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_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool);
  41
  42 static sense_reason_t
  43 sbc_emulate_readcapacity(struct se_cmd *cmd)
  44 {
  45         struct se_device *dev = cmd->se_dev;
  46         unsigned char *cdb = cmd->t_task_cdb;
  47         unsigned long long blocks_long = dev->transport->get_blocks(dev);
  48         unsigned char *rbuf;
  49         unsigned char buf[8];
  50         u32 blocks;
  51
  52         /*
  53          * SBC-2 says:
  54          *   If the PMI bit is set to zero and the LOGICAL BLOCK
  55          *   ADDRESS field is not set to zero, the device server shall
  56          *   terminate the command with CHECK CONDITION status with
  57          *   the sense key set to ILLEGAL REQUEST and the additional
  58          *   sense code set to INVALID FIELD IN CDB.
  59          *
  60          * In SBC-3, these fields are obsolete, but some SCSI
  61          * compliance tests actually check this, so we might as well
  62          * follow SBC-2.
  63          */
  64         if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
  65                 return TCM_INVALID_CDB_FIELD;
  66
  67         if (blocks_long >= 0x00000000ffffffff)
  68                 blocks = 0xffffffff;
  69         else
  70                 blocks = (u32)blocks_long;
  71
  72         buf[0] = (blocks >> 24) & 0xff;
  73         buf[1] = (blocks >> 16) & 0xff;
  74         buf[2] = (blocks >> 8) & 0xff;
  75         buf[3] = blocks & 0xff;
  76         buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
  77         buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
  78         buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
  79         buf[7] = dev->dev_attrib.block_size & 0xff;
  80
  81         rbuf = transport_kmap_data_sg(cmd);
  82         if (rbuf) {
  83                 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
  84                 transport_kunmap_data_sg(cmd);
  85         }
  86
  87         target_complete_cmd_with_length(cmd, GOOD, 8);
  88         return 0;
  89 }
  90
  91 static sense_reason_t
  92 sbc_emulate_readcapacity_16(struct se_cmd *cmd)
  93 {
  94         struct se_device *dev = cmd->se_dev;
  95         struct se_session *sess = cmd->se_sess;
  96         int pi_prot_type = dev->dev_attrib.pi_prot_type;
  97
  98         unsigned char *rbuf;
  99         unsigned char buf[32];
 100         unsigned long long blocks = dev->transport->get_blocks(dev);
 101
 102         memset(buf, 0, sizeof(buf));
 103         buf[0] = (blocks >> 56) & 0xff;
 104         buf[1] = (blocks >> 48) & 0xff;
 105         buf[2] = (blocks >> 40) & 0xff;
 106         buf[3] = (blocks >> 32) & 0xff;
 107         buf[4] = (blocks >> 24) & 0xff;
 108         buf[5] = (blocks >> 16) & 0xff;
 109         buf[6] = (blocks >> 8) & 0xff;
 110         buf[7] = blocks & 0xff;
 111         buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
 112         buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
 113         buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
 114         buf[11] = dev->dev_attrib.block_size & 0xff;
 115         /*
 116          * Set P_TYPE and PROT_EN bits for DIF support
 117          */
 118         if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
 119                 /*
 120                  * Only override a device's pi_prot_type if no T10-PI is
 121                  * available, and sess_prot_type has been explicitly enabled.
 122                  */
 123                 if (!pi_prot_type)
 124                         pi_prot_type = sess->sess_prot_type;
 125
 126                 if (pi_prot_type)
 127                         buf[12] = (pi_prot_type - 1) << 1 | 0x1;
 128         }
 129
 130         if (dev->transport->get_lbppbe)
 131                 buf[13] = dev->transport->get_lbppbe(dev) & 0x0f;
 132
 133         if (dev->transport->get_alignment_offset_lbas) {
 134                 u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
 135                 buf[14] = (lalba >> 8) & 0x3f;
 136                 buf[15] = lalba & 0xff;
 137         }
 138
 139         /*
 140          * Set Thin Provisioning Enable bit following sbc3r22 in section
 141          * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
 142          */
 143         if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
 144                 buf[14] |= 0x80;
 145
 146         rbuf = transport_kmap_data_sg(cmd);
 147         if (rbuf) {
 148                 memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
 149                 transport_kunmap_data_sg(cmd);
 150         }
 151
 152         target_complete_cmd_with_length(cmd, GOOD, 32);
 153         return 0;
 154 }
 155
 156 sector_t sbc_get_write_same_sectors(struct se_cmd *cmd)
 157 {
 158         u32 num_blocks;
 159
 160         if (cmd->t_task_cdb[0] == WRITE_SAME)
 161                 num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
 162         else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
 163                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
 164         else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
 165                 num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
 166
 167         /*
 168          * Use the explicit range when non zero is supplied, otherwise calculate
 169          * the remaining range based on ->get_blocks() - starting LBA.
 170          */
 171         if (num_blocks)
 172                 return num_blocks;
 173
 174         return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
 175                 cmd->t_task_lba + 1;
 176 }
 177 EXPORT_SYMBOL(sbc_get_write_same_sectors);
 178
 179 static sense_reason_t
 180 sbc_emulate_noop(struct se_cmd *cmd)
 181 {
 182         target_complete_cmd(cmd, GOOD);
 183         return 0;
 184 }
 185
 186 static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
 187 {
 188         return cmd->se_dev->dev_attrib.block_size * sectors;
 189 }
 190
 191 static inline u32 transport_get_sectors_6(unsigned char *cdb)
 192 {
 193         /*
 194          * Use 8-bit sector value.  SBC-3 says:
 195          *
 196          *   A TRANSFER LENGTH field set to zero specifies that 256
 197          *   logical blocks shall be written.  Any other value
 198          *   specifies the number of logical blocks that shall be
 199          *   written.
