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);
878 /* I'm still holding ibc_lock! */
879 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
881 } else if (tx->tx_pool->tpo_pool.po_failed ||
882 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
883 /* close_conn will launch failover */
886 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
887 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
888 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
891 if (!frd->frd_valid) {
892 wr = &frd->frd_inv_wr.wr;
893 wr->next = &frd->frd_fastreg_wr.wr;
895 wr = &frd->frd_fastreg_wr.wr;
897 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
900 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
901 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
902 bad->wr_id, bad->opcode, bad->send_flags,
903 libcfs_nid2str(conn->ibc_peer->ibp_nid));
906 if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
909 #ifdef HAVE_IB_POST_SEND_RECV_CONST
910 rc = ib_post_send(conn->ibc_cmid->qp, wr,
911 (const struct ib_send_wr **)&bad);
913 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
917 conn->ibc_last_send = ktime_get();
922 /* NB credits are transferred in the actual
923 * message, which can only be the last work item */
924 conn->ibc_credits += credit;
925 conn->ibc_outstanding_credits += msg->ibm_credits;
926 conn->ibc_nsends_posted--;
927 if (msg->ibm_type == IBLND_MSG_NOOP)
928 conn->ibc_noops_posted--;
934 done = (tx->tx_sending == 0);
936 list_del(&tx->tx_list);
938 spin_unlock(&conn->ibc_lock);
940 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
941 CERROR("Error %d posting transmit to %s\n",
942 rc, libcfs_nid2str(peer_ni->ibp_nid));
944 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
945 rc, libcfs_nid2str(peer_ni->ibp_nid));
947 kiblnd_close_conn(conn, rc);
952 spin_lock(&conn->ibc_lock);
958 kiblnd_check_sends_locked(struct kib_conn *conn)
960 int ver = conn->ibc_version;
961 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
964 /* Don't send anything until after the connection is established */
965 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
966 CDEBUG(D_NET, "%s too soon\n",
967 libcfs_nid2str(conn->ibc_peer->ibp_nid));
971 LASSERT(conn->ibc_nsends_posted <=
972 kiblnd_concurrent_sends(ver, ni));
973 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
974 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
975 LASSERT (conn->ibc_reserved_credits >= 0);
977 while (conn->ibc_reserved_credits > 0 &&
978 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
979 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
980 struct kib_tx, tx_list);
981 list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
982 conn->ibc_reserved_credits--;
985 if (kiblnd_need_noop(conn)) {
986 spin_unlock(&conn->ibc_lock);
988 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
990 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
992 spin_lock(&conn->ibc_lock);
994 kiblnd_queue_tx_locked(tx, conn);
1000 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1002 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1003 struct kib_tx, tx_list);
1004 } else if (!list_empty(&conn->ibc_tx_noops)) {
1005 LASSERT (!IBLND_OOB_CAPABLE(ver));
1007 tx = list_entry(conn->ibc_tx_noops.next,
1008 struct kib_tx, tx_list);
1009 } else if (!list_empty(&conn->ibc_tx_queue)) {
1011 tx = list_entry(conn->ibc_tx_queue.next,
1012 struct kib_tx, tx_list);
1016 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1022 kiblnd_tx_complete(struct kib_tx *tx, int status)
1024 int failed = (status != IB_WC_SUCCESS);
1025 struct kib_conn *conn = tx->tx_conn;
1028 if (tx->tx_sending <= 0) {
1029 CERROR("Received an event on a freed tx: %p status %d\n",
1035 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1036 CNETERR("Tx -> %s cookie %#llx"
1037 " sending %d waiting %d: failed %d\n",
1038 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1039 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1042 kiblnd_close_conn(conn, -EIO);
1044 kiblnd_peer_alive(conn->ibc_peer);
1047 spin_lock(&conn->ibc_lock);
1049 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1050 * gets to free it, which also drops its ref on 'conn'. */
1053 conn->ibc_nsends_posted--;
1054 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1055 conn->ibc_noops_posted--;
1058 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
1059 tx->tx_waiting = 0; /* don't wait for peer_ni */
1060 tx->tx_status = -EIO;
1063 idle = (tx->tx_sending == 0) && /* This is the final callback */
1064 !tx->tx_waiting && /* Not waiting for peer_ni */
1065 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1067 list_del(&tx->tx_list);
1069 kiblnd_check_sends_locked(conn);
1070 spin_unlock(&conn->ibc_lock);
1077 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1080 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1081 struct ib_sge *sge = &tx->tx_msgsge;
1082 struct ib_rdma_wr *wrq;
1083 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1084 #ifdef HAVE_IB_GET_DMA_MR
1085 struct ib_mr *mr = hdev->ibh_mrs;
1088 LASSERT(tx->tx_nwrq >= 0);
1089 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1090 LASSERT(nob <= IBLND_MSG_SIZE);
1091 #ifdef HAVE_IB_GET_DMA_MR
1092 LASSERT(mr != NULL);
1095 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1097 #ifdef HAVE_IB_GET_DMA_MR
1098 sge->lkey = mr->lkey;
1100 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1102 sge->addr = tx->tx_msgaddr;
1105 wrq = &tx->tx_wrq[tx->tx_nwrq];
1106 memset(wrq, 0, sizeof(*wrq));
1108 wrq->wr.next = NULL;
1109 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1110 wrq->wr.sg_list = sge;
1111 wrq->wr.num_sge = 1;
1112 wrq->wr.opcode = IB_WR_SEND;
1113 wrq->wr.send_flags = IB_SEND_SIGNALED;
1119 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1120 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
1122 struct kib_msg *ibmsg = tx->tx_msg;
1123 struct kib_rdma_desc *srcrd = tx->tx_rd;
1124 struct ib_rdma_wr *wrq = NULL;
1132 LASSERT(!in_interrupt());
1133 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1134 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1136 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1137 resid > 0; resid -= sge_nob) {
1140 if (srcidx >= srcrd->rd_nfrags) {
1141 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1146 if (dstidx >= dstrd->rd_nfrags) {
1147 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1152 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1153 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1154 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1155 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1156 conn->ibc_max_frags,
1157 srcidx, srcrd->rd_nfrags,
1158 dstidx, dstrd->rd_nfrags);
1163 sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1164 kiblnd_rd_frag_size(dstrd, dstidx),
1167 sge = &tx->tx_sge[tx->tx_nsge];
1168 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1169 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1170 sge->length = sge_nob;
1173 wrq = &tx->tx_wrq[tx->tx_nwrq];
1175 wrq->wr.next = &(wrq + 1)->wr;
1176 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1177 wrq->wr.sg_list = sge;
1178 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1179 wrq->wr.send_flags = 0;
1181 #ifdef HAVE_IB_RDMA_WR
1182 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1184 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1187 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1189 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1194 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1195 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1198 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1200 wrq->wr.num_sge = wrq_sge;
1206 if (rc < 0) /* no RDMA if completing with failure */
1207 tx->tx_nwrq = tx->tx_nsge = 0;
1209 ibmsg->ibm_u.completion.ibcm_status = rc;
1210 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1211 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1212 type, sizeof(struct kib_completion_msg));
1218 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1220 struct list_head *q;
1223 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1224 LASSERT(!tx->tx_queued); /* not queued for sending already */
1225 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1227 if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
1228 tx->tx_status = -ECONNABORTED;
1230 if (tx->tx_conn != NULL) {
1231 /* PUT_DONE first attached to conn as a PUT_REQ */
1232 LASSERT(tx->tx_conn == conn);
1233 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1235 kiblnd_conn_decref(conn);
1237 list_add(&tx->tx_list, &conn->ibc_zombie_txs);
1242 timeout_ns = kiblnd_timeout() * NSEC_PER_SEC;
1244 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1246 if (tx->tx_conn == NULL) {
1247 kiblnd_conn_addref(conn);
1249 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1251 /* PUT_DONE first attached to conn as a PUT_REQ */
1252 LASSERT (tx->tx_conn == conn);
1253 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1256 switch (tx->tx_msg->ibm_type) {
1260 case IBLND_MSG_PUT_REQ:
1261 case IBLND_MSG_GET_REQ:
1262 q = &conn->ibc_tx_queue_rsrvd;
1265 case IBLND_MSG_PUT_NAK:
1266 case IBLND_MSG_PUT_ACK:
1267 case IBLND_MSG_PUT_DONE:
1268 case IBLND_MSG_GET_DONE:
1269 q = &conn->ibc_tx_queue_nocred;
1272 case IBLND_MSG_NOOP:
1273 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1274 q = &conn->ibc_tx_queue_nocred;
1276 q = &conn->ibc_tx_noops;
1279 case IBLND_MSG_IMMEDIATE:
1280 q = &conn->ibc_tx_queue;
1284 list_add_tail(&tx->tx_list, q);
1288 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1290 spin_lock(&conn->ibc_lock);
1291 kiblnd_queue_tx_locked(tx, conn);
