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 kib_fmr_poolset_t *fps;
572 LASSERT(tx->tx_pool != NULL);
573 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
575 hdev = tx->tx_pool->tpo_hdev;
576 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
578 fps = net->ibn_fmr_ps[cpt];
579 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->fmr);
581 CERROR("Can't map %u pages: %d\n", nob, rc);
585 /* If rd is not tx_rd, it's going to get sent to a peer, who will need
587 rd->rd_key = tx->fmr.fmr_key;
588 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
589 rd->rd_frags[0].rf_nob = nob;
596 kiblnd_unmap_tx(lnet_ni_t *ni, kib_tx_t *tx)
598 kib_net_t *net = ni->ni_data;
600 LASSERT(net != NULL);
602 if (net->ibn_fmr_ps != NULL)
603 kiblnd_fmr_pool_unmap(&tx->fmr, tx->tx_status);
605 if (tx->tx_nfrags != 0) {
606 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
607 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
613 kiblnd_map_tx(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
615 kib_net_t *net = ni->ni_data;
616 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
617 struct ib_mr *mr = NULL;
621 /* If rd is not tx_rd, it's going to get sent to a peer and I'm the
623 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
624 tx->tx_nfrags = nfrags;
626 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
627 tx->tx_nfrags, tx->tx_dmadir);
629 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
630 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
631 hdev->ibh_ibdev, &tx->tx_frags[i]);
632 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
633 hdev->ibh_ibdev, &tx->tx_frags[i]);
634 nob += rd->rd_frags[i].rf_nob;
637 mr = kiblnd_find_rd_dma_mr(ni, rd,
638 (tx->tx_conn != NULL) ?
639 tx->tx_conn->ibc_max_frags : -1);
641 /* found pre-mapping MR */
642 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
646 if (net->ibn_fmr_ps != NULL)
647 return kiblnd_fmr_map_tx(net, tx, rd, nob);
654 kiblnd_setup_rd_iov(lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
655 unsigned int niov, struct kvec *iov, int offset, int nob)
657 kib_net_t *net = ni->ni_data;
659 struct scatterlist *sg;
666 LASSERT (net != NULL);
668 while (offset >= iov->iov_len) {
669 offset -= iov->iov_len;
679 vaddr = ((unsigned long)iov->iov_base) + offset;
680 page_offset = vaddr & (PAGE_SIZE - 1);
681 page = kiblnd_kvaddr_to_page(vaddr);
683 CERROR ("Can't find page\n");
687 fragnob = min((int)(iov->iov_len - offset), nob);
688 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
690 sg_set_page(sg, page, fragnob, page_offset);
693 if (offset + fragnob < iov->iov_len) {
703 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
707 kiblnd_setup_rd_kiov (lnet_ni_t *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
708 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
710 kib_net_t *net = ni->ni_data;
711 struct scatterlist *sg;
714 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
718 LASSERT (net != NULL);
720 while (offset >= kiov->kiov_len) {
721 offset -= kiov->kiov_len;
731 fragnob = min((int)(kiov->kiov_len - offset), nob);
733 sg_set_page(sg, kiov->kiov_page, fragnob,
734 kiov->kiov_offset + offset);
743 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
747 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
748 __must_hold(&conn->ibc_lock)
750 kib_msg_t *msg = tx->tx_msg;
751 kib_peer_t *peer = conn->ibc_peer;
752 struct lnet_ni *ni = peer->ibp_ni;
753 int ver = conn->ibc_version;
757 LASSERT(tx->tx_queued);
758 /* We rely on this for QP sizing */
759 LASSERT(tx->tx_nwrq > 0);
760 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
762 LASSERT(credit == 0 || credit == 1);
763 LASSERT(conn->ibc_outstanding_credits >= 0);
764 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
765 LASSERT(conn->ibc_credits >= 0);
766 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
768 if (conn->ibc_nsends_posted ==
769 kiblnd_concurrent_sends(ver, ni)) {
770 /* tx completions outstanding... */
771 CDEBUG(D_NET, "%s: posted enough\n",
772 libcfs_nid2str(peer->ibp_nid));
776 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
777 CDEBUG(D_NET, "%s: no credits\n",
778 libcfs_nid2str(peer->ibp_nid));
782 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
783 conn->ibc_credits == 1 && /* last credit reserved */
784 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
785 CDEBUG(D_NET, "%s: not using last credit\n",
786 libcfs_nid2str(peer->ibp_nid));
790 /* NB don't drop ibc_lock before bumping tx_sending */
791 list_del(&tx->tx_list);
794 if (msg->ibm_type == IBLND_MSG_NOOP &&
795 (!kiblnd_need_noop(conn) || /* redundant NOOP */
796 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
797 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
798 /* OK to drop when posted enough NOOPs, since
799 * kiblnd_check_sends will queue NOOP again when
800 * posted NOOPs complete */
801 spin_unlock(&conn->ibc_lock);
802 kiblnd_tx_done(peer->ibp_ni, tx);
803 spin_lock(&conn->ibc_lock);
804 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
805 libcfs_nid2str(peer->ibp_nid),
806 conn->ibc_noops_posted);
810 kiblnd_pack_msg(peer->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
811 peer->ibp_nid, conn->ibc_incarnation);
813 conn->ibc_credits -= credit;
814 conn->ibc_outstanding_credits = 0;
815 conn->ibc_nsends_posted++;
816 if (msg->ibm_type == IBLND_MSG_NOOP)
817 conn->ibc_noops_posted++;
819 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
820 * PUT. If so, it was first queued here as a PUT_REQ, sent and
821 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
822 * and then re-queued here. It's (just) possible that
823 * tx_sending is non-zero if we've not done the tx_complete()
824 * from the first send; hence the ++ rather than = below. */
826 list_add(&tx->tx_list, &conn->ibc_active_txs);
828 /* I'm still holding ibc_lock! */
829 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
831 } else if (tx->tx_pool->tpo_pool.po_failed ||
832 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
833 /* close_conn will launch failover */
836 struct kib_fast_reg_descriptor *frd = tx->fmr.fmr_frd;
837 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
