diff options
| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2007-04-19 20:29:13 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:26:28 -0700 |
| commit | 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch) | |
| tree | 5a267e40f9b94014be38dad5de0a52b6628834e0 /include/linux/netfilter | |
| parent | [VLAN] vlan_dev: Use skb_reset_network_header(). (diff) | |
| download | linux-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz linux-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.zip | |
[SK_BUFF]: Convert skb->tail to sk_buff_data_t
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>
Diffstat (limited to 'include/linux/netfilter')
| -rw-r--r-- | include/linux/netfilter/nfnetlink.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h index 6179648a014e..e1ea5dfbbbd4 100644 --- a/include/linux/netfilter/nfnetlink.h +++ b/include/linux/netfilter/nfnetlink.h @@ -62,11 +62,11 @@ struct nfattr #define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0))) #define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0)) #define NFA_NEST(skb, type) \ -({ struct nfattr *__start = (struct nfattr *) (skb)->tail; \ +({ struct nfattr *__start = (struct nfattr *)skb_tail_pointer(skb); \ NFA_PUT(skb, (NFNL_NFA_NEST | type), 0, NULL); \ __start; }) #define NFA_NEST_END(skb, start) \ -({ (start)->nfa_len = ((skb)->tail - (unsigned char *) (start)); \ +({ (start)->nfa_len = skb_tail_pointer(skb) - (unsigned char *)(start); \ (skb)->len; }) #define NFA_NEST_CANCEL(skb, start) \ ({ if (start) \ |