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/
31 * lnet/klnds/o2iblnd/o2iblnd_cb.c
33 * Author: Eric Barton <eric@bartonsoftware.com>
38 #define MAX_CONN_RACES_BEFORE_ABORT 20
40 static void kiblnd_peer_alive(struct kib_peer_ni *peer_ni);
41 static void kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
43 static void kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx,
44 int type, int body_nob);
45 static int kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
46 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie);
47 static void kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn);
48 static void kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn);
50 static void kiblnd_unmap_tx(struct kib_tx *tx);
51 static void kiblnd_check_sends_locked(struct kib_conn *conn);
54 kiblnd_tx_done(struct kib_tx *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 /* propagate health status to LNet for requests */
89 if (i == 0 && lntmsg[i])
90 lntmsg[i]->msg_health_status = tx->tx_hstatus;
92 lnet_finalize(lntmsg[i], rc);
97 kiblnd_txlist_done(struct list_head *txlist, int status,
98 enum lnet_msg_hstatus hstatus)
102 while ((tx = list_first_entry_or_null(txlist,
105 list_del(&tx->tx_list);
108 tx->tx_status = status;
109 if (hstatus != LNET_MSG_STATUS_OK)
110 tx->tx_hstatus = hstatus;
115 static struct kib_tx *
116 kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
118 struct kib_net *net = ni->ni_data;
119 struct list_head *node;
121 struct kib_tx_poolset *tps;
123 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
124 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
127 tx = container_of(node, struct kib_tx, tx_list);
129 LASSERT (tx->tx_nwrq == 0);
130 LASSERT (!tx->tx_queued);
131 LASSERT (tx->tx_sending == 0);
132 LASSERT (!tx->tx_waiting);
133 LASSERT (tx->tx_status == 0);
134 LASSERT (tx->tx_conn == NULL);
135 LASSERT (tx->tx_lntmsg[0] == NULL);
136 LASSERT (tx->tx_lntmsg[1] == NULL);
137 LASSERT (tx->tx_nfrags == 0);
140 tx->tx_hstatus = LNET_MSG_STATUS_OK;
146 kiblnd_drop_rx(struct kib_rx *rx)
148 struct kib_conn *conn = rx->rx_conn;
149 struct kib_sched_info *sched = conn->ibc_sched;
152 spin_lock_irqsave(&sched->ibs_lock, flags);
153 LASSERT(conn->ibc_nrx > 0);
155 spin_unlock_irqrestore(&sched->ibs_lock, flags);
157 kiblnd_conn_decref(conn);
161 kiblnd_post_rx(struct kib_rx *rx, int credit)
163 struct kib_conn *conn = rx->rx_conn;
164 struct kib_net *net = conn->ibc_peer->ibp_ni->ni_data;
165 struct ib_recv_wr *bad_wrq = NULL;
166 #ifdef HAVE_IB_GET_DMA_MR
167 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
171 LASSERT (net != NULL);
172 LASSERT (!in_interrupt());
173 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
174 credit == IBLND_POSTRX_PEER_CREDIT ||
175 credit == IBLND_POSTRX_RSRVD_CREDIT);
176 #ifdef HAVE_IB_GET_DMA_MR
179 rx->rx_sge.lkey = mr->lkey;
181 rx->rx_sge.lkey = conn->ibc_hdev->ibh_pd->local_dma_lkey;
183 rx->rx_sge.addr = rx->rx_msgaddr;
184 rx->rx_sge.length = IBLND_MSG_SIZE;
186 rx->rx_wrq.next = NULL;
187 rx->rx_wrq.sg_list = &rx->rx_sge;
188 rx->rx_wrq.num_sge = 1;
189 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
191 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
192 LASSERT (rx->rx_nob >= 0); /* not posted */
194 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
195 kiblnd_drop_rx(rx); /* No more posts for this rx */
199 rx->rx_nob = -1; /* flag posted */
201 /* NB: need an extra reference after ib_post_recv because we don't
202 * own this rx (and rx::rx_conn) anymore, LU-5678.
204 kiblnd_conn_addref(conn);
205 #ifdef HAVE_IB_POST_SEND_RECV_CONST
206 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq,
207 (const struct ib_recv_wr **)&bad_wrq);
209 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
211 if (unlikely(rc != 0)) {
212 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
213 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
217 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
220 if (unlikely(rc != 0)) {
221 kiblnd_close_conn(conn, rc);
222 kiblnd_drop_rx(rx); /* No more posts for this rx */
226 if (credit == IBLND_POSTRX_NO_CREDIT)
229 spin_lock(&conn->ibc_lock);
230 if (credit == IBLND_POSTRX_PEER_CREDIT)
231 conn->ibc_outstanding_credits++;
233 conn->ibc_reserved_credits++;
234 kiblnd_check_sends_locked(conn);
235 spin_unlock(&conn->ibc_lock);
238 kiblnd_conn_decref(conn);
242 static struct kib_tx *
243 kiblnd_find_waiting_tx_locked(struct kib_conn *conn, int txtype, u64 cookie)
247 list_for_each_entry(tx, &conn->ibc_active_txs, tx_list) {
248 LASSERT(!tx->tx_queued);
249 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
251 if (tx->tx_cookie != cookie)
254 if (tx->tx_waiting &&
255 tx->tx_msg->ibm_type == txtype)
258 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
259 tx->tx_waiting ? "" : "NOT ",
260 tx->tx_msg->ibm_type, txtype);
266 kiblnd_handle_completion(struct kib_conn *conn, int txtype, int status, u64 cookie)
269 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
272 spin_lock(&conn->ibc_lock);
274 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
276 spin_unlock(&conn->ibc_lock);
278 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
279 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
280 kiblnd_close_conn(conn, -EPROTO);
284 if (tx->tx_status == 0) { /* success so far */
285 if (status < 0) { /* failed? */
286 tx->tx_status = status;
287 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
288 } else if (txtype == IBLND_MSG_GET_REQ) {
289 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
295 idle = !tx->tx_queued && (tx->tx_sending == 0);
297 list_del(&tx->tx_list);
299 spin_unlock(&conn->ibc_lock);
306 kiblnd_send_completion(struct kib_conn *conn, int type, int status, u64 cookie)
308 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
309 struct kib_tx *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
312 CERROR("Can't get tx for completion %x for %s\n",
313 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
317 tx->tx_msg->ibm_u.completion.ibcm_status = status;
318 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
319 kiblnd_init_tx_msg(ni, tx, type, sizeof(struct kib_completion_msg));
321 kiblnd_queue_tx(tx, conn);
325 kiblnd_handle_rx(struct kib_rx *rx)
327 struct kib_msg *msg = rx->rx_msg;
328 struct kib_conn *conn = rx->rx_conn;
329 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
330 int credits = msg->ibm_credits;
336 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
338 CDEBUG (D_NET, "Received %x[%d] from %s\n",
339 msg->ibm_type, credits,
340 libcfs_nid2str(conn->ibc_peer->ibp_nid));
343 /* Have I received credits that will let me send? */
344 spin_lock(&conn->ibc_lock);
346 if (conn->ibc_credits + credits >
347 conn->ibc_queue_depth) {
348 rc2 = conn->ibc_credits;
349 spin_unlock(&conn->ibc_lock);
351 CERROR("Bad credits from %s: %d + %d > %d\n",
352 libcfs_nid2str(conn->ibc_peer->ibp_nid),
354 conn->ibc_queue_depth);
356 kiblnd_close_conn(conn, -EPROTO);
357 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
361 conn->ibc_credits += credits;
363 /* This ensures the credit taken by NOOP can be returned */
364 if (msg->ibm_type == IBLND_MSG_NOOP &&
365 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
366 conn->ibc_outstanding_credits++;
368 kiblnd_check_sends_locked(conn);
369 spin_unlock(&conn->ibc_lock);
372 switch (msg->ibm_type) {
374 CERROR("Bad IBLND message type %x from %s\n",
375 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
376 post_credit = IBLND_POSTRX_NO_CREDIT;
381 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
382 post_credit = IBLND_POSTRX_NO_CREDIT;
386 if (credits != 0) /* credit already posted */
387 post_credit = IBLND_POSTRX_NO_CREDIT;
388 else /* a keepalive NOOP */
389 post_credit = IBLND_POSTRX_PEER_CREDIT;
392 case IBLND_MSG_IMMEDIATE:
393 post_credit = IBLND_POSTRX_DONT_POST;
394 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
395 msg->ibm_srcnid, rx, 0);
396 if (rc < 0) /* repost on error */
397 post_credit = IBLND_POSTRX_PEER_CREDIT;
400 case IBLND_MSG_PUT_REQ:
401 post_credit = IBLND_POSTRX_DONT_POST;
402 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
403 msg->ibm_srcnid, rx, 1);
404 if (rc < 0) /* repost on error */
405 post_credit = IBLND_POSTRX_PEER_CREDIT;
408 case IBLND_MSG_PUT_NAK:
409 CWARN ("PUT_NACK from %s\n",
410 libcfs_nid2str(conn->ibc_peer->ibp_nid));
411 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
412 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
413 msg->ibm_u.completion.ibcm_status,
414 msg->ibm_u.completion.ibcm_cookie);
417 case IBLND_MSG_PUT_ACK:
418 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
420 spin_lock(&conn->ibc_lock);
421 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
422 msg->ibm_u.putack.ibpam_src_cookie);
424 list_del(&tx->tx_list);
425 spin_unlock(&conn->ibc_lock);
428 CERROR("Unmatched PUT_ACK from %s\n",
429 libcfs_nid2str(conn->ibc_peer->ibp_nid));
434 LASSERT (tx->tx_waiting);
435 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
436 * (a) I can overwrite tx_msg since my peer_ni has received it!
437 * (b) tx_waiting set tells tx_complete() it's not done. */
439 tx->tx_nwrq = tx->tx_nsge = 0; /* overwrite PUT_REQ */
441 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
442 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
443 &msg->ibm_u.putack.ibpam_rd,
444 msg->ibm_u.putack.ibpam_dst_cookie);
446 CERROR("Can't setup rdma for PUT to %s: %d\n",
447 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
449 spin_lock(&conn->ibc_lock);
450 tx->tx_waiting = 0; /* clear waiting and queue atomically */
451 kiblnd_queue_tx_locked(tx, conn);
452 spin_unlock(&conn->ibc_lock);
455 case IBLND_MSG_PUT_DONE:
456 post_credit = IBLND_POSTRX_PEER_CREDIT;
457 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
458 msg->ibm_u.completion.ibcm_status,
459 msg->ibm_u.completion.ibcm_cookie);
462 case IBLND_MSG_GET_REQ:
463 post_credit = IBLND_POSTRX_DONT_POST;
464 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
465 msg->ibm_srcnid, rx, 1);
466 if (rc < 0) /* repost on error */
467 post_credit = IBLND_POSTRX_PEER_CREDIT;
470 case IBLND_MSG_GET_DONE:
471 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
472 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
473 msg->ibm_u.completion.ibcm_status,
474 msg->ibm_u.completion.ibcm_cookie);
478 if (rc < 0) /* protocol error */
479 kiblnd_close_conn(conn, rc);
481 if (post_credit != IBLND_POSTRX_DONT_POST)
482 kiblnd_post_rx(rx, post_credit);
486 kiblnd_rx_complete(struct kib_rx *rx, int status, int nob)
488 struct kib_msg *msg = rx->rx_msg;
489 struct kib_conn *conn = rx->rx_conn;
490 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
491 struct kib_net *net = ni->ni_data;
495 LASSERT (net != NULL);
496 LASSERT (rx->rx_nob < 0); /* was posted */
497 rx->rx_nob = 0; /* isn't now */
499 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
502 if (status != IB_WC_SUCCESS) {
503 CNETERR("Rx from %s failed: %d\n",
504 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
511 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
513 CERROR ("Error %d unpacking rx from %s\n",
514 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
518 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
519 msg->ibm_dstnid != ni->ni_nid ||
520 msg->ibm_srcstamp != conn->ibc_incarnation ||
521 msg->ibm_dststamp != net->ibn_incarnation) {
522 CERROR ("Stale rx from %s\n",
523 libcfs_nid2str(conn->ibc_peer->ibp_nid));
528 /* set time last known alive */
529 kiblnd_peer_alive(conn->ibc_peer);
531 /* racing with connection establishment/teardown! */
533 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
534 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
537 write_lock_irqsave(g_lock, flags);
538 /* must check holding global lock to eliminate race */
539 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
540 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
541 write_unlock_irqrestore(g_lock, flags);
544 write_unlock_irqrestore(g_lock, flags);
546 kiblnd_handle_rx(rx);
550 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
551 kiblnd_close_conn(conn, err);
553 kiblnd_drop_rx(rx); /* Don't re-post rx. */
557 kiblnd_fmr_map_tx(struct kib_net *net, struct kib_tx *tx,
558 struct kib_rdma_desc *rd, u32 nob)
560 struct kib_hca_dev *hdev;
562 struct kib_fmr_poolset *fps;
567 LASSERT(tx->tx_pool != NULL);
568 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
571 hdev = tx->tx_pool->tpo_hdev;
572 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
575 * If we're dealing with FastReg, but the device doesn't
576 * support GAPS and the tx has GAPS, then there is no real point
577 * in trying to map the memory, because it'll just fail. So
578 * preemptively fail with an appropriate message
580 if ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED) &&
581 !(dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT) &&
583 CERROR("Using FastReg with no GAPS support, but tx has gaps. "
584 "Try setting use_fastreg_gaps to 1\n");
585 return -EPROTONOSUPPORT;
588 #ifdef HAVE_FMR_POOL_API
590 * FMR does not support gaps but the tx has gaps then
591 * we should make sure that the number of fragments we'll be sending
592 * over fits within the number of fragments negotiated on the
593 * connection, otherwise, we won't be able to RDMA the data.
