/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#define DEBUG_SUBSYSTEM S_LNET
#include <lnet/lib-lnet.h>
+#include <lnet/lib-dlc.h>
int
lnet_peer_tables_create(void)
{
struct lnet_peer_table *ptable;
- cfs_list_t *hash;
+ struct list_head *hash;
int i;
int j;
}
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
- CFS_INIT_LIST_HEAD(&ptable->pt_deathrow);
+ INIT_LIST_HEAD(&ptable->pt_deathrow);
LIBCFS_CPT_ALLOC(hash, lnet_cpt_table(), i,
LNET_PEER_HASH_SIZE * sizeof(*hash));
}
for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
- CFS_INIT_LIST_HEAD(&hash[j]);
+ INIT_LIST_HEAD(&hash[j]);
ptable->pt_hash = hash; /* sign of initialization */
}
lnet_peer_tables_destroy(void)
{
struct lnet_peer_table *ptable;
- cfs_list_t *hash;
+ struct list_head *hash;
int i;
int j;
if (hash == NULL) /* not intialized */
break;
- LASSERT(cfs_list_empty(&ptable->pt_deathrow));
+ LASSERT(list_empty(&ptable->pt_deathrow));
ptable->pt_hash = NULL;
for (j = 0; j < LNET_PEER_HASH_SIZE; j++)
- LASSERT(cfs_list_empty(&hash[j]));
+ LASSERT(list_empty(&hash[j]));
LIBCFS_FREE(hash, LNET_PEER_HASH_SIZE * sizeof(*hash));
}
the_lnet.ln_peer_tables = NULL;
}
+static void
+lnet_peer_table_cleanup_locked(lnet_ni_t *ni, struct lnet_peer_table *ptable)
+{
+ int i;
+ lnet_peer_t *lp;
+ lnet_peer_t *tmp;
+
+ for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
+ list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
+ lp_hashlist) {
+ if (ni != NULL && ni != lp->lp_ni)
+ continue;
+ list_del_init(&lp->lp_hashlist);
+ /* Lose hash table's ref */
+ ptable->pt_zombies++;
+ lnet_peer_decref_locked(lp);
+ }
+ }
+}
+
+static void
+lnet_peer_table_deathrow_wait_locked(struct lnet_peer_table *ptable,
+ int cpt_locked)
+{
+ int i;
+
+ for (i = 3; ptable->pt_zombies != 0; i++) {
+ lnet_net_unlock(cpt_locked);
+
+ if (IS_PO2(i)) {
+ CDEBUG(D_WARNING,
+ "Waiting for %d zombies on peer table\n",
+ ptable->pt_zombies);
+ }
+ cfs_pause(cfs_time_seconds(1) >> 1);
+ lnet_net_lock(cpt_locked);
+ }
+}
+
+static void
+lnet_peer_table_del_rtrs_locked(lnet_ni_t *ni, struct lnet_peer_table *ptable,
+ int cpt_locked)
+{
+ lnet_peer_t *lp;
+ lnet_peer_t *tmp;
+ lnet_nid_t lp_nid;
+ int i;
+
+ for (i = 0; i < LNET_PEER_HASH_SIZE; i++) {
+ list_for_each_entry_safe(lp, tmp, &ptable->pt_hash[i],
+ lp_hashlist) {
+ if (ni != lp->lp_ni)
+ continue;
+
+ if (lp->lp_rtr_refcount == 0)
+ continue;
+
+ lp_nid = lp->lp_nid;
+
+ lnet_net_unlock(cpt_locked);
+ lnet_del_route(LNET_NIDNET(LNET_NID_ANY), lp_nid);
+ lnet_net_lock(cpt_locked);
+ }
+ }
+}
+
void
-lnet_peer_tables_cleanup(void)
+lnet_peer_tables_cleanup(lnet_ni_t *ni)
{
- struct lnet_peer_table *ptable;
int i;
- int j;
+ struct lnet_peer_table *ptable;
+ lnet_peer_t *lp;
+ struct list_head deathrow;
- LASSERT(the_lnet.ln_shutdown); /* i.e. no new peers */
+ INIT_LIST_HEAD(&deathrow);
+ LASSERT(the_lnet.ln_shutdown || ni != 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(i);
-
- for (j = 0; j < LNET_PEER_HASH_SIZE; j++) {
- cfs_list_t *peers = &ptable->pt_hash[j];
-
- while (!cfs_list_empty(peers)) {
