drivers/target/target_core

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
spc_fill_alua_data
spc_emulate_inquiry_std
spc_emulate_evpd_80
spc_parse_naa_6h_vendor_specific
spc_emulate_evpd_83
spc_emulate_evpd_86
spc_emulate_evpd_b0
spc_emulate_evpd_b1
spc_emulate_evpd_b2
spc_emulate_evpd_b3
spc_emulate_evpd_00
spc_emulate_inquiry
spc_modesense_rwrecovery
spc_modesense_control
spc_modesense_caching
spc_modesense_informational_exceptions
spc_modesense_write_protect
spc_modesense_dpofua
spc_modesense_blockdesc
spc_modesense_long_blockdesc
spc_emulate_modesense
spc_emulate_modeselect
spc_emulate_request_sense
spc_emulate_report_luns
spc_emulate_testunitready
spc_parse_cdb
   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         spin_lock(&lun->lun_tg_pt_gp_lock);
  44         tg_pt_gp = lun->lun_tg_pt_gp;
  45         if (tg_pt_gp)
  46                 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type;
  47         spin_unlock(&lun->lun_tg_pt_gp_lock);
  48 }
  49 
  50 sense_reason_t
  51 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
  52 {
  53         struct se_lun *lun = cmd->se_lun;
  54         struct se_device *dev = cmd->se_dev;
  55         struct se_session *sess = cmd->se_sess;
  56 
  57         /* Set RMB (removable media) for tape devices */
  58         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
  59                 buf[1] = 0x80;
  60 
  61         buf[2] = 0x05; /* SPC-3 */
  62 
  63         /*
  64          * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2
  65          *
  66          * SPC4 says:
  67          *   A RESPONSE DATA FORMAT field set to 2h indicates that the
  68          *   standard INQUIRY data is in the format defined in this
  69          *   standard. Response data format values less than 2h are
  70          *   obsolete. Response data format values greater than 2h are
  71          *   reserved.
  72          */
  73         buf[3] = 2;
  74 
  75         /*
  76          * Enable SCCS and TPGS fields for Emulated ALUA
  77          */
  78         spc_fill_alua_data(lun, buf);
  79 
  80         /*
  81          * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY
  82          */
  83         if (dev->dev_attrib.emulate_3pc)
  84                 buf[5] |= 0x8;
  85         /*
  86          * Set Protection (PROTECT) bit when DIF has been enabled on the
  87          * device, and the fabric supports VERIFY + PASS.  Also report
  88          * PROTECT=1 if sess_prot_type has been configured to allow T10-PI
  89          * to unprotected devices.
  90          */
  91         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
  92                 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)
  93                         buf[5] |= 0x1;
  94         }
  95 
  96         buf[7] = 0x2; /* CmdQue=1 */
  97 
  98         /*
  99          * ASCII data fields described as being left-aligned shall have any
 100          * unused bytes at the end of the field (i.e., highest offset) and the
 101          * unused bytes shall be filled with ASCII space characters (20h).
 102          */
 103         memset(&buf[8], 0x20,
 104                INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN);
 105         memcpy(&buf[8], dev->t10_wwn.vendor,
 106                strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 107         memcpy(&buf[16], dev->t10_wwn.model,
 108                strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN));
 109         memcpy(&buf[32], dev->t10_wwn.revision,
 110                strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN));
 111         buf[4] = 31; /* Set additional length to 31 */
 112 
 113         return 0;
 114 }
 115 EXPORT_SYMBOL(spc_emulate_inquiry_std);
 116 
 117 /* unit serial number */
 118 static sense_reason_t
 119 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 120 {
 121         struct se_device *dev = cmd->se_dev;
 122         u16 len;
 123 
 124         if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 125                 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial);
 126                 len++; /* Extra Byte for NULL Terminator */
 127                 buf[3] = len;
 128         }
 129         return 0;
 130 }
 131 
 132 void spc_parse_naa_6h_vendor_specific(struct se_device *dev,
 133                                       unsigned char *buf)
 134 {
 135         unsigned char *p = &dev->t10_wwn.unit_serial[0];
 136         int cnt;
 137         bool next = true;
 138 
 139         /*
 140          * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
 141          * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
 142          * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION
 143          * to complete the payload.  These are based from VPD=0x80 PRODUCT SERIAL
 144          * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
 145          * per device uniqeness.
 146          */
 147         for (cnt = 0; *p && cnt < 13; p++) {
 148                 int val = hex_to_bin(*p);
 149 
 150                 if (val < 0)
 151                         continue;
 152 
 153                 if (next) {
 154                         next = false;
 155                         buf[cnt++] |= val;
 156                 } else {
 157                         next = true;
 158                         buf[cnt] = val << 4;
 159                 }
 160         }
 161 }
 162 
 163 /*
 164  * Device identification VPD, for a complete list of
 165  * DESIGNATOR TYPEs see spc4r17 Table 459.
 166  */
 167 sense_reason_t
 168 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
 169 {
 170         struct se_device *dev = cmd->se_dev;
 171         struct se_lun *lun = cmd->se_lun;
 172         struct se_portal_group *tpg = NULL;
 173         struct t10_alua_lu_gp_member *lu_gp_mem;
 174         struct t10_alua_tg_pt_gp *tg_pt_gp;
 175         unsigned char *prod = &dev->t10_wwn.model[0];
 176         u32 prod_len;
 177         u32 unit_serial_len, off = 0;
 178         u16 len = 0, id_len;
 179 
 180         off = 4;
 181 
 182         /*
 183          * NAA IEEE Registered Extended Assigned designator format, see
 184          * spc4r17 section 7.7.3.6.5
 185          *
 186          * We depend upon a target_core_mod/ConfigFS provided
 187          * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial
 188          * value in order to return the NAA id.
