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[PATCH] sky2: TSO mss optimization

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The MSS in the transmit engine only has to change if TSO mtu changes. This
means less commands to the chip when mixing TSO and regular data.

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 10:00:49 -07:00 committed by Jeff Garzik
parent bb507fe11f
commit e07560cd4f
1 changed files with 9 additions and 9 deletions
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18
drivers/net/sky2.c
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@ -1244,15 +1244,15 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
mss += ((skb->h.th->doff - 5) * 4); /* TCP options */
mss += (skb->nh.iph->ihl * 4) + sizeof(struct tcphdr);
mss += ETH_HLEN;
}
if (mss != sky2->tx_last_mss) {
le = get_tx_le(sky2);
le->tx.tso.size = cpu_to_le16(mss);
le->tx.tso.rsvd = 0;
le->opcode = OP_LRGLEN | HW_OWNER;
le->ctrl = 0;
sky2->tx_last_mss = mss;
if (mss != sky2->tx_last_mss) {
le = get_tx_le(sky2);
le->tx.tso.size = cpu_to_le16(mss);
le->tx.tso.rsvd = 0;
le->opcode = OP_LRGLEN | HW_OWNER;
le->ctrl = 0;
sky2->tx_last_mss = mss;
}
}
ctrl = 0;
@ -1320,7 +1320,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
le->opcode = OP_BUFFER | HW_OWNER;
fre = sky2->tx_ring
+ RING_NEXT((re - sky2->tx_ring) + i, TX_RING_SIZE);
+ RING_NEXT((re - sky2->tx_ring) + i, TX_RING_SIZE);
pci_unmap_addr_set(fre, mapaddr, mapping);
}