- lnet_peer_t *lp = cfs_list_entry(peers->next,
- lnet_peer_t,
- lp_hashlist);
- cfs_list_del_init(&lp->lp_hashlist);
- /* lose hash table's ref */
- lnet_peer_decref_locked(lp);
- }
- }
-
+ lnet_peer_table_del_rtrs_locked(ni, ptable, i);
lnet_net_unlock(i);
}
+ /* Start the process of moving the applicable peers to
+ * deathrow. */
cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
- CFS_LIST_HEAD (deathrow);
- lnet_peer_t *lp;
-
lnet_net_lock(i);
+ lnet_peer_table_cleanup_locked(ni, ptable);
+ lnet_net_unlock(i);
+ }
- for (j = 3; ptable->pt_number != 0; j++) {
- lnet_net_unlock(i);
-
- if ((j & (j - 1)) == 0) {
- CDEBUG(D_WARNING,
- "Waiting for %d peers on peer table\n",
- ptable->pt_number);
- }
- cfs_pause(cfs_time_seconds(1) / 2);
- lnet_net_lock(i);
- }
- cfs_list_splice_init(&ptable->pt_deathrow, &deathrow);
-
+ /* Cleanup all entries on deathrow. */
+ cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) {
+ lnet_net_lock(i);
+ lnet_peer_table_deathrow_wait_locked(ptable, i);
+ list_splice_init(&ptable->pt_deathrow, &deathrow);
lnet_net_unlock(i);
+ }
- while (!cfs_list_empty(&deathrow)) {
- lp = cfs_list_entry(deathrow.next,
- lnet_peer_t, lp_hashlist);
- cfs_list_del(&lp->lp_hashlist);
- LIBCFS_FREE(lp, sizeof(*lp));
- }
+ while (!list_empty(&deathrow)) {
+ lp = list_entry(deathrow.next, lnet_peer_t, lp_hashlist);
+ list_del(&lp->lp_hashlist);
+ LIBCFS_FREE(lp, sizeof(*lp));
}
}
LASSERT(lp->lp_refcount == 0);
LASSERT(lp->lp_rtr_refcount == 0);
- LASSERT(cfs_list_empty(&lp->lp_txq));
- LASSERT(cfs_list_empty(&lp->lp_hashlist));
+ LASSERT(list_empty(&lp->lp_txq));
+ LASSERT(list_empty(&lp->lp_hashlist));
LASSERT(lp->lp_txqnob == 0);
ptable = the_lnet.ln_peer_tables[lp->lp_cpt];
lnet_ni_decref_locked(lp->lp_ni, lp->lp_cpt);
lp->lp_ni = NULL;
- cfs_list_add(&lp->lp_hashlist, &ptable->pt_deathrow);
+ list_add(&lp->lp_hashlist, &ptable->pt_deathrow);
+ LASSERT(ptable->pt_zombies > 0);
+ ptable->pt_zombies--;
}
lnet_peer_t *
lnet_find_peer_locked(struct lnet_peer_table *ptable, lnet_nid_t nid)
{
- cfs_list_t *peers;
- lnet_peer_t *lp;
+ struct list_head *peers;
+ lnet_peer_t *lp;
- if (the_lnet.ln_shutdown)
- return NULL;
+ LASSERT(!the_lnet.ln_shutdown);
peers = &ptable->pt_hash[lnet_nid2peerhash(nid)];
- cfs_list_for_each_entry(lp, peers, lp_hashlist) {
+ list_for_each_entry(lp, peers, lp_hashlist) {
if (lp->lp_nid == nid) {
lnet_peer_addref_locked(lp);
return lp;
lnet_peer_t *lp = NULL;
lnet_peer_t *lp2;
int cpt2;
+ int rc = 0;
+
+ *lpp = NULL;
+ if (the_lnet.ln_shutdown) /* it's shutting down */
+ return -ESHUTDOWN;
/* cpt can be LNET_LOCK_EX if it's called from router functions */
cpt2 = cpt != LNET_LOCK_EX ? cpt : lnet_cpt_of_nid_locked(nid);
ptable = the_lnet.ln_peer_tables[cpt2];
lp = lnet_find_peer_locked(ptable, nid);
- if (lp != NULL) {
- *lpp = lp;
- return 0;
- }
+ if (lp != NULL) {
+ *lpp = lp;
+ return 0;
+ }
- if (!cfs_list_empty(&ptable->pt_deathrow)) {
- lp = cfs_list_entry(ptable->pt_deathrow.next,
- lnet_peer_t, lp_hashlist);
- cfs_list_del(&lp->lp_hashlist);
+ if (!list_empty(&ptable->pt_deathrow)) {
