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 rcu_read_lock(); 44 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 45 if (tg_pt_gp) 46 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; 47 rcu_read_unlock(); 48 } 49 50 static u16 51 spc_find_scsi_transport_vd(int proto_id) 52 { 53 switch (proto_id) { 54 case SCSI_PROTOCOL_FCP: 55 return SCSI_VERSION_DESCRIPTOR_FCP4; 56 case SCSI_PROTOCOL_ISCSI: 57 return SCSI_VERSION_DESCRIPTOR_ISCSI; 58 case SCSI_PROTOCOL_SAS: 59 return SCSI_VERSION_DESCRIPTOR_SAS3; 60 case SCSI_PROTOCOL_SBP: 61 return SCSI_VERSION_DESCRIPTOR_SBP3; 62 case SCSI_PROTOCOL_SRP: 63 return SCSI_VERSION_DESCRIPTOR_SRP; 64 default: 65 pr_warn("Cannot find VERSION DESCRIPTOR value for unknown SCSI" 66 " transport PROTOCOL IDENTIFIER %#x\n", proto_id); 67 return 0; 68 } 69 } 70 71 sense_reason_t 72 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) 73 { 74 struct se_lun *lun = cmd->se_lun; 75 struct se_portal_group *tpg = lun->lun_tpg; 76 struct se_device *dev = cmd->se_dev; 77 struct se_session *sess = cmd->se_sess; 78 79 /* Set RMB (removable media) for tape devices */ 80 if (dev->transport->get_device_type(dev) == TYPE_TAPE) 81 buf[1] = 0x80; 82 83 buf[2] = 0x06; /* SPC-4 */ 84 85 /* 86 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 87 * 88 * SPC4 says: 89 * A RESPONSE DATA FORMAT field set to 2h indicates that the 90 * standard INQUIRY data is in the format defined in this 91 * standard. Response data format values less than 2h are 92 * obsolete. Response data format values greater than 2h are 93 * reserved. 94 */ 95 buf[3] = 2; 96 97 /* 98 * Enable SCCS and TPGS fields for Emulated ALUA 99 */ 100 spc_fill_alua_data(lun, buf); 101 102 /* 103 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY 104 */ 105 if (dev->dev_attrib.emulate_3pc) 106 buf[5] |= 0x8; 107 /* 108 * Set Protection (PROTECT) bit when DIF has been enabled on the 109 * device, and the fabric supports VERIFY + PASS. Also report 110 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI 111 * to unprotected devices. 112 */ 113 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 114 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) 115 buf[5] |= 0x1; 116 } 117 118 /* 119 * Set MULTIP bit to indicate presence of multiple SCSI target ports 120 */ 121 if (dev->export_count > 1) 122 buf[6] |= 0x10; 123 124 buf[7] = 0x2; /* CmdQue=1 */ 125 126 /* 127 * ASCII data fields described as being left-aligned shall have any 128 * unused bytes at the end of the field (i.e., highest offset) and the 129 * unused bytes shall be filled with ASCII space characters (20h). 130 */ 131 memset(&buf[8], 0x20, 132 INQUIRY_VENDOR_LEN + INQUIRY_MODEL_LEN + INQUIRY_REVISION_LEN); 133 memcpy(&buf[8], dev->t10_wwn.vendor, 134 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 135 memcpy(&buf[16], dev->t10_wwn.model, 136 strnlen(dev->t10_wwn.model, INQUIRY_MODEL_LEN)); 137 memcpy(&buf[32], dev->t10_wwn.revision, 138 strnlen(dev->t10_wwn.revision, INQUIRY_REVISION_LEN)); 139 140 /* 141 * Set the VERSION DESCRIPTOR fields 142 */ 143 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SAM5, &buf[58]); 144 put_unaligned_be16(spc_find_scsi_transport_vd(tpg->proto_id), &buf[60]); 145 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SPC4, &buf[62]); 146 if (cmd->se_dev->transport->get_device_type(dev) == TYPE_DISK) 147 put_unaligned_be16(SCSI_VERSION_DESCRIPTOR_SBC3, &buf[64]); 148 149 buf[4] = 91; /* Set additional length to 91 */ 150 151 return 0; 152 } 153 EXPORT_SYMBOL(spc_emulate_inquiry_std); 154 155 /* unit serial number */ 156 static sense_reason_t 157 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) 158 { 159 struct se_device *dev = cmd->se_dev; 160 u16 len; 161 162 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 163 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); 164 len++; /* Extra Byte for NULL Terminator */ 165 buf[3] = len; 166 } 167 return 0; 168 } 169 170 /* 171 * Generate NAA IEEE Registered Extended designator 172 */ 173 void spc_gen_naa_6h_vendor_specific(struct se_device *dev, 174 unsigned char *buf) 175 { 176 unsigned char *p = &dev->t10_wwn.unit_serial[0]; 177 u32 company_id = dev->t10_wwn.company_id; 178 int cnt, off = 0; 179 bool next = true; 180 181 /* 182 * Start NAA IEEE Registered Extended Identifier/Designator 183 */ 184 buf[off] = 0x6 << 4; 185 186 /* IEEE COMPANY_ID */ 187 buf[off++] |= (company_id >> 20) & 0xf; 188 buf[off++] = (company_id >> 12) & 0xff; 189 buf[off++] = (company_id >> 4) & 0xff; 190 buf[off] = (company_id & 0xf) << 4; 191 192 /* 193 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on 194 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field 195 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION 196 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL 197 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure 198 * per device uniqeness. 199 */ 200 for (cnt = off + 13; *p && off < cnt; p++) { 201 int val = hex_to_bin(*p); 202 203 if (val < 0) 204 continue; 205 206 if (next) { 207 next = false; 208 buf[off++] |= val; 209 } else { 210 next = true; 211 buf[off] = val << 4; 212 } 213 } 214 } 215 216 /* 217 * Device identification VPD, for a complete list of 218 * DESIGNATOR TYPEs see spc4r17 Table 459. 