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28353e7fad
tmp_suning_uos_patched/net/tipc/core.c
Allan Stephens 28353e7fad tipc: Consolidate subscriber & subscriber port references 
This patch modifies TIPC's network topology service so that it
only requires a single reference table entry per subscriber
connection, rather than two.  This is achieved by letting the
reference to the server port communicating with the subscriber
act as the reference to the subscriber object itself.  (Since
the subscriber cannot exist without its port, and vice versa,
this dual role for the reference is perfectly natural.)  This
consolidation reduces the size of the reference table by 50%
in the default configuration.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-19 13:29:47 -07:00

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/*
* net/tipc/core.c: TIPC module code
*
* Copyright (c) 2003-2006, Ericsson AB
* Copyright (c) 2005-2006, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/random.h>
#include "core.h"
#include "dbg.h"
#include "ref.h"
#include "net.h"
#include "user_reg.h"
#include "name_table.h"
#include "subscr.h"
#include "config.h"
#define TIPC_MOD_VER "1.6.4"
#ifndef CONFIG_TIPC_ZONES
#define CONFIG_TIPC_ZONES 3
#endif
#ifndef CONFIG_TIPC_CLUSTERS
#define CONFIG_TIPC_CLUSTERS 1
#endif
#ifndef CONFIG_TIPC_NODES
#define CONFIG_TIPC_NODES 255
#endif
#ifndef CONFIG_TIPC_SLAVE_NODES
#define CONFIG_TIPC_SLAVE_NODES 0
#endif
#ifndef CONFIG_TIPC_PORTS
#define CONFIG_TIPC_PORTS 8191
#endif
#ifndef CONFIG_TIPC_LOG
#define CONFIG_TIPC_LOG 0
#endif
/* global variables used by multiple sub-systems within TIPC */
int tipc_mode = TIPC_NOT_RUNNING;
int tipc_random;
atomic_t tipc_user_count = ATOMIC_INIT(0);
const char tipc_alphabet[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
/* configurable TIPC parameters */
u32 tipc_own_addr;
int tipc_max_zones;
int tipc_max_clusters;
int tipc_max_nodes;
int tipc_max_slaves;
int tipc_max_ports;
int tipc_max_subscriptions;
int tipc_max_publications;
int tipc_net_id;
int tipc_remote_management;
int tipc_get_mode(void)
{
return tipc_mode;
}
/**
* tipc_core_stop_net - shut down TIPC networking sub-systems
*/
void tipc_core_stop_net(void)
{
tipc_eth_media_stop();
tipc_net_stop();
}
/**
* start_net - start TIPC networking sub-systems
*/
int tipc_core_start_net(void)
{
int res;
if ((res = tipc_net_start()) ||
(res = tipc_eth_media_start())) {
tipc_core_stop_net();
}
return res;
}
/**
* tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
*/
void tipc_core_stop(void)
{
if (tipc_mode != TIPC_NODE_MODE)
return;
tipc_mode = TIPC_NOT_RUNNING;
tipc_netlink_stop();
tipc_handler_stop();
tipc_cfg_stop();
tipc_subscr_stop();
tipc_reg_stop();
tipc_nametbl_stop();
tipc_ref_table_stop();
tipc_socket_stop();
}
/**
* tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
*/
int tipc_core_start(void)
{
int res;
if (tipc_mode != TIPC_NOT_RUNNING)
return -ENOPROTOOPT;
get_random_bytes(&tipc_random, sizeof(tipc_random));
tipc_mode = TIPC_NODE_MODE;
if ((res = tipc_handler_start()) ||