594 * We need to maintain the number of fragments negotiation on the
595 * connection for backwards compatibility.
597 if (tx->tx_gaps && (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)) {
599 tx->tx_conn->ibc_max_frags <= rd->rd_nfrags) {
600 CERROR("TX number of frags (%d) is <= than connection"
601 " number of frags (%d). Consider setting peer's"
602 " map_on_demand to 256\n", tx->tx_nfrags,
603 tx->tx_conn->ibc_max_frags);
609 fps = net->ibn_fmr_ps[cpt];
610 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
612 CERROR("Can't map %u bytes (%u/%u)s: %d\n", nob,
613 tx->tx_nfrags, rd->rd_nfrags, rc);
618 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
621 rd->rd_key = tx->tx_fmr.fmr_key;
623 * for FastReg or FMR with no gaps we can accumulate all
624 * the fragments in one FastReg or FMR fragment.
627 #ifdef HAVE_FMR_POOL_API
628 ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
631 (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
632 /* FMR requires zero based address */
633 #ifdef HAVE_FMR_POOL_API
634 if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
635 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
637 rd->rd_frags[0].rf_nob = nob;
641 * We're transmitting with gaps using FMR.
642 * We'll need to use multiple fragments and identify the
643 * zero based address of each fragment.
645 for (i = 0; i < rd->rd_nfrags; i++) {
646 rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
647 rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
655 kiblnd_unmap_tx(struct kib_tx *tx)
658 #ifdef HAVE_FMR_POOL_API
659 tx->tx_fmr.fmr_pfmr ||
662 kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);
664 if (tx->tx_nfrags != 0) {
665 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
666 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
671 #ifdef HAVE_IB_GET_DMA_MR
672 static struct ib_mr *
673 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, struct kib_rdma_desc *rd)
675 struct kib_net *net = ni->ni_data;
676 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
677 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
679 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
682 * if map-on-demand is turned on and the device supports
683 * either FMR or FastReg then use that. Otherwise use global
684 * memory regions. If that's not available either, then you're
685 * dead in the water and fail the operation.
687 if (tunables->lnd_map_on_demand &&
688 (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED
689 #ifdef HAVE_FMR_POOL_API
690 || net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED
696 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
697 * in the call chain. The mapping will fail with appropriate error
700 return hdev->ibh_mrs;
704 static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx,
705 struct kib_rdma_desc *rd, int nfrags)
707 struct kib_net *net = ni->ni_data;
708 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
709 #ifdef HAVE_IB_GET_DMA_MR
710 struct ib_mr *mr = NULL;
715 /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
717 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
718 tx->tx_nfrags = nfrags;
720 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
721 tx->tx_nfrags, tx->tx_dmadir);
723 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
724 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
725 hdev->ibh_ibdev, &tx->tx_frags[i]);
726 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
727 hdev->ibh_ibdev, &tx->tx_frags[i]);
728 nob += rd->rd_frags[i].rf_nob;
731 #ifdef HAVE_IB_GET_DMA_MR
732 mr = kiblnd_find_rd_dma_mr(ni, rd);
734 /* found pre-mapping MR */
735 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
740 if (net->ibn_fmr_ps != NULL)
741 return kiblnd_fmr_map_tx(net, tx, rd, nob);
746 static int kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
747 struct kib_rdma_desc *rd, int nkiov,
748 struct bio_vec *kiov, int offset, int nob)
750 struct kib_net *net = ni->ni_data;
751 struct scatterlist *sg;
755 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
759 LASSERT(net != NULL);
761 while (offset >= kiov->bv_len) {
762 offset -= kiov->bv_len;
774 fragnob = min((int)(kiov->bv_len - offset), nob);
777 * We're allowed to start at a non-aligned page offset in
778 * the first fragment and end at a non-aligned page offset
779 * in the last fragment.
781 if ((fragnob < (int)(kiov->bv_len - offset)) &&
782 nkiov < max_nkiov && nob > fragnob) {
783 CDEBUG(D_NET, "fragnob %d < available page %d: with"
784 " remaining %d kiovs with %d nob left\n",
785 fragnob, (int)(kiov->bv_len - offset),
790 sg_set_page(sg, kiov->bv_page, fragnob,
791 kiov->bv_offset + offset);
794 CERROR("lacking enough sg entries to map tx\n");
804 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
808 kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
809 __must_hold(&conn->ibc_lock)
811 struct kib_msg *msg = tx->tx_msg;
812 struct kib_peer_ni *peer_ni = conn->ibc_peer;
813 struct lnet_ni *ni = peer_ni->ibp_ni;
814 int ver = conn->ibc_version;
818 LASSERT(tx->tx_queued);
819 /* We rely on this for QP sizing */
820 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
821 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
823 LASSERT(credit == 0 || credit == 1);
824 LASSERT(conn->ibc_outstanding_credits >= 0);
825 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
826 LASSERT(conn->ibc_credits >= 0);
827 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
829 if (conn->ibc_nsends_posted ==
830 kiblnd_concurrent_sends(ver, ni)) {
831 /* tx completions outstanding... */
832 CDEBUG(D_NET, "%s: posted enough\n",
833 libcfs_nid2str(peer_ni->ibp_nid));
837 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
838 CDEBUG(D_NET, "%s: no credits\n",
839 libcfs_nid2str(peer_ni->ibp_nid));
843 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
844 conn->ibc_credits == 1 && /* last credit reserved */
845 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
846 CDEBUG(D_NET, "%s: not using last credit\n",
847 libcfs_nid2str(peer_ni->ibp_nid));
851 /* NB don't drop ibc_lock before bumping tx_sending */
852 list_del(&tx->tx_list);
855 if (msg->ibm_type == IBLND_MSG_NOOP &&
856 (!kiblnd_need_noop(conn) || /* redundant NOOP */
857 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
858 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
859 /* OK to drop when posted enough NOOPs, since
860 * kiblnd_check_sends_locked will queue NOOP again when
861 * posted NOOPs complete */
862 spin_unlock(&conn->ibc_lock);
863 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
865 spin_lock(&conn->ibc_lock);
866 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
867 libcfs_nid2str(peer_ni->ibp_nid),
868 conn->ibc_noops_posted);
872 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
873 peer_ni->ibp_nid, conn->ibc_incarnation);
875 conn->ibc_credits -= credit;
876 conn->ibc_outstanding_credits = 0;
877 conn->ibc_nsends_posted++;
878 if (msg->ibm_type == IBLND_MSG_NOOP)
879 conn->ibc_noops_posted++;
881 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
882 * PUT. If so, it was first queued here as a PUT_REQ, sent and
883 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
884 * and then re-queued here. It's (just) possible that
885 * tx_sending is non-zero if we've not done the tx_complete()
886 * from the first send; hence the ++ rather than = below. */
888 list_add(&tx->tx_list, &conn->ibc_active_txs);
890 /* I'm still holding ibc_lock! */
891 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
893 } else if (tx->tx_pool->tpo_pool.po_failed ||
894 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
895 /* close_conn will launch failover */
898 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
899 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
900 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
903 if (!frd->frd_valid) {
904 wr = &frd->frd_inv_wr.wr;
905 wr->next = &frd->frd_fastreg_wr.wr;
907 wr = &frd->frd_fastreg_wr.wr;
909 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
912 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
913 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
914 bad->wr_id, bad->opcode, bad->send_flags,
915 libcfs_nid2str(conn->ibc_peer->ibp_nid));
918 if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
921 #ifdef HAVE_IB_POST_SEND_RECV_CONST
922 rc = ib_post_send(conn->ibc_cmid->qp, wr,
923 (const struct ib_send_wr **)&bad);
925 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
929 conn->ibc_last_send = ktime_get();
934 /* NB credits are transferred in the actual
935 * message, which can only be the last work item */
936 conn->ibc_credits += credit;
937 conn->ibc_outstanding_credits += msg->ibm_credits;
938 conn->ibc_nsends_posted--;
939 if (msg->ibm_type == IBLND_MSG_NOOP)
940 conn->ibc_noops_posted--;
946 done = (tx->tx_sending == 0);
948 list_del(&tx->tx_list);
950 spin_unlock(&conn->ibc_lock);
952 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
953 CERROR("Error %d posting transmit to %s\n",
954 rc, libcfs_nid2str(peer_ni->ibp_nid));
956 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
957 rc, libcfs_nid2str(peer_ni->ibp_nid));
959 kiblnd_close_conn(conn, rc);
964 spin_lock(&conn->ibc_lock);
970 kiblnd_check_sends_locked(struct kib_conn *conn)
972 int ver = conn->ibc_version;
973 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
976 /* Don't send anything until after the connection is established */
977 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
978 CDEBUG(D_NET, "%s too soon\n",
979 libcfs_nid2str(conn->ibc_peer->ibp_nid));
983 LASSERT(conn->ibc_nsends_posted <=
984 kiblnd_concurrent_sends(ver, ni));
985 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
986 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
987 LASSERT (conn->ibc_reserved_credits >= 0);
989 while (conn->ibc_reserved_credits > 0 &&
990 (tx = list_first_entry_or_null(&conn->ibc_tx_queue_rsrvd,
991 struct kib_tx, tx_list)) != NULL) {
992 list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
993 conn->ibc_reserved_credits--;
996 if (kiblnd_need_noop(conn)) {
997 spin_unlock(&conn->ibc_lock);
999 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1001 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
1003 spin_lock(&conn->ibc_lock);
1005 kiblnd_queue_tx_locked(tx, conn);
1011 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1013 tx = list_first_entry(&conn->ibc_tx_queue_nocred,
1014 struct kib_tx, tx_list);
1015 } else if (!list_empty(&conn->ibc_tx_noops)) {
1016 LASSERT (!IBLND_OOB_CAPABLE(ver));
1018 tx = list_first_entry(&conn->ibc_tx_noops,
1019 struct kib_tx, tx_list);
1020 } else if (!list_empty(&conn->ibc_tx_queue)) {
1022 tx = list_first_entry(&conn->ibc_tx_queue,
1023 struct kib_tx, tx_list);
1027 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1033 kiblnd_tx_complete(struct kib_tx *tx, int status)
1035 int failed = (status != IB_WC_SUCCESS);
1036 struct kib_conn *conn = tx->tx_conn;
1039 if (tx->tx_sending <= 0) {
1040 CERROR("Received an event on a freed tx: %p status %d\n",
1046 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1047 CNETERR("Tx -> %s cookie %#llx"
1048 " sending %d waiting %d: failed %d\n",
1049 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1050 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1053 kiblnd_close_conn(conn, -EIO);
1055 kiblnd_peer_alive(conn->ibc_peer);
