linux/drivers/target/target_core_spc.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * SCSI Primary Commands (SPC) parsing and emulation.
   4 *
   5 * (c) Copyright 2002-2013 Datera, Inc.
   6 *
   7 * Nicholas A. Bellinger <nab@kernel.org>
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/module.h>
  12#include <asm/unaligned.h>
  13
  14#include <scsi/scsi_proto.h>
  15#include <scsi/scsi_common.h>
  16#include <scsi/scsi_tcq.h>
  17
  18#include <target/target_core_base.h>
  19#include <target/target_core_backend.h>
  20#include <target/target_core_fabric.h>
  21
  22#include "target_core_internal.h"
  23#include "target_core_alua.h"
  24#include "target_core_pr.h"
  25#include "target_core_ua.h"
  26#include "target_core_xcopy.h"
  27
  28static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf)
  29{
  30        struct t10_alua_tg_pt_gp *tg_pt_gp;
  31
  32        /*
  33         * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS.
  34         */
  35        buf[5]  = 0x80;
  36
  37        /*
  38         * Set TPGS field for explicit and/or implicit ALUA access type
  39         * and opteration.
  40         *
  41         * See spc4r17 section 6.4.2 Table 135
  42         */
  43        spin_lock(&lun->lun_tg_pt_gp_lock);
  44        tg_pt_gp = lun->lun_tg_pt_gp;
  45        if (tg_pt_gp)
  46                buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  47        spin_unlock(&lun->lun_tg_pt_gp_lock);
  48}
  49
  50sense_reason_t
  51spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
  52{
  53        struct se_lun *lun = cmd->se_lun;
  54        struct se_device *dev = cmd->se_dev;
  55        struct se_session *sess = cmd->se_sess;
  56
  57        /* Set RMB (removable media) for tape devices */
  58        if (dev->transport->get_device_type(dev) == TYPE_TAPE)
  59                buf[1] = 0x80;
  60
  61        buf[2] = 0x05; /* SPC-3 */
  62
  63        /*
  64         * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
  65         *
  66         * SPC4 says:
  67         *   A RESPONSE DATA FORMAT field set to 2h indicates that the
  68         *   standard INQUIRY data is in the format defined in this
  69         *   standard. Response data format values less than 2h are
  70         *   obsolete. Response data format values greater than 2h are
  71         *   reserved.
  72         */
  73        buf[3] = 2;
  74
  75        /*
  76         * Enable SCCS and TPGS fields for Emulated ALUA
  77         */
  78        spc_fill_alua_data(lun, buf);
  79
  80        /*
  81         * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
  82         */
  83        if (dev->dev_attrib.emulate_3pc)
  84                buf[5] |= 0x8;
  85        /*
  86         * Set Protection (PROTECT) bit when DIF has been enabled on the
  87         * device, and the fabric supports VERIFY + PASS.  Also report
  88         * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
  89         * to unprotected devices.
  90         */
  91        if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
  92                if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
  93                        buf[5] |= 0x1;
  94        }
  95
  96        buf[7] = 0x2; /* CmdQue=1 */
  97
  98        /*
  99         * ASCII data fields described as being left-aligned shall have any
 100         * unused bytes at the end of the field (i.e., highest offset) and the
 101         * unused bytes shall be filled with ASCII space characters (20h).
 102         */
 103        memset(&buf[8], 0x20,
 104               INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
 105        memcpy(&buf[8], dev->t10_wwn.vendor,
 106               strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 107        memcpy(&buf[16], dev->t10_wwn.model,
 108               strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
 109        memcpy(&buf[32], dev->t10_wwn.revision,
 110               strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
 111        buf[4] = 31; /* Set additional length to 31 */
 112
 113        return 0;
 114}
 115EXPORT_SYMBOL(spc_emulate_inquiry_std);
 116
 117/* unit serial number */
 118static sense_reason_t
 119spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 120{
 121        struct se_device *dev = cmd->se_dev;
 122        u16 len;
 123
 124        if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 125                len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
 126                len++; /* Extra Byte for NULL Terminator */
 127                buf[3] = len;
 128        }
 129        return 0;
 130}
 131
 132void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
 133                                      unsigned char *buf)
 134{
 135        unsigned char *p = &dev->t10_wwn.unit_serial[0];
 136        int cnt;
 137        bool next = true;
 138
 139        /*
 140         * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 141         * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
 142         * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
 143         * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
 144         * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 145         * per device uniqeness.
 146         */
 147        for (cnt = 0; *p && cnt < 13; p++) {
 148                int val = hex_to_bin(*p);
 149
 150                if (val < 0)
 151                        continue;
 152
 153                if (next) {
 154                        next = false;
 155                        buf[cnt++] |= val;
 156                } else {
 157                        next = true;
 158                        buf[cnt] = val << 4;
 159                }
 160        }
 161}
 162
 163/*
 164 * Device identification VPD, for a complete list of
 165 * DESIGNATOR TYPEs see spc4r17 Table 459.
 166 */
 167sense_reason_t
 168spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 169{
 170        struct se_device *dev = cmd->se_dev;
 171        struct se_lun *lun = cmd->se_lun;
 172        struct se_portal_group *tpg = NULL;
 173        struct t10_alua_lu_gp_member *lu_gp_mem;
 174        struct t10_alua_tg_pt_gp *tg_pt_gp;
 175        unsigned char *prod = &dev->t10_wwn.model[0];
 176        u32 prod_len;
 177        u32 unit_serial_len, off = 0;
 178        u16 len = 0, id_len;
 179
 180        off = 4;
 181
 182        /*
 183         * NAA IEEE Registered Extended Assigned designator format, see
 184         * spc4r17 section 7.7.3.6.5
 185         *
 186         * We depend upon a target_core_mod/ConfigFS provided
 187         * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 188         * value in order to return the NAA id.