(res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
(res = tipc_reg_start()) ||
(res = tipc_nametbl_init()) ||
(res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
(res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
(res = tipc_netlink_start()) ||
(res = tipc_socket_init())) {
tipc_core_stop();
}
return res;
}
static int __init tipc_init(void)
{
int res;
tipc_log_resize(CONFIG_TIPC_LOG);
info("Activated (version " TIPC_MOD_VER
" compiled " __DATE__ " " __TIME__ ")\n");
tipc_own_addr = 0;
tipc_remote_management = 1;
tipc_max_publications = 10000;
tipc_max_subscriptions = 2000;
tipc_max_ports = delimit(CONFIG_TIPC_PORTS, 127, 65536);
tipc_max_zones = delimit(CONFIG_TIPC_ZONES, 1, 255);
tipc_max_clusters = delimit(CONFIG_TIPC_CLUSTERS, 1, 1);
tipc_max_nodes = delimit(CONFIG_TIPC_NODES, 8, 2047);
tipc_max_slaves = delimit(CONFIG_TIPC_SLAVE_NODES, 0, 2047);
tipc_net_id = 4711;
if ((res = tipc_core_start()))
err("Unable to start in single node mode\n");
else
info("Started in single node mode\n");
return res;
}
static void __exit tipc_exit(void)
{
tipc_core_stop_net();
tipc_core_stop();
info("Deactivated\n");
tipc_log_resize(0);
}
module_init(tipc_init);
module_exit(tipc_exit);
MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(TIPC_MOD_VER);
/* Native TIPC API for kernel-space applications (see tipc.h) */
EXPORT_SYMBOL(tipc_attach);
EXPORT_SYMBOL(tipc_detach);
EXPORT_SYMBOL(tipc_get_addr);
EXPORT_SYMBOL(tipc_get_mode);
EXPORT_SYMBOL(tipc_createport);
EXPORT_SYMBOL(tipc_deleteport);
EXPORT_SYMBOL(tipc_ownidentity);
EXPORT_SYMBOL(tipc_portimportance);
EXPORT_SYMBOL(tipc_set_portimportance);
EXPORT_SYMBOL(tipc_portunreliable);
EXPORT_SYMBOL(tipc_set_portunreliable);
EXPORT_SYMBOL(tipc_portunreturnable);
EXPORT_SYMBOL(tipc_set_portunreturnable);
EXPORT_SYMBOL(tipc_publish);
EXPORT_SYMBOL(tipc_withdraw);
EXPORT_SYMBOL(tipc_connect2port);
EXPORT_SYMBOL(tipc_disconnect);
EXPORT_SYMBOL(tipc_shutdown);
EXPORT_SYMBOL(tipc_isconnected);
EXPORT_SYMBOL(tipc_peer);
EXPORT_SYMBOL(tipc_ref_valid);
EXPORT_SYMBOL(tipc_send);
EXPORT_SYMBOL(tipc_send_buf);
EXPORT_SYMBOL(tipc_send2name);
EXPORT_SYMBOL(tipc_forward2name);
EXPORT_SYMBOL(tipc_send_buf2name);
EXPORT_SYMBOL(tipc_forward_buf2name);
EXPORT_SYMBOL(tipc_send2port);
EXPORT_SYMBOL(tipc_forward2port);
EXPORT_SYMBOL(tipc_send_buf2port);
EXPORT_SYMBOL(tipc_forward_buf2port);
EXPORT_SYMBOL(tipc_multicast);
/* EXPORT_SYMBOL(tipc_multicast_buf); not available yet */
EXPORT_SYMBOL(tipc_ispublished);
EXPORT_SYMBOL(tipc_available_nodes);
/* TIPC API for external bearers (see tipc_bearer.h) */
EXPORT_SYMBOL(tipc_block_bearer);
EXPORT_SYMBOL(tipc_continue);
EXPORT_SYMBOL(tipc_disable_bearer);
EXPORT_SYMBOL(tipc_enable_bearer);
EXPORT_SYMBOL(tipc_recv_msg);
EXPORT_SYMBOL(tipc_register_media);
/* TIPC API for external APIs (see tipc_port.h) */
EXPORT_SYMBOL(tipc_createport_raw);
EXPORT_SYMBOL(tipc_reject_msg);
EXPORT_SYMBOL(tipc_send_buf_fast);
EXPORT_SYMBOL(tipc_acknowledge);
EXPORT_SYMBOL(tipc_get_port);
EXPORT_SYMBOL(tipc_get_handle);
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