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84 lines
2.2 KiB
84 lines
2.2 KiB
/* 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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