aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/core/ud_header.c
blob: 650b501eb142718fb322019a9357e2186c02a71c (plain) (blame)
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
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/*
 * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/string.h>

#include <rdma/ib_pack.h>

#define STRUCT_FIELD(header, field) \
	.struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field),      \
	.struct_size_bytes   = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \
	.field_name          = #header ":" #field

static const struct ib_field lrh_table[]  = {
	{ STRUCT_FIELD(lrh, virtual_lane),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(lrh, link_version),
	  .offset_words = 0,
	  .offset_bits  = 4,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(lrh, service_level),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 4 },
	{ RESERVED,
	  .offset_words = 0,
	  .offset_bits  = 12,
	  .size_bits    = 2 },
	{ STRUCT_FIELD(lrh, link_next_header),
	  .offset_words = 0,
	  .offset_bits  = 14,
	  .size_bits    = 2 },
	{ STRUCT_FIELD(lrh, destination_lid),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ RESERVED,
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 5 },
	{ STRUCT_FIELD(lrh, packet_length),
	  .offset_words = 1,
	  .offset_bits  = 5,
	  .size_bits    = 11 },
	{ STRUCT_FIELD(lrh, source_lid),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 16 }
};

static const struct ib_field grh_table[]  = {
	{ STRUCT_FIELD(grh, ip_version),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(grh, traffic_class),
	  .offset_words = 0,
	  .offset_bits  = 4,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(grh, flow_label),
	  .offset_words = 0,
	  .offset_bits  = 12,
	  .size_bits    = 20 },
	{ STRUCT_FIELD(grh, payload_length),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ STRUCT_FIELD(grh, next_header),
	  .offset_words = 1,
	  .offset_bits  = 16,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(grh, hop_limit),
	  .offset_words = 1,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(grh, source_gid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ STRUCT_FIELD(grh, destination_gid),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 128 }
};

static const struct ib_field bth_table[]  = {
	{ STRUCT_FIELD(bth, opcode),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(bth, solicited_event),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 1 },
	{ STRUCT_FIELD(bth, mig_req),
	  .offset_words = 0,
	  .offset_bits  = 9,
	  .size_bits    = 1 },
	{ STRUCT_FIELD(bth, pad_count),
	  .offset_words = 0,
	  .offset_bits  = 10,
	  .size_bits    = 2 },
	{ STRUCT_FIELD(bth, transport_header_version),
	  .offset_words = 0,
	  .offset_bits  = 12,
	  .size_bits    = 4 },
	{ STRUCT_FIELD(bth, pkey),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ RESERVED,
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(bth, destination_qpn),
	  .offset_words = 1,
	  .offset_bits  = 8,
	  .size_bits    = 24 },
	{ STRUCT_FIELD(bth, ack_req),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 1 },
	{ RESERVED,
	  .offset_words = 2,
	  .offset_bits  = 1,
	  .size_bits    = 7 },
	{ STRUCT_FIELD(bth, psn),
	  .offset_words = 2,
	  .offset_bits  = 8,
	  .size_bits    = 24 }
};

static const struct ib_field deth_table[] = {
	{ STRUCT_FIELD(deth, qkey),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ RESERVED,
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ STRUCT_FIELD(deth, source_qpn),
	  .offset_words = 1,
	  .offset_bits  = 8,
	  .size_bits    = 24 }
};

/**
 * ib_ud_header_init - Initialize UD header structure
 * @payload_bytes:Length of packet payload
 * @grh_present:GRH flag (if non-zero, GRH will be included)
 * @immediate_present: specify if immediate data should be used
 * @header:Structure to initialize
 *
 * ib_ud_header_init() initializes the lrh.link_version, lrh.link_next_header,
 * lrh.packet_length, grh.ip_version, grh.payload_length,
 * grh.next_header, bth.opcode, bth.pad_count and
 * bth.transport_header_version fields of a &struct ib_ud_header given
 * the payload length and whether a GRH will be included.
 */
void ib_ud_header_init(int     		    payload_bytes,
		       int    		    grh_present,
		       int		    immediate_present,
		       struct ib_ud_header *header)
{
	u16 packet_length;

	memset(header, 0, sizeof *header);

