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;
730 LASSERT (net != NULL);
732 while (offset >= iov->iov_len) {
733 offset -= iov->iov_len;
743 vaddr = ((unsigned long)iov->iov_base) + offset;
744 page_offset = vaddr & (PAGE_SIZE - 1);
745 page = lnet_kvaddr_to_page(vaddr);
747 CERROR("Can't find page\n");
751 fragnob = min((int)(iov->iov_len - offset), nob);
752 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
754 if ((fragnob < (int)PAGE_SIZE - page_offset) && (niov > 1)) {
755 CDEBUG(D_NET, "fragnob %d < available page %d: with"
756 " remaining %d iovs\n",
757 fragnob, (int)PAGE_SIZE - page_offset, niov);
761 sg_set_page(sg, page, fragnob, page_offset);
764 CERROR("lacking enough sg entries to map tx\n");
768 if (offset + fragnob < iov->iov_len) {
778 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
782 kiblnd_setup_rd_kiov(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
783 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
785 kib_net_t *net = ni->ni_data;
786 struct scatterlist *sg;
789 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
793 LASSERT(net != NULL);
795 while (offset >= kiov->kiov_len) {
796 offset -= kiov->kiov_len;
806 fragnob = min((int)(kiov->kiov_len - offset), nob);
808 if ((fragnob < (int)(kiov->kiov_len - offset)) && nkiov > 1) {
809 CDEBUG(D_NET, "fragnob %d < available page %d: with"
810 " remaining %d kiovs\n",
811 fragnob, (int)(kiov->kiov_len - offset), nkiov);
815 sg_set_page(sg, kiov->kiov_page, fragnob,
816 kiov->kiov_offset + offset);
819 CERROR("lacking enough sg entries to map tx\n");
829 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
833 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
834 __must_hold(&conn->ibc_lock)
836 kib_msg_t *msg = tx->tx_msg;
837 kib_peer_ni_t *peer_ni = conn->ibc_peer;
838 int ver = conn->ibc_version;
842 LASSERT(tx->tx_queued);
843 /* We rely on this for QP sizing */
844 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
845 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
847 LASSERT(credit == 0 || credit == 1);
848 LASSERT(conn->ibc_outstanding_credits >= 0);
849 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
850 LASSERT(conn->ibc_credits >= 0);
851 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
853 if (conn->ibc_nsends_posted ==
854 conn->ibc_queue_depth) {
855 /* tx completions outstanding... */
856 CDEBUG(D_NET, "%s: posted enough\n",
857 libcfs_nid2str(peer_ni->ibp_nid));
861 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
862 CDEBUG(D_NET, "%s: no credits\n",
863 libcfs_nid2str(peer_ni->ibp_nid));
867 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
868 conn->ibc_credits == 1 && /* last credit reserved */
869 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
870 CDEBUG(D_NET, "%s: not using last credit\n",
871 libcfs_nid2str(peer_ni->ibp_nid));
875 /* NB don't drop ibc_lock before bumping tx_sending */
876 list_del(&tx->tx_list);
879 if (msg->ibm_type == IBLND_MSG_NOOP &&
880 (!kiblnd_need_noop(conn) || /* redundant NOOP */
881 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
882 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
883 /* OK to drop when posted enough NOOPs, since
884 * kiblnd_check_sends_locked will queue NOOP again when
885 * posted NOOPs complete */
886 spin_unlock(&conn->ibc_lock);
888 spin_lock(&conn->ibc_lock);
889 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
890 libcfs_nid2str(peer_ni->ibp_nid),
891 conn->ibc_noops_posted);
895 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
896 peer_ni->ibp_nid, conn->ibc_incarnation);
898 conn->ibc_credits -= credit;
899 conn->ibc_outstanding_credits = 0;
900 conn->ibc_nsends_posted++;
901 if (msg->ibm_type == IBLND_MSG_NOOP)
902 conn->ibc_noops_posted++;
904 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
905 * PUT. If so, it was first queued here as a PUT_REQ, sent and
906 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
907 * and then re-queued here. It's (just) possible that
908 * tx_sending is non-zero if we've not done the tx_complete()
909 * from the first send; hence the ++ rather than = below. */
911 list_add(&tx->tx_list, &conn->ibc_active_txs);
913 /* I'm still holding ibc_lock! */
914 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
916 } else if (tx->tx_pool->tpo_pool.po_failed ||
917 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
918 /* close_conn will launch failover */
921 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
922 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
923 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
926 if (!frd->frd_valid) {
927 wr = &frd->frd_inv_wr.wr;
928 wr->next = &frd->frd_fastreg_wr.wr;
930 wr = &frd->frd_fastreg_wr.wr;
932 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
935 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
936 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
937 bad->wr_id, bad->opcode, bad->send_flags,
938 libcfs_nid2str(conn->ibc_peer->ibp_nid));
941 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
944 conn->ibc_last_send = ktime_get();
949 /* NB credits are transferred in the actual
950 * message, which can only be the last work item */
951 conn->ibc_credits += credit;
952 conn->ibc_outstanding_credits += msg->ibm_credits;
953 conn->ibc_nsends_posted--;
954 if (msg->ibm_type == IBLND_MSG_NOOP)
955 conn->ibc_noops_posted--;
961 done = (tx->tx_sending == 0);
963 list_del(&tx->tx_list);
965 spin_unlock(&conn->ibc_lock);
967 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
968 CERROR("Error %d posting transmit to %s\n",
969 rc, libcfs_nid2str(peer_ni->ibp_nid));
971 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
972 rc, libcfs_nid2str(peer_ni->ibp_nid));
974 kiblnd_close_conn(conn, rc);
979 spin_lock(&conn->ibc_lock);
985 kiblnd_check_sends_locked(kib_conn_t *conn)
987 int ver = conn->ibc_version;
988 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
991 /* Don't send anything until after the connection is established */
992 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
993 CDEBUG(D_NET, "%s too soon\n",
994 libcfs_nid2str(conn->ibc_peer->ibp_nid));
998 LASSERT(conn->ibc_nsends_posted <=
999 conn->ibc_queue_depth);
1000 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
1001 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
1002 LASSERT (conn->ibc_reserved_credits >= 0);
1004 while (conn->ibc_reserved_credits > 0 &&
1005 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
1006 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
1008 list_del(&tx->tx_list);
1009 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
1010 conn->ibc_reserved_credits--;
1013 if (kiblnd_need_noop(conn)) {
1014 spin_unlock(&conn->ibc_lock);
1016 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1018 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
1020 spin_lock(&conn->ibc_lock);
1022 kiblnd_queue_tx_locked(tx, conn);
1028 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1030 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1032 } else if (!list_empty(&conn->ibc_tx_noops)) {
1033 LASSERT (!IBLND_OOB_CAPABLE(ver));
1035 tx = list_entry(conn->ibc_tx_noops.next,
1037 } else if (!list_empty(&conn->ibc_tx_queue)) {
1039 tx = list_entry(conn->ibc_tx_queue.next,
1044 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1050 kiblnd_tx_complete (kib_tx_t *tx, int status)
1052 int failed = (status != IB_WC_SUCCESS);
1053 kib_conn_t *conn = tx->tx_conn;
1056 LASSERT (tx->tx_sending > 0);
1059 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1060 CNETERR("Tx -> %s cookie %#llx"
1061 " sending %d waiting %d: failed %d\n",
1062 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1063 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1066 kiblnd_close_conn(conn, -EIO);
1068 kiblnd_peer_alive(conn->ibc_peer);
1071 spin_lock(&conn->ibc_lock);
1073 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1074 * gets to free it, which also drops its ref on 'conn'. */
1077 conn->ibc_nsends_posted--;
1078 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1079 conn->ibc_noops_posted--;
1082 tx->tx_waiting = 0; /* don't wait for peer_ni */
1083 tx->tx_status = -EIO;
1086 idle = (tx->tx_sending == 0) && /* This is the final callback */
1087 !tx->tx_waiting && /* Not waiting for peer_ni */
1088 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1090 list_del(&tx->tx_list);
1092 kiblnd_check_sends_locked(conn);
1093 spin_unlock(&conn->ibc_lock);
1100 kiblnd_init_tx_msg(struct lnet_ni *ni, kib_tx_t *tx, int type, int body_nob)
1102 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1103 struct ib_sge *sge = &tx->tx_msgsge;
1104 struct ib_rdma_wr *wrq;
1105 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1106 #ifdef HAVE_IB_GET_DMA_MR
1107 struct ib_mr *mr = hdev->ibh_mrs;
1110 LASSERT(tx->tx_nwrq >= 0);
1111 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1112 LASSERT(nob <= IBLND_MSG_SIZE);
1113 #ifdef HAVE_IB_GET_DMA_MR
1114 LASSERT(mr != NULL);
1117 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1119 #ifdef HAVE_IB_GET_DMA_MR
1120 sge->lkey = mr->lkey;
1122 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1124 sge->addr = tx->tx_msgaddr;
1127 wrq = &tx->tx_wrq[tx->tx_nwrq];
1128 memset(wrq, 0, sizeof(*wrq));
1130 wrq->wr.next = NULL;
1131 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1132 wrq->wr.sg_list = sge;
1133 wrq->wr.num_sge = 1;
1134 wrq->wr.opcode = IB_WR_SEND;
1135 wrq->wr.send_flags = IB_SEND_SIGNALED;
1141 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1142 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1144 kib_msg_t *ibmsg = tx->tx_msg;
1145 kib_rdma_desc_t *srcrd = tx->tx_rd;
1146 struct ib_rdma_wr *wrq = NULL;
1154 LASSERT(!in_interrupt());