1292 kiblnd_check_sends_locked(conn);
1293 spin_unlock(&conn->ibc_lock);
1296 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1297 struct sockaddr_in *srcaddr,
1298 struct sockaddr_in *dstaddr,
1301 unsigned short port;
1304 /* allow the port to be reused */
1305 rc = rdma_set_reuseaddr(cmid, 1);
1307 CERROR("Unable to set reuse on cmid: %d\n", rc);
1311 /* look for a free privileged port */
1312 for (port = PROT_SOCK-1; port > 0; port--) {
1313 srcaddr->sin_port = htons(port);
1314 rc = rdma_resolve_addr(cmid,
1315 (struct sockaddr *)srcaddr,
1316 (struct sockaddr *)dstaddr,
1319 CDEBUG(D_NET, "bound to port %hu\n", port);
1321 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1322 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1329 CERROR("Failed to bind to a free privileged port\n");
1334 kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
1336 struct rdma_cm_id *cmid;
1337 struct kib_dev *dev;
1338 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1339 struct sockaddr_in srcaddr;
1340 struct sockaddr_in dstaddr;
1343 LASSERT (net != NULL);
1344 LASSERT (peer_ni->ibp_connecting > 0);
1346 cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
1347 kiblnd_cm_callback, peer_ni,
1348 RDMA_PS_TCP, IB_QPT_RC);
1351 CERROR("Can't create CMID for %s: %ld\n",
1352 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1358 memset(&srcaddr, 0, sizeof(srcaddr));
1359 srcaddr.sin_family = AF_INET;
1360 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1362 memset(&dstaddr, 0, sizeof(dstaddr));
1363 dstaddr.sin_family = AF_INET;
1364 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1365 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1367 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1369 if (*kiblnd_tunables.kib_use_priv_port) {
1370 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1371 kiblnd_timeout() * 1000);
1373 rc = rdma_resolve_addr(cmid,
1374 (struct sockaddr *)&srcaddr,
1375 (struct sockaddr *)&dstaddr,
1376 kiblnd_timeout() * 1000);
1379 /* Can't initiate address resolution: */
1380 CERROR("Can't resolve addr for %s: %d\n",
1381 libcfs_nid2str(peer_ni->ibp_nid), rc);
1388 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1389 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1390 rdma_destroy_id(cmid);
1393 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1397 kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
1399 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1400 char *reason = NULL;
1402 unsigned long flags;
1404 write_lock_irqsave(glock, flags);
1405 if (peer_ni->ibp_reconnecting == 0) {
1406 if (peer_ni->ibp_accepting)
1407 reason = "accepting";
1408 else if (peer_ni->ibp_connecting)
1409 reason = "connecting";
1410 else if (!list_empty(&peer_ni->ibp_conns))
1411 reason = "connected";
1412 else /* connected then closed */
1418 if (peer_ni->ibp_accepting)
1419 CNETERR("Detecting race between accepting and reconnecting\n");
1420 peer_ni->ibp_reconnecting--;
1422 if (!kiblnd_peer_active(peer_ni)) {
1423 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1424 reason = "unlinked";
1428 peer_ni->ibp_connecting++;
1429 peer_ni->ibp_reconnected++;
1431 write_unlock_irqrestore(glock, flags);
1433 kiblnd_connect_peer(peer_ni);
1437 write_unlock_irqrestore(glock, flags);
1439 CWARN("Abort reconnection of %s: %s\n",
1440 libcfs_nid2str(peer_ni->ibp_nid), reason);
1441 kiblnd_txlist_done(&txs, -ECONNABORTED,
1442 LNET_MSG_STATUS_LOCAL_ABORTED);
1447 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1449 struct kib_peer_ni *peer_ni;
1450 struct kib_peer_ni *peer2;
1451 struct kib_conn *conn;
1452 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1453 unsigned long flags;
1456 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1458 /* If I get here, I've committed to send, so I complete the tx with
1459 * failure on any problems */
1461 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1462 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1464 /* First time, just use a read lock since I expect to find my peer_ni
1466 read_lock_irqsave(g_lock, flags);
1468 peer_ni = kiblnd_find_peer_locked(ni, nid);
1469 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1470 /* Found a peer_ni with an established connection */
1471 conn = kiblnd_get_conn_locked(peer_ni);
1472 kiblnd_conn_addref(conn); /* 1 ref for me... */
1474 read_unlock_irqrestore(g_lock, flags);
1477 kiblnd_queue_tx(tx, conn);
1478 kiblnd_conn_decref(conn); /* ...to here */
1482 read_unlock(g_lock);
1483 /* Re-try with a write lock */
1486 peer_ni = kiblnd_find_peer_locked(ni, nid);
1487 if (peer_ni != NULL) {
1488 if (list_empty(&peer_ni->ibp_conns)) {
1489 /* found a peer_ni, but it's still connecting... */
1490 LASSERT(kiblnd_peer_connecting(peer_ni));
1492 list_add_tail(&tx->tx_list,
1493 &peer_ni->ibp_tx_queue);
1494 write_unlock_irqrestore(g_lock, flags);
1496 conn = kiblnd_get_conn_locked(peer_ni);
1497 kiblnd_conn_addref(conn); /* 1 ref for me... */
1499 write_unlock_irqrestore(g_lock, flags);
1502 kiblnd_queue_tx(tx, conn);
1503 kiblnd_conn_decref(conn); /* ...to here */
1508 write_unlock_irqrestore(g_lock, flags);
1510 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1511 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1513 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1515 tx->tx_status = -EHOSTUNREACH;
1517 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1523 write_lock_irqsave(g_lock, flags);
1525 peer2 = kiblnd_find_peer_locked(ni, nid);
1526 if (peer2 != NULL) {
1527 if (list_empty(&peer2->ibp_conns)) {
1528 /* found a peer_ni, but it's still connecting... */
1529 LASSERT(kiblnd_peer_connecting(peer2));
1531 list_add_tail(&tx->tx_list,
1532 &peer2->ibp_tx_queue);
1533 write_unlock_irqrestore(g_lock, flags);
1535 conn = kiblnd_get_conn_locked(peer2);
1536 kiblnd_conn_addref(conn); /* 1 ref for me... */
1538 write_unlock_irqrestore(g_lock, flags);
1541 kiblnd_queue_tx(tx, conn);
1542 kiblnd_conn_decref(conn); /* ...to here */
1545 kiblnd_peer_decref(peer_ni);
1549 /* Brand new peer_ni */
1550 LASSERT(peer_ni->ibp_connecting == 0);
1551 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1552 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1554 /* always called with a ref on ni, which prevents ni being shutdown */
1555 LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);
1558 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1560 kiblnd_peer_addref(peer_ni);
1561 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1563 write_unlock_irqrestore(g_lock, flags);
1565 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1566 kiblnd_connect_peer(peer_ni);
1567 kiblnd_peer_decref(peer_ni);
1571 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1573 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1574 int type = lntmsg->msg_type;
1575 struct lnet_process_id target = lntmsg->msg_target;
1576 int target_is_router = lntmsg->msg_target_is_router;
1577 int routing = lntmsg->msg_routing;
1578 unsigned int payload_niov = lntmsg->msg_niov;
1579 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1580 unsigned int payload_offset = lntmsg->msg_offset;
1581 unsigned int payload_nob = lntmsg->msg_len;
1582 struct kib_msg *ibmsg;
1583 struct kib_rdma_desc *rd;
1588 /* NB 'private' is different depending on what we're sending.... */
1590 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1591 payload_nob, payload_niov, libcfs_id2str(target));
1593 LASSERT (payload_nob == 0 || payload_niov > 0);
1594 LASSERT (payload_niov <= LNET_MAX_IOV);
1596 /* Thread context */
1597 LASSERT (!in_interrupt());
1605 LASSERT (payload_nob == 0);
1609 if (routing || target_is_router)
1610 break; /* send IMMEDIATE */
1612 /* is the REPLY message too small for RDMA? */
1613 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1614 if (nob <= IBLND_MSG_SIZE)
1615 break; /* send IMMEDIATE */
1617 tx = kiblnd_get_idle_tx(ni, target.nid);
1619 CERROR("Can't allocate txd for GET to %s\n",
1620 libcfs_nid2str(target.nid));
1625 rd = &ibmsg->ibm_u.get.ibgm_rd;
1626 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1627 lntmsg->msg_md->md_niov,
1628 lntmsg->msg_md->md_kiov,
1629 0, lntmsg->msg_md->md_length);
1631 CERROR("Can't setup GET sink for %s: %d\n",
1632 libcfs_nid2str(target.nid), rc);
1633 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1638 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1639 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1640 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1642 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1644 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1645 if (tx->tx_lntmsg[1] == NULL) {
1646 CERROR("Can't create reply for GET -> %s\n",
1647 libcfs_nid2str(target.nid));
1652 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1653 tx->tx_waiting = 1; /* waiting for GET_DONE */
1654 kiblnd_launch_tx(ni, tx, target.nid);
1657 case LNET_MSG_REPLY:
1659 /* Is the payload small enough not to need RDMA? */
1660 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1661 if (nob <= IBLND_MSG_SIZE)
1662 break; /* send IMMEDIATE */
1664 tx = kiblnd_get_idle_tx(ni, target.nid);
1666 CERROR("Can't allocate %s txd for %s\n",
1667 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1668 libcfs_nid2str(target.nid));
1672 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1673 payload_niov, payload_kiov,
1674 payload_offset, payload_nob);
1676 CERROR("Can't setup PUT src for %s: %d\n",
1677 libcfs_nid2str(target.nid), rc);
1683 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1684 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1685 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
1686 sizeof(struct kib_putreq_msg));
