86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_IF_TAP_H_
|
|
#define _LINUX_IF_TAP_H_
|
|
|
|
#if IS_ENABLED(CONFIG_TAP)
|
|
struct socket *tap_get_socket(struct file *);
|
|
struct ptr_ring *tap_get_ptr_ring(struct file *file);
|
|
#else
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
struct file;
|
|
struct socket;
|
|
static inline struct socket *tap_get_socket(struct file *f)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
static inline struct ptr_ring *tap_get_ptr_ring(struct file *f)
|
|
{
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
#endif /* CONFIG_TAP */
|
|
|
|
#include <net/sock.h>
|
|
#include <linux/skb_array.h>
|
|
|
|
/*
|
|
* Maximum times a tap device can be opened. This can be used to
|
|
* configure the number of receive queue, e.g. for multiqueue virtio.
|
|
*/
|
|
#define MAX_TAP_QUEUES 256
|
|
|
|
struct tap_queue;
|
|
|
|
struct tap_dev {
|
|
struct net_device *dev;
|
|
u16 flags;
|
|
/* This array tracks active taps. */
|
|
struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
|
|
/* This list tracks all taps (both enabled and disabled) */
|
|
struct list_head queue_list;
|
|
int numvtaps;
|
|
int numqueues;
|
|
netdev_features_t tap_features;
|
|
int minor;
|
|
|
|
void (*update_features)(struct tap_dev *tap, netdev_features_t features);
|
|
void (*count_tx_dropped)(struct tap_dev *tap);
|
|
void (*count_rx_dropped)(struct tap_dev *tap);
|
|
};
|
|
|
|
/*
|
|
* A tap queue is the central object of tap module, it connects
|
|
* an open character device to virtual interface. There can be
|
|
* multiple queues on one interface, which map back to queues
|
|
* implemented in hardware on the underlying device.
|
|
*
|
|
* tap_proto is used to allocate queues through the sock allocation
|
|
* mechanism.
|
|
*
|
|
*/
|
|
|
|
struct tap_queue {
|
|
struct sock sk;
|
|
struct socket sock;
|
|
struct socket_wq wq;
|
|
int vnet_hdr_sz;
|
|
struct tap_dev __rcu *tap;
|
|
struct file *file;
|
|
unsigned int flags;
|
|
u16 queue_index;
|
|
bool enabled;
|
|
struct list_head next;
|
|
struct ptr_ring ring;
|
|
};
|
|
|
|
rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
|
|
void tap_del_queues(struct tap_dev *tap);
|
|
int tap_get_minor(dev_t major, struct tap_dev *tap);
|
|
void tap_free_minor(dev_t major, struct tap_dev *tap);
|
|
int tap_queue_resize(struct tap_dev *tap);
|
|
int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major,
|
|
const char *device_name, struct module *module);
|
|
void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
|
|
|
|
#endif /*_LINUX_IF_TAP_H_*/
|