linux/drivers/target/target_core_spc.c
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   1/*
   2 * SCSI Primary Commands (SPC) parsing and emulation.
   3 *
   4 * (c) Copyright 2002-2012 RisingTide Systems LLC.
   5 *
   6 * Nicholas A. Bellinger <nab@kernel.org>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21 */
  22
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <asm/unaligned.h>
  26
  27#include <scsi/scsi.h>
  28#include <scsi/scsi_tcq.h>
  29
  30#include <target/target_core_base.h>
  31#include <target/target_core_backend.h>
  32#include <target/target_core_fabric.h>
  33
  34#include "target_core_internal.h"
  35#include "target_core_alua.h"
  36#include "target_core_pr.h"
  37#include "target_core_ua.h"
  38
  39
  40static void spc_fill_alua_data(struct se_port *port, unsigned char *buf)
  41{
  42        struct t10_alua_tg_pt_gp *tg_pt_gp;
  43        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
  44
  45        /*
  46         * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
  47         */
  48        buf[5]  = 0x80;
  49
  50        /*
  51         * Set TPGS field for explict and/or implict ALUA access type
  52         * and opteration.
  53         *
  54         * See spc4r17 section 6.4.2 Table 135
  55         */
  56        if (!port)
  57                return;
  58        tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
  59        if (!tg_pt_gp_mem)
  60                return;
  61
  62        spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  63        tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
  64        if (tg_pt_gp)
  65                buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  66        spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
  67}
  68
  69static sense_reason_t
  70spc_emulate_inquiry_std(struct se_cmd *cmd, char *buf)
  71{
  72        struct se_lun *lun = cmd->se_lun;
  73        struct se_device *dev = cmd->se_dev;
  74
  75        /* Set RMB (removable media) for tape devices */
  76        if (dev->transport->get_device_type(dev) == TYPE_TAPE)
  77                buf[1] = 0x80;
  78
  79        buf[2] = 0x05; /* SPC-3 */
  80
  81        /*
  82         * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
  83         *
  84         * SPC4 says:
  85         *   A RESPONSE DATA FORMAT field set to 2h indicates that the
  86         *   standard INQUIRY data is in the format defined in this
  87         *   standard. Response data format values less than 2h are
  88         *   obsolete. Response data format values greater than 2h are
  89         *   reserved.
  90         */
  91        buf[3] = 2;
  92
  93        /*
  94         * Enable SCCS and TPGS fields for Emulated ALUA
  95         */
  96        spc_fill_alua_data(lun->lun_sep, buf);
  97
  98        buf[7] = 0x2; /* CmdQue=1 */
  99
 100        snprintf(&buf[8], 8, "LIO-ORG");
 101        snprintf(&buf[16], 16, "%s", dev->t10_wwn.model);
 102        snprintf(&buf[32], 4, "%s", dev->t10_wwn.revision);
 103        buf[4] = 31; /* Set additional length to 31 */
 104
 105        return 0;
 106}
 107
 108/* unit serial number */
 109static sense_reason_t
 110spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 111{
 112        struct se_device *dev = cmd->se_dev;
 113        u16 len = 0;
 114
 115        if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 116                u32 unit_serial_len;
 117
 118                unit_serial_len = strlen(dev->t10_wwn.unit_serial);
 119                unit_serial_len++; /* For NULL Terminator */
 120
 121                len += sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
 122                len++; /* Extra Byte for NULL Terminator */
 123                buf[3] = len;
 124        }
 125        return 0;
 126}
 127
 128static void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
 129                unsigned char *buf)
 130{
 131        unsigned char *p = &dev->t10_wwn.unit_serial[0];
 132        int cnt;
 133        bool next = true;
 134
 135        /*
 136         * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 137         * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
 138         * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
 139         * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
 140         * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 141         * per device uniqeness.
 142         */
 143        for (cnt = 0; *p && cnt < 13; p++) {
 144                int val = hex_to_bin(*p);
 145
 146                if (val < 0)
 147                        continue;
 148
 149                if (next) {
 150                        next = false;
 151                        buf[cnt++] |= val;
 152                } else {
 153                        next = true;
 154                        buf[cnt] = val << 4;
 155                }
 156        }
 157}
 158
 159/*
 160 * Device identification VPD, for a complete list of
 161 * DESIGNATOR TYPEs see spc4r17 Table 459.
 162 */
 163static sense_reason_t
 164spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 165{
 166        struct se_device *dev = cmd->se_dev;
 167        struct se_lun *lun = cmd->se_lun;
 168        struct se_port *port = NULL;
 169        struct se_portal_group *tpg = NULL;
 170        struct t10_alua_lu_gp_member *lu_gp_mem;
 171        struct t10_alua_tg_pt_gp *tg_pt_gp;
 172        struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
 173        unsigned char *prod = &dev->t10_wwn.model[0];
 174        u32 prod_len;
 175        u32 unit_serial_len, off = 0;
 176        u16 len = 0, id_len;
 177
 178        off = 4;
 179
 180        /*
 181         * NAA IEEE Registered Extended Assigned designator format, see
 182         * spc4r17 section 7.7.3.6.5
 183         *
 184         * We depend upon a target_core_mod/ConfigFS provided
 185         * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 186         * value in order to return the NAA id.