 189         */
 190        if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
 191                goto check_t10_vend_desc;
 192
 193        /* CODE SET == Binary */
 194        buf[off++] = 0x1;
 195
 196        /* Set ASSOCIATION == addressed logical unit: 0)b */
 197        buf[off] = 0x00;
 198
 199        /* Identifier/Designator type == NAA identifier */
 200        buf[off++] |= 0x3;
 201        off++;
 202
 203        /* Identifier/Designator length */
 204        buf[off++] = 0x10;
 205
 206        /*
 207         * Start NAA IEEE Registered Extended Identifier/Designator
 208         */
 209        buf[off++] = (0x6 << 4);
 210
 211        /*
 212         * Use OpenFabrics IEEE Company ID: 00 14 05
 213         */
 214        buf[off++] = 0x01;
 215        buf[off++] = 0x40;
 216        buf[off] = (0x5 << 4);
 217
 218        /*
 219         * Return ConfigFS Unit Serial Number information for
 220         * VENDOR_SPECIFIC_IDENTIFIER and
 221         * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
 222         */
 223        spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
 224
 225        len = 20;
 226        off = (len + 4);
 227
 228check_t10_vend_desc:
 229        /*
 230         * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 231         */
 232        id_len = 8; /* For Vendor field */
 233        prod_len = 4; /* For VPD Header */
 234        prod_len += 8; /* For Vendor field */
 235        prod_len += strlen(prod);
 236        prod_len++; /* For : */
 237
 238        if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 239                unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
 240                unit_serial_len++; /* For NULL Terminator */
 241
 242                id_len += sprintf(&buf[off+12], "%s:%s", prod,
 243                                &dev->t10_wwn.unit_serial[0]);
 244        }
 245        buf[off] = 0x2; /* ASCII */
 246        buf[off+1] = 0x1; /* T10 Vendor ID */
 247        buf[off+2] = 0x0;
 248        /* left align Vendor ID and pad with spaces */
 249        memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
 250        memcpy(&buf[off+4], dev->t10_wwn.vendor,
 251               strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 252        /* Extra Byte for NULL Terminator */
 253        id_len++;
 254        /* Identifier Length */
 255        buf[off+3] = id_len;
 256        /* Header size for Designation descriptor */
 257        len += (id_len + 4);
 258        off += (id_len + 4);
 259
 260        if (1) {
 261                struct t10_alua_lu_gp *lu_gp;
 262                u32 padding, scsi_name_len, scsi_target_len;
 263                u16 lu_gp_id = 0;
 264                u16 tg_pt_gp_id = 0;
 265                u16 tpgt;
 266
 267                tpg = lun->lun_tpg;
 268                /*
 269                 * Relative target port identifer, see spc4r17
 270                 * section 7.7.3.7
 271                 *
 272                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 273                 * section 7.5.1 Table 362
 274                 */
 275                buf[off] = tpg->proto_id << 4;
 276                buf[off++] |= 0x1; /* CODE SET == Binary */
 277                buf[off] = 0x80; /* Set PIV=1 */
 278                /* Set ASSOCIATION == target port: 01b */
 279                buf[off] |= 0x10;
 280                /* DESIGNATOR TYPE == Relative target port identifer */
 281                buf[off++] |= 0x4;
 282                off++; /* Skip over Reserved */
 283                buf[off++] = 4; /* DESIGNATOR LENGTH */
 284                /* Skip over Obsolete field in RTPI payload
 285                 * in Table 472 */
 286                off += 2;
 287                put_unaligned_be16(lun->lun_rtpi, &buf[off]);
 288                off += 2;
 289                len += 8; /* Header size + Designation descriptor */
 290                /*
 291                 * Target port group identifier, see spc4r17
 292                 * section 7.7.3.8
 293                 *
 294                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 295                 * section 7.5.1 Table 362
 296                 */
 297                spin_lock(&lun->lun_tg_pt_gp_lock);
 298                tg_pt_gp = lun->lun_tg_pt_gp;
 299                if (!tg_pt_gp) {
 300                        spin_unlock(&lun->lun_tg_pt_gp_lock);
 301                        goto check_lu_gp;
 302                }
 303                tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 304                spin_unlock(&lun->lun_tg_pt_gp_lock);
 305
 306                buf[off] = tpg->proto_id << 4;
 307                buf[off++] |= 0x1; /* CODE SET == Binary */
 308                buf[off] = 0x80; /* Set PIV=1 */
 309                /* Set ASSOCIATION == target port: 01b */
 310                buf[off] |= 0x10;
 311                /* DESIGNATOR TYPE == Target port group identifier */
 312                buf[off++] |= 0x5;
 313                off++; /* Skip over Reserved */
 314                buf[off++] = 4; /* DESIGNATOR LENGTH */
 315                off += 2; /* Skip over Reserved Field */
 316                put_unaligned_be16(tg_pt_gp_id, &buf[off]);
 317                off += 2;
 318                len += 8; /* Header size + Designation descriptor */
 319                /*
 320                 * Logical Unit Group identifier, see spc4r17
 321                 * section 7.7.3.8
 322                 */
 323check_lu_gp:
 324                lu_gp_mem = dev->dev_alua_lu_gp_mem;
 325                if (!lu_gp_mem)
 326                        goto check_scsi_name;
 327
 328                spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 329                lu_gp = lu_gp_mem->lu_gp;
 330                if (!lu_gp) {
 331                        spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 332                        goto check_scsi_name;
 333                }
 334                lu_gp_id = lu_gp->lu_gp_id;
 335                spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 336
 337                buf[off++] |= 0x1; /* CODE SET == Binary */
 338                /* DESIGNATOR TYPE == Logical Unit Group identifier */
 339                buf[off++] |= 0x6;
 340                off++; /* Skip over Reserved */
 341                buf[off++] = 4; /* DESIGNATOR LENGTH */
 342                off += 2; /* Skip over Reserved Field */
 343                put_unaligned_be16(lu_gp_id, &buf[off]);
 344                off += 2;
 345                len += 8; /* Header size + Designation descriptor */
 346                /*
 347                 * SCSI name string designator, see spc4r17
 348                 * section 7.7.3.11
 349                 *
 350                 * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 351                 * section 7.5.1 Table 362
 352                 */
 353check_scsi_name:
 354                buf[off] = tpg->proto_id << 4;
 355                buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 356                buf[off] = 0x80; /* Set PIV=1 */
 357                /* Set ASSOCIATION == target port: 01b */
 358                buf[off] |= 0x10;
 359                /* DESIGNATOR TYPE == SCSI name string */
 360                buf[off++] |= 0x8;
 361                off += 2; /* Skip over Reserved and length */
 362                /*
 363                 * SCSI name string identifer containing, $FABRIC_MOD
 364                 * dependent information.  For LIO-Target and iSCSI
 365                 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 366                 * UTF-8 encoding.