1688 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1689 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1690 kiblnd_launch_tx(ni, tx, target.nid);
1694 /* send IMMEDIATE */
1695 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1698 tx = kiblnd_get_idle_tx(ni, target.nid);
1700 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1701 type, libcfs_nid2str(target.nid));
1706 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1708 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1709 offsetof(struct kib_msg,
1710 ibm_u.immediate.ibim_payload),
1711 payload_niov, payload_kiov,
1712 payload_offset, payload_nob);
1714 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1715 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1717 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1718 kiblnd_launch_tx(ni, tx, target.nid);
1723 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1725 struct lnet_process_id target = lntmsg->msg_target;
1726 unsigned int niov = lntmsg->msg_niov;
1727 struct bio_vec *kiov = lntmsg->msg_kiov;
1728 unsigned int offset = lntmsg->msg_offset;
1729 unsigned int nob = lntmsg->msg_len;
1733 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1735 CERROR("Can't get tx for REPLY to %s\n",
1736 libcfs_nid2str(target.nid));
1743 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1744 niov, kiov, offset, nob);
1747 CERROR("Can't setup GET src for %s: %d\n",
1748 libcfs_nid2str(target.nid), rc);
1752 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1753 IBLND_MSG_GET_DONE, nob,
1754 &rx->rx_msg->ibm_u.get.ibgm_rd,
1755 rx->rx_msg->ibm_u.get.ibgm_cookie);
1757 CERROR("Can't setup rdma for GET from %s: %d\n",
1758 libcfs_nid2str(target.nid), rc);
1763 /* No RDMA: local completion may happen now! */
1764 lnet_finalize(lntmsg, 0);
1766 /* RDMA: lnet_finalize(lntmsg) when it
1768 tx->tx_lntmsg[0] = lntmsg;
1771 kiblnd_queue_tx(tx, rx->rx_conn);
1776 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1779 lnet_finalize(lntmsg, -EIO);
1783 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1784 int delayed, unsigned int niov, struct bio_vec *kiov,
1785 unsigned int offset, unsigned int mlen, unsigned int rlen)
1787 struct kib_rx *rx = private;
1788 struct kib_msg *rxmsg = rx->rx_msg;
1789 struct kib_conn *conn = rx->rx_conn;
1793 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1796 LASSERT (mlen <= rlen);
1797 LASSERT (!in_interrupt());
1799 switch (rxmsg->ibm_type) {
1803 case IBLND_MSG_IMMEDIATE:
1804 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1805 if (nob > rx->rx_nob) {
1806 CERROR ("Immediate message from %s too big: %d(%d)\n",
1807 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1813 lnet_copy_flat2kiov(niov, kiov, offset,
1814 IBLND_MSG_SIZE, rxmsg,
1815 offsetof(struct kib_msg,
1816 ibm_u.immediate.ibim_payload),
1818 lnet_finalize(lntmsg, 0);
1821 case IBLND_MSG_PUT_REQ: {
1822 struct kib_msg *txmsg;
1823 struct kib_rdma_desc *rd;
1824 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1827 lnet_finalize(lntmsg, 0);
1828 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1833 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1835 CERROR("Can't allocate tx for %s\n",
1836 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1837 /* Not replying will break the connection */
1843 rd = &txmsg->ibm_u.putack.ibpam_rd;
1844 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1845 niov, kiov, offset, mlen);
1847 CERROR("Can't setup PUT sink for %s: %d\n",
1848 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1849 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1851 /* tell peer_ni it's over */
1852 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1857 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1858 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1859 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1861 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1863 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1864 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1865 kiblnd_queue_tx(tx, conn);
1867 /* reposted buffer reserved for PUT_DONE */
1868 post_credit = IBLND_POSTRX_NO_CREDIT;
1872 case IBLND_MSG_GET_REQ:
1873 if (lntmsg != NULL) {
1874 /* Optimized GET; RDMA lntmsg's payload */
1875 kiblnd_reply(ni, rx, lntmsg);
1877 /* GET didn't match anything */
1878 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1880 rxmsg->ibm_u.get.ibgm_cookie);
1885 kiblnd_post_rx(rx, post_credit);
1890 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1892 struct task_struct *task = kthread_run(fn, arg, name);
1895 return PTR_ERR(task);
1897 atomic_inc(&kiblnd_data.kib_nthreads);
1902 kiblnd_thread_fini (void)
1904 atomic_dec (&kiblnd_data.kib_nthreads);
1908 kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
1910 /* This is racy, but everyone's only writing ktime_get_seconds() */
1911 peer_ni->ibp_last_alive = ktime_get_seconds();
1916 kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
1919 time64_t last_alive = 0;
1920 unsigned long flags;
1922 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1924 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1925 error = peer_ni->ibp_error;
1926 peer_ni->ibp_error = 0;
1928 last_alive = peer_ni->ibp_last_alive;
1931 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1934 lnet_notify(peer_ni->ibp_ni,
1935 peer_ni->ibp_nid, false, false, last_alive);
1939 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
1941 /* This just does the immediate housekeeping. 'error' is zero for a
1942 * normal shutdown which can happen only after the connection has been
1943 * established. If the connection is established, schedule the
1944 * connection to be finished off by the connd. Otherwise the connd is
1945 * already dealing with it (either to set it up or tear it down).
1946 * Caller holds kib_global_lock exclusively in irq context */
1947 struct kib_peer_ni *peer_ni = conn->ibc_peer;
1948 struct kib_dev *dev;
1949 unsigned long flags;
1951 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1953 if (error != 0 && conn->ibc_comms_error == 0)
1954 conn->ibc_comms_error = error;
1956 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1957 return; /* already being handled */
1960 list_empty(&conn->ibc_tx_noops) &&
1961 list_empty(&conn->ibc_tx_queue) &&
1962 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1963 list_empty(&conn->ibc_tx_queue_nocred) &&
1964 list_empty(&conn->ibc_active_txs)) {
1965 CDEBUG(D_NET, "closing conn to %s\n",
1966 libcfs_nid2str(peer_ni->ibp_nid));
1968 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1969 libcfs_nid2str(peer_ni->ibp_nid), error,
1970 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1971 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1972 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1973 "" : "(sending_rsrvd)",
1974 list_empty(&conn->ibc_tx_queue_nocred) ?
1975 "" : "(sending_nocred)",
1976 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1979 dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
1980 if (peer_ni->ibp_next_conn == conn)
1981 /* clear next_conn so it won't be used */
1982 peer_ni->ibp_next_conn = NULL;
1983 list_del(&conn->ibc_list);
1984 /* connd (see below) takes over ibc_list's ref */
1986 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
1987 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
1988 kiblnd_unlink_peer_locked(peer_ni);
1990 /* set/clear error on last conn */
1991 peer_ni->ibp_error = conn->ibc_comms_error;
1994 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1997 kiblnd_dev_can_failover(dev)) {
1998 list_add_tail(&dev->ibd_fail_list,
1999 &kiblnd_data.kib_failed_devs);
2000 wake_up(&kiblnd_data.kib_failover_waitq);
2003 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2005 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2006 wake_up(&kiblnd_data.kib_connd_waitq);
2008 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2012 kiblnd_close_conn(struct kib_conn *conn, int error)
2014 unsigned long flags;
2016 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2018 kiblnd_close_conn_locked(conn, error);
2020 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2024 kiblnd_handle_early_rxs(struct kib_conn *conn)
2026 unsigned long flags;
2029 LASSERT(!in_interrupt());
2030 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2032 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2033 while (!list_empty(&conn->ibc_early_rxs)) {
2034 rx = list_entry(conn->ibc_early_rxs.next,
2035 struct kib_rx, rx_list);
2036 list_del(&rx->rx_list);
2037 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2039 kiblnd_handle_rx(rx);
2041 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2043 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2047 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
2053 spin_lock(&conn->ibc_lock);
2055 list_for_each_entry_safe(tx, nxt, txs, tx_list) {
2056 if (txs == &conn->ibc_active_txs) {
2057 LASSERT(!tx->tx_queued);
2058 LASSERT(tx->tx_waiting ||
2059 tx->tx_sending != 0);
2060 if (conn->ibc_comms_error == -ETIMEDOUT) {
2061 if (tx->tx_waiting && !tx->tx_sending)
2063 LNET_MSG_STATUS_REMOTE_TIMEOUT;
2064 else if (tx->tx_sending)
2066 LNET_MSG_STATUS_NETWORK_TIMEOUT;
2069 LASSERT(tx->tx_queued);
2070 if (conn->ibc_comms_error == -ETIMEDOUT)
2071 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2073 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
2076 tx->tx_status = -ECONNABORTED;
2080 * TODO: This makes an assumption that
2081 * kiblnd_tx_complete() will be called for each tx. If
2082 * that event is dropped we could end up with stale
2083 * connections floating around. We'd like to deal with
2084 * that in a better way.