 200          */
 201         return cdb[4] ? : 256;
 202 }
 203
 204 static inline u32 transport_get_sectors_10(unsigned char *cdb)
 205 {
 206         return (u32)(cdb[7] << 8) + cdb[8];
 207 }
 208
 209 static inline u32 transport_get_sectors_12(unsigned char *cdb)
 210 {
 211         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
 212 }
 213
 214 static inline u32 transport_get_sectors_16(unsigned char *cdb)
 215 {
 216         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
 217                     (cdb[12] << 8) + cdb[13];
 218 }
 219
 220 /*
 221  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 222  */
 223 static inline u32 transport_get_sectors_32(unsigned char *cdb)
 224 {
 225         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
 226                     (cdb[30] << 8) + cdb[31];
 227
 228 }
 229
 230 static inline u32 transport_lba_21(unsigned char *cdb)
 231 {
 232         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
 233 }
 234
 235 static inline u32 transport_lba_32(unsigned char *cdb)
 236 {
 237         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 238 }
 239
 240 static inline unsigned long long transport_lba_64(unsigned char *cdb)
 241 {
 242         unsigned int __v1, __v2;
 243
 244         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
 245         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
 246
 247         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 248 }
 249
 250 /*
 251  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 252  */
 253 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 254 {
 255         unsigned int __v1, __v2;
 256
 257         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
 258         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
 259
 260         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
 261 }
 262
 263 static sense_reason_t
 264 sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops)
 265 {
 266         struct se_device *dev = cmd->se_dev;
 267         sector_t end_lba = dev->transport->get_blocks(dev) + 1;
 268         unsigned int sectors = sbc_get_write_same_sectors(cmd);
 269         sense_reason_t ret;
 270
 271         if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
 272                 pr_err("WRITE_SAME PBDATA and LBDATA"
 273                         " bits not supported for Block Discard"
 274                         " Emulation\n");
 275                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 276         }
 277         if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) {
 278                 pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n",
 279                         sectors, cmd->se_dev->dev_attrib.max_write_same_len);
 280                 return TCM_INVALID_CDB_FIELD;
 281         }
 282         /*
 283          * Sanity check for LBA wrap and request past end of device.
 284          */
 285         if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
 286             ((cmd->t_task_lba + sectors) > end_lba)) {
 287                 pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n",
 288                        (unsigned long long)end_lba, cmd->t_task_lba, sectors);
 289                 return TCM_ADDRESS_OUT_OF_RANGE;
 290         }
 291
 292         /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */
 293         if (flags[0] & 0x10) {
 294                 pr_warn("WRITE SAME with ANCHOR not supported\n");
 295                 return TCM_INVALID_CDB_FIELD;
 296         }
 297         /*
 298          * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting
 299          * translated into block discard requests within backend code.
 300          */
 301         if (flags[0] & 0x08) {
 302                 if (!ops->execute_write_same_unmap)
 303                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 304
 305                 if (!dev->dev_attrib.emulate_tpws) {
 306                         pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device"
 307                                " has emulate_tpws disabled\n");
 308                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 309                 }
 310                 cmd->execute_cmd = ops->execute_write_same_unmap;
 311                 return 0;
 312         }
 313         if (!ops->execute_write_same)
 314                 return TCM_UNSUPPORTED_SCSI_OPCODE;
 315
 316         ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true);
 317         if (ret)
 318                 return ret;
 319
 320         cmd->execute_cmd = ops->execute_write_same;
 321         return 0;
 322 }
 323
 324 static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success)
 325 {
 326         unsigned char *buf, *addr;
 327         struct scatterlist *sg;
 328         unsigned int offset;
 329         sense_reason_t ret = TCM_NO_SENSE;
 330         int i, count;
 331         /*
 332          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
 333          *
 334          * 1) read the specified logical block(s);
 335          * 2) transfer logical blocks from the data-out buffer;
 336          * 3) XOR the logical blocks transferred from the data-out buffer with
 337          *    the logical blocks read, storing the resulting XOR data in a buffer;
 338          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
 339          *    blocks transferred from the data-out buffer; and
 340          * 5) transfer the resulting XOR data to the data-in buffer.
 341          */
 342         buf = kmalloc(cmd->data_length, GFP_KERNEL);
 343         if (!buf) {
 344                 pr_err("Unable to allocate xor_callback buf\n");
 345                 return TCM_OUT_OF_RESOURCES;
 346         }
 347         /*
 348          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
 349          * into the locally allocated *buf
 350          */
 351         sg_copy_to_buffer(cmd->t_data_sg,
 352                           cmd->t_data_nents,
 353                           buf,
 354                           cmd->data_length);
 355
 356         /*
 357          * Now perform the XOR against the BIDI read memory located at
 358          * cmd->t_mem_bidi_list
 359          */
 360
 361         offset = 0;
 362         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
 363                 addr = kmap_atomic(sg_page(sg));
 364                 if (!addr) {
 365                         ret = TCM_OUT_OF_RESOURCES;
 366                         goto out;
 367                 }
 368
 369                 for (i = 0; i < sg->length; i++)
 370                         *(addr + sg->offset + i) ^= *(buf + offset + i);
 371
 372                 offset += sg->length;
 373                 kunmap_atomic(addr);
 374         }
 375
 376 out:
 377         kfree(buf);
 378         return ret;
 379 }
 380
 381 static sense_reason_t
 382 sbc_execute_rw(struct se_cmd *cmd)
 383 {
 384         return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents,
 385                                cmd->data_direction);
 386 }
 387
 388 static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success)
 389 {
 390         struct se_device *dev = cmd->se_dev;
 391
 392         /*
 393          * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
 394          * within target_complete_ok_work() if the command was successfully
 395          * sent to the backend driver.
 396          */
 397         spin_lock_irq(&cmd->t_state_lock);
 398         if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status)
 399                 cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
 400         spin_unlock_irq(&cmd->t_state_lock);
 401
 402         /*
 403          * Unlock ->caw_sem originally obtained during sbc_compare_and_write()
 404          * before the original READ I/O submission.
