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 pages: %d\n", nob, rc);
618 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
621 rd->rd_key = tx->tx_fmr.fmr_key;
623 * for FastReg or FMR with no gaps we can accumulate all
624 * the fragments in one FastReg or FMR fragment.
626 if (((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED) && !tx->tx_gaps) ||
627 (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
628 /* FMR requires zero based address */
629 if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
630 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
631 rd->rd_frags[0].rf_nob = nob;
635 * We're transmitting with gaps using FMR.
636 * We'll need to use multiple fragments and identify the
637 * zero based address of each fragment.
639 for (i = 0; i < rd->rd_nfrags; i++) {
640 rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
641 rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
649 kiblnd_unmap_tx(struct kib_tx *tx)
651 if (tx->tx_fmr.fmr_pfmr || tx->tx_fmr.fmr_frd)
652 kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);
654 if (tx->tx_nfrags != 0) {
655 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
656 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
661 #ifdef HAVE_IB_GET_DMA_MR
662 static struct ib_mr *
663 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, struct kib_rdma_desc *rd)
665 struct kib_net *net = ni->ni_data;
666 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
667 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
669 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
672 * if map-on-demand is turned on and the device supports
673 * either FMR or FastReg then use that. Otherwise use global
674 * memory regions. If that's not available either, then you're
675 * dead in the water and fail the operation.
677 if (tunables->lnd_map_on_demand &&
678 (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED ||
679 net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED))
683 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
684 * in the call chain. The mapping will fail with appropriate error
687 return hdev->ibh_mrs;
691 static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx,
692 struct kib_rdma_desc *rd, int nfrags)
694 struct kib_net *net = ni->ni_data;
695 struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
696 #ifdef HAVE_IB_GET_DMA_MR
697 struct ib_mr *mr = NULL;
702 /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
704 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
705 tx->tx_nfrags = nfrags;
707 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
708 tx->tx_nfrags, tx->tx_dmadir);
710 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
711 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
712 hdev->ibh_ibdev, &tx->tx_frags[i]);
713 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
714 hdev->ibh_ibdev, &tx->tx_frags[i]);
715 nob += rd->rd_frags[i].rf_nob;
718 #ifdef HAVE_IB_GET_DMA_MR
719 mr = kiblnd_find_rd_dma_mr(ni, rd);
721 /* found pre-mapping MR */
722 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
727 if (net->ibn_fmr_ps != NULL)
728 return kiblnd_fmr_map_tx(net, tx, rd, nob);
733 static int kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
734 struct kib_rdma_desc *rd, int nkiov,
735 struct bio_vec *kiov, int offset, int nob)
737 struct kib_net *net = ni->ni_data;
738 struct scatterlist *sg;
742 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
746 LASSERT(net != NULL);
748 while (offset >= kiov->bv_len) {
749 offset -= kiov->bv_len;
761 fragnob = min((int)(kiov->bv_len - offset), nob);
764 * We're allowed to start at a non-aligned page offset in
765 * the first fragment and end at a non-aligned page offset
766 * in the last fragment.
768 if ((fragnob < (int)(kiov->bv_len - offset)) &&
769 nkiov < max_nkiov && nob > fragnob) {
770 CDEBUG(D_NET, "fragnob %d < available page %d: with"
771 " remaining %d kiovs with %d nob left\n",
772 fragnob, (int)(kiov->bv_len - offset),
777 sg_set_page(sg, kiov->bv_page, fragnob,
778 kiov->bv_offset + offset);
781 CERROR("lacking enough sg entries to map tx\n");
791 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
795 kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
796 __must_hold(&conn->ibc_lock)
798 struct kib_msg *msg = tx->tx_msg;
799 struct kib_peer_ni *peer_ni = conn->ibc_peer;
800 struct lnet_ni *ni = peer_ni->ibp_ni;
801 int ver = conn->ibc_version;
805 LASSERT(tx->tx_queued);
806 /* We rely on this for QP sizing */
807 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
808 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
810 LASSERT(credit == 0 || credit == 1);
811 LASSERT(conn->ibc_outstanding_credits >= 0);
812 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
813 LASSERT(conn->ibc_credits >= 0);
814 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
816 if (conn->ibc_nsends_posted ==
817 kiblnd_concurrent_sends(ver, ni)) {
818 /* tx completions outstanding... */
819 CDEBUG(D_NET, "%s: posted enough\n",
820 libcfs_nid2str(peer_ni->ibp_nid));
824 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
825 CDEBUG(D_NET, "%s: no credits\n",
826 libcfs_nid2str(peer_ni->ibp_nid));
830 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
831 conn->ibc_credits == 1 && /* last credit reserved */
832 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
833 CDEBUG(D_NET, "%s: not using last credit\n",
834 libcfs_nid2str(peer_ni->ibp_nid));
838 /* NB don't drop ibc_lock before bumping tx_sending */
839 list_del(&tx->tx_list);
842 if (msg->ibm_type == IBLND_MSG_NOOP &&
843 (!kiblnd_need_noop(conn) || /* redundant NOOP */
844 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
845 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
846 /* OK to drop when posted enough NOOPs, since
847 * kiblnd_check_sends_locked will queue NOOP again when
848 * posted NOOPs complete */
849 spin_unlock(&conn->ibc_lock);
850 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
852 spin_lock(&conn->ibc_lock);
853 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
854 libcfs_nid2str(peer_ni->ibp_nid),
855 conn->ibc_noops_posted);
859 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
860 peer_ni->ibp_nid, conn->ibc_incarnation);
862 conn->ibc_credits -= credit;
863 conn->ibc_outstanding_credits = 0;
864 conn->ibc_nsends_posted++;
865 if (msg->ibm_type == IBLND_MSG_NOOP)
866 conn->ibc_noops_posted++;
868 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
869 * PUT. If so, it was first queued here as a PUT_REQ, sent and
870 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
871 * and then re-queued here. It's (just) possible that
872 * tx_sending is non-zero if we've not done the tx_complete()
873 * from the first send; hence the ++ rather than = below. */
875 list_add(&tx->tx_list, &conn->ibc_active_txs);
877 /* I'm still holding ibc_lock! */
878 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
880 } else if (tx->tx_pool->tpo_pool.po_failed ||
881 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
882 /* close_conn will launch failover */
885 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
886 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
887 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
890 if (!frd->frd_valid) {
891 wr = &frd->frd_inv_wr.wr;
892 wr->next = &frd->frd_fastreg_wr.wr;
894 wr = &frd->frd_fastreg_wr.wr;
896 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
899 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
900 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
901 bad->wr_id, bad->opcode, bad->send_flags,
902 libcfs_nid2str(conn->ibc_peer->ibp_nid));
905 if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
908 #ifdef HAVE_IB_POST_SEND_RECV_CONST
909 rc = ib_post_send(conn->ibc_cmid->qp, wr,
910 (const struct ib_send_wr **)&bad);
912 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
916 conn->ibc_last_send = ktime_get();
921 /* NB credits are transferred in the actual
922 * message, which can only be the last work item */
923 conn->ibc_credits += credit;
924 conn->ibc_outstanding_credits += msg->ibm_credits;
925 conn->ibc_nsends_posted--;
926 if (msg->ibm_type == IBLND_MSG_NOOP)
927 conn->ibc_noops_posted--;
933 done = (tx->tx_sending == 0);
935 list_del(&tx->tx_list);
937 spin_unlock(&conn->ibc_lock);
939 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
940 CERROR("Error %d posting transmit to %s\n",
941 rc, libcfs_nid2str(peer_ni->ibp_nid));
943 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
944 rc, libcfs_nid2str(peer_ni->ibp_nid));
946 kiblnd_close_conn(conn, rc);
951 spin_lock(&conn->ibc_lock);
957 kiblnd_check_sends_locked(struct kib_conn *conn)
959 int ver = conn->ibc_version;
960 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
963 /* Don't send anything until after the connection is established */
964 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
965 CDEBUG(D_NET, "%s too soon\n",
966 libcfs_nid2str(conn->ibc_peer->ibp_nid));
970 LASSERT(conn->ibc_nsends_posted <=
971 kiblnd_concurrent_sends(ver, ni));
972 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
973 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
974 LASSERT (conn->ibc_reserved_credits >= 0);
976 while (conn->ibc_reserved_credits > 0 &&
977 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
978 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
979 struct kib_tx, tx_list);
980 list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
981 conn->ibc_reserved_credits--;
984 if (kiblnd_need_noop(conn)) {
985 spin_unlock(&conn->ibc_lock);
987 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
989 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
991 spin_lock(&conn->ibc_lock);
993 kiblnd_queue_tx_locked(tx, conn);
999 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1001 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1002 struct kib_tx, tx_list);
1003 } else if (!list_empty(&conn->ibc_tx_noops)) {
1004 LASSERT (!IBLND_OOB_CAPABLE(ver));
1006 tx = list_entry(conn->ibc_tx_noops.next,
1007 struct kib_tx, tx_list);
1008 } else if (!list_empty(&conn->ibc_tx_queue)) {
1010 tx = list_entry(conn->ibc_tx_queue.next,
1011 struct kib_tx, tx_list);
1015 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1021 kiblnd_tx_complete(struct kib_tx *tx, int status)
1023 int failed = (status != IB_WC_SUCCESS);
1024 struct kib_conn *conn = tx->tx_conn;
1027 if (tx->tx_sending <= 0) {
1028 CERROR("Received an event on a freed tx: %p status %d\n",
1034 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1035 CNETERR("Tx -> %s cookie %#llx"
1036 " sending %d waiting %d: failed %d\n",
