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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-04-20 07:29:13 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-26 09:26:28 +0400
commit27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26 (patch)
tree5a267e40f9b94014be38dad5de0a52b6628834e0 /drivers/atm/nicstar.c
parentbe8bd86321fa7f06359d866ef61fb4d2f3e9dce9 (diff)
downloadlinux-27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26.tar.xz
[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/atm/nicstar.c')
-rw-r--r--drivers/atm/nicstar.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/atm/nicstar.c b/drivers/atm/nicstar.c
index aab9b3733d52..26f4b7033494 100644
--- a/drivers/atm/nicstar.c
+++ b/drivers/atm/nicstar.c
@@ -2208,7 +2208,7 @@ static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
if (i == 1 && ns_rsqe_eopdu(rsqe))
*((u32 *) sb->data) |= 0x00000002;
skb_put(sb, NS_AAL0_HEADER);
- memcpy(sb->tail, cell, ATM_CELL_PAYLOAD);
+ memcpy(skb_tail_pointer(sb), cell, ATM_CELL_PAYLOAD);
skb_put(sb, ATM_CELL_PAYLOAD);
ATM_SKB(sb)->vcc = vcc;
__net_timestamp(sb);
@@ -2252,7 +2252,8 @@ static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
vc->rx_iov = iovb;
NS_SKB(iovb)->iovcnt = 0;
iovb->len = 0;
- iovb->tail = iovb->data = iovb->head;
+ iovb->data = iovb->head;
+ skb_reset_tail_pointer(iovb);
NS_SKB(iovb)->vcc = vcc;
/* IMPORTANT: a pointer to the sk_buff containing the small or large
buffer is stored as iovec base, NOT a pointer to the
@@ -2265,7 +2266,8 @@ static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
recycle_iovec_rx_bufs(card, (struct iovec *) iovb->data, NS_MAX_IOVECS);
NS_SKB(iovb)->iovcnt = 0;
iovb->len = 0;
- iovb->tail = iovb->data = iovb->head;
+ iovb->data = iovb->head;
+ skb_reset_tail_pointer(iovb);
NS_SKB(iovb)->vcc = vcc;
}
iov = &((struct iovec *) iovb->data)[NS_SKB(iovb)->iovcnt++];
@@ -2489,7 +2491,7 @@ static void dequeue_rx(ns_dev *card, ns_rsqe *rsqe)
{
lb = (struct sk_buff *) iov->iov_base;
tocopy = min_t(int, remaining, iov->iov_len);
- memcpy(hb->tail, lb->data, tocopy);
+ memcpy(skb_tail_pointer(hb), lb->data, tocopy);
skb_put(hb, tocopy);
iov++;
remaining -= tocopy;