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> |
Bart Van Assche | ba92999 | 2015-05-08 10:11:12 +0200 | [diff] [blame] | 28 | #include <scsi/scsi_proto.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); |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 41 | static sense_reason_t sbc_execute_unmap(struct se_cmd *cmd); |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 42 | |
| 43 | static sense_reason_t |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 44 | sbc_emulate_readcapacity(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 45 | { |
| 46 | struct se_device *dev = cmd->se_dev; |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 47 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 48 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 49 | unsigned char *rbuf; |
| 50 | unsigned char buf[8]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 51 | u32 blocks; |
| 52 | |
Roland Dreier | 8dc8632 | 2013-06-26 17:36:19 -0700 | [diff] [blame] | 53 | /* |
| 54 | * SBC-2 says: |
| 55 | * If the PMI bit is set to zero and the LOGICAL BLOCK |
| 56 | * ADDRESS field is not set to zero, the device server shall |
| 57 | * terminate the command with CHECK CONDITION status with |
| 58 | * the sense key set to ILLEGAL REQUEST and the additional |
| 59 | * sense code set to INVALID FIELD IN CDB. |
| 60 | * |
| 61 | * In SBC-3, these fields are obsolete, but some SCSI |
| 62 | * compliance tests actually check this, so we might as well |
| 63 | * follow SBC-2. |
| 64 | */ |
| 65 | if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5])) |
| 66 | return TCM_INVALID_CDB_FIELD; |
| 67 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 68 | if (blocks_long >= 0x00000000ffffffff) |
| 69 | blocks = 0xffffffff; |
| 70 | else |
| 71 | blocks = (u32)blocks_long; |
| 72 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 73 | buf[0] = (blocks >> 24) & 0xff; |
| 74 | buf[1] = (blocks >> 16) & 0xff; |
| 75 | buf[2] = (blocks >> 8) & 0xff; |
| 76 | buf[3] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 77 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 78 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 79 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 80 | buf[7] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 81 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 82 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 83 | if (rbuf) { |
| 84 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 85 | transport_kunmap_data_sg(cmd); |
| 86 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 87 | |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 88 | target_complete_cmd_with_length(cmd, GOOD, 8); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 89 | return 0; |
| 90 | } |
| 91 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 92 | static sense_reason_t |
| 93 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 94 | { |
| 95 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | 2d33598 | 2014-04-02 13:34:04 -0700 | [diff] [blame] | 96 | struct se_session *sess = cmd->se_sess; |
Nicholas Bellinger | 9ef5466 | 2015-02-27 22:05:33 -0800 | [diff] [blame] | 97 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
| 98 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 99 | unsigned char *rbuf; |
| 100 | unsigned char buf[32]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 101 | unsigned long long blocks = dev->transport->get_blocks(dev); |
| 102 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 103 | memset(buf, 0, sizeof(buf)); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 104 | buf[0] = (blocks >> 56) & 0xff; |
| 105 | buf[1] = (blocks >> 48) & 0xff; |
| 106 | buf[2] = (blocks >> 40) & 0xff; |
| 107 | buf[3] = (blocks >> 32) & 0xff; |
| 108 | buf[4] = (blocks >> 24) & 0xff; |
| 109 | buf[5] = (blocks >> 16) & 0xff; |
| 110 | buf[6] = (blocks >> 8) & 0xff; |
| 111 | buf[7] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 112 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 113 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 114 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 115 | buf[11] = dev->dev_attrib.block_size & 0xff; |
Nicholas Bellinger | 56dac14 | 2013-12-23 20:36:09 +0000 | [diff] [blame] | 116 | /* |
| 117 | * Set P_TYPE and PROT_EN bits for DIF support |
| 118 | */ |
Nicholas Bellinger | 2d33598 | 2014-04-02 13:34:04 -0700 | [diff] [blame] | 119 | if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) { |
Nicholas Bellinger | 9ef5466 | 2015-02-27 22:05:33 -0800 | [diff] [blame] | 120 | /* |
| 121 | * Only override a device's pi_prot_type if no T10-PI is |
| 122 | * available, and sess_prot_type has been explicitly enabled. |
| 123 | */ |
| 124 | if (!pi_prot_type) |
| 125 | pi_prot_type = sess->sess_prot_type; |
| 126 | |
| 127 | if (pi_prot_type) |
| 128 | buf[12] = (pi_prot_type - 1) << 1 | 0x1; |
Nicholas Bellinger | 2d33598 | 2014-04-02 13:34:04 -0700 | [diff] [blame] | 129 | } |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 130 | |
| 131 | if (dev->transport->get_lbppbe) |
| 132 | buf[13] = dev->transport->get_lbppbe(dev) & 0x0f; |
| 133 | |
| 134 | if (dev->transport->get_alignment_offset_lbas) { |
| 135 | u16 lalba = dev->transport->get_alignment_offset_lbas(dev); |
| 136 | buf[14] = (lalba >> 8) & 0x3f; |
| 137 | buf[15] = lalba & 0xff; |
| 138 | } |
| 139 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 140 | /* |
| 141 | * Set Thin Provisioning Enable bit following sbc3r22 in section |
| 142 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| 143 | */ |
Jamie Pocas | e6f4163 | 2015-11-29 14:44:57 -0800 | [diff] [blame] | 144 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) { |
Andy Grover | 7f7caf6 | 2013-11-11 08:59:17 -0800 | [diff] [blame] | 145 | buf[14] |= 0x80; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 146 | |
Jamie Pocas | e6f4163 | 2015-11-29 14:44:57 -0800 | [diff] [blame] | 147 | /* |
| 148 | * LBPRZ signifies that zeroes will be read back from an LBA after |
| 149 | * an UNMAP or WRITE SAME w/ unmap bit (sbc3r36 5.16.2) |
| 150 | */ |
| 151 | if (dev->dev_attrib.unmap_zeroes_data) |
| 152 | buf[14] |= 0x40; |
| 153 | } |
| 154 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 155 | rbuf = transport_kmap_data_sg(cmd); |
Nicholas Bellinger | 8b4b0dc | 2013-01-29 14:18:00 -0800 | [diff] [blame] | 156 | if (rbuf) { |
| 157 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 158 | transport_kunmap_data_sg(cmd); |
| 159 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 160 | |
Roland Dreier | 2426bd4 | 2014-06-10 11:07:47 -0700 | [diff] [blame] | 161 | target_complete_cmd_with_length(cmd, GOOD, 32); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 162 | return 0; |
| 163 | } |
| 164 | |
Brian Bunker | 45182ed | 2015-07-23 15:27:46 -0700 | [diff] [blame] | 165 | static sense_reason_t |
| 166 | sbc_emulate_startstop(struct se_cmd *cmd) |
| 167 | { |
| 168 | unsigned char *cdb = cmd->t_task_cdb; |
| 169 | |
| 170 | /* |
| 171 | * See sbc3r36 section 5.25 |
| 172 | * Immediate bit should be set since there is nothing to complete |
| 173 | * POWER CONDITION MODIFIER 0h |
| 174 | */ |
| 175 | if (!(cdb[1] & 1) || cdb[2] || cdb[3]) |
| 176 | return TCM_INVALID_CDB_FIELD; |
| 177 | |
| 178 | /* |
| 179 | * See sbc3r36 section 5.25 |
| 180 | * POWER CONDITION 0h START_VALID - process START and LOEJ |
| 181 | */ |
| 182 | if (cdb[4] >> 4 & 0xf) |
| 183 | return TCM_INVALID_CDB_FIELD; |
| 184 | |
| 185 | /* |
| 186 | * See sbc3r36 section 5.25 |
| 187 | * LOEJ 0h - nothing to load or unload |
| 188 | * START 1h - we are ready |
| 189 | */ |
| 190 | if (!(cdb[4] & 1) || (cdb[4] & 2) || (cdb[4] & 4)) |
| 191 | return TCM_INVALID_CDB_FIELD; |
| 192 | |
| 193 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 194 | return 0; |
| 195 | } |
| 196 | |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 197 | sector_t sbc_get_write_same_sectors(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 198 | { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 199 | u32 num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 200 | |
| 201 | if (cmd->t_task_cdb[0] == WRITE_SAME) |
| 202 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| 203 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| 204 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| 205 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| 206 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| 207 | |
| 208 | /* |
| 209 | * Use the explicit range when non zero is supplied, otherwise calculate |
| 210 | * the remaining range based on ->get_blocks() - starting LBA. |
