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/types.h> 6 #include <linux/virtio_config.h> 7 8 /* The ID for virtio_net */ 9 #define VIRTIO_ID_NET 1 10 11 /* The feature bitmap for virtio net */ 12 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ 13 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ 14 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 15 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 16 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 17 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 18 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 19 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 20 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 21 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 22 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 23 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 24 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ 25 26 struct virtio_net_config 27 { 28 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 29 __u8 mac[6]; 30 } __attribute__((packed)); 31 32 /* This is the first element of the scatter-gather list. If you don't 33 * specify GSO or CSUM features, you can simply ignore the header. */ 34 struct virtio_net_hdr 35 { 36 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 37 __u8 flags; 38 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 39 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 40 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 41 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 42 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 43 __u8 gso_type; 44 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 45 __u16 gso_size; /* Bytes to append to hdr_len per frame */ 46 __u16 csum_start; /* Position to start checksumming from */ 47 __u16 csum_offset; /* Offset after that to place checksum */ 48 }; 49 50 /* This is the version of the header to use when the MRG_RXBUF 51 * feature has been negotiated. */ 52 struct virtio_net_hdr_mrg_rxbuf { 53 struct virtio_net_hdr hdr; 54 __u16 num_buffers; /* Number of merged rx buffers */ 55 }; 56 57 #endif /* _LINUX_VIRTIO_NET_H */ 58