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, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lnet/lnet/lib-move.c
34 * Data movement routines
37 #define DEBUG_SUBSYSTEM S_LNET
39 #include <linux/pagemap.h>
41 #include <lnet/lib-lnet.h>
42 #include <linux/nsproxy.h>
43 #include <net/net_namespace.h>
45 static int local_nid_dist_zero = 1;
46 module_param(local_nid_dist_zero, int, 0444);
47 MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
49 struct lnet_send_data {
50 struct lnet_ni *sd_best_ni;
51 struct lnet_peer_ni *sd_best_lpni;
52 struct lnet_peer_ni *sd_final_dst_lpni;
53 struct lnet_peer *sd_peer;
54 struct lnet_peer *sd_gw_peer;
55 struct lnet_peer_ni *sd_gw_lpni;
56 struct lnet_peer_net *sd_peer_net;
57 struct lnet_msg *sd_msg;
58 lnet_nid_t sd_dst_nid;
59 lnet_nid_t sd_src_nid;
60 lnet_nid_t sd_rtr_nid;
66 static inline struct lnet_comm_count *
67 get_stats_counts(struct lnet_element_stats *stats,
68 enum lnet_stats_type stats_type)
71 case LNET_STATS_TYPE_SEND:
72 return &stats->el_send_stats;
73 case LNET_STATS_TYPE_RECV:
74 return &stats->el_recv_stats;
75 case LNET_STATS_TYPE_DROP:
76 return &stats->el_drop_stats;
78 CERROR("Unknown stats type\n");
84 void lnet_incr_stats(struct lnet_element_stats *stats,
85 enum lnet_msg_type msg_type,
86 enum lnet_stats_type stats_type)
88 struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
94 atomic_inc(&counts->co_ack_count);
97 atomic_inc(&counts->co_put_count);
100 atomic_inc(&counts->co_get_count);
103 atomic_inc(&counts->co_reply_count);
106 atomic_inc(&counts->co_hello_count);
109 CERROR("There is a BUG in the code. Unknown message type\n");
114 __u32 lnet_sum_stats(struct lnet_element_stats *stats,
115 enum lnet_stats_type stats_type)
117 struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
121 return (atomic_read(&counts->co_ack_count) +
122 atomic_read(&counts->co_put_count) +
123 atomic_read(&counts->co_get_count) +
124 atomic_read(&counts->co_reply_count) +
125 atomic_read(&counts->co_hello_count));
128 static inline void assign_stats(struct lnet_ioctl_comm_count *msg_stats,
129 struct lnet_comm_count *counts)
131 msg_stats->ico_get_count = atomic_read(&counts->co_get_count);
132 msg_stats->ico_put_count = atomic_read(&counts->co_put_count);
133 msg_stats->ico_reply_count = atomic_read(&counts->co_reply_count);
134 msg_stats->ico_ack_count = atomic_read(&counts->co_ack_count);
135 msg_stats->ico_hello_count = atomic_read(&counts->co_hello_count);
138 void lnet_usr_translate_stats(struct lnet_ioctl_element_msg_stats *msg_stats,
139 struct lnet_element_stats *stats)
141 struct lnet_comm_count *counts;
146 counts = get_stats_counts(stats, LNET_STATS_TYPE_SEND);
149 assign_stats(&msg_stats->im_send_stats, counts);
151 counts = get_stats_counts(stats, LNET_STATS_TYPE_RECV);
154 assign_stats(&msg_stats->im_recv_stats, counts);
156 counts = get_stats_counts(stats, LNET_STATS_TYPE_DROP);
159 assign_stats(&msg_stats->im_drop_stats, counts);
163 lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
165 struct lnet_test_peer *tp;
166 struct list_head *el;
167 struct list_head *next;
168 struct list_head cull;
170 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
171 if (threshold != 0) {
172 /* Adding a new entry */
173 LIBCFS_ALLOC(tp, sizeof(*tp));
178 tp->tp_threshold = threshold;
181 list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
186 /* removing entries */
187 INIT_LIST_HEAD(&cull);
191 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
192 tp = list_entry(el, struct lnet_test_peer, tp_list);
194 if (tp->tp_threshold == 0 || /* needs culling anyway */
195 nid == LNET_NID_ANY || /* removing all entries */
196 tp->tp_nid == nid) { /* matched this one */
197 list_del(&tp->tp_list);
198 list_add(&tp->tp_list, &cull);
204 while (!list_empty(&cull)) {
205 tp = list_entry(cull.next, struct lnet_test_peer, tp_list);
207 list_del(&tp->tp_list);
208 LIBCFS_FREE(tp, sizeof(*tp));
214 fail_peer (lnet_nid_t nid, int outgoing)
216 struct lnet_test_peer *tp;
217 struct list_head *el;
218 struct list_head *next;
219 struct list_head cull;
222 INIT_LIST_HEAD(&cull);
224 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
227 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
228 tp = list_entry(el, struct lnet_test_peer, tp_list);
230 if (tp->tp_threshold == 0) {
233 /* only cull zombies on outgoing tests,
234 * since we may be at interrupt priority on
235 * incoming messages. */
236 list_del(&tp->tp_list);
237 list_add(&tp->tp_list, &cull);
242 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
243 nid == tp->tp_nid) { /* fail this peer */
246 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
249 tp->tp_threshold == 0) {
251 list_del(&tp->tp_list);
252 list_add(&tp->tp_list, &cull);
261 while (!list_empty(&cull)) {
262 tp = list_entry(cull.next, struct lnet_test_peer, tp_list);
263 list_del(&tp->tp_list);
265 LIBCFS_FREE(tp, sizeof(*tp));
272 lnet_iov_nob(unsigned int niov, struct kvec *iov)
274 unsigned int nob = 0;
276 LASSERT(niov == 0 || iov != NULL);
278 nob += (iov++)->iov_len;
282 EXPORT_SYMBOL(lnet_iov_nob);
285 lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset,
286 unsigned int nsiov, struct kvec *siov, unsigned int soffset,
289 /* NB diov, siov are READ-ONLY */
290 unsigned int this_nob;
295 /* skip complete frags before 'doffset' */
297 while (doffset >= diov->iov_len) {
298 doffset -= diov->iov_len;
304 /* skip complete frags before 'soffset' */
306 while (soffset >= siov->iov_len) {
307 soffset -= siov->iov_len;
316 this_nob = MIN(diov->iov_len - doffset,
317 siov->iov_len - soffset);
318 this_nob = MIN(this_nob, nob);
320 memcpy((char *)diov->iov_base + doffset,
321 (char *)siov->iov_base + soffset, this_nob);
324 if (diov->iov_len > doffset + this_nob) {
332 if (siov->iov_len > soffset + this_nob) {
341 EXPORT_SYMBOL(lnet_copy_iov2iov);
344 lnet_extract_iov(int dst_niov, struct kvec *dst,
345 int src_niov, struct kvec *src,
346 unsigned int offset, unsigned int len)
348 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
349 * for exactly 'len' bytes, and return the number of entries.
350 * NB not destructive to 'src' */
351 unsigned int frag_len;
354 if (len == 0) /* no data => */
355 return (0); /* no frags */
357 LASSERT(src_niov > 0);
358 while (offset >= src->iov_len) { /* skip initial frags */
359 offset -= src->iov_len;
362 LASSERT(src_niov > 0);
367 LASSERT(src_niov > 0);
368 LASSERT((int)niov <= dst_niov);
370 frag_len = src->iov_len - offset;
371 dst->iov_base = ((char *)src->iov_base) + offset;
373 if (len <= frag_len) {
378 dst->iov_len = frag_len;
388 EXPORT_SYMBOL(lnet_extract_iov);
392 lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov)
394 unsigned int nob = 0;
396 LASSERT(niov == 0 || kiov != NULL);
398 nob += (kiov++)->kiov_len;
402 EXPORT_SYMBOL(lnet_kiov_nob);
405 lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
406 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
409 /* NB diov, siov are READ-ONLY */
410 unsigned int this_nob;
417 LASSERT (!in_interrupt ());
420 while (doffset >= diov->kiov_len) {
421 doffset -= diov->kiov_len;
428 while (soffset >= siov->kiov_len) {
429 soffset -= siov->kiov_len;
438 this_nob = MIN(diov->kiov_len - doffset,
439 siov->kiov_len - soffset);
440 this_nob = MIN(this_nob, nob);
443 daddr = ((char *)kmap(diov->kiov_page)) +
444 diov->kiov_offset + doffset;
446 saddr = ((char *)kmap(siov->kiov_page)) +
447 siov->kiov_offset + soffset;
449 /* Vanishing risk of kmap deadlock when mapping 2 pages.
450 * However in practice at least one of the kiovs will be mapped
451 * kernel pages and the map/unmap will be NOOPs */
453 memcpy (daddr, saddr, this_nob);
456 if (diov->kiov_len > doffset + this_nob) {
460 kunmap(diov->kiov_page);
467 if (siov->kiov_len > soffset + this_nob) {
471 kunmap(siov->kiov_page);
480 kunmap(diov->kiov_page);
482 kunmap(siov->kiov_page);
484 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
487 lnet_copy_kiov2iov (unsigned int niov, struct kvec *iov, unsigned int iovoffset,
488 unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
491 /* NB iov, kiov are READ-ONLY */
492 unsigned int this_nob;
498 LASSERT (!in_interrupt ());
501 while (iovoffset >= iov->iov_len) {
502 iovoffset -= iov->iov_len;
509 while (kiovoffset >= kiov->kiov_len) {
510 kiovoffset -= kiov->kiov_len;
519 this_nob = MIN(iov->iov_len - iovoffset,
520 kiov->kiov_len - kiovoffset);
521 this_nob = MIN(this_nob, nob);
524 addr = ((char *)kmap(kiov->kiov_page)) +
525 kiov->kiov_offset + kiovoffset;
527 memcpy((char *)iov->iov_base + iovoffset, addr, this_nob);
530 if (iov->iov_len > iovoffset + this_nob) {
531 iovoffset += this_nob;
538 if (kiov->kiov_len > kiovoffset + this_nob) {
540 kiovoffset += this_nob;
542 kunmap(kiov->kiov_page);
552 kunmap(kiov->kiov_page);
554 EXPORT_SYMBOL(lnet_copy_kiov2iov);
557 lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
558 unsigned int niov, struct kvec *iov, unsigned int iovoffset,
561 /* NB kiov, iov are READ-ONLY */
562 unsigned int this_nob;
568 LASSERT (!in_interrupt ());
571 while (kiovoffset >= kiov->kiov_len) {
572 kiovoffset -= kiov->kiov_len;
579 while (iovoffset >= iov->iov_len) {
580 iovoffset -= iov->iov_len;
589 this_nob = MIN(kiov->kiov_len - kiovoffset,
590 iov->iov_len - iovoffset);
591 this_nob = MIN(this_nob, nob);
594 addr = ((char *)kmap(kiov->kiov_page)) +
595 kiov->kiov_offset + kiovoffset;
597 memcpy (addr, (char *)iov->iov_base + iovoffset, this_nob);
600 if (kiov->kiov_len > kiovoffset + this_nob) {
602 kiovoffset += this_nob;
604 kunmap(kiov->kiov_page);
611 if (iov->iov_len > iovoffset + this_nob) {
612 iovoffset += this_nob;
621 kunmap(kiov->kiov_page);
623 EXPORT_SYMBOL(lnet_copy_iov2kiov);
626 lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst,
627 int src_niov, lnet_kiov_t *src,
628 unsigned int offset, unsigned int len)
630 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
631 * for exactly 'len' bytes, and return the number of entries.
