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gem5 / arm / linux / a524c1eea084def85e1122b64beda9bb3aca0e49 / . / drivers / staging / lustre / lnet / lnet / lib-move.c
blob: bc0779c02d9721ae8966790c5508e51f4f9eb4a2 [file] [log] [blame]
/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2011, 2015, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* lnet/lnet/lib-move.c
*
* Data movement routines
*/
#define DEBUG_SUBSYSTEM S_LNET
#include <linux/lnet/lib-lnet.h>
#include <linux/nsproxy.h>
#include <net/net_namespace.h>
static int local_nid_dist_zero = 1;
module_param(local_nid_dist_zero, int, 0444);
MODULE_PARM_DESC(local_nid_dist_zero, "Reserved");
int
lnet_fail_nid(lnet_nid_t nid, unsigned int threshold)
{
struct lnet_test_peer *tp;
struct lnet_test_peer *temp;
struct list_head *el;
struct list_head *next;
struct list_head cull;
/* NB: use lnet_net_lock(0) to serialize operations on test peers */
if (threshold) {
/* Adding a new entry */
LIBCFS_ALLOC(tp, sizeof(*tp));
if (!tp)
return -ENOMEM;
tp->tp_nid = nid;
tp->tp_threshold = threshold;
lnet_net_lock(0);
list_add_tail(&tp->tp_list, &the_lnet.ln_test_peers);
lnet_net_unlock(0);
return 0;
}
/* removing entries */
INIT_LIST_HEAD(&cull);
lnet_net_lock(0);
list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
tp = list_entry(el, struct lnet_test_peer, tp_list);
if (!tp->tp_threshold || /* needs culling anyway */
nid == LNET_NID_ANY || /* removing all entries */
tp->tp_nid == nid) { /* matched this one */
list_del(&tp->tp_list);
list_add(&tp->tp_list, &cull);
}
}
lnet_net_unlock(0);
list_for_each_entry_safe(tp, temp, &cull, tp_list) {
list_del(&tp->tp_list);
LIBCFS_FREE(tp, sizeof(*tp));
}
return 0;
}
static int
fail_peer(lnet_nid_t nid, int outgoing)
{
struct lnet_test_peer *tp;
struct lnet_test_peer *temp;
struct list_head *el;
struct list_head *next;
struct list_head cull;
int fail = 0;
INIT_LIST_HEAD(&cull);
/* NB: use lnet_net_lock(0) to serialize operations on test peers */
lnet_net_lock(0);
list_for_each_safe(el, next, &the_lnet.ln_test_peers) {
tp = list_entry(el, struct lnet_test_peer, tp_list);
if (!tp->tp_threshold) {
/* zombie entry */
if (outgoing) {
/*
* only cull zombies on outgoing tests,
* since we may be at interrupt priority on
* incoming messages.
*/
list_del(&tp->tp_list);
list_add(&tp->tp_list, &cull);
}
continue;
}
if (tp->tp_nid == LNET_NID_ANY || /* fail every peer */
nid == tp->tp_nid) { /* fail this peer */
fail = 1;
if (tp->tp_threshold != LNET_MD_THRESH_INF) {
tp->tp_threshold--;
if (outgoing &&
!tp->tp_threshold) {
/* see above */
list_del(&tp->tp_list);
list_add(&tp->tp_list, &cull);
}
}
break;
}
}
lnet_net_unlock(0);
list_for_each_entry_safe(tp, temp, &cull, tp_list) {
list_del(&tp->tp_list);
LIBCFS_FREE(tp, sizeof(*tp));
}
return fail;
}
unsigned int
lnet_iov_nob(unsigned int niov, struct kvec *iov)
{
unsigned int nob = 0;
LASSERT(!niov || iov);
while (niov-- > 0)
nob += (iov++)->iov_len;
return nob;
}
EXPORT_SYMBOL(lnet_iov_nob);
void
lnet_copy_iov2iter(struct iov_iter *to,
unsigned int nsiov, const struct kvec *siov,
unsigned int soffset, unsigned int nob)
{
/* NB diov, siov are READ-ONLY */
const char *s;
size_t left;
if (!nob)
return;
/* skip complete frags before 'soffset' */
LASSERT(nsiov > 0);
while (soffset >= siov->iov_len) {
soffset -= siov->iov_len;
siov++;
nsiov--;
LASSERT(nsiov > 0);
}
s = (char *)siov->iov_base + soffset;
left = siov->iov_len - soffset;
do {
size_t n, copy = left;
LASSERT(nsiov > 0);
if (copy > nob)
copy = nob;
n = copy_to_iter(s, copy, to);
if (n != copy)
return;
nob -= n;
siov++;
s = (char *)siov->iov_base;
left = siov->iov_len;
nsiov--;
} while (nob > 0);
}
EXPORT_SYMBOL(lnet_copy_iov2iter);
void
lnet_copy_kiov2iter(struct iov_iter *to,
unsigned int nsiov, const struct bio_vec *siov,
unsigned int soffset, unsigned int nob)
{
if (!nob)
return;
LASSERT(!in_interrupt());
LASSERT(nsiov > 0);
while (soffset >= siov->bv_len) {
soffset -= siov->bv_len;
siov++;
nsiov--;
LASSERT(nsiov > 0);
}
do {
size_t copy = siov->bv_len - soffset, n;
LASSERT(nsiov > 0);
if (copy > nob)
copy = nob;
n = copy_page_to_iter(siov->bv_page,
siov->bv_offset + soffset,
copy, to);
if (n != copy)
return;
nob -= n;
siov++;
nsiov--;
soffset = 0;
} while (nob > 0);
}
EXPORT_SYMBOL(lnet_copy_kiov2iter);
int
lnet_extract_iov(int dst_niov, struct kvec *dst,
int src_niov, const struct kvec *src,
unsigned int offset, unsigned int len)
{
/*
* Initialise 'dst' to the subset of 'src' starting at 'offset',
* for exactly 'len' bytes, and return the number of entries.
* NB not destructive to 'src'
*/
unsigned int frag_len;
unsigned int niov;
if (!len) /* no data => */
return 0; /* no frags */
LASSERT(src_niov > 0);
while (offset >= src->iov_len) { /* skip initial frags */
offset -= src->iov_len;
src_niov--;
src++;
LASSERT(src_niov > 0);
}
niov = 1;
for (;;) {
LASSERT(src_niov > 0);
LASSERT((int)niov <= dst_niov);
frag_len = src->iov_len - offset;
dst->iov_base = ((char *)src->iov_base) + offset;
if (len <= frag_len) {
dst->iov_len = len;
return niov;
}
dst->iov_len = frag_len;
len -= frag_len;
dst++;
src++;
niov++;
src_niov--;
offset = 0;
}
}
EXPORT_SYMBOL(lnet_extract_iov);
unsigned int
lnet_kiov_nob(unsigned int niov, struct bio_vec *kiov)
{
unsigned int nob = 0;
LASSERT(!niov || kiov);
while (niov-- > 0)
nob += (kiov++)->bv_len;
return nob;
}
EXPORT_SYMBOL(lnet_kiov_nob);
int
lnet_extract_kiov(int dst_niov, struct bio_vec *dst,
int src_niov, const struct bio_vec *src,
unsigned int offset, unsigned int len)
{
/*
* Initialise 'dst' to the subset of 'src' starting at 'offset',
* for exactly 'len' bytes, and return the number of entries.
