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 */ 70