1/*	$NetBSD: in_offload.h,v 1.12 2018/12/12 01:40:20 rin Exp $	*/
 2
 3/*
 4 * Copyright (c)2005, 2006 YAMAMOTO Takashi,
 5 * All rights reserved.
 6 *
 7 * Redistribution and use in source and binary forms, with or without
 8 * modification, are permitted provided that the following conditions
 9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _NETINET_IN_OFFLOAD_H_
30#define	_NETINET_IN_OFFLOAD_H_
31
32/*
33 * Subroutines to do software-only equivalent of h/w offloading.
34 */
35struct mbuf *tcp4_segment(struct mbuf *, int);
36int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
37    struct rtentry *);
38void in_undefer_cksum(struct mbuf *, size_t, int);
39void in_undefer_cksum_tcpudp(struct mbuf *);
40
41/*
42 * Offloading-related sysctl variables.
43 *
44 * They are here because it violates protocol layering in unusual way.
45 * ie. while they are TCP/UDP sysctls, they are used by IP layer.
46 */
47extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */
48extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */
49
50#define	IN_LOOPBACK_NEED_CHECKSUM(csum_flags) \
51	((((csum_flags) & M_CSUM_UDPv4) != 0 && udp_do_loopback_cksum) || \
52	(((csum_flags) & M_CSUM_TCPv4) != 0 && tcp_do_loopback_cksum) || \
53	(((csum_flags) & M_CSUM_IPv4) != 0 && ip_do_loopback_cksum))
54
55#define	IN_NEED_CHECKSUM(ifp, csum_flags) \
56	(__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \
57	IN_LOOPBACK_NEED_CHECKSUM(csum_flags)))
58
59#endif /* !_NETINET_IN_OFFLOAD_H_ */