- if (!(vsi->back->flags & I40E_FLAG_OUTER_UDP_CSUM_CAPABLE) &&
- (ipv4_tunnel)) {
- skb->transport_header = skb->mac_header +
- sizeof(struct ethhdr) +
- (ip_hdr(skb)->ihl * 4);
-
- /* Add 4 bytes for VLAN tagged packets */
- skb->transport_header += (skb->protocol == htons(ETH_P_8021Q) ||
- skb->protocol == htons(ETH_P_8021AD))
- ? VLAN_HLEN : 0;
-
- if ((ip_hdr(skb)->protocol == IPPROTO_UDP) &&
- (udp_hdr(skb)->check != 0)) {
- rx_udp_csum = udp_csum(skb);
- iph = ip_hdr(skb);
- csum = csum_tcpudp_magic(
- iph->saddr, iph->daddr,
- (skb->len - skb_transport_offset(skb)),
- IPPROTO_UDP, rx_udp_csum);
-
- if (udp_hdr(skb)->check != csum)
- goto checksum_fail;
-
- } /* else its GRE and so no outer UDP header */
- }