma for PUT to %s: %d\n",
430 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
432 spin_lock(&conn->ibc_lock);
433 tx->tx_waiting = 0; /* clear waiting and queue atomically */
434 kiblnd_queue_tx_locked(tx, conn);
435 spin_unlock(&conn->ibc_lock);
438 case IBLND_MSG_PUT_DONE:
439 post_credit = IBLND_POSTRX_PEER_CREDIT;
440 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
441 msg->ibm_u.completion.ibcm_status,
442 msg->ibm_u.completion.ibcm_cookie);
445 case IBLND_MSG_GET_REQ:
446 post_credit = IBLND_POSTRX_DONT_POST;
447 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
448 msg->ibm_srcnid, rx, 1);
449 if (rc < 0) /* repost on error */
450 post_credit = IBLND_POSTRX_PEER_CREDIT;
453 case IBLND_MSG_GET_DONE:
454 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
455 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
456 msg->ibm_u.completion.ibcm_status,
457 msg->ibm_u.completion.ibcm_cookie);
461 if (rc < 0) /* protocol error */
462 kiblnd_close_conn(conn, rc);
464 if (post_credit != IBLND_POSTRX_DONT_POST)
465 kiblnd_post_rx(rx, post_credit);
469 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
471 kib_msg_t *msg = rx->rx_msg;
472 kib_conn_t *conn = rx->rx_conn;
473 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
474 kib_net_t *net = ni->ni_data;
478 LASSERT (net != NULL);
479 LASSERT (rx->rx_nob < 0); /* was posted */
480 rx->rx_nob = 0; /* isn't now */
482 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
485 if (status != IB_WC_SUCCESS) {
486 CNETERR("Rx from %s failed: %d\n",
487 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
494 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
496 CERROR ("Error %d unpacking rx from %s\n",
497 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
501 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
502 msg->ibm_dstnid != ni->ni_nid ||
503 msg->ibm_srcstamp != conn->ibc_incarnation ||
504 msg->ibm_dststamp != net->ibn_incarnation) {
505 CERROR ("Stale rx from %s\n",
506 libcfs_nid2str(conn->ibc_peer->ibp_nid));
511 /* set time last known alive */
512 kiblnd_peer_alive(conn->ibc_peer);
514 /* racing with connection establishment/teardown! */
516 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
517 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
520 write_lock_irqsave(g_lock, flags);
521 /* must check holding global lock to eliminate race */
522 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
523 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
524 write_unlock_irqrestore(g_lock, flags);
527 write_unlock_irqrestore(g_lock, flags);
529 kiblnd_handle_rx(rx);
533 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
534 kiblnd_close_conn(conn, err);
536 kiblnd_drop_rx(rx); /* Don't re-post rx. */
540 kiblnd_kvaddr_to_page (unsigned long vaddr)
544 if (is_vmalloc_addr((void *)vaddr)) {
545 page = vmalloc_to_page ((void *)vaddr);
546 LASSERT (page != NULL);
549 #ifdef CONFIG_HIGHMEM
550 if (vaddr >= PKMAP_BASE &&
551 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
552 /* No highmem pages only used for bulk (kiov) I/O */
553 CERROR("find page for address in highmem\n");
557 page = virt_to_page (vaddr);
558 LASSERT (page != NULL);
563 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, __u32 nob)
566 kib_fmr_poolset_t *fps;
570 LASSERT(tx->tx_pool != NULL);
571 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
573 hdev = tx->tx_pool->tpo_hdev;
574 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
576 fps = net->ibn_fmr_ps[cpt];
577 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->fmr);
579 CERROR("Can't map %u pages: %d\n", nob, rc);
583 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
585 rd->rd_key = tx->fmr.fmr_key;
586 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
587 rd->rd_frags[0].rf_nob = nob;
594 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
596 kib_net_t *net = ni->ni_data;
598 LASSERT(net != NULL);
600 if (net->ibn_fmr_ps != NULL)
601 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
603 if (tx->tx_nfrags != 0) {
604 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
605 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
611 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
613 kib_net_t *net = ni->ni_data;
614 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
615 struct ib_mr *mr = NULL;
619 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
621 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
622 tx->tx_nfrags = nfrags;
624 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
625 tx->tx_nfrags, tx->tx_dmadir);
627 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
628 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
629 hdev->ibh_ibdev, &tx->tx_frags[i]);
630 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
631 hdev->ibh_ibdev, &tx->tx_frags[i]);
632 nob += rd->rd_frags[i].rf_nob;
635 mr = kiblnd_find_rd_dma_mr(ni, rd,
636 (tx->tx_conn != NULL) ?
637 tx->tx_conn->ibc_max_frags : -1);
639 /* found pre-mapping MR */
640 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
644 if (net->ibn_fmr_ps != NULL)
645 return kiblnd_fmr_map_tx(net, tx, rd, nob);
652 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
653 unsigned int niov, struct kvec *iov, int offset, int nob)
655 kib_net_t *net = ni->ni_data;
657 struct scatterlist *sg;
664 LASSERT (net != NULL);
666 while (offset >= iov->iov_len) {
667 offset -= iov->iov_len;
677 vaddr = ((unsigned long)iov->iov_base) + offset;
678 page_offset = vaddr & (PAGE_SIZE - 1);
679 page = kiblnd_kvaddr_to_page(vaddr);
681 CERROR ("Can't find page\n");
685 fragnob = min((int)(iov->iov_len - offset), nob);
686 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
688 sg_set_page(sg, page, fragnob, page_offset);
691 CERROR("lacking enough sg entries to map tx\n");
695 if (offset + fragnob < iov->iov_len) {
705 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
709 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
710 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
712 kib_net_t *net = ni->ni_data;
713 struct scatterlist *sg;
716 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
720 LASSERT (net != NULL);
722 while (offset >= kiov->kiov_len) {
723 offset -= kiov->kiov_len;
733 fragnob = min((int)(kiov->kiov_len - offset), nob);
735 sg_set_page(sg, kiov->kiov_page, fragnob,
736 kiov->kiov_offset + offset);
739 CERROR("lacking enough sg entries to map tx\n");
749 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
753 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
754 __must_hold(&conn->ibc_lock)
756 kib_msg_t *msg = tx->tx_msg;
757 kib_peer_t *peer = conn->ibc_peer;
758 struct lnet_ni *ni = peer->ibp_ni;
759 int ver = conn->ibc_version;
763 LASSERT(tx->tx_queued);
764 /* We rely on this for QP sizing */
765 LASSERT(tx->tx_nwrq > 0);
766 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
768 LASSERT(credit == 0 || credit == 1);
769 LASSERT(conn->ibc_outstanding_credits >= 0);
770 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
771 LASSERT(conn->ibc_credits >= 0);
772 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
774 if (conn->ibc_nsends_posted ==
775 kiblnd_concurrent_sends(ver, ni)) {
776 /* tx completions outstanding... */
777 CDEBUG(D_NET, "%s: posted enough\n",
778 libcfs_nid2str(peer->ibp_nid));
782 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
783 CDEBUG(D_NET, "%s: no credits\n",
784 libcfs_nid2str(peer->ibp_nid));
788 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
789 conn->ibc_credits == 1 && /* last credit reserved */
790 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
791 CDEBUG(D_NET, "%s: not using last credit\n",
792 libcfs_nid2str(peer->ibp_nid));
796 /* NB don't drop ibc_lock before bumping tx_sending */
797 list_del(&tx->tx_list);
800 if (msg->ibm_type == IBLND_MSG_NOOP &&
801 (!kiblnd_need_noop(conn) || /* redundant NOOP */
802 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
803 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
804 /* OK to drop when posted enough NOOPs, since
805 * kiblnd_check_sends_locked will queue NOOP again when
806 * posted NOOPs complete */
807 spin_unlock(&conn->ibc_lock);
808 kiblnd_tx_done(peer->ibp_ni, tx);
809 spin_lock(&conn->ibc_lock);
810 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
811 libcfs_nid2str(peer->ibp_nid),
812 conn->ibc_noops_posted);
816 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
817 peer->ibp_nid, conn->ibc_incarnation);
819 conn->ibc_credits -= credit;
820 conn->ibc_outstanding_credits = 0;
821 conn->ibc_nsends_posted++;
822 if (msg->ibm_type == IBLND_MSG_NOOP)
823 conn->ibc_noops_posted++;
825 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
826 * PUT. If so, it was first queued here as a PUT_REQ, sent and
827 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
828 * and then re-queued here. It's (just) possible that
829 * tx_sending is non-zero if we've not done the tx_complete()
830 * from the first send; hence the ++ rather than = below. */
832 list_add(&tx->tx_list, &conn->ibc_active_txs);
834 /* I'm still holding ibc_lock! */
835 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
837 } else if (tx->tx_pool->tpo_pool.po_failed ||
838 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
839 /* close_conn will launch failover */
842 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
843 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
844 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
847 if (!frd->frd_valid) {
848 wr = &frd->frd_inv_wr.wr;
849 wr->next = &frd->frd_fastreg_wr.wr;
851 wr = &frd->frd_fastreg_wr.wr;
853 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
856 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
857 "bad wr_id %#llx, opc %d, flags %d, peer: %s\n",
858 bad->wr_id, bad->opcode, bad->send_flags,
859 libcfs_nid2str(conn->ibc_peer->ibp_nid));
862 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
865 conn->ibc_last_send = jiffies;
870 /* NB credits are transferred in the actual
871 * message, which can only be the last work item */
872 conn->ibc_credits += credit;
873 conn->ibc_outstanding_credits += msg->ibm_credits;
874 conn->ibc_nsends_posted--;
875 if (msg->ibm_type == IBLND_MSG_NOOP)
876 conn->ibc_noops_posted--;
882 done = (tx->tx_sending == 0);
884 list_del(&tx->tx_list);
886 spin_unlock(&conn->ibc_lock);
888 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
