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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2007-04-20 05:29:13 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 07:26:28 +0200 |
| commit | 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch) | |
| tree | 5a267e40f9b94014be38dad5de0a52b6628834e0 /include/net/netlink.h | |
| parent | [VLAN] vlan_dev: Use skb_reset_network_header(). (diff) | |
| download | linux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz linux-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/net/netlink.h')
| -rw-r--r-- | include/net/netlink.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index bcaf67b7a19d..2c7ab107f20d 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -525,7 +525,7 @@ static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) */ static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) { - nlh->nlmsg_len = skb->tail - (unsigned char *) nlh; + nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; return skb->len; } @@ -538,7 +538,7 @@ static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) */ static inline void *nlmsg_get_pos(struct sk_buff *skb) { - return skb->tail; + return skb_tail_pointer(skb); } /** @@ -940,7 +940,7 @@ static inline unsigned long nla_get_msecs(struct nlattr *nla) */ static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) { - struct nlattr *start = (struct nlattr *) skb->tail; + struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); if (nla_put(skb, attrtype, 0, NULL) < 0) return NULL; @@ -960,7 +960,7 @@ static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) */ static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) { - start->nla_len = skb->tail - (unsigned char *) start; + start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; return skb->len; } |