1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SCSI Primary Commands (SPC) parsing and emulation. 4 * 5 * (c) Copyright 2002-2013 Datera, Inc. 6 * 7 * Nicholas A. Bellinger <nab@kernel.org> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <asm/unaligned.h> 13 14 #include <scsi/scsi_proto.h> 15 #include <scsi/scsi_common.h> 16 #include <scsi/scsi_tcq.h> 17 18 #include <target/target_core_base.h> 19 #include <target/target_core_backend.h> 20 #include <target/target_core_fabric.h> 21 22 #include "target_core_internal.h" 23 #include "target_core_alua.h" 24 #include "target_core_pr.h" 25 #include "target_core_ua.h" 26 #include "target_core_xcopy.h" 27 28 static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf) 29 { 30 struct t10_alua_tg_pt_gp *tg_pt_gp; 31 32 /* 33 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. 34 */ 35 buf[5] = 0x80; 36 37 /* 38 * Set TPGS field for explicit and/or implicit ALUA access type 39 * and opteration. 40 * 41 * See spc4r17 section 6.4.2 Table 135 42 */ 43 spin_lock(&lun->lun_tg_pt_gp_lock); 44 tg_pt_gp = lun->lun_tg_pt_gp; 45 if (tg_pt_gp) 46 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; 47 spin_unlock(&lun->lun_tg_pt_gp_lock); 48 } 49 50 sense_reason_t 51 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) 52 { 53 struct se_lun *lun = cmd->se_lun; 54 struct se_device *dev = cmd->se_dev; 55 struct se_session *sess = cmd->se_sess; 56 57 /* Set RMB (removable media) for tape devices */ 58 if (dev->transport->get_device_type(dev) == TYPE_TAPE) 59 buf[1] = 0x80; 60 61 buf[2] = 0x05; /* SPC-3 */ 62 63 /* 64 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 65 * 66 * SPC4 says: 67 * A RESPONSE DATA FORMAT field set to 2h indicates that the 68 * standard INQUIRY data is in the format defined in this 69 * standard. Response data format values less than 2h are 70 * obsolete. Response data format values greater than 2h are 71 * reserved. 72 */ 73 buf[3] = 2; 74 75 /* 76 * Enable SCCS and TPGS fields for Emulated ALUA 77 */ 78 spc_fill_alua_data(lun, buf); 79 80 /* 81 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY 82 */ 83 if (dev->dev_attrib.emulate_3pc) 84 buf[5] |= 0x8; 85 /* 86 * Set Protection (PROTECT) bit when DIF has been enabled on the 87 * device, and the fabric supports VERIFY + PASS. Also report 88 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI 89 * to unprotected devices. 90 */ 91 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 92 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) 93 buf[5] |= 0x1; 94 } 95 96 buf[7] = 0x2; /* CmdQue=1 */ 97 98 /* 99 * ASCII data fields described as being left-aligned shall have any 100 * unused bytes at the end of the field (i.e., highest offset) and the 101 * unused bytes shall be filled with ASCII space characters (20h). 102 */ 103 memset(&buf[8], 0x20, 104 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN); 105 memcpy(&buf[8], dev->t10_wwn.vendor, 106 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 107 memcpy(&buf[16], dev->t10_wwn.model, 108 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN)); 109 memcpy(&buf[32], dev->t10_wwn.revision, 110 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN)); 111 buf[4] = 31; /* Set additional length to 31 */ 112 113 return 0; 114 } 115 EXPORT_SYMBOL(spc_emulate_inquiry_std); 116 117 /* unit serial number */ 118 static sense_reason_t 119 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) 120 { 121 struct se_device *dev = cmd->se_dev; 122 u16 len; 123 124 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 125 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); 126 len++; /* Extra Byte for NULL Terminator */ 127 buf[3] = len; 128 } 129 return 0; 130 } 131 132 void spc_parse_naa_6h_vendor_specific(struct se_device *dev, 133 unsigned char *buf) 134 { 135 unsigned char *p = &dev->t10_wwn.unit_serial[0]; 136 int cnt; 137 bool next = true; 138 139 /* 140 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on 141 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field 142 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION 143 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL 144 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure 145 * per device uniqeness. 146 */ 147 for (cnt = 0; *p && cnt < 13; p++) { 148 int val = hex_to_bin(*p); 149 150 if (val < 0) 151 continue; 152 153 if (next) { 154 next = false; 155 buf[cnt++] |= val; 156 } else { 157 next = true; 158 buf[cnt] = val << 4; 159 } 160 } 161 } 162 163 /* 164 * Device identification VPD, for a complete list of 165 * DESIGNATOR TYPEs see spc4r17 Table 459. 