1 | /* $NetBSD: in_offload.h,v 1.8 2011/04/25 22:20:59 yamt 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 | */ |
35 | |
36 | int tcp4_segment(struct mbuf *, int (*)(void *, struct mbuf *), void *); |
37 | int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *, |
38 | struct rtentry *); |
39 | void ip_undefer_csum(struct mbuf *, size_t, int); |
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 | */ |
47 | |
48 | extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */ |
49 | extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */ |
50 | |
51 | #define IN_LOOPBACK_NEED_CHECKSUM(csum_flags) \ |
52 | ((((csum_flags) & M_CSUM_UDPv4) != 0 && udp_do_loopback_cksum) || \ |
53 | (((csum_flags) & M_CSUM_TCPv4) != 0 && tcp_do_loopback_cksum) || \ |
54 | (((csum_flags) & M_CSUM_IPv4) != 0 && ip_do_loopback_cksum)) |
55 | |
56 | #define IN_NEED_CHECKSUM(ifp, csum_flags) \ |
57 | (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \ |
58 | IN_LOOPBACK_NEED_CHECKSUM(csum_flags))) |
59 | |
60 | #endif /* !_NETINET_IN_OFFLOAD_H_ */ |
61 | |