xref: /f-stack/dpdk/drivers/net/virtio/virtio_user/vhost_kernel_tap.h (revision 4418919f)

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2016 Intel Corporation
 */

#ifndef _VHOST_KERNEL_TAP_H
#define _VHOST_KERNEL_TAP_H

#include <stdbool.h>
#include <sys/ioctl.h>

/* TUN ioctls */
#define TUNSETIFF     _IOW('T', 202, int)
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
#define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
#define TUNGETIFF      _IOR('T', 210, unsigned int)
#define TUNSETSNDBUF   _IOW('T', 212, int)
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
#define TUNSETQUEUE  _IOW('T', 217, int)
#define TUNSETVNETLE _IOW('T', 220, int)
#define TUNSETVNETBE _IOW('T', 222, int)

/* TUNSETIFF ifr flags */
#define IFF_TAP          0x0002
#define IFF_NO_PI        0x1000
#define IFF_ONE_QUEUE    0x2000
#define IFF_VNET_HDR     0x4000
#define IFF_MULTI_QUEUE  0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400

/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
#define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
#define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
#define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
#define TUN_F_UFO	0x10	/* I can handle UFO packets */

/* Constants */
#define PATH_NET_TUN	"/dev/net/tun"

int vhost_kernel_open_tap(char **p_ifname, int hdr_size, int req_mq,
			 const char *mac, uint64_t features);
int vhost_kernel_tap_set_offload(int fd, uint64_t features);
int vhost_kernel_tap_set_queue(int fd, bool attach);

#endif