 187         */
 188        if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
 189                goto check_t10_vend_desc;
 190
 191        /* CODE SET == Binary */
 192        buf[off++] = 0x1;
 193
 194        /* Set ASSOCIATION == addressed logical unit: 0)b */
 195        buf[off] = 0x00;
 196
 197        /* Identifier/Designator type == NAA identifier */
 198        buf[off++] |= 0x3;
 199        off++;
 200
 201        /* Identifier/Designator length */
 202        buf[off++] = 0x10;
 203
 204        /*
 205         * Start NAA IEEE Registered Extended Identifier/Designator
 206         */
 207        buf[off++] = (0x6 << 4);
 208
 209        /*
 210         * Use OpenFabrics IEEE Company ID: 00 14 05
 211         */
 212        buf[off++] = 0x01;
 213        buf[off++] = 0x40;
 214        buf[off] = (0x5 << 4);
 215
 216        /*
 217         * Return ConfigFS Unit Serial Number information for
 218         * VENDOR_SPECIFIC_IDENTIFIER and
 219         * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
 220         */
 221        spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
 222
 223        len = 20;
 224        off = (len + 4);
 225
 226check_t10_vend_desc:
 227        /*
 228         * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 229         */
 230        id_len = 8; /* For Vendor field */
 231        prod_len = 4; /* For VPD Header */
 232        prod_len += 8; /* For Vendor field */
 233        prod_len += strlen(prod);
 234        prod_len++; /* For : */
 235
 236        if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 237                unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
 238                unit_serial_len++; /* For NULL Terminator */
 239
 240                id_len += sprintf(&buf[off+12], "%s:%s", prod,
 241                                &dev->t10_wwn.unit_serial[0]);
 242        }
 243        buf[off] = 0x2; /* ASCII */
 244        buf[off+1] = 0x1; /* T10 Vendor ID */
 245        buf[off+2] = 0x0;
 246        memcpy(&buf[off+4], "LIO-ORG", 8);
 247        /* Extra Byte for NULL Terminator */
 248        id_len++;
 249        /* Identifier Length */
 250        buf[off+3] = id_len;
 251        /* Header size for Designation descriptor */
 252        len += (id_len + 4);
 253        off += (id_len + 4);
 254        /*
 255         * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD
 256         */
 257        port = lun->lun_sep;
 258        if (port) {
 259                struct t10_alua_lu_gp *lu_gp;
 260                u32 padding, scsi_name_len;
 261                u16 lu_gp_id = 0;
 262                u16 tg_pt_gp_id = 0;
 263                u16 tpgt;
 264
 265                tpg = port->sep_tpg;
 266                /*
 267                 * Relative target port identifer, see spc4r17
 268                 * section 7.7.3.7
 269                 *
 270                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 271                 * section 7.5.1 Table 362
 272                 */
 273                buf[off] =
 274                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 275                buf[off++] |= 0x1; /* CODE SET == Binary */
 276                buf[off] = 0x80; /* Set PIV=1 */
 277                /* Set ASSOCIATION == target port: 01b */
 278                buf[off] |= 0x10;
 279                /* DESIGNATOR TYPE == Relative target port identifer */
 280                buf[off++] |= 0x4;
 281                off++; /* Skip over Reserved */
 282                buf[off++] = 4; /* DESIGNATOR LENGTH */
 283                /* Skip over Obsolete field in RTPI payload
 284                 * in Table 472 */
 285                off += 2;
 286                buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
 287                buf[off++] = (port->sep_rtpi & 0xff);
 288                len += 8; /* Header size + Designation descriptor */
 289                /*
 290                 * Target port group identifier, see spc4r17
 291                 * section 7.7.3.8
 292                 *
 293                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 294                 * section 7.5.1 Table 362
 295                 */
 296                tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
 297                if (!tg_pt_gp_mem)
 298                        goto check_lu_gp;
 299
 300                spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 301                tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
 302                if (!tg_pt_gp) {
 303                        spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 304                        goto check_lu_gp;
 305                }
 306                tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 307                spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
 308
 309                buf[off] =
 310                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 311                buf[off++] |= 0x1; /* CODE SET == Binary */
 312                buf[off] = 0x80; /* Set PIV=1 */
 313                /* Set ASSOCIATION == target port: 01b */
 314                buf[off] |= 0x10;
 315                /* DESIGNATOR TYPE == Target port group identifier */
 316                buf[off++] |= 0x5;
 317                off++; /* Skip over Reserved */
 318                buf[off++] = 4; /* DESIGNATOR LENGTH */
 319                off += 2; /* Skip over Reserved Field */
 320                buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
 321                buf[off++] = (tg_pt_gp_id & 0xff);
 322                len += 8; /* Header size + Designation descriptor */
 323                /*
 324                 * Logical Unit Group identifier, see spc4r17
 325                 * section 7.7.3.8
