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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/node_subscr.c: TIPC "node down" subscription handling
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 1995-2006, Ericsson AB
Allan Stephensf1379172011-02-23 14:13:41 -05005 * Copyright (c) 2005, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "node_subscr.h"
39#include "node.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040
41/**
Per Liden4323add2006-01-18 00:38:21 +010042 * tipc_nodesub_subscribe - create "node down" subscription for specified node
Per Lidenb97bf3f2006-01-02 19:04:38 +010043 */
44
David S. Miller6c000552008-09-02 23:38:32 -070045void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
Per Lidenb97bf3f2006-01-02 19:04:38 +010046 void *usr_handle, net_ev_handler handle_down)
47{
Allan Stephensf1310722006-06-25 23:51:37 -070048 if (addr == tipc_own_addr) {
49 node_sub->node = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +010050 return;
51 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090052
Allan Stephensf1310722006-06-25 23:51:37 -070053 node_sub->node = tipc_node_find(addr);
54 if (!node_sub->node) {
55 warn("Node subscription rejected, unknown node 0x%x\n", addr);
56 return;
57 }
Per Lidenb97bf3f2006-01-02 19:04:38 +010058 node_sub->handle_node_down = handle_down;
59 node_sub->usr_handle = usr_handle;
Allan Stephensf1310722006-06-25 23:51:37 -070060
Per Liden4323add2006-01-18 00:38:21 +010061 tipc_node_lock(node_sub->node);
Per Lidenb97bf3f2006-01-02 19:04:38 +010062 list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
Per Liden4323add2006-01-18 00:38:21 +010063 tipc_node_unlock(node_sub->node);
Per Lidenb97bf3f2006-01-02 19:04:38 +010064}
65
66/**
Per Liden4323add2006-01-18 00:38:21 +010067 * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
Per Lidenb97bf3f2006-01-02 19:04:38 +010068 */
69
David S. Miller6c000552008-09-02 23:38:32 -070070void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
Per Lidenb97bf3f2006-01-02 19:04:38 +010071{
72 if (!node_sub->node)
73 return;
74
Per Liden4323add2006-01-18 00:38:21 +010075 tipc_node_lock(node_sub->node);
Per Lidenb97bf3f2006-01-02 19:04:38 +010076 list_del_init(&node_sub->nodesub_list);
Per Liden4323add2006-01-18 00:38:21 +010077 tipc_node_unlock(node_sub->node);
Per Lidenb97bf3f2006-01-02 19:04:38 +010078}
Allan Stephensf1379172011-02-23 14:13:41 -050079
80/**
81 * tipc_nodesub_notify - notify subscribers that a node is unreachable
82 *
83 * Note: node is locked by caller
84 */
85
86void tipc_nodesub_notify(struct tipc_node *node)
87{
88 struct tipc_node_subscr *ns;
89
90 list_for_each_entry(ns, &node->nsub, nodesub_list) {
91 if (ns->handle_node_down) {
92 tipc_k_signal((Handler)ns->handle_node_down,
93 (unsigned long)ns->usr_handle);
94 ns->handle_node_down = NULL;
95 }
96 }
97}