1037 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1038 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1041 kiblnd_close_conn(conn, -EIO);
1043 kiblnd_peer_alive(conn->ibc_peer);
1046 spin_lock(&conn->ibc_lock);
1048 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1049 * gets to free it, which also drops its ref on 'conn'. */
1052 conn->ibc_nsends_posted--;
1053 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1054 conn->ibc_noops_posted--;
1057 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
1058 tx->tx_waiting = 0; /* don't wait for peer_ni */
1059 tx->tx_status = -EIO;
1062 idle = (tx->tx_sending == 0) && /* This is the final callback */
1063 !tx->tx_waiting && /* Not waiting for peer_ni */
1064 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1066 list_del(&tx->tx_list);
1068 kiblnd_check_sends_locked(conn);
1069 spin_unlock(&conn->ibc_lock);
1076 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1079 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1080 struct ib_sge *sge = &tx->tx_msgsge;
1081 struct ib_rdma_wr *wrq;
1082 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1083 #ifdef HAVE_IB_GET_DMA_MR
1084 struct ib_mr *mr = hdev->ibh_mrs;
1087 LASSERT(tx->tx_nwrq >= 0);
1088 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1089 LASSERT(nob <= IBLND_MSG_SIZE);
1090 #ifdef HAVE_IB_GET_DMA_MR
1091 LASSERT(mr != NULL);
1094 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1096 #ifdef HAVE_IB_GET_DMA_MR
1097 sge->lkey = mr->lkey;
1099 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1101 sge->addr = tx->tx_msgaddr;
1104 wrq = &tx->tx_wrq[tx->tx_nwrq];
1105 memset(wrq, 0, sizeof(*wrq));
1107 wrq->wr.next = NULL;
1108 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1109 wrq->wr.sg_list = sge;
1110 wrq->wr.num_sge = 1;
1111 wrq->wr.opcode = IB_WR_SEND;
1112 wrq->wr.send_flags = IB_SEND_SIGNALED;
1118 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1119 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
1121 struct kib_msg *ibmsg = tx->tx_msg;
1122 struct kib_rdma_desc *srcrd = tx->tx_rd;
1123 struct ib_rdma_wr *wrq = NULL;
1131 LASSERT(!in_interrupt());
1132 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1133 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1135 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1136 resid > 0; resid -= sge_nob) {
1139 if (srcidx >= srcrd->rd_nfrags) {
1140 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1145 if (dstidx >= dstrd->rd_nfrags) {
1146 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1151 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1152 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1153 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1154 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1155 conn->ibc_max_frags,
1156 srcidx, srcrd->rd_nfrags,
1157 dstidx, dstrd->rd_nfrags);
1162 sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1163 kiblnd_rd_frag_size(dstrd, dstidx),
1166 sge = &tx->tx_sge[tx->tx_nsge];
1167 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1168 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1169 sge->length = sge_nob;
1172 wrq = &tx->tx_wrq[tx->tx_nwrq];
1174 wrq->wr.next = &(wrq + 1)->wr;
1175 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1176 wrq->wr.sg_list = sge;
1177 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1178 wrq->wr.send_flags = 0;
1180 #ifdef HAVE_IB_RDMA_WR
1181 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1183 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1186 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1188 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1193 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1194 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1197 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1199 wrq->wr.num_sge = wrq_sge;
1205 if (rc < 0) /* no RDMA if completing with failure */
1206 tx->tx_nwrq = tx->tx_nsge = 0;
1208 ibmsg->ibm_u.completion.ibcm_status = rc;
1209 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1210 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1211 type, sizeof(struct kib_completion_msg));
1217 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1219 struct list_head *q;
1222 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1223 LASSERT(!tx->tx_queued); /* not queued for sending already */
1224 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1226 if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
1227 tx->tx_status = -ECONNABORTED;
1229 if (tx->tx_conn != NULL) {
1230 /* PUT_DONE first attached to conn as a PUT_REQ */
1231 LASSERT(tx->tx_conn == conn);
1232 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1234 kiblnd_conn_decref(conn);
1236 list_add(&tx->tx_list, &conn->ibc_zombie_txs);
1241 timeout_ns = kiblnd_timeout() * NSEC_PER_SEC;
1243 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1245 if (tx->tx_conn == NULL) {
1246 kiblnd_conn_addref(conn);
1248 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1250 /* PUT_DONE first attached to conn as a PUT_REQ */
1251 LASSERT (tx->tx_conn == conn);
1252 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1255 switch (tx->tx_msg->ibm_type) {
1259 case IBLND_MSG_PUT_REQ:
1260 case IBLND_MSG_GET_REQ:
1261 q = &conn->ibc_tx_queue_rsrvd;
1264 case IBLND_MSG_PUT_NAK:
1265 case IBLND_MSG_PUT_ACK:
1266 case IBLND_MSG_PUT_DONE:
1267 case IBLND_MSG_GET_DONE:
1268 q = &conn->ibc_tx_queue_nocred;
1271 case IBLND_MSG_NOOP:
1272 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1273 q = &conn->ibc_tx_queue_nocred;
1275 q = &conn->ibc_tx_noops;
1278 case IBLND_MSG_IMMEDIATE:
1279 q = &conn->ibc_tx_queue;
1283 list_add_tail(&tx->tx_list, q);
1287 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1289 spin_lock(&conn->ibc_lock);
1290 kiblnd_queue_tx_locked(tx, conn);
1291 kiblnd_check_sends_locked(conn);
1292 spin_unlock(&conn->ibc_lock);
1295 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1296 struct sockaddr_in *srcaddr,
1297 struct sockaddr_in *dstaddr,
1300 unsigned short port;
1303 /* allow the port to be reused */
1304 rc = rdma_set_reuseaddr(cmid, 1);
1306 CERROR("Unable to set reuse on cmid: %d\n", rc);
1310 /* look for a free privileged port */
1311 for (port = PROT_SOCK-1; port > 0; port--) {
1312 srcaddr->sin_port = htons(port);
1313 rc = rdma_resolve_addr(cmid,
1314 (struct sockaddr *)srcaddr,
1315 (struct sockaddr *)dstaddr,
1318 CDEBUG(D_NET, "bound to port %hu\n", port);
1320 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1321 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1328 CERROR("Failed to bind to a free privileged port\n");
1333 kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
1335 struct rdma_cm_id *cmid;
1336 struct kib_dev *dev;
1337 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1338 struct sockaddr_in srcaddr;
1339 struct sockaddr_in dstaddr;
1342 LASSERT (net != NULL);
1343 LASSERT (peer_ni->ibp_connecting > 0);
1345 cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
1346 kiblnd_cm_callback, peer_ni,
1347 RDMA_PS_TCP, IB_QPT_RC);
1350 CERROR("Can't create CMID for %s: %ld\n",
1351 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1357 memset(&srcaddr, 0, sizeof(srcaddr));
1358 srcaddr.sin_family = AF_INET;
1359 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1361 memset(&dstaddr, 0, sizeof(dstaddr));
1362 dstaddr.sin_family = AF_INET;
1363 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1364 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1366 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1368 if (*kiblnd_tunables.kib_use_priv_port) {
1369 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1370 kiblnd_timeout() * 1000);
1372 rc = rdma_resolve_addr(cmid,
1373 (struct sockaddr *)&srcaddr,
1374 (struct sockaddr *)&dstaddr,
1375 kiblnd_timeout() * 1000);
1378 /* Can't initiate address resolution: */
1379 CERROR("Can't resolve addr for %s: %d\n",
1380 libcfs_nid2str(peer_ni->ibp_nid), rc);
1387 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1388 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1389 rdma_destroy_id(cmid);
1392 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1396 kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
1398 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1399 char *reason = NULL;
1401 unsigned long flags;
1403 write_lock_irqsave(glock, flags);
1404 if (peer_ni->ibp_reconnecting == 0) {
1405 if (peer_ni->ibp_accepting)
1406 reason = "accepting";
1407 else if (peer_ni->ibp_connecting)
1408 reason = "connecting";
1409 else if (!list_empty(&peer_ni->ibp_conns))
1410 reason = "connected";
1411 else /* connected then closed */
1417 if (peer_ni->ibp_accepting)
1418 CNETERR("Detecting race between accepting and reconnecting\n");
1419 peer_ni->ibp_reconnecting--;
1421 if (!kiblnd_peer_active(peer_ni)) {
1422 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1423 reason = "unlinked";
1427 peer_ni->ibp_connecting++;
1428 peer_ni->ibp_reconnected++;
1430 write_unlock_irqrestore(glock, flags);
1432 kiblnd_connect_peer(peer_ni);
1436 write_unlock_irqrestore(glock, flags);
1438 CWARN("Abort reconnection of %s: %s\n",
1439 libcfs_nid2str(peer_ni->ibp_nid), reason);
1440 kiblnd_txlist_done(&txs, -ECONNABORTED,
1441 LNET_MSG_STATUS_LOCAL_ABORTED);
1446 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1448 struct kib_peer_ni *peer_ni;
1449 struct kib_peer_ni *peer2;
1450 struct kib_conn *conn;
1451 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1452 unsigned long flags;
1455 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1457 /* If I get here, I've committed to send, so I complete the tx with
1458 * failure on any problems */
1460 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1461 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1463 /* First time, just use a read lock since I expect to find my peer_ni
1465 read_lock_irqsave(g_lock, flags);
1467 peer_ni = kiblnd_find_peer_locked(ni, nid);
1468 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1469 /* Found a peer_ni with an established connection */
1470 conn = kiblnd_get_conn_locked(peer_ni);
1471 kiblnd_conn_addref(conn); /* 1 ref for me... */
1473 read_unlock_irqrestore(g_lock, flags);
1476 kiblnd_queue_tx(tx, conn);
1477 kiblnd_conn_decref(conn); /* ...to here */
1481 read_unlock(g_lock);
1482 /* Re-try with a write lock */
1485 peer_ni = kiblnd_find_peer_locked(ni, nid);
1486 if (peer_ni != NULL) {
1487 if (list_empty(&peer_ni->ibp_conns)) {
1488 /* found a peer_ni, but it's still connecting... */
1489 LASSERT(kiblnd_peer_connecting(peer_ni));
1491 list_add_tail(&tx->tx_list,
1492 &peer_ni->ibp_tx_queue);
1493 write_unlock_irqrestore(g_lock, flags);
