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(kib_peer_ni_t *peer_ni);
42 static void kiblnd_peer_connect_failed(kib_peer_ni_t *peer_ni, int active, int error);
43 static void kiblnd_init_tx_msg(struct lnet_ni *ni, kib_tx_t *tx,
44 int type, int body_nob);
45 static int kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
46 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie);
47 static void kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn);
48 static void kiblnd_queue_tx(kib_tx_t *tx, kib_conn_t *conn);
50 static void kiblnd_unmap_tx(kib_tx_t *tx);
51 static void kiblnd_check_sends_locked(kib_conn_t *conn);
54 kiblnd_tx_done(kib_tx_t *tx)
56 struct lnet_msg *lntmsg[2];
60 LASSERT (!in_interrupt());
61 LASSERT (!tx->tx_queued); /* mustn't be queued for sending */
62 LASSERT (tx->tx_sending == 0); /* mustn't be awaiting sent callback */
63 LASSERT (!tx->tx_waiting); /* mustn't be awaiting peer_ni response */
64 LASSERT (tx->tx_pool != NULL);
68 /* tx may have up to 2 lnet msgs to finalise */
69 lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
70 lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
73 if (tx->tx_conn != NULL) {
74 kiblnd_conn_decref(tx->tx_conn);
78 tx->tx_nwrq = tx->tx_nsge = 0;
81 kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
83 /* delay finalize until my descs have been freed */
84 for (i = 0; i < 2; i++) {
85 if (lntmsg[i] == NULL)
88 lnet_finalize(lntmsg[i], rc);
93 kiblnd_txlist_done(struct list_head *txlist, int status)
97 while (!list_empty(txlist)) {
98 tx = list_entry(txlist->next, kib_tx_t, tx_list);
100 list_del(&tx->tx_list);
103 tx->tx_status = status;
109 kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
111 kib_net_t *net = (kib_net_t *)ni->ni_data;
112 struct list_head *node;
114 kib_tx_poolset_t *tps;
116 tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
117 node = kiblnd_pool_alloc_node(&tps->tps_poolset);
120 tx = container_of(node, kib_tx_t, tx_list);
122 LASSERT (tx->tx_nwrq == 0);
123 LASSERT (!tx->tx_queued);
124 LASSERT (tx->tx_sending == 0);
125 LASSERT (!tx->tx_waiting);
126 LASSERT (tx->tx_status == 0);
127 LASSERT (tx->tx_conn == NULL);
128 LASSERT (tx->tx_lntmsg[0] == NULL);
129 LASSERT (tx->tx_lntmsg[1] == NULL);
130 LASSERT (tx->tx_nfrags == 0);
138 kiblnd_drop_rx(kib_rx_t *rx)
140 kib_conn_t *conn = rx->rx_conn;
141 struct kib_sched_info *sched = conn->ibc_sched;
144 spin_lock_irqsave(&sched->ibs_lock, flags);
145 LASSERT(conn->ibc_nrx > 0);
147 spin_unlock_irqrestore(&sched->ibs_lock, flags);
149 kiblnd_conn_decref(conn);
153 kiblnd_post_rx (kib_rx_t *rx, int credit)
155 kib_conn_t *conn = rx->rx_conn;
156 kib_net_t *net = conn->ibc_peer->ibp_ni->ni_data;
157 struct ib_recv_wr *bad_wrq = NULL;
158 #ifdef HAVE_IB_GET_DMA_MR
159 struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
163 LASSERT (net != NULL);
164 LASSERT (!in_interrupt());
165 LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
166 credit == IBLND_POSTRX_PEER_CREDIT ||
167 credit == IBLND_POSTRX_RSRVD_CREDIT);
168 #ifdef HAVE_IB_GET_DMA_MR
171 rx->rx_sge.lkey = mr->lkey;
173 rx->rx_sge.lkey = conn->ibc_hdev->ibh_pd->local_dma_lkey;
175 rx->rx_sge.addr = rx->rx_msgaddr;
176 rx->rx_sge.length = IBLND_MSG_SIZE;
178 rx->rx_wrq.next = NULL;
179 rx->rx_wrq.sg_list = &rx->rx_sge;
180 rx->rx_wrq.num_sge = 1;
181 rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);
183 LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
184 LASSERT (rx->rx_nob >= 0); /* not posted */
186 if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
187 kiblnd_drop_rx(rx); /* No more posts for this rx */
191 rx->rx_nob = -1; /* flag posted */
193 /* NB: need an extra reference after ib_post_recv because we don't
194 * own this rx (and rx::rx_conn) anymore, LU-5678.
196 kiblnd_conn_addref(conn);
197 rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
198 if (unlikely(rc != 0)) {
199 CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
200 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
204 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
207 if (unlikely(rc != 0)) {
208 kiblnd_close_conn(conn, rc);
209 kiblnd_drop_rx(rx); /* No more posts for this rx */
213 if (credit == IBLND_POSTRX_NO_CREDIT)
216 spin_lock(&conn->ibc_lock);
217 if (credit == IBLND_POSTRX_PEER_CREDIT)
218 conn->ibc_outstanding_credits++;
220 conn->ibc_reserved_credits++;
221 kiblnd_check_sends_locked(conn);
222 spin_unlock(&conn->ibc_lock);
225 kiblnd_conn_decref(conn);
230 kiblnd_find_waiting_tx_locked(kib_conn_t *conn, int txtype, __u64 cookie)
232 struct list_head *tmp;
234 list_for_each(tmp, &conn->ibc_active_txs) {
235 kib_tx_t *tx = list_entry(tmp, kib_tx_t, tx_list);
237 LASSERT(!tx->tx_queued);
238 LASSERT(tx->tx_sending != 0 || tx->tx_waiting);
240 if (tx->tx_cookie != cookie)
243 if (tx->tx_waiting &&
244 tx->tx_msg->ibm_type == txtype)
247 CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
248 tx->tx_waiting ? "" : "NOT ",
249 tx->tx_msg->ibm_type, txtype);
255 kiblnd_handle_completion(kib_conn_t *conn, int txtype, int status, __u64 cookie)
258 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
261 spin_lock(&conn->ibc_lock);
263 tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
265 spin_unlock(&conn->ibc_lock);
267 CWARN("Unmatched completion type %x cookie %#llx from %s\n",
268 txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
269 kiblnd_close_conn(conn, -EPROTO);
273 if (tx->tx_status == 0) { /* success so far */
274 if (status < 0) { /* failed? */
275 tx->tx_status = status;
276 } else if (txtype == IBLND_MSG_GET_REQ) {
277 lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
283 idle = !tx->tx_queued && (tx->tx_sending == 0);
285 list_del(&tx->tx_list);
287 spin_unlock(&conn->ibc_lock);
294 kiblnd_send_completion(kib_conn_t *conn, int type, int status, __u64 cookie)
296 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
297 kib_tx_t *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
300 CERROR("Can't get tx for completion %x for %s\n",
301 type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
305 tx->tx_msg->ibm_u.completion.ibcm_status = status;
306 tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
307 kiblnd_init_tx_msg(ni, tx, type, sizeof(kib_completion_msg_t));
309 kiblnd_queue_tx(tx, conn);
313 kiblnd_handle_rx (kib_rx_t *rx)
315 kib_msg_t *msg = rx->rx_msg;
316 kib_conn_t *conn = rx->rx_conn;
317 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
318 int credits = msg->ibm_credits;
324 LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);
326 CDEBUG (D_NET, "Received %x[%d] from %s\n",
327 msg->ibm_type, credits,
328 libcfs_nid2str(conn->ibc_peer->ibp_nid));
331 /* Have I received credits that will let me send? */
332 spin_lock(&conn->ibc_lock);
334 if (conn->ibc_credits + credits >
335 conn->ibc_queue_depth) {
336 rc2 = conn->ibc_credits;
337 spin_unlock(&conn->ibc_lock);
339 CERROR("Bad credits from %s: %d + %d > %d\n",
340 libcfs_nid2str(conn->ibc_peer->ibp_nid),
342 conn->ibc_queue_depth);
344 kiblnd_close_conn(conn, -EPROTO);
345 kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
349 conn->ibc_credits += credits;
351 /* This ensures the credit taken by NOOP can be returned */
352 if (msg->ibm_type == IBLND_MSG_NOOP &&
353 !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
354 conn->ibc_outstanding_credits++;
356 kiblnd_check_sends_locked(conn);
357 spin_unlock(&conn->ibc_lock);
360 switch (msg->ibm_type) {
362 CERROR("Bad IBLND message type %x from %s\n",
363 msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
364 post_credit = IBLND_POSTRX_NO_CREDIT;
369 if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
370 post_credit = IBLND_POSTRX_NO_CREDIT;
374 if (credits != 0) /* credit already posted */
375 post_credit = IBLND_POSTRX_NO_CREDIT;
376 else /* a keepalive NOOP */
377 post_credit = IBLND_POSTRX_PEER_CREDIT;
380 case IBLND_MSG_IMMEDIATE:
381 post_credit = IBLND_POSTRX_DONT_POST;
382 rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
383 msg->ibm_srcnid, rx, 0);
384 if (rc < 0) /* repost on error */
385 post_credit = IBLND_POSTRX_PEER_CREDIT;
388 case IBLND_MSG_PUT_REQ:
389 post_credit = IBLND_POSTRX_DONT_POST;
390 rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
391 msg->ibm_srcnid, rx, 1);
392 if (rc < 0) /* repost on error */
393 post_credit = IBLND_POSTRX_PEER_CREDIT;
396 case IBLND_MSG_PUT_NAK:
397 CWARN ("PUT_NACK from %s\n",
398 libcfs_nid2str(conn->ibc_peer->ibp_nid));
399 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
400 kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
401 msg->ibm_u.completion.ibcm_status,
402 msg->ibm_u.completion.ibcm_cookie);
405 case IBLND_MSG_PUT_ACK:
406 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
408 spin_lock(&conn->ibc_lock);
409 tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
410 msg->ibm_u.putack.ibpam_src_cookie);
412 list_del(&tx->tx_list);
413 spin_unlock(&conn->ibc_lock);
416 CERROR("Unmatched PUT_ACK from %s\n",
417 libcfs_nid2str(conn->ibc_peer->ibp_nid));
422 LASSERT (tx->tx_waiting);
423 /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
424 * (a) I can overwrite tx_msg since my peer_ni has received it!
425 * (b) tx_waiting set tells tx_complete() it's not done. */
427 tx->tx_nwrq = tx->tx_nsge = 0; /* overwrite PUT_REQ */
429 rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
430 kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
431 &msg->ibm_u.putack.ibpam_rd,
432 msg->ibm_u.putack.ibpam_dst_cookie);
434 CERROR("Can't setup rdma for PUT to %s: %d\n",
435 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);
437 spin_lock(&conn->ibc_lock);
438 tx->tx_waiting = 0; /* clear waiting and queue atomically */
439 kiblnd_queue_tx_locked(tx, conn);
440 spin_unlock(&conn->ibc_lock);
443 case IBLND_MSG_PUT_DONE:
444 post_credit = IBLND_POSTRX_PEER_CREDIT;
445 kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
446 msg->ibm_u.completion.ibcm_status,
447 msg->ibm_u.completion.ibcm_cookie);
450 case IBLND_MSG_GET_REQ:
451 post_credit = IBLND_POSTRX_DONT_POST;
452 rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
453 msg->ibm_srcnid, rx, 1);
454 if (rc < 0) /* repost on error */
455 post_credit = IBLND_POSTRX_PEER_CREDIT;
458 case IBLND_MSG_GET_DONE:
459 post_credit = IBLND_POSTRX_RSRVD_CREDIT;
460 kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
461 msg->ibm_u.completion.ibcm_status,
462 msg->ibm_u.completion.ibcm_cookie);
466 if (rc < 0) /* protocol error */
467 kiblnd_close_conn(conn, rc);
469 if (post_credit != IBLND_POSTRX_DONT_POST)
470 kiblnd_post_rx(rx, post_credit);
474 kiblnd_rx_complete (kib_rx_t *rx, int status, int nob)
476 kib_msg_t *msg = rx->rx_msg;
477 kib_conn_t *conn = rx->rx_conn;
478 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
479 kib_net_t *net = ni->ni_data;
483 LASSERT (net != NULL);
484 LASSERT (rx->rx_nob < 0); /* was posted */
485 rx->rx_nob = 0; /* isn't now */
487 if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
490 if (status != IB_WC_SUCCESS) {
491 CNETERR("Rx from %s failed: %d\n",
492 libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
499 rc = kiblnd_unpack_msg(msg, rx->rx_nob);
501 CERROR ("Error %d unpacking rx from %s\n",
502 rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
506 if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
507 msg->ibm_dstnid != ni->ni_nid ||
508 msg->ibm_srcstamp != conn->ibc_incarnation ||
509 msg->ibm_dststamp != net->ibn_incarnation) {
510 CERROR ("Stale rx from %s\n",
511 libcfs_nid2str(conn->ibc_peer->ibp_nid));
516 /* set time last known alive */
517 kiblnd_peer_alive(conn->ibc_peer);
519 /* racing with connection establishment/teardown! */
520 if (conn->ibc_state < IBLND_CONN_ESTABLISHED)
523 kiblnd_handle_rx(rx);
527 CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
528 kiblnd_close_conn(conn, err);
530 kiblnd_drop_rx(rx); /* Don't re-post rx. */
534 kiblnd_fmr_map_tx(kib_net_t *net, kib_tx_t *tx, kib_rdma_desc_t *rd, __u32 nob)
538 kib_fmr_poolset_t *fps;
543 LASSERT(tx->tx_pool != NULL);
544 LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);
547 hdev = tx->tx_pool->tpo_hdev;
548 cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;
551 * If we're dealing with FastReg, but the device doesn't
552 * support GAPS and the tx has GAPS, then there is no real point
553 * in trying to map the memory, because it'll just fail. So
554 * preemptively fail with an appropriate message
556 if ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED) &&
557 !(dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT) &&
559 CERROR("Using FastReg with no GAPS support, but tx has gaps. "
560 "Try setting use_fastreg_gaps to 1\n");
561 return -EPROTONOSUPPORT;
565 * FMR does not support gaps but the tx has gaps then
566 * we should make sure that the number of fragments we'll be sending
567 * over fits within the number of fragments negotiated on the
568 * connection, otherwise, we won't be able to RDMA the data.
