Commit 3d5b459b authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: tso: add UDP segmentation support 



Note that like TCP, we do not support additional encapsulations,
and that checksums must be offloaded to the NIC.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 761b331c

net/core/tso.c

+18 −11
Original line number Diff line number Diff line
@@ -16,7 +16,6 @@ EXPORT_SYMBOL(tso_count_descs); 
void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,

		   int size, bool is_last)

{

	struct tcphdr *tcph;

	int hdr_len = skb_transport_offset(skb) + tso->tlen;

	int mac_hdr_len = skb_network_offset(skb);
@@ -32,7 +31,10 @@ void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso, 


		iph->payload_len = htons(size + tso->tlen);

	}

	tcph = (struct tcphdr *)(hdr + skb_transport_offset(skb));

	hdr += skb_transport_offset(skb);

	if (tso->tlen != sizeof(struct udphdr)) {

		struct tcphdr *tcph = (struct tcphdr *)hdr;



		put_unaligned_be32(tso->tcp_seq, &tcph->seq);



		if (!is_last) {
@@ -41,12 +43,17 @@ void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso, 
			tcph->fin = 0;

			tcph->rst = 0;

		}

	} else {

		struct udphdr *uh = (struct udphdr *)hdr;



		uh->len = htons(sizeof(*uh) + size);

	}

}

EXPORT_SYMBOL(tso_build_hdr);



void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size)

{

	tso->tcp_seq += size;

	tso->tcp_seq += size; /* not worth avoiding this operation for UDP */

	tso->size -= size;

	tso->data += size;
@@ -64,12 +71,12 @@ EXPORT_SYMBOL(tso_build_data); 


int tso_start(struct sk_buff *skb, struct tso_t *tso)

{

	int tlen = tcp_hdrlen(skb);

	int tlen = skb_is_gso_tcp(skb) ? tcp_hdrlen(skb) : sizeof(struct udphdr);

	int hdr_len = skb_transport_offset(skb) + tlen;



	tso->tlen = tlen;

	tso->ip_id = ntohs(ip_hdr(skb)->id);

	tso->tcp_seq = ntohl(tcp_hdr(skb)->seq);

	tso->tcp_seq = (tlen != sizeof(struct udphdr)) ? ntohl(tcp_hdr(skb)->seq) : 0;

	tso->next_frag_idx = 0;

	tso->ipv6 = vlan_get_protocol(skb) == htons(ETH_P_IPV6);