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) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/lnet/lib-move.c
34 * Data movement routines
37 #define DEBUG_SUBSYSTEM S_LNET
39 #include <lnet/lib-lnet.h>
40 #include <linux/nsproxy.h>
41 #include <net/net_namespace.h>
43 static int local_nid_dist_zero = 1;
44 module_param(local_nid_dist_zero, int, 0444);
45 MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
48 lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
52 struct list_head *next;
53 struct list_head cull;
55 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
57 /* Adding a new entry */
58 LIBCFS_ALLOC(tp, sizeof(*tp));
63 tp->tp_threshold = threshold;
66 list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
71 /* removing entries */
72 INIT_LIST_HEAD(&cull);
76 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
77 tp = list_entry(el, lnet_test_peer_t, tp_list);
79 if (tp->tp_threshold == 0 || /* needs culling anyway */
80 nid == LNET_NID_ANY || /* removing all entries */
81 tp->tp_nid == nid) { /* matched this one */
82 list_del(&tp->tp_list);
83 list_add(&tp->tp_list, &cull);
89 while (!list_empty(&cull)) {
90 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
92 list_del(&tp->tp_list);
93 LIBCFS_FREE(tp, sizeof(*tp));
99 fail_peer (lnet_nid_t nid, int outgoing)
101 lnet_test_peer_t *tp;
102 struct list_head *el;
103 struct list_head *next;
104 struct list_head cull;
107 INIT_LIST_HEAD(&cull);
109 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
112 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
113 tp = list_entry(el, lnet_test_peer_t, tp_list);
115 if (tp->tp_threshold == 0) {
118 /* only cull zombies on outgoing tests,
119 * since we may be at interrupt priority on
120 * incoming messages. */
121 list_del(&tp->tp_list);
122 list_add(&tp->tp_list, &cull);
127 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
128 nid == tp->tp_nid) { /* fail this peer */
131 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
134 tp->tp_threshold == 0) {
136 list_del(&tp->tp_list);
137 list_add(&tp->tp_list, &cull);
146 while (!list_empty(&cull)) {
147 tp = list_entry(cull.next, lnet_test_peer_t, tp_list);
148 list_del(&tp->tp_list);
150 LIBCFS_FREE(tp, sizeof(*tp));
157 lnet_iov_nob(unsigned int niov, struct kvec *iov)
159 unsigned int nob = 0;
161 LASSERT(niov == 0 || iov != NULL);
163 nob += (iov++)->iov_len;
167 EXPORT_SYMBOL(lnet_iov_nob);
170 lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset,
171 unsigned int nsiov, struct kvec *siov, unsigned int soffset,
174 /* NB diov, siov are READ-ONLY */
175 unsigned int this_nob;
180 /* skip complete frags before 'doffset' */
182 while (doffset >= diov->iov_len) {
183 doffset -= diov->iov_len;
189 /* skip complete frags before 'soffset' */
191 while (soffset >= siov->iov_len) {
192 soffset -= siov->iov_len;
201 this_nob = MIN(diov->iov_len - doffset,
202 siov->iov_len - soffset);
203 this_nob = MIN(this_nob, nob);
205 memcpy((char *)diov->iov_base + doffset,
206 (char *)siov->iov_base + soffset, this_nob);
209 if (diov->iov_len > doffset + this_nob) {
217 if (siov->iov_len > soffset + this_nob) {
226 EXPORT_SYMBOL(lnet_copy_iov2iov);
229 lnet_extract_iov(int dst_niov, struct kvec *dst,
230 int src_niov, struct kvec *src,
231 unsigned int offset, unsigned int len)
233 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
234 * for exactly 'len' bytes, and return the number of entries.
235 * NB not destructive to 'src' */
236 unsigned int frag_len;
239 if (len == 0) /* no data => */
240 return (0); /* no frags */
242 LASSERT(src_niov > 0);
243 while (offset >= src->iov_len) { /* skip initial frags */
244 offset -= src->iov_len;
247 LASSERT(src_niov > 0);
252 LASSERT(src_niov > 0);
253 LASSERT((int)niov <= dst_niov);
255 frag_len = src->iov_len - offset;
256 dst->iov_base = ((char *)src->iov_base) + offset;
258 if (len <= frag_len) {
263 dst->iov_len = frag_len;
273 EXPORT_SYMBOL(lnet_extract_iov);
277 lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov)
279 unsigned int nob = 0;
281 LASSERT(niov == 0 || kiov != NULL);
283 nob += (kiov++)->kiov_len;
287 EXPORT_SYMBOL(lnet_kiov_nob);
290 lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
291 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
294 /* NB diov, siov are READ-ONLY */
295 unsigned int this_nob;
302 LASSERT (!in_interrupt ());
305 while (doffset >= diov->kiov_len) {
306 doffset -= diov->kiov_len;
313 while (soffset >= siov->kiov_len) {
314 soffset -= siov->kiov_len;
323 this_nob = MIN(diov->kiov_len - doffset,
324 siov->kiov_len - soffset);
325 this_nob = MIN(this_nob, nob);
328 daddr = ((char *)kmap(diov->kiov_page)) +
329 diov->kiov_offset + doffset;
331 saddr = ((char *)kmap(siov->kiov_page)) +
332 siov->kiov_offset + soffset;
334 /* Vanishing risk of kmap deadlock when mapping 2 pages.
335 * However in practice at least one of the kiovs will be mapped
336 * kernel pages and the map/unmap will be NOOPs */
338 memcpy (daddr, saddr, this_nob);
341 if (diov->kiov_len > doffset + this_nob) {
345 kunmap(diov->kiov_page);
352 if (siov->kiov_len > soffset + this_nob) {
356 kunmap(siov->kiov_page);
365 kunmap(diov->kiov_page);
367 kunmap(siov->kiov_page);
369 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
372 lnet_copy_kiov2iov (unsigned int niov, struct kvec *iov, unsigned int iovoffset,
373 unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
376 /* NB iov, kiov are READ-ONLY */
377 unsigned int this_nob;
383 LASSERT (!in_interrupt ());
386 while (iovoffset >= iov->iov_len) {
387 iovoffset -= iov->iov_len;
394 while (kiovoffset >= kiov->kiov_len) {
395 kiovoffset -= kiov->kiov_len;
404 this_nob = MIN(iov->iov_len - iovoffset,
405 kiov->kiov_len - kiovoffset);
406 this_nob = MIN(this_nob, nob);
409 addr = ((char *)kmap(kiov->kiov_page)) +
410 kiov->kiov_offset + kiovoffset;
412 memcpy((char *)iov->iov_base + iovoffset, addr, this_nob);
415 if (iov->iov_len > iovoffset + this_nob) {
416 iovoffset += this_nob;
423 if (kiov->kiov_len > kiovoffset + this_nob) {
425 kiovoffset += this_nob;
427 kunmap(kiov->kiov_page);
437 kunmap(kiov->kiov_page);
439 EXPORT_SYMBOL(lnet_copy_kiov2iov);
442 lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
443 unsigned int niov, struct kvec *iov, unsigned int iovoffset,
446 /* NB kiov, iov are READ-ONLY */
447 unsigned int this_nob;
453 LASSERT (!in_interrupt ());
456 while (kiovoffset >= kiov->kiov_len) {
457 kiovoffset -= kiov->kiov_len;
464 while (iovoffset >= iov->iov_len) {
465 iovoffset -= iov->iov_len;
474 this_nob = MIN(kiov->kiov_len - kiovoffset,
475 iov->iov_len - iovoffset);
476 this_nob = MIN(this_nob, nob);
479 addr = ((char *)kmap(kiov->kiov_page)) +
480 kiov->kiov_offset + kiovoffset;
482 memcpy (addr, (char *)iov->iov_base + iovoffset, this_nob);
485 if (kiov->kiov_len > kiovoffset + this_nob) {
487 kiovoffset += this_nob;
489 kunmap(kiov->kiov_page);
496 if (iov->iov_len > iovoffset + this_nob) {
497 iovoffset += this_nob;
506 kunmap(kiov->kiov_page);
508 EXPORT_SYMBOL(lnet_copy_iov2kiov);
511 lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst,
512 int src_niov, lnet_kiov_t *src,
513 unsigned int offset, unsigned int len)
515 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
516 * for exactly 'len' bytes, and return the number of entries.
