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14b50f80 VK |
1 | /* |
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 | ||
24 | enum hvutil_transport_mode { | |
25 | HVUTIL_TRANSPORT_INIT = 0, | |
26 | HVUTIL_TRANSPORT_NETLINK, | |
27 | HVUTIL_TRANSPORT_CHARDEV, | |
28 | }; | |
29 | ||
30 | struct 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 | ||
44 | struct 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)); | |
48 | int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len); | |
49 | void hvutil_transport_destroy(struct hvutil_transport *hvt); | |
50 | ||
51 | #endif /* _HV_UTILS_TRANSPORT_H */ |