net/tipc/core.h

   1 /*
   2  * net/tipc/core.h: Include file for TIPC global declarations
   3  *
   4  * Copyright (c) 2003-2005, Ericsson Research Canada
   5  * Copyright (c) 2005, Wind River Systems
   6  * Copyright (c) 2005-2006, Ericsson AB
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice, this
  13  * list of conditions and the following disclaimer.
  14  * Redistributions in binary form must reproduce the above copyright notice,
  15  * this list of conditions and the following disclaimer in the documentation
  16  * and/or other materials provided with the distribution.
  17  * Neither the names of the copyright holders nor the names of its
  18  * contributors may be used to endorse or promote products derived from this
  19  * software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _TIPC_CORE_H
  35 #define _TIPC_CORE_H
  36
  37 #include <net/tipc/tipc.h>
  38 #include <linux/types.h>
  39 #include <linux/kernel.h>
  40 #include <linux/errno.h>
  41 #include <linux/mm.h>
  42 #include <linux/timer.h>
  43 #include <linux/string.h>
  44 #include <asm/uaccess.h>
  45 #include <linux/interrupt.h>
  46 #include <asm/atomic.h>
  47 #include <asm/hardirq.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/in.h>
  50 #include <linux/list.h>
  51 #include <linux/vmalloc.h>
  52
  53 /*
  54  * TIPC debugging code
  55  */
  56
  57 #define assert(i)  BUG_ON(!(i))
  58
  59 struct tipc_msg;
  60 extern struct print_buf *CONS, *LOG;
  61 extern struct print_buf *TEE(struct print_buf *, struct print_buf *);
  62 void msg_print(struct print_buf*,struct tipc_msg *,const char*);
  63 void tipc_printf(struct print_buf *, const char *fmt, ...);
  64 void tipc_dump(struct print_buf*,const char *fmt, ...);
  65
  66 #ifdef CONFIG_TIPC_DEBUG
  67
  68 /*
  69  * TIPC debug support included:
  70  * - system messages are printed to TIPC_OUTPUT print buffer
  71  * - debug messages are printed to DBG_OUTPUT print buffer
  72  */
  73
  74 #define err(fmt, arg...)  tipc_printf(TIPC_OUTPUT, KERN_ERR "TIPC: " fmt, ## arg)
  75 #define warn(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_WARNING "TIPC: " fmt, ## arg)
  76 #define info(fmt, arg...) tipc_printf(TIPC_OUTPUT, KERN_NOTICE "TIPC: " fmt, ## arg)
  77
  78 #define dbg(fmt, arg...)  do {if (DBG_OUTPUT) tipc_printf(DBG_OUTPUT, fmt, ## arg);} while(0)
  79 #define msg_dbg(msg, txt) do {if (DBG_OUTPUT) msg_print(DBG_OUTPUT, msg, txt);} while(0)
  80 #define dump(fmt, arg...) do {if (DBG_OUTPUT) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)
  81
  82
  83 /*
  84  * By default, TIPC_OUTPUT is defined to be system console and TIPC log buffer,
  85  * while DBG_OUTPUT is the null print buffer.  These defaults can be changed
  86  * here, or on a per .c file basis, by redefining these symbols.  The following
  87  * print buffer options are available:
  88  *
  89  * NULL                 : Output to null print buffer (i.e. print nowhere)
  90  * CONS                 : Output to system console
  91  * LOG                  : Output to TIPC log buffer
  92  * &buf                 : Output to user-defined buffer (struct print_buf *)
  93  * TEE(&buf_a,&buf_b)   : Output to two print buffers (eg. TEE(CONS,LOG) )
  94  */
  95
  96 #ifndef TIPC_OUTPUT
  97 #define TIPC_OUTPUT TEE(CONS,LOG)
  98 #endif
  99
 100 #ifndef DBG_OUTPUT
 101 #define DBG_OUTPUT NULL
 102 #endif
 103
 104 #else
 105
 106 #ifndef DBG_OUTPUT
 107 #define DBG_OUTPUT NULL
 108 #endif
 109
 110 /*
 111  * TIPC debug support not included:
 112  * - system messages are printed to system console
 113  * - debug messages are not printed
 114  */
 115
 116 #define err(fmt, arg...)  printk(KERN_ERR "%s: " fmt "\n" , __FILE__ , ## arg)
 117 #define info(fmt, arg...) printk(KERN_INFO "%s: " fmt "\n" , __FILE__ , ## arg)
 118 #define warn(fmt, arg...) printk(KERN_WARNING "%s: " fmt "\n" , __FILE__ , ## arg)
 119
 120 #define dbg(fmt, arg...) do {} while (0)
 121 #define msg_dbg(msg,txt) do {} while (0)
 122 #define dump(fmt,arg...) do {} while (0)
 123
 124 #endif
 125
 126
 127 /*
 128  * TIPC-specific error codes
 129  */
 130
 131 #define ELINKCONG EAGAIN        /* link congestion <=> resource unavailable */
 132
 133 /*
 134  * Global configuration variables
 135  */
 136
 137 extern u32 tipc_own_addr;
 138 extern int tipc_max_zones;
 139 extern int tipc_max_clusters;
 140 extern int tipc_max_nodes;
 141 extern int tipc_max_slaves;
 142 extern int tipc_max_ports;
 143 extern int tipc_max_subscriptions;
 144 extern int tipc_max_publications;
 145 extern int tipc_net_id;
 146 extern int tipc_remote_management;
 147
 148 /*
 149  * Other global variables
 150  */
 151
 152 extern int tipc_mode;
 153 extern int tipc_random;
 154 extern const char tipc_alphabet[];
 155 extern atomic_t tipc_user_count;
 156
 157
 158 /*
 159  * Routines available to privileged subsystems
 160  */
 161
 162 extern int  start_core(void);
 163 extern void stop_core(void);
 164 extern int  start_net(void);
 165 extern void stop_net(void);
 166
 167 static inline int delimit(int val, int min, int max)
 168 {
 169         if (val > max)
 170                 return max;
 171         if (val < min)
 172                 return min;
 173         return val;
 174 }
 175
 176
 177 /*
 178  * TIPC timer and signal code
 179  */
 180
 181 typedef void (*Handler) (unsigned long);
 182
 183 u32 k_signal(Handler routine, unsigned long argument);
 184
 185 /**
 186  * k_init_timer - initialize a timer
 187  * @timer: pointer to timer structure
 188  * @routine: pointer to routine to invoke when timer expires
 189  * @argument: value to pass to routine when timer expires
 190  *
 191  * Timer must be initialized before use (and terminated when no longer needed).
