4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/klnds/o2iblnd/o2iblnd_cb.c
34 * Author: Eric Barton <eric@bartonsoftware.com>
39 #define MAX_CONN_RACES_BEFORE_ABORT 20
41 static void kiblnd_peer_alive(struct kib_peer_ni *peer_ni);
42 static void kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
44 static void kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx,
45 int type, int body_nob);
46 static int kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
47 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie);
48 static void kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn);
49 static void kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn);
51 static void kiblnd_unmap_tx(struct kib_tx *tx);
52 static void kiblnd_check_sends_locked(struct kib_conn *conn);
55 kiblnd_tx_done(struct kib_tx *tx)
57 struct lnet_msg *lntmsg[2];
61 LASSERT (!in_interrupt());
62 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
63 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
64 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer_ni response */
65 LASSERT (tx->tx_pool != NULL);
69 /* tx may have up to 2 lnet msgs to finalise */
70 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
71 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
74 if (tx->tx_conn != NULL) {
75 kiblnd_conn_decref(tx->tx_conn);
79 tx->tx_nwrq = tx->tx_nsge = 0;
82 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
84 /* delay finalize until my descs have been freed */
85 for (i = 0; i < 2; i++) {
86 if (lntmsg[i] == NULL)
89 /* propagate health status to LNet for requests */
90 if (i == 0 && lntmsg[i])
91 lntmsg[i]->msg_health_status = tx->tx_hstatus;
93 lnet_finalize(lntmsg[i], rc);
98 kiblnd_txlist_done(struct list_head *txlist, int status,
99 enum lnet_msg_hstatus hstatus)
103 while (!list_empty(txlist)) {
104 tx = list_entry(txlist->next, struct kib_tx, tx_list);
106 list_del(&tx->tx_list);
109 tx->tx_status = status;
110 if (hstatus != LNET_MSG_STATUS_OK)
111 tx->tx_hstatus = hstatus;
116 static struct kib_tx *
117 kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
119 struct kib_net *net = ni->ni_data;
120 struct list_head *node;
122 struct kib_tx_poolset *tps;
124 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
125 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
128 tx = container_of(node, struct kib_tx, tx_list);
130 LASSERT (tx->tx_nwrq == 0);
131 LASSERT (!tx->tx_queued);
132 LASSERT (tx->tx_sending == 0);
133 LASSERT (!tx->tx_waiting);
134 LASSERT (tx->tx_status == 0);
135 LASSERT (tx->tx_conn == NULL);
136 LASSERT (tx->tx_lntmsg[0] == NULL);
137 LASSERT (tx->tx_lntmsg[1] == NULL);
138 LASSERT (tx->tx_nfrags == 0);
141 tx->tx_hstatus = LNET_MSG_STATUS_OK;
147 kiblnd_drop_rx(struct kib_rx *rx)
149 struct kib_conn *conn = rx->rx_conn;
150 struct kib_sched_info *sched = conn->ibc_sched;
153 spin_lock_irqsave(&sched->ibs_lock, flags);
154 LASSERT(conn->ibc_nrx > 0);
156 spin_unlock_irqrestore(&sched->ibs_lock, flags);
158 kiblnd_conn_decref(conn);
162 kiblnd_post_rx(struct kib_rx *rx, int credit)
164 struct kib_conn *conn = rx->rx_conn;
165 struct kib_net *net = conn->ibc_peer->ibp_ni->ni_data;
166 struct ib_recv_wr *bad_wrq = NULL;
167 #ifdef HAVE_IB_GET_DMA_MR
168 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
172 LASSERT (net != NULL);
173 LASSERT (!in_interrupt());
174 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
175 credit == IBLND_POSTRX_PEER_CREDIT ||
176 credit == IBLND_POSTRX_RSRVD_CREDIT);
177 #ifdef HAVE_IB_GET_DMA_MR
180 rx->rx_sge.lkey = mr->lkey;
182 rx->rx_sge.lkey = conn->ibc_hdev->ibh_pd->local_dma_lkey;
184 rx->rx_sge.addr = rx->rx_msgaddr;
185 rx->rx_sge.length = IBLND_MSG_SIZE;
187 rx->rx_wrq.next = NULL;
188 rx->rx_wrq.sg_list = &rx->rx_sge;
189 rx->rx_wrq.num_sge = 1;
190 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
192 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
193 LASSERT (rx->rx_nob >= 0); /* not posted */
195 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
196 kiblnd_drop_rx(rx); /* No more posts for this rx */
200 rx->rx_nob = -1; /* flag posted */
202 /* NB: need an extra reference after ib_post_recv because we don't
203 * own this rx (and rx::rx_conn) anymore, LU-5678.
205 kiblnd_conn_addref(conn);
206 #ifdef HAVE_IB_POST_SEND_RECV_CONST
207 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq,
208 (const struct ib_recv_wr **)&bad_wrq);
210 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
212 if (unlikely(rc != 0)) {
213 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
214 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
218 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
221 if (unlikely(rc != 0)) {
222 kiblnd_close_conn(conn, rc);
223 kiblnd_drop_rx(rx); /* No more posts for this rx */
227 if (credit == IBLND_POSTRX_NO_CREDIT)
230 spin_lock(&conn->ibc_lock);
231 if (credit == IBLND_POSTRX_PEER_CREDIT)
232 conn->ibc_outstanding_credits++;
234 conn->ibc_reserved_credits++;
235 kiblnd_check_sends_locked(conn);
236 spin_unlock(&conn->ibc_lock);
239 kiblnd_conn_decref(conn);
243 static struct kib_tx *
244 kiblnd_find_waiting_tx_locked(struct kib_conn *conn, int txtype, u64 cookie)
246 struct list_head *tmp;
248 list_for_each(tmp, &conn->ibc_active_txs) {
249 struct kib_tx *tx = list_entry(tmp, struct kib_tx, tx_list);
251 LASSERT(!tx->tx_queued);
252 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
254 if (tx->tx_cookie != cookie)
257 if (tx->tx_waiting &&
258 tx->tx_msg->ibm_type == txtype)
261 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
262 tx->tx_waiting ? "" : "NOT ",
263 tx->tx_msg->ibm_type, txtype);
269 kiblnd_handle_completion(struct kib_conn *conn, int txtype, int status, u64 cookie)
272 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
275 spin_lock(&conn->ibc_lock);
277 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
279 spin_unlock(&conn->ibc_lock);
281 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
282 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
283 kiblnd_close_conn(conn, -EPROTO);
287 if (tx->tx_status == 0) { /* success so far */
288 if (status < 0) { /* failed? */
289 tx->tx_status = status;
290 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
291 } else if (txtype == IBLND_MSG_GET_REQ) {
292 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
298 idle = !tx->tx_queued && (tx->tx_sending == 0);
300 list_del(&tx->tx_list);
302 spin_unlock(&conn->ibc_lock);
309 kiblnd_send_completion(struct kib_conn *conn, int type, int status, u64 cookie)
311 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
312 struct kib_tx *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
315 CERROR("Can't get tx for completion %x for %s\n",
316 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
320 tx->tx_msg->ibm_u.completion.ibcm_status = status;
321 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
322 kiblnd_init_tx_msg(ni, tx, type, sizeof(struct kib_completion_msg));
324 kiblnd_queue_tx(tx, conn);
328 kiblnd_handle_rx(struct kib_rx *rx)
330 struct kib_msg *msg = rx->rx_msg;
331 struct kib_conn *conn = rx->rx_conn;
332 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
333 int credits = msg->ibm_credits;
339 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
341 CDEBUG (D_NET, "Received %x[%d] from %s\n",
342 msg->ibm_type, credits,
343 libcfs_nid2str(conn->ibc_peer->ibp_nid));
346 /* Have I received credits that will let me send? */
347 spin_lock(&conn->ibc_lock);
349 if (conn->ibc_credits + credits >
350 conn->ibc_queue_depth) {
351 rc2 = conn->ibc_credits;
352 spin_unlock(&conn->ibc_lock);
354 CERROR("Bad credits from %s: %d + %d > %d\n",
355 libcfs_nid2str(conn->ibc_peer->ibp_nid),
357 conn->ibc_queue_depth);
359 kiblnd_close_conn(conn, -EPROTO);
360 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
364 conn->ibc_credits += credits;
366 /* This ensures the credit taken by NOOP can be returned */
367 if (msg->ibm_type == IBLND_MSG_NOOP &&
368 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
369 conn->ibc_outstanding_credits++;
371 kiblnd_check_sends_locked(conn);
372 spin_unlock(&conn->ibc_lock);
375 switch (msg->ibm_type) {
377 CERROR("Bad IBLND message type %x from %s\n",
378 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
379 post_credit = IBLND_POSTRX_NO_CREDIT;
384 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
385 post_credit = IBLND_POSTRX_NO_CREDIT;
389 if (credits != 0) /* credit already posted */
390 post_credit = IBLND_POSTRX_NO_CREDIT;
391 else /* a keepalive NOOP */
392 post_credit = IBLND_POSTRX_PEER_CREDIT;
395 case IBLND_MSG_IMMEDIATE:
396 post_credit = IBLND_POSTRX_DONT_POST;
397 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
398 msg->ibm_srcnid, rx, 0);
399 if (rc < 0) /* repost on error */
400 post_credit = IBLND_POSTRX_PEER_CREDIT;
403 case IBLND_MSG_PUT_REQ:
404 post_credit = IBLND_POSTRX_DONT_POST;
405 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
406 msg->ibm_srcnid, rx, 1);
407 if (rc < 0) /* repost on error */
408 post_credit = IBLND_POSTRX_PEER_CREDIT;
411 case IBLND_MSG_PUT_NAK:
412 CWARN ("PUT_NACK from %s\n",
413 libcfs_nid2str(conn->ibc_peer->ibp_nid));
414 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
415 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
416 msg->ibm_u.completion.ibcm_status,
417 msg->ibm_u.completion.ibcm_cookie);
420 case IBLND_MSG_PUT_ACK:
421 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
423 spin_lock(&conn->ibc_lock);
424 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
425 msg->ibm_u.putack.ibpam_src_cookie);
427 list_del(&tx->tx_list);
428 spin_unlock(&conn->ibc_lock);
431 CERROR("Unmatched PUT_ACK from %s\n",
432 libcfs_nid2str(conn->ibc_peer->ibp_nid));
437 LASSERT (tx->tx_waiting);
438 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
439 * (a) I can overwrite tx_msg since my peer_ni has received it!
