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 extern unsigned int lnet_current_net_count;
47 static int local_nid_dist_zero = 1;
48 module_param(local_nid_dist_zero, int, 0444);
49 MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
51 struct lnet_send_data {
52 struct lnet_ni *sd_best_ni;
53 struct lnet_peer_ni *sd_best_lpni;
54 struct lnet_peer_ni *sd_final_dst_lpni;
55 struct lnet_peer *sd_peer;
56 struct lnet_peer *sd_gw_peer;
57 struct lnet_peer_ni *sd_gw_lpni;
58 struct lnet_peer_net *sd_peer_net;
59 struct lnet_msg *sd_msg;
60 lnet_nid_t sd_dst_nid;
61 lnet_nid_t sd_src_nid;
62 lnet_nid_t sd_rtr_nid;
68 static inline struct lnet_comm_count *
69 get_stats_counts(struct lnet_element_stats *stats,
70 enum lnet_stats_type stats_type)
73 case LNET_STATS_TYPE_SEND:
74 return &stats->el_send_stats;
75 case LNET_STATS_TYPE_RECV:
76 return &stats->el_recv_stats;
77 case LNET_STATS_TYPE_DROP:
78 return &stats->el_drop_stats;
80 CERROR("Unknown stats type\n");
86 void lnet_incr_stats(struct lnet_element_stats *stats,
87 enum lnet_msg_type msg_type,
88 enum lnet_stats_type stats_type)
90 struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
96 atomic_inc(&counts->co_ack_count);
99 atomic_inc(&counts->co_put_count);
102 atomic_inc(&counts->co_get_count);
105 atomic_inc(&counts->co_reply_count);
108 atomic_inc(&counts->co_hello_count);
111 CERROR("There is a BUG in the code. Unknown message type\n");
116 __u32 lnet_sum_stats(struct lnet_element_stats *stats,
117 enum lnet_stats_type stats_type)
119 struct lnet_comm_count *counts = get_stats_counts(stats, stats_type);
123 return (atomic_read(&counts->co_ack_count) +
124 atomic_read(&counts->co_put_count) +
125 atomic_read(&counts->co_get_count) +
126 atomic_read(&counts->co_reply_count) +
127 atomic_read(&counts->co_hello_count));
130 static inline void assign_stats(struct lnet_ioctl_comm_count *msg_stats,
131 struct lnet_comm_count *counts)
133 msg_stats->ico_get_count = atomic_read(&counts->co_get_count);
134 msg_stats->ico_put_count = atomic_read(&counts->co_put_count);
135 msg_stats->ico_reply_count = atomic_read(&counts->co_reply_count);
136 msg_stats->ico_ack_count = atomic_read(&counts->co_ack_count);
137 msg_stats->ico_hello_count = atomic_read(&counts->co_hello_count);
140 void lnet_usr_translate_stats(struct lnet_ioctl_element_msg_stats *msg_stats,
141 struct lnet_element_stats *stats)
143 struct lnet_comm_count *counts;
148 counts = get_stats_counts(stats, LNET_STATS_TYPE_SEND);
151 assign_stats(&msg_stats->im_send_stats, counts);
153 counts = get_stats_counts(stats, LNET_STATS_TYPE_RECV);
156 assign_stats(&msg_stats->im_recv_stats, counts);
158 counts = get_stats_counts(stats, LNET_STATS_TYPE_DROP);
161 assign_stats(&msg_stats->im_drop_stats, counts);
165 lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
167 struct lnet_test_peer *tp;
168 struct list_head *el;
169 struct list_head *next;
170 struct list_head cull;
172 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
173 if (threshold != 0) {
174 /* Adding a new entry */
175 LIBCFS_ALLOC(tp, sizeof(*tp));
180 tp->tp_threshold = threshold;
183 list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
188 /* removing entries */
189 INIT_LIST_HEAD(&cull);
193 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
194 tp = list_entry(el, struct lnet_test_peer, tp_list);
196 if (tp->tp_threshold == 0 || /* needs culling anyway */
197 nid == LNET_NID_ANY || /* removing all entries */
198 tp->tp_nid == nid) { /* matched this one */
199 list_del(&tp->tp_list);
200 list_add(&tp->tp_list, &cull);
206 while (!list_empty(&cull)) {
207 tp = list_entry(cull.next, struct lnet_test_peer, tp_list);
209 list_del(&tp->tp_list);
210 LIBCFS_FREE(tp, sizeof(*tp));
216 fail_peer (lnet_nid_t nid, int outgoing)
218 struct lnet_test_peer *tp;
219 struct list_head *el;
220 struct list_head *next;
221 struct list_head cull;
224 INIT_LIST_HEAD(&cull);
226 /* NB: use lnet_net_lock(0) to serialize operations on test peers */
229 list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
230 tp = list_entry(el, struct lnet_test_peer, tp_list);
232 if (tp->tp_threshold == 0) {
235 /* only cull zombies on outgoing tests,
236 * since we may be at interrupt priority on
237 * incoming messages. */
238 list_del(&tp->tp_list);
239 list_add(&tp->tp_list, &cull);
244 if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
245 nid == tp->tp_nid) { /* fail this peer */
248 if (tp->tp_threshold != LNET_MD_THRESH_INF) {
251 tp->tp_threshold == 0) {
253 list_del(&tp->tp_list);
254 list_add(&tp->tp_list, &cull);
263 while (!list_empty(&cull)) {
264 tp = list_entry(cull.next, struct lnet_test_peer, tp_list);
265 list_del(&tp->tp_list);
267 LIBCFS_FREE(tp, sizeof(*tp));
274 lnet_iov_nob(unsigned int niov, struct kvec *iov)
276 unsigned int nob = 0;
278 LASSERT(niov == 0 || iov != NULL);
280 nob += (iov++)->iov_len;
284 EXPORT_SYMBOL(lnet_iov_nob);
287 lnet_copy_iov2iov(unsigned int ndiov, struct kvec *diov, unsigned int doffset,
288 unsigned int nsiov, struct kvec *siov, unsigned int soffset,
291 /* NB diov, siov are READ-ONLY */
292 unsigned int this_nob;
297 /* skip complete frags before 'doffset' */
299 while (doffset >= diov->iov_len) {
300 doffset -= diov->iov_len;
306 /* skip complete frags before 'soffset' */
308 while (soffset >= siov->iov_len) {
309 soffset -= siov->iov_len;
318 this_nob = MIN(diov->iov_len - doffset,
319 siov->iov_len - soffset);
320 this_nob = MIN(this_nob, nob);
322 memcpy((char *)diov->iov_base + doffset,
323 (char *)siov->iov_base + soffset, this_nob);
326 if (diov->iov_len > doffset + this_nob) {
334 if (siov->iov_len > soffset + this_nob) {
343 EXPORT_SYMBOL(lnet_copy_iov2iov);
346 lnet_extract_iov(int dst_niov, struct kvec *dst,
347 int src_niov, struct kvec *src,
348 unsigned int offset, unsigned int len)
350 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
351 * for exactly 'len' bytes, and return the number of entries.
352 * NB not destructive to 'src' */
353 unsigned int frag_len;
356 if (len == 0) /* no data => */
357 return (0); /* no frags */
359 LASSERT(src_niov > 0);
360 while (offset >= src->iov_len) { /* skip initial frags */
361 offset -= src->iov_len;
364 LASSERT(src_niov > 0);
369 LASSERT(src_niov > 0);
370 LASSERT((int)niov <= dst_niov);
372 frag_len = src->iov_len - offset;
373 dst->iov_base = ((char *)src->iov_base) + offset;
375 if (len <= frag_len) {
380 dst->iov_len = frag_len;
390 EXPORT_SYMBOL(lnet_extract_iov);
394 lnet_kiov_nob(unsigned int niov, lnet_kiov_t *kiov)
396 unsigned int nob = 0;
398 LASSERT(niov == 0 || kiov != NULL);
400 nob += (kiov++)->kiov_len;
404 EXPORT_SYMBOL(lnet_kiov_nob);
407 lnet_copy_kiov2kiov(unsigned int ndiov, lnet_kiov_t *diov, unsigned int doffset,
408 unsigned int nsiov, lnet_kiov_t *siov, unsigned int soffset,
411 /* NB diov, siov are READ-ONLY */
412 unsigned int this_nob;
419 LASSERT (!in_interrupt ());
422 while (doffset >= diov->kiov_len) {
423 doffset -= diov->kiov_len;
430 while (soffset >= siov->kiov_len) {
431 soffset -= siov->kiov_len;
440 this_nob = MIN(diov->kiov_len - doffset,
441 siov->kiov_len - soffset);
442 this_nob = MIN(this_nob, nob);
445 daddr = ((char *)kmap(diov->kiov_page)) +
446 diov->kiov_offset + doffset;
448 saddr = ((char *)kmap(siov->kiov_page)) +
449 siov->kiov_offset + soffset;
451 /* Vanishing risk of kmap deadlock when mapping 2 pages.
452 * However in practice at least one of the kiovs will be mapped
453 * kernel pages and the map/unmap will be NOOPs */
455 memcpy (daddr, saddr, this_nob);
458 if (diov->kiov_len > doffset + this_nob) {
462 kunmap(diov->kiov_page);
469 if (siov->kiov_len > soffset + this_nob) {
473 kunmap(siov->kiov_page);
482 kunmap(diov->kiov_page);
484 kunmap(siov->kiov_page);
486 EXPORT_SYMBOL(lnet_copy_kiov2kiov);
489 lnet_copy_kiov2iov (unsigned int niov, struct kvec *iov, unsigned int iovoffset,
490 unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
493 /* NB iov, kiov are READ-ONLY */
494 unsigned int this_nob;
500 LASSERT (!in_interrupt ());
503 while (iovoffset >= iov->iov_len) {
504 iovoffset -= iov->iov_len;
511 while (kiovoffset >= kiov->kiov_len) {
512 kiovoffset -= kiov->kiov_len;
521 this_nob = MIN(iov->iov_len - iovoffset,
522 kiov->kiov_len - kiovoffset);
523 this_nob = MIN(this_nob, nob);
526 addr = ((char *)kmap(kiov->kiov_page)) +
527 kiov->kiov_offset + kiovoffset;
529 memcpy((char *)iov->iov_base + iovoffset, addr, this_nob);
532 if (iov->iov_len > iovoffset + this_nob) {
533 iovoffset += this_nob;
540 if (kiov->kiov_len > kiovoffset + this_nob) {
542 kiovoffset += this_nob;
544 kunmap(kiov->kiov_page);
554 kunmap(kiov->kiov_page);
556 EXPORT_SYMBOL(lnet_copy_kiov2iov);
559 lnet_copy_iov2kiov(unsigned int nkiov, lnet_kiov_t *kiov, unsigned int kiovoffset,
560 unsigned int niov, struct kvec *iov, unsigned int iovoffset,
563 /* NB kiov, iov are READ-ONLY */
564 unsigned int this_nob;
570 LASSERT (!in_interrupt ());
573 while (kiovoffset >= kiov->kiov_len) {
574 kiovoffset -= kiov->kiov_len;
581 while (iovoffset >= iov->iov_len) {
582 iovoffset -= iov->iov_len;
591 this_nob = MIN(kiov->kiov_len - kiovoffset,
592 iov->iov_len - iovoffset);
593 this_nob = MIN(this_nob, nob);
596 addr = ((char *)kmap(kiov->kiov_page)) +
597 kiov->kiov_offset + kiovoffset;
599 memcpy (addr, (char *)iov->iov_base + iovoffset, this_nob);
602 if (kiov->kiov_len > kiovoffset + this_nob) {
604 kiovoffset += this_nob;
606 kunmap(kiov->kiov_page);
613 if (iov->iov_len > iovoffset + this_nob) {
614 iovoffset += this_nob;
623 kunmap(kiov->kiov_page);
625 EXPORT_SYMBOL(lnet_copy_iov2kiov);
628 lnet_extract_kiov(int dst_niov, lnet_kiov_t *dst,
629 int src_niov, lnet_kiov_t *src,
630 unsigned int offset, unsigned int len)
632 /* Initialise 'dst' to the subset of 'src' starting at 'offset',
633 * for exactly 'len' bytes, and return the number of entries.
634 * NB not destructive to 'src' */
635 unsigned int frag_len;
638 if (len == 0) /* no data => */
639 return (0); /* no frags */
641 LASSERT(src_niov > 0);
642 while (offset >= src->kiov_len) { /* skip initial frags */
643 offset -= src->kiov_len;
646 LASSERT(src_niov > 0);
651 LASSERT(src_niov > 0);
652 LASSERT((int)niov <= dst_niov);
654 frag_len = src->kiov_len - offset;
655 dst->kiov_page = src->kiov_page;
656 dst->kiov_offset = src->kiov_offset + offset;
658 if (len <= frag_len) {
660 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
664 dst->kiov_len = frag_len;
665 LASSERT(dst->kiov_offset + dst->kiov_len <= PAGE_SIZE);
675 EXPORT_SYMBOL(lnet_extract_kiov);
678 lnet_ni_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
679 int delayed, unsigned int offset, unsigned int mlen,
682 unsigned int niov = 0;
683 struct kvec *iov = NULL;
684 lnet_kiov_t *kiov = NULL;
687 LASSERT (!in_interrupt ());
688 LASSERT (mlen == 0 || msg != NULL);
691 LASSERT(msg->msg_receiving);
692 LASSERT(!msg->msg_sending);
693 LASSERT(rlen == msg->msg_len);
694 LASSERT(mlen <= msg->msg_len);
695 LASSERT(msg->msg_offset == offset);
696 LASSERT(msg->msg_wanted == mlen);
698 msg->msg_receiving = 0;
701 niov = msg->msg_niov;
703 kiov = msg->msg_kiov;
706 LASSERT ((iov == NULL) != (kiov == NULL));
710 rc = (ni->ni_net->net_lnd->lnd_recv)(ni, private, msg, delayed,
711 niov, iov, kiov, offset, mlen,
714 lnet_finalize(msg, rc);
718 lnet_setpayloadbuffer(struct lnet_msg *msg)
720 struct lnet_libmd *md = msg->msg_md;
722 LASSERT(msg->msg_len > 0);
723 LASSERT(!msg->msg_routing);
725 LASSERT(msg->msg_niov == 0);
726 LASSERT(msg->msg_iov == NULL);
727 LASSERT(msg->msg_kiov == NULL);
729 msg->msg_niov = md->md_niov;
730 if ((md->md_options & LNET_MD_KIOV) != 0)
731 msg->msg_kiov = md->md_iov.kiov;
733 msg->msg_iov = md->md_iov.iov;
737 lnet_prep_send(struct lnet_msg *msg, int type, struct lnet_process_id target,
738 unsigned int offset, unsigned int len)
740 msg->msg_type = type;
741 msg->msg_target = target;
743 msg->msg_offset = offset;
746 lnet_setpayloadbuffer(msg);
748 memset (&msg->msg_hdr, 0, sizeof (msg->msg_hdr));
749 msg->msg_hdr.type = cpu_to_le32(type);
750 /* dest_nid will be overwritten by lnet_select_pathway() */
751 msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
752 msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
753 /* src_nid will be set later */
754 msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
755 msg->msg_hdr.payload_length = cpu_to_le32(len);
759 lnet_ni_send(struct lnet_ni *ni, struct lnet_msg *msg)
761 void *priv = msg->msg_private;
764 LASSERT (!in_interrupt ());
765 LASSERT (LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
766 (msg->msg_txcredit && msg->msg_peertxcredit));
768 rc = (ni->ni_net->net_lnd->lnd_send)(ni, priv, msg);
770 msg->msg_no_resend = true;
771 lnet_finalize(msg, rc);
776 lnet_ni_eager_recv(struct lnet_ni *ni, struct lnet_msg *msg)
780 LASSERT(!msg->msg_sending);
781 LASSERT(msg->msg_receiving);
782 LASSERT(!msg->msg_rx_ready_delay);
783 LASSERT(ni->ni_net->net_lnd->lnd_eager_recv != NULL);
785 msg->msg_rx_ready_delay = 1;
786 rc = (ni->ni_net->net_lnd->lnd_eager_recv)(ni, msg->msg_private, msg,
789 CERROR("recv from %s / send to %s aborted: "
790 "eager_recv failed %d\n",
791 libcfs_nid2str(msg->msg_rxpeer->lpni_nid),
792 libcfs_id2str(msg->msg_target), rc);
793 LASSERT(rc < 0); /* required by my callers */
800 lnet_is_peer_deadline_passed(struct lnet_peer_ni *lpni, time64_t now)
804 deadline = lpni->lpni_last_alive +
805 lpni->lpni_net->net_tunables.lct_peer_timeout;
808 * assume peer_ni is alive as long as we're within the configured
817 /* NB: returns 1 when alive, 0 when dead, negative when error;
818 * may drop the lnet_net_lock */
820 lnet_peer_alive_locked(struct lnet_ni *ni, struct lnet_peer_ni *lpni,
821 struct lnet_msg *msg)
823 time64_t now = ktime_get_seconds();
825 if (!lnet_peer_aliveness_enabled(lpni))
829 * If we're resending a message, let's attempt to send it even if
830 * the peer is down to fulfill our resend quota on the message
832 if (msg->msg_retry_count > 0)
835 /* try and send recovery messages irregardless */
836 if (msg->msg_recovery)
839 /* always send any responses */
840 if (msg->msg_type == LNET_MSG_ACK ||
841 msg->msg_type == LNET_MSG_REPLY)
844 if (!lnet_is_peer_deadline_passed(lpni, now))
847 return lnet_is_peer_ni_alive(lpni);
851 * \param msg The message to be sent.
852 * \param do_send True if lnet_ni_send() should be called in this function.
853 * lnet_send() is going to lnet_net_unlock immediately after this, so
854 * it sets do_send FALSE and I don't do the unlock/send/lock bit.
856 * \retval LNET_CREDIT_OK If \a msg sent or OK to send.
857 * \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
858 * \retval -EHOSTUNREACH If the next hop of the message appears dead.
859 * \retval -ECANCELED If the MD of the message has been unlinked.
