src/drivers/net/virtio-net.h

   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_ */