569 * We need to maintain the number of fragments negotiation on the
570 * connection for backwards compatibility.
572 if (tx->tx_gaps && (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)) {
574 tx->tx_conn->ibc_max_frags <= rd->rd_nfrags) {
575 CERROR("TX number of frags (%d) is <= than connection"
576 " number of frags (%d). Consider setting peer's"
577 " map_on_demand to 256\n", tx->tx_nfrags,
578 tx->tx_conn->ibc_max_frags);
583 fps = net->ibn_fmr_ps[cpt];
584 rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
586 CERROR("Can't map %u pages: %d\n", nob, rc);
591 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
594 rd->rd_key = tx->tx_fmr.fmr_key;
596 * for FastReg or FMR with no gaps we can accumulate all
597 * the fragments in one FastReg or FMR fragment.
599 if (((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED) && !tx->tx_gaps) ||
600 (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
601 /* FMR requires zero based address */
602 if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
603 rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
604 rd->rd_frags[0].rf_nob = nob;
608 * We're transmitting with gaps using FMR.
609 * We'll need to use multiple fragments and identify the
610 * zero based address of each fragment.
612 for (i = 0; i < rd->rd_nfrags; i++) {
613 rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
614 rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
622 kiblnd_unmap_tx(kib_tx_t *tx)
624 if (tx->tx_fmr.fmr_pfmr || tx->tx_fmr.fmr_frd)
625 kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);
627 if (tx->tx_nfrags != 0) {
628 kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
629 tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
634 #ifdef HAVE_IB_GET_DMA_MR
635 static struct ib_mr *
636 kiblnd_find_rd_dma_mr(struct lnet_ni *ni, kib_rdma_desc_t *rd)
638 kib_net_t *net = ni->ni_data;
639 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
640 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
642 tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
645 * if map-on-demand is turned on and the device supports
646 * either FMR or FastReg then use that. Otherwise use global
647 * memory regions. If that's not available either, then you're
648 * dead in the water and fail the operation.
650 if (tunables->lnd_map_on_demand &&
651 (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED ||
652 net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED))
656 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
657 * in the call chain. The mapping will fail with appropriate error
660 return hdev->ibh_mrs;
665 kiblnd_map_tx(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd, int nfrags)
667 kib_net_t *net = ni->ni_data;
668 kib_hca_dev_t *hdev = net->ibn_dev->ibd_hdev;
669 #ifdef HAVE_IB_GET_DMA_MR
670 struct ib_mr *mr = NULL;
675 /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
677 tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
678 tx->tx_nfrags = nfrags;
680 rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
681 tx->tx_nfrags, tx->tx_dmadir);
683 for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
684 rd->rd_frags[i].rf_nob = kiblnd_sg_dma_len(
685 hdev->ibh_ibdev, &tx->tx_frags[i]);
686 rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
687 hdev->ibh_ibdev, &tx->tx_frags[i]);
688 nob += rd->rd_frags[i].rf_nob;
691 #ifdef HAVE_IB_GET_DMA_MR
692 mr = kiblnd_find_rd_dma_mr(ni, rd);
694 /* found pre-mapping MR */
695 rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
700 if (net->ibn_fmr_ps != NULL)
701 return kiblnd_fmr_map_tx(net, tx, rd, nob);
707 kiblnd_setup_rd_iov(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
708 unsigned int niov, struct kvec *iov, int offset, int nob)
710 kib_net_t *net = ni->ni_data;
712 struct scatterlist *sg;
719 LASSERT (net != NULL);
721 while (offset >= iov->iov_len) {
722 offset -= iov->iov_len;
732 vaddr = ((unsigned long)iov->iov_base) + offset;
733 page_offset = vaddr & (PAGE_SIZE - 1);
734 page = lnet_kvaddr_to_page(vaddr);
736 CERROR("Can't find page\n");
740 fragnob = min((int)(iov->iov_len - offset), nob);
741 fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);
743 if ((fragnob < (int)PAGE_SIZE - page_offset) && (niov > 1)) {
744 CDEBUG(D_NET, "fragnob %d < available page %d: with"
745 " remaining %d iovs\n",
746 fragnob, (int)PAGE_SIZE - page_offset, niov);
750 sg_set_page(sg, page, fragnob, page_offset);
753 CERROR("lacking enough sg entries to map tx\n");
757 if (offset + fragnob < iov->iov_len) {
767 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
771 kiblnd_setup_rd_kiov(struct lnet_ni *ni, kib_tx_t *tx, kib_rdma_desc_t *rd,
772 int nkiov, lnet_kiov_t *kiov, int offset, int nob)
774 kib_net_t *net = ni->ni_data;
775 struct scatterlist *sg;
778 CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);
782 LASSERT(net != NULL);
784 while (offset >= kiov->kiov_len) {
785 offset -= kiov->kiov_len;
795 fragnob = min((int)(kiov->kiov_len - offset), nob);
797 if ((fragnob < (int)(kiov->kiov_len - offset)) && nkiov > 1) {
798 CDEBUG(D_NET, "fragnob %d < available page %d: with"
799 " remaining %d kiovs\n",
800 fragnob, (int)(kiov->kiov_len - offset), nkiov);
804 sg_set_page(sg, kiov->kiov_page, fragnob,
805 kiov->kiov_offset + offset);
808 CERROR("lacking enough sg entries to map tx\n");
818 return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
822 kiblnd_post_tx_locked (kib_conn_t *conn, kib_tx_t *tx, int credit)
823 __must_hold(&conn->ibc_lock)
825 kib_msg_t *msg = tx->tx_msg;
826 kib_peer_ni_t *peer_ni = conn->ibc_peer;
827 int ver = conn->ibc_version;
831 LASSERT(tx->tx_queued);
832 /* We rely on this for QP sizing */
833 LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
834 LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);
836 LASSERT(credit == 0 || credit == 1);
837 LASSERT(conn->ibc_outstanding_credits >= 0);
838 LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
839 LASSERT(conn->ibc_credits >= 0);
840 LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);
842 if (conn->ibc_nsends_posted ==
843 conn->ibc_queue_depth) {
844 /* tx completions outstanding... */
845 CDEBUG(D_NET, "%s: posted enough\n",
846 libcfs_nid2str(peer_ni->ibp_nid));
850 if (credit != 0 && conn->ibc_credits == 0) { /* no credits */
851 CDEBUG(D_NET, "%s: no credits\n",
852 libcfs_nid2str(peer_ni->ibp_nid));
856 if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
857 conn->ibc_credits == 1 && /* last credit reserved */
858 msg->ibm_type != IBLND_MSG_NOOP) { /* for NOOP */
859 CDEBUG(D_NET, "%s: not using last credit\n",
860 libcfs_nid2str(peer_ni->ibp_nid));
864 /* NB don't drop ibc_lock before bumping tx_sending */
865 list_del(&tx->tx_list);
868 if (msg->ibm_type == IBLND_MSG_NOOP &&
869 (!kiblnd_need_noop(conn) || /* redundant NOOP */
870 (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
871 conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
872 /* OK to drop when posted enough NOOPs, since
873 * kiblnd_check_sends_locked will queue NOOP again when
874 * posted NOOPs complete */
875 spin_unlock(&conn->ibc_lock);
877 spin_lock(&conn->ibc_lock);
878 CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
879 libcfs_nid2str(peer_ni->ibp_nid),
880 conn->ibc_noops_posted);
884 kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
885 peer_ni->ibp_nid, conn->ibc_incarnation);
887 conn->ibc_credits -= credit;
888 conn->ibc_outstanding_credits = 0;
889 conn->ibc_nsends_posted++;
890 if (msg->ibm_type == IBLND_MSG_NOOP)
891 conn->ibc_noops_posted++;
893 /* CAVEAT EMPTOR! This tx could be the PUT_DONE of an RDMA
894 * PUT. If so, it was first queued here as a PUT_REQ, sent and
895 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
896 * and then re-queued here. It's (just) possible that
897 * tx_sending is non-zero if we've not done the tx_complete()
898 * from the first send; hence the ++ rather than = below. */
900 list_add(&tx->tx_list, &conn->ibc_active_txs);
902 /* I'm still holding ibc_lock! */
903 if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
905 } else if (tx->tx_pool->tpo_pool.po_failed ||
906 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
907 /* close_conn will launch failover */
910 struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
911 struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
912 struct ib_send_wr *wr = &tx->tx_wrq[0].wr;
915 if (!frd->frd_valid) {
916 wr = &frd->frd_inv_wr.wr;
917 wr->next = &frd->frd_fastreg_wr.wr;
919 wr = &frd->frd_fastreg_wr.wr;
921 frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
924 LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
925 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
926 bad->wr_id, bad->opcode, bad->send_flags,
927 libcfs_nid2str(conn->ibc_peer->ibp_nid));
930 rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
933 conn->ibc_last_send = ktime_get();
938 /* NB credits are transferred in the actual
939 * message, which can only be the last work item */
940 conn->ibc_credits += credit;
941 conn->ibc_outstanding_credits += msg->ibm_credits;
942 conn->ibc_nsends_posted--;
943 if (msg->ibm_type == IBLND_MSG_NOOP)
944 conn->ibc_noops_posted--;
950 done = (tx->tx_sending == 0);
952 list_del(&tx->tx_list);
954 spin_unlock(&conn->ibc_lock);
956 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
957 CERROR("Error %d posting transmit to %s\n",
958 rc, libcfs_nid2str(peer_ni->ibp_nid));
960 CDEBUG(D_NET, "Error %d posting transmit to %s\n",
961 rc, libcfs_nid2str(peer_ni->ibp_nid));
963 kiblnd_close_conn(conn, rc);
968 spin_lock(&conn->ibc_lock);
974 kiblnd_check_sends_locked(kib_conn_t *conn)
976 int ver = conn->ibc_version;
977 struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
980 /* Don't send anything until after the connection is established */
981 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
982 CDEBUG(D_NET, "%s too soon\n",
983 libcfs_nid2str(conn->ibc_peer->ibp_nid));
987 LASSERT(conn->ibc_nsends_posted <=
988 conn->ibc_queue_depth);
989 LASSERT (!IBLND_OOB_CAPABLE(ver) ||
990 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
991 LASSERT (conn->ibc_reserved_credits >= 0);
993 while (conn->ibc_reserved_credits > 0 &&
994 !list_empty(&conn->ibc_tx_queue_rsrvd)) {
995 tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
997 list_del(&tx->tx_list);
998 list_add_tail(&tx->tx_list, &conn->ibc_tx_queue);
999 conn->ibc_reserved_credits--;
1002 if (kiblnd_need_noop(conn)) {
1003 spin_unlock(&conn->ibc_lock);
1005 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1007 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);
1009 spin_lock(&conn->ibc_lock);
1011 kiblnd_queue_tx_locked(tx, conn);
1017 if (!list_empty(&conn->ibc_tx_queue_nocred)) {
1019 tx = list_entry(conn->ibc_tx_queue_nocred.next,
1021 } else if (!list_empty(&conn->ibc_tx_noops)) {
1022 LASSERT (!IBLND_OOB_CAPABLE(ver));
1024 tx = list_entry(conn->ibc_tx_noops.next,
1026 } else if (!list_empty(&conn->ibc_tx_queue)) {
1028 tx = list_entry(conn->ibc_tx_queue.next,
1033 if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
1039 kiblnd_tx_complete (kib_tx_t *tx, int status)
1041 int failed = (status != IB_WC_SUCCESS);
1042 kib_conn_t *conn = tx->tx_conn;
1045 LASSERT (tx->tx_sending > 0);
1048 if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
1049 CNETERR("Tx -> %s cookie %#llx"
1050 " sending %d waiting %d: failed %d\n",