1058 spin_lock(&conn->ibc_lock);
1060 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1061 * gets to free it, which also drops its ref on 'conn'. */
1064 conn->ibc_nsends_posted--;
1065 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1066 conn->ibc_noops_posted--;
1069 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
1070 tx->tx_waiting = 0; /* don't wait for peer_ni */
1071 tx->tx_status = -EIO;
1074 idle = (tx->tx_sending == 0) && /* This is the final callback */
1075 !tx->tx_waiting && /* Not waiting for peer_ni */
1076 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1078 list_del(&tx->tx_list);
1080 kiblnd_check_sends_locked(conn);
1081 spin_unlock(&conn->ibc_lock);
1088 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1091 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1092 struct ib_sge *sge = &tx->tx_msgsge;
1093 struct ib_rdma_wr *wrq;
1094 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1095 #ifdef HAVE_IB_GET_DMA_MR
1096 struct ib_mr *mr = hdev->ibh_mrs;
1099 LASSERT(tx->tx_nwrq >= 0);
1100 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1101 LASSERT(nob <= IBLND_MSG_SIZE);
1102 #ifdef HAVE_IB_GET_DMA_MR
1103 LASSERT(mr != NULL);
1106 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1108 #ifdef HAVE_IB_GET_DMA_MR
1109 sge->lkey = mr->lkey;
1111 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1113 sge->addr = tx->tx_msgaddr;
1116 wrq = &tx->tx_wrq[tx->tx_nwrq];
1117 memset(wrq, 0, sizeof(*wrq));
1119 wrq->wr.next = NULL;
1120 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1121 wrq->wr.sg_list = sge;
1122 wrq->wr.num_sge = 1;
1123 wrq->wr.opcode = IB_WR_SEND;
1124 wrq->wr.send_flags = IB_SEND_SIGNALED;
1130 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1131 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
1133 struct kib_msg *ibmsg = tx->tx_msg;
1134 struct kib_rdma_desc *srcrd = tx->tx_rd;
1135 struct ib_rdma_wr *wrq = NULL;
1143 LASSERT(!in_interrupt());
1144 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1145 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1147 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1148 resid > 0; resid -= sge_nob) {
1151 if (srcidx >= srcrd->rd_nfrags) {
1152 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1157 if (dstidx >= dstrd->rd_nfrags) {
1158 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1163 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1164 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1165 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1166 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1167 conn->ibc_max_frags,
1168 srcidx, srcrd->rd_nfrags,
1169 dstidx, dstrd->rd_nfrags);
1174 sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1175 kiblnd_rd_frag_size(dstrd, dstidx),
1178 sge = &tx->tx_sge[tx->tx_nsge];
1179 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1180 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1181 sge->length = sge_nob;
1184 wrq = &tx->tx_wrq[tx->tx_nwrq];
1186 wrq->wr.next = &(wrq + 1)->wr;
1187 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1188 wrq->wr.sg_list = sge;
1189 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1190 wrq->wr.send_flags = 0;
1192 #ifdef HAVE_IB_RDMA_WR
1193 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1195 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1198 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1200 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1205 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1206 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1209 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1211 wrq->wr.num_sge = wrq_sge;
1217 if (rc < 0) /* no RDMA if completing with failure */
1218 tx->tx_nwrq = tx->tx_nsge = 0;
1220 ibmsg->ibm_u.completion.ibcm_status = rc;
1221 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1222 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1223 type, sizeof(struct kib_completion_msg));
1229 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1231 struct list_head *q;
1234 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1235 LASSERT(!tx->tx_queued); /* not queued for sending already */
1236 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1238 if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
1239 tx->tx_status = -ECONNABORTED;
1241 if (tx->tx_conn != NULL) {
1242 /* PUT_DONE first attached to conn as a PUT_REQ */
1243 LASSERT(tx->tx_conn == conn);
1244 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1246 kiblnd_conn_decref(conn);
1248 list_add(&tx->tx_list, &conn->ibc_zombie_txs);
1253 timeout_ns = kiblnd_timeout() * NSEC_PER_SEC;
1255 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1257 if (tx->tx_conn == NULL) {
1258 kiblnd_conn_addref(conn);
1260 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1262 /* PUT_DONE first attached to conn as a PUT_REQ */
1263 LASSERT (tx->tx_conn == conn);
1264 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1267 switch (tx->tx_msg->ibm_type) {
1271 case IBLND_MSG_PUT_REQ:
1272 case IBLND_MSG_GET_REQ:
1273 q = &conn->ibc_tx_queue_rsrvd;
1276 case IBLND_MSG_PUT_NAK:
1277 case IBLND_MSG_PUT_ACK:
1278 case IBLND_MSG_PUT_DONE:
1279 case IBLND_MSG_GET_DONE:
1280 q = &conn->ibc_tx_queue_nocred;
1283 case IBLND_MSG_NOOP:
1284 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1285 q = &conn->ibc_tx_queue_nocred;
1287 q = &conn->ibc_tx_noops;
1290 case IBLND_MSG_IMMEDIATE:
1291 q = &conn->ibc_tx_queue;
1295 list_add_tail(&tx->tx_list, q);
1299 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1301 spin_lock(&conn->ibc_lock);
1302 kiblnd_queue_tx_locked(tx, conn);
1303 kiblnd_check_sends_locked(conn);
1304 spin_unlock(&conn->ibc_lock);
1308 kiblnd_resolve_addr_cap(struct rdma_cm_id *cmid,
1309 struct sockaddr_in *srcaddr,
1310 struct sockaddr_in *dstaddr,
1313 unsigned short port;
1316 /* allow the port to be reused */
1317 rc = rdma_set_reuseaddr(cmid, 1);
1319 CERROR("Unable to set reuse on cmid: %d\n", rc);
1323 /* look for a free privileged port */
1324 for (port = PROT_SOCK-1; port > 0; port--) {
1325 srcaddr->sin_port = htons(port);
1326 rc = rdma_resolve_addr(cmid,
1327 (struct sockaddr *)srcaddr,
1328 (struct sockaddr *)dstaddr,
1331 CDEBUG(D_NET, "bound to port %hu\n", port);
1333 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1334 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1341 CERROR("cannot bind to a free privileged port: rc = %d\n", rc);
1347 kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1348 struct sockaddr_in *srcaddr,
1349 struct sockaddr_in *dstaddr,
1352 const struct cred *old_creds = NULL;
1353 struct cred *new_creds;
1356 if (!capable(CAP_NET_BIND_SERVICE)) {
1357 new_creds = prepare_kernel_cred(NULL);
1361 cap_raise(new_creds->cap_effective, CAP_NET_BIND_SERVICE);
1362 old_creds = override_creds(new_creds);
1365 rc = kiblnd_resolve_addr_cap(cmid, srcaddr, dstaddr, timeout_ms);
1368 revert_creds(old_creds);
1374 kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
1376 struct rdma_cm_id *cmid;
1377 struct kib_dev *dev;
1378 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1379 struct sockaddr_in srcaddr;
1380 struct sockaddr_in dstaddr;
1383 LASSERT (net != NULL);
1384 LASSERT (peer_ni->ibp_connecting > 0);
1386 cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
1387 kiblnd_cm_callback, peer_ni,
1388 RDMA_PS_TCP, IB_QPT_RC);
1391 CERROR("Can't create CMID for %s: %ld\n",
1392 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1398 memset(&srcaddr, 0, sizeof(srcaddr));
1399 srcaddr.sin_family = AF_INET;
1400 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1402 memset(&dstaddr, 0, sizeof(dstaddr));
1403 dstaddr.sin_family = AF_INET;
1404 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1405 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1407 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1409 if (*kiblnd_tunables.kib_use_priv_port) {
1410 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1411 kiblnd_timeout() * 1000);
1413 rc = rdma_resolve_addr(cmid,
1414 (struct sockaddr *)&srcaddr,
1415 (struct sockaddr *)&dstaddr,
1416 kiblnd_timeout() * 1000);
1419 /* Can't initiate address resolution: */
1420 CERROR("Can't resolve addr for %s: %d\n",
1421 libcfs_nid2str(peer_ni->ibp_nid), rc);
1428 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1429 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1430 rdma_destroy_id(cmid);
1433 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1437 kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
1439 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1440 char *reason = NULL;
1442 unsigned long flags;
1444 write_lock_irqsave(glock, flags);
1445 if (peer_ni->ibp_reconnecting == 0) {
1446 if (peer_ni->ibp_accepting)
1447 reason = "accepting";
1448 else if (peer_ni->ibp_connecting)
1449 reason = "connecting";
1450 else if (!list_empty(&peer_ni->ibp_conns))
1451 reason = "connected";
1452 else /* connected then closed */
1458 if (peer_ni->ibp_accepting)
1459 CNETERR("Detecting race between accepting and reconnecting\n");
1460 peer_ni->ibp_reconnecting--;
1462 if (!kiblnd_peer_active(peer_ni)) {
1463 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1464 reason = "unlinked";
1468 peer_ni->ibp_connecting++;
1469 peer_ni->ibp_reconnected++;
1471 write_unlock_irqrestore(glock, flags);
1473 kiblnd_connect_peer(peer_ni);
1477 write_unlock_irqrestore(glock, flags);
1479 CWARN("Abort reconnection of %s: %s\n",
1480 libcfs_nid2str(peer_ni->ibp_nid), reason);
1481 kiblnd_txlist_done(&txs, -ECONNABORTED,
1482 LNET_MSG_STATUS_LOCAL_ABORTED);
1487 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1489 struct kib_peer_ni *peer_ni;
1490 struct kib_peer_ni *peer2;
1491 struct kib_conn *conn;
1492 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1493 unsigned long flags;
1496 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1498 /* If I get here, I've committed to send, so I complete the tx with
1499 * failure on any problems
1502 LASSERT(!tx || !tx->tx_conn); /* only set when assigned a conn */
1503 LASSERT(!tx || tx->tx_nwrq > 0); /* work items have been set up */
1505 /* First time, just use a read lock since I expect to find my peer_ni
1508 read_lock_irqsave(g_lock, flags);
1510 peer_ni = kiblnd_find_peer_locked(ni, nid);
1511 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1512 /* Found a peer_ni with an established connection */
1513 conn = kiblnd_get_conn_locked(peer_ni);
1514 kiblnd_conn_addref(conn); /* 1 ref for me... */
1516 read_unlock_irqrestore(g_lock, flags);
1519 kiblnd_queue_tx(tx, conn);
1520 kiblnd_conn_decref(conn); /* ...to here */
1524 read_unlock(g_lock);
1525 /* Re-try with a write lock */
1528 peer_ni = kiblnd_find_peer_locked(ni, nid);
1529 if (peer_ni != NULL) {
1530 if (list_empty(&peer_ni->ibp_conns)) {
1531 /* found a peer_ni, but it's still connecting... */
1532 LASSERT(kiblnd_peer_connecting(peer_ni));
1534 list_add_tail(&tx->tx_list,
1535 &peer_ni->ibp_tx_queue);
1536 write_unlock_irqrestore(g_lock, flags);
1538 conn = kiblnd_get_conn_locked(peer_ni);
1539 kiblnd_conn_addref(conn); /* 1 ref for me... */
1541 write_unlock_irqrestore(g_lock, flags);
1544 kiblnd_queue_tx(tx, conn);
1545 kiblnd_conn_decref(conn); /* ...to here */
1550 write_unlock_irqrestore(g_lock, flags);
