/* SPDX-License-Identifier: GPL-2.0-only */ /* * Kernel/userspace transport abstraction for Hyper-V util driver. * * Copyright (C) 2015, Vitaly Kuznetsov <vkuznets@redhat.com> */ #ifndef _HV_UTILS_TRANSPORT_H #define _HV_UTILS_TRANSPORT_H #include <linux/connector.h> #include <linux/miscdevice.h> enum hvutil_transport_mode { HVUTIL_TRANSPORT_INIT = 0, HVUTIL_TRANSPORT_NETLINK, HVUTIL_TRANSPORT_CHARDEV, HVUTIL_TRANSPORT_DESTROY, }; struct hvutil_transport { int mode; /* hvutil_transport_mode */ struct file_operations fops; /* file operations */ struct miscdevice mdev; /* misc device */ struct cb_id cn_id; /* CN_*_IDX/CN_*_VAL */ struct list_head list; /* hvt_list */ int (*on_msg)(void *, int); /* callback on new user message */ void (*on_reset)(void); /* callback when userspace drops */ void (*on_read)(void); /* callback on message read */ u8 *outmsg; /* message to the userspace */ int outmsg_len; /* its length */ wait_queue_head_t outmsg_q; /* poll/read wait queue */ struct mutex lock; /* protects struct members */ struct completion release; /* synchronize with fd release */ }; struct hvutil_transport *hvutil_transport_init(const char *name, u32 cn_idx, u32 cn_val, int (*on_msg)(void *, int), void (*on_reset)(void)); int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len, void (*on_read_cb)(void)); void hvutil_transport_destroy(struct hvutil_transport *hvt); #endif /* _HV_UTILS_TRANSPORT_H */