1 #ifndef _LINUX_VIRTIO_NET_H 2 #define _LINUX_VIRTIO_NET_H 3 /* This header is BSD licensed so anyone can use the definitions to implement 4 * compatible drivers/servers. */ 5 #include <linux/virtio_config.h> 6 7 /* The ID for virtio_net */ 8 #define VIRTIO_ID_NET 1 9 10 /* The feature bitmap for virtio net */ 11 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ 12 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ 13 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 14 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 15 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 16 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 17 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 18 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 19 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 20 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 21 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 22 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 23 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ 24 25 struct virtio_net_config 26 { 27 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 28 __u8 mac[6]; 29 } __attribute__((packed)); 30 31 /* This is the first element of the scatter-gather list. If you don't 32 * specify GSO or CSUM features, you can simply ignore the header. */ 33 struct virtio_net_hdr 34 { 35 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 36 __u8 flags; 37 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 38 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 39 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 40 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 41 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 42 __u8 gso_type; 43 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 44 __u16 gso_size; /* Bytes to append to hdr_len per frame */ 45 __u16 csum_start; /* Position to start checksumming from */ 46 __u16 csum_offset; /* Offset after that to place checksum */ 47 }; 48 49 /* This is the version of the header to use when the MRG_RXBUF 50 * feature has been negotiated. */ 51 struct virtio_net_hdr_mrg_rxbuf { 52 struct virtio_net_hdr hdr; 53 __u16 num_buffers; /* Number of merged rx buffers */ 54 }; 55 56 #endif /* _LINUX_VIRTIO_NET_H */ 57