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_iov(struct lnet_ni *ni, struct kib_tx *tx,
734 struct kib_rdma_desc *rd, unsigned int niov,
735 struct kvec *iov, int offset, int nob)
737 struct kib_net *net = ni->ni_data;
739 struct scatterlist *sg;
743 unsigned int max_niov;
747 LASSERT (net != NULL);
749 while (offset >= iov->iov_len) {
750 offset -= iov->iov_len;
762 vaddr = ((unsigned long)iov->iov_base) + offset;
763 page_offset = vaddr & (PAGE_SIZE - 1);
764 page = lnet_kvaddr_to_page(vaddr);
766 CERROR("Can't find page\n");
770 fragnob = min((int)(iov->iov_len - offset), nob);
771 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
774 * We're allowed to start at a non-aligned page offset in
775 * the first fragment and end at a non-aligned page offset
776 * in the last fragment.
778 if ((fragnob < (int)PAGE_SIZE - page_offset) &&
779 (niov < max_niov) && nob > fragnob) {
780 CDEBUG(D_NET, "fragnob %d < available page %d: with"
781 " remaining %d iovs with %d nob left\n",
782 fragnob, (int)PAGE_SIZE - page_offset, niov,
787 sg_set_page(sg, page, fragnob, page_offset);
790 CERROR("lacking enough sg entries to map tx\n");
794 if (offset + fragnob < iov->iov_len) {
804 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
807 static int kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
808 struct kib_rdma_desc *rd, int nkiov,
809 struct bio_vec *kiov, int offset, int nob)
811 struct kib_net *net = ni->ni_data;
812 struct scatterlist *sg;
816 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
820 LASSERT(net != NULL);
822 while (offset >= kiov->bv_len) {
823 offset -= kiov->bv_len;
835 fragnob = min((int)(kiov->bv_len - offset), nob);
838 * We're allowed to start at a non-aligned page offset in
839 * the first fragment and end at a non-aligned page offset
840 * in the last fragment.
842 if ((fragnob < (int)(kiov->bv_len - offset)) &&
843 nkiov < max_nkiov && nob > fragnob) {
844 CDEBUG(D_NET, "fragnob %d < available page %d: with"
845 " remaining %d kiovs with %d nob left\n",
846 fragnob, (int)(kiov->bv_len - offset),
851 sg_set_page(sg, kiov->bv_page, fragnob,
852 kiov->bv_offset + offset);
855 CERROR("lacking enough sg entries to map tx\n");
865 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
869 kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
870 __must_hold(&conn->ibc_lock)
872 struct kib_msg *msg = tx->tx_msg;
873 struct kib_peer_ni *peer_ni = conn->ibc_peer;
874 struct lnet_ni *ni = peer_ni->ibp_ni;
875 int ver = conn->ibc_version;
879 LASSERT(tx->tx_queued);
880 /* We rely on this for QP sizing */
881 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
882 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
884 LASSERT(credit == 0 || credit == 1);
885 LASSERT(conn->ibc_outstanding_credits >= 0);
886 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
887 LASSERT(conn->ibc_credits >= 0);
888 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
890 if (conn->ibc_nsends_posted ==
891 kiblnd_concurrent_sends(ver, ni)) {
892 /* tx completions outstanding... */
893 CDEBUG(D_NET, "%s: posted enough\n",
894 libcfs_nid2str(peer_ni->ibp_nid));
898 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
899 CDEBUG(D_NET, "%s: no credits\n",
900 libcfs_nid2str(peer_ni->ibp_nid));
904 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
905 conn->ibc_credits == 1 && /* last credit reserved */
906 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
907 CDEBUG(D_NET, "%s: not using last credit\n",
908 libcfs_nid2str(peer_ni->ibp_nid));
912 /* NB don't drop ibc_lock before bumping tx_sending */
913 list_del(&tx->tx_list);
916 if (msg->ibm_type == IBLND_MSG_NOOP &&
917 (!kiblnd_need_noop(conn) || /* redundant NOOP */
918 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
919 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
920 /* OK to drop when posted enough NOOPs, since
921 * kiblnd_check_sends_locked will queue NOOP again when
922 * posted NOOPs complete */
923 spin_unlock(&conn->ibc_lock);
924 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
926 spin_lock(&conn->ibc_lock);
927 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
928 libcfs_nid2str(peer_ni->ibp_nid),
929 conn->ibc_noops_posted);
933 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
934 peer_ni->ibp_nid, conn->ibc_incarnation);
936 conn->ibc_credits -= credit;
937 conn->ibc_outstanding_credits = 0;
938 conn->ibc_nsends_posted++;
939 if (msg->ibm_type == IBLND_MSG_NOOP)
940 conn->ibc_noops_posted++;
942 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
943 * PUT. If so, it was first queued here as a PUT_REQ, sent and
944 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
945 * and then re-queued here. It's (just) possible that
946 * tx_sending is non-zero if we've not done the tx_complete()
947 * from the first send; hence the ++ rather than = below. */
949 list_add(&tx->tx_list, &conn->ibc_active_txs);
951 /* I'm still holding ibc_lock! */
952 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
954 } else if (tx->tx_pool->tpo_pool.po_failed ||
955 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
956 /* close_conn will launch failover */
959 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
960 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
961 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
964 if (!frd->frd_valid) {
965 wr = &frd->frd_inv_wr.wr;
966 wr->next = &frd->frd_fastreg_wr.wr;
968 wr = &frd->frd_fastreg_wr.wr;
970 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
973 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
974 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
975 bad->wr_id, bad->opcode, bad->send_flags,
976 libcfs_nid2str(conn->ibc_peer->ibp_nid));
979 if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
982 #ifdef HAVE_IB_POST_SEND_RECV_CONST
983 rc = ib_post_send(conn->ibc_cmid->qp, wr,
984 (const struct ib_send_wr **)&bad);
986 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
990 conn->ibc_last_send = ktime_get();
995 /* NB credits are transferred in the actual
996 * message, which can only be the last work item */
997 conn->ibc_credits += credit;
998 conn->ibc_outstanding_credits += msg->ibm_credits;
999 conn->ibc_nsends_posted--;
1000 if (msg->ibm_type == IBLND_MSG_NOOP)
1001 conn->ibc_noops_posted--;
1007 done = (tx->tx_sending == 0);
1009 list_del(&tx->tx_list);
1011 spin_unlock(&conn->ibc_lock);
1013 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1014 CERROR("Error %d posting transmit to %s\n",
1015 rc, libcfs_nid2str(peer_ni->ibp_nid));
1017 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
1018 rc, libcfs_nid2str(peer_ni->ibp_nid));
1020 kiblnd_close_conn(conn, rc);
1025 spin_lock(&conn->ibc_lock);
1031 kiblnd_check_sends_locked(struct kib_conn *conn)
1033 int ver = conn->ibc_version;
1034 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
1037 /* Don't send anything until after the connection is established */
1038 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
1039 CDEBUG(D_NET, "%s too soon\n",
1040 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1044 LASSERT(conn->ibc_nsends_posted <=
1045 kiblnd_concurrent_sends(ver, ni));
1046 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
1047 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
1048 LASSERT (conn->ibc_reserved_credits >= 0);
1050 while (conn->ibc_reserved_credits > 0 &&
1051 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
1052 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
1053 struct kib_tx, tx_list);
1054 list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
1055 conn->ibc_reserved_credits--;
1058 if (kiblnd_need_noop(conn)) {
1059 spin_unlock(&conn->ibc_lock);
1061 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1063 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
1065 spin_lock(&conn->ibc_lock);
1067 kiblnd_queue_tx_locked(tx, conn);
1073 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1075 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1076 struct kib_tx, tx_list);
1077 } else if (!list_empty(&conn->ibc_tx_noops)) {
1078 LASSERT (!IBLND_OOB_CAPABLE(ver));
1080 tx = list_entry(conn->ibc_tx_noops.next,
1081 struct kib_tx, tx_list);
1082 } else if (!list_empty(&conn->ibc_tx_queue)) {
1084 tx = list_entry(conn->ibc_tx_queue.next,
1085 struct kib_tx, tx_list);
1089 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1095 kiblnd_tx_complete(struct kib_tx *tx, int status)
1097 int failed = (status != IB_WC_SUCCESS);
1098 struct kib_conn *conn = tx->tx_conn;
1101 LASSERT (tx->tx_sending > 0);
1104 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1105 CNETERR("Tx -> %s cookie %#llx"
1106 " sending %d waiting %d: failed %d\n",
1107 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1108 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1111 kiblnd_close_conn(conn, -EIO);
1113 kiblnd_peer_alive(conn->ibc_peer);
1116 spin_lock(&conn->ibc_lock);
1118 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1119 * gets to free it, which also drops its ref on 'conn'. */
1122 conn->ibc_nsends_posted--;
1123 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1124 conn->ibc_noops_posted--;
1127 tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
1128 tx->tx_waiting = 0; /* don't wait for peer_ni */
1129 tx->tx_status = -EIO;
1132 idle = (tx->tx_sending == 0) && /* This is the final callback */
1133 !tx->tx_waiting && /* Not waiting for peer_ni */
1134 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1136 list_del(&tx->tx_list);
1138 kiblnd_check_sends_locked(conn);
1139 spin_unlock(&conn->ibc_lock);
1146 kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
1149 struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
1150 struct ib_sge *sge = &tx->tx_msgsge;
1151 struct ib_rdma_wr *wrq;
1152 int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
1153 #ifdef HAVE_IB_GET_DMA_MR
1154 struct ib_mr *mr = hdev->ibh_mrs;
1157 LASSERT(tx->tx_nwrq >= 0);
1158 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1159 LASSERT(nob <= IBLND_MSG_SIZE);
1160 #ifdef HAVE_IB_GET_DMA_MR
1161 LASSERT(mr != NULL);
1164 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1166 #ifdef HAVE_IB_GET_DMA_MR
1167 sge->lkey = mr->lkey;
1169 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1171 sge->addr = tx->tx_msgaddr;
1174 wrq = &tx->tx_wrq[tx->tx_nwrq];
1175 memset(wrq, 0, sizeof(*wrq));
