1 /* 2 * SCSI Primary Commands (SPC) parsing and emulation. 3 * 4 * (c) Copyright 2002-2013 Datera, Inc. 5 * 6 * Nicholas A. Bellinger <nab@kernel.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <asm/unaligned.h> 26 27 #include <scsi/scsi_proto.h> 28 #include <scsi/scsi_common.h> 29 #include <scsi/scsi_tcq.h> 30 31 #include <target/target_core_base.h> 32 #include <target/target_core_backend.h> 33 #include <target/target_core_fabric.h> 34 35 #include "target_core_internal.h" 36 #include "target_core_alua.h" 37 #include "target_core_pr.h" 38 #include "target_core_ua.h" 39 #include "target_core_xcopy.h" 40 41 static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf) 42 { 43 struct t10_alua_tg_pt_gp *tg_pt_gp; 44 45 /* 46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. 47 */ 48 buf[5] = 0x80; 49 50 /* 51 * Set TPGS field for explicit and/or implicit ALUA access type 52 * and opteration. 53 * 54 * See spc4r17 section 6.4.2 Table 135 55 */ 56 spin_lock(&lun->lun_tg_pt_gp_lock); 57 tg_pt_gp = lun->lun_tg_pt_gp; 58 if (tg_pt_gp) 59 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; 60 spin_unlock(&lun->lun_tg_pt_gp_lock); 61 } 62 63 sense_reason_t 64 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) 65 { 66 struct se_lun *lun = cmd->se_lun; 67 struct se_device *dev = cmd->se_dev; 68 struct se_session *sess = cmd->se_sess; 69 70 /* Set RMB (removable media) for tape devices */ 71 if (dev->transport->get_device_type(dev) == TYPE_TAPE) 72 buf[1] = 0x80; 73 74 buf[2] = 0x05; /* SPC-3 */ 75 76 /* 77 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 78 * 79 * SPC4 says: 80 * A RESPONSE DATA FORMAT field set to 2h indicates that the 81 * standard INQUIRY data is in the format defined in this 82 * standard. Response data format values less than 2h are 83 * obsolete. Response data format values greater than 2h are 84 * reserved. 85 */ 86 buf[3] = 2; 87 88 /* 89 * Enable SCCS and TPGS fields for Emulated ALUA 90 */ 91 spc_fill_alua_data(lun, buf); 92 93 /* 94 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY 95 */ 96 if (dev->dev_attrib.emulate_3pc) 97 buf[5] |= 0x8; 98 /* 99 * Set Protection (PROTECT) bit when DIF has been enabled on the 100 * device, and the fabric supports VERIFY + PASS. Also report 101 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI 102 * to unprotected devices. 103 */ 104 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 105 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) 106 buf[5] |= 0x1; 107 } 108 109 buf[7] = 0x2; /* CmdQue=1 */ 110 111 /* 112 * ASCII data fields described as being left-aligned shall have any 113 * unused bytes at the end of the field (i.e., highest offset) and the 114 * unused bytes shall be filled with ASCII space characters (20h). 115 */ 116 memset(&buf[8], 0x20, 117 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN); 118 memcpy(&buf[8], dev->t10_wwn.vendor, 119 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 120 memcpy(&buf[16], dev->t10_wwn.model, 121 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN)); 122 memcpy(&buf[32], dev->t10_wwn.revision, 123 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN)); 124 buf[4] = 31; /* Set additional length to 31 */ 125 126 return 0; 127 } 128 EXPORT_SYMBOL(spc_emulate_inquiry_std); 129 130 /* unit serial number */ 131 static sense_reason_t 132 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) 133 { 134 struct se_device *dev = cmd->se_dev; 135 u16 len; 136 137 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 138 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); 139 len++; /* Extra Byte for NULL Terminator */ 140 buf[3] = len; 141 } 142 return 0; 143 } 144 145 void spc_parse_naa_6h_vendor_specific(struct se_device *dev, 146 unsigned char *buf) 147 { 148 unsigned char *p = &dev->t10_wwn.unit_serial[0]; 149 int cnt; 150 bool next = true; 151 152 /* 153 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on 154 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field 155 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION 156 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL 157 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure 158 * per device uniqeness. 159 */ 160 for (cnt = 0; *p && cnt < 13; p++) { 161 int val = hex_to_bin(*p); 162 163 if (val < 0) 164 continue; 165 166 if (next) { 167 next = false; 168 buf[cnt++] |= val; 169 } else { 170 next = true; 171 buf[cnt] = val << 4; 172 } 173 } 174 } 175 176 /* 177 * Device identification VPD, for a complete list of 178 * DESIGNATOR TYPEs see spc4r17 Table 459. 