From: Alexander Duyck <aduyck@mirantis.com>
Date: Mon, 2 May 2016 16:25:10 +0000 (-0700)
Subject: net: Disable segmentation if checksumming is not supported
X-Git-Url: http://git.efficios.com/?p=deliverable%2Flinux.git;a=commitdiff_plain;h=996e802187889f1cd412e6929c9344b92ccb78c4

net: Disable segmentation if checksumming is not supported

In the case of the mlx4 and mlx5 driver they do not support IPv6 checksum
offload for tunnels.  With this being the case we should disable GSO in
addition to the checksum offload features when we find that a device cannot
perform a checksum on a given packet type.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 77a71cd68535..5c925ac50b95 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2802,7 +2802,7 @@ static netdev_features_t harmonize_features(struct sk_buff *skb,
 
 	if (skb->ip_summed != CHECKSUM_NONE &&
 	    !can_checksum_protocol(features, type)) {
-		features &= ~NETIF_F_CSUM_MASK;
+		features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 	} else if (illegal_highdma(skb->dev, skb)) {
 		features &= ~NETIF_F_SG;
 	}