1 /*
2 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/errno.h>
35 #include <linux/string.h>
36
37 #include <rdma/ib_pack.h>
38
39 #define STRUCT_FIELD(header, field) \
40 .struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field), \
41 .struct_size_bytes = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \
42 .field_name = #header ":" #field
43
44 static const struct ib_field lrh_table[] = {
45 { STRUCT_FIELD(lrh, virtual_lane),
46 .offset_words = 0,
47 .offset_bits = 0,
48 .size_bits = 4 },
49 { STRUCT_FIELD(lrh, link_version),
50 .offset_words = 0,
51 .offset_bits = 4,
52 .size_bits = 4 },
53 { STRUCT_FIELD(lrh, service_level),
54 .offset_words = 0,
55 .offset_bits = 8,
56 .size_bits = 4 },
57 { RESERVED,
58 .offset_words = 0,
59 .offset_bits = 12,
60 .size_bits = 2 },
61 { STRUCT_FIELD(lrh, link_next_header),
62 .offset_words = 0,
63 .offset_bits = 14,
64 .size_bits = 2 },
65 { STRUCT_FIELD(lrh, destination_lid),
66 .offset_words = 0,
67 .offset_bits = 16,
68 .size_bits = 16 },
69 { RESERVED,
70 .offset_words = 1,
71 .offset_bits = 0,
72 .size_bits = 5 },
73 { STRUCT_FIELD(lrh, packet_length),
74 .offset_words = 1,
75 .offset_bits = 5,
76 .size_bits = 11 },
77 { STRUCT_FIELD(lrh, source_lid),
78 .offset_words = 1,
79 .offset_bits = 16,
80 .size_bits = 16 }
81 };
82
83 static const struct ib_field grh_table[] = {
84 { STRUCT_FIELD(grh, ip_version),
85 .offset_words = 0,
86 .offset_bits = 0,
87 .size_bits = 4 },
88 { STRUCT_FIELD(grh, traffic_class),
89 .offset_words = 0,
90 .offset_bits = 4,
91 .size_bits = 8 },
92 { STRUCT_FIELD(grh, flow_label),
93 .offset_words = 0,
94 .offset_bits = 12,
95 .size_bits = 20 },
96 { STRUCT_FIELD(grh, payload_length),
97 .offset_words = 1,
98 .offset_bits = 0,
99 .size_bits = 16 },
100 { STRUCT_FIELD(grh, next_header),
101 .offset_words = 1,
102 .offset_bits = 16,
103 .size_bits = 8 },
104 { STRUCT_FIELD(grh, hop_limit),
105 .offset_words = 1,
106 .offset_bits = 24,
107 .size_bits = 8 },
108 { STRUCT_FIELD(grh, source_gid),
109 .offset_words = 2,
110 .offset_bits = 0,
111 .size_bits = 128 },
112 { STRUCT_FIELD(grh, destination_gid),
113 .offset_words = 6,
114 .offset_bits = 0,
115 .size_bits = 128 }
116 };
117
118 static const struct ib_field bth_table[] = {
119 { STRUCT_FIELD(bth, opcode),
120 .offset_words = 0,
121 .offset_bits = 0,
122 .size_bits = 8 },
123 { STRUCT_FIELD(bth, solicited_event),
124 .offset_words = 0,
125 .offset_bits = 8,
126 .size_bits = 1 },
127 { STRUCT_FIELD(bth, mig_req),
128 .offset_words = 0,
129 .offset_bits = 9,
130 .size_bits = 1 },
131 { STRUCT_FIELD(bth, pad_count),
132 .offset_words = 0,
133 .offset_bits = 10,
134 .size_bits = 2 },
135 { STRUCT_FIELD(bth, transport_header_version),
136 .offset_words = 0,
137 .offset_bits = 12,
138 .size_bits = 4 },
139 { STRUCT_FIELD(bth, pkey),
140 .offset_words = 0,
141 .offset_bits = 16,
142 .size_bits = 16 },
143 { RESERVED,
144 .offset_words = 1,
145 .offset_bits = 0,
146 .size_bits = 8 },
147 { STRUCT_FIELD(bth, destination_qpn),
148 .offset_words = 1,
149 .offset_bits = 8,
150 .size_bits = 24 },
151 { STRUCT_FIELD(bth, ack_req),
152 .offset_words = 2,
153 .offset_bits = 0,
154 .size_bits = 1 },
155 { RESERVED,
156 .offset_words = 2,
157 .offset_bits = 1,
158 .size_bits = 7 },
159 { STRUCT_FIELD(bth, psn),
160 .offset_words = 2,
161 .offset_bits = 8,
162 .size_bits = 24 }
163 };
164
165 static const struct ib_field deth_table[] = {
166 { STRUCT_FIELD(deth, qkey),
167 .offset_words = 0,
168 .offset_bits = 0,
169 .size_bits = 32 },
170 { RESERVED,
171 .offset_words = 1,
172 .offset_bits = 0,
173 .size_bits = 8 },
174 { STRUCT_FIELD(deth, source_qpn),
175 .offset_words = 1,
176 .offset_bits = 8,
177 .size_bits = 24 }
178 };
179
180 /**
181 * ib_ud_header_init - Initialize UD header structure
182 * @payload_bytes:Length of packet payload
183 * @grh_present:GRH flag (if non-zero, GRH will be included)
184 * @header:Structure to initialize
185 *
186 * ib_ud_header_init() initializes the lrh.link_version, lrh.link_next_header,
187 * lrh.packet_length, grh.ip_version, grh.payload_length,
188 * grh.next_header, bth.opcode, bth.pad_count and
189 * bth.transport_header_version fields of a &struct ib_ud_header given
190 * the payload length and whether a GRH will be included.
