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 40afd73f1bSNicholas Bellinger sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 4162e46942SChristoph Hellwig static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); 42afd73f1bSNicholas Bellinger 43afd73f1bSNicholas Bellinger static sense_reason_t 44de103c93SChristoph Hellwig sbc_emulate_readcapacity(struct se_cmd *cmd) 451fd032eeSChristoph Hellwig { 461fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 478dc8632aSRoland Dreier unsigned char *cdb = cmd->t_task_cdb; 481fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 49a50da144SPaolo Bonzini unsigned char *rbuf; 50a50da144SPaolo Bonzini unsigned char buf[8]; 511fd032eeSChristoph Hellwig u32 blocks; 521fd032eeSChristoph Hellwig 538dc8632aSRoland Dreier /* 548dc8632aSRoland Dreier * SBC-2 says: 558dc8632aSRoland Dreier * If the PMI bit is set to zero and the LOGICAL BLOCK 568dc8632aSRoland Dreier * ADDRESS field is not set to zero, the device server shall 578dc8632aSRoland Dreier * terminate the command with CHECK CONDITION status with 588dc8632aSRoland Dreier * the sense key set to ILLEGAL REQUEST and the additional 598dc8632aSRoland Dreier * sense code set to INVALID FIELD IN CDB. 608dc8632aSRoland Dreier * 618dc8632aSRoland Dreier * In SBC-3, these fields are obsolete, but some SCSI 628dc8632aSRoland Dreier * compliance tests actually check this, so we might as well 638dc8632aSRoland Dreier * follow SBC-2. 648dc8632aSRoland Dreier */ 658dc8632aSRoland Dreier if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 668dc8632aSRoland Dreier return TCM_INVALID_CDB_FIELD; 678dc8632aSRoland Dreier 681fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 691fd032eeSChristoph Hellwig blocks = 0xffffffff; 701fd032eeSChristoph Hellwig else 711fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 721fd032eeSChristoph Hellwig 731fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 741fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 751fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 761fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 770fd97ccfSChristoph Hellwig buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 780fd97ccfSChristoph Hellwig buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 790fd97ccfSChristoph Hellwig buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 800fd97ccfSChristoph Hellwig buf[7] = dev->dev_attrib.block_size & 0xff; 811fd032eeSChristoph Hellwig 82a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 838b4b0dcbSNicholas Bellinger if (rbuf) { 84a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 851fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 868b4b0dcbSNicholas Bellinger } 871fd032eeSChristoph Hellwig 882426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 8); 891fd032eeSChristoph Hellwig return 0; 901fd032eeSChristoph Hellwig } 911fd032eeSChristoph Hellwig 92de103c93SChristoph Hellwig static sense_reason_t 93de103c93SChristoph Hellwig sbc_emulate_readcapacity_16(struct se_cmd *cmd) 941fd032eeSChristoph Hellwig { 951fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 962d335983SNicholas Bellinger struct se_session *sess = cmd->se_sess; 979ef5466eSNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 989ef5466eSNicholas Bellinger 99a50da144SPaolo Bonzini unsigned char *rbuf; 100a50da144SPaolo Bonzini unsigned char buf[32]; 1011fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 1021fd032eeSChristoph Hellwig 103a50da144SPaolo Bonzini memset(buf, 0, sizeof(buf)); 1041fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 1051fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 1061fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 1071fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 1081fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 1091fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 1101fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 1111fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 1120fd97ccfSChristoph Hellwig buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 1130fd97ccfSChristoph Hellwig buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 1140fd97ccfSChristoph Hellwig buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 1150fd97ccfSChristoph Hellwig buf[11] = dev->dev_attrib.block_size & 0xff; 11656dac14cSNicholas Bellinger /* 11756dac14cSNicholas Bellinger * Set P_TYPE and PROT_EN bits for DIF support 11856dac14cSNicholas Bellinger */ 1192d335983SNicholas Bellinger if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 1209ef5466eSNicholas Bellinger /* 1219ef5466eSNicholas Bellinger * Only override a device's pi_prot_type if no T10-PI is 1229ef5466eSNicholas Bellinger * available, and sess_prot_type has been explicitly enabled. 1239ef5466eSNicholas Bellinger */ 1249ef5466eSNicholas Bellinger if (!pi_prot_type) 1259ef5466eSNicholas Bellinger pi_prot_type = sess->sess_prot_type; 1269ef5466eSNicholas Bellinger 1279ef5466eSNicholas Bellinger if (pi_prot_type) 1289ef5466eSNicholas Bellinger buf[12] = (pi_prot_type - 1) << 1 | 0x1; 1292d335983SNicholas Bellinger } 1307f7caf6aSAndy Grover 1317f7caf6aSAndy Grover if (dev->transport->get_lbppbe) 1327f7caf6aSAndy Grover buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 1337f7caf6aSAndy Grover 1347f7caf6aSAndy Grover if (dev->transport->get_alignment_offset_lbas) { 1357f7caf6aSAndy Grover u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 1367f7caf6aSAndy Grover buf[14] = (lalba >> 8) & 0x3f; 1377f7caf6aSAndy Grover buf[15] = lalba & 0xff; 1387f7caf6aSAndy Grover } 1397f7caf6aSAndy Grover 1401fd032eeSChristoph Hellwig /* 1411fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 1421fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 1431fd032eeSChristoph Hellwig */ 1440fd97ccfSChristoph Hellwig if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 1457f7caf6aSAndy Grover buf[14] |= 0x80; 1461fd032eeSChristoph Hellwig 147a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 1488b4b0dcbSNicholas Bellinger if (rbuf) { 149a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1501fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1518b4b0dcbSNicholas Bellinger } 1521fd032eeSChristoph Hellwig 1532426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 32); 1541fd032eeSChristoph Hellwig return 0; 1551fd032eeSChristoph Hellwig } 1561fd032eeSChristoph Hellwig 157972b29c8SRoland Dreier sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 1581fd032eeSChristoph Hellwig { 1591fd032eeSChristoph Hellwig u32 num_blocks; 1601fd032eeSChristoph Hellwig 1611fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1621fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1631fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1641fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1651fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1661fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1671fd032eeSChristoph Hellwig 1681fd032eeSChristoph Hellwig /* 1691fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 1701fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 1711fd032eeSChristoph Hellwig */ 1726f974e8cSChristoph Hellwig if (num_blocks) 1736f974e8cSChristoph Hellwig return num_blocks; 1741fd032eeSChristoph Hellwig 1756f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 1766f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 1771fd032eeSChristoph Hellwig } 178972b29c8SRoland Dreier EXPORT_SYMBOL(sbc_get_write_same_sectors); 1791fd032eeSChristoph Hellwig 180de103c93SChristoph Hellwig static sense_reason_t 1811920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 1821a1ff38cSBernhard Kohl { 1831a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 1841a1ff38cSBernhard Kohl return 0; 1851a1ff38cSBernhard Kohl } 1861a1ff38cSBernhard Kohl 187d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 188d6e0175cSChristoph Hellwig { 1890fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 190d6e0175cSChristoph Hellwig } 191d6e0175cSChristoph Hellwig 192d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 193d6e0175cSChristoph Hellwig { 194d6e0175cSChristoph Hellwig /* 195d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 196d6e0175cSChristoph Hellwig * 197d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 198d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 199d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 200d6e0175cSChristoph Hellwig * written. 