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