166 */ 167 sense_reason_t 168 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) 169 { 170 struct se_device *dev = cmd->se_dev; 171 struct se_lun *lun = cmd->se_lun; 172 struct se_portal_group *tpg = NULL; 173 struct t10_alua_lu_gp_member *lu_gp_mem; 174 struct t10_alua_tg_pt_gp *tg_pt_gp; 175 unsigned char *prod = &dev->t10_wwn.model[0]; 176 u32 prod_len; 177 u32 unit_serial_len, off = 0; 178 u16 len = 0, id_len; 179 180 off = 4; 181 182 /* 183 * NAA IEEE Registered Extended Assigned designator format, see 184 * spc4r17 section 7.7.3.6.5 185 * 186 * We depend upon a target_core_mod/ConfigFS provided 187 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial 188 * value in order to return the NAA id. 189 */ 190 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)) 191 goto check_t10_vend_desc; 192 193 /* CODE SET == Binary */ 194 buf[off++] = 0x1; 195 196 /* Set ASSOCIATION == addressed logical unit: 0)b */ 197 buf[off] = 0x00; 198 199 /* Identifier/Designator type == NAA identifier */ 200 buf[off++] |= 0x3; 201 off++; 202 203 /* Identifier/Designator length */ 204 buf[off++] = 0x10; 205 206 /* 207 * Start NAA IEEE Registered Extended Identifier/Designator 208 */ 209 buf[off++] = (0x6 << 4); 210 211 /* 212 * Use OpenFabrics IEEE Company ID: 00 14 05 213 */ 214 buf[off++] = 0x01; 215 buf[off++] = 0x40; 216 buf[off] = (0x5 << 4); 217 218 /* 219 * Return ConfigFS Unit Serial Number information for 220 * VENDOR_SPECIFIC_IDENTIFIER and 221 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION 222 */ 223 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 224 225 len = 20; 226 off = (len + 4); 227 228 check_t10_vend_desc: 229 /* 230 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 231 */ 232 id_len = 8; /* For Vendor field */ 233 prod_len = 4; /* For VPD Header */ 234 prod_len += 8; /* For Vendor field */ 235 prod_len += strlen(prod); 236 prod_len++; /* For : */ 237 238 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 239 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); 240 unit_serial_len++; /* For NULL Terminator */ 241 242 id_len += sprintf(&buf[off+12], "%s:%s", prod, 243 &dev->t10_wwn.unit_serial[0]); 244 } 245 buf[off] = 0x2; /* ASCII */ 246 buf[off+1] = 0x1; /* T10 Vendor ID */ 247 buf[off+2] = 0x0; 248 /* left align Vendor ID and pad with spaces */ 249 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN); 250 memcpy(&buf[off+4], dev->t10_wwn.vendor, 251 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 252 /* Extra Byte for NULL Terminator */ 253 id_len++; 254 /* Identifier Length */ 255 buf[off+3] = id_len; 256 /* Header size for Designation descriptor */ 257 len += (id_len + 4); 258 off += (id_len + 4); 259 260 if (1) { 261 struct t10_alua_lu_gp *lu_gp; 262 u32 padding, scsi_name_len, scsi_target_len; 263 u16 lu_gp_id = 0; 264 u16 tg_pt_gp_id = 0; 265 u16 tpgt; 266 267 tpg = lun->lun_tpg; 268 /* 269 * Relative target port identifer, see spc4r17 270 * section 7.7.3.7 271 * 272 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 273 * section 7.5.1 Table 362 274 */ 275 buf[off] = tpg->proto_id << 4; 276 buf[off++] |= 0x1; /* CODE SET == Binary */ 277 buf[off] = 0x80; /* Set PIV=1 */ 278 /* Set ASSOCIATION == target port: 01b */ 279 buf[off] |= 0x10; 280 /* DESIGNATOR TYPE == Relative target port identifer */ 281 buf[off++] |= 0x4; 282 off++; /* Skip over Reserved */ 283 buf[off++] = 4; /* DESIGNATOR LENGTH */ 284 /* Skip over Obsolete field in RTPI payload 285 * in Table 472 */ 286 off += 2; 287 put_unaligned_be16(lun->lun_rtpi, &buf[off]); 288 off += 2; 289 len += 8; /* Header size + Designation descriptor */ 290 /* 291 * Target port group identifier, see spc4r17 292 * section 7.7.3.8 293 * 294 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 295 * section 7.5.1 Table 362 296 */ 297 spin_lock(&lun->lun_tg_pt_gp_lock); 298 tg_pt_gp = lun->lun_tg_pt_gp; 299 if (!tg_pt_gp) { 300 spin_unlock(&lun->lun_tg_pt_gp_lock); 301 goto check_lu_gp; 302 } 303 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 304 spin_unlock(&lun->lun_tg_pt_gp_lock); 305 306 buf[off] = tpg->proto_id << 4; 307 buf[off++] |= 0x1; /* CODE SET == Binary */ 308 buf[off] = 0x80; /* Set PIV=1 */ 309 /* Set ASSOCIATION == target port: 01b */ 310 buf[off] |= 0x10; 311 /* DESIGNATOR TYPE == Target port group identifier */ 312 buf[off++] |= 0x5; 313 off++; /* Skip over Reserved */ 314 buf[off++] = 4; /* DESIGNATOR LENGTH */ 315 off += 2; /* Skip over Reserved Field */ 316 put_unaligned_be16(tg_pt_gp_id, &buf[off]); 317 off += 2; 318 len += 8; /* Header size + Designation descriptor */ 319 /* 320 * Logical Unit Group identifier, see spc4r17 321 * section 7.7.3.8 322 */ 323 check_lu_gp: 324 lu_gp_mem = dev->dev_alua_lu_gp_mem; 325 if (!lu_gp_mem) 326 goto check_scsi_name; 327 328 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 329 lu_gp = lu_gp_mem->lu_gp; 330 if (!lu_gp) { 331 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 332 goto check_scsi_name; 333 } 334 lu_gp_id = lu_gp->lu_gp_id; 335 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 336 337 buf[off++] |= 0x1; /* CODE SET == Binary */ 338 /* DESIGNATOR TYPE == Logical Unit Group identifier */ 339 buf[off++] |= 0x6; 340 off++; /* Skip over Reserved */ 341 buf[off++] = 4; /* DESIGNATOR LENGTH */ 342 off += 2; /* Skip over Reserved Field */ 343 put_unaligned_be16(lu_gp_id, &buf[off]); 344 off += 2; 345 len += 8; /* Header size + Designation descriptor */ 346 /* 347 * SCSI name string designator, see spc4r17 348 * section 7.7.3.11 349 * 350 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 351 * section 7.5.1 Table 362 352 */ 353 check_scsi_name: 354 buf[off] = tpg->proto_id << 4; 355 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 356 buf[off] = 0x80; /* Set PIV=1 */ 357 /* Set ASSOCIATION == target port: 01b */ 358 buf[off] |= 0x10; 359 /* DESIGNATOR TYPE == SCSI name string */ 360 buf[off++] |= 0x8; 361 off += 2; /* Skip over Reserved and length */ 362 /* 363 * SCSI name string identifer containing, $FABRIC_MOD 364 * dependent information. For LIO-Target and iSCSI 365 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in 366 * UTF-8 encoding. 