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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lnet/lnet/lib-move.c
38 * Data movement routines
41 #define DEBUG_SUBSYSTEM S_LNET
43 #include <lnet/lib-lnet.h>
45 static int local_nid_dist_zero = 1;
46 CFS_MODULE_PARM(local_nid_dist_zero, "i", int, 0444,
50 lnet_fail_nid (lnet_nid_t nid, unsigned int threshold)
57 LASSERT (the_lnet.ln_init);
59 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
61 /* Adding a new entry */
62 LIBCFS_ALLOC(tp, sizeof(*tp));
67 tp->tp_threshold = threshold;
70 cfs_list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
75 /* removing entries */
76 CFS_INIT_LIST_HEAD(&cull);
80 cfs_list_for_each_safe (el, next, &the_lnet.ln_test_peers) {
81 tp = cfs_list_entry (el, lnet_test_peer_t, tp_list);
83 if (tp->tp_threshold == 0 || /* needs culling anyway */
84 nid == LNET_NID_ANY || /* removing all entries */
85 tp->tp_nid == nid) /* matched this one */
87 cfs_list_del (&tp->tp_list);
88 cfs_list_add (&tp->tp_list, &cull);
94 while (!cfs_list_empty (&cull)) {
95 tp = cfs_list_entry (cull.next, lnet_test_peer_t, tp_list);
97 cfs_list_del (&tp->tp_list);
98 LIBCFS_FREE(tp, sizeof (*tp));
104 fail_peer (lnet_nid_t nid, int outgoing)
106 lnet_test_peer_t *tp;
112 CFS_INIT_LIST_HEAD (&cull);
114 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
117 cfs_list_for_each_safe (el, next, &the_lnet.ln_test_peers) {
118 tp = cfs_list_entry (el, lnet_test_peer_t, tp_list);
120 if (tp->tp_threshold == 0) {
123 /* only cull zombies on outgoing tests,
124 * since we may be at interrupt priority on
125 * incoming messages. */
126 cfs_list_del (&tp->tp_list);
127 cfs_list_add (&tp->tp_list, &cull);
132 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
133 nid == tp->tp_nid) { /* fail this peer */
136 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
139 tp->tp_threshold == 0) {
141 cfs_list_del (&tp->tp_list);
142 cfs_list_add (&tp->tp_list, &cull);
151 while (!cfs_list_empty (&cull)) {
152 tp = cfs_list_entry (cull.next, lnet_test_peer_t, tp_list);
153 cfs_list_del (&tp->tp_list);
155 LIBCFS_FREE(tp, sizeof (*tp));
162 lnet_iov_nob (unsigned int niov, struct iovec *iov)
164 unsigned int nob = 0;
167 nob += (iov++)->iov_len;
171 EXPORT_SYMBOL(lnet_iov_nob);
174 lnet_copy_iov2iov (unsigned int ndiov, struct iovec *diov, unsigned int doffset,
175 unsigned int nsiov, struct iovec *siov, unsigned int soffset,
178 /* NB diov, siov are READ-ONLY */
179 unsigned int this_nob;
184 /* skip complete frags before 'doffset' */
186 while (doffset >= diov->iov_len) {
187 doffset -= diov->iov_len;
193 /* skip complete frags before 'soffset' */
195 while (soffset >= siov->iov_len) {
196 soffset -= siov->iov_len;
205 this_nob = MIN(diov->iov_len - doffset,
206 siov->iov_len - soffset);
207 this_nob = MIN(this_nob, nob);
209 memcpy ((char *)diov->iov_base + doffset,
210 (char *)siov->iov_base + soffset, this_nob);
213 if (diov->iov_len > doffset + this_nob) {
221 if (siov->iov_len > soffset + this_nob) {
230 EXPORT_SYMBOL(lnet_copy_iov2iov);
233 lnet_extract_iov (int dst_niov, struct iovec *dst,
234 int src_niov, struct iovec *src,
235 unsigned int offset, unsigned int len)
237 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
238 * for exactly 'len' bytes, and return the number of entries.
239 * NB not destructive to 'src' */
240 unsigned int frag_len;
243 if (len == 0) /* no data => */
244 return (0); /* no frags */
246 LASSERT (src_niov > 0);
247 while (offset >= src->iov_len) { /* skip initial frags */
248 offset -= src->iov_len;
251 LASSERT (src_niov > 0);
256 LASSERT (src_niov > 0);
257 LASSERT ((int)niov <= dst_niov);
259 frag_len = src->iov_len - offset;
260 dst->iov_base = ((char *)src->iov_base) + offset;
262 if (len <= frag_len) {
267 dst->iov_len = frag_len;
277 EXPORT_SYMBOL(lnet_extract_iov);
281 lnet_kiov_nob (unsigned int niov, lnet_kiov_t *kiov)
288 lnet_copy_kiov2kiov (unsigned int ndkiov, lnet_kiov_t *dkiov, unsigned int doffset,
289 unsigned int nskiov, lnet_kiov_t *skiov, unsigned int soffset,
296 lnet_copy_kiov2iov (unsigned int niov, struct iovec *iov, unsigned int iovoffset,
297 unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
304 lnet_copy_iov2kiov (unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
305 unsigned int niov, struct iovec *iov, unsigned int iovoffset,
312 lnet_extract_kiov (int dst_niov, lnet_kiov_t *dst,
313 int src_niov, lnet_kiov_t *src,
314 unsigned int offset, unsigned int len)
319 #else /* __KERNEL__ */
322 lnet_kiov_nob (unsigned int niov, lnet_kiov_t *kiov)
324 unsigned int nob = 0;
327 nob += (kiov++)->kiov_len;
331 EXPORT_SYMBOL(lnet_kiov_nob);
334 lnet_copy_kiov2kiov (unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
335 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
338 /* NB diov, siov are READ-ONLY */
339 unsigned int this_nob;
346 LASSERT (!cfs_in_interrupt ());
349 while (doffset >= diov->kiov_len) {
350 doffset -= diov->kiov_len;
357 while (soffset >= siov->kiov_len) {
358 soffset -= siov->kiov_len;
367 this_nob = MIN(diov->kiov_len - doffset,
368 siov->kiov_len - soffset);
369 this_nob = MIN(this_nob, nob);
372 daddr = ((char *)kmap(diov->kiov_page)) +
373 diov->kiov_offset + doffset;
375 saddr = ((char *)kmap(siov->kiov_page)) +
376 siov->kiov_offset + soffset;
378 /* Vanishing risk of kmap deadlock when mapping 2 pages.
379 * However in practice at least one of the kiovs will be mapped
380 * kernel pages and the map/unmap will be NOOPs */
382 memcpy (daddr, saddr, this_nob);
385 if (diov->kiov_len > doffset + this_nob) {
389 kunmap(diov->kiov_page);
396 if (siov->kiov_len > soffset + this_nob) {
400 kunmap(siov->kiov_page);
409 kunmap(diov->kiov_page);
411 kunmap(siov->kiov_page);
413 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
416 lnet_copy_kiov2iov (unsigned int niov, struct iovec *iov, unsigned int iovoffset,
417 unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
420 /* NB iov, kiov are READ-ONLY */
421 unsigned int this_nob;
427 LASSERT (!cfs_in_interrupt ());
430 while (iovoffset >= iov->iov_len) {
431 iovoffset -= iov->iov_len;
438 while (kiovoffset >= kiov->kiov_len) {
439 kiovoffset -= kiov->kiov_len;
448 this_nob = MIN(iov->iov_len - iovoffset,
449 kiov->kiov_len - kiovoffset);
450 this_nob = MIN(this_nob, nob);
453 addr = ((char *)kmap(kiov->kiov_page)) +
454 kiov->kiov_offset + kiovoffset;
456 memcpy ((char *)iov->iov_base + iovoffset, addr, this_nob);
459 if (iov->iov_len > iovoffset + this_nob) {
460 iovoffset += this_nob;
467 if (kiov->kiov_len > kiovoffset + this_nob) {
469 kiovoffset += this_nob;
471 kunmap(kiov->kiov_page);
481 kunmap(kiov->kiov_page);
483 EXPORT_SYMBOL(lnet_copy_kiov2iov);
486 lnet_copy_iov2kiov (unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
487 unsigned int niov, struct iovec *iov, unsigned int iovoffset,
490 /* NB kiov, iov are READ-ONLY */
491 unsigned int this_nob;
497 LASSERT (!cfs_in_interrupt ());
500 while (kiovoffset >= kiov->kiov_len) {
501 kiovoffset -= kiov->kiov_len;
508 while (iovoffset >= iov->iov_len) {
509 iovoffset -= iov->iov_len;
518 this_nob = MIN(kiov->kiov_len - kiovoffset,
519 iov->iov_len - iovoffset);
520 this_nob = MIN(this_nob, nob);
523 addr = ((char *)kmap(kiov->kiov_page)) +
524 kiov->kiov_offset + kiovoffset;
526 memcpy (addr, (char *)iov->iov_base + iovoffset, this_nob);
529 if (kiov->kiov_len > kiovoffset + this_nob) {
531 kiovoffset += this_nob;
533 kunmap(kiov->kiov_page);
540 if (iov->iov_len > iovoffset + this_nob) {
541 iovoffset += this_nob;
550 kunmap(kiov->kiov_page);
552 EXPORT_SYMBOL(lnet_copy_iov2kiov);
555 lnet_extract_kiov (int dst_niov, lnet_kiov_t *dst,
556 int src_niov, lnet_kiov_t *src,
557 unsigned int offset, unsigned int len)
559 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
560 * for exactly 'len' bytes, and return the number of entries.