 326                 */
 327check_lu_gp:
 328                lu_gp_mem = dev->dev_alua_lu_gp_mem;
 329                if (!lu_gp_mem)
 330                        goto check_scsi_name;
 331
 332                spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 333                lu_gp = lu_gp_mem->lu_gp;
 334                if (!lu_gp) {
 335                        spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 336                        goto check_scsi_name;
 337                }
 338                lu_gp_id = lu_gp->lu_gp_id;
 339                spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 340
 341                buf[off++] |= 0x1; /* CODE SET == Binary */
 342                /* DESIGNATOR TYPE == Logical Unit Group identifier */
 343                buf[off++] |= 0x6;
 344                off++; /* Skip over Reserved */
 345                buf[off++] = 4; /* DESIGNATOR LENGTH */
 346                off += 2; /* Skip over Reserved Field */
 347                buf[off++] = ((lu_gp_id >> 8) & 0xff);
 348                buf[off++] = (lu_gp_id & 0xff);
 349                len += 8; /* Header size + Designation descriptor */
 350                /*
 351                 * SCSI name string designator, see spc4r17
 352                 * section 7.7.3.11
 353                 *
 354                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 355                 * section 7.5.1 Table 362
 356                 */
 357check_scsi_name:
 358                scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 359                /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */
 360                scsi_name_len += 10;
 361                /* Check for 4-byte padding */
 362                padding = ((-scsi_name_len) & 3);
 363                if (padding != 0)
 364                        scsi_name_len += padding;
 365                /* Header size + Designation descriptor */
 366                scsi_name_len += 4;
 367
 368                buf[off] =
 369                        (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
 370                buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 371                buf[off] = 0x80; /* Set PIV=1 */
 372                /* Set ASSOCIATION == target port: 01b */
 373                buf[off] |= 0x10;
 374                /* DESIGNATOR TYPE == SCSI name string */
 375                buf[off++] |= 0x8;
 376                off += 2; /* Skip over Reserved and length */
 377                /*
 378                 * SCSI name string identifer containing, $FABRIC_MOD
 379                 * dependent information.  For LIO-Target and iSCSI
 380                 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 381                 * UTF-8 encoding.
 382                 */
 383                tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 384                scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 385                                        tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 386                scsi_name_len += 1 /* Include  NULL terminator */;
 387                /*
 388                 * The null-terminated, null-padded (see 4.4.2) SCSI
 389                 * NAME STRING field contains a UTF-8 format string.
 390                 * The number of bytes in the SCSI NAME STRING field
 391                 * (i.e., the value in the DESIGNATOR LENGTH field)
 392                 * shall be no larger than 256 and shall be a multiple
 393                 * of four.
 394                 */
 395                if (padding)
 396                        scsi_name_len += padding;
 397
 398                buf[off-1] = scsi_name_len;
 399                off += scsi_name_len;
 400                /* Header size + Designation descriptor */
 401                len += (scsi_name_len + 4);
 402        }
 403        buf[2] = ((len >> 8) & 0xff);
 404        buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
 405        return 0;
 406}
 407
 408/* Extended INQUIRY Data VPD Page */
 409static sense_reason_t
 410spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 411{
 412        buf[3] = 0x3c;
 413        /* Set HEADSUP, ORDSUP, SIMPSUP */
 414        buf[5] = 0x07;
 415
 416        /* If WriteCache emulation is enabled, set V_SUP */
 417        if (cmd->se_dev->dev_attrib.emulate_write_cache > 0)
 418                buf[6] = 0x01;
 419        return 0;
 420}
 421
 422/* Block Limits VPD page */
 423static sense_reason_t
 424spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 425{
 426        struct se_device *dev = cmd->se_dev;
 427        u32 max_sectors;
 428        int have_tp = 0;
 429
 430        /*
 431         * Following spc3r22 section 6.5.3 Block Limits VPD page, when
 432         * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 433         * different page length for Thin Provisioning.
 434         */
 435        if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 436                have_tp = 1;
 437
 438        buf[0] = dev->transport->get_device_type(dev);
 439        buf[3] = have_tp ? 0x3c : 0x10;
 440
 441        /* Set WSNZ to 1 */
 442        buf[4] = 0x01;
 443
 444        /*
 445         * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 446         */
 447        put_unaligned_be16(1, &buf[6]);
 448
 449        /*
 450         * Set MAXIMUM TRANSFER LENGTH
 451         */
 452        max_sectors = min(dev->dev_attrib.fabric_max_sectors,
 453                          dev->dev_attrib.hw_max_sectors);
 454        put_unaligned_be32(max_sectors, &buf[8]);
 455
 456        /*
 457         * Set OPTIMAL TRANSFER LENGTH
 458         */
 459        put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
 460
 461        /*
 462         * Exit now if we don't support TP.
 463         */
 464        if (!have_tp)
 465                goto max_write_same;
 466
 467        /*
 468         * Set MAXIMUM UNMAP LBA COUNT
 469         */
 470        put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
 471
 472        /*
 473         * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 474         */
 475        put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
 476                           &buf[24]);
 477
 478        /*
 479         * Set OPTIMAL UNMAP GRANULARITY
 480         */
 481        put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
 482
 483        /*
 484         * UNMAP GRANULARITY ALIGNMENT
 485         */
 486        put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
 487                           &buf[32]);
 488        if (dev->dev_attrib.unmap_granularity_alignment != 0)
 489                buf[32] |= 0x80; /* Set the UGAVALID bit */
 490
 491        /*
 492         * MAXIMUM WRITE SAME LENGTH
 493         */
 494max_write_same:
 495        put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
 496
 497        return 0;
 498}
 499
 500/* Block Device Characteristics VPD page */
 501static sense_reason_t
 502spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 503{
 504        struct se_device *dev = cmd->se_dev;
 505
 506        buf[0] = dev->transport->get_device_type(dev);
 507        buf[3] = 0x3c;
 508        buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
 509
 510        return 0;
 511}
 512
 513/* Thin Provisioning VPD */
 514static sense_reason_t
 515spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 516{
 517        struct se_device *dev = cmd->se_dev;
 518
 519        /*
 520         * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
 521         *
 522         * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 523         * zero, then the page length shall be set to 0004h.  If the DP bit
 524         * is set to one, then the page length shall be set to the value
 525         * defined in table 162.
 526         */
 527        buf[0] = dev->transport->get_device_type(dev);
 528
 529        /*
 530         * Set Hardcoded length mentioned above for DP=0
 531         */
 532        put_unaligned_be16(0x0004, &buf[2]);
 533
 534        /*
 535         * The THRESHOLD EXPONENT field indicates the threshold set size in
 536         * LBAs as a power of 2 (i.e., the threshold set size is equal to
 537         * 2(threshold exponent)).
 538         *
 539         * Note that this is currently set to 0x00 as mkp says it will be
 540         * changing again.  We can enable this once it has settled in T10
 541         * and is actually used by Linux/SCSI ML code.
 542         */
 543        buf[4] = 0x00;
 544
 545        /*
 546         * A TPU bit set to one indicates that the device server supports
 547         * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 548         * that the device server does not support the UNMAP command.
 549         */
 550        if (dev->dev_attrib.emulate_tpu != 0)
 551                buf[5] = 0x80;
 552
 553        /*
 554         * A TPWS bit set to one indicates that the device server supports
 555         * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 556         * A TPWS bit set to zero indicates that the device server does not
 557         * support the use of the WRITE SAME (16) command to unmap LBAs.
 558         */
 559        if (dev->dev_attrib.emulate_tpws != 0)
 560                buf[5] |= 0x40;
 561
 562        return 0;
 563}
 564
 565static sense_reason_t
 566spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 567
 568static struct {
 569        uint8_t         page;
 570        sense_reason_t  (*emulate)(struct se_cmd *, unsigned char *);
 571} evpd_handlers[] = {
 572        { .page = 0x00, .emulate = spc_emulate_evpd_00 },
 573        { .page = 0x80, .emulate = spc_emulate_evpd_80 },
 574        { .page = 0x83, .emulate = spc_emulate_evpd_83 },
 575        { .page = 0x86, .emulate = spc_emulate_evpd_86 },
 576        { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
 577        { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
 578        { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
 579};
 580
 581/* supported vital product data pages */
 582static sense_reason_t
 583spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 584{
 585        int p;
 586
 587        /*
 588         * Only report the INQUIRY EVPD=1 pages after a valid NAA
 589         * Registered Extended LUN WWN has been set via ConfigFS
 590         * during device creation/restart.
 591         */
 592        if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 593                buf[3] = ARRAY_SIZE(evpd_handlers);
 594                for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
 595                        buf[p + 4] = evpd_handlers[p].page;
 596        }
 597
 598        return 0;
 599}
 600
 601static sense_reason_t
 602spc_emulate_inquiry(struct se_cmd *cmd)
 603{
 604        struct se_device *dev = cmd->se_dev;
 605        struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
 606        unsigned char *rbuf;
 607        unsigned char *cdb = cmd->t_task_cdb;
 608        unsigned char buf[SE_INQUIRY_BUF];
 609        sense_reason_t ret;
 610        int p;
 611
 612        memset(buf, 0, SE_INQUIRY_BUF);
 613
 614        if (dev == tpg->tpg_virt_lun0.lun_se_dev)
 615                buf[0] = 0x3f; /* Not connected */
 616        else
 617                buf[0] = dev->transport->get_device_type(dev);
 618
 619        if (!(cdb[1] & 0x1)) {
 620                if (cdb[2]) {
 621                        pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
 622                               cdb[2]);
 623                        ret = TCM_INVALID_CDB_FIELD;
 624                        goto out;
 625                }
 626
 627                ret = spc_emulate_inquiry_std(cmd, buf);
 628                goto out;
 629        }
 630
 631        for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
 632                if (cdb[2] == evpd_handlers[p].page) {
 633                        buf[1] = cdb[2];
 634                        ret = evpd_handlers[p].emulate(cmd, buf);
 635                        goto out;
 636                }
 637        }
 638
 639        pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
 640        ret = TCM_INVALID_CDB_FIELD;
 641
 642out:
 643        rbuf = transport_kmap_data_sg(cmd);
 644        if (rbuf) {
 645                memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 646                transport_kunmap_data_sg(cmd);
 647        }
 648
 649        if (!ret)
 650                target_complete_cmd(cmd, GOOD);
 651        return ret;
 652}
 653
 654static int spc_modesense_rwrecovery(struct se_device *dev, u8 pc, u8 *p)
 655{
 656        p[0] = 0x01;
 657        p[1] = 0x0a;
 658
 659        /* No changeable values for now */
 660        if (pc == 1)
 661                goto out;
 662
 663out:
 664        return 12;
 665}
 666
 667static int spc_modesense_control(struct se_device *dev, u8 pc, u8 *p)
 668{
 669        p[0] = 0x0a;
 670        p[1] = 0x0a;
 671
 672        /* No changeable values for now */
 673        if (pc == 1)
 674                goto out;
 675
 676        p[2] = 2;
 677        /*
 678         * From spc4r23, 7.4.7 Control mode page
 679         *
 680         * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
 681         * restrictions on the algorithm used for reordering commands
 682         * having the SIMPLE task attribute (see SAM-4).