367 */ 368 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 369 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", 370 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); 371 scsi_name_len += 1 /* Include NULL terminator */; 372 /* 373 * The null-terminated, null-padded (see 4.4.2) SCSI 374 * NAME STRING field contains a UTF-8 format string. 375 * The number of bytes in the SCSI NAME STRING field 376 * (i.e., the value in the DESIGNATOR LENGTH field) 377 * shall be no larger than 256 and shall be a multiple 378 * of four. 379 */ 380 padding = ((-scsi_name_len) & 3); 381 if (padding) 382 scsi_name_len += padding; 383 if (scsi_name_len > 256) 384 scsi_name_len = 256; 385 386 buf[off-1] = scsi_name_len; 387 off += scsi_name_len; 388 /* Header size + Designation descriptor */ 389 len += (scsi_name_len + 4); 390 391 /* 392 * Target device designator 393 */ 394 buf[off] = tpg->proto_id << 4; 395 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 396 buf[off] = 0x80; /* Set PIV=1 */ 397 /* Set ASSOCIATION == target device: 10b */ 398 buf[off] |= 0x20; 399 /* DESIGNATOR TYPE == SCSI name string */ 400 buf[off++] |= 0x8; 401 off += 2; /* Skip over Reserved and length */ 402 /* 403 * SCSI name string identifer containing, $FABRIC_MOD 404 * dependent information. For LIO-Target and iSCSI 405 * Target Port, this means "<iSCSI name>" in 406 * UTF-8 encoding. 407 */ 408 scsi_target_len = sprintf(&buf[off], "%s", 409 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 410 scsi_target_len += 1 /* Include NULL terminator */; 411 /* 412 * The null-terminated, null-padded (see 4.4.2) SCSI 413 * NAME STRING field contains a UTF-8 format string. 414 * The number of bytes in the SCSI NAME STRING field 415 * (i.e., the value in the DESIGNATOR LENGTH field) 416 * shall be no larger than 256 and shall be a multiple 417 * of four. 418 */ 419 padding = ((-scsi_target_len) & 3); 420 if (padding) 421 scsi_target_len += padding; 422 if (scsi_target_len > 256) 423 scsi_target_len = 256; 424 425 buf[off-1] = scsi_target_len; 426 off += scsi_target_len; 427 428 /* Header size + Designation descriptor */ 429 len += (scsi_target_len + 4); 430 } 431 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */ 432 return 0; 433 } 434 EXPORT_SYMBOL(spc_emulate_evpd_83); 435 436 /* Extended INQUIRY Data VPD Page */ 437 static sense_reason_t 438 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) 439 { 440 struct se_device *dev = cmd->se_dev; 441 struct se_session *sess = cmd->se_sess; 442 443 buf[3] = 0x3c; 444 /* 445 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK 446 * only for TYPE3 protection. 447 */ 448 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 449 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || 450 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) 451 buf[4] = 0x5; 452 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || 453 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) 454 buf[4] = 0x4; 455 } 456 457 /* logical unit supports type 1 and type 3 protection */ 458 if ((dev->transport->get_device_type(dev) == TYPE_DISK) && 459 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) && 460 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) { 461 buf[4] |= (0x3 << 3); 462 } 463 464 /* Set HEADSUP, ORDSUP, SIMPSUP */ 465 buf[5] = 0x07; 466 467 /* If WriteCache emulation is enabled, set V_SUP */ 468 if (target_check_wce(dev)) 469 buf[6] = 0x01; 470 /* If an LBA map is present set R_SUP */ 471 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); 472 if (!list_empty(&dev->t10_alua.lba_map_list)) 473 buf[8] = 0x10; 474 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); 475 return 0; 476 } 477 478 /* Block Limits VPD page */ 479 static sense_reason_t 480 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) 481 { 482 struct se_device *dev = cmd->se_dev; 483 u32 mtl = 0; 484 int have_tp = 0, opt, min; 485 486 /* 487 * Following spc3r22 section 6.5.3 Block Limits VPD page, when 488 * emulate_tpu=1 or emulate_tpws=1 we will be expect a 489 * different page length for Thin Provisioning. 490 */ 491 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 492 have_tp = 1; 493 494 buf[0] = dev->transport->get_device_type(dev); 495 buf[3] = have_tp ? 