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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2015, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lnet/klnds/o2iblnd/o2iblnd_cb.c
38 * Author: Eric Barton <eric@bartonsoftware.com>
43 static void kiblnd_peer_alive(kib_peer_t *peer);
44 static void kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error);
45 static void kiblnd_check_sends(kib_conn_t *conn);
46 static void kiblnd_init_tx_msg(lnet_ni_t *ni, kib_tx_t *tx,
47 int type, int body_nob);
48 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
49 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
50 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
51 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
52 static void kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx);
55 kiblnd_tx_done (lnet_ni_t *ni, kib_tx_t *tx)
57 lnet_msg_t *lntmsg[2];
58 kib_net_t *net = ni->ni_data;
62 LASSERT (net != NULL);
63 LASSERT (!in_interrupt());
64 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
65 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
66 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer response */
67 LASSERT (tx->tx_pool != NULL);
69 kiblnd_unmap_tx(ni, tx);
71 /* tx may have up to 2 lnet msgs to finalise */
72 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
73 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
76 if (tx->tx_conn != NULL) {
77 LASSERT (ni == tx->tx_conn->ibc_peer->ibp_ni);
79 kiblnd_conn_decref(tx->tx_conn);
86 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
88 /* delay finalize until my descs have been freed */
89 for (i = 0; i < 2; i++) {
90 if (lntmsg[i] == NULL)
93 lnet_finalize(ni, lntmsg[i], rc);
98 kiblnd_txlist_done(lnet_ni_t *ni, struct list_head *txlist, int status)
102 while (!list_empty(txlist)) {
103 tx = list_entry(txlist->next, kib_tx_t, tx_list);
105 list_del(&tx->tx_list);
108 tx->tx_status = status;
109 kiblnd_tx_done(ni, tx);
114 kiblnd_get_idle_tx(lnet_ni_t *ni, lnet_nid_t target)
116 kib_net_t *net = (kib_net_t *)ni->ni_data;
117 struct list_head *node;
119 kib_tx_poolset_t *tps;
121 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
122 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
125 tx = container_of(node, kib_tx_t, tx_list);
127 LASSERT (tx->tx_nwrq == 0);
128 LASSERT (!tx->tx_queued);
129 LASSERT (tx->tx_sending == 0);
130 LASSERT (!tx->tx_waiting);
131 LASSERT (tx->tx_status == 0);
132 LASSERT (tx->tx_conn == NULL);
133 LASSERT (tx->tx_lntmsg[0] == NULL);
134 LASSERT (tx->tx_lntmsg[1] == NULL);
135 LASSERT (tx->tx_nfrags == 0);
141 kiblnd_drop_rx(kib_rx_t *rx)
143 kib_conn_t *conn = rx->rx_conn;
144 struct kib_sched_info *sched = conn->ibc_sched;
147 spin_lock_irqsave(&sched->ibs_lock, flags);
148 LASSERT(conn->ibc_nrx > 0);
150 spin_unlock_irqrestore(&sched->ibs_lock, flags);
152 kiblnd_conn_decref(conn);
156 kiblnd_post_rx (kib_rx_t *rx, int credit)
158 kib_conn_t *conn = rx->rx_conn;
159 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
160 struct ib_recv_wr *bad_wrq = NULL;
161 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
164 LASSERT (net != NULL);
165 LASSERT (!in_interrupt());
166 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
167 credit == IBLND_POSTRX_PEER_CREDIT ||
168 credit == IBLND_POSTRX_RSRVD_CREDIT);
171 rx->rx_sge.lkey = mr->lkey;
172 rx->rx_sge.addr = rx->rx_msgaddr;
173 rx->rx_sge.length = IBLND_MSG_SIZE;
175 rx->rx_wrq.next = NULL;
176 rx->rx_wrq.sg_list = &rx->rx_sge;
177 rx->rx_wrq.num_sge = 1;
178 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
180 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
181 LASSERT (rx->rx_nob >= 0); /* not posted */
183 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
184 kiblnd_drop_rx(rx); /* No more posts for this rx */
188 rx->rx_nob = -1; /* flag posted */
190 /* NB: need an extra reference after ib_post_recv because we don't
191 * own this rx (and rx::rx_conn) anymore, LU-5678.
193 kiblnd_conn_addref(conn);
194 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
195 if (unlikely(rc != 0)) {
196 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
197 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
201 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
204 if (unlikely(rc != 0)) {
205 kiblnd_close_conn(conn, rc);
206 kiblnd_drop_rx(rx); /* No more posts for this rx */
210 if (credit == IBLND_POSTRX_NO_CREDIT)
213 spin_lock(&conn->ibc_lock);
214 if (credit == IBLND_POSTRX_PEER_CREDIT)
215 conn->ibc_outstanding_credits++;
217 conn->ibc_reserved_credits++;
218 spin_unlock(&conn->ibc_lock);
220 kiblnd_check_sends(conn);
222 kiblnd_conn_decref(conn);
227 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
229 struct list_head *tmp;
231 list_for_each(tmp, &conn->ibc_active_txs) {
232 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
234 LASSERT(!tx->tx_queued);
235 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
237 if (tx->tx_cookie != cookie)
240 if (tx->tx_waiting &&
241 tx->tx_msg->ibm_type == txtype)
244 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
245 tx->tx_waiting ? "" : "NOT ",
246 tx->tx_msg->ibm_type, txtype);
252 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
255 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
258 spin_lock(&conn->ibc_lock);
260 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
262 spin_unlock(&conn->ibc_lock);
264 CWARN("Unmatched completion type %x cookie "LPX64" from %s\n",
265 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
266 kiblnd_close_conn(conn, -EPROTO);
270 if (tx->tx_status == 0) { /* success so far */
271 if (status < 0) { /* failed? */
272 tx->tx_status = status;
273 } else if (txtype == IBLND_MSG_GET_REQ) {
274 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
280 idle = !tx->tx_queued && (tx->tx_sending == 0);
282 list_del(&tx->tx_list);
284 spin_unlock(&conn->ibc_lock);
287 kiblnd_tx_done(ni, tx);
291 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
293 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
294 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
297 CERROR("Can't get tx for completion %x for %s\n",
298 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
302 tx->tx_msg->ibm_u.completion.ibcm_status = status;
303 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
304 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
306 kiblnd_queue_tx(tx, conn);
310 kiblnd_handle_rx (kib_rx_t *rx)
312 kib_msg_t *msg = rx->rx_msg;
313 kib_conn_t *conn = rx->rx_conn;
314 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
315 int credits = msg->ibm_credits;
321 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
323 CDEBUG (D_NET, "Received %x[%d] from %s\n",
324 msg->ibm_type, credits,
325 libcfs_nid2str(conn->ibc_peer->ibp_nid));
328 /* Have I received credits that will let me send? */
329 spin_lock(&conn->ibc_lock);
331 if (conn->ibc_credits + credits >
332 conn->ibc_queue_depth) {
333 rc2 = conn->ibc_credits;
334 spin_unlock(&conn->ibc_lock);
336 CERROR("Bad credits from %s: %d + %d > %d\n",
337 libcfs_nid2str(conn->ibc_peer->ibp_nid),
339 conn->ibc_queue_depth);
341 kiblnd_close_conn(conn, -EPROTO);
342 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
346 conn->ibc_credits += credits;
348 /* This ensures the credit taken by NOOP can be returned */
349 if (msg->ibm_type == IBLND_MSG_NOOP &&
350 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
351 conn->ibc_outstanding_credits++;
353 spin_unlock(&conn->ibc_lock);
354 kiblnd_check_sends(conn);
357 switch (msg->ibm_type) {
359 CERROR("Bad IBLND message type %x from %s\n",
360 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
361 post_credit = IBLND_POSTRX_NO_CREDIT;
366 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
367 post_credit = IBLND_POSTRX_NO_CREDIT;
371 if (credits != 0) /* credit already posted */
372 post_credit = IBLND_POSTRX_NO_CREDIT;
373 else /* a keepalive NOOP */
374 post_credit = IBLND_POSTRX_PEER_CREDIT;
377 case IBLND_MSG_IMMEDIATE:
378 post_credit = IBLND_POSTRX_DONT_POST;
379 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
380 msg->ibm_srcnid, rx, 0);
381 if (rc < 0) /* repost on error */
382 post_credit = IBLND_POSTRX_PEER_CREDIT;
385 case IBLND_MSG_PUT_REQ:
386 post_credit = IBLND_POSTRX_DONT_POST;
387 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
388 msg->ibm_srcnid, rx, 1);
389 if (rc < 0) /* repost on error */
390 post_credit = IBLND_POSTRX_PEER_CREDIT;
393 case IBLND_MSG_PUT_NAK:
394 CWARN ("PUT_NACK from %s\n",
395 libcfs_nid2str(conn->ibc_peer->ibp_nid));
396 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
397 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
398 msg->ibm_u.completion.ibcm_status,
399 msg->ibm_u.completion.ibcm_cookie);
402 case IBLND_MSG_PUT_ACK:
403 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
405 spin_lock(&conn->ibc_lock);
406 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
407 msg->ibm_u.putack.ibpam_src_cookie);
409 list_del(&tx->tx_list);
410 spin_unlock(&conn->ibc_lock);
413 CERROR("Unmatched PUT_ACK from %s\n",
414 libcfs_nid2str(conn->ibc_peer->ibp_nid));
419 LASSERT (tx->tx_waiting);
420 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
421 * (a) I can overwrite tx_msg since my peer has received it!
