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 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) { 851 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA: 852 p[4] = 0x30; 853 break; 854 case TARGET_UA_INTLCK_CTRL_NO_CLEAR: 855 p[4] = 0x20; 856 break; 857 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */ 858 p[4] = 0x00; 859 break; 860 } 861 /* 862 * From spc4r17, section 7.4.6 Control mode Page 863 * 864 * Task Aborted Status (TAS) bit set to zero. 865 * 866 * A task aborted status (TAS) bit set to zero specifies that aborted 867 * tasks shall be terminated by the device server without any response 868 * to the application client. A TAS bit set to one specifies that tasks 869 * aborted by the actions of an I_T nexus other than the I_T nexus on 870 * which the command was received shall be completed with TASK ABORTED 871 * status (see SAM-4). 872 */ 873 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 874 /* 875 * From spc4r30, section 7.5.7 Control mode page 876 * 877 * Application Tag Owner (ATO) bit set to one. 878 * 879 * If the ATO bit is set to one the device server shall not modify the 880 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 881 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 882 * TAG field. 883 */ 884 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 885 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 886 p[5] |= 0x80; 887 } 888 889 p[8] = 0xff; 890 p[9] = 0xff; 891 p[11] = 30; 892 893 out: 894 return 12; 895 } 896 897 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 898 { 899 struct se_device *dev = cmd->se_dev; 900 901 p[0] = 0x08; 902 p[1] = 0x12; 903 904 /* No changeable values for now */ 905 if (pc == 1) 906 goto out; 907 908 if (target_check_wce(dev)) 909 p[2] = 0x04; /* Write Cache Enable */ 910 p[12] = 0x20; /* Disabled Read Ahead */ 911 912 out: 913 return 20; 914 } 915 916 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 917 { 918 p[0] = 0x1c; 919 p[1] = 0x0a; 920 921 /* No changeable values for now */ 922 if (pc == 1) 923 goto out; 924 925 out: 926 return 12; 927 } 928 929 static struct { 930 uint8_t page; 931 uint8_t subpage; 932 int (*emulate)(struct se_cmd *, u8, unsigned char *); 933 } modesense_handlers[] = { 934 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 935 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 936 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 937 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 938 }; 939 940 static void spc_modesense_write_protect(unsigned char *buf, int type) 941 { 942 /* 943 * I believe that the WP bit (bit 7) in the mode header is the same for 944 * all device types.. 945 */ 946 switch (type) { 947 case TYPE_DISK: 948 case TYPE_TAPE: 949 default: 950 buf[0] |= 0x80; /* WP bit */ 951 break; 952 } 953 } 954 955 static void spc_modesense_dpofua(unsigned char *buf, int type) 956 { 957 switch (type) { 958 case TYPE_DISK: 959 buf[0] |= 0x10; /* DPOFUA bit */ 960 break; 961 default: 962 break; 963 } 964 } 965 966 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 967 { 968 *buf++ = 8; 969 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 970 buf += 4; 971 put_unaligned_be32(block_size, buf); 972 return 9; 973 } 974 975 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 976 { 977 if (blocks <= 0xffffffff) 978 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 979 980 *buf++ = 1; /* LONGLBA */ 981 buf += 2; 982 *buf++ = 16; 983 put_unaligned_be64(blocks, buf); 984 buf += 12; 985 put_unaligned_be32(block_size, buf); 986 987 return 17; 988 } 989 990 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 991 { 992 struct se_device *dev = cmd->se_dev; 993 char *cdb = cmd->t_task_cdb; 994 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 995 int type = dev->transport->get_device_type(dev); 996 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 997 bool dbd = !!(cdb[1] & 0x08); 998 bool llba = ten ? !!