static struct sk_buff *tcp_sacktag_skip(struct sk_buff *skb, struct sock *sk,
					struct tcp_sacktag_state *state,
					u32 skip_to_seq)
{
	tcp_for_write_queue_from(skb, sk) {
		if (skb == tcp_send_head(sk))
			break;

		if (after(TCP_SKB_CB(skb)->end_seq, skip_to_seq))
			break;

		state->fack_count += tcp_skb_pcount(skb);
	}
	return skb;
}
Unknown