#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 */