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[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>
This commit is contained in:
shemminger@osdl.org 2006-08-28 10:00:50 -07:00 committed by Jeff Garzik
parent e07560cd4f
commit 1d179332f8
2 changed files with 13 additions and 6 deletions
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17
drivers/net/sky2.c
View File

@ -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);

2
drivers/net/sky2.h
View File

@ -1843,6 +1843,8 @@ struct sky2_port {
u32 tx_addr64;
u16 tx_pending;
u16 tx_last_mss;
u16 tx_csum_start;
u16 tx_csum_offset;
struct ring_info *rx_ring ____cacheline_aligned_in_smp;
struct sky2_rx_le *rx_le;