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_MTU 3 /* Initial MTU advice */ 8 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 9 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 10 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 11 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 12 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 13 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 14 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 15 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 16 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 17 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 18 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Driver can merge receive buffers. */ 19 #define VIRTIO_NET_F_STATUS 16 /* Configuration status field is available. */ 20 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel is available. */ 21 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support. */ 22 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering. */ 23 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Driver can send gratuitous packets. */ 24 25 struct virtio_net_config 26 { 27 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 28 u8 mac[6]; 29 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 30 u16 status; 31 /* Maximum number of each of transmit and receive queues; 32 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. 33 * Legal values are between 1 and 0x8000 34 */ 35 u16 max_virtqueue_pairs; 36 /* Default maximum transmit unit advice */ 37 u16 mtu; 38 } __attribute__((packed)); 39 40 /* This is the first element of the scatter-gather list. If you don't 41 * specify GSO or CSUM features, you can simply ignore the header. */ 42 43 struct virtio_net_hdr 44 { 45 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset 46 uint8_t flags; 47 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame 48 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO) 49 /* FIXME: Do we need this? If they said they can handle ECN, do they care? */ 50 #define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN 51 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO) 52 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP 53 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set 54 uint8_t gso_type; 55 uint16_t hdr_len; 56 uint16_t gso_size; 57 uint16_t csum_start; 58 uint16_t csum_offset; 59 }; 60 61 /* Virtio 1.0 version of the first element of the scatter-gather list. */ 62 struct virtio_net_hdr_modern 63 { 64 struct virtio_net_hdr legacy; 65 66 /* Used only if VIRTIO_NET_F_MRG_RXBUF: */ 67 uint16_t num_buffers; 68 }; 69 70 #endif /* _VIRTIO_NET_H_ */ 71