1 /* 2 * SCSI Primary Commands (SPC) parsing and emulation. 3 * 4 * (c) Copyright 2002-2013 Datera, Inc. 5 * 6 * Nicholas A. Bellinger <nab@kernel.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21 */ 22 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <asm/unaligned.h> 26 27 #include <scsi/scsi_proto.h> 28 #include <scsi/scsi_common.h> 29 #include <scsi/scsi_tcq.h> 30 31 #include <target/target_core_base.h> 32 #include <target/target_core_backend.h> 33 #include <target/target_core_fabric.h> 34 35 #include "target_core_internal.h" 36 #include "target_core_alua.h" 37 #include "target_core_pr.h" 38 #include "target_core_ua.h" 39 #include "target_core_xcopy.h" 40 41 static void spc_fill_alua_data(struct se_lun *lun, unsigned char *buf) 42 { 43 struct t10_alua_tg_pt_gp *tg_pt_gp; 44 45 /* 46 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. 47 */ 48 buf[5] = 0x80; 49 50 /* 51 * Set TPGS field for explicit and/or implicit ALUA access type 52 * and opteration. 53 * 54 * See spc4r17 section 6.4.2 Table 135 55 */ 56 spin_lock(&lun->lun_tg_pt_gp_lock); 57 tg_pt_gp = lun->lun_tg_pt_gp; 58 if (tg_pt_gp) 59 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; 60 spin_unlock(&lun->lun_tg_pt_gp_lock); 61 } 62 63 sense_reason_t 64 spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf) 65 { 66 struct se_lun *lun = cmd->se_lun; 67 struct se_device *dev = cmd->se_dev; 68 struct se_session *sess = cmd->se_sess; 69 70 /* Set RMB (removable media) for tape devices */ 71 if (dev->transport->get_device_type(dev) == TYPE_TAPE) 72 buf[1] = 0x80; 73 74 buf[2] = 0x05; /* SPC-3 */ 75 76 /* 77 * NORMACA and HISUP = 0, RESPONSE DATA FORMAT = 2 78 * 79 * SPC4 says: 80 * A RESPONSE DATA FORMAT field set to 2h indicates that the 81 * standard INQUIRY data is in the format defined in this 82 * standard. Response data format values less than 2h are 83 * obsolete. Response data format values greater than 2h are 84 * reserved. 85 */ 86 buf[3] = 2; 87 88 /* 89 * Enable SCCS and TPGS fields for Emulated ALUA 90 */ 91 spc_fill_alua_data(lun, buf); 92 93 /* 94 * Set Third-Party Copy (3PC) bit to indicate support for EXTENDED_COPY 95 */ 96 if (dev->dev_attrib.emulate_3pc) 97 buf[5] |= 0x8; 98 /* 99 * Set Protection (PROTECT) bit when DIF has been enabled on the 100 * device, and the fabric supports VERIFY + PASS. Also report 101 * PROTECT=1 if sess_prot_type has been configured to allow T10-PI 102 * to unprotected devices. 103 */ 104 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 105 if (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type) 106 buf[5] |= 0x1; 107 } 108 109 buf[7] = 0x2; /* CmdQue=1 */ 110 111 memcpy(&buf[8], "LIO-ORG ", 8); 112 memset(&buf[16], 0x20, 16); 113 memcpy(&buf[16], dev->t10_wwn.model, 114 min_t(size_t, strlen(dev->t10_wwn.model), 16)); 115 memcpy(&buf[32], dev->t10_wwn.revision, 116 min_t(size_t, strlen(dev->t10_wwn.revision), 4)); 117 buf[4] = 31; /* Set additional length to 31 */ 118 119 return 0; 120 } 121 EXPORT_SYMBOL(spc_emulate_inquiry_std); 122 123 /* unit serial number */ 124 static sense_reason_t 125 spc_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) 126 { 127 struct se_device *dev = cmd->se_dev; 128 u16 len; 129 130 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 131 len = sprintf(&buf[4], "%s", dev->t10_wwn.unit_serial); 132 len++; /* Extra Byte for NULL Terminator */ 133 buf[3] = len; 134 } 135 return 0; 136 } 137 138 void spc_parse_naa_6h_vendor_specific(struct se_device *dev, 139 unsigned char *buf) 140 { 141 unsigned char *p = &dev->t10_wwn.unit_serial[0]; 142 int cnt; 143 bool next = true; 144 145 /* 146 * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on 147 * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field 148 * format, followed by 64 bits of VENDOR SPECIFIC IDENTIFIER EXTENSION 149 * to complete the payload. These are based from VPD=0x80 PRODUCT SERIAL 150 * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure 151 * per device uniqeness. 152 */ 153 for (cnt = 0; *p && cnt < 13; p++) { 154 int val = hex_to_bin(*p); 155 156 if (val < 0) 157 continue; 158 159 if (next) { 160 next = false; 161 buf[cnt++] |= val; 162 } else { 163 next = true; 164 buf[cnt] = val << 4; 165 } 166 } 167 } 168 169 /* 170 * Device identification VPD, for a complete list of 171 * DESIGNATOR TYPEs see spc4r17 Table 459. 172 */ 173 sense_reason_t 174 spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) 175 { 176 struct se_device *dev = cmd->se_dev; 177 struct se_lun *lun = cmd->se_lun; 178 struct se_portal_group *tpg = NULL; 179 struct t10_alua_lu_gp_member *lu_gp_mem; 180 struct t10_alua_tg_pt_gp *tg_pt_gp; 181 unsigned char *prod = &dev->t10_wwn.model[0]; 182 u32 prod_len; 183 u32 unit_serial_len, off = 0; 184 u16 len = 0, id_len; 185 186 off = 4; 187 188 /* 189 * NAA IEEE Registered Extended Assigned designator format, see 190 * spc4r17 section 7.7.3.6.5 191 * 192 * We depend upon a target_core_mod/ConfigFS provided 193 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial 194 * value in order to return the NAA id. 195 */ 196 if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)) 197 goto check_t10_vend_desc; 198 199 /* CODE SET == Binary */ 200 buf[off++] = 0x1; 201 