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> 28ba929992SBart Van Assche #include <scsi/scsi_proto.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 15745182ed5SBrian Bunker static sense_reason_t 15845182ed5SBrian Bunker sbc_emulate_startstop(struct se_cmd *cmd) 15945182ed5SBrian Bunker { 16045182ed5SBrian Bunker unsigned char *cdb = cmd->t_task_cdb; 16145182ed5SBrian Bunker 16245182ed5SBrian Bunker /* 16345182ed5SBrian Bunker * See sbc3r36 section 5.25 16445182ed5SBrian Bunker * Immediate bit should be set since there is nothing to complete 16545182ed5SBrian Bunker * POWER CONDITION MODIFIER 0h 16645182ed5SBrian Bunker */ 16745182ed5SBrian Bunker if (!(cdb[1] & 1) || cdb[2] || cdb[3]) 16845182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 16945182ed5SBrian Bunker 17045182ed5SBrian Bunker /* 17145182ed5SBrian Bunker * See sbc3r36 section 5.25 17245182ed5SBrian Bunker * POWER CONDITION 0h START_VALID - process START and LOEJ 17345182ed5SBrian Bunker */ 17445182ed5SBrian Bunker if (cdb[4] >> 4 & 0xf) 17545182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 17645182ed5SBrian Bunker 17745182ed5SBrian Bunker /* 17845182ed5SBrian Bunker * See sbc3r36 section 5.25 17945182ed5SBrian Bunker * LOEJ 0h - nothing to load or unload 18045182ed5SBrian Bunker * START 1h - we are ready 18145182ed5SBrian Bunker */ 18245182ed5SBrian Bunker if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) 18345182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 18445182ed5SBrian Bunker 18545182ed5SBrian Bunker target_complete_cmd(cmd, SAM_STAT_GOOD); 18645182ed5SBrian Bunker return 0; 18745182ed5SBrian Bunker } 18845182ed5SBrian Bunker 189972b29c8SRoland Dreier sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 1901fd032eeSChristoph Hellwig { 1911fd032eeSChristoph Hellwig u32 num_blocks; 1921fd032eeSChristoph Hellwig 1931fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1941fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1951fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1961fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1971fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1981fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1991fd032eeSChristoph Hellwig 2001fd032eeSChristoph Hellwig /* 2011fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 2021fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 2031fd032eeSChristoph Hellwig */ 2046f974e8cSChristoph Hellwig if (num_blocks) 2056f974e8cSChristoph Hellwig return num_blocks; 2061fd032eeSChristoph Hellwig 2076f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 2086f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 2091fd032eeSChristoph Hellwig } 210972b29c8SRoland Dreier EXPORT_SYMBOL(sbc_get_write_same_sectors); 2111fd032eeSChristoph Hellwig 212de103c93SChristoph Hellwig static sense_reason_t 213b753d643SChristoph Hellwig sbc_execute_write_same_unmap(struct se_cmd *cmd) 214b753d643SChristoph Hellwig { 215b753d643SChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 216b753d643SChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 217b753d643SChristoph Hellwig sense_reason_t ret; 218b753d643SChristoph Hellwig 219b753d643SChristoph Hellwig if (nolb) { 220b753d643SChristoph Hellwig ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); 221b753d643SChristoph Hellwig if (ret) 222b753d643SChristoph Hellwig return ret; 223b753d643SChristoph Hellwig } 224b753d643SChristoph Hellwig 225b753d643SChristoph Hellwig target_complete_cmd(cmd, GOOD); 226b753d643SChristoph Hellwig return 0; 227b753d643SChristoph Hellwig } 228b753d643SChristoph Hellwig 229b753d643SChristoph Hellwig static sense_reason_t 2301920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 2311a1ff38cSBernhard Kohl { 2321a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 2331a1ff38cSBernhard Kohl return 0; 2341a1ff38cSBernhard Kohl } 2351a1ff38cSBernhard Kohl 236d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 237d6e0175cSChristoph Hellwig { 2380fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 239d6e0175cSChristoph Hellwig } 240d6e0175cSChristoph Hellwig 241d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 242d6e0175cSChristoph Hellwig { 243d6e0175cSChristoph Hellwig /* 244d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 245d6e0175cSChristoph Hellwig * 246d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 247d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 248d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 249d6e0175cSChristoph Hellwig * written. 250d6e0175cSChristoph Hellwig */ 251d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 252d6e0175cSChristoph Hellwig } 253d6e0175cSChristoph Hellwig 254d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 255d6e0175cSChristoph Hellwig { 256d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 257d6e0175cSChristoph Hellwig } 258d6e0175cSChristoph Hellwig 259d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 260d6e0175cSChristoph Hellwig { 261d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 262d6e0175cSChristoph Hellwig } 263d6e0175cSChristoph Hellwig 264d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 265d6e0175cSChristoph Hellwig { 266d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 267d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 268d6e0175cSChristoph Hellwig } 269d6e0175cSChristoph Hellwig 270d6e0175cSChristoph Hellwig /* 271d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 272d6e0175cSChristoph Hellwig */ 273d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 274d6e0175cSChristoph Hellwig { 275d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 276d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 277d6e0175cSChristoph Hellwig 278d6e0175cSChristoph Hellwig } 279d6e0175cSChristoph Hellwig 280d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 281d6e0175cSChristoph Hellwig { 282d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 283d6e0175cSChristoph Hellwig } 284d6e0175cSChristoph Hellwig 285d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 286d6e0175cSChristoph Hellwig { 287d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 288d6e0175cSChristoph Hellwig } 289d6e0175cSChristoph Hellwig 290d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 291d6e0175cSChristoph Hellwig { 292d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 293d6e0175cSChristoph Hellwig 294d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 295d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 296d6e0175cSChristoph Hellwig 297d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 298d6e0175cSChristoph Hellwig } 299d6e0175cSChristoph Hellwig 300d6e0175cSChristoph Hellwig /* 301d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 302d6e0175cSChristoph Hellwig */ 303d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 304d6e0175cSChristoph Hellwig { 305d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 306d6e0175cSChristoph Hellwig 307d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 308d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 309d6e0175cSChristoph Hellwig 310d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 311d6e0175cSChristoph Hellwig } 312d6e0175cSChristoph Hellwig 313cd063befSNicholas Bellinger static sense_reason_t 314cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 315d6e0175cSChristoph Hellwig { 3168e575c50SNicholas Bellinger struct se_device *dev = cmd->se_dev; 3178e575c50SNicholas Bellinger sector_t end_lba = dev->transport->get_blocks(dev) + 1; 318972b29c8SRoland Dreier unsigned int sectors = sbc_get_write_same_sectors(cmd); 319afd73f1bSNicholas Bellinger sense_reason_t ret; 320773cbaf7SNicholas Bellinger 321d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 322d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 323d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 324d6e0175cSChristoph Hellwig " Emulation\n"); 325cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 326d6e0175cSChristoph Hellwig } 327773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 328773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 329773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 330773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 331773cbaf7SNicholas Bellinger } 3328e575c50SNicholas Bellinger /* 3338e575c50SNicholas Bellinger * Sanity check for LBA wrap and request past end of device. 