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 unsigned char *rbuf; 705 unsigned char *cdb = cmd->t_task_cdb; 706 unsigned char *buf; 707 sense_reason_t ret; 708 int p; 709 int len = 0; 710 711 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); 712 if (!buf) { 713 pr_err("Unable to allocate response buffer for INQUIRY\n"); 714 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 715 } 716 717 buf[0] = dev->transport->get_device_type(dev); 718 719 if (!(cdb[1] & 0x1)) { 720 if (cdb[2]) { 721 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", 722 cdb[2]); 723 ret = TCM_INVALID_CDB_FIELD; 724 goto out; 725 } 726 727 ret = spc_emulate_inquiry_std(cmd, buf); 728 len = buf[4] + 5; 729 goto out; 730 } 731 732 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { 733 if (cdb[2] == evpd_handlers[p].page) { 734 buf[1] = cdb[2]; 735 ret = evpd_handlers[p].emulate(cmd, buf); 736 len = get_unaligned_be16(&buf[2]) + 4; 737 goto out; 738 } 739 } 740 741 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); 742 ret = TCM_INVALID_CDB_FIELD; 743 744 out: 745 rbuf = transport_kmap_data_sg(cmd); 746 if (rbuf) { 747 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); 748 transport_kunmap_data_sg(cmd); 749 } 750 kfree(buf); 751 752 if (!ret) 753 target_complete_cmd_with_length(cmd, GOOD, len); 754 return ret; 755 } 756 757 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) 758 { 759 p[0] = 0x01; 760 p[1] = 0x0a; 761 762 /* No changeable values for now */ 763 if (pc == 1) 764 goto out; 765 766 out: 767 return 12; 768 } 769 770 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) 771 { 772 struct se_device *dev = cmd->se_dev; 773 struct se_session *sess = cmd->se_sess; 774 775 p[0] = 0x0a; 776 p[1] = 0x0a; 777 778 /* No changeable values for now */ 779 if (pc == 1) 780 goto out; 781 782 /* GLTSD: No implicit save of log parameters */ 783 p[2] = (1 << 1); 784 if (target_sense_desc_format(dev)) 785 /* D_SENSE: Descriptor format sense data for 64bit sectors */ 786 p[2] |= (1 << 2); 787 788 /* 789 * From spc4r23, 7.4.7 Control mode page 790 * 791 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies 792 * restrictions on the algorithm used for reordering commands 793 * having the SIMPLE task attribute (see SAM-4). 794 * 795 * Table 368 -- QUEUE ALGORITHM MODIFIER field 796 * Code Description 797 * 0h Restricted reordering 798 * 1h Unrestricted reordering allowed 799 * 2h to 7h Reserved 800 * 8h to Fh Vendor specific 801 * 802 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that 803 * the device server shall order the processing sequence of commands 804 * having the SIMPLE task attribute such that data integrity is maintained 805 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol 806 * requests is halted at any time, the final value of all data observable 807 * on the medium shall be the same as if all the commands had been processed 808 * with the ORDERED task attribute). 809 * 810 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the 811 * device server may reorder the processing sequence of commands having the 812 * SIMPLE task attribute in any manner. Any data integrity exposures related to 813 * command sequence order shall be explicitly handled by the application client 814 * through the selection of appropriate ommands and task attributes. 815 */ 816 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; 817 /* 818 * From spc4r17, section 7.4.6 Control mode Page 819 * 820 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 821 * 822 * 00b: The logical unit shall clear any unit attention condition 823 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 824 * status and shall not establish a unit attention condition when a com- 825 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 826 * status. 827 * 828 * 10b: The logical unit shall not clear any unit attention condition 829 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 830 * status and shall not establish a unit attention condition when 831 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 832 * CONFLICT status. 