1177 wrq->wr.next = NULL;
1178 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1179 wrq->wr.sg_list = sge;
1180 wrq->wr.num_sge = 1;
1181 wrq->wr.opcode = IB_WR_SEND;
1182 wrq->wr.send_flags = IB_SEND_SIGNALED;
1188 kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
1189 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
1191 struct kib_msg *ibmsg = tx->tx_msg;
1192 struct kib_rdma_desc *srcrd = tx->tx_rd;
1193 struct ib_rdma_wr *wrq = NULL;
1201 LASSERT(!in_interrupt());
1202 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1203 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1205 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1206 resid > 0; resid -= sge_nob) {
1209 if (srcidx >= srcrd->rd_nfrags) {
1210 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1215 if (dstidx >= dstrd->rd_nfrags) {
1216 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1221 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1222 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1223 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1224 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1225 conn->ibc_max_frags,
1226 srcidx, srcrd->rd_nfrags,
1227 dstidx, dstrd->rd_nfrags);
1232 sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
1233 kiblnd_rd_frag_size(dstrd, dstidx),
1236 sge = &tx->tx_sge[tx->tx_nsge];
1237 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1238 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1239 sge->length = sge_nob;
1242 wrq = &tx->tx_wrq[tx->tx_nwrq];
1244 wrq->wr.next = &(wrq + 1)->wr;
1245 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1246 wrq->wr.sg_list = sge;
1247 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1248 wrq->wr.send_flags = 0;
1250 #ifdef HAVE_IB_RDMA_WR
1251 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1253 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1256 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1258 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1263 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1264 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1267 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1269 wrq->wr.num_sge = wrq_sge;
1275 if (rc < 0) /* no RDMA if completing with failure */
1276 tx->tx_nwrq = tx->tx_nsge = 0;
1278 ibmsg->ibm_u.completion.ibcm_status = rc;
1279 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1280 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1281 type, sizeof(struct kib_completion_msg));
1287 kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
1289 struct list_head *q;
1292 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1293 LASSERT(!tx->tx_queued); /* not queued for sending already */
1294 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1296 if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
1297 tx->tx_status = -ECONNABORTED;
1299 if (tx->tx_conn != NULL) {
1300 /* PUT_DONE first attached to conn as a PUT_REQ */
1301 LASSERT(tx->tx_conn == conn);
1302 LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1304 kiblnd_conn_decref(conn);
1306 list_add(&tx->tx_list, &conn->ibc_zombie_txs);
1311 timeout_ns = lnet_get_lnd_timeout() * NSEC_PER_SEC;
1313 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1315 if (tx->tx_conn == NULL) {
1316 kiblnd_conn_addref(conn);
1318 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1320 /* PUT_DONE first attached to conn as a PUT_REQ */
1321 LASSERT (tx->tx_conn == conn);
1322 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1325 switch (tx->tx_msg->ibm_type) {
1329 case IBLND_MSG_PUT_REQ:
1330 case IBLND_MSG_GET_REQ:
1331 q = &conn->ibc_tx_queue_rsrvd;
1334 case IBLND_MSG_PUT_NAK:
1335 case IBLND_MSG_PUT_ACK:
1336 case IBLND_MSG_PUT_DONE:
1337 case IBLND_MSG_GET_DONE:
1338 q = &conn->ibc_tx_queue_nocred;
1341 case IBLND_MSG_NOOP:
1342 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1343 q = &conn->ibc_tx_queue_nocred;
1345 q = &conn->ibc_tx_noops;
1348 case IBLND_MSG_IMMEDIATE:
1349 q = &conn->ibc_tx_queue;
1353 list_add_tail(&tx->tx_list, q);
1357 kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
1359 spin_lock(&conn->ibc_lock);
1360 kiblnd_queue_tx_locked(tx, conn);
1361 kiblnd_check_sends_locked(conn);
1362 spin_unlock(&conn->ibc_lock);
1365 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1366 struct sockaddr_in *srcaddr,
1367 struct sockaddr_in *dstaddr,
1370 unsigned short port;
1373 /* allow the port to be reused */
1374 rc = rdma_set_reuseaddr(cmid, 1);
1376 CERROR("Unable to set reuse on cmid: %d\n", rc);
1380 /* look for a free privileged port */
1381 for (port = PROT_SOCK-1; port > 0; port--) {
1382 srcaddr->sin_port = htons(port);
1383 rc = rdma_resolve_addr(cmid,
1384 (struct sockaddr *)srcaddr,
1385 (struct sockaddr *)dstaddr,
1388 CDEBUG(D_NET, "bound to port %hu\n", port);
1390 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1391 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1398 CERROR("Failed to bind to a free privileged port\n");
1403 kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
1405 struct rdma_cm_id *cmid;
1406 struct kib_dev *dev;
1407 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1408 struct sockaddr_in srcaddr;
1409 struct sockaddr_in dstaddr;
1412 LASSERT (net != NULL);
1413 LASSERT (peer_ni->ibp_connecting > 0);
1415 cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
1416 kiblnd_cm_callback, peer_ni,
1417 RDMA_PS_TCP, IB_QPT_RC);
1420 CERROR("Can't create CMID for %s: %ld\n",
1421 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1427 memset(&srcaddr, 0, sizeof(srcaddr));
1428 srcaddr.sin_family = AF_INET;
1429 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1431 memset(&dstaddr, 0, sizeof(dstaddr));
1432 dstaddr.sin_family = AF_INET;
1433 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1434 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1436 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1438 if (*kiblnd_tunables.kib_use_priv_port) {
1439 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1440 lnet_get_lnd_timeout() * 1000);
1442 rc = rdma_resolve_addr(cmid,
1443 (struct sockaddr *)&srcaddr,
1444 (struct sockaddr *)&dstaddr,
1445 lnet_get_lnd_timeout() * 1000);
1448 /* Can't initiate address resolution: */
1449 CERROR("Can't resolve addr for %s: %d\n",
1450 libcfs_nid2str(peer_ni->ibp_nid), rc);
1457 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1458 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1459 rdma_destroy_id(cmid);
1462 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1466 kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
1468 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1469 char *reason = NULL;
1471 unsigned long flags;
1473 write_lock_irqsave(glock, flags);
1474 if (peer_ni->ibp_reconnecting == 0) {
1475 if (peer_ni->ibp_accepting)
1476 reason = "accepting";
1477 else if (peer_ni->ibp_connecting)
1478 reason = "connecting";
1479 else if (!list_empty(&peer_ni->ibp_conns))
1480 reason = "connected";
1481 else /* connected then closed */
1487 if (peer_ni->ibp_accepting)
1488 CNETERR("Detecting race between accepting and reconnecting\n");
1489 peer_ni->ibp_reconnecting--;
1491 if (!kiblnd_peer_active(peer_ni)) {
1492 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1493 reason = "unlinked";
1497 peer_ni->ibp_connecting++;
1498 peer_ni->ibp_reconnected++;
1500 write_unlock_irqrestore(glock, flags);
1502 kiblnd_connect_peer(peer_ni);
1506 write_unlock_irqrestore(glock, flags);
1508 CWARN("Abort reconnection of %s: %s\n",
1509 libcfs_nid2str(peer_ni->ibp_nid), reason);
1510 kiblnd_txlist_done(&txs, -ECONNABORTED,
1511 LNET_MSG_STATUS_LOCAL_ABORTED);
1516 kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
1518 struct kib_peer_ni *peer_ni;
1519 struct kib_peer_ni *peer2;
1520 struct kib_conn *conn;
1521 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1522 unsigned long flags;
1525 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1527 /* If I get here, I've committed to send, so I complete the tx with
1528 * failure on any problems */
1530 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1531 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1533 /* First time, just use a read lock since I expect to find my peer_ni
1535 read_lock_irqsave(g_lock, flags);
1537 peer_ni = kiblnd_find_peer_locked(ni, nid);
1538 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1539 /* Found a peer_ni with an established connection */
1540 conn = kiblnd_get_conn_locked(peer_ni);
1541 kiblnd_conn_addref(conn); /* 1 ref for me... */
1543 read_unlock_irqrestore(g_lock, flags);
1546 kiblnd_queue_tx(tx, conn);
1547 kiblnd_conn_decref(conn); /* ...to here */
1551 read_unlock(g_lock);
1552 /* Re-try with a write lock */
1555 peer_ni = kiblnd_find_peer_locked(ni, nid);
1556 if (peer_ni != NULL) {
1557 if (list_empty(&peer_ni->ibp_conns)) {
1558 /* found a peer_ni, but it's still connecting... */
1559 LASSERT(kiblnd_peer_connecting(peer_ni));
1561 list_add_tail(&tx->tx_list,
1562 &peer_ni->ibp_tx_queue);
1563 write_unlock_irqrestore(g_lock, flags);
1565 conn = kiblnd_get_conn_locked(peer_ni);
1566 kiblnd_conn_addref(conn); /* 1 ref for me... */
1568 write_unlock_irqrestore(g_lock, flags);
1571 kiblnd_queue_tx(tx, conn);
1572 kiblnd_conn_decref(conn); /* ...to here */
1577 write_unlock_irqrestore(g_lock, flags);
1579 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1580 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1582 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1584 tx->tx_status = -EHOSTUNREACH;
1586 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1592 write_lock_irqsave(g_lock, flags);
1594 peer2 = kiblnd_find_peer_locked(ni, nid);
1595 if (peer2 != NULL) {
1596 if (list_empty(&peer2->ibp_conns)) {
1597 /* found a peer_ni, but it's still connecting... */
1598 LASSERT(kiblnd_peer_connecting(peer2));
1600 list_add_tail(&tx->tx_list,
1601 &peer2->ibp_tx_queue);
1602 write_unlock_irqrestore(g_lock, flags);
1604 conn = kiblnd_get_conn_locked(peer2);
1605 kiblnd_conn_addref(conn); /* 1 ref for me... */
1607 write_unlock_irqrestore(g_lock, flags);
1610 kiblnd_queue_tx(tx, conn);
1611 kiblnd_conn_decref(conn); /* ...to here */
1614 kiblnd_peer_decref(peer_ni);
1618 /* Brand new peer_ni */
1619 LASSERT(peer_ni->ibp_connecting == 0);