1051 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1052 tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
1055 kiblnd_close_conn(conn, -EIO);
1057 kiblnd_peer_alive(conn->ibc_peer);
1060 spin_lock(&conn->ibc_lock);
1062 /* I could be racing with rdma completion. Whoever makes 'tx' idle
1063 * gets to free it, which also drops its ref on 'conn'. */
1066 conn->ibc_nsends_posted--;
1067 if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
1068 conn->ibc_noops_posted--;
1071 tx->tx_waiting = 0; /* don't wait for peer_ni */
1072 tx->tx_status = -EIO;
1075 idle = (tx->tx_sending == 0) && /* This is the final callback */
1076 !tx->tx_waiting && /* Not waiting for peer_ni */
1077 !tx->tx_queued; /* Not re-queued (PUT_DONE) */
1079 list_del(&tx->tx_list);
1081 kiblnd_check_sends_locked(conn);
1082 spin_unlock(&conn->ibc_lock);
1089 kiblnd_init_tx_msg(struct lnet_ni *ni, kib_tx_t *tx, int type, int body_nob)
1091 kib_hca_dev_t *hdev = tx->tx_pool->tpo_hdev;
1092 struct ib_sge *sge = &tx->tx_msgsge;
1093 struct ib_rdma_wr *wrq;
1094 int nob = offsetof(kib_msg_t, ibm_u) + body_nob;
1095 #ifdef HAVE_IB_GET_DMA_MR
1096 struct ib_mr *mr = hdev->ibh_mrs;
1099 LASSERT(tx->tx_nwrq >= 0);
1100 LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
1101 LASSERT(nob <= IBLND_MSG_SIZE);
1102 #ifdef HAVE_IB_GET_DMA_MR
1103 LASSERT(mr != NULL);
1106 kiblnd_init_msg(tx->tx_msg, type, body_nob);
1108 #ifdef HAVE_IB_GET_DMA_MR
1109 sge->lkey = mr->lkey;
1111 sge->lkey = hdev->ibh_pd->local_dma_lkey;
1113 sge->addr = tx->tx_msgaddr;
1116 wrq = &tx->tx_wrq[tx->tx_nwrq];
1117 memset(wrq, 0, sizeof(*wrq));
1119 wrq->wr.next = NULL;
1120 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
1121 wrq->wr.sg_list = sge;
1122 wrq->wr.num_sge = 1;
1123 wrq->wr.opcode = IB_WR_SEND;
1124 wrq->wr.send_flags = IB_SEND_SIGNALED;
1130 kiblnd_init_rdma(kib_conn_t *conn, kib_tx_t *tx, int type,
1131 int resid, kib_rdma_desc_t *dstrd, __u64 dstcookie)
1133 kib_msg_t *ibmsg = tx->tx_msg;
1134 kib_rdma_desc_t *srcrd = tx->tx_rd;
1135 struct ib_rdma_wr *wrq = NULL;
1143 LASSERT(!in_interrupt());
1144 LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
1145 LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);
1147 for (srcidx = dstidx = wrq_sge = sge_nob = 0;
1148 resid > 0; resid -= sge_nob) {
1151 if (srcidx >= srcrd->rd_nfrags) {
1152 CERROR("Src buffer exhausted: %d frags\n", srcidx);
1157 if (dstidx >= dstrd->rd_nfrags) {
1158 CERROR("Dst buffer exhausted: %d frags\n", dstidx);
1163 if (tx->tx_nwrq >= conn->ibc_max_frags) {
1164 CERROR("RDMA has too many fragments for peer_ni %s (%d), "
1165 "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
1166 libcfs_nid2str(conn->ibc_peer->ibp_nid),
1167 conn->ibc_max_frags,
1168 srcidx, srcrd->rd_nfrags,
1169 dstidx, dstrd->rd_nfrags);
1174 sge_nob = MIN(MIN(kiblnd_rd_frag_size(srcrd, srcidx),
1175 kiblnd_rd_frag_size(dstrd, dstidx)), resid);
1177 sge = &tx->tx_sge[tx->tx_nsge];
1178 sge->addr = kiblnd_rd_frag_addr(srcrd, srcidx);
1179 sge->lkey = kiblnd_rd_frag_key(srcrd, srcidx);
1180 sge->length = sge_nob;
1183 wrq = &tx->tx_wrq[tx->tx_nwrq];
1185 wrq->wr.next = &(wrq + 1)->wr;
1186 wrq->wr.wr_id = kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
1187 wrq->wr.sg_list = sge;
1188 wrq->wr.opcode = IB_WR_RDMA_WRITE;
1189 wrq->wr.send_flags = 0;
1191 #ifdef HAVE_IB_RDMA_WR
1192 wrq->remote_addr = kiblnd_rd_frag_addr(dstrd,
1194 wrq->rkey = kiblnd_rd_frag_key(dstrd,
1197 wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
1199 wrq->wr.wr.rdma.rkey = kiblnd_rd_frag_key(dstrd,
1204 srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
1205 dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);
1208 if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
1210 wrq->wr.num_sge = wrq_sge;
1216 if (rc < 0) /* no RDMA if completing with failure */
1217 tx->tx_nwrq = tx->tx_nsge = 0;
1219 ibmsg->ibm_u.completion.ibcm_status = rc;
1220 ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
1221 kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
1222 type, sizeof (kib_completion_msg_t));
1228 kiblnd_queue_tx_locked(kib_tx_t *tx, kib_conn_t *conn)
1230 struct list_head *q;
1233 LASSERT(tx->tx_nwrq > 0); /* work items set up */
1234 LASSERT(!tx->tx_queued); /* not queued for sending already */
1235 LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1237 timeout_ns = *kiblnd_tunables.kib_timeout * NSEC_PER_SEC;
1239 tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);
1241 if (tx->tx_conn == NULL) {
1242 kiblnd_conn_addref(conn);
1244 LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
1246 /* PUT_DONE first attached to conn as a PUT_REQ */
1247 LASSERT (tx->tx_conn == conn);
1248 LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
1251 switch (tx->tx_msg->ibm_type) {
1255 case IBLND_MSG_PUT_REQ:
1256 case IBLND_MSG_GET_REQ:
1257 q = &conn->ibc_tx_queue_rsrvd;
1260 case IBLND_MSG_PUT_NAK:
1261 case IBLND_MSG_PUT_ACK:
1262 case IBLND_MSG_PUT_DONE:
1263 case IBLND_MSG_GET_DONE:
1264 q = &conn->ibc_tx_queue_nocred;
1267 case IBLND_MSG_NOOP:
1268 if (IBLND_OOB_CAPABLE(conn->ibc_version))
1269 q = &conn->ibc_tx_queue_nocred;
1271 q = &conn->ibc_tx_noops;
1274 case IBLND_MSG_IMMEDIATE:
1275 q = &conn->ibc_tx_queue;
1279 list_add_tail(&tx->tx_list, q);
1283 kiblnd_queue_tx (kib_tx_t *tx, kib_conn_t *conn)
1285 spin_lock(&conn->ibc_lock);
1286 kiblnd_queue_tx_locked(tx, conn);
1287 kiblnd_check_sends_locked(conn);
1288 spin_unlock(&conn->ibc_lock);
1291 static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
1292 struct sockaddr_in *srcaddr,
1293 struct sockaddr_in *dstaddr,
1296 unsigned short port;
1299 /* allow the port to be reused */
1300 rc = rdma_set_reuseaddr(cmid, 1);
1302 CERROR("Unable to set reuse on cmid: %d\n", rc);
1306 /* look for a free privileged port */
1307 for (port = PROT_SOCK-1; port > 0; port--) {
1308 srcaddr->sin_port = htons(port);
1309 rc = rdma_resolve_addr(cmid,
1310 (struct sockaddr *)srcaddr,
1311 (struct sockaddr *)dstaddr,
1314 CDEBUG(D_NET, "bound to port %hu\n", port);
1316 } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
1317 CDEBUG(D_NET, "bind to port %hu failed: %d\n",
1324 CERROR("Failed to bind to a free privileged port\n");
1329 kiblnd_connect_peer (kib_peer_ni_t *peer_ni)
1331 struct rdma_cm_id *cmid;
1333 kib_net_t *net = peer_ni->ibp_ni->ni_data;
1334 struct sockaddr_in srcaddr;
1335 struct sockaddr_in dstaddr;
1338 LASSERT (net != NULL);
1339 LASSERT (peer_ni->ibp_connecting > 0);
1341 cmid = kiblnd_rdma_create_id(kiblnd_cm_callback, peer_ni, RDMA_PS_TCP,
1345 CERROR("Can't create CMID for %s: %ld\n",
1346 libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
1352 memset(&srcaddr, 0, sizeof(srcaddr));
1353 srcaddr.sin_family = AF_INET;
1354 srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);
1356 memset(&dstaddr, 0, sizeof(dstaddr));
1357 dstaddr.sin_family = AF_INET;
1358 dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
1359 dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));
1361 kiblnd_peer_addref(peer_ni); /* cmid's ref */
1363 if (*kiblnd_tunables.kib_use_priv_port) {
1364 rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
1365 *kiblnd_tunables.kib_timeout * 1000);
1367 rc = rdma_resolve_addr(cmid,
1368 (struct sockaddr *)&srcaddr,
1369 (struct sockaddr *)&dstaddr,
1370 *kiblnd_tunables.kib_timeout * 1000);
1373 /* Can't initiate address resolution: */
1374 CERROR("Can't resolve addr for %s: %d\n",
1375 libcfs_nid2str(peer_ni->ibp_nid), rc);
1382 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1383 kiblnd_peer_decref(peer_ni); /* cmid's ref */
1384 rdma_destroy_id(cmid);
1387 kiblnd_peer_connect_failed(peer_ni, 1, rc);
1391 kiblnd_reconnect_peer(kib_peer_ni_t *peer_ni)
1393 rwlock_t *glock = &kiblnd_data.kib_global_lock;
1394 char *reason = NULL;
1395 struct list_head txs;
1396 unsigned long flags;
1398 INIT_LIST_HEAD(&txs);
1400 write_lock_irqsave(glock, flags);
1401 if (peer_ni->ibp_reconnecting == 0) {
1402 if (peer_ni->ibp_accepting)
1403 reason = "accepting";
1404 else if (peer_ni->ibp_connecting)
1405 reason = "connecting";
1406 else if (!list_empty(&peer_ni->ibp_conns))
1407 reason = "connected";
1408 else /* connected then closed */
1414 if (peer_ni->ibp_accepting)
1415 CNETERR("Detecting race between accepting and reconnecting\n");
1416 peer_ni->ibp_reconnecting--;
1418 if (!kiblnd_peer_active(peer_ni)) {
1419 list_splice_init(&peer_ni->ibp_tx_queue, &txs);
1420 reason = "unlinked";
1424 peer_ni->ibp_connecting++;
1425 peer_ni->ibp_reconnected++;
1427 write_unlock_irqrestore(glock, flags);
1429 kiblnd_connect_peer(peer_ni);
1433 write_unlock_irqrestore(glock, flags);
1435 CWARN("Abort reconnection of %s: %s\n",
1436 libcfs_nid2str(peer_ni->ibp_nid), reason);
1437 kiblnd_txlist_done(&txs, -ECONNABORTED);
1442 kiblnd_launch_tx(struct lnet_ni *ni, kib_tx_t *tx, lnet_nid_t nid)
1444 kib_peer_ni_t *peer_ni;
1445 kib_peer_ni_t *peer2;
1447 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
1448 unsigned long flags;
1451 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
1453 /* If I get here, I've committed to send, so I complete the tx with
1454 * failure on any problems */
1456 LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
1457 LASSERT (tx == NULL || tx->tx_nwrq > 0); /* work items have been set up */
1459 /* First time, just use a read lock since I expect to find my peer_ni
1461 read_lock_irqsave(g_lock, flags);
1463 peer_ni = kiblnd_find_peer_locked(ni, nid);
1464 if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
1465 /* Found a peer_ni with an established connection */
1466 conn = kiblnd_get_conn_locked(peer_ni);
1467 kiblnd_conn_addref(conn); /* 1 ref for me... */
1469 read_unlock_irqrestore(g_lock, flags);
1472 kiblnd_queue_tx(tx, conn);
1473 kiblnd_conn_decref(conn); /* ...to here */
1477 read_unlock(g_lock);
1478 /* Re-try with a write lock */
1481 peer_ni = kiblnd_find_peer_locked(ni, nid);
1482 if (peer_ni != NULL) {
1483 if (list_empty(&peer_ni->ibp_conns)) {
1484 /* found a peer_ni, but it's still connecting... */
1485 LASSERT(kiblnd_peer_connecting(peer_ni));
1487 list_add_tail(&tx->tx_list,
1488 &peer_ni->ibp_tx_queue);
1489 write_unlock_irqrestore(g_lock, flags);
1491 conn = kiblnd_get_conn_locked(peer_ni);
1492 kiblnd_conn_addref(conn); /* 1 ref for me... */
1494 write_unlock_irqrestore(g_lock, flags);
1497 kiblnd_queue_tx(tx, conn);
1498 kiblnd_conn_decref(conn); /* ...to here */
1503 write_unlock_irqrestore(g_lock, flags);
1505 /* Allocate a peer_ni ready to add to the peer_ni table and retry */
1506 rc = kiblnd_create_peer(ni, &peer_ni, nid);
1508 CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
1510 tx->tx_status = -EHOSTUNREACH;
1517 write_lock_irqsave(g_lock, flags);
1519 peer2 = kiblnd_find_peer_locked(ni, nid);
1520 if (peer2 != NULL) {
1521 if (list_empty(&peer2->ibp_conns)) {
1522 /* found a peer_ni, but it's still connecting... */
1523 LASSERT(kiblnd_peer_connecting(peer2));
1525 list_add_tail(&tx->tx_list,
1526 &peer2->ibp_tx_queue);
1527 write_unlock_irqrestore(g_lock, flags);
1529 conn = kiblnd_get_conn_locked(peer2);
1530 kiblnd_conn_addref(conn); /* 1 ref for me... */
1532 write_unlock_irqrestore(g_lock, flags);
1535 kiblnd_queue_tx(tx, conn);
1536 kiblnd_conn_decref(conn); /* ...to here */
1539 kiblnd_peer_decref(peer_ni);
1543 /* Brand new peer_ni */
1544 LASSERT(peer_ni->ibp_connecting == 0);
