include/net/tap.h

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  * Copyright (c) 2009 Red Hat, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #ifndef QEMU_NET_TAP_H
  27 #define QEMU_NET_TAP_H
  28
  29 #include "qemu-common.h"
  30 #include "qapi-types.h"
  31
  32 bool tap_has_ufo(NetClientState *nc);
  33 int tap_has_vnet_hdr(NetClientState *nc);
  34 int tap_has_vnet_hdr_len(NetClientState *nc, int len);
  35 void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr);
  36 void tap_set_offload(NetClientState *nc, int csum, int tso4, int tso6, int ecn, int ufo);
  37 void tap_set_vnet_hdr_len(NetClientState *nc, int len);
  38 int tap_enable(NetClientState *nc);
  39 int tap_disable(NetClientState *nc);
  40
  41 int tap_get_fd(NetClientState *nc);
  42
  43 struct vhost_net;
  44 struct vhost_net *tap_get_vhost_net(NetClientState *nc);
  45
  46 struct virtio_net_hdr
  47 {
  48 #define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset
  49 #define VIRTIO_NET_HDR_F_DATA_VALID    2       // Csum is valid
  50     uint8_t flags;
  51 #define VIRTIO_NET_HDR_GSO_NONE         0       // Not a GSO frame
  52 #define VIRTIO_NET_HDR_GSO_TCPV4        1       // GSO frame, IPv4 TCP (TSO)
  53 #define VIRTIO_NET_HDR_GSO_UDP          3       // GSO frame, IPv4 UDP (UFO)
  54 #define VIRTIO_NET_HDR_GSO_TCPV6        4       // GSO frame, IPv6 TCP
  55 #define VIRTIO_NET_HDR_GSO_ECN          0x80    // TCP has ECN set
  56     uint8_t gso_type;
  57     uint16_t hdr_len;
  58     uint16_t gso_size;
  59     uint16_t csum_start;
  60     uint16_t csum_offset;
  61 };
  62
  63 struct virtio_net_hdr_mrg_rxbuf
  64 {
  65     struct virtio_net_hdr hdr;
  66     uint16_t num_buffers;   /* Number of merged rx buffers */
  67 };
  68
  69 #endif /* QEMU_NET_TAP_H */