drivers/misc/vmw_vmci/vmci_datagram.h

   1 /*
   2  * VMware VMCI Driver
   3  *
   4  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   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 as published by the
   8  * Free Software Foundation version 2 and no later version.
   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 MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #ifndef _VMCI_DATAGRAM_H_
  17 #define _VMCI_DATAGRAM_H_
  18
  19 #include <linux/types.h>
  20 #include <linux/list.h>
  21
  22 #include "vmci_context.h"
  23
  24 #define VMCI_MAX_DELAYED_DG_HOST_QUEUE_SIZE 256
  25
  26 /*
  27  * The struct vmci_datagram_queue_entry is a queue header for the in-kernel VMCI
  28  * datagram queues. It is allocated in non-paged memory, as the
  29  * content is accessed while holding a spinlock. The pending datagram
  30  * itself may be allocated from paged memory. We shadow the size of
  31  * the datagram in the non-paged queue entry as this size is used
  32  * while holding the same spinlock as above.
  33  */
  34 struct vmci_datagram_queue_entry {
  35         struct list_head list_item;     /* For queuing. */
  36         size_t dg_size;         /* Size of datagram. */
  37         struct vmci_datagram *dg;       /* Pending datagram. */
  38 };
  39
  40 /* VMCIDatagramSendRecvInfo */
  41 struct vmci_datagram_snd_rcv_info {
  42         u64 addr;
  43         u32 len;
  44         s32 result;
  45 };
  46
  47 /* Datagram API for non-public use. */
  48 int vmci_datagram_dispatch(u32 context_id, struct vmci_datagram *dg,
  49                            bool from_guest);
  50 int vmci_datagram_invoke_guest_handler(struct vmci_datagram *dg);
  51
  52 #endif /* _VMCI_DATAGRAM_H_ */