202 /* Set ASSOCIATION == addressed logical unit: 0)b */ 203 buf[off] = 0x00; 204 205 /* Identifier/Designator type == NAA identifier */ 206 buf[off++] |= 0x3; 207 off++; 208 209 /* Identifier/Designator length */ 210 buf[off++] = 0x10; 211 212 /* 213 * Start NAA IEEE Registered Extended Identifier/Designator 214 */ 215 buf[off++] = (0x6 << 4); 216 217 /* 218 * Use OpenFabrics IEEE Company ID: 00 14 05 219 */ 220 buf[off++] = 0x01; 221 buf[off++] = 0x40; 222 buf[off] = (0x5 << 4); 223 224 /* 225 * Return ConfigFS Unit Serial Number information for 226 * VENDOR_SPECIFIC_IDENTIFIER and 227 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION 228 */ 229 spc_parse_naa_6h_vendor_specific(dev, &buf[off]); 230 231 len = 20; 232 off = (len + 4); 233 234 check_t10_vend_desc: 235 /* 236 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 237 */ 238 id_len = 8; /* For Vendor field */ 239 prod_len = 4; /* For VPD Header */ 240 prod_len += 8; /* For Vendor field */ 241 prod_len += strlen(prod); 242 prod_len++; /* For : */ 243 244 if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 245 unit_serial_len = strlen(&dev->t10_wwn.unit_serial[0]); 246 unit_serial_len++; /* For NULL Terminator */ 247 248 id_len += sprintf(&buf[off+12], "%s:%s", prod, 249 &dev->t10_wwn.unit_serial[0]); 250 } 251 buf[off] = 0x2; /* ASCII */ 252 buf[off+1] = 0x1; /* T10 Vendor ID */ 253 buf[off+2] = 0x0; 254 memcpy(&buf[off+4], "LIO-ORG", 8); 255 /* Extra Byte for NULL Terminator */ 256 id_len++; 257 /* Identifier Length */ 258 buf[off+3] = id_len; 259 /* Header size for Designation descriptor */ 260 len += (id_len + 4); 261 off += (id_len + 4); 262 263 if (1) { 264 struct t10_alua_lu_gp *lu_gp; 265 u32 padding, scsi_name_len, scsi_target_len; 266 u16 lu_gp_id = 0; 267 u16 tg_pt_gp_id = 0; 268 u16 tpgt; 269 270 tpg = lun->lun_tpg; 271 /* 272 * Relative target port identifer, see spc4r17 273 * section 7.7.3.7 274 * 275 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 276 * section 7.5.1 Table 362 277 */ 278 buf[off] = tpg->proto_id << 4; 279 buf[off++] |= 0x1; /* CODE SET == Binary */ 280 buf[off] = 0x80; /* Set PIV=1 */ 281 /* Set ASSOCIATION == target port: 01b */ 282 buf[off] |= 0x10; 283 /* DESIGNATOR TYPE == Relative target port identifer */ 284 buf[off++] |= 0x4; 285 off++; /* Skip over Reserved */ 286 buf[off++] = 4; /* DESIGNATOR LENGTH */ 287 /* Skip over Obsolete field in RTPI payload 288 * in Table 472 */ 289 off += 2; 290 put_unaligned_be16(lun->lun_rtpi, &buf[off]); 291 off += 2; 292 len += 8; /* Header size + Designation descriptor */ 293 /* 294 * Target port group identifier, see spc4r17 295 * section 7.7.3.8 296 * 297 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 298 * section 7.5.1 Table 362 299 */ 300 spin_lock(&lun->lun_tg_pt_gp_lock); 301 tg_pt_gp = lun->lun_tg_pt_gp; 302 if (!tg_pt_gp) { 303 spin_unlock(&lun->lun_tg_pt_gp_lock); 304 goto check_lu_gp; 305 } 306 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 307 spin_unlock(&lun->lun_tg_pt_gp_lock); 308 309 buf[off] = tpg->proto_id << 4; 310 buf[off++] |= 0x1; /* CODE SET == Binary */ 311 buf[off] = 0x80; /* Set PIV=1 */ 312 /* Set ASSOCIATION == target port: 01b */ 313 buf[off] |= 0x10; 314 /* DESIGNATOR TYPE == Target port group identifier */ 315 buf[off++] |= 0x5; 316 off++; /* Skip over Reserved */ 317 buf[off++] = 4; /* DESIGNATOR LENGTH */ 318 off += 2; /* Skip over Reserved Field */ 319 put_unaligned_be16(tg_pt_gp_id, &buf[off]); 320 off += 2; 321 len += 8; /* Header size + Designation descriptor */ 322 /* 323 * Logical Unit Group identifier, see spc4r17 324 * section 7.7.3.8 325 */ 326 check_lu_gp: 327 lu_gp_mem = dev->dev_alua_lu_gp_mem; 328 if (!lu_gp_mem) 329 goto check_scsi_name; 330 331 spin_lock(&lu_gp_mem->lu_gp_mem_lock); 332 lu_gp = lu_gp_mem->lu_gp; 333 if (!lu_gp) { 334 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 335 goto check_scsi_name; 336 } 337 lu_gp_id = lu_gp->lu_gp_id; 338 spin_unlock(&lu_gp_mem->lu_gp_mem_lock); 339 340 buf[off++] |= 0x1; /* CODE SET == Binary */ 341 /* DESIGNATOR TYPE == Logical Unit Group identifier */ 342 buf[off++] |= 0x6; 343 off++; /* Skip over Reserved */ 344 buf[off++] = 4; /* DESIGNATOR LENGTH */ 345 off += 2; /* Skip over Reserved Field */ 346 put_unaligned_be16(lu_gp_id, &buf[off]); 347 off += 2; 348 len += 8; /* Header size + Designation descriptor */ 349 /* 350 * SCSI name string designator, see spc4r17 351 * section 7.7.3.11 352 * 353 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 354 * section 7.5.1 Table 362 355 */ 356 check_scsi_name: 357 buf[off] = tpg->proto_id << 4; 358 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 359 buf[off] = 0x80; /* Set PIV=1 */ 360 /* Set ASSOCIATION == target port: 01b */ 361 buf[off] |= 0x10; 362 /* DESIGNATOR TYPE == SCSI name string */ 363 buf[off++] |= 0x8; 364 off += 2; /* Skip over Reserved and length */ 365 /* 366 * SCSI name string identifer containing, $FABRIC_MOD 367 * dependent information. For LIO-Target and iSCSI 368 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in 369 * UTF-8 encoding. 