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, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/klnds/o2iblnd/o2iblnd_cb.c
34 * Author: Eric Barton <eric@bartonsoftware.com>
39 #define MAX_CONN_RACES_BEFORE_ABORT 20
41 static void kiblnd_peer_alive(kib_peer_ni_t *peer_ni);
42 static void kiblnd_peer_connect_failed(kib_peer_ni_t *peer_ni, int active, int error);
43 static void kiblnd_init_tx_msg(struct lnet_ni *ni, kib_tx_t *tx,
44 int type, int body_nob);
45 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
46 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
47 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
48 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
50 static void kiblnd_unmap_tx(kib_tx_t *tx);
51 static void kiblnd_check_sends_locked(kib_conn_t *conn);
54 kiblnd_tx_done(kib_tx_t *tx)
56 struct lnet_msg *lntmsg[2];
60 LASSERT (!in_interrupt());
61 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
62 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
63 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer_ni response */
64 LASSERT (tx->tx_pool != NULL);
68 /* tx may have up to 2 lnet msgs to finalise */
69 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
70 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
73 if (tx->tx_conn != NULL) {
74 kiblnd_conn_decref(tx->tx_conn);
78 tx->tx_nwrq = tx->tx_nsge = 0;
81 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
83 /* delay finalize until my descs have been freed */
84 for (i = 0; i < 2; i++) {
85 if (lntmsg[i] == NULL)
88 lnet_finalize(lntmsg[i], rc);
93 kiblnd_txlist_done(struct list_head *txlist, int status)
97 while (!list_empty(txlist)) {
98 tx = list_entry(txlist->next, kib_tx_t, tx_list);
100 list_del(&tx->tx_list);
103 tx->tx_status = status;
109 kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
111 kib_net_t *net = (kib_net_t *)ni->ni_data;
112 struct list_head *node;
114 kib_tx_poolset_t *tps;
116 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
117 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
120 tx = container_of(node, kib_tx_t, tx_list);
122 LASSERT (tx->tx_nwrq == 0);
123 LASSERT (!tx->tx_queued);
124 LASSERT (tx->tx_sending == 0);
125 LASSERT (!tx->tx_waiting);
126 LASSERT (tx->tx_status == 0);
127 LASSERT (tx->tx_conn == NULL);
128 LASSERT (tx->tx_lntmsg[0] == NULL);
129 LASSERT (tx->tx_lntmsg[1] == NULL);
130 LASSERT (tx->tx_nfrags == 0);
138 kiblnd_drop_rx(kib_rx_t *rx)
140 kib_conn_t *conn = rx->rx_conn;
141 struct kib_sched_info *sched = conn->ibc_sched;
144 spin_lock_irqsave(&sched->ibs_lock, flags);
145 LASSERT(conn->ibc_nrx > 0);
147 spin_unlock_irqrestore(&sched->ibs_lock, flags);
149 kiblnd_conn_decref(conn);
153 kiblnd_post_rx (kib_rx_t *rx, int credit)
155 kib_conn_t *conn = rx->rx_conn;
156 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
157 struct ib_recv_wr *bad_wrq = NULL;
158 #ifdef HAVE_IB_GET_DMA_MR
159 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
163 LASSERT (net != NULL);
164 LASSERT (!in_interrupt());
165 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
166 credit == IBLND_POSTRX_PEER_CREDIT ||
167 credit == IBLND_POSTRX_RSRVD_CREDIT);
168 #ifdef HAVE_IB_GET_DMA_MR
171 rx->rx_sge.lkey = mr->lkey;
173 rx->rx_sge.lkey = conn->ibc_hdev->ibh_pd->local_dma_lkey;
175 rx->rx_sge.addr = rx->rx_msgaddr;
176 rx->rx_sge.length = IBLND_MSG_SIZE;
178 rx->rx_wrq.next = NULL;
179 rx->rx_wrq.sg_list = &rx->rx_sge;
180 rx->rx_wrq.num_sge = 1;
181 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
183 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
184 LASSERT (rx->rx_nob >= 0); /* not posted */
186 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
187 kiblnd_drop_rx(rx); /* No more posts for this rx */
191 rx->rx_nob = -1; /* flag posted */
193 /* NB: need an extra reference after ib_post_recv because we don't
194 * own this rx (and rx::rx_conn) anymore, LU-5678.
196 kiblnd_conn_addref(conn);
197 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
198 if (unlikely(rc != 0)) {
199 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
200 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
204 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
207 if (unlikely(rc != 0)) {
208 kiblnd_close_conn(conn, rc);
209 kiblnd_drop_rx(rx); /* No more posts for this rx */
213 if (credit == IBLND_POSTRX_NO_CREDIT)
216 spin_lock(&conn->ibc_lock);
217 if (credit == IBLND_POSTRX_PEER_CREDIT)
218 conn->ibc_outstanding_credits++;
220 conn->ibc_reserved_credits++;
221 kiblnd_check_sends_locked(conn);
222 spin_unlock(&conn->ibc_lock);
225 kiblnd_conn_decref(conn);
230 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
232 struct list_head *tmp;
234 list_for_each(tmp, &conn->ibc_active_txs) {
235 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
237 LASSERT(!tx->tx_queued);
238 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
240 if (tx->tx_cookie != cookie)
243 if (tx->tx_waiting &&
244 tx->tx_msg->ibm_type == txtype)
247 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
248 tx->tx_waiting ? "" : "NOT ",
249 tx->tx_msg->ibm_type, txtype);
255 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
258 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
261 spin_lock(&conn->ibc_lock);
263 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
265 spin_unlock(&conn->ibc_lock);
267 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
268 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
269 kiblnd_close_conn(conn, -EPROTO);
273 if (tx->tx_status == 0) { /* success so far */
274 if (status < 0) { /* failed? */
275 tx->tx_status = status;
276 } else if (txtype == IBLND_MSG_GET_REQ) {
277 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
283 idle = !tx->tx_queued && (tx->tx_sending == 0);
285 list_del(&tx->tx_list);
287 spin_unlock(&conn->ibc_lock);
294 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
296 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
297 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
300 CERROR("Can't get tx for completion %x for %s\n",
301 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
305 tx->tx_msg->ibm_u.completion.ibcm_status = status;
306 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
307 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
309 kiblnd_queue_tx(tx, conn);
313 kiblnd_handle_rx (kib_rx_t *rx)
315 kib_msg_t *msg = rx->rx_msg;
316 kib_conn_t *conn = rx->rx_conn;
317 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
318 int credits = msg->ibm_credits;
324 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
326 CDEBUG (D_NET, "Received %x[%d] from %s\n",
327 msg->ibm_type, credits,
328 libcfs_nid2str(conn->ibc_peer->ibp_nid));
331 /* Have I received credits that will let me send? */
332 spin_lock(&conn->ibc_lock);
334 if (conn->ibc_credits + credits >
335 conn->ibc_queue_depth) {
336 rc2 = conn->ibc_credits;
337 spin_unlock(&conn->ibc_lock);
339 CERROR("Bad credits from %s: %d + %d > %d\n",
340 libcfs_nid2str(conn->ibc_peer->ibp_nid),
342 conn->ibc_queue_depth);
344 kiblnd_close_conn(conn, -EPROTO);
345 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
349 conn->ibc_credits += credits;
351 /* This ensures the credit taken by NOOP can be returned */
352 if (msg->ibm_type == IBLND_MSG_NOOP &&
353 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
354 conn->ibc_outstanding_credits++;
356 kiblnd_check_sends_locked(conn);
357 spin_unlock(&conn->ibc_lock);
360 switch (msg->ibm_type) {
362 CERROR("Bad IBLND message type %x from %s\n",
363 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
364 post_credit = IBLND_POSTRX_NO_CREDIT;
369 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
370 post_credit = IBLND_POSTRX_NO_CREDIT;
374 if (credits != 0) /* credit already posted */
375 post_credit = IBLND_POSTRX_NO_CREDIT;
376 else /* a keepalive NOOP */
377 post_credit = IBLND_POSTRX_PEER_CREDIT;
380 case IBLND_MSG_IMMEDIATE:
381 post_credit = IBLND_POSTRX_DONT_POST;
382 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
383 msg->ibm_srcnid, rx, 0);
384 if (rc < 0) /* repost on error */
385 post_credit = IBLND_POSTRX_PEER_CREDIT;
388 case IBLND_MSG_PUT_REQ:
389 post_credit = IBLND_POSTRX_DONT_POST;
390 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
391 msg->ibm_srcnid, rx, 1);
392 if (rc < 0) /* repost on error */
393 post_credit = IBLND_POSTRX_PEER_CREDIT;
396 case IBLND_MSG_PUT_NAK:
397 CWARN ("PUT_NACK from %s\n",
398 libcfs_nid2str(conn->ibc_peer->ibp_nid));
399 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
400 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
401 msg->ibm_u.completion.ibcm_status,
402 msg->ibm_u.completion.ibcm_cookie);
405 case IBLND_MSG_PUT_ACK:
406 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
408 spin_lock(&conn->ibc_lock);
409 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
410 msg->ibm_u.putack.ibpam_src_cookie);
412 list_del(&tx->tx_list);
413 spin_unlock(&conn->ibc_lock);
416 CERROR("Unmatched PUT_ACK from %s\n",
417 libcfs_nid2str(conn->ibc_peer->ibp_nid));
422 LASSERT (tx->tx_waiting);
423 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
424 * (a) I can overwrite tx_msg since my peer_ni has received it!
425 * (b) tx_waiting set tells tx_complete() it's not done. */
427 tx->tx_nwrq = tx->tx_nsge = 0; /* overwrite PUT_REQ */
429 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
430 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
431 &msg->ibm_u.putack.ibpam_rd,
432 msg->ibm_u.putack.ibpam_dst_cookie);
434 CERROR("Can't setup rdma for PUT to %s: %d\n",
435 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
437 spin_lock(&conn->ibc_lock);
438 tx->tx_waiting = 0; /* clear waiting and queue atomically */
439 kiblnd_queue_tx_locked(tx, conn);
440 spin_unlock(&conn->ibc_lock);
443 case IBLND_MSG_PUT_DONE:
444 post_credit = IBLND_POSTRX_PEER_CREDIT;
445 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
446 msg->ibm_u.completion.ibcm_status,
447 msg->ibm_u.completion.ibcm_cookie);
450 case IBLND_MSG_GET_REQ:
451 post_credit = IBLND_POSTRX_DONT_POST;
452 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
453 msg->ibm_srcnid, rx, 1);
454 if (rc < 0) /* repost on error */
455 post_credit = IBLND_POSTRX_PEER_CREDIT;
458 case IBLND_MSG_GET_DONE:
459 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
460 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
461 msg->ibm_u.completion.ibcm_status,
462 msg->ibm_u.completion.ibcm_cookie);
466 if (rc < 0) /* protocol error */
467 kiblnd_close_conn(conn, rc);
469 if (post_credit != IBLND_POSTRX_DONT_POST)
470 kiblnd_post_rx(rx, post_credit);
474 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
476 kib_msg_t *msg = rx->rx_msg;
477 kib_conn_t *conn = rx->rx_conn;
478 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
479 kib_net_t *net = ni->ni_data;
483 LASSERT (net != NULL);
484 LASSERT (rx->rx_nob < 0); /* was posted */
485 rx->rx_nob = 0; /* isn't now */
487 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
490 if (status != IB_WC_SUCCESS) {
491 CNETERR("Rx from %s failed: %d\n",
492 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
499 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
501 CERROR ("Error %d unpacking rx from %s\n",
502 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
506 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
507 msg->ibm_dstnid != ni->ni_nid ||
508 msg->ibm_srcstamp != conn->ibc_incarnation ||
509 msg->ibm_dststamp != net->ibn_incarnation) {
510 CERROR ("Stale rx from %s\n",
511 libcfs_nid2str(conn->ibc_peer->ibp_nid));
516 /* set time last known alive */
517 kiblnd_peer_alive(conn->ibc_peer);
519 /* racing with connection establishment/teardown! */
521 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
522 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
525 write_lock_irqsave(g_lock, flags);
526 /* must check holding global lock to eliminate race */
527 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
528 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
529 write_unlock_irqrestore(g_lock, flags);
532 write_unlock_irqrestore(g_lock, flags);
534 kiblnd_handle_rx(rx);
538 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
539 kiblnd_close_conn(conn, err);
541 kiblnd_drop_rx(rx); /* Don't re-post rx. */
545 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, __u32 nob)
549 kib_fmr_poolset_t *fps;
554 LASSERT(tx->tx_pool != NULL);
555 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
558 hdev = tx->tx_pool->tpo_hdev;
559 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
562 * If we're dealing with FastReg, but the device doesn't
563 * support GAPS and the tx has GAPS, then there is no real point
564 * in trying to map the memory, because it'll just fail. So
565 * preemptively fail with an appropriate message
567 if ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED) &&
568 !(dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT) &&
570 CERROR("Using FastReg with no GAPS support, but tx has gaps. "
571 "Try setting use_fastreg_gaps to 1\n");
572 return -EPROTONOSUPPORT;
576 * FMR does not support gaps but the tx has gaps then
577 * we should make sure that the number of fragments we'll be sending
578 * over fits within the number of fragments negotiated on the
579 * connection, otherwise, we won't be able to RDMA the data.
