Viewing: peer.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, 2017, Intel Corporation.
*/
/* This file is part of Lustre, http://www.lustre.org/ */
#define DEBUG_SUBSYSTEM S_LNET
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <lustre_compat/linux/string.h>
#include <linux/uaccess.h>
#include <linux/libcfs/libcfs.h>
#include <linux/lnet/lib-lnet.h>
#include <uapi/linux/lnet/lnet-dlc.h>
#include <udsp.h>
/* Value indicating that recovery needs to re-check a peer immediately. */
#define LNET_REDISCOVER_PEER (1)
static int lnet_peer_queue_for_discovery(struct lnet_peer *lp);
static int lnet_add_peer_ni(struct lnet_nid *prim_nid, struct lnet_nid *nid, bool mr,
unsigned int flags);
static void
lnet_peer_remove_from_remote_list(struct lnet_peer_ni *lpni)
{
if (!list_empty(&lpni->lpni_on_remote_peer_ni_list)) {
list_del_init(&lpni->lpni_on_remote_peer_ni_list);
lnet_peer_ni_decref_locked(lpni);
}
}
void
lnet_peer_net_added(struct lnet_net *net)
{
struct lnet_peer_ni *lpni, *tmp;
list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
lpni_on_remote_peer_ni_list) {
if (LNET_NID_NET(&lpni->lpni_nid) == net->net_id) {
lpni->lpni_net = net;
spin_lock(&lpni->lpni_lock);
lpni->lpni_txcredits =
lpni->lpni_net->net_tunables.lct_peer_tx_credits;
lpni->lpni_mintxcredits = lpni->lpni_txcredits;
lpni->lpni_rtrcredits =
lnet_peer_buffer_credits(lpni->lpni_net);
lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
spin_unlock(&lpni->lpni_lock);
lnet_peer_remove_from_remote_list(lpni);
}
}
}
static void
lnet_peer_tables_destroy(void)
{
struct lnet_peer_table *ptable;
struct list_head *hash;
int i;
int j;
if (!the_lnet.ln_peer_tables)
return;
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
hash = ptable->pt_hash;
if (!hash) /* not intialized */
break;
LASSERT(list_empty(&ptable->pt_zombie_list));
ptable->pt_hash = NULL;
for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
LASSERT(list_empty(&hash[j]));
CFS_FREE_PTR_ARRAY(hash, LNET_PEER_HASH_SIZE);
}
cfs_percpt_free(the_lnet.ln_peer_tables);
the_lnet.ln_peer_tables = NULL;
}
int
lnet_peer_tables_create(void)
{
struct lnet_peer_table *ptable;
struct list_head *hash;
int i;
int j;
the_lnet.ln_peer_tables = cfs_percpt_alloc(lnet_cpt_table(),
sizeof(*ptable));
if (the_lnet.ln_peer_tables == NULL) {
CERROR("Failed to allocate cpu-partition peer tables\n");
return -ENOMEM;
}
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
LNET_PEER_HASH_SIZE * sizeof(*hash));
if (hash == NULL) {
CERROR("Failed to create peer hash table\n");
lnet_peer_tables_destroy();
return -ENOMEM;
}
spin_lock_init(&ptable->pt_zombie_lock);
INIT_LIST_HEAD(&ptable->pt_zombie_list);
INIT_LIST_HEAD(&ptable->pt_peer_list);
for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
INIT_LIST_HEAD(&hash[j]);
ptable->pt_hash = hash; /* sign of initialization */
}
return 0;
}
static struct lnet_peer_ni *
lnet_peer_ni_alloc(struct lnet_nid *nid)
{
struct lnet_peer_ni *lpni;
struct lnet_net *net;
int cpt;
cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
LIBCFS_CPT_ALLOC(lpni, lnet_cpt_table(), cpt, sizeof(*lpni));
if (!lpni)
return NULL;
INIT_LIST_HEAD(&lpni->lpni_txq);
INIT_LIST_HEAD(&lpni->lpni_hashlist);
INIT_LIST_HEAD(&lpni->lpni_peer_nis);
INIT_LIST_HEAD(&lpni->lpni_recovery);
INIT_LIST_HEAD(&lpni->lpni_on_remote_peer_ni_list);
INIT_LIST_HEAD(&lpni->lpni_rtr_pref_nids);
LNetInvalidateMDHandle(&lpni->lpni_recovery_ping_mdh);
kref_init(&lpni->lpni_kref);
lpni->lpni_sel_priority = LNET_MAX_SELECTION_PRIORITY;
spin_lock_init(&lpni->lpni_lock);
if (lnet_peers_start_down())
lpni->lpni_ns_status = LNET_NI_STATUS_DOWN;
else
lpni->lpni_ns_status = LNET_NI_STATUS_UP;
lpni->lpni_ping_feats = LNET_PING_FEAT_INVAL;
lpni->lpni_nid = *nid;
lpni->lpni_cpt = cpt;
atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
lpni->lpni_notified = false;
net = lnet_get_net_locked(LNET_NID_NET(nid));
lpni->lpni_net = net;
if (net) {
lpni->lpni_txcredits = net->net_tunables.lct_peer_tx_credits;
lpni->lpni_mintxcredits = lpni->lpni_txcredits;
lpni->lpni_rtrcredits = lnet_peer_buffer_credits(net);
lpni->lpni_minrtrcredits = lpni->lpni_rtrcredits;
} else {
/*
* This peer_ni is not on a local network, so we
* cannot add the credits here. In case the net is
* added later, add the peer_ni to the remote peer ni
* list so it can be easily found and revisited.
*/
/* FIXME: per-net implementation instead? */
kref_get(&lpni->lpni_kref);
list_add_tail(&lpni->lpni_on_remote_peer_ni_list,
&the_lnet.ln_remote_peer_ni_list);
}
CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nidstr(&lpni->lpni_nid));
return lpni;
}
static struct lnet_peer_net *
lnet_peer_net_alloc(__u32 net_id)
{
struct lnet_peer_net *lpn;
LIBCFS_CPT_ALLOC(lpn, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lpn));
if (!lpn)
return NULL;
INIT_LIST_HEAD(&lpn->lpn_peer_nets);
INIT_LIST_HEAD(&lpn->lpn_peer_nis);
lpn->lpn_net_id = net_id;
lpn->lpn_sel_priority = LNET_MAX_SELECTION_PRIORITY;
CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
return lpn;
}
void
lnet_destroy_peer_net_locked(struct lnet_peer_net *lpn)
{
struct lnet_peer *lp;
CDEBUG(D_NET, "%p net %s\n", lpn, libcfs_net2str(lpn->lpn_net_id));
LASSERT(atomic_read(&lpn->lpn_refcount) == 0);
LASSERT(list_empty(&lpn->lpn_peer_nis));
LASSERT(list_empty(&lpn->lpn_peer_nets));
lp = lpn->lpn_peer;
lpn->lpn_peer = NULL;
LIBCFS_FREE(lpn, sizeof(*lpn));
lnet_peer_decref_locked(lp);
}
static struct lnet_peer *
lnet_peer_alloc(struct lnet_nid *nid)
{
struct lnet_peer *lp;
LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), CFS_CPT_ANY, sizeof(*lp));
if (!lp)
return NULL;
INIT_LIST_HEAD(&lp->lp_rtrq);
INIT_LIST_HEAD(&lp->lp_routes);
INIT_LIST_HEAD(&lp->lp_peer_list);
INIT_LIST_HEAD(&lp->lp_peer_nets);
INIT_LIST_HEAD(&lp->lp_dc_list);
INIT_LIST_HEAD(&lp->lp_dc_pendq);
INIT_LIST_HEAD(&lp->lp_rtr_list);
init_waitqueue_head(&lp->lp_dc_waitq);
spin_lock_init(&lp->lp_lock);
lp->lp_primary_nid = *nid;
lp->lp_disc_src_nid = LNET_ANY_NID;
lp->lp_disc_dst_nid = LNET_ANY_NID;
lp->lp_merge_primary_nid = LNET_ANY_NID;
if (lnet_peers_start_down())
lp->lp_alive = false;
else
lp->lp_alive = true;
/*
* Turn off discovery for loopback peer. If you're creating a peer
* for the loopback interface then that was initiated when we
* attempted to send a message over the loopback. There is no need
* to ever use a different interface when sending messages to
* myself.
*/
if (nid_is_lo0(nid))
lp->lp_state = LNET_PEER_NO_DISCOVERY;
lp->lp_cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nidstr(&lp->lp_primary_nid));
return lp;
}
void
lnet_destroy_peer_locked(struct lnet_peer *lp)
{
CDEBUG(D_NET, "%p nid %s\n", lp, libcfs_nidstr(&lp->lp_primary_nid));
LASSERT(atomic_read(&lp->lp_refcount) == 0);
LASSERT(lp->lp_rtr_refcount == 0);
LASSERT(list_empty(&lp->lp_peer_nets));
LASSERT(list_empty(&lp->lp_peer_list));
LASSERT(list_empty(&lp->lp_dc_list));
if (lp->lp_data)
kref_put(&lp->lp_data->pb_refcnt, lnet_ping_buffer_free);
/*
* if there are messages still on the pending queue, then make
* sure to queue them on the ln_msg_resend list so they can be
* resent at a later point if the discovery thread is still
* running.
* If the discovery thread has stopped, then the wakeup will be a
* no-op, and it is expected the lnet_shutdown_lndnets() will
* eventually be called, which will traverse this list and
* finalize the messages on the list.
* We can not resend them now because we're holding the cpt lock.
* Releasing the lock can cause an inconsistent state
*/
spin_lock(&the_lnet.ln_msg_resend_lock);
spin_lock(&lp->lp_lock);
list_splice(&lp->lp_dc_pendq, &the_lnet.ln_msg_resend);
spin_unlock(&lp->lp_lock);
spin_unlock(&the_lnet.ln_msg_resend_lock);
wake_up(&the_lnet.ln_dc_waitq);
LIBCFS_FREE(lp, sizeof(*lp));
}
/*
* Detach a peer_ni from its peer_net. If this was the last peer_ni on
* that peer_net, detach the peer_net from the peer.
*
* Call with lnet_net_lock/EX held
*/
static void
lnet_peer_detach_peer_ni_locked(struct lnet_peer_ni *lpni)
{
struct lnet_peer_table *ptable;
struct lnet_peer_net *lpn;
struct lnet_peer *lp;
/*
* Belts and suspenders: gracefully handle teardown of a
* partially connected peer_ni.
*/
lpn = lpni->lpni_peer_net;
list_del_init(&lpni->lpni_peer_nis);
/*
* If there are no lpni's left, we detach lpn from
* lp_peer_nets, so it cannot be found anymore.
*/
if (list_empty(&lpn->lpn_peer_nis))
list_del_init(&lpn->lpn_peer_nets);
/* Update peer NID count. */
lp = lpn->lpn_peer;
lp->lp_nnis--;
/*
* If there are no more peer nets, make the peer unfindable
* via the peer_tables.
*
* Otherwise, if the peer is DISCOVERED, tell discovery to
* take another look at it. This is a no-op if discovery for
* this peer did the detaching.
*/
if (list_empty(&lp->lp_peer_nets)) {
list_del_init(&lp->lp_peer_list);
ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
ptable->pt_peers--;
} else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
/* Discovery isn't running, nothing to do here. */
} else if (lp->lp_state & LNET_PEER_DISCOVERED) {
lnet_peer_queue_for_discovery(lp);
wake_up(&the_lnet.ln_dc_waitq);
}
CDEBUG(D_NET, "peer %s NID %s\n",
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(&lpni->lpni_nid));
}
/* called with lnet_net_lock LNET_LOCK_EX held */
static int
lnet_peer_ni_del_locked(struct lnet_peer_ni *lpni, bool force)
{
struct lnet_peer_table *ptable = NULL;
/* don't remove a peer_ni if it's also a gateway */
if (lnet_isrouter(lpni) && !force) {
CERROR("Peer NI %s is a gateway. Can not delete it\n",
libcfs_nidstr(&lpni->lpni_nid));
return -EBUSY;
}
lnet_peer_remove_from_remote_list(lpni);
/* remove peer ni from the hash list. */
list_del_init(&lpni->lpni_hashlist);
/*
* indicate the peer is being deleted so the monitor thread can
* remove it from the recovery queue.
*/
spin_lock(&lpni->lpni_lock);
lpni->lpni_state |= LNET_PEER_NI_DELETING;
spin_unlock(&lpni->lpni_lock);
/* decrement the ref count on the peer table */
ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
/*
* The peer_ni can no longer be found with a lookup. But there
* can be current users, so keep track of it on the zombie
* list until the reference count has gone to zero.
*
* The last reference may be lost in a place where the
* lnet_net_lock locks only a single cpt, and that cpt may not
* be lpni->lpni_cpt. So the zombie list of lnet_peer_table
* has its own lock.
*/
spin_lock(&ptable->pt_zombie_lock);
list_add(&lpni->lpni_hashlist, &ptable->pt_zombie_list);
ptable->pt_zombies++;
spin_unlock(&ptable->pt_zombie_lock);
/* no need to keep this peer_ni on the hierarchy anymore */
lnet_peer_detach_peer_ni_locked(lpni);
/* remove hashlist reference on peer_ni */
lnet_peer_ni_decref_locked(lpni);
return 0;
}
void lnet_peer_uninit(void)
{
struct lnet_peer_ni *lpni, *tmp;
lnet_net_lock(LNET_LOCK_EX);
/* remove all peer_nis from the remote peer and the hash list */
list_for_each_entry_safe(lpni, tmp, &the_lnet.ln_remote_peer_ni_list,
lpni_on_remote_peer_ni_list)
lnet_peer_ni_del_locked(lpni, false);
lnet_peer_tables_destroy();
lnet_net_unlock(LNET_LOCK_EX);
}
static int
lnet_peer_del_locked(struct lnet_peer *peer)
{
struct lnet_peer_ni *lpni = NULL, *lpni2;
int rc = 0, rc2 = 0;
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&peer->lp_primary_nid));
spin_lock(&peer->lp_lock);
peer->lp_state |= LNET_PEER_MARK_DELETED;
spin_unlock(&peer->lp_lock);
lpni = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
while (lpni != NULL) {
lpni2 = lnet_get_next_peer_ni_locked(peer, NULL, lpni);
rc = lnet_peer_ni_del_locked(lpni, false);
if (rc != 0)
rc2 = rc;
lpni = lpni2;
}
return rc2;
}
/*
* Discovering this peer is taking too long. Cancel any Ping or Push
* that discovery is waiting on by unlinking the relevant MDs. The
* lnet_discovery_event_handler() will proceed from here and complete
* the cleanup.
*/
static void lnet_peer_cancel_discovery(struct lnet_peer *lp)
{
struct lnet_handle_md ping_mdh;
struct lnet_handle_md push_mdh;
LNetInvalidateMDHandle(&ping_mdh);
LNetInvalidateMDHandle(&push_mdh);
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_PING_SENT) {
ping_mdh = lp->lp_ping_mdh;
LNetInvalidateMDHandle(&lp->lp_ping_mdh);
}
if (lp->lp_state & LNET_PEER_PUSH_SENT) {
push_mdh = lp->lp_push_mdh;
LNetInvalidateMDHandle(&lp->lp_push_mdh);
}
spin_unlock(&lp->lp_lock);
if (!LNetMDHandleIsInvalid(ping_mdh))
LNetMDUnlink(ping_mdh);
if (!LNetMDHandleIsInvalid(push_mdh))
LNetMDUnlink(push_mdh);
}
static int
lnet_peer_del(struct lnet_peer *peer)
{
int rc;
lnet_peer_cancel_discovery(peer);
lnet_net_lock(LNET_LOCK_EX);
rc = lnet_peer_del_locked(peer);
lnet_net_unlock(LNET_LOCK_EX);
return rc;
}
/*
* Delete a NID from a peer. Call with ln_api_mutex held.
*
* Error codes:
* -EPERM: Non-DLC deletion from DLC-configured peer.
* -ENOENT: No lnet_peer_ni corresponding to the nid.
* -ECHILD: The lnet_peer_ni isn't connected to the peer.
* -EBUSY: The lnet_peer_ni is the primary, and not the only peer_ni.
*/
static int
lnet_peer_del_nid(struct lnet_peer *lp, struct lnet_nid *nid,
unsigned int flags)
{
struct lnet_peer_ni *lpni;
struct lnet_nid primary_nid = lp->lp_primary_nid;
int rc = 0;
bool force = (flags & LNET_PEER_RTR_NI_FORCE_DEL) ? true : false;
if (!(flags & LNET_PEER_CONFIGURED)) {
if (lp->lp_state & LNET_PEER_CONFIGURED) {
rc = -EPERM;
goto out;
}
}
/* If we're asked to lock down the primary NID we shouldn't be
* deleting it
*/
if (lp->lp_state & LNET_PEER_LOCK_PRIMARY &&
nid_same(&primary_nid, nid)) {
rc = -EPERM;
goto out;
}
lpni = lnet_peer_ni_find_locked(nid);
if (!lpni) {
rc = -ENOENT;
goto out;
}
if (lp != lpni->lpni_peer_net->lpn_peer) {
rc = -ECHILD;
lnet_peer_ni_decref_locked(lpni);
goto out;
}
/*
* This function only allows deletion of the primary NID if it
* is the only NID.
*/
if (nid_same(nid, &lp->lp_primary_nid) && lp->lp_nnis != 1 && !force) {
rc = -EBUSY;
lnet_peer_ni_decref_locked(lpni);
goto out;
}
lnet_net_lock(LNET_LOCK_EX);
if (nid_same(nid, &lp->lp_primary_nid) && lp->lp_nnis != 1 && force) {
struct lnet_peer_ni *lpni2;
/* assign the next peer_ni to be the primary */
lpni2 = lnet_get_next_peer_ni_locked(lp, NULL, lpni);
LASSERT(lpni2);
lp->lp_primary_nid = lpni2->lpni_nid;
}
rc = lnet_peer_ni_del_locked(lpni, force);
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
out:
CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
libcfs_nidstr(&primary_nid), libcfs_nidstr(nid),
flags, rc);
return rc;
}
static void
lnet_peer_table_cleanup_locked(struct lnet_net *net,
struct lnet_peer_table *ptable)
{
int i;
struct lnet_peer_ni *next;
struct lnet_peer_ni *lpni;
struct lnet_peer *peer;
for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
list_for_each_entry_safe(lpni, next, &ptable->pt_hash[i],
lpni_hashlist) {
if (net != NULL && net != lpni->lpni_net)
continue;
peer = lpni->lpni_peer_net->lpn_peer;
if (!nid_same(&peer->lp_primary_nid,
&lpni->lpni_nid)) {
lnet_peer_ni_del_locked(lpni, false);
continue;
}
/*
* Removing the primary NID implies removing
* the entire peer. Advance next beyond any
* peer_ni that belongs to the same peer.
