334 lines
9.4 KiB
C
334 lines
9.4 KiB
C
/*
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* net/tipc/core.h: Include file for TIPC global declarations
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*
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* Copyright (c) 2005-2006, Ericsson AB
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* Copyright (c) 2005-2006, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_CORE_H
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#define _TIPC_CORE_H
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#include <linux/tipc.h>
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#include <linux/tipc_config.h>
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#include <net/tipc/tipc_msg.h>
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#include <net/tipc/tipc_port.h>
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#include <net/tipc/tipc_bearer.h>
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#include <net/tipc/tipc.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <asm/uaccess.h>
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#include <linux/interrupt.h>
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#include <asm/atomic.h>
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#include <asm/hardirq.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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/*
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* TIPC debugging code
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*/
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#define assert(i) BUG_ON(!(i))
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struct tipc_msg;
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extern struct print_buf *TIPC_CONS, *TIPC_LOG;
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extern struct print_buf *TIPC_TEE(struct print_buf *, struct print_buf *);
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void tipc_msg_print(struct print_buf*,struct tipc_msg *,const char*);
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void tipc_printf(struct print_buf *, const char *fmt, ...);
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void tipc_dump(struct print_buf*,const char *fmt, ...);
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#ifdef CONFIG_TIPC_DEBUG
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/*
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* TIPC debug support included:
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* - system messages are printed to TIPC_OUTPUT print buffer
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* - debug messages are printed to DBG_OUTPUT print buffer
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*/
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#define err(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_ERR "TIPC: " fmt, ## arg)
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#define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_WARNING "TIPC: " fmt, ## arg)
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#define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_NOTICE "TIPC: " fmt, ## arg)
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#define dbg(fmt, arg...) do {if (DBG_OUTPUT) tipc_printf(DBG_OUTPUT, fmt, ## arg);} while(0)
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#define msg_dbg(msg, txt) do {if (DBG_OUTPUT) tipc_msg_print(DBG_OUTPUT, msg, txt);} while(0)
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#define dump(fmt, arg...) do {if (DBG_OUTPUT) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)
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/*
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* By default, TIPC_OUTPUT is defined to be system console and TIPC log buffer,
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* while DBG_OUTPUT is the null print buffer. These defaults can be changed
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* here, or on a per .c file basis, by redefining these symbols. The following
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* print buffer options are available:
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*
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* NULL : Output to null print buffer (i.e. print nowhere)
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* TIPC_CONS : Output to system console
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* TIPC_LOG : Output to TIPC log buffer
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* &buf : Output to user-defined buffer (struct print_buf *)
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* TIPC_TEE(&buf_a,&buf_b) : Output to two print buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG) )
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*/
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#ifndef TIPC_OUTPUT
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#define TIPC_OUTPUT TIPC_TEE(TIPC_CONS,TIPC_LOG)
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#endif
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#ifndef DBG_OUTPUT
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#define DBG_OUTPUT NULL
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#endif
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#else
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/*
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* TIPC debug support not included:
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* - system messages are printed to system console
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* - debug messages are not printed
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*/
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#define err(fmt, arg...) printk(KERN_ERR "TIPC: " fmt , ## arg)
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#define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
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#define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)
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#define dbg(fmt, arg...) do {} while (0)
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#define msg_dbg(msg,txt) do {} while (0)
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#define dump(fmt,arg...) do {} while (0)
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/*
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* TIPC_OUTPUT is defined to be the system console, while DBG_OUTPUT is
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* the null print buffer. Thes ensures that any system or debug messages
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* that are generated without using the above macros are handled correctly.