422 * (b) tx_waiting set tells tx_complete() it's not done. */
424 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
426 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
427 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
428 &msg->ibm_u.putack.ibpam_rd,
429 msg->ibm_u.putack.ibpam_dst_cookie);
431 CERROR("Can't setup rdma for PUT to %s: %d\n",
432 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
434 spin_lock(&conn->ibc_lock);
435 tx->tx_waiting = 0; /* clear waiting and queue atomically */
436 kiblnd_queue_tx_locked(tx, conn);
437 spin_unlock(&conn->ibc_lock);
440 case IBLND_MSG_PUT_DONE:
441 post_credit = IBLND_POSTRX_PEER_CREDIT;
442 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
443 msg->ibm_u.completion.ibcm_status,
444 msg->ibm_u.completion.ibcm_cookie);
447 case IBLND_MSG_GET_REQ:
448 post_credit = IBLND_POSTRX_DONT_POST;
449 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
450 msg->ibm_srcnid, rx, 1);
451 if (rc < 0) /* repost on error */
452 post_credit = IBLND_POSTRX_PEER_CREDIT;
455 case IBLND_MSG_GET_DONE:
456 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
457 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
458 msg->ibm_u.completion.ibcm_status,
459 msg->ibm_u.completion.ibcm_cookie);
463 if (rc < 0) /* protocol error */
464 kiblnd_close_conn(conn, rc);
466 if (post_credit != IBLND_POSTRX_DONT_POST)
467 kiblnd_post_rx(rx, post_credit);
471 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
473 kib_msg_t *msg = rx->rx_msg;
474 kib_conn_t *conn = rx->rx_conn;
475 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
476 kib_net_t *net = ni->ni_data;
480 LASSERT (net != NULL);
481 LASSERT (rx->rx_nob < 0); /* was posted */
482 rx->rx_nob = 0; /* isn't now */
484 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
487 if (status != IB_WC_SUCCESS) {
488 CNETERR("Rx from %s failed: %d\n",
489 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
496 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
498 CERROR ("Error %d unpacking rx from %s\n",
499 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
503 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
504 msg->ibm_dstnid != ni->ni_nid ||
505 msg->ibm_srcstamp != conn->ibc_incarnation ||
506 msg->ibm_dststamp != net->ibn_incarnation) {
507 CERROR ("Stale rx from %s\n",
508 libcfs_nid2str(conn->ibc_peer->ibp_nid));
513 /* set time last known alive */
514 kiblnd_peer_alive(conn->ibc_peer);
516 /* racing with connection establishment/teardown! */
518 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
519 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
522 write_lock_irqsave(g_lock, flags);
523 /* must check holding global lock to eliminate race */
524 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
525 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
526 write_unlock_irqrestore(g_lock, flags);
529 write_unlock_irqrestore(g_lock, flags);
531 kiblnd_handle_rx(rx);
535 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
536 kiblnd_close_conn(conn, err);
538 kiblnd_drop_rx(rx); /* Don't re-post rx. */
542 kiblnd_kvaddr_to_page (unsigned long vaddr)
546 if (is_vmalloc_addr((void *)vaddr)) {
547 page = vmalloc_to_page ((void *)vaddr);
548 LASSERT (page != NULL);
551 #ifdef CONFIG_HIGHMEM
552 if (vaddr >= PKMAP_BASE &&
553 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
554 /* No highmem pages only used for bulk (kiov) I/O */
555 CERROR("find page for address in highmem\n");
559 page = virt_to_page (vaddr);
560 LASSERT (page != NULL);
565 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, int nob)
568 __u64 *pages = tx->tx_pages;
569 kib_fmr_poolset_t *fps;
576 LASSERT(tx->tx_pool != NULL);
577 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
579 hdev = tx->tx_pool->tpo_hdev;
581 for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
582 for (size = 0; size < rd->rd_frags[i].rf_nob;
583 size += hdev->ibh_page_size) {
584 pages[npages ++] = (rd->rd_frags[i].rf_addr &
585 hdev->ibh_page_mask) + size;
589 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
591 fps = net->ibn_fmr_ps[cpt];
592 rc = kiblnd_fmr_pool_map(fps, pages, npages, 0, &tx->fmr);
594 CERROR ("Can't map %d pages: %d\n", npages, rc);
598 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
600 rd->rd_key = (rd != tx->tx_rd) ? tx->fmr.fmr_pfmr->fmr->rkey :
601 tx->fmr.fmr_pfmr->fmr->lkey;
602 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
603 rd->rd_frags[0].rf_nob = nob;
610 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
612 kib_net_t *net = ni->ni_data;
614 LASSERT(net != NULL);
616 if (net->ibn_fmr_ps != NULL && tx->fmr.fmr_pfmr != NULL) {
617 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
618 tx->fmr.fmr_pfmr = NULL;
621 if (tx->tx_nfrags != 0) {
622 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
623 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
629 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
631 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
632 kib_net_t *net = ni->ni_data;
633 struct ib_mr *mr = NULL;
637 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
639 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
640 tx->tx_nfrags = nfrags;
642 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
643 tx->tx_nfrags, tx->tx_dmadir);
645 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
646 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
647 hdev->ibh_ibdev, &tx->tx_frags[i]);
648 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
649 hdev->ibh_ibdev, &tx->tx_frags[i]);
650 nob += rd->rd_frags[i].rf_nob;
653 mr = kiblnd_find_rd_dma_mr(hdev, rd,
654 (tx->tx_conn != NULL) ?
655 tx->tx_conn->ibc_max_frags : -1);
657 /* found pre-mapping MR */
658 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
662 if (net->ibn_fmr_ps != NULL)
663 return kiblnd_fmr_map_tx(net, tx, rd, nob);
670 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
671 unsigned int niov, struct kvec *iov, int offset, int nob)
673 kib_net_t *net = ni->ni_data;
675 struct scatterlist *sg;
682 LASSERT (net != NULL);
684 while (offset >= iov->iov_len) {
685 offset -= iov->iov_len;
695 vaddr = ((unsigned long)iov->iov_base) + offset;
696 page_offset = vaddr & (PAGE_SIZE - 1);
697 page = kiblnd_kvaddr_to_page(vaddr);
699 CERROR ("Can't find page\n");
703 fragnob = min((int)(iov->iov_len - offset), nob);
704 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
706 sg_set_page(sg, page, fragnob, page_offset);
709 if (offset + fragnob < iov->iov_len) {
719 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
723 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
724 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
726 kib_net_t *net = ni->ni_data;
727 struct scatterlist *sg;
730 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
734 LASSERT (net != NULL);
736 while (offset >= kiov->kiov_len) {
737 offset -= kiov->kiov_len;
747 fragnob = min((int)(kiov->kiov_len - offset), nob);
749 sg_set_page(sg, kiov->kiov_page, fragnob,
750 kiov->kiov_offset + offset);
759 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
763 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
764 __must_hold(&conn->ibc_lock)
766 kib_msg_t *msg = tx->tx_msg;
767 kib_peer_t *peer = conn->ibc_peer;
768 int ver = conn->ibc_version;
772 LASSERT(tx->tx_queued);
773 /* We rely on this for QP sizing */
774 LASSERT(tx->tx_nwrq > 0);
775 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
777 LASSERT(credit == 0 || credit == 1);
778 LASSERT(conn->ibc_outstanding_credits >= 0);
779 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
780 LASSERT(conn->ibc_credits >= 0);
781 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
783 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
784 /* tx completions outstanding... */
785 CDEBUG(D_NET, "%s: posted enough\n",
786 libcfs_nid2str(peer->ibp_nid));
790 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
791 CDEBUG(D_NET, "%s: no credits\n",
792 libcfs_nid2str(peer->ibp_nid));
796 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
797 conn->ibc_credits == 1 && /* last credit reserved */
798 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
799 CDEBUG(D_NET, "%s: not using last credit\n",
800 libcfs_nid2str(peer->ibp_nid));
804 /* NB don't drop ibc_lock before bumping tx_sending */
805 list_del(&tx->tx_list);
808 if (msg->ibm_type == IBLND_MSG_NOOP &&
809 (!kiblnd_need_noop(conn) || /* redundant NOOP */
810 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
811 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
812 /* OK to drop when posted enough NOOPs, since
813 * kiblnd_check_sends will queue NOOP again when
814 * posted NOOPs complete */
815 spin_unlock(&conn->ibc_lock);
816 kiblnd_tx_done(peer->ibp_ni, tx);
817 spin_lock(&conn->ibc_lock);
818 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
819 libcfs_nid2str(peer->ibp_nid),
820 conn->ibc_noops_posted);
824 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
825 peer->ibp_nid, conn->ibc_incarnation);
827 conn->ibc_credits -= credit;
828 conn->ibc_outstanding_credits = 0;
829 conn->ibc_nsends_posted++;
830 if (msg->ibm_type == IBLND_MSG_NOOP)
831 conn->ibc_noops_posted++;
833 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
834 * PUT. If so, it was first queued here as a PUT_REQ, sent and
835 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
836 * and then re-queued here. It's (just) possible that
837 * tx_sending is non-zero if we've not done the tx_complete()
838 * from the first send; hence the ++ rather than = below. */
840 list_add(&tx->tx_list, &conn->ibc_active_txs);
842 /* I'm still holding ibc_lock! */
843 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
845 } else if (tx->tx_pool->tpo_pool.po_failed ||
846 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
847 /* close_conn will launch failover */
850 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq - 1];
852 LASSERTF(wrq->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
853 "bad wr_id "LPX64", opc %d, flags %d, peer: %s\n",
854 wrq->wr_id, wrq->opcode, wrq->send_flags,
855 libcfs_nid2str(conn->ibc_peer->ibp_nid));
857 rc = ib_post_send(conn->ibc_cmid->qp, tx->tx_wrq, &wrq);
860 conn->ibc_last_send = jiffies;
865 /* NB credits are transferred in the actual
866 * message, which can only be the last work item */
867 conn->ibc_credits += credit;
868 conn->ibc_outstanding_credits += msg->ibm_credits;
869 conn->ibc_nsends_posted--;
870 if (msg->ibm_type == IBLND_MSG_NOOP)
871 conn->ibc_noops_posted--;
877 done = (tx->tx_sending == 0);
879 list_del(&tx->tx_list);
881 spin_unlock(&conn->ibc_lock);
883 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
884 CERROR("Error %d posting transmit to %s\n",
885 rc, libcfs_nid2str(peer->ibp_nid));
887 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
888 rc, libcfs_nid2str(peer->ibp_nid));
890 kiblnd_close_conn(conn, rc);
893 kiblnd_tx_done(peer->ibp_ni, tx);
895 spin_lock(&conn->ibc_lock);
901 kiblnd_check_sends (kib_conn_t *conn)
903 int ver = conn->ibc_version;
904 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
907 /* Don't send anything until after the connection is established */
908 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
909 CDEBUG(D_NET, "%s too soon\n",
910 libcfs_nid2str(conn->ibc_peer->ibp_nid));
914 spin_lock(&conn->ibc_lock);
916 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
917 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