3348e575c50SNicholas Bellinger */ 3358e575c50SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 3368e575c50SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 3378e575c50SNicholas Bellinger pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 3388e575c50SNicholas Bellinger (unsigned long long)end_lba, cmd->t_task_lba, sectors); 3398e575c50SNicholas Bellinger return TCM_ADDRESS_OUT_OF_RANGE; 3408e575c50SNicholas Bellinger } 3418e575c50SNicholas Bellinger 3425cb770bfSRoland Dreier /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 3435cb770bfSRoland Dreier if (flags[0] & 0x10) { 3445cb770bfSRoland Dreier pr_warn("WRITE SAME with ANCHOR not supported\n"); 3455cb770bfSRoland Dreier return TCM_INVALID_CDB_FIELD; 3465cb770bfSRoland Dreier } 347d6e0175cSChristoph Hellwig /* 348cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 349cd063befSNicholas Bellinger * translated into block discard requests within backend code. 350d6e0175cSChristoph Hellwig */ 351cd063befSNicholas Bellinger if (flags[0] & 0x08) { 352b753d643SChristoph Hellwig if (!ops->execute_unmap) 353cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 354d6e0175cSChristoph Hellwig 355d0a91295SNicholas Bellinger if (!dev->dev_attrib.emulate_tpws) { 356d0a91295SNicholas Bellinger pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 357d0a91295SNicholas Bellinger " has emulate_tpws disabled\n"); 358d0a91295SNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 359d0a91295SNicholas Bellinger } 360b753d643SChristoph Hellwig cmd->execute_cmd = sbc_execute_write_same_unmap; 361cd063befSNicholas Bellinger return 0; 362cd063befSNicholas Bellinger } 363cd063befSNicholas Bellinger if (!ops->execute_write_same) 364cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 365cd063befSNicholas Bellinger 366afd73f1bSNicholas Bellinger ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 367afd73f1bSNicholas Bellinger if (ret) 368afd73f1bSNicholas Bellinger return ret; 369afd73f1bSNicholas Bellinger 370cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 371d6e0175cSChristoph Hellwig return 0; 372d6e0175cSChristoph Hellwig } 373d6e0175cSChristoph Hellwig 374c8e63985SNicholas Bellinger static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) 375d6e0175cSChristoph Hellwig { 376d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 377d6e0175cSChristoph Hellwig struct scatterlist *sg; 378d6e0175cSChristoph Hellwig unsigned int offset; 379a6b0133cSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 380a6b0133cSNicholas Bellinger int i, count; 381d6e0175cSChristoph Hellwig /* 382d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 383d6e0175cSChristoph Hellwig * 384d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 385d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 386d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 387d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 388d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 389d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 390d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 391d6e0175cSChristoph Hellwig */ 392d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 393d6e0175cSChristoph Hellwig if (!buf) { 394d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 395a6b0133cSNicholas Bellinger return TCM_OUT_OF_RESOURCES; 396d6e0175cSChristoph Hellwig } 397d6e0175cSChristoph Hellwig /* 398d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 399d6e0175cSChristoph Hellwig * into the locally allocated *buf 400d6e0175cSChristoph Hellwig */ 401d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 402d6e0175cSChristoph Hellwig cmd->t_data_nents, 403d6e0175cSChristoph Hellwig buf, 404d6e0175cSChristoph Hellwig cmd->data_length); 405d6e0175cSChristoph Hellwig 406d6e0175cSChristoph Hellwig /* 407d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 408d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 409d6e0175cSChristoph Hellwig */ 410d6e0175cSChristoph Hellwig 411d6e0175cSChristoph Hellwig offset = 0; 412d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 413d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 414a6b0133cSNicholas Bellinger if (!addr) { 415a6b0133cSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 416d6e0175cSChristoph Hellwig goto out; 417a6b0133cSNicholas Bellinger } 418d6e0175cSChristoph Hellwig 419d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 420d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 421d6e0175cSChristoph Hellwig 422d6e0175cSChristoph Hellwig offset += sg->length; 423d6e0175cSChristoph Hellwig kunmap_atomic(addr); 424d6e0175cSChristoph Hellwig } 425d6e0175cSChristoph Hellwig 426d6e0175cSChristoph Hellwig out: 427d6e0175cSChristoph Hellwig kfree(buf); 428a6b0133cSNicholas Bellinger return ret; 429d6e0175cSChristoph Hellwig } 430d6e0175cSChristoph Hellwig 431a82a9538SNicholas Bellinger static sense_reason_t 432a82a9538SNicholas Bellinger sbc_execute_rw(struct se_cmd *cmd) 433a82a9538SNicholas Bellinger { 4347a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 4357a971b1bSChristoph Hellwig 4367a971b1bSChristoph Hellwig return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 437a82a9538SNicholas Bellinger cmd->data_direction); 438a82a9538SNicholas Bellinger } 439a82a9538SNicholas Bellinger 440c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) 44168ff9b9bSNicholas Bellinger { 44268ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 44368ff9b9bSNicholas Bellinger 444d8855c15SNicholas Bellinger /* 445d8855c15SNicholas Bellinger * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 446d8855c15SNicholas Bellinger * within target_complete_ok_work() if the command was successfully 447d8855c15SNicholas Bellinger * sent to the backend driver. 448d8855c15SNicholas Bellinger */ 449d8855c15SNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 450d8855c15SNicholas Bellinger if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 45168ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 452d8855c15SNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 453d8855c15SNicholas Bellinger 45468ff9b9bSNicholas Bellinger /* 45568ff9b9bSNicholas Bellinger * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 45668ff9b9bSNicholas Bellinger * before the original READ I/O submission. 45768ff9b9bSNicholas Bellinger */ 45868ff9b9bSNicholas Bellinger up(&dev->caw_sem); 45968ff9b9bSNicholas Bellinger 46068ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 46168ff9b9bSNicholas Bellinger } 46268ff9b9bSNicholas Bellinger 463c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) 46468ff9b9bSNicholas Bellinger { 46568ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 46668ff9b9bSNicholas Bellinger struct scatterlist *write_sg = NULL, *sg; 467db60df88SNicholas Bellinger unsigned char *buf = NULL, *addr; 46868ff9b9bSNicholas Bellinger struct sg_mapping_iter m; 46968ff9b9bSNicholas Bellinger unsigned int offset = 0, len; 47068ff9b9bSNicholas Bellinger unsigned int nlbas = cmd->t_task_nolb; 47168ff9b9bSNicholas Bellinger unsigned int block_size = dev->dev_attrib.block_size; 47268ff9b9bSNicholas Bellinger unsigned int compare_len = (nlbas * block_size); 47368ff9b9bSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 47468ff9b9bSNicholas Bellinger int rc, i; 47568ff9b9bSNicholas Bellinger 476cf6d1f09SNicholas Bellinger /* 477cf6d1f09SNicholas Bellinger * Handle early failure in transport_generic_request_failure(), 478c8e63985SNicholas Bellinger * which will not have taken ->caw_sem yet.. 479cf6d1f09SNicholas Bellinger */ 480c8e63985SNicholas Bellinger if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 481cf6d1f09SNicholas Bellinger return TCM_NO_SENSE; 482db60df88SNicholas Bellinger /* 483c8e63985SNicholas Bellinger * Handle special case for zero-length COMPARE_AND_WRITE 484c8e63985SNicholas Bellinger */ 485c8e63985SNicholas Bellinger if (!cmd->data_length) 486c8e63985SNicholas Bellinger goto out; 487c8e63985SNicholas Bellinger /* 488db60df88SNicholas Bellinger * Immediately exit + release dev->caw_sem if command has already 489db60df88SNicholas Bellinger * been failed with a non-zero SCSI status. 490db60df88SNicholas Bellinger */ 491db60df88SNicholas Bellinger if (cmd->scsi_status) { 492db60df88SNicholas Bellinger pr_err("compare_and_write_callback: non zero scsi_status:" 493db60df88SNicholas Bellinger " 0x%02x\n", cmd->scsi_status); 494db60df88SNicholas Bellinger goto out; 495db60df88SNicholas Bellinger } 496cf6d1f09SNicholas Bellinger 49768ff9b9bSNicholas Bellinger buf = kzalloc(cmd->data_length, GFP_KERNEL); 49868ff9b9bSNicholas Bellinger if (!buf) { 49968ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write buf\n"); 500a2890087SNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 501a2890087SNicholas Bellinger goto out; 50268ff9b9bSNicholas Bellinger } 50368ff9b9bSNicholas Bellinger 504a1e1774cSMartin Svec write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 50568ff9b9bSNicholas Bellinger GFP_KERNEL); 50668ff9b9bSNicholas Bellinger if (!write_sg) { 50768ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write sg\n"); 50868ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 50968ff9b9bSNicholas Bellinger goto out; 51068ff9b9bSNicholas Bellinger } 511a1e1774cSMartin Svec sg_init_table(write_sg, cmd->t_data_nents); 51268ff9b9bSNicholas Bellinger /* 51368ff9b9bSNicholas Bellinger * Setup verify and write data payloads from total NumberLBAs. 51468ff9b9bSNicholas Bellinger */ 51568ff9b9bSNicholas Bellinger rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 51668ff9b9bSNicholas Bellinger cmd->data_length); 51768ff9b9bSNicholas Bellinger if (!rc) { 51868ff9b9bSNicholas Bellinger pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 51968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 52068ff9b9bSNicholas Bellinger goto out; 52168ff9b9bSNicholas Bellinger } 52268ff9b9bSNicholas Bellinger /* 52368ff9b9bSNicholas Bellinger * Compare against SCSI READ payload against verify payload 52468ff9b9bSNicholas Bellinger */ 52568ff9b9bSNicholas Bellinger for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 52668ff9b9bSNicholas Bellinger addr = (unsigned char *)kmap_atomic(sg_page(sg)); 52768ff9b9bSNicholas Bellinger if (!addr) { 52868ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 52968ff9b9bSNicholas Bellinger goto out; 53068ff9b9bSNicholas Bellinger } 53168ff9b9bSNicholas Bellinger 53268ff9b9bSNicholas Bellinger len = min(sg->length, compare_len); 53368ff9b9bSNicholas Bellinger 53468ff9b9bSNicholas Bellinger if (memcmp(addr, buf + offset, len)) { 53568ff9b9bSNicholas Bellinger pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 53668ff9b9bSNicholas Bellinger addr, buf + offset); 53768ff9b9bSNicholas Bellinger kunmap_atomic(addr); 53868ff9b9bSNicholas Bellinger goto miscompare; 53968ff9b9bSNicholas Bellinger } 54068ff9b9bSNicholas Bellinger kunmap_atomic(addr); 54168ff9b9bSNicholas Bellinger 54268ff9b9bSNicholas Bellinger offset += len; 54368ff9b9bSNicholas Bellinger compare_len -= len; 54468ff9b9bSNicholas Bellinger if (!compare_len) 54568ff9b9bSNicholas Bellinger break; 54668ff9b9bSNicholas Bellinger } 54768ff9b9bSNicholas Bellinger 54868ff9b9bSNicholas Bellinger i = 0; 54968ff9b9bSNicholas Bellinger len = cmd->t_task_nolb * block_size; 55068ff9b9bSNicholas Bellinger sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 55168ff9b9bSNicholas Bellinger /* 55268ff9b9bSNicholas Bellinger * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 55368ff9b9bSNicholas Bellinger */ 55468ff9b9bSNicholas Bellinger while (len) { 55568ff9b9bSNicholas Bellinger sg_miter_next(&m); 55668ff9b9bSNicholas Bellinger 55768ff9b9bSNicholas Bellinger if (block_size < PAGE_SIZE) { 55868ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 55968ff9b9bSNicholas Bellinger block_size); 56068ff9b9bSNicholas Bellinger } else { 56168ff9b9bSNicholas Bellinger sg_miter_next(&m); 56268ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 56368ff9b9bSNicholas Bellinger 0); 56468ff9b9bSNicholas Bellinger } 56568ff9b9bSNicholas Bellinger len -= block_size; 56668ff9b9bSNicholas Bellinger i++; 56768ff9b9bSNicholas Bellinger } 56868ff9b9bSNicholas Bellinger sg_miter_stop(&m); 56968ff9b9bSNicholas Bellinger /* 57068ff9b9bSNicholas Bellinger * Save the original SGL + nents values before updating to new 57168ff9b9bSNicholas Bellinger * assignments, to be released in transport_free_pages() -> 57268ff9b9bSNicholas Bellinger * transport_reset_sgl_orig() 57368ff9b9bSNicholas Bellinger */ 57468ff9b9bSNicholas Bellinger cmd->t_data_sg_orig = cmd->t_data_sg; 57568ff9b9bSNicholas Bellinger cmd->t_data_sg = write_sg; 57668ff9b9bSNicholas Bellinger cmd->t_data_nents_orig = cmd->t_data_nents; 57768ff9b9bSNicholas Bellinger cmd->t_data_nents = 1; 57868ff9b9bSNicholas Bellinger 57968d81f40SChristoph Hellwig cmd->sam_task_attr = TCM_HEAD_TAG; 58068ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_post; 58168ff9b9bSNicholas Bellinger /* 58268ff9b9bSNicholas Bellinger * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 58368ff9b9bSNicholas Bellinger * for submitting the adjusted SGL to write instance user-data. 58468ff9b9bSNicholas Bellinger */ 58568ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 58668ff9b9bSNicholas Bellinger 58768ff9b9bSNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 58868ff9b9bSNicholas Bellinger cmd->t_state = TRANSPORT_PROCESSING; 58968ff9b9bSNicholas Bellinger cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 59068ff9b9bSNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 59168ff9b9bSNicholas Bellinger 59268ff9b9bSNicholas Bellinger __target_execute_cmd(cmd); 59368ff9b9bSNicholas Bellinger 59468ff9b9bSNicholas Bellinger kfree(buf); 59568ff9b9bSNicholas Bellinger return ret; 59668ff9b9bSNicholas Bellinger 59768ff9b9bSNicholas Bellinger miscompare: 59868ff9b9bSNicholas Bellinger pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 59968ff9b9bSNicholas Bellinger dev->transport->name); 60068ff9b9bSNicholas Bellinger ret = TCM_MISCOMPARE_VERIFY; 60168ff9b9bSNicholas Bellinger out: 60268ff9b9bSNicholas Bellinger /* 60368ff9b9bSNicholas Bellinger * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 60468ff9b9bSNicholas Bellinger * sbc_compare_and_write() before the original READ I/O submission. 60568ff9b9bSNicholas Bellinger */ 60668ff9b9bSNicholas Bellinger up(&dev->caw_sem); 60768ff9b9bSNicholas Bellinger kfree(write_sg); 60868ff9b9bSNicholas Bellinger kfree(buf); 60968ff9b9bSNicholas Bellinger return ret; 61068ff9b9bSNicholas Bellinger } 61168ff9b9bSNicholas Bellinger 61268ff9b9bSNicholas Bellinger static sense_reason_t 61368ff9b9bSNicholas Bellinger sbc_compare_and_write(struct se_cmd *cmd) 61468ff9b9bSNicholas Bellinger { 6157a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 61668ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 61768ff9b9bSNicholas Bellinger sense_reason_t ret; 61868ff9b9bSNicholas Bellinger int rc; 61968ff9b9bSNicholas Bellinger /* 62068ff9b9bSNicholas Bellinger * Submit the READ first for COMPARE_AND_WRITE to perform the 62168ff9b9bSNicholas Bellinger * comparision using SGLs at cmd->t_bidi_data_sg.. 62268ff9b9bSNicholas Bellinger */ 62368ff9b9bSNicholas Bellinger rc = down_interruptible(&dev->caw_sem); 624ee7619f2SNicholas Bellinger if (rc != 0) { 62568ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 62668ff9b9bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 62768ff9b9bSNicholas Bellinger } 628b7191253SNicholas Bellinger /* 629b7191253SNicholas Bellinger * Reset cmd->data_length to individual block_size in order to not 630b7191253SNicholas Bellinger * confuse backend drivers that depend on this value matching the 631b7191253SNicholas Bellinger * size of the I/O being submitted. 