1 /* $NetBSD: in6_offload.h,v 1.7 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 /* 30 * subroutines to do software-only equivalent of h/w offloading. 31 */ 32 33 #if !defined(_NETINET6_IN6_OFFLOAD_H_) 34 #define _NETINET6_IN6_OFFLOAD_H_ 35 36 int tcp6_segment(struct mbuf *, int (*)(void *, struct mbuf *), void *); 37 int ip6_tso_output(struct ifnet *, struct ifnet *, struct mbuf *, 38 const struct sockaddr_in6 *, struct rtentry *); 39 void ip6_undefer_csum(struct mbuf *, size_t, int); 40 41 extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */ 42 extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */ 43 44 #define IN6_LOOPBACK_NEED_CHECKSUM(csum_flags) \ 45 ((((csum_flags) & M_CSUM_UDPv6) != 0 && udp_do_loopback_cksum) || \ 46 (((csum_flags) & M_CSUM_TCPv6) != 0 && tcp_do_loopback_cksum)) 47 48 #define IN6_NEED_CHECKSUM(ifp, csum_flags) \ 49 (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \ 50 IN6_LOOPBACK_NEED_CHECKSUM(csum_flags))) 51 52 #endif /* !defined(_NETINET6_IN6_OFFLOAD_H_) */ 53