Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * SCSI Block Commands (SBC) parsing and emulation. |
| 3 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 4 | * (c) Copyright 2002-2013 Datera, Inc. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 5 | * |
| 6 | * Nicholas A. Bellinger <nab@kernel.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/ratelimit.h> |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 26 | #include <linux/crc-t10dif.h> |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 27 | #include <asm/unaligned.h> |
| 28 | #include <scsi/scsi.h> |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 29 | #include <scsi/scsi_tcq.h> |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 30 | |
| 31 | #include <target/target_core_base.h> |
| 32 | #include <target/target_core_backend.h> |
| 33 | #include <target/target_core_fabric.h> |
| 34 | |
| 35 | #include "target_core_internal.h" |
| 36 | #include "target_core_ua.h" |
Hannes Reinecke | c66094b | 2013-12-17 09:18:49 +0100 | [diff] [blame] | 37 | #include "target_core_alua.h" |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 38 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 39 | static sense_reason_t |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 40 | sbc_check_prot(struct se_device *, struct se_cmd *, unsigned char *, u32, bool); |
| 41 | |
| 42 | static sense_reason_t |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 43 | sbc_emulate_readcapacity(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 44 | { |
| 45 | struct se_device *dev = cmd->se_dev; |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 46 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 47 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 48 | unsigned char *rbuf; |
| 49 | unsigned char buf[8]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 50 | u32 blocks; |
| 51 | |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 52 | /* |
| 53 | * SBC-2 says: |
| 54 | * If the PMI bit is set to zero and the LOGICAL BLOCK |
| 55 | * ADDRESS field is not set to zero, the device server shall |
| 56 | * terminate the command with CHECK CONDITION status with |
| 57 | * the sense key set to ILLEGAL REQUEST and the additional |
| 58 | * sense code set to INVALID FIELD IN CDB. |
| 59 | * |
| 60 | * In SBC-3, these fields are obsolete, but some SCSI |
| 61 | * compliance tests actually check this, so we might as well |
| 62 | * follow SBC-2. |
| 63 | */ |
| 64 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) |
| 65 | return TCM_INVALID_CDB_FIELD; |
| 66 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 67 | if (blocks_long >= 0x00000000ffffffff) |
| 68 | blocks = 0xffffffff; |
| 69 | else |
| 70 | blocks = (u32)blocks_long; |
| 71 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 72 | buf[0] = (blocks >> 24) & 0xff; |
| 73 | buf[1] = (blocks >> 16) & 0xff; |
| 74 | buf[2] = (blocks >> 8) & 0xff; |
| 75 | buf[3] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 76 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 77 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 78 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 79 | buf[7] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 80 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 81 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 82 | if (rbuf) { |
| 83 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 84 | transport_kunmap_data_sg(cmd); |
| 85 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 86 | |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 87 | target_complete_cmd_with_length(cmd, GOOD, 8); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 88 | return 0; |
| 89 | } |
| 90 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 91 | static sense_reason_t |
| 92 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 93 | { |
| 94 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | 2d33598 | 2014-04-02 13:34:04 -0700 | [diff] [blame] | 95 | struct se_session *sess = cmd->se_sess; |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 96 | unsigned char *rbuf; |
| 97 | unsigned char buf[32]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 98 | unsigned long long blocks = dev->transport->get_blocks(dev); |
| 99 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 100 | memset(buf, 0, sizeof(buf)); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 101 | buf[0] = (blocks >> 56) & 0xff; |
| 102 | buf[1] = (blocks >> 48) & 0xff; |
| 103 | buf[2] = (blocks >> 40) & 0xff; |
| 104 | buf[3] = (blocks >> 32) & 0xff; |
| 105 | buf[4] = (blocks >> 24) & 0xff; |
| 106 | buf[5] = (blocks >> 16) & 0xff; |
| 107 | buf[6] = (blocks >> 8) & 0xff; |
| 108 | buf[7] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 109 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 110 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 111 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 112 | buf[11] = dev->dev_attrib.block_size & 0xff; |
Nicholas Bellinger | 56dac14 | 2013-12-23 20:36:09 +0000 | [diff] [blame] | 113 | /* |
| 114 | * Set P_TYPE and PROT_EN bits for DIF support |
| 115 | */ |
Nicholas Bellinger | 2d33598 | 2014-04-02 13:34:04 -0700 | [diff] [blame] | 116 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
| 117 | if (dev->dev_attrib.pi_prot_type) |
| 118 | buf[12] = (dev->dev_attrib.pi_prot_type - 1) << 1 | 0x1; |
| 119 | } |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 120 | |
| 121 | if (dev->transport->get_lbppbe) |
| 122 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; |
| 123 | |
| 124 | if (dev->transport->get_alignment_offset_lbas) { |
| 125 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); |
| 126 | buf[14] = (lalba >> 8) & 0x3f; |
| 127 | buf[15] = lalba & 0xff; |
| 128 | } |
| 129 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 130 | /* |
| 131 | * Set Thin Provisioning Enable bit following sbc3r22 in section |
| 132 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| 133 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 134 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 135 | buf[14] |= 0x80; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 136 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 137 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 138 | if (rbuf) { |
| 139 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 140 | transport_kunmap_data_sg(cmd); |
| 141 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 142 | |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 143 | target_complete_cmd_with_length(cmd, GOOD, 32); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 144 | return 0; |
| 145 | } |
| 146 | |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 147 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 148 | { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 149 | u32 num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 150 | |
| 151 | if (cmd->t_task_cdb[0] == WRITE_SAME) |
| 152 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| 153 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| 154 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| 155 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| 156 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| 157 | |
| 158 | /* |
| 159 | * Use the explicit range when non zero is supplied, otherwise calculate |
| 160 | * the remaining range based on ->get_blocks() - starting LBA. |
| 161 | */ |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 162 | if (num_blocks) |
