1d6e0175cSChristoph Hellwig /* 2d6e0175cSChristoph Hellwig * SCSI Block Commands (SBC) parsing and emulation. 3d6e0175cSChristoph Hellwig * 44c76251eSNicholas Bellinger * (c) Copyright 2002-2013 Datera, Inc. 5d6e0175cSChristoph Hellwig * 6d6e0175cSChristoph Hellwig * Nicholas A. Bellinger <nab@kernel.org> 7d6e0175cSChristoph Hellwig * 8d6e0175cSChristoph Hellwig * This program is free software; you can redistribute it and/or modify 9d6e0175cSChristoph Hellwig * it under the terms of the GNU General Public License as published by 10d6e0175cSChristoph Hellwig * the Free Software Foundation; either version 2 of the License, or 11d6e0175cSChristoph Hellwig * (at your option) any later version. 12d6e0175cSChristoph Hellwig * 13d6e0175cSChristoph Hellwig * This program is distributed in the hope that it will be useful, 14d6e0175cSChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 15d6e0175cSChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16d6e0175cSChristoph Hellwig * GNU General Public License for more details. 17d6e0175cSChristoph Hellwig * 18d6e0175cSChristoph Hellwig * You should have received a copy of the GNU General Public License 19d6e0175cSChristoph Hellwig * along with this program; if not, write to the Free Software 20d6e0175cSChristoph Hellwig * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 21d6e0175cSChristoph Hellwig */ 22d6e0175cSChristoph Hellwig 23d6e0175cSChristoph Hellwig #include <linux/kernel.h> 24d6e0175cSChristoph Hellwig #include <linux/module.h> 25d6e0175cSChristoph Hellwig #include <linux/ratelimit.h> 2641861fa8SNicholas Bellinger #include <linux/crc-t10dif.h> 27d6e0175cSChristoph Hellwig #include <asm/unaligned.h> 28d6e0175cSChristoph Hellwig #include <scsi/scsi.h> 2968ff9b9bSNicholas Bellinger #include <scsi/scsi_tcq.h> 30d6e0175cSChristoph Hellwig 31d6e0175cSChristoph Hellwig #include <target/target_core_base.h> 32d6e0175cSChristoph Hellwig #include <target/target_core_backend.h> 33d6e0175cSChristoph Hellwig #include <target/target_core_fabric.h> 34d6e0175cSChristoph Hellwig 35d6e0175cSChristoph Hellwig #include "target_core_internal.h" 36d6e0175cSChristoph Hellwig #include "target_core_ua.h" 37c66094bfSHannes Reinecke #include "target_core_alua.h" 38d6e0175cSChristoph Hellwig 39de103c93SChristoph Hellwig static sense_reason_t 40afd73f1bSNicholas Bellinger sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); 41afd73f1bSNicholas Bellinger 42afd73f1bSNicholas Bellinger static sense_reason_t 43de103c93SChristoph Hellwig sbc_emulate_readcapacity(struct se_cmd *cmd) 441fd032eeSChristoph Hellwig { 451fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 468dc8632aSRoland Dreier unsigned char *cdb = cmd->t_task_cdb; 471fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 48a50da144SPaolo Bonzini unsigned char *rbuf; 49a50da144SPaolo Bonzini unsigned char buf[8]; 501fd032eeSChristoph Hellwig u32 blocks; 511fd032eeSChristoph Hellwig 528dc8632aSRoland Dreier /* 538dc8632aSRoland Dreier * SBC-2 says: 548dc8632aSRoland Dreier * If the PMI bit is set to zero and the LOGICAL BLOCK 558dc8632aSRoland Dreier * ADDRESS field is not set to zero, the device server shall 568dc8632aSRoland Dreier * terminate the command with CHECK CONDITION status with 578dc8632aSRoland Dreier * the sense key set to ILLEGAL REQUEST and the additional 588dc8632aSRoland Dreier * sense code set to INVALID FIELD IN CDB. 598dc8632aSRoland Dreier * 608dc8632aSRoland Dreier * In SBC-3, these fields are obsolete, but some SCSI 618dc8632aSRoland Dreier * compliance tests actually check this, so we might as well 628dc8632aSRoland Dreier * follow SBC-2. 638dc8632aSRoland Dreier */ 648dc8632aSRoland Dreier if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) 658dc8632aSRoland Dreier return TCM_INVALID_CDB_FIELD; 668dc8632aSRoland Dreier 671fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 681fd032eeSChristoph Hellwig blocks = 0xffffffff; 691fd032eeSChristoph Hellwig else 701fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 711fd032eeSChristoph Hellwig 721fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 731fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 741fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 751fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 760fd97ccfSChristoph Hellwig buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 770fd97ccfSChristoph Hellwig buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 780fd97ccfSChristoph Hellwig buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 790fd97ccfSChristoph Hellwig buf[7] = dev->dev_attrib.block_size & 0xff; 801fd032eeSChristoph Hellwig 81a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 828b4b0dcbSNicholas Bellinger if (rbuf) { 83a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 841fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 858b4b0dcbSNicholas Bellinger } 861fd032eeSChristoph Hellwig 872426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 8); 881fd032eeSChristoph Hellwig return 0; 891fd032eeSChristoph Hellwig } 901fd032eeSChristoph Hellwig 91de103c93SChristoph Hellwig static sense_reason_t 92de103c93SChristoph Hellwig sbc_emulate_readcapacity_16(struct se_cmd *cmd) 931fd032eeSChristoph Hellwig { 941fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 952d335983SNicholas Bellinger struct se_session *sess = cmd->se_sess; 969ef5466eSNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 979ef5466eSNicholas Bellinger 98a50da144SPaolo Bonzini unsigned char *rbuf; 99a50da144SPaolo Bonzini unsigned char buf[32]; 1001fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 1011fd032eeSChristoph Hellwig 102a50da144SPaolo Bonzini memset(buf, 0, sizeof(buf)); 1031fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 1041fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 1051fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 1061fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 1071fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 1081fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 1091fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 1101fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 1110fd97ccfSChristoph Hellwig buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 1120fd97ccfSChristoph Hellwig buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 1130fd97ccfSChristoph Hellwig buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 1140fd97ccfSChristoph Hellwig buf[11] = dev->dev_attrib.block_size & 0xff; 11556dac14cSNicholas Bellinger /* 11656dac14cSNicholas Bellinger * Set P_TYPE and PROT_EN bits for DIF support 11756dac14cSNicholas Bellinger */ 1182d335983SNicholas Bellinger if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { 1199ef5466eSNicholas Bellinger /* 1209ef5466eSNicholas Bellinger * Only override a device's pi_prot_type if no T10-PI is 1219ef5466eSNicholas Bellinger * available, and sess_prot_type has been explicitly enabled. 1229ef5466eSNicholas Bellinger */ 1239ef5466eSNicholas Bellinger if (!pi_prot_type) 1249ef5466eSNicholas Bellinger pi_prot_type = sess->sess_prot_type; 1259ef5466eSNicholas Bellinger 1269ef5466eSNicholas Bellinger if (pi_prot_type) 1279ef5466eSNicholas Bellinger buf[12] = (pi_prot_type - 1) << 1 | 0x1; 1282d335983SNicholas Bellinger } 1297f7caf6aSAndy Grover 1307f7caf6aSAndy Grover if (dev->transport->get_lbppbe) 1317f7caf6aSAndy Grover buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; 1327f7caf6aSAndy Grover 1337f7caf6aSAndy Grover if (dev->transport->get_alignment_offset_lbas) { 1347f7caf6aSAndy Grover u16 lalba = dev->transport->get_alignment_offset_lbas(dev); 1357f7caf6aSAndy Grover buf[14] = (lalba >> 8) & 0x3f; 1367f7caf6aSAndy Grover buf[15] = lalba & 0xff; 1377f7caf6aSAndy Grover } 1387f7caf6aSAndy Grover 1391fd032eeSChristoph Hellwig /* 1401fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 1411fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 1421fd032eeSChristoph Hellwig */ 1430fd97ccfSChristoph Hellwig if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 1447f7caf6aSAndy Grover buf[14] |= 0x80; 1451fd032eeSChristoph Hellwig 146a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 1478b4b0dcbSNicholas Bellinger if (rbuf) { 148a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1491fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1508b4b0dcbSNicholas Bellinger } 1511fd032eeSChristoph Hellwig 1522426bd45SRoland Dreier target_complete_cmd_with_length(cmd, GOOD, 32); 1531fd032eeSChristoph Hellwig return 0; 1541fd032eeSChristoph Hellwig } 1551fd032eeSChristoph Hellwig 156972b29c8SRoland Dreier sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) 1571fd032eeSChristoph Hellwig { 1581fd032eeSChristoph Hellwig u32 num_blocks; 1591fd032eeSChristoph Hellwig 1601fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1611fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1621fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1631fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1641fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1651fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1661fd032eeSChristoph Hellwig 1671fd032eeSChristoph Hellwig /* 1681fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 1691fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 1701fd032eeSChristoph Hellwig */ 1716f974e8cSChristoph Hellwig if (num_blocks) 1726f974e8cSChristoph Hellwig return num_blocks; 1731fd032eeSChristoph Hellwig 1746f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 1756f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 1761fd032eeSChristoph Hellwig } 177972b29c8SRoland Dreier EXPORT_SYMBOL(sbc_get_write_same_sectors); 1781fd032eeSChristoph Hellwig 179de103c93SChristoph Hellwig static sense_reason_t 1801920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 1811a1ff38cSBernhard Kohl { 1821a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 1831a1ff38cSBernhard Kohl return 0; 1841a1ff38cSBernhard Kohl } 1851a1ff38cSBernhard Kohl 186d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 187d6e0175cSChristoph Hellwig { 1880fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 189d6e0175cSChristoph Hellwig } 190d6e0175cSChristoph Hellwig 191d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 192d6e0175cSChristoph Hellwig { 193d6e0175cSChristoph Hellwig /* 194d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 195d6e0175cSChristoph Hellwig * 196d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 197d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 198d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 199d6e0175cSChristoph Hellwig * written. 