| 211 | */ |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 212 | if (num_blocks) |
| 213 | return num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 214 | |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 215 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| 216 | cmd->t_task_lba + 1; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 217 | } |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 218 | EXPORT_SYMBOL(sbc_get_write_same_sectors); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 219 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 220 | static sense_reason_t |
Christoph Hellwig | b753d64 | 2015-06-19 15:11:00 +0200 | [diff] [blame] | 221 | sbc_execute_write_same_unmap(struct se_cmd *cmd) |
| 222 | { |
| 223 | struct sbc_ops *ops = cmd->protocol_data; |
| 224 | sector_t nolb = sbc_get_write_same_sectors(cmd); |
| 225 | sense_reason_t ret; |
| 226 | |
| 227 | if (nolb) { |
| 228 | ret = ops->execute_unmap(cmd, cmd->t_task_lba, nolb); |
| 229 | if (ret) |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | target_complete_cmd(cmd, GOOD); |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | static sense_reason_t |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 238 | sbc_emulate_noop(struct se_cmd *cmd) |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 239 | { |
| 240 | target_complete_cmd(cmd, GOOD); |
| 241 | return 0; |
| 242 | } |
| 243 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 244 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 245 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 246 | return cmd->se_dev->dev_attrib.block_size * sectors; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 247 | } |
| 248 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 249 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 250 | { |
| 251 | /* |
| 252 | * Use 8-bit sector value. SBC-3 says: |
| 253 | * |
| 254 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 255 | * logical blocks shall be written. Any other value |
| 256 | * specifies the number of logical blocks that shall be |
| 257 | * written. |
| 258 | */ |
| 259 | return cdb[4] ? : 256; |
| 260 | } |
| 261 | |
| 262 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 263 | { |
| 264 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 265 | } |
| 266 | |
| 267 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 268 | { |
| 269 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 270 | } |
| 271 | |
| 272 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 273 | { |
| 274 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 275 | (cdb[12] << 8) + cdb[13]; |
| 276 | } |
| 277 | |
| 278 | /* |
| 279 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 280 | */ |
| 281 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 282 | { |
| 283 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 284 | (cdb[30] << 8) + cdb[31]; |
| 285 | |
| 286 | } |
| 287 | |
| 288 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 289 | { |
| 290 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 291 | } |
| 292 | |
| 293 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 294 | { |
| 295 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 296 | } |
| 297 | |
| 298 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 299 | { |
| 300 | unsigned int __v1, __v2; |
| 301 | |
| 302 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 303 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 304 | |
| 305 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 310 | */ |
| 311 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 312 | { |
| 313 | unsigned int __v1, __v2; |
| 314 | |
| 315 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 316 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 317 | |
| 318 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 319 | } |
| 320 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 321 | static sense_reason_t |
| 322 | 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] | 323 | { |
Nicholas Bellinger | 8e575c5 | 2015-02-13 22:09:47 +0000 | [diff] [blame] | 324 | struct se_device *dev = cmd->se_dev; |
| 325 | sector_t end_lba = dev->transport->get_blocks(dev) + 1; |
Roland Dreier | 972b29c8 | 2013-02-22 09:52:57 -0800 | [diff] [blame] | 326 | unsigned int sectors = sbc_get_write_same_sectors(cmd); |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 327 | sense_reason_t ret; |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 328 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 329 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 330 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 331 | " bits not supported for Block Discard" |
| 332 | " Emulation\n"); |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 333 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 334 | } |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 335 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| 336 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| 337 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| 338 | return TCM_INVALID_CDB_FIELD; |
| 339 | } |
Nicholas Bellinger | 8e575c5 | 2015-02-13 22:09:47 +0000 | [diff] [blame] | 340 | /* |
| 341 | * Sanity check for LBA wrap and request past end of device. |
| 342 | */ |
| 343 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
| 344 | ((cmd->t_task_lba + sectors) > end_lba)) { |
| 345 | pr_err("WRITE_SAME exceeds last lba %llu (lba %llu, sectors %u)\n", |
| 346 | (unsigned long long)end_lba, cmd->t_task_lba, sectors); |
| 347 | return TCM_ADDRESS_OUT_OF_RANGE; |
| 348 | } |
| 349 | |
Roland Dreier | 5cb770b | 2013-10-14 15:49:23 -0700 | [diff] [blame] | 350 | /* We always have ANC_SUP == 0 so setting ANCHOR is always an error */ |
| 351 | if (flags[0] & 0x10) { |
| 352 | pr_warn("WRITE SAME with ANCHOR not supported\n"); |
| 353 | return TCM_INVALID_CDB_FIELD; |
| 354 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 355 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 356 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 357 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 358 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 359 | if (flags[0] & 0x08) { |
Christoph Hellwig | b753d64 | 2015-06-19 15:11:00 +0200 | [diff] [blame] | 360 | if (!ops->execute_unmap) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 361 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 362 | |
Nicholas Bellinger | d0a9129 | 2015-02-14 01:56:19 +0000 | [diff] [blame] | 363 | if (!dev->dev_attrib.emulate_tpws) { |
| 364 | pr_err("Got WRITE_SAME w/ UNMAP=1, but backend device" |
| 365 | " has emulate_tpws disabled\n"); |
| 366 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 367 | } |
Christoph Hellwig | b753d64 | 2015-06-19 15:11:00 +0200 | [diff] [blame] | 368 | cmd->execute_cmd = sbc_execute_write_same_unmap; |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 369 | return 0; |
| 370 | } |
| 371 | if (!ops->execute_write_same) |
| 372 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 373 | |
Nicholas Bellinger | afd73f1 | 2015-02-14 01:32:11 +0000 | [diff] [blame] | 374 | ret = sbc_check_prot(dev, cmd, &cmd->t_task_cdb[0], sectors, true); |
| 375 | if (ret) |
| 376 | return ret; |
| 377 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 378 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 379 | return 0; |
| 380 | } |
| 381 | |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 382 | static sense_reason_t xdreadwrite_callback(struct se_cmd *cmd, bool success, |
| 383 | int *post_ret) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 384 | { |
| 385 | unsigned char *buf, *addr; |
| 386 | struct scatterlist *sg; |
| 387 | unsigned int offset; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 388 | sense_reason_t ret = TCM_NO_SENSE; |
| 389 | int i, count; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 390 | /* |
| 391 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 392 | * |
| 393 | * 1) read the specified logical block(s); |
| 394 | * 2) transfer logical blocks from the data-out buffer; |
| 395 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 396 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 397 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 398 | * blocks transferred from the data-out buffer; and |
| 399 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 400 | */ |
| 401 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 402 | if (!buf) { |
| 403 | pr_err("Unable to allocate xor_callback buf\n"); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 404 | return TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 405 | } |
