drivers/target/target_core_sbc.c

   1 /*
   2  * SCSI Block Commands (SBC) 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 <linux/ratelimit.h>
  26 #include <linux/crc-t10dif.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi.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_ua.h"
  37 #include "target_core_alua.h"
  38
  39 static sense_reason_t
  40 sbc_emulate_readcapacity(struct se_cmd *cmd)
  41 {
  42         struct se_device *dev = cmd->se_dev;
  43         unsigned char *cdb = cmd->t_task_cdb;
  44         unsigned long long blocks_long = dev->transport->get_blocks(dev);
  45         unsigned char *rbuf;
  46         unsigned char buf[8];
  47         u32 blocks;
  48
  49         /*
  50          * SBC-2 says:
  51          *   If the PMI bit is set to zero and the LOGICAL BLOCK
  52          *   ADDRESS field is not set to zero, the device server shall
  53          *   terminate the command with CHECK CONDITION status with
  54          *   the sense key set to ILLEGAL REQUEST and the additional
  55          *   sense code set to INVALID FIELD IN CDB.
  56          *
  57          * In SBC-3, these fields are obsolete, but some SCSI
  58          * compliance tests actually check this, so we might as well
  59          * follow SBC-2.
  60          */
  61         if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
  62                 return TCM_INVALID_CDB_FIELD;
  63
  64         if (blocks_long >= 0x00000000ffffffff)
  65                 blocks = 0xffffffff;
  66         else
  67                 blocks = (u32)blocks_long;
  68
  69         buf[0] = (blocks >> 24) & 0xff;
  70         buf[1] = (blocks >> 16) & 0xff;
  71         buf[2] = (blocks >> 8) & 0xff;
  72         buf[3] = blocks & 0xff;
  73         buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
  74         buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
  75         buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
  76         buf[7] = dev->dev_attrib.block_size & 0xff;
  77
  78         rbuf = transport_kmap_data_sg(cmd);
  79         if (rbuf) {
  80                 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
  81                 transport_kunmap_data_sg(cmd);
  82         }
  83
  84         target_complete_cmd(cmd, GOOD);
  85         return 0;
  86 }
  87
  88 static sense_reason_t
  89 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
  90 {
  91         struct se_device *dev = cmd->se_dev;
  92         struct se_session *sess = cmd->se_sess;
  93         unsigned char *rbuf;
  94         unsigned char buf[32];
  95         unsigned long long blocks = dev->transport->get_blocks(dev);
  96
  97         memset(buf, 0, sizeof(buf));
  98         buf[0] = (blocks >> 56) & 0xff;
  99         buf[1] = (blocks >> 48) & 0xff;
 100         buf[2] = (blocks >> 40) & 0xff;
 101         buf[3] = (blocks >> 32) & 0xff;
 102         buf[4] = (blocks >> 24) & 0xff;
 103         buf[5] = (blocks >> 16) & 0xff;
 104         buf[6] = (blocks >> 8) & 0xff;
 105         buf[7] = blocks & 0xff;
 106         buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
 107         buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
 108         buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
 109         buf[11] = dev->dev_attrib.block_size & 0xff;
 110         /*
 111          * Set P_TYPE and PROT_EN bits for DIF support
 112          */
 113         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 114                 if (dev->dev_attrib.pi_prot_type)
 115                         buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1;
 116         }
 117
 118         if (dev->transport->get_lbppbe)
 119                 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
 120
 121         if (dev->transport->get_alignment_offset_lbas) {
 122                 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
 123                 buf[14] = (lalba >> 8) & 0x3f;
 124                 buf[15] = lalba & 0xff;
 125         }
 126
 127         /*
 128          * Set Thin Provisioning Enable bit following sbc3r22 in section
 129          * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
 130          */
 131         if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 132                 buf[14] |= 0x80;
 133
 134         rbuf = transport_kmap_data_sg(cmd);
 135         if (rbuf) {
 136                 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 137                 transport_kunmap_data_sg(cmd);
 138         }
 139
 140         target_complete_cmd(cmd, GOOD);
 141         return 0;
 142 }
 143
 144 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
 145 {
 146         u32 num_blocks;
 147
 148         if (cmd->t_task_cdb[0] == WRITE_SAME)
 149                 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
 150         else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
 151                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 152         else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
 153                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 154
 155         /*
 156          * Use the explicit range when non zero is supplied, otherwise calculate
 157          * the remaining range based on ->get_blocks() - starting LBA.
 158          */
 159         if (num_blocks)
 160                 return num_blocks;
 161
 162         return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
 163                 cmd->t_task_lba + 1;
 164 }
 165 EXPORT_SYMBOL(sbc_get_write_same_sectors);
 166
 167 static sense_reason_t
 168 sbc_emulate_noop(struct se_cmd *cmd)
 169 {
 170         target_complete_cmd(cmd, GOOD);
 171         return 0;
 172 }
 173
 174 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 175 {
 176         return cmd->se_dev->dev_attrib.block_size * sectors;
 177 }
 178
 179 static int sbc_check_valid_sectors(struct se_cmd *cmd)
 180 {
 181         struct se_device *dev = cmd->se_dev;
 182         unsigned long long end_lba;
 183         u32 sectors;
 184
 185         sectors = cmd->data_length / dev->dev_attrib.block_size;
 186         end_lba = dev->transport->get_blocks(dev) + 1;
 187
 188         if (cmd->t_task_lba + sectors > end_lba) {
 189                 pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
 190                         cmd->t_task_lba, sectors, end_lba);
 191                 return -EINVAL;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static inline u32 transport_get_sectors_6(unsigned char *cdb)
 198 {
 199         /*
 200          * Use 8-bit sector value.  SBC-3 says:
 201          *
 202          *   A TRANSFER LENGTH field set to zero specifies that 256
 203          *   logical blocks shall be written.  Any other value
 204          *   specifies the number of logical blocks that shall be
 205          *   written.