201d6e0175cSChristoph Hellwig */ 202d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 203d6e0175cSChristoph Hellwig } 204d6e0175cSChristoph Hellwig 205d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 206d6e0175cSChristoph Hellwig { 207d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 208d6e0175cSChristoph Hellwig } 209d6e0175cSChristoph Hellwig 210d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 211d6e0175cSChristoph Hellwig { 212d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 213d6e0175cSChristoph Hellwig } 214d6e0175cSChristoph Hellwig 215d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 216d6e0175cSChristoph Hellwig { 217d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 218d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 219d6e0175cSChristoph Hellwig } 220d6e0175cSChristoph Hellwig 221d6e0175cSChristoph Hellwig /* 222d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 223d6e0175cSChristoph Hellwig */ 224d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 225d6e0175cSChristoph Hellwig { 226d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 227d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 228d6e0175cSChristoph Hellwig 229d6e0175cSChristoph Hellwig } 230d6e0175cSChristoph Hellwig 231d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 232d6e0175cSChristoph Hellwig { 233d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 234d6e0175cSChristoph Hellwig } 235d6e0175cSChristoph Hellwig 236d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 237d6e0175cSChristoph Hellwig { 238d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 239d6e0175cSChristoph Hellwig } 240d6e0175cSChristoph Hellwig 241d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 242d6e0175cSChristoph Hellwig { 243d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 244d6e0175cSChristoph Hellwig 245d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 246d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 247d6e0175cSChristoph Hellwig 248d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 249d6e0175cSChristoph Hellwig } 250d6e0175cSChristoph Hellwig 251d6e0175cSChristoph Hellwig /* 252d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 253d6e0175cSChristoph Hellwig */ 254d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 255d6e0175cSChristoph Hellwig { 256d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 257d6e0175cSChristoph Hellwig 258d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 259d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 260d6e0175cSChristoph Hellwig 261d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 262d6e0175cSChristoph Hellwig } 263d6e0175cSChristoph Hellwig 264cd063befSNicholas Bellinger static sense_reason_t 265cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 266d6e0175cSChristoph Hellwig { 2678e575c50SNicholas Bellinger struct se_device *dev = cmd->se_dev; 2688e575c50SNicholas Bellinger sector_t end_lba = dev->transport->get_blocks(dev) + 1; 269972b29c8SRoland Dreier unsigned int sectors = sbc_get_write_same_sectors(cmd); 270afd73f1bSNicholas Bellinger sense_reason_t ret; 271773cbaf7SNicholas Bellinger 272d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 273d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 274d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 275d6e0175cSChristoph Hellwig " Emulation\n"); 276cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 277d6e0175cSChristoph Hellwig } 278773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 279773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 280773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 281773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 282773cbaf7SNicholas Bellinger } 2838e575c50SNicholas Bellinger /* 2848e575c50SNicholas Bellinger * Sanity check for LBA wrap and request past end of device. 2858e575c50SNicholas Bellinger */ 2868e575c50SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 2878e575c50SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 2888e575c50SNicholas Bellinger pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 2898e575c50SNicholas Bellinger (unsigned long long)end_lba, cmd->t_task_lba, sectors); 2908e575c50SNicholas Bellinger return TCM_ADDRESS_OUT_OF_RANGE; 2918e575c50SNicholas Bellinger } 2928e575c50SNicholas Bellinger 2935cb770bfSRoland Dreier /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 2945cb770bfSRoland Dreier if (flags[0] & 0x10) { 2955cb770bfSRoland Dreier pr_warn("WRITE SAME with ANCHOR not supported\n"); 2965cb770bfSRoland Dreier return TCM_INVALID_CDB_FIELD; 2975cb770bfSRoland Dreier } 298d6e0175cSChristoph Hellwig /* 299cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 300cd063befSNicholas Bellinger * translated into block discard requests within backend code. 301d6e0175cSChristoph Hellwig */ 302cd063befSNicholas Bellinger if (flags[0] & 0x08) { 303cd063befSNicholas Bellinger if (!ops->execute_write_same_unmap) 304cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 305d6e0175cSChristoph Hellwig 306d0a91295SNicholas Bellinger if (!dev->dev_attrib.emulate_tpws) { 307d0a91295SNicholas Bellinger pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 308d0a91295SNicholas Bellinger " has emulate_tpws disabled\n"); 309d0a91295SNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 310d0a91295SNicholas Bellinger } 311cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same_unmap; 312cd063befSNicholas Bellinger return 0; 313cd063befSNicholas Bellinger } 314cd063befSNicholas Bellinger if (!ops->execute_write_same) 315cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 316cd063befSNicholas Bellinger 317afd73f1bSNicholas Bellinger ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 318afd73f1bSNicholas Bellinger if (ret) 319afd73f1bSNicholas Bellinger return ret; 320afd73f1bSNicholas Bellinger 321cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 322d6e0175cSChristoph Hellwig return 0; 323d6e0175cSChristoph Hellwig } 324d6e0175cSChristoph Hellwig 325c8e63985SNicholas Bellinger static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) 326d6e0175cSChristoph Hellwig { 327d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 328d6e0175cSChristoph Hellwig struct scatterlist *sg; 329d6e0175cSChristoph Hellwig unsigned int offset; 330a6b0133cSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 331a6b0133cSNicholas Bellinger int i, count; 332d6e0175cSChristoph Hellwig /* 333d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 334d6e0175cSChristoph Hellwig * 335d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 336d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 337d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 338d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 339d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 340d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 341d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 342d6e0175cSChristoph Hellwig */ 343d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 344d6e0175cSChristoph Hellwig if (!buf) { 345d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 346a6b0133cSNicholas Bellinger return TCM_OUT_OF_RESOURCES; 347d6e0175cSChristoph Hellwig } 348d6e0175cSChristoph Hellwig /* 349d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 350d6e0175cSChristoph Hellwig * into the locally allocated *buf 351d6e0175cSChristoph Hellwig */ 352d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 353d6e0175cSChristoph Hellwig cmd->t_data_nents, 354d6e0175cSChristoph Hellwig buf, 355d6e0175cSChristoph Hellwig cmd->data_length); 356d6e0175cSChristoph Hellwig 357d6e0175cSChristoph Hellwig /* 358d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 359d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 360d6e0175cSChristoph Hellwig */ 361d6e0175cSChristoph Hellwig 362d6e0175cSChristoph Hellwig offset = 0; 363d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 364d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 365a6b0133cSNicholas Bellinger if (!addr) { 366a6b0133cSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 367d6e0175cSChristoph Hellwig goto out; 368a6b0133cSNicholas Bellinger } 369d6e0175cSChristoph Hellwig 370d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 371d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 372d6e0175cSChristoph Hellwig 373d6e0175cSChristoph Hellwig offset += sg->length; 374d6e0175cSChristoph Hellwig kunmap_atomic(addr); 375d6e0175cSChristoph Hellwig } 376d6e0175cSChristoph Hellwig 377d6e0175cSChristoph Hellwig out: 378d6e0175cSChristoph Hellwig kfree(buf); 379a6b0133cSNicholas Bellinger return ret; 380d6e0175cSChristoph Hellwig } 381d6e0175cSChristoph Hellwig 382a82a9538SNicholas Bellinger static sense_reason_t 383a82a9538SNicholas Bellinger sbc_execute_rw(struct se_cmd *cmd) 384a82a9538SNicholas Bellinger { 3857a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 3867a971b1bSChristoph Hellwig 3877a971b1bSChristoph Hellwig return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 388a82a9538SNicholas Bellinger cmd->data_direction); 389a82a9538SNicholas Bellinger } 390a82a9538SNicholas Bellinger 391c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) 39268ff9b9bSNicholas Bellinger { 39368ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 39468ff9b9bSNicholas Bellinger 395d8855c15SNicholas Bellinger /* 396d8855c15SNicholas Bellinger * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 397d8855c15SNicholas Bellinger * within target_complete_ok_work() if the command was successfully 398d8855c15SNicholas Bellinger * sent to the backend driver. 