| 406 | /* |
| 407 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 408 | * into the locally allocated *buf |
| 409 | */ |
| 410 | sg_copy_to_buffer(cmd->t_data_sg, |
| 411 | cmd->t_data_nents, |
| 412 | buf, |
| 413 | cmd->data_length); |
| 414 | |
| 415 | /* |
| 416 | * Now perform the XOR against the BIDI read memory located at |
| 417 | * cmd->t_mem_bidi_list |
| 418 | */ |
| 419 | |
| 420 | offset = 0; |
| 421 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 422 | addr = kmap_atomic(sg_page(sg)); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 423 | if (!addr) { |
| 424 | ret = TCM_OUT_OF_RESOURCES; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 425 | goto out; |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 426 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 427 | |
| 428 | for (i = 0; i < sg->length; i++) |
| 429 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 430 | |
| 431 | offset += sg->length; |
| 432 | kunmap_atomic(addr); |
| 433 | } |
| 434 | |
| 435 | out: |
| 436 | kfree(buf); |
Nicholas Bellinger | a6b0133 | 2013-08-19 14:34:17 -0700 | [diff] [blame] | 437 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 438 | } |
| 439 | |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 440 | static sense_reason_t |
| 441 | sbc_execute_rw(struct se_cmd *cmd) |
| 442 | { |
Christoph Hellwig | 7a971b1 | 2015-06-19 15:10:58 +0200 | [diff] [blame] | 443 | struct sbc_ops *ops = cmd->protocol_data; |
| 444 | |
| 445 | return ops->execute_rw(cmd, cmd->t_data_sg, cmd->t_data_nents, |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 446 | cmd->data_direction); |
| 447 | } |
| 448 | |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 449 | static sense_reason_t compare_and_write_post(struct se_cmd *cmd, bool success, |
| 450 | int *post_ret) |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 451 | { |
| 452 | struct se_device *dev = cmd->se_dev; |
Nicholas Bellinger | 84d209b | 2017-02-06 14:28:09 -0800 | [diff] [blame] | 453 | sense_reason_t ret = TCM_NO_SENSE; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 454 | |
Nicholas Bellinger | d8855c1 | 2013-10-01 16:53:10 -0700 | [diff] [blame] | 455 | /* |
| 456 | * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through |
| 457 | * within target_complete_ok_work() if the command was successfully |
| 458 | * sent to the backend driver. |
| 459 | */ |
| 460 | spin_lock_irq(&cmd->t_state_lock); |
Nicholas Bellinger | 84d209b | 2017-02-06 14:28:09 -0800 | [diff] [blame] | 461 | if (cmd->transport_state & CMD_T_SENT) { |
Nicholas Bellinger | d8855c1 | 2013-10-01 16:53:10 -0700 | [diff] [blame] | 462 | cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST; |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 463 | *post_ret = 1; |
Nicholas Bellinger | 84d209b | 2017-02-06 14:28:09 -0800 | [diff] [blame] | 464 | |
| 465 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) |
| 466 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 467 | } |
Nicholas Bellinger | d8855c1 | 2013-10-01 16:53:10 -0700 | [diff] [blame] | 468 | spin_unlock_irq(&cmd->t_state_lock); |
| 469 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 470 | /* |
| 471 | * Unlock ->caw_sem originally obtained during sbc_compare_and_write() |
| 472 | * before the original READ I/O submission. |
| 473 | */ |
| 474 | up(&dev->caw_sem); |
| 475 | |
Nicholas Bellinger | 84d209b | 2017-02-06 14:28:09 -0800 | [diff] [blame] | 476 | return ret; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 477 | } |
| 478 | |
Nicholas Bellinger | 057085e | 2015-11-05 23:37:59 -0800 | [diff] [blame] | 479 | static sense_reason_t compare_and_write_callback(struct se_cmd *cmd, bool success, |
| 480 | int *post_ret) |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 481 | { |
| 482 | struct se_device *dev = cmd->se_dev; |
| 483 | struct scatterlist *write_sg = NULL, *sg; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 484 | unsigned char *buf = NULL, *addr; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 485 | struct sg_mapping_iter m; |
| 486 | unsigned int offset = 0, len; |
| 487 | unsigned int nlbas = cmd->t_task_nolb; |
| 488 | unsigned int block_size = dev->dev_attrib.block_size; |
| 489 | unsigned int compare_len = (nlbas * block_size); |
| 490 | sense_reason_t ret = TCM_NO_SENSE; |
| 491 | int rc, i; |
| 492 | |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 493 | /* |
| 494 | * Handle early failure in transport_generic_request_failure(), |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 495 | * which will not have taken ->caw_sem yet.. |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 496 | */ |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 497 | if (!success && (!cmd->t_data_sg || !cmd->t_bidi_data_sg)) |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 498 | return TCM_NO_SENSE; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 499 | /* |
Nicholas Bellinger | c8e6398 | 2015-04-07 21:53:27 +0000 | [diff] [blame] | 500 | * Handle special case for zero-length COMPARE_AND_WRITE |
| 501 | */ |
| 502 | if (!cmd->data_length) |
| 503 | goto out; |
| 504 | /* |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 505 | * Immediately exit + release dev->caw_sem if command has already |
| 506 | * been failed with a non-zero SCSI status. |
| 507 | */ |
| 508 | if (cmd->scsi_status) { |
Nicholas Bellinger | a4e52cc | 2017-04-11 16:24:16 -0700 | [diff] [blame] | 509 | pr_debug("compare_and_write_callback: non zero scsi_status:" |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 510 | " 0x%02x\n", cmd->scsi_status); |
Nicholas Bellinger | a4e52cc | 2017-04-11 16:24:16 -0700 | [diff] [blame] | 511 | *post_ret = 1; |
| 512 | if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION) |
| 513 | ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | db60df8 | 2013-10-01 17:04:40 -0700 | [diff] [blame] | 514 | goto out; |
| 515 | } |
Nicholas Bellinger | cf6d1f0 | 2013-08-21 19:34:43 -0700 | [diff] [blame] | 516 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 517 | buf = kzalloc(cmd->data_length, GFP_KERNEL); |
| 518 | if (!buf) { |
| 519 | pr_err("Unable to allocate compare_and_write buf\n"); |
Nicholas Bellinger | a289008 | 2013-08-21 18:10:04 -0700 | [diff] [blame] | 520 | ret = TCM_OUT_OF_RESOURCES; |
| 521 | goto out; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Martin Svec | a1e1774 | 2014-04-01 16:03:02 +0200 | [diff] [blame] | 524 | write_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents, |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 525 | GFP_KERNEL); |
| 526 | if (!write_sg) { |
| 527 | pr_err("Unable to allocate compare_and_write sg\n"); |
| 528 | ret = TCM_OUT_OF_RESOURCES; |
| 529 | goto out; |
| 530 | } |
Martin Svec | a1e1774 | 2014-04-01 16:03:02 +0200 | [diff] [blame] | 531 | sg_init_table(write_sg, cmd->t_data_nents); |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 532 | /* |
| 533 | * Setup verify and write data payloads from total NumberLBAs. |
| 534 | */ |
| 535 | rc = sg_copy_to_buffer(cmd->t_data_sg, cmd->t_data_nents, buf, |
| 536 | cmd->data_length); |
| 537 | if (!rc) { |
| 538 | pr_err("sg_copy_to_buffer() failed for compare_and_write\n"); |
| 539 | ret = TCM_OUT_OF_RESOURCES; |
| 540 | goto out; |
| 541 | } |
| 542 | /* |
| 543 | * Compare against SCSI READ payload against verify payload |
| 544 | */ |
| 545 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, i) { |
| 546 | addr = (unsigned char *)kmap_atomic(sg_page(sg)); |
| 547 | if (!addr) { |
| 548 | ret = TCM_OUT_OF_RESOURCES; |
| 549 | goto out; |
| 550 | } |
| 551 | |
| 552 | len = min(sg->length, compare_len); |
| 553 | |
| 554 | if (memcmp(addr, buf + offset, len)) { |
| 555 | pr_warn("Detected MISCOMPARE for addr: %p buf: %p\n", |
| 556 | addr, buf + offset); |
| 557 | kunmap_atomic(addr); |
| 558 | goto miscompare; |
| 559 | } |
| 560 | kunmap_atomic(addr); |
| 561 | |
| 562 | offset += len; |
| 563 | compare_len -= len; |
| 564 | if (!compare_len) |
| 565 | break; |
| 566 | } |
| 567 | |
| 568 | i = 0; |
| 569 | len = cmd->t_task_nolb * block_size; |
| 570 | sg_miter_start(&m, cmd->t_data_sg, cmd->t_data_nents, SG_MITER_TO_SG); |
| 571 | /* |
| 572 | * Currently assumes NoLB=1 and SGLs are PAGE_SIZE.. |
| 573 | */ |
| 574 | while (len) { |
| 575 | sg_miter_next(&m); |
| 576 | |
| 577 | if (block_size < PAGE_SIZE) { |
| 578 | sg_set_page(&write_sg[i], m.page, block_size, |
Jan Engelhardt | d94e5a6 | 2015-11-23 17:46:32 +0100 | [diff] [blame] | 579 | m.piter.sg->offset + block_size); |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 580 | } else { |
| 581 | sg_miter_next(&m); |
| 582 | sg_set_page(&write_sg[i], m.page, block_size, |
Jan Engelhardt | d94e5a6 | 2015-11-23 17:46:32 +0100 | [diff] [blame] | 583 | m.piter.sg->offset); |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 584 | } |
| 585 | len -= block_size; |
| 586 | i++; |
| 587 | } |
| 588 | sg_miter_stop(&m); |
| 589 | /* |
| 590 | * Save the original SGL + nents values before updating to new |
| 591 | * assignments, to be released in transport_free_pages() -> |
| 592 | * transport_reset_sgl_orig() |
| 593 | */ |
| 594 | cmd->t_data_sg_orig = cmd->t_data_sg; |
| 595 | cmd->t_data_sg = write_sg; |
| 596 | cmd->t_data_nents_orig = cmd->t_data_nents; |
| 597 | cmd->t_data_nents = 1; |
| 598 | |
Christoph Hellwig | 68d81f4 | 2014-11-24 07:07:25 -0800 | [diff] [blame] | 599 | cmd->sam_task_attr = TCM_HEAD_TAG; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 600 | cmd->transport_complete_callback = compare_and_write_post; |
| 601 | /* |
| 602 | * Now reset ->execute_cmd() to the normal sbc_execute_rw() handler |
| 603 | * for submitting the adjusted SGL to write instance user-data. |
| 604 | */ |
| 605 | cmd->execute_cmd = sbc_execute_rw; |
| 606 | |
| 607 | spin_lock_irq(&cmd->t_state_lock); |
| 608 | cmd->t_state = TRANSPORT_PROCESSING; |
| 609 | cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; |
| 610 | spin_unlock_irq(&cmd->t_state_lock); |
| 611 | |
Nicholas Bellinger | dff0ca9 | 2016-05-17 22:19:10 -0700 | [diff] [blame] | 612 | __target_execute_cmd(cmd, false); |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 613 | |
| 614 | kfree(buf); |
| 615 | return ret; |
| 616 | |
| 617 | miscompare: |
| 618 | pr_warn("Target/%s: Send MISCOMPARE check condition and sense\n", |
| 619 | dev->transport->name); |
| 620 | ret = TCM_MISCOMPARE_VERIFY; |
| 621 | out: |
| 622 | /* |
| 623 | * In the MISCOMPARE or failure case, unlock ->caw_sem obtained in |
| 624 | * sbc_compare_and_write() before the original READ I/O submission. |
| 625 | */ |
| 626 | up(&dev->caw_sem); |
| 627 | kfree(write_sg); |
| 628 | kfree(buf); |
| 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | static sense_reason_t |
| 633 | sbc_compare_and_write(struct se_cmd *cmd) |
| 634 | { |
Christoph Hellwig | 7a971b1 | 2015-06-19 15:10:58 +0200 | [diff] [blame] | 635 | struct sbc_ops *ops = cmd->protocol_data; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 636 | struct se_device *dev = cmd->se_dev; |
| 637 | sense_reason_t ret; |
| 638 | int rc; |
| 639 | /* |
| 640 | * Submit the READ first for COMPARE_AND_WRITE to perform the |
| 641 | * comparision using SGLs at cmd->t_bidi_data_sg.. |
| 642 | */ |
| 643 | rc = down_interruptible(&dev->caw_sem); |
Nicholas Bellinger | ee7619f | 2015-05-19 15:10:44 -0700 | [diff] [blame] | 644 | if (rc != 0) { |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 645 | cmd->transport_complete_callback = NULL; |
| 646 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 647 | } |
Nicholas Bellinger | b719125 | 2013-10-01 16:46:37 -0700 | [diff] [blame] | 648 | /* |
| 649 | * Reset cmd->data_length to individual block_size in order to not |
| 650 | * confuse backend drivers that depend on this value matching the |
| 651 | * size of the I/O being submitted. |
| 652 | */ |
| 653 | cmd->data_length = cmd->t_task_nolb * dev->dev_attrib.block_size; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 654 | |
Christoph Hellwig | 7a971b1 | 2015-06-19 15:10:58 +0200 | [diff] [blame] | 655 | ret = ops->execute_rw(cmd, cmd->t_bidi_data_sg, cmd->t_bidi_data_nents, |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 656 | DMA_FROM_DEVICE); |
| 657 | if (ret) { |
| 658 | cmd->transport_complete_callback = NULL; |
| 659 | up(&dev->caw_sem); |
| 660 | return ret; |
| 661 | } |
| 662 | /* |
| 663 | * Unlock of dev->caw_sem to occur in compare_and_write_callback() |
| 664 | * upon MISCOMPARE, or in compare_and_write_done() upon completion |
| 665 | * of WRITE instance user-data. |
| 666 | */ |
| 667 | return TCM_NO_SENSE; |
| 668 | } |
| 669 | |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 670 | static int |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 671 | sbc_set_prot_op_checks(u8 protect, bool fabric_prot, enum target_prot_type prot_type, |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 672 | bool is_write, struct se_cmd *cmd) |
| 673 | { |
| 674 | if (is_write) { |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 675 | cmd->prot_op = fabric_prot ? TARGET_PROT_DOUT_STRIP : |
| 676 | protect ? TARGET_PROT_DOUT_PASS : |
| 677 | TARGET_PROT_DOUT_INSERT; |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 678 | switch (protect) { |
| 679 | case 0x0: |
| 680 | case 0x3: |
| 681 | cmd->prot_checks = 0; |
| 682 | break; |
| 683 | case 0x1: |
| 684 | case 0x5: |
| 685 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 686 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 687 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; |
| 688 | break; |
| 689 | case 0x2: |
| 690 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 691 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; |
| 692 | break; |
| 693 | case 0x4: |
| 694 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 695 | break; |
| 696 | default: |
| 697 | pr_err("Unsupported protect field %d\n", protect); |
| 698 | return -EINVAL; |
| 699 | } |
| 700 | } else { |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 701 | cmd->prot_op = fabric_prot ? TARGET_PROT_DIN_INSERT : |
| 702 | protect ? TARGET_PROT_DIN_PASS : |
| 703 | TARGET_PROT_DIN_STRIP; |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 704 | switch (protect) { |
| 705 | case 0x0: |
| 706 | case 0x1: |
| 707 | case 0x5: |
| 708 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 709 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 710 | cmd->prot_checks |= TARGET_DIF_CHECK_REFTAG; |
| 711 | break; |
| 712 | case 0x2: |
| 713 | if (prot_type == TARGET_DIF_TYPE1_PROT) |
| 714 | cmd->prot_checks = TARGET_DIF_CHECK_REFTAG; |
| 715 | break; |
| 716 | case 0x3: |
| 717 | cmd->prot_checks = 0; |
| 718 | break; |
| 719 | case 0x4: |
| 720 | cmd->prot_checks = TARGET_DIF_CHECK_GUARD; |
| 721 | break; |
| 722 | default: |
| 723 | pr_err("Unsupported protect field %d\n", protect); |
| 724 | return -EINVAL; |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | return 0; |
| 729 | } |
| 730 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 731 | static sense_reason_t |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 732 | 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] | 733 | u32 sectors, bool is_write) |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 734 | { |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 735 | u8 protect = cdb[1] >> 5; |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 736 | int sp_ops = cmd->se_sess->sup_prot_ops; |
| 737 | int pi_prot_type = dev->dev_attrib.pi_prot_type; |
| 738 | bool fabric_prot = false; |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 739 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 740 | if (!cmd->t_prot_sg || !cmd->t_prot_nents) { |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 741 | if (unlikely(protect && |
| 742 | !dev->dev_attrib.pi_prot_type && !cmd->se_sess->sess_prot_type)) { |
| 743 | pr_err("CDB contains protect bit, but device + fabric does" |
| 744 | " not advertise PROTECT=1 feature bit\n"); |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 745 | return TCM_INVALID_CDB_FIELD; |
| 746 | } |
| 747 | if (cmd->prot_pto) |
| 748 | return TCM_NO_SENSE; |
| 749 | } |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 750 | |
| 751 | switch (dev->dev_attrib.pi_prot_type) { |
| 752 | case TARGET_DIF_TYPE3_PROT: |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 753 | cmd->reftag_seed = 0xffffffff; |
| 754 | break; |
| 755 | case TARGET_DIF_TYPE2_PROT: |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 756 | if (protect) |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 757 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 758 | |
| 759 | cmd->reftag_seed = cmd->t_task_lba; |
| 760 | break; |
| 761 | case TARGET_DIF_TYPE1_PROT: |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 762 | cmd->reftag_seed = cmd->t_task_lba; |
| 763 | break; |
| 764 | case TARGET_DIF_TYPE0_PROT: |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 765 | /* |
| 766 | * See if the fabric supports T10-PI, and the session has been |
| 767 | * configured to allow export PROTECT=1 feature bit with backend |
| 768 | * devices that don't support T10-PI. |
| 769 | */ |