889 CERROR("Error %d posting transmit to %s\n",
890 rc, libcfs_nid2str(peer->ibp_nid));
892 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
893 rc, libcfs_nid2str(peer->ibp_nid));
895 kiblnd_close_conn(conn, rc);
898 kiblnd_tx_done(peer->ibp_ni, tx);
900 spin_lock(&conn->ibc_lock);
906 kiblnd_check_sends_locked(kib_conn_t *conn)
908 int ver = conn->ibc_version;
909 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
912 /* Don't send anything until after the connection is established */
913 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
914 CDEBUG(D_NET, "%s too soon\n",
915 libcfs_nid2str(conn->ibc_peer->ibp_nid));
919 LASSERT(conn->ibc_nsends_posted <=
920 kiblnd_concurrent_sends(ver, ni));
921 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
922 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
923 LASSERT (conn->ibc_reserved_credits >= 0);
925 while (conn->ibc_reserved_credits > 0 &&
926 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
927 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
929 list_del(&tx->tx_list);
930 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
931 conn->ibc_reserved_credits--;
934 if (kiblnd_need_noop(conn)) {
935 spin_unlock(&conn->ibc_lock);
937 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
939 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
941 spin_lock(&conn->ibc_lock);
943 kiblnd_queue_tx_locked(tx, conn);
949 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
951 tx = list_entry(conn->ibc_tx_queue_nocred.next,
953 } else if (!list_empty(&conn->ibc_tx_noops)) {
954 LASSERT (!IBLND_OOB_CAPABLE(ver));
956 tx = list_entry(conn->ibc_tx_noops.next,
958 } else if (!list_empty(&conn->ibc_tx_queue)) {
960 tx = list_entry(conn->ibc_tx_queue.next,
965 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
971 kiblnd_tx_complete (kib_tx_t *tx, int status)
973 int failed = (status != IB_WC_SUCCESS);
974 kib_conn_t *conn = tx->tx_conn;
977 LASSERT (tx->tx_sending > 0);
980 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
981 CNETERR("Tx -> %s cookie %#llx"
982 " sending %d waiting %d: failed %d\n",
983 libcfs_nid2str(conn->ibc_peer->ibp_nid),
984 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
987 kiblnd_close_conn(conn, -EIO);
989 kiblnd_peer_alive(conn->ibc_peer);
992 spin_lock(&conn->ibc_lock);
994 /* I could be racing with rdma completion. Whoever makes 'tx' idle
995 * gets to free it, which also drops its ref on 'conn'. */
998 conn->ibc_nsends_posted--;
999 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1000 conn->ibc_noops_posted--;
1003 tx->tx_waiting = 0; /* don't wait for peer */
1004 tx->tx_status = -EIO;
1007 idle = (tx->tx_sending == 0) && /* This is the final callback */
1008 !tx->tx_waiting && /* Not waiting for peer */
1009 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1011 list_del(&tx->tx_list);
1013 kiblnd_check_sends_locked(conn);
1014 spin_unlock(&conn->ibc_lock);
1017 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1021 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1023 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1024 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1025 struct ib_rdma_wr *wrq;
1026 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1027 struct ib_mr *mr = hdev->ibh_mrs;
1029 LASSERT(tx->tx_nwrq >= 0);
1030 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1031 LASSERT(nob <= IBLND_MSG_SIZE);
1032 LASSERT(mr != NULL);
1034 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1036 sge->lkey = mr->lkey;
1037 sge->addr = tx->tx_msgaddr;
1040 wrq = &tx->tx_wrq[tx->tx_nwrq];
1041 memset(wrq, 0, sizeof(*wrq));
1043 wrq->wr.next = NULL;
1044 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1045 wrq->wr.sg_list = sge;
1046 wrq->wr.num_sge = 1;
1047 wrq->wr.opcode = IB_WR_SEND;
1048 wrq->wr.send_flags = IB_SEND_SIGNALED;
1054 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1055 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1057 kib_msg_t *ibmsg = tx->tx_msg;
1058 kib_rdma_desc_t *srcrd = tx->tx_rd;
1059 struct ib_sge *sge = &tx->tx_sge[0];
1060 struct ib_rdma_wr *wrq;
1066 LASSERT (!in_interrupt());
1067 LASSERT (tx->tx_nwrq == 0);
1068 LASSERT (type == IBLND_MSG_GET_DONE ||
1069 type == IBLND_MSG_PUT_DONE);
1071 srcidx = dstidx = 0;
1074 if (srcidx >= srcrd->rd_nfrags) {
1075 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1080 if (dstidx == dstrd->rd_nfrags) {
1081 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1086 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1087 CERROR("RDMA has too many fragments for peer %s (%d), "
1088 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1089 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1090 conn->ibc_max_frags,
1091 srcidx, srcrd->rd_nfrags,
1092 dstidx, dstrd->rd_nfrags);
1097 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1098 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1100 sge = &tx->tx_sge[tx->tx_nwrq];
1101 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1102 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1103 sge->length = wrknob;
1105 wrq = &tx->tx_wrq[tx->tx_nwrq];
1107 wrq->wr.next = &(wrq + 1)->wr;
1108 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1109 wrq->wr.sg_list = sge;
1110 wrq->wr.num_sge = 1;
1111 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1112 wrq->wr.send_flags = 0;
1114 #ifdef HAVE_IB_RDMA_WR
1115 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1116 wrq->rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1118 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1119 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1122 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1123 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1132 if (rc < 0) /* no RDMA if completing with failure */
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,
1138 type, sizeof (kib_completion_msg_t));
1144 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1146 struct list_head *q;
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);
1153 tx->tx_deadline = jiffies +
1154 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1157 if (tx->tx_conn == NULL) {
1158 kiblnd_conn_addref(conn);
1160 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1162 /* PUT_DONE first attached to conn as a PUT_REQ */
1163 LASSERT (tx->tx_conn == conn);
1164 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1167 switch (tx->tx_msg->ibm_type) {
1171 case IBLND_MSG_PUT_REQ:
1172 case IBLND_MSG_GET_REQ:
1173 q = &conn->ibc_tx_queue_rsrvd;
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;
1183 case IBLND_MSG_NOOP:
1184 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1185 q = &conn->ibc_tx_queue_nocred;
1187 q = &conn->ibc_tx_noops;
1190 case IBLND_MSG_IMMEDIATE:
1191 q = &conn->ibc_tx_queue;
1195 list_add_tail(&tx->tx_list, q);
1199 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1201 spin_lock(&conn->ibc_lock);
1202 kiblnd_queue_tx_locked(tx, conn);
1203 kiblnd_check_sends_locked(conn);
1204 spin_unlock(&conn->ibc_lock);
1207 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1208 struct sockaddr_in *srcaddr,
1209 struct sockaddr_in *dstaddr,
1212 unsigned short port;
1215 /* allow the port to be reused */
1216 rc = rdma_set_reuseaddr(cmid, 1);
1218 CERROR("Unable to set reuse on cmid: %d\n", rc);
1222 /* look for a free privileged port */
1223 for (port = PROT_SOCK-1; port > 0; port--) {
1224 srcaddr->sin_port = htons(port);
1225 rc = rdma_resolve_addr(cmid,
1226 (struct sockaddr *)srcaddr,
1227 (struct sockaddr *)dstaddr,
1230 CDEBUG(D_NET, "bound to port %hu\n", port);
1232 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1233 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1240 CERROR("Failed to bind to a free privileged port\n");
1245 kiblnd_connect_peer (kib_peer_t *peer)
1247 struct rdma_cm_id *cmid;
1249 kib_net_t *net = peer->ibp_ni->ni_data;
1250 struct sockaddr_in srcaddr;
1251 struct sockaddr_in dstaddr;
1254 LASSERT (net != NULL);
1255 LASSERT (peer->ibp_connecting > 0);
1256 LASSERT(!peer->ibp_reconnecting);
1258 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1262 CERROR("Can't create CMID for %s: %ld\n",
1263 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1269 memset(&srcaddr, 0, sizeof(srcaddr));
1270 srcaddr.sin_family = AF_INET;
1271 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1273 memset(&dstaddr, 0, sizeof(dstaddr));
1274 dstaddr.sin_family = AF_INET;
1275 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1276 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1278 kiblnd_peer_addref(peer); /* cmid's ref */
1280 if (*kiblnd_tunables.kib_use_priv_port) {
1281 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1282 *kiblnd_tunables.kib_timeout * 1000);
1284 rc = rdma_resolve_addr(cmid,
1285 (struct sockaddr *)&srcaddr,
1286 (struct sockaddr *)&dstaddr,
1287 *kiblnd_tunables.kib_timeout * 1000);
1290 /* Can't initiate address resolution: */
1291 CERROR("Can't resolve addr for %s: %d\n",
1292 libcfs_nid2str(peer->ibp_nid), rc);
1296 LASSERT (cmid->device != NULL);
1297 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1298 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1299 &dev->ibd_ifip, cmid->device->name);
1304 kiblnd_peer_connect_failed(peer, 1, rc);
1305 kiblnd_peer_decref(peer); /* cmid's ref */
1306 rdma_destroy_id(cmid);
1309 kiblnd_peer_connect_failed(peer, 1, rc);
1313 kiblnd_reconnect_peer(kib_peer_t *peer)
1315 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1316 char *reason = NULL;
1317 struct list_head txs;
1318 unsigned long flags;
1320 INIT_LIST_HEAD(&txs);
1322 write_lock_irqsave(glock, flags);
1323 if (peer->ibp_reconnecting == 0) {
1324 if (peer->ibp_accepting)
1325 reason = "accepting";
1326 else if (peer->ibp_connecting)
1327 reason = "connecting";
1328 else if (!list_empty(&peer->ibp_conns))
1329 reason = "connected";
1330 else /* connected then closed */
1336 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1337 list_empty(&peer->ibp_conns));
1338 peer->ibp_reconnecting = 0;
1340 if (!kiblnd_peer_active(peer)) {
1341 list_splice_init(&peer->ibp_tx_queue, &txs);
1342 reason = "unlinked";
1346 peer->ibp_connecting++;
1347 peer->ibp_reconnected++;
1348 write_unlock_irqrestore(glock, flags);
1350 kiblnd_connect_peer(peer);
1354 write_unlock_irqrestore(glock, flags);
1356 CWARN("Abort reconnection of %s: %s\n",
