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
  34 #include <linux/errno.h>
  35 #include <linux/string.h>
  36 #include <linux/export.h>
  37 #include <linux/if_ether.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 eth_table[]  = {
  86         { STRUCT_FIELD(eth, dmac_h),
  87           .offset_words = 0,
  88           .offset_bits  = 0,
  89           .size_bits    = 32 },
  90         { STRUCT_FIELD(eth, dmac_l),
  91           .offset_words = 1,
  92           .offset_bits  = 0,
  93           .size_bits    = 16 },
  94         { STRUCT_FIELD(eth, smac_h),
  95           .offset_words = 1,
  96           .offset_bits  = 16,
  97           .size_bits    = 16 },
  98         { STRUCT_FIELD(eth, smac_l),
  99           .offset_words = 2,
 100           .offset_bits  = 0,
 101           .size_bits    = 32 },
 102         { STRUCT_FIELD(eth, type),
 103           .offset_words = 3,
 104           .offset_bits  = 0,
 105           .size_bits    = 16 }
 106 };
 107
 108 static const struct ib_field vlan_table[]  = {
 109         { STRUCT_FIELD(vlan, tag),
 110           .offset_words = 0,
 111           .offset_bits  = 0,
 112           .size_bits    = 16 },
 113         { STRUCT_FIELD(vlan, type),
 114           .offset_words = 0,
 115           .offset_bits  = 16,
 116           .size_bits    = 16 }
 117 };
 118
 119 static const struct ib_field grh_table[]  = {
 120         { STRUCT_FIELD(grh, ip_version),
 121           .offset_words = 0,
 122           .offset_bits  = 0,
 123           .size_bits    = 4 },
 124         { STRUCT_FIELD(grh, traffic_class),
 125           .offset_words = 0,
 126           .offset_bits  = 4,
 127           .size_bits    = 8 },
 128         { STRUCT_FIELD(grh, flow_label),
 129           .offset_words = 0,
 130           .offset_bits  = 12,
 131           .size_bits    = 20 },
 132         { STRUCT_FIELD(grh, payload_length),
 133           .offset_words = 1,
 134           .offset_bits  = 0,
 135           .size_bits    = 16 },
 136         { STRUCT_FIELD(grh, next_header),
 137           .offset_words = 1,
 138           .offset_bits  = 16,
 139           .size_bits    = 8 },
 140         { STRUCT_FIELD(grh, hop_limit),
 141           .offset_words = 1,
 142           .offset_bits  = 24,
 143           .size_bits    = 8 },
 144         { STRUCT_FIELD(grh, source_gid),
 145           .offset_words = 2,
 146           .offset_bits  = 0,
 147           .size_bits    = 128 },
 148         { STRUCT_FIELD(grh, destination_gid),
 149           .offset_words = 6,
 150           .offset_bits  = 0,
 151           .size_bits    = 128 }
 152 };
 153
 154 static const struct ib_field bth_table[]  = {
 155         { STRUCT_FIELD(bth, opcode),
 156           .offset_words = 0,
 157           .offset_bits  = 0,
 158           .size_bits    = 8 },
 159         { STRUCT_FIELD(bth, solicited_event),
 160           .offset_words = 0,
 161           .offset_bits  = 8,
 162           .size_bits    = 1 },
 163         { STRUCT_FIELD(bth, mig_req),
 164           .offset_words = 0,
 165           .offset_bits  = 9,
 166           .size_bits    = 1 },
 167         { STRUCT_FIELD(bth, pad_count),
 168           .offset_words = 0,
 169           .offset_bits  = 10,
 170           .size_bits    = 2 },
 171         { STRUCT_FIELD(bth, transport_header_version),
 172           .offset_words = 0,
 173           .offset_bits  = 12,
 174           .size_bits    = 4 },
 175         { STRUCT_FIELD(bth, pkey),
 176           .offset_words = 0,
 177           .offset_bits  = 16,
 178           .size_bits    = 16 },
 179         { RESERVED,
 180           .offset_words = 1,
 181           .offset_bits  = 0,
 182           .size_bits    = 8 },
 183         { STRUCT_FIELD(bth, destination_qpn),
 184           .offset_words = 1,
 185           .offset_bits  = 8,
 186           .size_bits    = 24 },
 187         { STRUCT_FIELD(bth, ack_req),
 188           .offset_words = 2,
 189           .offset_bits  = 0,
 190           .size_bits    = 1 },
 191         { RESERVED,
