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, __u32 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, nob, 0, (rd != tx->tx_rd),
595 CERROR("Can't map %d pages: %d\n", npages, rc);
599 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
601 rd->rd_key = tx->fmr.fmr_key;
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)
617 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
619 if (tx->tx_nfrags != 0) {
620 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
621 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
627 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
629 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
630 kib_net_t *net = ni->ni_data;
631 struct ib_mr *mr = NULL;
635 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
637 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
638 tx->tx_nfrags = nfrags;
640 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
641 tx->tx_nfrags, tx->tx_dmadir);
643 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
644 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
645 hdev->ibh_ibdev, &tx->tx_frags[i]);
646 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
647 hdev->ibh_ibdev, &tx->tx_frags[i]);
648 nob += rd->rd_frags[i].rf_nob;
651 mr = kiblnd_find_rd_dma_mr(hdev, rd,
652 (tx->tx_conn != NULL) ?
653 tx->tx_conn->ibc_max_frags : -1);
655 /* found pre-mapping MR */
656 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
660 if (net->ibn_fmr_ps != NULL)
661 return kiblnd_fmr_map_tx(net, tx, rd, nob);
668 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
669 unsigned int niov, struct kvec *iov, int offset, int nob)
671 kib_net_t *net = ni->ni_data;
673 struct scatterlist *sg;
680 LASSERT (net != NULL);
682 while (offset >= iov->iov_len) {
683 offset -= iov->iov_len;
693 vaddr = ((unsigned long)iov->iov_base) + offset;
694 page_offset = vaddr & (PAGE_SIZE - 1);
695 page = kiblnd_kvaddr_to_page(vaddr);
697 CERROR ("Can't find page\n");
701 fragnob = min((int)(iov->iov_len - offset), nob);
702 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
704 sg_set_page(sg, page, fragnob, page_offset);
707 if (offset + fragnob < iov->iov_len) {
717 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
721 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
722 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
724 kib_net_t *net = ni->ni_data;
725 struct scatterlist *sg;
728 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
732 LASSERT (net != NULL);
734 while (offset >= kiov->kiov_len) {
735 offset -= kiov->kiov_len;
745 fragnob = min((int)(kiov->kiov_len - offset), nob);
747 sg_set_page(sg, kiov->kiov_page, fragnob,
748 kiov->kiov_offset + offset);
757 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
761 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
762 __must_hold(&conn->ibc_lock)
764 kib_msg_t *msg = tx->tx_msg;
765 kib_peer_t *peer = conn->ibc_peer;
766 int ver = conn->ibc_version;
770 LASSERT(tx->tx_queued);
771 /* We rely on this for QP sizing */
772 LASSERT(tx->tx_nwrq > 0);
773 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
775 LASSERT(credit == 0 || credit == 1);
776 LASSERT(conn->ibc_outstanding_credits >= 0);
777 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
778 LASSERT(conn->ibc_credits >= 0);
779 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
781 if (conn->ibc_nsends_posted == IBLND_CONCURRENT_SENDS(ver)) {
782 /* tx completions outstanding... */
783 CDEBUG(D_NET, "%s: posted enough\n",
784 libcfs_nid2str(peer->ibp_nid));
788 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
789 CDEBUG(D_NET, "%s: no credits\n",
790 libcfs_nid2str(peer->ibp_nid));
794 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
795 conn->ibc_credits == 1 && /* last credit reserved */
796 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
797 CDEBUG(D_NET, "%s: not using last credit\n",
798 libcfs_nid2str(peer->ibp_nid));
802 /* NB don't drop ibc_lock before bumping tx_sending */
803 list_del(&tx->tx_list);
806 if (msg->ibm_type == IBLND_MSG_NOOP &&
807 (!kiblnd_need_noop(conn) || /* redundant NOOP */
808 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
809 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
810 /* OK to drop when posted enough NOOPs, since
811 * kiblnd_check_sends will queue NOOP again when
812 * posted NOOPs complete */
813 spin_unlock(&conn->ibc_lock);
814 kiblnd_tx_done(peer->ibp_ni, tx);
815 spin_lock(&conn->ibc_lock);
816 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
817 libcfs_nid2str(peer->ibp_nid),
818 conn->ibc_noops_posted);
822 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
823 peer->ibp_nid, conn->ibc_incarnation);
825 conn->ibc_credits -= credit;
826 conn->ibc_outstanding_credits = 0;
827 conn->ibc_nsends_posted++;
828 if (msg->ibm_type == IBLND_MSG_NOOP)
829 conn->ibc_noops_posted++;
831 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
832 * PUT. If so, it was first queued here as a PUT_REQ, sent and
833 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
834 * and then re-queued here. It's (just) possible that
835 * tx_sending is non-zero if we've not done the tx_complete()
836 * from the first send; hence the ++ rather than = below. */
838 list_add(&tx->tx_list, &conn->ibc_active_txs);
840 /* I'm still holding ibc_lock! */
841 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
843 } else if (tx->tx_pool->tpo_pool.po_failed ||
844 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
845 /* close_conn will launch failover */
848 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
849 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1];
850 struct ib_send_wr *wrq = tx->tx_wrq;
853 if (!frd->frd_valid) {
854 wrq = &frd->frd_inv_wr;
855 wrq->next = &frd->frd_fastreg_wr;
857 wrq = &frd->frd_fastreg_wr;
859 frd->frd_fastreg_wr.next = tx->tx_wrq;
862 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
863 "bad wr_id "LPX64", opc %d, flags %d, peer: %s\n",
864 bad->wr_id, bad->opcode, bad->send_flags,
865 libcfs_nid2str(conn->ibc_peer->ibp_nid));
867 rc = ib_post_send(conn->ibc_cmid->qp, wrq, &bad);
870 conn->ibc_last_send = jiffies;
875 /* NB credits are transferred in the actual
876 * message, which can only be the last work item */
877 conn->ibc_credits += credit;
878 conn->ibc_outstanding_credits += msg->ibm_credits;
879 conn->ibc_nsends_posted--;
880 if (msg->ibm_type == IBLND_MSG_NOOP)
881 conn->ibc_noops_posted--;
887 done = (tx->tx_sending == 0);
889 list_del(&tx->tx_list);
891 spin_unlock(&conn->ibc_lock);
893 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
894 CERROR("Error %d posting transmit to %s\n",
895 rc, libcfs_nid2str(peer->ibp_nid));
897 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
898 rc, libcfs_nid2str(peer->ibp_nid));
900 kiblnd_close_conn(conn, rc);
903 kiblnd_tx_done(peer->ibp_ni, tx);
905 spin_lock(&conn->ibc_lock);
911 kiblnd_check_sends (kib_conn_t *conn)
913 int ver = conn->ibc_version;
914 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
917 /* Don't send anything until after the connection is established */
918 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
919 CDEBUG(D_NET, "%s too soon\n",
920 libcfs_nid2str(conn->ibc_peer->ibp_nid));
924 spin_lock(&conn->ibc_lock);
926 LASSERT (conn->ibc_nsends_posted <= IBLND_CONCURRENT_SENDS(ver));
927 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
928 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
929 LASSERT (conn->ibc_reserved_credits >= 0);
931 while (conn->ibc_reserved_credits > 0 &&
932 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
933 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
935 list_del(&tx->tx_list);
936 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
937 conn->ibc_reserved_credits--;
940 if (kiblnd_need_noop(conn)) {
941 spin_unlock(&conn->ibc_lock);
943 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
945 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
947 spin_lock(&conn->ibc_lock);
949 kiblnd_queue_tx_locked(tx, conn);
955 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
957 tx = list_entry(conn->ibc_tx_queue_nocred.next,
959 } else if (!list_empty(&conn->ibc_tx_noops)) {
960 LASSERT (!IBLND_OOB_CAPABLE(ver));
962 tx = list_entry(conn->ibc_tx_noops.next,
964 } else if (!list_empty(&conn->ibc_tx_queue)) {
966 tx = list_entry(conn->ibc_tx_queue.next,
971 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
975 spin_unlock(&conn->ibc_lock);
979 kiblnd_tx_complete (kib_tx_t *tx, int status)
981 int failed = (status != IB_WC_SUCCESS);
982 kib_conn_t *conn = tx->tx_conn;
985 LASSERT (tx->tx_sending > 0);
988 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
989 CNETERR("Tx -> %s cookie "LPX64
990 " sending %d waiting %d: failed %d\n",
991 libcfs_nid2str(conn->ibc_peer->ibp_nid),
992 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
995 kiblnd_close_conn(conn, -EIO);
997 kiblnd_peer_alive(conn->ibc_peer);
1000 spin_lock(&conn->ibc_lock);
1002 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1003 * gets to free it, which also drops its ref on 'conn'. */
1006 conn->ibc_nsends_posted--;
1007 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1008 conn->ibc_noops_posted--;
1011 tx->tx_waiting = 0; /* don't wait for peer */
1012 tx->tx_status = -EIO;
1015 idle = (tx->tx_sending == 0) && /* This is the final callback */
1016 !tx->tx_waiting && /* Not waiting for peer */
1017 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1019 list_del(&tx->tx_list);
1021 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1023 spin_unlock(&conn->ibc_lock);
1026 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1028 kiblnd_check_sends(conn);
1030 kiblnd_conn_decref(conn); /* ...until here */
1034 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1036 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1037 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1038 struct ib_send_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1039 int nob = offsetof (kib_msg_t, ibm_u) + body_nob;
