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> 278dcf07beSBart Van Assche #include <linux/t10-pi.h> 28d6e0175cSChristoph Hellwig #include <asm/unaligned.h> 29ba929992SBart Van Assche #include <scsi/scsi_proto.h> 3068ff9b9bSNicholas Bellinger #include <scsi/scsi_tcq.h> 31d6e0175cSChristoph Hellwig 32d6e0175cSChristoph Hellwig #include <target/target_core_base.h> 33d6e0175cSChristoph Hellwig #include <target/target_core_backend.h> 34d6e0175cSChristoph Hellwig #include <target/target_core_fabric.h> 35d6e0175cSChristoph Hellwig 36d6e0175cSChristoph Hellwig #include "target_core_internal.h" 37d6e0175cSChristoph Hellwig #include "target_core_ua.h" 38c66094bfSHannes Reinecke #include "target_core_alua.h" 39d6e0175cSChristoph Hellwig 40de103c93SChristoph Hellwig static sense_reason_t 41afd73f1bSNicholas Bellinger sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 4262e46942SChristoph Hellwig static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); 43afd73f1bSNicholas Bellinger 44afd73f1bSNicholas Bellinger static sense_reason_t 45de103c93SChristoph Hellwig sbc_emulate_readcapacity(struct se_cmd *cmd) 461fd032eeSChristoph Hellwig { 471fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 488dc8632aSRoland Dreier unsigned char *cdb = cmd->t_task_cdb; 491fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 50a50da144SPaolo Bonzini unsigned char *rbuf; 51a50da144SPaolo Bonzini unsigned char buf[8]; 521fd032eeSChristoph Hellwig u32 blocks; 531fd032eeSChristoph Hellwig 548dc8632aSRoland Dreier /* 558dc8632aSRoland Dreier * SBC-2 says: 568dc8632aSRoland Dreier * If the PMI bit is set to zero and the LOGICAL BLOCK 578dc8632aSRoland Dreier * ADDRESS field is not set to zero, the device server shall 588dc8632aSRoland Dreier * terminate the command with CHECK CONDITION status with 598dc8632aSRoland Dreier * the sense key set to ILLEGAL REQUEST and the additional 608dc8632aSRoland Dreier * sense code set to INVALID FIELD IN CDB. 618dc8632aSRoland Dreier * 628dc8632aSRoland Dreier * In SBC-3, these fields are obsolete, but some SCSI 638dc8632aSRoland Dreier * compliance tests actually check this, so we might as well 648dc8632aSRoland Dreier * follow SBC-2. 658dc8632aSRoland Dreier */ 668dc8632aSRoland Dreier if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 678dc8632aSRoland Dreier return TCM_INVALID_CDB_FIELD; 688dc8632aSRoland Dreier 691fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 701fd032eeSChristoph Hellwig blocks = 0xffffffff; 711fd032eeSChristoph Hellwig else 721fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 731fd032eeSChristoph Hellwig 741fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 751fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 761fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 771fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 780fd97ccfSChristoph Hellwig buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 790fd97ccfSChristoph Hellwig buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 800fd97ccfSChristoph Hellwig buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 810fd97ccfSChristoph Hellwig buf[7] = dev->dev_attrib.block_size & 0xff; 821fd032eeSChristoph Hellwig 83a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 848b4b0dcbSNicholas Bellinger if (rbuf) { 85a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 861fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 878b4b0dcbSNicholas Bellinger } 881fd032eeSChristoph Hellwig 892426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 8); 901fd032eeSChristoph Hellwig return 0; 911fd032eeSChristoph Hellwig } 921fd032eeSChristoph Hellwig 93de103c93SChristoph Hellwig static sense_reason_t 94de103c93SChristoph Hellwig sbc_emulate_readcapacity_16(struct se_cmd *cmd) 951fd032eeSChristoph Hellwig { 961fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 972d335983SNicholas Bellinger struct se_session *sess = cmd->se_sess; 989ef5466eSNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 999ef5466eSNicholas Bellinger 100a50da144SPaolo Bonzini unsigned char *rbuf; 101a50da144SPaolo Bonzini unsigned char buf[32]; 1021fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 1031fd032eeSChristoph Hellwig 104a50da144SPaolo Bonzini memset(buf, 0, sizeof(buf)); 1051fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 1061fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 1071fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 1081fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 1091fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 1101fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 1111fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 1121fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 1130fd97ccfSChristoph Hellwig buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 1140fd97ccfSChristoph Hellwig buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 1150fd97ccfSChristoph Hellwig buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 1160fd97ccfSChristoph Hellwig buf[11] = dev->dev_attrib.block_size & 0xff; 11756dac14cSNicholas Bellinger /* 11856dac14cSNicholas Bellinger * Set P_TYPE and PROT_EN bits for DIF support 11956dac14cSNicholas Bellinger */ 1202d335983SNicholas Bellinger if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 1219ef5466eSNicholas Bellinger /* 1229ef5466eSNicholas Bellinger * Only override a device's pi_prot_type if no T10-PI is 1239ef5466eSNicholas Bellinger * available, and sess_prot_type has been explicitly enabled. 1249ef5466eSNicholas Bellinger */ 1259ef5466eSNicholas Bellinger if (!pi_prot_type) 1269ef5466eSNicholas Bellinger pi_prot_type = sess->sess_prot_type; 1279ef5466eSNicholas Bellinger 1289ef5466eSNicholas Bellinger if (pi_prot_type) 1299ef5466eSNicholas Bellinger buf[12] = (pi_prot_type - 1) << 1 | 0x1; 1302d335983SNicholas Bellinger } 1317f7caf6aSAndy Grover 1327f7caf6aSAndy Grover if (dev->transport->get_lbppbe) 1337f7caf6aSAndy Grover buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 1347f7caf6aSAndy Grover 1357f7caf6aSAndy Grover if (dev->transport->get_alignment_offset_lbas) { 1367f7caf6aSAndy Grover u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 1377f7caf6aSAndy Grover buf[14] = (lalba >> 8) & 0x3f; 1387f7caf6aSAndy Grover buf[15] = lalba & 0xff; 1397f7caf6aSAndy Grover } 1407f7caf6aSAndy Grover 1411fd032eeSChristoph Hellwig /* 1421fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 1431fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 1441fd032eeSChristoph Hellwig */ 145e6f41633SJamie Pocas if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { 1467f7caf6aSAndy Grover buf[14] |= 0x80; 1471fd032eeSChristoph Hellwig 148e6f41633SJamie Pocas /* 149e6f41633SJamie Pocas * LBPRZ signifies that zeroes will be read back from an LBA after 150e6f41633SJamie Pocas * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) 151e6f41633SJamie Pocas */ 152e6f41633SJamie Pocas if (dev->dev_attrib.unmap_zeroes_data) 153e6f41633SJamie Pocas buf[14] |= 0x40; 154e6f41633SJamie Pocas } 155e6f41633SJamie Pocas 156a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 1578b4b0dcbSNicholas Bellinger if (rbuf) { 158a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1591fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1608b4b0dcbSNicholas Bellinger } 1611fd032eeSChristoph Hellwig 1622426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 32); 1631fd032eeSChristoph Hellwig return 0; 1641fd032eeSChristoph Hellwig } 1651fd032eeSChristoph Hellwig 16645182ed5SBrian Bunker static sense_reason_t 16745182ed5SBrian Bunker sbc_emulate_startstop(struct se_cmd *cmd) 16845182ed5SBrian Bunker { 16945182ed5SBrian Bunker unsigned char *cdb = cmd->t_task_cdb; 17045182ed5SBrian Bunker 17145182ed5SBrian Bunker /* 17245182ed5SBrian Bunker * See sbc3r36 section 5.25 17345182ed5SBrian Bunker * Immediate bit should be set since there is nothing to complete 17445182ed5SBrian Bunker * POWER CONDITION MODIFIER 0h 17545182ed5SBrian Bunker */ 17645182ed5SBrian Bunker if (!(cdb[1] & 1) || cdb[2] || cdb[3]) 17745182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 17845182ed5SBrian Bunker 17945182ed5SBrian Bunker /* 18045182ed5SBrian Bunker * See sbc3r36 section 5.25 18145182ed5SBrian Bunker * POWER CONDITION 0h START_VALID - process START and LOEJ 18245182ed5SBrian Bunker */ 18345182ed5SBrian Bunker if (cdb[4] >> 4 & 0xf) 18445182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 18545182ed5SBrian Bunker 18645182ed5SBrian Bunker /* 18745182ed5SBrian Bunker * See sbc3r36 section 5.25 18845182ed5SBrian Bunker * LOEJ 0h - nothing to load or unload 18945182ed5SBrian Bunker * START 1h - we are ready 19045182ed5SBrian Bunker */ 19145182ed5SBrian Bunker if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) 19245182ed5SBrian Bunker return TCM_INVALID_CDB_FIELD; 19345182ed5SBrian Bunker 19445182ed5SBrian Bunker target_complete_cmd(cmd, SAM_STAT_GOOD); 19545182ed5SBrian Bunker return 0; 19645182ed5SBrian Bunker } 19745182ed5SBrian Bunker 198972b29c8SRoland Dreier sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 1991fd032eeSChristoph Hellwig { 2001fd032eeSChristoph Hellwig u32 num_blocks; 2011fd032eeSChristoph Hellwig 2021fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 2031fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 2041fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 2051fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 2061fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 2071fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 2081fd032eeSChristoph Hellwig 2091fd032eeSChristoph Hellwig /* 