370 */ 371 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 372 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", 373 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); 374 scsi_name_len += 1 /* Include NULL terminator */; 375 /* 376 * The null-terminated, null-padded (see 4.4.2) SCSI 377 * NAME STRING field contains a UTF-8 format string. 378 * The number of bytes in the SCSI NAME STRING field 379 * (i.e., the value in the DESIGNATOR LENGTH field) 380 * shall be no larger than 256 and shall be a multiple 381 * of four. 382 */ 383 padding = ((-scsi_name_len) & 3); 384 if (padding) 385 scsi_name_len += padding; 386 if (scsi_name_len > 256) 387 scsi_name_len = 256; 388 389 buf[off-1] = scsi_name_len; 390 off += scsi_name_len; 391 /* Header size + Designation descriptor */ 392 len += (scsi_name_len + 4); 393 394 /* 395 * Target device designator 396 */ 397 buf[off] = tpg->proto_id << 4; 398 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 399 buf[off] = 0x80; /* Set PIV=1 */ 400 /* Set ASSOCIATION == target device: 10b */ 401 buf[off] |= 0x20; 402 /* DESIGNATOR TYPE == SCSI name string */ 403 buf[off++] |= 0x8; 404 off += 2; /* Skip over Reserved and length */ 405 /* 406 * SCSI name string identifer containing, $FABRIC_MOD 407 * dependent information. For LIO-Target and iSCSI 408 * Target Port, this means "<iSCSI name>" in 409 * UTF-8 encoding. 410 */ 411 scsi_target_len = sprintf(&buf[off], "%s", 412 tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 413 scsi_target_len += 1 /* Include NULL terminator */; 414 /* 415 * The null-terminated, null-padded (see 4.4.2) SCSI 416 * NAME STRING field contains a UTF-8 format string. 417 * The number of bytes in the SCSI NAME STRING field 418 * (i.e., the value in the DESIGNATOR LENGTH field) 419 * shall be no larger than 256 and shall be a multiple 420 * of four. 421 */ 422 padding = ((-scsi_target_len) & 3); 423 if (padding) 424 scsi_target_len += padding; 425 if (scsi_target_len > 256) 426 scsi_target_len = 256; 427 428 buf[off-1] = scsi_target_len; 429 off += scsi_target_len; 430 431 /* Header size + Designation descriptor */ 432 len += (scsi_target_len + 4); 433 } 434 put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */ 435 return 0; 436 } 437 EXPORT_SYMBOL(spc_emulate_evpd_83); 438 439 /* Extended INQUIRY Data VPD Page */ 440 static sense_reason_t 441 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) 442 { 443 struct se_device *dev = cmd->se_dev; 444 struct se_session *sess = cmd->se_sess; 445 446 buf[3] = 0x3c; 447 /* 448 * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK 449 * only for TYPE3 protection. 450 */ 451 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 452 if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT || 453 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE1_PROT) 454 buf[4] = 0x5; 455 else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT || 456 cmd->se_sess->sess_prot_type == TARGET_DIF_TYPE3_PROT) 457 buf[4] = 0x4; 458 } 459 460 /* logical unit supports type 1 and type 3 protection */ 461 if ((dev->transport->get_device_type(dev) == TYPE_DISK) && 462 (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) && 463 (dev->dev_attrib.pi_prot_type || cmd->se_sess->sess_prot_type)) { 464 buf[4] |= (0x3 << 3); 465 } 466 467 /* Set HEADSUP, ORDSUP, SIMPSUP */ 468 buf[5] = 0x07; 469 470 /* If WriteCache emulation is enabled, set V_SUP */ 471 if (target_check_wce(dev)) 472 buf[6] = 0x01; 473 /* If an LBA map is present set R_SUP */ 474 spin_lock(&cmd->se_dev->t10_alua.lba_map_lock); 475 if (!list_empty(&dev->t10_alua.lba_map_list)) 476 buf[8] = 0x10; 477 spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock); 478 return 0; 479 } 480 481 /* Block Limits VPD page */ 482 static sense_reason_t 483 spc_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) 484 { 485 struct se_device *dev = cmd->se_dev; 486 u32 mtl = 0; 487 int have_tp = 0, opt, min; 488 489 /* 490 * Following spc3r22 section 6.5.3 Block Limits VPD page, when 491 * emulate_tpu=1 or emulate_tpws=1 we will be expect a 492 * different page length for Thin Provisioning. 493 */ 494 if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 495 have_tp = 1; 496 497 buf[0] = dev->transport->get_device_type(dev); 498 buf[3] = have_tp ? 0x3c : 0x10; 499 500 /* Set WSNZ to 1 */ 501 buf[4] = 0x01; 502 /* 503 * Set MAXIMUM COMPARE AND WRITE LENGTH 504 */ 505 if (dev->dev_attrib.emulate_caw) 506 buf[5] = 0x01; 507 508 /* 509 * Set OPTIMAL TRANSFER LENGTH GRANULARITY 510 */ 511 if (dev->transport->get_io_min && (min = dev->transport->get_io_min(dev))) 512 put_unaligned_be16(min / dev->dev_attrib.block_size, &buf[6]); 513 else 514 put_unaligned_be16(1, &buf[6]); 515 516 /* 517 * Set MAXIMUM TRANSFER LENGTH 518 * 519 * XXX: Currently assumes single PAGE_SIZE per scatterlist for fabrics 520 * enforcing maximum HW scatter-gather-list entry limit 521 */ 522 if (cmd->se_tfo->max_data_sg_nents) { 523 mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE) / 524 dev->dev_attrib.block_size; 525 } 526 put_unaligned_be32(min_not_zero(mtl, dev->dev_attrib.hw_max_sectors), &buf[8]); 527 528 /* 529 * Set OPTIMAL TRANSFER LENGTH 530 */ 531 if (dev->transport->get_io_opt && (opt = dev->transport->get_io_opt(dev))) 532 put_unaligned_be32(opt / dev->dev_attrib.block_size, &buf[12]); 533 else 534 