2086 * Also that means we can exceed the timeout by many
2089 if (tx->tx_sending == 0) {
2091 list_move(&tx->tx_list, &zombies);
2095 spin_unlock(&conn->ibc_lock);
2098 * aborting transmits occurs when finalizing the connection.
2099 * The connection is finalized on error.
2100 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
2101 * override the value already set in tx->tx_hstatus above.
2103 kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
2107 kiblnd_finalise_conn(struct kib_conn *conn)
2109 LASSERT (!in_interrupt());
2110 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2112 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2113 * for connections that didn't get as far as being connected, because
2114 * rdma_disconnect() does this for free. */
2115 kiblnd_abort_receives(conn);
2117 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2119 /* Complete all tx descs not waiting for sends to complete.
2120 * NB we should be safe from RDMA now that the QP has changed state */
2122 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2123 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2124 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2125 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2126 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2128 kiblnd_handle_early_rxs(conn);
2132 kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
2136 unsigned long flags;
2138 LASSERT (error != 0);
2139 LASSERT (!in_interrupt());
2141 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2144 LASSERT(peer_ni->ibp_connecting > 0);
2145 peer_ni->ibp_connecting--;
2147 LASSERT (peer_ni->ibp_accepting > 0);
2148 peer_ni->ibp_accepting--;
2151 if (kiblnd_peer_connecting(peer_ni)) {
2152 /* another connection attempt under way... */
2153 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2158 peer_ni->ibp_reconnected = 0;
2159 if (list_empty(&peer_ni->ibp_conns)) {
2160 /* Take peer_ni's blocked transmits to complete with error */
2161 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2163 if (kiblnd_peer_active(peer_ni))
2164 kiblnd_unlink_peer_locked(peer_ni);
2166 peer_ni->ibp_error = error;
2168 /* Can't have blocked transmits if there are connections */
2169 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2172 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2174 kiblnd_peer_notify(peer_ni);
2176 if (list_empty(&zombies))
2179 CNETERR("Deleting messages for %s: connection failed\n",
2180 libcfs_nid2str(peer_ni->ibp_nid));
2182 kiblnd_txlist_done(&zombies, error,
2183 LNET_MSG_STATUS_LOCAL_DROPPED);
2187 kiblnd_connreq_done(struct kib_conn *conn, int status)
2189 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2192 unsigned long flags;
2195 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2197 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2198 libcfs_nid2str(peer_ni->ibp_nid), active,
2199 conn->ibc_version, status);
2201 LASSERT (!in_interrupt());
2202 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2203 peer_ni->ibp_connecting > 0) ||
2204 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2205 peer_ni->ibp_accepting > 0));
2207 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2208 conn->ibc_connvars = NULL;
2211 /* failed to establish connection */
2212 kiblnd_peer_connect_failed(peer_ni, active, status);
2213 kiblnd_finalise_conn(conn);
2217 /* connection established */
2218 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2220 conn->ibc_last_send = ktime_get();
2221 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2222 kiblnd_peer_alive(peer_ni);
2224 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2225 * peer_ni instance... */
2226 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2227 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2228 peer_ni->ibp_reconnected = 0;
2230 peer_ni->ibp_connecting--;
2232 peer_ni->ibp_accepting--;
2234 if (peer_ni->ibp_version == 0) {
2235 peer_ni->ibp_version = conn->ibc_version;
2236 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2239 if (peer_ni->ibp_version != conn->ibc_version ||
2240 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2241 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2242 conn->ibc_incarnation);
2243 peer_ni->ibp_version = conn->ibc_version;
2244 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2247 /* grab pending txs while I have the lock */
2248 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2250 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2251 conn->ibc_comms_error != 0) { /* error has happened already */
2253 /* start to shut down connection */
2254 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2255 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2257 kiblnd_txlist_done(&txs, -ECONNABORTED,
2258 LNET_MSG_STATUS_LOCAL_ERROR);
2263 /* +1 ref for myself, this connection is visible to other threads
2264 * now, refcount of peer:ibp_conns can be released by connection
2265 * close from either a different thread, or the calling of
2266 * kiblnd_check_sends_locked() below. See bz21911 for details.
2268 kiblnd_conn_addref(conn);
2269 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2271 /* Schedule blocked txs
2272 * Note: if we are running with conns_per_peer > 1, these blocked
2273 * txs will all get scheduled to the first connection which gets
2274 * scheduled. We won't be using round robin on this first batch.
2276 spin_lock(&conn->ibc_lock);
2277 while (!list_empty(&txs)) {
2278 tx = list_entry(txs.next, struct kib_tx, tx_list);
2279 list_del(&tx->tx_list);
2281 kiblnd_queue_tx_locked(tx, conn);
2283 kiblnd_check_sends_locked(conn);
2284 spin_unlock(&conn->ibc_lock);
2286 /* schedule blocked rxs */
2287 kiblnd_handle_early_rxs(conn);
2288 kiblnd_conn_decref(conn);
2292 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2296 rc = rdma_reject(cmid, rej, sizeof(*rej));
2299 CWARN("Error %d sending reject\n", rc);
2303 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2305 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2306 struct kib_msg *reqmsg = priv;
2307 struct kib_msg *ackmsg;
2308 struct kib_dev *ibdev;
2309 struct kib_peer_ni *peer_ni;
2310 struct kib_peer_ni *peer2;
2311 struct kib_conn *conn;
2312 struct lnet_ni *ni = NULL;
2313 struct kib_net *net = NULL;
2315 struct rdma_conn_param cp;
2317 int version = IBLND_MSG_VERSION;
2318 unsigned long flags;
2320 struct sockaddr_in *peer_addr;
2321 LASSERT (!in_interrupt());
2323 /* cmid inherits 'context' from the corresponding listener id */
2324 ibdev = cmid->context;
2327 memset(&rej, 0, sizeof(rej));
2328 rej.ibr_magic = IBLND_MSG_MAGIC;
2329 rej.ibr_why = IBLND_REJECT_FATAL;
2330 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2332 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2333 if (*kiblnd_tunables.kib_require_priv_port &&
2334 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2335 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2336 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2337 &ip, ntohs(peer_addr->sin_port));
2341 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2342 CERROR("Short connection request\n");
2346 /* Future protocol version compatibility support! If the
2347 * o2iblnd-specific protocol changes, or when LNET unifies
2348 * protocols over all LNDs, the initial connection will
2349 * negotiate a protocol version. I trap this here to avoid
2350 * console errors; the reject tells the peer_ni which protocol I
2352 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2353 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2355 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2356 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2357 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2359 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2360 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2361 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2364 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2366 CERROR("Can't parse connection request: %d\n", rc);
2370 nid = reqmsg->ibm_srcnid;
2371 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2374 net = (struct kib_net *)ni->ni_data;
2375 rej.ibr_incarnation = net->ibn_incarnation;
2378 if (ni == NULL || /* no matching net */
2379 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2380 net->ibn_dev != ibdev) { /* wrong device */
2381 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2382 "bad dst nid %s\n", libcfs_nid2str(nid),
2383 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2384 ibdev->ibd_ifname, ibdev->ibd_nnets,
2386 libcfs_nid2str(reqmsg->ibm_dstnid));
2391 /* check time stamp as soon as possible */
2392 if (reqmsg->ibm_dststamp != 0 &&
2393 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2394 CWARN("Stale connection request\n");
2395 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2399 /* I can accept peer_ni's version */
2400 version = reqmsg->ibm_version;
2402 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2403 CERROR("Unexpected connreq msg type: %x from %s\n",
2404 reqmsg->ibm_type, libcfs_nid2str(nid));
2408 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2409 kiblnd_msg_queue_size(version, ni)) {
2410 CERROR("Can't accept conn from %s, queue depth too large: "
2411 " %d (<=%d wanted)\n",
2412 libcfs_nid2str(nid),
2413 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2414 kiblnd_msg_queue_size(version, ni));
2416 if (version == IBLND_MSG_VERSION)
2417 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2422 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2423 IBLND_MAX_RDMA_FRAGS) {
2424 CWARN("Can't accept conn from %s (version %x): "
2425 "max_frags %d too large (%d wanted)\n",
2426 libcfs_nid2str(nid), version,
2427 reqmsg->ibm_u.connparams.ibcp_max_frags,
2428 IBLND_MAX_RDMA_FRAGS);
2430 if (version >= IBLND_MSG_VERSION)
2431 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2434 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2435 IBLND_MAX_RDMA_FRAGS &&
2436 net->ibn_fmr_ps == NULL) {
2437 CWARN("Can't accept conn from %s (version %x): "
2438 "max_frags %d incompatible without FMR pool "
2440 libcfs_nid2str(nid), version,
2441 reqmsg->ibm_u.connparams.ibcp_max_frags,
2442 IBLND_MAX_RDMA_FRAGS);
2444 if (version == IBLND_MSG_VERSION)
2445 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2450 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2451 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2452 libcfs_nid2str(nid),
2453 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2458 /* assume 'nid' is a new peer_ni; create */
2459 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2461 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2462 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2466 /* We have validated the peer's parameters so use those */
2467 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2468 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2470 write_lock_irqsave(g_lock, flags);
2472 peer2 = kiblnd_find_peer_locked(ni, nid);
2473 if (peer2 != NULL) {
2474 if (peer2->ibp_version == 0) {
2475 peer2->ibp_version = version;
2476 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2479 /* not the guy I've talked with */
2480 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2481 peer2->ibp_version != version) {
2482 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2484 if (kiblnd_peer_active(peer2)) {
2485 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2486 peer2->ibp_version = version;
2488 write_unlock_irqrestore(g_lock, flags);
2490 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2491 libcfs_nid2str(nid), peer2->ibp_version, version,
2492 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2494 kiblnd_peer_decref(peer_ni);
2495 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2499 /* Tie-break connection race in favour of the higher NID.
