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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_ */
     60