399d8855c15SNicholas Bellinger */ 400d8855c15SNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 401d8855c15SNicholas Bellinger if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 40268ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 403d8855c15SNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 404d8855c15SNicholas Bellinger 40568ff9b9bSNicholas Bellinger /* 40668ff9b9bSNicholas Bellinger * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 40768ff9b9bSNicholas Bellinger * before the original READ I/O submission. 40868ff9b9bSNicholas Bellinger */ 40968ff9b9bSNicholas Bellinger up(&dev->caw_sem); 41068ff9b9bSNicholas Bellinger 41168ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 41268ff9b9bSNicholas Bellinger } 41368ff9b9bSNicholas Bellinger 414c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) 41568ff9b9bSNicholas Bellinger { 41668ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 41768ff9b9bSNicholas Bellinger struct scatterlist *write_sg = NULL, *sg; 418db60df88SNicholas Bellinger unsigned char *buf = NULL, *addr; 41968ff9b9bSNicholas Bellinger struct sg_mapping_iter m; 42068ff9b9bSNicholas Bellinger unsigned int offset = 0, len; 42168ff9b9bSNicholas Bellinger unsigned int nlbas = cmd->t_task_nolb; 42268ff9b9bSNicholas Bellinger unsigned int block_size = dev->dev_attrib.block_size; 42368ff9b9bSNicholas Bellinger unsigned int compare_len = (nlbas * block_size); 42468ff9b9bSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 42568ff9b9bSNicholas Bellinger int rc, i; 42668ff9b9bSNicholas Bellinger 427cf6d1f09SNicholas Bellinger /* 428cf6d1f09SNicholas Bellinger * Handle early failure in transport_generic_request_failure(), 429c8e63985SNicholas Bellinger * which will not have taken ->caw_sem yet.. 430cf6d1f09SNicholas Bellinger */ 431c8e63985SNicholas Bellinger if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 432cf6d1f09SNicholas Bellinger return TCM_NO_SENSE; 433db60df88SNicholas Bellinger /* 434c8e63985SNicholas Bellinger * Handle special case for zero-length COMPARE_AND_WRITE 435c8e63985SNicholas Bellinger */ 436c8e63985SNicholas Bellinger if (!cmd->data_length) 437c8e63985SNicholas Bellinger goto out; 438c8e63985SNicholas Bellinger /* 439db60df88SNicholas Bellinger * Immediately exit + release dev->caw_sem if command has already 440db60df88SNicholas Bellinger * been failed with a non-zero SCSI status. 441db60df88SNicholas Bellinger */ 442db60df88SNicholas Bellinger if (cmd->scsi_status) { 443db60df88SNicholas Bellinger pr_err("compare_and_write_callback: non zero scsi_status:" 444db60df88SNicholas Bellinger " 0x%02x\n", cmd->scsi_status); 445db60df88SNicholas Bellinger goto out; 446db60df88SNicholas Bellinger } 447cf6d1f09SNicholas Bellinger 44868ff9b9bSNicholas Bellinger buf = kzalloc(cmd->data_length, GFP_KERNEL); 44968ff9b9bSNicholas Bellinger if (!buf) { 45068ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write buf\n"); 451a2890087SNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 452a2890087SNicholas Bellinger goto out; 45368ff9b9bSNicholas Bellinger } 45468ff9b9bSNicholas Bellinger 455a1e1774cSMartin Svec write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 45668ff9b9bSNicholas Bellinger GFP_KERNEL); 45768ff9b9bSNicholas Bellinger if (!write_sg) { 45868ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write sg\n"); 45968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 46068ff9b9bSNicholas Bellinger goto out; 46168ff9b9bSNicholas Bellinger } 462a1e1774cSMartin Svec sg_init_table(write_sg, cmd->t_data_nents); 46368ff9b9bSNicholas Bellinger /* 46468ff9b9bSNicholas Bellinger * Setup verify and write data payloads from total NumberLBAs. 46568ff9b9bSNicholas Bellinger */ 46668ff9b9bSNicholas Bellinger rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 46768ff9b9bSNicholas Bellinger cmd->data_length); 46868ff9b9bSNicholas Bellinger if (!rc) { 46968ff9b9bSNicholas Bellinger pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 47068ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 47168ff9b9bSNicholas Bellinger goto out; 47268ff9b9bSNicholas Bellinger } 47368ff9b9bSNicholas Bellinger /* 47468ff9b9bSNicholas Bellinger * Compare against SCSI READ payload against verify payload 47568ff9b9bSNicholas Bellinger */ 47668ff9b9bSNicholas Bellinger for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 47768ff9b9bSNicholas Bellinger addr = (unsigned char *)kmap_atomic(sg_page(sg)); 47868ff9b9bSNicholas Bellinger if (!addr) { 47968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 48068ff9b9bSNicholas Bellinger goto out; 48168ff9b9bSNicholas Bellinger } 48268ff9b9bSNicholas Bellinger 48368ff9b9bSNicholas Bellinger len = min(sg->length, compare_len); 48468ff9b9bSNicholas Bellinger 48568ff9b9bSNicholas Bellinger if (memcmp(addr, buf + offset, len)) { 48668ff9b9bSNicholas Bellinger pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 48768ff9b9bSNicholas Bellinger addr, buf + offset); 48868ff9b9bSNicholas Bellinger kunmap_atomic(addr); 48968ff9b9bSNicholas Bellinger goto miscompare; 49068ff9b9bSNicholas Bellinger } 49168ff9b9bSNicholas Bellinger kunmap_atomic(addr); 49268ff9b9bSNicholas Bellinger 49368ff9b9bSNicholas Bellinger offset += len; 49468ff9b9bSNicholas Bellinger compare_len -= len; 49568ff9b9bSNicholas Bellinger if (!compare_len) 49668ff9b9bSNicholas Bellinger break; 49768ff9b9bSNicholas Bellinger } 49868ff9b9bSNicholas Bellinger 49968ff9b9bSNicholas Bellinger i = 0; 50068ff9b9bSNicholas Bellinger len = cmd->t_task_nolb * block_size; 50168ff9b9bSNicholas Bellinger sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 50268ff9b9bSNicholas Bellinger /* 50368ff9b9bSNicholas Bellinger * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 50468ff9b9bSNicholas Bellinger */ 50568ff9b9bSNicholas Bellinger while (len) { 50668ff9b9bSNicholas Bellinger sg_miter_next(&m); 50768ff9b9bSNicholas Bellinger 50868ff9b9bSNicholas Bellinger if (block_size < PAGE_SIZE) { 50968ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 51068ff9b9bSNicholas Bellinger block_size); 51168ff9b9bSNicholas Bellinger } else { 51268ff9b9bSNicholas Bellinger sg_miter_next(&m); 51368ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 51468ff9b9bSNicholas Bellinger 0); 51568ff9b9bSNicholas Bellinger } 51668ff9b9bSNicholas Bellinger len -= block_size; 51768ff9b9bSNicholas Bellinger i++; 51868ff9b9bSNicholas Bellinger } 51968ff9b9bSNicholas Bellinger sg_miter_stop(&m); 52068ff9b9bSNicholas Bellinger /* 52168ff9b9bSNicholas Bellinger * Save the original SGL + nents values before updating to new 52268ff9b9bSNicholas Bellinger * assignments, to be released in transport_free_pages() -> 52368ff9b9bSNicholas Bellinger * transport_reset_sgl_orig() 52468ff9b9bSNicholas Bellinger */ 52568ff9b9bSNicholas Bellinger cmd->t_data_sg_orig = cmd->t_data_sg; 52668ff9b9bSNicholas Bellinger cmd->t_data_sg = write_sg; 52768ff9b9bSNicholas Bellinger cmd->t_data_nents_orig = cmd->t_data_nents; 52868ff9b9bSNicholas Bellinger cmd->t_data_nents = 1; 52968ff9b9bSNicholas Bellinger 53068d81f40SChristoph Hellwig cmd->sam_task_attr = TCM_HEAD_TAG; 53168ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_post; 53268ff9b9bSNicholas Bellinger /* 53368ff9b9bSNicholas Bellinger * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 53468ff9b9bSNicholas Bellinger * for submitting the adjusted SGL to write instance user-data. 53568ff9b9bSNicholas Bellinger */ 53668ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 53768ff9b9bSNicholas Bellinger 53868ff9b9bSNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 53968ff9b9bSNicholas Bellinger cmd->t_state = TRANSPORT_PROCESSING; 54068ff9b9bSNicholas Bellinger cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 54168ff9b9bSNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 54268ff9b9bSNicholas Bellinger 54368ff9b9bSNicholas Bellinger __target_execute_cmd(cmd); 54468ff9b9bSNicholas Bellinger 54568ff9b9bSNicholas Bellinger kfree(buf); 54668ff9b9bSNicholas Bellinger return ret; 54768ff9b9bSNicholas Bellinger 54868ff9b9bSNicholas Bellinger miscompare: 54968ff9b9bSNicholas Bellinger pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 55068ff9b9bSNicholas Bellinger dev->transport->name); 55168ff9b9bSNicholas Bellinger ret = TCM_MISCOMPARE_VERIFY; 55268ff9b9bSNicholas Bellinger out: 55368ff9b9bSNicholas Bellinger /* 55468ff9b9bSNicholas Bellinger * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 55568ff9b9bSNicholas Bellinger * sbc_compare_and_write() before the original READ I/O submission. 