hw/virtio-net.h

   1 /*
   2  * Virtio Network Device
   3  *
   4  * Copyright IBM, Corp. 2007
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #ifndef _QEMU_VIRTIO_NET_H
  15 #define _QEMU_VIRTIO_NET_H
  16
  17 #include "virtio.h"
  18 #include "pci/pci.h"
  19
  20 #define ETH_ALEN    6
  21
  22 /* from Linux's virtio_net.h */
  23
  24 /* The ID for virtio_net */
  25 #define VIRTIO_ID_NET   1
  26
  27 /* The feature bitmap for virtio net */
  28 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
  29 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
  30 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
  31 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
  32 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
  33 #define VIRTIO_NET_F_GUEST_TSO6 8       /* Guest can handle TSOv6 in. */
  34 #define VIRTIO_NET_F_GUEST_ECN  9       /* Guest can handle TSO[6] w/ ECN in. */
  35 #define VIRTIO_NET_F_GUEST_UFO  10      /* Guest can handle UFO in. */
  36 #define VIRTIO_NET_F_HOST_TSO4  11      /* Host can handle TSOv4 in. */
  37 #define VIRTIO_NET_F_HOST_TSO6  12      /* Host can handle TSOv6 in. */
  38 #define VIRTIO_NET_F_HOST_ECN   13      /* Host can handle TSO[6] w/ ECN in. */
  39 #define VIRTIO_NET_F_HOST_UFO   14      /* Host can handle UFO in. */
  40 #define VIRTIO_NET_F_MRG_RXBUF  15      /* Host can merge receive buffers. */
  41 #define VIRTIO_NET_F_STATUS     16      /* virtio_net_config.status available */
  42 #define VIRTIO_NET_F_CTRL_VQ    17      /* Control channel available */
  43 #define VIRTIO_NET_F_CTRL_RX    18      /* Control channel RX mode support */
  44 #define VIRTIO_NET_F_CTRL_VLAN  19      /* Control channel VLAN filtering */
  45 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20   /* Extra RX mode control support */
  46 #define VIRTIO_NET_F_MQ         22      /* Device supports Receive Flow
  47                                          * Steering */
  48
  49 #define VIRTIO_NET_F_CTRL_MAC_ADDR   23 /* Set MAC address */
  50
  51 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  52
  53 #define TX_TIMER_INTERVAL 150000 /* 150 us */
  54
  55 /* Limit the number of packets that can be sent via a single flush
  56  * of the TX queue.  This gives us a guaranteed exit condition and
  57  * ensures fairness in the io path.  256 conveniently matches the
  58  * length of the TX queue and shows a good balance of performance
  59  * and latency. */
  60 #define TX_BURST 256
  61
  62 typedef struct virtio_net_conf
  63 {
  64     uint32_t txtimer;
  65     int32_t txburst;
  66     char *tx;
  67 } virtio_net_conf;
  68
  69 /* Maximum packet size we can receive from tap device: header + 64k */
  70 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
  71
  72 struct virtio_net_config
  73 {
  74     /* The config defining mac address ($ETH_ALEN bytes) */
  75     uint8_t mac[ETH_ALEN];
  76     /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  77     uint16_t status;
  78     /* Max virtqueue pairs supported by the device */
  79     uint16_t max_virtqueue_pairs;
  80 } QEMU_PACKED;
  81
  82 /*
  83  * Control virtqueue data structures
  84  *
  85  * The control virtqueue expects a header in the first sg entry
  86  * and an ack/status response in the last entry.  Data for the
  87  * command goes in between.
  88  */
  89 struct virtio_net_ctrl_hdr {
  90     uint8_t class;
  91     uint8_t cmd;
  92 };
  93
  94 typedef uint8_t virtio_net_ctrl_ack;
  95
  96 #define VIRTIO_NET_OK     0
  97 #define VIRTIO_NET_ERR    1
  98
  99 /*
 100  * Control the RX mode, ie. promisucous, allmulti, etc...