1155 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1156 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1158 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1159 resid > 0; resid -= sge_nob) {
1162 if (srcidx >= srcrd->rd_nfrags) {
1163 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1168 if (dstidx >= dstrd->rd_nfrags) {
1169 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1174 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1175 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1176 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1177 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1178 conn->ibc_max_frags,
1179 srcidx, srcrd->rd_nfrags,
1180 dstidx, dstrd->rd_nfrags);
1185 sge_nob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1186 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1188 sge = &tx->tx_sge[tx->tx_nsge];
1189 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1190 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1191 sge->length = sge_nob;
1194 wrq = &tx->tx_wrq[tx->tx_nwrq];
1196 wrq->wr.next = &(wrq + 1)->wr;
1197 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1198 wrq->wr.sg_list = sge;
1199 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1200 wrq->wr.send_flags = 0;
1202 #ifdef HAVE_IB_RDMA_WR
1203 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1205 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1208 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1210 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1215 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1216 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1219 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1221 wrq->wr.num_sge = wrq_sge;
1227 if (rc < 0) /* no RDMA if completing with failure */
1228 tx->tx_nwrq = tx->tx_nsge = 0;
1230 ibmsg->ibm_u.completion.ibcm_status = rc;
1231 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1232 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1233 type, sizeof (kib_completion_msg_t));
1239 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1241 struct list_head *q;
1244 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1245 LASSERT(!tx->tx_queued); /* not queued for sending already */
1246 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1248 timeout_ns = *kiblnd_tunables.kib_timeout * NSEC_PER_SEC;
1250 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1252 if (tx->tx_conn == NULL) {
1253 kiblnd_conn_addref(conn);
1255 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1257 /* PUT_DONE first attached to conn as a PUT_REQ */
1258 LASSERT (tx->tx_conn == conn);
1259 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1262 switch (tx->tx_msg->ibm_type) {
1266 case IBLND_MSG_PUT_REQ:
1267 case IBLND_MSG_GET_REQ:
1268 q = &conn->ibc_tx_queue_rsrvd;
1271 case IBLND_MSG_PUT_NAK:
1272 case IBLND_MSG_PUT_ACK:
1273 case IBLND_MSG_PUT_DONE:
1274 case IBLND_MSG_GET_DONE:
1275 q = &conn->ibc_tx_queue_nocred;
1278 case IBLND_MSG_NOOP:
1279 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1280 q = &conn->ibc_tx_queue_nocred;
1282 q = &conn->ibc_tx_noops;
1285 case IBLND_MSG_IMMEDIATE:
1286 q = &conn->ibc_tx_queue;
1290 list_add_tail(&tx->tx_list, q);
1294 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1296 spin_lock(&conn->ibc_lock);
1297 kiblnd_queue_tx_locked(tx, conn);
1298 kiblnd_check_sends_locked(conn);
1299 spin_unlock(&conn->ibc_lock);
1302 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1303 struct sockaddr_in *srcaddr,
1304 struct sockaddr_in *dstaddr,
1307 unsigned short port;
1310 /* allow the port to be reused */
1311 rc = rdma_set_reuseaddr(cmid, 1);
1313 CERROR("Unable to set reuse on cmid: %d\n", rc);
1317 /* look for a free privileged port */
1318 for (port = PROT_SOCK-1; port > 0; port--) {
1319 srcaddr->sin_port = htons(port);
1320 rc = rdma_resolve_addr(cmid,
1321 (struct sockaddr *)srcaddr,
1322 (struct sockaddr *)dstaddr,
1325 CDEBUG(D_NET, "bound to port %hu\n", port);
1327 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1328 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1335 CERROR("Failed to bind to a free privileged port\n");
1340 kiblnd_connect_peer (kib_peer_ni_t *peer_ni)
1342 struct rdma_cm_id *cmid;
1344 kib_net_t *net = peer_ni->ibp_ni->ni_data;
1345 struct sockaddr_in srcaddr;
1346 struct sockaddr_in dstaddr;
1349 LASSERT (net != NULL);
1350 LASSERT (peer_ni->ibp_connecting > 0);
1352 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer_ni, RDMA_PS_TCP,
1356 CERROR("Can't create CMID for %s: %ld\n",
1357 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1363 memset(&srcaddr, 0, sizeof(srcaddr));
1364 srcaddr.sin_family = AF_INET;
1365 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1367 memset(&dstaddr, 0, sizeof(dstaddr));
1368 dstaddr.sin_family = AF_INET;
1369 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1370 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1372 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1374 if (*kiblnd_tunables.kib_use_priv_port) {
1375 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1376 *kiblnd_tunables.kib_timeout * 1000);
1378 rc = rdma_resolve_addr(cmid,
1379 (struct sockaddr *)&srcaddr,
1380 (struct sockaddr *)&dstaddr,
1381 *kiblnd_tunables.kib_timeout * 1000);
1384 /* Can't initiate address resolution: */
1385 CERROR("Can't resolve addr for %s: %d\n",
1386 libcfs_nid2str(peer_ni->ibp_nid), rc);
1393 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1394 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1395 rdma_destroy_id(cmid);
1398 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1402 kiblnd_reconnect_peer(kib_peer_ni_t *peer_ni)
1404 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1405 char *reason = NULL;
1406 struct list_head txs;
1407 unsigned long flags;
1409 INIT_LIST_HEAD(&txs);
1411 write_lock_irqsave(glock, flags);
1412 if (peer_ni->ibp_reconnecting == 0) {
1413 if (peer_ni->ibp_accepting)
1414 reason = "accepting";
1415 else if (peer_ni->ibp_connecting)
1416 reason = "connecting";
1417 else if (!list_empty(&peer_ni->ibp_conns))
1418 reason = "connected";
1419 else /* connected then closed */
1425 if (peer_ni->ibp_accepting)
1426 CNETERR("Detecting race between accepting and reconnecting\n");
1427 peer_ni->ibp_reconnecting--;
1429 if (!kiblnd_peer_active(peer_ni)) {
1430 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1431 reason = "unlinked";
1435 peer_ni->ibp_connecting++;
1436 peer_ni->ibp_reconnected++;
1438 write_unlock_irqrestore(glock, flags);
1440 kiblnd_connect_peer(peer_ni);
1444 write_unlock_irqrestore(glock, flags);
1446 CWARN("Abort reconnection of %s: %s\n",
1447 libcfs_nid2str(peer_ni->ibp_nid), reason);
1448 kiblnd_txlist_done(&txs, -ECONNABORTED);
1453 kiblnd_launch_tx(struct lnet_ni *ni, kib_tx_t *tx, lnet_nid_t nid)
1455 kib_peer_ni_t *peer_ni;
1456 kib_peer_ni_t *peer2;
1458 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1459 unsigned long flags;
1462 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1464 /* If I get here, I've committed to send, so I complete the tx with
1465 * failure on any problems */
1467 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1468 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1470 /* First time, just use a read lock since I expect to find my peer_ni
1472 read_lock_irqsave(g_lock, flags);
1474 peer_ni = kiblnd_find_peer_locked(ni, nid);
1475 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1476 /* Found a peer_ni with an established connection */
1477 conn = kiblnd_get_conn_locked(peer_ni);
1478 kiblnd_conn_addref(conn); /* 1 ref for me... */
1480 read_unlock_irqrestore(g_lock, flags);
1483 kiblnd_queue_tx(tx, conn);
1484 kiblnd_conn_decref(conn); /* ...to here */
1488 read_unlock(g_lock);
1489 /* Re-try with a write lock */
1492 peer_ni = kiblnd_find_peer_locked(ni, nid);
1493 if (peer_ni != NULL) {
1494 if (list_empty(&peer_ni->ibp_conns)) {
1495 /* found a peer_ni, but it's still connecting... */
1496 LASSERT(kiblnd_peer_connecting(peer_ni));
1498 list_add_tail(&tx->tx_list,
1499 &peer_ni->ibp_tx_queue);
1500 write_unlock_irqrestore(g_lock, flags);
1502 conn = kiblnd_get_conn_locked(peer_ni);
1503 kiblnd_conn_addref(conn); /* 1 ref for me... */
1505 write_unlock_irqrestore(g_lock, flags);
1508 kiblnd_queue_tx(tx, conn);
1509 kiblnd_conn_decref(conn); /* ...to here */
1514 write_unlock_irqrestore(g_lock, flags);
1516 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1517 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1519 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1521 tx->tx_status = -EHOSTUNREACH;
1528 write_lock_irqsave(g_lock, flags);
1530 peer2 = kiblnd_find_peer_locked(ni, nid);
1531 if (peer2 != NULL) {
1532 if (list_empty(&peer2->ibp_conns)) {
1533 /* found a peer_ni, but it's still connecting... */
1534 LASSERT(kiblnd_peer_connecting(peer2));
1536 list_add_tail(&tx->tx_list,
1537 &peer2->ibp_tx_queue);
1538 write_unlock_irqrestore(g_lock, flags);
1540 conn = kiblnd_get_conn_locked(peer2);
1541 kiblnd_conn_addref(conn); /* 1 ref for me... */
1543 write_unlock_irqrestore(g_lock, flags);
1546 kiblnd_queue_tx(tx, conn);
1547 kiblnd_conn_decref(conn); /* ...to here */
1550 kiblnd_peer_decref(peer_ni);
1554 /* Brand new peer_ni */
1555 LASSERT(peer_ni->ibp_connecting == 0);
1556 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1557 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1559 /* always called with a ref on ni, which prevents ni being shutdown */
1560 LASSERT(((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1563 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1565 kiblnd_peer_addref(peer_ni);
1566 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1568 write_unlock_irqrestore(g_lock, flags);
1570 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1571 kiblnd_connect_peer(peer_ni);