2500 * If we keep running into a race condition multiple times,
2501 * we have to assume that the connection attempt with the
2502 * higher NID is stuck in a connecting state and will never
2503 * recover. As such, we pass through this if-block and let
2504 * the lower NID connection win so we can move forward.
2506 if (peer2->ibp_connecting != 0 &&
2507 nid < ni->ni_nid && peer2->ibp_races <
2508 MAX_CONN_RACES_BEFORE_ABORT) {
2510 write_unlock_irqrestore(g_lock, flags);
2512 CDEBUG(D_NET, "Conn race %s\n",
2513 libcfs_nid2str(peer2->ibp_nid));
2515 kiblnd_peer_decref(peer_ni);
2516 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2519 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2520 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2521 libcfs_nid2str(peer2->ibp_nid),
2522 MAX_CONN_RACES_BEFORE_ABORT);
2524 * passive connection is allowed even this peer_ni is waiting for
2527 peer2->ibp_reconnecting = 0;
2528 peer2->ibp_races = 0;
2529 peer2->ibp_accepting++;
2530 kiblnd_peer_addref(peer2);
2532 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2533 * so copy validated parameters since we now know what the
2534 * peer_ni's limits are */
2535 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2536 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2538 write_unlock_irqrestore(g_lock, flags);
2539 kiblnd_peer_decref(peer_ni);
2542 /* Brand new peer_ni */
2543 LASSERT (peer_ni->ibp_accepting == 0);
2544 LASSERT (peer_ni->ibp_version == 0 &&
2545 peer_ni->ibp_incarnation == 0);
2547 peer_ni->ibp_accepting = 1;
2548 peer_ni->ibp_version = version;
2549 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2551 /* I have a ref on ni that prevents it being shutdown */
2552 LASSERT (net->ibn_shutdown == 0);
2554 kiblnd_peer_addref(peer_ni);
2555 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2557 write_unlock_irqrestore(g_lock, flags);
2560 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2562 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2563 kiblnd_peer_decref(peer_ni);
2564 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2568 /* conn now "owns" cmid, so I return success from here on to ensure the
2569 * CM callback doesn't destroy cmid. */
2570 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2571 conn->ibc_credits = conn->ibc_queue_depth;
2572 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2573 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2574 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2576 ackmsg = &conn->ibc_connvars->cv_msg;
2577 memset(ackmsg, 0, sizeof(*ackmsg));
2579 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2580 sizeof(ackmsg->ibm_u.connparams));
2581 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2582 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2583 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2585 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2587 memset(&cp, 0, sizeof(cp));
2588 cp.private_data = ackmsg;
2589 cp.private_data_len = ackmsg->ibm_nob;
2590 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2591 cp.initiator_depth = 0;
2592 cp.flow_control = 1;
2593 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2594 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2596 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2598 rc = rdma_accept(cmid, &cp);
2600 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2601 rej.ibr_version = version;
2602 rej.ibr_why = IBLND_REJECT_FATAL;
2604 kiblnd_reject(cmid, &rej);
2605 kiblnd_connreq_done(conn, rc);
2606 kiblnd_conn_decref(conn);
2614 rej.ibr_cp.ibcp_queue_depth =
2615 kiblnd_msg_queue_size(version, ni);
2616 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2620 rej.ibr_version = version;
2621 kiblnd_reject(cmid, &rej);
2623 return -ECONNREFUSED;
2627 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2628 u64 incarnation, int why, struct kib_connparams *cp)
2630 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2631 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2633 int msg_size = IBLND_MSG_SIZE;
2637 unsigned long flags;
2639 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2640 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2643 msg_size = cp->ibcp_max_msg_size;
2644 frag_num = cp->ibcp_max_frags;
2645 queue_dep = cp->ibcp_queue_depth;
2648 write_lock_irqsave(glock, flags);
2649 /* retry connection if it's still needed and no other connection
2650 * attempts (active or passive) are in progress
2651 * NB: reconnect is still needed even when ibp_tx_queue is
2652 * empty if ibp_version != version because reconnect may be
2655 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2656 peer_ni->ibp_version != version) &&
2657 peer_ni->ibp_connecting &&
2658 peer_ni->ibp_accepting == 0;
2669 case IBLND_REJECT_RDMA_FRAGS: {
2670 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2673 reason = "can't negotiate max frags";
2676 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2677 #ifdef HAVE_IB_GET_DMA_MR
2679 * This check only makes sense if the kernel supports global
2680 * memory registration. Otherwise, map_on_demand will never == 0
2682 if (!tunables->lnd_map_on_demand) {
2683 reason = "map_on_demand must be enabled";
2687 if (conn->ibc_max_frags <= frag_num) {
2688 reason = "unsupported max frags";
2692 peer_ni->ibp_max_frags = frag_num;
2693 reason = "rdma fragments";
2696 case IBLND_REJECT_MSG_QUEUE_SIZE:
2698 reason = "can't negotiate queue depth";
2701 if (conn->ibc_queue_depth <= queue_dep) {
2702 reason = "unsupported queue depth";
2706 peer_ni->ibp_queue_depth = queue_dep;
2707 reason = "queue depth";
2710 case IBLND_REJECT_CONN_STALE:
2714 case IBLND_REJECT_CONN_RACE:
2715 reason = "conn race";
2718 case IBLND_REJECT_CONN_UNCOMPAT:
2719 reason = "version negotiation";
2722 case IBLND_REJECT_INVALID_SRV_ID:
2723 reason = "invalid service id";
2727 conn->ibc_reconnect = 1;
2728 peer_ni->ibp_reconnecting++;
2729 peer_ni->ibp_version = version;
2730 if (incarnation != 0)
2731 peer_ni->ibp_incarnation = incarnation;
2733 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2735 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2736 libcfs_nid2str(peer_ni->ibp_nid),
2737 reconnect ? "reconnect" : "don't reconnect",
2738 reason, IBLND_MSG_VERSION, version, msg_size,
2739 conn->ibc_queue_depth, queue_dep,
2740 conn->ibc_max_frags, frag_num);
2742 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2743 * while destroying the zombie
2748 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2750 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2752 LASSERT (!in_interrupt());
2753 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2756 case IB_CM_REJ_STALE_CONN:
2757 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2758 IBLND_REJECT_CONN_STALE, NULL);
2761 case IB_CM_REJ_INVALID_SERVICE_ID:
2762 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2763 IBLND_REJECT_INVALID_SRV_ID, NULL);
2764 CNETERR("%s rejected: no listener at %d\n",
2765 libcfs_nid2str(peer_ni->ibp_nid),
2766 *kiblnd_tunables.kib_service);
2769 case IB_CM_REJ_CONSUMER_DEFINED:
2770 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2771 struct kib_rej *rej = priv;
2772 struct kib_connparams *cp = NULL;
2774 __u64 incarnation = -1;
2776 /* NB. default incarnation is -1 because:
2777 * a) V1 will ignore dst incarnation in connreq.
2778 * b) V2 will provide incarnation while rejecting me,
2779 * -1 will be overwrote.
2781 * if I try to connect to a V1 peer_ni with V2 protocol,
2782 * it rejected me then upgrade to V2, I have no idea
2783 * about the upgrading and try to reconnect with V1,
2784 * in this case upgraded V2 can find out I'm trying to
2785 * talk to the old guy and reject me(incarnation is -1).
2788 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2789 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2790 __swab32s(&rej->ibr_magic);
2791 __swab16s(&rej->ibr_version);
2795 if (priv_nob >= sizeof(struct kib_rej) &&
2796 rej->ibr_version > IBLND_MSG_VERSION_1) {
2797 /* priv_nob is always 148 in current version
2798 * of OFED, so we still need to check version.