632 * NB not destructive to 'src' */
633 unsigned int frag_len;
636 if (len == 0) /* no data => */
637 return (0); /* no frags */
639 LASSERT(src_niov > 0);
640 while (offset >= src->kiov_len) { /* skip initial frags */
641 offset -= src->kiov_len;
644 LASSERT(src_niov > 0);
649 LASSERT(src_niov > 0);
650 LASSERT((int)niov <= dst_niov);
652 frag_len = src->kiov_len - offset;
653 dst->kiov_page = src->kiov_page;
654 dst->kiov_offset = src->kiov_offset + offset;
656 if (len <= frag_len) {
658 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
662 dst->kiov_len = frag_len;
663 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
673 EXPORT_SYMBOL(lnet_extract_kiov);
676 lnet_ni_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
677 int delayed, unsigned int offset, unsigned int mlen,
680 unsigned int niov = 0;
681 struct kvec *iov = NULL;
682 lnet_kiov_t *kiov = NULL;
685 LASSERT (!in_interrupt ());
686 LASSERT (mlen == 0 || msg != NULL);
689 LASSERT(msg->msg_receiving);
690 LASSERT(!msg->msg_sending);
691 LASSERT(rlen == msg->msg_len);
692 LASSERT(mlen <= msg->msg_len);
693 LASSERT(msg->msg_offset == offset);
694 LASSERT(msg->msg_wanted == mlen);
696 msg->msg_receiving = 0;
699 niov = msg->msg_niov;
701 kiov = msg->msg_kiov;
704 LASSERT ((iov == NULL) != (kiov == NULL));
708 rc = (ni->ni_net->net_lnd->lnd_recv)(ni, private, msg, delayed,
709 niov, iov, kiov, offset, mlen,
712 lnet_finalize(msg, rc);
716 lnet_setpayloadbuffer(struct lnet_msg *msg)
718 struct lnet_libmd *md = msg->msg_md;
720 LASSERT(msg->msg_len > 0);
721 LASSERT(!msg->msg_routing);
723 LASSERT(msg->msg_niov == 0);
724 LASSERT(msg->msg_iov == NULL);
725 LASSERT(msg->msg_kiov == NULL);
727 msg->msg_niov = md->md_niov;
728 if ((md->md_options & LNET_MD_KIOV) != 0)
729 msg->msg_kiov = md->md_iov.kiov;
731 msg->msg_iov = md->md_iov.iov;
735 lnet_prep_send(struct lnet_msg *msg, int type, struct lnet_process_id target,
736 unsigned int offset, unsigned int len)
738 msg->msg_type = type;
739 msg->msg_target = target;
741 msg->msg_offset = offset;
744 lnet_setpayloadbuffer(msg);
746 memset (&msg->msg_hdr, 0, sizeof (msg->msg_hdr));
747 msg->msg_hdr.type = cpu_to_le32(type);
748 /* dest_nid will be overwritten by lnet_select_pathway() */
749 msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
750 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
751 /* src_nid will be set later */
752 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
753 msg->msg_hdr.payload_length = cpu_to_le32(len);
757 lnet_ni_send(struct lnet_ni *ni, struct lnet_msg *msg)
759 void *priv = msg->msg_private;
762 LASSERT (!in_interrupt ());
763 LASSERT (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
764 (msg->msg_txcredit && msg->msg_peertxcredit));
766 rc = (ni->ni_net->net_lnd->lnd_send)(ni, priv, msg);
768 lnet_finalize(msg, rc);
772 lnet_ni_eager_recv(struct lnet_ni *ni, struct lnet_msg *msg)
776 LASSERT(!msg->msg_sending);
777 LASSERT(msg->msg_receiving);
778 LASSERT(!msg->msg_rx_ready_delay);
779 LASSERT(ni->ni_net->net_lnd->lnd_eager_recv != NULL);
781 msg->msg_rx_ready_delay = 1;
782 rc = (ni->ni_net->net_lnd->lnd_eager_recv)(ni, msg->msg_private, msg,
785 CERROR("recv from %s / send to %s aborted: "
786 "eager_recv failed %d\n",
787 libcfs_nid2str(msg->msg_rxpeer->lpni_nid),
788 libcfs_id2str(msg->msg_target), rc);
789 LASSERT(rc < 0); /* required by my callers */
796 * This function can be called from two paths:
797 * 1. when sending a message
798 * 2. when decommiting a message (lnet_msg_decommit_tx())
799 * In both these cases the peer_ni should have it's reference count
800 * acquired by the caller and therefore it is safe to drop the spin
801 * lock before calling lnd_query()
804 lnet_ni_query_locked(struct lnet_ni *ni, struct lnet_peer_ni *lp)
806 time64_t last_alive = 0;
807 int cpt = lnet_cpt_of_nid_locked(lp->lpni_nid, ni);
809 LASSERT(lnet_peer_aliveness_enabled(lp));
810 LASSERT(ni->ni_net->net_lnd->lnd_query != NULL);
812 lnet_net_unlock(cpt);
813 (ni->ni_net->net_lnd->lnd_query)(ni, lp->lpni_nid, &last_alive);
816 lp->lpni_last_query = ktime_get_seconds();
818 if (last_alive != 0) /* NI has updated timestamp */
819 lp->lpni_last_alive = last_alive;
822 /* NB: always called with lnet_net_lock held */
824 lnet_peer_is_alive(struct lnet_peer_ni *lp, time64_t now)
829 LASSERT (lnet_peer_aliveness_enabled(lp));
832 * Trust lnet_notify() if it has more recent aliveness news, but
833 * ignore the initial assumed death (see lnet_peers_start_down()).
835 spin_lock(&lp->lpni_lock);
836 if (!lp->lpni_alive && lp->lpni_alive_count > 0 &&
837 lp->lpni_timestamp >= lp->lpni_last_alive) {
838 spin_unlock(&lp->lpni_lock);
842 deadline = lp->lpni_last_alive +
843 lp->lpni_net->net_tunables.lct_peer_timeout;
844 alive = deadline > now;
847 * Update obsolete lp_alive except for routers assumed to be dead
848 * initially, because router checker would update aliveness in this
849 * case, and moreover lpni_last_alive at peer creation is assumed.
851 if (alive && !lp->lpni_alive &&
852 !(lnet_isrouter(lp) && lp->lpni_alive_count == 0)) {
853 spin_unlock(&lp->lpni_lock);
854 lnet_notify_locked(lp, 0, 1, lp->lpni_last_alive);
856 spin_unlock(&lp->lpni_lock);
863 /* NB: returns 1 when alive, 0 when dead, negative when error;
864 * may drop the lnet_net_lock */
866 lnet_peer_alive_locked(struct lnet_ni *ni, struct lnet_peer_ni *lp)
868 time64_t now = ktime_get_seconds();
870 if (!lnet_peer_aliveness_enabled(lp))
873 if (lnet_peer_is_alive(lp, now))
877 * Peer appears dead, but we should avoid frequent NI queries (at
878 * most once per lnet_queryinterval seconds).
880 if (lp->lpni_last_query != 0) {
881 static const int lnet_queryinterval = 1;
884 next_query = lp->lpni_last_query + lnet_queryinterval;
886 if (now < next_query) {
888 CWARN("Unexpected aliveness of peer %s: "
889 "%lld < %lld (%d/%d)\n",
890 libcfs_nid2str(lp->lpni_nid),
893 lp->lpni_net->net_tunables.lct_peer_timeout);
898 /* query NI for latest aliveness news */
899 lnet_ni_query_locked(ni, lp);
901 if (lnet_peer_is_alive(lp, now))
904 lnet_notify_locked(lp, 0, 0, lp->lpni_last_alive);
909 * \param msg The message to be sent.
910 * \param do_send True if lnet_ni_send() should be called in this function.
911 * lnet_send() is going to lnet_net_unlock immediately after this, so
912 * it sets do_send FALSE and I don't do the unlock/send/lock bit.
914 * \retval LNET_CREDIT_OK If \a msg sent or OK to send.
915 * \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
916 * \retval -EHOSTUNREACH If the next hop of the message appears dead.
917 * \retval -ECANCELED If the MD of the message has been unlinked.
920 lnet_post_send_locked(struct lnet_msg *msg, int do_send)
922 struct lnet_peer_ni *lp = msg->msg_txpeer;
923 struct lnet_ni *ni = msg->msg_txni;
924 int cpt = msg->msg_tx_cpt;
925 struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt];
927 /* non-lnet_send() callers have checked before */
928 LASSERT(!do_send || msg->msg_tx_delayed);
929 LASSERT(!msg->msg_receiving);
930 LASSERT(msg->msg_tx_committed);
932 /* NB 'lp' is always the next hop */
933 if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
934 lnet_peer_alive_locked(ni, lp) == 0) {
935 the_lnet.ln_counters[cpt]->drop_count++;
936 the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
937 lnet_net_unlock(cpt);
939 lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
941 LNET_STATS_TYPE_DROP);
943 lnet_incr_stats(&msg->msg_txni->ni_stats,
945 LNET_STATS_TYPE_DROP);
947 CNETERR("Dropping message for %s: peer not alive\n",
948 libcfs_id2str(msg->msg_target));
950 lnet_finalize(msg, -EHOSTUNREACH);
953 return -EHOSTUNREACH;
956 if (msg->msg_md != NULL &&
957 (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED) != 0) {
958 lnet_net_unlock(cpt);
960 CNETERR("Aborting message for %s: LNetM[DE]Unlink() already "
961 "called on the MD/ME.\n",
962 libcfs_id2str(msg->msg_target));
964 lnet_finalize(msg, -ECANCELED);
970 if (!msg->msg_peertxcredit) {
971 spin_lock(&lp->lpni_lock);
972 LASSERT((lp->lpni_txcredits < 0) ==
973 !list_empty(&lp->lpni_txq));
975 msg->msg_peertxcredit = 1;
976 lp->lpni_txqnob += msg->msg_len + sizeof(struct lnet_hdr);
977 lp->lpni_txcredits--;
979 if (lp->lpni_txcredits < lp->lpni_mintxcredits)
980 lp->lpni_mintxcredits = lp->lpni_txcredits;
982 if (lp->lpni_txcredits < 0) {
983 msg->msg_tx_delayed = 1;
984 list_add_tail(&msg->msg_list, &lp->lpni_txq);
985 spin_unlock(&lp->lpni_lock);
986 return LNET_CREDIT_WAIT;
988 spin_unlock(&lp->lpni_lock);
991 if (!msg->msg_txcredit) {
992 LASSERT((tq->tq_credits < 0) ==
993 !list_empty(&tq->tq_delayed));
995 msg->msg_txcredit = 1;
997 atomic_dec(&ni->ni_tx_credits);
999 if (tq->tq_credits < tq->tq_credits_min)
1000 tq->tq_credits_min = tq->tq_credits;
1002 if (tq->tq_credits < 0) {
1003 msg->msg_tx_delayed = 1;
1004 list_add_tail(&msg->msg_list, &tq->tq_delayed);
1005 return LNET_CREDIT_WAIT;
1010 lnet_net_unlock(cpt);
1011 lnet_ni_send(ni, msg);
1014 return LNET_CREDIT_OK;
1018 static struct lnet_rtrbufpool *
1019 lnet_msg2bufpool(struct lnet_msg *msg)
1021 struct lnet_rtrbufpool *rbp;
1024 LASSERT(msg->msg_rx_committed);
1026 cpt = msg->msg_rx_cpt;
1027 rbp = &the_lnet.ln_rtrpools[cpt][0];
1029 LASSERT(msg->msg_len <= LNET_MTU);
1030 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_SIZE) {
1032 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
1039 lnet_post_routed_recv_locked(struct lnet_msg *msg, int do_recv)
1041 /* lnet_parse is going to lnet_net_unlock immediately after this, so it
1042 * sets do_recv FALSE and I don't do the unlock/send/lock bit.
1043 * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
1044 * received or OK to receive */
1045 struct lnet_peer_ni *lp = msg->msg_rxpeer;
1046 struct lnet_rtrbufpool *rbp;
1047 struct lnet_rtrbuf *rb;
1049 LASSERT (msg->msg_iov == NULL);
1050 LASSERT (msg->msg_kiov == NULL);
1051 LASSERT (msg->msg_niov == 0);
1052 LASSERT (msg->msg_routing);
1053 LASSERT (msg->msg_receiving);
1054 LASSERT (!msg->msg_sending);
1056 /* non-lnet_parse callers only receive delayed messages */
1057 LASSERT(!do_recv || msg->msg_rx_delayed);
1059 if (!msg->msg_peerrtrcredit) {
1060 spin_lock(&lp->lpni_lock);
1061 LASSERT((lp->lpni_rtrcredits < 0) ==
1062 !list_empty(&lp->lpni_rtrq));
1064 msg->msg_peerrtrcredit = 1;
1065 lp->lpni_rtrcredits--;
1066 if (lp->lpni_rtrcredits < lp->lpni_minrtrcredits)
1067 lp->lpni_minrtrcredits = lp->lpni_rtrcredits;
1069 if (lp->lpni_rtrcredits < 0) {
1070 /* must have checked eager_recv before here */
1071 LASSERT(msg->msg_rx_ready_delay);
1072 msg->msg_rx_delayed = 1;
1073 list_add_tail(&msg->msg_list, &lp->lpni_rtrq);
1074 spin_unlock(&lp->lpni_lock);
1075 return LNET_CREDIT_WAIT;
1077 spin_unlock(&lp->lpni_lock);
1080 rbp = lnet_msg2bufpool(msg);
1082 if (!msg->msg_rtrcredit) {
1083 msg->msg_rtrcredit = 1;
1085 if (rbp->rbp_credits < rbp->rbp_mincredits)
1086 rbp->rbp_mincredits = rbp->rbp_credits;
1088 if (rbp->rbp_credits < 0) {
1089 /* must have checked eager_recv before here */
1090 LASSERT(msg->msg_rx_ready_delay);
1091 msg->msg_rx_delayed = 1;
1092 list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
1093 return LNET_CREDIT_WAIT;
1097 LASSERT(!list_empty(&rbp->rbp_bufs));
1098 rb = list_entry(rbp->rbp_bufs.next, struct lnet_rtrbuf, rb_list);
1099 list_del(&rb->rb_list);
1101 msg->msg_niov = rbp->rbp_npages;
1102 msg->msg_kiov = &rb->rb_kiov[0];
1105 int cpt = msg->msg_rx_cpt;
1107 lnet_net_unlock(cpt);
1108 lnet_ni_recv(msg->msg_rxni, msg->msg_private, msg, 1,
1109 0, msg->msg_len, msg->msg_len);
1112 return LNET_CREDIT_OK;
1116 lnet_return_tx_credits_locked(struct lnet_msg *msg)
1118 struct lnet_peer_ni *txpeer = msg->msg_txpeer;
1119 struct lnet_ni *txni = msg->msg_txni;
1120 struct lnet_msg *msg2;
1122 if (msg->msg_txcredit) {
1123 struct lnet_ni *ni = msg->msg_txni;
1124 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
1126 /* give back NI txcredits */
1127 msg->msg_txcredit = 0;
1129 LASSERT((tq->tq_credits < 0) ==
1130 !list_empty(&tq->tq_delayed));
1133 atomic_inc(&ni->ni_tx_credits);
1134 if (tq->tq_credits <= 0) {
1135 msg2 = list_entry(tq->tq_delayed.next,
1136 struct lnet_msg, msg_list);
1137 list_del(&msg2->msg_list);
1139 LASSERT(msg2->msg_txni == ni);
1140 LASSERT(msg2->msg_tx_delayed);
1141 LASSERT(msg2->msg_tx_cpt == msg->msg_tx_cpt);
1143 (void) lnet_post_send_locked(msg2, 1);
1147 if (msg->msg_peertxcredit) {
1148 /* give back peer txcredits */
1149 msg->msg_peertxcredit = 0;
1151 spin_lock(&txpeer->lpni_lock);
1152 LASSERT((txpeer->lpni_txcredits < 0) ==
1153 !list_empty(&txpeer->lpni_txq));
1155 txpeer->lpni_txqnob -= msg->msg_len + sizeof(struct lnet_hdr);
1156 LASSERT(txpeer->lpni_txqnob >= 0);
1158 txpeer->lpni_txcredits++;
1159 if (txpeer->lpni_txcredits <= 0) {
1162 msg2 = list_entry(txpeer->lpni_txq.next,
1163 struct lnet_msg, msg_list);
1164 list_del(&msg2->msg_list);
1165 spin_unlock(&txpeer->lpni_lock);
1167 LASSERT(msg2->msg_txpeer == txpeer);
1168 LASSERT(msg2->msg_tx_delayed);
1170 msg2_cpt = msg2->msg_tx_cpt;
1173 * The msg_cpt can be different from the msg2_cpt
1174 * so we need to make sure we lock the correct cpt
1176 * Once we call lnet_post_send_locked() it is no
1177 * longer safe to access msg2, since it could've
1178 * been freed by lnet_finalize(), but we still
1179 * need to relock the correct cpt, so we cache the
1180 * msg2_cpt for the purpose of the check that
1181 * follows the call to lnet_pose_send_locked().
1183 if (msg2_cpt != msg->msg_tx_cpt) {
1184 lnet_net_unlock(msg->msg_tx_cpt);
1185 lnet_net_lock(msg2_cpt);
1187 (void) lnet_post_send_locked(msg2, 1);
1188 if (msg2_cpt != msg->msg_tx_cpt) {
1189 lnet_net_unlock(msg2_cpt);
1190 lnet_net_lock(msg->msg_tx_cpt);
1193 spin_unlock(&txpeer->lpni_lock);
1198 msg->msg_txni = NULL;
1199 lnet_ni_decref_locked(txni, msg->msg_tx_cpt);
1202 if (txpeer != NULL) {
1205 * Once the patch for the health comes in we need to set
1206 * the health of the peer ni to bad when we fail to send
1208 * int status = msg->msg_ev.status;
1210 * lnet_set_peer_ni_health_locked(txpeer, false)
1212 msg->msg_txpeer = NULL;
1213 lnet_peer_ni_decref_locked(txpeer);
1218 lnet_schedule_blocked_locked(struct lnet_rtrbufpool *rbp)
1220 struct lnet_msg *msg;
1222 if (list_empty(&rbp->rbp_msgs))
1224 msg = list_entry(rbp->rbp_msgs.next,
1225 struct lnet_msg, msg_list);
1226 list_del(&msg->msg_list);
1228 (void)lnet_post_routed_recv_locked(msg, 1);
1232 lnet_drop_routed_msgs_locked(struct list_head *list, int cpt)
1234 struct lnet_msg *msg;
1235 struct lnet_msg *tmp;
1237 lnet_net_unlock(cpt);
1239 list_for_each_entry_safe(msg, tmp, list, msg_list) {
1240 lnet_ni_recv(msg->msg_rxni, msg->msg_private, NULL,
1241 0, 0, 0, msg->msg_hdr.payload_length);
1242 list_del_init(&msg->msg_list);
1243 lnet_finalize(msg, -ECANCELED);
1250 lnet_return_rx_credits_locked(struct lnet_msg *msg)
1252 struct lnet_peer_ni *rxpeer = msg->msg_rxpeer;
1253 struct lnet_ni *rxni = msg->msg_rxni;
1254 struct lnet_msg *msg2;
1256 if (msg->msg_rtrcredit) {
1257 /* give back global router credits */
1258 struct lnet_rtrbuf *rb;
1259 struct lnet_rtrbufpool *rbp;
1261 /* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1262 * there until it gets one allocated, or aborts the wait
1264 LASSERT(msg->msg_kiov != NULL);
1266 rb = list_entry(msg->msg_kiov, struct lnet_rtrbuf, rb_kiov[0]);
1269 msg->msg_kiov = NULL;
1270 msg->msg_rtrcredit = 0;
1272 LASSERT(rbp == lnet_msg2bufpool(msg));
1274 LASSERT((rbp->rbp_credits > 0) ==
1275 !list_empty(&rbp->rbp_bufs));
1277 /* If routing is now turned off, we just drop this buffer and
1278 * don't bother trying to return credits. */
1279 if (!the_lnet.ln_routing) {
1280 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1284 /* It is possible that a user has lowered the desired number of
1285 * buffers in this pool. Make sure we never put back
1286 * more buffers than the stated number. */
1287 if (unlikely(rbp->rbp_credits >= rbp->rbp_req_nbuffers)) {
1288 /* Discard this buffer so we don't have too
1290 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1291 rbp->rbp_nbuffers--;
1293 list_add(&rb->rb_list, &rbp->rbp_bufs);
1295 if (rbp->rbp_credits <= 0)
1296 lnet_schedule_blocked_locked(rbp);
1301 if (msg->msg_peerrtrcredit) {
1302 /* give back peer router credits */
1303 msg->msg_peerrtrcredit = 0;
1305 spin_lock(&rxpeer->lpni_lock);
1306 LASSERT((rxpeer->lpni_rtrcredits < 0) ==
1307 !list_empty(&rxpeer->lpni_rtrq));
1309 rxpeer->lpni_rtrcredits++;
1311 /* drop all messages which are queued to be routed on that
1313 if (!the_lnet.ln_routing) {
1314 struct list_head drop;
1315 INIT_LIST_HEAD(&drop);
1316 list_splice_init(&rxpeer->lpni_rtrq, &drop);
1317 spin_unlock(&rxpeer->lpni_lock);
1318 lnet_drop_routed_msgs_locked(&drop, msg->msg_rx_cpt);
1319 } else if (rxpeer->lpni_rtrcredits <= 0) {
1320 msg2 = list_entry(rxpeer->lpni_rtrq.next,
1321 struct lnet_msg, msg_list);
1322 list_del(&msg2->msg_list);
1323 spin_unlock(&rxpeer->lpni_lock);
1324 (void) lnet_post_routed_recv_locked(msg2, 1);
1326 spin_unlock(&rxpeer->lpni_lock);
1330 msg->msg_rxni = NULL;
1331 lnet_ni_decref_locked(rxni, msg->msg_rx_cpt);
1333 if (rxpeer != NULL) {
1334 msg->msg_rxpeer = NULL;
1335 lnet_peer_ni_decref_locked(rxpeer);
1340 lnet_compare_peers(struct lnet_peer_ni *p1, struct lnet_peer_ni *p2)
1342 if (p1->lpni_txqnob < p2->lpni_txqnob)
1345 if (p1->lpni_txqnob > p2->lpni_txqnob)
1348 if (p1->lpni_txcredits > p2->lpni_txcredits)
1351 if (p1->lpni_txcredits < p2->lpni_txcredits)
1358 lnet_compare_routes(struct lnet_route *r1, struct lnet_route *r2)
1360 struct lnet_peer_ni *p1 = r1->lr_gateway;
1361 struct lnet_peer_ni *p2 = r2->lr_gateway;
1362 int r1_hops = (r1->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r1->lr_hops;
1363 int r2_hops = (r2->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r2->lr_hops;
1366 if (r1->lr_priority < r2->lr_priority)
1369 if (r1->lr_priority > r2->lr_priority)
1372 if (r1_hops < r2_hops)
1375 if (r1_hops > r2_hops)
1378 rc = lnet_compare_peers(p1, p2);
1382 if (r1->lr_seq - r2->lr_seq <= 0)
1388 static struct lnet_peer_ni *
1389 lnet_find_route_locked(struct lnet_net *net, __u32 remote_net,
1392 struct lnet_remotenet *rnet;
1393 struct lnet_route *route;
1394 struct lnet_route *best_route;
1395 struct lnet_route *last_route;
1396 struct lnet_peer_ni *lpni_best;
1397 struct lnet_peer_ni *lp;
1400 /* If @rtr_nid is not LNET_NID_ANY, return the gateway with
1401 * rtr_nid nid, otherwise find the best gateway I can use */
1403 rnet = lnet_find_rnet_locked(remote_net);
1408 best_route = last_route = NULL;
1409 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
1410 lp = route->lr_gateway;
1412 if (!lnet_is_route_alive(route))
1415 if (net != NULL && lp->lpni_net != net)
1418 if (lp->lpni_nid == rtr_nid) /* it's pre-determined router */
1421 if (lpni_best == NULL) {
1422 best_route = last_route = route;
1427 /* no protection on below fields, but it's harmless */
1428 if (last_route->lr_seq - route->lr_seq < 0)
1431 rc = lnet_compare_routes(route, best_route);
1439 /* set sequence number on the best router to the latest sequence + 1
1440 * so we can round-robin all routers, it's race and inaccurate but
1441 * harmless and functional */
1442 if (best_route != NULL)
1443 best_route->lr_seq = last_route->lr_seq + 1;
1447 static struct lnet_ni *
1448 lnet_get_best_ni(struct lnet_net *local_net, struct lnet_ni *best_ni,
1449 struct lnet_peer *peer, struct lnet_peer_net *peer_net,
1452 struct lnet_ni *ni = NULL;
1453 unsigned int shortest_distance;
1458 * If there is no peer_ni that we can send to on this network,
1459 * then there is no point in looking for a new best_ni here.
1461 if (!lnet_get_next_peer_ni_locked(peer, peer_net, NULL))
1464 if (best_ni == NULL) {
1465 shortest_distance = UINT_MAX;
1466 best_credits = INT_MIN;
1469 shortest_distance = cfs_cpt_distance(lnet_cpt_table(), md_cpt,
1470 best_ni->ni_dev_cpt);
1471 best_credits = atomic_read(&best_ni->ni_tx_credits);
1472 best_healthv = atomic_read(&best_ni->ni_healthv);
1475 while ((ni = lnet_get_next_ni_locked(local_net, ni))) {
1476 unsigned int distance;
1480 ni_credits = atomic_read(&ni->ni_tx_credits);
1481 ni_healthv = atomic_read(&ni->ni_healthv);
1484 * calculate the distance from the CPT on which
1485 * the message memory is allocated to the CPT of
1486 * the NI's physical device
1488 distance = cfs_cpt_distance(lnet_cpt_table(),
1492 CDEBUG(D_NET, "compare ni %s [c:%d, d:%d, s:%d] with best_ni %s [c:%d, d:%d, s:%d]\n",
1493 libcfs_nid2str(ni->ni_nid), ni_credits, distance,
1494 ni->ni_seq, (best_ni) ? libcfs_nid2str(best_ni->ni_nid)
1495 : "not seleced", best_credits, shortest_distance,
1496 (best_ni) ? best_ni->ni_seq : 0);
1499 * All distances smaller than the NUMA range
1500 * are treated equally.
1502 if (distance < lnet_numa_range)
1503 distance = lnet_numa_range;
1506 * Select on health, shorter distance, available
1507 * credits, then round-robin.
1509 if (ni_healthv < best_healthv) {
1511 } else if (distance > shortest_distance) {
1513 } else if (distance < shortest_distance) {
1514 shortest_distance = distance;
1515 } else if (ni_credits < best_credits) {
1517 } else if (ni_credits == best_credits) {
1518 if (best_ni && best_ni->ni_seq <= ni->ni_seq)
1522 best_credits = ni_credits;
1523 best_healthv = ni_healthv;
1526 CDEBUG(D_NET, "selected best_ni %s\n",
1527 (best_ni) ? libcfs_nid2str(best_ni->ni_nid) : "no selection");
1533 * Traffic to the LNET_RESERVED_PORTAL may not trigger peer discovery,
1534 * because such traffic is required to perform discovery. We therefore
1535 * exclude all GET and PUT on that portal. We also exclude all ACK and
1536 * REPLY traffic, but that is because the portal is not tracked in the
1537 * message structure for these message types. We could restrict this
1538 * further by also checking for LNET_PROTO_PING_MATCHBITS.
