4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/klnds/o2iblnd/o2iblnd_cb.c
34 * Author: Eric Barton <eric@bartonsoftware.com>
39 #define MAX_CONN_RACES_BEFORE_ABORT 20
41 static void kiblnd_peer_alive(struct kib_peer *peer);
42 static void kiblnd_peer_connect_failed(struct kib_peer *peer, int active, int error);
43 static void kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx,
44 int type, int body_nob);
45 static int kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
46 int resid, struct kib_rdma_desc *dstrd,
48 static void kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn);
49 static void kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn);
50 static void kiblnd_unmap_tx(struct kib_tx *tx);
51 static void kiblnd_check_sends_locked(struct kib_conn *conn);
54 kiblnd_tx_done(struct lnet_ni *ni, struct kib_tx *tx)
56 struct lnet_msg *lntmsg[2];
57 struct kib_net *net = ni->ni_data;
62 LASSERT(!in_interrupt());
63 LASSERT(!tx->tx_queued); /* mustn't be queued for sending */
64 LASSERT(!tx->tx_sending); /* mustn't be awaiting sent callback */
65 LASSERT(!tx->tx_waiting); /* mustn't be awaiting peer response */
70 /* tx may have up to 2 lnet msgs to finalise */
71 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
72 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
76 LASSERT(ni == tx->tx_conn->ibc_peer->ibp_ni);
78 kiblnd_conn_decref(tx->tx_conn);
85 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
87 /* delay finalize until my descs have been freed */
88 for (i = 0; i < 2; i++) {
92 lnet_finalize(ni, lntmsg[i], rc);
97 kiblnd_txlist_done(struct lnet_ni *ni, struct list_head *txlist, int status)
101 while (!list_empty(txlist)) {
102 tx = list_entry(txlist->next, struct kib_tx, tx_list);
104 list_del(&tx->tx_list);
107 tx->tx_status = status;
108 kiblnd_tx_done(ni, tx);
112 static struct kib_tx *
113 kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
115 struct kib_net *net = (struct kib_net *)ni->ni_data;
116 struct list_head *node;
118 struct kib_tx_poolset *tps;
120 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target)];
121 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
124 tx = list_entry(node, struct kib_tx, tx_list);
126 LASSERT(!tx->tx_nwrq);
127 LASSERT(!tx->tx_queued);
128 LASSERT(!tx->tx_sending);
129 LASSERT(!tx->tx_waiting);
130 LASSERT(!tx->tx_status);
131 LASSERT(!tx->tx_conn);
132 LASSERT(!tx->tx_lntmsg[0]);
133 LASSERT(!tx->tx_lntmsg[1]);
134 LASSERT(!tx->tx_nfrags);
140 kiblnd_drop_rx(struct kib_rx *rx)
142 struct kib_conn *conn = rx->rx_conn;
143 struct kib_sched_info *sched = conn->ibc_sched;
146 spin_lock_irqsave(&sched->ibs_lock, flags);
147 LASSERT(conn->ibc_nrx > 0);
149 spin_unlock_irqrestore(&sched->ibs_lock, flags);
151 kiblnd_conn_decref(conn);
155 kiblnd_post_rx(struct kib_rx *rx, int credit)
157 struct kib_conn *conn = rx->rx_conn;
158 struct kib_net *net = conn->ibc_peer->ibp_ni->ni_data;
159 struct ib_recv_wr *bad_wrq = NULL;
163 LASSERT(!in_interrupt());
164 LASSERT(credit == IBLND_POSTRX_NO_CREDIT ||
165 credit == IBLND_POSTRX_PEER_CREDIT ||
166 credit == IBLND_POSTRX_RSRVD_CREDIT);
168 rx->rx_sge.lkey = conn->ibc_hdev->ibh_pd->local_dma_lkey;
169 rx->rx_sge.addr = rx->rx_msgaddr;
170 rx->rx_sge.length = IBLND_MSG_SIZE;
172 rx->rx_wrq.next = NULL;
173 rx->rx_wrq.sg_list = &rx->rx_sge;
174 rx->rx_wrq.num_sge = 1;
175 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
177 LASSERT(conn->ibc_state >= IBLND_CONN_INIT);
178 LASSERT(rx->rx_nob >= 0); /* not posted */
180 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
181 kiblnd_drop_rx(rx); /* No more posts for this rx */
185 rx->rx_nob = -1; /* flag posted */
187 /* NB: need an extra reference after ib_post_recv because we don't
188 * own this rx (and rx::rx_conn) anymore, LU-5678.
190 kiblnd_conn_addref(conn);
191 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
193 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
194 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
198 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
202 kiblnd_close_conn(conn, rc);
203 kiblnd_drop_rx(rx); /* No more posts for this rx */
207 if (credit == IBLND_POSTRX_NO_CREDIT)
210 spin_lock(&conn->ibc_lock);
211 if (credit == IBLND_POSTRX_PEER_CREDIT)
212 conn->ibc_outstanding_credits++;
214 conn->ibc_reserved_credits++;
215 kiblnd_check_sends_locked(conn);
216 spin_unlock(&conn->ibc_lock);
219 kiblnd_conn_decref(conn);
223 static struct kib_tx *
224 kiblnd_find_waiting_tx_locked(struct kib_conn *conn, int txtype, __u64 cookie)
226 struct list_head *tmp;
228 list_for_each(tmp, &conn->ibc_active_txs) {
229 struct kib_tx *tx = list_entry(tmp, struct kib_tx, tx_list);
231 LASSERT(!tx->tx_queued);
232 LASSERT(tx->tx_sending || tx->tx_waiting);
234 if (tx->tx_cookie != cookie)
237 if (tx->tx_waiting &&
238 tx->tx_msg->ibm_type == txtype)
241 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
242 tx->tx_waiting ? "" : "NOT ",
243 tx->tx_msg->ibm_type, txtype);
249 kiblnd_handle_completion(struct kib_conn *conn, int txtype, int status, __u64 cookie)
252 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
255 spin_lock(&conn->ibc_lock);
257 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
259 spin_unlock(&conn->ibc_lock);
261 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
262 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
263 kiblnd_close_conn(conn, -EPROTO);
267 if (!tx->tx_status) { /* success so far */
268 if (status < 0) /* failed? */
269 tx->tx_status = status;
270 else if (txtype == IBLND_MSG_GET_REQ)
271 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
276 idle = !tx->tx_queued && !tx->tx_sending;
278 list_del(&tx->tx_list);
280 spin_unlock(&conn->ibc_lock);
283 kiblnd_tx_done(ni, tx);
287 kiblnd_send_completion(struct kib_conn *conn, int type, int status, __u64 cookie)
289 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
290 struct kib_tx *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
293 CERROR("Can't get tx for completion %x for %s\n",
294 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
298 tx->tx_msg->ibm_u.completion.ibcm_status = status;
299 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
300 kiblnd_init_tx_msg(ni, tx, type, sizeof(struct kib_completion_msg));
302 kiblnd_queue_tx(tx, conn);
306 kiblnd_handle_rx(struct kib_rx *rx)
308 struct kib_msg *msg = rx->rx_msg;
309 struct kib_conn *conn = rx->rx_conn;
310 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
311 int credits = msg->ibm_credits;
317 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
319 CDEBUG(D_NET, "Received %x[%d] from %s\n",
320 msg->ibm_type, credits,
321 libcfs_nid2str(conn->ibc_peer->ibp_nid));
324 /* Have I received credits that will let me send? */
325 spin_lock(&conn->ibc_lock);
327 if (conn->ibc_credits + credits >
328 conn->ibc_queue_depth) {
329 rc2 = conn->ibc_credits;
330 spin_unlock(&conn->ibc_lock);
332 CERROR("Bad credits from %s: %d + %d > %d\n",
333 libcfs_nid2str(conn->ibc_peer->ibp_nid),
334 rc2, credits, conn->ibc_queue_depth);
336 kiblnd_close_conn(conn, -EPROTO);
337 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
341 conn->ibc_credits += credits;
343 /* This ensures the credit taken by NOOP can be returned */
344 if (msg->ibm_type == IBLND_MSG_NOOP &&
345 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
346 conn->ibc_outstanding_credits++;
348 kiblnd_check_sends_locked(conn);
349 spin_unlock(&conn->ibc_lock);
352 switch (msg->ibm_type) {
354 CERROR("Bad IBLND message type %x from %s\n",
355 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
356 post_credit = IBLND_POSTRX_NO_CREDIT;
361 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
362 post_credit = IBLND_POSTRX_NO_CREDIT;
366 if (credits) /* credit already posted */
367 post_credit = IBLND_POSTRX_NO_CREDIT;
368 else /* a keepalive NOOP */
369 post_credit = IBLND_POSTRX_PEER_CREDIT;
372 case IBLND_MSG_IMMEDIATE:
373 post_credit = IBLND_POSTRX_DONT_POST;
374 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
375 msg->ibm_srcnid, rx, 0);
376 if (rc < 0) /* repost on error */
377 post_credit = IBLND_POSTRX_PEER_CREDIT;
380 case IBLND_MSG_PUT_REQ:
381 post_credit = IBLND_POSTRX_DONT_POST;
382 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
383 msg->ibm_srcnid, rx, 1);
384 if (rc < 0) /* repost on error */
385 post_credit = IBLND_POSTRX_PEER_CREDIT;
388 case IBLND_MSG_PUT_NAK:
389 CWARN("PUT_NACK from %s\n",
390 libcfs_nid2str(conn->ibc_peer->ibp_nid));
391 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
392 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
393 msg->ibm_u.completion.ibcm_status,
394 msg->ibm_u.completion.ibcm_cookie);
397 case IBLND_MSG_PUT_ACK:
398 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
400 spin_lock(&conn->ibc_lock);
401 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
402 msg->ibm_u.putack.ibpam_src_cookie);
404 list_del(&tx->tx_list);
405 spin_unlock(&conn->ibc_lock);
408 CERROR("Unmatched PUT_ACK from %s\n",
409 libcfs_nid2str(conn->ibc_peer->ibp_nid));
414 LASSERT(tx->tx_waiting);
416 * CAVEAT EMPTOR: I could be racing with tx_complete, but...
417 * (a) I can overwrite tx_msg since my peer has received it!
418 * (b) tx_waiting set tells tx_complete() it's not done.
