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