219 */ 220 sense_reason_t 221 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) 222 { 223 struct se_device *dev = cmd->se_dev; 224 struct se_lun *lun = cmd->se_lun; 225 struct se_portal_group *tpg = NULL; 226 struct t10_alua_lu_gp_member *lu_gp_mem; 227 struct t10_alua_tg_pt_gp *tg_pt_gp; 228 unsigned char *prod = &dev->t10_wwn.model[0]; 229 u32 prod_len; 230 u32 unit_serial_len, off = 0; 231 u16 len = 0, id_len; 232 233 off = 4; 234 235 /* 236 * NAA IEEE Registered Extended Assigned designator format, see 237 * spc4r17 section 7.7.3.6.5 238 * 239 * We depend upon a target_core_mod/ConfigFS provided 240 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial 241 * value in order to return the NAA id. 242 */ 243 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)) 244 goto check_t10_vend_desc; 245 246 /* CODE SET == Binary */ 247 buf[off++] = 0x1; 248 249 /* Set ASSOCIATION == addressed logical unit: 0)b */ 250 buf[off] = 0x00; 251 252 /* Identifier/Designator type == NAA identifier */ 253 buf[off++] |= 0x3; 254 off++; 255 256 /* Identifier/Designator length */ 257 buf[off++] = 0x10; 258 259 /* NAA IEEE Registered Extended designator */ 260 spc_gen_naa_6h_vendor_specific(dev, &buf[off]); 261 262 len = 20; 263 off = (len + 4); 264 265 check_t10_vend_desc: 266 /* 267 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 268 */ 269 id_len = 8; /* For Vendor field */ 270 prod_len = 4; /* For VPD Header */ 271 prod_len += 8; /* For Vendor field */ 272 prod_len += strlen(prod); 273 prod_len++; /* For : */ 274 275 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 276 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); 277 unit_serial_len++; /* For NULL Terminator */ 278 279 id_len += sprintf(&buf[off+12], "%s:%s", prod, 280 &dev->t10_wwn.unit_serial[0]); 281 } 282 buf[off] = 0x2; /* ASCII */ 283 buf[off+1] = 0x1; /* T10 Vendor ID */ 284 buf[off+2] = 0x0; 285 /* left align Vendor ID and pad with spaces */ 286 memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN); 287 memcpy(&buf[off+4], dev->t10_wwn.vendor, 288 strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN)); 289 /* Extra Byte for NULL Terminator */ 290 id_len++; 291 /* Identifier Length */ 292 buf[off+3] = id_len; 293 /* Header size for Designation descriptor */ 294 len += (id_len + 4); 295 off += (id_len + 4); 296 297 if (1) { 298 struct t10_alua_lu_gp *lu_gp; 299 u32 padding, scsi_name_len, scsi_target_len; 300 u16 lu_gp_id = 0; 301 u16 tg_pt_gp_id = 0; 302 u16 tpgt; 303 304 tpg = lun->lun_tpg; 305 /* 306 * Relative target port identifer, see spc4r17 307 * section 7.7.3.7 308 * 309 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 310 * section 7.5.1 Table 362 311 */ 312 buf[off] = tpg->proto_id << 4; 313 buf[off++] |= 0x1; /* CODE SET == Binary */ 314 buf[off] = 0x80; /* Set PIV=1 */ 315 /* Set ASSOCIATION == target port: 01b */ 316 buf[off] |= 0x10; 317 /* DESIGNATOR TYPE == Relative target port identifer */ 318 buf[off++] |= 0x4; 319 off++; /* Skip over Reserved */ 320 buf[off++] = 4; /* DESIGNATOR LENGTH */ 321 /* Skip over Obsolete field in RTPI payload 322 * in Table 472 */ 323 off += 2; 324 put_unaligned_be16(lun->lun_rtpi, &buf[off]); 325 off += 2; 326 len += 8; /* Header size + Designation descriptor */ 327 /* 328 * Target port group identifier, see spc4r17 329 * section 7.7.3.8 330 * 331 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 332 * section 7.5.1 Table 362 333 */ 334 rcu_read_lock(); 335 tg_pt_gp = rcu_dereference(lun->lun_tg_pt_gp); 336 if (!tg_pt_gp) { 337 rcu_read_unlock(); 338 goto check_lu_gp; 339 } 340 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 341 rcu_read_unlock(); 342 343 buf[off] = tpg->proto_id << 4; 344 buf[off++] |= 0x1; /* CODE SET == Binary */ 345 buf[off] = 0x80; /* Set PIV=1 */ 346 /* Set ASSOCIATION == target port: 01b */ 347 buf[off] |= 0x10; 348 /* DESIGNATOR TYPE == Target port group identifier */ 349 buf[off++] |= 0x5; 350 off++; /* Skip over Reserved */ 351 buf[off++] = 4; /* DESIGNATOR LENGTH */ 352 off += 2; /* Skip over Reserved Field */ 353 put_unaligned_be16(tg_pt_gp_id, &buf[off]); 354 off += 2; 355 len += 8; /* Header size + Designation descriptor */ 356 /* 357 * Logical Unit Group identifier, see spc4r17 358 * section 7.7.3.8 359 */ 360 check_lu_gp: 361 lu_gp_mem = dev->dev_alua_lu_gp_mem; 362 if (!lu_gp_mem) 363 goto check_scsi_name; 364 365 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 366 lu_gp = lu_gp_mem->lu_gp; 367 if (!lu_gp) { 368 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 369 goto check_scsi_name; 370 } 371 lu_gp_id = lu_gp->lu_gp_id; 372 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 373 374 buf[off++] |= 0x1; /* CODE SET == Binary */ 375 /* DESIGNATOR TYPE == Logical Unit Group identifier */ 376 buf[off++] |= 0x6; 377 off++; /* Skip over Reserved */ 378 buf[off++] = 4; /* DESIGNATOR LENGTH */ 379 off += 2; /* Skip over Reserved Field */ 380 put_unaligned_be16(lu_gp_id, &buf[off]); 381 off += 2; 382 len += 8; /* Header size + Designation descriptor */ 383 /* 384 * SCSI name string designator, see spc4r17 385 * section 7.7.3.11 386 * 387 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 388 * section 7.5.1 Table 362 389 */ 390 check_scsi_name: 391 buf[off] = tpg->proto_id << 4; 392 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 393 buf[off] = 0x80; /* Set PIV=1 */ 394 /* Set ASSOCIATION == target port: 01b */ 395 buf[off] |= 0x10; 396 /* DESIGNATOR TYPE == SCSI name string */ 397 buf[off++] |= 0x8; 398 off += 2; /* Skip over Reserved and length */ 399 /* 400 * SCSI name string identifer containing, $FABRIC_MOD 401 * dependent information. For LIO-Target and iSCSI 402 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in 403 * UTF-8 encoding. 