| 163 | return num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 164 | |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 165 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| 166 | cmd->t_task_lba + 1; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 167 | } |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 168 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 169 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 170 | static sense_reason_t |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 171 | sbc_emulate_noop(struct se_cmd *cmd) |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 172 | { |
| 173 | target_complete_cmd(cmd, GOOD); |
| 174 | return 0; |
| 175 | } |
| 176 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 177 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 178 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 179 | return cmd->se_dev->dev_attrib.block_size * sectors; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 180 | } |
| 181 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 182 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 183 | { |
| 184 | /* |
| 185 | * Use 8-bit sector value. SBC-3 says: |
| 186 | * |
| 187 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 188 | * logical blocks shall be written. Any other value |
| 189 | * specifies the number of logical blocks that shall be |
| 190 | * written. |
| 191 | */ |
| 192 | return cdb[4] ? : 256; |
| 193 | } |
| 194 | |
| 195 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 196 | { |
| 197 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 198 | } |
| 199 | |
| 200 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 201 | { |
| 202 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 203 | } |
| 204 | |
| 205 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 206 | { |
| 207 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 208 | (cdb[12] << 8) + cdb[13]; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 213 | */ |
| 214 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 215 | { |
| 216 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 217 | (cdb[30] << 8) + cdb[31]; |
| 218 | |
| 219 | } |
| 220 | |
| 221 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 222 | { |
| 223 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 224 | } |
| 225 | |
| 226 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 227 | { |
| 228 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 229 | } |
| 230 | |
| 231 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 232 | { |
| 233 | unsigned int __v1, __v2; |
| 234 | |
| 235 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 236 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 237 | |
| 238 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 243 | */ |
| 244 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 245 | { |
| 246 | unsigned int __v1, __v2; |
| 247 | |
| 248 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 249 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 250 | |
| 251 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 252 | } |
| 253 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 254 | static sense_reason_t |
| 255 | sbc_setup_write_same(struct se_cmd *cmd, unsigned char *flags, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 256 | { |
Nicholas Bellinger | 8e575c5 | 2015-02-13 22:09:47 +0000 | [diff] [blame] | 257 | struct se_device *dev = cmd->se_dev; |
| 258 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 259 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 260 | sense_reason_t ret; |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 261 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 262 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 263 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 264 | " bits not supported for Block Discard" |
| 265 | " Emulation\n"); |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 266 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 267 | } |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 268 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| 269 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| 270 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| 271 | return TCM_INVALID_CDB_FIELD; |
| 272 | } |
Nicholas Bellinger | 8e575c5 | 2015-02-13 22:09:47 +0000 | [diff] [blame] | 273 | /* |
| 274 | * Sanity check for LBA wrap and request past end of device. |
| 275 | */ |
| 276 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
| 277 | ((cmd->t_task_lba + sectors) > end_lba)) { |
| 278 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", |
| 279 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); |
| 280 | return TCM_ADDRESS_OUT_OF_RANGE; |
| 281 | } |
| 282 | |
Roland Dreier | 5cb770b | 2013-10-14 15:49:23 -0700 | [diff] [blame] | 283 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
| 284 | if (flags[0] & 0x10) { |
| 285 | pr_warn("WRITE SAME with ANCHOR not supported\n"); |
| 286 | return TCM_INVALID_CDB_FIELD; |
| 287 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 288 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 289 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 290 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 291 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 292 | if (flags[0] & 0x08) { |
| 293 | if (!ops->execute_write_same_unmap) |
| 294 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 295 | |
Nicholas Bellinger | d0a9129 | 2015-02-14 01:56:19 +0000 | [diff] [blame^] | 296 | if (!dev->dev_attrib.emulate_tpws) { |
| 297 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" |
| 298 | " has emulate_tpws disabled\n"); |
| 299 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 300 | } |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 301 | cmd->execute_cmd = ops->execute_write_same_unmap; |
| 302 | return 0; |
| 303 | } |
| 304 | if (!ops->execute_write_same) |
| 305 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 306 | |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 307 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
| 308 | if (ret) |
| 309 | return ret; |
| 310 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 311 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 312 | return 0; |
| 313 | } |
| 314 | |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 315 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 316 | { |
| 317 | unsigned char *buf, *addr; |
| 318 | struct scatterlist *sg; |
| 319 | unsigned int offset; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 320 | sense_reason_t ret = TCM_NO_SENSE; |
| 321 | int i, count; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 322 | /* |
| 323 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 324 | * |
| 325 | * 1) read the specified logical block(s); |
| 326 | * 2) transfer logical blocks from the data-out buffer; |
| 327 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 328 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 329 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 330 | * blocks transferred from the data-out buffer; and |
| 331 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 332 | */ |
| 333 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 334 | if (!buf) { |
| 335 | pr_err("Unable to allocate xor_callback buf\n"); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 336 | return TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 337 | } |
| 338 | /* |
| 339 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 340 | * into the locally allocated *buf |