 206          */
 207         return cdb[4] ? : 256;
 208 }
 209
 210 static inline u32 transport_get_sectors_10(unsigned char *cdb)
 211 {
 212         return (u32)(cdb[7] << 8) + cdb[8];
 213 }
 214
 215 static inline u32 transport_get_sectors_12(unsigned char *cdb)
 216 {
 217         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
 218 }
 219
 220 static inline u32 transport_get_sectors_16(unsigned char *cdb)
 221 {
 222         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
 223                     (cdb[12] << 8) + cdb[13];
 224 }
 225
 226 /*
 227  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 228  */
 229 static inline u32 transport_get_sectors_32(unsigned char *cdb)
 230 {
 231         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
 232                     (cdb[30] << 8) + cdb[31];
 233
 234 }
 235
 236 static inline u32 transport_lba_21(unsigned char *cdb)
 237 {
 238         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
 239 }
 240
 241 static inline u32 transport_lba_32(unsigned char *cdb)
 242 {
 243         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 244 }
 245
 246 static inline unsigned long long transport_lba_64(unsigned char *cdb)
 247 {
 248         unsigned int __v1, __v2;
 249
 250         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 251         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
 252
 253         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 254 }
 255
 256 /*
 257  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 258  */
 259 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 260 {
 261         unsigned int __v1, __v2;
 262
 263         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
 264         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
 265
 266         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 267 }
 268
 269 static sense_reason_t
 270 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
 271 {
 272         unsigned int sectors = sbc_get_write_same_sectors(cmd);
 273
 274         if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
 275                 pr_err("WRITE_SAME PBDATA and LBDATA"
 276                         " bits not supported for Block Discard"
 277                         " Emulation\n");
 278                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 279         }
 280         if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
 281                 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
 282                         sectors, cmd->se_dev->dev_attrib.max_write_same_len);
 283                 return TCM_INVALID_CDB_FIELD;
 284         }
 285         /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
 286         if (flags[0] & 0x10) {
 287                 pr_warn("WRITE SAME with ANCHOR not supported\n");
 288                 return TCM_INVALID_CDB_FIELD;
 289         }
 290         /*
 291          * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
 292          * translated into block discard requests within backend code.
 293          */
 294         if (flags[0] & 0x08) {
 295                 if (!ops->execute_write_same_unmap)
 296                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 297
 298                 cmd->execute_cmd = ops->execute_write_same_unmap;
 299                 return 0;
 300         }
 301         if (!ops->execute_write_same)
 302                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 303
 304         cmd->execute_cmd = ops->execute_write_same;
 305         return 0;
 306 }
 307
 308 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd)
 309 {
 310         unsigned char *buf, *addr;
 311         struct scatterlist *sg;
 312         unsigned int offset;
 313         sense_reason_t ret = TCM_NO_SENSE;
 314         int i, count;
 315         /*
 316          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
 317          *
 318          * 1) read the specified logical block(s);
 319          * 2) transfer logical blocks from the data-out buffer;
 320          * 3) XOR the logical blocks transferred from the data-out buffer with
 321          *    the logical blocks read, storing the resulting XOR data in a buffer;
 322          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
 323          *    blocks transferred from the data-out buffer; and
 324          * 5) transfer the resulting XOR data to the data-in buffer.
 325          */
 326         buf = kmalloc(cmd->data_length, GFP_KERNEL);
 327         if (!buf) {
 328                 pr_err("Unable to allocate xor_callback buf\n");
 329                 return TCM_OUT_OF_RESOURCES;
 330         }
 331         /*
 332          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
 333          * into the locally allocated *buf
 334          */
 335         sg_copy_to_buffer(cmd->t_data_sg,
 336                           cmd->t_data_nents,
 337                           buf,
 338                           cmd->data_length);
 339
 340         /*
 341          * Now perform the XOR against the BIDI read memory located at
 342          * cmd->t_mem_bidi_list
 343          */
 344
 345         offset = 0;
 346         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
 347                 addr = kmap_atomic(sg_page(sg));
 348                 if (!addr) {
 349                         ret = TCM_OUT_OF_RESOURCES;
 350                         goto out;
 351                 }
 352
 353                 for (i = 0; i < sg->length; i++)
 354                         *(addr + sg->offset + i) ^= *(buf + offset + i);
 355
 356                 offset += sg->length;
 357                 kunmap_atomic(addr);
 358         }
 359
 360 out:
 361         kfree(buf);
 362         return ret;
 363 }
 364
 365 static sense_reason_t
 366 sbc_execute_rw(struct se_cmd *cmd)
 367 {
 368         return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
 369                                cmd->data_direction);
 370 }
 371
 372 static sense_reason_t compare_and_write_post(struct se_cmd *cmd)
 373 {
 374         struct se_device *dev = cmd->se_dev;
 375
 376         /*
 377          * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
 378          * within target_complete_ok_work() if the command was successfully
 379          * sent to the backend driver.
