drivers/target/target_core_spc.c

   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
  28 static 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         rcu_read_lock();
  44         tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
  45         if (tg_pt_gp)
  46                 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  47         rcu_read_unlock();
  48 }
  49
  50 static u16
  51 spc_find_scsi_transport_vd(int proto_id)
  52 {
  53         switch (proto_id) {
  54         case SCSI_PROTOCOL_FCP:
  55                 return SCSI_VERSION_DESCRIPTOR_FCP4;
  56         case SCSI_PROTOCOL_ISCSI:
  57                 return SCSI_VERSION_DESCRIPTOR_ISCSI;
  58         case SCSI_PROTOCOL_SAS:
  59                 return SCSI_VERSION_DESCRIPTOR_SAS3;
  60         case SCSI_PROTOCOL_SBP:
  61                 return SCSI_VERSION_DESCRIPTOR_SBP3;
  62         case SCSI_PROTOCOL_SRP:
  63                 return SCSI_VERSION_DESCRIPTOR_SRP;
  64         default:
  65                 pr_warn("Cannot find VERSION DESCRIPTOR value for unknown SCSI"
  66                         " transport PROTOCOL IDENTIFIER %#x\n", proto_id);
  67                 return 0;
  68         }
  69 }
  70
  71 sense_reason_t
  72 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
  73 {
  74         struct se_lun *lun = cmd->se_lun;
  75         struct se_portal_group *tpg = lun->lun_tpg;
  76         struct se_device *dev = cmd->se_dev;
  77         struct se_session *sess = cmd->se_sess;
  78
  79         /* Set RMB (removable media) for tape devices */
  80         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
  81                 buf[1] = 0x80;
  82
  83         buf[2] = 0x06; /* SPC-4 */
  84
  85         /*
  86          * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
  87          *
  88          * SPC4 says:
  89          *   A RESPONSE DATA FORMAT field set to 2h indicates that the
  90          *   standard INQUIRY data is in the format defined in this
  91          *   standard. Response data format values less than 2h are
  92          *   obsolete. Response data format values greater than 2h are
  93          *   reserved.
  94          */
  95         buf[3] = 2;
  96
  97         /*
  98          * Enable SCCS and TPGS fields for Emulated ALUA
  99          */
 100         spc_fill_alua_data(lun, buf);
 101
 102         /*
 103          * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
 104          */
 105         if (dev->dev_attrib.emulate_3pc)
 106                 buf[5] |= 0x8;
 107         /*
 108          * Set Protection (PROTECT) bit when DIF has been enabled on the
 109          * device, and the fabric supports VERIFY + PASS.  Also report
 110          * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
 111          * to unprotected devices.
 112          */
 113         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 114                 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
 115                         buf[5] |= 0x1;
 116         }
 117
 118         /*
 119          * Set MULTIP bit to indicate presence of multiple SCSI target ports
 120          */
 121         if (dev->export_count > 1)
 122                 buf[6] |= 0x10;
 123
 124         buf[7] = 0x2; /* CmdQue=1 */
 125
 126         /*
 127          * ASCII data fields described as being left-aligned shall have any
 128          * unused bytes at the end of the field (i.e., highest offset) and the
 129          * unused bytes shall be filled with ASCII space characters (20h).
 130          */
 131         memset(&buf[8], 0x20,
 132                INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
 133         memcpy(&buf[8], dev->t10_wwn.vendor,
 134                strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 135         memcpy(&buf[16], dev->t10_wwn.model,
 136                strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
 137         memcpy(&buf[32], dev->t10_wwn.revision,
 138                strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
 139
 140         /*
 141          * Set the VERSION DESCRIPTOR fields
 142          */
 143         put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]);
 144         put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]);
 145         put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]);
 146         if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK)
 147                 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]);
 148
 149         buf[4] = 91; /* Set additional length to 91 */
 150
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(spc_emulate_inquiry_std);
 154
 155 /* unit serial number */
 156 static sense_reason_t
 157 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 158 {
 159         struct se_device *dev = cmd->se_dev;
 160         u16 len;
 161
 162         if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 163                 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
 164                 len++; /* Extra Byte for NULL Terminator */
 165                 buf[3] = len;
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * Generate NAA IEEE Registered Extended designator
 172  */
 173 void spc_gen_naa_6h_vendor_specific(struct se_device *dev,
 174                                     unsigned char *buf)
 175 {
 176         unsigned char *p = &dev->t10_wwn.unit_serial[0];
 177         u32 company_id = dev->t10_wwn.company_id;
 178         int cnt, off = 0;
 179         bool next = true;
 180
 181         /*
 182          * Start NAA IEEE Registered Extended Identifier/Designator
 183          */
 184         buf[off] = 0x6 << 4;
 185
 186         /* IEEE COMPANY_ID */
 187         buf[off++] |= (company_id >> 20) & 0xf;
 188         buf[off++] = (company_id >> 12) & 0xff;
 189         buf[off++] = (company_id >> 4) & 0xff;
 190         buf[off] = (company_id & 0xf) << 4;
 191
 192         /*
 193          * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 194          * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
 195          * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
 196          * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
 197          * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 198          * per device uniqeness.
 199          */
 200         for (cnt = off + 13; *p && off < cnt; p++) {
 201                 int val = hex_to_bin(*p);
 202
 203                 if (val < 0)
 204                         continue;
 205
 206                 if (next) {
 207                         next = false;
 208                         buf[off++] |= val;
 209                 } else {
 210                         next = true;
 211                         buf[off] = val << 4;
 212                 }
 213         }
 214 }
 215
 216 /*
 217  * Device identification VPD, for a complete list of
 218  * DESIGNATOR TYPEs see spc4r17 Table 459.
 219  */
 220 sense_reason_t
 221 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 222 {
 223         struct se_device *dev = cmd->se_dev;
 224         struct se_lun *lun = cmd->se_lun;
 225         struct se_portal_group *tpg = NULL;
 226         struct t10_alua_lu_gp_member *lu_gp_mem;
 227         struct t10_alua_tg_pt_gp *tg_pt_gp;
 228         unsigned char *prod = &dev->t10_wwn.model[0];
 229         u32 off = 0;
 230         u16 len = 0, id_len;
 231
 232         off = 4;
 233
 234         /*
 235          * NAA IEEE Registered Extended Assigned designator format, see
 236          * spc4r17 section 7.7.3.6.5
 237          *
 238          * We depend upon a target_core_mod/ConfigFS provided
 239          * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 240          * value in order to return the NAA id.
 241          */
 242         if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
 243                 goto check_t10_vend_desc;
 244
 245         /* CODE SET == Binary */
 246         buf[off++] = 0x1;
 247
 248         /* Set ASSOCIATION == addressed logical unit: 0)b */
 249         buf[off] = 0x00;
 250
 251         /* Identifier/Designator type == NAA identifier */
 252         buf[off++] |= 0x3;
 253         off++;
 254
 255         /* Identifier/Designator length */
 256         buf[off++] = 0x10;
 257
 258         /* NAA IEEE Registered Extended designator */
 259         spc_gen_naa_6h_vendor_specific(dev, &buf[off]);
 260
 261         len = 20;
 262         off = (len + 4);
 263
 264 check_t10_vend_desc:
 265         /*
 266          * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 267          */
 268         id_len = 8; /* For Vendor field */
 269
 270         if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)
 271                 id_len += sprintf(&buf[off+12], "%s:%s", prod,
 272                                 &dev->t10_wwn.unit_serial[0]);
 273         buf[off] = 0x2; /* ASCII */
 274         buf[off+1] = 0x1; /* T10 Vendor ID */
 275         buf[off+2] = 0x0;
 276         /* left align Vendor ID and pad with spaces */
 277         memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
 278         memcpy(&buf[off+4], dev->t10_wwn.vendor,
 279                strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 280         /* Extra Byte for NULL Terminator */
 281         id_len++;
 282         /* Identifier Length */
 283         buf[off+3] = id_len;
 284         /* Header size for Designation descriptor */
 285         len += (id_len + 4);
 286         off += (id_len + 4);
 287
 288         if (1) {
 289                 struct t10_alua_lu_gp *lu_gp;
 290                 u32 padding, scsi_name_len, scsi_target_len;
 291                 u16 lu_gp_id = 0;
 292                 u16 tg_pt_gp_id = 0;
 293                 u16 tpgt;
 294
 295                 tpg = lun->lun_tpg;
 296                 /*
 297                  * Relative target port identifer, see spc4r17
 298                  * section 7.7.3.7
 299                  *
 300                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 301                  * section 7.5.1 Table 362
 302                  */
 303                 buf[off] = tpg->proto_id << 4;
 304                 buf[off++] |= 0x1; /* CODE SET == Binary */
 305                 buf[off] = 0x80; /* Set PIV=1 */
 306                 /* Set ASSOCIATION == target port: 01b */
 307                 buf[off] |= 0x10;
 308                 /* DESIGNATOR TYPE == Relative target port identifer */
 309                 buf[off++] |= 0x4;
 310                 off++; /* Skip over Reserved */
 311                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 312                 /* Skip over Obsolete field in RTPI payload
 313                  * in Table 472 */
 314                 off += 2;
 315                 put_unaligned_be16(lun->lun_tpg->tpg_rtpi, &buf[off]);
 316                 off += 2;
 317                 len += 8; /* Header size + Designation descriptor */
 318                 /*
 319                  * Target port group identifier, see spc4r17
 320                  * section 7.7.3.8
 321                  *
 322                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 323                  * section 7.5.1 Table 362
 324                  */
 325                 rcu_read_lock();
 326                 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp);
 327                 if (!tg_pt_gp) {
 328                         rcu_read_unlock();
 329                         goto check_lu_gp;
 330                 }
 331                 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 332                 rcu_read_unlock();
 333
 334                 buf[off] = tpg->proto_id << 4;
 335                 buf[off++] |= 0x1; /* CODE SET == Binary */
 336                 buf[off] = 0x80; /* Set PIV=1 */
 337                 /* Set ASSOCIATION == target port: 01b */
 338                 buf[off] |= 0x10;
 339                 /* DESIGNATOR TYPE == Target port group identifier */
 340                 buf[off++] |= 0x5;
 341                 off++; /* Skip over Reserved */
 342                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 343                 off += 2; /* Skip over Reserved Field */
 344                 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
 345                 off += 2;
 346                 len += 8; /* Header size + Designation descriptor */
 347                 /*
 348                  * Logical Unit Group identifier, see spc4r17
 349                  * section 7.7.3.8
 350                  */
 351 check_lu_gp:
 352                 lu_gp_mem = dev->dev_alua_lu_gp_mem;
 353                 if (!lu_gp_mem)
 354                         goto check_scsi_name;
 355
 356                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 357                 lu_gp = lu_gp_mem->lu_gp;
 358                 if (!lu_gp) {
 359                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 360                         goto check_scsi_name;
 361                 }
 362                 lu_gp_id = lu_gp->lu_gp_id;
 363                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 364
 365                 buf[off++] |= 0x1; /* CODE SET == Binary */
 366                 /* DESIGNATOR TYPE == Logical Unit Group identifier */
 367                 buf[off++] |= 0x6;
 368                 off++; /* Skip over Reserved */
 369                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 370                 off += 2; /* Skip over Reserved Field */
 371                 put_unaligned_be16(lu_gp_id, &buf[off]);
 372                 off += 2;
 373                 len += 8; /* Header size + Designation descriptor */
 374                 /*
 375                  * SCSI name string designator, see spc4r17
 376                  * section 7.7.3.11
 377                  *
 378                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 379                  * section 7.5.1 Table 362
 380                  */
 381 check_scsi_name:
 382                 buf[off] = tpg->proto_id << 4;
 383                 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 384                 buf[off] = 0x80; /* Set PIV=1 */
 385                 /* Set ASSOCIATION == target port: 01b */
 386                 buf[off] |= 0x10;
 387                 /* DESIGNATOR TYPE == SCSI name string */
 388                 buf[off++] |= 0x8;
 389                 off += 2; /* Skip over Reserved and length */
 390                 /*
 391                  * SCSI name string identifer containing, $FABRIC_MOD
 392                  * dependent information.  For LIO-Target and iSCSI
 393                  * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 394                  * UTF-8 encoding.