 367                 */
 368                tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 369                scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 370                                        tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 371                scsi_name_len += 1 /* Include  NULL terminator */;
 372                /*
 373                 * The null-terminated, null-padded (see 4.4.2) SCSI
 374                 * NAME STRING field contains a UTF-8 format string.
 375                 * The number of bytes in the SCSI NAME STRING field
 376                 * (i.e., the value in the DESIGNATOR LENGTH field)
 377                 * shall be no larger than 256 and shall be a multiple
 378                 * of four.
 379                 */
 380                padding = ((-scsi_name_len) & 3);
 381                if (padding)
 382                        scsi_name_len += padding;
 383                if (scsi_name_len > 256)
 384                        scsi_name_len = 256;
 385
 386                buf[off-1] = scsi_name_len;
 387                off += scsi_name_len;
 388                /* Header size + Designation descriptor */
 389                len += (scsi_name_len + 4);
 390
 391                /*
 392                 * Target device designator
 393                 */
 394                buf[off] = tpg->proto_id << 4;
 395                buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 396                buf[off] = 0x80; /* Set PIV=1 */
 397                /* Set ASSOCIATION == target device: 10b */
 398                buf[off] |= 0x20;
 399                /* DESIGNATOR TYPE == SCSI name string */
 400                buf[off++] |= 0x8;
 401                off += 2; /* Skip over Reserved and length */
 402                /*
 403                 * SCSI name string identifer containing, $FABRIC_MOD
 404                 * dependent information.  For LIO-Target and iSCSI
 405                 * Target Port, this means "<iSCSI name>" in
 406                 * UTF-8 encoding.
 407                 */
 408                scsi_target_len = sprintf(&buf[off], "%s",
 409                                          tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 410                scsi_target_len += 1 /* Include  NULL terminator */;
 411                /*
 412                 * The null-terminated, null-padded (see 4.4.2) SCSI
 413                 * NAME STRING field contains a UTF-8 format string.
 414                 * The number of bytes in the SCSI NAME STRING field
 415                 * (i.e., the value in the DESIGNATOR LENGTH field)
 416                 * shall be no larger than 256 and shall be a multiple
 417                 * of four.
 418                 */
 419                padding = ((-scsi_target_len) & 3);
 420                if (padding)
 421                        scsi_target_len += padding;
 422                if (scsi_target_len > 256)
 423                        scsi_target_len = 256;
 424
 425                buf[off-1] = scsi_target_len;
 426                off += scsi_target_len;
 427
 428                /* Header size + Designation descriptor */
 429                len += (scsi_target_len + 4);
 430        }
 431        put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
 432        return 0;
 433}
 434EXPORT_SYMBOL(spc_emulate_evpd_83);
 435
 436/* Extended INQUIRY Data VPD Page */
 437static sense_reason_t
 438spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 439{
 440        struct se_device *dev = cmd->se_dev;
 441        struct se_session *sess = cmd->se_sess;
 442
 443        buf[3] = 0x3c;
 444        /*
 445         * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
 446         * only for TYPE3 protection.
 447         */
 448        if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 449                if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
 450                    cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
 451                        buf[4] = 0x5;
 452                else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
 453                         cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
 454                        buf[4] = 0x4;
 455        }
 456
 457        /* logical unit supports type 1 and type 3 protection */
 458        if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
 459            (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
 460            (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
 461                buf[4] |= (0x3 << 3);
 462        }
 463
 464        /* Set HEADSUP, ORDSUP, SIMPSUP */
 465        buf[5] = 0x07;
 466
 467        /* If WriteCache emulation is enabled, set V_SUP */
 468        if (target_check_wce(dev))
 469                buf[6] = 0x01;
 470        /* If an LBA map is present set R_SUP */
 471        spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
 472        if (!list_empty(&dev->t10_alua.lba_map_list))
 473                buf[8] = 0x10;
 474        spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
 475        return 0;
 476}
 477
 478/* Block Limits VPD page */
 479static sense_reason_t
 480spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 481{
 482        struct se_device *dev = cmd->se_dev;
 483        u32 mtl = 0;
 484        int have_tp = 0, opt, min;
 485
 486        /*
 487         * Following spc3r22 section 6.5.3 Block Limits VPD page, when
 488         * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 489         * different page length for Thin Provisioning.