404 */ 405 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 406 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", 407 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); 408 scsi_name_len += 1 /* Include NULL terminator */; 409 /* 410 * The null-terminated, null-padded (see 4.4.2) SCSI 411 * NAME STRING field contains a UTF-8 format string. 412 * The number of bytes in the SCSI NAME STRING field 413 * (i.e., the value in the DESIGNATOR LENGTH field) 414 * shall be no larger than 256 and shall be a multiple 415 * of four. 416 */ 417 padding = ((-scsi_name_len) & 3); 418 if (padding) 419 scsi_name_len += padding; 420 if (scsi_name_len > 256) 421 scsi_name_len = 256; 422 423 buf[off-1] = scsi_name_len; 424 off += scsi_name_len; 425 /* Header size + Designation descriptor */ 426 len += (scsi_name_len + 4); 427 428 /* 429 * Target device designator 430 */ 431 buf[off] = tpg->proto_id << 4; 432 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 433 buf[off] = 0x80; /* Set PIV=1 */ 434 /* Set ASSOCIATION == target device: 10b */ 435 buf[off] |= 0x20; 436 /* DESIGNATOR TYPE == SCSI name string */ 437 buf[off++] |= 0x8; 438 off += 2; /* Skip over Reserved and length */ 439 /* 440 * SCSI name string identifer containing, $FABRIC_MOD 441 * dependent information. For LIO-Target and iSCSI 442 * Target Port, this means "<iSCSI name>" in 443 * UTF-8 encoding. 444 */ 445 scsi_target_len = sprintf(&buf[off], "%s", 446 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 447 scsi_target_len += 1 /* Include NULL terminator */; 448 /* 449 * The null-terminated, null-padded (see 4.4.2) SCSI 450 * NAME STRING field contains a UTF-8 format string. 451 * The number of bytes in the SCSI NAME STRING field 452 * (i.e., the value in the DESIGNATOR LENGTH field) 453 * shall be no larger than 256 and shall be a multiple 454 * of four. 455 */ 456 padding = ((-scsi_target_len) & 3); 457 if (padding) 458 scsi_target_len += padding; 459 if (scsi_target_len > 256) 460 scsi_target_len = 256; 461 462 buf[off-1] = scsi_target_len; 463 off += scsi_target_len; 464 465 /* Header size + Designation descriptor */ 466 len += (scsi_target_len + 4); 467 } 468 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */ 469 return 0; 470 } 471 EXPORT_SYMBOL(spc_emulate_evpd_83); 472 473 /* Extended INQUIRY Data VPD Page */ 474 static sense_reason_t 475 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) 476 { 477 struct se_device *dev = cmd->se_dev; 478 struct se_session *sess = cmd->se_sess; 479 480 buf[3] = 0x3c; 481 /* 482 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK 483 * only for TYPE3 protection. 484 */ 485 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 486 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || 487 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) 488 buf[4] = 0x5; 489 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || 490 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) 491 buf[4] = 0x4; 492 } 493 494 /* logical unit supports type 1 and type 3 protection */ 495 if ((dev->transport->get_device_type(dev) == TYPE_DISK) && 496 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) && 497 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) { 498 buf[4] |= (0x3 << 3); 499 } 500 501 /* Set HEADSUP, ORDSUP, SIMPSUP */ 502 buf[5] = 0x07; 503 504 /* If WriteCache emulation is enabled, set V_SUP */ 505 if (target_check_wce(dev)) 506 buf[6] = 0x01; 507 /* If an LBA map is present set R_SUP */ 508 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); 509 if (!list_empty(&dev->t10_alua.lba_map_list)) 510 buf[8] = 0x10; 511 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); 512 return 0; 513 } 514 515 /* Block Limits VPD page */ 516 static sense_reason_t 517 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) 518 { 519 struct se_device *dev = cmd->se_dev; 520 u32 mtl = 0; 521 int have_tp = 0, opt, min; 522 523 /* 524 * Following spc3r22 section 6.5.3 Block Limits VPD page, when 525 * emulate_tpu=1 or emulate_tpws=1 we will be expect a 526 * different page length for Thin Provisioning. 527 */ 528 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 529 have_tp = 1; 530 531 buf[0] = dev->transport->get_device_type(dev); 532 buf[3] = have_tp ? 