include/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 #include <linux/types.h>
   6 #include <linux/virtio_config.h>
   7 #include <linux/if_ether.h>
   8
   9 /* The ID for virtio_net */
  10 #define VIRTIO_ID_NET   1
  11
  12 /* The feature bitmap for virtio net */
  13 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
  14 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
  15 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
  16 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
  17 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
  18 #define VIRTIO_NET_F_GUEST_TSO6 8       /* Guest can handle TSOv6 in. */
  19 #define VIRTIO_NET_F_GUEST_ECN  9       /* Guest can handle TSO[6] w/ ECN in. */
  20 #define VIRTIO_NET_F_GUEST_UFO  10      /* Guest can handle UFO in. */
  21 #define VIRTIO_NET_F_HOST_TSO4  11      /* Host can handle TSOv4 in. */
  22 #define VIRTIO_NET_F_HOST_TSO6  12      /* Host can handle TSOv6 in. */
  23 #define VIRTIO_NET_F_HOST_ECN   13      /* Host can handle TSO[6] w/ ECN in. */
  24 #define VIRTIO_NET_F_HOST_UFO   14      /* Host can handle UFO in. */
  25 #define VIRTIO_NET_F_MRG_RXBUF  15      /* Host can merge receive buffers. */
  26 #define VIRTIO_NET_F_STATUS     16      /* virtio_net_config.status available */
  27 #define VIRTIO_NET_F_CTRL_VQ    17      /* Control channel available */
  28 #define VIRTIO_NET_F_CTRL_RX    18      /* Control channel RX mode support */
  29 #define VIRTIO_NET_F_CTRL_VLAN  19      /* Control channel VLAN filtering */
  30
  31 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  32
  33 struct virtio_net_config
  34 {
  35         /* The config defining mac address (if VIRTIO_NET_F_MAC) */
  36         __u8 mac[6];
  37         /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  38         __u16 status;
  39 } __attribute__((packed));
  40
  41 /* This is the first element of the scatter-gather list.  If you don't
  42  * specify GSO or CSUM features, you can simply ignore the header. */
  43 struct virtio_net_hdr
  44 {
  45 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset
  46         __u8 flags;
  47 #define VIRTIO_NET_HDR_GSO_NONE         0       // Not a GSO frame
  48 #define VIRTIO_NET_HDR_GSO_TCPV4        1       // GSO frame, IPv4 TCP (TSO)
  49 #define VIRTIO_NET_HDR_GSO_UDP          3       // GSO frame, IPv4 UDP (UFO)
  50 #define VIRTIO_NET_HDR_GSO_TCPV6        4       // GSO frame, IPv6 TCP
  51 #define VIRTIO_NET_HDR_GSO_ECN          0x80    // TCP has ECN set
  52         __u8 gso_type;
  53         __u16 hdr_len;          /* Ethernet + IP + tcp/udp hdrs */
  54         __u16 gso_size;         /* Bytes to append to hdr_len per frame */
  55         __u16 csum_start;       /* Position to start checksumming from */
  56         __u16 csum_offset;      /* Offset after that to place checksum */
  57 };
  58
  59 /* This is the version of the header to use when the MRG_RXBUF
  60  * feature has been negotiated. */
  61 struct virtio_net_hdr_mrg_rxbuf {
  62         struct virtio_net_hdr hdr;
  63         __u16 num_buffers;      /* Number of merged rx buffers */
  64 };
  65
  66 /*
  67  * Control virtqueue data structures
  68  *
  69  * The control virtqueue expects a header in the first sg entry
  70  * and an ack/status response in the last entry.  Data for the
  71  * command goes in between.
  72  */
  73 struct virtio_net_ctrl_hdr {
  74         __u8 class;
  75         __u8 cmd;
  76 } __attribute__((packed));
  77
  78 typedef __u8 virtio_net_ctrl_ack;
  79
  80 #define VIRTIO_NET_OK     0
  81 #define VIRTIO_NET_ERR    1
  82
  83 /*
  84  * Control the RX mode, ie. promisucous and allmulti.  PROMISC and
  85  * ALLMULTI commands require an "out" sg entry containing a 1 byte
  86  * state value, zero = disable, non-zero = enable.  These commands
  87  * are supported with the VIRTIO_NET_F_CTRL_RX feature.
  88  */
  89 #define VIRTIO_NET_CTRL_RX    0
  90  #define VIRTIO_NET_CTRL_RX_PROMISC      0
  91  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
  92
  93 /*
  94  * Control the MAC filter table.
  95  *
  96  * The MAC filter table is managed by the hypervisor, the guest should
  97  * assume the size is infinite.  Filtering should be considered
  98  * non-perfect, ie. based on hypervisor resources, the guest may
  99  * received packets from sources not specified in the filter list.
 100  *
 101  * In addition to the class/cmd header, the TABLE_SET command requires
 102  * two out scatterlists.  Each contains a 4 byte count of entries followed
 103  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 104  * first sg list contains unicast addresses, the second is for multicast.
 105  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 106  * is available.
 107  */
 108 struct virtio_net_ctrl_mac {
 109         __u32 entries;
 110         __u8 macs[][ETH_ALEN];
 111 } __attribute__((packed));
 112
 113 #define VIRTIO_NET_CTRL_MAC    1
 114  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 115
 116 /*
 117  * Control VLAN filtering
 118  *
 119  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 120  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
 121  * opposite of add.  Both commands expect an out entry containing a 2
 122  * byte VLAN ID.  VLAN filterting is available with the
 123  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 124  */
 125 #define VIRTIO_NET_CTRL_VLAN       2
 126  #define VIRTIO_NET_CTRL_VLAN_ADD             0
 127  #define VIRTIO_NET_CTRL_VLAN_DEL             1
 128
 129 #endif /* _LINUX_VIRTIO_NET_H */