| #ifndef _LINUX_VIRTIO_NET_H |
| #define _LINUX_VIRTIO_NET_H |
| #include <linux/virtio_config.h> |
| |
| /* The ID for virtio_net */ |
| #define VIRTIO_ID_NET 1 |
| |
| /* The feature bitmap for virtio net */ |
| #define VIRTIO_NET_F_CSUM 0 /* Can handle pkts w/ partial csum */ |
| #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ |
| #define VIRTIO_NET_F_GSO 6 /* Can handle pkts w/ any GSO type */ |
| |
| struct virtio_net_config |
| { |
| /* The config defining mac address (if VIRTIO_NET_F_MAC) */ |
| __u8 mac[6]; |
| } __attribute__((packed)); |
| |
| /* This is the first element of the scatter-gather list. If you don't |
| * specify GSO or CSUM features, you can simply ignore the header. */ |
| struct virtio_net_hdr |
| { |
| #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset |
| __u8 flags; |
| #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame |
| #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) |
| #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) |
| #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP |
| #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set |
| __u8 gso_type; |
| __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ |
| __u16 gso_size; /* Bytes to append to gso_hdr_len per frame */ |
| __u16 csum_start; /* Position to start checksumming from */ |
| __u16 csum_offset; /* Offset after that to place checksum */ |
| }; |
| #endif /* _LINUX_VIRTIO_NET_H */ |