net: fix checksum features handling in netif_skb_features()

This is follow-up to

  da08143b8520 ("vlan: more careful checksum features handling")

which introduced more careful feature intersection in vlan code,
taking into account that HW_CSUM should be considered superset
of IP_CSUM/IPV6_CSUM. The same is needed in netif_skb_features()
in order to avoid offloading mismatch warning when vlan is
created on top of a bond consisting of slaves supporting IP/IPv6
checksumming but not vlan Tx offloading.

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 5 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 66738e9d66e4..ab9a16530c36 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2587,13 +2587,19 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
                 return harmonize_features(skb, features);
         }
 
-        features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX |
-                                               NETIF_F_HW_VLAN_STAG_TX);
+        features = netdev_intersect_features(features,
+                                             skb->dev->vlan_features |
+                                             NETIF_F_HW_VLAN_CTAG_TX |
+                                             NETIF_F_HW_VLAN_STAG_TX);
 
         if (protocol == htons(ETH_P_8021Q) || protocol == htons(ETH_P_8021AD))
-                features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
-                                NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_CTAG_TX |
-                                NETIF_F_HW_VLAN_STAG_TX;
+                features = netdev_intersect_features(features,
+                                                     NETIF_F_SG |
+                                                     NETIF_F_HIGHDMA |
+                                                     NETIF_F_FRAGLIST |
+                                                     NETIF_F_GEN_CSUM |
+                                                     NETIF_F_HW_VLAN_CTAG_TX |
+                                                     NETIF_F_HW_VLAN_STAG_TX);
 
         return harmonize_features(skb, features);
 }