918 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
919 LASSERT (conn->ibc_reserved_credits >= 0);
921 while (conn->ibc_reserved_credits > 0 &&
922 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
923 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
925 list_del(&tx->tx_list);
926 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
927 conn->ibc_reserved_credits--;
930 if (kiblnd_need_noop(conn)) {
931 spin_unlock(&conn->ibc_lock);
933 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
935 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
937 spin_lock(&conn->ibc_lock);
939 kiblnd_queue_tx_locked(tx, conn);
945 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
947 tx = list_entry(conn->ibc_tx_queue_nocred.next,
949 } else if (!list_empty(&conn->ibc_tx_noops)) {
950 LASSERT (!IBLND_OOB_CAPABLE(ver));
952 tx = list_entry(conn->ibc_tx_noops.next,
954 } else if (!list_empty(&conn->ibc_tx_queue)) {
956 tx = list_entry(conn->ibc_tx_queue.next,
961 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
965 spin_unlock(&conn->ibc_lock);
969 kiblnd_tx_complete (kib_tx_t *tx, int status)
971 int failed = (status != IB_WC_SUCCESS);
972 kib_conn_t *conn = tx->tx_conn;
975 LASSERT (tx->tx_sending > 0);
978 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
979 CNETERR("Tx -> %s cookie "LPX64
980 " sending %d waiting %d: failed %d\n",
981 libcfs_nid2str(conn->ibc_peer->ibp_nid),
982 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
985 kiblnd_close_conn(conn, -EIO);
987 kiblnd_peer_alive(conn->ibc_peer);
990 spin_lock(&conn->ibc_lock);
992 /* I could be racing with rdma completion. Whoever makes 'tx' idle
993 * gets to free it, which also drops its ref on 'conn'. */
996 conn->ibc_nsends_posted--;
997 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
998 conn->ibc_noops_posted--;
1001 tx->tx_waiting = 0; /* don't wait for peer */
1002 tx->tx_status = -EIO;
1005 idle = (tx->tx_sending == 0) && /* This is the final callback */
1006 !tx->tx_waiting && /* Not waiting for peer */
1007 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1009 list_del(&tx->tx_list);
1011 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1013 spin_unlock(&conn->ibc_lock);
1016 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1018 kiblnd_check_sends(conn);
1020 kiblnd_conn_decref(conn); /* ...until here */
1024 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1026 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1027 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1028 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1029 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1030 struct ib_mr *mr = hdev->ibh_mrs;
1032 LASSERT(tx->tx_nwrq >= 0);
1033 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1034 LASSERT(nob <= IBLND_MSG_SIZE);
1035 LASSERT(mr != NULL);
1037 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1039 sge->lkey = mr->lkey;
1040 sge->addr = tx->tx_msgaddr;
1043 memset(wrq, 0, sizeof(*wrq));
1046 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1049 wrq->opcode = IB_WR_SEND;
1050 wrq->send_flags = IB_SEND_SIGNALED;
1056 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1057 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1059 kib_msg_t *ibmsg = tx->tx_msg;
1060 kib_rdma_desc_t *srcrd = tx->tx_rd;
1061 struct ib_sge *sge = &tx->tx_sge[0];
1062 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1068 LASSERT (!in_interrupt());
1069 LASSERT (tx->tx_nwrq == 0);
1070 LASSERT (type == IBLND_MSG_GET_DONE ||
1071 type == IBLND_MSG_PUT_DONE);
1073 srcidx = dstidx = 0;
1076 if (srcidx >= srcrd->rd_nfrags) {
1077 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1082 if (dstidx == dstrd->rd_nfrags) {
1083 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1088 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1089 CERROR("RDMA has too many fragments for peer %s (%d), "
1090 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1091 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1092 conn->ibc_max_frags,
1093 srcidx, srcrd->rd_nfrags,
1094 dstidx, dstrd->rd_nfrags);
1099 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1100 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1102 sge = &tx->tx_sge[tx->tx_nwrq];
1103 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1104 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1105 sge->length = wrknob;
1107 wrq = &tx->tx_wrq[tx->tx_nwrq];
1109 wrq->next = wrq + 1;
1110 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1113 wrq->opcode = IB_WR_RDMA_WRITE;
1114 wrq->send_flags = 0;
1116 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1117 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1119 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1120 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1129 if (rc < 0) /* no RDMA if completing with failure */
1132 ibmsg->ibm_u.completion.ibcm_status = rc;
1133 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1134 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1135 type, sizeof (kib_completion_msg_t));
1141 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1143 struct list_head *q;
1145 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1146 LASSERT(!tx->tx_queued); /* not queued for sending already */
1147 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1150 tx->tx_deadline = jiffies +
1151 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1154 if (tx->tx_conn == NULL) {
1155 kiblnd_conn_addref(conn);
1157 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1159 /* PUT_DONE first attached to conn as a PUT_REQ */
1160 LASSERT (tx->tx_conn == conn);
1161 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1164 switch (tx->tx_msg->ibm_type) {
1168 case IBLND_MSG_PUT_REQ:
1169 case IBLND_MSG_GET_REQ:
1170 q = &conn->ibc_tx_queue_rsrvd;
1173 case IBLND_MSG_PUT_NAK:
1174 case IBLND_MSG_PUT_ACK:
1175 case IBLND_MSG_PUT_DONE:
1176 case IBLND_MSG_GET_DONE:
1177 q = &conn->ibc_tx_queue_nocred;
1180 case IBLND_MSG_NOOP:
1181 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1182 q = &conn->ibc_tx_queue_nocred;
1184 q = &conn->ibc_tx_noops;
1187 case IBLND_MSG_IMMEDIATE:
1188 q = &conn->ibc_tx_queue;
1192 list_add_tail(&tx->tx_list, q);
1196 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1198 spin_lock(&conn->ibc_lock);
1199 kiblnd_queue_tx_locked(tx, conn);
1200 spin_unlock(&conn->ibc_lock);
1202 kiblnd_check_sends(conn);
1205 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1206 struct sockaddr_in *srcaddr,
1207 struct sockaddr_in *dstaddr,
1210 unsigned short port;
1213 /* allow the port to be reused */
1214 rc = rdma_set_reuseaddr(cmid, 1);
1216 CERROR("Unable to set reuse on cmid: %d\n", rc);
1220 /* look for a free privileged port */
1221 for (port = PROT_SOCK-1; port > 0; port--) {
1222 srcaddr->sin_port = htons(port);
1223 rc = rdma_resolve_addr(cmid,
1224 (struct sockaddr *)srcaddr,
1225 (struct sockaddr *)dstaddr,
1228 CDEBUG(D_NET, "bound to port %hu\n", port);
1230 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1231 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1238 CERROR("Failed to bind to a free privileged port\n");
1243 kiblnd_connect_peer (kib_peer_t *peer)
1245 struct rdma_cm_id *cmid;
1247 kib_net_t *net = peer->ibp_ni->ni_data;
1248 struct sockaddr_in srcaddr;
1249 struct sockaddr_in dstaddr;
1252 LASSERT (net != NULL);
1253 LASSERT (peer->ibp_connecting > 0);
1254 LASSERT(!peer->ibp_reconnecting);
1256 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1260 CERROR("Can't create CMID for %s: %ld\n",
1261 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1267 memset(&srcaddr, 0, sizeof(srcaddr));
1268 srcaddr.sin_family = AF_INET;
1269 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1271 memset(&dstaddr, 0, sizeof(dstaddr));
1272 dstaddr.sin_family = AF_INET;
1273 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1274 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1276 kiblnd_peer_addref(peer); /* cmid's ref */
1278 if (*kiblnd_tunables.kib_use_priv_port) {
1279 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1280 *kiblnd_tunables.kib_timeout * 1000);
1282 rc = rdma_resolve_addr(cmid,
1283 (struct sockaddr *)&srcaddr,
1284 (struct sockaddr *)&dstaddr,
1285 *kiblnd_tunables.kib_timeout * 1000);
1288 /* Can't initiate address resolution: */
1289 CERROR("Can't resolve addr for %s: %d\n",
1290 libcfs_nid2str(peer->ibp_nid), rc);
1294 LASSERT (cmid->device != NULL);
1295 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1296 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1297 &dev->ibd_ifip, cmid->device->name);
1302 kiblnd_peer_connect_failed(peer, 1, rc);
1303 kiblnd_peer_decref(peer); /* cmid's ref */
1304 rdma_destroy_id(cmid);
1307 kiblnd_peer_connect_failed(peer, 1, rc);
1311 kiblnd_reconnect_peer(kib_peer_t *peer, bool connrace_win)
1313 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1314 char *reason = NULL;
1315 struct list_head txs;
1316 unsigned long flags;
1318 INIT_LIST_HEAD(&txs);
1320 write_lock_irqsave(glock, flags);
1321 if (peer->ibp_reconnecting == 0) {
1322 if (peer->ibp_accepting)
1323 reason = "accepting";
1324 else if (peer->ibp_connecting)
1325 reason = "connecting";
1326 else if (!list_empty(&peer->ibp_conns))
1327 reason = "connected";
1328 else /* connected then closed */
1334 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1335 list_empty(&peer->ibp_conns));
1336 peer->ibp_reconnecting = 0;
1338 if (!kiblnd_peer_active(peer)) {
1339 list_splice_init(&peer->ibp_tx_queue, &txs);
1340 reason = "unlinked";
1344 peer->ibp_connecting++;
1345 peer->ibp_reconnected++;
1347 LASSERT(!peer->ibp_connrace_win);
1349 * If I have lost connrace for enough times and want to win the race,
1350 * I need to flag this peer so I can use IBLND_CONNREQ_WIN_WISH for
1351 * the next connection request, and reject incoming connection request
1354 if (peer->ibp_nid > peer->ibp_ni->ni_nid)
1355 peer->ibp_connrace_win = connrace_win;
1357 write_unlock_irqrestore(glock, flags);
1359 kiblnd_connect_peer(peer);
1363 write_unlock_irqrestore(glock, flags);
1365 CWARN("Abort reconnection of %s: %s\n",
1366 libcfs_nid2str(peer->ibp_nid), reason);
1367 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1372 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1377 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1378 unsigned long flags;
1381 /* If I get here, I've committed to send, so I complete the tx with
1382 * failure on any problems */
1384 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1385 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1387 /* First time, just use a read lock since I expect to find my peer
1389 read_lock_irqsave(g_lock, flags);
1391 peer = kiblnd_find_peer_locked(nid);
1392 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1393 /* Found a peer with an established connection */
1394 conn = kiblnd_get_conn_locked(peer);
1395 kiblnd_conn_addref(conn); /* 1 ref for me... */
1397 read_unlock_irqrestore(g_lock, flags);
1400 kiblnd_queue_tx(tx, conn);
1401 kiblnd_conn_decref(conn); /* ...to here */
1405 read_unlock(g_lock);
1406 /* Re-try with a write lock */
1409 peer = kiblnd_find_peer_locked(nid);
1411 if (list_empty(&peer->ibp_conns)) {
1412 /* found a peer, but it's still connecting... */
1413 LASSERT(kiblnd_peer_connecting(peer));
1415 list_add_tail(&tx->tx_list,
1416 &peer->ibp_tx_queue);
1417 write_unlock_irqrestore(g_lock, flags);