*/
list_for_each_entry_from(next, &ptable->pt_hash[i],
lpni_hashlist) {
if (next->lpni_peer_net->lpn_peer != peer)
break;
}
lnet_peer_del_locked(peer);
}
}
}
static void
lnet_peer_ni_finalize_wait(struct lnet_peer_table *ptable)
{
wait_var_event_warning(&ptable->pt_zombies,
ptable->pt_zombies == 0,
"Waiting for %d zombies on peer table\n",
ptable->pt_zombies);
}
static void
lnet_peer_table_del_rtrs_locked(struct lnet_net *net,
struct lnet_peer_table *ptable)
{
struct lnet_peer_ni *lp;
struct lnet_peer_ni *tmp;
struct lnet_nid gw_nid;
int i;
for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
lpni_hashlist) {
if (net != lp->lpni_net)
continue;
if (!lnet_isrouter(lp))
continue;
gw_nid = lp->lpni_peer_net->lpn_peer->lp_primary_nid;
lnet_net_unlock(LNET_LOCK_EX);
lnet_del_route(LNET_NET_ANY, &gw_nid);
lnet_net_lock(LNET_LOCK_EX);
}
}
}
void
lnet_peer_tables_cleanup(struct lnet_net *net)
{
int i;
struct lnet_peer_table *ptable;
LASSERT(the_lnet.ln_state != LNET_STATE_SHUTDOWN || net != NULL);
/* If just deleting the peers for a NI, get rid of any routes these
* peers are gateways for. */
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_table_del_rtrs_locked(net, ptable);
lnet_net_unlock(LNET_LOCK_EX);
}
/* Start the cleanup process */
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_table_cleanup_locked(net, ptable);
lnet_net_unlock(LNET_LOCK_EX);
}
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables)
lnet_peer_ni_finalize_wait(ptable);
}
static struct lnet_peer_ni *
lnet_get_peer_ni_locked(struct lnet_peer_table *ptable, struct lnet_nid *nid)
{
struct list_head *peers;
struct lnet_peer_ni *lp;
if (the_lnet.ln_state != LNET_STATE_RUNNING)
return NULL;
peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
list_for_each_entry(lp, peers, lpni_hashlist) {
if (nid_same(&lp->lpni_nid, nid)) {
kref_get(&lp->lpni_kref);
return lp;
}
}
return NULL;
}
struct lnet_peer_ni *
lnet_peer_ni_find_locked(struct lnet_nid *nid)
{
struct lnet_peer_ni *lpni;
struct lnet_peer_table *ptable;
int cpt;
cpt = lnet_nid_cpt_hash(nid, LNET_CPT_NUMBER);
ptable = the_lnet.ln_peer_tables[cpt];
lpni = lnet_get_peer_ni_locked(ptable, nid);
return lpni;
}
struct lnet_peer_ni *
lnet_peer_ni_get_locked(struct lnet_peer *lp, struct lnet_nid *nid)
{
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
lpn = lnet_peer_get_net_locked(lp, LNET_NID_NET(nid));
if (!lpn)
return NULL;
list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
if (nid_same(&lpni->lpni_nid, nid))
return lpni;
}
return NULL;
}
struct lnet_peer *
lnet_find_peer(struct lnet_nid *nid)
{
struct lnet_peer_ni *lpni;
struct lnet_peer *lp = NULL;
int cpt;
cpt = lnet_net_lock_current();
lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_addref_locked(lp);
lnet_peer_ni_decref_locked(lpni);
}
lnet_net_unlock(cpt);
return lp;
}
struct lnet_peer_net *
lnet_get_next_peer_net_locked(struct lnet_peer *lp, __u32 prev_lpn_id)
{
struct lnet_peer_net *net;
if (!prev_lpn_id) {
/* no net id provided return the first net */
net = list_first_entry_or_null(&lp->lp_peer_nets,
struct lnet_peer_net,
lpn_peer_nets);
return net;
}
/* find the net after the one provided */
list_for_each_entry(net, &lp->lp_peer_nets, lpn_peer_nets) {
if (net->lpn_net_id == prev_lpn_id) {
/*
* if we reached the end of the list loop to the
* beginning.
*/
if (net->lpn_peer_nets.next == &lp->lp_peer_nets)
return list_first_entry_or_null(&lp->lp_peer_nets,
struct lnet_peer_net,
lpn_peer_nets);
else
return list_next_entry(net, lpn_peer_nets);
}
}
return NULL;
}
struct lnet_peer_ni *
lnet_get_next_peer_ni_locked(struct lnet_peer *peer,
struct lnet_peer_net *peer_net,
struct lnet_peer_ni *prev)
{
struct lnet_peer_ni *lpni;
struct lnet_peer_net *net = peer_net;
if (!prev) {
if (!net) {
if (list_empty(&peer->lp_peer_nets))
return NULL;
net = list_first_entry(&peer->lp_peer_nets,
struct lnet_peer_net,
lpn_peer_nets);
}
lpni = list_first_entry(&net->lpn_peer_nis, struct lnet_peer_ni,
lpni_peer_nis);
return lpni;
}
if (prev->lpni_peer_nis.next == &prev->lpni_peer_net->lpn_peer_nis) {
/*
* if you reached the end of the peer ni list and the peer
* net is specified then there are no more peer nis in that
* net.
*/
if (net)
return NULL;
/*
* we reached the end of this net ni list. move to the
* next net
*/
if (prev->lpni_peer_net->lpn_peer_nets.next ==
&peer->lp_peer_nets)
/* no more nets and no more NIs. */
return NULL;
/* get the next net */
net = list_first_entry(&prev->lpni_peer_net->lpn_peer_nets,
struct lnet_peer_net,
lpn_peer_nets);
/* get the ni on it */
lpni = list_first_entry(&net->lpn_peer_nis, struct lnet_peer_ni,
lpni_peer_nis);
return lpni;
}
/* there are more nis left */
lpni = list_first_entry(&prev->lpni_peer_nis,
struct lnet_peer_ni, lpni_peer_nis);
return lpni;
}
/* Call with the ln_api_mutex held */
int lnet_get_peer_list(u32 *countp, u32 *sizep, struct lnet_process_id __user *ids)
{
struct lnet_process_id id;
struct lnet_peer_table *ptable;
struct lnet_peer *lp;
__u32 count = 0;
__u32 size = 0;
int lncpt;
int cpt;
__u32 i;
int rc;
rc = -ESHUTDOWN;
if (the_lnet.ln_state != LNET_STATE_RUNNING)
goto done;
lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
/*
* Count the number of peers, and return E2BIG if the buffer
* is too small. We'll also return the desired size.
*/
rc = -E2BIG;
for (cpt = 0; cpt < lncpt; cpt++) {
ptable = the_lnet.ln_peer_tables[cpt];
count += ptable->pt_peers;
}
size = count * sizeof(*ids);
if (size > *sizep)
goto done;
/*
* Walk the peer lists and copy out the primary nids.
* This is safe because the peer lists are only modified
* while the ln_api_mutex is held. So we don't need to
* hold the lnet_net_lock as well, and can therefore
* directly call copy_to_user().
*/
rc = -EFAULT;
memset(&id, 0, sizeof(id));
id.pid = LNET_PID_LUSTRE;
i = 0;
for (cpt = 0; cpt < lncpt; cpt++) {
ptable = the_lnet.ln_peer_tables[cpt];
list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
if (!nid_is_nid4(&lp->lp_primary_nid))
continue;
if (i >= count)
goto done;
id.nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
if (copy_to_user(&ids[i], &id, sizeof(id)))
goto done;
i++;
}
}
rc = 0;
done:
*countp = count;
*sizep = size;
return rc;
}
/*
* Start pushes to peers that need to be updated for a configuration
* change on this node.
*/
void
lnet_push_update_to_peers(int force)
{
struct lnet_peer_table *ptable;
struct lnet_peer *lp;
int lncpt;
int cpt;
if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
return;
lnet_net_lock(LNET_LOCK_EX);
if (lnet_peer_discovery_disabled)
force = 0;
lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
for (cpt = 0; cpt < lncpt; cpt++) {
ptable = the_lnet.ln_peer_tables[cpt];
list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
if (force) {
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_MULTI_RAIL)
lp->lp_state |= LNET_PEER_FORCE_PUSH;
spin_unlock(&lp->lp_lock);
}
if (lnet_peer_needs_push(lp))
lnet_peer_queue_for_discovery(lp);
}
}
lnet_net_unlock(LNET_LOCK_EX);
wake_up(&the_lnet.ln_dc_waitq);
}
/* find the NID in the preferred gateways for the remote peer
* return:
* false: list is not empty and NID is not preferred
* false: list is empty
* true: nid is found in the list
*/
bool
lnet_peer_is_pref_rtr_locked(struct lnet_peer_ni *lpni,
struct lnet_nid *gw_nid)
{
struct lnet_nid_list *ne;
CDEBUG(D_NET, "%s: rtr pref emtpy: %d\n",
libcfs_nidstr(&lpni->lpni_nid),
list_empty(&lpni->lpni_rtr_pref_nids));
if (list_empty(&lpni->lpni_rtr_pref_nids))
return false;
/* iterate through all the preferred NIDs and see if any of them
* matches the provided gw_nid
*/
list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
CDEBUG(D_NET, "Comparing pref %s with gw %s\n",
libcfs_nidstr(&ne->nl_nid),
libcfs_nidstr(gw_nid));
if (nid_same(&ne->nl_nid, gw_nid))
return true;
}
return false;
}
void
lnet_peer_clr_pref_rtrs(struct lnet_peer_ni *lpni)
{
struct list_head zombies;
struct lnet_nid_list *ne;
struct lnet_nid_list *tmp;
int cpt = lpni->lpni_cpt;
INIT_LIST_HEAD(&zombies);
lnet_net_lock(cpt);
list_splice_init(&lpni->lpni_rtr_pref_nids, &zombies);
lnet_net_unlock(cpt);
list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
list_del(&ne->nl_list);
LIBCFS_FREE(ne, sizeof(*ne));
}
}
int
lnet_peer_add_pref_rtr(struct lnet_peer_ni *lpni,
struct lnet_nid *gw_nid)
{
int cpt = lpni->lpni_cpt;
struct lnet_nid_list *ne = NULL;
/* This function is called with api_mutex held. When the api_mutex
* is held the list can not be modified, as it is only modified as
* a result of applying a UDSP and that happens under api_mutex
* lock.
*/
__must_hold(&the_lnet.ln_api_mutex);
list_for_each_entry(ne, &lpni->lpni_rtr_pref_nids, nl_list) {
if (nid_same(&ne->nl_nid, gw_nid))
return -EEXIST;
}
LIBCFS_CPT_ALLOC(ne, lnet_cpt_table(), cpt, sizeof(*ne));
if (!ne)
return -ENOMEM;
ne->nl_nid = *gw_nid;
/* Lock the cpt to protect against addition and checks in the
* selection algorithm
*/
lnet_net_lock(cpt);
list_add(&ne->nl_list, &lpni->lpni_rtr_pref_nids);
lnet_net_unlock(cpt);
return 0;
}
/*
* Test whether a ni is a preferred ni for this peer_ni, e.g, whether
* this is a preferred point-to-point path. Call with lnet_net_lock in
* shared mmode.
*/
bool
lnet_peer_is_pref_nid_locked(struct lnet_peer_ni *lpni, struct lnet_nid *nid)
{
struct lnet_nid_list *ne;
if (lpni->lpni_pref_nnids == 0)
return false;
if (lpni->lpni_pref_nnids == 1)
return nid_same(&lpni->lpni_pref.nid, nid);
list_for_each_entry(ne, &lpni->lpni_pref.nids, nl_list) {
if (nid_same(&ne->nl_nid, nid))
return true;
}
return false;
}
/*
* Set a single ni as preferred, provided no preferred ni is already
* defined. Only to be used for non-multi-rail peer_ni.
*/
int
lnet_peer_ni_set_non_mr_pref_nid(struct lnet_peer_ni *lpni,
struct lnet_nid *nid)
{
int rc = 0;
if (!nid)
return -EINVAL;
spin_lock(&lpni->lpni_lock);
if (LNET_NID_IS_ANY(nid)) {
rc = -EINVAL;
} else if (lpni->lpni_pref_nnids > 0) {
rc = -EPERM;
} else if (lpni->lpni_pref_nnids == 0) {
lpni->lpni_pref.nid = *nid;
lpni->lpni_pref_nnids = 1;
lpni->lpni_state |= LNET_PEER_NI_NON_MR_PREF;
}
spin_unlock(&lpni->lpni_lock);
CDEBUG(D_NET, "peer %s nid %s: %d\n",
libcfs_nidstr(&lpni->lpni_nid), libcfs_nidstr(nid), rc);
return rc;
}
/*
* Clear the preferred NID from a non-multi-rail peer_ni, provided
* this preference was set by lnet_peer_ni_set_non_mr_pref_nid().
*/
static int
lnet_peer_ni_clr_non_mr_pref_nid(struct lnet_peer_ni *lpni)
{
int rc = 0;
spin_lock(&lpni->lpni_lock);
if (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF) {
lpni->lpni_pref_nnids = 0;
lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
} else if (lpni->lpni_pref_nnids == 0) {
rc = -ENOENT;
} else {
rc = -EPERM;
}
spin_unlock(&lpni->lpni_lock);
CDEBUG(D_NET, "peer %s: %d\n",
libcfs_nidstr(&lpni->lpni_nid), rc);
return rc;
}
void
lnet_peer_ni_set_selection_priority(struct lnet_peer_ni *lpni, __u32 priority)
{
lpni->lpni_sel_priority = priority;
}
/*
* Clear the preferred NIDs from a non-multi-rail peer.
*/
static void
lnet_peer_clr_non_mr_pref_nids(struct lnet_peer *lp)
{
struct lnet_peer_ni *lpni = NULL;
while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
lnet_peer_ni_clr_non_mr_pref_nid(lpni);
}
int
lnet_peer_add_pref_nid(struct lnet_peer_ni *lpni, struct lnet_nid *nid)
{
struct lnet_peer *lp = lpni->lpni_peer_net->lpn_peer;
struct lnet_nid_list *ne1 = NULL;
struct lnet_nid_list *ne2 = NULL;
struct lnet_nid *tmp_nid = NULL;
int rc = 0;
if (LNET_NID_IS_ANY(nid)) {
rc = -EINVAL;
goto out;
}
if (lpni->lpni_pref_nnids == 1 &&
nid_same(&lpni->lpni_pref.nid, nid)) {
rc = -EEXIST;
goto out;
}
/* A non-MR node may have only one preferred NI per peer_ni */
if (lpni->lpni_pref_nnids > 0 &&
!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
rc = -EPERM;
goto out;
}
/* add the new preferred nid to the list of preferred nids */
if (lpni->lpni_pref_nnids != 0) {
size_t alloc_size = sizeof(*ne1);
if (lpni->lpni_pref_nnids == 1) {
tmp_nid = &lpni->lpni_pref.nid;
INIT_LIST_HEAD(&lpni->lpni_pref.nids);
}
list_for_each_entry(ne1, &lpni->lpni_pref.nids, nl_list) {
if (nid_same(&ne1->nl_nid, nid)) {
rc = -EEXIST;
goto out;
}
}
LIBCFS_CPT_ALLOC(ne1, lnet_cpt_table(), lpni->lpni_cpt,
alloc_size);
if (!ne1) {
rc = -ENOMEM;
goto out;
}
/* move the originally stored nid to the list */
if (lpni->lpni_pref_nnids == 1) {
LIBCFS_CPT_ALLOC(ne2, lnet_cpt_table(),
lpni->lpni_cpt, alloc_size);
if (!ne2) {
rc = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&ne2->nl_list);
ne2->nl_nid = *tmp_nid;
}
ne1->nl_nid = *nid;
}
lnet_net_lock(LNET_LOCK_EX);
spin_lock(&lpni->lpni_lock);
if (lpni->lpni_pref_nnids == 0) {
lpni->lpni_pref.nid = *nid;
} else {
if (ne2)
list_add_tail(&ne2->nl_list, &lpni->lpni_pref.nids);
list_add_tail(&ne1->nl_list, &lpni->lpni_pref.nids);
}
lpni->lpni_pref_nnids++;
lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
spin_unlock(&lpni->lpni_lock);
lnet_net_unlock(LNET_LOCK_EX);
out:
if (rc == -EEXIST && (lpni->lpni_state & LNET_PEER_NI_NON_MR_PREF)) {
spin_lock(&lpni->lpni_lock);
lpni->lpni_state &= ~LNET_PEER_NI_NON_MR_PREF;
spin_unlock(&lpni->lpni_lock);
}
CDEBUG(D_NET, "peer %s nid %s: %d\n",
libcfs_nidstr(&lp->lp_primary_nid), libcfs_nidstr(nid), rc);
return rc;
}
void
lnet_peer_clr_pref_nids(struct lnet_peer_ni *lpni)
{
struct list_head zombies;
struct lnet_nid_list *ne;
struct lnet_nid_list *tmp;
INIT_LIST_HEAD(&zombies);
lnet_net_lock(LNET_LOCK_EX);
if (lpni->lpni_pref_nnids == 1)
lpni->lpni_pref.nid = LNET_ANY_NID;
else if (lpni->lpni_pref_nnids > 1)
list_splice_init(&lpni->lpni_pref.nids, &zombies);
lpni->lpni_pref_nnids = 0;
lnet_net_unlock(LNET_LOCK_EX);
list_for_each_entry_safe(ne, tmp, &zombies, nl_list) {
list_del_init(&ne->nl_list);
LIBCFS_FREE(ne, sizeof(*ne));
}
}
void
lnet_peer_primary_nid_locked(struct lnet_nid *nid, struct lnet_nid *result)
{
struct lnet_peer_ni *lpni;
*result = *nid;
lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
*result = lpni->lpni_peer_net->lpn_peer->lp_primary_nid;
lnet_peer_ni_decref_locked(lpni);
}
}
bool
lnet_is_discovery_disabled_locked(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
if (lnet_peer_discovery_disabled)
return true;
if (!(lp->lp_state & LNET_PEER_MULTI_RAIL) ||
(lp->lp_state & LNET_PEER_NO_DISCOVERY)) {
return true;
}
return false;
}
/*
* Peer Discovery
*/
bool
lnet_is_discovery_disabled(struct lnet_peer *lp)
{
bool rc = false;
spin_lock(&lp->lp_lock);
rc = lnet_is_discovery_disabled_locked(lp);
spin_unlock(&lp->lp_lock);
return rc;
}
static void
lnet_discover_peer_nid(struct lnet_nid *nid)
{
int cpt = lnet_net_lock_current();
struct lnet_peer_ni *lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
lnet_discover_peer_locked(lpni, cpt, false);
lnet_peer_ni_decref_locked(lpni);
}
lnet_net_unlock(cpt);
}
void LNetAddPeer(struct lnet_nid *nids, int num_nids)
{
struct lnet_nid pnid = LNET_ANY_NID;
char nidstr[LNET_NIDSTR_SIZE] = { 0 };
bool discovery;
int i, rc;
int flags = lock_prim_nid ? LNET_PEER_LOCK_PRIMARY : 0;
if (!nids || num_nids < 1) {
CDEBUG(D_NET, "Invalid parameters: nids=%p, num_nids=%d\n",
nids, num_nids);
return;
}
CDEBUG(D_NET, "Add peer with %d NIDs\n", num_nids);
rc = LNetNIInit(LNET_PID_ANY);
if (rc < 0) {
CDEBUG(D_NET, "LNetNIInit failed, rc = %d\n", rc);
return;
}
mutex_lock(&the_lnet.ln_api_mutex);
discovery = !lnet_peer_discovery_disabled;
for (i = 0; i < num_nids; i++) {
libcfs_nidstr_r(&nids[i], nidstr, LNET_NIDSTR_SIZE);
CDEBUG(D_NET, "Adding NID[%i]: %s\n", i, nidstr);
if (nid_is_lo0(&nids[i])) {
CDEBUG(D_NET, "Skip NID %s as local\n", nidstr);
continue;
}
/* only add NIDs on local networks if discovery is off */
if (!discovery && !lnet_islocalnet(LNET_NID_NET(&nids[i]))) {
CDEBUG(D_NET, "Skip NID %s on missing network\n",
nidstr);
continue;
}
if (LNET_NID_IS_ANY(&pnid)) {
pnid = nids[i];
rc = lnet_add_peer_ni(&pnid, &LNET_ANY_NID, discovery,
flags);
if (rc == -EALREADY) {
struct lnet_peer *lp;
/* Adds a refcount */
lp = lnet_find_peer(&pnid);
LASSERT(lp);
pnid = lp->lp_primary_nid;
/* Drop refcount from lookup */
lnet_peer_decref_locked(lp);
} else if (rc && rc != -EEXIST) {
/* reset pnid back to ANY if error */
pnid = LNET_ANY_NID;
} else if (discovery) {
lnet_discover_peer_nid(&pnid);
}
} else if (!discovery) {
rc = lnet_add_peer_ni(&nids[i], &LNET_ANY_NID, false,
flags);
} else if (!nid_same(&pnid, &nids[i])) {
rc = lnet_add_peer_ni(&nids[i], &LNET_ANY_NID, true, 0);
if (!rc) {
if (lock_prim_nid) {
struct lnet_peer *lp;
lp = lnet_find_peer(&nids[i]);
if (lp) {
lp->lp_merge_primary_nid = pnid;
lnet_peer_decref_locked(lp);
}
}
lnet_discover_peer_nid(&nids[i]);
}
}
if (rc == -EEXIST || rc == -EALREADY)
CDEBUG(D_NET, "A peer exists for NID %s\n", nidstr);
else if (rc)
CDEBUG(D_NET, "Fail to add peer NID %s, rc = %d\n",
nidstr, rc);
}
mutex_unlock(&the_lnet.ln_api_mutex);
LNetNIFini();
}
EXPORT_SYMBOL(LNetAddPeer);
int LNetHasLocalNet(__u32 net)
{
if (net == LNET_NET_ANY)
return false;
return lnet_islocalnet(net);
}
EXPORT_SYMBOL(LNetHasLocalNet);
/* TODO @timday: There should be a better way? */
void LNetLocalPrimaryNID(struct lnet_nid *nid)
{
struct lnet_net *net;
struct lnet_ni *ni;
int cpt;
/* Find a local NID to give LNetPrimaryNID */
cpt = lnet_net_lock_current();
list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
if (!nid_is_lo0(&ni->ni_nid)) {
*nid = ni->ni_nid;
goto out;
}
}
}
out:
lnet_net_unlock(cpt);
LNetPrimaryNID(nid);
}
EXPORT_SYMBOL(LNetLocalPrimaryNID);
void LNetPrimaryNID(struct lnet_nid *nid)
{
struct lnet_peer *lp;
struct lnet_peer_ni *lpni;
struct lnet_nid orig;
int rc = 0;
int cpt;
if (!nid || nid_is_lo0(nid))
return;
orig = *nid;
cpt = lnet_net_lock_current();
lpni = lnet_peerni_by_nid_locked(nid, NULL, cpt);
if (IS_ERR(lpni)) {
rc = PTR_ERR(lpni);
goto out_unlock;
}
lp = lpni->lpni_peer_net->lpn_peer;
/* If discovery is disabled locally then we needn't bother running
* discovery here because discovery will not modify whatever
* primary NID is currently set for this peer. If the specified peer is
* down then this discovery can introduce long delays into the mount
* process, so skip it if it isn't necessary.
*/
again:
spin_lock(&lp->lp_lock);
/* DD disabled, nothing to do */
if (lnet_peer_discovery_disabled) {
*nid = lp->lp_primary_nid;
spin_unlock(&lp->lp_lock);
goto out_decref;
}
/* Peer already up to date, nothing to do */
if (lnet_peer_is_uptodate_locked(lp)) {
*nid = lp->lp_primary_nid;
spin_unlock(&lp->lp_lock);
goto out_decref;
}
spin_unlock(&lp->lp_lock);
/* If primary nid locking is enabled, discovery is performed
* in the background.
* If primary nid locking is disabled, discovery blocks here.
* Messages to the peer will not go through until the discovery is
* complete.
*/
if (lock_prim_nid && lp->lp_state & LNET_PEER_LOCK_PRIMARY)
rc = lnet_discover_peer_locked(lpni, cpt, false);
else
rc = lnet_discover_peer_locked(lpni, cpt, true);
if (rc)
goto out_decref;
/* The lpni (or lp) for this NID may have changed and our ref is
* the only thing keeping the old one around. Release the ref
* and lookup the lpni again
*/
lnet_peer_ni_decref_locked(lpni);
lpni = lnet_peer_ni_find_locked(nid);
if (!lpni) {
rc = -ENOENT;
goto out_unlock;
}
lp = lpni->lpni_peer_net->lpn_peer;
if (!lock_prim_nid && !lnet_is_discovery_disabled(lp))
goto again;
*nid = lp->lp_primary_nid;
out_decref:
lnet_peer_ni_decref_locked(lpni);
out_unlock:
lnet_net_unlock(cpt);
CDEBUG(D_NET, "NID %s primary NID %s rc %d\n", libcfs_nidstr(&orig),
libcfs_nidstr(nid), rc);
}
EXPORT_SYMBOL(LNetPrimaryNID);
int LNetPeerDiscovered(struct lnet_nid *nid)
{
struct lnet_peer_ni *lpni;
struct lnet_peer *lp = NULL;
int cpt;
int rc;
if (nid_is_lo0(nid))
return 1;
cpt = lnet_net_lock_current();
lpni = lnet_peerni_by_nid_locked(nid, NULL, cpt);
if (IS_ERR(lpni)) {
CDEBUG(D_NET, "No peer for NID %s, skip for now\n",
libcfs_nidstr(nid));
lnet_net_unlock(cpt);
return -ENETRESET;
}
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_addref_locked(lp);
lnet_peer_ni_decref_locked(lpni);
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_NO_DISCOVERY ||
(lp->lp_state & LNET_PEER_DISCOVERED &&
lp->lp_state & LNET_PEER_NIDS_UPTODATE))
rc = 1;
else if (lp->lp_state & LNET_PEER_PING_FAILED)
rc = -EHOSTUNREACH;
else if (lp->lp_state & LNET_PEER_DISCOVERING)
rc = -EALREADY;
else
rc = -EAGAIN;
spin_unlock(&lp->lp_lock);
if (rc == -EAGAIN) {
lnet_net_unlock(cpt);
cpt = LNET_LOCK_EX;
lnet_net_lock(cpt);
lnet_peer_queue_for_discovery(lp);
}
/* Drop refcount from lookup */
lnet_peer_decref_locked(lp);
lnet_net_unlock(cpt);
CDEBUG(D_NET, "Peer NID %s is %sdiscovered: rc = %d\n",
libcfs_nidstr(nid), rc > 0 ? "" : "not ", rc);
return rc;
}
EXPORT_SYMBOL(LNetPeerDiscovered);
struct lnet_peer_net *
lnet_peer_get_net_locked(struct lnet_peer *peer, __u32 net_id)
{
struct lnet_peer_net *peer_net;
list_for_each_entry(peer_net, &peer->lp_peer_nets, lpn_peer_nets) {
if (peer_net->lpn_net_id == net_id)
return peer_net;
}
return NULL;
}
/*
* Attach a peer_ni to a peer_net and peer. This function assumes
* peer_ni is not already attached to the peer_net/peer. The peer_ni
* may be attached to a different peer, in which case it will be
* properly detached first. The whole operation is done atomically.
*
* This function consumes the reference on lpni and Always returns 0.
* This is the last function called from functions that do return an
* int, so returning 0 here allows the compiler to do a tail call.
*/
static int
lnet_peer_attach_peer_ni(struct lnet_peer *lp,
struct lnet_peer_net *lpn,
struct lnet_peer_ni *lpni,
unsigned flags)
{
struct lnet_peer_table *ptable;
bool new_lpn = false;
int rc;
/* Install the new peer_ni */
lnet_net_lock(LNET_LOCK_EX);
/* Add peer_ni to global peer table hash, if necessary. */
if (list_empty(&lpni->lpni_hashlist)) {
int hash = lnet_nid2peerhash(&lpni->lpni_nid);
ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
list_add_tail(&lpni->lpni_hashlist, &ptable->pt_hash[hash]);
ptable->pt_version++;
kref_get(&lpni->lpni_kref);
}
/* Detach the peer_ni from an existing peer, if necessary. */
if (lpni->lpni_peer_net) {
LASSERT(lpni->lpni_peer_net != lpn);
LASSERT(lpni->lpni_peer_net->lpn_peer != lp);
lnet_peer_detach_peer_ni_locked(lpni);
lnet_peer_net_decref_locked(lpni->lpni_peer_net);
lpni->lpni_peer_net = NULL;
}
/* Add peer_ni to peer_net */
lpni->lpni_peer_net = lpn;
if (nid_same(&lp->lp_primary_nid, &lpni->lpni_nid))
list_add(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
else
list_add_tail(&lpni->lpni_peer_nis, &lpn->lpn_peer_nis);
lnet_update_peer_net_healthv(lpni);
lnet_peer_net_addref_locked(lpn);
/* Add peer_net to peer */
if (!lpn->lpn_peer) {
new_lpn = true;
lpn->lpn_peer = lp;
if (nid_same(&lp->lp_primary_nid, &lpni->lpni_nid))
list_add(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
else
list_add_tail(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
lnet_peer_addref_locked(lp);
}
/* Add peer to global peer list, if necessary */
ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
if (list_empty(&lp->lp_peer_list)) {
list_add_tail(&lp->lp_peer_list, &ptable->pt_peer_list);
ptable->pt_peers++;
}
/* Update peer state */
spin_lock(&lp->lp_lock);
if (flags & LNET_PEER_CONFIGURED) {
if (!(lp->lp_state & LNET_PEER_CONFIGURED))
lp->lp_state |= LNET_PEER_CONFIGURED;
}
if (flags & LNET_PEER_MULTI_RAIL) {
if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
lp->lp_state |= LNET_PEER_MULTI_RAIL;
lnet_peer_clr_non_mr_pref_nids(lp);
}
}
if (flags & LNET_PEER_LOCK_PRIMARY) {
lp->lp_state |= LNET_PEER_LOCK_PRIMARY;
lp->lp_prim_lock_ts = ktime_get_ns();
}
spin_unlock(&lp->lp_lock);
lp->lp_nnis++;
/* apply UDSPs */
if (new_lpn) {
rc = lnet_udsp_apply_policies_on_lpn(lpn);
if (rc)
CERROR("Failed to apply UDSPs on lpn %s\n",
libcfs_net2str(lpn->lpn_net_id));
}
rc = lnet_udsp_apply_policies_on_lpni(lpni);
if (rc)
CERROR("Failed to apply UDSPs on lpni %s\n",
libcfs_nidstr(&lpni->lpni_nid));
CDEBUG(D_NET, "peer %s NID %s flags %#x\n",
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(&lpni->lpni_nid), flags);
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
return 0;
}
/*
* Create a new peer, with nid as its primary nid.
*
* Call with the lnet_api_mutex held.
*/
static int
lnet_peer_add(struct lnet_nid *nid, unsigned int flags)
{
struct lnet_peer *lp;
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
int rc = 0;
LASSERT(nid);
/*
* No need for the lnet_net_lock here, because the
* lnet_api_mutex is held.
*/
lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
/* A peer with this NID already exists. */
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_ni_decref_locked(lpni);
/*
* This is an error if the peer was configured and the
* primary NID differs or an attempt is made to change
* the Multi-Rail flag. Otherwise the assumption is
* that an existing peer is being modified.
*/
if (lp->lp_state & LNET_PEER_CONFIGURED) {
if (!nid_same(&lp->lp_primary_nid, nid))
rc = -EEXIST;
else if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL)
rc = -EPERM;
goto out;
} else if (lp->lp_state & LNET_PEER_LOCK_PRIMARY) {
if (nid_same(&lp->lp_primary_nid, nid))
rc = -EEXIST;
/* we're trying to recreate an existing peer which
* has already been created and its primary
* locked. This is likely due to two servers
* existing on the same node. So we'll just refer
* to that node with the primary NID which was
* first added by Lustre
*/
else
rc = -EALREADY;
goto out;
} else if (!(flags & (LNET_PEER_LOCK_PRIMARY | LNET_PEER_CONFIGURED))) {
/* if not recreating peer as configured and
* not locking primary nid, no need to
* do anything if primary nid is not being changed
*/
if (nid_same(&lp->lp_primary_nid, nid)) {
rc = -EEXIST;
goto out;
}
}
/* Delete and recreate the peer.
* We can get here:
* 1. If the peer is being recreated as a configured NID
* 2. if there already exists a peer which
* was discovered manually, but is recreated via Lustre
* with PRIMARY_lock
*/
rc = lnet_peer_del(lp);
if (rc)
goto out;
}
/* Create peer, peer_net, and peer_ni. */
rc = -ENOMEM;
lp = lnet_peer_alloc(nid);
if (!lp)
goto out;
lpn = lnet_peer_net_alloc(LNET_NID_NET(nid));
if (!lpn)
goto out_free_lp;
lpni = lnet_peer_ni_alloc(nid);
if (!lpni)
goto out_free_lpn;
return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
out_free_lpn:
LIBCFS_FREE(lpn, sizeof(*lpn));
out_free_lp:
LIBCFS_FREE(lp, sizeof(*lp));
out:
CDEBUG(D_NET, "peer %s NID flags %#x: %d\n",
libcfs_nidstr(nid), flags, rc);
return rc;
}
/*
* Add a NID to a peer. Call with ln_api_mutex held.
*
* Error codes:
* -EPERM: Non-DLC addition to a DLC-configured peer.
* -EEXIST: The NID was configured by DLC for a different peer.
* -ENOMEM: Out of memory.
* -ENOTUNIQ: Adding a second peer NID on a single network on a
* non-multi-rail peer.
*/
static int
lnet_peer_add_nid(struct lnet_peer *lp, struct lnet_nid *nid,
unsigned int flags)
{
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
int rc = 0;
LASSERT(lp);
LASSERT(nid);
/* A configured peer can only be updated through configuration. */
if (!(flags & LNET_PEER_CONFIGURED)) {
if (lp->lp_state & LNET_PEER_CONFIGURED) {
rc = -EPERM;
goto out;
}
}
/*
* The MULTI_RAIL flag can be set but not cleared, because
* that would leave the peer struct in an invalid state.
*/
if (flags & LNET_PEER_MULTI_RAIL) {
spin_lock(&lp->lp_lock);
if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
lp->lp_state |= LNET_PEER_MULTI_RAIL;
lnet_peer_clr_non_mr_pref_nids(lp);
}
spin_unlock(&lp->lp_lock);
} else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
rc = -EPERM;
goto out;
}
lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
/*
* A peer_ni already exists. This is only a problem if
* it is not connected to this peer and was configured
* by DLC.
*/
if (lpni->lpni_peer_net->lpn_peer == lp)
goto out_free_lpni;
if (lnet_peer_ni_is_configured(lpni)) {
rc = -EEXIST;
goto out_free_lpni;
}
/* If this is the primary NID, destroy the peer. */
if (lnet_peer_ni_is_primary(lpni)) {
struct lnet_peer *lp2 =
lpni->lpni_peer_net->lpn_peer;
int rtr_refcount = lp2->lp_rtr_refcount;
unsigned int peer2_state;
__u64 peer2_prim_lock_ts;
/* If there's another peer that this NID belongs to
* and the primary NID for that peer is locked,
* then, unless it is the only NID, we don't want
* to mess with it.
* But the configuration is wrong at this point,
* so we should flag both of these peers as in a bad
* state
*/
spin_lock(&lp2->lp_lock);
if (lp2->lp_state & LNET_PEER_LOCK_PRIMARY &&
lp2->lp_nnis > 1) {
lp2->lp_state |= LNET_PEER_BAD_CONFIG;
spin_unlock(&lp2->lp_lock);
spin_lock(&lp->lp_lock);
lp->lp_state |= LNET_PEER_BAD_CONFIG;
spin_unlock(&lp->lp_lock);
CERROR("Peer %s NID %s is already locked with peer %s\n",
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(nid),
libcfs_nidstr(&lp2->lp_primary_nid));
goto out_free_lpni;
}
peer2_state = lp2->lp_state;
peer2_prim_lock_ts = lp2->lp_prim_lock_ts;
spin_unlock(&lp2->lp_lock);
/* NID which got locked the earliest should be
* kept as primary. In case if the peers were
* created by Lustre, this allows the
* first listed NID to stay primary as intended
* for the purpose of communicating with Lustre
* even if peer discovery succeeded using
* a different NID of MR peer.