| 341 | */ |
| 342 | sg_copy_to_buffer(cmd->t_data_sg, |
| 343 | cmd->t_data_nents, |
| 344 | buf, |
| 345 | cmd->data_length); |
| 346 | |
| 347 | /* |
| 348 | * Now perform the XOR against the BIDI read memory located at |
| 349 | * cmd->t_mem_bidi_list |
| 350 | */ |
| 351 | |
| 352 | offset = 0; |
| 353 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 354 | addr = kmap_atomic(sg_page(sg)); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 355 | if (!addr) { |
| 356 | ret = TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 357 | goto out; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 358 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 359 | |
| 360 | for (i = 0; i < sg->length; i++) |
| 361 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 362 | |
| 363 | offset += sg->length; |
| 364 | kunmap_atomic(addr); |
| 365 | } |
| 366 | |
| 367 | out: |
| 368 | kfree(buf); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 369 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 370 | } |
| 371 | |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 372 | static sense_reason_t |
| 373 | sbc_execute_rw(struct se_cmd *cmd) |
| 374 | { |
| 375 | return cmd->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, |
| 376 | cmd->data_direction); |
| 377 | } |
| 378 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 379 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd) |
| 380 | { |
| 381 | struct se_device *dev = cmd->se_dev; |
| 382 | |
Nicholas Bellinger | d8855c1 | 2013-10-01 16:53:10 -0700 | [diff] [blame] | 383 | /* |
| 384 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through |
| 385 | * within target_complete_ok_work() if the command was successfully |
| 386 | * sent to the backend driver. |
| 387 | */ |
| 388 | spin_lock_irq(&cmd->t_state_lock); |
| 389 | if ((cmd->transport_state & CMD_T_SENT) && !cmd->scsi_status) |
| 390 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
| 391 | spin_unlock_irq(&cmd->t_state_lock); |
| 392 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 393 | /* |
| 394 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() |
| 395 | * before the original READ I/O submission. |
| 396 | */ |
| 397 | up(&dev->caw_sem); |
| 398 | |
| 399 | return TCM_NO_SENSE; |
| 400 | } |
| 401 | |
| 402 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd) |
| 403 | { |
| 404 | struct se_device *dev = cmd->se_dev; |
| 405 | struct scatterlist *write_sg = NULL, *sg; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 406 | unsigned char *buf = NULL, *addr; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 407 | struct sg_mapping_iter m; |
| 408 | unsigned int offset = 0, len; |
| 409 | unsigned int nlbas = cmd->t_task_nolb; |
| 410 | unsigned int block_size = dev->dev_attrib.block_size; |
| 411 | unsigned int compare_len = (nlbas * block_size); |
| 412 | sense_reason_t ret = TCM_NO_SENSE; |
| 413 | int rc, i; |
| 414 | |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 415 | /* |
| 416 | * Handle early failure in transport_generic_request_failure(), |
| 417 | * which will not have taken ->caw_mutex yet.. |
| 418 | */ |
| 419 | if (!cmd->t_data_sg || !cmd->t_bidi_data_sg) |
| 420 | return TCM_NO_SENSE; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 421 | /* |
| 422 | * Immediately exit + release dev->caw_sem if command has already |
| 423 | * been failed with a non-zero SCSI status. |
| 424 | */ |
| 425 | if (cmd->scsi_status) { |
| 426 | pr_err("compare_and_write_callback: non zero scsi_status:" |
| 427 | " 0x%02x\n", cmd->scsi_status); |
| 428 | goto out; |
| 429 | } |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 430 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 431 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
| 432 | if (!buf) { |
| 433 | pr_err("Unable to allocate compare_and_write buf\n"); |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 434 | ret = TCM_OUT_OF_RESOURCES; |
| 435 | goto out; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 436 | } |
| 437 | |
Martin Svec | a1e1774 | 2014-04-01 16:03:02 +0200 | [diff] [blame] | 438 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 439 | GFP_KERNEL); |
| 440 | if (!write_sg) { |
| 441 | pr_err("Unable to allocate compare_and_write sg\n"); |
| 442 | ret = TCM_OUT_OF_RESOURCES; |
| 443 | goto out; |
| 444 | } |
Martin Svec | a1e1774 | 2014-04-01 16:03:02 +0200 | [diff] [blame] | 445 | sg_init_table(write_sg, cmd->t_data_nents); |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 446 | /* |
| 447 | * Setup verify and write data payloads from total NumberLBAs. |
| 448 | */ |
| 449 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, |
| 450 | cmd->data_length); |
| 451 | if (!rc) { |
| 452 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); |
| 453 | ret = TCM_OUT_OF_RESOURCES; |
| 454 | goto out; |
| 455 | } |
| 456 | /* |
| 457 | * Compare against SCSI READ payload against verify payload |
| 458 | */ |
| 459 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { |
| 460 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); |
| 461 | if (!addr) { |
| 462 | ret = TCM_OUT_OF_RESOURCES; |
| 463 | goto out; |
| 464 | } |
| 465 | |
| 466 | len = min(sg->length, compare_len); |
| 467 | |
| 468 | if (memcmp(addr, buf + offset, len)) { |
| 469 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", |
| 470 | addr, buf + offset); |
| 471 | kunmap_atomic(addr); |
| 472 | goto miscompare; |
| 473 | } |
| 474 | kunmap_atomic(addr); |
| 475 | |
| 476 | offset += len; |
| 477 | compare_len -= len; |
| 478 | if (!compare_len) |
| 479 | break; |
| 480 | } |
| 481 | |
| 482 | i = 0; |
| 483 | len = cmd->t_task_nolb * block_size; |
| 484 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); |
| 485 | /* |
| 486 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. |
| 487 | */ |
| 488 | while (len) { |
| 489 | sg_miter_next(&m); |
| 490 | |
| 491 | if (block_size < PAGE_SIZE) { |
| 492 | sg_set_page(&write_sg[i], m.page, block_size, |
| 493 | block_size); |
| 494 | } else { |
| 495 | sg_miter_next(&m); |
| 496 | sg_set_page(&write_sg[i], m.page, block_size, |
| 497 | 0); |
| 498 | } |
| 499 | len -= block_size; |
| 500 | i++; |
| 501 | } |
| 502 | sg_miter_stop(&m); |
| 503 | /* |
| 504 | * Save the original SGL + nents values before updating to new |
| 505 | * assignments, to be released in transport_free_pages() -> |
| 506 | * transport_reset_sgl_orig() |
| 507 | */ |
| 508 | cmd->t_data_sg_orig = cmd->t_data_sg; |
| 509 | cmd->t_data_sg = write_sg; |
| 510 | cmd->t_data_nents_orig = cmd->t_data_nents; |
| 511 | cmd->t_data_nents = 1; |
| 512 | |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 513 | cmd->sam_task_attr = TCM_HEAD_TAG; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 514 | cmd->transport_complete_callback = compare_and_write_post; |
| 515 | /* |
| 516 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler |
| 517 | * for submitting the adjusted SGL to write instance user-data. |
| 518 | */ |
| 519 | cmd->execute_cmd = sbc_execute_rw; |
| 520 | |
| 521 | spin_lock_irq(&cmd->t_state_lock); |
| 522 | cmd->t_state = TRANSPORT_PROCESSING; |
| 523 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
| 524 | spin_unlock_irq(&cmd->t_state_lock); |
| 525 | |
| 526 | __target_execute_cmd(cmd); |
| 527 | |
| 528 | kfree(buf); |
| 529 | return ret; |
| 530 | |
| 531 | miscompare: |
| 532 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", |
| 533 | dev->transport->name); |
| 534 | ret = TCM_MISCOMPARE_VERIFY; |
| 535 | out: |