200d6e0175cSChristoph Hellwig */ 201d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 202d6e0175cSChristoph Hellwig } 203d6e0175cSChristoph Hellwig 204d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 205d6e0175cSChristoph Hellwig { 206d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 207d6e0175cSChristoph Hellwig } 208d6e0175cSChristoph Hellwig 209d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 210d6e0175cSChristoph Hellwig { 211d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 212d6e0175cSChristoph Hellwig } 213d6e0175cSChristoph Hellwig 214d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 215d6e0175cSChristoph Hellwig { 216d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 217d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 218d6e0175cSChristoph Hellwig } 219d6e0175cSChristoph Hellwig 220d6e0175cSChristoph Hellwig /* 221d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 222d6e0175cSChristoph Hellwig */ 223d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 224d6e0175cSChristoph Hellwig { 225d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 226d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 227d6e0175cSChristoph Hellwig 228d6e0175cSChristoph Hellwig } 229d6e0175cSChristoph Hellwig 230d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 231d6e0175cSChristoph Hellwig { 232d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 233d6e0175cSChristoph Hellwig } 234d6e0175cSChristoph Hellwig 235d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 236d6e0175cSChristoph Hellwig { 237d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 238d6e0175cSChristoph Hellwig } 239d6e0175cSChristoph Hellwig 240d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 241d6e0175cSChristoph Hellwig { 242d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 243d6e0175cSChristoph Hellwig 244d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 245d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 246d6e0175cSChristoph Hellwig 247d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 248d6e0175cSChristoph Hellwig } 249d6e0175cSChristoph Hellwig 250d6e0175cSChristoph Hellwig /* 251d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 252d6e0175cSChristoph Hellwig */ 253d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 254d6e0175cSChristoph Hellwig { 255d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 256d6e0175cSChristoph Hellwig 257d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 258d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 259d6e0175cSChristoph Hellwig 260d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 261d6e0175cSChristoph Hellwig } 262d6e0175cSChristoph Hellwig 263cd063befSNicholas Bellinger static sense_reason_t 264cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 265d6e0175cSChristoph Hellwig { 2668e575c50SNicholas Bellinger struct se_device *dev = cmd->se_dev; 2678e575c50SNicholas Bellinger sector_t end_lba = dev->transport->get_blocks(dev) + 1; 268972b29c8SRoland Dreier unsigned int sectors = sbc_get_write_same_sectors(cmd); 269afd73f1bSNicholas Bellinger sense_reason_t ret; 270773cbaf7SNicholas Bellinger 271d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 272d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 273d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 274d6e0175cSChristoph Hellwig " Emulation\n"); 275cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 276d6e0175cSChristoph Hellwig } 277773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 278773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 279773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 280773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 281773cbaf7SNicholas Bellinger } 2828e575c50SNicholas Bellinger /* 2838e575c50SNicholas Bellinger * Sanity check for LBA wrap and request past end of device. 2848e575c50SNicholas Bellinger */ 2858e575c50SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 2868e575c50SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 2878e575c50SNicholas Bellinger pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", 2888e575c50SNicholas Bellinger (unsigned long long)end_lba, cmd->t_task_lba, sectors); 2898e575c50SNicholas Bellinger return TCM_ADDRESS_OUT_OF_RANGE; 2908e575c50SNicholas Bellinger } 2918e575c50SNicholas Bellinger 2925cb770bfSRoland Dreier /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ 2935cb770bfSRoland Dreier if (flags[0] & 0x10) { 2945cb770bfSRoland Dreier pr_warn("WRITE SAME with ANCHOR not supported\n"); 2955cb770bfSRoland Dreier return TCM_INVALID_CDB_FIELD; 2965cb770bfSRoland Dreier } 297d6e0175cSChristoph Hellwig /* 298cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 299cd063befSNicholas Bellinger * translated into block discard requests within backend code. 300d6e0175cSChristoph Hellwig */ 301cd063befSNicholas Bellinger if (flags[0] & 0x08) { 302cd063befSNicholas Bellinger if (!ops->execute_write_same_unmap) 303cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 304d6e0175cSChristoph Hellwig 305d0a91295SNicholas Bellinger if (!dev->dev_attrib.emulate_tpws) { 306d0a91295SNicholas Bellinger pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" 307d0a91295SNicholas Bellinger " has emulate_tpws disabled\n"); 308d0a91295SNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 309d0a91295SNicholas Bellinger } 310cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same_unmap; 311cd063befSNicholas Bellinger return 0; 312cd063befSNicholas Bellinger } 313cd063befSNicholas Bellinger if (!ops->execute_write_same) 314cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 315cd063befSNicholas Bellinger 316afd73f1bSNicholas Bellinger ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); 317afd73f1bSNicholas Bellinger if (ret) 318afd73f1bSNicholas Bellinger return ret; 319afd73f1bSNicholas Bellinger 320cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 321d6e0175cSChristoph Hellwig return 0; 322d6e0175cSChristoph Hellwig } 323d6e0175cSChristoph Hellwig 324c8e63985SNicholas Bellinger static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success) 325d6e0175cSChristoph Hellwig { 326d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 327d6e0175cSChristoph Hellwig struct scatterlist *sg; 328d6e0175cSChristoph Hellwig unsigned int offset; 329a6b0133cSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 330a6b0133cSNicholas Bellinger int i, count; 331d6e0175cSChristoph Hellwig /* 332d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 333d6e0175cSChristoph Hellwig * 334d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 335d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 336d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 337d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 338d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 339d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 340d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 341d6e0175cSChristoph Hellwig */ 342d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 343d6e0175cSChristoph Hellwig if (!buf) { 344d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 345a6b0133cSNicholas Bellinger return TCM_OUT_OF_RESOURCES; 346d6e0175cSChristoph Hellwig } 347d6e0175cSChristoph Hellwig /* 348d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 349d6e0175cSChristoph Hellwig * into the locally allocated *buf 350d6e0175cSChristoph Hellwig */ 351d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 352d6e0175cSChristoph Hellwig cmd->t_data_nents, 353d6e0175cSChristoph Hellwig buf, 354d6e0175cSChristoph Hellwig cmd->data_length); 355d6e0175cSChristoph Hellwig 356d6e0175cSChristoph Hellwig /* 357d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 358d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 359d6e0175cSChristoph Hellwig */ 360d6e0175cSChristoph Hellwig 361d6e0175cSChristoph Hellwig offset = 0; 362d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 363d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 364a6b0133cSNicholas Bellinger if (!addr) { 365a6b0133cSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 