0x3c : 0x10; 533 534 /* Set WSNZ to 1 */ 535 buf[4] = 0x01; 536 /* 537 * Set MAXIMUM COMPARE AND WRITE LENGTH 538 */ 539 if (dev->dev_attrib.emulate_caw) 540 buf[5] = 0x01; 541 542 /* 543 * Set OPTIMAL TRANSFER LENGTH GRANULARITY 544 */ 545 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) 546 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); 547 else 548 put_unaligned_be16(1, &buf[6]); 549 550 /* 551 * Set MAXIMUM TRANSFER LENGTH 552 * 553 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics 554 * enforcing maximum HW scatter-gather-list entry limit 555 */ 556 if (cmd->se_tfo->max_data_sg_nents) { 557 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) / 558 dev->dev_attrib.block_size; 559 } 560 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]); 561 562 /* 563 * Set OPTIMAL TRANSFER LENGTH 564 */ 565 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) 566 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); 567 else 568 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); 569 570 /* 571 * Exit now if we don't support TP. 572 */ 573 if (!have_tp) 574 goto max_write_same; 575 576 /* 577 * Set MAXIMUM UNMAP LBA COUNT 578 */ 579 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); 580 581 /* 582 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT 583 */ 584 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, 585 &buf[24]); 586 587 /* 588 * Set OPTIMAL UNMAP GRANULARITY 589 */ 590 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); 591 592 /* 593 * UNMAP GRANULARITY ALIGNMENT 594 */ 595 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, 596 &buf[32]); 597 if (dev->dev_attrib.unmap_granularity_alignment != 0) 598 buf[32] |= 0x80; /* Set the UGAVALID bit */ 599 600 /* 601 * MAXIMUM WRITE SAME LENGTH 602 */ 603 max_write_same: 604 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); 605 606 return 0; 607 } 608 609 /* Block Device Characteristics VPD page */ 610 static sense_reason_t 611 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) 612 { 613 struct se_device *dev = cmd->se_dev; 614 615 buf[0] = dev->transport->get_device_type(dev); 616 buf[3] = 0x3c; 617 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0; 618 619 return 0; 620 } 621 622 /* Thin Provisioning VPD */ 623 static sense_reason_t 624 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) 625 { 626 struct se_device *dev = cmd->se_dev; 627 628 /* 629 * From spc3r22 section 6.5.4 Thin Provisioning VPD page: 630 * 631 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to 632 * zero, then the page length shall be set to 0004h. If the DP bit 633 * is set to one, then the page length shall be set to the value 634 * defined in table 162. 635 */ 636 buf[0] = dev->transport->get_device_type(dev); 637 638 /* 639 * Set Hardcoded length mentioned above for DP=0 640 */ 641 put_unaligned_be16(0x0004, &buf[2]); 642 643 /* 644 * The THRESHOLD EXPONENT field indicates the threshold set size in 645 * LBAs as a power of 2 (i.e., the threshold set size is equal to 646 * 2(threshold exponent)). 647 * 648 * Note that this is currently set to 0x00 as mkp says it will be 649 * changing again. We can enable this once it has settled in T10 650 * and is actually used by Linux/SCSI ML code. 651 */ 652 buf[4] = 0x00; 653 654 /* 655 * A TPU bit set to one indicates that the device server supports 656 * the UNMAP command (see 5.25). A TPU bit set to zero indicates 657 * that the device server does not support the UNMAP command. 658 */ 659 if (dev->dev_attrib.emulate_tpu != 0) 660 buf[5] = 0x80; 661 662 /* 663 * A TPWS bit set to one indicates that the device server supports 664 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. 665 * A TPWS bit set to zero indicates that the device server does not 666 * support the use of the WRITE SAME (16) command to unmap LBAs. 667 */ 668 if (dev->dev_attrib.emulate_tpws != 0) 669 buf[5] |= 0x40 | 0x20; 670 671 /* 672 * The unmap_zeroes_data set means that the underlying device supports 673 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This 674 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent 675 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA 676 * See sbc4r36 6.6.4. 677 */ 678 if (((dev->dev_attrib.emulate_tpu != 0) || 679 (dev->dev_attrib.emulate_tpws != 0)) && 680 (dev->dev_attrib.unmap_zeroes_data != 0)) 681 buf[5] |= 0x04; 682 683 return 0; 684 } 685 686 /* Referrals VPD page */ 687 static sense_reason_t 688 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) 689 { 690 struct se_device *dev = cmd->se_dev; 691 692 buf[0] = dev->transport->get_device_type(dev); 693 buf[3] = 0x0c; 694 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); 695 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); 696 697 return 0; 698 } 699 700 static sense_reason_t 701 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); 702 703 static struct { 704 uint8_t page; 705 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *); 706 } evpd_handlers[] = { 707 { .page = 0x00, .emulate = spc_emulate_evpd_00 }, 708 { .page = 0x80, .emulate = spc_emulate_evpd_80 }, 709 { .page = 0x83, .emulate = spc_emulate_evpd_83 }, 710 { .page = 0x86, .emulate = spc_emulate_evpd_86 }, 711 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, 712 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, 713 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, 714 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, 715 }; 716 717 /* supported vital product data pages */ 718 static sense_reason_t 719 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) 720 { 721 int p; 722 723 /* 724 * Only report the INQUIRY EVPD=1 pages after a valid NAA 725 * Registered Extended LUN WWN has been set via ConfigFS 726 * during device creation/restart. 