target_core_cdb.c revision e22a7f075226c51f3f71b922e9eeb4f99fac1475
1/* 2 * CDB emulation for non-READ/WRITE commands. 3 * 4 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. 5 * Copyright (c) 2005, 2006, 2007 SBE, Inc. 6 * Copyright (c) 2007-2010 Rising Tide Systems 7 * Copyright (c) 2008-2010 Linux-iSCSI.org 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 */ 25 26#include <asm/unaligned.h> 27#include <scsi/scsi.h> 28 29#include <target/target_core_base.h> 30#include <target/target_core_transport.h> 31#include <target/target_core_fabric_ops.h> 32#include "target_core_ua.h" 33 34static void 35target_fill_alua_data(struct se_port *port, unsigned char *buf) 36{ 37 struct t10_alua_tg_pt_gp *tg_pt_gp; 38 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 39 40 /* 41 * Set SCCS for MAINTENANCE_IN + REPORT_TARGET_PORT_GROUPS. 42 */ 43 buf[5] = 0x80; 44 45 /* 46 * Set TPGS field for explict and/or implict ALUA access type 47 * and opteration. 48 * 49 * See spc4r17 section 6.4.2 Table 135 50 */ 51 if (!port) 52 return; 53 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 54 if (!tg_pt_gp_mem) 55 return; 56 57 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 58 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 59 if (tg_pt_gp) 60 buf[5] |= tg_pt_gp->tg_pt_gp_alua_access_type; 61 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 62} 63 64static int 65target_emulate_inquiry_std(struct se_cmd *cmd) 66{ 67 struct se_lun *lun = cmd->se_lun; 68 struct se_device *dev = cmd->se_dev; 69 unsigned char *buf = cmd->t_task_buf; 70 71 /* 72 * Make sure we at least have 6 bytes of INQUIRY response 73 * payload going back for EVPD=0 74 */ 75 if (cmd->data_length < 6) { 76 printk(KERN_ERR "SCSI Inquiry payload length: %u" 77 " too small for EVPD=0\n", cmd->data_length); 78 return -EINVAL; 79 } 80 81 buf[0] = dev->transport->get_device_type(dev); 82 if (buf[0] == TYPE_TAPE) 83 buf[1] = 0x80; 84 buf[2] = dev->transport->get_device_rev(dev); 85 86 /* 87 * Enable SCCS and TPGS fields for Emulated ALUA 88 */ 89 if (dev->se_sub_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) 90 target_fill_alua_data(lun->lun_sep, buf); 91 92 if (cmd->data_length < 8) { 93 buf[4] = 1; /* Set additional length to 1 */ 94 return 0; 95 } 96 97 buf[7] = 0x32; /* Sync=1 and CmdQue=1 */ 98 99 /* 100 * Do not include vendor, product, reversion info in INQUIRY 101 * response payload for cdbs with a small allocation length. 102 */ 103 if (cmd->data_length < 36) { 104 buf[4] = 3; /* Set additional length to 3 */ 105 return 0; 106 } 107 108 snprintf((unsigned char *)&buf[8], 8, "LIO-ORG"); 109 snprintf((unsigned char *)&buf[16], 16, "%s", 110 &dev->se_sub_dev->t10_wwn.model[0]); 111 snprintf((unsigned char *)&buf[32], 4, "%s", 112 &dev->se_sub_dev->t10_wwn.revision[0]); 113 buf[4] = 31; /* Set additional length to 31 */ 114 return 0; 115} 116 117/* unit serial number */ 118static int 119target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf) 120{ 121 struct se_device *dev = cmd->se_dev; 122 u16 len = 0; 123 124 if (dev->se_sub_dev->su_dev_flags & 125 SDF_EMULATED_VPD_UNIT_SERIAL) { 126 u32 unit_serial_len; 127 128 unit_serial_len = 129 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]); 130 unit_serial_len++; /* For NULL Terminator */ 131 132 if (((len + 4) + unit_serial_len) > cmd->data_length) { 133 len += unit_serial_len; 134 buf[2] = ((len >> 8) & 0xff); 135 buf[3] = (len & 0xff); 136 return 0; 137 } 138 len += sprintf((unsigned char *)&buf[4], "%s", 139 &dev->se_sub_dev->t10_wwn.unit_serial[0]); 140 len++; /* Extra Byte for NULL Terminator */ 141 buf[3] = len; 142 } 143 return 0; 144} 145 146/* 147 * Device identification VPD, for a complete list of 148 * DESIGNATOR TYPEs see spc4r17 Table 459. 149 */ 150static int 151target_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf) 152{ 153 struct se_device *dev = cmd->se_dev; 154 struct se_lun *lun = cmd->se_lun; 155 struct se_port *port = NULL; 156 struct se_portal_group *tpg = NULL; 157 struct t10_alua_lu_gp_member *lu_gp_mem; 158 struct t10_alua_tg_pt_gp *tg_pt_gp; 159 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem; 160 unsigned char binary, binary_new; 161 unsigned char *prod = &dev->se_sub_dev->t10_wwn.model[0]; 162 u32 prod_len; 163 u32 unit_serial_len, off = 0; 164 int i; 165 u16 len = 0, id_len; 166 167 off = 4; 168 169 /* 170 * NAA IEEE Registered Extended Assigned designator format, see 171 * spc4r17 section 7.7.3.6.5 172 * 173 * We depend upon a target_core_mod/ConfigFS provided 174 * /sys/kernel/config/target/core/$HBA/$DEV/wwn/vpd_unit_serial 175 * value in order to return the NAA id. 176 */ 177 if (!