1040 struct ib_mr *mr = hdev->ibh_mrs;
1042 LASSERT(tx->tx_nwrq >= 0);
1043 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1044 LASSERT(nob <= IBLND_MSG_SIZE);
1045 LASSERT(mr != NULL);
1047 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1049 sge->lkey = mr->lkey;
1050 sge->addr = tx->tx_msgaddr;
1053 memset(wrq, 0, sizeof(*wrq));
1056 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1059 wrq->opcode = IB_WR_SEND;
1060 wrq->send_flags = IB_SEND_SIGNALED;
1066 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1067 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1069 kib_msg_t *ibmsg = tx->tx_msg;
1070 kib_rdma_desc_t *srcrd = tx->tx_rd;
1071 struct ib_sge *sge = &tx->tx_sge[0];
1072 struct ib_send_wr *wrq = &tx->tx_wrq[0];
1078 LASSERT (!in_interrupt());
1079 LASSERT (tx->tx_nwrq == 0);
1080 LASSERT (type == IBLND_MSG_GET_DONE ||
1081 type == IBLND_MSG_PUT_DONE);
1083 srcidx = dstidx = 0;
1086 if (srcidx >= srcrd->rd_nfrags) {
1087 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1092 if (dstidx == dstrd->rd_nfrags) {
1093 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1098 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1099 CERROR("RDMA has too many fragments for peer %s (%d), "
1100 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1101 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1102 conn->ibc_max_frags,
1103 srcidx, srcrd->rd_nfrags,
1104 dstidx, dstrd->rd_nfrags);
1109 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1110 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1112 sge = &tx->tx_sge[tx->tx_nwrq];
1113 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1114 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1115 sge->length = wrknob;
1117 wrq = &tx->tx_wrq[tx->tx_nwrq];
1119 wrq->next = wrq + 1;
1120 wrq->wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1123 wrq->opcode = IB_WR_RDMA_WRITE;
1124 wrq->send_flags = 0;
1126 wrq->wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1127 wrq->wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1129 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1130 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1139 if (rc < 0) /* no RDMA if completing with failure */
1142 ibmsg->ibm_u.completion.ibcm_status = rc;
1143 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1144 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1145 type, sizeof (kib_completion_msg_t));
1151 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1153 struct list_head *q;
1155 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1156 LASSERT(!tx->tx_queued); /* not queued for sending already */
1157 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1160 tx->tx_deadline = jiffies +
1161 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1164 if (tx->tx_conn == NULL) {
1165 kiblnd_conn_addref(conn);
1167 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1169 /* PUT_DONE first attached to conn as a PUT_REQ */
1170 LASSERT (tx->tx_conn == conn);
1171 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1174 switch (tx->tx_msg->ibm_type) {
1178 case IBLND_MSG_PUT_REQ:
1179 case IBLND_MSG_GET_REQ:
1180 q = &conn->ibc_tx_queue_rsrvd;
1183 case IBLND_MSG_PUT_NAK:
1184 case IBLND_MSG_PUT_ACK:
1185 case IBLND_MSG_PUT_DONE:
1186 case IBLND_MSG_GET_DONE:
1187 q = &conn->ibc_tx_queue_nocred;
1190 case IBLND_MSG_NOOP:
1191 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1192 q = &conn->ibc_tx_queue_nocred;
1194 q = &conn->ibc_tx_noops;
1197 case IBLND_MSG_IMMEDIATE:
1198 q = &conn->ibc_tx_queue;
1202 list_add_tail(&tx->tx_list, q);
1206 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1208 spin_lock(&conn->ibc_lock);
1209 kiblnd_queue_tx_locked(tx, conn);
1210 spin_unlock(&conn->ibc_lock);
1212 kiblnd_check_sends(conn);
1215 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1216 struct sockaddr_in *srcaddr,
1217 struct sockaddr_in *dstaddr,
1220 unsigned short port;
1223 /* allow the port to be reused */
1224 rc = rdma_set_reuseaddr(cmid, 1);
1226 CERROR("Unable to set reuse on cmid: %d\n", rc);
1230 /* look for a free privileged port */
1231 for (port = PROT_SOCK-1; port > 0; port--) {
1232 srcaddr->sin_port = htons(port);
1233 rc = rdma_resolve_addr(cmid,
1234 (struct sockaddr *)srcaddr,
1235 (struct sockaddr *)dstaddr,
1238 CDEBUG(D_NET, "bound to port %hu\n", port);
1240 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1241 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1248 CERROR("Failed to bind to a free privileged port\n");
1253 kiblnd_connect_peer (kib_peer_t *peer)
1255 struct rdma_cm_id *cmid;
1257 kib_net_t *net = peer->ibp_ni->ni_data;
1258 struct sockaddr_in srcaddr;
1259 struct sockaddr_in dstaddr;
1262 LASSERT (net != NULL);
1263 LASSERT (peer->ibp_connecting > 0);
1264 LASSERT(!peer->ibp_reconnecting);
1266 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1270 CERROR("Can't create CMID for %s: %ld\n",
1271 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1277 memset(&srcaddr, 0, sizeof(srcaddr));
1278 srcaddr.sin_family = AF_INET;
1279 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1281 memset(&dstaddr, 0, sizeof(dstaddr));
1282 dstaddr.sin_family = AF_INET;
1283 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1284 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1286 kiblnd_peer_addref(peer); /* cmid's ref */
1288 if (*kiblnd_tunables.kib_use_priv_port) {
1289 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1290 *kiblnd_tunables.kib_timeout * 1000);
1292 rc = rdma_resolve_addr(cmid,
1293 (struct sockaddr *)&srcaddr,
1294 (struct sockaddr *)&dstaddr,
1295 *kiblnd_tunables.kib_timeout * 1000);
1298 /* Can't initiate address resolution: */
1299 CERROR("Can't resolve addr for %s: %d\n",
1300 libcfs_nid2str(peer->ibp_nid), rc);
1304 LASSERT (cmid->device != NULL);
1305 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1306 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1307 &dev->ibd_ifip, cmid->device->name);
1312 kiblnd_peer_connect_failed(peer, 1, rc);
1313 kiblnd_peer_decref(peer); /* cmid's ref */
1314 rdma_destroy_id(cmid);
1317 kiblnd_peer_connect_failed(peer, 1, rc);
1321 kiblnd_reconnect_peer(kib_peer_t *peer)
1323 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1324 char *reason = NULL;
1325 struct list_head txs;
1326 unsigned long flags;
1328 INIT_LIST_HEAD(&txs);
1330 write_lock_irqsave(glock, flags);
1331 if (peer->ibp_reconnecting == 0) {
1332 if (peer->ibp_accepting)
1333 reason = "accepting";
1334 else if (peer->ibp_connecting)
1335 reason = "connecting";
1336 else if (!list_empty(&peer->ibp_conns))
1337 reason = "connected";
1338 else /* connected then closed */
1344 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1345 list_empty(&peer->ibp_conns));
1346 peer->ibp_reconnecting = 0;
1348 if (!kiblnd_peer_active(peer)) {
1349 list_splice_init(&peer->ibp_tx_queue, &txs);
1350 reason = "unlinked";
1354 peer->ibp_connecting++;
1355 peer->ibp_reconnected++;
1356 write_unlock_irqrestore(glock, flags);
1358 kiblnd_connect_peer(peer);
1362 write_unlock_irqrestore(glock, flags);
1364 CWARN("Abort reconnection of %s: %s\n",
1365 libcfs_nid2str(peer->ibp_nid), reason);
1366 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1371 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1376 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1377 unsigned long flags;
1380 /* If I get here, I've committed to send, so I complete the tx with
1381 * failure on any problems */
1383 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1384 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1386 /* First time, just use a read lock since I expect to find my peer
1388 read_lock_irqsave(g_lock, flags);
1390 peer = kiblnd_find_peer_locked(nid);
1391 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1392 /* Found a peer with an established connection */
1393 conn = kiblnd_get_conn_locked(peer);
1394 kiblnd_conn_addref(conn); /* 1 ref for me... */
1396 read_unlock_irqrestore(g_lock, flags);
1399 kiblnd_queue_tx(tx, conn);
1400 kiblnd_conn_decref(conn); /* ...to here */
1404 read_unlock(g_lock);
1405 /* Re-try with a write lock */
1408 peer = kiblnd_find_peer_locked(nid);
1410 if (list_empty(&peer->ibp_conns)) {
1411 /* found a peer, but it's still connecting... */
1412 LASSERT(kiblnd_peer_connecting(peer));
1414 list_add_tail(&tx->tx_list,
1415 &peer->ibp_tx_queue);
1416 write_unlock_irqrestore(g_lock, flags);
1418 conn = kiblnd_get_conn_locked(peer);
1419 kiblnd_conn_addref(conn); /* 1 ref for me... */
1421 write_unlock_irqrestore(g_lock, flags);
1424 kiblnd_queue_tx(tx, conn);
1425 kiblnd_conn_decref(conn); /* ...to here */
1430 write_unlock_irqrestore(g_lock, flags);
1432 /* Allocate a peer ready to add to the peer table and retry */
1433 rc = kiblnd_create_peer(ni, &peer, nid);
1435 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1437 tx->tx_status = -EHOSTUNREACH;
1439 kiblnd_tx_done(ni, tx);
1444 write_lock_irqsave(g_lock, flags);
1446 peer2 = kiblnd_find_peer_locked(nid);
1447 if (peer2 != NULL) {
1448 if (list_empty(&peer2->ibp_conns)) {
1449 /* found a peer, but it's still connecting... */
1450 LASSERT(kiblnd_peer_connecting(peer2));
1452 list_add_tail(&tx->tx_list,
1453 &peer2->ibp_tx_queue);
1454 write_unlock_irqrestore(g_lock, flags);
1456 conn = kiblnd_get_conn_locked(peer2);
1457 kiblnd_conn_addref(conn); /* 1 ref for me... */
1459 write_unlock_irqrestore(g_lock, flags);
1462 kiblnd_queue_tx(tx, conn);
1463 kiblnd_conn_decref(conn); /* ...to here */
1466 kiblnd_peer_decref(peer);
1470 /* Brand new peer */
1471 LASSERT (peer->ibp_connecting == 0);
1472 peer->ibp_connecting = 1;
1474 /* always called with a ref on ni, which prevents ni being shutdown */
1475 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1478 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1480 kiblnd_peer_addref(peer);
1481 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1483 write_unlock_irqrestore(g_lock, flags);
