The Design and Implementation of the FreeBSD Operating System, Second Edition
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 1.6 2007/11/28 04:14:11 dyoung 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 
   36 int tcp4_segment(struct mbuf *, int (*)(void *, struct mbuf *), void *);
   37 int ip_tso_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
   38     struct rtentry *);
   39 
   40 /*
   41  * offloading related sysctl variables.
   42  *
   43  * they are here because it violates protocol layering in unusual way.
   44  * ie. while they are TCP/UDP sysctls, they are used by IP layer.
   45  */
   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_NEED_CHECKSUM(ifp, csum_flags) \
   51         (__predict_true(((ifp)->if_flags & IFF_LOOPBACK) == 0 || \
   52         (((csum_flags) & M_CSUM_UDPv4) != 0 && udp_do_loopback_cksum) || \
   53         (((csum_flags) & M_CSUM_TCPv4) != 0 && tcp_do_loopback_cksum) || \
   54         (((csum_flags) & M_CSUM_IPv4) != 0 && ip_do_loopback_cksum)))
   55 
   56 #endif /* !_NETINET_IN_OFFLOAD_H_ */

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