2101fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 2111fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 2121fd032eeSChristoph Hellwig */ 2136f974e8cSChristoph Hellwig if (num_blocks) 2146f974e8cSChristoph Hellwig return num_blocks; 2151fd032eeSChristoph Hellwig 2166f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 2176f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 2181fd032eeSChristoph Hellwig } 219972b29c8SRoland Dreier EXPORT_SYMBOL(sbc_get_write_same_sectors); 2201fd032eeSChristoph Hellwig 221de103c93SChristoph Hellwig static sense_reason_t 222b753d643SChristoph Hellwig sbc_execute_write_same_unmap(struct se_cmd *cmd) 223b753d643SChristoph Hellwig { 224b753d643SChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 225b753d643SChristoph Hellwig sector_t nolb = sbc_get_write_same_sectors(cmd); 226b753d643SChristoph Hellwig sense_reason_t ret; 227b753d643SChristoph Hellwig 228b753d643SChristoph Hellwig if (nolb) { 229b753d643SChristoph Hellwig ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); 230b753d643SChristoph Hellwig if (ret) 231b753d643SChristoph Hellwig return ret; 232b753d643SChristoph Hellwig } 233b753d643SChristoph Hellwig 234b753d643SChristoph Hellwig target_complete_cmd(cmd, GOOD); 235b753d643SChristoph Hellwig return 0; 236b753d643SChristoph Hellwig } 237b753d643SChristoph Hellwig 238b753d643SChristoph Hellwig static sense_reason_t 2391920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 2401a1ff38cSBernhard Kohl { 2411a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 2421a1ff38cSBernhard Kohl return 0; 2431a1ff38cSBernhard Kohl } 2441a1ff38cSBernhard Kohl 245d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 246d6e0175cSChristoph Hellwig { 2470fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 248d6e0175cSChristoph Hellwig } 249d6e0175cSChristoph Hellwig 250d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 251d6e0175cSChristoph Hellwig { 252d6e0175cSChristoph Hellwig /* 253d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 254d6e0175cSChristoph Hellwig * 255d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 256d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 257d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 258d6e0175cSChristoph Hellwig * written. 259d6e0175cSChristoph Hellwig */ 260d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 261d6e0175cSChristoph Hellwig } 262d6e0175cSChristoph Hellwig 263d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 264d6e0175cSChristoph Hellwig { 265d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 266d6e0175cSChristoph Hellwig } 267d6e0175cSChristoph Hellwig 268d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 269d6e0175cSChristoph Hellwig { 270d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 271d6e0175cSChristoph Hellwig } 272d6e0175cSChristoph Hellwig 273d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 274d6e0175cSChristoph Hellwig { 275d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 276d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 277d6e0175cSChristoph Hellwig } 278d6e0175cSChristoph Hellwig 279d6e0175cSChristoph Hellwig /* 280d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 281d6e0175cSChristoph Hellwig */ 282d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 283d6e0175cSChristoph Hellwig { 284d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 285d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 286d6e0175cSChristoph Hellwig 287d6e0175cSChristoph Hellwig } 288d6e0175cSChristoph Hellwig 289d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 290d6e0175cSChristoph Hellwig { 291d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 292d6e0175cSChristoph Hellwig } 293d6e0175cSChristoph Hellwig 294d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 295d6e0175cSChristoph Hellwig { 296d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 297d6e0175cSChristoph Hellwig } 298d6e0175cSChristoph Hellwig 299d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 300d6e0175cSChristoph Hellwig { 301d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 302d6e0175cSChristoph Hellwig 303d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 304d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 305d6e0175cSChristoph Hellwig 306d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 307d6e0175cSChristoph Hellwig } 308d6e0175cSChristoph Hellwig 309d6e0175cSChristoph Hellwig /* 310d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 311d6e0175cSChristoph Hellwig */ 312d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 313d6e0175cSChristoph Hellwig { 314d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 315d6e0175cSChristoph Hellwig 316d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 317d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 318d6e0175cSChristoph Hellwig 319d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 320d6e0175cSChristoph Hellwig } 321d6e0175cSChristoph Hellwig 322cd063befSNicholas Bellinger static sense_reason_t 323cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 324d6e0175cSChristoph Hellwig { 3258e575c50SNicholas Bellinger struct se_device *dev = cmd->se_dev; 3268e575c50SNicholas Bellinger sector_t end_lba = dev->transport->get_blocks(dev) + 1; 327972b29c8SRoland Dreier unsigned int sectors = sbc_get_write_same_sectors(cmd); 328afd73f1bSNicholas Bellinger sense_reason_t ret; 329773cbaf7SNicholas Bellinger 330d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 331d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 332d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 333d6e0175cSChristoph Hellwig " Emulation\n"); 334cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 335d6e0175cSChristoph Hellwig } 336773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 337773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 338773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 339773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 340773cbaf7SNicholas Bellinger } 3418e575c50SNicholas Bellinger /* 3428e575c50SNicholas Bellinger * Sanity check for LBA wrap and request past end of device. 3438e575c50SNicholas Bellinger */ 3448e575c50SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 3458e575c50SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 3468e575c50SNicholas Bellinger pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 3478e575c50SNicholas Bellinger (unsigned long long)end_lba, cmd->t_task_lba, sectors); 3488e575c50SNicholas Bellinger return TCM_ADDRESS_OUT_OF_RANGE; 3498e575c50SNicholas Bellinger } 3508e575c50SNicholas Bellinger 3515cb770bfSRoland Dreier /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 3525cb770bfSRoland Dreier if (flags[0] & 0x10) { 3535cb770bfSRoland Dreier pr_warn("WRITE SAME with ANCHOR not supported\n"); 3545cb770bfSRoland Dreier return TCM_INVALID_CDB_FIELD; 3555cb770bfSRoland Dreier } 356d6e0175cSChristoph Hellwig /* 357cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 358cd063befSNicholas Bellinger * translated into block discard requests within backend code. 359d6e0175cSChristoph Hellwig */ 360cd063befSNicholas Bellinger if (flags[0] & 0x08) { 361b753d643SChristoph Hellwig if (!ops->execute_unmap) 362cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 363d6e0175cSChristoph Hellwig 364d0a91295SNicholas Bellinger if (!dev->dev_attrib.emulate_tpws) { 365d0a91295SNicholas Bellinger pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 366d0a91295SNicholas Bellinger " has emulate_tpws disabled\n"); 367d0a91295SNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 368d0a91295SNicholas Bellinger } 369b753d643SChristoph Hellwig cmd->execute_cmd = sbc_execute_write_same_unmap; 370cd063befSNicholas Bellinger return 0; 371cd063befSNicholas Bellinger } 372cd063befSNicholas Bellinger if (!ops->execute_write_same) 373cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 374cd063befSNicholas Bellinger 375afd73f1bSNicholas Bellinger ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 376afd73f1bSNicholas Bellinger if (ret) 377afd73f1bSNicholas Bellinger return ret; 378afd73f1bSNicholas Bellinger 379cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 380d6e0175cSChristoph Hellwig return 0; 381d6e0175cSChristoph Hellwig } 382d6e0175cSChristoph Hellwig 383057085e5SNicholas Bellinger static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, 384057085e5SNicholas Bellinger int *post_ret) 385d6e0175cSChristoph Hellwig { 386d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 387d6e0175cSChristoph Hellwig struct scatterlist *sg; 388d6e0175cSChristoph Hellwig unsigned int offset; 389a6b0133cSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 390a6b0133cSNicholas Bellinger int i, count; 391d6e0175cSChristoph Hellwig /* 392d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 393d6e0175cSChristoph Hellwig * 394d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 395d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 396d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 397d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 398d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 399d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 400d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 401d6e0175cSChristoph Hellwig */ 402d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 403d6e0175cSChristoph Hellwig if (!buf) { 404d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 405a6b0133cSNicholas Bellinger return TCM_OUT_OF_RESOURCES; 406d6e0175cSChristoph Hellwig } 407d6e0175cSChristoph Hellwig /* 408d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 409d6e0175cSChristoph