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_H |
9 | #define _HV_UTILS_TRANSPORT_H |
10 | |
11 | #include <linux/connector.h> |
12 | #include <linux/miscdevice.h> |
13 | |
14 | enum hvutil_transport_mode { |
15 | HVUTIL_TRANSPORT_INIT = 0, |
16 | HVUTIL_TRANSPORT_NETLINK, |
17 | HVUTIL_TRANSPORT_CHARDEV, |
18 | HVUTIL_TRANSPORT_DESTROY, |
19 | }; |
20 | |
21 | struct 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 | |
37 | struct 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)); |
41 | int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len, |
42 | void (*on_read_cb)(void)); |
43 | void hvutil_transport_destroy(struct hvutil_transport *hvt); |
44 | |
45 | #endif /* _HV_UTILS_TRANSPORT_H */ |
46 | |