--- /dev/null
+/*
+ * 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 "../../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 initialized */
+ 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);
+ }
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(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);
+}
Code Review / kvmfornfv.git / blobdiff