Hellwig * into the locally allocated *buf 410d6e0175cSChristoph Hellwig */ 411d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 412d6e0175cSChristoph Hellwig cmd->t_data_nents, 413d6e0175cSChristoph Hellwig buf, 414d6e0175cSChristoph Hellwig cmd->data_length); 415d6e0175cSChristoph Hellwig 416d6e0175cSChristoph Hellwig /* 417d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 418d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 419d6e0175cSChristoph Hellwig */ 420d6e0175cSChristoph Hellwig 421d6e0175cSChristoph Hellwig offset = 0; 422d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 423d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 424a6b0133cSNicholas Bellinger if (!addr) { 425a6b0133cSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 426d6e0175cSChristoph Hellwig goto out; 427a6b0133cSNicholas Bellinger } 428d6e0175cSChristoph Hellwig 429d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 430d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 431d6e0175cSChristoph Hellwig 432d6e0175cSChristoph Hellwig offset += sg->length; 433d6e0175cSChristoph Hellwig kunmap_atomic(addr); 434d6e0175cSChristoph Hellwig } 435d6e0175cSChristoph Hellwig 436d6e0175cSChristoph Hellwig out: 437d6e0175cSChristoph Hellwig kfree(buf); 438a6b0133cSNicholas Bellinger return ret; 439d6e0175cSChristoph Hellwig } 440d6e0175cSChristoph Hellwig 441a82a9538SNicholas Bellinger static sense_reason_t 442a82a9538SNicholas Bellinger sbc_execute_rw(struct se_cmd *cmd) 443a82a9538SNicholas Bellinger { 4447a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 4457a971b1bSChristoph Hellwig 4467a971b1bSChristoph Hellwig return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 447a82a9538SNicholas Bellinger cmd->data_direction); 448a82a9538SNicholas Bellinger } 449a82a9538SNicholas Bellinger 450057085e5SNicholas Bellinger static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, 451057085e5SNicholas Bellinger int *post_ret) 45268ff9b9bSNicholas Bellinger { 45368ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 4549b2792c3SNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 45568ff9b9bSNicholas Bellinger 456d8855c15SNicholas Bellinger /* 457d8855c15SNicholas Bellinger * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 458d8855c15SNicholas Bellinger * within target_complete_ok_work() if the command was successfully 459d8855c15SNicholas Bellinger * sent to the backend driver. 460d8855c15SNicholas Bellinger */ 461d8855c15SNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 4629b2792c3SNicholas Bellinger if (cmd->transport_state & CMD_T_SENT) { 46368ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 464057085e5SNicholas Bellinger *post_ret = 1; 4659b2792c3SNicholas Bellinger 4669b2792c3SNicholas Bellinger if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 4679b2792c3SNicholas Bellinger ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 468057085e5SNicholas Bellinger } 469d8855c15SNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 470d8855c15SNicholas Bellinger 47168ff9b9bSNicholas Bellinger /* 47268ff9b9bSNicholas Bellinger * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 47368ff9b9bSNicholas Bellinger * before the original READ I/O submission. 47468ff9b9bSNicholas Bellinger */ 47568ff9b9bSNicholas Bellinger up(&dev->caw_sem); 47668ff9b9bSNicholas Bellinger 4779b2792c3SNicholas Bellinger return ret; 47868ff9b9bSNicholas Bellinger } 47968ff9b9bSNicholas Bellinger 480057085e5SNicholas Bellinger static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, 481057085e5SNicholas Bellinger int *post_ret) 48268ff9b9bSNicholas Bellinger { 48368ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 48468ff9b9bSNicholas Bellinger struct scatterlist *write_sg = NULL, *sg; 485db60df88SNicholas Bellinger unsigned char *buf = NULL, *addr; 48668ff9b9bSNicholas Bellinger struct sg_mapping_iter m; 48768ff9b9bSNicholas Bellinger unsigned int offset = 0, len; 48868ff9b9bSNicholas Bellinger unsigned int nlbas = cmd->t_task_nolb; 48968ff9b9bSNicholas Bellinger unsigned int block_size = dev->dev_attrib.block_size; 49068ff9b9bSNicholas Bellinger unsigned int compare_len = (nlbas * block_size); 49168ff9b9bSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 49268ff9b9bSNicholas Bellinger int rc, i; 49368ff9b9bSNicholas Bellinger 494cf6d1f09SNicholas Bellinger /* 495cf6d1f09SNicholas Bellinger * Handle early failure in transport_generic_request_failure(), 496c8e63985SNicholas Bellinger * which will not have taken ->caw_sem yet.. 497cf6d1f09SNicholas Bellinger */ 498c8e63985SNicholas Bellinger if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 499cf6d1f09SNicholas Bellinger return TCM_NO_SENSE; 500db60df88SNicholas Bellinger /* 501c8e63985SNicholas Bellinger * Handle special case for zero-length COMPARE_AND_WRITE 502c8e63985SNicholas Bellinger */ 503c8e63985SNicholas Bellinger if (!cmd->data_length) 504c8e63985SNicholas Bellinger goto out; 505c8e63985SNicholas Bellinger /* 506db60df88SNicholas Bellinger * Immediately exit + release dev->caw_sem if command has already 507db60df88SNicholas Bellinger * been failed with a non-zero SCSI status. 508db60df88SNicholas Bellinger */ 509db60df88SNicholas Bellinger if (cmd->scsi_status) { 510a71a5dc7SNicholas Bellinger pr_debug("compare_and_write_callback: non zero scsi_status:" 511db60df88SNicholas Bellinger " 0x%02x\n", cmd->scsi_status); 512a71a5dc7SNicholas Bellinger *post_ret = 1; 513a71a5dc7SNicholas Bellinger if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) 514a71a5dc7SNicholas Bellinger ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 515db60df88SNicholas Bellinger goto out; 516db60df88SNicholas Bellinger } 517cf6d1f09SNicholas Bellinger 51868ff9b9bSNicholas Bellinger buf = kzalloc(cmd->data_length, GFP_KERNEL); 51968ff9b9bSNicholas Bellinger if (!buf) { 52068ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write buf\n"); 521a2890087SNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 522a2890087SNicholas Bellinger goto out; 52368ff9b9bSNicholas Bellinger } 52468ff9b9bSNicholas Bellinger 525f318aef5SMarkus Elfring write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg), 52668ff9b9bSNicholas Bellinger GFP_KERNEL); 52768ff9b9bSNicholas Bellinger if (!write_sg) { 52868ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write sg\n"); 52968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 53068ff9b9bSNicholas Bellinger goto out; 53168ff9b9bSNicholas Bellinger } 532a1e1774cSMartin Svec sg_init_table(write_sg, cmd->t_data_nents); 53368ff9b9bSNicholas Bellinger /* 53468ff9b9bSNicholas Bellinger * Setup verify and write data payloads from total NumberLBAs. 53568ff9b9bSNicholas Bellinger */ 53668ff9b9bSNicholas Bellinger rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 53768ff9b9bSNicholas Bellinger cmd->data_length); 53868ff9b9bSNicholas Bellinger if (!rc) { 53968ff9b9bSNicholas Bellinger pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 54068ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 54168ff9b9bSNicholas Bellinger goto out; 54268ff9b9bSNicholas Bellinger } 54368ff9b9bSNicholas Bellinger /* 54468ff9b9bSNicholas Bellinger * Compare against SCSI READ payload against verify payload 54568ff9b9bSNicholas Bellinger */ 54668ff9b9bSNicholas Bellinger for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 54768ff9b9bSNicholas Bellinger addr = (unsigned char *)kmap_atomic(sg_page(sg)); 54868ff9b9bSNicholas Bellinger if (!addr) { 54968ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 55068ff9b9bSNicholas Bellinger goto out; 55168ff9b9bSNicholas Bellinger } 55268ff9b9bSNicholas Bellinger 55368ff9b9bSNicholas Bellinger len = min(sg->length, compare_len); 55468ff9b9bSNicholas Bellinger 55568ff9b9bSNicholas Bellinger if (memcmp(addr, buf + offset, len)) { 55668ff9b9bSNicholas Bellinger pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 55768ff9b9bSNicholas Bellinger addr, buf + offset); 55868ff9b9bSNicholas Bellinger kunmap_atomic(addr); 55968ff9b9bSNicholas Bellinger goto miscompare; 56068ff9b9bSNicholas Bellinger } 56168ff9b9bSNicholas Bellinger kunmap_atomic(addr); 56268ff9b9bSNicholas Bellinger 56368ff9b9bSNicholas Bellinger offset += len; 56468ff9b9bSNicholas Bellinger compare_len -= len; 56568ff9b9bSNicholas Bellinger if (!compare_len) 56668ff9b9bSNicholas Bellinger break; 56768ff9b9bSNicholas Bellinger } 56868ff9b9bSNicholas Bellinger 56968ff9b9bSNicholas Bellinger i = 0; 57068ff9b9bSNicholas Bellinger len = cmd->t_task_nolb * block_size; 57168ff9b9bSNicholas Bellinger sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 57268ff9b9bSNicholas Bellinger /* 57368ff9b9bSNicholas Bellinger * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 57468ff9b9bSNicholas Bellinger */ 57568ff9b9bSNicholas Bellinger while (len) { 57668ff9b9bSNicholas Bellinger sg_miter_next(&m); 57768ff9b9bSNicholas Bellinger 57868ff9b9bSNicholas Bellinger if (block_size < PAGE_SIZE) { 57968ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 580d94e5a61SJan Engelhardt m.piter.sg->offset + block_size); 58168ff9b9bSNicholas Bellinger } else { 58268ff9b9bSNicholas Bellinger sg_miter_next(&m); 58368ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 584d94e5a61SJan Engelhardt m.piter.sg->offset); 58568ff9b9bSNicholas Bellinger } 58668ff9b9bSNicholas Bellinger len -= block_size; 58768ff9b9bSNicholas Bellinger i++; 58868ff9b9bSNicholas Bellinger } 58968ff9b9bSNicholas Bellinger sg_miter_stop(&m); 59068ff9b9bSNicholas Bellinger /* 59168ff9b9bSNicholas Bellinger * Save the original SGL + nents values before updating to new 59268ff9b9bSNicholas Bellinger * assignments, to be