1495 conn = kiblnd_get_conn_locked(peer_ni);
1496 kiblnd_conn_addref(conn); /* 1 ref for me... */
1498 write_unlock_irqrestore(g_lock, flags);
1501 kiblnd_queue_tx(tx, conn);
1502 kiblnd_conn_decref(conn); /* ...to here */
1507 write_unlock_irqrestore(g_lock, flags);
1509 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1510 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1512 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1514 tx->tx_status = -EHOSTUNREACH;
1516 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1522 write_lock_irqsave(g_lock, flags);
1524 peer2 = kiblnd_find_peer_locked(ni, nid);
1525 if (peer2 != NULL) {
1526 if (list_empty(&peer2->ibp_conns)) {
1527 /* found a peer_ni, but it's still connecting... */
1528 LASSERT(kiblnd_peer_connecting(peer2));
1530 list_add_tail(&tx->tx_list,
1531 &peer2->ibp_tx_queue);
1532 write_unlock_irqrestore(g_lock, flags);
1534 conn = kiblnd_get_conn_locked(peer2);
1535 kiblnd_conn_addref(conn); /* 1 ref for me... */
1537 write_unlock_irqrestore(g_lock, flags);
1540 kiblnd_queue_tx(tx, conn);
1541 kiblnd_conn_decref(conn); /* ...to here */
1544 kiblnd_peer_decref(peer_ni);
1548 /* Brand new peer_ni */
1549 LASSERT(peer_ni->ibp_connecting == 0);
1550 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1551 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1553 /* always called with a ref on ni, which prevents ni being shutdown */
1554 LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);
1557 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1559 kiblnd_peer_addref(peer_ni);
1560 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1562 write_unlock_irqrestore(g_lock, flags);
1564 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1565 kiblnd_connect_peer(peer_ni);
1566 kiblnd_peer_decref(peer_ni);
1570 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1572 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1573 int type = lntmsg->msg_type;
1574 struct lnet_process_id target = lntmsg->msg_target;
1575 int target_is_router = lntmsg->msg_target_is_router;
1576 int routing = lntmsg->msg_routing;
1577 unsigned int payload_niov = lntmsg->msg_niov;
1578 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1579 unsigned int payload_offset = lntmsg->msg_offset;
1580 unsigned int payload_nob = lntmsg->msg_len;
1581 struct kib_msg *ibmsg;
1582 struct kib_rdma_desc *rd;
1587 /* NB 'private' is different depending on what we're sending.... */
1589 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1590 payload_nob, payload_niov, libcfs_id2str(target));
1592 LASSERT (payload_nob == 0 || payload_niov > 0);
1593 LASSERT (payload_niov <= LNET_MAX_IOV);
1595 /* Thread context */
1596 LASSERT (!in_interrupt());
1604 LASSERT (payload_nob == 0);
1608 if (routing || target_is_router)
1609 break; /* send IMMEDIATE */
1611 /* is the REPLY message too small for RDMA? */
1612 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1613 if (nob <= IBLND_MSG_SIZE)
1614 break; /* send IMMEDIATE */
1616 tx = kiblnd_get_idle_tx(ni, target.nid);
1618 CERROR("Can't allocate txd for GET to %s\n",
1619 libcfs_nid2str(target.nid));
1624 rd = &ibmsg->ibm_u.get.ibgm_rd;
1625 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1626 lntmsg->msg_md->md_niov,
1627 lntmsg->msg_md->md_kiov,
1628 0, lntmsg->msg_md->md_length);
1630 CERROR("Can't setup GET sink for %s: %d\n",
1631 libcfs_nid2str(target.nid), rc);
1632 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1637 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1638 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1639 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1641 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1643 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1644 if (tx->tx_lntmsg[1] == NULL) {
1645 CERROR("Can't create reply for GET -> %s\n",
1646 libcfs_nid2str(target.nid));
1651 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1652 tx->tx_waiting = 1; /* waiting for GET_DONE */
1653 kiblnd_launch_tx(ni, tx, target.nid);
1656 case LNET_MSG_REPLY:
1658 /* Is the payload small enough not to need RDMA? */
1659 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1660 if (nob <= IBLND_MSG_SIZE)
1661 break; /* send IMMEDIATE */
1663 tx = kiblnd_get_idle_tx(ni, target.nid);
1665 CERROR("Can't allocate %s txd for %s\n",
1666 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1667 libcfs_nid2str(target.nid));
1671 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1672 payload_niov, payload_kiov,
1673 payload_offset, payload_nob);
1675 CERROR("Can't setup PUT src for %s: %d\n",
1676 libcfs_nid2str(target.nid), rc);
1682 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1683 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1684 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
1685 sizeof(struct kib_putreq_msg));
1687 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1688 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1689 kiblnd_launch_tx(ni, tx, target.nid);
1693 /* send IMMEDIATE */
1694 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1697 tx = kiblnd_get_idle_tx(ni, target.nid);
1699 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1700 type, libcfs_nid2str(target.nid));
1705 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1707 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1708 offsetof(struct kib_msg,
1709 ibm_u.immediate.ibim_payload),
1710 payload_niov, payload_kiov,
1711 payload_offset, payload_nob);
1713 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1714 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1716 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1717 kiblnd_launch_tx(ni, tx, target.nid);
1722 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1724 struct lnet_process_id target = lntmsg->msg_target;
1725 unsigned int niov = lntmsg->msg_niov;
1726 struct bio_vec *kiov = lntmsg->msg_kiov;
1727 unsigned int offset = lntmsg->msg_offset;
1728 unsigned int nob = lntmsg->msg_len;
1732 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1734 CERROR("Can't get tx for REPLY to %s\n",
1735 libcfs_nid2str(target.nid));
1742 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1743 niov, kiov, offset, nob);
1746 CERROR("Can't setup GET src for %s: %d\n",
1747 libcfs_nid2str(target.nid), rc);
1751 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1752 IBLND_MSG_GET_DONE, nob,
1753 &rx->rx_msg->ibm_u.get.ibgm_rd,
1754 rx->rx_msg->ibm_u.get.ibgm_cookie);
1756 CERROR("Can't setup rdma for GET from %s: %d\n",
1757 libcfs_nid2str(target.nid), rc);
1762 /* No RDMA: local completion may happen now! */
1763 lnet_finalize(lntmsg, 0);
1765 /* RDMA: lnet_finalize(lntmsg) when it
1767 tx->tx_lntmsg[0] = lntmsg;
1770 kiblnd_queue_tx(tx, rx->rx_conn);
1775 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1778 lnet_finalize(lntmsg, -EIO);
1782 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1783 int delayed, unsigned int niov, struct bio_vec *kiov,
1784 unsigned int offset, unsigned int mlen, unsigned int rlen)
1786 struct kib_rx *rx = private;
1787 struct kib_msg *rxmsg = rx->rx_msg;
1788 struct kib_conn *conn = rx->rx_conn;
1792 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1795 LASSERT (mlen <= rlen);
1796 LASSERT (!in_interrupt());
1798 switch (rxmsg->ibm_type) {
1802 case IBLND_MSG_IMMEDIATE:
1803 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1804 if (nob > rx->rx_nob) {
1805 CERROR ("Immediate message from %s too big: %d(%d)\n",
1806 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1812 lnet_copy_flat2kiov(niov, kiov, offset,
1813 IBLND_MSG_SIZE, rxmsg,
1814 offsetof(struct kib_msg,
1815 ibm_u.immediate.ibim_payload),
1817 lnet_finalize(lntmsg, 0);
1820 case IBLND_MSG_PUT_REQ: {
1821 struct kib_msg *txmsg;
1822 struct kib_rdma_desc *rd;
1823 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1826 lnet_finalize(lntmsg, 0);
1827 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1832 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1834 CERROR("Can't allocate tx for %s\n",
1835 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1836 /* Not replying will break the connection */
1842 rd = &txmsg->ibm_u.putack.ibpam_rd;
1843 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1844 niov, kiov, offset, mlen);
1846 CERROR("Can't setup PUT sink for %s: %d\n",
1847 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1848 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1850 /* tell peer_ni it's over */
1851 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1856 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1857 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1858 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1860 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1862 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1863 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1864 kiblnd_queue_tx(tx, conn);
1866 /* reposted buffer reserved for PUT_DONE */
1867 post_credit = IBLND_POSTRX_NO_CREDIT;
1871 case IBLND_MSG_GET_REQ:
1872 if (lntmsg != NULL) {
1873 /* Optimized GET; RDMA lntmsg's payload */
1874 kiblnd_reply(ni, rx, lntmsg);
1876 /* GET didn't match anything */
1877 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1879 rxmsg->ibm_u.get.ibgm_cookie);
1884 kiblnd_post_rx(rx, post_credit);
1889 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1891 struct task_struct *task = kthread_run(fn, arg, name);
1894 return PTR_ERR(task);
1896 atomic_inc(&kiblnd_data.kib_nthreads);
1901 kiblnd_thread_fini (void)
1903 atomic_dec (&kiblnd_data.kib_nthreads);
1907 kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
1909 /* This is racy, but everyone's only writing ktime_get_seconds() */
1910 peer_ni->ibp_last_alive = ktime_get_seconds();
1915 kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
1918 time64_t last_alive = 0;
1919 unsigned long flags;
1921 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1923 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1924 error = peer_ni->ibp_error;
1925 peer_ni->ibp_error = 0;
1927 last_alive = peer_ni->ibp_last_alive;
1930 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1933 lnet_notify(peer_ni->ibp_ni,
1934 peer_ni->ibp_nid, false, false, last_alive);
1938 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
1940 /* This just does the immediate housekeeping. 'error' is zero for a
1941 * normal shutdown which can happen only after the connection has been
1942 * established. If the connection is established, schedule the
1943 * connection to be finished off by the connd. Otherwise the connd is
1944 * already dealing with it (either to set it up or tear it down).