 189          */
 190         if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
 191                 goto check_t10_vend_desc;
 192 
 193         /* CODE SET == Binary */
 194         buf[off++] = 0x1;
 195 
 196         /* Set ASSOCIATION == addressed logical unit: 0)b */
 197         buf[off] = 0x00;
 198 
 199         /* Identifier/Designator type == NAA identifier */
 200         buf[off++] |= 0x3;
 201         off++;
 202 
 203         /* Identifier/Designator length */
 204         buf[off++] = 0x10;
 205 
 206         /*
 207          * Start NAA IEEE Registered Extended Identifier/Designator
 208          */
 209         buf[off++] = (0x6 << 4);
 210 
 211         /*
 212          * Use OpenFabrics IEEE Company ID: 00 14 05
 213          */
 214         buf[off++] = 0x01;
 215         buf[off++] = 0x40;
 216         buf[off] = (0x5 << 4);
 217 
 218         /*
 219          * Return ConfigFS Unit Serial Number information for
 220          * VENDOR_SPECIFIC_IDENTIFIER and
 221          * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
 222          */
 223         spc_parse_naa_6h_vendor_specific(dev, &buf[off]);
 224 
 225         len = 20;
 226         off = (len + 4);
 227 
 228 check_t10_vend_desc:
 229         /*
 230          * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
 231          */
 232         id_len = 8; /* For Vendor field */
 233         prod_len = 4; /* For VPD Header */
 234         prod_len += 8; /* For Vendor field */
 235         prod_len += strlen(prod);
 236         prod_len++; /* For : */
 237 
 238         if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 239                 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]);
 240                 unit_serial_len++; /* For NULL Terminator */
 241 
 242                 id_len += sprintf(&buf[off+12], "%s:%s", prod,
 243                                 &dev->t10_wwn.unit_serial[0]);
 244         }
 245         buf[off] = 0x2; /* ASCII */
 246         buf[off+1] = 0x1; /* T10 Vendor ID */
 247         buf[off+2] = 0x0;
 248         /* left align Vendor ID and pad with spaces */
 249         memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
 250         memcpy(&buf[off+4], dev->t10_wwn.vendor,
 251                strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
 252         /* Extra Byte for NULL Terminator */
 253         id_len++;
 254         /* Identifier Length */
 255         buf[off+3] = id_len;
 256         /* Header size for Designation descriptor */
 257         len += (id_len + 4);
 258         off += (id_len + 4);
 259 
 260         if (1) {
 261                 struct t10_alua_lu_gp *lu_gp;
 262                 u32 padding, scsi_name_len, scsi_target_len;
 263                 u16 lu_gp_id = 0;
 264                 u16 tg_pt_gp_id = 0;
 265                 u16 tpgt;
 266 
 267                 tpg = lun->lun_tpg;
 268                 /*
 269                  * Relative target port identifer, see spc4r17
 270                  * section 7.7.3.7
 271                  *
 272                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 273                  * section 7.5.1 Table 362
 274                  */
 275                 buf[off] = tpg->proto_id << 4;
 276                 buf[off++] |= 0x1; /* CODE SET == Binary */
 277                 buf[off] = 0x80; /* Set PIV=1 */
 278                 /* Set ASSOCIATION == target port: 01b */
 279                 buf[off] |= 0x10;
 280                 /* DESIGNATOR TYPE == Relative target port identifer */
 281                 buf[off++] |= 0x4;
 282                 off++; /* Skip over Reserved */
 283                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 284                 /* Skip over Obsolete field in RTPI payload
 285                  * in Table 472 */
 286                 off += 2;
 287                 put_unaligned_be16(lun->lun_rtpi, &buf[off]);
 288                 off += 2;
 289                 len += 8; /* Header size + Designation descriptor */
 290                 /*
 291                  * Target port group identifier, see spc4r17
 292                  * section 7.7.3.8
 293                  *
 294                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 295                  * section 7.5.1 Table 362
 296                  */
 297                 spin_lock(&lun->lun_tg_pt_gp_lock);
 298                 tg_pt_gp = lun->lun_tg_pt_gp;
 299                 if (!tg_pt_gp) {
 300                         spin_unlock(&lun->lun_tg_pt_gp_lock);
 301                         goto check_lu_gp;
 302                 }
 303                 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id;
 304                 spin_unlock(&lun->lun_tg_pt_gp_lock);
 305 
 306                 buf[off] = tpg->proto_id << 4;
 307                 buf[off++] |= 0x1; /* CODE SET == Binary */
 308                 buf[off] = 0x80; /* Set PIV=1 */
 309                 /* Set ASSOCIATION == target port: 01b */
 310                 buf[off] |= 0x10;
 311                 /* DESIGNATOR TYPE == Target port group identifier */
 312                 buf[off++] |= 0x5;
 313                 off++; /* Skip over Reserved */
 314                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 315                 off += 2; /* Skip over Reserved Field */
 316                 put_unaligned_be16(tg_pt_gp_id, &buf[off]);
 317                 off += 2;
 318                 len += 8; /* Header size + Designation descriptor */
 319                 /*
 320                  * Logical Unit Group identifier, see spc4r17
 321                  * section 7.7.3.8
 322                  */
 323 check_lu_gp:
 324                 lu_gp_mem = dev->dev_alua_lu_gp_mem;
 325                 if (!lu_gp_mem)
 326                         goto check_scsi_name;
 327 
 328                 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
 329                 lu_gp = lu_gp_mem->lu_gp;
 330                 if (!lu_gp) {
 331                         spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 332                         goto check_scsi_name;
 333                 }
 334                 lu_gp_id = lu_gp->lu_gp_id;
 335                 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
 336 
 337                 buf[off++] |= 0x1; /* CODE SET == Binary */
 338                 /* DESIGNATOR TYPE == Logical Unit Group identifier */
 339                 buf[off++] |= 0x6;
 340                 off++; /* Skip over Reserved */
 341                 buf[off++] = 4; /* DESIGNATOR LENGTH */
 342                 off += 2; /* Skip over Reserved Field */
 343                 put_unaligned_be16(lu_gp_id, &buf[off]);
 344                 off += 2;
 345                 len += 8; /* Header size + Designation descriptor */
 346                 /*
 347                  * SCSI name string designator, see spc4r17
 348                  * section 7.7.3.11
 349                  *
 350                  * Get the PROTOCOL IDENTIFIER as defined by spc4r17
 351                  * section 7.5.1 Table 362
 352                  */
 353 check_scsi_name:
 354                 buf[off] = tpg->proto_id << 4;
 355                 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 356                 buf[off] = 0x80; /* Set PIV=1 */
 357                 /* Set ASSOCIATION == target port: 01b */
 358                 buf[off] |= 0x10;
 359                 /* DESIGNATOR TYPE == SCSI name string */
 360                 buf[off++] |= 0x8;
 361                 off += 2; /* Skip over Reserved and length */
 362                 /*
 363                  * SCSI name string identifer containing, $FABRIC_MOD
 364                  * dependent information.  For LIO-Target and iSCSI
 365                  * Target Port, this means "<iSCSI name>,t,0x<TPGT> in
 366                  * UTF-8 encoding.
