alistair23-linux/net/tipc/core.h
Allan Stephens 03194379a7 tipc: Fix initialization sequence problems when entering network mode
This patch ensures that TIPC's topology service and configuration
service are shut down before switching into "network mode".  This
ensures that TIPC does not mistakenly try to send unnecessary
"publication withdraw" messages to other nodes before it is fully
initialized for sending off-node messages.  Note that the node's
current network address is now updated only after the two services
are shut down; this ensures that any existing connections to the
topology server are terminated correctly using the old address.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-21 14:55:04 -07:00

376 lines
9.9 KiB
C

/*
* net/tipc/core.h: Include file for TIPC global declarations
*
* Copyright (c) 2005-2006, Ericsson AB
* Copyright (c) 2005-2007, 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.
*/
#ifndef _TIPC_CORE_H
#define _TIPC_CORE_H
#include <linux/tipc.h>
#include <linux/tipc_config.h>
#include <net/tipc/tipc_msg.h>
#include <net/tipc/tipc_port.h>
#include <net/tipc/tipc_bearer.h>
#include <net/tipc/tipc.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/hardirq.h>
#include <linux/netdevice.h>
#include <linux/in.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
/*
* TIPC sanity test macros
*/
#define assert(i) BUG_ON(!(i))
/*
* TIPC system monitoring code
*/
/*
* TIPC's print buffer subsystem supports the following print buffers:
*
* TIPC_NULL : null buffer (i.e. print nowhere)
* TIPC_CONS : system console
* TIPC_LOG : TIPC log buffer
* &buf : user-defined buffer (struct print_buf *)
*
* Note: TIPC_LOG is configured to echo its output to the system console;
* user-defined buffers can be configured to do the same thing.
*/
extern struct print_buf *const TIPC_NULL;
extern struct print_buf *const TIPC_CONS;
extern struct print_buf *const TIPC_LOG;
void tipc_printf(struct print_buf *, const char *fmt, ...);
/*
* TIPC_OUTPUT is the destination print buffer for system messages.
*/
#ifndef TIPC_OUTPUT
#define TIPC_OUTPUT TIPC_LOG
#endif
/*
* TIPC can be configured to send system messages to TIPC_OUTPUT
* or to the system console only.
*/
#ifdef CONFIG_TIPC_DEBUG
#define err(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
KERN_ERR "TIPC: " fmt, ## arg)
#define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
KERN_WARNING "TIPC: " fmt, ## arg)
#define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
KERN_NOTICE "TIPC: " fmt, ## arg)
#else
#define err(fmt, arg...) printk(KERN_ERR "TIPC: " fmt , ## arg)
#define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
#define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)
#endif
/*
* DBG_OUTPUT is the destination print buffer for debug messages.
* It defaults to the the null print buffer, but can be redefined
* (typically in the individual .c files being debugged) to allow
* selected debug messages to be generated where needed.
*/
#ifndef DBG_OUTPUT
#define DBG_OUTPUT TIPC_NULL
#endif
/*
* TIPC can be configured to send debug messages to the specified print buffer
* (typically DBG_OUTPUT) or to suppress them entirely.