440 * (b) tx_waiting set tells tx_complete() it's not done. */
442 tx->tx_nwrq = tx->tx_nsge = 0; /* overwrite PUT_REQ */
444 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
445 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
446 &msg->ibm_u.putack.ibpam_rd,
447 msg->ibm_u.putack.ibpam_dst_cookie);
449 CERROR("Can't setup rdma for PUT to %s: %d\n",
450 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
452 spin_lock(&conn->ibc_lock);
453 tx->tx_waiting = 0; /* clear waiting and queue atomically */
454 kiblnd_queue_tx_locked(tx, conn);
455 spin_unlock(&conn->ibc_lock);
458 case IBLND_MSG_PUT_DONE:
459 post_credit = IBLND_POSTRX_PEER_CREDIT;
460 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
461 msg->ibm_u.completion.ibcm_status,
462 msg->ibm_u.completion.ibcm_cookie);
465 case IBLND_MSG_GET_REQ:
466 post_credit = IBLND_POSTRX_DONT_POST;
467 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
468 msg->ibm_srcnid, rx, 1);
469 if (rc < 0) /* repost on error */
470 post_credit = IBLND_POSTRX_PEER_CREDIT;
473 case IBLND_MSG_GET_DONE:
474 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
475 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
476 msg->ibm_u.completion.ibcm_status,
477 msg->ibm_u.completion.ibcm_cookie);
481 if (rc < 0) /* protocol error */
482 kiblnd_close_conn(conn, rc);
484 if (post_credit != IBLND_POSTRX_DONT_POST)
485 kiblnd_post_rx(rx, post_credit);
489 kiblnd_rx_complete(struct kib_rx *rx, int status, int nob)
491 struct kib_msg *msg = rx->rx_msg;
492 struct kib_conn *conn = rx->rx_conn;
493 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
494 struct kib_net *net = ni->ni_data;
498 LASSERT (net != NULL);
499 LASSERT (rx->rx_nob < 0); /* was posted */
500 rx->rx_nob = 0; /* isn't now */
502 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
505 if (status != IB_WC_SUCCESS) {
506 CNETERR("Rx from %s failed: %d\n",
507 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
514 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
516 CERROR ("Error %d unpacking rx from %s\n",
517 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
521 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
522 msg->ibm_dstnid != ni->ni_nid ||
523 msg->ibm_srcstamp != conn->ibc_incarnation ||
524 msg->ibm_dststamp != net->ibn_incarnation) {
525 CERROR ("Stale rx from %s\n",
526 libcfs_nid2str(conn->ibc_peer->ibp_nid));
531 /* set time last known alive */
532 kiblnd_peer_alive(conn->ibc_peer);
534 /* racing with connection establishment/teardown! */
536 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
537 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
540 write_lock_irqsave(g_lock, flags);
541 /* must check holding global lock to eliminate race */
542 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
543 list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
544 write_unlock_irqrestore(g_lock, flags);
547 write_unlock_irqrestore(g_lock, flags);
549 kiblnd_handle_rx(rx);
553 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
554 kiblnd_close_conn(conn, err);
556 kiblnd_drop_rx(rx); /* Don't re-post rx. */
560 kiblnd_fmr_map_tx(struct kib_net *net, struct kib_tx *tx,
561 struct kib_rdma_desc *rd, u32 nob)
563 struct kib_hca_dev *hdev;
565 struct kib_fmr_poolset *fps;
570 LASSERT(tx->tx_pool != NULL);
571 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
574 hdev = tx->tx_pool->tpo_hdev;
575 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
578 * If we're dealing with FastReg, but the device doesn't
579 * support GAPS and the tx has GAPS, then there is no real point
580 * in trying to map the memory, because it'll just fail. So
581 * preemptively fail with an appropriate message
583 if ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED) &&
584 !(dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT) &&
586 CERROR("Using FastReg with no GAPS support, but tx has gaps. "
587 "Try setting use_fastreg_gaps to 1\n");
588 return -EPROTONOSUPPORT;
592 * FMR does not support gaps but the tx has gaps then
593 * we should make sure that the number of fragments we'll be sending
594 * over fits within the number of fragments negotiated on the
595 * connection, otherwise, we won't be able to RDMA the data.
596 * We need to maintain the number of fragments negotiation on the
597 * connection for backwards compatibility.
599 if (tx->tx_gaps && (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)) {
601 tx->tx_conn->ibc_max_frags <= rd->rd_nfrags) {
602 CERROR("TX number of frags (%d) is <= than connection"
603 " number of frags (%d). Consider setting peer's"
604 " map_on_demand to 256\n", tx->tx_nfrags,
605 tx->tx_conn->ibc_max_frags);
610 fps = net->ibn_fmr_ps[cpt];
611 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
613 CERROR("Can't map %u bytes (%u/%u)s: %d\n", nob,
614 tx->tx_nfrags, rd->rd_nfrags, rc);
619 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
622 rd->rd_key = tx->tx_fmr.fmr_key;
624 * for FastReg or FMR with no gaps we can accumulate all
625 * the fragments in one FastReg or FMR fragment.
627 if (((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED) && !tx->tx_gaps) ||
628 (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
629 /* FMR requires zero based address */
630 if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
631 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
632 rd->rd_frags[0].rf_nob = nob;
636 * We're transmitting with gaps using FMR.
637 * We'll need to use multiple fragments and identify the
638 * zero based address of each fragment.
640 for (i = 0; i < rd->rd_nfrags; i++) {
641 rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
642 rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
650 kiblnd_unmap_tx(struct kib_tx *tx)
652 if (tx->tx_fmr.fmr_pfmr || tx->tx_fmr.fmr_frd)
653 kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);
655 if (tx->tx_nfrags != 0) {
656 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
657 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
662 #ifdef HAVE_IB_GET_DMA_MR
663 static struct ib_mr *
664 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, struct kib_rdma_desc *rd)
666 struct kib_net *net = ni->ni_data;
667 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
668 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
670 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
673 * if map-on-demand is turned on and the device supports
674 * either FMR or FastReg then use that. Otherwise use global
675 * memory regions. If that's not available either, then you're
676 * dead in the water and fail the operation.
678 if (tunables->lnd_map_on_demand &&
679 (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED ||
680 net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED))
684 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
685 * in the call chain. The mapping will fail with appropriate error
688 return hdev->ibh_mrs;
692 static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx,
693 struct kib_rdma_desc *rd, int nfrags)
695 struct kib_net *net = ni->ni_data;
696 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
697 #ifdef HAVE_IB_GET_DMA_MR
698 struct ib_mr *mr = NULL;
703 /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
705 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
706 tx->tx_nfrags = nfrags;
708 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
709 tx->tx_nfrags, tx->tx_dmadir);
711 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
712 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
713 hdev->ibh_ibdev, &tx->tx_frags[i]);
714 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
715 hdev->ibh_ibdev, &tx->tx_frags[i]);
716 nob += rd->rd_frags[i].rf_nob;
719 #ifdef HAVE_IB_GET_DMA_MR
720 mr = kiblnd_find_rd_dma_mr(ni, rd);
722 /* found pre-mapping MR */
723 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
728 if (net->ibn_fmr_ps != NULL)
729 return kiblnd_fmr_map_tx(net, tx, rd, nob);
734 static int kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
735 struct kib_rdma_desc *rd, int nkiov,
736 struct bio_vec *kiov, int offset, int nob)
738 struct kib_net *net = ni->ni_data;
739 struct scatterlist *sg;
743 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
747 LASSERT(net != NULL);
749 while (offset >= kiov->bv_len) {
750 offset -= kiov->bv_len;
762 fragnob = min((int)(kiov->bv_len - offset), nob);
765 * We're allowed to start at a non-aligned page offset in
766 * the first fragment and end at a non-aligned page offset
767 * in the last fragment.
769 if ((fragnob < (int)(kiov->bv_len - offset)) &&
770 nkiov < max_nkiov && nob > fragnob) {
771 CDEBUG(D_NET, "fragnob %d < available page %d: with"
772 " remaining %d kiovs with %d nob left\n",
773 fragnob, (int)(kiov->bv_len - offset),
778 sg_set_page(sg, kiov->bv_page, fragnob,
779 kiov->bv_offset + offset);
782 CERROR("lacking enough sg entries to map tx\n");
792 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
796 kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
797 __must_hold(&conn->ibc_lock)
799 struct kib_msg *msg = tx->tx_msg;
800 struct kib_peer_ni *peer_ni = conn->ibc_peer;
801 struct lnet_ni *ni = peer_ni->ibp_ni;
802 int ver = conn->ibc_version;
806 LASSERT(tx->tx_queued);
807 /* We rely on this for QP sizing */
808 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
809 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
811 LASSERT(credit == 0 || credit == 1);
812 LASSERT(conn->ibc_outstanding_credits >= 0);
813 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
814 LASSERT(conn->ibc_credits >= 0);
815 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
817 if (conn->ibc_nsends_posted ==
818 kiblnd_concurrent_sends(ver, ni)) {
819 /* tx completions outstanding... */
820 CDEBUG(D_NET, "%s: posted enough\n",
821 libcfs_nid2str(peer_ni->ibp_nid));
825 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
826 CDEBUG(D_NET, "%s: no credits\n",
827 libcfs_nid2str(peer_ni->ibp_nid));
831 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
832 conn->ibc_credits == 1 && /* last credit reserved */
833 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
834 CDEBUG(D_NET, "%s: not using last credit\n",
835 libcfs_nid2str(peer_ni->ibp_nid));
839 /* NB don't drop ibc_lock before bumping tx_sending */
840 list_del(&tx->tx_list);
843 if (msg->ibm_type == IBLND_MSG_NOOP &&
844 (!kiblnd_need_noop(conn) || /* redundant NOOP */
845 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
846 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
847 /* OK to drop when posted enough NOOPs, since
848 * kiblnd_check_sends_locked will queue NOOP again when
849 * posted NOOPs complete */
850 spin_unlock(&conn->ibc_lock);
851 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
853 spin_lock(&conn->ibc_lock);
854 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
855 libcfs_nid2str(peer_ni->ibp_nid),
856 conn->ibc_noops_posted);
860 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
861 peer_ni->ibp_nid, conn->ibc_incarnation);
863 conn->ibc_credits -= credit;
864 conn->ibc_outstanding_credits = 0;
865 conn->ibc_nsends_posted++;
866 if (msg->ibm_type == IBLND_MSG_NOOP)
867 conn->ibc_noops_posted++;
869 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
870 * PUT. If so, it was first queued here as a PUT_REQ, sent and
871 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
872 * and then re-queued here. It's (just) possible that
873 * tx_sending is non-zero if we've not done the tx_complete()
874 * from the first send; hence the ++ rather than = below. */
876 list_add(&tx->tx_list, &conn->ibc_active_txs);
877 tx->tx_on_activeq = ktime_get();
879 /* I'm still holding ibc_lock! */
880 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
882 } else if (tx->tx_pool->tpo_pool.po_failed ||
883 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
884 /* close_conn will launch failover */
887 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
888 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
889 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
892 if (!frd->frd_valid) {
893 wr = &frd->frd_inv_wr.wr;
894 wr->next = &frd->frd_fastreg_wr.wr;
896 wr = &frd->frd_fastreg_wr.wr;
898 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
901 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
902 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
903 bad->wr_id, bad->opcode, bad->send_flags,
904 libcfs_nid2str(conn->ibc_peer->ibp_nid));
907 if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
910 #ifdef HAVE_IB_POST_SEND_RECV_CONST
911 rc = ib_post_send(conn->ibc_cmid->qp, wr,
912 (const struct ib_send_wr **)&bad);