862 lnet_post_send_locked(struct lnet_msg *msg, int do_send)
864 struct lnet_peer_ni *lp = msg->msg_txpeer;
865 struct lnet_ni *ni = msg->msg_txni;
866 int cpt = msg->msg_tx_cpt;
867 struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt];
869 /* non-lnet_send() callers have checked before */
870 LASSERT(!do_send || msg->msg_tx_delayed);
871 LASSERT(!msg->msg_receiving);
872 LASSERT(msg->msg_tx_committed);
873 /* can't get here if we're sending to the loopback interface */
874 LASSERT(lp->lpni_nid != the_lnet.ln_loni->ni_nid);
876 /* NB 'lp' is always the next hop */
877 if ((msg->msg_target.pid & LNET_PID_USERFLAG) == 0 &&
878 lnet_peer_alive_locked(ni, lp, msg) == 0) {
879 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
880 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length +=
882 lnet_net_unlock(cpt);
884 lnet_incr_stats(&msg->msg_txpeer->lpni_stats,
886 LNET_STATS_TYPE_DROP);
888 lnet_incr_stats(&msg->msg_txni->ni_stats,
890 LNET_STATS_TYPE_DROP);
892 CNETERR("Dropping message for %s: peer not alive\n",
893 libcfs_id2str(msg->msg_target));
894 msg->msg_health_status = LNET_MSG_STATUS_REMOTE_DROPPED;
896 lnet_finalize(msg, -EHOSTUNREACH);
899 return -EHOSTUNREACH;
902 if (msg->msg_md != NULL &&
903 (msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED) != 0) {
904 lnet_net_unlock(cpt);
906 CNETERR("Aborting message for %s: LNetM[DE]Unlink() already "
907 "called on the MD/ME.\n",
908 libcfs_id2str(msg->msg_target));
910 msg->msg_no_resend = true;
911 CDEBUG(D_NET, "msg %p to %s canceled and will not be resent\n",
912 msg, libcfs_id2str(msg->msg_target));
913 lnet_finalize(msg, -ECANCELED);
920 if (!msg->msg_peertxcredit) {
921 spin_lock(&lp->lpni_lock);
922 LASSERT((lp->lpni_txcredits < 0) ==
923 !list_empty(&lp->lpni_txq));
925 msg->msg_peertxcredit = 1;
926 lp->lpni_txqnob += msg->msg_len + sizeof(struct lnet_hdr);
927 lp->lpni_txcredits--;
929 if (lp->lpni_txcredits < lp->lpni_mintxcredits)
930 lp->lpni_mintxcredits = lp->lpni_txcredits;
932 if (lp->lpni_txcredits < 0) {
933 msg->msg_tx_delayed = 1;
934 list_add_tail(&msg->msg_list, &lp->lpni_txq);
935 spin_unlock(&lp->lpni_lock);
936 return LNET_CREDIT_WAIT;
938 spin_unlock(&lp->lpni_lock);
941 if (!msg->msg_txcredit) {
942 LASSERT((tq->tq_credits < 0) ==
943 !list_empty(&tq->tq_delayed));
945 msg->msg_txcredit = 1;
947 atomic_dec(&ni->ni_tx_credits);
949 if (tq->tq_credits < tq->tq_credits_min)
950 tq->tq_credits_min = tq->tq_credits;
952 if (tq->tq_credits < 0) {
953 msg->msg_tx_delayed = 1;
954 list_add_tail(&msg->msg_list, &tq->tq_delayed);
955 return LNET_CREDIT_WAIT;
959 /* unset the tx_delay flag as we're going to send it now */
960 msg->msg_tx_delayed = 0;
963 lnet_net_unlock(cpt);
964 lnet_ni_send(ni, msg);
967 return LNET_CREDIT_OK;
971 static struct lnet_rtrbufpool *
972 lnet_msg2bufpool(struct lnet_msg *msg)
974 struct lnet_rtrbufpool *rbp;
977 LASSERT(msg->msg_rx_committed);
979 cpt = msg->msg_rx_cpt;
980 rbp = &the_lnet.ln_rtrpools[cpt][0];
982 LASSERT(msg->msg_len <= LNET_MTU);
983 while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_SIZE) {
985 LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
992 lnet_post_routed_recv_locked(struct lnet_msg *msg, int do_recv)
994 /* lnet_parse is going to lnet_net_unlock immediately after this, so it
995 * sets do_recv FALSE and I don't do the unlock/send/lock bit.
996 * I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
997 * received or OK to receive */
998 struct lnet_peer_ni *lpni = msg->msg_rxpeer;
999 struct lnet_peer *lp;
1000 struct lnet_rtrbufpool *rbp;
1001 struct lnet_rtrbuf *rb;
1003 LASSERT(msg->msg_iov == NULL);
1004 LASSERT(msg->msg_kiov == NULL);
1005 LASSERT(msg->msg_niov == 0);
1006 LASSERT(msg->msg_routing);
1007 LASSERT(msg->msg_receiving);
1008 LASSERT(!msg->msg_sending);
1009 LASSERT(lpni->lpni_peer_net);
1010 LASSERT(lpni->lpni_peer_net->lpn_peer);
1012 lp = lpni->lpni_peer_net->lpn_peer;
1014 /* non-lnet_parse callers only receive delayed messages */
1015 LASSERT(!do_recv || msg->msg_rx_delayed);
1017 if (!msg->msg_peerrtrcredit) {
1018 /* lpni_lock protects the credit manipulation */
1019 spin_lock(&lpni->lpni_lock);
1020 /* lp_lock protects the lp_rtrq */
1021 spin_lock(&lp->lp_lock);
1023 msg->msg_peerrtrcredit = 1;
1024 lpni->lpni_rtrcredits--;
1025 if (lpni->lpni_rtrcredits < lpni->lpni_minrtrcredits)
1026 lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
1028 if (lpni->lpni_rtrcredits < 0) {
1029 /* must have checked eager_recv before here */
1030 LASSERT(msg->msg_rx_ready_delay);
1031 msg->msg_rx_delayed = 1;
1032 list_add_tail(&msg->msg_list, &lp->lp_rtrq);
1033 spin_unlock(&lp->lp_lock);
1034 spin_unlock(&lpni->lpni_lock);
1035 return LNET_CREDIT_WAIT;
1037 spin_unlock(&lp->lp_lock);
1038 spin_unlock(&lpni->lpni_lock);
1041 rbp = lnet_msg2bufpool(msg);
1043 if (!msg->msg_rtrcredit) {
1044 msg->msg_rtrcredit = 1;
1046 if (rbp->rbp_credits < rbp->rbp_mincredits)
1047 rbp->rbp_mincredits = rbp->rbp_credits;
1049 if (rbp->rbp_credits < 0) {
1050 /* must have checked eager_recv before here */
1051 LASSERT(msg->msg_rx_ready_delay);
1052 msg->msg_rx_delayed = 1;
1053 list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
1054 return LNET_CREDIT_WAIT;
1058 LASSERT(!list_empty(&rbp->rbp_bufs));
1059 rb = list_entry(rbp->rbp_bufs.next, struct lnet_rtrbuf, rb_list);
1060 list_del(&rb->rb_list);
1062 msg->msg_niov = rbp->rbp_npages;
1063 msg->msg_kiov = &rb->rb_kiov[0];
1065 /* unset the msg-rx_delayed flag since we're receiving the message */
1066 msg->msg_rx_delayed = 0;
1069 int cpt = msg->msg_rx_cpt;
1071 lnet_net_unlock(cpt);
1072 lnet_ni_recv(msg->msg_rxni, msg->msg_private, msg, 1,
1073 0, msg->msg_len, msg->msg_len);
1076 return LNET_CREDIT_OK;
1080 lnet_return_tx_credits_locked(struct lnet_msg *msg)
1082 struct lnet_peer_ni *txpeer = msg->msg_txpeer;
1083 struct lnet_ni *txni = msg->msg_txni;
1084 struct lnet_msg *msg2;
1086 if (msg->msg_txcredit) {
1087 struct lnet_ni *ni = msg->msg_txni;
1088 struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
1090 /* give back NI txcredits */
1091 msg->msg_txcredit = 0;
1093 LASSERT((tq->tq_credits < 0) ==
1094 !list_empty(&tq->tq_delayed));
1097 atomic_inc(&ni->ni_tx_credits);
1098 if (tq->tq_credits <= 0) {
1099 msg2 = list_entry(tq->tq_delayed.next,
1100 struct lnet_msg, msg_list);
1101 list_del(&msg2->msg_list);
1103 LASSERT(msg2->msg_txni == ni);
1104 LASSERT(msg2->msg_tx_delayed);
1105 LASSERT(msg2->msg_tx_cpt == msg->msg_tx_cpt);
1107 (void) lnet_post_send_locked(msg2, 1);
1111 if (msg->msg_peertxcredit) {
1112 /* give back peer txcredits */
1113 msg->msg_peertxcredit = 0;
1115 spin_lock(&txpeer->lpni_lock);
1116 LASSERT((txpeer->lpni_txcredits < 0) ==
1117 !list_empty(&txpeer->lpni_txq));
1119 txpeer->lpni_txqnob -= msg->msg_len + sizeof(struct lnet_hdr);
1120 LASSERT(txpeer->lpni_txqnob >= 0);
1122 txpeer->lpni_txcredits++;
1123 if (txpeer->lpni_txcredits <= 0) {
1126 msg2 = list_entry(txpeer->lpni_txq.next,
1127 struct lnet_msg, msg_list);
1128 list_del(&msg2->msg_list);
1129 spin_unlock(&txpeer->lpni_lock);
1131 LASSERT(msg2->msg_txpeer == txpeer);
1132 LASSERT(msg2->msg_tx_delayed);
1134 msg2_cpt = msg2->msg_tx_cpt;
1137 * The msg_cpt can be different from the msg2_cpt
1138 * so we need to make sure we lock the correct cpt
1140 * Once we call lnet_post_send_locked() it is no
1141 * longer safe to access msg2, since it could've
1142 * been freed by lnet_finalize(), but we still
1143 * need to relock the correct cpt, so we cache the
1144 * msg2_cpt for the purpose of the check that
1145 * follows the call to lnet_pose_send_locked().
1147 if (msg2_cpt != msg->msg_tx_cpt) {
1148 lnet_net_unlock(msg->msg_tx_cpt);
1149 lnet_net_lock(msg2_cpt);
1151 (void) lnet_post_send_locked(msg2, 1);
1152 if (msg2_cpt != msg->msg_tx_cpt) {
1153 lnet_net_unlock(msg2_cpt);
1154 lnet_net_lock(msg->msg_tx_cpt);
1157 spin_unlock(&txpeer->lpni_lock);
1162 msg->msg_txni = NULL;
1163 lnet_ni_decref_locked(txni, msg->msg_tx_cpt);
1166 if (txpeer != NULL) {
1167 msg->msg_txpeer = NULL;
1168 lnet_peer_ni_decref_locked(txpeer);
1173 lnet_schedule_blocked_locked(struct lnet_rtrbufpool *rbp)
1175 struct lnet_msg *msg;
1177 if (list_empty(&rbp->rbp_msgs))
1179 msg = list_entry(rbp->rbp_msgs.next,
1180 struct lnet_msg, msg_list);
1181 list_del(&msg->msg_list);
1183 (void)lnet_post_routed_recv_locked(msg, 1);
1187 lnet_drop_routed_msgs_locked(struct list_head *list, int cpt)
1189 struct lnet_msg *msg;
1190 struct lnet_msg *tmp;
1192 lnet_net_unlock(cpt);
1194 list_for_each_entry_safe(msg, tmp, list, msg_list) {
1195 lnet_ni_recv(msg->msg_rxni, msg->msg_private, NULL,
1196 0, 0, 0, msg->msg_hdr.payload_length);
1197 list_del_init(&msg->msg_list);
1198 msg->msg_no_resend = true;
1199 msg->msg_health_status = LNET_MSG_STATUS_REMOTE_ERROR;
1200 lnet_finalize(msg, -ECANCELED);
1207 lnet_return_rx_credits_locked(struct lnet_msg *msg)
1209 struct lnet_peer_ni *rxpeerni = msg->msg_rxpeer;
1210 struct lnet_peer *lp;
1211 struct lnet_ni *rxni = msg->msg_rxni;
1212 struct lnet_msg *msg2;
1214 if (msg->msg_rtrcredit) {
1215 /* give back global router credits */
1216 struct lnet_rtrbuf *rb;
1217 struct lnet_rtrbufpool *rbp;
1219 /* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
1220 * there until it gets one allocated, or aborts the wait
1222 LASSERT(msg->msg_kiov != NULL);
1224 rb = list_entry(msg->msg_kiov, struct lnet_rtrbuf, rb_kiov[0]);
1227 msg->msg_kiov = NULL;
1228 msg->msg_rtrcredit = 0;
1230 LASSERT(rbp == lnet_msg2bufpool(msg));
1232 LASSERT((rbp->rbp_credits > 0) ==
1233 !list_empty(&rbp->rbp_bufs));
1235 /* If routing is now turned off, we just drop this buffer and
1236 * don't bother trying to return credits. */
1237 if (!the_lnet.ln_routing) {
1238 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1242 /* It is possible that a user has lowered the desired number of
1243 * buffers in this pool. Make sure we never put back
1244 * more buffers than the stated number. */
1245 if (unlikely(rbp->rbp_credits >= rbp->rbp_req_nbuffers)) {
1246 /* Discard this buffer so we don't have too
1248 lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
1249 rbp->rbp_nbuffers--;
1251 list_add(&rb->rb_list, &rbp->rbp_bufs);
1253 if (rbp->rbp_credits <= 0)
1254 lnet_schedule_blocked_locked(rbp);
1259 if (msg->msg_peerrtrcredit) {
1261 LASSERT(rxpeerni->lpni_peer_net);
1262 LASSERT(rxpeerni->lpni_peer_net->lpn_peer);
1264 lp = rxpeerni->lpni_peer_net->lpn_peer;
1266 /* give back peer router credits */
1267 msg->msg_peerrtrcredit = 0;
1269 spin_lock(&rxpeerni->lpni_lock);
1270 spin_lock(&lp->lp_lock);
1272 rxpeerni->lpni_rtrcredits++;
1274 /* drop all messages which are queued to be routed on that
1276 if (!the_lnet.ln_routing) {
1277 struct list_head drop;
1278 INIT_LIST_HEAD(&drop);
1279 list_splice_init(&lp->lp_rtrq, &drop);
1280 spin_unlock(&lp->lp_lock);
1281 spin_unlock(&rxpeerni->lpni_lock);
1282 lnet_drop_routed_msgs_locked(&drop, msg->msg_rx_cpt);
1283 } else if (!list_empty(&lp->lp_rtrq)) {
1286 msg2 = list_entry(lp->lp_rtrq.next,
1287 struct lnet_msg, msg_list);
1288 list_del(&msg2->msg_list);
1289 msg2_cpt = msg2->msg_rx_cpt;
1290 spin_unlock(&lp->lp_lock);
1291 spin_unlock(&rxpeerni->lpni_lock);
1293 * messages on the lp_rtrq can be from any NID in
1294 * the peer, which means they might have different
1295 * cpts. We need to make sure we lock the right
1298 if (msg2_cpt != msg->msg_rx_cpt) {
1299 lnet_net_unlock(msg->msg_rx_cpt);
1300 lnet_net_lock(msg2_cpt);
1302 (void) lnet_post_routed_recv_locked(msg2, 1);
1303 if (msg2_cpt != msg->msg_rx_cpt) {
1304 lnet_net_unlock(msg2_cpt);
1305 lnet_net_lock(msg->msg_rx_cpt);
1308 spin_unlock(&lp->lp_lock);
1309 spin_unlock(&rxpeerni->lpni_lock);
1313 msg->msg_rxni = NULL;
1314 lnet_ni_decref_locked(rxni, msg->msg_rx_cpt);
1316 if (rxpeerni != NULL) {
1317 msg->msg_rxpeer = NULL;
1318 lnet_peer_ni_decref_locked(rxpeerni);
1323 lnet_compare_peers(struct lnet_peer_ni *p1, struct lnet_peer_ni *p2)
1325 if (p1->lpni_txqnob < p2->lpni_txqnob)
1328 if (p1->lpni_txqnob > p2->lpni_txqnob)
1331 if (p1->lpni_txcredits > p2->lpni_txcredits)
1334 if (p1->lpni_txcredits < p2->lpni_txcredits)
1340 static struct lnet_peer_ni *
1341 lnet_select_peer_ni(struct lnet_ni *best_ni, lnet_nid_t dst_nid,
1342 struct lnet_peer *peer,
1343 struct lnet_peer_net *peer_net)
1346 * Look at the peer NIs for the destination peer that connect
1347 * to the chosen net. If a peer_ni is preferred when using the
1348 * best_ni to communicate, we use that one. If there is no
1349 * preferred peer_ni, or there are multiple preferred peer_ni,
1350 * the available transmit credits are used. If the transmit
1351 * credits are equal, we round-robin over the peer_ni.
1353 struct lnet_peer_ni *lpni = NULL;
1354 struct lnet_peer_ni *best_lpni = NULL;
1355 int best_lpni_credits = INT_MIN;
1356 bool preferred = false;
1358 int best_lpni_healthv = 0;
1361 while ((lpni = lnet_get_next_peer_ni_locked(peer, peer_net, lpni))) {
1363 * if the best_ni we've chosen aleady has this lpni
1364 * preferred, then let's use it
1367 ni_is_pref = lnet_peer_is_pref_nid_locked(lpni,
1369 CDEBUG(D_NET, "%s ni_is_pref = %d\n",
1370 libcfs_nid2str(best_ni->ni_nid), ni_is_pref);
1375 lpni_healthv = atomic_read(&lpni->lpni_healthv);
1378 CDEBUG(D_NET, "%s c:[%d, %d], s:[%d, %d]\n",
1379 libcfs_nid2str(lpni->lpni_nid),
1380 lpni->lpni_txcredits, best_lpni_credits,
1381 lpni->lpni_seq, best_lpni->lpni_seq);
1383 /* pick the healthiest peer ni */
1384 if (lpni_healthv < best_lpni_healthv) {
1386 } else if (lpni_healthv > best_lpni_healthv) {
1387 best_lpni_healthv = lpni_healthv;
1388 /* if this is a preferred peer use it */
1389 } else if (!preferred && ni_is_pref) {
1391 } else if (preferred && !ni_is_pref) {
1393 * this is not the preferred peer so let's ignore
1397 } else if (lpni->lpni_txcredits < best_lpni_credits) {
1399 * We already have a peer that has more credits
1400 * available than this one. No need to consider
1401 * this peer further.