2799 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2803 __swab64s(&rej->ibr_incarnation);
2804 __swab16s(&cp->ibcp_queue_depth);
2805 __swab16s(&cp->ibcp_max_frags);
2806 __swab32s(&cp->ibcp_max_msg_size);
2809 incarnation = rej->ibr_incarnation;
2812 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2813 rej->ibr_magic != LNET_PROTO_MAGIC) {
2814 CERROR("%s rejected: consumer defined fatal error\n",
2815 libcfs_nid2str(peer_ni->ibp_nid));
2819 if (rej->ibr_version != IBLND_MSG_VERSION &&
2820 rej->ibr_version != IBLND_MSG_VERSION_1) {
2821 CERROR("%s rejected: o2iblnd version %x error\n",
2822 libcfs_nid2str(peer_ni->ibp_nid),
2827 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2828 rej->ibr_version == IBLND_MSG_VERSION_1) {
2829 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2830 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2832 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2833 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2836 switch (rej->ibr_why) {
2837 case IBLND_REJECT_CONN_RACE:
2838 case IBLND_REJECT_CONN_STALE:
2839 case IBLND_REJECT_CONN_UNCOMPAT:
2840 case IBLND_REJECT_MSG_QUEUE_SIZE:
2841 case IBLND_REJECT_RDMA_FRAGS:
2842 kiblnd_check_reconnect(conn, rej->ibr_version,
2843 incarnation, rej->ibr_why, cp);
2846 case IBLND_REJECT_NO_RESOURCES:
2847 CERROR("%s rejected: o2iblnd no resources\n",
2848 libcfs_nid2str(peer_ni->ibp_nid));
2851 case IBLND_REJECT_FATAL:
2852 CERROR("%s rejected: o2iblnd fatal error\n",
2853 libcfs_nid2str(peer_ni->ibp_nid));
2857 CERROR("%s rejected: o2iblnd reason %d\n",
2858 libcfs_nid2str(peer_ni->ibp_nid),
2866 CNETERR("%s rejected: reason %d, size %d\n",
2867 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2871 kiblnd_connreq_done(conn, -ECONNREFUSED);
2875 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2877 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2878 struct lnet_ni *ni = peer_ni->ibp_ni;
2879 struct kib_net *net = ni->ni_data;
2880 struct kib_msg *msg = priv;
2881 int ver = conn->ibc_version;
2882 int rc = kiblnd_unpack_msg(msg, priv_nob);
2883 unsigned long flags;
2885 LASSERT (net != NULL);
2888 CERROR("Can't unpack connack from %s: %d\n",
2889 libcfs_nid2str(peer_ni->ibp_nid), rc);
2893 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2894 CERROR("Unexpected message %d from %s\n",
2895 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2900 if (ver != msg->ibm_version) {
2901 CERROR("%s replied version %x is different with "
2902 "requested version %x\n",
2903 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2908 if (msg->ibm_u.connparams.ibcp_queue_depth >
2909 conn->ibc_queue_depth) {
2910 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2911 libcfs_nid2str(peer_ni->ibp_nid),
2912 msg->ibm_u.connparams.ibcp_queue_depth,
2913 conn->ibc_queue_depth);
2918 if (msg->ibm_u.connparams.ibcp_max_frags >
2919 conn->ibc_max_frags) {
2920 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2921 libcfs_nid2str(peer_ni->ibp_nid),
2922 msg->ibm_u.connparams.ibcp_max_frags,
2923 conn->ibc_max_frags);
2928 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2929 CERROR("%s max message size %d too big (%d max)\n",
2930 libcfs_nid2str(peer_ni->ibp_nid),
2931 msg->ibm_u.connparams.ibcp_max_msg_size,
2937 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2938 if (msg->ibm_dstnid == ni->ni_nid &&
2939 msg->ibm_dststamp == net->ibn_incarnation)
2943 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2946 CERROR("Bad connection reply from %s, rc = %d, "
2947 "version: %x max_frags: %d\n",
2948 libcfs_nid2str(peer_ni->ibp_nid), rc,
2949 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2953 conn->ibc_incarnation = msg->ibm_srcstamp;
2954 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2955 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2956 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2957 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2958 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2959 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2961 kiblnd_connreq_done(conn, 0);
2965 /* NB My QP has already established itself, so I handle anything going
2966 * wrong here by setting ibc_comms_error.
2967 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2968 * immediately tears it down. */
2971 conn->ibc_comms_error = rc;
2972 kiblnd_connreq_done(conn, 0);
2976 kiblnd_active_connect(struct rdma_cm_id *cmid)
2978 struct kib_peer_ni *peer_ni = cmid->context;
2979 struct kib_conn *conn;
2980 struct kib_msg *msg;
2981 struct rdma_conn_param cp;
2984 unsigned long flags;
2987 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2989 incarnation = peer_ni->ibp_incarnation;
2990 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
2991 peer_ni->ibp_version;
2993 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2995 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
2998 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
2999 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3003 /* conn "owns" cmid now, so I return success from here on to ensure the
3004 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3007 msg = &conn->ibc_connvars->cv_msg;
3009 memset(msg, 0, sizeof(*msg));
3010 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3011 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3012 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3013 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3015 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3016 0, peer_ni->ibp_nid, incarnation);
3018 memset(&cp, 0, sizeof(cp));
3019 cp.private_data = msg;
3020 cp.private_data_len = msg->ibm_nob;
3021 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3022 cp.initiator_depth = 0;
3023 cp.flow_control = 1;
3024 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3025 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3027 LASSERT(cmid->context == (void *)conn);
3028 LASSERT(conn->ibc_cmid == cmid);
3030 rc = rdma_connect(cmid, &cp);
3032 CERROR("Can't connect to %s: %d\n",
3033 libcfs_nid2str(peer_ni->ibp_nid), rc);
3034 kiblnd_connreq_done(conn, rc);
3035 kiblnd_conn_decref(conn);
3042 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3044 struct kib_peer_ni *peer_ni;
3045 struct kib_conn *conn;
3048 switch (event->event) {
3050 CERROR("Unexpected event: %d, status: %d\n",
3051 event->event, event->status);
3054 case RDMA_CM_EVENT_CONNECT_REQUEST:
3055 /* destroy cmid on failure */
3056 rc = kiblnd_passive_connect(cmid,
3057 (void *)KIBLND_CONN_PARAM(event),
3058 KIBLND_CONN_PARAM_LEN(event));
3059 CDEBUG(D_NET, "connreq: %d\n", rc);
3062 case RDMA_CM_EVENT_ADDR_ERROR:
3063 peer_ni = cmid->context;
3064 CNETERR("%s: ADDR ERROR %d\n",
3065 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3066 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3067 kiblnd_peer_decref(peer_ni);
3068 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3070 case RDMA_CM_EVENT_ADDR_RESOLVED:
3071 peer_ni = cmid->context;
3073 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3074 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3076 if (event->status != 0) {
3077 CNETERR("Can't resolve address for %s: %d\n",
3078 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3081 rc = rdma_resolve_route(
3082 cmid, kiblnd_timeout() * 1000);
3084 struct kib_net *net = peer_ni->ibp_ni->ni_data;
3085 struct kib_dev *dev = net->ibn_dev;
3087 CDEBUG(D_NET, "%s: connection bound to "\
3089 libcfs_nid2str(peer_ni->ibp_nid),
3091 &dev->ibd_ifip, cmid->device->name);
3096 /* Can't initiate route resolution */
3097 CERROR("Can't resolve route for %s: %d\n",
3098 libcfs_nid2str(peer_ni->ibp_nid), rc);
3100 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3101 kiblnd_peer_decref(peer_ni);
3102 return rc; /* rc != 0 destroys cmid */
3104 case RDMA_CM_EVENT_ROUTE_ERROR:
3105 peer_ni = cmid->context;
3106 CNETERR("%s: ROUTE ERROR %d\n",
3107 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3108 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3109 kiblnd_peer_decref(peer_ni);
3110 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3112 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3113 peer_ni = cmid->context;
3114 CDEBUG(D_NET,"%s Route resolved: %d\n",
3115 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3117 if (event->status == 0)
3118 return kiblnd_active_connect(cmid);
3120 CNETERR("Can't resolve route for %s: %d\n",
3121 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3122 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3123 kiblnd_peer_decref(peer_ni);
3124 return event->status; /* rc != 0 destroys cmid */
3126 case RDMA_CM_EVENT_UNREACHABLE:
3127 conn = cmid->context;
3128 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3129 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3130 CNETERR("%s: UNREACHABLE %d\n",
3131 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3132 kiblnd_connreq_done(conn, -ENETDOWN);
3133 kiblnd_conn_decref(conn);
