linux/net/tipc/core.c
Allan Stephens 8c12118db7 tipc: Minor optimization to deactivation of Ethernet media suppot
Change TIPC's shutdown code to deactivate generic networking support
before terminating Ethernet media support. The deactivation of generic
networking support causes all existing bearers to be destroyed, meaning
the Ethernet media termination routine no longer has to bother marking
them as unavailable.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-12-27 11:33:41 -05:00

214 lines
5.2 KiB
C

/*
* net/tipc/core.c: TIPC module code
*
* Copyright (c) 2003-2006, Ericsson AB
* Copyright (c) 2005-2006, 2010-2011, 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/module.h>
#include "core.h"
#include "ref.h"
#include "name_table.h"
#include "subscr.h"
#include "config.h"
#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;
const char tipc_alphabet[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
/* configurable TIPC parameters */
u32 tipc_own_addr;
int tipc_max_ports;
int tipc_max_subscriptions;
int tipc_max_publications;
int tipc_net_id;
int tipc_remote_management;
/**
* tipc_buf_acquire - creates a TIPC message buffer
* @size: message size (including TIPC header)
*
* Returns a new buffer with data pointers set to the specified size.
*
* NOTE: Headroom is reserved to allow prepending of a data link header.
* There may also be unrequested tailroom present at the buffer's end.
*/
struct sk_buff *tipc_buf_acquire(u32 size)
{
struct sk_buff *skb;
unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
if (skb) {
skb_reserve(skb, BUF_HEADROOM);
skb_put(skb, size);
skb->next = NULL;
}
return skb;
}
/**
* tipc_core_stop_net - shut down TIPC networking sub-systems
*/
static void tipc_core_stop_net(void)
{
tipc_net_stop();
tipc_eth_media_stop();
}
/**
* start_net - start TIPC networking sub-systems
*/
int tipc_core_start_net(unsigned long addr)
{
int res;
res = tipc_net_start(addr);
if (!res)
res = tipc_eth_media_start();
if (res)
tipc_core_stop_net();
return res;
}
/**
* tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
*/
static 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_nametbl_stop();
tipc_ref_table_stop();
tipc_socket_stop();
tipc_log_resize(0);
}
/**
* tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
*/
static 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;
res = tipc_handler_start();
if (!res)
res = tipc_ref_table_init(tipc_max_ports, tipc_random);
if (!res)
res = tipc_nametbl_init();
if (!res)
res = tipc_k_signal((Handler)tipc_subscr_start, 0);
if (!res)
res = tipc_k_signal((Handler)tipc_cfg_init, 0);
if (!res)
res = tipc_netlink_start();
if (!res)
res = tipc_socket_init();
if (res)
tipc_core_stop();
return res;
}
static int __init tipc_init(void)
{
int res;
if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
warn("Unable to create log buffer\n");
info("Activated (version " TIPC_MOD_VER ")\n");
tipc_own_addr = 0;
tipc_remote_management = 1;
tipc_max_publications = 10000;
tipc_max_subscriptions = 2000;
tipc_max_ports = CONFIG_TIPC_PORTS;
tipc_net_id = 4711;
res = tipc_core_start();
if (res)
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");
}
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);