 490         */
 491        if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 492                have_tp = 1;
 493
 494        buf[0] = dev->transport->get_device_type(dev);
 495        buf[3] = have_tp ? 0x3c : 0x10;
 496
 497        /* Set WSNZ to 1 */
 498        buf[4] = 0x01;
 499        /*
 500         * Set MAXIMUM COMPARE AND WRITE LENGTH
 501         */
 502        if (dev->dev_attrib.emulate_caw)
 503                buf[5] = 0x01;
 504
 505        /*
 506         * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 507         */
 508        if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
 509                put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
 510        else
 511                put_unaligned_be16(1, &buf[6]);
 512
 513        /*
 514         * Set MAXIMUM TRANSFER LENGTH
 515         *
 516         * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
 517         * enforcing maximum HW scatter-gather-list entry limit
 518         */
 519        if (cmd->se_tfo->max_data_sg_nents) {
 520                mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
 521                       dev->dev_attrib.block_size;
 522        }
 523        put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
 524
 525        /*
 526         * Set OPTIMAL TRANSFER LENGTH
 527         */
 528        if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
 529                put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
 530        else
 531                put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
 532
 533        /*
 534         * Exit now if we don't support TP.
 535         */
 536        if (!have_tp)
 537                goto max_write_same;
 538
 539        /*
 540         * Set MAXIMUM UNMAP LBA COUNT
 541         */
 542        put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
 543
 544        /*
 545         * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 546         */
 547        put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
 548                           &buf[24]);
 549
 550        /*
 551         * Set OPTIMAL UNMAP GRANULARITY
 552         */
 553        put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
 554
 555        /*
 556         * UNMAP GRANULARITY ALIGNMENT
 557         */
 558        put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
 559                           &buf[32]);
 560        if (dev->dev_attrib.unmap_granularity_alignment != 0)
 561                buf[32] |= 0x80; /* Set the UGAVALID bit */
 562
 563        /*
 564         * MAXIMUM WRITE SAME LENGTH
 565         */
 566max_write_same:
 567        put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
 568
 569        return 0;
 570}
 571
 572/* Block Device Characteristics VPD page */
 573static sense_reason_t
 574spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 575{
 576        struct se_device *dev = cmd->se_dev;
 577
 578        buf[0] = dev->transport->get_device_type(dev);
 579        buf[3] = 0x3c;
 580        buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
 581
 582        return 0;
 583}
 584
 585/* Thin Provisioning VPD */
 586static sense_reason_t
 587spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 588{
 589        struct se_device *dev = cmd->se_dev;
 590
 591        /*
 592         * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
 593         *
 594         * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 595         * zero, then the page length shall be set to 0004h.  If the DP bit
 596         * is set to one, then the page length shall be set to the value
 597         * defined in table 162.
 598         */
 599        buf[0] = dev->transport->get_device_type(dev);
 600
 601        /*
 602         * Set Hardcoded length mentioned above for DP=0
 603         */
 604        put_unaligned_be16(0x0004, &buf[2]);
 605
 606        /*
 607         * The THRESHOLD EXPONENT field indicates the threshold set size in
 608         * LBAs as a power of 2 (i.e., the threshold set size is equal to
 609         * 2(threshold exponent)).
 610         *
 611         * Note that this is currently set to 0x00 as mkp says it will be
 612         * changing again.  We can enable this once it has settled in T10
 613         * and is actually used by Linux/SCSI ML code.
 614         */
 615        buf[4] = 0x00;
 616
 617        /*
 618         * A TPU bit set to one indicates that the device server supports
 619         * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 620         * that the device server does not support the UNMAP command.
 621         */
 622        if (dev->dev_attrib.emulate_tpu != 0)
 623                buf[5] = 0x80;
 624
 625        /*
 626         * A TPWS bit set to one indicates that the device server supports
 627         * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 628         * A TPWS bit set to zero indicates that the device server does not
 629         * support the use of the WRITE SAME (16) command to unmap LBAs.
 630         */
 631        if (dev->dev_attrib.emulate_tpws != 0)
 632                buf[5] |= 0x40 | 0x20;
 633
 634        /*
 635         * The unmap_zeroes_data set means that the underlying device supports
 636         * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
 637         * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
 638         * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
 639         * See sbc4r36 6.6.4.
 640         */
 641        if (((dev->dev_attrib.emulate_tpu != 0) ||
 642             (dev->dev_attrib.emulate_tpws != 0)) &&
 643             (dev->dev_attrib.unmap_zeroes_data != 0))
 644                buf[5] |= 0x04;
 645
 646        return 0;
 647}
 648
 649/* Referrals VPD page */
 650static sense_reason_t
 651spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
 652{
 653        struct se_device *dev = cmd->se_dev;
 654
 655        buf[0] = dev->transport->get_device_type(dev);
 656        buf[3] = 0x0c;
 657        put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
 658        put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
 659
 660        return 0;
 661}
 662
 663static sense_reason_t
 664spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 665
 666static struct {
 667        uint8_t         page;
 668        sense_reason_t  (*emulate)(struct se_cmd *, unsigned char *);
 669} evpd_handlers[] = {
 670        { .page = 0x00, .emulate = spc_emulate_evpd_00 },
 671        { .page = 0x80, .emulate = spc_emulate_evpd_80 },
 672        { .page = 0x83, .emulate = spc_emulate_evpd_83 },
 673        { .page = 0x86, .emulate = spc_emulate_evpd_86 },
 674        { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
 675        { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
 676        { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
 677        { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
 678};
 679
 680/* supported vital product data pages */
 681static sense_reason_t
 682spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 683{
 684        int p;
 685
 686        /*
 687         * Only report the INQUIRY EVPD=1 pages after a valid NAA
 688         * Registered Extended LUN WWN has been set via ConfigFS
 689         * during device creation/restart.