1552 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1553 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1555 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1557 tx->tx_status = -EHOSTUNREACH;
1559 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1565 write_lock_irqsave(g_lock, flags);
1567 peer2 = kiblnd_find_peer_locked(ni, nid);
1568 if (peer2 != NULL) {
1569 if (list_empty(&peer2->ibp_conns)) {
1570 /* found a peer_ni, but it's still connecting... */
1571 LASSERT(kiblnd_peer_connecting(peer2));
1573 list_add_tail(&tx->tx_list,
1574 &peer2->ibp_tx_queue);
1575 write_unlock_irqrestore(g_lock, flags);
1577 conn = kiblnd_get_conn_locked(peer2);
1578 kiblnd_conn_addref(conn); /* 1 ref for me... */
1580 write_unlock_irqrestore(g_lock, flags);
1583 kiblnd_queue_tx(tx, conn);
1584 kiblnd_conn_decref(conn); /* ...to here */
1587 kiblnd_peer_decref(peer_ni);
1591 /* Brand new peer_ni */
1592 LASSERT(peer_ni->ibp_connecting == 0);
1593 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1594 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1596 /* always called with a ref on ni, which prevents ni being shutdown */
1597 LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);
1600 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1602 kiblnd_peer_addref(peer_ni);
1603 hash_add(kiblnd_data.kib_peers, &peer_ni->ibp_list, nid);
1605 write_unlock_irqrestore(g_lock, flags);
1607 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1608 kiblnd_connect_peer(peer_ni);
1609 kiblnd_peer_decref(peer_ni);
1613 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1615 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1616 int type = lntmsg->msg_type;
1617 struct lnet_process_id target = lntmsg->msg_target;
1618 int target_is_router = lntmsg->msg_target_is_router;
1619 int routing = lntmsg->msg_routing;
1620 unsigned int payload_niov = lntmsg->msg_niov;
1621 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1622 unsigned int payload_offset = lntmsg->msg_offset;
1623 unsigned int payload_nob = lntmsg->msg_len;
1624 struct kib_msg *ibmsg;
1625 struct kib_rdma_desc *rd;
1630 /* NB 'private' is different depending on what we're sending.... */
1632 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1633 payload_nob, payload_niov, libcfs_id2str(target));
1635 LASSERT (payload_nob == 0 || payload_niov > 0);
1636 LASSERT (payload_niov <= LNET_MAX_IOV);
1638 /* Thread context */
1639 LASSERT (!in_interrupt());
1647 LASSERT (payload_nob == 0);
1651 if (routing || target_is_router)
1652 break; /* send IMMEDIATE */
1654 /* is the REPLY message too small for RDMA? */
1655 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1656 if (nob <= IBLND_MSG_SIZE)
1657 break; /* send IMMEDIATE */
1659 tx = kiblnd_get_idle_tx(ni, target.nid);
1661 CERROR("Can't allocate txd for GET to %s\n",
1662 libcfs_nid2str(target.nid));
1667 rd = &ibmsg->ibm_u.get.ibgm_rd;
1668 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1669 lntmsg->msg_md->md_niov,
1670 lntmsg->msg_md->md_kiov,
1671 0, lntmsg->msg_md->md_length);
1673 CERROR("Can't setup GET sink for %s: %d\n",
1674 libcfs_nid2str(target.nid), rc);
1675 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1680 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1681 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1682 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1684 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1686 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1687 if (tx->tx_lntmsg[1] == NULL) {
1688 CERROR("Can't create reply for GET -> %s\n",
1689 libcfs_nid2str(target.nid));
1694 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1695 tx->tx_waiting = 1; /* waiting for GET_DONE */
1696 kiblnd_launch_tx(ni, tx, target.nid);
1699 case LNET_MSG_REPLY:
1701 /* Is the payload small enough not to need RDMA? */
1702 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1703 if (nob <= IBLND_MSG_SIZE)
1704 break; /* send IMMEDIATE */
1706 tx = kiblnd_get_idle_tx(ni, target.nid);
1708 CERROR("Can't allocate %s txd for %s\n",
1709 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1710 libcfs_nid2str(target.nid));
1714 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1715 payload_niov, payload_kiov,
1716 payload_offset, payload_nob);
1718 CERROR("Can't setup PUT src for %s: %d\n",
1719 libcfs_nid2str(target.nid), rc);
1725 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1726 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1727 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
1728 sizeof(struct kib_putreq_msg));
1730 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1731 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1732 kiblnd_launch_tx(ni, tx, target.nid);
1736 /* send IMMEDIATE */
1737 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1740 tx = kiblnd_get_idle_tx(ni, target.nid);
1742 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1743 type, libcfs_nid2str(target.nid));
1748 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1750 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1751 offsetof(struct kib_msg,
1752 ibm_u.immediate.ibim_payload),
1753 payload_niov, payload_kiov,
1754 payload_offset, payload_nob);
1756 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1757 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1759 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1760 kiblnd_launch_tx(ni, tx, target.nid);
1765 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1767 struct lnet_process_id target = lntmsg->msg_target;
1768 unsigned int niov = lntmsg->msg_niov;
1769 struct bio_vec *kiov = lntmsg->msg_kiov;
1770 unsigned int offset = lntmsg->msg_offset;
1771 unsigned int nob = lntmsg->msg_len;
1775 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1777 CERROR("Can't get tx for REPLY to %s\n",
1778 libcfs_nid2str(target.nid));
1785 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1786 niov, kiov, offset, nob);
1789 CERROR("Can't setup GET src for %s: %d\n",
1790 libcfs_nid2str(target.nid), rc);
1794 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1795 IBLND_MSG_GET_DONE, nob,
1796 &rx->rx_msg->ibm_u.get.ibgm_rd,
1797 rx->rx_msg->ibm_u.get.ibgm_cookie);
1799 CERROR("Can't setup rdma for GET from %s: %d\n",
1800 libcfs_nid2str(target.nid), rc);
1805 /* No RDMA: local completion may happen now! */
1806 lnet_finalize(lntmsg, 0);
1808 /* RDMA: lnet_finalize(lntmsg) when it
1810 tx->tx_lntmsg[0] = lntmsg;
1813 kiblnd_queue_tx(tx, rx->rx_conn);
1818 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1821 lnet_finalize(lntmsg, -EIO);
1825 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1826 int delayed, unsigned int niov, struct bio_vec *kiov,
1827 unsigned int offset, unsigned int mlen, unsigned int rlen)
1829 struct kib_rx *rx = private;
1830 struct kib_msg *rxmsg = rx->rx_msg;
1831 struct kib_conn *conn = rx->rx_conn;
1835 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1838 LASSERT (mlen <= rlen);
1839 LASSERT (!in_interrupt());
1841 switch (rxmsg->ibm_type) {
1845 case IBLND_MSG_IMMEDIATE:
1846 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1847 if (nob > rx->rx_nob) {
1848 CERROR ("Immediate message from %s too big: %d(%d)\n",
1849 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1855 lnet_copy_flat2kiov(niov, kiov, offset,
1856 IBLND_MSG_SIZE, rxmsg,
1857 offsetof(struct kib_msg,
1858 ibm_u.immediate.ibim_payload),
1860 lnet_finalize(lntmsg, 0);
1863 case IBLND_MSG_PUT_REQ: {
1864 struct kib_msg *txmsg;
1865 struct kib_rdma_desc *rd;
1866 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1869 lnet_finalize(lntmsg, 0);
1870 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1875 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1877 CERROR("Can't allocate tx for %s\n",
1878 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1879 /* Not replying will break the connection */
1885 rd = &txmsg->ibm_u.putack.ibpam_rd;
1886 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1887 niov, kiov, offset, mlen);
1889 CERROR("Can't setup PUT sink for %s: %d\n",
1890 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1891 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1893 /* tell peer_ni it's over */
1894 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1899 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1900 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1901 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1903 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1905 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1906 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1907 kiblnd_queue_tx(tx, conn);
1909 /* reposted buffer reserved for PUT_DONE */
1910 post_credit = IBLND_POSTRX_NO_CREDIT;
1914 case IBLND_MSG_GET_REQ:
1915 if (lntmsg != NULL) {
1916 /* Optimized GET; RDMA lntmsg's payload */
1917 kiblnd_reply(ni, rx, lntmsg);
1919 /* GET didn't match anything */
1920 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1922 rxmsg->ibm_u.get.ibgm_cookie);
1927 kiblnd_post_rx(rx, post_credit);
1932 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1934 struct task_struct *task = kthread_run(fn, arg, "%s", name);
1937 return PTR_ERR(task);
1939 atomic_inc(&kiblnd_data.kib_nthreads);
1944 kiblnd_thread_fini (void)
1946 atomic_dec (&kiblnd_data.kib_nthreads);
1950 kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
1952 /* This is racy, but everyone's only writing ktime_get_seconds() */
1953 peer_ni->ibp_last_alive = ktime_get_seconds();
1958 kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
1961 time64_t last_alive = 0;
1962 unsigned long flags;
1964 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1966 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1967 error = peer_ni->ibp_error;
1968 peer_ni->ibp_error = 0;
1970 last_alive = peer_ni->ibp_last_alive;
1973 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1976 lnet_notify(peer_ni->ibp_ni,
1977 peer_ni->ibp_nid, false, false, last_alive);
1981 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
1983 /* This just does the immediate housekeeping. 'error' is zero for a
1984 * normal shutdown which can happen only after the connection has been
1985 * established. If the connection is established, schedule the
1986 * connection to be finished off by the connd. Otherwise the connd is
1987 * already dealing with it (either to set it up or tear it down).
1988 * Caller holds kib_global_lock exclusively in irq context */
1989 struct kib_peer_ni *peer_ni = conn->ibc_peer;
1990 struct kib_dev *dev;
1991 unsigned long flags;
1993 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1995 if (error != 0 && conn->ibc_comms_error == 0)
1996 conn->ibc_comms_error = error;
1998 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1999 return; /* already being handled */
2002 list_empty(&conn->ibc_tx_noops) &&
2003 list_empty(&conn->ibc_tx_queue) &&
2004 list_empty(&conn->ibc_tx_queue_rsrvd) &&
2005 list_empty(&conn->ibc_tx_queue_nocred) &&
2006 list_empty(&conn->ibc_active_txs)) {
2007 CDEBUG(D_NET, "closing conn to %s\n",
2008 libcfs_nid2str(peer_ni->ibp_nid));
2010 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
2011 libcfs_nid2str(peer_ni->ibp_nid), error,
2012 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
2013 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
2014 list_empty(&conn->ibc_tx_queue_rsrvd) ?
2015 "" : "(sending_rsrvd)",
2016 list_empty(&conn->ibc_tx_queue_nocred) ?
