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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Corporation. All rights reserved. | |
2a1d9b7f | 3 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. |
1da177e4 LT |
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 | * $Id: ud_header.c 1349 2004-12-16 21:09:43Z roland $ | |
34 | */ | |
35 | ||
36 | #include <linux/errno.h> | |
8c65b4a6 | 37 | #include <linux/string.h> |
1da177e4 | 38 | |
a4d61e84 | 39 | #include <rdma/ib_pack.h> |
1da177e4 LT |
40 | |
41 | #define STRUCT_FIELD(header, field) \ | |
42 | .struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field), \ | |
43 | .struct_size_bytes = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \ | |
44 | .field_name = #header ":" #field | |
45 | ||
46 | static const struct ib_field lrh_table[] = { | |
47 | { STRUCT_FIELD(lrh, virtual_lane), | |
48 | .offset_words = 0, | |
49 | .offset_bits = 0, | |
50 | .size_bits = 4 }, | |
51 | { STRUCT_FIELD(lrh, link_version), | |
52 | .offset_words = 0, | |
53 | .offset_bits = 4, | |
54 | .size_bits = 4 }, | |
55 | { STRUCT_FIELD(lrh, service_level), | |
56 | .offset_words = 0, | |
57 | .offset_bits = 8, | |
58 | .size_bits = 4 }, | |
59 | { RESERVED, | |
60 | .offset_words = 0, | |
61 | .offset_bits = 12, | |
62 | .size_bits = 2 }, | |
63 | { STRUCT_FIELD(lrh, link_next_header), | |
64 | .offset_words = 0, | |
65 | .offset_bits = 14, | |
66 | .size_bits = 2 }, | |
67 | { STRUCT_FIELD(lrh, destination_lid), | |
68 | .offset_words = 0, | |
69 | .offset_bits = 16, | |
70 | .size_bits = 16 }, | |
71 | { RESERVED, | |
72 | .offset_words = 1, | |
73 | .offset_bits = 0, | |
74 | .size_bits = 5 }, | |
75 | { STRUCT_FIELD(lrh, packet_length), | |
76 | .offset_words = 1, | |
77 | .offset_bits = 5, | |
78 | .size_bits = 11 }, | |
79 | { STRUCT_FIELD(lrh, source_lid), | |
80 | .offset_words = 1, | |
81 | .offset_bits = 16, | |
82 | .size_bits = 16 } | |
83 | }; | |
84 | ||
85 | static const struct ib_field grh_table[] = { | |
86 | { STRUCT_FIELD(grh, ip_version), | |
87 | .offset_words = 0, | |
88 | .offset_bits = 0, | |
89 | .size_bits = 4 }, | |
90 | { STRUCT_FIELD(grh, traffic_class), | |
91 | .offset_words = 0, | |
92 | .offset_bits = 4, | |
93 | .size_bits = 8 }, | |
94 | { STRUCT_FIELD(grh, flow_label), | |
95 | .offset_words = 0, | |
96 | .offset_bits = 12, | |
97 | .size_bits = 20 }, | |
98 | { STRUCT_FIELD(grh, payload_length), | |
99 | .offset_words = 1, | |
100 | .offset_bits = 0, | |
101 | .size_bits = 16 }, | |
102 | { STRUCT_FIELD(grh, next_header), | |
103 | .offset_words = 1, | |
104 | .offset_bits = 16, | |
105 | .size_bits = 8 }, | |
106 | { STRUCT_FIELD(grh, hop_limit), | |
107 | .offset_words = 1, | |
108 | .offset_bits = 24, | |
109 | .size_bits = 8 }, | |
110 | { STRUCT_FIELD(grh, source_gid), | |
111 | .offset_words = 2, | |
112 | .offset_bits = 0, | |
113 | .size_bits = 128 }, | |
114 | { STRUCT_FIELD(grh, destination_gid), | |
115 | .offset_words = 6, | |
116 | .offset_bits = 0, | |
117 | .size_bits = 128 } | |
118 | }; | |
119 | ||
120 | static const struct ib_field bth_table[] = { | |
121 | { STRUCT_FIELD(bth, opcode), | |
122 | .offset_words = 0, | |
123 | .offset_bits = 0, | |
124 | .size_bits = 8 }, | |
125 | { STRUCT_FIELD(bth, solicited_event), | |
126 | .offset_words = 0, | |
127 | .offset_bits = 8, | |
128 | .size_bits = 1 }, | |
129 | { STRUCT_FIELD(bth, mig_req), | |
130 | .offset_words = 0, | |
131 | .offset_bits = 9, | |
132 | .size_bits = 1 }, | |
133 | { STRUCT_FIELD(bth, pad_count), | |
134 | .offset_words = 0, | |
135 | .offset_bits = 10, | |
136 | .size_bits = 2 }, | |
137 | { STRUCT_FIELD(bth, transport_header_version), | |
138 | .offset_words = 0, | |
139 | .offset_bits = 12, | |
140 | .size_bits = 4 }, | |