561 * NB not destructive to 'src' */
562 unsigned int frag_len;
565 if (len == 0) /* no data => */
566 return (0); /* no frags */
568 LASSERT (src_niov > 0);
569 while (offset >= src->kiov_len) { /* skip initial frags */
570 offset -= src->kiov_len;
573 LASSERT (src_niov > 0);
578 LASSERT (src_niov > 0);
579 LASSERT ((int)niov <= dst_niov);
581 frag_len = src->kiov_len - offset;
582 dst->kiov_page = src->kiov_page;
583 dst->kiov_offset = src->kiov_offset + offset;
585 if (len <= frag_len) {
587 LASSERT (dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE);
591 dst->kiov_len = frag_len;
592 LASSERT (dst->kiov_offset + dst->kiov_len <= PAGE_CACHE_SIZE);
602 EXPORT_SYMBOL(lnet_extract_kiov);
606 lnet_ni_recv(lnet_ni_t *ni, void *private, lnet_msg_t *msg, int delayed,
607 unsigned int offset, unsigned int mlen, unsigned int rlen)
609 unsigned int niov = 0;
610 struct iovec *iov = NULL;
611 lnet_kiov_t *kiov = NULL;
614 LASSERT (!cfs_in_interrupt ());
615 LASSERT (mlen == 0 || msg != NULL);
618 LASSERT(msg->msg_receiving);
619 LASSERT(!msg->msg_sending);
620 LASSERT(rlen == msg->msg_len);
621 LASSERT(mlen <= msg->msg_len);
622 LASSERT(msg->msg_offset == offset);
623 LASSERT(msg->msg_wanted == mlen);
625 msg->msg_receiving = 0;
628 niov = msg->msg_niov;
630 kiov = msg->msg_kiov;
633 LASSERT ((iov == NULL) != (kiov == NULL));
637 rc = (ni->ni_lnd->lnd_recv)(ni, private, msg, delayed,
638 niov, iov, kiov, offset, mlen, rlen);
640 lnet_finalize(ni, msg, rc);
644 lnet_setpayloadbuffer(lnet_msg_t *msg)
646 lnet_libmd_t *md = msg->msg_md;
648 LASSERT (msg->msg_len > 0);
649 LASSERT (!msg->msg_routing);
650 LASSERT (md != NULL);
651 LASSERT (msg->msg_niov == 0);
652 LASSERT (msg->msg_iov == NULL);
653 LASSERT (msg->msg_kiov == NULL);
655 msg->msg_niov = md->md_niov;
656 if ((md->md_options & LNET_MD_KIOV) != 0)
657 msg->msg_kiov = md->md_iov.kiov;
659 msg->msg_iov = md->md_iov.iov;
663 lnet_prep_send(lnet_msg_t *msg, int type, lnet_process_id_t target,
664 unsigned int offset, unsigned int len)
666 msg->msg_type = type;
667 msg->msg_target = target;
669 msg->msg_offset = offset;
672 lnet_setpayloadbuffer(msg);
674 memset (&msg->msg_hdr, 0, sizeof (msg->msg_hdr));
675 msg->msg_hdr.type = cpu_to_le32(type);
676 msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
677 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
678 /* src_nid will be set later */
679 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
680 msg->msg_hdr.payload_length = cpu_to_le32(len);
684 lnet_ni_send(lnet_ni_t *ni, lnet_msg_t *msg)
686 void *priv = msg->msg_private;
689 LASSERT (!cfs_in_interrupt ());
690 LASSERT (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
691 (msg->msg_txcredit && msg->msg_peertxcredit));
693 rc = (ni->ni_lnd->lnd_send)(ni, priv, msg);
695 lnet_finalize(ni, msg, rc);
699 lnet_ni_eager_recv(lnet_ni_t *ni, lnet_msg_t *msg)
703 LASSERT(!msg->msg_sending);
704 LASSERT(msg->msg_receiving);
705 LASSERT(!msg->msg_rx_ready_delay);
706 LASSERT(ni->ni_lnd->lnd_eager_recv != NULL);
708 msg->msg_rx_ready_delay = 1;
709 rc = (ni->ni_lnd->lnd_eager_recv)(ni, msg->msg_private, msg,
712 CERROR("recv from %s / send to %s aborted: "
713 "eager_recv failed %d\n",
714 libcfs_nid2str(msg->msg_rxpeer->lp_nid),
715 libcfs_id2str(msg->msg_target), rc);
716 LASSERT(rc < 0); /* required by my callers */
722 /* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */
724 lnet_ni_query_locked(lnet_ni_t *ni, lnet_peer_t *lp)
726 cfs_time_t last_alive = 0;
728 LASSERT(lnet_peer_aliveness_enabled(lp));
729 LASSERT(ni->ni_lnd->lnd_query != NULL);
731 lnet_net_unlock(lp->lp_cpt);
732 (ni->ni_lnd->lnd_query)(ni, lp->lp_nid, &last_alive);
733 lnet_net_lock(lp->lp_cpt);
735 lp->lp_last_query = cfs_time_current();
737 if (last_alive != 0) /* NI has updated timestamp */
738 lp->lp_last_alive = last_alive;
741 /* NB: always called with lnet_net_lock held */
743 lnet_peer_is_alive (lnet_peer_t *lp, cfs_time_t now)
748 LASSERT (lnet_peer_aliveness_enabled(lp));
750 /* Trust lnet_notify() if it has more recent aliveness news, but
751 * ignore the initial assumed death (see lnet_peers_start_down()).
753 if (!lp->lp_alive && lp->lp_alive_count > 0 &&
754 cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive))
757 deadline = cfs_time_add(lp->lp_last_alive,
758 cfs_time_seconds(lp->lp_ni->ni_peertimeout));
759 alive = cfs_time_after(deadline, now);
761 /* Update obsolete lp_alive except for routers assumed to be dead
762 * initially, because router checker would update aliveness in this
763 * case, and moreover lp_last_alive at peer creation is assumed.
765 if (alive && !lp->lp_alive &&
766 !(lnet_isrouter(lp) && lp->lp_alive_count == 0))
767 lnet_notify_locked(lp, 0, 1, lp->lp_last_alive);
773 /* NB: returns 1 when alive, 0 when dead, negative when error;
774 * may drop the lnet_net_lock */
776 lnet_peer_alive_locked (lnet_peer_t *lp)
778 cfs_time_t now = cfs_time_current();
780 if (!lnet_peer_aliveness_enabled(lp))
783 if (lnet_peer_is_alive(lp, now))
786 /* Peer appears dead, but we should avoid frequent NI queries (at
787 * most once per lnet_queryinterval seconds). */
788 if (lp->lp_last_query != 0) {
789 static const int lnet_queryinterval = 1;
791 cfs_time_t next_query =
792 cfs_time_add(lp->lp_last_query,
793 cfs_time_seconds(lnet_queryinterval));
795 if (cfs_time_before(now, next_query)) {
797 CWARN("Unexpected aliveness of peer %s: "
799 libcfs_nid2str(lp->lp_nid),
800 (int)now, (int)next_query,
802 lp->lp_ni->ni_peertimeout);
807 /* query NI for latest aliveness news */
808 lnet_ni_query_locked(lp->lp_ni, lp);
810 if (lnet_peer_is_alive(lp, now))
813 lnet_notify_locked(lp, 0, 0, lp->lp_last_alive);
818 lnet_post_send_locked(lnet_msg_t *msg, int do_send)
820 /* lnet_send is going to lnet_net_unlock immediately after this,
821 * so it sets do_send FALSE and I don't do the unlock/send/lock bit.
