Commit d6d3146c authored by Menglong Dong's avatar Menglong Dong Committed by David S. Miller
Browse files

skb: add some helpers for skb drop reasons 



In order to simply the definition and assignment for
'enum skb_drop_reason', introduce some helpers.

SKB_DR() is used to define a variable of type 'enum skb_drop_reason'
with the 'SKB_DROP_REASON_NOT_SPECIFIED' initial value.

SKB_DR_SET() is used to set the value of the variable. Seems it is
a little useless? But it makes the code shorter.

SKB_DR_OR() is used to set the value of the variable if it is not set
yet, which means its value is SKB_DROP_REASON_NOT_SPECIFIED.

Signed-off-by: default avatarMenglong Dong <imagedong@tencent.com>
Reviewed-by: default avatarJiang Biao <benbjiang@tencent.com>
Reviewed-by: default avatarHao Peng <flyingpeng@tencent.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dba47afd

include/linux/skbuff.h

+12 −0
Original line number Diff line number Diff line
@@ -450,6 +450,18 @@ enum skb_drop_reason { 
	SKB_DROP_REASON_MAX,

};



#define SKB_DR_INIT(name, reason)				\

	enum skb_drop_reason name = SKB_DROP_REASON_##reason

#define SKB_DR(name)						\

	SKB_DR_INIT(name, NOT_SPECIFIED)

#define SKB_DR_SET(name, reason)				\

	(name = SKB_DROP_REASON_##reason)

#define SKB_DR_OR(name, reason)					\

	do {							\

		if (name == SKB_DROP_REASON_NOT_SPECIFIED)	\

			SKB_DR_SET(name, reason);		\

	} while (0)



/* To allow 64K frame to be packed as single skb without frag_list we

 * require 64K/PAGE_SIZE pages plus 1 additional page to allow for

 * buffers which do not start on a page boundary.