632b7191253SNicholas Bellinger */ 633b7191253SNicholas Bellinger cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 63468ff9b9bSNicholas Bellinger 6357a971b1bSChristoph Hellwig ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 63668ff9b9bSNicholas Bellinger DMA_FROM_DEVICE); 63768ff9b9bSNicholas Bellinger if (ret) { 63868ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 63968ff9b9bSNicholas Bellinger up(&dev->caw_sem); 64068ff9b9bSNicholas Bellinger return ret; 64168ff9b9bSNicholas Bellinger } 64268ff9b9bSNicholas Bellinger /* 64368ff9b9bSNicholas Bellinger * Unlock of dev->caw_sem to occur in compare_and_write_callback() 64468ff9b9bSNicholas Bellinger * upon MISCOMPARE, or in compare_and_write_done() upon completion 64568ff9b9bSNicholas Bellinger * of WRITE instance user-data. 64668ff9b9bSNicholas Bellinger */ 64768ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 64868ff9b9bSNicholas Bellinger } 64968ff9b9bSNicholas Bellinger 65019f9361aSSagi Grimberg static int 65138b57f82SNicholas Bellinger sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 65219f9361aSSagi Grimberg bool is_write, struct se_cmd *cmd) 65319f9361aSSagi Grimberg { 65419f9361aSSagi Grimberg if (is_write) { 65538b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 65638b57f82SNicholas Bellinger protect ? TARGET_PROT_DOUT_PASS : 65719f9361aSSagi Grimberg TARGET_PROT_DOUT_INSERT; 65819f9361aSSagi Grimberg switch (protect) { 65919f9361aSSagi Grimberg case 0x0: 66019f9361aSSagi Grimberg case 0x3: 66119f9361aSSagi Grimberg cmd->prot_checks = 0; 66219f9361aSSagi Grimberg break; 66319f9361aSSagi Grimberg case 0x1: 66419f9361aSSagi Grimberg case 0x5: 66519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 66619f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 66719f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 66819f9361aSSagi Grimberg break; 66919f9361aSSagi Grimberg case 0x2: 67019f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 67119f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 67219f9361aSSagi Grimberg break; 67319f9361aSSagi Grimberg case 0x4: 67419f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 67519f9361aSSagi Grimberg break; 67619f9361aSSagi Grimberg default: 67719f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 67819f9361aSSagi Grimberg return -EINVAL; 67919f9361aSSagi Grimberg } 68019f9361aSSagi Grimberg } else { 68138b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 68238b57f82SNicholas Bellinger protect ? TARGET_PROT_DIN_PASS : 68319f9361aSSagi Grimberg TARGET_PROT_DIN_STRIP; 68419f9361aSSagi Grimberg switch (protect) { 68519f9361aSSagi Grimberg case 0x0: 68619f9361aSSagi Grimberg case 0x1: 68719f9361aSSagi Grimberg case 0x5: 68819f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 68919f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 69019f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 69119f9361aSSagi Grimberg break; 69219f9361aSSagi Grimberg case 0x2: 69319f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 69419f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 69519f9361aSSagi Grimberg break; 69619f9361aSSagi Grimberg case 0x3: 69719f9361aSSagi Grimberg cmd->prot_checks = 0; 69819f9361aSSagi Grimberg break; 69919f9361aSSagi Grimberg case 0x4: 70019f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 70119f9361aSSagi Grimberg break; 70219f9361aSSagi Grimberg default: 70319f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 70419f9361aSSagi Grimberg return -EINVAL; 70519f9361aSSagi Grimberg } 70619f9361aSSagi Grimberg } 70719f9361aSSagi Grimberg 70819f9361aSSagi Grimberg return 0; 70919f9361aSSagi Grimberg } 71019f9361aSSagi Grimberg 711f7b7c06fSNicholas Bellinger static sense_reason_t 712499bf77bSNicholas Bellinger sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 71319f9361aSSagi Grimberg u32 sectors, bool is_write) 714499bf77bSNicholas Bellinger { 71519f9361aSSagi Grimberg u8 protect = cdb[1] >> 5; 71638b57f82SNicholas Bellinger int sp_ops = cmd->se_sess->sup_prot_ops; 71738b57f82SNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 71838b57f82SNicholas Bellinger bool fabric_prot = false; 71919f9361aSSagi Grimberg 720f7b7c06fSNicholas Bellinger if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 72138b57f82SNicholas Bellinger if (unlikely(protect && 72238b57f82SNicholas Bellinger !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 72338b57f82SNicholas Bellinger pr_err("CDB contains protect bit, but device + fabric does" 72438b57f82SNicholas Bellinger " not advertise PROTECT=1 feature bit\n"); 725f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 726f7b7c06fSNicholas Bellinger } 727f7b7c06fSNicholas Bellinger if (cmd->prot_pto) 728f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 729f7b7c06fSNicholas Bellinger } 730499bf77bSNicholas Bellinger 731499bf77bSNicholas Bellinger switch (dev->dev_attrib.pi_prot_type) { 732499bf77bSNicholas Bellinger case TARGET_DIF_TYPE3_PROT: 733499bf77bSNicholas Bellinger cmd->reftag_seed = 0xffffffff; 734499bf77bSNicholas Bellinger break; 735499bf77bSNicholas Bellinger case TARGET_DIF_TYPE2_PROT: 73619f9361aSSagi Grimberg if (protect) 737f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 738499bf77bSNicholas Bellinger 739499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 740499bf77bSNicholas Bellinger break; 741499bf77bSNicholas Bellinger case TARGET_DIF_TYPE1_PROT: 742499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 743499bf77bSNicholas Bellinger break; 744499bf77bSNicholas Bellinger case TARGET_DIF_TYPE0_PROT: 74538b57f82SNicholas Bellinger /* 74638b57f82SNicholas Bellinger * See if the fabric supports T10-PI, and the session has been 74738b57f82SNicholas Bellinger * configured to allow export PROTECT=1 feature bit with backend 74838b57f82SNicholas Bellinger * devices that don't support T10-PI. 74938b57f82SNicholas Bellinger */ 75038b57f82SNicholas Bellinger fabric_prot = is_write ? 75138b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 75238b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 75338b57f82SNicholas Bellinger 75438b57f82SNicholas Bellinger if (fabric_prot && cmd->se_sess->sess_prot_type) { 75538b57f82SNicholas Bellinger pi_prot_type = cmd->se_sess->sess_prot_type; 75638b57f82SNicholas Bellinger break; 75738b57f82SNicholas Bellinger } 758cceca4a6SNicholas Bellinger if (!protect) 759f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 76038b57f82SNicholas Bellinger /* Fallthrough */ 761499bf77bSNicholas Bellinger default: 762cceca4a6SNicholas Bellinger pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 763cceca4a6SNicholas Bellinger "PROTECT: 0x%02x\n", cdb[0], protect); 764cceca4a6SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 765499bf77bSNicholas Bellinger } 766499bf77bSNicholas Bellinger 76738b57f82SNicholas Bellinger if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 768f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 76919f9361aSSagi Grimberg 77038b57f82SNicholas Bellinger cmd->prot_type = pi_prot_type; 771499bf77bSNicholas Bellinger cmd->prot_length = dev->prot_length * sectors; 772e2a4f55cSSagi Grimberg 773e2a4f55cSSagi Grimberg /** 774e2a4f55cSSagi Grimberg * In case protection information exists over the wire 775e2a4f55cSSagi Grimberg * we modify command data length to describe pure data. 776e2a4f55cSSagi Grimberg * The actual transfer length is data length + protection 777e2a4f55cSSagi Grimberg * length 778e2a4f55cSSagi Grimberg **/ 779e2a4f55cSSagi Grimberg if (protect) 780e2a4f55cSSagi Grimberg cmd->data_length = sectors * dev->dev_attrib.block_size; 781e2a4f55cSSagi Grimberg 782e2a4f55cSSagi Grimberg pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 783e2a4f55cSSagi Grimberg "prot_op=%d prot_checks=%d\n", 784e2a4f55cSSagi Grimberg __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 78503abad9eSSagi Grimberg cmd->prot_op, cmd->prot_checks); 786499bf77bSNicholas Bellinger 787f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 788499bf77bSNicholas Bellinger } 789499bf77bSNicholas Bellinger 790fde9f50fSNicholas Bellinger static int 791fde9f50fSNicholas Bellinger sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 792fde9f50fSNicholas Bellinger { 793fde9f50fSNicholas Bellinger if (cdb[1] & 0x10) { 794814e5b45SChristoph Hellwig /* see explanation