2017 "" : "(sending_nocred)",
2018 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
2021 dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
2022 if (peer_ni->ibp_next_conn == conn)
2023 /* clear next_conn so it won't be used */
2024 peer_ni->ibp_next_conn = NULL;
2025 list_del(&conn->ibc_list);
2026 /* connd (see below) takes over ibc_list's ref */
2028 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
2029 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
2030 kiblnd_unlink_peer_locked(peer_ni);
2032 /* set/clear error on last conn */
2033 peer_ni->ibp_error = conn->ibc_comms_error;
2036 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
2039 kiblnd_dev_can_failover(dev)) {
2040 list_add_tail(&dev->ibd_fail_list,
2041 &kiblnd_data.kib_failed_devs);
2042 wake_up(&kiblnd_data.kib_failover_waitq);
2045 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2047 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2048 wake_up(&kiblnd_data.kib_connd_waitq);
2050 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2054 kiblnd_close_conn(struct kib_conn *conn, int error)
2056 unsigned long flags;
2058 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2060 kiblnd_close_conn_locked(conn, error);
2062 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2066 kiblnd_handle_early_rxs(struct kib_conn *conn)
2068 unsigned long flags;
2071 LASSERT(!in_interrupt());
2072 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2074 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2075 while ((rx = list_first_entry_or_null(&conn->ibc_early_rxs,
2077 rx_list)) != NULL) {
2078 list_del(&rx->rx_list);
2079 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2081 kiblnd_handle_rx(rx);
2083 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2085 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2089 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
2095 spin_lock(&conn->ibc_lock);
2097 list_for_each_entry_safe(tx, nxt, txs, tx_list) {
2098 if (txs == &conn->ibc_active_txs) {
2099 LASSERT(!tx->tx_queued);
2100 LASSERT(tx->tx_waiting ||
2101 tx->tx_sending != 0);
2102 if (conn->ibc_comms_error == -ETIMEDOUT) {
2103 if (tx->tx_waiting && !tx->tx_sending)
2105 LNET_MSG_STATUS_REMOTE_TIMEOUT;
2106 else if (tx->tx_sending)
2108 LNET_MSG_STATUS_NETWORK_TIMEOUT;
2111 LASSERT(tx->tx_queued);
2112 if (conn->ibc_comms_error == -ETIMEDOUT)
2113 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2115 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
2118 tx->tx_status = -ECONNABORTED;
2122 * TODO: This makes an assumption that
2123 * kiblnd_tx_complete() will be called for each tx. If
2124 * that event is dropped we could end up with stale
2125 * connections floating around. We'd like to deal with
2126 * that in a better way.
2128 * Also that means we can exceed the timeout by many
2131 if (tx->tx_sending == 0) {
2133 list_move(&tx->tx_list, &zombies);
2135 /* keep tx until cq destroy */
2136 list_move(&tx->tx_list, &conn->ibc_zombie_txs);
2141 spin_unlock(&conn->ibc_lock);
2144 * aborting transmits occurs when finalizing the connection.
2145 * The connection is finalized on error.
2146 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
2147 * override the value already set in tx->tx_hstatus above.
2149 kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
2153 kiblnd_tx_may_discard(struct kib_conn *conn)
2159 spin_lock(&conn->ibc_lock);
2161 list_for_each_entry_safe(tx, nxt, &conn->ibc_zombie_txs, tx_list) {
2162 if (tx->tx_sending > 0 && tx->tx_lntmsg[0] &&
2163 lnet_md_discarded(tx->tx_lntmsg[0]->msg_md)) {
2165 if (tx->tx_sending == 0) {
2166 kiblnd_conn_decref(tx->tx_conn);
2173 spin_unlock(&conn->ibc_lock);
2178 kiblnd_finalise_conn(struct kib_conn *conn)
2180 LASSERT (!in_interrupt());
2181 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2183 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2184 * for connections that didn't get as far as being connected, because
2185 * rdma_disconnect() does this for free. */
2186 kiblnd_abort_receives(conn);
2188 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2190 /* Complete all tx descs not waiting for sends to complete.
2191 * NB we should be safe from RDMA now that the QP has changed state */
2193 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2194 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2195 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2196 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2197 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2199 kiblnd_handle_early_rxs(conn);
2203 kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
2207 unsigned long flags;
2208 enum lnet_msg_hstatus hstatus;
2210 LASSERT(error != 0);
2211 LASSERT(!in_interrupt());
2213 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2216 LASSERT(peer_ni->ibp_connecting > 0);
2217 peer_ni->ibp_connecting--;
2219 LASSERT (peer_ni->ibp_accepting > 0);
2220 peer_ni->ibp_accepting--;
2223 if (kiblnd_peer_connecting(peer_ni)) {
2224 /* another connection attempt under way... */
2225 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2230 peer_ni->ibp_reconnected = 0;
2231 if (list_empty(&peer_ni->ibp_conns)) {
2232 /* Take peer_ni's blocked transmits to complete with error */
2233 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2235 if (kiblnd_peer_active(peer_ni))
2236 kiblnd_unlink_peer_locked(peer_ni);
2238 peer_ni->ibp_error = error;
2240 /* Can't have blocked transmits if there are connections */
2241 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2244 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2246 kiblnd_peer_notify(peer_ni);
2248 if (list_empty(&zombies))
2251 CNETERR("Deleting messages for %s: connection failed\n",
2252 libcfs_nid2str(peer_ni->ibp_nid));
2257 hstatus = LNET_MSG_STATUS_NETWORK_TIMEOUT;
2260 hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
2263 hstatus = LNET_MSG_STATUS_LOCAL_DROPPED;
2267 kiblnd_txlist_done(&zombies, error, hstatus);
2271 kiblnd_connreq_done(struct kib_conn *conn, int status)
2273 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2276 unsigned long flags;
2279 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2281 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2282 libcfs_nid2str(peer_ni->ibp_nid), active,
2283 conn->ibc_version, status);
2285 LASSERT (!in_interrupt());
2286 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2287 peer_ni->ibp_connecting > 0) ||
2288 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2289 peer_ni->ibp_accepting > 0));
2291 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2292 conn->ibc_connvars = NULL;
2295 /* failed to establish connection */
2296 kiblnd_peer_connect_failed(peer_ni, active, status);
2297 kiblnd_finalise_conn(conn);
2301 /* connection established */
2302 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2304 conn->ibc_last_send = ktime_get();
2305 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2306 kiblnd_peer_alive(peer_ni);
2308 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2309 * peer_ni instance... */
2310 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2311 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2312 peer_ni->ibp_reconnected = 0;
2314 peer_ni->ibp_connecting--;
2316 peer_ni->ibp_accepting--;
2318 if (peer_ni->ibp_version == 0) {
2319 peer_ni->ibp_version = conn->ibc_version;
2320 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2323 if (peer_ni->ibp_version != conn->ibc_version ||
2324 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2325 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2326 conn->ibc_incarnation);
2327 peer_ni->ibp_version = conn->ibc_version;
2328 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2331 /* grab pending txs while I have the lock */
2332 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2334 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2335 conn->ibc_comms_error != 0) { /* error has happened already */
2337 /* start to shut down connection */
2338 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2339 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2341 kiblnd_txlist_done(&txs, -ECONNABORTED,
2342 LNET_MSG_STATUS_LOCAL_ERROR);
2347 /* +1 ref for myself, this connection is visible to other threads
2348 * now, refcount of peer:ibp_conns can be released by connection
2349 * close from either a different thread, or the calling of
2350 * kiblnd_check_sends_locked() below. See bz21911 for details.
2352 kiblnd_conn_addref(conn);
2353 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2355 /* Schedule blocked txs
2356 * Note: if we are running with conns_per_peer > 1, these blocked
2357 * txs will all get scheduled to the first connection which gets
2358 * scheduled. We won't be using round robin on this first batch.
2360 spin_lock(&conn->ibc_lock);
2361 while ((tx = list_first_entry_or_null(&txs, struct kib_tx,
2362 tx_list)) != NULL) {
2363 list_del(&tx->tx_list);
2365 kiblnd_queue_tx_locked(tx, conn);
2367 kiblnd_check_sends_locked(conn);
2368 spin_unlock(&conn->ibc_lock);
2370 /* schedule blocked rxs */
2371 kiblnd_handle_early_rxs(conn);
2372 kiblnd_conn_decref(conn);
2376 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2380 #ifdef HAVE_RDMA_REJECT_4ARGS
2381 rc = rdma_reject(cmid, rej, sizeof(*rej), IB_CM_REJ_CONSUMER_DEFINED);
2383 rc = rdma_reject(cmid, rej, sizeof(*rej));
2387 CWARN("Error %d sending reject\n", rc);
2391 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2393 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2394 struct kib_msg *reqmsg = priv;
2395 struct kib_msg *ackmsg;
2396 struct kib_dev *ibdev;
2397 struct kib_peer_ni *peer_ni;
2398 struct kib_peer_ni *peer2;
2399 struct kib_conn *conn;
2400 struct lnet_ni *ni = NULL;
2401 struct kib_net *net = NULL;
2403 struct rdma_conn_param cp;
2405 int version = IBLND_MSG_VERSION;
2406 unsigned long flags;
2408 struct sockaddr_in *peer_addr;
2410 LASSERT(!in_interrupt());
2411 /* cmid inherits 'context' from the corresponding listener id */
2412 ibdev = cmid->context;
2415 memset(&rej, 0, sizeof(rej));
2416 rej.ibr_magic = IBLND_MSG_MAGIC;
2417 rej.ibr_why = IBLND_REJECT_FATAL;
2418 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2420 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2421 if (*kiblnd_tunables.kib_require_priv_port &&
2422 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2423 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2424 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2425 &ip, ntohs(peer_addr->sin_port));
2429 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2430 CERROR("Short connection request\n");
2434 /* Future protocol version compatibility support! If the
2435 * o2iblnd-specific protocol changes, or when LNET unifies
2436 * protocols over all LNDs, the initial connection will
2437 * negotiate a protocol version. I trap this here to avoid
2438 * console errors; the reject tells the peer_ni which protocol I
2440 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2441 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2443 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2444 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2445 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2447 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2448 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2449 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2452 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2454 CERROR("Can't parse connection request: %d\n", rc);
2458 nid = reqmsg->ibm_srcnid;
2459 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2462 net = (struct kib_net *)ni->ni_data;
2463 rej.ibr_incarnation = net->ibn_incarnation;
2466 if (ni == NULL || /* no matching net */
2467 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2468 net->ibn_dev != ibdev) { /* wrong device */
2469 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): bad dst nid %s\n", libcfs_nid2str(nid),
2470 ni ? libcfs_nid2str(ni->ni_nid) : "NA",
2471 ibdev->ibd_ifname, ibdev->ibd_nnets,
2473 libcfs_nid2str(reqmsg->ibm_dstnid));
2478 /* check time stamp as soon as possible */
2479 if (reqmsg->ibm_dststamp != 0 &&
2480 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2481 CWARN("Stale connection request\n");
2482 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2486 /* I can accept peer_ni's version */
2487 version = reqmsg->ibm_version;
2489 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2490 CERROR("Unexpected connreq msg type: %x from %s\n",
2491 reqmsg->ibm_type, libcfs_nid2str(nid));
2495 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2496 kiblnd_msg_queue_size(version, ni)) {
2497 CERROR("Can't accept conn from %s, queue depth too large: %d (<=%d wanted)\n",
2498 libcfs_nid2str(nid),
2499 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2500 kiblnd_msg_queue_size(version, ni));
2502 if (version == IBLND_MSG_VERSION)
2503 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2508 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2509 IBLND_MAX_RDMA_FRAGS) {
2510 CWARN("Can't accept conn from %s (version %x): max_frags %d too large (%d wanted)\n",
2511 libcfs_nid2str(nid), version,
2512 reqmsg->ibm_u.connparams.ibcp_max_frags,
2513 IBLND_MAX_RDMA_FRAGS);
2515 if (version >= IBLND_MSG_VERSION)
2516 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2519 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2520 IBLND_MAX_RDMA_FRAGS &&
2521 net->ibn_fmr_ps == NULL) {
2522 CWARN("Can't accept conn from %s (version %x): max_frags %d incompatible without FMR pool (%d wanted)\n",
2523 libcfs_nid2str(nid), version,
2524 reqmsg->ibm_u.connparams.ibcp_max_frags,
2525 IBLND_MAX_RDMA_FRAGS);
2527 if (version == IBLND_MSG_VERSION)
2528 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2533 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2534 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2535 libcfs_nid2str(nid),
2536 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2541 /* assume 'nid' is a new peer_ni; create */
2542 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2544 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2545 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2549 /* We have validated the peer's parameters so use those */
2550 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2551 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2553 write_lock_irqsave(g_lock, flags);
2555 peer2 = kiblnd_find_peer_locked(ni, nid);
2556 if (peer2 != NULL) {
2557 if (peer2->ibp_version == 0) {
2558 peer2->ibp_version = version;
2559 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2562 /* not the guy I've talked with */
2563 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2564 peer2->ibp_version != version) {
2565 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2567 if (kiblnd_peer_active(peer2)) {
2568 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2569 peer2->ibp_version = version;
2571 write_unlock_irqrestore(g_lock, flags);
2573 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2574 libcfs_nid2str(nid), peer2->ibp_version, version,
2575 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2577 kiblnd_peer_decref(peer_ni);
2578 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2582 /* Tie-break connection race in favour of the higher NID.