*/
spin_lock(&lp->lp_lock);
if (peer2_state & LNET_PEER_LOCK_PRIMARY &&
((lp->lp_state & LNET_PEER_LOCK_PRIMARY &&
peer2_prim_lock_ts < lp->lp_prim_lock_ts) ||
!(lp->lp_state & LNET_PEER_LOCK_PRIMARY))) {
lp->lp_prim_lock_ts = peer2_prim_lock_ts;
lp->lp_primary_nid = *nid;
lp->lp_state |= LNET_PEER_LOCK_PRIMARY;
}
spin_unlock(&lp->lp_lock);
/*
* if we're trying to delete a router it means
* we're moving this peer NI to a new peer so must
* transfer router properties to the new peer
*/
if (rtr_refcount > 0) {
flags |= LNET_PEER_RTR_NI_FORCE_DEL;
lnet_rtr_transfer_to_peer(lp2, lp);
}
lnet_peer_del(lp2);
lnet_peer_ni_decref_locked(lpni);
lpni = lnet_peer_ni_alloc(nid);
if (!lpni) {
rc = -ENOMEM;
goto out_free_lpni;
}
}
} else {
lpni = lnet_peer_ni_alloc(nid);
if (!lpni) {
rc = -ENOMEM;
goto out_free_lpni;
}
}
/*
* Get the peer_net. Check that we're not adding a second
* peer_ni on a peer_net of a non-multi-rail peer.
*/
lpn = lnet_peer_get_net_locked(lp, LNET_NID_NET(nid));
if (!lpn) {
lpn = lnet_peer_net_alloc(LNET_NID_NET(nid));
if (!lpn) {
rc = -ENOMEM;
goto out_free_lpni;
}
} else if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
rc = -ENOTUNIQ;
goto out_free_lpni;
}
return lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
out_free_lpni:
lnet_peer_ni_decref_locked(lpni);
out:
CDEBUG(D_NET, "peer %s NID %s flags %#x: %d\n",
libcfs_nidstr(&lp->lp_primary_nid), libcfs_nidstr(nid),
flags, rc);
return rc;
}
/*
* Update the primary NID of a peer, if possible.
*
* Call with the lnet_api_mutex held.
*/
static int
lnet_peer_set_primary_nid(struct lnet_peer *lp, struct lnet_nid *nid,
unsigned int flags)
{
struct lnet_nid old = lp->lp_primary_nid;
int rc = 0;
if (nid_same(&lp->lp_primary_nid, nid))
goto out;
if (!(lp->lp_state & LNET_PEER_LOCK_PRIMARY))
lp->lp_primary_nid = *nid;
rc = lnet_peer_add_nid(lp, nid, flags);
if (rc) {
lp->lp_primary_nid = old;
goto out;
}
out:
/* if this is a configured peer or the primary for that peer has
* been locked, then we don't want to flag this scenario as
* a failure
*/
if (lp->lp_state & LNET_PEER_CONFIGURED ||
lp->lp_state & LNET_PEER_LOCK_PRIMARY)
return 0;
CDEBUG(D_NET, "peer %s NID %s: %d\n",
libcfs_nidstr(&old), libcfs_nidstr(nid), rc);
return rc;
}
/*
* lpni creation initiated due to traffic either sending or receiving.
* Callers must hold ln_api_mutex
* Ref taken on lnet_peer_ni returned by this function
*/
static struct lnet_peer_ni *
lnet_peer_ni_traffic_add(struct lnet_nid *nid, struct lnet_nid *pref)
__must_hold(&the_lnet.ln_api_mutex)
{
struct lnet_peer *lp = NULL;
struct lnet_peer_net *lpn = NULL;
struct lnet_peer_ni *lpni;
unsigned flags = 0;
int rc = 0;
if (LNET_NID_IS_ANY(nid)) {
rc = -EINVAL;
goto out_err;
}
/* lnet_net_lock is not needed here because ln_api_lock is held */
lpni = lnet_peer_ni_find_locked(nid);
if (lpni) {
/*
* We must have raced with another thread. Since we
* know next to nothing about a peer_ni created by
* traffic, we just assume everything is ok and
* return.
*/
goto out;
}
/* Create peer, peer_net, and peer_ni. */
rc = -ENOMEM;
lp = lnet_peer_alloc(nid);
if (!lp)
goto out_err;
lpn = lnet_peer_net_alloc(LNET_NID_NET(nid));
if (!lpn)
goto out_err;
lpni = lnet_peer_ni_alloc(nid);
if (!lpni)
goto out_err;
lnet_peer_ni_set_non_mr_pref_nid(lpni, pref);
/* lnet_peer_attach_peer_ni() always returns 0 */
rc = lnet_peer_attach_peer_ni(lp, lpn, lpni, flags);
kref_get(&lpni->lpni_kref);
out_err:
if (rc) {
LIBCFS_FREE(lpn, sizeof(*lpn));
LIBCFS_FREE(lp, sizeof(*lp));
lpni = ERR_PTR(rc);
}
out:
CDEBUG(D_NET, "peer %s: %d\n", libcfs_nidstr(nid), rc);
return lpni;
}
/*
* Implementation of IOC_LIBCFS_ADD_PEER_NI.
*
* This API handles the following combinations:
* Create a peer with its primary NI if only the prim_nid is provided
* Add a NID to a peer identified by the prim_nid. The peer identified
* by the prim_nid must already exist.
* The peer being created may be non-MR.
*
* The caller must hold ln_api_mutex. This prevents the peer from
* being created/modified/deleted by a different thread.
*/
static int
lnet_add_peer_ni(struct lnet_nid *prim_nid, struct lnet_nid *nid, bool mr,
unsigned int flags)
__must_hold(&the_lnet.ln_api_mutex)
{
struct lnet_peer *lp = NULL;
struct lnet_peer_ni *lpni;
/* The prim_nid must always be specified */
if (LNET_NID_IS_ANY(prim_nid))
return -EINVAL;
if (mr)
flags |= LNET_PEER_MULTI_RAIL;
/*
* If nid isn't specified, we must create a new peer with
* prim_nid as its primary nid.
*/
if (LNET_NID_IS_ANY(nid))
return lnet_peer_add(prim_nid, flags);
/* Look up the prim_nid, which must exist. */
lpni = lnet_peer_ni_find_locked(prim_nid);
if (!lpni)
return -ENOENT;
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_ni_decref_locked(lpni);
/* Peer must have been configured. */
if ((flags & LNET_PEER_CONFIGURED) &&
!(lp->lp_state & LNET_PEER_CONFIGURED)) {
CDEBUG(D_NET, "peer %s was not configured\n",
libcfs_nidstr(prim_nid));
return -ENOENT;
}
/* Primary NID must match */
if (!nid_same(&lp->lp_primary_nid, prim_nid)) {
CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
libcfs_nidstr(prim_nid),
libcfs_nidstr(&lp->lp_primary_nid));
return -ENODEV;
}
/* Multi-Rail flag must match. */
if ((lp->lp_state ^ flags) & LNET_PEER_MULTI_RAIL) {
CDEBUG(D_NET, "multi-rail state mismatch for peer %s\n",
libcfs_nidstr(prim_nid));
return -EPERM;
}
if (lnet_peer_is_uptodate(lp) && !(flags & LNET_PEER_CONFIGURED)) {
CDEBUG(D_NET,
"Don't add temporary peer NI for uptodate peer %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
return -EINVAL;
}
return lnet_peer_add_nid(lp, nid, flags);
}
int lnet_user_add_peer_ni(struct lnet_nid *prim_nid, struct lnet_nid *nid,
bool mr, bool lock_prim)
{
int fl = LNET_PEER_CONFIGURED | (LNET_PEER_LOCK_PRIMARY * lock_prim);
return lnet_add_peer_ni(prim_nid, nid, mr, fl);
}
static int
lnet_reset_peer(struct lnet_peer *lp)
{
struct lnet_peer_net *lpn, *lpntmp;
struct lnet_peer_ni *lpni, *lpnitmp;
unsigned int flags;
int rc;
lnet_peer_cancel_discovery(lp);
flags = LNET_PEER_CONFIGURED;
if (lp->lp_state & LNET_PEER_MULTI_RAIL)
flags |= LNET_PEER_MULTI_RAIL;
list_for_each_entry_safe(lpn, lpntmp, &lp->lp_peer_nets, lpn_peer_nets) {
list_for_each_entry_safe(lpni, lpnitmp, &lpn->lpn_peer_nis,
lpni_peer_nis) {
if (nid_same(&lpni->lpni_nid, &lp->lp_primary_nid))
continue;
rc = lnet_peer_del_nid(lp, &lpni->lpni_nid, flags);
if (rc) {
CERROR("Failed to delete %s from peer %s\n",
libcfs_nidstr(&lpni->lpni_nid),
libcfs_nidstr(&lp->lp_primary_nid));
}
}
}
/* mark it for discovery the next time we use it */
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
return 0;
}
/*
* Implementation of IOC_LIBCFS_DEL_PEER_NI.
*
* This API handles the following combinations:
* Delete a NI from a peer if both prim_nid and nid are provided.
* Delete a peer if only prim_nid is provided.
* Delete a peer if its primary nid is provided.
*
* The caller must hold ln_api_mutex. This prevents the peer from
* being modified/deleted by a different thread.
*/
int
lnet_del_peer_ni(struct lnet_nid *prim_nid, struct lnet_nid *nid,
int force)
{
struct lnet_peer *lp;
struct lnet_peer_ni *lpni;
unsigned int flags;
if (!prim_nid || LNET_NID_IS_ANY(prim_nid))
return -EINVAL;
lpni = lnet_peer_ni_find_locked(prim_nid);
if (!lpni)
return -ENOENT;
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_ni_decref_locked(lpni);
if (!nid_same(prim_nid, &lp->lp_primary_nid)) {
CDEBUG(D_NET, "prim_nid %s is not primary for peer %s\n",
libcfs_nidstr(prim_nid),
libcfs_nidstr(&lp->lp_primary_nid));
return -ENODEV;
}
lnet_net_lock(LNET_LOCK_EX);
if (lp->lp_rtr_refcount > 0) {
lnet_net_unlock(LNET_LOCK_EX);
CERROR("%s is a router. Can not be deleted\n",
libcfs_nidstr(prim_nid));
return -EBUSY;
}
lnet_net_unlock(LNET_LOCK_EX);
if (LNET_NID_IS_ANY(nid) || nid_same(nid, &lp->lp_primary_nid)) {
if (!force && lp->lp_state & LNET_PEER_LOCK_PRIMARY) {
CERROR("peer %s created by Lustre. Must preserve primary NID, but will remove other NIDs\n",
libcfs_nidstr(&lp->lp_primary_nid));
return lnet_reset_peer(lp);
} else {
return lnet_peer_del(lp);
}
}
flags = LNET_PEER_CONFIGURED;
if (lp->lp_state & LNET_PEER_MULTI_RAIL)
flags |= LNET_PEER_MULTI_RAIL;
return lnet_peer_del_nid(lp, nid, flags);
}
void
lnet_destroy_peer_ni_locked(struct kref *ref)
{
struct lnet_peer_ni *lpni = container_of(ref, struct lnet_peer_ni,
lpni_kref);
struct lnet_peer_table *ptable;
struct lnet_peer_net *lpn;
CDEBUG(D_NET, "%p nid %s\n", lpni, libcfs_nidstr(&lpni->lpni_nid));
LASSERT(kref_read(&lpni->lpni_kref) == 0);
LASSERT(list_empty(&lpni->lpni_txq));
LASSERT(lpni->lpni_txqnob == 0);
LASSERT(list_empty(&lpni->lpni_peer_nis));
LASSERT(list_empty(&lpni->lpni_on_remote_peer_ni_list));
lpn = lpni->lpni_peer_net;
lpni->lpni_peer_net = NULL;
lpni->lpni_net = NULL;
if (!list_empty(&lpni->lpni_hashlist)) {
/* remove the peer ni from the zombie list */
ptable = the_lnet.ln_peer_tables[lpni->lpni_cpt];
spin_lock(&ptable->pt_zombie_lock);
list_del_init(&lpni->lpni_hashlist);
ptable->pt_zombies--;
spin_unlock(&ptable->pt_zombie_lock);
}
if (lpni->lpni_pref_nnids > 1) {
struct lnet_nid_list *ne, *tmp;
list_for_each_entry_safe(ne, tmp, &lpni->lpni_pref.nids,
nl_list) {
list_del_init(&ne->nl_list);
LIBCFS_FREE(ne, sizeof(*ne));
}
}
LIBCFS_FREE(lpni, sizeof(*lpni));
if (lpn)
lnet_peer_net_decref_locked(lpn);
}
struct lnet_peer_ni *
lnet_nid2peerni_ex(struct lnet_nid *nid)
__must_hold(&the_lnet.ln_api_mutex)
{
struct lnet_peer_ni *lpni = NULL;
if (the_lnet.ln_state != LNET_STATE_RUNNING)
return ERR_PTR(-ESHUTDOWN);
/*
* find if a peer_ni already exists.
* If so then just return that.
*/
lpni = lnet_peer_ni_find_locked(nid);
if (lpni)
return lpni;
lnet_net_unlock(LNET_LOCK_EX);
lpni = lnet_peer_ni_traffic_add(nid, NULL);
lnet_net_lock(LNET_LOCK_EX);
return lpni;
}
/*
* Get a peer_ni for the given nid, create it if necessary. Takes a
* hold on the peer_ni.
*/
struct lnet_peer_ni *
lnet_peerni_by_nid_locked(struct lnet_nid *nid,
struct lnet_nid *pref, int cpt)
{
struct lnet_peer_ni *lpni = NULL;
if (the_lnet.ln_state != LNET_STATE_RUNNING)
return ERR_PTR(-ESHUTDOWN);
/*
* find if a peer_ni already exists.
* If so then just return that.
*/
lpni = lnet_peer_ni_find_locked(nid);
if (lpni)
return lpni;
/*
* Slow path:
* use the lnet_api_mutex to serialize the creation of the peer_ni
* and the creation/deletion of the local ni/net. When a local ni is
* created, if there exists a set of peer_nis on that network,
* they need to be traversed and updated. When a local NI is
* deleted, which could result in a network being deleted, then
* all peer nis on that network need to be removed as well.
*
* Creation through traffic should also be serialized with
* creation through DLC.
*/
lnet_net_unlock(cpt);
mutex_lock(&the_lnet.ln_api_mutex);
/*
* the_lnet.ln_state is only modified under the ln_api_lock, so a single
* check here is sufficent.
*/
if (the_lnet.ln_state == LNET_STATE_RUNNING)
lpni = lnet_peer_ni_traffic_add(nid, pref);
mutex_unlock(&the_lnet.ln_api_mutex);
lnet_net_lock(cpt);
/* Lock has been dropped, check again for shutdown. */
if (the_lnet.ln_state != LNET_STATE_RUNNING) {
if (!IS_ERR_OR_NULL(lpni))
lnet_peer_ni_decref_locked(lpni);
lpni = ERR_PTR(-ESHUTDOWN);
}
return lpni;
}
bool
lnet_peer_gw_discovery(struct lnet_peer *lp)
{
bool rc = false;
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_RTR_DISCOVERY)
rc = true;
spin_unlock(&lp->lp_lock);
return rc;
}
bool
lnet_peer_is_uptodate(struct lnet_peer *lp)
{
bool rc;
spin_lock(&lp->lp_lock);
rc = lnet_peer_is_uptodate_locked(lp);
spin_unlock(&lp->lp_lock);
return rc;
}
/*
* Is a peer uptodate from the point of view of discovery?
*
* If it is currently being processed, obviously not.
* A forced Ping or Push is also handled by the discovery thread.
*
* Otherwise look at whether the peer needs rediscovering.
*/
bool
lnet_peer_is_uptodate_locked(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
bool rc;
if (lp->lp_state & (LNET_PEER_DISCOVERING |
LNET_PEER_FORCE_PING |
LNET_PEER_FORCE_PUSH)) {
rc = false;
} else if (lp->lp_state & LNET_PEER_REDISCOVER) {
rc = false;
} else if (lnet_peer_needs_push(lp)) {
rc = false;
} else if (lp->lp_state & LNET_PEER_DISCOVERED) {
if (lp->lp_state & LNET_PEER_NIDS_UPTODATE)
rc = true;
else
rc = false;
} else {
rc = false;
}
return rc;
}
/* Add the message to the peer's lp_dc_pendq and queue the peer for discovery */
void
lnet_peer_queue_message(struct lnet_peer *lp, struct lnet_msg *msg)
{
/* The discovery thread holds net_lock/EX and lp_lock when it splices
* the lp_dc_pendq onto a local list for resending. Thus, we do the same
* when adding to the list and queuing the peer to ensure that we do not
* strand any messages on the lp_dc_pendq. This scheme ensures the
* message will be resent even if the peer is already being discovered.
* Therefore we needn't check the return value of
* lnet_peer_queue_for_discovery(lp).
*/
lnet_net_lock(LNET_LOCK_EX);
spin_lock(&lp->lp_lock);
list_add_tail(&msg->msg_list, &lp->lp_dc_pendq);
spin_unlock(&lp->lp_lock);
lnet_peer_queue_for_discovery(lp);
lnet_net_unlock(LNET_LOCK_EX);
}
/*
* Queue a peer for the attention of the discovery thread. Call with
* lnet_net_lock/EX held. Returns 0 if the peer was queued, and
* -EALREADY if the peer was already queued.
*/
static int lnet_peer_queue_for_discovery(struct lnet_peer *lp)
{
int rc;
spin_lock(&lp->lp_lock);
if (!(lp->lp_state & LNET_PEER_DISCOVERING))
lp->lp_state |= LNET_PEER_DISCOVERING;
spin_unlock(&lp->lp_lock);
if (list_empty(&lp->lp_dc_list)) {
lnet_peer_addref_locked(lp);
list_add_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
wake_up(&the_lnet.ln_dc_waitq);
rc = 0;
} else {
rc = -EALREADY;
}
CDEBUG(D_NET, "Queue peer %s: %d\n",
libcfs_nidstr(&lp->lp_primary_nid), rc);
return rc;
}
/*
* Discovery of a peer is complete. Wake all waiters on the peer.
* Call with lnet_net_lock/EX held.
*/
static void lnet_peer_discovery_complete(struct lnet_peer *lp, int dc_error)
{
struct lnet_msg *msg, *tmp;
int rc = 0;
LIST_HEAD(pending_msgs);
CDEBUG(D_NET, "Discovery complete. Dequeue peer %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
spin_lock(&lp->lp_lock);
/* Our caller dropped lp_lock which may have allowed another thread to
* set LNET_PEER_DISCOVERING, or it may be set if dc_error is non-zero.
* Ensure it is cleared.