 367                  */
 368                 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
 369                 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x",
 370                                         tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt);
 371                 scsi_name_len += 1 /* Include  NULL terminator */;
 372                 /*
 373                  * The null-terminated, null-padded (see 4.4.2) SCSI
 374                  * NAME STRING field contains a UTF-8 format string.
 375                  * The number of bytes in the SCSI NAME STRING field
 376                  * (i.e., the value in the DESIGNATOR LENGTH field)
 377                  * shall be no larger than 256 and shall be a multiple
 378                  * of four.
 379                  */
 380                 padding = ((-scsi_name_len) & 3);
 381                 if (padding)
 382                         scsi_name_len += padding;
 383                 if (scsi_name_len > 256)
 384                         scsi_name_len = 256;
 385 
 386                 buf[off-1] = scsi_name_len;
 387                 off += scsi_name_len;
 388                 /* Header size + Designation descriptor */
 389                 len += (scsi_name_len + 4);
 390 
 391                 /*
 392                  * Target device designator
 393                  */
 394                 buf[off] = tpg->proto_id << 4;
 395                 buf[off++] |= 0x3; /* CODE SET == UTF-8 */
 396                 buf[off] = 0x80; /* Set PIV=1 */
 397                 /* Set ASSOCIATION == target device: 10b */
 398                 buf[off] |= 0x20;
 399                 /* DESIGNATOR TYPE == SCSI name string */
 400                 buf[off++] |= 0x8;
 401                 off += 2; /* Skip over Reserved and length */
 402                 /*
 403                  * SCSI name string identifer containing, $FABRIC_MOD
 404                  * dependent information.  For LIO-Target and iSCSI
 405                  * Target Port, this means "<iSCSI name>" in
 406                  * UTF-8 encoding.
 407                  */
 408                 scsi_target_len = sprintf(&buf[off], "%s",
 409                                           tpg->se_tpg_tfo->tpg_get_wwn(tpg));
 410                 scsi_target_len += 1 /* Include  NULL terminator */;
 411                 /*
 412                  * The null-terminated, null-padded (see 4.4.2) SCSI
 413                  * NAME STRING field contains a UTF-8 format string.
 414                  * The number of bytes in the SCSI NAME STRING field
 415                  * (i.e., the value in the DESIGNATOR LENGTH field)
 416                  * shall be no larger than 256 and shall be a multiple
 417                  * of four.
 418                  */
 419                 padding = ((-scsi_target_len) & 3);
 420                 if (padding)
 421                         scsi_target_len += padding;
 422                 if (scsi_target_len > 256)
 423                         scsi_target_len = 256;
 424 
 425                 buf[off-1] = scsi_target_len;
 426                 off += scsi_target_len;
 427 
 428                 /* Header size + Designation descriptor */
 429                 len += (scsi_target_len + 4);
 430         }
 431         put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
 432         return 0;
 433 }
 434 EXPORT_SYMBOL(spc_emulate_evpd_83);
 435 
 436 /* Extended INQUIRY Data VPD Page */
 437 static sense_reason_t
 438 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 439 {
 440         struct se_device *dev = cmd->se_dev;
 441         struct se_session *sess = cmd->se_sess;
 442 
 443         buf[3] = 0x3c;
 444         /*
 445          * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
 446          * only for TYPE3 protection.
 447          */
 448         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 449                 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT ||
 450                     cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT)
 451                         buf[4] = 0x5;
 452                 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT ||
 453                          cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT)
 454                         buf[4] = 0x4;
 455         }
 456 
 457         /* logical unit supports type 1 and type 3 protection */
 458         if ((dev->transport->get_device_type(dev) == TYPE_DISK) &&
 459             (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) &&
 460             (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) {
 461                 buf[4] |= (0x3 << 3);
 462         }
 463 
 464         /* Set HEADSUP, ORDSUP, SIMPSUP */
 465         buf[5] = 0x07;
 466 
 467         /* If WriteCache emulation is enabled, set V_SUP */
 468         if (target_check_wce(dev))
 469                 buf[6] = 0x01;
 470         /* If an LBA map is present set R_SUP */
 471         spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
 472         if (!list_empty(&dev->t10_alua.lba_map_list))
 473                 buf[8] = 0x10;
 474         spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
 475         return 0;
 476 }
 477 
 478 /* Block Limits VPD page */
 479 static sense_reason_t
 480 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf)
 481 {
 482         struct se_device *dev = cmd->se_dev;
 483         u32 mtl = 0;
 484         int have_tp = 0, opt, min;
 485 
 486         /*
 487          * Following spc3r22 section 6.5.3 Block Limits VPD page, when
 488          * emulate_tpu=1 or emulate_tpws=1 we will be expect a
 489          * different page length for Thin Provisioning.
 490          */
 491         if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 492                 have_tp = 1;
 493 
 494         buf[0] = dev->transport->get_device_type(dev);
 495         buf[3] = have_tp ? 0x3c : 0x10;
 496 
 497         /* Set WSNZ to 1 */
 498         buf[4] = 0x01;
 499         /*
 500          * Set MAXIMUM COMPARE AND WRITE LENGTH
 501          */
 502         if (dev->dev_attrib.emulate_caw)
 503                 buf[5] = 0x01;
 504 
 505         /*
 506          * Set OPTIMAL TRANSFER LENGTH GRANULARITY
 507          */
 508         if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev)))
 509                 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]);
 510         else
 511                 put_unaligned_be16(1, &buf[6]);
 512 
 513         /*
 514          * Set MAXIMUM TRANSFER LENGTH
 515          *
 516          * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics
 517          * enforcing maximum HW scatter-gather-list entry limit
 518          */
 519         if (cmd->se_tfo->max_data_sg_nents) {
 520                 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) /
 521                        dev->dev_attrib.block_size;
 522         }
 523         put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]);
 524 
 525         /*
 526          * Set OPTIMAL TRANSFER LENGTH
 527          */
 528         if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev)))
 529                 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]);
 530         else
 531                 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]);
 532 
 533         /*
 534          * Exit now if we don't support TP.