1357 libcfs_nid2str(peer->ibp_nid), reason);
1358 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1363 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1368 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1369 unsigned long flags;
1372 /* If I get here, I've committed to send, so I complete the tx with
1373 * failure on any problems */
1375 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1376 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1378 /* First time, just use a read lock since I expect to find my peer
1380 read_lock_irqsave(g_lock, flags);
1382 peer = kiblnd_find_peer_locked(ni, nid);
1383 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1384 /* Found a peer with an established connection */
1385 conn = kiblnd_get_conn_locked(peer);
1386 kiblnd_conn_addref(conn); /* 1 ref for me... */
1388 read_unlock_irqrestore(g_lock, flags);
1391 kiblnd_queue_tx(tx, conn);
1392 kiblnd_conn_decref(conn); /* ...to here */
1396 read_unlock(g_lock);
1397 /* Re-try with a write lock */
1400 peer = kiblnd_find_peer_locked(ni, nid);
1402 if (list_empty(&peer->ibp_conns)) {
1403 /* found a peer, but it's still connecting... */
1404 LASSERT(kiblnd_peer_connecting(peer));
1406 list_add_tail(&tx->tx_list,
1407 &peer->ibp_tx_queue);
1408 write_unlock_irqrestore(g_lock, flags);
1410 conn = kiblnd_get_conn_locked(peer);
1411 kiblnd_conn_addref(conn); /* 1 ref for me... */
1413 write_unlock_irqrestore(g_lock, flags);
1416 kiblnd_queue_tx(tx, conn);
1417 kiblnd_conn_decref(conn); /* ...to here */
1422 write_unlock_irqrestore(g_lock, flags);
1424 /* Allocate a peer ready to add to the peer table and retry */
1425 rc = kiblnd_create_peer(ni, &peer, nid);
1427 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1429 tx->tx_status = -EHOSTUNREACH;
1431 kiblnd_tx_done(ni, tx);
1436 write_lock_irqsave(g_lock, flags);
1438 peer2 = kiblnd_find_peer_locked(ni, nid);
1439 if (peer2 != NULL) {
1440 if (list_empty(&peer2->ibp_conns)) {
1441 /* found a peer, but it's still connecting... */
1442 LASSERT(kiblnd_peer_connecting(peer2));
1444 list_add_tail(&tx->tx_list,
1445 &peer2->ibp_tx_queue);
1446 write_unlock_irqrestore(g_lock, flags);
1448 conn = kiblnd_get_conn_locked(peer2);
1449 kiblnd_conn_addref(conn); /* 1 ref for me... */
1451 write_unlock_irqrestore(g_lock, flags);
1454 kiblnd_queue_tx(tx, conn);
1455 kiblnd_conn_decref(conn); /* ...to here */
1458 kiblnd_peer_decref(peer);
1462 /* Brand new peer */
1463 LASSERT (peer->ibp_connecting == 0);
1464 peer->ibp_connecting = 1;
1466 /* always called with a ref on ni, which prevents ni being shutdown */
1467 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1470 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1472 kiblnd_peer_addref(peer);
1473 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1475 write_unlock_irqrestore(g_lock, flags);
1477 kiblnd_connect_peer(peer);
1478 kiblnd_peer_decref(peer);
1482 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1484 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1485 int type = lntmsg->msg_type;
1486 lnet_process_id_t target = lntmsg->msg_target;
1487 int target_is_router = lntmsg->msg_target_is_router;
1488 int routing = lntmsg->msg_routing;
1489 unsigned int payload_niov = lntmsg->msg_niov;
1490 struct kvec *payload_iov = lntmsg->msg_iov;
1491 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1492 unsigned int payload_offset = lntmsg->msg_offset;
1493 unsigned int payload_nob = lntmsg->msg_len;
1495 kib_rdma_desc_t *rd;
1500 /* NB 'private' is different depending on what we're sending.... */
1502 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1503 payload_nob, payload_niov, libcfs_id2str(target));
1505 LASSERT (payload_nob == 0 || payload_niov > 0);
1506 LASSERT (payload_niov <= LNET_MAX_IOV);
1508 /* Thread context */
1509 LASSERT (!in_interrupt());
1510 /* payload is either all vaddrs or all pages */
1511 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1519 LASSERT (payload_nob == 0);
1523 if (routing || target_is_router)
1524 break; /* send IMMEDIATE */
1526 /* is the REPLY message too small for RDMA? */
1527 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1528 if (nob <= IBLND_MSG_SIZE)
1529 break; /* send IMMEDIATE */
1531 tx = kiblnd_get_idle_tx(ni, target.nid);
1533 CERROR("Can't allocate txd for GET to %s\n",
1534 libcfs_nid2str(target.nid));
1539 rd = &ibmsg->ibm_u.get.ibgm_rd;
1540 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1541 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1542 lntmsg->msg_md->md_niov,
1543 lntmsg->msg_md->md_iov.iov,
1544 0, lntmsg->msg_md->md_length);
1546 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1547 lntmsg->msg_md->md_niov,
1548 lntmsg->msg_md->md_iov.kiov,
1549 0, lntmsg->msg_md->md_length);
1551 CERROR("Can't setup GET sink for %s: %d\n",
1552 libcfs_nid2str(target.nid), rc);
1553 kiblnd_tx_done(ni, tx);
1557 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1558 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1559 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1561 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1563 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1564 if (tx->tx_lntmsg[1] == NULL) {
1565 CERROR("Can't create reply for GET -> %s\n",
1566 libcfs_nid2str(target.nid));
1567 kiblnd_tx_done(ni, tx);
1571 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1572 tx->tx_waiting = 1; /* waiting for GET_DONE */
1573 kiblnd_launch_tx(ni, tx, target.nid);
1576 case LNET_MSG_REPLY:
1578 /* Is the payload small enough not to need RDMA? */
1579 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1580 if (nob <= IBLND_MSG_SIZE)
1581 break; /* send IMMEDIATE */
1583 tx = kiblnd_get_idle_tx(ni, target.nid);
1585 CERROR("Can't allocate %s txd for %s\n",
1586 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1587 libcfs_nid2str(target.nid));
1591 if (payload_kiov == NULL)
1592 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1593 payload_niov, payload_iov,
1594 payload_offset, payload_nob);
1596 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1597 payload_niov, payload_kiov,
1598 payload_offset, payload_nob);
1600 CERROR("Can't setup PUT src for %s: %d\n",
1601 libcfs_nid2str(target.nid), rc);
1602 kiblnd_tx_done(ni, tx);
1607 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1608 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1609 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1611 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1612 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1613 kiblnd_launch_tx(ni, tx, target.nid);
1617 /* send IMMEDIATE */
1619 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1622 tx = kiblnd_get_idle_tx(ni, target.nid);
1624 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1625 type, libcfs_nid2str(target.nid));
1630 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1632 if (payload_kiov != NULL)
1633 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1634 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1635 payload_niov, payload_kiov,
1636 payload_offset, payload_nob);
1638 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1639 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1640 payload_niov, payload_iov,
1641 payload_offset, payload_nob);
1643 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1644 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1646 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1647 kiblnd_launch_tx(ni, tx, target.nid);
1652 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1654 lnet_process_id_t target = lntmsg->msg_target;
1655 unsigned int niov = lntmsg->msg_niov;
1656 struct kvec *iov = lntmsg->msg_iov;
1657 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1658 unsigned int offset = lntmsg->msg_offset;
1659 unsigned int nob = lntmsg->msg_len;
1663 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1665 CERROR("Can't get tx for REPLY to %s\n",
1666 libcfs_nid2str(target.nid));
1672 else if (kiov == NULL)
1673 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1674 niov, iov, offset, nob);
1676 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1677 niov, kiov, offset, nob);
1680 CERROR("Can't setup GET src for %s: %d\n",
1681 libcfs_nid2str(target.nid), rc);
1685 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1686 IBLND_MSG_GET_DONE, nob,
1687 &rx->rx_msg->ibm_u.get.ibgm_rd,
1688 rx->rx_msg->ibm_u.get.ibgm_cookie);
1690 CERROR("Can't setup rdma for GET from %s: %d\n",
1691 libcfs_nid2str(target.nid), rc);
1696 /* No RDMA: local completion may happen now! */
1697 lnet_finalize(ni, lntmsg, 0);
1699 /* RDMA: lnet_finalize(lntmsg) when it
1701 tx->tx_lntmsg[0] = lntmsg;
1704 kiblnd_queue_tx(tx, rx->rx_conn);
1708 kiblnd_tx_done(ni, tx);
1710 lnet_finalize(ni, lntmsg, -EIO);
1714 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1715 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1716 unsigned int offset, unsigned int mlen, unsigned int rlen)
1718 kib_rx_t *rx = private;
1719 kib_msg_t *rxmsg = rx->rx_msg;
1720 kib_conn_t *conn = rx->rx_conn;
1723 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1726 LASSERT (mlen <= rlen);
1727 LASSERT (!in_interrupt());
1728 /* Either all pages or all vaddrs */
1729 LASSERT (!(kiov != NULL && iov != NULL));
1731 switch (rxmsg->ibm_type) {
1735 case IBLND_MSG_IMMEDIATE:
1736 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1737 if (nob > rx->rx_nob) {
1738 CERROR ("Immediate message from %s too big: %d(%d)\n",
1739 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1746 lnet_copy_flat2kiov(niov, kiov, offset,
1747 IBLND_MSG_SIZE, rxmsg,
1748 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1751 lnet_copy_flat2iov(niov, iov, offset,
1752 IBLND_MSG_SIZE, rxmsg,
1753 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1755 lnet_finalize (ni, lntmsg, 0);
1758 case IBLND_MSG_PUT_REQ: {
1760 kib_rdma_desc_t *rd;
1763 lnet_finalize(ni, lntmsg, 0);
1764 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1765 rxmsg->ibm_u.putreq.ibprm_cookie);
1769 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1771 CERROR("Can't allocate tx for %s\n",
1772 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1773 /* Not replying will break the connection */
1779 rd = &txmsg->ibm_u.putack.ibpam_rd;
1781 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1782 niov, iov, offset, mlen);