1485 kiblnd_connect_peer(peer);
1486 kiblnd_peer_decref(peer);
1490 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1492 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1493 int type = lntmsg->msg_type;
1494 lnet_process_id_t target = lntmsg->msg_target;
1495 int target_is_router = lntmsg->msg_target_is_router;
1496 int routing = lntmsg->msg_routing;
1497 unsigned int payload_niov = lntmsg->msg_niov;
1498 struct kvec *payload_iov = lntmsg->msg_iov;
1499 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1500 unsigned int payload_offset = lntmsg->msg_offset;
1501 unsigned int payload_nob = lntmsg->msg_len;
1503 kib_rdma_desc_t *rd;
1508 /* NB 'private' is different depending on what we're sending.... */
1510 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1511 payload_nob, payload_niov, libcfs_id2str(target));
1513 LASSERT (payload_nob == 0 || payload_niov > 0);
1514 LASSERT (payload_niov <= LNET_MAX_IOV);
1516 /* Thread context */
1517 LASSERT (!in_interrupt());
1518 /* payload is either all vaddrs or all pages */
1519 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1527 LASSERT (payload_nob == 0);
1531 if (routing || target_is_router)
1532 break; /* send IMMEDIATE */
1534 /* is the REPLY message too small for RDMA? */
1535 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1536 if (nob <= IBLND_MSG_SIZE)
1537 break; /* send IMMEDIATE */
1539 tx = kiblnd_get_idle_tx(ni, target.nid);
1541 CERROR("Can't allocate txd for GET to %s\n",
1542 libcfs_nid2str(target.nid));
1547 rd = &ibmsg->ibm_u.get.ibgm_rd;
1548 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1549 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1550 lntmsg->msg_md->md_niov,
1551 lntmsg->msg_md->md_iov.iov,
1552 0, lntmsg->msg_md->md_length);
1554 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1555 lntmsg->msg_md->md_niov,
1556 lntmsg->msg_md->md_iov.kiov,
1557 0, lntmsg->msg_md->md_length);
1559 CERROR("Can't setup GET sink for %s: %d\n",
1560 libcfs_nid2str(target.nid), rc);
1561 kiblnd_tx_done(ni, tx);
1565 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1566 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1567 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1569 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1571 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1572 if (tx->tx_lntmsg[1] == NULL) {
1573 CERROR("Can't create reply for GET -> %s\n",
1574 libcfs_nid2str(target.nid));
1575 kiblnd_tx_done(ni, tx);
1579 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1580 tx->tx_waiting = 1; /* waiting for GET_DONE */
1581 kiblnd_launch_tx(ni, tx, target.nid);
1584 case LNET_MSG_REPLY:
1586 /* Is the payload small enough not to need RDMA? */
1587 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1588 if (nob <= IBLND_MSG_SIZE)
1589 break; /* send IMMEDIATE */
1591 tx = kiblnd_get_idle_tx(ni, target.nid);
1593 CERROR("Can't allocate %s txd for %s\n",
1594 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1595 libcfs_nid2str(target.nid));
1599 if (payload_kiov == NULL)
1600 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1601 payload_niov, payload_iov,
1602 payload_offset, payload_nob);
1604 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1605 payload_niov, payload_kiov,
1606 payload_offset, payload_nob);
1608 CERROR("Can't setup PUT src for %s: %d\n",
1609 libcfs_nid2str(target.nid), rc);
1610 kiblnd_tx_done(ni, tx);
1615 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1616 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1617 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1619 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1620 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1621 kiblnd_launch_tx(ni, tx, target.nid);
1625 /* send IMMEDIATE */
1627 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1630 tx = kiblnd_get_idle_tx(ni, target.nid);
1632 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1633 type, libcfs_nid2str(target.nid));
1638 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1640 if (payload_kiov != NULL)
1641 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1642 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1643 payload_niov, payload_kiov,
1644 payload_offset, payload_nob);
1646 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1647 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1648 payload_niov, payload_iov,
1649 payload_offset, payload_nob);
1651 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1652 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1654 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1655 kiblnd_launch_tx(ni, tx, target.nid);
1660 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1662 lnet_process_id_t target = lntmsg->msg_target;
1663 unsigned int niov = lntmsg->msg_niov;
1664 struct kvec *iov = lntmsg->msg_iov;
1665 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1666 unsigned int offset = lntmsg->msg_offset;
1667 unsigned int nob = lntmsg->msg_len;
1671 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1673 CERROR("Can't get tx for REPLY to %s\n",
1674 libcfs_nid2str(target.nid));
1680 else if (kiov == NULL)
1681 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1682 niov, iov, offset, nob);
1684 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1685 niov, kiov, offset, nob);
1688 CERROR("Can't setup GET src for %s: %d\n",
1689 libcfs_nid2str(target.nid), rc);
1693 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1694 IBLND_MSG_GET_DONE, nob,
1695 &rx->rx_msg->ibm_u.get.ibgm_rd,
1696 rx->rx_msg->ibm_u.get.ibgm_cookie);
1698 CERROR("Can't setup rdma for GET from %s: %d\n",
1699 libcfs_nid2str(target.nid), rc);
1704 /* No RDMA: local completion may happen now! */
1705 lnet_finalize(ni, lntmsg, 0);
1707 /* RDMA: lnet_finalize(lntmsg) when it
1709 tx->tx_lntmsg[0] = lntmsg;
1712 kiblnd_queue_tx(tx, rx->rx_conn);
1716 kiblnd_tx_done(ni, tx);
1718 lnet_finalize(ni, lntmsg, -EIO);
1722 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1723 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1724 unsigned int offset, unsigned int mlen, unsigned int rlen)
1726 kib_rx_t *rx = private;
1727 kib_msg_t *rxmsg = rx->rx_msg;
1728 kib_conn_t *conn = rx->rx_conn;
1731 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1734 LASSERT (mlen <= rlen);
1735 LASSERT (!in_interrupt());
1736 /* Either all pages or all vaddrs */
1737 LASSERT (!(kiov != NULL && iov != NULL));
1739 switch (rxmsg->ibm_type) {
1743 case IBLND_MSG_IMMEDIATE:
1744 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1745 if (nob > rx->rx_nob) {
1746 CERROR ("Immediate message from %s too big: %d(%d)\n",
1747 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1754 lnet_copy_flat2kiov(niov, kiov, offset,
1755 IBLND_MSG_SIZE, rxmsg,
1756 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1759 lnet_copy_flat2iov(niov, iov, offset,
1760 IBLND_MSG_SIZE, rxmsg,
1761 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1763 lnet_finalize (ni, lntmsg, 0);
1766 case IBLND_MSG_PUT_REQ: {
1768 kib_rdma_desc_t *rd;
1771 lnet_finalize(ni, lntmsg, 0);
1772 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1773 rxmsg->ibm_u.putreq.ibprm_cookie);
1777 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1779 CERROR("Can't allocate tx for %s\n",
1780 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1781 /* Not replying will break the connection */
1787 rd = &txmsg->ibm_u.putack.ibpam_rd;
1789 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1790 niov, iov, offset, mlen);
1792 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1793 niov, kiov, offset, mlen);
1795 CERROR("Can't setup PUT sink for %s: %d\n",
1796 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1797 kiblnd_tx_done(ni, tx);
1798 /* tell peer it's over */
1799 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1800 rxmsg->ibm_u.putreq.ibprm_cookie);
1804 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1805 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1806 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1808 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1810 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1811 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1812 kiblnd_queue_tx(tx, conn);
1814 /* reposted buffer reserved for PUT_DONE */
1815 post_credit = IBLND_POSTRX_NO_CREDIT;
1819 case IBLND_MSG_GET_REQ:
1820 if (lntmsg != NULL) {
1821 /* Optimized GET; RDMA lntmsg's payload */
1822 kiblnd_reply(ni, rx, lntmsg);
1824 /* GET didn't match anything */
1825 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1827 rxmsg->ibm_u.get.ibgm_cookie);
1832 kiblnd_post_rx(rx, post_credit);
1837 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1839 struct task_struct *task = kthread_run(fn, arg, name);
1842 return PTR_ERR(task);
1844 atomic_inc(&kiblnd_data.kib_nthreads);
1849 kiblnd_thread_fini (void)
1851 atomic_dec (&kiblnd_data.kib_nthreads);
1855 kiblnd_peer_alive (kib_peer_t *peer)
1857 /* This is racy, but everyone's only writing cfs_time_current() */
1858 peer->ibp_last_alive = cfs_time_current();
1863 kiblnd_peer_notify (kib_peer_t *peer)
1866 cfs_time_t last_alive = 0;
1867 unsigned long flags;
1869 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1871 if (kiblnd_peer_idle(peer) && peer->ibp_error != 0) {
1872 error = peer->ibp_error;
1873 peer->ibp_error = 0;
1875 last_alive = peer->ibp_last_alive;
1878 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1881 lnet_notify(peer->ibp_ni,
1882 peer->ibp_nid, 0, last_alive);
1886 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1888 /* This just does the immediate housekeeping. 'error' is zero for a
1889 * normal shutdown which can happen only after the connection has been
1890 * established. If the connection is established, schedule the
1891 * connection to be finished off by the connd. Otherwise the connd is
1892 * already dealing with it (either to set it up or tear it down).
