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in_offload.h revision 1.8 
      1  1.8    yamt /*	$NetBSD: in_offload.h,v 1.8 2011/04/25 22:20:59 yamt Exp $	*/
      2  1.1    yamt 
      3  1.1    yamt /*-
      4  1.4    yamt  * Copyright (c)2005, 2006 YAMAMOTO Takashi,
      5  1.1    yamt  * All rights reserved.
      6  1.1    yamt  *
      7  1.1    yamt  * Redistribution and use in source and binary forms, with or without
      8  1.1    yamt  * modification, are permitted provided that the following conditions
      9  1.1    yamt  * are met:
     10  1.1    yamt  * 1. Redistributions of source code must retain the above copyright
     11  1.1    yamt  *    notice, this list of conditions and the following disclaimer.
     12  1.1    yamt  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1    yamt  *    notice, this list of conditions and the following disclaimer in the
     14  1.1    yamt  *    documentation and/or other materials provided with the distribution.
     15  1.1    yamt  *
     16  1.1    yamt  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  1.1    yamt  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  1.1    yamt  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  1.1    yamt  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  1.1    yamt  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  1.1    yamt  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  1.1    yamt  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  1.1    yamt  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  1.1    yamt  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  1.1    yamt  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  1.1    yamt  * SUCH DAMAGE.
     27  1.1    yamt  */
     28  1.1    yamt 
     29  1.3    elad #ifndef _NETINET_IN_OFFLOAD_H_
     30  1.2    yamt #define	_NETINET_IN_OFFLOAD_H_
     31  1.2    yamt 
     32  1.1    yamt /*
     33  1.1    yamt  * subroutines to do software-only equivalent of h/w offloading.
     34  1.1    yamt  */
     35  1.1    yamt 
     36  1.2    yamt int tcp4_segment(struct mbuf *, int (*)(void *, struct mbuf *), void *);
     37  1.5  dyoung int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
     38  1.4    yamt     struct rtentry *);
     39  1.7    matt void ip_undefer_csum(struct mbuf *, size_t, int);
     40  1.2    yamt 
     41  1.2    yamt /*
     42  1.2    yamt  * offloading related sysctl variables.
     43  1.2    yamt  *
     44  1.2    yamt  * they are here because it violates protocol layering in unusual way.
     45  1.2    yamt  * ie. while they are TCP/UDP sysctls, they are used by IP layer.
     46  1.2    yamt  */
     47  1.1    yamt 
     48  1.2    yamt extern int tcp_do_loopback_cksum; /* do TCP checksum on loopback? */
     49  1.2    yamt extern int udp_do_loopback_cksum; /* do UDP checksum on loopback? */
     50  1.1    yamt 
     51  1.8    yamt #define	IN_LOOPBACK_NEED_CHECKSUM(csum_flags) \
     52  1.8    yamt 	((((csum_flags) & M_CSUM_UDPv4) != 0 && udp_do_loopback_cksum) || \
     53  1.8    yamt 	(((csum_flags) & M_CSUM_TCPv4) != 0 && tcp_do_loopback_cksum) || \
     54  1.8    yamt 	(((csum_flags) & M_CSUM_IPv4) != 0 && ip_do_loopback_cksum))
     55  1.8    yamt 
     56  1.6  dyoung #define	IN_NEED_CHECKSUM(ifp, csum_flags) \
     57  1.6  dyoung 	(__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \
     58  1.8    yamt 	IN_LOOPBACK_NEED_CHECKSUM(csum_flags)))
     59  1.6  dyoung 
     60  1.3    elad #endif /* !_NETINET_IN_OFFLOAD_H_ */
     61