55668ff9b9bSNicholas Bellinger */ 55768ff9b9bSNicholas Bellinger up(&dev->caw_sem); 55868ff9b9bSNicholas Bellinger kfree(write_sg); 55968ff9b9bSNicholas Bellinger kfree(buf); 56068ff9b9bSNicholas Bellinger return ret; 56168ff9b9bSNicholas Bellinger } 56268ff9b9bSNicholas Bellinger 56368ff9b9bSNicholas Bellinger static sense_reason_t 56468ff9b9bSNicholas Bellinger sbc_compare_and_write(struct se_cmd *cmd) 56568ff9b9bSNicholas Bellinger { 5667a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 56768ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 56868ff9b9bSNicholas Bellinger sense_reason_t ret; 56968ff9b9bSNicholas Bellinger int rc; 57068ff9b9bSNicholas Bellinger /* 57168ff9b9bSNicholas Bellinger * Submit the READ first for COMPARE_AND_WRITE to perform the 57268ff9b9bSNicholas Bellinger * comparision using SGLs at cmd->t_bidi_data_sg.. 57368ff9b9bSNicholas Bellinger */ 57468ff9b9bSNicholas Bellinger rc = down_interruptible(&dev->caw_sem); 575ee7619f2SNicholas Bellinger if (rc != 0) { 57668ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 57768ff9b9bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57868ff9b9bSNicholas Bellinger } 579b7191253SNicholas Bellinger /* 580b7191253SNicholas Bellinger * Reset cmd->data_length to individual block_size in order to not 581b7191253SNicholas Bellinger * confuse backend drivers that depend on this value matching the 582b7191253SNicholas Bellinger * size of the I/O being submitted. 583b7191253SNicholas Bellinger */ 584b7191253SNicholas Bellinger cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 58568ff9b9bSNicholas Bellinger 5867a971b1bSChristoph Hellwig ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 58768ff9b9bSNicholas Bellinger DMA_FROM_DEVICE); 58868ff9b9bSNicholas Bellinger if (ret) { 58968ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 59068ff9b9bSNicholas Bellinger up(&dev->caw_sem); 59168ff9b9bSNicholas Bellinger return ret; 59268ff9b9bSNicholas Bellinger } 59368ff9b9bSNicholas Bellinger /* 59468ff9b9bSNicholas Bellinger * Unlock of dev->caw_sem to occur in compare_and_write_callback() 59568ff9b9bSNicholas Bellinger * upon MISCOMPARE, or in compare_and_write_done() upon completion 59668ff9b9bSNicholas Bellinger * of WRITE instance user-data. 59768ff9b9bSNicholas Bellinger */ 59868ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 59968ff9b9bSNicholas Bellinger } 60068ff9b9bSNicholas Bellinger 60119f9361aSSagi Grimberg static int 60238b57f82SNicholas Bellinger sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 60319f9361aSSagi Grimberg bool is_write, struct se_cmd *cmd) 60419f9361aSSagi Grimberg { 60519f9361aSSagi Grimberg if (is_write) { 60638b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 60738b57f82SNicholas Bellinger protect ? TARGET_PROT_DOUT_PASS : 60819f9361aSSagi Grimberg TARGET_PROT_DOUT_INSERT; 60919f9361aSSagi Grimberg switch (protect) { 61019f9361aSSagi Grimberg case 0x0: 61119f9361aSSagi Grimberg case 0x3: 61219f9361aSSagi Grimberg cmd->prot_checks = 0; 61319f9361aSSagi Grimberg break; 61419f9361aSSagi Grimberg case 0x1: 61519f9361aSSagi Grimberg case 0x5: 61619f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 61719f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 61819f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 61919f9361aSSagi Grimberg break; 62019f9361aSSagi Grimberg case 0x2: 62119f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 62219f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 62319f9361aSSagi Grimberg break; 62419f9361aSSagi Grimberg case 0x4: 62519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 62619f9361aSSagi Grimberg break; 62719f9361aSSagi Grimberg default: 62819f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 62919f9361aSSagi Grimberg return -EINVAL; 63019f9361aSSagi Grimberg } 63119f9361aSSagi Grimberg } else { 63238b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 63338b57f82SNicholas Bellinger protect ? TARGET_PROT_DIN_PASS : 63419f9361aSSagi Grimberg TARGET_PROT_DIN_STRIP; 63519f9361aSSagi Grimberg switch (protect) { 63619f9361aSSagi Grimberg case 0x0: 63719f9361aSSagi Grimberg case 0x1: 63819f9361aSSagi Grimberg case 0x5: 63919f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 64019f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 64119f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 64219f9361aSSagi Grimberg break; 64319f9361aSSagi Grimberg case 0x2: 64419f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 64519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 64619f9361aSSagi Grimberg break; 64719f9361aSSagi Grimberg case 0x3: 64819f9361aSSagi Grimberg cmd->prot_checks = 0; 64919f9361aSSagi Grimberg break; 65019f9361aSSagi Grimberg case 0x4: 65119f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 65219f9361aSSagi Grimberg break; 65319f9361aSSagi Grimberg default: 65419f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 65519f9361aSSagi Grimberg return -EINVAL; 65619f9361aSSagi Grimberg } 65719f9361aSSagi Grimberg } 65819f9361aSSagi Grimberg 65919f9361aSSagi Grimberg return 0; 66019f9361aSSagi Grimberg } 66119f9361aSSagi Grimberg 662f7b7c06fSNicholas Bellinger static sense_reason_t 663499bf77bSNicholas Bellinger sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 66419f9361aSSagi Grimberg u32 sectors, bool is_write) 665499bf77bSNicholas Bellinger { 66619f9361aSSagi Grimberg u8 protect = cdb[1] >> 5; 66738b57f82SNicholas Bellinger int sp_ops = cmd->se_sess->sup_prot_ops; 66838b57f82SNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 66938b57f82SNicholas Bellinger bool fabric_prot = false; 67019f9361aSSagi Grimberg 671f7b7c06fSNicholas Bellinger if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 67238b57f82SNicholas Bellinger if (unlikely(protect && 67338b57f82SNicholas Bellinger !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 67438b57f82SNicholas Bellinger pr_err("CDB contains protect bit, but device + fabric does" 67538b57f82SNicholas Bellinger " not advertise PROTECT=1 feature bit\n"); 676f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 677f7b7c06fSNicholas Bellinger } 678f7b7c06fSNicholas Bellinger if (cmd->prot_pto) 679f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 680f7b7c06fSNicholas Bellinger } 681499bf77bSNicholas Bellinger 682499bf77bSNicholas Bellinger switch (dev->dev_attrib.pi_prot_type) { 683499bf77bSNicholas Bellinger case TARGET_DIF_TYPE3_PROT: 684499bf77bSNicholas Bellinger cmd->reftag_seed = 0xffffffff; 685499bf77bSNicholas Bellinger break; 686499bf77bSNicholas Bellinger case TARGET_DIF_TYPE2_PROT: 68719f9361aSSagi Grimberg if (protect) 688f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 689499bf77bSNicholas Bellinger 690499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 691499bf77bSNicholas Bellinger break; 692499bf77bSNicholas Bellinger case TARGET_DIF_TYPE1_PROT: 693499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 694499bf77bSNicholas Bellinger break; 695499bf77bSNicholas Bellinger case TARGET_DIF_TYPE0_PROT: 69638b57f82SNicholas Bellinger /* 69738b57f82SNicholas Bellinger * See if the fabric supports T10-PI, and the session has been 69838b57f82SNicholas Bellinger * configured to allow export PROTECT=1 feature bit with backend 69938b57f82SNicholas Bellinger * devices that don't support T10-PI. 70038b57f82SNicholas Bellinger */ 70138b57f82SNicholas Bellinger fabric_prot = is_write ? 