1 #ifndef _LINUX_VIRTIO_NET_H 2 #define _LINUX_VIRTIO_NET_H 3 #include <linux/virtio_config.h> 4 5 /* The ID for virtio_net */ 6 #define VIRTIO_ID_NET 1 7 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. */ 21 22 struct virtio_net_config 23 { 24 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 25 __u8 mac[6]; 26 } __attribute__((packed)); 27 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. */ 30 struct virtio_net_hdr 31 { 32 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 33 __u8 flags; 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 39 __u8 gso_type; 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 */ 44 }; 45 #endif /* _LINUX_VIRTIO_NET_H */ 46
