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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-20 05:29:13 +0200
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 07:26:28 +0200
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /drivers/net/ibm_emac
parent[VLAN] vlan_dev: Use skb_reset_network_header(). (diff)
downloadlinux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz
linux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.zip
[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/net/ibm_emac')
-rw-r--r--drivers/net/ibm_emac/ibm_emac_core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ibm_emac/ibm_emac_core.c b/drivers/net/ibm_emac/ibm_emac_core.c
index b1ad62d89eb9..3d82d46f4998 100644
--- a/drivers/net/ibm_emac/ibm_emac_core.c
+++ b/drivers/net/ibm_emac/ibm_emac_core.c
@@ -1338,7 +1338,7 @@ static inline int emac_rx_sg_append(struct ocp_enet_private *dev, int slot)
dev_kfree_skb(dev->rx_sg_skb);
dev->rx_sg_skb = NULL;
} else {
- cacheable_memcpy(dev->rx_sg_skb->tail,
+ cacheable_memcpy(skb_tail_pointer(dev->rx_sg_skb),
dev->rx_skb[slot]->data, len);
skb_put(dev->rx_sg_skb, len);
emac_recycle_rx_skb(dev, slot, len);