1d6e0175cSChristoph Hellwig /* 2d6e0175cSChristoph Hellwig * SCSI Block Commands (SBC) parsing and emulation. 3d6e0175cSChristoph Hellwig * 4d6e0175cSChristoph Hellwig * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. 5d6e0175cSChristoph Hellwig * Copyright (c) 2005, 2006, 2007 SBE, Inc. 6d6e0175cSChristoph Hellwig * Copyright (c) 2007-2010 Rising Tide Systems 7d6e0175cSChristoph Hellwig * Copyright (c) 2008-2010 Linux-iSCSI.org 8d6e0175cSChristoph Hellwig * 9d6e0175cSChristoph Hellwig * Nicholas A. Bellinger <nab@kernel.org> 10d6e0175cSChristoph Hellwig * 11d6e0175cSChristoph Hellwig * This program is free software; you can redistribute it and/or modify 12d6e0175cSChristoph Hellwig * it under the terms of the GNU General Public License as published by 13d6e0175cSChristoph Hellwig * the Free Software Foundation; either version 2 of the License, or 14d6e0175cSChristoph Hellwig * (at your option) any later version. 15d6e0175cSChristoph Hellwig * 16d6e0175cSChristoph Hellwig * This program is distributed in the hope that it will be useful, 17d6e0175cSChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 18d6e0175cSChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19d6e0175cSChristoph Hellwig * GNU General Public License for more details. 20d6e0175cSChristoph Hellwig * 21d6e0175cSChristoph Hellwig * You should have received a copy of the GNU General Public License 22d6e0175cSChristoph Hellwig * along with this program; if not, write to the Free Software 23d6e0175cSChristoph Hellwig * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24d6e0175cSChristoph Hellwig */ 25d6e0175cSChristoph Hellwig 26d6e0175cSChristoph Hellwig #include <linux/kernel.h> 27d6e0175cSChristoph Hellwig #include <linux/module.h> 28d6e0175cSChristoph Hellwig #include <linux/ratelimit.h> 29d6e0175cSChristoph Hellwig #include <asm/unaligned.h> 30d6e0175cSChristoph Hellwig #include <scsi/scsi.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" 38d6e0175cSChristoph Hellwig 39d6e0175cSChristoph Hellwig 40de103c93SChristoph Hellwig static sense_reason_t 41de103c93SChristoph Hellwig sbc_emulate_readcapacity(struct se_cmd *cmd) 421fd032eeSChristoph Hellwig { 431fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 441fd032eeSChristoph Hellwig unsigned long long blocks_long = dev->transport->get_blocks(dev); 45a50da144SPaolo Bonzini unsigned char *rbuf; 46a50da144SPaolo Bonzini unsigned char buf[8]; 471fd032eeSChristoph Hellwig u32 blocks; 481fd032eeSChristoph Hellwig 491fd032eeSChristoph Hellwig if (blocks_long >= 0x00000000ffffffff) 501fd032eeSChristoph Hellwig blocks = 0xffffffff; 511fd032eeSChristoph Hellwig else 521fd032eeSChristoph Hellwig blocks = (u32)blocks_long; 531fd032eeSChristoph Hellwig 541fd032eeSChristoph Hellwig buf[0] = (blocks >> 24) & 0xff; 551fd032eeSChristoph Hellwig buf[1] = (blocks >> 16) & 0xff; 561fd032eeSChristoph Hellwig buf[2] = (blocks >> 8) & 0xff; 571fd032eeSChristoph Hellwig buf[3] = blocks & 0xff; 580fd97ccfSChristoph Hellwig buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; 590fd97ccfSChristoph Hellwig buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; 600fd97ccfSChristoph Hellwig buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; 610fd97ccfSChristoph Hellwig buf[7] = dev->dev_attrib.block_size & 0xff; 621fd032eeSChristoph Hellwig 63a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 64de103c93SChristoph Hellwig if (!rbuf) 65de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 66de103c93SChristoph Hellwig 67a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 681fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 691fd032eeSChristoph Hellwig 701fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 711fd032eeSChristoph Hellwig return 0; 721fd032eeSChristoph Hellwig } 731fd032eeSChristoph Hellwig 74de103c93SChristoph Hellwig static sense_reason_t 75de103c93SChristoph Hellwig sbc_emulate_readcapacity_16(struct se_cmd *cmd) 761fd032eeSChristoph Hellwig { 771fd032eeSChristoph Hellwig struct se_device *dev = cmd->se_dev; 78a50da144SPaolo Bonzini unsigned char *rbuf; 79a50da144SPaolo Bonzini unsigned char buf[32]; 801fd032eeSChristoph Hellwig unsigned long long blocks = dev->transport->get_blocks(dev); 811fd032eeSChristoph Hellwig 82a50da144SPaolo Bonzini memset(buf, 0, sizeof(buf)); 831fd032eeSChristoph Hellwig buf[0] = (blocks >> 56) & 0xff; 841fd032eeSChristoph Hellwig buf[1] = (blocks >> 48) & 0xff; 851fd032eeSChristoph Hellwig buf[2] = (blocks >> 40) & 0xff; 861fd032eeSChristoph Hellwig buf[3] = (blocks >> 32) & 0xff; 871fd032eeSChristoph Hellwig buf[4] = (blocks >> 24) & 0xff; 881fd032eeSChristoph Hellwig buf[5] = (blocks >> 16) & 0xff; 891fd032eeSChristoph Hellwig buf[6] = (blocks >> 8) & 0xff; 901fd032eeSChristoph Hellwig buf[7] = blocks & 0xff; 910fd97ccfSChristoph Hellwig buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; 920fd97ccfSChristoph Hellwig buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; 930fd97ccfSChristoph Hellwig buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; 940fd97ccfSChristoph Hellwig buf[11] = dev->dev_attrib.block_size & 0xff; 951fd032eeSChristoph Hellwig /* 961fd032eeSChristoph Hellwig * Set Thin Provisioning Enable bit following sbc3r22 in section 971fd032eeSChristoph Hellwig * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. 981fd032eeSChristoph Hellwig */ 990fd97ccfSChristoph Hellwig if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) 1001fd032eeSChristoph Hellwig buf[14] = 0x80; 1011fd032eeSChristoph Hellwig 102a50da144SPaolo Bonzini rbuf = transport_kmap_data_sg(cmd); 103de103c93SChristoph Hellwig if (!rbuf) 104de103c93SChristoph Hellwig return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 105de103c93SChristoph Hellwig 106a50da144SPaolo Bonzini memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); 1071fd032eeSChristoph Hellwig transport_kunmap_data_sg(cmd); 1081fd032eeSChristoph Hellwig 1091fd032eeSChristoph Hellwig target_complete_cmd(cmd, GOOD); 1101fd032eeSChristoph Hellwig return 0; 1111fd032eeSChristoph Hellwig } 1121fd032eeSChristoph Hellwig 1136f974e8cSChristoph Hellwig int spc_get_write_same_sectors(struct se_cmd *cmd) 1141fd032eeSChristoph Hellwig { 1151fd032eeSChristoph Hellwig u32 num_blocks; 1161fd032eeSChristoph Hellwig 1171fd032eeSChristoph Hellwig if (cmd->t_task_cdb[0] == WRITE_SAME) 1181fd032eeSChristoph Hellwig num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); 1191fd032eeSChristoph Hellwig else if (cmd->t_task_cdb[0] == WRITE_SAME_16) 1201fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); 1211fd032eeSChristoph Hellwig else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ 1221fd032eeSChristoph Hellwig num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); 1231fd032eeSChristoph Hellwig 1241fd032eeSChristoph Hellwig /* 1251fd032eeSChristoph Hellwig * Use the explicit range when non zero is supplied, otherwise calculate 1261fd032eeSChristoph Hellwig * the remaining range based on ->get_blocks() - starting LBA. 1271fd032eeSChristoph Hellwig */ 1286f974e8cSChristoph Hellwig if (num_blocks) 1296f974e8cSChristoph Hellwig return num_blocks; 1301fd032eeSChristoph Hellwig 1316f974e8cSChristoph Hellwig return cmd->se_dev->transport->get_blocks(cmd->se_dev) - 1326f974e8cSChristoph Hellwig cmd->t_task_lba + 1; 1331fd032eeSChristoph Hellwig } 1346f974e8cSChristoph Hellwig EXPORT_SYMBOL(spc_get_write_same_sectors); 1351fd032eeSChristoph Hellwig 136de103c93SChristoph Hellwig static sense_reason_t 1371920ed61SNicholas Bellinger sbc_emulate_noop(struct se_cmd *cmd) 1381a1ff38cSBernhard Kohl { 1391a1ff38cSBernhard Kohl target_complete_cmd(cmd, GOOD); 1401a1ff38cSBernhard Kohl return 0; 1411a1ff38cSBernhard Kohl } 1421a1ff38cSBernhard Kohl 143d6e0175cSChristoph Hellwig static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) 144d6e0175cSChristoph Hellwig { 1450fd97ccfSChristoph Hellwig return cmd->se_dev->dev_attrib.block_size * sectors; 146d6e0175cSChristoph Hellwig } 147d6e0175cSChristoph Hellwig 148d6e0175cSChristoph Hellwig static int