net: Move check for multiple vlans to drivers

To allow drivers to handle the features check for multiple tags,
move the check to ndo_features_check().
As no drivers currently handle multiple tagged TSO, introduce
dflt_features_check() and call it if the driver does not have
ndo_features_check().

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 9677431..039b0c1 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -12557,6 +12557,7 @@ static netdev_features_t bnx2x_features_check(struct sk_buff *skb,
                                              struct net_device *dev,
                                              netdev_features_t features)
 {
+       features = vlan_features_check(skb, features);
        return vxlan_features_check(skb, features);
 }
 

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index a8339e9..ebc93a1 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2373,6 +2373,7 @@ static netdev_features_t mlx4_en_features_check(struct sk_buff *skb,
                                                struct net_device *dev,
                                                netdev_features_t features)
 {
+       features = vlan_features_check(skb, features);
        return vxlan_features_check(skb, features);
 }
 #endif

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index a430a34..367f397 100644 (file)
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -507,6 +507,7 @@ static netdev_features_t qlcnic_features_check(struct sk_buff *skb,
                                               struct net_device *dev,
                                               netdev_features_t features)
 {
+       features = vlan_features_check(skb, features);
        return vxlan_features_check(skb, features);
 }
 #endif

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 4265d44..920e445 100644 (file)
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -606,4 +606,26 @@ static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
        return true;
 }
 
+/**
+ * vlan_features_check - drop unsafe features for skb with multiple tags.
+ * @skb: skbuff to query
+ * @features: features to be checked
+ *
+ * Returns features without unsafe ones if the skb has multiple tags.
+ */
+static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
+                                                   netdev_features_t features)
+{
+       if (skb_vlan_tagged_multi(skb))
+               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 features;
+}
+
 #endif /* !(_LINUX_IF_VLAN_H_) */

diff --git a/net/core/dev.c b/net/core/dev.c
index 04bffcd..cb46bad 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2562,6 +2562,13 @@ static netdev_features_t harmonize_features(struct sk_buff *skb,
        return features;
 }
 
+static netdev_features_t dflt_features_check(const struct sk_buff *skb,
+                                            struct net_device *dev,
+                                            netdev_features_t features)
+{
+       return vlan_features_check(skb, features);
+}
+
 netdev_features_t netif_skb_features(struct sk_buff *skb)
 {
        struct net_device *dev = skb->dev;
@@ -2583,22 +2590,12 @@ netdev_features_t netif_skb_features(struct sk_buff *skb)
                                                     dev->vlan_features |
                                                     NETIF_F_HW_VLAN_CTAG_TX |
                                                     NETIF_F_HW_VLAN_STAG_TX);
-       else
-               goto finalize;
 
-       if (skb_vlan_tagged_multi(skb))
-               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);
-
-finalize:
        if (dev->netdev_ops->ndo_features_check)
                features &= dev->netdev_ops->ndo_features_check(skb, dev,
                                                                features);
+       else
+               features &= dflt_features_check(skb, dev, features);
 
        return harmonize_features(skb, features);
 }