 395                  */
 396                 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 397                 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 398                                         tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 399                 scsi_name_len += 1 /* Include  NULL terminator */;
 400                 /*
 401                  * The null-terminated, null-padded (see 4.4.2) SCSI
 402                  * NAME STRING field contains a UTF-8 format string.
 403                  * The number of bytes in the SCSI NAME STRING field
 404                  * (i.e., the value in the DESIGNATOR LENGTH field)
 405                  * shall be no larger than 256 and shall be a multiple
 406                  * of four.
 407                  */
 408                 padding = ((-scsi_name_len) & 3);
 409                 if (padding)
 410                         scsi_name_len += padding;
 411                 if (scsi_name_len > 256)
 412                         scsi_name_len = 256;
 413
 414                 buf[off-1] = scsi_name_len;
 415                 off += scsi_name_len;
 416                 /* Header size + Designation descriptor */
 417                 len += (scsi_name_len + 4);
 418
 419                 /*
 420                  * Target device designator
 421                  */
 422                 buf[off] = tpg->proto_id << 4;
 423                 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 424                 buf[off] = 0x80; /* Set PIV=1 */
 425                 /* Set ASSOCIATION == target device: 10b */
 426                 buf[off] |= 0x20;
 427                 /* DESIGNATOR TYPE == SCSI name string */
 428                 buf[off++] |= 0x8;
 429                 off += 2; /* Skip over Reserved and length */
 430                 /*
 431                  * SCSI name string identifer containing, $FABRIC_MOD
 432                  * dependent information.  For LIO-Target and iSCSI
 433                  * Target Port, this means "<iSCSI name>" in
 434                  * UTF-8 encoding.
 435                  */
 436                 scsi_target_len = sprintf(&buf[off], "%s",
 437                                           tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 438                 scsi_target_len += 1 /* Include  NULL terminator */;
 439                 /*
 440                  * The null-terminated, null-padded (see 4.4.2) SCSI
 441                  * NAME STRING field contains a UTF-8 format string.
 442                  * The number of bytes in the SCSI NAME STRING field
 443                  * (i.e., the value in the DESIGNATOR LENGTH field)
 444                  * shall be no larger than 256 and shall be a multiple
 445                  * of four.
 446                  */
 447                 padding = ((-scsi_target_len) & 3);
 448                 if (padding)
 449                         scsi_target_len += padding;
 450                 if (scsi_target_len > 256)
 451                         scsi_target_len = 256;
 452
 453                 buf[off-1] = scsi_target_len;
 454                 off += scsi_target_len;
 455
 456                 /* Header size + Designation descriptor */
 457                 len += (scsi_target_len + 4);
 458         }
 459         put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
 460         return 0;
 461 }
 462 EXPORT_SYMBOL(spc_emulate_evpd_83);
 463
 464 /* Extended INQUIRY Data VPD Page */
 465 static sense_reason_t
 466 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 467 {
 468         struct se_device *dev = cmd->se_dev;
 469         struct se_session *sess = cmd->se_sess;
 470
 471         buf[3] = 0x3c;
 472         /*
 473          * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
 474          * only for TYPE3 protection.
 475          */
 476         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 477                 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
 478                     cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
 479                         buf[4] = 0x5;
 480                 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
 481                          cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
 482                         buf[4] = 0x4;
 483         }
 484
 485         /* logical unit supports type 1 and type 3 protection */
 486         if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
 487             (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
 488             (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
 489                 buf[4] |= (0x3 << 3);
 490         }
 491
 492         /* Set HEADSUP, ORDSUP, SIMPSUP */
 493         buf[5] = 0x07;
 494
 495         /* If WriteCache emulation is enabled, set V_SUP */
 496         if (target_check_wce(dev))
 497                 buf[6] = 0x01;
 498         /* If an LBA map is present set R_SUP */
 499         spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
 500         if (!list_empty(&dev->t10_alua.lba_map_list))
 501                 buf[8] = 0x10;
 502         spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
 503         return 0;
 504 }
 505
 506 /* Block Limits VPD page */
 507 static sense_reason_t
 508 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 509 {
 510         struct se_device *dev = cmd->se_dev;
 511         u32 mtl = 0;
 512         int have_tp = 0, opt, min;
 513         u32 io_max_blocks;
 514
 515         /*
 516          * Following spc3r22 section 6.5.3 Block Limits VPD page, when
 517          * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 518          * different page length for Thin Provisioning.
 519          */
 520         if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 521                 have_tp = 1;
 522
 523         buf[0] = dev->transport->get_device_type(dev);
 524         buf[3] = have_tp ? 0x3c : 0x10;
 525
 526         /* Set WSNZ to 1 */
 527         buf[4] = 0x01;
 528         /*
 529          * Set MAXIMUM COMPARE AND WRITE LENGTH
 530          */
 531         if (dev->dev_attrib.emulate_caw)
 532                 buf[5] = 0x01;
 533
 534         /*
 535          * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 536          */
 537         if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
 538                 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
 539         else
 540                 put_unaligned_be16(1, &buf[6]);
 541
 542         /*
 543          * Set MAXIMUM TRANSFER LENGTH
 544          *
 545          * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
 546          * enforcing maximum HW scatter-gather-list entry limit
 547          */
 548         if (cmd->se_tfo->max_data_sg_nents) {
 549                 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
 550                        dev->dev_attrib.block_size;
 551         }
 552         io_max_blocks = mult_frac(dev->dev_attrib.hw_max_sectors,
 553                         dev->dev_attrib.hw_block_size,
 554                         dev->dev_attrib.block_size);
 555         put_unaligned_be32(min_not_zero(mtl, io_max_blocks), &buf[8]);
 556
 557         /*
 558          * Set OPTIMAL TRANSFER LENGTH
 559          */
 560         if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
 561                 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
 562         else
 563                 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
 564
 565         /*
 566          * Exit now if we don't support TP.
 567          */
 568         if (!have_tp)
 569                 goto max_write_same;
 570
 571         /*
 572          * Set MAXIMUM UNMAP LBA COUNT
 573          */
 574         put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
 575
 576         /*
 577          * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 578          */
 579         put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
 580                            &buf[24]);
 581
 582         /*
 583          * Set OPTIMAL UNMAP GRANULARITY
 584          */
 585         put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
 586
 587         /*
 588          * UNMAP GRANULARITY ALIGNMENT
 589          */
 590         put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
 591                            &buf[32]);
 592         if (dev->dev_attrib.unmap_granularity_alignment != 0)
 593                 buf[32] |= 0x80; /* Set the UGAVALID bit */
 594
 595         /*
 596          * MAXIMUM WRITE SAME LENGTH
 597          */
 598 max_write_same:
 599         put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
 600
 601         return 0;
 602 }
 603
 604 /* Block Device Characteristics VPD page */
 605 static sense_reason_t
 606 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 607 {
 608         struct se_device *dev = cmd->se_dev;
 609
 610         buf[0] = dev->transport->get_device_type(dev);
 611         buf[3] = 0x3c;
 612         buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
 613
 614         return 0;
 615 }
 616
 617 /* Thin Provisioning VPD */
 618 static sense_reason_t
 619 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 620 {
 621         struct se_device *dev = cmd->se_dev;
 622
 623         /*
 624          * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
 625          *
 626          * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 627          * zero, then the page length shall be set to 0004h.  If the DP bit
 628          * is set to one, then the page length shall be set to the value
 629          * defined in table 162.
 630          */
 631         buf[0] = dev->transport->get_device_type(dev);
 632
 633         /*
 634          * Set Hardcoded length mentioned above for DP=0
 635          */
 636         put_unaligned_be16(0x0004, &buf[2]);
 637
 638         /*
 639          * The THRESHOLD EXPONENT field indicates the threshold set size in
 640          * LBAs as a power of 2 (i.e., the threshold set size is equal to
 641          * 2(threshold exponent)).
 642          *
 643          * Note that this is currently set to 0x00 as mkp says it will be
 644          * changing again.  We can enable this once it has settled in T10
 645          * and is actually used by Linux/SCSI ML code.
 646          */
 647         buf[4] = 0x00;
 648
 649         /*
 650          * A TPU bit set to one indicates that the device server supports
 651          * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 652          * that the device server does not support the UNMAP command.
 653          */
 654         if (dev->dev_attrib.emulate_tpu != 0)
 655                 buf[5] = 0x80;
 656
 657         /*
 658          * A TPWS bit set to one indicates that the device server supports
 659          * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 660          * A TPWS bit set to zero indicates that the device server does not
 661          * support the use of the WRITE SAME (16) command to unmap LBAs.
 662          */
 663         if (dev->dev_attrib.emulate_tpws != 0)
 664                 buf[5] |= 0x40 | 0x20;
 665
 666         /*
 667          * The unmap_zeroes_data set means that the underlying device supports
 668          * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
 669          * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
 670          * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
 671          * See sbc4r36 6.6.4.
 672          */
 673         if (((dev->dev_attrib.emulate_tpu != 0) ||
 674              (dev->dev_attrib.emulate_tpws != 0)) &&
 675              (dev->dev_attrib.unmap_zeroes_data != 0))
 676                 buf[5] |= 0x04;
 677
 678         return 0;
 679 }
 680
 681 /* Referrals VPD page */
 682 static sense_reason_t
 683 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
 684 {
 685         struct se_device *dev = cmd->se_dev;
 686
 687         buf[0] = dev->transport->get_device_type(dev);
 688         buf[3] = 0x0c;
 689         put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
 690         put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
 691
 692         return 0;
 693 }
 694
 695 static sense_reason_t
 696 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 697
 698 static struct {
 699         uint8_t         page;
 700         sense_reason_t  (*emulate)(struct se_cmd *, unsigned char *);
 701 } evpd_handlers[] = {
 702         { .page = 0x00, .emulate = spc_emulate_evpd_00 },
 703         { .page = 0x80, .emulate = spc_emulate_evpd_80 },
 704         { .page = 0x83, .emulate = spc_emulate_evpd_83 },
 705         { .page = 0x86, .emulate = spc_emulate_evpd_86 },
 706         { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
 707         { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
 708         { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
 709         { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
 710 };
 711
 712 /* supported vital product data pages */
 713 static sense_reason_t
 714 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 715 {
 716         int p;
 717
 718         /*
 719          * Only report the INQUIRY EVPD=1 pages after a valid NAA
 720          * Registered Extended LUN WWN has been set via ConfigFS
 721          * during device creation/restart.
