5a0e4878d3b72b7c44cfd7b81cb88117b691029b
2 * net/tipc/core.h: Include file for TIPC global declarations
4 * Copyright (c) 2005-2006, Ericsson AB
5 * Copyright (c) 2005-2006, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 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.
20 * 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.
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
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include <linux/tipc.h>
41 #include <linux/tipc_config.h>
42 #include <net/tipc/tipc_msg.h>
43 #include <net/tipc/tipc_port.h>
44 #include <net/tipc/tipc_bearer.h>
45 #include <net/tipc/tipc.h>
46 #include <linux/types.h>
47 #include <linux/kernel.h>
48 #include <linux/errno.h>
50 #include <linux/timer.h>
51 #include <linux/string.h>
52 #include <asm/uaccess.h>
53 #include <linux/interrupt.h>
54 #include <asm/atomic.h>
55 #include <asm/hardirq.h>
56 #include <linux/netdevice.h>
58 #include <linux/list.h>
59 #include <linux/vmalloc.h>
65 #define assert(i) BUG_ON(!(i))
68 extern struct print_buf
*TIPC_NULL
, *TIPC_CONS
, *TIPC_LOG
;
69 extern struct print_buf
*TIPC_TEE(struct print_buf
*, struct print_buf
*);
70 void tipc_msg_print(struct print_buf
*,struct tipc_msg
*,const char*);
71 void tipc_printf(struct print_buf
*, const char *fmt
, ...);
72 void tipc_dump(struct print_buf
*,const char *fmt
, ...);
74 #ifdef CONFIG_TIPC_DEBUG
77 * TIPC debug support included:
78 * - system messages are printed to TIPC_OUTPUT print buffer
79 * - debug messages are printed to DBG_OUTPUT print buffer
82 #define err(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_ERR "TIPC: " fmt, ## arg)
83 #define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_WARNING "TIPC: " fmt, ## arg)
84 #define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_NOTICE "TIPC: " fmt, ## arg)
86 #define dbg(fmt, arg...) do {if (DBG_OUTPUT != TIPC_NULL) tipc_printf(DBG_OUTPUT, fmt, ## arg);} while(0)
87 #define msg_dbg(msg, txt) do {if (DBG_OUTPUT != TIPC_NULL) tipc_msg_print(DBG_OUTPUT, msg, txt);} while(0)
88 #define dump(fmt, arg...) do {if (DBG_OUTPUT != TIPC_NULL) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)
92 * By default, TIPC_OUTPUT is defined to be system console and TIPC log buffer,
93 * while DBG_OUTPUT is the null print buffer. These defaults can be changed
94 * here, or on a per .c file basis, by redefining these symbols. The following
95 * print buffer options are available:
97 * TIPC_NULL : null buffer (i.e. print nowhere)
98 * TIPC_CONS : system console
99 * TIPC_LOG : TIPC log buffer
100 * &buf : user-defined buffer (struct print_buf *)
101 * TIPC_TEE(&buf_a,&buf_b) : list of buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG))
105 #define TIPC_OUTPUT TIPC_TEE(TIPC_CONS,TIPC_LOG)
109 #define DBG_OUTPUT TIPC_NULL
115 * TIPC debug support not included:
116 * - system messages are printed to system console
117 * - debug messages are not printed
120 #define err(fmt, arg...) printk(KERN_ERR "TIPC: " fmt , ## arg)
121 #define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
122 #define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)
124 #define dbg(fmt, arg...) do {} while (0)
125 #define msg_dbg(msg,txt) do {} while (0)
126 #define dump(fmt,arg...) do {} while (0)
130 * TIPC_OUTPUT is defined to be the system console, while DBG_OUTPUT is
131 * the null print buffer. Thes ensures that any system or debug messages
132 * that are generated without using the above macros are handled correctly.