1893 * Caller holds kib_global_lock exclusively in irq context */
1894 kib_peer_t *peer = conn->ibc_peer;
1896 unsigned long flags;
1898 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1900 if (error != 0 && conn->ibc_comms_error == 0)
1901 conn->ibc_comms_error = error;
1903 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1904 return; /* already being handled */
1907 list_empty(&conn->ibc_tx_noops) &&
1908 list_empty(&conn->ibc_tx_queue) &&
1909 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1910 list_empty(&conn->ibc_tx_queue_nocred) &&
1911 list_empty(&conn->ibc_active_txs)) {
1912 CDEBUG(D_NET, "closing conn to %s\n",
1913 libcfs_nid2str(peer->ibp_nid));
1915 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1916 libcfs_nid2str(peer->ibp_nid), error,
1917 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1918 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1919 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1920 "" : "(sending_rsrvd)",
1921 list_empty(&conn->ibc_tx_queue_nocred) ?
1922 "" : "(sending_nocred)",
1923 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1926 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1927 list_del(&conn->ibc_list);
1928 /* connd (see below) takes over ibc_list's ref */
1930 if (list_empty(&peer->ibp_conns) && /* no more conns */
1931 kiblnd_peer_active(peer)) { /* still in peer table */
1932 kiblnd_unlink_peer_locked(peer);
1934 /* set/clear error on last conn */
1935 peer->ibp_error = conn->ibc_comms_error;
1938 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1941 kiblnd_dev_can_failover(dev)) {
1942 list_add_tail(&dev->ibd_fail_list,
1943 &kiblnd_data.kib_failed_devs);
1944 wake_up(&kiblnd_data.kib_failover_waitq);
1947 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1949 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1950 wake_up(&kiblnd_data.kib_connd_waitq);
1952 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1956 kiblnd_close_conn(kib_conn_t *conn, int error)
1958 unsigned long flags;
1960 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1962 kiblnd_close_conn_locked(conn, error);
1964 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1968 kiblnd_handle_early_rxs(kib_conn_t *conn)
1970 unsigned long flags;
1973 LASSERT(!in_interrupt());
1974 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1976 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1977 while (!list_empty(&conn->ibc_early_rxs)) {
1978 rx = list_entry(conn->ibc_early_rxs.next,
1980 list_del(&rx->rx_list);
1981 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1983 kiblnd_handle_rx(rx);
1985 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1987 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1991 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1993 struct list_head zombies = LIST_HEAD_INIT(zombies);
1994 struct list_head *tmp;
1995 struct list_head *nxt;
1998 spin_lock(&conn->ibc_lock);
2000 list_for_each_safe(tmp, nxt, txs) {
2001 tx = list_entry(tmp, kib_tx_t, tx_list);
2003 if (txs == &conn->ibc_active_txs) {
2004 LASSERT(!tx->tx_queued);
2005 LASSERT(tx->tx_waiting ||
2006 tx->tx_sending != 0);
2008 LASSERT(tx->tx_queued);
2011 tx->tx_status = -ECONNABORTED;
2014 if (tx->tx_sending == 0) {
2016 list_del(&tx->tx_list);
2017 list_add(&tx->tx_list, &zombies);
2021 spin_unlock(&conn->ibc_lock);
2023 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2027 kiblnd_finalise_conn (kib_conn_t *conn)
2029 LASSERT (!in_interrupt());
2030 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2032 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2034 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2035 * for connections that didn't get as far as being connected, because
2036 * rdma_disconnect() does this for free. */
2037 kiblnd_abort_receives(conn);
2039 /* Complete all tx descs not waiting for sends to complete.
2040 * NB we should be safe from RDMA now that the QP has changed state */
2042 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2043 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2044 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2045 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2046 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2048 kiblnd_handle_early_rxs(conn);
2052 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2054 struct list_head zombies = LIST_HEAD_INIT(zombies);
2055 unsigned long flags;
2057 LASSERT (error != 0);
2058 LASSERT (!in_interrupt());
2060 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2063 LASSERT (peer->ibp_connecting > 0);
2064 peer->ibp_connecting--;
2066 LASSERT (peer->ibp_accepting > 0);
2067 peer->ibp_accepting--;
2070 if (kiblnd_peer_connecting(peer)) {
2071 /* another connection attempt under way... */
2072 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2077 peer->ibp_reconnected = 0;
2078 if (list_empty(&peer->ibp_conns)) {
2079 /* Take peer's blocked transmits to complete with error */
2080 list_add(&zombies, &peer->ibp_tx_queue);
2081 list_del_init(&peer->ibp_tx_queue);
2083 if (kiblnd_peer_active(peer))
2084 kiblnd_unlink_peer_locked(peer);
2086 peer->ibp_error = error;
2088 /* Can't have blocked transmits if there are connections */
2089 LASSERT(list_empty(&peer->ibp_tx_queue));
2092 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2094 kiblnd_peer_notify(peer);
2096 if (list_empty(&zombies))
2099 CNETERR("Deleting messages for %s: connection failed\n",
2100 libcfs_nid2str(peer->ibp_nid));
2102 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2106 kiblnd_connreq_done(kib_conn_t *conn, int status)
2108 kib_peer_t *peer = conn->ibc_peer;
2110 struct list_head txs;
2111 unsigned long flags;
2114 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2116 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2117 libcfs_nid2str(peer->ibp_nid), active,
2118 conn->ibc_version, status);
2120 LASSERT (!in_interrupt());
2121 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2122 peer->ibp_connecting > 0) ||
2123 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2124 peer->ibp_accepting > 0));
2126 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2127 conn->ibc_connvars = NULL;
2130 /* failed to establish connection */
2131 kiblnd_peer_connect_failed(peer, active, status);
2132 kiblnd_finalise_conn(conn);
2136 /* connection established */
2137 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2139 conn->ibc_last_send = jiffies;
2140 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2141 kiblnd_peer_alive(peer);
2143 /* Add conn to peer's list and nuke any dangling conns from a different
2144 * peer instance... */
2145 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2146 list_add(&conn->ibc_list, &peer->ibp_conns);
2147 peer->ibp_reconnected = 0;
2149 peer->ibp_connecting--;
2151 peer->ibp_accepting--;
2153 if (peer->ibp_version == 0) {
2154 peer->ibp_version = conn->ibc_version;
2155 peer->ibp_incarnation = conn->ibc_incarnation;
2158 if (peer->ibp_version != conn->ibc_version ||
2159 peer->ibp_incarnation != conn->ibc_incarnation) {
2160 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2161 conn->ibc_incarnation);
2162 peer->ibp_version = conn->ibc_version;
2163 peer->ibp_incarnation = conn->ibc_incarnation;
2166 /* grab pending txs while I have the lock */
2167 list_add(&txs, &peer->ibp_tx_queue);
2168 list_del_init(&peer->ibp_tx_queue);
2170 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2171 conn->ibc_comms_error != 0) { /* error has happened already */
2172 lnet_ni_t *ni = peer->ibp_ni;
2174 /* start to shut down connection */
2175 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2176 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2178 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2183 /* refcount taken by cmid is not reliable after I released the glock
2184 * because this connection is visible to other threads now, another
2185 * thread can find and close this connection right after I released
2186 * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2187 * called, it can release the connection refcount taken by cmid.