1945 * Caller holds kib_global_lock exclusively in irq context */
1946 struct kib_peer_ni *peer_ni = conn->ibc_peer;
1947 struct kib_dev *dev;
1948 unsigned long flags;
1950 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1952 if (error != 0 && conn->ibc_comms_error == 0)
1953 conn->ibc_comms_error = error;
1955 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1956 return; /* already being handled */
1959 list_empty(&conn->ibc_tx_noops) &&
1960 list_empty(&conn->ibc_tx_queue) &&
1961 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1962 list_empty(&conn->ibc_tx_queue_nocred) &&
1963 list_empty(&conn->ibc_active_txs)) {
1964 CDEBUG(D_NET, "closing conn to %s\n",
1965 libcfs_nid2str(peer_ni->ibp_nid));
1967 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1968 libcfs_nid2str(peer_ni->ibp_nid), error,
1969 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1970 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1971 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1972 "" : "(sending_rsrvd)",
1973 list_empty(&conn->ibc_tx_queue_nocred) ?
1974 "" : "(sending_nocred)",
1975 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
1978 dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
1979 if (peer_ni->ibp_next_conn == conn)
1980 /* clear next_conn so it won't be used */
1981 peer_ni->ibp_next_conn = NULL;
1982 list_del(&conn->ibc_list);
1983 /* connd (see below) takes over ibc_list's ref */
1985 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
1986 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
1987 kiblnd_unlink_peer_locked(peer_ni);
1989 /* set/clear error on last conn */
1990 peer_ni->ibp_error = conn->ibc_comms_error;
1993 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
1996 kiblnd_dev_can_failover(dev)) {
1997 list_add_tail(&dev->ibd_fail_list,
1998 &kiblnd_data.kib_failed_devs);
1999 wake_up(&kiblnd_data.kib_failover_waitq);
2002 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2004 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2005 wake_up(&kiblnd_data.kib_connd_waitq);
2007 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2011 kiblnd_close_conn(struct kib_conn *conn, int error)
2013 unsigned long flags;
2015 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2017 kiblnd_close_conn_locked(conn, error);
2019 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2023 kiblnd_handle_early_rxs(struct kib_conn *conn)
2025 unsigned long flags;
2028 LASSERT(!in_interrupt());
2029 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2031 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2032 while (!list_empty(&conn->ibc_early_rxs)) {
2033 rx = list_entry(conn->ibc_early_rxs.next,
2034 struct kib_rx, rx_list);
2035 list_del(&rx->rx_list);
2036 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2038 kiblnd_handle_rx(rx);
2040 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2042 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2046 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
2049 struct list_head *tmp;
2050 struct list_head *nxt;
2053 spin_lock(&conn->ibc_lock);
2055 list_for_each_safe(tmp, nxt, txs) {
2056 tx = list_entry(tmp, struct kib_tx, tx_list);
2058 if (txs == &conn->ibc_active_txs) {
2059 LASSERT(!tx->tx_queued);
2060 LASSERT(tx->tx_waiting ||
2061 tx->tx_sending != 0);
2062 if (conn->ibc_comms_error == -ETIMEDOUT) {
2063 if (tx->tx_waiting && !tx->tx_sending)
2065 LNET_MSG_STATUS_REMOTE_TIMEOUT;
2066 else if (tx->tx_sending)
2068 LNET_MSG_STATUS_NETWORK_TIMEOUT;
2071 LASSERT(tx->tx_queued);
2072 if (conn->ibc_comms_error == -ETIMEDOUT)
2073 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2075 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
2078 tx->tx_status = -ECONNABORTED;
2082 * TODO: This makes an assumption that
2083 * kiblnd_tx_complete() will be called for each tx. If
2084 * that event is dropped we could end up with stale
2085 * connections floating around. We'd like to deal with
2086 * that in a better way.
2088 * Also that means we can exceed the timeout by many
2091 if (tx->tx_sending == 0) {
2093 list_move(&tx->tx_list, &zombies);
2097 spin_unlock(&conn->ibc_lock);
2100 * aborting transmits occurs when finalizing the connection.
2101 * The connection is finalized on error.
2102 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
2103 * override the value already set in tx->tx_hstatus above.
2105 kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
2109 kiblnd_finalise_conn(struct kib_conn *conn)
2111 LASSERT (!in_interrupt());
2112 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2114 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2115 * for connections that didn't get as far as being connected, because
2116 * rdma_disconnect() does this for free. */
2117 kiblnd_abort_receives(conn);
2119 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2121 /* Complete all tx descs not waiting for sends to complete.
2122 * NB we should be safe from RDMA now that the QP has changed state */
2124 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2125 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2126 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2127 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2128 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2130 kiblnd_handle_early_rxs(conn);
2134 kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
2138 unsigned long flags;
2140 LASSERT (error != 0);
2141 LASSERT (!in_interrupt());
2143 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2146 LASSERT(peer_ni->ibp_connecting > 0);
2147 peer_ni->ibp_connecting--;
2149 LASSERT (peer_ni->ibp_accepting > 0);
2150 peer_ni->ibp_accepting--;
2153 if (kiblnd_peer_connecting(peer_ni)) {
2154 /* another connection attempt under way... */
2155 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2160 peer_ni->ibp_reconnected = 0;
2161 if (list_empty(&peer_ni->ibp_conns)) {
2162 /* Take peer_ni's blocked transmits to complete with error */
2163 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2165 if (kiblnd_peer_active(peer_ni))
2166 kiblnd_unlink_peer_locked(peer_ni);
2168 peer_ni->ibp_error = error;
2170 /* Can't have blocked transmits if there are connections */
2171 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2174 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2176 kiblnd_peer_notify(peer_ni);
2178 if (list_empty(&zombies))
2181 CNETERR("Deleting messages for %s: connection failed\n",
2182 libcfs_nid2str(peer_ni->ibp_nid));
2184 kiblnd_txlist_done(&zombies, error,
2185 LNET_MSG_STATUS_LOCAL_DROPPED);
2189 kiblnd_connreq_done(struct kib_conn *conn, int status)
2191 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2194 unsigned long flags;
2197 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2199 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2200 libcfs_nid2str(peer_ni->ibp_nid), active,
2201 conn->ibc_version, status);
2203 LASSERT (!in_interrupt());
2204 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2205 peer_ni->ibp_connecting > 0) ||
2206 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2207 peer_ni->ibp_accepting > 0));
2209 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2210 conn->ibc_connvars = NULL;
2213 /* failed to establish connection */
2214 kiblnd_peer_connect_failed(peer_ni, active, status);
2215 kiblnd_finalise_conn(conn);
2219 /* connection established */
2220 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2222 conn->ibc_last_send = ktime_get();
2223 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2224 kiblnd_peer_alive(peer_ni);
2226 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2227 * peer_ni instance... */
2228 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2229 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2230 peer_ni->ibp_reconnected = 0;
2232 peer_ni->ibp_connecting--;
2234 peer_ni->ibp_accepting--;
2236 if (peer_ni->ibp_version == 0) {
2237 peer_ni->ibp_version = conn->ibc_version;
2238 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2241 if (peer_ni->ibp_version != conn->ibc_version ||
2242 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2243 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2244 conn->ibc_incarnation);
2245 peer_ni->ibp_version = conn->ibc_version;
2246 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2249 /* grab pending txs while I have the lock */
2250 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2252 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2253 conn->ibc_comms_error != 0) { /* error has happened already */
2255 /* start to shut down connection */
2256 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2257 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2259 kiblnd_txlist_done(&txs, -ECONNABORTED,
2260 LNET_MSG_STATUS_LOCAL_ERROR);
2265 /* +1 ref for myself, this connection is visible to other threads
2266 * now, refcount of peer:ibp_conns can be released by connection
2267 * close from either a different thread, or the calling of
2268 * kiblnd_check_sends_locked() below. See bz21911 for details.
2270 kiblnd_conn_addref(conn);
2271 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2273 /* Schedule blocked txs
2274 * Note: if we are running with conns_per_peer > 1, these blocked
2275 * txs will all get scheduled to the first connection which gets
2276 * scheduled. We won't be using round robin on this first batch.