0x3c : 0x10; 496 497 /* Set WSNZ to 1 */ 498 buf[4] = 0x01; 499 /* 500 * Set MAXIMUM COMPARE AND WRITE LENGTH 501 */ 502 if (dev->dev_attrib.emulate_caw) 503 buf[5] = 0x01; 504 505 /* 506 * Set OPTIMAL TRANSFER LENGTH GRANULARITY 507 */ 508 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) 509 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); 510 else 511 put_unaligned_be16(1, &buf[6]); 512 513 /* 514 * Set MAXIMUM TRANSFER LENGTH 515 * 516 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics 517 * enforcing maximum HW scatter-gather-list entry limit 518 */ 519 if (cmd->se_tfo->max_data_sg_nents) { 520 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) / 521 dev->dev_attrib.block_size; 522 } 523 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]); 524 525 /* 526 * Set OPTIMAL TRANSFER LENGTH 527 */ 528 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) 529 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); 530 else 531 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); 532 533 /* 534 * Exit now if we don't support TP. 535 */ 536 if (!have_tp) 537 goto max_write_same; 538 539 /* 540 * Set MAXIMUM UNMAP LBA COUNT 541 */ 542 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); 543 544 /* 545 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT 546 */ 547 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, 548 &buf[24]); 549 550 /* 551 * Set OPTIMAL UNMAP GRANULARITY 552 */ 553 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); 554 555 /* 556 * UNMAP GRANULARITY ALIGNMENT 557 */ 558 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, 559 &buf[32]); 560 if (dev->dev_attrib.unmap_granularity_alignment != 0) 561 buf[32] |= 0x80; /* Set the UGAVALID bit */ 562 563 /* 564 * MAXIMUM WRITE SAME LENGTH 565 */ 566 max_write_same: 567 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); 568 569 return 0; 570 } 571 572 /* Block Device Characteristics VPD page */ 573 static sense_reason_t 574 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) 575 { 576 struct se_device *dev = cmd->se_dev; 577 578 buf[0] = dev->transport->get_device_type(dev); 579 buf[3] = 0x3c; 580 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0; 581 582 return 0; 583 } 584 585 /* Thin Provisioning VPD */ 586 static sense_reason_t 587 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) 588 { 589 struct se_device *dev = cmd->se_dev; 590 591 /* 592 * From spc3r22 section 6.5.4 Thin Provisioning VPD page: 593 * 594 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to 595 * zero, then the page length shall be set to 0004h. If the DP bit 596 * is set to one, then the page length shall be set to the value 597 * defined in table 162. 598 */ 599 buf[0] = dev->transport->get_device_type(dev); 600 601 /* 602 * Set Hardcoded length mentioned above for DP=0 603 */ 604 put_unaligned_be16(0x0004, &buf[2]); 605 606 /* 607 * The THRESHOLD EXPONENT field indicates the threshold set size in 608 * LBAs as a power of 2 (i.e., the threshold set size is equal to 609 * 2(threshold exponent)). 610 * 611 * Note that this is currently set to 0x00 as mkp says it will be 612 * changing again. We can enable this once it has settled in T10 613 * and is actually used by Linux/SCSI ML code. 614 */ 615 buf[4] = 0x00; 616 617 /* 618 * A TPU bit set to one indicates that the device server supports 619 * the UNMAP command (see 5.25). A TPU bit set to zero indicates 620 * that the device server does not support the UNMAP command. 621 */ 622 if (dev->dev_attrib.emulate_tpu != 0) 623 buf[5] = 0x80; 624 625 /* 626 * A TPWS bit set to one indicates that the device server supports 627 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. 628 * A TPWS bit set to zero indicates that the device server does not 629 * support the use of the WRITE SAME (16) command to unmap LBAs. 630 */ 631 if (dev->dev_attrib.emulate_tpws != 0) 632 buf[5] |= 0x40 | 0x20; 633 634 /* 635 * The unmap_zeroes_data set means that the underlying device supports 636 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This 637 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent 638 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA 639 * See sbc4r36 6.6.4. 640 */ 641 if (((dev->dev_attrib.emulate_tpu != 0) || 642 (dev->dev_attrib.emulate_tpws != 0)) && 643 (dev->dev_attrib.unmap_zeroes_data != 0)) 644 buf[5] |= 0x04; 645 646 return 0; 647 } 648 649 /* Referrals VPD page */ 650 static sense_reason_t 651 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) 652 { 653 struct se_device *dev = cmd->se_dev; 654 655 buf[0] = dev->transport->get_device_type(dev); 656 buf[3] = 0x0c; 657 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); 658 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); 659 660 return 0; 661 } 662 663 static sense_reason_t 664 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); 665 666 static struct { 667 uint8_t page; 668 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *); 669 } evpd_handlers[] = { 670 { .page = 0x00, .emulate = spc_emulate_evpd_00 }, 671 { .page = 0x80, .emulate = spc_emulate_evpd_80 }, 672 { .page = 0x83, .emulate = spc_emulate_evpd_83 }, 673 { .page = 0x86, .emulate = spc_emulate_evpd_86 }, 674 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, 675 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, 676 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, 677 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, 678 }; 679 680 /* supported vital product data pages */ 681 static sense_reason_t 682 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) 683 { 684 int p; 685 686 /* 687 * Only report the INQUIRY EVPD=1 pages after a valid NAA 688 * Registered Extended LUN WWN has been set via ConfigFS 689 * during device creation/restart. 