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