sys/netinet/in_offload.h

   1 /*      $NetBSD: in_offload.h,v 1.5 2007/04/24 23:43:50 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_ */