1620 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1621 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1623 /* always called with a ref on ni, which prevents ni being shutdown */
1624 LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);
1627 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1629 kiblnd_peer_addref(peer_ni);
1630 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1632 write_unlock_irqrestore(g_lock, flags);
1634 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1635 kiblnd_connect_peer(peer_ni);
1636 kiblnd_peer_decref(peer_ni);
1640 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1642 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1643 int type = lntmsg->msg_type;
1644 struct lnet_process_id target = lntmsg->msg_target;
1645 int target_is_router = lntmsg->msg_target_is_router;
1646 int routing = lntmsg->msg_routing;
1647 unsigned int payload_niov = lntmsg->msg_niov;
1648 struct kvec *payload_iov = lntmsg->msg_iov;
1649 struct bio_vec *payload_kiov = lntmsg->msg_kiov;
1650 unsigned int payload_offset = lntmsg->msg_offset;
1651 unsigned int payload_nob = lntmsg->msg_len;
1652 struct kib_msg *ibmsg;
1653 struct kib_rdma_desc *rd;
1658 /* NB 'private' is different depending on what we're sending.... */
1660 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1661 payload_nob, payload_niov, libcfs_id2str(target));
1663 LASSERT (payload_nob == 0 || payload_niov > 0);
1664 LASSERT (payload_niov <= LNET_MAX_IOV);
1666 /* Thread context */
1667 LASSERT (!in_interrupt());
1668 /* payload is either all vaddrs or all pages */
1669 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1677 LASSERT (payload_nob == 0);
1681 if (routing || target_is_router)
1682 break; /* send IMMEDIATE */
1684 /* is the REPLY message too small for RDMA? */
1685 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1686 if (nob <= IBLND_MSG_SIZE)
1687 break; /* send IMMEDIATE */
1689 tx = kiblnd_get_idle_tx(ni, target.nid);
1691 CERROR("Can't allocate txd for GET to %s\n",
1692 libcfs_nid2str(target.nid));
1697 rd = &ibmsg->ibm_u.get.ibgm_rd;
1698 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1699 lntmsg->msg_md->md_niov,
1700 lntmsg->msg_md->md_kiov,
1701 0, lntmsg->msg_md->md_length);
1703 CERROR("Can't setup GET sink for %s: %d\n",
1704 libcfs_nid2str(target.nid), rc);
1705 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1710 nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
1711 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1712 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1714 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1716 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1717 if (tx->tx_lntmsg[1] == NULL) {
1718 CERROR("Can't create reply for GET -> %s\n",
1719 libcfs_nid2str(target.nid));
1724 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1725 tx->tx_waiting = 1; /* waiting for GET_DONE */
1726 kiblnd_launch_tx(ni, tx, target.nid);
1729 case LNET_MSG_REPLY:
1731 /* Is the payload small enough not to need RDMA? */
1732 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
1733 if (nob <= IBLND_MSG_SIZE)
1734 break; /* send IMMEDIATE */
1736 tx = kiblnd_get_idle_tx(ni, target.nid);
1738 CERROR("Can't allocate %s txd for %s\n",
1739 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1740 libcfs_nid2str(target.nid));
1744 if (payload_kiov == NULL)
1745 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1746 payload_niov, payload_iov,
1747 payload_offset, payload_nob);
1749 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1750 payload_niov, payload_kiov,
1751 payload_offset, payload_nob);
1753 CERROR("Can't setup PUT src for %s: %d\n",
1754 libcfs_nid2str(target.nid), rc);
1760 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1761 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1762 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
1763 sizeof(struct kib_putreq_msg));
1765 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1766 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1767 kiblnd_launch_tx(ni, tx, target.nid);
1771 /* send IMMEDIATE */
1772 LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
1775 tx = kiblnd_get_idle_tx(ni, target.nid);
1777 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1778 type, libcfs_nid2str(target.nid));
1783 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1785 if (payload_kiov != NULL)
1786 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1787 offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
1788 payload_niov, payload_kiov,
1789 payload_offset, payload_nob);
1791 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1792 offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
1793 payload_niov, payload_iov,
1794 payload_offset, payload_nob);
1796 nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
1797 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1799 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1800 kiblnd_launch_tx(ni, tx, target.nid);
1805 kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
1807 struct lnet_process_id target = lntmsg->msg_target;
1808 unsigned int niov = lntmsg->msg_niov;
1809 struct kvec *iov = lntmsg->msg_iov;
1810 struct bio_vec *kiov = lntmsg->msg_kiov;
1811 unsigned int offset = lntmsg->msg_offset;
1812 unsigned int nob = lntmsg->msg_len;
1816 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1818 CERROR("Can't get tx for REPLY to %s\n",
1819 libcfs_nid2str(target.nid));
1825 else if (kiov == NULL)
1826 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1827 niov, iov, offset, nob);
1829 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1830 niov, kiov, offset, nob);
1833 CERROR("Can't setup GET src for %s: %d\n",
1834 libcfs_nid2str(target.nid), rc);
1838 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1839 IBLND_MSG_GET_DONE, nob,
1840 &rx->rx_msg->ibm_u.get.ibgm_rd,
1841 rx->rx_msg->ibm_u.get.ibgm_cookie);
1843 CERROR("Can't setup rdma for GET from %s: %d\n",
1844 libcfs_nid2str(target.nid), rc);
1849 /* No RDMA: local completion may happen now! */
1850 lnet_finalize(lntmsg, 0);
1852 /* RDMA: lnet_finalize(lntmsg) when it
1854 tx->tx_lntmsg[0] = lntmsg;
1857 kiblnd_queue_tx(tx, rx->rx_conn);
1862 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1865 lnet_finalize(lntmsg, -EIO);
1869 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1870 int delayed, unsigned int niov, struct kvec *iov, struct bio_vec *kiov,
1871 unsigned int offset, unsigned int mlen, unsigned int rlen)
1873 struct kib_rx *rx = private;
1874 struct kib_msg *rxmsg = rx->rx_msg;
1875 struct kib_conn *conn = rx->rx_conn;
1879 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1882 LASSERT (mlen <= rlen);
1883 LASSERT (!in_interrupt());
1884 /* Either all pages or all vaddrs */
1885 LASSERT (!(kiov != NULL && iov != NULL));
1887 switch (rxmsg->ibm_type) {
1891 case IBLND_MSG_IMMEDIATE:
1892 nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
1893 if (nob > rx->rx_nob) {
1894 CERROR ("Immediate message from %s too big: %d(%d)\n",
1895 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1902 lnet_copy_flat2kiov(niov, kiov, offset,
1903 IBLND_MSG_SIZE, rxmsg,
1904 offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
1907 lnet_copy_flat2iov(niov, iov, offset,
1908 IBLND_MSG_SIZE, rxmsg,
1909 offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
1911 lnet_finalize(lntmsg, 0);
1914 case IBLND_MSG_PUT_REQ: {
1915 struct kib_msg *txmsg;
1916 struct kib_rdma_desc *rd;
1917 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1920 lnet_finalize(lntmsg, 0);
1921 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1926 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1928 CERROR("Can't allocate tx for %s\n",
1929 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1930 /* Not replying will break the connection */
1936 rd = &txmsg->ibm_u.putack.ibpam_rd;
1938 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1939 niov, iov, offset, mlen);
1941 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1942 niov, kiov, offset, mlen);
1944 CERROR("Can't setup PUT sink for %s: %d\n",
1945 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1946 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
1948 /* tell peer_ni it's over */
1949 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1954 nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
1955 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1956 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1958 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1960 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1961 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1962 kiblnd_queue_tx(tx, conn);
1964 /* reposted buffer reserved for PUT_DONE */
1965 post_credit = IBLND_POSTRX_NO_CREDIT;
1969 case IBLND_MSG_GET_REQ:
1970 if (lntmsg != NULL) {
1971 /* Optimized GET; RDMA lntmsg's payload */
1972 kiblnd_reply(ni, rx, lntmsg);
1974 /* GET didn't match anything */
1975 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1977 rxmsg->ibm_u.get.ibgm_cookie);
1982 kiblnd_post_rx(rx, post_credit);
1987 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1989 struct task_struct *task = kthread_run(fn, arg, name);
1992 return PTR_ERR(task);
1994 atomic_inc(&kiblnd_data.kib_nthreads);
1999 kiblnd_thread_fini (void)
2001 atomic_dec (&kiblnd_data.kib_nthreads);
2005 kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
2007 /* This is racy, but everyone's only writing ktime_get_seconds() */
2008 peer_ni->ibp_last_alive = ktime_get_seconds();
2013 kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
2016 time64_t last_alive = 0;
2017 unsigned long flags;
2019 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2021 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
2022 error = peer_ni->ibp_error;
2023 peer_ni->ibp_error = 0;
2025 last_alive = peer_ni->ibp_last_alive;
2028 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2031 lnet_notify(peer_ni->ibp_ni,
2032 peer_ni->ibp_nid, false, false, last_alive);
2036 kiblnd_close_conn_locked(struct kib_conn *conn, int error)
2038 /* This just does the immediate housekeeping. 'error' is zero for a
2039 * normal shutdown which can happen only after the connection has been
2040 * established. If the connection is established, schedule the
2041 * connection to be finished off by the connd. Otherwise the connd is
2042 * already dealing with it (either to set it up or tear it down).