822 * I return EAGAIN if msg blocked, EHOSTUNREACH if msg_txpeer
823 * appears dead, and 0 if sent or OK to send */
824 struct lnet_peer *lp = msg->msg_txpeer;
825 struct lnet_ni *ni = lp->lp_ni;
826 struct lnet_tx_queue *tq;
829 /* non-lnet_send() callers have checked before */
830 LASSERT(!do_send || msg->msg_tx_delayed);
831 LASSERT(!msg->msg_receiving);
832 LASSERT(msg->msg_tx_committed);
834 cpt = msg->msg_tx_cpt;
835 tq = ni->ni_tx_queues[cpt];
837 /* NB 'lp' is always the next hop */
838 if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
839 lnet_peer_alive_locked(lp) == 0) {
840 the_lnet.ln_counters[cpt]->drop_count++;
841 the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
842 lnet_net_unlock(cpt);
844 CNETERR("Dropping message for %s: peer not alive\n",
845 libcfs_id2str(msg->msg_target));
847 lnet_finalize(ni, msg, -EHOSTUNREACH);
853 if (!msg->msg_peertxcredit) {
854 LASSERT ((lp->lp_txcredits < 0) ==
855 !cfs_list_empty(&lp->lp_txq));
857 msg->msg_peertxcredit = 1;
858 lp->lp_txqnob += msg->msg_len + sizeof(lnet_hdr_t);
861 if (lp->lp_txcredits < lp->lp_mintxcredits)
862 lp->lp_mintxcredits = lp->lp_txcredits;
864 if (lp->lp_txcredits < 0) {
865 msg->msg_tx_delayed = 1;
866 cfs_list_add_tail(&msg->msg_list, &lp->lp_txq);
871 if (!msg->msg_txcredit) {
872 LASSERT((tq->tq_credits < 0) ==
873 !cfs_list_empty(&tq->tq_delayed));
875 msg->msg_txcredit = 1;
878 if (tq->tq_credits < tq->tq_credits_min)
879 tq->tq_credits_min = tq->tq_credits;
881 if (tq->tq_credits < 0) {
882 msg->msg_tx_delayed = 1;
883 cfs_list_add_tail(&msg->msg_list, &tq->tq_delayed);
889 lnet_net_unlock(cpt);
890 lnet_ni_send(ni, msg);
899 lnet_msg2bufpool(lnet_msg_t *msg)
901 lnet_rtrbufpool_t *rbp;
904 LASSERT(msg->msg_rx_committed);
906 cpt = msg->msg_rx_cpt;
907 rbp = &the_lnet.ln_rtrpools[cpt][0];
909 LASSERT(msg->msg_len <= LNET_MTU);
910 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_CACHE_SIZE) {
912 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
919 lnet_post_routed_recv_locked (lnet_msg_t *msg, int do_recv)
921 /* lnet_parse is going to lnet_net_unlock immediately after this, so it
922 * sets do_recv FALSE and I don't do the unlock/send/lock bit. I
923 * return EAGAIN if msg blocked and 0 if received or OK to receive */
924 lnet_peer_t *lp = msg->msg_rxpeer;
925 lnet_rtrbufpool_t *rbp;
928 LASSERT (msg->msg_iov == NULL);
929 LASSERT (msg->msg_kiov == NULL);
930 LASSERT (msg->msg_niov == 0);
931 LASSERT (msg->msg_routing);
932 LASSERT (msg->msg_receiving);
933 LASSERT (!msg->msg_sending);
935 /* non-lnet_parse callers only receive delayed messages */
936 LASSERT(!do_recv || msg->msg_rx_delayed);
938 if (!msg->msg_peerrtrcredit) {
939 LASSERT ((lp->lp_rtrcredits < 0) ==
940 !cfs_list_empty(&lp->lp_rtrq));
942 msg->msg_peerrtrcredit = 1;
944 if (lp->lp_rtrcredits < lp->lp_minrtrcredits)
945 lp->lp_minrtrcredits = lp->lp_rtrcredits;
947 if (lp->lp_rtrcredits < 0) {
948 /* must have checked eager_recv before here */
949 LASSERT(msg->msg_rx_ready_delay);
950 msg->msg_rx_delayed = 1;
951 cfs_list_add_tail(&msg->msg_list, &lp->lp_rtrq);
956 rbp = lnet_msg2bufpool(msg);
958 if (!msg->msg_rtrcredit) {
959 LASSERT ((rbp->rbp_credits < 0) ==
960 !cfs_list_empty(&rbp->rbp_msgs));
962 msg->msg_rtrcredit = 1;
964 if (rbp->rbp_credits < rbp->rbp_mincredits)
965 rbp->rbp_mincredits = rbp->rbp_credits;
967 if (rbp->rbp_credits < 0) {
968 /* must have checked eager_recv before here */
969 LASSERT(msg->msg_rx_ready_delay);
970 msg->msg_rx_delayed = 1;
971 cfs_list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
976 LASSERT (!cfs_list_empty(&rbp->rbp_bufs));
977 rb = cfs_list_entry(rbp->rbp_bufs.next, lnet_rtrbuf_t, rb_list);
978 cfs_list_del(&rb->rb_list);
980 msg->msg_niov = rbp->rbp_npages;
981 msg->msg_kiov = &rb->rb_kiov[0];
984 int cpt = msg->msg_rx_cpt;
986 lnet_net_unlock(cpt);
987 lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1,
988 0, msg->msg_len, msg->msg_len);
996 lnet_return_tx_credits_locked(lnet_msg_t *msg)
998 lnet_peer_t *txpeer = msg->msg_txpeer;
1001 if (msg->msg_txcredit) {
1002 struct lnet_ni *ni = txpeer->lp_ni;
1003 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
1005 /* give back NI txcredits */
1006 msg->msg_txcredit = 0;
1008 LASSERT((tq->tq_credits < 0) ==
1009 !cfs_list_empty(&tq->tq_delayed));
1012 if (tq->tq_credits <= 0) {
1013 msg2 = cfs_list_entry(tq->tq_delayed.next,
1014 lnet_msg_t, msg_list);
1015 cfs_list_del(&msg2->msg_list);
1017 LASSERT(msg2->msg_txpeer->lp_ni == ni);
1018 LASSERT(msg2->msg_tx_delayed);
1020 (void) lnet_post_send_locked(msg2, 1);
1024 if (msg->msg_peertxcredit) {
1025 /* give back peer txcredits */
1026 msg->msg_peertxcredit = 0;
1028 LASSERT((txpeer->lp_txcredits < 0) ==
1029 !cfs_list_empty(&txpeer->lp_txq));
1031 txpeer->lp_txqnob -= msg->msg_len + sizeof(lnet_hdr_t);
1032 LASSERT (txpeer->lp_txqnob >= 0);
1034 txpeer->lp_txcredits++;
1035 if (txpeer->lp_txcredits <= 0) {
1036 msg2 = cfs_list_entry(txpeer->lp_txq.next,
1037 lnet_msg_t, msg_list);
1038 cfs_list_del(&msg2->msg_list);
1040 LASSERT(msg2->msg_txpeer == txpeer);
1041 LASSERT(msg2->msg_tx_delayed);
1043 (void) lnet_post_send_locked(msg2, 1);
1047 if (txpeer != NULL) {
1048 msg->msg_txpeer = NULL;
1049 lnet_peer_decref_locked(txpeer);
1054 lnet_return_rx_credits_locked(lnet_msg_t *msg)
1056 lnet_peer_t *rxpeer = msg->msg_rxpeer;
1060 if (msg->msg_rtrcredit) {
1061 /* give back global router credits */
1063 lnet_rtrbufpool_t *rbp;
1065 /* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1066 * there until it gets one allocated, or aborts the wait
1068 LASSERT (msg->msg_kiov != NULL);
1070 rb = cfs_list_entry(msg->msg_kiov, lnet_rtrbuf_t, rb_kiov[0]);
1072 LASSERT (rbp == lnet_msg2bufpool(msg));
1074 msg->msg_kiov = NULL;
1075 msg->msg_rtrcredit = 0;
1077 LASSERT((rbp->rbp_credits < 0) ==
1078 !cfs_list_empty(&rbp->rbp_msgs));
1079 LASSERT((rbp->rbp_credits > 0) ==
1080 !cfs_list_empty(&rbp->rbp_bufs));
1082 cfs_list_add(&rb->rb_list, &rbp->rbp_bufs);
1084 if (rbp->rbp_credits <= 0) {
1085 msg2 = cfs_list_entry(rbp->rbp_msgs.next,
1086 lnet_msg_t, msg_list);
1087 cfs_list_del(&msg2->msg_list);
1089 (void) lnet_post_routed_recv_locked(msg2, 1);
1093 if (msg->msg_peerrtrcredit) {
1094 /* give back peer router credits */
1095 msg->msg_peerrtrcredit = 0;
1097 LASSERT((rxpeer->lp_rtrcredits < 0) ==
1098 !cfs_list_empty(&rxpeer->lp_rtrq));
1100 rxpeer->lp_rtrcredits++;
1101 if (rxpeer->lp_rtrcredits <= 0) {
1102 msg2 = cfs_list_entry(rxpeer->lp_rtrq.next,
1103 lnet_msg_t, msg_list);
1104 cfs_list_del(&msg2->msg_list);
1106 (void) lnet_post_routed_recv_locked(msg2, 1);
1110 LASSERT (!msg->msg_rtrcredit);
1111 LASSERT (!msg->msg_peerrtrcredit);
1113 if (rxpeer != NULL) {
1114 msg->msg_rxpeer = NULL;
1115 lnet_peer_decref_locked(rxpeer);
1120 lnet_compare_routes(lnet_route_t *r1, lnet_route_t *r2)
1122 lnet_peer_t *p1 = r1->lr_gateway;
1123 lnet_peer_t *p2 = r2->lr_gateway;
1125 if (r1->lr_hops < r2->lr_hops)
1128 if (r1->lr_hops > r2->lr_hops)
1131 if (p1->lp_txqnob < p2->lp_txqnob)
1134 if (p1->lp_txqnob > p2->lp_txqnob)
1137 if (p1->lp_txcredits > p2->lp_txcredits)