2188 * It means the connection could be destroyed before I finish my
2191 kiblnd_conn_addref(conn);
2192 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2194 /* Schedule blocked txs */
2195 spin_lock(&conn->ibc_lock);
2196 while (!list_empty(&txs)) {
2197 tx = list_entry(txs.next, kib_tx_t, tx_list);
2198 list_del(&tx->tx_list);
2200 kiblnd_queue_tx_locked(tx, conn);
2202 spin_unlock(&conn->ibc_lock);
2204 kiblnd_check_sends(conn);
2206 /* schedule blocked rxs */
2207 kiblnd_handle_early_rxs(conn);
2209 kiblnd_conn_decref(conn);
2213 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2217 rc = rdma_reject(cmid, rej, sizeof(*rej));
2220 CWARN("Error %d sending reject\n", rc);
2224 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2226 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2227 kib_msg_t *reqmsg = priv;
2233 lnet_ni_t *ni = NULL;
2234 kib_net_t *net = NULL;
2236 struct rdma_conn_param cp;
2238 int version = IBLND_MSG_VERSION;
2239 unsigned long flags;
2241 struct sockaddr_in *peer_addr;
2242 LASSERT (!in_interrupt());
2244 /* cmid inherits 'context' from the corresponding listener id */
2245 ibdev = (kib_dev_t *)cmid->context;
2246 LASSERT (ibdev != NULL);
2248 memset(&rej, 0, sizeof(rej));
2249 rej.ibr_magic = IBLND_MSG_MAGIC;
2250 rej.ibr_why = IBLND_REJECT_FATAL;
2251 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2253 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2254 if (*kiblnd_tunables.kib_require_priv_port &&
2255 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2256 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2257 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2258 &ip, ntohs(peer_addr->sin_port));
2262 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2263 CERROR("Short connection request\n");
2267 /* Future protocol version compatibility support! If the
2268 * o2iblnd-specific protocol changes, or when LNET unifies
2269 * protocols over all LNDs, the initial connection will
2270 * negotiate a protocol version. I trap this here to avoid
2271 * console errors; the reject tells the peer which protocol I
2273 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2274 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2276 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2277 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2278 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2280 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2281 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2282 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2285 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2287 CERROR("Can't parse connection request: %d\n", rc);
2291 nid = reqmsg->ibm_srcnid;
2292 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2295 net = (kib_net_t *)ni->ni_data;
2296 rej.ibr_incarnation = net->ibn_incarnation;
2299 if (ni == NULL || /* no matching net */
2300 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2301 net->ibn_dev != ibdev) { /* wrong device */
2302 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2303 "bad dst nid %s\n", libcfs_nid2str(nid),
2304 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2305 ibdev->ibd_ifname, ibdev->ibd_nnets,
2307 libcfs_nid2str(reqmsg->ibm_dstnid));
2312 /* check time stamp as soon as possible */
2313 if (reqmsg->ibm_dststamp != 0 &&
2314 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2315 CWARN("Stale connection request\n");
2316 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2320 /* I can accept peer's version */
2321 version = reqmsg->ibm_version;
2323 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2324 CERROR("Unexpected connreq msg type: %x from %s\n",
2325 reqmsg->ibm_type, libcfs_nid2str(nid));
2329 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2330 IBLND_MSG_QUEUE_SIZE(version)) {
2331 CERROR("Can't accept conn from %s, queue depth too large: "
2332 " %d (<=%d wanted)\n",
2333 libcfs_nid2str(nid),
2334 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2335 IBLND_MSG_QUEUE_SIZE(version));
2337 if (version == IBLND_MSG_VERSION)
2338 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2343 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2344 IBLND_RDMA_FRAGS(version)) {
2345 CWARN("Can't accept conn from %s (version %x): "
2346 "max_frags %d too large (%d wanted)\n",
2347 libcfs_nid2str(nid), version,
2348 reqmsg->ibm_u.connparams.ibcp_max_frags,
2349 IBLND_RDMA_FRAGS(version));
2351 if (version >= IBLND_MSG_VERSION)
2352 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2355 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2356 IBLND_RDMA_FRAGS(version) && net->ibn_fmr_ps == NULL) {
2357 CWARN("Can't accept conn from %s (version %x): "
2358 "max_frags %d incompatible without FMR pool "
2360 libcfs_nid2str(nid), version,
2361 reqmsg->ibm_u.connparams.ibcp_max_frags,
2362 IBLND_RDMA_FRAGS(version));
2364 if (version >= IBLND_MSG_VERSION)
2365 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2370 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2371 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2372 libcfs_nid2str(nid),
2373 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2378 /* assume 'nid' is a new peer; create */
2379 rc = kiblnd_create_peer(ni, &peer, nid);
2381 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2382 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2386 /* We have validated the peer's parameters so use those */
2387 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2388 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2390 write_lock_irqsave(g_lock, flags);
2392 peer2 = kiblnd_find_peer_locked(nid);
2393 if (peer2 != NULL) {
2394 if (peer2->ibp_version == 0) {
2395 peer2->ibp_version = version;
2396 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2399 /* not the guy I've talked with */
2400 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2401 peer2->ibp_version != version) {
2402 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2404 if (kiblnd_peer_active(peer2)) {
2405 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2406 peer2->ibp_version = version;
2408 write_unlock_irqrestore(g_lock, flags);
2410 CWARN("Conn stale %s version %x/%x incarnation "LPU64"/"LPU64"\n",
2411 libcfs_nid2str(nid), peer2->ibp_version, version,
2412 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2414 kiblnd_peer_decref(peer);
2415 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2419 /* tie-break connection race in favour of the higher NID */
2420 if (peer2->ibp_connecting != 0 &&
2422 write_unlock_irqrestore(g_lock, flags);
2424 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2426 kiblnd_peer_decref(peer);
2427 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2431 * passive connection is allowed even this peer is waiting for
2434 peer2->ibp_reconnecting = 0;
2435 peer2->ibp_accepting++;
2436 kiblnd_peer_addref(peer2);
2438 /* Race with kiblnd_launch_tx (active connect) to create peer
2439 * so copy validated parameters since we now know what the
2440 * peer's limits are */
2441 peer2->ibp_max_frags = peer->ibp_max_frags;
2442 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2444 write_unlock_irqrestore(g_lock, flags);
2445 kiblnd_peer_decref(peer);
2448 /* Brand new peer */
2449 LASSERT (peer->ibp_accepting == 0);
2450 LASSERT (peer->ibp_version == 0 &&
2451 peer->ibp_incarnation == 0);
2453 peer->ibp_accepting = 1;
2454 peer->ibp_version = version;
2455 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2457 /* I have a ref on ni that prevents it being shutdown */
2458 LASSERT (net->ibn_shutdown == 0);
2460 kiblnd_peer_addref(peer);
2461 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2463 write_unlock_irqrestore(g_lock, flags);
2466 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2468 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2469 kiblnd_peer_decref(peer);
2470 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2474 /* conn now "owns" cmid, so I return success from here on to ensure the
2475 * CM callback doesn't destroy cmid. */
2476 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2477 conn->ibc_credits = conn->ibc_queue_depth;
2478 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2479 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2480 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2482 ackmsg = &conn->ibc_connvars->cv_msg;
2483 memset(ackmsg, 0, sizeof(*ackmsg));
2485 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2486 sizeof(ackmsg->ibm_u.connparams));
2487 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2488 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2489 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2491 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2493 memset(&cp, 0, sizeof(cp));
2494 cp.private_data = ackmsg;
2495 cp.private_data_len = ackmsg->ibm_nob;
2496 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2497 cp.initiator_depth = 0;
2498 cp.flow_control = 1;
2499 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2500 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2502 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2504 rc = rdma_accept(cmid, &cp);
2506 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2507 rej.ibr_version = version;
2508 rej.ibr_why = IBLND_REJECT_FATAL;
2510 kiblnd_reject(cmid, &rej);
2511 kiblnd_connreq_done(conn, rc);
2512 kiblnd_conn_decref(conn);
2522 rej.ibr_version = version;
2523 rej.ibr_cp.ibcp_queue_depth = IBLND_MSG_QUEUE_SIZE(version);
2524 rej.ibr_cp.ibcp_max_frags = IBLND_RDMA_FRAGS(version);
2525 kiblnd_reject(cmid, &rej);
2527 return -ECONNREFUSED;
2531 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2532 __u64 incarnation, int why, kib_connparams_t *cp)
2534 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2535 kib_peer_t *peer = conn->ibc_peer;
2537 int msg_size = IBLND_MSG_SIZE;
2541 unsigned long flags;
2543 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2544 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2545 LASSERT(!peer->ibp_reconnecting);
2548 msg_size = cp->ibcp_max_msg_size;
2549 frag_num = cp->ibcp_max_frags;
2550 queue_dep = cp->ibcp_queue_depth;
2553 write_lock_irqsave(glock, flags);
2554 /* retry connection if it's still needed and no other connection
2555 * attempts (active or passive) are in progress
2556 * NB: reconnect is still needed even when ibp_tx_queue is
2557 * empty if ibp_version != version because reconnect may be
2558 * initiated by kiblnd_query() */
2559 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2560 peer->ibp_version != version) &&
2561 peer->ibp_connecting == 1 &&
2562 peer->ibp_accepting == 0;
2573 case IBLND_REJECT_RDMA_FRAGS:
2575 reason = "can't negotiate max frags";
2578 if (*kiblnd_tunables.kib_map_on_demand == 0) {
2579 reason = "map_on_demand must be enabled";
2582 if (conn->ibc_max_frags <= frag_num) {
2583 reason = "unsupported max frags";
2587 peer->ibp_max_frags = frag_num;
2588 reason = "rdma fragments";
2591 case IBLND_REJECT_MSG_QUEUE_SIZE:
2593 reason = "can't negotiate queue depth";
2596 if (conn->ibc_queue_depth <= queue_dep) {
2597 reason = "unsupported queue depth";
2601 peer->ibp_queue_depth = queue_dep;
2602 reason = "queue depth";
2605 case IBLND_REJECT_CONN_STALE:
2609 case IBLND_REJECT_CONN_RACE:
2610 reason = "conn race";
2613 case IBLND_REJECT_CONN_UNCOMPAT:
2614 reason = "version negotiation";
2618 conn->ibc_reconnect = 1;
2619 peer->ibp_reconnecting = 1;
2620 peer->ibp_version = version;
2621 if (incarnation != 0)
2622 peer->ibp_incarnation = incarnation;
2624 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2626 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2627 libcfs_nid2str(peer->ibp_nid),
2628 reconnect ? "reconnect" : "don't reconnect",
2629 reason, IBLND_MSG_VERSION, version, msg_size,
2630 conn->ibc_queue_depth, queue_dep,
2631 conn->ibc_max_frags, frag_num);
2633 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2634 * while destroying the zombie
2639 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2641 kib_peer_t *peer = conn->ibc_peer;
2643 LASSERT (!in_interrupt());
2644 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2647 case IB_CM_REJ_STALE_CONN:
2648 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2649 IBLND_REJECT_CONN_STALE, NULL);
2652 case IB_CM_REJ_INVALID_SERVICE_ID:
2653 CNETERR("%s rejected: no listener at %d\n",
2654 libcfs_nid2str(peer->ibp_nid),
2655 *kiblnd_tunables.kib_service);
2658 case IB_CM_REJ_CONSUMER_DEFINED:
2659 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2660 kib_rej_t *rej = priv;
2661 kib_connparams_t *cp = NULL;
2663 __u64 incarnation = -1;
2665 /* NB. default incarnation is -1 because:
2666 * a) V1 will ignore dst incarnation in connreq.
