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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-19 20:29:13 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:26:28 -0700
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /include/linux/rtnetlink.h
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
[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/rtnetlink.h')
-rw-r--r--include/linux/rtnetlink.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 4a629ea70cc4..3a4cb242ecd2 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -605,7 +605,7 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
#define RTA_PUT_NOHDR(skb, attrlen, data) \
({ RTA_APPEND(skb, RTA_ALIGN(attrlen), data); \
- memset(skb->tail - (RTA_ALIGN(attrlen) - attrlen), 0, \
+ memset(skb_tail_pointer(skb) - (RTA_ALIGN(attrlen) - attrlen), 0, \
RTA_ALIGN(attrlen) - attrlen); })
#define RTA_PUT_U8(skb, attrtype, value) \
@@ -637,12 +637,12 @@ extern void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const voi
RTA_PUT(skb, attrtype, 0, NULL);
#define RTA_NEST(skb, type) \
-({ struct rtattr *__start = (struct rtattr *) (skb)->tail; \
+({ struct rtattr *__start = (struct rtattr *)skb_tail_pointer(skb); \
RTA_PUT(skb, type, 0, NULL); \
__start; })
#define RTA_NEST_END(skb, start) \
-({ (start)->rta_len = ((skb)->tail - (unsigned char *) (start)); \
+({ (start)->rta_len = skb_tail_pointer(skb) - (unsigned char *)(start); \
(skb)->len; })
#define RTA_NEST_CANCEL(skb, start) \