 690         */
 691        if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 692                buf[3] = ARRAY_SIZE(evpd_handlers);
 693                for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
 694                        buf[p + 4] = evpd_handlers[p].page;
 695        }
 696
 697        return 0;
 698}
 699
 700static sense_reason_t
 701spc_emulate_inquiry(struct se_cmd *cmd)
 702{
 703        struct se_device *dev = cmd->se_dev;
 704        unsigned char *rbuf;
 705        unsigned char *cdb = cmd->t_task_cdb;
 706        unsigned char *buf;
 707        sense_reason_t ret;
 708        int p;
 709        int len = 0;
 710
 711        buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
 712        if (!buf) {
 713                pr_err("Unable to allocate response buffer for INQUIRY\n");
 714                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 715        }
 716
 717        buf[0] = dev->transport->get_device_type(dev);
 718
 719        if (!(cdb[1] & 0x1)) {
 720                if (cdb[2]) {
 721                        pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
 722                               cdb[2]);
 723                        ret = TCM_INVALID_CDB_FIELD;
 724                        goto out;
 725                }
 726
 727                ret = spc_emulate_inquiry_std(cmd, buf);
 728                len = buf[4] + 5;
 729                goto out;
 730        }
 731
 732        for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
 733                if (cdb[2] == evpd_handlers[p].page) {
 734                        buf[1] = cdb[2];
 735                        ret = evpd_handlers[p].emulate(cmd, buf);
 736                        len = get_unaligned_be16(&buf[2]) + 4;
 737                        goto out;
 738                }
 739        }
 740
 741        pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
 742        ret = TCM_INVALID_CDB_FIELD;
 743
 744out:
 745        rbuf = transport_kmap_data_sg(cmd);
 746        if (rbuf) {
 747                memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
 748                transport_kunmap_data_sg(cmd);
 749        }
 750        kfree(buf);
 751
 752        if (!ret)
 753                target_complete_cmd_with_length(cmd, GOOD, len);
 754        return ret;
 755}
 756
 757static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
 758{
 759        p[0] = 0x01;
 760        p[1] = 0x0a;
 761
 762        /* No changeable values for now */
 763        if (pc == 1)
 764                goto out;
 765
 766out:
 767        return 12;
 768}
 769
 770static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
 771{
 772        struct se_device *dev = cmd->se_dev;
 773        struct se_session *sess = cmd->se_sess;
 774
 775        p[0] = 0x0a;
 776        p[1] = 0x0a;
 777
 778        /* No changeable values for now */
 779        if (pc == 1)
 780                goto out;
 781
 782        /* GLTSD: No implicit save of log parameters */
 783        p[2] = (1 << 1);
 784        if (target_sense_desc_format(dev))
 785                /* D_SENSE: Descriptor format sense data for 64bit sectors */
 786                p[2] |= (1 << 2);
 787
 788        /*
 789         * From spc4r23, 7.4.7 Control mode page
 790         *
 791         * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
 792         * restrictions on the algorithm used for reordering commands
 793         * having the SIMPLE task attribute (see SAM-4).
 794         *
 795         *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
 796         *                         Code      Description
 797         *                          0h       Restricted reordering
 798         *                          1h       Unrestricted reordering allowed
 799         *                          2h to 7h    Reserved
 800         *                          8h to Fh    Vendor specific
 801         *
 802         * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
 803         * the device server shall order the processing sequence of commands
 804         * having the SIMPLE task attribute such that data integrity is maintained
 805         * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
 806         * requests is halted at any time, the final value of all data observable
 807         * on the medium shall be the same as if all the commands had been processed
 808         * with the ORDERED task attribute).
 809         *
 810         * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
 811         * device server may reorder the processing sequence of commands having the
 812         * SIMPLE task attribute in any manner. Any data integrity exposures related to
 813         * command sequence order shall be explicitly handled by the application client
 814         * through the selection of appropriate ommands and task attributes.
 815         */
 816        p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
 817        /*
 818         * From spc4r17, section 7.4.6 Control mode Page
 819         *
 820         * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 821         *
 822         * 00b: The logical unit shall clear any unit attention condition
 823         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 824         * status and shall not establish a unit attention condition when a com-
 825         * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 826         * status.
 827         *
 828         * 10b: The logical unit shall not clear any unit attention condition
 829         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 830         * status and shall not establish a unit attention condition when
 831         * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 832         * CONFLICT status.
 833         *
 834         * 11b a The logical unit shall not clear any unit attention condition
 835         * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 836         * status and shall establish a unit attention condition for the
 837         * initiator port associated with the I_T nexus on which the BUSY,
 838         * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 839         * Depending on the status, the additional sense code shall be set to
 840         * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 841         * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 842         * command, a unit attention condition shall be established only once
 843         * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 844         * to the number of commands completed with one of those status codes.
 845         */
 846        switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
 847        case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
 848                p[4] = 0x30;
 849                break;
 850        case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
 851                p[4] = 0x20;
 852                break;
 853        default:        /* TARGET_UA_INTLCK_CTRL_CLEAR */
 854                p[4] = 0x00;
 855                break;
 856        }
 857        /*
 858         * From spc4r17, section 7.4.6 Control mode Page
 859         *
 860         * Task Aborted Status (TAS) bit set to zero.
 861         *
 862         * A task aborted status (TAS) bit set to zero specifies that aborted
 863         * tasks shall be terminated by the device server without any response
 864         * to the application client. A TAS bit set to one specifies that tasks
 865         * aborted by the actions of an I_T nexus other than the I_T nexus on
 866         * which the command was received shall be completed with TASK ABORTED
 867         * status (see SAM-4).
 868         */
 869        p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
 870        /*
 871         * From spc4r30, section 7.5.7 Control mode page
 872         *
 873         * Application Tag Owner (ATO) bit set to one.
 874         *
 875         * If the ATO bit is set to one the device server shall not modify the
 876         * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
 877         * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
 878         * TAG field.
 879         */
 880        if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 881                if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
 882                        p[5] |= 0x80;
 883        }
 884
 885        p[8] = 0xff;
 886        p[9] = 0xff;
 887        p[11] = 30;
 888
 889out:
 890        return 12;
 891}
 892
 893static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
 894{
 895        struct se_device *dev = cmd->se_dev;
 896
 897        p[0] = 0x08;
 898        p[1] = 0x12;
 899
 900        /* No changeable values for now */
 901        if (pc == 1)
 902                goto out;
 903
 904        if (target_check_wce(dev))
 905                p[2] = 0x04; /* Write Cache Enable */
 906        p[12] = 0x20; /* Disabled Read Ahead */
 907
 908out:
 909        return 20;
 910}
 911
 912static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
 913{
 914        p[0] = 0x1c;
 915        p[1] = 0x0a;
 916
 917        /* No changeable values for now */
 918        if (pc == 1)
 919                goto out;
 920
 921out:
 922        return 12;
 923}
 924
 925static struct {
 926        uint8_t         page;
 927        uint8_t         subpage;
 928        int             (*emulate)(struct se_cmd *, u8, unsigned char *);
 929} modesense_handlers[] = {
 930        { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
 931        { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
 932        { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
 933        { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
 934};
 935
 936static void spc_modesense_write_protect(unsigned char *buf, int type)
 937{
 938        /*
 939         * I believe that the WP bit (bit 7) in the mode header is the same for
 940         * all device types..
 941         */
 942        switch (type) {
 943        case TYPE_DISK:
 944        case TYPE_TAPE:
 945        default:
 946                buf[0] |= 0x80; /* WP bit */
 947                break;
 948        }
 949}
 950
 951static void spc_modesense_dpofua(unsigned char *buf, int type)
 952{
 953        switch (type) {
 954        case TYPE_DISK:
 955                buf[0] |= 0x10; /* DPOFUA bit */
 956                break;
 957        default:
 958                break;
 959        }
 960}
 961
 962static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 963{
 964        *buf++ = 8;
 965        put_unaligned_be32(min(blocks, 0xffffffffull), buf);
 966        buf += 4;
 967        put_unaligned_be32(block_size, buf);
 968        return 9;
 969}
 970
 971static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 972{
 973        if (blocks <= 0xffffffff)
 974                return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
 975
 976        *buf++ = 1;             /* LONGLBA */
 977        buf += 2;
 978        *buf++ = 16;
 979        put_unaligned_be64(blocks, buf);
 980        buf += 12;
 981        put_unaligned_be32(block_size, buf);
 982
 983        return 17;
 984}
 985
 986static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
 987{
 988        struct se_device *dev = cmd->se_dev;
 989        char *cdb = cmd->t_task_cdb;
 990        unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
 991        int type = dev->transport->get_device_type(dev);
 992        int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
 993        bool dbd = !!(cdb[1] & 0x08);
 994        bool llba = ten ? !!(cdb[1] & 0x10) : false;
 995        u8 pc = cdb[2] >> 6;
 996        u8 page = cdb[2] & 0x3f;
 997        u8 subpage = cdb[3];
 998        int length = 0;
 999        int ret;
1000        int i;
1001
1002        memset(buf, 0, SE_MODE_PAGE_BUF);
1003
1004        /*
1005         * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1006         * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1007         */
1008        length = ten ? 3 : 2;
1009
1010        /* DEVICE-SPECIFIC PARAMETER */
1011        if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1012                spc_modesense_write_protect(&buf[length], type);
1013
1014        /*
1015         * SBC only allows us to enable FUA and DPO together.  Fortunately
1016         * DPO is explicitly specified as a hint, so a noop is a perfectly
1017         * valid implementation.
1018         */
1019        if (target_check_fua(dev))
1020                spc_modesense_dpofua(&buf[length], type);
1021
1022        ++length;
1023
1024        /* BLOCK DESCRIPTOR */
1025
1026        /*
1027         * For now we only include a block descriptor for disk (SBC)
1028         * devices; other command sets use a slightly different format.
1029         */
1030        if (!dbd && type == TYPE_DISK) {
1031                u64 blocks = dev->transport->get_blocks(dev);
1032                u32 block_size = dev->dev_attrib.block_size;
1033
1034                if (ten) {
1035                        if (llba) {
1036                                length += spc_modesense_long_blockdesc(&buf[length],
1037                                                                       blocks, block_size);
1038                        } else {
1039                                length += 3;
1040                                length += spc_modesense_blockdesc(&buf[length],
1041                                                                  blocks, block_size);
1042                        }
1043                } else {
1044                        length += spc_modesense_blockdesc(&buf[length], blocks,
1045                                                          block_size);
1046                }
1047        } else {
1048                if (ten)
1049                        length += 4;
1050                else
1051                        length += 1;
1052        }
1053
1054        if (page == 0x3f) {
1055                if (subpage != 0x00 && subpage != 0xff) {
1056                        pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1057                        return TCM_INVALID_CDB_FIELD;
1058                }
1059
1060                for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1061                        /*
1062                         * Tricky way to say all subpage 00h for
1063                         * subpage==0, all subpages for subpage==0xff
1064                         * (and we just checked above that those are
1065                         * the only two possibilities).