366d6e0175cSChristoph Hellwig goto out; 367a6b0133cSNicholas Bellinger } 368d6e0175cSChristoph Hellwig 369d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 370d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 371d6e0175cSChristoph Hellwig 372d6e0175cSChristoph Hellwig offset += sg->length; 373d6e0175cSChristoph Hellwig kunmap_atomic(addr); 374d6e0175cSChristoph Hellwig } 375d6e0175cSChristoph Hellwig 376d6e0175cSChristoph Hellwig out: 377d6e0175cSChristoph Hellwig kfree(buf); 378a6b0133cSNicholas Bellinger return ret; 379d6e0175cSChristoph Hellwig } 380d6e0175cSChristoph Hellwig 381a82a9538SNicholas Bellinger static sense_reason_t 382a82a9538SNicholas Bellinger sbc_execute_rw(struct se_cmd *cmd) 383a82a9538SNicholas Bellinger { 384a82a9538SNicholas Bellinger return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, 385a82a9538SNicholas Bellinger cmd->data_direction); 386a82a9538SNicholas Bellinger } 387a82a9538SNicholas Bellinger 388c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success) 38968ff9b9bSNicholas Bellinger { 39068ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 39168ff9b9bSNicholas Bellinger 392d8855c15SNicholas Bellinger /* 393d8855c15SNicholas Bellinger * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through 394d8855c15SNicholas Bellinger * within target_complete_ok_work() if the command was successfully 395d8855c15SNicholas Bellinger * sent to the backend driver. 396d8855c15SNicholas Bellinger */ 397d8855c15SNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 398d8855c15SNicholas Bellinger if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) 39968ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; 400d8855c15SNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 401d8855c15SNicholas Bellinger 40268ff9b9bSNicholas Bellinger /* 40368ff9b9bSNicholas Bellinger * Unlock ->caw_sem originally obtained during sbc_compare_and_write() 40468ff9b9bSNicholas Bellinger * before the original READ I/O submission. 40568ff9b9bSNicholas Bellinger */ 40668ff9b9bSNicholas Bellinger up(&dev->caw_sem); 40768ff9b9bSNicholas Bellinger 40868ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 40968ff9b9bSNicholas Bellinger } 41068ff9b9bSNicholas Bellinger 411c8e63985SNicholas Bellinger static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success) 41268ff9b9bSNicholas Bellinger { 41368ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 41468ff9b9bSNicholas Bellinger struct scatterlist *write_sg = NULL, *sg; 415db60df88SNicholas Bellinger unsigned char *buf = NULL, *addr; 41668ff9b9bSNicholas Bellinger struct sg_mapping_iter m; 41768ff9b9bSNicholas Bellinger unsigned int offset = 0, len; 41868ff9b9bSNicholas Bellinger unsigned int nlbas = cmd->t_task_nolb; 41968ff9b9bSNicholas Bellinger unsigned int block_size = dev->dev_attrib.block_size; 42068ff9b9bSNicholas Bellinger unsigned int compare_len = (nlbas * block_size); 42168ff9b9bSNicholas Bellinger sense_reason_t ret = TCM_NO_SENSE; 42268ff9b9bSNicholas Bellinger int rc, i; 42368ff9b9bSNicholas Bellinger 424cf6d1f09SNicholas Bellinger /* 425cf6d1f09SNicholas Bellinger * Handle early failure in transport_generic_request_failure(), 426c8e63985SNicholas Bellinger * which will not have taken ->caw_sem yet.. 427cf6d1f09SNicholas Bellinger */ 428c8e63985SNicholas Bellinger if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) 429cf6d1f09SNicholas Bellinger return TCM_NO_SENSE; 430db60df88SNicholas Bellinger /* 431c8e63985SNicholas Bellinger * Handle special case for zero-length COMPARE_AND_WRITE 432c8e63985SNicholas Bellinger */ 433c8e63985SNicholas Bellinger if (!cmd->data_length) 434c8e63985SNicholas Bellinger goto out; 435c8e63985SNicholas Bellinger /* 436db60df88SNicholas Bellinger * Immediately exit + release dev->caw_sem if command has already 437db60df88SNicholas Bellinger * been failed with a non-zero SCSI status. 438db60df88SNicholas Bellinger */ 439db60df88SNicholas Bellinger if (cmd->scsi_status) { 440db60df88SNicholas Bellinger pr_err("compare_and_write_callback: non zero scsi_status:" 441db60df88SNicholas Bellinger " 0x%02x\n", cmd->scsi_status); 442db60df88SNicholas Bellinger goto out; 443db60df88SNicholas Bellinger } 444cf6d1f09SNicholas Bellinger 44568ff9b9bSNicholas Bellinger buf = kzalloc(cmd->data_length, GFP_KERNEL); 44668ff9b9bSNicholas Bellinger if (!buf) { 44768ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write buf\n"); 448a2890087SNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 449a2890087SNicholas Bellinger goto out; 45068ff9b9bSNicholas Bellinger } 45168ff9b9bSNicholas Bellinger 452a1e1774cSMartin Svec write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, 45368ff9b9bSNicholas Bellinger GFP_KERNEL); 45468ff9b9bSNicholas Bellinger if (!write_sg) { 45568ff9b9bSNicholas Bellinger pr_err("Unable to allocate compare_and_write sg\n"); 45668ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 45768ff9b9bSNicholas Bellinger goto out; 45868ff9b9bSNicholas Bellinger } 459a1e1774cSMartin Svec sg_init_table(write_sg, cmd->t_data_nents); 46068ff9b9bSNicholas Bellinger /* 46168ff9b9bSNicholas Bellinger * Setup verify and write data payloads from total NumberLBAs. 46268ff9b9bSNicholas Bellinger */ 46368ff9b9bSNicholas Bellinger rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, 46468ff9b9bSNicholas Bellinger cmd->data_length); 46568ff9b9bSNicholas Bellinger if (!rc) { 46668ff9b9bSNicholas Bellinger pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); 46768ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 46868ff9b9bSNicholas Bellinger goto out; 46968ff9b9bSNicholas Bellinger } 47068ff9b9bSNicholas Bellinger /* 47168ff9b9bSNicholas Bellinger * Compare against SCSI READ payload against verify payload 47268ff9b9bSNicholas Bellinger */ 47368ff9b9bSNicholas Bellinger for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { 47468ff9b9bSNicholas Bellinger addr = (unsigned char *)kmap_atomic(sg_page(sg)); 47568ff9b9bSNicholas Bellinger if (!addr) { 47668ff9b9bSNicholas Bellinger ret = TCM_OUT_OF_RESOURCES; 47768ff9b9bSNicholas Bellinger goto out; 47868ff9b9bSNicholas Bellinger } 47968ff9b9bSNicholas Bellinger 48068ff9b9bSNicholas Bellinger len = min(sg->length, compare_len); 48168ff9b9bSNicholas Bellinger 48268ff9b9bSNicholas Bellinger if (memcmp(addr, buf + offset, len)) { 48368ff9b9bSNicholas Bellinger pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", 48468ff9b9bSNicholas Bellinger addr, buf + offset); 48568ff9b9bSNicholas Bellinger kunmap_atomic(addr); 48668ff9b9bSNicholas Bellinger goto miscompare; 48768ff9b9bSNicholas Bellinger } 48868ff9b9bSNicholas Bellinger kunmap_atomic(addr); 48968ff9b9bSNicholas Bellinger 49068ff9b9bSNicholas Bellinger offset += len; 49168ff9b9bSNicholas Bellinger compare_len -= len; 49268ff9b9bSNicholas Bellinger if (!compare_len) 49368ff9b9bSNicholas Bellinger break; 49468ff9b9bSNicholas Bellinger } 49568ff9b9bSNicholas Bellinger 49668ff9b9bSNicholas Bellinger i = 0; 49768ff9b9bSNicholas Bellinger len = cmd->t_task_nolb * block_size; 49868ff9b9bSNicholas Bellinger sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); 49968ff9b9bSNicholas Bellinger /* 50068ff9b9bSNicholas Bellinger * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. 50168ff9b9bSNicholas Bellinger */ 50268ff9b9bSNicholas Bellinger while (len) { 50368ff9b9bSNicholas Bellinger sg_miter_next(&m); 50468ff9b9bSNicholas Bellinger 50568ff9b9bSNicholas Bellinger if (block_size < PAGE_SIZE) { 50668ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 50768ff9b9bSNicholas Bellinger block_size); 50868ff9b9bSNicholas Bellinger } else { 50968ff9b9bSNicholas Bellinger sg_miter_next(&m); 51068ff9b9bSNicholas Bellinger sg_set_page(&write_sg[i], m.page, block_size, 51168ff9b9bSNicholas Bellinger 0); 51268ff9b9bSNicholas Bellinger } 51368ff9b9bSNicholas Bellinger len -= block_size; 51468ff9b9bSNicholas Bellinger i++; 51568ff9b9bSNicholas Bellinger } 51668ff9b9bSNicholas Bellinger sg_miter_stop(&m); 51768ff9b9bSNicholas Bellinger /* 51868ff9b9bSNicholas Bellinger * Save the original SGL + nents values before updating to new 51968ff9b9bSNicholas Bellinger * assignments, to be released in transport_free_pages() -> 52068ff9b9bSNicholas Bellinger * transport_reset_sgl_orig() 52168ff9b9bSNicholas Bellinger */ 52268ff9b9bSNicholas Bellinger cmd->t_data_sg_orig = cmd->t_data_sg; 52368ff9b9bSNicholas Bellinger cmd->t_data_sg = write_sg; 52468ff9b9bSNicholas Bellinger cmd->t_data_nents_orig = cmd->t_data_nents; 52568ff9b9bSNicholas Bellinger cmd->t_data_nents = 1; 52668ff9b9bSNicholas Bellinger 52768d81f40SChristoph Hellwig cmd->sam_task_attr = TCM_HEAD_TAG; 52868ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_post; 52968ff9b9bSNicholas Bellinger /* 53068ff9b9bSNicholas Bellinger * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler 53168ff9b9bSNicholas Bellinger * for submitting the adjusted SGL to write instance user-data. 53268ff9b9bSNicholas Bellinger */ 53368ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 53468ff9b9bSNicholas Bellinger 53568ff9b9bSNicholas Bellinger spin_lock_irq(&cmd->t_state_lock); 53668ff9b9bSNicholas Bellinger cmd->t_state = TRANSPORT_PROCESSING; 53768ff9b9bSNicholas Bellinger cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 53868ff9b9bSNicholas Bellinger spin_unlock_irq(&cmd->t_state_lock); 53968ff9b9bSNicholas Bellinger 54068ff9b9bSNicholas Bellinger __target_execute_cmd(cmd); 54168ff9b9bSNicholas Bellinger 54268ff9b9bSNicholas Bellinger kfree(buf); 54368ff9b9bSNicholas Bellinger return ret; 54468ff9b9bSNicholas Bellinger 54568ff9b9bSNicholas Bellinger miscompare: 54668ff9b9bSNicholas Bellinger pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", 54768ff9b9bSNicholas Bellinger dev->transport->name); 54868ff9b9bSNicholas Bellinger ret = TCM_MISCOMPARE_VERIFY; 54968ff9b9bSNicholas Bellinger out: 55068ff9b9bSNicholas Bellinger /* 55168ff9b9bSNicholas Bellinger * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in 55268ff9b9bSNicholas Bellinger * sbc_compare_and_write() before the original READ I/O submission. 