mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 09:25:05 +07:00
fe8dd45bb7
This patch introduces to a new tun/tap specific msg_control:
#define TUN_MSG_UBUF 1
#define TUN_MSG_PTR 2
struct tun_msg_ctl {
int type;
void *ptr;
};
This allows us to pass different kinds of msg_control through
sendmsg(). The first supported type is ubuf (TUN_MSG_UBUF) which will
be used by the existed vhost_net zerocopy code. The second is XDP
buff, which allows vhost_net to pass XDP buff to TUN. This could be
used to implement accepting an array of XDP buffs from vhost_net in
the following patches.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/*
|
|
* Universal TUN/TAP device driver.
|
|
* Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
#ifndef __IF_TUN_H
|
|
#define __IF_TUN_H
|
|
|
|
#include <uapi/linux/if_tun.h>
|
|
#include <uapi/linux/virtio_net.h>
|
|
|
|
#define TUN_XDP_FLAG 0x1UL
|
|
|
|
#define TUN_MSG_UBUF 1
|
|
#define TUN_MSG_PTR 2
|
|
struct tun_msg_ctl {
|
|
unsigned short type;
|
|
unsigned short num;
|
|
void *ptr;
|
|
};
|
|
|
|
struct tun_xdp_hdr {
|
|
int buflen;
|
|
struct virtio_net_hdr gso;
|
|
};
|
|
|
|
#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
|
|
struct socket *tun_get_socket(struct file *);
|
|
struct ptr_ring *tun_get_tx_ring(struct file *file);
|
|
bool tun_is_xdp_frame(void *ptr);
|
|
void *tun_xdp_to_ptr(void *ptr);
|
|
void *tun_ptr_to_xdp(void *ptr);
|
|
void tun_ptr_free(void *ptr);
|
|
#else
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
struct file;
|
|
struct socket;
|
|
static inline struct socket *tun_get_socket(struct file *f)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
static inline bool tun_is_xdp_frame(void *ptr)
|
|
{
|
|
return false;
|
|
}
|
|
static inline void *tun_xdp_to_ptr(void *ptr)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void *tun_ptr_to_xdp(void *ptr)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void tun_ptr_free(void *ptr)
|
|
{
|
|
}
|
|
#endif /* CONFIG_TUN */
|
|
#endif /* __IF_TUN_H */
|