include/standard-headers/linux/virtio_net.h

   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 #define VIRTIO_NET_F_NOTF_COAL  53      /* Device supports notifications coalescing */
  60 #define VIRTIO_NET_F_GUEST_USO4 54      /* Guest can handle USOv4 in. */
  61 #define VIRTIO_NET_F_GUEST_USO6 55      /* Guest can handle USOv6 in. */
  62 #define VIRTIO_NET_F_HOST_USO   56      /* Host can handle USO in. */
  63 #define VIRTIO_NET_F_HASH_REPORT  57    /* Supports hash report */
  64 #define VIRTIO_NET_F_GUEST_HDRLEN  59   /* Guest provides the exact hdr_len value. */
  65 #define VIRTIO_NET_F_RSS          60    /* Supports RSS RX steering */
  66 #define VIRTIO_NET_F_RSC_EXT      61    /* extended coalescing info */
  67 #define VIRTIO_NET_F_STANDBY      62    /* Act as standby for another device
  68                                          * with the same MAC.
  69                                          */
  70 #define VIRTIO_NET_F_SPEED_DUPLEX 63    /* Device set linkspeed and duplex */
  71
  72 #ifndef VIRTIO_NET_NO_LEGACY
  73 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
  74 #endif /* VIRTIO_NET_NO_LEGACY */
  75
  76 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  77 #define VIRTIO_NET_S_ANNOUNCE   2       /* Announcement is needed */
  78
  79 /* supported/enabled hash types */
  80 #define VIRTIO_NET_RSS_HASH_TYPE_IPv4          (1 << 0)
  81 #define VIRTIO_NET_RSS_HASH_TYPE_TCPv4         (1 << 1)
  82 #define VIRTIO_NET_RSS_HASH_TYPE_UDPv4         (1 << 2)
  83 #define VIRTIO_NET_RSS_HASH_TYPE_IPv6          (1 << 3)
  84 #define VIRTIO_NET_RSS_HASH_TYPE_TCPv6         (1 << 4)
  85 #define VIRTIO_NET_RSS_HASH_TYPE_UDPv6         (1 << 5)
  86 #define VIRTIO_NET_RSS_HASH_TYPE_IP_EX         (1 << 6)
  87 #define VIRTIO_NET_RSS_HASH_TYPE_TCP_EX        (1 << 7)
  88 #define VIRTIO_NET_RSS_HASH_TYPE_UDP_EX        (1 << 8)
  89
  90 struct virtio_net_config {
  91         /* The config defining mac address (if VIRTIO_NET_F_MAC) */
  92         uint8_t mac[ETH_ALEN];
  93         /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  94         __virtio16 status;
  95         /* Maximum number of each of transmit and receive queues;
  96          * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
  97          * Legal values are between 1 and 0x8000
  98          */
  99         __virtio16 max_virtqueue_pairs;
 100         /* Default maximum transmit unit advice */
 101         __virtio16 mtu;
 102         /*
 103          * speed, in units of 1Mb. All values 0 to INT_MAX are legal.
 104          * Any other value stands for unknown.
 105          */
 106         uint32_t speed;
 107         /*
 108          * 0x00 - half duplex
 109          * 0x01 - full duplex
 110          * Any other value stands for unknown.
 111          */
 112         uint8_t duplex;
 113         /* maximum size of RSS key */
 114         uint8_t rss_max_key_size;
 115         /* maximum number of indirection table entries */
 116         uint16_t rss_max_indirection_table_length;
 117         /* bitmask of supported VIRTIO_NET_RSS_HASH_ types */
 118         uint32_t supported_hash_types;
 119 } QEMU_PACKED;
 120
 121 /*
 122  * This header comes first in the scatter-gather list.  If you don't
 123  * specify GSO or CSUM features, you can simply ignore the header.
 124  *
 125  * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
 126  * only flattened.