1404 } else if (lpni->lpni_txcredits == best_lpni_credits) {
1406 * The best peer found so far and the current peer
1407 * have the same number of available credits let's
1408 * make sure to select between them using Round
1412 if (best_lpni->lpni_seq <= lpni->lpni_seq)
1418 best_lpni_credits = lpni->lpni_txcredits;
1421 /* if we still can't find a peer ni then we can't reach it */
1423 __u32 net_id = (peer_net) ? peer_net->lpn_net_id :
1424 LNET_NIDNET(dst_nid);
1425 CDEBUG(D_NET, "no peer_ni found on peer net %s\n",
1426 libcfs_net2str(net_id));
1430 CDEBUG(D_NET, "sd_best_lpni = %s\n",
1431 libcfs_nid2str(best_lpni->lpni_nid));
1437 * Prerequisite: the best_ni should already be set in the sd
1439 static inline struct lnet_peer_ni *
1440 lnet_find_best_lpni_on_net(struct lnet_send_data *sd, struct lnet_peer *peer,
1443 struct lnet_peer_net *peer_net;
1446 * The gateway is Multi-Rail capable so now we must select the
1449 peer_net = lnet_peer_get_net_locked(peer, net_id);
1452 CERROR("gateway peer %s has no NI on net %s\n",
1453 libcfs_nid2str(peer->lp_primary_nid),
1454 libcfs_net2str(net_id));
1458 return lnet_select_peer_ni(sd->sd_best_ni, sd->sd_dst_nid,
1463 lnet_compare_routes(struct lnet_route *r1, struct lnet_route *r2,
1464 struct lnet_peer_ni **best_lpni)
1466 int r1_hops = (r1->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r1->lr_hops;
1467 int r2_hops = (r2->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r2->lr_hops;
1468 struct lnet_peer *lp1 = r1->lr_gateway;
1469 struct lnet_peer *lp2 = r2->lr_gateway;
1470 struct lnet_peer_ni *lpni1;
1471 struct lnet_peer_ni *lpni2;
1472 struct lnet_send_data sd;
1475 sd.sd_best_ni = NULL;
1476 sd.sd_dst_nid = LNET_NID_ANY;
1477 lpni1 = lnet_find_best_lpni_on_net(&sd, lp1, r1->lr_lnet);
1478 lpni2 = lnet_find_best_lpni_on_net(&sd, lp2, r2->lr_lnet);
1479 LASSERT(lpni1 && lpni2);
1481 if (r1->lr_priority < r2->lr_priority) {
1486 if (r1->lr_priority > r2->lr_priority) {
1491 if (r1_hops < r2_hops) {
1496 if (r1_hops > r2_hops) {
1501 rc = lnet_compare_peers(lpni1, lpni2);
1505 } else if (rc == -1) {
1510 if (r1->lr_seq - r2->lr_seq <= 0) {
1519 static struct lnet_route *
1520 lnet_find_route_locked(struct lnet_net *net, __u32 remote_net,
1521 lnet_nid_t rtr_nid, struct lnet_route **prev_route,
1522 struct lnet_peer_ni **gwni)
1524 struct lnet_peer_ni *best_gw_ni = NULL;
1525 struct lnet_route *best_route;
1526 struct lnet_route *last_route;
1527 struct lnet_remotenet *rnet;
1528 struct lnet_peer *lp_best;
1529 struct lnet_route *route;
1530 struct lnet_peer *lp;
1533 /* If @rtr_nid is not LNET_NID_ANY, return the gateway with
1534 * rtr_nid nid, otherwise find the best gateway I can use */
1536 rnet = lnet_find_rnet_locked(remote_net);
1541 best_route = last_route = NULL;
1542 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
1543 lp = route->lr_gateway;
1545 if (!lnet_is_route_alive(route))
1548 if (lp_best == NULL) {
1549 best_route = last_route = route;
1553 /* no protection on below fields, but it's harmless */
1554 if (last_route->lr_seq - route->lr_seq < 0)
1557 rc = lnet_compare_routes(route, best_route, &best_gw_ni);
1565 *prev_route = last_route;
1571 static struct lnet_ni *
1572 lnet_get_best_ni(struct lnet_net *local_net, struct lnet_ni *best_ni,
1573 struct lnet_peer *peer, struct lnet_peer_net *peer_net,
1576 struct lnet_ni *ni = NULL;
1577 unsigned int shortest_distance;
1582 * If there is no peer_ni that we can send to on this network,
1583 * then there is no point in looking for a new best_ni here.
1585 if (!lnet_get_next_peer_ni_locked(peer, peer_net, NULL))
1588 if (best_ni == NULL) {
1589 shortest_distance = UINT_MAX;
1590 best_credits = INT_MIN;
1593 shortest_distance = cfs_cpt_distance(lnet_cpt_table(), md_cpt,
1594 best_ni->ni_dev_cpt);
1595 best_credits = atomic_read(&best_ni->ni_tx_credits);
1596 best_healthv = atomic_read(&best_ni->ni_healthv);
1599 while ((ni = lnet_get_next_ni_locked(local_net, ni))) {
1600 unsigned int distance;
1605 ni_credits = atomic_read(&ni->ni_tx_credits);
1606 ni_healthv = atomic_read(&ni->ni_healthv);
1607 ni_fatal = atomic_read(&ni->ni_fatal_error_on);
1610 * calculate the distance from the CPT on which
1611 * the message memory is allocated to the CPT of
1612 * the NI's physical device
1614 distance = cfs_cpt_distance(lnet_cpt_table(),
1618 CDEBUG(D_NET, "compare ni %s [c:%d, d:%d, s:%d] with best_ni %s [c:%d, d:%d, s:%d]\n",
1619 libcfs_nid2str(ni->ni_nid), ni_credits, distance,
1620 ni->ni_seq, (best_ni) ? libcfs_nid2str(best_ni->ni_nid)
1621 : "not seleced", best_credits, shortest_distance,
1622 (best_ni) ? best_ni->ni_seq : 0);
1625 * All distances smaller than the NUMA range
1626 * are treated equally.
1628 if (distance < lnet_numa_range)
1629 distance = lnet_numa_range;
1632 * Select on health, shorter distance, available
1633 * credits, then round-robin.
1637 } else if (ni_healthv < best_healthv) {
1639 } else if (ni_healthv > best_healthv) {
1640 best_healthv = ni_healthv;
1642 * If we're going to prefer this ni because it's
1643 * the healthiest, then we should set the
1644 * shortest_distance in the algorithm in case
1645 * there are multiple NIs with the same health but
1646 * different distances.
1648 if (distance < shortest_distance)
1649 shortest_distance = distance;
1650 } else if (distance > shortest_distance) {
1652 } else if (distance < shortest_distance) {
1653 shortest_distance = distance;
1654 } else if (ni_credits < best_credits) {
1656 } else if (ni_credits == best_credits) {
1657 if (best_ni && best_ni->ni_seq <= ni->ni_seq)
1661 best_credits = ni_credits;
1664 CDEBUG(D_NET, "selected best_ni %s\n",
1665 (best_ni) ? libcfs_nid2str(best_ni->ni_nid) : "no selection");
1671 * Traffic to the LNET_RESERVED_PORTAL may not trigger peer discovery,
1672 * because such traffic is required to perform discovery. We therefore
1673 * exclude all GET and PUT on that portal. We also exclude all ACK and
1674 * REPLY traffic, but that is because the portal is not tracked in the
1675 * message structure for these message types. We could restrict this
1676 * further by also checking for LNET_PROTO_PING_MATCHBITS.
1679 lnet_msg_discovery(struct lnet_msg *msg)
1681 if (msg->msg_type == LNET_MSG_PUT) {
1682 if (msg->msg_hdr.msg.put.ptl_index != LNET_RESERVED_PORTAL)
1684 } else if (msg->msg_type == LNET_MSG_GET) {
1685 if (msg->msg_hdr.msg.get.ptl_index != LNET_RESERVED_PORTAL)
1691 #define SRC_SPEC 0x0001
1692 #define SRC_ANY 0x0002
1693 #define LOCAL_DST 0x0004
1694 #define REMOTE_DST 0x0008
1695 #define MR_DST 0x0010
1696 #define NMR_DST 0x0020
1697 #define SND_RESP 0x0040
1699 /* The following to defines are used for return codes */
1700 #define REPEAT_SEND 0x1000
1701 #define PASS_THROUGH 0x2000
1703 /* The different cases lnet_select pathway needs to handle */
1704 #define SRC_SPEC_LOCAL_MR_DST (SRC_SPEC | LOCAL_DST | MR_DST)
1705 #define SRC_SPEC_ROUTER_MR_DST (SRC_SPEC | REMOTE_DST | MR_DST)
1706 #define SRC_SPEC_LOCAL_NMR_DST (SRC_SPEC | LOCAL_DST | NMR_DST)
1707 #define SRC_SPEC_ROUTER_NMR_DST (SRC_SPEC | REMOTE_DST | NMR_DST)
1708 #define SRC_ANY_LOCAL_MR_DST (SRC_ANY | LOCAL_DST | MR_DST)
1709 #define SRC_ANY_ROUTER_MR_DST (SRC_ANY | REMOTE_DST | MR_DST)
1710 #define SRC_ANY_LOCAL_NMR_DST (SRC_ANY | LOCAL_DST | NMR_DST)
1711 #define SRC_ANY_ROUTER_NMR_DST (SRC_ANY | REMOTE_DST | NMR_DST)
1714 lnet_handle_lo_send(struct lnet_send_data *sd)
1716 struct lnet_msg *msg = sd->sd_msg;
1717 int cpt = sd->sd_cpt;
1719 /* No send credit hassles with LOLND */
1720 lnet_ni_addref_locked(the_lnet.ln_loni, cpt);
1721 msg->msg_hdr.dest_nid = cpu_to_le64(the_lnet.ln_loni->ni_nid);
1722 if (!msg->msg_routing)
1723 msg->msg_hdr.src_nid =
1724 cpu_to_le64(the_lnet.ln_loni->ni_nid);
1725 msg->msg_target.nid = the_lnet.ln_loni->ni_nid;
1726 lnet_msg_commit(msg, cpt);
1727 msg->msg_txni = the_lnet.ln_loni;
1729 return LNET_CREDIT_OK;
1733 lnet_handle_send(struct lnet_send_data *sd)
1735 struct lnet_ni *best_ni = sd->sd_best_ni;
1736 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
1737 struct lnet_peer_ni *final_dst_lpni = sd->sd_final_dst_lpni;
1738 struct lnet_msg *msg = sd->sd_msg;
1740 __u32 send_case = sd->sd_send_case;
1742 __u32 routing = send_case & REMOTE_DST;
1743 struct lnet_rsp_tracker *rspt;
1746 * Increment sequence number of the selected peer so that we
1747 * pick the next one in Round Robin.
1749 best_lpni->lpni_seq++;
1752 * grab a reference on the peer_ni so it sticks around even if
1753 * we need to drop and relock the lnet_net_lock below.
1755 lnet_peer_ni_addref_locked(best_lpni);
1758 * Use lnet_cpt_of_nid() to determine the CPT used to commit the
1759 * message. This ensures that we get a CPT that is correct for
1760 * the NI when the NI has been restricted to a subset of all CPTs.
1761 * If the selected CPT differs from the one currently locked, we
1762 * must unlock and relock the lnet_net_lock(), and then check whether
1763 * the configuration has changed. We don't have a hold on the best_ni
1764 * yet, and it may have vanished.
1766 cpt2 = lnet_cpt_of_nid_locked(best_lpni->lpni_nid, best_ni);
1767 if (sd->sd_cpt != cpt2) {
1768 __u32 seq = lnet_get_dlc_seq_locked();
1769 lnet_net_unlock(sd->sd_cpt);
1771 lnet_net_lock(sd->sd_cpt);
1772 if (seq != lnet_get_dlc_seq_locked()) {
1773 lnet_peer_ni_decref_locked(best_lpni);
1779 * store the best_lpni in the message right away to avoid having
1780 * to do the same operation under different conditions
1782 msg->msg_txpeer = best_lpni;
1783 msg->msg_txni = best_ni;
1786 * grab a reference for the best_ni since now it's in use in this
1787 * send. The reference will be dropped in lnet_finalize()
1789 lnet_ni_addref_locked(msg->msg_txni, sd->sd_cpt);
1792 * Always set the target.nid to the best peer picked. Either the
1793 * NID will be one of the peer NIDs selected, or the same NID as
1794 * what was originally set in the target or it will be the NID of
1795 * a router if this message should be routed
1797 msg->msg_target.nid = msg->msg_txpeer->lpni_nid;
1800 * lnet_msg_commit assigns the correct cpt to the message, which
1801 * is used to decrement the correct refcount on the ni when it's
1802 * time to return the credits
1804 lnet_msg_commit(msg, sd->sd_cpt);
1807 * If we are routing the message then we keep the src_nid that was
1808 * set by the originator. If we are not routing then we are the
1809 * originator and set it here.
1811 if (!msg->msg_routing)
1812 msg->msg_hdr.src_nid = cpu_to_le64(msg->msg_txni->ni_nid);
1815 msg->msg_target_is_router = 1;
1816 msg->msg_target.pid = LNET_PID_LUSTRE;
1818 * since we're routing we want to ensure that the
1819 * msg_hdr.dest_nid is set to the final destination. When
1820 * the router receives this message it knows how to route
1823 * final_dst_lpni is set at the beginning of the
1824 * lnet_select_pathway() function and is never changed.
1825 * It's safe to use it here.
1827 msg->msg_hdr.dest_nid = cpu_to_le64(final_dst_lpni->lpni_nid);
1830 * if we're not routing set the dest_nid to the best peer
1831 * ni NID that we picked earlier in the algorithm.
1833 msg->msg_hdr.dest_nid = cpu_to_le64(msg->msg_txpeer->lpni_nid);
1837 * if we have response tracker block update it with the next hop
1841 rspt = msg->msg_md->md_rspt_ptr;
1843 rspt->rspt_next_hop_nid = msg->msg_txpeer->lpni_nid;
1844 CDEBUG(D_NET, "rspt_next_hop_nid = %s\n",
1845 libcfs_nid2str(rspt->rspt_next_hop_nid));
1849 rc = lnet_post_send_locked(msg, 0);
1852 CDEBUG(D_NET, "TRACE: %s(%s:%s) -> %s(%s:%s) : %s try# %d\n",
1853 libcfs_nid2str(msg->msg_hdr.src_nid),
1854 libcfs_nid2str(msg->msg_txni->ni_nid),
1855 libcfs_nid2str(sd->sd_src_nid),
1856 libcfs_nid2str(msg->msg_hdr.dest_nid),
1857 libcfs_nid2str(sd->sd_dst_nid),
1858 libcfs_nid2str(msg->msg_txpeer->lpni_nid),
1859 lnet_msgtyp2str(msg->msg_type), msg->msg_retry_count);
1865 lnet_set_non_mr_pref_nid(struct lnet_send_data *sd)
1867 if (sd->sd_send_case & NMR_DST &&
1868 sd->sd_msg->msg_type != LNET_MSG_REPLY &&
1869 sd->sd_msg->msg_type != LNET_MSG_ACK &&
1870 sd->sd_best_lpni->lpni_pref_nnids == 0) {
1871 CDEBUG(D_NET, "Setting preferred local NID %s on NMR peer %s\n",
1872 libcfs_nid2str(sd->sd_best_ni->ni_nid),
1873 libcfs_nid2str(sd->sd_best_lpni->lpni_nid));
1874 lnet_peer_ni_set_non_mr_pref_nid(sd->sd_best_lpni,
1875 sd->sd_best_ni->ni_nid);
1884 * use the source and destination NIDs as the pathway
1887 lnet_handle_spec_local_nmr_dst(struct lnet_send_data *sd)
1889 /* the destination lpni is set before we get here. */
1892 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
1893 if (!sd->sd_best_ni) {
1894 CERROR("Can't send to %s: src %s is not a "
1895 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
1896 libcfs_nid2str(sd->sd_src_nid));
1901 * the preferred NID will only be set for NMR peers
1903 lnet_set_non_mr_pref_nid(sd);
1905 return lnet_handle_send(sd);
1913 * Run the selection algorithm on the peer NIs unless we're sending
1914 * a response, in this case just send to the destination
1917 lnet_handle_spec_local_mr_dst(struct lnet_send_data *sd)
1919 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
1920 if (!sd->sd_best_ni) {
1921 CERROR("Can't send to %s: src %s is not a "
1922 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
1923 libcfs_nid2str(sd->sd_src_nid));
1928 * only run the selection algorithm to pick the peer_ni if we're
1929 * sending a GET or a PUT. Responses are sent to the same
1930 * destination NID provided.
1932 if (!(sd->sd_send_case & SND_RESP)) {
1934 lnet_find_best_lpni_on_net(sd, sd->sd_peer,
1935 sd->sd_best_ni->ni_net->net_id);
1938 if (sd->sd_best_lpni &&
1939 sd->sd_best_lpni->lpni_nid == the_lnet.ln_loni->ni_nid)
1940 return lnet_handle_lo_send(sd);
1941 else if (sd->sd_best_lpni)
1942 return lnet_handle_send(sd);
1944 CERROR("can't send to %s. no NI on %s\n",
1945 libcfs_nid2str(sd->sd_dst_nid),
1946 libcfs_net2str(sd->sd_best_ni->ni_net->net_id));
1948 return -EHOSTUNREACH;
1952 lnet_find_best_ni_on_spec_net(struct lnet_ni *cur_best_ni,
1953 struct lnet_peer *peer,
1954 struct lnet_peer_net *peer_net,
1958 struct lnet_net *local_net;
1959 struct lnet_ni *best_ni;
1961 local_net = lnet_get_net_locked(peer_net->lpn_net_id);
1966 * Iterate through the NIs in this local Net and select
1967 * the NI to send from. The selection is determined by
1968 * these 3 criterion in the following priority:
1970 * 2. NI available credits
1973 best_ni = lnet_get_best_ni(local_net, cur_best_ni,
1974 peer, peer_net, cpt);
1976 if (incr_seq && best_ni)
1983 lnet_initiate_peer_discovery(struct lnet_peer_ni *lpni,
1984 struct lnet_msg *msg, lnet_nid_t rtr_nid,
1987 struct lnet_peer *peer;
1988 lnet_nid_t primary_nid;
1991 lnet_peer_ni_addref_locked(lpni);
1993 peer = lpni->lpni_peer_net->lpn_peer;
1995 if (lnet_peer_gw_discovery(peer)) {
1996 lnet_peer_ni_decref_locked(lpni);
2000 if (!lnet_msg_discovery(msg) || lnet_peer_is_uptodate(peer)) {
2001 lnet_peer_ni_decref_locked(lpni);
2005 rc = lnet_discover_peer_locked(lpni, cpt, false);
2007 lnet_peer_ni_decref_locked(lpni);
2010 /* The peer may have changed. */
2011 peer = lpni->lpni_peer_net->lpn_peer;
2012 /* queue message and return */
2013 msg->msg_rtr_nid_param = rtr_nid;
2014 msg->msg_sending = 0;
2015 msg->msg_txpeer = NULL;
2016 spin_lock(&peer->lp_lock);
2017 list_add_tail(&msg->msg_list, &peer->lp_dc_pendq);
2018 spin_unlock(&peer->lp_lock);
2019 lnet_peer_ni_decref_locked(lpni);
2020 primary_nid = peer->lp_primary_nid;
2022 CDEBUG(D_NET, "msg %p delayed. %s pending discovery\n",
2023 msg, libcfs_nid2str(primary_nid));
2025 return LNET_DC_WAIT;
2029 lnet_handle_find_routed_path(struct lnet_send_data *sd,
2031 struct lnet_peer_ni **gw_lpni,
2032 struct lnet_peer **gw_peer)
2035 struct lnet_peer *gw;
2036 struct lnet_peer *lp;
2037 struct lnet_peer_net *lpn;
2038 struct lnet_peer_net *best_lpn = NULL;
2039 struct lnet_remotenet *rnet;
2040 struct lnet_route *best_route;
2041 struct lnet_route *last_route;
2042 struct lnet_peer_ni *lpni = NULL;
2043 struct lnet_peer_ni *gwni = NULL;
2044 lnet_nid_t src_nid = sd->sd_src_nid;
2046 /* we've already looked up the initial lpni using dst_nid */
2047 lpni = sd->sd_best_lpni;
2048 /* the peer tree must be in existence */
2049 LASSERT(lpni && lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
2050 lp = lpni->lpni_peer_net->lpn_peer;
2052 list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
2053 /* is this remote network reachable? */
2054 rnet = lnet_find_rnet_locked(lpn->lpn_net_id);
2061 if (best_lpn->lpn_seq <= lpn->lpn_seq)
2068 CERROR("peer %s has no available nets \n",
2069 libcfs_nid2str(sd->sd_dst_nid));
2070 return -EHOSTUNREACH;
2073 sd->sd_best_lpni = lnet_find_best_lpni_on_net(sd, lp, best_lpn->lpn_net_id);
2074 if (!sd->sd_best_lpni) {
2075 CERROR("peer %s down\n", libcfs_nid2str(sd->sd_dst_nid));
2076 return -EHOSTUNREACH;
2079 best_route = lnet_find_route_locked(NULL, best_lpn->lpn_net_id,
2080 sd->sd_rtr_nid, &last_route,
2083 CERROR("no route to %s from %s\n",
2084 libcfs_nid2str(dst_nid), libcfs_nid2str(src_nid));
2085 return -EHOSTUNREACH;
2089 CERROR("Internal Error. Route expected to %s from %s\n",
2090 libcfs_nid2str(dst_nid),
2091 libcfs_nid2str(src_nid));
2095 gw = best_route->lr_gateway;
2096 LASSERT(gw == gwni->lpni_peer_net->lpn_peer);
2099 * Discover this gateway if it hasn't already been discovered.