 380          */
 381         spin_lock_irq(&cmd->t_state_lock);
 382         if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
 383                 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
 384         spin_unlock_irq(&cmd->t_state_lock);
 385
 386         /*
 387          * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
 388          * before the original READ I/O submission.
 389          */
 390         up(&dev->caw_sem);
 391
 392         return TCM_NO_SENSE;
 393 }
 394
 395 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd)
 396 {
 397         struct se_device *dev = cmd->se_dev;
 398         struct scatterlist *write_sg = NULL, *sg;
 399         unsigned char *buf = NULL, *addr;
 400         struct sg_mapping_iter m;
 401         unsigned int offset = 0, len;
 402         unsigned int nlbas = cmd->t_task_nolb;
 403         unsigned int block_size = dev->dev_attrib.block_size;
 404         unsigned int compare_len = (nlbas * block_size);
 405         sense_reason_t ret = TCM_NO_SENSE;
 406         int rc, i;
 407
 408         /*
 409          * Handle early failure in transport_generic_request_failure(),
 410          * which will not have taken ->caw_mutex yet..
 411          */
 412         if (!cmd->t_data_sg || !cmd->t_bidi_data_sg)
 413                 return TCM_NO_SENSE;
 414         /*
 415          * Immediately exit + release dev->caw_sem if command has already
 416          * been failed with a non-zero SCSI status.
 417          */
 418         if (cmd->scsi_status) {
 419                 pr_err("compare_and_write_callback: non zero scsi_status:"
 420                         " 0x%02x\n", cmd->scsi_status);
 421                 goto out;
 422         }
 423
 424         buf = kzalloc(cmd->data_length, GFP_KERNEL);
 425         if (!buf) {
 426                 pr_err("Unable to allocate compare_and_write buf\n");
 427                 ret = TCM_OUT_OF_RESOURCES;
 428                 goto out;
 429         }
 430
 431         write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
 432                            GFP_KERNEL);
 433         if (!write_sg) {
 434                 pr_err("Unable to allocate compare_and_write sg\n");
 435                 ret = TCM_OUT_OF_RESOURCES;
 436                 goto out;
 437         }
 438         sg_init_table(write_sg, cmd->t_data_nents);
 439         /*
 440          * Setup verify and write data payloads from total NumberLBAs.
 441          */
 442         rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
 443                                cmd->data_length);
 444         if (!rc) {
 445                 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
 446                 ret = TCM_OUT_OF_RESOURCES;
 447                 goto out;
 448         }
 449         /*
 450          * Compare against SCSI READ payload against verify payload
 451          */
 452         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
 453                 addr = (unsigned char *)kmap_atomic(sg_page(sg));
 454                 if (!addr) {
 455                         ret = TCM_OUT_OF_RESOURCES;
 456                         goto out;
 457                 }
 458
 459                 len = min(sg->length, compare_len);
 460
 461                 if (memcmp(addr, buf + offset, len)) {
 462                         pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
 463                                 addr, buf + offset);
 464                         kunmap_atomic(addr);
 465                         goto miscompare;
 466                 }
 467                 kunmap_atomic(addr);
 468
 469                 offset += len;
 470                 compare_len -= len;
 471                 if (!compare_len)
 472                         break;
 473         }
 474
 475         i = 0;
 476         len = cmd->t_task_nolb * block_size;
 477         sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
 478         /*
 479          * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
 480          */
 481         while (len) {
 482                 sg_miter_next(&m);
 483
 484                 if (block_size < PAGE_SIZE) {
 485                         sg_set_page(&write_sg[i], m.page, block_size,
 486                                     block_size);
 487                 } else {
 488                         sg_miter_next(&m);
 489                         sg_set_page(&write_sg[i], m.page, block_size,
 490                                     0);
 491                 }
 492                 len -= block_size;
 493                 i++;
 494         }
 495         sg_miter_stop(&m);
 496         /*
 497          * Save the original SGL + nents values before updating to new
 498          * assignments, to be released in transport_free_pages() ->
 499          * transport_reset_sgl_orig()
 500          */
 501         cmd->t_data_sg_orig = cmd->t_data_sg;
 502         cmd->t_data_sg = write_sg;
 503         cmd->t_data_nents_orig = cmd->t_data_nents;
 504         cmd->t_data_nents = 1;
 505
 506         cmd->sam_task_attr = MSG_HEAD_TAG;
 507         cmd->transport_complete_callback = compare_and_write_post;
 508         /*
 509          * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
 510          * for submitting the adjusted SGL to write instance user-data.
 511          */
 512         cmd->execute_cmd = sbc_execute_rw;
 513
 514         spin_lock_irq(&cmd->t_state_lock);
 515         cmd->t_state = TRANSPORT_PROCESSING;
 516         cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
 517         spin_unlock_irq(&cmd->t_state_lock);
 518
 519         __target_execute_cmd(cmd);
 520
 521         kfree(buf);
 522         return ret;
 523
 524 miscompare:
 525         pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
 526                 dev->transport->name);
 527         ret = TCM_MISCOMPARE_VERIFY;
 528 out:
 529         /*
 530          * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
 531          * sbc_compare_and_write() before the original READ I/O submission.
