-static int
-myri10ge_get_frag_header(struct skb_frag_struct *frag, void **mac_hdr,
- void **ip_hdr, void **tcpudp_hdr,
- u64 * hdr_flags, void *priv)
-{
- struct ethhdr *eh;
- struct vlan_ethhdr *veh;
- struct iphdr *iph;
- u8 *va = skb_frag_address(frag);
- unsigned long ll_hlen;
- /* passed opaque through lro_receive_frags() */
- __wsum csum = (__force __wsum) (unsigned long)priv;
-
- /* find the mac header, aborting if not IPv4 */
-
- eh = (struct ethhdr *)va;
- *mac_hdr = eh;
- ll_hlen = ETH_HLEN;
- if (eh->h_proto != htons(ETH_P_IP)) {
- if (eh->h_proto == htons(ETH_P_8021Q)) {
- veh = (struct vlan_ethhdr *)va;
- if (veh->h_vlan_encapsulated_proto != htons(ETH_P_IP))
- return -1;
-
- ll_hlen += VLAN_HLEN;
-
- /*
- * HW checksum starts ETH_HLEN bytes into
- * frame, so we must subtract off the VLAN
- * header's checksum before csum can be used
- */
- csum = csum_sub(csum, csum_partial(va + ETH_HLEN,
- VLAN_HLEN, 0));
- } else {
- return -1;
- }
- }
- *hdr_flags = LRO_IPV4;
-
- iph = (struct iphdr *)(va + ll_hlen);
- *ip_hdr = iph;
- if (iph->protocol != IPPROTO_TCP)
- return -1;
- if (ip_is_fragment(iph))
- return -1;
- *hdr_flags |= LRO_TCP;
- *tcpudp_hdr = (u8 *) (*ip_hdr) + (iph->ihl << 2);
-
- /* verify the IP checksum */
- if (unlikely(ip_fast_csum((u8 *) iph, iph->ihl)))
- return -1;
-
- /* verify the checksum */
- if (unlikely(csum_tcpudp_magic(iph->saddr, iph->daddr,
- ntohs(iph->tot_len) - (iph->ihl << 2),
- IPPROTO_TCP, csum)))
- return -1;
-
- return 0;
-}
-