 535          */
 536         if (!have_tp)
 537                 goto max_write_same;
 538 
 539         /*
 540          * Set MAXIMUM UNMAP LBA COUNT
 541          */
 542         put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]);
 543 
 544         /*
 545          * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT
 546          */
 547         put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count,
 548                            &buf[24]);
 549 
 550         /*
 551          * Set OPTIMAL UNMAP GRANULARITY
 552          */
 553         put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]);
 554 
 555         /*
 556          * UNMAP GRANULARITY ALIGNMENT
 557          */
 558         put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment,
 559                            &buf[32]);
 560         if (dev->dev_attrib.unmap_granularity_alignment != 0)
 561                 buf[32] |= 0x80; /* Set the UGAVALID bit */
 562 
 563         /*
 564          * MAXIMUM WRITE SAME LENGTH
 565          */
 566 max_write_same:
 567         put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]);
 568 
 569         return 0;
 570 }
 571 
 572 /* Block Device Characteristics VPD page */
 573 static sense_reason_t
 574 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf)
 575 {
 576         struct se_device *dev = cmd->se_dev;
 577 
 578         buf[0] = dev->transport->get_device_type(dev);
 579         buf[3] = 0x3c;
 580         buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0;
 581 
 582         return 0;
 583 }
 584 
 585 /* Thin Provisioning VPD */
 586 static sense_reason_t
 587 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
 588 {
 589         struct se_device *dev = cmd->se_dev;
 590 
 591         /*
 592          * From spc3r22 section 6.5.4 Thin Provisioning VPD page:
 593          *
 594          * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to
 595          * zero, then the page length shall be set to 0004h.  If the DP bit
 596          * is set to one, then the page length shall be set to the value
 597          * defined in table 162.
 598          */
 599         buf[0] = dev->transport->get_device_type(dev);
 600 
 601         /*
 602          * Set Hardcoded length mentioned above for DP=0
 603          */
 604         put_unaligned_be16(0x0004, &buf[2]);
 605 
 606         /*
 607          * The THRESHOLD EXPONENT field indicates the threshold set size in
 608          * LBAs as a power of 2 (i.e., the threshold set size is equal to
 609          * 2(threshold exponent)).
 610          *
 611          * Note that this is currently set to 0x00 as mkp says it will be
 612          * changing again.  We can enable this once it has settled in T10
 613          * and is actually used by Linux/SCSI ML code.
 614          */
 615         buf[4] = 0x00;
 616 
 617         /*
 618          * A TPU bit set to one indicates that the device server supports
 619          * the UNMAP command (see 5.25). A TPU bit set to zero indicates
 620          * that the device server does not support the UNMAP command.
 621          */
 622         if (dev->dev_attrib.emulate_tpu != 0)
 623                 buf[5] = 0x80;
 624 
 625         /*
 626          * A TPWS bit set to one indicates that the device server supports
 627          * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs.
 628          * A TPWS bit set to zero indicates that the device server does not
 629          * support the use of the WRITE SAME (16) command to unmap LBAs.
 630          */
 631         if (dev->dev_attrib.emulate_tpws != 0)
 632                 buf[5] |= 0x40 | 0x20;
 633 
 634         /*
 635          * The unmap_zeroes_data set means that the underlying device supports
 636          * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This
 637          * satisfies the SBC requirements for LBPRZ, meaning that a subsequent
 638          * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA
 639          * See sbc4r36 6.6.4.
 640          */
 641         if (((dev->dev_attrib.emulate_tpu != 0) ||
 642              (dev->dev_attrib.emulate_tpws != 0)) &&
 643              (dev->dev_attrib.unmap_zeroes_data != 0))
 644                 buf[5] |= 0x04;
 645 
 646         return 0;
 647 }
 648 
 649 /* Referrals VPD page */
 650 static sense_reason_t
 651 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
 652 {
 653         struct se_device *dev = cmd->se_dev;
 654 
 655         buf[0] = dev->transport->get_device_type(dev);
 656         buf[3] = 0x0c;
 657         put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
 658         put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]);
 659 
 660         return 0;
 661 }
 662 
 663 static sense_reason_t
 664 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 665 
 666 static struct {
 667         uint8_t         page;
 668         sense_reason_t  (*emulate)(struct se_cmd *, unsigned char *);
 669 } evpd_handlers[] = {
 670         { .page = 0x00, .emulate = spc_emulate_evpd_00 },
 671         { .page = 0x80, .emulate = spc_emulate_evpd_80 },
 672         { .page = 0x83, .emulate = spc_emulate_evpd_83 },
 673         { .page = 0x86, .emulate = spc_emulate_evpd_86 },
 674         { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
 675         { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
 676         { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
 677         { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
 678 };
 679 
 680 /* supported vital product data pages */
 681 static sense_reason_t
 682 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf)
 683 {
 684         int p;
 685 
 686         /*
 687          * Only report the INQUIRY EVPD=1 pages after a valid NAA
 688          * Registered Extended LUN WWN has been set via ConfigFS
 689          * during device creation/restart.
