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 "net.h"
  19 #include "pci.h"
  20
  21 #define ETH_ALEN    6
  22
  23 /* from Linux's virtio_net.h */
  24
  25 /* The ID for virtio_net */
  26 #define VIRTIO_ID_NET   1
  27
  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
  47 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  48
  49 #define TX_TIMER_INTERVAL 150000 /* 150 us */
  50
  51 /* Maximum packet size we can receive from tap device: header + 64k */
  52 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
  53
  54 struct virtio_net_config
  55 {
  56     /* The config defining mac address (6 bytes) */
  57     uint8_t mac[6];
  58     /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  59     uint16_t status;
  60 } __attribute__((packed));
  61
  62 /* This is the first element of the scatter-gather list.  If you don't
  63  * specify GSO or CSUM features, you can simply ignore the header. */
  64 struct virtio_net_hdr
  65 {
  66 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset
  67     uint8_t flags;
  68 #define VIRTIO_NET_HDR_GSO_NONE         0       // Not a GSO frame
  69 #define VIRTIO_NET_HDR_GSO_TCPV4        1       // GSO frame, IPv4 TCP (TSO)
  70 #define VIRTIO_NET_HDR_GSO_UDP          3       // GSO frame, IPv4 UDP (UFO)
  71 #define VIRTIO_NET_HDR_GSO_TCPV6        4       // GSO frame, IPv6 TCP
  72 #define VIRTIO_NET_HDR_GSO_ECN          0x80    // TCP has ECN set
  73     uint8_t gso_type;
  74     uint16_t hdr_len;
  75     uint16_t gso_size;
  76     uint16_t csum_start;
  77     uint16_t csum_offset;
  78 };
  79
  80 /* This is the version of the header to use when the MRG_RXBUF
  81  * feature has been negotiated. */
  82 struct virtio_net_hdr_mrg_rxbuf
  83 {
  84     struct virtio_net_hdr hdr;
  85     uint16_t num_buffers;   /* Number of merged rx buffers */
  86 };
  87
  88 /*
  89  * Control virtqueue data structures
  90  *
  91  * The control virtqueue expects a header in the first sg entry
  92  * and an ack/status response in the last entry.  Data for the
  93  * command goes in between.
  94  */
  95 struct virtio_net_ctrl_hdr {
  96     uint8_t class;
  97     uint8_t cmd;
  98 };
  99
 100 typedef uint8_t virtio_net_ctrl_ack;
 101
 102 #define VIRTIO_NET_OK     0
 103 #define VIRTIO_NET_ERR    1
 104
 105 /*
 106  * Control the RX mode, ie. promisucous and allmulti.  PROMISC and
 107  * ALLMULTI commands require an "out" sg entry containing a 1 byte
 108  * state value, zero = disable, non-zero = enable.  These commands
 109  * are supported with the VIRTIO_NET_F_CTRL_RX feature.
 110  */
 111 #define VIRTIO_NET_CTRL_RX_MODE    0
 112  #define VIRTIO_NET_CTRL_RX_MODE_PROMISC      0
 113  #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI     1
 114
 115 /*
 116  * Control the MAC filter table.
 117  *
 118  * The MAC filter table is managed by the hypervisor, the guest should
 119  * assume the size is infinite.  Filtering should be considered
 120  * non-perfect, ie. based on hypervisor resources, the guest may
 121  * received packets from sources not specified in the filter list.
 122  *
 123  * In addition to the class/cmd header, the TABLE_SET command requires
 124  * two out scatterlists.  Each contains a 4 byte count of entries followed
 125  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 126  * first sg list contains unicast addresses, the second is for multicast.
 127  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 128  * is available.
 129  */
 130 struct virtio_net_ctrl_mac {
 131     uint32_t entries;
 132     uint8_t macs[][ETH_ALEN];
 133 };
 134 #define VIRTIO_NET_CTRL_MAC    1
 135  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 136
 137 /*
 138  * Control VLAN filtering
 139  *
 140  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 141  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
 142  * opposite of add.  Both commands expect an out entry containing a 2
 143  * byte VLAN ID.  VLAN filterting is available with the
 144  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 145  */
 146 #define VIRTIO_NET_CTRL_VLAN       2
 147  #define VIRTIO_NET_CTRL_VLAN_ADD             0
 148  #define VIRTIO_NET_CTRL_VLAN_DEL             1
 149
 150 #endif