1784 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1785 niov, kiov, offset, mlen);
1787 CERROR("Can't setup PUT sink for %s: %d\n",
1788 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1789 kiblnd_tx_done(ni, tx);
1790 /* tell peer it's over */
1791 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1792 rxmsg->ibm_u.putreq.ibprm_cookie);
1796 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1797 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1798 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1800 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1802 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1803 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1804 kiblnd_queue_tx(tx, conn);
1806 /* reposted buffer reserved for PUT_DONE */
1807 post_credit = IBLND_POSTRX_NO_CREDIT;
1811 case IBLND_MSG_GET_REQ:
1812 if (lntmsg != NULL) {
1813 /* Optimized GET; RDMA lntmsg's payload */
1814 kiblnd_reply(ni, rx, lntmsg);
1816 /* GET didn't match anything */
1817 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1819 rxmsg->ibm_u.get.ibgm_cookie);
1824 kiblnd_post_rx(rx, post_credit);
1829 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1831 struct task_struct *task = kthread_run(fn, arg, name);
1834 return PTR_ERR(task);
1836 atomic_inc(&kiblnd_data.kib_nthreads);
1841 kiblnd_thread_fini (void)
1843 atomic_dec (&kiblnd_data.kib_nthreads);
1847 kiblnd_peer_alive (kib_peer_t *peer)
1849 /* This is racy, but everyone's only writing cfs_time_current() */
1850 peer->ibp_last_alive = cfs_time_current();
1855 kiblnd_peer_notify (kib_peer_t *peer)
1858 cfs_time_t last_alive = 0;
1859 unsigned long flags;
1861 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1863 if (kiblnd_peer_idle(peer) && peer->ibp_error != 0) {
1864 error = peer->ibp_error;
1865 peer->ibp_error = 0;
1867 last_alive = peer->ibp_last_alive;
1870 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1873 lnet_notify(peer->ibp_ni,
1874 peer->ibp_nid, 0, last_alive);
1878 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1880 /* This just does the immediate housekeeping. 'error' is zero for a
1881 * normal shutdown which can happen only after the connection has been
1882 * established. If the connection is established, schedule the
1883 * connection to be finished off by the connd. Otherwise the connd is
1884 * already dealing with it (either to set it up or tear it down).
1885 * Caller holds kib_global_lock exclusively in irq context */
1886 kib_peer_t *peer = conn->ibc_peer;
1888 unsigned long flags;
1890 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1892 if (error != 0 && conn->ibc_comms_error == 0)
1893 conn->ibc_comms_error = error;
1895 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1896 return; /* already being handled */
1899 list_empty(&conn->ibc_tx_noops) &&
1900 list_empty(&conn->ibc_tx_queue) &&
1901 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1902 list_empty(&conn->ibc_tx_queue_nocred) &&
1903 list_empty(&conn->ibc_active_txs)) {
1904 CDEBUG(D_NET, "closing conn to %s\n",
1905 libcfs_nid2str(peer->ibp_nid));
1907 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1908 libcfs_nid2str(peer->ibp_nid), error,
1909 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1910 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1911 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1912 "" : "(sending_rsrvd)",
1913 list_empty(&conn->ibc_tx_queue_nocred) ?
1914 "" : "(sending_nocred)",
1915 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1918 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1919 list_del(&conn->ibc_list);
1920 /* connd (see below) takes over ibc_list's ref */
1922 if (list_empty(&peer->ibp_conns) && /* no more conns */
1923 kiblnd_peer_active(peer)) { /* still in peer table */
1924 kiblnd_unlink_peer_locked(peer);
1926 /* set/clear error on last conn */
1927 peer->ibp_error = conn->ibc_comms_error;
1930 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1933 kiblnd_dev_can_failover(dev)) {
1934 list_add_tail(&dev->ibd_fail_list,
1935 &kiblnd_data.kib_failed_devs);
1936 wake_up(&kiblnd_data.kib_failover_waitq);
1939 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1941 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1942 wake_up(&kiblnd_data.kib_connd_waitq);
1944 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1948 kiblnd_close_conn(kib_conn_t *conn, int error)
1950 unsigned long flags;
1952 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1954 kiblnd_close_conn_locked(conn, error);
1956 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1960 kiblnd_handle_early_rxs(kib_conn_t *conn)
1962 unsigned long flags;
1965 LASSERT(!in_interrupt());
1966 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1968 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1969 while (!list_empty(&conn->ibc_early_rxs)) {
1970 rx = list_entry(conn->ibc_early_rxs.next,
1972 list_del(&rx->rx_list);
1973 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1975 kiblnd_handle_rx(rx);
1977 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1979 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1983 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1985 struct list_head zombies = LIST_HEAD_INIT(zombies);
1986 struct list_head *tmp;
1987 struct list_head *nxt;
1990 spin_lock(&conn->ibc_lock);
1992 list_for_each_safe(tmp, nxt, txs) {
1993 tx = list_entry(tmp, kib_tx_t, tx_list);
1995 if (txs == &conn->ibc_active_txs) {
1996 LASSERT(!tx->tx_queued);
1997 LASSERT(tx->tx_waiting ||
1998 tx->tx_sending != 0);
2000 LASSERT(tx->tx_queued);
2003 tx->tx_status = -ECONNABORTED;
2006 if (tx->tx_sending == 0) {
2008 list_del(&tx->tx_list);
2009 list_add(&tx->tx_list, &zombies);
2013 spin_unlock(&conn->ibc_lock);
2015 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2019 kiblnd_finalise_conn (kib_conn_t *conn)
2021 LASSERT (!in_interrupt());
2022 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2024 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2026 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2027 * for connections that didn't get as far as being connected, because
2028 * rdma_disconnect() does this for free. */
2029 kiblnd_abort_receives(conn);
2031 /* Complete all tx descs not waiting for sends to complete.
2032 * NB we should be safe from RDMA now that the QP has changed state */
2034 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2035 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2036 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2037 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2038 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2040 kiblnd_handle_early_rxs(conn);
2044 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2046 struct list_head zombies = LIST_HEAD_INIT(zombies);
2047 unsigned long flags;
2049 LASSERT (error != 0);
2050 LASSERT (!in_interrupt());
2052 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2055 LASSERT (peer->ibp_connecting > 0);
2056 peer->ibp_connecting--;
2058 LASSERT (peer->ibp_accepting > 0);
2059 peer->ibp_accepting--;
2062 if (kiblnd_peer_connecting(peer)) {
2063 /* another connection attempt under way... */
2064 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2069 peer->ibp_reconnected = 0;
2070 if (list_empty(&peer->ibp_conns)) {
2071 /* Take peer's blocked transmits to complete with error */
2072 list_add(&zombies, &peer->ibp_tx_queue);
2073 list_del_init(&peer->ibp_tx_queue);
2075 if (kiblnd_peer_active(peer))
2076 kiblnd_unlink_peer_locked(peer);
2078 peer->ibp_error = error;
2080 /* Can't have blocked transmits if there are connections */
2081 LASSERT(list_empty(&peer->ibp_tx_queue));
2084 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2086 kiblnd_peer_notify(peer);
2088 if (list_empty(&zombies))
2091 CNETERR("Deleting messages for %s: connection failed\n",
2092 libcfs_nid2str(peer->ibp_nid));
2094 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2098 kiblnd_connreq_done(kib_conn_t *conn, int status)
2100 kib_peer_t *peer = conn->ibc_peer;
2102 struct list_head txs;
2103 unsigned long flags;
2106 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2108 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2109 libcfs_nid2str(peer->ibp_nid), active,
2110 conn->ibc_version, status);
2112 LASSERT (!in_interrupt());
2113 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2114 peer->ibp_connecting > 0) ||
2115 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2116 peer->ibp_accepting > 0));
2118 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2119 conn->ibc_connvars = NULL;
2122 /* failed to establish connection */
2123 kiblnd_peer_connect_failed(peer, active, status);
2124 kiblnd_finalise_conn(conn);
2128 /* connection established */
2129 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2131 conn->ibc_last_send = jiffies;
2132 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2133 kiblnd_peer_alive(peer);
2135 /* Add conn to peer's list and nuke any dangling conns from a different
2136 * peer instance... */
2137 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2138 list_add(&conn->ibc_list, &peer->ibp_conns);
2139 peer->ibp_reconnected = 0;
2141 peer->ibp_connecting--;
2143 peer->ibp_accepting--;
2145 if (peer->ibp_version == 0) {
2146 peer->ibp_version = conn->ibc_version;
2147 peer->ibp_incarnation = conn->ibc_incarnation;
2150 if (peer->ibp_version != conn->ibc_version ||
2151 peer->ibp_incarnation != conn->ibc_incarnation) {
2152 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2153 conn->ibc_incarnation);
2154 peer->ibp_version = conn->ibc_version;
2155 peer->ibp_incarnation = conn->ibc_incarnation;
2158 /* grab pending txs while I have the lock */
2159 list_add(&txs, &peer->ibp_tx_queue);
2160 list_del_init(&peer->ibp_tx_queue);
2162 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2163 conn->ibc_comms_error != 0) { /* error has happened already */
2164 lnet_ni_t *ni = peer->ibp_ni;
2166 /* start to shut down connection */
2167 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2168 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2170 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2175 /* +1 ref for myself, this connection is visible to other threads
2176 * now, refcount of peer:ibp_conns can be released by connection
2177 * close from either a different thread, or the calling of
2178 * kiblnd_check_sends_locked() below. See bz21911 for details.