179 */ 180 sense_reason_t 181 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) 182 { 183 struct se_device *dev = cmd->se_dev; 184 struct se_lun *lun = cmd->se_lun; 185 struct se_portal_group *tpg = NULL; 186 struct t10_alua_lu_gp_member *lu_gp_mem; 187 struct t10_alua_tg_pt_gp *tg_pt_gp; 188 unsigned char *prod = &dev->t10_wwn.model[0]; 189 u32 prod_len; 190 u32 unit_serial_len, off = 0; 191 u16 len = 0, id_len; 192 193 off = 4; 194 195 /* 196 * NAA IEEE Registered Extended Assigned designator format, see 197 * spc4r17 section 7.7.3.6.5 198 * 199 * We depend upon a target_core_mod/ConfigFS provided 200 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial 201 * value in order to return the NAA id. 202 */ 203 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)) 204 goto check_t10_vend_desc; 205 206 /* CODE SET == Binary */ 207 buf[off++] = 0x1; 208 209 /* Set ASSOCIATION == addressed logical unit: 0)b */ 210 buf[off] = 0x00; 211 212 /* Identifier/Designator type == NAA identifier */ 213 buf[off++] |= 0x3; 214 off++; 215 216 /* Identifier/Designator length */ 217 buf[off++] = 0x10; 218 219 /* 220 * Start NAA IEEE Registered Extended Identifier/Designator 221 */ 222 buf[off++] = (0x6 << 4); 223 224 /* 225 * Use OpenFabrics IEEE Company ID: 00 14 05 226 */ 227 buf[off++] = 0x01; 228 buf[off++] = 0x40; 229 buf[off] = (0x5 << 4); 230 231 /* 232 * Return ConfigFS Unit Serial Number information for 233 * VENDOR_SPECIFIC_IDENTIFIER and 234 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION 235 */ 236 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 237 238 len = 20; 239 off = (len + 4); 240 241 check_t10_vend_desc: 242 /* 243 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 244 */ 245 id_len = 8; /* For Vendor field */ 246 prod_len = 4; /* For VPD Header */ 247 prod_len += 8; /* For Vendor field */ 248 prod_len += strlen(prod); 249 prod_len++; /* For : */ 250 251 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 252 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); 253 unit_serial_len++; /* For NULL Terminator */ 254 255 id_len += sprintf(&buf[off+12], "%s:%s", prod, 256 &dev->t10_wwn.unit_serial[0]); 257 } 258 buf[off] = 0x2; /* ASCII */ 259 buf[off+1] = 0x1; /* T10 Vendor ID */ 260 buf[off+2] = 0x0; 261 /* left align Vendor ID and pad with spaces */ 262 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN); 263 memcpy(&buf[off+4], dev->t10_wwn.vendor, 264 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 265 /* Extra Byte for NULL Terminator */ 266 id_len++; 267 /* Identifier Length */ 268 buf[off+3] = id_len; 269 /* Header size for Designation descriptor */ 270 len += (id_len + 4); 271 off += (id_len + 4); 272 273 if (1) { 274 struct t10_alua_lu_gp *lu_gp; 275 u32 padding, scsi_name_len, scsi_target_len; 276 u16 lu_gp_id = 0; 277 u16 tg_pt_gp_id = 0; 278 u16 tpgt; 279 280 tpg = lun->lun_tpg; 281 /* 282 * Relative target port identifer, see spc4r17 283 * section 7.7.3.7 284 * 285 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 286 * section 7.5.1 Table 362 287 */ 288 buf[off] = tpg->proto_id << 4; 289 buf[off++] |= 0x1; /* CODE SET == Binary */ 290 buf[off] = 0x80; /* Set PIV=1 */ 291 /* Set ASSOCIATION == target port: 01b */ 292 buf[off] |= 0x10; 293 /* DESIGNATOR TYPE == Relative target port identifer */ 294 buf[off++] |= 0x4; 295 off++; /* Skip over Reserved */ 296 buf[off++] = 4; /* DESIGNATOR LENGTH */ 297 /* Skip over Obsolete field in RTPI payload 298 * in Table 472 */ 299 off += 2; 300 put_unaligned_be16(lun->lun_rtpi, &buf[off]); 301 off += 2; 302 len += 8; /* Header size + Designation descriptor */ 303 /* 304 * Target port group identifier, see spc4r17 305 * section 7.7.3.8 306 * 307 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 308 * section 7.5.1 Table 362 309 */ 310 spin_lock(&lun->lun_tg_pt_gp_lock); 311 tg_pt_gp = lun->lun_tg_pt_gp; 312 if (!tg_pt_gp) { 313 spin_unlock(&lun->lun_tg_pt_gp_lock); 314 goto check_lu_gp; 315 } 316 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 317 spin_unlock(&lun->lun_tg_pt_gp_lock); 318 319 buf[off] = tpg->proto_id << 4; 320 buf[off++] |= 0x1; /* CODE SET == Binary */ 321 buf[off] = 0x80; /* Set PIV=1 */ 322 /* Set ASSOCIATION == target port: 01b */ 323 buf[off] |= 0x10; 324 /* DESIGNATOR TYPE == Target port group identifier */ 325 buf[off++] |= 0x5; 326 off++; /* Skip over Reserved */ 327 buf[off++] = 4; /* DESIGNATOR LENGTH */ 328 off += 2; /* Skip over Reserved Field */ 329 put_unaligned_be16(tg_pt_gp_id, &buf[off]); 330 off += 2; 331 len += 8; /* Header size + Designation descriptor */ 332 /* 333 * Logical Unit Group identifier, see spc4r17 334 * section 7.7.3.8 335 */ 336 check_lu_gp: 337 lu_gp_mem = dev->dev_alua_lu_gp_mem; 338 if (!lu_gp_mem) 339 goto check_scsi_name; 340 341 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 342 lu_gp = lu_gp_mem->lu_gp; 343 if (!lu_gp) { 344 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 345 goto check_scsi_name; 346 } 347 lu_gp_id = lu_gp->lu_gp_id; 348 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 349 350 buf[off++] |= 0x1; /* CODE SET == Binary */ 351 /* DESIGNATOR TYPE == Logical Unit Group identifier */ 352 buf[off++] |= 0x6; 353 off++; /* Skip over Reserved */ 354 buf[off++] = 4; /* DESIGNATOR LENGTH */ 355 off += 2; /* Skip over Reserved Field */ 356 put_unaligned_be16(lu_gp_id, &buf[off]); 357 off += 2; 358 len += 8; /* Header size + Designation descriptor */ 359 /* 360 * SCSI name string designator, see spc4r17 361 * section 7.7.3.11 362 * 363 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 364 * section 7.5.1 Table 362 365 */ 366 check_scsi_name: 367 buf[off] = tpg->proto_id << 4; 368 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 369 buf[off] = 0x80; /* Set PIV=1 */ 370 /* Set ASSOCIATION == target port: 01b */ 371 buf[off] |= 0x10; 372 /* DESIGNATOR TYPE == SCSI name string */ 373 buf[off++] |= 0x8; 374 off += 2; /* Skip over Reserved and length */ 375 /* 376 * SCSI name string identifer containing, $FABRIC_MOD 377 * dependent information. For LIO-Target and iSCSI 378 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in 379 * UTF-8 encoding. 