141 | { STRUCT_FIELD(bth, pkey), | |
142 | .offset_words = 0, | |
143 | .offset_bits = 16, | |
144 | .size_bits = 16 }, | |
145 | { RESERVED, | |
146 | .offset_words = 1, | |
147 | .offset_bits = 0, | |
148 | .size_bits = 8 }, | |
149 | { STRUCT_FIELD(bth, destination_qpn), | |
150 | .offset_words = 1, | |
151 | .offset_bits = 8, | |
152 | .size_bits = 24 }, | |
153 | { STRUCT_FIELD(bth, ack_req), | |
154 | .offset_words = 2, | |
155 | .offset_bits = 0, | |
156 | .size_bits = 1 }, | |
157 | { RESERVED, | |
158 | .offset_words = 2, | |
159 | .offset_bits = 1, | |
160 | .size_bits = 7 }, | |
161 | { STRUCT_FIELD(bth, psn), | |
162 | .offset_words = 2, | |
163 | .offset_bits = 8, | |
164 | .size_bits = 24 } | |
165 | }; | |
166 | ||
167 | static const struct ib_field deth_table[] = { | |
168 | { STRUCT_FIELD(deth, qkey), | |
169 | .offset_words = 0, | |
170 | .offset_bits = 0, | |
171 | .size_bits = 32 }, | |
172 | { RESERVED, | |
173 | .offset_words = 1, | |
174 | .offset_bits = 0, | |
175 | .size_bits = 8 }, | |
176 | { STRUCT_FIELD(deth, source_qpn), | |
177 | .offset_words = 1, | |
178 | .offset_bits = 8, | |
179 | .size_bits = 24 } | |
180 | }; | |
181 | ||
182 | /** | |
183 | * ib_ud_header_init - Initialize UD header structure | |
184 | * @payload_bytes:Length of packet payload | |
185 | * @grh_present:GRH flag (if non-zero, GRH will be included) | |
186 | * @header:Structure to initialize | |
187 | * | |
188 | * ib_ud_header_init() initializes the lrh.link_version, lrh.link_next_header, | |
189 | * lrh.packet_length, grh.ip_version, grh.payload_length, | |
190 | * grh.next_header, bth.opcode, bth.pad_count and | |
191 | * bth.transport_header_version fields of a &struct ib_ud_header given | |
192 | * the payload length and whether a GRH will be included. | |
193 | */ | |
194 | void ib_ud_header_init(int payload_bytes, | |
195 | int grh_present, | |
196 | struct ib_ud_header *header) | |
197 | { | |
198 | int header_len; | |
97f52eb4 | 199 | u16 packet_length; |
1da177e4 LT |
200 | |
201 | memset(header, 0, sizeof *header); | |
202 | ||
203 | header_len = | |
204 | IB_LRH_BYTES + | |
205 | IB_BTH_BYTES + | |
206 | IB_DETH_BYTES; | |
207 | if (grh_present) { | |
208 | header_len += IB_GRH_BYTES; | |
209 | } | |
210 | ||
211 | header->lrh.link_version = 0; | |
212 | header->lrh.link_next_header = | |
213 | grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL; | |
97f52eb4 | 214 | packet_length = (IB_LRH_BYTES + |
1da177e4 LT |
215 | IB_BTH_BYTES + |
216 | IB_DETH_BYTES + | |
217 | payload_bytes + | |
218 | 4 + /* ICRC */ | |
219 | 3) / 4; /* round up */ | |
220 | ||
221 | header->grh_present = grh_present; | |
222 | if (grh_present) { | |
97f52eb4 | 223 | packet_length += IB_GRH_BYTES / 4; |
1da177e4 LT |
224 | header->grh.ip_version = 6; |
225 | header->grh.payload_length = | |
226 | cpu_to_be16((IB_BTH_BYTES + | |
227 | IB_DETH_BYTES + | |
228 | payload_bytes + | |
229 | 4 + /* ICRC */ | |
230 | 3) & ~3); /* round up */ | |
231 | header->grh.next_header = 0x1b; | |
232 | } | |
233 | ||
97f52eb4 | 234 | header->lrh.packet_length = cpu_to_be16(packet_length); |
1da177e4 LT |
235 | |
236 | if (header->immediate_present) | |
237 | header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; | |
238 | else | |
239 | header->bth.opcode = IB_OPCODE_UD_SEND_ONLY; | |
240 | header->bth.pad_count = (4 - payload_bytes) & 3; | |
241 | header->bth.transport_header_version = 0; | |
242 | } | |
243 | EXPORT_SYMBOL(ib_ud_header_init); | |
244 | ||
245 | /** | |
246 | * ib_ud_header_pack - Pack UD header struct into wire format | |
247 | * @header:UD header struct | |
248 | * @buf:Buffer to pack into | |
249 | * | |
250 | * ib_ud_header_pack() packs the UD header structure @header into wire | |