1545 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1546 peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;
1548 /* always called with a ref on ni, which prevents ni being shutdown */
1549 LASSERT(((kib_net_t *)ni->ni_data)->ibn_shutdown == 0);
1552 list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);
1554 kiblnd_peer_addref(peer_ni);
1555 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
1557 write_unlock_irqrestore(g_lock, flags);
1559 for (i = 0; i < tunables->lnd_conns_per_peer; i++)
1560 kiblnd_connect_peer(peer_ni);
1561 kiblnd_peer_decref(peer_ni);
1565 kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
1567 struct lnet_hdr *hdr = &lntmsg->msg_hdr;
1568 int type = lntmsg->msg_type;
1569 struct lnet_process_id target = lntmsg->msg_target;
1570 int target_is_router = lntmsg->msg_target_is_router;
1571 int routing = lntmsg->msg_routing;
1572 unsigned int payload_niov = lntmsg->msg_niov;
1573 struct kvec *payload_iov = lntmsg->msg_iov;
1574 lnet_kiov_t *payload_kiov = lntmsg->msg_kiov;
1575 unsigned int payload_offset = lntmsg->msg_offset;
1576 unsigned int payload_nob = lntmsg->msg_len;
1578 kib_rdma_desc_t *rd;
1583 /* NB 'private' is different depending on what we're sending.... */
1585 CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
1586 payload_nob, payload_niov, libcfs_id2str(target));
1588 LASSERT (payload_nob == 0 || payload_niov > 0);
1589 LASSERT (payload_niov <= LNET_MAX_IOV);
1591 /* Thread context */
1592 LASSERT (!in_interrupt());
1593 /* payload is either all vaddrs or all pages */
1594 LASSERT (!(payload_kiov != NULL && payload_iov != NULL));
1602 LASSERT (payload_nob == 0);
1606 if (routing || target_is_router)
1607 break; /* send IMMEDIATE */
1609 /* is the REPLY message too small for RDMA? */
1610 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
1611 if (nob <= IBLND_MSG_SIZE)
1612 break; /* send IMMEDIATE */
1614 tx = kiblnd_get_idle_tx(ni, target.nid);
1616 CERROR("Can't allocate txd for GET to %s\n",
1617 libcfs_nid2str(target.nid));
1622 rd = &ibmsg->ibm_u.get.ibgm_rd;
1623 if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
1624 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1625 lntmsg->msg_md->md_niov,
1626 lntmsg->msg_md->md_iov.iov,
1627 0, lntmsg->msg_md->md_length);
1629 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1630 lntmsg->msg_md->md_niov,
1631 lntmsg->msg_md->md_iov.kiov,
1632 0, lntmsg->msg_md->md_length);
1634 CERROR("Can't setup GET sink for %s: %d\n",
1635 libcfs_nid2str(target.nid), rc);
1640 nob = offsetof(kib_get_msg_t, ibgm_rd.rd_frags[rd->rd_nfrags]);
1641 ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
1642 ibmsg->ibm_u.get.ibgm_hdr = *hdr;
1644 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);
1646 tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
1647 if (tx->tx_lntmsg[1] == NULL) {
1648 CERROR("Can't create reply for GET -> %s\n",
1649 libcfs_nid2str(target.nid));
1654 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg[0,1] on completion */
1655 tx->tx_waiting = 1; /* waiting for GET_DONE */
1656 kiblnd_launch_tx(ni, tx, target.nid);
1659 case LNET_MSG_REPLY:
1661 /* Is the payload small enough not to need RDMA? */
1662 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob]);
1663 if (nob <= IBLND_MSG_SIZE)
1664 break; /* send IMMEDIATE */
1666 tx = kiblnd_get_idle_tx(ni, target.nid);
1668 CERROR("Can't allocate %s txd for %s\n",
1669 type == LNET_MSG_PUT ? "PUT" : "REPLY",
1670 libcfs_nid2str(target.nid));
1674 if (payload_kiov == NULL)
1675 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1676 payload_niov, payload_iov,
1677 payload_offset, payload_nob);
1679 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1680 payload_niov, payload_kiov,
1681 payload_offset, payload_nob);
1683 CERROR("Can't setup PUT src for %s: %d\n",
1684 libcfs_nid2str(target.nid), rc);
1690 ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
1691 ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
1692 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ, sizeof(kib_putreq_msg_t));
1694 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1695 tx->tx_waiting = 1; /* waiting for PUT_{ACK,NAK} */
1696 kiblnd_launch_tx(ni, tx, target.nid);
1700 /* send IMMEDIATE */
1702 LASSERT (offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[payload_nob])
1705 tx = kiblnd_get_idle_tx(ni, target.nid);
1707 CERROR ("Can't send %d to %s: tx descs exhausted\n",
1708 type, libcfs_nid2str(target.nid));
1713 ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
1715 if (payload_kiov != NULL)
1716 lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
1717 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1718 payload_niov, payload_kiov,
1719 payload_offset, payload_nob);
1721 lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
1722 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1723 payload_niov, payload_iov,
1724 payload_offset, payload_nob);
1726 nob = offsetof(kib_immediate_msg_t, ibim_payload[payload_nob]);
1727 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
1729 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1730 kiblnd_launch_tx(ni, tx, target.nid);
1735 kiblnd_reply(struct lnet_ni *ni, kib_rx_t *rx, struct lnet_msg *lntmsg)
1737 struct lnet_process_id target = lntmsg->msg_target;
1738 unsigned int niov = lntmsg->msg_niov;
1739 struct kvec *iov = lntmsg->msg_iov;
1740 lnet_kiov_t *kiov = lntmsg->msg_kiov;
1741 unsigned int offset = lntmsg->msg_offset;
1742 unsigned int nob = lntmsg->msg_len;
1746 tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
1748 CERROR("Can't get tx for REPLY to %s\n",
1749 libcfs_nid2str(target.nid));
1755 else if (kiov == NULL)
1756 rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
1757 niov, iov, offset, nob);
1759 rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
1760 niov, kiov, offset, nob);
1763 CERROR("Can't setup GET src for %s: %d\n",
1764 libcfs_nid2str(target.nid), rc);
1768 rc = kiblnd_init_rdma(rx->rx_conn, tx,
1769 IBLND_MSG_GET_DONE, nob,
1770 &rx->rx_msg->ibm_u.get.ibgm_rd,
1771 rx->rx_msg->ibm_u.get.ibgm_cookie);
1773 CERROR("Can't setup rdma for GET from %s: %d\n",
1774 libcfs_nid2str(target.nid), rc);
1779 /* No RDMA: local completion may happen now! */
1780 lnet_finalize(lntmsg, 0);
1782 /* RDMA: lnet_finalize(lntmsg) when it
1784 tx->tx_lntmsg[0] = lntmsg;
1787 kiblnd_queue_tx(tx, rx->rx_conn);
1793 lnet_finalize(lntmsg, -EIO);
1797 kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
1798 int delayed, unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
1799 unsigned int offset, unsigned int mlen, unsigned int rlen)
1801 kib_rx_t *rx = private;
1802 kib_msg_t *rxmsg = rx->rx_msg;
1803 kib_conn_t *conn = rx->rx_conn;
1807 int post_credit = IBLND_POSTRX_PEER_CREDIT;
1810 LASSERT (mlen <= rlen);
1811 LASSERT (!in_interrupt());
1812 /* Either all pages or all vaddrs */
1813 LASSERT (!(kiov != NULL && iov != NULL));
1815 switch (rxmsg->ibm_type) {
1819 case IBLND_MSG_IMMEDIATE:
1820 nob = offsetof(kib_msg_t, ibm_u.immediate.ibim_payload[rlen]);
1821 if (nob > rx->rx_nob) {
1822 CERROR ("Immediate message from %s too big: %d(%d)\n",
1823 libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
1830 lnet_copy_flat2kiov(niov, kiov, offset,
1831 IBLND_MSG_SIZE, rxmsg,
1832 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1835 lnet_copy_flat2iov(niov, iov, offset,
1836 IBLND_MSG_SIZE, rxmsg,
1837 offsetof(kib_msg_t, ibm_u.immediate.ibim_payload),
1839 lnet_finalize(lntmsg, 0);
1842 case IBLND_MSG_PUT_REQ: {
1844 kib_rdma_desc_t *rd;
1845 ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;
1848 lnet_finalize(lntmsg, 0);
1849 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1854 tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
1856 CERROR("Can't allocate tx for %s\n",
1857 libcfs_nid2str(conn->ibc_peer->ibp_nid));
1858 /* Not replying will break the connection */
1864 rd = &txmsg->ibm_u.putack.ibpam_rd;
1866 rc = kiblnd_setup_rd_iov(ni, tx, rd,
1867 niov, iov, offset, mlen);
1869 rc = kiblnd_setup_rd_kiov(ni, tx, rd,
1870 niov, kiov, offset, mlen);
1872 CERROR("Can't setup PUT sink for %s: %d\n",
1873 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
1875 /* tell peer_ni it's over */
1876 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
1881 nob = offsetof(kib_putack_msg_t, ibpam_rd.rd_frags[rd->rd_nfrags]);
1882 txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
1883 txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;
1885 kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);
1887 tx->tx_lntmsg[0] = lntmsg; /* finalise lntmsg on completion */
1888 tx->tx_waiting = 1; /* waiting for PUT_DONE */
1889 kiblnd_queue_tx(tx, conn);
1891 /* reposted buffer reserved for PUT_DONE */
1892 post_credit = IBLND_POSTRX_NO_CREDIT;
1896 case IBLND_MSG_GET_REQ:
1897 if (lntmsg != NULL) {
1898 /* Optimized GET; RDMA lntmsg's payload */
1899 kiblnd_reply(ni, rx, lntmsg);
1901 /* GET didn't match anything */
1902 kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
1904 rxmsg->ibm_u.get.ibgm_cookie);
1909 kiblnd_post_rx(rx, post_credit);
1914 kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
1916 struct task_struct *task = kthread_run(fn, arg, name);
1919 return PTR_ERR(task);
1921 atomic_inc(&kiblnd_data.kib_nthreads);
1926 kiblnd_thread_fini (void)
1928 atomic_dec (&kiblnd_data.kib_nthreads);
1932 kiblnd_peer_alive (kib_peer_ni_t *peer_ni)
1934 /* This is racy, but everyone's only writing ktime_get_seconds() */
1935 peer_ni->ibp_last_alive = ktime_get_seconds();
1940 kiblnd_peer_notify (kib_peer_ni_t *peer_ni)
1943 time64_t last_alive = 0;
1944 unsigned long flags;
1946 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1948 if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
1949 error = peer_ni->ibp_error;
1950 peer_ni->ibp_error = 0;
1952 last_alive = peer_ni->ibp_last_alive;
1955 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1958 lnet_notify(peer_ni->ibp_ni,
1959 peer_ni->ibp_nid, 0, last_alive);
1963 kiblnd_close_conn_locked (kib_conn_t *conn, int error)
1965 /* This just does the immediate housekeeping. 'error' is zero for a
1966 * normal shutdown which can happen only after the connection has been
1967 * established. If the connection is established, schedule the
1968 * connection to be finished off by the connd. Otherwise the connd is
1969 * already dealing with it (either to set it up or tear it down).
1970 * Caller holds kib_global_lock exclusively in irq context */
1971 kib_peer_ni_t *peer_ni = conn->ibc_peer;
1973 unsigned long flags;
1975 LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);
1977 if (error != 0 && conn->ibc_comms_error == 0)
1978 conn->ibc_comms_error = error;
1980 if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
1981 return; /* already being handled */
1984 list_empty(&conn->ibc_tx_noops) &&
1985 list_empty(&conn->ibc_tx_queue) &&
1986 list_empty(&conn->ibc_tx_queue_rsrvd) &&
1987 list_empty(&conn->ibc_tx_queue_nocred) &&
1988 list_empty(&conn->ibc_active_txs)) {
1989 CDEBUG(D_NET, "closing conn to %s\n",
1990 libcfs_nid2str(peer_ni->ibp_nid));
1992 CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
1993 libcfs_nid2str(peer_ni->ibp_nid), error,
1994 list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
1995 list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
1996 list_empty(&conn->ibc_tx_queue_rsrvd) ?
1997 "" : "(sending_rsrvd)",
1998 list_empty(&conn->ibc_tx_queue_nocred) ?
