Linux kernel mirror (for testing)
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linux
1#ifndef _LINUX_VIRTIO_NET_H
2#define _LINUX_VIRTIO_NET_H
3/* This header is BSD licensed so anyone can use the definitions to implement
4 * compatible drivers/servers. */
5#include <linux/types.h>
6#include <linux/virtio_config.h>
7
8/* The ID for virtio_net */
9#define VIRTIO_ID_NET 1
10
11/* The feature bitmap for virtio net */
12#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
13#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
14#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
15#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
16#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
17#define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
18#define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
19#define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
20#define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
21#define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
22#define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
23#define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
24#define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
25
26struct virtio_net_config
27{
28 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
29 __u8 mac[6];
30} __attribute__((packed));
31
32/* This is the first element of the scatter-gather list. If you don't
33 * specify GSO or CSUM features, you can simply ignore the header. */
34struct virtio_net_hdr
35{
36#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
37 __u8 flags;
38#define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
39#define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
40#define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
41#define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
42#define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
43 __u8 gso_type;
44 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
45 __u16 gso_size; /* Bytes to append to hdr_len per frame */
46 __u16 csum_start; /* Position to start checksumming from */
47 __u16 csum_offset; /* Offset after that to place checksum */
48};
49
50/* This is the version of the header to use when the MRG_RXBUF
51 * feature has been negotiated. */
52struct virtio_net_hdr_mrg_rxbuf {
53 struct virtio_net_hdr hdr;
54 __u16 num_buffers; /* Number of merged rx buffers */
55};
56
57#endif /* _LINUX_VIRTIO_NET_H */