 405          */
 406         up(&dev->caw_sem);
 407
 408         return TCM_NO_SENSE;
 409 }
 410
 411 static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success)
 412 {
 413         struct se_device *dev = cmd->se_dev;
 414         struct scatterlist *write_sg = NULL, *sg;
 415         unsigned char *buf = NULL, *addr;
 416         struct sg_mapping_iter m;
 417         unsigned int offset = 0, len;
 418         unsigned int nlbas = cmd->t_task_nolb;
 419         unsigned int block_size = dev->dev_attrib.block_size;
 420         unsigned int compare_len = (nlbas * block_size);
 421         sense_reason_t ret = TCM_NO_SENSE;
 422         int rc, i;
 423
 424         /*
 425          * Handle early failure in transport_generic_request_failure(),
 426          * which will not have taken ->caw_sem yet..
 427          */
 428         if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg))
 429                 return TCM_NO_SENSE;
 430         /*
 431          * Handle special case for zero-length COMPARE_AND_WRITE
 432          */
 433         if (!cmd->data_length)
 434                 goto out;
 435         /*
 436          * Immediately exit + release dev->caw_sem if command has already
 437          * been failed with a non-zero SCSI status.
 438          */
 439         if (cmd->scsi_status) {
 440                 pr_err("compare_and_write_callback: non zero scsi_status:"
 441                         " 0x%02x\n", cmd->scsi_status);
 442                 goto out;
 443         }
 444
 445         buf = kzalloc(cmd->data_length, GFP_KERNEL);
 446         if (!buf) {
 447                 pr_err("Unable to allocate compare_and_write buf\n");
 448                 ret = TCM_OUT_OF_RESOURCES;
 449                 goto out;
 450         }
 451
 452         write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
 453                            GFP_KERNEL);
 454         if (!write_sg) {
 455                 pr_err("Unable to allocate compare_and_write sg\n");
 456                 ret = TCM_OUT_OF_RESOURCES;
 457                 goto out;
 458         }
 459         sg_init_table(write_sg, cmd->t_data_nents);
 460         /*
 461          * Setup verify and write data payloads from total NumberLBAs.
 462          */
 463         rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf,
 464                                cmd->data_length);
 465         if (!rc) {
 466                 pr_err("sg_copy_to_buffer() failed for compare_and_write\n");
 467                 ret = TCM_OUT_OF_RESOURCES;
 468                 goto out;
 469         }
 470         /*
 471          * Compare against SCSI READ payload against verify payload
 472          */
 473         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) {
 474                 addr = (unsigned char *)kmap_atomic(sg_page(sg));
 475                 if (!addr) {
 476                         ret = TCM_OUT_OF_RESOURCES;
 477                         goto out;
 478                 }
 479
 480                 len = min(sg->length, compare_len);
 481
 482                 if (memcmp(addr, buf + offset, len)) {
 483                         pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n",
 484                                 addr, buf + offset);
 485                         kunmap_atomic(addr);
 486                         goto miscompare;
 487                 }
 488                 kunmap_atomic(addr);
 489
 490                 offset += len;
 491                 compare_len -= len;
 492                 if (!compare_len)
 493                         break;
 494         }
 495
 496         i = 0;
 497         len = cmd->t_task_nolb * block_size;
 498         sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG);
 499         /*
 500          * Currently assumes NoLB=1 and SGLs are PAGE_SIZE..
 501          */
 502         while (len) {
 503                 sg_miter_next(&m);
 504
 505                 if (block_size < PAGE_SIZE) {
 506                         sg_set_page(&write_sg[i], m.page, block_size,
 507                                     block_size);
 508                 } else {
 509                         sg_miter_next(&m);
 510                         sg_set_page(&write_sg[i], m.page, block_size,
 511                                     0);
 512                 }
 513                 len -= block_size;
 514                 i++;
 515         }
 516         sg_miter_stop(&m);
 517         /*
 518          * Save the original SGL + nents values before updating to new
 519          * assignments, to be released in transport_free_pages() ->
 520          * transport_reset_sgl_orig()
 521          */
 522         cmd->t_data_sg_orig = cmd->t_data_sg;
 523         cmd->t_data_sg = write_sg;
 524         cmd->t_data_nents_orig = cmd->t_data_nents;
 525         cmd->t_data_nents = 1;
 526
 527         cmd->sam_task_attr = TCM_HEAD_TAG;
 528         cmd->transport_complete_callback = compare_and_write_post;
 529         /*
 530          * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler
 531          * for submitting the adjusted SGL to write instance user-data.
 532          */
 533         cmd->execute_cmd = sbc_execute_rw;
 534
 535         spin_lock_irq(&cmd->t_state_lock);
 536         cmd->t_state = TRANSPORT_PROCESSING;
 537         cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
 538         spin_unlock_irq(&cmd->t_state_lock);
 539
 540         __target_execute_cmd(cmd);
 541
 542         kfree(buf);
 543         return ret;
 544
 545 miscompare:
 546         pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n",
 547                 dev->transport->name);
 548         ret = TCM_MISCOMPARE_VERIFY;
 549 out:
 550         /*
 551          * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in
 552          * sbc_compare_and_write() before the original READ I/O submission.
 553          */
 554         up(&dev->caw_sem);
 555         kfree(write_sg);
 556         kfree(buf);
 557         return ret;
 558 }
 559
 560 static sense_reason_t
 561 sbc_compare_and_write(struct se_cmd *cmd)
 562 {
 563         struct se_device *dev = cmd->se_dev;
 564         sense_reason_t ret;
 565         int rc;
 566         /*
 567          * Submit the READ first for COMPARE_AND_WRITE to perform the
 568          * comparision using SGLs at cmd->t_bidi_data_sg..
 569          */
 570         rc = down_interruptible(&dev->caw_sem);
 571         if (rc != 0) {
 572                 cmd->transport_complete_callback = NULL;
 573                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 574         }
 575         /*
 576          * Reset cmd->data_length to individual block_size in order to not
 577          * confuse backend drivers that depend on this value matching the
 578          * size of the I/O being submitted.
 579          */
 580         cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size;
 581
 582         ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents,
 583                               DMA_FROM_DEVICE);
 584         if (ret) {
 585                 cmd->transport_complete_callback = NULL;
 586                 up(&dev->caw_sem);
 587                 return ret;
 588         }
 589         /*
 590          * Unlock of dev->caw_sem to occur in compare_and_write_callback()
 591          * upon MISCOMPARE, or in compare_and_write_done() upon completion
 592          * of WRITE instance user-data.