(dev->se_sub_dev->su_dev_flags & SDF_EMULATED_VPD_UNIT_SERIAL)) 178 goto check_t10_vend_desc; 179 180 if (off + 20 > cmd->data_length) 181 goto check_t10_vend_desc; 182 183 /* CODE SET == Binary */ 184 buf[off++] = 0x1; 185 186 /* Set ASSOICATION == addressed logical unit: 0)b */ 187 buf[off] = 0x00; 188 189 /* Identifier/Designator type == NAA identifier */ 190 buf[off++] = 0x3; 191 off++; 192 193 /* Identifier/Designator length */ 194 buf[off++] = 0x10; 195 196 /* 197 * Start NAA IEEE Registered Extended Identifier/Designator 198 */ 199 buf[off++] = (0x6 << 4); 200 201 /* 202 * Use OpenFabrics IEEE Company ID: 00 14 05 203 */ 204 buf[off++] = 0x01; 205 buf[off++] = 0x40; 206 buf[off] = (0x5 << 4); 207 208 /* 209 * Return ConfigFS Unit Serial Number information for 210 * VENDOR_SPECIFIC_IDENTIFIER and 211 * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION 212 */ 213 binary = transport_asciihex_to_binaryhex( 214 &dev->se_sub_dev->t10_wwn.unit_serial[0]); 215 buf[off++] |= (binary & 0xf0) >> 4; 216 for (i = 0; i < 24; i += 2) { 217 binary_new = transport_asciihex_to_binaryhex( 218 &dev->se_sub_dev->t10_wwn.unit_serial[i+2]); 219 buf[off] = (binary & 0x0f) << 4; 220 buf[off++] |= (binary_new & 0xf0) >> 4; 221 binary = binary_new; 222 } 223 len = 20; 224 off = (len + 4); 225 226check_t10_vend_desc: 227 /* 228 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4 229 */ 230 id_len = 8; /* For Vendor field */ 231 prod_len = 4; /* For VPD Header */ 232 prod_len += 8; /* For Vendor field */ 233 prod_len += strlen(prod); 234 prod_len++; /* For : */ 235 236 if (dev->se_sub_dev->su_dev_flags & 237 SDF_EMULATED_VPD_UNIT_SERIAL) { 238 unit_serial_len = 239 strlen(&dev->se_sub_dev->t10_wwn.unit_serial[0]); 240 unit_serial_len++; /* For NULL Terminator */ 241 242 if ((len + (id_len + 4) + 243 (prod_len + unit_serial_len)) > 244 cmd->data_length) { 245 len += (prod_len + unit_serial_len); 246 goto check_port; 247 } 248 id_len += sprintf((unsigned char *)&buf[off+12], 249 "%s:%s", prod, 250 &dev->se_sub_dev->t10_wwn.unit_serial[0]); 251 } 252 buf[off] = 0x2; /* ASCII */ 253 buf[off+1] = 0x1; /* T10 Vendor ID */ 254 buf[off+2] = 0x0; 255 memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8); 256 /* Extra Byte for NULL Terminator */ 257 id_len++; 258 /* Identifier Length */ 259 buf[off+3] = id_len; 260 /* Header size for Designation descriptor */ 261 len += (id_len + 4); 262 off += (id_len + 4); 263 /* 264 * struct se_port is only set for INQUIRY VPD=1 through $FABRIC_MOD 265 */ 266check_port: 267 port = lun->lun_sep; 268 if (port) { 269 struct t10_alua_lu_gp *lu_gp; 270 u32 padding, scsi_name_len; 271 u16 lu_gp_id = 0; 272 u16 tg_pt_gp_id = 0; 273 u16 tpgt; 274 275 tpg = port->sep_tpg; 276 /* 277 * Relative target port identifer, see spc4r17 278 * section 7.7.3.7 279 * 280 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 281 * section 7.5.1 Table 362 282 */ 283 if (((len + 4) + 8) > cmd->data_length) { 284 len += 8; 285 goto check_tpgi; 286 } 287 buf[off] = 288 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); 289 buf[off++] |= 0x1; /* CODE SET == Binary */ 290 buf[off] = 0x80; /* Set PIV=1 */ 291 /* Set ASSOICATION == target port: 01b */ 292 buf[off] |= 0x10; 293 /* DESIGNATOR TYPE == Relative target port identifer */ 294 buf[off++] |= 0x4; 295 off++; /* Skip over Reserved */ 296 buf[off++] = 4; /* DESIGNATOR LENGTH */ 297 /* Skip over Obsolete field in RTPI payload 298 * in Table 472 */ 299 off += 2; 300 buf[off++] = ((port->sep_rtpi >> 8) & 0xff); 301 buf[off++] = (port->sep_rtpi & 0xff); 302 len += 8; /* Header size + Designation descriptor */ 303 /* 304 * Target port group identifier, see spc4r17 305 * section 7.7.3.8 306 * 307 * Get the PROTOCOL IDENTIFIER as defined by spc4r17 308 * section 7.5.1 Table 362 309 */ 310check_tpgi: 311 if (dev->se_sub_dev->t10_alua.alua_type != 312 SPC3_ALUA_EMULATED) 313 goto check_scsi_name; 314 315 if (((len + 4) + 8) > cmd->data_length) { 316 len += 8; 317 goto check_lu_gp; 318 } 319 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem; 320 if (!tg_pt_gp_mem) 321 goto check_lu_gp; 322 323 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 324 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp; 325 if (!