60 lines
2.5 KiB
C
60 lines
2.5 KiB
C
/* $NetBSD: in_offload.h,v 1.12 2018/12/12 01:40:20 rin Exp $ */
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/*
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* Copyright (c)2005, 2006 YAMAMOTO Takashi,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NETINET_IN_OFFLOAD_H_
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#define _NETINET_IN_OFFLOAD_H_
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/*
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* Subroutines to do software-only equivalent of h/w offloading.
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*/
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struct mbuf *tcp4_segment(struct mbuf *, int);
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int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
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struct rtentry *);
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void in_undefer_cksum(struct mbuf *, size_t, int);
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void in_undefer_cksum_tcpudp(struct mbuf *);
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/*
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* Offloading-related sysctl variables.
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*
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* They are here because it violates protocol layering in unusual way.
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* ie. while they are TCP/UDP sysctls, they are used by IP layer.
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*/
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extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */
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extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */
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#define IN_LOOPBACK_NEED_CHECKSUM(csum_flags) \
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((((csum_flags) & M_CSUM_UDPv4) != 0 && udp_do_loopback_cksum) || \
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(((csum_flags) & M_CSUM_TCPv4) != 0 && tcp_do_loopback_cksum) || \
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(((csum_flags) & M_CSUM_IPv4) != 0 && ip_do_loopback_cksum))
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#define IN_NEED_CHECKSUM(ifp, csum_flags) \
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(__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \
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IN_LOOPBACK_NEED_CHECKSUM(csum_flags)))
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#endif /* !_NETINET_IN_OFFLOAD_H_ */
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