1999 "" : "(sending_nocred)",
2000 list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
2003 dev = ((kib_net_t *)peer_ni->ibp_ni->ni_data)->ibn_dev;
2004 if (peer_ni->ibp_next_conn == conn)
2005 /* clear next_conn so it won't be used */
2006 peer_ni->ibp_next_conn = NULL;
2007 list_del(&conn->ibc_list);
2008 /* connd (see below) takes over ibc_list's ref */
2010 if (list_empty(&peer_ni->ibp_conns) && /* no more conns */
2011 kiblnd_peer_active(peer_ni)) { /* still in peer_ni table */
2012 kiblnd_unlink_peer_locked(peer_ni);
2014 /* set/clear error on last conn */
2015 peer_ni->ibp_error = conn->ibc_comms_error;
2018 kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);
2021 kiblnd_dev_can_failover(dev)) {
2022 list_add_tail(&dev->ibd_fail_list,
2023 &kiblnd_data.kib_failed_devs);
2024 wake_up(&kiblnd_data.kib_failover_waitq);
2027 spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);
2029 list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
2030 wake_up(&kiblnd_data.kib_connd_waitq);
2032 spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
2036 kiblnd_close_conn(kib_conn_t *conn, int error)
2038 unsigned long flags;
2040 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2042 kiblnd_close_conn_locked(conn, error);
2044 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2048 kiblnd_abort_txs(kib_conn_t *conn, struct list_head *txs)
2050 struct list_head zombies = LIST_HEAD_INIT(zombies);
2051 struct list_head *tmp;
2052 struct list_head *nxt;
2055 spin_lock(&conn->ibc_lock);
2057 list_for_each_safe(tmp, nxt, txs) {
2058 tx = list_entry(tmp, kib_tx_t, tx_list);
2060 if (txs == &conn->ibc_active_txs) {
2061 LASSERT(!tx->tx_queued);
2062 LASSERT(tx->tx_waiting ||
2063 tx->tx_sending != 0);
2065 LASSERT(tx->tx_queued);
2068 tx->tx_status = -ECONNABORTED;
2071 if (tx->tx_sending == 0) {
2073 list_del(&tx->tx_list);
2074 list_add(&tx->tx_list, &zombies);
2078 spin_unlock(&conn->ibc_lock);
2080 kiblnd_txlist_done(&zombies, -ECONNABORTED);
2084 kiblnd_finalise_conn (kib_conn_t *conn)
2086 LASSERT (!in_interrupt());
2087 LASSERT (conn->ibc_state > IBLND_CONN_INIT);
2089 kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);
2091 /* abort_receives moves QP state to IB_QPS_ERR. This is only required
2092 * for connections that didn't get as far as being connected, because
2093 * rdma_disconnect() does this for free. */
2094 kiblnd_abort_receives(conn);
2096 /* Complete all tx descs not waiting for sends to complete.
2097 * NB we should be safe from RDMA now that the QP has changed state */
2099 kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
2100 kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
2101 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
2102 kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
2103 kiblnd_abort_txs(conn, &conn->ibc_active_txs);
2107 kiblnd_peer_connect_failed(kib_peer_ni_t *peer_ni, int active, int error)
2109 struct list_head zombies = LIST_HEAD_INIT(zombies);
2110 unsigned long flags;
2112 LASSERT (error != 0);
2113 LASSERT (!in_interrupt());
2115 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2118 LASSERT(peer_ni->ibp_connecting > 0);
2119 peer_ni->ibp_connecting--;
2121 LASSERT (peer_ni->ibp_accepting > 0);
2122 peer_ni->ibp_accepting--;
2125 if (kiblnd_peer_connecting(peer_ni)) {
2126 /* another connection attempt under way... */
2127 write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2132 peer_ni->ibp_reconnected = 0;
2133 if (list_empty(&peer_ni->ibp_conns)) {
2134 /* Take peer_ni's blocked transmits to complete with error */
2135 list_add(&zombies, &peer_ni->ibp_tx_queue);
2136 list_del_init(&peer_ni->ibp_tx_queue);
2138 if (kiblnd_peer_active(peer_ni))
2139 kiblnd_unlink_peer_locked(peer_ni);
2141 peer_ni->ibp_error = error;
2143 /* Can't have blocked transmits if there are connections */
2144 LASSERT(list_empty(&peer_ni->ibp_tx_queue));
2147 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2149 kiblnd_peer_notify(peer_ni);
2151 if (list_empty(&zombies))
2154 CNETERR("Deleting messages for %s: connection failed\n",
2155 libcfs_nid2str(peer_ni->ibp_nid));
2157 kiblnd_txlist_done(&zombies, -EHOSTUNREACH);
2161 kiblnd_connreq_done(kib_conn_t *conn, int status)
2163 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2165 struct list_head txs;
2166 unsigned long flags;
2169 active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2171 CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
2172 libcfs_nid2str(peer_ni->ibp_nid), active,
2173 conn->ibc_version, status);
2175 LASSERT (!in_interrupt());
2176 LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
2177 peer_ni->ibp_connecting > 0) ||
2178 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
2179 peer_ni->ibp_accepting > 0));
2181 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
2182 conn->ibc_connvars = NULL;
2185 /* failed to establish connection */
2186 kiblnd_peer_connect_failed(peer_ni, active, status);
2187 kiblnd_finalise_conn(conn);
2191 /* connection established */
2192 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2194 conn->ibc_last_send = ktime_get();
2195 kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
2196 kiblnd_peer_alive(peer_ni);
2198 /* Add conn to peer_ni's list and nuke any dangling conns from a different
2199 * peer_ni instance... */
2200 kiblnd_conn_addref(conn); /* +1 ref for ibc_list */
2201 list_add(&conn->ibc_list, &peer_ni->ibp_conns);
2202 peer_ni->ibp_reconnected = 0;
2204 peer_ni->ibp_connecting--;
2206 peer_ni->ibp_accepting--;
2208 if (peer_ni->ibp_version == 0) {
2209 peer_ni->ibp_version = conn->ibc_version;
2210 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2213 if (peer_ni->ibp_version != conn->ibc_version ||
2214 peer_ni->ibp_incarnation != conn->ibc_incarnation) {
2215 kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
2216 conn->ibc_incarnation);
2217 peer_ni->ibp_version = conn->ibc_version;
2218 peer_ni->ibp_incarnation = conn->ibc_incarnation;
2221 /* grab pending txs while I have the lock */
2222 list_add(&txs, &peer_ni->ibp_tx_queue);
2223 list_del_init(&peer_ni->ibp_tx_queue);
2225 if (!kiblnd_peer_active(peer_ni) || /* peer_ni has been deleted */
2226 conn->ibc_comms_error != 0) { /* error has happened already */
2228 /* start to shut down connection */
2229 kiblnd_close_conn_locked(conn, -ECONNABORTED);
2230 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2232 kiblnd_txlist_done(&txs, -ECONNABORTED);
2237 /* +1 ref for myself, this connection is visible to other threads
2238 * now, refcount of peer:ibp_conns can be released by connection
2239 * close from either a different thread, or the calling of
2240 * kiblnd_check_sends_locked() below. See bz21911 for details.
2242 kiblnd_conn_addref(conn);
2243 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2245 /* Schedule blocked txs
2246 * Note: if we are running with conns_per_peer > 1, these blocked
2247 * txs will all get scheduled to the first connection which gets
2248 * scheduled. We won't be using round robin on this first batch.
2250 spin_lock(&conn->ibc_lock);
2251 while (!list_empty(&txs)) {
2252 tx = list_entry(txs.next, kib_tx_t, tx_list);
2253 list_del(&tx->tx_list);
2255 kiblnd_queue_tx_locked(tx, conn);
2257 kiblnd_check_sends_locked(conn);
2258 spin_unlock(&conn->ibc_lock);
2260 kiblnd_conn_decref(conn);
2264 kiblnd_reject(struct rdma_cm_id *cmid, kib_rej_t *rej)
2268 rc = rdma_reject(cmid, rej, sizeof(*rej));
2271 CWARN("Error %d sending reject\n", rc);
2275 kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
2277 rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2278 kib_msg_t *reqmsg = priv;
2281 kib_peer_ni_t *peer_ni;
2282 kib_peer_ni_t *peer2;
2284 struct lnet_ni *ni = NULL;
2285 kib_net_t *net = NULL;
2287 struct rdma_conn_param cp;
2289 int version = IBLND_MSG_VERSION;
2290 unsigned long flags;
2292 struct sockaddr_in *peer_addr;
2293 LASSERT (!in_interrupt());
2295 /* cmid inherits 'context' from the corresponding listener id */
2296 ibdev = (kib_dev_t *)cmid->context;
2297 LASSERT (ibdev != NULL);
2299 memset(&rej, 0, sizeof(rej));
2300 rej.ibr_magic = IBLND_MSG_MAGIC;
2301 rej.ibr_why = IBLND_REJECT_FATAL;
2302 rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;
2304 peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
2305 if (*kiblnd_tunables.kib_require_priv_port &&
2306 ntohs(peer_addr->sin_port) >= PROT_SOCK) {
2307 __u32 ip = ntohl(peer_addr->sin_addr.s_addr);
2308 CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
2309 &ip, ntohs(peer_addr->sin_port));
2313 if (priv_nob < offsetof(kib_msg_t, ibm_type)) {
2314 CERROR("Short connection request\n");
2318 /* Future protocol version compatibility support! If the
2319 * o2iblnd-specific protocol changes, or when LNET unifies
2320 * protocols over all LNDs, the initial connection will
2321 * negotiate a protocol version. I trap this here to avoid
2322 * console errors; the reject tells the peer_ni which protocol I
2324 if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
2325 reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
2327 if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
2328 reqmsg->ibm_version != IBLND_MSG_VERSION &&
2329 reqmsg->ibm_version != IBLND_MSG_VERSION_1)
2331 if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
2332 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
2333 reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
2336 rc = kiblnd_unpack_msg(reqmsg, priv_nob);
2338 CERROR("Can't parse connection request: %d\n", rc);
2342 nid = reqmsg->ibm_srcnid;
2343 ni = lnet_nid2ni_addref(reqmsg->ibm_dstnid);
2346 net = (kib_net_t *)ni->ni_data;
2347 rej.ibr_incarnation = net->ibn_incarnation;
2350 if (ni == NULL || /* no matching net */
2351 ni->ni_nid != reqmsg->ibm_dstnid || /* right NET, wrong NID! */
2352 net->ibn_dev != ibdev) { /* wrong device */
2353 CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
2354 "bad dst nid %s\n", libcfs_nid2str(nid),
2355 ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
2356 ibdev->ibd_ifname, ibdev->ibd_nnets,
2358 libcfs_nid2str(reqmsg->ibm_dstnid));
2363 /* check time stamp as soon as possible */
2364 if (reqmsg->ibm_dststamp != 0 &&
2365 reqmsg->ibm_dststamp != net->ibn_incarnation) {
2366 CWARN("Stale connection request\n");
2367 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2371 /* I can accept peer_ni's version */
2372 version = reqmsg->ibm_version;
2374 if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
2375 CERROR("Unexpected connreq msg type: %x from %s\n",
2376 reqmsg->ibm_type, libcfs_nid2str(nid));
2380 if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
2381 kiblnd_msg_queue_size(version, ni)) {
2382 CERROR("Can't accept conn from %s, queue depth too large: "
2383 " %d (<=%d wanted)\n",
2384 libcfs_nid2str(nid),
2385 reqmsg->ibm_u.connparams.ibcp_queue_depth,
2386 kiblnd_msg_queue_size(version, ni));
2388 if (version == IBLND_MSG_VERSION)
2389 rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;
2394 if (reqmsg->ibm_u.connparams.ibcp_max_frags >
2395 IBLND_MAX_RDMA_FRAGS) {
2396 CWARN("Can't accept conn from %s (version %x): "
2397 "max_frags %d too large (%d wanted)\n",
2398 libcfs_nid2str(nid), version,
2399 reqmsg->ibm_u.connparams.ibcp_max_frags,
2400 IBLND_MAX_RDMA_FRAGS);
2402 if (version >= IBLND_MSG_VERSION)
2403 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2406 } else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
2407 IBLND_MAX_RDMA_FRAGS &&
2408 net->ibn_fmr_ps == NULL) {
2409 CWARN("Can't accept conn from %s (version %x): "
2410 "max_frags %d incompatible without FMR pool "
2412 libcfs_nid2str(nid), version,
2413 reqmsg->ibm_u.connparams.ibcp_max_frags,
2414 IBLND_MAX_RDMA_FRAGS);
2416 if (version == IBLND_MSG_VERSION)
2417 rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;
2422 if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2423 CERROR("Can't accept %s: message size %d too big (%d max)\n",
2424 libcfs_nid2str(nid),
2425 reqmsg->ibm_u.connparams.ibcp_max_msg_size,
2430 /* assume 'nid' is a new peer_ni; create */
2431 rc = kiblnd_create_peer(ni, &peer_ni, nid);
2433 CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
2434 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2438 /* We have validated the peer's parameters so use those */
2439 peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
2440 peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;
2442 write_lock_irqsave(g_lock, flags);
2444 peer2 = kiblnd_find_peer_locked(ni, nid);
2445 if (peer2 != NULL) {
2446 if (peer2->ibp_version == 0) {
2447 peer2->ibp_version = version;
2448 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2451 /* not the guy I've talked with */
2452 if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
2453 peer2->ibp_version != version) {
2454 kiblnd_close_peer_conns_locked(peer2, -ESTALE);
2456 if (kiblnd_peer_active(peer2)) {
2457 peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
2458 peer2->ibp_version = version;
2460 write_unlock_irqrestore(g_lock, flags);
2462 CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
2463 libcfs_nid2str(nid), peer2->ibp_version, version,
2464 peer2->ibp_incarnation, reqmsg->ibm_srcstamp);
2466 kiblnd_peer_decref(peer_ni);
2467 rej.ibr_why = IBLND_REJECT_CONN_STALE;
2471 /* Tie-break connection race in favour of the higher NID.
