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/* 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 */
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