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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 /net/ipv4/igmp.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
downloadop-kernel-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.zip
op-kernel-dev-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.gz
[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 'net/ipv4/igmp.c')
-rw-r--r--net/ipv4/igmp.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 1fc637f..2506021 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -348,8 +348,8 @@ static int igmpv3_sendpack(struct sk_buff *skb)
{
struct iphdr *pip = ip_hdr(skb);
struct igmphdr *pig = igmp_hdr(skb);
- const int iplen = skb->tail - skb_network_header(skb);
- const int igmplen = skb->tail - skb_transport_header(skb);
+ const int iplen = skb->tail - skb->network_header;
+ const int igmplen = skb->tail - skb->transport_header;
pip->tot_len = htons(iplen);
ip_send_check(pip);
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