420 tx->tx_nwrq = 0; /* overwrite PUT_REQ */
422 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
423 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
424 &msg->ibm_u.putack.ibpam_rd,
425 msg->ibm_u.putack.ibpam_dst_cookie);
427 CERROR("Can't setup rdma for PUT to %s: %d\n",
428 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
430 spin_lock(&conn->ibc_lock);
431 tx->tx_waiting = 0; /* clear waiting and queue atomically */
432 kiblnd_queue_tx_locked(tx, conn);
433 spin_unlock(&conn->ibc_lock);
436 case IBLND_MSG_PUT_DONE:
437 post_credit = IBLND_POSTRX_PEER_CREDIT;
438 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
439 msg->ibm_u.completion.ibcm_status,
440 msg->ibm_u.completion.ibcm_cookie);
443 case IBLND_MSG_GET_REQ:
444 post_credit = IBLND_POSTRX_DONT_POST;
445 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
446 msg->ibm_srcnid, rx, 1);
447 if (rc < 0) /* repost on error */
448 post_credit = IBLND_POSTRX_PEER_CREDIT;
451 case IBLND_MSG_GET_DONE:
452 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
453 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
454 msg->ibm_u.completion.ibcm_status,
455 msg->ibm_u.completion.ibcm_cookie);
459 if (rc < 0) /* protocol error */
460 kiblnd_close_conn(conn, rc);
462 if (post_credit != IBLND_POSTRX_DONT_POST)
463 kiblnd_post_rx(rx, post_credit);
467 kiblnd_rx_complete(struct kib_rx *rx, int status, int nob)
469 struct kib_msg *msg = rx->rx_msg;
470 struct kib_conn *conn = rx->rx_conn;
471 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
472 struct kib_net *net = ni->ni_data;
477 LASSERT(rx->rx_nob < 0); /* was posted */
478 rx->rx_nob = 0; /* isn't now */
480 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
483 if (status != IB_WC_SUCCESS) {
484 CNETERR("Rx from %s failed: %d\n",
485 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
492 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
494 CERROR("Error %d unpacking rx from %s\n",
495 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
499 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
500 msg->ibm_dstnid != ni->ni_nid ||
501 msg->ibm_srcstamp != conn->ibc_incarnation ||
502 msg->ibm_dststamp != net->ibn_incarnation) {
503 CERROR("Stale rx from %s\n",
504 libcfs_nid2str(conn->ibc_peer->ibp_nid));
509 /* set time last known alive */
510 kiblnd_peer_alive(conn->ibc_peer);
512 /* racing with connection establishment/teardown! */
514 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
515 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
518 write_lock_irqsave(g_lock, flags);
519 /* must check holding global lock to eliminate race */
520 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
521 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
522 write_unlock_irqrestore(g_lock, flags);
525 write_unlock_irqrestore(g_lock, flags);
527 kiblnd_handle_rx(rx);
531 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
532 kiblnd_close_conn(conn, err);
534 kiblnd_drop_rx(rx); /* Don't re-post rx. */
538 kiblnd_kvaddr_to_page(unsigned long vaddr)
542 if (is_vmalloc_addr((void *)vaddr)) {
543 page = vmalloc_to_page((void *)vaddr);
547 #ifdef CONFIG_HIGHMEM
548 if (vaddr >= PKMAP_BASE &&
549 vaddr < (PKMAP_BASE + LAST_PKMAP * PAGE_SIZE)) {
550 /* No highmem pages only used for bulk (kiov) I/O */
551 CERROR("find page for address in highmem\n");
555 page = virt_to_page(vaddr);
561 kiblnd_fmr_map_tx(struct kib_net *net, struct kib_tx *tx, struct kib_rdma_desc *rd, __u32 nob)
563 struct kib_hca_dev *hdev;
564 struct kib_fmr_poolset *fps;
568 LASSERT(tx->tx_pool);
569 LASSERT(tx->tx_pool->tpo_pool.po_owner);
571 hdev = tx->tx_pool->tpo_hdev;
572 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
574 fps = net->ibn_fmr_ps[cpt];
575 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->fmr);
577 CERROR("Can't map %u bytes: %d\n", nob, rc);
582 * If rd is not tx_rd, it's going to get sent to a peer, who will need
585 rd->rd_key = tx->fmr.fmr_key;
586 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
587 rd->rd_frags[0].rf_nob = nob;
593 static void kiblnd_unmap_tx(struct kib_tx *tx)
595 if (tx->fmr.fmr_pfmr || tx->fmr.fmr_frd)
596 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
599 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
600 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
605 static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx,
606 struct kib_rdma_desc *rd, int nfrags)
608 struct kib_net *net = ni->ni_data;
609 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
614 * If rd is not tx_rd, it's going to get sent to a peer and I'm the
617 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
618 tx->tx_nfrags = nfrags;
620 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
621 tx->tx_nfrags, tx->tx_dmadir);
623 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
624 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
625 hdev->ibh_ibdev, &tx->tx_frags[i]);
626 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
627 hdev->ibh_ibdev, &tx->tx_frags[i]);
628 nob += rd->rd_frags[i].rf_nob;
632 return kiblnd_fmr_map_tx(net, tx, rd, nob);
638 kiblnd_setup_rd_iov(struct lnet_ni *ni, struct kib_tx *tx,
639 struct kib_rdma_desc *rd, unsigned int niov,
640 const struct kvec *iov, int offset, int nob)
642 struct kib_net *net = ni->ni_data;
644 struct scatterlist *sg;
653 while (offset >= iov->iov_len) {
654 offset -= iov->iov_len;
664 vaddr = ((unsigned long)iov->iov_base) + offset;
665 page_offset = vaddr & (PAGE_SIZE - 1);
666 page = kiblnd_kvaddr_to_page(vaddr);
668 CERROR("Can't find page\n");
672 fragnob = min((int)(iov->iov_len - offset), nob);
673 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
675 sg_set_page(sg, page, fragnob, page_offset);
678 CERROR("lacking enough sg entries to map tx\n");
682 if (offset + fragnob < iov->iov_len) {
692 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
696 kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
697 struct kib_rdma_desc *rd, int nkiov,
698 const struct bio_vec *kiov, int offset, int nob)
700 struct kib_net *net = ni->ni_data;
701 struct scatterlist *sg;
704 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
710 while (offset >= kiov->bv_len) {
711 offset -= kiov->bv_len;
721 fragnob = min((int)(kiov->bv_len - offset), nob);
723 sg_set_page(sg, kiov->bv_page, fragnob,
724 kiov->bv_offset + offset);
727 CERROR("lacking enough sg entries to map tx\n");
737 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
741 kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
742 __must_hold(&conn->ibc_lock)
744 struct kib_msg *msg = tx->tx_msg;
745 struct kib_peer *peer = conn->ibc_peer;
746 struct lnet_ni *ni = peer->ibp_ni;
747 int ver = conn->ibc_version;
751 LASSERT(tx->tx_queued);
752 /* We rely on this for QP sizing */
753 LASSERT(tx->tx_nwrq > 0);
755 LASSERT(!credit || credit == 1);
756 LASSERT(conn->ibc_outstanding_credits >= 0);
757 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
758 LASSERT(conn->ibc_credits >= 0);
759 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
761 if (conn->ibc_nsends_posted == kiblnd_concurrent_sends(ver, ni)) {
762 /* tx completions outstanding... */
763 CDEBUG(D_NET, "%s: posted enough\n",
764 libcfs_nid2str(peer->ibp_nid));
768 if (credit && !conn->ibc_credits) { /* no credits */
769 CDEBUG(D_NET, "%s: no credits\n",
770 libcfs_nid2str(peer->ibp_nid));
774 if (credit && !IBLND_OOB_CAPABLE(ver) &&
775 conn->ibc_credits == 1 && /* last credit reserved */
776 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
777 CDEBUG(D_NET, "%s: not using last credit\n",
778 libcfs_nid2str(peer->ibp_nid));
782 /* NB don't drop ibc_lock before bumping tx_sending */
783 list_del(&tx->tx_list);
786 if (msg->ibm_type == IBLND_MSG_NOOP &&
787 (!kiblnd_need_noop(conn) || /* redundant NOOP */
788 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
789 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
791 * OK to drop when posted enough NOOPs, since
792 * kiblnd_check_sends_locked will queue NOOP again when
793 * posted NOOPs complete
795 spin_unlock(&conn->ibc_lock);
796 kiblnd_tx_done(peer->ibp_ni, tx);
797 spin_lock(&conn->ibc_lock);
798 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
799 libcfs_nid2str(peer->ibp_nid),
800 conn->ibc_noops_posted);
804 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
805 peer->ibp_nid, conn->ibc_incarnation);
807 conn->ibc_credits -= credit;
808 conn->ibc_outstanding_credits = 0;
809 conn->ibc_nsends_posted++;
810 if (msg->ibm_type == IBLND_MSG_NOOP)
811 conn->ibc_noops_posted++;
814 * CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
815 * PUT. If so, it was first queued here as a PUT_REQ, sent and
816 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
817 * and then re-queued here. It's (just) possible that
818 * tx_sending is non-zero if we've not done the tx_complete()
819 * from the first send; hence the ++ rather than = below.
822 list_add(&tx->tx_list, &conn->ibc_active_txs);
824 /* I'm still holding ibc_lock! */
825 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
827 } else if (tx->tx_pool->tpo_pool.po_failed ||
828 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
829 /* close_conn will launch failover */
832 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
833 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
834 struct ib_send_wr *wrq = &tx->tx_wrq[0].wr;
837 if (!frd->frd_valid) {
838 wrq = &frd->frd_inv_wr;
839 wrq->next = &frd->frd_fastreg_wr.wr;
841 wrq = &frd->frd_fastreg_wr.wr;
843 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
846 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
847 "bad wr_id %llx, opc %d, flags %d, peer: %s\n",
848 bad->wr_id, bad->opcode, bad->send_flags,
849 libcfs_nid2str(conn->ibc_peer->ibp_nid));
851 rc = ib_post_send(conn->ibc_cmid->qp, wrq, &bad);
854 conn->ibc_last_send = jiffies;
860 * NB credits are transferred in the actual
861 * message, which can only be the last work item
863 conn->ibc_credits += credit;
864 conn->ibc_outstanding_credits += msg->ibm_credits;
865 conn->ibc_nsends_posted--;
866 if (msg->ibm_type == IBLND_MSG_NOOP)
867 conn->ibc_noops_posted--;
873 done = !tx->tx_sending;
875 list_del(&tx->tx_list);
877 spin_unlock(&conn->ibc_lock);
879 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
880 CERROR("Error %d posting transmit to %s\n",
881 rc, libcfs_nid2str(peer->ibp_nid));
883 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
884 rc, libcfs_nid2str(peer->ibp_nid));
886 kiblnd_close_conn(conn, rc);
889 kiblnd_tx_done(peer->ibp_ni, tx);
891 spin_lock(&conn->ibc_lock);
897 kiblnd_check_sends_locked(struct kib_conn *conn)
899 int ver = conn->ibc_version;
900 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
903 /* Don't send anything until after the connection is established */
904 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
905 CDEBUG(D_NET, "%s too soon\n",
906 libcfs_nid2str(conn->ibc_peer->ibp_nid));
910 LASSERT(conn->ibc_nsends_posted <= kiblnd_concurrent_sends(ver, ni));
911 LASSERT(!IBLND_OOB_CAPABLE(ver) ||
912 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
913 LASSERT(conn->ibc_reserved_credits >= 0);
915 while (conn->ibc_reserved_credits > 0 &&
916 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
917 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
918 struct kib_tx, tx_list);
919 list_del(&tx->tx_list);
920 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
921 conn->ibc_reserved_credits--;
924 if (kiblnd_need_noop(conn)) {
925 spin_unlock(&conn->ibc_lock);
927 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
929 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
931 spin_lock(&conn->ibc_lock);
933 kiblnd_queue_tx_locked(tx, conn);
939 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
941 tx = list_entry(conn->ibc_tx_queue_nocred.next,
942 struct kib_tx, tx_list);
943 } else if (!list_empty(&conn->ibc_tx_noops)) {
944 LASSERT(!IBLND_OOB_CAPABLE(ver));
946 tx = list_entry(conn->ibc_tx_noops.next,
947 struct kib_tx, tx_list);
948 } else if (!list_empty(&conn->ibc_tx_queue)) {
950 tx = list_entry(conn->ibc_tx_queue.next,
951 struct kib_tx, tx_list);
956 if (kiblnd_post_tx_locked(conn, tx, credit))
962 kiblnd_tx_complete(struct kib_tx *tx, int status)
964 int failed = (status != IB_WC_SUCCESS);
965 struct kib_conn *conn = tx->tx_conn;
968 LASSERT(tx->tx_sending > 0);
971 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
972 CNETERR("Tx -> %s cookie %#llx sending %d waiting %d: failed %d\n",
973 libcfs_nid2str(conn->ibc_peer->ibp_nid),
974 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
977 kiblnd_close_conn(conn, -EIO);
979 kiblnd_peer_alive(conn->ibc_peer);
982 spin_lock(&conn->ibc_lock);
985 * I could be racing with rdma completion. Whoever makes 'tx' idle
986 * gets to free it, which also drops its ref on 'conn'.