2100 * This means we might delay the message until discovery has
2103 sd->sd_msg->msg_src_nid_param = sd->sd_src_nid;
2104 rc = lnet_initiate_peer_discovery(gwni, sd->sd_msg, sd->sd_rtr_nid,
2109 if (!sd->sd_best_ni)
2110 sd->sd_best_ni = lnet_find_best_ni_on_spec_net(NULL, gw,
2111 lnet_peer_get_net_locked(gw,
2112 best_route->lr_lnet),
2116 if (!sd->sd_best_ni) {
2117 CERROR("Internal Error. Expected local ni on %s "
2118 "but non found :%s\n",
2119 libcfs_net2str(best_route->lr_lnet),
2120 libcfs_nid2str(sd->sd_src_nid));
2128 * increment the sequence numbers since now we're sure we're
2129 * going to use this path
2131 LASSERT(best_route && last_route);
2132 best_route->lr_seq = last_route->lr_seq + 1;
2133 best_lpn->lpn_seq++;
2143 * Remote destination
2144 * Non-MR destination
2148 * Remote destination
2151 * The handling of these two cases is similar. Even though the destination
2152 * can be MR or non-MR, we'll deal directly with the router.
2155 lnet_handle_spec_router_dst(struct lnet_send_data *sd)
2158 struct lnet_peer_ni *gw_lpni = NULL;
2159 struct lnet_peer *gw_peer = NULL;
2162 sd->sd_best_ni = lnet_nid2ni_locked(sd->sd_src_nid, sd->sd_cpt);
2163 if (!sd->sd_best_ni) {
2164 CERROR("Can't send to %s: src %s is not a "
2165 "local nid\n", libcfs_nid2str(sd->sd_dst_nid),
2166 libcfs_nid2str(sd->sd_src_nid));
2170 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2175 if (sd->sd_send_case & NMR_DST)
2177 * since the final destination is non-MR let's set its preferred
2178 * NID before we send
2180 lnet_set_non_mr_pref_nid(sd);
2183 * We're going to send to the gw found so let's set its
2186 sd->sd_peer = gw_peer;
2187 sd->sd_best_lpni = gw_lpni;
2189 return lnet_handle_send(sd);
2193 lnet_find_best_ni_on_local_net(struct lnet_peer *peer, int md_cpt,
2196 struct lnet_peer_net *peer_net = NULL;
2197 struct lnet_ni *best_ni = NULL;
2200 * The peer can have multiple interfaces, some of them can be on
2201 * the local network and others on a routed network. We should
2202 * prefer the local network. However if the local network is not
2203 * available then we need to try the routed network
2206 /* go through all the peer nets and find the best_ni */
2207 list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
2209 * The peer's list of nets can contain non-local nets. We
2210 * want to only examine the local ones.
2212 if (!lnet_get_net_locked(peer_net->lpn_net_id))
2214 best_ni = lnet_find_best_ni_on_spec_net(best_ni, peer,
2215 peer_net, md_cpt, false);
2218 * if this is a discovery message and lp_disc_net_id is
2219 * specified then use that net to send the discovery on.
2221 if (peer->lp_disc_net_id == peer_net->lpn_net_id &&
2227 /* increment sequence number so we can round robin */
2233 static struct lnet_ni *
2234 lnet_find_existing_preferred_best_ni(struct lnet_send_data *sd)
2236 struct lnet_ni *best_ni = NULL;
2237 struct lnet_peer_net *peer_net;
2238 struct lnet_peer *peer = sd->sd_peer;
2239 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
2240 struct lnet_peer_ni *lpni;
2241 int cpt = sd->sd_cpt;
2244 * We must use a consistent source address when sending to a
2245 * non-MR peer. However, a non-MR peer can have multiple NIDs
2246 * on multiple networks, and we may even need to talk to this
2247 * peer on multiple networks -- certain types of
2248 * load-balancing configuration do this.
2250 * So we need to pick the NI the peer prefers for this
2251 * particular network.
2254 /* Get the target peer_ni */
2255 peer_net = lnet_peer_get_net_locked(peer,
2256 LNET_NIDNET(best_lpni->lpni_nid));
2257 LASSERT(peer_net != NULL);
2258 list_for_each_entry(lpni, &peer_net->lpn_peer_nis,
2260 if (lpni->lpni_pref_nnids == 0)
2262 LASSERT(lpni->lpni_pref_nnids == 1);
2263 best_ni = lnet_nid2ni_locked(
2264 lpni->lpni_pref.nid, cpt);
2271 /* Prerequisite: sd->sd_peer and sd->sd_best_lpni should be set */
2273 lnet_select_preferred_best_ni(struct lnet_send_data *sd)
2275 struct lnet_ni *best_ni = NULL;
2276 struct lnet_peer_ni *best_lpni = sd->sd_best_lpni;
2279 * We must use a consistent source address when sending to a
2280 * non-MR peer. However, a non-MR peer can have multiple NIDs
2281 * on multiple networks, and we may even need to talk to this
2282 * peer on multiple networks -- certain types of
2283 * load-balancing configuration do this.
2285 * So we need to pick the NI the peer prefers for this
2286 * particular network.
2289 best_ni = lnet_find_existing_preferred_best_ni(sd);
2291 /* if best_ni is still not set just pick one */
2294 lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
2295 sd->sd_best_lpni->lpni_peer_net,
2296 sd->sd_md_cpt, true);
2297 /* If there is no best_ni we don't have a route */
2299 CERROR("no path to %s from net %s\n",
2300 libcfs_nid2str(best_lpni->lpni_nid),
2301 libcfs_net2str(best_lpni->lpni_net->net_id));
2302 return -EHOSTUNREACH;
2306 sd->sd_best_ni = best_ni;
2308 /* Set preferred NI if necessary. */
2309 lnet_set_non_mr_pref_nid(sd);
2316 * Source not specified
2320 * always use the same source NID for NMR peers
2321 * If we've talked to that peer before then we already have a preferred
2322 * source NI associated with it. Otherwise, we select a preferred local NI
2323 * and store it in the peer
2326 lnet_handle_any_local_nmr_dst(struct lnet_send_data *sd)
2330 /* sd->sd_best_lpni is already set to the final destination */
2333 * At this point we should've created the peer ni and peer. If we
2334 * can't find it, then something went wrong. Instead of assert
2335 * output a relevant message and fail the send
2337 if (!sd->sd_best_lpni) {
2338 CERROR("Internal fault. Unable to send msg %s to %s. "
2340 lnet_msgtyp2str(sd->sd_msg->msg_type),
2341 libcfs_nid2str(sd->sd_dst_nid));
2345 rc = lnet_select_preferred_best_ni(sd);
2347 rc = lnet_handle_send(sd);
2353 lnet_handle_any_mr_dsta(struct lnet_send_data *sd)
2356 * NOTE we've already handled the remote peer case. So we only
2357 * need to worry about the local case here.
2359 * if we're sending a response, ACK or reply, we need to send it
2360 * to the destination NID given to us. At this point we already
2361 * have the peer_ni we're suppose to send to, so just find the
2362 * best_ni on the peer net and use that. Since we're sending to an
2363 * MR peer then we can just run the selection algorithm on our
2364 * local NIs and pick the best one.
2366 if (sd->sd_send_case & SND_RESP) {
2368 lnet_find_best_ni_on_spec_net(NULL, sd->sd_peer,
2369 sd->sd_best_lpni->lpni_peer_net,
2370 sd->sd_md_cpt, true);
2372 if (!sd->sd_best_ni) {
2374 * We're not going to deal with not able to send
2375 * a response to the provided final destination
2377 CERROR("Can't send response to %s. "
2378 "No local NI available\n",
2379 libcfs_nid2str(sd->sd_dst_nid));
2380 return -EHOSTUNREACH;
2383 return lnet_handle_send(sd);
2387 * If we get here that means we're sending a fresh request, PUT or
2388 * GET, so we need to run our standard selection algorithm.
2389 * First find the best local interface that's on any of the peer's
2392 sd->sd_best_ni = lnet_find_best_ni_on_local_net(sd->sd_peer,
2394 lnet_msg_discovery(sd->sd_msg));
2395 if (sd->sd_best_ni) {
2397 lnet_find_best_lpni_on_net(sd, sd->sd_peer,
2398 sd->sd_best_ni->ni_net->net_id);
2401 * if we're successful in selecting a peer_ni on the local
2402 * network, then send to it. Otherwise fall through and
2403 * try and see if we can reach it over another routed
2406 if (sd->sd_best_lpni &&
2407 sd->sd_best_lpni->lpni_nid == the_lnet.ln_loni->ni_nid) {
2409 * in case we initially started with a routed
2410 * destination, let's reset to local
2412 sd->sd_send_case &= ~REMOTE_DST;
2413 sd->sd_send_case |= LOCAL_DST;
2414 return lnet_handle_lo_send(sd);
2415 } else if (sd->sd_best_lpni) {
2417 * in case we initially started with a routed
2418 * destination, let's reset to local
2420 sd->sd_send_case &= ~REMOTE_DST;
2421 sd->sd_send_case |= LOCAL_DST;
2422 return lnet_handle_send(sd);
2425 CERROR("Internal Error. Expected to have a best_lpni: "
2427 libcfs_nid2str(sd->sd_src_nid),
2428 libcfs_nid2str(sd->sd_dst_nid));
2434 * Peer doesn't have a local network. Let's see if there is
2435 * a remote network we can reach it on.
2437 return PASS_THROUGH;
2442 * Source NID not specified
2447 * Source NID not speified
2448 * Remote destination
2451 * In both of these cases if we're sending a response, ACK or REPLY, then
2452 * we need to send to the destination NID provided.
2454 * In the remote case let's deal with MR routers.
2459 lnet_handle_any_mr_dst(struct lnet_send_data *sd)
2462 struct lnet_peer *gw_peer = NULL;
2463 struct lnet_peer_ni *gw_lpni = NULL;
2466 * handle sending a response to a remote peer here so we don't
2467 * have to worry about it if we hit lnet_handle_any_mr_dsta()
2469 if (sd->sd_send_case & REMOTE_DST &&
2470 sd->sd_send_case & SND_RESP) {
2471 struct lnet_peer_ni *gw;
2472 struct lnet_peer *gw_peer;
2474 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw,
2477 CERROR("Can't send response to %s. "
2478 "No route available\n",
2479 libcfs_nid2str(sd->sd_dst_nid));
2480 return -EHOSTUNREACH;
2481 } else if (rc > 0) {
2485 sd->sd_best_lpni = gw;
2486 sd->sd_peer = gw_peer;
2488 return lnet_handle_send(sd);
2492 * Even though the NID for the peer might not be on a local network,
2493 * since the peer is MR there could be other interfaces on the
2494 * local network. In that case we'd still like to prefer the local
2495 * network over the routed network. If we're unable to do that
2496 * then we select the best router among the different routed networks,
2497 * and if the router is MR then we can deal with it as such.
2499 rc = lnet_handle_any_mr_dsta(sd);
2500 if (rc != PASS_THROUGH)
2504 * Now that we must route to the destination, we must consider the
2505 * MR case, where the destination has multiple interfaces, some of
2506 * which we can route to and others we do not. For this reason we
2507 * need to select the destination which we can route to and if
2508 * there are multiple, we need to round robin.
2510 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2515 sd->sd_send_case &= ~LOCAL_DST;
2516 sd->sd_send_case |= REMOTE_DST;
2518 sd->sd_peer = gw_peer;
2519 sd->sd_best_lpni = gw_lpni;
2521 return lnet_handle_send(sd);
2525 * Source not specified
2526 * Remote destination
2529 * Must send to the specified peer NID using the same source NID that
2530 * we've used before. If it's the first time to talk to that peer then
2531 * find the source NI and assign it as preferred to that peer
2534 lnet_handle_any_router_nmr_dst(struct lnet_send_data *sd)
2537 struct lnet_peer_ni *gw_lpni = NULL;
2538 struct lnet_peer *gw_peer = NULL;
2541 * Let's set if we have a preferred NI to talk to this NMR peer
2543 sd->sd_best_ni = lnet_find_existing_preferred_best_ni(sd);
2546 * find the router and that'll find the best NI if we didn't find
2549 rc = lnet_handle_find_routed_path(sd, sd->sd_dst_nid, &gw_lpni,
2555 * set the best_ni we've chosen as the preferred one for
2558 lnet_set_non_mr_pref_nid(sd);
2560 /* we'll be sending to the gw */
2561 sd->sd_best_lpni = gw_lpni;
2562 sd->sd_peer = gw_peer;
2564 return lnet_handle_send(sd);
2568 lnet_handle_send_case_locked(struct lnet_send_data *sd)
2571 * turn off the SND_RESP bit.
2572 * It will be checked in the case handling
2574 __u32 send_case = sd->sd_send_case &= ~SND_RESP ;
2576 CDEBUG(D_NET, "Source %s%s to %s %s %s destination\n",
2577 (send_case & SRC_SPEC) ? "Specified: " : "ANY",
2578 (send_case & SRC_SPEC) ? libcfs_nid2str(sd->sd_src_nid) : "",
2579 (send_case & MR_DST) ? "MR: " : "NMR: ",
2580 libcfs_nid2str(sd->sd_dst_nid),
2581 (send_case & LOCAL_DST) ? "local" : "routed");
2583 switch (send_case) {
2585 * For all cases where the source is specified, we should always
2586 * use the destination NID, whether it's an MR destination or not,
2587 * since we're continuing a series of related messages for the
2590 case SRC_SPEC_LOCAL_NMR_DST:
2591 return lnet_handle_spec_local_nmr_dst(sd);
2592 case SRC_SPEC_LOCAL_MR_DST:
2593 return lnet_handle_spec_local_mr_dst(sd);
2594 case SRC_SPEC_ROUTER_NMR_DST:
2595 case SRC_SPEC_ROUTER_MR_DST:
2596 return lnet_handle_spec_router_dst(sd);
2597 case SRC_ANY_LOCAL_NMR_DST:
2598 return lnet_handle_any_local_nmr_dst(sd);
2599 case SRC_ANY_LOCAL_MR_DST:
2600 case SRC_ANY_ROUTER_MR_DST:
2601 return lnet_handle_any_mr_dst(sd);
2602 case SRC_ANY_ROUTER_NMR_DST:
2603 return lnet_handle_any_router_nmr_dst(sd);
2605 CERROR("Unknown send case\n");
2611 lnet_select_pathway(lnet_nid_t src_nid, lnet_nid_t dst_nid,
2612 struct lnet_msg *msg, lnet_nid_t rtr_nid)
2614 struct lnet_peer_ni *lpni;
2615 struct lnet_peer *peer;
2616 struct lnet_send_data send_data;
2619 __u32 send_case = 0;
2621 memset(&send_data, 0, sizeof(send_data));
2624 * get an initial CPT to use for locking. The idea here is not to
2625 * serialize the calls to select_pathway, so that as many
2626 * operations can run concurrently as possible. To do that we use
2627 * the CPT where this call is being executed. Later on when we
2628 * determine the CPT to use in lnet_message_commit, we switch the
2629 * lock and check if there was any configuration change. If none,
2630 * then we proceed, if there is, then we restart the operation.
2632 cpt = lnet_net_lock_current();
2634 md_cpt = lnet_cpt_of_md(msg->msg_md, msg->msg_offset);
2635 if (md_cpt == CFS_CPT_ANY)
2641 * If we're being asked to send to the loopback interface, there
2642 * is no need to go through any selection. We can just shortcut
2643 * the entire process and send over lolnd
2645 send_data.sd_msg = msg;
2646 send_data.sd_cpt = cpt;
2647 if (LNET_NETTYP(LNET_NIDNET(dst_nid)) == LOLND) {
2648 rc = lnet_handle_lo_send(&send_data);
2649 lnet_net_unlock(cpt);
2654 * find an existing peer_ni, or create one and mark it as having been
2655 * created due to network traffic. This call will create the
2656 * peer->peer_net->peer_ni tree.
2658 lpni = lnet_nid2peerni_locked(dst_nid, LNET_NID_ANY, cpt);
2660 lnet_net_unlock(cpt);
2661 return PTR_ERR(lpni);
2665 * Cache the original src_nid. If we need to resend the message
2666 * then we'll need to know whether the src_nid was originally
2667 * specified for this message. If it was originally specified,
2668 * then we need to keep using the same src_nid since it's
2669 * continuing the same sequence of messages.
