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 10 struct 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 */ tso_count_descs(const struct sk_buff * skb)21 static 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 26 void tso_build_hdr(const struct sk_buff *skb, char *hdr, struct tso_t *tso, 27 int size, bool is_last); 28 void tso_build_data(const struct sk_buff *skb, struct tso_t *tso, int size); 29 int tso_start(struct sk_buff *skb, struct tso_t *tso); 30 31 #endif /* _TSO_H */ 32