 683         *
 684         *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
 685         *                         Code      Description
 686         *                          0h       Restricted reordering
 687         *                          1h       Unrestricted reordering allowed
 688         *                          2h to 7h    Reserved
 689         *                          8h to Fh    Vendor specific
 690         *
 691         * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
 692         * the device server shall order the processing sequence of commands
 693         * having the SIMPLE task attribute such that data integrity is maintained
 694         * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
 695         * requests is halted at any time, the final value of all data observable
 696         * on the medium shall be the same as if all the commands had been processed
 697         * with the ORDERED task attribute).
 698         *
 699         * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
 700         * device server may reorder the processing sequence of commands having the
 701         * SIMPLE task attribute in any manner. Any data integrity exposures related to
 702         * command sequence order shall be explicitly handled by the application client
 703         * through the selection of appropriate ommands and task attributes.
 704         */
 705        p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
 706        /*
 707         * From spc4r17, section 7.4.6 Control mode Page
 708         *
 709         * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 710         *
 711         * 00b: The logical unit shall clear any unit attention condition
 712         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 713         * status and shall not establish a unit attention condition when a com-
 714         * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 715         * status.
 716         *
 717         * 10b: The logical unit shall not clear any unit attention condition
 718         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 719         * status and shall not establish a unit attention condition when
 720         * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 721         * CONFLICT status.
 722         *
 723         * 11b a The logical unit shall not clear any unit attention condition
 724         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 725         * status and shall establish a unit attention condition for the
 726         * initiator port associated with the I_T nexus on which the BUSY,
 727         * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 728         * Depending on the status, the additional sense code shall be set to
 729         * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 730         * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 731         * command, a unit attention condition shall be established only once
 732         * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 733         * to the number of commands completed with one of those status codes.
 734         */
 735        p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
 736               (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
 737        /*
 738         * From spc4r17, section 7.4.6 Control mode Page
 739         *
 740         * Task Aborted Status (TAS) bit set to zero.
 741         *
 742         * A task aborted status (TAS) bit set to zero specifies that aborted
 743         * tasks shall be terminated by the device server without any response
 744         * to the application client. A TAS bit set to one specifies that tasks
 745         * aborted by the actions of an I_T nexus other than the I_T nexus on
 746         * which the command was received shall be completed with TASK ABORTED
 747         * status (see SAM-4).
 748         */
 749        p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
 750        p[8] = 0xff;
 751        p[9] = 0xff;
 752        p[11] = 30;
 753
 754out:
 755        return 12;
 756}
 757
 758static int spc_modesense_caching(struct se_device *dev, u8 pc, u8 *p)
 759{
 760        p[0] = 0x08;
 761        p[1] = 0x12;
 762
 763        /* No changeable values for now */
 764        if (pc == 1)
 765                goto out;
 766
 767        if (dev->dev_attrib.emulate_write_cache > 0)
 768                p[2] = 0x04; /* Write Cache Enable */
 769        p[12] = 0x20; /* Disabled Read Ahead */
 770
 771out:
 772        return 20;
 773}
 774
 775static int spc_modesense_informational_exceptions(struct se_device *dev, u8 pc, unsigned char *p)
 776{
 777        p[0] = 0x1c;
 778        p[1] = 0x0a;
 779
 780        /* No changeable values for now */
 781        if (pc == 1)
 782                goto out;
 783
 784out:
 785        return 12;
 786}
 787
 788static struct {
 789        uint8_t         page;
 790        uint8_t         subpage;
 791        int             (*emulate)(struct se_device *, u8, unsigned char *);
 792} modesense_handlers[] = {
 793        { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
 794        { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
 795        { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
 796        { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
 797};
 798
 799static void spc_modesense_write_protect(unsigned char *buf, int type)
 800{
 801        /*
 802         * I believe that the WP bit (bit 7) in the mode header is the same for
 803         * all device types..
 804         */
 805        switch (type) {
 806        case TYPE_DISK:
 807        case TYPE_TAPE:
 808        default:
 809                buf[0] |= 0x80; /* WP bit */
 810                break;
 811        }
 812}
 813
 814static void spc_modesense_dpofua(unsigned char *buf, int type)
 815{
 816        switch (type) {
 817        case TYPE_DISK:
 818                buf[0] |= 0x10; /* DPOFUA bit */
 819                break;
 820        default:
 821                break;
 822        }
 823}
 824
 825static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 826{
 827        *buf++ = 8;
 828        put_unaligned_be32(min(blocks, 0xffffffffull), buf);
 829        buf += 4;
 830        put_unaligned_be32(block_size, buf);
 831        return 9;
 832}
 833
 834static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 835{
 836        if (blocks <= 0xffffffff)
 837                return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
 838
 839        *buf++ = 1;             /* LONGLBA */
 840        buf += 2;
 841        *buf++ = 16;
 842        put_unaligned_be64(blocks, buf);
 843        buf += 12;
 844        put_unaligned_be32(block_size, buf);
 845
 846        return 17;
 847}
 848
 849static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
 850{
 851        struct se_device *dev = cmd->se_dev;
 852        char *cdb = cmd->t_task_cdb;
 853        unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
 854        int type = dev->transport->get_device_type(dev);
 855        int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
 856        bool dbd = !!(cdb[1] & 0x08);
 857        bool llba = ten ? !!(cdb[1] & 0x10) : false;
 858        u8 pc = cdb[2] >> 6;
 859        u8 page = cdb[2] & 0x3f;
 860        u8 subpage = cdb[3];
 861        int length = 0;
 862        int ret;
 863        int i;
 864
 865        memset(buf, 0, SE_MODE_PAGE_BUF);
 866
 867        /*
 868         * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
 869         * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
 870         */
 871        length = ten ? 3 : 2;
 872
 873        /* DEVICE-SPECIFIC PARAMETER */
 874        if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) ||
 875            (cmd->se_deve &&
 876             (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY)))
 877                spc_modesense_write_protect(&buf[length], type);
 878
 879        if ((dev->dev_attrib.emulate_write_cache > 0) &&
 880            (dev->dev_attrib.emulate_fua_write > 0))
 881                spc_modesense_dpofua(&buf[length], type);
 882
 883        ++length;
 884
 885        /* BLOCK DESCRIPTOR */
 886
 887        /*
 888         * For now we only include a block descriptor for disk (SBC)
 889         * devices; other command sets use a slightly different format.
 890         */
 891        if (!dbd && type == TYPE_DISK) {
 892                u64 blocks = dev->transport->get_blocks(dev);
 893                u32 block_size = dev->dev_attrib.block_size;
 894
 895                if (ten) {
 896                        if (llba) {
 897                                length += spc_modesense_long_blockdesc(&buf[length],
 898                                                                       blocks, block_size);
 899                        } else {
 900                                length += 3;
 901                                length += spc_modesense_blockdesc(&buf[length],
 902                                                                  blocks, block_size);
 903                        }
 904                } else {
 905                        length += spc_modesense_blockdesc(&buf[length], blocks,
 906                                                          block_size);
 907                }
 908        } else {
 909                if (ten)
 910                        length += 4;
 911                else
 912                        length += 1;
 913        }
 914
 915        if (page == 0x3f) {
 916                if (subpage != 0x00 && subpage != 0xff) {
 917                        pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
 918                        return TCM_INVALID_CDB_FIELD;
 919                }
 920
 921                for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
 922                        /*
 923                         * Tricky way to say all subpage 00h for
 924                         * subpage==0, all subpages for subpage==0xff
 925                         * (and we just checked above that those are
 926                         * the only two possibilities).
 927                         */
 928                        if ((modesense_handlers[i].subpage & ~subpage) == 0) {
 929                                ret = modesense_handlers[i].emulate(dev, pc, &buf[length]);
 930                                if (!ten && length + ret >= 255)
 931                                        break;
 932                                length += ret;
 933                        }
 934                }
 935
 936                goto set_length;
 937        }
 938
 939        for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
 940                if (modesense_handlers[i].page == page &&
 941                    modesense_handlers[i].subpage == subpage) {
 942                        length += modesense_handlers[i].emulate(dev, pc, &buf[length]);
 943                        goto set_length;
 944                }
 945
 946        /*
 947         * We don't intend to implement:
 948         *  - obsolete page 03h "format parameters" (checked by Solaris)
 949         */
 950        if (page != 0x03)
 951                pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
 952                       page, subpage);
 953
 954        return TCM_UNKNOWN_MODE_PAGE;
 955
 956set_length:
 957        if (ten)
