1 #ifndef _VIRTIO_NET_H_ 2 # define _VIRTIO_NET_H_ 3 4 /* The feature bitmap for virtio net */ 5 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ 6 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ 7 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 8 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 9 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 10 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 11 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 12 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 13 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 14 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 15 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 16 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 17 18 struct virtio_net_config 19 { 20 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 21 u8 mac[6]; 22 } __attribute__((packed)); 23 24 /* This is the first element of the scatter-gather list. If you don't 25 * specify GSO or CSUM features, you can simply ignore the header. */ 26 27 struct virtio_net_hdr 28 { 29 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 30 uint8_t flags; 31 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 32 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 33 /* FIXME: Do we need this? If they said they can handle ECN, do they care? */ 34 #define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN 35 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 36 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 37 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 38 uint8_t gso_type; 39 uint16_t hdr_len; 40 uint16_t gso_size; 41 uint16_t csum_start; 42 uint16_t csum_offset; 43 }; 44 #endif /* _VIRTIO_NET_H_ */ 45