3136 case RDMA_CM_EVENT_CONNECT_ERROR:
3137 conn = cmid->context;
3138 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3139 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3140 CNETERR("%s: CONNECT ERROR %d\n",
3141 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3142 kiblnd_connreq_done(conn, -ENOTCONN);
3143 kiblnd_conn_decref(conn);
3146 case RDMA_CM_EVENT_REJECTED:
3147 conn = cmid->context;
3148 switch (conn->ibc_state) {
3152 case IBLND_CONN_PASSIVE_WAIT:
3153 CERROR ("%s: REJECTED %d\n",
3154 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3156 kiblnd_connreq_done(conn, -ECONNRESET);
3159 case IBLND_CONN_ACTIVE_CONNECT:
3160 kiblnd_rejected(conn, event->status,
3161 (void *)KIBLND_CONN_PARAM(event),
3162 KIBLND_CONN_PARAM_LEN(event));
3165 kiblnd_conn_decref(conn);
3168 case RDMA_CM_EVENT_ESTABLISHED:
3169 conn = cmid->context;
3170 switch (conn->ibc_state) {
3174 case IBLND_CONN_PASSIVE_WAIT:
3175 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3176 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3177 kiblnd_connreq_done(conn, 0);
3180 case IBLND_CONN_ACTIVE_CONNECT:
3181 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3182 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3183 kiblnd_check_connreply(conn,
3184 (void *)KIBLND_CONN_PARAM(event),
3185 KIBLND_CONN_PARAM_LEN(event));
3188 /* net keeps its ref on conn! */
3191 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3192 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3195 case RDMA_CM_EVENT_DISCONNECTED:
3196 conn = cmid->context;
3197 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3198 CERROR("%s DISCONNECTED\n",
3199 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3200 kiblnd_connreq_done(conn, -ECONNRESET);
3202 kiblnd_close_conn(conn, 0);
3204 kiblnd_conn_decref(conn);
3205 cmid->context = NULL;
3208 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3209 LCONSOLE_ERROR_MSG(0x131,
3210 "Received notification of device removal\n"
3211 "Please shutdown LNET to allow this to proceed\n");
3212 /* Can't remove network from underneath LNET for now, so I have
3216 case RDMA_CM_EVENT_ADDR_CHANGE:
3217 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3223 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3226 struct list_head *ttmp;
3228 list_for_each(ttmp, txs) {
3229 tx = list_entry(ttmp, struct kib_tx, tx_list);
3231 if (txs != &conn->ibc_active_txs) {
3232 LASSERT(tx->tx_queued);
3234 LASSERT(!tx->tx_queued);
3235 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3238 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3239 CERROR("Timed out tx: %s, %lld seconds\n",
3240 kiblnd_queue2str(conn, txs),
3241 ktime_ms_delta(ktime_get(),
3242 tx->tx_deadline) / MSEC_PER_SEC);
3251 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3253 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3254 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3255 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3256 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3257 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3261 kiblnd_check_conns (int idx)
3264 LIST_HEAD(checksends);
3265 LIST_HEAD(timedout_txs);
3266 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3267 struct list_head *ptmp;
3268 struct kib_peer_ni *peer_ni;
3269 struct kib_conn *conn;
3270 struct kib_tx *tx, *tx_tmp;
3271 struct list_head *ctmp;
3272 unsigned long flags;
3274 /* NB. We expect to have a look at all the peers and not find any
3275 * RDMAs to time out, so we just use a shared lock while we
3277 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3279 list_for_each(ptmp, peers) {
3280 peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
3282 /* Check tx_deadline */
3283 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3284 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3285 CWARN("Timed out tx for %s: %lld seconds\n",
3286 libcfs_nid2str(peer_ni->ibp_nid),
3287 ktime_ms_delta(ktime_get(),
3288 tx->tx_deadline) / MSEC_PER_SEC);
3289 list_move(&tx->tx_list, &timedout_txs);
3293 list_for_each(ctmp, &peer_ni->ibp_conns) {
3297 conn = list_entry(ctmp, struct kib_conn, ibc_list);
3299 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3301 spin_lock(&conn->ibc_lock);
3303 sendnoop = kiblnd_need_noop(conn);
3304 timedout = kiblnd_conn_timed_out_locked(conn);
3305 if (!sendnoop && !timedout) {
3306 spin_unlock(&conn->ibc_lock);
3311 CERROR("Timed out RDMA with %s (%lld): "
3312 "c: %u, oc: %u, rc: %u\n",
3313 libcfs_nid2str(peer_ni->ibp_nid),
3314 ktime_get_seconds() - peer_ni->ibp_last_alive,
3316 conn->ibc_outstanding_credits,
3317 conn->ibc_reserved_credits);
3318 list_add(&conn->ibc_connd_list, &closes);
3320 list_add(&conn->ibc_connd_list, &checksends);
3322 /* +ref for 'closes' or 'checksends' */
3323 kiblnd_conn_addref(conn);
3325 spin_unlock(&conn->ibc_lock);
3329 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3331 if (!list_empty(&timedout_txs))
3332 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
3333 LNET_MSG_STATUS_LOCAL_TIMEOUT);
3335 /* Handle timeout by closing the whole
3336 * connection. We can only be sure RDMA activity
3337 * has ceased once the QP has been modified. */
3338 while (!list_empty(&closes)) {
3339 conn = list_entry(closes.next,
3340 struct kib_conn, ibc_connd_list);
3341 list_del(&conn->ibc_connd_list);
3342 kiblnd_close_conn(conn, -ETIMEDOUT);
3343 kiblnd_conn_decref(conn);
3346 /* In case we have enough credits to return via a
3347 * NOOP, but there were no non-blocking tx descs
3348 * free to do it last time... */
3349 while (!list_empty(&checksends)) {
3350 conn = list_entry(checksends.next,
3351 struct kib_conn, ibc_connd_list);
3352 list_del(&conn->ibc_connd_list);
3354 spin_lock(&conn->ibc_lock);
3355 kiblnd_check_sends_locked(conn);
3356 spin_unlock(&conn->ibc_lock);
3358 kiblnd_conn_decref(conn);
3363 kiblnd_disconnect_conn(struct kib_conn *conn)
3365 LASSERT (!in_interrupt());
3366 LASSERT (current == kiblnd_data.kib_connd);
3367 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3369 rdma_disconnect(conn->ibc_cmid);
3370 kiblnd_finalise_conn(conn);
3372 kiblnd_peer_notify(conn->ibc_peer);
3376 * High-water for reconnection to the same peer_ni, reconnection attempt should
3377 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3379 #define KIB_RECONN_HIGH_RACE 10
3381 * Allow connd to take a break and handle other things after consecutive
3382 * reconnection attemps.
3384 #define KIB_RECONN_BREAK 100
3387 kiblnd_connd (void *arg)
3389 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3390 wait_queue_entry_t wait;
3391 unsigned long flags;
3392 struct kib_conn *conn;
3397 unsigned long deadline = jiffies;
3399 init_waitqueue_entry(&wait, current);
3400 kiblnd_data.kib_connd = current;
3402 spin_lock_irqsave(lock, flags);
3404 while (!kiblnd_data.kib_shutdown) {
3409 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3410 struct kib_peer_ni *peer_ni = NULL;
3412 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3413 struct kib_conn, ibc_list);
3414 list_del(&conn->ibc_list);
3415 if (conn->ibc_reconnect) {
3416 peer_ni = conn->ibc_peer;
3417 kiblnd_peer_addref(peer_ni);
3420 spin_unlock_irqrestore(lock, flags);
3423 kiblnd_destroy_conn(conn);
3425 spin_lock_irqsave(lock, flags);
3427 LIBCFS_FREE(conn, sizeof(*conn));
3431 conn->ibc_peer = peer_ni;
3432 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3433 list_add_tail(&conn->ibc_list,
3434 &kiblnd_data.kib_reconn_list);
3436 list_add_tail(&conn->ibc_list,
3437 &kiblnd_data.kib_reconn_wait);
3440 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3441 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3442 struct kib_conn, ibc_list);
3443 list_del(&conn->ibc_list);
3445 spin_unlock_irqrestore(lock, flags);
3448 kiblnd_disconnect_conn(conn);
3449 kiblnd_conn_decref(conn);
3451 spin_lock_irqsave(lock, flags);
3454 while (reconn < KIB_RECONN_BREAK) {
3455 if (kiblnd_data.kib_reconn_sec !=
3456 ktime_get_real_seconds()) {
3457 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3458 list_splice_init(&kiblnd_data.kib_reconn_wait,
3459 &kiblnd_data.kib_reconn_list);
3462 if (list_empty(&kiblnd_data.kib_reconn_list))
3465 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3466 struct kib_conn, ibc_list);
3467 list_del(&conn->ibc_list);
3469 spin_unlock_irqrestore(lock, flags);
3472 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3473 kiblnd_peer_decref(conn->ibc_peer);
3474 LIBCFS_FREE(conn, sizeof(*conn));
3476 spin_lock_irqsave(lock, flags);
3479 /* careful with the jiffy wrap... */
3480 timeout = (int)(deadline - jiffies);
3484 int chunk = kiblnd_data.kib_peer_hash_size;
3485 unsigned int lnd_timeout;
3487 spin_unlock_irqrestore(lock, flags);
3490 /* Time to check for RDMA timeouts on a few more
3491 * peers: I do checks every 'p' seconds on a
3492 * proportion of the peer_ni table and I need to check
3493 * every connection 'n' times within a timeout
3494 * interval, to ensure I detect a timeout on any