 192  */
 193
 194 static inline void k_init_timer(struct timer_list *timer, Handler routine,
 195                                 unsigned long argument)
 196 {
 197         dbg("initializing timer %p\n", timer);
 198         init_timer(timer);
 199         timer->function = routine;
 200         timer->data = argument;
 201 }
 202
 203 /**
 204  * k_start_timer - start a timer
 205  * @timer: pointer to timer structure
 206  * @msec: time to delay (in ms)
 207  *
 208  * Schedules a previously initialized timer for later execution.
 209  * If timer is already running, the new timeout overrides the previous request.
 210  *
 211  * To ensure the timer doesn't expire before the specified delay elapses,
 212  * the amount of delay is rounded up when converting to the jiffies
 213  * then an additional jiffy is added to account for the fact that
 214  * the starting time may be in the middle of the current jiffy.
 215  */
 216
 217 static inline void k_start_timer(struct timer_list *timer, unsigned long msec)
 218 {
 219         dbg("starting timer %p for %u\n", timer, msec);
 220         mod_timer(timer, jiffies + msecs_to_jiffies(msec) + 1);
 221 }
 222
 223 /**
 224  * k_cancel_timer - cancel a timer
 225  * @timer: pointer to timer structure
 226  *
 227  * Cancels a previously initialized timer.
 228  * Can be called safely even if the timer is already inactive.
 229  *
 230  * WARNING: Must not be called when holding locks required by the timer's
 231  *          timeout routine, otherwise deadlock can occur on SMP systems!
 232  */
 233
 234 static inline void k_cancel_timer(struct timer_list *timer)
 235 {
 236         dbg("cancelling timer %p\n", timer);
 237         del_timer_sync(timer);
 238 }
 239
 240 /**
 241  * k_term_timer - terminate a timer
 242  * @timer: pointer to timer structure
 243  *
 244  * Prevents further use of a previously initialized timer.
 245  *
 246  * WARNING: Caller must ensure timer isn't currently running.
 247  *
 248  * (Do not "enhance" this routine to automatically cancel an active timer,
 249  * otherwise deadlock can arise when a timeout routine calls k_term_timer.)
 250  */
 251
 252 static inline void k_term_timer(struct timer_list *timer)
 253 {
 254         dbg("terminating timer %p\n", timer);
 255 }
 256
 257
 258 /*
 259  * TIPC message buffer code
 260  *
 261  * TIPC message buffer headroom leaves room for 14 byte Ethernet header,
 262  * while ensuring TIPC header is word aligned for quicker access
 263  */
 264
 265 #define BUF_HEADROOM 16u
 266
 267 struct tipc_skb_cb {
 268         void *handle;
 269 };
 270
 271 #define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))
 272
 273
 274 static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
 275 {
 276         return (struct tipc_msg *)skb->data;
 277 }
 278
 279 /**
 280  * buf_acquire - creates a TIPC message buffer
 281  * @size: message size (including TIPC header)
 282  *
 283  * Returns a new buffer.  Space is reserved for a data link header.
 284  */
 285
 286 static inline struct sk_buff *buf_acquire(u32 size)
 287 {
 288         struct sk_buff *skb;
 289         unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
 290
 291         skb = alloc_skb(buf_size, GFP_ATOMIC);
 292         if (skb) {
 293                 skb_reserve(skb, BUF_HEADROOM);
 294                 skb_put(skb, size);
 295                 skb->next = NULL;
 296         }
 297         return skb;
 298 }
 299
 300 /**
 301  * buf_discard - frees a TIPC message buffer
 302  * @skb: message buffer
 303  *
 304  * Frees a new buffer.  If passed NULL, just returns.
 305  */
 306
 307 static inline void buf_discard(struct sk_buff *skb)
 308 {
 309         if (likely(skb != NULL))
 310                 kfree_skb(skb);
 311 }
 312
 313 #endif