580 * We need to maintain the number of fragments negotiation on the
581 * connection for backwards compatibility.
583 if (tx->tx_gaps && (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)) {
585 tx->tx_conn->ibc_max_frags <= rd->rd_nfrags) {
586 CERROR("TX number of frags (%d) is <= than connection"
587 " number of frags (%d). Consider setting peer's"
588 " map_on_demand to 256\n", tx->tx_nfrags,
589 tx->tx_conn->ibc_max_frags);
594 fps = net->ibn_fmr_ps[cpt];
595 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
597 CERROR("Can't map %u pages: %d\n", nob, rc);
602 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
605 rd->rd_key = tx->tx_fmr.fmr_key;
607 * for FastReg or FMR with no gaps we can accumulate all
608 * the fragments in one FastReg or FMR fragment.
610 if (((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED) && !tx->tx_gaps) ||
611 (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
612 /* FMR requires zero based address */
613 if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
614 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
615 rd->rd_frags[0].rf_nob = nob;
619 * We're transmitting with gaps using FMR.
620 * We'll need to use multiple fragments and identify the
621 * zero based address of each fragment.
623 for (i = 0; i < rd->rd_nfrags; i++) {
624 rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
625 rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
633 kiblnd_unmap_tx(kib_tx_t *tx)
635 if (tx->tx_fmr.fmr_pfmr || tx->tx_fmr.fmr_frd)
636 kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);
638 if (tx->tx_nfrags != 0) {
639 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
640 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
645 #ifdef HAVE_IB_GET_DMA_MR
646 static struct ib_mr *
647 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, kib_rdma_desc_t *rd)
649 kib_net_t *net = ni->ni_data;
650 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
651 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
653 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
656 * if map-on-demand is turned on and the device supports
657 * either FMR or FastReg then use that. Otherwise use global
658 * memory regions. If that's not available either, then you're
659 * dead in the water and fail the operation.
661 if (tunables->lnd_map_on_demand &&
662 (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED ||
663 net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED))
667 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
668 * in the call chain. The mapping will fail with appropriate error
671 return hdev->ibh_mrs;
676 kiblnd_map_tx(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
678 kib_net_t *net = ni->ni_data;
679 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
680 #ifdef HAVE_IB_GET_DMA_MR
681 struct ib_mr *mr = NULL;
686 /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
688 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
689 tx->tx_nfrags = nfrags;
691 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
692 tx->tx_nfrags, tx->tx_dmadir);
694 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
695 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
696 hdev->ibh_ibdev, &tx->tx_frags[i]);
697 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
698 hdev->ibh_ibdev, &tx->tx_frags[i]);
699 nob += rd->rd_frags[i].rf_nob;
702 #ifdef HAVE_IB_GET_DMA_MR
703 mr = kiblnd_find_rd_dma_mr(ni, rd);
705 /* found pre-mapping MR */
706 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
711 if (net->ibn_fmr_ps != NULL)
712 return kiblnd_fmr_map_tx(net, tx, rd, nob);
718 kiblnd_setup_rd_iov(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
719 unsigned int niov, struct kvec *iov, int offset, int nob)
721 kib_net_t *net = ni->ni_data;
723 struct scatterlist *sg;
727 unsigned int max_niov;
731 LASSERT (net != NULL);
733 while (offset >= iov->iov_len) {
734 offset -= iov->iov_len;
746 vaddr = ((unsigned long)iov->iov_base) + offset;
747 page_offset = vaddr & (PAGE_SIZE - 1);
748 page = lnet_kvaddr_to_page(vaddr);
750 CERROR("Can't find page\n");
754 fragnob = min((int)(iov->iov_len - offset), nob);
755 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
758 * We're allowed to start at a non-aligned page offset in
759 * the first fragment and end at a non-aligned page offset
760 * in the last fragment.
762 if ((fragnob < (int)PAGE_SIZE - page_offset) &&
763 (niov < max_niov) && nob > fragnob) {
764 CDEBUG(D_NET, "fragnob %d < available page %d: with"
765 " remaining %d iovs with %d nob left\n",
766 fragnob, (int)PAGE_SIZE - page_offset, niov,
771 sg_set_page(sg, page, fragnob, page_offset);
774 CERROR("lacking enough sg entries to map tx\n");
778 if (offset + fragnob < iov->iov_len) {
788 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
792 kiblnd_setup_rd_kiov(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
793 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
795 kib_net_t *net = ni->ni_data;
796 struct scatterlist *sg;
800 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
804 LASSERT(net != NULL);
806 while (offset >= kiov->kiov_len) {
807 offset -= kiov->kiov_len;
819 fragnob = min((int)(kiov->kiov_len - offset), nob);
822 * We're allowed to start at a non-aligned page offset in
823 * the first fragment and end at a non-aligned page offset
824 * in the last fragment.
826 if ((fragnob < (int)(kiov->kiov_len - offset)) &&
827 nkiov < max_nkiov && nob > fragnob) {
828 CDEBUG(D_NET, "fragnob %d < available page %d: with"
829 " remaining %d kiovs with %d nob left\n",
830 fragnob, (int)(kiov->kiov_len - offset),
835 sg_set_page(sg, kiov->kiov_page, fragnob,
836 kiov->kiov_offset + offset);
839 CERROR("lacking enough sg entries to map tx\n");
849 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
853 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
854 __must_hold(&conn->ibc_lock)
856 kib_msg_t *msg = tx->tx_msg;
857 kib_peer_ni_t *peer_ni = conn->ibc_peer;
858 int ver = conn->ibc_version;
862 LASSERT(tx->tx_queued);
863 /* We rely on this for QP sizing */
864 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
865 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
867 LASSERT(credit == 0 || credit == 1);
868 LASSERT(conn->ibc_outstanding_credits >= 0);
869 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
870 LASSERT(conn->ibc_credits >= 0);
871 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
873 if (conn->ibc_nsends_posted ==
874 conn->ibc_queue_depth) {
875 /* tx completions outstanding... */
876 CDEBUG(D_NET, "%s: posted enough\n",
877 libcfs_nid2str(peer_ni->ibp_nid));
881 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
882 CDEBUG(D_NET, "%s: no credits\n",
883 libcfs_nid2str(peer_ni->ibp_nid));
887 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
888 conn->ibc_credits == 1 && /* last credit reserved */
889 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
890 CDEBUG(D_NET, "%s: not using last credit\n",
891 libcfs_nid2str(peer_ni->ibp_nid));
895 /* NB don't drop ibc_lock before bumping tx_sending */
896 list_del(&tx->tx_list);
899 if (msg->ibm_type == IBLND_MSG_NOOP &&
900 (!kiblnd_need_noop(conn) || /* redundant NOOP */
901 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
902 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
903 /* OK to drop when posted enough NOOPs, since
904 * kiblnd_check_sends_locked will queue NOOP again when
905 * posted NOOPs complete */
906 spin_unlock(&conn->ibc_lock);
908 spin_lock(&conn->ibc_lock);
909 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
910 libcfs_nid2str(peer_ni->ibp_nid),
911 conn->ibc_noops_posted);
915 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
916 peer_ni->ibp_nid, conn->ibc_incarnation);
918 conn->ibc_credits -= credit;
919 conn->ibc_outstanding_credits = 0;
920 conn->ibc_nsends_posted++;
921 if (msg->ibm_type == IBLND_MSG_NOOP)
922 conn->ibc_noops_posted++;
924 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
925 * PUT. If so, it was first queued here as a PUT_REQ, sent and
926 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
927 * and then re-queued here. It's (just) possible that
928 * tx_sending is non-zero if we've not done the tx_complete()
929 * from the first send; hence the ++ rather than = below. */
931 list_add(&tx->tx_list, &conn->ibc_active_txs);
933 /* I'm still holding ibc_lock! */
934 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
936 } else if (tx->tx_pool->tpo_pool.po_failed ||
937 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
938 /* close_conn will launch failover */
941 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
942 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
943 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
946 if (!frd->frd_valid) {
947 wr = &frd->frd_inv_wr.wr;
948 wr->next = &frd->frd_fastreg_wr.wr;
950 wr = &frd->frd_fastreg_wr.wr;
952 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
955 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
956 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
957 bad->wr_id, bad->opcode, bad->send_flags,
958 libcfs_nid2str(conn->ibc_peer->ibp_nid));
961 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
964 conn->ibc_last_send = ktime_get();
969 /* NB credits are transferred in the actual
970 * message, which can only be the last work item */
971 conn->ibc_credits += credit;
972 conn->ibc_outstanding_credits += msg->ibm_credits;
973 conn->ibc_nsends_posted--;
974 if (msg->ibm_type == IBLND_MSG_NOOP)
975 conn->ibc_noops_posted--;
981 done = (tx->tx_sending == 0);
983 list_del(&tx->tx_list);
985 spin_unlock(&conn->ibc_lock);
987 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
988 CERROR("Error %d posting transmit to %s\n",
989 rc, libcfs_nid2str(peer_ni->ibp_nid));
991 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
992 rc, libcfs_nid2str(peer_ni->ibp_nid));
994 kiblnd_close_conn(conn, rc);
999 spin_lock(&conn->ibc_lock);
1005 kiblnd_check_sends_locked(kib_conn_t *conn)
1007 int ver = conn->ibc_version;
1008 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
1011 /* Don't send anything until after the connection is established */
1012 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
1013 CDEBUG(D_NET, "%s too soon\n",
1014 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1018 LASSERT(conn->ibc_nsends_posted <=
1019 conn->ibc_queue_depth);
1020 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
1021 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
1022 LASSERT (conn->ibc_reserved_credits >= 0);
1024 while (conn->ibc_reserved_credits > 0 &&
1025 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
1026 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
1028 list_del(&tx->tx_list);
1029 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
1030 conn->ibc_reserved_credits--;
1033 if (kiblnd_need_noop(conn)) {
1034 spin_unlock(&conn->ibc_lock);
1036 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1038 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
1040 spin_lock(&conn->ibc_lock);
1042 kiblnd_queue_tx_locked(tx, conn);
1048 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1050 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1052 } else if (!list_empty(&conn->ibc_tx_noops)) {
1053 LASSERT (!IBLND_OOB_CAPABLE(ver));
1055 tx = list_entry(conn->ibc_tx_noops.next,
1057 } else if (!list_empty(&conn->ibc_tx_queue)) {
1059 tx = list_entry(conn->ibc_tx_queue.next,
1064 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1070 kiblnd_tx_complete (kib_tx_t *tx, int status)