put_unaligned_be32(dev->dev_attrib.optimal_sectors, &buf[12]); 535 536 /* 537 * Exit now if we don't support TP. 538 */ 539 if (!have_tp) 540 goto max_write_same; 541 542 /* 543 * Set MAXIMUM UNMAP LBA COUNT 544 */ 545 put_unaligned_be32(dev->dev_attrib.max_unmap_lba_count, &buf[20]); 546 547 /* 548 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT 549 */ 550 put_unaligned_be32(dev->dev_attrib.max_unmap_block_desc_count, 551 &buf[24]); 552 553 /* 554 * Set OPTIMAL UNMAP GRANULARITY 555 */ 556 put_unaligned_be32(dev->dev_attrib.unmap_granularity, &buf[28]); 557 558 /* 559 * UNMAP GRANULARITY ALIGNMENT 560 */ 561 put_unaligned_be32(dev->dev_attrib.unmap_granularity_alignment, 562 &buf[32]); 563 if (dev->dev_attrib.unmap_granularity_alignment != 0) 564 buf[32] |= 0x80; /* Set the UGAVALID bit */ 565 566 /* 567 * MAXIMUM WRITE SAME LENGTH 568 */ 569 max_write_same: 570 put_unaligned_be64(dev->dev_attrib.max_write_same_len, &buf[36]); 571 572 return 0; 573 } 574 575 /* Block Device Characteristics VPD page */ 576 static sense_reason_t 577 spc_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) 578 { 579 struct se_device *dev = cmd->se_dev; 580 581 buf[0] = dev->transport->get_device_type(dev); 582 buf[3] = 0x3c; 583 buf[5] = dev->dev_attrib.is_nonrot ? 1 : 0; 584 585 return 0; 586 } 587 588 /* Thin Provisioning VPD */ 589 static sense_reason_t 590 spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) 591 { 592 struct se_device *dev = cmd->se_dev; 593 594 /* 595 * From spc3r22 section 6.5.4 Thin Provisioning VPD page: 596 * 597 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to 598 * zero, then the page length shall be set to 0004h. If the DP bit 599 * is set to one, then the page length shall be set to the value 600 * defined in table 162. 601 */ 602 buf[0] = dev->transport->get_device_type(dev); 603 604 /* 605 * Set Hardcoded length mentioned above for DP=0 606 */ 607 put_unaligned_be16(0x0004, &buf[2]); 608 609 /* 610 * The THRESHOLD EXPONENT field indicates the threshold set size in 611 * LBAs as a power of 2 (i.e., the threshold set size is equal to 612 * 2(threshold exponent)). 613 * 614 * Note that this is currently set to 0x00 as mkp says it will be 615 * changing again. We can enable this once it has settled in T10 616 * and is actually used by Linux/SCSI ML code. 617 */ 618 buf[4] = 0x00; 619 620 /* 621 * A TPU bit set to one indicates that the device server supports 622 * the UNMAP command (see 5.25). A TPU bit set to zero indicates 623 * that the device server does not support the UNMAP command. 624 */ 625 if (dev->dev_attrib.emulate_tpu != 0) 626 buf[5] = 0x80; 627 628 /* 629 * A TPWS bit set to one indicates that the device server supports 630 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. 631 * A TPWS bit set to zero indicates that the device server does not 632 * support the use of the WRITE SAME (16) command to unmap LBAs. 633 */ 634 if (dev->dev_attrib.emulate_tpws != 0) 635 buf[5] |= 0x40 | 0x20; 636 637 /* 638 * The unmap_zeroes_data set means that the underlying device supports 639 * REQ_OP_DISCARD and has the discard_zeroes_data bit set. This 640 * satisfies the SBC requirements for LBPRZ, meaning that a subsequent 641 * read will return zeroes after an UNMAP or WRITE SAME (16) to an LBA 642 * See sbc4r36 6.6.4. 643 */ 644 if (((dev->dev_attrib.emulate_tpu != 0) || 645 (dev->dev_attrib.emulate_tpws != 0)) && 646 (dev->dev_attrib.unmap_zeroes_data != 0)) 647 buf[5] |= 0x04; 648 649 return 0; 650 } 651 652 /* Referrals VPD page */ 653 static sense_reason_t 654 spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf) 655 { 656 struct se_device *dev = cmd->se_dev; 657 658 buf[0] = dev->transport->get_device_type(dev); 659 buf[3] = 0x0c; 660 put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]); 661 put_unaligned_be32(dev->t10_alua.lba_map_segment_multiplier, &buf[12]); 662 663 return 0; 664 } 665 666 static sense_reason_t 667 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); 668 669 static struct { 670 uint8_t page; 671 sense_reason_t (*emulate)(struct se_cmd *, unsigned char *); 672 } evpd_handlers[] = { 673 { .page = 0x00, .emulate = spc_emulate_evpd_00 }, 674 { .page = 0x80, .emulate = spc_emulate_evpd_80 }, 675 { .page = 0x83, .emulate = spc_emulate_evpd_83 }, 676 { .page = 0x86, .emulate = spc_emulate_evpd_86 }, 677 { .page = 0xb0, .emulate = spc_emulate_evpd_b0 }, 678 { .page = 0xb1, .emulate = spc_emulate_evpd_b1 }, 679 { .page = 0xb2, .emulate = spc_emulate_evpd_b2 }, 680 { .page = 0xb3, .emulate = spc_emulate_evpd_b3 }, 681 }; 682 683 /* supported vital product data pages */ 684 static sense_reason_t 685 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) 686 { 687 int p; 688 689 /* 690 * Only report the INQUIRY EVPD=1 pages after a valid NAA 691 * Registered Extended LUN WWN has been set via ConfigFS 692 * during device creation/restart. 