 722          */
 723         if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 724                 buf[3] = ARRAY_SIZE(evpd_handlers);
 725                 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
 726                         buf[p + 4] = evpd_handlers[p].page;
 727         }
 728
 729         return 0;
 730 }
 731
 732 static sense_reason_t
 733 spc_emulate_inquiry(struct se_cmd *cmd)
 734 {
 735         struct se_device *dev = cmd->se_dev;
 736         unsigned char *rbuf;
 737         unsigned char *cdb = cmd->t_task_cdb;
 738         unsigned char *buf;
 739         sense_reason_t ret;
 740         int p;
 741         int len = 0;
 742
 743         buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
 744         if (!buf) {
 745                 pr_err("Unable to allocate response buffer for INQUIRY\n");
 746                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 747         }
 748
 749         buf[0] = dev->transport->get_device_type(dev);
 750
 751         if (!(cdb[1] & 0x1)) {
 752                 if (cdb[2]) {
 753                         pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
 754                                cdb[2]);
 755                         ret = TCM_INVALID_CDB_FIELD;
 756                         goto out;
 757                 }
 758
 759                 ret = spc_emulate_inquiry_std(cmd, buf);
 760                 len = buf[4] + 5;
 761                 goto out;
 762         }
 763
 764         for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
 765                 if (cdb[2] == evpd_handlers[p].page) {
 766                         buf[1] = cdb[2];
 767                         ret = evpd_handlers[p].emulate(cmd, buf);
 768                         len = get_unaligned_be16(&buf[2]) + 4;
 769                         goto out;
 770                 }
 771         }
 772
 773         pr_debug("Unknown VPD Code: 0x%02x\n", cdb[2]);
 774         ret = TCM_INVALID_CDB_FIELD;
 775
 776 out:
 777         rbuf = transport_kmap_data_sg(cmd);
 778         if (rbuf) {
 779                 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
 780                 transport_kunmap_data_sg(cmd);
 781         }
 782         kfree(buf);
 783
 784         if (!ret)
 785                 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len);
 786         return ret;
 787 }
 788
 789 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
 790 {
 791         p[0] = 0x01;
 792         p[1] = 0x0a;
 793
 794         /* No changeable values for now */
 795         if (pc == 1)
 796                 goto out;
 797
 798 out:
 799         return 12;
 800 }
 801
 802 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
 803 {
 804         struct se_device *dev = cmd->se_dev;
 805         struct se_session *sess = cmd->se_sess;
 806
 807         p[0] = 0x0a;
 808         p[1] = 0x0a;
 809
 810         /* No changeable values for now */
 811         if (pc == 1)
 812                 goto out;
 813
 814         /* GLTSD: No implicit save of log parameters */
 815         p[2] = (1 << 1);
 816         if (target_sense_desc_format(dev))
 817                 /* D_SENSE: Descriptor format sense data for 64bit sectors */
 818                 p[2] |= (1 << 2);
 819
 820         /*
 821          * From spc4r23, 7.4.7 Control mode page
 822          *
 823          * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
 824          * restrictions on the algorithm used for reordering commands
 825          * having the SIMPLE task attribute (see SAM-4).
 826          *
 827          *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
 828          *                         Code      Description
 829          *                          0h       Restricted reordering
 830          *                          1h       Unrestricted reordering allowed
 831          *                          2h to 7h    Reserved
 832          *                          8h to Fh    Vendor specific
 833          *
 834          * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
 835          * the device server shall order the processing sequence of commands
 836          * having the SIMPLE task attribute such that data integrity is maintained
 837          * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
 838          * requests is halted at any time, the final value of all data observable
 839          * on the medium shall be the same as if all the commands had been processed
 840          * with the ORDERED task attribute).
 841          *
 842          * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
 843          * device server may reorder the processing sequence of commands having the
 844          * SIMPLE task attribute in any manner. Any data integrity exposures related to
 845          * command sequence order shall be explicitly handled by the application client
 846          * through the selection of appropriate ommands and task attributes.
 847          */
 848         p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
 849         /*
 850          * From spc4r17, section 7.4.6 Control mode Page
 851          *
 852          * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 853          *
 854          * 00b: The logical unit shall clear any unit attention condition
 855          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 856          * status and shall not establish a unit attention condition when a com-
 857          * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 858          * status.
 859          *
 860          * 10b: The logical unit shall not clear any unit attention condition
 861          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 862          * status and shall not establish a unit attention condition when
 863          * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 864          * CONFLICT status.
 865          *
 866          * 11b a The logical unit shall not clear any unit attention condition
 867          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 868          * status and shall establish a unit attention condition for the
 869          * initiator port associated with the I_T nexus on which the BUSY,
 870          * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 871          * Depending on the status, the additional sense code shall be set to
 872          * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 873          * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 874          * command, a unit attention condition shall be established only once
 875          * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 876          * to the number of commands completed with one of those status codes.
 877          */
 878         switch (dev->dev_attrib.emulate_ua_intlck_ctrl) {
 879         case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA:
 880                 p[4] = 0x30;
 881                 break;
 882         case TARGET_UA_INTLCK_CTRL_NO_CLEAR:
 883                 p[4] = 0x20;
 884                 break;
 885         default:        /* TARGET_UA_INTLCK_CTRL_CLEAR */
 886                 p[4] = 0x00;
 887                 break;
 888         }
 889         /*
 890          * From spc4r17, section 7.4.6 Control mode Page
 891          *
 892          * Task Aborted Status (TAS) bit set to zero.
 893          *
 894          * A task aborted status (TAS) bit set to zero specifies that aborted
 895          * tasks shall be terminated by the device server without any response
 896          * to the application client. A TAS bit set to one specifies that tasks
 897          * aborted by the actions of an I_T nexus other than the I_T nexus on
 898          * which the command was received shall be completed with TASK ABORTED
 899          * status (see SAM-4).
 900          */
 901         p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
 902         /*
 903          * From spc4r30, section 7.5.7 Control mode page
 904          *
 905          * Application Tag Owner (ATO) bit set to one.
 906          *
 907          * If the ATO bit is set to one the device server shall not modify the
 908          * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
 909          * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
 910          * TAG field.
 911          */
 912         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 913                 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
 914                         p[5] |= 0x80;
 915         }
 916
 917         p[8] = 0xff;
 918         p[9] = 0xff;
 919         p[11] = 30;
 920
 921 out:
 922         return 12;
 923 }
 924
 925 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
 926 {
 927         struct se_device *dev = cmd->se_dev;
 928
 929         p[0] = 0x08;
 930         p[1] = 0x12;
 931
 932         /* No changeable values for now */
 933         if (pc == 1)
 934                 goto out;
 935
 936         if (target_check_wce(dev))
 937                 p[2] = 0x04; /* Write Cache Enable */
 938         p[12] = 0x20; /* Disabled Read Ahead */
 939
 940 out:
 941         return 20;
 942 }
 943
 944 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
 945 {
 946         p[0] = 0x1c;
 947         p[1] = 0x0a;
 948
 949         /* No changeable values for now */
 950         if (pc == 1)
 951                 goto out;
 952
 953 out:
 954         return 12;
 955 }
 956
 957 static struct {
 958         uint8_t         page;
 959         uint8_t         subpage;
 960         int             (*emulate)(struct se_cmd *, u8, unsigned char *);
 961 } modesense_handlers[] = {
 962         { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
 963         { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
 964         { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
 965         { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
 966 };
 967
 968 static void spc_modesense_write_protect(unsigned char *buf, int type)
 969 {
 970         /*
 971          * I believe that the WP bit (bit 7) in the mode header is the same for
 972          * all device types..
 973          */
 974         switch (type) {
 975         case TYPE_DISK:
 976         case TYPE_TAPE:
 977         default:
 978                 buf[0] |= 0x80; /* WP bit */
 979                 break;
 980         }
 981 }
 982
 983 static void spc_modesense_dpofua(unsigned char *buf, int type)
 984 {
 985         switch (type) {
 986         case TYPE_DISK:
 987                 buf[0] |= 0x10; /* DPOFUA bit */
 988                 break;
 989         default:
 990                 break;
 991         }
 992 }
 993
 994 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 995 {
 996         *buf++ = 8;
 997         put_unaligned_be32(min(blocks, 0xffffffffull), buf);
 998         buf += 4;
 999         put_unaligned_be32(block_size, buf);
1000         return 9;
1001 }
1002
1003 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
1004 {
1005         if (blocks <= 0xffffffff)
1006                 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
1007
1008         *buf++ = 1;             /* LONGLBA */
1009         buf += 2;
1010         *buf++ = 16;
1011         put_unaligned_be64(blocks, buf);
1012         buf += 12;
1013         put_unaligned_be32(block_size, buf);
1014
1015         return 17;
1016 }
1017
1018 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
1019 {
1020         struct se_device *dev = cmd->se_dev;
1021         char *cdb = cmd->t_task_cdb;
1022         unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
1023         int type = dev->transport->get_device_type(dev);
1024         int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
1025         bool dbd = !!(cdb[1] & 0x08);
1026         bool llba = ten ? !!(cdb[1] & 0x10) : false;
1027         u8 pc = cdb[2] >> 6;
1028         u8 page = cdb[2] & 0x3f;
1029         u8 subpage = cdb[3];
1030         int length = 0;
1031         int ret;
1032         int i;
1033
1034         memset(buf, 0, SE_MODE_PAGE_BUF);
1035
1036         /*
1037          * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1038          * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1039          */
1040         length = ten ? 3 : 2;
1041
1042         /* DEVICE-SPECIFIC PARAMETER */
1043         if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1044                 spc_modesense_write_protect(&buf[length], type);
1045
1046         /*
1047          * SBC only allows us to enable FUA and DPO together.  Fortunately
1048          * DPO is explicitly specified as a hint, so a noop is a perfectly
1049          * valid implementation.
1050          */
1051         if (target_check_fua(dev))
1052                 spc_modesense_dpofua(&buf[length], type);
1053
1054         ++length;
1055
1056         /* BLOCK DESCRIPTOR */
1057
1058         /*
1059          * For now we only include a block descriptor for disk (SBC)
1060          * devices; other command sets use a slightly different format.
1061          */
1062         if (!dbd && type == TYPE_DISK) {
1063                 u64 blocks = dev->transport->get_blocks(dev);
1064                 u32 block_size = dev->dev_attrib.block_size;
1065
1066                 if (ten) {
1067                         if (llba) {
1068                                 length += spc_modesense_long_blockdesc(&buf[length],
1069                                                                        blocks, block_size);
1070                         } else {
1071                                 length += 3;
1072                                 length += spc_modesense_blockdesc(&buf[length],
1073                                                                   blocks, block_size);
1074                         }
1075                 } else {
1076                         length += spc_modesense_blockdesc(&buf[length], blocks,
1077                                                           block_size);
1078                 }
1079         } else {
1080                 if (ten)
1081                         length += 4;
1082                 else
1083                         length += 1;
1084         }
1085
1086         if (page == 0x3f) {
1087                 if (subpage != 0x00 && subpage != 0xff) {
1088                         pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1089                         return TCM_INVALID_CDB_FIELD;
1090                 }
1091
1092                 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1093                         /*
1094                          * Tricky way to say all subpage 00h for
1095                          * subpage==0, all subpages for subpage==0xff
1096                          * (and we just checked above that those are
1097                          * the only two possibilities).
