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 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of IBM nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. */ 28 #include "standard-headers/linux/types.h" 29 #include "standard-headers/linux/virtio_ids.h" 30 #include "standard-headers/linux/virtio_config.h" 31 #include "standard-headers/linux/virtio_types.h" 32 #include "standard-headers/linux/if_ether.h" 33 34 /* The feature bitmap for virtio net */ 35 #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ 36 #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ 37 #define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Dynamic offload configuration. */ 38 #define VIRTIO_NET_F_MTU 3 /* Initial MTU advice */ 39 #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ 40 #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ 41 #define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */ 42 #define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */ 43 #define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */ 44 #define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */ 45 #define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */ 46 #define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */ 47 #define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */ 48 #define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */ 49 #define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */ 50 #define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */ 51 #define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */ 52 #define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */ 53 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */ 54 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the 55 * network */ 56 #define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow 57 * Steering */ 58 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */ 59 60 #define VIRTIO_NET_F_SPEED_DUPLEX 63 /* Device set linkspeed and duplex */ 61 62 #ifndef VIRTIO_NET_NO_LEGACY 63 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 64 #endif /* VIRTIO_NET_NO_LEGACY */ 65 66 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ 67 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ 68 69 struct virtio_net_config { 70 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 71 uint8_t mac[ETH_ALEN]; 72 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 73 uint16_t status; 74 /* Maximum number of each of transmit and receive queues; 75 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. 76 * Legal values are between 1 and 0x8000 77 */ 78 uint16_t max_virtqueue_pairs; 79 /* Default maximum transmit unit advice */ 80 uint16_t mtu; 81 /* 82 * speed, in units of 1Mb. All values 0 to INT_MAX are legal. 83 * Any other value stands for unknown. 84 */ 85 uint32_t speed; 86 /* 87 * 0x00 - half duplex 88 * 0x01 - full duplex 89 * Any other value stands for unknown. 90 */ 91 uint8_t duplex; 92 } QEMU_PACKED; 93 94 /* 95 * This header comes first in the scatter-gather list. If you don't 96 * specify GSO or CSUM features, you can simply ignore the header. 97 * 98 * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf, 99 * only flattened. 100 */ 101 struct virtio_net_hdr_v1 { 102 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */ 103 #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */ 104 uint8_t flags; 105 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */ 106 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */ 107 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */ 108 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */ 109 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */ 110 uint8_t gso_type; 111 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 112 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ 113 __virtio16 csum_start; /* Position to start checksumming from */ 114 __virtio16 csum_offset; /* Offset after that to place checksum */ 115 __virtio16 num_buffers; /* Number of merged rx buffers */ 116 }; 117 118 #ifndef VIRTIO_NET_NO_LEGACY 119 /* This header comes first in the scatter-gather list. 120 * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must 121 * be the first element of the scatter-gather list. If you don't 122 * specify GSO or CSUM features, you can simply ignore the header. */ 123 struct virtio_net_hdr { 124 /* See VIRTIO_NET_HDR_F_* */ 125 uint8_t flags; 126 /* See VIRTIO_NET_HDR_GSO_* */ 127 uint8_t gso_type; 128 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 129 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ 130 __virtio16 csum_start; /* Position to start checksumming from */ 131 __virtio16 csum_offset; /* Offset after that to place checksum */ 132 }; 133 134 /* This is the version of the header to use when the MRG_RXBUF 135 * feature has been negotiated. */ 136 struct virtio_net_hdr_mrg_rxbuf { 137 struct virtio_net_hdr hdr; 138 __virtio16 num_buffers; /* Number of merged rx buffers */ 139 }; 140 #endif /* ...VIRTIO_NET_NO_LEGACY */ 141 142 /* 143 * Control virtqueue data structures 144 * 145 * The control virtqueue expects a header in the first sg entry 146 * and an ack/status response in the last entry. Data for the 147 * command goes in between. 