net/core/tso.c

5 #include <net/tso.h>
8 void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
11 	int hdr_len = skb_transport_offset(skb) + tso->tlen;
15 	if (!tso->ipv6) {
18 		iph->id = htons(tso->ip_id);
20 		tso->ip_id++;
24 		iph->payload_len = htons(size + tso->tlen);
27 	if (tso->tlen != sizeof(struct udphdr)) {
30 		put_unaligned_be32(tso->tcp_seq, &tcph->seq);
46 void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size)
48 	tso->tcp_seq += size; /* not worth avoiding this operation for UDP */
49 	tso->size -= size;
50 	tso->data += size;
52 	if ((tso->size == 0) &&
53 	    (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
54 		skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];
57 		tso->size = skb_frag_size(frag);
58 		tso->data = skb_frag_address(frag);
59 		tso->next_frag_idx++;
64 int tso_start(struct sk_buff *skb, struct tso_t *tso)
69 	tso->tlen = tlen;
70 	tso->ip_id = ntohs(ip_hdr(skb)->id);
71 	tso->tcp_seq = (tlen != sizeof(struct udphdr)) ? ntohl(tcp_hdr(skb)->seq) : 0;
72 	tso->next_frag_idx = 0;
73 	tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);
76 	tso->size = skb_headlen(skb) - hdr_len;
77 	tso->data = skb->data + hdr_len;
78 	if ((tso->size == 0) &&
79 	    (tso->next_frag_idx < skb_shinfo(skb)->nr_frags)) {
80 		skb_frag_t *frag = &skb_shinfo(skb)->frags[tso->next_frag_idx];
83 		tso->size = skb_frag_size(frag);
84 		tso->data = skb_frag_address(frag);
85 		tso->next_frag_idx++;