2180 kiblnd_conn_addref(conn);
2181 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2183 /* Schedule blocked txs */
2184 spin_lock(&conn->ibc_lock);
2185 while (!list_empty(&txs)) {
2186 tx = list_entry(txs.next, kib_tx_t, tx_list);
2187 list_del(&tx->tx_list);
2189 kiblnd_queue_tx_locked(tx, conn);
2191 kiblnd_check_sends_locked(conn);
2192 spin_unlock(&conn->ibc_lock);
2194 /* schedule blocked rxs */
2195 kiblnd_handle_early_rxs(conn);
2196 kiblnd_conn_decref(conn);
2200 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2204 rc = rdma_reject(cmid, rej, sizeof(*rej));
2207 CWARN("Error %d sending reject\n", rc);
2211 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2213 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2214 kib_msg_t *reqmsg = priv;
2220 lnet_ni_t *ni = NULL;
2221 kib_net_t *net = NULL;
2223 struct rdma_conn_param cp;
2225 int version = IBLND_MSG_VERSION;
2226 unsigned long flags;
2228 struct sockaddr_in *peer_addr;
2229 LASSERT (!in_interrupt());
2231 /* cmid inherits 'context' from the corresponding listener id */
2232 ibdev = (kib_dev_t *)cmid->context;
2233 LASSERT (ibdev != NULL);
2235 memset(&rej, 0, sizeof(rej));
2236 rej.ibr_magic = IBLND_MSG_MAGIC;
2237 rej.ibr_why = IBLND_REJECT_FATAL;
2238 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2240 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2241 if (*kiblnd_tunables.kib_require_priv_port &&
2242 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2243 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2244 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2245 &ip, ntohs(peer_addr->sin_port));
2249 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2250 CERROR("Short connection request\n");
2254 /* Future protocol version compatibility support! If the
2255 * o2iblnd-specific protocol changes, or when LNET unifies
2256 * protocols over all LNDs, the initial connection will
2257 * negotiate a protocol version. I trap this here to avoid
2258 * console errors; the reject tells the peer which protocol I
2260 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2261 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2263 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2264 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2265 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2267 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2268 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2269 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2272 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2274 CERROR("Can't parse connection request: %d\n", rc);
2278 nid = reqmsg->ibm_srcnid;
2279 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2282 net = (kib_net_t *)ni->ni_data;
2283 rej.ibr_incarnation = net->ibn_incarnation;
2286 if (ni == NULL || /* no matching net */
2287 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2288 net->ibn_dev != ibdev) { /* wrong device */
2289 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2290 "bad dst nid %s\n", libcfs_nid2str(nid),
2291 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2292 ibdev->ibd_ifname, ibdev->ibd_nnets,
2294 libcfs_nid2str(reqmsg->ibm_dstnid));
2299 /* check time stamp as soon as possible */
2300 if (reqmsg->ibm_dststamp != 0 &&
2301 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2302 CWARN("Stale connection request\n");
2303 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2307 /* I can accept peer's version */
2308 version = reqmsg->ibm_version;
2310 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2311 CERROR("Unexpected connreq msg type: %x from %s\n",
2312 reqmsg->ibm_type, libcfs_nid2str(nid));
2316 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2317 kiblnd_msg_queue_size(version, ni)) {
2318 CERROR("Can't accept conn from %s, queue depth too large: "
2319 " %d (<=%d wanted)\n",
2320 libcfs_nid2str(nid),
2321 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2322 kiblnd_msg_queue_size(version, ni));
2324 if (version == IBLND_MSG_VERSION)
2325 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2330 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2331 kiblnd_rdma_frags(version, ni)) {
2332 CWARN("Can't accept conn from %s (version %x): "
2333 "max_frags %d too large (%d wanted)\n",
2334 libcfs_nid2str(nid), version,
2335 reqmsg->ibm_u.connparams.ibcp_max_frags,
2336 kiblnd_rdma_frags(version, ni));
2338 if (version >= IBLND_MSG_VERSION)
2339 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2342 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2343 kiblnd_rdma_frags(version, ni) &&
2344 net->ibn_fmr_ps == NULL) {
2345 CWARN("Can't accept conn from %s (version %x): "
2346 "max_frags %d incompatible without FMR pool "
2348 libcfs_nid2str(nid), version,
2349 reqmsg->ibm_u.connparams.ibcp_max_frags,
2350 kiblnd_rdma_frags(version, ni));
2352 if (version == IBLND_MSG_VERSION)
2353 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2358 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2359 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2360 libcfs_nid2str(nid),
2361 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2366 /* assume 'nid' is a new peer; create */
2367 rc = kiblnd_create_peer(ni, &peer, nid);
2369 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2370 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2374 /* We have validated the peer's parameters so use those */
2375 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2376 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2378 write_lock_irqsave(g_lock, flags);
2380 peer2 = kiblnd_find_peer_locked(ni, nid);
2381 if (peer2 != NULL) {
2382 if (peer2->ibp_version == 0) {
2383 peer2->ibp_version = version;
2384 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2387 /* not the guy I've talked with */
2388 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2389 peer2->ibp_version != version) {
2390 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2392 if (kiblnd_peer_active(peer2)) {
2393 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2394 peer2->ibp_version = version;
2396 write_unlock_irqrestore(g_lock, flags);
2398 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2399 libcfs_nid2str(nid), peer2->ibp_version, version,
2400 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2402 kiblnd_peer_decref(peer);
2403 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2407 /* Tie-break connection race in favour of the higher NID.
2408 * If we keep running into a race condition multiple times,
2409 * we have to assume that the connection attempt with the
2410 * higher NID is stuck in a connecting state and will never
2411 * recover. As such, we pass through this if-block and let
2412 * the lower NID connection win so we can move forward.
2414 if (peer2->ibp_connecting != 0 &&
2415 nid < ni->ni_nid && peer2->ibp_races <
2416 MAX_CONN_RACES_BEFORE_ABORT) {
2418 write_unlock_irqrestore(g_lock, flags);
2420 CDEBUG(D_NET, "Conn race %s\n",
2421 libcfs_nid2str(peer2->ibp_nid));
2423 kiblnd_peer_decref(peer);
2424 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2427 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2428 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2429 libcfs_nid2str(peer2->ibp_nid),
2430 MAX_CONN_RACES_BEFORE_ABORT);
2432 * passive connection is allowed even this peer is waiting for
2435 peer2->ibp_reconnecting = 0;
2436 peer2->ibp_races = 0;
2437 peer2->ibp_accepting++;
2438 kiblnd_peer_addref(peer2);
2440 /* Race with kiblnd_launch_tx (active connect) to create peer
2441 * so copy validated parameters since we now know what the
2442 * peer's limits are */
2443 peer2->ibp_max_frags = peer->ibp_max_frags;
2444 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2446 write_unlock_irqrestore(g_lock, flags);
2447 kiblnd_peer_decref(peer);
2450 /* Brand new peer */
2451 LASSERT (peer->ibp_accepting == 0);
2452 LASSERT (peer->ibp_version == 0 &&
2453 peer->ibp_incarnation == 0);
2455 peer->ibp_accepting = 1;
2456 peer->ibp_version = version;
2457 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2459 /* I have a ref on ni that prevents it being shutdown */
2460 LASSERT (net->ibn_shutdown == 0);
2462 kiblnd_peer_addref(peer);
2463 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2465 write_unlock_irqrestore(g_lock, flags);
2468 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2470 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2471 kiblnd_peer_decref(peer);
2472 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2476 /* conn now "owns" cmid, so I return success from here on to ensure the
2477 * CM callback doesn't destroy cmid. */
2478 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2479 conn->ibc_credits = conn->ibc_queue_depth;
2480 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2481 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2482 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2484 ackmsg = &conn->ibc_connvars->cv_msg;
2485 memset(ackmsg, 0, sizeof(*ackmsg));
2487 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2488 sizeof(ackmsg->ibm_u.connparams));
