From: Daniel Hellstrom <daniel@gaisler.com>
Date: Fri, 9 Sep 2011 05:17:54 +0000 (+0000)
Subject: GRETH: avoid overwrite IP-stack's IP-frags checksum
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d706f00f65146822c0097b796b3557ea8980c305;p=linux.git

GRETH: avoid overwrite IP-stack's IP-frags checksum

The GRETH GBIT core does not do checksum offloading for IP
segmentation. This patch adds a check in the xmit function to
determine if the stack has calculated the checksum for us.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/greth.c b/drivers/net/greth.c
index 58ec74a731501..52a39000c42c7 100644
--- a/drivers/net/greth.c
+++ b/drivers/net/greth.c
@@ -491,7 +491,8 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 	if (nr_frags != 0)
 		status = GRETH_TXBD_MORE;
 
-	status |= GRETH_TXBD_CSALL;
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		status |= GRETH_TXBD_CSALL;
 	status |= skb_headlen(skb) & GRETH_BD_LEN;
 	if (greth->tx_next == GRETH_TXBD_NUM_MASK)
 		status |= GRETH_BD_WR;
@@ -514,7 +515,9 @@ greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
 		greth->tx_skbuff[curr_tx] = NULL;
 		bdp = greth->tx_bd_base + curr_tx;
 
-		status = GRETH_TXBD_CSALL | GRETH_BD_EN;
+		status = GRETH_BD_EN;
+		if (skb->ip_summed == CHECKSUM_PARTIAL)
+			status |= GRETH_TXBD_CSALL;
 		status |= frag->size & GRETH_BD_LEN;
 
 		/* Wrap around descriptor ring */