2583 * If we keep running into a race condition multiple times,
2584 * we have to assume that the connection attempt with the
2585 * higher NID is stuck in a connecting state and will never
2586 * recover. As such, we pass through this if-block and let
2587 * the lower NID connection win so we can move forward.
2589 if (peer2->ibp_connecting != 0 &&
2590 nid < ni->ni_nid && peer2->ibp_races <
2591 MAX_CONN_RACES_BEFORE_ABORT) {
2593 write_unlock_irqrestore(g_lock, flags);
2595 CDEBUG(D_NET, "Conn race %s\n",
2596 libcfs_nid2str(peer2->ibp_nid));
2598 kiblnd_peer_decref(peer_ni);
2599 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2602 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2603 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2604 libcfs_nid2str(peer2->ibp_nid),
2605 MAX_CONN_RACES_BEFORE_ABORT);
2607 * passive connection is allowed even this peer_ni is waiting for
2610 peer2->ibp_reconnecting = 0;
2611 peer2->ibp_races = 0;
2612 peer2->ibp_accepting++;
2613 kiblnd_peer_addref(peer2);
2615 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2616 * so copy validated parameters since we now know what the
2617 * peer_ni's limits are */
2618 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2619 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2621 write_unlock_irqrestore(g_lock, flags);
2622 kiblnd_peer_decref(peer_ni);
2625 /* Brand new peer_ni */
2626 LASSERT(peer_ni->ibp_accepting == 0);
2627 LASSERT(peer_ni->ibp_version == 0 &&
2628 peer_ni->ibp_incarnation == 0);
2630 peer_ni->ibp_accepting = 1;
2631 peer_ni->ibp_version = version;
2632 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2634 /* I have a ref on ni that prevents it being shutdown */
2635 LASSERT(net->ibn_shutdown == 0);
2637 kiblnd_peer_addref(peer_ni);
2638 hash_add(kiblnd_data.kib_peers, &peer_ni->ibp_list, nid);
2640 write_unlock_irqrestore(g_lock, flags);
2643 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT,
2646 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2647 kiblnd_peer_decref(peer_ni);
2648 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2652 /* conn now "owns" cmid, so I return success from here on to ensure the
2653 * CM callback doesn't destroy cmid.
2655 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2656 conn->ibc_credits = conn->ibc_queue_depth;
2657 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2658 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2659 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2661 ackmsg = &conn->ibc_connvars->cv_msg;
2662 memset(ackmsg, 0, sizeof(*ackmsg));
2664 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2665 sizeof(ackmsg->ibm_u.connparams));
2666 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2667 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2668 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2670 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2672 memset(&cp, 0, sizeof(cp));
2673 cp.private_data = ackmsg;
2674 cp.private_data_len = ackmsg->ibm_nob;
2675 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2676 cp.initiator_depth = 0;
2677 cp.flow_control = 1;
2678 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2679 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2681 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2683 rc = rdma_accept(cmid, &cp);
2685 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2686 rej.ibr_version = version;
2687 rej.ibr_why = IBLND_REJECT_FATAL;
2689 kiblnd_reject(cmid, &rej);
2690 kiblnd_connreq_done(conn, rc);
2691 kiblnd_conn_decref(conn);
2699 rej.ibr_cp.ibcp_queue_depth =
2700 kiblnd_msg_queue_size(version, ni);
2701 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2705 rej.ibr_version = version;
2706 kiblnd_reject(cmid, &rej);
2708 return -ECONNREFUSED;
2712 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2713 u64 incarnation, int why, struct kib_connparams *cp)
2715 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2716 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2718 int msg_size = IBLND_MSG_SIZE;
2722 unsigned long flags;
2724 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2725 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2728 msg_size = cp->ibcp_max_msg_size;
2729 frag_num = cp->ibcp_max_frags;
2730 queue_dep = cp->ibcp_queue_depth;
2733 write_lock_irqsave(glock, flags);
2734 /* retry connection if it's still needed and no other connection
2735 * attempts (active or passive) are in progress
2736 * NB: reconnect is still needed even when ibp_tx_queue is
2737 * empty if ibp_version != version because reconnect may be
2740 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2741 peer_ni->ibp_version != version) &&
2742 peer_ni->ibp_connecting &&
2743 peer_ni->ibp_accepting == 0;
2754 case IBLND_REJECT_RDMA_FRAGS: {
2755 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2758 reason = "can't negotiate max frags";
2761 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2762 #ifdef HAVE_IB_GET_DMA_MR
2764 * This check only makes sense if the kernel supports global
2765 * memory registration. Otherwise, map_on_demand will never == 0
2767 if (!tunables->lnd_map_on_demand) {
2768 reason = "map_on_demand must be enabled";
2772 if (conn->ibc_max_frags <= frag_num) {
2773 reason = "unsupported max frags";
2777 peer_ni->ibp_max_frags = frag_num;
2778 reason = "rdma fragments";
2781 case IBLND_REJECT_MSG_QUEUE_SIZE:
2783 reason = "can't negotiate queue depth";
2786 if (conn->ibc_queue_depth <= queue_dep) {
2787 reason = "unsupported queue depth";
2791 peer_ni->ibp_queue_depth = queue_dep;
2792 reason = "queue depth";
2795 case IBLND_REJECT_CONN_STALE:
2799 case IBLND_REJECT_CONN_RACE:
2800 reason = "conn race";
2803 case IBLND_REJECT_CONN_UNCOMPAT:
2804 reason = "version negotiation";
2808 conn->ibc_reconnect = 1;
2809 peer_ni->ibp_reconnecting++;
2810 peer_ni->ibp_version = version;
2811 if (incarnation != 0)
2812 peer_ni->ibp_incarnation = incarnation;
2814 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2816 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2817 libcfs_nid2str(peer_ni->ibp_nid),
2818 reconnect ? "reconnect" : "don't reconnect",
2819 reason, IBLND_MSG_VERSION, version, msg_size,
2820 conn->ibc_queue_depth, queue_dep,
2821 conn->ibc_max_frags, frag_num);
2823 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2824 * while destroying the zombie
2829 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2831 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2832 int status = -ECONNREFUSED;
2834 LASSERT (!in_interrupt());
2835 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2838 case IB_CM_REJ_STALE_CONN:
2839 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2840 IBLND_REJECT_CONN_STALE, NULL);
2843 case IB_CM_REJ_INVALID_SERVICE_ID:
2844 status = -EHOSTUNREACH;
2845 CNETERR("%s rejected: no listener at %d\n",
2846 libcfs_nid2str(peer_ni->ibp_nid),
2847 *kiblnd_tunables.kib_service);
2850 case IB_CM_REJ_CONSUMER_DEFINED:
2851 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2852 struct kib_rej *rej = priv;
2853 struct kib_connparams *cp = NULL;
2855 __u64 incarnation = -1;
2857 /* NB. default incarnation is -1 because:
2858 * a) V1 will ignore dst incarnation in connreq.
2859 * b) V2 will provide incarnation while rejecting me,
2860 * -1 will be overwrote.
2862 * if I try to connect to a V1 peer_ni with V2 protocol,
2863 * it rejected me then upgrade to V2, I have no idea
2864 * about the upgrading and try to reconnect with V1,
2865 * in this case upgraded V2 can find out I'm trying to
2866 * talk to the old guy and reject me(incarnation is -1).
2869 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2870 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2871 __swab32s(&rej->ibr_magic);
2872 __swab16s(&rej->ibr_version);
2876 if (priv_nob >= sizeof(struct kib_rej) &&
2877 rej->ibr_version > IBLND_MSG_VERSION_1) {
2878 /* priv_nob is always 148 in current version
2879 * of OFED, so we still need to check version.
2880 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE)
2885 __swab64s(&rej->ibr_incarnation);
2886 __swab16s(&cp->ibcp_queue_depth);
2887 __swab16s(&cp->ibcp_max_frags);
2888 __swab32s(&cp->ibcp_max_msg_size);
2891 incarnation = rej->ibr_incarnation;
2894 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2895 rej->ibr_magic != LNET_PROTO_MAGIC) {
2896 CERROR("%s rejected: consumer defined fatal error\n",
2897 libcfs_nid2str(peer_ni->ibp_nid));
2901 if (rej->ibr_version != IBLND_MSG_VERSION &&
2902 rej->ibr_version != IBLND_MSG_VERSION_1) {
2903 CERROR("%s rejected: o2iblnd version %x error\n",
2904 libcfs_nid2str(peer_ni->ibp_nid),
2909 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2910 rej->ibr_version == IBLND_MSG_VERSION_1) {
2911 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2912 libcfs_nid2str(peer_ni->ibp_nid),
2915 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2916 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2919 switch (rej->ibr_why) {
2920 case IBLND_REJECT_CONN_RACE:
2921 case IBLND_REJECT_CONN_STALE:
2922 case IBLND_REJECT_CONN_UNCOMPAT:
2923 case IBLND_REJECT_MSG_QUEUE_SIZE:
2924 case IBLND_REJECT_RDMA_FRAGS:
2925 kiblnd_check_reconnect(conn, rej->ibr_version,
2930 case IBLND_REJECT_NO_RESOURCES:
2931 CERROR("%s rejected: o2iblnd no resources\n",
2932 libcfs_nid2str(peer_ni->ibp_nid));
2935 case IBLND_REJECT_FATAL:
2936 CERROR("%s rejected: o2iblnd fatal error\n",
2937 libcfs_nid2str(peer_ni->ibp_nid));
2941 CERROR("%s rejected: o2iblnd reason %d\n",
2942 libcfs_nid2str(peer_ni->ibp_nid),
2950 CNETERR("%s rejected: reason %d, size %d\n",
2951 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2955 kiblnd_connreq_done(conn, status);
2959 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2961 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2962 struct lnet_ni *ni = peer_ni->ibp_ni;
2963 struct kib_net *net = ni->ni_data;
2964 struct kib_msg *msg = priv;
2965 int ver = conn->ibc_version;
2966 int rc = kiblnd_unpack_msg(msg, priv_nob);
2967 unsigned long flags;
2969 LASSERT (net != NULL);
2972 CERROR("Can't unpack connack from %s: %d\n",
2973 libcfs_nid2str(peer_ni->ibp_nid), rc);
2977 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2978 CERROR("Unexpected message %d from %s\n",
2979 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2984 if (ver != msg->ibm_version) {
2985 CERROR("%s replied version %x is different with "
2986 "requested version %x\n",
2987 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2992 if (msg->ibm_u.connparams.ibcp_queue_depth >
2993 conn->ibc_queue_depth) {
2994 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2995 libcfs_nid2str(peer_ni->ibp_nid),
2996 msg->ibm_u.connparams.ibcp_queue_depth,
2997 conn->ibc_queue_depth);
3002 if (msg->ibm_u.connparams.ibcp_max_frags >
3003 conn->ibc_max_frags) {
3004 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
3005 libcfs_nid2str(peer_ni->ibp_nid),
3006 msg->ibm_u.connparams.ibcp_max_frags,
3007 conn->ibc_max_frags);
3012 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
3013 CERROR("%s max message size %d too big (%d max)\n",
3014 libcfs_nid2str(peer_ni->ibp_nid),
3015 msg->ibm_u.connparams.ibcp_max_msg_size,
3021 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3022 if (msg->ibm_dstnid == ni->ni_nid &&
3023 msg->ibm_dststamp == net->ibn_incarnation)
3027 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3030 CERROR("Bad connection reply from %s, rc = %d, "
3031 "version: %x max_frags: %d\n",
3032 libcfs_nid2str(peer_ni->ibp_nid), rc,
3033 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
3037 conn->ibc_incarnation = msg->ibm_srcstamp;
3038 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
3039 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
3040 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
3041 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
3042 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
3043 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
3045 kiblnd_connreq_done(conn, 0);
3049 /* NB My QP has already established itself, so I handle anything going
3050 * wrong here by setting ibc_comms_error.