914 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
918 conn->ibc_last_send = ktime_get();
923 /* NB credits are transferred in the actual
924 * message, which can only be the last work item */
925 conn->ibc_credits += credit;
926 conn->ibc_outstanding_credits += msg->ibm_credits;
927 conn->ibc_nsends_posted--;
928 if (msg->ibm_type == IBLND_MSG_NOOP)
929 conn->ibc_noops_posted--;
935 done = (tx->tx_sending == 0);
937 list_del(&tx->tx_list);
939 spin_unlock(&conn->ibc_lock);
941 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
942 CERROR("Error %d posting transmit to %s\n",
943 rc, libcfs_nid2str(peer_ni->ibp_nid));
945 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
946 rc, libcfs_nid2str(peer_ni->ibp_nid));
948 kiblnd_close_conn(conn, rc);
953 spin_lock(&conn->ibc_lock);
959 kiblnd_check_sends_locked(struct kib_conn *conn)
961 int ver = conn->ibc_version;
962 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
965 /* Don't send anything until after the connection is established */
966 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
967 CDEBUG(D_NET, "%s too soon\n",
968 libcfs_nid2str(conn->ibc_peer->ibp_nid));
972 LASSERT(conn->ibc_nsends_posted <=
973 kiblnd_concurrent_sends(ver, ni));
974 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
975 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
976 LASSERT (conn->ibc_reserved_credits >= 0);
978 while (conn->ibc_reserved_credits > 0 &&
979 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
980 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
981 struct kib_tx, tx_list);
982 list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
983 conn->ibc_reserved_credits--;
986 if (kiblnd_need_noop(conn)) {
987 spin_unlock(&conn->ibc_lock);
989 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
991 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
993 spin_lock(&conn->ibc_lock);
995 kiblnd_queue_tx_locked(tx, conn);
1001 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1003 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1004 struct kib_tx, tx_list);
1005 } else if (!list_empty(&conn->ibc_tx_noops)) {
1006 LASSERT (!IBLND_OOB_CAPABLE(ver));
1008 tx = list_entry(conn->ibc_tx_noops.next,
1009 struct kib_tx, tx_list);
1010 } else if (!list_empty(&conn->ibc_tx_queue)) {
1012 tx = list_entry(conn->ibc_tx_queue.next,
1013 struct kib_tx, tx_list);
1017 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1023 kiblnd_tx_complete(struct kib_tx *tx, int status)
1025 int failed = (status != IB_WC_SUCCESS);
1026 struct kib_conn *conn = tx->tx_conn;
1029 if (tx->tx_sending <= 0) {
1030 CERROR("Received an event on a freed tx: %p status %d\n",
1036 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1037 CNETERR("Tx -> %s cookie %#llx"
1038 " sending %d waiting %d: failed %d\n",
1039 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1040 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1043 kiblnd_close_conn(conn, -EIO);
1045 kiblnd_peer_alive(conn->ibc_peer);
1048 spin_lock(&conn->ibc_lock);
1050 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1051 * gets to free it, which also drops its ref on 'conn'. */
1054 conn->ibc_nsends_posted--;
1055 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1056 conn->ibc_noops_posted--;
1059 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
1060 tx->tx_waiting = 0; /* don't wait for peer_ni */
1061 tx->tx_status = -EIO;
1064 idle = (tx->tx_sending == 0) && /* This is the final callback */
1065 !tx->tx_waiting && /* Not waiting for peer_ni */
1066 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1068 list_del(&tx->tx_list);
1070 kiblnd_check_sends_locked(conn);
1071 spin_unlock(&conn->ibc_lock);
1078 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1081 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1082 struct ib_sge *sge = &tx->tx_msgsge;
1083 struct ib_rdma_wr *wrq;
1084 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1085 #ifdef HAVE_IB_GET_DMA_MR
1086 struct ib_mr *mr = hdev->ibh_mrs;
1089 LASSERT(tx->tx_nwrq >= 0);
1090 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1091 LASSERT(nob <= IBLND_MSG_SIZE);
1092 #ifdef HAVE_IB_GET_DMA_MR
1093 LASSERT(mr != NULL);
1096 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1098 #ifdef HAVE_IB_GET_DMA_MR
1099 sge->lkey = mr->lkey;
1101 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1103 sge->addr = tx->tx_msgaddr;
1106 wrq = &tx->tx_wrq[tx->tx_nwrq];
1107 memset(wrq, 0, sizeof(*wrq));
1109 wrq->wr.next = NULL;
1110 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1111 wrq->wr.sg_list = sge;
1112 wrq->wr.num_sge = 1;
1113 wrq->wr.opcode = IB_WR_SEND;
1114 wrq->wr.send_flags = IB_SEND_SIGNALED;
1120 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1121 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
1123 struct kib_msg *ibmsg = tx->tx_msg;
1124 struct kib_rdma_desc *srcrd = tx->tx_rd;
1125 struct ib_rdma_wr *wrq = NULL;
1133 LASSERT(!in_interrupt());
1134 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1135 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1137 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1138 resid > 0; resid -= sge_nob) {
1141 if (srcidx >= srcrd->rd_nfrags) {
1142 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1147 if (dstidx >= dstrd->rd_nfrags) {
1148 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1153 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1154 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1155 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1156 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1157 conn->ibc_max_frags,
1158 srcidx, srcrd->rd_nfrags,
1159 dstidx, dstrd->rd_nfrags);
1164 sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1165 kiblnd_rd_frag_size(dstrd, dstidx),
1168 sge = &tx->tx_sge[tx->tx_nsge];
1169 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1170 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1171 sge->length = sge_nob;
1174 wrq = &tx->tx_wrq[tx->tx_nwrq];
1176 wrq->wr.next = &(wrq + 1)->wr;
1177 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1178 wrq->wr.sg_list = sge;
1179 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1180 wrq->wr.send_flags = 0;
1182 #ifdef HAVE_IB_RDMA_WR
1183 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1185 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1188 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1190 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1195 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1196 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1199 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1201 wrq->wr.num_sge = wrq_sge;
1207 if (rc < 0) /* no RDMA if completing with failure */
1208 tx->tx_nwrq = tx->tx_nsge = 0;
1210 ibmsg->ibm_u.completion.ibcm_status = rc;
1211 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1212 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1213 type, sizeof(struct kib_completion_msg));
1219 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1221 struct list_head *q;
1224 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1225 LASSERT(!tx->tx_queued); /* not queued for sending already */
1226 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1228 if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
1229 tx->tx_status = -ECONNABORTED;
1231 if (tx->tx_conn != NULL) {
1232 /* PUT_DONE first attached to conn as a PUT_REQ */
1233 LASSERT(tx->tx_conn == conn);
1234 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1236 kiblnd_conn_decref(conn);
1238 list_add(&tx->tx_list, &conn->ibc_zombie_txs);
1243 timeout_ns = kiblnd_timeout() * NSEC_PER_SEC;
1245 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1247 if (tx->tx_conn == NULL) {
1248 kiblnd_conn_addref(conn);
1250 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1252 /* PUT_DONE first attached to conn as a PUT_REQ */
1253 LASSERT (tx->tx_conn == conn);
1254 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1257 switch (tx->tx_msg->ibm_type) {
1261 case IBLND_MSG_PUT_REQ:
1262 case IBLND_MSG_GET_REQ:
1263 q = &conn->ibc_tx_queue_rsrvd;
1266 case IBLND_MSG_PUT_NAK:
1267 case IBLND_MSG_PUT_ACK:
1268 case IBLND_MSG_PUT_DONE:
1269 case IBLND_MSG_GET_DONE:
1270 q = &conn->ibc_tx_queue_nocred;
1273 case IBLND_MSG_NOOP:
1274 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1275 q = &conn->ibc_tx_queue_nocred;
1277 q = &conn->ibc_tx_noops;
1280 case IBLND_MSG_IMMEDIATE:
1281 q = &conn->ibc_tx_queue;
1285 list_add_tail(&tx->tx_list, q);
1289 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1291 spin_lock(&conn->ibc_lock);
1292 kiblnd_queue_tx_locked(tx, conn);
1293 kiblnd_check_sends_locked(conn);
1294 spin_unlock(&conn->ibc_lock);
1297 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1298 struct sockaddr_in *srcaddr,
1299 struct sockaddr_in *dstaddr,
1302 unsigned short port;
1305 /* allow the port to be reused */
1306 rc = rdma_set_reuseaddr(cmid, 1);
1308 CERROR("Unable to set reuse on cmid: %d\n", rc);
1312 /* look for a free privileged port */
1313 for (port = PROT_SOCK-1; port > 0; port--) {
1314 srcaddr->sin_port = htons(port);
1315 rc = rdma_resolve_addr(cmid,
1316 (struct sockaddr *)srcaddr,
1317 (struct sockaddr *)dstaddr,
1320 CDEBUG(D_NET, "bound to port %hu\n", port);
1322 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1323 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1330 CERROR("Failed to bind to a free privileged port\n");
1335 kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
1337 struct rdma_cm_id *cmid;
1338 struct kib_dev *dev;
1339 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1340 struct sockaddr_in srcaddr;
1341 struct sockaddr_in dstaddr;
1344 LASSERT (net != NULL);
1345 LASSERT (peer_ni->ibp_connecting > 0);
1347 cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
1348 kiblnd_cm_callback, peer_ni,
1349 RDMA_PS_TCP, IB_QPT_RC);
1352 CERROR("Can't create CMID for %s: %ld\n",
1353 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1359 memset(&srcaddr, 0, sizeof(srcaddr));
1360 srcaddr.sin_family = AF_INET;
1361 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1363 memset(&dstaddr, 0, sizeof(dstaddr));
1364 dstaddr.sin_family = AF_INET;
1365 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1366 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1368 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1370 if (*kiblnd_tunables.kib_use_priv_port) {
1371 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1372 kiblnd_timeout() * 1000);
1374 rc = rdma_resolve_addr(cmid,
1375 (struct sockaddr *)&srcaddr,
1376 (struct sockaddr *)&dstaddr,
1377 kiblnd_timeout() * 1000);
1380 /* Can't initiate address resolution: */
1381 CERROR("Can't resolve addr for %s: %d\n",
1382 libcfs_nid2str(peer_ni->ibp_nid), rc);
1389 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1390 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1391 rdma_destroy_id(cmid);
1394 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1398 kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
1400 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1401 char *reason = NULL;
1403 unsigned long flags;
1405 write_lock_irqsave(glock, flags);
1406 if (peer_ni->ibp_reconnecting == 0) {
1407 if (peer_ni->ibp_accepting)
1408 reason = "accepting";
1409 else if (peer_ni->ibp_connecting)
1410 reason = "connecting";
1411 else if (!list_empty(&peer_ni->ibp_conns))
1412 reason = "connected";
1413 else /* connected then closed */
1419 if (peer_ni->ibp_accepting)
1420 CNETERR("Detecting race between accepting and reconnecting\n");
1421 peer_ni->ibp_reconnecting--;
1423 if (!kiblnd_peer_active(peer_ni)) {
1424 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1425 reason = "unlinked";
1429 peer_ni->ibp_connecting++;
1430 peer_ni->ibp_reconnected++;
1432 write_unlock_irqrestore(glock, flags);
1434 kiblnd_connect_peer(peer_ni);
1438 write_unlock_irqrestore(glock, flags);
1440 CWARN("Abort reconnection of %s: %s\n",
1441 libcfs_nid2str(peer_ni->ibp_nid), reason);
1442 kiblnd_txlist_done(&txs, -ECONNABORTED,
1443 LNET_MSG_STATUS_LOCAL_ABORTED);
1448 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1450 struct kib_peer_ni *peer_ni;
1451 struct kib_peer_ni *peer2;
1452 struct kib_conn *conn;
1453 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1454 unsigned long flags;
1457 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1459 /* If I get here, I've committed to send, so I complete the tx with
1460 * failure on any problems */
1462 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1463 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1465 /* First time, just use a read lock since I expect to find my peer_ni