2667 * b) V2 will provide incarnation while rejecting me,
2668 * -1 will be overwrote.
2670 * if I try to connect to a V1 peer with V2 protocol,
2671 * it rejected me then upgrade to V2, I have no idea
2672 * about the upgrading and try to reconnect with V1,
2673 * in this case upgraded V2 can find out I'm trying to
2674 * talk to the old guy and reject me(incarnation is -1).
2677 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2678 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2679 __swab32s(&rej->ibr_magic);
2680 __swab16s(&rej->ibr_version);
2684 if (priv_nob >= sizeof(kib_rej_t) &&
2685 rej->ibr_version > IBLND_MSG_VERSION_1) {
2686 /* priv_nob is always 148 in current version
2687 * of OFED, so we still need to check version.
2688 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2692 __swab64s(&rej->ibr_incarnation);
2693 __swab16s(&cp->ibcp_queue_depth);
2694 __swab16s(&cp->ibcp_max_frags);
2695 __swab32s(&cp->ibcp_max_msg_size);
2698 incarnation = rej->ibr_incarnation;
2701 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2702 rej->ibr_magic != LNET_PROTO_MAGIC) {
2703 CERROR("%s rejected: consumer defined fatal error\n",
2704 libcfs_nid2str(peer->ibp_nid));
2708 if (rej->ibr_version != IBLND_MSG_VERSION &&
2709 rej->ibr_version != IBLND_MSG_VERSION_1) {
2710 CERROR("%s rejected: o2iblnd version %x error\n",
2711 libcfs_nid2str(peer->ibp_nid),
2716 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2717 rej->ibr_version == IBLND_MSG_VERSION_1) {
2718 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2719 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2721 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2722 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2725 switch (rej->ibr_why) {
2726 case IBLND_REJECT_CONN_RACE:
2727 case IBLND_REJECT_CONN_STALE:
2728 case IBLND_REJECT_CONN_UNCOMPAT:
2729 case IBLND_REJECT_MSG_QUEUE_SIZE:
2730 case IBLND_REJECT_RDMA_FRAGS:
2731 kiblnd_check_reconnect(conn, rej->ibr_version,
2732 incarnation, rej->ibr_why, cp);
2735 case IBLND_REJECT_NO_RESOURCES:
2736 CERROR("%s rejected: o2iblnd no resources\n",
2737 libcfs_nid2str(peer->ibp_nid));
2740 case IBLND_REJECT_FATAL:
2741 CERROR("%s rejected: o2iblnd fatal error\n",
2742 libcfs_nid2str(peer->ibp_nid));
2746 CERROR("%s rejected: o2iblnd reason %d\n",
2747 libcfs_nid2str(peer->ibp_nid),
2755 CNETERR("%s rejected: reason %d, size %d\n",
2756 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2760 kiblnd_connreq_done(conn, -ECONNREFUSED);
2764 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2766 kib_peer_t *peer = conn->ibc_peer;
2767 lnet_ni_t *ni = peer->ibp_ni;
2768 kib_net_t *net = ni->ni_data;
2769 kib_msg_t *msg = priv;
2770 int ver = conn->ibc_version;
2771 int rc = kiblnd_unpack_msg(msg, priv_nob);
2772 unsigned long flags;
2774 LASSERT (net != NULL);
2777 CERROR("Can't unpack connack from %s: %d\n",
2778 libcfs_nid2str(peer->ibp_nid), rc);
2782 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2783 CERROR("Unexpected message %d from %s\n",
2784 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2789 if (ver != msg->ibm_version) {
2790 CERROR("%s replied version %x is different with "
2791 "requested version %x\n",
2792 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2797 if (msg->ibm_u.connparams.ibcp_queue_depth >
2798 conn->ibc_queue_depth) {
2799 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2800 libcfs_nid2str(peer->ibp_nid),
2801 msg->ibm_u.connparams.ibcp_queue_depth,
2802 conn->ibc_queue_depth);
2807 if (msg->ibm_u.connparams.ibcp_max_frags >
2808 conn->ibc_max_frags) {
2809 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2810 libcfs_nid2str(peer->ibp_nid),
2811 msg->ibm_u.connparams.ibcp_max_frags,
2812 conn->ibc_max_frags);
2817 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2818 CERROR("%s max message size %d too big (%d max)\n",
2819 libcfs_nid2str(peer->ibp_nid),
2820 msg->ibm_u.connparams.ibcp_max_msg_size,
2826 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2827 if (msg->ibm_dstnid == ni->ni_nid &&
2828 msg->ibm_dststamp == net->ibn_incarnation)
2832 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2835 CERROR("Bad connection reply from %s, rc = %d, "
2836 "version: %x max_frags: %d\n",
2837 libcfs_nid2str(peer->ibp_nid), rc,
2838 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2842 conn->ibc_incarnation = msg->ibm_srcstamp;
2843 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2844 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2845 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2846 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2847 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2848 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2850 kiblnd_connreq_done(conn, 0);
2854 /* NB My QP has already established itself, so I handle anything going
2855 * wrong here by setting ibc_comms_error.
2856 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2857 * immediately tears it down. */
2860 conn->ibc_comms_error = rc;
2861 kiblnd_connreq_done(conn, 0);
2865 kiblnd_active_connect (struct rdma_cm_id *cmid)
2867 kib_peer_t *peer = (kib_peer_t *)cmid->context;
2870 struct rdma_conn_param cp;
2873 unsigned long flags;
2876 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2878 incarnation = peer->ibp_incarnation;
2879 version = (peer->ibp_version == 0) ? IBLND_MSG_VERSION :
2882 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2884 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2887 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2888 kiblnd_peer_decref(peer); /* lose cmid's ref */
2892 /* conn "owns" cmid now, so I return success from here on to ensure the
2893 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2896 msg = &conn->ibc_connvars->cv_msg;
2898 memset(msg, 0, sizeof(*msg));
2899 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2900 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2901 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2902 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2904 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2905 0, peer->ibp_nid, incarnation);
2907 memset(&cp, 0, sizeof(cp));
2908 cp.private_data = msg;
2909 cp.private_data_len = msg->ibm_nob;
2910 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2911 cp.initiator_depth = 0;
2912 cp.flow_control = 1;
2913 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2914 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2916 LASSERT(cmid->context == (void *)conn);
2917 LASSERT(conn->ibc_cmid == cmid);
2919 rc = rdma_connect(cmid, &cp);
2921 CERROR("Can't connect to %s: %d\n",
2922 libcfs_nid2str(peer->ibp_nid), rc);
2923 kiblnd_connreq_done(conn, rc);
2924 kiblnd_conn_decref(conn);
2931 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2937 switch (event->event) {
2939 CERROR("Unexpected event: %d, status: %d\n",
2940 event->event, event->status);
2943 case RDMA_CM_EVENT_CONNECT_REQUEST:
2944 /* destroy cmid on failure */
2945 rc = kiblnd_passive_connect(cmid,
2946 (void *)KIBLND_CONN_PARAM(event),
2947 KIBLND_CONN_PARAM_LEN(event));
2948 CDEBUG(D_NET, "connreq: %d\n", rc);
2951 case RDMA_CM_EVENT_ADDR_ERROR:
2952 peer = (kib_peer_t *)cmid->context;
2953 CNETERR("%s: ADDR ERROR %d\n",
2954 libcfs_nid2str(peer->ibp_nid), event->status);
2955 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2956 kiblnd_peer_decref(peer);
2957 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2959 case RDMA_CM_EVENT_ADDR_RESOLVED:
2960 peer = (kib_peer_t *)cmid->context;
2962 CDEBUG(D_NET,"%s Addr resolved: %d\n",