136 #define TIPC_OUTPUT TIPC_CONS
139 #define DBG_OUTPUT TIPC_NULL
145 * TIPC-specific error codes
148 #define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
151 * Global configuration variables
154 extern u32 tipc_own_addr
;
155 extern int tipc_max_zones
;
156 extern int tipc_max_clusters
;
157 extern int tipc_max_nodes
;
158 extern int tipc_max_slaves
;
159 extern int tipc_max_ports
;
160 extern int tipc_max_subscriptions
;
161 extern int tipc_max_publications
;
162 extern int tipc_net_id
;
163 extern int tipc_remote_management
;
166 * Other global variables
169 extern int tipc_mode
;
170 extern int tipc_random
;
171 extern const char tipc_alphabet
[];
172 extern atomic_t tipc_user_count
;
176 * Routines available to privileged subsystems
179 extern int tipc_core_start(void);
180 extern void tipc_core_stop(void);
181 extern int tipc_core_start_net(void);
182 extern void tipc_core_stop_net(void);
183 extern int tipc_handler_start(void);
184 extern void tipc_handler_stop(void);
185 extern int tipc_netlink_start(void);
186 extern void tipc_netlink_stop(void);
187 extern int tipc_socket_init(void);
188 extern void tipc_socket_stop(void);
190 static inline int delimit(int val
, int min
, int max
)
201 * TIPC timer and signal code
204 typedef void (*Handler
) (unsigned long);
206 u32
tipc_k_signal(Handler routine
, unsigned long argument
);
209 * k_init_timer - initialize a timer
210 * @timer: pointer to timer structure
211 * @routine: pointer to routine to invoke when timer expires
212 * @argument: value to pass to routine when timer expires
214 * Timer must be initialized before use (and terminated when no longer needed).
217 static inline void k_init_timer(struct timer_list
*timer
, Handler routine
,
218 unsigned long argument
)
220 dbg("initializing timer %p\n", timer
);
221 setup_timer(timer
, routine
, argument
);
225 * k_start_timer - start a timer
226 * @timer: pointer to timer structure
227 * @msec: time to delay (in ms)
229 * Schedules a previously initialized timer for later execution.
230 * If timer is already running, the new timeout overrides the previous request.
232 * To ensure the timer doesn't expire before the specified delay elapses,
233 * the amount of delay is rounded up when converting to the jiffies
234 * then an additional jiffy is added to account for the fact that
235 * the starting time may be in the middle of the current jiffy.
238 static inline void k_start_timer(struct timer_list
*timer
, unsigned long msec
)
240 dbg("starting timer %p for %u\n", timer
, msec
);
241 mod_timer(timer
, jiffies
+ msecs_to_jiffies(msec
) + 1);
245 * k_cancel_timer - cancel a timer
246 * @timer: pointer to timer structure
248 * Cancels a previously initialized timer.
249 * Can be called safely even if the timer is already inactive.
251 * WARNING: Must not be called when holding locks required by the timer's
252 * timeout routine, otherwise deadlock can occur on SMP systems!
255 static inline void k_cancel_timer(struct timer_list
*timer
)
257 dbg("cancelling timer %p\n", timer
);
258 del_timer_sync(timer
);
262 * k_term_timer - terminate a timer
263 * @timer: pointer to timer structure
265 * Prevents further use of a previously initialized timer.
267 * WARNING: Caller must ensure timer isn't currently running.
269 * (Do not "enhance" this routine to automatically cancel an active timer,
270 * otherwise deadlock can arise when a timeout routine calls k_term_timer.)
273 static inline void k_term_timer(struct timer_list
*timer
)
275 dbg("terminating timer %p\n", timer
);
280 * TIPC message buffer code
282 * TIPC message buffer headroom reserves space for the worst-case
283 * link-level device header (in case the message is sent off-node).
285 * Note: Headroom should be a multiple of 4 to ensure the TIPC header fields
286 * are word aligned for quicker access
289 #define BUF_HEADROOM LL_MAX_HEADER
295 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
298 static inline struct tipc_msg
*buf_msg(struct sk_buff
*skb
)
300 return (struct tipc_msg
*)skb
->data
;
304 * buf_acquire - creates a TIPC message buffer
305 * @size: message size (including TIPC header)
307 * Returns a new buffer with data pointers set to the specified size.
309 * NOTE: Headroom is reserved to allow prepending of a data link header.
310 * There may also be unrequested tailroom present at the buffer's end.
313 static inline struct sk_buff
*buf_acquire(u32 size
)
316 unsigned int buf_size
= (BUF_HEADROOM
+ size
+ 3) & ~3u;
318 skb
= alloc_skb_fclone(buf_size
, GFP_ATOMIC
);
320 skb_reserve(skb
, BUF_HEADROOM
);
328 * buf_discard - frees a TIPC message buffer
329 * @skb: message buffer
331 * Frees a message buffer. If passed NULL, just returns.
334 static inline void buf_discard(struct sk_buff
*skb
)
340 * buf_linearize - convert a TIPC message buffer into a single contiguous piece
341 * @skb: message buffer
343 * Returns 0 on success.
346 static inline int buf_linearize(struct sk_buff
*skb
)
348 return skb_linearize(skb
);
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