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#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <net/mpls.h>
#include "gso.h"
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
#ifndef HAVE_CAN_CHECKSUM_PROTOCOL
static bool can_checksum_protocol(netdev_features_t 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)));
}
#endif
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 netdev_features_t harmonize_features(struct sk_buff *skb,
__be16 protocol,
netdev_features_t 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;
}
netdev_features_t rpl_netif_skb_features(struct sk_buff *skb)
{
unsigned long vlan_features = skb->dev->vlan_features;
__be16 protocol = skb->protocol;
netdev_features_t 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_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);
}
}
EXPORT_SYMBOL_GPL(rpl_netif_skb_features);
#endif /* kernel version < 2.6.38 */
#ifdef OVS_USE_COMPAT_GSO_SEGMENTATION
struct sk_buff *rpl__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features,
bool tx_path)
{
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;
}
if (eth_p_mpls(type))
type = ovs_skb_get_inner_protocol(skb);
/* this hack needed to get regular skb_gso_segment() */
skb_proto = skb->protocol;
skb->protocol = type;
#ifdef HAVE___SKB_GSO_SEGMENT
#undef __skb_gso_segment
skb_gso = __skb_gso_segment(skb, features, tx_path);
#else
#undef skb_gso_segment
skb_gso = skb_gso_segment(skb, features);
#endif
skb->protocol = skb_proto;
return skb_gso;
}
EXPORT_SYMBOL_GPL(rpl__skb_gso_segment);
#endif /* OVS_USE_COMPAT_GSO_SEGMENTATION */
#ifdef HAVE_UDP_OFFLOAD
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,0,0)
struct sk_buff **rpl_eth_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
struct sk_buff *p, **pp = NULL;
struct ethhdr *eh, *eh2;
unsigned int hlen, off_eth;
const struct packet_offload *ptype;
__be16 type;
int flush = 1;
off_eth = skb_gro_offset(skb);
hlen = off_eth + sizeof(*eh);
eh = skb_gro_header_fast(skb, off_eth);
if (skb_gro_header_hard(skb, hlen)) {
eh = skb_gro_header_slow(skb, hlen, off_eth);
if (unlikely(!eh))
goto out;
}
flush = 0;
for (p = *head; p; p = p->next) {
if (!NAPI_GRO_CB(p)->same_flow)
continue;
eh2 = (struct ethhdr *)(p->data + off_eth);
if (compare_ether_header(eh, eh2)) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
}
type = eh->h_proto;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (ptype == NULL) {
flush = 1;
goto out_unlock;
}
skb_gro_pull(skb, sizeof(*eh));
skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
pp = ptype->callbacks.gro_receive(head, skb);
out_unlock:
rcu_read_unlock();
out:
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
int rpl_eth_gro_complete(struct sk_buff *skb, int nhoff)
{
struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
__be16 type = eh->h_proto;
struct packet_offload *ptype;
int err = -ENOSYS;
if (skb->encapsulation)
skb_set_inner_mac_header(skb, nhoff);
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype != NULL)
err = ptype->callbacks.gro_complete(skb, nhoff +
sizeof(struct ethhdr));
rcu_read_unlock();
return err;
}
#endif
#endif /* HAVE_UDP_OFFLOAD */
#ifndef HAVE_RTNL_LINK_STATS64
#undef dev_get_stats
struct rtnl_link_stats64 *rpl_dev_get_stats(struct net_device *dev,
struct rtnl_link_stats64 *storage)
{
const struct net_device_stats *stats = dev_get_stats(dev);
#define copy(s) storage->s = stats->s
copy(rx_packets);
copy(tx_packets);
copy(rx_bytes);
copy(tx_bytes);
copy(rx_errors);
copy(tx_errors);
copy(rx_dropped);
copy(tx_dropped);
copy(multicast);
copy(collisions);
copy(rx_length_errors);
copy(rx_over_errors);
copy(rx_crc_errors);
copy(rx_frame_errors);
copy(rx_fifo_errors);
copy(rx_missed_errors);
copy(tx_aborted_errors);
copy(tx_carrier_errors);
copy(tx_fifo_errors);
copy(tx_heartbeat_errors);
copy(tx_window_errors);
copy(rx_compressed);
copy(tx_compressed);
#undef copy
return storage;
}
#endif
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