in spc_emulate_modesense */ 795814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 796fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with DPO bit set, but device" 797fde9f50fSNicholas Bellinger " does not advertise support for DPO\n", cdb[0]); 798fde9f50fSNicholas Bellinger return -EINVAL; 799fde9f50fSNicholas Bellinger } 800fde9f50fSNicholas Bellinger } 801fde9f50fSNicholas Bellinger if (cdb[1] & 0x8) { 802814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 803fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with FUA bit set, but device" 804fde9f50fSNicholas Bellinger " does not advertise support for FUA write\n", 805fde9f50fSNicholas Bellinger cdb[0]); 806fde9f50fSNicholas Bellinger return -EINVAL; 807fde9f50fSNicholas Bellinger } 808fde9f50fSNicholas Bellinger cmd->se_cmd_flags |= SCF_FUA; 809fde9f50fSNicholas Bellinger } 810fde9f50fSNicholas Bellinger return 0; 811d6e0175cSChristoph Hellwig } 812d6e0175cSChristoph Hellwig 813de103c93SChristoph Hellwig sense_reason_t 814de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 815d6e0175cSChristoph Hellwig { 816d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 817d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 8181fd032eeSChristoph Hellwig unsigned int size; 819d6e0175cSChristoph Hellwig u32 sectors = 0; 820de103c93SChristoph Hellwig sense_reason_t ret; 821d6e0175cSChristoph Hellwig 8227a971b1bSChristoph Hellwig cmd->protocol_data = ops; 8237a971b1bSChristoph Hellwig 824d6e0175cSChristoph Hellwig switch (cdb[0]) { 825d6e0175cSChristoph Hellwig case READ_6: 826d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 827d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 828d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 829a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 830d6e0175cSChristoph Hellwig break; 831d6e0175cSChristoph Hellwig case READ_10: 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; 837fde9f50fSNicholas Bellinger 838f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 839f7b7c06fSNicholas Bellinger if (ret) 840f7b7c06fSNicholas Bellinger return ret; 841499bf77bSNicholas Bellinger 842d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 843a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 844d6e0175cSChristoph Hellwig break; 845d6e0175cSChristoph Hellwig case READ_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; 851fde9f50fSNicholas Bellinger 852f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 853f7b7c06fSNicholas Bellinger if (ret) 854f7b7c06fSNicholas Bellinger return ret; 855499bf77bSNicholas Bellinger 856d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 857a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 858d6e0175cSChristoph Hellwig break; 859d6e0175cSChristoph Hellwig case READ_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; 865fde9f50fSNicholas Bellinger 866f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 867f7b7c06fSNicholas Bellinger if (ret) 868f7b7c06fSNicholas Bellinger return ret; 869499bf77bSNicholas Bellinger 870d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 871a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 872d6e0175cSChristoph Hellwig break; 873d6e0175cSChristoph Hellwig case WRITE_6: 874d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 875d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 876d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 877a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 878d6e0175cSChristoph Hellwig break; 879d6e0175cSChristoph Hellwig case WRITE_10: 880d6e0175cSChristoph Hellwig case WRITE_VERIFY: 881d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 882d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 883499bf77bSNicholas Bellinger 884fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 885fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 886499bf77bSNicholas Bellinger 887f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 888f7b7c06fSNicholas Bellinger if (ret) 889f7b7c06fSNicholas Bellinger return ret; 890d6e0175cSChristoph Hellwig 891d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 892a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 893d6e0175cSChristoph Hellwig break; 894d6e0175cSChristoph Hellwig case WRITE_12: 895d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 896d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 897499bf77bSNicholas Bellinger 898fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 899fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 900499bf77bSNicholas Bellinger 901f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 902f7b7c06fSNicholas Bellinger if (ret) 903f7b7c06fSNicholas Bellinger return ret; 904d6e0175cSChristoph Hellwig 905d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 906a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 907d6e0175cSChristoph Hellwig break; 908d6e0175cSChristoph Hellwig case WRITE_16: 909d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 910d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 911499bf77bSNicholas Bellinger 912fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 913fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 914499bf77bSNicholas Bellinger 915f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 916f7b7c06fSNicholas Bellinger if (ret) 917f7b7c06fSNicholas Bellinger return ret; 918cd063befSNicholas Bellinger 919d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 920d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 921d6e0175cSChristoph Hellwig break; 922d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 923d6e0175cSChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 924d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 925d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 926d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 927d6e0175cSChristoph Hellwig 928fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 929fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 930fde9f50fSNicholas Bellinger 931d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 932d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 933d6e0175cSChristoph Hellwig 934d6e0175cSChristoph Hellwig /* 935d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 936d6e0175cSChristoph Hellwig */ 937d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 938d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 9390c2ad7d1SChristoph Hellwig break; 940d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 941d6e0175cSChristoph Hellwig { 942d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 943d6e0175cSChristoph Hellwig switch (service_action) { 944d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 9456f974e8cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 946de103c93SChristoph Hellwig 947fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 948fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 9496f974e8cSChristoph Hellwig /* 950d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 951d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 952d6e0175cSChristoph Hellwig */ 953d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 954de103c93SChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 955d6e0175cSChristoph Hellwig 956d6e0175cSChristoph Hellwig /* 9571fd032eeSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 958d6e0175cSChristoph Hellwig * completion. 