| 770 | fabric_prot = is_write ? |
| 771 | !!(sp_ops & (TARGET_PROT_DOUT_PASS | TARGET_PROT_DOUT_STRIP)) : |
| 772 | !!(sp_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DIN_INSERT)); |
| 773 | |
| 774 | if (fabric_prot && cmd->se_sess->sess_prot_type) { |
| 775 | pi_prot_type = cmd->se_sess->sess_prot_type; |
| 776 | break; |
| 777 | } |
Nicholas Bellinger | cceca4a | 2015-04-14 11:55:01 -0700 | [diff] [blame] | 778 | if (!protect) |
| 779 | return TCM_NO_SENSE; |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 780 | /* Fallthrough */ |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 781 | default: |
Nicholas Bellinger | cceca4a | 2015-04-14 11:55:01 -0700 | [diff] [blame] | 782 | pr_err("Unable to determine pi_prot_type for CDB: 0x%02x " |
| 783 | "PROTECT: 0x%02x\n", cdb[0], protect); |
| 784 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 785 | } |
| 786 | |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 787 | if (sbc_set_prot_op_checks(protect, fabric_prot, pi_prot_type, is_write, cmd)) |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 788 | return TCM_INVALID_CDB_FIELD; |
Sagi Grimberg | 19f9361 | 2014-02-19 17:50:15 +0200 | [diff] [blame] | 789 | |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 790 | cmd->prot_type = pi_prot_type; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 791 | cmd->prot_length = dev->prot_length * sectors; |
Sagi Grimberg | e2a4f55 | 2014-06-11 12:09:59 +0300 | [diff] [blame] | 792 | |
| 793 | /** |
| 794 | * In case protection information exists over the wire |
| 795 | * we modify command data length to describe pure data. |
| 796 | * The actual transfer length is data length + protection |
| 797 | * length |
| 798 | **/ |
| 799 | if (protect) |
| 800 | cmd->data_length = sectors * dev->dev_attrib.block_size; |
| 801 | |
| 802 | pr_debug("%s: prot_type=%d, data_length=%d, prot_length=%d " |
| 803 | "prot_op=%d prot_checks=%d\n", |
| 804 | __func__, cmd->prot_type, cmd->data_length, cmd->prot_length, |
Sagi Grimberg | 03abad9 | 2014-02-19 17:50:21 +0200 | [diff] [blame] | 805 | cmd->prot_op, cmd->prot_checks); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 806 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 807 | return TCM_NO_SENSE; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 808 | } |
| 809 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 810 | static int |
| 811 | sbc_check_dpofua(struct se_device *dev, struct se_cmd *cmd, unsigned char *cdb) |
| 812 | { |
| 813 | if (cdb[1] & 0x10) { |
Christoph Hellwig | 814e5b4 | 2015-04-20 15:00:30 +0200 | [diff] [blame] | 814 | /* see explanation in spc_emulate_modesense */ |
| 815 | if (!target_check_fua(dev)) { |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 816 | pr_err("Got CDB: 0x%02x with DPO bit set, but device" |
| 817 | " does not advertise support for DPO\n", cdb[0]); |
| 818 | return -EINVAL; |
| 819 | } |
| 820 | } |
| 821 | if (cdb[1] & 0x8) { |
Christoph Hellwig | 814e5b4 | 2015-04-20 15:00:30 +0200 | [diff] [blame] | 822 | if (!target_check_fua(dev)) { |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 823 | pr_err("Got CDB: 0x%02x with FUA bit set, but device" |
| 824 | " does not advertise support for FUA write\n", |
| 825 | cdb[0]); |
| 826 | return -EINVAL; |
| 827 | } |
| 828 | cmd->se_cmd_flags |= SCF_FUA; |
| 829 | } |
| 830 | return 0; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 831 | } |
| 832 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 833 | sense_reason_t |
| 834 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 835 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 836 | struct se_device *dev = cmd->se_dev; |
| 837 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 838 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 839 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 840 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 841 | |
Christoph Hellwig | 7a971b1 | 2015-06-19 15:10:58 +0200 | [diff] [blame] | 842 | cmd->protocol_data = ops; |
| 843 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 844 | switch (cdb[0]) { |
| 845 | case READ_6: |
| 846 | sectors = transport_get_sectors_6(cdb); |
| 847 | cmd->t_task_lba = transport_lba_21(cdb); |
| 848 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 849 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 850 | break; |
| 851 | case READ_10: |
| 852 | sectors = transport_get_sectors_10(cdb); |
| 853 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 854 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 855 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 856 | return TCM_INVALID_CDB_FIELD; |
| 857 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 858 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 859 | if (ret) |
| 860 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 861 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 862 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 863 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 864 | break; |
| 865 | case READ_12: |
| 866 | sectors = transport_get_sectors_12(cdb); |
| 867 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 868 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 869 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 870 | return TCM_INVALID_CDB_FIELD; |
| 871 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 872 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 873 | if (ret) |
| 874 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 875 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 876 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 877 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 878 | break; |
| 879 | case READ_16: |
| 880 | sectors = transport_get_sectors_16(cdb); |
| 881 | cmd->t_task_lba = transport_lba_64(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 882 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 883 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 884 | return TCM_INVALID_CDB_FIELD; |
| 885 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 886 | ret = sbc_check_prot(dev, cmd, cdb, sectors, false); |
| 887 | if (ret) |
| 888 | return ret; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 889 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 890 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 891 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 892 | break; |
| 893 | case WRITE_6: |
| 894 | sectors = transport_get_sectors_6(cdb); |
| 895 | cmd->t_task_lba = transport_lba_21(cdb); |
| 896 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 897 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 898 | break; |
| 899 | case WRITE_10: |
| 900 | case WRITE_VERIFY: |
| 901 | sectors = transport_get_sectors_10(cdb); |
| 902 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 903 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 904 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 905 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 906 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 907 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 908 | if (ret) |
| 909 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 910 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 911 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 912 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 913 | break; |
| 914 | case WRITE_12: |
| 915 | sectors = transport_get_sectors_12(cdb); |
| 916 | cmd->t_task_lba = transport_lba_32(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 917 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 918 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 919 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 920 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 921 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 922 | if (ret) |
| 923 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 924 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 925 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 926 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 927 | break; |
| 928 | case WRITE_16: |
| 929 | sectors = transport_get_sectors_16(cdb); |
| 930 | cmd->t_task_lba = transport_lba_64(cdb); |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 931 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 932 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 933 | return TCM_INVALID_CDB_FIELD; |
Nicholas Bellinger | 499bf77 | 2013-12-23 20:30:03 +0000 | [diff] [blame] | 934 | |
Nicholas Bellinger | f7b7c06 | 2015-02-13 22:49:38 +0000 | [diff] [blame] | 935 | ret = sbc_check_prot(dev, cmd, cdb, sectors, true); |