989 conn->ibc_nsends_posted--;
990 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
991 conn->ibc_noops_posted--;
994 tx->tx_waiting = 0; /* don't wait for peer */
995 tx->tx_status = -EIO;
998 idle = !tx->tx_sending && /* This is the final callback */
999 !tx->tx_waiting && /* Not waiting for peer */
1000 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1002 list_del(&tx->tx_list);
1004 kiblnd_check_sends_locked(conn);
1005 spin_unlock(&conn->ibc_lock);
1008 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1012 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1015 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1016 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1017 struct ib_rdma_wr *wrq = &tx->tx_wrq[tx->tx_nwrq];
1018 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1020 LASSERT(tx->tx_nwrq >= 0);
1021 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1022 LASSERT(nob <= IBLND_MSG_SIZE);
1024 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1026 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1027 sge->addr = tx->tx_msgaddr;
1030 memset(wrq, 0, sizeof(*wrq));
1032 wrq->wr.next = NULL;
1033 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1034 wrq->wr.sg_list = sge;
1035 wrq->wr.num_sge = 1;
1036 wrq->wr.opcode = IB_WR_SEND;
1037 wrq->wr.send_flags = IB_SEND_SIGNALED;
1043 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1044 int resid, struct kib_rdma_desc *dstrd, __u64 dstcookie)
1046 struct kib_msg *ibmsg = tx->tx_msg;
1047 struct kib_rdma_desc *srcrd = tx->tx_rd;
1048 struct ib_sge *sge = &tx->tx_sge[0];
1049 struct ib_rdma_wr *wrq, *next;
1055 LASSERT(!in_interrupt());
1056 LASSERT(!tx->tx_nwrq);
1057 LASSERT(type == IBLND_MSG_GET_DONE ||
1058 type == IBLND_MSG_PUT_DONE);
1060 if (kiblnd_rd_size(srcrd) > conn->ibc_max_frags << PAGE_SHIFT) {
1061 CERROR("RDMA is too large for peer %s (%d), src size: %d dst size: %d\n",
1062 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1063 conn->ibc_max_frags << PAGE_SHIFT,
1064 kiblnd_rd_size(srcrd), kiblnd_rd_size(dstrd));
1070 if (srcidx >= srcrd->rd_nfrags) {
1071 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1076 if (dstidx == dstrd->rd_nfrags) {
1077 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1082 if (tx->tx_nwrq >= IBLND_MAX_RDMA_FRAGS) {
1083 CERROR("RDMA has too many fragments for peer %s (%d), src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1084 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1085 IBLND_MAX_RDMA_FRAGS,
1086 srcidx, srcrd->rd_nfrags,
1087 dstidx, dstrd->rd_nfrags);
1092 wrknob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1093 kiblnd_rd_frag_size(dstrd, dstidx),
1096 sge = &tx->tx_sge[tx->tx_nwrq];
1097 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1098 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1099 sge->length = wrknob;
1101 wrq = &tx->tx_wrq[tx->tx_nwrq];
1104 wrq->wr.next = &next->wr;
1105 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1106 wrq->wr.sg_list = sge;
1107 wrq->wr.num_sge = 1;
1108 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1109 wrq->wr.send_flags = 0;
1111 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1112 wrq->rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1114 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1115 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1124 if (rc < 0) /* no RDMA if completing with failure */
1127 ibmsg->ibm_u.completion.ibcm_status = rc;
1128 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1129 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1130 type, sizeof(struct kib_completion_msg));
1136 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1138 struct list_head *q;
1140 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1141 LASSERT(!tx->tx_queued); /* not queued for sending already */
1142 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1145 tx->tx_deadline = jiffies +
1146 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1150 kiblnd_conn_addref(conn);
1152 LASSERT(tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1154 /* PUT_DONE first attached to conn as a PUT_REQ */
1155 LASSERT(tx->tx_conn == conn);
1156 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1159 switch (tx->tx_msg->ibm_type) {
1163 case IBLND_MSG_PUT_REQ:
1164 case IBLND_MSG_GET_REQ:
1165 q = &conn->ibc_tx_queue_rsrvd;
1168 case IBLND_MSG_PUT_NAK:
1169 case IBLND_MSG_PUT_ACK:
1170 case IBLND_MSG_PUT_DONE:
1171 case IBLND_MSG_GET_DONE:
1172 q = &conn->ibc_tx_queue_nocred;
1175 case IBLND_MSG_NOOP:
1176 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1177 q = &conn->ibc_tx_queue_nocred;
1179 q = &conn->ibc_tx_noops;
1182 case IBLND_MSG_IMMEDIATE:
1183 q = &conn->ibc_tx_queue;
1187 list_add_tail(&tx->tx_list, q);
1191 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1193 spin_lock(&conn->ibc_lock);
1194 kiblnd_queue_tx_locked(tx, conn);
1195 kiblnd_check_sends_locked(conn);
1196 spin_unlock(&conn->ibc_lock);
1199 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1200 struct sockaddr_in *srcaddr,
1201 struct sockaddr_in *dstaddr,
1204 unsigned short port;
1207 /* allow the port to be reused */
1208 rc = rdma_set_reuseaddr(cmid, 1);
1210 CERROR("Unable to set reuse on cmid: %d\n", rc);
1214 /* look for a free privileged port */
1215 for (port = PROT_SOCK - 1; port > 0; port--) {
1216 srcaddr->sin_port = htons(port);
1217 rc = rdma_resolve_addr(cmid,
1218 (struct sockaddr *)srcaddr,
1219 (struct sockaddr *)dstaddr,
1222 CDEBUG(D_NET, "bound to port %hu\n", port);
1224 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1225 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1232 CERROR("Failed to bind to a free privileged port\n");
1237 kiblnd_connect_peer(struct kib_peer *peer)
1239 struct rdma_cm_id *cmid;
1240 struct kib_dev *dev;
1241 struct kib_net *net = peer->ibp_ni->ni_data;
1242 struct sockaddr_in srcaddr;
1243 struct sockaddr_in dstaddr;
1247 LASSERT(peer->ibp_connecting > 0);
1248 LASSERT(!peer->ibp_reconnecting);
1250 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1254 CERROR("Can't create CMID for %s: %ld\n",
1255 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1261 memset(&srcaddr, 0, sizeof(srcaddr));
1262 srcaddr.sin_family = AF_INET;
1263 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1265 memset(&dstaddr, 0, sizeof(dstaddr));
1266 dstaddr.sin_family = AF_INET;
1267 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1268 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1270 kiblnd_peer_addref(peer); /* cmid's ref */
1272 if (*kiblnd_tunables.kib_use_priv_port) {
1273 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1274 *kiblnd_tunables.kib_timeout * 1000);
1276 rc = rdma_resolve_addr(cmid,
1277 (struct sockaddr *)&srcaddr,
1278 (struct sockaddr *)&dstaddr,
1279 *kiblnd_tunables.kib_timeout * 1000);
1282 /* Can't initiate address resolution: */
1283 CERROR("Can't resolve addr for %s: %d\n",
1284 libcfs_nid2str(peer->ibp_nid), rc);
1291 kiblnd_peer_connect_failed(peer, 1, rc);
1292 kiblnd_peer_decref(peer); /* cmid's ref */
1293 rdma_destroy_id(cmid);
1296 kiblnd_peer_connect_failed(peer, 1, rc);
1300 kiblnd_reconnect_peer(struct kib_peer *peer)
1302 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1303 char *reason = NULL;
1304 struct list_head txs;
1305 unsigned long flags;
1307 INIT_LIST_HEAD(&txs);
1309 write_lock_irqsave(glock, flags);
1310 if (!peer->ibp_reconnecting) {
1311 if (peer->ibp_accepting)
1312 reason = "accepting";
1313 else if (peer->ibp_connecting)
1314 reason = "connecting";
1315 else if (!list_empty(&peer->ibp_conns))
1316 reason = "connected";
1317 else /* connected then closed */
1323 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1324 list_empty(&peer->ibp_conns));
1325 peer->ibp_reconnecting = 0;
1327 if (!kiblnd_peer_active(peer)) {
1328 list_splice_init(&peer->ibp_tx_queue, &txs);
1329 reason = "unlinked";
1333 peer->ibp_connecting++;
1334 peer->ibp_reconnected++;
1335 write_unlock_irqrestore(glock, flags);
1337 kiblnd_connect_peer(peer);
1341 write_unlock_irqrestore(glock, flags);
1343 CWARN("Abort reconnection of %s: %s\n",
1344 libcfs_nid2str(peer->ibp_nid), reason);
1345 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1350 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1352 struct kib_peer *peer;
1353 struct kib_peer *peer2;
1354 struct kib_conn *conn;
1355 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1356 unsigned long flags;
1360 * If I get here, I've committed to send, so I complete the tx with
1361 * failure on any problems
1363 LASSERT(!tx || !tx->tx_conn); /* only set when assigned a conn */
1364 LASSERT(!tx || tx->tx_nwrq > 0); /* work items have been set up */
1367 * First time, just use a read lock since I expect to find my peer
1370 read_lock_irqsave(g_lock, flags);
1372 peer = kiblnd_find_peer_locked(nid);
1373 if (peer && !list_empty(&peer->ibp_conns)) {
1374 /* Found a peer with an established connection */
1375 conn = kiblnd_get_conn_locked(peer);
1376 kiblnd_conn_addref(conn); /* 1 ref for me... */
1378 read_unlock_irqrestore(g_lock, flags);
1381 kiblnd_queue_tx(tx, conn);
1382 kiblnd_conn_decref(conn); /* ...to here */
1386 read_unlock(g_lock);
1387 /* Re-try with a write lock */
1390 peer = kiblnd_find_peer_locked(nid);
1392 if (list_empty(&peer->ibp_conns)) {
1393 /* found a peer, but it's still connecting... */
1394 LASSERT(kiblnd_peer_connecting(peer));
1396 list_add_tail(&tx->tx_list,
1397 &peer->ibp_tx_queue);
1398 write_unlock_irqrestore(g_lock, flags);
1400 conn = kiblnd_get_conn_locked(peer);
1401 kiblnd_conn_addref(conn); /* 1 ref for me... */
1403 write_unlock_irqrestore(g_lock, flags);
1406 kiblnd_queue_tx(tx, conn);
1407 kiblnd_conn_decref(conn); /* ...to here */
1412 write_unlock_irqrestore(g_lock, flags);
1414 /* Allocate a peer ready to add to the peer table and retry */
1415 rc = kiblnd_create_peer(ni, &peer, nid);
1417 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1419 tx->tx_status = -EHOSTUNREACH;
1421 kiblnd_tx_done(ni, tx);
1426 write_lock_irqsave(g_lock, flags);
1428 peer2 = kiblnd_find_peer_locked(nid);
1430 if (list_empty(&peer2->ibp_conns)) {
1431 /* found a peer, but it's still connecting... */
1432 LASSERT(kiblnd_peer_connecting(peer2));
1434 list_add_tail(&tx->tx_list,
1435 &peer2->ibp_tx_queue);
1436 write_unlock_irqrestore(g_lock, flags);
1438 conn = kiblnd_get_conn_locked(peer2);
1439 kiblnd_conn_addref(conn); /* 1 ref for me... */