 593          */
 594         return TCM_NO_SENSE;
 595 }
 596
 597 static int
 598 sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type,
 599                        bool is_write, struct se_cmd *cmd)
 600 {
 601         if (is_write) {
 602                 cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP :
 603                                protect ? TARGET_PROT_DOUT_PASS :
 604                                TARGET_PROT_DOUT_INSERT;
 605                 switch (protect) {
 606                 case 0x0:
 607                 case 0x3:
 608                         cmd->prot_checks = 0;
 609                         break;
 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 0x4:
 621                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 622                         break;
 623                 default:
 624                         pr_err("Unsupported protect field %d\n", protect);
 625                         return -EINVAL;
 626                 }
 627         } else {
 628                 cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT :
 629                                protect ? TARGET_PROT_DIN_PASS :
 630                                TARGET_PROT_DIN_STRIP;
 631                 switch (protect) {
 632                 case 0x0:
 633                 case 0x1:
 634                 case 0x5:
 635                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 636                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 637                                 cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG;
 638                         break;
 639                 case 0x2:
 640                         if (prot_type == TARGET_DIF_TYPE1_PROT)
 641                                 cmd->prot_checks = TARGET_DIF_CHECK_REFTAG;
 642                         break;
 643                 case 0x3:
 644                         cmd->prot_checks = 0;
 645                         break;
 646                 case 0x4:
 647                         cmd->prot_checks = TARGET_DIF_CHECK_GUARD;
 648                         break;
 649                 default:
 650                         pr_err("Unsupported protect field %d\n", protect);
 651                         return -EINVAL;
 652                 }
 653         }
 654
 655         return 0;
 656 }
 657
 658 static sense_reason_t
 659 sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb,
 660                u32 sectors, bool is_write)
 661 {
 662         u8 protect = cdb[1] >> 5;
 663         int sp_ops = cmd->se_sess->sup_prot_ops;
 664         int pi_prot_type = dev->dev_attrib.pi_prot_type;
 665         bool fabric_prot = false;
 666
 667         if (!cmd->t_prot_sg || !cmd->t_prot_nents) {
 668                 if (unlikely(protect &&
 669                     !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) {
 670                         pr_err("CDB contains protect bit, but device + fabric does"
 671                                " not advertise PROTECT=1 feature bit\n");
 672                         return TCM_INVALID_CDB_FIELD;
 673                 }
 674                 if (cmd->prot_pto)
 675                         return TCM_NO_SENSE;
 676         }
 677
 678         switch (dev->dev_attrib.pi_prot_type) {
 679         case TARGET_DIF_TYPE3_PROT:
 680                 cmd->reftag_seed = 0xffffffff;
 681                 break;
 682         case TARGET_DIF_TYPE2_PROT:
 683                 if (protect)
 684                         return TCM_INVALID_CDB_FIELD;
 685
 686                 cmd->reftag_seed = cmd->t_task_lba;
 687                 break;
 688         case TARGET_DIF_TYPE1_PROT:
 689                 cmd->reftag_seed = cmd->t_task_lba;
 690                 break;
 691         case TARGET_DIF_TYPE0_PROT:
 692                 /*
 693                  * See if the fabric supports T10-PI, and the session has been
 694                  * configured to allow export PROTECT=1 feature bit with backend
 695                  * devices that don't support T10-PI.
 696                  */
 697                 fabric_prot = is_write ?
 698                               !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) :
 699                               !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT));
 700
 701                 if (fabric_prot && cmd->se_sess->sess_prot_type) {
 702                         pi_prot_type = cmd->se_sess->sess_prot_type;
 703                         break;
 704                 }
 705                 if (!protect)
 706                         return TCM_NO_SENSE;
 707                 /* Fallthrough */
 708         default:
 709                 pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
 710                        "PROTECT: 0x%02x\n", cdb[0], protect);
 711                 return TCM_INVALID_CDB_FIELD;
 712         }
 713
 714         if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd))
 715                 return TCM_INVALID_CDB_FIELD;
 716
 717         cmd->prot_type = pi_prot_type;
 718         cmd->prot_length = dev->prot_length * sectors;
 719
 720         /**
 721          * In case protection information exists over the wire
 722          * we modify command data length to describe pure data.