 690          */
 691         if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) {
 692                 buf[3] = ARRAY_SIZE(evpd_handlers);
 693                 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p)
 694                         buf[p + 4] = evpd_handlers[p].page;
 695         }
 696 
 697         return 0;
 698 }
 699 
 700 static sense_reason_t
 701 spc_emulate_inquiry(struct se_cmd *cmd)
 702 {
 703         struct se_device *dev = cmd->se_dev;
 704         struct se_portal_group *tpg = cmd->se_lun->lun_tpg;
 705         unsigned char *rbuf;
 706         unsigned char *cdb = cmd->t_task_cdb;
 707         unsigned char *buf;
 708         sense_reason_t ret;
 709         int p;
 710         int len = 0;
 711 
 712         buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
 713         if (!buf) {
 714                 pr_err("Unable to allocate response buffer for INQUIRY\n");
 715                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 716         }
 717 
 718         if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev))
 719                 buf[0] = 0x3f; /* Not connected */
 720         else
 721                 buf[0] = dev->transport->get_device_type(dev);
 722 
 723         if (!(cdb[1] & 0x1)) {
 724                 if (cdb[2]) {
 725                         pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n",
 726                                cdb[2]);
 727                         ret = TCM_INVALID_CDB_FIELD;
 728                         goto out;
 729                 }
 730 
 731                 ret = spc_emulate_inquiry_std(cmd, buf);
 732                 len = buf[4] + 5;
 733                 goto out;
 734         }
 735 
 736         for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) {
 737                 if (cdb[2] == evpd_handlers[p].page) {
 738                         buf[1] = cdb[2];
 739                         ret = evpd_handlers[p].emulate(cmd, buf);
 740                         len = get_unaligned_be16(&buf[2]) + 4;
 741                         goto out;
 742                 }
 743         }
 744 
 745         pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]);
 746         ret = TCM_INVALID_CDB_FIELD;
 747 
 748 out:
 749         rbuf = transport_kmap_data_sg(cmd);
 750         if (rbuf) {
 751                 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
 752                 transport_kunmap_data_sg(cmd);
 753         }
 754         kfree(buf);
 755 
 756         if (!ret)
 757                 target_complete_cmd_with_length(cmd, GOOD, len);
 758         return ret;
 759 }
 760 
 761 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p)
 762 {
 763         p[0] = 0x01;
 764         p[1] = 0x0a;
 765 
 766         /* No changeable values for now */
 767         if (pc == 1)
 768                 goto out;
 769 
 770 out:
 771         return 12;
 772 }
 773 
 774 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p)
 775 {
 776         struct se_device *dev = cmd->se_dev;
 777         struct se_session *sess = cmd->se_sess;
 778 
 779         p[0] = 0x0a;
 780         p[1] = 0x0a;
 781 
 782         /* No changeable values for now */
 783         if (pc == 1)
 784                 goto out;
 785 
 786         /* GLTSD: No implicit save of log parameters */
 787         p[2] = (1 << 1);
 788         if (target_sense_desc_format(dev))
 789                 /* D_SENSE: Descriptor format sense data for 64bit sectors */
 790                 p[2] |= (1 << 2);
 791 
 792         /*
 793          * From spc4r23, 7.4.7 Control mode page
 794          *
 795          * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies
 796          * restrictions on the algorithm used for reordering commands
 797          * having the SIMPLE task attribute (see SAM-4).
 798          *
 799          *                    Table 368 -- QUEUE ALGORITHM MODIFIER field
 800          *                         Code      Description
 801          *                          0h       Restricted reordering
 802          *                          1h       Unrestricted reordering allowed
 803          *                          2h to 7h    Reserved
 804          *                          8h to Fh    Vendor specific
 805          *
 806          * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that
 807          * the device server shall order the processing sequence of commands
 808          * having the SIMPLE task attribute such that data integrity is maintained
 809          * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol
 810          * requests is halted at any time, the final value of all data observable
 811          * on the medium shall be the same as if all the commands had been processed
 812          * with the ORDERED task attribute).
 813          *
 814          * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the
 815          * device server may reorder the processing sequence of commands having the
 816          * SIMPLE task attribute in any manner. Any data integrity exposures related to
 817          * command sequence order shall be explicitly handled by the application client
 818          * through the selection of appropriate ommands and task attributes.
 819          */
 820         p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10;
 821         /*
 822          * From spc4r17, section 7.4.6 Control mode Page
 823          *
 824          * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b
 825          *
 826          * 00b: The logical unit shall clear any unit attention condition
 827          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 828          * status and shall not establish a unit attention condition when a com-
 829          * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT
 830          * status.
 831          *
 832          * 10b: The logical unit shall not clear any unit attention condition
 833          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 834          * status and shall not establish a unit attention condition when
 835          * a command is completed with BUSY, TASK SET FULL, or RESERVATION
 836          * CONFLICT status.
 837          *
 838          * 11b a The logical unit shall not clear any unit attention condition
 839          * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION
 840          * status and shall establish a unit attention condition for the
 841          * initiator port associated with the I_T nexus on which the BUSY,
 842          * TASK SET FULL, or RESERVATION CONFLICT status is being returned.
 843          * Depending on the status, the additional sense code shall be set to
 844          * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS
 845          * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE
 846          * command, a unit attention condition shall be established only once
 847          * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless
 848          * to the number of commands completed with one of those status codes.
 849          */
 850         p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 :
 851                (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00;
 852         /*
 853          * From spc4r17, section 7.4.6 Control mode Page
 854          *
 855          * Task Aborted Status (TAS) bit set to zero.
 856          *
 857          * A task aborted status (TAS) bit set to zero specifies that aborted
 858          * tasks shall be terminated by the device server without any response
 859          * to the application client. A TAS bit set to one specifies that tasks
 860          * aborted by the actions of an I_T nexus other than the I_T nexus on
 861          * which the command was received shall be completed with TASK ABORTED
 862          * status (see SAM-4).
 863          */
 864         p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
 865         /*
 866          * From spc4r30, section 7.5.7 Control mode page
 867          *
 868          * Application Tag Owner (ATO) bit set to one.
 869          *
 870          * If the ATO bit is set to one the device server shall not modify the
 871          * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
 872          * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
 873          * TAG field.