1098                          */
1099                         if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1100                                 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1101                                 if (!ten && length + ret >= 255)
1102                                         break;
1103                                 length += ret;
1104                         }
1105                 }
1106
1107                 goto set_length;
1108         }
1109
1110         for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1111                 if (modesense_handlers[i].page == page &&
1112                     modesense_handlers[i].subpage == subpage) {
1113                         length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1114                         goto set_length;
1115                 }
1116
1117         /*
1118          * We don't intend to implement:
1119          *  - obsolete page 03h "format parameters" (checked by Solaris)
1120          */
1121         if (page != 0x03)
1122                 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1123                        page, subpage);
1124
1125         return TCM_UNKNOWN_MODE_PAGE;
1126
1127 set_length:
1128         if (ten)
1129                 put_unaligned_be16(length - 2, buf);
1130         else
1131                 buf[0] = length - 1;
1132
1133         rbuf = transport_kmap_data_sg(cmd);
1134         if (rbuf) {
1135                 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1136                 transport_kunmap_data_sg(cmd);
1137         }
1138
1139         target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length);
1140         return 0;
1141 }
1142
1143 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1144 {
1145         char *cdb = cmd->t_task_cdb;
1146         bool ten = cdb[0] == MODE_SELECT_10;
1147         int off = ten ? 8 : 4;
1148         bool pf = !!(cdb[1] & 0x10);
1149         u8 page, subpage;
1150         unsigned char *buf;
1151         unsigned char tbuf[SE_MODE_PAGE_BUF];
1152         int length;
1153         sense_reason_t ret = 0;
1154         int i;
1155
1156         if (!cmd->data_length) {
1157                 target_complete_cmd(cmd, SAM_STAT_GOOD);
1158                 return 0;
1159         }
1160
1161         if (cmd->data_length < off + 2)
1162                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1163
1164         buf = transport_kmap_data_sg(cmd);
1165         if (!buf)
1166                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1167
1168         if (!pf) {
1169                 ret = TCM_INVALID_CDB_FIELD;
1170                 goto out;
1171         }
1172
1173         page = buf[off] & 0x3f;
1174         subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1175
1176         for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1177                 if (modesense_handlers[i].page == page &&
1178                     modesense_handlers[i].subpage == subpage) {
1179                         memset(tbuf, 0, SE_MODE_PAGE_BUF);
1180                         length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1181                         goto check_contents;
1182                 }
1183
1184         ret = TCM_UNKNOWN_MODE_PAGE;
1185         goto out;
1186
1187 check_contents:
1188         if (cmd->data_length < off + length) {
1189                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1190                 goto out;
1191         }
1192
1193         if (memcmp(buf + off, tbuf, length))
1194                 ret = TCM_INVALID_PARAMETER_LIST;
1195
1196 out:
1197         transport_kunmap_data_sg(cmd);
1198
1199         if (!ret)
1200                 target_complete_cmd(cmd, SAM_STAT_GOOD);
1201         return ret;
1202 }
1203
1204 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1205 {
1206         unsigned char *cdb = cmd->t_task_cdb;
1207         unsigned char *rbuf;
1208         u8 ua_asc = 0, ua_ascq = 0;
1209         unsigned char buf[SE_SENSE_BUF];
1210         bool desc_format = target_sense_desc_format(cmd->se_dev);
1211
1212         memset(buf, 0, SE_SENSE_BUF);
1213
1214         if (cdb[1] & 0x01) {
1215                 pr_err("REQUEST_SENSE description emulation not"
1216                         " supported\n");
1217                 return TCM_INVALID_CDB_FIELD;
1218         }
1219
1220         rbuf = transport_kmap_data_sg(cmd);
1221         if (!rbuf)
1222                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1223
1224         if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1225                 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1226                                         ua_asc, ua_ascq);
1227         else
1228                 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1229
1230         memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1231         transport_kunmap_data_sg(cmd);
1232
1233         target_complete_cmd(cmd, SAM_STAT_GOOD);
1234         return 0;
1235 }
1236
1237 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1238 {
1239         struct se_dev_entry *deve;
1240         struct se_session *sess = cmd->se_sess;
1241         struct se_node_acl *nacl;
1242         struct scsi_lun slun;
1243         unsigned char *buf;
1244         u32 lun_count = 0, offset = 8;
1245         __be32 len;
1246
1247         buf = transport_kmap_data_sg(cmd);
1248         if (cmd->data_length && !buf)
1249                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1250
1251         /*
1252          * If no struct se_session pointer is present, this struct se_cmd is
1253          * coming via a target_core_mod PASSTHROUGH op, and not through
1254          * a $FABRIC_MOD.  In that case, report LUN=0 only.
1255          */
1256         if (!sess)
1257                 goto done;
1258
1259         nacl = sess->se_node_acl;
1260
1261         rcu_read_lock();
1262         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1263                 /*
1264                  * We determine the correct LUN LIST LENGTH even once we
1265                  * have reached the initial allocation length.
1266                  * See SPC2-R20 7.19.
1267                  */
1268                 lun_count++;
1269                 if (offset >= cmd->data_length)
1270                         continue;
1271
1272                 int_to_scsilun(deve->mapped_lun, &slun);
1273                 memcpy(buf + offset, &slun,
1274                        min(8u, cmd->data_length - offset));
1275                 offset += 8;
1276         }
1277         rcu_read_unlock();
1278
1279         /*
1280          * See SPC3 r07, page 159.
1281          */
1282 done:
1283         /*
1284          * If no LUNs are accessible, report virtual LUN 0.
1285          */
1286         if (lun_count == 0) {
1287                 int_to_scsilun(0, &slun);
1288                 if (cmd->data_length > 8)
1289                         memcpy(buf + offset, &slun,
1290                                min(8u, cmd->data_length - offset));
1291                 lun_count = 1;
1292         }
1293
1294         if (buf) {
1295                 len = cpu_to_be32(lun_count * 8);
1296                 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1297                 transport_kunmap_data_sg(cmd);
1298         }
1299
1300         target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8);
1301         return 0;
1302 }
1303 EXPORT_SYMBOL(spc_emulate_report_luns);
1304
1305 static sense_reason_t
1306 spc_emulate_testunitready(struct se_cmd *cmd)
1307 {
1308         target_complete_cmd(cmd, SAM_STAT_GOOD);
1309         return 0;
1310 }
1311
1312 static void set_dpofua_usage_bits(u8 *usage_bits, struct se_device *dev)
1313 {
1314         if (!target_check_fua(dev))
1315                 usage_bits[1] &= ~0x18;
1316         else
1317                 usage_bits[1] |= 0x18;
1318 }
1319
1320 static void set_dpofua_usage_bits32(u8 *usage_bits, struct se_device *dev)
1321 {
1322         if (!target_check_fua(dev))
1323                 usage_bits[10] &= ~0x18;
1324         else
1325                 usage_bits[10] |= 0x18;
1326 }
1327
1328 static struct target_opcode_descriptor tcm_opcode_read6 = {
1329         .support = SCSI_SUPPORT_FULL,
1330         .opcode = READ_6,
1331         .cdb_size = 6,
1332         .usage_bits = {READ_6, 0x1f, 0xff, 0xff,
1333                        0xff, SCSI_CONTROL_MASK},
1334 };
1335
1336 static struct target_opcode_descriptor tcm_opcode_read10 = {
1337         .support = SCSI_SUPPORT_FULL,
1338         .opcode = READ_10,
1339         .cdb_size = 10,
1340         .usage_bits = {READ_10, 0xf8, 0xff, 0xff,
1341                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1342                        0xff, SCSI_CONTROL_MASK},
1343         .update_usage_bits = set_dpofua_usage_bits,
1344 };
1345
1346 static struct target_opcode_descriptor tcm_opcode_read12 = {
1347         .support = SCSI_SUPPORT_FULL,
1348         .opcode = READ_12,
1349         .cdb_size = 12,
1350         .usage_bits = {READ_12, 0xf8, 0xff, 0xff,
1351                        0xff, 0xff, 0xff, 0xff,
1352                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1353         .update_usage_bits = set_dpofua_usage_bits,
1354 };
1355
1356 static struct target_opcode_descriptor tcm_opcode_read16 = {
1357         .support = SCSI_SUPPORT_FULL,
1358         .opcode = READ_16,
1359         .cdb_size = 16,
1360         .usage_bits = {READ_16, 0xf8, 0xff, 0xff,
1361                        0xff, 0xff, 0xff, 0xff,
1362                        0xff, 0xff, 0xff, 0xff,
1363                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1364         .update_usage_bits = set_dpofua_usage_bits,
1365 };
1366
1367 static struct target_opcode_descriptor tcm_opcode_write6 = {
1368         .support = SCSI_SUPPORT_FULL,
1369         .opcode = WRITE_6,
1370         .cdb_size = 6,
1371         .usage_bits = {WRITE_6, 0x1f, 0xff, 0xff,
1372                        0xff, SCSI_CONTROL_MASK},
1373 };
1374
1375 static struct target_opcode_descriptor tcm_opcode_write10 = {
1376         .support = SCSI_SUPPORT_FULL,
1377         .opcode = WRITE_10,
1378         .cdb_size = 10,
1379         .usage_bits = {WRITE_10, 0xf8, 0xff, 0xff,
1380                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1381                        0xff, SCSI_CONTROL_MASK},
1382         .update_usage_bits = set_dpofua_usage_bits,
1383 };
1384
1385 static struct target_opcode_descriptor tcm_opcode_write_verify10 = {
1386         .support = SCSI_SUPPORT_FULL,
1387         .opcode = WRITE_VERIFY,
1388         .cdb_size = 10,
1389         .usage_bits = {WRITE_VERIFY, 0xf0, 0xff, 0xff,
1390                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1391                        0xff, SCSI_CONTROL_MASK},
1392         .update_usage_bits = set_dpofua_usage_bits,
1393 };
1394
1395 static struct target_opcode_descriptor tcm_opcode_write12 = {
1396         .support = SCSI_SUPPORT_FULL,
1397         .opcode = WRITE_12,
1398         .cdb_size = 12,
1399         .usage_bits = {WRITE_12, 0xf8, 0xff, 0xff,
1400                        0xff, 0xff, 0xff, 0xff,
1401                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1402         .update_usage_bits = set_dpofua_usage_bits,
1403 };
1404
1405 static struct target_opcode_descriptor tcm_opcode_write16 = {
1406         .support = SCSI_SUPPORT_FULL,
1407         .opcode = WRITE_16,
