summaryrefslogtreecommitdiff
path: root/drivers/staging/hv/netvsc.h
blob: a6264db8388a790254d27e0d87e7a6652b6146bc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
/*
 *
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 *
 */


#ifndef _NETVSC_H_
#define _NETVSC_H_

#include <linux/list.h>
#include "VmbusPacketFormat.h"
#include "VmbusChannelInterface.h"
#include "NetVscApi.h"


#define NVSP_INVALID_PROTOCOL_VERSION	((u32)0xFFFFFFFF)

#define NVSP_PROTOCOL_VERSION_1		2
#define NVSP_MIN_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1
#define NVSP_MAX_PROTOCOL_VERSION	NVSP_PROTOCOL_VERSION_1

enum {
	NvspMessageTypeNone = 0,

	/* Init Messages */
	NvspMessageTypeInit			= 1,
	NvspMessageTypeInitComplete		= 2,

	NvspVersionMessageStart			= 100,

	/* Version 1 Messages */
	NvspMessage1TypeSendNdisVersion		= NvspVersionMessageStart,

	NvspMessage1TypeSendReceiveBuffer,
	NvspMessage1TypeSendReceiveBufferComplete,
	NvspMessage1TypeRevokeReceiveBuffer,

	NvspMessage1TypeSendSendBuffer,
	NvspMessage1TypeSendSendBufferComplete,
	NvspMessage1TypeRevokeSendBuffer,

	NvspMessage1TypeSendRNDISPacket,
	NvspMessage1TypeSendRNDISPacketComplete,

	/*
	 * This should be set to the number of messages for the version with
	 * the maximum number of messages.
	 */
	NvspNumMessagePerVersion		= 9,
};

enum {
	NvspStatusNone = 0,
	NvspStatusSuccess,
	NvspStatusFailure,
	NvspStatusProtocolVersionRangeTooNew,
	NvspStatusProtocolVersionRangeTooOld,
	NvspStatusInvalidRndisPacket,
	NvspStatusBusy,
	NvspStatusMax,
};

struct nvsp_message_header {
	u32 MessageType;
};

/* Init Messages */

/*
 * This message is used by the VSC to initialize the channel after the channels
 * has been opened. This message should never include anything other then
 * versioning (i.e. this message will be the same for ever).
 */
struct nvsp_message_init {
	u32 MinProtocolVersion;
	u32 MaxProtocolVersion;
} __attribute__((packed));

/*
 * This message is used by the VSP to complete the initialization of the
 * channel. This message should never include anything other then versioning
 * (i.e. this message will be the same for ever).
 */
struct nvsp_message_init_complete {
	u32 NegotiatedProtocolVersion;
	u32 MaximumMdlChainLength;
	u32 Status;
} __attribute__((packed));

union nvsp_message_init_uber {
	struct nvsp_message_init Init;
	struct nvsp_message_init_complete InitComplete;
} __attribute__((packed));

/* Version 1 Messages */

/*
 * This message is used by the VSC to send the NDIS version to the VSP. The VSP
 * can use this information when handling OIDs sent by the VSC.
 */
struct nvsp_1_message_send_ndis_version {
	u32 NdisMajorVersion;
	u32 NdisMinorVersion;
} __attribute__((packed));

/*
 * This message is used by the VSC to send a receive buffer to the VSP. The VSP
 * can then use the receive buffer to send data to the VSC.
 */
struct nvsp_1_message_send_receive_buffer {
	u32 GpadlHandle;
	u16 Id;
} __attribute__((packed));

struct nvsp_1_receive_buffer_section {
	u32 Offset;
	u32 SubAllocationSize;
	u32 NumSubAllocations;
	u32 EndOffset;
} __attribute__((packed));

/*
 * This message is used by the VSP to acknowledge a receive buffer send by the
 * VSC. This message must be sent by the VSP before the VSP uses the receive
 * buffer.
 */
struct nvsp_1_message_send_receive_buffer_complete {
	u32 Status;
	u32 NumSections;

	/*
	 * The receive buffer is split into two parts, a large suballocation
	 * section and a small suballocation section. These sections are then
	 * suballocated by a certain size.
	 */

	/*
	 * For example, the following break up of the receive buffer has 6
	 * large suballocations and 10 small suballocations.
	 */

	/*
	 * |            Large Section          |  |   Small Section   |
	 * ------------------------------------------------------------
	 * |     |     |     |     |     |     |  | | | | | | | | | | |
	 * |                                      |
	 *  LargeOffset                            SmallOffset
	 */

	struct nvsp_1_receive_buffer_section Sections[1];
} __attribute__((packed));

/*
 * This message is sent by the VSC to revoke the receive buffer.  After the VSP
 * completes this transaction, the vsp should never use the receive buffer
 * again.
 */
struct nvsp_1_message_revoke_receive_buffer {
	u16 Id;
};

/*
 * This message is used by the VSC to send a send buffer to the VSP. The VSC
 * can then use the send buffer to send data to the VSP.
 */
struct nvsp_1_message_send_send_buffer {
	u32 GpadlHandle;
	u16 Id;
} __attribute__((packed));

