[linux-2.6-block.git] / include / linux / if_tap.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_IF_TAP_H_
#define _LINUX_IF_TAP_H_

#include <net/sock.h>
#include <linux/skb_array.h>

struct file;
struct socket;

#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>
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 */

/*
 * 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
5f10376b JK	5	#include <net/sock.h>
	6	#include <linux/skb_array.h>
	7
	8	struct file;
	9	struct socket;
	10
9a393b5d	11	#if IS_ENABLED(CONFIG_TAP)
635b8c8e	12	struct socket tap_get_socket(struct file );
5990a305	13	struct ptr_ring tap_get_ptr_ring(struct file file);
635b8c8e SG	14	#else
	15	#include <linux/err.h>
	16	#include <linux/errno.h>
635b8c8e SG	17	static inline struct socket tap_get_socket(struct file f)
	18	{
	19	return ERR_PTR(-EINVAL);
	20	}
5990a305	21	static inline struct ptr_ring tap_get_ptr_ring(struct file f)
49f96fd0 JW	22	{
	23	return ERR_PTR(-EINVAL);
	24	}
9a393b5d	25	#endif /* CONFIG_TAP */
635b8c8e	26
88ca59d1 GM	27	/*
	28	* Maximum times a tap device can be opened. This can be used to
	29	* configure the number of receive queue, e.g. for multiqueue virtio.
	30	*/
6fe3faf8 SG	31	#define MAX_TAP_QUEUES 256
	32
	33	struct tap_queue;
	34
	35	struct tap_dev {
	36	struct net_device *dev;
	37	u16 flags;
	38	/* This array tracks active taps. */
	39	struct tap_queue __rcu *taps[MAX_TAP_QUEUES];
	40	/* This list tracks all taps (both enabled and disabled) */
	41	struct list_head queue_list;
	42	int numvtaps;
	43	int numqueues;
	44	netdev_features_t tap_features;
	45	int minor;
	46
	47	void (update_features)(struct tap_dev tap, netdev_features_t features);
	48	void (count_tx_dropped)(struct tap_dev tap);
	49	void (count_rx_dropped)(struct tap_dev tap);
	50	};
	51
	52	/*
	53	* A tap queue is the central object of tap module, it connects
	54	* an open character device to virtual interface. There can be
	55	* multiple queues on one interface, which map back to queues
	56	* implemented in hardware on the underlying device.
	57	*
	58	* tap_proto is used to allocate queues through the sock allocation
	59	* mechanism.
	60	*
	61	*/
	62
	63	struct tap_queue {
	64	struct sock sk;
	65	struct socket sock;
6fe3faf8 SG	66	int vnet_hdr_sz;
	67	struct tap_dev __rcu *tap;
	68	struct file *file;
	69	unsigned int flags;
	70	u16 queue_index;
	71	bool enabled;
	72	struct list_head next;
5990a305	73	struct ptr_ring ring;
6fe3faf8 SG	74	};
6fe3faf8 SG	75
635b8c8e	76	rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
6fe3faf8	77	void tap_del_queues(struct tap_dev *tap);
d9f1f61c SG	78	int tap_get_minor(dev_t major, struct tap_dev *tap);
d9f1f61c SG	79	void tap_free_minor(dev_t major, struct tap_dev *tap);
6fe3faf8	80	int tap_queue_resize(struct tap_dev *tap);
dea6e19f GM	81	int tap_create_cdev(struct cdev tap_cdev, dev_t tap_major,
dea6e19f GM	82	const char device_name, struct module module);
ebc05ba7	83	void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev);
635b8c8e SG	84
635b8c8e SG	85	#endif /_LINUX_IF_TAP_H_/