1572 kiblnd_peer_decref(peer_ni);
1576 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1578 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1579 int type = lntmsg->msg_type;
1580 struct lnet_process_id target = lntmsg->msg_target;
1581 int target_is_router = lntmsg->msg_target_is_router;
1582 int routing = lntmsg->msg_routing;
1583 unsigned int payload_niov = lntmsg->msg_niov;
1584 struct kvec *payload_iov = lntmsg->msg_iov;
1585 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1586 unsigned int payload_offset = lntmsg->msg_offset;
1587 unsigned int payload_nob = lntmsg->msg_len;
1589 kib_rdma_desc_t *rd;
1594 /* NB 'private' is different depending on what we're sending.... */
1596 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1597 payload_nob, payload_niov, libcfs_id2str(target));
1599 LASSERT (payload_nob == 0 || payload_niov > 0);
1600 LASSERT (payload_niov <= LNET_MAX_IOV);
1602 /* Thread context */
1603 LASSERT (!in_interrupt());
1604 /* payload is either all vaddrs or all pages */
1605 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1613 LASSERT (payload_nob == 0);
1617 if (routing || target_is_router)
1618 break; /* send IMMEDIATE */
1620 /* is the REPLY message too small for RDMA? */
1621 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1622 if (nob <= IBLND_MSG_SIZE)
1623 break; /* send IMMEDIATE */
1625 tx = kiblnd_get_idle_tx(ni, target.nid);
1627 CERROR("Can't allocate txd for GET to %s\n",
1628 libcfs_nid2str(target.nid));
1633 rd = &ibmsg->ibm_u.get.ibgm_rd;
1634 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1635 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1636 lntmsg->msg_md->md_niov,
1637 lntmsg->msg_md->md_iov.iov,
1638 0, lntmsg->msg_md->md_length);
1640 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1641 lntmsg->msg_md->md_niov,
1642 lntmsg->msg_md->md_iov.kiov,
1643 0, lntmsg->msg_md->md_length);
1645 CERROR("Can't setup GET sink for %s: %d\n",
1646 libcfs_nid2str(target.nid), rc);
1651 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1652 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1653 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1655 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1657 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1658 if (tx->tx_lntmsg[1] == NULL) {
1659 CERROR("Can't create reply for GET -> %s\n",
1660 libcfs_nid2str(target.nid));
1665 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1666 tx->tx_waiting = 1; /* waiting for GET_DONE */
1667 kiblnd_launch_tx(ni, tx, target.nid);
1670 case LNET_MSG_REPLY:
1672 /* Is the payload small enough not to need RDMA? */
1673 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1674 if (nob <= IBLND_MSG_SIZE)
1675 break; /* send IMMEDIATE */
1677 tx = kiblnd_get_idle_tx(ni, target.nid);
1679 CERROR("Can't allocate %s txd for %s\n",
1680 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1681 libcfs_nid2str(target.nid));
1685 if (payload_kiov == NULL)
1686 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1687 payload_niov, payload_iov,
1688 payload_offset, payload_nob);
1690 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1691 payload_niov, payload_kiov,
1692 payload_offset, payload_nob);
1694 CERROR("Can't setup PUT src for %s: %d\n",
1695 libcfs_nid2str(target.nid), rc);
1701 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1702 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1703 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1705 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1706 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1707 kiblnd_launch_tx(ni, tx, target.nid);
1711 /* send IMMEDIATE */
1713 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1716 tx = kiblnd_get_idle_tx(ni, target.nid);
1718 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1719 type, libcfs_nid2str(target.nid));
1724 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1726 if (payload_kiov != NULL)
1727 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1728 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1729 payload_niov, payload_kiov,
1730 payload_offset, payload_nob);
1732 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1733 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1734 payload_niov, payload_iov,
1735 payload_offset, payload_nob);
1737 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1738 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1740 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1741 kiblnd_launch_tx(ni, tx, target.nid);
1746 kiblnd_reply(struct lnet_ni *ni, kib_rx_t *rx, struct lnet_msg *lntmsg)
1748 struct lnet_process_id target = lntmsg->msg_target;
1749 unsigned int niov = lntmsg->msg_niov;
1750 struct kvec *iov = lntmsg->msg_iov;
1751 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1752 unsigned int offset = lntmsg->msg_offset;
1753 unsigned int nob = lntmsg->msg_len;
1757 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1759 CERROR("Can't get tx for REPLY to %s\n",
1760 libcfs_nid2str(target.nid));
1766 else if (kiov == NULL)
1767 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1768 niov, iov, offset, nob);
1770 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1771 niov, kiov, offset, nob);
1774 CERROR("Can't setup GET src for %s: %d\n",
1775 libcfs_nid2str(target.nid), rc);
1779 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1780 IBLND_MSG_GET_DONE, nob,
1781 &rx->rx_msg->ibm_u.get.ibgm_rd,
1782 rx->rx_msg->ibm_u.get.ibgm_cookie);
1784 CERROR("Can't setup rdma for GET from %s: %d\n",
1785 libcfs_nid2str(target.nid), rc);
1790 /* No RDMA: local completion may happen now! */
1791 lnet_finalize(lntmsg, 0);
1793 /* RDMA: lnet_finalize(lntmsg) when it
1795 tx->tx_lntmsg[0] = lntmsg;
1798 kiblnd_queue_tx(tx, rx->rx_conn);
1804 lnet_finalize(lntmsg, -EIO);
1808 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1809 int delayed, unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1810 unsigned int offset, unsigned int mlen, unsigned int rlen)
1812 kib_rx_t *rx = private;
1813 kib_msg_t *rxmsg = rx->rx_msg;
1814 kib_conn_t *conn = rx->rx_conn;
1818 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1821 LASSERT (mlen <= rlen);
1822 LASSERT (!in_interrupt());
1823 /* Either all pages or all vaddrs */
1824 LASSERT (!(kiov != NULL && iov != NULL));
1826 switch (rxmsg->ibm_type) {
1830 case IBLND_MSG_IMMEDIATE:
1831 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1832 if (nob > rx->rx_nob) {
1833 CERROR ("Immediate message from %s too big: %d(%d)\n",
1834 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1841 lnet_copy_flat2kiov(niov, kiov, offset,
1842 IBLND_MSG_SIZE, rxmsg,
1843 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1846 lnet_copy_flat2iov(niov, iov, offset,
1847 IBLND_MSG_SIZE, rxmsg,
1848 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1850 lnet_finalize(lntmsg, 0);
1853 case IBLND_MSG_PUT_REQ: {
1855 kib_rdma_desc_t *rd;
1856 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1859 lnet_finalize(lntmsg, 0);
1860 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1865 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1867 CERROR("Can't allocate tx for %s\n",
1868 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1869 /* Not replying will break the connection */
1875 rd = &txmsg->ibm_u.putack.ibpam_rd;
1877 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1878 niov, iov, offset, mlen);
1880 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1881 niov, kiov, offset, mlen);
1883 CERROR("Can't setup PUT sink for %s: %d\n",
1884 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1886 /* tell peer_ni it's over */
1887 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1892 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1893 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1894 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1896 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1898 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1899 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1900 kiblnd_queue_tx(tx, conn);
1902 /* reposted buffer reserved for PUT_DONE */
1903 post_credit = IBLND_POSTRX_NO_CREDIT;
1907 case IBLND_MSG_GET_REQ:
1908 if (lntmsg != NULL) {
1909 /* Optimized GET; RDMA lntmsg's payload */
1910 kiblnd_reply(ni, rx, lntmsg);
1912 /* GET didn't match anything */
1913 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1915 rxmsg->ibm_u.get.ibgm_cookie);
1920 kiblnd_post_rx(rx, post_credit);
1925 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1927 struct task_struct *task = kthread_run(fn, arg, name);
1930 return PTR_ERR(task);
1932 atomic_inc(&kiblnd_data.kib_nthreads);
1937 kiblnd_thread_fini (void)
1939 atomic_dec (&kiblnd_data.kib_nthreads);
1943 kiblnd_peer_alive (kib_peer_ni_t *peer_ni)
1945 /* This is racy, but everyone's only writing ktime_get_seconds() */
1946 peer_ni->ibp_last_alive = ktime_get_seconds();
1951 kiblnd_peer_notify (kib_peer_ni_t *peer_ni)
1954 time64_t last_alive = 0;
1955 unsigned long flags;
1957 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1959 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1960 error = peer_ni->ibp_error;
1961 peer_ni->ibp_error = 0;
1963 last_alive = peer_ni->ibp_last_alive;
1966 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1969 lnet_notify(peer_ni->ibp_ni,
1970 peer_ni->ibp_nid, 0, last_alive);
1974 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1976 /* This just does the immediate housekeeping. 'error' is zero for a
1977 * normal shutdown which can happen only after the connection has been
1978 * established. If the connection is established, schedule the
1979 * connection to be finished off by the connd. Otherwise the connd is
1980 * already dealing with it (either to set it up or tear it down).