517 * NB not destructive to 'src' */
518 unsigned int frag_len;
521 if (len == 0) /* no data => */
522 return (0); /* no frags */
524 LASSERT(src_niov > 0);
525 while (offset >= src->kiov_len) { /* skip initial frags */
526 offset -= src->kiov_len;
529 LASSERT(src_niov > 0);
534 LASSERT(src_niov > 0);
535 LASSERT((int)niov <= dst_niov);
537 frag_len = src->kiov_len - offset;
538 dst->kiov_page = src->kiov_page;
539 dst->kiov_offset = src->kiov_offset + offset;
541 if (len <= frag_len) {
543 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
547 dst->kiov_len = frag_len;
548 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
558 EXPORT_SYMBOL(lnet_extract_kiov);
561 lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
562 unsigned int offset, unsigned int mlen, unsigned int rlen)
564 unsigned int niov = 0;
565 struct kvec *iov = NULL;
566 lnet_kiov_t *kiov = NULL;
569 LASSERT (!in_interrupt ());
570 LASSERT (mlen == 0 || msg != NULL);
573 LASSERT(msg->msg_receiving);
574 LASSERT(!msg->msg_sending);
575 LASSERT(rlen == msg->msg_len);
576 LASSERT(mlen <= msg->msg_len);
577 LASSERT(msg->msg_offset == offset);
578 LASSERT(msg->msg_wanted == mlen);
580 msg->msg_receiving = 0;
583 niov = msg->msg_niov;
585 kiov = msg->msg_kiov;
588 LASSERT ((iov == NULL) != (kiov == NULL));
592 rc = (ni->ni_net->net_lnd->lnd_recv)(ni, private, msg, delayed,
593 niov, iov, kiov, offset, mlen,
596 lnet_finalize(ni, msg, rc);
600 lnet_setpayloadbuffer(lnet_msg_t *msg)
602 lnet_libmd_t *md = msg->msg_md;
604 LASSERT(msg->msg_len > 0);
605 LASSERT(!msg->msg_routing);
607 LASSERT(msg->msg_niov == 0);
608 LASSERT(msg->msg_iov == NULL);
609 LASSERT(msg->msg_kiov == NULL);
611 msg->msg_niov = md->md_niov;
612 if ((md->md_options & LNET_MD_KIOV) != 0)
613 msg->msg_kiov = md->md_iov.kiov;
615 msg->msg_iov = md->md_iov.iov;
619 lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target,
620 unsigned int offset, unsigned int len)
622 msg->msg_type = type;
623 msg->msg_target = target;
625 msg->msg_offset = offset;
628 lnet_setpayloadbuffer(msg);
630 memset (&msg->msg_hdr, 0, sizeof (msg->msg_hdr));
631 msg->msg_hdr.type = cpu_to_le32(type);
632 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
633 /* src_nid will be set later */
634 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
635 msg->msg_hdr.payload_length = cpu_to_le32(len);
639 lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg)
641 void *priv = msg->msg_private;
644 LASSERT (!in_interrupt ());
645 LASSERT (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
646 (msg->msg_txcredit && msg->msg_peertxcredit));
648 rc = (ni->ni_net->net_lnd->lnd_send)(ni, priv, msg);
650 lnet_finalize(ni, msg, rc);
654 lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg)
658 LASSERT(!msg->msg_sending);
659 LASSERT(msg->msg_receiving);
660 LASSERT(!msg->msg_rx_ready_delay);
661 LASSERT(ni->ni_net->net_lnd->lnd_eager_recv != NULL);
663 msg->msg_rx_ready_delay = 1;
664 rc = (ni->ni_net->net_lnd->lnd_eager_recv)(ni, msg->msg_private, msg,
667 CERROR("recv from %s / send to %s aborted: "
668 "eager_recv failed %d\n",
669 libcfs_nid2str(msg->msg_rxpeer->lpni_nid),
670 libcfs_id2str(msg->msg_target), rc);
671 LASSERT(rc < 0); /* required by my callers */
678 * This function can be called from two paths:
679 * 1. when sending a message
680 * 2. when decommiting a message (lnet_msg_decommit_tx())
681 * In both these cases the peer_ni should have it's reference count
682 * acquired by the caller and therefore it is safe to drop the spin
683 * lock before calling lnd_query()
686 lnet_ni_query_locked(lnet_ni_t *ni, struct lnet_peer_ni *lp)
688 cfs_time_t last_alive = 0;
689 int cpt = lnet_cpt_of_nid_locked(lp->lpni_nid, ni);
691 LASSERT(lnet_peer_aliveness_enabled(lp));
692 LASSERT(ni->ni_net->net_lnd->lnd_query != NULL);
694 lnet_net_unlock(cpt);
695 (ni->ni_net->net_lnd->lnd_query)(ni, lp->lpni_nid, &last_alive);
698 lp->lpni_last_query = cfs_time_current();
700 if (last_alive != 0) /* NI has updated timestamp */
701 lp->lpni_last_alive = last_alive;
704 /* NB: always called with lnet_net_lock held */
706 lnet_peer_is_alive (struct lnet_peer_ni *lp, cfs_time_t now)
711 LASSERT (lnet_peer_aliveness_enabled(lp));
714 * Trust lnet_notify() if it has more recent aliveness news, but
715 * ignore the initial assumed death (see lnet_peers_start_down()).
717 spin_lock(&lp->lpni_lock);
718 if (!lp->lpni_alive && lp->lpni_alive_count > 0 &&
719 cfs_time_aftereq(lp->lpni_timestamp, lp->lpni_last_alive)) {
720 spin_unlock(&lp->lpni_lock);
725 cfs_time_add(lp->lpni_last_alive,
726 cfs_time_seconds(lp->lpni_net->net_tunables.
728 alive = cfs_time_after(deadline, now);
731 * Update obsolete lp_alive except for routers assumed to be dead
732 * initially, because router checker would update aliveness in this
733 * case, and moreover lpni_last_alive at peer creation is assumed.
735 if (alive && !lp->lpni_alive &&
736 !(lnet_isrouter(lp) && lp->lpni_alive_count == 0)) {
737 spin_unlock(&lp->lpni_lock);
738 lnet_notify_locked(lp, 0, 1, lp->lpni_last_alive);
740 spin_unlock(&lp->lpni_lock);
747 /* NB: returns 1 when alive, 0 when dead, negative when error;
748 * may drop the lnet_net_lock */
750 lnet_peer_alive_locked (struct lnet_ni *ni, struct lnet_peer_ni *lp)
752 cfs_time_t now = cfs_time_current();
754 if (!lnet_peer_aliveness_enabled(lp))
757 if (lnet_peer_is_alive(lp, now))
761 * Peer appears dead, but we should avoid frequent NI queries (at
762 * most once per lnet_queryinterval seconds).
764 if (lp->lpni_last_query != 0) {
765 static const int lnet_queryinterval = 1;
767 cfs_time_t next_query =
768 cfs_time_add(lp->lpni_last_query,
769 cfs_time_seconds(lnet_queryinterval));
771 if (cfs_time_before(now, next_query)) {
773 CWARN("Unexpected aliveness of peer %s: "
775 libcfs_nid2str(lp->lpni_nid),
776 (int)now, (int)next_query,
778 lp->lpni_net->net_tunables.lct_peer_timeout);
783 /* query NI for latest aliveness news */
784 lnet_ni_query_locked(ni, lp);
786 if (lnet_peer_is_alive(lp, now))
789 lnet_notify_locked(lp, 0, 0, lp->lpni_last_alive);
794 * \param msg The message to be sent.
795 * \param do_send True if lnet_ni_send() should be called in this function.
796 * lnet_send() is going to lnet_net_unlock immediately after this, so
797 * it sets do_send FALSE and I don't do the unlock/send/lock bit.
799 * \retval LNET_CREDIT_OK If \a msg sent or OK to send.
800 * \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
801 * \retval -EHOSTUNREACH If the next hop of the message appears dead.
802 * \retval -ECANCELED If the MD of the message has been unlinked.
805 lnet_post_send_locked(lnet_msg_t *msg, int do_send)
807 struct lnet_peer_ni *lp = msg->msg_txpeer;
808 struct lnet_ni *ni = msg->msg_txni;
809 int cpt = msg->msg_tx_cpt;
810 struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt];
812 /* non-lnet_send() callers have checked before */
813 LASSERT(!do_send || msg->msg_tx_delayed);
814 LASSERT(!msg->msg_receiving);
815 LASSERT(msg->msg_tx_committed);
817 /* NB 'lp' is always the next hop */
818 if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
819 lnet_peer_alive_locked(ni, lp) == 0) {
820 the_lnet.ln_counters[cpt]->drop_count++;
821 the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
822 lnet_net_unlock(cpt);
824 atomic_inc(&msg->msg_txpeer->lpni_stats.drop_count);
826 atomic_inc(&msg->msg_txni->ni_stats.drop_count);
828 CNETERR("Dropping message for %s: peer not alive\n",
829 libcfs_id2str(msg->msg_target));
831 lnet_finalize(ni, msg, -EHOSTUNREACH);
834 return -EHOSTUNREACH;
837 if (msg->msg_md != NULL &&
838 (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED) != 0) {
839 lnet_net_unlock(cpt);
841 CNETERR("Aborting message for %s: LNetM[DE]Unlink() already "
842 "called on the MD/ME.\n",
843 libcfs_id2str(msg->msg_target));
845 lnet_finalize(ni, msg, -ECANCELED);
851 if (!msg->msg_peertxcredit) {
852 spin_lock(&lp->lpni_lock);
853 LASSERT((lp->lpni_txcredits < 0) ==
854 !list_empty(&lp->lpni_txq));
856 msg->msg_peertxcredit = 1;
857 lp->lpni_txqnob += msg->msg_len + sizeof(lnet_hdr_t);
858 lp->lpni_txcredits--;
860 if (lp->lpni_txcredits < lp->lpni_mintxcredits)
861 lp->lpni_mintxcredits = lp->lpni_txcredits;
863 if (lp->lpni_txcredits < 0) {
864 msg->msg_tx_delayed = 1;
865 list_add_tail(&msg->msg_list, &lp->lpni_txq);
866 spin_unlock(&lp->lpni_lock);
867 return LNET_CREDIT_WAIT;
869 spin_unlock(&lp->lpni_lock);
872 if (!msg->msg_txcredit) {
873 LASSERT((tq->tq_credits < 0) ==
874 !list_empty(&tq->tq_delayed));
876 msg->msg_txcredit = 1;
878 atomic_dec(&ni->ni_tx_credits);
880 if (tq->tq_credits < tq->tq_credits_min)
881 tq->tq_credits_min = tq->tq_credits;
883 if (tq->tq_credits < 0) {
884 msg->msg_tx_delayed = 1;
885 list_add_tail(&msg->msg_list, &tq->tq_delayed);
886 return LNET_CREDIT_WAIT;
891 lnet_net_unlock(cpt);
892 lnet_ni_send(ni, msg);
895 return LNET_CREDIT_OK;
899 static lnet_rtrbufpool_t *
900 lnet_msg2bufpool(lnet_msg_t *msg)
902 lnet_rtrbufpool_t *rbp;
905 LASSERT(msg->msg_rx_committed);
907 cpt = msg->msg_rx_cpt;
908 rbp = &the_lnet.ln_rtrpools[cpt][0];
910 LASSERT(msg->msg_len <= LNET_MTU);
911 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_SIZE) {
913 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
920 lnet_post_routed_recv_locked (lnet_msg_t *msg, int do_recv)
922 /* lnet_parse is going to lnet_net_unlock immediately after this, so it
923 * sets do_recv FALSE and I don't do the unlock/send/lock bit.