380 */ 381 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 382 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", 383 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); 384 scsi_name_len += 1 /* Include NULL terminator */; 385 /* 386 * The null-terminated, null-padded (see 4.4.2) SCSI 387 * NAME STRING field contains a UTF-8 format string. 388 * The number of bytes in the SCSI NAME STRING field 389 * (i.e., the value in the DESIGNATOR LENGTH field) 390 * shall be no larger than 256 and shall be a multiple 391 * of four. 392 */ 393 padding = ((-scsi_name_len) & 3); 394 if (padding) 395 scsi_name_len += padding; 396 if (scsi_name_len > 256) 397 scsi_name_len = 256; 398 399 buf[off-1] = scsi_name_len; 400 off += scsi_name_len; 401 /* Header size + Designation descriptor */ 402 len += (scsi_name_len + 4); 403 404 /* 405 * Target device designator 406 */ 407 buf[off] = tpg->proto_id << 4; 408 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 409 buf[off] = 0x80; /* Set PIV=1 */ 410 /* Set ASSOCIATION == target device: 10b */ 411 buf[off] |= 0x20; 412 /* DESIGNATOR TYPE == SCSI name string */ 413 buf[off++] |= 0x8; 414 off += 2; /* Skip over Reserved and length */ 415 /* 416 * SCSI name string identifer containing, $FABRIC_MOD 417 * dependent information. For LIO-Target and iSCSI 418 * Target Port, this means "<iSCSI name>" in 419 * UTF-8 encoding. 420 */ 421 scsi_target_len = sprintf(&buf[off], "%s", 422 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 423 scsi_target_len += 1 /* Include NULL terminator */; 424 /* 425 * The null-terminated, null-padded (see 4.4.2) SCSI 426 * NAME STRING field contains a UTF-8 format string. 427 * The number of bytes in the SCSI NAME STRING field 428 * (i.e., the value in the DESIGNATOR LENGTH field) 429 * shall be no larger than 256 and shall be a multiple 430 * of four. 431 */ 432 padding = ((-scsi_target_len) & 3); 433 if (padding) 434 scsi_target_len += padding; 435 if (scsi_target_len > 256) 436 scsi_target_len = 256; 437 438 buf[off-1] = scsi_target_len; 439 off += scsi_target_len; 440 441 /* Header size + Designation descriptor */ 442 len += (scsi_target_len + 4); 443 } 444 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */ 445 return 0; 446 } 447 EXPORT_SYMBOL(spc_emulate_evpd_83); 448 449 /* Extended INQUIRY Data VPD Page */ 450 static sense_reason_t 451 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) 452 { 453 struct se_device *dev = cmd->se_dev; 454 struct se_session *sess = cmd->se_sess; 455 456 buf[3] = 0x3c; 457 /* 458 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK 459 * only for TYPE3 protection. 460 */ 461 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 462 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || 463 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) 464 buf[4] = 0x5; 465 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || 466 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) 467 buf[4] = 0x4; 468 } 469 470 /* logical unit supports type 1 and type 3 protection */ 471 if ((dev->transport->get_device_type(dev) == TYPE_DISK) && 472 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) && 473 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) { 474 buf[4] |= (0x3 << 3); 475 } 476 477 /* Set HEADSUP, ORDSUP, SIMPSUP */ 478 buf[5] = 0x07; 479 480 /* If WriteCache emulation is enabled, set V_SUP */ 481 if (target_check_wce(dev)) 482 buf[6] = 0x01; 483 /* If an LBA map is present set R_SUP */ 484 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); 485 if (!list_empty(&dev->t10_alua.lba_map_list)) 486 buf[8] = 0x10; 487 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); 488 return 0; 489 } 490 491 /* Block Limits VPD page */ 492 static sense_reason_t 493 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) 494 { 495 struct se_device *dev = cmd->se_dev; 496 u32 mtl = 0; 497 int have_tp = 0, opt, min; 498 499 /* 500 * Following spc3r22 section 6.5.3 Block Limits VPD page, when 501 * emulate_tpu=1 or emulate_tpws=1 we will be expect a 502 * different page length for Thin Provisioning. 503 */ 504 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 505 have_tp = 1; 506 507 buf[0] = dev->transport->get_device_type(dev); 508 buf[3] = have_tp ? 