 532          */
 533         up(&dev->caw_sem);
 534         kfree(write_sg);
 535         kfree(buf);
 536         return ret;
 537 }
 538
 539 static sense_reason_t
 540 sbc_compare_and_write(struct se_cmd *cmd)
 541 {
 542         struct se_device *dev = cmd->se_dev;
 543         sense_reason_t ret;
 544         int rc;
 545         /*
 546          * Submit the READ first for COMPARE_AND_WRITE to perform the
 547          * comparision using SGLs at cmd->t_bidi_data_sg..
 548          */
 549         rc = down_interruptible(&dev->caw_sem);
 550         if ((rc != 0) || signal_pending(current)) {
 551                 cmd->transport_complete_callback = NULL;
 552                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 553         }
 554         /*
 555          * Reset cmd->data_length to individual block_size in order to not
 556          * confuse backend drivers that depend on this value matching the
 557          * size of the I/O being submitted.
 558          */
 559         cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
 560
 561         ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
 562                               DMA_FROM_DEVICE);
 563         if (ret) {
 564                 cmd->transport_complete_callback = NULL;
 565                 up(&dev->caw_sem);
 566                 return ret;
 567         }
 568         /*
 569          * Unlock of dev->caw_sem to occur in compare_and_write_callback()
 570          * upon MISCOMPARE, or in compare_and_write_done() upon completion
 571          * of WRITE instance user-data.
 572          */
 573         return TCM_NO_SENSE;
 574 }
 575
 576 static int
 577 sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type,
 578                        bool is_write, struct se_cmd *cmd)
 579 {
 580         if (is_write) {
 581                 cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS :
 582                                          TARGET_PROT_DOUT_INSERT;
 583                 switch (protect) {
 584                 case 0x0:
 585                 case 0x3:
 586                         cmd->prot_checks = 0;
 587                         break;
 588                 case 0x1:
 589                 case 0x5:
 590                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 591                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 592                                 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
 593                         break;
 594                 case 0x2:
 595                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 596                                 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
 597                         break;
 598                 case 0x4:
 599                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 600                         break;
 601                 default:
 602                         pr_err("Unsupported protect field %d\n", protect);
 603                         return -EINVAL;
 604                 }
 605         } else {
 606                 cmd->prot_op = protect ? TARGET_PROT_DIN_PASS :
 607                                          TARGET_PROT_DIN_STRIP;
 608                 switch (protect) {
 609                 case 0x0:
 610                 case 0x1:
 611                 case 0x5:
 612                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 613                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 614                                 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
 615                         break;
 616                 case 0x2:
 617                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 618                                 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
 619                         break;
 620                 case 0x3:
 621                         cmd->prot_checks = 0;
 622                         break;
 623                 case 0x4:
 624                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 625                         break;
 626                 default:
 627                         pr_err("Unsupported protect field %d\n", protect);
 628                         return -EINVAL;
 629                 }
 630         }
 631
 632         return 0;
 633 }
 634
 635 static bool
 636 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
 637                u32 sectors, bool is_write)
 638 {
 639         u8 protect = cdb[1] >> 5;
 640
 641         if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto)
 642                 return true;
 643
 644         switch (dev->dev_attrib.pi_prot_type) {
 645         case TARGET_DIF_TYPE3_PROT:
 646                 cmd->reftag_seed = 0xffffffff;
 647                 break;
 648         case TARGET_DIF_TYPE2_PROT:
 649                 if (protect)
 650                         return false;
 651
 652                 cmd->reftag_seed = cmd->t_task_lba;
 653                 break;
 654         case TARGET_DIF_TYPE1_PROT:
 655                 cmd->reftag_seed = cmd->t_task_lba;
 656                 break;
 657         case TARGET_DIF_TYPE0_PROT:
 658         default:
 659                 return true;
 660         }
 661
 662         if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type,
 663                                    is_write, cmd))
 664                 return false;
 665
 666         cmd->prot_type = dev->dev_attrib.pi_prot_type;
 667         cmd->prot_length = dev->prot_length * sectors;
 668         pr_debug("%s: prot_type=%d, prot_length=%d prot_op=%d prot_checks=%d\n",
 669                  __func__, cmd->prot_type, cmd->prot_length,
 670                  cmd->prot_op, cmd->prot_checks);
 671
 672         return true;
 673 }
 674
 675 sense_reason_t
 676 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 677 {
 678         struct se_device *dev = cmd->se_dev;
 679         unsigned char *cdb = cmd->t_task_cdb;
 680         unsigned int size;
 681         u32 sectors = 0;
 682         sense_reason_t ret;
 683
 684         switch (cdb[0]) {
 685         case READ_6:
 686                 sectors = transport_get_sectors_6(cdb);
 687                 cmd->t_task_lba = transport_lba_21(cdb);
 688                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 689                 cmd->execute_rw = ops->execute_rw;
 690                 cmd->execute_cmd = sbc_execute_rw;
 691                 break;
 692         case READ_10:
 693                 sectors = transport_get_sectors_10(cdb);
 694                 cmd->t_task_lba = transport_lba_32(cdb);
 695
 696                 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
 697                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 698
 699                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 700                 cmd->execute_rw = ops->execute_rw;
 701                 cmd->execute_cmd = sbc_execute_rw;
 702                 break;
 703         case READ_12:
