/* SPDX-License-Identifier: GPL-2.0-only */
|
/*
|
* Kernel/userspace transport abstraction for Hyper-V util driver.
|
*
|
* Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com>
|
*/
|
|
#ifndef _HV_UTILS_TRANSPORT_H
|
#define _HV_UTILS_TRANSPORT_H
|
|
#include <linux/connector.h>
|
#include <linux/miscdevice.h>
|
|
enum hvutil_transport_mode {
|
HVUTIL_TRANSPORT_INIT = 0,
|
HVUTIL_TRANSPORT_NETLINK,
|
HVUTIL_TRANSPORT_CHARDEV,
|
HVUTIL_TRANSPORT_DESTROY,
|
};
|
|
struct hvutil_transport {
|
int mode; /* hvutil_transport_mode */
|
struct file_operations fops; /* file operations */
|
struct miscdevice mdev; /* misc device */
|
struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */
|
struct list_head list; /* hvt_list */
|
int (*on_msg)(void *, int); /* callback on new user message */
|
void (*on_reset)(void); /* callback when userspace drops */
|
void (*on_read)(void); /* callback on message read */
|
u8 *outmsg; /* message to the userspace */
|
int outmsg_len; /* its length */
|
wait_queue_head_t outmsg_q; /* poll/read wait queue */
|
struct mutex lock; /* protects struct members */
|
struct completion release; /* synchronize with fd release */
|
};
|
|
struct hvutil_transport *hvutil_transport_init(const char *name,
|
u32 cn_idx, u32 cn_val,
|
int (*on_msg)(void *, int),
|
void (*on_reset)(void));
|
int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
|
void (*on_read_cb)(void));
|
void hvutil_transport_destroy(struct hvutil_transport *hvt);
|
|
#endif /* _HV_UTILS_TRANSPORT_H */
|
