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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 /drivers/infiniband/hw/amso1100/c2.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
[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 'drivers/infiniband/hw/amso1100/c2.c')
-rw-r--r--drivers/infiniband/hw/amso1100/c2.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/amso1100/c2.c b/drivers/infiniband/hw/amso1100/c2.c
index 7698feafa6a..58bc272bd40 100644
--- a/drivers/infiniband/hw/amso1100/c2.c
+++ b/drivers/infiniband/hw/amso1100/c2.c
@@ -439,7 +439,8 @@ static void c2_rx_error(struct c2_port *c2_port, struct c2_element *elem)
}
/* Setup the skb for reuse since we're dropping this pkt */
- elem->skb->tail = elem->skb->data = elem->skb->head;
+ elem->skb->data = elem->skb->head;
+ skb_reset_tail_pointer(elem->skb);
/* Zero out the rxp hdr in the sk_buff */
memset(elem->skb->data, 0, sizeof(*rxp_hdr));
@@ -521,7 +522,7 @@ static void c2_rx_interrupt(struct net_device *netdev)
* "sizeof(struct c2_rxp_hdr)".
*/
skb->data += sizeof(*rxp_hdr);
- skb->tail = skb->data + buflen;
+ skb_set_tail_pointer(skb, buflen);
skb->len = buflen;
skb->protocol = eth_type_trans(skb, netdev);