2671 msg->msg_src_nid_param = src_nid;
2674 * Now that we have a peer_ni, check if we want to discover
2675 * the peer. Traffic to the LNET_RESERVED_PORTAL should not
2676 * trigger discovery.
2678 peer = lpni->lpni_peer_net->lpn_peer;
2679 rc = lnet_initiate_peer_discovery(lpni, msg, rtr_nid, cpt);
2681 lnet_peer_ni_decref_locked(lpni);
2682 lnet_net_unlock(cpt);
2685 lnet_peer_ni_decref_locked(lpni);
2688 * Identify the different send cases
2690 if (src_nid == LNET_NID_ANY)
2691 send_case |= SRC_ANY;
2693 send_case |= SRC_SPEC;
2695 if (lnet_get_net_locked(LNET_NIDNET(dst_nid)))
2696 send_case |= LOCAL_DST;
2698 send_case |= REMOTE_DST;
2701 * if this is a non-MR peer or if we're recovering a peer ni then
2702 * let's consider this an NMR case so we can hit the destination
2705 if (!lnet_peer_is_multi_rail(peer) || msg->msg_recovery)
2706 send_case |= NMR_DST;
2708 send_case |= MR_DST;
2710 if (msg->msg_type == LNET_MSG_REPLY ||
2711 msg->msg_type == LNET_MSG_ACK)
2712 send_case |= SND_RESP;
2714 /* assign parameters to the send_data */
2715 send_data.sd_rtr_nid = rtr_nid;
2716 send_data.sd_src_nid = src_nid;
2717 send_data.sd_dst_nid = dst_nid;
2718 send_data.sd_best_lpni = lpni;
2720 * keep a pointer to the final destination in case we're going to
2721 * route, so we'll need to access it later
2723 send_data.sd_final_dst_lpni = lpni;
2724 send_data.sd_peer = peer;
2725 send_data.sd_md_cpt = md_cpt;
2726 send_data.sd_send_case = send_case;
2728 rc = lnet_handle_send_case_locked(&send_data);
2731 * Update the local cpt since send_data.sd_cpt might've been
2732 * updated as a result of calling lnet_handle_send_case_locked().
2734 cpt = send_data.sd_cpt;
2736 if (rc == REPEAT_SEND)
2739 lnet_net_unlock(cpt);
2745 lnet_send(lnet_nid_t src_nid, struct lnet_msg *msg, lnet_nid_t rtr_nid)
2747 lnet_nid_t dst_nid = msg->msg_target.nid;
2751 * NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
2752 * but we might want to use pre-determined router for ACK/REPLY
2755 /* NB: ni != NULL == interface pre-determined (ACK/REPLY) */
2756 LASSERT(msg->msg_txpeer == NULL);
2757 LASSERT(msg->msg_txni == NULL);
2758 LASSERT(!msg->msg_sending);
2759 LASSERT(!msg->msg_target_is_router);
2760 LASSERT(!msg->msg_receiving);
2762 msg->msg_sending = 1;
2764 LASSERT(!msg->msg_tx_committed);
2766 rc = lnet_select_pathway(src_nid, dst_nid, msg, rtr_nid);
2768 if (rc == -EHOSTUNREACH)
2769 msg->msg_health_status = LNET_MSG_STATUS_REMOTE_ERROR;
2771 msg->msg_health_status = LNET_MSG_STATUS_LOCAL_ERROR;
2775 if (rc == LNET_CREDIT_OK)
2776 lnet_ni_send(msg->msg_txni, msg);
2778 /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT or LNET_DC_WAIT */
2782 enum lnet_mt_event_type {
2783 MT_TYPE_LOCAL_NI = 0,
2787 struct lnet_mt_event_info {
2788 enum lnet_mt_event_type mt_type;
2792 /* called with res_lock held */
2794 lnet_detach_rsp_tracker(struct lnet_libmd *md, int cpt)
2796 struct lnet_rsp_tracker *rspt;
2799 * msg has a refcount on the MD so the MD is not going away.
2800 * The rspt queue for the cpt is protected by
2801 * the lnet_net_lock(cpt). cpt is the cpt of the MD cookie.
2803 if (!md->md_rspt_ptr)
2806 rspt = md->md_rspt_ptr;
2809 LASSERT(rspt->rspt_cpt == cpt);
2811 md->md_rspt_ptr = NULL;
2813 if (LNetMDHandleIsInvalid(rspt->rspt_mdh)) {
2815 * The monitor thread has invalidated this handle because the
2816 * response timed out, but it failed to lookup the MD. That
2817 * means this response tracker is on the zombie list. We can
2818 * safely remove it under the resource lock (held by caller) and
2819 * free the response tracker block.
2821 list_del(&rspt->rspt_on_list);
2822 lnet_rspt_free(rspt, cpt);
2825 * invalidate the handle to indicate that a response has been
2826 * received, which will then lead the monitor thread to clean up
2829 LNetInvalidateMDHandle(&rspt->rspt_mdh);
2834 lnet_clean_zombie_rstqs(void)
2836 struct lnet_rsp_tracker *rspt, *tmp;
2839 cfs_cpt_for_each(i, lnet_cpt_table()) {
2840 list_for_each_entry_safe(rspt, tmp,
2841 the_lnet.ln_mt_zombie_rstqs[i],
2843 list_del(&rspt->rspt_on_list);
2844 lnet_rspt_free(rspt, i);
2848 cfs_percpt_free(the_lnet.ln_mt_zombie_rstqs);
2852 lnet_finalize_expired_responses(void)
2854 struct lnet_libmd *md;
2855 struct list_head local_queue;
2856 struct lnet_rsp_tracker *rspt, *tmp;
2860 if (the_lnet.ln_mt_rstq == NULL)
2863 cfs_cpt_for_each(i, lnet_cpt_table()) {
2864 INIT_LIST_HEAD(&local_queue);
2867 if (!the_lnet.ln_mt_rstq[i]) {
2871 list_splice_init(the_lnet.ln_mt_rstq[i], &local_queue);
2876 list_for_each_entry_safe(rspt, tmp, &local_queue, rspt_on_list) {
2878 * The rspt mdh will be invalidated when a response
2879 * is received or whenever we want to discard the
2880 * block the monitor thread will walk the queue
2881 * and clean up any rsts with an invalid mdh.
2882 * The monitor thread will walk the queue until
2883 * the first unexpired rspt block. This means that
2884 * some rspt blocks which received their
2885 * corresponding responses will linger in the
2886 * queue until they are cleaned up eventually.
2889 if (LNetMDHandleIsInvalid(rspt->rspt_mdh)) {
2891 list_del(&rspt->rspt_on_list);
2892 lnet_rspt_free(rspt, i);
2896 if (ktime_compare(now, rspt->rspt_deadline) >= 0 ||
2897 the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN) {
2898 struct lnet_peer_ni *lpni;
2901 md = lnet_handle2md(&rspt->rspt_mdh);
2903 /* MD has been queued for unlink, but
2904 * rspt hasn't been detached (Note we've
2905 * checked above that the rspt_mdh is
2906 * valid). Since we cannot lookup the MD
2907 * we're unable to detach the rspt
2908 * ourselves. Thus, move the rspt to the
2909 * zombie list where we'll wait for
2911 * 1. The remaining operations on the
2912 * MD to complete. In this case the
2913 * final operation will result in
2914 * lnet_msg_detach_md()->
2915 * lnet_detach_rsp_tracker() where
2916 * we will clean up this response
2918 * 2. LNet to shutdown. In this case
2919 * we'll wait until after all LND Nets
2920 * have shutdown and then we can
2921 * safely free any remaining response
2922 * tracker blocks on the zombie list.
2923 * Note: We need to hold the resource
2924 * lock when adding to the zombie list
2925 * because we may have concurrent access
2926 * with lnet_detach_rsp_tracker().
2928 LNetInvalidateMDHandle(&rspt->rspt_mdh);
2929 list_move(&rspt->rspt_on_list,
2930 the_lnet.ln_mt_zombie_rstqs[i]);
2934 LASSERT(md->md_rspt_ptr == rspt);
2935 md->md_rspt_ptr = NULL;
2938 LNetMDUnlink(rspt->rspt_mdh);
2940 nid = rspt->rspt_next_hop_nid;
2942 list_del(&rspt->rspt_on_list);
2943 lnet_rspt_free(rspt, i);
2945 /* If we're shutting down we just want to clean
2946 * up the rspt blocks
2948 if (the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN)
2952 the_lnet.ln_counters[i]->lct_health.lch_response_timeout_count++;
2956 "Response timeout: md = %p: nid = %s\n",
2957 md, libcfs_nid2str(nid));
2960 * If there is a timeout on the response
2961 * from the next hop decrement its health
2962 * value so that we don't use it
2965 lpni = lnet_find_peer_ni_locked(nid);
2967 lnet_handle_remote_failure_locked(lpni);
2968 lnet_peer_ni_decref_locked(lpni);
2977 if (!list_empty(&local_queue)) {
2979 list_splice(&local_queue, the_lnet.ln_mt_rstq[i]);
2986 lnet_resend_pending_msgs_locked(struct list_head *resendq, int cpt)
2988 struct lnet_msg *msg;
2990 while (!list_empty(resendq)) {
2991 struct lnet_peer_ni *lpni;
2993 msg = list_entry(resendq->next, struct lnet_msg,
2996 list_del_init(&msg->msg_list);
2998 lpni = lnet_find_peer_ni_locked(msg->msg_hdr.dest_nid);
3000 lnet_net_unlock(cpt);
3001 CERROR("Expected that a peer is already created for %s\n",
3002 libcfs_nid2str(msg->msg_hdr.dest_nid));
3003 msg->msg_no_resend = true;
3004 lnet_finalize(msg, -EFAULT);
3007 struct lnet_peer *peer;
3009 lnet_nid_t src_nid = LNET_NID_ANY;
3012 * if this message is not being routed and the
3013 * peer is non-MR then we must use the same
3014 * src_nid that was used in the original send.
3015 * Otherwise if we're routing the message (IE
3016 * we're a router) then we can use any of our
3017 * local interfaces. It doesn't matter to the
3018 * final destination.
3020 peer = lpni->lpni_peer_net->lpn_peer;
3021 if (!msg->msg_routing &&
3022 !lnet_peer_is_multi_rail(peer))
3023 src_nid = le64_to_cpu(msg->msg_hdr.src_nid);
3026 * If we originally specified a src NID, then we
3027 * must attempt to reuse it in the resend as well.
3029 if (msg->msg_src_nid_param != LNET_NID_ANY)
3030 src_nid = msg->msg_src_nid_param;
3031 lnet_peer_ni_decref_locked(lpni);
3033 lnet_net_unlock(cpt);
3034 CDEBUG(D_NET, "resending %s->%s: %s recovery %d try# %d\n",
3035 libcfs_nid2str(src_nid),
3036 libcfs_id2str(msg->msg_target),
3037 lnet_msgtyp2str(msg->msg_type),
3039 msg->msg_retry_count);
3040 rc = lnet_send(src_nid, msg, LNET_NID_ANY);
3042 CERROR("Error sending %s to %s: %d\n",
3043 lnet_msgtyp2str(msg->msg_type),
3044 libcfs_id2str(msg->msg_target), rc);
3045 msg->msg_no_resend = true;
3046 lnet_finalize(msg, rc);
3050 the_lnet.ln_counters[cpt]->lct_health.lch_resend_count++;
3056 lnet_resend_pending_msgs(void)
3060 cfs_cpt_for_each(i, lnet_cpt_table()) {
3062 lnet_resend_pending_msgs_locked(the_lnet.ln_mt_resendqs[i], i);
3067 /* called with cpt and ni_lock held */
3069 lnet_unlink_ni_recovery_mdh_locked(struct lnet_ni *ni, int cpt, bool force)
3071 struct lnet_handle_md recovery_mdh;
3073 LNetInvalidateMDHandle(&recovery_mdh);
3075 if (ni->ni_recovery_state & LNET_NI_RECOVERY_PENDING ||
3077 recovery_mdh = ni->ni_ping_mdh;
3078 LNetInvalidateMDHandle(&ni->ni_ping_mdh);
3081 lnet_net_unlock(cpt);
3082 if (!LNetMDHandleIsInvalid(recovery_mdh))
3083 LNetMDUnlink(recovery_mdh);
3089 lnet_recover_local_nis(void)
3091 struct lnet_mt_event_info *ev_info;
3092 struct list_head processed_list;
3093 struct list_head local_queue;
3094 struct lnet_handle_md mdh;
3095 struct lnet_ni *tmp;
3101 INIT_LIST_HEAD(&local_queue);
3102 INIT_LIST_HEAD(&processed_list);
3105 * splice the recovery queue on a local queue. We will iterate
3106 * through the local queue and update it as needed. Once we're
3107 * done with the traversal, we'll splice the local queue back on
3108 * the head of the ln_mt_localNIRecovq. Any newly added local NIs
3109 * will be traversed in the next iteration.
3112 list_splice_init(&the_lnet.ln_mt_localNIRecovq,
3116 list_for_each_entry_safe(ni, tmp, &local_queue, ni_recovery) {
3118 * if an NI is being deleted or it is now healthy, there
3119 * is no need to keep it around in the recovery queue.
3120 * The monitor thread is the only thread responsible for
3121 * removing the NI from the recovery queue.
3122 * Multiple threads can be adding NIs to the recovery
3125 healthv = atomic_read(&ni->ni_healthv);
3129 if (ni->ni_state != LNET_NI_STATE_ACTIVE ||
3130 healthv == LNET_MAX_HEALTH_VALUE) {
3131 list_del_init(&ni->ni_recovery);
3132 lnet_unlink_ni_recovery_mdh_locked(ni, 0, false);
3134 lnet_ni_decref_locked(ni, 0);
3140 * if the local NI failed recovery we must unlink the md.
3141 * But we want to keep the local_ni on the recovery queue
3142 * so we can continue the attempts to recover it.
3144 if (ni->ni_recovery_state & LNET_NI_RECOVERY_FAILED) {
3145 lnet_unlink_ni_recovery_mdh_locked(ni, 0, true);
3146 ni->ni_recovery_state &= ~LNET_NI_RECOVERY_FAILED;
3153 CDEBUG(D_NET, "attempting to recover local ni: %s\n",
3154 libcfs_nid2str(ni->ni_nid));
3157 if (!(ni->ni_recovery_state & LNET_NI_RECOVERY_PENDING)) {
3158 ni->ni_recovery_state |= LNET_NI_RECOVERY_PENDING;
3161 LIBCFS_ALLOC(ev_info, sizeof(*ev_info));
3163 CERROR("out of memory. Can't recover %s\n",
3164 libcfs_nid2str(ni->ni_nid));
3166 ni->ni_recovery_state &=
3167 ~LNET_NI_RECOVERY_PENDING;
3172 mdh = ni->ni_ping_mdh;
3174 * Invalidate the ni mdh in case it's deleted.
3175 * We'll unlink the mdh in this case below.
3177 LNetInvalidateMDHandle(&ni->ni_ping_mdh);
3181 * remove the NI from the local queue and drop the
3182 * reference count to it while we're recovering
3183 * it. The reason for that, is that the NI could
3184 * be deleted, and the way the code is structured
3185 * is if we don't drop the NI, then the deletion
3186 * code will enter a loop waiting for the
3187 * reference count to be removed while holding the
3188 * ln_mutex_lock(). When we look up the peer to
3189 * send to in lnet_select_pathway() we will try to
3190 * lock the ln_mutex_lock() as well, leading to
3191 * a deadlock. By dropping the refcount and
3192 * removing it from the list, we allow for the NI
3193 * to be removed, then we use the cached NID to
3194 * look it up again. If it's gone, then we just
3195 * continue examining the rest of the queue.
3198 list_del_init(&ni->ni_recovery);
3199 lnet_ni_decref_locked(ni, 0);
3202 ev_info->mt_type = MT_TYPE_LOCAL_NI;
3203 ev_info->mt_nid = nid;
3204 rc = lnet_send_ping(nid, &mdh, LNET_INTERFACES_MIN,
3205 ev_info, the_lnet.ln_mt_eqh, true);
3206 /* lookup the nid again */
3208 ni = lnet_nid2ni_locked(nid, 0);
3211 * the NI has been deleted when we dropped
3219 * Same note as in lnet_recover_peer_nis(). When
3220 * we're sending the ping, the NI is free to be
3221 * deleted or manipulated. By this point it
3222 * could've been added back on the recovery queue,
3223 * and a refcount taken on it.
3224 * So we can't just add it blindly again or we'll
3225 * corrupt the queue. We must check under lock if
3226 * it's not on any list and if not then add it
3227 * to the processed list, which will eventually be
3228 * spliced back on to the recovery queue.
3230 ni->ni_ping_mdh = mdh;
3231 if (list_empty(&ni->ni_recovery)) {
3232 list_add_tail(&ni->ni_recovery, &processed_list);
3233 lnet_ni_addref_locked(ni, 0);
3239 ni->ni_recovery_state &= ~LNET_NI_RECOVERY_PENDING;
3245 * put back the remaining NIs on the ln_mt_localNIRecovq to be
3246 * reexamined in the next iteration.