70238b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 70338b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 70438b57f82SNicholas Bellinger 70538b57f82SNicholas Bellinger if (fabric_prot && cmd->se_sess->sess_prot_type) { 70638b57f82SNicholas Bellinger pi_prot_type = cmd->se_sess->sess_prot_type; 70738b57f82SNicholas Bellinger break; 70838b57f82SNicholas Bellinger } 709cceca4a6SNicholas Bellinger if (!protect) 710f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 71138b57f82SNicholas Bellinger /* Fallthrough */ 712499bf77bSNicholas Bellinger default: 713cceca4a6SNicholas Bellinger pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 714cceca4a6SNicholas Bellinger "PROTECT: 0x%02x\n", cdb[0], protect); 715cceca4a6SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 716499bf77bSNicholas Bellinger } 717499bf77bSNicholas Bellinger 71838b57f82SNicholas Bellinger if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 719f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 72019f9361aSSagi Grimberg 72138b57f82SNicholas Bellinger cmd->prot_type = pi_prot_type; 722499bf77bSNicholas Bellinger cmd->prot_length = dev->prot_length * sectors; 723e2a4f55cSSagi Grimberg 724e2a4f55cSSagi Grimberg /** 725e2a4f55cSSagi Grimberg * In case protection information exists over the wire 726e2a4f55cSSagi Grimberg * we modify command data length to describe pure data. 727e2a4f55cSSagi Grimberg * The actual transfer length is data length + protection 728e2a4f55cSSagi Grimberg * length 729e2a4f55cSSagi Grimberg **/ 730e2a4f55cSSagi Grimberg if (protect) 731e2a4f55cSSagi Grimberg cmd->data_length = sectors * dev->dev_attrib.block_size; 732e2a4f55cSSagi Grimberg 733e2a4f55cSSagi Grimberg pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 734e2a4f55cSSagi Grimberg "prot_op=%d prot_checks=%d\n", 735e2a4f55cSSagi Grimberg __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 73603abad9eSSagi Grimberg cmd->prot_op, cmd->prot_checks); 737499bf77bSNicholas Bellinger 738f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 739499bf77bSNicholas Bellinger } 740499bf77bSNicholas Bellinger 741fde9f50fSNicholas Bellinger static int 742fde9f50fSNicholas Bellinger sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 743fde9f50fSNicholas Bellinger { 744fde9f50fSNicholas Bellinger if (cdb[1] & 0x10) { 745814e5b45SChristoph Hellwig /* see explanation in spc_emulate_modesense */ 746814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 747fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with DPO bit set, but device" 748fde9f50fSNicholas Bellinger " does not advertise support for DPO\n", cdb[0]); 749fde9f50fSNicholas Bellinger return -EINVAL; 750fde9f50fSNicholas Bellinger } 751fde9f50fSNicholas Bellinger } 752fde9f50fSNicholas Bellinger if (cdb[1] & 0x8) { 753814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 754fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with FUA bit set, but device" 755fde9f50fSNicholas Bellinger " does not advertise support for FUA write\n", 756fde9f50fSNicholas Bellinger cdb[0]); 757fde9f50fSNicholas Bellinger return -EINVAL; 758fde9f50fSNicholas Bellinger } 759fde9f50fSNicholas Bellinger cmd->se_cmd_flags |= SCF_FUA; 760fde9f50fSNicholas Bellinger } 761fde9f50fSNicholas Bellinger return 0; 762d6e0175cSChristoph Hellwig } 763d6e0175cSChristoph Hellwig 764de103c93SChristoph Hellwig sense_reason_t 765de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 766d6e0175cSChristoph Hellwig { 767d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 768d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 7691fd032eeSChristoph Hellwig unsigned int size; 770d6e0175cSChristoph Hellwig u32 sectors = 0; 771de103c93SChristoph Hellwig sense_reason_t ret; 772d6e0175cSChristoph Hellwig 7737a971b1bSChristoph Hellwig cmd->protocol_data = ops; 7747a971b1bSChristoph Hellwig 775d6e0175cSChristoph Hellwig switch (cdb[0]) { 776d6e0175cSChristoph Hellwig case READ_6: 777d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 778d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 779d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 780a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 781d6e0175cSChristoph Hellwig break; 782d6e0175cSChristoph Hellwig case READ_10: 783d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 784d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 785499bf77bSNicholas Bellinger 786fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 787fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 788fde9f50fSNicholas Bellinger 789f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 790f7b7c06fSNicholas Bellinger if (ret) 791f7b7c06fSNicholas Bellinger return ret; 792499bf77bSNicholas Bellinger 793d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 794a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 795d6e0175cSChristoph Hellwig break; 796d6e0175cSChristoph Hellwig case READ_12: 797d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 798d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 799499bf77bSNicholas Bellinger 800fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 801fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 802fde9f50fSNicholas Bellinger 803f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 804f7b7c06fSNicholas Bellinger if (ret) 805f7b7c06fSNicholas Bellinger return ret; 806499bf77bSNicholas Bellinger 807d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 808a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 809d6e0175cSChristoph Hellwig break; 810d6e0175cSChristoph Hellwig case READ_16: 811d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 812d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 813499bf77bSNicholas Bellinger 814fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 815fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 816fde9f50fSNicholas Bellinger 817f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 818f7b7c06fSNicholas Bellinger if (ret) 819f7b7c06fSNicholas Bellinger return ret; 820499bf77bSNicholas Bellinger 821d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 822a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 823d6e0175cSChristoph Hellwig break; 824d6e0175cSChristoph Hellwig case WRITE_6: 825d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 826d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 827d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 828a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 829d6e0175cSChristoph Hellwig break; 830d6e0175cSChristoph Hellwig case WRITE_10: 831d6e0175cSChristoph Hellwig case WRITE_VERIFY: 832d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 833d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 834499bf77bSNicholas Bellinger 835fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 836fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 837499bf77bSNicholas Bellinger 838f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 839f7b7c06fSNicholas Bellinger if (ret) 840f7b7c06fSNicholas Bellinger return ret; 841d6e0175cSChristoph Hellwig 842d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 843a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 844d6e0175cSChristoph Hellwig break; 845d6e0175cSChristoph Hellwig case WRITE_12: 846d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 847d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 848499bf77bSNicholas Bellinger 849fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 850fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 851499bf77bSNicholas Bellinger 852f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 853f7b7c06fSNicholas Bellinger if (ret) 854f7b7c06fSNicholas Bellinger return ret; 855d6e0175cSChristoph Hellwig 856d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 857a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 858d6e0175cSChristoph Hellwig break; 859d6e0175cSChristoph Hellwig case WRITE_16: 860d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 861d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 862499bf77bSNicholas Bellinger 863fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 864fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 865499bf77bSNicholas Bellinger 866f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 867f7b7c06fSNicholas Bellinger if (ret) 868f7b7c06fSNicholas Bellinger return ret; 869cd063befSNicholas Bellinger 870d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 871d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 872d6e0175cSChristoph Hellwig break; 873d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 874d6e0175cSChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 875d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 876d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 877d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 878d6e0175cSChristoph Hellwig 879fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 880fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 881fde9f50fSNicholas Bellinger 882d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 883d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 884d6e0175cSChristoph Hellwig 885d6e0175cSChristoph Hellwig /* 886d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 887d6e0175cSChristoph Hellwig */ 888d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 889d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 8900c2ad7d1SChristoph Hellwig break; 891d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 892d6e0175cSChristoph Hellwig { 893d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 894d6e0175cSChristoph Hellwig switch (service_action) { 895d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 8966f974e8cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 897de103c93SChristoph Hellwig 898fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 899fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 9006f974e8cSChristoph Hellwig /* 901d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 902d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 903d6e0175cSChristoph Hellwig */ 904d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 905de103c93SChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 906d6e0175cSChristoph Hellwig 907d6e0175cSChristoph Hellwig /* 9081fd032eeSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 909d6e0175cSChristoph Hellwig * completion. 