3495 * connection within (n+1)/n times the timeout
3498 lnd_timeout = kiblnd_timeout();
3499 if (lnd_timeout > n * p)
3500 chunk = (chunk * n * p) / lnd_timeout;
3504 for (i = 0; i < chunk; i++) {
3505 kiblnd_check_conns(peer_index);
3506 peer_index = (peer_index + 1) %
3507 kiblnd_data.kib_peer_hash_size;
3510 deadline += cfs_time_seconds(p);
3511 spin_lock_irqsave(lock, flags);
3517 /* Nothing to do for 'timeout' */
3518 set_current_state(TASK_INTERRUPTIBLE);
3519 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3520 spin_unlock_irqrestore(lock, flags);
3522 schedule_timeout(timeout);
3524 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3525 spin_lock_irqsave(lock, flags);
3528 spin_unlock_irqrestore(lock, flags);
3530 kiblnd_thread_fini();
3535 kiblnd_qp_event(struct ib_event *event, void *arg)
3537 struct kib_conn *conn = arg;
3539 switch (event->event) {
3540 case IB_EVENT_COMM_EST:
3541 CDEBUG(D_NET, "%s established\n",
3542 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3543 /* We received a packet but connection isn't established
3544 * probably handshake packet was lost, so free to
3545 * force make connection established */
3546 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3549 case IB_EVENT_PORT_ERR:
3550 case IB_EVENT_DEVICE_FATAL:
3551 CERROR("Fatal device error for NI %s\n",
3552 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3553 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
3556 case IB_EVENT_PORT_ACTIVE:
3557 CERROR("Port reactivated for NI %s\n",
3558 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3559 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
3563 CERROR("%s: Async QP event type %d\n",
3564 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3570 kiblnd_complete (struct ib_wc *wc)
3572 switch (kiblnd_wreqid2type(wc->wr_id)) {
3577 if (wc->status != IB_WC_SUCCESS &&
3578 wc->status != IB_WC_WR_FLUSH_ERR)
3579 CNETERR("FastReg failed: %d\n", wc->status);
3582 case IBLND_WID_RDMA:
3583 /* We only get RDMA completion notification if it fails. All
3584 * subsequent work items, including the final SEND will fail
3585 * too. However we can't print out any more info about the
3586 * failing RDMA because 'tx' might be back on the idle list or
3587 * even reused already if we didn't manage to post all our work
3589 CNETERR("RDMA (tx: %p) failed: %d\n",
3590 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3594 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3598 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3605 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3607 /* NB I'm not allowed to schedule this conn once its refcount has
3608 * reached 0. Since fundamentally I'm racing with scheduler threads
3609 * consuming my CQ I could be called after all completions have
3610 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3611 * and this CQ is about to be destroyed so I NOOP. */
3612 struct kib_conn *conn = arg;
3613 struct kib_sched_info *sched = conn->ibc_sched;
3614 unsigned long flags;
3616 LASSERT(cq == conn->ibc_cq);
3618 spin_lock_irqsave(&sched->ibs_lock, flags);
3620 conn->ibc_ready = 1;
3622 if (!conn->ibc_scheduled &&
3623 (conn->ibc_nrx > 0 ||
3624 conn->ibc_nsends_posted > 0)) {
3625 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3626 conn->ibc_scheduled = 1;
3627 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3629 if (waitqueue_active(&sched->ibs_waitq))
3630 wake_up(&sched->ibs_waitq);
3633 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3637 kiblnd_cq_event(struct ib_event *event, void *arg)
3639 struct kib_conn *conn = arg;
3641 CERROR("%s: async CQ event type %d\n",
3642 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3646 kiblnd_scheduler(void *arg)
3648 long id = (long)arg;
3649 struct kib_sched_info *sched;
3650 struct kib_conn *conn;
3651 wait_queue_entry_t wait;
3652 unsigned long flags;
3657 init_waitqueue_entry(&wait, current);
3659 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3661 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3663 CWARN("Unable to bind on CPU partition %d, please verify "
3664 "whether all CPUs are healthy and reload modules if "
3665 "necessary, otherwise your system might under risk of "
3666 "low performance\n", sched->ibs_cpt);
3669 spin_lock_irqsave(&sched->ibs_lock, flags);
3671 while (!kiblnd_data.kib_shutdown) {
3672 if (need_resched()) {
3673 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3677 spin_lock_irqsave(&sched->ibs_lock, flags);
3682 if (!list_empty(&sched->ibs_conns)) {
3683 conn = list_entry(sched->ibs_conns.next,
3684 struct kib_conn, ibc_sched_list);
3685 /* take over kib_sched_conns' ref on conn... */
3686 LASSERT(conn->ibc_scheduled);
3687 list_del(&conn->ibc_sched_list);
3688 conn->ibc_ready = 0;
3690 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3692 wc.wr_id = IBLND_WID_INVAL;
3694 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3696 rc = ib_req_notify_cq(conn->ibc_cq,
3699 CWARN("%s: ib_req_notify_cq failed: %d, "
3700 "closing connection\n",
3701 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3702 kiblnd_close_conn(conn, -EIO);
3703 kiblnd_conn_decref(conn);
3704 spin_lock_irqsave(&sched->ibs_lock,
3709 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3712 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3714 "ib_poll_cq (rc: %d) returned invalid "
3715 "wr_id, opcode %d, status: %d, "
3716 "vendor_err: %d, conn: %s status: %d\n"
3717 "please upgrade firmware and OFED or "
3718 "contact vendor.\n", rc,
3719 wc.opcode, wc.status, wc.vendor_err,
3720 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3726 CWARN("%s: ib_poll_cq failed: %d, "
3727 "closing connection\n",
3728 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3730 kiblnd_close_conn(conn, -EIO);
3731 kiblnd_conn_decref(conn);
3732 spin_lock_irqsave(&sched->ibs_lock, flags);
3736 spin_lock_irqsave(&sched->ibs_lock, flags);
3738 if (rc != 0 || conn->ibc_ready) {
3739 /* There may be another completion waiting; get
3740 * another scheduler to check while I handle
3742 /* +1 ref for sched_conns */
3743 kiblnd_conn_addref(conn);
3744 list_add_tail(&conn->ibc_sched_list,
3746 if (waitqueue_active(&sched->ibs_waitq))
3747 wake_up(&sched->ibs_waitq);
3749 conn->ibc_scheduled = 0;
3753 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3754 kiblnd_complete(&wc);
3756 spin_lock_irqsave(&sched->ibs_lock, flags);
3759 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3766 set_current_state(TASK_INTERRUPTIBLE);
3767 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3768 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3772 remove_wait_queue(&sched->ibs_waitq, &wait);
3773 set_current_state(TASK_RUNNING);
3774 spin_lock_irqsave(&sched->ibs_lock, flags);
3777 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3779 kiblnd_thread_fini();
3784 kiblnd_failover_thread(void *arg)
3786 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3787 struct kib_dev *dev;
3788 struct net *ns = arg;
3789 wait_queue_entry_t wait;
3790 unsigned long flags;
3793 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3795 init_waitqueue_entry(&wait, current);
3796 write_lock_irqsave(glock, flags);
3798 while (!kiblnd_data.kib_shutdown) {
3799 int do_failover = 0;
3802 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3804 if (ktime_get_seconds() < dev->ibd_next_failover)
3811 list_del_init(&dev->ibd_fail_list);
3812 dev->ibd_failover = 1;
3813 write_unlock_irqrestore(glock, flags);
3815 rc = kiblnd_dev_failover(dev, ns);
3817 write_lock_irqsave(glock, flags);
3819 LASSERT (dev->ibd_failover);
3820 dev->ibd_failover = 0;
3821 if (rc >= 0) { /* Device is OK or failover succeed */
3822 dev->ibd_next_failover = ktime_get_seconds() + 3;
3826 /* failed to failover, retry later */
3827 dev->ibd_next_failover = ktime_get_seconds() +
3828 min(dev->ibd_failed_failover, 10);
3829 if (kiblnd_dev_can_failover(dev)) {
3830 list_add_tail(&dev->ibd_fail_list,
3831 &kiblnd_data.kib_failed_devs);
3837 /* long sleep if no more pending failover */
3838 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3840 set_current_state(TASK_INTERRUPTIBLE);
3841 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3842 write_unlock_irqrestore(glock, flags);
3844 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3845 cfs_time_seconds(1));
3846 set_current_state(TASK_RUNNING);
3847 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3848 write_lock_irqsave(glock, flags);
3850 if (!long_sleep || rc != 0)
3853 /* have a long sleep, routine check all active devices,
3854 * we need checking like this because if there is not active
3855 * connection on the dev and no SEND from local, we may listen
3856 * on wrong HCA for ever while there is a bonding failover */
3857 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3858 if (kiblnd_dev_can_failover(dev)) {
3859 list_add_tail(&dev->ibd_fail_list,
3860 &kiblnd_data.kib_failed_devs);
3865 write_unlock_irqrestore(glock, flags);
3867 kiblnd_thread_fini();