55368ff9b9bSNicholas Bellinger */ 55468ff9b9bSNicholas Bellinger up(&dev->caw_sem); 55568ff9b9bSNicholas Bellinger kfree(write_sg); 55668ff9b9bSNicholas Bellinger kfree(buf); 55768ff9b9bSNicholas Bellinger return ret; 55868ff9b9bSNicholas Bellinger } 55968ff9b9bSNicholas Bellinger 56068ff9b9bSNicholas Bellinger static sense_reason_t 56168ff9b9bSNicholas Bellinger sbc_compare_and_write(struct se_cmd *cmd) 56268ff9b9bSNicholas Bellinger { 56368ff9b9bSNicholas Bellinger struct se_device *dev = cmd->se_dev; 56468ff9b9bSNicholas Bellinger sense_reason_t ret; 56568ff9b9bSNicholas Bellinger int rc; 56668ff9b9bSNicholas Bellinger /* 56768ff9b9bSNicholas Bellinger * Submit the READ first for COMPARE_AND_WRITE to perform the 56868ff9b9bSNicholas Bellinger * comparision using SGLs at cmd->t_bidi_data_sg.. 56968ff9b9bSNicholas Bellinger */ 57068ff9b9bSNicholas Bellinger rc = down_interruptible(&dev->caw_sem); 57168ff9b9bSNicholas Bellinger if ((rc != 0) || signal_pending(current)) { 57268ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 57368ff9b9bSNicholas Bellinger return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 57468ff9b9bSNicholas Bellinger } 575b7191253SNicholas Bellinger /* 576b7191253SNicholas Bellinger * Reset cmd->data_length to individual block_size in order to not 577b7191253SNicholas Bellinger * confuse backend drivers that depend on this value matching the 578b7191253SNicholas Bellinger * size of the I/O being submitted. 579b7191253SNicholas Bellinger */ 580b7191253SNicholas Bellinger cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; 58168ff9b9bSNicholas Bellinger 58268ff9b9bSNicholas Bellinger ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, 58368ff9b9bSNicholas Bellinger DMA_FROM_DEVICE); 58468ff9b9bSNicholas Bellinger if (ret) { 58568ff9b9bSNicholas Bellinger cmd->transport_complete_callback = NULL; 58668ff9b9bSNicholas Bellinger up(&dev->caw_sem); 58768ff9b9bSNicholas Bellinger return ret; 58868ff9b9bSNicholas Bellinger } 58968ff9b9bSNicholas Bellinger /* 59068ff9b9bSNicholas Bellinger * Unlock of dev->caw_sem to occur in compare_and_write_callback() 59168ff9b9bSNicholas Bellinger * upon MISCOMPARE, or in compare_and_write_done() upon completion 59268ff9b9bSNicholas Bellinger * of WRITE instance user-data. 59368ff9b9bSNicholas Bellinger */ 59468ff9b9bSNicholas Bellinger return TCM_NO_SENSE; 59568ff9b9bSNicholas Bellinger } 59668ff9b9bSNicholas Bellinger 59719f9361aSSagi Grimberg static int 59838b57f82SNicholas Bellinger sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, 59919f9361aSSagi Grimberg bool is_write, struct se_cmd *cmd) 60019f9361aSSagi Grimberg { 60119f9361aSSagi Grimberg if (is_write) { 60238b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : 60338b57f82SNicholas Bellinger protect ? TARGET_PROT_DOUT_PASS : 60419f9361aSSagi Grimberg TARGET_PROT_DOUT_INSERT; 60519f9361aSSagi Grimberg switch (protect) { 60619f9361aSSagi Grimberg case 0x0: 60719f9361aSSagi Grimberg case 0x3: 60819f9361aSSagi Grimberg cmd->prot_checks = 0; 60919f9361aSSagi Grimberg break; 61019f9361aSSagi Grimberg case 0x1: 61119f9361aSSagi Grimberg case 0x5: 61219f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 61319f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 61419f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 61519f9361aSSagi Grimberg break; 61619f9361aSSagi Grimberg case 0x2: 61719f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 61819f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 61919f9361aSSagi Grimberg break; 62019f9361aSSagi Grimberg case 0x4: 62119f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 62219f9361aSSagi Grimberg break; 62319f9361aSSagi Grimberg default: 62419f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 62519f9361aSSagi Grimberg return -EINVAL; 62619f9361aSSagi Grimberg } 62719f9361aSSagi Grimberg } else { 62838b57f82SNicholas Bellinger cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : 62938b57f82SNicholas Bellinger protect ? TARGET_PROT_DIN_PASS : 63019f9361aSSagi Grimberg TARGET_PROT_DIN_STRIP; 63119f9361aSSagi Grimberg switch (protect) { 63219f9361aSSagi Grimberg case 0x0: 63319f9361aSSagi Grimberg case 0x1: 63419f9361aSSagi Grimberg case 0x5: 63519f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 63619f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 63719f9361aSSagi Grimberg cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; 63819f9361aSSagi Grimberg break; 63919f9361aSSagi Grimberg case 0x2: 64019f9361aSSagi Grimberg if (prot_type == TARGET_DIF_TYPE1_PROT) 64119f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; 64219f9361aSSagi Grimberg break; 64319f9361aSSagi Grimberg case 0x3: 64419f9361aSSagi Grimberg cmd->prot_checks = 0; 64519f9361aSSagi Grimberg break; 64619f9361aSSagi Grimberg case 0x4: 64719f9361aSSagi Grimberg cmd->prot_checks = TARGET_DIF_CHECK_GUARD; 64819f9361aSSagi Grimberg break; 64919f9361aSSagi Grimberg default: 65019f9361aSSagi Grimberg pr_err("Unsupported protect field %d\n", protect); 65119f9361aSSagi Grimberg return -EINVAL; 65219f9361aSSagi Grimberg } 65319f9361aSSagi Grimberg } 65419f9361aSSagi Grimberg 65519f9361aSSagi Grimberg return 0; 65619f9361aSSagi Grimberg } 65719f9361aSSagi Grimberg 658f7b7c06fSNicholas Bellinger static sense_reason_t 659499bf77bSNicholas Bellinger sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, 66019f9361aSSagi Grimberg u32 sectors, bool is_write) 661499bf77bSNicholas Bellinger { 66219f9361aSSagi Grimberg u8 protect = cdb[1] >> 5; 66338b57f82SNicholas Bellinger int sp_ops = cmd->se_sess->sup_prot_ops; 66438b57f82SNicholas Bellinger int pi_prot_type = dev->dev_attrib.pi_prot_type; 66538b57f82SNicholas Bellinger bool fabric_prot = false; 66619f9361aSSagi Grimberg 667f7b7c06fSNicholas Bellinger if (!cmd->t_prot_sg || !cmd->t_prot_nents) { 66838b57f82SNicholas Bellinger if (unlikely(protect && 66938b57f82SNicholas Bellinger !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { 67038b57f82SNicholas Bellinger pr_err("CDB contains protect bit, but device + fabric does" 67138b57f82SNicholas Bellinger " not advertise PROTECT=1 feature bit\n"); 672f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 673f7b7c06fSNicholas Bellinger } 674f7b7c06fSNicholas Bellinger if (cmd->prot_pto) 675f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 676f7b7c06fSNicholas Bellinger } 677499bf77bSNicholas Bellinger 678499bf77bSNicholas Bellinger switch (dev->dev_attrib.pi_prot_type) { 679499bf77bSNicholas Bellinger case TARGET_DIF_TYPE3_PROT: 680499bf77bSNicholas Bellinger cmd->reftag_seed = 0xffffffff; 681499bf77bSNicholas Bellinger break; 682499bf77bSNicholas Bellinger case TARGET_DIF_TYPE2_PROT: 68319f9361aSSagi Grimberg if (protect) 684f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 685499bf77bSNicholas Bellinger 686499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 687499bf77bSNicholas Bellinger break; 688499bf77bSNicholas Bellinger case TARGET_DIF_TYPE1_PROT: 689499bf77bSNicholas Bellinger cmd->reftag_seed = cmd->t_task_lba; 690499bf77bSNicholas Bellinger break; 691499bf77bSNicholas Bellinger case TARGET_DIF_TYPE0_PROT: 69238b57f82SNicholas Bellinger /* 69338b57f82SNicholas Bellinger * See if the fabric supports T10-PI, and the session has been 69438b57f82SNicholas Bellinger * configured to allow export PROTECT=1 feature bit with backend 69538b57f82SNicholas Bellinger * devices that don't support T10-PI. 69638b57f82SNicholas Bellinger */ 69738b57f82SNicholas Bellinger fabric_prot = is_write ? 69838b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : 69938b57f82SNicholas Bellinger !