*/
lp->lp_state &= ~LNET_PEER_DISCOVERING;
if (dc_error) {
lp->lp_dc_error = dc_error;
lp->lp_state |= LNET_PEER_REDISCOVER;
}
list_splice_init(&lp->lp_dc_pendq, &pending_msgs);
spin_unlock(&lp->lp_lock);
list_del_init(&lp->lp_dc_list);
wake_up(&lp->lp_dc_waitq);
if (lp->lp_rtr_refcount > 0)
lnet_router_discovery_complete(lp);
lnet_net_unlock(LNET_LOCK_EX);
/* iterate through all pending messages and send them again */
list_for_each_entry_safe(msg, tmp, &pending_msgs, msg_list) {
list_del_init(&msg->msg_list);
if (dc_error) {
lnet_finalize(msg, dc_error);
continue;
}
CDEBUG(D_NET, "sending pending message %s to target %s\n",
lnet_msgtyp2str(msg->msg_type),
libcfs_idstr(&msg->msg_target));
rc = lnet_send(&msg->msg_src_nid_param, msg,
&msg->msg_rtr_nid_param);
if (rc < 0) {
CNETERR("Error sending %s to %s: %d\n",
lnet_msgtyp2str(msg->msg_type),
libcfs_idstr(&msg->msg_target), rc);
lnet_finalize(msg, rc);
}
}
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_decref_locked(lp);
}
/*
* Handle inbound push.
* Like any event handler, called with lnet_res_lock/CPT held.
*/
void lnet_peer_push_event(struct lnet_event *ev)
{
struct lnet_ping_buffer *pbuf;
struct lnet_peer *lp;
int infobytes;
pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start + ev->offset);
/* lnet_find_peer() adds a refcount */
lp = lnet_find_peer(&ev->source.nid);
if (!lp) {
CDEBUG(D_NET, "Push Put from unknown %s (source %s). Ignoring...\n",
libcfs_nidstr(&ev->initiator.nid),
libcfs_nidstr(&ev->source.nid));
pbuf->pb_needs_post = true;
return;
}
/* Ensure peer state remains consistent while we modify it. */
spin_lock(&lp->lp_lock);
/*
* If some kind of error happened the contents of the message
* cannot be used. Clear the NIDS_UPTODATE and set the
* FORCE_PING flag to trigger a ping.
*/
if (ev->status) {
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
lp->lp_state |= LNET_PEER_FORCE_PING;
CDEBUG(D_NET, "Push Put error %d from %s (source %s)\n",
ev->status,
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(&ev->source.nid));
goto out;
}
/*
* A push with invalid or corrupted info. Clear the UPTODATE
* flag to trigger a ping.
*/
if (lnet_ping_info_validate(&pbuf->pb_info)) {
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
lp->lp_state |= LNET_PEER_FORCE_PING;
CDEBUG(D_NET, "Corrupted Push from %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
goto out;
}
/* Make sure we'll allocate the correct size ping buffer when
* pinging the peer.
*/
infobytes = lnet_ping_info_size(&pbuf->pb_info);
if (lp->lp_data_bytes < infobytes)
lp->lp_data_bytes = infobytes;
/*
* A non-Multi-Rail peer is not supposed to be capable of
* sending a push.
*/
if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)) {
CERROR("Push from non-Multi-Rail peer %s dropped\n",
libcfs_nidstr(&lp->lp_primary_nid));
goto out;
}
/*
* The peer may have discovery disabled at its end. Set
* NO_DISCOVERY as appropriate.
*/
if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY)) {
CDEBUG(D_NET, "Peer %s has discovery disabled\n",
libcfs_nidstr(&lp->lp_primary_nid));
/*
* Mark the peer for deletion if we already know about it
* and it's going from discovery set to no discovery set
*/
if (!(lp->lp_state & (LNET_PEER_NO_DISCOVERY |
LNET_PEER_DISCOVERING)) &&
lp->lp_state & LNET_PEER_DISCOVERED) {
CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
libcfs_nidstr(&lp->lp_primary_nid),
lp->lp_state);
lp->lp_state |= LNET_PEER_MARK_DELETION;
}
lp->lp_state |= LNET_PEER_NO_DISCOVERY;
} else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
CDEBUG(D_NET, "Peer %s has discovery enabled\n",
libcfs_nidstr(&lp->lp_primary_nid));
lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
}
/*
* Update the MULTI_RAIL flag based on the push. If the peer
* was configured with DLC then the setting should match what
* DLC put in.
* NB: We verified above that the MR feature bit is set in pi_features
*/
if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
CDEBUG(D_NET, "peer %s(%p) is MR\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else if (lp->lp_state & LNET_PEER_CONFIGURED) {
CWARN("Push says %s is Multi-Rail, DLC says not\n",
libcfs_nidstr(&lp->lp_primary_nid));
} else if (lnet_peer_discovery_disabled) {
CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled locally\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
CDEBUG(D_NET, "peer %s(%p) not MR: DD disabled remotely\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else {
CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
lp->lp_state |= LNET_PEER_MULTI_RAIL;
lnet_peer_clr_non_mr_pref_nids(lp);
}
/* Check for truncation of the Put message. Clear the
* NIDS_UPTODATE flag and set FORCE_PING to trigger a ping,
* and tell discovery to allocate a bigger buffer.
*/
if (ev->mlength < ev->rlength) {
if (the_lnet.ln_push_target_nbytes < infobytes)
the_lnet.ln_push_target_nbytes = infobytes;
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
lp->lp_state |= LNET_PEER_FORCE_PING;
CDEBUG(D_NET, "Truncated Push from %s (%d bytes)\n",
libcfs_nidstr(&lp->lp_primary_nid), infobytes);
goto out;
}
/* always assume new data */
lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
/* If there is data present that hasn't been processed yet,
* we'll replace it if the Put contained newer data and it
* fits. We're racing with a Ping or earlier Push in this
* case.
*/
if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
if (LNET_PING_BUFFER_SEQNO(pbuf) >
LNET_PING_BUFFER_SEQNO(lp->lp_data) &&
infobytes <= lp->lp_data->pb_nbytes) {
unsafe_memcpy(&lp->lp_data->pb_info, &pbuf->pb_info,
infobytes, FLEXIBLE_OBJECT);
CDEBUG(D_NET, "Ping/Push race from %s: %u vs %u\n",
libcfs_nidstr(&lp->lp_primary_nid),
LNET_PING_BUFFER_SEQNO(pbuf),
LNET_PING_BUFFER_SEQNO(lp->lp_data));
}
goto out;
}
/*
* Allocate a buffer to copy the data. On a failure we drop
* the Push and set FORCE_PING to force the discovery
* thread to fix the problem by pinging the peer.
*/
lp->lp_data = lnet_ping_buffer_alloc(lp->lp_data_bytes, GFP_ATOMIC);
if (!lp->lp_data) {
lp->lp_state |= LNET_PEER_FORCE_PING;
CDEBUG(D_NET, "Cannot allocate Push buffer for %s %u\n",
libcfs_nidstr(&lp->lp_primary_nid),
LNET_PING_BUFFER_SEQNO(pbuf));
goto out;
}
/* Success */
unsafe_memcpy(&lp->lp_data->pb_info, &pbuf->pb_info, infobytes,
FLEXIBLE_OBJECT);
lp->lp_state |= LNET_PEER_DATA_PRESENT;
CDEBUG(D_NET, "Received Push %s %u\n",
libcfs_nidstr(&lp->lp_primary_nid),
LNET_PING_BUFFER_SEQNO(pbuf));
out:
/* We've processed this buffer. It can be reposted */
pbuf->pb_needs_post = true;
/*
* Queue the peer for discovery if not done, force it on the request
* queue and wake the discovery thread if the peer was already queued,
* because its status changed.
*/
spin_unlock(&lp->lp_lock);
lnet_net_lock(LNET_LOCK_EX);
if (!lnet_peer_is_uptodate(lp) && lnet_peer_queue_for_discovery(lp)) {
list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
wake_up(&the_lnet.ln_dc_waitq);
}
/* Drop refcount from lookup */
lnet_peer_decref_locked(lp);
lnet_net_unlock(LNET_LOCK_EX);
}
/*
* Clear the discovery error state, unless we're already discovering
* this peer, in which case the error is current.
*/
static void lnet_peer_clear_discovery_error(struct lnet_peer *lp)
{
spin_lock(&lp->lp_lock);
if (!(lp->lp_state & LNET_PEER_DISCOVERING))
lp->lp_dc_error = 0;
spin_unlock(&lp->lp_lock);
}
/*
* Peer discovery slow path. The ln_api_mutex is held on entry, and
* dropped/retaken within this function. An lnet_peer_ni is passed in
* because discovery could tear down an lnet_peer.
*/
int
lnet_discover_peer_locked(struct lnet_peer_ni *lpni, int cpt, bool block)
{
DEFINE_WAIT(wait);
struct lnet_peer *lp = NULL;
int rc = 0;
int count = 0;
again:
if (lp)
lnet_peer_decref_locked(lp);
lnet_net_unlock(cpt);
lnet_net_lock(LNET_LOCK_EX);
lp = lpni->lpni_peer_net->lpn_peer;
lnet_peer_clear_discovery_error(lp);
/*
* We're willing to be interrupted. The lpni can become a
* zombie if we race with DLC, so we must check for that.
*/
for (;;) {
/* Keep lp alive when the lnet_net_lock is unlocked */
lnet_peer_addref_locked(lp);
prepare_to_wait(&lp->lp_dc_waitq, &wait, TASK_INTERRUPTIBLE);
if (signal_pending(current))
break;
if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
break;
/*
* Don't repeat discovery if discovery is disabled. This is
* done to ensure we can use discovery as a standard ping as
* well for backwards compatibility with routers which do not
* have discovery or have discovery disabled
*/
if (lnet_is_discovery_disabled(lp) && count > 0)
break;
if (lp->lp_dc_error)
break;
if (lnet_peer_is_uptodate(lp))
break;
if (lp->lp_state & LNET_PEER_MARK_DELETED)
break;
lnet_peer_queue_for_discovery(lp);
count++;
CDEBUG(D_NET, "Discovery attempt # %d\n", count);
/*
* If caller requested a non-blocking operation then
* return immediately. Once discovery is complete any
* pending messages that were stopped due to discovery
* will be transmitted.
*/
if (!block)
break;
lnet_net_unlock(LNET_LOCK_EX);
schedule();
finish_wait(&lp->lp_dc_waitq, &wait);
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_decref_locked(lp);
/* Peer may have changed */
lp = lpni->lpni_peer_net->lpn_peer;
}
finish_wait(&lp->lp_dc_waitq, &wait);
lnet_net_unlock(LNET_LOCK_EX);
lnet_net_lock(cpt);
/*
* The peer may have changed, so re-check and rediscover if that turns
* out to have been the case. The reference count on lp ensured that
* even if it was unlinked from lpni the memory could not be recycled.
* Thus the check below is sufficient to determine whether the peer
* changed. If the peer changed, then lp must not be dereferenced.
*/
if (lp != lpni->lpni_peer_net->lpn_peer)
goto again;
if (signal_pending(current))
rc = -EINTR;
else if (the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING)
rc = -ESHUTDOWN;
else if (lp->lp_dc_error)
rc = lp->lp_dc_error;
else if (!block)
CDEBUG(D_NET, "non-blocking discovery\n");
else if (!lnet_peer_is_uptodate(lp) &&
!(lnet_is_discovery_disabled(lp) ||
(lp->lp_state & LNET_PEER_MARK_DELETED)))
goto again;
CDEBUG(D_NET, "peer %s NID %s: %d. %s\n",
(lp ? libcfs_nidstr(&lp->lp_primary_nid) : "(none)"),
libcfs_nidstr(&lpni->lpni_nid), rc,
(!block) ? "pending discovery" : "discovery complete");
lnet_peer_decref_locked(lp);
return rc;
}
/* Handle an incoming ack for a push. */
static void
lnet_discovery_event_ack(struct lnet_peer *lp, struct lnet_event *ev)
{
struct lnet_ping_buffer *pbuf;
pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
spin_lock(&lp->lp_lock);
lp->lp_state &= ~LNET_PEER_PUSH_SENT;
lp->lp_push_error = ev->status;
if (ev->status)
lp->lp_state |= LNET_PEER_PUSH_FAILED;
else
lp->lp_node_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
spin_unlock(&lp->lp_lock);
CDEBUG(D_NET, "peer %s ev->status %d\n",
libcfs_nidstr(&lp->lp_primary_nid), ev->status);
}
static bool find_primary(struct lnet_nid *nid,
struct lnet_ping_buffer *pbuf)
{
struct lnet_ping_info *pi = &pbuf->pb_info;
struct lnet_ping_iter piter;
__u32 *stp;
if (pi->pi_features & LNET_PING_FEAT_PRIMARY_LARGE) {
/* First large nid is primary */
for (stp = ping_iter_first(&piter, pbuf, nid);
stp;
stp = ping_iter_next(&piter, nid)) {
if (nid_is_nid4(nid))
continue;
/* nid has already been copied in */
return true;
}
/* no large nids ... weird ... ignore the flag
* and use first nid.
*/
}
/* pi_nids[1] is primary */
if (pi->pi_nnis < 2)
return false;
lnet_nid4_to_nid(pbuf->pb_info.pi_ni[1].ns_nid, nid);
return true;
}
/* Handle a Reply message. This is the reply to a Ping message. */
static void
lnet_discovery_event_reply(struct lnet_peer *lp, struct lnet_event *ev)
{
struct lnet_ping_buffer *pbuf;
struct lnet_nid primary;
int infobytes;
int rc;
bool ping_feat_disc;
spin_lock(&lp->lp_lock);
lp->lp_disc_src_nid = ev->target.nid;
lp->lp_disc_dst_nid = ev->source.nid;
/*
* If some kind of error happened the contents of message
* cannot be used. Set PING_FAILED to trigger a retry.
*/
if (ev->status) {
lp->lp_state |= LNET_PEER_PING_FAILED;
lp->lp_ping_error = ev->status;
CDEBUG(D_NET, "Ping Reply error %d from %s (source %s)\n",
ev->status,
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(&ev->source.nid));
goto out;
}
pbuf = LNET_PING_INFO_TO_BUFFER(ev->md_start);
if (pbuf->pb_info.pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
lnet_swap_pinginfo(pbuf);
/*
* A reply with invalid or corrupted info. Set PING_FAILED to
* trigger a retry.
*/
rc = lnet_ping_info_validate(&pbuf->pb_info);
if (rc) {
lp->lp_state |= LNET_PEER_PING_FAILED;
lp->lp_ping_error = 0;
CDEBUG(D_NET, "Corrupted Ping Reply from %s: %d\n",
libcfs_nidstr(&lp->lp_primary_nid), rc);
goto out;
}
/*
* The peer may have discovery disabled at its end. Set
* NO_DISCOVERY as appropriate.
*/
ping_feat_disc = pbuf->pb_info.pi_features & LNET_PING_FEAT_DISCOVERY;
if (!ping_feat_disc || lnet_peer_discovery_disabled) {
CDEBUG(D_NET, "Peer %s has discovery %s, local discovery %s\n",
libcfs_nidstr(&lp->lp_primary_nid),
ping_feat_disc ? "enabled" : "disabled",
lnet_peer_discovery_disabled ? "disabled" : "enabled");
/* Detect whether this peer has toggled discovery from on to
* off and whether we can delete and re-create the peer. Peers
* that were manually configured cannot be deleted by discovery.
* We need to delete this peer and re-create it if the peer was
* not configured manually, is currently considered DD capable,
* and either:
* 1. We've already discovered the peer (the peer has toggled
* the discovery feature from on to off), or
* 2. The peer is considered MR, but it was not user configured
* (this was a "temporary" peer created via the kernel APIs
* that we're discovering for the first time)
*/
if (!(lp->lp_state & (LNET_PEER_CONFIGURED |
LNET_PEER_NO_DISCOVERY)) &&
(lp->lp_state & (LNET_PEER_DISCOVERED |
LNET_PEER_MULTI_RAIL))) {
CDEBUG(D_NET, "Marking %s:0x%x for deletion\n",
libcfs_nidstr(&lp->lp_primary_nid),
lp->lp_state);
lp->lp_state |= LNET_PEER_MARK_DELETION;
}
lp->lp_state |= LNET_PEER_NO_DISCOVERY;
} else {
CDEBUG(D_NET, "Peer %s has discovery enabled\n",
libcfs_nidstr(&lp->lp_primary_nid));
lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
}
/*
* Update the MULTI_RAIL flag based on the reply. If the peer
* was configured with DLC then the setting should match what
* DLC put in.
*/
if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL) {
if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
CDEBUG(D_NET, "peer %s(%p) is MR\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else if (lp->lp_state & LNET_PEER_CONFIGURED) {
CWARN("Reply says %s is Multi-Rail, DLC says not\n",
libcfs_nidstr(&lp->lp_primary_nid));
} else if (lnet_peer_discovery_disabled) {
CDEBUG(D_NET,
"peer %s(%p) not MR: DD disabled locally\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else if (lp->lp_state & LNET_PEER_NO_DISCOVERY) {
CDEBUG(D_NET,
"peer %s(%p) not MR: DD disabled remotely\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
} else {
CDEBUG(D_NET, "peer %s(%p) is MR capable\n",
libcfs_nidstr(&lp->lp_primary_nid), lp);
lp->lp_state |= LNET_PEER_MULTI_RAIL;
lnet_peer_clr_non_mr_pref_nids(lp);
}
} else if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
if (lp->lp_state & LNET_PEER_CONFIGURED) {
CWARN("DLC says %s is Multi-Rail, Reply says not\n",
libcfs_nidstr(&lp->lp_primary_nid));
} else {
CERROR("Multi-Rail state vanished from %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
lp->lp_state &= ~LNET_PEER_MULTI_RAIL;
}
}
infobytes = lnet_ping_info_size(&pbuf->pb_info);
/*
* Make sure we'll allocate the correct size ping buffer when
* pinging the peer.
*/
if (lp->lp_data_bytes < infobytes)
lp->lp_data_bytes = infobytes;
/* Check for truncation of the Reply. Clear PING_SENT and set
* PING_FAILED to trigger a retry.
*/
if (pbuf->pb_nbytes < infobytes) {
if (the_lnet.ln_push_target_nbytes < infobytes)
the_lnet.ln_push_target_nbytes = infobytes;
lp->lp_state |= LNET_PEER_PING_FAILED;
lp->lp_ping_error = 0;
CDEBUG(D_NET, "Truncated Reply from %s (%d bytes)\n",
libcfs_nidstr(&lp->lp_primary_nid), infobytes);
goto out;
}
/*
* Check the sequence numbers in the reply. These are only
* available if the reply came from a Multi-Rail peer.