sbc_check_valid_sectors(struct se_cmd *cmd) 149d6e0175cSChristoph Hellwig { 150d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 151d6e0175cSChristoph Hellwig unsigned long long end_lba; 152d6e0175cSChristoph Hellwig u32 sectors; 153d6e0175cSChristoph Hellwig 1540fd97ccfSChristoph Hellwig sectors = cmd->data_length / dev->dev_attrib.block_size; 155d6e0175cSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 156d6e0175cSChristoph Hellwig 157d6e0175cSChristoph Hellwig if (cmd->t_task_lba + sectors > end_lba) { 158d6e0175cSChristoph Hellwig pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", 159d6e0175cSChristoph Hellwig cmd->t_task_lba, sectors, end_lba); 160d6e0175cSChristoph Hellwig return -EINVAL; 161d6e0175cSChristoph Hellwig } 162d6e0175cSChristoph Hellwig 163d6e0175cSChristoph Hellwig return 0; 164d6e0175cSChristoph Hellwig } 165d6e0175cSChristoph Hellwig 166d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_6(unsigned char *cdb) 167d6e0175cSChristoph Hellwig { 168d6e0175cSChristoph Hellwig /* 169d6e0175cSChristoph Hellwig * Use 8-bit sector value. SBC-3 says: 170d6e0175cSChristoph Hellwig * 171d6e0175cSChristoph Hellwig * A TRANSFER LENGTH field set to zero specifies that 256 172d6e0175cSChristoph Hellwig * logical blocks shall be written. Any other value 173d6e0175cSChristoph Hellwig * specifies the number of logical blocks that shall be 174d6e0175cSChristoph Hellwig * written. 175d6e0175cSChristoph Hellwig */ 176d6e0175cSChristoph Hellwig return cdb[4] ? : 256; 177d6e0175cSChristoph Hellwig } 178d6e0175cSChristoph Hellwig 179d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_10(unsigned char *cdb) 180d6e0175cSChristoph Hellwig { 181d6e0175cSChristoph Hellwig return (u32)(cdb[7] << 8) + cdb[8]; 182d6e0175cSChristoph Hellwig } 183d6e0175cSChristoph Hellwig 184d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_12(unsigned char *cdb) 185d6e0175cSChristoph Hellwig { 186d6e0175cSChristoph Hellwig return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; 187d6e0175cSChristoph Hellwig } 188d6e0175cSChristoph Hellwig 189d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_16(unsigned char *cdb) 190d6e0175cSChristoph Hellwig { 191d6e0175cSChristoph Hellwig return (u32)(cdb[10] << 24) + (cdb[11] << 16) + 192d6e0175cSChristoph Hellwig (cdb[12] << 8) + cdb[13]; 193d6e0175cSChristoph Hellwig } 194d6e0175cSChristoph Hellwig 195d6e0175cSChristoph Hellwig /* 196d6e0175cSChristoph Hellwig * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants 197d6e0175cSChristoph Hellwig */ 198d6e0175cSChristoph Hellwig static inline u32 transport_get_sectors_32(unsigned char *cdb) 199d6e0175cSChristoph Hellwig { 200d6e0175cSChristoph Hellwig return (u32)(cdb[28] << 24) + (cdb[29] << 16) + 201d6e0175cSChristoph Hellwig (cdb[30] << 8) + cdb[31]; 202d6e0175cSChristoph Hellwig 203d6e0175cSChristoph Hellwig } 204d6e0175cSChristoph Hellwig 205d6e0175cSChristoph Hellwig static inline u32 transport_lba_21(unsigned char *cdb) 206d6e0175cSChristoph Hellwig { 207d6e0175cSChristoph Hellwig return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; 208d6e0175cSChristoph Hellwig } 209d6e0175cSChristoph Hellwig 210d6e0175cSChristoph Hellwig static inline u32 transport_lba_32(unsigned char *cdb) 211d6e0175cSChristoph Hellwig { 212d6e0175cSChristoph Hellwig return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 213d6e0175cSChristoph Hellwig } 214d6e0175cSChristoph Hellwig 215d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64(unsigned char *cdb) 216d6e0175cSChristoph Hellwig { 217d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 218d6e0175cSChristoph Hellwig 219d6e0175cSChristoph Hellwig __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; 220d6e0175cSChristoph Hellwig __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; 221d6e0175cSChristoph Hellwig 222d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 223d6e0175cSChristoph Hellwig } 224d6e0175cSChristoph Hellwig 225d6e0175cSChristoph Hellwig /* 226d6e0175cSChristoph Hellwig * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs 227d6e0175cSChristoph Hellwig */ 228d6e0175cSChristoph Hellwig static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) 229d6e0175cSChristoph Hellwig { 230d6e0175cSChristoph Hellwig unsigned int __v1, __v2; 231d6e0175cSChristoph Hellwig 232d6e0175cSChristoph Hellwig __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; 233d6e0175cSChristoph Hellwig __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; 234d6e0175cSChristoph Hellwig 235d6e0175cSChristoph Hellwig return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; 236d6e0175cSChristoph Hellwig } 237d6e0175cSChristoph Hellwig 238cd063befSNicholas Bellinger static sense_reason_t 239cd063befSNicholas Bellinger sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) 240d6e0175cSChristoph Hellwig { 241773cbaf7SNicholas Bellinger unsigned int sectors = spc_get_write_same_sectors(cmd); 242773cbaf7SNicholas Bellinger 243d6e0175cSChristoph Hellwig if ((flags[0] & 0x04) || (flags[0] & 0x02)) { 244d6e0175cSChristoph Hellwig pr_err("WRITE_SAME PBDATA and LBDATA" 245d6e0175cSChristoph Hellwig " bits not supported for Block Discard" 246d6e0175cSChristoph Hellwig " Emulation\n"); 247cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 248d6e0175cSChristoph Hellwig } 249773cbaf7SNicholas Bellinger if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { 250773cbaf7SNicholas Bellinger pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", 251773cbaf7SNicholas Bellinger sectors, cmd->se_dev->dev_attrib.max_write_same_len); 252773cbaf7SNicholas Bellinger return TCM_INVALID_CDB_FIELD; 253773cbaf7SNicholas Bellinger } 254d6e0175cSChristoph Hellwig /* 255cd063befSNicholas Bellinger * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting 256cd063befSNicholas Bellinger * translated into block discard requests within backend code. 257d6e0175cSChristoph Hellwig */ 258cd063befSNicholas Bellinger if (flags[0] & 0x08) { 259cd063befSNicholas Bellinger if (!ops->execute_write_same_unmap) 260cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 261d6e0175cSChristoph Hellwig 262cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same_unmap; 263cd063befSNicholas Bellinger return 0; 264cd063befSNicholas Bellinger } 265cd063befSNicholas Bellinger if (!ops->execute_write_same) 266cd063befSNicholas Bellinger return TCM_UNSUPPORTED_SCSI_OPCODE; 267cd063befSNicholas Bellinger 268cd063befSNicholas Bellinger cmd->execute_cmd = ops->execute_write_same; 269d6e0175cSChristoph Hellwig return 0; 270d6e0175cSChristoph Hellwig } 271d6e0175cSChristoph Hellwig 272d6e0175cSChristoph Hellwig static void xdreadwrite_callback(struct se_cmd *cmd) 273d6e0175cSChristoph Hellwig { 274d6e0175cSChristoph Hellwig unsigned char *buf, *addr; 275d6e0175cSChristoph Hellwig struct scatterlist *sg; 276d6e0175cSChristoph Hellwig unsigned int offset; 277d6e0175cSChristoph Hellwig int i; 278d6e0175cSChristoph Hellwig int count; 279d6e0175cSChristoph Hellwig /* 280d6e0175cSChristoph Hellwig * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command 281d6e0175cSChristoph Hellwig * 282d6e0175cSChristoph Hellwig * 1) read the specified logical block(s); 283d6e0175cSChristoph Hellwig * 2) transfer logical blocks from the data-out buffer; 284d6e0175cSChristoph Hellwig * 3) XOR the logical blocks transferred from the data-out buffer with 285d6e0175cSChristoph Hellwig * the logical blocks read, storing the resulting XOR data in a buffer; 286d6e0175cSChristoph Hellwig * 4) if the DISABLE WRITE bit is set to zero, then write the logical 287d6e0175cSChristoph Hellwig * blocks transferred from the data-out buffer; and 288d6e0175cSChristoph Hellwig * 5) transfer the resulting XOR data to the data-in buffer. 