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[SK_BUFF]: Convert skb->tail to sk_buff_data_t

Telusuri Sumber 
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>
This commit is contained in:
Arnaldo Carvalho de Melo
2007-04-19 20:29:13 -07:00
committed by David S. Miller
orang tua be8bd86321
melakukan 27a884dc3c
110 mengubah file dengan 396 tambahan dan 329 penghapusan
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8
net/sched/act_police.c
Melihat File

@@ -80,7 +80,7 @@ static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *c
continue;
a->priv = p;
a->order = index;
r = (struct rtattr*) skb->tail;
r = (struct rtattr *)skb_tail_pointer(skb);
RTA_PUT(skb, a->order, 0, NULL);
if (type == RTM_DELACTION)
err = tcf_action_dump_1(skb, a, 0, 1);
@@ -91,7 +91,7 @@ static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *c
skb_trim(skb, (u8*)r - skb->data);
goto done;
}
r->rta_len = skb->tail - (u8*)r;
r->rta_len = skb_tail_pointer(skb) - (u8 *)r;
n_i++;
}
}
@@ -326,7 +326,7 @@ static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
static int
tcf_act_police_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
unsigned char *b = skb->tail;
unsigned char *b = skb_tail_pointer(skb);
struct tcf_police *police = a->priv;
struct tc_police opt;
@@ -572,7 +572,7 @@ EXPORT_SYMBOL(tcf_police);
int tcf_police_dump(struct sk_buff *skb, struct tcf_police *police)
{
unsigned char *b = skb->tail;
unsigned char *b = skb_tail_pointer(skb);
struct tc_police opt;
opt.index = police->tcf_index;