released in transport_free_pages() -> 59368ff9b9bSNicholas Bellinger * transport_reset_sgl_orig() 59468ff9b9bSNicholas Bellinger */ 59568ff9b9bSNicholas Bellinger cmd->t_data_sg_orig = cmd->t_data_sg; 59668ff9b9bSNicholas Bellinger cmd->t_data_sg = write_sg; 59768ff9b9bSNicholas Bellinger cmd->t_data_nents_orig = cmd->t_data_nents; 59868ff9b9bSNicholas Bellinger cmd->t_data_nents = 1; 59968ff9b9bSNicholas Bellinger 60068d81f40SChristoph Hellwig cmd->sam_task_attr = TCM_HEAD_TAG; 60168ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_post; 60268ff9b9bSNicholas Bellinger /* 60368ff9b9bSNicholas Bellinger * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 60468ff9b9bSNicholas Bellinger * for submitting the adjusted SGL to write instance user-data. 60568ff9b9bSNicholas Bellinger */ 60668ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 60768ff9b9bSNicholas Bellinger 60868ff9b9bSNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 60968ff9b9bSNicholas Bellinger cmd->t_state = TRANSPORT_PROCESSING; 610fd5e64deSBart Van Assche cmd->transport_state |= CMD_T_ACTIVE | CMD_T_SENT; 61168ff9b9bSNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 61268ff9b9bSNicholas Bellinger 613dff0ca9eSNicholas Bellinger __target_execute_cmd(cmd, false); 61468ff9b9bSNicholas Bellinger 61568ff9b9bSNicholas Bellinger kfree(buf); 61668ff9b9bSNicholas Bellinger return ret; 61768ff9b9bSNicholas Bellinger 61868ff9b9bSNicholas Bellinger miscompare: 61968ff9b9bSNicholas Bellinger pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 62068ff9b9bSNicholas Bellinger dev->transport->name); 62168ff9b9bSNicholas Bellinger ret = TCM_MISCOMPARE_VERIFY; 62268ff9b9bSNicholas Bellinger out: 62368ff9b9bSNicholas Bellinger /* 62468ff9b9bSNicholas Bellinger * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 62568ff9b9bSNicholas Bellinger * sbc_compare_and_write() before the original READ I/O submission. 62668ff9b9bSNicholas Bellinger */ 62768ff9b9bSNicholas Bellinger up(&dev->caw_sem); 62868ff9b9bSNicholas Bellinger kfree(write_sg); 62968ff9b9bSNicholas Bellinger kfree(buf); 63068ff9b9bSNicholas Bellinger return ret; 63168ff9b9bSNicholas Bellinger } 63268ff9b9bSNicholas Bellinger 63368ff9b9bSNicholas Bellinger static sense_reason_t 63468ff9b9bSNicholas Bellinger sbc_compare_and_write(struct se_cmd *cmd) 63568ff9b9bSNicholas Bellinger { 6367a971b1bSChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 63768ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 63868ff9b9bSNicholas Bellinger sense_reason_t ret; 63968ff9b9bSNicholas Bellinger int rc; 64068ff9b9bSNicholas Bellinger /* 64168ff9b9bSNicholas Bellinger * Submit the READ first for COMPARE_AND_WRITE to perform the 64268ff9b9bSNicholas Bellinger * comparision using SGLs at cmd->t_bidi_data_sg.. 64368ff9b9bSNicholas Bellinger */ 64468ff9b9bSNicholas Bellinger rc = down_interruptible(&dev->caw_sem); 645ee7619f2SNicholas Bellinger if (rc != 0) { 64668ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 64768ff9b9bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 64868ff9b9bSNicholas Bellinger } 649b7191253SNicholas Bellinger /* 650b7191253SNicholas Bellinger * Reset cmd->data_length to individual block_size in order to not 651b7191253SNicholas Bellinger * confuse backend drivers that depend on this value matching the 652b7191253SNicholas Bellinger * size of the I/O being submitted. 653b7191253SNicholas Bellinger */ 654b7191253SNicholas Bellinger cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 65568ff9b9bSNicholas Bellinger 6567a971b1bSChristoph Hellwig ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 65768ff9b9bSNicholas Bellinger DMA_FROM_DEVICE); 65868ff9b9bSNicholas Bellinger if (ret) { 65968ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 66068ff9b9bSNicholas Bellinger up(&dev->caw_sem); 66168ff9b9bSNicholas Bellinger return ret; 66268ff9b9bSNicholas Bellinger } 66368ff9b9bSNicholas Bellinger /* 66468ff9b9bSNicholas Bellinger * Unlock of dev->caw_sem to occur in compare_and_write_callback() 66568ff9b9bSNicholas Bellinger * upon MISCOMPARE, or in compare_and_write_done() upon completion 66668ff9b9bSNicholas Bellinger * of WRITE instance user-data. 66768ff9b9bSNicholas Bellinger */ 66868ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 66968ff9b9bSNicholas Bellinger } 67068ff9b9bSNicholas Bellinger 67119f9361aSSagi Grimberg static int 67238b57f82SNicholas Bellinger sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 67319f9361aSSagi Grimberg bool is_write, struct se_cmd *cmd) 67419f9361aSSagi Grimberg { 67519f9361aSSagi Grimberg if (is_write) { 67638b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 67738b57f82SNicholas Bellinger protect ? TARGET_PROT_DOUT_PASS : 67819f9361aSSagi Grimberg TARGET_PROT_DOUT_INSERT; 67919f9361aSSagi Grimberg switch (protect) { 68019f9361aSSagi Grimberg case 0x0: 68119f9361aSSagi Grimberg case 0x3: 68219f9361aSSagi Grimberg cmd->prot_checks = 0; 68319f9361aSSagi Grimberg break; 68419f9361aSSagi Grimberg case 0x1: 68519f9361aSSagi Grimberg case 0x5: 68619f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 68719f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 68819f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 68919f9361aSSagi Grimberg break; 69019f9361aSSagi Grimberg case 0x2: 69119f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 69219f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 69319f9361aSSagi Grimberg break; 69419f9361aSSagi Grimberg case 0x4: 69519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 69619f9361aSSagi Grimberg break; 69719f9361aSSagi Grimberg default: 69819f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 69919f9361aSSagi Grimberg return -EINVAL; 70019f9361aSSagi Grimberg } 70119f9361aSSagi Grimberg } else { 70238b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 70338b57f82SNicholas Bellinger protect ? TARGET_PROT_DIN_PASS : 70419f9361aSSagi Grimberg TARGET_PROT_DIN_STRIP; 70519f9361aSSagi Grimberg switch (protect) { 70619f9361aSSagi Grimberg case 0x0: 70719f9361aSSagi Grimberg case 0x1: 70819f9361aSSagi Grimberg case 0x5: 70919f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 71019f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 71119f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 71219f9361aSSagi Grimberg break; 71319f9361aSSagi Grimberg case 0x2: 71419f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 71519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 71619f9361aSSagi Grimberg break; 71719f9361aSSagi Grimberg case 0x3: 71819f9361aSSagi Grimberg cmd->prot_checks = 0; 71919f9361aSSagi Grimberg break; 72019f9361aSSagi Grimberg case 0x4: 72119f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 72219f9361aSSagi Grimberg break; 72319f9361aSSagi Grimberg default: 72419f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 72519f9361aSSagi Grimberg return -EINVAL; 72619f9361aSSagi Grimberg } 72719f9361aSSagi Grimberg } 72819f9361aSSagi Grimberg 72919f9361aSSagi Grimberg return 0; 73019f9361aSSagi Grimberg } 73119f9361aSSagi Grimberg 732f7b7c06fSNicholas Bellinger static sense_reason_t 733499bf77bSNicholas Bellinger sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 73419f9361aSSagi Grimberg u32 sectors, bool is_write) 735499bf77bSNicholas Bellinger { 73619f9361aSSagi Grimberg u8 protect = cdb[1] >> 5; 73738b57f82SNicholas Bellinger int sp_ops = cmd->se_sess->sup_prot_ops; 73838b57f82SNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 73938b57f82SNicholas Bellinger bool fabric_prot = false; 74019f9361aSSagi Grimberg 741f7b7c06fSNicholas Bellinger if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 74238b57f82SNicholas Bellinger if (unlikely(protect && 74338b57f82SNicholas Bellinger !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 74438b57f82SNicholas Bellinger pr_err("CDB contains protect bit, but device + fabric does" 74538b57f82SNicholas Bellinger " not advertise PROTECT=1 feature bit\n"); 746f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 747f7b7c06fSNicholas Bellinger } 748f7b7c06fSNicholas Bellinger if (cmd->prot_pto) 749f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 750f7b7c06fSNicholas Bellinger } 751499bf77bSNicholas Bellinger 752499bf77bSNicholas Bellinger switch (dev->dev_attrib.pi_prot_type) { 753499bf77bSNicholas Bellinger case TARGET_DIF_TYPE3_PROT: 754499bf77bSNicholas Bellinger cmd->reftag_seed = 0xffffffff; 755499bf77bSNicholas Bellinger break; 756499bf77bSNicholas Bellinger case TARGET_DIF_TYPE2_PROT: 75719f9361aSSagi Grimberg if (protect) 758f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 759499bf77bSNicholas Bellinger 760499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 761499bf77bSNicholas Bellinger break; 762499bf77bSNicholas Bellinger case TARGET_DIF_TYPE1_PROT: 763499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 764499bf77bSNicholas Bellinger break; 765499bf77bSNicholas Bellinger case TARGET_DIF_TYPE0_PROT: 76638b57f82SNicholas Bellinger /* 76738b57f82SNicholas Bellinger * See if the fabric supports T10-PI, and the session has been 76838b57f82SNicholas Bellinger * configured to allow export PROTECT=1 feature bit with backend 76938b57f82SNicholas Bellinger * devices that don't support T10-PI. 77038b57f82SNicholas Bellinger */ 77138b57f82SNicholas Bellinger fabric_prot = is_write ? 