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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/core/gen_stats.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
downloadlinux-2.6.38-lt-ux500-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.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/core/gen_stats.c')
-rw-r--r--net/core/gen_stats.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c
index 259473d0559..bcc25591d8a 100644
--- a/net/core/gen_stats.c
+++ b/net/core/gen_stats.c
@@ -61,7 +61,7 @@ gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type,
spin_lock_bh(lock);
d->lock = lock;
if (type)
- d->tail = (struct rtattr *) skb->tail;
+ d->tail = (struct rtattr *)skb_tail_pointer(skb);
d->skb = skb;
d->compat_tc_stats = tc_stats_type;
d->compat_xstats = xstats_type;
@@ -212,7 +212,7 @@ int
gnet_stats_finish_copy(struct gnet_dump *d)
{
if (d->tail)
- d->tail->rta_len = d->skb->tail - (u8 *) d->tail;
+ d->tail->rta_len = skb_tail_pointer(d->skb) - (u8 *)d->tail;
if (d->compat_tc_stats)
if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats,