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      1 #ifndef _LINUX_VIRTIO_NET_H
      2 #define _LINUX_VIRTIO_NET_H
      3 #include <linux/virtio_config.h>
      4 
      5 /* The ID for virtio_net */
      6 #define VIRTIO_ID_NET	1
      7 
      8 /* The feature bitmap for virtio net */
      9 #define VIRTIO_NET_F_CSUM	0	/* Can handle pkts w/ partial csum */
     10 #define VIRTIO_NET_F_MAC	5	/* Host has given MAC address. */
     11 #define VIRTIO_NET_F_GSO	6	/* Can handle pkts w/ any GSO type */
     12 
     13 struct virtio_net_config
     14 {
     15 	/* The config defining mac address (if VIRTIO_NET_F_MAC) */
     16 	__u8 mac[6];
     17 } __attribute__((packed));
     18 
     19 /* This is the first element of the scatter-gather list.  If you don't
     20  * specify GSO or CSUM features, you can simply ignore the header. */
     21 struct virtio_net_hdr
     22 {
     23 #define VIRTIO_NET_HDR_F_NEEDS_CSUM	1	// Use csum_start, csum_offset
     24 	__u8 flags;
     25 #define VIRTIO_NET_HDR_GSO_NONE		0	// Not a GSO frame
     26 #define VIRTIO_NET_HDR_GSO_TCPV4	1	// GSO frame, IPv4 TCP (TSO)
     27 #define VIRTIO_NET_HDR_GSO_UDP		3	// GSO frame, IPv4 UDP (UFO)
     28 #define VIRTIO_NET_HDR_GSO_TCPV6	4	// GSO frame, IPv6 TCP
     29 #define VIRTIO_NET_HDR_GSO_ECN		0x80	// TCP has ECN set
     30 	__u8 gso_type;
     31 	__u16 hdr_len;		/* Ethernet + IP + tcp/udp hdrs */
     32 	__u16 gso_size;		/* Bytes to append to gso_hdr_len per frame */
     33 	__u16 csum_start;	/* Position to start checksumming from */
     34 	__u16 csum_offset;	/* Offset after that to place checksum */
     35 };
     36 #endif /* _LINUX_VIRTIO_NET_H */
     37