drivers/infiniband/core/ud_header.c

   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  * $Id: ud_header.c 1349 2004-12-16 21:09:43Z roland $
  34  */
  35
  36 #include <linux/errno.h>
  37 #include <linux/string.h>
  38
  39 #include <rdma/ib_pack.h>
  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;
 199         u16 packet_length;
 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;
 214         packet_length                = (IB_LRH_BYTES     +
 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) {
 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     +
 227                                      IB_DETH_BYTES    +
 228                                      payload_bytes    +
 229                                      4                + /* ICRC     */
 230                                      3) & ~3);          /* round up */
 231                 header->grh.next_header     = 0x1b;
 232         }
 233
 234         header->lrh.packet_length = cpu_to_be16(packet_length);
 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);