 127  */
 128 struct virtio_net_hdr_v1 {
 129 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       /* Use csum_start, csum_offset */
 130 #define VIRTIO_NET_HDR_F_DATA_VALID     2       /* Csum is valid */
 131 #define VIRTIO_NET_HDR_F_RSC_INFO       4       /* rsc info in csum_ fields */
 132         uint8_t flags;
 133 #define VIRTIO_NET_HDR_GSO_NONE         0       /* Not a GSO frame */
 134 #define VIRTIO_NET_HDR_GSO_TCPV4        1       /* GSO frame, IPv4 TCP (TSO) */
 135 #define VIRTIO_NET_HDR_GSO_UDP          3       /* GSO frame, IPv4 UDP (UFO) */
 136 #define VIRTIO_NET_HDR_GSO_TCPV6        4       /* GSO frame, IPv6 TCP */
 137 #define VIRTIO_NET_HDR_GSO_UDP_L4       5       /* GSO frame, IPv4& IPv6 UDP (USO) */
 138 #define VIRTIO_NET_HDR_GSO_ECN          0x80    /* TCP has ECN set */
 139         uint8_t gso_type;
 140         __virtio16 hdr_len;     /* Ethernet + IP + tcp/udp hdrs */
 141         __virtio16 gso_size;    /* Bytes to append to hdr_len per frame */
 142         union {
 143                 struct {
 144                         __virtio16 csum_start;
 145                         __virtio16 csum_offset;
 146                 };
 147                 /* Checksum calculation */
 148                 struct {
 149                         /* Position to start checksumming from */
 150                         __virtio16 start;
 151                         /* Offset after that to place checksum */
 152                         __virtio16 offset;
 153                 } csum;
 154                 /* Receive Segment Coalescing */
 155                 struct {
 156                         /* Number of coalesced segments */
 157                         uint16_t segments;
 158                         /* Number of duplicated acks */
 159                         uint16_t dup_acks;
 160                 } rsc;
 161         };
 162         __virtio16 num_buffers; /* Number of merged rx buffers */
 163 };
 164
 165 struct virtio_net_hdr_v1_hash {
 166         struct virtio_net_hdr_v1 hdr;
 167         uint32_t hash_value;
 168 #define VIRTIO_NET_HASH_REPORT_NONE            0
 169 #define VIRTIO_NET_HASH_REPORT_IPv4            1
 170 #define VIRTIO_NET_HASH_REPORT_TCPv4           2
 171 #define VIRTIO_NET_HASH_REPORT_UDPv4           3
 172 #define VIRTIO_NET_HASH_REPORT_IPv6            4
 173 #define VIRTIO_NET_HASH_REPORT_TCPv6           5
 174 #define VIRTIO_NET_HASH_REPORT_UDPv6           6
 175 #define VIRTIO_NET_HASH_REPORT_IPv6_EX         7
 176 #define VIRTIO_NET_HASH_REPORT_TCPv6_EX        8
 177 #define VIRTIO_NET_HASH_REPORT_UDPv6_EX        9
 178         uint16_t hash_report;
 179         uint16_t padding;
 180 };
 181
 182 #ifndef VIRTIO_NET_NO_LEGACY
 183 /* This header comes first in the scatter-gather list.
 184  * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
 185  * be the first element of the scatter-gather list.  If you don't
 186  * specify GSO or CSUM features, you can simply ignore the header. */
 187 struct virtio_net_hdr {
 188         /* See VIRTIO_NET_HDR_F_* */
 189         uint8_t flags;
 190         /* See VIRTIO_NET_HDR_GSO_* */
 191         uint8_t gso_type;
 192         __virtio16 hdr_len;             /* Ethernet + IP + tcp/udp hdrs */
 193         __virtio16 gso_size;            /* Bytes to append to hdr_len per frame */
 194         __virtio16 csum_start;  /* Position to start checksumming from */
 195         __virtio16 csum_offset; /* Offset after that to place checksum */
 196 };
 197
 198 /* This is the version of the header to use when the MRG_RXBUF
 199  * feature has been negotiated. */
 200 struct virtio_net_hdr_mrg_rxbuf {
 201         struct virtio_net_hdr hdr;
 202         __virtio16 num_buffers; /* Number of merged rx buffers */
 203 };
 204 #endif /* ...VIRTIO_NET_NO_LEGACY */
 205
 206 /*
 207  * Control virtqueue data structures
 208  *
 209  * The control virtqueue expects a header in the first sg entry
 210  * and an ack/status response in the last entry.  Data for the
 211  * command goes in between.