1408         .cdb_size = 16,
1409         .usage_bits = {WRITE_16, 0xf8, 0xff, 0xff,
1410                        0xff, 0xff, 0xff, 0xff,
1411                        0xff, 0xff, 0xff, 0xff,
1412                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1413         .update_usage_bits = set_dpofua_usage_bits,
1414 };
1415
1416 static struct target_opcode_descriptor tcm_opcode_write_verify16 = {
1417         .support = SCSI_SUPPORT_FULL,
1418         .opcode = WRITE_VERIFY_16,
1419         .cdb_size = 16,
1420         .usage_bits = {WRITE_VERIFY_16, 0xf0, 0xff, 0xff,
1421                        0xff, 0xff, 0xff, 0xff,
1422                        0xff, 0xff, 0xff, 0xff,
1423                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1424         .update_usage_bits = set_dpofua_usage_bits,
1425 };
1426
1427 static bool tcm_is_ws_enabled(struct target_opcode_descriptor *descr,
1428                               struct se_cmd *cmd)
1429 {
1430         struct exec_cmd_ops *ops = cmd->protocol_data;
1431         struct se_device *dev = cmd->se_dev;
1432
1433         return (dev->dev_attrib.emulate_tpws && !!ops->execute_unmap) ||
1434                !!ops->execute_write_same;
1435 }
1436
1437 static struct target_opcode_descriptor tcm_opcode_write_same32 = {
1438         .support = SCSI_SUPPORT_FULL,
1439         .serv_action_valid = 1,
1440         .opcode = VARIABLE_LENGTH_CMD,
1441         .service_action = WRITE_SAME_32,
1442         .cdb_size = 32,
1443         .usage_bits = {VARIABLE_LENGTH_CMD, SCSI_CONTROL_MASK, 0x00, 0x00,
1444                        0x00, 0x00, SCSI_GROUP_NUMBER_MASK, 0x18,
1445                        0x00, WRITE_SAME_32, 0xe8, 0x00,
1446                        0xff, 0xff, 0xff, 0xff,
1447                        0xff, 0xff, 0xff, 0xff,
1448                        0x00, 0x00, 0x00, 0x00,
1449                        0x00, 0x00, 0x00, 0x00,
1450                        0xff, 0xff, 0xff, 0xff},
1451         .enabled = tcm_is_ws_enabled,
1452         .update_usage_bits = set_dpofua_usage_bits32,
1453 };
1454
1455 static bool tcm_is_caw_enabled(struct target_opcode_descriptor *descr,
1456                                struct se_cmd *cmd)
1457 {
1458         struct se_device *dev = cmd->se_dev;
1459
1460         return dev->dev_attrib.emulate_caw;
1461 }
1462
1463 static struct target_opcode_descriptor tcm_opcode_compare_write = {
1464         .support = SCSI_SUPPORT_FULL,
1465         .opcode = COMPARE_AND_WRITE,
1466         .cdb_size = 16,
1467         .usage_bits = {COMPARE_AND_WRITE, 0x18, 0xff, 0xff,
1468                        0xff, 0xff, 0xff, 0xff,
1469                        0xff, 0xff, 0x00, 0x00,
1470                        0x00, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1471         .enabled = tcm_is_caw_enabled,
1472         .update_usage_bits = set_dpofua_usage_bits,
1473 };
1474
1475 static struct target_opcode_descriptor tcm_opcode_read_capacity = {
1476         .support = SCSI_SUPPORT_FULL,
1477         .opcode = READ_CAPACITY,
1478         .cdb_size = 10,
1479         .usage_bits = {READ_CAPACITY, 0x00, 0xff, 0xff,
1480                        0xff, 0xff, 0x00, 0x00,
1481                        0x01, SCSI_CONTROL_MASK},
1482 };
1483
1484 static struct target_opcode_descriptor tcm_opcode_read_capacity16 = {
1485         .support = SCSI_SUPPORT_FULL,
1486         .serv_action_valid = 1,
1487         .opcode = SERVICE_ACTION_IN_16,
1488         .service_action = SAI_READ_CAPACITY_16,
1489         .cdb_size = 16,
1490         .usage_bits = {SERVICE_ACTION_IN_16, SAI_READ_CAPACITY_16, 0x00, 0x00,
1491                        0x00, 0x00, 0x00, 0x00,
1492                        0x00, 0x00, 0xff, 0xff,
1493                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1494 };
1495
1496 static bool tcm_is_rep_ref_enabled(struct target_opcode_descriptor *descr,
1497                                    struct se_cmd *cmd)
1498 {
1499         struct se_device *dev = cmd->se_dev;
1500
1501         spin_lock(&dev->t10_alua.lba_map_lock);
1502         if (list_empty(&dev->t10_alua.lba_map_list)) {
1503                 spin_unlock(&dev->t10_alua.lba_map_lock);
1504                 return false;
1505         }
1506         spin_unlock(&dev->t10_alua.lba_map_lock);
1507         return true;
1508 }
1509
1510 static struct target_opcode_descriptor tcm_opcode_read_report_refferals = {
1511         .support = SCSI_SUPPORT_FULL,
1512         .serv_action_valid = 1,
1513         .opcode = SERVICE_ACTION_IN_16,
1514         .service_action = SAI_REPORT_REFERRALS,
1515         .cdb_size = 16,
1516         .usage_bits = {SERVICE_ACTION_IN_16, SAI_REPORT_REFERRALS, 0x00, 0x00,
1517                        0x00, 0x00, 0x00, 0x00,
1518                        0x00, 0x00, 0xff, 0xff,
1519                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1520         .enabled = tcm_is_rep_ref_enabled,
1521 };
1522
1523 static struct target_opcode_descriptor tcm_opcode_sync_cache = {
1524         .support = SCSI_SUPPORT_FULL,
1525         .opcode = SYNCHRONIZE_CACHE,
1526         .cdb_size = 10,
1527         .usage_bits = {SYNCHRONIZE_CACHE, 0x02, 0xff, 0xff,
1528                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1529                        0xff, SCSI_CONTROL_MASK},
1530 };
1531
1532 static struct target_opcode_descriptor tcm_opcode_sync_cache16 = {
1533         .support = SCSI_SUPPORT_FULL,
1534         .opcode = SYNCHRONIZE_CACHE_16,
1535         .cdb_size = 16,
1536         .usage_bits = {SYNCHRONIZE_CACHE_16, 0x02, 0xff, 0xff,
1537                        0xff, 0xff, 0xff, 0xff,
1538                        0xff, 0xff, 0xff, 0xff,
1539                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1540 };
1541
1542 static bool tcm_is_unmap_enabled(struct target_opcode_descriptor *descr,
1543                                  struct se_cmd *cmd)
1544 {
1545         struct exec_cmd_ops *ops = cmd->protocol_data;
1546         struct se_device *dev = cmd->se_dev;
1547
1548         return ops->execute_unmap && dev->dev_attrib.emulate_tpu;
1549 }
1550
1551 static struct target_opcode_descriptor tcm_opcode_unmap = {
1552         .support = SCSI_SUPPORT_FULL,
1553         .opcode = UNMAP,
1554         .cdb_size = 10,
1555         .usage_bits = {UNMAP, 0x00, 0x00, 0x00,
1556                        0x00, 0x00, SCSI_GROUP_NUMBER_MASK, 0xff,
1557                        0xff, SCSI_CONTROL_MASK},
1558         .enabled = tcm_is_unmap_enabled,
1559 };
1560
1561 static struct target_opcode_descriptor tcm_opcode_write_same = {
1562         .support = SCSI_SUPPORT_FULL,
1563         .opcode = WRITE_SAME,
1564         .cdb_size = 10,
1565         .usage_bits = {WRITE_SAME, 0xe8, 0xff, 0xff,
1566                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1567                        0xff, SCSI_CONTROL_MASK},
1568         .enabled = tcm_is_ws_enabled,
1569 };
1570
1571 static struct target_opcode_descriptor tcm_opcode_write_same16 = {
1572         .support = SCSI_SUPPORT_FULL,
1573         .opcode = WRITE_SAME_16,
1574         .cdb_size = 16,
1575         .usage_bits = {WRITE_SAME_16, 0xe8, 0xff, 0xff,
1576                        0xff, 0xff, 0xff, 0xff,
1577                        0xff, 0xff, 0xff, 0xff,
1578                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1579         .enabled = tcm_is_ws_enabled,
1580 };
1581
1582 static struct target_opcode_descriptor tcm_opcode_verify = {
1583         .support = SCSI_SUPPORT_FULL,
1584         .opcode = VERIFY,
1585         .cdb_size = 10,
1586         .usage_bits = {VERIFY, 0x00, 0xff, 0xff,
1587                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
1588                        0xff, SCSI_CONTROL_MASK},
1589 };
1590
1591 static struct target_opcode_descriptor tcm_opcode_verify16 = {
1592         .support = SCSI_SUPPORT_FULL,
1593         .opcode = VERIFY_16,
1594         .cdb_size = 16,
1595         .usage_bits = {VERIFY_16, 0x00, 0xff, 0xff,
1596                        0xff, 0xff, 0xff, 0xff,
1597                        0xff, 0xff, 0xff, 0xff,
1598                        0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
1599 };
1600
1601 static struct target_opcode_descriptor tcm_opcode_start_stop = {
1602         .support = SCSI_SUPPORT_FULL,
1603         .opcode = START_STOP,
1604         .cdb_size = 6,
1605         .usage_bits = {START_STOP, 0x01, 0x00, 0x00,
1606                        0x01, SCSI_CONTROL_MASK},
1607 };
1608
1609 static struct target_opcode_descriptor tcm_opcode_mode_select = {
1610         .support = SCSI_SUPPORT_FULL,
1611         .opcode = MODE_SELECT,
1612         .cdb_size = 6,
1613         .usage_bits = {MODE_SELECT, 0x10, 0x00, 0x00,
1614                        0xff, SCSI_CONTROL_MASK},
1615 };
1616
1617 static struct target_opcode_descriptor tcm_opcode_mode_select10 = {
1618         .support = SCSI_SUPPORT_FULL,
1619         .opcode = MODE_SELECT_10,
1620         .cdb_size = 10,
1621         .usage_bits = {MODE_SELECT_10, 0x10, 0x00, 0x00,
1622                        0x00, 0x00, 0x00, 0xff,
1623                        0xff, SCSI_CONTROL_MASK},
1624 };
1625
1626 static struct target_opcode_descriptor tcm_opcode_mode_sense = {
1627         .support = SCSI_SUPPORT_FULL,
1628         .opcode = MODE_SENSE,
1629         .cdb_size = 6,
1630         .usage_bits = {MODE_SENSE, 0x08, 0xff, 0xff,
1631                        0xff, SCSI_CONTROL_MASK},
1632 };
1633
1634 static struct target_opcode_descriptor tcm_opcode_mode_sense10 = {
1635         .support = SCSI_SUPPORT_FULL,
1636         .opcode = MODE_SENSE_10,
1637         .cdb_size = 10,
1638         .usage_bits = {MODE_SENSE_10, 0x18, 0xff, 0xff,
1639                        0x00, 0x00, 0x00, 0xff,
1640                        0xff, SCSI_CONTROL_MASK},
1641 };
1642
1643 static struct target_opcode_descriptor tcm_opcode_pri_read_keys = {
1644         .support = SCSI_SUPPORT_FULL,
1645         .serv_action_valid = 1,
1646         .opcode = PERSISTENT_RESERVE_IN,
1647         .service_action = PRI_READ_KEYS,
1648         .cdb_size = 10,
1649         .usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_KEYS, 0x00, 0x00,
1650                        0x00, 0x00, 0x00, 0xff,
1651                        0xff, SCSI_CONTROL_MASK},
1652 };
1653
1654 static struct target_opcode_descriptor tcm_opcode_pri_read_resrv = {
1655         .support = SCSI_SUPPORT_FULL,
1656         .serv_action_valid = 1,
1657         .opcode = PERSISTENT_RESERVE_IN,
1658         .service_action = PRI_READ_RESERVATION,
1659         .cdb_size = 10,
1660         .usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_RESERVATION, 0x00, 0x00,
1661                        0x00, 0x00, 0x00, 0xff,
1662                        0xff, SCSI_CONTROL_MASK},
1663 };
1664
1665 static bool tcm_is_pr_enabled(struct target_opcode_descriptor *descr,
1666                               struct se_cmd *cmd)
1667 {
1668         struct se_device *dev = cmd->se_dev;
1669
1670         if (!dev->dev_attrib.emulate_pr)
1671                 return false;
1672
1673         if (!(dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR))
1674                 return true;
1675
1676         switch (descr->opcode) {
1677         case RESERVE:
1678         case RESERVE_10:
1679         case RELEASE:
1680         case RELEASE_10:
1681                 /*
1682                  * The pr_ops which are used by the backend modules don't
1683                  * support these commands.
