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- #ifndef _VIRTIO_NET_H_
- # define _VIRTIO_NET_H_
-
- /* The feature bitmap for virtio net */
- #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
- #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
- #define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */
- #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
- #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
- #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
- #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
- #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
- #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
- #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
- #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
- #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
- #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
- #define VIRTIO_NET_F_MRG_RXBUF 15 /* Driver can merge receive buffers. */
- #define VIRTIO_NET_F_STATUS 16 /* Configuration status field is available. */
- #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel is available. */
- #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support. */
- #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering. */
- #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Driver can send gratuitous packets. */
-
- struct virtio_net_config
- {
- /* The config defining mac address (if VIRTIO_NET_F_MAC) */
- u8 mac[6];
- /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
- u16 status;
- /* Maximum number of each of transmit and receive queues;
- * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
- * Legal values are between 1 and 0x8000
- */
- u16 max_virtqueue_pairs;
- /* Default maximum transmit unit advice */
- u16 mtu;
- } __attribute__((packed));
-
- /* This is the first element of the scatter-gather list. If you don't
- * specify GSO or CSUM features, you can simply ignore the header. */
-
- struct virtio_net_hdr
- {
- #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
- uint8_t flags;
- #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
- #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
- /* FIXME: Do we need this? If they said they can handle ECN, do they care? */
- #define VIRTIO_NET_HDR_GSO_TCPV4_ECN 2 // GSO frame, IPv4 TCP w/ ECN
- #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
- #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
- #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
- uint8_t gso_type;
- uint16_t hdr_len;
- uint16_t gso_size;
- uint16_t csum_start;
- uint16_t csum_offset;
- };
-
- /* Virtio 1.0 version of the first element of the scatter-gather list. */
- struct virtio_net_hdr_modern
- {
- struct virtio_net_hdr legacy;
-
- /* Used only if VIRTIO_NET_F_MRG_RXBUF: */
- uint16_t num_buffers;
- };
-
- #endif /* _VIRTIO_NET_H_ */
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