| 936 | if (ret) |
| 937 | return ret; |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 938 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 939 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 940 | cmd->execute_cmd = sbc_execute_rw; |
| 941 | break; |
| 942 | case XDWRITEREAD_10: |
| 943 | if (cmd->data_direction != DMA_TO_DEVICE || |
| 944 | !(cmd->se_cmd_flags & SCF_BIDI)) |
| 945 | return TCM_INVALID_CDB_FIELD; |
| 946 | sectors = transport_get_sectors_10(cdb); |
| 947 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 948 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 949 | return TCM_INVALID_CDB_FIELD; |
| 950 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 951 | cmd->t_task_lba = transport_lba_32(cdb); |
| 952 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 953 | |
| 954 | /* |
| 955 | * Setup BIDI XOR callback to be run after I/O completion. |
| 956 | */ |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 957 | cmd->execute_cmd = sbc_execute_rw; |
| 958 | cmd->transport_complete_callback = &xdreadwrite_callback; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 959 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 960 | case VARIABLE_LENGTH_CMD: |
| 961 | { |
| 962 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 963 | switch (service_action) { |
| 964 | case XDWRITEREAD_32: |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 965 | sectors = transport_get_sectors_32(cdb); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 966 | |
Nicholas Bellinger | fde9f50 | 2015-02-13 23:28:27 +0000 | [diff] [blame] | 967 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 968 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 969 | /* |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 970 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 971 | * XDWRITE_READ_32 logic. |
| 972 | */ |
| 973 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 974 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 975 | |
| 976 | /* |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 977 | * Setup BIDI XOR callback to be run during after I/O |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 978 | * completion. |
| 979 | */ |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 980 | cmd->execute_cmd = sbc_execute_rw; |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 981 | cmd->transport_complete_callback = &xdreadwrite_callback; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 982 | break; |
| 983 | case WRITE_SAME_32: |
| 984 | sectors = transport_get_sectors_32(cdb); |
| 985 | if (!sectors) { |
| 986 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 987 | " supported\n"); |
| 988 | return TCM_INVALID_CDB_FIELD; |
| 989 | } |
| 990 | |
| 991 | size = sbc_get_size(cmd, 1); |
| 992 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 993 | |
| 994 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
| 995 | if (ret) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 996 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 997 | break; |
| 998 | default: |
| 999 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 1000 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1001 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1002 | } |
| 1003 | break; |
| 1004 | } |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 1005 | case COMPARE_AND_WRITE: |
| 1006 | sectors = cdb[13]; |
| 1007 | /* |
| 1008 | * Currently enforce COMPARE_AND_WRITE for a single sector |
| 1009 | */ |
| 1010 | if (sectors > 1) { |
| 1011 | pr_err("COMPARE_AND_WRITE contains NoLB: %u greater" |
| 1012 | " than 1\n", sectors); |
| 1013 | return TCM_INVALID_CDB_FIELD; |
| 1014 | } |
David Disseldorp | ab81a5e | 2015-07-23 22:33:21 +0200 | [diff] [blame] | 1015 | if (sbc_check_dpofua(dev, cmd, cdb)) |
| 1016 | return TCM_INVALID_CDB_FIELD; |
| 1017 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 1018 | /* |
| 1019 | * Double size because we have two buffers, note that |
| 1020 | * zero is not an error.. |
| 1021 | */ |
| 1022 | size = 2 * sbc_get_size(cmd, sectors); |
| 1023 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 1024 | cmd->t_task_nolb = sectors; |
| 1025 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB | SCF_COMPARE_AND_WRITE; |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 1026 | cmd->execute_cmd = sbc_compare_and_write; |
| 1027 | cmd->transport_complete_callback = compare_and_write_callback; |
| 1028 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1029 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1030 | size = READ_CAP_LEN; |
| 1031 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1032 | break; |
Hannes Reinecke | eb846d9 | 2014-11-17 14:25:19 +0100 | [diff] [blame] | 1033 | case SERVICE_ACTION_IN_16: |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1034 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 1035 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1036 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1037 | break; |
Hannes Reinecke | c66094b | 2013-12-17 09:18:49 +0100 | [diff] [blame] | 1038 | case SAI_REPORT_REFERRALS: |
| 1039 | cmd->execute_cmd = target_emulate_report_referrals; |
| 1040 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1041 | default: |
| 1042 | pr_err("Unsupported SA: 0x%02x\n", |
| 1043 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1044 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1045 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1046 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1047 | (cdb[12] << 8) | cdb[13]; |
| 1048 | break; |
| 1049 | case SYNCHRONIZE_CACHE: |
| 1050 | case SYNCHRONIZE_CACHE_16: |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1051 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 1052 | sectors = transport_get_sectors_10(cdb); |
| 1053 | cmd->t_task_lba = transport_lba_32(cdb); |
| 1054 | } else { |
| 1055 | sectors = transport_get_sectors_16(cdb); |
| 1056 | cmd->t_task_lba = transport_lba_64(cdb); |
| 1057 | } |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 1058 | if (ops->execute_sync_cache) { |
| 1059 | cmd->execute_cmd = ops->execute_sync_cache; |
| 1060 | goto check_lba; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1061 | } |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 1062 | size = 0; |
| 1063 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1064 | break; |
| 1065 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 1066 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1067 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 1068 | |
Nicholas Bellinger | 61fdb4a | 2015-02-14 02:29:50 +0000 | [diff] [blame] | 1069 | if (!dev->dev_attrib.emulate_tpu) { |
| 1070 | pr_err("Got UNMAP, but backend device has" |
| 1071 | " emulate_tpu disabled\n"); |
| 1072 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 1073 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1074 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 1075 | cmd->execute_cmd = sbc_execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1076 | break; |
| 1077 | case WRITE_SAME_16: |
| 1078 | sectors = transport_get_sectors_16(cdb); |
| 1079 | if (!sectors) { |
| 1080 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1081 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1082 | } |
| 1083 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1084 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1085 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 1086 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 1087 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 1088 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 1089 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1090 | break; |
| 1091 | case WRITE_SAME: |
| 1092 | sectors = transport_get_sectors_10(cdb); |
| 1093 | if (!sectors) { |
| 1094 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1095 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1096 | } |
| 1097 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1098 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1099 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 1100 | |
| 1101 | /* |
| 1102 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 1103 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 1104 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 1105 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 1106 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 1107 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1108 | break; |
| 1109 | case VERIFY: |