1981 * Caller holds kib_global_lock exclusively in irq context */
1982 kib_peer_ni_t *peer_ni = conn->ibc_peer;
1984 unsigned long flags;
1986 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1988 if (error != 0 && conn->ibc_comms_error == 0)
1989 conn->ibc_comms_error = error;
1991 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1992 return; /* already being handled */
1995 list_empty(&conn->ibc_tx_noops) &&
1996 list_empty(&conn->ibc_tx_queue) &&
1997 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1998 list_empty(&conn->ibc_tx_queue_nocred) &&
1999 list_empty(&conn->ibc_active_txs)) {
2000 CDEBUG(D_NET, "closing conn to %s\n",
2001 libcfs_nid2str(peer_ni->ibp_nid));
2003 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
2004 libcfs_nid2str(peer_ni->ibp_nid), error,
2005 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
2006 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
2007 list_empty(&conn->ibc_tx_queue_rsrvd) ?
2008 "" : "(sending_rsrvd)",
2009 list_empty(&conn->ibc_tx_queue_nocred) ?
2010 "" : "(sending_nocred)",
2011 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
2014 dev = ((kib_net_t *)peer_ni->ibp_ni->ni_data)->ibn_dev;
2015 if (peer_ni->ibp_next_conn == conn)
2016 /* clear next_conn so it won't be used */
2017 peer_ni->ibp_next_conn = NULL;
2018 list_del(&conn->ibc_list);
2019 /* connd (see below) takes over ibc_list's ref */
2021 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
2022 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
2023 kiblnd_unlink_peer_locked(peer_ni);
2025 /* set/clear error on last conn */
2026 peer_ni->ibp_error = conn->ibc_comms_error;
2029 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
2032 kiblnd_dev_can_failover(dev)) {
2033 list_add_tail(&dev->ibd_fail_list,
2034 &kiblnd_data.kib_failed_devs);
2035 wake_up(&kiblnd_data.kib_failover_waitq);
2038 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2040 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2041 wake_up(&kiblnd_data.kib_connd_waitq);
2043 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2047 kiblnd_close_conn(kib_conn_t *conn, int error)
2049 unsigned long flags;
2051 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2053 kiblnd_close_conn_locked(conn, error);
2055 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2059 kiblnd_handle_early_rxs(kib_conn_t *conn)
2061 unsigned long flags;
2064 LASSERT(!in_interrupt());
2065 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2067 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2068 while (!list_empty(&conn->ibc_early_rxs)) {
2069 rx = list_entry(conn->ibc_early_rxs.next,
2071 list_del(&rx->rx_list);
2072 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2074 kiblnd_handle_rx(rx);
2076 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2078 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2082 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
2084 struct list_head zombies = LIST_HEAD_INIT(zombies);
2085 struct list_head *tmp;
2086 struct list_head *nxt;
2089 spin_lock(&conn->ibc_lock);
2091 list_for_each_safe(tmp, nxt, txs) {
2092 tx = list_entry(tmp, kib_tx_t, tx_list);
2094 if (txs == &conn->ibc_active_txs) {
2095 LASSERT(!tx->tx_queued);
2096 LASSERT(tx->tx_waiting ||
2097 tx->tx_sending != 0);
2099 LASSERT(tx->tx_queued);
2102 tx->tx_status = -ECONNABORTED;
2105 if (tx->tx_sending == 0) {
2107 list_del(&tx->tx_list);
2108 list_add(&tx->tx_list, &zombies);
2112 spin_unlock(&conn->ibc_lock);
2114 kiblnd_txlist_done(&zombies, -ECONNABORTED);
2118 kiblnd_finalise_conn (kib_conn_t *conn)
2120 LASSERT (!in_interrupt());
2121 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2123 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2125 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2126 * for connections that didn't get as far as being connected, because
2127 * rdma_disconnect() does this for free. */
2128 kiblnd_abort_receives(conn);
2130 /* Complete all tx descs not waiting for sends to complete.
2131 * NB we should be safe from RDMA now that the QP has changed state */
2133 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2134 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2135 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2136 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2137 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2139 kiblnd_handle_early_rxs(conn);
2143 kiblnd_peer_connect_failed(kib_peer_ni_t *peer_ni, int active, int error)
2145 struct list_head zombies = LIST_HEAD_INIT(zombies);
2146 unsigned long flags;
2148 LASSERT (error != 0);
2149 LASSERT (!in_interrupt());
2151 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2154 LASSERT(peer_ni->ibp_connecting > 0);
2155 peer_ni->ibp_connecting--;
2157 LASSERT (peer_ni->ibp_accepting > 0);
2158 peer_ni->ibp_accepting--;
2161 if (kiblnd_peer_connecting(peer_ni)) {
2162 /* another connection attempt under way... */
2163 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2168 peer_ni->ibp_reconnected = 0;
2169 if (list_empty(&peer_ni->ibp_conns)) {
2170 /* Take peer_ni's blocked transmits to complete with error */
2171 list_add(&zombies, &peer_ni->ibp_tx_queue);
2172 list_del_init(&peer_ni->ibp_tx_queue);
2174 if (kiblnd_peer_active(peer_ni))
2175 kiblnd_unlink_peer_locked(peer_ni);
2177 peer_ni->ibp_error = error;
2179 /* Can't have blocked transmits if there are connections */
2180 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2183 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2185 kiblnd_peer_notify(peer_ni);
2187 if (list_empty(&zombies))
2190 CNETERR("Deleting messages for %s: connection failed\n",
2191 libcfs_nid2str(peer_ni->ibp_nid));
2193 kiblnd_txlist_done(&zombies, -EHOSTUNREACH);
2197 kiblnd_connreq_done(kib_conn_t *conn, int status)
2199 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2201 struct list_head txs;
2202 unsigned long flags;
2205 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2207 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2208 libcfs_nid2str(peer_ni->ibp_nid), active,
2209 conn->ibc_version, status);
2211 LASSERT (!in_interrupt());
2212 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2213 peer_ni->ibp_connecting > 0) ||
2214 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2215 peer_ni->ibp_accepting > 0));
2217 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2218 conn->ibc_connvars = NULL;
2221 /* failed to establish connection */
2222 kiblnd_peer_connect_failed(peer_ni, active, status);
2223 kiblnd_finalise_conn(conn);
2227 /* connection established */
2228 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2230 conn->ibc_last_send = ktime_get();
2231 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2232 kiblnd_peer_alive(peer_ni);
2234 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2235 * peer_ni instance... */
2236 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2237 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2238 peer_ni->ibp_reconnected = 0;
2240 peer_ni->ibp_connecting--;
2242 peer_ni->ibp_accepting--;
2244 if (peer_ni->ibp_version == 0) {
2245 peer_ni->ibp_version = conn->ibc_version;
2246 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2249 if (peer_ni->ibp_version != conn->ibc_version ||
2250 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2251 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2252 conn->ibc_incarnation);
2253 peer_ni->ibp_version = conn->ibc_version;
2254 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2257 /* grab pending txs while I have the lock */
2258 list_add(&txs, &peer_ni->ibp_tx_queue);
2259 list_del_init(&peer_ni->ibp_tx_queue);
2261 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2262 conn->ibc_comms_error != 0) { /* error has happened already */
2264 /* start to shut down connection */
2265 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2266 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2268 kiblnd_txlist_done(&txs, -ECONNABORTED);
2273 /* +1 ref for myself, this connection is visible to other threads
2274 * now, refcount of peer:ibp_conns can be released by connection
2275 * close from either a different thread, or the calling of
2276 * kiblnd_check_sends_locked() below. See bz21911 for details.
2278 kiblnd_conn_addref(conn);
2279 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2281 /* Schedule blocked txs
2282 * Note: if we are running with conns_per_peer > 1, these blocked
2283 * txs will all get scheduled to the first connection which gets
2284 * scheduled. We won't be using round robin on this first batch.