 874          */
 875         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 876                 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type)
 877                         p[5] |= 0x80;
 878         }
 879 
 880         p[8] = 0xff;
 881         p[9] = 0xff;
 882         p[11] = 30;
 883 
 884 out:
 885         return 12;
 886 }
 887 
 888 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p)
 889 {
 890         struct se_device *dev = cmd->se_dev;
 891 
 892         p[0] = 0x08;
 893         p[1] = 0x12;
 894 
 895         /* No changeable values for now */
 896         if (pc == 1)
 897                 goto out;
 898 
 899         if (target_check_wce(dev))
 900                 p[2] = 0x04; /* Write Cache Enable */
 901         p[12] = 0x20; /* Disabled Read Ahead */
 902 
 903 out:
 904         return 20;
 905 }
 906 
 907 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p)
 908 {
 909         p[0] = 0x1c;
 910         p[1] = 0x0a;
 911 
 912         /* No changeable values for now */
 913         if (pc == 1)
 914                 goto out;
 915 
 916 out:
 917         return 12;
 918 }
 919 
 920 static struct {
 921         uint8_t         page;
 922         uint8_t         subpage;
 923         int             (*emulate)(struct se_cmd *, u8, unsigned char *);
 924 } modesense_handlers[] = {
 925         { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery },
 926         { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching },
 927         { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control },
 928         { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions },
 929 };
 930 
 931 static void spc_modesense_write_protect(unsigned char *buf, int type)
 932 {
 933         /*
 934          * I believe that the WP bit (bit 7) in the mode header is the same for
 935          * all device types..
 936          */
 937         switch (type) {
 938         case TYPE_DISK:
 939         case TYPE_TAPE:
 940         default:
 941                 buf[0] |= 0x80; /* WP bit */
 942                 break;
 943         }
 944 }
 945 
 946 static void spc_modesense_dpofua(unsigned char *buf, int type)
 947 {
 948         switch (type) {
 949         case TYPE_DISK:
 950                 buf[0] |= 0x10; /* DPOFUA bit */
 951                 break;
 952         default:
 953                 break;
 954         }
 955 }
 956 
 957 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 958 {
 959         *buf++ = 8;
 960         put_unaligned_be32(min(blocks, 0xffffffffull), buf);
 961         buf += 4;
 962         put_unaligned_be32(block_size, buf);
 963         return 9;
 964 }
 965 
 966 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size)
 967 {
 968         if (blocks <= 0xffffffff)
 969                 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3;
 970 
 971         *buf++ = 1;             /* LONGLBA */
 972         buf += 2;
 973         *buf++ = 16;
 974         put_unaligned_be64(blocks, buf);
 975         buf += 12;
 976         put_unaligned_be32(block_size, buf);
 977 
 978         return 17;
 979 }
 980 
 981 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd)
 982 {
 983         struct se_device *dev = cmd->se_dev;
 984         char *cdb = cmd->t_task_cdb;
 985         unsigned char buf[SE_MODE_PAGE_BUF], *rbuf;
 986         int type = dev->transport->get_device_type(dev);
 987         int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10);
 988         bool dbd = !!(cdb[1] & 0x08);
 989         bool llba = ten ? !!(cdb[1] & 0x10) : false;
 990         u8 pc = cdb[2] >> 6;
 991         u8 page = cdb[2] & 0x3f;
 992         u8 subpage = cdb[3];
 993         int length = 0;
 994         int ret;
 995         int i;
 996 
 997         memset(buf, 0, SE_MODE_PAGE_BUF);
 998 
 999         /*
1000          * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for
1001          * MODE_SENSE_10 and byte 2 for MODE_SENSE (6).
1002          */
1003         length = ten ? 3 : 2;
1004 
1005         /* DEVICE-SPECIFIC PARAMETER */
1006         if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd))
1007                 spc_modesense_write_protect(&buf[length], type);
1008 
1009         /*
1010          * SBC only allows us to enable FUA and DPO together.  Fortunately
1011          * DPO is explicitly specified as a hint, so a noop is a perfectly
1012          * valid implementation.
1013          */
1014         if (target_check_fua(dev))
1015                 spc_modesense_dpofua(&buf[length], type);
1016 
1017         ++length;
1018 
1019         /* BLOCK DESCRIPTOR */
1020 
1021         /*
1022          * For now we only include a block descriptor for disk (SBC)
1023          * devices; other command sets use a slightly different format.
1024          */
1025         if (!dbd && type == TYPE_DISK) {
1026                 u64 blocks = dev->transport->get_blocks(dev);
1027                 u32 block_size = dev->dev_attrib.block_size;
1028 
1029                 if (ten) {
1030                         if (llba) {
1031                                 length += spc_modesense_long_blockdesc(&buf[length],
1032                                                                        blocks, block_size);
1033                         } else {
1034                                 length += 3;
1035                                 length += spc_modesense_blockdesc(&buf[length],
1036                                                                   blocks, block_size);
1037                         }
1038                 } else {
1039                         length += spc_modesense_blockdesc(&buf[length], blocks,
1040                                                           block_size);
1041                 }
1042         } else {
1043                 if (ten)
1044                         length += 4;
1045                 else
1046                         length += 1;
1047         }
1048 
1049         if (page == 0x3f) {
1050                 if (subpage != 0x00 && subpage != 0xff) {
1051                         pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage);
1052                         return TCM_INVALID_CDB_FIELD;
1053                 }
1054 
1055                 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) {
1056                         /*
1057                          * Tricky way to say all subpage 00h for
1058                          * subpage==0, all subpages for subpage==0xff
1059                          * (and we just checked above that those are
1060                          * the only two possibilities).
1061                          */
1062                         if ((modesense_handlers[i].subpage & ~subpage) == 0) {
1063                                 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1064                                 if (!ten && length + ret >= 255)
1065                                         break;
1066                                 length += ret;
1067                         }
1068                 }
1069 
1070                 goto set_length;
1071         }
1072 
1073         for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1074                 if (modesense_handlers[i].page == page &&
1075                     modesense_handlers[i].subpage == subpage) {
1076                         length += modesense_handlers[i].emulate(cmd, pc, &buf[length]);
1077                         goto set_length;
1078                 }
1079 
1080         /*
1081          * We don't intend to implement:
1082          *  - obsolete page 03h "format parameters" (checked by Solaris)
1083          */
1084         if (page != 0x03)
1085                 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n",
1086                        page, subpage);
1087 
1088         return TCM_UNKNOWN_MODE_PAGE;
1089 
1090 set_length:
1091         if (ten)
1092                 put_unaligned_be16(length - 2, buf);
1093         else
1094                 buf[0] = length - 1;
1095 
1096         rbuf = transport_kmap_data_sg(cmd);
1097         if (rbuf) {
1098                 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length));
1099                 transport_kunmap_data_sg(cmd);
1100         }
1101 
1102         target_complete_cmd_with_length(cmd, GOOD, length);
1103         return 0;
1104 }
1105 
1106 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
1107 {
1108         char *cdb = cmd->t_task_cdb;
1109         bool ten = cdb[0] == MODE_SELECT_10;
1110         int off = ten ? 8 : 4;
1111         bool pf = !!(cdb[1] & 0x10);
1112         u8 page, subpage;
1113         unsigned char *buf;
1114         unsigned char tbuf[SE_MODE_PAGE_BUF];
1115         int length;
1116         sense_reason_t ret = 0;
1117         int i;
1118 
1119         if (!cmd->data_length) {
1120                 target_complete_cmd(cmd, GOOD);
1121                 return 0;
1122         }
1123 
1124         if (cmd->data_length < off + 2)
1125                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1126 
1127         buf = transport_kmap_data_sg(cmd);
1128         if (!buf)
1129                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1130 
1131         if (!pf) {
1132                 ret = TCM_INVALID_CDB_FIELD;
1133                 goto out;
1134         }
1135 
1136         page = buf[off] & 0x3f;
1137         subpage = buf[off] & 0x40 ? buf[off + 1] : 0;
1138 
1139         for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i)
1140                 if (modesense_handlers[i].page == page &&
1141                     modesense_handlers[i].subpage == subpage) {
1142                         memset(tbuf, 0, SE_MODE_PAGE_BUF);
1143                         length = modesense_handlers[i].emulate(cmd, 0, tbuf);
1144                         goto check_contents;
1145                 }
1146 
1147         ret = TCM_UNKNOWN_MODE_PAGE;
1148         goto out;
1149 
1150 check_contents:
1151         if (cmd->data_length < off + length) {
1152                 ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
1153                 goto out;
1154         }
1155 
1156         if (memcmp(buf + off, tbuf, length))
1157                 ret = TCM_INVALID_PARAMETER_LIST;
1158 
1159 out:
1160         transport_kunmap_data_sg(cmd);
1161 
1162         if (!ret)
1163                 target_complete_cmd(cmd, GOOD);
1164         return ret;
1165 }
1166 
1167 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd)
1168 {
1169         unsigned char *cdb = cmd->t_task_cdb;
1170         unsigned char *rbuf;
1171         u8 ua_asc = 0, ua_ascq = 0;
1172         unsigned char buf[SE_SENSE_BUF];
1173         bool desc_format = target_sense_desc_format(cmd->se_dev);
1174 
1175         memset(buf, 0, SE_SENSE_BUF);
1176 
1177         if (cdb[1] & 0x01) {
1178                 pr_err("REQUEST_SENSE description emulation not"
1179                         " supported\n");
1180                 return TCM_INVALID_CDB_FIELD;
1181         }
1182 
1183         rbuf = transport_kmap_data_sg(cmd);
1184         if (!rbuf)
1185                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1186 
1187         if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))
1188                 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION,
1189                                         ua_asc, ua_ascq);
1190         else
1191                 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0);
1192 
1193         memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
1194         transport_kunmap_data_sg(cmd);
1195 
1196         target_complete_cmd(cmd, GOOD);
1197         return 0;
1198 }
1199 
1200 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd)
1201 {
1202         struct se_dev_entry *deve;
1203         struct se_session *sess = cmd->se_sess;
1204         struct se_node_acl *nacl;
1205         struct scsi_lun slun;
1206         unsigned char *buf;
1207         u32 lun_count = 0, offset = 8;
1208         __be32 len;
1209 
1210         buf = transport_kmap_data_sg(cmd);
1211         if (cmd->data_length && !buf)
1212                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1213 
1214         /*
1215          * If no struct se_session pointer is present, this struct se_cmd is
1216          * coming via a target_core_mod PASSTHROUGH op, and not through
1217          * a $FABRIC_MOD.  In that case, report LUN=0 only.
1218          */
1219         if (!sess)
1220                 goto done;
1221 
1222         nacl = sess->se_node_acl;
1223 
1224         rcu_read_lock();
1225         hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) {
1226                 /*
1227                  * We determine the correct LUN LIST LENGTH even once we
1228                  * have reached the initial allocation length.
1229                  * See SPC2-R20 7.19.
1230                  */
1231                 lun_count++;
1232                 if (offset >= cmd->data_length)
1233                         continue;
1234 
1235                 int_to_scsilun(deve->mapped_lun, &slun);
1236                 memcpy(buf + offset, &slun,
1237                        min(8u, cmd->data_length - offset));
1238                 offset += 8;
1239         }
1240         rcu_read_unlock();
1241 
1242         /*
1243          * See SPC3 r07, page 159.
1244          */
1245 done:
1246         /*
1247          * If no LUNs are accessible, report virtual LUN 0.