2489 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2490 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2491 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2493 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2495 memset(&cp, 0, sizeof(cp));
2496 cp.private_data = ackmsg;
2497 cp.private_data_len = ackmsg->ibm_nob;
2498 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2499 cp.initiator_depth = 0;
2500 cp.flow_control = 1;
2501 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2502 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2504 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2506 rc = rdma_accept(cmid, &cp);
2508 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2509 rej.ibr_version = version;
2510 rej.ibr_why = IBLND_REJECT_FATAL;
2512 kiblnd_reject(cmid, &rej);
2513 kiblnd_connreq_done(conn, rc);
2514 kiblnd_conn_decref(conn);
2522 rej.ibr_cp.ibcp_queue_depth =
2523 kiblnd_msg_queue_size(version, ni);
2524 rej.ibr_cp.ibcp_max_frags = kiblnd_rdma_frags(version, ni);
2528 rej.ibr_version = version;
2529 kiblnd_reject(cmid, &rej);
2531 return -ECONNREFUSED;
2535 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2536 __u64 incarnation, int why, kib_connparams_t *cp)
2538 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2539 kib_peer_t *peer = conn->ibc_peer;
2541 int msg_size = IBLND_MSG_SIZE;
2545 unsigned long flags;
2547 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2548 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2549 LASSERT(!peer->ibp_reconnecting);
2552 msg_size = cp->ibcp_max_msg_size;
2553 frag_num = cp->ibcp_max_frags;
2554 queue_dep = cp->ibcp_queue_depth;
2557 write_lock_irqsave(glock, flags);
2558 /* retry connection if it's still needed and no other connection
2559 * attempts (active or passive) are in progress
2560 * NB: reconnect is still needed even when ibp_tx_queue is
2561 * empty if ibp_version != version because reconnect may be
2562 * initiated by kiblnd_query() */
2563 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2564 peer->ibp_version != version) &&
2565 peer->ibp_connecting == 1 &&
2566 peer->ibp_accepting == 0;
2577 case IBLND_REJECT_RDMA_FRAGS: {
2578 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2581 reason = "can't negotiate max frags";
2584 tunables = &peer->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2585 if (!tunables->lnd_map_on_demand) {
2586 reason = "map_on_demand must be enabled";
2589 if (conn->ibc_max_frags <= frag_num) {
2590 reason = "unsupported max frags";
2594 peer->ibp_max_frags = frag_num;
2595 reason = "rdma fragments";
2598 case IBLND_REJECT_MSG_QUEUE_SIZE:
2600 reason = "can't negotiate queue depth";
2603 if (conn->ibc_queue_depth <= queue_dep) {
2604 reason = "unsupported queue depth";
2608 peer->ibp_queue_depth = queue_dep;
2609 reason = "queue depth";
2612 case IBLND_REJECT_CONN_STALE:
2616 case IBLND_REJECT_CONN_RACE:
2617 reason = "conn race";
2620 case IBLND_REJECT_CONN_UNCOMPAT:
2621 reason = "version negotiation";
2625 conn->ibc_reconnect = 1;
2626 peer->ibp_reconnecting = 1;
2627 peer->ibp_version = version;
2628 if (incarnation != 0)
2629 peer->ibp_incarnation = incarnation;
2631 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2633 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2634 libcfs_nid2str(peer->ibp_nid),
2635 reconnect ? "reconnect" : "don't reconnect",
2636 reason, IBLND_MSG_VERSION, version, msg_size,
2637 conn->ibc_queue_depth, queue_dep,
2638 conn->ibc_max_frags, frag_num);
2640 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2641 * while destroying the zombie
2646 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2648 kib_peer_t *peer = conn->ibc_peer;
2650 LASSERT (!in_interrupt());
2651 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2654 case IB_CM_REJ_STALE_CONN:
2655 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2656 IBLND_REJECT_CONN_STALE, NULL);
2659 case IB_CM_REJ_INVALID_SERVICE_ID:
2660 CNETERR("%s rejected: no listener at %d\n",
2661 libcfs_nid2str(peer->ibp_nid),
2662 *kiblnd_tunables.kib_service);
2665 case IB_CM_REJ_CONSUMER_DEFINED:
2666 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2667 kib_rej_t *rej = priv;
2668 kib_connparams_t *cp = NULL;
2670 __u64 incarnation = -1;
2672 /* NB. default incarnation is -1 because:
2673 * a) V1 will ignore dst incarnation in connreq.
2674 * b) V2 will provide incarnation while rejecting me,
2675 * -1 will be overwrote.
2677 * if I try to connect to a V1 peer with V2 protocol,
2678 * it rejected me then upgrade to V2, I have no idea
2679 * about the upgrading and try to reconnect with V1,
2680 * in this case upgraded V2 can find out I'm trying to
2681 * talk to the old guy and reject me(incarnation is -1).
2684 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2685 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2686 __swab32s(&rej->ibr_magic);
2687 __swab16s(&rej->ibr_version);
2691 if (priv_nob >= sizeof(kib_rej_t) &&
2692 rej->ibr_version > IBLND_MSG_VERSION_1) {
2693 /* priv_nob is always 148 in current version
2694 * of OFED, so we still need to check version.
2695 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2699 __swab64s(&rej->ibr_incarnation);
2700 __swab16s(&cp->ibcp_queue_depth);
2701 __swab16s(&cp->ibcp_max_frags);
2702 __swab32s(&cp->ibcp_max_msg_size);
2705 incarnation = rej->ibr_incarnation;
2708 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2709 rej->ibr_magic != LNET_PROTO_MAGIC) {
2710 CERROR("%s rejected: consumer defined fatal error\n",
2711 libcfs_nid2str(peer->ibp_nid));
2715 if (rej->ibr_version != IBLND_MSG_VERSION &&
2716 rej->ibr_version != IBLND_MSG_VERSION_1) {
2717 CERROR("%s rejected: o2iblnd version %x error\n",
2718 libcfs_nid2str(peer->ibp_nid),
2723 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2724 rej->ibr_version == IBLND_MSG_VERSION_1) {
2725 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2726 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2728 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2729 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2732 switch (rej->ibr_why) {
2733 case IBLND_REJECT_CONN_RACE:
2734 case IBLND_REJECT_CONN_STALE:
2735 case IBLND_REJECT_CONN_UNCOMPAT:
2736 case IBLND_REJECT_MSG_QUEUE_SIZE:
2737 case IBLND_REJECT_RDMA_FRAGS:
2738 kiblnd_check_reconnect(conn, rej->ibr_version,
2739 incarnation, rej->ibr_why, cp);
2742 case IBLND_REJECT_NO_RESOURCES:
2743 CERROR("%s rejected: o2iblnd no resources\n",
2744 libcfs_nid2str(peer->ibp_nid));
2747 case IBLND_REJECT_FATAL:
2748 CERROR("%s rejected: o2iblnd fatal error\n",
2749 libcfs_nid2str(peer->ibp_nid));
2753 CERROR("%s rejected: o2iblnd reason %d\n",
2754 libcfs_nid2str(peer->ibp_nid),
2762 CNETERR("%s rejected: reason %d, size %d\n",
2763 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2767 kiblnd_connreq_done(conn, -ECONNREFUSED);
2771 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2773 kib_peer_t *peer = conn->ibc_peer;
2774 lnet_ni_t *ni = peer->ibp_ni;
2775 kib_net_t *net = ni->ni_data;
2776 kib_msg_t *msg = priv;
2777 int ver = conn->ibc_version;
2778 int rc = kiblnd_unpack_msg(msg, priv_nob);
2779 unsigned long flags;
2781 LASSERT (net != NULL);
2784 CERROR("Can't unpack connack from %s: %d\n",
2785 libcfs_nid2str(peer->ibp_nid), rc);
2789 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2790 CERROR("Unexpected message %d from %s\n",
2791 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2796 if (ver != msg->ibm_version) {
2797 CERROR("%s replied version %x is different with "
2798 "requested version %x\n",
2799 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2804 if (msg->ibm_u.connparams.ibcp_queue_depth >
2805 conn->ibc_queue_depth) {
2806 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2807 libcfs_nid2str(peer->ibp_nid),
2808 msg->ibm_u.connparams.ibcp_queue_depth,
2809 conn->ibc_queue_depth);
2814 if (msg->ibm_u.connparams.ibcp_max_frags >
2815 conn->ibc_max_frags) {
2816 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2817 libcfs_nid2str(peer->ibp_nid),
2818 msg->ibm_u.connparams.ibcp_max_frags,
2819 conn->ibc_max_frags);
2824 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2825 CERROR("%s max message size %d too big (%d max)\n",
2826 libcfs_nid2str(peer->ibp_nid),
2827 msg->ibm_u.connparams.ibcp_max_msg_size,
2833 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2834 if (msg->ibm_dstnid == ni->ni_nid &&
2835 msg->ibm_dststamp == net->ibn_incarnation)
2839 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2842 CERROR("Bad connection reply from %s, rc = %d, "
2843 "version: %x max_frags: %d\n",
2844 libcfs_nid2str(peer->ibp_nid), rc,
2845 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2849 conn->ibc_incarnation = msg->ibm_srcstamp;
2850 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2851 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2852 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2853 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2854 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2855 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2857 kiblnd_connreq_done(conn, 0);
2861 /* NB My QP has already established itself, so I handle anything going
2862 * wrong here by setting ibc_comms_error.