3248 list_splice_init(&processed_list, &local_queue);
3250 list_splice(&local_queue, &the_lnet.ln_mt_localNIRecovq);
3255 lnet_resendqs_create(void)
3257 struct list_head **resendqs;
3258 resendqs = lnet_create_array_of_queues();
3263 lnet_net_lock(LNET_LOCK_EX);
3264 the_lnet.ln_mt_resendqs = resendqs;
3265 lnet_net_unlock(LNET_LOCK_EX);
3271 lnet_clean_local_ni_recoveryq(void)
3275 /* This is only called when the monitor thread has stopped */
3278 while (!list_empty(&the_lnet.ln_mt_localNIRecovq)) {
3279 ni = list_entry(the_lnet.ln_mt_localNIRecovq.next,
3280 struct lnet_ni, ni_recovery);
3281 list_del_init(&ni->ni_recovery);
3283 lnet_unlink_ni_recovery_mdh_locked(ni, 0, true);
3285 lnet_ni_decref_locked(ni, 0);
3292 lnet_unlink_lpni_recovery_mdh_locked(struct lnet_peer_ni *lpni, int cpt,
3295 struct lnet_handle_md recovery_mdh;
3297 LNetInvalidateMDHandle(&recovery_mdh);
3299 if (lpni->lpni_state & LNET_PEER_NI_RECOVERY_PENDING || force) {
3300 recovery_mdh = lpni->lpni_recovery_ping_mdh;
3301 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
3303 spin_unlock(&lpni->lpni_lock);
3304 lnet_net_unlock(cpt);
3305 if (!LNetMDHandleIsInvalid(recovery_mdh))
3306 LNetMDUnlink(recovery_mdh);
3308 spin_lock(&lpni->lpni_lock);
3312 lnet_clean_peer_ni_recoveryq(void)
3314 struct lnet_peer_ni *lpni, *tmp;
3316 lnet_net_lock(LNET_LOCK_EX);
3318 list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_mt_peerNIRecovq,
3320 list_del_init(&lpni->lpni_recovery);
3321 spin_lock(&lpni->lpni_lock);
3322 lnet_unlink_lpni_recovery_mdh_locked(lpni, LNET_LOCK_EX, true);
3323 spin_unlock(&lpni->lpni_lock);
3324 lnet_peer_ni_decref_locked(lpni);
3327 lnet_net_unlock(LNET_LOCK_EX);
3331 lnet_clean_resendqs(void)
3333 struct lnet_msg *msg, *tmp;
3334 struct list_head msgs;
3337 INIT_LIST_HEAD(&msgs);
3339 cfs_cpt_for_each(i, lnet_cpt_table()) {
3341 list_splice_init(the_lnet.ln_mt_resendqs[i], &msgs);
3343 list_for_each_entry_safe(msg, tmp, &msgs, msg_list) {
3344 list_del_init(&msg->msg_list);
3345 msg->msg_no_resend = true;
3346 lnet_finalize(msg, -ESHUTDOWN);
3350 cfs_percpt_free(the_lnet.ln_mt_resendqs);
3354 lnet_recover_peer_nis(void)
3356 struct lnet_mt_event_info *ev_info;
3357 struct list_head processed_list;
3358 struct list_head local_queue;
3359 struct lnet_handle_md mdh;
3360 struct lnet_peer_ni *lpni;
3361 struct lnet_peer_ni *tmp;
3366 INIT_LIST_HEAD(&local_queue);
3367 INIT_LIST_HEAD(&processed_list);
3370 * Always use cpt 0 for locking across all interactions with
3371 * ln_mt_peerNIRecovq
3374 list_splice_init(&the_lnet.ln_mt_peerNIRecovq,
3378 list_for_each_entry_safe(lpni, tmp, &local_queue,
3381 * The same protection strategy is used here as is in the
3382 * local recovery case.
3385 healthv = atomic_read(&lpni->lpni_healthv);
3386 spin_lock(&lpni->lpni_lock);
3387 if (lpni->lpni_state & LNET_PEER_NI_DELETING ||
3388 healthv == LNET_MAX_HEALTH_VALUE) {
3389 list_del_init(&lpni->lpni_recovery);
3390 lnet_unlink_lpni_recovery_mdh_locked(lpni, 0, false);
3391 spin_unlock(&lpni->lpni_lock);
3392 lnet_peer_ni_decref_locked(lpni);
3398 * If the peer NI has failed recovery we must unlink the
3399 * md. But we want to keep the peer ni on the recovery
3400 * queue so we can try to continue recovering it
3402 if (lpni->lpni_state & LNET_PEER_NI_RECOVERY_FAILED) {
3403 lnet_unlink_lpni_recovery_mdh_locked(lpni, 0, true);
3404 lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_FAILED;
3407 spin_unlock(&lpni->lpni_lock);
3411 * NOTE: we're racing with peer deletion from user space.
3412 * It's possible that a peer is deleted after we check its
3413 * state. In this case the recovery can create a new peer
3415 spin_lock(&lpni->lpni_lock);
3416 if (!(lpni->lpni_state & LNET_PEER_NI_RECOVERY_PENDING) &&
3417 !(lpni->lpni_state & LNET_PEER_NI_DELETING)) {
3418 lpni->lpni_state |= LNET_PEER_NI_RECOVERY_PENDING;
3419 spin_unlock(&lpni->lpni_lock);
3421 LIBCFS_ALLOC(ev_info, sizeof(*ev_info));
3423 CERROR("out of memory. Can't recover %s\n",
3424 libcfs_nid2str(lpni->lpni_nid));
3425 spin_lock(&lpni->lpni_lock);
3426 lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
3427 spin_unlock(&lpni->lpni_lock);
3431 /* look at the comments in lnet_recover_local_nis() */
3432 mdh = lpni->lpni_recovery_ping_mdh;
3433 LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
3434 nid = lpni->lpni_nid;
3436 list_del_init(&lpni->lpni_recovery);
3437 lnet_peer_ni_decref_locked(lpni);
3440 ev_info->mt_type = MT_TYPE_PEER_NI;
3441 ev_info->mt_nid = nid;
3442 rc = lnet_send_ping(nid, &mdh, LNET_INTERFACES_MIN,
3443 ev_info, the_lnet.ln_mt_eqh, true);
3446 * lnet_find_peer_ni_locked() grabs a refcount for
3447 * us. No need to take it explicitly.
3449 lpni = lnet_find_peer_ni_locked(nid);
3456 lpni->lpni_recovery_ping_mdh = mdh;
3458 * While we're unlocked the lpni could've been
3459 * readded on the recovery queue. In this case we
3460 * don't need to add it to the local queue, since
3461 * it's already on there and the thread that added
3462 * it would've incremented the refcount on the
3463 * peer, which means we need to decref the refcount
3464 * that was implicitly grabbed by find_peer_ni_locked.
3465 * Otherwise, if the lpni is still not on
3466 * the recovery queue, then we'll add it to the
3469 if (list_empty(&lpni->lpni_recovery))
3470 list_add_tail(&lpni->lpni_recovery, &processed_list);
3472 lnet_peer_ni_decref_locked(lpni);
3475 spin_lock(&lpni->lpni_lock);
3477 lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
3479 spin_unlock(&lpni->lpni_lock);
3482 list_splice_init(&processed_list, &local_queue);
3484 list_splice(&local_queue, &the_lnet.ln_mt_peerNIRecovq);
3489 lnet_monitor_thread(void *arg)
3491 time64_t recovery_timeout = 0;
3492 time64_t rsp_timeout = 0;
3496 wait_for_completion(&the_lnet.ln_started);
3498 * The monitor thread takes care of the following:
3499 * 1. Checks the aliveness of routers
3500 * 2. Checks if there are messages on the resend queue to resend
3502 * 3. Check if there are any NIs on the local recovery queue and
3504 * 4. Checks if there are any NIs on the remote recovery queue
3507 cfs_block_allsigs();
3509 while (the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING) {
3510 now = ktime_get_real_seconds();
3512 if (lnet_router_checker_active())
3513 lnet_check_routers();
3515 lnet_resend_pending_msgs();
3517 if (now >= rsp_timeout) {
3518 lnet_finalize_expired_responses();
3519 rsp_timeout = now + (lnet_transaction_timeout / 2);
3522 if (now >= recovery_timeout) {
3523 lnet_recover_local_nis();
3524 lnet_recover_peer_nis();
3525 recovery_timeout = now + lnet_recovery_interval;
3529 * TODO do we need to check if we should sleep without
3530 * timeout? Technically, an active system will always
3531 * have messages in flight so this check will always
3532 * evaluate to false. And on an idle system do we care
3533 * if we wake up every 1 second? Although, we've seen
3534 * cases where we get a complaint that an idle thread
3535 * is waking up unnecessarily.
3537 * Take into account the current net_count when you wake
3538 * up for alive router checking, since we need to check
3539 * possibly as many networks as we have configured.
3541 interval = min(lnet_recovery_interval,
3542 min((unsigned int) alive_router_check_interval /
3543 lnet_current_net_count,
3544 lnet_transaction_timeout / 2));
3545 wait_event_interruptible_timeout(the_lnet.ln_mt_waitq,
3547 cfs_time_seconds(interval));
3551 lnet_net_lock(LNET_LOCK_EX);
3552 the_lnet.ln_mt_state = LNET_MT_STATE_SHUTDOWN;
3553 lnet_net_unlock(LNET_LOCK_EX);
3555 /* signal that the monitor thread is exiting */
3556 up(&the_lnet.ln_mt_signal);
3564 * Returns == 0 if success
3565 * Returns > 0 if LNetMDBind or prior fails
3566 * Returns < 0 if LNetGet fails
3569 lnet_send_ping(lnet_nid_t dest_nid,
3570 struct lnet_handle_md *mdh, int nnis,
3571 void *user_data, struct lnet_handle_eq eqh, bool recovery)
3573 struct lnet_md md = { NULL };
3574 struct lnet_process_id id;
3575 struct lnet_ping_buffer *pbuf;
3578 if (dest_nid == LNET_NID_ANY) {
3583 pbuf = lnet_ping_buffer_alloc(nnis, GFP_NOFS);
3589 /* initialize md content */
3590 md.start = &pbuf->pb_info;
3591 md.length = LNET_PING_INFO_SIZE(nnis);
3592 md.threshold = 2; /* GET/REPLY */
3594 md.options = LNET_MD_TRUNCATE;
3595 md.user_ptr = user_data;
3598 rc = LNetMDBind(md, LNET_UNLINK, mdh);
3600 lnet_ping_buffer_decref(pbuf);
3601 CERROR("Can't bind MD: %d\n", rc);
3602 rc = -rc; /* change the rc to positive */
3605 id.pid = LNET_PID_LUSTRE;
3608 rc = LNetGet(LNET_NID_ANY, *mdh, id,
3609 LNET_RESERVED_PORTAL,
3610 LNET_PROTO_PING_MATCHBITS, 0, recovery);
3613 goto fail_unlink_md;
3619 LNetInvalidateMDHandle(mdh);
3625 lnet_handle_recovery_reply(struct lnet_mt_event_info *ev_info,
3626 int status, bool unlink_event)
3628 lnet_nid_t nid = ev_info->mt_nid;
3630 if (ev_info->mt_type == MT_TYPE_LOCAL_NI) {
3634 ni = lnet_nid2ni_locked(nid, 0);
3640 ni->ni_recovery_state &= ~LNET_NI_RECOVERY_PENDING;
3642 ni->ni_recovery_state |= LNET_NI_RECOVERY_FAILED;
3647 CERROR("local NI (%s) recovery failed with %d\n",
3648 libcfs_nid2str(nid), status);
3652 * need to increment healthv for the ni here, because in
3653 * the lnet_finalize() path we don't have access to this
3654 * NI. And in order to get access to it, we'll need to
3655 * carry forward too much information.
3656 * In the peer case, it'll naturally be incremented
3659 lnet_inc_healthv(&ni->ni_healthv);
3661 struct lnet_peer_ni *lpni;
3664 cpt = lnet_net_lock_current();
3665 lpni = lnet_find_peer_ni_locked(nid);
3667 lnet_net_unlock(cpt);
3670 spin_lock(&lpni->lpni_lock);
3671 lpni->lpni_state &= ~LNET_PEER_NI_RECOVERY_PENDING;
3673 lpni->lpni_state |= LNET_PEER_NI_RECOVERY_FAILED;
3674 spin_unlock(&lpni->lpni_lock);
3675 lnet_peer_ni_decref_locked(lpni);
3676 lnet_net_unlock(cpt);
3679 CERROR("peer NI (%s) recovery failed with %d\n",
3680 libcfs_nid2str(nid), status);
3685 lnet_mt_event_handler(struct lnet_event *event)
3687 struct lnet_mt_event_info *ev_info = event->md.user_ptr;
3688 struct lnet_ping_buffer *pbuf;
3690 /* TODO: remove assert */
3691 LASSERT(event->type == LNET_EVENT_REPLY ||
3692 event->type == LNET_EVENT_SEND ||
3693 event->type == LNET_EVENT_UNLINK);
3695 CDEBUG(D_NET, "Received event: %d status: %d\n", event->type,
3698 switch (event->type) {
3699 case LNET_EVENT_UNLINK:
3700 CDEBUG(D_NET, "%s recovery ping unlinked\n",
3701 libcfs_nid2str(ev_info->mt_nid));
3703 case LNET_EVENT_REPLY:
3704 lnet_handle_recovery_reply(ev_info, event->status,
3705 event->type == LNET_EVENT_UNLINK);
3707 case LNET_EVENT_SEND:
3708 CDEBUG(D_NET, "%s recovery message sent %s:%d\n",
3709 libcfs_nid2str(ev_info->mt_nid),
3710 (event->status) ? "unsuccessfully" :
3711 "successfully", event->status);
3714 CERROR("Unexpected event: %d\n", event->type);
3717 if (event->unlinked) {
3718 LIBCFS_FREE(ev_info, sizeof(*ev_info));
3719 pbuf = LNET_PING_INFO_TO_BUFFER(event->md.start);
3720 lnet_ping_buffer_decref(pbuf);
3725 lnet_rsp_tracker_create(void)
3727 struct list_head **rstqs;
3728 rstqs = lnet_create_array_of_queues();
3733 the_lnet.ln_mt_rstq = rstqs;
3739 lnet_rsp_tracker_clean(void)
3741 lnet_finalize_expired_responses();
3743 cfs_percpt_free(the_lnet.ln_mt_rstq);
3744 the_lnet.ln_mt_rstq = NULL;
3747 int lnet_monitor_thr_start(void)
3750 struct task_struct *task;
3752 if (the_lnet.ln_mt_state != LNET_MT_STATE_SHUTDOWN)
3755 rc = lnet_resendqs_create();
3759 rc = lnet_rsp_tracker_create();
3763 sema_init(&the_lnet.ln_mt_signal, 0);
3765 lnet_net_lock(LNET_LOCK_EX);
3766 the_lnet.ln_mt_state = LNET_MT_STATE_RUNNING;
3767 lnet_net_unlock(LNET_LOCK_EX);
3768 task = kthread_run(lnet_monitor_thread, NULL, "monitor_thread");
3771 CERROR("Can't start monitor thread: %d\n", rc);
3778 lnet_net_lock(LNET_LOCK_EX);
3779 the_lnet.ln_mt_state = LNET_MT_STATE_STOPPING;
3780 lnet_net_unlock(LNET_LOCK_EX);
3781 /* block until event callback signals exit */
3782 down(&the_lnet.ln_mt_signal);
3784 lnet_net_lock(LNET_LOCK_EX);
3785 the_lnet.ln_mt_state = LNET_MT_STATE_SHUTDOWN;
3786 lnet_net_unlock(LNET_LOCK_EX);
3787 lnet_rsp_tracker_clean();
3788 lnet_clean_local_ni_recoveryq();
3789 lnet_clean_peer_ni_recoveryq();
3790 lnet_clean_resendqs();
3791 LNetInvalidateEQHandle(&the_lnet.ln_mt_eqh);
3794 lnet_rsp_tracker_clean();
3795 lnet_clean_local_ni_recoveryq();
3796 lnet_clean_peer_ni_recoveryq();
3797 lnet_clean_resendqs();
3801 void lnet_monitor_thr_stop(void)
3803 if (the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN)
3806 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
3807 lnet_net_lock(LNET_LOCK_EX);
3808 the_lnet.ln_mt_state = LNET_MT_STATE_STOPPING;
3809 lnet_net_unlock(LNET_LOCK_EX);
3811 /* tell the monitor thread that we're shutting down */
3812 wake_up(&the_lnet.ln_mt_waitq);
3814 /* block until monitor thread signals that it's done */
3815 down(&the_lnet.ln_mt_signal);
3816 LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_SHUTDOWN);
3818 /* perform cleanup tasks */
3819 lnet_rsp_tracker_clean();
3820 lnet_clean_local_ni_recoveryq();
3821 lnet_clean_peer_ni_recoveryq();
3822 lnet_clean_resendqs();
3828 lnet_drop_message(struct lnet_ni *ni, int cpt, void *private, unsigned int nob,
3832 lnet_incr_stats(&ni->ni_stats, msg_type, LNET_STATS_TYPE_DROP);
3833 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
3834 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length += nob;
3835 lnet_net_unlock(cpt);
3837 lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
3841 lnet_recv_put(struct lnet_ni *ni, struct lnet_msg *msg)
3843 struct lnet_hdr *hdr = &msg->msg_hdr;
3845 if (msg->msg_wanted != 0)
3846 lnet_setpayloadbuffer(msg);
3848 lnet_build_msg_event(msg, LNET_EVENT_PUT);
3850 /* Must I ACK? If so I'll grab the ack_wmd out of the header and put
3851 * it back into the ACK during lnet_finalize() */
3852 msg->msg_ack = (!lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
3853 (msg->msg_md->md_options & LNET_MD_ACK_DISABLE) == 0);
3855 lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
3856 msg->msg_offset, msg->msg_wanted, hdr->payload_length);
3860 lnet_parse_put(struct lnet_ni *ni, struct lnet_msg *msg)
3862 struct lnet_hdr *hdr = &msg->msg_hdr;
3863 struct lnet_match_info info;
3867 /* Convert put fields to host byte order */
3868 hdr->msg.put.match_bits = le64_to_cpu(hdr->msg.put.match_bits);
3869 hdr->msg.put.ptl_index = le32_to_cpu(hdr->msg.put.ptl_index);
3870 hdr->msg.put.offset = le32_to_cpu(hdr->msg.put.offset);
3872 /* Primary peer NID. */
3873 info.mi_id.nid = msg->msg_initiator;
3874 info.mi_id.pid = hdr->src_pid;
3875 info.mi_opc = LNET_MD_OP_PUT;
3876 info.mi_portal = hdr->msg.put.ptl_index;
3877 info.mi_rlength = hdr->payload_length;
3878 info.mi_roffset = hdr->msg.put.offset;
3879 info.mi_mbits = hdr->msg.put.match_bits;
3880 info.mi_cpt = lnet_cpt_of_nid(msg->msg_initiator, ni);
3882 msg->msg_rx_ready_delay = ni->ni_net->net_lnd->lnd_eager_recv == NULL;
3883 ready_delay = msg->msg_rx_ready_delay;
3886 rc = lnet_ptl_match_md(&info, msg);
3891 case LNET_MATCHMD_OK:
3892 lnet_recv_put(ni, msg);
3895 case LNET_MATCHMD_NONE:
3897 /* no eager_recv or has already called it, should
3898 * have been attached on delayed list */