3051 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
3052 * immediately tears it down. */
3055 conn->ibc_comms_error = rc;
3056 kiblnd_connreq_done(conn, 0);
3060 kiblnd_active_connect(struct rdma_cm_id *cmid)
3062 struct kib_peer_ni *peer_ni = cmid->context;
3063 struct kib_conn *conn;
3064 struct kib_msg *msg;
3065 struct rdma_conn_param cp;
3068 unsigned long flags;
3071 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3073 incarnation = peer_ni->ibp_incarnation;
3074 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
3075 peer_ni->ibp_version;
3077 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3079 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3082 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3083 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3087 /* conn "owns" cmid now, so I return success from here on to ensure the
3088 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3091 msg = &conn->ibc_connvars->cv_msg;
3093 memset(msg, 0, sizeof(*msg));
3094 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3095 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3096 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3097 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3099 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3100 0, peer_ni->ibp_nid, incarnation);
3102 memset(&cp, 0, sizeof(cp));
3103 cp.private_data = msg;
3104 cp.private_data_len = msg->ibm_nob;
3105 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3106 cp.initiator_depth = 0;
3107 cp.flow_control = 1;
3108 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3109 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3111 LASSERT(cmid->context == (void *)conn);
3112 LASSERT(conn->ibc_cmid == cmid);
3113 rc = rdma_connect_locked(cmid, &cp);
3115 CERROR("Can't connect to %s: %d\n",
3116 libcfs_nid2str(peer_ni->ibp_nid), rc);
3117 kiblnd_connreq_done(conn, rc);
3118 kiblnd_conn_decref(conn);
3125 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3127 struct kib_peer_ni *peer_ni;
3128 struct kib_conn *conn;
3131 switch (event->event) {
3133 CERROR("Unexpected event: %d, status: %d\n",
3134 event->event, event->status);
3137 case RDMA_CM_EVENT_CONNECT_REQUEST:
3138 /* destroy cmid on failure */
3139 rc = kiblnd_passive_connect(cmid,
3140 (void *)KIBLND_CONN_PARAM(event),
3141 KIBLND_CONN_PARAM_LEN(event));
3142 CDEBUG(D_NET, "connreq: %d\n", rc);
3145 case RDMA_CM_EVENT_ADDR_ERROR:
3146 peer_ni = cmid->context;
3147 CNETERR("%s: ADDR ERROR %d\n",
3148 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3149 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3150 kiblnd_peer_decref(peer_ni);
3151 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3153 case RDMA_CM_EVENT_ADDR_RESOLVED:
3154 peer_ni = cmid->context;
3156 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3157 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3159 if (event->status != 0) {
3160 CNETERR("Can't resolve address for %s: %d\n",
3161 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3164 rc = rdma_resolve_route(
3165 cmid, kiblnd_timeout() * 1000);
3167 struct kib_net *net = peer_ni->ibp_ni->ni_data;
3168 struct kib_dev *dev = net->ibn_dev;
3170 CDEBUG(D_NET, "%s: connection bound to "\
3172 libcfs_nid2str(peer_ni->ibp_nid),
3174 &dev->ibd_ifip, cmid->device->name);
3179 /* Can't initiate route resolution */
3180 CERROR("Can't resolve route for %s: %d\n",
3181 libcfs_nid2str(peer_ni->ibp_nid), rc);
3183 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3184 kiblnd_peer_decref(peer_ni);
3185 return rc; /* rc != 0 destroys cmid */
3187 case RDMA_CM_EVENT_ROUTE_ERROR:
3188 peer_ni = cmid->context;
3189 CNETERR("%s: ROUTE ERROR %d\n",
3190 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3191 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3192 kiblnd_peer_decref(peer_ni);
3193 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3195 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3196 peer_ni = cmid->context;
3197 CDEBUG(D_NET,"%s Route resolved: %d\n",
3198 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3200 if (event->status == 0)
3201 return kiblnd_active_connect(cmid);
3203 CNETERR("Can't resolve route for %s: %d\n",
3204 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3205 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3206 kiblnd_peer_decref(peer_ni);
3207 return event->status; /* rc != 0 destroys cmid */
3209 case RDMA_CM_EVENT_UNREACHABLE:
3210 conn = cmid->context;
3211 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3212 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3213 CNETERR("%s: UNREACHABLE %d\n",
3214 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3215 kiblnd_connreq_done(conn, -ENETDOWN);
3216 kiblnd_conn_decref(conn);
3219 case RDMA_CM_EVENT_CONNECT_ERROR:
3220 conn = cmid->context;
3221 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3222 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3223 CNETERR("%s: CONNECT ERROR %d\n",
3224 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3225 kiblnd_connreq_done(conn, -ENOTCONN);
3226 kiblnd_conn_decref(conn);
3229 case RDMA_CM_EVENT_REJECTED:
3230 conn = cmid->context;
3231 switch (conn->ibc_state) {
3235 case IBLND_CONN_PASSIVE_WAIT:
3236 CERROR ("%s: REJECTED %d\n",
3237 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3239 kiblnd_connreq_done(conn, -ECONNRESET);
3242 case IBLND_CONN_ACTIVE_CONNECT:
3243 kiblnd_rejected(conn, event->status,
3244 (void *)KIBLND_CONN_PARAM(event),
3245 KIBLND_CONN_PARAM_LEN(event));
3248 kiblnd_conn_decref(conn);
3251 case RDMA_CM_EVENT_ESTABLISHED:
3252 conn = cmid->context;
3253 switch (conn->ibc_state) {
3257 case IBLND_CONN_PASSIVE_WAIT:
3258 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3259 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3260 kiblnd_connreq_done(conn, 0);
3263 case IBLND_CONN_ACTIVE_CONNECT:
3264 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3265 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3266 kiblnd_check_connreply(conn,
3267 (void *)KIBLND_CONN_PARAM(event),
3268 KIBLND_CONN_PARAM_LEN(event));
3271 /* net keeps its ref on conn! */
3274 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3275 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3278 case RDMA_CM_EVENT_DISCONNECTED:
3279 conn = cmid->context;
3280 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3281 CERROR("%s DISCONNECTED\n",
3282 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3283 kiblnd_connreq_done(conn, -ECONNRESET);
3285 kiblnd_close_conn(conn, 0);
3287 kiblnd_conn_decref(conn);
3288 cmid->context = NULL;
3291 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3292 LCONSOLE_ERROR_MSG(0x131,
3293 "Received notification of device removal\n"
3294 "Please shutdown LNET to allow this to proceed\n");
3295 /* Can't remove network from underneath LNET for now, so I have
3299 case RDMA_CM_EVENT_ADDR_CHANGE:
3300 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3306 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3310 list_for_each_entry(tx, txs, tx_list) {
3311 if (txs != &conn->ibc_active_txs) {
3312 LASSERT(tx->tx_queued);
3314 LASSERT(!tx->tx_queued);
3315 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3318 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3319 CERROR("Timed out tx: %s(WSQ:%d%d%d), %lld seconds\n",
3320 kiblnd_queue2str(conn, txs),
3321 tx->tx_waiting, tx->tx_sending, tx->tx_queued,
3323 ktime_ms_delta(ktime_get(),
3324 tx->tx_deadline) / MSEC_PER_SEC);
3333 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3335 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3336 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3337 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3338 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3339 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3343 kiblnd_check_conns (int idx)
3346 LIST_HEAD(checksends);
3347 LIST_HEAD(timedout_txs);
3348 struct hlist_head *peers = &kiblnd_data.kib_peers[idx];
3349 struct kib_peer_ni *peer_ni;
3350 struct kib_conn *conn;
3351 struct kib_tx *tx, *tx_tmp;
3352 unsigned long flags;
3354 /* NB. We expect to have a look at all the peers and not find any
3355 * RDMAs to time out, so we just use a shared lock while we
3358 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3360 hlist_for_each_entry(peer_ni, peers, ibp_list) {
3361 /* Check tx_deadline */
3362 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3363 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3364 CWARN("Timed out tx for %s: %lld seconds\n",
3365 libcfs_nid2str(peer_ni->ibp_nid),
3366 ktime_ms_delta(ktime_get(),
3367 tx->tx_deadline) / MSEC_PER_SEC);
3368 list_move(&tx->tx_list, &timedout_txs);
3372 list_for_each_entry(conn, &peer_ni->ibp_conns, ibc_list) {
3376 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3378 spin_lock(&conn->ibc_lock);
3380 sendnoop = kiblnd_need_noop(conn);
3381 timedout = kiblnd_conn_timed_out_locked(conn);
3382 if (!sendnoop && !timedout) {
3383 spin_unlock(&conn->ibc_lock);
3388 CERROR("Timed out RDMA with %s (%lld): c: %u, oc: %u, rc: %u\n",
3389 libcfs_nid2str(peer_ni->ibp_nid),
3391 - peer_ni->ibp_last_alive,
3393 conn->ibc_outstanding_credits,
3394 conn->ibc_reserved_credits);
3395 list_add(&conn->ibc_connd_list, &closes);
3397 list_add(&conn->ibc_connd_list, &checksends);
3399 /* +ref for 'closes' or 'checksends' */
3400 kiblnd_conn_addref(conn);
3402 spin_unlock(&conn->ibc_lock);
3406 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3408 if (!list_empty(&timedout_txs))
3409 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
3410 LNET_MSG_STATUS_NETWORK_TIMEOUT);
3412 /* Handle timeout by closing the whole
3413 * connection. We can only be sure RDMA activity
3414 * has ceased once the QP has been modified.
3416 while ((conn = list_first_entry_or_null(&closes,
3418 ibc_connd_list)) != NULL) {
3419 list_del(&conn->ibc_connd_list);
3420 kiblnd_close_conn(conn, -ETIMEDOUT);
3421 kiblnd_conn_decref(conn);
3424 /* In case we have enough credits to return via a
3425 * NOOP, but there were no non-blocking tx descs
3426 * free to do it last time...
3428 while ((conn = list_first_entry_or_null(&checksends,
3430 ibc_connd_list)) != NULL) {
3431 list_del(&conn->ibc_connd_list);
3433 spin_lock(&conn->ibc_lock);
3434 kiblnd_check_sends_locked(conn);
3435 spin_unlock(&conn->ibc_lock);
3437 kiblnd_conn_decref(conn);
3442 kiblnd_disconnect_conn(struct kib_conn *conn)
3444 LASSERT (!in_interrupt());
3445 LASSERT (current == kiblnd_data.kib_connd);
3446 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3448 rdma_disconnect(conn->ibc_cmid);
3449 kiblnd_finalise_conn(conn);
3451 kiblnd_peer_notify(conn->ibc_peer);
3455 * High-water for reconnection to the same peer_ni, reconnection attempt should
3456 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3458 #define KIB_RECONN_HIGH_RACE 10
3460 * Allow connd to take a break and handle other things after consecutive
3461 * reconnection attemps.