 704                 sectors = transport_get_sectors_12(cdb);
 705                 cmd->t_task_lba = transport_lba_32(cdb);
 706
 707                 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
 708                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 709
 710                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 711                 cmd->execute_rw = ops->execute_rw;
 712                 cmd->execute_cmd = sbc_execute_rw;
 713                 break;
 714         case READ_16:
 715                 sectors = transport_get_sectors_16(cdb);
 716                 cmd->t_task_lba = transport_lba_64(cdb);
 717
 718                 if (!sbc_check_prot(dev, cmd, cdb, sectors, false))
 719                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 720
 721                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 722                 cmd->execute_rw = ops->execute_rw;
 723                 cmd->execute_cmd = sbc_execute_rw;
 724                 break;
 725         case WRITE_6:
 726                 sectors = transport_get_sectors_6(cdb);
 727                 cmd->t_task_lba = transport_lba_21(cdb);
 728                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 729                 cmd->execute_rw = ops->execute_rw;
 730                 cmd->execute_cmd = sbc_execute_rw;
 731                 break;
 732         case WRITE_10:
 733         case WRITE_VERIFY:
 734                 sectors = transport_get_sectors_10(cdb);
 735                 cmd->t_task_lba = transport_lba_32(cdb);
 736
 737                 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
 738                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 739
 740                 if (cdb[1] & 0x8)
 741                         cmd->se_cmd_flags |= SCF_FUA;
 742                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 743                 cmd->execute_rw = ops->execute_rw;
 744                 cmd->execute_cmd = sbc_execute_rw;
 745                 break;
 746         case WRITE_12:
 747                 sectors = transport_get_sectors_12(cdb);
 748                 cmd->t_task_lba = transport_lba_32(cdb);
 749
 750                 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
 751                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 752
 753                 if (cdb[1] & 0x8)
 754                         cmd->se_cmd_flags |= SCF_FUA;
 755                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 756                 cmd->execute_rw = ops->execute_rw;
 757                 cmd->execute_cmd = sbc_execute_rw;
 758                 break;
 759         case WRITE_16:
 760                 sectors = transport_get_sectors_16(cdb);
 761                 cmd->t_task_lba = transport_lba_64(cdb);
 762
 763                 if (!sbc_check_prot(dev, cmd, cdb, sectors, true))
 764                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 765
 766                 if (cdb[1] & 0x8)
 767                         cmd->se_cmd_flags |= SCF_FUA;
 768                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 769                 cmd->execute_rw = ops->execute_rw;
 770                 cmd->execute_cmd = sbc_execute_rw;
 771                 break;
 772         case XDWRITEREAD_10:
 773                 if (cmd->data_direction != DMA_TO_DEVICE ||
 774                     !(cmd->se_cmd_flags & SCF_BIDI))
 775                         return TCM_INVALID_CDB_FIELD;
 776                 sectors = transport_get_sectors_10(cdb);
 777
 778                 cmd->t_task_lba = transport_lba_32(cdb);
 779                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 780
 781                 /*
 782                  * Setup BIDI XOR callback to be run after I/O completion.
 783                  */
 784                 cmd->execute_rw = ops->execute_rw;
 785                 cmd->execute_cmd = sbc_execute_rw;
 786                 cmd->transport_complete_callback = &xdreadwrite_callback;
 787                 if (cdb[1] & 0x8)
 788                         cmd->se_cmd_flags |= SCF_FUA;
 789                 break;
 790         case VARIABLE_LENGTH_CMD:
 791         {
 792                 u16 service_action = get_unaligned_be16(&cdb[8]);
 793                 switch (service_action) {
 794                 case XDWRITEREAD_32:
 795                         sectors = transport_get_sectors_32(cdb);
 796
 797                         /*
 798                          * Use WRITE_32 and READ_32 opcodes for the emulated
 799                          * XDWRITE_READ_32 logic.
 800                          */
 801                         cmd->t_task_lba = transport_lba_64_ext(cdb);
 802                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 803
 804                         /*
 805                          * Setup BIDI XOR callback to be run during after I/O
 806                          * completion.
 807                          */
 808                         cmd->execute_rw = ops->execute_rw;
 809                         cmd->execute_cmd = sbc_execute_rw;
 810                         cmd->transport_complete_callback = &xdreadwrite_callback;
 811                         if (cdb[1] & 0x8)
 812                                 cmd->se_cmd_flags |= SCF_FUA;
 813                         break;
 814                 case WRITE_SAME_32:
 815                         sectors = transport_get_sectors_32(cdb);
 816                         if (!sectors) {
 817                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
 818                                        " supported\n");
 819                                 return TCM_INVALID_CDB_FIELD;
 820                         }
 821
 822                         size = sbc_get_size(cmd, 1);
 823                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 824
 825                         ret = sbc_setup_write_same(cmd, &cdb[10], ops);
 826                         if (ret)
 827                                 return ret;
 828                         break;
 829                 default:
 830                         pr_err("VARIABLE_LENGTH_CMD service action"
 831                                 " 0x%04x not supported\n", service_action);
 832                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 833                 }
 834                 break;
 835         }
 836         case COMPARE_AND_WRITE:
 837                 sectors = cdb[13];
 838                 /*
 839                  * Currently enforce COMPARE_AND_WRITE for a single sector
 840                  */
 841                 if (sectors > 1) {
 842                         pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
 843                                " than 1\n", sectors);
 844                         return TCM_INVALID_CDB_FIELD;
 845                 }
 846                 /*
 847                  * Double size because we have two buffers, note that
 848                  * zero is not an error..