2043 * Caller holds kib_global_lock exclusively in irq context */
2044 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2045 struct kib_dev *dev;
2046 unsigned long flags;
2048 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2050 if (error != 0 && conn->ibc_comms_error == 0)
2051 conn->ibc_comms_error = error;
2053 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
2054 return; /* already being handled */
2057 list_empty(&conn->ibc_tx_noops) &&
2058 list_empty(&conn->ibc_tx_queue) &&
2059 list_empty(&conn->ibc_tx_queue_rsrvd) &&
2060 list_empty(&conn->ibc_tx_queue_nocred) &&
2061 list_empty(&conn->ibc_active_txs)) {
2062 CDEBUG(D_NET, "closing conn to %s\n",
2063 libcfs_nid2str(peer_ni->ibp_nid));
2065 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
2066 libcfs_nid2str(peer_ni->ibp_nid), error,
2067 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
2068 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
2069 list_empty(&conn->ibc_tx_queue_rsrvd) ?
2070 "" : "(sending_rsrvd)",
2071 list_empty(&conn->ibc_tx_queue_nocred) ?
2072 "" : "(sending_nocred)",
2073 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
2076 dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
2077 if (peer_ni->ibp_next_conn == conn)
2078 /* clear next_conn so it won't be used */
2079 peer_ni->ibp_next_conn = NULL;
2080 list_del(&conn->ibc_list);
2081 /* connd (see below) takes over ibc_list's ref */
2083 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
2084 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
2085 kiblnd_unlink_peer_locked(peer_ni);
2087 /* set/clear error on last conn */
2088 peer_ni->ibp_error = conn->ibc_comms_error;
2091 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
2094 kiblnd_dev_can_failover(dev)) {
2095 list_add_tail(&dev->ibd_fail_list,
2096 &kiblnd_data.kib_failed_devs);
2097 wake_up(&kiblnd_data.kib_failover_waitq);
2100 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2102 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2103 wake_up(&kiblnd_data.kib_connd_waitq);
2105 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2109 kiblnd_close_conn(struct kib_conn *conn, int error)
2111 unsigned long flags;
2113 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2115 kiblnd_close_conn_locked(conn, error);
2117 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2121 kiblnd_handle_early_rxs(struct kib_conn *conn)
2123 unsigned long flags;
2126 LASSERT(!in_interrupt());
2127 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
2129 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2130 while (!list_empty(&conn->ibc_early_rxs)) {
2131 rx = list_entry(conn->ibc_early_rxs.next,
2132 struct kib_rx, rx_list);
2133 list_del(&rx->rx_list);
2134 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2136 kiblnd_handle_rx(rx);
2138 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2140 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2144 kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
2147 struct list_head *tmp;
2148 struct list_head *nxt;
2151 spin_lock(&conn->ibc_lock);
2153 list_for_each_safe(tmp, nxt, txs) {
2154 tx = list_entry(tmp, struct kib_tx, tx_list);
2156 if (txs == &conn->ibc_active_txs) {
2157 LASSERT(!tx->tx_queued);
2158 LASSERT(tx->tx_waiting ||
2159 tx->tx_sending != 0);
2160 if (conn->ibc_comms_error == -ETIMEDOUT) {
2161 if (tx->tx_waiting && !tx->tx_sending)
2163 LNET_MSG_STATUS_REMOTE_TIMEOUT;
2164 else if (tx->tx_sending)
2166 LNET_MSG_STATUS_NETWORK_TIMEOUT;
2169 LASSERT(tx->tx_queued);
2170 if (conn->ibc_comms_error == -ETIMEDOUT)
2171 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
2173 tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
2176 tx->tx_status = -ECONNABORTED;
2180 * TODO: This makes an assumption that
2181 * kiblnd_tx_complete() will be called for each tx. If
2182 * that event is dropped we could end up with stale
2183 * connections floating around. We'd like to deal with
2184 * that in a better way.
2186 * Also that means we can exceed the timeout by many
2189 if (tx->tx_sending == 0) {
2191 list_move(&tx->tx_list, &zombies);
2195 spin_unlock(&conn->ibc_lock);
2198 * aborting transmits occurs when finalizing the connection.
2199 * The connection is finalized on error.
2200 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
2201 * override the value already set in tx->tx_hstatus above.
2203 kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
2207 kiblnd_finalise_conn(struct kib_conn *conn)
2209 LASSERT (!in_interrupt());
2210 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2212 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2213 * for connections that didn't get as far as being connected, because
2214 * rdma_disconnect() does this for free. */
2215 kiblnd_abort_receives(conn);
2217 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2219 /* Complete all tx descs not waiting for sends to complete.
2220 * NB we should be safe from RDMA now that the QP has changed state */
2222 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2223 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2224 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2225 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2226 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2228 kiblnd_handle_early_rxs(conn);
2232 kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
2236 unsigned long flags;
2238 LASSERT (error != 0);
2239 LASSERT (!in_interrupt());
2241 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2244 LASSERT(peer_ni->ibp_connecting > 0);
2245 peer_ni->ibp_connecting--;
2247 LASSERT (peer_ni->ibp_accepting > 0);
2248 peer_ni->ibp_accepting--;
2251 if (kiblnd_peer_connecting(peer_ni)) {
2252 /* another connection attempt under way... */
2253 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2258 peer_ni->ibp_reconnected = 0;
2259 if (list_empty(&peer_ni->ibp_conns)) {
2260 /* Take peer_ni's blocked transmits to complete with error */
2261 list_splice_init(&peer_ni->ibp_tx_queue, &zombies);
2263 if (kiblnd_peer_active(peer_ni))
2264 kiblnd_unlink_peer_locked(peer_ni);
2266 peer_ni->ibp_error = error;
2268 /* Can't have blocked transmits if there are connections */
2269 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2272 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2274 kiblnd_peer_notify(peer_ni);
2276 if (list_empty(&zombies))
2279 CNETERR("Deleting messages for %s: connection failed\n",
2280 libcfs_nid2str(peer_ni->ibp_nid));
2282 kiblnd_txlist_done(&zombies, error,
2283 LNET_MSG_STATUS_LOCAL_DROPPED);
2287 kiblnd_connreq_done(struct kib_conn *conn, int status)
2289 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2292 unsigned long flags;
2295 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2297 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2298 libcfs_nid2str(peer_ni->ibp_nid), active,
2299 conn->ibc_version, status);
2301 LASSERT (!in_interrupt());
2302 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2303 peer_ni->ibp_connecting > 0) ||
2304 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2305 peer_ni->ibp_accepting > 0));
2307 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2308 conn->ibc_connvars = NULL;
2311 /* failed to establish connection */
2312 kiblnd_peer_connect_failed(peer_ni, active, status);
2313 kiblnd_finalise_conn(conn);
2317 /* connection established */
2318 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2320 conn->ibc_last_send = ktime_get();
2321 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2322 kiblnd_peer_alive(peer_ni);
2324 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2325 * peer_ni instance... */
2326 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2327 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2328 peer_ni->ibp_reconnected = 0;
2330 peer_ni->ibp_connecting--;
2332 peer_ni->ibp_accepting--;
2334 if (peer_ni->ibp_version == 0) {
2335 peer_ni->ibp_version = conn->ibc_version;
2336 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2339 if (peer_ni->ibp_version != conn->ibc_version ||
2340 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2341 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2342 conn->ibc_incarnation);
2343 peer_ni->ibp_version = conn->ibc_version;
2344 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2347 /* grab pending txs while I have the lock */
2348 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
2350 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2351 conn->ibc_comms_error != 0) { /* error has happened already */
2353 /* start to shut down connection */
2354 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2355 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2357 kiblnd_txlist_done(&txs, -ECONNABORTED,
2358 LNET_MSG_STATUS_LOCAL_ERROR);
2363 /* +1 ref for myself, this connection is visible to other threads
2364 * now, refcount of peer:ibp_conns can be released by connection
2365 * close from either a different thread, or the calling of
2366 * kiblnd_check_sends_locked() below. See bz21911 for details.
2368 kiblnd_conn_addref(conn);
2369 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2371 /* Schedule blocked txs
2372 * Note: if we are running with conns_per_peer > 1, these blocked
2373 * txs will all get scheduled to the first connection which gets
2374 * scheduled. We won't be using round robin on this first batch.