 212  */
 213 struct virtio_net_ctrl_hdr {
 214         uint8_t class;
 215         uint8_t cmd;
 216 } QEMU_PACKED;
 217
 218 typedef uint8_t virtio_net_ctrl_ack;
 219
 220 #define VIRTIO_NET_OK     0
 221 #define VIRTIO_NET_ERR    1
 222
 223 /*
 224  * Control the RX mode, ie. promisucous, allmulti, etc...
 225  * All commands require an "out" sg entry containing a 1 byte
 226  * state value, zero = disable, non-zero = enable.  Commands
 227  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
 228  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
 229  */
 230 #define VIRTIO_NET_CTRL_RX    0
 231  #define VIRTIO_NET_CTRL_RX_PROMISC      0
 232  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
 233  #define VIRTIO_NET_CTRL_RX_ALLUNI       2
 234  #define VIRTIO_NET_CTRL_RX_NOMULTI      3
 235  #define VIRTIO_NET_CTRL_RX_NOUNI        4
 236  #define VIRTIO_NET_CTRL_RX_NOBCAST      5
 237
 238 /*
 239  * Control the MAC
 240  *
 241  * The MAC filter table is managed by the hypervisor, the guest should
 242  * assume the size is infinite.  Filtering should be considered
 243  * non-perfect, ie. based on hypervisor resources, the guest may
 244  * received packets from sources not specified in the filter list.
 245  *
 246  * In addition to the class/cmd header, the TABLE_SET command requires
 247  * two out scatterlists.  Each contains a 4 byte count of entries followed
 248  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 249  * first sg list contains unicast addresses, the second is for multicast.
 250  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 251  * is available.
 252  *
 253  * The ADDR_SET command requests one out scatterlist, it contains a
 254  * 6 bytes MAC address. This functionality is present if the
 255  * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
 256  */
 257 struct virtio_net_ctrl_mac {
 258         __virtio32 entries;
 259         uint8_t macs[][ETH_ALEN];
 260 } QEMU_PACKED;
 261
 262 #define VIRTIO_NET_CTRL_MAC    1
 263  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 264  #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
 265
 266 /*
 267  * Control VLAN filtering
 268  *
 269  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 270  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
 271  * opposite of add.  Both commands expect an out entry containing a 2
 272  * byte VLAN ID.  VLAN filterting is available with the
 273  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 274  */
 275 #define VIRTIO_NET_CTRL_VLAN       2
 276  #define VIRTIO_NET_CTRL_VLAN_ADD             0
 277  #define VIRTIO_NET_CTRL_VLAN_DEL             1
 278
 279 /*
 280  * Control link announce acknowledgement
 281  *
 282  * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
 283  * driver has recevied the notification; device would clear the
 284  * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
 285  * this command.
 286  */
 287 #define VIRTIO_NET_CTRL_ANNOUNCE       3
 288  #define VIRTIO_NET_CTRL_ANNOUNCE_ACK         0
 289
 290 /*
 291  * Control Receive Flow Steering
 292  */
 293 #define VIRTIO_NET_CTRL_MQ   4
 294 /*
 295  * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
 296  * enables Receive Flow Steering, specifying the number of the transmit and
 297  * receive queues that will be used. After the command is consumed and acked by
 298  * the device, the device will not steer new packets on receive virtqueues
 299  * other than specified nor read from transmit virtqueues other than specified.
