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authorJesse Gross <jesse@nicira.com>2011-01-09 06:23:31 +0000
committerDavid S. Miller <davem@davemloft.net>2011-01-09 23:35:33 -0800
commitf01a5236bd4b140198fbcc550f085e8361fd73fa (patch)
tree01d122dcd3aa7e8e1f84f11f74f5c30593a5f850 /net/core
parent9497a0518e8183959e45da05f317f1cb36f2cd7c (diff)
downloadlinux-2.6.38-lt-ux500-f01a5236bd4b140198fbcc550f085e8361fd73fa.tar.gz
net offloading: Generalize netif_get_vlan_features().
netif_get_vlan_features() is currently only used by netif_needs_gso(), so it only concerns itself with GSO features. However, several other places also should take into account the contents of the packet when deciding whether to offload to hardware. This generalizes the function to return features about all of the various forms of offloading. Since offloads tend to be linked together, this avoids duplicating the logic in each location (i.e. the scatter/gather code also needs the checksum logic). Suggested-by: Michał Mirosław <mirqus@gmail.com> Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-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: