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>
38 #include <rdma/ib_pack.h>
40 #define STRUCT_FIELD(header, field) \
41 .struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field), \
42 .struct_size_bytes = sizeof ((struct ib_unpacked_ ## header *) 0)->field, \
43 .field_name = #header ":" #field
45 static const struct ib_field lrh_table[] = {
46 { STRUCT_FIELD(lrh, virtual_lane),
50 { STRUCT_FIELD(lrh, link_version),
54 { STRUCT_FIELD(lrh, service_level),
62 { STRUCT_FIELD(lrh, link_next_header),
66 { STRUCT_FIELD(lrh, destination_lid),
74 { STRUCT_FIELD(lrh, packet_length),
78 { STRUCT_FIELD(lrh, source_lid),
84 static const struct ib_field grh_table[] = {
85 { STRUCT_FIELD(grh, ip_version),
89 { STRUCT_FIELD(grh, traffic_class),
93 { STRUCT_FIELD(grh, flow_label),
97 { STRUCT_FIELD(grh, payload_length),
101 { STRUCT_FIELD(grh, next_header),
105 { STRUCT_FIELD(grh, hop_limit),
109 { STRUCT_FIELD(grh, source_gid),
113 { STRUCT_FIELD(grh, destination_gid),
119 static const struct ib_field bth_table[] = {
120 { STRUCT_FIELD(bth, opcode),
124 { STRUCT_FIELD(bth, solicited_event),
128 { STRUCT_FIELD(bth, mig_req),
132 { STRUCT_FIELD(bth, pad_count),
136 { STRUCT_FIELD(bth, transport_header_version),
140 { STRUCT_FIELD(bth, pkey),
148 { STRUCT_FIELD(bth, destination_qpn),
152 { STRUCT_FIELD(bth, ack_req),
160 { STRUCT_FIELD(bth, psn),
166 static const struct ib_field deth_table[] = {
167 { STRUCT_FIELD(deth, qkey),
175 { STRUCT_FIELD(deth, source_qpn),
182 * ib_ud_header_init - Initialize UD header structure
183 * @payload_bytes:Length of packet payload
184 * @grh_present:GRH flag (if non-zero, GRH will be included)
185 * @header:Structure to initialize
187 * ib_ud_header_init() initializes the lrh.link_version, lrh.link_next_header,
188 * lrh.packet_length, grh.ip_version, grh.payload_length,
189 * grh.next_header, bth.opcode, bth.pad_count and
190 * bth.transport_header_version fields of a &struct ib_ud_header given
191 * the payload length and whether a GRH will be included.
193 void ib_ud_header_init(int payload_bytes,
195 struct ib_ud_header *header)
200 memset(header, 0, sizeof *header);
207 header_len += IB_GRH_BYTES;
210 header->lrh.link_version = 0;
211 header->lrh.link_next_header =
212 grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
213 packet_length = (IB_LRH_BYTES +
218 3) / 4; /* round up */
220 header->grh_present = grh_present;
222 packet_length += IB_GRH_BYTES / 4;
223 header->grh.ip_version = 6;
224 header->grh.payload_length =
225 cpu_to_be16((IB_BTH_BYTES +
229 3) & ~3); /* round up */
230 header->grh.next_header = 0x1b;
233 header->lrh.packet_length = cpu_to_be16(packet_length);
235 if (header->immediate_present)
236 header->bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
238 header->bth.opcode = IB_OPCODE_UD_SEND_ONLY;
239 header->bth.pad_count = (4 - payload_bytes) & 3;
240 header->bth.transport_header_version = 0;
242 EXPORT_SYMBOL(ib_ud_header_init);
245 * ib_ud_header_pack - Pack UD header struct into wire format
246 * @header:UD header struct
247 * @buf:Buffer to pack into
249 * ib_ud_header_pack() packs the UD header structure @header into wire
250 * format in the buffer @buf.
252 int ib_ud_header_pack(struct ib_ud_header *header,
257 ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
261 if (header->grh_present) {
262 ib_pack(grh_table, ARRAY_SIZE(grh_table),
263 &header->grh, buf + len);
267 ib_pack(bth_table, ARRAY_SIZE(bth_table),
268 &header->bth, buf + len);
271 ib_pack(deth_table, ARRAY_SIZE(deth_table),
272 &header->deth, buf + len);
273 len += IB_DETH_BYTES;
275 if (header->immediate_present) {
276 memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
277 len += sizeof header->immediate_data;
282 EXPORT_SYMBOL(ib_ud_header_pack);
285 * ib_ud_header_unpack - Unpack UD header struct from wire format
286 * @header:UD header struct
287 * @buf:Buffer to pack into
289 * ib_ud_header_pack() unpacks the UD header structure @header from wire
290 * format in the buffer @buf.
292 int ib_ud_header_unpack(void *buf,
293 struct ib_ud_header *header)
295 ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
299 if (header->lrh.link_version != 0) {
300 printk(KERN_WARNING "Invalid LRH.link_version %d\n",
301 header->lrh.link_version);
305 switch (header->lrh.link_next_header) {
306 case IB_LNH_IBA_LOCAL:
307 header->grh_present = 0;
310 case IB_LNH_IBA_GLOBAL:
311 header->grh_present = 1;
312 ib_unpack(grh_table, ARRAY_SIZE(grh_table),
316 if (header->grh.ip_version != 6) {
317 printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
318 header->grh.ip_version);
321 if (header->grh.next_header != 0x1b) {
322 printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
323 header->grh.next_header);
329 printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
330 header->lrh.link_next_header);
334 ib_unpack(bth_table, ARRAY_SIZE(bth_table),
338 switch (header->bth.opcode) {
339 case IB_OPCODE_UD_SEND_ONLY:
340 header->immediate_present = 0;
342 case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
343 header->immediate_present = 1;
346 printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
351 if (header->bth.transport_header_version != 0) {
352 printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n",
353 header->bth.transport_header_version);
357 ib_unpack(deth_table, ARRAY_SIZE(deth_table),
359 buf += IB_DETH_BYTES;
361 if (header->immediate_present)
362 memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
366 EXPORT_SYMBOL(ib_ud_header_unpack);