924 * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
925 * received or OK to receive */
926 struct lnet_peer_ni *lp = msg->msg_rxpeer;
927 lnet_rtrbufpool_t *rbp;
930 LASSERT (msg->msg_iov == NULL);
931 LASSERT (msg->msg_kiov == NULL);
932 LASSERT (msg->msg_niov == 0);
933 LASSERT (msg->msg_routing);
934 LASSERT (msg->msg_receiving);
935 LASSERT (!msg->msg_sending);
937 /* non-lnet_parse callers only receive delayed messages */
938 LASSERT(!do_recv || msg->msg_rx_delayed);
940 if (!msg->msg_peerrtrcredit) {
941 spin_lock(&lp->lpni_lock);
942 LASSERT((lp->lpni_rtrcredits < 0) ==
943 !list_empty(&lp->lpni_rtrq));
945 msg->msg_peerrtrcredit = 1;
946 lp->lpni_rtrcredits--;
947 if (lp->lpni_rtrcredits < lp->lpni_minrtrcredits)
948 lp->lpni_minrtrcredits = lp->lpni_rtrcredits;
950 if (lp->lpni_rtrcredits < 0) {
951 /* must have checked eager_recv before here */
952 LASSERT(msg->msg_rx_ready_delay);
953 msg->msg_rx_delayed = 1;
954 list_add_tail(&msg->msg_list, &lp->lpni_rtrq);
955 spin_unlock(&lp->lpni_lock);
956 return LNET_CREDIT_WAIT;
958 spin_unlock(&lp->lpni_lock);
961 rbp = lnet_msg2bufpool(msg);
963 if (!msg->msg_rtrcredit) {
964 msg->msg_rtrcredit = 1;
966 if (rbp->rbp_credits < rbp->rbp_mincredits)
967 rbp->rbp_mincredits = rbp->rbp_credits;
969 if (rbp->rbp_credits < 0) {
970 /* must have checked eager_recv before here */
971 LASSERT(msg->msg_rx_ready_delay);
972 msg->msg_rx_delayed = 1;
973 list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
974 return LNET_CREDIT_WAIT;
978 LASSERT(!list_empty(&rbp->rbp_bufs));
979 rb = list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list);
980 list_del(&rb->rb_list);
982 msg->msg_niov = rbp->rbp_npages;
983 msg->msg_kiov = &rb->rb_kiov[0];
986 int cpt = msg->msg_rx_cpt;
988 lnet_net_unlock(cpt);
989 lnet_ni_recv(msg->msg_rxni, msg->msg_private, msg, 1,
990 0, msg->msg_len, msg->msg_len);
993 return LNET_CREDIT_OK;
997 lnet_return_tx_credits_locked(lnet_msg_t *msg)
999 struct lnet_peer_ni *txpeer = msg->msg_txpeer;
1000 struct lnet_ni *txni = msg->msg_txni;
1003 if (msg->msg_txcredit) {
1004 struct lnet_ni *ni = msg->msg_txni;
1005 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
1007 /* give back NI txcredits */
1008 msg->msg_txcredit = 0;
1010 LASSERT((tq->tq_credits < 0) ==
1011 !list_empty(&tq->tq_delayed));
1014 atomic_inc(&ni->ni_tx_credits);
1015 if (tq->tq_credits <= 0) {
1016 msg2 = list_entry(tq->tq_delayed.next,
1017 lnet_msg_t, msg_list);
1018 list_del(&msg2->msg_list);
1020 LASSERT(msg2->msg_txni == ni);
1021 LASSERT(msg2->msg_tx_delayed);
1022 LASSERT(msg2->msg_tx_cpt == msg->msg_tx_cpt);
1024 (void) lnet_post_send_locked(msg2, 1);
1028 if (msg->msg_peertxcredit) {
1029 /* give back peer txcredits */
1030 msg->msg_peertxcredit = 0;
1032 spin_lock(&txpeer->lpni_lock);
1033 LASSERT((txpeer->lpni_txcredits < 0) ==
1034 !list_empty(&txpeer->lpni_txq));
1036 txpeer->lpni_txqnob -= msg->msg_len + sizeof(lnet_hdr_t);
1037 LASSERT(txpeer->lpni_txqnob >= 0);
1039 txpeer->lpni_txcredits++;
1040 if (txpeer->lpni_txcredits <= 0) {
1041 msg2 = list_entry(txpeer->lpni_txq.next,
1042 lnet_msg_t, msg_list);
1043 list_del(&msg2->msg_list);
1044 spin_unlock(&txpeer->lpni_lock);
1046 LASSERT(msg2->msg_txpeer == txpeer);
1047 LASSERT(msg2->msg_tx_delayed);
1049 if (msg2->msg_tx_cpt != msg->msg_tx_cpt) {
1050 lnet_net_unlock(msg->msg_tx_cpt);
1051 lnet_net_lock(msg2->msg_tx_cpt);
1053 (void) lnet_post_send_locked(msg2, 1);
1054 if (msg2->msg_tx_cpt != msg->msg_tx_cpt) {
1055 lnet_net_unlock(msg2->msg_tx_cpt);
1056 lnet_net_lock(msg->msg_tx_cpt);
1059 spin_unlock(&txpeer->lpni_lock);
1064 msg->msg_txni = NULL;
1065 lnet_ni_decref_locked(txni, msg->msg_tx_cpt);
1068 if (txpeer != NULL) {
1071 * Once the patch for the health comes in we need to set
1072 * the health of the peer ni to bad when we fail to send
1074 * int status = msg->msg_ev.status;
1076 * lnet_set_peer_ni_health_locked(txpeer, false)
1078 msg->msg_txpeer = NULL;
1079 lnet_peer_ni_decref_locked(txpeer);
1084 lnet_schedule_blocked_locked(lnet_rtrbufpool_t *rbp)
1088 if (list_empty(&rbp->rbp_msgs))
1090 msg = list_entry(rbp->rbp_msgs.next,
1091 lnet_msg_t, msg_list);
1092 list_del(&msg->msg_list);
1094 (void)lnet_post_routed_recv_locked(msg, 1);
1098 lnet_drop_routed_msgs_locked(struct list_head *list, int cpt)
1103 lnet_net_unlock(cpt);
1105 list_for_each_entry_safe(msg, tmp, list, msg_list) {
1106 lnet_ni_recv(msg->msg_rxni, msg->msg_private, NULL,
1107 0, 0, 0, msg->msg_hdr.payload_length);
1108 list_del_init(&msg->msg_list);
1109 lnet_finalize(NULL, msg, -ECANCELED);
1116 lnet_return_rx_credits_locked(lnet_msg_t *msg)
1118 struct lnet_peer_ni *rxpeer = msg->msg_rxpeer;
1119 struct lnet_ni *rxni = msg->msg_rxni;
1122 if (msg->msg_rtrcredit) {
1123 /* give back global router credits */
1125 lnet_rtrbufpool_t *rbp;
1127 /* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1128 * there until it gets one allocated, or aborts the wait
1130 LASSERT(msg->msg_kiov != NULL);
1132 rb = list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]);
1135 msg->msg_kiov = NULL;
1136 msg->msg_rtrcredit = 0;
1138 LASSERT(rbp == lnet_msg2bufpool(msg));
1140 LASSERT((rbp->rbp_credits > 0) ==
1141 !list_empty(&rbp->rbp_bufs));
1143 /* If routing is now turned off, we just drop this buffer and
1144 * don't bother trying to return credits. */
1145 if (!the_lnet.ln_routing) {
1146 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1150 /* It is possible that a user has lowered the desired number of
1151 * buffers in this pool. Make sure we never put back
1152 * more buffers than the stated number. */
1153 if (unlikely(rbp->rbp_credits >= rbp->rbp_req_nbuffers)) {
1154 /* Discard this buffer so we don't have too
1156 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1157 rbp->rbp_nbuffers--;
1159 list_add(&rb->rb_list, &rbp->rbp_bufs);
1161 if (rbp->rbp_credits <= 0)
1162 lnet_schedule_blocked_locked(rbp);
1167 if (msg->msg_peerrtrcredit) {
1168 /* give back peer router credits */
1169 msg->msg_peerrtrcredit = 0;
1171 spin_lock(&rxpeer->lpni_lock);
1172 LASSERT((rxpeer->lpni_rtrcredits < 0) ==
1173 !list_empty(&rxpeer->lpni_rtrq));
1175 rxpeer->lpni_rtrcredits++;
1177 /* drop all messages which are queued to be routed on that
1179 if (!the_lnet.ln_routing) {
1180 struct list_head drop;
1181 INIT_LIST_HEAD(&drop);
1182 list_splice_init(&rxpeer->lpni_rtrq, &drop);
1183 spin_unlock(&rxpeer->lpni_lock);
1184 lnet_drop_routed_msgs_locked(&drop, msg->msg_rx_cpt);
1185 } else if (rxpeer->lpni_rtrcredits <= 0) {
1186 msg2 = list_entry(rxpeer->lpni_rtrq.next,
1187 lnet_msg_t, msg_list);
1188 list_del(&msg2->msg_list);
1189 spin_unlock(&rxpeer->lpni_lock);
1190 (void) lnet_post_routed_recv_locked(msg2, 1);
1192 spin_unlock(&rxpeer->lpni_lock);
1196 msg->msg_rxni = NULL;
1197 lnet_ni_decref_locked(rxni, msg->msg_rx_cpt);
1199 if (rxpeer != NULL) {
1200 msg->msg_rxpeer = NULL;
1201 lnet_peer_ni_decref_locked(rxpeer);
1206 lnet_compare_peers(struct lnet_peer_ni *p1, struct lnet_peer_ni *p2)
1208 if (p1->lpni_txqnob < p2->lpni_txqnob)
1211 if (p1->lpni_txqnob > p2->lpni_txqnob)
1214 if (p1->lpni_txcredits > p2->lpni_txcredits)
1217 if (p1->lpni_txcredits < p2->lpni_txcredits)
1224 lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2)
1226 struct lnet_peer_ni *p1 = r1->lr_gateway;
1227 struct lnet_peer_ni *p2 = r2->lr_gateway;
1228 int r1_hops = (r1->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r1->lr_hops;
1229 int r2_hops = (r2->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r2->lr_hops;
1232 if (r1->lr_priority < r2->lr_priority)
1235 if (r1->lr_priority > r2->lr_priority)
1238 if (r1_hops < r2_hops)
1241 if (r1_hops > r2_hops)
1244 rc = lnet_compare_peers(p1, p2);
1248 if (r1->lr_seq - r2->lr_seq <= 0)
1254 static struct lnet_peer_ni *
1255 lnet_find_route_locked(struct lnet_net *net, lnet_nid_t target,
1258 lnet_remotenet_t *rnet;
1259 lnet_route_t *route;
1260 lnet_route_t *best_route;
1261 lnet_route_t *last_route;
1262 struct lnet_peer_ni *lpni_best;
1263 struct lnet_peer_ni *lp;
1266 /* If @rtr_nid is not LNET_NID_ANY, return the gateway with
1267 * rtr_nid nid, otherwise find the best gateway I can use */
1269 rnet = lnet_find_rnet_locked(LNET_NIDNET(target));
1274 best_route = last_route = NULL;
1275 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
1276 lp = route->lr_gateway;
1278 if (!lnet_is_route_alive(route))
1281 if (net != NULL && lp->lpni_net != net)
1284 if (lp->lpni_nid == rtr_nid) /* it's pre-determined router */
1287 if (lpni_best == NULL) {
1288 best_route = last_route = route;
1293 /* no protection on below fields, but it's harmless */
1294 if (last_route->lr_seq - route->lr_seq < 0)
1297 rc = lnet_compare_routes(route, best_route);
1305 /* set sequence number on the best router to the latest sequence + 1
1306 * so we can round-robin all routers, it's race and inaccurate but
1307 * harmless and functional */
1308 if (best_route != NULL)
1309 best_route->lr_seq = last_route->lr_seq + 1;
1313 static struct lnet_ni *
1314 lnet_get_best_ni(struct lnet_net *local_net, struct lnet_ni *cur_ni,
1317 struct lnet_ni *ni = NULL, *best_ni = cur_ni;
1318 unsigned int shortest_distance;
1321 if (best_ni == NULL) {
1322 shortest_distance = UINT_MAX;
1323 best_credits = INT_MIN;
1325 shortest_distance = cfs_cpt_distance(lnet_cpt_table(), md_cpt,
1326 best_ni->ni_dev_cpt);
1327 best_credits = atomic_read(&best_ni->ni_tx_credits);
1330 while ((ni = lnet_get_next_ni_locked(local_net, ni))) {
1331 unsigned int distance;
1334 if (!lnet_is_ni_healthy_locked(ni))
1337 ni_credits = atomic_read(&ni->ni_tx_credits);
1340 * calculate the distance from the CPT on which
1341 * the message memory is allocated to the CPT of
1342 * the NI's physical device
1344 distance = cfs_cpt_distance(lnet_cpt_table(),
1349 * All distances smaller than the NUMA range
1350 * are treated equally.
