1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _TSO_H
3#define _TSO_H
4
5#include <linux/skbuff.h>
6#include <net/ip.h>
7
8#define TSO_HEADER_SIZE		256
9
10struct tso_t {
11	int	next_frag_idx;
12	int	size;
13	void	*data;
14	u16	ip_id;
15	u8	tlen; /* transport header len */
16	bool	ipv6;
17	u32	tcp_seq;
18};
19
20/* Calculate the worst case buffer count */
21static inline int tso_count_descs(const struct sk_buff *skb)
22{
23	return skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
24}
25
26void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso,
27		   int size, bool is_last);
28void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size);
29int tso_start(struct sk_buff *skb, struct tso_t *tso);
30
31#endif	/* _TSO_H */
32