Commit da08143b authored by Michal Kubeček's avatar Michal Kubeček Committed by David S. Miller

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: default avatarMichal Kubecek <mkubecek@suse.cz>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 98a6eeb8
...@@ -3153,6 +3153,20 @@ const char *netdev_drivername(const struct net_device *dev); ...@@ -3153,6 +3153,20 @@ const char *netdev_drivername(const struct net_device *dev);
void linkwatch_run_queue(void); void linkwatch_run_queue(void);
static inline netdev_features_t netdev_intersect_features(netdev_features_t f1,
netdev_features_t f2)
{
if (f1 & NETIF_F_GEN_CSUM)
f1 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
if (f2 & NETIF_F_GEN_CSUM)
f2 |= (NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
f1 &= f2;
if (f1 & NETIF_F_GEN_CSUM)
f1 &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
return f1;
}
static inline netdev_features_t netdev_get_wanted_features( static inline netdev_features_t netdev_get_wanted_features(
struct net_device *dev) struct net_device *dev)
{ {
......
...@@ -678,9 +678,9 @@ static netdev_features_t vlan_dev_fix_features(struct net_device *dev, ...@@ -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; struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
netdev_features_t old_features = features; 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 |= NETIF_F_RXCSUM;
features &= real_dev->features; features = netdev_intersect_features(features, real_dev->features);
features |= old_features & NETIF_F_SOFT_FEATURES; features |= old_features & NETIF_F_SOFT_FEATURES;
features |= NETIF_F_LLTX; features |= NETIF_F_LLTX;
......
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