1352 if (distance < lnet_numa_range)
1353 distance = lnet_numa_range;
1356 * Select on shorter distance, then available
1357 * credits, then round-robin.
1359 if (distance > shortest_distance) {
1361 } else if (distance < shortest_distance) {
1362 shortest_distance = distance;
1363 } else if (ni_credits < best_credits) {
1365 } else if (ni_credits == best_credits) {
1366 if (best_ni && (best_ni)->ni_seq <= ni->ni_seq)
1370 best_credits = ni_credits;
1377 lnet_select_pathway(lnet_nid_t src_nid, lnet_nid_t dst_nid,
1378 struct lnet_msg *msg, lnet_nid_t rtr_nid)
1380 struct lnet_ni *best_ni;
1381 struct lnet_peer_ni *best_lpni;
1382 struct lnet_peer_ni *best_gw;
1383 struct lnet_peer_ni *lpni;
1384 struct lnet_peer_ni *final_dst;
1385 struct lnet_peer *peer;
1386 struct lnet_peer_net *peer_net;
1387 struct lnet_net *local_net;
1395 int best_lpni_credits;
1399 * get an initial CPT to use for locking. The idea here is not to
1400 * serialize the calls to select_pathway, so that as many
1401 * operations can run concurrently as possible. To do that we use
1402 * the CPT where this call is being executed. Later on when we
1403 * determine the CPT to use in lnet_message_commit, we switch the
1404 * lock and check if there was any configuration change. If none,
1405 * then we proceed, if there is, then we restart the operation.
1407 cpt = lnet_net_lock_current();
1416 local_found = false;
1418 seq = lnet_get_dlc_seq_locked();
1420 if (the_lnet.ln_shutdown) {
1421 lnet_net_unlock(cpt);
1425 if (msg->msg_md != NULL)
1426 /* get the cpt of the MD, used during NUMA based selection */
1427 md_cpt = lnet_cpt_of_cookie(msg->msg_md->md_lh.lh_cookie);
1429 md_cpt = CFS_CPT_ANY;
1431 peer = lnet_find_or_create_peer_locked(dst_nid, cpt);
1433 lnet_net_unlock(cpt);
1434 return PTR_ERR(peer);
1437 /* If peer is not healthy then can not send anything to it */
1438 if (!lnet_is_peer_healthy_locked(peer)) {
1439 lnet_net_unlock(cpt);
1440 return -EHOSTUNREACH;
1443 if (!peer->lp_multi_rail && lnet_get_num_peer_nis(peer) > 1) {
1444 CERROR("peer %s is declared to be non MR capable, "
1445 "yet configured with more than one NID\n",
1446 libcfs_nid2str(dst_nid));
1451 * STEP 1: first jab at determining best_ni
1452 * if src_nid is explicitly specified, then best_ni is already
1453 * pre-determiend for us. Otherwise we need to select the best
1454 * one to use later on
1456 if (src_nid != LNET_NID_ANY) {
1457 best_ni = lnet_nid2ni_locked(src_nid, cpt);
1459 lnet_net_unlock(cpt);
1460 LCONSOLE_WARN("Can't send to %s: src %s is not a "
1461 "local nid\n", libcfs_nid2str(dst_nid),
1462 libcfs_nid2str(src_nid));
1467 if (msg->msg_type == LNET_MSG_REPLY ||
1468 msg->msg_type == LNET_MSG_ACK ||
1469 !peer->lp_multi_rail) {
1471 * for replies we want to respond on the same peer_ni we
1472 * received the message on if possible. If not, then pick
1473 * a peer_ni to send to
1475 * if the peer is non-multi-rail then you want to send to
1476 * the dst_nid provided as well.
1478 * It is expected to find the lpni using dst_nid, since we
1479 * created it earlier.
1481 best_lpni = lnet_find_peer_ni_locked(dst_nid);
1483 lnet_peer_ni_decref_locked(best_lpni);
1485 if (best_lpni && !lnet_get_net_locked(LNET_NIDNET(dst_nid))) {
1487 * this lpni is not on a local network so we need
1488 * to route this reply.
1490 best_gw = lnet_find_route_locked(NULL,
1491 best_lpni->lpni_nid,
1495 * RULE: Each node considers only the next-hop
1497 * We're going to route the message, so change the peer to
1500 LASSERT(best_gw->lpni_peer_net);
1501 LASSERT(best_gw->lpni_peer_net->lpn_peer);
1502 peer = best_gw->lpni_peer_net->lpn_peer;
1505 * if the router is not multi-rail then use the best_gw
1506 * found to send the message to
1508 if (!peer->lp_multi_rail)
1509 best_lpni = best_gw;
1517 } else if (!best_lpni) {
1518 lnet_net_unlock(cpt);
1519 CERROR("unable to send msg_type %d to "
1520 "originating %s. Destination NID not in DB\n",
1521 msg->msg_type, libcfs_nid2str(dst_nid));
1527 * if the peer is not MR capable, then we should always send to it
1528 * using the first NI in the NET we determined.
1530 if (!peer->lp_multi_rail) {
1532 lnet_net_unlock(cpt);
1533 CERROR("no route to %s\n",
1534 libcfs_nid2str(dst_nid));
1535 return -EHOSTUNREACH;
1538 /* best ni could be set because src_nid was provided */
1540 best_ni = lnet_net2ni_locked(best_lpni->lpni_net->net_id, cpt);
1542 lnet_net_unlock(cpt);
1543 CERROR("no path to %s from net %s\n",
1544 libcfs_nid2str(best_lpni->lpni_nid),
1545 libcfs_net2str(best_lpni->lpni_net->net_id));
1546 return -EHOSTUNREACH;
1551 if (best_ni == the_lnet.ln_loni) {
1552 /* No send credit hassles with LOLND */
1553 lnet_ni_addref_locked(best_ni, cpt);
1554 msg->msg_hdr.dest_nid = cpu_to_le64(best_ni->ni_nid);
1555 if (!msg->msg_routing)
1556 msg->msg_hdr.src_nid = cpu_to_le64(best_ni->ni_nid);
1557 msg->msg_target.nid = best_ni->ni_nid;
1558 lnet_msg_commit(msg, cpt);
1559 msg->msg_txni = best_ni;
1560 lnet_net_unlock(cpt);
1562 return LNET_CREDIT_OK;
1566 * if we already found a best_ni because src_nid is specified and
1567 * best_lpni because we are replying to a message then just send
1570 if (best_ni && best_lpni)
1574 * If we already found a best_ni because src_nid is specified then
1575 * pick the peer then send the message
1581 * pick the best_ni by going through all the possible networks of
1582 * that peer and see which local NI is best suited to talk to that
1585 * Locally connected networks will always be preferred over
1586 * a routed network. If there are only routed paths to the peer,
1587 * then the best route is chosen. If all routes are equal then
1588 * they are used in round robin.
1590 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_on_peer_list) {
1591 if (!lnet_is_peer_net_healthy_locked(peer_net))
1594 local_net = lnet_get_net_locked(peer_net->lpn_net_id);
1595 if (!local_net && !routing && !local_found) {
1596 struct lnet_peer_ni *net_gw;
1598 lpni = list_entry(peer_net->lpn_peer_nis.next,
1599 struct lnet_peer_ni,
1600 lpni_on_peer_net_list);
1602 net_gw = lnet_find_route_locked(NULL,
1610 * lnet_find_route_locked() call
1611 * will return the best_Gw on the
1612 * lpni->lpni_nid network.
1613 * However, best_gw and net_gw can
1614 * be on different networks.
1615 * Therefore need to compare them
1616 * to pick the better of either.
1618 if (lnet_compare_peers(best_gw, net_gw) > 0)
1620 if (best_gw->lpni_gw_seq <= net_gw->lpni_gw_seq)
1635 * a gw on this network is found, but there could be
1636 * other better gateways on other networks. So don't pick
1637 * the best_ni until we determine the best_gw.