833 * 834 * 11b a The logical unit shall not clear any unit attention condition 835 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 836 * status and shall establish a unit attention condition for the 837 * initiator port associated with the I_T nexus on which the BUSY, 838 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 839 * Depending on the status, the additional sense code shall be set to 840 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 841 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 842 * command, a unit attention condition shall be established only once 843 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 844 * to the number of commands completed with one of those status codes. 845 */ 846 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) { 847 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA: 848 p[4] = 0x30; 849 break; 850 case TARGET_UA_INTLCK_CTRL_NO_CLEAR: 851 p[4] = 0x20; 852 break; 853 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */ 854 p[4] = 0x00; 855 break; 856 } 857 /* 858 * From spc4r17, section 7.4.6 Control mode Page 859 * 860 * Task Aborted Status (TAS) bit set to zero. 861 * 862 * A task aborted status (TAS) bit set to zero specifies that aborted 863 * tasks shall be terminated by the device server without any response 864 * to the application client. A TAS bit set to one specifies that tasks 865 * aborted by the actions of an I_T nexus other than the I_T nexus on 866 * which the command was received shall be completed with TASK ABORTED 867 * status (see SAM-4). 868 */ 869 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 870 /* 871 * From spc4r30, section 7.5.7 Control mode page 872 * 873 * Application Tag Owner (ATO) bit set to one. 874 * 875 * If the ATO bit is set to one the device server shall not modify the 876 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 877 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 878 * TAG field. 879 */ 880 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 881 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 882 p[5] |= 0x80; 883 } 884 885 p[8] = 0xff; 886 p[9] = 0xff; 887 p[11] = 30; 888 889 out: 890 return 12; 891 } 892 893 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 894 { 895 struct se_device *dev = cmd->se_dev; 896 897 p[0] = 0x08; 898 p[1] = 0x12; 899 900 /* No changeable values for now */ 901 if (pc == 1) 902 goto out; 903 904 if (target_check_wce(dev)) 905 p[2] = 0x04; /* Write Cache Enable */ 906 p[12] = 0x20; /* Disabled Read Ahead */ 907 908 out: 909 return 20; 910 } 911 912 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 913 { 914 p[0] = 0x1c; 915 p[1] = 0x0a; 916 917 /* No changeable values for now */ 918 if (pc == 1) 919 goto out; 920 921 out: 922 return 12; 923 } 924 925 static struct { 926 uint8_t page; 927 uint8_t subpage; 928 int (*emulate)(struct se_cmd *, u8, unsigned char *); 929 } modesense_handlers[] = { 930 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 931 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 932 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 933 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 934 }; 935 936 static void spc_modesense_write_protect(unsigned char *buf, int type) 937 { 938 /* 939 * I believe that the WP bit (bit 7) in the mode header is the same for 940 * all device types.. 941 */ 942 switch (type) { 943 case TYPE_DISK: 944 case TYPE_TAPE: 945 default: 946 buf[0] |= 0x80; /* WP bit */ 947 break; 948 } 949 } 950 951 static void spc_modesense_dpofua(unsigned char *buf, int type) 952 { 953 switch (type) { 954 case TYPE_DISK: 955 buf[0] |= 0x10; /* DPOFUA bit */ 956 break; 957 default: 958 break; 959 } 960 } 961 962 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 963 { 964 *buf++ = 8; 965 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 966 buf += 4; 967 put_unaligned_be32(block_size, buf); 968 return 9; 969 } 970 971 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 972 { 973 if (blocks <= 0xffffffff) 974 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 975 976 *buf++ = 1; /* LONGLBA */ 977 buf += 2; 978 *buf++ = 16; 979 put_unaligned_be64(blocks, buf); 980 buf += 12; 981 put_unaligned_be32(block_size, buf); 982 983 return 17; 984 } 985 986 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 987 { 988 struct se_device *dev = cmd->se_dev; 989 char *cdb = cmd->t_task_cdb; 990 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 991 int type = dev->transport->get_device_type(dev); 992 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 993 bool dbd = !!