(cdb[1] & 0x10) : false; 999 u8 pc = cdb[2] >> 6; 1000 u8 page = cdb[2] & 0x3f; 1001 u8 subpage = cdb[3]; 1002 int length = 0; 1003 int ret; 1004 int i; 1005 1006 memset(buf, 0, SE_MODE_PAGE_BUF); 1007 1008 /* 1009 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1010 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1011 */ 1012 length = ten ? 3 : 2; 1013 1014 /* DEVICE-SPECIFIC PARAMETER */ 1015 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1016 spc_modesense_write_protect(&buf[length], type); 1017 1018 /* 1019 * SBC only allows us to enable FUA and DPO together. Fortunately 1020 * DPO is explicitly specified as a hint, so a noop is a perfectly 1021 * valid implementation. 1022 */ 1023 if (target_check_fua(dev)) 1024 spc_modesense_dpofua(&buf[length], type); 1025 1026 ++length; 1027 1028 /* BLOCK DESCRIPTOR */ 1029 1030 /* 1031 * For now we only include a block descriptor for disk (SBC) 1032 * devices; other command sets use a slightly different format. 1033 */ 1034 if (!dbd && type == TYPE_DISK) { 1035 u64 blocks = dev->transport->get_blocks(dev); 1036 u32 block_size = dev->dev_attrib.block_size; 1037 1038 if (ten) { 1039 if (llba) { 1040 length += spc_modesense_long_blockdesc(&buf[length], 1041 blocks, block_size); 1042 } else { 1043 length += 3; 1044 length += spc_modesense_blockdesc(&buf[length], 1045 blocks, block_size); 1046 } 1047 } else { 1048 length += spc_modesense_blockdesc(&buf[length], blocks, 1049 block_size); 1050 } 1051 } else { 1052 if (ten) 1053 length += 4; 1054 else 1055 length += 1; 1056 } 1057 1058 if (page == 0x3f) { 1059 if (subpage != 0x00 && subpage != 0xff) { 1060 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1061 return TCM_INVALID_CDB_FIELD; 1062 } 1063 1064 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1065 /* 1066 * Tricky way to say all subpage 00h for 1067 * subpage==0, all subpages for subpage==0xff 1068 * (and we just checked above that those are 1069 * the only two possibilities). 1070 */ 1071 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1072 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1073 if (!ten && length + ret >= 255) 1074 break; 1075 length += ret; 1076 } 1077 } 1078 1079 goto set_length; 1080 } 1081 1082 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1083 if (modesense_handlers[i].page == page && 1084 modesense_handlers[i].subpage == subpage) { 1085 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1086 goto set_length; 1087 } 1088 1089 /* 1090 * We don't intend to implement: 1091 * - obsolete page 03h "format parameters" (checked by Solaris) 1092 */ 1093 if (page != 0x03) 1094 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1095 page, subpage); 1096 1097 return TCM_UNKNOWN_MODE_PAGE; 1098 1099 set_length: 1100 if (ten) 1101 put_unaligned_be16(length - 2, buf); 1102 else 1103 buf[0] = length - 1; 1104 1105 rbuf = transport_kmap_data_sg(cmd); 1106 if (rbuf) { 1107 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1108 transport_kunmap_data_sg(cmd); 1109 } 1110 1111 target_complete_cmd_with_length(cmd, GOOD, length); 1112 return 0; 1113 } 1114 1115 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1116 { 1117 char *cdb = cmd->t_task_cdb; 1118 bool ten = cdb[0] == MODE_SELECT_10; 1119 int off = ten ? 8 : 4; 1120 bool pf = !!(cdb[1] & 0x10); 1121 u8 page, subpage; 1122 unsigned char *buf; 1123 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1124 int length; 1125 sense_reason_t ret = 0; 1126 int i; 1127 1128 if (!cmd->data_length) { 1129 target_complete_cmd(cmd, GOOD); 1130 return 0; 1131 } 1132 1133 if (cmd->data_length < off + 2) 1134 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1135 1136 buf = transport_kmap_data_sg(cmd); 1137 if (!buf) 1138 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1139 1140 if (!pf) { 1141 ret = TCM_INVALID_CDB_FIELD; 1142 goto out; 1143 } 1144 1145 page = buf[off] & 0x3f; 1146 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1147 1148 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1149 if (modesense_handlers[i].page == page && 1150 modesense_handlers[i].subpage == subpage) { 1151 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1152 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1153 goto check_contents; 1154 } 1155 1156 ret = TCM_UNKNOWN_MODE_PAGE; 1157 goto out; 1158 1159 check_contents: 1160 if (cmd->data_length < off + length) { 1161 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1162 goto out; 1163 } 1164 1165 if (memcmp(buf + off, tbuf, length)) 1166 ret = TCM_INVALID_PARAMETER_LIST; 1167 1168 out: 1169 transport_kunmap_data_sg(cmd); 1170 1171 if (!ret) 1172 target_complete_cmd(cmd, GOOD); 1173 return ret; 1174 } 1175 1176 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1177 { 1178 unsigned char *cdb = cmd->t_task_cdb; 1179 unsigned char *rbuf; 1180 u8 ua_asc = 0, ua_ascq = 0; 1181 unsigned char buf[SE_SENSE_BUF]; 1182 bool desc_format = target_sense_desc_format(cmd->se_dev); 1183 1184 memset(buf, 0, SE_SENSE_BUF); 1185 1186 if (cdb[1] & 0x01) { 1187 pr_err("REQUEST_SENSE description emulation not" 1188 " supported\n"); 1189 return TCM_INVALID_CDB_FIELD; 1190 } 1191 1192 rbuf = transport_kmap_data_sg(cmd); 1193 if (!rbuf) 1194 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1195 1196 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1197 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1198 ua_asc, ua_ascq); 1199 else 1200 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1201 1202 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1203 transport_kunmap_data_sg(cmd); 1204 1205 target_complete_cmd(cmd, GOOD); 1206 return 0; 1207 } 1208 1209 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1210 { 1211 struct se_dev_entry *deve; 1212 struct se_session *sess = cmd->se_sess; 1213 struct se_node_acl *nacl; 1214 struct scsi_lun slun; 1215 unsigned char *buf; 1216 u32 lun_count = 0, offset = 8; 1217 __be32 len; 1218 1219 buf = transport_kmap_data_sg(cmd); 1220 if (cmd->data_length && !buf) 1221 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1222 1223 /* 1224 * If no struct se_session pointer is present, this struct se_cmd is 1225 * coming via a target_core_mod PASSTHROUGH op, and not through 1226 * a $FABRIC_MOD. In that case, report LUN=0 only. 1227 */ 1228 if (!sess) 1229 goto done; 1230 1231 nacl = sess->se_node_acl; 1232 1233 rcu_read_lock(); 1234 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1235 /* 1236 * We determine the correct LUN LIST LENGTH even once we 1237 * have reached the initial allocation length. 1238 * See SPC2-R20 7.19. 1239 */ 1240 lun_count++; 1241 if (offset >= cmd->data_length) 1242 continue; 1243 1244 int_to_scsilun(deve->mapped_lun, &slun); 1245 memcpy(buf + offset, &slun, 1246 min(8u, cmd->data_length - offset)); 1247 offset += 8; 1248 } 1249 rcu_read_unlock(); 1250 1251 /* 1252 * See SPC3 r07, page 159. 1253 */ 1254 done: 1255 /* 1256 * If no LUNs are accessible, report virtual LUN 0. 1257 */ 1258 if (lun_count == 0) { 1259 int_to_scsilun(0, &slun); 1260 if (cmd->data_length > 8) 1261 memcpy(buf + offset, &slun, 1262 min(8u, cmd->data_length - offset)); 1263 lun_count = 1; 1264 } 1265 1266 if (buf) { 1267 len = cpu_to_be32(lun_count * 8); 1268 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1269 transport_kunmap_data_sg(cmd); 1270 } 1271 1272 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); 1273 return 0; 1274 } 1275 EXPORT_SYMBOL(spc_emulate_report_luns); 1276 1277 static sense_reason_t 1278 spc_emulate_testunitready(struct se_cmd *cmd) 1279 { 1280 target_complete_cmd(cmd, GOOD); 1281 return 0; 1282 } 1283 1284 sense_reason_t 1285 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1286 { 1287 struct se_device *dev = cmd->se_dev; 1288 unsigned char *cdb = cmd->t_task_cdb; 1289 1290 if (!dev->dev_attrib.emulate_pr && 1291 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1292 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1293 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1294 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1295 return TCM_UNSUPPORTED_SCSI_OPCODE; 