727 */ 728 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 729 buf[3] = ARRAY_SIZE(evpd_handlers); 730 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) 731 buf[p + 4] = evpd_handlers[p].page; 732 } 733 734 return 0; 735 } 736 737 static sense_reason_t 738 spc_emulate_inquiry(struct se_cmd *cmd) 739 { 740 struct se_device *dev = cmd->se_dev; 741 unsigned char *rbuf; 742 unsigned char *cdb = cmd->t_task_cdb; 743 unsigned char *buf; 744 sense_reason_t ret; 745 int p; 746 int len = 0; 747 748 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); 749 if (!buf) { 750 pr_err("Unable to allocate response buffer for INQUIRY\n"); 751 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 752 } 753 754 buf[0] = dev->transport->get_device_type(dev); 755 756 if (!(cdb[1] & 0x1)) { 757 if (cdb[2]) { 758 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", 759 cdb[2]); 760 ret = TCM_INVALID_CDB_FIELD; 761 goto out; 762 } 763 764 ret = spc_emulate_inquiry_std(cmd, buf); 765 len = buf[4] + 5; 766 goto out; 767 } 768 769 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { 770 if (cdb[2] == evpd_handlers[p].page) { 771 buf[1] = cdb[2]; 772 ret = evpd_handlers[p].emulate(cmd, buf); 773 len = get_unaligned_be16(&buf[2]) + 4; 774 goto out; 775 } 776 } 777 778 pr_debug("Unknown VPD Code: 0x%02x\n", cdb[2]); 779 ret = TCM_INVALID_CDB_FIELD; 780 781 out: 782 rbuf = transport_kmap_data_sg(cmd); 783 if (rbuf) { 784 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); 785 transport_kunmap_data_sg(cmd); 786 } 787 kfree(buf); 788 789 if (!ret) 790 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, len); 791 return ret; 792 } 793 794 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) 795 { 796 p[0] = 0x01; 797 p[1] = 0x0a; 798 799 /* No changeable values for now */ 800 if (pc == 1) 801 goto out; 802 803 out: 804 return 12; 805 } 806 807 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) 808 { 809 struct se_device *dev = cmd->se_dev; 810 struct se_session *sess = cmd->se_sess; 811 812 p[0] = 0x0a; 813 p[1] = 0x0a; 814 815 /* No changeable values for now */ 816 if (pc == 1) 817 goto out; 818 819 /* GLTSD: No implicit save of log parameters */ 820 p[2] = (1 << 1); 821 if (target_sense_desc_format(dev)) 822 /* D_SENSE: Descriptor format sense data for 64bit sectors */ 823 p[2] |= (1 << 2); 824 825 /* 826 * From spc4r23, 7.4.7 Control mode page 827 * 828 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies 829 * restrictions on the algorithm used for reordering commands 830 * having the SIMPLE task attribute (see SAM-4). 831 * 832 * Table 368 -- QUEUE ALGORITHM MODIFIER field 833 * Code Description 834 * 0h Restricted reordering 835 * 1h Unrestricted reordering allowed 836 * 2h to 7h Reserved 837 * 8h to Fh Vendor specific 838 * 839 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that 840 * the device server shall order the processing sequence of commands 841 * having the SIMPLE task attribute such that data integrity is maintained 842 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol 843 * requests is halted at any time, the final value of all data observable 844 * on the medium shall be the same as if all the commands had been processed 845 * with the ORDERED task attribute). 846 * 847 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the 848 * device server may reorder the processing sequence of commands having the 849 * SIMPLE task attribute in any manner. Any data integrity exposures related to 850 * command sequence order shall be explicitly handled by the application client 851 * through the selection of appropriate ommands and task attributes. 852 */ 853 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; 854 /* 855 * From spc4r17, section 7.4.6 Control mode Page 856 * 857 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 858 * 859 * 00b: The logical unit shall clear any unit attention condition 860 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 861 * status and shall not establish a unit attention condition when a com- 862 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 863 * status. 864 * 865 * 10b: The logical unit shall not clear any unit attention condition 866 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 867 * status and shall not establish a unit attention condition when 868 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 869 * CONFLICT status. 870 * 871 * 11b a The logical unit shall not clear any unit attention condition 872 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 873 * status and shall establish a unit attention condition for the 874 * initiator port associated with the I_T nexus on which the BUSY, 875 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 876 * Depending on the status, the additional sense code shall be set to 877 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 878 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 879 * command, a unit attention condition shall be established only once 880 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 881 * to the number of commands completed with one of those status codes. 