 723          * The actual transfer length is data length + protection
 724          * length
 725          **/
 726         if (protect)
 727                 cmd->data_length = sectors * dev->dev_attrib.block_size;
 728
 729         pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d "
 730                  "prot_op=%d prot_checks=%d\n",
 731                  __func__, cmd->prot_type, cmd->data_length, cmd->prot_length,
 732                  cmd->prot_op, cmd->prot_checks);
 733
 734         return TCM_NO_SENSE;
 735 }
 736
 737 static int
 738 sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb)
 739 {
 740         if (cdb[1] & 0x10) {
 741                 if (!dev->dev_attrib.emulate_dpo) {
 742                         pr_err("Got CDB: 0x%02x with DPO bit set, but device"
 743                                " does not advertise support for DPO\n", cdb[0]);
 744                         return -EINVAL;
 745                 }
 746         }
 747         if (cdb[1] & 0x8) {
 748                 if (!dev->dev_attrib.emulate_fua_write || !se_dev_check_wce(dev)) {
 749                         pr_err("Got CDB: 0x%02x with FUA bit set, but device"
 750                                " does not advertise support for FUA write\n",
 751                                cdb[0]);
 752                         return -EINVAL;
 753                 }
 754                 cmd->se_cmd_flags |= SCF_FUA;
 755         }
 756         return 0;
 757 }
 758
 759 sense_reason_t
 760 sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 761 {
 762         struct se_device *dev = cmd->se_dev;
 763         unsigned char *cdb = cmd->t_task_cdb;
 764         unsigned int size;
 765         u32 sectors = 0;
 766         sense_reason_t ret;
 767
 768         switch (cdb[0]) {
 769         case READ_6:
 770                 sectors = transport_get_sectors_6(cdb);
 771                 cmd->t_task_lba = transport_lba_21(cdb);
 772                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 773                 cmd->execute_rw = ops->execute_rw;
 774                 cmd->execute_cmd = sbc_execute_rw;
 775                 break;
 776         case READ_10:
 777                 sectors = transport_get_sectors_10(cdb);
 778                 cmd->t_task_lba = transport_lba_32(cdb);
 779
 780                 if (sbc_check_dpofua(dev, cmd, cdb))
 781                         return TCM_INVALID_CDB_FIELD;
 782
 783                 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
 784                 if (ret)
 785                         return ret;
 786
 787                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 788                 cmd->execute_rw = ops->execute_rw;
 789                 cmd->execute_cmd = sbc_execute_rw;
 790                 break;
 791         case READ_12:
 792                 sectors = transport_get_sectors_12(cdb);
 793                 cmd->t_task_lba = transport_lba_32(cdb);
 794
 795                 if (sbc_check_dpofua(dev, cmd, cdb))
 796                         return TCM_INVALID_CDB_FIELD;
 797
 798                 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
 799                 if (ret)
 800                         return ret;
 801
 802                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 803                 cmd->execute_rw = ops->execute_rw;
 804                 cmd->execute_cmd = sbc_execute_rw;
 805                 break;
 806         case READ_16:
 807                 sectors = transport_get_sectors_16(cdb);
 808                 cmd->t_task_lba = transport_lba_64(cdb);
 809
 810                 if (sbc_check_dpofua(dev, cmd, cdb))
 811                         return TCM_INVALID_CDB_FIELD;
 812
 813                 ret = sbc_check_prot(dev, cmd, cdb, sectors, false);
 814                 if (ret)
 815                         return ret;
 816
 817                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 818                 cmd->execute_rw = ops->execute_rw;
 819                 cmd->execute_cmd = sbc_execute_rw;
 820                 break;
 821         case WRITE_6:
 822                 sectors = transport_get_sectors_6(cdb);
 823                 cmd->t_task_lba = transport_lba_21(cdb);
 824                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 825                 cmd->execute_rw = ops->execute_rw;
 826                 cmd->execute_cmd = sbc_execute_rw;
 827                 break;
 828         case WRITE_10:
 829         case WRITE_VERIFY:
 830                 sectors = transport_get_sectors_10(cdb);
 831                 cmd->t_task_lba = transport_lba_32(cdb);
 832
 833                 if (sbc_check_dpofua(dev, cmd, cdb))
 834                         return TCM_INVALID_CDB_FIELD;
 835
 836                 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
 837                 if (ret)
 838                         return ret;
 839
 840                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 841                 cmd->execute_rw = ops->execute_rw;
 842                 cmd->execute_cmd = sbc_execute_rw;
 843                 break;
 844         case WRITE_12:
 845                 sectors = transport_get_sectors_12(cdb);
 846                 cmd->t_task_lba = transport_lba_32(cdb);
 847
 848                 if (sbc_check_dpofua(dev, cmd, cdb))
 849                         return TCM_INVALID_CDB_FIELD;
 850
 851                 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
 852                 if (ret)
 853                         return ret;
 854
 855                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 856                 cmd->execute_rw = ops->execute_rw;
 857                 cmd->execute_cmd = sbc_execute_rw;
 858                 break;
 859         case WRITE_16:
 860                 sectors = transport_get_sectors_16(cdb);
 861                 cmd->t_task_lba = transport_lba_64(cdb);
 862
 863                 if (sbc_check_dpofua(dev, cmd, cdb))
 864                         return TCM_INVALID_CDB_FIELD;
 865
 866                 ret = sbc_check_prot(dev, cmd, cdb, sectors, true);
 867                 if (ret)
 868                         return ret;
 869
 870                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 871                 cmd->execute_rw = ops->execute_rw;
 872                 cmd->execute_cmd = sbc_execute_rw;
 873                 break;
 874         case XDWRITEREAD_10:
 875                 if (cmd->data_direction != DMA_TO_DEVICE ||
 876                     !(cmd->se_cmd_flags & SCF_BIDI))
 877                         return TCM_INVALID_CDB_FIELD;
 878                 sectors = transport_get_sectors_10(cdb);
 879
 880                 if (sbc_check_dpofua(dev, cmd, cdb))
 881                         return TCM_INVALID_CDB_FIELD;
 882
 883                 cmd->t_task_lba = transport_lba_32(cdb);
 884                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 885
 886                 /*
 887                  * Setup BIDI XOR callback to be run after I/O completion.
 888                  */
 889                 cmd->execute_rw = ops->execute_rw;
 890                 cmd->execute_cmd = sbc_execute_rw;
 891                 cmd->transport_complete_callback = &xdreadwrite_callback;
 892                 break;
 893         case VARIABLE_LENGTH_CMD:
 894         {
 895                 u16 service_action = get_unaligned_be16(&cdb[8]);
 896                 switch (service_action) {
 897                 case XDWRITEREAD_32:
 898                         sectors = transport_get_sectors_32(cdb);
 899
 900                         if (sbc_check_dpofua(dev, cmd, cdb))
 901                                 return TCM_INVALID_CDB_FIELD;
 902                         /*
 903                          * Use WRITE_32 and READ_32 opcodes for the emulated
 904                          * XDWRITE_READ_32 logic.
 905                          */
 906                         cmd->t_task_lba = transport_lba_64_ext(cdb);
 907                         cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
 908
 909                         /*
 910                          * Setup BIDI XOR callback to be run during after I/O
 911                          * completion.
