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Commit 9f42f126 authored by Ian Campbell's avatar Ian Campbell Committed by David S. Miller
Browse files

net: pack skb_shared_info more efficiently 



nr_frags can be 8 bits since 256 is plenty of fragments. This allows it to be
packed with tx_flags.

Also by moving ip6_frag_id and dataref (both 4 bytes) next to each other we can
avoid a hole between ip6_frag_id and frag_list on 64 bit systems.

Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eeca6688

include/linux/skbuff.h

+3 −3
Original line number Diff line number Diff line
@@ -242,15 +242,15 @@ struct ubuf_info { 
 * the end of the header data, ie. at skb->end.

 */

struct skb_shared_info {

	unsigned short	nr_frags;

	unsigned char	nr_frags;

	__u8		tx_flags;

	unsigned short	gso_size;

	/* Warning: this field is not always filled in (UFO)! */

	unsigned short	gso_segs;

	unsigned short  gso_type;

	__be32          ip6_frag_id;

	__u8		tx_flags;

	struct sk_buff	*frag_list;

	struct skb_shared_hwtstamps hwtstamps;

	__be32          ip6_frag_id;



	/*

	 * Warning : all fields before dataref are cleared in __alloc_skb()