1419 conn = kiblnd_get_conn_locked(peer);
1420 kiblnd_conn_addref(conn); /* 1 ref for me... */
1422 write_unlock_irqrestore(g_lock, flags);
1425 kiblnd_queue_tx(tx, conn);
1426 kiblnd_conn_decref(conn); /* ...to here */
1431 write_unlock_irqrestore(g_lock, flags);
1433 /* Allocate a peer ready to add to the peer table and retry */
1434 rc = kiblnd_create_peer(ni, &peer, nid);
1436 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1438 tx->tx_status = -EHOSTUNREACH;
1440 kiblnd_tx_done(ni, tx);
1445 write_lock_irqsave(g_lock, flags);
1447 peer2 = kiblnd_find_peer_locked(nid);
1448 if (peer2 != NULL) {
1449 if (list_empty(&peer2->ibp_conns)) {
1450 /* found a peer, but it's still connecting... */
1451 LASSERT(kiblnd_peer_connecting(peer2));
1453 list_add_tail(&tx->tx_list,
1454 &peer2->ibp_tx_queue);
1455 write_unlock_irqrestore(g_lock, flags);
1457 conn = kiblnd_get_conn_locked(peer2);
1458 kiblnd_conn_addref(conn); /* 1 ref for me... */
1460 write_unlock_irqrestore(g_lock, flags);
1463 kiblnd_queue_tx(tx, conn);
1464 kiblnd_conn_decref(conn); /* ...to here */
1467 kiblnd_peer_decref(peer);
1471 /* Brand new peer */
1472 LASSERT (peer->ibp_connecting == 0);
1473 peer->ibp_connecting = 1;
1475 /* always called with a ref on ni, which prevents ni being shutdown */
1476 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1479 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1481 kiblnd_peer_addref(peer);
1482 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1484 write_unlock_irqrestore(g_lock, flags);
1486 kiblnd_connect_peer(peer);
1487 kiblnd_peer_decref(peer);
1491 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1493 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1494 int type = lntmsg->msg_type;
1495 lnet_process_id_t target = lntmsg->msg_target;
1496 int target_is_router = lntmsg->msg_target_is_router;
1497 int routing = lntmsg->msg_routing;
1498 unsigned int payload_niov = lntmsg->msg_niov;
1499 struct kvec *payload_iov = lntmsg->msg_iov;
1500 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1501 unsigned int payload_offset = lntmsg->msg_offset;
1502 unsigned int payload_nob = lntmsg->msg_len;
1504 kib_rdma_desc_t *rd;
1509 /* NB 'private' is different depending on what we're sending.... */
1511 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1512 payload_nob, payload_niov, libcfs_id2str(target));
1514 LASSERT (payload_nob == 0 || payload_niov > 0);
1515 LASSERT (payload_niov <= LNET_MAX_IOV);
1517 /* Thread context */
1518 LASSERT (!in_interrupt());
1519 /* payload is either all vaddrs or all pages */
1520 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1528 LASSERT (payload_nob == 0);
1532 if (routing || target_is_router)
1533 break; /* send IMMEDIATE */
1535 /* is the REPLY message too small for RDMA? */
1536 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1537 if (nob <= IBLND_MSG_SIZE)
1538 break; /* send IMMEDIATE */
1540 tx = kiblnd_get_idle_tx(ni, target.nid);
1542 CERROR("Can't allocate txd for GET to %s\n",
1543 libcfs_nid2str(target.nid));
1548 rd = &ibmsg->ibm_u.get.ibgm_rd;
1549 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1550 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1551 lntmsg->msg_md->md_niov,
1552 lntmsg->msg_md->md_iov.iov,
1553 0, lntmsg->msg_md->md_length);
1555 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1556 lntmsg->msg_md->md_niov,
1557 lntmsg->msg_md->md_iov.kiov,
1558 0, lntmsg->msg_md->md_length);
1560 CERROR("Can't setup GET sink for %s: %d\n",
1561 libcfs_nid2str(target.nid), rc);
1562 kiblnd_tx_done(ni, tx);
1566 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1567 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1568 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1570 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1572 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1573 if (tx->tx_lntmsg[1] == NULL) {
1574 CERROR("Can't create reply for GET -> %s\n",
1575 libcfs_nid2str(target.nid));
1576 kiblnd_tx_done(ni, tx);
1580 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1581 tx->tx_waiting = 1; /* waiting for GET_DONE */
1582 kiblnd_launch_tx(ni, tx, target.nid);
1585 case LNET_MSG_REPLY:
1587 /* Is the payload small enough not to need RDMA? */
1588 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1589 if (nob <= IBLND_MSG_SIZE)
1590 break; /* send IMMEDIATE */
1592 tx = kiblnd_get_idle_tx(ni, target.nid);
1594 CERROR("Can't allocate %s txd for %s\n",
1595 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1596 libcfs_nid2str(target.nid));
1600 if (payload_kiov == NULL)
1601 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1602 payload_niov, payload_iov,
1603 payload_offset, payload_nob);
1605 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1606 payload_niov, payload_kiov,
1607 payload_offset, payload_nob);
1609 CERROR("Can't setup PUT src for %s: %d\n",
1610 libcfs_nid2str(target.nid), rc);
1611 kiblnd_tx_done(ni, tx);
1616 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1617 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1618 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1620 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1621 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1622 kiblnd_launch_tx(ni, tx, target.nid);
1626 /* send IMMEDIATE */
1628 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1631 tx = kiblnd_get_idle_tx(ni, target.nid);
1633 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1634 type, libcfs_nid2str(target.nid));
1639 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1641 if (payload_kiov != NULL)
1642 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1643 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1644 payload_niov, payload_kiov,
1645 payload_offset, payload_nob);
1647 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1648 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1649 payload_niov, payload_iov,
1650 payload_offset, payload_nob);
1652 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1653 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1655 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1656 kiblnd_launch_tx(ni, tx, target.nid);
1661 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1663 lnet_process_id_t target = lntmsg->msg_target;
1664 unsigned int niov = lntmsg->msg_niov;
1665 struct kvec *iov = lntmsg->msg_iov;
1666 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1667 unsigned int offset = lntmsg->msg_offset;
1668 unsigned int nob = lntmsg->msg_len;
1672 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1674 CERROR("Can't get tx for REPLY to %s\n",
1675 libcfs_nid2str(target.nid));
1681 else if (kiov == NULL)
1682 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1683 niov, iov, offset, nob);
1685 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1686 niov, kiov, offset, nob);
1689 CERROR("Can't setup GET src for %s: %d\n",
1690 libcfs_nid2str(target.nid), rc);
1694 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1695 IBLND_MSG_GET_DONE, nob,
1696 &rx->rx_msg->ibm_u.get.ibgm_rd,
1697 rx->rx_msg->ibm_u.get.ibgm_cookie);
1699 CERROR("Can't setup rdma for GET from %s: %d\n",
1700 libcfs_nid2str(target.nid), rc);
1705 /* No RDMA: local completion may happen now! */
1706 lnet_finalize(ni, lntmsg, 0);
1708 /* RDMA: lnet_finalize(lntmsg) when it
1710 tx->tx_lntmsg[0] = lntmsg;
1713 kiblnd_queue_tx(tx, rx->rx_conn);
1717 kiblnd_tx_done(ni, tx);
1719 lnet_finalize(ni, lntmsg, -EIO);
1723 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1724 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1725 unsigned int offset, unsigned int mlen, unsigned int rlen)
1727 kib_rx_t *rx = private;
1728 kib_msg_t *rxmsg = rx->rx_msg;
1729 kib_conn_t *conn = rx->rx_conn;
1732 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1735 LASSERT (mlen <= rlen);
1736 LASSERT (!in_interrupt());
1737 /* Either all pages or all vaddrs */
1738 LASSERT (!(kiov != NULL && iov != NULL));
1740 switch (rxmsg->ibm_type) {
1744 case IBLND_MSG_IMMEDIATE:
1745 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1746 if (nob > rx->rx_nob) {
1747 CERROR ("Immediate message from %s too big: %d(%d)\n",
1748 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1755 lnet_copy_flat2kiov(niov, kiov, offset,
1756 IBLND_MSG_SIZE, rxmsg,
1757 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1760 lnet_copy_flat2iov(niov, iov, offset,
1761 IBLND_MSG_SIZE, rxmsg,
1762 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1764 lnet_finalize (ni, lntmsg, 0);
1767 case IBLND_MSG_PUT_REQ: {
1769 kib_rdma_desc_t *rd;
1772 lnet_finalize(ni, lntmsg, 0);
1773 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1774 rxmsg->ibm_u.putreq.ibprm_cookie);
1778 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1780 CERROR("Can't allocate tx for %s\n",
1781 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1782 /* Not replying will break the connection */
1788 rd = &txmsg->ibm_u.putack.ibpam_rd;
1790 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1791 niov, iov, offset, mlen);
1793 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1794 niov, kiov, offset, mlen);
1796 CERROR("Can't setup PUT sink for %s: %d\n",
1797 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1798 kiblnd_tx_done(ni, tx);
1799 /* tell peer it's over */
1800 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1801 rxmsg->ibm_u.putreq.ibprm_cookie);
1805 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1806 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1807 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1809 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1811 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1812 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1813 kiblnd_queue_tx(tx, conn);
1815 /* reposted buffer reserved for PUT_DONE */
1816 post_credit = IBLND_POSTRX_NO_CREDIT;
1820 case IBLND_MSG_GET_REQ:
1821 if (lntmsg != NULL) {
1822 /* Optimized GET; RDMA lntmsg's payload */
1823 kiblnd_reply(ni, rx, lntmsg);
1825 /* GET didn't match anything */
1826 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1828 rxmsg->ibm_u.get.ibgm_cookie);
1833 kiblnd_post_rx(rx, post_credit);
1838 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1840 struct task_struct *task = kthread_run(fn, arg, name);
1843 return PTR_ERR(task);
1845 atomic_inc(&kiblnd_data.kib_nthreads);
1850 kiblnd_thread_fini (void)
1852 atomic_dec (&kiblnd_data.kib_nthreads);
1856 kiblnd_peer_alive (kib_peer_t *peer)
1858 /* This is racy, but everyone's only writing cfs_time_current() */
1859 peer->ibp_last_alive = cfs_time_current();
1864 kiblnd_peer_notify (kib_peer_t *peer)
1867 cfs_time_t last_alive = 0;
1868 unsigned long flags;
1870 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1872 if (kiblnd_peer_idle(peer) && peer->ibp_error != 0) {
1873 error = peer->ibp_error;
1874 peer->ibp_error = 0;
1876 last_alive = peer->ibp_last_alive;
1879 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1882 lnet_notify(peer->ibp_ni,
1883 peer->ibp_nid, 0, last_alive);
1887 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1889 /* This just does the immediate housekeeping. 'error' is zero for a
1890 * normal shutdown which can happen only after the connection has been
1891 * established. If the connection is established, schedule the
1892 * connection to be finished off by the connd. Otherwise the connd is
1893 * already dealing with it (either to set it up or tear it down).