959d6e0175cSChristoph Hellwig */ 960de103c93SChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 9616f974e8cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 962d6e0175cSChristoph Hellwig break; 963d6e0175cSChristoph Hellwig case WRITE_SAME_32: 964d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 965d6e0175cSChristoph Hellwig if (!sectors) { 966d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 967d6e0175cSChristoph Hellwig " supported\n"); 968d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 969d6e0175cSChristoph Hellwig } 970d6e0175cSChristoph Hellwig 971d6e0175cSChristoph Hellwig size = sbc_get_size(cmd, 1); 972d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 973d6e0175cSChristoph Hellwig 974d6e0175cSChristoph Hellwig ret = sbc_setup_write_same(cmd, &cdb[10], ops); 975d6e0175cSChristoph Hellwig if (ret) 9761fd032eeSChristoph Hellwig return ret; 977d6e0175cSChristoph Hellwig break; 978d6e0175cSChristoph Hellwig default: 979d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 980d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 981de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 982d6e0175cSChristoph Hellwig } 983d6e0175cSChristoph Hellwig break; 984d6e0175cSChristoph Hellwig } 98568ff9b9bSNicholas Bellinger case COMPARE_AND_WRITE: 98668ff9b9bSNicholas Bellinger sectors = cdb[13]; 98768ff9b9bSNicholas Bellinger /* 98868ff9b9bSNicholas Bellinger * Currently enforce COMPARE_AND_WRITE for a single sector 98968ff9b9bSNicholas Bellinger */ 99068ff9b9bSNicholas Bellinger if (sectors > 1) { 99168ff9b9bSNicholas Bellinger pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 99268ff9b9bSNicholas Bellinger " than 1\n", sectors); 99368ff9b9bSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 99468ff9b9bSNicholas Bellinger } 99568ff9b9bSNicholas Bellinger /* 99668ff9b9bSNicholas Bellinger * Double size because we have two buffers, note that 99768ff9b9bSNicholas Bellinger * zero is not an error.. 99868ff9b9bSNicholas Bellinger */ 99968ff9b9bSNicholas Bellinger size = 2 * sbc_get_size(cmd, sectors); 100068ff9b9bSNicholas Bellinger cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 100168ff9b9bSNicholas Bellinger cmd->t_task_nolb = sectors; 100268ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 100368ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_compare_and_write; 100468ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_callback; 100568ff9b9bSNicholas Bellinger break; 1006d6e0175cSChristoph Hellwig case READ_CAPACITY: 10071fd032eeSChristoph Hellwig size = READ_CAP_LEN; 10081fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 1009d6e0175cSChristoph Hellwig break; 1010eb846d9fSHannes Reinecke case SERVICE_ACTION_IN_16: 1011d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 1012d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 10131fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 1014d6e0175cSChristoph Hellwig break; 1015c66094bfSHannes Reinecke case SAI_REPORT_REFERRALS: 1016c66094bfSHannes Reinecke cmd->execute_cmd = target_emulate_report_referrals; 1017c66094bfSHannes Reinecke break; 1018d6e0175cSChristoph Hellwig default: 1019d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 1020d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 1021de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1022d6e0175cSChristoph Hellwig } 10231fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 1024d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 1025d6e0175cSChristoph Hellwig break; 1026d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 1027d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 1028d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 1029d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1030d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 1031d6e0175cSChristoph Hellwig } else { 1032d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1033d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 1034d6e0175cSChristoph Hellwig } 10356ef31dc7SChristophe Vu-Brugier if (ops->execute_sync_cache) { 1036ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 10376ef31dc7SChristophe Vu-Brugier goto check_lba; 10386ef31dc7SChristophe Vu-Brugier } 10396ef31dc7SChristophe Vu-Brugier size = 0; 10406ef31dc7SChristophe Vu-Brugier cmd->execute_cmd = sbc_emulate_noop; 1041d6e0175cSChristoph Hellwig break; 1042d6e0175cSChristoph Hellwig case UNMAP: 104314150a6bSChristoph Hellwig if (!ops->execute_unmap) 1044de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 104514150a6bSChristoph Hellwig 104661fdb4acSNicholas Bellinger if (!dev->dev_attrib.emulate_tpu) { 104761fdb4acSNicholas Bellinger pr_err("Got UNMAP, but backend device has" 104861fdb4acSNicholas Bellinger " emulate_tpu disabled\n"); 104961fdb4acSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 105061fdb4acSNicholas Bellinger } 10511fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 105262e46942SChristoph Hellwig cmd->execute_cmd = sbc_execute_unmap; 1053d6e0175cSChristoph Hellwig break; 1054d6e0175cSChristoph Hellwig case WRITE_SAME_16: 1055d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1056d6e0175cSChristoph Hellwig if (!sectors) { 1057d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1058de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1059d6e0175cSChristoph Hellwig } 1060d6e0175cSChristoph Hellwig 10611fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1062d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1063d6e0175cSChristoph Hellwig 1064cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10656b64e1feSDan Carpenter if (ret) 1066cd063befSNicholas Bellinger return ret; 1067d6e0175cSChristoph Hellwig break; 1068d6e0175cSChristoph Hellwig case WRITE_SAME: 1069d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1070d6e0175cSChristoph Hellwig if (!sectors) { 1071d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1072de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1073d6e0175cSChristoph Hellwig } 1074d6e0175cSChristoph Hellwig 10751fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1076d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1077d6e0175cSChristoph Hellwig 1078d6e0175cSChristoph Hellwig /* 1079d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1080d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 1081d6e0175cSChristoph Hellwig */ 1082cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10836b64e1feSDan Carpenter if (ret) 1084cd063befSNicholas Bellinger return ret; 1085d6e0175cSChristoph Hellwig break; 1086d6e0175cSChristoph Hellwig case VERIFY: 10871fd032eeSChristoph Hellwig size = 0; 1088c52716deSChristophe Vu-Brugier sectors = transport_get_sectors_10(cdb); 1089c52716deSChristophe Vu-Brugier cmd->t_task_lba = transport_lba_32(cdb); 10901920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 1091c52716deSChristophe Vu-Brugier goto check_lba; 10921a1ff38cSBernhard Kohl case REZERO_UNIT: 10931a1ff38cSBernhard Kohl case SEEK_6: 10941a1ff38cSBernhard Kohl case SEEK_10: 10951a1ff38cSBernhard Kohl /* 10961a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 10971a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 10981a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 10991a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 11001a1ff38cSBernhard Kohl */ 11011a1ff38cSBernhard Kohl size = 0; 11021a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 11031a1ff38cSBernhard Kohl break; 110445182ed5SBrian Bunker case START_STOP: 110545182ed5SBrian Bunker size = 0; 110645182ed5SBrian Bunker cmd->execute_cmd = sbc_emulate_startstop; 110745182ed5SBrian Bunker break; 1108d6e0175cSChristoph Hellwig default: 11091fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 1110d6e0175cSChristoph Hellwig if (ret) 1111d6e0175cSChristoph Hellwig return ret; 1112d6e0175cSChristoph Hellwig } 1113d6e0175cSChristoph Hellwig 1114d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 111520959c4bSAndy Grover if (!cmd->execute_cmd) 1116de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 1117d6e0175cSChristoph Hellwig 1118d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 11191fd032eeSChristoph Hellwig unsigned long long end_lba; 11206ef31dc7SChristophe Vu-Brugier check_lba: 11211fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 1122aa179935SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1123aa179935SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 11241fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 11251fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 11261fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 112709ceadc7SRoland Dreier return TCM_ADDRESS_OUT_OF_RANGE; 1128d6e0175cSChristoph Hellwig } 1129d6e0175cSChristoph Hellwig 113068ff9b9bSNicholas Bellinger if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 