/*
 * This message is used by the VSP to acknowledge a send buffer sent by the
 * VSC. This message must be sent by the VSP before the VSP uses the sent
 * buffer.
 */
struct nvsp_1_message_send_send_buffer_complete {
	u32 Status;

	/*
	 * The VSC gets to choose the size of the send buffer and the VSP gets
	 * to choose the sections size of the buffer.  This was done to enable
	 * dynamic reconfigurations when the cost of GPA-direct buffers
	 * decreases.
	 */
	u32 SectionSize;
} __attribute__((packed));

/*
 * This message is sent by the VSC to revoke the send buffer.  After the VSP
 * completes this transaction, the vsp should never use the send buffer again.
 */
struct nvsp_1_message_revoke_send_buffer {
	u16 Id;
};

/*
 * This message is used by both the VSP and the VSC to send a RNDIS message to
 * the opposite channel endpoint.
 */
struct nvsp_1_message_send_rndis_packet {
	/*
	 * This field is specified by RNIDS. They assume there's two different
	 * channels of communication. However, the Network VSP only has one.
	 * Therefore, the channel travels with the RNDIS packet.
	 */
	u32 ChannelType;

	/*
	 * This field is used to send part or all of the data through a send
	 * buffer. This values specifies an index into the send buffer. If the
	 * index is 0xFFFFFFFF, then the send buffer is not being used and all
	 * of the data was sent through other VMBus mechanisms.
	 */
	u32 SendBufferSectionIndex;
	u32 SendBufferSectionSize;
} __attribute__((packed));

/*
 * This message is used by both the VSP and the VSC to complete a RNDIS message
 * to the opposite channel endpoint. At this point, the initiator of this
 * message cannot use any resources associated with the original RNDIS packet.
 */
struct nvsp_1_message_send_rndis_packet_complete {
	u32 Status;
};

union nvsp_1_message_uber {
	struct nvsp_1_message_send_ndis_version SendNdisVersion;

	struct nvsp_1_message_send_receive_buffer SendReceiveBuffer;
	struct nvsp_1_message_send_receive_buffer_complete
						SendReceiveBufferComplete;
	struct nvsp_1_message_revoke_receive_buffer RevokeReceiveBuffer;

	struct nvsp_1_message_send_send_buffer SendSendBuffer;
	struct nvsp_1_message_send_send_buffer_complete SendSendBufferComplete;
	struct nvsp_1_message_revoke_send_buffer RevokeSendBuffer;

	struct nvsp_1_message_send_rndis_packet SendRNDISPacket;
	struct nvsp_1_message_send_rndis_packet_complete
						SendRNDISPacketComplete;
} __attribute__((packed));

union nvsp_all_messages {
	union nvsp_message_init_uber InitMessages;
	union nvsp_1_message_uber Version1Messages;
} __attribute__((packed));

/* ALL Messages */
struct nvsp_message {
	struct nvsp_message_header Header;
	union nvsp_all_messages Messages;
} __attribute__((packed));




/* #define NVSC_MIN_PROTOCOL_VERSION		1 */
/* #define NVSC_MAX_PROTOCOL_VERSION		1 */

#define NETVSC_SEND_BUFFER_SIZE			(64*1024)	/* 64K */
#define NETVSC_SEND_BUFFER_ID			0xface


#define NETVSC_RECEIVE_BUFFER_SIZE		(1024*1024)	/* 1MB */

#define NETVSC_RECEIVE_BUFFER_ID		0xcafe

#define NETVSC_RECEIVE_SG_COUNT			1

/* Preallocated receive packets */
#define NETVSC_RECEIVE_PACKETLIST_COUNT		256

#define NETVSC_PACKET_SIZE                      2048

/* Per netvsc channel-specific */
struct netvsc_device {
	struct hv_device *Device;

	atomic_t RefCount;
	atomic_t NumOutstandingSends;
	/*
	 * List of free preallocated hv_netvsc_packet to represent receive
	 * packet
	 */
	struct list_head ReceivePacketList;
	spinlock_t receive_packet_list_lock;

	/* Send buffer allocated by us but manages by NetVSP */
	void *SendBuffer;
	u32 SendBufferSize;
	u32 SendBufferGpadlHandle;
	u32 SendSectionSize;

	/* Receive buffer allocated by us but manages by NetVSP */
	void *ReceiveBuffer;
	u32 ReceiveBufferSize;
	u32 ReceiveBufferGpadlHandle;
	u32 ReceiveSectionCount;
	struct nvsp_1_receive_buffer_section *ReceiveSections;

	/* Used for NetVSP initialization protocol */
	struct osd_waitevent *ChannelInitEvent;
	struct nvsp_message ChannelInitPacket;

	struct nvsp_message RevokePacket;
	/* unsigned char HwMacAddr[HW_MACADDR_LEN]; */

	/* Holds rndis device info */
	void *Extension;
};

#endif /* _NETVSC_H_ */