0x3c : 0x10; 509 510 /* Set WSNZ to 1 */ 511 buf[4] = 0x01; 512 /* 513 * Set MAXIMUM COMPARE AND WRITE LENGTH 514 */ 515 if (dev->dev_attrib.emulate_caw) 516 buf[5] = 0x01; 517 518 /* 519 * Set OPTIMAL TRANSFER LENGTH GRANULARITY 520 */ 521 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) 522 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); 523 else 524 put_unaligned_be16(1, &buf[6]); 525 526 /* 527 * Set MAXIMUM TRANSFER LENGTH 528 * 529 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics 530 * enforcing maximum HW scatter-gather-list entry limit 531 */ 532 if (cmd->se_tfo->max_data_sg_nents) { 533 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) / 534 dev->dev_attrib.block_size; 535 } 536 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]); 537 538 /* 539 * Set OPTIMAL TRANSFER LENGTH 540 */ 541 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) 542 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); 543 else 544 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); 545 546 /* 547 * Exit now if we don't support TP. 548 */ 549 if (!have_tp) 550 goto max_write_same; 551 552 /* 553 * Set MAXIMUM UNMAP LBA COUNT 554 */ 555 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); 556 557 /* 558 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT 559 */ 560 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, 561 &buf[24]); 562 563 /* 564 * Set OPTIMAL UNMAP GRANULARITY 565 */ 566 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); 567 568 /* 569 * UNMAP GRANULARITY ALIGNMENT 570 */ 571 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, 572 &buf[32]); 573 if (dev->dev_attrib.unmap_granularity_alignment != 0) 574 buf[32] |= 0x80; /* Set the UGAVALID bit */ 575 576 /* 577 * MAXIMUM WRITE SAME LENGTH 578 */ 579 max_write_same: 580 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); 581 582 return 0; 583 } 584 585 /* Block Device Characteristics VPD page */ 586 static sense_reason_t 587 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) 588 { 589 struct se_device *dev = cmd->se_dev; 590 591 buf[0] = dev->transport->get_device_type(dev); 592 buf[3] = 0x3c; 593 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0; 594 595 return 0; 596 } 597 598 /* Thin Provisioning VPD */ 599 static sense_reason_t 600 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) 601 { 602 struct se_device *dev = cmd->se_dev; 603 604 /* 605 * From spc3r22 section 6.5.4 Thin Provisioning VPD page: 606 * 607 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to 608 * zero, then the page length shall be set to 0004h. If the DP bit 609 * is set to one, then the page length shall be set to the value 610 * defined in table 162. 611 */ 612 buf[0] = dev->transport->get_device_type(dev); 613 614 /* 615 * Set Hardcoded length mentioned above for DP=0 616 */ 617 put_unaligned_be16(0x0004, &buf[2]); 618 619 /* 620 * The THRESHOLD EXPONENT field indicates the threshold set size in 621 * LBAs as a power of 2 (i.e., the threshold set size is equal to 622 * 2(threshold exponent)). 623 * 624 * Note that this is currently set to 0x00 as mkp says it will be 625 * changing again. We can enable this once it has settled in T10 626 * and is actually used by Linux/SCSI ML code. 627 */ 628 buf[4] = 0x00; 629 630 /* 631 * A TPU bit set to one indicates that the device server supports 632 * the UNMAP command (see 5.25). A TPU bit set to zero indicates 633 * that the device server does not support the UNMAP command. 634 */ 635 if (dev->dev_attrib.emulate_tpu != 0) 636 buf[5] = 0x80; 637 638 /* 639 * A TPWS bit set to one indicates that the device server supports 640 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. 641 * A TPWS bit set to zero indicates that the device server does not 642 * support the use of the WRITE SAME (16) command to unmap LBAs. 643 */ 644 if (dev->dev_attrib.emulate_tpws != 0) 645 buf[5] |= 0x40 | 0x20; 646 647 /* 648 * The unmap_zeroes_data set means that the underlying device supports 649 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This 650 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent 651 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA 652 * See sbc4r36 6.6.4. 653 */ 654 if (((dev->dev_attrib.emulate_tpu != 0) || 655 (dev->dev_attrib.emulate_tpws != 0)) && 656 (dev->dev_attrib.unmap_zeroes_data != 0)) 657 buf[5] |= 0x04; 658 659 return 0; 660 } 661 662 /* Referrals VPD page */ 663 static sense_reason_t 664 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) 665 { 666 struct se_device *dev = cmd->se_dev; 667 668 buf[0] = dev->transport->get_device_type(dev); 669 buf[3] = 0x0c; 670 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); 671 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); 672 673 return 0; 674 } 675 676 static sense_reason_t 677 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); 678 679 static struct { 680 uint8_t page; 681 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *); 682 } evpd_handlers[] = { 683 { .page = 0x00, .emulate = spc_emulate_evpd_00 }, 684 { .page = 0x80, .emulate = spc_emulate_evpd_80 }, 685 { .page = 0x83, .emulate = spc_emulate_evpd_83 }, 686 { .page = 0x86, .emulate = spc_emulate_evpd_86 }, 687 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, 688 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, 689 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, 690 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, 691 }; 692 693 /* supported vital product data pages */ 694 static sense_reason_t 695 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) 696 { 697 int p; 698 699 /* 700 * Only report the INQUIRY EVPD=1 pages after a valid NAA 701 * Registered Extended LUN WWN has been set via ConfigFS 702 * during device creation/restart. 