1541 lnet_msg_discovery(struct lnet_msg *msg)
1543 if (msg->msg_type == LNET_MSG_PUT) {
1544 if (msg->msg_hdr.msg.put.ptl_index != LNET_RESERVED_PORTAL)
1546 } else if (msg->msg_type == LNET_MSG_GET) {
1547 if (msg->msg_hdr.msg.get.ptl_index != LNET_RESERVED_PORTAL)
1553 #define SRC_SPEC 0x0001
1554 #define SRC_ANY 0x0002
1555 #define LOCAL_DST 0x0004
1556 #define REMOTE_DST 0x0008
1557 #define MR_DST 0x0010
1558 #define NMR_DST 0x0020
1559 #define SND_RESP 0x0040
1561 /* The following to defines are used for return codes */
1562 #define REPEAT_SEND 0x1000
1563 #define PASS_THROUGH 0x2000
1565 /* The different cases lnet_select pathway needs to handle */
1566 #define SRC_SPEC_LOCAL_MR_DST (SRC_SPEC | LOCAL_DST | MR_DST)
1567 #define SRC_SPEC_ROUTER_MR_DST (SRC_SPEC | REMOTE_DST | MR_DST)
1568 #define SRC_SPEC_LOCAL_NMR_DST (SRC_SPEC | LOCAL_DST | NMR_DST)
1569 #define SRC_SPEC_ROUTER_NMR_DST (SRC_SPEC | REMOTE_DST | NMR_DST)
1570 #define SRC_ANY_LOCAL_MR_DST (SRC_ANY | LOCAL_DST | MR_DST)
1571 #define SRC_ANY_ROUTER_MR_DST (SRC_ANY | REMOTE_DST | MR_DST)
1572 #define SRC_ANY_LOCAL_NMR_DST (SRC_ANY | LOCAL_DST | NMR_DST)
1573 #define SRC_ANY_ROUTER_NMR_DST (SRC_ANY | REMOTE_DST | NMR_DST)
1576 lnet_handle_send(struct lnet_send_data *sd)
1578 struct lnet_ni *best_ni = sd->sd_best_ni;
1579 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
1580 struct lnet_peer_ni *final_dst_lpni = sd->sd_final_dst_lpni;
1581 struct lnet_msg *msg = sd->sd_msg;
1583 __u32 send_case = sd->sd_send_case;
1585 __u32 routing = send_case & REMOTE_DST;
1588 * Increment sequence number of the selected peer so that we
1589 * pick the next one in Round Robin.
1591 best_lpni->lpni_seq++;
1594 * grab a reference on the peer_ni so it sticks around even if
1595 * we need to drop and relock the lnet_net_lock below.
1597 lnet_peer_ni_addref_locked(best_lpni);
1600 * Use lnet_cpt_of_nid() to determine the CPT used to commit the
1601 * message. This ensures that we get a CPT that is correct for
1602 * the NI when the NI has been restricted to a subset of all CPTs.
1603 * If the selected CPT differs from the one currently locked, we
1604 * must unlock and relock the lnet_net_lock(), and then check whether
1605 * the configuration has changed. We don't have a hold on the best_ni
1606 * yet, and it may have vanished.
1608 cpt2 = lnet_cpt_of_nid_locked(best_lpni->lpni_nid, best_ni);
1609 if (sd->sd_cpt != cpt2) {
1610 __u32 seq = lnet_get_dlc_seq_locked();
1611 lnet_net_unlock(sd->sd_cpt);
1613 lnet_net_lock(sd->sd_cpt);
1614 if (seq != lnet_get_dlc_seq_locked()) {
1615 lnet_peer_ni_decref_locked(best_lpni);
1621 * store the best_lpni in the message right away to avoid having
1622 * to do the same operation under different conditions
1624 msg->msg_txpeer = best_lpni;
1625 msg->msg_txni = best_ni;
1628 * grab a reference for the best_ni since now it's in use in this
1629 * send. The reference will be dropped in lnet_finalize()
1631 lnet_ni_addref_locked(msg->msg_txni, sd->sd_cpt);
1634 * Always set the target.nid to the best peer picked. Either the
1635 * NID will be one of the peer NIDs selected, or the same NID as
1636 * what was originally set in the target or it will be the NID of
1637 * a router if this message should be routed
1639 msg->msg_target.nid = msg->msg_txpeer->lpni_nid;
1642 * lnet_msg_commit assigns the correct cpt to the message, which
1643 * is used to decrement the correct refcount on the ni when it's
1644 * time to return the credits
1646 lnet_msg_commit(msg, sd->sd_cpt);
1649 * If we are routing the message then we keep the src_nid that was
1650 * set by the originator. If we are not routing then we are the
1651 * originator and set it here.
1653 if (!msg->msg_routing)
1654 msg->msg_hdr.src_nid = cpu_to_le64(msg->msg_txni->ni_nid);
1657 msg->msg_target_is_router = 1;
1658 msg->msg_target.pid = LNET_PID_LUSTRE;
1660 * since we're routing we want to ensure that the
1661 * msg_hdr.dest_nid is set to the final destination. When
1662 * the router receives this message it knows how to route
1665 * final_dst_lpni is set at the beginning of the
1666 * lnet_select_pathway() function and is never changed.
1667 * It's safe to use it here.
1669 msg->msg_hdr.dest_nid = cpu_to_le64(final_dst_lpni->lpni_nid);
1672 * if we're not routing set the dest_nid to the best peer
1673 * ni NID that we picked earlier in the algorithm.
1675 msg->msg_hdr.dest_nid = cpu_to_le64(msg->msg_txpeer->lpni_nid);
1678 rc = lnet_post_send_locked(msg, 0);
1681 CDEBUG(D_NET, "TRACE: %s(%s:%s) -> %s(%s:%s) : %s\n",
1682 libcfs_nid2str(msg->msg_hdr.src_nid),
1683 libcfs_nid2str(msg->msg_txni->ni_nid),
1684 libcfs_nid2str(sd->sd_src_nid),
1685 libcfs_nid2str(msg->msg_hdr.dest_nid),
1686 libcfs_nid2str(sd->sd_dst_nid),
1687 libcfs_nid2str(msg->msg_txpeer->lpni_nid),
1688 lnet_msgtyp2str(msg->msg_type));
1693 static struct lnet_peer_ni *
1694 lnet_select_peer_ni(struct lnet_send_data *sd, struct lnet_peer *peer,
1695 struct lnet_peer_net *peer_net)
1698 * Look at the peer NIs for the destination peer that connect
1699 * to the chosen net. If a peer_ni is preferred when using the
1700 * best_ni to communicate, we use that one. If there is no
1701 * preferred peer_ni, or there are multiple preferred peer_ni,
1702 * the available transmit credits are used. If the transmit
1703 * credits are equal, we round-robin over the peer_ni.
1705 struct lnet_peer_ni *lpni = NULL;
1706 struct lnet_peer_ni *best_lpni = NULL;
1707 struct lnet_ni *best_ni = sd->sd_best_ni;
1708 lnet_nid_t dst_nid = sd->sd_dst_nid;
1709 int best_lpni_credits = INT_MIN;
1710 bool preferred = false;
1713 while ((lpni = lnet_get_next_peer_ni_locked(peer, peer_net, lpni))) {
1715 * if the best_ni we've chosen aleady has this lpni
1716 * preferred, then let's use it
1718 ni_is_pref = lnet_peer_is_pref_nid_locked(lpni,
1721 CDEBUG(D_NET, "%s ni_is_pref = %d\n",
1722 libcfs_nid2str(best_ni->ni_nid), ni_is_pref);
1725 CDEBUG(D_NET, "%s c:[%d, %d], s:[%d, %d]\n",
1726 libcfs_nid2str(lpni->lpni_nid),
1727 lpni->lpni_txcredits, best_lpni_credits,
1728 lpni->lpni_seq, best_lpni->lpni_seq);
1730 /* if this is a preferred peer use it */
1731 if (!preferred && ni_is_pref) {
1733 } else if (preferred && !ni_is_pref) {
1735 * this is not the preferred peer so let's ignore
1739 } else if (lpni->lpni_txcredits < best_lpni_credits) {
1741 * We already have a peer that has more credits
1742 * available than this one. No need to consider
1743 * this peer further.
1746 } else if (lpni->lpni_txcredits == best_lpni_credits) {
1748 * The best peer found so far and the current peer
1749 * have the same number of available credits let's
1750 * make sure to select between them using Round
1754 if (best_lpni->lpni_seq <= lpni->lpni_seq)
1760 best_lpni_credits = lpni->lpni_txcredits;
1763 /* if we still can't find a peer ni then we can't reach it */
1765 __u32 net_id = (peer_net) ? peer_net->lpn_net_id :
1766 LNET_NIDNET(dst_nid);
1767 CDEBUG(D_NET, "no peer_ni found on peer net %s\n",
1768 libcfs_net2str(net_id));
1772 CDEBUG(D_NET, "sd_best_lpni = %s\n",
1773 libcfs_nid2str(best_lpni->lpni_nid));
1779 * Prerequisite: the best_ni should already be set in the sd
1781 static inline struct lnet_peer_ni *
1782 lnet_find_best_lpni_on_net(struct lnet_send_data *sd, struct lnet_peer *peer,
1785 struct lnet_peer_net *peer_net;
1788 * The gateway is Multi-Rail capable so now we must select the
1791 peer_net = lnet_peer_get_net_locked(peer, net_id);
1794 CERROR("gateway peer %s has no NI on net %s\n",
1795 libcfs_nid2str(peer->lp_primary_nid),
1796 libcfs_net2str(net_id));
1800 return lnet_select_peer_ni(sd, peer, peer_net);
1804 lnet_set_non_mr_pref_nid(struct lnet_send_data *sd)
1806 if (sd->sd_send_case & NMR_DST &&
1807 sd->sd_msg->msg_type != LNET_MSG_REPLY &&
1808 sd->sd_msg->msg_type != LNET_MSG_ACK &&
1809 sd->sd_best_lpni->lpni_pref_nnids == 0) {
1810 CDEBUG(D_NET, "Setting preferred local NID %s on NMR peer %s\n",
1811 libcfs_nid2str(sd->sd_best_ni->ni_nid),
1812 libcfs_nid2str(sd->sd_best_lpni->lpni_nid));
1813 lnet_peer_ni_set_non_mr_pref_nid(sd->sd_best_lpni,
1814 sd->sd_best_ni->ni_nid);
1823 * use the source and destination NIDs as the pathway
1826 lnet_handle_spec_local_nmr_dst(struct lnet_send_data *sd)
1828 /* the destination lpni is set before we get here. */
1831 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
1832 if (!sd->sd_best_ni) {
1833 CERROR("Can't send to %s: src %s is not a "
1834 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
1835 libcfs_nid2str(sd->sd_src_nid));
1840 * the preferred NID will only be set for NMR peers
1842 lnet_set_non_mr_pref_nid(sd);
1844 return lnet_handle_send(sd);
1852 * Run the selection algorithm on the peer NIs unless we're sending
1853 * a response, in this case just send to the destination
1856 lnet_handle_spec_local_mr_dst(struct lnet_send_data *sd)
1858 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
1859 if (!sd->sd_best_ni) {
1860 CERROR("Can't send to %s: src %s is not a "
1861 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
1862 libcfs_nid2str(sd->sd_src_nid));
1867 * only run the selection algorithm to pick the peer_ni if we're
1868 * sending a GET or a PUT. Responses are sent to the same
1869 * destination NID provided.
1871 if (!(sd->sd_send_case & SND_RESP)) {
1873 lnet_find_best_lpni_on_net(sd, sd->sd_peer,
1874 sd->sd_best_ni->ni_net->net_id);
1877 if (sd->sd_best_lpni)
1878 return lnet_handle_send(sd);
1880 CERROR("can't send to %s. no NI on %s\n",
1881 libcfs_nid2str(sd->sd_dst_nid),
1882 libcfs_net2str(sd->sd_best_ni->ni_net->net_id));
1884 return -EHOSTUNREACH;
1888 lnet_find_best_ni_on_spec_net(struct lnet_ni *cur_best_ni,
1889 struct lnet_peer *peer,
1890 struct lnet_peer_net *peer_net,
1894 struct lnet_net *local_net;
1895 struct lnet_ni *best_ni;
1897 local_net = lnet_get_net_locked(peer_net->lpn_net_id);
1902 * Iterate through the NIs in this local Net and select
1903 * the NI to send from. The selection is determined by
1904 * these 3 criterion in the following priority:
1906 * 2. NI available credits
1909 best_ni = lnet_get_best_ni(local_net, cur_best_ni,
1910 peer, peer_net, cpt);
1912 if (incr_seq && best_ni)
1919 lnet_handle_find_routed_path(struct lnet_send_data *sd,
1921 struct lnet_peer_ni **gw_lpni,
1922 struct lnet_peer **gw_peer)
1924 struct lnet_peer_ni *gw;
1925 lnet_nid_t src_nid = sd->sd_src_nid;
1927 gw = lnet_find_route_locked(NULL, LNET_NIDNET(dst_nid),
1930 CERROR("no route to %s from %s\n",
1931 libcfs_nid2str(dst_nid), libcfs_nid2str(src_nid));
1932 return -EHOSTUNREACH;
1935 /* get the peer of the gw_ni */
1936 LASSERT(gw->lpni_peer_net);
1937 LASSERT(gw->lpni_peer_net->lpn_peer);
1939 *gw_peer = gw->lpni_peer_net->lpn_peer;
1941 if (!sd->sd_best_ni)
1942 sd->sd_best_ni = lnet_find_best_ni_on_spec_net(NULL, *gw_peer,
1947 if (!sd->sd_best_ni) {
1948 CERROR("Internal Error. Expected local ni on %s "
1949 "but non found :%s\n",
1950 libcfs_net2str(gw->lpni_peer_net->lpn_net_id),
1951 libcfs_nid2str(sd->sd_src_nid));
1956 * if gw is MR let's find its best peer_ni
1958 if (lnet_peer_is_multi_rail(*gw_peer)) {
1959 gw = lnet_find_best_lpni_on_net(sd, *gw_peer,
1960 sd->sd_best_ni->ni_net->net_id);
1962 * We've already verified that the gw has an NI on that
1963 * desired net, but we're not finding it. Something is
1967 CERROR("Internal Error. Route expected to %s from %s\n",
1968 libcfs_nid2str(dst_nid),
1969 libcfs_nid2str(src_nid));
1984 * Remote destination
1985 * Non-MR destination
1989 * Remote destination
1992 * The handling of these two cases is similar. Even though the destination
1993 * can be MR or non-MR, we'll deal directly with the router.