11311fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 11321fd032eeSChristoph Hellwig } 11331fd032eeSChristoph Hellwig 1134de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 1135d6e0175cSChristoph Hellwig } 1136d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 11376f23ac8aSChristoph Hellwig 11386f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 11396f23ac8aSChristoph Hellwig { 11406f23ac8aSChristoph Hellwig return TYPE_DISK; 11416f23ac8aSChristoph Hellwig } 11426f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 114386d71829SAsias He 114462e46942SChristoph Hellwig static sense_reason_t 114562e46942SChristoph Hellwig sbc_execute_unmap(struct se_cmd *cmd) 114686d71829SAsias He { 114762e46942SChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 114886d71829SAsias He struct se_device *dev = cmd->se_dev; 114986d71829SAsias He unsigned char *buf, *ptr = NULL; 115086d71829SAsias He sector_t lba; 115186d71829SAsias He int size; 115286d71829SAsias He u32 range; 115386d71829SAsias He sense_reason_t ret = 0; 115486d71829SAsias He int dl, bd_dl; 115586d71829SAsias He 115686d71829SAsias He /* We never set ANC_SUP */ 115786d71829SAsias He if (cmd->t_task_cdb[1]) 115886d71829SAsias He return TCM_INVALID_CDB_FIELD; 115986d71829SAsias He 116086d71829SAsias He if (cmd->data_length == 0) { 116186d71829SAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 116286d71829SAsias He return 0; 116386d71829SAsias He } 116486d71829SAsias He 116586d71829SAsias He if (cmd->data_length < 8) { 116686d71829SAsias He pr_warn("UNMAP parameter list length %u too small\n", 116786d71829SAsias He cmd->data_length); 116886d71829SAsias He return TCM_PARAMETER_LIST_LENGTH_ERROR; 116986d71829SAsias He } 117086d71829SAsias He 117186d71829SAsias He buf = transport_kmap_data_sg(cmd); 117286d71829SAsias He if (!buf) 117386d71829SAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 117486d71829SAsias He 117586d71829SAsias He dl = get_unaligned_be16(&buf[0]); 117686d71829SAsias He bd_dl = get_unaligned_be16(&buf[2]); 117786d71829SAsias He 117886d71829SAsias He size = cmd->data_length - 8; 117986d71829SAsias He if (bd_dl > size) 118086d71829SAsias He pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 118186d71829SAsias He cmd->data_length, bd_dl); 118286d71829SAsias He else 118386d71829SAsias He size = bd_dl; 118486d71829SAsias He 118586d71829SAsias He if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 118686d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 118786d71829SAsias He goto err; 118886d71829SAsias He } 118986d71829SAsias He 119086d71829SAsias He /* First UNMAP block descriptor starts at 8 byte offset */ 119186d71829SAsias He ptr = &buf[8]; 119286d71829SAsias He pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 119386d71829SAsias He " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 119486d71829SAsias He 119586d71829SAsias He while (size >= 16) { 119686d71829SAsias He lba = get_unaligned_be64(&ptr[0]); 119786d71829SAsias He range = get_unaligned_be32(&ptr[8]); 119886d71829SAsias He pr_debug("UNMAP: Using lba: %llu and range: %u\n", 119986d71829SAsias He (unsigned long long)lba, range); 120086d71829SAsias He 120186d71829SAsias He if (range > dev->dev_attrib.max_unmap_lba_count) { 120286d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 120386d71829SAsias He goto err; 120486d71829SAsias He } 120586d71829SAsias He 120686d71829SAsias He if (lba + range > dev->transport->get_blocks(dev) + 1) { 120786d71829SAsias He ret = TCM_ADDRESS_OUT_OF_RANGE; 120886d71829SAsias He goto err; 120986d71829SAsias He } 121086d71829SAsias He 121162e46942SChristoph Hellwig ret = ops->execute_unmap(cmd, lba, range); 121286d71829SAsias He if (ret) 121386d71829SAsias He goto err; 121486d71829SAsias He 121586d71829SAsias He ptr += 16; 121686d71829SAsias He size -= 16; 121786d71829SAsias He } 121886d71829SAsias He 121986d71829SAsias He err: 122086d71829SAsias He transport_kunmap_data_sg(cmd); 122186d71829SAsias He if (!ret) 122286d71829SAsias He target_complete_cmd(cmd, GOOD); 122386d71829SAsias He return ret; 122486d71829SAsias He } 122541861fa8SNicholas Bellinger 122666a3d5bcSNicholas Bellinger void 122766a3d5bcSNicholas Bellinger sbc_dif_generate(struct se_cmd *cmd) 122866a3d5bcSNicholas Bellinger { 122966a3d5bcSNicholas Bellinger struct se_device *dev = cmd->se_dev; 1230fe052a18SSagi Grimberg struct t10_pi_tuple *sdt; 123118213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg, *psg; 123266a3d5bcSNicholas Bellinger sector_t sector = cmd->t_task_lba; 123366a3d5bcSNicholas Bellinger void *daddr, *paddr; 123466a3d5bcSNicholas Bellinger int i, j, offset = 0; 123518213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 123666a3d5bcSNicholas Bellinger 123718213afbSAkinobu Mita for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 123818213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 123966a3d5bcSNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 124066a3d5bcSNicholas Bellinger 124118213afbSAkinobu Mita for (j = 0; j < psg->length; 1242fe052a18SSagi Grimberg j += sizeof(*sdt)) { 124318213afbSAkinobu Mita __u16 crc; 124418213afbSAkinobu Mita unsigned int avail; 124566a3d5bcSNicholas Bellinger 124618213afbSAkinobu Mita if (offset >= dsg->length) { 124718213afbSAkinobu Mita offset -= dsg->length; 124818213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 124918213afbSAkinobu Mita dsg = sg_next(dsg); 125018213afbSAkinobu Mita if (!dsg) { 125118213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 125218213afbSAkinobu Mita return; 125318213afbSAkinobu Mita } 125418213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 125566a3d5bcSNicholas Bellinger } 125666a3d5bcSNicholas Bellinger 125718213afbSAkinobu Mita sdt = paddr + j; 125818213afbSAkinobu Mita avail = min(block_size, dsg->length - offset); 125918213afbSAkinobu Mita crc = crc_t10dif(daddr + offset, avail); 126018213afbSAkinobu Mita if (avail < block_size) { 126118213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 126218213afbSAkinobu Mita dsg = sg_next(dsg); 126318213afbSAkinobu Mita if (!dsg) { 126418213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 126518213afbSAkinobu Mita return; 126618213afbSAkinobu Mita } 126718213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 126818213afbSAkinobu Mita offset = block_size - avail; 126918213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, offset); 127018213afbSAkinobu Mita } else { 127118213afbSAkinobu Mita offset += block_size; 127218213afbSAkinobu Mita } 127318213afbSAkinobu Mita 127418213afbSAkinobu Mita sdt->guard_tag = cpu_to_be16(crc); 1275823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 127666a3d5bcSNicholas Bellinger sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 127766a3d5bcSNicholas Bellinger sdt->app_tag = 0; 127866a3d5bcSNicholas Bellinger 12796ae50408SNicholas Bellinger pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 128066a3d5bcSNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 12816ae50408SNicholas Bellinger (cmd->data_direction == DMA_TO_DEVICE) ? 