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