2278 spin_lock(&conn->ibc_lock);
2279 while (!list_empty(&txs)) {
2280 tx = list_entry(txs.next, struct kib_tx, tx_list);
2281 list_del(&tx->tx_list);
2283 kiblnd_queue_tx_locked(tx, conn);
2285 kiblnd_check_sends_locked(conn);
2286 spin_unlock(&conn->ibc_lock);
2288 /* schedule blocked rxs */
2289 kiblnd_handle_early_rxs(conn);
2290 kiblnd_conn_decref(conn);
2294 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2298 rc = rdma_reject(cmid, rej, sizeof(*rej));
2301 CWARN("Error %d sending reject\n", rc);
2305 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2307 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2308 struct kib_msg *reqmsg = priv;
2309 struct kib_msg *ackmsg;
2310 struct kib_dev *ibdev;
2311 struct kib_peer_ni *peer_ni;
2312 struct kib_peer_ni *peer2;
2313 struct kib_conn *conn;
2314 struct lnet_ni *ni = NULL;
2315 struct kib_net *net = NULL;
2317 struct rdma_conn_param cp;
2319 int version = IBLND_MSG_VERSION;
2320 unsigned long flags;
2322 struct sockaddr_in *peer_addr;
2323 LASSERT (!in_interrupt());
2325 /* cmid inherits 'context' from the corresponding listener id */
2326 ibdev = cmid->context;
2329 memset(&rej, 0, sizeof(rej));
2330 rej.ibr_magic = IBLND_MSG_MAGIC;
2331 rej.ibr_why = IBLND_REJECT_FATAL;
2332 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2334 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2335 if (*kiblnd_tunables.kib_require_priv_port &&
2336 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2337 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2338 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2339 &ip, ntohs(peer_addr->sin_port));
2343 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2344 CERROR("Short connection request\n");
2348 /* Future protocol version compatibility support! If the
2349 * o2iblnd-specific protocol changes, or when LNET unifies
2350 * protocols over all LNDs, the initial connection will
2351 * negotiate a protocol version. I trap this here to avoid
2352 * console errors; the reject tells the peer_ni which protocol I
2354 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2355 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2357 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2358 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2359 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2361 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2362 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2363 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2366 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2368 CERROR("Can't parse connection request: %d\n", rc);
2372 nid = reqmsg->ibm_srcnid;
2373 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2376 net = (struct kib_net *)ni->ni_data;
2377 rej.ibr_incarnation = net->ibn_incarnation;
2380 if (ni == NULL || /* no matching net */
2381 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2382 net->ibn_dev != ibdev) { /* wrong device */
2383 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2384 "bad dst nid %s\n", libcfs_nid2str(nid),
2385 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2386 ibdev->ibd_ifname, ibdev->ibd_nnets,
2388 libcfs_nid2str(reqmsg->ibm_dstnid));
2393 /* check time stamp as soon as possible */
2394 if (reqmsg->ibm_dststamp != 0 &&
2395 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2396 CWARN("Stale connection request\n");
2397 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2401 /* I can accept peer_ni's version */
2402 version = reqmsg->ibm_version;
2404 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2405 CERROR("Unexpected connreq msg type: %x from %s\n",
2406 reqmsg->ibm_type, libcfs_nid2str(nid));
2410 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2411 kiblnd_msg_queue_size(version, ni)) {
2412 CERROR("Can't accept conn from %s, queue depth too large: "
2413 " %d (<=%d wanted)\n",
2414 libcfs_nid2str(nid),
2415 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2416 kiblnd_msg_queue_size(version, ni));
2418 if (version == IBLND_MSG_VERSION)
2419 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2424 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2425 IBLND_MAX_RDMA_FRAGS) {
2426 CWARN("Can't accept conn from %s (version %x): "
2427 "max_frags %d too large (%d wanted)\n",
2428 libcfs_nid2str(nid), version,
2429 reqmsg->ibm_u.connparams.ibcp_max_frags,
2430 IBLND_MAX_RDMA_FRAGS);
2432 if (version >= IBLND_MSG_VERSION)
2433 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2436 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2437 IBLND_MAX_RDMA_FRAGS &&
2438 net->ibn_fmr_ps == NULL) {
2439 CWARN("Can't accept conn from %s (version %x): "
2440 "max_frags %d incompatible without FMR pool "
2442 libcfs_nid2str(nid), version,
2443 reqmsg->ibm_u.connparams.ibcp_max_frags,
2444 IBLND_MAX_RDMA_FRAGS);
2446 if (version == IBLND_MSG_VERSION)
2447 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2452 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2453 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2454 libcfs_nid2str(nid),
2455 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2460 /* assume 'nid' is a new peer_ni; create */
2461 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2463 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2464 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2468 /* We have validated the peer's parameters so use those */
2469 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2470 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2472 write_lock_irqsave(g_lock, flags);
2474 peer2 = kiblnd_find_peer_locked(ni, nid);
2475 if (peer2 != NULL) {
2476 if (peer2->ibp_version == 0) {
2477 peer2->ibp_version = version;
2478 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2481 /* not the guy I've talked with */
2482 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2483 peer2->ibp_version != version) {
2484 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2486 if (kiblnd_peer_active(peer2)) {
2487 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2488 peer2->ibp_version = version;
2490 write_unlock_irqrestore(g_lock, flags);
2492 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2493 libcfs_nid2str(nid), peer2->ibp_version, version,
2494 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2496 kiblnd_peer_decref(peer_ni);
2497 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2501 /* Tie-break connection race in favour of the higher NID.
2502 * If we keep running into a race condition multiple times,
2503 * we have to assume that the connection attempt with the
2504 * higher NID is stuck in a connecting state and will never
2505 * recover. As such, we pass through this if-block and let
2506 * the lower NID connection win so we can move forward.
2508 if (peer2->ibp_connecting != 0 &&
2509 nid < ni->ni_nid && peer2->ibp_races <
2510 MAX_CONN_RACES_BEFORE_ABORT) {
2512 write_unlock_irqrestore(g_lock, flags);
2514 CDEBUG(D_NET, "Conn race %s\n",
2515 libcfs_nid2str(peer2->ibp_nid));
2517 kiblnd_peer_decref(peer_ni);
2518 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2521 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2522 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2523 libcfs_nid2str(peer2->ibp_nid),
2524 MAX_CONN_RACES_BEFORE_ABORT);
2526 * passive connection is allowed even this peer_ni is waiting for
2529 peer2->ibp_reconnecting = 0;
2530 peer2->ibp_races = 0;
2531 peer2->ibp_accepting++;
2532 kiblnd_peer_addref(peer2);
2534 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2535 * so copy validated parameters since we now know what the
2536 * peer_ni's limits are */
2537 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2538 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2540 write_unlock_irqrestore(g_lock, flags);
2541 kiblnd_peer_decref(peer_ni);
2544 /* Brand new peer_ni */
2545 LASSERT (peer_ni->ibp_accepting == 0);
2546 LASSERT (peer_ni->ibp_version == 0 &&
2547 peer_ni->ibp_incarnation == 0);
2549 peer_ni->ibp_accepting = 1;
2550 peer_ni->ibp_version = version;
2551 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2553 /* I have a ref on ni that prevents it being shutdown */
2554 LASSERT (net->ibn_shutdown == 0);
2556 kiblnd_peer_addref(peer_ni);
2557 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2559 write_unlock_irqrestore(g_lock, flags);
2562 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2564 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2565 kiblnd_peer_decref(peer_ni);
2566 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2570 /* conn now "owns" cmid, so I return success from here on to ensure the
2571 * CM callback doesn't destroy cmid. */
2572 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2573 conn->ibc_credits = conn->ibc_queue_depth;
2574 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2575 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2576 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2578 ackmsg = &conn->ibc_connvars->cv_msg;
2579 memset(ackmsg, 0, sizeof(*ackmsg));
2581 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2582 sizeof(ackmsg->ibm_u.connparams));
2583 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2584 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2585 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2587 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2589 memset(&cp, 0, sizeof(cp));
2590 cp.private_data = ackmsg;
2591 cp.private_data_len = ackmsg->ibm_nob;
2592 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2593 cp.initiator_depth = 0;
2594 cp.flow_control = 1;
2595 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2596 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2598 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2600 rc = rdma_accept(cmid, &cp);
2602 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2603 rej.ibr_version = version;
2604 rej.ibr_why = IBLND_REJECT_FATAL;
2606 kiblnd_reject(cmid, &rej);
2607 kiblnd_connreq_done(conn, rc);
2608 kiblnd_conn_decref(conn);
2616 rej.ibr_cp.ibcp_queue_depth =
2617 kiblnd_msg_queue_size(version, ni);
2618 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2622 rej.ibr_version = version;
2623 kiblnd_reject(cmid, &rej);
2625 return -ECONNREFUSED;
2629 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2630 u64 incarnation, int why, struct kib_connparams *cp)
2632 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2633 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2635 int msg_size = IBLND_MSG_SIZE;
2639 unsigned long flags;
2641 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2642 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2645 msg_size = cp->ibcp_max_msg_size;
2646 frag_num = cp->ibcp_max_frags;
2647 queue_dep = cp->ibcp_queue_depth;
2650 write_lock_irqsave(glock, flags);
2651 /* retry connection if it's still needed and no other connection
2652 * attempts (active or passive) are in progress
2653 * NB: reconnect is still needed even when ibp_tx_queue is
2654 * empty if ibp_version != version because reconnect may be
2657 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2658 peer_ni->ibp_version != version) &&
2659 peer_ni->ibp_connecting &&
2660 peer_ni->ibp_accepting == 0;
2671 case IBLND_REJECT_RDMA_FRAGS: {
2672 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2675 reason = "can't negotiate max frags";
2678 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2679 #ifdef HAVE_IB_GET_DMA_MR
2681 * This check only makes sense if the kernel supports global
2682 * memory registration. Otherwise, map_on_demand will never == 0
2684 if (!tunables->lnd_map_on_demand) {
2685 reason = "map_on_demand must be enabled";
2689 if (conn->ibc_max_frags <= frag_num) {
2690 reason = "unsupported max frags";
2694 peer_ni->ibp_max_frags = frag_num;
2695 reason = "rdma fragments";
2698 case IBLND_REJECT_MSG_QUEUE_SIZE:
2700 reason = "can't negotiate queue depth";
2703 if (conn->ibc_queue_depth <= queue_dep) {
2704 reason = "unsupported queue depth";
2708 peer_ni->ibp_queue_depth = queue_dep;
2709 reason = "queue depth";
2712 case IBLND_REJECT_CONN_STALE:
2716 case IBLND_REJECT_CONN_RACE:
2717 reason = "conn race";
2720 case IBLND_REJECT_CONN_UNCOMPAT:
2721 reason = "version negotiation";
2724 case IBLND_REJECT_INVALID_SRV_ID:
2725 reason = "invalid service id";
2729 conn->ibc_reconnect = 1;
2730 peer_ni->ibp_reconnecting++;
2731 peer_ni->ibp_version = version;
2732 if (incarnation != 0)
2733 peer_ni->ibp_incarnation = incarnation;
2735 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2737 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2738 libcfs_nid2str(peer_ni->ibp_nid),
2739 reconnect ? "reconnect" : "don't reconnect",
2740 reason, IBLND_MSG_VERSION, version, msg_size,
2741 conn->ibc_queue_depth, queue_dep,
2742 conn->ibc_max_frags, frag_num);
2744 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2745 * while destroying the zombie
2750 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2752 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2754 LASSERT (!in_interrupt());
2755 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2758 case IB_CM_REJ_STALE_CONN:
2759 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2760 IBLND_REJECT_CONN_STALE, NULL);
2763 case IB_CM_REJ_INVALID_SERVICE_ID:
2764 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2765 IBLND_REJECT_INVALID_SRV_ID, NULL);
2766 CNETERR("%s rejected: no listener at %d\n",
2767 libcfs_nid2str(peer_ni->ibp_nid),
2768 *kiblnd_tunables.kib_service);
2771 case IB_CM_REJ_CONSUMER_DEFINED:
2772 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2773 struct kib_rej *rej = priv;
2774 struct kib_connparams *cp = NULL;
2776 __u64 incarnation = -1;
2778 /* NB. default incarnation is -1 because:
2779 * a) V1 will ignore dst incarnation in connreq.
