LXR linux/drivers/infiniband/core/ud

   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#include <linux/ip.h>
  39
  40#include <rdma/ib_pack.h>
  41
  42#define STRUCT_FIELD(header, field) \
  43        .struct_offset_bytes = offsetof(struct ib_unpacked_ ## header, field),      \
  44        .struct_size_bytes   = sizeof_field(struct ib_unpacked_ ## header, field), \
  45        .field_name          = #header ":" #field
  46
  47static const struct ib_field lrh_table[]  = {
  48        { STRUCT_FIELD(lrh, virtual_lane),
  49          .offset_words = 0,
  50          .offset_bits  = 0,
  51          .size_bits    = 4 },
  52        { STRUCT_FIELD(lrh, link_version),
  53          .offset_words = 0,
  54          .offset_bits  = 4,
  55          .size_bits    = 4 },
  56        { STRUCT_FIELD(lrh, service_level),
  57          .offset_words = 0,
  58          .offset_bits  = 8,
  59          .size_bits    = 4 },
  60        { RESERVED,
  61          .offset_words = 0,
  62          .offset_bits  = 12,
  63          .size_bits    = 2 },
  64        { STRUCT_FIELD(lrh, link_next_header),
  65          .offset_words = 0,
  66          .offset_bits  = 14,
  67          .size_bits    = 2 },
  68        { STRUCT_FIELD(lrh, destination_lid),
  69          .offset_words = 0,
  70          .offset_bits  = 16,
  71          .size_bits    = 16 },
  72        { RESERVED,
  73          .offset_words = 1,
  74          .offset_bits  = 0,
  75          .size_bits    = 5 },
  76        { STRUCT_FIELD(lrh, packet_length),
  77          .offset_words = 1,
  78          .offset_bits  = 5,
  79          .size_bits    = 11 },
  80        { STRUCT_FIELD(lrh, source_lid),
  81          .offset_words = 1,
  82          .offset_bits  = 16,
  83          .size_bits    = 16 }
  84};
  85
  86static const struct ib_field eth_table[]  = {
  87        { STRUCT_FIELD(eth, dmac_h),
  88          .offset_words = 0,
  89          .offset_bits  = 0,
  90          .size_bits    = 32 },
  91        { STRUCT_FIELD(eth, dmac_l),
  92          .offset_words = 1,
  93          .offset_bits  = 0,
  94          .size_bits    = 16 },
  95        { STRUCT_FIELD(eth, smac_h),
  96          .offset_words = 1,
  97          .offset_bits  = 16,
  98          .size_bits    = 16 },
  99        { STRUCT_FIELD(eth, smac_l),
 100          .offset_words = 2,
 101          .offset_bits  = 0,
 102          .size_bits    = 32 },
 103        { STRUCT_FIELD(eth, type),
 104          .offset_words = 3,
 105          .offset_bits  = 0,
 106          .size_bits    = 16 }
 107};
 108
 109static const struct ib_field vlan_table[]  = {
 110        { STRUCT_FIELD(vlan, tag),
 111          .offset_words = 0,
 112          .offset_bits  = 0,
 113          .size_bits    = 16 },
 114        { STRUCT_FIELD(vlan, type),
 115          .offset_words = 0,
 116          .offset_bits  = 16,
 117          .size_bits    = 16 }
 118};
 119
 120static const struct ib_field ip4_table[]  = {
 121        { STRUCT_FIELD(ip4, ver),
 122          .offset_words = 0,
 123          .offset_bits  = 0,
 124          .size_bits    = 4 },
 125        { STRUCT_FIELD(ip4, hdr_len),
 126          .offset_words = 0,
 127          .offset_bits  = 4,
 128          .size_bits    = 4 },
 129        { STRUCT_FIELD(ip4, tos),
 130          .offset_words = 0,
 131          .offset_bits  = 8,
 132          .size_bits    = 8 },
 133        { STRUCT_FIELD(ip4, tot_len),
 134          .offset_words = 0,
 135          .offset_bits  = 16,
 136          .size_bits    = 16 },
 137        { STRUCT_FIELD(ip4, id),
 138          .offset_words = 1,
 139          .offset_bits  = 0,
 140          .size_bits    = 16 },
 141        { STRUCT_FIELD(ip4, frag_off),
 142          .offset_words = 1,
 143          .offset_bits  = 16,
 144          .size_bits    = 16 },
 145        { STRUCT_FIELD(ip4, ttl),
 146          .offset_words = 2,
 147          .offset_bits  = 0,
 148          .size_bits    = 8 },
 149        { STRUCT_FIELD(ip4, protocol),
 150          .offset_words = 2,
 151          .offset_bits  = 8,
 152          .size_bits    = 8 },
 153        { STRUCT_FIELD(ip4, check),
 154          .offset_words = 2,
 155          .offset_bits  = 16,
 156          .size_bits    = 16 },
 157        { STRUCT_FIELD(ip4, saddr),
 158          .offset_words = 3,
 159          .offset_bits  = 0,
 160          .size_bits    = 32 },
 161        { STRUCT_FIELD(ip4, daddr),
 162          .offset_words = 4,
 163          .offset_bits  = 0,
 164          .size_bits    = 32 }
 165};
 166
 167static const struct ib_field udp_table[]  = {
 168        { STRUCT_FIELD(udp, sport),
 169          .offset_words = 0,
 170          .offset_bits  = 0,
 171          .size_bits    = 16 },
 172        { STRUCT_FIELD(udp, dport),
 173          .offset_words = 0,
 174          .offset_bits  = 16,
 175          .size_bits    = 16 },
 176        { STRUCT_FIELD(udp, length),
 177          .offset_words = 1,
 178          .offset_bits  = 0,
 179          .size_bits    = 16 },
 180        { STRUCT_FIELD(udp, csum),
 181          .offset_words = 1,
 182          .offset_bits  = 16,
 183          .size_bits    = 16 }
 184};
 185
 186static const struct ib_field grh_table[]  = {
 187        { STRUCT_FIELD(grh, ip_version),
 188          .offset_words = 0,
 189          .offset_bits  = 0,
 190          .size_bits    = 4 },
 191        { STRUCT_FIELD(grh, traffic_class),
 192          .offset_words = 0,
 193          .offset_bits  = 4,
 194          .size_bits    = 8 },
 195        { STRUCT_FIELD(grh, flow_label),
 196          .offset_words = 0,
 197          .offset_bits  = 12,
 198          .size_bits    = 20 },
 199        { STRUCT_FIELD(grh, payload_length),
 200          .offset_words = 1,
 201          .offset_bits  = 0,
 202          .size_bits    = 16 },
 203        { STRUCT_FIELD(grh, next_header),
 204          .offset_words = 1,
 205          .offset_bits  = 16,
 206          .size_bits    = 8 },
 207        { STRUCT_FIELD(grh, hop_limit),
 208          .offset_words = 1,
 209          .offset_bits  = 24,
 210          .size_bits    = 8 },
 211        { STRUCT_FIELD(grh, source_gid),
 212          .offset_words = 2,
 213          .offset_bits  = 0,
 214          .size_bits    = 128 },
 215        { STRUCT_FIELD(grh, destination_gid),
 216          .offset_words = 6,
 217          .offset_bits  = 0,
 218          .size_bits    = 128 }
 219};
 220
 221static const struct ib_field bth_table[]  = {
 222        { STRUCT_FIELD(bth, opcode),
 223          .offset_words = 0,
 224          .offset_bits  = 0,
 225          .size_bits    = 8 },
 226        { STRUCT_FIELD(bth, solicited_event),
 227          .offset_words = 0,
 228          .offset_bits  = 8,
 229          .size_bits    = 1 },
 230        { STRUCT_FIELD(bth, mig_req),
 231          .offset_words = 0,
 232          .offset_bits  = 9,
 233          .size_bits    = 1 },
 234        { STRUCT_FIELD(bth, pad_count),
 235          .offset_words = 0,
 236          .offset_bits  = 10,
 237          .size_bits    = 2 },
 238        { STRUCT_FIELD(bth, transport_header_version),
 239          .offset_words = 0,
 240          .offset_bits  = 12,
 241          .size_bits    = 4 },
 242        { STRUCT_FIELD(bth, pkey),
 243          .offset_words = 0,
 244          .offset_bits  = 16,
 245          .size_bits    = 16 },
 246        { RESERVED,
 247          .offset_words = 1,
 248          .offset_bits  = 0,
 249          .size_bits    = 8 },
 250        { STRUCT_FIELD(bth, destination_qpn),
 251          .offset_words = 1,
 252          .offset_bits  = 8,
 253          .size_bits    = 24 },
 254        { STRUCT_FIELD(bth, ack_req),
 255          .offset_words = 2,
 256          .offset_bits  = 0,
 257          .size_bits    = 1 },
 258        { RESERVED,
 259          .offset_words = 2,
 260          .offset_bits  = 1,
 261          .size_bits    = 7 },
 262        { STRUCT_FIELD(bth, psn),
 263          .offset_words = 2,
 264          .offset_bits  = 8,
 265          .size_bits    = 24 }
 266};
 267
 268static const struct ib_field deth_table[] = {
 269        { STRUCT_FIELD(deth, qkey),
 270          .offset_words = 0,
 271          .offset_bits  = 0,
 272          .size_bits    = 32 },
 273        { RESERVED,
 274          .offset_words = 1,
 275          .offset_bits  = 0,
 276          .size_bits    = 8 },
 277        { STRUCT_FIELD(deth, source_qpn),
 278          .offset_words = 1,
 279          .offset_bits  = 8,
 280          .size_bits    = 24 }
 281};
 282
 283__sum16 ib_ud_ip4_csum(struct ib_ud_header *header)
 284{
 285        struct iphdr iph;
 286
 287        iph.ihl         = 5;
 288        iph.version     = 4;
 289        iph.tos         = header->ip4.tos;
 290        iph.tot_len     = header->ip4.tot_len;
 291        iph.id          = header->ip4.id;
 292        iph.frag_off    = header->ip4.frag_off;
 293        iph.ttl         = header->ip4.ttl;
 294        iph.protocol    = header->ip4.protocol;
 295        iph.check       = 0;
 296        iph.saddr       = header->ip4.saddr;
 297        iph.daddr       = header->ip4.daddr;
 298
 299        return ip_fast_csum((u8 *)&iph, iph.ihl);
 300}
 301EXPORT_SYMBOL(ib_ud_ip4_csum);
 302
 303/**
 304 * ib_ud_header_init - Initialize UD header structure
 305 * @payload_bytes:Length of packet payload
 306 * @lrh_present: specify if LRH is present
 307 * @eth_present: specify if Eth header is present
 308 * @vlan_present: packet is tagged vlan
 309 * @grh_present: GRH flag (if non-zero, GRH will be included)
 310 * @ip_version: if non-zero, IP header, V4 or V6, will be included
 311 * @udp_present :if non-zero, UDP header will be included
 312 * @immediate_present: specify if immediate data is present
 313 * @header:Structure to initialize
 314 */
 315int ib_ud_header_init(int     payload_bytes,
 316                      int    lrh_present,
 317                      int    eth_present,
 318                      int    vlan_present,
 319                      int    grh_present,
 320                      int    ip_version,
 321                      int    udp_present,
 322                      int    immediate_present,
 323                      struct ib_ud_header *header)
 324{
 325        size_t udp_bytes = udp_present ? IB_UDP_BYTES : 0;
 326
 327        grh_present = grh_present && !ip_version;
 328        memset(header, 0, sizeof *header);
 329
 330        /*
 331         * UDP header without IP header doesn't make sense
 332         */
 333        if (udp_present && ip_version != 4 && ip_version != 6)
 334                return -EINVAL;
 335
 336        if (lrh_present) {