1467 read_lock_irqsave(g_lock, flags);
1469 peer_ni = kiblnd_find_peer_locked(ni, nid);
1470 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1471 /* Found a peer_ni with an established connection */
1472 conn = kiblnd_get_conn_locked(peer_ni);
1473 kiblnd_conn_addref(conn); /* 1 ref for me... */
1475 read_unlock_irqrestore(g_lock, flags);
1478 kiblnd_queue_tx(tx, conn);
1479 kiblnd_conn_decref(conn); /* ...to here */
1483 read_unlock(g_lock);
1484 /* Re-try with a write lock */
1487 peer_ni = kiblnd_find_peer_locked(ni, nid);
1488 if (peer_ni != NULL) {
1489 if (list_empty(&peer_ni->ibp_conns)) {
1490 /* found a peer_ni, but it's still connecting... */
1491 LASSERT(kiblnd_peer_connecting(peer_ni));
1493 list_add_tail(&tx->tx_list,
1494 &peer_ni->ibp_tx_queue);
1495 write_unlock_irqrestore(g_lock, flags);
1497 conn = kiblnd_get_conn_locked(peer_ni);
1498 kiblnd_conn_addref(conn); /* 1 ref for me... */
1500 write_unlock_irqrestore(g_lock, flags);
1503 kiblnd_queue_tx(tx, conn);
1504 kiblnd_conn_decref(conn); /* ...to here */
1509 write_unlock_irqrestore(g_lock, flags);
1511 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1512 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1514 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1516 tx->tx_status = -EHOSTUNREACH;
1518 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1524 write_lock_irqsave(g_lock, flags);
1526 peer2 = kiblnd_find_peer_locked(ni, nid);
1527 if (peer2 != NULL) {
1528 if (list_empty(&peer2->ibp_conns)) {
1529 /* found a peer_ni, but it's still connecting... */
1530 LASSERT(kiblnd_peer_connecting(peer2));
1532 list_add_tail(&tx->tx_list,
1533 &peer2->ibp_tx_queue);
1534 write_unlock_irqrestore(g_lock, flags);
1536 conn = kiblnd_get_conn_locked(peer2);
1537 kiblnd_conn_addref(conn); /* 1 ref for me... */
1539 write_unlock_irqrestore(g_lock, flags);
1542 kiblnd_queue_tx(tx, conn);
1543 kiblnd_conn_decref(conn); /* ...to here */
1546 kiblnd_peer_decref(peer_ni);
1550 /* Brand new peer_ni */
1551 LASSERT(peer_ni->ibp_connecting == 0);
1552 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1553 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1555 /* always called with a ref on ni, which prevents ni being shutdown */
1556 LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);
1559 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1561 kiblnd_peer_addref(peer_ni);
1562 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1564 write_unlock_irqrestore(g_lock, flags);
1566 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1567 kiblnd_connect_peer(peer_ni);
1568 kiblnd_peer_decref(peer_ni);
1572 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1574 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1575 int type = lntmsg->msg_type;
1576 struct lnet_process_id target = lntmsg->msg_target;
1577 int target_is_router = lntmsg->msg_target_is_router;
1578 int routing = lntmsg->msg_routing;
1579 unsigned int payload_niov = lntmsg->msg_niov;
1580 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1581 unsigned int payload_offset = lntmsg->msg_offset;
1582 unsigned int payload_nob = lntmsg->msg_len;
1583 struct kib_msg *ibmsg;
1584 struct kib_rdma_desc *rd;
1589 /* NB 'private' is different depending on what we're sending.... */
1591 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1592 payload_nob, payload_niov, libcfs_id2str(target));
1594 LASSERT (payload_nob == 0 || payload_niov > 0);
1595 LASSERT (payload_niov <= LNET_MAX_IOV);
1597 /* Thread context */
1598 LASSERT (!in_interrupt());
1606 LASSERT (payload_nob == 0);
1610 if (routing || target_is_router)
1611 break; /* send IMMEDIATE */
1613 /* is the REPLY message too small for RDMA? */
1614 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1615 if (nob <= IBLND_MSG_SIZE)
1616 break; /* send IMMEDIATE */
1618 tx = kiblnd_get_idle_tx(ni, target.nid);
1620 CERROR("Can't allocate txd for GET to %s\n",
1621 libcfs_nid2str(target.nid));
1626 rd = &ibmsg->ibm_u.get.ibgm_rd;
1627 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1628 lntmsg->msg_md->md_niov,
1629 lntmsg->msg_md->md_kiov,
1630 0, lntmsg->msg_md->md_length);
1632 CERROR("Can't setup GET sink for %s: %d\n",
1633 libcfs_nid2str(target.nid), rc);
1634 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1639 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1640 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1641 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1643 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1645 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1646 if (tx->tx_lntmsg[1] == NULL) {
1647 CERROR("Can't create reply for GET -> %s\n",
1648 libcfs_nid2str(target.nid));
1653 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1654 tx->tx_waiting = 1; /* waiting for GET_DONE */
1655 kiblnd_launch_tx(ni, tx, target.nid);
1658 case LNET_MSG_REPLY:
1660 /* Is the payload small enough not to need RDMA? */
1661 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1662 if (nob <= IBLND_MSG_SIZE)
1663 break; /* send IMMEDIATE */
1665 tx = kiblnd_get_idle_tx(ni, target.nid);
1667 CERROR("Can't allocate %s txd for %s\n",
1668 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1669 libcfs_nid2str(target.nid));
1673 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1674 payload_niov, payload_kiov,
1675 payload_offset, payload_nob);
1677 CERROR("Can't setup PUT src for %s: %d\n",
1678 libcfs_nid2str(target.nid), rc);
1684 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1685 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1686 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
1687 sizeof(struct kib_putreq_msg));
1689 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1690 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1691 kiblnd_launch_tx(ni, tx, target.nid);
1695 /* send IMMEDIATE */
1696 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1699 tx = kiblnd_get_idle_tx(ni, target.nid);
1701 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1702 type, libcfs_nid2str(target.nid));
1707 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1709 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1710 offsetof(struct kib_msg,
1711 ibm_u.immediate.ibim_payload),
1712 payload_niov, payload_kiov,
1713 payload_offset, payload_nob);
1715 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1716 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1718 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1719 kiblnd_launch_tx(ni, tx, target.nid);
1724 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1726 struct lnet_process_id target = lntmsg->msg_target;
1727 unsigned int niov = lntmsg->msg_niov;
1728 struct bio_vec *kiov = lntmsg->msg_kiov;
1729 unsigned int offset = lntmsg->msg_offset;
1730 unsigned int nob = lntmsg->msg_len;
1734 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1736 CERROR("Can't get tx for REPLY to %s\n",
1737 libcfs_nid2str(target.nid));
1744 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1745 niov, kiov, offset, nob);
1748 CERROR("Can't setup GET src for %s: %d\n",
1749 libcfs_nid2str(target.nid), rc);
1753 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1754 IBLND_MSG_GET_DONE, nob,
1755 &rx->rx_msg->ibm_u.get.ibgm_rd,
1756 rx->rx_msg->ibm_u.get.ibgm_cookie);
1758 CERROR("Can't setup rdma for GET from %s: %d\n",
1759 libcfs_nid2str(target.nid), rc);
1764 /* No RDMA: local completion may happen now! */
1765 lnet_finalize(lntmsg, 0);
1767 /* RDMA: lnet_finalize(lntmsg) when it
1769 tx->tx_lntmsg[0] = lntmsg;
1772 kiblnd_queue_tx(tx, rx->rx_conn);
1777 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1780 lnet_finalize(lntmsg, -EIO);
1784 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1785 int delayed, unsigned int niov, struct bio_vec *kiov,
1786 unsigned int offset, unsigned int mlen, unsigned int rlen)
1788 struct kib_rx *rx = private;
1789 struct kib_msg *rxmsg = rx->rx_msg;
1790 struct kib_conn *conn = rx->rx_conn;
1794 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1797 LASSERT (mlen <= rlen);
1798 LASSERT (!in_interrupt());
1800 switch (rxmsg->ibm_type) {
1804 case IBLND_MSG_IMMEDIATE:
1805 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1806 if (nob > rx->rx_nob) {
1807 CERROR ("Immediate message from %s too big: %d(%d)\n",
1808 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1814 lnet_copy_flat2kiov(niov, kiov, offset,
1815 IBLND_MSG_SIZE, rxmsg,
1816 offsetof(struct kib_msg,
1817 ibm_u.immediate.ibim_payload),
1819 lnet_finalize(lntmsg, 0);
1822 case IBLND_MSG_PUT_REQ: {
1823 struct kib_msg *txmsg;
1824 struct kib_rdma_desc *rd;
1825 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1828 lnet_finalize(lntmsg, 0);
1829 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1834 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1836 CERROR("Can't allocate tx for %s\n",
1837 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1838 /* Not replying will break the connection */
1844 rd = &txmsg->ibm_u.putack.ibpam_rd;
1845 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1846 niov, kiov, offset, mlen);
1848 CERROR("Can't setup PUT sink for %s: %d\n",
1849 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1850 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1852 /* tell peer_ni it's over */
1853 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1858 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1859 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1860 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1862 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1864 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1865 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1866 kiblnd_queue_tx(tx, conn);
1868 /* reposted buffer reserved for PUT_DONE */
1869 post_credit = IBLND_POSTRX_NO_CREDIT;
1873 case IBLND_MSG_GET_REQ:
1874 if (lntmsg != NULL) {
1875 /* Optimized GET; RDMA lntmsg's payload */
1876 kiblnd_reply(ni, rx, lntmsg);
1878 /* GET didn't match anything */
1879 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1881 rxmsg->ibm_u.get.ibgm_cookie);
1886 kiblnd_post_rx(rx, post_credit);
1891 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1893 struct task_struct *task = kthread_run(fn, arg, name);
1896 return PTR_ERR(task);
1898 atomic_inc(&kiblnd_data.kib_nthreads);
1903 kiblnd_thread_fini (void)
1905 atomic_dec (&kiblnd_data.kib_nthreads);
1909 kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
1911 /* This is racy, but everyone's only writing ktime_get_seconds() */
1912 peer_ni->ibp_last_alive = ktime_get_seconds();
1917 kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
1920 time64_t last_alive = 0;
1921 unsigned long flags;
1923 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1925 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1926 error = peer_ni->ibp_error;
1927 peer_ni->ibp_error = 0;
1929 last_alive = peer_ni->ibp_last_alive;
1932 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1935 lnet_notify(peer_ni->ibp_ni,
1936 peer_ni->ibp_nid, false, false, last_alive);
1940 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
1942 /* This just does the immediate housekeeping. 'error' is zero for a
1943 * normal shutdown which can happen only after the connection has been
1944 * established. If the connection is established, schedule the
1945 * connection to be finished off by the connd. Otherwise the connd is
1946 * already dealing with it (either to set it up or tear it down).
1947 * Caller holds kib_global_lock exclusively in irq context */
1948 struct kib_peer_ni *peer_ni = conn->ibc_peer;
1949 struct kib_dev *dev;
1950 unsigned long flags;
1952 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1954 if (error != 0 && conn->ibc_comms_error == 0)
1955 conn->ibc_comms_error = error;
1957 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1958 return; /* already being handled */
1961 list_empty(&conn->ibc_tx_noops) &&
1962 list_empty(&conn->ibc_tx_queue) &&
1963 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1964 list_empty(&conn->ibc_tx_queue_nocred) &&
1965 list_empty(&conn->ibc_active_txs)) {
1966 CDEBUG(D_NET, "closing conn to %s\n",
1967 libcfs_nid2str(peer_ni->ibp_nid));
1969 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1970 libcfs_nid2str(peer_ni->ibp_nid), error,
1971 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1972 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1973 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1974 "" : "(sending_rsrvd)",
1975 list_empty(&conn->ibc_tx_queue_nocred) ?