(cdb[1] & 0x08); 994 bool llba = ten ? !!(cdb[1] & 0x10) : false; 995 u8 pc = cdb[2] >> 6; 996 u8 page = cdb[2] & 0x3f; 997 u8 subpage = cdb[3]; 998 int length = 0; 999 int ret; 1000 int i; 1001 1002 memset(buf, 0, SE_MODE_PAGE_BUF); 1003 1004 /* 1005 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1006 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1007 */ 1008 length = ten ? 3 : 2; 1009 1010 /* DEVICE-SPECIFIC PARAMETER */ 1011 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1012 spc_modesense_write_protect(&buf[length], type); 1013 1014 /* 1015 * SBC only allows us to enable FUA and DPO together. Fortunately 1016 * DPO is explicitly specified as a hint, so a noop is a perfectly 1017 * valid implementation. 1018 */ 1019 if (target_check_fua(dev)) 1020 spc_modesense_dpofua(&buf[length], type); 1021 1022 ++length; 1023 1024 /* BLOCK DESCRIPTOR */ 1025 1026 /* 1027 * For now we only include a block descriptor for disk (SBC) 1028 * devices; other command sets use a slightly different format. 1029 */ 1030 if (!dbd && type == TYPE_DISK) { 1031 u64 blocks = dev->transport->get_blocks(dev); 1032 u32 block_size = dev->dev_attrib.block_size; 1033 1034 if (ten) { 1035 if (llba) { 1036 length += spc_modesense_long_blockdesc(&buf[length], 1037 blocks, block_size); 1038 } else { 1039 length += 3; 1040 length += spc_modesense_blockdesc(&buf[length], 1041 blocks, block_size); 1042 } 1043 } else { 1044 length += spc_modesense_blockdesc(&buf[length], blocks, 1045 block_size); 1046 } 1047 } else { 1048 if (ten) 1049 length += 4; 1050 else 1051 length += 1; 1052 } 1053 1054 if (page == 0x3f) { 1055 if (subpage != 0x00 && subpage != 0xff) { 1056 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1057 return TCM_INVALID_CDB_FIELD; 1058 } 1059 1060 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1061 /* 1062 * Tricky way to say all subpage 00h for 1063 * subpage==0, all subpages for subpage==0xff 1064 * (and we just checked above that those are 1065 * the only two possibilities). 1066 */ 1067 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1068 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1069 if (!ten && length + ret >= 255) 1070 break; 1071 length += ret; 1072 } 1073 } 1074 1075 goto set_length; 1076 } 1077 1078 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1079 if (modesense_handlers[i].page == page && 1080 modesense_handlers[i].subpage == subpage) { 1081 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1082 goto set_length; 1083 } 1084 1085 /* 1086 * We don't intend to implement: 1087 * - obsolete page 03h "format parameters" (checked by Solaris) 1088 */ 1089 if (page != 0x03) 1090 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1091 page, subpage); 1092 1093 return TCM_UNKNOWN_MODE_PAGE; 1094 1095 set_length: 1096 if (ten) 1097 put_unaligned_be16(length - 2, buf); 1098 else 1099 buf[0] = length - 1; 1100 1101 rbuf = transport_kmap_data_sg(cmd); 1102 if (rbuf) { 1103 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1104 transport_kunmap_data_sg(cmd); 1105 } 1106 1107 target_complete_cmd_with_length(cmd, GOOD, length); 1108 return 0; 1109 } 1110 1111 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1112 { 1113 char *cdb = cmd->t_task_cdb; 1114 bool ten = cdb[0] == MODE_SELECT_10; 1115 int off = ten ? 8 : 4; 1116 bool pf = !!