690 */ 691 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 692 buf[3] = ARRAY_SIZE(evpd_handlers); 693 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) 694 buf[p + 4] = evpd_handlers[p].page; 695 } 696 697 return 0; 698 } 699 700 static sense_reason_t 701 spc_emulate_inquiry(struct se_cmd *cmd) 702 { 703 struct se_device *dev = cmd->se_dev; 704 struct se_portal_group *tpg = cmd->se_lun->lun_tpg; 705 unsigned char *rbuf; 706 unsigned char *cdb = cmd->t_task_cdb; 707 unsigned char *buf; 708 sense_reason_t ret; 709 int p; 710 int len = 0; 711 712 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); 713 if (!buf) { 714 pr_err("Unable to allocate response buffer for INQUIRY\n"); 715 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 716 } 717 718 if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev)) 719 buf[0] = 0x3f; /* Not connected */ 720 else 721 buf[0] = dev->transport->get_device_type(dev); 722 723 if (!(cdb[1] & 0x1)) { 724 if (cdb[2]) { 725 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", 726 cdb[2]); 727 ret = TCM_INVALID_CDB_FIELD; 728 goto out; 729 } 730 731 ret = spc_emulate_inquiry_std(cmd, buf); 732 len = buf[4] + 5; 733 goto out; 734 } 735 736 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { 737 if (cdb[2] == evpd_handlers[p].page) { 738 buf[1] = cdb[2]; 739 ret = evpd_handlers[p].emulate(cmd, buf); 740 len = get_unaligned_be16(&buf[2]) + 4; 741 goto out; 742 } 743 } 744 745 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); 746 ret = TCM_INVALID_CDB_FIELD; 747 748 out: 749 rbuf = transport_kmap_data_sg(cmd); 750 if (rbuf) { 751 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); 752 transport_kunmap_data_sg(cmd); 753 } 754 kfree(buf); 755 756 if (!ret) 757 target_complete_cmd_with_length(cmd, GOOD, len); 758 return ret; 759 } 760 761 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) 762 { 763 p[0] = 0x01; 764 p[1] = 0x0a; 765 766 /* No changeable values for now */ 767 if (pc == 1) 768 goto out; 769 770 out: 771 return 12; 772 } 773 774 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) 775 { 776 struct se_device *dev = cmd->se_dev; 777 struct se_session *sess = cmd->se_sess; 778 779 p[0] = 0x0a; 780 p[1] = 0x0a; 781 782 /* No changeable values for now */ 783 if (pc == 1) 784 goto out; 785 786 /* GLTSD: No implicit save of log parameters */ 787 p[2] = (1 << 1); 788 if (target_sense_desc_format(dev)) 789 /* D_SENSE: Descriptor format sense data for 64bit sectors */ 790 p[2] |= (1 << 2); 791 792 /* 793 * From spc4r23, 7.4.7 Control mode page 794 * 795 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies 796 * restrictions on the algorithm used for reordering commands 797 * having the SIMPLE task attribute (see SAM-4). 798 * 799 * Table 368 -- QUEUE ALGORITHM MODIFIER field 800 * Code Description 801 * 0h Restricted reordering 802 * 1h Unrestricted reordering allowed 803 * 2h to 7h Reserved 804 * 8h to Fh Vendor specific 805 * 806 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that 807 * the device server shall order the processing sequence of commands 808 * having the SIMPLE task attribute such that data integrity is maintained 809 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol 810 * requests is halted at any time, the final value of all data observable 811 * on the medium shall be the same as if all the commands had been processed 812 * with the ORDERED task attribute). 813 * 814 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the 815 * device server may reorder the processing sequence of commands having the 816 * SIMPLE task attribute in any manner. Any data integrity exposures related to 817 * command sequence order shall be explicitly handled by the application client 818 * through the selection of appropriate ommands and task attributes. 819 */ 820 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; 821 /* 822 * From spc4r17, section 7.4.6 Control mode Page 823 * 824 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 825 * 826 * 00b: The logical unit shall clear any unit attention condition 827 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 828 * status and shall not establish a unit attention condition when a com- 829 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 830 * status. 831 * 832 * 10b: The logical unit shall not clear any unit attention condition 833 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 834 * status and shall not establish a unit attention condition when 835 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 836 * CONFLICT status. 837 * 838 * 11b a The logical unit shall not clear any unit attention condition 839 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 840 * status and shall establish a unit attention condition for the 841 * initiator port associated with the I_T nexus on which the BUSY, 842 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 843 * Depending on the status, the additional sense code shall be set to 844 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 845 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 846 * command, a unit attention condition shall be established only once 847 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 848 * to the number of commands completed with one of those status codes. 