703 */ 704 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 705 buf[3] = ARRAY_SIZE(evpd_handlers); 706 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) 707 buf[p + 4] = evpd_handlers[p].page; 708 } 709 710 return 0; 711 } 712 713 static sense_reason_t 714 spc_emulate_inquiry(struct se_cmd *cmd) 715 { 716 struct se_device *dev = cmd->se_dev; 717 struct se_portal_group *tpg = cmd->se_lun->lun_tpg; 718 unsigned char *rbuf; 719 unsigned char *cdb = cmd->t_task_cdb; 720 unsigned char *buf; 721 sense_reason_t ret; 722 int p; 723 int len = 0; 724 725 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); 726 if (!buf) { 727 pr_err("Unable to allocate response buffer for INQUIRY\n"); 728 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 729 } 730 731 if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev)) 732 buf[0] = 0x3f; /* Not connected */ 733 else 734 buf[0] = dev->transport->get_device_type(dev); 735 736 if (!(cdb[1] & 0x1)) { 737 if (cdb[2]) { 738 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", 739 cdb[2]); 740 ret = TCM_INVALID_CDB_FIELD; 741 goto out; 742 } 743 744 ret = spc_emulate_inquiry_std(cmd, buf); 745 len = buf[4] + 5; 746 goto out; 747 } 748 749 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { 750 if (cdb[2] == evpd_handlers[p].page) { 751 buf[1] = cdb[2]; 752 ret = evpd_handlers[p].emulate(cmd, buf); 753 len = get_unaligned_be16(&buf[2]) + 4; 754 goto out; 755 } 756 } 757 758 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); 759 ret = TCM_INVALID_CDB_FIELD; 760 761 out: 762 rbuf = transport_kmap_data_sg(cmd); 763 if (rbuf) { 764 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); 765 transport_kunmap_data_sg(cmd); 766 } 767 kfree(buf); 768 769 if (!ret) 770 target_complete_cmd_with_length(cmd, GOOD, len); 771 return ret; 772 } 773 774 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) 775 { 776 p[0] = 0x01; 777 p[1] = 0x0a; 778 779 /* No changeable values for now */ 780 if (pc == 1) 781 goto out; 782 783 out: 784 return 12; 785 } 786 787 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) 788 { 789 struct se_device *dev = cmd->se_dev; 790 struct se_session *sess = cmd->se_sess; 791 792 p[0] = 0x0a; 793 p[1] = 0x0a; 794 795 /* No changeable values for now */ 796 if (pc == 1) 797 goto out; 798 799 /* GLTSD: No implicit save of log parameters */ 800 p[2] = (1 << 1); 801 if (target_sense_desc_format(dev)) 802 /* D_SENSE: Descriptor format sense data for 64bit sectors */ 803 p[2] |= (1 << 2); 804 805 /* 806 * From spc4r23, 7.4.7 Control mode page 807 * 808 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies 809 * restrictions on the algorithm used for reordering commands 810 * having the SIMPLE task attribute (see SAM-4). 811 * 812 * Table 368 -- QUEUE ALGORITHM MODIFIER field 813 * Code Description 814 * 0h Restricted reordering 815 * 1h Unrestricted reordering allowed 816 * 2h to 7h Reserved 817 * 8h to Fh Vendor specific 818 * 819 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that 820 * the device server shall order the processing sequence of commands 821 * having the SIMPLE task attribute such that data integrity is maintained 822 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol 823 * requests is halted at any time, the final value of all data observable 824 * on the medium shall be the same as if all the commands had been processed 825 * with the ORDERED task attribute). 826 * 827 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the 828 * device server may reorder the processing sequence of commands having the 829 * SIMPLE task attribute in any manner. Any data integrity exposures related to 830 * command sequence order shall be explicitly handled by the application client 831 * through the selection of appropriate ommands and task attributes. 832 */ 833 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; 834 /* 835 * From spc4r17, section 7.4.6 Control mode Page 836 * 837 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 838 * 839 * 00b: The logical unit shall clear any unit attention condition 840 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 841 * status and shall not establish a unit attention condition when a com- 842 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 843 * status. 844 * 845 * 10b: The logical unit shall not clear any unit attention condition 846 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 847 * status and shall not establish a unit attention condition when 848 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 849 * CONFLICT status. 850 * 851 * 11b a The logical unit shall not clear any unit attention condition 852 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 853 * status and shall establish a unit attention condition for the 854 * initiator port associated with the I_T nexus on which the BUSY, 855 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 856 * Depending on the status, the additional sense code shall be set to 857 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 858 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 859 * command, a unit attention condition shall be established only once 860 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 861 * to the number of commands completed with one of those status codes. 862 */ 863 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : 864 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00; 865 /* 866 * From spc4r17, section 7.4.6 Control mode Page 867 * 868 * Task Aborted Status (TAS) bit set to zero. 869 * 870 * A task aborted status (TAS) bit set to zero specifies that aborted 871 * tasks shall be terminated by the device server without any response 872 * to the application client. A TAS bit set to one specifies that tasks 873 * aborted by the actions of an I_T nexus other than the I_T nexus on 874 * which the command was received shall be completed with TASK ABORTED 875 * status (see SAM-4). 876 */ 877 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 878 /* 879 * From spc4r30, section 7.5.7 Control mode page 880 * 881 * Application Tag Owner (ATO) bit set to one. 882 * 883 * If the ATO bit is set to one the device server shall not modify the 884 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 885 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 886 * TAG field. 887 */ 888 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 889 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 890 p[5] |= 0x80; 891 } 892 893 p[8] = 0xff; 894 p[9] = 0xff; 895 p[11] = 30; 896 897 out: 898 return 12; 899 } 900 901 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 902 { 903 struct se_device *dev = cmd->se_dev; 904 905 p[0] = 0x08; 906 p[1] = 0x12; 907 908 /* No changeable values for now */ 909 if (pc == 1) 910 goto out; 911 912 if (target_check_wce(dev)) 913 p[2] = 0x04; /* Write Cache Enable */ 914 p[12] = 0x20; /* Disabled Read Ahead */ 915 916 out: 917 return 20; 918 } 919 920 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 921 { 922 p[0] = 0x1c; 923 p[1] = 0x0a; 924 925 /* No changeable values for now */ 926 if (pc == 1) 927 goto out; 928 929 out: 930 return 12; 931 } 932 933 static struct { 934 uint8_t page; 935 uint8_t subpage; 936 int (*emulate)(struct se_cmd *, u8, unsigned char *); 937 } modesense_handlers[] = { 938 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 939 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 940 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 941 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 942 }; 943 944 static void spc_modesense_write_protect(unsigned char *buf, int type) 945 { 946 /* 947 * I believe that the WP bit (bit 7) in the mode header is the same for 948 * all device types.. 949 */ 950 switch (type) { 951 case TYPE_DISK: 952 case TYPE_TAPE: 953 default: 954 buf[0] |= 0x80; /* WP bit */ 955 break; 956 } 957 } 958 959 static void spc_modesense_dpofua(unsigned char *buf, int type) 960 { 961 switch (type) { 962 case TYPE_DISK: 963 buf[0] |= 0x10; /* DPOFUA bit */ 964 break; 965 default: 966 break; 967 } 968 } 969 970 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 971 { 972 *buf++ = 8; 973 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 974 buf += 4; 975 put_unaligned_be32(block_size, buf); 976 return 9; 977 } 978 979 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 980 { 981 if (blocks <= 0xffffffff) 982 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 983 984 *buf++ = 1; /* LONGLBA */ 985 buf += 2; 986 *buf++ = 16; 987 put_unaligned_be64(blocks, buf); 988 buf += 12; 989 put_unaligned_be32(block_size, buf); 990 991 return 17; 992 } 993 994 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 995 { 996 struct se_device *dev = cmd->se_dev; 997 char *cdb = cmd->t_task_cdb; 998 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 999 int type = dev->transport->get_device_type(dev); 1000 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 1001 bool dbd = !!(cdb[1] & 0x08); 1002 bool llba = ten ? !!(cdb[1] & 0x10) : false; 1003 u8 pc = cdb[2] >> 6; 1004 u8 page = cdb[2] & 0x3f; 1005 u8 subpage = cdb[3]; 1006 int length = 0; 1007 int ret; 1008 int i; 1009 1010 memset(buf, 0, SE_MODE_PAGE_BUF); 1011 1012 /* 1013 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1014 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1015 */ 1016 length = ten ? 3 : 2; 1017 1018 /* DEVICE-SPECIFIC PARAMETER */ 1019 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1020 spc_modesense_write_protect(&buf[length], type); 1021 1022 /* 1023 * SBC only allows us to enable FUA and DPO together. Fortunately 1024 * DPO is explicitly specified as a hint, so a noop is a perfectly 1025 * valid implementation. 1026 */ 1027 if (target_check_fua(dev)) 1028 spc_modesense_dpofua(&buf[length], type); 1029 1030 ++length; 1031 1032 /* BLOCK DESCRIPTOR */ 1033 1034 /* 1035 * For now we only include a block descriptor for disk (SBC) 1036 * devices; other command sets use a slightly different format. 1037 */ 1038 if (!dbd && type == TYPE_DISK) { 1039 u64 blocks = dev->transport->get_blocks(dev); 1040 u32 block_size = dev->dev_attrib.block_size; 1041 1042 if (ten) { 1043 if (llba) { 1044 length += spc_modesense_long_blockdesc(&buf[length], 1045 blocks, block_size); 1046 } else { 1047 length += 3; 1048 length += spc_modesense_blockdesc(&buf[length], 1049 blocks, block_size); 1050 } 1051 } else { 1052 length += spc_modesense_blockdesc(&buf[length], blocks, 1053 block_size); 1054 } 1055 } else { 1056 if (ten) 1057 length += 4; 1058 else 1059 length += 1; 1060 } 1061 1062 if (page == 0x3f) { 1063 if (subpage != 0x00 && subpage != 0xff) { 1064 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1065 return TCM_INVALID_CDB_FIELD; 1066 } 1067 1068 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1069 /* 1070 * Tricky way to say all subpage 00h for 1071 * subpage==0, all subpages for subpage==0xff 1072 * (and we just checked above that those are 1073 * the only two possibilities). 