| 536 | /* |
| 537 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in |
| 538 | * sbc_compare_and_write() before the original READ I/O submission. |
| 539 | */ |
| 540 | up(&dev->caw_sem); |
| 541 | kfree(write_sg); |
| 542 | kfree(buf); |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | static sense_reason_t |
| 547 | sbc_compare_and_write(struct se_cmd *cmd) |
| 548 | { |
| 549 | struct se_device *dev = cmd->se_dev; |
| 550 | sense_reason_t ret; |
| 551 | int rc; |
| 552 | /* |
| 553 | * Submit the READ first for COMPARE_AND_WRITE to perform the |
| 554 | * comparision using SGLs at cmd->t_bidi_data_sg.. |
| 555 | */ |
| 556 | rc = down_interruptible(&dev->caw_sem); |
| 557 | if ((rc != 0) || signal_pending(current)) { |
| 558 | cmd->transport_complete_callback = NULL; |
| 559 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 560 | } |
Nicholas Bellinger | b719125 | 2013-10-01 16:46:37 -0700 | [diff] [blame] | 561 | /* |
| 562 | * Reset cmd->data_length to individual block_size in order to not |
| 563 | * confuse backend drivers that depend on this value matching the |
| 564 | * size of the I/O being submitted. |
| 565 | */ |
| 566 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 567 | |
| 568 | ret = cmd->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
| 569 | DMA_FROM_DEVICE); |
| 570 | if (ret) { |
| 571 | cmd->transport_complete_callback = NULL; |
| 572 | up(&dev->caw_sem); |
| 573 | return ret; |
| 574 | } |
| 575 | /* |
| 576 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() |
| 577 | * upon MISCOMPARE, or in compare_and_write_done() upon completion |
| 578 | * of WRITE instance user-data. |
| 579 | */ |
| 580 | return TCM_NO_SENSE; |
| 581 | } |
| 582 | |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 583 | static int |
| 584 | sbc_set_prot_op_checks(u8 protect, enum target_prot_type prot_type, |
| 585 | bool is_write, struct se_cmd *cmd) |
| 586 | { |
| 587 | if (is_write) { |
| 588 | cmd->prot_op = protect ? TARGET_PROT_DOUT_PASS : |
| 589 | TARGET_PROT_DOUT_INSERT; |
| 590 | switch (protect) { |
| 591 | case 0x0: |
| 592 | case 0x3: |
| 593 | cmd->prot_checks = 0; |
| 594 | break; |
| 595 | case 0x1: |
| 596 | case 0x5: |
| 597 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 598 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 599 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; |
| 600 | break; |
| 601 | case 0x2: |
| 602 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 603 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; |
| 604 | break; |
| 605 | case 0x4: |
| 606 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 607 | break; |
| 608 | default: |
| 609 | pr_err("Unsupported protect field %d\n", protect); |
| 610 | return -EINVAL; |
| 611 | } |
| 612 | } else { |
| 613 | cmd->prot_op = protect ? TARGET_PROT_DIN_PASS : |
| 614 | TARGET_PROT_DIN_STRIP; |
| 615 | switch (protect) { |
| 616 | case 0x0: |
| 617 | case 0x1: |
| 618 | case 0x5: |
| 619 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 620 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 621 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; |
| 622 | break; |
| 623 | case 0x2: |
| 624 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 625 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; |
| 626 | break; |
| 627 | case 0x3: |
| 628 | cmd->prot_checks = 0; |
| 629 | break; |
| 630 | case 0x4: |
| 631 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 632 | break; |
| 633 | default: |
| 634 | pr_err("Unsupported protect field %d\n", protect); |
| 635 | return -EINVAL; |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | return 0; |
| 640 | } |
| 641 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 642 | static sense_reason_t |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 643 | sbc_check_prot(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb, |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 644 | u32 sectors, bool is_write) |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 645 | { |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 646 | u8 protect = cdb[1] >> 5; |
| 647 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 648 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
| 649 | if (protect && !dev->dev_attrib.pi_prot_type) { |
| 650 | pr_err("CDB contains protect bit, but device does not" |
| 651 | " advertise PROTECT=1 feature bit\n"); |
| 652 | return TCM_INVALID_CDB_FIELD; |
| 653 | } |
| 654 | if (cmd->prot_pto) |
| 655 | return TCM_NO_SENSE; |
| 656 | } |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 657 | |
| 658 | switch (dev->dev_attrib.pi_prot_type) { |
| 659 | case TARGET_DIF_TYPE3_PROT: |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 660 | cmd->reftag_seed = 0xffffffff; |
| 661 | break; |
| 662 | case TARGET_DIF_TYPE2_PROT: |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 663 | if (protect) |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 664 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 665 | |
| 666 | cmd->reftag_seed = cmd->t_task_lba; |
| 667 | break; |
| 668 | case TARGET_DIF_TYPE1_PROT: |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 669 | cmd->reftag_seed = cmd->t_task_lba; |
| 670 | break; |
| 671 | case TARGET_DIF_TYPE0_PROT: |
| 672 | default: |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 673 | return TCM_NO_SENSE; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 674 | } |
| 675 | |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 676 | if (sbc_set_prot_op_checks(protect, dev->dev_attrib.pi_prot_type, |
| 677 | is_write, cmd)) |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 678 | return TCM_INVALID_CDB_FIELD; |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 679 | |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 680 | cmd->prot_type = dev->dev_attrib.pi_prot_type; |
| 681 | cmd->prot_length = dev->prot_length * sectors; |
Sagi Grimberg | e2a4f55 | 2014-06-11 12:09:59 +0300 | [diff] [blame] | 682 | |
| 683 | /** |
| 684 | * In case protection information exists over the wire |
| 685 | * we modify command data length to describe pure data. |
| 686 | * The actual transfer length is data length + protection |
| 687 | * length |
| 688 | **/ |
| 689 | if (protect) |
| 690 | cmd->data_length = sectors * dev->dev_attrib.block_size; |
| 691 | |
| 692 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " |
| 693 | "prot_op=%d prot_checks=%d\n", |
| 694 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, |
Sagi Grimberg | 03abad9 | 2014-02-19 17:50:21 +0200 | [diff] [blame] | 695 | cmd->prot_op, cmd->prot_checks); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 696 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 697 | return TCM_NO_SENSE; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 698 | } |
| 699 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 700 | static int |
| 701 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) |
| 702 | { |
| 703 | if (cdb[1] & 0x10) { |
| 704 | if (!dev->dev_attrib.emulate_dpo) { |
| 705 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
| 706 | " does not advertise support for DPO\n", cdb[0]); |
| 707 | return -EINVAL; |
| 708 | } |
| 709 | } |
| 710 | if (cdb[1] & 0x8) { |
| 711 | if (!dev->dev_attrib.emulate_fua_write || |
| 712 | !dev->dev_attrib.emulate_write_cache) { |
| 713 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
| 714 | " does not advertise support for FUA write\n", |
| 715 | cdb[0]); |
| 716 | return -EINVAL; |
| 717 | } |
| 718 | cmd->se_cmd_flags |= SCF_FUA; |
| 719 | } |
