2 * net/tipc/core.h: Include file for TIPC global declarations
4 * Copyright (c) 2005-2006, Ericsson AB
5 * Copyright (c) 2005-2007, Wind River Systems
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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.
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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>
62 * TIPC sanity test macros
65 #define assert(i) BUG_ON(!(i))
68 * TIPC system monitoring code
72 * TIPC's print buffer subsystem supports the following print buffers:
74 * TIPC_NULL : null buffer (i.e. print nowhere)
75 * TIPC_CONS : system console
76 * TIPC_LOG : TIPC log buffer
77 * &buf : user-defined buffer (struct print_buf *)
79 * Note: TIPC_LOG is configured to echo its output to the system console;
80 * user-defined buffers can be configured to do the same thing.
83 extern struct print_buf *const TIPC_NULL;
84 extern struct print_buf *const TIPC_CONS;
85 extern struct print_buf *const TIPC_LOG;
87 void tipc_printf(struct print_buf *, const char *fmt, ...);
88 void tipc_msg_print(struct print_buf *, struct tipc_msg *, const char *);
89 void tipc_dump(struct print_buf *, const char *fmt, ...);
92 * TIPC_OUTPUT is the destination print buffer for system messages.
96 #define TIPC_OUTPUT TIPC_LOG
100 * TIPC can be configured to send system messages to TIPC_OUTPUT
101 * or to the system console only.
104 #ifdef CONFIG_TIPC_DEBUG
106 #define err(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
107 KERN_ERR "TIPC: " fmt, ## arg)
108 #define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
109 KERN_WARNING "TIPC: " fmt, ## arg)
110 #define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, \
111 KERN_NOTICE "TIPC: " fmt, ## arg)
115 #define err(fmt, arg...) printk(KERN_ERR "TIPC: " fmt , ## arg)
116 #define info(fmt, arg...) printk(KERN_INFO "TIPC: " fmt , ## arg)
117 #define warn(fmt, arg...) printk(KERN_WARNING "TIPC: " fmt , ## arg)
122 * DBG_OUTPUT is the destination print buffer for debug messages.
123 * It defaults to the the null print buffer, but can be redefined
124 * (typically in the individual .c files being debugged) to allow
125 * selected debug messages to be generated where needed.
129 #define DBG_OUTPUT TIPC_NULL
133 * TIPC can be configured to send debug messages to the specified print buffer
134 * (typically DBG_OUTPUT) or to suppress them entirely.
137 #ifdef CONFIG_TIPC_DEBUG
139 #define dbg(fmt, arg...) \
141 if (DBG_OUTPUT != TIPC_NULL) \
142 tipc_printf(DBG_OUTPUT, fmt, ## arg); \
144 #define msg_dbg(msg, txt) \
146 if (DBG_OUTPUT != TIPC_NULL) \
147 tipc_msg_print(DBG_OUTPUT, msg, txt); \
149 #define dump(fmt, arg...) \
151 if (DBG_OUTPUT != TIPC_NULL) \
152 tipc_dump(DBG_OUTPUT, fmt, ##arg); \
157 #define dbg(fmt, arg...) do {} while (0)
158 #define msg_dbg(msg, txt) do {} while (0)
159 #define dump(fmt, arg...) do {} while (0)
165 * TIPC-specific error codes
168 #define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
171 * Global configuration variables
174 extern u32 tipc_own_addr;
175 extern int tipc_max_zones;
176 extern int tipc_max_clusters;
177 extern int tipc_max_nodes;
178 extern int tipc_max_slaves;
179 extern int tipc_max_ports;
180 extern int tipc_max_subscriptions;
181 extern int tipc_max_publications;
182 extern int tipc_net_id;
183 extern int tipc_remote_management;
186 * Other global variables
189 extern int tipc_mode;
190 extern int tipc_random;
191 extern const char tipc_alphabet[];
192 extern atomic_t tipc_user_count;
196 * Routines available to privileged subsystems
199 extern int tipc_core_start(void);
200 extern void tipc_core_stop(void);
201 extern int tipc_core_start_net(void);
202 extern void tipc_core_stop_net(void);
203 extern int tipc_handler_start(void);
204 extern void tipc_handler_stop(void);
205 extern int tipc_netlink_start(void);
206 extern void tipc_netlink_stop(void);
207 extern int tipc_socket_init(void);
208 extern void tipc_socket_stop(void);
210 static inline int delimit(int val, int min, int max)
221 * TIPC timer and signal code
224 typedef void (*Handler) (unsigned long);
226 u32 tipc_k_signal(Handler routine, unsigned long argument);
229 * k_init_timer - initialize a timer
230 * @timer: pointer to timer structure
231 * @routine: pointer to routine to invoke when timer expires
232 * @argument: value to pass to routine when timer expires
234 * Timer must be initialized before use (and terminated when no longer needed).