 912                          */
 913                         cmd->execute_rw = ops->execute_rw;
 914                         cmd->execute_cmd = sbc_execute_rw;
 915                         cmd->transport_complete_callback = &xdreadwrite_callback;
 916                         break;
 917                 case WRITE_SAME_32:
 918                         sectors = transport_get_sectors_32(cdb);
 919                         if (!sectors) {
 920                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
 921                                        " supported\n");
 922                                 return TCM_INVALID_CDB_FIELD;
 923                         }
 924
 925                         size = sbc_get_size(cmd, 1);
 926                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 927
 928                         ret = sbc_setup_write_same(cmd, &cdb[10], ops);
 929                         if (ret)
 930                                 return ret;
 931                         break;
 932                 default:
 933                         pr_err("VARIABLE_LENGTH_CMD service action"
 934                                 " 0x%04x not supported\n", service_action);
 935                         return TCM_UNSUPPORTED_SCSI_OPCODE;
 936                 }
 937                 break;
 938         }
 939         case COMPARE_AND_WRITE:
 940                 sectors = cdb[13];
 941                 /*
 942                  * Currently enforce COMPARE_AND_WRITE for a single sector
 943                  */
 944                 if (sectors > 1) {
 945                         pr_err("COMPARE_AND_WRITE contains NoLB: %u greater"
 946                                " than 1\n", sectors);
 947                         return TCM_INVALID_CDB_FIELD;
 948                 }
 949                 /*
 950                  * Double size because we have two buffers, note that
 951                  * zero is not an error..
 952                  */
 953                 size = 2 * sbc_get_size(cmd, sectors);
 954                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 955                 cmd->t_task_nolb = sectors;
 956                 cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE;
 957                 cmd->execute_rw = ops->execute_rw;
 958                 cmd->execute_cmd = sbc_compare_and_write;
 959                 cmd->transport_complete_callback = compare_and_write_callback;
 960                 break;
 961         case READ_CAPACITY:
 962                 size = READ_CAP_LEN;
 963                 cmd->execute_cmd = sbc_emulate_readcapacity;
 964                 break;
 965         case SERVICE_ACTION_IN_16:
 966                 switch (cmd->t_task_cdb[1] & 0x1f) {
 967                 case SAI_READ_CAPACITY_16:
 968                         cmd->execute_cmd = sbc_emulate_readcapacity_16;
 969                         break;
 970                 case SAI_REPORT_REFERRALS:
 971                         cmd->execute_cmd = target_emulate_report_referrals;
 972                         break;
 973                 default:
 974                         pr_err("Unsupported SA: 0x%02x\n",
 975                                 cmd->t_task_cdb[1] & 0x1f);
 976                         return TCM_INVALID_CDB_FIELD;
 977                 }
 978                 size = (cdb[10] << 24) | (cdb[11] << 16) |
 979                        (cdb[12] << 8) | cdb[13];
 980                 break;
 981         case SYNCHRONIZE_CACHE:
 982         case SYNCHRONIZE_CACHE_16:
 983                 if (cdb[0] == SYNCHRONIZE_CACHE) {
 984                         sectors = transport_get_sectors_10(cdb);
 985                         cmd->t_task_lba = transport_lba_32(cdb);
 986                 } else {
 987                         sectors = transport_get_sectors_16(cdb);
 988                         cmd->t_task_lba = transport_lba_64(cdb);
 989                 }
 990                 if (ops->execute_sync_cache) {
 991                         cmd->execute_cmd = ops->execute_sync_cache;
 992                         goto check_lba;
 993                 }
 994                 size = 0;
 995                 cmd->execute_cmd = sbc_emulate_noop;
 996                 break;
 997         case UNMAP:
 998                 if (!ops->execute_unmap)
 999                         return TCM_UNSUPPORTED_SCSI_OPCODE;
1000
1001                 if (!dev->dev_attrib.emulate_tpu) {
1002                         pr_err("Got UNMAP, but backend device has"
1003                                " emulate_tpu disabled\n");
1004                         return TCM_UNSUPPORTED_SCSI_OPCODE;
1005                 }
1006                 size = get_unaligned_be16(&cdb[7]);
1007                 cmd->execute_cmd = ops->execute_unmap;
1008                 break;
1009         case WRITE_SAME_16:
1010                 sectors = transport_get_sectors_16(cdb);
1011                 if (!sectors) {
1012                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1013                         return TCM_INVALID_CDB_FIELD;
1014                 }
1015
1016                 size = sbc_get_size(cmd, 1);
1017                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
1018
1019                 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1020                 if (ret)
1021                         return ret;
1022                 break;
1023         case WRITE_SAME:
1024                 sectors = transport_get_sectors_10(cdb);
1025                 if (!sectors) {
1026                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
1027                         return TCM_INVALID_CDB_FIELD;
1028                 }
1029
1030                 size = sbc_get_size(cmd, 1);
1031                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
1032
1033                 /*
1034                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
1035                  * of byte 1 bit 3 UNMAP instead of original reserved field
1036                  */
1037                 ret = sbc_setup_write_same(cmd, &cdb[1], ops);
1038                 if (ret)
1039                         return ret;
1040                 break;
1041         case VERIFY:
1042                 size = 0;
1043                 sectors = transport_get_sectors_10(cdb);
1044                 cmd->t_task_lba = transport_lba_32(cdb);
1045                 cmd->execute_cmd = sbc_emulate_noop;
1046                 goto check_lba;
1047         case REZERO_UNIT:
1048         case SEEK_6:
1049         case SEEK_10:
1050                 /*
1051                  * There are still clients out there which use these old SCSI-2
1052                  * commands. This mainly happens when running VMs with legacy
1053                  * guest systems, connected via SCSI command pass-through to
1054                  * iSCSI targets. Make them happy and return status GOOD.
