a586d4f601
Previously we used a type/len pair within the config space, but this seems overkill. We now simply define a structure which represents the layout in the config space: the config space can now only be extended at the end. The main driver-visible changes: 1) We indicate what fields are present with an explicit feature bit. 2) Virtqueues are explicitly numbered, and not in the config space. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
40 lines
1.2 KiB
C
40 lines
1.2 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 gso_size;
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__u16 csum_start;
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__u16 csum_offset;
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};
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#endif /* _LINUX_VIRTIO_NET_H */
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