[PATCH net] net: fix checksum features handling in netif_skb_features()

From: Michal Kubecek
Date: Fri Aug 15 2014 - 05:56:25 EST


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@xxxxxxx>
---
net/core/dev.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index b65a505..75f0096 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2587,13 +2587,18 @@ 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);
}
--
1.8.4.5

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