*/
if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL &&
find_primary(&primary, pbuf) &&
nid_same(&lp->lp_primary_nid, &primary)) {
if (LNET_PING_BUFFER_SEQNO(pbuf) < lp->lp_peer_seqno)
CDEBUG(D_NET, "peer %s: seq# got %u have %u. peer rebooted?\n",
libcfs_nidstr(&lp->lp_primary_nid),
LNET_PING_BUFFER_SEQNO(pbuf),
lp->lp_peer_seqno);
lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
}
/* We're happy with the state of the data in the buffer. */
CDEBUG(D_NET, "peer %s data present %u. state = 0x%x\n",
libcfs_nidstr(&lp->lp_primary_nid), lp->lp_peer_seqno,
lp->lp_state);
if (lp->lp_state & LNET_PEER_DATA_PRESENT)
kref_put(&lp->lp_data->pb_refcnt, lnet_ping_buffer_free);
else
lp->lp_state |= LNET_PEER_DATA_PRESENT;
kref_get(&pbuf->pb_refcnt);
lp->lp_data = pbuf;
out:
lp->lp_state &= ~LNET_PEER_PING_SENT;
spin_unlock(&lp->lp_lock);
}
/*
* Send event handling. Only matters for error cases, where we clean
* up state on the peer and peer_ni that would otherwise be updated in
* the REPLY event handler for a successful Ping, and the ACK event
* handler for a successful Push.
*/
static int
lnet_discovery_event_send(struct lnet_peer *lp, struct lnet_event *ev)
{
int rc = 0;
if (!ev->status)
goto out;
spin_lock(&lp->lp_lock);
if (ev->msg_type == LNET_MSG_GET) {
lp->lp_state &= ~LNET_PEER_PING_SENT;
lp->lp_state |= LNET_PEER_PING_FAILED;
lp->lp_ping_error = ev->status;
} else { /* ev->msg_type == LNET_MSG_PUT */
lp->lp_state &= ~LNET_PEER_PUSH_SENT;
lp->lp_state |= LNET_PEER_PUSH_FAILED;
lp->lp_push_error = ev->status;
}
spin_unlock(&lp->lp_lock);
rc = LNET_REDISCOVER_PEER;
out:
CDEBUG(D_NET, "%s Send to %s: %d\n",
(ev->msg_type == LNET_MSG_GET ? "Ping" : "Push"),
libcfs_nidstr(&ev->target.nid), rc);
return rc;
}
/*
* Unlink event handling. This event is only seen if a call to
* LNetMDUnlink() caused the event to be unlinked. If this call was
* made after the event was set up in LNetGet() or LNetPut() then we
* assume the Ping or Push timed out.
*/
static void
lnet_discovery_event_unlink(struct lnet_peer *lp, struct lnet_event *ev)
{
spin_lock(&lp->lp_lock);
/* We've passed through LNetGet() */
if (lp->lp_state & LNET_PEER_PING_SENT) {
lp->lp_state &= ~LNET_PEER_PING_SENT;
lp->lp_state |= LNET_PEER_PING_FAILED;
lp->lp_ping_error = -ETIMEDOUT;
CDEBUG(D_NET, "Ping Unlink for message to peer %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
}
/* We've passed through LNetPut() */
if (lp->lp_state & LNET_PEER_PUSH_SENT) {
lp->lp_state &= ~LNET_PEER_PUSH_SENT;
lp->lp_state |= LNET_PEER_PUSH_FAILED;
lp->lp_push_error = -ETIMEDOUT;
CDEBUG(D_NET, "Push Unlink for message to peer %s\n",
libcfs_nidstr(&lp->lp_primary_nid));
}
spin_unlock(&lp->lp_lock);
}
/*
* Event handler for the discovery EQ.
*
* Called with lnet_res_lock(cpt) held. The cpt is the
* lnet_cpt_of_cookie() of the md handle cookie.
*/
static void lnet_discovery_event_handler(struct lnet_event *event)
{
struct lnet_peer *lp = event->md_user_ptr;
struct lnet_ping_buffer *pbuf;
int rc;
/* discovery needs to take another look */
rc = LNET_REDISCOVER_PEER;
CDEBUG(D_NET, "Received event: %d\n", event->type);
switch (event->type) {
case LNET_EVENT_ACK:
lnet_discovery_event_ack(lp, event);
break;
case LNET_EVENT_REPLY:
lnet_discovery_event_reply(lp, event);
break;
case LNET_EVENT_SEND:
/* Only send failure triggers a retry. */
rc = lnet_discovery_event_send(lp, event);
break;
case LNET_EVENT_UNLINK:
/* LNetMDUnlink() was called */
lnet_discovery_event_unlink(lp, event);
break;
default:
/* Invalid events. */
LBUG();
}
lnet_net_lock(LNET_LOCK_EX);
/* put peer back at end of request queue, if discovery not already
* done */
if (rc == LNET_REDISCOVER_PEER && !lnet_peer_is_uptodate(lp) &&
lnet_peer_queue_for_discovery(lp)) {
list_move_tail(&lp->lp_dc_list, &the_lnet.ln_dc_request);
wake_up(&the_lnet.ln_dc_waitq);
}
if (event->unlinked) {
pbuf = LNET_PING_INFO_TO_BUFFER(event->md_start);
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
lnet_peer_decref_locked(lp);
}
lnet_net_unlock(LNET_LOCK_EX);
}
u32 *ping_iter_first(struct lnet_ping_iter *pi,
struct lnet_ping_buffer *pbuf,
struct lnet_nid *nid)
{
pi->pinfo = &pbuf->pb_info;
pi->pos = &pbuf->pb_info.pi_ni;
pi->end = (void *)pi->pinfo +
min_t(int, pbuf->pb_nbytes,
lnet_ping_info_size(pi->pinfo));
/* lnet_ping_info_validiate ensures there will be one
* lnet_ni_status at the start
*/
if (nid)
lnet_nid4_to_nid(pbuf->pb_info.pi_ni[0].ns_nid, nid);
pi->pos += sizeof(struct lnet_ni_status);
return &pbuf->pb_info.pi_ni[0].ns_status;
}
u32 *ping_iter_next(struct lnet_ping_iter *pi, struct lnet_nid *nid)
{
int off = offsetof(struct lnet_ping_info, pi_ni[pi->pinfo->pi_nnis]);
if (pi->pos < ((void *)pi->pinfo + off)) {
struct lnet_ni_status *ns = pi->pos;
pi->pos = ns + 1;
if (pi->pos > pi->end)
return NULL;
if (nid)
lnet_nid4_to_nid(ns->ns_nid, nid);
return &ns->ns_status;
}
while (pi->pinfo->pi_features & LNET_PING_FEAT_LARGE_ADDR) {
struct lnet_ni_large_status *lns = pi->pos;
if (pi->pos + 8 > pi->end)
/* Not safe to examine next */
return NULL;
pi->pos = lnet_ping_sts_next(lns);
if (pi->pos > pi->end)
return NULL;
if (NID_BYTES(&lns->ns_nid) > sizeof(struct lnet_nid))
continue;
if (nid)
*nid = lns->ns_nid;
return &lns->ns_status;
}
return NULL;
}
int ping_info_count_entries(struct lnet_ping_buffer *pbuf)
{
struct lnet_ping_iter pi;
u32 *st;
int nnis = 0;
for (st = ping_iter_first(&pi, pbuf, NULL); st;
st = ping_iter_next(&pi, NULL))
nnis += 1;
return nnis;
}
static inline void handle_disc_lpni_health(struct lnet_peer_ni *lpni,
__u32 new_status)
{
__u32 old_status;
spin_lock(&lpni->lpni_lock);
old_status = lpni->lpni_ns_status;
lpni->lpni_ns_status = new_status;
spin_unlock(&lpni->lpni_lock);
/* Decrement health when transitioning from UP to DOWN */
if (old_status != new_status) {
CDEBUG(D_NET, "lpni %s(%p) status changed from %#x to %#x\n",
libcfs_nidstr(&lpni->lpni_nid), lpni, old_status,
new_status);
if (new_status == LNET_NI_STATUS_DOWN) {
lnet_net_lock(0);
lnet_handle_remote_failure_locked(lpni);
lnet_net_unlock(0);
}
} else if (new_status == LNET_NI_STATUS_UP && !lpni->lpni_last_alive) {
/* Set health to max if the initial status is UP */
atomic_set(&lpni->lpni_healthv, LNET_MAX_HEALTH_VALUE);
}
}
/*
* Build a peer from incoming data.
*
* The NIDs in the incoming data are supposed to be structured as follows:
* - loopback
* - primary NID
* - other NIDs in same net
* - NIDs in second net
* - NIDs in third net
* - ...
* This due to the way the list of NIDs in the data is created.
*
* Note that this function will mark the peer uptodate unless an
* ENOMEM is encontered. All other errors are due to a conflict
* between the DLC configuration and what discovery sees. We treat DLC
* as binding, and therefore set the NIDS_UPTODATE flag to prevent the
* peer from becoming stuck in discovery.
*/
static int lnet_peer_merge_data(struct lnet_peer *lp,
struct lnet_ping_buffer *pbuf)
{
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
struct lnet_nid *curnis = NULL;
struct lnet_ni_large_status *addnis = NULL;
struct lnet_nid *delnis = NULL;
struct lnet_ping_iter pi;
struct lnet_nid nid;
u32 *stp;
unsigned int flags;
int ncurnis;
int naddnis;
int ndelnis;
int nnis = 0;
int i;
int j;
int rc;
flags = LNET_PEER_DISCOVERED;
if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
flags |= LNET_PEER_MULTI_RAIL;
/*
* Cache the routing feature for the peer; whether it is enabled
* or disabled as reported by the remote peer.
*/
spin_lock(&lp->lp_lock);
if (!(pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED))
lp->lp_state |= LNET_PEER_ROUTER_ENABLED;
else
lp->lp_state &= ~LNET_PEER_ROUTER_ENABLED;
spin_unlock(&lp->lp_lock);
nnis = ping_info_count_entries(pbuf);
nnis = max_t(int, lp->lp_nnis, nnis);
CFS_ALLOC_PTR_ARRAY(curnis, nnis);
CFS_ALLOC_PTR_ARRAY(addnis, nnis);
CFS_ALLOC_PTR_ARRAY(delnis, nnis);
if (!curnis || !addnis || !delnis) {
rc = -ENOMEM;
goto out;
}
ncurnis = 0;
naddnis = 0;
ndelnis = 0;
/* Construct the list of NIDs present in peer. */
lpni = NULL;
while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL)
curnis[ncurnis++] = lpni->lpni_nid;
/* Check for NIDs in pbuf not present in curnis[].
* Skip the first, which is loop-back. Take second as
* primary, unless a large primary is found.
*/
ping_iter_first(&pi, pbuf, NULL);
stp = ping_iter_next(&pi, &nid);
for (; stp; stp = ping_iter_next(&pi, &nid)) {
for (j = 0; j < ncurnis; j++)
if (nid_same(&nid, &curnis[j]))
break;
if (j == ncurnis) {
addnis[naddnis].ns_nid = nid;
addnis[naddnis].ns_status = *stp;
naddnis += 1;
}
}
/*
* Check for NIDs in curnis[] not present in pbuf.
* The nested loop starts at 1 to skip the loopback NID.
*
* But never add the loopback NID to delnis[]: if it is
* present in curnis[] then this peer is for this node.
*/
for (i = 0; i < ncurnis; i++) {
if (nid_is_lo0(&curnis[i]))
continue;
ping_iter_first(&pi, pbuf, NULL);
while ((stp = ping_iter_next(&pi, &nid)) != NULL) {
if (nid_same(&curnis[i], &nid)) {
/*
* update the information we cache for the
* peer with the latest information we
* received
*/
lpni = lnet_peer_ni_find_locked(&curnis[i]);
if (lpni) {
handle_disc_lpni_health(lpni, *stp);
lnet_peer_ni_decref_locked(lpni);
}
break;
}
}
if (!stp)
delnis[ndelnis++] = curnis[i];
}
/*
* If we get here and the discovery is disabled then we don't want
* to add or delete any NIs. We just updated the ones we have some
* information on, and call it a day
*/
rc = 0;
if (lnet_is_discovery_disabled(lp))
goto out;
for (i = 0; i < naddnis; i++) {
rc = lnet_peer_add_nid(lp, &addnis[i].ns_nid, flags);
if (rc) {
CERROR("Error adding NID %s to peer %s: %d\n",
libcfs_nidstr(&addnis[i].ns_nid),
libcfs_nidstr(&lp->lp_primary_nid), rc);
if (rc == -ENOMEM)
goto out;
}
lpni = lnet_peer_ni_find_locked(&addnis[i].ns_nid);
if (lpni) {
handle_disc_lpni_health(lpni, addnis[i].ns_status);
lnet_peer_ni_decref_locked(lpni);
}
}
for (i = 0; i < ndelnis; i++) {
/*
* for routers it's okay to delete the primary_nid because
* the upper layers don't really rely on it. So if we're
* being told that the router changed its primary_nid
* then it's okay to delete it.
*/
if (lp->lp_rtr_refcount > 0)
flags |= LNET_PEER_RTR_NI_FORCE_DEL;
rc = lnet_peer_del_nid(lp, &delnis[i], flags);
if (rc) {
if (rc == -EPERM) {
lpni = lnet_peer_ni_find_locked(&delnis[i]);
if (lpni) {
handle_disc_lpni_health(lpni,
LNET_NI_STATUS_DOWN);
lnet_peer_ni_decref_locked(lpni);
}
} else {
CERROR("Error deleting NID %s from peer %s: %d\n",
libcfs_nidstr(&delnis[i]),
libcfs_nidstr(&lp->lp_primary_nid), rc);
}
if (rc == -ENOMEM)
goto out;
}
}
/* The peer net for the primary NID should be the first entry in the
* peer's lp_peer_nets list, and the peer NI for the primary NID should
* be the first entry in its peer net's lpn_peer_nis list.
*/
find_primary(&nid, pbuf);
lpni = lnet_peer_ni_find_locked(&nid);
if (!lpni) {
CERROR("Internal error: Failed to lookup peer NI for primary NID: %s\n",
libcfs_nidstr(&nid));
goto out;
}
lpn = lpni->lpni_peer_net;
if (lpn->lpn_peer_nets.prev != &lp->lp_peer_nets)
list_move(&lpn->lpn_peer_nets, &lp->lp_peer_nets);
if (lpni->lpni_peer_nis.prev != &lpni->lpni_peer_net->lpn_peer_nis)
list_move(&lpni->lpni_peer_nis,
&lpni->lpni_peer_net->lpn_peer_nis);
lnet_peer_ni_decref_locked(lpni);
/*
* Errors other than -ENOMEM are due to peers having been
* configured with DLC. Ignore these because DLC overrides
* Discovery.
*/
rc = 0;
out:
/* If this peer is a gateway, invoke the routing callback to update
* the associated route status
*/
if (lp->lp_rtr_refcount > 0)
lnet_router_discovery_ping_reply(lp, pbuf);
CFS_FREE_PTR_ARRAY(curnis, nnis);
CFS_FREE_PTR_ARRAY(addnis, nnis);
CFS_FREE_PTR_ARRAY(delnis, nnis);
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
CDEBUG(D_NET, "peer %s (%p): %d\n",
libcfs_nidstr(&lp->lp_primary_nid), lp, rc);
if (rc) {
spin_lock(&lp->lp_lock);
lp->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
lp->lp_state |= LNET_PEER_FORCE_PING;
spin_unlock(&lp->lp_lock);
}
return rc;
}
/*
* The data in pbuf says lp is its primary peer, but the data was
* received by a different peer. Try to update lp with the data.
*/
static int
lnet_peer_set_primary_data(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf)
{
struct lnet_handle_md mdh;
/* Queue lp for discovery, and force it on the request queue. */
lnet_net_lock(LNET_LOCK_EX);
if (lnet_peer_queue_for_discovery(lp))
list_move(&lp->lp_dc_list, &the_lnet.ln_dc_request);
lnet_net_unlock(LNET_LOCK_EX);
LNetInvalidateMDHandle(&mdh);
/*
* Decide whether we can move the peer to the DATA_PRESENT state.
*
* We replace stale data for a multi-rail peer, repair PING_FAILED
* status, and preempt FORCE_PING.
*
* If after that we have DATA_PRESENT, we merge it into this peer.
*/
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_MULTI_RAIL) {
if (lp->lp_peer_seqno < LNET_PING_BUFFER_SEQNO(pbuf)) {
lp->lp_peer_seqno = LNET_PING_BUFFER_SEQNO(pbuf);
} else if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
pbuf = lp->lp_data;
lp->lp_data = NULL;
}
}
if (lp->lp_state & LNET_PEER_DATA_PRESENT) {
kref_put(&lp->lp_data->pb_refcnt, lnet_ping_buffer_free);
lp->lp_data = NULL;
lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
}
if (lp->lp_state & LNET_PEER_PING_FAILED) {
mdh = lp->lp_ping_mdh;
LNetInvalidateMDHandle(&lp->lp_ping_mdh);
lp->lp_state &= ~LNET_PEER_PING_FAILED;
lp->lp_ping_error = 0;
}
if (lp->lp_state & LNET_PEER_FORCE_PING)
lp->lp_state &= ~LNET_PEER_FORCE_PING;
lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
spin_unlock(&lp->lp_lock);
if (!LNetMDHandleIsInvalid(mdh))
LNetMDUnlink(mdh);
if (pbuf)
return lnet_peer_merge_data(lp, pbuf);
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
return 0;
}
static bool lnet_is_nid_in_ping_info(struct lnet_nid *nid,
struct lnet_ping_buffer *pbuf)
{
struct lnet_ping_iter pi;
struct lnet_nid pnid;
u32 *st;
for (st = ping_iter_first(&pi, pbuf, &pnid);
st;
st = ping_iter_next(&pi, &pnid))
if (nid_same(nid, &pnid))
return true;
return false;
}
/* Delete a peer that has been marked for deletion. NB: when this peer was added
* to the discovery queue a reference was taken that will prevent the peer from
* actually being freed by this function. After this function exits the
* discovery thread should call lnet_peer_discovery_complete() which will
* drop that reference as well as wake any waiters that may also be holding a
* ref on the peer
*/
static int lnet_peer_deletion(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
struct list_head rlist;
struct lnet_route *route, *tmp;
int rc = 0;
INIT_LIST_HEAD(&rlist);
CDEBUG(D_NET, "peer %s(%p) state %#x\n",
libcfs_nidstr(&lp->lp_primary_nid), lp, lp->lp_state);
/* no-op if lnet_peer_del() has already been called on this peer */
if (lp->lp_state & LNET_PEER_MARK_DELETED)
goto clear_discovering;
spin_unlock(&lp->lp_lock);
mutex_lock(&the_lnet.ln_api_mutex);
if (the_lnet.ln_state != LNET_STATE_RUNNING ||
the_lnet.ln_dc_state != LNET_DC_STATE_RUNNING) {
mutex_unlock(&the_lnet.ln_api_mutex);
spin_lock(&lp->lp_lock);
rc = -ESHUTDOWN;
goto clear_discovering;
}
lnet_peer_cancel_discovery(lp);
lnet_net_lock(LNET_LOCK_EX);
list_for_each_entry_safe(route, tmp,
&lp->lp_routes,
lr_gwlist)
lnet_move_route(route, NULL, &rlist);
/* lnet_peer_del_locked() deletes all the peer NIs owned by this peer */
rc = lnet_peer_del_locked(lp);
if (rc)
CNETERR("Internal error: Unable to delete peer %s rc %d\n",
libcfs_nidstr(&lp->lp_primary_nid), rc);
lnet_net_unlock(LNET_LOCK_EX);
list_for_each_entry_safe(route, tmp,
&rlist, lr_list) {
/* re-add these routes */
lnet_add_route(route->lr_net,
route->lr_hops,
&route->lr_nid,
route->lr_priority);
LIBCFS_FREE(route, sizeof(*route));
}
mutex_unlock(&the_lnet.ln_api_mutex);
spin_lock(&lp->lp_lock);
rc = 0;
clear_discovering:
lp->lp_state &= ~(LNET_PEER_DISCOVERING | LNET_PEER_FORCE_PING |
LNET_PEER_FORCE_PUSH);
return rc;
}
/*
* Update a peer using the data received.