237 static inline void k_init_timer(struct timer_list *timer, Handler routine,
238 unsigned long argument)
240 dbg("initializing timer %p\n", timer);
241 setup_timer(timer, routine, argument);
245 * k_start_timer - start a timer
246 * @timer: pointer to timer structure
247 * @msec: time to delay (in ms)
249 * Schedules a previously initialized timer for later execution.
250 * If timer is already running, the new timeout overrides the previous request.
252 * To ensure the timer doesn't expire before the specified delay elapses,
253 * the amount of delay is rounded up when converting to the jiffies
254 * then an additional jiffy is added to account for the fact that
255 * the starting time may be in the middle of the current jiffy.
258 static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
260 dbg("starting timer %p for %u\n", timer, msec);
261 mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
265 * k_cancel_timer - cancel a timer
266 * @timer: pointer to timer structure
268 * Cancels a previously initialized timer.
269 * Can be called safely even if the timer is already inactive.
271 * WARNING: Must not be called when holding locks required by the timer's
272 * timeout routine, otherwise deadlock can occur on SMP systems!
275 static inline void k_cancel_timer(struct timer_list *timer)
277 dbg("cancelling timer %p\n", timer);
278 del_timer_sync(timer);
282 * k_term_timer - terminate a timer
283 * @timer: pointer to timer structure
285 * Prevents further use of a previously initialized timer.
287 * WARNING: Caller must ensure timer isn't currently running.
289 * (Do not "enhance" this routine to automatically cancel an active timer,
290 * otherwise deadlock can arise when a timeout routine calls k_term_timer.)
293 static inline void k_term_timer(struct timer_list *timer)
295 dbg("terminating timer %p\n", timer);
300 * TIPC message buffer code
302 * TIPC message buffer headroom reserves space for a link-level header
303 * (in case the message is sent off-node),
304 * while ensuring TIPC header is word aligned for quicker access
306 * The largest header currently supported is 18 bytes, which is used when
307 * the standard 14 byte Ethernet header has 4 added bytes for VLAN info
310 #define BUF_HEADROOM 20u
316 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
319 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
321 return (struct tipc_msg *)skb->data;
325 * buf_acquire - creates a TIPC message buffer
326 * @size: message size (including TIPC header)
328 * Returns a new buffer with data pointers set to the specified size.
330 * NOTE: Headroom is reserved to allow prepending of a data link header.
331 * There may also be unrequested tailroom present at the buffer's end.
334 static inline struct sk_buff *buf_acquire(u32 size)
337 unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
339 skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
341 skb_reserve(skb, BUF_HEADROOM);
349 * buf_discard - frees a TIPC message buffer
350 * @skb: message buffer
352 * Frees a message buffer. If passed NULL, just returns.
355 static inline void buf_discard(struct sk_buff *skb)
361 * buf_linearize - convert a TIPC message buffer into a single contiguous piece
362 * @skb: message buffer
364 * Returns 0 on success.
367 static inline int buf_linearize(struct sk_buff *skb)
369 return skb_linearize(skb);