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); 70038b57f82SNicholas Bellinger 70138b57f82SNicholas Bellinger if (fabric_prot && cmd->se_sess->sess_prot_type) { 70238b57f82SNicholas Bellinger pi_prot_type = cmd->se_sess->sess_prot_type; 70338b57f82SNicholas Bellinger break; 70438b57f82SNicholas Bellinger } 705cceca4a6SNicholas Bellinger if (!protect) 706cceca4a6SNicholas Bellinger return TCM_NO_SENSE; 70738b57f82SNicholas Bellinger /* Fallthrough */ 708499bf77bSNicholas Bellinger default: 709cceca4a6SNicholas Bellinger pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " 710cceca4a6SNicholas Bellinger "PROTECT: 0x%02x\n", cdb[0], protect); 711cceca4a6SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 712499bf77bSNicholas Bellinger } 713499bf77bSNicholas Bellinger 71438b57f82SNicholas Bellinger if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) 715f7b7c06fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 71619f9361aSSagi Grimberg 71738b57f82SNicholas Bellinger cmd->prot_type = pi_prot_type; 718499bf77bSNicholas Bellinger cmd->prot_length = dev->prot_length * sectors; 719e2a4f55cSSagi Grimberg 720e2a4f55cSSagi Grimberg /** 721e2a4f55cSSagi Grimberg * In case protection information exists over the wire 722e2a4f55cSSagi Grimberg * we modify command data length to describe pure data. 723e2a4f55cSSagi Grimberg * The actual transfer length is data length + protection 724e2a4f55cSSagi Grimberg * length 725e2a4f55cSSagi Grimberg **/ 726e2a4f55cSSagi Grimberg if (protect) 727e2a4f55cSSagi Grimberg cmd->data_length = sectors * dev->dev_attrib.block_size; 728e2a4f55cSSagi Grimberg 729e2a4f55cSSagi Grimberg pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " 730e2a4f55cSSagi Grimberg "prot_op=%d prot_checks=%d\n", 731e2a4f55cSSagi Grimberg __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, 73203abad9eSSagi Grimberg cmd->prot_op, cmd->prot_checks); 733499bf77bSNicholas Bellinger 734f7b7c06fSNicholas Bellinger return TCM_NO_SENSE; 735499bf77bSNicholas Bellinger } 736499bf77bSNicholas Bellinger 737fde9f50fSNicholas Bellinger static int 738fde9f50fSNicholas Bellinger sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) 739fde9f50fSNicholas Bellinger { 740fde9f50fSNicholas Bellinger if (cdb[1] & 0x10) { 741fde9f50fSNicholas Bellinger if (!dev->dev_attrib.emulate_dpo) { 742fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with DPO bit set, but device" 743fde9f50fSNicholas Bellinger " does not advertise support for DPO\n", cdb[0]); 744fde9f50fSNicholas Bellinger return -EINVAL; 745fde9f50fSNicholas Bellinger } 746fde9f50fSNicholas Bellinger } 747fde9f50fSNicholas Bellinger if (cdb[1] & 0x8) { 748fde9f50fSNicholas Bellinger if (!dev->dev_attrib.emulate_fua_write || 749fde9f50fSNicholas Bellinger !dev->dev_attrib.emulate_write_cache) { 750fde9f50fSNicholas Bellinger pr_err("Got CDB: 0x%02x with FUA bit set, but device" 751fde9f50fSNicholas Bellinger " does not advertise support for FUA write\n", 752fde9f50fSNicholas Bellinger cdb[0]); 753fde9f50fSNicholas Bellinger return -EINVAL; 754fde9f50fSNicholas Bellinger } 755fde9f50fSNicholas Bellinger cmd->se_cmd_flags |= SCF_FUA; 756fde9f50fSNicholas Bellinger } 757fde9f50fSNicholas Bellinger return 0; 758d6e0175cSChristoph Hellwig } 759d6e0175cSChristoph Hellwig 760de103c93SChristoph Hellwig sense_reason_t 761de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 762d6e0175cSChristoph Hellwig { 763d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 764d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 7651fd032eeSChristoph Hellwig unsigned int size; 766d6e0175cSChristoph Hellwig u32 sectors = 0; 767de103c93SChristoph Hellwig sense_reason_t ret; 768d6e0175cSChristoph Hellwig 769d6e0175cSChristoph Hellwig switch (cdb[0]) { 770d6e0175cSChristoph Hellwig case READ_6: 771d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 772d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 773d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 774a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 775a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 776d6e0175cSChristoph Hellwig break; 777d6e0175cSChristoph Hellwig case READ_10: 778d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 779d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 780499bf77bSNicholas Bellinger 781fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 782fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 783fde9f50fSNicholas Bellinger 784f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 785f7b7c06fSNicholas Bellinger if (ret) 786f7b7c06fSNicholas Bellinger return ret; 787499bf77bSNicholas Bellinger 788d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 789a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 790a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 791d6e0175cSChristoph Hellwig break; 792d6e0175cSChristoph Hellwig case READ_12: 793d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 794d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 795499bf77bSNicholas Bellinger 796fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 797fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 798fde9f50fSNicholas Bellinger 799f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 800f7b7c06fSNicholas Bellinger if (ret) 801f7b7c06fSNicholas Bellinger return ret; 802499bf77bSNicholas Bellinger 803d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 804a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 805a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 806d6e0175cSChristoph Hellwig break; 807d6e0175cSChristoph Hellwig case READ_16: 808d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 809d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 810499bf77bSNicholas Bellinger 811fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 812fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 813fde9f50fSNicholas Bellinger 814f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, false); 815f7b7c06fSNicholas Bellinger if (ret) 816f7b7c06fSNicholas Bellinger return ret; 817499bf77bSNicholas Bellinger 818d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 819a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 820a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 821d6e0175cSChristoph Hellwig break; 822d6e0175cSChristoph Hellwig case WRITE_6: 823d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 824d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 825d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 826a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 827a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 828d6e0175cSChristoph Hellwig break; 829d6e0175cSChristoph Hellwig case WRITE_10: 830d6e0175cSChristoph Hellwig case WRITE_VERIFY: 831d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 832d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 833499bf77bSNicholas Bellinger 834fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 835fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 836499bf77bSNicholas Bellinger 837f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 838f7b7c06fSNicholas Bellinger if (ret) 839f7b7c06fSNicholas Bellinger return ret; 840d6e0175cSChristoph Hellwig 841d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 842a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 843a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 844d6e0175cSChristoph Hellwig break; 845d6e0175cSChristoph Hellwig case WRITE_12: 846d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 847d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 848499bf77bSNicholas Bellinger 849fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 850fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 851499bf77bSNicholas Bellinger 852f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 853f7b7c06fSNicholas Bellinger if (ret) 854f7b7c06fSNicholas Bellinger return ret; 855d6e0175cSChristoph Hellwig 856d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 857a82a9538SNicholas Bellinger cmd->execute_rw = ops->execute_rw; 858a82a9538SNicholas Bellinger cmd->execute_cmd = sbc_execute_rw; 859d6e0175cSChristoph Hellwig break; 860d6e0175cSChristoph Hellwig case WRITE_16: 861d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 862d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 863499bf77bSNicholas Bellinger 864fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 865fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 866499bf77bSNicholas Bellinger 867f7b7c06fSNicholas Bellinger ret = sbc_check_prot(dev, cmd, cdb, sectors, true); 868f7b7c06fSNicholas Bellinger if (ret) 869f7b7c06fSNicholas Bellinger return ret; 870cd063befSNicholas Bellinger 871d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 872d6e0175cSChristoph Hellwig cmd->execute_rw = ops->execute_rw; 873d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 874d6e0175cSChristoph Hellwig break; 875d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 876d6e0175cSChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 877d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 878d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 879d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 880d6e0175cSChristoph Hellwig 881fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 882fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 883fde9f50fSNicholas Bellinger 884d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 885d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 886d6e0175cSChristoph Hellwig 887d6e0175cSChristoph Hellwig /* 888d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 889d6e0175cSChristoph Hellwig */ 890d6e0175cSChristoph Hellwig cmd->execute_rw = ops->execute_rw; 891d6e0175cSChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 892d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 8930c2ad7d1SChristoph Hellwig break; 894d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 895d6e0175cSChristoph Hellwig { 896d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 897d6e0175cSChristoph Hellwig switch (service_action) { 898d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 8996f974e8cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 900de103c93SChristoph Hellwig 901fde9f50fSNicholas Bellinger if (sbc_check_dpofua(dev, cmd, cdb)) 902fde9f50fSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 9036f974e8cSChristoph Hellwig /* 904d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 905d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 906d6e0175cSChristoph Hellwig */ 907d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 908de103c93SChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 909d6e0175cSChristoph Hellwig 910d6e0175cSChristoph Hellwig /* 9111fd032eeSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 912d6e0175cSChristoph Hellwig * completion. 