882 */ 883 switch (dev->dev_attrib.emulate_ua_intlck_ctrl) { 884 case TARGET_UA_INTLCK_CTRL_ESTABLISH_UA: 885 p[4] = 0x30; 886 break; 887 case TARGET_UA_INTLCK_CTRL_NO_CLEAR: 888 p[4] = 0x20; 889 break; 890 default: /* TARGET_UA_INTLCK_CTRL_CLEAR */ 891 p[4] = 0x00; 892 break; 893 } 894 /* 895 * From spc4r17, section 7.4.6 Control mode Page 896 * 897 * Task Aborted Status (TAS) bit set to zero. 898 * 899 * A task aborted status (TAS) bit set to zero specifies that aborted 900 * tasks shall be terminated by the device server without any response 901 * to the application client. A TAS bit set to one specifies that tasks 902 * aborted by the actions of an I_T nexus other than the I_T nexus on 903 * which the command was received shall be completed with TASK ABORTED 904 * status (see SAM-4). 905 */ 906 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 907 /* 908 * From spc4r30, section 7.5.7 Control mode page 909 * 910 * Application Tag Owner (ATO) bit set to one. 911 * 912 * If the ATO bit is set to one the device server shall not modify the 913 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 914 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 915 * TAG field. 916 */ 917 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 918 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 919 p[5] |= 0x80; 920 } 921 922 p[8] = 0xff; 923 p[9] = 0xff; 924 p[11] = 30; 925 926 out: 927 return 12; 928 } 929 930 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 931 { 932 struct se_device *dev = cmd->se_dev; 933 934 p[0] = 0x08; 935 p[1] = 0x12; 936 937 /* No changeable values for now */ 938 if (pc == 1) 939 goto out; 940 941 if (target_check_wce(dev)) 942 p[2] = 0x04; /* Write Cache Enable */ 943 p[12] = 0x20; /* Disabled Read Ahead */ 944 945 out: 946 return 20; 947 } 948 949 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 950 { 951 p[0] = 0x1c; 952 p[1] = 0x0a; 953 954 /* No changeable values for now */ 955 if (pc == 1) 956 goto out; 957 958 out: 959 return 12; 960 } 961 962 static struct { 963 uint8_t page; 964 uint8_t subpage; 965 int (*emulate)(struct se_cmd *, u8, unsigned char *); 966 } modesense_handlers[] = { 967 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 968 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 969 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 970 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 971 }; 972 973 static void spc_modesense_write_protect(unsigned char *buf, int type) 974 { 975 /* 976 * I believe that the WP bit (bit 7) in the mode header is the same for 977 * all device types.. 978 */ 979 switch (type) { 980 case TYPE_DISK: 981 case TYPE_TAPE: 982 default: 983 buf[0] |= 0x80; /* WP bit */ 984 break; 985 } 986 } 987 988 static void spc_modesense_dpofua(unsigned char *buf, int type) 989 { 990 switch (type) { 991 case TYPE_DISK: 992 buf[0] |= 0x10; /* DPOFUA bit */ 993 break; 994 default: 995 break; 996 } 997 } 998 999 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 1000 { 1001 *buf++ = 8; 1002 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 1003 buf += 4; 1004 put_unaligned_be32(block_size, buf); 1005 return 9; 1006 } 1007 1008 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 1009 { 1010 if (blocks <= 0xffffffff) 1011 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 1012 1013 *buf++ = 1; /* LONGLBA */ 1014 buf += 2; 1015 *buf++ = 16; 1016 put_unaligned_be64(blocks, buf); 1017 buf += 12; 1018 put_unaligned_be32(block_size, buf); 1019 1020 return 17; 1021 } 1022 1023 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 1024 { 1025 struct se_device *dev = cmd->se_dev; 1026 char *cdb = cmd->t_task_cdb; 1027 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 1028 int type = dev->transport->get_device_type(dev); 1029 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 1030 bool dbd = !!(cdb[1] & 0x08); 1031 bool llba = ten ? !!(cdb[1] & 0x10) : false; 1032 u8 pc = cdb[2] >> 6; 1033 u8 page = cdb[2] & 0x3f; 1034 u8 subpage = cdb[3]; 1035 int length = 0; 1036 int ret; 1037 int i; 1038 1039 memset(buf, 0, SE_MODE_PAGE_BUF); 1040 1041 /* 1042 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1043 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1044 */ 1045 length = ten ? 3 : 2; 1046 1047 /* DEVICE-SPECIFIC PARAMETER */ 1048 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1049 spc_modesense_write_protect(&buf[length], type); 1050 1051 /* 1052 * SBC only allows us to enable FUA and DPO together. Fortunately 1053 * DPO is explicitly specified as a hint, so a noop is a perfectly 1054 * valid implementation. 1055 */ 1056 if (target_check_fua(dev)) 1057 spc_modesense_dpofua(&buf[length], type); 1058 1059 ++length; 1060 1061 /* BLOCK DESCRIPTOR */ 1062 1063 /* 1064 * For now we only include a block descriptor for disk (SBC) 1065 * devices; other command sets use a slightly different format. 1066 */ 1067 if (!dbd && type == TYPE_DISK) { 1068 u64 blocks = dev->transport->get_blocks(dev); 1069 u32 block_size = dev->dev_attrib.block_size; 1070 1071 if (ten) { 1072 if (llba) { 1073 length += spc_modesense_long_blockdesc(&buf[length], 1074 blocks, block_size); 1075 } else { 1076 length += 3; 1077 length += spc_modesense_blockdesc(&buf[length], 1078 blocks, block_size); 1079 } 1080 } else { 1081 length += spc_modesense_blockdesc(&buf[length], blocks, 1082 block_size); 1083 } 1084 } else { 1085 if (ten) 1086 length += 4; 1087 else 1088 length += 1; 1089 } 1090 1091 if (page == 0x3f) { 1092 if (subpage != 0x00 && subpage != 0xff) { 1093 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1094 return TCM_INVALID_CDB_FIELD; 1095 } 1096 1097 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1098 /* 1099 * Tricky way to say all subpage 00h for 1100 * subpage==0, all subpages for subpage==0xff 1101 * (and we just checked above that those are 1102 * the only two possibilities). 