X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Ftipc%2Fcore.h;h=4638947c2326e0ea534f490b02abc767270d2c1a;hb=refs%2Fheads%2Fvserver;hp=1f2e8b27a13f1eaeea0acd73fbd743d3fe985832;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/net/tipc/core.h b/net/tipc/core.h
index 1f2e8b27a..4638947c2 100644
--- a/net/tipc/core.h
+++ b/net/tipc/core.h
@@ -2,7 +2,7 @@
  * net/tipc/core.h: Include file for TIPC global declarations
  * 
  * Copyright (c) 2005-2006, Ericsson AB
- * Copyright (c) 2005, Wind River Systems
+ * Copyright (c) 2005-2006, Wind River Systems
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -65,7 +65,7 @@
 #define assert(i)  BUG_ON(!(i))
 
 struct tipc_msg;
-extern struct print_buf *TIPC_CONS, *TIPC_LOG;
+extern struct print_buf *TIPC_NULL, *TIPC_CONS, *TIPC_LOG;
 extern struct print_buf *TIPC_TEE(struct print_buf *, struct print_buf *);
 void tipc_msg_print(struct print_buf*,struct tipc_msg *,const char*);
 void tipc_printf(struct print_buf *, const char *fmt, ...);
@@ -83,9 +83,9 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
 #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)
 
-#define dbg(fmt, arg...)  do {if (DBG_OUTPUT) tipc_printf(DBG_OUTPUT, fmt, ## arg);} while(0)
-#define msg_dbg(msg, txt) do {if (DBG_OUTPUT) tipc_msg_print(DBG_OUTPUT, msg, txt);} while(0)
-#define dump(fmt, arg...) do {if (DBG_OUTPUT) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)
+#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_print(DBG_OUTPUT, msg, txt);} while(0)
+#define dump(fmt, arg...) do {if (DBG_OUTPUT != TIPC_NULL) tipc_dump(DBG_OUTPUT, fmt, ##arg);} while(0)
 
 
 /*	
@@ -94,11 +94,11 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
  * here, or on a per .c file basis, by redefining these symbols.  The following
  * print buffer options are available:
  *
- * NULL				: Output to null print buffer (i.e. print nowhere)
- * TIPC_CONS			: Output to system console
- * TIPC_LOG			: Output to TIPC log buffer 
- * &buf				: Output to user-defined buffer (struct print_buf *)
- * TIPC_TEE(&buf_a,&buf_b)	: Output to two print buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG) )
+ * TIPC_NULL		   : null buffer (i.e. print nowhere)
+ * TIPC_CONS		   : system console
+ * TIPC_LOG		   : TIPC log buffer
+ * &buf			   : user-defined buffer (struct print_buf *)
+ * TIPC_TEE(&buf_a,&buf_b) : list of buffers (eg. TIPC_TEE(TIPC_CONS,TIPC_LOG))
  */
 
 #ifndef TIPC_OUTPUT
@@ -106,15 +106,11 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
 #endif
 
 #ifndef DBG_OUTPUT
-#define DBG_OUTPUT NULL
+#define DBG_OUTPUT TIPC_NULL
 #endif
 
 #else
 
-#ifndef DBG_OUTPUT
-#define DBG_OUTPUT NULL
-#endif
-
 /*
  * TIPC debug support not included:
  * - system messages are printed to system console
@@ -129,6 +125,19 @@ void tipc_dump(struct print_buf*,const char *fmt, ...);
 #define msg_dbg(msg,txt) do {} while (0)
 #define dump(fmt,arg...) do {} while (0)
 
+
+/*	
+ * TIPC_OUTPUT is defined to be the system console, while DBG_OUTPUT is
+ * the null print buffer.  Thes ensures that any system or debug messages 
+ * that are generated without using the above macros are handled correctly.
+ */
+
+#undef  TIPC_OUTPUT
+#define TIPC_OUTPUT TIPC_CONS
+
+#undef  DBG_OUTPUT
+#define DBG_OUTPUT TIPC_NULL
+
 #endif			  
 
 
@@ -266,11 +275,15 @@ static inline void k_term_timer(struct timer_list *timer)
 /*
  * TIPC message buffer code
  *
- * TIPC message buffer headroom leaves room for 14 byte Ethernet header, 
+ * TIPC message buffer headroom reserves space for a link-level header
+ * (in case the message is sent off-node),
  * while ensuring TIPC header is word aligned for quicker access
+ *
+ * The largest header currently supported is 18 bytes, which is used when
+ * the standard 14 byte Ethernet header has 4 added bytes for VLAN info
  */
 
-#define BUF_HEADROOM 16u 
+#define BUF_HEADROOM 20u
 
 struct tipc_skb_cb {
 	void *handle;
@@ -288,7 +301,10 @@ static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
  * buf_acquire - creates a TIPC message buffer
  * @size: message size (including TIPC header)
  *
- * Returns a new buffer.  Space is reserved for a data link 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)
@@ -309,7 +325,7 @@ static inline struct sk_buff *buf_acquire(u32 size)
  * buf_discard - frees a TIPC message buffer
  * @skb: message buffer
  *
- * Frees a new buffer.  If passed NULL, just returns.
+ * Frees a message buffer.  If passed NULL, just returns.
  */
 
 static inline void buf_discard(struct sk_buff *skb)