1976 "" : "(sending_nocred)",
1977 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1980 dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
1981 if (peer_ni->ibp_next_conn == conn)
1982 /* clear next_conn so it won't be used */
1983 peer_ni->ibp_next_conn = NULL;
1984 list_del(&conn->ibc_list);
1985 /* connd (see below) takes over ibc_list's ref */
1987 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
1988 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
1989 kiblnd_unlink_peer_locked(peer_ni);
1991 /* set/clear error on last conn */
1992 peer_ni->ibp_error = conn->ibc_comms_error;
1995 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1998 kiblnd_dev_can_failover(dev)) {
1999 list_add_tail(&dev->ibd_fail_list,
2000 &kiblnd_data.kib_failed_devs);
2001 wake_up(&kiblnd_data.kib_failover_waitq);
2004 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2006 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2007 wake_up(&kiblnd_data.kib_connd_waitq);
2009 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2013 kiblnd_close_conn(struct kib_conn *conn, int error)
2015 unsigned long flags;
2017 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2019 kiblnd_close_conn_locked(conn, error);
2021 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2025 kiblnd_handle_early_rxs(struct kib_conn *conn)
2027 unsigned long flags;
2030 LASSERT(!in_interrupt());
2031 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2033 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2034 while (!list_empty(&conn->ibc_early_rxs)) {
2035 rx = list_entry(conn->ibc_early_rxs.next,
2036 struct kib_rx, rx_list);
2037 list_del(&rx->rx_list);
2038 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2040 kiblnd_handle_rx(rx);
2042 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2044 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2048 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
2051 struct list_head *tmp;
2052 struct list_head *nxt;
2055 spin_lock(&conn->ibc_lock);
2057 list_for_each_safe(tmp, nxt, txs) {
2058 tx = list_entry(tmp, struct kib_tx, tx_list);
2060 if (txs == &conn->ibc_active_txs) {
2061 LASSERT(!tx->tx_queued);
2062 LASSERT(tx->tx_waiting ||
2063 tx->tx_sending != 0);
2064 if (conn->ibc_comms_error == -ETIMEDOUT) {
2065 if (tx->tx_waiting && !tx->tx_sending)
2067 LNET_MSG_STATUS_REMOTE_TIMEOUT;
2068 else if (tx->tx_sending)
2070 LNET_MSG_STATUS_NETWORK_TIMEOUT;
2073 LASSERT(tx->tx_queued);
2074 if (conn->ibc_comms_error == -ETIMEDOUT)
2075 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2077 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
2080 tx->tx_status = -ECONNABORTED;
2084 * TODO: This makes an assumption that
2085 * kiblnd_tx_complete() will be called for each tx. If
2086 * that event is dropped we could end up with stale
2087 * connections floating around. We'd like to deal with
2088 * that in a better way.
2090 * Also that means we can exceed the timeout by many
2093 if (tx->tx_sending == 0) {
2095 list_move(&tx->tx_list, &zombies);
2099 spin_unlock(&conn->ibc_lock);
2102 * aborting transmits occurs when finalizing the connection.
2103 * The connection is finalized on error.
2104 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
2105 * override the value already set in tx->tx_hstatus above.
2107 kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
2111 kiblnd_finalise_conn(struct kib_conn *conn)
2113 LASSERT (!in_interrupt());
2114 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2116 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2117 * for connections that didn't get as far as being connected, because
2118 * rdma_disconnect() does this for free. */
2119 kiblnd_abort_receives(conn);
2121 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2123 /* Complete all tx descs not waiting for sends to complete.
2124 * NB we should be safe from RDMA now that the QP has changed state */
2126 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2127 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2128 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2129 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2130 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2132 kiblnd_handle_early_rxs(conn);
2136 kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
2140 unsigned long flags;
2142 LASSERT (error != 0);
2143 LASSERT (!in_interrupt());
2145 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2148 LASSERT(peer_ni->ibp_connecting > 0);
2149 peer_ni->ibp_connecting--;
2151 LASSERT (peer_ni->ibp_accepting > 0);
2152 peer_ni->ibp_accepting--;
2155 if (kiblnd_peer_connecting(peer_ni)) {
2156 /* another connection attempt under way... */
2157 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2162 peer_ni->ibp_reconnected = 0;
2163 if (list_empty(&peer_ni->ibp_conns)) {
2164 /* Take peer_ni's blocked transmits to complete with error */
2165 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2167 if (kiblnd_peer_active(peer_ni))
2168 kiblnd_unlink_peer_locked(peer_ni);
2170 peer_ni->ibp_error = error;
2172 /* Can't have blocked transmits if there are connections */
2173 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2176 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2178 kiblnd_peer_notify(peer_ni);
2180 if (list_empty(&zombies))
2183 CNETERR("Deleting messages for %s: connection failed\n",
2184 libcfs_nid2str(peer_ni->ibp_nid));
2186 kiblnd_txlist_done(&zombies, error,
2187 LNET_MSG_STATUS_LOCAL_DROPPED);
2191 kiblnd_connreq_done(struct kib_conn *conn, int status)
2193 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2196 unsigned long flags;
2199 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2201 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2202 libcfs_nid2str(peer_ni->ibp_nid), active,
2203 conn->ibc_version, status);
2205 LASSERT (!in_interrupt());
2206 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2207 peer_ni->ibp_connecting > 0) ||
2208 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2209 peer_ni->ibp_accepting > 0));
2211 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2212 conn->ibc_connvars = NULL;
2215 /* failed to establish connection */
2216 kiblnd_peer_connect_failed(peer_ni, active, status);
2217 kiblnd_finalise_conn(conn);
2221 /* connection established */
2222 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2224 conn->ibc_last_send = ktime_get();
2225 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2226 kiblnd_peer_alive(peer_ni);
2228 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2229 * peer_ni instance... */
2230 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2231 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2232 peer_ni->ibp_reconnected = 0;
2234 peer_ni->ibp_connecting--;
2236 peer_ni->ibp_accepting--;
2238 if (peer_ni->ibp_version == 0) {
2239 peer_ni->ibp_version = conn->ibc_version;
2240 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2243 if (peer_ni->ibp_version != conn->ibc_version ||
2244 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2245 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2246 conn->ibc_incarnation);
2247 peer_ni->ibp_version = conn->ibc_version;
2248 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2251 /* grab pending txs while I have the lock */
2252 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2254 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2255 conn->ibc_comms_error != 0) { /* error has happened already */
2257 /* start to shut down connection */
2258 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2259 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2261 kiblnd_txlist_done(&txs, -ECONNABORTED,
2262 LNET_MSG_STATUS_LOCAL_ERROR);
2267 /* +1 ref for myself, this connection is visible to other threads
2268 * now, refcount of peer:ibp_conns can be released by connection
2269 * close from either a different thread, or the calling of
2270 * kiblnd_check_sends_locked() below. See bz21911 for details.
2272 kiblnd_conn_addref(conn);
2273 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2275 /* Schedule blocked txs
2276 * Note: if we are running with conns_per_peer > 1, these blocked
2277 * txs will all get scheduled to the first connection which gets
2278 * scheduled. We won't be using round robin on this first batch.
2280 spin_lock(&conn->ibc_lock);
2281 while (!list_empty(&txs)) {
2282 tx = list_entry(txs.next, struct kib_tx, tx_list);
2283 list_del(&tx->tx_list);
2285 kiblnd_queue_tx_locked(tx, conn);
2287 kiblnd_check_sends_locked(conn);
2288 spin_unlock(&conn->ibc_lock);
2290 /* schedule blocked rxs */
2291 kiblnd_handle_early_rxs(conn);
2292 kiblnd_conn_decref(conn);
2296 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2300 rc = rdma_reject(cmid, rej, sizeof(*rej));
2303 CWARN("Error %d sending reject\n", rc);
2307 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2309 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2310 struct kib_msg *reqmsg = priv;
2311 struct kib_msg *ackmsg;
2312 struct kib_dev *ibdev;
2313 struct kib_peer_ni *peer_ni;
2314 struct kib_peer_ni *peer2;
2315 struct kib_conn *conn;
2316 struct lnet_ni *ni = NULL;
2317 struct kib_net *net = NULL;
2319 struct rdma_conn_param cp;
2321 int version = IBLND_MSG_VERSION;
2322 unsigned long flags;
2324 struct sockaddr_in *peer_addr;
2325 LASSERT (!in_interrupt());
2327 /* cmid inherits 'context' from the corresponding listener id */
2328 ibdev = cmid->context;
2331 memset(&rej, 0, sizeof(rej));
2332 rej.ibr_magic = IBLND_MSG_MAGIC;
2333 rej.ibr_why = IBLND_REJECT_FATAL;
2334 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2336 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2337 if (*kiblnd_tunables.kib_require_priv_port &&
2338 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2339 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2340 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2341 &ip, ntohs(peer_addr->sin_port));
2345 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2346 CERROR("Short connection request\n");
2350 /* Future protocol version compatibility support! If the
2351 * o2iblnd-specific protocol changes, or when LNET unifies
2352 * protocols over all LNDs, the initial connection will
2353 * negotiate a protocol version. I trap this here to avoid
2354 * console errors; the reject tells the peer_ni which protocol I
2356 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2357 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2359 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2360 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2361 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2363 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2364 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2365 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2368 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2370 CERROR("Can't parse connection request: %d\n", rc);
2374 nid = reqmsg->ibm_srcnid;
2375 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2378 net = (struct kib_net *)ni->ni_data;
2379 rej.ibr_incarnation = net->ibn_incarnation;
2382 if (ni == NULL || /* no matching net */
2383 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2384 net->ibn_dev != ibdev) { /* wrong device */
2385 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2386 "bad dst nid %s\n", libcfs_nid2str(nid),
2387 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2388 ibdev->ibd_ifname, ibdev->ibd_nnets,
2390 libcfs_nid2str(reqmsg->ibm_dstnid));
2395 /* check time stamp as soon as possible */
2396 if (reqmsg->ibm_dststamp != 0 &&
2397 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2398 CWARN("Stale connection request\n");
2399 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2403 /* I can accept peer_ni's version */
2404 version = reqmsg->ibm_version;
2406 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2407 CERROR("Unexpected connreq msg type: %x from %s\n",
2408 reqmsg->ibm_type, libcfs_nid2str(nid));
2412 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2413 kiblnd_msg_queue_size(version, ni)) {
2414 CERROR("Can't accept conn from %s, queue depth too large: "
2415 " %d (<=%d wanted)\n",
2416 libcfs_nid2str(nid),
2417 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2418 kiblnd_msg_queue_size(version, ni));
2420 if (version == IBLND_MSG_VERSION)
2421 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2426 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2427 IBLND_MAX_RDMA_FRAGS) {
2428 CWARN("Can't accept conn from %s (version %x): "
2429 "max_frags %d too large (%d wanted)\n",
2430 libcfs_nid2str(nid), version,
2431 reqmsg->ibm_u.connparams.ibcp_max_frags,
2432 IBLND_MAX_RDMA_FRAGS);
2434 if (version >= IBLND_MSG_VERSION)
2435 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2438 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2439 IBLND_MAX_RDMA_FRAGS &&
2440 net->ibn_fmr_ps == NULL) {
2441 CWARN("Can't accept conn from %s (version %x): "
2442 "max_frags %d incompatible without FMR pool "
2444 libcfs_nid2str(nid), version,
2445 reqmsg->ibm_u.connparams.ibcp_max_frags,
2446 IBLND_MAX_RDMA_FRAGS);
2448 if (version == IBLND_MSG_VERSION)
2449 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2454 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2455 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2456 libcfs_nid2str(nid),
2457 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2462 /* assume 'nid' is a new peer_ni; create */
2463 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2465 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2466 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2470 /* We have validated the peer's parameters so use those */
2471 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2472 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2474 write_lock_irqsave(g_lock, flags);
2476 peer2 = kiblnd_find_peer_locked(ni, nid);
2477 if (peer2 != NULL) {
2478 if (peer2->ibp_version == 0) {
2479 peer2->ibp_version = version;
2480 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2483 /* not the guy I've talked with */
2484 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2485 peer2->ibp_version != version) {
2486 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2488 if (kiblnd_peer_active(peer2)) {
2489 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2490 peer2->ibp_version = version;
2492 write_unlock_irqrestore(g_lock, flags);
2494 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2495 libcfs_nid2str(nid), peer2->ibp_version, version,
2496 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2498 kiblnd_peer_decref(peer_ni);
2499 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2503 /* Tie-break connection race in favour of the higher NID.
2504 * If we keep running into a race condition multiple times,
2505 * we have to assume that the connection attempt with the
2506 * higher NID is stuck in a connecting state and will never
2507 * recover. As such, we pass through this if-block and let
2508 * the lower NID connection win so we can move forward.