1103 */ 1104 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1105 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1106 if (!ten && length + ret >= 255) 1107 break; 1108 length += ret; 1109 } 1110 } 1111 1112 goto set_length; 1113 } 1114 1115 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1116 if (modesense_handlers[i].page == page && 1117 modesense_handlers[i].subpage == subpage) { 1118 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1119 goto set_length; 1120 } 1121 1122 /* 1123 * We don't intend to implement: 1124 * - obsolete page 03h "format parameters" (checked by Solaris) 1125 */ 1126 if (page != 0x03) 1127 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1128 page, subpage); 1129 1130 return TCM_UNKNOWN_MODE_PAGE; 1131 1132 set_length: 1133 if (ten) 1134 put_unaligned_be16(length - 2, buf); 1135 else 1136 buf[0] = length - 1; 1137 1138 rbuf = transport_kmap_data_sg(cmd); 1139 if (rbuf) { 1140 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1141 transport_kunmap_data_sg(cmd); 1142 } 1143 1144 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, length); 1145 return 0; 1146 } 1147 1148 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1149 { 1150 char *cdb = cmd->t_task_cdb; 1151 bool ten = cdb[0] == MODE_SELECT_10; 1152 int off = ten ? 8 : 4; 1153 bool pf = !!(cdb[1] & 0x10); 1154 u8 page, subpage; 1155 unsigned char *buf; 1156 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1157 int length; 1158 sense_reason_t ret = 0; 1159 int i; 1160 1161 if (!cmd->data_length) { 1162 target_complete_cmd(cmd, SAM_STAT_GOOD); 1163 return 0; 1164 } 1165 1166 if (cmd->data_length < off + 2) 1167 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1168 1169 buf = transport_kmap_data_sg(cmd); 1170 if (!buf) 1171 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1172 1173 if (!pf) { 1174 ret = TCM_INVALID_CDB_FIELD; 1175 goto out; 1176 } 1177 1178 page = buf[off] & 0x3f; 1179 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1180 1181 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1182 if (modesense_handlers[i].page == page && 1183 modesense_handlers[i].subpage == subpage) { 1184 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1185 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1186 goto check_contents; 1187 } 1188 1189 ret = TCM_UNKNOWN_MODE_PAGE; 1190 goto out; 1191 1192 check_contents: 1193 if (cmd->data_length < off + length) { 1194 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1195 goto out; 1196 } 1197 1198 if (memcmp(buf + off, tbuf, length)) 1199 ret = TCM_INVALID_PARAMETER_LIST; 1200 1201 out: 1202 transport_kunmap_data_sg(cmd); 1203 1204 if (!ret) 1205 target_complete_cmd(cmd, SAM_STAT_GOOD); 1206 return ret; 1207 } 1208 1209 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1210 { 1211 unsigned char *cdb = cmd->t_task_cdb; 1212 unsigned char *rbuf; 1213 u8 ua_asc = 0, ua_ascq = 0; 1214 unsigned char buf[SE_SENSE_BUF]; 1215 bool desc_format = target_sense_desc_format(cmd->se_dev); 1216 1217 memset(buf, 0, SE_SENSE_BUF); 1218 1219 if (cdb[1] & 0x01) { 1220 pr_err("REQUEST_SENSE description emulation not" 1221 " supported\n"); 1222 return TCM_INVALID_CDB_FIELD; 1223 } 1224 1225 rbuf = transport_kmap_data_sg(cmd); 1226 if (!rbuf) 1227 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1228 1229 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1230 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1231 ua_asc, ua_ascq); 1232 else 1233 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1234 1235 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1236 transport_kunmap_data_sg(cmd); 1237 1238 target_complete_cmd(cmd, SAM_STAT_GOOD); 1239 return 0; 1240 } 1241 1242 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1243 { 1244 struct se_dev_entry *deve; 1245 struct se_session *sess = cmd->se_sess; 1246 struct se_node_acl *nacl; 1247 struct scsi_lun slun; 1248 unsigned char *buf; 1249 u32 lun_count = 0, offset = 8; 1250 __be32 len; 1251 1252 buf = transport_kmap_data_sg(cmd); 1253 if (cmd->data_length && !buf) 1254 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1255 1256 /* 1257 * If no struct se_session pointer is present, this struct se_cmd is 1258 * coming via a target_core_mod PASSTHROUGH op, and not through 1259 * a $FABRIC_MOD. In that case, report LUN=0 only. 1260 */ 1261 if (!sess) 1262 goto done; 1263 1264 nacl = sess->se_node_acl; 1265 1266 rcu_read_lock(); 1267 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1268 /* 1269 * We determine the correct LUN LIST LENGTH even once we 1270 * have reached the initial allocation length. 1271 * See SPC2-R20 7.19. 1272 */ 1273 lun_count++; 1274 if (offset >= cmd->data_length) 1275 continue; 1276 1277 int_to_scsilun(deve->mapped_lun, &slun); 1278 memcpy(buf + offset, &slun, 1279 min(8u, cmd->data_length - offset)); 1280 offset += 8; 1281 } 1282 rcu_read_unlock(); 1283 1284 /* 1285 * See SPC3 r07, page 159. 