1055                  */
1056                 size = 0;
1057                 cmd->execute_cmd = sbc_emulate_noop;
1058                 break;
1059         default:
1060                 ret = spc_parse_cdb(cmd, &size);
1061                 if (ret)
1062                         return ret;
1063         }
1064
1065         /* reject any command that we don't have a handler for */
1066         if (!cmd->execute_cmd)
1067                 return TCM_UNSUPPORTED_SCSI_OPCODE;
1068
1069         if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1070                 unsigned long long end_lba;
1071 check_lba:
1072                 end_lba = dev->transport->get_blocks(dev) + 1;
1073                 if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) ||
1074                     ((cmd->t_task_lba + sectors) > end_lba)) {
1075                         pr_err("cmd exceeds last lba %llu "
1076                                 "(lba %llu, sectors %u)\n",
1077                                 end_lba, cmd->t_task_lba, sectors);
1078                         return TCM_ADDRESS_OUT_OF_RANGE;
1079                 }
1080
1081                 if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE))
1082                         size = sbc_get_size(cmd, sectors);
1083         }
1084
1085         return target_cmd_size_check(cmd, size);
1086 }
1087 EXPORT_SYMBOL(sbc_parse_cdb);
1088
1089 u32 sbc_get_device_type(struct se_device *dev)
1090 {
1091         return TYPE_DISK;
1092 }
1093 EXPORT_SYMBOL(sbc_get_device_type);
1094
1095 sense_reason_t
1096 sbc_execute_unmap(struct se_cmd *cmd,
1097         sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
1098                                       sector_t, sector_t),
1099         void *priv)
1100 {
1101         struct se_device *dev = cmd->se_dev;
1102         unsigned char *buf, *ptr = NULL;
1103         sector_t lba;
1104         int size;
1105         u32 range;
1106         sense_reason_t ret = 0;
1107         int dl, bd_dl;
1108
1109         /* We never set ANC_SUP */
1110         if (cmd->t_task_cdb[1])
1111                 return TCM_INVALID_CDB_FIELD;
1112
1113         if (cmd->data_length == 0) {
1114                 target_complete_cmd(cmd, SAM_STAT_GOOD);
1115                 return 0;
1116         }
1117
1118         if (cmd->data_length < 8) {
1119                 pr_warn("UNMAP parameter list length %u too small\n",
1120                         cmd->data_length);
1121                 return TCM_PARAMETER_LIST_LENGTH_ERROR;
1122         }
1123
1124         buf = transport_kmap_data_sg(cmd);
1125         if (!buf)
1126                 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1127
1128         dl = get_unaligned_be16(&buf[0]);
1129         bd_dl = get_unaligned_be16(&buf[2]);
1130
1131         size = cmd->data_length - 8;
1132         if (bd_dl > size)
1133                 pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
1134                         cmd->data_length, bd_dl);
1135         else
1136                 size = bd_dl;
1137
1138         if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
1139                 ret = TCM_INVALID_PARAMETER_LIST;
1140                 goto err;
1141         }
1142
1143         /* First UNMAP block descriptor starts at 8 byte offset */
1144         ptr = &buf[8];
1145         pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
1146                 " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
1147
1148         while (size >= 16) {
1149                 lba = get_unaligned_be64(&ptr[0]);
1150                 range = get_unaligned_be32(&ptr[8]);
1151                 pr_debug("UNMAP: Using lba: %llu and range: %u\n",
1152                                  (unsigned long long)lba, range);
1153
1154                 if (range > dev->dev_attrib.max_unmap_lba_count) {
1155                         ret = TCM_INVALID_PARAMETER_LIST;
1156                         goto err;
1157                 }
1158
1159                 if (lba + range > dev->transport->get_blocks(dev) + 1) {
1160                         ret = TCM_ADDRESS_OUT_OF_RANGE;
1161                         goto err;
1162                 }
1163
1164                 ret = do_unmap_fn(cmd, priv, lba, range);
1165                 if (ret)
1166                         goto err;
1167
1168                 ptr += 16;
1169                 size -= 16;
1170         }
1171
1172 err:
1173         transport_kunmap_data_sg(cmd);
1174         if (!ret)
1175                 target_complete_cmd(cmd, GOOD);
1176         return ret;
1177 }
1178 EXPORT_SYMBOL(sbc_execute_unmap);
1179
1180 void
1181 sbc_dif_generate(struct se_cmd *cmd)
1182 {
1183         struct se_device *dev = cmd->se_dev;
1184         struct se_dif_v1_tuple *sdt;
1185         struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1186         sector_t sector = cmd->t_task_lba;
1187         void *daddr, *paddr;
1188         int i, j, offset = 0;
1189
1190         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1191                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1192                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1193
1194                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1195
1196                         if (offset >= psg->length) {
1197                                 kunmap_atomic(paddr);
1198                                 psg = sg_next(psg);
1199                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1200                                 offset = 0;
1201                         }
1202
1203                         sdt = paddr + offset;
1204                         sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j,
1205                                                 dev->dev_attrib.block_size));
1206                         if (cmd->prot_type == TARGET_DIF_TYPE1_PROT)
1207                                 sdt->ref_tag = cpu_to_be32(sector & 0xffffffff);
1208                         sdt->app_tag = 0;
1209
1210                         pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x"
1211                                  " app_tag: 0x%04x ref_tag: %u\n",
1212                                  (cmd->data_direction == DMA_TO_DEVICE) ?