* NB not destructive to 'src'
*/
unsigned int frag_len;
unsigned int niov;
if (!len) /* no data => */
return 0; /* no frags */
LASSERT(src_niov > 0);
while (offset >= src->bv_len) { /* skip initial frags */
offset -= src->bv_len;
src_niov--;
src++;
LASSERT(src_niov > 0);
}
niov = 1;
for (;;) {
LASSERT(src_niov > 0);
LASSERT((int)niov <= dst_niov);
frag_len = src->bv_len - offset;
dst->bv_page = src->bv_page;
dst->bv_offset = src->bv_offset + offset;
if (len <= frag_len) {
dst->bv_len = len;
LASSERT(dst->bv_offset + dst->bv_len
<= PAGE_SIZE);
return niov;
}
dst->bv_len = frag_len;
LASSERT(dst->bv_offset + dst->bv_len <= PAGE_SIZE);
len -= frag_len;
dst++;
src++;
niov++;
src_niov--;
offset = 0;
}
}
EXPORT_SYMBOL(lnet_extract_kiov);
void
lnet_ni_recv(struct lnet_ni *ni, void *private, struct lnet_msg *msg,
int delayed, unsigned int offset, unsigned int mlen,
unsigned int rlen)
{
unsigned int niov = 0;
struct kvec *iov = NULL;
struct bio_vec *kiov = NULL;
struct iov_iter to;
int rc;
LASSERT(!in_interrupt());
LASSERT(!mlen || msg);
if (msg) {
LASSERT(msg->msg_receiving);
LASSERT(!msg->msg_sending);
LASSERT(rlen == msg->msg_len);
LASSERT(mlen <= msg->msg_len);
LASSERT(msg->msg_offset == offset);
LASSERT(msg->msg_wanted == mlen);
msg->msg_receiving = 0;
if (mlen) {
niov = msg->msg_niov;
iov = msg->msg_iov;
kiov = msg->msg_kiov;
LASSERT(niov > 0);
LASSERT(!iov != !kiov);
}
}
if (iov) {
iov_iter_kvec(&to, ITER_KVEC | READ, iov, niov, mlen + offset);
iov_iter_advance(&to, offset);
} else {
iov_iter_bvec(&to, ITER_BVEC | READ, kiov, niov, mlen + offset);
iov_iter_advance(&to, offset);
}
rc = ni->ni_lnd->lnd_recv(ni, private, msg, delayed, &to, rlen);
if (rc < 0)
lnet_finalize(ni, msg, rc);
}
static void
lnet_setpayloadbuffer(struct lnet_msg *msg)
{
struct lnet_libmd *md = msg->msg_md;
LASSERT(msg->msg_len > 0);
LASSERT(!msg->msg_routing);
LASSERT(md);
LASSERT(!msg->msg_niov);
LASSERT(!msg->msg_iov);
LASSERT(!msg->msg_kiov);
msg->msg_niov = md->md_niov;
if (md->md_options & LNET_MD_KIOV)
msg->msg_kiov = md->md_iov.kiov;
else
msg->msg_iov = md->md_iov.iov;
}
void
lnet_prep_send(struct lnet_msg *msg, int type, struct lnet_process_id target,
unsigned int offset, unsigned int len)
{
msg->msg_type = type;
msg->msg_target = target;
msg->msg_len = len;
msg->msg_offset = offset;
if (len)
lnet_setpayloadbuffer(msg);
memset(&msg->msg_hdr, 0, sizeof(msg->msg_hdr));
msg->msg_hdr.type = cpu_to_le32(type);
msg->msg_hdr.dest_nid = cpu_to_le64(target.nid);
msg->msg_hdr.dest_pid = cpu_to_le32(target.pid);
/* src_nid will be set later */
msg->msg_hdr.src_pid = cpu_to_le32(the_lnet.ln_pid);
msg->msg_hdr.payload_length = cpu_to_le32(len);
}
static void
lnet_ni_send(struct lnet_ni *ni, struct lnet_msg *msg)
{
void *priv = msg->msg_private;
int rc;
LASSERT(!in_interrupt());
LASSERT(LNET_NETTYP(LNET_NIDNET(ni->ni_nid)) == LOLND ||
(msg->msg_txcredit && msg->msg_peertxcredit));
rc = ni->ni_lnd->lnd_send(ni, priv, msg);
if (rc < 0)
lnet_finalize(ni, msg, rc);
}
static int
lnet_ni_eager_recv(struct lnet_ni *ni, struct lnet_msg *msg)
{
int rc;
LASSERT(!msg->msg_sending);
LASSERT(msg->msg_receiving);
LASSERT(!msg->msg_rx_ready_delay);
LASSERT(ni->ni_lnd->lnd_eager_recv);
msg->msg_rx_ready_delay = 1;
rc = ni->ni_lnd->lnd_eager_recv(ni, msg->msg_private, msg,
&msg->msg_private);
if (rc) {
CERROR("recv from %s / send to %s aborted: eager_recv failed %d\n",
libcfs_nid2str(msg->msg_rxpeer->lp_nid),
libcfs_id2str(msg->msg_target), rc);
LASSERT(rc < 0); /* required by my callers */
}
return rc;
}
/* NB: caller shall hold a ref on 'lp' as I'd drop lnet_net_lock */
static void
lnet_ni_query_locked(struct lnet_ni *ni, struct lnet_peer *lp)
{
unsigned long last_alive = 0;
LASSERT(lnet_peer_aliveness_enabled(lp));
LASSERT(ni->ni_lnd->lnd_query);
lnet_net_unlock(lp->lp_cpt);
ni->ni_lnd->lnd_query(ni, lp->lp_nid, &last_alive);
lnet_net_lock(lp->lp_cpt);
lp->lp_last_query = cfs_time_current();
if (last_alive) /* NI has updated timestamp */
lp->lp_last_alive = last_alive;
}
/* NB: always called with lnet_net_lock held */
static inline int
lnet_peer_is_alive(struct lnet_peer *lp, unsigned long now)
{
int alive;
unsigned long deadline;
LASSERT(lnet_peer_aliveness_enabled(lp));
/* Trust lnet_notify() if it has more recent aliveness news, but
* ignore the initial assumed death (see lnet_peers_start_down()).
*/
if (!lp->lp_alive && lp->lp_alive_count > 0 &&
cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive))
return 0;
deadline = cfs_time_add(lp->lp_last_alive,
cfs_time_seconds(lp->lp_ni->ni_peertimeout));
alive = cfs_time_after(deadline, now);
/* Update obsolete lp_alive except for routers assumed to be dead
* initially, because router checker would update aliveness in this
* case, and moreover lp_last_alive at peer creation is assumed.
*/
if (alive && !lp->lp_alive &&
!(lnet_isrouter(lp) && !lp->lp_alive_count))
lnet_notify_locked(lp, 0, 1, lp->lp_last_alive);
return alive;
}
/*
* NB: returns 1 when alive, 0 when dead, negative when error;
* may drop the lnet_net_lock
*/
static int
lnet_peer_alive_locked(struct lnet_peer *lp)
{
unsigned long now = cfs_time_current();
if (!lnet_peer_aliveness_enabled(lp))
return -ENODEV;
if (lnet_peer_is_alive(lp, now))
return 1;
/*
* Peer appears dead, but we should avoid frequent NI queries (at
* most once per lnet_queryinterval seconds).
*/
if (lp->lp_last_query) {
static const int lnet_queryinterval = 1;
unsigned long next_query =
cfs_time_add(lp->lp_last_query,
cfs_time_seconds(lnet_queryinterval));
if (time_before(now, next_query)) {
if (lp->lp_alive)
CWARN("Unexpected aliveness of peer %s: %d < %d (%d/%d)\n",
libcfs_nid2str(lp->lp_nid),
(int)now, (int)next_query,
lnet_queryinterval,
lp->lp_ni->ni_peertimeout);
return 0;
}
}
/* query NI for latest aliveness news */
lnet_ni_query_locked(lp->lp_ni, lp);
if (lnet_peer_is_alive(lp, now))
return 1;
lnet_notify_locked(lp, 0, 0, lp->lp_last_alive);
return 0;
}
/**
* \param msg The message to be sent.
* \param do_send True if lnet_ni_send() should be called in this function.
* lnet_send() is going to lnet_net_unlock immediately after this, so
* it sets do_send FALSE and I don't do the unlock/send/lock bit.
*
* \retval LNET_CREDIT_OK If \a msg sent or OK to send.
* \retval LNET_CREDIT_WAIT If \a msg blocked for credit.
* \retval -EHOSTUNREACH If the next hop of the message appears dead.
* \retval -ECANCELED If the MD of the message has been unlinked.
*/
static int
lnet_post_send_locked(struct lnet_msg *msg, int do_send)
{
struct lnet_peer *lp = msg->msg_txpeer;
struct lnet_ni *ni = lp->lp_ni;
int cpt = msg->msg_tx_cpt;
struct lnet_tx_queue *tq = ni->ni_tx_queues[cpt];
/* non-lnet_send() callers have checked before */
LASSERT(!do_send || msg->msg_tx_delayed);
LASSERT(!msg->msg_receiving);
LASSERT(msg->msg_tx_committed);
/* NB 'lp' is always the next hop */
if (!(msg->msg_target.pid & LNET_PID_USERFLAG) &&
!lnet_peer_alive_locked(lp)) {
the_lnet.ln_counters[cpt]->drop_count++;
the_lnet.ln_counters[cpt]->drop_length += msg->msg_len;
lnet_net_unlock(cpt);
CNETERR("Dropping message for %s: peer not alive\n",
libcfs_id2str(msg->msg_target));
if (do_send)
lnet_finalize(ni, msg, -EHOSTUNREACH);
lnet_net_lock(cpt);
return -EHOSTUNREACH;
}
if (msg->msg_md &&
(msg->msg_md->md_flags & LNET_MD_FLAG_ABORTED)) {
lnet_net_unlock(cpt);
CNETERR("Aborting message for %s: LNetM[DE]Unlink() already called on the MD/ME.\n",
libcfs_id2str(msg->msg_target));
if (do_send)
lnet_finalize(ni, msg, -ECANCELED);
lnet_net_lock(cpt);
return -ECANCELED;
}
if (!msg->msg_peertxcredit) {
LASSERT((lp->lp_txcredits < 0) ==
!list_empty(&lp->lp_txq));
msg->msg_peertxcredit = 1;
lp->lp_txqnob += msg->msg_len + sizeof(struct lnet_hdr);
lp->lp_txcredits--;
if (lp->lp_txcredits < lp->lp_mintxcredits)
lp->lp_mintxcredits = lp->lp_txcredits;
if (lp->lp_txcredits < 0) {
msg->msg_tx_delayed = 1;
list_add_tail(&msg->msg_list, &lp->lp_txq);
return LNET_CREDIT_WAIT;
}
}
if (!msg->msg_txcredit) {
LASSERT((tq->tq_credits < 0) ==
!list_empty(&tq->tq_delayed));
msg->msg_txcredit = 1;
tq->tq_credits--;
if (tq->tq_credits < tq->tq_credits_min)
tq->tq_credits_min = tq->tq_credits;
if (tq->tq_credits < 0) {
msg->msg_tx_delayed = 1;
list_add_tail(&msg->msg_list, &tq->tq_delayed);
return LNET_CREDIT_WAIT;
}
}
if (do_send) {
lnet_net_unlock(cpt);
lnet_ni_send(ni, msg);
lnet_net_lock(cpt);
}
return LNET_CREDIT_OK;
}
static struct lnet_rtrbufpool *
lnet_msg2bufpool(struct lnet_msg *msg)
{
struct lnet_rtrbufpool *rbp;
int cpt;
LASSERT(msg->msg_rx_committed);
cpt = msg->msg_rx_cpt;
rbp = &the_lnet.ln_rtrpools[cpt][0];
LASSERT(msg->msg_len <= LNET_MTU);
while (msg->msg_len > (unsigned int)rbp->rbp_npages * PAGE_SIZE) {
rbp++;
LASSERT(rbp < &the_lnet.ln_rtrpools[cpt][LNET_NRBPOOLS]);
}
return rbp;
}
static int
lnet_post_routed_recv_locked(struct lnet_msg *msg, int do_recv)
{
/*
* lnet_parse is going to lnet_net_unlock immediately after this, so it
* sets do_recv FALSE and I don't do the unlock/send/lock bit.
