LXR linux/drivers/hv/hv_utils

   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
  24enum hvutil_transport_mode {
  25        HVUTIL_TRANSPORT_INIT = 0,
  26        HVUTIL_TRANSPORT_NETLINK,
  27        HVUTIL_TRANSPORT_CHARDEV,
  28        HVUTIL_TRANSPORT_DESTROY,
  29};
  30
  31struct hvutil_transport {
  32        int mode;                           /* hvutil_transport_mode */
  33        struct file_operations fops;        /* file operations */
  34        struct miscdevice mdev;             /* misc device */
  35        struct cb_id cn_id;                 /* CN_*_IDX/CN_*_VAL */
  36        struct list_head list;              /* hvt_list */
  37        int (*on_msg)(void *, int);         /* callback on new user message */
  38        void (*on_reset)(void);             /* callback when userspace drops */
  39        u8 *outmsg;                         /* message to the userspace */
  40        int outmsg_len;                     /* its length */
  41        wait_queue_head_t outmsg_q;         /* poll/read wait queue */
  42        struct mutex lock;                  /* protects struct members */
  43};
  44
  45struct hvutil_transport *hvutil_transport_init(const char *name,
  46                                               u32 cn_idx, u32 cn_val,
  47                                               int (*on_msg)(void *, int),
  48                                               void (*on_reset)(void));
  49int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len);
  50void hvutil_transport_destroy(struct hvutil_transport *hvt);
  51
  52#endif /* _HV_UTILS_TRANSPORT_H */
  53