2472 * If we keep running into a race condition multiple times,
2473 * we have to assume that the connection attempt with the
2474 * higher NID is stuck in a connecting state and will never
2475 * recover. As such, we pass through this if-block and let
2476 * the lower NID connection win so we can move forward.
2478 if (peer2->ibp_connecting != 0 &&
2479 nid < ni->ni_nid && peer2->ibp_races <
2480 MAX_CONN_RACES_BEFORE_ABORT) {
2482 write_unlock_irqrestore(g_lock, flags);
2484 CDEBUG(D_NET, "Conn race %s\n",
2485 libcfs_nid2str(peer2->ibp_nid));
2487 kiblnd_peer_decref(peer_ni);
2488 rej.ibr_why = IBLND_REJECT_CONN_RACE;
2491 if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
2492 CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
2493 libcfs_nid2str(peer2->ibp_nid),
2494 MAX_CONN_RACES_BEFORE_ABORT);
2496 * passive connection is allowed even this peer_ni is waiting for
2499 peer2->ibp_reconnecting = 0;
2500 peer2->ibp_races = 0;
2501 peer2->ibp_accepting++;
2502 kiblnd_peer_addref(peer2);
2504 /* Race with kiblnd_launch_tx (active connect) to create peer_ni
2505 * so copy validated parameters since we now know what the
2506 * peer_ni's limits are */
2507 peer2->ibp_max_frags = peer_ni->ibp_max_frags;
2508 peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;
2510 write_unlock_irqrestore(g_lock, flags);
2511 kiblnd_peer_decref(peer_ni);
2514 /* Brand new peer_ni */
2515 LASSERT (peer_ni->ibp_accepting == 0);
2516 LASSERT (peer_ni->ibp_version == 0 &&
2517 peer_ni->ibp_incarnation == 0);
2519 peer_ni->ibp_accepting = 1;
2520 peer_ni->ibp_version = version;
2521 peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;
2523 /* I have a ref on ni that prevents it being shutdown */
2524 LASSERT (net->ibn_shutdown == 0);
2526 kiblnd_peer_addref(peer_ni);
2527 list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));
2529 write_unlock_irqrestore(g_lock, flags);
2532 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
2534 kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
2535 kiblnd_peer_decref(peer_ni);
2536 rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
2540 /* conn now "owns" cmid, so I return success from here on to ensure the
2541 * CM callback doesn't destroy cmid. */
2542 conn->ibc_incarnation = reqmsg->ibm_srcstamp;
2543 conn->ibc_credits = conn->ibc_queue_depth;
2544 conn->ibc_reserved_credits = conn->ibc_queue_depth;
2545 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2546 IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));
2548 ackmsg = &conn->ibc_connvars->cv_msg;
2549 memset(ackmsg, 0, sizeof(*ackmsg));
2551 kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
2552 sizeof(ackmsg->ibm_u.connparams));
2553 ackmsg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2554 ackmsg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2555 ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2557 kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);
2559 memset(&cp, 0, sizeof(cp));
2560 cp.private_data = ackmsg;
2561 cp.private_data_len = ackmsg->ibm_nob;
2562 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2563 cp.initiator_depth = 0;
2564 cp.flow_control = 1;
2565 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2566 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2568 CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));
2570 rc = rdma_accept(cmid, &cp);
2572 CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
2573 rej.ibr_version = version;
2574 rej.ibr_why = IBLND_REJECT_FATAL;
2576 kiblnd_reject(cmid, &rej);
2577 kiblnd_connreq_done(conn, rc);
2578 kiblnd_conn_decref(conn);
2586 rej.ibr_cp.ibcp_queue_depth =
2587 kiblnd_msg_queue_size(version, ni);
2588 rej.ibr_cp.ibcp_max_frags = IBLND_MAX_RDMA_FRAGS;
2592 rej.ibr_version = version;
2593 kiblnd_reject(cmid, &rej);
2595 return -ECONNREFUSED;
2599 kiblnd_check_reconnect(kib_conn_t *conn, int version,
2600 __u64 incarnation, int why, kib_connparams_t *cp)
2602 rwlock_t *glock = &kiblnd_data.kib_global_lock;
2603 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2605 int msg_size = IBLND_MSG_SIZE;
2609 unsigned long flags;
2611 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2612 LASSERT(peer_ni->ibp_connecting > 0); /* 'conn' at least */
2615 msg_size = cp->ibcp_max_msg_size;
2616 frag_num = cp->ibcp_max_frags;
2617 queue_dep = cp->ibcp_queue_depth;
2620 write_lock_irqsave(glock, flags);
2621 /* retry connection if it's still needed and no other connection
2622 * attempts (active or passive) are in progress
2623 * NB: reconnect is still needed even when ibp_tx_queue is
2624 * empty if ibp_version != version because reconnect may be
2625 * initiated by kiblnd_query() */
2626 reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
2627 peer_ni->ibp_version != version) &&
2628 peer_ni->ibp_connecting &&
2629 peer_ni->ibp_accepting == 0;
2640 case IBLND_REJECT_RDMA_FRAGS: {
2641 struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2644 reason = "can't negotiate max frags";
2647 tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2648 #ifdef HAVE_IB_GET_DMA_MR
2650 * This check only makes sense if the kernel supports global
2651 * memory registration. Otherwise, map_on_demand will never == 0
2653 if (!tunables->lnd_map_on_demand) {
2654 reason = "map_on_demand must be enabled";
2658 if (conn->ibc_max_frags <= frag_num) {
2659 reason = "unsupported max frags";
2663 peer_ni->ibp_max_frags = frag_num;
2664 reason = "rdma fragments";
2667 case IBLND_REJECT_MSG_QUEUE_SIZE:
2669 reason = "can't negotiate queue depth";
2672 if (conn->ibc_queue_depth <= queue_dep) {
2673 reason = "unsupported queue depth";
2677 peer_ni->ibp_queue_depth = queue_dep;
2678 reason = "queue depth";
2681 case IBLND_REJECT_CONN_STALE:
2685 case IBLND_REJECT_CONN_RACE:
2686 reason = "conn race";
2689 case IBLND_REJECT_CONN_UNCOMPAT:
2690 reason = "version negotiation";
2693 case IBLND_REJECT_INVALID_SRV_ID:
2694 reason = "invalid service id";
2698 conn->ibc_reconnect = 1;
2699 peer_ni->ibp_reconnecting++;
2700 peer_ni->ibp_version = version;
2701 if (incarnation != 0)
2702 peer_ni->ibp_incarnation = incarnation;
2704 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2706 CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
2707 libcfs_nid2str(peer_ni->ibp_nid),
2708 reconnect ? "reconnect" : "don't reconnect",
2709 reason, IBLND_MSG_VERSION, version, msg_size,
2710 conn->ibc_queue_depth, queue_dep,
2711 conn->ibc_max_frags, frag_num);
2713 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
2714 * while destroying the zombie
2719 kiblnd_rejected (kib_conn_t *conn, int reason, void *priv, int priv_nob)
2721 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2723 LASSERT (!in_interrupt());
2724 LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
2727 case IB_CM_REJ_STALE_CONN:
2728 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2729 IBLND_REJECT_CONN_STALE, NULL);
2732 case IB_CM_REJ_INVALID_SERVICE_ID:
2733 kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
2734 IBLND_REJECT_INVALID_SRV_ID, NULL);
2735 CNETERR("%s rejected: no listener at %d\n",
2736 libcfs_nid2str(peer_ni->ibp_nid),
2737 *kiblnd_tunables.kib_service);
2740 case IB_CM_REJ_CONSUMER_DEFINED:
2741 if (priv_nob >= offsetof(kib_rej_t, ibr_padding)) {
2742 kib_rej_t *rej = priv;
2743 kib_connparams_t *cp = NULL;
2745 __u64 incarnation = -1;
2747 /* NB. default incarnation is -1 because:
2748 * a) V1 will ignore dst incarnation in connreq.
2749 * b) V2 will provide incarnation while rejecting me,
2750 * -1 will be overwrote.
2752 * if I try to connect to a V1 peer_ni with V2 protocol,
2753 * it rejected me then upgrade to V2, I have no idea
2754 * about the upgrading and try to reconnect with V1,
2755 * in this case upgraded V2 can find out I'm trying to
2756 * talk to the old guy and reject me(incarnation is -1).
2759 if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
2760 rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
2761 __swab32s(&rej->ibr_magic);
2762 __swab16s(&rej->ibr_version);
2766 if (priv_nob >= sizeof(kib_rej_t) &&
2767 rej->ibr_version > IBLND_MSG_VERSION_1) {
2768 /* priv_nob is always 148 in current version
2769 * of OFED, so we still need to check version.
2770 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
2774 __swab64s(&rej->ibr_incarnation);
2775 __swab16s(&cp->ibcp_queue_depth);
2776 __swab16s(&cp->ibcp_max_frags);
2777 __swab32s(&cp->ibcp_max_msg_size);
2780 incarnation = rej->ibr_incarnation;
2783 if (rej->ibr_magic != IBLND_MSG_MAGIC &&
2784 rej->ibr_magic != LNET_PROTO_MAGIC) {
2785 CERROR("%s rejected: consumer defined fatal error\n",
2786 libcfs_nid2str(peer_ni->ibp_nid));
2790 if (rej->ibr_version != IBLND_MSG_VERSION &&
2791 rej->ibr_version != IBLND_MSG_VERSION_1) {
2792 CERROR("%s rejected: o2iblnd version %x error\n",
2793 libcfs_nid2str(peer_ni->ibp_nid),
2798 if (rej->ibr_why == IBLND_REJECT_FATAL &&
2799 rej->ibr_version == IBLND_MSG_VERSION_1) {
2800 CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
2801 libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);
2803 if (conn->ibc_version != IBLND_MSG_VERSION_1)
2804 rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
2807 switch (rej->ibr_why) {
2808 case IBLND_REJECT_CONN_RACE:
2809 case IBLND_REJECT_CONN_STALE:
2810 case IBLND_REJECT_CONN_UNCOMPAT:
2811 case IBLND_REJECT_MSG_QUEUE_SIZE:
2812 case IBLND_REJECT_RDMA_FRAGS:
2813 kiblnd_check_reconnect(conn, rej->ibr_version,
2814 incarnation, rej->ibr_why, cp);
2817 case IBLND_REJECT_NO_RESOURCES:
2818 CERROR("%s rejected: o2iblnd no resources\n",
2819 libcfs_nid2str(peer_ni->ibp_nid));
2822 case IBLND_REJECT_FATAL:
2823 CERROR("%s rejected: o2iblnd fatal error\n",
2824 libcfs_nid2str(peer_ni->ibp_nid));
2828 CERROR("%s rejected: o2iblnd reason %d\n",
2829 libcfs_nid2str(peer_ni->ibp_nid),
2837 CNETERR("%s rejected: reason %d, size %d\n",
2838 libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
2842 kiblnd_connreq_done(conn, -ECONNREFUSED);
2846 kiblnd_check_connreply (kib_conn_t *conn, void *priv, int priv_nob)
2848 kib_peer_ni_t *peer_ni = conn->ibc_peer;
2849 struct lnet_ni *ni = peer_ni->ibp_ni;
2850 kib_net_t *net = ni->ni_data;
2851 kib_msg_t *msg = priv;
2852 int ver = conn->ibc_version;
2853 int rc = kiblnd_unpack_msg(msg, priv_nob);
2854 unsigned long flags;
2856 LASSERT (net != NULL);
2859 CERROR("Can't unpack connack from %s: %d\n",
2860 libcfs_nid2str(peer_ni->ibp_nid), rc);
2864 if (msg->ibm_type != IBLND_MSG_CONNACK) {
2865 CERROR("Unexpected message %d from %s\n",
2866 msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
2871 if (ver != msg->ibm_version) {
2872 CERROR("%s replied version %x is different with "
2873 "requested version %x\n",
2874 libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
2879 if (msg->ibm_u.connparams.ibcp_queue_depth >
2880 conn->ibc_queue_depth) {
2881 CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
2882 libcfs_nid2str(peer_ni->ibp_nid),
2883 msg->ibm_u.connparams.ibcp_queue_depth,
2884 conn->ibc_queue_depth);
2889 if (msg->ibm_u.connparams.ibcp_max_frags >
2890 conn->ibc_max_frags) {
2891 CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
2892 libcfs_nid2str(peer_ni->ibp_nid),
2893 msg->ibm_u.connparams.ibcp_max_frags,
2894 conn->ibc_max_frags);
2899 if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
2900 CERROR("%s max message size %d too big (%d max)\n",
2901 libcfs_nid2str(peer_ni->ibp_nid),
2902 msg->ibm_u.connparams.ibcp_max_msg_size,
2908 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2909 if (msg->ibm_dstnid == ni->ni_nid &&
2910 msg->ibm_dststamp == net->ibn_incarnation)
2914 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2917 CERROR("Bad connection reply from %s, rc = %d, "
2918 "version: %x max_frags: %d\n",
2919 libcfs_nid2str(peer_ni->ibp_nid), rc,
2920 msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
2924 conn->ibc_incarnation = msg->ibm_srcstamp;
2925 conn->ibc_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2926 conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
2927 conn->ibc_queue_depth = msg->ibm_u.connparams.ibcp_queue_depth;
2928 conn->ibc_max_frags = msg->ibm_u.connparams.ibcp_max_frags;
2929 LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
2930 IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));
2932 kiblnd_connreq_done(conn, 0);
2936 /* NB My QP has already established itself, so I handle anything going
2937 * wrong here by setting ibc_comms_error.