1072 int failed = (status != IB_WC_SUCCESS);
1073 kib_conn_t *conn = tx->tx_conn;
1076 LASSERT (tx->tx_sending > 0);
1079 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1080 CNETERR("Tx -> %s cookie %#llx"
1081 " sending %d waiting %d: failed %d\n",
1082 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1083 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1086 kiblnd_close_conn(conn, -EIO);
1088 kiblnd_peer_alive(conn->ibc_peer);
1091 spin_lock(&conn->ibc_lock);
1093 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1094 * gets to free it, which also drops its ref on 'conn'. */
1097 conn->ibc_nsends_posted--;
1098 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1099 conn->ibc_noops_posted--;
1102 tx->tx_waiting = 0; /* don't wait for peer_ni */
1103 tx->tx_status = -EIO;
1106 idle = (tx->tx_sending == 0) && /* This is the final callback */
1107 !tx->tx_waiting && /* Not waiting for peer_ni */
1108 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1110 list_del(&tx->tx_list);
1112 kiblnd_check_sends_locked(conn);
1113 spin_unlock(&conn->ibc_lock);
1120 kiblnd_init_tx_msg(struct lnet_ni *ni, kib_tx_t *tx, int type, int body_nob)
1122 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1123 struct ib_sge *sge = &tx->tx_msgsge;
1124 struct ib_rdma_wr *wrq;
1125 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1126 #ifdef HAVE_IB_GET_DMA_MR
1127 struct ib_mr *mr = hdev->ibh_mrs;
1130 LASSERT(tx->tx_nwrq >= 0);
1131 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1132 LASSERT(nob <= IBLND_MSG_SIZE);
1133 #ifdef HAVE_IB_GET_DMA_MR
1134 LASSERT(mr != NULL);
1137 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1139 #ifdef HAVE_IB_GET_DMA_MR
1140 sge->lkey = mr->lkey;
1142 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1144 sge->addr = tx->tx_msgaddr;
1147 wrq = &tx->tx_wrq[tx->tx_nwrq];
1148 memset(wrq, 0, sizeof(*wrq));
1150 wrq->wr.next = NULL;
1151 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1152 wrq->wr.sg_list = sge;
1153 wrq->wr.num_sge = 1;
1154 wrq->wr.opcode = IB_WR_SEND;
1155 wrq->wr.send_flags = IB_SEND_SIGNALED;
1161 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1162 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1164 kib_msg_t *ibmsg = tx->tx_msg;
1165 kib_rdma_desc_t *srcrd = tx->tx_rd;
1166 struct ib_rdma_wr *wrq = NULL;
1174 LASSERT(!in_interrupt());
1175 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1176 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1178 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1179 resid > 0; resid -= sge_nob) {
1182 if (srcidx >= srcrd->rd_nfrags) {
1183 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1188 if (dstidx >= dstrd->rd_nfrags) {
1189 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1194 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1195 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1196 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1197 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1198 conn->ibc_max_frags,
1199 srcidx, srcrd->rd_nfrags,
1200 dstidx, dstrd->rd_nfrags);
1205 sge_nob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1206 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1208 sge = &tx->tx_sge[tx->tx_nsge];
1209 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1210 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1211 sge->length = sge_nob;
1214 wrq = &tx->tx_wrq[tx->tx_nwrq];
1216 wrq->wr.next = &(wrq + 1)->wr;
1217 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1218 wrq->wr.sg_list = sge;
1219 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1220 wrq->wr.send_flags = 0;
1222 #ifdef HAVE_IB_RDMA_WR
1223 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1225 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1228 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1230 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1235 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1236 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1239 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1241 wrq->wr.num_sge = wrq_sge;
1247 if (rc < 0) /* no RDMA if completing with failure */
1248 tx->tx_nwrq = tx->tx_nsge = 0;
1250 ibmsg->ibm_u.completion.ibcm_status = rc;
1251 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1252 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1253 type, sizeof (kib_completion_msg_t));
1259 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1261 struct list_head *q;
1264 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1265 LASSERT(!tx->tx_queued); /* not queued for sending already */
1266 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1268 timeout_ns = *kiblnd_tunables.kib_timeout * NSEC_PER_SEC;
1270 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1272 if (tx->tx_conn == NULL) {
1273 kiblnd_conn_addref(conn);
1275 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1277 /* PUT_DONE first attached to conn as a PUT_REQ */
1278 LASSERT (tx->tx_conn == conn);
1279 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1282 switch (tx->tx_msg->ibm_type) {
1286 case IBLND_MSG_PUT_REQ:
1287 case IBLND_MSG_GET_REQ:
1288 q = &conn->ibc_tx_queue_rsrvd;
1291 case IBLND_MSG_PUT_NAK:
1292 case IBLND_MSG_PUT_ACK:
1293 case IBLND_MSG_PUT_DONE:
1294 case IBLND_MSG_GET_DONE:
1295 q = &conn->ibc_tx_queue_nocred;
1298 case IBLND_MSG_NOOP:
1299 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1300 q = &conn->ibc_tx_queue_nocred;
1302 q = &conn->ibc_tx_noops;
1305 case IBLND_MSG_IMMEDIATE:
1306 q = &conn->ibc_tx_queue;
1310 list_add_tail(&tx->tx_list, q);
1314 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1316 spin_lock(&conn->ibc_lock);
1317 kiblnd_queue_tx_locked(tx, conn);
1318 kiblnd_check_sends_locked(conn);
1319 spin_unlock(&conn->ibc_lock);
1322 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1323 struct sockaddr_in *srcaddr,
1324 struct sockaddr_in *dstaddr,
1327 unsigned short port;
1330 /* allow the port to be reused */
1331 rc = rdma_set_reuseaddr(cmid, 1);
1333 CERROR("Unable to set reuse on cmid: %d\n", rc);
1337 /* look for a free privileged port */
1338 for (port = PROT_SOCK-1; port > 0; port--) {
1339 srcaddr->sin_port = htons(port);
1340 rc = rdma_resolve_addr(cmid,
1341 (struct sockaddr *)srcaddr,
1342 (struct sockaddr *)dstaddr,
1345 CDEBUG(D_NET, "bound to port %hu\n", port);
1347 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1348 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1355 CERROR("Failed to bind to a free privileged port\n");
1360 kiblnd_connect_peer (kib_peer_ni_t *peer_ni)
1362 struct rdma_cm_id *cmid;
1364 kib_net_t *net = peer_ni->ibp_ni->ni_data;
1365 struct sockaddr_in srcaddr;
1366 struct sockaddr_in dstaddr;
1369 LASSERT (net != NULL);
1370 LASSERT (peer_ni->ibp_connecting > 0);
1372 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer_ni, RDMA_PS_TCP,
1376 CERROR("Can't create CMID for %s: %ld\n",
1377 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1383 memset(&srcaddr, 0, sizeof(srcaddr));
1384 srcaddr.sin_family = AF_INET;
1385 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1387 memset(&dstaddr, 0, sizeof(dstaddr));
1388 dstaddr.sin_family = AF_INET;
1389 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1390 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1392 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1394 if (*kiblnd_tunables.kib_use_priv_port) {
1395 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1396 *kiblnd_tunables.kib_timeout * 1000);
1398 rc = rdma_resolve_addr(cmid,
1399 (struct sockaddr *)&srcaddr,
1400 (struct sockaddr *)&dstaddr,
1401 *kiblnd_tunables.kib_timeout * 1000);
1404 /* Can't initiate address resolution: */
1405 CERROR("Can't resolve addr for %s: %d\n",
1406 libcfs_nid2str(peer_ni->ibp_nid), rc);
1413 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1414 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1415 rdma_destroy_id(cmid);
1418 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1422 kiblnd_reconnect_peer(kib_peer_ni_t *peer_ni)
1424 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1425 char *reason = NULL;
1426 struct list_head txs;
1427 unsigned long flags;
1429 INIT_LIST_HEAD(&txs);
1431 write_lock_irqsave(glock, flags);
1432 if (peer_ni->ibp_reconnecting == 0) {
1433 if (peer_ni->ibp_accepting)
1434 reason = "accepting";
1435 else if (peer_ni->ibp_connecting)
1436 reason = "connecting";
1437 else if (!list_empty(&peer_ni->ibp_conns))
1438 reason = "connected";
1439 else /* connected then closed */
1445 if (peer_ni->ibp_accepting)
1446 CNETERR("Detecting race between accepting and reconnecting\n");
1447 peer_ni->ibp_reconnecting--;
1449 if (!kiblnd_peer_active(peer_ni)) {
1450 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1451 reason = "unlinked";
1455 peer_ni->ibp_connecting++;
1456 peer_ni->ibp_reconnected++;
1458 write_unlock_irqrestore(glock, flags);
1460 kiblnd_connect_peer(peer_ni);
1464 write_unlock_irqrestore(glock, flags);
1466 CWARN("Abort reconnection of %s: %s\n",
1467 libcfs_nid2str(peer_ni->ibp_nid), reason);
1468 kiblnd_txlist_done(&txs, -ECONNABORTED);
1473 kiblnd_launch_tx(struct lnet_ni *ni, kib_tx_t *tx, lnet_nid_t nid)
1475 kib_peer_ni_t *peer_ni;
1476 kib_peer_ni_t *peer2;
1478 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1479 unsigned long flags;
1482 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1484 /* If I get here, I've committed to send, so I complete the tx with
1485 * failure on any problems */
1487 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1488 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1490 /* First time, just use a read lock since I expect to find my peer_ni
1492 read_lock_irqsave(g_lock, flags);
1494 peer_ni = kiblnd_find_peer_locked(ni, nid);
1495 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1496 /* Found a peer_ni with an established connection */
1497 conn = kiblnd_get_conn_locked(peer_ni);
1498 kiblnd_conn_addref(conn); /* 1 ref for me... */
1500 read_unlock_irqrestore(g_lock, flags);
1503 kiblnd_queue_tx(tx, conn);
1504 kiblnd_conn_decref(conn); /* ...to here */
1508 read_unlock(g_lock);
1509 /* Re-try with a write lock */
1512 peer_ni = kiblnd_find_peer_locked(ni, nid);
1513 if (peer_ni != NULL) {
1514 if (list_empty(&peer_ni->ibp_conns)) {
1515 /* found a peer_ni, but it's still connecting... */
1516 LASSERT(kiblnd_peer_connecting(peer_ni));
1518 list_add_tail(&tx->tx_list,
1519 &peer_ni->ibp_tx_queue);
1520 write_unlock_irqrestore(g_lock, flags);
1522 conn = kiblnd_get_conn_locked(peer_ni);
1523 kiblnd_conn_addref(conn); /* 1 ref for me... */
1525 write_unlock_irqrestore(g_lock, flags);
1528 kiblnd_queue_tx(tx, conn);
1529 kiblnd_conn_decref(conn); /* ...to here */
1534 write_unlock_irqrestore(g_lock, flags);
1536 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1537 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1539 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1541 tx->tx_status = -EHOSTUNREACH;
1548 write_lock_irqsave(g_lock, flags);
1550 peer2 = kiblnd_find_peer_locked(ni, nid);
1551 if (peer2 != NULL) {
1552 if (list_empty(&peer2->ibp_conns)) {
1553 /* found a peer_ni, but it's still connecting... */
1554 LASSERT(kiblnd_peer_connecting(peer2));
1556 list_add_tail(&tx->tx_list,
1557 &peer2->ibp_tx_queue);
1558 write_unlock_irqrestore(g_lock, flags);
1560 conn = kiblnd_get_conn_locked(peer2);
1561 kiblnd_conn_addref(conn); /* 1 ref for me... */
1563 write_unlock_irqrestore(g_lock, flags);
1566 kiblnd_queue_tx(tx, conn);
