1d6e0175cSChristoph Hellwig /* 2d6e0175cSChristoph Hellwig * SCSI Block Commands (SBC) parsing and emulation. 3d6e0175cSChristoph Hellwig * 44c76251eSNicholas Bellinger * (c) Copyright 2002-2013 Datera, Inc. 5d6e0175cSChristoph Hellwig * 6d6e0175cSChristoph Hellwig * Nicholas A. Bellinger <nab@kernel.org> 7d6e0175cSChristoph Hellwig * 8d6e0175cSChristoph Hellwig * This program is free software; you can redistribute it and/or modify 9d6e0175cSChristoph Hellwig * it under the terms of the GNU General Public License as published by 10d6e0175cSChristoph Hellwig * the Free Software Foundation; either version 2 of the License, or 11d6e0175cSChristoph Hellwig * (at your option) any later version. 12d6e0175cSChristoph Hellwig * 13d6e0175cSChristoph Hellwig * This program is distributed in the hope that it will be useful, 14d6e0175cSChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 15d6e0175cSChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16d6e0175cSChristoph Hellwig * GNU General Public License for more details. 17d6e0175cSChristoph Hellwig * 18d6e0175cSChristoph Hellwig * You should have received a copy of the GNU General Public License 19d6e0175cSChristoph Hellwig * along with this program; if not, write to the Free Software 20d6e0175cSChristoph Hellwig * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21d6e0175cSChristoph Hellwig */ 22d6e0175cSChristoph Hellwig 23d6e0175cSChristoph Hellwig #include <linux/kernel.h> 24d6e0175cSChristoph Hellwig #include <linux/module.h> 25d6e0175cSChristoph Hellwig #include <linux/ratelimit.h> 2641861fa8SNicholas Bellinger #include <linux/crc-t10dif.h> 27d6e0175cSChristoph Hellwig #include <asm/unaligned.h> 28d6e0175cSChristoph Hellwig #include <scsi/scsi.h> 2968ff9b9bSNicholas Bellinger #include <scsi/scsi_tcq.h> 30d6e0175cSChristoph Hellwig 31d6e0175cSChristoph Hellwig #include <target/target_core_base.h> 32d6e0175cSChristoph Hellwig #include <target/target_core_backend.h> 33d6e0175cSChristoph Hellwig #include <target/target_core_fabric.h> 34d6e0175cSChristoph Hellwig 35d6e0175cSChristoph Hellwig #include "target_core_internal.h" 36d6e0175cSChristoph Hellwig #include "target_core_ua.h" 37c66094bfSHannes Reinecke #include "target_core_alua.h" 38d6e0175cSChristoph Hellwig 39de103c93SChristoph Hellwig static sense_reason_t 40de103c93SChristoph Hellwig sbc_emulate_readcapacity(struct se_cmd *cmd) 411fd032eeSChristoph Hellwig { 421fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 438dc8632aSRoland Dreier unsigned char *cdb = cmd->t_task_cdb; 441fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 45a50da144SPaolo Bonzini unsigned char *rbuf; 46a50da144SPaolo Bonzini unsigned char buf[8]; 471fd032eeSChristoph Hellwig u32 blocks; 481fd032eeSChristoph Hellwig 498dc8632aSRoland Dreier /* 508dc8632aSRoland Dreier * SBC-2 says: 518dc8632aSRoland Dreier * If the PMI bit is set to zero and the LOGICAL BLOCK 528dc8632aSRoland Dreier * ADDRESS field is not set to zero, the device server shall 538dc8632aSRoland Dreier * terminate the command with CHECK CONDITION status with 548dc8632aSRoland Dreier * the sense key set to ILLEGAL REQUEST and the additional 558dc8632aSRoland Dreier * sense code set to INVALID FIELD IN CDB. 568dc8632aSRoland Dreier * 578dc8632aSRoland Dreier * In SBC-3, these fields are obsolete, but some SCSI 588dc8632aSRoland Dreier * compliance tests actually check this, so we might as well 598dc8632aSRoland Dreier * follow SBC-2. 608dc8632aSRoland Dreier */ 618dc8632aSRoland Dreier if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 628dc8632aSRoland Dreier return TCM_INVALID_CDB_FIELD; 638dc8632aSRoland Dreier 641fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 651fd032eeSChristoph Hellwig blocks = 0xffffffff; 661fd032eeSChristoph Hellwig else 671fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 681fd032eeSChristoph Hellwig 691fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 701fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 711fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 721fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 730fd97ccfSChristoph Hellwig buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 740fd97ccfSChristoph Hellwig buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 750fd97ccfSChristoph Hellwig buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 760fd97ccfSChristoph Hellwig buf[7] = dev->dev_attrib.block_size & 0xff; 771fd032eeSChristoph Hellwig 78a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 798b4b0dcbSNicholas Bellinger if (rbuf) { 80a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 811fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 828b4b0dcbSNicholas Bellinger } 831fd032eeSChristoph Hellwig 842426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 8); 851fd032eeSChristoph Hellwig return 0; 861fd032eeSChristoph Hellwig } 871fd032eeSChristoph Hellwig 88de103c93SChristoph Hellwig static sense_reason_t 89de103c93SChristoph Hellwig sbc_emulate_readcapacity_16(struct se_cmd *cmd) 901fd032eeSChristoph Hellwig { 911fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 922d335983SNicholas Bellinger struct se_session *sess = cmd->se_sess; 93a50da144SPaolo Bonzini unsigned char *rbuf; 94a50da144SPaolo Bonzini unsigned char buf[32]; 951fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 961fd032eeSChristoph Hellwig 97a50da144SPaolo Bonzini memset(buf, 0, sizeof(buf)); 981fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 991fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 1001fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 1011fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 1021fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 1031fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 1041fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 1051fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 1060fd97ccfSChristoph Hellwig buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 1070fd97ccfSChristoph Hellwig buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 1080fd97ccfSChristoph Hellwig buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 1090fd97ccfSChristoph Hellwig buf[11] = dev->dev_attrib.block_size & 0xff; 11056dac14cSNicholas Bellinger /* 11156dac14cSNicholas Bellinger * Set P_TYPE and PROT_EN bits for DIF support 11256dac14cSNicholas Bellinger */ 1132d335983SNicholas Bellinger if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 11456dac14cSNicholas Bellinger if (dev->dev_attrib.pi_prot_type) 11556dac14cSNicholas Bellinger buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; 1162d335983SNicholas Bellinger } 1177f7caf6aSAndy Grover 1187f7caf6aSAndy Grover if (dev->transport->get_lbppbe) 1197f7caf6aSAndy Grover buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 1207f7caf6aSAndy Grover 1217f7caf6aSAndy Grover if (dev->transport->get_alignment_offset_lbas) { 1227f7caf6aSAndy Grover u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 1237f7caf6aSAndy Grover buf[14] = (lalba >> 8) & 0x3f; 1247f7caf6aSAndy Grover buf[15] = lalba & 0xff; 1257f7caf6aSAndy Grover } 1267f7caf6aSAndy Grover 1271fd032eeSChristoph Hellwig /* 1281fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 1291fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 1301fd032eeSChristoph Hellwig */ 1310fd97ccfSChristoph Hellwig if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 1327f7caf6aSAndy Grover buf[14] |= 0x80; 1331fd032eeSChristoph Hellwig 134a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 1358b4b0dcbSNicholas Bellinger if (rbuf) { 136a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1371fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1388b4b0dcbSNicholas Bellinger } 1391fd032eeSChristoph Hellwig 1402426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 32); 1411fd032eeSChristoph Hellwig return 0; 1421fd032eeSChristoph Hellwig } 1431fd032eeSChristoph Hellwig 144972b29c8SRoland Dreier sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 1451fd032eeSChristoph Hellwig { 1461fd032eeSChristoph Hellwig u32 num_blocks; 1471fd032eeSChristoph Hellwig 1481fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1491fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1501fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1511fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1521fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1531fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1541fd032eeSChristoph Hellwig 1551fd032eeSChristoph Hellwig /* 1561fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 1571fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 