2 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
33 * $Id: ud_header.c 1349 2004-12-16 21:09:43Z roland $
36 #include <linux/errno.h>
37 #include <linux/string.h>
39 #include <rdma/ib_pack.h>
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
46 static const struct ib_field lrh_table[] = {
47 { STRUCT_FIELD(lrh, virtual_lane),
51 { STRUCT_FIELD(lrh, link_version),
55 { STRUCT_FIELD(lrh, service_level),
63 { STRUCT_FIELD(lrh, link_next_header),
67 { STRUCT_FIELD(lrh, destination_lid),
75 { STRUCT_FIELD(lrh, packet_length),
79 { STRUCT_FIELD(lrh, source_lid),
85 static const struct ib_field grh_table[] = {
86 { STRUCT_FIELD(grh, ip_version),
90 { STRUCT_FIELD(grh, traffic_class),
94 { STRUCT_FIELD(grh, flow_label),
98 { STRUCT_FIELD(grh, payload_length),
102 { STRUCT_FIELD(grh, next_header),
106 { STRUCT_FIELD(grh, hop_limit),
110 { STRUCT_FIELD(grh, source_gid),
114 { STRUCT_FIELD(grh, destination_gid),
120 static const struct ib_field bth_table[] = {
121 { STRUCT_FIELD(bth, opcode),
125 { STRUCT_FIELD(bth, solicited_event),
129 { STRUCT_FIELD(bth, mig_req),
133 { STRUCT_FIELD(bth, pad_count),
137 { STRUCT_FIELD(bth, transport_header_version),
141 { STRUCT_FIELD(bth, pkey),
149 { STRUCT_FIELD(bth, destination_qpn),
153 { STRUCT_FIELD(bth, ack_req),
161 { STRUCT_FIELD(bth, psn),
167 static const struct ib_field deth_table[] = {
168 { STRUCT_FIELD(deth, qkey),
176 { STRUCT_FIELD(deth, source_qpn),
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
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.
194 void ib_ud_header_init(int payload_bytes,
196 struct ib_ud_header *header)
201 memset(header, 0, sizeof *header);
208 header_len += IB_GRH_BYTES;
211 header->lrh.link_version = 0;
212 header->lrh.link_next_header =
213 grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
214 packet_length = (IB_LRH_BYTES +
219 3) / 4; /* round up */
221 header->grh_present = grh_present;
223 packet_length += IB_GRH_BYTES / 4;
224 header->grh.ip_version = 6;
225 header->grh.payload_length =
226 cpu_to_be16((IB_BTH_BYTES +
230 3) & ~3); /* round up */
231 header->grh.next_header = 0x1b;
234 header->lrh.packet_length = cpu_to_be16(packet_length);
236 if (header->immediate_present)
237 header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
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;
243 EXPORT_SYMBOL(ib_ud_header_init);
246 * ib_ud_header_pack - Pack UD header struct into wire format
247 * @header:UD header struct
248 * @buf:Buffer to pack into
250 * ib_ud_header_pack() packs the UD header structure @header into wire
251 * format in the buffer @buf.
253 int ib_ud_header_pack(struct ib_ud_header *header,
258 ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
262 if (header->grh_present) {
263 ib_pack(grh_table, ARRAY_SIZE(grh_table),
264 &header->grh, buf + len);
268 ib_pack(bth_table, ARRAY_SIZE(bth_table),
269 &header->bth, buf + len);
272 ib_pack(deth_table, ARRAY_SIZE(deth_table),
273 &header->deth, buf + len);
274 len += IB_DETH_BYTES;
276 if (header->immediate_present) {
277 memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
278 len += sizeof header->immediate_data;
283 EXPORT_SYMBOL(ib_ud_header_pack);
286 * ib_ud_header_unpack - Unpack UD header struct from wire format
287 * @header:UD header struct
288 * @buf:Buffer to pack into
290 * ib_ud_header_pack() unpacks the UD header structure @header from wire
291 * format in the buffer @buf.
293 int ib_ud_header_unpack(void *buf,
294 struct ib_ud_header *header)
296 ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
300 if (header->lrh.link_version != 0) {
301 printk(KERN_WARNING "Invalid LRH.link_version %d\n",
302 header->lrh.link_version);
306 switch (header->lrh.link_next_header) {
307 case IB_LNH_IBA_LOCAL:
308 header->grh_present = 0;
311 case IB_LNH_IBA_GLOBAL:
312 header->grh_present = 1;
313 ib_unpack(grh_table, ARRAY_SIZE(grh_table),
317 if (header->grh.ip_version != 6) {
318 printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
319 header->grh.ip_version);
322 if (header->grh.next_header != 0x1b) {
323 printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
324 header->grh.next_header);
330 printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
331 header->lrh.link_next_header);
335 ib_unpack(bth_table, ARRAY_SIZE(bth_table),
339 switch (header->bth.opcode) {
340 case IB_OPCODE_UD_SEND_ONLY:
341 header->immediate_present = 0;
343 case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
344 header->immediate_present = 1;
347 printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
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);
358 ib_unpack(deth_table, ARRAY_SIZE(deth_table),
360 buf += IB_DETH_BYTES;
362 if (header->immediate_present)
363 memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
367 EXPORT_SYMBOL(ib_ud_header_unpack);