1140 if (p1->lp_txcredits < p2->lp_txcredits)
1143 if (r1->lr_seq - r2->lr_seq <= 0)
1149 static lnet_peer_t *
1150 lnet_find_route_locked(lnet_ni_t *ni, lnet_nid_t target, lnet_nid_t rtr_nid)
1152 lnet_remotenet_t *rnet;
1154 lnet_route_t *rtr_best;
1155 lnet_route_t *rtr_last;
1156 struct lnet_peer *lp_best;
1157 struct lnet_peer *lp;
1160 /* If @rtr_nid is not LNET_NID_ANY, return the gateway with
1161 * rtr_nid nid, otherwise find the best gateway I can use */
1163 rnet = lnet_find_net_locked(LNET_NIDNET(target));
1168 rtr_best = rtr_last = NULL;
1169 cfs_list_for_each_entry(rtr, &rnet->lrn_routes, lr_list) {
1170 lp = rtr->lr_gateway;
1172 if (!lp->lp_alive || /* gateway is down */
1173 ((lp->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0 &&
1174 rtr->lr_downis != 0)) /* NI to target is down */
1177 if (ni != NULL && lp->lp_ni != ni)
1180 if (lp->lp_nid == rtr_nid) /* it's pre-determined router */
1183 if (lp_best == NULL) {
1184 rtr_best = rtr_last = rtr;
1189 /* no protection on below fields, but it's harmless */
1190 if (rtr_last->lr_seq - rtr->lr_seq < 0)
1193 rc = lnet_compare_routes(rtr, rtr_best);
1201 /* set sequence number on the best router to the latest sequence + 1
1202 * so we can round-robin all routers, it's race and inaccurate but
1203 * harmless and functional */
1204 if (rtr_best != NULL)
1205 rtr_best->lr_seq = rtr_last->lr_seq + 1;
1210 lnet_send(lnet_nid_t src_nid, lnet_msg_t *msg, lnet_nid_t rtr_nid)
1212 lnet_nid_t dst_nid = msg->msg_target.nid;
1213 struct lnet_ni *src_ni;
1214 struct lnet_ni *local_ni;
1215 struct lnet_peer *lp;
1220 /* NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
1221 * but we might want to use pre-determined router for ACK/REPLY
1223 /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
1224 LASSERT (msg->msg_txpeer == NULL);
1225 LASSERT (!msg->msg_sending);
1226 LASSERT (!msg->msg_target_is_router);
1227 LASSERT (!msg->msg_receiving);
1229 msg->msg_sending = 1;
1231 LASSERT(!msg->msg_tx_committed);
1232 cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid);
1236 if (the_lnet.ln_shutdown) {
1237 lnet_net_unlock(cpt);
1241 if (src_nid == LNET_NID_ANY) {
1244 src_ni = lnet_nid2ni_locked(src_nid, cpt);
1245 if (src_ni == NULL) {
1246 lnet_net_unlock(cpt);
1247 LCONSOLE_WARN("Can't send to %s: src %s is not a "
1248 "local nid\n", libcfs_nid2str(dst_nid),
1249 libcfs_nid2str(src_nid));
1252 LASSERT (!msg->msg_routing);
1255 /* Is this for someone on a local network? */
1256 local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt);
1258 if (local_ni != NULL) {
1259 if (src_ni == NULL) {
1261 src_nid = src_ni->ni_nid;
1262 } else if (src_ni == local_ni) {
1263 lnet_ni_decref_locked(local_ni, cpt);
1265 lnet_ni_decref_locked(local_ni, cpt);
1266 lnet_ni_decref_locked(src_ni, cpt);
1267 lnet_net_unlock(cpt);
1268 LCONSOLE_WARN("No route to %s via from %s\n",
1269 libcfs_nid2str(dst_nid),
1270 libcfs_nid2str(src_nid));
1274 LASSERT(src_nid != LNET_NID_ANY);
1275 lnet_msg_commit(msg, cpt);
1277 if (!msg->msg_routing)
1278 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1280 if (src_ni == the_lnet.ln_loni) {
1281 /* No send credit hassles with LOLND */
1282 lnet_net_unlock(cpt);
1283 lnet_ni_send(src_ni, msg);
1286 lnet_ni_decref_locked(src_ni, cpt);
1287 lnet_net_unlock(cpt);
1291 rc = lnet_nid2peer_locked(&lp, dst_nid, cpt);
1292 /* lp has ref on src_ni; lose mine */
1293 lnet_ni_decref_locked(src_ni, cpt);
1295 lnet_net_unlock(cpt);
1296 LCONSOLE_WARN("Error %d finding peer %s\n", rc,
1297 libcfs_nid2str(dst_nid));
1298 /* ENOMEM or shutting down */
1301 LASSERT (lp->lp_ni == src_ni);
1304 lnet_net_unlock(cpt);
1307 * - once application finishes computation, check here to update
1308 * router states before it waits for pending IO in LNetEQPoll
1309 * - recursion breaker: router checker sends no message
1310 * to remote networks */
1311 if (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING)
1312 lnet_router_checker();
1316 /* sending to a remote network */
1317 lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid);
1320 lnet_ni_decref_locked(src_ni, cpt);
1321 lnet_net_unlock(cpt);
1323 LCONSOLE_WARN("No route to %s via %s "
1324 "(all routers down)\n",
1325 libcfs_id2str(msg->msg_target),
1326 libcfs_nid2str(src_nid));
1327 return -EHOSTUNREACH;
1330 /* rtr_nid is LNET_NID_ANY or NID of pre-determined router,
1331 * it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't
1332 * pre-determined router, this can happen if router table
1333 * was changed when we release the lock */
1334 if (rtr_nid != lp->lp_nid) {
1335 cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid);
1338 lnet_ni_decref_locked(src_ni, cpt);
1339 lnet_net_unlock(cpt);
1341 rtr_nid = lp->lp_nid;
1347 CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
1348 libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid),
1349 lnet_msgtyp2str(msg->msg_type), msg->msg_len);
1351 if (src_ni == NULL) {
1353 src_nid = src_ni->ni_nid;
1355 LASSERT (src_ni == lp->lp_ni);
1356 lnet_ni_decref_locked(src_ni, cpt);
1359 lnet_peer_addref_locked(lp);
1361 LASSERT(src_nid != LNET_NID_ANY);
1362 lnet_msg_commit(msg, cpt);
1364 if (!msg->msg_routing) {
1365 /* I'm the source and now I know which NI to send on */
1366 msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
1369 msg->msg_target_is_router = 1;
1370 msg->msg_target.nid = lp->lp_nid;
1371 msg->msg_target.pid = LUSTRE_SRV_LNET_PID;
1374 /* 'lp' is our best choice of peer */
1376 LASSERT (!msg->msg_peertxcredit);
1377 LASSERT (!msg->msg_txcredit);
1378 LASSERT (msg->msg_txpeer == NULL);
1380 msg->msg_txpeer = lp; /* msg takes my ref on lp */
1382 rc = lnet_post_send_locked(msg, 0);
1383 lnet_net_unlock(cpt);
1385 if (rc == EHOSTUNREACH)
1386 return -EHOSTUNREACH;
1389 lnet_ni_send(src_ni, msg);
1395 lnet_drop_message(lnet_ni_t *ni, int cpt, void *private, unsigned int nob)
1398 the_lnet.ln_counters[cpt]->drop_count++;
1399 the_lnet.ln_counters[cpt]->drop_length += nob;
1400 lnet_net_unlock(cpt);
1402 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
1406 lnet_recv_put(lnet_ni_t *ni, lnet_msg_t *msg)
1408 lnet_hdr_t *hdr = &msg->msg_hdr;
1410 if (msg->msg_wanted != 0)
1411 lnet_setpayloadbuffer(msg);
1413 lnet_build_msg_event(msg, LNET_EVENT_PUT);
1415 /* Must I ACK? If so I'll grab the ack_wmd out of the header and put
1416 * it back into the ACK during lnet_finalize() */
1417 msg->msg_ack = (!lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
1418 (msg->msg_md->md_options & LNET_MD_ACK_DISABLE) == 0);
1420 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
1421 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
1425 lnet_parse_put(lnet_ni_t *ni, lnet_msg_t *msg)
1427 lnet_hdr_t *hdr = &msg->msg_hdr;
1428 struct lnet_match_info info;
1431 /* Convert put fields to host byte order */
1432 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
1433 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
1434 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
1436 info.mi_id.nid = hdr->src_nid;
1437 info.mi_id.pid = hdr->src_pid;
1438 info.mi_opc = LNET_MD_OP_PUT;
