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