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      1 /*	$NetBSD: ether_sw_offload.h,v 1.1 2018/12/12 01:40:20 rin Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Rin Okuyama.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _NET_ETHER_SW_OFFLOAD_H_
     33 #define _NET_ETHER_SW_OFFLOAD_H_
     34 
     35 #ifdef _KERNEL
     36 #include <sys/mbuf.h>
     37 #include <net/if.h>
     38 
     39 /*
     40  * Whether given TX offload options are supported by the interface.
     41  * We need to check TSO bits first; M_CSUM_IPv4 is turned on even if
     42  * TSOv4 is enabled (and some drivers depend on this behavior).
     43  * Therefore we cannot test
     44  *	m->m_pkthdr.csum_flags & ~ifp->if_csum_flags_tx
     45  * for interfaces that do not support hw IPv4 checksum.
     46  */
     47 #define TX_OFFLOAD_SUPPORTED(if_flags, mbuf_flags)			\
     48     ((((mbuf_flags) & (M_CSUM_TSOv4 | M_CSUM_TSOv6)) & (if_flags)) ||	\
     49      !((mbuf_flags) & ~(if_flags)))
     50 
     51 struct mbuf *ether_sw_offload_tx(struct ifnet *, struct mbuf *);
     52 struct mbuf *ether_sw_offload_rx(struct ifnet *, struct mbuf *);
     53 #endif /* _KERNEL */
     54 
     55 #endif /* !_NET_ETHER_SW_OFFLOAD_H_ */
     56