| 720 | return 0; |
| 721 | } |
| 722 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 723 | sense_reason_t |
| 724 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 725 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 726 | struct se_device *dev = cmd->se_dev; |
| 727 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 728 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 729 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 730 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 731 | |
| 732 | switch (cdb[0]) { |
| 733 | case READ_6: |
| 734 | sectors = transport_get_sectors_6(cdb); |
| 735 | cmd->t_task_lba = transport_lba_21(cdb); |
| 736 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 737 | cmd->execute_rw = ops->execute_rw; |
| 738 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 739 | break; |
| 740 | case READ_10: |
| 741 | sectors = transport_get_sectors_10(cdb); |
| 742 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 743 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 744 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 745 | return TCM_INVALID_CDB_FIELD; |
| 746 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 747 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 748 | if (ret) |
| 749 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 750 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 751 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 752 | cmd->execute_rw = ops->execute_rw; |
| 753 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 754 | break; |
| 755 | case READ_12: |
| 756 | sectors = transport_get_sectors_12(cdb); |
| 757 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 758 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 759 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 760 | return TCM_INVALID_CDB_FIELD; |
| 761 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 762 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 763 | if (ret) |
| 764 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 765 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 766 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 767 | cmd->execute_rw = ops->execute_rw; |
| 768 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 769 | break; |
| 770 | case READ_16: |
| 771 | sectors = transport_get_sectors_16(cdb); |
| 772 | cmd->t_task_lba = transport_lba_64(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 773 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 774 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 775 | return TCM_INVALID_CDB_FIELD; |
| 776 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 777 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 778 | if (ret) |
| 779 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 780 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 781 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 782 | cmd->execute_rw = ops->execute_rw; |
| 783 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 784 | break; |
| 785 | case WRITE_6: |
| 786 | sectors = transport_get_sectors_6(cdb); |
| 787 | cmd->t_task_lba = transport_lba_21(cdb); |
| 788 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 789 | cmd->execute_rw = ops->execute_rw; |
| 790 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 791 | break; |
| 792 | case WRITE_10: |
| 793 | case WRITE_VERIFY: |
| 794 | sectors = transport_get_sectors_10(cdb); |
| 795 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 796 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 797 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 798 | return TCM_INVALID_CDB_FIELD; |
| 799 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 800 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 801 | if (ret) |
| 802 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 803 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 804 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 805 | cmd->execute_rw = ops->execute_rw; |
| 806 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 807 | break; |
| 808 | case WRITE_12: |
| 809 | sectors = transport_get_sectors_12(cdb); |
| 810 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 811 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 812 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 813 | return TCM_INVALID_CDB_FIELD; |
| 814 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 815 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 816 | if (ret) |
| 817 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 818 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 819 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 820 | cmd->execute_rw = ops->execute_rw; |
| 821 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 822 | break; |
| 823 | case WRITE_16: |
| 824 | sectors = transport_get_sectors_16(cdb); |
| 825 | cmd->t_task_lba = transport_lba_64(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 826 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 827 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 828 | return TCM_INVALID_CDB_FIELD; |
| 829 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 830 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 831 | if (ret) |
| 832 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 833 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 834 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 835 | cmd->execute_rw = ops->execute_rw; |
| 836 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 837 | break; |
| 838 | case XDWRITEREAD_10: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 839 | if (cmd->data_direction != DMA_TO_DEVICE || |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 840 | !(cmd->se_cmd_flags & SCF_BIDI)) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 841 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 842 | sectors = transport_get_sectors_10(cdb); |
| 843 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 844 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 845 | return TCM_INVALID_CDB_FIELD; |
| 846 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 847 | cmd->t_task_lba = transport_lba_32(cdb); |
| 848 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 849 | |
| 850 | /* |
| 851 | * Setup BIDI XOR callback to be run after I/O completion. |
| 852 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 853 | cmd->execute_rw = ops->execute_rw; |
| 854 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 855 | cmd->transport_complete_callback = &xdreadwrite_callback; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 856 | break; |
| 857 | case VARIABLE_LENGTH_CMD: |
| 858 | { |
| 859 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 860 | switch (service_action) { |
| 861 | case XDWRITEREAD_32: |
| 862 | sectors = transport_get_sectors_32(cdb); |
| 863 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 864 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 865 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 866 | /* |
| 867 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 868 | * XDWRITE_READ_32 logic. |
| 869 | */ |
| 870 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 871 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 872 | |
| 873 | /* |
| 874 | * Setup BIDI XOR callback to be run during after I/O |
| 875 | * completion. |
| 876 | */ |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 877 | cmd->execute_rw = ops->execute_rw; |