1439 info.mi_portal = hdr->msg.put.ptl_index;
1440 info.mi_rlength = hdr->payload_length;
1441 info.mi_roffset = hdr->msg.put.offset;
1442 info.mi_mbits = hdr->msg.put.match_bits;
1444 msg->msg_rx_ready_delay = ni->ni_lnd->lnd_eager_recv == NULL;
1447 rc = lnet_ptl_match_md(&info, msg);
1452 case LNET_MATCHMD_OK:
1453 lnet_recv_put(ni, msg);
1456 case LNET_MATCHMD_NONE:
1457 if (msg->msg_rx_delayed) /* attached on delayed list */
1460 rc = lnet_ni_eager_recv(ni, msg);
1465 case LNET_MATCHMD_DROP:
1466 CNETERR("Dropping PUT from %s portal %d match "LPU64
1467 " offset %d length %d: %d\n",
1468 libcfs_id2str(info.mi_id), info.mi_portal,
1469 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
1471 return ENOENT; /* +ve: OK but no match */
1476 lnet_parse_get(lnet_ni_t *ni, lnet_msg_t *msg, int rdma_get)
1478 struct lnet_match_info info;
1479 lnet_hdr_t *hdr = &msg->msg_hdr;
1480 lnet_handle_wire_t reply_wmd;
1483 /* Convert get fields to host byte order */
1484 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
1485 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
1486 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
1487 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
1489 info.mi_id.nid = hdr->src_nid;
1490 info.mi_id.pid = hdr->src_pid;
1491 info.mi_opc = LNET_MD_OP_GET;
1492 info.mi_portal = hdr->msg.get.ptl_index;
1493 info.mi_rlength = hdr->msg.get.sink_length;
1494 info.mi_roffset = hdr->msg.get.src_offset;
1495 info.mi_mbits = hdr->msg.get.match_bits;
1497 rc = lnet_ptl_match_md(&info, msg);
1498 if (rc == LNET_MATCHMD_DROP) {
1499 CNETERR("Dropping GET from %s portal %d match "LPU64
1500 " offset %d length %d\n",
1501 libcfs_id2str(info.mi_id), info.mi_portal,
1502 info.mi_mbits, info.mi_roffset, info.mi_rlength);
1503 return ENOENT; /* +ve: OK but no match */
1506 LASSERT(rc == LNET_MATCHMD_OK);
1508 lnet_build_msg_event(msg, LNET_EVENT_GET);
1510 reply_wmd = hdr->msg.get.return_wmd;
1512 lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id,
1513 msg->msg_offset, msg->msg_wanted);
1515 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
1518 /* The LND completes the REPLY from her recv procedure */
1519 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1520 msg->msg_offset, msg->msg_len, msg->msg_len);
1524 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
1525 msg->msg_receiving = 0;
1527 rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
1529 /* didn't get as far as lnet_ni_send() */
1530 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
1531 libcfs_nid2str(ni->ni_nid),
1532 libcfs_id2str(info.mi_id), rc);
1534 lnet_finalize(ni, msg, rc);
1541 lnet_parse_reply(lnet_ni_t *ni, lnet_msg_t *msg)
1543 void *private = msg->msg_private;
1544 lnet_hdr_t *hdr = &msg->msg_hdr;
1545 lnet_process_id_t src = {0};
1551 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
1554 src.nid = hdr->src_nid;
1555 src.pid = hdr->src_pid;
1557 /* NB handles only looked up by creator (no flips) */
1558 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
1559 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
1560 CNETERR("%s: Dropping REPLY from %s for %s "
1561 "MD "LPX64"."LPX64"\n",
1562 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1563 (md == NULL) ? "invalid" : "inactive",
1564 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1565 hdr->msg.reply.dst_wmd.wh_object_cookie);
1566 if (md != NULL && md->md_me != NULL)
1567 CERROR("REPLY MD also attached to portal %d\n",
1568 md->md_me->me_portal);
1570 lnet_res_unlock(cpt);
1571 return ENOENT; /* +ve: OK but no match */
1574 LASSERT (md->md_offset == 0);
1576 rlength = hdr->payload_length;
1577 mlength = MIN(rlength, (int)md->md_length);
1579 if (mlength < rlength &&
1580 (md->md_options & LNET_MD_TRUNCATE) == 0) {
1581 CNETERR("%s: Dropping REPLY from %s length %d "
1582 "for MD "LPX64" would overflow (%d)\n",
1583 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1584 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
1586 lnet_res_unlock(cpt);
1587 return ENOENT; /* +ve: OK but no match */
1590 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md "LPX64"\n",
1591 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1592 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
1594 lnet_msg_attach_md(msg, md, 0, mlength);
1597 lnet_setpayloadbuffer(msg);
1599 lnet_res_unlock(cpt);
1601 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
1603 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
1608 lnet_parse_ack(lnet_ni_t *ni, lnet_msg_t *msg)
1610 lnet_hdr_t *hdr = &msg->msg_hdr;
1611 lnet_process_id_t src = {0};
1615 src.nid = hdr->src_nid;
1616 src.pid = hdr->src_pid;
1618 /* Convert ack fields to host byte order */
1619 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
1620 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
1622 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
1625 /* NB handles only looked up by creator (no flips) */
1626 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
1627 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
1628 /* Don't moan; this is expected */
1630 "%s: Dropping ACK from %s to %s MD "LPX64"."LPX64"\n",
1631 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1632 (md == NULL) ? "invalid" : "inactive",
1633 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1634 hdr->msg.ack.dst_wmd.wh_object_cookie);
1635 if (md != NULL && md->md_me != NULL)
1636 CERROR("Source MD also attached to portal %d\n",
1637 md->md_me->me_portal);
1639 lnet_res_unlock(cpt);
1640 return ENOENT; /* +ve! */
1643 CDEBUG(D_NET, "%s: ACK from %s into md "LPX64"\n",
1644 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
1645 hdr->msg.ack.dst_wmd.wh_object_cookie);
1647 lnet_msg_attach_md(msg, md, 0, 0);
1649 lnet_res_unlock(cpt);
1651 lnet_build_msg_event(msg, LNET_EVENT_ACK);
1653 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
1658 lnet_parse_forward_locked(lnet_ni_t *ni, lnet_msg_t *msg)
1663 if (msg->msg_rxpeer->lp_rtrcredits <= 0 ||
1664 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
1665 if (ni->ni_lnd->lnd_eager_recv == NULL) {
1666 msg->msg_rx_ready_delay = 1;
1668 lnet_net_unlock(msg->msg_rx_cpt);
1669 rc = lnet_ni_eager_recv(ni, msg);
1670 lnet_net_lock(msg->msg_rx_cpt);
1675 rc = lnet_post_routed_recv_locked(msg, 0);
1683 lnet_msgtyp2str (int type)
1692 case LNET_MSG_REPLY:
1694 case LNET_MSG_HELLO:
1697 return ("<UNKNOWN>");
1700 EXPORT_SYMBOL(lnet_msgtyp2str);
1703 lnet_print_hdr(lnet_hdr_t * hdr)
1705 lnet_process_id_t src = {0};
1706 lnet_process_id_t dst = {0};
1707 char *type_str = lnet_msgtyp2str (hdr->type);
1709 src.nid = hdr->src_nid;
1710 src.pid = hdr->src_pid;
1712 dst.nid = hdr->dest_nid;
1713 dst.pid = hdr->dest_pid;
1715 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
1716 CWARN(" From %s\n", libcfs_id2str(src));
1717 CWARN(" To %s\n", libcfs_id2str(dst));
1719 switch (hdr->type) {
1724 CWARN(" Ptl index %d, ack md "LPX64"."LPX64", "
1725 "match bits "LPU64"\n",
1726 hdr->msg.put.ptl_index,
1727 hdr->msg.put.ack_wmd.wh_interface_cookie,
1728 hdr->msg.put.ack_wmd.wh_object_cookie,