* I return LNET_CREDIT_WAIT if msg blocked and LNET_CREDIT_OK if
* received or OK to receive
*/
struct lnet_peer *lp = msg->msg_rxpeer;
struct lnet_rtrbufpool *rbp;
struct lnet_rtrbuf *rb;
LASSERT(!msg->msg_iov);
LASSERT(!msg->msg_kiov);
LASSERT(!msg->msg_niov);
LASSERT(msg->msg_routing);
LASSERT(msg->msg_receiving);
LASSERT(!msg->msg_sending);
/* non-lnet_parse callers only receive delayed messages */
LASSERT(!do_recv || msg->msg_rx_delayed);
if (!msg->msg_peerrtrcredit) {
LASSERT((lp->lp_rtrcredits < 0) ==
!list_empty(&lp->lp_rtrq));
msg->msg_peerrtrcredit = 1;
lp->lp_rtrcredits--;
if (lp->lp_rtrcredits < lp->lp_minrtrcredits)
lp->lp_minrtrcredits = lp->lp_rtrcredits;
if (lp->lp_rtrcredits < 0) {
/* must have checked eager_recv before here */
LASSERT(msg->msg_rx_ready_delay);
msg->msg_rx_delayed = 1;
list_add_tail(&msg->msg_list, &lp->lp_rtrq);
return LNET_CREDIT_WAIT;
}
}
rbp = lnet_msg2bufpool(msg);
if (!msg->msg_rtrcredit) {
msg->msg_rtrcredit = 1;
rbp->rbp_credits--;
if (rbp->rbp_credits < rbp->rbp_mincredits)
rbp->rbp_mincredits = rbp->rbp_credits;
if (rbp->rbp_credits < 0) {
/* must have checked eager_recv before here */
LASSERT(msg->msg_rx_ready_delay);
msg->msg_rx_delayed = 1;
list_add_tail(&msg->msg_list, &rbp->rbp_msgs);
return LNET_CREDIT_WAIT;
}
}
LASSERT(!list_empty(&rbp->rbp_bufs));
rb = list_entry(rbp->rbp_bufs.next, struct lnet_rtrbuf, rb_list);
list_del(&rb->rb_list);
msg->msg_niov = rbp->rbp_npages;
msg->msg_kiov = &rb->rb_kiov[0];
if (do_recv) {
int cpt = msg->msg_rx_cpt;
lnet_net_unlock(cpt);
lnet_ni_recv(lp->lp_ni, msg->msg_private, msg, 1,
0, msg->msg_len, msg->msg_len);
lnet_net_lock(cpt);
}
return LNET_CREDIT_OK;
}
void
lnet_return_tx_credits_locked(struct lnet_msg *msg)
{
struct lnet_peer *txpeer = msg->msg_txpeer;
struct lnet_msg *msg2;
if (msg->msg_txcredit) {
struct lnet_ni *ni = txpeer->lp_ni;
struct lnet_tx_queue *tq = ni->ni_tx_queues[msg->msg_tx_cpt];
/* give back NI txcredits */
msg->msg_txcredit = 0;
LASSERT((tq->tq_credits < 0) ==
!list_empty(&tq->tq_delayed));
tq->tq_credits++;
if (tq->tq_credits <= 0) {
msg2 = list_entry(tq->tq_delayed.next,
struct lnet_msg, msg_list);
list_del(&msg2->msg_list);
LASSERT(msg2->msg_txpeer->lp_ni == ni);
LASSERT(msg2->msg_tx_delayed);
(void)lnet_post_send_locked(msg2, 1);
}
}
if (msg->msg_peertxcredit) {
/* give back peer txcredits */
msg->msg_peertxcredit = 0;
LASSERT((txpeer->lp_txcredits < 0) ==
!list_empty(&txpeer->lp_txq));
txpeer->lp_txqnob -= msg->msg_len + sizeof(struct lnet_hdr);
LASSERT(txpeer->lp_txqnob >= 0);
txpeer->lp_txcredits++;
if (txpeer->lp_txcredits <= 0) {
msg2 = list_entry(txpeer->lp_txq.next,
struct lnet_msg, msg_list);
list_del(&msg2->msg_list);
LASSERT(msg2->msg_txpeer == txpeer);
LASSERT(msg2->msg_tx_delayed);
(void)lnet_post_send_locked(msg2, 1);
}
}
if (txpeer) {
msg->msg_txpeer = NULL;
lnet_peer_decref_locked(txpeer);
}
}
void
lnet_schedule_blocked_locked(struct lnet_rtrbufpool *rbp)
{
struct lnet_msg *msg;
if (list_empty(&rbp->rbp_msgs))
return;
msg = list_entry(rbp->rbp_msgs.next,
struct lnet_msg, msg_list);
list_del(&msg->msg_list);
(void)lnet_post_routed_recv_locked(msg, 1);
}
void
lnet_drop_routed_msgs_locked(struct list_head *list, int cpt)
{
struct list_head drop;
struct lnet_msg *msg;
struct lnet_msg *tmp;
INIT_LIST_HEAD(&drop);
list_splice_init(list, &drop);
lnet_net_unlock(cpt);
list_for_each_entry_safe(msg, tmp, &drop, msg_list) {
lnet_ni_recv(msg->msg_rxpeer->lp_ni, msg->msg_private, NULL,
0, 0, 0, msg->msg_hdr.payload_length);
list_del_init(&msg->msg_list);
lnet_finalize(NULL, msg, -ECANCELED);
}
lnet_net_lock(cpt);
}
void
lnet_return_rx_credits_locked(struct lnet_msg *msg)
{
struct lnet_peer *rxpeer = msg->msg_rxpeer;
struct lnet_msg *msg2;
if (msg->msg_rtrcredit) {
/* give back global router credits */
struct lnet_rtrbuf *rb;
struct lnet_rtrbufpool *rbp;
/*
* NB If a msg ever blocks for a buffer in rbp_msgs, it stays
* there until it gets one allocated, or aborts the wait
* itself
*/
LASSERT(msg->msg_kiov);
rb = list_entry(msg->msg_kiov, struct lnet_rtrbuf, rb_kiov[0]);
rbp = rb->rb_pool;
msg->msg_kiov = NULL;
msg->msg_rtrcredit = 0;
LASSERT(rbp == lnet_msg2bufpool(msg));
LASSERT((rbp->rbp_credits > 0) ==
!list_empty(&rbp->rbp_bufs));
/*
* If routing is now turned off, we just drop this buffer and
* don't bother trying to return credits.
*/
if (!the_lnet.ln_routing) {
lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
goto routing_off;
}
/*
* It is possible that a user has lowered the desired number of
* buffers in this pool. Make sure we never put back
* more buffers than the stated number.
*/
if (unlikely(rbp->rbp_credits >= rbp->rbp_req_nbuffers)) {
/* Discard this buffer so we don't have too many. */
lnet_destroy_rtrbuf(rb, rbp->rbp_npages);
rbp->rbp_nbuffers--;
} else {
list_add(&rb->rb_list, &rbp->rbp_bufs);
rbp->rbp_credits++;
if (rbp->rbp_credits <= 0)
lnet_schedule_blocked_locked(rbp);
}
}
routing_off:
if (msg->msg_peerrtrcredit) {
/* give back peer router credits */
msg->msg_peerrtrcredit = 0;
LASSERT((rxpeer->lp_rtrcredits < 0) ==
!list_empty(&rxpeer->lp_rtrq));
rxpeer->lp_rtrcredits++;
/*
* drop all messages which are queued to be routed on that
* peer.
