2 * Virtio Network Device
4 * Copyright IBM, Corp. 2007
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 */
44 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
45 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
46 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
48 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
50 #define TX_TIMER_INTERVAL 150000 /* 150 us */
52 typedef struct virtio_net_conf
57 /* Maximum packet size we can receive from tap device: header + 64k */
58 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
60 struct virtio_net_config
62 /* The config defining mac address ($ETH_ALEN bytes) */
63 uint8_t mac[ETH_ALEN];
64 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
66 } __attribute__((packed));
68 /* This is the first element of the scatter-gather list. If you don't
69 * specify GSO or CSUM features, you can simply ignore the header. */
72 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 // Use csum_start, csum_offset
74 #define VIRTIO_NET_HDR_GSO_NONE 0 // Not a GSO frame
75 #define VIRTIO_NET_HDR_GSO_TCPV4 1 // GSO frame, IPv4 TCP (TSO)
76 #define VIRTIO_NET_HDR_GSO_UDP 3 // GSO frame, IPv4 UDP (UFO)
77 #define VIRTIO_NET_HDR_GSO_TCPV6 4 // GSO frame, IPv6 TCP
78 #define VIRTIO_NET_HDR_GSO_ECN 0x80 // TCP has ECN set
86 /* This is the version of the header to use when the MRG_RXBUF
87 * feature has been negotiated. */
88 struct virtio_net_hdr_mrg_rxbuf
90 struct virtio_net_hdr hdr;
91 uint16_t num_buffers; /* Number of merged rx buffers */
95 * Control virtqueue data structures
97 * The control virtqueue expects a header in the first sg entry
98 * and an ack/status response in the last entry. Data for the
99 * command goes in between.
101 struct virtio_net_ctrl_hdr {
106 typedef uint8_t virtio_net_ctrl_ack;
108 #define VIRTIO_NET_OK 0
109 #define VIRTIO_NET_ERR 1
112 * Control the RX mode, ie. promisucous, allmulti, etc...
113 * All commands require an "out" sg entry containing a 1 byte
114 * state value, zero = disable, non-zero = enable. Commands
115 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
116 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
118 #define VIRTIO_NET_CTRL_RX_MODE 0
119 #define VIRTIO_NET_CTRL_RX_MODE_PROMISC 0
120 #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI 1
121 #define VIRTIO_NET_CTRL_RX_MODE_ALLUNI 2
122 #define VIRTIO_NET_CTRL_RX_MODE_NOMULTI 3
123 #define VIRTIO_NET_CTRL_RX_MODE_NOUNI 4
124 #define VIRTIO_NET_CTRL_RX_MODE_NOBCAST 5
127 * Control the MAC filter table.
129 * The MAC filter table is managed by the hypervisor, the guest should
130 * assume the size is infinite. Filtering should be considered
131 * non-perfect, ie. based on hypervisor resources, the guest may
132 * received packets from sources not specified in the filter list.
134 * In addition to the class/cmd header, the TABLE_SET command requires
135 * two out scatterlists. Each contains a 4 byte count of entries followed
136 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The
137 * first sg list contains unicast addresses, the second is for multicast.
138 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
141 struct virtio_net_ctrl_mac {
143 uint8_t macs[][ETH_ALEN];
145 #define VIRTIO_NET_CTRL_MAC 1
146 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
149 * Control VLAN filtering
151 * The VLAN filter table is controlled via a simple ADD/DEL interface.
152 * VLAN IDs not added may be filterd by the hypervisor. Del is the
153 * opposite of add. Both commands expect an out entry containing a 2
154 * byte VLAN ID. VLAN filterting is available with the
155 * VIRTIO_NET_F_CTRL_VLAN feature bit.
157 #define VIRTIO_NET_CTRL_VLAN 2
158 #define VIRTIO_NET_CTRL_VLAN_ADD 0
159 #define VIRTIO_NET_CTRL_VLAN_DEL 1
161 #define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
162 DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
163 DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \
164 DEFINE_PROP_BIT("guest_csum", _state, _field, VIRTIO_NET_F_GUEST_CSUM, true), \
165 DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO, true), \
166 DEFINE_PROP_BIT("guest_tso4", _state, _field, VIRTIO_NET_F_GUEST_TSO4, true), \
167 DEFINE_PROP_BIT("guest_tso6", _state, _field, VIRTIO_NET_F_GUEST_TSO6, true), \
168 DEFINE_PROP_BIT("guest_ecn", _state, _field, VIRTIO_NET_F_GUEST_ECN, true), \
169 DEFINE_PROP_BIT("guest_ufo", _state, _field, VIRTIO_NET_F_GUEST_UFO, true), \
170 DEFINE_PROP_BIT("host_tso4", _state, _field, VIRTIO_NET_F_HOST_TSO4, true), \
171 DEFINE_PROP_BIT("host_tso6", _state, _field, VIRTIO_NET_F_HOST_TSO6, true), \
172 DEFINE_PROP_BIT("host_ecn", _state, _field, VIRTIO_NET_F_HOST_ECN, true), \
173 DEFINE_PROP_BIT("host_ufo", _state, _field, VIRTIO_NET_F_HOST_UFO, true), \
174 DEFINE_PROP_BIT("mrg_rxbuf", _state, _field, VIRTIO_NET_F_MRG_RXBUF, true), \
175 DEFINE_PROP_BIT("status", _state, _field, VIRTIO_NET_F_STATUS, true), \
176 DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \
177 DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \
178 DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \
179 DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true)