251 | * format in the buffer @buf. | |
252 | */ | |
253 | int ib_ud_header_pack(struct ib_ud_header *header, | |
254 | void *buf) | |
255 | { | |
256 | int len = 0; | |
257 | ||
258 | ib_pack(lrh_table, ARRAY_SIZE(lrh_table), | |
259 | &header->lrh, buf); | |
260 | len += IB_LRH_BYTES; | |
261 | ||
262 | if (header->grh_present) { | |
263 | ib_pack(grh_table, ARRAY_SIZE(grh_table), | |
264 | &header->grh, buf + len); | |
265 | len += IB_GRH_BYTES; | |
266 | } | |
267 | ||
268 | ib_pack(bth_table, ARRAY_SIZE(bth_table), | |
269 | &header->bth, buf + len); | |
270 | len += IB_BTH_BYTES; | |
271 | ||
272 | ib_pack(deth_table, ARRAY_SIZE(deth_table), | |
273 | &header->deth, buf + len); | |
274 | len += IB_DETH_BYTES; | |
275 | ||
276 | if (header->immediate_present) { | |
277 | memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data); | |
278 | len += sizeof header->immediate_data; | |
279 | } | |
280 | ||
281 | return len; | |
282 | } | |
283 | EXPORT_SYMBOL(ib_ud_header_pack); | |
284 | ||
285 | /** | |
286 | * ib_ud_header_unpack - Unpack UD header struct from wire format | |
287 | * @header:UD header struct | |
288 | * @buf:Buffer to pack into | |
289 | * | |
290 | * ib_ud_header_pack() unpacks the UD header structure @header from wire | |
291 | * format in the buffer @buf. | |
292 | */ | |
293 | int ib_ud_header_unpack(void *buf, | |
294 | struct ib_ud_header *header) | |
295 | { | |
296 | ib_unpack(lrh_table, ARRAY_SIZE(lrh_table), | |
297 | buf, &header->lrh); | |
298 | buf += IB_LRH_BYTES; | |
299 | ||
300 | if (header->lrh.link_version != 0) { | |
301 | printk(KERN_WARNING "Invalid LRH.link_version %d\n", | |
302 | header->lrh.link_version); | |
303 | return -EINVAL; | |
304 | } | |
305 | ||
306 | switch (header->lrh.link_next_header) { | |
307 | case IB_LNH_IBA_LOCAL: | |
308 | header->grh_present = 0; | |
309 | break; | |
310 | ||
311 | case IB_LNH_IBA_GLOBAL: | |
312 | header->grh_present = 1; | |
313 | ib_unpack(grh_table, ARRAY_SIZE(grh_table), | |
314 | buf, &header->grh); | |
315 | buf += IB_GRH_BYTES; | |
316 | ||
317 | if (header->grh.ip_version != 6) { | |
318 | printk(KERN_WARNING "Invalid GRH.ip_version %d\n", | |
319 | header->grh.ip_version); | |
320 | return -EINVAL; | |
321 | } | |
322 | if (header->grh.next_header != 0x1b) { | |
323 | printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n", | |
324 | header->grh.next_header); | |
325 | return -EINVAL; | |
326 | } | |
327 | break; | |
328 | ||
329 | default: | |
330 | printk(KERN_WARNING "Invalid LRH.link_next_header %d\n", | |
331 | header->lrh.link_next_header); | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
335 | ib_unpack(bth_table, ARRAY_SIZE(bth_table), | |
336 | buf, &header->bth); | |
337 | buf += IB_BTH_BYTES; | |
338 | ||
339 | switch (header->bth.opcode) { | |
340 | case IB_OPCODE_UD_SEND_ONLY: | |
341 | header->immediate_present = 0; | |
342 | break; | |
343 | case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE: | |
344 | header->immediate_present = 1; | |
345 | break; | |
346 | default: | |
347 | printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n", | |
348 | header->bth.opcode); | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | if (header->bth.transport_header_version != 0) { | |
353 | printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n", | |
354 | header->bth.transport_header_version); | |
355 | return -EINVAL; | |
356 | } | |
357 | ||
358 | ib_unpack(deth_table, ARRAY_SIZE(deth_table), | |
359 | buf, &header->deth); | |
360 | buf += IB_DETH_BYTES; | |
361 | ||
362 | if (header->immediate_present) | |
363 | memcpy(&header->immediate_data, buf, sizeof header->immediate_data); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | EXPORT_SYMBOL(ib_ud_header_unpack); |