*/
if (!the_lnet.ln_routing) {
lnet_drop_routed_msgs_locked(&rxpeer->lp_rtrq,
msg->msg_rx_cpt);
} else if (rxpeer->lp_rtrcredits <= 0) {
msg2 = list_entry(rxpeer->lp_rtrq.next,
struct lnet_msg, msg_list);
list_del(&msg2->msg_list);
(void)lnet_post_routed_recv_locked(msg2, 1);
}
}
if (rxpeer) {
msg->msg_rxpeer = NULL;
lnet_peer_decref_locked(rxpeer);
}
}
static int
lnet_compare_routes(struct lnet_route *r1, struct lnet_route *r2)
{
struct lnet_peer *p1 = r1->lr_gateway;
struct lnet_peer *p2 = r2->lr_gateway;
int r1_hops = (r1->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r1->lr_hops;
int r2_hops = (r2->lr_hops == LNET_UNDEFINED_HOPS) ? 1 : r2->lr_hops;
if (r1->lr_priority < r2->lr_priority)
return 1;
if (r1->lr_priority > r2->lr_priority)
return -ERANGE;
if (r1_hops < r2_hops)
return 1;
if (r1_hops > r2_hops)
return -ERANGE;
if (p1->lp_txqnob < p2->lp_txqnob)
return 1;
if (p1->lp_txqnob > p2->lp_txqnob)
return -ERANGE;
if (p1->lp_txcredits > p2->lp_txcredits)
return 1;
if (p1->lp_txcredits < p2->lp_txcredits)
return -ERANGE;
if (r1->lr_seq - r2->lr_seq <= 0)
return 1;
return -ERANGE;
}
static struct lnet_peer *
lnet_find_route_locked(struct lnet_ni *ni, lnet_nid_t target,
lnet_nid_t rtr_nid)
{
struct lnet_remotenet *rnet;
struct lnet_route *route;
struct lnet_route *best_route;
struct lnet_route *last_route;
struct lnet_peer *lp_best;
struct lnet_peer *lp;
int rc;
/*
* If @rtr_nid is not LNET_NID_ANY, return the gateway with
* rtr_nid nid, otherwise find the best gateway I can use
*/
rnet = lnet_find_net_locked(LNET_NIDNET(target));
if (!rnet)
return NULL;
lp_best = NULL;
best_route = NULL;
last_route = NULL;
list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
lp = route->lr_gateway;
if (!lnet_is_route_alive(route))
continue;
if (ni && lp->lp_ni != ni)
continue;
if (lp->lp_nid == rtr_nid) /* it's pre-determined router */
return lp;
if (!lp_best) {
best_route = route;
last_route = route;
lp_best = lp;
continue;
}
/* no protection on below fields, but it's harmless */
if (last_route->lr_seq - route->lr_seq < 0)
last_route = route;
rc = lnet_compare_routes(route, best_route);
if (rc < 0)
continue;
best_route = route;
lp_best = lp;
}
/*
* set sequence number on the best router to the latest sequence + 1
* so we can round-robin all routers, it's race and inaccurate but
* harmless and functional
*/
if (best_route)
best_route->lr_seq = last_route->lr_seq + 1;
return lp_best;
}
int
lnet_send(lnet_nid_t src_nid, struct lnet_msg *msg, lnet_nid_t rtr_nid)
{
lnet_nid_t dst_nid = msg->msg_target.nid;
struct lnet_ni *src_ni;
struct lnet_ni *local_ni;
struct lnet_peer *lp;
int cpt;
int cpt2;
int rc;
/*
* NB: rtr_nid is set to LNET_NID_ANY for all current use-cases,
* but we might want to use pre-determined router for ACK/REPLY
* in the future
*/
/* NB: ni == interface pre-determined (ACK/REPLY) */
LASSERT(!msg->msg_txpeer);
LASSERT(!msg->msg_sending);
LASSERT(!msg->msg_target_is_router);
LASSERT(!msg->msg_receiving);
msg->msg_sending = 1;
LASSERT(!msg->msg_tx_committed);
cpt = lnet_cpt_of_nid(rtr_nid == LNET_NID_ANY ? dst_nid : rtr_nid);
again:
lnet_net_lock(cpt);
if (the_lnet.ln_shutdown) {
lnet_net_unlock(cpt);
return -ESHUTDOWN;
}
if (src_nid == LNET_NID_ANY) {
src_ni = NULL;
} else {
src_ni = lnet_nid2ni_locked(src_nid, cpt);
if (!src_ni) {
lnet_net_unlock(cpt);
LCONSOLE_WARN("Can't send to %s: src %s is not a local nid\n",
libcfs_nid2str(dst_nid),
libcfs_nid2str(src_nid));
return -EINVAL;
}
LASSERT(!msg->msg_routing);
}
/* Is this for someone on a local network? */
local_ni = lnet_net2ni_locked(LNET_NIDNET(dst_nid), cpt);
if (local_ni) {
if (!src_ni) {
src_ni = local_ni;
src_nid = src_ni->ni_nid;
} else if (src_ni == local_ni) {
lnet_ni_decref_locked(local_ni, cpt);
} else {
lnet_ni_decref_locked(local_ni, cpt);
lnet_ni_decref_locked(src_ni, cpt);
lnet_net_unlock(cpt);
LCONSOLE_WARN("No route to %s via from %s\n",
libcfs_nid2str(dst_nid),
libcfs_nid2str(src_nid));
return -EINVAL;
}
LASSERT(src_nid != LNET_NID_ANY);
lnet_msg_commit(msg, cpt);
if (!msg->msg_routing)
msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
if (src_ni == the_lnet.ln_loni) {
/* No send credit hassles with LOLND */
lnet_net_unlock(cpt);
lnet_ni_send(src_ni, msg);
lnet_net_lock(cpt);
lnet_ni_decref_locked(src_ni, cpt);
lnet_net_unlock(cpt);
return 0;
}
rc = lnet_nid2peer_locked(&lp, dst_nid, cpt);
/* lp has ref on src_ni; lose mine */
lnet_ni_decref_locked(src_ni, cpt);
if (rc) {
lnet_net_unlock(cpt);
LCONSOLE_WARN("Error %d finding peer %s\n", rc,
libcfs_nid2str(dst_nid));
/* ENOMEM or shutting down */
return rc;
}
LASSERT(lp->lp_ni == src_ni);
} else {
/* sending to a remote network */
lp = lnet_find_route_locked(src_ni, dst_nid, rtr_nid);
if (!lp) {
if (src_ni)
lnet_ni_decref_locked(src_ni, cpt);
lnet_net_unlock(cpt);
LCONSOLE_WARN("No route to %s via %s (all routers down)\n",
libcfs_id2str(msg->msg_target),
libcfs_nid2str(src_nid));
return -EHOSTUNREACH;
}
/*
* rtr_nid is LNET_NID_ANY or NID of pre-determined router,
* it's possible that rtr_nid isn't LNET_NID_ANY and lp isn't
* pre-determined router, this can happen if router table
* was changed when we release the lock
*/
if (rtr_nid != lp->lp_nid) {
cpt2 = lnet_cpt_of_nid_locked(lp->lp_nid);
if (cpt2 != cpt) {
if (src_ni)
lnet_ni_decref_locked(src_ni, cpt);
lnet_net_unlock(cpt);
rtr_nid = lp->lp_nid;
cpt = cpt2;
goto again;
}
}
CDEBUG(D_NET, "Best route to %s via %s for %s %d\n",
libcfs_nid2str(dst_nid), libcfs_nid2str(lp->lp_nid),
lnet_msgtyp2str(msg->msg_type), msg->msg_len);
if (!src_ni) {
src_ni = lp->lp_ni;
src_nid = src_ni->ni_nid;
} else {
LASSERT(src_ni == lp->lp_ni);
lnet_ni_decref_locked(src_ni, cpt);
}
lnet_peer_addref_locked(lp);
LASSERT(src_nid != LNET_NID_ANY);
lnet_msg_commit(msg, cpt);
if (!msg->msg_routing) {
/* I'm the source and now I know which NI to send on */
msg->msg_hdr.src_nid = cpu_to_le64(src_nid);
}
msg->msg_target_is_router = 1;
msg->msg_target.nid = lp->lp_nid;
msg->msg_target.pid = LNET_PID_LUSTRE;
}
/* 'lp' is our best choice of peer */
LASSERT(!msg->msg_peertxcredit);
LASSERT(!msg->msg_txcredit);
LASSERT(!msg->msg_txpeer);
msg->msg_txpeer = lp; /* msg takes my ref on lp */
rc = lnet_post_send_locked(msg, 0);
lnet_net_unlock(cpt);
if (rc < 0)
return rc;
if (rc == LNET_CREDIT_OK)
lnet_ni_send(src_ni, msg);
return 0; /* rc == LNET_CREDIT_OK or LNET_CREDIT_WAIT */
}
void
lnet_drop_message(struct lnet_ni *ni, int cpt, void *private, unsigned int nob)
{
lnet_net_lock(cpt);
the_lnet.ln_counters[cpt]->drop_count++;
the_lnet.ln_counters[cpt]->drop_length += nob;
lnet_net_unlock(cpt);
lnet_ni_recv(ni, private, NULL, 0, 0, 0, nob);
}
static void
lnet_recv_put(struct lnet_ni *ni, struct lnet_msg *msg)
{
struct lnet_hdr *hdr = &msg->msg_hdr;
if (msg->msg_wanted)
lnet_setpayloadbuffer(msg);
lnet_build_msg_event(msg, LNET_EVENT_PUT);
/*
* Must I ACK? If so I'll grab the ack_wmd out of the header and put
* it back into the ACK during lnet_finalize()
*/
msg->msg_ack = !lnet_is_wire_handle_none(&hdr->msg.put.ack_wmd) &&