838 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
841 if (!frd->frd_valid) {
842 wr = &frd->frd_inv_wr.wr;
843 wr->next = &frd->frd_fastreg_wr.wr;
845 wr = &frd->frd_fastreg_wr.wr;
847 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
850 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
851 "bad wr_id "LPX64", opc %d, flags %d, peer: %s\n",
852 bad->wr_id, bad->opcode, bad->send_flags,
853 libcfs_nid2str(conn->ibc_peer->ibp_nid));
856 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
859 conn->ibc_last_send = jiffies;
864 /* NB credits are transferred in the actual
865 * message, which can only be the last work item */
866 conn->ibc_credits += credit;
867 conn->ibc_outstanding_credits += msg->ibm_credits;
868 conn->ibc_nsends_posted--;
869 if (msg->ibm_type == IBLND_MSG_NOOP)
870 conn->ibc_noops_posted--;
876 done = (tx->tx_sending == 0);
878 list_del(&tx->tx_list);
880 spin_unlock(&conn->ibc_lock);
882 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
883 CERROR("Error %d posting transmit to %s\n",
884 rc, libcfs_nid2str(peer->ibp_nid));
886 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
887 rc, libcfs_nid2str(peer->ibp_nid));
889 kiblnd_close_conn(conn, rc);
892 kiblnd_tx_done(peer->ibp_ni, tx);
894 spin_lock(&conn->ibc_lock);
900 kiblnd_check_sends (kib_conn_t *conn)
902 int ver = conn->ibc_version;
903 lnet_ni_t *ni = conn->ibc_peer->ibp_ni;
906 /* Don't send anything until after the connection is established */
907 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
908 CDEBUG(D_NET, "%s too soon\n",
909 libcfs_nid2str(conn->ibc_peer->ibp_nid));
913 spin_lock(&conn->ibc_lock);
915 LASSERT(conn->ibc_nsends_posted <=
916 kiblnd_concurrent_sends(ver, ni));
917 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
918 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
919 LASSERT (conn->ibc_reserved_credits >= 0);
921 while (conn->ibc_reserved_credits > 0 &&
922 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
923 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
925 list_del(&tx->tx_list);
926 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
927 conn->ibc_reserved_credits--;
930 if (kiblnd_need_noop(conn)) {
931 spin_unlock(&conn->ibc_lock);
933 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
935 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
937 spin_lock(&conn->ibc_lock);
939 kiblnd_queue_tx_locked(tx, conn);
945 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
947 tx = list_entry(conn->ibc_tx_queue_nocred.next,
949 } else if (!list_empty(&conn->ibc_tx_noops)) {
950 LASSERT (!IBLND_OOB_CAPABLE(ver));
952 tx = list_entry(conn->ibc_tx_noops.next,
954 } else if (!list_empty(&conn->ibc_tx_queue)) {
956 tx = list_entry(conn->ibc_tx_queue.next,
961 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
965 spin_unlock(&conn->ibc_lock);
969 kiblnd_tx_complete (kib_tx_t *tx, int status)
971 int failed = (status != IB_WC_SUCCESS);
972 kib_conn_t *conn = tx->tx_conn;
975 LASSERT (tx->tx_sending > 0);
978 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
979 CNETERR("Tx -> %s cookie "LPX64
980 " sending %d waiting %d: failed %d\n",
981 libcfs_nid2str(conn->ibc_peer->ibp_nid),
982 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
985 kiblnd_close_conn(conn, -EIO);
987 kiblnd_peer_alive(conn->ibc_peer);
990 spin_lock(&conn->ibc_lock);
992 /* I could be racing with rdma completion. Whoever makes 'tx' idle
993 * gets to free it, which also drops its ref on 'conn'. */
996 conn->ibc_nsends_posted--;
997 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
998 conn->ibc_noops_posted--;
1001 tx->tx_waiting = 0; /* don't wait for peer */
1002 tx->tx_status = -EIO;
1005 idle = (tx->tx_sending == 0) && /* This is the final callback */
1006 !tx->tx_waiting && /* Not waiting for peer */
1007 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1009 list_del(&tx->tx_list);
1011 kiblnd_conn_addref(conn); /* 1 ref for me.... */
1013 spin_unlock(&conn->ibc_lock);
1016 kiblnd_tx_done(conn->ibc_peer->ibp_ni, tx);
1018 kiblnd_check_sends(conn);
1020 kiblnd_conn_decref(conn); /* ...until here */
1024 kiblnd_init_tx_msg (lnet_ni_t *ni, kib_tx_t *tx, int type, int body_nob)
1026 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1027 struct ib_sge *sge = &tx->tx_sge[tx->tx_nwrq];
1028 struct ib_rdma_wr *wrq;
1029 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1030 struct ib_mr *mr = hdev->ibh_mrs;
1032 LASSERT(tx->tx_nwrq >= 0);
1033 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1034 LASSERT(nob <= IBLND_MSG_SIZE);
1035 LASSERT(mr != NULL);
1037 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1039 sge->lkey = mr->lkey;
1040 sge->addr = tx->tx_msgaddr;
1043 wrq = &tx->tx_wrq[tx->tx_nwrq];
1044 memset(wrq, 0, sizeof(*wrq));
1046 wrq->wr.next = NULL;
1047 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1048 wrq->wr.sg_list = sge;
1049 wrq->wr.num_sge = 1;
1050 wrq->wr.opcode = IB_WR_SEND;
1051 wrq->wr.send_flags = IB_SEND_SIGNALED;
1057 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1058 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1060 kib_msg_t *ibmsg = tx->tx_msg;
1061 kib_rdma_desc_t *srcrd = tx->tx_rd;
1062 struct ib_sge *sge = &tx->tx_sge[0];
1063 struct ib_rdma_wr *wrq;
1069 LASSERT (!in_interrupt());
1070 LASSERT (tx->tx_nwrq == 0);
1071 LASSERT (type == IBLND_MSG_GET_DONE ||
1072 type == IBLND_MSG_PUT_DONE);
1074 srcidx = dstidx = 0;
1077 if (srcidx >= srcrd->rd_nfrags) {
1078 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1083 if (dstidx == dstrd->rd_nfrags) {
1084 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1089 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1090 CERROR("RDMA has too many fragments for peer %s (%d), "
1091 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1092 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1093 conn->ibc_max_frags,
1094 srcidx, srcrd->rd_nfrags,
1095 dstidx, dstrd->rd_nfrags);
1100 wrknob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1101 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1103 sge = &tx->tx_sge[tx->tx_nwrq];
1104 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1105 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1106 sge->length = wrknob;