1581fd032eeSChristoph Hellwig */ 1596f974e8cSChristoph Hellwig if (num_blocks) 1606f974e8cSChristoph Hellwig return num_blocks; 1611fd032eeSChristoph Hellwig 1626f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 1636f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 1641fd032eeSChristoph Hellwig } 165972b29c8SRoland Dreier EXPORT_SYMBOL(sbc_get_write_same_sectors); 1661fd032eeSChristoph Hellwig 167de103c93SChristoph Hellwig static sense_reason_t 1681920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 1691a1ff38cSBernhard Kohl { 1701a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 1711a1ff38cSBernhard Kohl return 0; 1721a1ff38cSBernhard Kohl } 1731a1ff38cSBernhard Kohl 174d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 175d6e0175cSChristoph Hellwig { 1760fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 177d6e0175cSChristoph Hellwig } 178d6e0175cSChristoph Hellwig 179d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 180d6e0175cSChristoph Hellwig { 181d6e0175cSChristoph Hellwig /* 182d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 183d6e0175cSChristoph Hellwig * 184d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 185d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 186d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 187d6e0175cSChristoph Hellwig * written. 188d6e0175cSChristoph Hellwig */ 189d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 190d6e0175cSChristoph Hellwig } 191d6e0175cSChristoph Hellwig 192d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 193d6e0175cSChristoph Hellwig { 194d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 195d6e0175cSChristoph Hellwig } 196d6e0175cSChristoph Hellwig 197d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 198d6e0175cSChristoph Hellwig { 199d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 200d6e0175cSChristoph Hellwig } 201d6e0175cSChristoph Hellwig 202d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 203d6e0175cSChristoph Hellwig { 204d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 205d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 206d6e0175cSChristoph Hellwig } 207d6e0175cSChristoph Hellwig 208d6e0175cSChristoph Hellwig /* 209d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 210d6e0175cSChristoph Hellwig */ 211d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 212d6e0175cSChristoph Hellwig { 213d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 214d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 215d6e0175cSChristoph Hellwig 216d6e0175cSChristoph Hellwig } 217d6e0175cSChristoph Hellwig 218d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 219d6e0175cSChristoph Hellwig { 220d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 221d6e0175cSChristoph Hellwig } 222d6e0175cSChristoph Hellwig 223d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 224d6e0175cSChristoph Hellwig { 225d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 226d6e0175cSChristoph Hellwig } 227d6e0175cSChristoph Hellwig 228d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 229d6e0175cSChristoph Hellwig { 230d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 231d6e0175cSChristoph Hellwig 232d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 233d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 234d6e0175cSChristoph Hellwig 235d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 236d6e0175cSChristoph Hellwig } 237d6e0175cSChristoph Hellwig 238d6e0175cSChristoph Hellwig /* 239d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 240d6e0175cSChristoph Hellwig */ 241d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 242d6e0175cSChristoph Hellwig { 243d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 244d6e0175cSChristoph Hellwig 245d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 246d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 247d6e0175cSChristoph Hellwig 248d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 249d6e0175cSChristoph Hellwig } 250d6e0175cSChristoph Hellwig 251cd063befSNicholas Bellinger static sense_reason_t 252cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 253d6e0175cSChristoph Hellwig { 2548e575c50SNicholas Bellinger struct se_device *dev = cmd->se_dev; 2558e575c50SNicholas Bellinger sector_t end_lba = dev->transport->get_blocks(dev) + 1; 256972b29c8SRoland Dreier unsigned int sectors = sbc_get_write_same_sectors(cmd); 257773cbaf7SNicholas Bellinger 258d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 259d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 260d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 261d6e0175cSChristoph Hellwig " Emulation\n"); 262cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 263d6e0175cSChristoph Hellwig } 264773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 265773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 266773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 267773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 268773cbaf7SNicholas Bellinger } 2698e575c50SNicholas Bellinger /* 2708e575c50SNicholas Bellinger * Sanity check for LBA wrap and request past end of device. 2718e575c50SNicholas Bellinger */ 2728e575c50SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 2738e575c50SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 2748e575c50SNicholas Bellinger pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 2758e575c50SNicholas Bellinger (unsigned long long)end_lba, cmd->t_task_lba, sectors); 2768e575c50SNicholas Bellinger return TCM_ADDRESS_OUT_OF_RANGE; 2778e575c50SNicholas Bellinger } 2788e575c50SNicholas Bellinger 2795cb770bfSRoland Dreier /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 2805cb770bfSRoland Dreier if (flags[0] & 0x10) { 2815cb770bfSRoland Dreier pr_warn("WRITE SAME with ANCHOR not supported\n"); 2825cb770bfSRoland Dreier return TCM_INVALID_CDB_FIELD; 2835cb770bfSRoland Dreier } 284d6e0175cSChristoph Hellwig /* 285cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 286cd063befSNicholas Bellinger * translated into block discard requests within backend code. 287d6e0175cSChristoph Hellwig */ 288cd063befSNicholas Bellinger if (flags[0] & 0x08) { 289cd063befSNicholas Bellinger if (!ops->execute_write_same_unmap) 290cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 291d6e0175cSChristoph Hellwig 292cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same_unmap; 293cd063befSNicholas Bellinger return 0; 294cd063befSNicholas Bellinger } 295cd063befSNicholas Bellinger if (!ops->execute_write_same) 296cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 297cd063befSNicholas Bellinger 298cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 299d6e0175cSChristoph Hellwig return 0; 300d6e0175cSChristoph Hellwig } 301d6e0175cSChristoph Hellwig 302a6b0133cSNicholas Bellinger static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) 303d6e0175cSChristoph Hellwig { 304d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 305d6e0175cSChristoph Hellwig struct scatterlist *sg; 306d6e0175cSChristoph Hellwig unsigned int offset; 307a6b0133cSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 308a6b0133cSNicholas Bellinger int i, count; 309d6e0175cSChristoph Hellwig /* 310d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 311d6e0175cSChristoph Hellwig * 312d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 313d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 314d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 315d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 316d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 317d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 318d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 319d6e0175cSChristoph Hellwig */ 320d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 321d6e0175cSChristoph Hellwig if (!buf) { 322d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 323a6b0133cSNicholas Bellinger return TCM_OUT_OF_RESOURCES; 324d6e0175cSChristoph Hellwig } 325d6e0175cSChristoph Hellwig /* 326d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 327d6e0175cSChristoph Hellwig * into the locally allocated *buf 328d6e0175cSChristoph Hellwig */ 329d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 330d6e0175cSChristoph Hellwig cmd->t_data_nents, 331d6e0175cSChristoph Hellwig buf, 332d6e0175cSChristoph Hellwig cmd->data_length); 333d6e0175cSChristoph Hellwig 334d6e0175cSChristoph Hellwig /* 335d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 336d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 337d6e0175cSChristoph Hellwig */ 338d6e0175cSChristoph Hellwig 339d6e0175cSChristoph Hellwig offset = 0; 340d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 341d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 342a6b0133cSNicholas Bellinger if (!addr) { 343a6b0133cSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 344d6e0175cSChristoph Hellwig goto out; 345a6b0133cSNicholas Bellinger } 346d6e0175cSChristoph Hellwig 347d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 348d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 349d6e0175cSChristoph Hellwig 350d6e0175cSChristoph Hellwig offset += sg->length; 351d6e0175cSChristoph Hellwig kunmap_atomic(addr); 352d6e0175cSChristoph Hellwig } 353d6e0175cSChristoph Hellwig 354d6e0175cSChristoph Hellwig out: 355d6e0175cSChristoph Hellwig kfree(buf); 356a6b0133cSNicholas Bellinger return ret; 357d6e0175cSChristoph Hellwig } 358d6e0175cSChristoph Hellwig 359a82a9538SNicholas Bellinger static sense_reason_t 360a82a9538SNicholas Bellinger sbc_execute_rw(struct se_cmd *cmd) 361a82a9538SNicholas Bellinger { 362a82a9538SNicholas Bellinger return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 363a82a9538SNicholas Bellinger cmd->data_direction); 364a82a9538SNicholas Bellinger } 365a82a9538SNicholas Bellinger 36668ff9b9bSNicholas Bellinger static sense_reason_t compare_and_write_post(struct se_cmd *cmd) 36768ff9b9bSNicholas Bellinger { 36868ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 36968ff9b9bSNicholas Bellinger 370d8855c15SNicholas Bellinger /* 371d8855c15SNicholas Bellinger * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 372d8855c15SNicholas Bellinger * within target_complete_ok_work() if the command was successfully 373d8855c15SNicholas Bellinger * sent to the backend driver. 374d8855c15SNicholas Bellinger */ 375d8855c15SNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 376d8855c15SNicholas Bellinger if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 37768ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 378d8855c15SNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 379d8855c15SNicholas Bellinger 38068ff9b9bSNicholas Bellinger /* 38168ff9b9bSNicholas Bellinger * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 38268ff9b9bSNicholas Bellinger * before the original READ I/O submission. 38368ff9b9bSNicholas Bellinger */ 38468ff9b9bSNicholas Bellinger up(&dev->caw_sem); 38568ff9b9bSNicholas Bellinger 38668ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 38768ff9b9bSNicholas Bellinger } 38868ff9b9bSNicholas Bellinger 38968ff9b9bSNicholas Bellinger static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) 39068ff9b9bSNicholas Bellinger { 39168ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 39268ff9b9bSNicholas Bellinger struct scatterlist *write_sg = NULL, *sg; 393db60df88SNicholas Bellinger unsigned char *buf = NULL, *addr; 39468ff9b9bSNicholas Bellinger struct sg_mapping_iter m; 39568ff9b9bSNicholas Bellinger unsigned int offset = 0, len; 39668ff9b9bSNicholas Bellinger unsigned int nlbas = cmd->t_task_nolb; 39768ff9b9bSNicholas Bellinger unsigned int block_size = dev->dev_attrib.block_size; 39868ff9b9bSNicholas Bellinger unsigned int compare_len = (nlbas * block_size); 39968ff9b9bSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 40068ff9b9bSNicholas Bellinger int rc, i; 40168ff9b9bSNicholas Bellinger 402cf6d1f09SNicholas Bellinger /* 403cf6d1f09SNicholas Bellinger * Handle early failure in transport_generic_request_failure(), 404cf6d1f09SNicholas Bellinger * which will not have taken ->caw_mutex yet.. 405cf6d1f09SNicholas Bellinger */ 406cf6d1f09SNicholas Bellinger if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) 407cf6d1f09SNicholas Bellinger return TCM_NO_SENSE; 408db60df88SNicholas Bellinger /* 409db60df88SNicholas Bellinger * Immediately exit + release dev->caw_sem if command has already 410db60df88SNicholas Bellinger * been failed with a non-zero SCSI status. 411db60df88SNicholas Bellinger */ 412db60df88SNicholas Bellinger if (cmd->scsi_status) { 413db60df88SNicholas Bellinger pr_err("compare_and_write_callback: non zero scsi_status:" 414db60df88SNicholas Bellinger " 0x%02x\n", cmd->scsi_status); 415db60df88SNicholas Bellinger goto out; 416db60df88SNicholas Bellinger } 417cf6d1f09SNicholas Bellinger 41868ff9b9bSNicholas Bellinger buf = kzalloc(cmd->data_length, GFP_KERNEL); 41968ff9b9bSNicholas Bellinger if (!buf) { 42068ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write buf\n"); 421a2890087SNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 422a2890087SNicholas Bellinger goto out; 42368ff9b9bSNicholas Bellinger } 42468ff9b9bSNicholas Bellinger 425a1e1774cSMartin Svec write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 42668ff9b9bSNicholas Bellinger GFP_KERNEL); 42768ff9b9bSNicholas Bellinger if (!write_sg) { 42868ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write sg\n"); 42968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 43068ff9b9bSNicholas Bellinger goto out; 43168ff9b9bSNicholas Bellinger } 432a1e1774cSMartin Svec sg_init_table(write_sg, cmd->t_data_nents); 43368ff9b9bSNicholas Bellinger /* 43468ff9b9bSNicholas Bellinger * Setup verify and write data payloads from total NumberLBAs. 43568ff9b9bSNicholas Bellinger */ 43668ff9b9bSNicholas Bellinger rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 43768ff9b9bSNicholas Bellinger cmd->data_length); 43868ff9b9bSNicholas Bellinger if (!rc) { 43968ff9b9bSNicholas Bellinger pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 44068ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 44168ff9b9bSNicholas Bellinger goto out; 44268ff9b9bSNicholas Bellinger } 44368ff9b9bSNicholas Bellinger /* 44468ff9b9bSNicholas Bellinger * Compare against SCSI READ payload against verify payload 44568ff9b9bSNicholas Bellinger */ 44668ff9b9bSNicholas Bellinger for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 44768ff9b9bSNicholas Bellinger addr = (unsigned char *)kmap_atomic(sg_page(sg)); 44868ff9b9bSNicholas Bellinger if (!addr) { 44968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 45068ff9b9bSNicholas Bellinger goto out; 45168ff9b9bSNicholas Bellinger } 45268ff9b9bSNicholas Bellinger 45368ff9b9bSNicholas Bellinger len = min(sg->length, compare_len); 45468ff9b9bSNicholas Bellinger 45568ff9b9bSNicholas Bellinger if (memcmp(addr, buf + offset, len)) { 45668ff9b9bSNicholas Bellinger pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 45768ff9b9bSNicholas Bellinger addr, buf + offset); 45868ff9b9bSNicholas Bellinger kunmap_atomic(addr); 45968ff9b9bSNicholas Bellinger goto miscompare; 46068ff9b9bSNicholas Bellinger } 46168ff9b9bSNicholas Bellinger kunmap_atomic(addr); 46268ff9b9bSNicholas Bellinger 46368ff9b9bSNicholas Bellinger offset += len; 46468ff9b9bSNicholas Bellinger compare_len -= len; 46568ff9b9bSNicholas Bellinger if (!compare_len) 46668ff9b9bSNicholas Bellinger break; 46768ff9b9bSNicholas Bellinger } 46868ff9b9bSNicholas Bellinger 46968ff9b9bSNicholas Bellinger i = 0; 47068ff9b9bSNicholas Bellinger len = cmd->t_task_nolb * block_size; 47168ff9b9bSNicholas Bellinger sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 47268ff9b9bSNicholas Bellinger /* 47368ff9b9bSNicholas Bellinger * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 47468ff9b9bSNicholas Bellinger */ 47568ff9b9bSNicholas Bellinger while (len) { 47668ff9b9bSNicholas Bellinger sg_miter_next(&m); 47768ff9b9bSNicholas Bellinger 47868ff9b9bSNicholas Bellinger if (block_size < PAGE_SIZE) { 47968ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 48068ff9b9bSNicholas Bellinger block_size); 48168ff9b9bSNicholas Bellinger } else { 48268ff9b9bSNicholas Bellinger sg_miter_next(&m); 48368ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 48468ff9b9bSNicholas Bellinger 0); 48568ff9b9bSNicholas Bellinger } 48668ff9b9bSNicholas Bellinger len -= block_size; 48768ff9b9bSNicholas Bellinger i++; 48868ff9b9bSNicholas Bellinger } 48968ff9b9bSNicholas Bellinger sg_miter_stop(&m); 49068ff9b9bSNicholas Bellinger /* 49168ff9b9bSNicholas Bellinger * Save the original SGL + nents values before updating to new 49268ff9b9bSNicholas Bellinger * assignments, to be released in transport_free_pages() -> 49368ff9b9bSNicholas Bellinger * transport_reset_sgl_orig() 49468ff9b9bSNicholas Bellinger */ 49568ff9b9bSNicholas Bellinger cmd->t_data_sg_orig = cmd->t_data_sg; 49668ff9b9bSNicholas Bellinger cmd->t_data_sg = write_sg; 49768ff9b9bSNicholas Bellinger cmd->t_data_nents_orig = cmd->t_data_nents; 49868ff9b9bSNicholas Bellinger cmd->t_data_nents = 1; 49968ff9b9bSNicholas Bellinger 50068d81f40SChristoph Hellwig cmd->sam_task_attr = TCM_HEAD_TAG; 50168ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_post; 50268ff9b9bSNicholas Bellinger /* 50368ff9b9bSNicholas Bellinger * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 50468ff9b9bSNicholas Bellinger * for submitting the adjusted SGL to write instance user-data. 50568ff9b9bSNicholas Bellinger */ 50668ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 50768ff9b9bSNicholas Bellinger 50868ff9b9bSNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 50968ff9b9bSNicholas Bellinger cmd->t_state = TRANSPORT_PROCESSING; 51068ff9b9bSNicholas Bellinger cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 51168ff9b9bSNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 51268ff9b9bSNicholas Bellinger 51368ff9b9bSNicholas Bellinger __target_execute_cmd(cmd); 51468ff9b9bSNicholas Bellinger 51568ff9b9bSNicholas Bellinger kfree(buf); 51668ff9b9bSNicholas Bellinger return ret; 51768ff9b9bSNicholas Bellinger 51868ff9b9bSNicholas Bellinger miscompare: 51968ff9b9bSNicholas Bellinger pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 52068ff9b9bSNicholas Bellinger dev->transport->name); 52168ff9b9bSNicholas Bellinger ret = TCM_MISCOMPARE_VERIFY; 52268ff9b9bSNicholas Bellinger out: 52368ff9b9bSNicholas Bellinger /* 52468ff9b9bSNicholas Bellinger * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 52568ff9b9bSNicholas Bellinger * sbc_compare_and_write() before the original READ I/O submission. 52668ff9b9bSNicholas Bellinger */ 52768ff9b9bSNicholas Bellinger up(&dev->caw_sem); 52868ff9b9bSNicholas Bellinger kfree(write_sg); 52968ff9b9bSNicholas Bellinger kfree(buf); 53068ff9b9bSNicholas Bellinger return ret; 53168ff9b9bSNicholas Bellinger } 53268ff9b9bSNicholas Bellinger 53368ff9b9bSNicholas Bellinger static sense_reason_t 53468ff9b9bSNicholas Bellinger sbc_compare_and_write(struct se_cmd *cmd) 53568ff9b9bSNicholas Bellinger { 53668ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 53768ff9b9bSNicholas Bellinger sense_reason_t ret; 53868ff9b9bSNicholas Bellinger int rc; 53968ff9b9bSNicholas Bellinger /* 54068ff9b9bSNicholas Bellinger * Submit the READ first for COMPARE_AND_WRITE to perform the 54168ff9b9bSNicholas Bellinger * comparision using SGLs at cmd->t_bidi_data_sg.. 54268ff9b9bSNicholas Bellinger */ 54368ff9b9bSNicholas Bellinger rc = down_interruptible(&dev->caw_sem); 54468ff9b9bSNicholas Bellinger if ((rc != 0) || signal_pending(current)) { 54568ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 54668ff9b9bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 54768ff9b9bSNicholas Bellinger } 548b7191253SNicholas Bellinger /* 549b7191253SNicholas Bellinger * Reset cmd->data_length to individual block_size in order to not 550b7191253SNicholas Bellinger * confuse backend drivers that depend on this value matching the 551b7191253SNicholas Bellinger * size of the I/O being submitted. 552b7191253SNicholas Bellinger */ 553b7191253SNicholas Bellinger cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 55468ff9b9bSNicholas Bellinger 55568ff9b9bSNicholas Bellinger ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 55668ff9b9bSNicholas Bellinger DMA_FROM_DEVICE); 55768ff9b9bSNicholas Bellinger if (ret) { 55868ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 55968ff9b9bSNicholas Bellinger up(&dev->caw_sem); 56068ff9b9bSNicholas Bellinger return ret; 56168ff9b9bSNicholas Bellinger } 56268ff9b9bSNicholas Bellinger /* 56368ff9b9bSNicholas Bellinger * Unlock of dev->caw_sem to occur in compare_and_write_callback() 56468ff9b9bSNicholas Bellinger * upon MISCOMPARE, or in compare_and_write_done() upon completion 56568ff9b9bSNicholas Bellinger * of WRITE instance user-data. 56668ff9b9bSNicholas Bellinger */ 56768ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 56868ff9b9bSNicholas Bellinger } 56968ff9b9bSNicholas Bellinger 57019f9361aSSagi Grimberg static int 57119f9361aSSagi Grimberg sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, 57219f9361aSSagi Grimberg bool is_write, struct se_cmd *cmd) 57319f9361aSSagi Grimberg { 57419f9361aSSagi Grimberg if (is_write) { 57519f9361aSSagi Grimberg cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : 57619f9361aSSagi Grimberg TARGET_PROT_DOUT_INSERT; 57719f9361aSSagi Grimberg switch (protect) { 57819f9361aSSagi Grimberg case 0x0: 57919f9361aSSagi Grimberg case 0x3: 58019f9361aSSagi Grimberg cmd->prot_checks = 0; 58119f9361aSSagi Grimberg break; 58219f9361aSSagi Grimberg case 0x1: 58319f9361aSSagi Grimberg case 0x5: 58419f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 58519f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 58619f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 58719f9361aSSagi Grimberg break; 58819f9361aSSagi Grimberg case 0x2: 58919f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 59019f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 59119f9361aSSagi Grimberg break; 59219f9361aSSagi Grimberg case 0x4: 59319f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 59419f9361aSSagi Grimberg break; 59519f9361aSSagi Grimberg default: 59619f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 59719f9361aSSagi Grimberg return -EINVAL; 59819f9361aSSagi Grimberg } 59919f9361aSSagi Grimberg } else { 60019f9361aSSagi Grimberg cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : 60119f9361aSSagi Grimberg TARGET_PROT_DIN_STRIP; 60219f9361aSSagi Grimberg switch (protect) { 60319f9361aSSagi Grimberg case 0x0: 60419f9361aSSagi Grimberg case 0x1: 60519f9361aSSagi Grimberg case 0x5: 60619f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 60719f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 60819f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 60919f9361aSSagi Grimberg break; 61019f9361aSSagi Grimberg case 0x2: 61119f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 61219f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 61319f9361aSSagi Grimberg break; 61419f9361aSSagi Grimberg case 0x3: 61519f9361aSSagi Grimberg cmd->prot_checks = 0; 61619f9361aSSagi Grimberg break; 61719f9361aSSagi Grimberg case 0x4: 61819f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 61919f9361aSSagi Grimberg break; 62019f9361aSSagi Grimberg default: 62119f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 62219f9361aSSagi Grimberg return -EINVAL; 62319f9361aSSagi Grimberg } 62419f9361aSSagi Grimberg } 62519f9361aSSagi Grimberg 62619f9361aSSagi Grimberg return 0; 62719f9361aSSagi Grimberg } 62819f9361aSSagi Grimberg 629499bf77bSNicholas Bellinger static bool 630499bf77bSNicholas Bellinger sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 63119f9361aSSagi Grimberg u32 sectors, bool is_write) 632499bf77bSNicholas Bellinger { 63319f9361aSSagi Grimberg u8 protect = cdb[1] >> 5; 63419f9361aSSagi Grimberg 635b5b8e298SSagi Grimberg if ((!cmd->t_prot_sg || !cmd->t_prot_nents) && cmd->prot_pto) 636499bf77bSNicholas Bellinger return true; 637499bf77bSNicholas Bellinger 638499bf77bSNicholas Bellinger switch (dev->dev_attrib.pi_prot_type) { 639499bf77bSNicholas Bellinger case TARGET_DIF_TYPE3_PROT: 640499bf77bSNicholas Bellinger cmd->reftag_seed = 0xffffffff; 641499bf77bSNicholas Bellinger break; 642499bf77bSNicholas Bellinger case TARGET_DIF_TYPE2_PROT: 64319f9361aSSagi Grimberg if (protect) 644499bf77bSNicholas Bellinger return false; 645499bf77bSNicholas Bellinger 646499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 647499bf77bSNicholas Bellinger break; 648499bf77bSNicholas Bellinger case TARGET_DIF_TYPE1_PROT: 649499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 650499bf77bSNicholas Bellinger break; 651499bf77bSNicholas Bellinger case TARGET_DIF_TYPE0_PROT: 652499bf77bSNicholas Bellinger default: 653499bf77bSNicholas Bellinger return true; 654499bf77bSNicholas Bellinger } 655499bf77bSNicholas Bellinger 65619f9361aSSagi Grimberg if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, 65719f9361aSSagi Grimberg is_write, cmd)) 65819f9361aSSagi Grimberg return false; 65919f9361aSSagi Grimberg 660499bf77bSNicholas Bellinger cmd->prot_type = dev->dev_attrib.pi_prot_type; 661499bf77bSNicholas Bellinger cmd->prot_length = dev->prot_length * sectors; 662e2a4f55cSSagi Grimberg 663e2a4f55cSSagi Grimberg /** 664e2a4f55cSSagi Grimberg * In case protection information exists over the wire 665e2a4f55cSSagi Grimberg * we modify command data length to describe pure data. 666e2a4f55cSSagi Grimberg * The actual transfer length is data length + protection 667e2a4f55cSSagi Grimberg * length 668e2a4f55cSSagi Grimberg **/ 669e2a4f55cSSagi Grimberg if (protect) 670e2a4f55cSSagi Grimberg cmd->data_length = sectors * dev->dev_attrib.block_size; 671e2a4f55cSSagi Grimberg 672e2a4f55cSSagi Grimberg pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 673e2a4f55cSSagi Grimberg "prot_op=%d prot_checks=%d\n", 674e2a4f55cSSagi Grimberg __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 67503abad9eSSagi Grimberg cmd->prot_op, cmd->prot_checks); 676499bf77bSNicholas Bellinger 677499bf77bSNicholas Bellinger return true; 678499bf77bSNicholas Bellinger } 679499bf77bSNicholas Bellinger 680de103c93SChristoph Hellwig sense_reason_t 681de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 682d6e0175cSChristoph Hellwig { 683d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 684d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 6851fd032eeSChristoph Hellwig unsigned int size; 686d6e0175cSChristoph Hellwig u32 sectors = 0; 687de103c93SChristoph Hellwig sense_reason_t ret; 688d6e0175cSChristoph Hellwig 689d6e0175cSChristoph Hellwig switch (cdb[0]) { 690d6e0175cSChristoph Hellwig case READ_6: 691d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 692d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 693d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 694a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 695a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 696d6e0175cSChristoph Hellwig break; 697d6e0175cSChristoph Hellwig case READ_10: 698d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 699d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 700499bf77bSNicholas Bellinger 70119f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 702499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 703499bf77bSNicholas Bellinger 704d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 705a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 706a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 707d6e0175cSChristoph Hellwig break; 708d6e0175cSChristoph Hellwig case READ_12: 709d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 710d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 711499bf77bSNicholas Bellinger 71219f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 713499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 714499bf77bSNicholas Bellinger 715d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 716a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 717a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 718d6e0175cSChristoph Hellwig break; 719d6e0175cSChristoph Hellwig case READ_16: 720d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 721d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 722499bf77bSNicholas Bellinger 72319f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, false)) 724499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 725499bf77bSNicholas Bellinger 726d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 727a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 728a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 729d6e0175cSChristoph Hellwig break; 730d6e0175cSChristoph Hellwig case WRITE_6: 731d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 732d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 733d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 734a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 735a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 736d6e0175cSChristoph Hellwig break; 737d6e0175cSChristoph Hellwig case WRITE_10: 738d6e0175cSChristoph Hellwig case WRITE_VERIFY: 739d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 740d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 741499bf77bSNicholas Bellinger 74219f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 743499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 744499bf77bSNicholas Bellinger 745d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 746d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 747d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 748a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 749a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 750d6e0175cSChristoph Hellwig break; 751d6e0175cSChristoph Hellwig case WRITE_12: 752d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 753d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 754499bf77bSNicholas Bellinger 75519f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 756499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 757499bf77bSNicholas Bellinger 758d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 759d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 760d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 761a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 762a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 763d6e0175cSChristoph Hellwig break; 764d6e0175cSChristoph Hellwig case WRITE_16: 765d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 766d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 767499bf77bSNicholas Bellinger 76819f9361aSSagi Grimberg if (!sbc_check_prot(dev, cmd, cdb, sectors, true)) 769499bf77bSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 770499bf77bSNicholas Bellinger 771d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 772d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 773d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 774a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 775a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 776d6e0175cSChristoph Hellwig break; 777d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 778de103c93SChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 779d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 780de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 781d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 782d6e0175cSChristoph Hellwig 783d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 784d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 785d6e0175cSChristoph Hellwig 786d6e0175cSChristoph Hellwig /* 787d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 788d6e0175cSChristoph Hellwig */ 789a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 790a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 791d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 792d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 793d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 794d6e0175cSChristoph Hellwig break; 795d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 796d6e0175cSChristoph Hellwig { 797d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 798d6e0175cSChristoph Hellwig switch (service_action) { 799d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 800d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 801d6e0175cSChristoph Hellwig 802d6e0175cSChristoph Hellwig /* 803d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 804d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 805d6e0175cSChristoph Hellwig */ 806d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 807d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 808d6e0175cSChristoph Hellwig 809d6e0175cSChristoph Hellwig /* 810d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 811d6e0175cSChristoph Hellwig * completion. 812d6e0175cSChristoph Hellwig */ 813a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 814a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 815d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 816d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 817d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 818d6e0175cSChristoph Hellwig break; 819d6e0175cSChristoph Hellwig case WRITE_SAME_32: 820d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 821d6e0175cSChristoph Hellwig if (!sectors) { 822d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 823d6e0175cSChristoph Hellwig " supported\n"); 824de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 825d6e0175cSChristoph Hellwig } 826d6e0175cSChristoph Hellwig 8271fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 828d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 829d6e0175cSChristoph Hellwig 830cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[10], ops); 8316b64e1feSDan Carpenter if (ret) 832cd063befSNicholas Bellinger return ret; 833d6e0175cSChristoph Hellwig break; 834d6e0175cSChristoph Hellwig default: 835d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 836d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 837de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 838d6e0175cSChristoph Hellwig } 839d6e0175cSChristoph Hellwig break; 840d6e0175cSChristoph Hellwig } 84168ff9b9bSNicholas Bellinger case COMPARE_AND_WRITE: 84268ff9b9bSNicholas Bellinger sectors = cdb[13]; 84368ff9b9bSNicholas Bellinger /* 84468ff9b9bSNicholas Bellinger * Currently enforce COMPARE_AND_WRITE for a single sector 84568ff9b9bSNicholas Bellinger */ 84668ff9b9bSNicholas Bellinger if (sectors > 1) { 84768ff9b9bSNicholas Bellinger pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 84868ff9b9bSNicholas Bellinger " than 1\n", sectors); 84968ff9b9bSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 85068ff9b9bSNicholas Bellinger } 85168ff9b9bSNicholas Bellinger /* 85268ff9b9bSNicholas Bellinger * Double size because we have two buffers, note that 85368ff9b9bSNicholas Bellinger * zero is not an error.. 85468ff9b9bSNicholas Bellinger */ 85568ff9b9bSNicholas Bellinger size = 2 * sbc_get_size(cmd, sectors); 85668ff9b9bSNicholas Bellinger cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 85768ff9b9bSNicholas Bellinger cmd->t_task_nolb = sectors; 85868ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 85968ff9b9bSNicholas Bellinger cmd->execute_rw = ops->execute_rw; 86068ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_compare_and_write; 86168ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_callback; 86268ff9b9bSNicholas Bellinger break; 863d6e0175cSChristoph Hellwig case READ_CAPACITY: 8641fd032eeSChristoph Hellwig size = READ_CAP_LEN; 8651fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 866d6e0175cSChristoph Hellwig break; 867eb846d9fSHannes Reinecke case SERVICE_ACTION_IN_16: 868d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 869d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 8701fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 871d6e0175cSChristoph Hellwig break; 872c66094bfSHannes Reinecke case SAI_REPORT_REFERRALS: 873c66094bfSHannes Reinecke cmd->execute_cmd = target_emulate_report_referrals; 874c66094bfSHannes Reinecke break; 875d6e0175cSChristoph Hellwig default: 876d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 877d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 878de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 879d6e0175cSChristoph Hellwig } 8801fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 881d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 882d6e0175cSChristoph Hellwig break; 883d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 884d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 885d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 886d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 887d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 888d6e0175cSChristoph Hellwig } else { 889d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 890d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 891d6e0175cSChristoph Hellwig } 8926ef31dc7SChristophe Vu-Brugier if (ops->execute_sync_cache) { 893ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 8946ef31dc7SChristophe Vu-Brugier goto check_lba; 8956ef31dc7SChristophe Vu-Brugier } 8966ef31dc7SChristophe Vu-Brugier size = 0; 8976ef31dc7SChristophe Vu-Brugier cmd->execute_cmd = sbc_emulate_noop; 898d6e0175cSChristoph Hellwig break; 899d6e0175cSChristoph Hellwig case UNMAP: 90014150a6bSChristoph Hellwig if (!ops->execute_unmap) 901de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 90214150a6bSChristoph Hellwig 9031fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 90414150a6bSChristoph Hellwig cmd->execute_cmd = ops->execute_unmap; 905d6e0175cSChristoph Hellwig break; 906d6e0175cSChristoph Hellwig case WRITE_SAME_16: 907d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 908d6e0175cSChristoph Hellwig if (!sectors) { 909d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 910de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 911d6e0175cSChristoph Hellwig } 912d6e0175cSChristoph Hellwig 9131fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 914d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 915d6e0175cSChristoph Hellwig 916cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 9176b64e1feSDan Carpenter if (ret) 918cd063befSNicholas Bellinger return ret; 919d6e0175cSChristoph Hellwig break; 920d6e0175cSChristoph Hellwig case WRITE_SAME: 921d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 922d6e0175cSChristoph Hellwig if (!sectors) { 923d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 924de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 925d6e0175cSChristoph Hellwig } 926d6e0175cSChristoph Hellwig 9271fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 928d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 929d6e0175cSChristoph Hellwig 930d6e0175cSChristoph Hellwig /* 931d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 932d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 933d6e0175cSChristoph Hellwig */ 934cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 9356b64e1feSDan Carpenter if (ret) 936cd063befSNicholas Bellinger return ret; 937d6e0175cSChristoph Hellwig break; 938d6e0175cSChristoph Hellwig case VERIFY: 9391fd032eeSChristoph Hellwig size = 0; 940c52716deSChristophe Vu-Brugier sectors = transport_get_sectors_10(cdb); 941c52716deSChristophe Vu-Brugier cmd->t_task_lba = transport_lba_32(cdb); 9421920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 943c52716deSChristophe Vu-Brugier goto check_lba; 9441a1ff38cSBernhard Kohl case REZERO_UNIT: 9451a1ff38cSBernhard Kohl case SEEK_6: 9461a1ff38cSBernhard Kohl case SEEK_10: 9471a1ff38cSBernhard Kohl /* 9481a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 9491a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 9501a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 9511a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 9521a1ff38cSBernhard Kohl */ 9531a1ff38cSBernhard Kohl size = 0; 9541a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 9551a1ff38cSBernhard Kohl break; 956d6e0175cSChristoph Hellwig default: 9571fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 958d6e0175cSChristoph Hellwig if (ret) 959d6e0175cSChristoph Hellwig return ret; 960d6e0175cSChristoph Hellwig } 961d6e0175cSChristoph Hellwig 962d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 96320959c4bSAndy Grover if (!cmd->execute_cmd) 964de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 965d6e0175cSChristoph Hellwig 966d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 9671fd032eeSChristoph Hellwig unsigned long long end_lba; 9681fd032eeSChristoph Hellwig 9690fd97ccfSChristoph Hellwig if (sectors > dev->dev_attrib.fabric_max_sectors) { 970d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 971d6e0175cSChristoph Hellwig " big sectors %u exceeds fabric_max_sectors:" 972d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 9730fd97ccfSChristoph Hellwig dev->dev_attrib.fabric_max_sectors); 974de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 975d6e0175cSChristoph Hellwig } 9760fd97ccfSChristoph Hellwig if (sectors > dev->dev_attrib.hw_max_sectors) { 977d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 978d6e0175cSChristoph Hellwig " big sectors %u exceeds backend hw_max_sectors:" 979d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 9800fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors); 981de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 982d6e0175cSChristoph Hellwig } 9836ef31dc7SChristophe Vu-Brugier check_lba: 9841fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 985aa179935SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 986aa179935SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 9871fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 9881fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 9891fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 99009ceadc7SRoland Dreier return TCM_ADDRESS_OUT_OF_RANGE; 991d6e0175cSChristoph Hellwig } 992d6e0175cSChristoph Hellwig 99368ff9b9bSNicholas Bellinger if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 9941fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 9951fd032eeSChristoph Hellwig } 9961fd032eeSChristoph Hellwig 997de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 998d6e0175cSChristoph Hellwig } 999d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 10006f23ac8aSChristoph Hellwig 10016f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 10026f23ac8aSChristoph Hellwig { 10036f23ac8aSChristoph Hellwig return TYPE_DISK; 10046f23ac8aSChristoph Hellwig } 10056f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 100686d71829SAsias He 100786d71829SAsias He sense_reason_t 100886d71829SAsias He sbc_execute_unmap(struct se_cmd *cmd, 100986d71829SAsias He sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, 101086d71829SAsias He sector_t, sector_t), 101186d71829SAsias He void *priv) 101286d71829SAsias He { 101386d71829SAsias He struct se_device *dev = cmd->se_dev; 101486d71829SAsias He unsigned char *buf, *ptr = NULL; 101586d71829SAsias He sector_t lba; 101686d71829SAsias He int size; 101786d71829SAsias He u32 range; 101886d71829SAsias He sense_reason_t ret = 0; 101986d71829SAsias He int dl, bd_dl; 102086d71829SAsias He 102186d71829SAsias He /* We never set ANC_SUP */ 102286d71829SAsias He if (cmd->t_task_cdb[1]) 102386d71829SAsias He return TCM_INVALID_CDB_FIELD; 102486d71829SAsias He 102586d71829SAsias He if (cmd->data_length == 0) { 102686d71829SAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 102786d71829SAsias He return 0; 102886d71829SAsias He } 102986d71829SAsias He 103086d71829SAsias He if (cmd->data_length < 8) { 103186d71829SAsias He pr_warn("UNMAP parameter list length %u too small\n", 103286d71829SAsias He cmd->data_length); 103386d71829SAsias He return TCM_PARAMETER_LIST_LENGTH_ERROR; 103486d71829SAsias He } 103586d71829SAsias He 103686d71829SAsias He buf = transport_kmap_data_sg(cmd); 103786d71829SAsias He if (!buf) 103886d71829SAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 103986d71829SAsias He 104086d71829SAsias He dl = get_unaligned_be16(&buf[0]); 104186d71829SAsias He bd_dl = get_unaligned_be16(&buf[2]); 104286d71829SAsias He 104386d71829SAsias He size = cmd->data_length - 8; 104486d71829SAsias He if (bd_dl > size) 104586d71829SAsias He pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 104686d71829SAsias He cmd->data_length, bd_dl); 104786d71829SAsias He else 104886d71829SAsias He size = bd_dl; 104986d71829SAsias He 105086d71829SAsias He if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 105186d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 105286d71829SAsias He goto err; 105386d71829SAsias He } 105486d71829SAsias He 105586d71829SAsias He /* First UNMAP block descriptor starts at 8 byte offset */ 105686d71829SAsias He ptr = &buf[8]; 105786d71829SAsias He pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 105886d71829SAsias He " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 105986d71829SAsias He 106086d71829SAsias He while (size >= 16) { 106186d71829SAsias He lba = get_unaligned_be64(&ptr[0]); 106286d71829SAsias He range = get_unaligned_be32(&ptr[8]); 106386d71829SAsias He pr_debug("UNMAP: Using lba: %llu and range: %u\n", 106486d71829SAsias He (unsigned long long)lba, range); 106586d71829SAsias He 106686d71829SAsias He if (range > dev->dev_attrib.max_unmap_lba_count) { 106786d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 106886d71829SAsias He goto err; 106986d71829SAsias He } 107086d71829SAsias He 107186d71829SAsias He if (lba + range > dev->transport->get_blocks(dev) + 1) { 107286d71829SAsias He ret = TCM_ADDRESS_OUT_OF_RANGE; 107386d71829SAsias He goto err; 107486d71829SAsias He } 107586d71829SAsias He 107686d71829SAsias He ret = do_unmap_fn(cmd, priv, lba, range); 107786d71829SAsias He if (ret) 107886d71829SAsias He goto err; 107986d71829SAsias He 108086d71829SAsias He ptr += 16; 108186d71829SAsias He size -= 16; 108286d71829SAsias He } 108386d71829SAsias He 108486d71829SAsias He err: 108586d71829SAsias He transport_kunmap_data_sg(cmd); 108686d71829SAsias He if (!ret) 108786d71829SAsias He target_complete_cmd(cmd, GOOD); 108886d71829SAsias He return ret; 108986d71829SAsias He } 109086d71829SAsias He EXPORT_SYMBOL(sbc_execute_unmap); 109141861fa8SNicholas Bellinger 109266a3d5bcSNicholas Bellinger void 109366a3d5bcSNicholas Bellinger sbc_dif_generate(struct se_cmd *cmd) 109466a3d5bcSNicholas Bellinger { 109566a3d5bcSNicholas Bellinger struct se_device *dev = cmd->se_dev; 109666a3d5bcSNicholas Bellinger struct se_dif_v1_tuple *sdt; 109766a3d5bcSNicholas Bellinger struct scatterlist *dsg, *psg = cmd->t_prot_sg; 109866a3d5bcSNicholas Bellinger sector_t sector = cmd->t_task_lba; 109966a3d5bcSNicholas Bellinger void *daddr, *paddr; 110066a3d5bcSNicholas Bellinger int i, j, offset = 0; 110166a3d5bcSNicholas Bellinger 110266a3d5bcSNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 110366a3d5bcSNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 110466a3d5bcSNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 110566a3d5bcSNicholas Bellinger 110666a3d5bcSNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 110766a3d5bcSNicholas Bellinger 110866a3d5bcSNicholas Bellinger if (offset >= psg->length) { 110966a3d5bcSNicholas Bellinger kunmap_atomic(paddr); 111066a3d5bcSNicholas Bellinger psg = sg_next(psg); 111166a3d5bcSNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 111266a3d5bcSNicholas Bellinger offset = 0; 111366a3d5bcSNicholas Bellinger } 111466a3d5bcSNicholas Bellinger 111566a3d5bcSNicholas Bellinger sdt = paddr + offset; 111666a3d5bcSNicholas Bellinger sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, 111766a3d5bcSNicholas Bellinger dev->dev_attrib.block_size)); 111866a3d5bcSNicholas Bellinger if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) 111966a3d5bcSNicholas Bellinger sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 112066a3d5bcSNicholas Bellinger sdt->app_tag = 0; 112166a3d5bcSNicholas Bellinger 112266a3d5bcSNicholas Bellinger pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" 112366a3d5bcSNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 112466a3d5bcSNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 112566a3d5bcSNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 112666a3d5bcSNicholas Bellinger 112766a3d5bcSNicholas Bellinger sector++; 112866a3d5bcSNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 112966a3d5bcSNicholas Bellinger } 113066a3d5bcSNicholas Bellinger 113166a3d5bcSNicholas Bellinger kunmap_atomic(paddr); 113266a3d5bcSNicholas Bellinger kunmap_atomic(daddr); 113366a3d5bcSNicholas Bellinger } 113466a3d5bcSNicholas Bellinger } 113566a3d5bcSNicholas Bellinger 113641861fa8SNicholas Bellinger static sense_reason_t 113741861fa8SNicholas Bellinger sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, 113841861fa8SNicholas Bellinger const void *p, sector_t sector, unsigned int ei_lba) 113941861fa8SNicholas Bellinger { 114041861fa8SNicholas Bellinger int block_size = dev->dev_attrib.block_size; 114141861fa8SNicholas Bellinger __be16 csum; 114241861fa8SNicholas Bellinger 114341861fa8SNicholas Bellinger csum = cpu_to_be16(crc_t10dif(p, block_size)); 114441861fa8SNicholas Bellinger 114541861fa8SNicholas Bellinger if (sdt->guard_tag != csum) { 114641861fa8SNicholas Bellinger pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 114741861fa8SNicholas Bellinger " csum 0x%04x\n", (unsigned long long)sector, 114841861fa8SNicholas Bellinger be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 114941861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 115041861fa8SNicholas Bellinger } 115141861fa8SNicholas Bellinger 115241861fa8SNicholas Bellinger if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && 115341861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 115441861fa8SNicholas Bellinger pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 115541861fa8SNicholas Bellinger " sector MSB: 0x%08x\n", (unsigned long long)sector, 115641861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 115741861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 115841861fa8SNicholas Bellinger } 115941861fa8SNicholas Bellinger 116041861fa8SNicholas Bellinger if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && 116141861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != ei_lba) { 116241861fa8SNicholas Bellinger pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 116341861fa8SNicholas Bellinger " ei_lba: 0x%08x\n", (unsigned long long)sector, 116441861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), ei_lba); 116541861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 116641861fa8SNicholas Bellinger } 116741861fa8SNicholas Bellinger 116841861fa8SNicholas Bellinger return 0; 116941861fa8SNicholas Bellinger } 117041861fa8SNicholas Bellinger 117141861fa8SNicholas Bellinger static void 117241861fa8SNicholas Bellinger sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 117341861fa8SNicholas Bellinger struct scatterlist *sg, int sg_off) 117441861fa8SNicholas Bellinger { 117541861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 117641861fa8SNicholas Bellinger struct scatterlist *psg; 117741861fa8SNicholas Bellinger void *paddr, *addr; 117841861fa8SNicholas Bellinger unsigned int i, len, left; 117910762e80SNicholas Bellinger unsigned int offset = sg_off; 118041861fa8SNicholas Bellinger 118141861fa8SNicholas Bellinger left = sectors * dev->prot_length; 118241861fa8SNicholas Bellinger 118341861fa8SNicholas Bellinger for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 118416c0ae02SSagi Grimberg unsigned int psg_len, copied = 0; 118541861fa8SNicholas Bellinger 118616c0ae02SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 118716c0ae02SSagi Grimberg psg_len = min(left, psg->length); 118816c0ae02SSagi Grimberg while (psg_len) { 118916c0ae02SSagi Grimberg len = min(psg_len, sg->length - offset); 119016c0ae02SSagi Grimberg addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 119116c0ae02SSagi Grimberg 119216c0ae02SSagi Grimberg if (read) 119316c0ae02SSagi Grimberg memcpy(paddr + copied, addr, len); 119416c0ae02SSagi Grimberg else 119516c0ae02SSagi Grimberg memcpy(addr, paddr + copied, len); 119616c0ae02SSagi Grimberg 119716c0ae02SSagi Grimberg left -= len; 119816c0ae02SSagi Grimberg offset += len; 119916c0ae02SSagi Grimberg copied += len; 120016c0ae02SSagi Grimberg psg_len -= len; 120116c0ae02SSagi Grimberg 1202d6a65fdcSSagi Grimberg if (offset >= sg->length) { 1203d6a65fdcSSagi Grimberg sg = sg_next(sg); 1204d6a65fdcSSagi Grimberg offset = 0; 1205d6a65fdcSSagi Grimberg } 120641861fa8SNicholas Bellinger kunmap_atomic(addr); 120741861fa8SNicholas Bellinger } 120816c0ae02SSagi Grimberg kunmap_atomic(paddr); 120916c0ae02SSagi Grimberg } 121041861fa8SNicholas Bellinger } 121141861fa8SNicholas Bellinger 121241861fa8SNicholas Bellinger sense_reason_t 121341861fa8SNicholas Bellinger sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, 121441861fa8SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 121541861fa8SNicholas Bellinger { 121641861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 121741861fa8SNicholas Bellinger struct se_dif_v1_tuple *sdt; 121841861fa8SNicholas Bellinger struct scatterlist *dsg, *psg = cmd->t_prot_sg; 121941861fa8SNicholas Bellinger sector_t sector = start; 122041861fa8SNicholas Bellinger void *daddr, *paddr; 122141861fa8SNicholas Bellinger int i, j, offset = 0; 122241861fa8SNicholas Bellinger sense_reason_t rc; 122341861fa8SNicholas Bellinger 122441861fa8SNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 122541861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 122641861fa8SNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 122741861fa8SNicholas Bellinger 122841861fa8SNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 122941861fa8SNicholas Bellinger 123041861fa8SNicholas Bellinger if (offset >= psg->length) { 123141861fa8SNicholas Bellinger kunmap_atomic(paddr); 123241861fa8SNicholas Bellinger psg = sg_next(psg); 123341861fa8SNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 123441861fa8SNicholas Bellinger offset = 0; 123541861fa8SNicholas Bellinger } 123641861fa8SNicholas Bellinger 123741861fa8SNicholas Bellinger sdt = paddr + offset; 123841861fa8SNicholas Bellinger 123941861fa8SNicholas Bellinger pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" 124041861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 124141861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 124241861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 124341861fa8SNicholas Bellinger 124441861fa8SNicholas Bellinger rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 124541861fa8SNicholas Bellinger ei_lba); 124641861fa8SNicholas Bellinger if (rc) { 124741861fa8SNicholas Bellinger kunmap_atomic(paddr); 124841861fa8SNicholas Bellinger kunmap_atomic(daddr); 124976736db3SSagi Grimberg cmd->bad_sector = sector; 125041861fa8SNicholas Bellinger return rc; 125141861fa8SNicholas Bellinger } 125241861fa8SNicholas Bellinger 125341861fa8SNicholas Bellinger sector++; 125441861fa8SNicholas Bellinger ei_lba++; 125541861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 125641861fa8SNicholas Bellinger } 125741861fa8SNicholas Bellinger 125841861fa8SNicholas Bellinger kunmap_atomic(paddr); 125941861fa8SNicholas Bellinger kunmap_atomic(daddr); 126041861fa8SNicholas Bellinger } 126141861fa8SNicholas Bellinger sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); 126241861fa8SNicholas Bellinger 126341861fa8SNicholas Bellinger return 0; 126441861fa8SNicholas Bellinger } 126541861fa8SNicholas Bellinger EXPORT_SYMBOL(sbc_dif_verify_write); 126641861fa8SNicholas Bellinger 1267395ccb25SNicholas Bellinger static sense_reason_t 1268395ccb25SNicholas Bellinger __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 126941861fa8SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 127041861fa8SNicholas Bellinger { 127141861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 127241861fa8SNicholas Bellinger struct se_dif_v1_tuple *sdt; 1273fc272ec7SSagi Grimberg struct scatterlist *dsg, *psg = sg; 127441861fa8SNicholas Bellinger sector_t sector = start; 127541861fa8SNicholas Bellinger void *daddr, *paddr; 127641861fa8SNicholas Bellinger int i, j, offset = sg_off; 127741861fa8SNicholas Bellinger sense_reason_t rc; 127841861fa8SNicholas Bellinger 127941861fa8SNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 128041861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1281fc272ec7SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + sg->offset; 128241861fa8SNicholas Bellinger 128341861fa8SNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 128441861fa8SNicholas Bellinger 1285fc272ec7SSagi Grimberg if (offset >= psg->length) { 128641861fa8SNicholas Bellinger kunmap_atomic(paddr); 1287fc272ec7SSagi Grimberg psg = sg_next(psg); 1288fc272ec7SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 128941861fa8SNicholas Bellinger offset = 0; 129041861fa8SNicholas Bellinger } 129141861fa8SNicholas Bellinger 129241861fa8SNicholas Bellinger sdt = paddr + offset; 129341861fa8SNicholas Bellinger 129441861fa8SNicholas Bellinger pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 129541861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 129641861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 129741861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 129841861fa8SNicholas Bellinger 129941861fa8SNicholas Bellinger if (sdt->app_tag == cpu_to_be16(0xffff)) { 130041861fa8SNicholas Bellinger sector++; 130141861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 130241861fa8SNicholas Bellinger continue; 130341861fa8SNicholas Bellinger } 130441861fa8SNicholas Bellinger 130541861fa8SNicholas Bellinger rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, 130641861fa8SNicholas Bellinger ei_lba); 130741861fa8SNicholas Bellinger if (rc) { 130841861fa8SNicholas Bellinger kunmap_atomic(paddr); 130941861fa8SNicholas Bellinger kunmap_atomic(daddr); 131076736db3SSagi Grimberg cmd->bad_sector = sector; 131141861fa8SNicholas Bellinger return rc; 131241861fa8SNicholas Bellinger } 131341861fa8SNicholas Bellinger 131441861fa8SNicholas Bellinger sector++; 131541861fa8SNicholas Bellinger ei_lba++; 131641861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 131741861fa8SNicholas Bellinger } 131841861fa8SNicholas Bellinger 131941861fa8SNicholas Bellinger kunmap_atomic(paddr); 132041861fa8SNicholas Bellinger kunmap_atomic(daddr); 132141861fa8SNicholas Bellinger } 132241861fa8SNicholas Bellinger 132341861fa8SNicholas Bellinger return 0; 132441861fa8SNicholas Bellinger } 1325395ccb25SNicholas Bellinger 1326395ccb25SNicholas Bellinger sense_reason_t 1327395ccb25SNicholas Bellinger sbc_dif_read_strip(struct se_cmd *cmd) 1328395ccb25SNicholas Bellinger { 1329395ccb25SNicholas Bellinger struct se_device *dev = cmd->se_dev; 1330395ccb25SNicholas Bellinger u32 sectors = cmd->prot_length / dev->prot_length; 1331395ccb25SNicholas Bellinger 1332395ccb25SNicholas Bellinger return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, 1333395ccb25SNicholas Bellinger cmd->t_prot_sg, 0); 1334395ccb25SNicholas Bellinger } 1335395ccb25SNicholas Bellinger 1336395ccb25SNicholas Bellinger sense_reason_t 1337395ccb25SNicholas Bellinger sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1338395ccb25SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1339395ccb25SNicholas Bellinger { 1340395ccb25SNicholas Bellinger sense_reason_t rc; 1341395ccb25SNicholas Bellinger 1342395ccb25SNicholas Bellinger rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); 1343395ccb25SNicholas Bellinger if (rc) 1344395ccb25SNicholas Bellinger return rc; 1345395ccb25SNicholas Bellinger 1346395ccb25SNicholas Bellinger sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); 1347395ccb25SNicholas Bellinger return 0; 1348395ccb25SNicholas Bellinger } 134941861fa8SNicholas Bellinger EXPORT_SYMBOL(sbc_dif_verify_read); 1350