| 878 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 879 | cmd->transport_complete_callback = &xdreadwrite_callback; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 880 | break; |
| 881 | case WRITE_SAME_32: |
| 882 | sectors = transport_get_sectors_32(cdb); |
| 883 | if (!sectors) { |
| 884 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 885 | " supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 886 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 887 | } |
| 888 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 889 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 890 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 891 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 892 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 893 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 894 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 895 | break; |
| 896 | default: |
| 897 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 898 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 899 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 900 | } |
| 901 | break; |
| 902 | } |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 903 | case COMPARE_AND_WRITE: |
| 904 | sectors = cdb[13]; |
| 905 | /* |
| 906 | * Currently enforce COMPARE_AND_WRITE for a single sector |
| 907 | */ |
| 908 | if (sectors > 1) { |
| 909 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" |
| 910 | " than 1\n", sectors); |
| 911 | return TCM_INVALID_CDB_FIELD; |
| 912 | } |
| 913 | /* |
| 914 | * Double size because we have two buffers, note that |
| 915 | * zero is not an error.. |
| 916 | */ |
| 917 | size = 2 * sbc_get_size(cmd, sectors); |
| 918 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 919 | cmd->t_task_nolb = sectors; |
| 920 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; |
| 921 | cmd->execute_rw = ops->execute_rw; |
| 922 | cmd->execute_cmd = sbc_compare_and_write; |
| 923 | cmd->transport_complete_callback = compare_and_write_callback; |
| 924 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 925 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 926 | size = READ_CAP_LEN; |
| 927 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 928 | break; |
Hannes Reinecke | eb846d9 | 2014-11-17 14:25:19 +0100 | [diff] [blame] | 929 | case SERVICE_ACTION_IN_16: |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 930 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 931 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 932 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 933 | break; |
Hannes Reinecke | c66094b | 2013-12-17 09:18:49 +0100 | [diff] [blame] | 934 | case SAI_REPORT_REFERRALS: |
| 935 | cmd->execute_cmd = target_emulate_report_referrals; |
| 936 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 937 | default: |
| 938 | pr_err("Unsupported SA: 0x%02x\n", |
| 939 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 940 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 941 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 942 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 943 | (cdb[12] << 8) | cdb[13]; |
| 944 | break; |
| 945 | case SYNCHRONIZE_CACHE: |
| 946 | case SYNCHRONIZE_CACHE_16: |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 947 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 948 | sectors = transport_get_sectors_10(cdb); |
| 949 | cmd->t_task_lba = transport_lba_32(cdb); |
| 950 | } else { |
| 951 | sectors = transport_get_sectors_16(cdb); |
| 952 | cmd->t_task_lba = transport_lba_64(cdb); |
| 953 | } |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 954 | if (ops->execute_sync_cache) { |
| 955 | cmd->execute_cmd = ops->execute_sync_cache; |
| 956 | goto check_lba; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 957 | } |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 958 | size = 0; |
| 959 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 960 | break; |
| 961 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 962 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 963 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 964 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 965 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 966 | cmd->execute_cmd = ops->execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 967 | break; |
| 968 | case WRITE_SAME_16: |
| 969 | sectors = transport_get_sectors_16(cdb); |
| 970 | if (!sectors) { |
| 971 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 972 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 973 | } |
| 974 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 975 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 976 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 977 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 978 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 979 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 980 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 981 | break; |
| 982 | case WRITE_SAME: |
| 983 | sectors = transport_get_sectors_10(cdb); |
| 984 | if (!sectors) { |
| 985 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 986 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 987 | } |
| 988 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 989 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 990 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 991 | |
| 992 | /* |
| 993 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 994 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 995 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 996 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 997 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 998 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 999 | break; |
| 1000 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1001 | size = 0; |
Christophe Vu-Brugier | c52716d | 2014-06-10 17:53:22 +0200 | [diff] [blame] | 1002 | sectors = transport_get_sectors_10(cdb); |
| 1003 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 1004 | cmd->execute_cmd = sbc_emulate_noop; |
Christophe Vu-Brugier | c52716d | 2014-06-10 17:53:22 +0200 | [diff] [blame] | 1005 | goto check_lba; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 1006 | case REZERO_UNIT: |
| 1007 | case SEEK_6: |
| 1008 | case SEEK_10: |
| 1009 | /* |
| 1010 | * There are still clients out there which use these old SCSI-2 |
| 1011 | * commands. This mainly happens when running VMs with legacy |
| 1012 | * guest systems, connected via SCSI command pass-through to |
| 1013 | * iSCSI targets. Make them happy and return status GOOD. |
| 1014 | */ |
| 1015 | size = 0; |
| 1016 | cmd->execute_cmd = sbc_emulate_noop; |
| 1017 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1018 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1019 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1020 | if (ret) |
| 1021 | return ret; |
| 1022 | } |
| 1023 | |
| 1024 | /* reject any command that we don't have a handler for */ |
Andy Grover | 20959c4 | 2014-10-01 16:07:02 -0700 | [diff] [blame] | 1025 | if (!cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1026 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1027 | |
| 1028 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1029 | unsigned long long end_lba; |
| 1030 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1031 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1032 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 1033 | " big sectors %u exceeds fabric_max_sectors:" |