1108 wrq = &tx->tx_wrq[tx->tx_nwrq];
1110 wrq->wr.next = &(wrq + 1)->wr;
1111 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1112 wrq->wr.sg_list = sge;
1113 wrq->wr.num_sge = 1;
1114 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1115 wrq->wr.send_flags = 0;
1117 #ifdef HAVE_IB_RDMA_WR
1118 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1119 wrq->rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1121 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd, dstidx);
1122 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd, dstidx);
1125 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, wrknob);
1126 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, wrknob);
1135 if (rc < 0) /* no RDMA if completing with failure */
1138 ibmsg->ibm_u.completion.ibcm_status = rc;
1139 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1140 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1141 type, sizeof (kib_completion_msg_t));
1147 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1149 struct list_head *q;
1151 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1152 LASSERT(!tx->tx_queued); /* not queued for sending already */
1153 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1156 tx->tx_deadline = jiffies +
1157 msecs_to_jiffies(*kiblnd_tunables.kib_timeout *
1160 if (tx->tx_conn == NULL) {
1161 kiblnd_conn_addref(conn);
1163 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1165 /* PUT_DONE first attached to conn as a PUT_REQ */
1166 LASSERT (tx->tx_conn == conn);
1167 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1170 switch (tx->tx_msg->ibm_type) {
1174 case IBLND_MSG_PUT_REQ:
1175 case IBLND_MSG_GET_REQ:
1176 q = &conn->ibc_tx_queue_rsrvd;
1179 case IBLND_MSG_PUT_NAK:
1180 case IBLND_MSG_PUT_ACK:
1181 case IBLND_MSG_PUT_DONE:
1182 case IBLND_MSG_GET_DONE:
1183 q = &conn->ibc_tx_queue_nocred;
1186 case IBLND_MSG_NOOP:
1187 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1188 q = &conn->ibc_tx_queue_nocred;
1190 q = &conn->ibc_tx_noops;
1193 case IBLND_MSG_IMMEDIATE:
1194 q = &conn->ibc_tx_queue;
1198 list_add_tail(&tx->tx_list, q);
1202 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1204 spin_lock(&conn->ibc_lock);
1205 kiblnd_queue_tx_locked(tx, conn);
1206 spin_unlock(&conn->ibc_lock);
1208 kiblnd_check_sends(conn);
1211 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1212 struct sockaddr_in *srcaddr,
1213 struct sockaddr_in *dstaddr,
1216 unsigned short port;
1219 /* allow the port to be reused */
1220 rc = rdma_set_reuseaddr(cmid, 1);
1222 CERROR("Unable to set reuse on cmid: %d\n", rc);
1226 /* look for a free privileged port */
1227 for (port = PROT_SOCK-1; port > 0; port--) {
1228 srcaddr->sin_port = htons(port);
1229 rc = rdma_resolve_addr(cmid,
1230 (struct sockaddr *)srcaddr,
1231 (struct sockaddr *)dstaddr,
1234 CDEBUG(D_NET, "bound to port %hu\n", port);
1236 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1237 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1244 CERROR("Failed to bind to a free privileged port\n");
1249 kiblnd_connect_peer (kib_peer_t *peer)
1251 struct rdma_cm_id *cmid;
1253 kib_net_t *net = peer->ibp_ni->ni_data;
1254 struct sockaddr_in srcaddr;
1255 struct sockaddr_in dstaddr;
1258 LASSERT (net != NULL);
1259 LASSERT (peer->ibp_connecting > 0);
1260 LASSERT(!peer->ibp_reconnecting);
1262 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer, RDMA_PS_TCP,
1266 CERROR("Can't create CMID for %s: %ld\n",
1267 libcfs_nid2str(peer->ibp_nid), PTR_ERR(cmid));
1273 memset(&srcaddr, 0, sizeof(srcaddr));
1274 srcaddr.sin_family = AF_INET;
1275 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1277 memset(&dstaddr, 0, sizeof(dstaddr));
1278 dstaddr.sin_family = AF_INET;
1279 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1280 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer->ibp_nid));
1282 kiblnd_peer_addref(peer); /* cmid's ref */
1284 if (*kiblnd_tunables.kib_use_priv_port) {
1285 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1286 *kiblnd_tunables.kib_timeout * 1000);
1288 rc = rdma_resolve_addr(cmid,
1289 (struct sockaddr *)&srcaddr,
1290 (struct sockaddr *)&dstaddr,
1291 *kiblnd_tunables.kib_timeout * 1000);
1294 /* Can't initiate address resolution: */
1295 CERROR("Can't resolve addr for %s: %d\n",
1296 libcfs_nid2str(peer->ibp_nid), rc);
1300 LASSERT (cmid->device != NULL);
1301 CDEBUG(D_NET, "%s: connection bound to %s:%pI4h:%s\n",
1302 libcfs_nid2str(peer->ibp_nid), dev->ibd_ifname,
1303 &dev->ibd_ifip, cmid->device->name);
1308 kiblnd_peer_connect_failed(peer, 1, rc);
1309 kiblnd_peer_decref(peer); /* cmid's ref */
1310 rdma_destroy_id(cmid);
1313 kiblnd_peer_connect_failed(peer, 1, rc);
1317 kiblnd_reconnect_peer(kib_peer_t *peer)
1319 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1320 char *reason = NULL;
1321 struct list_head txs;
1322 unsigned long flags;
1324 INIT_LIST_HEAD(&txs);
1326 write_lock_irqsave(glock, flags);
1327 if (peer->ibp_reconnecting == 0) {
1328 if (peer->ibp_accepting)
1329 reason = "accepting";
1330 else if (peer->ibp_connecting)
1331 reason = "connecting";
1332 else if (!list_empty(&peer->ibp_conns))
1333 reason = "connected";
1334 else /* connected then closed */
1340 LASSERT(!peer->ibp_accepting && !peer->ibp_connecting &&
1341 list_empty(&peer->ibp_conns));
1342 peer->ibp_reconnecting = 0;
1344 if (!kiblnd_peer_active(peer)) {
1345 list_splice_init(&peer->ibp_tx_queue, &txs);
1346 reason = "unlinked";
1350 peer->ibp_connecting++;
1351 peer->ibp_reconnected++;
1352 write_unlock_irqrestore(glock, flags);
1354 kiblnd_connect_peer(peer);
1358 write_unlock_irqrestore(glock, flags);
1360 CWARN("Abort reconnection of %s: %s\n",
1361 libcfs_nid2str(peer->ibp_nid), reason);
1362 kiblnd_txlist_done(peer->ibp_ni, &txs, -ECONNABORTED);
1367 kiblnd_launch_tx (lnet_ni_t *ni, kib_tx_t *tx, lnet_nid_t nid)
1372 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1373 unsigned long flags;
1376 /* If I get here, I've committed to send, so I complete the tx with
1377 * failure on any problems */
1379 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1380 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1382 /* First time, just use a read lock since I expect to find my peer