2376 spin_lock(&conn->ibc_lock);
2377 while (!list_empty(&txs)) {
2378 tx = list_entry(txs.next, struct kib_tx, tx_list);
2379 list_del(&tx->tx_list);
2381 kiblnd_queue_tx_locked(tx, conn);
2383 kiblnd_check_sends_locked(conn);
2384 spin_unlock(&conn->ibc_lock);
2386 /* schedule blocked rxs */
2387 kiblnd_handle_early_rxs(conn);
2388 kiblnd_conn_decref(conn);
2392 kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
2396 rc = rdma_reject(cmid, rej, sizeof(*rej));
2399 CWARN("Error %d sending reject\n", rc);
2403 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2405 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2406 struct kib_msg *reqmsg = priv;
2407 struct kib_msg *ackmsg;
2408 struct kib_dev *ibdev;
2409 struct kib_peer_ni *peer_ni;
2410 struct kib_peer_ni *peer2;
2411 struct kib_conn *conn;
2412 struct lnet_ni *ni = NULL;
2413 struct kib_net *net = NULL;
2415 struct rdma_conn_param cp;
2417 int version = IBLND_MSG_VERSION;
2418 unsigned long flags;
2420 struct sockaddr_in *peer_addr;
2421 LASSERT (!in_interrupt());
2423 /* cmid inherits 'context' from the corresponding listener id */
2424 ibdev = cmid->context;
2427 memset(&rej, 0, sizeof(rej));
2428 rej.ibr_magic = IBLND_MSG_MAGIC;
2429 rej.ibr_why = IBLND_REJECT_FATAL;
2430 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2432 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2433 if (*kiblnd_tunables.kib_require_priv_port &&
2434 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2435 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2436 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2437 &ip, ntohs(peer_addr->sin_port));
2441 if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
2442 CERROR("Short connection request\n");
2446 /* Future protocol version compatibility support! If the
2447 * o2iblnd-specific protocol changes, or when LNET unifies
2448 * protocols over all LNDs, the initial connection will
2449 * negotiate a protocol version. I trap this here to avoid
2450 * console errors; the reject tells the peer_ni which protocol I
2452 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2453 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2455 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2456 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2457 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2459 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2460 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2461 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2464 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2466 CERROR("Can't parse connection request: %d\n", rc);
2470 nid = reqmsg->ibm_srcnid;
2471 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2474 net = (struct kib_net *)ni->ni_data;
2475 rej.ibr_incarnation = net->ibn_incarnation;
2478 if (ni == NULL || /* no matching net */
2479 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2480 net->ibn_dev != ibdev) { /* wrong device */
2481 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2482 "bad dst nid %s\n", libcfs_nid2str(nid),
2483 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2484 ibdev->ibd_ifname, ibdev->ibd_nnets,
2486 libcfs_nid2str(reqmsg->ibm_dstnid));
2491 /* check time stamp as soon as possible */
2492 if (reqmsg->ibm_dststamp != 0 &&
2493 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2494 CWARN("Stale connection request\n");
2495 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2499 /* I can accept peer_ni's version */
2500 version = reqmsg->ibm_version;
2502 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2503 CERROR("Unexpected connreq msg type: %x from %s\n",
2504 reqmsg->ibm_type, libcfs_nid2str(nid));
2508 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2509 kiblnd_msg_queue_size(version, ni)) {
2510 CERROR("Can't accept conn from %s, queue depth too large: "
2511 " %d (<=%d wanted)\n",
2512 libcfs_nid2str(nid),
2513 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2514 kiblnd_msg_queue_size(version, ni));
2516 if (version == IBLND_MSG_VERSION)
2517 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2522 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2523 IBLND_MAX_RDMA_FRAGS) {
2524 CWARN("Can't accept conn from %s (version %x): "
2525 "max_frags %d too large (%d wanted)\n",
2526 libcfs_nid2str(nid), version,
2527 reqmsg->ibm_u.connparams.ibcp_max_frags,
2528 IBLND_MAX_RDMA_FRAGS);
2530 if (version >= IBLND_MSG_VERSION)
2531 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2534 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2535 IBLND_MAX_RDMA_FRAGS &&
2536 net->ibn_fmr_ps == NULL) {
2537 CWARN("Can't accept conn from %s (version %x): "
2538 "max_frags %d incompatible without FMR pool "
2540 libcfs_nid2str(nid), version,
2541 reqmsg->ibm_u.connparams.ibcp_max_frags,
2542 IBLND_MAX_RDMA_FRAGS);
2544 if (version == IBLND_MSG_VERSION)
2545 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2550 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2551 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2552 libcfs_nid2str(nid),
2553 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2558 /* assume 'nid' is a new peer_ni; create */
2559 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2561 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2562 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2566 /* We have validated the peer's parameters so use those */
2567 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2568 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2570 write_lock_irqsave(g_lock, flags);
2572 peer2 = kiblnd_find_peer_locked(ni, nid);
2573 if (peer2 != NULL) {
2574 if (peer2->ibp_version == 0) {
2575 peer2->ibp_version = version;
2576 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2579 /* not the guy I've talked with */
2580 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2581 peer2->ibp_version != version) {
2582 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2584 if (kiblnd_peer_active(peer2)) {
2585 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2586 peer2->ibp_version = version;
2588 write_unlock_irqrestore(g_lock, flags);
2590 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2591 libcfs_nid2str(nid), peer2->ibp_version, version,
2592 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2594 kiblnd_peer_decref(peer_ni);
2595 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2599 /* Tie-break connection race in favour of the higher NID.
2600 * If we keep running into a race condition multiple times,
2601 * we have to assume that the connection attempt with the
2602 * higher NID is stuck in a connecting state and will never
2603 * recover. As such, we pass through this if-block and let
2604 * the lower NID connection win so we can move forward.
2606 if (peer2->ibp_connecting != 0 &&
2607 nid < ni->ni_nid && peer2->ibp_races <
2608 MAX_CONN_RACES_BEFORE_ABORT) {
2610 write_unlock_irqrestore(g_lock, flags);
2612 CDEBUG(D_NET, "Conn race %s\n",
2613 libcfs_nid2str(peer2->ibp_nid));
2615 kiblnd_peer_decref(peer_ni);
2616 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2619 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2620 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2621 libcfs_nid2str(peer2->ibp_nid),
2622 MAX_CONN_RACES_BEFORE_ABORT);
2624 * passive connection is allowed even this peer_ni is waiting for
2627 peer2->ibp_reconnecting = 0;
2628 peer2->ibp_races = 0;
2629 peer2->ibp_accepting++;
2630 kiblnd_peer_addref(peer2);
2632 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2633 * so copy validated parameters since we now know what the
2634 * peer_ni's limits are */
2635 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2636 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2638 write_unlock_irqrestore(g_lock, flags);
2639 kiblnd_peer_decref(peer_ni);
2642 /* Brand new peer_ni */
2643 LASSERT (peer_ni->ibp_accepting == 0);
2644 LASSERT (peer_ni->ibp_version == 0 &&
2645 peer_ni->ibp_incarnation == 0);
2647 peer_ni->ibp_accepting = 1;
2648 peer_ni->ibp_version = version;
2649 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2651 /* I have a ref on ni that prevents it being shutdown */
2652 LASSERT (net->ibn_shutdown == 0);
2654 kiblnd_peer_addref(peer_ni);
2655 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2657 write_unlock_irqrestore(g_lock, flags);
2660 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2662 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2663 kiblnd_peer_decref(peer_ni);
2664 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2668 /* conn now "owns" cmid, so I return success from here on to ensure the
2669 * CM callback doesn't destroy cmid. */
2670 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2671 conn->ibc_credits = conn->ibc_queue_depth;
2672 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2673 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2674 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2676 ackmsg = &conn->ibc_connvars->cv_msg;
2677 memset(ackmsg, 0, sizeof(*ackmsg));
2679 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2680 sizeof(ackmsg->ibm_u.connparams));
2681 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2682 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2683 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2685 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2687 memset(&cp, 0, sizeof(cp));
2688 cp.private_data = ackmsg;
2689 cp.private_data_len = ackmsg->ibm_nob;
2690 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2691 cp.initiator_depth = 0;
2692 cp.flow_control = 1;
2693 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2694 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2696 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2698 rc = rdma_accept(cmid, &cp);
2700 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2701 rej.ibr_version = version;
2702 rej.ibr_why = IBLND_REJECT_FATAL;
2704 kiblnd_reject(cmid, &rej);
2705 kiblnd_connreq_done(conn, rc);
2706 kiblnd_conn_decref(conn);
2714 rej.ibr_cp.ibcp_queue_depth =
2715 kiblnd_msg_queue_size(version, ni);
2716 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2720 rej.ibr_version = version;
2721 kiblnd_reject(cmid, &rej);
2723 return -ECONNREFUSED;
2727 kiblnd_check_reconnect(struct kib_conn *conn, int version,
2728 u64 incarnation, int why, struct kib_connparams *cp)
2730 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2731 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2733 int msg_size = IBLND_MSG_SIZE;
2737 unsigned long flags;
2739 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2740 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2743 msg_size = cp->ibcp_max_msg_size;
2744 frag_num = cp->ibcp_max_frags;
2745 queue_dep = cp->ibcp_queue_depth;
2748 write_lock_irqsave(glock, flags);
2749 /* retry connection if it's still needed and no other connection
2750 * attempts (active or passive) are in progress
2751 * NB: reconnect is still needed even when ibp_tx_queue is
2752 * empty if ibp_version != version because reconnect may be
2755 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2756 peer_ni->ibp_version != version) &&
2757 peer_ni->ibp_connecting &&
2758 peer_ni->ibp_accepting == 0;
2769 case IBLND_REJECT_RDMA_FRAGS: {
2770 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2773 reason = "can't negotiate max frags";
2776 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2777 #ifdef HAVE_IB_GET_DMA_MR
2779 * This check only makes sense if the kernel supports global
2780 * memory registration. Otherwise, map_on_demand will never == 0
2782 if (!tunables->lnd_map_on_demand) {
2783 reason = "map_on_demand must be enabled";
2787 if (conn->ibc_max_frags <= frag_num) {
2788 reason = "unsupported max frags";
2792 peer_ni->ibp_max_frags = frag_num;
2793 reason = "rdma fragments";
2796 case IBLND_REJECT_MSG_QUEUE_SIZE:
2798 reason = "can't negotiate queue depth";
2801 if (conn->ibc_queue_depth <= queue_dep) {
2802 reason = "unsupported queue depth";
2806 peer_ni->ibp_queue_depth = queue_dep;
2807 reason = "queue depth";
2810 case IBLND_REJECT_CONN_STALE:
2814 case IBLND_REJECT_CONN_RACE:
2815 reason = "conn race";
2818 case IBLND_REJECT_CONN_UNCOMPAT:
2819 reason = "version negotiation";
2822 case IBLND_REJECT_INVALID_SRV_ID:
2823 reason = "invalid service id";
2827 conn->ibc_reconnect = 1;
2828 peer_ni->ibp_reconnecting++;
2829 peer_ni->ibp_version = version;
2830 if (incarnation != 0)
2831 peer_ni->ibp_incarnation = incarnation;
2833 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2835 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2836 libcfs_nid2str(peer_ni->ibp_nid),
2837 reconnect ? "reconnect" : "don't reconnect",
2838 reason, IBLND_MSG_VERSION, version, msg_size,
2839 conn->ibc_queue_depth, queue_dep,
2840 conn->ibc_max_frags, frag_num);
2842 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2843 * while destroying the zombie
2848 kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
2850 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2852 LASSERT (!in_interrupt());
2853 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2856 case IB_CM_REJ_STALE_CONN:
2857 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2858 IBLND_REJECT_CONN_STALE, NULL);
2861 case IB_CM_REJ_INVALID_SERVICE_ID:
2862 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2863 IBLND_REJECT_INVALID_SRV_ID, NULL);
2864 CNETERR("%s rejected: no listener at %d\n",
2865 libcfs_nid2str(peer_ni->ibp_nid),
2866 *kiblnd_tunables.kib_service);
2869 case IB_CM_REJ_CONSUMER_DEFINED:
2870 if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
2871 struct kib_rej *rej = priv;
2872 struct kib_connparams *cp = NULL;
2874 __u64 incarnation = -1;
2876 /* NB. default incarnation is -1 because:
2877 * a) V1 will ignore dst incarnation in connreq.