2510 if (peer2->ibp_connecting != 0 &&
2511 nid < ni->ni_nid && peer2->ibp_races <
2512 MAX_CONN_RACES_BEFORE_ABORT) {
2514 write_unlock_irqrestore(g_lock, flags);
2516 CDEBUG(D_NET, "Conn race %s\n",
2517 libcfs_nid2str(peer2->ibp_nid));
2519 kiblnd_peer_decref(peer_ni);
2520 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2523 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2524 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2525 libcfs_nid2str(peer2->ibp_nid),
2526 MAX_CONN_RACES_BEFORE_ABORT);
2528 * passive connection is allowed even this peer_ni is waiting for
2531 peer2->ibp_reconnecting = 0;
2532 peer2->ibp_races = 0;
2533 peer2->ibp_accepting++;
2534 kiblnd_peer_addref(peer2);
2536 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2537 * so copy validated parameters since we now know what the
2538 * peer_ni's limits are */
2539 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2540 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2542 write_unlock_irqrestore(g_lock, flags);
2543 kiblnd_peer_decref(peer_ni);
2546 /* Brand new peer_ni */
2547 LASSERT (peer_ni->ibp_accepting == 0);
2548 LASSERT (peer_ni->ibp_version == 0 &&
2549 peer_ni->ibp_incarnation == 0);
2551 peer_ni->ibp_accepting = 1;
2552 peer_ni->ibp_version = version;
2553 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2555 /* I have a ref on ni that prevents it being shutdown */
2556 LASSERT (net->ibn_shutdown == 0);
2558 kiblnd_peer_addref(peer_ni);
2559 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2561 write_unlock_irqrestore(g_lock, flags);
2564 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2566 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2567 kiblnd_peer_decref(peer_ni);
2568 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2572 /* conn now "owns" cmid, so I return success from here on to ensure the
2573 * CM callback doesn't destroy cmid. */
2574 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2575 conn->ibc_credits = conn->ibc_queue_depth;
2576 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2577 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2578 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2580 ackmsg = &conn->ibc_connvars->cv_msg;
2581 memset(ackmsg, 0, sizeof(*ackmsg));
2583 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2584 sizeof(ackmsg->ibm_u.connparams));
2585 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2586 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2587 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2589 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2591 memset(&cp, 0, sizeof(cp));
2592 cp.private_data = ackmsg;
2593 cp.private_data_len = ackmsg->ibm_nob;
2594 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2595 cp.initiator_depth = 0;
2596 cp.flow_control = 1;
2597 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2598 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2600 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2602 rc = rdma_accept(cmid, &cp);
2604 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2605 rej.ibr_version = version;
2606 rej.ibr_why = IBLND_REJECT_FATAL;
2608 kiblnd_reject(cmid, &rej);
2609 kiblnd_connreq_done(conn, rc);
2610 kiblnd_conn_decref(conn);
2618 rej.ibr_cp.ibcp_queue_depth =
2619 kiblnd_msg_queue_size(version, ni);
2620 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2624 rej.ibr_version = version;
2625 kiblnd_reject(cmid, &rej);
2627 return -ECONNREFUSED;
2631 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2632 u64 incarnation, int why, struct kib_connparams *cp)
2634 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2635 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2637 int msg_size = IBLND_MSG_SIZE;
2641 unsigned long flags;
2643 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2644 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2647 msg_size = cp->ibcp_max_msg_size;
2648 frag_num = cp->ibcp_max_frags;
2649 queue_dep = cp->ibcp_queue_depth;
2652 write_lock_irqsave(glock, flags);
2653 /* retry connection if it's still needed and no other connection
2654 * attempts (active or passive) are in progress
2655 * NB: reconnect is still needed even when ibp_tx_queue is
2656 * empty if ibp_version != version because reconnect may be
2659 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2660 peer_ni->ibp_version != version) &&
2661 peer_ni->ibp_connecting &&
2662 peer_ni->ibp_accepting == 0;
2673 case IBLND_REJECT_RDMA_FRAGS: {
2674 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2677 reason = "can't negotiate max frags";
2680 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2681 #ifdef HAVE_IB_GET_DMA_MR
2683 * This check only makes sense if the kernel supports global
2684 * memory registration. Otherwise, map_on_demand will never == 0
2686 if (!tunables->lnd_map_on_demand) {
2687 reason = "map_on_demand must be enabled";
2691 if (conn->ibc_max_frags <= frag_num) {
2692 reason = "unsupported max frags";
2696 peer_ni->ibp_max_frags = frag_num;
2697 reason = "rdma fragments";
2700 case IBLND_REJECT_MSG_QUEUE_SIZE:
2702 reason = "can't negotiate queue depth";
2705 if (conn->ibc_queue_depth <= queue_dep) {
2706 reason = "unsupported queue depth";
2710 peer_ni->ibp_queue_depth = queue_dep;
2711 reason = "queue depth";
2714 case IBLND_REJECT_CONN_STALE:
2718 case IBLND_REJECT_CONN_RACE:
2719 reason = "conn race";
2722 case IBLND_REJECT_CONN_UNCOMPAT:
2723 reason = "version negotiation";
2726 case IBLND_REJECT_INVALID_SRV_ID:
2727 reason = "invalid service id";
2731 conn->ibc_reconnect = 1;
2732 peer_ni->ibp_reconnecting++;
2733 peer_ni->ibp_version = version;
2734 if (incarnation != 0)
2735 peer_ni->ibp_incarnation = incarnation;
2737 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2739 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2740 libcfs_nid2str(peer_ni->ibp_nid),
2741 reconnect ? "reconnect" : "don't reconnect",
2742 reason, IBLND_MSG_VERSION, version, msg_size,
2743 conn->ibc_queue_depth, queue_dep,
2744 conn->ibc_max_frags, frag_num);
2746 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2747 * while destroying the zombie
2752 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2754 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2756 LASSERT (!in_interrupt());
2757 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2760 case IB_CM_REJ_STALE_CONN:
2761 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2762 IBLND_REJECT_CONN_STALE, NULL);
2765 case IB_CM_REJ_INVALID_SERVICE_ID:
2766 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2767 IBLND_REJECT_INVALID_SRV_ID, NULL);
2768 CNETERR("%s rejected: no listener at %d\n",
2769 libcfs_nid2str(peer_ni->ibp_nid),
2770 *kiblnd_tunables.kib_service);
2773 case IB_CM_REJ_CONSUMER_DEFINED:
2774 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2775 struct kib_rej *rej = priv;
2776 struct kib_connparams *cp = NULL;
2778 __u64 incarnation = -1;
2780 /* NB. default incarnation is -1 because:
2781 * a) V1 will ignore dst incarnation in connreq.
2782 * b) V2 will provide incarnation while rejecting me,
2783 * -1 will be overwrote.
2785 * if I try to connect to a V1 peer_ni with V2 protocol,
2786 * it rejected me then upgrade to V2, I have no idea
2787 * about the upgrading and try to reconnect with V1,
2788 * in this case upgraded V2 can find out I'm trying to
2789 * talk to the old guy and reject me(incarnation is -1).
2792 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2793 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2794 __swab32s(&rej->ibr_magic);
2795 __swab16s(&rej->ibr_version);
2799 if (priv_nob >= sizeof(struct kib_rej) &&
2800 rej->ibr_version > IBLND_MSG_VERSION_1) {
2801 /* priv_nob is always 148 in current version
2802 * of OFED, so we still need to check version.
2803 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2807 __swab64s(&rej->ibr_incarnation);
2808 __swab16s(&cp->ibcp_queue_depth);
2809 __swab16s(&cp->ibcp_max_frags);
2810 __swab32s(&cp->ibcp_max_msg_size);
2813 incarnation = rej->ibr_incarnation;
2816 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2817 rej->ibr_magic != LNET_PROTO_MAGIC) {
2818 CERROR("%s rejected: consumer defined fatal error\n",
2819 libcfs_nid2str(peer_ni->ibp_nid));
2823 if (rej->ibr_version != IBLND_MSG_VERSION &&
2824 rej->ibr_version != IBLND_MSG_VERSION_1) {
2825 CERROR("%s rejected: o2iblnd version %x error\n",
2826 libcfs_nid2str(peer_ni->ibp_nid),
2831 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2832 rej->ibr_version == IBLND_MSG_VERSION_1) {
2833 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2834 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2836 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2837 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2840 switch (rej->ibr_why) {
2841 case IBLND_REJECT_CONN_RACE:
2842 case IBLND_REJECT_CONN_STALE:
2843 case IBLND_REJECT_CONN_UNCOMPAT:
2844 case IBLND_REJECT_MSG_QUEUE_SIZE:
2845 case IBLND_REJECT_RDMA_FRAGS:
2846 kiblnd_check_reconnect(conn, rej->ibr_version,
2847 incarnation, rej->ibr_why, cp);
2850 case IBLND_REJECT_NO_RESOURCES:
2851 CERROR("%s rejected: o2iblnd no resources\n",
2852 libcfs_nid2str(peer_ni->ibp_nid));
2855 case IBLND_REJECT_FATAL:
2856 CERROR("%s rejected: o2iblnd fatal error\n",
2857 libcfs_nid2str(peer_ni->ibp_nid));
2861 CERROR("%s rejected: o2iblnd reason %d\n",
2862 libcfs_nid2str(peer_ni->ibp_nid),
2870 CNETERR("%s rejected: reason %d, size %d\n",
2871 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2875 kiblnd_connreq_done(conn, -ECONNREFUSED);
2879 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2881 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2882 struct lnet_ni *ni = peer_ni->ibp_ni;
2883 struct kib_net *net = ni->ni_data;
2884 struct kib_msg *msg = priv;
2885 int ver = conn->ibc_version;
2886 int rc = kiblnd_unpack_msg(msg, priv_nob);
2887 unsigned long flags;
2889 LASSERT (net != NULL);
2892 CERROR("Can't unpack connack from %s: %d\n",
2893 libcfs_nid2str(peer_ni->ibp_nid), rc);
2897 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2898 CERROR("Unexpected message %d from %s\n",
2899 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2904 if (ver != msg->ibm_version) {
2905 CERROR("%s replied version %x is different with "
2906 "requested version %x\n",
2907 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2912 if (msg->ibm_u.connparams.ibcp_queue_depth >
2913 conn->ibc_queue_depth) {
2914 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2915 libcfs_nid2str(peer_ni->ibp_nid),
2916 msg->ibm_u.connparams.ibcp_queue_depth,
2917 conn->ibc_queue_depth);
2922 if (msg->ibm_u.connparams.ibcp_max_frags >
2923 conn->ibc_max_frags) {
2924 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2925 libcfs_nid2str(peer_ni->ibp_nid),
2926 msg->ibm_u.connparams.ibcp_max_frags,
2927 conn->ibc_max_frags);
2932 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2933 CERROR("%s max message size %d too big (%d max)\n",
2934 libcfs_nid2str(peer_ni->ibp_nid),
2935 msg->ibm_u.connparams.ibcp_max_msg_size,
2941 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2942 if (msg->ibm_dstnid == ni->ni_nid &&
2943 msg->ibm_dststamp == net->ibn_incarnation)
2947 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2950 CERROR("Bad connection reply from %s, rc = %d, "
2951 "version: %x max_frags: %d\n",
2952 libcfs_nid2str(peer_ni->ibp_nid), rc,
2953 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2957 conn->ibc_incarnation = msg->ibm_srcstamp;
2958 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2959 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2960 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2961 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2962 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2963 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2965 kiblnd_connreq_done(conn, 0);
2969 /* NB My QP has already established itself, so I handle anything going
2970 * wrong here by setting ibc_comms_error.