1384 read_lock_irqsave(g_lock, flags);
1386 peer = kiblnd_find_peer_locked(nid);
1387 if (peer != NULL && !list_empty(&peer->ibp_conns)) {
1388 /* Found a peer with an established connection */
1389 conn = kiblnd_get_conn_locked(peer);
1390 kiblnd_conn_addref(conn); /* 1 ref for me... */
1392 read_unlock_irqrestore(g_lock, flags);
1395 kiblnd_queue_tx(tx, conn);
1396 kiblnd_conn_decref(conn); /* ...to here */
1400 read_unlock(g_lock);
1401 /* Re-try with a write lock */
1404 peer = kiblnd_find_peer_locked(nid);
1406 if (list_empty(&peer->ibp_conns)) {
1407 /* found a peer, but it's still connecting... */
1408 LASSERT(kiblnd_peer_connecting(peer));
1410 list_add_tail(&tx->tx_list,
1411 &peer->ibp_tx_queue);
1412 write_unlock_irqrestore(g_lock, flags);
1414 conn = kiblnd_get_conn_locked(peer);
1415 kiblnd_conn_addref(conn); /* 1 ref for me... */
1417 write_unlock_irqrestore(g_lock, flags);
1420 kiblnd_queue_tx(tx, conn);
1421 kiblnd_conn_decref(conn); /* ...to here */
1426 write_unlock_irqrestore(g_lock, flags);
1428 /* Allocate a peer ready to add to the peer table and retry */
1429 rc = kiblnd_create_peer(ni, &peer, nid);
1431 CERROR("Can't create peer %s\n", libcfs_nid2str(nid));
1433 tx->tx_status = -EHOSTUNREACH;
1435 kiblnd_tx_done(ni, tx);
1440 write_lock_irqsave(g_lock, flags);
1442 peer2 = kiblnd_find_peer_locked(nid);
1443 if (peer2 != NULL) {
1444 if (list_empty(&peer2->ibp_conns)) {
1445 /* found a peer, but it's still connecting... */
1446 LASSERT(kiblnd_peer_connecting(peer2));
1448 list_add_tail(&tx->tx_list,
1449 &peer2->ibp_tx_queue);
1450 write_unlock_irqrestore(g_lock, flags);
1452 conn = kiblnd_get_conn_locked(peer2);
1453 kiblnd_conn_addref(conn); /* 1 ref for me... */
1455 write_unlock_irqrestore(g_lock, flags);
1458 kiblnd_queue_tx(tx, conn);
1459 kiblnd_conn_decref(conn); /* ...to here */
1462 kiblnd_peer_decref(peer);
1466 /* Brand new peer */
1467 LASSERT (peer->ibp_connecting == 0);
1468 peer->ibp_connecting = 1;
1470 /* always called with a ref on ni, which prevents ni being shutdown */
1471 LASSERT (((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1474 list_add_tail(&tx->tx_list, &peer->ibp_tx_queue);
1476 kiblnd_peer_addref(peer);
1477 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
1479 write_unlock_irqrestore(g_lock, flags);
1481 kiblnd_connect_peer(peer);
1482 kiblnd_peer_decref(peer);
1486 kiblnd_send (lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
1488 lnet_hdr_t *hdr = &lntmsg->msg_hdr;
1489 int type = lntmsg->msg_type;
1490 lnet_process_id_t target = lntmsg->msg_target;
1491 int target_is_router = lntmsg->msg_target_is_router;
1492 int routing = lntmsg->msg_routing;
1493 unsigned int payload_niov = lntmsg->msg_niov;
1494 struct kvec *payload_iov = lntmsg->msg_iov;
1495 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1496 unsigned int payload_offset = lntmsg->msg_offset;
1497 unsigned int payload_nob = lntmsg->msg_len;
1499 kib_rdma_desc_t *rd;
1504 /* NB 'private' is different depending on what we're sending.... */
1506 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1507 payload_nob, payload_niov, libcfs_id2str(target));
1509 LASSERT (payload_nob == 0 || payload_niov > 0);
1510 LASSERT (payload_niov <= LNET_MAX_IOV);
1512 /* Thread context */
1513 LASSERT (!in_interrupt());
1514 /* payload is either all vaddrs or all pages */
1515 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1523 LASSERT (payload_nob == 0);
1527 if (routing || target_is_router)
1528 break; /* send IMMEDIATE */
1530 /* is the REPLY message too small for RDMA? */
1531 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1532 if (nob <= IBLND_MSG_SIZE)
1533 break; /* send IMMEDIATE */
1535 tx = kiblnd_get_idle_tx(ni, target.nid);
1537 CERROR("Can't allocate txd for GET to %s\n",
1538 libcfs_nid2str(target.nid));
1543 rd = &ibmsg->ibm_u.get.ibgm_rd;
1544 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1545 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1546 lntmsg->msg_md->md_niov,
1547 lntmsg->msg_md->md_iov.iov,
1548 0, lntmsg->msg_md->md_length);
1550 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1551 lntmsg->msg_md->md_niov,
1552 lntmsg->msg_md->md_iov.kiov,
1553 0, lntmsg->msg_md->md_length);
1555 CERROR("Can't setup GET sink for %s: %d\n",
1556 libcfs_nid2str(target.nid), rc);
1557 kiblnd_tx_done(ni, tx);
1561 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1562 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1563 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1565 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1567 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1568 if (tx->tx_lntmsg[1] == NULL) {
1569 CERROR("Can't create reply for GET -> %s\n",
1570 libcfs_nid2str(target.nid));
1571 kiblnd_tx_done(ni, tx);
1575 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1576 tx->tx_waiting = 1; /* waiting for GET_DONE */
1577 kiblnd_launch_tx(ni, tx, target.nid);
1580 case LNET_MSG_REPLY:
1582 /* Is the payload small enough not to need RDMA? */
1583 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1584 if (nob <= IBLND_MSG_SIZE)
1585 break; /* send IMMEDIATE */
1587 tx = kiblnd_get_idle_tx(ni, target.nid);
1589 CERROR("Can't allocate %s txd for %s\n",
1590 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1591 libcfs_nid2str(target.nid));
1595 if (payload_kiov == NULL)
1596 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1597 payload_niov, payload_iov,
1598 payload_offset, payload_nob);
1600 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1601 payload_niov, payload_kiov,
1602 payload_offset, payload_nob);
1604 CERROR("Can't setup PUT src for %s: %d\n",
1605 libcfs_nid2str(target.nid), rc);
1606 kiblnd_tx_done(ni, tx);
1611 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1612 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1613 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1615 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1616 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1617 kiblnd_launch_tx(ni, tx, target.nid);
1621 /* send IMMEDIATE */