3463 #define KIB_RECONN_BREAK 100
3466 kiblnd_connd (void *arg)
3468 spinlock_t *lock = &kiblnd_data.kib_connd_lock;
3469 wait_queue_entry_t wait;
3470 unsigned long flags;
3471 struct kib_conn *conn;
3476 unsigned long deadline = jiffies;
3479 kiblnd_data.kib_connd = current;
3481 spin_lock_irqsave(lock, flags);
3483 while (!kiblnd_data.kib_shutdown) {
3486 dropped_lock = false;
3488 conn = list_first_entry_or_null(&kiblnd_data.kib_connd_zombies,
3489 struct kib_conn, ibc_list);
3491 struct kib_peer_ni *peer_ni = NULL;
3493 list_del(&conn->ibc_list);
3494 if (conn->ibc_reconnect) {
3495 peer_ni = conn->ibc_peer;
3496 kiblnd_peer_addref(peer_ni);
3499 spin_unlock_irqrestore(lock, flags);
3500 dropped_lock = true;
3502 kiblnd_destroy_conn(conn);
3504 spin_lock_irqsave(lock, flags);
3506 LIBCFS_FREE(conn, sizeof(*conn));
3510 conn->ibc_peer = peer_ni;
3511 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3512 list_add_tail(&conn->ibc_list,
3513 &kiblnd_data.kib_reconn_list);
3515 list_add_tail(&conn->ibc_list,
3516 &kiblnd_data.kib_reconn_wait);
3519 conn = list_first_entry_or_null(&kiblnd_data.kib_connd_conns,
3520 struct kib_conn, ibc_list);
3524 list_del(&conn->ibc_list);
3526 spin_unlock_irqrestore(lock, flags);
3527 dropped_lock = true;
3529 kiblnd_disconnect_conn(conn);
3530 wait = conn->ibc_waits;
3531 if (wait == 0) /* keep ref for connd_wait, see below */
3532 kiblnd_conn_decref(conn);
3534 spin_lock_irqsave(lock, flags);
3537 list_add_tail(&conn->ibc_list,
3538 &kiblnd_data.kib_connd_waits);
3541 while (reconn < KIB_RECONN_BREAK) {
3542 if (kiblnd_data.kib_reconn_sec !=
3543 ktime_get_real_seconds()) {
3544 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3545 list_splice_init(&kiblnd_data.kib_reconn_wait,
3546 &kiblnd_data.kib_reconn_list);
3549 conn = list_first_entry_or_null(&kiblnd_data.kib_reconn_list,
3550 struct kib_conn, ibc_list);
3554 list_del(&conn->ibc_list);
3556 spin_unlock_irqrestore(lock, flags);
3557 dropped_lock = true;
3559 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3560 kiblnd_peer_decref(conn->ibc_peer);
3561 LIBCFS_FREE(conn, sizeof(*conn));
3563 spin_lock_irqsave(lock, flags);
3566 conn = list_first_entry_or_null(&kiblnd_data.kib_connd_waits,
3570 list_del(&conn->ibc_list);
3571 spin_unlock_irqrestore(lock, flags);
3573 dropped_lock = kiblnd_tx_may_discard(conn);
3575 kiblnd_conn_decref(conn);
3577 spin_lock_irqsave(lock, flags);
3579 list_add_tail(&conn->ibc_list,
3580 &kiblnd_data.kib_connd_waits);
3583 /* careful with the jiffy wrap... */
3584 timeout = (int)(deadline - jiffies);
3588 int chunk = HASH_SIZE(kiblnd_data.kib_peers);
3589 unsigned int lnd_timeout;
3591 spin_unlock_irqrestore(lock, flags);
3592 dropped_lock = true;
3594 /* Time to check for RDMA timeouts on a few more
3595 * peers: I do checks every 'p' seconds on a
3596 * proportion of the peer_ni table and I need to check
3597 * every connection 'n' times within a timeout
3598 * interval, to ensure I detect a timeout on any
3599 * connection within (n+1)/n times the timeout
3603 lnd_timeout = kiblnd_timeout();
3604 if (lnd_timeout > n * p)
3605 chunk = (chunk * n * p) / lnd_timeout;
3609 for (i = 0; i < chunk; i++) {
3610 kiblnd_check_conns(peer_index);
3611 peer_index = (peer_index + 1) %
3612 HASH_SIZE(kiblnd_data.kib_peers);
3615 deadline += cfs_time_seconds(p);
3616 spin_lock_irqsave(lock, flags);
3622 /* Nothing to do for 'timeout' */
3623 set_current_state(TASK_INTERRUPTIBLE);
3624 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3625 spin_unlock_irqrestore(lock, flags);
3627 schedule_timeout(timeout);
3629 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3630 spin_lock_irqsave(lock, flags);
3633 spin_unlock_irqrestore(lock, flags);
3635 kiblnd_thread_fini();
3640 kiblnd_qp_event(struct ib_event *event, void *arg)
3642 struct kib_conn *conn = arg;
3644 switch (event->event) {
3645 case IB_EVENT_COMM_EST:
3646 CDEBUG(D_NET, "%s established\n",
3647 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3648 /* We received a packet but connection isn't established
3649 * probably handshake packet was lost, so free to
3650 * force make connection established */
3651 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3654 case IB_EVENT_PORT_ERR:
3655 case IB_EVENT_DEVICE_FATAL:
3656 CERROR("Fatal device error for NI %s\n",
3657 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3658 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
3661 case IB_EVENT_PORT_ACTIVE:
3662 CERROR("Port reactivated for NI %s\n",
3663 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3664 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
3668 CERROR("%s: Async QP event type %d\n",
3669 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3675 kiblnd_complete (struct ib_wc *wc)
3677 switch (kiblnd_wreqid2type(wc->wr_id)) {
3682 if (wc->status != IB_WC_SUCCESS &&
3683 wc->status != IB_WC_WR_FLUSH_ERR)
3684 CNETERR("FastReg failed: %d\n", wc->status);
3687 case IBLND_WID_RDMA:
3688 /* We only get RDMA completion notification if it fails. All
3689 * subsequent work items, including the final SEND will fail
3690 * too. However we can't print out any more info about the
3691 * failing RDMA because 'tx' might be back on the idle list or
3692 * even reused already if we didn't manage to post all our work
3694 CNETERR("RDMA (tx: %p) failed: %d\n",
3695 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3699 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3703 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3710 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3712 /* NB I'm not allowed to schedule this conn once its refcount has
3713 * reached 0. Since fundamentally I'm racing with scheduler threads
3714 * consuming my CQ I could be called after all completions have
3715 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3716 * and this CQ is about to be destroyed so I NOOP. */
3717 struct kib_conn *conn = arg;
3718 struct kib_sched_info *sched = conn->ibc_sched;
3719 unsigned long flags;
3721 LASSERT(cq == conn->ibc_cq);
3723 spin_lock_irqsave(&sched->ibs_lock, flags);
3725 conn->ibc_ready = 1;
3727 if (!conn->ibc_scheduled &&
3728 (conn->ibc_nrx > 0 ||
3729 conn->ibc_nsends_posted > 0)) {
3730 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3731 conn->ibc_scheduled = 1;
3732 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3734 if (waitqueue_active(&sched->ibs_waitq))
3735 wake_up(&sched->ibs_waitq);
3738 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3742 kiblnd_cq_event(struct ib_event *event, void *arg)
3744 struct kib_conn *conn = arg;
3746 CERROR("%s: async CQ event type %d\n",
3747 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3751 kiblnd_scheduler(void *arg)
3753 long id = (long)arg;
3754 struct kib_sched_info *sched;
3755 struct kib_conn *conn;
3756 wait_queue_entry_t wait;
3757 unsigned long flags;
3764 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3766 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3768 CWARN("Unable to bind on CPU partition %d, please verify whether all CPUs are healthy and reload modules if necessary, otherwise your system might under risk of low performance\n", sched->ibs_cpt);
3771 spin_lock_irqsave(&sched->ibs_lock, flags);
3773 while (!kiblnd_data.kib_shutdown) {
3774 if (need_resched()) {
3775 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3779 spin_lock_irqsave(&sched->ibs_lock, flags);
3782 did_something = false;
3784 conn = list_first_entry_or_null(&sched->ibs_conns,
3788 /* take over kib_sched_conns' ref on conn... */
3789 LASSERT(conn->ibc_scheduled);
3790 list_del(&conn->ibc_sched_list);
3791 conn->ibc_ready = 0;
3793 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3795 wc.wr_id = IBLND_WID_INVAL;
3797 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3799 rc = ib_req_notify_cq(conn->ibc_cq,
3802 CWARN("%s: ib_req_notify_cq failed: %d, closing connection\n",
3803 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3804 kiblnd_close_conn(conn, -EIO);
3805 kiblnd_conn_decref(conn);
3806 spin_lock_irqsave(&sched->ibs_lock,
3811 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3814 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3816 "ib_poll_cq (rc: %d) returned invalid "
3817 "wr_id, opcode %d, status: %d, "
3818 "vendor_err: %d, conn: %s status: %d\n"
3819 "please upgrade firmware and OFED or "
3820 "contact vendor.\n", rc,
3821 wc.opcode, wc.status, wc.vendor_err,
3822 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3828 CWARN("%s: ib_poll_cq failed: %d, closing connection\n",
3829 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3831 kiblnd_close_conn(conn, -EIO);
3832 kiblnd_conn_decref(conn);
3833 spin_lock_irqsave(&sched->ibs_lock, flags);
3837 spin_lock_irqsave(&sched->ibs_lock, flags);
3839 if (rc != 0 || conn->ibc_ready) {
3840 /* There may be another completion waiting; get
3841 * another scheduler to check while I handle
3843 /* +1 ref for sched_conns */
3844 kiblnd_conn_addref(conn);
3845 list_add_tail(&conn->ibc_sched_list,
3847 if (waitqueue_active(&sched->ibs_waitq))
3848 wake_up(&sched->ibs_waitq);
3850 conn->ibc_scheduled = 0;
3854 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3855 kiblnd_complete(&wc);
3857 spin_lock_irqsave(&sched->ibs_lock, flags);
3860 kiblnd_conn_decref(conn); /* ..drop my ref from above */
3861 did_something = true;
3867 set_current_state(TASK_INTERRUPTIBLE);
3868 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3869 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3873 remove_wait_queue(&sched->ibs_waitq, &wait);
3874 set_current_state(TASK_RUNNING);
3875 spin_lock_irqsave(&sched->ibs_lock, flags);
3878 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3880 kiblnd_thread_fini();
3885 kiblnd_failover_thread(void *arg)
3887 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3888 struct kib_dev *dev;
3889 struct net *ns = arg;
3890 wait_queue_entry_t wait;
3891 unsigned long flags;
3894 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3897 write_lock_irqsave(glock, flags);
3899 while (!kiblnd_data.kib_shutdown) {
3900 bool do_failover = false;
3903 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3905 if (ktime_get_seconds() < dev->ibd_next_failover)
3912 list_del_init(&dev->ibd_fail_list);
3913 dev->ibd_failover = 1;
3914 write_unlock_irqrestore(glock, flags);
3916 rc = kiblnd_dev_failover(dev, ns);
3918 write_lock_irqsave(glock, flags);
3920 LASSERT(dev->ibd_failover);
3921 dev->ibd_failover = 0;
3922 if (rc >= 0) { /* Device is OK or failover succeed */
3923 dev->ibd_next_failover = ktime_get_seconds() + 3;
3927 /* failed to failover, retry later */
3928 dev->ibd_next_failover = ktime_get_seconds() +
3929 min(dev->ibd_failed_failover, 10);
3930 if (kiblnd_dev_can_failover(dev)) {
3931 list_add_tail(&dev->ibd_fail_list,
3932 &kiblnd_data.kib_failed_devs);
3938 /* long sleep if no more pending failover */
3939 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3941 set_current_state(TASK_INTERRUPTIBLE);
3942 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3943 write_unlock_irqrestore(glock, flags);
3945 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3946 cfs_time_seconds(1));
3947 set_current_state(TASK_RUNNING);
3948 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3949 write_lock_irqsave(glock, flags);
3951 if (!long_sleep || rc != 0)
3954 /* have a long sleep, routine check all active devices,
3955 * we need checking like this because if there is not active
3956 * connection on the dev and no SEND from local, we may listen
3957 * on wrong HCA for ever while there is a bonding failover
3959 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3960 if (kiblnd_dev_can_failover(dev)) {
3961 list_add_tail(&dev->ibd_fail_list,
3962 &kiblnd_data.kib_failed_devs);
3967 write_unlock_irqrestore(glock, flags);
3969 kiblnd_thread_fini();