1066                         */
1067                        if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1068                                ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1069                                if (!ten && length + ret >= 255)
1070                                        break;
1071                                length += ret;
1072                        }
1073                }
1074
1075                goto set_length;
1076        }
1077
1078        for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1079                if (modesense_handlers[i].page == page &&
1080                    modesense_handlers[i].subpage == subpage) {
1081                        length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1082                        goto set_length;
1083                }
1084
1085        /*
1086         * We don't intend to implement:
1087         *  - obsolete page 03h "format parameters" (checked by Solaris)
1088         */
1089        if (page != 0x03)
1090                pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1091                       page, subpage);
1092
1093        return TCM_UNKNOWN_MODE_PAGE;
1094
1095set_length:
1096        if (ten)
1097                put_unaligned_be16(length - 2, buf);
1098        else
1099                buf[0] = length - 1;
1100
1101        rbuf = transport_kmap_data_sg(cmd);
1102        if (rbuf) {
1103                memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1104                transport_kunmap_data_sg(cmd);
1105        }
1106
1107        target_complete_cmd_with_length(cmd, GOOD, length);
1108        return 0;
1109}
1110
1111static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1112{
1113        char *cdb = cmd->t_task_cdb;
1114        bool ten = cdb[0] == MODE_SELECT_10;
1115        int off = ten ? 8 : 4;
1116        bool pf = !!(cdb[1] & 0x10);
1117        u8 page, subpage;
1118        unsigned char *buf;
1119        unsigned char tbuf[SE_MODE_PAGE_BUF];
1120        int length;
1121        sense_reason_t ret = 0;
1122        int i;
1123
1124        if (!cmd->data_length) {
1125                target_complete_cmd(cmd, GOOD);
1126                return 0;
1127        }
1128
1129        if (cmd->data_length < off + 2)
1130                return TCM_PARAMETER_LIST_LENGTH_ERROR;
1131
1132        buf = transport_kmap_data_sg(cmd);
1133        if (!buf)
1134                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1135
1136        if (!pf) {
1137                ret = TCM_INVALID_CDB_FIELD;
1138                goto out;
1139        }
1140
1141        page = buf[off] & 0x3f;
1142        subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1143
1144        for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1145                if (modesense_handlers[i].page == page &&
1146                    modesense_handlers[i].subpage == subpage) {
1147                        memset(tbuf, 0, SE_MODE_PAGE_BUF);
1148                        length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1149                        goto check_contents;
1150                }
1151
1152        ret = TCM_UNKNOWN_MODE_PAGE;
1153        goto out;
1154
1155check_contents:
1156        if (cmd->data_length < off + length) {
1157                ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1158                goto out;
1159        }
1160
1161        if (memcmp(buf + off, tbuf, length))
1162                ret = TCM_INVALID_PARAMETER_LIST;
1163
1164out:
1165        transport_kunmap_data_sg(cmd);
1166
1167        if (!ret)
1168                target_complete_cmd(cmd, GOOD);
1169        return ret;
1170}
1171
1172static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1173{
1174        unsigned char *cdb = cmd->t_task_cdb;
1175        unsigned char *rbuf;
1176        u8 ua_asc = 0, ua_ascq = 0;
1177        unsigned char buf[SE_SENSE_BUF];
1178        bool desc_format = target_sense_desc_format(cmd->se_dev);
1179
1180        memset(buf, 0, SE_SENSE_BUF);
1181
1182        if (cdb[1] & 0x01) {
1183                pr_err("REQUEST_SENSE description emulation not"
1184                        " supported\n");
1185                return TCM_INVALID_CDB_FIELD;
1186        }
1187
1188        rbuf = transport_kmap_data_sg(cmd);
1189        if (!rbuf)
1190                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1191
1192        if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1193                scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1194                                        ua_asc, ua_ascq);
1195        else
1196                scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1197
1198        memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1199        transport_kunmap_data_sg(cmd);
1200
1201        target_complete_cmd(cmd, GOOD);
1202        return 0;
1203}
1204
1205sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1206{
1207        struct se_dev_entry *deve;
1208        struct se_session *sess = cmd->se_sess;
1209        struct se_node_acl *nacl;
1210        struct scsi_lun slun;
1211        unsigned char *buf;
1212        u32 lun_count = 0, offset = 8;
1213        __be32 len;
1214
1215        buf = transport_kmap_data_sg(cmd);
1216        if (cmd->data_length && !buf)
1217                return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1218
1219        /*
1220         * If no struct se_session pointer is present, this struct se_cmd is
1221         * coming via a target_core_mod PASSTHROUGH op, and not through
1222         * a $FABRIC_MOD.  In that case, report LUN=0 only.
1223         */
1224        if (!sess)
1225                goto done;
1226
1227        nacl = sess->se_node_acl;
1228
1229        rcu_read_lock();
1230        hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1231                /*
1232                 * We determine the correct LUN LIST LENGTH even once we
1233                 * have reached the initial allocation length.
1234                 * See SPC2-R20 7.19.
1235                 */
1236                lun_count++;
1237                if (offset >= cmd->data_length)
1238                        continue;
1239
1240                int_to_scsilun(deve->mapped_lun, &slun);
1241                memcpy(buf + offset, &slun,
1242                       min(8u, cmd->data_length - offset));
1243                offset += 8;
1244        }
1245        rcu_read_unlock();
1246
1247        /*
1248         * See SPC3 r07, page 159.
1249         */
1250done:
1251        /*
1252         * If no LUNs are accessible, report virtual LUN 0.