 300  * Accordingly, driver should not transmit new packets  on virtqueues other than
 301  * specified.
 302  */
 303 struct virtio_net_ctrl_mq {
 304         __virtio16 virtqueue_pairs;
 305 };
 306
 307  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
 308  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
 309  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
 310
 311 /*
 312  * The command VIRTIO_NET_CTRL_MQ_RSS_CONFIG has the same effect as
 313  * VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET does and additionally configures
 314  * the receive steering to use a hash calculated for incoming packet
 315  * to decide on receive virtqueue to place the packet. The command
 316  * also provides parameters to calculate a hash and receive virtqueue.
 317  */
 318 struct virtio_net_rss_config {
 319         uint32_t hash_types;
 320         uint16_t indirection_table_mask;
 321         uint16_t unclassified_queue;
 322         uint16_t indirection_table[1/* + indirection_table_mask */];
 323         uint16_t max_tx_vq;
 324         uint8_t hash_key_length;
 325         uint8_t hash_key_data[/* hash_key_length */];
 326 };
 327
 328  #define VIRTIO_NET_CTRL_MQ_RSS_CONFIG          1
 329
 330 /*
 331  * The command VIRTIO_NET_CTRL_MQ_HASH_CONFIG requests the device
 332  * to include in the virtio header of the packet the value of the
 333  * calculated hash and the report type of hash. It also provides
 334  * parameters for hash calculation. The command requires feature
 335  * VIRTIO_NET_F_HASH_REPORT to be negotiated to extend the
 336  * layout of virtio header as defined in virtio_net_hdr_v1_hash.
 337  */
 338 struct virtio_net_hash_config {
 339         uint32_t hash_types;
 340         /* for compatibility with virtio_net_rss_config */
 341         uint16_t reserved[4];
 342         uint8_t hash_key_length;
 343         uint8_t hash_key_data[/* hash_key_length */];
 344 };
 345
 346  #define VIRTIO_NET_CTRL_MQ_HASH_CONFIG         2
 347
 348 /*
 349  * Control network offloads
 350  *
 351  * Reconfigures the network offloads that Guest can handle.
 352  *
 353  * Available with the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS feature bit.
 354  *
 355  * Command data format matches the feature bit mask exactly.
 356  *
 357  * See VIRTIO_NET_F_GUEST_* for the list of offloads
 358  * that can be enabled/disabled.
 359  */
 360 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS   5
 361 #define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET        0
 362
 363 /*
 364  * Control notifications coalescing.
 365  *
 366  * Request the device to change the notifications coalescing parameters.
 367  *
 368  * Available with the VIRTIO_NET_F_NOTF_COAL feature bit.
 369  */
 370 #define VIRTIO_NET_CTRL_NOTF_COAL               6
 371 /*
 372  * Set the tx-usecs/tx-max-packets parameters.
 373  */
 374 struct virtio_net_ctrl_coal_tx {
 375         /* Maximum number of packets to send before a TX notification */
 376         uint32_t tx_max_packets;
 377         /* Maximum number of usecs to delay a TX notification */
 378         uint32_t tx_usecs;
 379 };
 380
 381 #define VIRTIO_NET_CTRL_NOTF_COAL_TX_SET                0
 382
 383 /*
 384  * Set the rx-usecs/rx-max-packets parameters.
 385  */
 386 struct virtio_net_ctrl_coal_rx {
 387         /* Maximum number of packets to receive before a RX notification */
 388         uint32_t rx_max_packets;
 389         /* Maximum number of usecs to delay a RX notification */
 390         uint32_t rx_usecs;
 391 };
 392
 393 #define VIRTIO_NET_CTRL_NOTF_COAL_RX_SET                1
 394
 395 #endif /* _LINUX_VIRTIO_NET_H */