1996 lnet_handle_spec_router_dst(struct lnet_send_data *sd)
1999 struct lnet_peer_ni *gw_lpni = NULL;
2000 struct lnet_peer *gw_peer = NULL;
2003 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
2004 if (!sd->sd_best_ni) {
2005 CERROR("Can't send to %s: src %s is not a "
2006 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
2007 libcfs_nid2str(sd->sd_src_nid));
2011 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2016 if (sd->sd_send_case & NMR_DST)
2018 * since the final destination is non-MR let's set its preferred
2019 * NID before we send
2021 lnet_set_non_mr_pref_nid(sd);
2024 * We're going to send to the gw found so let's set its
2027 sd->sd_peer = gw_peer;
2028 sd->sd_best_lpni = gw_lpni;
2030 return lnet_handle_send(sd);
2034 lnet_find_best_ni_on_local_net(struct lnet_peer *peer, int md_cpt)
2036 struct lnet_peer_net *peer_net = NULL;
2037 struct lnet_ni *best_ni = NULL;
2040 * The peer can have multiple interfaces, some of them can be on
2041 * the local network and others on a routed network. We should
2042 * prefer the local network. However if the local network is not
2043 * available then we need to try the routed network
2046 /* go through all the peer nets and find the best_ni */
2047 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
2049 * The peer's list of nets can contain non-local nets. We
2050 * want to only examine the local ones.
2052 if (!lnet_get_net_locked(peer_net->lpn_net_id))
2054 best_ni = lnet_find_best_ni_on_spec_net(best_ni, peer,
2055 peer_net, md_cpt, false);
2059 /* increment sequence number so we can round robin */
2065 static struct lnet_ni *
2066 lnet_find_existing_preferred_best_ni(struct lnet_send_data *sd)
2068 struct lnet_ni *best_ni = NULL;
2069 struct lnet_peer_net *peer_net;
2070 struct lnet_peer *peer = sd->sd_peer;
2071 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
2072 struct lnet_peer_ni *lpni;
2073 int cpt = sd->sd_cpt;
2076 * We must use a consistent source address when sending to a
2077 * non-MR peer. However, a non-MR peer can have multiple NIDs
2078 * on multiple networks, and we may even need to talk to this
2079 * peer on multiple networks -- certain types of
2080 * load-balancing configuration do this.
2082 * So we need to pick the NI the peer prefers for this
2083 * particular network.
2086 /* Get the target peer_ni */
2087 peer_net = lnet_peer_get_net_locked(peer,
2088 LNET_NIDNET(best_lpni->lpni_nid));
2089 LASSERT(peer_net != NULL);
2090 list_for_each_entry(lpni, &peer_net->lpn_peer_nis,
2092 if (lpni->lpni_pref_nnids == 0)
2094 LASSERT(lpni->lpni_pref_nnids == 1);
2095 best_ni = lnet_nid2ni_locked(
2096 lpni->lpni_pref.nid, cpt);
2103 /* Prerequisite: sd->sd_peer and sd->sd_best_lpni should be set */
2105 lnet_select_preferred_best_ni(struct lnet_send_data *sd)
2107 struct lnet_ni *best_ni = NULL;
2108 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
2111 * We must use a consistent source address when sending to a
2112 * non-MR peer. However, a non-MR peer can have multiple NIDs
2113 * on multiple networks, and we may even need to talk to this
2114 * peer on multiple networks -- certain types of
2115 * load-balancing configuration do this.
2117 * So we need to pick the NI the peer prefers for this
2118 * particular network.
2121 best_ni = lnet_find_existing_preferred_best_ni(sd);
2123 /* if best_ni is still not set just pick one */
2126 lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
2127 sd->sd_best_lpni->lpni_peer_net,
2128 sd->sd_md_cpt, true);
2129 /* If there is no best_ni we don't have a route */
2131 CERROR("no path to %s from net %s\n",
2132 libcfs_nid2str(best_lpni->lpni_nid),
2133 libcfs_net2str(best_lpni->lpni_net->net_id));
2134 return -EHOSTUNREACH;
2138 sd->sd_best_ni = best_ni;
2140 /* Set preferred NI if necessary. */
2141 lnet_set_non_mr_pref_nid(sd);
2148 * Source not specified
2152 * always use the same source NID for NMR peers
2153 * If we've talked to that peer before then we already have a preferred
2154 * source NI associated with it. Otherwise, we select a preferred local NI
2155 * and store it in the peer
2158 lnet_handle_any_local_nmr_dst(struct lnet_send_data *sd)
2162 /* sd->sd_best_lpni is already set to the final destination */
2165 * At this point we should've created the peer ni and peer. If we
2166 * can't find it, then something went wrong. Instead of assert
2167 * output a relevant message and fail the send
2169 if (!sd->sd_best_lpni) {
2170 CERROR("Internal fault. Unable to send msg %s to %s. "
2172 lnet_msgtyp2str(sd->sd_msg->msg_type),
2173 libcfs_nid2str(sd->sd_dst_nid));
2177 rc = lnet_select_preferred_best_ni(sd);
2179 rc = lnet_handle_send(sd);
2185 lnet_handle_any_mr_dsta(struct lnet_send_data *sd)
2188 * NOTE we've already handled the remote peer case. So we only
2189 * need to worry about the local case here.
2191 * if we're sending a response, ACK or reply, we need to send it
2192 * to the destination NID given to us. At this point we already
2193 * have the peer_ni we're suppose to send to, so just find the
2194 * best_ni on the peer net and use that. Since we're sending to an
2195 * MR peer then we can just run the selection algorithm on our
2196 * local NIs and pick the best one.
2198 if (sd->sd_send_case & SND_RESP) {
2200 lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
2201 sd->sd_best_lpni->lpni_peer_net,
2202 sd->sd_md_cpt, true);
2204 if (!sd->sd_best_ni) {
2206 * We're not going to deal with not able to send
2207 * a response to the provided final destination
2209 CERROR("Can't send response to %s. "
2210 "No local NI available\n",
2211 libcfs_nid2str(sd->sd_dst_nid));
2212 return -EHOSTUNREACH;
2215 return lnet_handle_send(sd);
2219 * If we get here that means we're sending a fresh request, PUT or
2220 * GET, so we need to run our standard selection algorithm.
2221 * First find the best local interface that's on any of the peer's
2224 sd->sd_best_ni = lnet_find_best_ni_on_local_net(sd->sd_peer,
2226 if (sd->sd_best_ni) {
2228 lnet_find_best_lpni_on_net(sd, sd->sd_peer,
2229 sd->sd_best_ni->ni_net->net_id);
2232 * if we're successful in selecting a peer_ni on the local
2233 * network, then send to it. Otherwise fall through and
2234 * try and see if we can reach it over another routed
2237 if (sd->sd_best_lpni) {
2239 * in case we initially started with a routed
2240 * destination, let's reset to local
2242 sd->sd_send_case &= ~REMOTE_DST;
2243 sd->sd_send_case |= LOCAL_DST;
2244 return lnet_handle_send(sd);
2247 CERROR("Internal Error. Expected to have a best_lpni: "
2249 libcfs_nid2str(sd->sd_src_nid),
2250 libcfs_nid2str(sd->sd_dst_nid));
2256 * Peer doesn't have a local network. Let's see if there is
2257 * a remote network we can reach it on.
2259 return PASS_THROUGH;
2264 * Source NID not specified
2269 * Source NID not speified
2270 * Remote destination
2273 * In both of these cases if we're sending a response, ACK or REPLY, then
2274 * we need to send to the destination NID provided.
2276 * In the remote case let's deal with MR routers.
2281 lnet_handle_any_mr_dst(struct lnet_send_data *sd)
2284 struct lnet_peer *gw_peer = NULL;
2285 struct lnet_peer_ni *gw_lpni = NULL;
2288 * handle sending a response to a remote peer here so we don't
2289 * have to worry about it if we hit lnet_handle_any_mr_dsta()
2291 if (sd->sd_send_case & REMOTE_DST &&
2292 sd->sd_send_case & SND_RESP) {
2293 struct lnet_peer_ni *gw;
2294 struct lnet_peer *gw_peer;
2296 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw,
2299 CERROR("Can't send response to %s. "
2300 "No route available\n",
2301 libcfs_nid2str(sd->sd_dst_nid));
2302 return -EHOSTUNREACH;
2305 sd->sd_best_lpni = gw;
2306 sd->sd_peer = gw_peer;
2308 return lnet_handle_send(sd);
2312 * Even though the NID for the peer might not be on a local network,
2313 * since the peer is MR there could be other interfaces on the
2314 * local network. In that case we'd still like to prefer the local
2315 * network over the routed network. If we're unable to do that
2316 * then we select the best router among the different routed networks,
2317 * and if the router is MR then we can deal with it as such.
2319 rc = lnet_handle_any_mr_dsta(sd);
2320 if (rc != PASS_THROUGH)
2324 * TODO; One possible enhancement is to run the selection
2325 * algorithm on the peer. However for remote peers the credits are
2326 * not decremented, so we'll be basically going over the peer NIs
2327 * in round robin. An MR router will run the selection algorithm
2328 * on the next-hop interfaces.
2330 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2335 sd->sd_send_case &= ~LOCAL_DST;
2336 sd->sd_send_case |= REMOTE_DST;
2338 sd->sd_peer = gw_peer;
2339 sd->sd_best_lpni = gw_lpni;
2341 return lnet_handle_send(sd);
2345 * Source not specified
2346 * Remote destination
2349 * Must send to the specified peer NID using the same source NID that
2350 * we've used before. If it's the first time to talk to that peer then
2351 * find the source NI and assign it as preferred to that peer
2354 lnet_handle_any_router_nmr_dst(struct lnet_send_data *sd)
2357 struct lnet_peer_ni *gw_lpni = NULL;
2358 struct lnet_peer *gw_peer = NULL;
2361 * Let's set if we have a preferred NI to talk to this NMR peer
2363 sd->sd_best_ni = lnet_find_existing_preferred_best_ni(sd);
2366 * find the router and that'll find the best NI if we didn't find
2369 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2375 * set the best_ni we've chosen as the preferred one for
2378 lnet_set_non_mr_pref_nid(sd);
2380 /* we'll be sending to the gw */
2381 sd->sd_best_lpni = gw_lpni;
2382 sd->sd_peer = gw_peer;
2384 return lnet_handle_send(sd);
2388 lnet_handle_send_case_locked(struct lnet_send_data *sd)
2391 * turn off the SND_RESP bit.
2392 * It will be checked in the case handling
2394 __u32 send_case = sd->sd_send_case &= ~SND_RESP ;
2396 CDEBUG(D_NET, "Source %s%s to %s %s %s destination\n",
2397 (send_case & SRC_SPEC) ? "Specified: " : "ANY",
2398 (send_case & SRC_SPEC) ? libcfs_nid2str(sd->sd_src_nid) : "",
2399 (send_case & MR_DST) ? "MR: " : "NMR: ",
2400 libcfs_nid2str(sd->sd_dst_nid),
2401 (send_case & LOCAL_DST) ? "local" : "routed");
2403 switch (send_case) {
2405 * For all cases where the source is specified, we should always
2406 * use the destination NID, whether it's an MR destination or not,
2407 * since we're continuing a series of related messages for the
2410 case SRC_SPEC_LOCAL_NMR_DST:
2411 return lnet_handle_spec_local_nmr_dst(sd);
2412 case SRC_SPEC_LOCAL_MR_DST:
2413 return lnet_handle_spec_local_mr_dst(sd);
2414 case SRC_SPEC_ROUTER_NMR_DST:
2415 case SRC_SPEC_ROUTER_MR_DST:
2416 return lnet_handle_spec_router_dst(sd);
2417 case SRC_ANY_LOCAL_NMR_DST:
2418 return lnet_handle_any_local_nmr_dst(sd);
2419 case SRC_ANY_LOCAL_MR_DST:
2420 case SRC_ANY_ROUTER_MR_DST:
2421 return lnet_handle_any_mr_dst(sd);
2422 case SRC_ANY_ROUTER_NMR_DST:
2423 return lnet_handle_any_router_nmr_dst(sd);
2425 CERROR("Unknown send case\n");
2431 lnet_select_pathway(lnet_nid_t src_nid, lnet_nid_t dst_nid,
2432 struct lnet_msg *msg, lnet_nid_t rtr_nid)
2434 struct lnet_peer_ni *lpni;
2435 struct lnet_peer *peer;
2436 struct lnet_send_data send_data;
2439 __u32 send_case = 0;
2441 memset(&send_data, 0, sizeof(send_data));
2444 * get an initial CPT to use for locking. The idea here is not to
2445 * serialize the calls to select_pathway, so that as many
2446 * operations can run concurrently as possible. To do that we use
2447 * the CPT where this call is being executed. Later on when we
2448 * determine the CPT to use in lnet_message_commit, we switch the
2449 * lock and check if there was any configuration change. If none,
2450 * then we proceed, if there is, then we restart the operation.