(cdb[1] & 0x10); 1117 u8 page, subpage; 1118 unsigned char *buf; 1119 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1120 int length; 1121 sense_reason_t ret = 0; 1122 int i; 1123 1124 if (!cmd->data_length) { 1125 target_complete_cmd(cmd, GOOD); 1126 return 0; 1127 } 1128 1129 if (cmd->data_length < off + 2) 1130 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1131 1132 buf = transport_kmap_data_sg(cmd); 1133 if (!buf) 1134 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1135 1136 if (!pf) { 1137 ret = TCM_INVALID_CDB_FIELD; 1138 goto out; 1139 } 1140 1141 page = buf[off] & 0x3f; 1142 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1143 1144 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1145 if (modesense_handlers[i].page == page && 1146 modesense_handlers[i].subpage == subpage) { 1147 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1148 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1149 goto check_contents; 1150 } 1151 1152 ret = TCM_UNKNOWN_MODE_PAGE; 1153 goto out; 1154 1155 check_contents: 1156 if (cmd->data_length < off + length) { 1157 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1158 goto out; 1159 } 1160 1161 if (memcmp(buf + off, tbuf, length)) 1162 ret = TCM_INVALID_PARAMETER_LIST; 1163 1164 out: 1165 transport_kunmap_data_sg(cmd); 1166 1167 if (!ret) 1168 target_complete_cmd(cmd, GOOD); 1169 return ret; 1170 } 1171 1172 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1173 { 1174 unsigned char *cdb = cmd->t_task_cdb; 1175 unsigned char *rbuf; 1176 u8 ua_asc = 0, ua_ascq = 0; 1177 unsigned char buf[SE_SENSE_BUF]; 1178 bool desc_format = target_sense_desc_format(cmd->se_dev); 1179 1180 memset(buf, 0, SE_SENSE_BUF); 1181 1182 if (cdb[1] & 0x01) { 1183 pr_err("REQUEST_SENSE description emulation not" 1184 " supported\n"); 1185 return TCM_INVALID_CDB_FIELD; 1186 } 1187 1188 rbuf = transport_kmap_data_sg(cmd); 1189 if (!rbuf) 1190 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1191 1192 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1193 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1194 ua_asc, ua_ascq); 1195 else 1196 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1197 1198 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1199 transport_kunmap_data_sg(cmd); 1200 1201 target_complete_cmd(cmd, GOOD); 1202 return 0; 1203 } 1204 1205 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1206 { 1207 struct se_dev_entry *deve; 1208 struct se_session *sess = cmd->se_sess; 1209 struct se_node_acl *nacl; 1210 struct scsi_lun slun; 1211 unsigned char *buf; 1212 u32 lun_count = 0, offset = 8; 1213 __be32 len; 1214 1215 buf = transport_kmap_data_sg(cmd); 1216 if (cmd->data_length && !buf) 1217 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1218 1219 /* 1220 * If no struct se_session pointer is present, this struct se_cmd is 1221 * coming via a target_core_mod PASSTHROUGH op, and not through 1222 * a $FABRIC_MOD. In that case, report LUN=0 only. 1223 */ 1224 if (!sess) 1225 goto done; 1226 1227 nacl = sess->se_node_acl; 1228 1229 rcu_read_lock(); 1230 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1231 /* 1232 * We determine the correct LUN LIST LENGTH even once we 1233 * have reached the initial allocation length. 1234 * See SPC2-R20 7.19. 1235 */ 1236 lun_count++; 1237 if (offset >= cmd->data_length) 1238 continue; 1239 1240 int_to_scsilun(deve->mapped_lun, &slun); 1241 memcpy(buf + offset, &slun, 1242 min(8u, cmd->data_length - offset)); 1243 offset += 8; 1244 } 1245 rcu_read_unlock(); 1246 1247 /* 1248 * See SPC3 r07, page 159. 1249 */ 1250 done: 1251 /* 1252 * If no LUNs are accessible, report virtual LUN 0. 1253 */ 1254 if (lun_count == 0) { 1255 int_to_scsilun(0, &slun); 1256 if (cmd->data_length > 8) 1257 memcpy(buf + offset, &slun, 1258 min(8u, cmd->data_length - offset)); 1259 lun_count = 1; 1260 } 1261 1262 if (buf) { 1263 len = cpu_to_be32(lun_count * 8); 1264 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1265 transport_kunmap_data_sg(cmd); 1266 } 1267 1268 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); 1269 return 0; 1270 } 1271 EXPORT_SYMBOL(spc_emulate_report_luns); 1272 1273 static sense_reason_t 1274 spc_emulate_testunitready(struct se_cmd *cmd) 1275 { 1276 target_complete_cmd(cmd, GOOD); 1277 return 0; 1278 } 1279 1280 sense_reason_t 1281 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1282 { 1283 struct se_device *dev = cmd->se_dev; 1284 unsigned char *cdb = cmd->t_task_cdb; 1285 1286 if (!dev->dev_attrib.emulate_pr && 1287 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1288 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1289 