1 /* SPDX-License-Identifier: BSD-3-Clause */
3 * Copyright (C) 2018, Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
4 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
6 * From Linux kernel include/uapi/linux/virtio_net.h
9 #ifndef _LINUX_VIRTIO_NET_H
10 #define _LINUX_VIRTIO_NET_H
12 /* TODO: needs to be removed! */
15 /* The feature bitmap for virtio net */
17 /* Host handles pkts w/ partial csum */
18 #define VIRTIO_NET_F_CSUM 0
19 /* Guest handles pkts w/ partial csum */
20 #define VIRTIO_NET_F_GUEST_CSUM 1
21 /* Dynamic offload configuration */
22 #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2
23 /* Initial MTU advice */
24 #define VIRTIO_NET_F_MTU 3
25 /* Host has given MAC address */
26 #define VIRTIO_NET_F_MAC 5
27 /* Guest can handle TSOv4 in */
28 #define VIRTIO_NET_F_GUEST_TSO4 7
29 /* Guest can handle TSOv6 in */
30 #define VIRTIO_NET_F_GUEST_TSO6 8
31 /* Guest can handle TSO[6] w/ ECN in */
32 #define VIRTIO_NET_F_GUEST_ECN 9
33 /* Guest can handle UFO in */
34 #define VIRTIO_NET_F_GUEST_UFO 10
35 /* Host can handle TSOv4 in */
36 #define VIRTIO_NET_F_HOST_TSO4 11
37 /* Host can handle TSOv6 in */
38 #define VIRTIO_NET_F_HOST_TSO6 12
39 /* Host can handle TSO[6] w/ ECN in */
40 #define VIRTIO_NET_F_HOST_ECN 13
41 /* Host can handle UFO in */
42 #define VIRTIO_NET_F_HOST_UFO 14
43 /* Host can merge receive buffers */
44 #define VIRTIO_NET_F_MRG_RXBUF 15
45 /* virtio_net_config.status available */
46 #define VIRTIO_NET_F_STATUS 16
47 /* Control channel available */
48 #define VIRTIO_NET_F_CTRL_VQ 17
49 /* Control channel RX mode support */
50 #define VIRTIO_NET_F_CTRL_RX 18
51 /* Control channel VLAN filtering */
52 #define VIRTIO_NET_F_CTRL_VLAN 19
53 /* Extra RX mode control support */
54 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20
55 /* Guest can announce device on the network */
56 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21
57 /* Device supports receive flow steering */
58 #define VIRTIO_NET_F_MQ 22
60 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23
61 /* Device set linkspeed and duplex */
62 #define VIRTIO_NET_F_SPEED_DUPLEX 63
64 #ifndef VIRTIO_NET_NO_LEGACY
65 /* Host handles pkts w/ any GSO type */
66 #define VIRTIO_NET_F_GSO 6
67 #endif /* VIRTIO_NET_NO_LEGACY */
69 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
70 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */
72 struct __packed virtio_net_config {
73 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
75 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
78 * Maximum number of each of transmit and receive queues;
79 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
80 * Legal values are between 1 and 0x8000
82 __u16 max_virtqueue_pairs;
83 /* Default maximum transmit unit advice */
86 * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
87 * Any other value stands for unknown.
93 * Any other value stands for unknown.
99 * This header comes first in the scatter-gather list. If you don't
100 * specify GSO or CSUM features, you can simply ignore the header.
102 * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
105 struct virtio_net_hdr_v1 {
106 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 0x01 /* Use csum_start, csum_offset */
107 #define VIRTIO_NET_HDR_F_DATA_VALID 0x02 /* Csum is valid */
109 #define VIRTIO_NET_HDR_GSO_NONE 0x00 /* Not a GSO frame */
110 #define VIRTIO_NET_HDR_GSO_TCPV4 0x01 /* GSO frame, IPv4 TCP (TSO) */
111 #define VIRTIO_NET_HDR_GSO_UDP 0x03 /* GSO frame, IPv4 UDP (UFO) */
112 #define VIRTIO_NET_HDR_GSO_TCPV6 0x04 /* GSO frame, IPv6 TCP */
113 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
115 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
116 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */
117 __virtio16 csum_start; /* Position to start checksumming from */
118 __virtio16 csum_offset; /* Offset after that to place checksum */
119 __virtio16 num_buffers; /* Number of merged rx buffers */
122 #ifndef VIRTIO_NET_NO_LEGACY
124 * This header comes first in the scatter-gather list.
126 * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
127 * be the first element of the scatter-gather list. If you don't
128 * specify GSO or CSUM features, you can simply ignore the header.