+ lp = list_entry(ptable->pt_deathrow.next,
+ lnet_peer_t, lp_hashlist);
+ list_del(&lp->lp_hashlist);
}
+ /*
+ * take extra refcount in case another thread has shutdown LNet
+ * and destroyed locks and peer-table before I finish the allocation
+ */
+ ptable->pt_number++;
lnet_net_unlock(cpt);
if (lp != NULL)
LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), cpt2, sizeof(*lp));
if (lp == NULL) {
- *lpp = NULL;
- LNET_LOCK();
- return -ENOMEM;
- }
+ rc = -ENOMEM;
+ lnet_net_lock(cpt);
+ goto out;
+ }
- CFS_INIT_LIST_HEAD(&lp->lp_txq);
- CFS_INIT_LIST_HEAD(&lp->lp_rtrq);
- CFS_INIT_LIST_HEAD(&lp->lp_routes);
+ INIT_LIST_HEAD(&lp->lp_txq);
+ INIT_LIST_HEAD(&lp->lp_rtrq);
+ INIT_LIST_HEAD(&lp->lp_routes);
lp->lp_notify = 0;
lp->lp_notifylnd = 0;
lp->lp_ping_feats = LNET_PING_FEAT_INVAL;
lp->lp_nid = nid;
lp->lp_cpt = cpt2;
- lp->lp_refcount = 2; /* 1 for caller; 1 for hash */
+ lp->lp_refcount = 2; /* 1 for caller; 1 for hash */
lp->lp_rtr_refcount = 0;
lnet_net_lock(cpt);
+ if (the_lnet.ln_shutdown) {
+ rc = -ESHUTDOWN;
+ goto out;
+ }
+
lp2 = lnet_find_peer_locked(ptable, nid);
if (lp2 != NULL) {
- cfs_list_add(&lp->lp_hashlist, &ptable->pt_deathrow);
-
- if (the_lnet.ln_shutdown) {
- lnet_peer_decref_locked(lp2);
- *lpp = NULL;
- return -ESHUTDOWN;
- }
-
- *lpp = lp2;
- return 0;
- }
+ *lpp = lp2;
+ goto out;
+ }
lp->lp_ni = lnet_net2ni_locked(LNET_NIDNET(nid), cpt2);
if (lp->lp_ni == NULL) {
- cfs_list_add(&lp->lp_hashlist, &ptable->pt_deathrow);
-
- *lpp = NULL;
- return the_lnet.ln_shutdown ? -ESHUTDOWN : -EHOSTUNREACH;
- }
-
- lp->lp_txcredits =
- lp->lp_mintxcredits = lp->lp_ni->ni_peertxcredits;
- lp->lp_rtrcredits =
- lp->lp_minrtrcredits = lnet_peer_buffer_credits(lp->lp_ni);
+ rc = -EHOSTUNREACH;
+ goto out;
+ }
- /* can't add peers after shutdown starts */
- LASSERT (!the_lnet.ln_shutdown);
+ lp->lp_txcredits =
+ lp->lp_mintxcredits = lp->lp_ni->ni_peertxcredits;
+ lp->lp_rtrcredits =
+ lp->lp_minrtrcredits = lnet_peer_buffer_credits(lp->lp_ni);
- cfs_list_add_tail(&lp->lp_hashlist,
- &ptable->pt_hash[lnet_nid2peerhash(nid)]);
+ list_add_tail(&lp->lp_hashlist,
+ &ptable->pt_hash[lnet_nid2peerhash(nid)]);
ptable->pt_version++;
- ptable->pt_number++;
-
*lpp = lp;
+
return 0;
+out:
+ if (lp != NULL)
+ list_add(&lp->lp_hashlist, &ptable->pt_deathrow);
+ ptable->pt_number--;
+ return rc;
}
void
lnet_net_unlock(cpt);
}
+
+int lnet_get_peer_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;
+ lnet_peer_t *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, lp_hashlist) {
+ 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,
+ lp->lp_alive ? "up" : "down");
+
+ *nid = lp->lp_nid;
+ *refcount = lp->lp_refcount;
+ *ni_peer_tx_credits = lp->lp_ni->ni_peertxcredits;
+ *peer_tx_credits = lp->lp_txcredits;
+ *peer_rtr_credits = lp->lp_rtrcredits;
+ *peer_min_rtr_credits = lp->lp_mintxcredits;
+ *peer_tx_qnob = lp->lp_txqnob;
+
+ found = true;
+ }
+
+ }
+ lnet_net_unlock(*cpt_iter);
+
+ *cpt_iter = lncpt;
+
+ return found ? 0 : -ENOENT;
+}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff