diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/lnet/peer.c')
-rw-r--r-- | drivers/staging/lustre/lnet/lnet/peer.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/lnet/peer.c b/drivers/staging/lustre/lnet/lnet/peer.c new file mode 100644 index 000000000000..286977691393 --- /dev/null +++ b/drivers/staging/lustre/lnet/lnet/peer.c @@ -0,0 +1,337 @@ +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + * GPL HEADER END + */ +/* + * 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/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lnet/lnet/peer.c + */ + +#define DEBUG_SUBSYSTEM S_LNET + +#include <linux/lnet/lib-lnet.h> + +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) { + INIT_LIST_HEAD(&ptable->pt_deathrow); + + 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; + } + + for (j = 0; j < LNET_PEER_HASH_SIZE; j++) + INIT_LIST_HEAD(&hash[j]); + ptable->pt_hash = hash; /* sign of initialization */ + } + + return 0; +} + +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 == NULL) + return; + + cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) { + hash = ptable->pt_hash; + if (hash == NULL) /* not intialized */ + break; + + LASSERT(list_empty(&ptable->pt_deathrow)); + + ptable->pt_hash = NULL; + for (j = 0; j < LNET_PEER_HASH_SIZE; j++) + LASSERT(list_empty(&hash[j])); + + LIBCFS_FREE(hash, LNET_PEER_HASH_SIZE * sizeof(*hash)); + } + + cfs_percpt_free(the_lnet.ln_peer_tables); + the_lnet.ln_peer_tables = NULL; +} + +void +lnet_peer_tables_cleanup(void) +{ + struct lnet_peer_table *ptable; + int i; + int j; + + LASSERT(the_lnet.ln_shutdown); /* i.e. no new peers */ + + cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) { + lnet_net_lock(i); + + for (j = 0; j < LNET_PEER_HASH_SIZE; j++) { + struct list_head *peers = &ptable->pt_hash[j]; + + while (!list_empty(peers)) { + lnet_peer_t *lp = list_entry(peers->next, + lnet_peer_t, + lp_hashlist); + list_del_init(&lp->lp_hashlist); + /* lose hash table's ref */ + lnet_peer_decref_locked(lp); + } + } + + lnet_net_unlock(i); + } + + cfs_percpt_for_each(ptable, i, the_lnet.ln_peer_tables) { + LIST_HEAD (deathrow); + lnet_peer_t *lp; + + lnet_net_lock(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); + } + list_splice_init(&ptable->pt_deathrow, &deathrow); + + lnet_net_unlock(i); + + while (!list_empty(&deathrow)) { + lp = list_entry(deathrow.next, + lnet_peer_t, lp_hashlist); + list_del(&lp->lp_hashlist); + LIBCFS_FREE(lp, sizeof(*lp)); + } + } +} + +void +lnet_destroy_peer_locked(lnet_peer_t *lp) +{ + struct lnet_peer_table *ptable; + + LASSERT(lp->lp_refcount == 0); + LASSERT(lp->lp_rtr_refcount == 0); + 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]; + LASSERT(ptable->pt_number > 0); + ptable->pt_number--; + + lnet_ni_decref_locked(lp->lp_ni, lp->lp_cpt); + lp->lp_ni = NULL; + + list_add(&lp->lp_hashlist, &ptable->pt_deathrow); +} + +lnet_peer_t * +lnet_find_peer_locked(struct lnet_peer_table *ptable, lnet_nid_t nid) +{ + struct list_head *peers; + lnet_peer_t *lp; + + LASSERT(!the_lnet.ln_shutdown); + + peers = &ptable->pt_hash[lnet_nid2peerhash(nid)]; + list_for_each_entry(lp, peers, lp_hashlist) { + if (lp->lp_nid == nid) { + lnet_peer_addref_locked(lp); + return lp; + } + } + + return NULL; +} + +int +lnet_nid2peer_locked(lnet_peer_t **lpp, lnet_nid_t nid, int cpt) +{ + struct lnet_peer_table *ptable; + 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 (!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) + memset(lp, 0, sizeof(*lp)); + else + LIBCFS_CPT_ALLOC(lp, lnet_cpt_table(), cpt2, sizeof(*lp)); + + if (lp == NULL) { + rc = -ENOMEM; + lnet_net_lock(cpt); + goto out; + } + + 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_notifying = 0; + lp->lp_alive_count = 0; + lp->lp_timestamp = 0; + lp->lp_alive = !lnet_peers_start_down(); /* 1 bit!! */ + lp->lp_last_alive = cfs_time_current(); /* assumes alive */ + lp->lp_last_query = 0; /* haven't asked NI yet */ + lp->lp_ping_timestamp = 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_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) { + *lpp = lp2; + goto out; + } + + lp->lp_ni = lnet_net2ni_locked(LNET_NIDNET(nid), cpt2); + if (lp->lp_ni == NULL) { + rc = -EHOSTUNREACH; + goto out; + } + + lp->lp_txcredits = + lp->lp_mintxcredits = lp->lp_ni->ni_peertxcredits; + lp->lp_rtrcredits = + lp->lp_minrtrcredits = lnet_peer_buffer_credits(lp->lp_ni); + + list_add_tail(&lp->lp_hashlist, + &ptable->pt_hash[lnet_nid2peerhash(nid)]); + ptable->pt_version++; + *lpp = lp; + + return 0; +out: + if (lp != NULL) + list_add(&lp->lp_hashlist, &ptable->pt_deathrow); + ptable->pt_number--; + return rc; +} + +void +lnet_debug_peer(lnet_nid_t nid) +{ + char *aliveness = "NA"; + lnet_peer_t *lp; + int rc; + int cpt; + + cpt = lnet_cpt_of_nid(nid); + lnet_net_lock(cpt); + + rc = lnet_nid2peer_locked(&lp, nid, cpt); + if (rc != 0) { + lnet_net_unlock(cpt); + CDEBUG(D_WARNING, "No peer %s\n", libcfs_nid2str(nid)); + return; + } + + if (lnet_isrouter(lp) || lnet_peer_aliveness_enabled(lp)) + aliveness = lp->lp_alive ? "up" : "down"; + + CDEBUG(D_WARNING, "%-24s %4d %5s %5d %5d %5d %5d %5d %ld\n", + libcfs_nid2str(lp->lp_nid), lp->lp_refcount, + aliveness, lp->lp_ni->ni_peertxcredits, + lp->lp_rtrcredits, lp->lp_minrtrcredits, + lp->lp_txcredits, lp->lp_mintxcredits, lp->lp_txqnob); + + lnet_peer_decref_locked(lp); + + lnet_net_unlock(cpt); +} |