1213                                  "WRITE" : "READ", (unsigned long long)sector,
1214                                  sdt->guard_tag, sdt->app_tag,
1215                                  be32_to_cpu(sdt->ref_tag));
1216
1217                         sector++;
1218                         offset += sizeof(struct se_dif_v1_tuple);
1219                 }
1220
1221                 kunmap_atomic(paddr);
1222                 kunmap_atomic(daddr);
1223         }
1224 }
1225
1226 static sense_reason_t
1227 sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt,
1228                   const void *p, sector_t sector, unsigned int ei_lba)
1229 {
1230         struct se_device *dev = cmd->se_dev;
1231         int block_size = dev->dev_attrib.block_size;
1232         __be16 csum;
1233
1234         if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD))
1235                 goto check_ref;
1236
1237         csum = cpu_to_be16(crc_t10dif(p, block_size));
1238
1239         if (sdt->guard_tag != csum) {
1240                 pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x"
1241                         " csum 0x%04x\n", (unsigned long long)sector,
1242                         be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum));
1243                 return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1244         }
1245
1246 check_ref:
1247         if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG))
1248                 return 0;
1249
1250         if (cmd->prot_type == TARGET_DIF_TYPE1_PROT &&
1251             be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
1252                 pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x"
1253                        " sector MSB: 0x%08x\n", (unsigned long long)sector,
1254                        be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff));
1255                 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1256         }
1257
1258         if (cmd->prot_type == TARGET_DIF_TYPE2_PROT &&
1259             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1260                 pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x"
1261                        " ei_lba: 0x%08x\n", (unsigned long long)sector,
1262                         be32_to_cpu(sdt->ref_tag), ei_lba);
1263                 return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1264         }
1265
1266         return 0;
1267 }
1268
1269 static void
1270 sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read,
1271                   struct scatterlist *sg, int sg_off)
1272 {
1273         struct se_device *dev = cmd->se_dev;
1274         struct scatterlist *psg;
1275         void *paddr, *addr;
1276         unsigned int i, len, left;
1277         unsigned int offset = sg_off;
1278
1279         if (!sg)
1280                 return;
1281
1282         left = sectors * dev->prot_length;
1283
1284         for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) {
1285                 unsigned int psg_len, copied = 0;
1286
1287                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1288                 psg_len = min(left, psg->length);
1289                 while (psg_len) {
1290                         len = min(psg_len, sg->length - offset);
1291                         addr = kmap_atomic(sg_page(sg)) + sg->offset + offset;
1292
1293                         if (read)
1294                                 memcpy(paddr + copied, addr, len);
1295                         else
1296                                 memcpy(addr, paddr + copied, len);
1297
1298                         left -= len;
1299                         offset += len;
1300                         copied += len;
1301                         psg_len -= len;
1302
1303                         if (offset >= sg->length) {
1304                                 sg = sg_next(sg);
1305                                 offset = 0;
1306                         }
1307                         kunmap_atomic(addr);
1308                 }
1309                 kunmap_atomic(paddr);
1310         }
1311 }
1312
1313 sense_reason_t
1314 sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1315                      unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1316 {
1317         struct se_device *dev = cmd->se_dev;
1318         struct se_dif_v1_tuple *sdt;
1319         struct scatterlist *dsg, *psg = cmd->t_prot_sg;
1320         sector_t sector = start;
1321         void *daddr, *paddr;
1322         int i, j, offset = 0;
1323         sense_reason_t rc;
1324
1325         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1326                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1327                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1328
1329                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1330
1331                         if (offset >= psg->length) {
1332                                 kunmap_atomic(paddr);
1333                                 psg = sg_next(psg);
1334                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1335                                 offset = 0;
1336                         }
1337
1338                         sdt = paddr + offset;
1339
1340                         pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x"
1341                                  " app_tag: 0x%04x ref_tag: %u\n",
1342                                  (unsigned long long)sector, sdt->guard_tag,
1343                                  sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1344
1345                         rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
1346                                                ei_lba);
1347                         if (rc) {
1348                                 kunmap_atomic(paddr);
1349                                 kunmap_atomic(daddr);
1350                                 cmd->bad_sector = sector;
1351                                 return rc;
1352                         }
1353
1354                         sector++;
1355                         ei_lba++;
1356                         offset += sizeof(struct se_dif_v1_tuple);
1357                 }
1358
1359                 kunmap_atomic(paddr);
1360                 kunmap_atomic(daddr);
1361         }
1362         if (!sg)
1363                 return 0;
1364
1365         sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off);
1366
1367         return 0;
1368 }
1369 EXPORT_SYMBOL(sbc_dif_verify_write);
1370
1371 static sense_reason_t
1372 __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1373                       unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1374 {
1375         struct se_device *dev = cmd->se_dev;
1376         struct se_dif_v1_tuple *sdt;
1377         struct scatterlist *dsg, *psg = sg;
1378         sector_t sector = start;
1379         void *daddr, *paddr;
1380         int i, j, offset = sg_off;
1381         sense_reason_t rc;
1382
1383         for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) {
1384                 daddr = kmap_atomic(sg_page(dsg)) + dsg->offset;
1385                 paddr = kmap_atomic(sg_page(psg)) + sg->offset;
1386
1387                 for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) {
1388
1389                         if (offset >= psg->length) {
1390                                 kunmap_atomic(paddr);
1391                                 psg = sg_next(psg);
1392                                 paddr = kmap_atomic(sg_page(psg)) + psg->offset;
1393                                 offset = 0;
1394                         }
1395
1396                         sdt = paddr + offset;
1397
1398                         pr_debug("DIF READ sector: %llu guard_tag: 0x%04x"
1399                                  " app_tag: 0x%04x ref_tag: %u\n",
1400                                  (unsigned long long)sector, sdt->guard_tag,
1401                                  sdt->app_tag, be32_to_cpu(sdt->ref_tag));
1402
1403                         if (sdt->app_tag == cpu_to_be16(0xffff)) {
1404                                 sector++;
1405                                 offset += sizeof(struct se_dif_v1_tuple);
1406                                 continue;
1407                         }
1408
1409                         rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector,
1410                                                ei_lba);
1411                         if (rc) {
1412                                 kunmap_atomic(paddr);
1413                                 kunmap_atomic(daddr);
1414                                 cmd->bad_sector = sector;
1415                                 return rc;
1416                         }
1417
1418                         sector++;
1419                         ei_lba++;
1420                         offset += sizeof(struct se_dif_v1_tuple);
1421                 }
1422
1423                 kunmap_atomic(paddr);
1424                 kunmap_atomic(daddr);
1425         }
1426
1427         return 0;
1428 }
1429
1430 sense_reason_t
1431 sbc_dif_read_strip(struct se_cmd *cmd)
1432 {
1433         struct se_device *dev = cmd->se_dev;
1434         u32 sectors = cmd->prot_length / dev->prot_length;
1435
1436         return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0,
1437                                      cmd->t_prot_sg, 0);
1438 }
1439
1440 sense_reason_t
1441 sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors,
1442                     unsigned int ei_lba, struct scatterlist *sg, int sg_off)
1443 {
1444         sense_reason_t rc;
1445
1446         rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off);
1447         if (rc)
1448                 return rc;
1449
1450         sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off);
1451         return 0;
1452 }
1453 EXPORT_SYMBOL(sbc_dif_verify_read);