!(msg->msg_md->md_options & LNET_MD_ACK_DISABLE);
lnet_ni_recv(ni, msg->msg_private, msg, msg->msg_rx_delayed,
msg->msg_offset, msg->msg_wanted, hdr->payload_length);
}
static int
lnet_parse_put(struct lnet_ni *ni, struct lnet_msg *msg)
{
struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_match_info info;
bool ready_delay;
int rc;
/* Convert put fields to host byte order */
le64_to_cpus(&hdr->msg.put.match_bits);
le32_to_cpus(&hdr->msg.put.ptl_index);
le32_to_cpus(&hdr->msg.put.offset);
info.mi_id.nid = hdr->src_nid;
info.mi_id.pid = hdr->src_pid;
info.mi_opc = LNET_MD_OP_PUT;
info.mi_portal = hdr->msg.put.ptl_index;
info.mi_rlength = hdr->payload_length;
info.mi_roffset = hdr->msg.put.offset;
info.mi_mbits = hdr->msg.put.match_bits;
msg->msg_rx_ready_delay = !ni->ni_lnd->lnd_eager_recv;
ready_delay = msg->msg_rx_ready_delay;
again:
rc = lnet_ptl_match_md(&info, msg);
switch (rc) {
default:
LBUG();
case LNET_MATCHMD_OK:
lnet_recv_put(ni, msg);
return 0;
case LNET_MATCHMD_NONE:
/**
* no eager_recv or has already called it, should
* have been attached on delayed list
*/
if (ready_delay)
return 0;
rc = lnet_ni_eager_recv(ni, msg);
if (!rc) {
ready_delay = true;
goto again;
}
/* fall through */
case LNET_MATCHMD_DROP:
CNETERR("Dropping PUT from %s portal %d match %llu offset %d length %d: %d\n",
libcfs_id2str(info.mi_id), info.mi_portal,
info.mi_mbits, info.mi_roffset, info.mi_rlength, rc);
return -ENOENT; /* -ve: OK but no match */
}
}
static int
lnet_parse_get(struct lnet_ni *ni, struct lnet_msg *msg, int rdma_get)
{
struct lnet_match_info info;
struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_handle_wire reply_wmd;
int rc;
/* Convert get fields to host byte order */
le64_to_cpus(&hdr->msg.get.match_bits);
le32_to_cpus(&hdr->msg.get.ptl_index);
le32_to_cpus(&hdr->msg.get.sink_length);
le32_to_cpus(&hdr->msg.get.src_offset);
info.mi_id.nid = hdr->src_nid;
info.mi_id.pid = hdr->src_pid;
info.mi_opc = LNET_MD_OP_GET;
info.mi_portal = hdr->msg.get.ptl_index;
info.mi_rlength = hdr->msg.get.sink_length;
info.mi_roffset = hdr->msg.get.src_offset;
info.mi_mbits = hdr->msg.get.match_bits;
rc = lnet_ptl_match_md(&info, msg);
if (rc == LNET_MATCHMD_DROP) {
CNETERR("Dropping GET from %s portal %d match %llu offset %d length %d\n",
libcfs_id2str(info.mi_id), info.mi_portal,
info.mi_mbits, info.mi_roffset, info.mi_rlength);
return -ENOENT; /* -ve: OK but no match */
}
LASSERT(rc == LNET_MATCHMD_OK);
lnet_build_msg_event(msg, LNET_EVENT_GET);
reply_wmd = hdr->msg.get.return_wmd;
lnet_prep_send(msg, LNET_MSG_REPLY, info.mi_id,
msg->msg_offset, msg->msg_wanted);
msg->msg_hdr.msg.reply.dst_wmd = reply_wmd;
if (rdma_get) {
/* The LND completes the REPLY from her recv procedure */
lnet_ni_recv(ni, msg->msg_private, msg, 0,
msg->msg_offset, msg->msg_len, msg->msg_len);
return 0;
}
lnet_ni_recv(ni, msg->msg_private, NULL, 0, 0, 0, 0);
msg->msg_receiving = 0;
rc = lnet_send(ni->ni_nid, msg, LNET_NID_ANY);
if (rc < 0) {
/* didn't get as far as lnet_ni_send() */
CERROR("%s: Unable to send REPLY for GET from %s: %d\n",
libcfs_nid2str(ni->ni_nid),
libcfs_id2str(info.mi_id), rc);
lnet_finalize(ni, msg, rc);
}
return 0;
}
static int
lnet_parse_reply(struct lnet_ni *ni, struct lnet_msg *msg)
{
void *private = msg->msg_private;
struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_process_id src = {0};
struct lnet_libmd *md;
int rlength;
int mlength;
int cpt;
cpt = lnet_cpt_of_cookie(hdr->msg.reply.dst_wmd.wh_object_cookie);
lnet_res_lock(cpt);
src.nid = hdr->src_nid;
src.pid = hdr->src_pid;
/* NB handles only looked up by creator (no flips) */
md = lnet_wire_handle2md(&hdr->msg.reply.dst_wmd);
if (!md || !md->md_threshold || md->md_me) {
CNETERR("%s: Dropping REPLY from %s for %s MD %#llx.%#llx\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
!md ? "invalid" : "inactive",
hdr->msg.reply.dst_wmd.wh_interface_cookie,
hdr->msg.reply.dst_wmd.wh_object_cookie);
if (md && md->md_me)
CERROR("REPLY MD also attached to portal %d\n",
md->md_me->me_portal);
lnet_res_unlock(cpt);
return -ENOENT; /* -ve: OK but no match */
}
LASSERT(!md->md_offset);
rlength = hdr->payload_length;
mlength = min_t(uint, rlength, md->md_length);
if (mlength < rlength &&
!(md->md_options & LNET_MD_TRUNCATE)) {
CNETERR("%s: Dropping REPLY from %s length %d for MD %#llx would overflow (%d)\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
rlength, hdr->msg.reply.dst_wmd.wh_object_cookie,
mlength);
lnet_res_unlock(cpt);
return -ENOENT; /* -ve: OK but no match */
}
CDEBUG(D_NET, "%s: Reply from %s of length %d/%d into md %#llx\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
mlength, rlength, hdr->msg.reply.dst_wmd.wh_object_cookie);
lnet_msg_attach_md(msg, md, 0, mlength);
if (mlength)
lnet_setpayloadbuffer(msg);
lnet_res_unlock(cpt);
lnet_build_msg_event(msg, LNET_EVENT_REPLY);
lnet_ni_recv(ni, private, msg, 0, 0, mlength, rlength);
return 0;
}
static int
lnet_parse_ack(struct lnet_ni *ni, struct lnet_msg *msg)
{
struct lnet_hdr *hdr = &msg->msg_hdr;
struct lnet_process_id src = {0};
struct lnet_libmd *md;
int cpt;
src.nid = hdr->src_nid;
src.pid = hdr->src_pid;
/* Convert ack fields to host byte order */
le64_to_cpus(&hdr->msg.ack.match_bits);
le32_to_cpus(&hdr->msg.ack.mlength);
cpt = lnet_cpt_of_cookie(hdr->msg.ack.dst_wmd.wh_object_cookie);
lnet_res_lock(cpt);
/* NB handles only looked up by creator (no flips) */
md = lnet_wire_handle2md(&hdr->msg.ack.dst_wmd);
if (!md || !md->md_threshold || md->md_me) {
/* Don't moan; this is expected */
CDEBUG(D_NET,
"%s: Dropping ACK from %s to %s MD %#llx.%#llx\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
!md ? "invalid" : "inactive",
hdr->msg.ack.dst_wmd.wh_interface_cookie,
hdr->msg.ack.dst_wmd.wh_object_cookie);
if (md && md->md_me)
CERROR("Source MD also attached to portal %d\n",
md->md_me->me_portal);
lnet_res_unlock(cpt);
return -ENOENT; /* -ve! */
}
CDEBUG(D_NET, "%s: ACK from %s into md %#llx\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(src),
hdr->msg.ack.dst_wmd.wh_object_cookie);
lnet_msg_attach_md(msg, md, 0, 0);
lnet_res_unlock(cpt);
lnet_build_msg_event(msg, LNET_EVENT_ACK);
lnet_ni_recv(ni, msg->msg_private, msg, 0, 0, 0, msg->msg_len);
return 0;
}
/**
* \retval LNET_CREDIT_OK If \a msg is forwarded
* \retval LNET_CREDIT_WAIT If \a msg is blocked because w/o buffer
* \retval -ve error code
*/
int
lnet_parse_forward_locked(struct lnet_ni *ni, struct lnet_msg *msg)
{
int rc = 0;
if (!the_lnet.ln_routing)
return -ECANCELED;
if (msg->msg_rxpeer->lp_rtrcredits <= 0 ||
lnet_msg2bufpool(msg)->rbp_credits <= 0) {
if (!ni->ni_lnd->lnd_eager_recv) {
msg->msg_rx_ready_delay = 1;
} else {
lnet_net_unlock(msg->msg_rx_cpt);
rc = lnet_ni_eager_recv(ni, msg);
lnet_net_lock(msg->msg_rx_cpt);
}
}
if (!rc)
rc = lnet_post_routed_recv_locked(msg, 0);
return rc;
}
int
lnet_parse_local(struct lnet_ni *ni, struct lnet_msg *msg)
{
int rc;
switch (msg->msg_type) {
case LNET_MSG_ACK:
rc = lnet_parse_ack(ni, msg);
break;
case LNET_MSG_PUT:
rc = lnet_parse_put(ni, msg);
break;
case LNET_MSG_GET:
rc = lnet_parse_get(ni, msg, msg->msg_rdma_get);
break;
case LNET_MSG_REPLY:
rc = lnet_parse_reply(ni, msg);
break;
default: /* prevent an unused label if !kernel */
LASSERT(0);
return -EPROTO;
}
LASSERT(!rc || rc == -ENOENT);
return rc;
}
char *
lnet_msgtyp2str(int type)
{
switch (type) {
case LNET_MSG_ACK:
return "ACK";
case LNET_MSG_PUT:
return "PUT";
case LNET_MSG_GET:
return "GET";
case LNET_MSG_REPLY:
return "REPLY";
case LNET_MSG_HELLO:
return "HELLO";
default:
return "<UNKNOWN>";
}
}
void
lnet_print_hdr(struct lnet_hdr *hdr)
{
struct lnet_process_id src = {0};
struct lnet_process_id dst = {0};
char *type_str = lnet_msgtyp2str(hdr->type);
src.nid = hdr->src_nid;
src.pid = hdr->src_pid;
dst.nid = hdr->dest_nid;
dst.pid = hdr->dest_pid;
CWARN("P3 Header at %p of type %s\n", hdr, type_str);
CWARN(" From %s\n", libcfs_id2str(src));
CWARN(" To %s\n", libcfs_id2str(dst));
switch (hdr->type) {
default:
break;
case LNET_MSG_PUT:
CWARN(" Ptl index %d, ack md %#llx.%#llx, match bits %llu\n",
hdr->msg.put.ptl_index,
hdr->msg.put.ack_wmd.wh_interface_cookie,
hdr->msg.put.ack_wmd.wh_object_cookie,
hdr->msg.put.match_bits);
CWARN(" Length %d, offset %d, hdr data %#llx\n",
hdr->payload_length, hdr->msg.put.offset,
hdr->msg.put.hdr_data);
break;
case LNET_MSG_GET:
CWARN(" Ptl index %d, return md %#llx.%#llx, match bits %llu\n",
hdr->msg.get.ptl_index,
hdr->msg.get.return_wmd.wh_interface_cookie,
hdr->msg.get.return_wmd.wh_object_cookie,
hdr->msg.get.match_bits);
CWARN(" Length %d, src offset %d\n",
hdr->msg.get.sink_length,
hdr->msg.get.src_offset);
break;
case LNET_MSG_ACK:
CWARN(" dst md %#llx.%#llx, manipulated length %d\n",
hdr->msg.ack.dst_wmd.wh_interface_cookie,
hdr->msg.ack.dst_wmd.wh_object_cookie,
hdr->msg.ack.mlength);
break;
case LNET_MSG_REPLY:
CWARN(" dst md %#llx.%#llx, length %d\n",
hdr->msg.reply.dst_wmd.wh_interface_cookie,
hdr->msg.reply.dst_wmd.wh_object_cookie,
hdr->payload_length);
}
}
int
lnet_parse(struct lnet_ni *ni, struct lnet_hdr *hdr, lnet_nid_t from_nid,
void *private, int rdma_req)
{
int rc = 0;
int cpt;
int for_me;
struct lnet_msg *msg;
lnet_pid_t dest_pid;
lnet_nid_t dest_nid;
lnet_nid_t src_nid;
__u32 payload_length;
__u32 type;
LASSERT(!in_interrupt());
type = le32_to_cpu(hdr->type);
src_nid = le64_to_cpu(hdr->src_nid);
dest_nid = le64_to_cpu(hdr->dest_nid);
dest_pid = le32_to_cpu(hdr->dest_pid);
payload_length = le32_to_cpu(hdr->payload_length);
for_me = (ni->ni_nid == dest_nid);
cpt = lnet_cpt_of_nid(from_nid);
switch (type) {
case LNET_MSG_ACK:
case LNET_MSG_GET:
if (payload_length > 0) {
CERROR("%s, src %s: bad %s payload %d (0 expected)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
lnet_msgtyp2str(type), payload_length);
return -EPROTO;
}
break;
case LNET_MSG_PUT:
case LNET_MSG_REPLY:
if (payload_length >
(__u32)(for_me ? LNET_MAX_PAYLOAD : LNET_MTU)) {
CERROR("%s, src %s: bad %s payload %d (%d max expected)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
lnet_msgtyp2str(type),
payload_length,
for_me ? LNET_MAX_PAYLOAD : LNET_MTU);
return -EPROTO;
}
break;
default:
CERROR("%s, src %s: Bad message type 0x%x\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid), type);
return -EPROTO;
}
if (the_lnet.ln_routing &&
ni->ni_last_alive != ktime_get_real_seconds()) {
/* NB: so far here is the only place to set NI status to "up */
lnet_ni_lock(ni);
ni->ni_last_alive = ktime_get_real_seconds();
if (ni->ni_status &&
ni->ni_status->ns_status == LNET_NI_STATUS_DOWN)
ni->ni_status->ns_status = LNET_NI_STATUS_UP;
lnet_ni_unlock(ni);
}
/*
* Regard a bad destination NID as a protocol error. Senders should
* know what they're doing; if they don't they're misconfigured, buggy
* or malicious so we chop them off at the knees :)
*/
if (!for_me) {
if (LNET_NIDNET(dest_nid) == LNET_NIDNET(ni->ni_nid)) {
/* should have gone direct */
CERROR("%s, src %s: Bad dest nid %s (should have been sent direct)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
libcfs_nid2str(dest_nid));
return -EPROTO;
}
if (lnet_islocalnid(dest_nid)) {
/*
* dest is another local NI; sender should have used
* this node's NID on its own network
*/
CERROR("%s, src %s: Bad dest nid %s (it's my nid but on a different network)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
libcfs_nid2str(dest_nid));
return -EPROTO;
}
if (rdma_req && type == LNET_MSG_GET) {
CERROR("%s, src %s: Bad optimized GET for %s (final destination must be me)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
libcfs_nid2str(dest_nid));
return -EPROTO;
}
if (!the_lnet.ln_routing) {
CERROR("%s, src %s: Dropping message for %s (routing not enabled)\n",
libcfs_nid2str(from_nid),
libcfs_nid2str(src_nid),
libcfs_nid2str(dest_nid));
goto drop;
}
}
/*
* Message looks OK; we're not going to return an error, so we MUST
* call back lnd_recv() come what may...
*/
if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
fail_peer(src_nid, 0)) { /* shall we now? */
CERROR("%s, src %s: Dropping %s to simulate failure\n",
libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
lnet_msgtyp2str(type));
goto drop;
}
if (!list_empty(&the_lnet.ln_drop_rules) &&
lnet_drop_rule_match(hdr)) {
CDEBUG(D_NET, "%s, src %s, dst %s: Dropping %s to simulate silent message loss\n",
libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
libcfs_nid2str(dest_nid), lnet_msgtyp2str(type));
goto drop;
}
msg = lnet_msg_alloc();
if (!msg) {
CERROR("%s, src %s: Dropping %s (out of memory)\n",
libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
lnet_msgtyp2str(type));
goto drop;
}
/* msg zeroed in lnet_msg_alloc;
* i.e. flags all clear, pointers NULL etc
*/
msg->msg_type = type;
msg->msg_private = private;
msg->msg_receiving = 1;
msg->msg_rdma_get = rdma_req;
msg->msg_wanted = payload_length;
msg->msg_len = payload_length;
msg->msg_offset = 0;
msg->msg_hdr = *hdr;
/* for building message event */
msg->msg_from = from_nid;
if (!for_me) {
msg->msg_target.pid = dest_pid;
msg->msg_target.nid = dest_nid;
msg->msg_routing = 1;
} else {
/* convert common msg->hdr fields to host byteorder */
msg->msg_hdr.type = type;
msg->msg_hdr.src_nid = src_nid;
le32_to_cpus(&msg->msg_hdr.src_pid);
msg->msg_hdr.dest_nid = dest_nid;
msg->msg_hdr.dest_pid = dest_pid;
msg->msg_hdr.payload_length = payload_length;
}
lnet_net_lock(cpt);
rc = lnet_nid2peer_locked(&msg->msg_rxpeer, from_nid, cpt);
if (rc) {
lnet_net_unlock(cpt);
CERROR("%s, src %s: Dropping %s (error %d looking up sender)\n",
libcfs_nid2str(from_nid), libcfs_nid2str(src_nid),
lnet_msgtyp2str(type), rc);
lnet_msg_free(msg);
if (rc == -ESHUTDOWN)
/* We are shutting down. Don't do anything more */
return 0;
goto drop;
}
if (lnet_isrouter(msg->msg_rxpeer)) {
lnet_peer_set_alive(msg->msg_rxpeer);
if (avoid_asym_router_failure &&
LNET_NIDNET(src_nid) != LNET_NIDNET(from_nid)) {
/* received a remote message from router, update
* remote NI status on this router.
* NB: multi-hop routed message will be ignored.