1729 hdr->msg.put.match_bits);
1730 CWARN(" Length %d, offset %d, hdr data "LPX64"\n",
1731 hdr->payload_length, hdr->msg.put.offset,
1732 hdr->msg.put.hdr_data);
1736 CWARN(" Ptl index %d, return md "LPX64"."LPX64", "
1737 "match bits "LPU64"\n", hdr->msg.get.ptl_index,
1738 hdr->msg.get.return_wmd.wh_interface_cookie,
1739 hdr->msg.get.return_wmd.wh_object_cookie,
1740 hdr->msg.get.match_bits);
1741 CWARN(" Length %d, src offset %d\n",
1742 hdr->msg.get.sink_length,
1743 hdr->msg.get.src_offset);
1747 CWARN(" dst md "LPX64"."LPX64", "
1748 "manipulated length %d\n",
1749 hdr->msg.ack.dst_wmd.wh_interface_cookie,
1750 hdr->msg.ack.dst_wmd.wh_object_cookie,
1751 hdr->msg.ack.mlength);
1754 case LNET_MSG_REPLY:
1755 CWARN(" dst md "LPX64"."LPX64", "
1757 hdr->msg.reply.dst_wmd.wh_interface_cookie,
1758 hdr->msg.reply.dst_wmd.wh_object_cookie,
1759 hdr->payload_length);
1765 lnet_parse(lnet_ni_t *ni, lnet_hdr_t *hdr, lnet_nid_t from_nid,
1766 void *private, int rdma_req)
1771 struct lnet_msg *msg;
1772 lnet_pid_t dest_pid;
1773 lnet_nid_t dest_nid;
1775 __u32 payload_length;
1778 LASSERT (!cfs_in_interrupt ());
1780 type = le32_to_cpu(hdr->type);
1781 src_nid = le64_to_cpu(hdr->src_nid);
1782 dest_nid = le64_to_cpu(hdr->dest_nid);
1783 dest_pid = le32_to_cpu(hdr->dest_pid);
1784 payload_length = le32_to_cpu(hdr->payload_length);
1786 for_me = (ni->ni_nid == dest_nid);
1787 cpt = lnet_cpt_of_nid(from_nid);
1792 if (payload_length > 0) {
1793 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
1794 libcfs_nid2str(from_nid),
1795 libcfs_nid2str(src_nid),
1796 lnet_msgtyp2str(type), payload_length);
1802 case LNET_MSG_REPLY:
1803 if (payload_length > (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
1804 CERROR("%s, src %s: bad %s payload %d "
1805 "(%d max expected)\n",
1806 libcfs_nid2str(from_nid),
1807 libcfs_nid2str(src_nid),
1808 lnet_msgtyp2str(type),
1810 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
1816 CERROR("%s, src %s: Bad message type 0x%x\n",
1817 libcfs_nid2str(from_nid),
1818 libcfs_nid2str(src_nid), type);
1822 if (the_lnet.ln_routing &&
1823 ni->ni_last_alive != cfs_time_current_sec()) {
1826 /* NB: so far here is the only place to set NI status to "up */
1827 ni->ni_last_alive = cfs_time_current_sec();
1828 if (ni->ni_status != NULL &&
1829 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
1830 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
1834 /* Regard a bad destination NID as a protocol error. Senders should
1835 * know what they're doing; if they don't they're misconfigured, buggy
1836 * or malicious so we chop them off at the knees :) */
1839 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
1840 /* should have gone direct */
1841 CERROR ("%s, src %s: Bad dest nid %s "
1842 "(should have been sent direct)\n",
1843 libcfs_nid2str(from_nid),
1844 libcfs_nid2str(src_nid),
1845 libcfs_nid2str(dest_nid));
1849 if (lnet_islocalnid(dest_nid)) {
1850 /* dest is another local NI; sender should have used
1851 * this node's NID on its own network */
1852 CERROR ("%s, src %s: Bad dest nid %s "
1853 "(it's my nid but on a different network)\n",
1854 libcfs_nid2str(from_nid),
1855 libcfs_nid2str(src_nid),
1856 libcfs_nid2str(dest_nid));
1860 if (rdma_req && type == LNET_MSG_GET) {
1861 CERROR ("%s, src %s: Bad optimized GET for %s "
1862 "(final destination must be me)\n",
1863 libcfs_nid2str(from_nid),
1864 libcfs_nid2str(src_nid),
1865 libcfs_nid2str(dest_nid));
1869 if (!the_lnet.ln_routing) {
1870 CERROR ("%s, src %s: Dropping message for %s "
1871 "(routing not enabled)\n",
1872 libcfs_nid2str(from_nid),
1873 libcfs_nid2str(src_nid),
1874 libcfs_nid2str(dest_nid));
1879 /* Message looks OK; we're not going to return an error, so we MUST
1880 * call back lnd_recv() come what may... */
1882 if (!cfs_list_empty (&the_lnet.ln_test_peers) && /* normally we don't */
1883 fail_peer (src_nid, 0)) /* shall we now? */
1885 CERROR("%s, src %s: Dropping %s to simulate failure\n",
1886 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1887 lnet_msgtyp2str(type));
1891 msg = lnet_msg_alloc();
1893 CERROR("%s, src %s: Dropping %s (out of memory)\n",
1894 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1895 lnet_msgtyp2str(type));
1899 /* msg zeroed in lnet_msg_alloc; i.e. flags all clear, pointers NULL etc */
1901 msg->msg_type = type;
1902 msg->msg_private = private;
1903 msg->msg_receiving = 1;
1904 msg->msg_len = msg->msg_wanted = payload_length;
1905 msg->msg_offset = 0;
1906 msg->msg_hdr = *hdr;
1907 /* for building message event */
1908 msg->msg_from = from_nid;
1910 msg->msg_target.pid = dest_pid;
1911 msg->msg_target.nid = dest_nid;
1912 msg->msg_routing = 1;
1915 /* convert common msg->hdr fields to host byteorder */
1916 msg->msg_hdr.type = type;
1917 msg->msg_hdr.src_nid = src_nid;
1918 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
1919 msg->msg_hdr.dest_nid = dest_nid;
1920 msg->msg_hdr.dest_pid = dest_pid;
1921 msg->msg_hdr.payload_length = payload_length;
1925 rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt);
1927 lnet_net_unlock(cpt);
1928 CERROR("%s, src %s: Dropping %s "
1929 "(error %d looking up sender)\n",
1930 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
1931 lnet_msgtyp2str(type), rc);
1936 lnet_msg_commit(msg, cpt);
1939 rc = lnet_parse_forward_locked(ni, msg);
1940 lnet_net_unlock(cpt);
1945 lnet_ni_recv(ni, msg->msg_private, msg, 0,
1946 0, payload_length, payload_length);
1951 lnet_net_unlock(cpt);
1955 rc = lnet_parse_ack(ni, msg);
1958 rc = lnet_parse_put(ni, msg);
1961 rc = lnet_parse_get(ni, msg, rdma_req);
1963 case LNET_MSG_REPLY:
1964 rc = lnet_parse_reply(ni, msg);
1969 goto free_drop; /* prevent an unused label if !kernel */
1975 LASSERT (rc == ENOENT);
1978 LASSERT(msg->msg_md == NULL);
1979 lnet_finalize(ni, msg, rc);
1982 lnet_drop_message(ni, cpt, private, payload_length);
1985 EXPORT_SYMBOL(lnet_parse);
1988 lnet_drop_delayed_msg_list(cfs_list_t *head, char *reason)
1990 while (!cfs_list_empty(head)) {
1991 lnet_process_id_t id = {0};
1994 msg = cfs_list_entry(head->next, lnet_msg_t, msg_list);
1995 cfs_list_del(&msg->msg_list);
1997 id.nid = msg->msg_hdr.src_nid;
1998 id.pid = msg->msg_hdr.src_pid;
2000 LASSERT(msg->msg_md == NULL);
2001 LASSERT(msg->msg_rx_delayed);
2002 LASSERT(msg->msg_rxpeer != NULL);
2003 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2005 CWARN("Dropping delayed PUT from %s portal %d match "LPU64
2006 " offset %d length %d: %s\n",
2008 msg->msg_hdr.msg.put.ptl_index,
2009 msg->msg_hdr.msg.put.match_bits,
2010 msg->msg_hdr.msg.put.offset,
2011 msg->msg_hdr.payload_length, reason);
2013 /* NB I can't drop msg's ref on msg_rxpeer until after I've
2014 * called lnet_drop_message(), so I just hang onto msg as well
2015 * until that's done */
2017 lnet_drop_message(msg->msg_rxpeer->lp_ni,
2018 msg->msg_rxpeer->lp_cpt,
2019 msg->msg_private, msg->msg_len);
2021 * NB: message will not generate event because w/o attached MD,
2022 * but we still should give error code so lnet_msg_decommit()
2023 * can skip counters operations and other checks.