1642 /* if no local_net found continue */
1647 * Iterate through the NIs in this local Net and select
1648 * the NI to send from. The selection is determined by
1649 * these 3 criterion in the following priority:
1651 * 2. NI available credits
1654 best_ni = lnet_get_best_ni(local_net, best_ni, md_cpt);
1657 if (!best_ni && !best_gw) {
1658 lnet_net_unlock(cpt);
1659 LCONSOLE_WARN("No local ni found to send from to %s\n",
1660 libcfs_nid2str(dst_nid));
1665 best_ni = lnet_get_best_ni(best_gw->lpni_net, best_ni, md_cpt);
1666 LASSERT(best_gw && best_ni);
1669 * We're going to route the message, so change the peer to
1672 LASSERT(best_gw->lpni_peer_net);
1673 LASSERT(best_gw->lpni_peer_net->lpn_peer);
1674 best_gw->lpni_gw_seq++;
1675 peer = best_gw->lpni_peer_net->lpn_peer;
1679 * Now that we selected the NI to use increment its sequence
1680 * number so the Round Robin algorithm will detect that it has
1681 * been used and pick the next NI.
1687 * At this point the best_ni is on a local network on which
1688 * the peer has a peer_ni as well
1690 peer_net = lnet_peer_get_net_locked(peer,
1691 best_ni->ni_net->net_id);
1693 * peer_net is not available or the src_nid is explicitly defined
1694 * and the peer_net for that src_nid is unhealthy. find a route to
1695 * the destination nid.
1698 (src_nid != LNET_NID_ANY &&
1699 !lnet_is_peer_net_healthy_locked(peer_net))) {
1700 best_gw = lnet_find_route_locked(best_ni->ni_net,
1704 * if no route is found for that network then
1705 * move onto the next peer_ni in the peer
1708 lnet_net_unlock(cpt);
1709 LCONSOLE_WARN("No route to peer from %s\n",
1710 libcfs_nid2str(best_ni->ni_nid));
1711 return -EHOSTUNREACH;
1714 CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
1715 libcfs_nid2str(dst_nid),
1716 libcfs_nid2str(best_gw->lpni_nid),
1717 lnet_msgtyp2str(msg->msg_type), msg->msg_len);
1721 * RULE: Each node considers only the next-hop
1723 * We're going to route the message, so change the peer to
1726 LASSERT(best_gw->lpni_peer_net);
1727 LASSERT(best_gw->lpni_peer_net->lpn_peer);
1728 peer = best_gw->lpni_peer_net->lpn_peer;
1729 } else if (!lnet_is_peer_net_healthy_locked(peer_net)) {
1731 * this peer_net is unhealthy but we still have an opportunity
1732 * to find another peer_net that we can use
1734 __u32 net_id = peer_net->lpn_net_id;
1735 LCONSOLE_WARN("peer net %s unhealthy\n",
1736 libcfs_net2str(net_id));
1741 * Look at the peer NIs for the destination peer that connect
1742 * to the chosen net. If a peer_ni is preferred when using the
1743 * best_ni to communicate, we use that one. If there is no
1744 * preferred peer_ni, or there are multiple preferred peer_ni,
1745 * the available transmit credits are used. If the transmit
1746 * credits are equal, we round-robin over the peer_ni.
1749 best_lpni_credits = INT_MIN;
1752 while ((lpni = lnet_get_next_peer_ni_locked(peer, peer_net, lpni))) {
1754 * if this peer ni is not healthy just skip it, no point in
1755 * examining it further
1757 if (!lnet_is_peer_ni_healthy_locked(lpni))
1759 ni_is_pref = lnet_peer_is_ni_pref_locked(lpni, best_ni);
1761 /* if this is a preferred peer use it */
1762 if (!preferred && ni_is_pref) {
1764 } else if (preferred && !ni_is_pref) {
1766 * this is not the preferred peer so let's ignore
1770 } else if (lpni->lpni_txcredits < best_lpni_credits) {
1772 * We already have a peer that has more credits
1773 * available than this one. No need to consider
1774 * this peer further.
1777 } else if (lpni->lpni_txcredits == best_lpni_credits) {
1779 * The best peer found so far and the current peer
1780 * have the same number of available credits let's
1781 * make sure to select between them using Round
1785 if (best_lpni->lpni_seq <= lpni->lpni_seq)
1791 best_lpni_credits = lpni->lpni_txcredits;
1794 /* if we still can't find a peer ni then we can't reach it */
1796 __u32 net_id = (peer_net) ? peer_net->lpn_net_id :
1797 LNET_NIDNET(dst_nid);
1798 lnet_net_unlock(cpt);
1799 LCONSOLE_WARN("no peer_ni found on peer net %s\n",
1800 libcfs_net2str(net_id));
1801 return -EHOSTUNREACH;
1806 routing = routing || routing2;
1809 * Increment sequence number of the peer selected so that we
1810 * pick the next one in Round Robin.
1812 best_lpni->lpni_seq++;
1815 * grab a reference on the peer_ni so it sticks around even if
1816 * we need to drop and relock the lnet_net_lock below.
1818 lnet_peer_ni_addref_locked(best_lpni);
1821 * Use lnet_cpt_of_nid() to determine the CPT used to commit the
1822 * message. This ensures that we get a CPT that is correct for
1823 * the NI when the NI has been restricted to a subset of all CPTs.
1824 * If the selected CPT differs from the one currently locked, we
1825 * must unlock and relock the lnet_net_lock(), and then check whether
1826 * the configuration has changed. We don't have a hold on the best_ni
1827 * yet, and it may have vanished.
1829 cpt2 = lnet_cpt_of_nid_locked(best_lpni->lpni_nid, best_ni);
1831 lnet_net_unlock(cpt);
1834 if (seq != lnet_get_dlc_seq_locked()) {
1835 lnet_peer_ni_decref_locked(best_lpni);
1841 * store the best_lpni in the message right away to avoid having
1842 * to do the same operation under different conditions
1844 msg->msg_txpeer = best_lpni;
1845 msg->msg_txni = best_ni;
1848 * grab a reference for the best_ni since now it's in use in this
1849 * send. the reference will need to be dropped when the message is
1850 * finished in lnet_finalize()
1852 lnet_ni_addref_locked(msg->msg_txni, cpt);
1855 * Always set the target.nid to the best peer picked. Either the
1856 * nid will be one of the preconfigured NIDs, or the same NID as
1857 * what was originally set in the target or it will be the NID of
1858 * a router if this message should be routed
1860 msg->msg_target.nid = msg->msg_txpeer->lpni_nid;
1863 * lnet_msg_commit assigns the correct cpt to the message, which
1864 * is used to decrement the correct refcount on the ni when it's
1865 * time to return the credits
1867 lnet_msg_commit(msg, cpt);
1870 * If we are routing the message then we don't need to overwrite
1871 * the src_nid since it would've been set at the origin. Otherwise
1872 * we are the originator so we need to set it.
1874 if (!msg->msg_routing)
1875 msg->msg_hdr.src_nid = cpu_to_le64(msg->msg_txni->ni_nid);
1878 msg->msg_target_is_router = 1;
1879 msg->msg_target.pid = LNET_PID_LUSTRE;
1881 * since we're routing we want to ensure that the
1882 * msg_hdr.dest_nid is set to the final destination. When
1883 * the router receives this message it knows how to route
1886 msg->msg_hdr.dest_nid =
1887 cpu_to_le64(final_dst ? final_dst->lpni_nid : dst_nid);
1890 * if we're not routing set the dest_nid to the best peer
1891 * ni that we picked earlier in the algorithm.
