| 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 | |