1 #ifndef _LINUX_VIRTIO_NET_H
2 #define _LINUX_VIRTIO_NET_H
3 /* This header is BSD licensed so anyone can use the definitions to implement
4 * compatible drivers/servers. */
5 #include <linux/types.h>
6 #include <linux/virtio_config.h>
7 #include <linux/if_ether.h>
9 /* The ID for virtio_net */
10 #define VIRTIO_ID_NET 1
12 /* The feature bitmap for virtio net */
13 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
14 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
15 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
16 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
17 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
18 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
19 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
20 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
21 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
22 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
23 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
24 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
25 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
26 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
27 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
28 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
29 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
31 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
33 struct virtio_net_config
35 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
37 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
39 } __attribute__((packed));
41 /* This is the first element of the scatter-gather list. If you don't
42 * specify GSO or CSUM features, you can simply ignore the header. */
45 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
47 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
48 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
49 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
50 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
51 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
53 __u16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
54 __u16 gso_size; /* Bytes to append to hdr_len per frame */
55 __u16 csum_start; /* Position to start checksumming from */
56 __u16 csum_offset; /* Offset after that to place checksum */
59 /* This is the version of the header to use when the MRG_RXBUF
60 * feature has been negotiated. */
61 struct virtio_net_hdr_mrg_rxbuf {
62 struct virtio_net_hdr hdr;
63 __u16 num_buffers; /* Number of merged rx buffers */
67 * Control virtqueue data structures
69 * The control virtqueue expects a header in the first sg entry
70 * and an ack/status response in the last entry. Data for the
71 * command goes in between.
73 struct virtio_net_ctrl_hdr {
76 } __attribute__((packed));
78 typedef __u8 virtio_net_ctrl_ack;
80 #define VIRTIO_NET_OK 0
81 #define VIRTIO_NET_ERR 1
84 * Control the RX mode, ie. promisucous and allmulti. PROMISC and
85 * ALLMULTI commands require an "out" sg entry containing a 1 byte
86 * state value, zero = disable, non-zero = enable. These commands
87 * are supported with the VIRTIO_NET_F_CTRL_RX feature.
89 #define VIRTIO_NET_CTRL_RX 0
90 #define VIRTIO_NET_CTRL_RX_PROMISC 0
91 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1
94 * Control the MAC filter table.
96 * The MAC filter table is managed by the hypervisor, the guest should
97 * assume the size is infinite. Filtering should be considered
98 * non-perfect, ie. based on hypervisor resources, the guest may
99 * received packets from sources not specified in the filter list.
101 * In addition to the class/cmd header, the TABLE_SET command requires
102 * two out scatterlists. Each contains a 4 byte count of entries followed
103 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The
104 * first sg list contains unicast addresses, the second is for multicast.
105 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
108 struct virtio_net_ctrl_mac {
110 __u8 macs[][ETH_ALEN];
111 } __attribute__((packed));
113 #define VIRTIO_NET_CTRL_MAC 1
114 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
117 * Control VLAN filtering
119 * The VLAN filter table is controlled via a simple ADD/DEL interface.
120 * VLAN IDs not added may be filterd by the hypervisor. Del is the
121 * opposite of add. Both commands expect an out entry containing a 2
122 * byte VLAN ID. VLAN filterting is available with the
123 * VIRTIO_NET_F_CTRL_VLAN feature bit.
125 #define VIRTIO_NET_CTRL_VLAN 2
126 #define VIRTIO_NET_CTRL_VLAN_ADD 0
127 #define VIRTIO_NET_CTRL_VLAN_DEL 1
129 #endif /* _LINUX_VIRTIO_NET_H */