2878 * b) V2 will provide incarnation while rejecting me,
2879 * -1 will be overwrote.
2881 * if I try to connect to a V1 peer_ni with V2 protocol,
2882 * it rejected me then upgrade to V2, I have no idea
2883 * about the upgrading and try to reconnect with V1,
2884 * in this case upgraded V2 can find out I'm trying to
2885 * talk to the old guy and reject me(incarnation is -1).
2888 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2889 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2890 __swab32s(&rej->ibr_magic);
2891 __swab16s(&rej->ibr_version);
2895 if (priv_nob >= sizeof(struct kib_rej) &&
2896 rej->ibr_version > IBLND_MSG_VERSION_1) {
2897 /* priv_nob is always 148 in current version
2898 * of OFED, so we still need to check version.
2899 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2903 __swab64s(&rej->ibr_incarnation);
2904 __swab16s(&cp->ibcp_queue_depth);
2905 __swab16s(&cp->ibcp_max_frags);
2906 __swab32s(&cp->ibcp_max_msg_size);
2909 incarnation = rej->ibr_incarnation;
2912 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2913 rej->ibr_magic != LNET_PROTO_MAGIC) {
2914 CERROR("%s rejected: consumer defined fatal error\n",
2915 libcfs_nid2str(peer_ni->ibp_nid));
2919 if (rej->ibr_version != IBLND_MSG_VERSION &&
2920 rej->ibr_version != IBLND_MSG_VERSION_1) {
2921 CERROR("%s rejected: o2iblnd version %x error\n",
2922 libcfs_nid2str(peer_ni->ibp_nid),
2927 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2928 rej->ibr_version == IBLND_MSG_VERSION_1) {
2929 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2930 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2932 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2933 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2936 switch (rej->ibr_why) {
2937 case IBLND_REJECT_CONN_RACE:
2938 case IBLND_REJECT_CONN_STALE:
2939 case IBLND_REJECT_CONN_UNCOMPAT:
2940 case IBLND_REJECT_MSG_QUEUE_SIZE:
2941 case IBLND_REJECT_RDMA_FRAGS:
2942 kiblnd_check_reconnect(conn, rej->ibr_version,
2943 incarnation, rej->ibr_why, cp);
2946 case IBLND_REJECT_NO_RESOURCES:
2947 CERROR("%s rejected: o2iblnd no resources\n",
2948 libcfs_nid2str(peer_ni->ibp_nid));
2951 case IBLND_REJECT_FATAL:
2952 CERROR("%s rejected: o2iblnd fatal error\n",
2953 libcfs_nid2str(peer_ni->ibp_nid));
2957 CERROR("%s rejected: o2iblnd reason %d\n",
2958 libcfs_nid2str(peer_ni->ibp_nid),
2966 CNETERR("%s rejected: reason %d, size %d\n",
2967 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2971 kiblnd_connreq_done(conn, -ECONNREFUSED);
2975 kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
2977 struct kib_peer_ni *peer_ni = conn->ibc_peer;
2978 struct lnet_ni *ni = peer_ni->ibp_ni;
2979 struct kib_net *net = ni->ni_data;
2980 struct kib_msg *msg = priv;
2981 int ver = conn->ibc_version;
2982 int rc = kiblnd_unpack_msg(msg, priv_nob);
2983 unsigned long flags;
2985 LASSERT (net != NULL);
2988 CERROR("Can't unpack connack from %s: %d\n",
2989 libcfs_nid2str(peer_ni->ibp_nid), rc);
2993 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2994 CERROR("Unexpected message %d from %s\n",
2995 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
3000 if (ver != msg->ibm_version) {
3001 CERROR("%s replied version %x is different with "
3002 "requested version %x\n",
3003 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
3008 if (msg->ibm_u.connparams.ibcp_queue_depth >
3009 conn->ibc_queue_depth) {
3010 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
3011 libcfs_nid2str(peer_ni->ibp_nid),
3012 msg->ibm_u.connparams.ibcp_queue_depth,
3013 conn->ibc_queue_depth);
3018 if (msg->ibm_u.connparams.ibcp_max_frags >
3019 conn->ibc_max_frags) {
3020 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
3021 libcfs_nid2str(peer_ni->ibp_nid),
3022 msg->ibm_u.connparams.ibcp_max_frags,
3023 conn->ibc_max_frags);
3028 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
3029 CERROR("%s max message size %d too big (%d max)\n",
3030 libcfs_nid2str(peer_ni->ibp_nid),
3031 msg->ibm_u.connparams.ibcp_max_msg_size,
3037 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3038 if (msg->ibm_dstnid == ni->ni_nid &&
3039 msg->ibm_dststamp == net->ibn_incarnation)
3043 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3046 CERROR("Bad connection reply from %s, rc = %d, "
3047 "version: %x max_frags: %d\n",
3048 libcfs_nid2str(peer_ni->ibp_nid), rc,
3049 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
3053 conn->ibc_incarnation = msg->ibm_srcstamp;
3054 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
3055 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
3056 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
3057 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
3058 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
3059 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
3061 kiblnd_connreq_done(conn, 0);
3065 /* NB My QP has already established itself, so I handle anything going
3066 * wrong here by setting ibc_comms_error.
3067 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
3068 * immediately tears it down. */
3071 conn->ibc_comms_error = rc;
3072 kiblnd_connreq_done(conn, 0);
3076 kiblnd_active_connect(struct rdma_cm_id *cmid)
3078 struct kib_peer_ni *peer_ni = cmid->context;
3079 struct kib_conn *conn;
3080 struct kib_msg *msg;
3081 struct rdma_conn_param cp;
3084 unsigned long flags;
3087 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3089 incarnation = peer_ni->ibp_incarnation;
3090 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
3091 peer_ni->ibp_version;
3093 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3095 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
3098 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
3099 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
3103 /* conn "owns" cmid now, so I return success from here on to ensure the
3104 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
3107 msg = &conn->ibc_connvars->cv_msg;
3109 memset(msg, 0, sizeof(*msg));
3110 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
3111 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
3112 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
3113 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
3115 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
3116 0, peer_ni->ibp_nid, incarnation);
3118 memset(&cp, 0, sizeof(cp));
3119 cp.private_data = msg;
3120 cp.private_data_len = msg->ibm_nob;
3121 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
3122 cp.initiator_depth = 0;
3123 cp.flow_control = 1;
3124 cp.retry_count = *kiblnd_tunables.kib_retry_count;
3125 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
3127 LASSERT(cmid->context == (void *)conn);
3128 LASSERT(conn->ibc_cmid == cmid);
3130 rc = rdma_connect(cmid, &cp);
3132 CERROR("Can't connect to %s: %d\n",
3133 libcfs_nid2str(peer_ni->ibp_nid), rc);
3134 kiblnd_connreq_done(conn, rc);
3135 kiblnd_conn_decref(conn);
3142 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3144 struct kib_peer_ni *peer_ni;
3145 struct kib_conn *conn;
3148 switch (event->event) {
3150 CERROR("Unexpected event: %d, status: %d\n",
3151 event->event, event->status);
3154 case RDMA_CM_EVENT_CONNECT_REQUEST:
3155 /* destroy cmid on failure */
3156 rc = kiblnd_passive_connect(cmid,
3157 (void *)KIBLND_CONN_PARAM(event),
3158 KIBLND_CONN_PARAM_LEN(event));
3159 CDEBUG(D_NET, "connreq: %d\n", rc);
3162 case RDMA_CM_EVENT_ADDR_ERROR:
3163 peer_ni = cmid->context;
3164 CNETERR("%s: ADDR ERROR %d\n",
3165 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3166 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3167 kiblnd_peer_decref(peer_ni);
3168 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3170 case RDMA_CM_EVENT_ADDR_RESOLVED:
3171 peer_ni = cmid->context;
3173 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3174 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3176 if (event->status != 0) {
3177 CNETERR("Can't resolve address for %s: %d\n",
3178 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3181 rc = rdma_resolve_route(
3182 cmid, lnet_get_lnd_timeout() * 1000);
