50c8ea8080
It's far easier to deal with packets if we don't have to parse the packet to figure out the header length to know how much to pull into the skb data. Add the field to the virtio_net_hdr struct (and fix the spaces that somehow crept in there). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
#ifndef _LINUX_VIRTIO_NET_H
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#define _LINUX_VIRTIO_NET_H
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#include <linux/virtio_config.h>
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/* The ID for virtio_net */
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#define VIRTIO_ID_NET 1
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/* The feature bitmap for virtio net */
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#define VIRTIO_NET_F_NO_CSUM 0
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#define VIRTIO_NET_F_TSO4 1
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#define VIRTIO_NET_F_UFO 2
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#define VIRTIO_NET_F_TSO4_ECN 3
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#define VIRTIO_NET_F_TSO6 4
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#define VIRTIO_NET_F_MAC 5
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struct virtio_net_config
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{
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/* The config defining mac address (if VIRTIO_NET_F_MAC) */
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__u8 mac[6];
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} __attribute__((packed));
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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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struct virtio_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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/* FIXME: Do we need this? If they said they can handle ECN, do they care? */
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#define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN
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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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__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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};
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#endif /* _LINUX_VIRTIO_NET_H */
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