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