 192           .offset_words = 2,
 193           .offset_bits  = 1,
 194           .size_bits    = 7 },
 195         { STRUCT_FIELD(bth, psn),
 196           .offset_words = 2,
 197           .offset_bits  = 8,
 198           .size_bits    = 24 }
 199 };
 200
 201 static const struct ib_field deth_table[] = {
 202         { STRUCT_FIELD(deth, qkey),
 203           .offset_words = 0,
 204           .offset_bits  = 0,
 205           .size_bits    = 32 },
 206         { RESERVED,
 207           .offset_words = 1,
 208           .offset_bits  = 0,
 209           .size_bits    = 8 },
 210         { STRUCT_FIELD(deth, source_qpn),
 211           .offset_words = 1,
 212           .offset_bits  = 8,
 213           .size_bits    = 24 }
 214 };
 215
 216 /**
 217  * ib_ud_header_init - Initialize UD header structure
 218  * @payload_bytes:Length of packet payload
 219  * @lrh_present: specify if LRH is present
 220  * @eth_present: specify if Eth header is present
 221  * @vlan_present: packet is tagged vlan
 222  * @grh_present:GRH flag (if non-zero, GRH will be included)
 223  * @immediate_present: specify if immediate data is present
 224  * @header:Structure to initialize
 225  */
 226 void ib_ud_header_init(int                  payload_bytes,
 227                        int                  lrh_present,
 228                        int                  eth_present,
 229                        int                  vlan_present,
 230                        int                  grh_present,
 231                        int                  immediate_present,
 232                        struct ib_ud_header *header)
 233 {
 234         memset(header, 0, sizeof *header);
 235
 236         if (lrh_present) {
 237                 u16 packet_length;
 238
 239                 header->lrh.link_version     = 0;
 240                 header->lrh.link_next_header =
 241                         grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
 242                 packet_length = (IB_LRH_BYTES   +
 243                                  IB_BTH_BYTES   +
 244                                  IB_DETH_BYTES  +
 245                                  (grh_present ? IB_GRH_BYTES : 0) +
 246                                  payload_bytes  +
 247                                  4              + /* ICRC     */
 248                                  3) / 4;          /* round up */
 249                 header->lrh.packet_length = cpu_to_be16(packet_length);
 250         }
 251
 252         if (vlan_present)
 253                 header->eth.type = cpu_to_be16(ETH_P_8021Q);
 254
 255         if (grh_present) {
 256                 header->grh.ip_version      = 6;
 257                 header->grh.payload_length  =
 258                         cpu_to_be16((IB_BTH_BYTES     +
 259                                      IB_DETH_BYTES    +
 260                                      payload_bytes    +
 261                                      4                + /* ICRC     */
 262                                      3) & ~3);          /* round up */
 263                 header->grh.next_header     = 0x1b;
 264         }
 265
 266         if (immediate_present)
 267                 header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
 268         else
 269                 header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY;
 270         header->bth.pad_count                = (4 - payload_bytes) & 3;
 271         header->bth.transport_header_version = 0;
 272
 273         header->lrh_present = lrh_present;
 274         header->eth_present = eth_present;
 275         header->vlan_present = vlan_present;
 276         header->grh_present = grh_present;
 277         header->immediate_present = immediate_present;
 278 }
 279 EXPORT_SYMBOL(ib_ud_header_init);
 280
 281 /**
 282  * ib_ud_header_pack - Pack UD header struct into wire format
 283  * @header:UD header struct
 284  * @buf:Buffer to pack into
 285  *
 286  * ib_ud_header_pack() packs the UD header structure @header into wire
 287  * format in the buffer @buf.