1894 * Caller holds kib_global_lock exclusively in irq context */
1895 kib_peer_t *peer = conn->ibc_peer;
1897 unsigned long flags;
1899 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1901 if (error != 0 && conn->ibc_comms_error == 0)
1902 conn->ibc_comms_error = error;
1904 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1905 return; /* already being handled */
1908 list_empty(&conn->ibc_tx_noops) &&
1909 list_empty(&conn->ibc_tx_queue) &&
1910 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1911 list_empty(&conn->ibc_tx_queue_nocred) &&
1912 list_empty(&conn->ibc_active_txs)) {
1913 CDEBUG(D_NET, "closing conn to %s\n",
1914 libcfs_nid2str(peer->ibp_nid));
1916 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1917 libcfs_nid2str(peer->ibp_nid), error,
1918 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1919 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1920 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1921 "" : "(sending_rsrvd)",
1922 list_empty(&conn->ibc_tx_queue_nocred) ?
1923 "" : "(sending_nocred)",
1924 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1927 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1928 list_del(&conn->ibc_list);
1929 /* connd (see below) takes over ibc_list's ref */
1931 if (list_empty(&peer->ibp_conns) && /* no more conns */
1932 kiblnd_peer_active(peer)) { /* still in peer table */
1933 kiblnd_unlink_peer_locked(peer);
1935 /* set/clear error on last conn */
1936 peer->ibp_error = conn->ibc_comms_error;
1939 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1942 kiblnd_dev_can_failover(dev)) {
1943 list_add_tail(&dev->ibd_fail_list,
1944 &kiblnd_data.kib_failed_devs);
1945 wake_up(&kiblnd_data.kib_failover_waitq);
1948 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1950 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1951 wake_up(&kiblnd_data.kib_connd_waitq);
1953 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1957 kiblnd_close_conn(kib_conn_t *conn, int error)
1959 unsigned long flags;
1961 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1963 kiblnd_close_conn_locked(conn, error);
1965 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1969 kiblnd_handle_early_rxs(kib_conn_t *conn)
1971 unsigned long flags;
1974 LASSERT(!in_interrupt());
1975 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1977 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1978 while (!list_empty(&conn->ibc_early_rxs)) {
1979 rx = list_entry(conn->ibc_early_rxs.next,
1981 list_del(&rx->rx_list);
1982 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1984 kiblnd_handle_rx(rx);
1986 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1988 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1992 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1994 struct list_head zombies = LIST_HEAD_INIT(zombies);
1995 struct list_head *tmp;
1996 struct list_head *nxt;
1999 spin_lock(&conn->ibc_lock);
2001 list_for_each_safe(tmp, nxt, txs) {
2002 tx = list_entry(tmp, kib_tx_t, tx_list);
2004 if (txs == &conn->ibc_active_txs) {
2005 LASSERT(!tx->tx_queued);
2006 LASSERT(tx->tx_waiting ||
2007 tx->tx_sending != 0);
2009 LASSERT(tx->tx_queued);
2012 tx->tx_status = -ECONNABORTED;
2015 if (tx->tx_sending == 0) {
2017 list_del(&tx->tx_list);
2018 list_add(&tx->tx_list, &zombies);
2022 spin_unlock(&conn->ibc_lock);
2024 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2028 kiblnd_finalise_conn (kib_conn_t *conn)
2030 LASSERT (!in_interrupt());
2031 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2033 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2035 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2036 * for connections that didn't get as far as being connected, because
2037 * rdma_disconnect() does this for free. */
2038 kiblnd_abort_receives(conn);
2040 /* Complete all tx descs not waiting for sends to complete.
2041 * NB we should be safe from RDMA now that the QP has changed state */
2043 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2044 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2045 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2046 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2047 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2049 kiblnd_handle_early_rxs(conn);
2053 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2055 struct list_head zombies = LIST_HEAD_INIT(zombies);
2056 unsigned long flags;
2058 LASSERT (error != 0);
2059 LASSERT (!in_interrupt());
2061 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2064 LASSERT (peer->ibp_connecting > 0);
2065 peer->ibp_connecting--;
2066 peer->ibp_connrace_win = 0;
2068 LASSERT (peer->ibp_accepting > 0);
2069 peer->ibp_accepting--;
2072 if (kiblnd_peer_connecting(peer)) {
2073 /* another connection attempt under way... */
2074 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2079 peer->ibp_reconnected = 0;
2080 if (list_empty(&peer->ibp_conns)) {
2081 /* Take peer's blocked transmits to complete with error */
2082 list_add(&zombies, &peer->ibp_tx_queue);
2083 list_del_init(&peer->ibp_tx_queue);
2085 if (kiblnd_peer_active(peer))
2086 kiblnd_unlink_peer_locked(peer);
2088 peer->ibp_error = error;
2090 /* Can't have blocked transmits if there are connections */
2091 LASSERT(list_empty(&peer->ibp_tx_queue));
2094 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2096 kiblnd_peer_notify(peer);
2098 if (list_empty(&zombies))
2101 CNETERR("Deleting messages for %s: connection failed\n",
2102 libcfs_nid2str(peer->ibp_nid));
2104 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2108 kiblnd_connreq_done(kib_conn_t *conn, int status)
2110 kib_peer_t *peer = conn->ibc_peer;
2112 struct list_head txs;
2113 unsigned long flags;
2116 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2118 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2119 libcfs_nid2str(peer->ibp_nid), active,
2120 conn->ibc_version, status);
2122 LASSERT (!in_interrupt());
2123 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2124 peer->ibp_connecting > 0) ||
2125 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2126 peer->ibp_accepting > 0));
2128 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2129 conn->ibc_connvars = NULL;
2132 /* failed to establish connection */
2133 kiblnd_peer_connect_failed(peer, active, status);
2134 kiblnd_finalise_conn(conn);
2138 /* connection established */
2139 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2141 conn->ibc_last_send = jiffies;
2142 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2143 kiblnd_peer_alive(peer);
2145 /* Add conn to peer's list and nuke any dangling conns from a different
2146 * peer instance... */
2147 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2148 list_add(&conn->ibc_list, &peer->ibp_conns);
2149 peer->ibp_reconnected = 0;
2151 peer->ibp_connecting--;
2152 peer->ibp_connrace_win = 0;
2154 peer->ibp_accepting--;
2157 if (peer->ibp_version == 0) {
2158 peer->ibp_version = conn->ibc_version;
2159 peer->ibp_incarnation = conn->ibc_incarnation;
2162 if (peer->ibp_version != conn->ibc_version ||
2163 peer->ibp_incarnation != conn->ibc_incarnation) {
2164 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2165 conn->ibc_incarnation);
2166 peer->ibp_version = conn->ibc_version;
2167 peer->ibp_incarnation = conn->ibc_incarnation;
2170 /* grab pending txs while I have the lock */
2171 list_add(&txs, &peer->ibp_tx_queue);
2172 list_del_init(&peer->ibp_tx_queue);
2174 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2175 conn->ibc_comms_error != 0) { /* error has happened already */
2176 lnet_ni_t *ni = peer->ibp_ni;
2178 /* start to shut down connection */
2179 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2180 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2182 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2187 /* refcount taken by cmid is not reliable after I released the glock
2188 * because this connection is visible to other threads now, another
2189 * thread can find and close this connection right after I released
2190 * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2191 * called, it can release the connection refcount taken by cmid.
2192 * It means the connection could be destroyed before I finish my
2195 kiblnd_conn_addref(conn);
2196 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2198 /* Schedule blocked txs */
2199 spin_lock(&conn->ibc_lock);
2200 while (!list_empty(&txs)) {
2201 tx = list_entry(txs.next, kib_tx_t, tx_list);
2202 list_del(&tx->tx_list);
2204 kiblnd_queue_tx_locked(tx, conn);
2206 spin_unlock(&conn->ibc_lock);
2208 kiblnd_check_sends(conn);
2210 /* schedule blocked rxs */
2211 kiblnd_handle_early_rxs(conn);
2213 kiblnd_conn_decref(conn);
2217 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2221 rc = rdma_reject(cmid, rej, sizeof(*rej));
2224 CWARN("Error %d sending reject\n", rc);
2228 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2230 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2231 kib_msg_t *reqmsg = priv;
2237 lnet_ni_t *ni = NULL;
2238 kib_net_t *net = NULL;
2240 struct rdma_conn_param cp;
2242 int version = IBLND_MSG_VERSION;
2243 unsigned long flags;
2245 struct sockaddr_in *peer_addr;
2246 LASSERT (!in_interrupt());
2248 /* cmid inherits 'context' from the corresponding listener id */
2249 ibdev = (kib_dev_t *)cmid->context;
2250 LASSERT (ibdev != NULL);
2252 memset(&rej, 0, sizeof(rej));
2253 rej.ibr_magic = IBLND_MSG_MAGIC;
2254 rej.ibr_why = IBLND_REJECT_FATAL;
2255 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2257 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2258 if (*kiblnd_tunables.kib_require_priv_port &&
2259 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2260 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2261 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2262 &ip, ntohs(peer_addr->sin_port));
2266 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2267 CERROR("Short connection request\n");
2271 /* Future protocol version compatibility support! If the
2272 * o2iblnd-specific protocol changes, or when LNET unifies
2273 * protocols over all LNDs, the initial connection will
2274 * negotiate a protocol version. I trap this here to avoid
2275 * console errors; the reject tells the peer which protocol I
2277 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2278 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2280 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2281 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2282 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2284 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2285 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2286 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2289 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2291 CERROR("Can't parse connection request: %d\n", rc);
2295 nid = reqmsg->ibm_srcnid;
2296 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2299 net = (kib_net_t *)ni->ni_data;
2300 rej.ibr_incarnation = net->ibn_incarnation;
2303 if (ni == NULL || /* no matching net */
2304 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2305 net->ibn_dev != ibdev) { /* wrong device */
2306 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2307 "bad dst nid %s\n", libcfs_nid2str(nid),
2308 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2309 ibdev->ibd_ifname, ibdev->ibd_nnets,
2311 libcfs_nid2str(reqmsg->ibm_dstnid));
2316 /* check time stamp as soon as possible */
2317 if (reqmsg->ibm_dststamp != 0 &&
2318 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2319 CWARN("Stale connection request\n");