289d6e0175cSChristoph Hellwig */ 290d6e0175cSChristoph Hellwig buf = kmalloc(cmd->data_length, GFP_KERNEL); 291d6e0175cSChristoph Hellwig if (!buf) { 292d6e0175cSChristoph Hellwig pr_err("Unable to allocate xor_callback buf\n"); 293d6e0175cSChristoph Hellwig return; 294d6e0175cSChristoph Hellwig } 295d6e0175cSChristoph Hellwig /* 296d6e0175cSChristoph Hellwig * Copy the scatterlist WRITE buffer located at cmd->t_data_sg 297d6e0175cSChristoph Hellwig * into the locally allocated *buf 298d6e0175cSChristoph Hellwig */ 299d6e0175cSChristoph Hellwig sg_copy_to_buffer(cmd->t_data_sg, 300d6e0175cSChristoph Hellwig cmd->t_data_nents, 301d6e0175cSChristoph Hellwig buf, 302d6e0175cSChristoph Hellwig cmd->data_length); 303d6e0175cSChristoph Hellwig 304d6e0175cSChristoph Hellwig /* 305d6e0175cSChristoph Hellwig * Now perform the XOR against the BIDI read memory located at 306d6e0175cSChristoph Hellwig * cmd->t_mem_bidi_list 307d6e0175cSChristoph Hellwig */ 308d6e0175cSChristoph Hellwig 309d6e0175cSChristoph Hellwig offset = 0; 310d6e0175cSChristoph Hellwig for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { 311d6e0175cSChristoph Hellwig addr = kmap_atomic(sg_page(sg)); 312d6e0175cSChristoph Hellwig if (!addr) 313d6e0175cSChristoph Hellwig goto out; 314d6e0175cSChristoph Hellwig 315d6e0175cSChristoph Hellwig for (i = 0; i < sg->length; i++) 316d6e0175cSChristoph Hellwig *(addr + sg->offset + i) ^= *(buf + offset + i); 317d6e0175cSChristoph Hellwig 318d6e0175cSChristoph Hellwig offset += sg->length; 319d6e0175cSChristoph Hellwig kunmap_atomic(addr); 320d6e0175cSChristoph Hellwig } 321d6e0175cSChristoph Hellwig 322d6e0175cSChristoph Hellwig out: 323d6e0175cSChristoph Hellwig kfree(buf); 324d6e0175cSChristoph Hellwig } 325d6e0175cSChristoph Hellwig 326de103c93SChristoph Hellwig sense_reason_t 327de103c93SChristoph Hellwig sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) 328d6e0175cSChristoph Hellwig { 329d6e0175cSChristoph Hellwig struct se_device *dev = cmd->se_dev; 330d6e0175cSChristoph Hellwig unsigned char *cdb = cmd->t_task_cdb; 3311fd032eeSChristoph Hellwig unsigned int size; 332d6e0175cSChristoph Hellwig u32 sectors = 0; 333de103c93SChristoph Hellwig sense_reason_t ret; 334d6e0175cSChristoph Hellwig 335d6e0175cSChristoph Hellwig switch (cdb[0]) { 336d6e0175cSChristoph Hellwig case READ_6: 337d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 338d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 339d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3400c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 341d6e0175cSChristoph Hellwig break; 342d6e0175cSChristoph Hellwig case READ_10: 343d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 344d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 345d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3460c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 347d6e0175cSChristoph Hellwig break; 348d6e0175cSChristoph Hellwig case READ_12: 349d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 350d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 351d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3520c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 353d6e0175cSChristoph Hellwig break; 354d6e0175cSChristoph Hellwig case READ_16: 355d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 356d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 357d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3580c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 359d6e0175cSChristoph Hellwig break; 360d6e0175cSChristoph Hellwig case WRITE_6: 361d6e0175cSChristoph Hellwig sectors = transport_get_sectors_6(cdb); 362d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_21(cdb); 363d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3640c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 365d6e0175cSChristoph Hellwig break; 366d6e0175cSChristoph Hellwig case WRITE_10: 367d6e0175cSChristoph Hellwig case WRITE_VERIFY: 368d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 369d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 370d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 371d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 372d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3730c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 374d6e0175cSChristoph