2963 libcfs_nid2str(peer->ibp_nid), event->status);
2965 if (event->status != 0) {
2966 CNETERR("Can't resolve address for %s: %d\n",
2967 libcfs_nid2str(peer->ibp_nid), event->status);
2970 rc = rdma_resolve_route(
2971 cmid, *kiblnd_tunables.kib_timeout * 1000);
2974 /* Can't initiate route resolution */
2975 CERROR("Can't resolve route for %s: %d\n",
2976 libcfs_nid2str(peer->ibp_nid), rc);
2978 kiblnd_peer_connect_failed(peer, 1, rc);
2979 kiblnd_peer_decref(peer);
2980 return rc; /* rc != 0 destroys cmid */
2982 case RDMA_CM_EVENT_ROUTE_ERROR:
2983 peer = (kib_peer_t *)cmid->context;
2984 CNETERR("%s: ROUTE ERROR %d\n",
2985 libcfs_nid2str(peer->ibp_nid), event->status);
2986 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2987 kiblnd_peer_decref(peer);
2988 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
2990 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2991 peer = (kib_peer_t *)cmid->context;
2992 CDEBUG(D_NET,"%s Route resolved: %d\n",
2993 libcfs_nid2str(peer->ibp_nid), event->status);
2995 if (event->status == 0)
2996 return kiblnd_active_connect(cmid);
2998 CNETERR("Can't resolve route for %s: %d\n",
2999 libcfs_nid2str(peer->ibp_nid), event->status);
3000 kiblnd_peer_connect_failed(peer, 1, event->status);
3001 kiblnd_peer_decref(peer);
3002 return event->status; /* rc != 0 destroys cmid */
3004 case RDMA_CM_EVENT_UNREACHABLE:
3005 conn = (kib_conn_t *)cmid->context;
3006 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3007 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3008 CNETERR("%s: UNREACHABLE %d\n",
3009 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3010 kiblnd_connreq_done(conn, -ENETDOWN);
3011 kiblnd_conn_decref(conn);
3014 case RDMA_CM_EVENT_CONNECT_ERROR:
3015 conn = (kib_conn_t *)cmid->context;
3016 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3017 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3018 CNETERR("%s: CONNECT ERROR %d\n",
3019 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3020 kiblnd_connreq_done(conn, -ENOTCONN);
3021 kiblnd_conn_decref(conn);
3024 case RDMA_CM_EVENT_REJECTED:
3025 conn = (kib_conn_t *)cmid->context;
3026 switch (conn->ibc_state) {
3030 case IBLND_CONN_PASSIVE_WAIT:
3031 CERROR ("%s: REJECTED %d\n",
3032 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3034 kiblnd_connreq_done(conn, -ECONNRESET);
3037 case IBLND_CONN_ACTIVE_CONNECT:
3038 kiblnd_rejected(conn, event->status,
3039 (void *)KIBLND_CONN_PARAM(event),
3040 KIBLND_CONN_PARAM_LEN(event));
3043 kiblnd_conn_decref(conn);
3046 case RDMA_CM_EVENT_ESTABLISHED:
3047 conn = (kib_conn_t *)cmid->context;
3048 switch (conn->ibc_state) {
3052 case IBLND_CONN_PASSIVE_WAIT:
3053 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3054 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3055 kiblnd_connreq_done(conn, 0);
3058 case IBLND_CONN_ACTIVE_CONNECT:
3059 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3060 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3061 kiblnd_check_connreply(conn,
3062 (void *)KIBLND_CONN_PARAM(event),
3063 KIBLND_CONN_PARAM_LEN(event));
3066 /* net keeps its ref on conn! */
3069 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3070 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3073 case RDMA_CM_EVENT_DISCONNECTED:
3074 conn = (kib_conn_t *)cmid->context;
3075 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3076 CERROR("%s DISCONNECTED\n",
3077 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3078 kiblnd_connreq_done(conn, -ECONNRESET);
3080 kiblnd_close_conn(conn, 0);
3082 kiblnd_conn_decref(conn);
3083 cmid->context = NULL;
3086 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3087 LCONSOLE_ERROR_MSG(0x131,
3088 "Received notification of device removal\n"
3089 "Please shutdown LNET to allow this to proceed\n");
3090 /* Can't remove network from underneath LNET for now, so I have
3094 case RDMA_CM_EVENT_ADDR_CHANGE:
3095 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3101 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3104 struct list_head *ttmp;
3106 list_for_each(ttmp, txs) {
3107 tx = list_entry(ttmp, kib_tx_t, tx_list);
3109 if (txs != &conn->ibc_active_txs) {
3110 LASSERT(tx->tx_queued);
3112 LASSERT(!tx->tx_queued);
3113 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3116 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3117 CERROR("Timed out tx: %s, %lu seconds\n",
3118 kiblnd_queue2str(conn, txs),
3119 cfs_duration_sec(jiffies - tx->tx_deadline));
3128 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3130 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3131 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3132 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3133 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3134 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3138 kiblnd_check_conns (int idx)
3140 struct list_head closes = LIST_HEAD_INIT(closes);
3141 struct list_head checksends = LIST_HEAD_INIT(checksends);
3142 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3143 struct list_head *ptmp;
3146 struct list_head *ctmp;
3147 unsigned long flags;
3149 /* NB. We expect to have a look at all the peers and not find any
3150 * RDMAs to time out, so we just use a shared lock while we
3152 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3154 list_for_each(ptmp, peers) {
3155 peer = list_entry(ptmp, kib_peer_t, ibp_list);
3157 list_for_each(ctmp, &peer->ibp_conns) {
3161 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3163 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3165 spin_lock(&conn->ibc_lock);
3167 sendnoop = kiblnd_need_noop(conn);
3168 timedout = kiblnd_conn_timed_out_locked(conn);
3169 if (!sendnoop && !timedout) {
3170 spin_unlock(&conn->ibc_lock);
3175 CERROR("Timed out RDMA with %s (%lu): "
3176 "c: %u, oc: %u, rc: %u\n",
3177 libcfs_nid2str(peer->ibp_nid),
3178 cfs_duration_sec(cfs_time_current() -
3179 peer->ibp_last_alive),
3181 conn->ibc_outstanding_credits,
3182 conn->ibc_reserved_credits);
3183 list_add(&conn->ibc_connd_list, &closes);
3185 list_add(&conn->ibc_connd_list, &checksends);
3187 /* +ref for 'closes' or 'checksends' */
3188 kiblnd_conn_addref(conn);
3190 spin_unlock(&conn->ibc_lock);
3194 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3196 /* Handle timeout by closing the whole
3197 * connection. We can only be sure RDMA activity
3198 * has ceased once the QP has been modified. */
3199 while (!list_empty(&closes)) {
3200 conn = list_entry(closes.next,
3201 kib_conn_t, ibc_connd_list);
3202 list_del(&conn->ibc_connd_list);
3203 kiblnd_close_conn(conn, -ETIMEDOUT);
3204 kiblnd_conn_decref(conn);
3207 /* In case we have enough credits to return via a
3208 * NOOP, but there were no non-blocking tx descs
3209 * free to do it last time... */
3210 while (!list_empty(&checksends)) {
3211 conn = list_entry(checksends.next,
3212 kib_conn_t, ibc_connd_list);
3213 list_del(&conn->ibc_connd_list);
3214 kiblnd_check_sends(conn);
3215 kiblnd_conn_decref(conn);
3220 kiblnd_disconnect_conn (kib_conn_t *conn)
3222 LASSERT (!in_interrupt());
3223 LASSERT (current == kiblnd_data.kib_connd);
3224 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3226 rdma_disconnect(conn->ibc_cmid);
3227 kiblnd_finalise_conn(conn);
3229 kiblnd_peer_notify(conn->ibc_peer);
3233 * High-water for reconnection to the same peer, reconnection attempt should
3234 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3236 #define KIB_RECONN_HIGH_RACE 10
3238 * Allow connd to take a break and handle other things after consecutive
3239 * reconnection attemps.