2286 spin_lock(&conn->ibc_lock);
2287 while (!list_empty(&txs)) {
2288 tx = list_entry(txs.next, kib_tx_t, tx_list);
2289 list_del(&tx->tx_list);
2291 kiblnd_queue_tx_locked(tx, conn);
2293 kiblnd_check_sends_locked(conn);
2294 spin_unlock(&conn->ibc_lock);
2296 /* schedule blocked rxs */
2297 kiblnd_handle_early_rxs(conn);
2298 kiblnd_conn_decref(conn);
2302 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2306 rc = rdma_reject(cmid, rej, sizeof(*rej));
2309 CWARN("Error %d sending reject\n", rc);
2313 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2315 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2316 kib_msg_t *reqmsg = priv;
2319 kib_peer_ni_t *peer_ni;
2320 kib_peer_ni_t *peer2;
2322 struct lnet_ni *ni = NULL;
2323 kib_net_t *net = NULL;
2325 struct rdma_conn_param cp;
2327 int version = IBLND_MSG_VERSION;
2328 unsigned long flags;
2330 struct sockaddr_in *peer_addr;
2331 LASSERT (!in_interrupt());
2333 /* cmid inherits 'context' from the corresponding listener id */
2334 ibdev = (kib_dev_t *)cmid->context;
2335 LASSERT (ibdev != NULL);
2337 memset(&rej, 0, sizeof(rej));
2338 rej.ibr_magic = IBLND_MSG_MAGIC;
2339 rej.ibr_why = IBLND_REJECT_FATAL;
2340 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2342 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2343 if (*kiblnd_tunables.kib_require_priv_port &&
2344 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2345 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2346 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2347 &ip, ntohs(peer_addr->sin_port));
2351 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2352 CERROR("Short connection request\n");
2356 /* Future protocol version compatibility support! If the
2357 * o2iblnd-specific protocol changes, or when LNET unifies
2358 * protocols over all LNDs, the initial connection will
2359 * negotiate a protocol version. I trap this here to avoid
2360 * console errors; the reject tells the peer_ni which protocol I
2362 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2363 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2365 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2366 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2367 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2369 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2370 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2371 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2374 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2376 CERROR("Can't parse connection request: %d\n", rc);
2380 nid = reqmsg->ibm_srcnid;
2381 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2384 net = (kib_net_t *)ni->ni_data;
2385 rej.ibr_incarnation = net->ibn_incarnation;
2388 if (ni == NULL || /* no matching net */
2389 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2390 net->ibn_dev != ibdev) { /* wrong device */
2391 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2392 "bad dst nid %s\n", libcfs_nid2str(nid),
2393 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2394 ibdev->ibd_ifname, ibdev->ibd_nnets,
2396 libcfs_nid2str(reqmsg->ibm_dstnid));
2401 /* check time stamp as soon as possible */
2402 if (reqmsg->ibm_dststamp != 0 &&
2403 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2404 CWARN("Stale connection request\n");
2405 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2409 /* I can accept peer_ni's version */
2410 version = reqmsg->ibm_version;
2412 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2413 CERROR("Unexpected connreq msg type: %x from %s\n",
2414 reqmsg->ibm_type, libcfs_nid2str(nid));
2418 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2419 kiblnd_msg_queue_size(version, ni)) {
2420 CERROR("Can't accept conn from %s, queue depth too large: "
2421 " %d (<=%d wanted)\n",
2422 libcfs_nid2str(nid),
2423 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2424 kiblnd_msg_queue_size(version, ni));
2426 if (version == IBLND_MSG_VERSION)
2427 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2432 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2433 IBLND_MAX_RDMA_FRAGS) {
2434 CWARN("Can't accept conn from %s (version %x): "
2435 "max_frags %d too large (%d wanted)\n",
2436 libcfs_nid2str(nid), version,
2437 reqmsg->ibm_u.connparams.ibcp_max_frags,
2438 IBLND_MAX_RDMA_FRAGS);
2440 if (version >= IBLND_MSG_VERSION)
2441 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2444 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2445 IBLND_MAX_RDMA_FRAGS &&
2446 net->ibn_fmr_ps == NULL) {
2447 CWARN("Can't accept conn from %s (version %x): "
2448 "max_frags %d incompatible without FMR pool "
2450 libcfs_nid2str(nid), version,
2451 reqmsg->ibm_u.connparams.ibcp_max_frags,
2452 IBLND_MAX_RDMA_FRAGS);
2454 if (version == IBLND_MSG_VERSION)
2455 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2460 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2461 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2462 libcfs_nid2str(nid),
2463 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2468 /* assume 'nid' is a new peer_ni; create */
2469 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2471 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2472 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2476 /* We have validated the peer's parameters so use those */
2477 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2478 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2480 write_lock_irqsave(g_lock, flags);
2482 peer2 = kiblnd_find_peer_locked(ni, nid);
2483 if (peer2 != NULL) {
2484 if (peer2->ibp_version == 0) {
2485 peer2->ibp_version = version;
2486 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2489 /* not the guy I've talked with */
2490 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2491 peer2->ibp_version != version) {
2492 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2494 if (kiblnd_peer_active(peer2)) {
2495 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2496 peer2->ibp_version = version;
2498 write_unlock_irqrestore(g_lock, flags);
2500 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2501 libcfs_nid2str(nid), peer2->ibp_version, version,
2502 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2504 kiblnd_peer_decref(peer_ni);
2505 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2509 /* Tie-break connection race in favour of the higher NID.
2510 * If we keep running into a race condition multiple times,
2511 * we have to assume that the connection attempt with the
2512 * higher NID is stuck in a connecting state and will never
2513 * recover. As such, we pass through this if-block and let
2514 * the lower NID connection win so we can move forward.
2516 if (peer2->ibp_connecting != 0 &&
2517 nid < ni->ni_nid && peer2->ibp_races <
2518 MAX_CONN_RACES_BEFORE_ABORT) {
2520 write_unlock_irqrestore(g_lock, flags);
2522 CDEBUG(D_NET, "Conn race %s\n",
2523 libcfs_nid2str(peer2->ibp_nid));
2525 kiblnd_peer_decref(peer_ni);
2526 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2529 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2530 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2531 libcfs_nid2str(peer2->ibp_nid),
2532 MAX_CONN_RACES_BEFORE_ABORT);
2534 * passive connection is allowed even this peer_ni is waiting for
2537 peer2->ibp_reconnecting = 0;
2538 peer2->ibp_races = 0;
2539 peer2->ibp_accepting++;
2540 kiblnd_peer_addref(peer2);
2542 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2543 * so copy validated parameters since we now know what the
2544 * peer_ni's limits are */
2545 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2546 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2548 write_unlock_irqrestore(g_lock, flags);
2549 kiblnd_peer_decref(peer_ni);
2552 /* Brand new peer_ni */
2553 LASSERT (peer_ni->ibp_accepting == 0);
2554 LASSERT (peer_ni->ibp_version == 0 &&
2555 peer_ni->ibp_incarnation == 0);
2557 peer_ni->ibp_accepting = 1;
2558 peer_ni->ibp_version = version;
2559 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2561 /* I have a ref on ni that prevents it being shutdown */
2562 LASSERT (net->ibn_shutdown == 0);
2564 kiblnd_peer_addref(peer_ni);
2565 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2567 write_unlock_irqrestore(g_lock, flags);
2570 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2572 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2573 kiblnd_peer_decref(peer_ni);
2574 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2578 /* conn now "owns" cmid, so I return success from here on to ensure the
2579 * CM callback doesn't destroy cmid. */
2580 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2581 conn->ibc_credits = conn->ibc_queue_depth;
2582 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2583 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2584 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2586 ackmsg = &conn->ibc_connvars->cv_msg;
2587 memset(ackmsg, 0, sizeof(*ackmsg));
2589 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2590 sizeof(ackmsg->ibm_u.connparams));
2591 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2592 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2593 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2595 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2597 memset(&cp, 0, sizeof(cp));
2598 cp.private_data = ackmsg;
2599 cp.private_data_len = ackmsg->ibm_nob;
2600 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2601 cp.initiator_depth = 0;
2602 cp.flow_control = 1;
2603 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2604 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2606 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2608 rc = rdma_accept(cmid, &cp);
2610 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2611 rej.ibr_version = version;
2612 rej.ibr_why = IBLND_REJECT_FATAL;
2614 kiblnd_reject(cmid, &rej);
2615 kiblnd_connreq_done(conn, rc);
2616 kiblnd_conn_decref(conn);
2624 rej.ibr_cp.ibcp_queue_depth =
2625 kiblnd_msg_queue_size(version, ni);
2626 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2630 rej.ibr_version = version;
2631 kiblnd_reject(cmid, &rej);
2633 return -ECONNREFUSED;
2637 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2638 __u64 incarnation, int why, kib_connparams_t *cp)
2640 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2641 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2643 int msg_size = IBLND_MSG_SIZE;
2647 unsigned long flags;
2649 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2650 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2653 msg_size = cp->ibcp_max_msg_size;
2654 frag_num = cp->ibcp_max_frags;
2655 queue_dep = cp->ibcp_queue_depth;
2658 write_lock_irqsave(glock, flags);
2659 /* retry connection if it's still needed and no other connection
2660 * attempts (active or passive) are in progress
2661 * NB: reconnect is still needed even when ibp_tx_queue is
2662 * empty if ibp_version != version because reconnect may be
2663 * initiated by kiblnd_query() */
2664 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2665 peer_ni->ibp_version != version) &&
2666 peer_ni->ibp_connecting &&
2667 peer_ni->ibp_accepting == 0;
2678 case IBLND_REJECT_RDMA_FRAGS: {
2679 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2682 reason = "can't negotiate max frags";
2685 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2686 #ifdef HAVE_IB_GET_DMA_MR
2688 * This check only makes sense if the kernel supports global
2689 * memory registration. Otherwise, map_on_demand will never == 0
2691 if (!tunables->lnd_map_on_demand) {
2692 reason = "map_on_demand must be enabled";
2696 if (conn->ibc_max_frags <= frag_num) {
2697 reason = "unsupported max frags";
2701 peer_ni->ibp_max_frags = frag_num;
2702 reason = "rdma fragments";
2705 case IBLND_REJECT_MSG_QUEUE_SIZE:
2707 reason = "can't negotiate queue depth";
2710 if (conn->ibc_queue_depth <= queue_dep) {
2711 reason = "unsupported queue depth";
2715 peer_ni->ibp_queue_depth = queue_dep;
2716 reason = "queue depth";
2719 case IBLND_REJECT_CONN_STALE:
2723 case IBLND_REJECT_CONN_RACE:
2724 reason = "conn race";
2727 case IBLND_REJECT_CONN_UNCOMPAT:
2728 reason = "version negotiation";
2731 case IBLND_REJECT_INVALID_SRV_ID:
2732 reason = "invalid service id";
2736 conn->ibc_reconnect = 1;
2737 peer_ni->ibp_reconnecting++;
2738 peer_ni->ibp_version = version;
2739 if (incarnation != 0)
2740 peer_ni->ibp_incarnation = incarnation;
2742 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2744 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2745 libcfs_nid2str(peer_ni->ibp_nid),
2746 reconnect ? "reconnect" : "don't reconnect",
2747 reason, IBLND_MSG_VERSION, version, msg_size,
2748 conn->ibc_queue_depth, queue_dep,
2749 conn->ibc_max_frags, frag_num);
2751 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2752 * while destroying the zombie
2757 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2759 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2761 LASSERT (!in_interrupt());
2762 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2765 case IB_CM_REJ_STALE_CONN:
2766 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2767 IBLND_REJECT_CONN_STALE, NULL);
2770 case IB_CM_REJ_INVALID_SERVICE_ID:
2771 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2772 IBLND_REJECT_INVALID_SRV_ID, NULL);
2773 CNETERR("%s rejected: no listener at %d\n",
2774 libcfs_nid2str(peer_ni->ibp_nid),
2775 *kiblnd_tunables.kib_service);
2778 case IB_CM_REJ_CONSUMER_DEFINED:
2779 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2780 kib_rej_t *rej = priv;
2781 kib_connparams_t *cp = NULL;
2783 __u64 incarnation = -1;
2785 /* NB. default incarnation is -1 because:
2786 * a) V1 will ignore dst incarnation in connreq.