(tg_pt_gp)) { 326 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 327 goto check_lu_gp; 328 } 329 tg_pt_gp_id = tg_pt_gp->tg_pt_gp_id; 330 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock); 331 332 buf[off] = 333 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); 334 buf[off++] |= 0x1; /* CODE SET == Binary */ 335 buf[off] = 0x80; /* Set PIV=1 */ 336 /* Set ASSOICATION == target port: 01b */ 337 buf[off] |= 0x10; 338 /* DESIGNATOR TYPE == Target port group identifier */ 339 buf[off++] |= 0x5; 340 off++; /* Skip over Reserved */ 341 buf[off++] = 4; /* DESIGNATOR LENGTH */ 342 off += 2; /* Skip over Reserved Field */ 343 buf[off++] = ((tg_pt_gp_id >> 8) & 0xff); 344 buf[off++] = (tg_pt_gp_id & 0xff); 345 len += 8; /* Header size + Designation descriptor */ 346 /* 347 * Logical Unit Group identifier, see spc4r17 348 * section 7.7.3.8 349 */ 350check_lu_gp: 351 if (((len + 4) + 8) > cmd->data_length) { 352 len += 8; 353 goto check_scsi_name; 354 } 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 buf[off++] = ((lu_gp_id >> 8) & 0xff); 375 buf[off++] = (lu_gp_id & 0xff); 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 */ 384check_scsi_name: 385 scsi_name_len = strlen(tpg->se_tpg_tfo->tpg_get_wwn(tpg)); 386 /* UTF-8 ",t,0x<16-bit TPGT>" + NULL Terminator */ 387 scsi_name_len += 10; 388 /* Check for 4-byte padding */ 389 padding = ((-scsi_name_len) & 3); 390 if (padding != 0) 391 scsi_name_len += padding; 392 /* Header size + Designation descriptor */ 393 scsi_name_len += 4; 394 395 if (((len + 4) + scsi_name_len) > cmd->data_length) { 396 len += scsi_name_len; 397 goto set_len; 398 } 399 buf[off] = 400 (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4); 401 buf[off++] |= 0x3; /* CODE SET == UTF-8 */ 402 buf[off] = 0x80; /* Set PIV=1 */ 403 /* Set ASSOICATION == target port: 01b */ 404 buf[off] |= 0x10; 405 /* DESIGNATOR TYPE == SCSI name string */ 406 buf[off++] |= 0x8; 407 off += 2; /* Skip over Reserved and length */ 408 /* 409 * SCSI name string identifer containing, $FABRIC_MOD 410 * dependent information. For LIO-Target and iSCSI 411 * Target Port, this means "<iSCSI name>,t,0x<TPGT> in 412 * UTF-8 encoding. 413 */ 414 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg); 415 scsi_name_len = sprintf(&buf[off], "%s,t,0x%04x", 416 tpg->se_tpg_tfo->tpg_get_wwn(tpg), tpgt); 417 scsi_name_len += 1 /* Include NULL terminator */; 418 /* 419 * The null-terminated, null-padded (see 4.4.2) SCSI 420 * NAME STRING field contains a UTF-8 format string. 421 * The number of bytes in the SCSI NAME STRING field 422 * (i.e., the value in the DESIGNATOR LENGTH field) 423 * shall be no larger than 256 and shall be a multiple 424 * of four. 425 */ 426 if (padding) 427 scsi_name_len += padding; 428 429 buf[off-1] = scsi_name_len; 430 off += scsi_name_len; 431 /* Header size + Designation descriptor */ 432 len += (scsi_name_len + 4); 433 } 434set_len: 435 buf[2] = ((len >> 8) & 0xff); 436 buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */ 437 return 0; 438} 439 440/* Extended INQUIRY Data VPD Page */ 441static int 442target_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf) 443{ 444 if (cmd->data_length < 60) 445 return 0; 446 447 buf[2] = 0x3c; 448 /* Set HEADSUP, ORDSUP, SIMPSUP */ 449 buf[5] = 0x07; 450 451 /* If WriteCache emulation is enabled, set V_SUP */ 452 if (cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) 453 buf[6] = 0x01; 454 return 0; 455} 456 457/* Block Limits VPD page */ 458static int 459target_emulate_evpd_b0(struct se_cmd *cmd, unsigned char *buf) 460{ 461 struct se_device *dev = cmd->se_dev; 462 int have_tp = 0; 463 464 /* 465 * Following sbc3r22 section 6.5.3 Block Limits VPD page, when 466 * emulate_tpu=1 or emulate_tpws=1 we will be expect a 467 * different page length for Thin Provisioning. 