1296 } 1297 1298 switch (cdb[0]) { 1299 case MODE_SELECT: 1300 *size = cdb[4]; 1301 cmd->execute_cmd = spc_emulate_modeselect; 1302 break; 1303 case MODE_SELECT_10: 1304 *size = get_unaligned_be16(&cdb[7]); 1305 cmd->execute_cmd = spc_emulate_modeselect; 1306 break; 1307 case MODE_SENSE: 1308 *size = cdb[4]; 1309 cmd->execute_cmd = spc_emulate_modesense; 1310 break; 1311 case MODE_SENSE_10: 1312 *size = get_unaligned_be16(&cdb[7]); 1313 cmd->execute_cmd = spc_emulate_modesense; 1314 break; 1315 case LOG_SELECT: 1316 case LOG_SENSE: 1317 *size = get_unaligned_be16(&cdb[7]); 1318 break; 1319 case PERSISTENT_RESERVE_IN: 1320 *size = get_unaligned_be16(&cdb[7]); 1321 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1322 break; 1323 case PERSISTENT_RESERVE_OUT: 1324 *size = get_unaligned_be32(&cdb[5]); 1325 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1326 break; 1327 case RELEASE: 1328 case RELEASE_10: 1329 if (cdb[0] == RELEASE_10) 1330 *size = get_unaligned_be16(&cdb[7]); 1331 else 1332 *size = cmd->data_length; 1333 1334 cmd->execute_cmd = target_scsi2_reservation_release; 1335 break; 1336 case RESERVE: 1337 case RESERVE_10: 1338 /* 1339 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1340 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1341 */ 1342 if (cdb[0] == RESERVE_10) 1343 *size = get_unaligned_be16(&cdb[7]); 1344 else 1345 *size = cmd->data_length; 1346 1347 cmd->execute_cmd = target_scsi2_reservation_reserve; 1348 break; 1349 case REQUEST_SENSE: 1350 *size = cdb[4]; 1351 cmd->execute_cmd = spc_emulate_request_sense; 1352 break; 1353 case INQUIRY: 1354 *size = get_unaligned_be16(&cdb[3]); 1355 1356 /* 1357 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1358 * See spc4r17 section 5.3 1359 */ 1360 cmd->sam_task_attr = TCM_HEAD_TAG; 1361 cmd->execute_cmd = spc_emulate_inquiry; 1362 break; 1363 case SECURITY_PROTOCOL_IN: 1364 case SECURITY_PROTOCOL_OUT: 1365 *size = get_unaligned_be32(&cdb[6]); 1366 break; 1367 case EXTENDED_COPY: 1368 *size = get_unaligned_be32(&cdb[10]); 1369 cmd->execute_cmd = target_do_xcopy; 1370 break; 1371 case RECEIVE_COPY_RESULTS: 1372 *size = get_unaligned_be32(&cdb[10]); 1373 cmd->execute_cmd = target_do_receive_copy_results; 1374 break; 1375 case READ_ATTRIBUTE: 1376 case WRITE_ATTRIBUTE: 1377 *size = get_unaligned_be32(&cdb[10]); 1378 break; 1379 case RECEIVE_DIAGNOSTIC: 1380 case SEND_DIAGNOSTIC: 1381 *size = get_unaligned_be16(&cdb[3]); 1382 break; 1383 case WRITE_BUFFER: 1384 *size = get_unaligned_be24(&cdb[6]); 1385 break; 1386 case REPORT_LUNS: 1387 cmd->execute_cmd = spc_emulate_report_luns; 1388 *size = get_unaligned_be32(&cdb[6]); 1389 /* 1390 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1391 * See spc4r17 section 5.3 1392 */ 1393 cmd->sam_task_attr = TCM_HEAD_TAG; 1394 break; 1395 case TEST_UNIT_READY: 1396 cmd->execute_cmd = spc_emulate_testunitready; 1397 *size = 0; 1398 break; 1399 case MAINTENANCE_IN: 1400 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1401 /* 1402 * MAINTENANCE_IN from SCC-2 1403 * Check for emulated MI_REPORT_TARGET_PGS 1404 */ 1405 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1406 cmd->execute_cmd = 1407 target_emulate_report_target_port_groups; 1408 } 1409 *size = get_unaligned_be32(&cdb[6]); 1410 } else { 1411 /* 1412 * GPCMD_SEND_KEY from multi media commands 1413 */ 1414 *size = get_unaligned_be16(&cdb[8]); 1415 } 1416 break; 1417 case MAINTENANCE_OUT: 1418 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1419 /* 1420 * MAINTENANCE_OUT from SCC-2 1421 * Check for emulated MO_SET_TARGET_PGS. 1422 */ 1423 if (cdb[1] == MO_SET_TARGET_PGS) { 1424 cmd->execute_cmd = 1425 target_emulate_set_target_port_groups; 1426 } 1427 *size = get_unaligned_be32(&cdb[6]); 1428 } else { 1429 /* 1430 * GPCMD_SEND_KEY from multi media commands 1431 */ 1432 *size = get_unaligned_be16(&cdb[8]); 1433 } 1434 break; 1435 default: 1436 return TCM_UNSUPPORTED_SCSI_OPCODE; 1437 } 1438 1439 return 0; 1440 } 1441 EXPORT_SYMBOL(spc_parse_cdb); 1442