1684                  */
1685                 return false;
1686         case PERSISTENT_RESERVE_OUT:
1687                 switch (descr->service_action) {
1688                 case PRO_REGISTER_AND_MOVE:
1689                 case PRO_REPLACE_LOST_RESERVATION:
1690                         /*
1691                          * The backend modules don't have access to ports and
1692                          * I_T nexuses so they can't handle these type of
1693                          * requests.
1694                          */
1695                         return false;
1696                 }
1697                 break;
1698         case PERSISTENT_RESERVE_IN:
1699                 if (descr->service_action == PRI_READ_FULL_STATUS)
1700                         return false;
1701                 break;
1702         }
1703
1704         return true;
1705 }
1706
1707 static struct target_opcode_descriptor tcm_opcode_pri_read_caps = {
1708         .support = SCSI_SUPPORT_FULL,
1709         .serv_action_valid = 1,
1710         .opcode = PERSISTENT_RESERVE_IN,
1711         .service_action = PRI_REPORT_CAPABILITIES,
1712         .cdb_size = 10,
1713         .usage_bits = {PERSISTENT_RESERVE_IN, PRI_REPORT_CAPABILITIES, 0x00, 0x00,
1714                        0x00, 0x00, 0x00, 0xff,
1715                        0xff, SCSI_CONTROL_MASK},
1716         .enabled = tcm_is_pr_enabled,
1717 };
1718
1719 static struct target_opcode_descriptor tcm_opcode_pri_read_full_status = {
1720         .support = SCSI_SUPPORT_FULL,
1721         .serv_action_valid = 1,
1722         .opcode = PERSISTENT_RESERVE_IN,
1723         .service_action = PRI_READ_FULL_STATUS,
1724         .cdb_size = 10,
1725         .usage_bits = {PERSISTENT_RESERVE_IN, PRI_READ_FULL_STATUS, 0x00, 0x00,
1726                        0x00, 0x00, 0x00, 0xff,
1727                        0xff, SCSI_CONTROL_MASK},
1728         .enabled = tcm_is_pr_enabled,
1729 };
1730
1731 static struct target_opcode_descriptor tcm_opcode_pro_register = {
1732         .support = SCSI_SUPPORT_FULL,
1733         .serv_action_valid = 1,
1734         .opcode = PERSISTENT_RESERVE_OUT,
1735         .service_action = PRO_REGISTER,
1736         .cdb_size = 10,
1737         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_REGISTER, 0xff, 0x00,
1738                        0x00, 0xff, 0xff, 0xff,
1739                        0xff, SCSI_CONTROL_MASK},
1740         .enabled = tcm_is_pr_enabled,
1741 };
1742
1743 static struct target_opcode_descriptor tcm_opcode_pro_reserve = {
1744         .support = SCSI_SUPPORT_FULL,
1745         .serv_action_valid = 1,
1746         .opcode = PERSISTENT_RESERVE_OUT,
1747         .service_action = PRO_RESERVE,
1748         .cdb_size = 10,
1749         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_RESERVE, 0xff, 0x00,
1750                        0x00, 0xff, 0xff, 0xff,
1751                        0xff, SCSI_CONTROL_MASK},
1752         .enabled = tcm_is_pr_enabled,
1753 };
1754
1755 static struct target_opcode_descriptor tcm_opcode_pro_release = {
1756         .support = SCSI_SUPPORT_FULL,
1757         .serv_action_valid = 1,
1758         .opcode = PERSISTENT_RESERVE_OUT,
1759         .service_action = PRO_RELEASE,
1760         .cdb_size = 10,
1761         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_RELEASE, 0xff, 0x00,
1762                        0x00, 0xff, 0xff, 0xff,
1763                        0xff, SCSI_CONTROL_MASK},
1764         .enabled = tcm_is_pr_enabled,
1765 };
1766
1767 static struct target_opcode_descriptor tcm_opcode_pro_clear = {
1768         .support = SCSI_SUPPORT_FULL,
1769         .serv_action_valid = 1,
1770         .opcode = PERSISTENT_RESERVE_OUT,
1771         .service_action = PRO_CLEAR,
1772         .cdb_size = 10,
1773         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_CLEAR, 0xff, 0x00,
1774                        0x00, 0xff, 0xff, 0xff,
1775                        0xff, SCSI_CONTROL_MASK},
1776         .enabled = tcm_is_pr_enabled,
1777 };
1778
1779 static struct target_opcode_descriptor tcm_opcode_pro_preempt = {
1780         .support = SCSI_SUPPORT_FULL,
1781         .serv_action_valid = 1,
1782         .opcode = PERSISTENT_RESERVE_OUT,
1783         .service_action = PRO_PREEMPT,
1784         .cdb_size = 10,
1785         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_PREEMPT, 0xff, 0x00,
1786                        0x00, 0xff, 0xff, 0xff,
1787                        0xff, SCSI_CONTROL_MASK},
1788         .enabled = tcm_is_pr_enabled,
1789 };
1790
1791 static struct target_opcode_descriptor tcm_opcode_pro_preempt_abort = {
1792         .support = SCSI_SUPPORT_FULL,
1793         .serv_action_valid = 1,
1794         .opcode = PERSISTENT_RESERVE_OUT,
1795         .service_action = PRO_PREEMPT_AND_ABORT,
1796         .cdb_size = 10,
1797         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_PREEMPT_AND_ABORT, 0xff, 0x00,
1798                        0x00, 0xff, 0xff, 0xff,
1799                        0xff, SCSI_CONTROL_MASK},
1800         .enabled = tcm_is_pr_enabled,
1801 };
1802
1803 static struct target_opcode_descriptor tcm_opcode_pro_reg_ign_exist = {
1804         .support = SCSI_SUPPORT_FULL,
1805         .serv_action_valid = 1,
1806         .opcode = PERSISTENT_RESERVE_OUT,
1807         .service_action = PRO_REGISTER_AND_IGNORE_EXISTING_KEY,
1808         .cdb_size = 10,
1809         .usage_bits = {
1810                 PERSISTENT_RESERVE_OUT, PRO_REGISTER_AND_IGNORE_EXISTING_KEY,
1811                 0xff, 0x00,
1812                 0x00, 0xff, 0xff, 0xff,
1813                 0xff, SCSI_CONTROL_MASK},
1814         .enabled = tcm_is_pr_enabled,
1815 };
1816
1817 static struct target_opcode_descriptor tcm_opcode_pro_register_move = {
1818         .support = SCSI_SUPPORT_FULL,
1819         .serv_action_valid = 1,
1820         .opcode = PERSISTENT_RESERVE_OUT,
1821         .service_action = PRO_REGISTER_AND_MOVE,
1822         .cdb_size = 10,
1823         .usage_bits = {PERSISTENT_RESERVE_OUT, PRO_REGISTER_AND_MOVE, 0xff, 0x00,
1824                        0x00, 0xff, 0xff, 0xff,
1825                        0xff, SCSI_CONTROL_MASK},
1826         .enabled = tcm_is_pr_enabled,
1827 };
1828
1829 static struct target_opcode_descriptor tcm_opcode_release = {
1830         .support = SCSI_SUPPORT_FULL,
1831         .opcode = RELEASE,
1832         .cdb_size = 6,
1833         .usage_bits = {RELEASE, 0x00, 0x00, 0x00,
1834                        0x00, SCSI_CONTROL_MASK},
1835         .enabled = tcm_is_pr_enabled,
1836 };
1837
1838 static struct target_opcode_descriptor tcm_opcode_release10 = {
1839         .support = SCSI_SUPPORT_FULL,
1840         .opcode = RELEASE_10,
1841         .cdb_size = 10,
1842         .usage_bits = {RELEASE_10, 0x00, 0x00, 0x00,
1843                        0x00, 0x00, 0x00, 0xff,
1844                        0xff, SCSI_CONTROL_MASK},
1845         .enabled = tcm_is_pr_enabled,
1846 };
1847
1848 static struct target_opcode_descriptor tcm_opcode_reserve = {
1849         .support = SCSI_SUPPORT_FULL,
1850         .opcode = RESERVE,
1851         .cdb_size = 6,
1852         .usage_bits = {RESERVE, 0x00, 0x00, 0x00,
1853                        0x00, SCSI_CONTROL_MASK},
1854         .enabled = tcm_is_pr_enabled,
1855 };
1856
1857 static struct target_opcode_descriptor tcm_opcode_reserve10 = {
1858         .support = SCSI_SUPPORT_FULL,
1859         .opcode = RESERVE_10,
1860         .cdb_size = 10,
1861         .usage_bits = {RESERVE_10, 0x00, 0x00, 0x00,
1862                        0x00, 0x00, 0x00, 0xff,
1863                        0xff, SCSI_CONTROL_MASK},
1864         .enabled = tcm_is_pr_enabled,
1865 };
1866
1867 static struct target_opcode_descriptor tcm_opcode_request_sense = {
1868         .support = SCSI_SUPPORT_FULL,
1869         .opcode = REQUEST_SENSE,
1870         .cdb_size = 6,
1871         .usage_bits = {REQUEST_SENSE, 0x00, 0x00, 0x00,
1872                        0xff, SCSI_CONTROL_MASK},
1873 };
1874
1875 static struct target_opcode_descriptor tcm_opcode_inquiry = {
1876         .support = SCSI_SUPPORT_FULL,
1877         .opcode = INQUIRY,
1878         .cdb_size = 6,
1879         .usage_bits = {INQUIRY, 0x01, 0xff, 0xff,
1880                        0xff, SCSI_CONTROL_MASK},
1881 };
1882
1883 static bool tcm_is_3pc_enabled(struct target_opcode_descriptor *descr,
1884                                struct se_cmd *cmd)
1885 {
1886         struct se_device *dev = cmd->se_dev;
1887
1888         return dev->dev_attrib.emulate_3pc;
1889 }
1890
1891 static struct target_opcode_descriptor tcm_opcode_extended_copy_lid1 = {
1892         .support = SCSI_SUPPORT_FULL,
1893         .serv_action_valid = 1,
1894         .opcode = EXTENDED_COPY,
1895         .cdb_size = 16,
1896         .usage_bits = {EXTENDED_COPY, 0x00, 0x00, 0x00,
1897                        0x00, 0x00, 0x00, 0x00,
1898                        0x00, 0x00, 0xff, 0xff,
1899                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1900         .enabled = tcm_is_3pc_enabled,
1901 };
1902
1903 static struct target_opcode_descriptor tcm_opcode_rcv_copy_res_op_params = {
1904         .support = SCSI_SUPPORT_FULL,
1905         .serv_action_valid = 1,
1906         .opcode = RECEIVE_COPY_RESULTS,
1907         .service_action = RCR_SA_OPERATING_PARAMETERS,
1908         .cdb_size = 16,
1909         .usage_bits = {RECEIVE_COPY_RESULTS, RCR_SA_OPERATING_PARAMETERS,
1910                        0x00, 0x00,
1911                        0x00, 0x00, 0x00, 0x00,
1912                        0x00, 0x00, 0xff, 0xff,
1913                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1914         .enabled = tcm_is_3pc_enabled,
1915 };
1916
1917 static struct target_opcode_descriptor tcm_opcode_report_luns = {
1918         .support = SCSI_SUPPORT_FULL,
1919         .opcode = REPORT_LUNS,
1920         .cdb_size = 12,
1921         .usage_bits = {REPORT_LUNS, 0x00, 0xff, 0x00,
