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-rw-r--r--net/core/dev.c35
1 files changed, 27 insertions, 8 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index d8befd06da0..a51dfd7b56f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2017,22 +2017,41 @@ static inline void skb_orphan_try(struct sk_buff *skb)
}
}
-int netif_get_vlan_features(struct sk_buff *skb, struct net_device *dev)
+static int harmonize_features(struct sk_buff *skb, __be16 protocol, int features)
+{
+ if (!can_checksum_protocol(protocol, features)) {
+ features &= ~NETIF_F_ALL_CSUM;
+ features &= ~NETIF_F_SG;
+ } else if (illegal_highdma(skb->dev, skb)) {
+ features &= ~NETIF_F_SG;
+ }
+
+ return features;
+}
+
+int netif_skb_features(struct sk_buff *skb)
{
__be16 protocol = skb->protocol;
+ int features = skb->dev->features;
if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
protocol = veh->h_vlan_encapsulated_proto;
- } else if (!skb->vlan_tci)
- return dev->features;
+ } else if (!vlan_tx_tag_present(skb)) {
+ return harmonize_features(skb, protocol, features);
+ }
- if (protocol != htons(ETH_P_8021Q))
- return dev->features & dev->vlan_features;
- else
- return 0;
+ features &= skb->dev->vlan_features;
+
+ if (protocol != htons(ETH_P_8021Q)) {
+ return harmonize_features(skb, protocol, features);
+ } else {
+ features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
+ NETIF_F_GEN_CSUM;
+ return harmonize_features(skb, protocol, features);
+ }
}
-EXPORT_SYMBOL(netif_get_vlan_features);
+EXPORT_SYMBOL(netif_skb_features);
/*
* Returns true if either: