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 /* from Linux's virtio_net.h */
  22
  23 /* The ID for virtio_net */
  24 #define VIRTIO_ID_NET   1
  25
  26 /* The feature bitmap for virtio net */
  27 #define VIRTIO_NET_F_CSUM       0       /* Host handles pkts w/ partial csum */
  28 #define VIRTIO_NET_F_GUEST_CSUM 1       /* Guest handles pkts w/ partial csum */
  29 #define VIRTIO_NET_F_MAC        5       /* Host has given MAC address. */
  30 #define VIRTIO_NET_F_GSO        6       /* Host handles pkts w/ any GSO type */
  31 #define VIRTIO_NET_F_GUEST_TSO4 7       /* Guest can handle TSOv4 in. */
  32 #define VIRTIO_NET_F_GUEST_TSO6 8       /* Guest can handle TSOv6 in. */
  33 #define VIRTIO_NET_F_GUEST_ECN  9       /* Guest can handle TSO[6] w/ ECN in. */
  34 #define VIRTIO_NET_F_GUEST_UFO  10      /* Guest can handle UFO in. */
  35 #define VIRTIO_NET_F_HOST_TSO4  11      /* Host can handle TSOv4 in. */
  36 #define VIRTIO_NET_F_HOST_TSO6  12      /* Host can handle TSOv6 in. */
  37 #define VIRTIO_NET_F_HOST_ECN   13      /* Host can handle TSO[6] w/ ECN in. */
  38 #define VIRTIO_NET_F_HOST_UFO   14      /* Host can handle UFO in. */
  39 #define VIRTIO_NET_F_MRG_RXBUF  15      /* Host can merge receive buffers. */
  40 #define VIRTIO_NET_F_STATUS     16      /* virtio_net_config.status available */
  41
  42 #define VIRTIO_NET_S_LINK_UP    1       /* Link is up */
  43
  44 #define TX_TIMER_INTERVAL 150000 /* 150 us */
  45
  46 /* Maximum packet size we can receive from tap device: header + 64k */
  47 #define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))
  48
  49 struct virtio_net_config
  50 {
  51     /* The config defining mac address (6 bytes) */
  52     uint8_t mac[6];
  53     /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
  54     uint16_t status;
  55 } __attribute__((packed));
  56
  57 /* This is the first element of the scatter-gather list.  If you don't
  58  * specify GSO or CSUM features, you can simply ignore the header. */
  59 struct virtio_net_hdr
  60 {
  61 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset
  62     uint8_t flags;
  63 #define VIRTIO_NET_HDR_GSO_NONE         0       // Not a GSO frame
  64 #define VIRTIO_NET_HDR_GSO_TCPV4        1       // GSO frame, IPv4 TCP (TSO)
  65 #define VIRTIO_NET_HDR_GSO_UDP          3       // GSO frame, IPv4 UDP (UFO)
  66 #define VIRTIO_NET_HDR_GSO_TCPV6        4       // GSO frame, IPv6 TCP
  67 #define VIRTIO_NET_HDR_GSO_ECN          0x80    // TCP has ECN set
  68     uint8_t gso_type;
  69     uint16_t hdr_len;
  70     uint16_t gso_size;
  71     uint16_t csum_start;
  72     uint16_t csum_offset;
  73 };
  74
  75 /* This is the version of the header to use when the MRG_RXBUF
  76  * feature has been negotiated. */
  77 struct virtio_net_hdr_mrg_rxbuf
  78 {
  79     struct virtio_net_hdr hdr;
  80     uint16_t num_buffers;   /* Number of merged rx buffers */
  81 };
  82
  83 void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn);
  84
  85 #endif