1441 write_unlock_irqrestore(g_lock, flags);
1444 kiblnd_queue_tx(tx, conn);
1445 kiblnd_conn_decref(conn); /* ...to here */
1448 kiblnd_peer_decref(peer);
1452 /* Brand new peer */
1453 LASSERT(!peer->ibp_connecting);
1454 peer->ibp_connecting = 1;
1456 /* always called with a ref on ni, which prevents ni being shutdown */
1457 LASSERT(!((struct kib_net *)ni->ni_data)->ibn_shutdown);
1460 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1462 kiblnd_peer_addref(peer);
1463 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1465 write_unlock_irqrestore(g_lock, flags);
1467 kiblnd_connect_peer(peer);
1468 kiblnd_peer_decref(peer);
1472 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1474 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1475 int type = lntmsg->msg_type;
1476 struct lnet_process_id target = lntmsg->msg_target;
1477 int target_is_router = lntmsg->msg_target_is_router;
1478 int routing = lntmsg->msg_routing;
1479 unsigned int payload_niov = lntmsg->msg_niov;
1480 struct kvec *payload_iov = lntmsg->msg_iov;
1481 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1482 unsigned int payload_offset = lntmsg->msg_offset;
1483 unsigned int payload_nob = lntmsg->msg_len;
1484 struct iov_iter from;
1485 struct kib_msg *ibmsg;
1486 struct kib_rdma_desc *rd;
1491 /* NB 'private' is different depending on what we're sending.... */
1493 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1494 payload_nob, payload_niov, libcfs_id2str(target));
1496 LASSERT(!payload_nob || payload_niov > 0);
1497 LASSERT(payload_niov <= LNET_MAX_IOV);
1499 /* Thread context */
1500 LASSERT(!in_interrupt());
1501 /* payload is either all vaddrs or all pages */
1502 LASSERT(!(payload_kiov && payload_iov));
1505 iov_iter_bvec(&from, ITER_BVEC | WRITE,
1506 payload_kiov, payload_niov,
1507 payload_nob + payload_offset);
1509 iov_iter_kvec(&from, ITER_KVEC | WRITE,
1510 payload_iov, payload_niov,
1511 payload_nob + payload_offset);
1513 iov_iter_advance(&from, payload_offset);
1521 LASSERT(!payload_nob);
1525 if (routing || target_is_router)
1526 break; /* send IMMEDIATE */
1528 /* is the REPLY message too small for RDMA? */
1529 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1530 if (nob <= IBLND_MSG_SIZE)
1531 break; /* send IMMEDIATE */
1533 tx = kiblnd_get_idle_tx(ni, target.nid);
1535 CERROR("Can't allocate txd for GET to %s\n",
1536 libcfs_nid2str(target.nid));
1541 rd = &ibmsg->ibm_u.get.ibgm_rd;
1542 if (!(lntmsg->msg_md->md_options & LNET_MD_KIOV))
1543 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1544 lntmsg->msg_md->md_niov,
1545 lntmsg->msg_md->md_iov.iov,
1546 0, lntmsg->msg_md->md_length);
1548 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1549 lntmsg->msg_md->md_niov,
1550 lntmsg->msg_md->md_iov.kiov,
1551 0, lntmsg->msg_md->md_length);
1553 CERROR("Can't setup GET sink for %s: %d\n",
1554 libcfs_nid2str(target.nid), rc);
1555 kiblnd_tx_done(ni, tx);
1559 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1560 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1561 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1563 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1565 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1566 if (!tx->tx_lntmsg[1]) {
1567 CERROR("Can't create reply for GET -> %s\n",
1568 libcfs_nid2str(target.nid));
1569 kiblnd_tx_done(ni, tx);
1573 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1574 tx->tx_waiting = 1; /* waiting for GET_DONE */
1575 kiblnd_launch_tx(ni, tx, target.nid);
1578 case LNET_MSG_REPLY:
1580 /* Is the payload small enough not to need RDMA? */
1581 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1582 if (nob <= IBLND_MSG_SIZE)
1583 break; /* send IMMEDIATE */
1585 tx = kiblnd_get_idle_tx(ni, target.nid);
1587 CERROR("Can't allocate %s txd for %s\n",
1588 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1589 libcfs_nid2str(target.nid));
1594 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1595 payload_niov, payload_iov,
1596 payload_offset, payload_nob);
1598 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1599 payload_niov, payload_kiov,
1600 payload_offset, payload_nob);
1602 CERROR("Can't setup PUT src for %s: %d\n",
1603 libcfs_nid2str(target.nid), rc);
1604 kiblnd_tx_done(ni, tx);
1609 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1610 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1611 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(struct kib_putreq_msg));
1613 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1614 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1615 kiblnd_launch_tx(ni, tx, target.nid);
1619 /* send IMMEDIATE */
1621 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1624 tx = kiblnd_get_idle_tx(ni, target.nid);
1626 CERROR("Can't send %d to %s: tx descs exhausted\n",
1627 type, libcfs_nid2str(target.nid));
1632 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1634 rc = copy_from_iter(&ibmsg->ibm_u.immediate.ibim_payload, payload_nob,
1636 if (rc != payload_nob) {
1637 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
1641 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1642 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1644 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1645 kiblnd_launch_tx(ni, tx, target.nid);
1650 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1652 struct lnet_process_id target = lntmsg->msg_target;
1653 unsigned int niov = lntmsg->msg_niov;
1654 struct kvec *iov = lntmsg->msg_iov;
1655 struct bio_vec *kiov = lntmsg->msg_kiov;
1656 unsigned int offset = lntmsg->msg_offset;
1657 unsigned int nob = lntmsg->msg_len;
1661 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1663 CERROR("Can't get tx for REPLY to %s\n",
1664 libcfs_nid2str(target.nid));
1671 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1672 niov, iov, offset, nob);
1674 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1675 niov, kiov, offset, nob);
1678 CERROR("Can't setup GET src for %s: %d\n",
1679 libcfs_nid2str(target.nid), rc);
1683 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1684 IBLND_MSG_GET_DONE, nob,
1685 &rx->rx_msg->ibm_u.get.ibgm_rd,
1686 rx->rx_msg->ibm_u.get.ibgm_cookie);
1688 CERROR("Can't setup rdma for GET from %s: %d\n",
1689 libcfs_nid2str(target.nid), rc);
1694 /* No RDMA: local completion may happen now! */
1695 lnet_finalize(ni, lntmsg, 0);
1697 /* RDMA: lnet_finalize(lntmsg) when it completes */
1698 tx->tx_lntmsg[0] = lntmsg;
1701 kiblnd_queue_tx(tx, rx->rx_conn);
1705 kiblnd_tx_done(ni, tx);
1707 lnet_finalize(ni, lntmsg, -EIO);
1711 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1712 int delayed, struct iov_iter *to, unsigned int rlen)
1714 struct kib_rx *rx = private;
1715 struct kib_msg *rxmsg = rx->rx_msg;
1716 struct kib_conn *conn = rx->rx_conn;
1719 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1722 LASSERT(iov_iter_count(to) <= rlen);
1723 LASSERT(!in_interrupt());
1724 /* Either all pages or all vaddrs */
1726 switch (rxmsg->ibm_type) {
1730 case IBLND_MSG_IMMEDIATE:
1731 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1732 if (nob > rx->rx_nob) {
1733 CERROR("Immediate message from %s too big: %d(%d)\n",
1734 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1740 rc = copy_to_iter(&rxmsg->ibm_u.immediate.ibim_payload, rlen,
1748 lnet_finalize(ni, lntmsg, 0);
1751 case IBLND_MSG_PUT_REQ: {
1752 struct kib_msg *txmsg;
1753 struct kib_rdma_desc *rd;
1755 if (!iov_iter_count(to)) {
1756 lnet_finalize(ni, lntmsg, 0);
1757 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1758 rxmsg->ibm_u.putreq.ibprm_cookie);
1762 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1764 CERROR("Can't allocate tx for %s\n",
1765 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1766 /* Not replying will break the connection */
1772 rd = &txmsg->ibm_u.putack.ibpam_rd;
1773 if (!(to->type & ITER_BVEC))
1774 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1775 to->nr_segs, to->kvec,
1777 iov_iter_count(to));
1779 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1780 to->nr_segs, to->bvec,
1782 iov_iter_count(to));
1784 CERROR("Can't setup PUT sink for %s: %d\n",
1785 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1786 kiblnd_tx_done(ni, tx);
1787 /* tell peer it's over */
1788 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1789 rxmsg->ibm_u.putreq.ibprm_cookie);
1793 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1794 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1795 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1797 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1799 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1800 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1801 kiblnd_queue_tx(tx, conn);
1803 /* reposted buffer reserved for PUT_DONE */
1804 post_credit = IBLND_POSTRX_NO_CREDIT;
1808 case IBLND_MSG_GET_REQ:
1810 /* Optimized GET; RDMA lntmsg's payload */
1811 kiblnd_reply(ni, rx, lntmsg);
1813 /* GET didn't match anything */
1814 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1816 rxmsg->ibm_u.get.ibgm_cookie);
1821 kiblnd_post_rx(rx, post_credit);
1826 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1828 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1831 return PTR_ERR(task);
1833 atomic_inc(&kiblnd_data.kib_nthreads);
1838 kiblnd_thread_fini(void)
1840 atomic_dec(&kiblnd_data.kib_nthreads);
1844 kiblnd_peer_alive(struct kib_peer *peer)
1846 /* This is racy, but everyone's only writing cfs_time_current() */
1847 peer->ibp_last_alive = cfs_time_current();
1852 kiblnd_peer_notify(struct kib_peer *peer)
1855 unsigned long last_alive = 0;
1856 unsigned long flags;
1858 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1860 if (kiblnd_peer_idle(peer) && peer->ibp_error) {
1861 error = peer->ibp_error;
1862 peer->ibp_error = 0;
1864 last_alive = peer->ibp_last_alive;
1867 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1870 lnet_notify(peer->ibp_ni,
1871 peer->ibp_nid, 0, last_alive);
1875 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
1878 * This just does the immediate housekeeping. 'error' is zero for a
1879 * normal shutdown which can happen only after the connection has been
1880 * established. If the connection is established, schedule the
1881 * connection to be finished off by the connd. Otherwise the connd is
1882 * already dealing with it (either to set it up or tear it down).
