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34 /* The feature bitmap for virtio net */
35 #define VIRTIO_NET_F_CSUM 0x00001 /* Host handles pkts w/ partial csum */
36 #define VIRTIO_NET_F_GUEST_CSUM 0x00002 /* Guest handles pkts w/ partial csum*/
37 #define VIRTIO_NET_F_MAC 0x00020 /* Host has given MAC address. */
38 #define VIRTIO_NET_F_GSO 0x00040 /* Host handles pkts w/ any GSO type */
39 #define VIRTIO_NET_F_GUEST_TSO4 0x00080 /* Guest can handle TSOv4 in. */
40 #define VIRTIO_NET_F_GUEST_TSO6 0x00100 /* Guest can handle TSOv6 in. */
41 #define VIRTIO_NET_F_GUEST_ECN 0x00200 /* Guest can handle TSO[6] w/ ECN in.*/
42 #define VIRTIO_NET_F_GUEST_UFO 0x00400 /* Guest can handle UFO in. */
43 #define VIRTIO_NET_F_HOST_TSO4 0x00800 /* Host can handle TSOv4 in. */
44 #define VIRTIO_NET_F_HOST_TSO6 0x01000 /* Host can handle TSOv6 in. */
45 #define VIRTIO_NET_F_HOST_ECN 0x02000 /* Host can handle TSO[6] w/ ECN in. */
46 #define VIRTIO_NET_F_HOST_UFO 0x04000 /* Host can handle UFO in. */
47 #define VIRTIO_NET_F_MRG_RXBUF 0x08000 /* Host can merge receive buffers. */
48 #define VIRTIO_NET_F_STATUS 0x10000 /* virtio_net_config.status available*/
49 #define VIRTIO_NET_F_CTRL_VQ 0x20000 /* Control channel available */
50 #define VIRTIO_NET_F_CTRL_RX 0x40000 /* Control channel RX mode support */
51 #define VIRTIO_NET_F_CTRL_VLAN 0x80000 /* Control channel VLAN filtering */
52 #define VIRTIO_NET_F_CTRL_RX_EXTRA 0x100000 /* Extra RX mode control support */
53 #define VIRTIO_NET_F_GUEST_ANNOUNCE 0x200000 /* Announce device on network */
54 #define VIRTIO_NET_F_MQ 0x400000 /* Device supports RFS */
55 #define VIRTIO_NET_F_CTRL_MAC_ADDR 0x800000 /* Set MAC address */
57 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
59 struct virtio_net_config {
60 /* The config defining mac address (if VIRTIO_NET_F_MAC) */
61 uint8_t mac[ETHER_ADDR_LEN];
62 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
64 /* Maximum number of each of transmit and receive queues;
65 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
66 * Legal values are between 1 and 0x8000.
68 uint16_t max_virtqueue_pairs;
72 * This is the first element of the scatter-gather list. If you don't
73 * specify GSO or CSUM features, you can simply ignore the header.
75 struct virtio_net_hdr {
76 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start,csum_offset*/
77 #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
79 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
80 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
81 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
82 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
83 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
85 uint16_t hdr_len; /* Ethernet + IP + tcp/udp hdrs */
86 uint16_t gso_size; /* Bytes to append to hdr_len per frame */
87 uint16_t csum_start; /* Position to start checksumming from */
88 uint16_t csum_offset; /* Offset after that to place checksum */
92 * This is the version of the header to use when the MRG_RXBUF
93 * feature has been negotiated.
95 struct virtio_net_hdr_mrg_rxbuf {
96 struct virtio_net_hdr hdr;
97 uint16_t num_buffers; /* Number of merged rx buffers */
101 * Control virtqueue data structures
103 * The control virtqueue expects a header in the first sg entry
104 * and an ack/status response in the last entry. Data for the
105 * command goes in between.
107 struct virtio_net_ctrl_hdr {
112 #define VIRTIO_NET_OK 0
113 #define VIRTIO_NET_ERR 1
116 * Control the RX mode, ie. promiscuous, allmulti, etc...
117 * All commands require an "out" sg entry containing a 1 byte
118 * state value, zero = disable, non-zero = enable. Commands
119 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
120 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
122 #define VIRTIO_NET_CTRL_RX 0
123 #define VIRTIO_NET_CTRL_RX_PROMISC 0
124 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1
125 #define VIRTIO_NET_CTRL_RX_ALLUNI 2
126 #define VIRTIO_NET_CTRL_RX_NOMULTI 3
127 #define VIRTIO_NET_CTRL_RX_NOUNI 4
128 #define VIRTIO_NET_CTRL_RX_NOBCAST 5
131 * Control the MAC filter table.
133 * The MAC filter table is managed by the hypervisor, the guest should
134 * assume the size is infinite. Filtering should be considered
135 * non-perfect, ie. based on hypervisor resources, the guest may
136 * received packets from sources not specified in the filter list.
138 * In addition to the class/cmd header, the TABLE_SET command requires
139 * two out scatterlists. Each contains a 4 byte count of entries followed
140 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The
141 * first sg list contains unicast addresses, the second is for multicast.
142 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
145 * The ADDR_SET command requests one out scatterlist, it contains a
146 * 6 bytes MAC address. This functionality is present if the
147 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
149 struct virtio_net_ctrl_mac {
151 uint8_t macs[][ETHER_ADDR_LEN];
154 #define VIRTIO_NET_CTRL_MAC 1
155 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
156 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1
159 * Control VLAN filtering
161 * The VLAN filter table is controlled via a simple ADD/DEL interface.
162 * VLAN IDs not added may be filtered by the hypervisor. Del is the
163 * opposite of add. Both commands expect an out entry containing a 2
164 * byte VLAN ID. VLAN filtering is available with the
165 * VIRTIO_NET_F_CTRL_VLAN feature bit.
167 #define VIRTIO_NET_CTRL_VLAN 2
168 #define VIRTIO_NET_CTRL_VLAN_ADD 0
169 #define VIRTIO_NET_CTRL_VLAN_DEL 1
172 * Control link announce acknowledgement
174 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
175 * driver has recevied the notification; device would clear the
176 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
179 #define VIRTIO_NET_CTRL_ANNOUNCE 3
180 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0
183 * Control Receive Flow Steering
185 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET enables Receive Flow
186 * Steering, specifying the number of the transmit and receive queues
187 * that will be used. After the command is consumed and acked by the
188 * device, the device will not steer new packets on receive virtqueues
189 * other than specified nor read from transmit virtqueues other than
190 * specified. Accordingly, driver should not transmit new packets on
191 * virtqueues other than specified.
193 struct virtio_net_ctrl_mq {
194 uint16_t virtqueue_pairs;
197 #define VIRTIO_NET_CTRL_MQ 4
198 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
199 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
200 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000
202 #endif /* _VIRTIO_NET_H */