blob: 314c76ce1b07f4d290682b94d108013fb99ce37a [file] [log] [blame]
Vitaly Kuznetsov14b50f82015-04-11 18:07:51 -07001/*
2 * Kernel/userspace transport abstraction for Hyper-V util driver.
3 *
4 * Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more
14 * details.
15 *
16 */
17
18#ifndef _HV_UTILS_TRANSPORT_H
19#define _HV_UTILS_TRANSPORT_H
20
21#include <linux/connector.h>
22#include <linux/miscdevice.h>
23
24enum hvutil_transport_mode {
25 HVUTIL_TRANSPORT_INIT = 0,
26 HVUTIL_TRANSPORT_NETLINK,
27 HVUTIL_TRANSPORT_CHARDEV,
28};
29
30struct hvutil_transport {
31 int mode; /* hvutil_transport_mode */
32 struct file_operations fops; /* file operations */
33 struct miscdevice mdev; /* misc device */
34 struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */
35 struct list_head list; /* hvt_list */
36 int (*on_msg)(void *, int); /* callback on new user message */
37 void (*on_reset)(void); /* callback when userspace drops */
38 u8 *outmsg; /* message to the userspace */
39 int outmsg_len; /* its length */
40 wait_queue_head_t outmsg_q; /* poll/read wait queue */
41 struct mutex outmsg_lock; /* protects outmsg */
42};
43
44struct hvutil_transport *hvutil_transport_init(const char *name,
45 u32 cn_idx, u32 cn_val,
46 int (*on_msg)(void *, int),
47 void (*on_reset)(void));
48int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len);
49void hvutil_transport_destroy(struct hvutil_transport *hvt);
50
51#endif /* _HV_UTILS_TRANSPORT_H */