1893 msg->msg_hdr.dest_nid = cpu_to_le64(msg->msg_txpeer->lpni_nid);
1896 rc = lnet_post_send_locked(msg, 0);
1898 lnet_net_unlock(cpt);
1904 lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid)
1906 lnet_nid_t dst_nid = msg->msg_target.nid;
1910 * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
1911 * but we might want to use pre-determined router for ACK/REPLY
1914 /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
1915 LASSERT (msg->msg_txpeer == NULL);
1916 LASSERT (!msg->msg_sending);
1917 LASSERT (!msg->msg_target_is_router);
1918 LASSERT (!msg->msg_receiving);
1920 msg->msg_sending = 1;
1922 LASSERT(!msg->msg_tx_committed);
1924 rc = lnet_select_pathway(src_nid, dst_nid, msg, rtr_nid);
1928 if (rc == LNET_CREDIT_OK)
1929 lnet_ni_send(msg->msg_txni, msg);
1931 /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */
1936 lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob)
1939 the_lnet.ln_counters[cpt]->drop_count++;
1940 the_lnet.ln_counters[cpt]->drop_length += nob;
1941 lnet_net_unlock(cpt);
1943 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
1947 lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg)
1949 lnet_hdr_t *hdr = &msg->msg_hdr;
1951 if (msg->msg_wanted != 0)
1952 lnet_setpayloadbuffer(msg);
1954 lnet_build_msg_event(msg, LNET_EVENT_PUT);
1956 /* Must I ACK? If so I'll grab the ack_wmd out of the header and put
1957 * it back into the ACK during lnet_finalize() */
1958 msg->msg_ack = (!lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
1959 (msg->msg_md->md_options & LNET_MD_ACK_DISABLE) == 0);
1961 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
1962 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
1966 lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg)
1968 lnet_hdr_t *hdr = &msg->msg_hdr;
1969 struct lnet_match_info info;
1973 /* Convert put fields to host byte order */
1974 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
1975 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
1976 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
1978 /* Primary peer NID. */
1979 info.mi_id.nid = msg->msg_initiator;
1980 info.mi_id.pid = hdr->src_pid;
1981 info.mi_opc = LNET_MD_OP_PUT;
1982 info.mi_portal = hdr->msg.put.ptl_index;
1983 info.mi_rlength = hdr->payload_length;
1984 info.mi_roffset = hdr->msg.put.offset;
1985 info.mi_mbits = hdr->msg.put.match_bits;
1986 info.mi_cpt = lnet_cpt_of_nid(msg->msg_rxpeer->lpni_nid, ni);
1988 msg->msg_rx_ready_delay = ni->ni_net->net_lnd->lnd_eager_recv == NULL;
1989 ready_delay = msg->msg_rx_ready_delay;
1992 rc = lnet_ptl_match_md(&info, msg);
1997 case LNET_MATCHMD_OK:
1998 lnet_recv_put(ni, msg);
2001 case LNET_MATCHMD_NONE:
2003 /* no eager_recv or has already called it, should
2004 * have been attached on delayed list */
2007 rc = lnet_ni_eager_recv(ni, msg);
2014 case LNET_MATCHMD_DROP:
2015 CNETERR("Dropping PUT from %s portal %d match %llu"
2016 " offset %d length %d: %d\n",
2017 libcfs_id2str(info.mi_id), info.mi_portal,
2018 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
2020 return -ENOENT; /* -ve: OK but no match */
2025 lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get)
2027 struct lnet_match_info info;
2028 lnet_hdr_t *hdr = &msg->msg_hdr;
2029 lnet_process_id_t source_id;
2030 struct lnet_handle_wire reply_wmd;
2033 /* Convert get fields to host byte order */
2034 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
2035 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
2036 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
2037 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
2039 source_id.nid = hdr->src_nid;
2040 source_id.pid = hdr->src_pid;
2041 /* Primary peer NID */
2042 info.mi_id.nid = msg->msg_initiator;
2043 info.mi_id.pid = hdr->src_pid;
2044 info.mi_opc = LNET_MD_OP_GET;
2045 info.mi_portal = hdr->msg.get.ptl_index;
2046 info.mi_rlength = hdr->msg.get.sink_length;
2047 info.mi_roffset = hdr->msg.get.src_offset;
2048 info.mi_mbits = hdr->msg.get.match_bits;
2049 info.mi_cpt = lnet_cpt_of_nid(msg->msg_rxpeer->lpni_nid, ni);
2051 rc = lnet_ptl_match_md(&info, msg);
2052 if (rc == LNET_MATCHMD_DROP) {
2053 CNETERR("Dropping GET from %s portal %d match %llu"
2054 " offset %d length %d\n",
2055 libcfs_id2str(info.mi_id), info.mi_portal,
2056 info.mi_mbits, info.mi_roffset, info.mi_rlength);
2057 return -ENOENT; /* -ve: OK but no match */
2060 LASSERT(rc == LNET_MATCHMD_OK);
2062 lnet_build_msg_event(msg, LNET_EVENT_GET);
2064 reply_wmd = hdr->msg.get.return_wmd;
2066 lnet_prep_send(msg, LNET_MSG_REPLY, source_id,
2067 msg->msg_offset, msg->msg_wanted);
2069 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
2072 /* The LND completes the REPLY from her recv procedure */
2073 lnet_ni_recv(ni, msg->msg_private, msg, 0,
2074 msg->msg_offset, msg->msg_len, msg->msg_len);
2078 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
2079 msg->msg_receiving = 0;
2081 rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
2083 /* didn't get as far as lnet_ni_send() */
2084 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
2085 libcfs_nid2str(ni->ni_nid),
2086 libcfs_id2str(info.mi_id), rc);
2088 lnet_finalize(ni, msg, rc);
2095 lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg)
2097 void *private = msg->msg_private;
2098 lnet_hdr_t *hdr = &msg->msg_hdr;
2099 lnet_process_id_t src = {0};
2105 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
2108 src.nid = hdr->src_nid;
2109 src.pid = hdr->src_pid;
2111 /* NB handles only looked up by creator (no flips) */
2112 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
2113 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2114 CNETERR("%s: Dropping REPLY from %s for %s "
2116 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2117 (md == NULL) ? "invalid" : "inactive",
2118 hdr->msg.reply.dst_wmd.wh_interface_cookie,
2119 hdr->msg.reply.dst_wmd.wh_object_cookie);
2120 if (md != NULL && md->md_me != NULL)
2121 CERROR("REPLY MD also attached to portal %d\n",
2122 md->md_me->me_portal);
2124 lnet_res_unlock(cpt);
2125 return -ENOENT; /* -ve: OK but no match */
2128 LASSERT(md->md_offset == 0);
2130 rlength = hdr->payload_length;
2131 mlength = MIN(rlength, (int)md->md_length);
2133 if (mlength < rlength &&
2134 (md->md_options & LNET_MD_TRUNCATE) == 0) {
2135 CNETERR("%s: Dropping REPLY from %s length %d "
2136 "for MD %#llx would overflow (%d)\n",
2137 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2138 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
2140 lnet_res_unlock(cpt);
2141 return -ENOENT; /* -ve: OK but no match */
2144 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n",
2145 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2146 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
2148 lnet_msg_attach_md(msg, md, 0, mlength);
2151 lnet_setpayloadbuffer(msg);
2153 lnet_res_unlock(cpt);
2155 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2157 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
2162 lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg)
2164 lnet_hdr_t *hdr = &msg->msg_hdr;
2165 lnet_process_id_t src = {0};
2169 src.nid = hdr->src_nid;
2170 src.pid = hdr->src_pid;
2172 /* Convert ack fields to host byte order */
2173 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
2174 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
2176 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
2179 /* NB handles only looked up by creator (no flips) */
2180 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
2181 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2182 /* Don't moan; this is expected */
2184 "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n",
2185 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2186 (md == NULL) ? "invalid" : "inactive",
2187 hdr->msg.ack.dst_wmd.wh_interface_cookie,
2188 hdr->msg.ack.dst_wmd.wh_object_cookie);
2189 if (md != NULL && md->md_me != NULL)
2190 CERROR("Source MD also attached to portal %d\n",
2191 md->md_me->me_portal);
2193 lnet_res_unlock(cpt);
2194 return -ENOENT; /* -ve! */
2197 CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n",
2198 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2199 hdr->msg.ack.dst_wmd.wh_object_cookie);
2201 lnet_msg_attach_md(msg, md, 0, 0);
2203 lnet_res_unlock(cpt);
2205 lnet_build_msg_event(msg, LNET_EVENT_ACK);
2207 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
2212 * \retval LNET_CREDIT_OK If \a msg is forwarded
2213 * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
2214 * \retval -ve error code
2217 lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg)
2221 if (!the_lnet.ln_routing)
2224 if (msg->msg_rxpeer->lpni_rtrcredits <= 0 ||
2225 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
2226 if (ni->ni_net->net_lnd->lnd_eager_recv == NULL) {
2227 msg->msg_rx_ready_delay = 1;
2229 lnet_net_unlock(msg->msg_rx_cpt);
2230 rc = lnet_ni_eager_recv(ni, msg);
2231 lnet_net_lock(msg->msg_rx_cpt);
2236 rc = lnet_post_routed_recv_locked(msg, 0);
2241 lnet_parse_local(lnet_ni_t *ni, lnet_msg_t *msg)
2245 switch (msg->msg_type) {
2247 rc = lnet_parse_ack(ni, msg);
2250 rc = lnet_parse_put(ni, msg);
2253 rc = lnet_parse_get(ni, msg, msg->msg_rdma_get);
2255 case LNET_MSG_REPLY:
2256 rc = lnet_parse_reply(ni, msg);
2258 default: /* prevent an unused label if !kernel */
2263 LASSERT(rc == 0 || rc == -ENOENT);
2268 lnet_msgtyp2str (int type)
2277 case LNET_MSG_REPLY:
2279 case LNET_MSG_HELLO:
2282 return ("<UNKNOWN>");
2287 lnet_print_hdr(lnet_hdr_t * hdr)
2289 lnet_process_id_t src = {0};
2290 lnet_process_id_t dst = {0};
2291 char *type_str = lnet_msgtyp2str(hdr->type);
2293 src.nid = hdr->src_nid;
2294 src.pid = hdr->src_pid;
2296 dst.nid = hdr->dest_nid;
2297 dst.pid = hdr->dest_pid;
2299 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
2300 CWARN(" From %s\n", libcfs_id2str(src));
2301 CWARN(" To %s\n", libcfs_id2str(dst));
2303 switch (hdr->type) {
2308 CWARN(" Ptl index %d, ack md %#llx.%#llx, "
2309 "match bits %llu\n",
2310 hdr->msg.put.ptl_index,
2311 hdr->msg.put.ack_wmd.wh_interface_cookie,
2312 hdr->msg.put.ack_wmd.wh_object_cookie,
2313 hdr->msg.put.match_bits);
2314 CWARN(" Length %d, offset %d, hdr data %#llx\n",
2315 hdr->payload_length, hdr->msg.put.offset,
2316 hdr->msg.put.hdr_data);
2320 CWARN(" Ptl index %d, return md %#llx.%#llx, "
2321 "match bits %llu\n", hdr->msg.get.ptl_index,