1253         */
1254        if (lun_count == 0) {
1255                int_to_scsilun(0, &slun);
1256                if (cmd->data_length > 8)
1257                        memcpy(buf + offset, &slun,
1258                               min(8u, cmd->data_length - offset));
1259                lun_count = 1;
1260        }
1261
1262        if (buf) {
1263                len = cpu_to_be32(lun_count * 8);
1264                memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1265                transport_kunmap_data_sg(cmd);
1266        }
1267
1268        target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1269        return 0;
1270}
1271EXPORT_SYMBOL(spc_emulate_report_luns);
1272
1273static sense_reason_t
1274spc_emulate_testunitready(struct se_cmd *cmd)
1275{
1276        target_complete_cmd(cmd, GOOD);
1277        return 0;
1278}
1279
1280sense_reason_t
1281spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1282{
1283        struct se_device *dev = cmd->se_dev;
1284        unsigned char *cdb = cmd->t_task_cdb;
1285
1286        if (!dev->dev_attrib.emulate_pr &&
1287            ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1288             (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1289             (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1290             (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1291                return TCM_UNSUPPORTED_SCSI_OPCODE;
1292        }
1293
1294        switch (cdb[0]) {
1295        case MODE_SELECT:
1296                *size = cdb[4];
1297                cmd->execute_cmd = spc_emulate_modeselect;
1298                break;
1299        case MODE_SELECT_10:
1300                *size = get_unaligned_be16(&cdb[7]);
1301                cmd->execute_cmd = spc_emulate_modeselect;
1302                break;
1303        case MODE_SENSE:
1304                *size = cdb[4];
1305                cmd->execute_cmd = spc_emulate_modesense;
1306                break;
1307        case MODE_SENSE_10:
1308                *size = get_unaligned_be16(&cdb[7]);
1309                cmd->execute_cmd = spc_emulate_modesense;
1310                break;
1311        case LOG_SELECT:
1312        case LOG_SENSE:
1313                *size = get_unaligned_be16(&cdb[7]);
1314                break;
1315        case PERSISTENT_RESERVE_IN:
1316                *size = get_unaligned_be16(&cdb[7]);
1317                cmd->execute_cmd = target_scsi3_emulate_pr_in;
1318                break;
1319        case PERSISTENT_RESERVE_OUT:
1320                *size = get_unaligned_be32(&cdb[5]);
1321                cmd->execute_cmd = target_scsi3_emulate_pr_out;
1322                break;
1323        case RELEASE:
1324        case RELEASE_10:
1325                if (cdb[0] == RELEASE_10)
1326                        *size = get_unaligned_be16(&cdb[7]);
1327                else
1328                        *size = cmd->data_length;
1329
1330                cmd->execute_cmd = target_scsi2_reservation_release;
1331                break;
1332        case RESERVE:
1333        case RESERVE_10:
1334                /*
1335                 * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1336                 * Assume the passthrough or $FABRIC_MOD will tell us about it.
1337                 */
1338                if (cdb[0] == RESERVE_10)
1339                        *size = get_unaligned_be16(&cdb[7]);
1340                else
1341                        *size = cmd->data_length;
1342
1343                cmd->execute_cmd = target_scsi2_reservation_reserve;
1344                break;
1345        case REQUEST_SENSE:
1346                *size = cdb[4];
1347                cmd->execute_cmd = spc_emulate_request_sense;
1348                break;
1349        case INQUIRY:
1350                *size = get_unaligned_be16(&cdb[3]);
1351
1352                /*
1353                 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1354                 * See spc4r17 section 5.3
1355                 */
1356                cmd->sam_task_attr = TCM_HEAD_TAG;
1357                cmd->execute_cmd = spc_emulate_inquiry;
1358                break;
1359        case SECURITY_PROTOCOL_IN:
1360        case SECURITY_PROTOCOL_OUT:
1361                *size = get_unaligned_be32(&cdb[6]);
1362                break;
1363        case EXTENDED_COPY:
1364                *size = get_unaligned_be32(&cdb[10]);
1365                cmd->execute_cmd = target_do_xcopy;
1366                break;
1367        case RECEIVE_COPY_RESULTS:
1368                *size = get_unaligned_be32(&cdb[10]);
1369                cmd->execute_cmd = target_do_receive_copy_results;
1370                break;
1371        case READ_ATTRIBUTE:
1372        case WRITE_ATTRIBUTE:
1373                *size = get_unaligned_be32(&cdb[10]);
1374                break;
1375        case RECEIVE_DIAGNOSTIC:
1376        case SEND_DIAGNOSTIC:
1377                *size = get_unaligned_be16(&cdb[3]);
1378                break;
1379        case WRITE_BUFFER:
1380                *size = get_unaligned_be24(&cdb[6]);
1381                break;
1382        case REPORT_LUNS:
1383                cmd->execute_cmd = spc_emulate_report_luns;
1384                *size = get_unaligned_be32(&cdb[6]);
1385                /*
1386                 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1387                 * See spc4r17 section 5.3
1388                 */
1389                cmd->sam_task_attr = TCM_HEAD_TAG;
1390                break;
1391        case TEST_UNIT_READY:
1392                cmd->execute_cmd = spc_emulate_testunitready;
1393                *size = 0;
1394                break;
1395        case MAINTENANCE_IN:
1396                if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1397                        /*
1398                         * MAINTENANCE_IN from SCC-2
1399                         * Check for emulated MI_REPORT_TARGET_PGS
1400                         */
1401                        if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1402                                cmd->execute_cmd =
1403                                        target_emulate_report_target_port_groups;
1404                        }
1405                        *size = get_unaligned_be32(&cdb[6]);
1406                } else {
1407                        /*
1408                         * GPCMD_SEND_KEY from multi media commands
1409                         */
1410                        *size = get_unaligned_be16(&cdb[8]);
1411                }
1412                break;
1413        case MAINTENANCE_OUT:
1414                if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1415                        /*
1416                         * MAINTENANCE_OUT from SCC-2
1417                         * Check for emulated MO_SET_TARGET_PGS.
1418                         */
1419                        if (cdb[1] == MO_SET_TARGET_PGS) {
1420                                cmd->execute_cmd =
1421                                        target_emulate_set_target_port_groups;
1422                        }
1423                        *size = get_unaligned_be32(&cdb[6]);
1424                } else {
1425                        /*
1426                         * GPCMD_SEND_KEY from multi media commands
1427                         */
1428                        *size = get_unaligned_be16(&cdb[8]);
1429                }
1430                break;
1431        default:
1432                return TCM_UNSUPPORTED_SCSI_OPCODE;
1433        }
1434
1435        return 0;
1436}
1437EXPORT_SYMBOL(spc_parse_cdb);
1438