3241 #define KIB_RECONN_BREAK 100
3244 kiblnd_connd (void *arg)
3246 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3248 unsigned long flags;
3254 unsigned long deadline = jiffies;
3256 cfs_block_allsigs();
3258 init_waitqueue_entry(&wait, current);
3259 kiblnd_data.kib_connd = current;
3261 spin_lock_irqsave(lock, flags);
3263 while (!kiblnd_data.kib_shutdown) {
3268 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3269 kib_peer_t *peer = NULL;
3271 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3272 kib_conn_t, ibc_list);
3273 list_del(&conn->ibc_list);
3274 if (conn->ibc_reconnect) {
3275 peer = conn->ibc_peer;
3276 kiblnd_peer_addref(peer);
3279 spin_unlock_irqrestore(lock, flags);
3282 kiblnd_destroy_conn(conn, !peer);
3284 spin_lock_irqsave(lock, flags);
3288 conn->ibc_peer = peer;
3289 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3290 list_add_tail(&conn->ibc_list,
3291 &kiblnd_data.kib_reconn_list);
3293 list_add_tail(&conn->ibc_list,
3294 &kiblnd_data.kib_reconn_wait);
3297 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3298 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3299 kib_conn_t, ibc_list);
3300 list_del(&conn->ibc_list);
3302 spin_unlock_irqrestore(lock, flags);
3305 kiblnd_disconnect_conn(conn);
3306 kiblnd_conn_decref(conn);
3308 spin_lock_irqsave(lock, flags);
3311 while (reconn < KIB_RECONN_BREAK) {
3312 if (kiblnd_data.kib_reconn_sec != get_seconds()) {
3313 kiblnd_data.kib_reconn_sec = get_seconds();
3314 list_splice_init(&kiblnd_data.kib_reconn_wait,
3315 &kiblnd_data.kib_reconn_list);
3318 if (list_empty(&kiblnd_data.kib_reconn_list))
3321 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3322 kib_conn_t, ibc_list);
3323 list_del(&conn->ibc_list);
3325 spin_unlock_irqrestore(lock, flags);
3328 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3329 kiblnd_peer_decref(conn->ibc_peer);
3330 LIBCFS_FREE(conn, sizeof(*conn));
3332 spin_lock_irqsave(lock, flags);
3335 /* careful with the jiffy wrap... */
3336 timeout = (int)(deadline - jiffies);
3340 int chunk = kiblnd_data.kib_peer_hash_size;
3342 spin_unlock_irqrestore(lock, flags);
3345 /* Time to check for RDMA timeouts on a few more
3346 * peers: I do checks every 'p' seconds on a
3347 * proportion of the peer table and I need to check
3348 * every connection 'n' times within a timeout
3349 * interval, to ensure I detect a timeout on any
3350 * connection within (n+1)/n times the timeout
3353 if (*kiblnd_tunables.kib_timeout > n * p)
3354 chunk = (chunk * n * p) /
3355 *kiblnd_tunables.kib_timeout;
3359 for (i = 0; i < chunk; i++) {
3360 kiblnd_check_conns(peer_index);
3361 peer_index = (peer_index + 1) %
3362 kiblnd_data.kib_peer_hash_size;
3365 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3366 spin_lock_irqsave(lock, flags);
3372 /* Nothing to do for 'timeout' */
3373 set_current_state(TASK_INTERRUPTIBLE);
3374 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3375 spin_unlock_irqrestore(lock, flags);
3377 schedule_timeout(timeout);
3379 set_current_state(TASK_RUNNING);
3380 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3381 spin_lock_irqsave(lock, flags);
3384 spin_unlock_irqrestore(lock, flags);
3386 kiblnd_thread_fini();
3391 kiblnd_qp_event(struct ib_event *event, void *arg)
3393 kib_conn_t *conn = arg;
3395 switch (event->event) {
3396 case IB_EVENT_COMM_EST:
3397 CDEBUG(D_NET, "%s established\n",
3398 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3402 CERROR("%s: Async QP event type %d\n",
3403 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3409 kiblnd_complete (struct ib_wc *wc)
3411 switch (kiblnd_wreqid2type(wc->wr_id)) {
3416 if (wc->status != IB_WC_SUCCESS &&
3417 wc->status != IB_WC_WR_FLUSH_ERR)
3418 CNETERR("FastReg failed: %d\n", wc->status);
3421 case IBLND_WID_RDMA:
3422 /* We only get RDMA completion notification if it fails. All
3423 * subsequent work items, including the final SEND will fail
3424 * too. However we can't print out any more info about the
3425 * failing RDMA because 'tx' might be back on the idle list or
3426 * even reused already if we didn't manage to post all our work
3428 CNETERR("RDMA (tx: %p) failed: %d\n",
3429 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3433 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3437 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3444 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3446 /* NB I'm not allowed to schedule this conn once its refcount has
3447 * reached 0. Since fundamentally I'm racing with scheduler threads
3448 * consuming my CQ I could be called after all completions have
3449 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3450 * and this CQ is about to be destroyed so I NOOP. */
3451 kib_conn_t *conn = (kib_conn_t *)arg;
3452 struct kib_sched_info *sched = conn->ibc_sched;
3453 unsigned long flags;
3455 LASSERT(cq == conn->ibc_cq);
3457 spin_lock_irqsave(&sched->ibs_lock, flags);
3459 conn->ibc_ready = 1;
3461 if (!conn->ibc_scheduled &&
3462 (conn->ibc_nrx > 0 ||
3463 conn->ibc_nsends_posted > 0)) {
3464 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3465 conn->ibc_scheduled = 1;
3466 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3468 if (waitqueue_active(&sched->ibs_waitq))
3469 wake_up(&sched->ibs_waitq);
3472 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3476 kiblnd_cq_event(struct ib_event *event, void *arg)
3478 kib_conn_t *conn = arg;
3480 CERROR("%s: async CQ event type %d\n",
3481 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3485 kiblnd_scheduler(void *arg)
3487 long id = (long)arg;
3488 struct kib_sched_info *sched;
3491 unsigned long flags;
3497 cfs_block_allsigs();
3499 init_waitqueue_entry(&wait, current);
3501 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3503 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3505 CWARN("Failed to bind on CPT %d, please verify whether "
3506 "all CPUs are healthy and reload modules if necessary, "
3507 "otherwise your system might under risk of low "
3508 "performance\n", sched->ibs_cpt);
3511 spin_lock_irqsave(&sched->ibs_lock, flags);
3513 while (!kiblnd_data.kib_shutdown) {
3514 if (busy_loops++ >= IBLND_RESCHED) {
3515 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3520 spin_lock_irqsave(&sched->ibs_lock, flags);
3525 if (!list_empty(&sched->ibs_conns)) {
3526 conn = list_entry(sched->ibs_conns.next,
3527 kib_conn_t, ibc_sched_list);
3528 /* take over kib_sched_conns' ref on conn... */
3529 LASSERT(conn->ibc_scheduled);
3530 list_del(&conn->ibc_sched_list);
3531 conn->ibc_ready = 0;
3533 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3535 wc.wr_id = IBLND_WID_INVAL;
3537 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3539 rc = ib_req_notify_cq(conn->ibc_cq,
3542 CWARN("%s: ib_req_notify_cq failed: %d, "
3543 "closing connection\n",
3544 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3545 kiblnd_close_conn(conn, -EIO);
3546 kiblnd_conn_decref(conn);
3547 spin_lock_irqsave(&sched->ibs_lock,
3552 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3555 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3557 "ib_poll_cq (rc: %d) returned invalid "
3558 "wr_id, opcode %d, status: %d, "
3559 "vendor_err: %d, conn: %s status: %d\n"
3560 "please upgrade firmware and OFED or "
3561 "contact vendor.\n", rc,
3562 wc.opcode, wc.status, wc.vendor_err,
3563 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3569 CWARN("%s: ib_poll_cq failed: %d, "
3570 "closing connection\n",
3571 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3573 kiblnd_close_conn(conn, -EIO);
3574 kiblnd_conn_decref(conn);
3575 spin_lock_irqsave(&sched->ibs_lock, flags);
3579 spin_lock_irqsave(&sched->ibs_lock, flags);
3581 if (rc != 0 || conn->ibc_ready) {
3582 /* There may be another completion waiting; get
3583 * another scheduler to check while I handle
3585 /* +1 ref for sched_conns */
3586 kiblnd_conn_addref(conn);
3587 list_add_tail(&conn->ibc_sched_list,
3589 if (waitqueue_active(&sched->ibs_waitq))
3590 wake_up(&sched->ibs_waitq);
3592 conn->ibc_scheduled = 0;
3596 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3597 kiblnd_complete(&wc);
3599 spin_lock_irqsave(&sched->ibs_lock, flags);
3602 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3609 set_current_state(TASK_INTERRUPTIBLE);
3610 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3611 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3616 remove_wait_queue(&sched->ibs_waitq, &wait);
3617 set_current_state(TASK_RUNNING);
3618 spin_lock_irqsave(&sched->ibs_lock, flags);
3621 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3623 kiblnd_thread_fini();
3628 kiblnd_failover_thread(void *arg)
3630 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3633 unsigned long flags;
3636 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3638 cfs_block_allsigs();
3640 init_waitqueue_entry(&wait, current);
3641 write_lock_irqsave(glock, flags);
3643 while (!kiblnd_data.kib_shutdown) {
3644 int do_failover = 0;
3647 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3649 if (cfs_time_before(cfs_time_current(),
3650 dev->ibd_next_failover))
3657 list_del_init(&dev->ibd_fail_list);
3658 dev->ibd_failover = 1;
3659 write_unlock_irqrestore(glock, flags);
3661 rc = kiblnd_dev_failover(dev);
3663 write_lock_irqsave(glock, flags);
3665 LASSERT (dev->ibd_failover);
3666 dev->ibd_failover = 0;
3667 if (rc >= 0) { /* Device is OK or failover succeed */
3668 dev->ibd_next_failover = cfs_time_shift(3);
3672 /* failed to failover, retry later */
3673 dev->ibd_next_failover =
3674 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3675 if (kiblnd_dev_can_failover(dev)) {
3676 list_add_tail(&dev->ibd_fail_list,
3677 &kiblnd_data.kib_failed_devs);
3683 /* long sleep if no more pending failover */
3684 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3686 set_current_state(TASK_INTERRUPTIBLE);
3687 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3688 write_unlock_irqrestore(glock, flags);
3690 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3691 cfs_time_seconds(1));
3692 set_current_state(TASK_RUNNING);
3693 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3694 write_lock_irqsave(glock, flags);
3696 if (!long_sleep || rc != 0)
3699 /* have a long sleep, routine check all active devices,
3700 * we need checking like this because if there is not active
3701 * connection on the dev and no SEND from local, we may listen
3702 * on wrong HCA for ever while there is a bonding failover */
3703 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3704 if (kiblnd_dev_can_failover(dev)) {
3705 list_add_tail(&dev->ibd_fail_list,
3706 &kiblnd_data.kib_failed_devs);
3711 write_unlock_irqrestore(glock, flags);
3713 kiblnd_thread_fini();