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