2780 * b) V2 will provide incarnation while rejecting me,
2781 * -1 will be overwrote.
2783 * if I try to connect to a V1 peer_ni with V2 protocol,
2784 * it rejected me then upgrade to V2, I have no idea
2785 * about the upgrading and try to reconnect with V1,
2786 * in this case upgraded V2 can find out I'm trying to
2787 * talk to the old guy and reject me(incarnation is -1).
2790 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2791 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2792 __swab32s(&rej->ibr_magic);
2793 __swab16s(&rej->ibr_version);
2797 if (priv_nob >= sizeof(struct kib_rej) &&
2798 rej->ibr_version > IBLND_MSG_VERSION_1) {
2799 /* priv_nob is always 148 in current version
2800 * of OFED, so we still need to check version.
2801 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2805 __swab64s(&rej->ibr_incarnation);
2806 __swab16s(&cp->ibcp_queue_depth);
2807 __swab16s(&cp->ibcp_max_frags);
2808 __swab32s(&cp->ibcp_max_msg_size);
2811 incarnation = rej->ibr_incarnation;
2814 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2815 rej->ibr_magic != LNET_PROTO_MAGIC) {
2816 CERROR("%s rejected: consumer defined fatal error\n",
2817 libcfs_nid2str(peer_ni->ibp_nid));
2821 if (rej->ibr_version != IBLND_MSG_VERSION &&
2822 rej->ibr_version != IBLND_MSG_VERSION_1) {
2823 CERROR("%s rejected: o2iblnd version %x error\n",
2824 libcfs_nid2str(peer_ni->ibp_nid),
2829 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2830 rej->ibr_version == IBLND_MSG_VERSION_1) {
2831 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2832 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2834 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2835 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2838 switch (rej->ibr_why) {
2839 case IBLND_REJECT_CONN_RACE:
2840 case IBLND_REJECT_CONN_STALE:
2841 case IBLND_REJECT_CONN_UNCOMPAT:
2842 case IBLND_REJECT_MSG_QUEUE_SIZE:
2843 case IBLND_REJECT_RDMA_FRAGS:
2844 kiblnd_check_reconnect(conn, rej->ibr_version,
2845 incarnation, rej->ibr_why, cp);
2848 case IBLND_REJECT_NO_RESOURCES:
2849 CERROR("%s rejected: o2iblnd no resources\n",
2850 libcfs_nid2str(peer_ni->ibp_nid));
2853 case IBLND_REJECT_FATAL:
2854 CERROR("%s rejected: o2iblnd fatal error\n",
2855 libcfs_nid2str(peer_ni->ibp_nid));
2859 CERROR("%s rejected: o2iblnd reason %d\n",
2860 libcfs_nid2str(peer_ni->ibp_nid),
2868 CNETERR("%s rejected: reason %d, size %d\n",
2869 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2873 kiblnd_connreq_done(conn, -ECONNREFUSED);
2877 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2879 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2880 struct lnet_ni *ni = peer_ni->ibp_ni;
2881 struct kib_net *net = ni->ni_data;
2882 struct kib_msg *msg = priv;
2883 int ver = conn->ibc_version;
2884 int rc = kiblnd_unpack_msg(msg, priv_nob);
2885 unsigned long flags;
2887 LASSERT (net != NULL);
2890 CERROR("Can't unpack connack from %s: %d\n",
2891 libcfs_nid2str(peer_ni->ibp_nid), rc);
2895 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2896 CERROR("Unexpected message %d from %s\n",
2897 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2902 if (ver != msg->ibm_version) {
2903 CERROR("%s replied version %x is different with "
2904 "requested version %x\n",
2905 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2910 if (msg->ibm_u.connparams.ibcp_queue_depth >
2911 conn->ibc_queue_depth) {
2912 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2913 libcfs_nid2str(peer_ni->ibp_nid),
2914 msg->ibm_u.connparams.ibcp_queue_depth,
2915 conn->ibc_queue_depth);
2920 if (msg->ibm_u.connparams.ibcp_max_frags >
2921 conn->ibc_max_frags) {
2922 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2923 libcfs_nid2str(peer_ni->ibp_nid),
2924 msg->ibm_u.connparams.ibcp_max_frags,
2925 conn->ibc_max_frags);
2930 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2931 CERROR("%s max message size %d too big (%d max)\n",
2932 libcfs_nid2str(peer_ni->ibp_nid),
2933 msg->ibm_u.connparams.ibcp_max_msg_size,
2939 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2940 if (msg->ibm_dstnid == ni->ni_nid &&
2941 msg->ibm_dststamp == net->ibn_incarnation)
2945 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2948 CERROR("Bad connection reply from %s, rc = %d, "
2949 "version: %x max_frags: %d\n",
2950 libcfs_nid2str(peer_ni->ibp_nid), rc,
2951 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2955 conn->ibc_incarnation = msg->ibm_srcstamp;
2956 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2957 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2958 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2959 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2960 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2961 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2963 kiblnd_connreq_done(conn, 0);
2967 /* NB My QP has already established itself, so I handle anything going
2968 * wrong here by setting ibc_comms_error.
2969 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2970 * immediately tears it down. */
2973 conn->ibc_comms_error = rc;
2974 kiblnd_connreq_done(conn, 0);
2978 kiblnd_active_connect(struct rdma_cm_id *cmid)
2980 struct kib_peer_ni *peer_ni = cmid->context;
2981 struct kib_conn *conn;
2982 struct kib_msg *msg;
2983 struct rdma_conn_param cp;
2986 unsigned long flags;
2989 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2991 incarnation = peer_ni->ibp_incarnation;
2992 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
2993 peer_ni->ibp_version;
2995 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2997 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3000 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3001 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3005 /* conn "owns" cmid now, so I return success from here on to ensure the
3006 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3009 msg = &conn->ibc_connvars->cv_msg;
3011 memset(msg, 0, sizeof(*msg));
3012 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3013 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3014 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3015 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3017 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3018 0, peer_ni->ibp_nid, incarnation);
3020 memset(&cp, 0, sizeof(cp));
3021 cp.private_data = msg;
3022 cp.private_data_len = msg->ibm_nob;
3023 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3024 cp.initiator_depth = 0;
3025 cp.flow_control = 1;
3026 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3027 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3029 LASSERT(cmid->context == (void *)conn);
3030 LASSERT(conn->ibc_cmid == cmid);
3032 rc = rdma_connect(cmid, &cp);
3034 CERROR("Can't connect to %s: %d\n",
3035 libcfs_nid2str(peer_ni->ibp_nid), rc);
3036 kiblnd_connreq_done(conn, rc);
3037 kiblnd_conn_decref(conn);
3044 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3046 struct kib_peer_ni *peer_ni;
3047 struct kib_conn *conn;
3050 switch (event->event) {
3052 CERROR("Unexpected event: %d, status: %d\n",
3053 event->event, event->status);
3056 case RDMA_CM_EVENT_CONNECT_REQUEST:
3057 /* destroy cmid on failure */
3058 rc = kiblnd_passive_connect(cmid,
3059 (void *)KIBLND_CONN_PARAM(event),
3060 KIBLND_CONN_PARAM_LEN(event));
3061 CDEBUG(D_NET, "connreq: %d\n", rc);
3064 case RDMA_CM_EVENT_ADDR_ERROR:
3065 peer_ni = cmid->context;
3066 CNETERR("%s: ADDR ERROR %d\n",
3067 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3068 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3069 kiblnd_peer_decref(peer_ni);
3070 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3072 case RDMA_CM_EVENT_ADDR_RESOLVED:
3073 peer_ni = cmid->context;
3075 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3076 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3078 if (event->status != 0) {
3079 CNETERR("Can't resolve address for %s: %d\n",
3080 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3083 rc = rdma_resolve_route(
3084 cmid, kiblnd_timeout() * 1000);
