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net: fec: Enable IP header hardware checksum 

IP header checksum is calcalated by network layer in default.
To support software TSO, it is better to use HW calculate the
IP header checksum.

FEC hw checksum feature request the checksum field in frame
is zero, otherwise the calculative CRC is not correct.

For segmentated TCP packet, HW calculate the IP header checksum again,
it doesn't bring any impact. For SW TSO, HW calculated checksum bring
better performance.

Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nimrod Andy 2014-06-12 08:16:19 +08:00 committed by David S. Miller
parent 61a4427b95
commit 96c50caa51
1 changed files with 2 additions and 1 deletions
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3
drivers/net/ethernet/freescale/fec_main.c
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@ -314,6 +314,7 @@ fec_enet_clear_csum(struct sk_buff *skb, struct net_device *ndev)
if (unlikely(skb_cow_head(skb, 0)))
return -1;
ip_hdr(skb)->check = 0;
*(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) = 0;
return 0;
@ -395,7 +396,7 @@ static int txq_submit_skb(struct sk_buff *skb, struct net_device *ndev)
* are done by the kernel
*/
if (skb->ip_summed == CHECKSUM_PARTIAL)
ebdp->cbd_esc |= BD_ENET_TX_PINS;
ebdp->cbd_esc |= BD_ENET_TX_PINS | BD_ENET_TX_IINS;
}
}