 337                u16 packet_length;
 338
 339                header->lrh.link_version     = 0;
 340                header->lrh.link_next_header =
 341                        grh_present ? IB_LNH_IBA_GLOBAL : IB_LNH_IBA_LOCAL;
 342                packet_length = (IB_LRH_BYTES   +
 343                                 IB_BTH_BYTES   +
 344                                 IB_DETH_BYTES  +
 345                                 (grh_present ? IB_GRH_BYTES : 0) +
 346                                 payload_bytes  +
 347                                 4              + /* ICRC     */
 348                                 3) / 4;          /* round up */
 349                header->lrh.packet_length = cpu_to_be16(packet_length);
 350        }
 351
 352        if (vlan_present)
 353                header->eth.type = cpu_to_be16(ETH_P_8021Q);
 354
 355        if (ip_version == 6 || grh_present) {
 356                header->grh.ip_version      = 6;
 357                header->grh.payload_length  =
 358                        cpu_to_be16((udp_bytes        +
 359                                     IB_BTH_BYTES     +
 360                                     IB_DETH_BYTES    +
 361                                     payload_bytes    +
 362                                     4                + /* ICRC     */
 363                                     3) & ~3);          /* round up */
 364                header->grh.next_header     = udp_present ? IPPROTO_UDP : 0x1b;
 365        }
 366
 367        if (ip_version == 4) {
 368                header->ip4.ver = 4; /* version 4 */
 369                header->ip4.hdr_len = 5; /* 5 words */
 370                header->ip4.tot_len =
 371                        cpu_to_be16(IB_IP4_BYTES   +
 372                                     udp_bytes     +
 373                                     IB_BTH_BYTES  +
 374                                     IB_DETH_BYTES +
 375                                     payload_bytes +
 376                                     4);     /* ICRC     */
 377                header->ip4.protocol = IPPROTO_UDP;
 378        }
 379        if (udp_present && ip_version)
 380                header->udp.length =
 381                        cpu_to_be16(IB_UDP_BYTES   +
 382                                     IB_BTH_BYTES  +
 383                                     IB_DETH_BYTES +
 384                                     payload_bytes +
 385                                     4);     /* ICRC     */
 386
 387        if (immediate_present)
 388                header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
 389        else
 390                header->bth.opcode           = IB_OPCODE_UD_SEND_ONLY;
 391        header->bth.pad_count                = (4 - payload_bytes) & 3;
 392        header->bth.transport_header_version = 0;
 393
 394        header->lrh_present = lrh_present;
 395        header->eth_present = eth_present;
 396        header->vlan_present = vlan_present;
 397        header->grh_present = grh_present || (ip_version == 6);
 398        header->ipv4_present = ip_version == 4;
 399        header->udp_present = udp_present;
 400        header->immediate_present = immediate_present;
 401        return 0;
 402}
 403EXPORT_SYMBOL(ib_ud_header_init);
 404
 405/**
 406 * ib_ud_header_pack - Pack UD header struct into wire format
 407 * @header:UD header struct
 408 * @buf:Buffer to pack into
 409 *
 410 * ib_ud_header_pack() packs the UD header structure @header into wire
 411 * format in the buffer @buf.
