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| author | Michal Kubeček <mkubecek@suse.cz> | 2014-05-20 08:29:25 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-05-22 15:07:23 -0400 |
| commit | da08143b85203b581f4a6461b149186b0e9592df (patch) | |
| tree | 92f3c5efc8225ddd941f0c80ac8c7caa8ed5211f /net/8021q | |
| parent | 98a6eeb8f5dbae8012cd4ec7b6c13efd5b5ced8a (diff) | |
| download | linux-stable-da08143b85203b581f4a6461b149186b0e9592df.tar.gz linux-stable-da08143b85203b581f4a6461b149186b0e9592df.tar.bz2 linux-stable-da08143b85203b581f4a6461b149186b0e9592df.zip | |
vlan: more careful checksum features handling
When combining real_dev's features and vlan_features, simple
bitwise AND is used. This doesn't work well for checksum
offloading features as if one set has NETIF_F_HW_CSUM and the
other NETIF_F_IP_CSUM and/or NETIF_F_IPV6_CSUM, we end up with
no checksum offloading. However, from the logical point of view
(how can_checksum_protocol() works), NETIF_F_HW_CSUM contains
the functionality of NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM so
that the result should be IP/IPV6.
Add helper function netdev_intersect_features() implementing
this logic and use it in vlan_dev_fix_features().
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/8021q')
| -rw-r--r-- | net/8021q/vlan_dev.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c index 8f025afa29fd..4181fb71ba77 100644 --- a/net/8021q/vlan_dev.c +++ b/net/8021q/vlan_dev.c @@ -678,9 +678,9 @@ static netdev_features_t vlan_dev_fix_features(struct net_device *dev, struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; netdev_features_t old_features = features; - features &= real_dev->vlan_features; + features = netdev_intersect_features(features, real_dev->vlan_features); features |= NETIF_F_RXCSUM; - features &= real_dev->features; + features = netdev_intersect_features(features, real_dev->features); features |= old_features & NETIF_F_SOFT_FEATURES; features |= NETIF_F_LLTX; |