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 /* Can handle pkts w/ partial csum */
10 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
11 #define VIRTIO_NET_F_GSO 6 /* Can handle pkts w/ any GSO type */
13 struct virtio_net_config
15 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
17 } __attribute__((packed));
19 /* This is the first element of the scatter-gather list. If you don't
20 * specify GSO or CSUM features, you can simply ignore the header. */
23 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
25 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
26 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
27 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
28 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
29 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
31 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
32 __u16 gso_size; /* Bytes to append to gso_hdr_len per frame */
33 __u16 csum_start; /* Position to start checksumming from */
34 __u16 csum_offset; /* Offset after that to place checksum */
36 #endif /* _LINUX_VIRTIO_NET_H */