1567 kiblnd_conn_decref(conn); /* ...to here */
1570 kiblnd_peer_decref(peer_ni);
1574 /* Brand new peer_ni */
1575 LASSERT(peer_ni->ibp_connecting == 0);
1576 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1577 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1579 /* always called with a ref on ni, which prevents ni being shutdown */
1580 LASSERT(((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1583 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1585 kiblnd_peer_addref(peer_ni);
1586 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1588 write_unlock_irqrestore(g_lock, flags);
1590 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1591 kiblnd_connect_peer(peer_ni);
1592 kiblnd_peer_decref(peer_ni);
1596 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1598 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1599 int type = lntmsg->msg_type;
1600 struct lnet_process_id target = lntmsg->msg_target;
1601 int target_is_router = lntmsg->msg_target_is_router;
1602 int routing = lntmsg->msg_routing;
1603 unsigned int payload_niov = lntmsg->msg_niov;
1604 struct kvec *payload_iov = lntmsg->msg_iov;
1605 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1606 unsigned int payload_offset = lntmsg->msg_offset;
1607 unsigned int payload_nob = lntmsg->msg_len;
1609 kib_rdma_desc_t *rd;
1614 /* NB 'private' is different depending on what we're sending.... */
1616 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1617 payload_nob, payload_niov, libcfs_id2str(target));
1619 LASSERT (payload_nob == 0 || payload_niov > 0);
1620 LASSERT (payload_niov <= LNET_MAX_IOV);
1622 /* Thread context */
1623 LASSERT (!in_interrupt());
1624 /* payload is either all vaddrs or all pages */
1625 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1633 LASSERT (payload_nob == 0);
1637 if (routing || target_is_router)
1638 break; /* send IMMEDIATE */
1640 /* is the REPLY message too small for RDMA? */
1641 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1642 if (nob <= IBLND_MSG_SIZE)
1643 break; /* send IMMEDIATE */
1645 tx = kiblnd_get_idle_tx(ni, target.nid);
1647 CERROR("Can't allocate txd for GET to %s\n",
1648 libcfs_nid2str(target.nid));
1653 rd = &ibmsg->ibm_u.get.ibgm_rd;
1654 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1655 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1656 lntmsg->msg_md->md_niov,
1657 lntmsg->msg_md->md_iov.iov,
1658 0, lntmsg->msg_md->md_length);
1660 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1661 lntmsg->msg_md->md_niov,
1662 lntmsg->msg_md->md_iov.kiov,
1663 0, lntmsg->msg_md->md_length);
1665 CERROR("Can't setup GET sink for %s: %d\n",
1666 libcfs_nid2str(target.nid), rc);
1671 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1672 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1673 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1675 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1677 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1678 if (tx->tx_lntmsg[1] == NULL) {
1679 CERROR("Can't create reply for GET -> %s\n",
1680 libcfs_nid2str(target.nid));
1685 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1686 tx->tx_waiting = 1; /* waiting for GET_DONE */
1687 kiblnd_launch_tx(ni, tx, target.nid);
1690 case LNET_MSG_REPLY:
1692 /* Is the payload small enough not to need RDMA? */
1693 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1694 if (nob <= IBLND_MSG_SIZE)
1695 break; /* send IMMEDIATE */
1697 tx = kiblnd_get_idle_tx(ni, target.nid);
1699 CERROR("Can't allocate %s txd for %s\n",
1700 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1701 libcfs_nid2str(target.nid));
1705 if (payload_kiov == NULL)
1706 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1707 payload_niov, payload_iov,
1708 payload_offset, payload_nob);
1710 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1711 payload_niov, payload_kiov,
1712 payload_offset, payload_nob);
1714 CERROR("Can't setup PUT src for %s: %d\n",
1715 libcfs_nid2str(target.nid), rc);
1721 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1722 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1723 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1725 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1726 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1727 kiblnd_launch_tx(ni, tx, target.nid);
1731 /* send IMMEDIATE */
1733 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1736 tx = kiblnd_get_idle_tx(ni, target.nid);
1738 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1739 type, libcfs_nid2str(target.nid));
1744 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1746 if (payload_kiov != NULL)
1747 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1748 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1749 payload_niov, payload_kiov,
1750 payload_offset, payload_nob);
1752 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1753 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1754 payload_niov, payload_iov,
1755 payload_offset, payload_nob);
1757 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1758 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1760 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1761 kiblnd_launch_tx(ni, tx, target.nid);
1766 kiblnd_reply(struct lnet_ni *ni, kib_rx_t *rx, struct lnet_msg *lntmsg)
1768 struct lnet_process_id target = lntmsg->msg_target;
1769 unsigned int niov = lntmsg->msg_niov;
1770 struct kvec *iov = lntmsg->msg_iov;
1771 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1772 unsigned int offset = lntmsg->msg_offset;
1773 unsigned int nob = lntmsg->msg_len;
1777 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1779 CERROR("Can't get tx for REPLY to %s\n",
1780 libcfs_nid2str(target.nid));
1786 else if (kiov == NULL)
1787 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1788 niov, iov, offset, nob);
1790 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1791 niov, kiov, offset, nob);
1794 CERROR("Can't setup GET src for %s: %d\n",
1795 libcfs_nid2str(target.nid), rc);
1799 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1800 IBLND_MSG_GET_DONE, nob,
1801 &rx->rx_msg->ibm_u.get.ibgm_rd,
1802 rx->rx_msg->ibm_u.get.ibgm_cookie);
1804 CERROR("Can't setup rdma for GET from %s: %d\n",
1805 libcfs_nid2str(target.nid), rc);
1810 /* No RDMA: local completion may happen now! */
1811 lnet_finalize(lntmsg, 0);
1813 /* RDMA: lnet_finalize(lntmsg) when it
1815 tx->tx_lntmsg[0] = lntmsg;
1818 kiblnd_queue_tx(tx, rx->rx_conn);
1824 lnet_finalize(lntmsg, -EIO);
1828 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1829 int delayed, unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1830 unsigned int offset, unsigned int mlen, unsigned int rlen)
1832 kib_rx_t *rx = private;
1833 kib_msg_t *rxmsg = rx->rx_msg;
1834 kib_conn_t *conn = rx->rx_conn;
1838 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1841 LASSERT (mlen <= rlen);
1842 LASSERT (!in_interrupt());
1843 /* Either all pages or all vaddrs */
1844 LASSERT (!(kiov != NULL && iov != NULL));
1846 switch (rxmsg->ibm_type) {
1850 case IBLND_MSG_IMMEDIATE:
1851 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1852 if (nob > rx->rx_nob) {
1853 CERROR ("Immediate message from %s too big: %d(%d)\n",
1854 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1861 lnet_copy_flat2kiov(niov, kiov, offset,
1862 IBLND_MSG_SIZE, rxmsg,
1863 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1866 lnet_copy_flat2iov(niov, iov, offset,
1867 IBLND_MSG_SIZE, rxmsg,
1868 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1870 lnet_finalize(lntmsg, 0);
1873 case IBLND_MSG_PUT_REQ: {
1875 kib_rdma_desc_t *rd;
1876 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1879 lnet_finalize(lntmsg, 0);
1880 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1885 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1887 CERROR("Can't allocate tx for %s\n",
1888 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1889 /* Not replying will break the connection */
1895 rd = &txmsg->ibm_u.putack.ibpam_rd;
1897 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1898 niov, iov, offset, mlen);
1900 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1901 niov, kiov, offset, mlen);
1903 CERROR("Can't setup PUT sink for %s: %d\n",
1904 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1906 /* tell peer_ni it's over */
1907 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1912 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1913 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1914 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1916 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1918 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1919 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1920 kiblnd_queue_tx(tx, conn);
1922 /* reposted buffer reserved for PUT_DONE */
1923 post_credit = IBLND_POSTRX_NO_CREDIT;
1927 case IBLND_MSG_GET_REQ:
1928 if (lntmsg != NULL) {
1929 /* Optimized GET; RDMA lntmsg's payload */
1930 kiblnd_reply(ni, rx, lntmsg);
1932 /* GET didn't match anything */
1933 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1935 rxmsg->ibm_u.get.ibgm_cookie);
1940 kiblnd_post_rx(rx, post_credit);
1945 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1947 struct task_struct *task = kthread_run(fn, arg, name);
1950 return PTR_ERR(task);
1952 atomic_inc(&kiblnd_data.kib_nthreads);
1957 kiblnd_thread_fini (void)
1959 atomic_dec (&kiblnd_data.kib_nthreads);
1963 kiblnd_peer_alive (kib_peer_ni_t *peer_ni)
1965 /* This is racy, but everyone's only writing ktime_get_seconds() */
1966 peer_ni->ibp_last_alive = ktime_get_seconds();
1971 kiblnd_peer_notify (kib_peer_ni_t *peer_ni)
1974 time64_t last_alive = 0;
1975 unsigned long flags;
1977 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1979 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1980 error = peer_ni->ibp_error;
1981 peer_ni->ibp_error = 0;
1983 last_alive = peer_ni->ibp_last_alive;
1986 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1989 lnet_notify(peer_ni->ibp_ni,
1990 peer_ni->ibp_nid, 0, last_alive);
1994 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1996 /* This just does the immediate housekeeping. 'error' is zero for a
1997 * normal shutdown which can happen only after the connection has been
1998 * established. If the connection is established, schedule the
1999 * connection to be finished off by the connd. Otherwise the connd is
2000 * already dealing with it (either to set it up or tear it down).
2001 * Caller holds kib_global_lock exclusively in irq context */
2002 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2004 unsigned long flags;
2006 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2008 if (error != 0 && conn->ibc_comms_error == 0)
2009 conn->ibc_comms_error = error;
2011 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
2012 return; /* already being handled */
2015 list_empty(&conn->ibc_tx_noops) &&
2016 list_empty(&conn->ibc_tx_queue) &&
2017 list_empty(&conn->ibc_tx_queue_rsrvd) &&
2018 list_empty(&conn->ibc_tx_queue_nocred) &&
2019 list_empty(&conn->ibc_active_txs)) {
2020 CDEBUG(D_NET, "closing conn to %s\n",
2021 libcfs_nid2str(peer_ni->ibp_nid));
2023 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
2024 libcfs_nid2str(peer_ni->ibp_nid), error,
2025 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
2026 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
2027 list_empty(&conn->ibc_tx_queue_rsrvd) ?
2028 "" : "(sending_rsrvd)",
2029 list_empty(&conn->ibc_tx_queue_nocred) ?