1883 * Caller holds kib_global_lock exclusively in irq context
1885 struct kib_peer *peer = conn->ibc_peer;
1886 struct kib_dev *dev;
1887 unsigned long flags;
1889 LASSERT(error || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1891 if (error && !conn->ibc_comms_error)
1892 conn->ibc_comms_error = error;
1894 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1895 return; /* already being handled */
1898 list_empty(&conn->ibc_tx_noops) &&
1899 list_empty(&conn->ibc_tx_queue) &&
1900 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1901 list_empty(&conn->ibc_tx_queue_nocred) &&
1902 list_empty(&conn->ibc_active_txs)) {
1903 CDEBUG(D_NET, "closing conn to %s\n",
1904 libcfs_nid2str(peer->ibp_nid));
1906 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1907 libcfs_nid2str(peer->ibp_nid), error,
1908 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1909 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1910 list_empty(&conn->ibc_tx_queue_rsrvd) ? "" : "(sending_rsrvd)",
1911 list_empty(&conn->ibc_tx_queue_nocred) ? "" : "(sending_nocred)",
1912 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1915 dev = ((struct kib_net *)peer->ibp_ni->ni_data)->ibn_dev;
1916 list_del(&conn->ibc_list);
1917 /* connd (see below) takes over ibc_list's ref */
1919 if (list_empty(&peer->ibp_conns) && /* no more conns */
1920 kiblnd_peer_active(peer)) { /* still in peer table */
1921 kiblnd_unlink_peer_locked(peer);
1923 /* set/clear error on last conn */
1924 peer->ibp_error = conn->ibc_comms_error;
1927 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1930 kiblnd_dev_can_failover(dev)) {
1931 list_add_tail(&dev->ibd_fail_list,
1932 &kiblnd_data.kib_failed_devs);
1933 wake_up(&kiblnd_data.kib_failover_waitq);
1936 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1938 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1939 wake_up(&kiblnd_data.kib_connd_waitq);
1941 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1945 kiblnd_close_conn(struct kib_conn *conn, int error)
1947 unsigned long flags;
1949 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1951 kiblnd_close_conn_locked(conn, error);
1953 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1957 kiblnd_handle_early_rxs(struct kib_conn *conn)
1959 unsigned long flags;
1963 LASSERT(!in_interrupt());
1964 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1966 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1967 list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
1968 list_del(&rx->rx_list);
1969 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1971 kiblnd_handle_rx(rx);
1973 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1975 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1979 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
1982 struct list_head *tmp;
1983 struct list_head *nxt;
1986 spin_lock(&conn->ibc_lock);
1988 list_for_each_safe(tmp, nxt, txs) {
1989 tx = list_entry(tmp, struct kib_tx, tx_list);
1991 if (txs == &conn->ibc_active_txs) {
1992 LASSERT(!tx->tx_queued);
1993 LASSERT(tx->tx_waiting || tx->tx_sending);
1995 LASSERT(tx->tx_queued);
1998 tx->tx_status = -ECONNABORTED;
2001 if (!tx->tx_sending) {
2003 list_del(&tx->tx_list);
2004 list_add(&tx->tx_list, &zombies);
2008 spin_unlock(&conn->ibc_lock);
2010 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2014 kiblnd_finalise_conn(struct kib_conn *conn)
2016 LASSERT(!in_interrupt());
2017 LASSERT(conn->ibc_state > IBLND_CONN_INIT);
2019 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2022 * abort_receives moves QP state to IB_QPS_ERR. This is only required
2023 * for connections that didn't get as far as being connected, because
2024 * rdma_disconnect() does this for free.
2026 kiblnd_abort_receives(conn);
2029 * Complete all tx descs not waiting for sends to complete.
2030 * NB we should be safe from RDMA now that the QP has changed state
2032 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2033 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2034 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2035 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2036 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2038 kiblnd_handle_early_rxs(conn);
2042 kiblnd_peer_connect_failed(struct kib_peer *peer, int active, int error)
2045 unsigned long flags;
2048 LASSERT(!in_interrupt());
2050 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2053 LASSERT(peer->ibp_connecting > 0);
2054 peer->ibp_connecting--;
2056 LASSERT(peer->ibp_accepting > 0);
2057 peer->ibp_accepting--;
2060 if (kiblnd_peer_connecting(peer)) {
2061 /* another connection attempt under way... */
2062 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2067 peer->ibp_reconnected = 0;
2068 if (list_empty(&peer->ibp_conns)) {
2069 /* Take peer's blocked transmits to complete with error */
2070 list_add(&zombies, &peer->ibp_tx_queue);
2071 list_del_init(&peer->ibp_tx_queue);
2073 if (kiblnd_peer_active(peer))
2074 kiblnd_unlink_peer_locked(peer);
2076 peer->ibp_error = error;
2078 /* Can't have blocked transmits if there are connections */
2079 LASSERT(list_empty(&peer->ibp_tx_queue));
2082 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2084 kiblnd_peer_notify(peer);
2086 if (list_empty(&zombies))
2089 CNETERR("Deleting messages for %s: connection failed\n",
2090 libcfs_nid2str(peer->ibp_nid));
2092 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2096 kiblnd_connreq_done(struct kib_conn *conn, int status)
2098 struct kib_peer *peer = conn->ibc_peer;
2101 struct list_head txs;
2102 unsigned long flags;
2105 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2107 CDEBUG(D_NET, "%s: active(%d), version(%x), status(%d)\n",
2108 libcfs_nid2str(peer->ibp_nid), active,
2109 conn->ibc_version, status);
2111 LASSERT(!in_interrupt());
2112 LASSERT((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2113 peer->ibp_connecting > 0) ||
2114 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2115 peer->ibp_accepting > 0));
2117 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2118 conn->ibc_connvars = NULL;
2121 /* failed to establish connection */
2122 kiblnd_peer_connect_failed(peer, active, status);
2123 kiblnd_finalise_conn(conn);
2127 /* connection established */
2128 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2130 conn->ibc_last_send = jiffies;
2131 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2132 kiblnd_peer_alive(peer);
2135 * Add conn to peer's list and nuke any dangling conns from a different
2138 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2139 list_add(&conn->ibc_list, &peer->ibp_conns);
2140 peer->ibp_reconnected = 0;
2142 peer->ibp_connecting--;
2144 peer->ibp_accepting--;
2146 if (!peer->ibp_version) {
2147 peer->ibp_version = conn->ibc_version;
2148 peer->ibp_incarnation = conn->ibc_incarnation;
2151 if (peer->ibp_version != conn->ibc_version ||
2152 peer->ibp_incarnation != conn->ibc_incarnation) {
2153 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2154 conn->ibc_incarnation);
2155 peer->ibp_version = conn->ibc_version;
2156 peer->ibp_incarnation = conn->ibc_incarnation;
2159 /* grab pending txs while I have the lock */
2160 list_add(&txs, &peer->ibp_tx_queue);
2161 list_del_init(&peer->ibp_tx_queue);
2163 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2164 conn->ibc_comms_error) { /* error has happened already */
2165 struct lnet_ni *ni = peer->ibp_ni;
2167 /* start to shut down connection */
2168 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2169 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2171 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2177 * +1 ref for myself, this connection is visible to other threads
2178 * now, refcount of peer:ibp_conns can be released by connection
2179 * close from either a different thread, or the calling of
2180 * kiblnd_check_sends_locked() below. See bz21911 for details.
2182 kiblnd_conn_addref(conn);
2183 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2185 /* Schedule blocked txs */
2186 spin_lock(&conn->ibc_lock);
2187 list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
2188 list_del(&tx->tx_list);
2190 kiblnd_queue_tx_locked(tx, conn);
2192 kiblnd_check_sends_locked(conn);
2193 spin_unlock(&conn->ibc_lock);
2195 /* schedule blocked rxs */
2196 kiblnd_handle_early_rxs(conn);
2198 kiblnd_conn_decref(conn);
2202 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2206 rc = rdma_reject(cmid, rej, sizeof(*rej));
2209 CWARN("Error %d sending reject\n", rc);
2213 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2215 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2216 struct kib_msg *reqmsg = priv;
2217 struct kib_msg *ackmsg;
2218 struct kib_dev *ibdev;
2219 struct kib_peer *peer;
2220 struct kib_peer *peer2;
2221 struct kib_conn *conn;
2222 struct lnet_ni *ni = NULL;
2223 struct kib_net *net = NULL;
2225 struct rdma_conn_param cp;
2227 int version = IBLND_MSG_VERSION;
2228 unsigned long flags;
2231 struct sockaddr_in *peer_addr;
2233 LASSERT(!in_interrupt());
2235 /* cmid inherits 'context' from the corresponding listener id */
2236 ibdev = (struct kib_dev *)cmid->context;
2239 memset(&rej, 0, sizeof(rej));
2240 rej.ibr_magic = IBLND_MSG_MAGIC;
2241 rej.ibr_why = IBLND_REJECT_FATAL;
2242 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2244 peer_addr = (struct sockaddr_in *)&cmid->route.addr.dst_addr;
2245 if (*kiblnd_tunables.kib_require_priv_port &&
2246 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2247 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2249 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2250 &ip, ntohs(peer_addr->sin_port));
2254 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2255 CERROR("Short connection request\n");
2260 * Future protocol version compatibility support! If the
2261 * o2iblnd-specific protocol changes, or when LNET unifies
2262 * protocols over all LNDs, the initial connection will
2263 * negotiate a protocol version. I trap this here to avoid
2264 * console errors; the reject tells the peer which protocol I
2267 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2268 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2270 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2271 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2272 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2274 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2275 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2276 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2279 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2281 CERROR("Can't parse connection request: %d\n", rc);
2285 nid = reqmsg->ibm_srcnid;
2286 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2289 net = (struct kib_net *)ni->ni_data;
2290 rej.ibr_incarnation = net->ibn_incarnation;
2293 if (!ni || /* no matching net */
2294 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2295 net->ibn_dev != ibdev) { /* wrong device */
2296 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): bad dst nid %s\n",
2297 libcfs_nid2str(nid),
2298 !ni ? "NA" : libcfs_nid2str(ni->ni_nid),
2299 ibdev->ibd_ifname, ibdev->ibd_nnets,
2301 libcfs_nid2str(reqmsg->ibm_dstnid));
2306 /* check time stamp as soon as possible */
2307 if (reqmsg->ibm_dststamp &&
2308 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2309 CWARN("Stale connection request\n");
2310 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2314 /* I can accept peer's version */
2315 version = reqmsg->ibm_version;
2317 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2318 CERROR("Unexpected connreq msg type: %x from %s\n",
2319 reqmsg->ibm_type, libcfs_nid2str(nid));
2323 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2324 kiblnd_msg_queue_size(version, ni)) {
2325 CERROR("Can't accept conn from %s, queue depth too large: %d (<=%d wanted)\n",
2326 libcfs_nid2str(nid),
2327 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2328 kiblnd_msg_queue_size(version, ni));
2330 if (version == IBLND_MSG_VERSION)
2331 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2336 max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags >> IBLND_FRAG_SHIFT;
2337 if (max_frags > kiblnd_rdma_frags(version, ni)) {
2338 CWARN("Can't accept conn from %s (version %x): max message size %d is too large (%d wanted)\n",
2339 libcfs_nid2str(nid), version, max_frags,
2340 kiblnd_rdma_frags(version, ni));
2342 if (version >= IBLND_MSG_VERSION)
2343 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2346 } else if (max_frags < kiblnd_rdma_frags(version, ni) &&
2348 CWARN("Can't accept conn from %s (version %x): max message size %d incompatible without FMR pool (%d wanted)\n",
2349 libcfs_nid2str(nid), version, max_frags,
2350 kiblnd_rdma_frags(version, ni));
2352 if (version == IBLND_MSG_VERSION)
2353 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2358 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2359 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2360 libcfs_nid2str(nid),
2361 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2366 /* assume 'nid' is a new peer; create */
2367 rc = kiblnd_create_peer(ni, &peer, nid);
2369 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2370 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2374 /* We have validated the peer's parameters so use those */
2375 peer->ibp_max_frags = max_frags;
2376 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2378 write_lock_irqsave(g_lock, flags);
2380 peer2 = kiblnd_find_peer_locked(nid);
2382 if (!peer2->ibp_version) {
2383 peer2->ibp_version = version;
2384 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2387 /* not the guy I've talked with */
2388 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2389 peer2->ibp_version != version) {
2390 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2392 if (kiblnd_peer_active(peer2)) {
2393 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2394 peer2->ibp_version = version;
2396 write_unlock_irqrestore(g_lock, flags);
2398 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2399 libcfs_nid2str(nid), peer2->ibp_version, version,
2400 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2402 kiblnd_peer_decref(peer);
2403 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2408 * Tie-break connection race in favour of the higher NID.
2409 * If we keep running into a race condition multiple times,
2410 * we have to assume that the connection attempt with the
2411 * higher NID is stuck in a connecting state and will never
2412 * recover. As such, we pass through this if-block and let
2413 * the lower NID connection win so we can move forward.