849 */ 850 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : 851 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00; 852 /* 853 * From spc4r17, section 7.4.6 Control mode Page 854 * 855 * Task Aborted Status (TAS) bit set to zero. 856 * 857 * A task aborted status (TAS) bit set to zero specifies that aborted 858 * tasks shall be terminated by the device server without any response 859 * to the application client. A TAS bit set to one specifies that tasks 860 * aborted by the actions of an I_T nexus other than the I_T nexus on 861 * which the command was received shall be completed with TASK ABORTED 862 * status (see SAM-4). 863 */ 864 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 865 /* 866 * From spc4r30, section 7.5.7 Control mode page 867 * 868 * Application Tag Owner (ATO) bit set to one. 869 * 870 * If the ATO bit is set to one the device server shall not modify the 871 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 872 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 873 * TAG field. 874 */ 875 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 876 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 877 p[5] |= 0x80; 878 } 879 880 p[8] = 0xff; 881 p[9] = 0xff; 882 p[11] = 30; 883 884 out: 885 return 12; 886 } 887 888 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 889 { 890 struct se_device *dev = cmd->se_dev; 891 892 p[0] = 0x08; 893 p[1] = 0x12; 894 895 /* No changeable values for now */ 896 if (pc == 1) 897 goto out; 898 899 if (target_check_wce(dev)) 900 p[2] = 0x04; /* Write Cache Enable */ 901 p[12] = 0x20; /* Disabled Read Ahead */ 902 903 out: 904 return 20; 905 } 906 907 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 908 { 909 p[0] = 0x1c; 910 p[1] = 0x0a; 911 912 /* No changeable values for now */ 913 if (pc == 1) 914 goto out; 915 916 out: 917 return 12; 918 } 919 920 static struct { 921 uint8_t page; 922 uint8_t subpage; 923 int (*emulate)(struct se_cmd *, u8, unsigned char *); 924 } modesense_handlers[] = { 925 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 926 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 927 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 928 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 929 }; 930 931 static void spc_modesense_write_protect(unsigned char *buf, int type) 932 { 933 /* 934 * I believe that the WP bit (bit 7) in the mode header is the same for 935 * all device types.. 936 */ 937 switch (type) { 938 case TYPE_DISK: 939 case TYPE_TAPE: 940 default: 941 buf[0] |= 0x80; /* WP bit */ 942 break; 943 } 944 } 945 946 static void spc_modesense_dpofua(unsigned char *buf, int type) 947 { 948 switch (type) { 949 case TYPE_DISK: 950 buf[0] |= 0x10; /* DPOFUA bit */ 951 break; 952 default: 953 break; 954 } 955 } 956 957 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 958 { 959 *buf++ = 8; 960 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 961 buf += 4; 962 put_unaligned_be32(block_size, buf); 963 return 9; 964 } 965 966 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 967 { 968 if (blocks <= 0xffffffff) 969 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 970 971 *buf++ = 1; /* LONGLBA */ 972 buf += 2; 973 *buf++ = 16; 974 put_unaligned_be64(blocks, buf); 975 buf += 12; 976 put_unaligned_be32(block_size, buf); 977 978 return 17; 979 } 980 981 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 982 { 983 struct se_device *dev = cmd->se_dev; 984 char *cdb = cmd->t_task_cdb; 985 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 986 int type = dev->transport->get_device_type(dev); 987 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 988 bool dbd = !!(cdb[1] & 0x08); 989 bool llba = ten ? !!(cdb[1] & 0x10) : false; 990 u8 pc = cdb[2] >> 6; 991 u8 page = cdb[2] & 0x3f; 992 u8 subpage = cdb[3]; 993 int length = 0; 994 int ret; 995 int i; 996 997 memset(buf, 0, SE_MODE_PAGE_BUF); 998 999 /* 1000 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1001 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1002 */ 1003 length = ten ? 3 : 2; 1004 1005 /* DEVICE-SPECIFIC PARAMETER */ 1006 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1007 spc_modesense_write_protect(&buf[length], type); 1008 1009 /* 1010 * SBC only allows us to enable FUA and DPO together. Fortunately 1011 * DPO is explicitly specified as a hint, so a noop is a perfectly 1012 * valid implementation. 1013 */ 1014 if (target_check_fua(dev)) 1015 spc_modesense_dpofua(&buf[length], type); 1016 1017 ++length; 1018 1019 /* BLOCK DESCRIPTOR */ 1020 1021 /* 1022 * For now we only include a block descriptor for disk (SBC) 1023 * devices; other command sets use a slightly different format. 1024 */ 1025 if (!dbd && type == TYPE_DISK) { 1026 u64 blocks = dev->transport->get_blocks(dev); 1027 u32 block_size = dev->dev_attrib.block_size; 1028 1029 if (ten) { 1030 if (llba) { 1031 length += spc_modesense_long_blockdesc(&buf[length], 1032 blocks, block_size); 1033 } else { 1034 length += 3; 1035 length += spc_modesense_blockdesc(&buf[length], 1036 blocks, block_size); 1037 } 1038 } else { 1039 length += spc_modesense_blockdesc(&buf[length], blocks, 1040 block_size); 1041 } 1042 } else { 1043 if (ten) 1044 length += 4; 1045 else 1046 length += 1; 1047 } 1048 1049 if (page == 0x3f) { 1050 if (subpage != 0x00 && subpage != 0xff) { 1051 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1052 return TCM_INVALID_CDB_FIELD; 1053 } 1054 1055 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1056 /* 1057 * Tricky way to say all subpage 00h for 1058 * subpage==0, all subpages for subpage==0xff 1059 * (and we just checked above that those are 1060 * the only two possibilities). 