2030 "" : "(sending_nocred)",
2031 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
2034 dev = ((kib_net_t *)peer_ni->ibp_ni->ni_data)->ibn_dev;
2035 if (peer_ni->ibp_next_conn == conn)
2036 /* clear next_conn so it won't be used */
2037 peer_ni->ibp_next_conn = NULL;
2038 list_del(&conn->ibc_list);
2039 /* connd (see below) takes over ibc_list's ref */
2041 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
2042 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
2043 kiblnd_unlink_peer_locked(peer_ni);
2045 /* set/clear error on last conn */
2046 peer_ni->ibp_error = conn->ibc_comms_error;
2049 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
2052 kiblnd_dev_can_failover(dev)) {
2053 list_add_tail(&dev->ibd_fail_list,
2054 &kiblnd_data.kib_failed_devs);
2055 wake_up(&kiblnd_data.kib_failover_waitq);
2058 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2060 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2061 wake_up(&kiblnd_data.kib_connd_waitq);
2063 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2067 kiblnd_close_conn(kib_conn_t *conn, int error)
2069 unsigned long flags;
2071 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2073 kiblnd_close_conn_locked(conn, error);
2075 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2079 kiblnd_handle_early_rxs(kib_conn_t *conn)
2081 unsigned long flags;
2084 LASSERT(!in_interrupt());
2085 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2087 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2088 while (!list_empty(&conn->ibc_early_rxs)) {
2089 rx = list_entry(conn->ibc_early_rxs.next,
2091 list_del(&rx->rx_list);
2092 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2094 kiblnd_handle_rx(rx);
2096 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2098 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2102 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
2104 struct list_head zombies = LIST_HEAD_INIT(zombies);
2105 struct list_head *tmp;
2106 struct list_head *nxt;
2109 spin_lock(&conn->ibc_lock);
2111 list_for_each_safe(tmp, nxt, txs) {
2112 tx = list_entry(tmp, kib_tx_t, tx_list);
2114 if (txs == &conn->ibc_active_txs) {
2115 LASSERT(!tx->tx_queued);
2116 LASSERT(tx->tx_waiting ||
2117 tx->tx_sending != 0);
2119 LASSERT(tx->tx_queued);
2122 tx->tx_status = -ECONNABORTED;
2125 if (tx->tx_sending == 0) {
2127 list_del(&tx->tx_list);
2128 list_add(&tx->tx_list, &zombies);
2132 spin_unlock(&conn->ibc_lock);
2134 kiblnd_txlist_done(&zombies, -ECONNABORTED);
2138 kiblnd_finalise_conn (kib_conn_t *conn)
2140 LASSERT (!in_interrupt());
2141 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2143 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2145 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2146 * for connections that didn't get as far as being connected, because
2147 * rdma_disconnect() does this for free. */
2148 kiblnd_abort_receives(conn);
2150 /* Complete all tx descs not waiting for sends to complete.
2151 * NB we should be safe from RDMA now that the QP has changed state */
2153 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2154 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2155 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2156 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2157 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2159 kiblnd_handle_early_rxs(conn);
2163 kiblnd_peer_connect_failed(kib_peer_ni_t *peer_ni, int active, int error)
2165 struct list_head zombies = LIST_HEAD_INIT(zombies);
2166 unsigned long flags;
2168 LASSERT (error != 0);
2169 LASSERT (!in_interrupt());
2171 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2174 LASSERT(peer_ni->ibp_connecting > 0);
2175 peer_ni->ibp_connecting--;
2177 LASSERT (peer_ni->ibp_accepting > 0);
2178 peer_ni->ibp_accepting--;
2181 if (kiblnd_peer_connecting(peer_ni)) {
2182 /* another connection attempt under way... */
2183 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2188 peer_ni->ibp_reconnected = 0;
2189 if (list_empty(&peer_ni->ibp_conns)) {
2190 /* Take peer_ni's blocked transmits to complete with error */
2191 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2193 if (kiblnd_peer_active(peer_ni))
2194 kiblnd_unlink_peer_locked(peer_ni);
2196 peer_ni->ibp_error = error;
2198 /* Can't have blocked transmits if there are connections */
2199 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2202 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2204 kiblnd_peer_notify(peer_ni);
2206 if (list_empty(&zombies))
2209 CNETERR("Deleting messages for %s: connection failed\n",
2210 libcfs_nid2str(peer_ni->ibp_nid));
2212 kiblnd_txlist_done(&zombies, -EHOSTUNREACH);
2216 kiblnd_connreq_done(kib_conn_t *conn, int status)
2218 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2220 struct list_head txs;
2221 unsigned long flags;
2224 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2226 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2227 libcfs_nid2str(peer_ni->ibp_nid), active,
2228 conn->ibc_version, status);
2230 LASSERT (!in_interrupt());
2231 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2232 peer_ni->ibp_connecting > 0) ||
2233 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2234 peer_ni->ibp_accepting > 0));
2236 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2237 conn->ibc_connvars = NULL;
2240 /* failed to establish connection */
2241 kiblnd_peer_connect_failed(peer_ni, active, status);
2242 kiblnd_finalise_conn(conn);
2246 /* connection established */
2247 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2249 conn->ibc_last_send = ktime_get();
2250 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2251 kiblnd_peer_alive(peer_ni);
2253 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2254 * peer_ni instance... */
2255 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2256 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2257 peer_ni->ibp_reconnected = 0;
2259 peer_ni->ibp_connecting--;
2261 peer_ni->ibp_accepting--;
2263 if (peer_ni->ibp_version == 0) {
2264 peer_ni->ibp_version = conn->ibc_version;
2265 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2268 if (peer_ni->ibp_version != conn->ibc_version ||
2269 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2270 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2271 conn->ibc_incarnation);
2272 peer_ni->ibp_version = conn->ibc_version;
2273 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2276 /* grab pending txs while I have the lock */
2277 INIT_LIST_HEAD(&txs);
2278 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2280 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2281 conn->ibc_comms_error != 0) { /* error has happened already */
2283 /* start to shut down connection */
2284 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2285 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2287 kiblnd_txlist_done(&txs, -ECONNABORTED);
2292 /* +1 ref for myself, this connection is visible to other threads
2293 * now, refcount of peer:ibp_conns can be released by connection
2294 * close from either a different thread, or the calling of
2295 * kiblnd_check_sends_locked() below. See bz21911 for details.
2297 kiblnd_conn_addref(conn);
2298 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2300 /* Schedule blocked txs
2301 * Note: if we are running with conns_per_peer > 1, these blocked
2302 * txs will all get scheduled to the first connection which gets
2303 * scheduled. We won't be using round robin on this first batch.
2305 spin_lock(&conn->ibc_lock);
2306 while (!list_empty(&txs)) {
2307 tx = list_entry(txs.next, kib_tx_t, tx_list);
2308 list_del(&tx->tx_list);
2310 kiblnd_queue_tx_locked(tx, conn);
2312 kiblnd_check_sends_locked(conn);
2313 spin_unlock(&conn->ibc_lock);
2315 /* schedule blocked rxs */
2316 kiblnd_handle_early_rxs(conn);
2317 kiblnd_conn_decref(conn);
2321 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2325 rc = rdma_reject(cmid, rej, sizeof(*rej));
2328 CWARN("Error %d sending reject\n", rc);
2332 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2334 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2335 kib_msg_t *reqmsg = priv;
2338 kib_peer_ni_t *peer_ni;
2339 kib_peer_ni_t *peer2;
2341 struct lnet_ni *ni = NULL;
2342 kib_net_t *net = NULL;
2344 struct rdma_conn_param cp;
2346 int version = IBLND_MSG_VERSION;
2347 unsigned long flags;
2349 struct sockaddr_in *peer_addr;
2350 LASSERT (!in_interrupt());
2352 /* cmid inherits 'context' from the corresponding listener id */
2353 ibdev = (kib_dev_t *)cmid->context;
2354 LASSERT (ibdev != NULL);
2356 memset(&rej, 0, sizeof(rej));
2357 rej.ibr_magic = IBLND_MSG_MAGIC;
2358 rej.ibr_why = IBLND_REJECT_FATAL;
2359 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2361 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2362 if (*kiblnd_tunables.kib_require_priv_port &&
2363 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2364 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2365 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2366 &ip, ntohs(peer_addr->sin_port));
2370 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2371 CERROR("Short connection request\n");
2375 /* Future protocol version compatibility support! If the
2376 * o2iblnd-specific protocol changes, or when LNET unifies
2377 * protocols over all LNDs, the initial connection will
2378 * negotiate a protocol version. I trap this here to avoid
2379 * console errors; the reject tells the peer_ni which protocol I
2381 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2382 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2384 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2385 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2386 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2388 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2389 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2390 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2393 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2395 CERROR("Can't parse connection request: %d\n", rc);
2399 nid = reqmsg->ibm_srcnid;
2400 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2403 net = (kib_net_t *)ni->ni_data;
2404 rej.ibr_incarnation = net->ibn_incarnation;
2407 if (ni == NULL || /* no matching net */
2408 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2409 net->ibn_dev != ibdev) { /* wrong device */
2410 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2411 "bad dst nid %s\n", libcfs_nid2str(nid),
2412 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2413 ibdev->ibd_ifname, ibdev->ibd_nnets,
2415 libcfs_nid2str(reqmsg->ibm_dstnid));
2420 /* check time stamp as soon as possible */
2421 if (reqmsg->ibm_dststamp != 0 &&
2422 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2423 CWARN("Stale connection request\n");
2424 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2428 /* I can accept peer_ni's version */
2429 version = reqmsg->ibm_version;
2431 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2432 CERROR("Unexpected connreq msg type: %x from %s\n",
2433 reqmsg->ibm_type, libcfs_nid2str(nid));
2437 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2438 kiblnd_msg_queue_size(version, ni)) {
2439 CERROR("Can't accept conn from %s, queue depth too large: "
2440 " %d (<=%d wanted)\n",
2441 libcfs_nid2str(nid),
2442 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2443 kiblnd_msg_queue_size(version, ni));
2445 if (version == IBLND_MSG_VERSION)
2446 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2451 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2452 IBLND_MAX_RDMA_FRAGS) {
2453 CWARN("Can't accept conn from %s (version %x): "
2454 "max_frags %d too large (%d wanted)\n",
2455 libcfs_nid2str(nid), version,
2456 reqmsg->ibm_u.connparams.ibcp_max_frags,
2457 IBLND_MAX_RDMA_FRAGS);
2459 if (version >= IBLND_MSG_VERSION)
2460 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2463 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2464 IBLND_MAX_RDMA_FRAGS &&
2465 net->ibn_fmr_ps == NULL) {
2466 CWARN("Can't accept conn from %s (version %x): "
2467 "max_frags %d incompatible without FMR pool "
2469 libcfs_nid2str(nid), version,
2470 reqmsg->ibm_u.connparams.ibcp_max_frags,
2471 IBLND_MAX_RDMA_FRAGS);
2473 if (version == IBLND_MSG_VERSION)
2474 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2479 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2480 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2481 libcfs_nid2str(nid),
2482 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2487 /* assume 'nid' is a new peer_ni; create */
2488 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2490 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2491 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2495 /* We have validated the peer's parameters so use those */
2496 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2497 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2499 write_lock_irqsave(g_lock, flags);
2501 peer2 = kiblnd_find_peer_locked(ni, nid);
2502 if (peer2 != NULL) {
2503 if (peer2->ibp_version == 0) {
2504 peer2->ibp_version = version;
2505 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2508 /* not the guy I've talked with */
2509 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2510 peer2->ibp_version != version) {
2511 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2513 if (kiblnd_peer_active(peer2)) {
2514 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2515 peer2->ibp_version = version;
2517 write_unlock_irqrestore(g_lock, flags);
2519 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2520 libcfs_nid2str(nid), peer2->ibp_version, version,
2521 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2523 kiblnd_peer_decref(peer_ni);
2524 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2528 /* Tie-break connection race in favour of the higher NID.
