drivers/staging/hv/vmbus_channel_interface.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24 #ifndef __VMBUSCHANNELINTERFACE_H
  25 #define __VMBUSCHANNELINTERFACE_H
  26
  27 /*
  28  * A revision number of vmbus that is used for ensuring both ends on a
  29  * partition are using compatible versions.
  30  */
  31 #define VMBUS_REVISION_NUMBER           13
  32
  33 /* Make maximum size of pipe payload of 16K */
  34 #define MAX_PIPE_DATA_PAYLOAD           (sizeof(u8) * 16384)
  35
  36 /* Define PipeMode values. */
  37 #define VMBUS_PIPE_TYPE_BYTE            0x00000000
  38 #define VMBUS_PIPE_TYPE_MESSAGE         0x00000004
  39
  40 /* The size of the user defined data buffer for non-pipe offers. */
  41 #define MAX_USER_DEFINED_BYTES          120
  42
  43 /* The size of the user defined data buffer for pipe offers. */
  44 #define MAX_PIPE_USER_DEFINED_BYTES     116
  45
  46 /*
  47  * At the center of the Channel Management library is the Channel Offer. This
  48  * struct contains the fundamental information about an offer.
  49  */
  50 struct vmbus_channel_offer {
  51         struct hv_guid if_type;
  52         struct hv_guid if_instance;
  53         u64 int_latency; /* in 100ns units */
  54         u32 if_revision;
  55         u32 server_ctx_size;    /* in bytes */
  56         u16 chn_flags;
  57         u16 mmio_megabytes;             /* in bytes * 1024 * 1024 */
  58
  59         union {
  60                 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
  61                 struct {
  62                         unsigned char user_def[MAX_USER_DEFINED_BYTES];
  63                 } std;
  64
  65                 /*
  66                  * Pipes:
  67                  * The following sructure is an integrated pipe protocol, which
  68                  * is implemented on top of standard user-defined data. Pipe
  69                  * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
  70                  * use.
  71                  */
  72                 struct {
  73                         u32  pipe_mode;
  74                         unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
  75                 } pipe;
  76         } u;
  77         u32 padding;
  78 } __attribute__((packed));
  79
  80 /* Server Flags */
  81 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE        1
  82 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES    2
  83 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS            4
  84 #define VMBUS_CHANNEL_NAMED_PIPE_MODE                   0x10
  85 #define VMBUS_CHANNEL_LOOPBACK_OFFER                    0x100
  86 #define VMBUS_CHANNEL_PARENT_OFFER                      0x200
  87 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION    0x400
  88
  89 #endif