1623 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1626 tx = kiblnd_get_idle_tx(ni, target.nid);
1628 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1629 type, libcfs_nid2str(target.nid));
1634 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1636 if (payload_kiov != NULL)
1637 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1638 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1639 payload_niov, payload_kiov,
1640 payload_offset, payload_nob);
1642 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1643 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1644 payload_niov, payload_iov,
1645 payload_offset, payload_nob);
1647 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1648 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1650 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1651 kiblnd_launch_tx(ni, tx, target.nid);
1656 kiblnd_reply (lnet_ni_t *ni, kib_rx_t *rx, lnet_msg_t *lntmsg)
1658 lnet_process_id_t target = lntmsg->msg_target;
1659 unsigned int niov = lntmsg->msg_niov;
1660 struct kvec *iov = lntmsg->msg_iov;
1661 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1662 unsigned int offset = lntmsg->msg_offset;
1663 unsigned int nob = lntmsg->msg_len;
1667 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1669 CERROR("Can't get tx for REPLY to %s\n",
1670 libcfs_nid2str(target.nid));
1676 else if (kiov == NULL)
1677 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1678 niov, iov, offset, nob);
1680 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1681 niov, kiov, offset, nob);
1684 CERROR("Can't setup GET src for %s: %d\n",
1685 libcfs_nid2str(target.nid), rc);
1689 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1690 IBLND_MSG_GET_DONE, nob,
1691 &rx->rx_msg->ibm_u.get.ibgm_rd,
1692 rx->rx_msg->ibm_u.get.ibgm_cookie);
1694 CERROR("Can't setup rdma for GET from %s: %d\n",
1695 libcfs_nid2str(target.nid), rc);
1700 /* No RDMA: local completion may happen now! */
1701 lnet_finalize(ni, lntmsg, 0);
1703 /* RDMA: lnet_finalize(lntmsg) when it
1705 tx->tx_lntmsg[0] = lntmsg;
1708 kiblnd_queue_tx(tx, rx->rx_conn);
1712 kiblnd_tx_done(ni, tx);
1714 lnet_finalize(ni, lntmsg, -EIO);
1718 kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
1719 unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1720 unsigned int offset, unsigned int mlen, unsigned int rlen)
1722 kib_rx_t *rx = private;
1723 kib_msg_t *rxmsg = rx->rx_msg;
1724 kib_conn_t *conn = rx->rx_conn;
1727 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1730 LASSERT (mlen <= rlen);
1731 LASSERT (!in_interrupt());
1732 /* Either all pages or all vaddrs */
1733 LASSERT (!(kiov != NULL && iov != NULL));
1735 switch (rxmsg->ibm_type) {
1739 case IBLND_MSG_IMMEDIATE:
1740 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1741 if (nob > rx->rx_nob) {
1742 CERROR ("Immediate message from %s too big: %d(%d)\n",
1743 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1750 lnet_copy_flat2kiov(niov, kiov, offset,
1751 IBLND_MSG_SIZE, rxmsg,
1752 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1755 lnet_copy_flat2iov(niov, iov, offset,
1756 IBLND_MSG_SIZE, rxmsg,
1757 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1759 lnet_finalize (ni, lntmsg, 0);
1762 case IBLND_MSG_PUT_REQ: {
1764 kib_rdma_desc_t *rd;
1767 lnet_finalize(ni, lntmsg, 0);
1768 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, 0,
1769 rxmsg->ibm_u.putreq.ibprm_cookie);
1773 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1775 CERROR("Can't allocate tx for %s\n",
1776 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1777 /* Not replying will break the connection */
1783 rd = &txmsg->ibm_u.putack.ibpam_rd;
1785 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1786 niov, iov, offset, mlen);
1788 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1789 niov, kiov, offset, mlen);
1791 CERROR("Can't setup PUT sink for %s: %d\n",
1792 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1793 kiblnd_tx_done(ni, tx);
1794 /* tell peer it's over */
1795 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK, rc,
1796 rxmsg->ibm_u.putreq.ibprm_cookie);
1800 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1801 txmsg->ibm_u.putack.ibpam_src_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1802 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1804 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1806 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1807 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1808 kiblnd_queue_tx(tx, conn);
1810 /* reposted buffer reserved for PUT_DONE */
1811 post_credit = IBLND_POSTRX_NO_CREDIT;
1815 case IBLND_MSG_GET_REQ:
1816 if (lntmsg != NULL) {
1817 /* Optimized GET; RDMA lntmsg's payload */
1818 kiblnd_reply(ni, rx, lntmsg);
1820 /* GET didn't match anything */
1821 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1823 rxmsg->ibm_u.get.ibgm_cookie);
1828 kiblnd_post_rx(rx, post_credit);
1833 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1835 struct task_struct *task = kthread_run(fn, arg, name);
1838 return PTR_ERR(task);
1840 atomic_inc(&kiblnd_data.kib_nthreads);
1845 kiblnd_thread_fini (void)
1847 atomic_dec (&kiblnd_data.kib_nthreads);
1851 kiblnd_peer_alive (kib_peer_t *peer)
1853 /* This is racy, but everyone's only writing cfs_time_current() */
1854 peer->ibp_last_alive = cfs_time_current();
1859 kiblnd_peer_notify (kib_peer_t *peer)
1862 cfs_time_t last_alive = 0;
1863 unsigned long flags;
1865 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1867 if (kiblnd_peer_idle(peer) && peer->ibp_error != 0) {
1868 error = peer->ibp_error;
1869 peer->ibp_error = 0;
1871 last_alive = peer->ibp_last_alive;
1874 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1877 lnet_notify(peer->ibp_ni,
1878 peer->ibp_nid, 0, last_alive);
1882 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1884 /* This just does the immediate housekeeping. 'error' is zero for a
1885 * normal shutdown which can happen only after the connection has been
1886 * established. If the connection is established, schedule the
1887 * connection to be finished off by the connd. Otherwise the connd is
1888 * already dealing with it (either to set it up or tear it down).