2025 lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT);
2030 lnet_recv_delayed_msg_list(cfs_list_t *head)
2032 while (!cfs_list_empty(head)) {
2034 lnet_process_id_t id;
2036 msg = cfs_list_entry(head->next, lnet_msg_t, msg_list);
2037 cfs_list_del(&msg->msg_list);
2039 /* md won't disappear under me, since each msg
2040 * holds a ref on it */
2042 id.nid = msg->msg_hdr.src_nid;
2043 id.pid = msg->msg_hdr.src_pid;
2045 LASSERT(msg->msg_rx_delayed);
2046 LASSERT(msg->msg_md != NULL);
2047 LASSERT(msg->msg_rxpeer != NULL);
2048 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
2050 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
2051 "match "LPU64" offset %d length %d.\n",
2052 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
2053 msg->msg_hdr.msg.put.match_bits,
2054 msg->msg_hdr.msg.put.offset,
2055 msg->msg_hdr.payload_length);
2057 lnet_recv_put(msg->msg_rxpeer->lp_ni, msg);
2062 * Initiate an asynchronous PUT operation.
2064 * There are several events associated with a PUT: completion of the send on
2065 * the initiator node (LNET_EVENT_SEND), and when the send completes
2066 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
2067 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
2068 * used at the target node to indicate the completion of incoming data
2071 * The local events will be logged in the EQ associated with the MD pointed to
2072 * by \a mdh handle. Using a MD without an associated EQ results in these
2073 * events being discarded. In this case, the caller must have another
2074 * mechanism (e.g., a higher level protocol) for determining when it is safe
2075 * to modify the memory region associated with the MD.
2077 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
2078 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
2080 * \param self Indicates the NID of a local interface through which to send
2081 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
2082 * \param mdh A handle for the MD that describes the memory to be sent. The MD
2083 * must be "free floating" (See LNetMDBind()).
2084 * \param ack Controls whether an acknowledgment is requested.
2085 * Acknowledgments are only sent when they are requested by the initiating
2086 * process and the target MD enables them.
2087 * \param target A process identifier for the target process.
2088 * \param portal The index in the \a target's portal table.
2089 * \param match_bits The match bits to use for MD selection at the target
2091 * \param offset The offset into the target MD (only used when the target
2092 * MD has the LNET_MD_MANAGE_REMOTE option set).
2093 * \param hdr_data 64 bits of user data that can be included in the message
2094 * header. This data is written to an event queue entry at the target if an
2095 * EQ is present on the matching MD.
2097 * \retval 0 Success, and only in this case events will be generated
2098 * and logged to EQ (if it exists).
2099 * \retval -EIO Simulated failure.
2100 * \retval -ENOMEM Memory allocation failure.
2101 * \retval -ENOENT Invalid MD object.
2103 * \see lnet_event_t::hdr_data and lnet_event_kind_t.
2106 LNetPut(lnet_nid_t self, lnet_handle_md_t mdh, lnet_ack_req_t ack,
2107 lnet_process_id_t target, unsigned int portal,
2108 __u64 match_bits, unsigned int offset,
2111 struct lnet_msg *msg;
2112 struct lnet_libmd *md;
2116 LASSERT (the_lnet.ln_init);
2117 LASSERT (the_lnet.ln_refcount > 0);
2119 if (!cfs_list_empty (&the_lnet.ln_test_peers) && /* normally we don't */
2120 fail_peer (target.nid, 1)) /* shall we now? */
2122 CERROR("Dropping PUT to %s: simulated failure\n",
2123 libcfs_id2str(target));
2127 msg = lnet_msg_alloc();
2129 CERROR("Dropping PUT to %s: ENOMEM on lnet_msg_t\n",
2130 libcfs_id2str(target));
2133 msg->msg_vmflush = !!memory_pressure_get();
2135 cpt = lnet_cpt_of_cookie(mdh.cookie);
2138 md = lnet_handle2md(&mdh);
2139 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2140 CERROR("Dropping PUT ("LPU64":%d:%s): MD (%d) invalid\n",
2141 match_bits, portal, libcfs_id2str(target),
2142 md == NULL ? -1 : md->md_threshold);
2143 if (md != NULL && md->md_me != NULL)
2144 CERROR("Source MD also attached to portal %d\n",
2145 md->md_me->me_portal);
2146 lnet_res_unlock(cpt);
2152 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
2154 lnet_msg_attach_md(msg, md, 0, 0);
2156 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
2158 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
2159 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
2160 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
2161 msg->msg_hdr.msg.put.hdr_data = hdr_data;
2163 /* NB handles only looked up by creator (no flips) */
2164 if (ack == LNET_ACK_REQ) {
2165 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2166 the_lnet.ln_interface_cookie;
2167 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2168 md->md_lh.lh_cookie;
2170 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
2171 LNET_WIRE_HANDLE_COOKIE_NONE;
2172 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
2173 LNET_WIRE_HANDLE_COOKIE_NONE;
2176 lnet_res_unlock(cpt);
2178 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2180 rc = lnet_send(self, msg, LNET_NID_ANY);
2182 CNETERR( "Error sending PUT to %s: %d\n",
2183 libcfs_id2str(target), rc);
2184 lnet_finalize (NULL, msg, rc);
2187 /* completion will be signalled by an event */
2190 EXPORT_SYMBOL(LNetPut);
2193 lnet_create_reply_msg (lnet_ni_t *ni, lnet_msg_t *getmsg)
2195 /* The LND can DMA direct to the GET md (i.e. no REPLY msg). This
2196 * returns a msg for the LND to pass to lnet_finalize() when the sink
2197 * data has been received.
2199 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
2200 * lnet_finalize() is called on it, so the LND must call this first */
2202 struct lnet_msg *msg = lnet_msg_alloc();
2203 struct lnet_libmd *getmd = getmsg->msg_md;
2204 lnet_process_id_t peer_id = getmsg->msg_target;
2207 LASSERT(!getmsg->msg_target_is_router);
2208 LASSERT(!getmsg->msg_routing);
2210 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
2213 LASSERT (getmd->md_refcount > 0);
2216 CERROR ("%s: Dropping REPLY from %s: can't allocate msg\n",
2217 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
2221 if (getmd->md_threshold == 0) {
2222 CERROR ("%s: Dropping REPLY from %s for inactive MD %p\n",
2223 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
2225 lnet_res_unlock(cpt);
2229 LASSERT(getmd->md_offset == 0);
2231 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
2232 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
2234 /* setup information for lnet_build_msg_event */
2235 msg->msg_from = peer_id.nid;
2236 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
2237 msg->msg_hdr.src_nid = peer_id.nid;
2238 msg->msg_hdr.payload_length = getmd->md_length;
2239 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
2241 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
2242 lnet_res_unlock(cpt);
2244 cpt = lnet_cpt_of_nid(peer_id.nid);
2247 lnet_msg_commit(msg, cpt);
2248 lnet_net_unlock(cpt);
2250 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2255 cpt = lnet_cpt_of_nid(peer_id.nid);
2258 the_lnet.ln_counters[cpt]->drop_count++;
2259 the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
2260 lnet_net_unlock(cpt);
2267 EXPORT_SYMBOL(lnet_create_reply_msg);
2270 lnet_set_reply_msg_len(lnet_ni_t *ni, lnet_msg_t *reply, unsigned int len)
2272 /* Set the REPLY length, now the RDMA that elides the REPLY message has
2273 * completed and I know it. */
2274 LASSERT (reply != NULL);
2275 LASSERT (reply->msg_type == LNET_MSG_GET);
2276 LASSERT (reply->msg_ev.type == LNET_EVENT_REPLY);
2278 /* NB I trusted my peer to RDMA. If she tells me she's written beyond
2279 * the end of my buffer, I might as well be dead. */
2280 LASSERT (len <= reply->msg_ev.mlength);
2282 reply->msg_ev.mlength = len;
2284 EXPORT_SYMBOL(lnet_set_reply_msg_len);
2287 * Initiate an asynchronous GET operation.