3901 rc = lnet_ni_eager_recv(ni, msg);
3908 case LNET_MATCHMD_DROP:
3909 CNETERR("Dropping PUT from %s portal %d match %llu"
3910 " offset %d length %d: %d\n",
3911 libcfs_id2str(info.mi_id), info.mi_portal,
3912 info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
3914 return -ENOENT; /* -ve: OK but no match */
3919 lnet_parse_get(struct lnet_ni *ni, struct lnet_msg *msg, int rdma_get)
3921 struct lnet_match_info info;
3922 struct lnet_hdr *hdr = &msg->msg_hdr;
3923 struct lnet_process_id source_id;
3924 struct lnet_handle_wire reply_wmd;
3927 /* Convert get fields to host byte order */
3928 hdr->msg.get.match_bits = le64_to_cpu(hdr->msg.get.match_bits);
3929 hdr->msg.get.ptl_index = le32_to_cpu(hdr->msg.get.ptl_index);
3930 hdr->msg.get.sink_length = le32_to_cpu(hdr->msg.get.sink_length);
3931 hdr->msg.get.src_offset = le32_to_cpu(hdr->msg.get.src_offset);
3933 source_id.nid = hdr->src_nid;
3934 source_id.pid = hdr->src_pid;
3935 /* Primary peer NID */
3936 info.mi_id.nid = msg->msg_initiator;
3937 info.mi_id.pid = hdr->src_pid;
3938 info.mi_opc = LNET_MD_OP_GET;
3939 info.mi_portal = hdr->msg.get.ptl_index;
3940 info.mi_rlength = hdr->msg.get.sink_length;
3941 info.mi_roffset = hdr->msg.get.src_offset;
3942 info.mi_mbits = hdr->msg.get.match_bits;
3943 info.mi_cpt = lnet_cpt_of_nid(msg->msg_initiator, ni);
3945 rc = lnet_ptl_match_md(&info, msg);
3946 if (rc == LNET_MATCHMD_DROP) {
3947 CNETERR("Dropping GET from %s portal %d match %llu"
3948 " offset %d length %d\n",
3949 libcfs_id2str(info.mi_id), info.mi_portal,
3950 info.mi_mbits, info.mi_roffset, info.mi_rlength);
3951 return -ENOENT; /* -ve: OK but no match */
3954 LASSERT(rc == LNET_MATCHMD_OK);
3956 lnet_build_msg_event(msg, LNET_EVENT_GET);
3958 reply_wmd = hdr->msg.get.return_wmd;
3960 lnet_prep_send(msg, LNET_MSG_REPLY, source_id,
3961 msg->msg_offset, msg->msg_wanted);
3963 msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
3966 /* The LND completes the REPLY from her recv procedure */
3967 lnet_ni_recv(ni, msg->msg_private, msg, 0,
3968 msg->msg_offset, msg->msg_len, msg->msg_len);
3972 lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
3973 msg->msg_receiving = 0;
3975 rc = lnet_send(ni->ni_nid, msg, msg->msg_from);
3977 /* didn't get as far as lnet_ni_send() */
3978 CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
3979 libcfs_nid2str(ni->ni_nid),
3980 libcfs_id2str(info.mi_id), rc);
3982 lnet_finalize(msg, rc);
3989 lnet_parse_reply(struct lnet_ni *ni, struct lnet_msg *msg)
3991 void *private = msg->msg_private;
3992 struct lnet_hdr *hdr = &msg->msg_hdr;
3993 struct lnet_process_id src = {0};
3994 struct lnet_libmd *md;
3999 cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
4002 src.nid = hdr->src_nid;
4003 src.pid = hdr->src_pid;
4005 /* NB handles only looked up by creator (no flips) */
4006 md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
4007 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
4008 CNETERR("%s: Dropping REPLY from %s for %s "
4010 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
4011 (md == NULL) ? "invalid" : "inactive",
4012 hdr->msg.reply.dst_wmd.wh_interface_cookie,
4013 hdr->msg.reply.dst_wmd.wh_object_cookie);
4014 if (md != NULL && md->md_me != NULL)
4015 CERROR("REPLY MD also attached to portal %d\n",
4016 md->md_me->me_portal);
4018 lnet_res_unlock(cpt);
4019 return -ENOENT; /* -ve: OK but no match */
4022 LASSERT(md->md_offset == 0);
4024 rlength = hdr->payload_length;
4025 mlength = MIN(rlength, (int)md->md_length);
4027 if (mlength < rlength &&
4028 (md->md_options & LNET_MD_TRUNCATE) == 0) {
4029 CNETERR("%s: Dropping REPLY from %s length %d "
4030 "for MD %#llx would overflow (%d)\n",
4031 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
4032 rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
4034 lnet_res_unlock(cpt);
4035 return -ENOENT; /* -ve: OK but no match */
4038 CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n",
4039 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
4040 mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
4042 lnet_msg_attach_md(msg, md, 0, mlength);
4045 lnet_setpayloadbuffer(msg);
4047 lnet_res_unlock(cpt);
4049 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
4051 lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
4056 lnet_parse_ack(struct lnet_ni *ni, struct lnet_msg *msg)
4058 struct lnet_hdr *hdr = &msg->msg_hdr;
4059 struct lnet_process_id src = {0};
4060 struct lnet_libmd *md;
4063 src.nid = hdr->src_nid;
4064 src.pid = hdr->src_pid;
4066 /* Convert ack fields to host byte order */
4067 hdr->msg.ack.match_bits = le64_to_cpu(hdr->msg.ack.match_bits);
4068 hdr->msg.ack.mlength = le32_to_cpu(hdr->msg.ack.mlength);
4070 cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
4073 /* NB handles only looked up by creator (no flips) */
4074 md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
4075 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
4076 /* Don't moan; this is expected */
4078 "%s: Dropping ACK from %s to %s MD %#llx.%#llx\n",
4079 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
4080 (md == NULL) ? "invalid" : "inactive",
4081 hdr->msg.ack.dst_wmd.wh_interface_cookie,
4082 hdr->msg.ack.dst_wmd.wh_object_cookie);
4083 if (md != NULL && md->md_me != NULL)
4084 CERROR("Source MD also attached to portal %d\n",
4085 md->md_me->me_portal);
4087 lnet_res_unlock(cpt);
4088 return -ENOENT; /* -ve! */
4091 CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n",
4092 libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
4093 hdr->msg.ack.dst_wmd.wh_object_cookie);
4095 lnet_msg_attach_md(msg, md, 0, 0);
4097 lnet_res_unlock(cpt);
4099 lnet_build_msg_event(msg, LNET_EVENT_ACK);
4101 lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
4106 * \retval LNET_CREDIT_OK If \a msg is forwarded
4107 * \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
4108 * \retval -ve error code
4111 lnet_parse_forward_locked(struct lnet_ni *ni, struct lnet_msg *msg)
4115 if (!the_lnet.ln_routing)
4118 if (msg->msg_rxpeer->lpni_rtrcredits <= 0 ||
4119 lnet_msg2bufpool(msg)->rbp_credits <= 0) {
4120 if (ni->ni_net->net_lnd->lnd_eager_recv == NULL) {
4121 msg->msg_rx_ready_delay = 1;
4123 lnet_net_unlock(msg->msg_rx_cpt);
4124 rc = lnet_ni_eager_recv(ni, msg);
4125 lnet_net_lock(msg->msg_rx_cpt);
4130 rc = lnet_post_routed_recv_locked(msg, 0);
4135 lnet_parse_local(struct lnet_ni *ni, struct lnet_msg *msg)
4139 switch (msg->msg_type) {
4141 rc = lnet_parse_ack(ni, msg);
4144 rc = lnet_parse_put(ni, msg);
4147 rc = lnet_parse_get(ni, msg, msg->msg_rdma_get);
4149 case LNET_MSG_REPLY:
4150 rc = lnet_parse_reply(ni, msg);
4152 default: /* prevent an unused label if !kernel */
4157 LASSERT(rc == 0 || rc == -ENOENT);
4162 lnet_msgtyp2str (int type)
4171 case LNET_MSG_REPLY:
4173 case LNET_MSG_HELLO:
4176 return ("<UNKNOWN>");
4181 lnet_print_hdr(struct lnet_hdr *hdr)
4183 struct lnet_process_id src = {
4184 .nid = hdr->src_nid,
4185 .pid = hdr->src_pid,
4187 struct lnet_process_id dst = {
4188 .nid = hdr->dest_nid,
4189 .pid = hdr->dest_pid,
4191 char *type_str = lnet_msgtyp2str(hdr->type);
4193 CWARN("P3 Header at %p of type %s\n", hdr, type_str);
4194 CWARN(" From %s\n", libcfs_id2str(src));
4195 CWARN(" To %s\n", libcfs_id2str(dst));
4197 switch (hdr->type) {
4202 CWARN(" Ptl index %d, ack md %#llx.%#llx, "
4203 "match bits %llu\n",
4204 hdr->msg.put.ptl_index,
4205 hdr->msg.put.ack_wmd.wh_interface_cookie,
4206 hdr->msg.put.ack_wmd.wh_object_cookie,
4207 hdr->msg.put.match_bits);
4208 CWARN(" Length %d, offset %d, hdr data %#llx\n",
4209 hdr->payload_length, hdr->msg.put.offset,
4210 hdr->msg.put.hdr_data);
4214 CWARN(" Ptl index %d, return md %#llx.%#llx, "
4215 "match bits %llu\n", hdr->msg.get.ptl_index,
4216 hdr->msg.get.return_wmd.wh_interface_cookie,
4217 hdr->msg.get.return_wmd.wh_object_cookie,
4218 hdr->msg.get.match_bits);
4219 CWARN(" Length %d, src offset %d\n",
4220 hdr->msg.get.sink_length,
4221 hdr->msg.get.src_offset);
4225 CWARN(" dst md %#llx.%#llx, "
4226 "manipulated length %d\n",
4227 hdr->msg.ack.dst_wmd.wh_interface_cookie,
4228 hdr->msg.ack.dst_wmd.wh_object_cookie,
4229 hdr->msg.ack.mlength);
4232 case LNET_MSG_REPLY:
4233 CWARN(" dst md %#llx.%#llx, "
4235 hdr->msg.reply.dst_wmd.wh_interface_cookie,
4236 hdr->msg.reply.dst_wmd.wh_object_cookie,
4237 hdr->payload_length);
4243 lnet_parse(struct lnet_ni *ni, struct lnet_hdr *hdr, lnet_nid_t from_nid,
4244 void *private, int rdma_req)
4246 struct lnet_peer_ni *lpni;
4247 struct lnet_msg *msg;
4248 __u32 payload_length;
4249 lnet_pid_t dest_pid;
4250 lnet_nid_t dest_nid;
4258 LASSERT (!in_interrupt ());
4260 type = le32_to_cpu(hdr->type);
4261 src_nid = le64_to_cpu(hdr->src_nid);
4262 dest_nid = le64_to_cpu(hdr->dest_nid);
4263 dest_pid = le32_to_cpu(hdr->dest_pid);
4264 payload_length = le32_to_cpu(hdr->payload_length);
4266 for_me = (ni->ni_nid == dest_nid);
4267 cpt = lnet_cpt_of_nid(from_nid, ni);
4269 CDEBUG(D_NET, "TRACE: %s(%s) <- %s : %s - %s\n",
4270 libcfs_nid2str(dest_nid),
4271 libcfs_nid2str(ni->ni_nid),
4272 libcfs_nid2str(src_nid),
4273 lnet_msgtyp2str(type),
4274 (for_me) ? "for me" : "routed");
4279 if (payload_length > 0) {
4280 CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
4281 libcfs_nid2str(from_nid),
4282 libcfs_nid2str(src_nid),
4283 lnet_msgtyp2str(type), payload_length);
4289 case LNET_MSG_REPLY:
4290 if (payload_length >
4291 (__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
4292 CERROR("%s, src %s: bad %s payload %d "
4293 "(%d max expected)\n",
4294 libcfs_nid2str(from_nid),
4295 libcfs_nid2str(src_nid),
4296 lnet_msgtyp2str(type),
4298 for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
4304 CERROR("%s, src %s: Bad message type 0x%x\n",
4305 libcfs_nid2str(from_nid),
4306 libcfs_nid2str(src_nid), type);
4310 if (the_lnet.ln_routing &&
4311 ni->ni_net->net_last_alive != ktime_get_real_seconds()) {
4313 spin_lock(&ni->ni_net->net_lock);
4314 ni->ni_net->net_last_alive = ktime_get_real_seconds();
4315 spin_unlock(&ni->ni_net->net_lock);
4316 if (ni->ni_status != NULL &&
4317 ni->ni_status->ns_status == LNET_NI_STATUS_DOWN) {
4318 ni->ni_status->ns_status = LNET_NI_STATUS_UP;
4325 lnet_push_update_to_peers(1);
4327 /* Regard a bad destination NID as a protocol error. Senders should
4328 * know what they're doing; if they don't they're misconfigured, buggy
4329 * or malicious so we chop them off at the knees :) */
4332 if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
4333 /* should have gone direct */
4334 CERROR("%s, src %s: Bad dest nid %s "
4335 "(should have been sent direct)\n",
4336 libcfs_nid2str(from_nid),
4337 libcfs_nid2str(src_nid),
4338 libcfs_nid2str(dest_nid));
4342 if (lnet_islocalnid(dest_nid)) {
4343 /* dest is another local NI; sender should have used
4344 * this node's NID on its own network */
4345 CERROR("%s, src %s: Bad dest nid %s "
4346 "(it's my nid but on a different network)\n",
4347 libcfs_nid2str(from_nid),
4348 libcfs_nid2str(src_nid),
4349 libcfs_nid2str(dest_nid));
4353 if (rdma_req && type == LNET_MSG_GET) {
4354 CERROR("%s, src %s: Bad optimized GET for %s "
4355 "(final destination must be me)\n",
4356 libcfs_nid2str(from_nid),
4357 libcfs_nid2str(src_nid),
4358 libcfs_nid2str(dest_nid));
4362 if (!the_lnet.ln_routing) {
4363 CERROR("%s, src %s: Dropping message for %s "
4364 "(routing not enabled)\n",
4365 libcfs_nid2str(from_nid),
4366 libcfs_nid2str(src_nid),
4367 libcfs_nid2str(dest_nid));
4372 /* Message looks OK; we're not going to return an error, so we MUST
4373 * call back lnd_recv() come what may... */
4375 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
4376 fail_peer(src_nid, 0)) { /* shall we now? */
4377 CERROR("%s, src %s: Dropping %s to simulate failure\n",
4378 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
4379 lnet_msgtyp2str(type));
4383 if (!list_empty(&the_lnet.ln_drop_rules) &&
4384 lnet_drop_rule_match(hdr, ni->ni_nid, NULL)) {
4385 CDEBUG(D_NET, "%s, src %s, dst %s: Dropping %s to simulate"
4386 "silent message loss\n",
4387 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
4388 libcfs_nid2str(dest_nid), lnet_msgtyp2str(type));
4392 if (lnet_drop_asym_route && for_me &&
4393 LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
4394 struct lnet_net *net;
4395 struct lnet_remotenet *rnet;
4398 /* we are dealing with a routed message,
4399 * so see if route to reach src_nid goes through from_nid
4402 net = lnet_get_net_locked(LNET_NIDNET(ni->ni_nid));
4404 lnet_net_unlock(cpt);
4405 CERROR("net %s not found\n",
4406 libcfs_net2str(LNET_NIDNET(ni->ni_nid)));
4410 rnet = lnet_find_rnet_locked(LNET_NIDNET(src_nid));
4412 struct lnet_peer *gw = NULL;
4413 struct lnet_peer_ni *lpni = NULL;
4414 struct lnet_route *route;
4416 list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
4418 gw = route->lr_gateway;
4419 if (route->lr_lnet != net->net_id)
4422 * if the nid is one of the gateway's NIDs
4423 * then this is a valid gateway
4425 while ((lpni = lnet_get_next_peer_ni_locked(gw,
4426 NULL, lpni)) != NULL) {
4427 if (lpni->lpni_nid == from_nid) {
4434 lnet_net_unlock(cpt);
4436 /* we would not use from_nid to route a message to
4438 * => asymmetric routing detected but forbidden
4440 CERROR("%s, src %s: Dropping asymmetrical route %s\n",
4441 libcfs_nid2str(from_nid),
4442 libcfs_nid2str(src_nid), lnet_msgtyp2str(type));
4447 msg = lnet_msg_alloc();
4449 CERROR("%s, src %s: Dropping %s (out of memory)\n",
4450 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
4451 lnet_msgtyp2str(type));
4455 /* msg zeroed in lnet_msg_alloc; i.e. flags all clear,
4456 * pointers NULL etc */
4458 msg->msg_type = type;
4459 msg->msg_private = private;
4460 msg->msg_receiving = 1;
4461 msg->msg_rdma_get = rdma_req;
4462 msg->msg_len = msg->msg_wanted = payload_length;
4463 msg->msg_offset = 0;
4464 msg->msg_hdr = *hdr;
4465 /* for building message event */
4466 msg->msg_from = from_nid;
4468 msg->msg_target.pid = dest_pid;
4469 msg->msg_target.nid = dest_nid;
4470 msg->msg_routing = 1;
4473 /* convert common msg->hdr fields to host byteorder */
4474 msg->msg_hdr.type = type;
4475 msg->msg_hdr.src_nid = src_nid;
4476 msg->msg_hdr.src_pid = le32_to_cpu(msg->msg_hdr.src_pid);
4477 msg->msg_hdr.dest_nid = dest_nid;
4478 msg->msg_hdr.dest_pid = dest_pid;
4479 msg->msg_hdr.payload_length = payload_length;
4483 lpni = lnet_nid2peerni_locked(from_nid, ni->ni_nid, cpt);
4485 lnet_net_unlock(cpt);
4486 CERROR("%s, src %s: Dropping %s "
4487 "(error %ld looking up sender)\n",
4488 libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
4489 lnet_msgtyp2str(type), PTR_ERR(lpni));
4491 if (rc == -ESHUTDOWN)
4492 /* We are shutting down. Don't do anything more */
4497 if (the_lnet.ln_routing)
4498 lpni->lpni_last_alive = ktime_get_seconds();
4500 msg->msg_rxpeer = lpni;
4502 lnet_ni_addref_locked(ni, cpt);
4503 /* Multi-Rail: Primary NID of source. */
4504 msg->msg_initiator = lnet_peer_primary_nid_locked(src_nid);
4507 * mark the status of this lpni as UP since we received a message
4508 * from it. The ping response reports back the ns_status which is
4509 * marked on the remote as up or down and we cache it here.