1248          */
1249         if (lun_count == 0) {
1250                 int_to_scsilun(0, &slun);
1251                 if (cmd->data_length > 8)
1252                         memcpy(buf + offset, &slun,
1253                                min(8u, cmd->data_length - offset));
1254                 lun_count = 1;
1255         }
1256 
1257         if (buf) {
1258                 len = cpu_to_be32(lun_count * 8);
1259                 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));
1260                 transport_kunmap_data_sg(cmd);
1261         }
1262 
1263         target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);
1264         return 0;
1265 }
1266 EXPORT_SYMBOL(spc_emulate_report_luns);
1267 
1268 static sense_reason_t
1269 spc_emulate_testunitready(struct se_cmd *cmd)
1270 {
1271         target_complete_cmd(cmd, GOOD);
1272         return 0;
1273 }
1274 
1275 sense_reason_t
1276 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
1277 {
1278         struct se_device *dev = cmd->se_dev;
1279         unsigned char *cdb = cmd->t_task_cdb;
1280 
1281         if (!dev->dev_attrib.emulate_pr &&
1282             ((cdb[0] == PERSISTENT_RESERVE_IN) ||
1283              (cdb[0] == PERSISTENT_RESERVE_OUT) ||
1284              (cdb[0] == RELEASE || cdb[0] == RELEASE_10) ||
1285              (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) {
1286                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1287         }
1288 
1289         switch (cdb[0]) {
1290         case MODE_SELECT:
1291                 *size = cdb[4];
1292                 cmd->execute_cmd = spc_emulate_modeselect;
1293                 break;
1294         case MODE_SELECT_10:
1295                 *size = get_unaligned_be16(&cdb[7]);
1296                 cmd->execute_cmd = spc_emulate_modeselect;
1297                 break;
1298         case MODE_SENSE:
1299                 *size = cdb[4];
1300                 cmd->execute_cmd = spc_emulate_modesense;
1301                 break;
1302         case MODE_SENSE_10:
1303                 *size = get_unaligned_be16(&cdb[7]);
1304                 cmd->execute_cmd = spc_emulate_modesense;
1305                 break;
1306         case LOG_SELECT:
1307         case LOG_SENSE:
1308                 *size = get_unaligned_be16(&cdb[7]);
1309                 break;
1310         case PERSISTENT_RESERVE_IN:
1311                 *size = get_unaligned_be16(&cdb[7]);
1312                 cmd->execute_cmd = target_scsi3_emulate_pr_in;
1313                 break;
1314         case PERSISTENT_RESERVE_OUT:
1315                 *size = get_unaligned_be32(&cdb[5]);
1316                 cmd->execute_cmd = target_scsi3_emulate_pr_out;
1317                 break;
1318         case RELEASE:
1319         case RELEASE_10:
1320                 if (cdb[0] == RELEASE_10)
1321                         *size = get_unaligned_be16(&cdb[7]);
1322                 else
1323                         *size = cmd->data_length;
1324 
1325                 cmd->execute_cmd = target_scsi2_reservation_release;
1326                 break;
1327         case RESERVE:
1328         case RESERVE_10:
1329                 /*
1330                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
1331                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
1332                  */
1333                 if (cdb[0] == RESERVE_10)
1334                         *size = get_unaligned_be16(&cdb[7]);
1335                 else
1336                         *size = cmd->data_length;
1337 
1338                 cmd->execute_cmd = target_scsi2_reservation_reserve;
1339                 break;
1340         case REQUEST_SENSE:
1341                 *size = cdb[4];
1342                 cmd->execute_cmd = spc_emulate_request_sense;
1343                 break;
1344         case INQUIRY:
1345                 *size = get_unaligned_be16(&cdb[3]);
1346 
1347                 /*
1348                  * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
1349                  * See spc4r17 section 5.3
1350                  */
1351                 cmd->sam_task_attr = TCM_HEAD_TAG;
1352                 cmd->execute_cmd = spc_emulate_inquiry;
1353                 break;
1354         case SECURITY_PROTOCOL_IN:
1355         case SECURITY_PROTOCOL_OUT:
1356                 *size = get_unaligned_be32(&cdb[6]);
1357                 break;
1358         case EXTENDED_COPY:
1359                 *size = get_unaligned_be32(&cdb[10]);
1360                 cmd->execute_cmd = target_do_xcopy;
1361                 break;
1362         case RECEIVE_COPY_RESULTS:
1363                 *size = get_unaligned_be32(&cdb[10]);
1364                 cmd->execute_cmd = target_do_receive_copy_results;
1365                 break;
1366         case READ_ATTRIBUTE:
1367         case WRITE_ATTRIBUTE:
1368                 *size = get_unaligned_be32(&cdb[10]);
1369                 break;
1370         case RECEIVE_DIAGNOSTIC:
1371         case SEND_DIAGNOSTIC:
1372                 *size = get_unaligned_be16(&cdb[3]);
1373                 break;
1374         case WRITE_BUFFER:
1375                 *size = get_unaligned_be24(&cdb[6]);
1376                 break;
1377         case REPORT_LUNS:
1378                 cmd->execute_cmd = spc_emulate_report_luns;
1379                 *size = get_unaligned_be32(&cdb[6]);
1380                 /*
1381                  * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
1382                  * See spc4r17 section 5.3
1383                  */
1384                 cmd->sam_task_attr = TCM_HEAD_TAG;
1385                 break;
1386         case TEST_UNIT_READY:
1387                 cmd->execute_cmd = spc_emulate_testunitready;
1388                 *size = 0;
1389                 break;
1390         case MAINTENANCE_IN:
1391                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1392                         /*
1393                          * MAINTENANCE_IN from SCC-2
1394                          * Check for emulated MI_REPORT_TARGET_PGS
1395                          */
1396                         if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) {
1397                                 cmd->execute_cmd =
1398                                         target_emulate_report_target_port_groups;
1399                         }
1400                         *size = get_unaligned_be32(&cdb[6]);
1401                 } else {
1402                         /*
1403                          * GPCMD_SEND_KEY from multi media commands
1404                          */
1405                         *size = get_unaligned_be16(&cdb[8]);
1406                 }
1407                 break;
1408         case MAINTENANCE_OUT:
1409                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
1410                         /*
1411                          * MAINTENANCE_OUT from SCC-2
1412                          * Check for emulated MO_SET_TARGET_PGS.
1413                          */
1414                         if (cdb[1] == MO_SET_TARGET_PGS) {
1415                                 cmd->execute_cmd =
1416                                         target_emulate_set_target_port_groups;
1417                         }
1418                         *size = get_unaligned_be32(&cdb[6]);
1419                 } else {
1420                         /*
1421                          * GPCMD_SEND_KEY from multi media commands
1422                          */
1423                         *size = get_unaligned_be16(&cdb[8]);
1424                 }
1425                 break;
1426         default:
1427                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1428         }
1429 
1430         return 0;
1431 }
1432 EXPORT_SYMBOL(spc_parse_cdb);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/target/target_core_spc.c

DEFINITIONS