1061 */ 1062 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1063 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1064 if (!ten && length + ret >= 255) 1065 break; 1066 length += ret; 1067 } 1068 } 1069 1070 goto set_length; 1071 } 1072 1073 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1074 if (modesense_handlers[i].page == page && 1075 modesense_handlers[i].subpage == subpage) { 1076 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1077 goto set_length; 1078 } 1079 1080 /* 1081 * We don't intend to implement: 1082 * - obsolete page 03h "format parameters" (checked by Solaris) 1083 */ 1084 if (page != 0x03) 1085 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1086 page, subpage); 1087 1088 return TCM_UNKNOWN_MODE_PAGE; 1089 1090 set_length: 1091 if (ten) 1092 put_unaligned_be16(length - 2, buf); 1093 else 1094 buf[0] = length - 1; 1095 1096 rbuf = transport_kmap_data_sg(cmd); 1097 if (rbuf) { 1098 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1099 transport_kunmap_data_sg(cmd); 1100 } 1101 1102 target_complete_cmd_with_length(cmd, GOOD, length); 1103 return 0; 1104 } 1105 1106 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1107 { 1108 char *cdb = cmd->t_task_cdb; 1109 bool ten = cdb[0] == MODE_SELECT_10; 1110 int off = ten ? 8 : 4; 1111 bool pf = !!(cdb[1] & 0x10); 1112 u8 page, subpage; 1113 unsigned char *buf; 1114 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1115 int length; 1116 sense_reason_t ret = 0; 1117 int i; 1118 1119 if (!cmd->data_length) { 1120 target_complete_cmd(cmd, GOOD); 1121 return 0; 1122 } 1123 1124 if (cmd->data_length < off + 2) 1125 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1126 1127 buf = transport_kmap_data_sg(cmd); 1128 if (!buf) 1129 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1130 1131 if (!pf) { 1132 ret = TCM_INVALID_CDB_FIELD; 1133 goto out; 1134 } 1135 1136 page = buf[off] & 0x3f; 1137 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1138 1139 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1140 if (modesense_handlers[i].page == page && 1141 modesense_handlers[i].subpage == subpage) { 1142 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1143 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1144 goto check_contents; 1145 } 1146 1147 ret = TCM_UNKNOWN_MODE_PAGE; 1148 goto out; 1149 1150 check_contents: 1151 if (cmd->data_length < off + length) { 1152 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1153 goto out; 1154 } 1155 1156 if (memcmp(buf + off, tbuf, length)) 1157 ret = TCM_INVALID_PARAMETER_LIST; 1158 1159 out: 1160 transport_kunmap_data_sg(cmd); 1161 1162 if (!ret) 1163 target_complete_cmd(cmd, GOOD); 1164 return ret; 1165 } 1166 1167 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1168 { 1169 unsigned char *cdb = cmd->t_task_cdb; 1170 unsigned char *rbuf; 1171 u8 ua_asc = 0, ua_ascq = 0; 1172 unsigned char buf[SE_SENSE_BUF]; 1173 bool desc_format = target_sense_desc_format(cmd->se_dev); 1174 1175 memset(buf, 0, SE_SENSE_BUF); 1176 1177 if (cdb[1] & 0x01) { 1178 pr_err("REQUEST_SENSE description emulation not" 1179 " supported\n"); 1180 return TCM_INVALID_CDB_FIELD; 1181 } 1182 1183 rbuf = transport_kmap_data_sg(cmd); 1184 if (!rbuf) 1185 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1186 1187 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1188 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1189 ua_asc, ua_ascq); 1190 else 1191 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1192 1193 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1194 transport_kunmap_data_sg(cmd); 1195 1196 target_complete_cmd(cmd, GOOD); 1197 return 0; 1198 } 1199 1200 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1201 { 1202 struct se_dev_entry *deve; 1203 struct se_session *sess = cmd->se_sess; 1204 struct se_node_acl *nacl; 1205 struct scsi_lun slun; 1206 unsigned char *buf; 1207 u32 lun_count = 0, offset = 8; 1208 __be32 len; 1209 1210 buf = transport_kmap_data_sg(cmd); 1211 if (cmd->data_length && !buf) 1212 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1213 1214 /* 1215 * If no struct se_session pointer is present, this struct se_cmd is 1216 * coming via a target_core_mod PASSTHROUGH op, and not through 1217 * a $FABRIC_MOD. In that case, report LUN=0 only. 1218 */ 1219 if (!sess) 1220 goto done; 1221 1222 nacl = sess->se_node_acl; 1223 1224 rcu_read_lock(); 1225 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1226 /* 1227 * We determine the correct LUN LIST LENGTH even once we 1228 * have reached the initial allocation length. 1229 * See SPC2-R20 7.19. 1230 */ 1231 lun_count++; 1232 if (offset >= cmd->data_length) 1233 continue; 1234 1235 int_to_scsilun(deve->mapped_lun, &slun); 1236 memcpy(buf + offset, &slun, 1237 min(8u, cmd->data_length - offset)); 1238 offset += 8; 1239 } 1240 rcu_read_unlock(); 1241 1242 /* 1243 * See SPC3 r07, page 159. 