1286 */ 1287 done: 1288 /* 1289 * If no LUNs are accessible, report virtual LUN 0. 1290 */ 1291 if (lun_count == 0) { 1292 int_to_scsilun(0, &slun); 1293 if (cmd->data_length > 8) 1294 memcpy(buf + offset, &slun, 1295 min(8u, cmd->data_length - offset)); 1296 lun_count = 1; 1297 } 1298 1299 if (buf) { 1300 len = cpu_to_be32(lun_count * 8); 1301 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1302 transport_kunmap_data_sg(cmd); 1303 } 1304 1305 target_complete_cmd_with_length(cmd, SAM_STAT_GOOD, 8 + lun_count * 8); 1306 return 0; 1307 } 1308 EXPORT_SYMBOL(spc_emulate_report_luns); 1309 1310 static sense_reason_t 1311 spc_emulate_testunitready(struct se_cmd *cmd) 1312 { 1313 target_complete_cmd(cmd, SAM_STAT_GOOD); 1314 return 0; 1315 } 1316 1317 sense_reason_t 1318 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1319 { 1320 struct se_device *dev = cmd->se_dev; 1321 unsigned char *cdb = cmd->t_task_cdb; 1322 1323 if (!dev->dev_attrib.emulate_pr && 1324 ((cdb[0] == PERSISTENT_RESERVE_IN) || 1325 (cdb[0] == PERSISTENT_RESERVE_OUT) || 1326 (cdb[0] == RELEASE || cdb[0] == RELEASE_10) || 1327 (cdb[0] == RESERVE || cdb[0] == RESERVE_10))) { 1328 return TCM_UNSUPPORTED_SCSI_OPCODE; 1329 } 1330 1331 switch (cdb[0]) { 1332 case MODE_SELECT: 1333 *size = cdb[4]; 1334 cmd->execute_cmd = spc_emulate_modeselect; 1335 break; 1336 case MODE_SELECT_10: 1337 *size = get_unaligned_be16(&cdb[7]); 1338 cmd->execute_cmd = spc_emulate_modeselect; 1339 break; 1340 case MODE_SENSE: 1341 *size = cdb[4]; 1342 cmd->execute_cmd = spc_emulate_modesense; 1343 break; 1344 case MODE_SENSE_10: 1345 *size = get_unaligned_be16(&cdb[7]); 1346 cmd->execute_cmd = spc_emulate_modesense; 1347 break; 1348 case LOG_SELECT: 1349 case LOG_SENSE: 1350 *size = get_unaligned_be16(&cdb[7]); 1351 break; 1352 case PERSISTENT_RESERVE_IN: 1353 *size = get_unaligned_be16(&cdb[7]); 1354 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1355 break; 1356 case PERSISTENT_RESERVE_OUT: 1357 *size = get_unaligned_be32(&cdb[5]); 1358 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1359 break; 1360 case RELEASE: 1361 case RELEASE_10: 1362 if (cdb[0] == RELEASE_10) 1363 *size = get_unaligned_be16(&cdb[7]); 1364 else 1365 *size = cmd->data_length; 1366 1367 cmd->execute_cmd = target_scsi2_reservation_release; 1368 break; 1369 case RESERVE: 1370 case RESERVE_10: 1371 /* 1372 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1373 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1374 */ 1375 if (cdb[0] == RESERVE_10) 1376 *size = get_unaligned_be16(&cdb[7]); 1377 else 1378 *size = cmd->data_length; 1379 1380 cmd->execute_cmd = target_scsi2_reservation_reserve; 1381 break; 1382 case REQUEST_SENSE: 1383 *size = cdb[4]; 1384 cmd->execute_cmd = spc_emulate_request_sense; 1385 break; 1386 case INQUIRY: 1387 *size = get_unaligned_be16(&cdb[3]); 1388 1389 /* 1390 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1391 * See spc4r17 section 5.3 1392 */ 1393 cmd->sam_task_attr = TCM_HEAD_TAG; 1394 cmd->execute_cmd = spc_emulate_inquiry; 1395 break; 1396 case SECURITY_PROTOCOL_IN: 1397 case SECURITY_PROTOCOL_OUT: 1398 *size = get_unaligned_be32(&cdb[6]); 1399 break; 1400 case EXTENDED_COPY: 1401 *size = get_unaligned_be32(&cdb[10]); 1402 cmd->execute_cmd = target_do_xcopy; 1403 break; 1404 case RECEIVE_COPY_RESULTS: 1405 *size = get_unaligned_be32(&cdb[10]); 1406 cmd->execute_cmd = target_do_receive_copy_results; 1407 break; 1408 case READ_ATTRIBUTE: 1409 case WRITE_ATTRIBUTE: 1410 *size = get_unaligned_be32(&cdb[10]); 1411 break; 1412 case RECEIVE_DIAGNOSTIC: 1413 case SEND_DIAGNOSTIC: 1414 *size = get_unaligned_be16(&cdb[3]); 1415 break; 1416 case WRITE_BUFFER: 1417 *size = get_unaligned_be24(&cdb[6]); 1418 break; 1419 case REPORT_LUNS: 1420 cmd->execute_cmd = spc_emulate_report_luns; 1421 *size = get_unaligned_be32(&cdb[6]); 1422 /* 1423 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1424 * See spc4r17 section 5.3 1425 */ 1426 cmd->sam_task_attr = TCM_HEAD_TAG; 1427 break; 1428 case TEST_UNIT_READY: 1429 cmd->execute_cmd = spc_emulate_testunitready; 1430 *size = 0; 1431 break; 1432 case MAINTENANCE_IN: 1433 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1434 /* 1435 * MAINTENANCE_IN from SCC-2 1436 * Check for emulated MI_REPORT_TARGET_PGS 1437 */ 1438 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1439 cmd->execute_cmd = 1440 target_emulate_report_target_port_groups; 1441 } 1442 *size = get_unaligned_be32(&cdb[6]); 1443 } else { 1444 /* 1445 * GPCMD_SEND_KEY from multi media commands 1446 */ 1447 *size = get_unaligned_be16(&cdb[8]); 1448 } 1449 break; 1450 case MAINTENANCE_OUT: 1451 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1452 /* 1453 * MAINTENANCE_OUT from SCC-2 1454 * Check for emulated MO_SET_TARGET_PGS. 1455 */ 1456 if (cdb[1] == MO_SET_TARGET_PGS) { 1457 cmd->execute_cmd = 1458 target_emulate_set_target_port_groups; 1459 } 1460 *size = get_unaligned_be32(&cdb[6]); 1461 } else { 1462 /* 1463 * GPCMD_SEND_KEY from multi media commands 1464 */ 1465 *size = get_unaligned_be16(&cdb[8]); 1466 } 1467 break; 1468 default: 1469 return TCM_UNSUPPORTED_SCSI_OPCODE; 1470 } 1471 1472 return 0; 1473 } 1474 EXPORT_SYMBOL(spc_parse_cdb); 1475