Max Lohrmann | 033850b | 2017-03-07 22:09:56 -0800 | [diff] [blame] | 1110 | case VERIFY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1111 | size = 0; |
Max Lohrmann | 033850b | 2017-03-07 22:09:56 -0800 | [diff] [blame] | 1112 | if (cdb[0] == VERIFY) { |
| 1113 | sectors = transport_get_sectors_10(cdb); |
| 1114 | cmd->t_task_lba = transport_lba_32(cdb); |
| 1115 | } else { |
| 1116 | sectors = transport_get_sectors_16(cdb); |
| 1117 | cmd->t_task_lba = transport_lba_64(cdb); |
| 1118 | } |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 1119 | cmd->execute_cmd = sbc_emulate_noop; |
Christophe Vu-Brugier | c52716d | 2014-06-10 17:53:22 +0200 | [diff] [blame] | 1120 | goto check_lba; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 1121 | case REZERO_UNIT: |
| 1122 | case SEEK_6: |
| 1123 | case SEEK_10: |
| 1124 | /* |
| 1125 | * There are still clients out there which use these old SCSI-2 |
| 1126 | * commands. This mainly happens when running VMs with legacy |
| 1127 | * guest systems, connected via SCSI command pass-through to |
| 1128 | * iSCSI targets. Make them happy and return status GOOD. |
| 1129 | */ |
| 1130 | size = 0; |
| 1131 | cmd->execute_cmd = sbc_emulate_noop; |
| 1132 | break; |
Brian Bunker | 45182ed | 2015-07-23 15:27:46 -0700 | [diff] [blame] | 1133 | case START_STOP: |
| 1134 | size = 0; |
| 1135 | cmd->execute_cmd = sbc_emulate_startstop; |
| 1136 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1137 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1138 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1139 | if (ret) |
| 1140 | return ret; |
| 1141 | } |
| 1142 | |
| 1143 | /* reject any command that we don't have a handler for */ |
Andy Grover | 20959c4 | 2014-10-01 16:07:02 -0700 | [diff] [blame] | 1144 | if (!cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1145 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1146 | |
| 1147 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1148 | unsigned long long end_lba; |
Christophe Vu-Brugier | 6ef31dc | 2014-06-10 17:53:21 +0200 | [diff] [blame] | 1149 | check_lba: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1150 | end_lba = dev->transport->get_blocks(dev) + 1; |
Nicholas Bellinger | aa17993 | 2015-02-13 22:27:40 +0000 | [diff] [blame] | 1151 | if (((cmd->t_task_lba + sectors) < cmd->t_task_lba) || |
| 1152 | ((cmd->t_task_lba + sectors) > end_lba)) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1153 | pr_err("cmd exceeds last lba %llu " |
| 1154 | "(lba %llu, sectors %u)\n", |
| 1155 | end_lba, cmd->t_task_lba, sectors); |
Roland Dreier | 09ceadc | 2013-06-26 17:36:18 -0700 | [diff] [blame] | 1156 | return TCM_ADDRESS_OUT_OF_RANGE; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 1157 | } |
| 1158 | |
Nicholas Bellinger | 68ff9b9 | 2013-08-19 15:20:28 -0700 | [diff] [blame] | 1159 | if (!(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) |
| 1160 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1161 | } |
| 1162 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 1163 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1164 | } |
| 1165 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 1166 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 1167 | u32 sbc_get_device_type(struct se_device *dev) |
| 1168 | { |
| 1169 | return TYPE_DISK; |
| 1170 | } |
| 1171 | EXPORT_SYMBOL(sbc_get_device_type); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 1172 | |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 1173 | static sense_reason_t |
| 1174 | sbc_execute_unmap(struct se_cmd *cmd) |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 1175 | { |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 1176 | struct sbc_ops *ops = cmd->protocol_data; |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 1177 | struct se_device *dev = cmd->se_dev; |
| 1178 | unsigned char *buf, *ptr = NULL; |
| 1179 | sector_t lba; |
| 1180 | int size; |
| 1181 | u32 range; |
| 1182 | sense_reason_t ret = 0; |
| 1183 | int dl, bd_dl; |
| 1184 | |
| 1185 | /* We never set ANC_SUP */ |
| 1186 | if (cmd->t_task_cdb[1]) |
| 1187 | return TCM_INVALID_CDB_FIELD; |
| 1188 | |
| 1189 | if (cmd->data_length == 0) { |
| 1190 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | if (cmd->data_length < 8) { |
| 1195 | pr_warn("UNMAP parameter list length %u too small\n", |
| 1196 | cmd->data_length); |
| 1197 | return TCM_PARAMETER_LIST_LENGTH_ERROR; |
| 1198 | } |
| 1199 | |
| 1200 | buf = transport_kmap_data_sg(cmd); |
| 1201 | if (!buf) |
| 1202 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 1203 | |
| 1204 | dl = get_unaligned_be16(&buf[0]); |
| 1205 | bd_dl = get_unaligned_be16(&buf[2]); |
| 1206 | |
| 1207 | size = cmd->data_length - 8; |
| 1208 | if (bd_dl > size) |
| 1209 | pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n", |
| 1210 | cmd->data_length, bd_dl); |
| 1211 | else |
| 1212 | size = bd_dl; |
| 1213 | |
| 1214 | if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) { |
| 1215 | ret = TCM_INVALID_PARAMETER_LIST; |
| 1216 | goto err; |
| 1217 | } |
| 1218 | |
| 1219 | /* First UNMAP block descriptor starts at 8 byte offset */ |
| 1220 | ptr = &buf[8]; |
| 1221 | pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u" |
| 1222 | " ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr); |
| 1223 | |
| 1224 | while (size >= 16) { |
| 1225 | lba = get_unaligned_be64(&ptr[0]); |
| 1226 | range = get_unaligned_be32(&ptr[8]); |
| 1227 | pr_debug("UNMAP: Using lba: %llu and range: %u\n", |
| 1228 | (unsigned long long)lba, range); |
| 1229 | |
| 1230 | if (range > dev->dev_attrib.max_unmap_lba_count) { |
| 1231 | ret = TCM_INVALID_PARAMETER_LIST; |
| 1232 | goto err; |
| 1233 | } |
| 1234 | |
| 1235 | if (lba + range > dev->transport->get_blocks(dev) + 1) { |
| 1236 | ret = TCM_ADDRESS_OUT_OF_RANGE; |
| 1237 | goto err; |
| 1238 | } |
| 1239 | |
Christoph Hellwig | 62e4694 | 2015-06-19 15:10:59 +0200 | [diff] [blame] | 1240 | ret = ops->execute_unmap(cmd, lba, range); |
Asias He | 86d7182 | 2013-02-25 14:03:46 +0800 | [diff] [blame] | 1241 | if (ret) |
| 1242 | goto err; |
| 1243 | |
| 1244 | ptr += 16; |
| 1245 | size -= 16; |
| 1246 | } |
| 1247 | |
| 1248 | err: |
| 1249 | transport_kunmap_data_sg(cmd); |
| 1250 | if (!ret) |
| 1251 | target_complete_cmd(cmd, GOOD); |
| 1252 | return ret; |
| 1253 | } |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1254 | |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1255 | void |
| 1256 | sbc_dif_generate(struct se_cmd *cmd) |
| 1257 | { |
| 1258 | struct se_device *dev = cmd->se_dev; |
Sagi Grimberg | fe052a1 | 2015-06-29 13:08:19 +0300 | [diff] [blame] | 1259 | struct t10_pi_tuple *sdt; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1260 | struct scatterlist *dsg = cmd->t_data_sg, *psg; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1261 | sector_t sector = cmd->t_task_lba; |
| 1262 | void *daddr, *paddr; |
| 1263 | int i, j, offset = 0; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1264 | unsigned int block_size = dev->dev_attrib.block_size; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1265 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1266 | for_each_sg(cmd->t_prot_sg, psg, cmd->t_prot_nents, i) { |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1267 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1268 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1269 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1270 | for (j = 0; j < psg->length; |
Sagi Grimberg | fe052a1 | 2015-06-29 13:08:19 +0300 | [diff] [blame] | 1271 | j += sizeof(*sdt)) { |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1272 | __u16 crc; |
| 1273 | unsigned int avail; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1274 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1275 | if (offset >= dsg->length) { |
| 1276 | offset -= dsg->length; |
| 1277 | kunmap_atomic(daddr - dsg->offset); |
| 1278 | dsg = sg_next(dsg); |
| 1279 | if (!dsg) { |
| 1280 | kunmap_atomic(paddr - psg->offset); |
| 1281 | return; |
| 1282 | } |
| 1283 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1284 | } |
| 1285 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1286 | sdt = paddr + j; |
| 1287 | avail = min(block_size, dsg->length - offset); |
| 1288 | crc = crc_t10dif(daddr + offset, avail); |
| 1289 | if (avail < block_size) { |
| 1290 | kunmap_atomic(daddr - dsg->offset); |
| 1291 | dsg = sg_next(dsg); |
| 1292 | if (!dsg) { |
| 1293 | kunmap_atomic(paddr - psg->offset); |
| 1294 | return; |
| 1295 | } |
| 1296 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
| 1297 | offset = block_size - avail; |