913d6e0175cSChristoph Hellwig */ 914d6e0175cSChristoph Hellwig cmd->execute_rw = ops->execute_rw; 915de103c93SChristoph Hellwig cmd->execute_cmd = sbc_execute_rw; 9166f974e8cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 917d6e0175cSChristoph Hellwig break; 918d6e0175cSChristoph Hellwig case WRITE_SAME_32: 919d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 920d6e0175cSChristoph Hellwig if (!sectors) { 921d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 922d6e0175cSChristoph Hellwig " supported\n"); 923d6e0175cSChristoph Hellwig return TCM_INVALID_CDB_FIELD; 924d6e0175cSChristoph Hellwig } 925d6e0175cSChristoph Hellwig 926d6e0175cSChristoph Hellwig size = sbc_get_size(cmd, 1); 927d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 928d6e0175cSChristoph Hellwig 929d6e0175cSChristoph Hellwig ret = sbc_setup_write_same(cmd, &cdb[10], ops); 930d6e0175cSChristoph Hellwig if (ret) 9311fd032eeSChristoph Hellwig return ret; 932d6e0175cSChristoph Hellwig break; 933d6e0175cSChristoph Hellwig default: 934d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 935d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 936de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 937d6e0175cSChristoph Hellwig } 938d6e0175cSChristoph Hellwig break; 939d6e0175cSChristoph Hellwig } 94068ff9b9bSNicholas Bellinger case COMPARE_AND_WRITE: 94168ff9b9bSNicholas Bellinger sectors = cdb[13]; 94268ff9b9bSNicholas Bellinger /* 94368ff9b9bSNicholas Bellinger * Currently enforce COMPARE_AND_WRITE for a single sector 94468ff9b9bSNicholas Bellinger */ 94568ff9b9bSNicholas Bellinger if (sectors > 1) { 94668ff9b9bSNicholas Bellinger pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" 94768ff9b9bSNicholas Bellinger " than 1\n", sectors); 94868ff9b9bSNicholas Bellinger return TCM_INVALID_CDB_FIELD; 94968ff9b9bSNicholas Bellinger } 95068ff9b9bSNicholas Bellinger /* 95168ff9b9bSNicholas Bellinger * Double size because we have two buffers, note that 95268ff9b9bSNicholas Bellinger * zero is not an error.. 95368ff9b9bSNicholas Bellinger */ 95468ff9b9bSNicholas Bellinger size = 2 * sbc_get_size(cmd, sectors); 95568ff9b9bSNicholas Bellinger cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 95668ff9b9bSNicholas Bellinger cmd->t_task_nolb = sectors; 95768ff9b9bSNicholas Bellinger cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; 95868ff9b9bSNicholas Bellinger cmd->execute_rw = ops->execute_rw; 95968ff9b9bSNicholas Bellinger cmd->execute_cmd = sbc_compare_and_write; 96068ff9b9bSNicholas Bellinger cmd->transport_complete_callback = compare_and_write_callback; 96168ff9b9bSNicholas Bellinger break; 962d6e0175cSChristoph Hellwig case READ_CAPACITY: 9631fd032eeSChristoph Hellwig size = READ_CAP_LEN; 9641fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 965d6e0175cSChristoph Hellwig break; 966eb846d9fSHannes Reinecke case SERVICE_ACTION_IN_16: 967d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 968d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 9691fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 970d6e0175cSChristoph Hellwig break; 971c66094bfSHannes Reinecke case SAI_REPORT_REFERRALS: 972c66094bfSHannes Reinecke cmd->execute_cmd = target_emulate_report_referrals; 973c66094bfSHannes Reinecke break; 974d6e0175cSChristoph Hellwig default: 975d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 976d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 977de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 978d6e0175cSChristoph Hellwig } 9791fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 980d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 981d6e0175cSChristoph Hellwig break; 982d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 983d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 984d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 985d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 986d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 987d6e0175cSChristoph Hellwig } else { 988d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 989d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 990d6e0175cSChristoph Hellwig } 9916ef31dc7SChristophe Vu-Brugier if (ops->execute_sync_cache) { 992ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 9936ef31dc7SChristophe Vu-Brugier goto check_lba; 9946ef31dc7SChristophe Vu-Brugier } 9956ef31dc7SChristophe Vu-Brugier size = 0; 9966ef31dc7SChristophe Vu-Brugier cmd->execute_cmd = sbc_emulate_noop; 997d6e0175cSChristoph Hellwig break; 998d6e0175cSChristoph Hellwig case UNMAP: 99914150a6bSChristoph Hellwig if (!ops->execute_unmap) 1000de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 100114150a6bSChristoph Hellwig 100261fdb4acSNicholas Bellinger if (!dev->dev_attrib.emulate_tpu) { 100361fdb4acSNicholas Bellinger pr_err("Got UNMAP, but backend device has" 100461fdb4acSNicholas Bellinger " emulate_tpu disabled\n"); 100561fdb4acSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 100661fdb4acSNicholas Bellinger } 10071fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 100814150a6bSChristoph Hellwig cmd->execute_cmd = ops->execute_unmap; 1009d6e0175cSChristoph Hellwig break; 1010d6e0175cSChristoph Hellwig case WRITE_SAME_16: 1011d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 1012d6e0175cSChristoph Hellwig if (!sectors) { 1013d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1014de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1015d6e0175cSChristoph Hellwig } 1016d6e0175cSChristoph Hellwig 10171fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1018d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 1019d6e0175cSChristoph Hellwig 1020cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10216b64e1feSDan Carpenter if (ret) 1022cd063befSNicholas Bellinger return ret; 1023d6e0175cSChristoph Hellwig break; 1024d6e0175cSChristoph Hellwig case WRITE_SAME: 1025d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 1026d6e0175cSChristoph Hellwig if (!sectors) { 1027d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 1028de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 1029d6e0175cSChristoph Hellwig } 1030d6e0175cSChristoph Hellwig 10311fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 1032d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 1033d6e0175cSChristoph Hellwig 1034d6e0175cSChristoph Hellwig /* 1035d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 1036d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 1037d6e0175cSChristoph Hellwig */ 1038cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 10396b64e1feSDan Carpenter if (ret) 1040cd063befSNicholas Bellinger return ret; 1041d6e0175cSChristoph Hellwig break; 1042d6e0175cSChristoph Hellwig case VERIFY: 10431fd032eeSChristoph Hellwig size = 0; 1044c52716deSChristophe Vu-Brugier sectors = transport_get_sectors_10(cdb); 1045c52716deSChristophe Vu-Brugier cmd->t_task_lba = transport_lba_32(cdb); 10461920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 1047c52716deSChristophe Vu-Brugier goto check_lba; 10481a1ff38cSBernhard Kohl case REZERO_UNIT: 10491a1ff38cSBernhard Kohl case SEEK_6: 10501a1ff38cSBernhard Kohl case SEEK_10: 10511a1ff38cSBernhard Kohl /* 10521a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 10531a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 10541a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 10551a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 10561a1ff38cSBernhard Kohl */ 10571a1ff38cSBernhard Kohl size = 0; 10581a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 10591a1ff38cSBernhard Kohl break; 1060d6e0175cSChristoph Hellwig default: 10611fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 1062d6e0175cSChristoph Hellwig if (ret) 1063d6e0175cSChristoph Hellwig return ret; 1064d6e0175cSChristoph Hellwig } 1065d6e0175cSChristoph Hellwig 1066d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 106720959c4bSAndy Grover if (!cmd->execute_cmd) 1068de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 1069d6e0175cSChristoph Hellwig 1070d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 10711fd032eeSChristoph Hellwig unsigned long long end_lba; 10726ef31dc7SChristophe Vu-Brugier check_lba: 10731fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 1074aa179935SNicholas Bellinger if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || 1075aa179935SNicholas Bellinger ((cmd->t_task_lba + sectors) > end_lba)) { 10761fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 10771fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 10781fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 107909ceadc7SRoland Dreier return TCM_ADDRESS_OUT_OF_RANGE; 1080d6e0175cSChristoph Hellwig } 1081d6e0175cSChristoph Hellwig 108268ff9b9bSNicholas Bellinger if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) 10831fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 10841fd032eeSChristoph Hellwig } 10851fd032eeSChristoph Hellwig 