3086 struct kib_net *net = peer_ni->ibp_ni->ni_data;
3087 struct kib_dev *dev = net->ibn_dev;
3089 CDEBUG(D_NET, "%s: connection bound to "\
3091 libcfs_nid2str(peer_ni->ibp_nid),
3093 &dev->ibd_ifip, cmid->device->name);
3098 /* Can't initiate route resolution */
3099 CERROR("Can't resolve route for %s: %d\n",
3100 libcfs_nid2str(peer_ni->ibp_nid), rc);
3102 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3103 kiblnd_peer_decref(peer_ni);
3104 return rc; /* rc != 0 destroys cmid */
3106 case RDMA_CM_EVENT_ROUTE_ERROR:
3107 peer_ni = cmid->context;
3108 CNETERR("%s: ROUTE ERROR %d\n",
3109 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3110 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3111 kiblnd_peer_decref(peer_ni);
3112 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3114 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3115 peer_ni = cmid->context;
3116 CDEBUG(D_NET,"%s Route resolved: %d\n",
3117 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3119 if (event->status == 0)
3120 return kiblnd_active_connect(cmid);
3122 CNETERR("Can't resolve route for %s: %d\n",
3123 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3124 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3125 kiblnd_peer_decref(peer_ni);
3126 return event->status; /* rc != 0 destroys cmid */
3128 case RDMA_CM_EVENT_UNREACHABLE:
3129 conn = cmid->context;
3130 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3131 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3132 CNETERR("%s: UNREACHABLE %d\n",
3133 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3134 kiblnd_connreq_done(conn, -ENETDOWN);
3135 kiblnd_conn_decref(conn);
3138 case RDMA_CM_EVENT_CONNECT_ERROR:
3139 conn = cmid->context;
3140 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3141 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3142 CNETERR("%s: CONNECT ERROR %d\n",
3143 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3144 kiblnd_connreq_done(conn, -ENOTCONN);
3145 kiblnd_conn_decref(conn);
3148 case RDMA_CM_EVENT_REJECTED:
3149 conn = cmid->context;
3150 switch (conn->ibc_state) {
3154 case IBLND_CONN_PASSIVE_WAIT:
3155 CERROR ("%s: REJECTED %d\n",
3156 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3158 kiblnd_connreq_done(conn, -ECONNRESET);
3161 case IBLND_CONN_ACTIVE_CONNECT:
3162 kiblnd_rejected(conn, event->status,
3163 (void *)KIBLND_CONN_PARAM(event),
3164 KIBLND_CONN_PARAM_LEN(event));
3167 kiblnd_conn_decref(conn);
3170 case RDMA_CM_EVENT_ESTABLISHED:
3171 conn = cmid->context;
3172 switch (conn->ibc_state) {
3176 case IBLND_CONN_PASSIVE_WAIT:
3177 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3178 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3179 kiblnd_connreq_done(conn, 0);
3182 case IBLND_CONN_ACTIVE_CONNECT:
3183 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3184 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3185 kiblnd_check_connreply(conn,
3186 (void *)KIBLND_CONN_PARAM(event),
3187 KIBLND_CONN_PARAM_LEN(event));
3190 /* net keeps its ref on conn! */
3193 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3194 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3197 case RDMA_CM_EVENT_DISCONNECTED:
3198 conn = cmid->context;
3199 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3200 CERROR("%s DISCONNECTED\n",
3201 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3202 kiblnd_connreq_done(conn, -ECONNRESET);
3204 kiblnd_close_conn(conn, 0);
3206 kiblnd_conn_decref(conn);
3207 cmid->context = NULL;
3210 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3211 LCONSOLE_ERROR_MSG(0x131,
3212 "Received notification of device removal\n"
3213 "Please shutdown LNET to allow this to proceed\n");
3214 /* Can't remove network from underneath LNET for now, so I have
3218 case RDMA_CM_EVENT_ADDR_CHANGE:
3219 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3225 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3228 struct list_head *ttmp;
3230 list_for_each(ttmp, txs) {
3231 tx = list_entry(ttmp, struct kib_tx, tx_list);
3233 if (txs != &conn->ibc_active_txs) {
3234 LASSERT(tx->tx_queued);
3236 LASSERT(!tx->tx_queued);
3237 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3240 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3241 CERROR("Timed out tx: %s, %lld seconds\n",
3242 kiblnd_queue2str(conn, txs),
3243 ktime_ms_delta(ktime_get(),
3244 tx->tx_deadline) / MSEC_PER_SEC);
3253 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3255 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3256 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3257 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3258 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3259 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3263 kiblnd_check_conns (int idx)
3266 LIST_HEAD(checksends);
3267 LIST_HEAD(timedout_txs);
3268 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3269 struct list_head *ptmp;
3270 struct kib_peer_ni *peer_ni;
3271 struct kib_conn *conn;
3272 struct kib_tx *tx, *tx_tmp;
3273 struct list_head *ctmp;
3274 unsigned long flags;
3276 /* NB. We expect to have a look at all the peers and not find any
3277 * RDMAs to time out, so we just use a shared lock while we
3279 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3281 list_for_each(ptmp, peers) {
3282 peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
3284 /* Check tx_deadline */
3285 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3286 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3287 CWARN("Timed out tx for %s: %lld seconds\n",
3288 libcfs_nid2str(peer_ni->ibp_nid),
3289 ktime_ms_delta(ktime_get(),
3290 tx->tx_deadline) / MSEC_PER_SEC);
3291 list_move(&tx->tx_list, &timedout_txs);
3295 list_for_each(ctmp, &peer_ni->ibp_conns) {
3299 conn = list_entry(ctmp, struct kib_conn, ibc_list);
3301 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3303 spin_lock(&conn->ibc_lock);
3305 sendnoop = kiblnd_need_noop(conn);
3306 timedout = kiblnd_conn_timed_out_locked(conn);
3307 if (!sendnoop && !timedout) {
3308 spin_unlock(&conn->ibc_lock);
3313 CERROR("Timed out RDMA with %s (%lld): "
3314 "c: %u, oc: %u, rc: %u\n",
3315 libcfs_nid2str(peer_ni->ibp_nid),
3316 ktime_get_seconds() - peer_ni->ibp_last_alive,
3318 conn->ibc_outstanding_credits,
3319 conn->ibc_reserved_credits);
3320 list_add(&conn->ibc_connd_list, &closes);
3322 list_add(&conn->ibc_connd_list, &checksends);
3324 /* +ref for 'closes' or 'checksends' */
3325 kiblnd_conn_addref(conn);
3327 spin_unlock(&conn->ibc_lock);
3331 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3333 if (!list_empty(&timedout_txs))
3334 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
3335 LNET_MSG_STATUS_LOCAL_TIMEOUT);
3337 /* Handle timeout by closing the whole
3338 * connection. We can only be sure RDMA activity
3339 * has ceased once the QP has been modified. */
3340 while (!list_empty(&closes)) {
3341 conn = list_entry(closes.next,
3342 struct kib_conn, ibc_connd_list);
3343 list_del(&conn->ibc_connd_list);
3344 kiblnd_close_conn(conn, -ETIMEDOUT);
3345 kiblnd_conn_decref(conn);
3348 /* In case we have enough credits to return via a
3349 * NOOP, but there were no non-blocking tx descs
3350 * free to do it last time... */
3351 while (!list_empty(&checksends)) {
3352 conn = list_entry(checksends.next,
3353 struct kib_conn, ibc_connd_list);
3354 list_del(&conn->ibc_connd_list);
3356 spin_lock(&conn->ibc_lock);
3357 kiblnd_check_sends_locked(conn);
3358 spin_unlock(&conn->ibc_lock);
3360 kiblnd_conn_decref(conn);
3365 kiblnd_disconnect_conn(struct kib_conn *conn)
3367 LASSERT (!in_interrupt());
3368 LASSERT (current == kiblnd_data.kib_connd);
3369 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3371 rdma_disconnect(conn->ibc_cmid);
3372 kiblnd_finalise_conn(conn);
3374 kiblnd_peer_notify(conn->ibc_peer);
3378 * High-water for reconnection to the same peer_ni, reconnection attempt should
3379 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3381 #define KIB_RECONN_HIGH_RACE 10
3383 * Allow connd to take a break and handle other things after consecutive
3384 * reconnection attemps.