910d6e0175cSChristoph Hellwig */ 911de103c93SChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 9126f974e8cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 913d6e0175cSChristoph Hellwig break; 914d6e0175cSChristoph Hellwig case WRITE_SAME_32: 915d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 916d6e0175cSChristoph Hellwig if (!sectors) { 917d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 918d6e0175cSChristoph Hellwig " supported\n"); 919d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 920d6e0175cSChristoph Hellwig } 921d6e0175cSChristoph Hellwig 922d6e0175cSChristoph Hellwig size = sbc_get_size(cmd, 1); 923d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 924d6e0175cSChristoph Hellwig 925d6e0175cSChristoph Hellwig ret = sbc_setup_write_same(cmd, &cdb[10], ops); 926d6e0175cSChristoph Hellwig if (ret) 9271fd032eeSChristoph Hellwig return ret; 928d6e0175cSChristoph Hellwig break; 929d6e0175cSChristoph Hellwig default: 930d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 931d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 932de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 933d6e0175cSChristoph Hellwig } 934d6e0175cSChristoph Hellwig break; 935d6e0175cSChristoph Hellwig } 93668ff9b9bSNicholas Bellinger case COMPARE_AND_WRITE: 93768ff9b9bSNicholas Bellinger sectors = cdb[13]; 93868ff9b9bSNicholas Bellinger /* 93968ff9b9bSNicholas Bellinger * Currently enforce COMPARE_AND_WRITE for a single sector 94068ff9b9bSNicholas Bellinger */ 94168ff9b9bSNicholas Bellinger if (sectors > 1) { 94268ff9b9bSNicholas Bellinger pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 94368ff9b9bSNicholas Bellinger " than 1\n", sectors); 94468ff9b9bSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 94568ff9b9bSNicholas Bellinger } 94668ff9b9bSNicholas Bellinger /* 94768ff9b9bSNicholas Bellinger * Double size because we have two buffers, note that 94868ff9b9bSNicholas Bellinger * zero is not an error.. 94968ff9b9bSNicholas Bellinger */ 95068ff9b9bSNicholas Bellinger size = 2 * sbc_get_size(cmd, sectors); 95168ff9b9bSNicholas Bellinger cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 95268ff9b9bSNicholas Bellinger cmd->t_task_nolb = sectors; 95368ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 95468ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_compare_and_write; 95568ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_callback; 95668ff9b9bSNicholas Bellinger break; 957d6e0175cSChristoph Hellwig case READ_CAPACITY: 9581fd032eeSChristoph Hellwig size = READ_CAP_LEN; 9591fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 960d6e0175cSChristoph Hellwig break; 961eb846d9fSHannes Reinecke case SERVICE_ACTION_IN_16: 962d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 963d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 9641fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 965d6e0175cSChristoph Hellwig break; 966c66094bfSHannes Reinecke case SAI_REPORT_REFERRALS: 967c66094bfSHannes Reinecke cmd->execute_cmd = target_emulate_report_referrals; 968c66094bfSHannes Reinecke break; 969d6e0175cSChristoph Hellwig default: 970d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 971d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 972de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 973d6e0175cSChristoph Hellwig } 9741fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 975d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 976d6e0175cSChristoph Hellwig break; 977d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 978d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 979d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 980d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 981d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 982d6e0175cSChristoph Hellwig } else { 983d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 984d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 985d6e0175cSChristoph Hellwig } 9866ef31dc7SChristophe Vu-Brugier if (ops->execute_sync_cache) { 987ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 9886ef31dc7SChristophe Vu-Brugier goto check_lba; 9896ef31dc7SChristophe Vu-Brugier } 9906ef31dc7SChristophe Vu-Brugier size = 0; 9916ef31dc7SChristophe Vu-Brugier cmd->execute_cmd = sbc_emulate_noop; 992d6e0175cSChristoph Hellwig break; 993d6e0175cSChristoph Hellwig case UNMAP: 99414150a6bSChristoph Hellwig if (!ops->execute_unmap) 995de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 99614150a6bSChristoph Hellwig 99761fdb4acSNicholas Bellinger if (!dev->dev_attrib.emulate_tpu) { 99861fdb4acSNicholas Bellinger pr_err("Got UNMAP, but backend device has" 99961fdb4acSNicholas Bellinger " emulate_tpu disabled\n"); 100061fdb4acSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 100161fdb4acSNicholas Bellinger } 10021fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 100362e46942SChristoph Hellwig cmd->execute_cmd = sbc_execute_unmap; 1004d6e0175cSChristoph Hellwig break; 1005d6e0175cSChristoph Hellwig case WRITE_SAME_16: 1006d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1007d6e0175cSChristoph Hellwig if (!sectors) { 1008d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1009de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1010d6e0175cSChristoph Hellwig } 1011d6e0175cSChristoph Hellwig 10121fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1013d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1014d6e0175cSChristoph Hellwig 1015cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10166b64e1feSDan Carpenter if (ret) 1017cd063befSNicholas Bellinger return ret; 1018d6e0175cSChristoph Hellwig break; 1019d6e0175cSChristoph Hellwig case WRITE_SAME: 1020d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1021d6e0175cSChristoph Hellwig if (!sectors) { 1022d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1023de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1024d6e0175cSChristoph Hellwig } 1025d6e0175cSChristoph Hellwig 10261fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1027d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1028d6e0175cSChristoph Hellwig 1029d6e0175cSChristoph Hellwig /* 1030d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1031d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 1032d6e0175cSChristoph Hellwig */ 1033cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10346b64e1feSDan Carpenter if (ret) 1035cd063befSNicholas Bellinger return ret; 1036d6e0175cSChristoph Hellwig break; 1037d6e0175cSChristoph Hellwig case VERIFY: 10381fd032eeSChristoph Hellwig size = 0; 1039c52716deSChristophe Vu-Brugier sectors = transport_get_sectors_10(cdb); 1040c52716deSChristophe Vu-Brugier cmd->t_task_lba = transport_lba_32(cdb); 10411920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 1042c52716deSChristophe Vu-Brugier goto check_lba; 10431a1ff38cSBernhard Kohl case REZERO_UNIT: 10441a1ff38cSBernhard Kohl case SEEK_6: 10451a1ff38cSBernhard Kohl case SEEK_10: 10461a1ff38cSBernhard Kohl /* 10471a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 10481a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 10491a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 10501a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 10511a1ff38cSBernhard Kohl */ 10521a1ff38cSBernhard Kohl size = 0; 10531a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 10541a1ff38cSBernhard Kohl break; 1055d6e0175cSChristoph Hellwig default: 10561fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 1057d6e0175cSChristoph Hellwig if (ret) 1058d6e0175cSChristoph