net: Disable all TSO features when SG is disabled

The feature flags NETIF_F_TSO and NETIF_F_TSO6 independently enable
TSO for IPv4 and IPv6 respectively.  However, the test in
netdev_fix_features() and its predecessor functions was never updated
to check for NETIF_F_TSO6, possibly because it was originally proposed
that TSO for IPv6 would be dependent on both feature flags.

Now that these feature flags can be changed independently from
user-space and we depend on netdev_fix_features() to fix invalid
feature combinations, it's important to disable them both if
scatter-gather is disabled.  Also disable NETIF_F_TSO_ECN so
user-space sees all TSO features as disabled.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 956d3b0..6401fb5 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5203,9 +5203,9 @@ u32 netdev_fix_features(struct net_device *dev, u32 features)
        }
 
        /* TSO requires that SG is present as well. */
-       if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
-               netdev_info(dev, "Dropping NETIF_F_TSO since no SG feature.\n");
-               features &= ~NETIF_F_TSO;
+       if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
+               netdev_info(dev, "Dropping TSO features since no SG feature.\n");
+               features &= ~NETIF_F_ALL_TSO;
        }
 
        /* Software GSO depends on SG. */