77238b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 77338b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 77438b57f82SNicholas Bellinger 77538b57f82SNicholas Bellinger if (fabric_prot && cmd->se_sess->sess_prot_type) { 77638b57f82SNicholas Bellinger pi_prot_type = cmd->se_sess->sess_prot_type; 77738b57f82SNicholas Bellinger break; 77838b57f82SNicholas Bellinger } 779cceca4a6SNicholas Bellinger if (!protect) 780f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 78138b57f82SNicholas Bellinger /* Fallthrough */ 782499bf77bSNicholas Bellinger default: 783cceca4a6SNicholas Bellinger pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 784cceca4a6SNicholas Bellinger "PROTECT: 0x%02x\n", cdb[0], protect); 785cceca4a6SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 786499bf77bSNicholas Bellinger } 787499bf77bSNicholas Bellinger 78838b57f82SNicholas Bellinger if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 789f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 79019f9361aSSagi Grimberg 79138b57f82SNicholas Bellinger cmd->prot_type = pi_prot_type; 792499bf77bSNicholas Bellinger cmd->prot_length = dev->prot_length * sectors; 793e2a4f55cSSagi Grimberg 794e2a4f55cSSagi Grimberg /** 795e2a4f55cSSagi Grimberg * In case protection information exists over the wire 796e2a4f55cSSagi Grimberg * we modify command data length to describe pure data. 797e2a4f55cSSagi Grimberg * The actual transfer length is data length + protection 798e2a4f55cSSagi Grimberg * length 799e2a4f55cSSagi Grimberg **/ 800e2a4f55cSSagi Grimberg if (protect) 801e2a4f55cSSagi Grimberg cmd->data_length = sectors * dev->dev_attrib.block_size; 802e2a4f55cSSagi Grimberg 803e2a4f55cSSagi Grimberg pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 804e2a4f55cSSagi Grimberg "prot_op=%d prot_checks=%d\n", 805e2a4f55cSSagi Grimberg __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 80603abad9eSSagi Grimberg cmd->prot_op, cmd->prot_checks); 807499bf77bSNicholas Bellinger 808f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 809499bf77bSNicholas Bellinger } 810499bf77bSNicholas Bellinger 811fde9f50fSNicholas Bellinger static int 812fde9f50fSNicholas Bellinger sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 813fde9f50fSNicholas Bellinger { 814fde9f50fSNicholas Bellinger if (cdb[1] & 0x10) { 815814e5b45SChristoph Hellwig /* see explanation in spc_emulate_modesense */ 816814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 817fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with DPO bit set, but device" 818fde9f50fSNicholas Bellinger " does not advertise support for DPO\n", cdb[0]); 819fde9f50fSNicholas Bellinger return -EINVAL; 820fde9f50fSNicholas Bellinger } 821fde9f50fSNicholas Bellinger } 822fde9f50fSNicholas Bellinger if (cdb[1] & 0x8) { 823814e5b45SChristoph Hellwig if (!target_check_fua(dev)) { 824fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with FUA bit set, but device" 825fde9f50fSNicholas Bellinger " does not advertise support for FUA write\n", 826fde9f50fSNicholas Bellinger cdb[0]); 827fde9f50fSNicholas Bellinger return -EINVAL; 828fde9f50fSNicholas Bellinger } 829fde9f50fSNicholas Bellinger cmd->se_cmd_flags |= SCF_FUA; 830fde9f50fSNicholas Bellinger } 831fde9f50fSNicholas Bellinger return 0; 832d6e0175cSChristoph Hellwig } 833d6e0175cSChristoph Hellwig 8340e2eb7d1SBart Van Assche /** 8350e2eb7d1SBart Van Assche * sbc_parse_verify - parse VERIFY, VERIFY_16 and WRITE VERIFY commands 8360e2eb7d1SBart Van Assche * @cmd: (in) structure that describes the SCSI command to be parsed. 8370e2eb7d1SBart Van Assche * @sectors: (out) Number of logical blocks on the storage medium that will be 8380e2eb7d1SBart Van Assche * affected by the SCSI command. 8390e2eb7d1SBart Van Assche * @bufflen: (out) Expected length of the SCSI Data-Out buffer. 8400e2eb7d1SBart Van Assche */ 8410e2eb7d1SBart Van Assche static sense_reason_t sbc_parse_verify(struct se_cmd *cmd, int *sectors, 8420e2eb7d1SBart Van Assche u32 *bufflen) 8430e2eb7d1SBart Van Assche { 8440e2eb7d1SBart Van Assche struct se_device *dev = cmd->se_dev; 8450e2eb7d1SBart Van Assche u8 *cdb = cmd->t_task_cdb; 8460e2eb7d1SBart Van Assche u8 bytchk = (cdb[1] >> 1) & 3; 8470e2eb7d1SBart Van Assche sense_reason_t ret; 8480e2eb7d1SBart Van Assche 8490e2eb7d1SBart Van Assche switch (cdb[0]) { 8500e2eb7d1SBart Van Assche case VERIFY: 8510e2eb7d1SBart Van Assche case WRITE_VERIFY: 8520e2eb7d1SBart Van Assche *sectors = transport_get_sectors_10(cdb); 8530e2eb7d1SBart Van Assche cmd->t_task_lba = transport_lba_32(cdb); 8540e2eb7d1SBart Van Assche break; 8550e2eb7d1SBart Van Assche case VERIFY_16: 856c2d26f18SBryant G. Ly case WRITE_VERIFY_16: 8570e2eb7d1SBart Van Assche *sectors = transport_get_sectors_16(cdb); 8580e2eb7d1SBart Van Assche cmd->t_task_lba = transport_lba_64(cdb); 8590e2eb7d1SBart Van Assche break; 8600e2eb7d1SBart Van Assche default: 8610e2eb7d1SBart Van Assche WARN_ON_ONCE(true); 8620e2eb7d1SBart Van Assche return TCM_UNSUPPORTED_SCSI_OPCODE; 8630e2eb7d1SBart Van Assche } 8640e2eb7d1SBart Van Assche 8650e2eb7d1SBart Van Assche if (sbc_check_dpofua(dev, cmd, cdb)) 8660e2eb7d1SBart Van Assche return TCM_INVALID_CDB_FIELD; 8670e2eb7d1SBart Van Assche 8680e2eb7d1SBart Van Assche ret = sbc_check_prot(dev, cmd, cdb, *sectors, true); 8690e2eb7d1SBart Van Assche if (ret) 8700e2eb7d1SBart Van Assche return ret; 8710e2eb7d1SBart Van Assche 8720e2eb7d1SBart Van Assche switch (bytchk) { 8730e2eb7d1SBart Van Assche case 0: 8740e2eb7d1SBart Van Assche *bufflen = 0; 8750e2eb7d1SBart Van Assche break; 8760e2eb7d1SBart Van Assche case 1: 8770e2eb7d1SBart Van Assche *bufflen = sbc_get_size(cmd, *sectors); 8780e2eb7d1SBart Van Assche cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 8790e2eb7d1SBart Van Assche break; 8800e2eb7d1SBart Van Assche default: 8810e2eb7d1SBart Van Assche pr_err("Unsupported BYTCHK value %d for SCSI opcode %#x\n", 8820e2eb7d1SBart Van Assche bytchk, cdb[0]); 8830e2eb7d1SBart Van Assche return TCM_INVALID_CDB_FIELD; 8840e2eb7d1SBart Van Assche } 8850e2eb7d1SBart Van Assche return TCM_NO_SENSE; 8860e2eb7d1SBart Van Assche } 8870e2eb7d1SBart Van Assche 888de103c93SChristoph Hellwig sense_reason_t 889de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 890d6e0175cSChristoph Hellwig { 891d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 892d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 8931fd032eeSChristoph Hellwig unsigned int size; 894d6e0175cSChristoph Hellwig u32 sectors = 0; 895de103c93SChristoph Hellwig sense_reason_t ret; 896d6e0175cSChristoph Hellwig 8977a971b1bSChristoph Hellwig cmd->protocol_data = ops; 8987a971b1bSChristoph Hellwig 899d6e0175cSChristoph Hellwig switch (cdb[0]) { 900d6e0175cSChristoph Hellwig case READ_6: 901d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 902d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 903d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 904a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 905d6e0175cSChristoph Hellwig break; 906d6e0175cSChristoph Hellwig case READ_10: 907d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 908d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 909499bf77bSNicholas Bellinger 910fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 911fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 912fde9f50fSNicholas Bellinger 913f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 914f7b7c06fSNicholas Bellinger if (ret) 915f7b7c06fSNicholas Bellinger return ret; 916499bf77bSNicholas Bellinger 917d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 918a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 919d6e0175cSChristoph Hellwig break; 920d6e0175cSChristoph Hellwig case READ_12: 921d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 922d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 923499bf77bSNicholas Bellinger 924fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 925fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 926fde9f50fSNicholas Bellinger 927f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 928f7b7c06fSNicholas Bellinger if (ret) 929f7b7c06fSNicholas Bellinger return ret; 930499bf77bSNicholas Bellinger 931d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 932a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 933d6e0175cSChristoph Hellwig break; 934d6e0175cSChristoph Hellwig case READ_16: 935d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 936d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 937499bf77bSNicholas Bellinger 938fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 939fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 940fde9f50fSNicholas Bellinger 941f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 942f7b7c06fSNicholas Bellinger if (ret) 943f7b7c06fSNicholas Bellinger return ret; 944499bf77bSNicholas Bellinger 945d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 946a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 947d6e0175cSChristoph Hellwig break; 948d6e0175cSChristoph Hellwig case WRITE_6: 949d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 950d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 951d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 952a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 953d6e0175cSChristoph Hellwig break; 954d6e0175cSChristoph Hellwig case WRITE_10: 955d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 956d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 957499bf77bSNicholas Bellinger 958fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 959fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 960499bf77bSNicholas Bellinger 961f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 962f7b7c06fSNicholas Bellinger if (ret) 963f7b7c06fSNicholas Bellinger return ret; 964d6e0175cSChristoph Hellwig 965d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 966a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 