2787 * b) V2 will provide incarnation while rejecting me,
2788 * -1 will be overwrote.
2790 * if I try to connect to a V1 peer_ni with V2 protocol,
2791 * it rejected me then upgrade to V2, I have no idea
2792 * about the upgrading and try to reconnect with V1,
2793 * in this case upgraded V2 can find out I'm trying to
2794 * talk to the old guy and reject me(incarnation is -1).
2797 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2798 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2799 __swab32s(&rej->ibr_magic);
2800 __swab16s(&rej->ibr_version);
2804 if (priv_nob >= sizeof(kib_rej_t) &&
2805 rej->ibr_version > IBLND_MSG_VERSION_1) {
2806 /* priv_nob is always 148 in current version
2807 * of OFED, so we still need to check version.
2808 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2812 __swab64s(&rej->ibr_incarnation);
2813 __swab16s(&cp->ibcp_queue_depth);
2814 __swab16s(&cp->ibcp_max_frags);
2815 __swab32s(&cp->ibcp_max_msg_size);
2818 incarnation = rej->ibr_incarnation;
2821 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2822 rej->ibr_magic != LNET_PROTO_MAGIC) {
2823 CERROR("%s rejected: consumer defined fatal error\n",
2824 libcfs_nid2str(peer_ni->ibp_nid));
2828 if (rej->ibr_version != IBLND_MSG_VERSION &&
2829 rej->ibr_version != IBLND_MSG_VERSION_1) {
2830 CERROR("%s rejected: o2iblnd version %x error\n",
2831 libcfs_nid2str(peer_ni->ibp_nid),
2836 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2837 rej->ibr_version == IBLND_MSG_VERSION_1) {
2838 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2839 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2841 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2842 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2845 switch (rej->ibr_why) {
2846 case IBLND_REJECT_CONN_RACE:
2847 case IBLND_REJECT_CONN_STALE:
2848 case IBLND_REJECT_CONN_UNCOMPAT:
2849 case IBLND_REJECT_MSG_QUEUE_SIZE:
2850 case IBLND_REJECT_RDMA_FRAGS:
2851 kiblnd_check_reconnect(conn, rej->ibr_version,
2852 incarnation, rej->ibr_why, cp);
2855 case IBLND_REJECT_NO_RESOURCES:
2856 CERROR("%s rejected: o2iblnd no resources\n",
2857 libcfs_nid2str(peer_ni->ibp_nid));
2860 case IBLND_REJECT_FATAL:
2861 CERROR("%s rejected: o2iblnd fatal error\n",
2862 libcfs_nid2str(peer_ni->ibp_nid));
2866 CERROR("%s rejected: o2iblnd reason %d\n",
2867 libcfs_nid2str(peer_ni->ibp_nid),
2875 CNETERR("%s rejected: reason %d, size %d\n",
2876 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2880 kiblnd_connreq_done(conn, -ECONNREFUSED);
2884 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2886 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2887 struct lnet_ni *ni = peer_ni->ibp_ni;
2888 kib_net_t *net = ni->ni_data;
2889 kib_msg_t *msg = priv;
2890 int ver = conn->ibc_version;
2891 int rc = kiblnd_unpack_msg(msg, priv_nob);
2892 unsigned long flags;
2894 LASSERT (net != NULL);
2897 CERROR("Can't unpack connack from %s: %d\n",
2898 libcfs_nid2str(peer_ni->ibp_nid), rc);
2902 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2903 CERROR("Unexpected message %d from %s\n",
2904 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2909 if (ver != msg->ibm_version) {
2910 CERROR("%s replied version %x is different with "
2911 "requested version %x\n",
2912 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2917 if (msg->ibm_u.connparams.ibcp_queue_depth >
2918 conn->ibc_queue_depth) {
2919 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2920 libcfs_nid2str(peer_ni->ibp_nid),
2921 msg->ibm_u.connparams.ibcp_queue_depth,
2922 conn->ibc_queue_depth);
2927 if (msg->ibm_u.connparams.ibcp_max_frags >
2928 conn->ibc_max_frags) {
2929 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2930 libcfs_nid2str(peer_ni->ibp_nid),
2931 msg->ibm_u.connparams.ibcp_max_frags,
2932 conn->ibc_max_frags);
2937 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2938 CERROR("%s max message size %d too big (%d max)\n",
2939 libcfs_nid2str(peer_ni->ibp_nid),
2940 msg->ibm_u.connparams.ibcp_max_msg_size,
2946 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2947 if (msg->ibm_dstnid == ni->ni_nid &&
2948 msg->ibm_dststamp == net->ibn_incarnation)
2952 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2955 CERROR("Bad connection reply from %s, rc = %d, "
2956 "version: %x max_frags: %d\n",
2957 libcfs_nid2str(peer_ni->ibp_nid), rc,
2958 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2962 conn->ibc_incarnation = msg->ibm_srcstamp;
2963 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2964 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2965 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2966 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2967 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2968 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2970 kiblnd_connreq_done(conn, 0);
2974 /* NB My QP has already established itself, so I handle anything going
2975 * wrong here by setting ibc_comms_error.
2976 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2977 * immediately tears it down. */
2980 conn->ibc_comms_error = rc;
2981 kiblnd_connreq_done(conn, 0);
2985 kiblnd_active_connect (struct rdma_cm_id *cmid)
2987 kib_peer_ni_t *peer_ni = (kib_peer_ni_t *)cmid->context;
2990 struct rdma_conn_param cp;
2993 unsigned long flags;
2996 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2998 incarnation = peer_ni->ibp_incarnation;
2999 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
3000 peer_ni->ibp_version;
3002 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3004 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3007 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3008 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3012 /* conn "owns" cmid now, so I return success from here on to ensure the
3013 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3016 msg = &conn->ibc_connvars->cv_msg;
3018 memset(msg, 0, sizeof(*msg));
3019 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3020 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3021 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3022 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3024 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3025 0, peer_ni->ibp_nid, incarnation);
3027 memset(&cp, 0, sizeof(cp));
3028 cp.private_data = msg;
3029 cp.private_data_len = msg->ibm_nob;
3030 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3031 cp.initiator_depth = 0;
3032 cp.flow_control = 1;
3033 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3034 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3036 LASSERT(cmid->context == (void *)conn);
3037 LASSERT(conn->ibc_cmid == cmid);
3039 rc = rdma_connect(cmid, &cp);
3041 CERROR("Can't connect to %s: %d\n",
3042 libcfs_nid2str(peer_ni->ibp_nid), rc);
3043 kiblnd_connreq_done(conn, rc);
3044 kiblnd_conn_decref(conn);
3051 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3053 kib_peer_ni_t *peer_ni;
3057 switch (event->event) {
3059 CERROR("Unexpected event: %d, status: %d\n",
3060 event->event, event->status);
3063 case RDMA_CM_EVENT_CONNECT_REQUEST:
3064 /* destroy cmid on failure */
3065 rc = kiblnd_passive_connect(cmid,
3066 (void *)KIBLND_CONN_PARAM(event),
3067 KIBLND_CONN_PARAM_LEN(event));
3068 CDEBUG(D_NET, "connreq: %d\n", rc);
3071 case RDMA_CM_EVENT_ADDR_ERROR:
3072 peer_ni = (kib_peer_ni_t *)cmid->context;
3073 CNETERR("%s: ADDR ERROR %d\n",
3074 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3075 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3076 kiblnd_peer_decref(peer_ni);
3077 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3079 case RDMA_CM_EVENT_ADDR_RESOLVED:
3080 peer_ni = (kib_peer_ni_t *)cmid->context;
3082 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3083 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3085 if (event->status != 0) {
3086 CNETERR("Can't resolve address for %s: %d\n",
3087 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3090 rc = rdma_resolve_route(
3091 cmid, *kiblnd_tunables.kib_timeout * 1000);
3093 kib_net_t *net = peer_ni->ibp_ni->ni_data;
3094 kib_dev_t *dev = net->ibn_dev;