 288  */
 289 int ib_ud_header_pack(struct ib_ud_header *header,
 290                       void                *buf)
 291 {
 292         int len = 0;
 293
 294         if (header->lrh_present) {
 295                 ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
 296                         &header->lrh, buf + len);
 297                 len += IB_LRH_BYTES;
 298         }
 299         if (header->eth_present) {
 300                 ib_pack(eth_table, ARRAY_SIZE(eth_table),
 301                         &header->eth, buf + len);
 302                 len += IB_ETH_BYTES;
 303         }
 304         if (header->vlan_present) {
 305                 ib_pack(vlan_table, ARRAY_SIZE(vlan_table),
 306                         &header->vlan, buf + len);
 307                 len += IB_VLAN_BYTES;
 308         }
 309         if (header->grh_present) {
 310                 ib_pack(grh_table, ARRAY_SIZE(grh_table),
 311                         &header->grh, buf + len);
 312                 len += IB_GRH_BYTES;
 313         }
 314
 315         ib_pack(bth_table, ARRAY_SIZE(bth_table),
 316                 &header->bth, buf + len);
 317         len += IB_BTH_BYTES;
 318
 319         ib_pack(deth_table, ARRAY_SIZE(deth_table),
 320                 &header->deth, buf + len);
 321         len += IB_DETH_BYTES;
 322
 323         if (header->immediate_present) {
 324                 memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
 325                 len += sizeof header->immediate_data;
 326         }
 327
 328         return len;
 329 }
 330 EXPORT_SYMBOL(ib_ud_header_pack);
 331
 332 /**
 333  * ib_ud_header_unpack - Unpack UD header struct from wire format
 334  * @header:UD header struct
 335  * @buf:Buffer to pack into
 336  *
 337  * ib_ud_header_pack() unpacks the UD header structure @header from wire
 338  * format in the buffer @buf.
 339  */
 340 int ib_ud_header_unpack(void                *buf,
 341                         struct ib_ud_header *header)
 342 {
 343         ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
 344                   buf, &header->lrh);
 345         buf += IB_LRH_BYTES;
 346
 347         if (header->lrh.link_version != 0) {
 348                 printk(KERN_WARNING "Invalid LRH.link_version %d\n",
 349                        header->lrh.link_version);
 350                 return -EINVAL;
 351         }
 352
 353         switch (header->lrh.link_next_header) {
 354         case IB_LNH_IBA_LOCAL:
 355                 header->grh_present = 0;
 356                 break;
 357
 358         case IB_LNH_IBA_GLOBAL:
 359                 header->grh_present = 1;
 360                 ib_unpack(grh_table, ARRAY_SIZE(grh_table),
 361                           buf, &header->grh);
 362                 buf += IB_GRH_BYTES;
 363
 364                 if (header->grh.ip_version != 6) {
 365                         printk(KERN_WARNING "Invalid GRH.ip_version %d\n",
 366                                header->grh.ip_version);
 367                         return -EINVAL;
 368                 }
 369                 if (header->grh.next_header != 0x1b) {
 370                         printk(KERN_WARNING "Invalid GRH.next_header 0x%02x\n",
 371                                header->grh.next_header);
 372                         return -EINVAL;
 373                 }
 374                 break;
 375
 376         default:
 377                 printk(KERN_WARNING "Invalid LRH.link_next_header %d\n",
 378                        header->lrh.link_next_header);
 379                 return -EINVAL;
 380         }
 381
 382         ib_unpack(bth_table, ARRAY_SIZE(bth_table),
 383                   buf, &header->bth);
 384         buf += IB_BTH_BYTES;
 385
 386         switch (header->bth.opcode) {
 387         case IB_OPCODE_UD_SEND_ONLY:
 388                 header->immediate_present = 0;
 389                 break;
 390         case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
 391                 header->immediate_present = 1;
 392                 break;
 393         default:
 394                 printk(KERN_WARNING "Invalid BTH.opcode 0x%02x\n",
 395                        header->bth.opcode);
 396                 return -EINVAL;
 397         }
 398
 399         if (header->bth.transport_header_version != 0) {
 400                 printk(KERN_WARNING "Invalid BTH.transport_header_version %d\n",
 401                        header->bth.transport_header_version);
 402                 return -EINVAL;
 403         }
 404
 405         ib_unpack(deth_table, ARRAY_SIZE(deth_table),
 406                   buf, &header->deth);
 407         buf += IB_DETH_BYTES;
 408
 409         if (header->immediate_present)
 410                 memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
 411
 412         return 0;
 413 }
 414 EXPORT_SYMBOL(ib_ud_header_unpack);