 958                put_unaligned_be16(length - 2, buf);
 959        else
 960                buf[0] = length - 1;
 961
 962        rbuf = transport_kmap_data_sg(cmd);
 963        if (rbuf) {
 964                memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
 965                transport_kunmap_data_sg(cmd);
 966        }
 967
 968        target_complete_cmd(cmd, GOOD);
 969        return 0;
 970}
 971
 972static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
 973{
 974        struct se_device *dev = cmd->se_dev;
 975        char *cdb = cmd->t_task_cdb;
 976        bool ten = cdb[0] == MODE_SELECT_10;
 977        int off = ten ? 8 : 4;
 978        bool pf = !!(cdb[1] & 0x10);
 979        u8 page, subpage;
 980        unsigned char *buf;
 981        unsigned char tbuf[SE_MODE_PAGE_BUF];
 982        int length;
 983        int ret = 0;
 984        int i;
 985
 986        buf = transport_kmap_data_sg(cmd);
 987        if (!buf)
 988                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 989
 990        if (!pf) {
 991                ret = TCM_INVALID_CDB_FIELD;
 992                goto out;
 993        }
 994
 995        page = buf[off] & 0x3f;
 996        subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
 997
 998        for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
 999                if (modesense_handlers[i].page == page &&
1000                    modesense_handlers[i].subpage == subpage) {
1001                        memset(tbuf, 0, SE_MODE_PAGE_BUF);
1002                        length = modesense_handlers[i].emulate(dev, 0, tbuf);
1003                        goto check_contents;
1004                }
1005
1006        ret = TCM_UNKNOWN_MODE_PAGE;
1007        goto out;
1008
1009check_contents:
1010        if (memcmp(buf + off, tbuf, length))
1011                ret = TCM_INVALID_PARAMETER_LIST;
1012
1013out:
1014        transport_kunmap_data_sg(cmd);
1015
1016        if (!ret)
1017                target_complete_cmd(cmd, GOOD);
1018        return ret;
1019}
1020
1021static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1022{
1023        unsigned char *cdb = cmd->t_task_cdb;
1024        unsigned char *rbuf;
1025        u8 ua_asc = 0, ua_ascq = 0;
1026        unsigned char buf[SE_SENSE_BUF];
1027
1028        memset(buf, 0, SE_SENSE_BUF);
1029
1030        if (cdb[1] & 0x01) {
1031                pr_err("REQUEST_SENSE description emulation not"
1032                        " supported\n");
1033                return TCM_INVALID_CDB_FIELD;
1034        }
1035
1036        rbuf = transport_kmap_data_sg(cmd);
1037        if (!rbuf)
1038                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1039
1040        if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) {
1041                /*
1042                 * CURRENT ERROR, UNIT ATTENTION
1043                 */
1044                buf[0] = 0x70;
1045                buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
1046
1047                /*
1048                 * The Additional Sense Code (ASC) from the UNIT ATTENTION
1049                 */
1050                buf[SPC_ASC_KEY_OFFSET] = ua_asc;
1051                buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq;
1052                buf[7] = 0x0A;
1053        } else {
1054                /*
1055                 * CURRENT ERROR, NO SENSE
1056                 */
1057                buf[0] = 0x70;
1058                buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
1059
1060                /*
1061                 * NO ADDITIONAL SENSE INFORMATION
1062                 */
1063                buf[SPC_ASC_KEY_OFFSET] = 0x00;
1064                buf[7] = 0x0A;
1065        }
1066
1067        memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1068        transport_kunmap_data_sg(cmd);
1069
1070        target_complete_cmd(cmd, GOOD);
1071        return 0;
1072}
1073
1074sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1075{
1076        struct se_dev_entry *deve;
1077        struct se_session *sess = cmd->se_sess;
1078        unsigned char *buf;
1079        u32 lun_count = 0, offset = 8, i;
1080
1081        if (cmd->data_length < 16) {
1082                pr_warn("REPORT LUNS allocation length %u too small\n",
1083                        cmd->data_length);
1084                return TCM_INVALID_CDB_FIELD;
1085        }
1086
1087        buf = transport_kmap_data_sg(cmd);
1088        if (!buf)
1089                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1090
1091        /*
1092         * If no struct se_session pointer is present, this struct se_cmd is
1093         * coming via a target_core_mod PASSTHROUGH op, and not through
1094         * a $FABRIC_MOD.  In that case, report LUN=0 only.
1095         */
1096        if (!sess) {
1097                int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
1098                lun_count = 1;
1099                goto done;
1100        }
1101
1102        spin_lock_irq(&sess->se_node_acl->device_list_lock);
1103        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1104                deve = sess->se_node_acl->device_list[i];
1105                if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
1106                        continue;
1107                /*
1108                 * We determine the correct LUN LIST LENGTH even once we
1109                 * have reached the initial allocation length.
1110                 * See SPC2-R20 7.19.
1111                 */
1112                lun_count++;
1113                if ((offset + 8) > cmd->data_length)
1114                        continue;
1115
1116                int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);
1117                offset += 8;
1118        }
1119        spin_unlock_irq(&sess->se_node_acl->device_list_lock);
1120
1121        /*
1122         * See SPC3 r07, page 159.