2320 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2324 /* I can accept peer's version */
2325 version = reqmsg->ibm_version;
2327 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2328 CERROR("Unexpected connreq msg type: %x from %s\n",
2329 reqmsg->ibm_type, libcfs_nid2str(nid));
2333 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2334 IBLND_MSG_QUEUE_SIZE(version)) {
2335 CERROR("Can't accept conn from %s, queue depth too large: "
2336 " %d (<=%d wanted)\n",
2337 libcfs_nid2str(nid),
2338 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2339 IBLND_MSG_QUEUE_SIZE(version));
2341 if (version == IBLND_MSG_VERSION)
2342 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2347 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2348 IBLND_RDMA_FRAGS(version)) {
2349 CWARN("Can't accept conn from %s (version %x): "
2350 "max_frags %d too large (%d wanted)\n",
2351 libcfs_nid2str(nid), version,
2352 reqmsg->ibm_u.connparams.ibcp_max_frags,
2353 IBLND_RDMA_FRAGS(version));
2355 if (version >= IBLND_MSG_VERSION)
2356 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2359 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2360 IBLND_RDMA_FRAGS(version) && net->ibn_fmr_ps == NULL) {
2361 CWARN("Can't accept conn from %s (version %x): "
2362 "max_frags %d incompatible without FMR pool "
2364 libcfs_nid2str(nid), version,
2365 reqmsg->ibm_u.connparams.ibcp_max_frags,
2366 IBLND_RDMA_FRAGS(version));
2368 if (version >= IBLND_MSG_VERSION)
2369 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2374 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2375 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2376 libcfs_nid2str(nid),
2377 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2382 /* assume 'nid' is a new peer; create */
2383 rc = kiblnd_create_peer(ni, &peer, nid);
2385 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2386 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2390 /* We have validated the peer's parameters so use those */
2391 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2392 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2394 write_lock_irqsave(g_lock, flags);
2396 peer2 = kiblnd_find_peer_locked(nid);
2397 if (peer2 != NULL) {
2398 if (peer2->ibp_version == 0) {
2399 peer2->ibp_version = version;
2400 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2403 /* not the guy I've talked with */
2404 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2405 peer2->ibp_version != version) {
2406 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2408 if (kiblnd_peer_active(peer2)) {
2409 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2410 peer2->ibp_version = version;
2412 write_unlock_irqrestore(g_lock, flags);
2414 CWARN("Conn stale %s version %x/%x incarnation "LPU64"/"LPU64"\n",
2415 libcfs_nid2str(nid), peer2->ibp_version, version,
2416 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2418 kiblnd_peer_decref(peer);
2419 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2423 if (!kiblnd_peer_win_race(peer2, reqmsg)) {
2424 write_unlock_irqrestore(g_lock, flags);
2426 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2428 kiblnd_peer_decref(peer);
2429 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2433 * passive connection is allowed even this peer is waiting for
2436 peer2->ibp_reconnecting = 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);
2524 rej.ibr_version = version;
2525 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2526 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2527 kiblnd_reject(cmid, &rej);
2529 return -ECONNREFUSED;
2533 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2534 __u64 incarnation, int why, kib_connparams_t *cp)
2536 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2537 kib_peer_t *peer = conn->ibc_peer;
2539 int msg_size = IBLND_MSG_SIZE;
2543 unsigned long flags;
2545 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2546 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2547 LASSERT(!peer->ibp_reconnecting);
2550 msg_size = cp->ibcp_max_msg_size;
2551 frag_num = cp->ibcp_max_frags;
2552 queue_dep = cp->ibcp_queue_depth;
2555 write_lock_irqsave(glock, flags);
2556 /* retry connection if it's still needed and no other connection
2557 * attempts (active or passive) are in progress
2558 * NB: reconnect is still needed even when ibp_tx_queue is
2559 * empty if ibp_version != version because reconnect may be
2560 * initiated by kiblnd_query() */
2561 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2562 peer->ibp_version != version) &&
2563 peer->ibp_connecting == 1 &&
2564 peer->ibp_accepting == 0;
2575 case IBLND_REJECT_RDMA_FRAGS:
2577 reason = "can't negotiate max frags";
2580 if (*kiblnd_tunables.kib_map_on_demand == 0) {
2581 reason = "map_on_demand must be enabled";
2584 if (conn->ibc_max_frags <= frag_num) {
2585 reason = "unsupported max frags";
2589 peer->ibp_max_frags = frag_num;
2590 reason = "rdma fragments";
2593 case IBLND_REJECT_MSG_QUEUE_SIZE:
2595 reason = "can't negotiate queue depth";
2598 if (conn->ibc_queue_depth <= queue_dep) {
2599 reason = "unsupported queue depth";
2603 peer->ibp_queue_depth = queue_dep;
2604 reason = "queue depth";
2607 case IBLND_REJECT_CONN_STALE:
2611 case IBLND_REJECT_CONN_RACE:
2612 reason = "conn race";
2615 case IBLND_REJECT_CONN_UNCOMPAT:
2616 reason = "version negotiation";
2620 conn->ibc_reconnect = 1;
2621 peer->ibp_reconnecting = 1;
2622 peer->ibp_version = version;
2623 if (incarnation != 0)
2624 peer->ibp_incarnation = incarnation;
2626 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2628 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2629 libcfs_nid2str(peer->ibp_nid),
2630 reconnect ? "reconnect" : "don't reconnect",
2631 reason, IBLND_MSG_VERSION, version, msg_size,
2632 conn->ibc_queue_depth, queue_dep,
2633 conn->ibc_max_frags, frag_num);
2635 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2636 * while destroying the zombie
2641 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2643 kib_peer_t *peer = conn->ibc_peer;
2645 LASSERT (!in_interrupt());
2646 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2649 case IB_CM_REJ_STALE_CONN:
2650 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2651 IBLND_REJECT_CONN_STALE, NULL);
2654 case IB_CM_REJ_INVALID_SERVICE_ID:
2655 CNETERR("%s rejected: no listener at %d\n",
2656 libcfs_nid2str(peer->ibp_nid),
2657 *kiblnd_tunables.kib_service);
2660 case IB_CM_REJ_CONSUMER_DEFINED:
2661 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2662 kib_rej_t *rej = priv;
2663 kib_connparams_t *cp = NULL;
2665 __u64 incarnation = -1;
2667 /* NB. default incarnation is -1 because:
2668 * a) V1 will ignore dst incarnation in connreq.
2669 * b) V2 will provide incarnation while rejecting me,
2670 * -1 will be overwrote.
2672 * if I try to connect to a V1 peer with V2 protocol,
2673 * it rejected me then upgrade to V2, I have no idea
2674 * about the upgrading and try to reconnect with V1,
2675 * in this case upgraded V2 can find out I'm trying to
2676 * talk to the old guy and reject me(incarnation is -1).
2679 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2680 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2681 __swab32s(&rej->ibr_magic);
2682 __swab16s(&rej->ibr_version);
2686 if (priv_nob >= sizeof(kib_rej_t) &&
2687 rej->ibr_version > IBLND_MSG_VERSION_1) {
2688 /* priv_nob is always 148 in current version
2689 * of OFED, so we still need to check version.
2690 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2694 __swab64s(&rej->ibr_incarnation);
2695 __swab16s(&cp->ibcp_queue_depth);
2696 __swab16s(&cp->ibcp_max_frags);
2697 __swab32s(&cp->ibcp_max_msg_size);
2700 incarnation = rej->ibr_incarnation;
2703 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2704 rej->ibr_magic != LNET_PROTO_MAGIC) {
2705 CERROR("%s rejected: consumer defined fatal error\n",
2706 libcfs_nid2str(peer->ibp_nid));
2710 if (rej->ibr_version != IBLND_MSG_VERSION &&
2711 rej->ibr_version != IBLND_MSG_VERSION_1) {
2712 CERROR("%s rejected: o2iblnd version %x error\n",
2713 libcfs_nid2str(peer->ibp_nid),
2718 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2719 rej->ibr_version == IBLND_MSG_VERSION_1) {
2720 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2721 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2723 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2724 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2727 switch (rej->ibr_why) {
2728 case IBLND_REJECT_CONN_RACE:
2729 conn->ibc_connrace = 1;
2730 case IBLND_REJECT_CONN_STALE:
2731 case IBLND_REJECT_CONN_UNCOMPAT:
2732 case IBLND_REJECT_MSG_QUEUE_SIZE:
2733 case IBLND_REJECT_RDMA_FRAGS:
2734 kiblnd_check_reconnect(conn, rej->ibr_version,
2735 incarnation, rej->ibr_why, cp);
2738 case IBLND_REJECT_NO_RESOURCES:
2739 CERROR("%s rejected: o2iblnd no resources\n",
2740 libcfs_nid2str(peer->ibp_nid));
2743 case IBLND_REJECT_FATAL:
2744 CERROR("%s rejected: o2iblnd fatal error\n",
2745 libcfs_nid2str(peer->ibp_nid));
2749 CERROR("%s rejected: o2iblnd reason %d\n",
2750 libcfs_nid2str(peer->ibp_nid),
2758 CNETERR("%s rejected: reason %d, size %d\n",
2759 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2763 kiblnd_connreq_done(conn, -ECONNREFUSED);
2767 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2769 kib_peer_t *peer = conn->ibc_peer;
2770 lnet_ni_t *ni = peer->ibp_ni;
2771 kib_net_t *net = ni->ni_data;
2772 kib_msg_t *msg = priv;
2773 int ver = conn->ibc_version;
2774 int rc = kiblnd_unpack_msg(msg, priv_nob);
2775 unsigned long flags;
2777 LASSERT (net != NULL);
2780 CERROR("Can't unpack connack from %s: %d\n",
2781 libcfs_nid2str(peer->ibp_nid), rc);
2785 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2786 CERROR("Unexpected message %d from %s\n",
2787 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2792 if (ver != msg->ibm_version) {
2793 CERROR("%s replied version %x is different with "
2794 "requested version %x\n",
2795 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2800 if (msg->ibm_u.connparams.ibcp_queue_depth >
2801 conn->ibc_queue_depth) {
2802 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2803 libcfs_nid2str(peer->ibp_nid),
2804 msg->ibm_u.connparams.ibcp_queue_depth,
2805 conn->ibc_queue_depth);
2810 if (msg->ibm_u.connparams.ibcp_max_frags >
2811 conn->ibc_max_frags) {
2812 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2813 libcfs_nid2str(peer->ibp_nid),
2814 msg->ibm_u.connparams.ibcp_max_frags,
2815 conn->ibc_max_frags);
2820 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2821 CERROR("%s max message size %d too big (%d max)\n",
2822 libcfs_nid2str(peer->ibp_nid),
2823 msg->ibm_u.connparams.ibcp_max_msg_size,
2829 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2830 if (msg->ibm_dstnid == ni->ni_nid &&
2831 msg->ibm_dststamp == net->ibn_incarnation)
2835 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2838 CERROR("Bad connection reply from %s, rc = %d, "
2839 "version: %x max_frags: %d\n",
2840 libcfs_nid2str(peer->ibp_nid), rc,
2841 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2845 conn->ibc_incarnation = msg->ibm_srcstamp;
2846 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2847 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2848 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2849 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2850 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2851 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2853 kiblnd_connreq_done(conn, 0);
2857 /* NB My QP has already established itself, so I handle anything going
2858 * wrong here by setting ibc_comms_error.