3386 #define KIB_RECONN_BREAK 100
3389 kiblnd_connd (void *arg)
3391 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3392 wait_queue_entry_t wait;
3393 unsigned long flags;
3394 struct kib_conn *conn;
3399 unsigned long deadline = jiffies;
3401 init_waitqueue_entry(&wait, current);
3402 kiblnd_data.kib_connd = current;
3404 spin_lock_irqsave(lock, flags);
3406 while (!kiblnd_data.kib_shutdown) {
3411 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3412 struct kib_peer_ni *peer_ni = NULL;
3414 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3415 struct kib_conn, ibc_list);
3416 list_del(&conn->ibc_list);
3417 if (conn->ibc_reconnect) {
3418 peer_ni = conn->ibc_peer;
3419 kiblnd_peer_addref(peer_ni);
3422 spin_unlock_irqrestore(lock, flags);
3425 kiblnd_destroy_conn(conn);
3427 spin_lock_irqsave(lock, flags);
3429 LIBCFS_FREE(conn, sizeof(*conn));
3433 conn->ibc_peer = peer_ni;
3434 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3435 list_add_tail(&conn->ibc_list,
3436 &kiblnd_data.kib_reconn_list);
3438 list_add_tail(&conn->ibc_list,
3439 &kiblnd_data.kib_reconn_wait);
3442 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3443 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3444 struct kib_conn, ibc_list);
3445 list_del(&conn->ibc_list);
3447 spin_unlock_irqrestore(lock, flags);
3450 kiblnd_disconnect_conn(conn);
3451 kiblnd_conn_decref(conn);
3453 spin_lock_irqsave(lock, flags);
3456 while (reconn < KIB_RECONN_BREAK) {
3457 if (kiblnd_data.kib_reconn_sec !=
3458 ktime_get_real_seconds()) {
3459 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3460 list_splice_init(&kiblnd_data.kib_reconn_wait,
3461 &kiblnd_data.kib_reconn_list);
3464 if (list_empty(&kiblnd_data.kib_reconn_list))
3467 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3468 struct kib_conn, ibc_list);
3469 list_del(&conn->ibc_list);
3471 spin_unlock_irqrestore(lock, flags);
3474 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3475 kiblnd_peer_decref(conn->ibc_peer);
3476 LIBCFS_FREE(conn, sizeof(*conn));
3478 spin_lock_irqsave(lock, flags);
3481 /* careful with the jiffy wrap... */
3482 timeout = (int)(deadline - jiffies);
3486 int chunk = kiblnd_data.kib_peer_hash_size;
3487 unsigned int lnd_timeout;
3489 spin_unlock_irqrestore(lock, flags);
3492 /* Time to check for RDMA timeouts on a few more
3493 * peers: I do checks every 'p' seconds on a
3494 * proportion of the peer_ni table and I need to check
3495 * every connection 'n' times within a timeout
3496 * interval, to ensure I detect a timeout on any
3497 * connection within (n+1)/n times the timeout
3500 lnd_timeout = kiblnd_timeout();
3501 if (lnd_timeout > n * p)
3502 chunk = (chunk * n * p) / lnd_timeout;
3506 for (i = 0; i < chunk; i++) {
3507 kiblnd_check_conns(peer_index);
3508 peer_index = (peer_index + 1) %
3509 kiblnd_data.kib_peer_hash_size;
3512 deadline += cfs_time_seconds(p);
3513 spin_lock_irqsave(lock, flags);
3519 /* Nothing to do for 'timeout' */
3520 set_current_state(TASK_INTERRUPTIBLE);
3521 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3522 spin_unlock_irqrestore(lock, flags);
3524 schedule_timeout(timeout);
3526 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3527 spin_lock_irqsave(lock, flags);
3530 spin_unlock_irqrestore(lock, flags);
3532 kiblnd_thread_fini();
3537 kiblnd_qp_event(struct ib_event *event, void *arg)
3539 struct kib_conn *conn = arg;
3541 switch (event->event) {
3542 case IB_EVENT_COMM_EST:
3543 CDEBUG(D_NET, "%s established\n",
3544 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3545 /* We received a packet but connection isn't established
3546 * probably handshake packet was lost, so free to
3547 * force make connection established */
3548 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3551 case IB_EVENT_PORT_ERR:
3552 case IB_EVENT_DEVICE_FATAL:
3553 CERROR("Fatal device error for NI %s\n",
3554 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3555 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
3558 case IB_EVENT_PORT_ACTIVE:
3559 CERROR("Port reactivated for NI %s\n",
3560 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3561 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
3565 CERROR("%s: Async QP event type %d\n",
3566 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3572 kiblnd_complete (struct ib_wc *wc)
3574 switch (kiblnd_wreqid2type(wc->wr_id)) {
3579 if (wc->status != IB_WC_SUCCESS &&
3580 wc->status != IB_WC_WR_FLUSH_ERR)
3581 CNETERR("FastReg failed: %d\n", wc->status);
3584 case IBLND_WID_RDMA:
3585 /* We only get RDMA completion notification if it fails. All
3586 * subsequent work items, including the final SEND will fail
3587 * too. However we can't print out any more info about the
3588 * failing RDMA because 'tx' might be back on the idle list or
3589 * even reused already if we didn't manage to post all our work
3591 CNETERR("RDMA (tx: %p) failed: %d\n",
3592 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3596 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3600 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3607 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3609 /* NB I'm not allowed to schedule this conn once its refcount has
3610 * reached 0. Since fundamentally I'm racing with scheduler threads
3611 * consuming my CQ I could be called after all completions have
3612 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3613 * and this CQ is about to be destroyed so I NOOP. */
3614 struct kib_conn *conn = arg;
3615 struct kib_sched_info *sched = conn->ibc_sched;
3616 unsigned long flags;
3618 LASSERT(cq == conn->ibc_cq);
3620 spin_lock_irqsave(&sched->ibs_lock, flags);
3622 conn->ibc_ready = 1;
3624 if (!conn->ibc_scheduled &&
3625 (conn->ibc_nrx > 0 ||
3626 conn->ibc_nsends_posted > 0)) {
3627 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3628 conn->ibc_scheduled = 1;
3629 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3631 if (waitqueue_active(&sched->ibs_waitq))
3632 wake_up(&sched->ibs_waitq);
3635 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3639 kiblnd_cq_event(struct ib_event *event, void *arg)
3641 struct kib_conn *conn = arg;
3643 CERROR("%s: async CQ event type %d\n",
3644 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3648 kiblnd_scheduler(void *arg)
3650 long id = (long)arg;
3651 struct kib_sched_info *sched;
3652 struct kib_conn *conn;
3653 wait_queue_entry_t wait;
3654 unsigned long flags;
3660 init_waitqueue_entry(&wait, current);
3662 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3664 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3666 CWARN("Unable to bind on CPU partition %d, please verify "
3667 "whether all CPUs are healthy and reload modules if "
3668 "necessary, otherwise your system might under risk of "
3669 "low performance\n", sched->ibs_cpt);
3672 spin_lock_irqsave(&sched->ibs_lock, flags);
3674 while (!kiblnd_data.kib_shutdown) {
3675 if (busy_loops++ >= IBLND_RESCHED) {
3676 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3681 spin_lock_irqsave(&sched->ibs_lock, flags);
3686 if (!list_empty(&sched->ibs_conns)) {
3687 conn = list_entry(sched->ibs_conns.next,
3688 struct kib_conn, ibc_sched_list);
3689 /* take over kib_sched_conns' ref on conn... */
3690 LASSERT(conn->ibc_scheduled);
3691 list_del(&conn->ibc_sched_list);
3692 conn->ibc_ready = 0;
3694 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3696 wc.wr_id = IBLND_WID_INVAL;
3698 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3700 rc = ib_req_notify_cq(conn->ibc_cq,
3703 CWARN("%s: ib_req_notify_cq failed: %d, "
3704 "closing connection\n",
3705 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3706 kiblnd_close_conn(conn, -EIO);
3707 kiblnd_conn_decref(conn);
3708 spin_lock_irqsave(&sched->ibs_lock,
3713 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3716 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3718 "ib_poll_cq (rc: %d) returned invalid "
3719 "wr_id, opcode %d, status: %d, "
3720 "vendor_err: %d, conn: %s status: %d\n"
3721 "please upgrade firmware and OFED or "
3722 "contact vendor.\n", rc,
3723 wc.opcode, wc.status, wc.vendor_err,
3724 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3730 CWARN("%s: ib_poll_cq failed: %d, "
3731 "closing connection\n",
3732 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3734 kiblnd_close_conn(conn, -EIO);
3735 kiblnd_conn_decref(conn);
3736 spin_lock_irqsave(&sched->ibs_lock, flags);
3740 spin_lock_irqsave(&sched->ibs_lock, flags);
3742 if (rc != 0 || conn->ibc_ready) {
3743 /* There may be another completion waiting; get
3744 * another scheduler to check while I handle
3746 /* +1 ref for sched_conns */
3747 kiblnd_conn_addref(conn);
3748 list_add_tail(&conn->ibc_sched_list,
3750 if (waitqueue_active(&sched->ibs_waitq))
3751 wake_up(&sched->ibs_waitq);
3753 conn->ibc_scheduled = 0;
3757 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3758 kiblnd_complete(&wc);
3760 spin_lock_irqsave(&sched->ibs_lock, flags);
3763 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3770 set_current_state(TASK_INTERRUPTIBLE);
3771 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3772 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3777 remove_wait_queue(&sched->ibs_waitq, &wait);
3778 set_current_state(TASK_RUNNING);
3779 spin_lock_irqsave(&sched->ibs_lock, flags);
3782 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3784 kiblnd_thread_fini();
3789 kiblnd_failover_thread(void *arg)
3791 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3792 struct kib_dev *dev;
3793 struct net *ns = arg;
3794 wait_queue_entry_t wait;
3795 unsigned long flags;
3798 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3800 init_waitqueue_entry(&wait, current);
3801 write_lock_irqsave(glock, flags);
3803 while (!kiblnd_data.kib_shutdown) {
3804 int do_failover = 0;
3807 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3809 if (ktime_get_seconds() < dev->ibd_next_failover)
3816 list_del_init(&dev->ibd_fail_list);
3817 dev->ibd_failover = 1;
3818 write_unlock_irqrestore(glock, flags);
3820 rc = kiblnd_dev_failover(dev, ns);
3822 write_lock_irqsave(glock, flags);
3824 LASSERT (dev->ibd_failover);
3825 dev->ibd_failover = 0;
3826 if (rc >= 0) { /* Device is OK or failover succeed */
3827 dev->ibd_next_failover = ktime_get_seconds() + 3;
3831 /* failed to failover, retry later */
3832 dev->ibd_next_failover = ktime_get_seconds() +
3833 min(dev->ibd_failed_failover, 10);
3834 if (kiblnd_dev_can_failover(dev)) {
3835 list_add_tail(&dev->ibd_fail_list,
3836 &kiblnd_data.kib_failed_devs);
3842 /* long sleep if no more pending failover */
3843 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3845 set_current_state(TASK_INTERRUPTIBLE);
3846 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3847 write_unlock_irqrestore(glock, flags);
3849 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3850 cfs_time_seconds(1));
3851 set_current_state(TASK_RUNNING);
3852 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3853 write_lock_irqsave(glock, flags);
3855 if (!long_sleep || rc != 0)
3858 /* have a long sleep, routine check all active devices,
3859 * we need checking like this because if there is not active
3860 * connection on the dev and no SEND from local, we may listen
3861 * on wrong HCA for ever while there is a bonding failover */
3862 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3863 if (kiblnd_dev_can_failover(dev)) {
3864 list_add_tail(&dev->ibd_fail_list,
3865 &kiblnd_data.kib_failed_devs);
3870 write_unlock_irqrestore(glock, flags);
3872 kiblnd_thread_fini();