Hellwig return ret; 1059d6e0175cSChristoph Hellwig } 1060d6e0175cSChristoph Hellwig 1061d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 106220959c4bSAndy Grover if (!cmd->execute_cmd) 1063de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 1064d6e0175cSChristoph Hellwig 1065d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 10661fd032eeSChristoph Hellwig unsigned long long end_lba; 10676ef31dc7SChristophe Vu-Brugier check_lba: 10681fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 1069aa179935SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1070aa179935SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 10711fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 10721fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 10731fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 107409ceadc7SRoland Dreier return TCM_ADDRESS_OUT_OF_RANGE; 1075d6e0175cSChristoph Hellwig } 1076d6e0175cSChristoph Hellwig 107768ff9b9bSNicholas Bellinger if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 10781fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 10791fd032eeSChristoph Hellwig } 10801fd032eeSChristoph Hellwig 1081de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 1082d6e0175cSChristoph Hellwig } 1083d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 10846f23ac8aSChristoph Hellwig 10856f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 10866f23ac8aSChristoph Hellwig { 10876f23ac8aSChristoph Hellwig return TYPE_DISK; 10886f23ac8aSChristoph Hellwig } 10896f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 109086d71829SAsias He 109162e46942SChristoph Hellwig static sense_reason_t 109262e46942SChristoph Hellwig sbc_execute_unmap(struct se_cmd *cmd) 109386d71829SAsias He { 109462e46942SChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 109586d71829SAsias He struct se_device *dev = cmd->se_dev; 109686d71829SAsias He unsigned char *buf, *ptr = NULL; 109786d71829SAsias He sector_t lba; 109886d71829SAsias He int size; 109986d71829SAsias He u32 range; 110086d71829SAsias He sense_reason_t ret = 0; 110186d71829SAsias He int dl, bd_dl; 110286d71829SAsias He 110386d71829SAsias He /* We never set ANC_SUP */ 110486d71829SAsias He if (cmd->t_task_cdb[1]) 110586d71829SAsias He return TCM_INVALID_CDB_FIELD; 110686d71829SAsias He 110786d71829SAsias He if (cmd->data_length == 0) { 110886d71829SAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 110986d71829SAsias He return 0; 111086d71829SAsias He } 111186d71829SAsias He 111286d71829SAsias He if (cmd->data_length < 8) { 111386d71829SAsias He pr_warn("UNMAP parameter list length %u too small\n", 111486d71829SAsias He cmd->data_length); 111586d71829SAsias He return TCM_PARAMETER_LIST_LENGTH_ERROR; 111686d71829SAsias He } 111786d71829SAsias He 111886d71829SAsias He buf = transport_kmap_data_sg(cmd); 111986d71829SAsias He if (!buf) 112086d71829SAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 112186d71829SAsias He 112286d71829SAsias He dl = get_unaligned_be16(&buf[0]); 112386d71829SAsias He bd_dl = get_unaligned_be16(&buf[2]); 112486d71829SAsias He 112586d71829SAsias He size = cmd->data_length - 8; 112686d71829SAsias He if (bd_dl > size) 112786d71829SAsias He pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 112886d71829SAsias He cmd->data_length, bd_dl); 112986d71829SAsias He else 113086d71829SAsias He size = bd_dl; 113186d71829SAsias He 113286d71829SAsias He if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 113386d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 113486d71829SAsias He goto err; 113586d71829SAsias He } 113686d71829SAsias He 113786d71829SAsias He /* First UNMAP block descriptor starts at 8 byte offset */ 113886d71829SAsias He ptr = &buf[8]; 113986d71829SAsias He pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 114086d71829SAsias He " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 114186d71829SAsias He 114286d71829SAsias He while (size >= 16) { 114386d71829SAsias He lba = get_unaligned_be64(&ptr[0]); 114486d71829SAsias He range = get_unaligned_be32(&ptr[8]); 114586d71829SAsias He pr_debug("UNMAP: Using lba: %llu and range: %u\n", 114686d71829SAsias He (unsigned long long)lba, range); 114786d71829SAsias He 114886d71829SAsias He if (range > dev->dev_attrib.max_unmap_lba_count) { 114986d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 115086d71829SAsias He goto err; 115186d71829SAsias He } 115286d71829SAsias He 115386d71829SAsias He if (lba + range > dev->transport->get_blocks(dev) + 1) { 115486d71829SAsias He ret = TCM_ADDRESS_OUT_OF_RANGE; 115586d71829SAsias He goto err; 115686d71829SAsias He } 115786d71829SAsias He 115862e46942SChristoph Hellwig ret = ops->execute_unmap(cmd, lba, range); 115986d71829SAsias He if (ret) 116086d71829SAsias He goto err; 116186d71829SAsias He 116286d71829SAsias He ptr += 16; 116386d71829SAsias He size -= 16; 116486d71829SAsias He } 116586d71829SAsias He 116686d71829SAsias He err: 116786d71829SAsias He transport_kunmap_data_sg(cmd); 116886d71829SAsias He if (!ret) 116986d71829SAsias He target_complete_cmd(cmd, GOOD); 117086d71829SAsias He return ret; 117186d71829SAsias He } 117241861fa8SNicholas Bellinger 117366a3d5bcSNicholas Bellinger void 117466a3d5bcSNicholas Bellinger sbc_dif_generate(struct se_cmd *cmd) 117566a3d5bcSNicholas Bellinger { 117666a3d5bcSNicholas Bellinger struct se_device *dev = cmd->se_dev; 117766a3d5bcSNicholas Bellinger struct se_dif_v1_tuple *sdt; 117818213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg, *psg; 117966a3d5bcSNicholas Bellinger sector_t sector = cmd->t_task_lba; 118066a3d5bcSNicholas Bellinger void *daddr, *paddr; 118166a3d5bcSNicholas Bellinger int i, j, offset = 0; 118218213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 118366a3d5bcSNicholas Bellinger 118418213afbSAkinobu Mita for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 118518213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 118666a3d5bcSNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 118766a3d5bcSNicholas Bellinger 118818213afbSAkinobu Mita for (j = 0; j < psg->length; 118918213afbSAkinobu Mita j += sizeof(struct se_dif_v1_tuple)) { 119018213afbSAkinobu Mita __u16 crc; 119118213afbSAkinobu Mita unsigned int avail; 119266a3d5bcSNicholas Bellinger 119318213afbSAkinobu Mita if (offset >= dsg->length) { 119418213afbSAkinobu Mita offset -= dsg->length; 119518213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 119618213afbSAkinobu Mita dsg = sg_next(dsg); 119718213afbSAkinobu Mita if (!dsg) { 119818213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 119918213afbSAkinobu Mita return; 120018213afbSAkinobu Mita } 120118213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 120266a3d5bcSNicholas Bellinger } 120366a3d5bcSNicholas Bellinger 120418213afbSAkinobu Mita sdt = paddr + j; 120518213afbSAkinobu Mita avail = min(block_size, dsg->length - offset); 120618213afbSAkinobu Mita crc = crc_t10dif(daddr + offset, avail); 120718213afbSAkinobu Mita if (avail < block_size) { 120818213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 120918213afbSAkinobu Mita dsg = sg_next(dsg); 121018213afbSAkinobu Mita if (!dsg) { 121118213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 121218213afbSAkinobu Mita return; 121318213afbSAkinobu Mita } 121418213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 121518213afbSAkinobu Mita offset = block_size - avail; 121618213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, offset); 121718213afbSAkinobu Mita } else { 121818213afbSAkinobu Mita offset += block_size; 121918213afbSAkinobu Mita } 122018213afbSAkinobu Mita 122118213afbSAkinobu Mita sdt->guard_tag = cpu_to_be16(crc); 1222823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 122366a3d5bcSNicholas Bellinger sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 122466a3d5bcSNicholas Bellinger sdt->app_tag = 0; 122566a3d5bcSNicholas Bellinger 12266ae50408SNicholas Bellinger pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 122766a3d5bcSNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 12286ae50408SNicholas Bellinger (cmd->data_direction == DMA_TO_DEVICE) ? 