1244 */ 1245 done: 1246 /* 1247 * If no LUNs are accessible, report virtual LUN 0. 1248 */ 1249 if (lun_count == 0) { 1250 int_to_scsilun(0, &slun); 1251 if (cmd->data_length > 8) 1252 memcpy(buf + offset, &slun, 1253 min(8u, cmd->data_length - offset)); 1254 lun_count = 1; 1255 } 1256 1257 if (buf) { 1258 len = cpu_to_be32(lun_count * 8); 1259 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1260 transport_kunmap_data_sg(cmd); 1261 } 1262 1263 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); 1264 return 0; 1265 } 1266 EXPORT_SYMBOL(spc_emulate_report_luns); 1267 1268 static sense_reason_t 1269 spc_emulate_testunitready(struct se_cmd *cmd) 1270 { 1271 target_complete_cmd(cmd, GOOD); 1272 return 0; 1273 } 1274 1275 sense_reason_t 1276 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1277 { 1278 struct se_device *dev = cmd->se_dev; 1279 unsigned char *cdb = cmd->t_task_cdb; 1280 1281 if (!dev->dev_attrib.emulate_pr && 1282 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1283 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1284 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1285 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1286 return TCM_UNSUPPORTED_SCSI_OPCODE; 1287 } 1288 1289 switch (cdb[0]) { 1290 case MODE_SELECT: 1291 *size = cdb[4]; 1292 cmd->execute_cmd = spc_emulate_modeselect; 1293 break; 1294 case MODE_SELECT_10: 1295 *size = get_unaligned_be16(&cdb[7]); 1296 cmd->execute_cmd = spc_emulate_modeselect; 1297 break; 1298 case MODE_SENSE: 1299 *size = cdb[4]; 1300 cmd->execute_cmd = spc_emulate_modesense; 1301 break; 1302 case MODE_SENSE_10: 1303 *size = get_unaligned_be16(&cdb[7]); 1304 cmd->execute_cmd = spc_emulate_modesense; 1305 break; 1306 case LOG_SELECT: 1307 case LOG_SENSE: 1308 *size = get_unaligned_be16(&cdb[7]); 1309 break; 1310 case PERSISTENT_RESERVE_IN: 1311 *size = get_unaligned_be16(&cdb[7]); 1312 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1313 break; 1314 case PERSISTENT_RESERVE_OUT: 1315 *size = get_unaligned_be32(&cdb[5]); 1316 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1317 break; 1318 case RELEASE: 1319 case RELEASE_10: 1320 if (cdb[0] == RELEASE_10) 1321 *size = get_unaligned_be16(&cdb[7]); 1322 else 1323 *size = cmd->data_length; 1324 1325 cmd->execute_cmd = target_scsi2_reservation_release; 1326 break; 1327 case RESERVE: 1328 case RESERVE_10: 1329 /* 1330 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1331 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1332 */ 1333 if (cdb[0] == RESERVE_10) 1334 *size = get_unaligned_be16(&cdb[7]); 1335 else 1336 *size = cmd->data_length; 1337 1338 cmd->execute_cmd = target_scsi2_reservation_reserve; 1339 break; 1340 case REQUEST_SENSE: 1341 *size = cdb[4]; 1342 cmd->execute_cmd = spc_emulate_request_sense; 1343 break; 1344 case INQUIRY: 1345 *size = get_unaligned_be16(&cdb[3]); 1346 1347 /* 1348 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1349 * See spc4r17 section 5.3 1350 */ 1351 cmd->sam_task_attr = TCM_HEAD_TAG; 1352 cmd->execute_cmd = spc_emulate_inquiry; 1353 break; 1354 case SECURITY_PROTOCOL_IN: 1355 case SECURITY_PROTOCOL_OUT: 1356 *size = get_unaligned_be32(&cdb[6]); 1357 break; 1358 case EXTENDED_COPY: 1359 *size = get_unaligned_be32(&cdb[10]); 1360 cmd->execute_cmd = target_do_xcopy; 1361 break; 1362 case RECEIVE_COPY_RESULTS: 1363 *size = get_unaligned_be32(&cdb[10]); 1364 cmd->execute_cmd = target_do_receive_copy_results; 1365 break; 1366 case READ_ATTRIBUTE: 1367 case WRITE_ATTRIBUTE: 1368 *size = get_unaligned_be32(&cdb[10]); 1369 break; 1370 case RECEIVE_DIAGNOSTIC: 1371 case SEND_DIAGNOSTIC: 1372 *size = get_unaligned_be16(&cdb[3]); 1373 break; 1374 case WRITE_BUFFER: 1375 *size = get_unaligned_be24(&cdb[6]); 1376 break; 1377 case REPORT_LUNS: 1378 cmd->execute_cmd = spc_emulate_report_luns; 1379 *size = get_unaligned_be32(&cdb[6]); 1380 /* 1381 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1382 * See spc4r17 section 5.3 1383 */ 1384 cmd->sam_task_attr = TCM_HEAD_TAG; 1385 break; 1386 case TEST_UNIT_READY: 1387 cmd->execute_cmd = spc_emulate_testunitready; 1388 *size = 0; 1389 break; 1390 case MAINTENANCE_IN: 1391 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1392 /* 1393 * MAINTENANCE_IN from SCC-2 1394 * Check for emulated MI_REPORT_TARGET_PGS 1395 */ 1396 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1397 cmd->execute_cmd = 1398 target_emulate_report_target_port_groups; 1399 } 1400 *size = get_unaligned_be32(&cdb[6]); 1401 } else { 1402 /* 1403 * GPCMD_SEND_KEY from multi media commands 1404 */ 1405 *size = get_unaligned_be16(&cdb[8]); 1406 } 1407 break; 1408 case MAINTENANCE_OUT: 1409 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1410 /* 1411 * MAINTENANCE_OUT from SCC-2 1412 * Check for emulated MO_SET_TARGET_PGS. 1413 */ 1414 if (cdb[1] == MO_SET_TARGET_PGS) { 1415 cmd->execute_cmd = 1416 target_emulate_set_target_port_groups; 1417 } 1418 *size = get_unaligned_be32(&cdb[6]); 1419 } else { 1420 /* 1421 * GPCMD_SEND_KEY from multi media commands 1422 */ 1423 *size = get_unaligned_be16(&cdb[8]); 1424 } 1425 break; 1426 default: 1427 return TCM_UNSUPPORTED_SCSI_OPCODE; 1428 } 1429 1430 return 0; 1431 } 1432 EXPORT_SYMBOL(spc_parse_cdb); 1433