148 */ 149 struct virtio_net_ctrl_hdr { 150 uint8_t class; 151 uint8_t cmd; 152 } QEMU_PACKED; 153 154 typedef uint8_t virtio_net_ctrl_ack; 155 156 #define VIRTIO_NET_OK 0 157 #define VIRTIO_NET_ERR 1 158 159 /* 160 * Control the RX mode, ie. promisucous, allmulti, etc... 161 * All commands require an "out" sg entry containing a 1 byte 162 * state value, zero = disable, non-zero = enable. Commands 163 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. 164 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. 165 */ 166 #define VIRTIO_NET_CTRL_RX 0 167 #define VIRTIO_NET_CTRL_RX_PROMISC 0 168 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 169 #define VIRTIO_NET_CTRL_RX_ALLUNI 2 170 #define VIRTIO_NET_CTRL_RX_NOMULTI 3 171 #define VIRTIO_NET_CTRL_RX_NOUNI 4 172 #define VIRTIO_NET_CTRL_RX_NOBCAST 5 173 174 /* 175 * Control the MAC 176 * 177 * The MAC filter table is managed by the hypervisor, the guest should 178 * assume the size is infinite. Filtering should be considered 179 * non-perfect, ie. based on hypervisor resources, the guest may 180 * received packets from sources not specified in the filter list. 181 * 182 * In addition to the class/cmd header, the TABLE_SET command requires 183 * two out scatterlists. Each contains a 4 byte count of entries followed 184 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 185 * first sg list contains unicast addresses, the second is for multicast. 186 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 187 * is available. 188 * 189 * The ADDR_SET command requests one out scatterlist, it contains a 190 * 6 bytes MAC address. This functionality is present if the 191 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. 192 */ 193 struct virtio_net_ctrl_mac { 194 __virtio32 entries; 195 uint8_t macs[][ETH_ALEN]; 196 } QEMU_PACKED; 197 198 #define VIRTIO_NET_CTRL_MAC 1 199 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 200 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 201 202 /* 203 * Control VLAN filtering 204 * 205 * The VLAN filter table is controlled via a simple ADD/DEL interface. 206 * VLAN IDs not added may be filterd by the hypervisor. Del is the 207 * opposite of add. Both commands expect an out entry containing a 2 208 * byte VLAN ID. VLAN filterting is available with the 209 * VIRTIO_NET_F_CTRL_VLAN feature bit. 210 */ 211 #define VIRTIO_NET_CTRL_VLAN 2 212 #define VIRTIO_NET_CTRL_VLAN_ADD 0 213 #define VIRTIO_NET_CTRL_VLAN_DEL 1 214 215 /* 216 * Control link announce acknowledgement 217 * 218 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that 219 * driver has recevied the notification; device would clear the 220 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives 221 * this command. 222 */ 223 #define VIRTIO_NET_CTRL_ANNOUNCE 3 224 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 225 226 /* 227 * Control Receive Flow Steering 228 * 229 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 230 * enables Receive Flow Steering, specifying the number of the transmit and 231 * receive queues that will be used. After the command is consumed and acked by 232 * the device, the device will not steer new packets on receive virtqueues 233 * other than specified nor read from transmit virtqueues other than specified. 234 * Accordingly, driver should not transmit new packets on virtqueues other than 235 * specified. 236 */ 237 struct virtio_net_ctrl_mq { 238 __virtio16 virtqueue_pairs; 239 }; 240 241 #define VIRTIO_NET_CTRL_MQ 4 242 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 243 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 244 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 245 246 /* 247 * Control network offloads 248 * 249 * Reconfigures the network offloads that Guest can handle. 250 * 251 * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit. 252 * 253 * Command data format matches the feature bit mask exactly. 254 * 255 * See VIRTIO_NET_F_GUEST_* for the list of offloads 256 * that can be enabled/disabled. 257 */ 258 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 259 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 260 261 #endif /* _LINUX_VIRTIO_NET_H */ 262