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[NET]: Reduce size of sk_buff by 4 bytes

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Reduce local_df to a bit field and ip_summed to a 2 bits
field thus saving 13 bits. Move bit fields, packet type,
and protocol into the spare area between the priority
and the destructor. Saves 4 bytes on both, 32bit and
64bit architectures.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2005-07-05 14:13:41 -07:00 committed by David S. Miller
parent e176fe8954
commit 1cbb3380ef
1 changed files with 8 additions and 7 deletions
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15
include/linux/skbuff.h
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@ -248,17 +248,18 @@ struct sk_buff {
data_len,
mac_len,
csum;
unsigned char local_df,
cloned:1,
nohdr:1,
pkt_type,
ip_summed;
__u32 priority;
unsigned short protocol;
__u8 local_df:1,
cloned:1,
ip_summed:2,
nohdr:1;
/* 3 bits spare */
__u8 pkt_type;
__u16 protocol;
void (*destructor)(struct sk_buff *skb);
#ifdef CONFIG_NETFILTER
unsigned long nfmark;
unsigned long nfmark;
__u32 nfcache;
__u32 nfctinfo;
struct nf_conntrack *nfct;