2863 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2864 * immediately tears it down. */
2867 conn->ibc_comms_error = rc;
2868 kiblnd_connreq_done(conn, 0);
2872 kiblnd_active_connect (struct rdma_cm_id *cmid)
2874 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2877 struct rdma_conn_param cp;
2880 unsigned long flags;
2883 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2885 incarnation = peer->ibp_incarnation;
2886 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2889 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2891 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2894 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2895 kiblnd_peer_decref(peer); /* lose cmid's ref */
2899 /* conn "owns" cmid now, so I return success from here on to ensure the
2900 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2903 msg = &conn->ibc_connvars->cv_msg;
2905 memset(msg, 0, sizeof(*msg));
2906 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2907 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2908 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2909 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2911 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2912 0, peer->ibp_nid, incarnation);
2914 memset(&cp, 0, sizeof(cp));
2915 cp.private_data = msg;
2916 cp.private_data_len = msg->ibm_nob;
2917 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2918 cp.initiator_depth = 0;
2919 cp.flow_control = 1;
2920 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2921 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2923 LASSERT(cmid->context == (void *)conn);
2924 LASSERT(conn->ibc_cmid == cmid);
2926 rc = rdma_connect(cmid, &cp);
2928 CERROR("Can't connect to %s: %d\n",
2929 libcfs_nid2str(peer->ibp_nid), rc);
2930 kiblnd_connreq_done(conn, rc);
2931 kiblnd_conn_decref(conn);
2938 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2944 switch (event->event) {
2946 CERROR("Unexpected event: %d, status: %d\n",
2947 event->event, event->status);
2950 case RDMA_CM_EVENT_CONNECT_REQUEST:
2951 /* destroy cmid on failure */
2952 rc = kiblnd_passive_connect(cmid,
2953 (void *)KIBLND_CONN_PARAM(event),
2954 KIBLND_CONN_PARAM_LEN(event));
2955 CDEBUG(D_NET, "connreq: %d\n", rc);
2958 case RDMA_CM_EVENT_ADDR_ERROR:
2959 peer = (kib_peer_t *)cmid->context;
2960 CNETERR("%s: ADDR ERROR %d\n",
2961 libcfs_nid2str(peer->ibp_nid), event->status);
2962 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2963 kiblnd_peer_decref(peer);
2964 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2966 case RDMA_CM_EVENT_ADDR_RESOLVED:
2967 peer = (kib_peer_t *)cmid->context;
2969 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2970 libcfs_nid2str(peer->ibp_nid), event->status);
2972 if (event->status != 0) {
2973 CNETERR("Can't resolve address for %s: %d\n",
2974 libcfs_nid2str(peer->ibp_nid), event->status);
2977 rc = rdma_resolve_route(
2978 cmid, *kiblnd_tunables.kib_timeout * 1000);
2981 /* Can't initiate route resolution */
2982 CERROR("Can't resolve route for %s: %d\n",
2983 libcfs_nid2str(peer->ibp_nid), rc);
2985 kiblnd_peer_connect_failed(peer, 1, rc);
2986 kiblnd_peer_decref(peer);
2987 return rc; /* rc != 0 destroys cmid */
2989 case RDMA_CM_EVENT_ROUTE_ERROR:
2990 peer = (kib_peer_t *)cmid->context;
2991 CNETERR("%s: ROUTE ERROR %d\n",
2992 libcfs_nid2str(peer->ibp_nid), event->status);
2993 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2994 kiblnd_peer_decref(peer);
2995 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2997 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2998 peer = (kib_peer_t *)cmid->context;
2999 CDEBUG(D_NET,"%s Route resolved: %d\n",
3000 libcfs_nid2str(peer->ibp_nid), event->status);
3002 if (event->status == 0)
3003 return kiblnd_active_connect(cmid);
3005 CNETERR("Can't resolve route for %s: %d\n",
3006 libcfs_nid2str(peer->ibp_nid), event->status);
3007 kiblnd_peer_connect_failed(peer, 1, event->status);
3008 kiblnd_peer_decref(peer);
3009 return event->status; /* rc != 0 destroys cmid */
3011 case RDMA_CM_EVENT_UNREACHABLE:
3012 conn = (kib_conn_t *)cmid->context;
3013 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3014 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3015 CNETERR("%s: UNREACHABLE %d\n",
3016 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3017 kiblnd_connreq_done(conn, -ENETDOWN);
3018 kiblnd_conn_decref(conn);
3021 case RDMA_CM_EVENT_CONNECT_ERROR:
3022 conn = (kib_conn_t *)cmid->context;
3023 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3024 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3025 CNETERR("%s: CONNECT ERROR %d\n",
3026 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3027 kiblnd_connreq_done(conn, -ENOTCONN);
3028 kiblnd_conn_decref(conn);
3031 case RDMA_CM_EVENT_REJECTED:
3032 conn = (kib_conn_t *)cmid->context;
3033 switch (conn->ibc_state) {
3037 case IBLND_CONN_PASSIVE_WAIT:
3038 CERROR ("%s: REJECTED %d\n",
3039 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3041 kiblnd_connreq_done(conn, -ECONNRESET);
3044 case IBLND_CONN_ACTIVE_CONNECT:
3045 kiblnd_rejected(conn, event->status,
3046 (void *)KIBLND_CONN_PARAM(event),
3047 KIBLND_CONN_PARAM_LEN(event));
3050 kiblnd_conn_decref(conn);
3053 case RDMA_CM_EVENT_ESTABLISHED:
3054 conn = (kib_conn_t *)cmid->context;
3055 switch (conn->ibc_state) {
3059 case IBLND_CONN_PASSIVE_WAIT:
3060 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3061 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3062 kiblnd_connreq_done(conn, 0);
3065 case IBLND_CONN_ACTIVE_CONNECT:
3066 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3067 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3068 kiblnd_check_connreply(conn,
3069 (void *)KIBLND_CONN_PARAM(event),
3070 KIBLND_CONN_PARAM_LEN(event));
3073 /* net keeps its ref on conn! */
3076 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3077 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3080 case RDMA_CM_EVENT_DISCONNECTED:
3081 conn = (kib_conn_t *)cmid->context;
3082 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3083 CERROR("%s DISCONNECTED\n",
3084 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3085 kiblnd_connreq_done(conn, -ECONNRESET);
3087 kiblnd_close_conn(conn, 0);
3089 kiblnd_conn_decref(conn);
3090 cmid->context = NULL;
3093 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3094 LCONSOLE_ERROR_MSG(0x131,
3095 "Received notification of device removal\n"
3096 "Please shutdown LNET to allow this to proceed\n");
3097 /* Can't remove network from underneath LNET for now, so I have
3101 case RDMA_CM_EVENT_ADDR_CHANGE:
3102 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3108 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3111 struct list_head *ttmp;
3113 list_for_each(ttmp, txs) {
3114 tx = list_entry(ttmp, kib_tx_t, tx_list);
3116 if (txs != &conn->ibc_active_txs) {
3117 LASSERT(tx->tx_queued);
3119 LASSERT(!tx->tx_queued);
3120 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3123 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3124 CERROR("Timed out tx: %s, %lu seconds\n",
3125 kiblnd_queue2str(conn, txs),
3126 cfs_duration_sec(jiffies - tx->tx_deadline));
3135 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3137 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3138 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3139 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3140 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3141 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3145 kiblnd_check_conns (int idx)
3147 struct list_head closes = LIST_HEAD_INIT(closes);
3148 struct list_head checksends = LIST_HEAD_INIT(checksends);
3149 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3150 struct list_head *ptmp;
3153 struct list_head *ctmp;
3154 unsigned long flags;
3156 /* NB. We expect to have a look at all the peers and not find any
3157 * RDMAs to time out, so we just use a shared lock while we
3159 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3161 list_for_each(ptmp, peers) {
3162 peer = list_entry(ptmp, kib_peer_t, ibp_list);
3164 list_for_each(ctmp, &peer->ibp_conns) {
3168 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3170 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3172 spin_lock(&conn->ibc_lock);
3174 sendnoop = kiblnd_need_noop(conn);
3175 timedout = kiblnd_conn_timed_out_locked(conn);
3176 if (!sendnoop && !timedout) {
3177 spin_unlock(&conn->ibc_lock);
3182 CERROR("Timed out RDMA with %s (%lu): "
3183 "c: %u, oc: %u, rc: %u\n",
3184 libcfs_nid2str(peer->ibp_nid),
3185 cfs_duration_sec(cfs_time_current() -
3186 peer->ibp_last_alive),
3188 conn->ibc_outstanding_credits,
3189 conn->ibc_reserved_credits);
3190 list_add(&conn->ibc_connd_list, &closes);
3192 list_add(&conn->ibc_connd_list, &checksends);
3194 /* +ref for 'closes' or 'checksends' */
3195 kiblnd_conn_addref(conn);
3197 spin_unlock(&conn->ibc_lock);
3201 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3203 /* Handle timeout by closing the whole
3204 * connection. We can only be sure RDMA activity
3205 * has ceased once the QP has been modified. */
3206 while (!list_empty(&closes)) {
3207 conn = list_entry(closes.next,
3208 kib_conn_t, ibc_connd_list);
3209 list_del(&conn->ibc_connd_list);
3210 kiblnd_close_conn(conn, -ETIMEDOUT);
3211 kiblnd_conn_decref(conn);
3214 /* In case we have enough credits to return via a
3215 * NOOP, but there were no non-blocking tx descs
3216 * free to do it last time... */
3217 while (!list_empty(&checksends)) {
3218 conn = list_entry(checksends.next,
3219 kib_conn_t, ibc_connd_list);
3220 list_del(&conn->ibc_connd_list);
3222 spin_lock(&conn->ibc_lock);
3223 kiblnd_check_sends_locked(conn);
3224 spin_unlock(&conn->ibc_lock);
3226 kiblnd_conn_decref(conn);
3231 kiblnd_disconnect_conn (kib_conn_t *conn)
3233 LASSERT (!in_interrupt());
3234 LASSERT (current == kiblnd_data.kib_connd);
3235 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3237 rdma_disconnect(conn->ibc_cmid);
3238 kiblnd_finalise_conn(conn);
3240 kiblnd_peer_notify(conn->ibc_peer);
3244 * High-water for reconnection to the same peer, reconnection attempt should
3245 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3247 #define KIB_RECONN_HIGH_RACE 10
3249 * Allow connd to take a break and handle other things after consecutive
3250 * reconnection attemps.