1889 * Caller holds kib_global_lock exclusively in irq context */
1890 kib_peer_t *peer = conn->ibc_peer;
1892 unsigned long flags;
1894 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1896 if (error != 0 && conn->ibc_comms_error == 0)
1897 conn->ibc_comms_error = error;
1899 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1900 return; /* already being handled */
1903 list_empty(&conn->ibc_tx_noops) &&
1904 list_empty(&conn->ibc_tx_queue) &&
1905 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1906 list_empty(&conn->ibc_tx_queue_nocred) &&
1907 list_empty(&conn->ibc_active_txs)) {
1908 CDEBUG(D_NET, "closing conn to %s\n",
1909 libcfs_nid2str(peer->ibp_nid));
1911 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1912 libcfs_nid2str(peer->ibp_nid), error,
1913 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1914 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1915 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1916 "" : "(sending_rsrvd)",
1917 list_empty(&conn->ibc_tx_queue_nocred) ?
1918 "" : "(sending_nocred)",
1919 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1922 dev = ((kib_net_t *)peer->ibp_ni->ni_data)->ibn_dev;
1923 list_del(&conn->ibc_list);
1924 /* connd (see below) takes over ibc_list's ref */
1926 if (list_empty(&peer->ibp_conns) && /* no more conns */
1927 kiblnd_peer_active(peer)) { /* still in peer table */
1928 kiblnd_unlink_peer_locked(peer);
1930 /* set/clear error on last conn */
1931 peer->ibp_error = conn->ibc_comms_error;
1934 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1937 kiblnd_dev_can_failover(dev)) {
1938 list_add_tail(&dev->ibd_fail_list,
1939 &kiblnd_data.kib_failed_devs);
1940 wake_up(&kiblnd_data.kib_failover_waitq);
1943 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
1945 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
1946 wake_up(&kiblnd_data.kib_connd_waitq);
1948 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
1952 kiblnd_close_conn(kib_conn_t *conn, int error)
1954 unsigned long flags;
1956 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1958 kiblnd_close_conn_locked(conn, error);
1960 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1964 kiblnd_handle_early_rxs(kib_conn_t *conn)
1966 unsigned long flags;
1969 LASSERT(!in_interrupt());
1970 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1972 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1973 while (!list_empty(&conn->ibc_early_rxs)) {
1974 rx = list_entry(conn->ibc_early_rxs.next,
1976 list_del(&rx->rx_list);
1977 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1979 kiblnd_handle_rx(rx);
1981 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1983 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1987 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
1989 struct list_head zombies = LIST_HEAD_INIT(zombies);
1990 struct list_head *tmp;
1991 struct list_head *nxt;
1994 spin_lock(&conn->ibc_lock);
1996 list_for_each_safe(tmp, nxt, txs) {
1997 tx = list_entry(tmp, kib_tx_t, tx_list);
1999 if (txs == &conn->ibc_active_txs) {
2000 LASSERT(!tx->tx_queued);
2001 LASSERT(tx->tx_waiting ||
2002 tx->tx_sending != 0);
2004 LASSERT(tx->tx_queued);
2007 tx->tx_status = -ECONNABORTED;
2010 if (tx->tx_sending == 0) {
2012 list_del(&tx->tx_list);
2013 list_add(&tx->tx_list, &zombies);
2017 spin_unlock(&conn->ibc_lock);
2019 kiblnd_txlist_done(conn->ibc_peer->ibp_ni, &zombies, -ECONNABORTED);
2023 kiblnd_finalise_conn (kib_conn_t *conn)
2025 LASSERT (!in_interrupt());
2026 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2028 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2030 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2031 * for connections that didn't get as far as being connected, because
2032 * rdma_disconnect() does this for free. */
2033 kiblnd_abort_receives(conn);
2035 /* Complete all tx descs not waiting for sends to complete.
2036 * NB we should be safe from RDMA now that the QP has changed state */
2038 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2039 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2040 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2041 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2042 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2044 kiblnd_handle_early_rxs(conn);
2048 kiblnd_peer_connect_failed(kib_peer_t *peer, int active, int error)
2050 struct list_head zombies = LIST_HEAD_INIT(zombies);
2051 unsigned long flags;
2053 LASSERT (error != 0);
2054 LASSERT (!in_interrupt());
2056 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2059 LASSERT (peer->ibp_connecting > 0);
2060 peer->ibp_connecting--;
2062 LASSERT (peer->ibp_accepting > 0);
2063 peer->ibp_accepting--;
2066 if (kiblnd_peer_connecting(peer)) {
2067 /* another connection attempt under way... */
2068 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2073 peer->ibp_reconnected = 0;
2074 if (list_empty(&peer->ibp_conns)) {
2075 /* Take peer's blocked transmits to complete with error */
2076 list_add(&zombies, &peer->ibp_tx_queue);
2077 list_del_init(&peer->ibp_tx_queue);
2079 if (kiblnd_peer_active(peer))
2080 kiblnd_unlink_peer_locked(peer);
2082 peer->ibp_error = error;
2084 /* Can't have blocked transmits if there are connections */
2085 LASSERT(list_empty(&peer->ibp_tx_queue));
2088 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2090 kiblnd_peer_notify(peer);
2092 if (list_empty(&zombies))
2095 CNETERR("Deleting messages for %s: connection failed\n",
2096 libcfs_nid2str(peer->ibp_nid));
2098 kiblnd_txlist_done(peer->ibp_ni, &zombies, -EHOSTUNREACH);
2102 kiblnd_connreq_done(kib_conn_t *conn, int status)
2104 kib_peer_t *peer = conn->ibc_peer;
2106 struct list_head txs;
2107 unsigned long flags;
2110 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2112 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2113 libcfs_nid2str(peer->ibp_nid), active,
2114 conn->ibc_version, status);
2116 LASSERT (!in_interrupt());
2117 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2118 peer->ibp_connecting > 0) ||
2119 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2120 peer->ibp_accepting > 0));
2122 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2123 conn->ibc_connvars = NULL;
2126 /* failed to establish connection */
2127 kiblnd_peer_connect_failed(peer, active, status);
2128 kiblnd_finalise_conn(conn);
2132 /* connection established */
2133 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2135 conn->ibc_last_send = jiffies;
2136 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2137 kiblnd_peer_alive(peer);
2139 /* Add conn to peer's list and nuke any dangling conns from a different
2140 * peer instance... */
2141 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2142 list_add(&conn->ibc_list, &peer->ibp_conns);
2143 peer->ibp_reconnected = 0;
2145 peer->ibp_connecting--;
2147 peer->ibp_accepting--;
2149 if (peer->ibp_version == 0) {
2150 peer->ibp_version = conn->ibc_version;
2151 peer->ibp_incarnation = conn->ibc_incarnation;
2154 if (peer->ibp_version != conn->ibc_version ||
2155 peer->ibp_incarnation != conn->ibc_incarnation) {
2156 kiblnd_close_stale_conns_locked(peer, conn->ibc_version,
2157 conn->ibc_incarnation);
2158 peer->ibp_version = conn->ibc_version;
2159 peer->ibp_incarnation = conn->ibc_incarnation;
2162 /* grab pending txs while I have the lock */
2163 list_add(&txs, &peer->ibp_tx_queue);
2164 list_del_init(&peer->ibp_tx_queue);
2166 if (!kiblnd_peer_active(peer) || /* peer has been deleted */
2167 conn->ibc_comms_error != 0) { /* error has happened already */
2168 lnet_ni_t *ni = peer->ibp_ni;
2170 /* start to shut down connection */
2171 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2172 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2174 kiblnd_txlist_done(ni, &txs, -ECONNABORTED);
2179 /* refcount taken by cmid is not reliable after I released the glock
2180 * because this connection is visible to other threads now, another
2181 * thread can find and close this connection right after I released
2182 * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is
2183 * called, it can release the connection refcount taken by cmid.
2184 * It means the connection could be destroyed before I finish my
2187 kiblnd_conn_addref(conn);
2188 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2190 /* Schedule blocked txs */
2191 spin_lock(&conn->ibc_lock);
2192 while (!list_empty(&txs)) {
2193 tx = list_entry(txs.next, kib_tx_t, tx_list);
2194 list_del(&tx->tx_list);
2196 kiblnd_queue_tx_locked(tx, conn);
2198 spin_unlock(&conn->ibc_lock);
2200 kiblnd_check_sends(conn);
2202 /* schedule blocked rxs */
2203 kiblnd_handle_early_rxs(conn);
2205 kiblnd_conn_decref(conn);
2209 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2213 rc = rdma_reject(cmid, rej, sizeof(*rej));
2216 CWARN("Error %d sending reject\n", rc);
2220 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2222 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2223 kib_msg_t *reqmsg = priv;
2229 lnet_ni_t *ni = NULL;
2230 kib_net_t *net = NULL;
2232 struct rdma_conn_param cp;
2234 int version = IBLND_MSG_VERSION;
2235 unsigned long flags;
2237 struct sockaddr_in *peer_addr;
2238 LASSERT (!in_interrupt());
2240 /* cmid inherits 'context' from the corresponding listener id */
2241 ibdev = (kib_dev_t *)cmid->context;
2242 LASSERT (ibdev != NULL);
2244 memset(&rej, 0, sizeof(rej));
2245 rej.ibr_magic = IBLND_MSG_MAGIC;
2246 rej.ibr_why = IBLND_REJECT_FATAL;
2247 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2249 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2250 if (*kiblnd_tunables.kib_require_priv_port &&
2251 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2252 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2253 CERROR("Peer's port (%pI4h:%hu) is not privileged\n",
2254 &ip, ntohs(peer_addr->sin_port));
2258 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2259 CERROR("Short connection request\n");
2263 /* Future protocol version compatibility support! If the
2264 * o2iblnd-specific protocol changes, or when LNET unifies
2265 * protocols over all LNDs, the initial connection will
2266 * negotiate a protocol version. I trap this here to avoid
2267 * console errors; the reject tells the peer which protocol I
2269 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2270 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2272 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2273 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2274 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2276 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2277 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2278 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2281 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2283 CERROR("Can't parse connection request: %d\n", rc);
2287 nid = reqmsg->ibm_srcnid;
2288 ni = lnet_net2ni(LNET_NIDNET(reqmsg->ibm_dstnid));
2291 net = (kib_net_t *)ni->ni_data;
2292 rej.ibr_incarnation = net->ibn_incarnation;
2295 if (ni == NULL || /* no matching net */
2296 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2297 net->ibn_dev != ibdev) { /* wrong device */
2298 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2299 "bad dst nid %s\n", libcfs_nid2str(nid),
2300 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2301 ibdev->ibd_ifname, ibdev->ibd_nnets,
2303 libcfs_nid2str(reqmsg->ibm_dstnid));
2308 /* check time stamp as soon as possible */
2309 if (reqmsg->ibm_dststamp != 0 &&
2310 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2311 CWARN("Stale connection request\n");
2312 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2316 /* I can accept peer's version */
2317 version = reqmsg->ibm_version;
2319 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2320 CERROR("Unexpected connreq msg type: %x from %s\n",
2321 reqmsg->ibm_type, libcfs_nid2str(nid));
2325 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2326 kiblnd_msg_queue_size(version, ni)) {
2327 CERROR("Can't accept conn from %s, queue depth too large: "
2328 " %d (<=%d wanted)\n",
2329 libcfs_nid2str(nid),
2330 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2331 kiblnd_msg_queue_size(version, ni));
2333 if (version == IBLND_MSG_VERSION)
2334 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2339 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2340 kiblnd_rdma_frags(version, ni)) {
2341 CWARN("Can't accept conn from %s (version %x): "
2342 "max_frags %d too large (%d wanted)\n",
2343 libcfs_nid2str(nid), version,
2344 reqmsg->ibm_u.connparams.ibcp_max_frags,
2345 kiblnd_rdma_frags(version, ni));
2347 if (version >= IBLND_MSG_VERSION)
2348 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2351 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2352 kiblnd_rdma_frags(version, ni) &&