2529 * If we keep running into a race condition multiple times,
2530 * we have to assume that the connection attempt with the
2531 * higher NID is stuck in a connecting state and will never
2532 * recover. As such, we pass through this if-block and let
2533 * the lower NID connection win so we can move forward.
2535 if (peer2->ibp_connecting != 0 &&
2536 nid < ni->ni_nid && peer2->ibp_races <
2537 MAX_CONN_RACES_BEFORE_ABORT) {
2539 write_unlock_irqrestore(g_lock, flags);
2541 CDEBUG(D_NET, "Conn race %s\n",
2542 libcfs_nid2str(peer2->ibp_nid));
2544 kiblnd_peer_decref(peer_ni);
2545 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2548 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2549 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2550 libcfs_nid2str(peer2->ibp_nid),
2551 MAX_CONN_RACES_BEFORE_ABORT);
2553 * passive connection is allowed even this peer_ni is waiting for
2556 peer2->ibp_reconnecting = 0;
2557 peer2->ibp_races = 0;
2558 peer2->ibp_accepting++;
2559 kiblnd_peer_addref(peer2);
2561 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2562 * so copy validated parameters since we now know what the
2563 * peer_ni's limits are */
2564 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2565 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2567 write_unlock_irqrestore(g_lock, flags);
2568 kiblnd_peer_decref(peer_ni);
2571 /* Brand new peer_ni */
2572 LASSERT (peer_ni->ibp_accepting == 0);
2573 LASSERT (peer_ni->ibp_version == 0 &&
2574 peer_ni->ibp_incarnation == 0);
2576 peer_ni->ibp_accepting = 1;
2577 peer_ni->ibp_version = version;
2578 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2580 /* I have a ref on ni that prevents it being shutdown */
2581 LASSERT (net->ibn_shutdown == 0);
2583 kiblnd_peer_addref(peer_ni);
2584 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2586 write_unlock_irqrestore(g_lock, flags);
2589 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2591 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2592 kiblnd_peer_decref(peer_ni);
2593 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2597 /* conn now "owns" cmid, so I return success from here on to ensure the
2598 * CM callback doesn't destroy cmid. */
2599 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2600 conn->ibc_credits = conn->ibc_queue_depth;
2601 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2602 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2603 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2605 ackmsg = &conn->ibc_connvars->cv_msg;
2606 memset(ackmsg, 0, sizeof(*ackmsg));
2608 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2609 sizeof(ackmsg->ibm_u.connparams));
2610 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2611 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2612 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2614 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2616 memset(&cp, 0, sizeof(cp));
2617 cp.private_data = ackmsg;
2618 cp.private_data_len = ackmsg->ibm_nob;
2619 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2620 cp.initiator_depth = 0;
2621 cp.flow_control = 1;
2622 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2623 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2625 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2627 rc = rdma_accept(cmid, &cp);
2629 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2630 rej.ibr_version = version;
2631 rej.ibr_why = IBLND_REJECT_FATAL;
2633 kiblnd_reject(cmid, &rej);
2634 kiblnd_connreq_done(conn, rc);
2635 kiblnd_conn_decref(conn);
2643 rej.ibr_cp.ibcp_queue_depth =
2644 kiblnd_msg_queue_size(version, ni);
2645 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2649 rej.ibr_version = version;
2650 kiblnd_reject(cmid, &rej);
2652 return -ECONNREFUSED;
2656 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2657 __u64 incarnation, int why, kib_connparams_t *cp)
2659 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2660 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2662 int msg_size = IBLND_MSG_SIZE;
2666 unsigned long flags;
2668 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2669 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2672 msg_size = cp->ibcp_max_msg_size;
2673 frag_num = cp->ibcp_max_frags;
2674 queue_dep = cp->ibcp_queue_depth;
2677 write_lock_irqsave(glock, flags);
2678 /* retry connection if it's still needed and no other connection
2679 * attempts (active or passive) are in progress
2680 * NB: reconnect is still needed even when ibp_tx_queue is
2681 * empty if ibp_version != version because reconnect may be
2682 * initiated by kiblnd_query() */
2683 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2684 peer_ni->ibp_version != version) &&
2685 peer_ni->ibp_connecting &&
2686 peer_ni->ibp_accepting == 0;
2697 case IBLND_REJECT_RDMA_FRAGS: {
2698 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2701 reason = "can't negotiate max frags";
2704 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2705 #ifdef HAVE_IB_GET_DMA_MR
2707 * This check only makes sense if the kernel supports global
2708 * memory registration. Otherwise, map_on_demand will never == 0
2710 if (!tunables->lnd_map_on_demand) {
2711 reason = "map_on_demand must be enabled";
2715 if (conn->ibc_max_frags <= frag_num) {
2716 reason = "unsupported max frags";
2720 peer_ni->ibp_max_frags = frag_num;
2721 reason = "rdma fragments";
2724 case IBLND_REJECT_MSG_QUEUE_SIZE:
2726 reason = "can't negotiate queue depth";
2729 if (conn->ibc_queue_depth <= queue_dep) {
2730 reason = "unsupported queue depth";
2734 peer_ni->ibp_queue_depth = queue_dep;
2735 reason = "queue depth";
2738 case IBLND_REJECT_CONN_STALE:
2742 case IBLND_REJECT_CONN_RACE:
2743 reason = "conn race";
2746 case IBLND_REJECT_CONN_UNCOMPAT:
2747 reason = "version negotiation";
2750 case IBLND_REJECT_INVALID_SRV_ID:
2751 reason = "invalid service id";
2755 conn->ibc_reconnect = 1;
2756 peer_ni->ibp_reconnecting++;
2757 peer_ni->ibp_version = version;
2758 if (incarnation != 0)
2759 peer_ni->ibp_incarnation = incarnation;
2761 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2763 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2764 libcfs_nid2str(peer_ni->ibp_nid),
2765 reconnect ? "reconnect" : "don't reconnect",
2766 reason, IBLND_MSG_VERSION, version, msg_size,
2767 conn->ibc_queue_depth, queue_dep,
2768 conn->ibc_max_frags, frag_num);
2770 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2771 * while destroying the zombie
2776 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2778 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2780 LASSERT (!in_interrupt());
2781 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2784 case IB_CM_REJ_STALE_CONN:
2785 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2786 IBLND_REJECT_CONN_STALE, NULL);
2789 case IB_CM_REJ_INVALID_SERVICE_ID:
2790 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2791 IBLND_REJECT_INVALID_SRV_ID, NULL);
2792 CNETERR("%s rejected: no listener at %d\n",
2793 libcfs_nid2str(peer_ni->ibp_nid),
2794 *kiblnd_tunables.kib_service);
2797 case IB_CM_REJ_CONSUMER_DEFINED:
2798 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2799 kib_rej_t *rej = priv;
2800 kib_connparams_t *cp = NULL;
2802 __u64 incarnation = -1;
2804 /* NB. default incarnation is -1 because:
2805 * a) V1 will ignore dst incarnation in connreq.
2806 * b) V2 will provide incarnation while rejecting me,
2807 * -1 will be overwrote.
2809 * if I try to connect to a V1 peer_ni with V2 protocol,
2810 * it rejected me then upgrade to V2, I have no idea
2811 * about the upgrading and try to reconnect with V1,
2812 * in this case upgraded V2 can find out I'm trying to
2813 * talk to the old guy and reject me(incarnation is -1).
2816 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2817 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2818 __swab32s(&rej->ibr_magic);
2819 __swab16s(&rej->ibr_version);
2823 if (priv_nob >= sizeof(kib_rej_t) &&
2824 rej->ibr_version > IBLND_MSG_VERSION_1) {
2825 /* priv_nob is always 148 in current version
2826 * of OFED, so we still need to check version.
2827 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2831 __swab64s(&rej->ibr_incarnation);
2832 __swab16s(&cp->ibcp_queue_depth);
2833 __swab16s(&cp->ibcp_max_frags);
2834 __swab32s(&cp->ibcp_max_msg_size);
2837 incarnation = rej->ibr_incarnation;
2840 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2841 rej->ibr_magic != LNET_PROTO_MAGIC) {
2842 CERROR("%s rejected: consumer defined fatal error\n",
2843 libcfs_nid2str(peer_ni->ibp_nid));
2847 if (rej->ibr_version != IBLND_MSG_VERSION &&
2848 rej->ibr_version != IBLND_MSG_VERSION_1) {
2849 CERROR("%s rejected: o2iblnd version %x error\n",
2850 libcfs_nid2str(peer_ni->ibp_nid),
2855 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2856 rej->ibr_version == IBLND_MSG_VERSION_1) {
2857 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2858 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2860 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2861 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2864 switch (rej->ibr_why) {
2865 case IBLND_REJECT_CONN_RACE:
2866 case IBLND_REJECT_CONN_STALE:
2867 case IBLND_REJECT_CONN_UNCOMPAT:
2868 case IBLND_REJECT_MSG_QUEUE_SIZE:
2869 case IBLND_REJECT_RDMA_FRAGS:
2870 kiblnd_check_reconnect(conn, rej->ibr_version,
2871 incarnation, rej->ibr_why, cp);
2874 case IBLND_REJECT_NO_RESOURCES:
2875 CERROR("%s rejected: o2iblnd no resources\n",
2876 libcfs_nid2str(peer_ni->ibp_nid));
2879 case IBLND_REJECT_FATAL:
2880 CERROR("%s rejected: o2iblnd fatal error\n",
2881 libcfs_nid2str(peer_ni->ibp_nid));
2885 CERROR("%s rejected: o2iblnd reason %d\n",
2886 libcfs_nid2str(peer_ni->ibp_nid),
2894 CNETERR("%s rejected: reason %d, size %d\n",
2895 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2899 kiblnd_connreq_done(conn, -ECONNREFUSED);
2903 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2905 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2906 struct lnet_ni *ni = peer_ni->ibp_ni;
2907 kib_net_t *net = ni->ni_data;
2908 kib_msg_t *msg = priv;
2909 int ver = conn->ibc_version;
2910 int rc = kiblnd_unpack_msg(msg, priv_nob);
2911 unsigned long flags;
2913 LASSERT (net != NULL);
2916 CERROR("Can't unpack connack from %s: %d\n",
2917 libcfs_nid2str(peer_ni->ibp_nid), rc);
2921 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2922 CERROR("Unexpected message %d from %s\n",
2923 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2928 if (ver != msg->ibm_version) {
2929 CERROR("%s replied version %x is different with "
2930 "requested version %x\n",
2931 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2936 if (msg->ibm_u.connparams.ibcp_queue_depth >
2937 conn->ibc_queue_depth) {
2938 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2939 libcfs_nid2str(peer_ni->ibp_nid),
2940 msg->ibm_u.connparams.ibcp_queue_depth,
2941 conn->ibc_queue_depth);
2946 if (msg->ibm_u.connparams.ibcp_max_frags >
2947 conn->ibc_max_frags) {
2948 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2949 libcfs_nid2str(peer_ni->ibp_nid),
2950 msg->ibm_u.connparams.ibcp_max_frags,
2951 conn->ibc_max_frags);
2956 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2957 CERROR("%s max message size %d too big (%d max)\n",
2958 libcfs_nid2str(peer_ni->ibp_nid),
2959 msg->ibm_u.connparams.ibcp_max_msg_size,
2965 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2966 if (msg->ibm_dstnid == ni->ni_nid &&
2967 msg->ibm_dststamp == net->ibn_incarnation)
2971 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2974 CERROR("Bad connection reply from %s, rc = %d, "
2975 "version: %x max_frags: %d\n",
2976 libcfs_nid2str(peer_ni->ibp_nid), rc,
2977 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2981 conn->ibc_incarnation = msg->ibm_srcstamp;
2982 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2983 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2984 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2985 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2986 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2987 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2989 kiblnd_connreq_done(conn, 0);
2993 /* NB My QP has already established itself, so I handle anything going
2994 * wrong here by setting ibc_comms_error.