3184 struct kib_net *net = peer_ni->ibp_ni->ni_data;
3185 struct kib_dev *dev = net->ibn_dev;
3187 CDEBUG(D_NET, "%s: connection bound to "\
3189 libcfs_nid2str(peer_ni->ibp_nid),
3191 &dev->ibd_ifip, cmid->device->name);
3196 /* Can't initiate route resolution */
3197 CERROR("Can't resolve route for %s: %d\n",
3198 libcfs_nid2str(peer_ni->ibp_nid), rc);
3200 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3201 kiblnd_peer_decref(peer_ni);
3202 return rc; /* rc != 0 destroys cmid */
3204 case RDMA_CM_EVENT_ROUTE_ERROR:
3205 peer_ni = cmid->context;
3206 CNETERR("%s: ROUTE ERROR %d\n",
3207 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3208 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3209 kiblnd_peer_decref(peer_ni);
3210 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3212 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3213 peer_ni = cmid->context;
3214 CDEBUG(D_NET,"%s Route resolved: %d\n",
3215 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3217 if (event->status == 0)
3218 return kiblnd_active_connect(cmid);
3220 CNETERR("Can't resolve route for %s: %d\n",
3221 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3222 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3223 kiblnd_peer_decref(peer_ni);
3224 return event->status; /* rc != 0 destroys cmid */
3226 case RDMA_CM_EVENT_UNREACHABLE:
3227 conn = cmid->context;
3228 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3229 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3230 CNETERR("%s: UNREACHABLE %d\n",
3231 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3232 kiblnd_connreq_done(conn, -ENETDOWN);
3233 kiblnd_conn_decref(conn);
3236 case RDMA_CM_EVENT_CONNECT_ERROR:
3237 conn = cmid->context;
3238 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3239 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3240 CNETERR("%s: CONNECT ERROR %d\n",
3241 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3242 kiblnd_connreq_done(conn, -ENOTCONN);
3243 kiblnd_conn_decref(conn);
3246 case RDMA_CM_EVENT_REJECTED:
3247 conn = cmid->context;
3248 switch (conn->ibc_state) {
3252 case IBLND_CONN_PASSIVE_WAIT:
3253 CERROR ("%s: REJECTED %d\n",
3254 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3256 kiblnd_connreq_done(conn, -ECONNRESET);
3259 case IBLND_CONN_ACTIVE_CONNECT:
3260 kiblnd_rejected(conn, event->status,
3261 (void *)KIBLND_CONN_PARAM(event),
3262 KIBLND_CONN_PARAM_LEN(event));
3265 kiblnd_conn_decref(conn);
3268 case RDMA_CM_EVENT_ESTABLISHED:
3269 conn = cmid->context;
3270 switch (conn->ibc_state) {
3274 case IBLND_CONN_PASSIVE_WAIT:
3275 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3276 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3277 kiblnd_connreq_done(conn, 0);
3280 case IBLND_CONN_ACTIVE_CONNECT:
3281 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3282 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3283 kiblnd_check_connreply(conn,
3284 (void *)KIBLND_CONN_PARAM(event),
3285 KIBLND_CONN_PARAM_LEN(event));
3288 /* net keeps its ref on conn! */
3291 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3292 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3295 case RDMA_CM_EVENT_DISCONNECTED:
3296 conn = cmid->context;
3297 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3298 CERROR("%s DISCONNECTED\n",
3299 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3300 kiblnd_connreq_done(conn, -ECONNRESET);
3302 kiblnd_close_conn(conn, 0);
3304 kiblnd_conn_decref(conn);
3305 cmid->context = NULL;
3308 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3309 LCONSOLE_ERROR_MSG(0x131,
3310 "Received notification of device removal\n"
3311 "Please shutdown LNET to allow this to proceed\n");
3312 /* Can't remove network from underneath LNET for now, so I have
3316 case RDMA_CM_EVENT_ADDR_CHANGE:
3317 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3323 kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
3326 struct list_head *ttmp;
3328 list_for_each(ttmp, txs) {
3329 tx = list_entry(ttmp, struct kib_tx, tx_list);
3331 if (txs != &conn->ibc_active_txs) {
3332 LASSERT(tx->tx_queued);
3334 LASSERT(!tx->tx_queued);
3335 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3338 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3339 CERROR("Timed out tx: %s, %lld seconds\n",
3340 kiblnd_queue2str(conn, txs),
3341 ktime_ms_delta(ktime_get(),
3342 tx->tx_deadline) / MSEC_PER_SEC);
3351 kiblnd_conn_timed_out_locked(struct kib_conn *conn)
3353 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3354 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3355 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3356 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3357 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3361 kiblnd_check_conns (int idx)
3364 LIST_HEAD(checksends);
3365 LIST_HEAD(timedout_txs);
3366 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3367 struct list_head *ptmp;
3368 struct kib_peer_ni *peer_ni;
3369 struct kib_conn *conn;
3370 struct kib_tx *tx, *tx_tmp;
3371 struct list_head *ctmp;
3372 unsigned long flags;
3374 /* NB. We expect to have a look at all the peers and not find any
3375 * RDMAs to time out, so we just use a shared lock while we
3377 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3379 list_for_each(ptmp, peers) {
3380 peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);
3382 /* Check tx_deadline */
3383 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3384 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3385 CWARN("Timed out tx for %s: %lld seconds\n",
3386 libcfs_nid2str(peer_ni->ibp_nid),
3387 ktime_ms_delta(ktime_get(),
3388 tx->tx_deadline) / MSEC_PER_SEC);
3389 list_move(&tx->tx_list, &timedout_txs);
3393 list_for_each(ctmp, &peer_ni->ibp_conns) {
3397 conn = list_entry(ctmp, struct kib_conn, ibc_list);
3399 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3401 spin_lock(&conn->ibc_lock);
3403 sendnoop = kiblnd_need_noop(conn);
3404 timedout = kiblnd_conn_timed_out_locked(conn);
3405 if (!sendnoop && !timedout) {
3406 spin_unlock(&conn->ibc_lock);
3411 CERROR("Timed out RDMA with %s (%lld): "
3412 "c: %u, oc: %u, rc: %u\n",
3413 libcfs_nid2str(peer_ni->ibp_nid),
3414 ktime_get_seconds() - peer_ni->ibp_last_alive,
3416 conn->ibc_outstanding_credits,
3417 conn->ibc_reserved_credits);
3418 list_add(&conn->ibc_connd_list, &closes);
3420 list_add(&conn->ibc_connd_list, &checksends);
3422 /* +ref for 'closes' or 'checksends' */
3423 kiblnd_conn_addref(conn);
3425 spin_unlock(&conn->ibc_lock);
3429 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3431 if (!list_empty(&timedout_txs))
3432 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
3433 LNET_MSG_STATUS_LOCAL_TIMEOUT);
3435 /* Handle timeout by closing the whole
3436 * connection. We can only be sure RDMA activity
3437 * has ceased once the QP has been modified. */
3438 while (!list_empty(&closes)) {
3439 conn = list_entry(closes.next,
3440 struct kib_conn, ibc_connd_list);
3441 list_del(&conn->ibc_connd_list);
3442 kiblnd_close_conn(conn, -ETIMEDOUT);
3443 kiblnd_conn_decref(conn);
3446 /* In case we have enough credits to return via a
3447 * NOOP, but there were no non-blocking tx descs
3448 * free to do it last time... */
3449 while (!list_empty(&checksends)) {
3450 conn = list_entry(checksends.next,
3451 struct kib_conn, ibc_connd_list);
3452 list_del(&conn->ibc_connd_list);
3454 spin_lock(&conn->ibc_lock);
3455 kiblnd_check_sends_locked(conn);
3456 spin_unlock(&conn->ibc_lock);
3458 kiblnd_conn_decref(conn);
3463 kiblnd_disconnect_conn(struct kib_conn *conn)
3465 LASSERT (!in_interrupt());
3466 LASSERT (current == kiblnd_data.kib_connd);
3467 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3469 rdma_disconnect(conn->ibc_cmid);
3470 kiblnd_finalise_conn(conn);
3472 kiblnd_peer_notify(conn->ibc_peer);
3476 * High-water for reconnection to the same peer_ni, reconnection attempt should
3477 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3479 #define KIB_RECONN_HIGH_RACE 10
3481 * Allow connd to take a break and handle other things after consecutive
3482 * reconnection attemps.
