Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_offload.h
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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 */ 35 struct mbuf *tcp4_segment(struct mbuf *, int); 36 int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *, 37 struct rtentry *); 38 void in_undefer_cksum(struct mbuf *, size_t, int); 39 void 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 */ 47 extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */ 48 extern 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_ */
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