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46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/**********************************************************************
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* Copyright (c) 2008 Red Hat, Inc.
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*
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* File: IONetDescriptor.h
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*
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* This file contains common guest/host definition, related
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* to VirtIO network adapter
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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**********************************************************************/
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#ifndef IONETDESCRIPTOR_H
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#define IONETDESCRIPTOR_H
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#pragma pack (push)
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#pragma pack (1)
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/* This is the first element of the scatter-gather list. If you don't
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* specify GSO or CSUM features, you can simply ignore the header. */
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typedef struct _tagvirtio_net_hdr
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{
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#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
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u8 flags;
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#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
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#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
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#define VIRTIO_NET_HDR_F_DATA_VALID 2 // Host checked checksum, no need to recheck
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#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
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#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
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#define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
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u8 gso_type;
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u16 hdr_len; // Ethernet + IP + tcp/udp hdrs
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u16 gso_size; // Bytes to append to gso_hdr_len per frame
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u16 csum_start; // Position to start checksumming from
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u16 csum_offset; // Offset after that to place checksum
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}virtio_net_hdr_basic;
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typedef struct _tagvirtio_net_hdr_ext
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{
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virtio_net_hdr_basic BasicHeader;
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u16 nBuffers;
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}virtio_net_hdr_ext;
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#pragma pack (pop)
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#endif
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