 849                  */
 850                 size = 2 * sbc_get_size(cmd, sectors);
 851                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 852                 cmd->t_task_nolb = sectors;
 853                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
 854                 cmd->execute_rw = ops->execute_rw;
 855                 cmd->execute_cmd = sbc_compare_and_write;
 856                 cmd->transport_complete_callback = compare_and_write_callback;
 857                 break;
 858         case READ_CAPACITY:
 859                 size = READ_CAP_LEN;
 860                 cmd->execute_cmd = sbc_emulate_readcapacity;
 861                 break;
 862         case SERVICE_ACTION_IN:
 863                 switch (cmd->t_task_cdb[1] & 0x1f) {
 864                 case SAI_READ_CAPACITY_16:
 865                         cmd->execute_cmd = sbc_emulate_readcapacity_16;
 866                         break;
 867                 case SAI_REPORT_REFERRALS:
 868                         cmd->execute_cmd = target_emulate_report_referrals;
 869                         break;
 870                 default:
 871                         pr_err("Unsupported SA: 0x%02x\n",
 872                                 cmd->t_task_cdb[1] & 0x1f);
 873                         return TCM_INVALID_CDB_FIELD;
 874                 }
 875                 size = (cdb[10] << 24) | (cdb[11] << 16) |
 876                        (cdb[12] << 8) | cdb[13];
 877                 break;
 878         case SYNCHRONIZE_CACHE:
 879         case SYNCHRONIZE_CACHE_16:
 880                 if (!ops->execute_sync_cache) {
 881                         size = 0;
 882                         cmd->execute_cmd = sbc_emulate_noop;
 883                         break;
 884                 }
 885
 886                 /*
 887                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
 888                  */
 889                 if (cdb[0] == SYNCHRONIZE_CACHE) {
 890                         sectors = transport_get_sectors_10(cdb);
 891                         cmd->t_task_lba = transport_lba_32(cdb);
 892                 } else {
 893                         sectors = transport_get_sectors_16(cdb);
 894                         cmd->t_task_lba = transport_lba_64(cdb);
 895                 }
 896
 897                 size = sbc_get_size(cmd, sectors);
 898
 899                 /*
 900                  * Check to ensure that LBA + Range does not exceed past end of
 901                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
 902                  */
 903                 if (cmd->t_task_lba || sectors) {
 904                         if (sbc_check_valid_sectors(cmd) < 0)
 905                                 return TCM_ADDRESS_OUT_OF_RANGE;
 906                 }
 907                 cmd->execute_cmd = ops->execute_sync_cache;
 908                 break;
 909         case UNMAP:
 910                 if (!ops->execute_unmap)
 911                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 912
 913                 size = get_unaligned_be16(&cdb[7]);
 914                 cmd->execute_cmd = ops->execute_unmap;
 915                 break;
 916         case WRITE_SAME_16:
 917                 sectors = transport_get_sectors_16(cdb);
 918                 if (!sectors) {
 919                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 920                         return TCM_INVALID_CDB_FIELD;
 921                 }
 922
 923                 size = sbc_get_size(cmd, 1);
 924                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 925
 926                 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
 927                 if (ret)
 928                         return ret;
 929                 break;
 930         case WRITE_SAME:
 931                 sectors = transport_get_sectors_10(cdb);
 932                 if (!sectors) {
 933                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
 934                         return TCM_INVALID_CDB_FIELD;
 935                 }
 936
 937                 size = sbc_get_size(cmd, 1);
 938                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
 939
 940                 /*
 941                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
 942                  * of byte 1 bit 3 UNMAP instead of original reserved field
 943                  */
 944                 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
 945                 if (ret)
 946                         return ret;
 947                 break;
 948         case VERIFY:
 949                 size = 0;
 950                 cmd->execute_cmd = sbc_emulate_noop;
 951                 break;
 952         case REZERO_UNIT:
 953         case SEEK_6:
 954         case SEEK_10:
 955                 /*
 956                  * There are still clients out there which use these old SCSI-2
 957                  * commands. This mainly happens when running VMs with legacy
 958                  * guest systems, connected via SCSI command pass-through to
 959                  * iSCSI targets. Make them happy and return status GOOD.