2415 if (peer2->ibp_connecting &&
2416 nid < ni->ni_nid && peer2->ibp_races <
2417 MAX_CONN_RACES_BEFORE_ABORT) {
2419 write_unlock_irqrestore(g_lock, flags);
2421 CDEBUG(D_NET, "Conn race %s\n",
2422 libcfs_nid2str(peer2->ibp_nid));
2424 kiblnd_peer_decref(peer);
2425 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2428 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2429 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2430 libcfs_nid2str(peer2->ibp_nid),
2431 MAX_CONN_RACES_BEFORE_ABORT);
2433 * passive connection is allowed even this peer is waiting for
2436 peer2->ibp_reconnecting = 0;
2437 peer2->ibp_races = 0;
2438 peer2->ibp_accepting++;
2439 kiblnd_peer_addref(peer2);
2442 * Race with kiblnd_launch_tx (active connect) to create peer
2443 * so copy validated parameters since we now know what the
2446 peer2->ibp_max_frags = peer->ibp_max_frags;
2447 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2449 write_unlock_irqrestore(g_lock, flags);
2450 kiblnd_peer_decref(peer);
2453 /* Brand new peer */
2454 LASSERT(!peer->ibp_accepting);
2455 LASSERT(!peer->ibp_version &&
2456 !peer->ibp_incarnation);
2458 peer->ibp_accepting = 1;
2459 peer->ibp_version = version;
2460 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2462 /* I have a ref on ni that prevents it being shutdown */
2463 LASSERT(!net->ibn_shutdown);
2465 kiblnd_peer_addref(peer);
2466 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2468 write_unlock_irqrestore(g_lock, flags);
2471 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT,
2474 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2475 kiblnd_peer_decref(peer);
2476 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2481 * conn now "owns" cmid, so I return success from here on to ensure the
2482 * CM callback doesn't destroy cmid.
2484 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2485 conn->ibc_credits = conn->ibc_queue_depth;
2486 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2487 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2488 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2490 ackmsg = &conn->ibc_connvars->cv_msg;
2491 memset(ackmsg, 0, sizeof(*ackmsg));
2493 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2494 sizeof(ackmsg->ibm_u.connparams));
2495 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2496 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags << IBLND_FRAG_SHIFT;
2497 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2499 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2501 memset(&cp, 0, sizeof(cp));
2502 cp.private_data = ackmsg;
2503 cp.private_data_len = ackmsg->ibm_nob;
2504 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2505 cp.initiator_depth = 0;
2506 cp.flow_control = 1;
2507 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2508 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2510 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2512 rc = rdma_accept(cmid, &cp);
2514 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2515 rej.ibr_version = version;
2516 rej.ibr_why = IBLND_REJECT_FATAL;
2518 kiblnd_reject(cmid, &rej);
2519 kiblnd_connreq_done(conn, rc);
2520 kiblnd_conn_decref(conn);
2528 rej.ibr_cp.ibcp_queue_depth = kiblnd_msg_queue_size(version, ni);
2529 rej.ibr_cp.ibcp_max_frags = kiblnd_rdma_frags(version, ni);
2533 rej.ibr_version = version;
2534 kiblnd_reject(cmid, &rej);
2536 return -ECONNREFUSED;
2540 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2541 __u64 incarnation, int why, struct kib_connparams *cp)
2543 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2544 struct kib_peer *peer = conn->ibc_peer;
2546 int msg_size = IBLND_MSG_SIZE;
2550 unsigned long flags;
2552 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2553 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2554 LASSERT(!peer->ibp_reconnecting);
2557 msg_size = cp->ibcp_max_msg_size;
2558 frag_num = cp->ibcp_max_frags << IBLND_FRAG_SHIFT;
2559 queue_dep = cp->ibcp_queue_depth;
2562 write_lock_irqsave(glock, flags);
2564 * retry connection if it's still needed and no other connection
2565 * attempts (active or passive) are in progress
2566 * NB: reconnect is still needed even when ibp_tx_queue is
2567 * empty if ibp_version != version because reconnect may be
2568 * initiated by kiblnd_query()
2570 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2571 peer->ibp_version != version) &&
2572 peer->ibp_connecting == 1 &&
2573 !peer->ibp_accepting;
2584 case IBLND_REJECT_RDMA_FRAGS: {
2585 struct lnet_ioctl_config_lnd_tunables *tunables;
2588 reason = "can't negotiate max frags";
2591 tunables = peer->ibp_ni->ni_lnd_tunables;
2592 if (!tunables->lt_tun_u.lt_o2ib.lnd_map_on_demand) {
2593 reason = "map_on_demand must be enabled";
2596 if (conn->ibc_max_frags <= frag_num) {
2597 reason = "unsupported max frags";
2601 peer->ibp_max_frags = frag_num;
2602 reason = "rdma fragments";
2605 case IBLND_REJECT_MSG_QUEUE_SIZE:
2607 reason = "can't negotiate queue depth";
2610 if (conn->ibc_queue_depth <= queue_dep) {
2611 reason = "unsupported queue depth";
2615 peer->ibp_queue_depth = queue_dep;
2616 reason = "queue depth";
2619 case IBLND_REJECT_CONN_STALE:
2623 case IBLND_REJECT_CONN_RACE:
2624 reason = "conn race";
2627 case IBLND_REJECT_CONN_UNCOMPAT:
2628 reason = "version negotiation";
2632 conn->ibc_reconnect = 1;
2633 peer->ibp_reconnecting = 1;
2634 peer->ibp_version = version;
2636 peer->ibp_incarnation = incarnation;
2638 write_unlock_irqrestore(glock, flags);
2640 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2641 libcfs_nid2str(peer->ibp_nid),
2642 reconnect ? "reconnect" : "don't reconnect",
2643 reason, IBLND_MSG_VERSION, version, msg_size,
2644 conn->ibc_queue_depth, queue_dep,
2645 conn->ibc_max_frags, frag_num);
2647 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer
2648 * while destroying the zombie
2653 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2655 struct kib_peer *peer = conn->ibc_peer;
2657 LASSERT(!in_interrupt());
2658 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2661 case IB_CM_REJ_STALE_CONN:
2662 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2663 IBLND_REJECT_CONN_STALE, NULL);
2666 case IB_CM_REJ_INVALID_SERVICE_ID:
2667 CNETERR("%s rejected: no listener at %d\n",
2668 libcfs_nid2str(peer->ibp_nid),
2669 *kiblnd_tunables.kib_service);
2672 case IB_CM_REJ_CONSUMER_DEFINED:
2673 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2674 struct kib_rej *rej = priv;
2675 struct kib_connparams *cp = NULL;
2677 __u64 incarnation = -1;
2679 /* NB. default incarnation is -1 because:
2680 * a) V1 will ignore dst incarnation in connreq.
2681 * b) V2 will provide incarnation while rejecting me,
2682 * -1 will be overwrote.
2684 * if I try to connect to a V1 peer with V2 protocol,
2685 * it rejected me then upgrade to V2, I have no idea
2686 * about the upgrading and try to reconnect with V1,
2687 * in this case upgraded V2 can find out I'm trying to
2688 * talk to the old guy and reject me(incarnation is -1).
2691 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2692 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2693 __swab32s(&rej->ibr_magic);
2694 __swab16s(&rej->ibr_version);
2698 if (priv_nob >= sizeof(struct kib_rej) &&
2699 rej->ibr_version > IBLND_MSG_VERSION_1) {
2701 * priv_nob is always 148 in current version
2702 * of OFED, so we still need to check version.
2703 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE)
2708 __swab64s(&rej->ibr_incarnation);
2709 __swab16s(&cp->ibcp_queue_depth);
2710 __swab16s(&cp->ibcp_max_frags);
2711 __swab32s(&cp->ibcp_max_msg_size);
2714 incarnation = rej->ibr_incarnation;
2717 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2718 rej->ibr_magic != LNET_PROTO_MAGIC) {
2719 CERROR("%s rejected: consumer defined fatal error\n",
2720 libcfs_nid2str(peer->ibp_nid));
2724 if (rej->ibr_version != IBLND_MSG_VERSION &&
2725 rej->ibr_version != IBLND_MSG_VERSION_1) {
2726 CERROR("%s rejected: o2iblnd version %x error\n",
2727 libcfs_nid2str(peer->ibp_nid),
2732 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2733 rej->ibr_version == IBLND_MSG_VERSION_1) {
2734 CDEBUG(D_NET, "rejected by old version peer %s: %x\n",
2735 libcfs_nid2str(peer->ibp_nid), rej->ibr_version);
2737 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2738 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2741 switch (rej->ibr_why) {
2742 case IBLND_REJECT_CONN_RACE:
2743 case IBLND_REJECT_CONN_STALE:
2744 case IBLND_REJECT_CONN_UNCOMPAT:
2745 case IBLND_REJECT_MSG_QUEUE_SIZE:
2746 case IBLND_REJECT_RDMA_FRAGS:
2747 kiblnd_check_reconnect(conn, rej->ibr_version,
2752 case IBLND_REJECT_NO_RESOURCES:
2753 CERROR("%s rejected: o2iblnd no resources\n",
2754 libcfs_nid2str(peer->ibp_nid));
2757 case IBLND_REJECT_FATAL:
2758 CERROR("%s rejected: o2iblnd fatal error\n",
2759 libcfs_nid2str(peer->ibp_nid));
2763 CERROR("%s rejected: o2iblnd reason %d\n",
2764 libcfs_nid2str(peer->ibp_nid),
2772 CNETERR("%s rejected: reason %d, size %d\n",
2773 libcfs_nid2str(peer->ibp_nid), reason, priv_nob);
2777 kiblnd_connreq_done(conn, -ECONNREFUSED);
2781 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2783 struct kib_peer *peer = conn->ibc_peer;
2784 struct lnet_ni *ni = peer->ibp_ni;
2785 struct kib_net *net = ni->ni_data;
2786 struct kib_msg *msg = priv;
2787 int ver = conn->ibc_version;
2788 int rc = kiblnd_unpack_msg(msg, priv_nob);
2789 unsigned long flags;
2794 CERROR("Can't unpack connack from %s: %d\n",
2795 libcfs_nid2str(peer->ibp_nid), rc);
2799 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2800 CERROR("Unexpected message %d from %s\n",
2801 msg->ibm_type, libcfs_nid2str(peer->ibp_nid));
2806 if (ver != msg->ibm_version) {
2807 CERROR("%s replied version %x is different with requested version %x\n",
2808 libcfs_nid2str(peer->ibp_nid), msg->ibm_version, ver);
2813 if (msg->ibm_u.connparams.ibcp_queue_depth >
2814 conn->ibc_queue_depth) {
2815 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2816 libcfs_nid2str(peer->ibp_nid),
2817 msg->ibm_u.connparams.ibcp_queue_depth,
2818 conn->ibc_queue_depth);
2823 if ((msg->ibm_u.connparams.ibcp_max_frags >> IBLND_FRAG_SHIFT) >
2824 conn->ibc_max_frags) {
2825 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2826 libcfs_nid2str(peer->ibp_nid),
2827 msg->ibm_u.connparams.ibcp_max_frags >> IBLND_FRAG_SHIFT,
2828 conn->ibc_max_frags);
2833 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2834 CERROR("%s max message size %d too big (%d max)\n",
2835 libcfs_nid2str(peer->ibp_nid),
2836 msg->ibm_u.connparams.ibcp_max_msg_size,
2842 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2843 if (msg->ibm_dstnid == ni->ni_nid &&
2844 msg->ibm_dststamp == net->ibn_incarnation)
2848 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2851 CERROR("Bad connection reply from %s, rc = %d, version: %x max_frags: %d\n",
2852 libcfs_nid2str(peer->ibp_nid), rc,
2853 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2857 conn->ibc_incarnation = msg->ibm_srcstamp;
2858 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2859 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2860 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2861 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags >> IBLND_FRAG_SHIFT;
2862 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2863 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2865 kiblnd_connreq_done(conn, 0);
2870 * NB My QP has already established itself, so I handle anything going
2871 * wrong here by setting ibc_comms_error.