*/
#ifdef CONFIG_TIPC_DEBUG
#define dbg(fmt, arg...) \
do { \
if (DBG_OUTPUT != TIPC_NULL) \
tipc_printf(DBG_OUTPUT, fmt, ## arg); \
} while (0)
#define msg_dbg(msg, txt) \
do { \
if (DBG_OUTPUT != TIPC_NULL) \
tipc_msg_dbg(DBG_OUTPUT, msg, txt); \
} while (0)
#define dump(fmt, arg...) \
do { \
if (DBG_OUTPUT != TIPC_NULL) \
tipc_dump_dbg(DBG_OUTPUT, fmt, ##arg); \
} while (0)
void tipc_msg_dbg(struct print_buf *, struct tipc_msg *, const char *);
void tipc_dump_dbg(struct print_buf *, const char *fmt, ...);
#else
#define dbg(fmt, arg...) do {} while (0)
#define msg_dbg(msg, txt) do {} while (0)
#define dump(fmt, arg...) do {} while (0)
#define tipc_msg_dbg(...) do {} while (0)
#define tipc_dump_dbg(...) do {} while (0)
#endif
/*
* TIPC-specific error codes
*/
#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
/*
* Global configuration variables
*/
extern u32 tipc_own_addr;
extern int tipc_max_zones;
extern int tipc_max_clusters;
extern int tipc_max_nodes;
extern int tipc_max_slaves;
extern int tipc_max_ports;
extern int tipc_max_subscriptions;
extern int tipc_max_publications;
extern int tipc_net_id;
extern int tipc_remote_management;
/*
* Other global variables
*/
extern int tipc_mode;
extern int tipc_random;
extern const char tipc_alphabet[];
extern atomic_t tipc_user_count;
/*
* Routines available to privileged subsystems
*/
extern int tipc_core_start(void);
extern void tipc_core_stop(void);
extern int tipc_core_start_net(unsigned long addr);
extern void tipc_core_stop_net(void);
extern int tipc_handler_start(void);
extern void tipc_handler_stop(void);
extern int tipc_netlink_start(void);
extern void tipc_netlink_stop(void);
extern int tipc_socket_init(void);
extern void tipc_socket_stop(void);
static inline int delimit(int val, int min, int max)
{
if (val > max)
return max;
if (val < min)
return min;
return val;
}
/*
* TIPC timer and signal code
*/
typedef void (*Handler) (unsigned long);
u32 tipc_k_signal(Handler routine, unsigned long argument);
/**
* k_init_timer - initialize a timer
* @timer: pointer to timer structure
* @routine: pointer to routine to invoke when timer expires
* @argument: value to pass to routine when timer expires
*
* Timer must be initialized before use (and terminated when no longer needed).
*/
static inline void k_init_timer(struct timer_list *timer, Handler routine,
unsigned long argument)
{
dbg("initializing timer %p\n", timer);
setup_timer(timer, routine, argument);
}
/**
* k_start_timer - start a timer
* @timer: pointer to timer structure
* @msec: time to delay (in ms)
*
* Schedules a previously initialized timer for later execution.
* If timer is already running, the new timeout overrides the previous request.
*
* To ensure the timer doesn't expire before the specified delay elapses,
* the amount of delay is rounded up when converting to the jiffies
* then an additional jiffy is added to account for the fact that
* the starting time may be in the middle of the current jiffy.
*/
static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
{
dbg("starting timer %p for %u\n", timer, msec);
mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
}
/**
* k_cancel_timer - cancel a timer
* @timer: pointer to timer structure
*
* Cancels a previously initialized timer.
* Can be called safely even if the timer is already inactive.
*
* WARNING: Must not be called when holding locks required by the timer's
* timeout routine, otherwise deadlock can occur on SMP systems!
*/
static inline void k_cancel_timer(struct timer_list *timer)
{
dbg("cancelling timer %p\n", timer);
del_timer_sync(timer);
}
/**
* k_term_timer - terminate a timer
* @timer: pointer to timer structure
*
* Prevents further use of a previously initialized timer.
*
* WARNING: Caller must ensure timer isn't currently running.
*
* (Do not "enhance" this routine to automatically cancel an active timer,
* otherwise deadlock can arise when a timeout routine calls k_term_timer.)
*/
static inline void k_term_timer(struct timer_list *timer)
{
dbg("terminating timer %p\n", timer);
}
/*
* TIPC message buffer code
*
* TIPC message buffer headroom reserves space for the worst-case
* link-level device header (in case the message is sent off-node).
*
* Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
* are word aligned for quicker access
*/
#define BUF_HEADROOM LL_MAX_HEADER
struct tipc_skb_cb {
void *handle;
};
#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
{
return (struct tipc_msg *)skb->data;
}
/**
* 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.
*/
static inline struct sk_buff *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;
}
/**
* buf_discard - frees a TIPC message buffer
* @skb: message buffer
*
* Frees a message buffer. If passed NULL, just returns.
*/
static inline void buf_discard(struct sk_buff *skb)
{
kfree_skb(skb);
}
/**
* buf_linearize - convert a TIPC message buffer into a single contiguous piece
* @skb: message buffer
*
* Returns 0 on success.
*/
static inline int buf_linearize(struct sk_buff *skb)
{
return skb_linearize(skb);
}
#endif