12296ae50408SNicholas Bellinger "WRITE" : "READ", (unsigned long long)sector, 12306ae50408SNicholas Bellinger sdt->guard_tag, sdt->app_tag, 12316ae50408SNicholas Bellinger be32_to_cpu(sdt->ref_tag)); 123266a3d5bcSNicholas Bellinger 123366a3d5bcSNicholas Bellinger sector++; 123466a3d5bcSNicholas Bellinger } 123566a3d5bcSNicholas Bellinger 123618213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 123718213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 123866a3d5bcSNicholas Bellinger } 123966a3d5bcSNicholas Bellinger } 124066a3d5bcSNicholas Bellinger 124141861fa8SNicholas Bellinger static sense_reason_t 1242823ddd87SNicholas Bellinger sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt, 124318213afbSAkinobu Mita __u16 crc, sector_t sector, unsigned int ei_lba) 124441861fa8SNicholas Bellinger { 124541861fa8SNicholas Bellinger __be16 csum; 124641861fa8SNicholas Bellinger 1247d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1248d7a463b0SNicholas Bellinger goto check_ref; 1249d7a463b0SNicholas Bellinger 125018213afbSAkinobu Mita csum = cpu_to_be16(crc); 125141861fa8SNicholas Bellinger 125241861fa8SNicholas Bellinger if (sdt->guard_tag != csum) { 125341861fa8SNicholas Bellinger pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 125441861fa8SNicholas Bellinger " csum 0x%04x\n", (unsigned long long)sector, 125541861fa8SNicholas Bellinger be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 125641861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 125741861fa8SNicholas Bellinger } 125841861fa8SNicholas Bellinger 1259d7a463b0SNicholas Bellinger check_ref: 1260d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1261d7a463b0SNicholas Bellinger return 0; 1262d7a463b0SNicholas Bellinger 1263823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 126441861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 126541861fa8SNicholas Bellinger pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 126641861fa8SNicholas Bellinger " sector MSB: 0x%08x\n", (unsigned long long)sector, 126741861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 126841861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 126941861fa8SNicholas Bellinger } 127041861fa8SNicholas Bellinger 1271823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 127241861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != ei_lba) { 127341861fa8SNicholas Bellinger pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 127441861fa8SNicholas Bellinger " ei_lba: 0x%08x\n", (unsigned long long)sector, 127541861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), ei_lba); 127641861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 127741861fa8SNicholas Bellinger } 127841861fa8SNicholas Bellinger 127941861fa8SNicholas Bellinger return 0; 128041861fa8SNicholas Bellinger } 128141861fa8SNicholas Bellinger 1282f75b6faeSSagi Grimberg void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 128341861fa8SNicholas Bellinger struct scatterlist *sg, int sg_off) 128441861fa8SNicholas Bellinger { 128541861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 128641861fa8SNicholas Bellinger struct scatterlist *psg; 128741861fa8SNicholas Bellinger void *paddr, *addr; 128841861fa8SNicholas Bellinger unsigned int i, len, left; 128910762e80SNicholas Bellinger unsigned int offset = sg_off; 129041861fa8SNicholas Bellinger 129138b57f82SNicholas Bellinger if (!sg) 129238b57f82SNicholas Bellinger return; 129338b57f82SNicholas Bellinger 129441861fa8SNicholas Bellinger left = sectors * dev->prot_length; 129541861fa8SNicholas Bellinger 129641861fa8SNicholas Bellinger for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 129716c0ae02SSagi Grimberg unsigned int psg_len, copied = 0; 129841861fa8SNicholas Bellinger 129916c0ae02SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 130016c0ae02SSagi Grimberg psg_len = min(left, psg->length); 130116c0ae02SSagi Grimberg while (psg_len) { 130216c0ae02SSagi Grimberg len = min(psg_len, sg->length - offset); 130316c0ae02SSagi Grimberg addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 130416c0ae02SSagi Grimberg 130516c0ae02SSagi Grimberg if (read) 130616c0ae02SSagi Grimberg memcpy(paddr + copied, addr, len); 130716c0ae02SSagi Grimberg else 130816c0ae02SSagi Grimberg memcpy(addr, paddr + copied, len); 130916c0ae02SSagi Grimberg 131016c0ae02SSagi Grimberg left -= len; 131116c0ae02SSagi Grimberg offset += len; 131216c0ae02SSagi Grimberg copied += len; 131316c0ae02SSagi Grimberg psg_len -= len; 131416c0ae02SSagi Grimberg 131557636388SAkinobu Mita kunmap_atomic(addr - sg->offset - offset); 131657636388SAkinobu Mita 1317d6a65fdcSSagi Grimberg if (offset >= sg->length) { 1318d6a65fdcSSagi Grimberg sg = sg_next(sg); 1319d6a65fdcSSagi Grimberg offset = 0; 1320d6a65fdcSSagi Grimberg } 132141861fa8SNicholas Bellinger } 132257636388SAkinobu Mita kunmap_atomic(paddr - psg->offset); 132316c0ae02SSagi Grimberg } 132441861fa8SNicholas Bellinger } 1325f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_copy_prot); 132641861fa8SNicholas Bellinger 132741861fa8SNicholas Bellinger sense_reason_t 1328f75b6faeSSagi Grimberg sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1329414e4627SSagi Grimberg unsigned int ei_lba, struct scatterlist *psg, int psg_off) 133041861fa8SNicholas Bellinger { 133141861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 133241861fa8SNicholas Bellinger struct se_dif_v1_tuple *sdt; 133318213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg; 133441861fa8SNicholas Bellinger sector_t sector = start; 133541861fa8SNicholas Bellinger void *daddr, *paddr; 133618213afbSAkinobu Mita int i; 133741861fa8SNicholas Bellinger sense_reason_t rc; 133818213afbSAkinobu Mita int dsg_off = 0; 133918213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 134041861fa8SNicholas Bellinger 134118213afbSAkinobu Mita for (; psg && sector < start + sectors; psg = sg_next(psg)) { 134218213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 134341861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 134441861fa8SNicholas Bellinger 134518213afbSAkinobu Mita for (i = psg_off; i < psg->length && 134618213afbSAkinobu Mita sector < start + sectors; 134718213afbSAkinobu Mita i += sizeof(struct se_dif_v1_tuple)) { 134818213afbSAkinobu Mita __u16 crc; 134918213afbSAkinobu Mita unsigned int avail; 135041861fa8SNicholas Bellinger 135118213afbSAkinobu Mita if (dsg_off >= dsg->length) { 135218213afbSAkinobu Mita dsg_off -= dsg->length; 135318213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 135418213afbSAkinobu Mita dsg = sg_next(dsg); 135518213afbSAkinobu Mita if (!dsg) { 1356414e4627SSagi Grimberg kunmap_atomic(paddr - psg->offset); 135718213afbSAkinobu Mita return 0; 135818213afbSAkinobu Mita } 135918213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 136041861fa8SNicholas Bellinger } 136141861fa8SNicholas Bellinger 136218213afbSAkinobu Mita sdt = paddr + i; 136341861fa8SNicholas Bellinger 136441861fa8SNicholas Bellinger pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 136541861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 136641861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 136741861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 136841861fa8SNicholas Bellinger 136941861fa8SNicholas Bellinger if (sdt->app_tag == cpu_to_be16(0xffff)) { 137018213afbSAkinobu Mita dsg_off += block_size; 137118213afbSAkinobu Mita goto next; 137241861fa8SNicholas Bellinger } 137341861fa8SNicholas Bellinger 137418213afbSAkinobu Mita avail = min(block_size, dsg->length - dsg_off); 137518213afbSAkinobu Mita crc = crc_t10dif(daddr + dsg_off, avail); 137618213afbSAkinobu Mita if (avail < block_size) { 1377414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 137818213afbSAkinobu Mita dsg = sg_next(dsg); 137918213afbSAkinobu Mita if (!dsg) { 138018213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 138118213afbSAkinobu Mita return 0; 138218213afbSAkinobu Mita } 138318213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 138418213afbSAkinobu Mita dsg_off = block_size - avail; 138518213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, dsg_off); 138618213afbSAkinobu Mita } else { 138718213afbSAkinobu Mita dsg_off += block_size; 138818213afbSAkinobu Mita } 138918213afbSAkinobu Mita 139018213afbSAkinobu Mita rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 139118213afbSAkinobu Mita if (rc) { 139218213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 139318213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 139476736db3SSagi Grimberg cmd->bad_sector = sector; 139541861fa8SNicholas Bellinger return rc; 139641861fa8SNicholas Bellinger } 139718213afbSAkinobu Mita next: 139841861fa8SNicholas Bellinger sector++; 139941861fa8SNicholas Bellinger ei_lba++; 140041861fa8SNicholas Bellinger } 140141861fa8SNicholas Bellinger 140218213afbSAkinobu Mita psg_off = 0; 1403414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 140418213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 140541861fa8SNicholas Bellinger } 140641861fa8SNicholas Bellinger 140741861fa8SNicholas Bellinger return 0; 140841861fa8SNicholas Bellinger } 1409f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_verify); 1410