3252 #define KIB_RECONN_BREAK 100
3255 kiblnd_connd (void *arg)
3257 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3259 unsigned long flags;
3265 unsigned long deadline = jiffies;
3267 cfs_block_allsigs();
3269 init_waitqueue_entry(&wait, current);
3270 kiblnd_data.kib_connd = current;
3272 spin_lock_irqsave(lock, flags);
3274 while (!kiblnd_data.kib_shutdown) {
3279 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3280 kib_peer_t *peer = NULL;
3282 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3283 kib_conn_t, ibc_list);
3284 list_del(&conn->ibc_list);
3285 if (conn->ibc_reconnect) {
3286 peer = conn->ibc_peer;
3287 kiblnd_peer_addref(peer);
3290 spin_unlock_irqrestore(lock, flags);
3293 kiblnd_destroy_conn(conn, !peer);
3295 spin_lock_irqsave(lock, flags);
3299 conn->ibc_peer = peer;
3300 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3301 list_add_tail(&conn->ibc_list,
3302 &kiblnd_data.kib_reconn_list);
3304 list_add_tail(&conn->ibc_list,
3305 &kiblnd_data.kib_reconn_wait);
3308 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3309 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3310 kib_conn_t, ibc_list);
3311 list_del(&conn->ibc_list);
3313 spin_unlock_irqrestore(lock, flags);
3316 kiblnd_disconnect_conn(conn);
3317 kiblnd_conn_decref(conn);
3319 spin_lock_irqsave(lock, flags);
3322 while (reconn < KIB_RECONN_BREAK) {
3323 if (kiblnd_data.kib_reconn_sec !=
3324 ktime_get_real_seconds()) {
3325 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3326 list_splice_init(&kiblnd_data.kib_reconn_wait,
3327 &kiblnd_data.kib_reconn_list);
3330 if (list_empty(&kiblnd_data.kib_reconn_list))
3333 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3334 kib_conn_t, ibc_list);
3335 list_del(&conn->ibc_list);
3337 spin_unlock_irqrestore(lock, flags);
3340 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3341 kiblnd_peer_decref(conn->ibc_peer);
3342 LIBCFS_FREE(conn, sizeof(*conn));
3344 spin_lock_irqsave(lock, flags);
3347 /* careful with the jiffy wrap... */
3348 timeout = (int)(deadline - jiffies);
3352 int chunk = kiblnd_data.kib_peer_hash_size;
3354 spin_unlock_irqrestore(lock, flags);
3357 /* Time to check for RDMA timeouts on a few more
3358 * peers: I do checks every 'p' seconds on a
3359 * proportion of the peer table and I need to check
3360 * every connection 'n' times within a timeout
3361 * interval, to ensure I detect a timeout on any
3362 * connection within (n+1)/n times the timeout
3365 if (*kiblnd_tunables.kib_timeout > n * p)
3366 chunk = (chunk * n * p) /
3367 *kiblnd_tunables.kib_timeout;
3371 for (i = 0; i < chunk; i++) {
3372 kiblnd_check_conns(peer_index);
3373 peer_index = (peer_index + 1) %
3374 kiblnd_data.kib_peer_hash_size;
3377 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3378 spin_lock_irqsave(lock, flags);
3384 /* Nothing to do for 'timeout' */
3385 set_current_state(TASK_INTERRUPTIBLE);
3386 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3387 spin_unlock_irqrestore(lock, flags);
3389 schedule_timeout(timeout);
3391 set_current_state(TASK_RUNNING);
3392 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3393 spin_lock_irqsave(lock, flags);
3396 spin_unlock_irqrestore(lock, flags);
3398 kiblnd_thread_fini();
3403 kiblnd_qp_event(struct ib_event *event, void *arg)
3405 kib_conn_t *conn = arg;
3407 switch (event->event) {
3408 case IB_EVENT_COMM_EST:
3409 CDEBUG(D_NET, "%s established\n",
3410 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3411 /* We received a packet but connection isn't established
3412 * probably handshake packet was lost, so free to
3413 * force make connection established */
3414 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3418 CERROR("%s: Async QP event type %d\n",
3419 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3425 kiblnd_complete (struct ib_wc *wc)
3427 switch (kiblnd_wreqid2type(wc->wr_id)) {
3432 if (wc->status != IB_WC_SUCCESS &&
3433 wc->status != IB_WC_WR_FLUSH_ERR)
3434 CNETERR("FastReg failed: %d\n", wc->status);
3437 case IBLND_WID_RDMA:
3438 /* We only get RDMA completion notification if it fails. All
3439 * subsequent work items, including the final SEND will fail
3440 * too. However we can't print out any more info about the
3441 * failing RDMA because 'tx' might be back on the idle list or
3442 * even reused already if we didn't manage to post all our work
3444 CNETERR("RDMA (tx: %p) failed: %d\n",
3445 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3449 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3453 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3460 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3462 /* NB I'm not allowed to schedule this conn once its refcount has
3463 * reached 0. Since fundamentally I'm racing with scheduler threads
3464 * consuming my CQ I could be called after all completions have
3465 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3466 * and this CQ is about to be destroyed so I NOOP. */
3467 kib_conn_t *conn = (kib_conn_t *)arg;
3468 struct kib_sched_info *sched = conn->ibc_sched;
3469 unsigned long flags;
3471 LASSERT(cq == conn->ibc_cq);
3473 spin_lock_irqsave(&sched->ibs_lock, flags);
3475 conn->ibc_ready = 1;
3477 if (!conn->ibc_scheduled &&
3478 (conn->ibc_nrx > 0 ||
3479 conn->ibc_nsends_posted > 0)) {
3480 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3481 conn->ibc_scheduled = 1;
3482 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3484 if (waitqueue_active(&sched->ibs_waitq))
3485 wake_up(&sched->ibs_waitq);
3488 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3492 kiblnd_cq_event(struct ib_event *event, void *arg)
3494 kib_conn_t *conn = arg;
3496 CERROR("%s: async CQ event type %d\n",
3497 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3501 kiblnd_scheduler(void *arg)
3503 long id = (long)arg;
3504 struct kib_sched_info *sched;
3507 unsigned long flags;
3513 cfs_block_allsigs();
3515 init_waitqueue_entry(&wait, current);
3517 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3519 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3521 CWARN("Unable to bind on CPU partition %d, please verify "
3522 "whether all CPUs are healthy and reload modules if "
3523 "necessary, otherwise your system might under risk of "
3524 "low performance\n", sched->ibs_cpt);
3527 spin_lock_irqsave(&sched->ibs_lock, flags);
3529 while (!kiblnd_data.kib_shutdown) {
3530 if (busy_loops++ >= IBLND_RESCHED) {
3531 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3536 spin_lock_irqsave(&sched->ibs_lock, flags);
3541 if (!list_empty(&sched->ibs_conns)) {
3542 conn = list_entry(sched->ibs_conns.next,
3543 kib_conn_t, ibc_sched_list);
3544 /* take over kib_sched_conns' ref on conn... */
3545 LASSERT(conn->ibc_scheduled);
3546 list_del(&conn->ibc_sched_list);
3547 conn->ibc_ready = 0;
3549 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3551 wc.wr_id = IBLND_WID_INVAL;
3553 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3555 rc = ib_req_notify_cq(conn->ibc_cq,
3558 CWARN("%s: ib_req_notify_cq failed: %d, "
3559 "closing connection\n",
3560 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3561 kiblnd_close_conn(conn, -EIO);
3562 kiblnd_conn_decref(conn);
3563 spin_lock_irqsave(&sched->ibs_lock,
3568 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3571 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3573 "ib_poll_cq (rc: %d) returned invalid "
3574 "wr_id, opcode %d, status: %d, "
3575 "vendor_err: %d, conn: %s status: %d\n"
3576 "please upgrade firmware and OFED or "
3577 "contact vendor.\n", rc,
3578 wc.opcode, wc.status, wc.vendor_err,
3579 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3585 CWARN("%s: ib_poll_cq failed: %d, "
3586 "closing connection\n",
3587 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3589 kiblnd_close_conn(conn, -EIO);
3590 kiblnd_conn_decref(conn);
3591 spin_lock_irqsave(&sched->ibs_lock, flags);
3595 spin_lock_irqsave(&sched->ibs_lock, flags);
3597 if (rc != 0 || conn->ibc_ready) {
3598 /* There may be another completion waiting; get
3599 * another scheduler to check while I handle
3601 /* +1 ref for sched_conns */
3602 kiblnd_conn_addref(conn);
3603 list_add_tail(&conn->ibc_sched_list,
3605 if (waitqueue_active(&sched->ibs_waitq))
3606 wake_up(&sched->ibs_waitq);
3608 conn->ibc_scheduled = 0;
3612 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3613 kiblnd_complete(&wc);
3615 spin_lock_irqsave(&sched->ibs_lock, flags);
3618 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3625 set_current_state(TASK_INTERRUPTIBLE);
3626 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3627 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3632 remove_wait_queue(&sched->ibs_waitq, &wait);
3633 set_current_state(TASK_RUNNING);
3634 spin_lock_irqsave(&sched->ibs_lock, flags);
3637 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3639 kiblnd_thread_fini();
3644 kiblnd_failover_thread(void *arg)
3646 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3649 unsigned long flags;
3652 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3654 cfs_block_allsigs();
3656 init_waitqueue_entry(&wait, current);
3657 write_lock_irqsave(glock, flags);
3659 while (!kiblnd_data.kib_shutdown) {
3660 int do_failover = 0;
3663 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3665 if (cfs_time_before(cfs_time_current(),
3666 dev->ibd_next_failover))
3673 list_del_init(&dev->ibd_fail_list);
3674 dev->ibd_failover = 1;
3675 write_unlock_irqrestore(glock, flags);
3677 rc = kiblnd_dev_failover(dev);
3679 write_lock_irqsave(glock, flags);
3681 LASSERT (dev->ibd_failover);
3682 dev->ibd_failover = 0;
3683 if (rc >= 0) { /* Device is OK or failover succeed */
3684 dev->ibd_next_failover = cfs_time_shift(3);
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);
3699 /* long sleep if no more pending failover */
3700 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3702 set_current_state(TASK_INTERRUPTIBLE);
3703 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3704 write_unlock_irqrestore(glock, flags);
3706 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3707 cfs_time_seconds(1));
3708 set_current_state(TASK_RUNNING);
3709 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3710 write_lock_irqsave(glock, flags);
3712 if (!long_sleep || rc != 0)
3715 /* have a long sleep, routine check all active devices,
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
3718 * on wrong HCA for ever while there is a bonding failover */
3719 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3720 if (kiblnd_dev_can_failover(dev)) {
3721 list_add_tail(&dev->ibd_fail_list,
3722 &kiblnd_data.kib_failed_devs);
3727 write_unlock_irqrestore(glock, flags);
3729 kiblnd_thread_fini();