2859 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2860 * immediately tears it down. */
2863 conn->ibc_comms_error = rc;
2864 kiblnd_connreq_done(conn, 0);
2868 kiblnd_active_connect (struct rdma_cm_id *cmid)
2870 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2873 struct rdma_conn_param cp;
2876 unsigned long flags;
2878 int connreq = IBLND_CONNREQ_NOOP;
2880 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2882 if (peer->ibp_connrace_win)
2883 connreq |= IBLND_CONNREQ_WIN_WISH;
2885 incarnation = peer->ibp_incarnation;
2886 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2888 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2890 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2893 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2894 kiblnd_peer_decref(peer); /* lose cmid's ref */
2898 /* conn "owns" cmid now, so I return success from here on to ensure the
2899 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2902 msg = &conn->ibc_connvars->cv_msg;
2904 memset(msg, 0, sizeof(*msg));
2905 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2906 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2907 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2908 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2910 kiblnd_pack_msg(peer->ibp_ni, msg, version, connreq,
2911 peer->ibp_nid, incarnation);
2913 memset(&cp, 0, sizeof(cp));
2914 cp.private_data = msg;
2915 cp.private_data_len = msg->ibm_nob;
2916 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2917 cp.initiator_depth = 0;
2918 cp.flow_control = 1;
2919 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2920 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2922 LASSERT(cmid->context == (void *)conn);
2923 LASSERT(conn->ibc_cmid == cmid);
2925 rc = rdma_connect(cmid, &cp);
2927 CERROR("Can't connect to %s: %d\n",
2928 libcfs_nid2str(peer->ibp_nid), rc);
2929 kiblnd_connreq_done(conn, rc);
2930 kiblnd_conn_decref(conn);
2937 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2943 switch (event->event) {
2945 CERROR("Unexpected event: %d, status: %d\n",
2946 event->event, event->status);
2949 case RDMA_CM_EVENT_CONNECT_REQUEST:
2950 /* destroy cmid on failure */
2951 rc = kiblnd_passive_connect(cmid,
2952 (void *)KIBLND_CONN_PARAM(event),
2953 KIBLND_CONN_PARAM_LEN(event));
2954 CDEBUG(D_NET, "connreq: %d\n", rc);
2957 case RDMA_CM_EVENT_ADDR_ERROR:
2958 peer = (kib_peer_t *)cmid->context;
2959 CNETERR("%s: ADDR ERROR %d\n",
2960 libcfs_nid2str(peer->ibp_nid), event->status);
2961 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2962 kiblnd_peer_decref(peer);
2963 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2965 case RDMA_CM_EVENT_ADDR_RESOLVED:
2966 peer = (kib_peer_t *)cmid->context;
2968 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2969 libcfs_nid2str(peer->ibp_nid), event->status);
2971 if (event->status != 0) {
2972 CNETERR("Can't resolve address for %s: %d\n",
2973 libcfs_nid2str(peer->ibp_nid), event->status);
2976 rc = rdma_resolve_route(
2977 cmid, *kiblnd_tunables.kib_timeout * 1000);
2980 /* Can't initiate route resolution */
2981 CERROR("Can't resolve route for %s: %d\n",
2982 libcfs_nid2str(peer->ibp_nid), rc);
2984 kiblnd_peer_connect_failed(peer, 1, rc);
2985 kiblnd_peer_decref(peer);
2986 return rc; /* rc != 0 destroys cmid */
2988 case RDMA_CM_EVENT_ROUTE_ERROR:
2989 peer = (kib_peer_t *)cmid->context;
2990 CNETERR("%s: ROUTE ERROR %d\n",
2991 libcfs_nid2str(peer->ibp_nid), event->status);
2992 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2993 kiblnd_peer_decref(peer);
2994 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2996 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2997 peer = (kib_peer_t *)cmid->context;
2998 CDEBUG(D_NET,"%s Route resolved: %d\n",
2999 libcfs_nid2str(peer->ibp_nid), event->status);
3001 if (event->status == 0)
3002 return kiblnd_active_connect(cmid);
3004 CNETERR("Can't resolve route for %s: %d\n",
3005 libcfs_nid2str(peer->ibp_nid), event->status);
3006 kiblnd_peer_connect_failed(peer, 1, event->status);
3007 kiblnd_peer_decref(peer);
3008 return event->status; /* rc != 0 destroys cmid */
3010 case RDMA_CM_EVENT_UNREACHABLE:
3011 conn = (kib_conn_t *)cmid->context;
3012 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3013 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3014 CNETERR("%s: UNREACHABLE %d\n",
3015 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3016 kiblnd_connreq_done(conn, -ENETDOWN);
3017 kiblnd_conn_decref(conn);
3020 case RDMA_CM_EVENT_CONNECT_ERROR:
3021 conn = (kib_conn_t *)cmid->context;
3022 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3023 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3024 CNETERR("%s: CONNECT ERROR %d\n",
3025 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3026 kiblnd_connreq_done(conn, -ENOTCONN);
3027 kiblnd_conn_decref(conn);
3030 case RDMA_CM_EVENT_REJECTED:
3031 conn = (kib_conn_t *)cmid->context;
3032 switch (conn->ibc_state) {
3036 case IBLND_CONN_PASSIVE_WAIT:
3037 CERROR ("%s: REJECTED %d\n",
3038 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3040 kiblnd_connreq_done(conn, -ECONNRESET);
3043 case IBLND_CONN_ACTIVE_CONNECT:
3044 kiblnd_rejected(conn, event->status,
3045 (void *)KIBLND_CONN_PARAM(event),
3046 KIBLND_CONN_PARAM_LEN(event));
3049 kiblnd_conn_decref(conn);
3052 case RDMA_CM_EVENT_ESTABLISHED:
3053 conn = (kib_conn_t *)cmid->context;
3054 switch (conn->ibc_state) {
3058 case IBLND_CONN_PASSIVE_WAIT:
3059 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3060 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3061 kiblnd_connreq_done(conn, 0);
3064 case IBLND_CONN_ACTIVE_CONNECT:
3065 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3066 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3067 kiblnd_check_connreply(conn,
3068 (void *)KIBLND_CONN_PARAM(event),
3069 KIBLND_CONN_PARAM_LEN(event));
3072 /* net keeps its ref on conn! */
3075 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3076 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3079 case RDMA_CM_EVENT_DISCONNECTED:
3080 conn = (kib_conn_t *)cmid->context;
3081 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3082 CERROR("%s DISCONNECTED\n",
3083 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3084 kiblnd_connreq_done(conn, -ECONNRESET);
3086 kiblnd_close_conn(conn, 0);
3088 kiblnd_conn_decref(conn);
3089 cmid->context = NULL;
3092 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3093 LCONSOLE_ERROR_MSG(0x131,
3094 "Received notification of device removal\n"
3095 "Please shutdown LNET to allow this to proceed\n");
3096 /* Can't remove network from underneath LNET for now, so I have
3100 case RDMA_CM_EVENT_ADDR_CHANGE:
3101 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3107 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3110 struct list_head *ttmp;
3112 list_for_each(ttmp, txs) {
3113 tx = list_entry(ttmp, kib_tx_t, tx_list);
3115 if (txs != &conn->ibc_active_txs) {
3116 LASSERT(tx->tx_queued);
3118 LASSERT(!tx->tx_queued);
3119 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3122 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3123 CERROR("Timed out tx: %s, %lu seconds\n",
3124 kiblnd_queue2str(conn, txs),
3125 cfs_duration_sec(jiffies - tx->tx_deadline));
3134 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3136 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3137 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3138 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3139 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3140 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3144 kiblnd_check_conns (int idx)
3146 struct list_head closes = LIST_HEAD_INIT(closes);
3147 struct list_head checksends = LIST_HEAD_INIT(checksends);
3148 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3149 struct list_head *ptmp;
3152 struct list_head *ctmp;
3153 unsigned long flags;
3155 /* NB. We expect to have a look at all the peers and not find any
3156 * RDMAs to time out, so we just use a shared lock while we
3158 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3160 list_for_each(ptmp, peers) {
3161 peer = list_entry(ptmp, kib_peer_t, ibp_list);
3163 list_for_each(ctmp, &peer->ibp_conns) {
3167 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3169 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3171 spin_lock(&conn->ibc_lock);
3173 sendnoop = kiblnd_need_noop(conn);
3174 timedout = kiblnd_conn_timed_out_locked(conn);
3175 if (!sendnoop && !timedout) {
3176 spin_unlock(&conn->ibc_lock);
3181 CERROR("Timed out RDMA with %s (%lu): "
3182 "c: %u, oc: %u, rc: %u\n",
3183 libcfs_nid2str(peer->ibp_nid),
3184 cfs_duration_sec(cfs_time_current() -
3185 peer->ibp_last_alive),
3187 conn->ibc_outstanding_credits,
3188 conn->ibc_reserved_credits);
3189 list_add(&conn->ibc_connd_list, &closes);
3191 list_add(&conn->ibc_connd_list, &checksends);
3193 /* +ref for 'closes' or 'checksends' */
3194 kiblnd_conn_addref(conn);
3196 spin_unlock(&conn->ibc_lock);
3200 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3202 /* Handle timeout by closing the whole
3203 * connection. We can only be sure RDMA activity
3204 * has ceased once the QP has been modified. */
3205 while (!list_empty(&closes)) {
3206 conn = list_entry(closes.next,
3207 kib_conn_t, ibc_connd_list);
3208 list_del(&conn->ibc_connd_list);
3209 kiblnd_close_conn(conn, -ETIMEDOUT);
3210 kiblnd_conn_decref(conn);
3213 /* In case we have enough credits to return via a
3214 * NOOP, but there were no non-blocking tx descs
3215 * free to do it last time... */
3216 while (!list_empty(&checksends)) {
3217 conn = list_entry(checksends.next,
3218 kib_conn_t, ibc_connd_list);
3219 list_del(&conn->ibc_connd_list);
3220 kiblnd_check_sends(conn);
3221 kiblnd_conn_decref(conn);
3226 kiblnd_disconnect_conn (kib_conn_t *conn)
3228 LASSERT (!in_interrupt());
3229 LASSERT (current == kiblnd_data.kib_connd);
3230 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3232 rdma_disconnect(conn->ibc_cmid);
3233 kiblnd_finalise_conn(conn);
3235 kiblnd_peer_notify(conn->ibc_peer);
3239 * High-water for reconnection to the same peer, reconnection attempt should
3240 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3242 #define KIB_RECONN_HIGH_RACE 10
3244 * Allow connd to take a break and handle other things after consecutive
3245 * reconnection attemps.