 412 */
 413int ib_ud_header_pack(struct ib_ud_header *header,
 414                      void                *buf)
 415{
 416        int len = 0;
 417
 418        if (header->lrh_present) {
 419                ib_pack(lrh_table, ARRAY_SIZE(lrh_table),
 420                        &header->lrh, buf + len);
 421                len += IB_LRH_BYTES;
 422        }
 423        if (header->eth_present) {
 424                ib_pack(eth_table, ARRAY_SIZE(eth_table),
 425                        &header->eth, buf + len);
 426                len += IB_ETH_BYTES;
 427        }
 428        if (header->vlan_present) {
 429                ib_pack(vlan_table, ARRAY_SIZE(vlan_table),
 430                        &header->vlan, buf + len);
 431                len += IB_VLAN_BYTES;
 432        }
 433        if (header->grh_present) {
 434                ib_pack(grh_table, ARRAY_SIZE(grh_table),
 435                        &header->grh, buf + len);
 436                len += IB_GRH_BYTES;
 437        }
 438        if (header->ipv4_present) {
 439                ib_pack(ip4_table, ARRAY_SIZE(ip4_table),
 440                        &header->ip4, buf + len);
 441                len += IB_IP4_BYTES;
 442        }
 443        if (header->udp_present) {
 444                ib_pack(udp_table, ARRAY_SIZE(udp_table),
 445                        &header->udp, buf + len);
 446                len += IB_UDP_BYTES;
 447        }
 448
 449        ib_pack(bth_table, ARRAY_SIZE(bth_table),
 450                &header->bth, buf + len);
 451        len += IB_BTH_BYTES;
 452
 453        ib_pack(deth_table, ARRAY_SIZE(deth_table),
 454                &header->deth, buf + len);
 455        len += IB_DETH_BYTES;
 456
 457        if (header->immediate_present) {
 458                memcpy(buf + len, &header->immediate_data, sizeof header->immediate_data);
 459                len += sizeof header->immediate_data;
 460        }
 461
 462        return len;
 463}
 464EXPORT_SYMBOL(ib_ud_header_pack);
 465
 466/**
 467 * ib_ud_header_unpack - Unpack UD header struct from wire format
 468 * @header:UD header struct
 469 * @buf:Buffer to pack into
 470 *
 471 * ib_ud_header_pack() unpacks the UD header structure @header from wire
 472 * format in the buffer @buf.
 473 */
 474int ib_ud_header_unpack(void                *buf,
 475                        struct ib_ud_header *header)
 476{
 477        ib_unpack(lrh_table, ARRAY_SIZE(lrh_table),
 478                  buf, &header->lrh);
 479        buf += IB_LRH_BYTES;
 480
 481        if (header->lrh.link_version != 0) {
 482                pr_warn("Invalid LRH.link_version %d\n",
 483                        header->lrh.link_version);
 484                return -EINVAL;
 485        }
 486
 487        switch (header->lrh.link_next_header) {
 488        case IB_LNH_IBA_LOCAL:
 489                header->grh_present = 0;
 490                break;
 491
 492        case IB_LNH_IBA_GLOBAL:
 493                header->grh_present = 1;
 494                ib_unpack(grh_table, ARRAY_SIZE(grh_table),
 495                          buf, &header->grh);
 496                buf += IB_GRH_BYTES;
 497
 498                if (header->grh.ip_version != 6) {
 499                        pr_warn("Invalid GRH.ip_version %d\n",
 500                                header->grh.ip_version);
 501                        return -EINVAL;
 502                }
 503                if (header->grh.next_header != 0x1b) {
 504                        pr_warn("Invalid GRH.next_header 0x%02x\n",
 505                                header->grh.next_header);
 506                        return -EINVAL;
 507                }
 508                break;
 509
 510        default:
 511                pr_warn("Invalid LRH.link_next_header %d\n",
 512                        header->lrh.link_next_header);
 513                return -EINVAL;
 514        }
 515
 516        ib_unpack(bth_table, ARRAY_SIZE(bth_table),
 517                  buf, &header->bth);
 518        buf += IB_BTH_BYTES;
 519
 520        switch (header->bth.opcode) {
 521        case IB_OPCODE_UD_SEND_ONLY:
 522                header->immediate_present = 0;
 523                break;
 524        case IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE:
 525                header->immediate_present = 1;
 526                break;
 527        default:
 528                pr_warn("Invalid BTH.opcode 0x%02x\n", header->bth.opcode);
 529                return -EINVAL;
 530        }
 531
 532        if (header->bth.transport_header_version != 0) {
 533                pr_warn("Invalid BTH.transport_header_version %d\n",
 534                        header->bth.transport_header_version);
 535                return -EINVAL;
 536        }
 537
 538        ib_unpack(deth_table, ARRAY_SIZE(deth_table),
 539                  buf, &header->deth);
 540        buf += IB_DETH_BYTES;
 541
 542        if (header->immediate_present)
 543                memcpy(&header->immediate_data, buf, sizeof header->immediate_data);
 544
 545        return 0;
 546}
 547EXPORT_SYMBOL(ib_ud_header_unpack);
 548