191 */
192 void ib_ud_header_init(int payload_bytes,
193 int grh_present,
194 struct ib_ud_header *header)
195 {
196 int header_len;
197 u16 packet_length;
198
199 memset(header, 0, sizeof *header);
200
201 header_len =
202 IB_LRH_BYTES +
203 IB_BTH_BYTES +
204 IB_DETH_BYTES;
205 if (grh_present) {
206 header_len += IB_GRH_BYTES;
207 }
208
209 header->lrh.link_version = 0;
210 header->lrh.link_next_header =
211 grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
212 packet_length = (IB_LRH_BYTES +
213 IB_BTH_BYTES +
214 IB_DETH_BYTES +
215 payload_bytes +
216 4 + /* ICRC */
217 3) / 4; /* round up */
218
219 header->grh_present = grh_present;
220 if (grh_present) {
221 packet_length += IB_GRH_BYTES / 4;
222 header->grh.ip_version = 6;
223 header->grh.payload_length =
224 cpu_to_be16((IB_BTH_BYTES +
225 IB_DETH_BYTES +
226 payload_bytes +
227 4 + /* ICRC */
228 3) & ~3); /* round up */
229 header->grh.next_header = 0x1b;
230 }
231
232 header->lrh.packet_length = cpu_to_be16(packet_length);
233
234 if (header->immediate_present)
235 header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
236 else
237 header->bth.opcode = IB_OPCODE_UD_SEND_ONLY;
238 header->bth.pad_count = (4 - payload_bytes) & 3;
239 header->bth.transport_header_version = 0;
240 }
241 EXPORT_SYMBOL(ib_ud_header_init);
242
243 /**
244 * ib_ud_header_pack - Pack UD header struct into wire format
245 * @header:UD header struct
246 * @buf:Buffer to pack into
247 *
248 * ib_ud_header_pack() packs the UD header structure @header into wire
249 * format in the buffer @buf.
250 */
251 int ib_ud_header_pack(struct ib_ud_header *header,
252 void *buf)
253 {
254 int len = 0;
255
256 ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
257 &header->lrh, buf);
258 len += IB_LRH_BYTES;
259
260 if (header->grh_present) {
261 ib_pack(grh_table, ARRAY_SIZE(grh_table),
262 &header->grh, buf + len);
263 len += IB_GRH_BYTES;
264 }
265
266 ib_pack(bth_table, ARRAY_SIZE(bth_table),
267 &header->bth, buf + len);
268 len += IB_BTH_BYTES;
269
270 ib_pack(deth_table, ARRAY_SIZE(deth_table),
271 &header->deth, buf + len);
272 len += IB_DETH_BYTES;
273
274 if (header->immediate_present) {
275 memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
276 len += sizeof header->immediate_data;
277 }
278
279 return len;
280 }
281 EXPORT_SYMBOL(ib_ud_header_pack);
282
283 /**
284 * ib_ud_header_unpack - Unpack UD header struct from wire format
285 * @header:UD header struct
286 * @buf:Buffer to pack into
287 *
288 * ib_ud_header_pack() unpacks the UD header structure @header from wire
289 * format in the buffer @buf.
290 */
291 int ib_ud_header_unpack(void *buf,
292 struct ib_ud_header *header)
293 {
294 ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
295 buf, &header->lrh);
296 buf += IB_LRH_BYTES;
297
298 if (header->lrh.link_version != 0) {
299 printk(KERN_WARNING "Invalid LRH.link_version %d\n",
300 header->lrh.link_version);
301 return -EINVAL;
302 }
303
304 switch (header->lrh.link_next_header) {
305 case IB_LNH_IBA_LOCAL:
306 header->grh_present = 0;
307 break;
308
309 case IB_LNH_IBA_GLOBAL:
310 header->grh_present = 1;
311 ib_unpack(grh_table, ARRAY_SIZE(grh_table),
312 buf, &header->grh);
313 buf += IB_GRH_BYTES;
314
315 if (header->grh.ip_version != 6) {
316 printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
317 header->grh.ip_version);
318 return -EINVAL;
319 }
320 if (header->grh.next_header != 0x1b) {
321 printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
322 header->grh.next_header);
323 return -EINVAL;
324 }
325 break;
326
327 default:
328 printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
329 header->lrh.link_next_header);
330 return -EINVAL;
331 }
332
333 ib_unpack(bth_table, ARRAY_SIZE(bth_table),
334 buf, &header->bth);
335 buf += IB_BTH_BYTES;
336
337 switch (header->bth.opcode) {
338 case IB_OPCODE_UD_SEND_ONLY:
339 header->immediate_present = 0;
340 break;
341 case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
342 header->immediate_present = 1;
343 break;
344 default:
345 printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
346 header->bth.opcode);
347 return -EINVAL;
348 }
349
350 if (header->bth.transport_header_version != 0) {
351 printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n",
352 header->bth.transport_header_version);
353 return -EINVAL;
354 }
355
356 ib_unpack(deth_table, ARRAY_SIZE(deth_table),
357 buf, &header->deth);
358 buf += IB_DETH_BYTES;
359
360 if (header->immediate_present)
361 memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
362
363 return 0;
364 }
365 EXPORT_SYMBOL(ib_ud_header_unpack);
366
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