2322 hdr->msg.get.return_wmd.wh_interface_cookie,
2323 hdr->msg.get.return_wmd.wh_object_cookie,
2324 hdr->msg.get.match_bits);
2325 CWARN(" Length %d, src offset %d\n",
2326 hdr->msg.get.sink_length,
2327 hdr->msg.get.src_offset);
2331 CWARN(" dst md %#llx.%#llx, "
2332 "manipulated length %d\n",
2333 hdr->msg.ack.dst_wmd.wh_interface_cookie,
2334 hdr->msg.ack.dst_wmd.wh_object_cookie,
2335 hdr->msg.ack.mlength);
2338 case LNET_MSG_REPLY:
2339 CWARN(" dst md %#llx.%#llx, "
2341 hdr->msg.reply.dst_wmd.wh_interface_cookie,
2342 hdr->msg.reply.dst_wmd.wh_object_cookie,
2343 hdr->payload_length);
2349 lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
2350 void *private, int rdma_req)
2355 struct lnet_msg *msg;
2356 lnet_pid_t dest_pid;
2357 lnet_nid_t dest_nid;
2359 struct lnet_peer_ni *lpni;
2360 __u32 payload_length;
2363 LASSERT (!in_interrupt ());
2365 type = le32_to_cpu(hdr->type);
2366 src_nid = le64_to_cpu(hdr->src_nid);
2367 dest_nid = le64_to_cpu(hdr->dest_nid);
2368 dest_pid = le32_to_cpu(hdr->dest_pid);
2369 payload_length = le32_to_cpu(hdr->payload_length);
2371 for_me = (ni->ni_nid == dest_nid);
2372 cpt = lnet_cpt_of_nid(from_nid, ni);
2377 if (payload_length > 0) {
2378 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
2379 libcfs_nid2str(from_nid),
2380 libcfs_nid2str(src_nid),
2381 lnet_msgtyp2str(type), payload_length);
2387 case LNET_MSG_REPLY:
2388 if (payload_length >
2389 (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
2390 CERROR("%s, src %s: bad %s payload %d "
2391 "(%d max expected)\n",
2392 libcfs_nid2str(from_nid),
2393 libcfs_nid2str(src_nid),
2394 lnet_msgtyp2str(type),
2396 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
2402 CERROR("%s, src %s: Bad message type 0x%x\n",
2403 libcfs_nid2str(from_nid),
2404 libcfs_nid2str(src_nid), type);
2408 if (the_lnet.ln_routing &&
2409 ni->ni_last_alive != ktime_get_real_seconds()) {
2410 /* NB: so far here is the only place to set NI status to "up */
2412 ni->ni_last_alive = ktime_get_real_seconds();
2413 if (ni->ni_status != NULL &&
2414 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
2415 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
2419 /* Regard a bad destination NID as a protocol error. Senders should
2420 * know what they're doing; if they don't they're misconfigured, buggy
2421 * or malicious so we chop them off at the knees :) */
2424 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
2425 /* should have gone direct */
2426 CERROR("%s, src %s: Bad dest nid %s "
2427 "(should have been sent direct)\n",
2428 libcfs_nid2str(from_nid),
2429 libcfs_nid2str(src_nid),
2430 libcfs_nid2str(dest_nid));
2434 if (lnet_islocalnid(dest_nid)) {
2435 /* dest is another local NI; sender should have used
2436 * this node's NID on its own network */
2437 CERROR("%s, src %s: Bad dest nid %s "
2438 "(it's my nid but on a different network)\n",
2439 libcfs_nid2str(from_nid),
2440 libcfs_nid2str(src_nid),
2441 libcfs_nid2str(dest_nid));
2445 if (rdma_req && type == LNET_MSG_GET) {
2446 CERROR("%s, src %s: Bad optimized GET for %s "
2447 "(final destination must be me)\n",
2448 libcfs_nid2str(from_nid),
2449 libcfs_nid2str(src_nid),
2450 libcfs_nid2str(dest_nid));
2454 if (!the_lnet.ln_routing) {
2455 CERROR("%s, src %s: Dropping message for %s "
2456 "(routing not enabled)\n",
2457 libcfs_nid2str(from_nid),
2458 libcfs_nid2str(src_nid),
2459 libcfs_nid2str(dest_nid));
2464 /* Message looks OK; we're not going to return an error, so we MUST
2465 * call back lnd_recv() come what may... */
2467 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2468 fail_peer(src_nid, 0)) { /* shall we now? */
2469 CERROR("%s, src %s: Dropping %s to simulate failure\n",
2470 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
2471 lnet_msgtyp2str(type));
2475 if (!list_empty(&the_lnet.ln_drop_rules) &&
2476 lnet_drop_rule_match(hdr)) {
2477 CDEBUG(D_NET, "%s, src %s, dst %s: Dropping %s to simulate"
2478 "silent message loss\n",
2479 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
2480 libcfs_nid2str(dest_nid), lnet_msgtyp2str(type));
2485 msg = lnet_msg_alloc();
2487 CERROR("%s, src %s: Dropping %s (out of memory)\n",
2488 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
2489 lnet_msgtyp2str(type));
2493 /* msg zeroed in lnet_msg_alloc; i.e. flags all clear,
2494 * pointers NULL etc */
2496 msg->msg_type = type;
2497 msg->msg_private = private;
2498 msg->msg_receiving = 1;
2499 msg->msg_rdma_get = rdma_req;
2500 msg->msg_len = msg->msg_wanted = payload_length;
2501 msg->msg_offset = 0;
2502 msg->msg_hdr = *hdr;
2503 /* for building message event */
2504 msg->msg_from = from_nid;
2506 msg->msg_target.pid = dest_pid;
2507 msg->msg_target.nid = dest_nid;
2508 msg->msg_routing = 1;
2511 /* convert common msg->hdr fields to host byteorder */
2512 msg->msg_hdr.type = type;
2513 msg->msg_hdr.src_nid = src_nid;
2514 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
2515 msg->msg_hdr.dest_nid = dest_nid;
2516 msg->msg_hdr.dest_pid = dest_pid;
2517 msg->msg_hdr.payload_length = payload_length;
2519 /* Multi-Rail: Primary NID of source. */
2520 msg->msg_initiator = lnet_peer_primary_nid(src_nid);
2523 lpni = lnet_nid2peerni_locked(from_nid, cpt);
2525 lnet_net_unlock(cpt);
2526 CERROR("%s, src %s: Dropping %s "
2527 "(error %ld looking up sender)\n",
2528 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
2529 lnet_msgtyp2str(type), PTR_ERR(lpni));
2531 if (rc == -ESHUTDOWN)
2532 /* We are shutting down. Don't do anything more */
2536 msg->msg_rxpeer = lpni;
2538 lnet_ni_addref_locked(ni, cpt);
2540 if (lnet_isrouter(msg->msg_rxpeer)) {
2541 lnet_peer_set_alive(msg->msg_rxpeer);
2542 if (avoid_asym_router_failure &&
2543 LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
2544 /* received a remote message from router, update
2545 * remote NI status on this router.
2546 * NB: multi-hop routed message will be ignored.
2548 lnet_router_ni_update_locked(msg->msg_rxpeer,
2549 LNET_NIDNET(src_nid));
2553 lnet_msg_commit(msg, cpt);
2555 /* message delay simulation */
2556 if (unlikely(!list_empty(&the_lnet.ln_delay_rules) &&
2557 lnet_delay_rule_match_locked(hdr, msg))) {
2558 lnet_net_unlock(cpt);
2563 rc = lnet_parse_forward_locked(ni, msg);
2564 lnet_net_unlock(cpt);
2569 if (rc == LNET_CREDIT_OK) {
2570 lnet_ni_recv(ni, msg->msg_private, msg, 0,
2571 0, payload_length, payload_length);
2576 lnet_net_unlock(cpt);
2578 rc = lnet_parse_local(ni, msg);
2584 LASSERT(msg->msg_md == NULL);
2585 lnet_finalize(ni, msg, rc);
2588 lnet_drop_message(ni, cpt, private, payload_length);
2591 EXPORT_SYMBOL(lnet_parse);
2594 lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
2596 while (!list_empty(head)) {
2597 lnet_process_id_t id = {0};
2600 msg = list_entry(head->next, lnet_msg_t, msg_list);
2601 list_del(&msg->msg_list);
2603 id.nid = msg->msg_hdr.src_nid;
2604 id.pid = msg->msg_hdr.src_pid;
2606 LASSERT(msg->msg_md == NULL);
2607 LASSERT(msg->msg_rx_delayed);
2608 LASSERT(msg->msg_rxpeer != NULL);
2609 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2611 CWARN("Dropping delayed PUT from %s portal %d match %llu"
2612 " offset %d length %d: %s\n",
2614 msg->msg_hdr.msg.put.ptl_index,
2615 msg->msg_hdr.msg.put.match_bits,
2616 msg->msg_hdr.msg.put.offset,
2617 msg->msg_hdr.payload_length, reason);
2619 /* NB I can't drop msg's ref on msg_rxpeer until after I've
2620 * called lnet_drop_message(), so I just hang onto msg as well
2621 * until that's done */
2623 lnet_drop_message(msg->msg_rxni, msg->msg_rx_cpt,
2624 msg->msg_private, msg->msg_len);
2626 * NB: message will not generate event because w/o attached MD,
2627 * but we still should give error code so lnet_msg_decommit()
2628 * can skip counters operations and other checks.
2630 lnet_finalize(msg->msg_rxni, msg, -ENOENT);
2635 lnet_recv_delayed_msg_list(struct list_head *head)
2637 while (!list_empty(head)) {
2639 lnet_process_id_t id;
2641 msg = list_entry(head->next, lnet_msg_t, msg_list);
2642 list_del(&msg->msg_list);
2644 /* md won't disappear under me, since each msg
2645 * holds a ref on it */
2647 id.nid = msg->msg_hdr.src_nid;
2648 id.pid = msg->msg_hdr.src_pid;
2650 LASSERT(msg->msg_rx_delayed);
2651 LASSERT(msg->msg_md != NULL);
2652 LASSERT(msg->msg_rxpeer != NULL);
2653 LASSERT(msg->msg_rxni != NULL);
2654 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2656 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
2657 "match %llu offset %d length %d.\n",
2658 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
2659 msg->msg_hdr.msg.put.match_bits,
2660 msg->msg_hdr.msg.put.offset,
2661 msg->msg_hdr.payload_length);
2663 lnet_recv_put(msg->msg_rxni, msg);
2668 * Initiate an asynchronous PUT operation.
2670 * There are several events associated with a PUT: completion of the send on
2671 * the initiator node (LNET_EVENT_SEND), and when the send completes
2672 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
2673 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
2674 * used at the target node to indicate the completion of incoming data
2677 * The local events will be logged in the EQ associated with the MD pointed to
2678 * by \a mdh handle. Using a MD without an associated EQ results in these
2679 * events being discarded. In this case, the caller must have another
2680 * mechanism (e.g., a higher level protocol) for determining when it is safe
2681 * to modify the memory region associated with the MD.
2683 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
2684 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
2686 * \param self Indicates the NID of a local interface through which to send
2687 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
2688 * \param mdh A handle for the MD that describes the memory to be sent. The MD
2689 * must be "free floating" (See LNetMDBind()).
2690 * \param ack Controls whether an acknowledgment is requested.
2691 * Acknowledgments are only sent when they are requested by the initiating
2692 * process and the target MD enables them.
2693 * \param target A process identifier for the target process.
2694 * \param portal The index in the \a target's portal table.
2695 * \param match_bits The match bits to use for MD selection at the target
2697 * \param offset The offset into the target MD (only used when the target
2698 * MD has the LNET_MD_MANAGE_REMOTE option set).