693 */ 694 if (cmd->se_dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL) { 695 buf[3] = ARRAY_SIZE(evpd_handlers); 696 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) 697 buf[p + 4] = evpd_handlers[p].page; 698 } 699 700 return 0; 701 } 702 703 static sense_reason_t 704 spc_emulate_inquiry(struct se_cmd *cmd) 705 { 706 struct se_device *dev = cmd->se_dev; 707 struct se_portal_group *tpg = cmd->se_lun->lun_tpg; 708 unsigned char *rbuf; 709 unsigned char *cdb = cmd->t_task_cdb; 710 unsigned char *buf; 711 sense_reason_t ret; 712 int p; 713 int len = 0; 714 715 buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL); 716 if (!buf) { 717 pr_err("Unable to allocate response buffer for INQUIRY\n"); 718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 719 } 720 721 if (dev == rcu_access_pointer(tpg->tpg_virt_lun0->lun_se_dev)) 722 buf[0] = 0x3f; /* Not connected */ 723 else 724 buf[0] = dev->transport->get_device_type(dev); 725 726 if (!(cdb[1] & 0x1)) { 727 if (cdb[2]) { 728 pr_err("INQUIRY with EVPD==0 but PAGE CODE=%02x\n", 729 cdb[2]); 730 ret = TCM_INVALID_CDB_FIELD; 731 goto out; 732 } 733 734 ret = spc_emulate_inquiry_std(cmd, buf); 735 len = buf[4] + 5; 736 goto out; 737 } 738 739 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) { 740 if (cdb[2] == evpd_handlers[p].page) { 741 buf[1] = cdb[2]; 742 ret = evpd_handlers[p].emulate(cmd, buf); 743 len = get_unaligned_be16(&buf[2]) + 4; 744 goto out; 745 } 746 } 747 748 pr_err("Unknown VPD Code: 0x%02x\n", cdb[2]); 749 ret = TCM_INVALID_CDB_FIELD; 750 751 out: 752 rbuf = transport_kmap_data_sg(cmd); 753 if (rbuf) { 754 memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length)); 755 transport_kunmap_data_sg(cmd); 756 } 757 kfree(buf); 758 759 if (!ret) 760 target_complete_cmd_with_length(cmd, GOOD, len); 761 return ret; 762 } 763 764 static int spc_modesense_rwrecovery(struct se_cmd *cmd, u8 pc, u8 *p) 765 { 766 p[0] = 0x01; 767 p[1] = 0x0a; 768 769 /* No changeable values for now */ 770 if (pc == 1) 771 goto out; 772 773 out: 774 return 12; 775 } 776 777 static int spc_modesense_control(struct se_cmd *cmd, u8 pc, u8 *p) 778 { 779 struct se_device *dev = cmd->se_dev; 780 struct se_session *sess = cmd->se_sess; 781 782 p[0] = 0x0a; 783 p[1] = 0x0a; 784 785 /* No changeable values for now */ 786 if (pc == 1) 787 goto out; 788 789 /* GLTSD: No implicit save of log parameters */ 790 p[2] = (1 << 1); 791 if (target_sense_desc_format(dev)) 792 /* D_SENSE: Descriptor format sense data for 64bit sectors */ 793 p[2] |= (1 << 2); 794 795 /* 796 * From spc4r23, 7.4.7 Control mode page 797 * 798 * The QUEUE ALGORITHM MODIFIER field (see table 368) specifies 799 * restrictions on the algorithm used for reordering commands 800 * having the SIMPLE task attribute (see SAM-4). 801 * 802 * Table 368 -- QUEUE ALGORITHM MODIFIER field 803 * Code Description 804 * 0h Restricted reordering 805 * 1h Unrestricted reordering allowed 806 * 2h to 7h Reserved 807 * 8h to Fh Vendor specific 808 * 809 * A value of zero in the QUEUE ALGORITHM MODIFIER field specifies that 810 * the device server shall order the processing sequence of commands 811 * having the SIMPLE task attribute such that data integrity is maintained 812 * for that I_T nexus (i.e., if the transmission of new SCSI transport protocol 813 * requests is halted at any time, the final value of all data observable 814 * on the medium shall be the same as if all the commands had been processed 815 * with the ORDERED task attribute). 816 * 817 * A value of one in the QUEUE ALGORITHM MODIFIER field specifies that the 818 * device server may reorder the processing sequence of commands having the 819 * SIMPLE task attribute in any manner. Any data integrity exposures related to 820 * command sequence order shall be explicitly handled by the application client 821 * through the selection of appropriate ommands and task attributes. 822 */ 823 p[3] = (dev->dev_attrib.emulate_rest_reord == 1) ? 0x00 : 0x10; 824 /* 825 * From spc4r17, section 7.4.6 Control mode Page 826 * 827 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 828 * 829 * 00b: The logical unit shall clear any unit attention condition 830 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 831 * status and shall not establish a unit attention condition when a com- 832 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 833 * status. 834 * 835 * 10b: The logical unit shall not clear any unit attention condition 836 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 837 * status and shall not establish a unit attention condition when 838 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 839 * CONFLICT status. 840 * 841 * 11b a The logical unit shall not clear any unit attention condition 842 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 843 * status and shall establish a unit attention condition for the 844 * initiator port associated with the I_T nexus on which the BUSY, 845 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 846 * Depending on the status, the additional sense code shall be set to 847 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 848 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 849 * command, a unit attention condition shall be established only once 850 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 851 * to the number of commands completed with one of those status codes. 