| 1034 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1035 | dev->dev_attrib.fabric_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1036 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1037 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1038 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1039 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 1040 | " big sectors %u exceeds backend hw_max_sectors:" |
| 1041 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 1042 | dev->dev_attrib.hw_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1043 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1044 | } |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 1045 | check_lba: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1046 | end_lba = dev->transport->get_blocks(dev) + 1; |
Nicholas Bellinger | aa17993 | 2015-02-13 22:27:40 +0000 | [diff] [blame] | 1047 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
| 1048 | ((cmd->t_task_lba + sectors) > end_lba)) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1049 | pr_err("cmd exceeds last lba %llu " |
| 1050 | "(lba %llu, sectors %u)\n", |
| 1051 | end_lba, cmd->t_task_lba, sectors); |
Roland Dreier | 09ceadc | 2013-06-26 17:36:18 -0700 | [diff] [blame] | 1052 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1053 | } |
| 1054 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 1055 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
| 1056 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1057 | } |
| 1058 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1059 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1060 | } |
| 1061 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 1062 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 1063 | u32 sbc_get_device_type(struct se_device *dev) |
| 1064 | { |
| 1065 | return TYPE_DISK; |
| 1066 | } |
| 1067 | EXPORT_SYMBOL(sbc_get_device_type); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 1068 | |
| 1069 | sense_reason_t |
| 1070 | sbc_execute_unmap(struct se_cmd *cmd, |
| 1071 | sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *, |
| 1072 | sector_t, sector_t), |
| 1073 | void *priv) |
| 1074 | { |
| 1075 | struct se_device *dev = cmd->se_dev; |
| 1076 | unsigned char *buf, *ptr = NULL; |
| 1077 | sector_t lba; |
| 1078 | int size; |
| 1079 | u32 range; |
| 1080 | sense_reason_t ret = 0; |
| 1081 | int dl, bd_dl; |
| 1082 | |
| 1083 | /* We never set ANC_SUP */ |
| 1084 | if (cmd->t_task_cdb[1]) |
| 1085 | return TCM_INVALID_CDB_FIELD; |
| 1086 | |
| 1087 | if (cmd->data_length == 0) { |
| 1088 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 1089 | return 0; |
| 1090 | } |
| 1091 | |
| 1092 | if (cmd->data_length < 8) { |
| 1093 | pr_warn("UNMAP parameter list length %u too small\n", |
| 1094 | cmd->data_length); |
| 1095 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| 1096 | } |
| 1097 | |
| 1098 | buf = transport_kmap_data_sg(cmd); |
| 1099 | if (!buf) |
| 1100 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 1101 | |
| 1102 | dl = get_unaligned_be16(&buf[0]); |
| 1103 | bd_dl = get_unaligned_be16(&buf[2]); |
| 1104 | |
| 1105 | size = cmd->data_length - 8; |
| 1106 | if (bd_dl > size) |
| 1107 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", |
| 1108 | cmd->data_length, bd_dl); |
| 1109 | else |
| 1110 | size = bd_dl; |
| 1111 | |
| 1112 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
| 1113 | ret = TCM_INVALID_PARAMETER_LIST; |
| 1114 | goto err; |
| 1115 | } |
| 1116 | |
| 1117 | /* First UNMAP block descriptor starts at 8 byte offset */ |
| 1118 | ptr = &buf[8]; |
| 1119 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" |
| 1120 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
| 1121 | |
| 1122 | while (size >= 16) { |
| 1123 | lba = get_unaligned_be64(&ptr[0]); |
| 1124 | range = get_unaligned_be32(&ptr[8]); |
| 1125 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", |
| 1126 | (unsigned long long)lba, range); |
| 1127 | |
| 1128 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
| 1129 | ret = TCM_INVALID_PARAMETER_LIST; |
| 1130 | goto err; |
| 1131 | } |
| 1132 | |
| 1133 | if (lba + range > dev->transport->get_blocks(dev) + 1) { |
| 1134 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
| 1135 | goto err; |
| 1136 | } |
| 1137 | |
| 1138 | ret = do_unmap_fn(cmd, priv, lba, range); |
| 1139 | if (ret) |
| 1140 | goto err; |
| 1141 | |
| 1142 | ptr += 16; |
| 1143 | size -= 16; |
| 1144 | } |
| 1145 | |
| 1146 | err: |
| 1147 | transport_kunmap_data_sg(cmd); |
| 1148 | if (!ret) |
| 1149 | target_complete_cmd(cmd, GOOD); |
| 1150 | return ret; |
| 1151 | } |
| 1152 | EXPORT_SYMBOL(sbc_execute_unmap); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1153 | |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1154 | void |
| 1155 | sbc_dif_generate(struct se_cmd *cmd) |
| 1156 | { |
| 1157 | struct se_device *dev = cmd->se_dev; |
| 1158 | struct se_dif_v1_tuple *sdt; |
| 1159 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; |
| 1160 | sector_t sector = cmd->t_task_lba; |
| 1161 | void *daddr, *paddr; |
| 1162 | int i, j, offset = 0; |
| 1163 | |
| 1164 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { |
| 1165 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
| 1166 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
| 1167 | |
| 1168 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { |
| 1169 | |
| 1170 | if (offset >= psg->length) { |
| 1171 | kunmap_atomic(paddr); |
| 1172 | psg = sg_next(psg); |
| 1173 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
| 1174 | offset = 0; |
| 1175 | } |
| 1176 | |
| 1177 | sdt = paddr + offset; |
| 1178 | sdt->guard_tag = cpu_to_be16(crc_t10dif(daddr + j, |
| 1179 | dev->dev_attrib.block_size)); |
| 1180 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT) |
| 1181 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
| 1182 | sdt->app_tag = 0; |
| 1183 | |
| 1184 | pr_debug("DIF WRITE INSERT sector: %llu guard_tag: 0x%04x" |
| 1185 | " app_tag: 0x%04x ref_tag: %u\n", |
| 1186 | (unsigned long long)sector, sdt->guard_tag, |
| 1187 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); |
| 1188 | |
| 1189 | sector++; |
| 1190 | offset += sizeof(struct se_dif_v1_tuple); |
| 1191 | } |
| 1192 | |
| 1193 | kunmap_atomic(paddr); |
| 1194 | kunmap_atomic(daddr); |
| 1195 | } |
| 1196 | } |
| 1197 | |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1198 | static sense_reason_t |
| 1199 | sbc_dif_v1_verify(struct se_device *dev, struct se_dif_v1_tuple *sdt, |
| 1200 | const void *p, sector_t sector, unsigned int ei_lba) |
| 1201 | { |
| 1202 | int block_size = dev->dev_attrib.block_size; |
| 1203 | __be16 csum; |
| 1204 | |
| 1205 | csum = cpu_to_be16(crc_t10dif(p, block_size)); |
| 1206 | |
| 1207 | if (sdt->guard_tag != csum) { |
| 1208 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" |
| 1209 | " csum 0x%04x\n", (unsigned long long)sector, |
| 1210 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); |
| 1211 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; |
| 1212 | } |
| 1213 | |
| 1214 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT && |
| 1215 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
| 1216 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" |
| 1217 | " sector MSB: 0x%08x\n", (unsigned long long)sector, |
| 1218 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); |
| 1219 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; |
| 1220 | } |
| 1221 | |
| 1222 | if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE2_PROT && |
| 1223 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