130 struct virtio_net_hdr {
131 /* See VIRTIO_NET_HDR_F_* */
133 /* See VIRTIO_NET_HDR_GSO_* */
135 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
136 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */
137 __virtio16 csum_start; /* Position to start checksumming from */
138 __virtio16 csum_offset; /* Offset after that to place checksum */
142 * This is the version of the header to use when the MRG_RXBUF
143 * feature has been negotiated.
145 struct virtio_net_hdr_mrg_rxbuf {
146 struct virtio_net_hdr hdr;
147 __virtio16 num_buffers; /* Number of merged rx buffers */
149 #endif /* ...VIRTIO_NET_NO_LEGACY */
152 * Control virtqueue data structures
154 * The control virtqueue expects a header in the first sg entry
155 * and an ack/status response in the last entry. Data for the
156 * command goes in between.
158 struct __packed virtio_net_ctrl_hdr {
163 typedef __u8 virtio_net_ctrl_ack;
165 #define VIRTIO_NET_OK 0
166 #define VIRTIO_NET_ERR 1
169 * Control the RX mode, ie. promisucous, allmulti, etc...
171 * All commands require an "out" sg entry containing a 1 byte state value,
172 * zero = disable, non-zero = enable.
174 * Commands 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
175 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
177 #define VIRTIO_NET_CTRL_RX 0
178 #define VIRTIO_NET_CTRL_RX_PROMISC 0
179 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1
180 #define VIRTIO_NET_CTRL_RX_ALLUNI 2
181 #define VIRTIO_NET_CTRL_RX_NOMULTI 3
182 #define VIRTIO_NET_CTRL_RX_NOUNI 4
183 #define VIRTIO_NET_CTRL_RX_NOBCAST 5
188 * The MAC filter table is managed by the hypervisor, the guest should assume
189 * the size is infinite. Filtering should be considered non-perfect, ie. based
190 * on hypervisor resources, the guest may received packets from sources not
191 * specified in the filter list.
193 * In addition to the class/cmd header, the TABLE_SET command requires two
194 * out scatterlists. Each contains a 4 byte count of entries followed by a
195 * concatenated byte stream of the ETH_ALEN MAC addresses. The first sg list
196 * contains unicast addresses, the second is for multicast. This functionality
197 * is present if the VIRTIO_NET_F_CTRL_RX feature is available.
199 * The ADDR_SET command requests one out scatterlist, it contains a 6 bytes MAC
200 * address. This functionality is present if the VIRTIO_NET_F_CTRL_MAC_ADDR
201 * feature is available.
203 struct __packed virtio_net_ctrl_mac {
205 __u8 macs[][ETH_ALEN];
208 #define VIRTIO_NET_CTRL_MAC 1
209 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
210 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
213 * Control VLAN filtering
215 * The VLAN filter table is controlled via a simple ADD/DEL interface. VLAN IDs
216 * not added may be filterd by the hypervisor. Del is the opposite of add. Both
217 * commands expect an out entry containing a 2 byte VLAN ID. VLAN filterting is
218 * available with the VIRTIO_NET_F_CTRL_VLAN feature bit.
220 #define VIRTIO_NET_CTRL_VLAN 2
221 #define VIRTIO_NET_CTRL_VLAN_ADD 0
222 #define VIRTIO_NET_CTRL_VLAN_DEL 1
225 * Control link announce acknowledgment
227 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that driver has
228 * recevied the notification; device would clear the VIRTIO_NET_S_ANNOUNCE bit
229 * in the status field after it receives this command.
231 #define VIRTIO_NET_CTRL_ANNOUNCE 3
232 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
235 * Control receive flow steering
237 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables receive flow steering,
238 * specifying the number of the transmit and receive queues that will be used.
239 * After the command is consumed and acked by the device, the device will not
240 * steer new packets on receive virtqueues other than specified nor read from
241 * transmit virtqueues other than specified. Accordingly, driver should not
242 * transmit new packets on virtqueues other than specified.
244 struct virtio_net_ctrl_mq {
245 __virtio16 virtqueue_pairs;
248 #define VIRTIO_NET_CTRL_MQ 4
249 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
250 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
251 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
254 * Control network offloads
256 * Reconfigures the network offloads that guest can handle.
258 * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
260 * Command data format matches the feature bit mask exactly.
262 * See VIRTIO_NET_F_GUEST_* for the list of offloads
263 * that can be enabled/disabled.
265 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
266 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
268 #endif /* _LINUX_VIRTIO_NET_H */