 960                  */
 961                 size = 0;
 962                 cmd->execute_cmd = sbc_emulate_noop;
 963                 break;
 964         default:
 965                 ret = spc_parse_cdb(cmd, &size);
 966                 if (ret)
 967                         return ret;
 968         }
 969
 970         /* reject any command that we don't have a handler for */
 971         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
 972                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 973
 974         if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
 975                 unsigned long long end_lba;
 976
 977                 if (sectors > dev->dev_attrib.fabric_max_sectors) {
 978                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 979                                 " big sectors %u exceeds fabric_max_sectors:"
 980                                 " %u\n", cdb[0], sectors,
 981                                 dev->dev_attrib.fabric_max_sectors);
 982                         return TCM_INVALID_CDB_FIELD;
 983                 }
 984                 if (sectors > dev->dev_attrib.hw_max_sectors) {
 985                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
 986                                 " big sectors %u exceeds backend hw_max_sectors:"
 987                                 " %u\n", cdb[0], sectors,
 988                                 dev->dev_attrib.hw_max_sectors);
 989                         return TCM_INVALID_CDB_FIELD;
 990                 }
 991
 992                 end_lba = dev->transport->get_blocks(dev) + 1;
 993                 if (cmd->t_task_lba + sectors > end_lba) {
 994                         pr_err("cmd exceeds last lba %llu "
 995                                 "(lba %llu, sectors %u)\n",
 996                                 end_lba, cmd->t_task_lba, sectors);
 997                         return TCM_ADDRESS_OUT_OF_RANGE;
 998                 }
 999
1000                 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1001                         size = sbc_get_size(cmd, sectors);
1002         }
1003
1004         return target_cmd_size_check(cmd, size);
1005 }
1006 EXPORT_SYMBOL(sbc_parse_cdb);
1007
1008 u32 sbc_get_device_type(struct se_device *dev)
1009 {
1010         return TYPE_DISK;
1011 }
1012 EXPORT_SYMBOL(sbc_get_device_type);
1013
1014 sense_reason_t
1015 sbc_execute_unmap(struct se_cmd *cmd,
1016         sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1017                                       sector_t, sector_t),
1018         void *priv)
1019 {
1020         struct se_device *dev = cmd->se_dev;
1021         unsigned char *buf, *ptr = NULL;
1022         sector_t lba;
1023         int size;
1024         u32 range;
1025         sense_reason_t ret = 0;
1026         int dl, bd_dl;
1027
1028         /* We never set ANC_SUP */
1029         if (cmd->t_task_cdb[1])
1030                 return TCM_INVALID_CDB_FIELD;
1031
1032         if (cmd->data_length == 0) {
1033                 target_complete_cmd(cmd, SAM_STAT_GOOD);
1034                 return 0;
1035         }
1036
1037         if (cmd->data_length < 8) {
1038                 pr_warn("UNMAP parameter list length %u too small\n",
1039                         cmd->data_length);
1040                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1041         }
1042
1043         buf = transport_kmap_data_sg(cmd);
1044         if (!buf)
1045                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1046
1047         dl = get_unaligned_be16(&buf[0]);
1048         bd_dl = get_unaligned_be16(&buf[2]);
1049
1050         size = cmd->data_length - 8;
1051         if (bd_dl > size)
1052                 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1053                         cmd->data_length, bd_dl);
1054         else
1055                 size = bd_dl;
1056
1057         if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1058                 ret = TCM_INVALID_PARAMETER_LIST;
1059                 goto err;
1060         }
1061
1062         /* First UNMAP block descriptor starts at 8 byte offset */
1063         ptr = &buf[8];
1064         pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1065                 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1066
1067         while (size >= 16) {
1068                 lba = get_unaligned_be64(&ptr[0]);
1069                 range = get_unaligned_be32(&ptr[8]);
1070                 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1071                                  (unsigned long long)lba, range);
1072
1073                 if (range > dev->dev_attrib.max_unmap_lba_count) {
1074                         ret = TCM_INVALID_PARAMETER_LIST;
1075                         goto err;
1076                 }
1077
1078                 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1079                         ret = TCM_ADDRESS_OUT_OF_RANGE;
1080                         goto err;
1081                 }
1082
1083                 ret = do_unmap_fn(cmd, priv, lba, range);
1084                 if (ret)
1085                         goto err;
1086
1087                 ptr += 16;
1088                 size -= 16;
1089         }
1090
1091 err:
1092         transport_kunmap_data_sg(cmd);
1093         if (!ret)
1094                 target_complete_cmd(cmd, GOOD);
1095         return ret;
1096 }
1097 EXPORT_SYMBOL(sbc_execute_unmap);
1098
1099 void
1100 sbc_dif_generate(struct se_cmd *cmd)
1101 {
1102         struct se_device *dev = cmd->se_dev;
1103         struct se_dif_v1_tuple *sdt;
1104         struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1105         sector_t sector = cmd->t_task_lba;
1106         void *daddr, *paddr;
1107         int i, j, offset = 0;
1108
1109         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1110                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1111                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1112
1113                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1114
1115                         if (offset >= psg->length) {
1116                                 kunmap_atomic(paddr);
1117                                 psg = sg_next(psg);
1118                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1119                                 offset = 0;
1120                         }
1121
1122                         sdt = paddr + offset;
1123                         sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1124                                                 dev->dev_attrib.block_size));
1125                         if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
1126                                 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1127                         sdt->app_tag = 0;
1128
1129                         pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x"
1130                                  " app_tag: 0x%04x ref_tag: %u\n",
1131                                  (unsigned long long)sector, sdt->guard_tag,
1132                                  sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1133
1134                         sector++;
1135                         offset += sizeof(struct se_dif_v1_tuple);
1136                 }
1137
1138                 kunmap_atomic(paddr);
1139                 kunmap_atomic(daddr);
1140         }
1141 }
1142
1143 static sense_reason_t
1144 sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt,
1145                   const void *p, sector_t sector, unsigned int ei_lba)
1146 {
1147         int block_size = dev->dev_attrib.block_size;
1148         __be16 csum;
1149
1150         csum = cpu_to_be16(crc_t10dif(p, block_size));
1151
1152         if (sdt->guard_tag != csum) {
1153                 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1154                         " csum 0x%04x\n", (unsigned long long)sector,
1155                         be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1156                 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1157         }
1158
1159         if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT &&