| 1224 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" |
| 1225 | " ei_lba: 0x%08x\n", (unsigned long long)sector, |
| 1226 | be32_to_cpu(sdt->ref_tag), ei_lba); |
| 1227 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; |
| 1228 | } |
| 1229 | |
| 1230 | return 0; |
| 1231 | } |
| 1232 | |
| 1233 | static void |
| 1234 | sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
| 1235 | struct scatterlist *sg, int sg_off) |
| 1236 | { |
| 1237 | struct se_device *dev = cmd->se_dev; |
| 1238 | struct scatterlist *psg; |
| 1239 | void *paddr, *addr; |
| 1240 | unsigned int i, len, left; |
Nicholas Bellinger | 10762e8 | 2014-02-23 12:52:44 +0000 | [diff] [blame] | 1241 | unsigned int offset = sg_off; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1242 | |
| 1243 | left = sectors * dev->prot_length; |
| 1244 | |
| 1245 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1246 | unsigned int psg_len, copied = 0; |
Sagi Grimberg | d6a65fd | 2014-02-12 11:40:25 +0200 | [diff] [blame] | 1247 | |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1248 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1249 | psg_len = min(left, psg->length); |
| 1250 | while (psg_len) { |
| 1251 | len = min(psg_len, sg->length - offset); |
| 1252 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1253 | |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1254 | if (read) |
| 1255 | memcpy(paddr + copied, addr, len); |
| 1256 | else |
| 1257 | memcpy(addr, paddr + copied, len); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1258 | |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1259 | left -= len; |
| 1260 | offset += len; |
| 1261 | copied += len; |
| 1262 | psg_len -= len; |
| 1263 | |
| 1264 | if (offset >= sg->length) { |
| 1265 | sg = sg_next(sg); |
| 1266 | offset = 0; |
| 1267 | } |
| 1268 | kunmap_atomic(addr); |
| 1269 | } |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1270 | kunmap_atomic(paddr); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1271 | } |
| 1272 | } |
| 1273 | |
| 1274 | sense_reason_t |
| 1275 | sbc_dif_verify_write(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
| 1276 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) |
| 1277 | { |
| 1278 | struct se_device *dev = cmd->se_dev; |
| 1279 | struct se_dif_v1_tuple *sdt; |
| 1280 | struct scatterlist *dsg, *psg = cmd->t_prot_sg; |
| 1281 | sector_t sector = start; |
| 1282 | void *daddr, *paddr; |
| 1283 | int i, j, offset = 0; |
| 1284 | sense_reason_t rc; |
| 1285 | |
| 1286 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { |
| 1287 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
| 1288 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
| 1289 | |
| 1290 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { |
| 1291 | |
| 1292 | if (offset >= psg->length) { |
| 1293 | kunmap_atomic(paddr); |
| 1294 | psg = sg_next(psg); |
| 1295 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
| 1296 | offset = 0; |
| 1297 | } |
| 1298 | |
| 1299 | sdt = paddr + offset; |
| 1300 | |
| 1301 | pr_debug("DIF WRITE sector: %llu guard_tag: 0x%04x" |
| 1302 | " app_tag: 0x%04x ref_tag: %u\n", |
| 1303 | (unsigned long long)sector, sdt->guard_tag, |
| 1304 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); |
| 1305 | |
| 1306 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, |
| 1307 | ei_lba); |
| 1308 | if (rc) { |
| 1309 | kunmap_atomic(paddr); |
| 1310 | kunmap_atomic(daddr); |
Sagi Grimberg | 76736db | 2014-01-23 19:29:38 +0200 | [diff] [blame] | 1311 | cmd->bad_sector = sector; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1312 | return rc; |
| 1313 | } |
| 1314 | |
| 1315 | sector++; |
| 1316 | ei_lba++; |
| 1317 | offset += sizeof(struct se_dif_v1_tuple); |
| 1318 | } |
| 1319 | |
| 1320 | kunmap_atomic(paddr); |
| 1321 | kunmap_atomic(daddr); |
| 1322 | } |
| 1323 | sbc_dif_copy_prot(cmd, sectors, false, sg, sg_off); |
| 1324 | |
| 1325 | return 0; |
| 1326 | } |
| 1327 | EXPORT_SYMBOL(sbc_dif_verify_write); |
| 1328 | |
Nicholas Bellinger | 395ccb2 | 2014-04-02 14:34:11 -0700 | [diff] [blame] | 1329 | static sense_reason_t |
| 1330 | __sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
| 1331 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1332 | { |
| 1333 | struct se_device *dev = cmd->se_dev; |
| 1334 | struct se_dif_v1_tuple *sdt; |
Sagi Grimberg | fc272ec | 2014-02-23 14:20:08 +0200 | [diff] [blame] | 1335 | struct scatterlist *dsg, *psg = sg; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1336 | sector_t sector = start; |
| 1337 | void *daddr, *paddr; |
| 1338 | int i, j, offset = sg_off; |
| 1339 | sense_reason_t rc; |
| 1340 | |
| 1341 | for_each_sg(cmd->t_data_sg, dsg, cmd->t_data_nents, i) { |
| 1342 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
Sagi Grimberg | fc272ec | 2014-02-23 14:20:08 +0200 | [diff] [blame] | 1343 | paddr = kmap_atomic(sg_page(psg)) + sg->offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1344 | |
| 1345 | for (j = 0; j < dsg->length; j += dev->dev_attrib.block_size) { |
| 1346 | |
Sagi Grimberg | fc272ec | 2014-02-23 14:20:08 +0200 | [diff] [blame] | 1347 | if (offset >= psg->length) { |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1348 | kunmap_atomic(paddr); |
Sagi Grimberg | fc272ec | 2014-02-23 14:20:08 +0200 | [diff] [blame] | 1349 | psg = sg_next(psg); |
| 1350 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1351 | offset = 0; |
| 1352 | } |
| 1353 | |
| 1354 | sdt = paddr + offset; |
| 1355 | |
| 1356 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" |
| 1357 | " app_tag: 0x%04x ref_tag: %u\n", |
| 1358 | (unsigned long long)sector, sdt->guard_tag, |
| 1359 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); |
| 1360 | |
| 1361 | if (sdt->app_tag == cpu_to_be16(0xffff)) { |
| 1362 | sector++; |
| 1363 | offset += sizeof(struct se_dif_v1_tuple); |
| 1364 | continue; |
| 1365 | } |
| 1366 | |
| 1367 | rc = sbc_dif_v1_verify(dev, sdt, daddr + j, sector, |
| 1368 | ei_lba); |
| 1369 | if (rc) { |
| 1370 | kunmap_atomic(paddr); |
| 1371 | kunmap_atomic(daddr); |
Sagi Grimberg | 76736db | 2014-01-23 19:29:38 +0200 | [diff] [blame] | 1372 | cmd->bad_sector = sector; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1373 | return rc; |
| 1374 | } |
| 1375 | |
| 1376 | sector++; |
| 1377 | ei_lba++; |
| 1378 | offset += sizeof(struct se_dif_v1_tuple); |
| 1379 | } |
| 1380 | |
| 1381 | kunmap_atomic(paddr); |
| 1382 | kunmap_atomic(daddr); |
| 1383 | } |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1384 | |
| 1385 | return 0; |
| 1386 | } |
Nicholas Bellinger | 395ccb2 | 2014-04-02 14:34:11 -0700 | [diff] [blame] | 1387 | |
| 1388 | sense_reason_t |
| 1389 | sbc_dif_read_strip(struct se_cmd *cmd) |
| 1390 | { |
| 1391 | struct se_device *dev = cmd->se_dev; |
| 1392 | u32 sectors = cmd->prot_length / dev->prot_length; |
| 1393 | |
| 1394 | return __sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 0, |
| 1395 | cmd->t_prot_sg, 0); |
| 1396 | } |
| 1397 | |
| 1398 | sense_reason_t |
| 1399 | sbc_dif_verify_read(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
| 1400 | unsigned int ei_lba, struct scatterlist *sg, int sg_off) |
| 1401 | { |
| 1402 | sense_reason_t rc; |
| 1403 | |
| 1404 | rc = __sbc_dif_verify_read(cmd, start, sectors, ei_lba, sg, sg_off); |
| 1405 | if (rc) |
| 1406 | return rc; |
| 1407 | |
| 1408 | sbc_dif_copy_prot(cmd, sectors, true, sg, sg_off); |
| 1409 | return 0; |
| 1410 | } |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1411 | EXPORT_SYMBOL(sbc_dif_verify_read); |