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[SK_BUFF]: Convert skb->tail to sk_buff_data_t

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So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)

Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2007-04-19 20:29:13 -07:00 • committed by David S. Miller
parent be8bd86321
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
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2
include/linux/netlink.h
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@ -229,7 +229,7 @@ __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags)
(cb)->nlh->nlmsg_seq, type, len, flags)
#define NLMSG_END(skb, nlh) \
({ (nlh)->nlmsg_len = (skb)->tail - (unsigned char *) (nlh); \
({ (nlh)->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)(nlh); \
(skb)->len; })
#define NLMSG_CANCEL(skb, nlh) \