852 */ 853 p[4] = (dev->dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : 854 (dev->dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00; 855 /* 856 * From spc4r17, section 7.4.6 Control mode Page 857 * 858 * Task Aborted Status (TAS) bit set to zero. 859 * 860 * A task aborted status (TAS) bit set to zero specifies that aborted 861 * tasks shall be terminated by the device server without any response 862 * to the application client. A TAS bit set to one specifies that tasks 863 * aborted by the actions of an I_T nexus other than the I_T nexus on 864 * which the command was received shall be completed with TASK ABORTED 865 * status (see SAM-4). 866 */ 867 p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00; 868 /* 869 * From spc4r30, section 7.5.7 Control mode page 870 * 871 * Application Tag Owner (ATO) bit set to one. 872 * 873 * If the ATO bit is set to one the device server shall not modify the 874 * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection 875 * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE 876 * TAG field. 877 */ 878 if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 879 if (dev->dev_attrib.pi_prot_type || sess->sess_prot_type) 880 p[5] |= 0x80; 881 } 882 883 p[8] = 0xff; 884 p[9] = 0xff; 885 p[11] = 30; 886 887 out: 888 return 12; 889 } 890 891 static int spc_modesense_caching(struct se_cmd *cmd, u8 pc, u8 *p) 892 { 893 struct se_device *dev = cmd->se_dev; 894 895 p[0] = 0x08; 896 p[1] = 0x12; 897 898 /* No changeable values for now */ 899 if (pc == 1) 900 goto out; 901 902 if (target_check_wce(dev)) 903 p[2] = 0x04; /* Write Cache Enable */ 904 p[12] = 0x20; /* Disabled Read Ahead */ 905 906 out: 907 return 20; 908 } 909 910 static int spc_modesense_informational_exceptions(struct se_cmd *cmd, u8 pc, unsigned char *p) 911 { 912 p[0] = 0x1c; 913 p[1] = 0x0a; 914 915 /* No changeable values for now */ 916 if (pc == 1) 917 goto out; 918 919 out: 920 return 12; 921 } 922 923 static struct { 924 uint8_t page; 925 uint8_t subpage; 926 int (*emulate)(struct se_cmd *, u8, unsigned char *); 927 } modesense_handlers[] = { 928 { .page = 0x01, .subpage = 0x00, .emulate = spc_modesense_rwrecovery }, 929 { .page = 0x08, .subpage = 0x00, .emulate = spc_modesense_caching }, 930 { .page = 0x0a, .subpage = 0x00, .emulate = spc_modesense_control }, 931 { .page = 0x1c, .subpage = 0x00, .emulate = spc_modesense_informational_exceptions }, 932 }; 933 934 static void spc_modesense_write_protect(unsigned char *buf, int type) 935 { 936 /* 937 * I believe that the WP bit (bit 7) in the mode header is the same for 938 * all device types.. 939 */ 940 switch (type) { 941 case TYPE_DISK: 942 case TYPE_TAPE: 943 default: 944 buf[0] |= 0x80; /* WP bit */ 945 break; 946 } 947 } 948 949 static void spc_modesense_dpofua(unsigned char *buf, int type) 950 { 951 switch (type) { 952 case TYPE_DISK: 953 buf[0] |= 0x10; /* DPOFUA bit */ 954 break; 955 default: 956 break; 957 } 958 } 959 960 static int spc_modesense_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 961 { 962 *buf++ = 8; 963 put_unaligned_be32(min(blocks, 0xffffffffull), buf); 964 buf += 4; 965 put_unaligned_be32(block_size, buf); 966 return 9; 967 } 968 969 static int spc_modesense_long_blockdesc(unsigned char *buf, u64 blocks, u32 block_size) 970 { 971 if (blocks <= 0xffffffff) 972 return spc_modesense_blockdesc(buf + 3, blocks, block_size) + 3; 973 974 *buf++ = 1; /* LONGLBA */ 975 buf += 2; 976 *buf++ = 16; 977 put_unaligned_be64(blocks, buf); 978 buf += 12; 979 put_unaligned_be32(block_size, buf); 980 981 return 17; 982 } 983 984 static sense_reason_t spc_emulate_modesense(struct se_cmd *cmd) 985 { 986 struct se_device *dev = cmd->se_dev; 987 char *cdb = cmd->t_task_cdb; 988 unsigned char buf[SE_MODE_PAGE_BUF], *rbuf; 989 int type = dev->transport->get_device_type(dev); 990 int ten = (cmd->t_task_cdb[0] == MODE_SENSE_10); 991 bool dbd = !!(cdb[1] & 0x08); 992 bool llba = ten ? !!(cdb[1] & 0x10) : false; 993 u8 pc = cdb[2] >> 6; 994 u8 page = cdb[2] & 0x3f; 995 u8 subpage = cdb[3]; 996 int length = 0; 997 int ret; 998 int i; 999 1000 memset(buf, 0, SE_MODE_PAGE_BUF); 1001 1002 /* 1003 * Skip over MODE DATA LENGTH + MEDIUM TYPE fields to byte 3 for 1004 * MODE_SENSE_10 and byte 2 for MODE_SENSE (6). 1005 */ 1006 length = ten ? 3 : 2; 1007 1008 /* DEVICE-SPECIFIC PARAMETER */ 1009 if (cmd->se_lun->lun_access_ro || target_lun_is_rdonly(cmd)) 1010 spc_modesense_write_protect(&buf[length], type); 1011 1012 /* 1013 * SBC only allows us to enable FUA and DPO together. Fortunately 1014 * DPO is explicitly specified as a hint, so a noop is a perfectly 1015 * valid implementation. 1016 */ 1017 if (target_check_fua(dev)) 1018 spc_modesense_dpofua(&buf[length], type); 1019 1020 ++length; 1021 1022 /* BLOCK DESCRIPTOR */ 1023 1024 /* 1025 * For now we only include a block descriptor for disk (SBC) 1026 * devices; other command sets use a slightly different format. 