2971 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2972 * immediately tears it down. */
2975 conn->ibc_comms_error = rc;
2976 kiblnd_connreq_done(conn, 0);
2980 kiblnd_active_connect(struct rdma_cm_id *cmid)
2982 struct kib_peer_ni *peer_ni = cmid->context;
2983 struct kib_conn *conn;
2984 struct kib_msg *msg;
2985 struct rdma_conn_param cp;
2988 unsigned long flags;
2991 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2993 incarnation = peer_ni->ibp_incarnation;
2994 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
2995 peer_ni->ibp_version;
2997 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2999 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3002 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3003 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3007 /* conn "owns" cmid now, so I return success from here on to ensure the
3008 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3011 msg = &conn->ibc_connvars->cv_msg;
3013 memset(msg, 0, sizeof(*msg));
3014 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3015 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3016 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3017 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3019 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3020 0, peer_ni->ibp_nid, incarnation);
3022 memset(&cp, 0, sizeof(cp));
3023 cp.private_data = msg;
3024 cp.private_data_len = msg->ibm_nob;
3025 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3026 cp.initiator_depth = 0;
3027 cp.flow_control = 1;
3028 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3029 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3031 LASSERT(cmid->context == (void *)conn);
3032 LASSERT(conn->ibc_cmid == cmid);
3034 rc = rdma_connect(cmid, &cp);
3036 CERROR("Can't connect to %s: %d\n",
3037 libcfs_nid2str(peer_ni->ibp_nid), rc);
3038 kiblnd_connreq_done(conn, rc);
3039 kiblnd_conn_decref(conn);
3046 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3048 struct kib_peer_ni *peer_ni;
3049 struct kib_conn *conn;
3052 switch (event->event) {
3054 CERROR("Unexpected event: %d, status: %d\n",
3055 event->event, event->status);
3058 case RDMA_CM_EVENT_CONNECT_REQUEST:
3059 /* destroy cmid on failure */
3060 rc = kiblnd_passive_connect(cmid,
3061 (void *)KIBLND_CONN_PARAM(event),
3062 KIBLND_CONN_PARAM_LEN(event));
3063 CDEBUG(D_NET, "connreq: %d\n", rc);
3066 case RDMA_CM_EVENT_ADDR_ERROR:
3067 peer_ni = cmid->context;
3068 CNETERR("%s: ADDR ERROR %d\n",
3069 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3070 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3071 kiblnd_peer_decref(peer_ni);
3072 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3074 case RDMA_CM_EVENT_ADDR_RESOLVED:
3075 peer_ni = cmid->context;
3077 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3078 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3080 if (event->status != 0) {
3081 CNETERR("Can't resolve address for %s: %d\n",
3082 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3085 rc = rdma_resolve_route(
3086 cmid, kiblnd_timeout() * 1000);
3088 struct kib_net *net = peer_ni->ibp_ni->ni_data;
3089 struct kib_dev *dev = net->ibn_dev;
3091 CDEBUG(D_NET, "%s: connection bound to "\
3093 libcfs_nid2str(peer_ni->ibp_nid),
3095 &dev->ibd_ifip, cmid->device->name);
3100 /* Can't initiate route resolution */
3101 CERROR("Can't resolve route for %s: %d\n",
3102 libcfs_nid2str(peer_ni->ibp_nid), rc);
3104 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3105 kiblnd_peer_decref(peer_ni);
3106 return rc; /* rc != 0 destroys cmid */
3108 case RDMA_CM_EVENT_ROUTE_ERROR:
3109 peer_ni = cmid->context;
3110 CNETERR("%s: ROUTE ERROR %d\n",
3111 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3112 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3113 kiblnd_peer_decref(peer_ni);
3114 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3116 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3117 peer_ni = cmid->context;
3118 CDEBUG(D_NET,"%s Route resolved: %d\n",
3119 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3121 if (event->status == 0)
3122 return kiblnd_active_connect(cmid);
3124 CNETERR("Can't resolve route for %s: %d\n",
3125 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3126 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3127 kiblnd_peer_decref(peer_ni);
3128 return event->status; /* rc != 0 destroys cmid */
3130 case RDMA_CM_EVENT_UNREACHABLE:
3131 conn = cmid->context;
3132 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3133 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3134 CNETERR("%s: UNREACHABLE %d\n",
3135 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3136 kiblnd_connreq_done(conn, -ENETDOWN);
3137 kiblnd_conn_decref(conn);
3140 case RDMA_CM_EVENT_CONNECT_ERROR:
3141 conn = cmid->context;
3142 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3143 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3144 CNETERR("%s: CONNECT ERROR %d\n",
3145 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3146 kiblnd_connreq_done(conn, -ENOTCONN);
3147 kiblnd_conn_decref(conn);
3150 case RDMA_CM_EVENT_REJECTED:
3151 conn = cmid->context;
3152 switch (conn->ibc_state) {
3156 case IBLND_CONN_PASSIVE_WAIT:
3157 CERROR ("%s: REJECTED %d\n",
3158 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3160 kiblnd_connreq_done(conn, -ECONNRESET);
3163 case IBLND_CONN_ACTIVE_CONNECT:
3164 kiblnd_rejected(conn, event->status,
3165 (void *)KIBLND_CONN_PARAM(event),
3166 KIBLND_CONN_PARAM_LEN(event));
3169 kiblnd_conn_decref(conn);
3172 case RDMA_CM_EVENT_ESTABLISHED:
3173 conn = cmid->context;
3174 switch (conn->ibc_state) {
3178 case IBLND_CONN_PASSIVE_WAIT:
3179 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3180 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3181 kiblnd_connreq_done(conn, 0);
3184 case IBLND_CONN_ACTIVE_CONNECT:
3185 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3186 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3187 kiblnd_check_connreply(conn,
3188 (void *)KIBLND_CONN_PARAM(event),
3189 KIBLND_CONN_PARAM_LEN(event));
3192 /* net keeps its ref on conn! */
3195 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3196 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3199 case RDMA_CM_EVENT_DISCONNECTED:
3200 conn = cmid->context;
3201 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3202 CERROR("%s DISCONNECTED\n",
3203 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3204 kiblnd_connreq_done(conn, -ECONNRESET);
3206 kiblnd_close_conn(conn, 0);
3208 kiblnd_conn_decref(conn);
3209 cmid->context = NULL;
3212 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3213 LCONSOLE_ERROR_MSG(0x131,
3214 "Received notification of device removal\n"
3215 "Please shutdown LNET to allow this to proceed\n");
3216 /* Can't remove network from underneath LNET for now, so I have
3220 case RDMA_CM_EVENT_ADDR_CHANGE:
3221 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3227 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3230 struct list_head *ttmp;
3231 bool active_txs = strcmp(kiblnd_queue2str(conn, txs),
3234 list_for_each(ttmp, txs) {
3235 tx = list_entry(ttmp, struct kib_tx, tx_list);
3237 if (txs != &conn->ibc_active_txs) {
3238 LASSERT(tx->tx_queued);
3240 LASSERT(!tx->tx_queued);
3241 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3244 if (ktime_compare(ktime_get(), tx->tx_deadline) < 0)
3248 CERROR("Timed out tx: %s, "
3249 "outstanding RDMA time: %lld sec\n",
3250 kiblnd_queue2str(conn, txs),
3251 *kiblnd_tunables.kib_timeout +
3252 (ktime_ms_delta(ktime_get(),
3253 tx->tx_deadline) / MSEC_PER_SEC));
3255 CERROR("Timed out tx: %s, time in internal queue: %lld "
3256 "sec, time in active queue: %lld sec,"
3257 " outstanding RDMA time: %lld sec\n",
3258 kiblnd_queue2str(conn, txs),
3259 ktime_ms_delta(tx->tx_deadline,
3260 tx->tx_on_activeq) / MSEC_PER_SEC,
3261 ktime_ms_delta(ktime_get(),
3262 tx->tx_on_activeq) / MSEC_PER_SEC,
3263 *kiblnd_tunables.kib_timeout +
3264 (ktime_ms_delta(ktime_get(),
3265 tx->tx_deadline) / MSEC_PER_SEC));
3275 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3277 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3278 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3279 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3280 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3281 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3285 kiblnd_check_conns (int idx)
3288 LIST_HEAD(checksends);
3289 LIST_HEAD(timedout_txs);
3290 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3291 struct list_head *ptmp;
3292 struct kib_peer_ni *peer_ni;
3293 struct kib_conn *conn;
3294 struct kib_tx *tx, *tx_tmp;
3295 struct list_head *ctmp;
3296 unsigned long flags;
3298 /* NB. We expect to have a look at all the peers and not find any
3299 * RDMAs to time out, so we just use a shared lock while we
3301 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3303 list_for_each(ptmp, peers) {
3304 peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
3306 /* Check tx_deadline */
3307 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3308 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3309 CWARN("Timed out tx for %s: %lld seconds\n",
3310 libcfs_nid2str(peer_ni->ibp_nid),
3311 ktime_ms_delta(ktime_get(),
3312 tx->tx_deadline) / MSEC_PER_SEC);
3313 list_move(&tx->tx_list, &timedout_txs);
3317 list_for_each(ctmp, &peer_ni->ibp_conns) {
3321 conn = list_entry(ctmp, struct kib_conn, ibc_list);
3323 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3325 spin_lock(&conn->ibc_lock);
3327 sendnoop = kiblnd_need_noop(conn);
3328 timedout = kiblnd_conn_timed_out_locked(conn);
3329 if (!sendnoop && !timedout) {
3330 spin_unlock(&conn->ibc_lock);
3335 CERROR("Timed out RDMA with %s (%lld): "
3336 "c: %u, oc: %u, rc: %u\n",
3337 libcfs_nid2str(peer_ni->ibp_nid),
3338 ktime_get_seconds() - peer_ni->ibp_last_alive,
3340 conn->ibc_outstanding_credits,
3341 conn->ibc_reserved_credits);
3342 list_add(&conn->ibc_connd_list, &closes);
3344 list_add(&conn->ibc_connd_list, &checksends);
3346 /* +ref for 'closes' or 'checksends' */
3347 kiblnd_conn_addref(conn);
3349 spin_unlock(&conn->ibc_lock);
3353 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3355 if (!list_empty(&timedout_txs))
3356 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
3357 LNET_MSG_STATUS_LOCAL_TIMEOUT);
3359 /* Handle timeout by closing the whole
3360 * connection. We can only be sure RDMA activity
3361 * has ceased once the QP has been modified. */
3362 while (!list_empty(&closes)) {
3363 conn = list_entry(closes.next,
3364 struct kib_conn, ibc_connd_list);
3365 list_del(&conn->ibc_connd_list);
3366 kiblnd_close_conn(conn, -ETIMEDOUT);
3367 kiblnd_conn_decref(conn);
3370 /* In case we have enough credits to return via a
3371 * NOOP, but there were no non-blocking tx descs
3372 * free to do it last time... */
3373 while (!list_empty(&checksends)) {
3374 conn = list_entry(checksends.next,
3375 struct kib_conn, ibc_connd_list);
3376 list_del(&conn->ibc_connd_list);
3378 spin_lock(&conn->ibc_lock);
3379 kiblnd_check_sends_locked(conn);
3380 spin_unlock(&conn->ibc_lock);
3382 kiblnd_conn_decref(conn);
3387 kiblnd_disconnect_conn(struct kib_conn *conn)
3389 LASSERT (!in_interrupt());
3390 LASSERT (current == kiblnd_data.kib_connd);
3391 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3393 rdma_disconnect(conn->ibc_cmid);
3394 kiblnd_finalise_conn(conn);
3396 kiblnd_peer_notify(conn->ibc_peer);
3400 * High-water for reconnection to the same peer_ni, reconnection attempt should
3401 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3403 #define KIB_RECONN_HIGH_RACE 10
3405 * Allow connd to take a break and handle other things after consecutive
3406 * reconnection attemps.