468 */ 469 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) 470 have_tp = 1; 471 472 if (cmd->data_length < (0x10 + 4)) { 473 printk(KERN_INFO "Received data_length: %u" 474 " too small for EVPD 0xb0\n", 475 cmd->data_length); 476 return -EINVAL; 477 } 478 479 if (have_tp && cmd->data_length < (0x3c + 4)) { 480 printk(KERN_INFO "Received data_length: %u" 481 " too small for TPE=1 EVPD 0xb0\n", 482 cmd->data_length); 483 have_tp = 0; 484 } 485 486 buf[0] = dev->transport->get_device_type(dev); 487 buf[3] = have_tp ? 0x3c : 0x10; 488 489 /* 490 * Set OPTIMAL TRANSFER LENGTH GRANULARITY 491 */ 492 put_unaligned_be16(1, &buf[6]); 493 494 /* 495 * Set MAXIMUM TRANSFER LENGTH 496 */ 497 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_sectors, &buf[8]); 498 499 /* 500 * Set OPTIMAL TRANSFER LENGTH 501 */ 502 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.optimal_sectors, &buf[12]); 503 504 /* 505 * Exit now if we don't support TP or the initiator sent a too 506 * short buffer. 507 */ 508 if (!have_tp || cmd->data_length < (0x3c + 4)) 509 return 0; 510 511 /* 512 * Set MAXIMUM UNMAP LBA COUNT 513 */ 514 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count, &buf[20]); 515 516 /* 517 * Set MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT 518 */ 519 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count, 520 &buf[24]); 521 522 /* 523 * Set OPTIMAL UNMAP GRANULARITY 524 */ 525 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity, &buf[28]); 526 527 /* 528 * UNMAP GRANULARITY ALIGNMENT 529 */ 530 put_unaligned_be32(dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment, 531 &buf[32]); 532 if (dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment != 0) 533 buf[32] |= 0x80; /* Set the UGAVALID bit */ 534 535 return 0; 536} 537 538/* Block Device Characteristics VPD page */ 539static int 540target_emulate_evpd_b1(struct se_cmd *cmd, unsigned char *buf) 541{ 542 struct se_device *dev = cmd->se_dev; 543 544 buf[0] = dev->transport->get_device_type(dev); 545 buf[3] = 0x3c; 546 547 if (cmd->data_length >= 5 && 548 dev->se_sub_dev->se_dev_attrib.is_nonrot) 549 buf[5] = 1; 550 551 return 0; 552} 553 554/* Thin Provisioning VPD */ 555static int 556target_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf) 557{ 558 struct se_device *dev = cmd->se_dev; 559 560 /* 561 * From sbc3r22 section 6.5.4 Thin Provisioning VPD page: 562 * 563 * The PAGE LENGTH field is defined in SPC-4. If the DP bit is set to 564 * zero, then the page length shall be set to 0004h. If the DP bit 565 * is set to one, then the page length shall be set to the value 566 * defined in table 162. 567 */ 568 buf[0] = dev->transport->get_device_type(dev); 569 570 /* 571 * Set Hardcoded length mentioned above for DP=0 572 */ 573 put_unaligned_be16(0x0004, &buf[2]); 574 575 /* 576 * The THRESHOLD EXPONENT field indicates the threshold set size in 577 * LBAs as a power of 2 (i.e., the threshold set size is equal to 578 * 2(threshold exponent)). 579 * 580 * Note that this is currently set to 0x00 as mkp says it will be 581 * changing again. We can enable this once it has settled in T10 582 * and is actually used by Linux/SCSI ML code. 583 */ 584 buf[4] = 0x00; 585 586 /* 587 * A TPU bit set to one indicates that the device server supports 588 * the UNMAP command (see 5.25). A TPU bit set to zero indicates 589 * that the device server does not support the UNMAP command. 590 */ 591 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu != 0) 592 buf[5] = 0x80; 593 594 /* 595 * A TPWS bit set to one indicates that the device server supports 596 * the use of the WRITE SAME (16) command (see 5.42) to unmap LBAs. 597 * A TPWS bit set to zero indicates that the device server does not 598 * support the use of the WRITE SAME (16) command to unmap LBAs. 599 */ 600 if (dev->se_sub_dev->se_dev_attrib.emulate_tpws != 0) 601 buf[5] |= 0x40; 602 603 return 0; 604} 605 606static int 607target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf); 608 609static struct { 610 uint8_t page; 611 int (*emulate)(struct se_cmd *, unsigned char *); 612} evpd_handlers[] = { 613 { .page = 0x00, .emulate = target_emulate_evpd_00 }, 614 { .page = 0x80, .emulate = target_emulate_evpd_80 }, 615 { .page = 0x83, .emulate = target_emulate_evpd_83 }, 616 { .page = 0x86, .emulate = target_emulate_evpd_86 }, 617 { .page = 0xb0, .emulate = target_emulate_evpd_b0 }, 618 { .page = 0xb1, .emulate = target_emulate_evpd_b1 }, 619 { .page = 0xb2, .emulate = target_emulate_evpd_b2 }, 620}; 621 622/* supported vital product data pages */ 623static int 624target_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf) 625{ 626 int p; 627 628 if (cmd->data_length < 8) 629 return 0; 630 /* 631 * Only report the INQUIRY EVPD=1 pages after a valid NAA 632 * Registered Extended LUN WWN has been set via ConfigFS 633 * during device creation/restart. 634 */ 635 if (cmd->se_dev->se_sub_dev->su_dev_flags & 636 SDF_EMULATED_VPD_UNIT_SERIAL) { 637 buf[3] = ARRAY_SIZE(evpd_handlers); 638 for (p = 0; p < min_t(int, ARRAY_SIZE(evpd_handlers), 639 cmd->data_length - 4); ++p) 640 buf[p + 4] = evpd_handlers[p].page; 641 } 642 643 return 0; 644} 645 646static int 647target_emulate_inquiry(struct se_cmd *cmd) 648{ 649 struct se_device *dev = cmd->se_dev; 650 unsigned char *buf = cmd->t_task_buf; 651 unsigned char *cdb = cmd->t_task_cdb; 652 int p; 653 654 if (!(cdb[1] & 0x1)) 655 return target_emulate_inquiry_std(cmd); 656 657 /* 658 * Make sure we at least have 4 bytes of INQUIRY response 659 * payload for 0x00 going back for EVPD=1. Note that 0x80 660 * and 0x83 will check for enough payload data length and 661 * jump to set_len: label when there is not enough inquiry EVPD 662 * payload length left for the next outgoing EVPD metadata 663 */ 664 if (cmd->data_length < 4) { 665 printk(KERN_ERR "SCSI Inquiry payload length: %u" 666 " too small for EVPD=1\n", cmd->data_length); 667 return -EINVAL; 668 } 669 buf[0] = dev->transport->get_device_type(dev); 670 671 for (p = 0; p < ARRAY_SIZE(evpd_handlers); ++p) 672 if (cdb[2] == evpd_handlers[p].page) { 673 buf[1] = cdb[2]; 674 return evpd_handlers[p].emulate(cmd, buf); 675 } 676 677 printk(KERN_ERR "Unknown VPD Code: 0x%02x\n", cdb[2]); 678 return -EINVAL; 679} 680 681static int 682target_emulate_readcapacity(struct se_cmd *cmd) 683{ 684 struct se_device *dev = cmd->se_dev; 685 unsigned char *buf = cmd->t_task_buf; 686 unsigned long long blocks_long = dev->transport->get_blocks(dev); 687 u32 blocks; 688 689 if (blocks_long >= 0x00000000ffffffff) 690 blocks = 0xffffffff; 691 else 692 blocks = (u32)blocks_long; 693 694 buf[0] = (blocks >> 24) & 0xff; 695 buf[1] = (blocks >> 16) & 0xff; 696 buf[2] = (blocks >> 8) & 0xff; 697 buf[3] = blocks & 0xff; 698 buf[4] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; 699 buf[5] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; 700 buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; 701 buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; 702 /* 703 * Set max 32-bit blocks to signal SERVICE ACTION READ_CAPACITY_16 704 */ 705 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) 706 put_unaligned_be32(0xFFFFFFFF, &buf[0]); 707 708 return 0; 709} 710 711static int 712target_emulate_readcapacity_16(struct se_cmd *cmd) 713{ 714 struct se_device *dev = cmd->se_dev; 715 unsigned char *buf = cmd->t_task_buf; 716 unsigned long long blocks = dev->transport->get_blocks(dev); 717 718 buf[0] = (blocks >> 56) & 0xff; 719 buf[1] = (blocks >> 48) & 0xff; 720 buf[2] = (blocks >> 40) & 0xff; 721 buf[3] = (blocks >> 32) & 0xff; 722 buf[4] = (blocks >> 24) & 0xff; 723 buf[5] = (blocks >> 16) & 0xff; 724 buf[6] = (blocks >> 8) & 0xff; 725 buf[7] = blocks & 0xff; 726 buf[8] = (dev->se_sub_dev->se_dev_attrib.block_size >> 24) & 0xff; 727 buf[9] = (dev->se_sub_dev->se_dev_attrib.block_size >> 16) & 0xff; 728 buf[10] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff; 729 buf[11] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff; 730 /* 731 * Set Thin Provisioning Enable bit following sbc3r22 in section 732 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 733 */ 734 if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws) 735 buf[14] = 0x80; 736 737 return 0; 738} 739 740static int 741target_modesense_rwrecovery(unsigned char *p) 742{ 743 p[0] = 0x01; 744 p[1] = 0x0a; 745 746 return 12; 747} 748 749static int 750target_modesense_control(struct se_device *dev, unsigned char *p) 751{ 752 p[0] = 0x0a; 753 p[1] = 0x0a; 754 p[2] = 2; 755 /* 756 * From spc4r17, section 7.4.6 Control mode Page 757 * 758 * Unit Attention interlocks control (UN_INTLCK_CTRL) to code 00b 759 * 760 * 00b: The logical unit shall clear any unit attention condition 761 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 762 * status and shall not establish a unit attention condition when a com- 763 * mand is completed with BUSY, TASK SET FULL, or RESERVATION CONFLICT 764 * status. 