1027 */ 1028 if (!dbd && type == TYPE_DISK) { 1029 u64 blocks = dev->transport->get_blocks(dev); 1030 u32 block_size = dev->dev_attrib.block_size; 1031 1032 if (ten) { 1033 if (llba) { 1034 length += spc_modesense_long_blockdesc(&buf[length], 1035 blocks, block_size); 1036 } else { 1037 length += 3; 1038 length += spc_modesense_blockdesc(&buf[length], 1039 blocks, block_size); 1040 } 1041 } else { 1042 length += spc_modesense_blockdesc(&buf[length], blocks, 1043 block_size); 1044 } 1045 } else { 1046 if (ten) 1047 length += 4; 1048 else 1049 length += 1; 1050 } 1051 1052 if (page == 0x3f) { 1053 if (subpage != 0x00 && subpage != 0xff) { 1054 pr_warn("MODE_SENSE: Invalid subpage code: 0x%02x\n", subpage); 1055 return TCM_INVALID_CDB_FIELD; 1056 } 1057 1058 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) { 1059 /* 1060 * Tricky way to say all subpage 00h for 1061 * subpage==0, all subpages for subpage==0xff 1062 * (and we just checked above that those are 1063 * the only two possibilities). 1064 */ 1065 if ((modesense_handlers[i].subpage & ~subpage) == 0) { 1066 ret = modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1067 if (!ten && length + ret >= 255) 1068 break; 1069 length += ret; 1070 } 1071 } 1072 1073 goto set_length; 1074 } 1075 1076 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1077 if (modesense_handlers[i].page == page && 1078 modesense_handlers[i].subpage == subpage) { 1079 length += modesense_handlers[i].emulate(cmd, pc, &buf[length]); 1080 goto set_length; 1081 } 1082 1083 /* 1084 * We don't intend to implement: 1085 * - obsolete page 03h "format parameters" (checked by Solaris) 1086 */ 1087 if (page != 0x03) 1088 pr_err("MODE SENSE: unimplemented page/subpage: 0x%02x/0x%02x\n", 1089 page, subpage); 1090 1091 return TCM_UNKNOWN_MODE_PAGE; 1092 1093 set_length: 1094 if (ten) 1095 put_unaligned_be16(length - 2, buf); 1096 else 1097 buf[0] = length - 1; 1098 1099 rbuf = transport_kmap_data_sg(cmd); 1100 if (rbuf) { 1101 memcpy(rbuf, buf, min_t(u32, SE_MODE_PAGE_BUF, cmd->data_length)); 1102 transport_kunmap_data_sg(cmd); 1103 } 1104 1105 target_complete_cmd_with_length(cmd, GOOD, length); 1106 return 0; 1107 } 1108 1109 static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd) 1110 { 1111 char *cdb = cmd->t_task_cdb; 1112 bool ten = cdb[0] == MODE_SELECT_10; 1113 int off = ten ? 8 : 4; 1114 bool pf = !!(cdb[1] & 0x10); 1115 u8 page, subpage; 1116 unsigned char *buf; 1117 unsigned char tbuf[SE_MODE_PAGE_BUF]; 1118 int length; 1119 sense_reason_t ret = 0; 1120 int i; 1121 1122 if (!cmd->data_length) { 1123 target_complete_cmd(cmd, GOOD); 1124 return 0; 1125 } 1126 1127 if (cmd->data_length < off + 2) 1128 return TCM_PARAMETER_LIST_LENGTH_ERROR; 1129 1130 buf = transport_kmap_data_sg(cmd); 1131 if (!buf) 1132 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1133 1134 if (!pf) { 1135 ret = TCM_INVALID_CDB_FIELD; 1136 goto out; 1137 } 1138 1139 page = buf[off] & 0x3f; 1140 subpage = buf[off] & 0x40 ? buf[off + 1] : 0; 1141 1142 for (i = 0; i < ARRAY_SIZE(modesense_handlers); ++i) 1143 if (modesense_handlers[i].page == page && 1144 modesense_handlers[i].subpage == subpage) { 1145 memset(tbuf, 0, SE_MODE_PAGE_BUF); 1146 length = modesense_handlers[i].emulate(cmd, 0, tbuf); 1147 goto check_contents; 1148 } 1149 1150 ret = TCM_UNKNOWN_MODE_PAGE; 1151 goto out; 1152 1153 check_contents: 1154 if (cmd->data_length < off + length) { 1155 ret = TCM_PARAMETER_LIST_LENGTH_ERROR; 1156 goto out; 1157 } 1158 1159 if (memcmp(buf + off, tbuf, length)) 1160 ret = TCM_INVALID_PARAMETER_LIST; 1161 1162 out: 1163 transport_kunmap_data_sg(cmd); 1164 1165 if (!ret) 1166 target_complete_cmd(cmd, GOOD); 1167 return ret; 1168 } 1169 1170 static sense_reason_t spc_emulate_request_sense(struct se_cmd *cmd) 1171 { 1172 unsigned char *cdb = cmd->t_task_cdb; 1173 unsigned char *rbuf; 1174 u8 ua_asc = 0, ua_ascq = 0; 1175 unsigned char buf[SE_SENSE_BUF]; 1176 bool desc_format = target_sense_desc_format(cmd->se_dev); 1177 1178 memset(buf, 0, SE_SENSE_BUF); 1179 1180 if (cdb[1] & 0x01) { 1181 pr_err("REQUEST_SENSE description emulation not" 1182 " supported\n"); 1183 return TCM_INVALID_CDB_FIELD; 1184 } 1185 1186 rbuf = transport_kmap_data_sg(cmd); 1187 if (!rbuf) 1188 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1189 1190 if (!core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq)) 1191 scsi_build_sense_buffer(desc_format, buf, UNIT_ATTENTION, 1192 ua_asc, ua_ascq); 1193 else 1194 scsi_build_sense_buffer(desc_format, buf, NO_SENSE, 0x0, 0x0); 1195 1196 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1197 transport_kunmap_data_sg(cmd); 1198 1199 target_complete_cmd(cmd, GOOD); 1200 return 0; 1201 } 1202 1203 sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 1204 { 1205 struct se_dev_entry *deve; 1206 struct se_session *sess = cmd->se_sess; 1207 struct se_node_acl *nacl; 1208 struct scsi_lun slun; 1209 unsigned char *buf; 1210 u32 lun_count = 0, offset = 8; 1211 __be32 len; 1212 1213 buf = transport_kmap_data_sg(cmd); 1214 if (cmd->data_length && !buf) 1215 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1216 1217 /* 1218 * If no struct se_session pointer is present, this struct se_cmd is 1219 * coming via a target_core_mod PASSTHROUGH op, and not through 1220 * a $FABRIC_MOD. In that case, report LUN=0 only. 1221 */ 1222 if (!sess) 1223 goto done; 1224 1225 nacl = sess->se_node_acl; 1226 1227 rcu_read_lock(); 1228 hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link) { 1229 /* 1230 * We determine the correct LUN LIST LENGTH even once we 1231 * have reached the initial allocation length. 1232 * See SPC2-R20 7.19. 1233 */ 1234 lun_count++; 1235 if (offset >= cmd->data_length) 1236 continue; 1237 1238 int_to_scsilun(deve->mapped_lun, &slun); 1239 memcpy(buf + offset, &slun, 1240 min(8u, cmd->data_length - offset)); 1241 offset += 8; 1242 } 1243 rcu_read_unlock(); 1244 1245 /* 1246 * See SPC3 r07, page 159. 1247 */ 1248 done: 1249 /* 1250 * If no LUNs are accessible, report virtual LUN 0. 1251 */ 1252 if (lun_count == 0) { 1253 int_to_scsilun(0, &slun); 1254 if (cmd->data_length > 8) 1255 memcpy(buf + offset, &slun, 1256 min(8u, cmd->data_length - offset)); 1257 lun_count = 1; 1258 } 1259 1260 if (buf) { 1261 len = cpu_to_be32(lun_count * 8); 1262 memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length)); 1263 transport_kunmap_data_sg(cmd); 1264 } 1265 1266 target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8); 1267 return 0; 1268 } 1269 EXPORT_SYMBOL(spc_emulate_report_luns); 1270 1271 static sense_reason_t 1272 spc_emulate_testunitready(struct se_cmd *cmd) 1273 { 1274 target_complete_cmd(cmd, GOOD); 1275 return 0; 1276 } 1277 1278 sense_reason_t 1279 spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 1280 { 1281 struct se_device *dev = cmd->se_dev; 1282 unsigned char *cdb = cmd->t_task_cdb; 1283 1284 switch (cdb[0]) { 1285 case MODE_SELECT: 1286 *size = cdb[4]; 1287 cmd->execute_cmd = spc_emulate_modeselect; 1288 break; 1289 case MODE_SELECT_10: 1290 *size = get_unaligned_be16(&cdb[7]); 1291 cmd->execute_cmd = spc_emulate_modeselect; 1292 break; 1293 case MODE_SENSE: 1294 *size = cdb[4]; 1295 cmd->execute_cmd = spc_emulate_modesense; 1296 break; 1297 case MODE_SENSE_10: 1298 *size = get_unaligned_be16(&cdb[7]); 1299 cmd->execute_cmd = spc_emulate_modesense; 1300 break; 1301 case LOG_SELECT: 1302 case LOG_SENSE: 1303 *size = get_unaligned_be16(&cdb[7]); 1304 break; 1305 case PERSISTENT_RESERVE_IN: 1306 *size = get_unaligned_be16(&cdb[7]); 1307 cmd->execute_cmd = target_scsi3_emulate_pr_in; 1308 break; 1309 case PERSISTENT_RESERVE_OUT: 1310 *size = get_unaligned_be32(&cdb[5]); 1311 cmd->execute_cmd = target_scsi3_emulate_pr_out; 1312 break; 1313 case RELEASE: 1314 case RELEASE_10: 1315 if (cdb[0] == RELEASE_10) 1316 *size = get_unaligned_be16(&cdb[7]); 1317 else 1318 *size = cmd->data_length; 1319 1320 cmd->execute_cmd = target_scsi2_reservation_release; 1321 break; 1322 case RESERVE: 1323 case RESERVE_10: 1324 /* 1325 * The SPC-2 RESERVE does not contain a size in the SCSI CDB. 1326 * Assume the passthrough or $FABRIC_MOD will tell us about it. 1327 */ 1328 if (cdb[0] == RESERVE_10) 1329 *size = get_unaligned_be16(&cdb[7]); 1330 else 1331 *size = cmd->data_length; 1332 1333 cmd->execute_cmd = target_scsi2_reservation_reserve; 1334 break; 1335 case REQUEST_SENSE: 1336 *size = cdb[4]; 1337 cmd->execute_cmd = spc_emulate_request_sense; 1338 break; 1339 case INQUIRY: 1340 *size = get_unaligned_be16(&cdb[3]); 1341 1342 /* 1343 * Do implicit HEAD_OF_QUEUE processing for INQUIRY. 1344 * See spc4r17 section 5.3 1345 */ 1346 cmd->sam_task_attr = TCM_HEAD_TAG; 1347 cmd->execute_cmd = spc_emulate_inquiry; 1348 break; 1349 case SECURITY_PROTOCOL_IN: 1350 case SECURITY_PROTOCOL_OUT: 1351 *size = get_unaligned_be32(&cdb[6]); 1352 break; 1353 case EXTENDED_COPY: 1354 *size = get_unaligned_be32(&cdb[10]); 1355 cmd->execute_cmd = target_do_xcopy; 1356 break; 1357 case RECEIVE_COPY_RESULTS: 1358 *size = get_unaligned_be32(&cdb[10]); 1359 cmd->execute_cmd = target_do_receive_copy_results; 1360 break; 1361 case READ_ATTRIBUTE: 1362 case WRITE_ATTRIBUTE: 1363 *size = get_unaligned_be32(&cdb[10]); 1364 break; 1365 case RECEIVE_DIAGNOSTIC: 1366 case SEND_DIAGNOSTIC: 1367 *size = get_unaligned_be16(&cdb[3]); 1368 break; 1369 case WRITE_BUFFER: 1370 *size = get_unaligned_be24(&cdb[6]); 1371 break; 1372 case REPORT_LUNS: 1373 cmd->execute_cmd = spc_emulate_report_luns; 1374 *size = get_unaligned_be32(&cdb[6]); 1375 /* 1376 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS 1377 * See spc4r17 section 5.3 1378 */ 1379 cmd->sam_task_attr = TCM_HEAD_TAG; 1380 break; 1381 case TEST_UNIT_READY: 1382 cmd->execute_cmd = spc_emulate_testunitready; 1383 *size = 0; 1384 break; 1385 case MAINTENANCE_IN: 1386 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1387 /* 1388 * MAINTENANCE_IN from SCC-2 1389 * Check for emulated MI_REPORT_TARGET_PGS 1390 */ 1391 if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS) { 1392 cmd->execute_cmd = 1393 target_emulate_report_target_port_groups; 1394 } 1395 *size = get_unaligned_be32(&cdb[6]); 1396 } else { 1397 /* 1398 * GPCMD_SEND_KEY from multi media commands 1399 */ 1400 *size = get_unaligned_be16(&cdb[8]); 1401 } 1402 break; 1403 case MAINTENANCE_OUT: 1404 if (dev->transport->get_device_type(dev) != TYPE_ROM) { 1405 /* 1406 * MAINTENANCE_OUT from SCC-2 1407 * Check for emulated MO_SET_TARGET_PGS. 1408 */ 1409 if (cdb[1] == MO_SET_TARGET_PGS) { 1410 cmd->execute_cmd = 1411 target_emulate_set_target_port_groups; 1412 } 1413 *size = get_unaligned_be32(&cdb[6]); 1414 } else { 1415 /* 1416 * GPCMD_SEND_KEY from multi media commands 1417 */ 1418 *size = get_unaligned_be16(&cdb[8]); 1419 } 1420 break; 1421 default: 1422 return TCM_UNSUPPORTED_SCSI_OPCODE; 1423 } 1424 1425 return 0; 1426 } 1427 EXPORT_SYMBOL(spc_parse_cdb); 1428