include/net/tso.h

   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 */
  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 */