2995 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2996 * immediately tears it down. */
2999 conn->ibc_comms_error = rc;
3000 kiblnd_connreq_done(conn, 0);
3004 kiblnd_active_connect (struct rdma_cm_id *cmid)
3006 kib_peer_ni_t *peer_ni = (kib_peer_ni_t *)cmid->context;
3009 struct rdma_conn_param cp;
3012 unsigned long flags;
3015 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3017 incarnation = peer_ni->ibp_incarnation;
3018 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
3019 peer_ni->ibp_version;
3021 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3023 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3026 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3027 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3031 /* conn "owns" cmid now, so I return success from here on to ensure the
3032 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3035 msg = &conn->ibc_connvars->cv_msg;
3037 memset(msg, 0, sizeof(*msg));
3038 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3039 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3040 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3041 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3043 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3044 0, peer_ni->ibp_nid, incarnation);
3046 memset(&cp, 0, sizeof(cp));
3047 cp.private_data = msg;
3048 cp.private_data_len = msg->ibm_nob;
3049 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3050 cp.initiator_depth = 0;
3051 cp.flow_control = 1;
3052 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3053 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3055 LASSERT(cmid->context == (void *)conn);
3056 LASSERT(conn->ibc_cmid == cmid);
3058 rc = rdma_connect(cmid, &cp);
3060 CERROR("Can't connect to %s: %d\n",
3061 libcfs_nid2str(peer_ni->ibp_nid), rc);
3062 kiblnd_connreq_done(conn, rc);
3063 kiblnd_conn_decref(conn);
3070 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3072 kib_peer_ni_t *peer_ni;
3076 switch (event->event) {
3078 CERROR("Unexpected event: %d, status: %d\n",
3079 event->event, event->status);
3082 case RDMA_CM_EVENT_CONNECT_REQUEST:
3083 /* destroy cmid on failure */
3084 rc = kiblnd_passive_connect(cmid,
3085 (void *)KIBLND_CONN_PARAM(event),
3086 KIBLND_CONN_PARAM_LEN(event));
3087 CDEBUG(D_NET, "connreq: %d\n", rc);
3090 case RDMA_CM_EVENT_ADDR_ERROR:
3091 peer_ni = (kib_peer_ni_t *)cmid->context;
3092 CNETERR("%s: ADDR ERROR %d\n",
3093 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3094 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3095 kiblnd_peer_decref(peer_ni);
3096 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3098 case RDMA_CM_EVENT_ADDR_RESOLVED:
3099 peer_ni = (kib_peer_ni_t *)cmid->context;
3101 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3102 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3104 if (event->status != 0) {
3105 CNETERR("Can't resolve address for %s: %d\n",
3106 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3109 rc = rdma_resolve_route(
3110 cmid, *kiblnd_tunables.kib_timeout * 1000);
3112 kib_net_t *net = peer_ni->ibp_ni->ni_data;
3113 kib_dev_t *dev = net->ibn_dev;
3115 CDEBUG(D_NET, "%s: connection bound to "\
3117 libcfs_nid2str(peer_ni->ibp_nid),
3119 &dev->ibd_ifip, cmid->device->name);
3124 /* Can't initiate route resolution */
3125 CERROR("Can't resolve route for %s: %d\n",
3126 libcfs_nid2str(peer_ni->ibp_nid), rc);
3128 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3129 kiblnd_peer_decref(peer_ni);
3130 return rc; /* rc != 0 destroys cmid */
3132 case RDMA_CM_EVENT_ROUTE_ERROR:
3133 peer_ni = (kib_peer_ni_t *)cmid->context;
3134 CNETERR("%s: ROUTE ERROR %d\n",
3135 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3136 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3137 kiblnd_peer_decref(peer_ni);
3138 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3140 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3141 peer_ni = (kib_peer_ni_t *)cmid->context;
3142 CDEBUG(D_NET,"%s Route resolved: %d\n",
3143 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3145 if (event->status == 0)
3146 return kiblnd_active_connect(cmid);
3148 CNETERR("Can't resolve route for %s: %d\n",
3149 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3150 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3151 kiblnd_peer_decref(peer_ni);
3152 return event->status; /* rc != 0 destroys cmid */
3154 case RDMA_CM_EVENT_UNREACHABLE:
3155 conn = (kib_conn_t *)cmid->context;
3156 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3157 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3158 CNETERR("%s: UNREACHABLE %d\n",
3159 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3160 kiblnd_connreq_done(conn, -ENETDOWN);
3161 kiblnd_conn_decref(conn);
3164 case RDMA_CM_EVENT_CONNECT_ERROR:
3165 conn = (kib_conn_t *)cmid->context;
3166 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3167 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3168 CNETERR("%s: CONNECT ERROR %d\n",
3169 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3170 kiblnd_connreq_done(conn, -ENOTCONN);
3171 kiblnd_conn_decref(conn);
3174 case RDMA_CM_EVENT_REJECTED:
3175 conn = (kib_conn_t *)cmid->context;
3176 switch (conn->ibc_state) {
3180 case IBLND_CONN_PASSIVE_WAIT:
3181 CERROR ("%s: REJECTED %d\n",
3182 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3184 kiblnd_connreq_done(conn, -ECONNRESET);
3187 case IBLND_CONN_ACTIVE_CONNECT:
3188 kiblnd_rejected(conn, event->status,
3189 (void *)KIBLND_CONN_PARAM(event),
3190 KIBLND_CONN_PARAM_LEN(event));
3193 kiblnd_conn_decref(conn);
3196 case RDMA_CM_EVENT_ESTABLISHED:
3197 conn = (kib_conn_t *)cmid->context;
3198 switch (conn->ibc_state) {
3202 case IBLND_CONN_PASSIVE_WAIT:
3203 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3204 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3205 kiblnd_connreq_done(conn, 0);
3208 case IBLND_CONN_ACTIVE_CONNECT:
3209 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3210 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3211 kiblnd_check_connreply(conn,
3212 (void *)KIBLND_CONN_PARAM(event),
3213 KIBLND_CONN_PARAM_LEN(event));
3216 /* net keeps its ref on conn! */
3219 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3220 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3223 case RDMA_CM_EVENT_DISCONNECTED:
3224 conn = (kib_conn_t *)cmid->context;
3225 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3226 CERROR("%s DISCONNECTED\n",
3227 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3228 kiblnd_connreq_done(conn, -ECONNRESET);
3230 kiblnd_close_conn(conn, 0);
3232 kiblnd_conn_decref(conn);
3233 cmid->context = NULL;
3236 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3237 LCONSOLE_ERROR_MSG(0x131,
3238 "Received notification of device removal\n"
3239 "Please shutdown LNET to allow this to proceed\n");
3240 /* Can't remove network from underneath LNET for now, so I have
3244 case RDMA_CM_EVENT_ADDR_CHANGE:
3245 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3251 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3254 struct list_head *ttmp;
3256 list_for_each(ttmp, txs) {
3257 tx = list_entry(ttmp, kib_tx_t, tx_list);
3259 if (txs != &conn->ibc_active_txs) {
3260 LASSERT(tx->tx_queued);
3262 LASSERT(!tx->tx_queued);
3263 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3266 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3267 CERROR("Timed out tx: %s, %lld seconds\n",
3268 kiblnd_queue2str(conn, txs),
3269 ktime_ms_delta(ktime_get(),
3270 tx->tx_deadline) / MSEC_PER_SEC);
3279 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3281 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3282 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3283 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3284 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3285 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3289 kiblnd_check_conns (int idx)
3291 struct list_head closes = LIST_HEAD_INIT(closes);
3292 struct list_head checksends = LIST_HEAD_INIT(checksends);
3293 struct list_head timedout_txs = LIST_HEAD_INIT(timedout_txs);
3294 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3295 struct list_head *ptmp;
3296 kib_peer_ni_t *peer_ni;
3298 kib_tx_t *tx, *tx_tmp;
3299 struct list_head *ctmp;
3300 unsigned long flags;
3302 /* NB. We expect to have a look at all the peers and not find any
3303 * RDMAs to time out, so we just use a shared lock while we
3305 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3307 list_for_each(ptmp, peers) {
3308 peer_ni = list_entry(ptmp, kib_peer_ni_t, ibp_list);
3310 /* Check tx_deadline */
3311 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3312 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3313 CWARN("Timed out tx for %s: %lld seconds\n",
3314 libcfs_nid2str(peer_ni->ibp_nid),
3315 ktime_ms_delta(ktime_get(),
3316 tx->tx_deadline) / MSEC_PER_SEC);
3317 list_move(&tx->tx_list, &timedout_txs);
3321 list_for_each(ctmp, &peer_ni->ibp_conns) {
3325 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3327 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3329 spin_lock(&conn->ibc_lock);
3331 sendnoop = kiblnd_need_noop(conn);
3332 timedout = kiblnd_conn_timed_out_locked(conn);
3333 if (!sendnoop && !timedout) {
3334 spin_unlock(&conn->ibc_lock);
3339 CERROR("Timed out RDMA with %s (%lld): "
3340 "c: %u, oc: %u, rc: %u\n",
3341 libcfs_nid2str(peer_ni->ibp_nid),
3342 ktime_get_seconds() - peer_ni->ibp_last_alive,
3344 conn->ibc_outstanding_credits,
3345 conn->ibc_reserved_credits);
3346 list_add(&conn->ibc_connd_list, &closes);
3348 list_add(&conn->ibc_connd_list, &checksends);
3350 /* +ref for 'closes' or 'checksends' */
3351 kiblnd_conn_addref(conn);
3353 spin_unlock(&conn->ibc_lock);
3357 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3359 if (!list_empty(&timedout_txs))
3360 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT);
3362 /* Handle timeout by closing the whole
3363 * connection. We can only be sure RDMA activity
3364 * has ceased once the QP has been modified. */
3365 while (!list_empty(&closes)) {
3366 conn = list_entry(closes.next,
3367 kib_conn_t, ibc_connd_list);
3368 list_del(&conn->ibc_connd_list);
3369 kiblnd_close_conn(conn, -ETIMEDOUT);
3370 kiblnd_conn_decref(conn);
3373 /* In case we have enough credits to return via a
3374 * NOOP, but there were no non-blocking tx descs
3375 * free to do it last time... */
3376 while (!list_empty(&checksends)) {
3377 conn = list_entry(checksends.next,
3378 kib_conn_t, ibc_connd_list);
3379 list_del(&conn->ibc_connd_list);
3381 spin_lock(&conn->ibc_lock);
3382 kiblnd_check_sends_locked(conn);
3383 spin_unlock(&conn->ibc_lock);
3385 kiblnd_conn_decref(conn);
3390 kiblnd_disconnect_conn (kib_conn_t *conn)
3392 LASSERT (!in_interrupt());
3393 LASSERT (current == kiblnd_data.kib_connd);
3394 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3396 rdma_disconnect(conn->ibc_cmid);
3397 kiblnd_finalise_conn(conn);
3399 kiblnd_peer_notify(conn->ibc_peer);
3403 * High-water for reconnection to the same peer_ni, reconnection attempt should
3404 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3406 #define KIB_RECONN_HIGH_RACE 10
3408 * Allow connd to take a break and handle other things after consecutive
3409 * reconnection attemps.
