[net-next PATCH v2 1/9] net: Disable segmentation if checksumming is not supported

[Alexander Duyck]

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 <adu...@mirantis.com>
---
 net/core/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index d91dfbec0fc6..673d1f118bfb 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2815,7 +2815,7 @@ 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;
        }