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authorshemminger@osdl.org <shemminger@osdl.org>2006-08-28 10:00:50 -0700
committerJeff Garzik <jeff@garzik.org>2006-08-29 17:18:30 -0400
commit1d179332f8918a5f4e031dc068a469283b01c4c1 (patch)
tree004d7ec6faab91cc32609dbd2d2a9de33ec39be6 /drivers/net/sky2.c
parente07560cd4f762935968a1120168eb7d22260d85f (diff)
[PATCH] sky2: optimize checksum offload information
Since many packets have the same checksum starting offset and insertion location; the driver can save the last information and only tell hardware when it changes. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/sky2.c')
-rw-r--r--drivers/net/sky2.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index fe60f0462c9..eafb6327d68 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1280,12 +1280,17 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
if (skb->nh.iph->protocol == IPPROTO_UDP)
ctrl |= UDPTCP;
- le = get_tx_le(sky2);
- le->tx.csum.start = cpu_to_le16(hdr);
- le->tx.csum.offset = cpu_to_le16(offset);
- le->length = 0; /* initial checksum value */
- le->ctrl = 1; /* one packet */
- le->opcode = OP_TCPLISW | HW_OWNER;
+ if (hdr != sky2->tx_csum_start || offset != sky2->tx_csum_offset) {
+ sky2->tx_csum_start = hdr;
+ sky2->tx_csum_offset = offset;
+
+ le = get_tx_le(sky2);
+ le->tx.csum.start = cpu_to_le16(hdr);
+ le->tx.csum.offset = cpu_to_le16(offset);
+ le->length = 0; /* initial checksum value */
+ le->ctrl = 1; /* one packet */
+ le->opcode = OP_TCPLISW | HW_OWNER;
+ }
}
le = get_tx_le(sky2);