1123         */
1124done:
1125        lun_count *= 8;
1126        buf[0] = ((lun_count >> 24) & 0xff);
1127        buf[1] = ((lun_count >> 16) & 0xff);
1128        buf[2] = ((lun_count >> 8) & 0xff);
1129        buf[3] = (lun_count & 0xff);
1130        transport_kunmap_data_sg(cmd);
1131
1132        target_complete_cmd(cmd, GOOD);
1133        return 0;
1134}
1135EXPORT_SYMBOL(spc_emulate_report_luns);
1136
1137static sense_reason_t
1138spc_emulate_testunitready(struct se_cmd *cmd)
1139{
1140        target_complete_cmd(cmd, GOOD);
1141        return 0;
1142}
1143
1144sense_reason_t
1145spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1146{
1147        struct se_device *dev = cmd->se_dev;
1148        unsigned char *cdb = cmd->t_task_cdb;
1149
1150        switch (cdb[0]) {
1151        case MODE_SELECT:
1152                *size = cdb[4];
1153                cmd->execute_cmd = spc_emulate_modeselect;
1154                break;
1155        case MODE_SELECT_10:
1156                *size = (cdb[7] << 8) + cdb[8];
1157                cmd->execute_cmd = spc_emulate_modeselect;
1158                break;
1159        case MODE_SENSE:
1160                *size = cdb[4];
1161                cmd->execute_cmd = spc_emulate_modesense;
1162                break;
1163        case MODE_SENSE_10:
1164                *size = (cdb[7] << 8) + cdb[8];
1165                cmd->execute_cmd = spc_emulate_modesense;
1166                break;
1167        case LOG_SELECT:
1168        case LOG_SENSE:
1169                *size = (cdb[7] << 8) + cdb[8];
1170                break;
1171        case PERSISTENT_RESERVE_IN:
1172                *size = (cdb[7] << 8) + cdb[8];
1173                cmd->execute_cmd = target_scsi3_emulate_pr_in;
1174                break;
1175        case PERSISTENT_RESERVE_OUT:
1176                *size = (cdb[7] << 8) + cdb[8];
1177                cmd->execute_cmd = target_scsi3_emulate_pr_out;
1178                break;
1179        case RELEASE:
1180        case RELEASE_10:
1181                if (cdb[0] == RELEASE_10)
1182                        *size = (cdb[7] << 8) | cdb[8];
1183                else
1184                        *size = cmd->data_length;
1185
1186                cmd->execute_cmd = target_scsi2_reservation_release;
1187                break;
1188        case RESERVE:
1189        case RESERVE_10:
1190                /*
1191                 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1192                 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1193                 */
1194                if (cdb[0] == RESERVE_10)
1195                        *size = (cdb[7] << 8) | cdb[8];
1196                else
1197                        *size = cmd->data_length;
1198
1199                cmd->execute_cmd = target_scsi2_reservation_reserve;
1200                break;
1201        case REQUEST_SENSE:
1202                *size = cdb[4];
1203                cmd->execute_cmd = spc_emulate_request_sense;
1204                break;
1205        case INQUIRY:
1206                *size = (cdb[3] << 8) + cdb[4];
1207
1208                /*
1209                 * Do implict HEAD_OF_QUEUE processing for INQUIRY.
1210                 * See spc4r17 section 5.3
1211                 */
1212                cmd->sam_task_attr = MSG_HEAD_TAG;
1213                cmd->execute_cmd = spc_emulate_inquiry;
1214                break;
1215        case SECURITY_PROTOCOL_IN:
1216        case SECURITY_PROTOCOL_OUT:
1217                *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1218                break;
1219        case EXTENDED_COPY:
1220        case READ_ATTRIBUTE:
1221        case RECEIVE_COPY_RESULTS:
1222        case WRITE_ATTRIBUTE:
1223                *size = (cdb[10] << 24) | (cdb[11] << 16) |
1224                       (cdb[12] << 8) | cdb[13];
1225                break;
1226        case RECEIVE_DIAGNOSTIC:
1227        case SEND_DIAGNOSTIC:
1228                *size = (cdb[3] << 8) | cdb[4];
1229                break;
1230        case WRITE_BUFFER:
1231                *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
1232                break;
1233        case REPORT_LUNS:
1234                cmd->execute_cmd = spc_emulate_report_luns;
1235                *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1236                /*
1237                 * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
1238                 * See spc4r17 section 5.3
1239                 */
1240                cmd->sam_task_attr = MSG_HEAD_TAG;
1241                break;
1242        case TEST_UNIT_READY:
1243                cmd->execute_cmd = spc_emulate_testunitready;
1244                *size = 0;
1245                break;
1246        case MAINTENANCE_IN:
1247                if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1248                        /*
1249                         * MAINTENANCE_IN from SCC-2
1250                         * Check for emulated MI_REPORT_TARGET_PGS
1251                         */
1252                        if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1253                                cmd->execute_cmd =
1254                                        target_emulate_report_target_port_groups;
1255                        }
1256                        *size = get_unaligned_be32(&cdb[6]);
1257                } else {
1258                        /*
1259                         * GPCMD_SEND_KEY from multi media commands
1260                         */
1261                        *size = get_unaligned_be16(&cdb[8]);
1262                }
1263                break;
1264        case MAINTENANCE_OUT:
1265                if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1266                        /*
1267                         * MAINTENANCE_OUT from SCC-2
1268                         * Check for emulated MO_SET_TARGET_PGS.
1269                         */
1270                        if (cdb[1] == MO_SET_TARGET_PGS) {
1271                                cmd->execute_cmd =
1272                                        target_emulate_set_target_port_groups;
1273                        }
1274                        *size = get_unaligned_be32(&cdb[6]);
1275                } else {
1276                        /*
1277                         * GPCMD_SEND_KEY from multi media commands
1278                         */
1279                        *size = get_unaligned_be16(&cdb[8]);
1280                }
1281                break;
1282        default:
1283                pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
1284                        " 0x%02x, sending CHECK_CONDITION.\n",
1285                        cmd->se_tfo->get_fabric_name(), cdb[0]);
1286                return TCM_UNSUPPORTED_SCSI_OPCODE;
1287        }
1288
1289        return 0;
1290}
1291EXPORT_SYMBOL(spc_parse_cdb);
1292
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