4511 msg->msg_rxpeer->lpni_ns_status = LNET_NI_STATUS_UP;
4513 lnet_msg_commit(msg, cpt);
4515 /* message delay simulation */
4516 if (unlikely(!list_empty(&the_lnet.ln_delay_rules) &&
4517 lnet_delay_rule_match_locked(hdr, msg))) {
4518 lnet_net_unlock(cpt);
4523 rc = lnet_parse_forward_locked(ni, msg);
4524 lnet_net_unlock(cpt);
4529 if (rc == LNET_CREDIT_OK) {
4530 lnet_ni_recv(ni, msg->msg_private, msg, 0,
4531 0, payload_length, payload_length);
4536 lnet_net_unlock(cpt);
4538 rc = lnet_parse_local(ni, msg);
4544 LASSERT(msg->msg_md == NULL);
4545 lnet_finalize(msg, rc);
4548 lnet_drop_message(ni, cpt, private, payload_length, type);
4551 EXPORT_SYMBOL(lnet_parse);
4554 lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
4556 while (!list_empty(head)) {
4557 struct lnet_process_id id = {0};
4558 struct lnet_msg *msg;
4560 msg = list_entry(head->next, struct lnet_msg, msg_list);
4561 list_del(&msg->msg_list);
4563 id.nid = msg->msg_hdr.src_nid;
4564 id.pid = msg->msg_hdr.src_pid;
4566 LASSERT(msg->msg_md == NULL);
4567 LASSERT(msg->msg_rx_delayed);
4568 LASSERT(msg->msg_rxpeer != NULL);
4569 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
4571 CWARN("Dropping delayed PUT from %s portal %d match %llu"
4572 " offset %d length %d: %s\n",
4574 msg->msg_hdr.msg.put.ptl_index,
4575 msg->msg_hdr.msg.put.match_bits,
4576 msg->msg_hdr.msg.put.offset,
4577 msg->msg_hdr.payload_length, reason);
4579 /* NB I can't drop msg's ref on msg_rxpeer until after I've
4580 * called lnet_drop_message(), so I just hang onto msg as well
4581 * until that's done */
4583 lnet_drop_message(msg->msg_rxni, msg->msg_rx_cpt,
4584 msg->msg_private, msg->msg_len,
4587 msg->msg_no_resend = true;
4589 * NB: message will not generate event because w/o attached MD,
4590 * but we still should give error code so lnet_msg_decommit()
4591 * can skip counters operations and other checks.
4593 lnet_finalize(msg, -ENOENT);
4598 lnet_recv_delayed_msg_list(struct list_head *head)
4600 while (!list_empty(head)) {
4601 struct lnet_msg *msg;
4602 struct lnet_process_id id;
4604 msg = list_entry(head->next, struct lnet_msg, msg_list);
4605 list_del(&msg->msg_list);
4607 /* md won't disappear under me, since each msg
4608 * holds a ref on it */
4610 id.nid = msg->msg_hdr.src_nid;
4611 id.pid = msg->msg_hdr.src_pid;
4613 LASSERT(msg->msg_rx_delayed);
4614 LASSERT(msg->msg_md != NULL);
4615 LASSERT(msg->msg_rxpeer != NULL);
4616 LASSERT(msg->msg_rxni != NULL);
4617 LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
4619 CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d "
4620 "match %llu offset %d length %d.\n",
4621 libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
4622 msg->msg_hdr.msg.put.match_bits,
4623 msg->msg_hdr.msg.put.offset,
4624 msg->msg_hdr.payload_length);
4626 lnet_recv_put(msg->msg_rxni, msg);
4631 lnet_attach_rsp_tracker(struct lnet_rsp_tracker *rspt, int cpt,
4632 struct lnet_libmd *md, struct lnet_handle_md mdh)
4635 bool new_entry = true;
4636 struct lnet_rsp_tracker *local_rspt;
4639 * MD has a refcount taken by message so it's not going away.
4640 * The MD however can be looked up. We need to secure the access
4641 * to the md_rspt_ptr by taking the res_lock.
4642 * The rspt can be accessed without protection up to when it gets
4643 * added to the list.
4647 local_rspt = md->md_rspt_ptr;
4648 timeout_ns = lnet_transaction_timeout * NSEC_PER_SEC;
4649 if (local_rspt != NULL) {
4651 * we already have an rspt attached to the md, so we'll
4652 * update the deadline on that one.
4654 LIBCFS_FREE(rspt, sizeof(*rspt));
4658 rspt->rspt_mdh = mdh;
4659 rspt->rspt_cpt = cpt;
4660 /* store the rspt so we can access it when we get the REPLY */
4661 md->md_rspt_ptr = rspt;
4664 local_rspt->rspt_deadline = ktime_add_ns(ktime_get(), timeout_ns);
4667 * add to the list of tracked responses. It's added to tail of the
4668 * list in order to expire all the older entries first.
4671 if (!new_entry && !list_empty(&local_rspt->rspt_on_list))
4672 list_del_init(&local_rspt->rspt_on_list);
4673 list_add_tail(&local_rspt->rspt_on_list, the_lnet.ln_mt_rstq[cpt]);
4674 lnet_net_unlock(cpt);
4675 lnet_res_unlock(cpt);
4679 * Initiate an asynchronous PUT operation.
4681 * There are several events associated with a PUT: completion of the send on
4682 * the initiator node (LNET_EVENT_SEND), and when the send completes
4683 * successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
4684 * that the operation was accepted by the target. The event LNET_EVENT_PUT is
4685 * used at the target node to indicate the completion of incoming data
4688 * The local events will be logged in the EQ associated with the MD pointed to
4689 * by \a mdh handle. Using a MD without an associated EQ results in these
4690 * events being discarded. In this case, the caller must have another
4691 * mechanism (e.g., a higher level protocol) for determining when it is safe
4692 * to modify the memory region associated with the MD.
4694 * Note that LNet does not guarantee the order of LNET_EVENT_SEND and
4695 * LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
4697 * \param self Indicates the NID of a local interface through which to send
4698 * the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
4699 * \param mdh A handle for the MD that describes the memory to be sent. The MD
4700 * must be "free floating" (See LNetMDBind()).
4701 * \param ack Controls whether an acknowledgment is requested.
4702 * Acknowledgments are only sent when they are requested by the initiating
4703 * process and the target MD enables them.
4704 * \param target A process identifier for the target process.
4705 * \param portal The index in the \a target's portal table.
4706 * \param match_bits The match bits to use for MD selection at the target
4708 * \param offset The offset into the target MD (only used when the target
4709 * MD has the LNET_MD_MANAGE_REMOTE option set).
4710 * \param hdr_data 64 bits of user data that can be included in the message
4711 * header. This data is written to an event queue entry at the target if an
4712 * EQ is present on the matching MD.
4714 * \retval 0 Success, and only in this case events will be generated
4715 * and logged to EQ (if it exists).
4716 * \retval -EIO Simulated failure.
4717 * \retval -ENOMEM Memory allocation failure.
4718 * \retval -ENOENT Invalid MD object.
4720 * \see struct lnet_event::hdr_data and lnet_event_kind_t.
4723 LNetPut(lnet_nid_t self, struct lnet_handle_md mdh, enum lnet_ack_req ack,
4724 struct lnet_process_id target, unsigned int portal,
4725 __u64 match_bits, unsigned int offset,
4728 struct lnet_msg *msg;
4729 struct lnet_libmd *md;
4732 struct lnet_rsp_tracker *rspt = NULL;
4734 LASSERT(the_lnet.ln_refcount > 0);
4736 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
4737 fail_peer(target.nid, 1)) { /* shall we now? */
4738 CERROR("Dropping PUT to %s: simulated failure\n",
4739 libcfs_id2str(target));
4743 msg = lnet_msg_alloc();
4745 CERROR("Dropping PUT to %s: ENOMEM on struct lnet_msg\n",
4746 libcfs_id2str(target));
4749 msg->msg_vmflush = !!memory_pressure_get();
4751 cpt = lnet_cpt_of_cookie(mdh.cookie);
4753 if (ack == LNET_ACK_REQ) {
4754 rspt = lnet_rspt_alloc(cpt);
4756 CERROR("Dropping PUT to %s: ENOMEM on response tracker\n",
4757 libcfs_id2str(target));
4760 INIT_LIST_HEAD(&rspt->rspt_on_list);
4765 md = lnet_handle2md(&mdh);
4766 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
4767 CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n",
4768 match_bits, portal, libcfs_id2str(target),
4769 md == NULL ? -1 : md->md_threshold);
4770 if (md != NULL && md->md_me != NULL)
4771 CERROR("Source MD also attached to portal %d\n",
4772 md->md_me->me_portal);
4773 lnet_res_unlock(cpt);
4775 LIBCFS_FREE(rspt, sizeof(*rspt));
4780 CDEBUG(D_NET, "LNetPut -> %s\n", libcfs_id2str(target));
4782 lnet_msg_attach_md(msg, md, 0, 0);
4784 lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
4786 msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
4787 msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
4788 msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
4789 msg->msg_hdr.msg.put.hdr_data = hdr_data;
4791 /* NB handles only looked up by creator (no flips) */
4792 if (ack == LNET_ACK_REQ) {
4793 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
4794 the_lnet.ln_interface_cookie;
4795 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
4796 md->md_lh.lh_cookie;
4798 msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
4799 LNET_WIRE_HANDLE_COOKIE_NONE;
4800 msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
4801 LNET_WIRE_HANDLE_COOKIE_NONE;
4804 lnet_res_unlock(cpt);
4806 lnet_build_msg_event(msg, LNET_EVENT_SEND);
4808 if (ack == LNET_ACK_REQ)
4809 lnet_attach_rsp_tracker(rspt, cpt, md, mdh);
4811 if (CFS_FAIL_CHECK_ORSET(CFS_FAIL_PTLRPC_OST_BULK_CB2,
4815 rc = lnet_send(self, msg, LNET_NID_ANY);
4818 CNETERR("Error sending PUT to %s: %d\n",
4819 libcfs_id2str(target), rc);
4820 msg->msg_no_resend = true;
4821 lnet_finalize(msg, rc);
4824 /* completion will be signalled by an event */
4827 EXPORT_SYMBOL(LNetPut);
4830 * The LND can DMA direct to the GET md (i.e. no REPLY msg). This
4831 * returns a msg for the LND to pass to lnet_finalize() when the sink
4832 * data has been received.
4834 * CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
4835 * lnet_finalize() is called on it, so the LND must call this first
4838 lnet_create_reply_msg(struct lnet_ni *ni, struct lnet_msg *getmsg)
4840 struct lnet_msg *msg = lnet_msg_alloc();
4841 struct lnet_libmd *getmd = getmsg->msg_md;
4842 struct lnet_process_id peer_id = getmsg->msg_target;
4845 LASSERT(!getmsg->msg_target_is_router);
4846 LASSERT(!getmsg->msg_routing);
4849 CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
4850 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
4854 cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
4857 LASSERT(getmd->md_refcount > 0);
4859 if (getmd->md_threshold == 0) {
4860 CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
4861 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
4863 lnet_res_unlock(cpt);
4867 LASSERT(getmd->md_offset == 0);
4869 CDEBUG(D_NET, "%s: Reply from %s md %p\n",
4870 libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
4872 /* setup information for lnet_build_msg_event */
4873 msg->msg_initiator = getmsg->msg_txpeer->lpni_peer_net->lpn_peer->lp_primary_nid;
4874 msg->msg_from = peer_id.nid;
4875 msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
4876 msg->msg_hdr.src_nid = peer_id.nid;
4877 msg->msg_hdr.payload_length = getmd->md_length;
4878 msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
4880 lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
4881 lnet_res_unlock(cpt);
4883 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
4886 lnet_msg_commit(msg, cpt);
4887 lnet_net_unlock(cpt);
4889 lnet_build_msg_event(msg, LNET_EVENT_REPLY);
4894 cpt = lnet_cpt_of_nid(peer_id.nid, ni);
4897 lnet_incr_stats(&ni->ni_stats, LNET_MSG_GET, LNET_STATS_TYPE_DROP);
4898 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_count++;
4899 the_lnet.ln_counters[cpt]->lct_common.lcc_drop_length +=
4901 lnet_net_unlock(cpt);
4908 EXPORT_SYMBOL(lnet_create_reply_msg);
4911 lnet_set_reply_msg_len(struct lnet_ni *ni, struct lnet_msg *reply,
4914 /* Set the REPLY length, now the RDMA that elides the REPLY message has
4915 * completed and I know it. */
4916 LASSERT(reply != NULL);
4917 LASSERT(reply->msg_type == LNET_MSG_GET);
4918 LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
4920 /* NB I trusted my peer to RDMA. If she tells me she's written beyond
4921 * the end of my buffer, I might as well be dead. */
4922 LASSERT(len <= reply->msg_ev.mlength);
4924 reply->msg_ev.mlength = len;
4926 EXPORT_SYMBOL(lnet_set_reply_msg_len);
4929 * Initiate an asynchronous GET operation.
4931 * On the initiator node, an LNET_EVENT_SEND is logged when the GET request
4932 * is sent, and an LNET_EVENT_REPLY is logged when the data returned from
4933 * the target node in the REPLY has been written to local MD.
4935 * On the target node, an LNET_EVENT_GET is logged when the GET request
4936 * arrives and is accepted into a MD.
4938 * \param self,target,portal,match_bits,offset See the discussion in LNetPut().
4939 * \param mdh A handle for the MD that describes the memory into which the
4940 * requested data will be received. The MD must be "free floating" (See LNetMDBind()).
4942 * \retval 0 Success, and only in this case events will be generated
4943 * and logged to EQ (if it exists) of the MD.
4944 * \retval -EIO Simulated failure.
4945 * \retval -ENOMEM Memory allocation failure.
4946 * \retval -ENOENT Invalid MD object.
4949 LNetGet(lnet_nid_t self, struct lnet_handle_md mdh,
4950 struct lnet_process_id target, unsigned int portal,
4951 __u64 match_bits, unsigned int offset, bool recovery)
4953 struct lnet_msg *msg;
4954 struct lnet_libmd *md;
4955 struct lnet_rsp_tracker *rspt;
4959 LASSERT(the_lnet.ln_refcount > 0);
4961 if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
4962 fail_peer(target.nid, 1)) /* shall we now? */
4964 CERROR("Dropping GET to %s: simulated failure\n",
4965 libcfs_id2str(target));
4969 msg = lnet_msg_alloc();
4971 CERROR("Dropping GET to %s: ENOMEM on struct lnet_msg\n",
4972 libcfs_id2str(target));
4976 cpt = lnet_cpt_of_cookie(mdh.cookie);
4978 rspt = lnet_rspt_alloc(cpt);
4980 CERROR("Dropping GET to %s: ENOMEM on response tracker\n",
4981 libcfs_id2str(target));
4984 INIT_LIST_HEAD(&rspt->rspt_on_list);
4986 msg->msg_recovery = recovery;
4990 md = lnet_handle2md(&mdh);
4991 if (md == NULL || md->md_threshold == 0 || md->md_me != NULL) {
4992 CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n",
4993 match_bits, portal, libcfs_id2str(target),
4994 md == NULL ? -1 : md->md_threshold);
4995 if (md != NULL && md->md_me != NULL)
4996 CERROR("REPLY MD also attached to portal %d\n",
4997 md->md_me->me_portal);
4999 lnet_res_unlock(cpt);
5002 LIBCFS_FREE(rspt, sizeof(*rspt));
5006 CDEBUG(D_NET, "LNetGet -> %s\n", libcfs_id2str(target));
5008 lnet_msg_attach_md(msg, md, 0, 0);
5010 lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
5012 msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
5013 msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
5014 msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
5015 msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
5017 /* NB handles only looked up by creator (no flips) */
5018 msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
5019 the_lnet.ln_interface_cookie;
5020 msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
5021 md->md_lh.lh_cookie;
5023 lnet_res_unlock(cpt);
5025 lnet_build_msg_event(msg, LNET_EVENT_SEND);
5027 lnet_attach_rsp_tracker(rspt, cpt, md, mdh);
5029 rc = lnet_send(self, msg, LNET_NID_ANY);
5031 CNETERR("Error sending GET to %s: %d\n",
5032 libcfs_id2str(target), rc);
5033 msg->msg_no_resend = true;
5034 lnet_finalize(msg, rc);
5037 /* completion will be signalled by an event */
5040 EXPORT_SYMBOL(LNetGet);
5043 * Calculate distance to node at \a dstnid.
5045 * \param dstnid Target NID.
5046 * \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
5048 * \param orderp If not NULL, order of the route to reach \a dstnid is saved
5051 * \retval 0 If \a dstnid belongs to a local interface, and reserved option
5052 * local_nid_dist_zero is set, which is the default.
5053 * \retval positives Distance to target NID, i.e. number of hops plus one.
5054 * \retval -EHOSTUNREACH If \a dstnid is not reachable.
5057 LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
5059 struct list_head *e;
5060 struct lnet_ni *ni = NULL;
5061 struct lnet_remotenet *rnet;
5062 __u32 dstnet = LNET_NIDNET(dstnid);
5066 struct list_head *rn_list;
5068 /* if !local_nid_dist_zero, I don't return a distance of 0 ever
5069 * (when lustre sees a distance of 0, it substitutes 0@lo), so I
5070 * keep order 0 free for 0@lo and order 1 free for a local NID
5073 LASSERT(the_lnet.ln_refcount > 0);
5075 cpt = lnet_net_lock_current();
5077 while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
5078 if (ni->ni_nid == dstnid) {
5079 if (srcnidp != NULL)
5081 if (orderp != NULL) {
5082 if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
5087 lnet_net_unlock(cpt);
5089 return local_nid_dist_zero ? 0 : 1;
5092 if (LNET_NIDNET(ni->ni_nid) == dstnet) {
5093 /* Check if ni was originally created in
5094 * current net namespace.
5095 * If not, assign order above 0xffff0000,
5096 * to make this ni not a priority. */
5097 if (!net_eq(ni->ni_net_ns, current->nsproxy->net_ns))
5098 order += 0xffff0000;
5100 if (srcnidp != NULL)
5101 *srcnidp = ni->ni_nid;
5104 lnet_net_unlock(cpt);
5111 rn_list = lnet_net2rnethash(dstnet);
5112 list_for_each(e, rn_list) {
5113 rnet = list_entry(e, struct lnet_remotenet, lrn_list);
5115 if (rnet->lrn_net == dstnet) {
5116 struct lnet_route *route;
5117 struct lnet_route *shortest = NULL;
5118 __u32 shortest_hops = LNET_UNDEFINED_HOPS;
5121 LASSERT(!list_empty(&rnet->lrn_routes));
5123 list_for_each_entry(route, &rnet->lrn_routes,
5125 route_hops = route->lr_hops;
5126 if (route_hops == LNET_UNDEFINED_HOPS)
5128 if (shortest == NULL ||
5129 route_hops < shortest_hops) {
5131 shortest_hops = route_hops;
5135 LASSERT(shortest != NULL);
5136 hops = shortest_hops;
5137 if (srcnidp != NULL) {
5138 struct lnet_net *net;
5139 net = lnet_get_net_locked(shortest->lr_lnet);
5141 ni = lnet_get_next_ni_locked(net, NULL);
5142 *srcnidp = ni->ni_nid;
5146 lnet_net_unlock(cpt);
5152 lnet_net_unlock(cpt);
5153 return -EHOSTUNREACH;
5155 EXPORT_SYMBOL(LNetDist);