1922                        0x00, 0x00, 0xff, 0xff,
1923                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1924 };
1925
1926 static struct target_opcode_descriptor tcm_opcode_test_unit_ready = {
1927         .support = SCSI_SUPPORT_FULL,
1928         .opcode = TEST_UNIT_READY,
1929         .cdb_size = 6,
1930         .usage_bits = {TEST_UNIT_READY, 0x00, 0x00, 0x00,
1931                        0x00, SCSI_CONTROL_MASK},
1932 };
1933
1934 static struct target_opcode_descriptor tcm_opcode_report_target_pgs = {
1935         .support = SCSI_SUPPORT_FULL,
1936         .serv_action_valid = 1,
1937         .opcode = MAINTENANCE_IN,
1938         .service_action = MI_REPORT_TARGET_PGS,
1939         .cdb_size = 12,
1940         .usage_bits = {MAINTENANCE_IN, 0xE0 | MI_REPORT_TARGET_PGS, 0x00, 0x00,
1941                        0x00, 0x00, 0xff, 0xff,
1942                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1943 };
1944
1945 static bool spc_rsoc_enabled(struct target_opcode_descriptor *descr,
1946                              struct se_cmd *cmd)
1947 {
1948         struct se_device *dev = cmd->se_dev;
1949
1950         return dev->dev_attrib.emulate_rsoc;
1951 }
1952
1953 static struct target_opcode_descriptor tcm_opcode_report_supp_opcodes = {
1954         .support = SCSI_SUPPORT_FULL,
1955         .serv_action_valid = 1,
1956         .opcode = MAINTENANCE_IN,
1957         .service_action = MI_REPORT_SUPPORTED_OPERATION_CODES,
1958         .cdb_size = 12,
1959         .usage_bits = {MAINTENANCE_IN, MI_REPORT_SUPPORTED_OPERATION_CODES,
1960                        0x87, 0xff,
1961                        0xff, 0xff, 0xff, 0xff,
1962                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1963         .enabled = spc_rsoc_enabled,
1964 };
1965
1966 static bool tcm_is_set_tpg_enabled(struct target_opcode_descriptor *descr,
1967                                    struct se_cmd *cmd)
1968 {
1969         struct t10_alua_tg_pt_gp *l_tg_pt_gp;
1970         struct se_lun *l_lun = cmd->se_lun;
1971
1972         rcu_read_lock();
1973         l_tg_pt_gp = rcu_dereference(l_lun->lun_tg_pt_gp);
1974         if (!l_tg_pt_gp) {
1975                 rcu_read_unlock();
1976                 return false;
1977         }
1978         if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
1979                 rcu_read_unlock();
1980                 return false;
1981         }
1982         rcu_read_unlock();
1983
1984         return true;
1985 }
1986
1987 static struct target_opcode_descriptor tcm_opcode_set_tpg = {
1988         .support = SCSI_SUPPORT_FULL,
1989         .serv_action_valid = 1,
1990         .opcode = MAINTENANCE_OUT,
1991         .service_action = MO_SET_TARGET_PGS,
1992         .cdb_size = 12,
1993         .usage_bits = {MAINTENANCE_OUT, MO_SET_TARGET_PGS, 0x00, 0x00,
1994                        0x00, 0x00, 0xff, 0xff,
1995                        0xff, 0xff, 0x00, SCSI_CONTROL_MASK},
1996         .enabled = tcm_is_set_tpg_enabled,
1997 };
1998
1999 static struct target_opcode_descriptor *tcm_supported_opcodes[] = {
2000         &tcm_opcode_read6,
2001         &tcm_opcode_read10,
2002         &tcm_opcode_read12,
2003         &tcm_opcode_read16,
2004         &tcm_opcode_write6,
2005         &tcm_opcode_write10,
2006         &tcm_opcode_write_verify10,
2007         &tcm_opcode_write12,
2008         &tcm_opcode_write16,
2009         &tcm_opcode_write_verify16,
2010         &tcm_opcode_write_same32,
2011         &tcm_opcode_compare_write,
2012         &tcm_opcode_read_capacity,
2013         &tcm_opcode_read_capacity16,
2014         &tcm_opcode_read_report_refferals,
2015         &tcm_opcode_sync_cache,
2016         &tcm_opcode_sync_cache16,
2017         &tcm_opcode_unmap,
2018         &tcm_opcode_write_same,
2019         &tcm_opcode_write_same16,
2020         &tcm_opcode_verify,
2021         &tcm_opcode_verify16,
2022         &tcm_opcode_start_stop,
2023         &tcm_opcode_mode_select,
2024         &tcm_opcode_mode_select10,
2025         &tcm_opcode_mode_sense,
2026         &tcm_opcode_mode_sense10,
2027         &tcm_opcode_pri_read_keys,
2028         &tcm_opcode_pri_read_resrv,
2029         &tcm_opcode_pri_read_caps,
2030         &tcm_opcode_pri_read_full_status,
2031         &tcm_opcode_pro_register,
2032         &tcm_opcode_pro_reserve,
2033         &tcm_opcode_pro_release,
2034         &tcm_opcode_pro_clear,
2035         &tcm_opcode_pro_preempt,
2036         &tcm_opcode_pro_preempt_abort,
2037         &tcm_opcode_pro_reg_ign_exist,
2038         &tcm_opcode_pro_register_move,
2039         &tcm_opcode_release,
2040         &tcm_opcode_release10,
2041         &tcm_opcode_reserve,
2042         &tcm_opcode_reserve10,
2043         &tcm_opcode_request_sense,
2044         &tcm_opcode_inquiry,
2045         &tcm_opcode_extended_copy_lid1,
2046         &tcm_opcode_rcv_copy_res_op_params,
2047         &tcm_opcode_report_luns,
2048         &tcm_opcode_test_unit_ready,
2049         &tcm_opcode_report_target_pgs,
2050         &tcm_opcode_report_supp_opcodes,
2051         &tcm_opcode_set_tpg,
2052 };
2053
2054 static int
2055 spc_rsoc_encode_command_timeouts_descriptor(unsigned char *buf, u8 ctdp,
2056                                 struct target_opcode_descriptor *descr)
2057 {
2058         if (!ctdp)
2059                 return 0;
2060
2061         put_unaligned_be16(0xa, buf);
2062         buf[3] = descr->specific_timeout;
2063         put_unaligned_be32(descr->nominal_timeout, &buf[4]);
2064         put_unaligned_be32(descr->recommended_timeout, &buf[8]);
2065
2066         return 12;
2067 }
2068
2069 static int
2070 spc_rsoc_encode_command_descriptor(unsigned char *buf, u8 ctdp,
2071                                    struct target_opcode_descriptor *descr)
2072 {
2073         int td_size = 0;
2074
2075         buf[0] = descr->opcode;
2076
2077         put_unaligned_be16(descr->service_action, &buf[2]);
2078
2079         buf[5] = (ctdp << 1) | descr->serv_action_valid;
2080         put_unaligned_be16(descr->cdb_size, &buf[6]);
2081
2082         td_size = spc_rsoc_encode_command_timeouts_descriptor(&buf[8], ctdp,
2083                                                               descr);
2084
2085         return 8 + td_size;
2086 }
2087
2088 static int
2089 spc_rsoc_encode_one_command_descriptor(unsigned char *buf, u8 ctdp,
2090                                        struct target_opcode_descriptor *descr,
2091                                        struct se_device *dev)
2092 {
2093         int td_size = 0;
2094
2095         if (!descr) {
2096                 buf[1] = (ctdp << 7) | SCSI_SUPPORT_NOT_SUPPORTED;
2097                 return 2;
2098         }
2099
2100         buf[1] = (ctdp << 7) | SCSI_SUPPORT_FULL;
2101         put_unaligned_be16(descr->cdb_size, &buf[2]);
2102         memcpy(&buf[4], descr->usage_bits, descr->cdb_size);
2103         if (descr->update_usage_bits)
2104                 descr->update_usage_bits(&buf[4], dev);
2105
2106         td_size = spc_rsoc_encode_command_timeouts_descriptor(
2107                         &buf[4 + descr->cdb_size], ctdp, descr);
2108
2109         return 4 + descr->cdb_size + td_size;
2110 }
2111
2112 static sense_reason_t
2113 spc_rsoc_get_descr(struct se_cmd *cmd, struct target_opcode_descriptor **opcode)
2114 {
2115         struct target_opcode_descriptor *descr;
2116         struct se_session *sess = cmd->se_sess;
2117         unsigned char *cdb = cmd->t_task_cdb;
2118         u8 opts = cdb[2] & 0x3;
2119         u8 requested_opcode;
2120         u16 requested_sa;
2121         int i;
2122
2123         requested_opcode = cdb[3];
2124         requested_sa = ((u16)cdb[4]) << 8 | cdb[5];
2125         *opcode = NULL;
2126
2127         if (opts > 3) {
2128                 pr_debug("TARGET_CORE[%s]: Invalid REPORT SUPPORTED OPERATION CODES"
2129                         " with unsupported REPORTING OPTIONS %#x for 0x%08llx from %s\n",
2130                         cmd->se_tfo->fabric_name, opts,
2131                         cmd->se_lun->unpacked_lun,
2132                         sess->se_node_acl->initiatorname);
2133                 return TCM_INVALID_CDB_FIELD;
2134         }
2135
2136         for (i = 0; i < ARRAY_SIZE(tcm_supported_opcodes); i++) {
2137                 descr = tcm_supported_opcodes[i];
2138                 if (descr->opcode != requested_opcode)
2139                         continue;
2140
2141                 switch (opts) {
2142                 case 0x1:
2143                         /*
2144                          * If the REQUESTED OPERATION CODE field specifies an
2145                          * operation code for which the device server implements
2146                          * service actions, then the device server shall
2147                          * terminate the command with CHECK CONDITION status,
2148                          * with the sense key set to ILLEGAL REQUEST, and the
2149                          * additional sense code set to INVALID FIELD IN CDB
2150                          */
2151                         if (descr->serv_action_valid)
2152                                 return TCM_INVALID_CDB_FIELD;
2153
2154                         if (!descr->enabled || descr->enabled(descr, cmd))
2155                                 *opcode = descr;
2156                         break;
2157                 case 0x2:
2158                         /*
2159                          * If the REQUESTED OPERATION CODE field specifies an
2160                          * operation code for which the device server does not
2161                          * implement service actions, then the device server
2162                          * shall terminate the command with CHECK CONDITION
2163                          * status, with the sense key set to ILLEGAL REQUEST,
2164                          * and the additional sense code set to INVALID FIELD IN CDB.