2872 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2873 * immediately tears it down.
2876 conn->ibc_comms_error = rc;
2877 kiblnd_connreq_done(conn, 0);
2881 kiblnd_active_connect(struct rdma_cm_id *cmid)
2883 struct kib_peer *peer = (struct kib_peer *)cmid->context;
2884 struct kib_conn *conn;
2885 struct kib_msg *msg;
2886 struct rdma_conn_param cp;
2889 unsigned long flags;
2892 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2894 incarnation = peer->ibp_incarnation;
2895 version = !peer->ibp_version ? IBLND_MSG_VERSION :
2898 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2900 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_ACTIVE_CONNECT,
2903 kiblnd_peer_connect_failed(peer, 1, -ENOMEM);
2904 kiblnd_peer_decref(peer); /* lose cmid's ref */
2909 * conn "owns" cmid now, so I return success from here on to ensure the
2910 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2913 msg = &conn->ibc_connvars->cv_msg;
2915 memset(msg, 0, sizeof(*msg));
2916 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2917 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2918 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags << IBLND_FRAG_SHIFT;
2919 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2921 kiblnd_pack_msg(peer->ibp_ni, msg, version,
2922 0, peer->ibp_nid, incarnation);
2924 memset(&cp, 0, sizeof(cp));
2925 cp.private_data = msg;
2926 cp.private_data_len = msg->ibm_nob;
2927 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2928 cp.initiator_depth = 0;
2929 cp.flow_control = 1;
2930 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2931 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2933 LASSERT(cmid->context == (void *)conn);
2934 LASSERT(conn->ibc_cmid == cmid);
2936 rc = rdma_connect(cmid, &cp);
2938 CERROR("Can't connect to %s: %d\n",
2939 libcfs_nid2str(peer->ibp_nid), rc);
2940 kiblnd_connreq_done(conn, rc);
2941 kiblnd_conn_decref(conn);
2948 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2950 struct kib_peer *peer;
2951 struct kib_conn *conn;
2954 switch (event->event) {
2956 CERROR("Unexpected event: %d, status: %d\n",
2957 event->event, event->status);
2960 case RDMA_CM_EVENT_CONNECT_REQUEST:
2961 /* destroy cmid on failure */
2962 rc = kiblnd_passive_connect(cmid,
2963 (void *)KIBLND_CONN_PARAM(event),
2964 KIBLND_CONN_PARAM_LEN(event));
2965 CDEBUG(D_NET, "connreq: %d\n", rc);
2968 case RDMA_CM_EVENT_ADDR_ERROR:
2969 peer = (struct kib_peer *)cmid->context;
2970 CNETERR("%s: ADDR ERROR %d\n",
2971 libcfs_nid2str(peer->ibp_nid), event->status);
2972 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
2973 kiblnd_peer_decref(peer);
2974 return -EHOSTUNREACH; /* rc destroys cmid */
2976 case RDMA_CM_EVENT_ADDR_RESOLVED:
2977 peer = (struct kib_peer *)cmid->context;
2979 CDEBUG(D_NET, "%s Addr resolved: %d\n",
2980 libcfs_nid2str(peer->ibp_nid), event->status);
2982 if (event->status) {
2983 CNETERR("Can't resolve address for %s: %d\n",
2984 libcfs_nid2str(peer->ibp_nid), event->status);
2987 rc = rdma_resolve_route(
2988 cmid, *kiblnd_tunables.kib_timeout * 1000);
2990 struct kib_net *net = peer->ibp_ni->ni_data;
2991 struct kib_dev *dev = net->ibn_dev;
2993 CDEBUG(D_NET, "%s: connection bound to "\
2995 libcfs_nid2str(peer->ibp_nid),
2997 &dev->ibd_ifip, cmid->device->name);
3002 /* Can't initiate route resolution */
3003 CERROR("Can't resolve route for %s: %d\n",
3004 libcfs_nid2str(peer->ibp_nid), rc);
3006 kiblnd_peer_connect_failed(peer, 1, rc);
3007 kiblnd_peer_decref(peer);
3008 return rc; /* rc destroys cmid */
3010 case RDMA_CM_EVENT_ROUTE_ERROR:
3011 peer = (struct kib_peer *)cmid->context;
3012 CNETERR("%s: ROUTE ERROR %d\n",
3013 libcfs_nid2str(peer->ibp_nid), event->status);
3014 kiblnd_peer_connect_failed(peer, 1, -EHOSTUNREACH);
3015 kiblnd_peer_decref(peer);
3016 return -EHOSTUNREACH; /* rc destroys cmid */
3018 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3019 peer = (struct kib_peer *)cmid->context;
3020 CDEBUG(D_NET, "%s Route resolved: %d\n",
3021 libcfs_nid2str(peer->ibp_nid), event->status);
3024 return kiblnd_active_connect(cmid);
3026 CNETERR("Can't resolve route for %s: %d\n",
3027 libcfs_nid2str(peer->ibp_nid), event->status);
3028 kiblnd_peer_connect_failed(peer, 1, event->status);
3029 kiblnd_peer_decref(peer);
3030 return event->status; /* rc destroys cmid */
3032 case RDMA_CM_EVENT_UNREACHABLE:
3033 conn = (struct kib_conn *)cmid->context;
3034 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3035 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3036 CNETERR("%s: UNREACHABLE %d\n",
3037 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3038 kiblnd_connreq_done(conn, -ENETDOWN);
3039 kiblnd_conn_decref(conn);
3042 case RDMA_CM_EVENT_CONNECT_ERROR:
3043 conn = (struct kib_conn *)cmid->context;
3044 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3045 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3046 CNETERR("%s: CONNECT ERROR %d\n",
3047 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3048 kiblnd_connreq_done(conn, -ENOTCONN);
3049 kiblnd_conn_decref(conn);
3052 case RDMA_CM_EVENT_REJECTED:
3053 conn = (struct kib_conn *)cmid->context;
3054 switch (conn->ibc_state) {
3058 case IBLND_CONN_PASSIVE_WAIT:
3059 CERROR("%s: REJECTED %d\n",
3060 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3062 kiblnd_connreq_done(conn, -ECONNRESET);
3065 case IBLND_CONN_ACTIVE_CONNECT:
3066 kiblnd_rejected(conn, event->status,
3067 (void *)KIBLND_CONN_PARAM(event),
3068 KIBLND_CONN_PARAM_LEN(event));
3071 kiblnd_conn_decref(conn);
3074 case RDMA_CM_EVENT_ESTABLISHED:
3075 conn = (struct kib_conn *)cmid->context;
3076 switch (conn->ibc_state) {
3080 case IBLND_CONN_PASSIVE_WAIT:
3081 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3082 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3083 kiblnd_connreq_done(conn, 0);
3086 case IBLND_CONN_ACTIVE_CONNECT:
3087 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3088 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3089 kiblnd_check_connreply(conn,
3090 (void *)KIBLND_CONN_PARAM(event),
3091 KIBLND_CONN_PARAM_LEN(event));
3094 /* net keeps its ref on conn! */
3097 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3098 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3100 case RDMA_CM_EVENT_DISCONNECTED:
3101 conn = (struct kib_conn *)cmid->context;
3102 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3103 CERROR("%s DISCONNECTED\n",
3104 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3105 kiblnd_connreq_done(conn, -ECONNRESET);
3107 kiblnd_close_conn(conn, 0);
3109 kiblnd_conn_decref(conn);
3110 cmid->context = NULL;
3113 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3114 LCONSOLE_ERROR_MSG(0x131,
3115 "Received notification of device removal\n"
3116 "Please shutdown LNET to allow this to proceed\n");
3118 * Can't remove network from underneath LNET for now, so I have
3123 case RDMA_CM_EVENT_ADDR_CHANGE:
3124 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3130 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3133 struct list_head *ttmp;
3135 list_for_each(ttmp, txs) {
3136 tx = list_entry(ttmp, struct kib_tx, tx_list);
3138 if (txs != &conn->ibc_active_txs) {
3139 LASSERT(tx->tx_queued);
3141 LASSERT(!tx->tx_queued);
3142 LASSERT(tx->tx_waiting || tx->tx_sending);
3145 if (cfs_time_aftereq(jiffies, tx->tx_deadline)) {
3146 CERROR("Timed out tx: %s, %lu seconds\n",
3147 kiblnd_queue2str(conn, txs),
3148 cfs_duration_sec(jiffies - tx->tx_deadline));
3157 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3159 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3160 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3161 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3162 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3163 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3167 kiblnd_check_conns(int idx)
3170 LIST_HEAD(checksends);
3171 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3172 struct list_head *ptmp;
3173 struct kib_peer *peer;
3174 struct kib_conn *conn;
3175 struct kib_conn *temp;
3176 struct kib_conn *tmp;
3177 struct list_head *ctmp;
3178 unsigned long flags;
3181 * NB. We expect to have a look at all the peers and not find any
3182 * RDMAs to time out, so we just use a shared lock while we
3185 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3187 list_for_each(ptmp, peers) {
3188 peer = list_entry(ptmp, struct kib_peer, ibp_list);
3190 list_for_each(ctmp, &peer->ibp_conns) {
3194 conn = list_entry(ctmp, struct kib_conn, ibc_list);
3196 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3198 spin_lock(&conn->ibc_lock);
3200 sendnoop = kiblnd_need_noop(conn);
3201 timedout = kiblnd_conn_timed_out_locked(conn);
3202 if (!sendnoop && !timedout) {
3203 spin_unlock(&conn->ibc_lock);
3208 CERROR("Timed out RDMA with %s (%lu): c: %u, oc: %u, rc: %u\n",
3209 libcfs_nid2str(peer->ibp_nid),
3210 cfs_duration_sec(cfs_time_current() -
3211 peer->ibp_last_alive),
3213 conn->ibc_outstanding_credits,
3214 conn->ibc_reserved_credits);
3215 list_add(&conn->ibc_connd_list, &closes);
3217 list_add(&conn->ibc_connd_list, &checksends);
3219 /* +ref for 'closes' or 'checksends' */
3220 kiblnd_conn_addref(conn);
3222 spin_unlock(&conn->ibc_lock);
3226 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3229 * Handle timeout by closing the whole
3230 * connection. We can only be sure RDMA activity
3231 * has ceased once the QP has been modified.
3233 list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
3234 list_del(&conn->ibc_connd_list);
3235 kiblnd_close_conn(conn, -ETIMEDOUT);
3236 kiblnd_conn_decref(conn);
3240 * In case we have enough credits to return via a
3241 * NOOP, but there were no non-blocking tx descs
3242 * free to do it last time...