3247 #define KIB_RECONN_BREAK 100
3250 kiblnd_connd (void *arg)
3252 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3254 unsigned long flags;
3260 unsigned long deadline = jiffies;
3262 cfs_block_allsigs();
3264 init_waitqueue_entry(&wait, current);
3265 kiblnd_data.kib_connd = current;
3267 spin_lock_irqsave(lock, flags);
3269 while (!kiblnd_data.kib_shutdown) {
3274 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3275 kib_peer_t *peer = NULL;
3277 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3278 kib_conn_t, ibc_list);
3279 list_del(&conn->ibc_list);
3280 if (conn->ibc_reconnect) {
3281 peer = conn->ibc_peer;
3282 kiblnd_peer_addref(peer);
3285 spin_unlock_irqrestore(lock, flags);
3288 kiblnd_destroy_conn(conn, !peer);
3290 spin_lock_irqsave(lock, flags);
3294 conn->ibc_peer = peer;
3295 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE) {
3296 /* reset ibc_connrace because it is still too
3297 * early to break the normal connrace protocol
3299 conn->ibc_connrace = 0;
3300 list_add_tail(&conn->ibc_list,
3301 &kiblnd_data.kib_reconn_list);
3303 /* want to win the next connrace, don't reset
3304 * conn->ibc_connrace so kiblnd_reconnect_peer
3305 * can see the win wish.
3307 list_add_tail(&conn->ibc_list,
3308 &kiblnd_data.kib_reconn_wait);
3312 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3313 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3314 kib_conn_t, ibc_list);
3315 list_del(&conn->ibc_list);
3317 spin_unlock_irqrestore(lock, flags);
3320 kiblnd_disconnect_conn(conn);
3321 kiblnd_conn_decref(conn);
3323 spin_lock_irqsave(lock, flags);
3326 while (reconn < KIB_RECONN_BREAK) {
3327 if (kiblnd_data.kib_reconn_sec != get_seconds()) {
3328 kiblnd_data.kib_reconn_sec = get_seconds();
3329 list_splice_init(&kiblnd_data.kib_reconn_wait,
3330 &kiblnd_data.kib_reconn_list);
3333 if (list_empty(&kiblnd_data.kib_reconn_list))
3336 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3337 kib_conn_t, ibc_list);
3338 list_del(&conn->ibc_list);
3340 spin_unlock_irqrestore(lock, flags);
3343 reconn += kiblnd_reconnect_peer(conn->ibc_peer,
3344 conn->ibc_connrace);
3345 kiblnd_peer_decref(conn->ibc_peer);
3346 LIBCFS_FREE(conn, sizeof(*conn));
3348 spin_lock_irqsave(lock, flags);
3351 /* careful with the jiffy wrap... */
3352 timeout = (int)(deadline - jiffies);
3356 int chunk = kiblnd_data.kib_peer_hash_size;
3358 spin_unlock_irqrestore(lock, flags);
3361 /* Time to check for RDMA timeouts on a few more
3362 * peers: I do checks every 'p' seconds on a
3363 * proportion of the peer table and I need to check
3364 * every connection 'n' times within a timeout
3365 * interval, to ensure I detect a timeout on any
3366 * connection within (n+1)/n times the timeout
3369 if (*kiblnd_tunables.kib_timeout > n * p)
3370 chunk = (chunk * n * p) /
3371 *kiblnd_tunables.kib_timeout;
3375 for (i = 0; i < chunk; i++) {
3376 kiblnd_check_conns(peer_index);
3377 peer_index = (peer_index + 1) %
3378 kiblnd_data.kib_peer_hash_size;
3381 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3382 spin_lock_irqsave(lock, flags);
3388 /* Nothing to do for 'timeout' */
3389 set_current_state(TASK_INTERRUPTIBLE);
3390 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3391 spin_unlock_irqrestore(lock, flags);
3393 schedule_timeout(timeout);
3395 set_current_state(TASK_RUNNING);
3396 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3397 spin_lock_irqsave(lock, flags);
3400 spin_unlock_irqrestore(lock, flags);
3402 kiblnd_thread_fini();
3407 kiblnd_qp_event(struct ib_event *event, void *arg)
3409 kib_conn_t *conn = arg;
3411 switch (event->event) {
3412 case IB_EVENT_COMM_EST:
3413 CDEBUG(D_NET, "%s established\n",
3414 libcfs_nid2str(conn->ibc_peer->ibp_nid));
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)) {
3431 case IBLND_WID_RDMA:
3432 /* We only get RDMA completion notification if it fails. All
3433 * subsequent work items, including the final SEND will fail
3434 * too. However we can't print out any more info about the
3435 * failing RDMA because 'tx' might be back on the idle list or
3436 * even reused already if we didn't manage to post all our work
3438 CNETERR("RDMA (tx: %p) failed: %d\n",
3439 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3443 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3447 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3454 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3456 /* NB I'm not allowed to schedule this conn once its refcount has
3457 * reached 0. Since fundamentally I'm racing with scheduler threads
3458 * consuming my CQ I could be called after all completions have
3459 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3460 * and this CQ is about to be destroyed so I NOOP. */
3461 kib_conn_t *conn = (kib_conn_t *)arg;
3462 struct kib_sched_info *sched = conn->ibc_sched;
3463 unsigned long flags;
3465 LASSERT(cq == conn->ibc_cq);
3467 spin_lock_irqsave(&sched->ibs_lock, flags);
3469 conn->ibc_ready = 1;
3471 if (!conn->ibc_scheduled &&
3472 (conn->ibc_nrx > 0 ||
3473 conn->ibc_nsends_posted > 0)) {
3474 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3475 conn->ibc_scheduled = 1;
3476 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3478 if (waitqueue_active(&sched->ibs_waitq))
3479 wake_up(&sched->ibs_waitq);
3482 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3486 kiblnd_cq_event(struct ib_event *event, void *arg)
3488 kib_conn_t *conn = arg;
3490 CERROR("%s: async CQ event type %d\n",
3491 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3495 kiblnd_scheduler(void *arg)
3497 long id = (long)arg;
3498 struct kib_sched_info *sched;
3501 unsigned long flags;
3507 cfs_block_allsigs();
3509 init_waitqueue_entry(&wait, current);
3511 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3513 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3515 CWARN("Failed to bind on CPT %d, please verify whether "
3516 "all CPUs are healthy and reload modules if necessary, "
3517 "otherwise your system might under risk of low "
3518 "performance\n", sched->ibs_cpt);
3521 spin_lock_irqsave(&sched->ibs_lock, flags);
3523 while (!kiblnd_data.kib_shutdown) {
3524 if (busy_loops++ >= IBLND_RESCHED) {
3525 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3530 spin_lock_irqsave(&sched->ibs_lock, flags);
3535 if (!list_empty(&sched->ibs_conns)) {
3536 conn = list_entry(sched->ibs_conns.next,
3537 kib_conn_t, ibc_sched_list);
3538 /* take over kib_sched_conns' ref on conn... */
3539 LASSERT(conn->ibc_scheduled);
3540 list_del(&conn->ibc_sched_list);
3541 conn->ibc_ready = 0;
3543 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3545 wc.wr_id = IBLND_WID_INVAL;
3547 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3549 rc = ib_req_notify_cq(conn->ibc_cq,
3552 CWARN("%s: ib_req_notify_cq failed: %d, "
3553 "closing connection\n",
3554 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3555 kiblnd_close_conn(conn, -EIO);
3556 kiblnd_conn_decref(conn);
3557 spin_lock_irqsave(&sched->ibs_lock,
3562 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3565 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3567 "ib_poll_cq (rc: %d) returned invalid "
3568 "wr_id, opcode %d, status: %d, "
3569 "vendor_err: %d, conn: %s status: %d\n"
3570 "please upgrade firmware and OFED or "
3571 "contact vendor.\n", rc,
3572 wc.opcode, wc.status, wc.vendor_err,
3573 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3579 CWARN("%s: ib_poll_cq failed: %d, "
3580 "closing connection\n",
3581 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3583 kiblnd_close_conn(conn, -EIO);
3584 kiblnd_conn_decref(conn);
3585 spin_lock_irqsave(&sched->ibs_lock, flags);
3589 spin_lock_irqsave(&sched->ibs_lock, flags);
3591 if (rc != 0 || conn->ibc_ready) {
3592 /* There may be another completion waiting; get
3593 * another scheduler to check while I handle
3595 /* +1 ref for sched_conns */
3596 kiblnd_conn_addref(conn);
3597 list_add_tail(&conn->ibc_sched_list,
3599 if (waitqueue_active(&sched->ibs_waitq))
3600 wake_up(&sched->ibs_waitq);
3602 conn->ibc_scheduled = 0;
3606 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3607 kiblnd_complete(&wc);
3609 spin_lock_irqsave(&sched->ibs_lock, flags);
3612 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3619 set_current_state(TASK_INTERRUPTIBLE);
3620 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3621 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3626 remove_wait_queue(&sched->ibs_waitq, &wait);
3627 set_current_state(TASK_RUNNING);
3628 spin_lock_irqsave(&sched->ibs_lock, flags);
3631 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3633 kiblnd_thread_fini();
3638 kiblnd_failover_thread(void *arg)
3640 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3643 unsigned long flags;
3646 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3648 cfs_block_allsigs();
3650 init_waitqueue_entry(&wait, current);
3651 write_lock_irqsave(glock, flags);
3653 while (!kiblnd_data.kib_shutdown) {
3654 int do_failover = 0;
3657 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3659 if (cfs_time_before(cfs_time_current(),
3660 dev->ibd_next_failover))
3667 list_del_init(&dev->ibd_fail_list);
3668 dev->ibd_failover = 1;
3669 write_unlock_irqrestore(glock, flags);
3671 rc = kiblnd_dev_failover(dev);
3673 write_lock_irqsave(glock, flags);
3675 LASSERT (dev->ibd_failover);
3676 dev->ibd_failover = 0;
3677 if (rc >= 0) { /* Device is OK or failover succeed */
3678 dev->ibd_next_failover = cfs_time_shift(3);
3682 /* failed to failover, retry later */
3683 dev->ibd_next_failover =
3684 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3685 if (kiblnd_dev_can_failover(dev)) {
3686 list_add_tail(&dev->ibd_fail_list,
3687 &kiblnd_data.kib_failed_devs);
3693 /* long sleep if no more pending failover */
3694 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3696 set_current_state(TASK_INTERRUPTIBLE);
3697 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3698 write_unlock_irqrestore(glock, flags);
3700 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3701 cfs_time_seconds(1));
3702 set_current_state(TASK_RUNNING);
3703 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3704 write_lock_irqsave(glock, flags);
3706 if (!long_sleep || rc != 0)
3709 /* have a long sleep, routine check all active devices,
3710 * we need checking like this because if there is not active
3711 * connection on the dev and no SEND from local, we may listen
3712 * on wrong HCA for ever while there is a bonding failover */
3713 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3714 if (kiblnd_dev_can_failover(dev)) {
3715 list_add_tail(&dev->ibd_fail_list,
3716 &kiblnd_data.kib_failed_devs);
3721 write_unlock_irqrestore(glock, flags);
3723 kiblnd_thread_fini();