1160             be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1161                 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1162                        " sector MSB: 0x%08x\n", (unsigned long long)sector,
1163                        be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1164                 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1165         }
1166
1167         if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT &&
1168             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1169                 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1170                        " ei_lba: 0x%08x\n", (unsigned long long)sector,
1171                         be32_to_cpu(sdt->ref_tag), ei_lba);
1172                 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1173         }
1174
1175         return 0;
1176 }
1177
1178 static void
1179 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1180                   struct scatterlist *sg, int sg_off)
1181 {
1182         struct se_device *dev = cmd->se_dev;
1183         struct scatterlist *psg;
1184         void *paddr, *addr;
1185         unsigned int i, len, left;
1186         unsigned int offset = sg_off;
1187
1188         left = sectors * dev->prot_length;
1189
1190         for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1191                 unsigned int psg_len, copied = 0;
1192
1193                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1194                 psg_len = min(left, psg->length);
1195                 while (psg_len) {
1196                         len = min(psg_len, sg->length - offset);
1197                         addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1198
1199                         if (read)
1200                                 memcpy(paddr + copied, addr, len);
1201                         else
1202                                 memcpy(addr, paddr + copied, len);
1203
1204                         left -= len;
1205                         offset += len;
1206                         copied += len;
1207                         psg_len -= len;
1208
1209                         if (offset >= sg->length) {
1210                                 sg = sg_next(sg);
1211                                 offset = 0;
1212                         }
1213                         kunmap_atomic(addr);
1214                 }
1215                 kunmap_atomic(paddr);
1216         }
1217 }
1218
1219 sense_reason_t
1220 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1221                      unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1222 {
1223         struct se_device *dev = cmd->se_dev;
1224         struct se_dif_v1_tuple *sdt;
1225         struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1226         sector_t sector = start;
1227         void *daddr, *paddr;
1228         int i, j, offset = 0;
1229         sense_reason_t rc;
1230
1231         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1232                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1233                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1234
1235                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1236
1237                         if (offset >= psg->length) {
1238                                 kunmap_atomic(paddr);
1239                                 psg = sg_next(psg);
1240                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1241                                 offset = 0;
1242                         }
1243
1244                         sdt = paddr + offset;
1245
1246                         pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1247                                  " app_tag: 0x%04x ref_tag: %u\n",
1248                                  (unsigned long long)sector, sdt->guard_tag,
1249                                  sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1250
1251                         rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1252                                                ei_lba);
1253                         if (rc) {
1254                                 kunmap_atomic(paddr);
1255                                 kunmap_atomic(daddr);
1256                                 cmd->bad_sector = sector;
1257                                 return rc;
1258                         }
1259
1260                         sector++;
1261                         ei_lba++;
1262                         offset += sizeof(struct se_dif_v1_tuple);
1263                 }
1264
1265                 kunmap_atomic(paddr);
1266                 kunmap_atomic(daddr);
1267         }
1268         sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1269
1270         return 0;
1271 }
1272 EXPORT_SYMBOL(sbc_dif_verify_write);
1273
1274 static sense_reason_t
1275 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1276                       unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1277 {
1278         struct se_device *dev = cmd->se_dev;
1279         struct se_dif_v1_tuple *sdt;
1280         struct scatterlist *dsg, *psg = sg;
1281         sector_t sector = start;
1282         void *daddr, *paddr;
1283         int i, j, offset = sg_off;
1284         sense_reason_t rc;
1285
1286         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1287                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1288                 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1289
1290                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1291
1292                         if (offset >= psg->length) {
1293                                 kunmap_atomic(paddr);
1294                                 psg = sg_next(psg);
1295                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1296                                 offset = 0;
1297                         }
1298
1299                         sdt = paddr + offset;
1300
1301                         pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1302                                  " app_tag: 0x%04x ref_tag: %u\n",
1303                                  (unsigned long long)sector, sdt->guard_tag,
1304                                  sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1305
1306                         if (sdt->app_tag == cpu_to_be16(0xffff)) {
1307                                 sector++;
1308                                 offset += sizeof(struct se_dif_v1_tuple);
1309                                 continue;
1310                         }
1311
1312                         rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector,
1313                                                ei_lba);
1314                         if (rc) {
1315                                 kunmap_atomic(paddr);
1316                                 kunmap_atomic(daddr);
1317                                 cmd->bad_sector = sector;
1318                                 return rc;
1319                         }
1320
1321                         sector++;
1322                         ei_lba++;
1323                         offset += sizeof(struct se_dif_v1_tuple);
1324                 }
1325
1326                 kunmap_atomic(paddr);
1327                 kunmap_atomic(daddr);
1328         }
1329
1330         return 0;
1331 }
1332
1333 sense_reason_t
1334 sbc_dif_read_strip(struct se_cmd *cmd)
1335 {
1336         struct se_device *dev = cmd->se_dev;
1337         u32 sectors = cmd->prot_length / dev->prot_length;
1338
1339         return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1340                                      cmd->t_prot_sg, 0);
1341 }
1342
1343 sense_reason_t
1344 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1345                     unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1346 {
1347         sense_reason_t rc;
1348
1349         rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1350         if (rc)
1351                 return rc;
1352
1353         sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1354         return 0;
1355 }
1356 EXPORT_SYMBOL(sbc_dif_verify_read);