1086de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 1087d6e0175cSChristoph Hellwig } 1088d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 10896f23ac8aSChristoph Hellwig 10906f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 10916f23ac8aSChristoph Hellwig { 10926f23ac8aSChristoph Hellwig return TYPE_DISK; 10936f23ac8aSChristoph Hellwig } 10946f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 109586d71829SAsias He 109686d71829SAsias He sense_reason_t 109786d71829SAsias He sbc_execute_unmap(struct se_cmd *cmd, 109886d71829SAsias He sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, 109986d71829SAsias He sector_t, sector_t), 110086d71829SAsias He void *priv) 110186d71829SAsias He { 110286d71829SAsias He struct se_device *dev = cmd->se_dev; 110386d71829SAsias He unsigned char *buf, *ptr = NULL; 110486d71829SAsias He sector_t lba; 110586d71829SAsias He int size; 110686d71829SAsias He u32 range; 110786d71829SAsias He sense_reason_t ret = 0; 110886d71829SAsias He int dl, bd_dl; 110986d71829SAsias He 111086d71829SAsias He /* We never set ANC_SUP */ 111186d71829SAsias He if (cmd->t_task_cdb[1]) 111286d71829SAsias He return TCM_INVALID_CDB_FIELD; 111386d71829SAsias He 111486d71829SAsias He if (cmd->data_length == 0) { 111586d71829SAsias He target_complete_cmd(cmd, SAM_STAT_GOOD); 111686d71829SAsias He return 0; 111786d71829SAsias He } 111886d71829SAsias He 111986d71829SAsias He if (cmd->data_length < 8) { 112086d71829SAsias He pr_warn("UNMAP parameter list length %u too small\n", 112186d71829SAsias He cmd->data_length); 112286d71829SAsias He return TCM_PARAMETER_LIST_LENGTH_ERROR; 112386d71829SAsias He } 112486d71829SAsias He 112586d71829SAsias He buf = transport_kmap_data_sg(cmd); 112686d71829SAsias He if (!buf) 112786d71829SAsias He return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 112886d71829SAsias He 112986d71829SAsias He dl = get_unaligned_be16(&buf[0]); 113086d71829SAsias He bd_dl = get_unaligned_be16(&buf[2]); 113186d71829SAsias He 113286d71829SAsias He size = cmd->data_length - 8; 113386d71829SAsias He if (bd_dl > size) 113486d71829SAsias He pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", 113586d71829SAsias He cmd->data_length, bd_dl); 113686d71829SAsias He else 113786d71829SAsias He size = bd_dl; 113886d71829SAsias He 113986d71829SAsias He if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { 114086d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 114186d71829SAsias He goto err; 114286d71829SAsias He } 114386d71829SAsias He 114486d71829SAsias He /* First UNMAP block descriptor starts at 8 byte offset */ 114586d71829SAsias He ptr = &buf[8]; 114686d71829SAsias He pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" 114786d71829SAsias He " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); 114886d71829SAsias He 114986d71829SAsias He while (size >= 16) { 115086d71829SAsias He lba = get_unaligned_be64(&ptr[0]); 115186d71829SAsias He range = get_unaligned_be32(&ptr[8]); 115286d71829SAsias He pr_debug("UNMAP: Using lba: %llu and range: %u\n", 115386d71829SAsias He (unsigned long long)lba, range); 115486d71829SAsias He 115586d71829SAsias He if (range > dev->dev_attrib.max_unmap_lba_count) { 115686d71829SAsias He ret = TCM_INVALID_PARAMETER_LIST; 115786d71829SAsias He goto err; 115886d71829SAsias He } 115986d71829SAsias He 116086d71829SAsias He if (lba + range > dev->transport->get_blocks(dev) + 1) { 116186d71829SAsias He ret = TCM_ADDRESS_OUT_OF_RANGE; 116286d71829SAsias He goto err; 116386d71829SAsias He } 116486d71829SAsias He 116586d71829SAsias He ret = do_unmap_fn(cmd, priv, lba, range); 116686d71829SAsias He if (ret) 116786d71829SAsias He goto err; 116886d71829SAsias He 116986d71829SAsias He ptr += 16; 117086d71829SAsias He size -= 16; 117186d71829SAsias He } 117286d71829SAsias He 117386d71829SAsias He err: 117486d71829SAsias He transport_kunmap_data_sg(cmd); 117586d71829SAsias He if (!ret) 117686d71829SAsias He target_complete_cmd(cmd, GOOD); 117786d71829SAsias He return ret; 117886d71829SAsias He } 117986d71829SAsias He EXPORT_SYMBOL(sbc_execute_unmap); 118041861fa8SNicholas Bellinger 118166a3d5bcSNicholas Bellinger void 118266a3d5bcSNicholas Bellinger sbc_dif_generate(struct se_cmd *cmd) 118366a3d5bcSNicholas Bellinger { 118466a3d5bcSNicholas Bellinger struct se_device *dev = cmd->se_dev; 118566a3d5bcSNicholas Bellinger struct se_dif_v1_tuple *sdt; 118666a3d5bcSNicholas Bellinger struct scatterlist *dsg, *psg = cmd->t_prot_sg; 118766a3d5bcSNicholas Bellinger sector_t sector = cmd->t_task_lba; 118866a3d5bcSNicholas Bellinger void *daddr, *paddr; 118966a3d5bcSNicholas Bellinger int i, j, offset = 0; 119066a3d5bcSNicholas Bellinger 119166a3d5bcSNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 119266a3d5bcSNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 119366a3d5bcSNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 119466a3d5bcSNicholas Bellinger 119566a3d5bcSNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 119666a3d5bcSNicholas Bellinger 119766a3d5bcSNicholas Bellinger if (offset >= psg->length) { 119866a3d5bcSNicholas Bellinger kunmap_atomic(paddr); 119966a3d5bcSNicholas Bellinger psg = sg_next(psg); 120066a3d5bcSNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 120166a3d5bcSNicholas Bellinger offset = 0; 120266a3d5bcSNicholas Bellinger } 120366a3d5bcSNicholas Bellinger 120466a3d5bcSNicholas Bellinger sdt = paddr + offset; 120566a3d5bcSNicholas Bellinger sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, 120666a3d5bcSNicholas Bellinger dev->dev_attrib.block_size)); 1207823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) 120866a3d5bcSNicholas Bellinger sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); 120966a3d5bcSNicholas Bellinger sdt->app_tag = 0; 121066a3d5bcSNicholas Bellinger 12116ae50408SNicholas Bellinger pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" 121266a3d5bcSNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 12136ae50408SNicholas Bellinger (cmd->data_direction == DMA_TO_DEVICE) ? 12146ae50408SNicholas Bellinger "WRITE" : "READ", (unsigned long long)sector, 12156ae50408SNicholas Bellinger sdt->guard_tag, sdt->app_tag, 12166ae50408SNicholas Bellinger be32_to_cpu(sdt->ref_tag)); 121766a3d5bcSNicholas Bellinger 121866a3d5bcSNicholas Bellinger sector++; 121966a3d5bcSNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 122066a3d5bcSNicholas Bellinger } 122166a3d5bcSNicholas Bellinger 122266a3d5bcSNicholas Bellinger kunmap_atomic(paddr); 122366a3d5bcSNicholas Bellinger kunmap_atomic(daddr); 122466a3d5bcSNicholas Bellinger } 122566a3d5bcSNicholas Bellinger } 122666a3d5bcSNicholas Bellinger 122741861fa8SNicholas Bellinger static sense_reason_t 1228823ddd87SNicholas Bellinger sbc_dif_v1_verify(struct se_cmd *cmd, struct se_dif_v1_tuple *sdt, 122941861fa8SNicholas Bellinger const void *p, sector_t sector, unsigned int ei_lba) 123041861fa8SNicholas Bellinger { 1231823ddd87SNicholas Bellinger struct se_device *dev = cmd->se_dev; 123241861fa8SNicholas Bellinger int block_size = dev->dev_attrib.block_size; 123341861fa8SNicholas Bellinger __be16 csum; 123441861fa8SNicholas Bellinger 1235d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) 1236d7a463b0SNicholas Bellinger goto check_ref; 1237d7a463b0SNicholas Bellinger 123841861fa8SNicholas Bellinger csum = cpu_to_be16(crc_t10dif(p, block_size)); 123941861fa8SNicholas Bellinger 124041861fa8SNicholas Bellinger if (sdt->guard_tag != csum) { 124141861fa8SNicholas Bellinger pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" 124241861fa8SNicholas Bellinger " csum 0x%04x\n", (unsigned long long)sector, 124341861fa8SNicholas Bellinger be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); 124441861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; 124541861fa8SNicholas Bellinger } 124641861fa8SNicholas Bellinger 1247d7a463b0SNicholas Bellinger check_ref: 1248d7a463b0SNicholas Bellinger if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) 1249d7a463b0SNicholas Bellinger return 0; 1250d7a463b0SNicholas Bellinger 1251823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && 125241861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { 125341861fa8SNicholas Bellinger pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" 125441861fa8SNicholas Bellinger " sector MSB: 0x%08x\n", (unsigned long long)sector, 125541861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); 125641861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 125741861fa8SNicholas Bellinger } 125841861fa8SNicholas Bellinger 1259823ddd87SNicholas Bellinger if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && 126041861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag) != ei_lba) { 126141861fa8SNicholas Bellinger pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" 126241861fa8SNicholas Bellinger " ei_lba: 0x%08x\n", (unsigned long long)sector, 126341861fa8SNicholas Bellinger be32_to_cpu(sdt->ref_tag), ei_lba); 126441861fa8SNicholas Bellinger return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; 126541861fa8SNicholas Bellinger } 126641861fa8SNicholas Bellinger 126741861fa8SNicholas Bellinger return 0; 126841861fa8SNicholas Bellinger } 126941861fa8SNicholas Bellinger 127041861fa8SNicholas Bellinger static void 127141861fa8SNicholas Bellinger sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, 127241861fa8SNicholas Bellinger