3096 CDEBUG(D_NET, "%s: connection bound to "\
3098 libcfs_nid2str(peer_ni->ibp_nid),
3100 &dev->ibd_ifip, cmid->device->name);
3105 /* Can't initiate route resolution */
3106 CERROR("Can't resolve route for %s: %d\n",
3107 libcfs_nid2str(peer_ni->ibp_nid), rc);
3109 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3110 kiblnd_peer_decref(peer_ni);
3111 return rc; /* rc != 0 destroys cmid */
3113 case RDMA_CM_EVENT_ROUTE_ERROR:
3114 peer_ni = (kib_peer_ni_t *)cmid->context;
3115 CNETERR("%s: ROUTE ERROR %d\n",
3116 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3117 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3118 kiblnd_peer_decref(peer_ni);
3119 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3121 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3122 peer_ni = (kib_peer_ni_t *)cmid->context;
3123 CDEBUG(D_NET,"%s Route resolved: %d\n",
3124 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3126 if (event->status == 0)
3127 return kiblnd_active_connect(cmid);
3129 CNETERR("Can't resolve route for %s: %d\n",
3130 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3131 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3132 kiblnd_peer_decref(peer_ni);
3133 return event->status; /* rc != 0 destroys cmid */
3135 case RDMA_CM_EVENT_UNREACHABLE:
3136 conn = (kib_conn_t *)cmid->context;
3137 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3138 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3139 CNETERR("%s: UNREACHABLE %d\n",
3140 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3141 kiblnd_connreq_done(conn, -ENETDOWN);
3142 kiblnd_conn_decref(conn);
3145 case RDMA_CM_EVENT_CONNECT_ERROR:
3146 conn = (kib_conn_t *)cmid->context;
3147 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3148 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3149 CNETERR("%s: CONNECT ERROR %d\n",
3150 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3151 kiblnd_connreq_done(conn, -ENOTCONN);
3152 kiblnd_conn_decref(conn);
3155 case RDMA_CM_EVENT_REJECTED:
3156 conn = (kib_conn_t *)cmid->context;
3157 switch (conn->ibc_state) {
3161 case IBLND_CONN_PASSIVE_WAIT:
3162 CERROR ("%s: REJECTED %d\n",
3163 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3165 kiblnd_connreq_done(conn, -ECONNRESET);
3168 case IBLND_CONN_ACTIVE_CONNECT:
3169 kiblnd_rejected(conn, event->status,
3170 (void *)KIBLND_CONN_PARAM(event),
3171 KIBLND_CONN_PARAM_LEN(event));
3174 kiblnd_conn_decref(conn);
3177 case RDMA_CM_EVENT_ESTABLISHED:
3178 conn = (kib_conn_t *)cmid->context;
3179 switch (conn->ibc_state) {
3183 case IBLND_CONN_PASSIVE_WAIT:
3184 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3185 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3186 kiblnd_connreq_done(conn, 0);
3189 case IBLND_CONN_ACTIVE_CONNECT:
3190 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3191 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3192 kiblnd_check_connreply(conn,
3193 (void *)KIBLND_CONN_PARAM(event),
3194 KIBLND_CONN_PARAM_LEN(event));
3197 /* net keeps its ref on conn! */
3200 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3201 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3204 case RDMA_CM_EVENT_DISCONNECTED:
3205 conn = (kib_conn_t *)cmid->context;
3206 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3207 CERROR("%s DISCONNECTED\n",
3208 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3209 kiblnd_connreq_done(conn, -ECONNRESET);
3211 kiblnd_close_conn(conn, 0);
3213 kiblnd_conn_decref(conn);
3214 cmid->context = NULL;
3217 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3218 LCONSOLE_ERROR_MSG(0x131,
3219 "Received notification of device removal\n"
3220 "Please shutdown LNET to allow this to proceed\n");
3221 /* Can't remove network from underneath LNET for now, so I have
3225 case RDMA_CM_EVENT_ADDR_CHANGE:
3226 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3232 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3235 struct list_head *ttmp;
3237 list_for_each(ttmp, txs) {
3238 tx = list_entry(ttmp, kib_tx_t, tx_list);
3240 if (txs != &conn->ibc_active_txs) {
3241 LASSERT(tx->tx_queued);
3243 LASSERT(!tx->tx_queued);
3244 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3247 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3248 CERROR("Timed out tx: %s, %lld seconds\n",
3249 kiblnd_queue2str(conn, txs),
3250 ktime_ms_delta(ktime_get(),
3251 tx->tx_deadline) / MSEC_PER_SEC);
3260 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3262 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3263 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3264 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3265 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3266 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3270 kiblnd_check_conns (int idx)
3272 struct list_head closes = LIST_HEAD_INIT(closes);
3273 struct list_head checksends = LIST_HEAD_INIT(checksends);
3274 struct list_head timedout_txs = LIST_HEAD_INIT(timedout_txs);
3275 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3276 struct list_head *ptmp;
3277 kib_peer_ni_t *peer_ni;
3279 kib_tx_t *tx, *tx_tmp;
3280 struct list_head *ctmp;
3281 unsigned long flags;
3283 /* NB. We expect to have a look at all the peers and not find any
3284 * RDMAs to time out, so we just use a shared lock while we
3286 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3288 list_for_each(ptmp, peers) {
3289 peer_ni = list_entry(ptmp, kib_peer_ni_t, ibp_list);
3291 /* Check tx_deadline */
3292 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3293 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3294 CWARN("Timed out tx for %s: %lld seconds\n",
3295 libcfs_nid2str(peer_ni->ibp_nid),
3296 ktime_ms_delta(ktime_get(),
3297 tx->tx_deadline) / MSEC_PER_SEC);
3298 list_move(&tx->tx_list, &timedout_txs);
3302 list_for_each(ctmp, &peer_ni->ibp_conns) {
3306 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3308 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3310 spin_lock(&conn->ibc_lock);
3312 sendnoop = kiblnd_need_noop(conn);
3313 timedout = kiblnd_conn_timed_out_locked(conn);
3314 if (!sendnoop && !timedout) {
3315 spin_unlock(&conn->ibc_lock);
3320 CERROR("Timed out RDMA with %s (%lld): "
3321 "c: %u, oc: %u, rc: %u\n",
3322 libcfs_nid2str(peer_ni->ibp_nid),
3323 ktime_get_seconds() - peer_ni->ibp_last_alive,
3325 conn->ibc_outstanding_credits,
3326 conn->ibc_reserved_credits);
3327 list_add(&conn->ibc_connd_list, &closes);
3329 list_add(&conn->ibc_connd_list, &checksends);
3331 /* +ref for 'closes' or 'checksends' */
3332 kiblnd_conn_addref(conn);
3334 spin_unlock(&conn->ibc_lock);
3338 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3340 if (!list_empty(&timedout_txs))
3341 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT);
3343 /* Handle timeout by closing the whole
3344 * connection. We can only be sure RDMA activity
3345 * has ceased once the QP has been modified. */
3346 while (!list_empty(&closes)) {
3347 conn = list_entry(closes.next,
3348 kib_conn_t, ibc_connd_list);
3349 list_del(&conn->ibc_connd_list);
3350 kiblnd_close_conn(conn, -ETIMEDOUT);
3351 kiblnd_conn_decref(conn);
3354 /* In case we have enough credits to return via a
3355 * NOOP, but there were no non-blocking tx descs
3356 * free to do it last time... */
3357 while (!list_empty(&checksends)) {
3358 conn = list_entry(checksends.next,
3359 kib_conn_t, ibc_connd_list);
3360 list_del(&conn->ibc_connd_list);
3362 spin_lock(&conn->ibc_lock);
3363 kiblnd_check_sends_locked(conn);
3364 spin_unlock(&conn->ibc_lock);
3366 kiblnd_conn_decref(conn);
3371 kiblnd_disconnect_conn (kib_conn_t *conn)
3373 LASSERT (!in_interrupt());
3374 LASSERT (current == kiblnd_data.kib_connd);
3375 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3377 rdma_disconnect(conn->ibc_cmid);
3378 kiblnd_finalise_conn(conn);
3380 kiblnd_peer_notify(conn->ibc_peer);
3384 * High-water for reconnection to the same peer_ni, reconnection attempt should
3385 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3387 #define KIB_RECONN_HIGH_RACE 10
3389 * Allow connd to take a break and handle other things after consecutive
3390 * reconnection attemps.
