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[SK_BUFF]: Convert skb->tail to sk_buff_data_t

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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
parent be8bd86321
commit 27a884dc3c
110 changed files with 396 additions and 329 deletions
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4
net/ipv6/netfilter/ip6_queue.c
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@@ -189,7 +189,7 @@ ipq_flush(int verdict)
static struct sk_buff *
ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
{
unsigned char *old_tail;
sk_buff_data_t old_tail;
size_t size = 0;
size_t data_len = 0;
struct sk_buff *skb;
@@ -233,7 +233,7 @@ ipq_build_packet_message(struct ipq_queue_entry *entry, int *errp)
if (!skb)
goto nlmsg_failure;
old_tail= skb->tail;
old_tail = skb->tail;
nlh = NLMSG_PUT(skb, 0, 0, IPQM_PACKET, size - sizeof(*nlh));
pmsg = NLMSG_DATA(nlh);
memset(pmsg, 0, sizeof(*pmsg));