3411 #define KIB_RECONN_BREAK 100
3414 kiblnd_connd (void *arg)
3416 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3417 wait_queue_entry_t wait;
3418 unsigned long flags;
3424 unsigned long deadline = jiffies;
3426 cfs_block_allsigs();
3428 init_waitqueue_entry(&wait, current);
3429 kiblnd_data.kib_connd = current;
3431 spin_lock_irqsave(lock, flags);
3433 while (!kiblnd_data.kib_shutdown) {
3438 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3439 kib_peer_ni_t *peer_ni = NULL;
3441 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3442 kib_conn_t, ibc_list);
3443 list_del(&conn->ibc_list);
3444 if (conn->ibc_reconnect) {
3445 peer_ni = conn->ibc_peer;
3446 kiblnd_peer_addref(peer_ni);
3449 spin_unlock_irqrestore(lock, flags);
3452 kiblnd_destroy_conn(conn);
3454 spin_lock_irqsave(lock, flags);
3456 LIBCFS_FREE(conn, sizeof(*conn));
3460 conn->ibc_peer = peer_ni;
3461 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3462 list_add_tail(&conn->ibc_list,
3463 &kiblnd_data.kib_reconn_list);
3465 list_add_tail(&conn->ibc_list,
3466 &kiblnd_data.kib_reconn_wait);
3469 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3470 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3471 kib_conn_t, ibc_list);
3472 list_del(&conn->ibc_list);
3474 spin_unlock_irqrestore(lock, flags);
3477 kiblnd_disconnect_conn(conn);
3478 kiblnd_conn_decref(conn);
3480 spin_lock_irqsave(lock, flags);
3483 while (reconn < KIB_RECONN_BREAK) {
3484 if (kiblnd_data.kib_reconn_sec !=
3485 ktime_get_real_seconds()) {
3486 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3487 list_splice_init(&kiblnd_data.kib_reconn_wait,
3488 &kiblnd_data.kib_reconn_list);
3491 if (list_empty(&kiblnd_data.kib_reconn_list))
3494 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3495 kib_conn_t, ibc_list);
3496 list_del(&conn->ibc_list);
3498 spin_unlock_irqrestore(lock, flags);
3501 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3502 kiblnd_peer_decref(conn->ibc_peer);
3503 LIBCFS_FREE(conn, sizeof(*conn));
3505 spin_lock_irqsave(lock, flags);
3508 /* careful with the jiffy wrap... */
3509 timeout = (int)(deadline - jiffies);
3513 int chunk = kiblnd_data.kib_peer_hash_size;
3515 spin_unlock_irqrestore(lock, flags);
3518 /* Time to check for RDMA timeouts on a few more
3519 * peers: I do checks every 'p' seconds on a
3520 * proportion of the peer_ni table and I need to check
3521 * every connection 'n' times within a timeout
3522 * interval, to ensure I detect a timeout on any
3523 * connection within (n+1)/n times the timeout
3526 if (*kiblnd_tunables.kib_timeout > n * p)
3527 chunk = (chunk * n * p) /
3528 *kiblnd_tunables.kib_timeout;
3532 for (i = 0; i < chunk; i++) {
3533 kiblnd_check_conns(peer_index);
3534 peer_index = (peer_index + 1) %
3535 kiblnd_data.kib_peer_hash_size;
3538 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3539 spin_lock_irqsave(lock, flags);
3545 /* Nothing to do for 'timeout' */
3546 set_current_state(TASK_INTERRUPTIBLE);
3547 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3548 spin_unlock_irqrestore(lock, flags);
3550 schedule_timeout(timeout);
3552 set_current_state(TASK_RUNNING);
3553 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3554 spin_lock_irqsave(lock, flags);
3557 spin_unlock_irqrestore(lock, flags);
3559 kiblnd_thread_fini();
3564 kiblnd_qp_event(struct ib_event *event, void *arg)
3566 kib_conn_t *conn = arg;
3568 switch (event->event) {
3569 case IB_EVENT_COMM_EST:
3570 CDEBUG(D_NET, "%s established\n",
3571 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3572 /* We received a packet but connection isn't established
3573 * probably handshake packet was lost, so free to
3574 * force make connection established */
3575 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3579 CERROR("%s: Async QP event type %d\n",
3580 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3586 kiblnd_complete (struct ib_wc *wc)
3588 switch (kiblnd_wreqid2type(wc->wr_id)) {
3593 if (wc->status != IB_WC_SUCCESS &&
3594 wc->status != IB_WC_WR_FLUSH_ERR)
3595 CNETERR("FastReg failed: %d\n", wc->status);
3598 case IBLND_WID_RDMA:
3599 /* We only get RDMA completion notification if it fails. All
3600 * subsequent work items, including the final SEND will fail
3601 * too. However we can't print out any more info about the
3602 * failing RDMA because 'tx' might be back on the idle list or
3603 * even reused already if we didn't manage to post all our work
3605 CNETERR("RDMA (tx: %p) failed: %d\n",
3606 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3610 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3614 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3621 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3623 /* NB I'm not allowed to schedule this conn once its refcount has
3624 * reached 0. Since fundamentally I'm racing with scheduler threads
3625 * consuming my CQ I could be called after all completions have
3626 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3627 * and this CQ is about to be destroyed so I NOOP. */
3628 kib_conn_t *conn = (kib_conn_t *)arg;
3629 struct kib_sched_info *sched = conn->ibc_sched;
3630 unsigned long flags;
3632 LASSERT(cq == conn->ibc_cq);
3634 spin_lock_irqsave(&sched->ibs_lock, flags);
3636 conn->ibc_ready = 1;
3638 if (!conn->ibc_scheduled &&
3639 (conn->ibc_nrx > 0 ||
3640 conn->ibc_nsends_posted > 0)) {
3641 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3642 conn->ibc_scheduled = 1;
3643 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3645 if (waitqueue_active(&sched->ibs_waitq))
3646 wake_up(&sched->ibs_waitq);
3649 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3653 kiblnd_cq_event(struct ib_event *event, void *arg)
3655 kib_conn_t *conn = arg;
3657 CERROR("%s: async CQ event type %d\n",
3658 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3662 kiblnd_scheduler(void *arg)
3664 long id = (long)arg;
3665 struct kib_sched_info *sched;
3667 wait_queue_entry_t wait;
3668 unsigned long flags;
3674 cfs_block_allsigs();
3676 init_waitqueue_entry(&wait, current);
3678 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3680 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3682 CWARN("Unable to bind on CPU partition %d, please verify "
3683 "whether all CPUs are healthy and reload modules if "
3684 "necessary, otherwise your system might under risk of "
3685 "low performance\n", sched->ibs_cpt);
3688 spin_lock_irqsave(&sched->ibs_lock, flags);
3690 while (!kiblnd_data.kib_shutdown) {
3691 if (busy_loops++ >= IBLND_RESCHED) {
3692 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3697 spin_lock_irqsave(&sched->ibs_lock, flags);
3702 if (!list_empty(&sched->ibs_conns)) {
3703 conn = list_entry(sched->ibs_conns.next,
3704 kib_conn_t, ibc_sched_list);
3705 /* take over kib_sched_conns' ref on conn... */
3706 LASSERT(conn->ibc_scheduled);
3707 list_del(&conn->ibc_sched_list);
3708 conn->ibc_ready = 0;
3710 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3712 wc.wr_id = IBLND_WID_INVAL;
3714 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3716 rc = ib_req_notify_cq(conn->ibc_cq,
3719 CWARN("%s: ib_req_notify_cq failed: %d, "
3720 "closing connection\n",
3721 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3722 kiblnd_close_conn(conn, -EIO);
3723 kiblnd_conn_decref(conn);
3724 spin_lock_irqsave(&sched->ibs_lock,
3729 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3732 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3734 "ib_poll_cq (rc: %d) returned invalid "
3735 "wr_id, opcode %d, status: %d, "
3736 "vendor_err: %d, conn: %s status: %d\n"
3737 "please upgrade firmware and OFED or "
3738 "contact vendor.\n", rc,
3739 wc.opcode, wc.status, wc.vendor_err,
3740 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3746 CWARN("%s: ib_poll_cq failed: %d, "
3747 "closing connection\n",
3748 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3750 kiblnd_close_conn(conn, -EIO);
3751 kiblnd_conn_decref(conn);
3752 spin_lock_irqsave(&sched->ibs_lock, flags);
3756 spin_lock_irqsave(&sched->ibs_lock, flags);
3758 if (rc != 0 || conn->ibc_ready) {
3759 /* There may be another completion waiting; get
3760 * another scheduler to check while I handle
3762 /* +1 ref for sched_conns */
3763 kiblnd_conn_addref(conn);
3764 list_add_tail(&conn->ibc_sched_list,
3766 if (waitqueue_active(&sched->ibs_waitq))
3767 wake_up(&sched->ibs_waitq);
3769 conn->ibc_scheduled = 0;
3773 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3774 kiblnd_complete(&wc);
3776 spin_lock_irqsave(&sched->ibs_lock, flags);
3779 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3786 set_current_state(TASK_INTERRUPTIBLE);
3787 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3788 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3793 remove_wait_queue(&sched->ibs_waitq, &wait);
3794 set_current_state(TASK_RUNNING);
3795 spin_lock_irqsave(&sched->ibs_lock, flags);
3798 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3800 kiblnd_thread_fini();
3805 kiblnd_failover_thread(void *arg)
3807 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3809 wait_queue_entry_t wait;
3810 unsigned long flags;
3813 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3815 cfs_block_allsigs();
3817 init_waitqueue_entry(&wait, current);
3818 write_lock_irqsave(glock, flags);
3820 while (!kiblnd_data.kib_shutdown) {
3821 int do_failover = 0;
3824 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3826 if (ktime_get_seconds() < dev->ibd_next_failover)
3833 list_del_init(&dev->ibd_fail_list);
3834 dev->ibd_failover = 1;
3835 write_unlock_irqrestore(glock, flags);
3837 rc = kiblnd_dev_failover(dev);
3839 write_lock_irqsave(glock, flags);
3841 LASSERT (dev->ibd_failover);
3842 dev->ibd_failover = 0;
3843 if (rc >= 0) { /* Device is OK or failover succeed */
3844 dev->ibd_next_failover = ktime_get_seconds() + 3;
3848 /* failed to failover, retry later */
3849 dev->ibd_next_failover = ktime_get_seconds() +
3850 min(dev->ibd_failed_failover, 10);
3851 if (kiblnd_dev_can_failover(dev)) {
3852 list_add_tail(&dev->ibd_fail_list,
3853 &kiblnd_data.kib_failed_devs);
3859 /* long sleep if no more pending failover */
3860 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3862 set_current_state(TASK_INTERRUPTIBLE);
3863 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3864 write_unlock_irqrestore(glock, flags);
3866 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3867 cfs_time_seconds(1));
3868 set_current_state(TASK_RUNNING);
3869 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3870 write_lock_irqsave(glock, flags);
3872 if (!long_sleep || rc != 0)
3875 /* have a long sleep, routine check all active devices,
3876 * we need checking like this because if there is not active
3877 * connection on the dev and no SEND from local, we may listen
3878 * on wrong HCA for ever while there is a bonding failover */
3879 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3880 if (kiblnd_dev_can_failover(dev)) {
3881 list_add_tail(&dev->ibd_fail_list,
3882 &kiblnd_data.kib_failed_devs);
3887 write_unlock_irqrestore(glock, flags);
3889 kiblnd_thread_fini();