2 * Virtio Network Device
4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_NET_H
15 #define _QEMU_VIRTIO_NET_H
23 /* from Linux's virtio_net.h */
25 /* The ID for virtio_net */
26 #define VIRTIO_ID_NET 1
28 /* The feature bitmap for virtio net */
29 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
30 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
31 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
32 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
33 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
34 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
35 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
36 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
37 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
38 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
39 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
40 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
41 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
42 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
43 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
45 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
47 #define TX_TIMER_INTERVAL 150000 /* 150 us */
49 /* Maximum packet size we can receive from tap device: header + 64k */
50 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
52 struct virtio_net_config
54 /* The config defining mac address (6 bytes) */
56 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
58 } __attribute__((packed));
60 /* This is the first element of the scatter-gather list. If you don't
61 * specify GSO or CSUM features, you can simply ignore the header. */
64 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
66 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
67 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
68 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
69 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
70 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
78 /* This is the version of the header to use when the MRG_RXBUF
79 * feature has been negotiated. */
80 struct virtio_net_hdr_mrg_rxbuf
82 struct virtio_net_hdr hdr;
83 uint16_t num_buffers; /* Number of merged rx buffers */
86 void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn);
89 * Control virtqueue data structures
91 * The control virtqueue expects a header in the first sg entry
92 * and an ack/status response in the last entry. Data for the
93 * command goes in between.
95 struct virtio_net_ctrl_hdr {
100 typedef uint8_t virtio_net_ctrl_ack;
102 #define VIRTIO_NET_OK 0
103 #define VIRTIO_NET_ERR 1