1074 */ 1075 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1076 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1077 if (!ten && length + ret >= 255) 1078 break; 1079 length += ret; 1080 } 1081 } 1082 1083 goto set_length; 1084 } 1085 1086 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1087 if (modesense_handlers[i].page == page && 1088 modesense_handlers[i].subpage == subpage) { 1089 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1090 goto set_length; 1091 } 1092 1093 /* 1094 * We don't intend to implement: 1095 * - obsolete page 03h "format parameters" (checked by Solaris) 1096 */ 1097 if (page != 0x03) 1098 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1099 page, subpage); 1100 1101 return TCM_UNKNOWN_MODE_PAGE; 1102 1103 set_length: 1104 if (ten) 1105 put_unaligned_be16(length - 2, buf); 1106 else 1107 buf[0] = length - 1; 1108 1109 rbuf = transport_kmap_data_sg(cmd); 1110 if (rbuf) { 1111 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1112 transport_kunmap_data_sg(cmd); 1113 } 1114 1115 target_complete_cmd_with_length(cmd, GOOD, length); 1116 return 0; 1117 } 1118 1119 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1120 { 1121 char *cdb = cmd->t_task_cdb; 1122 bool ten = cdb[0] == MODE_SELECT_10; 1123 int off = ten ? 8 : 4; 1124 bool pf = !!(cdb[1] & 0x10); 1125 u8 page, subpage; 1126 unsigned char *buf; 1127 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1128 int length; 1129 sense_reason_t ret = 0; 1130 int i; 1131 1132 if (!cmd->data_length) { 1133 target_complete_cmd(cmd, GOOD); 1134 return 0; 1135 } 1136 1137 if (cmd->data_length < off + 2) 1138 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1139 1140 buf = transport_kmap_data_sg(cmd); 1141 if (!buf) 1142 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1143 1144 if (!pf) { 1145 ret = TCM_INVALID_CDB_FIELD; 1146 goto out; 1147 } 1148 1149 page = buf[off] & 0x3f; 1150 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1151 1152 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1153 if (modesense_handlers[i].page == page && 1154 modesense_handlers[i].subpage == subpage) { 1155 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1156 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1157 goto check_contents; 1158 } 1159 1160 ret = TCM_UNKNOWN_MODE_PAGE; 1161 goto out; 1162 1163 check_contents: 1164 if (cmd->data_length < off + length) { 1165 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1166 goto out; 1167 } 1168 1169 if (memcmp(buf + off, tbuf, length)) 1170 ret = TCM_INVALID_PARAMETER_LIST; 1171 1172 out: 1173 transport_kunmap_data_sg(cmd); 1174 1175 if (!ret) 1176 target_complete_cmd(cmd, GOOD); 1177 return ret; 1178 } 1179 1180 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1181 { 1182 unsigned char *cdb = cmd->t_task_cdb; 1183 unsigned char *rbuf; 1184 u8 ua_asc = 0, ua_ascq = 0; 1185 unsigned char buf[SE_SENSE_BUF]; 1186 bool desc_format = target_sense_desc_format(cmd->se_dev); 1187 1188 memset(buf, 0, SE_SENSE_BUF); 1189 1190 if (cdb[1] & 0x01) { 1191 pr_err("REQUEST_SENSE description emulation not" 1192 " supported\n"); 1193 return TCM_INVALID_CDB_FIELD; 1194 } 1195 1196 rbuf = transport_kmap_data_sg(cmd); 1197 if (!rbuf) 1198 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1199 1200 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1201 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1202 ua_asc, ua_ascq); 1203 else 1204 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1205 1206 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1207 transport_kunmap_data_sg(cmd); 1208 1209 target_complete_cmd(cmd, GOOD); 1210 return 0; 1211 } 1212 1213 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1214 { 1215 struct se_dev_entry *deve; 1216 struct se_session *sess = cmd->se_sess; 1217 struct se_node_acl *nacl; 1218 struct scsi_lun slun; 1219 unsigned char *buf; 1220 u32 lun_count = 0, offset = 8; 1221 __be32 len; 1222 1223 buf = transport_kmap_data_sg(cmd); 1224 if (cmd->data_length && !buf) 1225 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1226 1227 /* 1228 * If no struct se_session pointer is present, this struct se_cmd is 1229 * coming via a target_core_mod PASSTHROUGH op, and not through 1230 * a $FABRIC_MOD. In that case, report LUN=0 only. 1231 */ 1232 if (!sess) 1233 goto done; 1234 1235 nacl = sess->se_node_acl; 1236 1237 rcu_read_lock(); 1238 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1239 /* 1240 * We determine the correct LUN LIST LENGTH even once we 1241 * have reached the initial allocation length. 1242 * See SPC2-R20 7.19. 1243 */ 1244 lun_count++; 1245 if (offset >= cmd->data_length) 1246 continue; 1247 1248 int_to_scsilun(deve->mapped_lun, &slun); 1249 memcpy(buf + offset, &slun, 1250 min(8u, cmd->data_length - offset)); 1251 offset += 8; 1252 } 1253 rcu_read_unlock(); 1254 1255 /* 1256 * See SPC3 r07, page 159. 