3408 #define KIB_RECONN_BREAK 100
3411 kiblnd_connd (void *arg)
3413 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3414 wait_queue_entry_t wait;
3415 unsigned long flags;
3416 struct kib_conn *conn;
3421 unsigned long deadline = jiffies;
3423 init_waitqueue_entry(&wait, current);
3424 kiblnd_data.kib_connd = current;
3426 spin_lock_irqsave(lock, flags);
3428 while (!kiblnd_data.kib_shutdown) {
3433 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3434 struct kib_peer_ni *peer_ni = NULL;
3436 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3437 struct kib_conn, ibc_list);
3438 list_del(&conn->ibc_list);
3439 if (conn->ibc_reconnect) {
3440 peer_ni = conn->ibc_peer;
3441 kiblnd_peer_addref(peer_ni);
3444 spin_unlock_irqrestore(lock, flags);
3447 kiblnd_destroy_conn(conn);
3449 spin_lock_irqsave(lock, flags);
3451 LIBCFS_FREE(conn, sizeof(*conn));
3455 conn->ibc_peer = peer_ni;
3456 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3457 list_add_tail(&conn->ibc_list,
3458 &kiblnd_data.kib_reconn_list);
3460 list_add_tail(&conn->ibc_list,
3461 &kiblnd_data.kib_reconn_wait);
3464 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3465 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3466 struct kib_conn, ibc_list);
3467 list_del(&conn->ibc_list);
3469 spin_unlock_irqrestore(lock, flags);
3472 kiblnd_disconnect_conn(conn);
3473 kiblnd_conn_decref(conn);
3475 spin_lock_irqsave(lock, flags);
3478 while (reconn < KIB_RECONN_BREAK) {
3479 if (kiblnd_data.kib_reconn_sec !=
3480 ktime_get_real_seconds()) {
3481 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3482 list_splice_init(&kiblnd_data.kib_reconn_wait,
3483 &kiblnd_data.kib_reconn_list);
3486 if (list_empty(&kiblnd_data.kib_reconn_list))
3489 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3490 struct kib_conn, ibc_list);
3491 list_del(&conn->ibc_list);
3493 spin_unlock_irqrestore(lock, flags);
3496 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3497 kiblnd_peer_decref(conn->ibc_peer);
3498 LIBCFS_FREE(conn, sizeof(*conn));
3500 spin_lock_irqsave(lock, flags);
3503 /* careful with the jiffy wrap... */
3504 timeout = (int)(deadline - jiffies);
3508 int chunk = kiblnd_data.kib_peer_hash_size;
3509 unsigned int lnd_timeout;
3511 spin_unlock_irqrestore(lock, flags);
3514 /* Time to check for RDMA timeouts on a few more
3515 * peers: I do checks every 'p' seconds on a
3516 * proportion of the peer_ni table and I need to check
3517 * every connection 'n' times within a timeout
3518 * interval, to ensure I detect a timeout on any
3519 * connection within (n+1)/n times the timeout
3522 lnd_timeout = kiblnd_timeout();
3523 if (lnd_timeout > n * p)
3524 chunk = (chunk * n * p) / lnd_timeout;
3528 for (i = 0; i < chunk; i++) {
3529 kiblnd_check_conns(peer_index);
3530 peer_index = (peer_index + 1) %
3531 kiblnd_data.kib_peer_hash_size;
3534 deadline += cfs_time_seconds(p);
3535 spin_lock_irqsave(lock, flags);
3541 /* Nothing to do for 'timeout' */
3542 set_current_state(TASK_INTERRUPTIBLE);
3543 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3544 spin_unlock_irqrestore(lock, flags);
3546 schedule_timeout(timeout);
3548 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3549 spin_lock_irqsave(lock, flags);
3552 spin_unlock_irqrestore(lock, flags);
3554 kiblnd_thread_fini();
3559 kiblnd_qp_event(struct ib_event *event, void *arg)
3561 struct kib_conn *conn = arg;
3563 switch (event->event) {
3564 case IB_EVENT_COMM_EST:
3565 CDEBUG(D_NET, "%s established\n",
3566 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3567 /* We received a packet but connection isn't established
3568 * probably handshake packet was lost, so free to
3569 * force make connection established */
3570 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3573 case IB_EVENT_PORT_ERR:
3574 case IB_EVENT_DEVICE_FATAL:
3575 CERROR("Fatal device error for NI %s\n",
3576 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3577 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
3580 case IB_EVENT_PORT_ACTIVE:
3581 CERROR("Port reactivated for NI %s\n",
3582 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3583 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
3587 CERROR("%s: Async QP event type %d\n",
3588 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3594 kiblnd_complete (struct ib_wc *wc)
3596 switch (kiblnd_wreqid2type(wc->wr_id)) {
3601 if (wc->status != IB_WC_SUCCESS &&
3602 wc->status != IB_WC_WR_FLUSH_ERR)
3603 CNETERR("FastReg failed: %d\n", wc->status);
3606 case IBLND_WID_RDMA:
3607 /* We only get RDMA completion notification if it fails. All
3608 * subsequent work items, including the final SEND will fail
3609 * too. However we can't print out any more info about the
3610 * failing RDMA because 'tx' might be back on the idle list or
3611 * even reused already if we didn't manage to post all our work
3613 CNETERR("RDMA (tx: %p) failed: %d\n",
3614 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3618 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3622 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3629 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3631 /* NB I'm not allowed to schedule this conn once its refcount has
3632 * reached 0. Since fundamentally I'm racing with scheduler threads
3633 * consuming my CQ I could be called after all completions have
3634 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3635 * and this CQ is about to be destroyed so I NOOP. */
3636 struct kib_conn *conn = arg;
3637 struct kib_sched_info *sched = conn->ibc_sched;
3638 unsigned long flags;
3640 LASSERT(cq == conn->ibc_cq);
3642 spin_lock_irqsave(&sched->ibs_lock, flags);
3644 conn->ibc_ready = 1;
3646 if (!conn->ibc_scheduled &&
3647 (conn->ibc_nrx > 0 ||
3648 conn->ibc_nsends_posted > 0)) {
3649 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3650 conn->ibc_scheduled = 1;
3651 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3653 if (waitqueue_active(&sched->ibs_waitq))
3654 wake_up(&sched->ibs_waitq);
3657 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3661 kiblnd_cq_event(struct ib_event *event, void *arg)
3663 struct kib_conn *conn = arg;
3665 CERROR("%s: async CQ event type %d\n",
3666 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3670 kiblnd_scheduler(void *arg)
3672 long id = (long)arg;
3673 struct kib_sched_info *sched;
3674 struct kib_conn *conn;
3675 wait_queue_entry_t wait;
3676 unsigned long flags;
3682 init_waitqueue_entry(&wait, current);
3684 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3686 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3688 CWARN("Unable to bind on CPU partition %d, please verify "
3689 "whether all CPUs are healthy and reload modules if "
3690 "necessary, otherwise your system might under risk of "
3691 "low performance\n", sched->ibs_cpt);
3694 spin_lock_irqsave(&sched->ibs_lock, flags);
3696 while (!kiblnd_data.kib_shutdown) {
3697 if (busy_loops++ >= IBLND_RESCHED) {
3698 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3703 spin_lock_irqsave(&sched->ibs_lock, flags);
3708 if (!list_empty(&sched->ibs_conns)) {
3709 conn = list_entry(sched->ibs_conns.next,
3710 struct kib_conn, ibc_sched_list);
3711 /* take over kib_sched_conns' ref on conn... */
3712 LASSERT(conn->ibc_scheduled);
3713 list_del(&conn->ibc_sched_list);
3714 conn->ibc_ready = 0;
3716 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3718 wc.wr_id = IBLND_WID_INVAL;
3720 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3722 rc = ib_req_notify_cq(conn->ibc_cq,
3725 CWARN("%s: ib_req_notify_cq failed: %d, "
3726 "closing connection\n",
3727 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3728 kiblnd_close_conn(conn, -EIO);
3729 kiblnd_conn_decref(conn);
3730 spin_lock_irqsave(&sched->ibs_lock,
3735 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3738 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3740 "ib_poll_cq (rc: %d) returned invalid "
3741 "wr_id, opcode %d, status: %d, "
3742 "vendor_err: %d, conn: %s status: %d\n"
3743 "please upgrade firmware and OFED or "
3744 "contact vendor.\n", rc,
3745 wc.opcode, wc.status, wc.vendor_err,
3746 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3752 CWARN("%s: ib_poll_cq failed: %d, "
3753 "closing connection\n",
3754 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3756 kiblnd_close_conn(conn, -EIO);
3757 kiblnd_conn_decref(conn);
3758 spin_lock_irqsave(&sched->ibs_lock, flags);
3762 spin_lock_irqsave(&sched->ibs_lock, flags);
3764 if (rc != 0 || conn->ibc_ready) {
3765 /* There may be another completion waiting; get
3766 * another scheduler to check while I handle
3768 /* +1 ref for sched_conns */
3769 kiblnd_conn_addref(conn);
3770 list_add_tail(&conn->ibc_sched_list,
3772 if (waitqueue_active(&sched->ibs_waitq))
3773 wake_up(&sched->ibs_waitq);
3775 conn->ibc_scheduled = 0;
3779 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3780 kiblnd_complete(&wc);
3782 spin_lock_irqsave(&sched->ibs_lock, flags);
3785 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3792 set_current_state(TASK_INTERRUPTIBLE);
3793 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3794 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3799 remove_wait_queue(&sched->ibs_waitq, &wait);
3800 set_current_state(TASK_RUNNING);
3801 spin_lock_irqsave(&sched->ibs_lock, flags);
3804 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3806 kiblnd_thread_fini();
3811 kiblnd_failover_thread(void *arg)
3813 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3814 struct kib_dev *dev;
3815 struct net *ns = arg;
3816 wait_queue_entry_t wait;
3817 unsigned long flags;
3820 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3822 init_waitqueue_entry(&wait, current);
3823 write_lock_irqsave(glock, flags);
3825 while (!kiblnd_data.kib_shutdown) {
3826 int do_failover = 0;
3829 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3831 if (ktime_get_seconds() < dev->ibd_next_failover)
3838 list_del_init(&dev->ibd_fail_list);
3839 dev->ibd_failover = 1;
3840 write_unlock_irqrestore(glock, flags);
3842 rc = kiblnd_dev_failover(dev, ns);
3844 write_lock_irqsave(glock, flags);
3846 LASSERT (dev->ibd_failover);
3847 dev->ibd_failover = 0;
3848 if (rc >= 0) { /* Device is OK or failover succeed */
3849 dev->ibd_next_failover = ktime_get_seconds() + 3;
3853 /* failed to failover, retry later */
3854 dev->ibd_next_failover = ktime_get_seconds() +
3855 min(dev->ibd_failed_failover, 10);
3856 if (kiblnd_dev_can_failover(dev)) {
3857 list_add_tail(&dev->ibd_fail_list,
3858 &kiblnd_data.kib_failed_devs);
3864 /* long sleep if no more pending failover */
3865 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3867 set_current_state(TASK_INTERRUPTIBLE);
3868 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3869 write_unlock_irqrestore(glock, flags);
3871 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3872 cfs_time_seconds(1));
3873 set_current_state(TASK_RUNNING);
3874 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3875 write_lock_irqsave(glock, flags);
3877 if (!long_sleep || rc != 0)
3880 /* have a long sleep, routine check all active devices,
3881 * we need checking like this because if there is not active
3882 * connection on the dev and no SEND from local, we may listen
3883 * on wrong HCA for ever while there is a bonding failover */
3884 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3885 if (kiblnd_dev_can_failover(dev)) {
3886 list_add_tail(&dev->ibd_fail_list,
3887 &kiblnd_data.kib_failed_devs);
3892 write_unlock_irqrestore(glock, flags);
3894 kiblnd_thread_fini();