2353 net->ibn_fmr_ps == NULL) {
2354 CWARN("Can't accept conn from %s (version %x): "
2355 "max_frags %d incompatible without FMR pool "
2357 libcfs_nid2str(nid), version,
2358 reqmsg->ibm_u.connparams.ibcp_max_frags,
2359 kiblnd_rdma_frags(version, ni));
2361 if (version == IBLND_MSG_VERSION)
2362 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2367 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2368 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2369 libcfs_nid2str(nid),
2370 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2375 /* assume 'nid' is a new peer; create */
2376 rc = kiblnd_create_peer(ni, &peer, nid);
2378 CERROR("Can't create peer for %s\n", libcfs_nid2str(nid));
2379 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2383 /* We have validated the peer's parameters so use those */
2384 peer->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2385 peer->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2387 write_lock_irqsave(g_lock, flags);
2389 peer2 = kiblnd_find_peer_locked(nid);
2390 if (peer2 != NULL) {
2391 if (peer2->ibp_version == 0) {
2392 peer2->ibp_version = version;
2393 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2396 /* not the guy I've talked with */
2397 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2398 peer2->ibp_version != version) {
2399 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2401 if (kiblnd_peer_active(peer2)) {
2402 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2403 peer2->ibp_version = version;
2405 write_unlock_irqrestore(g_lock, flags);
2407 CWARN("Conn stale %s version %x/%x incarnation "LPU64"/"LPU64"\n",
2408 libcfs_nid2str(nid), peer2->ibp_version, version,
2409 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2411 kiblnd_peer_decref(peer);
2412 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2416 /* tie-break connection race in favour of the higher NID */
2417 if (peer2->ibp_connecting != 0 &&
2419 write_unlock_irqrestore(g_lock, flags);
2421 CWARN("Conn race %s\n", libcfs_nid2str(peer2->ibp_nid));
2423 kiblnd_peer_decref(peer);
2424 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2428 * passive connection is allowed even this peer is waiting for
2431 peer2->ibp_reconnecting = 0;
2432 peer2->ibp_accepting++;
2433 kiblnd_peer_addref(peer2);
2435 /* Race with kiblnd_launch_tx (active connect) to create peer
2436 * so copy validated parameters since we now know what the
2437 * peer's limits are */
2438 peer2->ibp_max_frags = peer->ibp_max_frags;
2439 peer2->ibp_queue_depth = peer->ibp_queue_depth;
2441 write_unlock_irqrestore(g_lock, flags);
2442 kiblnd_peer_decref(peer);
2445 /* Brand new peer */
2446 LASSERT (peer->ibp_accepting == 0);
2447 LASSERT (peer->ibp_version == 0 &&
2448 peer->ibp_incarnation == 0);
2450 peer->ibp_accepting = 1;
2451 peer->ibp_version = version;
2452 peer->ibp_incarnation = reqmsg->ibm_srcstamp;
2454 /* I have a ref on ni that prevents it being shutdown */
2455 LASSERT (net->ibn_shutdown == 0);
2457 kiblnd_peer_addref(peer);
2458 list_add_tail(&peer->ibp_list, kiblnd_nid2peerlist(nid));
2460 write_unlock_irqrestore(g_lock, flags);
2463 conn = kiblnd_create_conn(peer, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2465 kiblnd_peer_connect_failed(peer, 0, -ENOMEM);
2466 kiblnd_peer_decref(peer);
2467 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2471 /* conn now "owns" cmid, so I return success from here on to ensure the
2472 * CM callback doesn't destroy cmid. */
2473 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2474 conn->ibc_credits = conn->ibc_queue_depth;
2475 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2476 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2477 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2479 ackmsg = &conn->ibc_connvars->cv_msg;
2480 memset(ackmsg, 0, sizeof(*ackmsg));
2482 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2483 sizeof(ackmsg->ibm_u.connparams));
2484 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2485 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2486 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2488 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2490 memset(&cp, 0, sizeof(cp));
2491 cp.private_data = ackmsg;
2492 cp.private_data_len = ackmsg->ibm_nob;
2493 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2494 cp.initiator_depth = 0;
2495 cp.flow_control = 1;
2496 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2497 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2499 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2501 rc = rdma_accept(cmid, &cp);
2503 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2504 rej.ibr_version = version;
2505 rej.ibr_why = IBLND_REJECT_FATAL;
2507 kiblnd_reject(cmid, &rej);
2508 kiblnd_connreq_done(conn, rc);
2509 kiblnd_conn_decref(conn);
2519 rej.ibr_version = version;
2520 rej.ibr_cp.ibcp_queue_depth = kiblnd_msg_queue_size(version, ni);
2521 rej.ibr_cp.ibcp_max_frags = kiblnd_rdma_frags(version, ni);
2522 kiblnd_reject(cmid, &rej);
2524 return -ECONNREFUSED;
2528 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2529 __u64 incarnation, int why, kib_connparams_t *cp)
2531 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2532 kib_peer_t *peer = conn->ibc_peer;
2534 int msg_size = IBLND_MSG_SIZE;
2538 unsigned long flags;
2540 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2541 LASSERT(peer->ibp_connecting > 0); /* 'conn' at least */
2542 LASSERT(!peer->ibp_reconnecting);
2545 msg_size = cp->ibcp_max_msg_size;
2546 frag_num = cp->ibcp_max_frags;
2547 queue_dep = cp->ibcp_queue_depth;
2550 write_lock_irqsave(glock, flags);
2551 /* retry connection if it's still needed and no other connection
2552 * attempts (active or passive) are in progress
2553 * NB: reconnect is still needed even when ibp_tx_queue is
2554 * empty if ibp_version != version because reconnect may be
2555 * initiated by kiblnd_query() */
2556 reconnect = (!list_empty(&peer->ibp_tx_queue) ||
2557 peer->ibp_version != version) &&
2558 peer->ibp_connecting == 1 &&
2559 peer->ibp_accepting == 0;
2570 case IBLND_REJECT_RDMA_FRAGS: {
2571 struct lnet_ioctl_config_lnd_tunables *tunables;
2574 reason = "can't negotiate max frags";
2577 tunables = peer->ibp_ni->ni_lnd_tunables;
2578 if (!tunables->lt_tun_u.lt_o2ib.lnd_map_on_demand) {
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();