3244 list_for_each_entry_safe(conn, temp, &checksends, ibc_connd_list) {
3245 list_del(&conn->ibc_connd_list);
3247 spin_lock(&conn->ibc_lock);
3248 kiblnd_check_sends_locked(conn);
3249 spin_unlock(&conn->ibc_lock);
3251 kiblnd_conn_decref(conn);
3256 kiblnd_disconnect_conn(struct kib_conn *conn)
3258 LASSERT(!in_interrupt());
3259 LASSERT(current == kiblnd_data.kib_connd);
3260 LASSERT(conn->ibc_state == IBLND_CONN_CLOSING);
3262 rdma_disconnect(conn->ibc_cmid);
3263 kiblnd_finalise_conn(conn);
3265 kiblnd_peer_notify(conn->ibc_peer);
3269 * High-water for reconnection to the same peer, reconnection attempt should
3270 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3272 #define KIB_RECONN_HIGH_RACE 10
3274 * Allow connd to take a break and handle other things after consecutive
3275 * reconnection attempts.
3277 #define KIB_RECONN_BREAK 100
3280 kiblnd_connd(void *arg)
3282 spinlock_t *lock = &kiblnd_data.kib_connd_lock;
3283 wait_queue_entry_t wait;
3284 unsigned long flags;
3285 struct kib_conn *conn;
3290 unsigned long deadline = jiffies;
3292 cfs_block_allsigs();
3294 init_waitqueue_entry(&wait, current);
3295 kiblnd_data.kib_connd = current;
3297 spin_lock_irqsave(lock, flags);
3299 while (!kiblnd_data.kib_shutdown) {
3304 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3305 struct kib_peer *peer = NULL;
3307 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3308 struct kib_conn, ibc_list);
3309 list_del(&conn->ibc_list);
3310 if (conn->ibc_reconnect) {
3311 peer = conn->ibc_peer;
3312 kiblnd_peer_addref(peer);
3315 spin_unlock_irqrestore(lock, flags);
3318 kiblnd_destroy_conn(conn);
3320 spin_lock_irqsave(lock, flags);
3326 conn->ibc_peer = peer;
3327 if (peer->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3328 list_add_tail(&conn->ibc_list,
3329 &kiblnd_data.kib_reconn_list);
3331 list_add_tail(&conn->ibc_list,
3332 &kiblnd_data.kib_reconn_wait);
3335 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3336 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3337 struct kib_conn, ibc_list);
3338 list_del(&conn->ibc_list);
3340 spin_unlock_irqrestore(lock, flags);
3343 kiblnd_disconnect_conn(conn);
3344 kiblnd_conn_decref(conn);
3346 spin_lock_irqsave(lock, flags);
3349 while (reconn < KIB_RECONN_BREAK) {
3350 if (kiblnd_data.kib_reconn_sec !=
3351 ktime_get_real_seconds()) {
3352 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3353 list_splice_init(&kiblnd_data.kib_reconn_wait,
3354 &kiblnd_data.kib_reconn_list);
3357 if (list_empty(&kiblnd_data.kib_reconn_list))
3360 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3361 struct kib_conn, ibc_list);
3362 list_del(&conn->ibc_list);
3364 spin_unlock_irqrestore(lock, flags);
3367 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3368 kiblnd_peer_decref(conn->ibc_peer);
3369 LIBCFS_FREE(conn, sizeof(*conn));
3371 spin_lock_irqsave(lock, flags);
3374 /* careful with the jiffy wrap... */
3375 timeout = (int)(deadline - jiffies);
3379 int chunk = kiblnd_data.kib_peer_hash_size;
3381 spin_unlock_irqrestore(lock, flags);
3385 * Time to check for RDMA timeouts on a few more
3386 * peers: I do checks every 'p' seconds on a
3387 * proportion of the peer table and I need to check
3388 * every connection 'n' times within a timeout
3389 * interval, to ensure I detect a timeout on any
3390 * connection within (n+1)/n times the timeout
3393 if (*kiblnd_tunables.kib_timeout > n * p)
3394 chunk = (chunk * n * p) /
3395 *kiblnd_tunables.kib_timeout;
3399 for (i = 0; i < chunk; i++) {
3400 kiblnd_check_conns(peer_index);
3401 peer_index = (peer_index + 1) %
3402 kiblnd_data.kib_peer_hash_size;
3405 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3406 spin_lock_irqsave(lock, flags);
3412 /* Nothing to do for 'timeout' */
3413 set_current_state(TASK_INTERRUPTIBLE);
3414 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3415 spin_unlock_irqrestore(lock, flags);
3417 schedule_timeout(timeout);
3419 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3420 spin_lock_irqsave(lock, flags);
3423 spin_unlock_irqrestore(lock, flags);
3425 kiblnd_thread_fini();
3430 kiblnd_qp_event(struct ib_event *event, void *arg)
3432 struct kib_conn *conn = arg;
3434 switch (event->event) {
3435 case IB_EVENT_COMM_EST:
3436 CDEBUG(D_NET, "%s established\n",
3437 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3439 * We received a packet but connection isn't established
3440 * probably handshake packet was lost, so free to
3441 * force make connection established
3443 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3447 CERROR("%s: Async QP event type %d\n",
3448 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3454 kiblnd_complete(struct ib_wc *wc)
3456 switch (kiblnd_wreqid2type(wc->wr_id)) {
3461 if (wc->status != IB_WC_SUCCESS &&
3462 wc->status != IB_WC_WR_FLUSH_ERR)
3463 CNETERR("FastReg failed: %d\n", wc->status);
3466 case IBLND_WID_RDMA:
3468 * We only get RDMA completion notification if it fails. All
3469 * subsequent work items, including the final SEND will fail
3470 * too. However we can't print out any more info about the
3471 * failing RDMA because 'tx' might be back on the idle list or
3472 * even reused already if we didn't manage to post all our work
3475 CNETERR("RDMA (tx: %p) failed: %d\n",
3476 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3480 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3484 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3491 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3494 * NB I'm not allowed to schedule this conn once its refcount has
3495 * reached 0. Since fundamentally I'm racing with scheduler threads
3496 * consuming my CQ I could be called after all completions have
3497 * occurred. But in this case, !ibc_nrx && !ibc_nsends_posted
3498 * and this CQ is about to be destroyed so I NOOP.
3500 struct kib_conn *conn = arg;
3501 struct kib_sched_info *sched = conn->ibc_sched;
3502 unsigned long flags;
3504 LASSERT(cq == conn->ibc_cq);
3506 spin_lock_irqsave(&sched->ibs_lock, flags);
3508 conn->ibc_ready = 1;
3510 if (!conn->ibc_scheduled &&
3511 (conn->ibc_nrx > 0 ||
3512 conn->ibc_nsends_posted > 0)) {
3513 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3514 conn->ibc_scheduled = 1;
3515 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3517 if (waitqueue_active(&sched->ibs_waitq))
3518 wake_up(&sched->ibs_waitq);
3521 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3525 kiblnd_cq_event(struct ib_event *event, void *arg)
3527 struct kib_conn *conn = arg;
3529 CERROR("%s: async CQ event type %d\n",
3530 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3534 kiblnd_scheduler(void *arg)
3536 long id = (long)arg;
3537 struct kib_sched_info *sched;
3538 struct kib_conn *conn;
3539 wait_queue_entry_t wait;
3540 unsigned long flags;
3546 cfs_block_allsigs();
3548 init_waitqueue_entry(&wait, current);
3550 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3552 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3554 CWARN("Unable to bind on CPU partition %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n",
3558 spin_lock_irqsave(&sched->ibs_lock, flags);
3560 while (!kiblnd_data.kib_shutdown) {
3561 if (busy_loops++ >= IBLND_RESCHED) {
3562 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3567 spin_lock_irqsave(&sched->ibs_lock, flags);
3572 if (!list_empty(&sched->ibs_conns)) {
3573 conn = list_entry(sched->ibs_conns.next, struct kib_conn,
3575 /* take over kib_sched_conns' ref on conn... */
3576 LASSERT(conn->ibc_scheduled);
3577 list_del(&conn->ibc_sched_list);
3578 conn->ibc_ready = 0;
3580 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3582 wc.wr_id = IBLND_WID_INVAL;
3584 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3586 rc = ib_req_notify_cq(conn->ibc_cq,
3589 CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
3590 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3591 kiblnd_close_conn(conn, -EIO);
3592 kiblnd_conn_decref(conn);
3593 spin_lock_irqsave(&sched->ibs_lock,
3598 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3601 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3602 LCONSOLE_ERROR("ib_poll_cq (rc: %d) returned invalid wr_id, opcode %d, status: %d, vendor_err: %d, conn: %s status: %d\nplease upgrade firmware and OFED or contact vendor.\n",
3603 rc, wc.opcode, wc.status,
3605 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3611 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
3612 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3614 kiblnd_close_conn(conn, -EIO);
3615 kiblnd_conn_decref(conn);
3616 spin_lock_irqsave(&sched->ibs_lock, flags);
3620 spin_lock_irqsave(&sched->ibs_lock, flags);
3622 if (rc || conn->ibc_ready) {
3624 * There may be another completion waiting; get
3625 * another scheduler to check while I handle
3628 /* +1 ref for sched_conns */
3629 kiblnd_conn_addref(conn);
3630 list_add_tail(&conn->ibc_sched_list,
3632 if (waitqueue_active(&sched->ibs_waitq))
3633 wake_up(&sched->ibs_waitq);
3635 conn->ibc_scheduled = 0;
3639 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3640 kiblnd_complete(&wc);
3642 spin_lock_irqsave(&sched->ibs_lock, flags);
3645 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3652 set_current_state(TASK_INTERRUPTIBLE);
3653 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3654 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3659 remove_wait_queue(&sched->ibs_waitq, &wait);
3660 spin_lock_irqsave(&sched->ibs_lock, flags);
3663 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3665 kiblnd_thread_fini();
3670 kiblnd_failover_thread(void *arg)
3672 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3673 struct kib_dev *dev;
3674 wait_queue_entry_t wait;
3675 unsigned long flags;
3678 LASSERT(*kiblnd_tunables.kib_dev_failover);
3680 cfs_block_allsigs();
3682 init_waitqueue_entry(&wait, current);
3683 write_lock_irqsave(glock, flags);
3685 while (!kiblnd_data.kib_shutdown) {
3686 int do_failover = 0;
3689 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3691 if (time_before(cfs_time_current(),
3692 dev->ibd_next_failover))
3699 list_del_init(&dev->ibd_fail_list);
3700 dev->ibd_failover = 1;
3701 write_unlock_irqrestore(glock, flags);
3703 rc = kiblnd_dev_failover(dev);
3705 write_lock_irqsave(glock, flags);
3707 LASSERT(dev->ibd_failover);
3708 dev->ibd_failover = 0;
3709 if (rc >= 0) { /* Device is OK or failover succeed */
3710 dev->ibd_next_failover = cfs_time_shift(3);
3714 /* failed to failover, retry later */
3715 dev->ibd_next_failover =
3716 cfs_time_shift(min(dev->ibd_failed_failover, 10));
3717 if (kiblnd_dev_can_failover(dev)) {
3718 list_add_tail(&dev->ibd_fail_list,
3719 &kiblnd_data.kib_failed_devs);
3725 /* long sleep if no more pending failover */
3726 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3728 set_current_state(TASK_INTERRUPTIBLE);
3729 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3730 write_unlock_irqrestore(glock, flags);
3732 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3733 cfs_time_seconds(1));
3734 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3735 write_lock_irqsave(glock, flags);
3737 if (!long_sleep || rc)
3741 * have a long sleep, routine check all active devices,
3742 * we need checking like this because if there is not active
3743 * connection on the dev and no SEND from local, we may listen
3744 * on wrong HCA for ever while there is a bonding failover
3746 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3747 if (kiblnd_dev_can_failover(dev)) {
3748 list_add_tail(&dev->ibd_fail_list,
3749 &kiblnd_data.kib_failed_devs);
3754 write_unlock_irqrestore(glock, flags);
3756 kiblnd_thread_fini();