*/
lnet_router_ni_update_locked(msg->msg_rxpeer,
LNET_NIDNET(src_nid));
}
}
lnet_msg_commit(msg, cpt);
/* message delay simulation */
if (unlikely(!list_empty(&the_lnet.ln_delay_rules) &&
lnet_delay_rule_match_locked(hdr, msg))) {
lnet_net_unlock(cpt);
return 0;
}
if (!for_me) {
rc = lnet_parse_forward_locked(ni, msg);
lnet_net_unlock(cpt);
if (rc < 0)
goto free_drop;
if (rc == LNET_CREDIT_OK) {
lnet_ni_recv(ni, msg->msg_private, msg, 0,
0, payload_length, payload_length);
}
return 0;
}
lnet_net_unlock(cpt);
rc = lnet_parse_local(ni, msg);
if (rc)
goto free_drop;
return 0;
free_drop:
LASSERT(!msg->msg_md);
lnet_finalize(ni, msg, rc);
drop:
lnet_drop_message(ni, cpt, private, payload_length);
return 0;
}
EXPORT_SYMBOL(lnet_parse);
void
lnet_drop_delayed_msg_list(struct list_head *head, char *reason)
{
while (!list_empty(head)) {
struct lnet_process_id id = {0};
struct lnet_msg *msg;
msg = list_entry(head->next, struct lnet_msg, msg_list);
list_del(&msg->msg_list);
id.nid = msg->msg_hdr.src_nid;
id.pid = msg->msg_hdr.src_pid;
LASSERT(!msg->msg_md);
LASSERT(msg->msg_rx_delayed);
LASSERT(msg->msg_rxpeer);
LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
CWARN("Dropping delayed PUT from %s portal %d match %llu offset %d length %d: %s\n",
libcfs_id2str(id),
msg->msg_hdr.msg.put.ptl_index,
msg->msg_hdr.msg.put.match_bits,
msg->msg_hdr.msg.put.offset,
msg->msg_hdr.payload_length, reason);
/*
* NB I can't drop msg's ref on msg_rxpeer until after I've
* called lnet_drop_message(), so I just hang onto msg as well
* until that's done
*/
lnet_drop_message(msg->msg_rxpeer->lp_ni,
msg->msg_rxpeer->lp_cpt,
msg->msg_private, msg->msg_len);
/*
* NB: message will not generate event because w/o attached MD,
* but we still should give error code so lnet_msg_decommit()
* can skip counters operations and other checks.
*/
lnet_finalize(msg->msg_rxpeer->lp_ni, msg, -ENOENT);
}
}
void
lnet_recv_delayed_msg_list(struct list_head *head)
{
while (!list_empty(head)) {
struct lnet_msg *msg;
struct lnet_process_id id;
msg = list_entry(head->next, struct lnet_msg, msg_list);
list_del(&msg->msg_list);
/*
* md won't disappear under me, since each msg
* holds a ref on it
*/
id.nid = msg->msg_hdr.src_nid;
id.pid = msg->msg_hdr.src_pid;
LASSERT(msg->msg_rx_delayed);
LASSERT(msg->msg_md);
LASSERT(msg->msg_rxpeer);
LASSERT(msg->msg_hdr.type == LNET_MSG_PUT);
CDEBUG(D_NET, "Resuming delayed PUT from %s portal %d match %llu offset %d length %d.\n",
libcfs_id2str(id), msg->msg_hdr.msg.put.ptl_index,
msg->msg_hdr.msg.put.match_bits,
msg->msg_hdr.msg.put.offset,
msg->msg_hdr.payload_length);
lnet_recv_put(msg->msg_rxpeer->lp_ni, msg);
}
}
/**
* Initiate an asynchronous PUT operation.
*
* There are several events associated with a PUT: completion of the send on
* the initiator node (LNET_EVENT_SEND), and when the send completes
* successfully, the receipt of an acknowledgment (LNET_EVENT_ACK) indicating
* that the operation was accepted by the target. The event LNET_EVENT_PUT is
* used at the target node to indicate the completion of incoming data
* delivery.
*
* The local events will be logged in the EQ associated with the MD pointed to
* by \a mdh handle. Using a MD without an associated EQ results in these
* events being discarded. In this case, the caller must have another
* mechanism (e.g., a higher level protocol) for determining when it is safe
* to modify the memory region associated with the MD.
*
* Note that LNet does not guarantee the order of LNET_EVENT_SEND and
* LNET_EVENT_ACK, though intuitively ACK should happen after SEND.
*
* \param self Indicates the NID of a local interface through which to send
* the PUT request. Use LNET_NID_ANY to let LNet choose one by itself.
* \param mdh A handle for the MD that describes the memory to be sent. The MD
* must be "free floating" (See LNetMDBind()).
* \param ack Controls whether an acknowledgment is requested.
* Acknowledgments are only sent when they are requested by the initiating
* process and the target MD enables them.
* \param target A process identifier for the target process.
* \param portal The index in the \a target's portal table.
* \param match_bits The match bits to use for MD selection at the target
* process.
* \param offset The offset into the target MD (only used when the target
* MD has the LNET_MD_MANAGE_REMOTE option set).
* \param hdr_data 64 bits of user data that can be included in the message
* header. This data is written to an event queue entry at the target if an
* EQ is present on the matching MD.
*
* \retval 0 Success, and only in this case events will be generated
* and logged to EQ (if it exists).
* \retval -EIO Simulated failure.
* \retval -ENOMEM Memory allocation failure.
* \retval -ENOENT Invalid MD object.
*
* \see lnet_event::hdr_data and lnet_event_kind.
*/
int
LNetPut(lnet_nid_t self, struct lnet_handle_md mdh, enum lnet_ack_req ack,
struct lnet_process_id target, unsigned int portal,
__u64 match_bits, unsigned int offset,
__u64 hdr_data)
{
struct lnet_msg *msg;
struct lnet_libmd *md;
int cpt;
int rc;
LASSERT(the_lnet.ln_refcount > 0);
if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
fail_peer(target.nid, 1)) { /* shall we now? */
CERROR("Dropping PUT to %s: simulated failure\n",
libcfs_id2str(target));
return -EIO;
}
msg = lnet_msg_alloc();
if (!msg) {
CERROR("Dropping PUT to %s: ENOMEM on struct lnet_msg\n",
libcfs_id2str(target));
return -ENOMEM;
}
msg->msg_vmflush = !!memory_pressure_get();
cpt = lnet_cpt_of_cookie(mdh.cookie);
lnet_res_lock(cpt);
md = lnet_handle2md(&mdh);
if (!md || !md->md_threshold || md->md_me) {
CERROR("Dropping PUT (%llu:%d:%s): MD (%d) invalid\n",
match_bits, portal, libcfs_id2str(target),
!md ? -1 : md->md_threshold);
if (md && md->md_me)
CERROR("Source MD also attached to portal %d\n",
md->md_me->me_portal);
lnet_res_unlock(cpt);
lnet_msg_free(msg);
return -ENOENT;
}
CDEBUG(D_NET, "%s -> %s\n", __func__, libcfs_id2str(target));
lnet_msg_attach_md(msg, md, 0, 0);
lnet_prep_send(msg, LNET_MSG_PUT, target, 0, md->md_length);
msg->msg_hdr.msg.put.match_bits = cpu_to_le64(match_bits);
msg->msg_hdr.msg.put.ptl_index = cpu_to_le32(portal);
msg->msg_hdr.msg.put.offset = cpu_to_le32(offset);
msg->msg_hdr.msg.put.hdr_data = hdr_data;
/* NB handles only looked up by creator (no flips) */
if (ack == LNET_ACK_REQ) {
msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
the_lnet.ln_interface_cookie;
msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
md->md_lh.lh_cookie;
} else {
msg->msg_hdr.msg.put.ack_wmd.wh_interface_cookie =
LNET_WIRE_HANDLE_COOKIE_NONE;
msg->msg_hdr.msg.put.ack_wmd.wh_object_cookie =
LNET_WIRE_HANDLE_COOKIE_NONE;
}
lnet_res_unlock(cpt);
lnet_build_msg_event(msg, LNET_EVENT_SEND);
rc = lnet_send(self, msg, LNET_NID_ANY);
if (rc) {
CNETERR("Error sending PUT to %s: %d\n",
libcfs_id2str(target), rc);
lnet_finalize(NULL, msg, rc);
}
/* completion will be signalled by an event */
return 0;
}
EXPORT_SYMBOL(LNetPut);
struct lnet_msg *
lnet_create_reply_msg(struct lnet_ni *ni, struct lnet_msg *getmsg)
{
/*
* The LND can DMA direct to the GET md (i.e. no REPLY msg). This
* returns a msg for the LND to pass to lnet_finalize() when the sink
* data has been received.