2165                          */
2166                         if (descr->serv_action_valid &&
2167                             descr->service_action == requested_sa) {
2168                                 if (!descr->enabled || descr->enabled(descr,
2169                                                                       cmd))
2170                                         *opcode = descr;
2171                         } else if (!descr->serv_action_valid)
2172                                 return TCM_INVALID_CDB_FIELD;
2173                         break;
2174                 case 0x3:
2175                         /*
2176                          * The command support data for the operation code and
2177                          * service action a specified in the REQUESTED OPERATION
2178                          * CODE field and REQUESTED SERVICE ACTION field shall
2179                          * be returned in the one_command parameter data format.
2180                          */
2181                         if (descr->service_action == requested_sa)
2182                                 if (!descr->enabled || descr->enabled(descr,
2183                                                                       cmd))
2184                                         *opcode = descr;
2185                         break;
2186                 }
2187         }
2188
2189         return 0;
2190 }
2191
2192 static sense_reason_t
2193 spc_emulate_report_supp_op_codes(struct se_cmd *cmd)
2194 {
2195         int descr_num = ARRAY_SIZE(tcm_supported_opcodes);
2196         struct target_opcode_descriptor *descr = NULL;
2197         unsigned char *cdb = cmd->t_task_cdb;
2198         u8 rctd = (cdb[2] >> 7) & 0x1;
2199         unsigned char *buf = NULL;
2200         int response_length = 0;
2201         u8 opts = cdb[2] & 0x3;
2202         unsigned char *rbuf;
2203         sense_reason_t ret = 0;
2204         int i;
2205
2206         if (!cmd->se_dev->dev_attrib.emulate_rsoc)
2207                 return TCM_UNSUPPORTED_SCSI_OPCODE;
2208
2209         rbuf = transport_kmap_data_sg(cmd);
2210         if (cmd->data_length && !rbuf) {
2211                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2212                 goto out;
2213         }
2214
2215         if (opts == 0)
2216                 response_length = 4 + (8 + rctd * 12) * descr_num;
2217         else {
2218                 ret = spc_rsoc_get_descr(cmd, &descr);
2219                 if (ret)
2220                         goto out;
2221
2222                 if (descr)
2223                         response_length = 4 + descr->cdb_size + rctd * 12;
2224                 else
2225                         response_length = 2;
2226         }
2227
2228         buf = kzalloc(response_length, GFP_KERNEL);
2229         if (!buf) {
2230                 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2231                 goto out;
2232         }
2233         response_length = 0;
2234
2235         if (opts == 0) {
2236                 response_length += 4;
2237
2238                 for (i = 0; i < ARRAY_SIZE(tcm_supported_opcodes); i++) {
2239                         descr = tcm_supported_opcodes[i];
2240                         if (descr->enabled && !descr->enabled(descr, cmd))
2241                                 continue;
2242
2243                         response_length += spc_rsoc_encode_command_descriptor(
2244                                         &buf[response_length], rctd, descr);
2245                 }
2246                 put_unaligned_be32(response_length - 3, buf);
2247         } else {
2248                 response_length = spc_rsoc_encode_one_command_descriptor(
2249                                 &buf[response_length], rctd, descr,
2250                                 cmd->se_dev);
2251         }
2252
2253         memcpy(rbuf, buf, min_t(u32, response_length, cmd->data_length));
2254 out:
2255         kfree(buf);
2256         transport_kunmap_data_sg(cmd);
2257
2258         if (!ret)
2259                 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, response_length);
2260         return ret;
2261 }
2262
2263 sense_reason_t
2264 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
2265 {
2266         struct se_device *dev = cmd->se_dev;
2267         unsigned char *cdb = cmd->t_task_cdb;
2268
2269         switch (cdb[0]) {
2270         case RESERVE:
2271         case RESERVE_10:
2272         case RELEASE:
2273         case RELEASE_10:
2274                 if (!dev->dev_attrib.emulate_pr)
2275                         return TCM_UNSUPPORTED_SCSI_OPCODE;
2276
2277                 if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
2278                         return TCM_UNSUPPORTED_SCSI_OPCODE;
2279                 break;
2280         case PERSISTENT_RESERVE_IN:
2281         case PERSISTENT_RESERVE_OUT:
2282                 if (!dev->dev_attrib.emulate_pr)
2283                         return TCM_UNSUPPORTED_SCSI_OPCODE;
2284                 break;
2285         }
2286
2287         switch (cdb[0]) {
2288         case MODE_SELECT:
2289                 *size = cdb[4];
2290                 cmd->execute_cmd = spc_emulate_modeselect;
2291                 break;
2292         case MODE_SELECT_10:
2293                 *size = get_unaligned_be16(&cdb[7]);
2294                 cmd->execute_cmd = spc_emulate_modeselect;
2295                 break;
2296         case MODE_SENSE:
2297                 *size = cdb[4];
2298                 cmd->execute_cmd = spc_emulate_modesense;
2299                 break;
2300         case MODE_SENSE_10:
2301                 *size = get_unaligned_be16(&cdb[7]);
2302                 cmd->execute_cmd = spc_emulate_modesense;
2303                 break;
2304         case LOG_SELECT:
2305         case LOG_SENSE:
2306                 *size = get_unaligned_be16(&cdb[7]);
2307                 break;
2308         case PERSISTENT_RESERVE_IN:
2309                 *size = get_unaligned_be16(&cdb[7]);
2310                 cmd->execute_cmd = target_scsi3_emulate_pr_in;
2311                 break;
2312         case PERSISTENT_RESERVE_OUT:
2313                 *size = get_unaligned_be32(&cdb[5]);
2314                 cmd->execute_cmd = target_scsi3_emulate_pr_out;
2315                 break;
2316         case RELEASE:
2317         case RELEASE_10:
2318                 if (cdb[0] == RELEASE_10)
2319                         *size = get_unaligned_be16(&cdb[7]);
2320                 else
2321                         *size = cmd->data_length;
2322
2323                 cmd->execute_cmd = target_scsi2_reservation_release;
2324                 break;
2325         case RESERVE:
2326         case RESERVE_10:
2327                 /*
2328                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2329                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2330                  */
2331                 if (cdb[0] == RESERVE_10)
2332                         *size = get_unaligned_be16(&cdb[7]);
2333                 else
2334                         *size = cmd->data_length;
2335
2336                 cmd->execute_cmd = target_scsi2_reservation_reserve;
2337                 break;
2338         case REQUEST_SENSE:
2339                 *size = cdb[4];
2340                 cmd->execute_cmd = spc_emulate_request_sense;
2341                 break;
2342         case INQUIRY:
2343                 *size = get_unaligned_be16(&cdb[3]);
2344
2345                 /*
2346                  * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
2347                  * See spc4r17 section 5.3
2348                  */
2349                 cmd->sam_task_attr = TCM_HEAD_TAG;
2350                 cmd->execute_cmd = spc_emulate_inquiry;
2351                 break;
2352         case SECURITY_PROTOCOL_IN:
2353         case SECURITY_PROTOCOL_OUT:
2354                 *size = get_unaligned_be32(&cdb[6]);
2355                 break;
2356         case EXTENDED_COPY:
2357                 *size = get_unaligned_be32(&cdb[10]);
2358                 cmd->execute_cmd = target_do_xcopy;
2359                 break;
2360         case RECEIVE_COPY_RESULTS:
2361                 *size = get_unaligned_be32(&cdb[10]);
2362                 cmd->execute_cmd = target_do_receive_copy_results;
2363                 break;
2364         case READ_ATTRIBUTE:
2365         case WRITE_ATTRIBUTE:
2366                 *size = get_unaligned_be32(&cdb[10]);
2367                 break;
2368         case RECEIVE_DIAGNOSTIC:
2369         case SEND_DIAGNOSTIC:
2370                 *size = get_unaligned_be16(&cdb[3]);
2371                 break;
2372         case WRITE_BUFFER:
2373                 *size = get_unaligned_be24(&cdb[6]);
2374                 break;
2375         case REPORT_LUNS:
2376                 cmd->execute_cmd = spc_emulate_report_luns;
2377                 *size = get_unaligned_be32(&cdb[6]);
2378                 /*
2379                  * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
2380                  * See spc4r17 section 5.3
2381                  */
2382                 cmd->sam_task_attr = TCM_HEAD_TAG;
2383                 break;
2384         case TEST_UNIT_READY:
2385                 cmd->execute_cmd = spc_emulate_testunitready;
2386                 *size = 0;
2387                 break;
2388         case MAINTENANCE_IN:
2389                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2390                         /*
2391                          * MAINTENANCE_IN from SCC-2
2392                          * Check for emulated MI_REPORT_TARGET_PGS
2393                          */
2394                         if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
2395                                 cmd->execute_cmd =
2396                                         target_emulate_report_target_port_groups;
2397                         }
2398                         if ((cdb[1] & 0x1f) ==
2399                             MI_REPORT_SUPPORTED_OPERATION_CODES)
2400                                 cmd->execute_cmd =
2401                                         spc_emulate_report_supp_op_codes;
2402                         *size = get_unaligned_be32(&cdb[6]);
2403                 } else {
2404                         /*
2405                          * GPCMD_SEND_KEY from multi media commands
2406                          */
2407                         *size = get_unaligned_be16(&cdb[8]);
2408                 }
2409                 break;
2410         case MAINTENANCE_OUT:
2411                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2412                         /*
2413                          * MAINTENANCE_OUT from SCC-2
2414                          * Check for emulated MO_SET_TARGET_PGS.
2415                          */
2416                         if (cdb[1] == MO_SET_TARGET_PGS) {
2417                                 cmd->execute_cmd =
2418                                         target_emulate_set_target_port_groups;
2419                         }
2420                         *size = get_unaligned_be32(&cdb[6]);
2421                 } else {
2422                         /*
2423                          * GPCMD_SEND_KEY from multi media commands
2424                          */
2425                         *size = get_unaligned_be16(&cdb[8]);
2426                 }
2427                 break;
2428         default:
2429                 return TCM_UNSUPPORTED_SCSI_OPCODE;
2430         }
2431
2432         return 0;
2433 }
2434 EXPORT_SYMBOL(spc_parse_cdb);