Hellwig break; 375d6e0175cSChristoph Hellwig case WRITE_12: 376d6e0175cSChristoph Hellwig sectors = transport_get_sectors_12(cdb); 377d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 378d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 379d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 380d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3810c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 382d6e0175cSChristoph Hellwig break; 383d6e0175cSChristoph Hellwig case WRITE_16: 384d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 385d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 386d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 387d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 388d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 3890c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 390d6e0175cSChristoph Hellwig break; 391d6e0175cSChristoph Hellwig case XDWRITEREAD_10: 392de103c93SChristoph Hellwig if (cmd->data_direction != DMA_TO_DEVICE || 393d6e0175cSChristoph Hellwig !(cmd->se_cmd_flags & SCF_BIDI)) 394de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 395d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 396d6e0175cSChristoph Hellwig 397d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 398d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 399d6e0175cSChristoph Hellwig 400d6e0175cSChristoph Hellwig /* 401d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run after I/O completion. 402d6e0175cSChristoph Hellwig */ 4030c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 404d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 405d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 406d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 407d6e0175cSChristoph Hellwig break; 408d6e0175cSChristoph Hellwig case VARIABLE_LENGTH_CMD: 409d6e0175cSChristoph Hellwig { 410d6e0175cSChristoph Hellwig u16 service_action = get_unaligned_be16(&cdb[8]); 411d6e0175cSChristoph Hellwig switch (service_action) { 412d6e0175cSChristoph Hellwig case XDWRITEREAD_32: 413d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 414d6e0175cSChristoph Hellwig 415d6e0175cSChristoph Hellwig /* 416d6e0175cSChristoph Hellwig * Use WRITE_32 and READ_32 opcodes for the emulated 417d6e0175cSChristoph Hellwig * XDWRITE_READ_32 logic. 418d6e0175cSChristoph Hellwig */ 419d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64_ext(cdb); 420d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; 421d6e0175cSChristoph Hellwig 422d6e0175cSChristoph Hellwig /* 423d6e0175cSChristoph Hellwig * Setup BIDI XOR callback to be run during after I/O 424d6e0175cSChristoph Hellwig * completion. 425d6e0175cSChristoph Hellwig */ 4260c2ad7d1SChristoph Hellwig cmd->execute_cmd = ops->execute_rw; 427d6e0175cSChristoph Hellwig cmd->transport_complete_callback = &xdreadwrite_callback; 428d6e0175cSChristoph Hellwig if (cdb[1] & 0x8) 429d6e0175cSChristoph Hellwig cmd->se_cmd_flags |= SCF_FUA; 430d6e0175cSChristoph Hellwig break; 431d6e0175cSChristoph Hellwig case WRITE_SAME_32: 432d6e0175cSChristoph Hellwig sectors = transport_get_sectors_32(cdb); 433d6e0175cSChristoph Hellwig if (!sectors) { 434d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" 435d6e0175cSChristoph Hellwig " supported\n"); 436de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 437d6e0175cSChristoph Hellwig } 438d6e0175cSChristoph Hellwig 4391fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 440d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[12]); 441d6e0175cSChristoph Hellwig 442cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[10], ops); 443cd063befSNicholas Bellinger if (ret < 0) 444cd063befSNicholas Bellinger return ret; 445d6e0175cSChristoph Hellwig break; 446d6e0175cSChristoph Hellwig default: 447d6e0175cSChristoph Hellwig pr_err("VARIABLE_LENGTH_CMD service action" 448d6e0175cSChristoph Hellwig " 0x%04x not supported\n", service_action); 449de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 450d6e0175cSChristoph