[linux-block.git] / include / linux / if_tap.h

/* 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;
	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_*/
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
635b8c8e SG	2	#ifndef _LINUX_IF_TAP_H_
	3	#define _LINUX_IF_TAP_H_
	4
9a393b5d	5	#if IS_ENABLED(CONFIG_TAP)
635b8c8e	6	struct socket tap_get_socket(struct file );
5990a305	7	struct ptr_ring tap_get_ptr_ring(struct file file);
635b8c8e SG	8	#else
	9	#include <linux/err.h>
	10	#include <linux/errno.h>
	11	struct file;
	12	struct socket;
	13	static inline struct socket tap_get_socket(struct file f)
	14	{
	15	return ERR_PTR(-EINVAL);
	16	}
5990a305	17	static inline struct ptr_ring tap_get_ptr_ring(struct file f)
49f96fd0 JW	18	{
	19	return ERR_PTR(-EINVAL);
	20	}
9a393b5d	21	#endif /* CONFIG_TAP */
635b8c8e	22
6fe3faf8 SG	23	#include <net/sock.h>
	24	#include <linux/skb_array.h>
	25
88ca59d1 GM	26	/*
	27	* Maximum times a tap device can be opened. This can be used to
	28	* configure the number of receive queue, e.g. for multiqueue virtio.
	29	*/
6fe3faf8 SG	30	#define MAX_TAP_QUEUES 256
	31
	32	struct tap_queue;
	33
	34	struct tap_dev {
	35	struct net_device *dev;
	36	u16 flags;
	37	/* This array tracks active taps. */
	38	struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
	39	/* This list tracks all taps (both enabled and disabled) */
	40	struct list_head queue_list;
	41	int numvtaps;
	42	int numqueues;
	43	netdev_features_t tap_features;
	44	int minor;
	45
	46	void (update_features)(struct tap_dev tap, netdev_features_t features);
	47	void (count_tx_dropped)(struct tap_dev tap);
	48	void (count_rx_dropped)(struct tap_dev tap);
	49	};
	50
	51	/*
	52	* A tap queue is the central object of tap module, it connects
	53	* an open character device to virtual interface. There can be
	54	* multiple queues on one interface, which map back to queues
	55	* implemented in hardware on the underlying device.
	56	*
	57	* tap_proto is used to allocate queues through the sock allocation
	58	* mechanism.
	59	*
	60	*/
	61
	62	struct tap_queue {
	63	struct sock sk;
	64	struct socket sock;
6fe3faf8 SG	65	int vnet_hdr_sz;
	66	struct tap_dev __rcu *tap;
	67	struct file *file;
	68	unsigned int flags;
	69	u16 queue_index;
	70	bool enabled;
	71	struct list_head next;
5990a305	72	struct ptr_ring ring;
6fe3faf8 SG	73	};
6fe3faf8 SG	74
635b8c8e	75	rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
6fe3faf8	76	void tap_del_queues(struct tap_dev *tap);
d9f1f61c SG	77	int tap_get_minor(dev_t major, struct tap_dev *tap);
d9f1f61c SG	78	void tap_free_minor(dev_t major, struct tap_dev *tap);
6fe3faf8	79	int tap_queue_resize(struct tap_dev *tap);
dea6e19f GM	80	int tap_create_cdev(struct cdev tap_cdev, dev_t tap_major,
dea6e19f GM	81	const char device_name, struct module module);
ebc05ba7	82	void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
635b8c8e SG	83
635b8c8e SG	84	#endif /_LINUX_IF_TAP_H_/