2289 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
2290 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
2291 * the target node in the REPLY has been written to local MD.
2293 * On the target node, an LNET_EVENT_GET is logged when the GET request
2294 * arrives and is accepted into a MD.
2296 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
2297 * \param mdh A handle for the MD that describes the memory into which the
2298 * requested data will be received. The MD must be "free floating" (See LNetMDBind()).
2300 * \retval 0 Success, and only in this case events will be generated
2301 * and logged to EQ (if it exists) of the MD.
2302 * \retval -EIO Simulated failure.
2303 * \retval -ENOMEM Memory allocation failure.
2304 * \retval -ENOENT Invalid MD object.
2307 LNetGet(lnet_nid_t self, lnet_handle_md_t mdh,
2308 lnet_process_id_t target, unsigned int portal,
2309 __u64 match_bits, unsigned int offset)
2311 struct lnet_msg *msg;
2312 struct lnet_libmd *md;
2316 LASSERT (the_lnet.ln_init);
2317 LASSERT (the_lnet.ln_refcount > 0);
2319 if (!cfs_list_empty (&the_lnet.ln_test_peers) && /* normally we don't */
2320 fail_peer (target.nid, 1)) /* shall we now? */
2322 CERROR("Dropping GET to %s: simulated failure\n",
2323 libcfs_id2str(target));
2327 msg = lnet_msg_alloc();
2329 CERROR("Dropping GET to %s: ENOMEM on lnet_msg_t\n",
2330 libcfs_id2str(target));
2334 cpt = lnet_cpt_of_cookie(mdh.cookie);
2337 md = lnet_handle2md(&mdh);
2338 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2339 CERROR("Dropping GET ("LPU64":%d:%s): MD (%d) invalid\n",
2340 match_bits, portal, libcfs_id2str(target),
2341 md == NULL ? -1 : md->md_threshold);
2342 if (md != NULL && md->md_me != NULL)
2343 CERROR("REPLY MD also attached to portal %d\n",
2344 md->md_me->me_portal);
2346 lnet_res_unlock(cpt);
2353 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
2355 lnet_msg_attach_md(msg, md, 0, 0);
2357 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
2359 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
2360 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
2361 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
2362 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
2364 /* NB handles only looked up by creator (no flips) */
2365 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
2366 the_lnet.ln_interface_cookie;
2367 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
2368 md->md_lh.lh_cookie;
2370 lnet_res_unlock(cpt);
2372 lnet_build_msg_event(msg, LNET_EVENT_SEND);
2374 rc = lnet_send(self, msg, LNET_NID_ANY);
2376 CNETERR( "Error sending GET to %s: %d\n",
2377 libcfs_id2str(target), rc);
2378 lnet_finalize (NULL, msg, rc);
2381 /* completion will be signalled by an event */
2384 EXPORT_SYMBOL(LNetGet);
2387 * Calculate distance to node at \a dstnid.
2389 * \param dstnid Target NID.
2390 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
2392 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
2395 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
2396 * local_nid_dist_zero is set, which is the default.
2397 * \retval positives Distance to target NID, i.e. number of hops plus one.
2398 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
2401 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
2405 lnet_remotenet_t *rnet;
2406 __u32 dstnet = LNET_NIDNET(dstnid);
2410 cfs_list_t *rn_list;
2412 /* if !local_nid_dist_zero, I don't return a distance of 0 ever
2413 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
2414 * keep order 0 free for 0@lo and order 1 free for a local NID
2417 LASSERT (the_lnet.ln_init);
2418 LASSERT (the_lnet.ln_refcount > 0);
2420 cpt = lnet_net_lock_current();
2422 cfs_list_for_each (e, &the_lnet.ln_nis) {
2423 ni = cfs_list_entry(e, lnet_ni_t, ni_list);
2425 if (ni->ni_nid == dstnid) {
2426 if (srcnidp != NULL)
2428 if (orderp != NULL) {
2429 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
2434 lnet_net_unlock(cpt);
2436 return local_nid_dist_zero ? 0 : 1;
2439 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
2440 if (srcnidp != NULL)
2441 *srcnidp = ni->ni_nid;
2444 lnet_net_unlock(cpt);
2451 rn_list = lnet_net2rnethash(dstnet);
2452 cfs_list_for_each(e, rn_list) {
2453 rnet = cfs_list_entry(e, lnet_remotenet_t, lrn_list);
2455 if (rnet->lrn_net == dstnet) {
2456 lnet_route_t *route;
2457 lnet_route_t *shortest = NULL;
2459 LASSERT (!cfs_list_empty(&rnet->lrn_routes));
2461 cfs_list_for_each_entry(route, &rnet->lrn_routes,
2463 if (shortest == NULL ||
2464 route->lr_hops < shortest->lr_hops)
2468 LASSERT (shortest != NULL);
2469 hops = shortest->lr_hops;
2470 if (srcnidp != NULL)
2471 *srcnidp = shortest->lr_gateway->lp_ni->ni_nid;
2474 lnet_net_unlock(cpt);
2480 lnet_net_unlock(cpt);
2481 return -EHOSTUNREACH;
2483 EXPORT_SYMBOL(LNetDist);
2486 * Set the number of asynchronous messages expected from a target process.
2488 * This function is only meaningful for userspace callers. It's a no-op when
2489 * called from kernel.
2491 * Asynchronous messages are those that can come from a target when the
2492 * userspace process is not waiting for IO to complete; e.g., AST callbacks
2493 * from Lustre servers. Specifying the expected number of such messages
2494 * allows them to be eagerly received when user process is not running in
2495 * LNet; otherwise network errors may occur.
2497 * \param id Process ID of the target process.
2498 * \param nasync Number of asynchronous messages expected from the target.
2500 * \return 0 on success, and an error code otherwise.
2503 LNetSetAsync(lnet_process_id_t id, int nasync)
2509 lnet_remotenet_t *rnet;
2511 lnet_route_t *route;
2519 /* Target on a local network? */
2520 ni = lnet_net2ni(LNET_NIDNET(id.nid));
2522 if (ni->ni_lnd->lnd_setasync != NULL)
2523 rc = (ni->ni_lnd->lnd_setasync)(ni, id, nasync);
2528 /* Target on a remote network: apply to routers */
2530 LIBCFS_ALLOC(nids, maxnids * sizeof(*nids));
2535 /* Snapshot all the router NIDs */
2536 cpt = lnet_net_lock_current();
2537 rnet = lnet_find_net_locked(LNET_NIDNET(id.nid));
2539 cfs_list_for_each(tmp, &rnet->lrn_routes) {
2540 if (nnids == maxnids) {
2541 lnet_net_unlock(cpt);
2542 LIBCFS_FREE(nids, maxnids * sizeof(*nids));
2547 route = cfs_list_entry(tmp, lnet_route_t, lr_list);
2548 nids[nnids++] = route->lr_gateway->lp_nid;
2551 lnet_net_unlock(cpt);
2553 /* set async on all the routers */
2554 while (nnids-- > 0) {
2555 id.pid = LUSTRE_SRV_LNET_PID;
2556 id.nid = nids[nnids];
2558 ni = lnet_net2ni(LNET_NIDNET(id.nid));
2562 if (ni->ni_lnd->lnd_setasync != NULL) {
2563 rc2 = (ni->ni_lnd->lnd_setasync)(ni, id, nasync);
2570 LIBCFS_FREE(nids, maxnids * sizeof(*nids));
2574 EXPORT_SYMBOL(LNetSetAsync);