12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485 |
- /* 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_*/
|