struct scatterlist *sg, int sg_off) 127341861fa8SNicholas Bellinger { 127441861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 127541861fa8SNicholas Bellinger struct scatterlist *psg; 127641861fa8SNicholas Bellinger void *paddr, *addr; 127741861fa8SNicholas Bellinger unsigned int i, len, left; 127810762e80SNicholas Bellinger unsigned int offset = sg_off; 127941861fa8SNicholas Bellinger 128038b57f82SNicholas Bellinger if (!sg) 128138b57f82SNicholas Bellinger return; 128238b57f82SNicholas Bellinger 128341861fa8SNicholas Bellinger left = sectors * dev->prot_length; 128441861fa8SNicholas Bellinger 128541861fa8SNicholas Bellinger for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { 128616c0ae02SSagi Grimberg unsigned int psg_len, copied = 0; 128741861fa8SNicholas Bellinger 128816c0ae02SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 128916c0ae02SSagi Grimberg psg_len = min(left, psg->length); 129016c0ae02SSagi Grimberg while (psg_len) { 129116c0ae02SSagi Grimberg len = min(psg_len, sg->length - offset); 129216c0ae02SSagi Grimberg addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; 129316c0ae02SSagi Grimberg 129416c0ae02SSagi Grimberg if (read) 129516c0ae02SSagi Grimberg memcpy(paddr + copied, addr, len); 129616c0ae02SSagi Grimberg else 129716c0ae02SSagi Grimberg memcpy(addr, paddr + copied, len); 129816c0ae02SSagi Grimberg 129916c0ae02SSagi Grimberg left -= len; 130016c0ae02SSagi Grimberg offset += len; 130116c0ae02SSagi Grimberg copied += len; 130216c0ae02SSagi Grimberg psg_len -= len; 130316c0ae02SSagi Grimberg 1304d6a65fdcSSagi Grimberg if (offset >= sg->length) { 1305d6a65fdcSSagi Grimberg sg = sg_next(sg); 1306d6a65fdcSSagi Grimberg offset = 0; 1307d6a65fdcSSagi Grimberg } 130841861fa8SNicholas Bellinger kunmap_atomic(addr); 130941861fa8SNicholas Bellinger } 131016c0ae02SSagi Grimberg kunmap_atomic(paddr); 131116c0ae02SSagi Grimberg } 131241861fa8SNicholas Bellinger } 131341861fa8SNicholas Bellinger 131441861fa8SNicholas Bellinger sense_reason_t 131541861fa8SNicholas Bellinger sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, 131641861fa8SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 131741861fa8SNicholas Bellinger { 131841861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 131941861fa8SNicholas Bellinger struct se_dif_v1_tuple *sdt; 132041861fa8SNicholas Bellinger struct scatterlist *dsg, *psg = cmd->t_prot_sg; 132141861fa8SNicholas Bellinger sector_t sector = start; 132241861fa8SNicholas Bellinger void *daddr, *paddr; 132341861fa8SNicholas Bellinger int i, j, offset = 0; 132441861fa8SNicholas Bellinger sense_reason_t rc; 132541861fa8SNicholas Bellinger 132641861fa8SNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 132741861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 132841861fa8SNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 132941861fa8SNicholas Bellinger 133041861fa8SNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 133141861fa8SNicholas Bellinger 133241861fa8SNicholas Bellinger if (offset >= psg->length) { 133341861fa8SNicholas Bellinger kunmap_atomic(paddr); 133441861fa8SNicholas Bellinger psg = sg_next(psg); 133541861fa8SNicholas Bellinger paddr = kmap_atomic(sg_page(psg)) + psg->offset; 133641861fa8SNicholas Bellinger offset = 0; 133741861fa8SNicholas Bellinger } 133841861fa8SNicholas Bellinger 133941861fa8SNicholas Bellinger sdt = paddr + offset; 134041861fa8SNicholas Bellinger 134141861fa8SNicholas Bellinger pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" 134241861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 134341861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 134441861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 134541861fa8SNicholas Bellinger 1346823ddd87SNicholas Bellinger rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector, 134741861fa8SNicholas Bellinger ei_lba); 134841861fa8SNicholas Bellinger if (rc) { 134941861fa8SNicholas Bellinger kunmap_atomic(paddr); 135041861fa8SNicholas Bellinger kunmap_atomic(daddr); 135176736db3SSagi Grimberg cmd->bad_sector = sector; 135241861fa8SNicholas Bellinger return rc; 135341861fa8SNicholas Bellinger } 135441861fa8SNicholas Bellinger 135541861fa8SNicholas Bellinger sector++; 135641861fa8SNicholas Bellinger ei_lba++; 135741861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 135841861fa8SNicholas Bellinger } 135941861fa8SNicholas Bellinger 136041861fa8SNicholas Bellinger kunmap_atomic(paddr); 136141861fa8SNicholas Bellinger kunmap_atomic(daddr); 136241861fa8SNicholas Bellinger } 13635132d1e6SNicholas Bellinger if (!sg) 13645132d1e6SNicholas Bellinger return 0; 13655132d1e6SNicholas Bellinger 136641861fa8SNicholas Bellinger sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); 136741861fa8SNicholas Bellinger 136841861fa8SNicholas Bellinger return 0; 136941861fa8SNicholas Bellinger } 137041861fa8SNicholas Bellinger EXPORT_SYMBOL(sbc_dif_verify_write); 137141861fa8SNicholas Bellinger 1372395ccb25SNicholas Bellinger static sense_reason_t 1373395ccb25SNicholas Bellinger __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 137441861fa8SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 137541861fa8SNicholas Bellinger { 137641861fa8SNicholas Bellinger struct se_device *dev = cmd->se_dev; 137741861fa8SNicholas Bellinger struct se_dif_v1_tuple *sdt; 1378fc272ec7SSagi Grimberg struct scatterlist *dsg, *psg = sg; 137941861fa8SNicholas Bellinger sector_t sector = start; 138041861fa8SNicholas Bellinger void *daddr, *paddr; 138141861fa8SNicholas Bellinger int i, j, offset = sg_off; 138241861fa8SNicholas Bellinger sense_reason_t rc; 138341861fa8SNicholas Bellinger 138441861fa8SNicholas Bellinger for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { 138541861fa8SNicholas Bellinger daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; 1386fc272ec7SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + sg->offset; 138741861fa8SNicholas Bellinger 138841861fa8SNicholas Bellinger for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { 138941861fa8SNicholas Bellinger 1390fc272ec7SSagi Grimberg if (offset >= psg->length) { 139141861fa8SNicholas Bellinger kunmap_atomic(paddr); 1392fc272ec7SSagi Grimberg psg = sg_next(psg); 1393fc272ec7SSagi Grimberg paddr = kmap_atomic(sg_page(psg)) + psg->offset; 139441861fa8SNicholas Bellinger offset = 0; 139541861fa8SNicholas Bellinger } 139641861fa8SNicholas Bellinger 139741861fa8SNicholas Bellinger sdt = paddr + offset; 139841861fa8SNicholas Bellinger 139941861fa8SNicholas Bellinger pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" 140041861fa8SNicholas Bellinger " app_tag: 0x%04x ref_tag: %u\n", 140141861fa8SNicholas Bellinger (unsigned long long)sector, sdt->guard_tag, 140241861fa8SNicholas Bellinger sdt->app_tag, be32_to_cpu(sdt->ref_tag)); 140341861fa8SNicholas Bellinger 140441861fa8SNicholas Bellinger if (sdt->app_tag == cpu_to_be16(0xffff)) { 140541861fa8SNicholas Bellinger sector++; 140641861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 140741861fa8SNicholas Bellinger continue; 140841861fa8SNicholas Bellinger } 140941861fa8SNicholas Bellinger 1410823ddd87SNicholas Bellinger rc = sbc_dif_v1_verify(cmd, sdt, daddr + j, sector, 141141861fa8SNicholas Bellinger ei_lba); 141241861fa8SNicholas Bellinger if (rc) { 141341861fa8SNicholas Bellinger kunmap_atomic(paddr); 141441861fa8SNicholas Bellinger kunmap_atomic(daddr); 141576736db3SSagi Grimberg cmd->bad_sector = sector; 141641861fa8SNicholas Bellinger return rc; 141741861fa8SNicholas Bellinger } 141841861fa8SNicholas Bellinger 141941861fa8SNicholas Bellinger sector++; 142041861fa8SNicholas Bellinger ei_lba++; 142141861fa8SNicholas Bellinger offset += sizeof(struct se_dif_v1_tuple); 142241861fa8SNicholas Bellinger } 142341861fa8SNicholas Bellinger 142441861fa8SNicholas Bellinger kunmap_atomic(paddr); 142541861fa8SNicholas Bellinger kunmap_atomic(daddr); 142641861fa8SNicholas Bellinger } 142741861fa8SNicholas Bellinger 142841861fa8SNicholas Bellinger return 0; 142941861fa8SNicholas Bellinger } 1430395ccb25SNicholas Bellinger 1431395ccb25SNicholas Bellinger sense_reason_t 1432395ccb25SNicholas Bellinger sbc_dif_read_strip(struct se_cmd *cmd) 1433395ccb25SNicholas Bellinger { 1434395ccb25SNicholas Bellinger struct se_device *dev = cmd->se_dev; 1435395ccb25SNicholas Bellinger u32 sectors = cmd->prot_length / dev->prot_length; 1436395ccb25SNicholas Bellinger 1437395ccb25SNicholas Bellinger return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, 1438395ccb25SNicholas Bellinger cmd->t_prot_sg, 0); 1439395ccb25SNicholas Bellinger } 1440395ccb25SNicholas Bellinger 1441395ccb25SNicholas Bellinger sense_reason_t 1442395ccb25SNicholas Bellinger sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, 1443395ccb25SNicholas Bellinger unsigned int ei_lba, struct scatterlist *sg, int sg_off) 1444395ccb25SNicholas Bellinger { 1445395ccb25SNicholas Bellinger sense_reason_t rc; 1446395ccb25SNicholas Bellinger 1447395ccb25SNicholas Bellinger rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); 1448395ccb25SNicholas Bellinger if (rc) 1449395ccb25SNicholas Bellinger return rc; 1450395ccb25SNicholas Bellinger 1451395ccb25SNicholas Bellinger sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); 1452395ccb25SNicholas Bellinger return 0; 1453395ccb25SNicholas Bellinger } 145441861fa8SNicholas Bellinger EXPORT_SYMBOL(sbc_dif_verify_read); 1455