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1290 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1291 return TCM_UNSUPPORTED_SCSI_OPCODE; 1292 } 1293 1294 switch (cdb[0]) { 1295 case MODE_SELECT: 1296 *size = cdb[4]; 1297 cmd->execute_cmd = spc_emulate_modeselect; 1298 break; 1299 case MODE_SELECT_10: 1300 *size = get_unaligned_be16(&cdb[7]); 1301 cmd->execute_cmd = spc_emulate_modeselect; 1302 break; 1303 case MODE_SENSE: 1304 *size = cdb[4]; 1305 cmd->execute_cmd = spc_emulate_modesense; 1306 break; 1307 case MODE_SENSE_10: 1308 *size = get_unaligned_be16(&cdb[7]); 1309 cmd->execute_cmd = spc_emulate_modesense; 1310 break; 1311 case LOG_SELECT: 1312 case LOG_SENSE: 1313 *size = get_unaligned_be16(&cdb[7]); 1314 break; 1315 case PERSISTENT_RESERVE_IN: 1316 *size = get_unaligned_be16(&cdb[7]); 1317 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1318 break; 1319 case PERSISTENT_RESERVE_OUT: 1320 *size = get_unaligned_be32(&cdb[5]); 1321 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1322 break; 1323 case RELEASE: 1324 case RELEASE_10: 1325 if (cdb[0] == RELEASE_10) 1326 *size = get_unaligned_be16(&cdb[7]); 1327 else 1328 *size = cmd->data_length; 1329 1330 cmd->execute_cmd = target_scsi2_reservation_release; 1331 break; 1332 case RESERVE: 1333 case RESERVE_10: 1334 /* 1335 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1336 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1337 */ 1338 if (cdb[0] == RESERVE_10) 1339 *size = get_unaligned_be16(&cdb[7]); 1340 else 1341 *size = cmd->data_length; 1342 1343 cmd->execute_cmd = target_scsi2_reservation_reserve; 1344 break; 1345 case REQUEST_SENSE: 1346 *size = cdb[4]; 1347 cmd->execute_cmd = spc_emulate_request_sense; 1348 break; 1349 case INQUIRY: 1350 *size = get_unaligned_be16(&cdb[3]); 1351 1352 /* 1353 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1354 * See spc4r17 section 5.3 1355 */ 1356 cmd->sam_task_attr = TCM_HEAD_TAG; 1357 cmd->execute_cmd = spc_emulate_inquiry; 1358 break; 1359 case SECURITY_PROTOCOL_IN: 1360 case SECURITY_PROTOCOL_OUT: 1361 *size = get_unaligned_be32(&cdb[6]); 1362 break; 1363 case EXTENDED_COPY: 1364 *size = get_unaligned_be32(&cdb[10]); 1365 cmd->execute_cmd = target_do_xcopy; 1366 break; 1367 case RECEIVE_COPY_RESULTS: 1368 *size = get_unaligned_be32(&cdb[10]); 1369 cmd->execute_cmd = target_do_receive_copy_results; 1370 break; 1371 case READ_ATTRIBUTE: 1372 case WRITE_ATTRIBUTE: 1373 *size = get_unaligned_be32(&cdb[10]); 1374 break; 1375 case RECEIVE_DIAGNOSTIC: 1376 case SEND_DIAGNOSTIC: 1377 *size = get_unaligned_be16(&cdb[3]); 1378 break; 1379 case WRITE_BUFFER: 1380 *size = get_unaligned_be24(&cdb[6]); 1381 break; 1382 case REPORT_LUNS: 1383 cmd->execute_cmd = spc_emulate_report_luns; 1384 *size = get_unaligned_be32(&cdb[6]); 1385 /* 1386 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1387 * See spc4r17 section 5.3 1388 */ 1389 cmd->sam_task_attr = TCM_HEAD_TAG; 1390 break; 1391 case TEST_UNIT_READY: 1392 cmd->execute_cmd = spc_emulate_testunitready; 1393 *size = 0; 1394 break; 1395 case MAINTENANCE_IN: 1396 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1397 /* 1398 * MAINTENANCE_IN from SCC-2 1399 * Check for emulated MI_REPORT_TARGET_PGS 1400 */ 1401 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1402 cmd->execute_cmd = 1403 target_emulate_report_target_port_groups; 1404 } 1405 *size = get_unaligned_be32(&cdb[6]); 1406 } else { 1407 /* 1408 * GPCMD_SEND_KEY from multi media commands 1409 */ 1410 *size = get_unaligned_be16(&cdb[8]); 1411 } 1412 break; 1413 case MAINTENANCE_OUT: 1414 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1415 /* 1416 * MAINTENANCE_OUT from SCC-2 1417 * Check for emulated MO_SET_TARGET_PGS. 1418 */ 1419 if (cdb[1] == MO_SET_TARGET_PGS) { 1420 cmd->execute_cmd = 1421 target_emulate_set_target_port_groups; 1422 } 1423 *size = get_unaligned_be32(&cdb[6]); 1424 } else { 1425 /* 1426 * GPCMD_SEND_KEY from multi media commands 1427 */ 1428 *size = get_unaligned_be16(&cdb[8]); 1429 } 1430 break; 1431 default: 1432 return TCM_UNSUPPORTED_SCSI_OPCODE; 1433 } 1434 1435 return 0; 1436 } 1437 EXPORT_SYMBOL(spc_parse_cdb); 1438