2 * This header is BSD licensed so anyone can use the definitions to implement
3 * compatible drivers/servers.
11 #include <sys/types.h>
13 /* The feature bitmap for virtio net */
14 #define VIRTIO_NET_F_CSUM 0x00001 /* Host handles pkts w/ partial csum */
15 #define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/
16 #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 0x00004 /* Guest can do dynamic
17 * offloads state configuration */
18 #define VIRTIO_NET_F_MAC 0x00020 /* Host has given MAC address. */
19 #define VIRTIO_NET_F_GSO 0x00040 /* Host handles pkts w/ any GSO type */
20 #define VIRTIO_NET_F_GUEST_TSO4 0x00080 /* Guest can handle TSOv4 in. */
21 #define VIRTIO_NET_F_GUEST_TSO6 0x00100 /* Guest can handle TSOv6 in. */
22 #define VIRTIO_NET_F_GUEST_ECN 0x00200 /* Guest can handle TSO[6] w/ ECN in.*/
23 #define VIRTIO_NET_F_GUEST_UFO 0x00400 /* Guest can handle UFO in. */
24 #define VIRTIO_NET_F_HOST_TSO4 0x00800 /* Host can handle TSOv4 in. */
25 #define VIRTIO_NET_F_HOST_TSO6 0x01000 /* Host can handle TSOv6 in. */
26 #define VIRTIO_NET_F_HOST_ECN 0x02000 /* Host can handle TSO[6] w/ ECN in. */
27 #define VIRTIO_NET_F_HOST_UFO 0x04000 /* Host can handle UFO in. */
28 #define VIRTIO_NET_F_MRG_RXBUF 0x08000 /* Host can merge receive buffers. */
29 #define VIRTIO_NET_F_STATUS 0x10000 /* virtio_net_config.status available*/
30 #define VIRTIO_NET_F_CTRL_VQ 0x20000 /* Control channel available */
31 #define VIRTIO_NET_F_CTRL_RX 0x40000 /* Control channel RX mode support */
32 #define VIRTIO_NET_F_CTRL_VLAN 0x80000 /* Control channel VLAN filtering */
33 #define VIRTIO_NET_F_CTRL_RX_EXTRA 0x100000 /* Extra RX mode control support */
34 #define VIRTIO_NET_F_GUEST_ANNOUNCE 0x200000 /* Guest can announce device on the
36 #define VIRTIO_NET_F_MQ 0x400000 /* Device supports Receive Flow
38 #define VIRTIO_NET_F_CTRL_MAC_ADDR 0x800000 /* Set MAC address */
40 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
41 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
43 struct virtio_net_config {
44 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
45 uint8_t mac[ETHER_ADDR_LEN];
46 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
48 /* Maximum number of each of transmit and receive queues;
49 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
50 * Legal values are between 1 and 0x8000
52 uint16_t max_virtqueue_pairs;
56 * This is the first element of the scatter-gather list. If you don't
57 * specify GSO or CSUM features, you can simply ignore the header.
59 struct virtio_net_hdr {
60 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start,csum_offset*/
62 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
63 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
64 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
65 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
66 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
68 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
69 uint16_t gso_size; /* Bytes to append to hdr_len per frame */
70 uint16_t csum_start; /* Position to start checksumming from */
71 uint16_t csum_offset; /* Offset after that to place checksum */
75 * This is the version of the header to use when the MRG_RXBUF
76 * feature has been negotiated.
78 struct virtio_net_hdr_mrg_rxbuf {
79 struct virtio_net_hdr hdr;
80 uint16_t num_buffers; /* Number of merged rx buffers */
84 * Control virtqueue data structures
86 * The control virtqueue expects a header in the first sg entry
87 * and an ack/status response in the last entry. Data for the
88 * command goes in between.
90 struct virtio_net_ctrl_hdr {
95 typedef uint8_t virtio_net_ctrl_ack;
97 #define VIRTIO_NET_OK 0
98 #define VIRTIO_NET_ERR 1
101 * Control the RX mode, ie. promiscuous, allmulti, etc...
102 * All commands require an "out" sg entry containing a 1 byte
103 * state value, zero = disable, non-zero = enable. Commands
104 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
105 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
107 #define VIRTIO_NET_CTRL_RX 0
108 #define VIRTIO_NET_CTRL_RX_PROMISC 0
109 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1
110 #define VIRTIO_NET_CTRL_RX_ALLUNI 2
111 #define VIRTIO_NET_CTRL_RX_NOMULTI 3
112 #define VIRTIO_NET_CTRL_RX_NOUNI 4
113 #define VIRTIO_NET_CTRL_RX_NOBCAST 5
116 * Control the MAC filter table.
118 * The MAC filter table is managed by the hypervisor, the guest should
119 * assume the size is infinite. Filtering should be considered
120 * non-perfect, ie. based on hypervisor resources, the guest may
121 * received packets from sources not specified in the filter list.
123 * In addition to the class/cmd header, the TABLE_SET command requires
124 * two out scatterlists. Each contains a 4 byte count of entries followed
125 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The
126 * first sg list contains unicast addresses, the second is for multicast.
127 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
130 struct virtio_net_ctrl_mac {
132 uint8_t macs[][ETHER_ADDR_LEN];
135 #define VIRTIO_NET_CTRL_MAC 1
136 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
137 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
140 * Control VLAN filtering
142 * The VLAN filter table is controlled via a simple ADD/DEL interface.
143 * VLAN IDs not added may be filtered by the hypervisor. Del is the
144 * opposite of add. Both commands expect an out entry containing a 2
145 * byte VLAN ID. VLAN filtering is available with the
146 * VIRTIO_NET_F_CTRL_VLAN feature bit.
148 #define VIRTIO_NET_CTRL_VLAN 2
149 #define VIRTIO_NET_CTRL_VLAN_ADD 0
150 #define VIRTIO_NET_CTRL_VLAN_DEL 1
153 * Control link announce acknowledgement
155 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
156 * driver has recevied the notification; device would clear the
157 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
160 #define VIRTIO_NET_CTRL_ANNOUNCE 3
161 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
164 * Control Receive Flow Steering
166 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
167 * enables Receive Flow Steering, specifying the number of the transmit and
168 * receive queues that will be used. After the command is consumed and acked by
169 * the device, the device will not steer new packets on receive virtqueues
170 * other than specified nor read from transmit virtqueues other than specified.
171 * Accordingly, driver should not transmit new packets on virtqueues other than
174 struct virtio_net_ctrl_mq {
175 uint16_t virtqueue_pairs;
178 #define VIRTIO_NET_CTRL_MQ 4
179 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
180 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
181 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
183 #endif /* _VIRTIO_NET_H */