Hellwig } 451d6e0175cSChristoph Hellwig break; 452d6e0175cSChristoph Hellwig } 453d6e0175cSChristoph Hellwig case READ_CAPACITY: 4541fd032eeSChristoph Hellwig size = READ_CAP_LEN; 4551fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity; 456d6e0175cSChristoph Hellwig break; 457d6e0175cSChristoph Hellwig case SERVICE_ACTION_IN: 458d6e0175cSChristoph Hellwig switch (cmd->t_task_cdb[1] & 0x1f) { 459d6e0175cSChristoph Hellwig case SAI_READ_CAPACITY_16: 4601fd032eeSChristoph Hellwig cmd->execute_cmd = sbc_emulate_readcapacity_16; 461d6e0175cSChristoph Hellwig break; 462d6e0175cSChristoph Hellwig default: 463d6e0175cSChristoph Hellwig pr_err("Unsupported SA: 0x%02x\n", 464d6e0175cSChristoph Hellwig cmd->t_task_cdb[1] & 0x1f); 465de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 466d6e0175cSChristoph Hellwig } 4671fd032eeSChristoph Hellwig size = (cdb[10] << 24) | (cdb[11] << 16) | 468d6e0175cSChristoph Hellwig (cdb[12] << 8) | cdb[13]; 469d6e0175cSChristoph Hellwig break; 470d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE: 471d6e0175cSChristoph Hellwig case SYNCHRONIZE_CACHE_16: 472ad67f0d9SChristoph Hellwig if (!ops->execute_sync_cache) 473de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 474ad67f0d9SChristoph Hellwig 475d6e0175cSChristoph Hellwig /* 476d6e0175cSChristoph Hellwig * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE 477d6e0175cSChristoph Hellwig */ 478d6e0175cSChristoph Hellwig if (cdb[0] == SYNCHRONIZE_CACHE) { 479d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 480d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_32(cdb); 481d6e0175cSChristoph Hellwig } else { 482d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 483d6e0175cSChristoph Hellwig cmd->t_task_lba = transport_lba_64(cdb); 484d6e0175cSChristoph Hellwig } 485d6e0175cSChristoph Hellwig 4861fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 487d6e0175cSChristoph Hellwig 488d6e0175cSChristoph Hellwig /* 489d6e0175cSChristoph Hellwig * Check to ensure that LBA + Range does not exceed past end of 490d6e0175cSChristoph Hellwig * device for IBLOCK and FILEIO ->do_sync_cache() backend calls 491d6e0175cSChristoph Hellwig */ 492d6e0175cSChristoph Hellwig if (cmd->t_task_lba || sectors) { 493d6e0175cSChristoph Hellwig if (sbc_check_valid_sectors(cmd) < 0) 494de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 495d6e0175cSChristoph Hellwig } 496ad67f0d9SChristoph Hellwig cmd->execute_cmd = ops->execute_sync_cache; 497d6e0175cSChristoph Hellwig break; 498d6e0175cSChristoph Hellwig case UNMAP: 49914150a6bSChristoph Hellwig if (!ops->execute_unmap) 500de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 50114150a6bSChristoph Hellwig 5021fd032eeSChristoph Hellwig size = get_unaligned_be16(&cdb[7]); 50314150a6bSChristoph Hellwig cmd->execute_cmd = ops->execute_unmap; 504d6e0175cSChristoph Hellwig break; 505d6e0175cSChristoph Hellwig case WRITE_SAME_16: 506d6e0175cSChristoph Hellwig sectors = transport_get_sectors_16(cdb); 507d6e0175cSChristoph Hellwig if (!sectors) { 508d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 509de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 510d6e0175cSChristoph Hellwig } 511d6e0175cSChristoph Hellwig 5121fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 513d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be64(&cdb[2]); 514d6e0175cSChristoph Hellwig 515cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 516cd063befSNicholas Bellinger if (ret < 0) 517cd063befSNicholas Bellinger return ret; 518d6e0175cSChristoph Hellwig break; 519d6e0175cSChristoph Hellwig case WRITE_SAME: 520d6e0175cSChristoph Hellwig sectors = transport_get_sectors_10(cdb); 521d6e0175cSChristoph Hellwig if (!sectors) { 522d6e0175cSChristoph Hellwig pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); 523de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 524d6e0175cSChristoph Hellwig } 525d6e0175cSChristoph Hellwig 5261fd032eeSChristoph Hellwig size = sbc_get_size(cmd, 1); 527d6e0175cSChristoph Hellwig