2452 cpt = lnet_net_lock_current();
2454 md_cpt = lnet_cpt_of_md(msg->msg_md, msg->msg_offset);
2455 if (md_cpt == CFS_CPT_ANY)
2461 * If we're being asked to send to the loopback interface, there
2462 * is no need to go through any selection. We can just shortcut
2463 * the entire process and send over lolnd
2465 if (LNET_NETTYP(LNET_NIDNET(dst_nid)) == LOLND) {
2466 /* No send credit hassles with LOLND */
2467 lnet_ni_addref_locked(the_lnet.ln_loni, cpt);
2468 msg->msg_hdr.dest_nid = cpu_to_le64(the_lnet.ln_loni->ni_nid);
2469 if (!msg->msg_routing)
2470 msg->msg_hdr.src_nid =
2471 cpu_to_le64(the_lnet.ln_loni->ni_nid);
2472 msg->msg_target.nid = the_lnet.ln_loni->ni_nid;
2473 lnet_msg_commit(msg, cpt);
2474 msg->msg_txni = the_lnet.ln_loni;
2475 lnet_net_unlock(cpt);
2477 return LNET_CREDIT_OK;
2481 * find an existing peer_ni, or create one and mark it as having been
2482 * created due to network traffic. This call will create the
2483 * peer->peer_net->peer_ni tree.
2485 lpni = lnet_nid2peerni_locked(dst_nid, LNET_NID_ANY, cpt);
2487 lnet_net_unlock(cpt);
2488 return PTR_ERR(lpni);
2492 * Now that we have a peer_ni, check if we want to discover
2493 * the peer. Traffic to the LNET_RESERVED_PORTAL should not
2494 * trigger discovery.
2496 peer = lpni->lpni_peer_net->lpn_peer;
2497 if (lnet_msg_discovery(msg) && !lnet_peer_is_uptodate(peer)) {
2498 lnet_nid_t primary_nid;
2499 rc = lnet_discover_peer_locked(lpni, cpt, false);
2501 lnet_peer_ni_decref_locked(lpni);
2502 lnet_net_unlock(cpt);
2505 /* The peer may have changed. */
2506 peer = lpni->lpni_peer_net->lpn_peer;
2507 /* queue message and return */
2508 msg->msg_src_nid_param = src_nid;
2509 msg->msg_rtr_nid_param = rtr_nid;
2510 msg->msg_sending = 0;
2511 list_add_tail(&msg->msg_list, &peer->lp_dc_pendq);
2512 lnet_peer_ni_decref_locked(lpni);
2513 primary_nid = peer->lp_primary_nid;
2514 lnet_net_unlock(cpt);
2516 CDEBUG(D_NET, "%s pending discovery\n",
2517 libcfs_nid2str(primary_nid));
2519 return LNET_DC_WAIT;
2521 lnet_peer_ni_decref_locked(lpni);
2523 /* If peer is not healthy then can not send anything to it */
2524 if (!lnet_is_peer_healthy_locked(peer)) {
2525 lnet_net_unlock(cpt);
2526 return -EHOSTUNREACH;
2530 * Identify the different send cases
2532 if (src_nid == LNET_NID_ANY)
2533 send_case |= SRC_ANY;
2535 send_case |= SRC_SPEC;
2537 if (lnet_get_net_locked(LNET_NIDNET(dst_nid)))
2538 send_case |= LOCAL_DST;
2540 send_case |= REMOTE_DST;
2542 if (!lnet_peer_is_multi_rail(peer))
2543 send_case |= NMR_DST;
2545 send_case |= MR_DST;
2547 if (msg->msg_type == LNET_MSG_REPLY ||
2548 msg->msg_type == LNET_MSG_ACK)
2549 send_case |= SND_RESP;
2551 /* assign parameters to the send_data */
2552 send_data.sd_msg = msg;
2553 send_data.sd_rtr_nid = rtr_nid;
2554 send_data.sd_src_nid = src_nid;
2555 send_data.sd_dst_nid = dst_nid;
2556 send_data.sd_best_lpni = lpni;
2558 * keep a pointer to the final destination in case we're going to
2559 * route, so we'll need to access it later
2561 send_data.sd_final_dst_lpni = lpni;
2562 send_data.sd_peer = peer;
2563 send_data.sd_md_cpt = md_cpt;
2564 send_data.sd_cpt = cpt;
2565 send_data.sd_send_case = send_case;
2567 rc = lnet_handle_send_case_locked(&send_data);
2569 if (rc == REPEAT_SEND)
2572 lnet_net_unlock(send_data.sd_cpt);
2578 lnet_send(lnet_nid_t src_nid, struct lnet_msg *msg, lnet_nid_t rtr_nid)
2580 lnet_nid_t dst_nid = msg->msg_target.nid;
2584 * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
2585 * but we might want to use pre-determined router for ACK/REPLY
2588 /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
2589 LASSERT (msg->msg_txpeer == NULL);
2590 LASSERT (!msg->msg_sending);
2591 LASSERT (!msg->msg_target_is_router);
2592 LASSERT (!msg->msg_receiving);
2594 msg->msg_sending = 1;
2596 LASSERT(!msg->msg_tx_committed);
2598 rc = lnet_select_pathway(src_nid, dst_nid, msg, rtr_nid);
2602 if (rc == LNET_CREDIT_OK)
2603 lnet_ni_send(msg->msg_txni, msg);
2605 /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT or LNET_DC_WAIT */
2610 lnet_drop_message(struct lnet_ni *ni, int cpt, void *private, unsigned int nob,
2614 lnet_incr_stats(&ni->ni_stats, msg_type, LNET_STATS_TYPE_DROP);
2615 the_lnet.ln_counters[cpt]->drop_count++;
2616 the_lnet.ln_counters[cpt]->drop_length += nob;
2617 lnet_net_unlock(cpt);
2619 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
2623 lnet_recv_put(struct lnet_ni *ni, struct lnet_msg *msg)
2625 struct lnet_hdr *hdr = &msg->msg_hdr;
2627 if (msg->msg_wanted != 0)
2628 lnet_setpayloadbuffer(msg);
2630 lnet_build_msg_event(msg, LNET_EVENT_PUT);
2632 /* Must I ACK? If so I'll grab the ack_wmd out of the header and put
2633 * it back into the ACK during lnet_finalize() */
2634 msg->msg_ack = (!lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
2635 (msg->msg_md->md_options & LNET_MD_ACK_DISABLE) == 0);
2637 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
2638 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
2642 lnet_parse_put(struct lnet_ni *ni, struct lnet_msg *msg)
2644 struct lnet_hdr *hdr = &msg->msg_hdr;
2645 struct lnet_match_info info;
2649 /* Convert put fields to host byte order */
2650 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
2651 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
2652 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
2654 /* Primary peer NID. */
2655 info.mi_id.nid = msg->msg_initiator;
2656 info.mi_id.pid = hdr->src_pid;
2657 info.mi_opc = LNET_MD_OP_PUT;
2658 info.mi_portal = hdr->msg.put.ptl_index;
2659 info.mi_rlength = hdr->payload_length;
2660 info.mi_roffset = hdr->msg.put.offset;
2661 info.mi_mbits = hdr->msg.put.match_bits;
2662 info.mi_cpt = lnet_cpt_of_nid(msg->msg_rxpeer->lpni_nid, ni);
2664 msg->msg_rx_ready_delay = ni->ni_net->net_lnd->lnd_eager_recv == NULL;
2665 ready_delay = msg->msg_rx_ready_delay;
2668 rc = lnet_ptl_match_md(&info, msg);
2673 case LNET_MATCHMD_OK:
2674 lnet_recv_put(ni, msg);
2677 case LNET_MATCHMD_NONE:
2679 /* no eager_recv or has already called it, should
2680 * have been attached on delayed list */
2683 rc = lnet_ni_eager_recv(ni, msg);
2690 case LNET_MATCHMD_DROP:
2691 CNETERR("Dropping PUT from %s portal %d match %llu"
2692 " offset %d length %d: %d\n",
2693 libcfs_id2str(info.mi_id), info.mi_portal,
2694 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
2696 return -ENOENT; /* -ve: OK but no match */
2701 lnet_parse_get(struct lnet_ni *ni, struct lnet_msg *msg, int rdma_get)
2703 struct lnet_match_info info;
2704 struct lnet_hdr *hdr = &msg->msg_hdr;
2705 struct lnet_process_id source_id;
2706 struct lnet_handle_wire reply_wmd;
2709 /* Convert get fields to host byte order */
2710 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
2711 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
2712 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
2713 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
2715 source_id.nid = hdr->src_nid;
2716 source_id.pid = hdr->src_pid;
2717 /* Primary peer NID */
2718 info.mi_id.nid = msg->msg_initiator;
2719 info.mi_id.pid = hdr->src_pid;
2720 info.mi_opc = LNET_MD_OP_GET;
2721 info.mi_portal = hdr->msg.get.ptl_index;
2722 info.mi_rlength = hdr->msg.get.sink_length;
2723 info.mi_roffset = hdr->msg.get.src_offset;
2724 info.mi_mbits = hdr->msg.get.match_bits;
2725 info.mi_cpt = lnet_cpt_of_nid(msg->msg_rxpeer->lpni_nid, ni);
2727 rc = lnet_ptl_match_md(&info, msg);
2728 if (rc == LNET_MATCHMD_DROP) {
2729 CNETERR("Dropping GET from %s portal %d match %llu"
2730 " offset %d length %d\n",
2731 libcfs_id2str(info.mi_id), info.mi_portal,
2732 info.mi_mbits, info.mi_roffset, info.mi_rlength);
2733 return -ENOENT; /* -ve: OK but no match */
2736 LASSERT(rc == LNET_MATCHMD_OK);
2738 lnet_build_msg_event(msg, LNET_EVENT_GET);
2740 reply_wmd = hdr->msg.get.return_wmd;
2742 lnet_prep_send(msg, LNET_MSG_REPLY, source_id,
2743 msg->msg_offset, msg->msg_wanted);
2745 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
2748 /* The LND completes the REPLY from her recv procedure */
2749 lnet_ni_recv(ni, msg->msg_private, msg, 0,
2750 msg->msg_offset, msg->msg_len, msg->msg_len);
2754 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
2755 msg->msg_receiving = 0;
2757 rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
2759 /* didn't get as far as lnet_ni_send() */
2760 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
2761 libcfs_nid2str(ni->ni_nid),
2762 libcfs_id2str(info.mi_id), rc);
2764 lnet_finalize(msg, rc);
2771 lnet_parse_reply(struct lnet_ni *ni, struct lnet_msg *msg)
2773 void *private = msg->msg_private;
2774 struct lnet_hdr *hdr = &msg->msg_hdr;
2775 struct lnet_process_id src = {0};
2776 struct lnet_libmd *md;
2781 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
2784 src.nid = hdr->src_nid;
2785 src.pid = hdr->src_pid;
2787 /* NB handles only looked up by creator (no flips) */
2788 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
2789 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2790 CNETERR("%s: Dropping REPLY from %s for %s "
2792 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2793 (md == NULL) ? "invalid" : "inactive",
2794 hdr->msg.reply.dst_wmd.wh_interface_cookie,
2795 hdr->msg.reply.dst_wmd.wh_object_cookie);
2796 if (md != NULL && md->md_me != NULL)
2797 CERROR("REPLY MD also attached to portal %d\n",
2798 md->md_me->me_portal);
2800 lnet_res_unlock(cpt);
2801 return -ENOENT; /* -ve: OK but no match */
2804 LASSERT(md->md_offset == 0);
2806 rlength = hdr->payload_length;
2807 mlength = MIN(rlength, (int)md->md_length);
2809 if (mlength < rlength &&
2810 (md->md_options & LNET_MD_TRUNCATE) == 0) {
2811 CNETERR("%s: Dropping REPLY from %s length %d "
2812 "for MD %#llx would overflow (%d)\n",
2813 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2814 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
2816 lnet_res_unlock(cpt);
2817 return -ENOENT; /* -ve: OK but no match */
2820 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n",
2821 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2822 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
2824 lnet_msg_attach_md(msg, md, 0, mlength);
2827 lnet_setpayloadbuffer(msg);
2829 lnet_res_unlock(cpt);
2831 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
2833 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
2838 lnet_parse_ack(struct lnet_ni *ni, struct lnet_msg *msg)
2840 struct lnet_hdr *hdr = &msg->msg_hdr;
2841 struct lnet_process_id src = {0};
2842 struct lnet_libmd *md;
2845 src.nid = hdr->src_nid;
2846 src.pid = hdr->src_pid;
2848 /* Convert ack fields to host byte order */
2849 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
2850 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
2852 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
2855 /* NB handles only looked up by creator (no flips) */
2856 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