765 * 766 * 10b: The logical unit shall not clear any unit attention condition 767 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 768 * status and shall not establish a unit attention condition when 769 * a command is completed with BUSY, TASK SET FULL, or RESERVATION 770 * CONFLICT status. 771 * 772 * 11b a The logical unit shall not clear any unit attention condition 773 * reported in the same I_T_L_Q nexus transaction as a CHECK CONDITION 774 * status and shall establish a unit attention condition for the 775 * initiator port associated with the I_T nexus on which the BUSY, 776 * TASK SET FULL, or RESERVATION CONFLICT status is being returned. 777 * Depending on the status, the additional sense code shall be set to 778 * PREVIOUS BUSY STATUS, PREVIOUS TASK SET FULL STATUS, or PREVIOUS 779 * RESERVATION CONFLICT STATUS. Until it is cleared by a REQUEST SENSE 780 * command, a unit attention condition shall be established only once 781 * for a BUSY, TASK SET FULL, or RESERVATION CONFLICT status regardless 782 * to the number of commands completed with one of those status codes. 783 */ 784 p[4] = (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) ? 0x30 : 785 (dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 1) ? 0x20 : 0x00; 786 /* 787 * From spc4r17, section 7.4.6 Control mode Page 788 * 789 * Task Aborted Status (TAS) bit set to zero. 790 * 791 * A task aborted status (TAS) bit set to zero specifies that aborted 792 * tasks shall be terminated by the device server without any response 793 * to the application client. A TAS bit set to one specifies that tasks 794 * aborted by the actions of an I_T nexus other than the I_T nexus on 795 * which the command was received shall be completed with TASK ABORTED 796 * status (see SAM-4). 797 */ 798 p[5] = (dev->se_sub_dev->se_dev_attrib.emulate_tas) ? 0x40 : 0x00; 799 p[8] = 0xff; 800 p[9] = 0xff; 801 p[11] = 30; 802 803 return 12; 804} 805 806static int 807target_modesense_caching(struct se_device *dev, unsigned char *p) 808{ 809 p[0] = 0x08; 810 p[1] = 0x12; 811 if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) 812 p[2] = 0x04; /* Write Cache Enable */ 813 p[12] = 0x20; /* Disabled Read Ahead */ 814 815 return 20; 816} 817 818static void 819target_modesense_write_protect(unsigned char *buf, int type) 820{ 821 /* 822 * I believe that the WP bit (bit 7) in the mode header is the same for 823 * all device types.. 824 */ 825 switch (type) { 826 case TYPE_DISK: 827 case TYPE_TAPE: 828 default: 829 buf[0] |= 0x80; /* WP bit */ 830 break; 831 } 832} 833 834static void 835target_modesense_dpofua(unsigned char *buf, int type) 836{ 837 switch (type) { 838 case TYPE_DISK: 839 buf[0] |= 0x10; /* DPOFUA bit */ 840 break; 841 default: 842 break; 843 } 844} 845 846static int 847target_emulate_modesense(struct se_cmd *cmd, int ten) 848{ 849 struct se_device *dev = cmd->se_dev; 850 char *cdb = cmd->t_task_cdb; 851 unsigned char *rbuf = cmd->t_task_buf; 852 int type = dev->transport->get_device_type(dev); 853 int offset = (ten) ? 8 : 4; 854 int length = 0; 855 unsigned char buf[SE_MODE_PAGE_BUF]; 856 857 memset(buf, 0, SE_MODE_PAGE_BUF); 858 859 switch (cdb[2] & 0x3f) { 860 case 0x01: 861 length = target_modesense_rwrecovery(&buf[offset]); 862 break; 863 case 0x08: 864 length = target_modesense_caching(dev, &buf[offset]); 865 break; 866 case 0x0a: 867 length = target_modesense_control(dev, &buf[offset]); 868 break; 869 case 0x3f: 870 length = target_modesense_rwrecovery(&buf[offset]); 871 length += target_modesense_caching(dev, &buf[offset+length]); 872 length += target_modesense_control(dev, &buf[offset+length]); 873 break; 874 default: 875 printk(KERN_ERR "Got Unknown Mode Page: 0x%02x\n", 876 cdb[2] & 0x3f); 877 return PYX_TRANSPORT_UNKNOWN_MODE_PAGE; 878 } 879 offset += length; 880 881 if (ten) { 882 offset -= 2; 883 buf[0] = (offset >> 8) & 0xff; 884 buf[1] = offset & 0xff; 885 886 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) || 887 (cmd->se_deve && 888 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY))) 889 target_modesense_write_protect(&buf[3], type); 890 891 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) && 892 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0)) 893 target_modesense_dpofua(&buf[3], type); 894 895 if ((offset + 2) > cmd->data_length) 896 offset = cmd->data_length; 897 898 } else { 899 offset -= 1; 900 buf[0] = offset & 0xff; 901 902 if ((cmd->se_lun->lun_access & TRANSPORT_LUNFLAGS_READ_ONLY) || 903 (cmd->se_deve && 904 (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_READ_ONLY))) 905 target_modesense_write_protect(&buf[2], type); 906 907 if ((dev->se_sub_dev->se_dev_attrib.emulate_write_cache > 0) && 908 (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0)) 909 target_modesense_dpofua(&buf[2], type); 910 911 if ((offset + 1) > cmd->data_length) 912 offset = cmd->data_length; 913 } 914 memcpy(rbuf, buf, offset); 915 916 return 0; 917} 918 919static int 920target_emulate_request_sense(struct se_cmd *cmd) 921{ 922 unsigned char *cdb = cmd->t_task_cdb; 923 unsigned char *buf = cmd->t_task_buf; 924 u8 ua_asc = 0, ua_ascq = 0; 925 926 if (cdb[1] & 0x01) { 927 printk(KERN_ERR "REQUEST_SENSE description emulation not" 928 " supported\n"); 929 return PYX_TRANSPORT_INVALID_CDB_FIELD; 930 } 931 if (!(core_scsi3_ua_clear_for_request_sense(cmd, &ua_asc, &ua_ascq))) { 932 /* 933 * CURRENT ERROR, UNIT ATTENTION 934 */ 935 buf[0] = 0x70; 936 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; 937 /* 938 * Make sure request data length is enough for additional 939 * sense data. 940 */ 941 if (cmd->data_length <= 18) { 942 buf[7] = 0x00; 943 return 0; 944 } 945 /* 946 * The Additional Sense Code (ASC) from the UNIT ATTENTION 947 */ 948 buf[SPC_ASC_KEY_OFFSET] = ua_asc; 949 buf[SPC_ASCQ_KEY_OFFSET] = ua_ascq; 950 buf[7] = 0x0A; 951 } else { 952 /* 953 * CURRENT ERROR, NO SENSE 954 */ 955 buf[0] = 0x70; 956 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE; 957 /* 958 * Make sure request data length is enough for additional 959 * sense data. 960 */ 961 if (cmd->data_length <= 18) { 962 buf[7] = 0x00; 963 return 0; 964 } 965 /* 966 * NO ADDITIONAL SENSE INFORMATION 967 */ 968 buf[SPC_ASC_KEY_OFFSET] = 0x00; 969 buf[7] = 0x0A; 970 } 971 972 return 0; 973} 974 975/* 976 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. 977 * Note this is not used for TCM/pSCSI passthrough 978 */ 979static int 980target_emulate_unmap(struct se_task *task) 981{ 982 struct se_cmd *cmd = task->task_se_cmd; 983 struct se_device *dev = cmd->se_dev; 984 unsigned char *buf = cmd->t_task_buf, *ptr = NULL; 985 unsigned char *cdb = &cmd->t_task_cdb[0]; 986 sector_t lba; 987 unsigned int size = cmd->data_length, range; 988 int ret, offset; 989 unsigned short dl, bd_dl; 990 991 /* First UNMAP block descriptor starts at 8 byte offset */ 992 offset = 8; 993 size -= 8; 994 dl = get_unaligned_be16(&cdb[0]); 995 bd_dl = get_unaligned_be16(&cdb[2]); 996 ptr = &buf[offset]; 997 printk(KERN_INFO "UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu" 998 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 999 1000 while (size) { 1001 lba = get_unaligned_be64(&ptr[0]); 1002 range = get_unaligned_be32(&ptr[8]); 1003 printk(KERN_INFO "UNMAP: Using lba: %llu and range: %u\n", 1004 (unsigned long long)lba, range); 1005 1006 ret = dev->transport->do_discard(dev, lba, range); 1007 if (ret < 0) { 1008 printk(KERN_ERR "blkdev_issue_discard() failed: %d\n", 1009 ret); 1010 return ret; 1011 } 1012 1013 ptr += 16; 1014 size -= 16; 1015 } 1016 1017 task->task_scsi_status = GOOD; 1018 transport_complete_task(task, 1); 1019 return 0; 1020} 1021 1022/* 1023 * Used for TCM/IBLOCK and TCM/FILEIO for block/blk-lib.c level discard support. 