[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>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 7fdf84dee73f..b8e8914cc002 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -51,6 +51,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
         int clen;
         int alen;
         int nfrags;
+        u8 *tail;
         struct esp_data *esp = x->data;
         int hdr_len = (skb_transport_offset(skb) +
                        sizeof(*esph) + esp->conf.ivlen);
@@ -78,18 +79,19 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
         }
 
         /* Fill padding... */
+        tail = skb_tail_pointer(trailer);
         do {
                 int i;
                 for (i=0; i<clen-skb->len - 2; i++)
-                        *(u8*)(trailer->tail + i) = i+1;
+                        tail[i] = i + 1;
         } while (0);
-        *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
+        tail[clen-skb->len - 2] = (clen - skb->len) - 2;
         pskb_put(skb, trailer, clen - skb->len);
 
         top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
         esph = (struct ipv6_esp_hdr *)skb_transport_header(skb);
         top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
-        *(u8 *)(trailer->tail - 1) = *skb_network_header(skb);
+        *(skb_tail_pointer(skb) - 1) = *skb_network_header(skb);
         *skb_network_header(skb) = IPPROTO_ESP;
 
         esph->spi = x->id.spi;