967d6e0175cSChristoph Hellwig break; 9680e2eb7d1SBart Van Assche case WRITE_VERIFY: 969c2d26f18SBryant G. Ly case WRITE_VERIFY_16: 9700e2eb7d1SBart Van Assche ret = sbc_parse_verify(cmd, §ors, &size); 9710e2eb7d1SBart Van Assche if (ret) 9720e2eb7d1SBart Van Assche return ret; 9730e2eb7d1SBart Van Assche cmd->execute_cmd = sbc_execute_rw; 9740e2eb7d1SBart Van Assche goto check_lba; 975d6e0175cSChristoph Hellwig case WRITE_12: 976d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 977d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 978499bf77bSNicholas Bellinger 979fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 980fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 981499bf77bSNicholas Bellinger 982f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 983f7b7c06fSNicholas Bellinger if (ret) 984f7b7c06fSNicholas Bellinger return ret; 985d6e0175cSChristoph Hellwig 986d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 987a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 988d6e0175cSChristoph Hellwig break; 989d6e0175cSChristoph Hellwig case WRITE_16: 990d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 991d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 992499bf77bSNicholas Bellinger 993fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 994fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 995499bf77bSNicholas Bellinger 996f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 997f7b7c06fSNicholas Bellinger if (ret) 998f7b7c06fSNicholas Bellinger return ret; 999cd063befSNicholas Bellinger 1000d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1001d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 1002d6e0175cSChristoph Hellwig break; 1003d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 1004d6e0175cSChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 1005d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 1006d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1007d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1008d6e0175cSChristoph Hellwig 1009fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 1010fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 1011fde9f50fSNicholas Bellinger 1012d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 1013d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1014d6e0175cSChristoph Hellwig 1015d6e0175cSChristoph Hellwig /* 1016d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 1017d6e0175cSChristoph Hellwig */ 1018d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 1019d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 10200c2ad7d1SChristoph Hellwig break; 1021d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 1022d6e0175cSChristoph Hellwig { 1023d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 1024d6e0175cSChristoph Hellwig switch (service_action) { 1025d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 10266f974e8cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 1027de103c93SChristoph Hellwig 1028fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 1029fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 10306f974e8cSChristoph Hellwig /* 1031d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 1032d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 1033d6e0175cSChristoph Hellwig */ 1034d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 1035de103c93SChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 1036d6e0175cSChristoph Hellwig 1037d6e0175cSChristoph Hellwig /* 10381fd032eeSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 1039d6e0175cSChristoph Hellwig * completion. 1040d6e0175cSChristoph Hellwig */ 1041de103c93SChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 10426f974e8cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 1043d6e0175cSChristoph Hellwig break; 1044d6e0175cSChristoph Hellwig case WRITE_SAME_32: 1045d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 1046d6e0175cSChristoph Hellwig if (!sectors) { 1047d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 1048d6e0175cSChristoph Hellwig " supported\n"); 1049d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1050d6e0175cSChristoph Hellwig } 1051d6e0175cSChristoph Hellwig 1052d6e0175cSChristoph Hellwig size = sbc_get_size(cmd, 1); 1053d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 1054d6e0175cSChristoph Hellwig 1055d6e0175cSChristoph Hellwig ret = sbc_setup_write_same(cmd, &cdb[10], ops); 1056d6e0175cSChristoph Hellwig if (ret) 10571fd032eeSChristoph Hellwig return ret; 1058d6e0175cSChristoph Hellwig break; 1059d6e0175cSChristoph Hellwig default: 1060d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 1061d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 1062de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 1063d6e0175cSChristoph Hellwig } 1064d6e0175cSChristoph Hellwig break; 1065d6e0175cSChristoph Hellwig } 106668ff9b9bSNicholas Bellinger case COMPARE_AND_WRITE: 106768ff9b9bSNicholas Bellinger sectors = cdb[13]; 106868ff9b9bSNicholas Bellinger /* 106968ff9b9bSNicholas Bellinger * Currently enforce COMPARE_AND_WRITE for a single sector 107068ff9b9bSNicholas Bellinger */ 107168ff9b9bSNicholas Bellinger if (sectors > 1) { 107268ff9b9bSNicholas Bellinger pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 107368ff9b9bSNicholas Bellinger " than 1\n", sectors); 107468ff9b9bSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 107568ff9b9bSNicholas Bellinger } 1076ab81a5e0SDavid Disseldorp if (sbc_check_dpofua(dev, cmd, cdb)) 1077ab81a5e0SDavid Disseldorp return TCM_INVALID_CDB_FIELD; 1078ab81a5e0SDavid Disseldorp 107968ff9b9bSNicholas Bellinger /* 108068ff9b9bSNicholas Bellinger * Double size because we have two buffers, note that 108168ff9b9bSNicholas Bellinger * zero is not an error.. 108268ff9b9bSNicholas Bellinger */ 108368ff9b9bSNicholas Bellinger size = 2 * sbc_get_size(cmd, sectors); 108468ff9b9bSNicholas Bellinger cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 108568ff9b9bSNicholas Bellinger cmd->t_task_nolb = sectors; 108668ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 108768ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_compare_and_write; 108868ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_callback; 108968ff9b9bSNicholas Bellinger break; 1090d6e0175cSChristoph Hellwig case READ_CAPACITY: 10911fd032eeSChristoph Hellwig size = READ_CAP_LEN; 10921fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 1093d6e0175cSChristoph Hellwig break; 1094eb846d9fSHannes Reinecke case SERVICE_ACTION_IN_16: 1095d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 1096d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 10971fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 1098d6e0175cSChristoph Hellwig break; 1099c66094bfSHannes Reinecke case SAI_REPORT_REFERRALS: 1100c66094bfSHannes Reinecke cmd->execute_cmd = target_emulate_report_referrals; 1101c66094bfSHannes Reinecke break; 1102d6e0175cSChristoph Hellwig default: 1103d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 1104d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 1105de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1106d6e0175cSChristoph Hellwig } 11071fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 1108d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 1109d6e0175cSChristoph Hellwig break; 1110d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 1111d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 1112d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 1113d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1114d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 1115d6e0175cSChristoph Hellwig } else { 1116d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1117d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 1118d6e0175cSChristoph Hellwig } 11196ef31dc7SChristophe Vu-Brugier if (ops->execute_sync_cache) { 1120ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 11216ef31dc7SChristophe Vu-Brugier goto check_lba; 11226ef31dc7SChristophe Vu-Brugier } 11236ef31dc7SChristophe Vu-Brugier size = 0; 11246ef31dc7SChristophe Vu-Brugier cmd->execute_cmd = sbc_emulate_noop; 1125d6e0175cSChristoph Hellwig break; 1126d6e0175cSChristoph Hellwig case UNMAP: 112714150a6bSChristoph Hellwig if (!ops->execute_unmap) 1128de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 112914150a6bSChristoph Hellwig 113061fdb4acSNicholas Bellinger if (!dev->dev_attrib.emulate_tpu) { 113161fdb4acSNicholas Bellinger pr_err("Got UNMAP, but backend device has" 113261fdb4acSNicholas Bellinger " emulate_tpu disabled\n"); 113361fdb4acSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 113461fdb4acSNicholas Bellinger } 11351fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 113662e46942SChristoph Hellwig cmd->execute_cmd = sbc_execute_unmap; 1137d6e0175cSChristoph Hellwig break; 1138d6e0175cSChristoph Hellwig case WRITE_SAME_16: 1139d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1140d6e0175cSChristoph Hellwig if (!sectors) { 1141d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1142de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1143d6e0175cSChristoph Hellwig } 1144d6e0175cSChristoph Hellwig 11451fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1146d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1147d6e0175cSChristoph Hellwig 1148cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 11496b64e1feSDan Carpenter if (ret) 1150cd063befSNicholas Bellinger return ret; 1151d6e0175cSChristoph Hellwig break; 1152d6e0175cSChristoph Hellwig case WRITE_SAME: 1153d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1154d6e0175cSChristoph Hellwig if (!sectors) { 1155d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1156de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1157d6e0175cSChristoph Hellwig } 1158d6e0175cSChristoph Hellwig 11591fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1160d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1161d6e0175cSChristoph Hellwig 1162d6e0175cSChristoph Hellwig /* 1163d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1164d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 1165d6e0175cSChristoph Hellwig */ 1166cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 11676b64e1feSDan Carpenter if (ret) 1168cd063befSNicholas Bellinger return ret; 1169d6e0175cSChristoph Hellwig break; 1170d6e0175cSChristoph Hellwig case VERIFY: 117113603685SMax Lohrmann case VERIFY_16: 11720e2eb7d1SBart Van Assche ret = sbc_parse_verify(cmd, §ors, &size); 11730e2eb7d1SBart Van Assche if (ret) 11740e2eb7d1SBart Van Assche return ret; 11751920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 1176c52716deSChristophe Vu-Brugier goto check_lba; 11771a1ff38cSBernhard Kohl case REZERO_UNIT: 11781a1ff38cSBernhard Kohl case SEEK_6: 11791a1ff38cSBernhard Kohl case SEEK_10: 11801a1ff38cSBernhard Kohl /* 11811a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 11821a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 11831a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 11841a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 11851a1ff38cSBernhard Kohl */ 11861a1ff38cSBernhard Kohl size = 0; 11871a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 11881a1ff38cSBernhard Kohl break; 118945182ed5SBrian Bunker case START_STOP: 119045182ed5SBrian Bunker size = 0; 119145182ed5SBrian Bunker cmd->execute_cmd = sbc_emulate_startstop; 119245182ed5SBrian Bunker break; 1193d6e0175cSChristoph Hellwig default: 11941fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 1195d6e0175cSChristoph Hellwig if (ret) 1196d6e0175cSChristoph Hellwig return ret; 1197d6e0175cSChristoph Hellwig } 1198d6e0175cSChristoph Hellwig 1199d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 120020959c4bSAndy Grover if (!cmd->execute_cmd) 1201de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 1202d6e0175cSChristoph Hellwig 1203d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 12041fd032eeSChristoph Hellwig unsigned long long end_lba; 12056ef31dc7SChristophe Vu-Brugier check_lba: 12061fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 1207aa179935SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1208aa179935SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 12091fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 12101fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 12111fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 121209ceadc7SRoland Dreier return TCM_ADDRESS_OUT_OF_RANGE; 1213d6e0175cSChristoph Hellwig } 1214d6e0175cSChristoph Hellwig 121568ff9b9bSNicholas Bellinger if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 12161fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 12171fd032eeSChristoph Hellwig } 12181fd032eeSChristoph Hellwig 1219de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 1220d6e0175cSChristoph Hellwig } 1221d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 12226f23ac8aSChristoph Hellwig 12236f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 12246f23ac8aSChristoph Hellwig { 12256f23ac8aSChristoph Hellwig return TYPE_DISK; 12266f23ac8aSChristoph Hellwig } 12276f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 122886d71829SAsias He 122962e46942SChristoph Hellwig static sense_reason_t 123062e46942SChristoph Hellwig sbc_execute_unmap(struct se_cmd *cmd) 123186d71829SAsias He { 123262e46942SChristoph Hellwig struct sbc_ops *ops = cmd->protocol_data; 123386d71829SAsias He struct se_device *dev = cmd->se_dev; 123486d71829SAsias He unsigned char *buf, *ptr = NULL; 123586d71829SAsias He sector_t lba; 123686d71829SAsias He int size; 123786d71829SAsias He u32 range; 123886d71829SAsias He sense_reason_t ret = 0; 123986d71829SAsias He int dl, bd_dl; 124086d71829SAsias He 124186d71829SAsias He /* We never set ANC_SUP */ 124286d71829SAsias He if (cmd->t_task_cdb[1]) 124386d71829SAsias He return TCM_INVALID_CDB_FIELD; 124486d71829SAsias He 124586d71829SAsias He if (cmd->data_length == 0) { 124686d71829SAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 124786d71829SAsias He return 0; 124886d71829SAsias He } 124986d71829SAsias He 125086d71829SAsias He if (cmd->data_length < 8) { 125186d71829SAsias He pr_warn("UNMAP parameter list length %u too small\n", 125286d71829SAsias He cmd->data_length); 125386d71829SAsias He return TCM_PARAMETER_LIST_LENGTH_ERROR; 125486d71829SAsias He } 125586d71829SAsias He 125686d71829SAsias He buf = transport_kmap_data_sg(cmd); 125786d71829SAsias He if (!buf) 125886d71829SAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 125986d71829SAsias He 126086d71829SAsias He dl = get_unaligned_be16(&buf[0]); 126186d71829SAsias He bd_dl = get_unaligned_be16(&buf[2]); 126286d71829SAsias He 126386d71829SAsias He size = cmd->data_length - 8; 126486d71829SAsias He if (bd_dl > size) 126586d71829SAsias He pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 126686d71829SAsias He cmd->data_length, bd_dl); 126786d71829SAsias He else 126886d71829SAsias He size = bd_dl; 126986d71829SAsias He 127086d71829SAsias He if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 127186d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 127286d71829SAsias He goto err; 127386d71829SAsias He } 127486d71829SAsias He 127586d71829SAsias He /* First UNMAP block descriptor starts at 8 byte offset */ 127686d71829SAsias He ptr = &buf[8]; 127786d71829SAsias He pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 127886d71829SAsias He " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 127986d71829SAsias He 128086d71829SAsias He while (size >= 16) { 128186d71829SAsias He lba = get_unaligned_be64(&ptr[0]); 128286d71829SAsias He range = get_unaligned_be32(&ptr[8]); 128386d71829SAsias He pr_debug("UNMAP: Using lba: %llu and range: %u\n", 128486d71829SAsias He (unsigned long long)lba, range); 128586d71829SAsias He 128686d71829SAsias He if (range > dev->dev_attrib.max_unmap_lba_count) { 128786d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 128886d71829SAsias He goto err; 128986d71829SAsias He } 129086d71829SAsias He 129186d71829SAsias He if (lba + range > dev->transport->get_blocks(dev) + 1) { 129286d71829SAsias He ret = TCM_ADDRESS_OUT_OF_RANGE; 129386d71829SAsias He goto err; 129486d71829SAsias He } 129586d71829SAsias He 129662e46942SChristoph Hellwig ret = ops->execute_unmap(cmd, lba, range); 129786d71829SAsias He if (ret) 129886d71829SAsias He goto err; 129986d71829SAsias He 130086d71829SAsias He ptr += 16; 130186d71829SAsias He size -= 16; 130286d71829SAsias He } 130386d71829SAsias He 130486d71829SAsias He err: 130586d71829SAsias He transport_kunmap_data_sg(cmd); 130686d71829SAsias He if (!ret) 130786d71829SAsias He target_complete_cmd(cmd, GOOD); 130886d71829SAsias He return ret; 130986d71829SAsias He } 131041861fa8SNicholas Bellinger 131166a3d5bcSNicholas Bellinger void 131266a3d5bcSNicholas Bellinger sbc_dif_generate(struct se_cmd *cmd) 131366a3d5bcSNicholas Bellinger { 131466a3d5bcSNicholas Bellinger struct se_device *dev = cmd->se_dev; 1315fe052a18SSagi Grimberg struct t10_pi_tuple *sdt; 131618213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg, *psg; 131766a3d5bcSNicholas Bellinger sector_t sector = cmd->t_task_lba; 131866a3d5bcSNicholas Bellinger void *daddr, *paddr; 131966a3d5bcSNicholas Bellinger int i, j, offset = 0; 132018213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 132166a3d5bcSNicholas Bellinger 132218213afbSAkinobu Mita for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 132318213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 132466a3d5bcSNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 132566a3d5bcSNicholas Bellinger 132618213afbSAkinobu Mita for (j = 0; j < psg->length; 1327fe052a18SSagi Grimberg j += sizeof(*sdt)) { 132818213afbSAkinobu Mita __u16 crc; 132918213afbSAkinobu Mita unsigned int avail; 133066a3d5bcSNicholas Bellinger 133118213afbSAkinobu Mita if (offset >= dsg->length) { 133218213afbSAkinobu Mita offset -= dsg->length; 133318213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 133418213afbSAkinobu Mita dsg = sg_next(dsg); 133518213afbSAkinobu Mita if (!dsg) { 133618213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 133718213afbSAkinobu Mita return; 133818213afbSAkinobu Mita } 133918213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 134066a3d5bcSNicholas Bellinger } 134166a3d5bcSNicholas Bellinger 134218213afbSAkinobu Mita sdt = paddr + j; 134318213afbSAkinobu Mita avail = min(block_size, dsg->length - offset); 134418213afbSAkinobu Mita crc = crc_t10dif(daddr + offset, avail); 134518213afbSAkinobu Mita if (avail < block_size) { 134618213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 134718213afbSAkinobu Mita dsg = sg_next(dsg); 134818213afbSAkinobu Mita if (!dsg) { 134918213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 135018213afbSAkinobu Mita return; 135118213afbSAkinobu Mita } 135218213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 135318213afbSAkinobu Mita offset = block_size - avail; 135418213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, offset); 135518213afbSAkinobu Mita } else { 135618213afbSAkinobu Mita offset += block_size; 135718213afbSAkinobu Mita } 135818213afbSAkinobu Mita 135918213afbSAkinobu Mita sdt->guard_tag = cpu_to_be16(crc); 1360823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 136166a3d5bcSNicholas Bellinger sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 136266a3d5bcSNicholas Bellinger sdt->app_tag = 0; 136366a3d5bcSNicholas Bellinger 13646ae50408SNicholas Bellinger pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 136566a3d5bcSNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 13666ae50408SNicholas Bellinger (cmd->data_direction == DMA_TO_DEVICE) ? 