3484 #define KIB_RECONN_BREAK 100
3487 kiblnd_connd (void *arg)
3489 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3490 wait_queue_entry_t wait;
3491 unsigned long flags;
3492 struct kib_conn *conn;
3497 unsigned long deadline = jiffies;
3499 init_waitqueue_entry(&wait, current);
3500 kiblnd_data.kib_connd = current;
3502 spin_lock_irqsave(lock, flags);
3504 while (!kiblnd_data.kib_shutdown) {
3509 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3510 struct kib_peer_ni *peer_ni = NULL;
3512 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3513 struct kib_conn, ibc_list);
3514 list_del(&conn->ibc_list);
3515 if (conn->ibc_reconnect) {
3516 peer_ni = conn->ibc_peer;
3517 kiblnd_peer_addref(peer_ni);
3520 spin_unlock_irqrestore(lock, flags);
3523 kiblnd_destroy_conn(conn);
3525 spin_lock_irqsave(lock, flags);
3527 LIBCFS_FREE(conn, sizeof(*conn));
3531 conn->ibc_peer = peer_ni;
3532 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3533 list_add_tail(&conn->ibc_list,
3534 &kiblnd_data.kib_reconn_list);
3536 list_add_tail(&conn->ibc_list,
3537 &kiblnd_data.kib_reconn_wait);
3540 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3541 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3542 struct kib_conn, ibc_list);
3543 list_del(&conn->ibc_list);
3545 spin_unlock_irqrestore(lock, flags);
3548 kiblnd_disconnect_conn(conn);
3549 kiblnd_conn_decref(conn);
3551 spin_lock_irqsave(lock, flags);
3554 while (reconn < KIB_RECONN_BREAK) {
3555 if (kiblnd_data.kib_reconn_sec !=
3556 ktime_get_real_seconds()) {
3557 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3558 list_splice_init(&kiblnd_data.kib_reconn_wait,
3559 &kiblnd_data.kib_reconn_list);
3562 if (list_empty(&kiblnd_data.kib_reconn_list))
3565 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3566 struct kib_conn, ibc_list);
3567 list_del(&conn->ibc_list);
3569 spin_unlock_irqrestore(lock, flags);
3572 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3573 kiblnd_peer_decref(conn->ibc_peer);
3574 LIBCFS_FREE(conn, sizeof(*conn));
3576 spin_lock_irqsave(lock, flags);
3579 /* careful with the jiffy wrap... */
3580 timeout = (int)(deadline - jiffies);
3584 int chunk = kiblnd_data.kib_peer_hash_size;
3585 unsigned int lnd_timeout;
3587 spin_unlock_irqrestore(lock, flags);
3590 /* Time to check for RDMA timeouts on a few more
3591 * peers: I do checks every 'p' seconds on a
3592 * proportion of the peer_ni table and I need to check
3593 * every connection 'n' times within a timeout
3594 * interval, to ensure I detect a timeout on any
3595 * connection within (n+1)/n times the timeout
3598 lnd_timeout = lnet_get_lnd_timeout();
3599 if (lnd_timeout > n * p)
3600 chunk = (chunk * n * p) / lnd_timeout;
3604 for (i = 0; i < chunk; i++) {
3605 kiblnd_check_conns(peer_index);
3606 peer_index = (peer_index + 1) %
3607 kiblnd_data.kib_peer_hash_size;
3610 deadline += cfs_time_seconds(p);
3611 spin_lock_irqsave(lock, flags);
3617 /* Nothing to do for 'timeout' */
3618 set_current_state(TASK_INTERRUPTIBLE);
3619 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3620 spin_unlock_irqrestore(lock, flags);
3622 schedule_timeout(timeout);
3624 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3625 spin_lock_irqsave(lock, flags);
3628 spin_unlock_irqrestore(lock, flags);
3630 kiblnd_thread_fini();
3635 kiblnd_qp_event(struct ib_event *event, void *arg)
3637 struct kib_conn *conn = arg;
3639 switch (event->event) {
3640 case IB_EVENT_COMM_EST:
3641 CDEBUG(D_NET, "%s established\n",
3642 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3643 /* We received a packet but connection isn't established
3644 * probably handshake packet was lost, so free to
3645 * force make connection established */
3646 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3649 case IB_EVENT_PORT_ERR:
3650 case IB_EVENT_DEVICE_FATAL:
3651 CERROR("Fatal device error for NI %s\n",
3652 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3653 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
3656 case IB_EVENT_PORT_ACTIVE:
3657 CERROR("Port reactivated for NI %s\n",
3658 libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
3659 atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
3663 CERROR("%s: Async QP event type %d\n",
3664 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3670 kiblnd_complete (struct ib_wc *wc)
3672 switch (kiblnd_wreqid2type(wc->wr_id)) {
3677 if (wc->status != IB_WC_SUCCESS &&
3678 wc->status != IB_WC_WR_FLUSH_ERR)
3679 CNETERR("FastReg failed: %d\n", wc->status);
3682 case IBLND_WID_RDMA:
3683 /* We only get RDMA completion notification if it fails. All
3684 * subsequent work items, including the final SEND will fail
3685 * too. However we can't print out any more info about the
3686 * failing RDMA because 'tx' might be back on the idle list or
3687 * even reused already if we didn't manage to post all our work
3689 CNETERR("RDMA (tx: %p) failed: %d\n",
3690 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3694 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3698 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3705 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3707 /* NB I'm not allowed to schedule this conn once its refcount has
3708 * reached 0. Since fundamentally I'm racing with scheduler threads
3709 * consuming my CQ I could be called after all completions have
3710 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3711 * and this CQ is about to be destroyed so I NOOP. */
3712 struct kib_conn *conn = arg;
3713 struct kib_sched_info *sched = conn->ibc_sched;
3714 unsigned long flags;
3716 LASSERT(cq == conn->ibc_cq);
3718 spin_lock_irqsave(&sched->ibs_lock, flags);
3720 conn->ibc_ready = 1;
3722 if (!conn->ibc_scheduled &&
3723 (conn->ibc_nrx > 0 ||
3724 conn->ibc_nsends_posted > 0)) {
3725 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3726 conn->ibc_scheduled = 1;
3727 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3729 if (waitqueue_active(&sched->ibs_waitq))
3730 wake_up(&sched->ibs_waitq);
3733 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3737 kiblnd_cq_event(struct ib_event *event, void *arg)
3739 struct kib_conn *conn = arg;
3741 CERROR("%s: async CQ event type %d\n",
3742 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3746 kiblnd_scheduler(void *arg)
3748 long id = (long)arg;
3749 struct kib_sched_info *sched;
3750 struct kib_conn *conn;
3751 wait_queue_entry_t wait;
3752 unsigned long flags;
3758 init_waitqueue_entry(&wait, current);
3760 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3762 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3764 CWARN("Unable to bind on CPU partition %d, please verify "
3765 "whether all CPUs are healthy and reload modules if "
3766 "necessary, otherwise your system might under risk of "
3767 "low performance\n", sched->ibs_cpt);
3770 spin_lock_irqsave(&sched->ibs_lock, flags);
3772 while (!kiblnd_data.kib_shutdown) {
3773 if (busy_loops++ >= IBLND_RESCHED) {
3774 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3779 spin_lock_irqsave(&sched->ibs_lock, flags);
3784 if (!list_empty(&sched->ibs_conns)) {
3785 conn = list_entry(sched->ibs_conns.next,
3786 struct kib_conn, ibc_sched_list);
3787 /* take over kib_sched_conns' ref on conn... */
3788 LASSERT(conn->ibc_scheduled);
3789 list_del(&conn->ibc_sched_list);
3790 conn->ibc_ready = 0;
3792 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3794 wc.wr_id = IBLND_WID_INVAL;
3796 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3798 rc = ib_req_notify_cq(conn->ibc_cq,
3801 CWARN("%s: ib_req_notify_cq failed: %d, "
3802 "closing connection\n",
3803 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3804 kiblnd_close_conn(conn, -EIO);
3805 kiblnd_conn_decref(conn);
3806 spin_lock_irqsave(&sched->ibs_lock,
3811 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3814 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3816 "ib_poll_cq (rc: %d) returned invalid "
3817 "wr_id, opcode %d, status: %d, "
3818 "vendor_err: %d, conn: %s status: %d\n"
3819 "please upgrade firmware and OFED or "
3820 "contact vendor.\n", rc,
3821 wc.opcode, wc.status, wc.vendor_err,
3822 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3828 CWARN("%s: ib_poll_cq failed: %d, "
3829 "closing connection\n",
3830 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3832 kiblnd_close_conn(conn, -EIO);
3833 kiblnd_conn_decref(conn);
3834 spin_lock_irqsave(&sched->ibs_lock, flags);
3838 spin_lock_irqsave(&sched->ibs_lock, flags);
3840 if (rc != 0 || conn->ibc_ready) {
3841 /* There may be another completion waiting; get
3842 * another scheduler to check while I handle
3844 /* +1 ref for sched_conns */
3845 kiblnd_conn_addref(conn);
3846 list_add_tail(&conn->ibc_sched_list,
3848 if (waitqueue_active(&sched->ibs_waitq))
3849 wake_up(&sched->ibs_waitq);
3851 conn->ibc_scheduled = 0;
3855 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3856 kiblnd_complete(&wc);
3858 spin_lock_irqsave(&sched->ibs_lock, flags);
3861 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3868 set_current_state(TASK_INTERRUPTIBLE);
3869 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3870 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3875 remove_wait_queue(&sched->ibs_waitq, &wait);
3876 set_current_state(TASK_RUNNING);
3877 spin_lock_irqsave(&sched->ibs_lock, flags);
3880 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3882 kiblnd_thread_fini();
3887 kiblnd_failover_thread(void *arg)
3889 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3890 struct kib_dev *dev;
3891 struct net *ns = arg;
3892 wait_queue_entry_t wait;
3893 unsigned long flags;
3896 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3898 init_waitqueue_entry(&wait, current);
3899 write_lock_irqsave(glock, flags);
3901 while (!kiblnd_data.kib_shutdown) {
3902 int do_failover = 0;
3905 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3907 if (ktime_get_seconds() < dev->ibd_next_failover)
3914 list_del_init(&dev->ibd_fail_list);
3915 dev->ibd_failover = 1;
3916 write_unlock_irqrestore(glock, flags);
3918 rc = kiblnd_dev_failover(dev, ns);
3920 write_lock_irqsave(glock, flags);
3922 LASSERT (dev->ibd_failover);
3923 dev->ibd_failover = 0;
3924 if (rc >= 0) { /* Device is OK or failover succeed */
3925 dev->ibd_next_failover = ktime_get_seconds() + 3;
3929 /* failed to failover, retry later */
3930 dev->ibd_next_failover = ktime_get_seconds() +
3931 min(dev->ibd_failed_failover, 10);
3932 if (kiblnd_dev_can_failover(dev)) {
3933 list_add_tail(&dev->ibd_fail_list,
3934 &kiblnd_data.kib_failed_devs);
3940 /* long sleep if no more pending failover */
3941 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3943 set_current_state(TASK_INTERRUPTIBLE);
3944 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3945 write_unlock_irqrestore(glock, flags);
3947 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3948 cfs_time_seconds(1));
3949 set_current_state(TASK_RUNNING);
3950 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3951 write_lock_irqsave(glock, flags);
3953 if (!long_sleep || rc != 0)
3956 /* have a long sleep, routine check all active devices,
3957 * we need checking like this because if there is not active
3958 * connection on the dev and no SEND from local, we may listen
3959 * on wrong HCA for ever while there is a bonding failover */
3960 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3961 if (kiblnd_dev_can_failover(dev)) {
3962 list_add_tail(&dev->ibd_fail_list,
3963 &kiblnd_data.kib_failed_devs);
3968 write_unlock_irqrestore(glock, flags);
3970 kiblnd_thread_fini();