2938 * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
2939 * immediately tears it down. */
2942 conn->ibc_comms_error = rc;
2943 kiblnd_connreq_done(conn, 0);
2947 kiblnd_active_connect (struct rdma_cm_id *cmid)
2949 kib_peer_ni_t *peer_ni = (kib_peer_ni_t *)cmid->context;
2952 struct rdma_conn_param cp;
2955 unsigned long flags;
2958 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2960 incarnation = peer_ni->ibp_incarnation;
2961 version = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
2962 peer_ni->ibp_version;
2964 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2966 conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
2969 kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
2970 kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
2974 /* conn "owns" cmid now, so I return success from here on to ensure the
2975 * CM callback doesn't destroy cmid. conn also takes over cmid's ref
2978 msg = &conn->ibc_connvars->cv_msg;
2980 memset(msg, 0, sizeof(*msg));
2981 kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
2982 msg->ibm_u.connparams.ibcp_queue_depth = conn->ibc_queue_depth;
2983 msg->ibm_u.connparams.ibcp_max_frags = conn->ibc_max_frags;
2984 msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;
2986 kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
2987 0, peer_ni->ibp_nid, incarnation);
2989 memset(&cp, 0, sizeof(cp));
2990 cp.private_data = msg;
2991 cp.private_data_len = msg->ibm_nob;
2992 cp.responder_resources = 0; /* No atomic ops or RDMA reads */
2993 cp.initiator_depth = 0;
2994 cp.flow_control = 1;
2995 cp.retry_count = *kiblnd_tunables.kib_retry_count;
2996 cp.rnr_retry_count = *kiblnd_tunables.kib_rnr_retry_count;
2998 LASSERT(cmid->context == (void *)conn);
2999 LASSERT(conn->ibc_cmid == cmid);
3001 rc = rdma_connect(cmid, &cp);
3003 CERROR("Can't connect to %s: %d\n",
3004 libcfs_nid2str(peer_ni->ibp_nid), rc);
3005 kiblnd_connreq_done(conn, rc);
3006 kiblnd_conn_decref(conn);
3013 kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
3015 kib_peer_ni_t *peer_ni;
3019 switch (event->event) {
3021 CERROR("Unexpected event: %d, status: %d\n",
3022 event->event, event->status);
3025 case RDMA_CM_EVENT_CONNECT_REQUEST:
3026 /* destroy cmid on failure */
3027 rc = kiblnd_passive_connect(cmid,
3028 (void *)KIBLND_CONN_PARAM(event),
3029 KIBLND_CONN_PARAM_LEN(event));
3030 CDEBUG(D_NET, "connreq: %d\n", rc);
3033 case RDMA_CM_EVENT_ADDR_ERROR:
3034 peer_ni = (kib_peer_ni_t *)cmid->context;
3035 CNETERR("%s: ADDR ERROR %d\n",
3036 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3037 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3038 kiblnd_peer_decref(peer_ni);
3039 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3041 case RDMA_CM_EVENT_ADDR_RESOLVED:
3042 peer_ni = (kib_peer_ni_t *)cmid->context;
3044 CDEBUG(D_NET,"%s Addr resolved: %d\n",
3045 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3047 if (event->status != 0) {
3048 CNETERR("Can't resolve address for %s: %d\n",
3049 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3052 rc = rdma_resolve_route(
3053 cmid, *kiblnd_tunables.kib_timeout * 1000);
3055 kib_net_t *net = peer_ni->ibp_ni->ni_data;
3056 kib_dev_t *dev = net->ibn_dev;
3058 CDEBUG(D_NET, "%s: connection bound to "\
3060 libcfs_nid2str(peer_ni->ibp_nid),
3062 &dev->ibd_ifip, cmid->device->name);
3067 /* Can't initiate route resolution */
3068 CERROR("Can't resolve route for %s: %d\n",
3069 libcfs_nid2str(peer_ni->ibp_nid), rc);
3071 kiblnd_peer_connect_failed(peer_ni, 1, rc);
3072 kiblnd_peer_decref(peer_ni);
3073 return rc; /* rc != 0 destroys cmid */
3075 case RDMA_CM_EVENT_ROUTE_ERROR:
3076 peer_ni = (kib_peer_ni_t *)cmid->context;
3077 CNETERR("%s: ROUTE ERROR %d\n",
3078 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3079 kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
3080 kiblnd_peer_decref(peer_ni);
3081 return -EHOSTUNREACH; /* rc != 0 destroys cmid */
3083 case RDMA_CM_EVENT_ROUTE_RESOLVED:
3084 peer_ni = (kib_peer_ni_t *)cmid->context;
3085 CDEBUG(D_NET,"%s Route resolved: %d\n",
3086 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3088 if (event->status == 0)
3089 return kiblnd_active_connect(cmid);
3091 CNETERR("Can't resolve route for %s: %d\n",
3092 libcfs_nid2str(peer_ni->ibp_nid), event->status);
3093 kiblnd_peer_connect_failed(peer_ni, 1, event->status);
3094 kiblnd_peer_decref(peer_ni);
3095 return event->status; /* rc != 0 destroys cmid */
3097 case RDMA_CM_EVENT_UNREACHABLE:
3098 conn = (kib_conn_t *)cmid->context;
3099 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3100 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3101 CNETERR("%s: UNREACHABLE %d\n",
3102 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3103 kiblnd_connreq_done(conn, -ENETDOWN);
3104 kiblnd_conn_decref(conn);
3107 case RDMA_CM_EVENT_CONNECT_ERROR:
3108 conn = (kib_conn_t *)cmid->context;
3109 LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
3110 conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
3111 CNETERR("%s: CONNECT ERROR %d\n",
3112 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
3113 kiblnd_connreq_done(conn, -ENOTCONN);
3114 kiblnd_conn_decref(conn);
3117 case RDMA_CM_EVENT_REJECTED:
3118 conn = (kib_conn_t *)cmid->context;
3119 switch (conn->ibc_state) {
3123 case IBLND_CONN_PASSIVE_WAIT:
3124 CERROR ("%s: REJECTED %d\n",
3125 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3127 kiblnd_connreq_done(conn, -ECONNRESET);
3130 case IBLND_CONN_ACTIVE_CONNECT:
3131 kiblnd_rejected(conn, event->status,
3132 (void *)KIBLND_CONN_PARAM(event),
3133 KIBLND_CONN_PARAM_LEN(event));
3136 kiblnd_conn_decref(conn);
3139 case RDMA_CM_EVENT_ESTABLISHED:
3140 conn = (kib_conn_t *)cmid->context;
3141 switch (conn->ibc_state) {
3145 case IBLND_CONN_PASSIVE_WAIT:
3146 CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
3147 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3148 kiblnd_connreq_done(conn, 0);
3151 case IBLND_CONN_ACTIVE_CONNECT:
3152 CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
3153 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3154 kiblnd_check_connreply(conn,
3155 (void *)KIBLND_CONN_PARAM(event),
3156 KIBLND_CONN_PARAM_LEN(event));
3159 /* net keeps its ref on conn! */
3162 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
3163 CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
3166 case RDMA_CM_EVENT_DISCONNECTED:
3167 conn = (kib_conn_t *)cmid->context;
3168 if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
3169 CERROR("%s DISCONNECTED\n",
3170 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3171 kiblnd_connreq_done(conn, -ECONNRESET);
3173 kiblnd_close_conn(conn, 0);
3175 kiblnd_conn_decref(conn);
3176 cmid->context = NULL;
3179 case RDMA_CM_EVENT_DEVICE_REMOVAL:
3180 LCONSOLE_ERROR_MSG(0x131,
3181 "Received notification of device removal\n"
3182 "Please shutdown LNET to allow this to proceed\n");
3183 /* Can't remove network from underneath LNET for now, so I have
3187 case RDMA_CM_EVENT_ADDR_CHANGE:
3188 LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
3194 kiblnd_check_txs_locked(kib_conn_t *conn, struct list_head *txs)
3197 struct list_head *ttmp;
3199 list_for_each(ttmp, txs) {
3200 tx = list_entry(ttmp, kib_tx_t, tx_list);
3202 if (txs != &conn->ibc_active_txs) {
3203 LASSERT(tx->tx_queued);
3205 LASSERT(!tx->tx_queued);
3206 LASSERT(tx->tx_waiting || tx->tx_sending != 0);
3209 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3210 CERROR("Timed out tx: %s, %lld seconds\n",
3211 kiblnd_queue2str(conn, txs),
3212 ktime_ms_delta(ktime_get(),
3213 tx->tx_deadline) / MSEC_PER_SEC);
3222 kiblnd_conn_timed_out_locked(kib_conn_t *conn)
3224 return kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
3225 kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
3226 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
3227 kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
3228 kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
3232 kiblnd_check_conns (int idx)
3234 struct list_head closes = LIST_HEAD_INIT(closes);
3235 struct list_head checksends = LIST_HEAD_INIT(checksends);
3236 struct list_head timedout_txs = LIST_HEAD_INIT(timedout_txs);
3237 struct list_head *peers = &kiblnd_data.kib_peers[idx];
3238 struct list_head *ptmp;
3239 kib_peer_ni_t *peer_ni;
3241 kib_tx_t *tx, *tx_tmp;
3242 struct list_head *ctmp;
3243 unsigned long flags;
3245 /* NB. We expect to have a look at all the peers and not find any
3246 * RDMAs to time out, so we just use a shared lock while we
3248 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3250 list_for_each(ptmp, peers) {
3251 peer_ni = list_entry(ptmp, kib_peer_ni_t, ibp_list);
3253 /* Check tx_deadline */
3254 list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
3255 if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
3256 CWARN("Timed out tx for %s: %lld seconds\n",
3257 libcfs_nid2str(peer_ni->ibp_nid),
3258 ktime_ms_delta(ktime_get(),
3259 tx->tx_deadline) / MSEC_PER_SEC);
3260 list_move(&tx->tx_list, &timedout_txs);
3264 list_for_each(ctmp, &peer_ni->ibp_conns) {
3268 conn = list_entry(ctmp, kib_conn_t, ibc_list);
3270 LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);
3272 spin_lock(&conn->ibc_lock);
3274 sendnoop = kiblnd_need_noop(conn);
3275 timedout = kiblnd_conn_timed_out_locked(conn);
3276 if (!sendnoop && !timedout) {
3277 spin_unlock(&conn->ibc_lock);
3282 CERROR("Timed out RDMA with %s (%lld): "
3283 "c: %u, oc: %u, rc: %u\n",
3284 libcfs_nid2str(peer_ni->ibp_nid),
3285 ktime_get_seconds() - peer_ni->ibp_last_alive,
3287 conn->ibc_outstanding_credits,
3288 conn->ibc_reserved_credits);
3289 list_add(&conn->ibc_connd_list, &closes);
3291 list_add(&conn->ibc_connd_list, &checksends);
3293 /* +ref for 'closes' or 'checksends' */
3294 kiblnd_conn_addref(conn);
3296 spin_unlock(&conn->ibc_lock);
3300 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3302 if (!list_empty(&timedout_txs))
3303 kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT);
3305 /* Handle timeout by closing the whole
3306 * connection. We can only be sure RDMA activity
3307 * has ceased once the QP has been modified. */
3308 while (!list_empty(&closes)) {
3309 conn = list_entry(closes.next,
3310 kib_conn_t, ibc_connd_list);
3311 list_del(&conn->ibc_connd_list);
3312 kiblnd_close_conn(conn, -ETIMEDOUT);
3313 kiblnd_conn_decref(conn);
3316 /* In case we have enough credits to return via a
3317 * NOOP, but there were no non-blocking tx descs
3318 * free to do it last time... */
3319 while (!list_empty(&checksends)) {
3320 conn = list_entry(checksends.next,
3321 kib_conn_t, ibc_connd_list);
3322 list_del(&conn->ibc_connd_list);
3324 spin_lock(&conn->ibc_lock);
3325 kiblnd_check_sends_locked(conn);
3326 spin_unlock(&conn->ibc_lock);
3328 kiblnd_conn_decref(conn);
3333 kiblnd_disconnect_conn (kib_conn_t *conn)
3335 LASSERT (!in_interrupt());
3336 LASSERT (current == kiblnd_data.kib_connd);
3337 LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);
3339 rdma_disconnect(conn->ibc_cmid);
3340 kiblnd_finalise_conn(conn);
3342 kiblnd_peer_notify(conn->ibc_peer);
3346 * High-water for reconnection to the same peer_ni, reconnection attempt should
3347 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
3349 #define KIB_RECONN_HIGH_RACE 10
3351 * Allow connd to take a break and handle other things after consecutive
3352 * reconnection attemps.