2857 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
2858 /* Don't moan; this is expected */
2860 "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n",
2861 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2862 (md == NULL) ? "invalid" : "inactive",
2863 hdr->msg.ack.dst_wmd.wh_interface_cookie,
2864 hdr->msg.ack.dst_wmd.wh_object_cookie);
2865 if (md != NULL && md->md_me != NULL)
2866 CERROR("Source MD also attached to portal %d\n",
2867 md->md_me->me_portal);
2869 lnet_res_unlock(cpt);
2870 return -ENOENT; /* -ve! */
2873 CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n",
2874 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
2875 hdr->msg.ack.dst_wmd.wh_object_cookie);
2877 lnet_msg_attach_md(msg, md, 0, 0);
2879 lnet_res_unlock(cpt);
2881 lnet_build_msg_event(msg, LNET_EVENT_ACK);
2883 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
2888 * \retval LNET_CREDIT_OK If \a msg is forwarded
2889 * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
2890 * \retval -ve error code
2893 lnet_parse_forward_locked(struct lnet_ni *ni, struct lnet_msg *msg)
2897 if (!the_lnet.ln_routing)
2900 if (msg->msg_rxpeer->lpni_rtrcredits <= 0 ||
2901 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
2902 if (ni->ni_net->net_lnd->lnd_eager_recv == NULL) {
2903 msg->msg_rx_ready_delay = 1;
2905 lnet_net_unlock(msg->msg_rx_cpt);
2906 rc = lnet_ni_eager_recv(ni, msg);
2907 lnet_net_lock(msg->msg_rx_cpt);
2912 rc = lnet_post_routed_recv_locked(msg, 0);
2917 lnet_parse_local(struct lnet_ni *ni, struct lnet_msg *msg)
2921 switch (msg->msg_type) {
2923 rc = lnet_parse_ack(ni, msg);
2926 rc = lnet_parse_put(ni, msg);
2929 rc = lnet_parse_get(ni, msg, msg->msg_rdma_get);
2931 case LNET_MSG_REPLY:
2932 rc = lnet_parse_reply(ni, msg);
2934 default: /* prevent an unused label if !kernel */
2939 LASSERT(rc == 0 || rc == -ENOENT);
2944 lnet_msgtyp2str (int type)
2953 case LNET_MSG_REPLY:
2955 case LNET_MSG_HELLO:
2958 return ("<UNKNOWN>");
2963 lnet_print_hdr(struct lnet_hdr *hdr)
2965 struct lnet_process_id src = {
2966 .nid = hdr->src_nid,
2967 .pid = hdr->src_pid,
2969 struct lnet_process_id dst = {
2970 .nid = hdr->dest_nid,
2971 .pid = hdr->dest_pid,
2973 char *type_str = lnet_msgtyp2str(hdr->type);
2975 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
2976 CWARN(" From %s\n", libcfs_id2str(src));
2977 CWARN(" To %s\n", libcfs_id2str(dst));
2979 switch (hdr->type) {
2984 CWARN(" Ptl index %d, ack md %#llx.%#llx, "
2985 "match bits %llu\n",
2986 hdr->msg.put.ptl_index,
2987 hdr->msg.put.ack_wmd.wh_interface_cookie,
2988 hdr->msg.put.ack_wmd.wh_object_cookie,
2989 hdr->msg.put.match_bits);
2990 CWARN(" Length %d, offset %d, hdr data %#llx\n",
2991 hdr->payload_length, hdr->msg.put.offset,
2992 hdr->msg.put.hdr_data);
2996 CWARN(" Ptl index %d, return md %#llx.%#llx, "
2997 "match bits %llu\n", hdr->msg.get.ptl_index,
2998 hdr->msg.get.return_wmd.wh_interface_cookie,
2999 hdr->msg.get.return_wmd.wh_object_cookie,
3000 hdr->msg.get.match_bits);
3001 CWARN(" Length %d, src offset %d\n",
3002 hdr->msg.get.sink_length,
3003 hdr->msg.get.src_offset);
3007 CWARN(" dst md %#llx.%#llx, "
3008 "manipulated length %d\n",
3009 hdr->msg.ack.dst_wmd.wh_interface_cookie,
3010 hdr->msg.ack.dst_wmd.wh_object_cookie,
3011 hdr->msg.ack.mlength);
3014 case LNET_MSG_REPLY:
3015 CWARN(" dst md %#llx.%#llx, "
3017 hdr->msg.reply.dst_wmd.wh_interface_cookie,
3018 hdr->msg.reply.dst_wmd.wh_object_cookie,
3019 hdr->payload_length);
3025 lnet_parse(struct lnet_ni *ni, struct lnet_hdr *hdr, lnet_nid_t from_nid,
3026 void *private, int rdma_req)
3031 struct lnet_msg *msg;
3032 lnet_pid_t dest_pid;
3033 lnet_nid_t dest_nid;
3035 struct lnet_peer_ni *lpni;
3036 __u32 payload_length;
3039 LASSERT (!in_interrupt ());
3041 type = le32_to_cpu(hdr->type);
3042 src_nid = le64_to_cpu(hdr->src_nid);
3043 dest_nid = le64_to_cpu(hdr->dest_nid);
3044 dest_pid = le32_to_cpu(hdr->dest_pid);
3045 payload_length = le32_to_cpu(hdr->payload_length);
3047 for_me = (ni->ni_nid == dest_nid);
3048 cpt = lnet_cpt_of_nid(from_nid, ni);
3050 CDEBUG(D_NET, "TRACE: %s(%s) <- %s : %s - %s\n",
3051 libcfs_nid2str(dest_nid),
3052 libcfs_nid2str(ni->ni_nid),
3053 libcfs_nid2str(src_nid),
3054 lnet_msgtyp2str(type),
3055 (for_me) ? "for me" : "routed");
3060 if (payload_length > 0) {
3061 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
3062 libcfs_nid2str(from_nid),
3063 libcfs_nid2str(src_nid),
3064 lnet_msgtyp2str(type), payload_length);
3070 case LNET_MSG_REPLY:
3071 if (payload_length >
3072 (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
3073 CERROR("%s, src %s: bad %s payload %d "
3074 "(%d max expected)\n",
3075 libcfs_nid2str(from_nid),
3076 libcfs_nid2str(src_nid),
3077 lnet_msgtyp2str(type),
3079 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
3085 CERROR("%s, src %s: Bad message type 0x%x\n",
3086 libcfs_nid2str(from_nid),
3087 libcfs_nid2str(src_nid), type);
3091 if (the_lnet.ln_routing &&
3092 ni->ni_last_alive != ktime_get_real_seconds()) {
3093 /* NB: so far here is the only place to set NI status to "up */
3095 ni->ni_last_alive = ktime_get_real_seconds();
3096 if (ni->ni_status != NULL &&
3097 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
3098 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
3102 /* Regard a bad destination NID as a protocol error. Senders should
3103 * know what they're doing; if they don't they're misconfigured, buggy
3104 * or malicious so we chop them off at the knees :) */
3107 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
3108 /* should have gone direct */
3109 CERROR("%s, src %s: Bad dest nid %s "
3110 "(should have been sent direct)\n",
3111 libcfs_nid2str(from_nid),
3112 libcfs_nid2str(src_nid),
3113 libcfs_nid2str(dest_nid));
3117 if (lnet_islocalnid(dest_nid)) {
3118 /* dest is another local NI; sender should have used
3119 * this node's NID on its own network */
3120 CERROR("%s, src %s: Bad dest nid %s "
3121 "(it's my nid but on a different network)\n",
3122 libcfs_nid2str(from_nid),
3123 libcfs_nid2str(src_nid),
3124 libcfs_nid2str(dest_nid));
3128 if (rdma_req && type == LNET_MSG_GET) {
3129 CERROR("%s, src %s: Bad optimized GET for %s "
3130 "(final destination must be me)\n",
3131 libcfs_nid2str(from_nid),
3132 libcfs_nid2str(src_nid),
3133 libcfs_nid2str(dest_nid));
3137 if (!the_lnet.ln_routing) {
3138 CERROR("%s, src %s: Dropping message for %s "
3139 "(routing not enabled)\n",
3140 libcfs_nid2str(from_nid),
3141 libcfs_nid2str(src_nid),
3142 libcfs_nid2str(dest_nid));
3147 /* Message looks OK; we're not going to return an error, so we MUST
3148 * call back lnd_recv() come what may... */
3150 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
3151 fail_peer(src_nid, 0)) { /* shall we now? */
3152 CERROR("%s, src %s: Dropping %s to simulate failure\n",
3153 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
3154 lnet_msgtyp2str(type));
3158 if (!list_empty(&the_lnet.ln_drop_rules) &&
3159 lnet_drop_rule_match(hdr)) {
3160 CDEBUG(D_NET, "%s, src %s, dst %s: Dropping %s to simulate"
3161 "silent message loss\n",
3162 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
3163 libcfs_nid2str(dest_nid), lnet_msgtyp2str(type));
3168 msg = lnet_msg_alloc();
3170 CERROR("%s, src %s: Dropping %s (out of memory)\n",
3171 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
3172 lnet_msgtyp2str(type));
3176 /* msg zeroed in lnet_msg_alloc; i.e. flags all clear,
3177 * pointers NULL etc */
3179 msg->msg_type = type;
3180 msg->msg_private = private;
3181 msg->msg_receiving = 1;
3182 msg->msg_rdma_get = rdma_req;
3183 msg->msg_len = msg->msg_wanted = payload_length;
3184 msg->msg_offset = 0;
3185 msg->msg_hdr = *hdr;
3186 /* for building message event */
3187 msg->msg_from = from_nid;
3189 msg->msg_target.pid = dest_pid;
3190 msg->msg_target.nid = dest_nid;
3191 msg->msg_routing = 1;
3194 /* convert common msg->hdr fields to host byteorder */
3195 msg->msg_hdr.type = type;
3196 msg->msg_hdr.src_nid = src_nid;
3197 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
3198 msg->msg_hdr.dest_nid = dest_nid;
3199 msg->msg_hdr.dest_pid = dest_pid;
3200 msg->msg_hdr.payload_length = payload_length;
3204 lpni = lnet_nid2peerni_locked(from_nid, ni->ni_nid, cpt);
3206 lnet_net_unlock(cpt);
3207 CERROR("%s, src %s: Dropping %s "
3208 "(error %ld looking up sender)\n",
3209 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
3210 lnet_msgtyp2str(type), PTR_ERR(lpni));
3212 if (rc == -ESHUTDOWN)
3213 /* We are shutting down. Don't do anything more */
3217 msg->msg_rxpeer = lpni;
3219 lnet_ni_addref_locked(ni, cpt);
3220 /* Multi-Rail: Primary NID of source. */
3221 msg->msg_initiator = lnet_peer_primary_nid_locked(src_nid);
3223 if (lnet_isrouter(msg->msg_rxpeer)) {
3224 lnet_peer_set_alive(msg->msg_rxpeer);
3225 if (avoid_asym_router_failure &&
3226 LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
3227 /* received a remote message from router, update
3228 * remote NI status on this router.
3229 * NB: multi-hop routed message will be ignored.
3231 lnet_router_ni_update_locked(msg->msg_rxpeer,
3232 LNET_NIDNET(src_nid));
3236 lnet_msg_commit(msg, cpt);
3238 /* message delay simulation */
3239 if (unlikely(!list_empty(&the_lnet.ln_delay_rules) &&
3240 lnet_delay_rule_match_locked(hdr, msg))) {
3241 lnet_net_unlock(cpt);
3246 rc = lnet_parse_forward_locked(ni, msg);
3247 lnet_net_unlock(cpt);
3252 if (rc == LNET_CREDIT_OK) {
3253 lnet_ni_recv(ni, msg->msg_private, msg, 0,
3254 0, payload_length, payload_length);
3259 lnet_net_unlock(cpt);
3261 rc = lnet_parse_local(ni, msg);
3267 LASSERT(msg->msg_md == NULL);
3268 lnet_finalize(msg, rc);
3271 lnet_drop_message(ni, cpt, private, payload_length, type);
3274 EXPORT_SYMBOL(lnet_parse);
3277 lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
3279 while (!list_empty(head)) {
3280 struct lnet_process_id id = {0};
3281 struct lnet_msg *msg;
3283 msg = list_entry(head->next, struct lnet_msg, msg_list);
3284 list_del(&msg->msg_list);
3286 id.nid = msg->msg_hdr.src_nid;
3287 id.pid = msg->msg_hdr.src_pid;
3289 LASSERT(msg->msg_md == NULL);
3290 LASSERT(msg->msg_rx_delayed);
3291 LASSERT(msg->msg_rxpeer != NULL);
3292 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
3294 CWARN("Dropping delayed PUT from %s portal %d match %llu"
3295 " offset %d length %d: %s\n",
3297 msg->msg_hdr.msg.put.ptl_index,
3298 msg->msg_hdr.msg.put.match_bits,
3299 msg->msg_hdr.msg.put.offset,
3300 msg->msg_hdr.payload_length, reason);
3302 /* NB I can't drop msg's ref on msg_rxpeer until after I've
3303 * called lnet_drop_message(), so I just hang onto msg as well
3304 * until that's done */
3306 lnet_drop_message(msg->msg_rxni, msg->msg_rx_cpt,
3307 msg->msg_private, msg->msg_len,
3310 * NB: message will not generate event because w/o attached MD,
3311 * but we still should give error code so lnet_msg_decommit()
3312 * can skip counters operations and other checks.