cmd->t_task_lba = get_unaligned_be32(&cdb[2]); 528d6e0175cSChristoph Hellwig 529d6e0175cSChristoph Hellwig /* 530d6e0175cSChristoph Hellwig * Follow sbcr26 with WRITE_SAME (10) and check for the existence 531d6e0175cSChristoph Hellwig * of byte 1 bit 3 UNMAP instead of original reserved field 532d6e0175cSChristoph Hellwig */ 533cd063befSNicholas Bellinger ret = sbc_setup_write_same(cmd, &cdb[1], ops); 534cd063befSNicholas Bellinger if (ret < 0) 535cd063befSNicholas Bellinger return ret; 536d6e0175cSChristoph Hellwig break; 537d6e0175cSChristoph Hellwig case VERIFY: 5381fd032eeSChristoph Hellwig size = 0; 5391920ed61SNicholas Bellinger cmd->execute_cmd = sbc_emulate_noop; 540d6e0175cSChristoph Hellwig break; 5411a1ff38cSBernhard Kohl case REZERO_UNIT: 5421a1ff38cSBernhard Kohl case SEEK_6: 5431a1ff38cSBernhard Kohl case SEEK_10: 5441a1ff38cSBernhard Kohl /* 5451a1ff38cSBernhard Kohl * There are still clients out there which use these old SCSI-2 5461a1ff38cSBernhard Kohl * commands. This mainly happens when running VMs with legacy 5471a1ff38cSBernhard Kohl * guest systems, connected via SCSI command pass-through to 5481a1ff38cSBernhard Kohl * iSCSI targets. Make them happy and return status GOOD. 5491a1ff38cSBernhard Kohl */ 5501a1ff38cSBernhard Kohl size = 0; 5511a1ff38cSBernhard Kohl cmd->execute_cmd = sbc_emulate_noop; 5521a1ff38cSBernhard Kohl break; 553d6e0175cSChristoph Hellwig default: 5541fd032eeSChristoph Hellwig ret = spc_parse_cdb(cmd, &size); 555d6e0175cSChristoph Hellwig if (ret) 556d6e0175cSChristoph Hellwig return ret; 557d6e0175cSChristoph Hellwig } 558d6e0175cSChristoph Hellwig 559d6e0175cSChristoph Hellwig /* reject any command that we don't have a handler for */ 560d6e0175cSChristoph Hellwig if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) 561de103c93SChristoph Hellwig return TCM_UNSUPPORTED_SCSI_OPCODE; 562d6e0175cSChristoph Hellwig 563d6e0175cSChristoph Hellwig if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { 5641fd032eeSChristoph Hellwig unsigned long long end_lba; 5651fd032eeSChristoph Hellwig 5660fd97ccfSChristoph Hellwig if (sectors > dev->dev_attrib.fabric_max_sectors) { 567d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 568d6e0175cSChristoph Hellwig " big sectors %u exceeds fabric_max_sectors:" 569d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 5700fd97ccfSChristoph Hellwig dev->dev_attrib.fabric_max_sectors); 571de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 572d6e0175cSChristoph Hellwig } 5730fd97ccfSChristoph Hellwig if (sectors > dev->dev_attrib.hw_max_sectors) { 574d6e0175cSChristoph Hellwig printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" 575d6e0175cSChristoph Hellwig " big sectors %u exceeds backend hw_max_sectors:" 576d6e0175cSChristoph Hellwig " %u\n", cdb[0], sectors, 5770fd97ccfSChristoph Hellwig dev->dev_attrib.hw_max_sectors); 578de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 579d6e0175cSChristoph Hellwig } 580d6e0175cSChristoph Hellwig 5811fd032eeSChristoph Hellwig end_lba = dev->transport->get_blocks(dev) + 1; 5821fd032eeSChristoph Hellwig if (cmd->t_task_lba + sectors > end_lba) { 5831fd032eeSChristoph Hellwig pr_err("cmd exceeds last lba %llu " 5841fd032eeSChristoph Hellwig "(lba %llu, sectors %u)\n", 5851fd032eeSChristoph Hellwig end_lba, cmd->t_task_lba, sectors); 586de103c93SChristoph Hellwig return TCM_INVALID_CDB_FIELD; 587d6e0175cSChristoph Hellwig } 588d6e0175cSChristoph Hellwig 5891fd032eeSChristoph Hellwig size = sbc_get_size(cmd, sectors); 5901fd032eeSChristoph Hellwig } 5911fd032eeSChristoph Hellwig 592de103c93SChristoph Hellwig return target_cmd_size_check(cmd, size); 593d6e0175cSChristoph Hellwig } 594d6e0175cSChristoph Hellwig EXPORT_SYMBOL(sbc_parse_cdb); 5956f23ac8aSChristoph Hellwig 5966f23ac8aSChristoph Hellwig u32 sbc_get_device_type(struct se_device *dev) 5976f23ac8aSChristoph Hellwig { 5986f23ac8aSChristoph Hellwig return TYPE_DISK; 5996f23ac8aSChristoph Hellwig } 6006f23ac8aSChristoph Hellwig EXPORT_SYMBOL(sbc_get_device_type); 601