*/
static int lnet_peer_data_present(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
struct lnet_ping_buffer *pbuf;
struct lnet_peer_ni *lpni;
struct lnet_nid nid;
unsigned int flags;
int rc = 0;
pbuf = lp->lp_data;
lp->lp_data = NULL;
lp->lp_state &= ~LNET_PEER_DATA_PRESENT;
lp->lp_state |= LNET_PEER_NIDS_UPTODATE;
spin_unlock(&lp->lp_lock);
/*
* Modifications of peer structures are done while holding the
* ln_api_mutex. A global lock is required because we may be
* modifying multiple peer structures, and a mutex greatly
* simplifies memory management.
*
* The actual changes to the data structures must also protect
* against concurrent lookups, for which the lnet_net_lock in
* LNET_LOCK_EX mode is used.
*/
mutex_lock(&the_lnet.ln_api_mutex);
if (the_lnet.ln_state != LNET_STATE_RUNNING) {
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
rc = -ESHUTDOWN;
goto out;
}
/*
* If this peer is not on the peer list then it is being torn
* down, and our reference count may be all that is keeping it
* alive. Don't do any work on it.
*/
if (list_empty(&lp->lp_peer_list)) {
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
goto out;
}
flags = LNET_PEER_DISCOVERED;
if (pbuf->pb_info.pi_features & LNET_PING_FEAT_MULTI_RAIL)
flags |= LNET_PEER_MULTI_RAIL;
/*
* Check whether the primary NID in the message matches the
* primary NID of the peer. If it does, update the peer, if
* it it does not, check whether there is already a peer with
* that primary NID. If no such peer exists, try to update
* the primary NID of the current peer (allowed if it was
* created due to message traffic) and complete the update.
* If the peer did exist, hand off the data to it.
*
* The peer for the loopback interface is a special case: this
* is the peer for the local node, and we want to set its
* primary NID to the correct value here. Moreover, this peer
* can show up with only the loopback NID in the ping buffer.
*/
if (!find_primary(&nid, pbuf)) {
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
goto out;
}
/* If lp_merge_primary_nid is set, assign it as primary,
* which causes the peers to merge.
*/
if (!LNET_NID_IS_ANY(&lp->lp_merge_primary_nid)) {
lnet_peer_set_primary_nid(lp, &lp->lp_merge_primary_nid,
flags);
lp->lp_merge_primary_nid = LNET_ANY_NID;
}
if (nid_is_lo0(&lp->lp_primary_nid)) {
rc = lnet_peer_set_primary_nid(lp, &nid, flags);
if (rc)
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
else
rc = lnet_peer_merge_data(lp, pbuf);
/*
* if the primary nid of the peer is present in the ping info returned
* from the peer, but it's not the local primary peer we have
* cached and discovery is disabled, then we don't want to update
* our local peer info, by adding or removing NIDs, we just want
* to update the status of the nids that we currently have
* recorded in that peer.
*/
} else if (nid_same(&lp->lp_primary_nid, &nid) ||
(lnet_is_nid_in_ping_info(&lp->lp_primary_nid, pbuf) &&
lnet_is_discovery_disabled(lp))) {
rc = lnet_peer_merge_data(lp, pbuf);
} else {
lpni = lnet_peer_ni_find_locked(&nid);
if (!lpni || lp == lpni->lpni_peer_net->lpn_peer) {
rc = lnet_peer_set_primary_nid(lp, &nid, flags);
if (rc) {
CERROR("Primary NID error %s versus %s: %d\n",
libcfs_nidstr(&lp->lp_primary_nid),
libcfs_nidstr(&nid), rc);
kref_put(&pbuf->pb_refcnt,
lnet_ping_buffer_free);
} else {
rc = lnet_peer_merge_data(lp, pbuf);
}
if (lpni)
lnet_peer_ni_decref_locked(lpni);
} else {
struct lnet_peer *new_lp;
new_lp = lpni->lpni_peer_net->lpn_peer;
/*
* if lp has discovery/MR enabled that means new_lp
* should have discovery/MR enabled as well, since
* it's the same peer, which we're about to merge
*/
spin_lock(&lp->lp_lock);
spin_lock(&new_lp->lp_lock);
if (!(lp->lp_state & LNET_PEER_NO_DISCOVERY))
new_lp->lp_state &= ~LNET_PEER_NO_DISCOVERY;
if (lp->lp_state & LNET_PEER_MULTI_RAIL)
new_lp->lp_state |= LNET_PEER_MULTI_RAIL;
/* If we're processing a ping reply then we may be
* about to send a push to the peer that we ping'd.
* Since the ping reply that we're processing was
* received by lp, we need to set the discovery source
* NID for new_lp to the NID stored in lp.
*/
if (!LNET_NID_IS_ANY(&lp->lp_disc_src_nid)) {
new_lp->lp_disc_src_nid = lp->lp_disc_src_nid;
new_lp->lp_disc_dst_nid = lp->lp_disc_dst_nid;
}
spin_unlock(&new_lp->lp_lock);
spin_unlock(&lp->lp_lock);
rc = lnet_peer_set_primary_data(new_lp, pbuf);
lnet_consolidate_routes_locked(lp, new_lp);
lnet_peer_ni_decref_locked(lpni);
}
}
out:
CDEBUG(D_NET, "peer %s(%p): %d. state = 0x%x\n",
libcfs_nidstr(&lp->lp_primary_nid), lp, rc,
lp->lp_state);
mutex_unlock(&the_lnet.ln_api_mutex);
spin_lock(&lp->lp_lock);
/* Tell discovery to re-check the peer immediately. */
if (!rc)
rc = LNET_REDISCOVER_PEER;
return rc;
}
/*
* A ping failed. Clear the PING_FAILED state and set the
* FORCE_PING state, to ensure a retry even if discovery is
* disabled. This avoids being left with incorrect state.
*/
static int lnet_peer_ping_failed(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
struct lnet_handle_md mdh;
int rc;
mdh = lp->lp_ping_mdh;
LNetInvalidateMDHandle(&lp->lp_ping_mdh);
lp->lp_state &= ~LNET_PEER_PING_FAILED;
lp->lp_state |= LNET_PEER_FORCE_PING;
rc = lp->lp_ping_error;
lp->lp_ping_error = 0;
spin_unlock(&lp->lp_lock);
if (!LNetMDHandleIsInvalid(mdh))
LNetMDUnlink(mdh);
CDEBUG(D_NET, "peer %s:%d\n",
libcfs_nidstr(&lp->lp_primary_nid), rc);
spin_lock(&lp->lp_lock);
return rc ? rc : LNET_REDISCOVER_PEER;
}
/* Active side of ping. */
static int lnet_peer_send_ping(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
int bytes;
int rc;
int cpt;
lp->lp_state |= LNET_PEER_PING_SENT;
lp->lp_state &= ~LNET_PEER_FORCE_PING;
spin_unlock(&lp->lp_lock);
cpt = lnet_net_lock_current();
/* Refcount for MD. */
lnet_peer_addref_locked(lp);
lnet_net_unlock(cpt);
bytes = max_t(int, lp->lp_data_bytes, LNET_PING_INFO_MIN_SIZE);
rc = lnet_send_ping(&lp->lp_primary_nid, &lp->lp_ping_mdh, bytes, lp,
the_lnet.ln_dc_handler, false);
/* if LNetMDBind in lnet_send_ping fails we need to decrement the
* refcount on the peer, otherwise LNetMDUnlink will be called
* which will eventually do that.
*/
if (rc > 0) {
lnet_net_lock(cpt);
lnet_peer_decref_locked(lp);
lnet_net_unlock(cpt);
rc = -rc; /* change the rc to negative value */
goto fail_error;
} else if (rc < 0) {
goto fail_error;
}
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
spin_lock(&lp->lp_lock);
return 0;
fail_error:
CDEBUG(D_NET, "peer %s: %d\n", libcfs_nidstr(&lp->lp_primary_nid), rc);
/*
* The errors that get us here are considered hard errors and
* cause Discovery to terminate. So we clear PING_SENT, but do
* not set either PING_FAILED or FORCE_PING. In fact we need
* to clear PING_FAILED, because the unlink event handler will
* have set it if we called LNetMDUnlink() above.
*/
spin_lock(&lp->lp_lock);
lp->lp_state &= ~(LNET_PEER_PING_SENT | LNET_PEER_PING_FAILED);
return rc;
}
/*
* This function exists because you cannot call LNetMDUnlink() from an
* event handler.
*/
static int lnet_peer_push_failed(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
struct lnet_handle_md mdh;
int rc;
mdh = lp->lp_push_mdh;
LNetInvalidateMDHandle(&lp->lp_push_mdh);
lp->lp_state &= ~LNET_PEER_PUSH_FAILED;
rc = lp->lp_push_error;
lp->lp_push_error = 0;
spin_unlock(&lp->lp_lock);
if (!LNetMDHandleIsInvalid(mdh))
LNetMDUnlink(mdh);
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
spin_lock(&lp->lp_lock);
return rc ? rc : LNET_REDISCOVER_PEER;
}
/*
* Mark the peer as discovered.
*/
static int lnet_peer_discovered(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
lp->lp_state |= LNET_PEER_DISCOVERED;
lp->lp_state &= ~(LNET_PEER_DISCOVERING |
LNET_PEER_REDISCOVER);
lp->lp_dc_error = 0;
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
return 0;
}
/* Active side of push. */
static int lnet_peer_send_push(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
struct lnet_ping_buffer *pbuf;
struct lnet_processid id;
struct lnet_md md = { NULL };
int cpt;
int rc;
/* Don't push to a non-multi-rail peer. */
if (!(lp->lp_state & LNET_PEER_MULTI_RAIL)) {
lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
/* if peer's NIDs are uptodate then peer is discovered */
if (lp->lp_state & LNET_PEER_NIDS_UPTODATE) {
rc = lnet_peer_discovered(lp);
return rc;
}
return 0;
}
lp->lp_state |= LNET_PEER_PUSH_SENT;
lp->lp_state &= ~LNET_PEER_FORCE_PUSH;
spin_unlock(&lp->lp_lock);
cpt = lnet_net_lock_current();
pbuf = the_lnet.ln_ping_target;
kref_get(&pbuf->pb_refcnt);
lnet_net_unlock(cpt);
/* Push source MD */
md.umd_start = &pbuf->pb_info;
md.umd_length = pbuf->pb_nbytes;
md.umd_threshold = 2; /* Put/Ack */
md.umd_max_size = 0;
md.umd_options = LNET_MD_TRACK_RESPONSE;
md.umd_handler = the_lnet.ln_dc_handler;
md.umd_user_ptr = lp;
rc = LNetMDBind(&md, LNET_UNLINK, &lp->lp_push_mdh);
if (rc) {
kref_put(&pbuf->pb_refcnt, lnet_ping_buffer_free);
CERROR("Can't bind push source MD: %d\n", rc);
goto fail_error;
}
cpt = lnet_net_lock_current();
/* Refcount for MD. */
lnet_peer_addref_locked(lp);
id.pid = LNET_PID_LUSTRE;
if (!LNET_NID_IS_ANY(&lp->lp_disc_dst_nid))
id.nid = lp->lp_disc_dst_nid;
else
id.nid = lp->lp_primary_nid;
lnet_net_unlock(cpt);
rc = LNetPut(&lp->lp_disc_src_nid, lp->lp_push_mdh,
LNET_ACK_REQ, &id, LNET_RESERVED_PORTAL,
LNET_PROTO_PING_MATCHBITS, 0, 0);
/*
* reset the discovery nid. There is no need to restrict sending
* from that source, if we call lnet_push_update_to_peers(). It'll
* get set to a specific NID, if we initiate discovery from the
* scratch
*/
lp->lp_disc_src_nid = LNET_ANY_NID;
lp->lp_disc_dst_nid = LNET_ANY_NID;
if (rc)
goto fail_unlink;
CDEBUG(D_NET, "peer %s\n", libcfs_nidstr(&lp->lp_primary_nid));
spin_lock(&lp->lp_lock);
return 0;
fail_unlink:
LNetMDUnlink(lp->lp_push_mdh);
LNetInvalidateMDHandle(&lp->lp_push_mdh);
fail_error:
CDEBUG(D_NET, "peer %s(%p): %d\n", libcfs_nidstr(&lp->lp_primary_nid),
lp, rc);
/*
* The errors that get us here are considered hard errors and
* cause Discovery to terminate. So we clear PUSH_SENT, but do
* not set PUSH_FAILED. In fact we need to clear PUSH_FAILED,
* because the unlink event handler will have set it if we
* called LNetMDUnlink() above.
*/
spin_lock(&lp->lp_lock);
lp->lp_state &= ~(LNET_PEER_PUSH_SENT | LNET_PEER_PUSH_FAILED);
return rc;
}
/*
* Wait for work to be queued or some other change that must be
* attended to. Returns non-zero if the discovery thread should shut
* down.
*/
static int lnet_peer_discovery_wait_for_work(void)
{
int cpt;
int rc = 0;
DEFINE_WAIT(wait);
cpt = lnet_net_lock_current();
for (;;) {
prepare_to_wait(&the_lnet.ln_dc_waitq, &wait,
TASK_INTERRUPTIBLE);
if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
break;
if (lnet_push_target_resize_needed() ||
the_lnet.ln_push_target->pb_needs_post)
break;
if (!list_empty(&the_lnet.ln_dc_request))
break;
if (!list_empty(&the_lnet.ln_msg_resend))
break;
lnet_net_unlock(cpt);
/*
* wakeup max every second to check if there are peers that
* have been stuck on the working queue for greater than
* the peer timeout.
*/
schedule_timeout(cfs_time_seconds(1));
finish_wait(&the_lnet.ln_dc_waitq, &wait);
cpt = lnet_net_lock_current();
}
finish_wait(&the_lnet.ln_dc_waitq, &wait);
if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
rc = -ESHUTDOWN;
lnet_net_unlock(cpt);
CDEBUG(D_NET, "woken: %d\n", rc);
return rc;
}
/*
* Messages that were pending on a destroyed peer will be put on a global
* resend list. The message resend list will be checked by
* the discovery thread when it wakes up, and will resend messages. These
* messages can still be sendable in the case the lpni which was the initial
* cause of the message re-queue was transfered to another peer.
*
* It is possible that LNet could be shutdown while we're iterating
* through the list. lnet_shudown_lndnets() will attempt to access the
* resend list, but will have to wait until the spinlock is released, by
* which time there shouldn't be any more messages on the resend list.
* During shutdown lnet_send() will fail and lnet_finalize() will be called
* for the messages so they can be released. The other case is that
* lnet_shudown_lndnets() can finalize all the messages before this
* function can visit the resend list, in which case this function will be
* a no-op.
*/
static void lnet_resend_msgs(void)
{
struct lnet_msg *msg, *tmp;
LIST_HEAD(resend);
int rc;
spin_lock(&the_lnet.ln_msg_resend_lock);
list_splice(&the_lnet.ln_msg_resend, &resend);
spin_unlock(&the_lnet.ln_msg_resend_lock);
list_for_each_entry_safe(msg, tmp, &resend, msg_list) {
list_del_init(&msg->msg_list);
rc = lnet_send(&msg->msg_src_nid_param, msg,
&msg->msg_rtr_nid_param);
if (rc < 0) {
CNETERR("Error sending %s to %s: %d\n",
lnet_msgtyp2str(msg->msg_type),
libcfs_idstr(&msg->msg_target), rc);
lnet_finalize(msg, rc);
}
}
}
/* The discovery thread. */
static int lnet_peer_discovery(void *arg)
{
struct lnet_peer *lp;
int rc;
wait_for_completion(&the_lnet.ln_started);
CDEBUG(D_NET, "started\n");
for (;;) {
if (lnet_peer_discovery_wait_for_work())
break;
if (lnet_push_target_resize_needed())
lnet_push_target_resize();
else if (the_lnet.ln_push_target->pb_needs_post)
lnet_push_target_post(the_lnet.ln_push_target,
&the_lnet.ln_push_target_md);
lnet_resend_msgs();
lnet_net_lock(LNET_LOCK_EX);
if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING) {
lnet_net_unlock(LNET_LOCK_EX);
break;
}
/*
* Process all incoming discovery work requests. When
* discovery must wait on a peer to change state, it
* is added to the tail of the ln_dc_working queue. A
* timestamp keeps track of when the peer was added,
* so we can time out discovery requests that take too
* long.
*/
while (!list_empty(&the_lnet.ln_dc_request)) {
lp = list_first_entry(&the_lnet.ln_dc_request,
struct lnet_peer, lp_dc_list);
list_move(&lp->lp_dc_list, &the_lnet.ln_dc_working);
/*
* set the time the peer was put on the dc_working
* queue. It shouldn't remain on the queue
* forever, in case the GET message (for ping)
* doesn't get a REPLY or the PUT message (for
* push) doesn't get an ACK.
*/
lp->lp_last_queued = ktime_get_real_seconds();
lnet_net_unlock(LNET_LOCK_EX);
if (lnet_push_target_resize_needed())
lnet_push_target_resize();
else if (the_lnet.ln_push_target->pb_needs_post)
lnet_push_target_post(the_lnet.ln_push_target,
&the_lnet.ln_push_target_md);
/*
* Select an action depending on the state of
* the peer and whether discovery is disabled.