1257 */ 1258 done: 1259 /* 1260 * If no LUNs are accessible, report virtual LUN 0. 1261 */ 1262 if (lun_count == 0) { 1263 int_to_scsilun(0, &slun); 1264 if (cmd->data_length > 8) 1265 memcpy(buf + offset, &slun, 1266 min(8u, cmd->data_length - offset)); 1267 lun_count = 1; 1268 } 1269 1270 if (buf) { 1271 len = cpu_to_be32(lun_count * 8); 1272 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1273 transport_kunmap_data_sg(cmd); 1274 } 1275 1276 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); 1277 return 0; 1278 } 1279 EXPORT_SYMBOL(spc_emulate_report_luns); 1280 1281 static sense_reason_t 1282 spc_emulate_testunitready(struct se_cmd *cmd) 1283 { 1284 target_complete_cmd(cmd, GOOD); 1285 return 0; 1286 } 1287 1288 sense_reason_t 1289 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1290 { 1291 struct se_device *dev = cmd->se_dev; 1292 unsigned char *cdb = cmd->t_task_cdb; 1293 1294 if (!dev->dev_attrib.emulate_pr && 1295 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1296 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1297 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1298 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1299 return TCM_UNSUPPORTED_SCSI_OPCODE; 1300 } 1301 1302 switch (cdb[0]) { 1303 case MODE_SELECT: 1304 *size = cdb[4]; 1305 cmd->execute_cmd = spc_emulate_modeselect; 1306 break; 1307 case MODE_SELECT_10: 1308 *size = get_unaligned_be16(&cdb[7]); 1309 cmd->execute_cmd = spc_emulate_modeselect; 1310 break; 1311 case MODE_SENSE: 1312 *size = cdb[4]; 1313 cmd->execute_cmd = spc_emulate_modesense; 1314 break; 1315 case MODE_SENSE_10: 1316 *size = get_unaligned_be16(&cdb[7]); 1317 cmd->execute_cmd = spc_emulate_modesense; 1318 break; 1319 case LOG_SELECT: 1320 case LOG_SENSE: 1321 *size = get_unaligned_be16(&cdb[7]); 1322 break; 1323 case PERSISTENT_RESERVE_IN: 1324 *size = get_unaligned_be16(&cdb[7]); 1325 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1326 break; 1327 case PERSISTENT_RESERVE_OUT: 1328 *size = get_unaligned_be32(&cdb[5]); 1329 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1330 break; 1331 case RELEASE: 1332 case RELEASE_10: 1333 if (cdb[0] == RELEASE_10) 1334 *size = get_unaligned_be16(&cdb[7]); 1335 else 1336 *size = cmd->data_length; 1337 1338 cmd->execute_cmd = target_scsi2_reservation_release; 1339 break; 1340 case RESERVE: 1341 case RESERVE_10: 1342 /* 1343 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1344 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1345 */ 1346 if (cdb[0] == RESERVE_10) 1347 *size = get_unaligned_be16(&cdb[7]); 1348 else 1349 *size = cmd->data_length; 1350 1351 cmd->execute_cmd = target_scsi2_reservation_reserve; 1352 break; 1353 case REQUEST_SENSE: 1354 *size = cdb[4]; 1355 cmd->execute_cmd = spc_emulate_request_sense; 1356 break; 1357 case INQUIRY: 1358 *size = get_unaligned_be16(&cdb[3]); 1359 1360 /* 1361 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1362 * See spc4r17 section 5.3 1363 */ 1364 cmd->sam_task_attr = TCM_HEAD_TAG; 1365 cmd->execute_cmd = spc_emulate_inquiry; 1366 break; 1367 case SECURITY_PROTOCOL_IN: 1368 case SECURITY_PROTOCOL_OUT: 1369 *size = get_unaligned_be32(&cdb[6]); 1370 break; 1371 case EXTENDED_COPY: 1372 *size = get_unaligned_be32(&cdb[10]); 1373 cmd->execute_cmd = target_do_xcopy; 1374 break; 1375 case RECEIVE_COPY_RESULTS: 1376 *size = get_unaligned_be32(&cdb[10]); 1377 cmd->execute_cmd = target_do_receive_copy_results; 1378 break; 1379 case READ_ATTRIBUTE: 1380 case WRITE_ATTRIBUTE: 1381 *size = get_unaligned_be32(&cdb[10]); 1382 break; 1383 case RECEIVE_DIAGNOSTIC: 1384 case SEND_DIAGNOSTIC: 1385 *size = get_unaligned_be16(&cdb[3]); 1386 break; 1387 case WRITE_BUFFER: 1388 *size = get_unaligned_be24(&cdb[6]); 1389 break; 1390 case REPORT_LUNS: 1391 cmd->execute_cmd = spc_emulate_report_luns; 1392 *size = get_unaligned_be32(&cdb[6]); 1393 /* 1394 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1395 * See spc4r17 section 5.3 1396 */ 1397 cmd->sam_task_attr = TCM_HEAD_TAG; 1398 break; 1399 case TEST_UNIT_READY: 1400 cmd->execute_cmd = spc_emulate_testunitready; 1401 *size = 0; 1402 break; 1403 case MAINTENANCE_IN: 1404 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1405 /* 1406 * MAINTENANCE_IN from SCC-2 1407 * Check for emulated MI_REPORT_TARGET_PGS 1408 */ 1409 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1410 cmd->execute_cmd = 1411 target_emulate_report_target_port_groups; 1412 } 1413 *size = get_unaligned_be32(&cdb[6]); 1414 } else { 1415 /* 1416 * GPCMD_SEND_KEY from multi media commands 1417 */ 1418 *size = get_unaligned_be16(&cdb[8]); 1419 } 1420 break; 1421 case MAINTENANCE_OUT: 1422 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1423 /* 1424 * MAINTENANCE_OUT from SCC-2 1425 * Check for emulated MO_SET_TARGET_PGS. 1426 */ 1427 if (cdb[1] == MO_SET_TARGET_PGS) { 1428 cmd->execute_cmd = 1429 target_emulate_set_target_port_groups; 1430 } 1431 *size = get_unaligned_be32(&cdb[6]); 1432 } else { 1433 /* 1434 * GPCMD_SEND_KEY from multi media commands 1435 */ 1436 *size = get_unaligned_be16(&cdb[8]); 1437 } 1438 break; 1439 default: 1440 return TCM_UNSUPPORTED_SCSI_OPCODE; 1441 } 1442 1443 return 0; 1444 } 1445 EXPORT_SYMBOL(spc_parse_cdb); 1446