12826ae50408SNicholas Bellinger "WRITE" : "READ", (unsigned long long)sector, 12836ae50408SNicholas Bellinger sdt->guard_tag, sdt->app_tag, 12846ae50408SNicholas Bellinger be32_to_cpu(sdt->ref_tag)); 128566a3d5bcSNicholas Bellinger 128666a3d5bcSNicholas Bellinger sector++; 128766a3d5bcSNicholas Bellinger } 128866a3d5bcSNicholas Bellinger 128918213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 129018213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 129166a3d5bcSNicholas Bellinger } 129266a3d5bcSNicholas Bellinger } 129366a3d5bcSNicholas Bellinger 129441861fa8SNicholas Bellinger static sense_reason_t 1295fe052a18SSagi Grimberg sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 129618213afbSAkinobu Mita __u16 crc, sector_t sector, unsigned int ei_lba) 129741861fa8SNicholas Bellinger { 129841861fa8SNicholas Bellinger __be16 csum; 129941861fa8SNicholas Bellinger 1300d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1301d7a463b0SNicholas Bellinger goto check_ref; 1302d7a463b0SNicholas Bellinger 130318213afbSAkinobu Mita csum = cpu_to_be16(crc); 130441861fa8SNicholas Bellinger 130541861fa8SNicholas Bellinger if (sdt->guard_tag != csum) { 130641861fa8SNicholas Bellinger pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 130741861fa8SNicholas Bellinger " csum 0x%04x\n", (unsigned long long)sector, 130841861fa8SNicholas Bellinger be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 130941861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 131041861fa8SNicholas Bellinger } 131141861fa8SNicholas Bellinger 1312d7a463b0SNicholas Bellinger check_ref: 1313d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1314d7a463b0SNicholas Bellinger return 0; 1315d7a463b0SNicholas Bellinger 1316823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 131741861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 131841861fa8SNicholas Bellinger pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 131941861fa8SNicholas Bellinger " sector MSB: 0x%08x\n", (unsigned long long)sector, 132041861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 132141861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 132241861fa8SNicholas Bellinger } 132341861fa8SNicholas Bellinger 1324823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 132541861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != ei_lba) { 132641861fa8SNicholas Bellinger pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 132741861fa8SNicholas Bellinger " ei_lba: 0x%08x\n", (unsigned long long)sector, 132841861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), ei_lba); 132941861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 133041861fa8SNicholas Bellinger } 133141861fa8SNicholas Bellinger 133241861fa8SNicholas Bellinger return 0; 133341861fa8SNicholas Bellinger } 133441861fa8SNicholas Bellinger 1335f75b6faeSSagi Grimberg void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 133641861fa8SNicholas Bellinger struct scatterlist *sg, int sg_off) 133741861fa8SNicholas Bellinger { 133841861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 133941861fa8SNicholas Bellinger struct scatterlist *psg; 134041861fa8SNicholas Bellinger void *paddr, *addr; 134141861fa8SNicholas Bellinger unsigned int i, len, left; 134210762e80SNicholas Bellinger unsigned int offset = sg_off; 134341861fa8SNicholas Bellinger 134438b57f82SNicholas Bellinger if (!sg) 134538b57f82SNicholas Bellinger return; 134638b57f82SNicholas Bellinger 134741861fa8SNicholas Bellinger left = sectors * dev->prot_length; 134841861fa8SNicholas Bellinger 134941861fa8SNicholas Bellinger for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 135016c0ae02SSagi Grimberg unsigned int psg_len, copied = 0; 135141861fa8SNicholas Bellinger 135216c0ae02SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 135316c0ae02SSagi Grimberg psg_len = min(left, psg->length); 135416c0ae02SSagi Grimberg while (psg_len) { 135516c0ae02SSagi Grimberg len = min(psg_len, sg->length - offset); 135616c0ae02SSagi Grimberg addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 135716c0ae02SSagi Grimberg 135816c0ae02SSagi Grimberg if (read) 135916c0ae02SSagi Grimberg memcpy(paddr + copied, addr, len); 136016c0ae02SSagi Grimberg else 136116c0ae02SSagi Grimberg memcpy(addr, paddr + copied, len); 136216c0ae02SSagi Grimberg 136316c0ae02SSagi Grimberg left -= len; 136416c0ae02SSagi Grimberg offset += len; 136516c0ae02SSagi Grimberg copied += len; 136616c0ae02SSagi Grimberg psg_len -= len; 136716c0ae02SSagi Grimberg 136857636388SAkinobu Mita kunmap_atomic(addr - sg->offset - offset); 136957636388SAkinobu Mita 1370d6a65fdcSSagi Grimberg if (offset >= sg->length) { 1371d6a65fdcSSagi Grimberg sg = sg_next(sg); 1372d6a65fdcSSagi Grimberg offset = 0; 1373d6a65fdcSSagi Grimberg } 137441861fa8SNicholas Bellinger } 137557636388SAkinobu Mita kunmap_atomic(paddr - psg->offset); 137616c0ae02SSagi Grimberg } 137741861fa8SNicholas Bellinger } 1378f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_copy_prot); 137941861fa8SNicholas Bellinger 138041861fa8SNicholas Bellinger sense_reason_t 1381f75b6faeSSagi Grimberg sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1382414e4627SSagi Grimberg unsigned int ei_lba, struct scatterlist *psg, int psg_off) 138341861fa8SNicholas Bellinger { 138441861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 1385fe052a18SSagi Grimberg struct t10_pi_tuple *sdt; 138618213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg; 138741861fa8SNicholas Bellinger sector_t sector = start; 138841861fa8SNicholas Bellinger void *daddr, *paddr; 138918213afbSAkinobu Mita int i; 139041861fa8SNicholas Bellinger sense_reason_t rc; 139118213afbSAkinobu Mita int dsg_off = 0; 139218213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 139341861fa8SNicholas Bellinger 139418213afbSAkinobu Mita for (; psg && sector < start + sectors; psg = sg_next(psg)) { 139518213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 139641861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 139741861fa8SNicholas Bellinger 139818213afbSAkinobu Mita for (i = psg_off; i < psg->length && 139918213afbSAkinobu Mita sector < start + sectors; 1400fe052a18SSagi Grimberg i += sizeof(*sdt)) { 140118213afbSAkinobu Mita __u16 crc; 140218213afbSAkinobu Mita unsigned int avail; 140341861fa8SNicholas Bellinger 140418213afbSAkinobu Mita if (dsg_off >= dsg->length) { 140518213afbSAkinobu Mita dsg_off -= dsg->length; 140618213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 140718213afbSAkinobu Mita dsg = sg_next(dsg); 140818213afbSAkinobu Mita if (!dsg) { 1409414e4627SSagi Grimberg kunmap_atomic(paddr - psg->offset); 141041861fa8SNicholas Bellinger return 0; 141141861fa8SNicholas Bellinger } 141241861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 141341861fa8SNicholas Bellinger } 141441861fa8SNicholas Bellinger 141518213afbSAkinobu Mita sdt = paddr + i; 141641861fa8SNicholas Bellinger 141741861fa8SNicholas Bellinger pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 141841861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 141941861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 142041861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 142141861fa8SNicholas Bellinger 142241861fa8SNicholas Bellinger if (sdt->app_tag == cpu_to_be16(0xffff)) { 142318213afbSAkinobu Mita dsg_off += block_size; 142418213afbSAkinobu Mita goto next; 142541861fa8SNicholas Bellinger } 142641861fa8SNicholas Bellinger 142718213afbSAkinobu Mita avail = min(block_size, dsg->length - dsg_off); 142818213afbSAkinobu Mita crc = crc_t10dif(daddr + dsg_off, avail); 142918213afbSAkinobu Mita if (avail < block_size) { 1430414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 143118213afbSAkinobu Mita dsg = sg_next(dsg); 143218213afbSAkinobu Mita if (!dsg) { 143318213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 143418213afbSAkinobu Mita return 0; 143518213afbSAkinobu Mita } 143618213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 143718213afbSAkinobu Mita dsg_off = block_size - avail; 143818213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, dsg_off); 143918213afbSAkinobu Mita } else { 144018213afbSAkinobu Mita dsg_off += block_size; 144118213afbSAkinobu Mita } 144218213afbSAkinobu Mita 144318213afbSAkinobu Mita rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 144441861fa8SNicholas Bellinger if (rc) { 144518213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 144618213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 144776736db3SSagi Grimberg cmd->bad_sector = sector; 144841861fa8SNicholas Bellinger return rc; 144941861fa8SNicholas Bellinger } 145018213afbSAkinobu Mita next: 145141861fa8SNicholas Bellinger sector++; 145241861fa8SNicholas Bellinger ei_lba++; 145341861fa8SNicholas Bellinger } 145441861fa8SNicholas Bellinger 145518213afbSAkinobu Mita psg_off = 0; 1456414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 145718213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 145841861fa8SNicholas Bellinger } 145941861fa8SNicholas Bellinger 146041861fa8SNicholas Bellinger return 0; 146141861fa8SNicholas Bellinger } 1462f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_verify); 1463