 101  * All commands require an "out" sg entry containing a 1 byte
 102  * state value, zero = disable, non-zero = enable.  Commands
 103  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
 104  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
 105  */
 106 #define VIRTIO_NET_CTRL_RX    0
 107  #define VIRTIO_NET_CTRL_RX_PROMISC      0
 108  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
 109  #define VIRTIO_NET_CTRL_RX_ALLUNI       2
 110  #define VIRTIO_NET_CTRL_RX_NOMULTI      3
 111  #define VIRTIO_NET_CTRL_RX_NOUNI        4
 112  #define VIRTIO_NET_CTRL_RX_NOBCAST      5
 113
 114 /*
 115  * Control the MAC
 116  *
 117  * The MAC filter table is managed by the hypervisor, the guest should
 118  * assume the size is infinite.  Filtering should be considered
 119  * non-perfect, ie. based on hypervisor resources, the guest may
 120  * received packets from sources not specified in the filter list.
 121  *
 122  * In addition to the class/cmd header, the TABLE_SET command requires
 123  * two out scatterlists.  Each contains a 4 byte count of entries followed
 124  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 125  * first sg list contains unicast addresses, the second is for multicast.
 126  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 127  * is available.
 128  *
 129  * The ADDR_SET command requests one out scatterlist, it contains a
 130  * 6 bytes MAC address. This functionality is present if the
 131  * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
 132  */
 133 struct virtio_net_ctrl_mac {
 134     uint32_t entries;
 135     uint8_t macs[][ETH_ALEN];
 136 };
 137 #define VIRTIO_NET_CTRL_MAC    1
 138  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 139  #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1
 140
 141 /*
 142  * Control VLAN filtering
 143  *
 144  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 145  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
 146  * opposite of add.  Both commands expect an out entry containing a 2
 147  * byte VLAN ID.  VLAN filterting is available with the
 148  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 149  */
 150 #define VIRTIO_NET_CTRL_VLAN       2
 151  #define VIRTIO_NET_CTRL_VLAN_ADD             0
 152  #define VIRTIO_NET_CTRL_VLAN_DEL             1
 153
 154 /*
 155  * Control Multiqueue
 156  *
 157  * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
 158  * enables multiqueue, specifying the number of the transmit and
 159  * receive queues that will be used. After the command is consumed and acked by
 160  * the device, the device will not steer new packets on receive virtqueues
 161  * other than specified nor read from transmit virtqueues other than specified.
 162  * Accordingly, driver should not transmit new packets  on virtqueues other than
 163  * specified.
 164  */
 165 struct virtio_net_ctrl_mq {
 166     uint16_t virtqueue_pairs;
 167 };
 168
 169 #define VIRTIO_NET_CTRL_MQ   4
 170  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
 171  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
 172  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000
 173
 174 #define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \
 175         DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \
 176         DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \
 177         DEFINE_PROP_BIT("guest_csum", _state, _field, VIRTIO_NET_F_GUEST_CSUM, true), \
 178         DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO, true), \
 179         DEFINE_PROP_BIT("guest_tso4", _state, _field, VIRTIO_NET_F_GUEST_TSO4, true), \
 180         DEFINE_PROP_BIT("guest_tso6", _state, _field, VIRTIO_NET_F_GUEST_TSO6, true), \
 181         DEFINE_PROP_BIT("guest_ecn", _state, _field, VIRTIO_NET_F_GUEST_ECN, true), \
 182         DEFINE_PROP_BIT("guest_ufo", _state, _field, VIRTIO_NET_F_GUEST_UFO, true), \
 183         DEFINE_PROP_BIT("host_tso4", _state, _field, VIRTIO_NET_F_HOST_TSO4, true), \
 184         DEFINE_PROP_BIT("host_tso6", _state, _field, VIRTIO_NET_F_HOST_TSO6, true), \
 185         DEFINE_PROP_BIT("host_ecn", _state, _field, VIRTIO_NET_F_HOST_ECN, true), \
 186         DEFINE_PROP_BIT("host_ufo", _state, _field, VIRTIO_NET_F_HOST_UFO, true), \
 187         DEFINE_PROP_BIT("mrg_rxbuf", _state, _field, VIRTIO_NET_F_MRG_RXBUF, true), \
 188         DEFINE_PROP_BIT("status", _state, _field, VIRTIO_NET_F_STATUS, true), \
 189         DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \
 190         DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \
 191         DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \
 192         DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true), \
 193         DEFINE_PROP_BIT("ctrl_mac_addr", _state, _field, VIRTIO_NET_F_CTRL_MAC_ADDR, true), \
 194         DEFINE_PROP_BIT("mq", _state, _field, VIRTIO_NET_F_MQ, false)
 195
 196 #endif