3314 lnet_finalize(msg, -ENOENT);
3319 lnet_recv_delayed_msg_list(struct list_head *head)
3321 while (!list_empty(head)) {
3322 struct lnet_msg *msg;
3323 struct lnet_process_id id;
3325 msg = list_entry(head->next, struct lnet_msg, msg_list);
3326 list_del(&msg->msg_list);
3328 /* md won't disappear under me, since each msg
3329 * holds a ref on it */
3331 id.nid = msg->msg_hdr.src_nid;
3332 id.pid = msg->msg_hdr.src_pid;
3334 LASSERT(msg->msg_rx_delayed);
3335 LASSERT(msg->msg_md != NULL);
3336 LASSERT(msg->msg_rxpeer != NULL);
3337 LASSERT(msg->msg_rxni != NULL);
3338 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
3340 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
3341 "match %llu offset %d length %d.\n",
3342 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
3343 msg->msg_hdr.msg.put.match_bits,
3344 msg->msg_hdr.msg.put.offset,
3345 msg->msg_hdr.payload_length);
3347 lnet_recv_put(msg->msg_rxni, msg);
3352 * Initiate an asynchronous PUT operation.
3354 * There are several events associated with a PUT: completion of the send on
3355 * the initiator node (LNET_EVENT_SEND), and when the send completes
3356 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
3357 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
3358 * used at the target node to indicate the completion of incoming data
3361 * The local events will be logged in the EQ associated with the MD pointed to
3362 * by \a mdh handle. Using a MD without an associated EQ results in these
3363 * events being discarded. In this case, the caller must have another
3364 * mechanism (e.g., a higher level protocol) for determining when it is safe
3365 * to modify the memory region associated with the MD.
3367 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
3368 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
3370 * \param self Indicates the NID of a local interface through which to send
3371 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
3372 * \param mdh A handle for the MD that describes the memory to be sent. The MD
3373 * must be "free floating" (See LNetMDBind()).
3374 * \param ack Controls whether an acknowledgment is requested.
3375 * Acknowledgments are only sent when they are requested by the initiating
3376 * process and the target MD enables them.
3377 * \param target A process identifier for the target process.
3378 * \param portal The index in the \a target's portal table.
3379 * \param match_bits The match bits to use for MD selection at the target
3381 * \param offset The offset into the target MD (only used when the target
3382 * MD has the LNET_MD_MANAGE_REMOTE option set).
3383 * \param hdr_data 64 bits of user data that can be included in the message
3384 * header. This data is written to an event queue entry at the target if an
3385 * EQ is present on the matching MD.
3387 * \retval 0 Success, and only in this case events will be generated
3388 * and logged to EQ (if it exists).
3389 * \retval -EIO Simulated failure.
3390 * \retval -ENOMEM Memory allocation failure.
3391 * \retval -ENOENT Invalid MD object.
3393 * \see struct lnet_event::hdr_data and lnet_event_kind_t.
3396 LNetPut(lnet_nid_t self, struct lnet_handle_md mdh, enum lnet_ack_req ack,
3397 struct lnet_process_id target, unsigned int portal,
3398 __u64 match_bits, unsigned int offset,
3401 struct lnet_msg *msg;
3402 struct lnet_libmd *md;
3406 LASSERT(the_lnet.ln_refcount > 0);
3408 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
3409 fail_peer(target.nid, 1)) { /* shall we now? */
3410 CERROR("Dropping PUT to %s: simulated failure\n",
3411 libcfs_id2str(target));
3415 msg = lnet_msg_alloc();
3417 CERROR("Dropping PUT to %s: ENOMEM on struct lnet_msg\n",
3418 libcfs_id2str(target));
3421 msg->msg_vmflush = !!memory_pressure_get();
3423 cpt = lnet_cpt_of_cookie(mdh.cookie);
3426 md = lnet_handle2md(&mdh);
3427 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
3428 CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n",
3429 match_bits, portal, libcfs_id2str(target),
3430 md == NULL ? -1 : md->md_threshold);
3431 if (md != NULL && md->md_me != NULL)
3432 CERROR("Source MD also attached to portal %d\n",
3433 md->md_me->me_portal);
3434 lnet_res_unlock(cpt);
3440 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
3442 lnet_msg_attach_md(msg, md, 0, 0);
3444 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
3446 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
3447 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
3448 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
3449 msg->msg_hdr.msg.put.hdr_data = hdr_data;
3451 /* NB handles only looked up by creator (no flips) */
3452 if (ack == LNET_ACK_REQ) {
3453 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
3454 the_lnet.ln_interface_cookie;
3455 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
3456 md->md_lh.lh_cookie;
3458 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
3459 LNET_WIRE_HANDLE_COOKIE_NONE;
3460 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
3461 LNET_WIRE_HANDLE_COOKIE_NONE;
3464 lnet_res_unlock(cpt);
3466 lnet_build_msg_event(msg, LNET_EVENT_SEND);
3468 rc = lnet_send(self, msg, LNET_NID_ANY);
3470 CNETERR("Error sending PUT to %s: %d\n",
3471 libcfs_id2str(target), rc);
3472 lnet_finalize(msg, rc);
3475 /* completion will be signalled by an event */
3478 EXPORT_SYMBOL(LNetPut);
3481 * The LND can DMA direct to the GET md (i.e. no REPLY msg). This
3482 * returns a msg for the LND to pass to lnet_finalize() when the sink
3483 * data has been received.
3485 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
3486 * lnet_finalize() is called on it, so the LND must call this first
3489 lnet_create_reply_msg(struct lnet_ni *ni, struct lnet_msg *getmsg)
3491 struct lnet_msg *msg = lnet_msg_alloc();
3492 struct lnet_libmd *getmd = getmsg->msg_md;
3493 struct lnet_process_id peer_id = getmsg->msg_target;
3496 LASSERT(!getmsg->msg_target_is_router);
3497 LASSERT(!getmsg->msg_routing);
3500 CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
3501 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
3505 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
3508 LASSERT(getmd->md_refcount > 0);
3510 if (getmd->md_threshold == 0) {
3511 CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
3512 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
3514 lnet_res_unlock(cpt);
3518 LASSERT(getmd->md_offset == 0);
3520 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
3521 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
3523 /* setup information for lnet_build_msg_event */
3524 msg->msg_initiator = getmsg->msg_txpeer->lpni_peer_net->lpn_peer->lp_primary_nid;
3525 msg->msg_from = peer_id.nid;
3526 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
3527 msg->msg_hdr.src_nid = peer_id.nid;
3528 msg->msg_hdr.payload_length = getmd->md_length;
3529 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
3531 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
3532 lnet_res_unlock(cpt);
3534 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
3537 lnet_msg_commit(msg, cpt);
3538 lnet_net_unlock(cpt);
3540 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
3545 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
3548 lnet_incr_stats(&ni->ni_stats, LNET_MSG_GET, LNET_STATS_TYPE_DROP);
3549 the_lnet.ln_counters[cpt]->drop_count++;
3550 the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
3551 lnet_net_unlock(cpt);
3558 EXPORT_SYMBOL(lnet_create_reply_msg);
3561 lnet_set_reply_msg_len(struct lnet_ni *ni, struct lnet_msg *reply,
3564 /* Set the REPLY length, now the RDMA that elides the REPLY message has
3565 * completed and I know it. */
3566 LASSERT(reply != NULL);
3567 LASSERT(reply->msg_type == LNET_MSG_GET);
3568 LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
3570 /* NB I trusted my peer to RDMA. If she tells me she's written beyond
3571 * the end of my buffer, I might as well be dead. */
3572 LASSERT(len <= reply->msg_ev.mlength);
3574 reply->msg_ev.mlength = len;
3576 EXPORT_SYMBOL(lnet_set_reply_msg_len);
3579 * Initiate an asynchronous GET operation.
3581 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
3582 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
3583 * the target node in the REPLY has been written to local MD.
3585 * On the target node, an LNET_EVENT_GET is logged when the GET request
3586 * arrives and is accepted into a MD.
3588 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
3589 * \param mdh A handle for the MD that describes the memory into which the
3590 * requested data will be received. The MD must be "free floating" (See LNetMDBind()).
3592 * \retval 0 Success, and only in this case events will be generated
3593 * and logged to EQ (if it exists) of the MD.
3594 * \retval -EIO Simulated failure.
3595 * \retval -ENOMEM Memory allocation failure.
3596 * \retval -ENOENT Invalid MD object.
3599 LNetGet(lnet_nid_t self, struct lnet_handle_md mdh,
3600 struct lnet_process_id target, unsigned int portal,
3601 __u64 match_bits, unsigned int offset)
3603 struct lnet_msg *msg;
3604 struct lnet_libmd *md;
3608 LASSERT(the_lnet.ln_refcount > 0);
3610 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
3611 fail_peer(target.nid, 1)) /* shall we now? */
3613 CERROR("Dropping GET to %s: simulated failure\n",
3614 libcfs_id2str(target));
3618 msg = lnet_msg_alloc();
3620 CERROR("Dropping GET to %s: ENOMEM on struct lnet_msg\n",
3621 libcfs_id2str(target));
3625 cpt = lnet_cpt_of_cookie(mdh.cookie);
3628 md = lnet_handle2md(&mdh);
3629 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
3630 CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n",
3631 match_bits, portal, libcfs_id2str(target),
3632 md == NULL ? -1 : md->md_threshold);
3633 if (md != NULL && md->md_me != NULL)
3634 CERROR("REPLY MD also attached to portal %d\n",
3635 md->md_me->me_portal);
3637 lnet_res_unlock(cpt);
3643 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
3645 lnet_msg_attach_md(msg, md, 0, 0);
3647 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
3649 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
3650 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
3651 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
3652 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
3654 /* NB handles only looked up by creator (no flips) */
3655 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
3656 the_lnet.ln_interface_cookie;
3657 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
3658 md->md_lh.lh_cookie;
3660 lnet_res_unlock(cpt);
3662 lnet_build_msg_event(msg, LNET_EVENT_SEND);
3664 rc = lnet_send(self, msg, LNET_NID_ANY);
3666 CNETERR("Error sending GET to %s: %d\n",
3667 libcfs_id2str(target), rc);
3668 lnet_finalize(msg, rc);
3671 /* completion will be signalled by an event */
3674 EXPORT_SYMBOL(LNetGet);
3677 * Calculate distance to node at \a dstnid.
3679 * \param dstnid Target NID.
3680 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
3682 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
3685 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
3686 * local_nid_dist_zero is set, which is the default.
3687 * \retval positives Distance to target NID, i.e. number of hops plus one.
3688 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
3691 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
3693 struct list_head *e;
3694 struct lnet_ni *ni = NULL;
3695 struct lnet_remotenet *rnet;
3696 __u32 dstnet = LNET_NIDNET(dstnid);
3700 struct list_head *rn_list;
3702 /* if !local_nid_dist_zero, I don't return a distance of 0 ever
3703 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
3704 * keep order 0 free for 0@lo and order 1 free for a local NID
3707 LASSERT(the_lnet.ln_refcount > 0);
3709 cpt = lnet_net_lock_current();
3711 while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
3712 if (ni->ni_nid == dstnid) {
3713 if (srcnidp != NULL)
3715 if (orderp != NULL) {
3716 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
3721 lnet_net_unlock(cpt);
3723 return local_nid_dist_zero ? 0 : 1;
3726 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
3727 /* Check if ni was originally created in
3728 * current net namespace.
3729 * If not, assign order above 0xffff0000,
3730 * to make this ni not a priority. */
3731 if (!net_eq(ni->ni_net_ns, current->nsproxy->net_ns))
3732 order += 0xffff0000;
3734 if (srcnidp != NULL)
3735 *srcnidp = ni->ni_nid;
3738 lnet_net_unlock(cpt);
3745 rn_list = lnet_net2rnethash(dstnet);
3746 list_for_each(e, rn_list) {
3747 rnet = list_entry(e, struct lnet_remotenet, lrn_list);
3749 if (rnet->lrn_net == dstnet) {
3750 struct lnet_route *route;
3751 struct lnet_route *shortest = NULL;
3752 __u32 shortest_hops = LNET_UNDEFINED_HOPS;
3755 LASSERT(!list_empty(&rnet->lrn_routes));
3757 list_for_each_entry(route, &rnet->lrn_routes,
3759 route_hops = route->lr_hops;
3760 if (route_hops == LNET_UNDEFINED_HOPS)
3762 if (shortest == NULL ||
3763 route_hops < shortest_hops) {
3765 shortest_hops = route_hops;
3769 LASSERT(shortest != NULL);
3770 hops = shortest_hops;
3771 if (srcnidp != NULL) {
3772 ni = lnet_get_next_ni_locked(
3773 shortest->lr_gateway->lpni_net,
3775 *srcnidp = ni->ni_nid;
3779 lnet_net_unlock(cpt);
3785 lnet_net_unlock(cpt);
3786 return -EHOSTUNREACH;
3788 EXPORT_SYMBOL(LNetDist);