13676ae50408SNicholas Bellinger "WRITE" : "READ", (unsigned long long)sector, 13686ae50408SNicholas Bellinger sdt->guard_tag, sdt->app_tag, 13696ae50408SNicholas Bellinger be32_to_cpu(sdt->ref_tag)); 137066a3d5bcSNicholas Bellinger 137166a3d5bcSNicholas Bellinger sector++; 137266a3d5bcSNicholas Bellinger } 137366a3d5bcSNicholas Bellinger 137418213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 137518213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 137666a3d5bcSNicholas Bellinger } 137766a3d5bcSNicholas Bellinger } 137866a3d5bcSNicholas Bellinger 137941861fa8SNicholas Bellinger static sense_reason_t 1380fe052a18SSagi Grimberg sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, 138118213afbSAkinobu Mita __u16 crc, sector_t sector, unsigned int ei_lba) 138241861fa8SNicholas Bellinger { 138341861fa8SNicholas Bellinger __be16 csum; 138441861fa8SNicholas Bellinger 1385d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1386d7a463b0SNicholas Bellinger goto check_ref; 1387d7a463b0SNicholas Bellinger 138818213afbSAkinobu Mita csum = cpu_to_be16(crc); 138941861fa8SNicholas Bellinger 139041861fa8SNicholas Bellinger if (sdt->guard_tag != csum) { 139141861fa8SNicholas Bellinger pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 139241861fa8SNicholas Bellinger " csum 0x%04x\n", (unsigned long long)sector, 139341861fa8SNicholas Bellinger be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 139441861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 139541861fa8SNicholas Bellinger } 139641861fa8SNicholas Bellinger 1397d7a463b0SNicholas Bellinger check_ref: 1398d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1399d7a463b0SNicholas Bellinger return 0; 1400d7a463b0SNicholas Bellinger 1401823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 140241861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 140341861fa8SNicholas Bellinger pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 140441861fa8SNicholas Bellinger " sector MSB: 0x%08x\n", (unsigned long long)sector, 140541861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 140641861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 140741861fa8SNicholas Bellinger } 140841861fa8SNicholas Bellinger 1409823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 141041861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != ei_lba) { 141141861fa8SNicholas Bellinger pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 141241861fa8SNicholas Bellinger " ei_lba: 0x%08x\n", (unsigned long long)sector, 141341861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), ei_lba); 141441861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 141541861fa8SNicholas Bellinger } 141641861fa8SNicholas Bellinger 141741861fa8SNicholas Bellinger return 0; 141841861fa8SNicholas Bellinger } 141941861fa8SNicholas Bellinger 1420f75b6faeSSagi Grimberg void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 142141861fa8SNicholas Bellinger struct scatterlist *sg, int sg_off) 142241861fa8SNicholas Bellinger { 142341861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 142441861fa8SNicholas Bellinger struct scatterlist *psg; 142541861fa8SNicholas Bellinger void *paddr, *addr; 142641861fa8SNicholas Bellinger unsigned int i, len, left; 142710762e80SNicholas Bellinger unsigned int offset = sg_off; 142841861fa8SNicholas Bellinger 142938b57f82SNicholas Bellinger if (!sg) 143038b57f82SNicholas Bellinger return; 143138b57f82SNicholas Bellinger 143241861fa8SNicholas Bellinger left = sectors * dev->prot_length; 143341861fa8SNicholas Bellinger 143441861fa8SNicholas Bellinger for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 143516c0ae02SSagi Grimberg unsigned int psg_len, copied = 0; 143641861fa8SNicholas Bellinger 143716c0ae02SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 143816c0ae02SSagi Grimberg psg_len = min(left, psg->length); 143916c0ae02SSagi Grimberg while (psg_len) { 144016c0ae02SSagi Grimberg len = min(psg_len, sg->length - offset); 144116c0ae02SSagi Grimberg addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 144216c0ae02SSagi Grimberg 144316c0ae02SSagi Grimberg if (read) 144416c0ae02SSagi Grimberg memcpy(paddr + copied, addr, len); 144516c0ae02SSagi Grimberg else 144616c0ae02SSagi Grimberg memcpy(addr, paddr + copied, len); 144716c0ae02SSagi Grimberg 144816c0ae02SSagi Grimberg left -= len; 144916c0ae02SSagi Grimberg offset += len; 145016c0ae02SSagi Grimberg copied += len; 145116c0ae02SSagi Grimberg psg_len -= len; 145216c0ae02SSagi Grimberg 145357636388SAkinobu Mita kunmap_atomic(addr - sg->offset - offset); 145457636388SAkinobu Mita 1455d6a65fdcSSagi Grimberg if (offset >= sg->length) { 1456d6a65fdcSSagi Grimberg sg = sg_next(sg); 1457d6a65fdcSSagi Grimberg offset = 0; 1458d6a65fdcSSagi Grimberg } 145941861fa8SNicholas Bellinger } 146057636388SAkinobu Mita kunmap_atomic(paddr - psg->offset); 146116c0ae02SSagi Grimberg } 146241861fa8SNicholas Bellinger } 1463f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_copy_prot); 146441861fa8SNicholas Bellinger 146541861fa8SNicholas Bellinger sense_reason_t 1466f75b6faeSSagi Grimberg sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1467414e4627SSagi Grimberg unsigned int ei_lba, struct scatterlist *psg, int psg_off) 146841861fa8SNicholas Bellinger { 146941861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 1470fe052a18SSagi Grimberg struct t10_pi_tuple *sdt; 147118213afbSAkinobu Mita struct scatterlist *dsg = cmd->t_data_sg; 147241861fa8SNicholas Bellinger sector_t sector = start; 147341861fa8SNicholas Bellinger void *daddr, *paddr; 147418213afbSAkinobu Mita int i; 147541861fa8SNicholas Bellinger sense_reason_t rc; 147618213afbSAkinobu Mita int dsg_off = 0; 147718213afbSAkinobu Mita unsigned int block_size = dev->dev_attrib.block_size; 147841861fa8SNicholas Bellinger 147918213afbSAkinobu Mita for (; psg && sector < start + sectors; psg = sg_next(psg)) { 148018213afbSAkinobu Mita paddr = kmap_atomic(sg_page(psg)) + psg->offset; 148141861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 148241861fa8SNicholas Bellinger 148318213afbSAkinobu Mita for (i = psg_off; i < psg->length && 148418213afbSAkinobu Mita sector < start + sectors; 1485fe052a18SSagi Grimberg i += sizeof(*sdt)) { 148618213afbSAkinobu Mita __u16 crc; 148718213afbSAkinobu Mita unsigned int avail; 148841861fa8SNicholas Bellinger 148918213afbSAkinobu Mita if (dsg_off >= dsg->length) { 149018213afbSAkinobu Mita dsg_off -= dsg->length; 149118213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 149218213afbSAkinobu Mita dsg = sg_next(dsg); 149318213afbSAkinobu Mita if (!dsg) { 1494414e4627SSagi Grimberg kunmap_atomic(paddr - psg->offset); 149541861fa8SNicholas Bellinger return 0; 149641861fa8SNicholas Bellinger } 149741861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 149841861fa8SNicholas Bellinger } 149941861fa8SNicholas Bellinger 150018213afbSAkinobu Mita sdt = paddr + i; 150141861fa8SNicholas Bellinger 150241861fa8SNicholas Bellinger pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 150341861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 150441861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 150541861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 150641861fa8SNicholas Bellinger 150741861fa8SNicholas Bellinger if (sdt->app_tag == cpu_to_be16(0xffff)) { 150818213afbSAkinobu Mita dsg_off += block_size; 150918213afbSAkinobu Mita goto next; 151041861fa8SNicholas Bellinger } 151141861fa8SNicholas Bellinger 151218213afbSAkinobu Mita avail = min(block_size, dsg->length - dsg_off); 151318213afbSAkinobu Mita crc = crc_t10dif(daddr + dsg_off, avail); 151418213afbSAkinobu Mita if (avail < block_size) { 1515414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 151618213afbSAkinobu Mita dsg = sg_next(dsg); 151718213afbSAkinobu Mita if (!dsg) { 151818213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 151918213afbSAkinobu Mita return 0; 152018213afbSAkinobu Mita } 152118213afbSAkinobu Mita daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 152218213afbSAkinobu Mita dsg_off = block_size - avail; 152318213afbSAkinobu Mita crc = crc_t10dif_update(crc, daddr, dsg_off); 152418213afbSAkinobu Mita } else { 152518213afbSAkinobu Mita dsg_off += block_size; 152618213afbSAkinobu Mita } 152718213afbSAkinobu Mita 152818213afbSAkinobu Mita rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); 152941861fa8SNicholas Bellinger if (rc) { 153018213afbSAkinobu Mita kunmap_atomic(daddr - dsg->offset); 153118213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 153276736db3SSagi Grimberg cmd->bad_sector = sector; 153341861fa8SNicholas Bellinger return rc; 153441861fa8SNicholas Bellinger } 153518213afbSAkinobu Mita next: 153641861fa8SNicholas Bellinger sector++; 153741861fa8SNicholas Bellinger ei_lba++; 153841861fa8SNicholas Bellinger } 153941861fa8SNicholas Bellinger 154018213afbSAkinobu Mita psg_off = 0; 1541414e4627SSagi Grimberg kunmap_atomic(daddr - dsg->offset); 154218213afbSAkinobu Mita kunmap_atomic(paddr - psg->offset); 154341861fa8SNicholas Bellinger } 154441861fa8SNicholas Bellinger 154541861fa8SNicholas Bellinger return 0; 154641861fa8SNicholas Bellinger } 1547f75b6faeSSagi Grimberg EXPORT_SYMBOL(sbc_dif_verify); 1548