3354 #define KIB_RECONN_BREAK 100
3357 kiblnd_connd (void *arg)
3359 spinlock_t *lock= &kiblnd_data.kib_connd_lock;
3360 wait_queue_entry_t wait;
3361 unsigned long flags;
3367 unsigned long deadline = jiffies;
3369 cfs_block_allsigs();
3371 init_waitqueue_entry(&wait, current);
3372 kiblnd_data.kib_connd = current;
3374 spin_lock_irqsave(lock, flags);
3376 while (!kiblnd_data.kib_shutdown) {
3381 if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
3382 kib_peer_ni_t *peer_ni = NULL;
3384 conn = list_entry(kiblnd_data.kib_connd_zombies.next,
3385 kib_conn_t, ibc_list);
3386 list_del(&conn->ibc_list);
3387 if (conn->ibc_reconnect) {
3388 peer_ni = conn->ibc_peer;
3389 kiblnd_peer_addref(peer_ni);
3392 spin_unlock_irqrestore(lock, flags);
3395 kiblnd_destroy_conn(conn);
3397 spin_lock_irqsave(lock, flags);
3399 LIBCFS_FREE(conn, sizeof(*conn));
3403 conn->ibc_peer = peer_ni;
3404 if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
3405 list_add_tail(&conn->ibc_list,
3406 &kiblnd_data.kib_reconn_list);
3408 list_add_tail(&conn->ibc_list,
3409 &kiblnd_data.kib_reconn_wait);
3412 if (!list_empty(&kiblnd_data.kib_connd_conns)) {
3413 conn = list_entry(kiblnd_data.kib_connd_conns.next,
3414 kib_conn_t, ibc_list);
3415 list_del(&conn->ibc_list);
3417 spin_unlock_irqrestore(lock, flags);
3420 kiblnd_disconnect_conn(conn);
3421 kiblnd_conn_decref(conn);
3423 spin_lock_irqsave(lock, flags);
3426 while (reconn < KIB_RECONN_BREAK) {
3427 if (kiblnd_data.kib_reconn_sec !=
3428 ktime_get_real_seconds()) {
3429 kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
3430 list_splice_init(&kiblnd_data.kib_reconn_wait,
3431 &kiblnd_data.kib_reconn_list);
3434 if (list_empty(&kiblnd_data.kib_reconn_list))
3437 conn = list_entry(kiblnd_data.kib_reconn_list.next,
3438 kib_conn_t, ibc_list);
3439 list_del(&conn->ibc_list);
3441 spin_unlock_irqrestore(lock, flags);
3444 reconn += kiblnd_reconnect_peer(conn->ibc_peer);
3445 kiblnd_peer_decref(conn->ibc_peer);
3446 LIBCFS_FREE(conn, sizeof(*conn));
3448 spin_lock_irqsave(lock, flags);
3451 /* careful with the jiffy wrap... */
3452 timeout = (int)(deadline - jiffies);
3456 int chunk = kiblnd_data.kib_peer_hash_size;
3458 spin_unlock_irqrestore(lock, flags);
3461 /* Time to check for RDMA timeouts on a few more
3462 * peers: I do checks every 'p' seconds on a
3463 * proportion of the peer_ni table and I need to check
3464 * every connection 'n' times within a timeout
3465 * interval, to ensure I detect a timeout on any
3466 * connection within (n+1)/n times the timeout
3469 if (*kiblnd_tunables.kib_timeout > n * p)
3470 chunk = (chunk * n * p) /
3471 *kiblnd_tunables.kib_timeout;
3475 for (i = 0; i < chunk; i++) {
3476 kiblnd_check_conns(peer_index);
3477 peer_index = (peer_index + 1) %
3478 kiblnd_data.kib_peer_hash_size;
3481 deadline += msecs_to_jiffies(p * MSEC_PER_SEC);
3482 spin_lock_irqsave(lock, flags);
3488 /* Nothing to do for 'timeout' */
3489 set_current_state(TASK_INTERRUPTIBLE);
3490 add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3491 spin_unlock_irqrestore(lock, flags);
3493 schedule_timeout(timeout);
3495 set_current_state(TASK_RUNNING);
3496 remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
3497 spin_lock_irqsave(lock, flags);
3500 spin_unlock_irqrestore(lock, flags);
3502 kiblnd_thread_fini();
3507 kiblnd_qp_event(struct ib_event *event, void *arg)
3509 kib_conn_t *conn = arg;
3511 switch (event->event) {
3512 case IB_EVENT_COMM_EST:
3513 CDEBUG(D_NET, "%s established\n",
3514 libcfs_nid2str(conn->ibc_peer->ibp_nid));
3515 /* We received a packet but connection isn't established
3516 * probably handshake packet was lost, so free to
3517 * force make connection established */
3518 rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
3522 CERROR("%s: Async QP event type %d\n",
3523 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3529 kiblnd_complete (struct ib_wc *wc)
3531 switch (kiblnd_wreqid2type(wc->wr_id)) {
3536 if (wc->status != IB_WC_SUCCESS &&
3537 wc->status != IB_WC_WR_FLUSH_ERR)
3538 CNETERR("FastReg failed: %d\n", wc->status);
3541 case IBLND_WID_RDMA:
3542 /* We only get RDMA completion notification if it fails. All
3543 * subsequent work items, including the final SEND will fail
3544 * too. However we can't print out any more info about the
3545 * failing RDMA because 'tx' might be back on the idle list or
3546 * even reused already if we didn't manage to post all our work
3548 CNETERR("RDMA (tx: %p) failed: %d\n",
3549 kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3553 kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
3557 kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
3564 kiblnd_cq_completion(struct ib_cq *cq, void *arg)
3566 /* NB I'm not allowed to schedule this conn once its refcount has
3567 * reached 0. Since fundamentally I'm racing with scheduler threads
3568 * consuming my CQ I could be called after all completions have
3569 * occurred. But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
3570 * and this CQ is about to be destroyed so I NOOP. */
3571 kib_conn_t *conn = (kib_conn_t *)arg;
3572 struct kib_sched_info *sched = conn->ibc_sched;
3573 unsigned long flags;
3575 LASSERT(cq == conn->ibc_cq);
3577 spin_lock_irqsave(&sched->ibs_lock, flags);
3579 conn->ibc_ready = 1;
3581 if (!conn->ibc_scheduled &&
3582 (conn->ibc_nrx > 0 ||
3583 conn->ibc_nsends_posted > 0)) {
3584 kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
3585 conn->ibc_scheduled = 1;
3586 list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);
3588 if (waitqueue_active(&sched->ibs_waitq))
3589 wake_up(&sched->ibs_waitq);
3592 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3596 kiblnd_cq_event(struct ib_event *event, void *arg)
3598 kib_conn_t *conn = arg;
3600 CERROR("%s: async CQ event type %d\n",
3601 libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
3605 kiblnd_scheduler(void *arg)
3607 long id = (long)arg;
3608 struct kib_sched_info *sched;
3610 wait_queue_entry_t wait;
3611 unsigned long flags;
3617 cfs_block_allsigs();
3619 init_waitqueue_entry(&wait, current);
3621 sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];
3623 rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
3625 CWARN("Unable to bind on CPU partition %d, please verify "
3626 "whether all CPUs are healthy and reload modules if "
3627 "necessary, otherwise your system might under risk of "
3628 "low performance\n", sched->ibs_cpt);
3631 spin_lock_irqsave(&sched->ibs_lock, flags);
3633 while (!kiblnd_data.kib_shutdown) {
3634 if (busy_loops++ >= IBLND_RESCHED) {
3635 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3640 spin_lock_irqsave(&sched->ibs_lock, flags);
3645 if (!list_empty(&sched->ibs_conns)) {
3646 conn = list_entry(sched->ibs_conns.next,
3647 kib_conn_t, ibc_sched_list);
3648 /* take over kib_sched_conns' ref on conn... */
3649 LASSERT(conn->ibc_scheduled);
3650 list_del(&conn->ibc_sched_list);
3651 conn->ibc_ready = 0;
3653 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3655 wc.wr_id = IBLND_WID_INVAL;
3657 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3659 rc = ib_req_notify_cq(conn->ibc_cq,
3662 CWARN("%s: ib_req_notify_cq failed: %d, "
3663 "closing connection\n",
3664 libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
3665 kiblnd_close_conn(conn, -EIO);
3666 kiblnd_conn_decref(conn);
3667 spin_lock_irqsave(&sched->ibs_lock,
3672 rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
3675 if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
3677 "ib_poll_cq (rc: %d) returned invalid "
3678 "wr_id, opcode %d, status: %d, "
3679 "vendor_err: %d, conn: %s status: %d\n"
3680 "please upgrade firmware and OFED or "
3681 "contact vendor.\n", rc,
3682 wc.opcode, wc.status, wc.vendor_err,
3683 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3689 CWARN("%s: ib_poll_cq failed: %d, "
3690 "closing connection\n",
3691 libcfs_nid2str(conn->ibc_peer->ibp_nid),
3693 kiblnd_close_conn(conn, -EIO);
3694 kiblnd_conn_decref(conn);
3695 spin_lock_irqsave(&sched->ibs_lock, flags);
3699 spin_lock_irqsave(&sched->ibs_lock, flags);
3701 if (rc != 0 || conn->ibc_ready) {
3702 /* There may be another completion waiting; get
3703 * another scheduler to check while I handle
3705 /* +1 ref for sched_conns */
3706 kiblnd_conn_addref(conn);
3707 list_add_tail(&conn->ibc_sched_list,
3709 if (waitqueue_active(&sched->ibs_waitq))
3710 wake_up(&sched->ibs_waitq);
3712 conn->ibc_scheduled = 0;
3716 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3717 kiblnd_complete(&wc);
3719 spin_lock_irqsave(&sched->ibs_lock, flags);
3722 kiblnd_conn_decref(conn); /* ...drop my ref from above */
3729 set_current_state(TASK_INTERRUPTIBLE);
3730 add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
3731 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3736 remove_wait_queue(&sched->ibs_waitq, &wait);
3737 set_current_state(TASK_RUNNING);
3738 spin_lock_irqsave(&sched->ibs_lock, flags);
3741 spin_unlock_irqrestore(&sched->ibs_lock, flags);
3743 kiblnd_thread_fini();
3748 kiblnd_failover_thread(void *arg)
3750 rwlock_t *glock = &kiblnd_data.kib_global_lock;
3752 wait_queue_entry_t wait;
3753 unsigned long flags;
3756 LASSERT(*kiblnd_tunables.kib_dev_failover != 0);
3758 cfs_block_allsigs();
3760 init_waitqueue_entry(&wait, current);
3761 write_lock_irqsave(glock, flags);
3763 while (!kiblnd_data.kib_shutdown) {
3764 int do_failover = 0;
3767 list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
3769 if (ktime_get_seconds() < dev->ibd_next_failover)
3776 list_del_init(&dev->ibd_fail_list);
3777 dev->ibd_failover = 1;
3778 write_unlock_irqrestore(glock, flags);
3780 rc = kiblnd_dev_failover(dev);
3782 write_lock_irqsave(glock, flags);
3784 LASSERT (dev->ibd_failover);
3785 dev->ibd_failover = 0;
3786 if (rc >= 0) { /* Device is OK or failover succeed */
3787 dev->ibd_next_failover = ktime_get_seconds() + 3;
3791 /* failed to failover, retry later */
3792 dev->ibd_next_failover = ktime_get_seconds() +
3793 min(dev->ibd_failed_failover, 10);
3794 if (kiblnd_dev_can_failover(dev)) {
3795 list_add_tail(&dev->ibd_fail_list,
3796 &kiblnd_data.kib_failed_devs);
3802 /* long sleep if no more pending failover */
3803 long_sleep = list_empty(&kiblnd_data.kib_failed_devs);
3805 set_current_state(TASK_INTERRUPTIBLE);
3806 add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3807 write_unlock_irqrestore(glock, flags);
3809 rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
3810 cfs_time_seconds(1));
3811 set_current_state(TASK_RUNNING);
3812 remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
3813 write_lock_irqsave(glock, flags);
3815 if (!long_sleep || rc != 0)
3818 /* have a long sleep, routine check all active devices,
3819 * we need checking like this because if there is not active
3820 * connection on the dev and no SEND from local, we may listen
3821 * on wrong HCA for ever while there is a bonding failover */
3822 list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3823 if (kiblnd_dev_can_failover(dev)) {
3824 list_add_tail(&dev->ibd_fail_list,
3825 &kiblnd_data.kib_failed_devs);
3830 write_unlock_irqrestore(glock, flags);
3832 kiblnd_thread_fini();