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_STANDBY 62 /* Act as standby for another device 61 * with the same MAC. 62 */ 63 #define VIRTIO_NET_F_SPEED_DUPLEX 63 /* Device set linkspeed and duplex */ 64 65 #ifndef VIRTIO_NET_NO_LEGACY 66 #define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */ 67 #endif /* VIRTIO_NET_NO_LEGACY */ 68 69 #define VIRTIO_NET_S_LINK_UP 1 /* Link is up */ 70 #define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */ 71 72 struct virtio_net_config { 73 /* The config defining mac address (if VIRTIO_NET_F_MAC) */ 74 uint8_t mac[ETH_ALEN]; 75 /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */ 76 uint16_t status; 77 /* Maximum number of each of transmit and receive queues; 78 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ. 79 * Legal values are between 1 and 0x8000 80 */ 81 uint16_t max_virtqueue_pairs; 82 /* Default maximum transmit unit advice */ 83 uint16_t mtu; 84 /* 85 * speed, in units of 1Mb. All values 0 to INT_MAX are legal. 86 * Any other value stands for unknown. 87 */ 88 uint32_t speed; 89 /* 90 * 0x00 - half duplex 91 * 0x01 - full duplex 92 * Any other value stands for unknown. 93 */ 94 uint8_t duplex; 95 } QEMU_PACKED; 96 97 /* 98 * This header comes first in the scatter-gather list. If you don't 99 * specify GSO or CSUM features, you can simply ignore the header. 100 * 101 * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf, 102 * only flattened. 103 */ 104 struct virtio_net_hdr_v1 { 105 #define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */ 106 #define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */ 107 uint8_t flags; 108 #define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */ 109 #define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */ 110 #define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */ 111 #define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */ 112 #define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */ 113 uint8_t gso_type; 114 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 115 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ 116 __virtio16 csum_start; /* Position to start checksumming from */ 117 __virtio16 csum_offset; /* Offset after that to place checksum */ 118 __virtio16 num_buffers; /* Number of merged rx buffers */ 119 }; 120 121 #ifndef VIRTIO_NET_NO_LEGACY 122 /* This header comes first in the scatter-gather list. 123 * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must 124 * be the first element of the scatter-gather list. If you don't 125 * specify GSO or CSUM features, you can simply ignore the header. */ 126 struct virtio_net_hdr { 127 /* See VIRTIO_NET_HDR_F_* */ 128 uint8_t flags; 129 /* See VIRTIO_NET_HDR_GSO_* */ 130 uint8_t gso_type; 131 __virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */ 132 __virtio16 gso_size; /* Bytes to append to hdr_len per frame */ 133 __virtio16 csum_start; /* Position to start checksumming from */ 134 __virtio16 csum_offset; /* Offset after that to place checksum */ 135 }; 136 137 /* This is the version of the header to use when the MRG_RXBUF 138 * feature has been negotiated. */ 139 struct virtio_net_hdr_mrg_rxbuf { 140 struct virtio_net_hdr hdr; 141 __virtio16 num_buffers; /* Number of merged rx buffers */ 142 }; 143 #endif /* ...VIRTIO_NET_NO_LEGACY */ 144 145 /* 146 * Control virtqueue data structures 147 * 148 * The control virtqueue expects a header in the first sg entry 149 * and an ack/status response in the last entry. Data for the 150 * command goes in between. 151 */ 152 struct virtio_net_ctrl_hdr { 153 uint8_t class; 154 uint8_t cmd; 155 } QEMU_PACKED; 156 157 typedef uint8_t virtio_net_ctrl_ack; 158 159 #define VIRTIO_NET_OK 0 160 #define VIRTIO_NET_ERR 1 161 162 /* 163 * Control the RX mode, ie. promisucous, allmulti, etc... 164 * All commands require an "out" sg entry containing a 1 byte 165 * state value, zero = disable, non-zero = enable. Commands 166 * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature. 167 * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA. 168 */ 169 #define VIRTIO_NET_CTRL_RX 0 170 #define VIRTIO_NET_CTRL_RX_PROMISC 0 171 #define VIRTIO_NET_CTRL_RX_ALLMULTI 1 172 #define VIRTIO_NET_CTRL_RX_ALLUNI 2 173 #define VIRTIO_NET_CTRL_RX_NOMULTI 3 174 #define VIRTIO_NET_CTRL_RX_NOUNI 4 175 #define VIRTIO_NET_CTRL_RX_NOBCAST 5 176 177 /* 178 * Control the MAC 179 * 180 * The MAC filter table is managed by the hypervisor, the guest should 181 * assume the size is infinite. Filtering should be considered 182 * non-perfect, ie. based on hypervisor resources, the guest may 183 * received packets from sources not specified in the filter list. 184 * 185 * In addition to the class/cmd header, the TABLE_SET command requires 186 * two out scatterlists. Each contains a 4 byte count of entries followed 187 * by a concatenated byte stream of the ETH_ALEN MAC addresses. The 188 * first sg list contains unicast addresses, the second is for multicast. 189 * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature 190 * is available. 191 * 192 * The ADDR_SET command requests one out scatterlist, it contains a 193 * 6 bytes MAC address. This functionality is present if the 194 * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available. 195 */ 196 struct virtio_net_ctrl_mac { 197 __virtio32 entries; 198 uint8_t macs[][ETH_ALEN]; 199 } QEMU_PACKED; 200 201 #define VIRTIO_NET_CTRL_MAC 1 202 #define VIRTIO_NET_CTRL_MAC_TABLE_SET 0 203 #define VIRTIO_NET_CTRL_MAC_ADDR_SET 1 204 205 /* 206 * Control VLAN filtering 207 * 208 * The VLAN filter table is controlled via a simple ADD/DEL interface. 209 * VLAN IDs not added may be filterd by the hypervisor. Del is the 210 * opposite of add. Both commands expect an out entry containing a 2 211 * byte VLAN ID. VLAN filterting is available with the 212 * VIRTIO_NET_F_CTRL_VLAN feature bit. 213 */ 214 #define VIRTIO_NET_CTRL_VLAN 2 215 #define VIRTIO_NET_CTRL_VLAN_ADD 0 216 #define VIRTIO_NET_CTRL_VLAN_DEL 1 217 218 /* 219 * Control link announce acknowledgement 220 * 221 * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that 222 * driver has recevied the notification; device would clear the 223 * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives 224 * this command. 225 */ 226 #define VIRTIO_NET_CTRL_ANNOUNCE 3 227 #define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0 228 229 /* 230 * Control Receive Flow Steering 231 * 232 * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 233 * enables Receive Flow Steering, specifying the number of the transmit and 234 * receive queues that will be used. After the command is consumed and acked by 235 * the device, the device will not steer new packets on receive virtqueues 236 * other than specified nor read from transmit virtqueues other than specified. 237 * Accordingly, driver should not transmit new packets on virtqueues other than 238 * specified. 239 */ 240 struct virtio_net_ctrl_mq { 241 __virtio16 virtqueue_pairs; 242 }; 243 244 #define VIRTIO_NET_CTRL_MQ 4 245 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0 246 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1 247 #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000 248 249 /* 250 * Control network offloads 251 * 252 * Reconfigures the network offloads that Guest can handle. 253 * 254 * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit. 255 * 256 * Command data format matches the feature bit mask exactly. 257 * 258 * See VIRTIO_NET_F_GUEST_* for the list of offloads 259 * that can be enabled/disabled. 260 */ 261 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5 262 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0 263 264 #endif /* _LINUX_VIRTIO_NET_H */ 265