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  *
   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 <linux/types.h>
  29 #include <linux/virtio_ids.h>
  30 #include <linux/virtio_config.h>
  31 #include <linux/if_ether.h>
  32
  33 /* The feature bitmap for virtio net */
  34 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
  35 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
  36 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
  37 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
  38 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
  39 #define VIRTIO_NET_F_GUEST_TSO6 8       /* Guest can handle TSOv6 in. */
  40 #define VIRTIO_NET_F_GUEST_ECN  9       /* Guest can handle TSO[6] w/ ECN in. */
  41 #define VIRTIO_NET_F_GUEST_UFO  10      /* Guest can handle UFO in. */
  42 #define VIRTIO_NET_F_HOST_TSO4  11      /* Host can handle TSOv4 in. */
  43 #define VIRTIO_NET_F_HOST_TSO6  12      /* Host can handle TSOv6 in. */
  44 #define VIRTIO_NET_F_HOST_ECN   13      /* Host can handle TSO[6] w/ ECN in. */
  45 #define VIRTIO_NET_F_HOST_UFO   14      /* Host can handle UFO in. */
  46 #define VIRTIO_NET_F_MRG_RXBUF  15      /* Host can merge receive buffers. */
  47 #define VIRTIO_NET_F_STATUS     16      /* virtio_net_config.status available */
  48 #define VIRTIO_NET_F_CTRL_VQ    17      /* Control channel available */
  49 #define VIRTIO_NET_F_CTRL_RX    18      /* Control channel RX mode support */
  50 #define VIRTIO_NET_F_CTRL_VLAN  19      /* Control channel VLAN filtering */
  51 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20   /* Extra RX mode control support */
  52
  53 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  54
  55 struct virtio_net_config {
  56         /* The config defining mac address (if VIRTIO_NET_F_MAC) */
  57         __u8 mac[6];
  58         /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  59         __u16 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 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset
  66 #define VIRTIO_NET_HDR_F_DATA_VALID     2       // Csum is valid
  67         __u8 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         __u8 gso_type;
  74         __u16 hdr_len;          /* Ethernet + IP + tcp/udp hdrs */
  75         __u16 gso_size;         /* Bytes to append to hdr_len per frame */
  76         __u16 csum_start;       /* Position to start checksumming from */
  77         __u16 csum_offset;      /* Offset after that to place checksum */
  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         struct virtio_net_hdr hdr;
  84         __u16 num_buffers;      /* Number of merged rx buffers */
  85 };
  86
  87 /*
  88  * Control virtqueue data structures
  89  *
  90  * The control virtqueue expects a header in the first sg entry
  91  * and an ack/status response in the last entry.  Data for the
  92  * command goes in between.
  93  */
  94 struct virtio_net_ctrl_hdr {
  95         __u8 class;
  96         __u8 cmd;
  97 } __attribute__((packed));
  98
  99 typedef __u8 virtio_net_ctrl_ack;
 100
 101 #define VIRTIO_NET_OK     0
 102 #define VIRTIO_NET_ERR    1
 103
 104 /*
 105  * Control the RX mode, ie. promisucous, allmulti, etc...
 106  * All commands require an "out" sg entry containing a 1 byte
 107  * state value, zero = disable, non-zero = enable.  Commands
 108  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
 109  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
 110  */
 111 #define VIRTIO_NET_CTRL_RX    0
 112  #define VIRTIO_NET_CTRL_RX_PROMISC      0
 113  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
 114  #define VIRTIO_NET_CTRL_RX_ALLUNI       2
 115  #define VIRTIO_NET_CTRL_RX_NOMULTI      3
 116  #define VIRTIO_NET_CTRL_RX_NOUNI        4
 117  #define VIRTIO_NET_CTRL_RX_NOBCAST      5
 118
 119 /*
 120  * Control the MAC filter table.
 121  *
 122  * The MAC filter table is managed by the hypervisor, the guest should
 123  * assume the size is infinite.  Filtering should be considered
 124  * non-perfect, ie. based on hypervisor resources, the guest may
 125  * received packets from sources not specified in the filter list.
 126  *
 127  * In addition to the class/cmd header, the TABLE_SET command requires
 128  * two out scatterlists.  Each contains a 4 byte count of entries followed
 129  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
 130  * first sg list contains unicast addresses, the second is for multicast.
 131  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
 132  * is available.
 133  */
 134 struct virtio_net_ctrl_mac {
 135         __u32 entries;
 136         __u8 macs[][ETH_ALEN];
 137 } __attribute__((packed));
 138
 139 #define VIRTIO_NET_CTRL_MAC    1
 140  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
 141
 142 /*
 143  * Control VLAN filtering
 144  *
 145  * The VLAN filter table is controlled via a simple ADD/DEL interface.
 146  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
 147  * opposite of add.  Both commands expect an out entry containing a 2
 148  * byte VLAN ID.  VLAN filterting is available with the
 149  * VIRTIO_NET_F_CTRL_VLAN feature bit.
 150  */
 151 #define VIRTIO_NET_CTRL_VLAN       2
 152  #define VIRTIO_NET_CTRL_VLAN_ADD             0
 153  #define VIRTIO_NET_CTRL_VLAN_DEL             1
 154
 155 #endif /* _LINUX_VIRTIO_NET_H */