3392 #define KIB_RECONN_BREAK 100
3395 kiblnd_connd (void *arg)
3397 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3398 wait_queue_entry_t wait;
3399 unsigned long flags;
3405 unsigned long deadline = jiffies;
3407 cfs_block_allsigs();
3409 init_waitqueue_entry(&wait, current);
3410 kiblnd_data.kib_connd = current;
3412 spin_lock_irqsave(lock, flags);
3414 while (!kiblnd_data.kib_shutdown) {
3419 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3420 kib_peer_ni_t *peer_ni = NULL;
3422 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3423 kib_conn_t, ibc_list);
3424 list_del(&conn->ibc_list);
3425 if (conn->ibc_reconnect) {
3426 peer_ni = conn->ibc_peer;
3427 kiblnd_peer_addref(peer_ni);
3430 spin_unlock_irqrestore(lock, flags);
3433 kiblnd_destroy_conn(conn, !peer_ni);
3435 spin_lock_irqsave(lock, flags);
3439 conn->ibc_peer = peer_ni;
3440 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3441 list_add_tail(&conn->ibc_list,
3442 &kiblnd_data.kib_reconn_list);
3444 list_add_tail(&conn->ibc_list,
3445 &kiblnd_data.kib_reconn_wait);
3448 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3449 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3450 kib_conn_t, ibc_list);
3451 list_del(&conn->ibc_list);
3453 spin_unlock_irqrestore(lock, flags);
3456 kiblnd_disconnect_conn(conn);
3457 kiblnd_conn_decref(conn);
3459 spin_lock_irqsave(lock, flags);
3462 while (reconn < KIB_RECONN_BREAK) {
3463 if (kiblnd_data.kib_reconn_sec !=
3464 ktime_get_real_seconds()) {
3465 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3466 list_splice_init(&kiblnd_data.kib_reconn_wait,
3467 &kiblnd_data.kib_reconn_list);
3470 if (list_empty(&kiblnd_data.kib_reconn_list))
3473 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3474 kib_conn_t, ibc_list);
3475 list_del(&conn->ibc_list);
3477 spin_unlock_irqrestore(lock, flags);
3480 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3481 kiblnd_peer_decref(conn->ibc_peer);
3482 LIBCFS_FREE(conn, sizeof(*conn));
3484 spin_lock_irqsave(lock, flags);
3487 /* careful with the jiffy wrap... */
3488 timeout = (int)(deadline - jiffies);
3492 int chunk = kiblnd_data.kib_peer_hash_size;
3494 spin_unlock_irqrestore(lock, flags);
3497 /* Time to check for RDMA timeouts on a few more
3498 * peers: I do checks every 'p' seconds on a
3499 * proportion of the peer_ni table and I need to check
3500 * every connection 'n' times within a timeout
3501 * interval, to ensure I detect a timeout on any
3502 * connection within (n+1)/n times the timeout
3505 if (*kiblnd_tunables.kib_timeout > n * p)
3506 chunk = (chunk * n * p) /
3507 *kiblnd_tunables.kib_timeout;
3511 for (i = 0; i < chunk; i++) {
3512 kiblnd_check_conns(peer_index);
3513 peer_index = (peer_index + 1) %
3514 kiblnd_data.kib_peer_hash_size;
3517 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3518 spin_lock_irqsave(lock, flags);
3524 /* Nothing to do for 'timeout' */
3525 set_current_state(TASK_INTERRUPTIBLE);
3526 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3527 spin_unlock_irqrestore(lock, flags);
3529 schedule_timeout(timeout);
3531 set_current_state(TASK_RUNNING);
3532 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3533 spin_lock_irqsave(lock, flags);
3536 spin_unlock_irqrestore(lock, flags);
3538 kiblnd_thread_fini();
3543 kiblnd_qp_event(struct ib_event *event, void *arg)
3545 kib_conn_t *conn = arg;
3547 switch (event->event) {
3548 case IB_EVENT_COMM_EST:
3549 CDEBUG(D_NET, "%s established\n",
3550 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3551 /* We received a packet but connection isn't established
3552 * probably handshake packet was lost, so free to
3553 * force make connection established */
3554 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3558 CERROR("%s: Async QP event type %d\n",
3559 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3565 kiblnd_complete (struct ib_wc *wc)
3567 switch (kiblnd_wreqid2type(wc->wr_id)) {
3572 if (wc->status != IB_WC_SUCCESS &&
3573 wc->status != IB_WC_WR_FLUSH_ERR)
3574 CNETERR("FastReg failed: %d\n", wc->status);
3577 case IBLND_WID_RDMA:
3578 /* We only get RDMA completion notification if it fails. All
3579 * subsequent work items, including the final SEND will fail
3580 * too. However we can't print out any more info about the
3581 * failing RDMA because 'tx' might be back on the idle list or
3582 * even reused already if we didn't manage to post all our work
3584 CNETERR("RDMA (tx: %p) failed: %d\n",
3585 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3589 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3593 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3600 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3602 /* NB I'm not allowed to schedule this conn once its refcount has
3603 * reached 0. Since fundamentally I'm racing with scheduler threads
3604 * consuming my CQ I could be called after all completions have
3605 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3606 * and this CQ is about to be destroyed so I NOOP. */
3607 kib_conn_t *conn = (kib_conn_t *)arg;
3608 struct kib_sched_info *sched = conn->ibc_sched;
3609 unsigned long flags;
3611 LASSERT(cq == conn->ibc_cq);
3613 spin_lock_irqsave(&sched->ibs_lock, flags);
3615 conn->ibc_ready = 1;
3617 if (!conn->ibc_scheduled &&
3618 (conn->ibc_nrx > 0 ||
3619 conn->ibc_nsends_posted > 0)) {
3620 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3621 conn->ibc_scheduled = 1;
3622 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3624 if (waitqueue_active(&sched->ibs_waitq))
3625 wake_up(&sched->ibs_waitq);
3628 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3632 kiblnd_cq_event(struct ib_event *event, void *arg)
3634 kib_conn_t *conn = arg;
3636 CERROR("%s: async CQ event type %d\n",
3637 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3641 kiblnd_scheduler(void *arg)
3643 long id = (long)arg;
3644 struct kib_sched_info *sched;
3646 wait_queue_entry_t wait;
3647 unsigned long flags;
3653 cfs_block_allsigs();
3655 init_waitqueue_entry(&wait, current);
3657 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3659 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3661 CWARN("Unable to bind on CPU partition %d, please verify "
3662 "whether all CPUs are healthy and reload modules if "
3663 "necessary, otherwise your system might under risk of "
3664 "low performance\n", sched->ibs_cpt);
3667 spin_lock_irqsave(&sched->ibs_lock, flags);
3669 while (!kiblnd_data.kib_shutdown) {
3670 if (busy_loops++ >= IBLND_RESCHED) {
3671 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3676 spin_lock_irqsave(&sched->ibs_lock, flags);
3681 if (!list_empty(&sched->ibs_conns)) {
3682 conn = list_entry(sched->ibs_conns.next,
3683 kib_conn_t, ibc_sched_list);
3684 /* take over kib_sched_conns' ref on conn... */
3685 LASSERT(conn->ibc_scheduled);
3686 list_del(&conn->ibc_sched_list);
3687 conn->ibc_ready = 0;
3689 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3691 wc.wr_id = IBLND_WID_INVAL;
3693 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3695 rc = ib_req_notify_cq(conn->ibc_cq,
3698 CWARN("%s: ib_req_notify_cq failed: %d, "
3699 "closing connection\n",
3700 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3701 kiblnd_close_conn(conn, -EIO);
3702 kiblnd_conn_decref(conn);
3703 spin_lock_irqsave(&sched->ibs_lock,
3708 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3711 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3713 "ib_poll_cq (rc: %d) returned invalid "
3714 "wr_id, opcode %d, status: %d, "
3715 "vendor_err: %d, conn: %s status: %d\n"
3716 "please upgrade firmware and OFED or "
3717 "contact vendor.\n", rc,
3718 wc.opcode, wc.status, wc.vendor_err,
3719 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3725 CWARN("%s: ib_poll_cq failed: %d, "
3726 "closing connection\n",
3727 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3729 kiblnd_close_conn(conn, -EIO);
3730 kiblnd_conn_decref(conn);
3731 spin_lock_irqsave(&sched->ibs_lock, flags);
3735 spin_lock_irqsave(&sched->ibs_lock, flags);
3737 if (rc != 0 || conn->ibc_ready) {
3738 /* There may be another completion waiting; get
3739 * another scheduler to check while I handle
3741 /* +1 ref for sched_conns */
3742 kiblnd_conn_addref(conn);
3743 list_add_tail(&conn->ibc_sched_list,
3745 if (waitqueue_active(&sched->ibs_waitq))
3746 wake_up(&sched->ibs_waitq);
3748 conn->ibc_scheduled = 0;
3752 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3753 kiblnd_complete(&wc);
3755 spin_lock_irqsave(&sched->ibs_lock, flags);
3758 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3765 set_current_state(TASK_INTERRUPTIBLE);
3766 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3767 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3772 remove_wait_queue(&sched->ibs_waitq, &wait);
3773 set_current_state(TASK_RUNNING);
3774 spin_lock_irqsave(&sched->ibs_lock, flags);
3777 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3779 kiblnd_thread_fini();
3784 kiblnd_failover_thread(void *arg)
3786 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3788 wait_queue_entry_t wait;
3789 unsigned long flags;
3792 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3794 cfs_block_allsigs();
3796 init_waitqueue_entry(&wait, current);
3797 write_lock_irqsave(glock, flags);
3799 while (!kiblnd_data.kib_shutdown) {
3800 int do_failover = 0;
3803 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3805 if (ktime_get_seconds() < dev->ibd_next_failover)
3812 list_del_init(&dev->ibd_fail_list);
3813 dev->ibd_failover = 1;
3814 write_unlock_irqrestore(glock, flags);
3816 rc = kiblnd_dev_failover(dev);
3818 write_lock_irqsave(glock, flags);
3820 LASSERT (dev->ibd_failover);
3821 dev->ibd_failover = 0;
3822 if (rc >= 0) { /* Device is OK or failover succeed */
3823 dev->ibd_next_failover = ktime_get_seconds() + 3;
3827 /* failed to failover, retry later */
3828 dev->ibd_next_failover = ktime_get_seconds() +
3829 min(dev->ibd_failed_failover, 10);
3830 if (kiblnd_dev_can_failover(dev)) {
3831 list_add_tail(&dev->ibd_fail_list,
3832 &kiblnd_data.kib_failed_devs);
3838 /* long sleep if no more pending failover */
3839 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3841 set_current_state(TASK_INTERRUPTIBLE);
3842 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3843 write_unlock_irqrestore(glock, flags);
3845 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3846 cfs_time_seconds(1));
3847 set_current_state(TASK_RUNNING);
3848 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3849 write_lock_irqsave(glock, flags);
3851 if (!long_sleep || rc != 0)
3854 /* have a long sleep, routine check all active devices,
3855 * we need checking like this because if there is not active
3856 * connection on the dev and no SEND from local, we may listen
3857 * on wrong HCA for ever while there is a bonding failover */
3858 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3859 if (kiblnd_dev_can_failover(dev)) {
3860 list_add_tail(&dev->ibd_fail_list,
3861 &kiblnd_data.kib_failed_devs);
3866 write_unlock_irqrestore(glock, flags);
3868 kiblnd_thread_fini();