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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Kernel/userspace transport abstraction for Hyper-V util driver.4 *5 * Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com>6 */7 8#ifndef _HV_UTILS_TRANSPORT_H9#define _HV_UTILS_TRANSPORT_H10 11#include <linux/connector.h>12#include <linux/miscdevice.h>13 14enum hvutil_transport_mode {15 HVUTIL_TRANSPORT_INIT = 0,16 HVUTIL_TRANSPORT_NETLINK,17 HVUTIL_TRANSPORT_CHARDEV,18 HVUTIL_TRANSPORT_DESTROY,19};20 21struct hvutil_transport {22 int mode; /* hvutil_transport_mode */23 struct file_operations fops; /* file operations */24 struct miscdevice mdev; /* misc device */25 struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */26 struct list_head list; /* hvt_list */27 int (*on_msg)(void *, int); /* callback on new user message */28 void (*on_reset)(void); /* callback when userspace drops */29 void (*on_read)(void); /* callback on message read */30 u8 *outmsg; /* message to the userspace */31 int outmsg_len; /* its length */32 wait_queue_head_t outmsg_q; /* poll/read wait queue */33 struct mutex lock; /* protects struct members */34 struct completion release; /* synchronize with fd release */35};36 37struct hvutil_transport *hvutil_transport_init(const char *name,38 u32 cn_idx, u32 cn_val,39 int (*on_msg)(void *, int),40 void (*on_reset)(void));41int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,42 void (*on_read_cb)(void));43void hvutil_transport_destroy(struct hvutil_transport *hvt);44 45#endif /* _HV_UTILS_TRANSPORT_H */46