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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Corporation. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | * $Id: ud_header.c 1349 2004-12-16 21:09:43Z roland $ | |
33 | */ | |
34 | ||
35 | #include <linux/errno.h> | |
36 | ||
37 | #include <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 | ||
198 | memset(header, 0, sizeof *header); | |
199 | ||
200 | header_len = | |
201 | IB_LRH_BYTES + | |
202 | IB_BTH_BYTES + | |
203 | IB_DETH_BYTES; | |
204 | if (grh_present) { | |
205 | header_len += IB_GRH_BYTES; | |
206 | } | |
207 | ||
208 | header->lrh.link_version = 0; | |
209 | header->lrh.link_next_header = | |
210 | grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL; | |
211 | header->lrh.packet_length = (IB_LRH_BYTES + | |
212 | IB_BTH_BYTES + | |
213 | IB_DETH_BYTES + | |
214 | payload_bytes + | |
215 | 4 + /* ICRC */ | |
216 | 3) / 4; /* round up */ | |
217 | ||
218 | header->grh_present = grh_present; | |
219 | if (grh_present) { | |
220 | header->lrh.packet_length += IB_GRH_BYTES / 4; | |
221 | ||
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 | cpu_to_be16s(&header->lrh.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); |