diff options
Diffstat (limited to 'datapath/linux/compat/netdevice.c')
| -rw-r--r-- | datapath/linux/compat/netdevice.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/datapath/linux/compat/netdevice.c b/datapath/linux/compat/netdevice.c index 1a6f327ad..91855c47a 100644 --- a/datapath/linux/compat/netdevice.c +++ b/datapath/linux/compat/netdevice.c @@ -1,5 +1,6 @@ #include <linux/if_link.h> #include <linux/netdevice.h> +#include <linux/if_vlan.h> /* Linux 2.6.28 introduced dev_get_stats(): * const struct net_device_stats *dev_get_stats(struct net_device *dev); @@ -47,3 +48,101 @@ struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, return storage; } #endif /* kernel version < 2.6.36 */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static bool can_checksum_protocol(unsigned long features, __be16 protocol) +{ + return ((features & NETIF_F_GEN_CSUM) || + ((features & NETIF_F_V4_CSUM) && + protocol == htons(ETH_P_IP)) || + ((features & NETIF_F_V6_CSUM) && + protocol == htons(ETH_P_IPV6)) || + ((features & NETIF_F_FCOE_CRC) && + protocol == htons(ETH_P_FCOE))); +} + +static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) +{ +#ifdef CONFIG_HIGHMEM + int i; + + if (dev->features & NETIF_F_HIGHDMA) + return 0; + + for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) + if (PageHighMem(skb_shinfo(skb)->frags[i].page)) + return 1; + +#endif + return 0; +} + +static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features) +{ + if (!can_checksum_protocol(features, protocol)) { + features &= ~NETIF_F_ALL_CSUM; + features &= ~NETIF_F_SG; + } else if (illegal_highdma(skb->dev, skb)) { + features &= ~NETIF_F_SG; + } + + return features; +} + +u32 rpl_netif_skb_features(struct sk_buff *skb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26) + unsigned long vlan_features = 0; +#else + unsigned long vlan_features = skb->dev->vlan_features; +#endif /* kernel version < 2.6.26 */ + + __be16 protocol = skb->protocol; + u32 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 (!vlan_tx_tag_present(skb)) { + return harmonize_features(skb, protocol, features); + } + + features &= (vlan_features | NETIF_F_HW_VLAN_TX); + + 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 | NETIF_F_HW_VLAN_TX; + return harmonize_features(skb, protocol, features); + } +} + +struct sk_buff *rpl_skb_gso_segment(struct sk_buff *skb, u32 features) +{ + int vlan_depth = ETH_HLEN; + __be16 type = skb->protocol; + __be16 skb_proto; + struct sk_buff *skb_gso; + + while (type == htons(ETH_P_8021Q)) { + struct vlan_hdr *vh; + + if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) + return ERR_PTR(-EINVAL); + + vh = (struct vlan_hdr *)(skb->data + vlan_depth); + type = vh->h_vlan_encapsulated_proto; + vlan_depth += VLAN_HLEN; + } + + /* this hack needed to get regular skb_gso_segment() */ +#undef skb_gso_segment + skb_proto = skb->protocol; + skb->protocol = type; + + skb_gso = skb_gso_segment(skb, features); + skb->protocol = skb_proto; + return skb_gso; +} +#endif /* kernel version < 2.6.38 */ |