1 #include <linux/netdevice.h>
2 #include <linux/if_vlan.h>
7 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
8 #ifndef HAVE_CAN_CHECKSUM_PROTOCOL
9 static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
11 return ((features & NETIF_F_GEN_CSUM) ||
12 ((features & NETIF_F_V4_CSUM) &&
13 protocol == htons(ETH_P_IP)) ||
14 ((features & NETIF_F_V6_CSUM) &&
15 protocol == htons(ETH_P_IPV6)) ||
16 ((features & NETIF_F_FCOE_CRC) &&
17 protocol == htons(ETH_P_FCOE)));
21 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
26 if (dev->features & NETIF_F_HIGHDMA)
29 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
30 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
37 static netdev_features_t harmonize_features(struct sk_buff *skb,
39 netdev_features_t features)
41 if (!can_checksum_protocol(features, protocol)) {
42 features &= ~NETIF_F_ALL_CSUM;
43 features &= ~NETIF_F_SG;
44 } else if (illegal_highdma(skb->dev, skb)) {
45 features &= ~NETIF_F_SG;
51 netdev_features_t rpl_netif_skb_features(struct sk_buff *skb)
53 unsigned long vlan_features = skb->dev->vlan_features;
55 __be16 protocol = skb->protocol;
56 netdev_features_t features = skb->dev->features;
58 if (protocol == htons(ETH_P_8021Q)) {
59 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
60 protocol = veh->h_vlan_encapsulated_proto;
61 } else if (!skb_vlan_tag_present(skb)) {
62 return harmonize_features(skb, protocol, features);
65 features &= (vlan_features | NETIF_F_HW_VLAN_TX);
67 if (protocol != htons(ETH_P_8021Q)) {
68 return harmonize_features(skb, protocol, features);
70 features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
71 NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
72 return harmonize_features(skb, protocol, features);
75 EXPORT_SYMBOL_GPL(rpl_netif_skb_features);
76 #endif /* kernel version < 2.6.38 */
78 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0)
79 struct sk_buff *rpl_skb_gso_segment(struct sk_buff *skb,
80 netdev_features_t features)
82 int vlan_depth = ETH_HLEN;
83 __be16 type = skb->protocol;
85 struct sk_buff *skb_gso;
87 while (type == htons(ETH_P_8021Q)) {
90 if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
91 return ERR_PTR(-EINVAL);
93 vh = (struct vlan_hdr *)(skb->data + vlan_depth);
94 type = vh->h_vlan_encapsulated_proto;
95 vlan_depth += VLAN_HLEN;
99 type = ovs_skb_get_inner_protocol(skb);
101 /* this hack needed to get regular skb_gso_segment() */
102 #undef skb_gso_segment
103 skb_proto = skb->protocol;
104 skb->protocol = type;
106 skb_gso = skb_gso_segment(skb, features);
107 skb->protocol = skb_proto;
110 EXPORT_SYMBOL_GPL(rpl_skb_gso_segment);
112 #endif /* kernel version < 3.16.0 */