1024 * Note this is not used for TCM/pSCSI passthrough 1025 */ 1026static int 1027target_emulate_write_same(struct se_task *task, int write_same32) 1028{ 1029 struct se_cmd *cmd = task->task_se_cmd; 1030 struct se_device *dev = cmd->se_dev; 1031 sector_t range; 1032 sector_t lba = cmd->t_task_lba; 1033 unsigned int num_blocks; 1034 int ret; 1035 /* 1036 * Extract num_blocks from the WRITE_SAME_* CDB. Then use the explict 1037 * range when non zero is supplied, otherwise calculate the remaining 1038 * range based on ->get_blocks() - starting LBA. 1039 */ 1040 if (write_same32) 1041 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1042 else 1043 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1044 1045 if (num_blocks != 0) 1046 range = num_blocks; 1047 else 1048 range = (dev->transport->get_blocks(dev) - lba); 1049 1050 printk(KERN_INFO "WRITE_SAME UNMAP: LBA: %llu Range: %llu\n", 1051 (unsigned long long)lba, (unsigned long long)range); 1052 1053 ret = dev->transport->do_discard(dev, lba, range); 1054 if (ret < 0) { 1055 printk(KERN_INFO "blkdev_issue_discard() failed for WRITE_SAME\n"); 1056 return ret; 1057 } 1058 1059 task->task_scsi_status = GOOD; 1060 transport_complete_task(task, 1); 1061 return 0; 1062} 1063 1064int 1065transport_emulate_control_cdb(struct se_task *task) 1066{ 1067 struct se_cmd *cmd = task->task_se_cmd; 1068 struct se_device *dev = cmd->se_dev; 1069 unsigned short service_action; 1070 int ret = 0; 1071 1072 switch (cmd->t_task_cdb[0]) { 1073 case INQUIRY: 1074 ret = target_emulate_inquiry(cmd); 1075 break; 1076 case READ_CAPACITY: 1077 ret = target_emulate_readcapacity(cmd); 1078 break; 1079 case MODE_SENSE: 1080 ret = target_emulate_modesense(cmd, 0); 1081 break; 1082 case MODE_SENSE_10: 1083 ret = target_emulate_modesense(cmd, 1); 1084 break; 1085 case SERVICE_ACTION_IN: 1086 switch (cmd->t_task_cdb[1] & 0x1f) { 1087 case SAI_READ_CAPACITY_16: 1088 ret = target_emulate_readcapacity_16(cmd); 1089 break; 1090 default: 1091 printk(KERN_ERR "Unsupported SA: 0x%02x\n", 1092 cmd->t_task_cdb[1] & 0x1f); 1093 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1094 } 1095 break; 1096 case REQUEST_SENSE: 1097 ret = target_emulate_request_sense(cmd); 1098 break; 1099 case UNMAP: 1100 if (!dev->transport->do_discard) { 1101 printk(KERN_ERR "UNMAP emulation not supported for: %s\n", 1102 dev->transport->name); 1103 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1104 } 1105 ret = target_emulate_unmap(task); 1106 break; 1107 case WRITE_SAME_16: 1108 if (!dev->transport->do_discard) { 1109 printk(KERN_ERR "WRITE_SAME_16 emulation not supported" 1110 " for: %s\n", dev->transport->name); 1111 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1112 } 1113 ret = target_emulate_write_same(task, 0); 1114 break; 1115 case VARIABLE_LENGTH_CMD: 1116 service_action = 1117 get_unaligned_be16(&cmd->t_task_cdb[8]); 1118 switch (service_action) { 1119 case WRITE_SAME_32: 1120 if (!dev->transport->do_discard) { 1121 printk(KERN_ERR "WRITE_SAME_32 SA emulation not" 1122 " supported for: %s\n", 1123 dev->transport->name); 1124 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1125 } 1126 ret = target_emulate_write_same(task, 1); 1127 break; 1128 default: 1129 printk(KERN_ERR "Unsupported VARIABLE_LENGTH_CMD SA:" 1130 " 0x%02x\n", service_action); 1131 break; 1132 } 1133 break; 1134 case SYNCHRONIZE_CACHE: 1135 case 0x91: /* SYNCHRONIZE_CACHE_16: */ 1136 if (!dev->transport->do_sync_cache) { 1137 printk(KERN_ERR 1138 "SYNCHRONIZE_CACHE emulation not supported" 1139 " for: %s\n", dev->transport->name); 1140 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1141 } 1142 dev->transport->do_sync_cache(task); 1143 break; 1144 case ALLOW_MEDIUM_REMOVAL: 1145 case ERASE: 1146 case REZERO_UNIT: 1147 case SEEK_10: 1148 case SPACE: 1149 case START_STOP: 1150 case TEST_UNIT_READY: 1151 case VERIFY: 1152 case WRITE_FILEMARKS: 1153 break; 1154 default: 1155 printk(KERN_ERR "Unsupported SCSI Opcode: 0x%02x for %s\n", 1156 cmd->t_task_cdb[0], dev->transport->name); 1157 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; 1158 } 1159 1160 if (ret < 0) 1161 return ret; 1162 task->task_scsi_status = GOOD; 1163 transport_complete_task(task, 1); 1164 1165 return PYX_TRANSPORT_SENT_TO_TRANSPORT; 1166} 1167