1 #ifndef _LINUX_VIRTIO_NET_H
2 #define _LINUX_VIRTIO_NET_H
3 #include <linux/virtio_config.h>
5 /* The ID for virtio_net */
6 #define VIRTIO_ID_NET 1
8 /* The feature bitmap for virtio net */
9 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
10 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
11 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
12 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
13 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
14 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
15 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
16 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
17 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
18 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
19 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
20 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
22 struct virtio_net_config
24 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
26 } __attribute__((packed));
28 /* This is the first element of the scatter-gather list. If you don't
29 * specify GSO or CSUM features, you can simply ignore the header. */
32 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
34 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
35 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
36 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
37 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
38 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
40 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
41 __u16 gso_size; /* Bytes to append to gso_hdr_len per frame */
42 __u16 csum_start; /* Position to start checksumming from */
43 __u16 csum_offset; /* Offset after that to place checksum */
45 #endif /* _LINUX_VIRTIO_NET_H */