2699 * \param hdr_data 64 bits of user data that can be included in the message
2700 * header. This data is written to an event queue entry at the target if an
2701 * EQ is present on the matching MD.
2703 * \retval 0 Success, and only in this case events will be generated
2704 * and logged to EQ (if it exists).
2705 * \retval -EIO Simulated failure.
2706 * \retval -ENOMEM Memory allocation failure.
2707 * \retval -ENOENT Invalid MD object.
2709 * \see lnet_event_t::hdr_data and lnet_event_kind_t.
2712 LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack,
2713 lnet_process_id_t target, unsigned int portal,
2714 __u64 match_bits, unsigned int offset,
2717 struct lnet_msg *msg;
2718 struct lnet_libmd *md;
2722 LASSERT(the_lnet.ln_refcount > 0);
2724 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2725 fail_peer(target.nid, 1)) { /* shall we now? */
2726 CERROR("Dropping PUT to %s: simulated failure\n",
2727 libcfs_id2str(target));
2731 msg = lnet_msg_alloc();
2733 CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n",
2734 libcfs_id2str(target));
2737 msg->msg_vmflush = !!memory_pressure_get();
2739 cpt = lnet_cpt_of_cookie(mdh.cookie);
2742 md = lnet_handle2md(&mdh);
2743 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2744 CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n",
2745 match_bits, portal, libcfs_id2str(target),
2746 md == NULL ? -1 : md->md_threshold);
2747 if (md != NULL && md->md_me != NULL)
2748 CERROR("Source MD also attached to portal %d\n",
2749 md->md_me->me_portal);
2750 lnet_res_unlock(cpt);
2756 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
2758 lnet_msg_attach_md(msg, md, 0, 0);
2760 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
2762 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
2763 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
2764 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
2765 msg->msg_hdr.msg.put.hdr_data = hdr_data;
2767 /* NB handles only looked up by creator (no flips) */
2768 if (ack == LNET_ACK_REQ) {
2769 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2770 the_lnet.ln_interface_cookie;
2771 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2772 md->md_lh.lh_cookie;
2774 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2775 LNET_WIRE_HANDLE_COOKIE_NONE;
2776 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2777 LNET_WIRE_HANDLE_COOKIE_NONE;
2780 lnet_res_unlock(cpt);
2782 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2784 rc = lnet_send(self, msg, LNET_NID_ANY);
2786 CNETERR("Error sending PUT to %s: %d\n",
2787 libcfs_id2str(target), rc);
2788 lnet_finalize(NULL, msg, rc);
2791 /* completion will be signalled by an event */
2794 EXPORT_SYMBOL(LNetPut);
2797 lnet_create_reply_msg (lnet_ni_t *ni, lnet_msg_t *getmsg)
2799 /* The LND can DMA direct to the GET md (i.e. no REPLY msg). This
2800 * returns a msg for the LND to pass to lnet_finalize() when the sink
2801 * data has been received.
2803 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
2804 * lnet_finalize() is called on it, so the LND must call this first */
2806 struct lnet_msg *msg = lnet_msg_alloc();
2807 struct lnet_libmd *getmd = getmsg->msg_md;
2808 lnet_process_id_t peer_id = getmsg->msg_target;
2811 LASSERT(!getmsg->msg_target_is_router);
2812 LASSERT(!getmsg->msg_routing);
2815 CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
2816 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
2820 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
2823 LASSERT(getmd->md_refcount > 0);
2825 if (getmd->md_threshold == 0) {
2826 CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
2827 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
2829 lnet_res_unlock(cpt);
2833 LASSERT(getmd->md_offset == 0);
2835 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
2836 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
2838 /* setup information for lnet_build_msg_event */
2839 msg->msg_initiator = lnet_peer_primary_nid(peer_id.nid);
2840 /* Cheaper: msg->msg_initiator = getmsg->msg_txpeer->lp_nid; */
2841 msg->msg_from = peer_id.nid;
2842 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
2843 msg->msg_hdr.src_nid = peer_id.nid;
2844 msg->msg_hdr.payload_length = getmd->md_length;
2845 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
2847 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
2848 lnet_res_unlock(cpt);
2850 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
2853 lnet_msg_commit(msg, cpt);
2854 lnet_net_unlock(cpt);
2856 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2861 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
2864 the_lnet.ln_counters[cpt]->drop_count++;
2865 the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
2866 lnet_net_unlock(cpt);
2873 EXPORT_SYMBOL(lnet_create_reply_msg);
2876 lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len)
2878 /* Set the REPLY length, now the RDMA that elides the REPLY message has
2879 * completed and I know it. */
2880 LASSERT(reply != NULL);
2881 LASSERT(reply->msg_type == LNET_MSG_GET);
2882 LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
2884 /* NB I trusted my peer to RDMA. If she tells me she's written beyond
2885 * the end of my buffer, I might as well be dead. */
2886 LASSERT(len <= reply->msg_ev.mlength);
2888 reply->msg_ev.mlength = len;
2890 EXPORT_SYMBOL(lnet_set_reply_msg_len);
2893 * Initiate an asynchronous GET operation.
2895 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
2896 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
2897 * the target node in the REPLY has been written to local MD.
2899 * On the target node, an LNET_EVENT_GET is logged when the GET request
2900 * arrives and is accepted into a MD.
2902 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
2903 * \param mdh A handle for the MD that describes the memory into which the
2904 * requested data will be received. The MD must be "free floating" (See LNetMDBind()).
2906 * \retval 0 Success, and only in this case events will be generated
2907 * and logged to EQ (if it exists) of the MD.
2908 * \retval -EIO Simulated failure.
2909 * \retval -ENOMEM Memory allocation failure.
2910 * \retval -ENOENT Invalid MD object.
2913 LNetGet(lnet_nid_t self, lnet_handle_md_t mdh,
2914 lnet_process_id_t target, unsigned int portal,
2915 __u64 match_bits, unsigned int offset)
2917 struct lnet_msg *msg;
2918 struct lnet_libmd *md;
2922 LASSERT(the_lnet.ln_refcount > 0);
2924 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
2925 fail_peer(target.nid, 1)) /* shall we now? */
2927 CERROR("Dropping GET to %s: simulated failure\n",
2928 libcfs_id2str(target));
2932 msg = lnet_msg_alloc();
2934 CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n",
2935 libcfs_id2str(target));
2939 cpt = lnet_cpt_of_cookie(mdh.cookie);
2942 md = lnet_handle2md(&mdh);
2943 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2944 CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n",
2945 match_bits, portal, libcfs_id2str(target),
2946 md == NULL ? -1 : md->md_threshold);
2947 if (md != NULL && md->md_me != NULL)
2948 CERROR("REPLY MD also attached to portal %d\n",
2949 md->md_me->me_portal);
2951 lnet_res_unlock(cpt);
2957 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
2959 lnet_msg_attach_md(msg, md, 0, 0);
2961 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
2963 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
2964 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
2965 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
2966 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
2968 /* NB handles only looked up by creator (no flips) */
2969 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
2970 the_lnet.ln_interface_cookie;
2971 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
2972 md->md_lh.lh_cookie;
2974 lnet_res_unlock(cpt);
2976 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2978 rc = lnet_send(self, msg, LNET_NID_ANY);
2980 CNETERR("Error sending GET to %s: %d\n",
2981 libcfs_id2str(target), rc);
2982 lnet_finalize(NULL, msg, rc);
2985 /* completion will be signalled by an event */
2988 EXPORT_SYMBOL(LNetGet);
2991 * Calculate distance to node at \a dstnid.
2993 * \param dstnid Target NID.
2994 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
2996 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
2999 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
3000 * local_nid_dist_zero is set, which is the default.
3001 * \retval positives Distance to target NID, i.e. number of hops plus one.
3002 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
3005 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
3007 struct list_head *e;
3008 struct lnet_ni *ni = NULL;
3009 lnet_remotenet_t *rnet;
3010 __u32 dstnet = LNET_NIDNET(dstnid);
3014 struct list_head *rn_list;
3016 /* if !local_nid_dist_zero, I don't return a distance of 0 ever
3017 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
3018 * keep order 0 free for 0@lo and order 1 free for a local NID
3021 LASSERT(the_lnet.ln_refcount > 0);
3023 cpt = lnet_net_lock_current();
3025 while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
3026 if (ni->ni_nid == dstnid) {
3027 if (srcnidp != NULL)
3029 if (orderp != NULL) {
3030 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
3035 lnet_net_unlock(cpt);
3037 return local_nid_dist_zero ? 0 : 1;
3040 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
3041 /* Check if ni was originally created in
3042 * current net namespace.
3043 * If not, assign order above 0xffff0000,
3044 * to make this ni not a priority. */
3045 if (!net_eq(ni->ni_net_ns, current->nsproxy->net_ns))
3046 order += 0xffff0000;
3048 if (srcnidp != NULL)
3049 *srcnidp = ni->ni_nid;
3052 lnet_net_unlock(cpt);
3059 rn_list = lnet_net2rnethash(dstnet);
3060 list_for_each(e, rn_list) {
3061 rnet = list_entry(e, lnet_remotenet_t, lrn_list);
3063 if (rnet->lrn_net == dstnet) {
3064 lnet_route_t *route;
3065 lnet_route_t *shortest = NULL;
3066 __u32 shortest_hops = LNET_UNDEFINED_HOPS;
3069 LASSERT(!list_empty(&rnet->lrn_routes));
3071 list_for_each_entry(route, &rnet->lrn_routes,
3073 route_hops = route->lr_hops;
3074 if (route_hops == LNET_UNDEFINED_HOPS)
3076 if (shortest == NULL ||
3077 route_hops < shortest_hops) {
3079 shortest_hops = route_hops;
3083 LASSERT(shortest != NULL);
3084 hops = shortest_hops;
3085 if (srcnidp != NULL) {
3086 ni = lnet_get_next_ni_locked(
3087 shortest->lr_gateway->lpni_net,
3089 *srcnidp = ni->ni_nid;
3093 lnet_net_unlock(cpt);
3099 lnet_net_unlock(cpt);
3100 return -EHOSTUNREACH;
3102 EXPORT_SYMBOL(LNetDist);