* The check whether discovery is disabled is
* done after the code that handles processing
* for arrived data, cleanup for failures, and
* forcing a Ping or Push.
*/
spin_lock(&lp->lp_lock);
CDEBUG(D_NET, "peer %s(%p) state %#x\n",
libcfs_nidstr(&lp->lp_primary_nid), lp,
lp->lp_state);
if (lp->lp_state & (LNET_PEER_MARK_DELETION |
LNET_PEER_MARK_DELETED))
rc = lnet_peer_deletion(lp);
else if (lp->lp_state & LNET_PEER_DATA_PRESENT)
rc = lnet_peer_data_present(lp);
else if (lp->lp_state & LNET_PEER_PING_FAILED)
rc = lnet_peer_ping_failed(lp);
else if (lp->lp_state & LNET_PEER_PUSH_FAILED)
rc = lnet_peer_push_failed(lp);
else if (lnet_peer_needs_ping(lp))
rc = lnet_peer_send_ping(lp);
else if (lnet_peer_needs_push(lp))
rc = lnet_peer_send_push(lp);
else
rc = lnet_peer_discovered(lp);
CDEBUG(D_NET, "peer %s(%p) state %#x rc %d\n",
libcfs_nidstr(&lp->lp_primary_nid), lp,
lp->lp_state, rc);
if (rc == LNET_REDISCOVER_PEER) {
spin_unlock(&lp->lp_lock);
lnet_net_lock(LNET_LOCK_EX);
list_move(&lp->lp_dc_list,
&the_lnet.ln_dc_request);
} else if (rc ||
!(lp->lp_state & LNET_PEER_DISCOVERING)) {
spin_unlock(&lp->lp_lock);
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_discovery_complete(lp, rc);
} else {
spin_unlock(&lp->lp_lock);
lnet_net_lock(LNET_LOCK_EX);
}
if (the_lnet.ln_dc_state == LNET_DC_STATE_STOPPING)
break;
}
lnet_net_unlock(LNET_LOCK_EX);
}
CDEBUG(D_NET, "stopping\n");
/*
* Clean up before telling lnet_peer_discovery_stop() that
* we're done. Use wake_up() below to somewhat reduce the
* size of the thundering herd if there are multiple threads
* waiting on discovery of a single peer.
*/
/* Queue cleanup 1: stop all pending pings and pushes. */
lnet_net_lock(LNET_LOCK_EX);
while (!list_empty(&the_lnet.ln_dc_working)) {
lp = list_first_entry(&the_lnet.ln_dc_working,
struct lnet_peer, lp_dc_list);
list_move(&lp->lp_dc_list, &the_lnet.ln_dc_expired);
lnet_net_unlock(LNET_LOCK_EX);
lnet_peer_cancel_discovery(lp);
lnet_net_lock(LNET_LOCK_EX);
}
lnet_net_unlock(LNET_LOCK_EX);
/* Queue cleanup 2: wait for the expired queue to clear. */
while (!list_empty(&the_lnet.ln_dc_expired))
schedule_timeout_uninterruptible(cfs_time_seconds(1));
/* Queue cleanup 3: clear the request queue. */
lnet_net_lock(LNET_LOCK_EX);
while (!list_empty(&the_lnet.ln_dc_request)) {
lp = list_first_entry(&the_lnet.ln_dc_request,
struct lnet_peer, lp_dc_list);
lnet_net_unlock(LNET_LOCK_EX);
spin_lock(&lp->lp_lock);
if (lp->lp_state & LNET_PEER_PING_FAILED)
(void)lnet_peer_ping_failed(lp);
if (lp->lp_state & LNET_PEER_PUSH_FAILED)
(void)lnet_peer_push_failed(lp);
spin_unlock(&lp->lp_lock);
lnet_net_lock(LNET_LOCK_EX);
lnet_peer_discovery_complete(lp, -ESHUTDOWN);
}
lnet_net_unlock(LNET_LOCK_EX);
the_lnet.ln_dc_handler = NULL;
the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
wake_up(&the_lnet.ln_dc_waitq);
CDEBUG(D_NET, "stopped\n");
return 0;
}
/* ln_api_mutex is held on entry. */
int lnet_peer_discovery_start(void)
{
struct task_struct *task;
int rc = 0;
if (the_lnet.ln_dc_state != LNET_DC_STATE_SHUTDOWN)
return -EALREADY;
the_lnet.ln_dc_handler = lnet_discovery_event_handler;
the_lnet.ln_dc_state = LNET_DC_STATE_RUNNING;
task = kthread_run(lnet_peer_discovery, NULL, "lnet_discovery");
if (IS_ERR(task)) {
rc = PTR_ERR(task);
CERROR("Can't start peer discovery thread: %d\n", rc);
the_lnet.ln_dc_handler = NULL;
the_lnet.ln_dc_state = LNET_DC_STATE_SHUTDOWN;
}
CDEBUG(D_NET, "discovery start: %d\n", rc);
return rc;
}
/* ln_api_mutex is held on entry. */
void lnet_peer_discovery_stop(void)
{
if (the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN)
return;
LASSERT(the_lnet.ln_dc_state == LNET_DC_STATE_RUNNING);
the_lnet.ln_dc_state = LNET_DC_STATE_STOPPING;
/* In the LNetNIInit() path we may be stopping discovery before it
* entered its work loop
*/
if (!completion_done(&the_lnet.ln_started))
complete(&the_lnet.ln_started);
else
wake_up(&the_lnet.ln_dc_waitq);
mutex_unlock(&the_lnet.ln_api_mutex);
wait_event(the_lnet.ln_dc_waitq,
the_lnet.ln_dc_state == LNET_DC_STATE_SHUTDOWN);
mutex_lock(&the_lnet.ln_api_mutex);
LASSERT(list_empty(&the_lnet.ln_dc_request));
LASSERT(list_empty(&the_lnet.ln_dc_working));
LASSERT(list_empty(&the_lnet.ln_dc_expired));
CDEBUG(D_NET, "discovery stopped\n");
}
/* Debugging */
void
lnet_debug_peer(struct lnet_nid *nid)
{
char *aliveness = "NA";
struct lnet_peer_ni *lp;
int cpt;
cpt = lnet_nid2cpt(nid, NULL);
lnet_net_lock(cpt);
lp = lnet_peerni_by_nid_locked(nid, NULL, cpt);
if (IS_ERR(lp)) {
lnet_net_unlock(cpt);
CDEBUG(D_WARNING, "No peer %s\n", libcfs_nidstr(nid));
return;
}
if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp))
aliveness = (lnet_is_peer_ni_alive(lp)) ? "up" : "down";
CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n",
libcfs_nidstr(&lp->lpni_nid), kref_read(&lp->lpni_kref),
aliveness, lp->lpni_net->net_tunables.lct_peer_tx_credits,
lp->lpni_rtrcredits, lp->lpni_minrtrcredits,
lp->lpni_txcredits, lp->lpni_mintxcredits, lp->lpni_txqnob);
lnet_peer_ni_decref_locked(lp);
lnet_net_unlock(cpt);
}
/* Gathering information for userspace. */
int lnet_get_peer_ni_info(__u32 peer_index, __u64 *nid,
char aliveness[LNET_MAX_STR_LEN],
__u32 *cpt_iter, __u32 *refcount,
__u32 *ni_peer_tx_credits, __u32 *peer_tx_credits,
__u32 *peer_rtr_credits, __u32 *peer_min_rtr_credits,
__u32 *peer_tx_qnob)
{
struct lnet_peer_table *peer_table;
struct lnet_peer_ni *lp;
int j;
int lncpt;
bool found = false;
/* get the number of CPTs */
lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
/* if the cpt number to be examined is >= the number of cpts in
* the system then indicate that there are no more cpts to examin
*/
if (*cpt_iter >= lncpt)
return -ENOENT;
/* get the current table */
peer_table = the_lnet.ln_peer_tables[*cpt_iter];
/* if the ptable is NULL then there are no more cpts to examine */
if (peer_table == NULL)
return -ENOENT;
lnet_net_lock(*cpt_iter);
for (j = 0; j < LNET_PEER_HASH_SIZE && !found; j++) {
struct list_head *peers = &peer_table->pt_hash[j];
list_for_each_entry(lp, peers, lpni_hashlist) {
if (!nid_is_nid4(&lp->lpni_nid))
continue;
if (peer_index-- > 0)
continue;
snprintf(aliveness, LNET_MAX_STR_LEN, "NA");
if (lnet_isrouter(lp) ||
lnet_peer_aliveness_enabled(lp))
snprintf(aliveness, LNET_MAX_STR_LEN,
lnet_is_peer_ni_alive(lp) ? "up" : "down");
*nid = lnet_nid_to_nid4(&lp->lpni_nid);
*refcount = kref_read(&lp->lpni_kref);
*ni_peer_tx_credits =
lp->lpni_net->net_tunables.lct_peer_tx_credits;
*peer_tx_credits = lp->lpni_txcredits;
*peer_rtr_credits = lp->lpni_rtrcredits;
*peer_min_rtr_credits = lp->lpni_mintxcredits;
*peer_tx_qnob = lp->lpni_txqnob;
found = true;
}
}
lnet_net_unlock(*cpt_iter);
*cpt_iter = lncpt;
return found ? 0 : -ENOENT;
}
/* ln_api_mutex is held, which keeps the peer list stable */
int lnet_get_peer_info(struct lnet_ioctl_peer_cfg *cfg, void __user *bulk)
{
struct lnet_ioctl_element_stats *lpni_stats;
struct lnet_ioctl_element_msg_stats *lpni_msg_stats;
struct lnet_ioctl_peer_ni_hstats *lpni_hstats;
struct lnet_peer_ni_credit_info *lpni_info;
struct lnet_peer_ni *lpni;
struct lnet_peer *lp;
lnet_nid_t nid4;
struct lnet_nid nid;
__u32 size;
int rc;
lnet_nid4_to_nid(cfg->prcfg_prim_nid, &nid);
lp = lnet_find_peer(&nid);
if (!lp) {
rc = -ENOENT;
goto out;
}
size = sizeof(nid4) + sizeof(*lpni_info) + sizeof(*lpni_stats)
+ sizeof(*lpni_msg_stats) + sizeof(*lpni_hstats);
size *= lp->lp_nnis;
if (size > cfg->prcfg_size) {
cfg->prcfg_size = size;
rc = -E2BIG;
goto out_lp_decref;
}
cfg->prcfg_prim_nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
cfg->prcfg_mr = lnet_peer_is_multi_rail(lp);
cfg->prcfg_cfg_nid = lnet_nid_to_nid4(&lp->lp_primary_nid);
cfg->prcfg_count = lp->lp_nnis;
cfg->prcfg_size = size;
cfg->prcfg_state = lp->lp_state;
/* Allocate helper buffers. */
rc = -ENOMEM;
LIBCFS_ALLOC(lpni_info, sizeof(*lpni_info));
if (!lpni_info)
goto out_lp_decref;
LIBCFS_ALLOC(lpni_stats, sizeof(*lpni_stats));
if (!lpni_stats)
goto out_free_info;
LIBCFS_ALLOC(lpni_msg_stats, sizeof(*lpni_msg_stats));
if (!lpni_msg_stats)
goto out_free_stats;
LIBCFS_ALLOC(lpni_hstats, sizeof(*lpni_hstats));
if (!lpni_hstats)
goto out_free_msg_stats;
lpni = NULL;
rc = -EFAULT;
while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) {
if (!nid_is_nid4(&lpni->lpni_nid))
continue;
nid4 = lnet_nid_to_nid4(&lpni->lpni_nid);
if (copy_to_user(bulk, &nid4, sizeof(nid4)))
goto out_free_hstats;
bulk += sizeof(nid4);
memset(lpni_info, 0, sizeof(*lpni_info));
snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN, "NA");
if (lnet_isrouter(lpni) ||
lnet_peer_aliveness_enabled(lpni))
snprintf(lpni_info->cr_aliveness, LNET_MAX_STR_LEN,
lnet_is_peer_ni_alive(lpni) ? "up" : "down");
lpni_info->cr_refcount = kref_read(&lpni->lpni_kref);
lpni_info->cr_ni_peer_tx_credits = (lpni->lpni_net != NULL) ?
lpni->lpni_net->net_tunables.lct_peer_tx_credits : 0;
lpni_info->cr_peer_tx_credits = lpni->lpni_txcredits;
lpni_info->cr_peer_rtr_credits = lpni->lpni_rtrcredits;
lpni_info->cr_peer_min_rtr_credits = lpni->lpni_minrtrcredits;
lpni_info->cr_peer_min_tx_credits = lpni->lpni_mintxcredits;
lpni_info->cr_peer_tx_qnob = lpni->lpni_txqnob;
if (copy_to_user(bulk, lpni_info, sizeof(*lpni_info)))
goto out_free_hstats;
bulk += sizeof(*lpni_info);
memset(lpni_stats, 0, sizeof(*lpni_stats));
lpni_stats->iel_send_count = lnet_sum_stats(&lpni->lpni_stats,
LNET_STATS_TYPE_SEND);
lpni_stats->iel_recv_count = lnet_sum_stats(&lpni->lpni_stats,
LNET_STATS_TYPE_RECV);
lpni_stats->iel_drop_count = lnet_sum_stats(&lpni->lpni_stats,
LNET_STATS_TYPE_DROP);
if (copy_to_user(bulk, lpni_stats, sizeof(*lpni_stats)))
goto out_free_hstats;
bulk += sizeof(*lpni_stats);
lnet_usr_translate_stats(lpni_msg_stats, &lpni->lpni_stats);
if (copy_to_user(bulk, lpni_msg_stats, sizeof(*lpni_msg_stats)))
goto out_free_hstats;
bulk += sizeof(*lpni_msg_stats);
lpni_hstats->hlpni_network_timeout =
atomic_read(&lpni->lpni_hstats.hlt_network_timeout);
lpni_hstats->hlpni_remote_dropped =
atomic_read(&lpni->lpni_hstats.hlt_remote_dropped);
lpni_hstats->hlpni_remote_timeout =
atomic_read(&lpni->lpni_hstats.hlt_remote_timeout);
lpni_hstats->hlpni_remote_error =
atomic_read(&lpni->lpni_hstats.hlt_remote_error);
lpni_hstats->hlpni_health_value =
atomic_read(&lpni->lpni_healthv);
lpni_hstats->hlpni_ping_count = lpni->lpni_ping_count;
lpni_hstats->hlpni_next_ping = lpni->lpni_next_ping;
if (copy_to_user(bulk, lpni_hstats, sizeof(*lpni_hstats)))
goto out_free_hstats;
bulk += sizeof(*lpni_hstats);
}
rc = 0;
out_free_hstats:
LIBCFS_FREE(lpni_hstats, sizeof(*lpni_hstats));
out_free_msg_stats:
LIBCFS_FREE(lpni_msg_stats, sizeof(*lpni_msg_stats));
out_free_stats:
LIBCFS_FREE(lpni_stats, sizeof(*lpni_stats));
out_free_info:
LIBCFS_FREE(lpni_info, sizeof(*lpni_info));
out_lp_decref:
lnet_peer_decref_locked(lp);
out:
return rc;
}
/* must hold net_lock/0 */
void
lnet_peer_ni_add_to_recoveryq_locked(struct lnet_peer_ni *lpni,
struct list_head *recovery_queue,
time64_t now)
{
/* the mt could've shutdown and cleaned up the queues */
if (the_lnet.ln_mt_state != LNET_MT_STATE_RUNNING)
return;
if (!list_empty(&lpni->lpni_recovery))
return;
if (atomic_read(&lpni->lpni_healthv) == LNET_MAX_HEALTH_VALUE)
return;
if (!lpni->lpni_last_alive) {
CDEBUG(D_NET,
"lpni %s(%p) not eligible for recovery last alive %lld\n",
libcfs_nidstr(&lpni->lpni_nid), lpni,
lpni->lpni_last_alive);
return;
}
if (lnet_recovery_limit &&
now > lpni->lpni_last_alive + lnet_recovery_limit) {
CDEBUG(D_NET, "lpni %s aged out last alive %lld\n",
libcfs_nidstr(&lpni->lpni_nid),
lpni->lpni_last_alive);
/* Reset the ping count so that if this peer NI is added back to
* the recovery queue we will send the first ping right away.
*/
lpni->lpni_ping_count = 0;
return;
}
/* This peer NI is going on the recovery queue, so take a ref on it */
kref_get(&lpni->lpni_kref);
lnet_peer_ni_set_next_ping(lpni, now);
CDEBUG(D_NET, "%s added to recovery queue. ping count: %u next ping: %lld last alive: %lld health: %d\n",
libcfs_nidstr(&lpni->lpni_nid),
lpni->lpni_ping_count,
lpni->lpni_next_ping,
lpni->lpni_last_alive,
atomic_read(&lpni->lpni_healthv));
list_add_tail(&lpni->lpni_recovery, recovery_queue);
}
/* Call with the ln_api_mutex held */
void
lnet_peer_ni_set_healthv(struct lnet_nid *nid, int value, bool all)
{
struct lnet_peer_table *ptable;
struct lnet_peer *lp;
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
int lncpt;
int cpt;
time64_t now;
if (the_lnet.ln_state != LNET_STATE_RUNNING)
return;
now = ktime_get_seconds();
if (!all) {
lnet_net_lock(LNET_LOCK_EX);
lpni = lnet_peer_ni_find_locked(nid);
if (!lpni) {
lnet_net_unlock(LNET_LOCK_EX);
return;
}
lnet_set_lpni_healthv_locked(lpni, value);
lnet_peer_ni_add_to_recoveryq_locked(lpni,
&the_lnet.ln_mt_peerNIRecovq, now);
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
return;
}
lncpt = cfs_percpt_number(the_lnet.ln_peer_tables);
/*
* Walk all the peers and reset the health value for each one to the
* specified value.
*/
lnet_net_lock(LNET_LOCK_EX);
for (cpt = 0; cpt < lncpt; cpt++) {
ptable = the_lnet.ln_peer_tables[cpt];
list_for_each_entry(lp, &ptable->pt_peer_list, lp_peer_list) {
list_for_each_entry(lpn, &lp->lp_peer_nets, lpn_peer_nets) {
list_for_each_entry(lpni, &lpn->lpn_peer_nis,
lpni_peer_nis) {
lnet_set_lpni_healthv_locked(lpni,
value);
lnet_peer_ni_add_to_recoveryq_locked(lpni,
&the_lnet.ln_mt_peerNIRecovq, now);
}
}
}
}
lnet_net_unlock(LNET_LOCK_EX);
}