	header->lrh.link_version     = 0;
	header->lrh.link_next_header =
		grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
	packet_length		     = (IB_LRH_BYTES     +
					IB_BTH_BYTES     +
					IB_DETH_BYTES    +
					payload_bytes    +
					4                + /* ICRC     */
					3) / 4;            /* round up */

	header->grh_present          = grh_present;
	if (grh_present) {
		packet_length		   += IB_GRH_BYTES / 4;
		header->grh.ip_version      = 6;
		header->grh.payload_length  =
			cpu_to_be16((IB_BTH_BYTES     +
				     IB_DETH_BYTES    +
				     payload_bytes    +
				     4                + /* ICRC     */
				     3) & ~3);          /* round up */
		header->grh.next_header     = 0x1b;
	}

	header->lrh.packet_length = cpu_to_be16(packet_length);

	header->immediate_present	     = immediate_present;
	if (immediate_present)
		header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
	else
		header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY;
	header->bth.pad_count                = (4 - payload_bytes) & 3;
	header->bth.transport_header_version = 0;
}
EXPORT_SYMBOL(ib_ud_header_init);

/**
 * ib_ud_header_pack - Pack UD header struct into wire format
 * @header:UD header struct
 * @buf:Buffer to pack into
 *
 * ib_ud_header_pack() packs the UD header structure @header into wire
 * format in the buffer @buf.
 */
int ib_ud_header_pack(struct ib_ud_header *header,
		      void                *buf)
{
	int len = 0;

	ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
		&header->lrh, buf);
	len += IB_LRH_BYTES;

	if (header->grh_present) {
		ib_pack(grh_table, ARRAY_SIZE(grh_table),
			&header->grh, buf + len);
		len += IB_GRH_BYTES;
	}

	ib_pack(bth_table, ARRAY_SIZE(bth_table),
		&header->bth, buf + len);
	len += IB_BTH_BYTES;

	ib_pack(deth_table, ARRAY_SIZE(deth_table),
		&header->deth, buf + len);
	len += IB_DETH_BYTES;

	if (header->immediate_present) {
		memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
		len += sizeof header->immediate_data;
	}

	return len;
}
EXPORT_SYMBOL(ib_ud_header_pack);

/**
 * ib_ud_header_unpack - Unpack UD header struct from wire format
 * @header:UD header struct
 * @buf:Buffer to pack into
 *
 * ib_ud_header_pack() unpacks the UD header structure @header from wire
 * format in the buffer @buf.
 */
int ib_ud_header_unpack(void                *buf,
			struct ib_ud_header *header)
{
	ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
		  buf, &header->lrh);
	buf += IB_LRH_BYTES;

	if (header->lrh.link_version != 0) {
		printk(KERN_WARNING "Invalid LRH.link_version %d\n",
		       header->lrh.link_version);
		return -EINVAL;
	}

	switch (header->lrh.link_next_header) {
	case IB_LNH_IBA_LOCAL:
		header->grh_present = 0;
		break;

	case IB_LNH_IBA_GLOBAL:
		header->grh_present = 1;
		ib_unpack(grh_table, ARRAY_SIZE(grh_table),
			  buf, &header->grh);
		buf += IB_GRH_BYTES;

		if (header->grh.ip_version != 6) {
			printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
			       header->grh.ip_version);
			return -EINVAL;
		}
		if (header->grh.next_header != 0x1b) {
			printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
			       header->grh.next_header);
			return -EINVAL;
		}
		break;

	default:
		printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
		       header->lrh.link_next_header);
		return -EINVAL;
	}

	ib_unpack(bth_table, ARRAY_SIZE(bth_table),
		  buf, &header->bth);
	buf += IB_BTH_BYTES;

	switch (header->bth.opcode) {
	case IB_OPCODE_UD_SEND_ONLY:
		header->immediate_present = 0;
		break;
	case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
		header->immediate_present = 1;
		break;
	default:
		printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
		       header->bth.opcode);
		return -EINVAL;
	}

	if (header->bth.transport_header_version != 0) {
		printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n",
		       header->bth.transport_header_version);
		return -EINVAL;
	}

	ib_unpack(deth_table, ARRAY_SIZE(deth_table),
		  buf, &header->deth);
	buf += IB_DETH_BYTES;

	if (header->immediate_present)
		memcpy(&header->immediate_data, buf, sizeof header->immediate_data);

	return 0;
}
EXPORT_SYMBOL(ib_ud_header_unpack);