*
* CAVEAT EMPTOR: 'getmsg' is the original GET, which is freed when
* lnet_finalize() is called on it, so the LND must call this first
*/
struct lnet_msg *msg = lnet_msg_alloc();
struct lnet_libmd *getmd = getmsg->msg_md;
struct lnet_process_id peer_id = getmsg->msg_target;
int cpt;
LASSERT(!getmsg->msg_target_is_router);
LASSERT(!getmsg->msg_routing);
if (!msg) {
CERROR("%s: Dropping REPLY from %s: can't allocate msg\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id));
goto drop;
}
cpt = lnet_cpt_of_cookie(getmd->md_lh.lh_cookie);
lnet_res_lock(cpt);
LASSERT(getmd->md_refcount > 0);
if (!getmd->md_threshold) {
CERROR("%s: Dropping REPLY from %s for inactive MD %p\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id),
getmd);
lnet_res_unlock(cpt);
goto drop;
}
LASSERT(!getmd->md_offset);
CDEBUG(D_NET, "%s: Reply from %s md %p\n",
libcfs_nid2str(ni->ni_nid), libcfs_id2str(peer_id), getmd);
/* setup information for lnet_build_msg_event */
msg->msg_from = peer_id.nid;
msg->msg_type = LNET_MSG_GET; /* flag this msg as an "optimized" GET */
msg->msg_hdr.src_nid = peer_id.nid;
msg->msg_hdr.payload_length = getmd->md_length;
msg->msg_receiving = 1; /* required by lnet_msg_attach_md */
lnet_msg_attach_md(msg, getmd, getmd->md_offset, getmd->md_length);
lnet_res_unlock(cpt);
cpt = lnet_cpt_of_nid(peer_id.nid);
lnet_net_lock(cpt);
lnet_msg_commit(msg, cpt);
lnet_net_unlock(cpt);
lnet_build_msg_event(msg, LNET_EVENT_REPLY);
return msg;
drop:
cpt = lnet_cpt_of_nid(peer_id.nid);
lnet_net_lock(cpt);
the_lnet.ln_counters[cpt]->drop_count++;
the_lnet.ln_counters[cpt]->drop_length += getmd->md_length;
lnet_net_unlock(cpt);
if (msg)
lnet_msg_free(msg);
return NULL;
}
EXPORT_SYMBOL(lnet_create_reply_msg);
void
lnet_set_reply_msg_len(struct lnet_ni *ni, struct lnet_msg *reply,
unsigned int len)
{
/*
* Set the REPLY length, now the RDMA that elides the REPLY message has
* completed and I know it.
*/
LASSERT(reply);
LASSERT(reply->msg_type == LNET_MSG_GET);
LASSERT(reply->msg_ev.type == LNET_EVENT_REPLY);
/*
* NB I trusted my peer to RDMA. If she tells me she's written beyond
* the end of my buffer, I might as well be dead.
*/
LASSERT(len <= reply->msg_ev.mlength);
reply->msg_ev.mlength = len;
}
EXPORT_SYMBOL(lnet_set_reply_msg_len);
/**
* Initiate an asynchronous GET operation.
*
* On the initiator node, an LNET_EVENT_SEND is logged when the GET request
* is sent, and an LNET_EVENT_REPLY is logged when the data returned from
* the target node in the REPLY has been written to local MD.
*
* On the target node, an LNET_EVENT_GET is logged when the GET request
* arrives and is accepted into a MD.
*
* \param self,target,portal,match_bits,offset See the discussion in LNetPut().
* \param mdh A handle for the MD that describes the memory into which the
* requested data will be received. The MD must be "free floating"
* (See LNetMDBind()).
*
* \retval 0 Success, and only in this case events will be generated
* and logged to EQ (if it exists) of the MD.
* \retval -EIO Simulated failure.
* \retval -ENOMEM Memory allocation failure.
* \retval -ENOENT Invalid MD object.
*/
int
LNetGet(lnet_nid_t self, struct lnet_handle_md mdh,
struct lnet_process_id target, unsigned int portal,
__u64 match_bits, unsigned int offset)
{
struct lnet_msg *msg;
struct lnet_libmd *md;
int cpt;
int rc;
LASSERT(the_lnet.ln_refcount > 0);
if (!list_empty(&the_lnet.ln_test_peers) && /* normally we don't */
fail_peer(target.nid, 1)) { /* shall we now? */
CERROR("Dropping GET to %s: simulated failure\n",
libcfs_id2str(target));
return -EIO;
}
msg = lnet_msg_alloc();
if (!msg) {
CERROR("Dropping GET to %s: ENOMEM on struct lnet_msg\n",
libcfs_id2str(target));
return -ENOMEM;
}
cpt = lnet_cpt_of_cookie(mdh.cookie);
lnet_res_lock(cpt);
md = lnet_handle2md(&mdh);
if (!md || !md->md_threshold || md->md_me) {
CERROR("Dropping GET (%llu:%d:%s): MD (%d) invalid\n",
match_bits, portal, libcfs_id2str(target),
!md ? -1 : md->md_threshold);
if (md && md->md_me)
CERROR("REPLY MD also attached to portal %d\n",
md->md_me->me_portal);
lnet_res_unlock(cpt);
lnet_msg_free(msg);
return -ENOENT;
}
CDEBUG(D_NET, "%s -> %s\n", __func__, libcfs_id2str(target));
lnet_msg_attach_md(msg, md, 0, 0);
lnet_prep_send(msg, LNET_MSG_GET, target, 0, 0);
msg->msg_hdr.msg.get.match_bits = cpu_to_le64(match_bits);
msg->msg_hdr.msg.get.ptl_index = cpu_to_le32(portal);
msg->msg_hdr.msg.get.src_offset = cpu_to_le32(offset);
msg->msg_hdr.msg.get.sink_length = cpu_to_le32(md->md_length);
/* NB handles only looked up by creator (no flips) */
msg->msg_hdr.msg.get.return_wmd.wh_interface_cookie =
the_lnet.ln_interface_cookie;
msg->msg_hdr.msg.get.return_wmd.wh_object_cookie =
md->md_lh.lh_cookie;
lnet_res_unlock(cpt);
lnet_build_msg_event(msg, LNET_EVENT_SEND);
rc = lnet_send(self, msg, LNET_NID_ANY);
if (rc < 0) {
CNETERR("Error sending GET to %s: %d\n",
libcfs_id2str(target), rc);
lnet_finalize(NULL, msg, rc);
}
/* completion will be signalled by an event */
return 0;
}
EXPORT_SYMBOL(LNetGet);
/**
* Calculate distance to node at \a dstnid.
*
* \param dstnid Target NID.
* \param srcnidp If not NULL, NID of the local interface to reach \a dstnid
* is saved here.
* \param orderp If not NULL, order of the route to reach \a dstnid is saved
* here.
*
* \retval 0 If \a dstnid belongs to a local interface, and reserved option
* local_nid_dist_zero is set, which is the default.
* \retval positives Distance to target NID, i.e. number of hops plus one.
* \retval -EHOSTUNREACH If \a dstnid is not reachable.
*/
int
LNetDist(lnet_nid_t dstnid, lnet_nid_t *srcnidp, __u32 *orderp)
{
struct list_head *e;
struct lnet_ni *ni;
struct lnet_remotenet *rnet;
__u32 dstnet = LNET_NIDNET(dstnid);
int hops;
int cpt;
__u32 order = 2;
struct list_head *rn_list;
/*
* if !local_nid_dist_zero, I don't return a distance of 0 ever
* (when lustre sees a distance of 0, it substitutes 0@lo), so I
* keep order 0 free for 0@lo and order 1 free for a local NID
* match
*/
LASSERT(the_lnet.ln_refcount > 0);
cpt = lnet_net_lock_current();
list_for_each(e, &the_lnet.ln_nis) {
ni = list_entry(e, struct lnet_ni, ni_list);
if (ni->ni_nid == dstnid) {
if (srcnidp)
*srcnidp = dstnid;
if (orderp) {
if (LNET_NETTYP(LNET_NIDNET(dstnid)) == LOLND)
*orderp = 0;
else
*orderp = 1;
}
lnet_net_unlock(cpt);
return local_nid_dist_zero ? 0 : 1;
}
if (LNET_NIDNET(ni->ni_nid) == dstnet) {
/*
* Check if ni was originally created in
* current net namespace.
* If not, assign order above 0xffff0000,
* to make this ni not a priority.
*/
if (!net_eq(ni->ni_net_ns, current->nsproxy->net_ns))
order += 0xffff0000;
if (srcnidp)
*srcnidp = ni->ni_nid;
if (orderp)
*orderp = order;
lnet_net_unlock(cpt);
return 1;
}
order++;
}
rn_list = lnet_net2rnethash(dstnet);
list_for_each(e, rn_list) {
rnet = list_entry(e, struct lnet_remotenet, lrn_list);
if (rnet->lrn_net == dstnet) {
struct lnet_route *route;
struct lnet_route *shortest = NULL;
__u32 shortest_hops = LNET_UNDEFINED_HOPS;
__u32 route_hops;
LASSERT(!list_empty(&rnet->lrn_routes));
list_for_each_entry(route, &rnet->lrn_routes,
lr_list) {
route_hops = route->lr_hops;
if (route_hops == LNET_UNDEFINED_HOPS)
route_hops = 1;
if (!shortest ||
route_hops < shortest_hops) {
shortest = route;
shortest_hops = route_hops;
}
}
LASSERT(shortest);
hops = shortest_hops;
if (srcnidp)
*srcnidp = shortest->lr_gateway->lp_ni->ni_nid;
if (orderp)
*orderp = order;
lnet_net_unlock(cpt);
return hops + 1;
}
order++;
}
lnet_net_unlock(cpt);
return -EHOSTUNREACH;
}
EXPORT_SYMBOL(LNetDist);