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*/
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#undef TIPC_OUTPUT
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#define TIPC_OUTPUT TIPC_CONS
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#undef DBG_OUTPUT
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#define DBG_OUTPUT NULL
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#endif
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/*
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* TIPC-specific error codes
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*/
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#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
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/*
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* Global configuration variables
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*/
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extern u32 tipc_own_addr;
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extern int tipc_max_zones;
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extern int tipc_max_clusters;
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extern int tipc_max_nodes;
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extern int tipc_max_slaves;
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extern int tipc_max_ports;
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extern int tipc_max_subscriptions;
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extern int tipc_max_publications;
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extern int tipc_net_id;
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extern int tipc_remote_management;
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/*
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* Other global variables
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*/
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extern int tipc_mode;
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extern int tipc_random;
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extern const char tipc_alphabet[];
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extern atomic_t tipc_user_count;
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/*
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* Routines available to privileged subsystems
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*/
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extern int tipc_core_start(void);
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extern void tipc_core_stop(void);
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extern int tipc_core_start_net(void);
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extern void tipc_core_stop_net(void);
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static inline int delimit(int val, int min, int max)
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{
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if (val > max)
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return max;
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if (val < min)
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return min;
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return val;
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}
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/*
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* TIPC timer and signal code
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*/
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typedef void (*Handler) (unsigned long);
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u32 tipc_k_signal(Handler routine, unsigned long argument);
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/**
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* k_init_timer - initialize a timer
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* @timer: pointer to timer structure
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* @routine: pointer to routine to invoke when timer expires
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* @argument: value to pass to routine when timer expires
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*
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* Timer must be initialized before use (and terminated when no longer needed).
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*/
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static inline void k_init_timer(struct timer_list *timer, Handler routine,
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unsigned long argument)
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{
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dbg("initializing timer %p\n", timer);
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init_timer(timer);
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timer->function = routine;
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timer->data = argument;
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}
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/**
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* k_start_timer - start a timer
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* @timer: pointer to timer structure
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* @msec: time to delay (in ms)
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*
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* Schedules a previously initialized timer for later execution.
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* If timer is already running, the new timeout overrides the previous request.
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*
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* To ensure the timer doesn't expire before the specified delay elapses,
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* the amount of delay is rounded up when converting to the jiffies
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* then an additional jiffy is added to account for the fact that
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* the starting time may be in the middle of the current jiffy.
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*/
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static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
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{
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dbg("starting timer %p for %u\n", timer, msec);
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mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
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}
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/**
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* k_cancel_timer - cancel a timer
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* @timer: pointer to timer structure
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*
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* Cancels a previously initialized timer.
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* Can be called safely even if the timer is already inactive.
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*
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* WARNING: Must not be called when holding locks required by the timer's
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* timeout routine, otherwise deadlock can occur on SMP systems!
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*/
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static inline void k_cancel_timer(struct timer_list *timer)
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{
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dbg("cancelling timer %p\n", timer);
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del_timer_sync(timer);
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}
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/**
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* k_term_timer - terminate a timer
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* @timer: pointer to timer structure
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*
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* Prevents further use of a previously initialized timer.
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*
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* WARNING: Caller must ensure timer isn't currently running.
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*
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* (Do not "enhance" this routine to automatically cancel an active timer,
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* otherwise deadlock can arise when a timeout routine calls k_term_timer.)
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*/
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static inline void k_term_timer(struct timer_list *timer)
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{
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dbg("terminating timer %p\n", timer);
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}
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/*
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* TIPC message buffer code
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*
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* TIPC message buffer headroom leaves room for 14 byte Ethernet header,
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* while ensuring TIPC header is word aligned for quicker access
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*/
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#define BUF_HEADROOM 16u
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struct tipc_skb_cb {
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void *handle;
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};
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#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
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static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
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{
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return (struct tipc_msg *)skb->data;
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}
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/**
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* buf_acquire - creates a TIPC message buffer
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* @size: message size (including TIPC header)
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*
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* Returns a new buffer with data pointers set to the specified size.
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*
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* NOTE: Headroom is reserved to allow prepending of a data link header.
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* There may also be unrequested tailroom present at the buffer's end.
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*/
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static inline struct sk_buff *buf_acquire(u32 size)
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{
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struct sk_buff *skb;
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unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
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skb = alloc_skb(buf_size, GFP_ATOMIC);
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if (skb) {
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skb_reserve(skb, BUF_HEADROOM);
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skb_put(skb, size);
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skb->next = NULL;
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}
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return skb;
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}
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/**
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* buf_discard - frees a TIPC message buffer
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* @skb: message buffer
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*
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* Frees a message buffer. If passed NULL, just returns.
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*/
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static inline void buf_discard(struct sk_buff *skb)
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{
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if (likely(skb != NULL))
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kfree_skb(skb);
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}
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#endif
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