| 1298 | crc = crc_t10dif_update(crc, daddr, offset); |
| 1299 | } else { |
| 1300 | offset += block_size; |
| 1301 | } |
| 1302 | |
| 1303 | sdt->guard_tag = cpu_to_be16(crc); |
Nicholas Bellinger | 823ddd8 | 2015-02-27 22:42:11 -0800 | [diff] [blame] | 1304 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT) |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1305 | sdt->ref_tag = cpu_to_be32(sector & 0xffffffff); |
| 1306 | sdt->app_tag = 0; |
| 1307 | |
Nicholas Bellinger | 6ae5040 | 2015-04-14 11:59:20 -0700 | [diff] [blame] | 1308 | pr_debug("DIF %s INSERT sector: %llu guard_tag: 0x%04x" |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1309 | " app_tag: 0x%04x ref_tag: %u\n", |
Nicholas Bellinger | 6ae5040 | 2015-04-14 11:59:20 -0700 | [diff] [blame] | 1310 | (cmd->data_direction == DMA_TO_DEVICE) ? |
| 1311 | "WRITE" : "READ", (unsigned long long)sector, |
| 1312 | sdt->guard_tag, sdt->app_tag, |
| 1313 | be32_to_cpu(sdt->ref_tag)); |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1314 | |
| 1315 | sector++; |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1316 | } |
| 1317 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1318 | kunmap_atomic(daddr - dsg->offset); |
| 1319 | kunmap_atomic(paddr - psg->offset); |
Nicholas Bellinger | 66a3d5b | 2014-04-02 14:19:09 -0700 | [diff] [blame] | 1320 | } |
| 1321 | } |
| 1322 | |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1323 | static sense_reason_t |
Sagi Grimberg | fe052a1 | 2015-06-29 13:08:19 +0300 | [diff] [blame] | 1324 | sbc_dif_v1_verify(struct se_cmd *cmd, struct t10_pi_tuple *sdt, |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1325 | __u16 crc, sector_t sector, unsigned int ei_lba) |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1326 | { |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1327 | __be16 csum; |
| 1328 | |
Nicholas Bellinger | d7a463b | 2015-04-14 11:57:43 -0700 | [diff] [blame] | 1329 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_GUARD)) |
| 1330 | goto check_ref; |
| 1331 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1332 | csum = cpu_to_be16(crc); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1333 | |
| 1334 | if (sdt->guard_tag != csum) { |
| 1335 | pr_err("DIFv1 checksum failed on sector %llu guard tag 0x%04x" |
| 1336 | " csum 0x%04x\n", (unsigned long long)sector, |
| 1337 | be16_to_cpu(sdt->guard_tag), be16_to_cpu(csum)); |
| 1338 | return TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED; |
| 1339 | } |
| 1340 | |
Nicholas Bellinger | d7a463b | 2015-04-14 11:57:43 -0700 | [diff] [blame] | 1341 | check_ref: |
| 1342 | if (!(cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)) |
| 1343 | return 0; |
| 1344 | |
Nicholas Bellinger | 823ddd8 | 2015-02-27 22:42:11 -0800 | [diff] [blame] | 1345 | if (cmd->prot_type == TARGET_DIF_TYPE1_PROT && |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1346 | be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { |
| 1347 | pr_err("DIFv1 Type 1 reference failed on sector: %llu tag: 0x%08x" |
| 1348 | " sector MSB: 0x%08x\n", (unsigned long long)sector, |
| 1349 | be32_to_cpu(sdt->ref_tag), (u32)(sector & 0xffffffff)); |
| 1350 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; |
| 1351 | } |
| 1352 | |
Nicholas Bellinger | 823ddd8 | 2015-02-27 22:42:11 -0800 | [diff] [blame] | 1353 | if (cmd->prot_type == TARGET_DIF_TYPE2_PROT && |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1354 | be32_to_cpu(sdt->ref_tag) != ei_lba) { |
| 1355 | pr_err("DIFv1 Type 2 reference failed on sector: %llu tag: 0x%08x" |
| 1356 | " ei_lba: 0x%08x\n", (unsigned long long)sector, |
| 1357 | be32_to_cpu(sdt->ref_tag), ei_lba); |
| 1358 | return TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED; |
| 1359 | } |
| 1360 | |
| 1361 | return 0; |
| 1362 | } |
| 1363 | |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 1364 | void sbc_dif_copy_prot(struct se_cmd *cmd, unsigned int sectors, bool read, |
| 1365 | struct scatterlist *sg, int sg_off) |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1366 | { |
| 1367 | struct se_device *dev = cmd->se_dev; |
| 1368 | struct scatterlist *psg; |
| 1369 | void *paddr, *addr; |
| 1370 | unsigned int i, len, left; |
Nicholas Bellinger | 10762e8 | 2014-02-23 12:52:44 +0000 | [diff] [blame] | 1371 | unsigned int offset = sg_off; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1372 | |
Nicholas Bellinger | 38b57f8 | 2015-02-27 22:05:21 -0800 | [diff] [blame] | 1373 | if (!sg) |
| 1374 | return; |
| 1375 | |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1376 | left = sectors * dev->prot_length; |
| 1377 | |
| 1378 | 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] | 1379 | unsigned int psg_len, copied = 0; |
Sagi Grimberg | d6a65fd | 2014-02-12 11:40:25 +0200 | [diff] [blame] | 1380 | |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1381 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1382 | psg_len = min(left, psg->length); |
| 1383 | while (psg_len) { |
| 1384 | len = min(psg_len, sg->length - offset); |
| 1385 | addr = kmap_atomic(sg_page(sg)) + sg->offset + offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1386 | |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1387 | if (read) |
| 1388 | memcpy(paddr + copied, addr, len); |
| 1389 | else |
| 1390 | memcpy(addr, paddr + copied, len); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1391 | |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1392 | left -= len; |
| 1393 | offset += len; |
| 1394 | copied += len; |
| 1395 | psg_len -= len; |
| 1396 | |
Akinobu Mita | 5763638 | 2015-05-01 15:23:48 +0900 | [diff] [blame] | 1397 | kunmap_atomic(addr - sg->offset - offset); |
| 1398 | |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1399 | if (offset >= sg->length) { |
| 1400 | sg = sg_next(sg); |
| 1401 | offset = 0; |
| 1402 | } |
Sagi Grimberg | 16c0ae0 | 2014-03-05 14:05:09 +0200 | [diff] [blame] | 1403 | } |
Akinobu Mita | 5763638 | 2015-05-01 15:23:48 +0900 | [diff] [blame] | 1404 | kunmap_atomic(paddr - psg->offset); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1405 | } |
| 1406 | } |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 1407 | EXPORT_SYMBOL(sbc_dif_copy_prot); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1408 | |
| 1409 | sense_reason_t |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 1410 | sbc_dif_verify(struct se_cmd *cmd, sector_t start, unsigned int sectors, |
Sagi Grimberg | 414e4627 | 2015-04-19 20:27:21 +0300 | [diff] [blame] | 1411 | unsigned int ei_lba, struct scatterlist *psg, int psg_off) |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1412 | { |
| 1413 | struct se_device *dev = cmd->se_dev; |
Sagi Grimberg | fe052a1 | 2015-06-29 13:08:19 +0300 | [diff] [blame] | 1414 | struct t10_pi_tuple *sdt; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1415 | struct scatterlist *dsg = cmd->t_data_sg; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1416 | sector_t sector = start; |
| 1417 | void *daddr, *paddr; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1418 | int i; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1419 | sense_reason_t rc; |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1420 | int dsg_off = 0; |
| 1421 | unsigned int block_size = dev->dev_attrib.block_size; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1422 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1423 | for (; psg && sector < start + sectors; psg = sg_next(psg)) { |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1424 | paddr = kmap_atomic(sg_page(psg)) + psg->offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1425 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1426 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1427 | for (i = psg_off; i < psg->length && |
| 1428 | sector < start + sectors; |
Sagi Grimberg | fe052a1 | 2015-06-29 13:08:19 +0300 | [diff] [blame] | 1429 | i += sizeof(*sdt)) { |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1430 | __u16 crc; |
| 1431 | unsigned int avail; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1432 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1433 | if (dsg_off >= dsg->length) { |
| 1434 | dsg_off -= dsg->length; |
| 1435 | kunmap_atomic(daddr - dsg->offset); |
| 1436 | dsg = sg_next(dsg); |
| 1437 | if (!dsg) { |
| 1438 | kunmap_atomic(paddr - psg->offset); |
| 1439 | return 0; |
| 1440 | } |
| 1441 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1442 | } |
| 1443 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1444 | sdt = paddr + i; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1445 | |
| 1446 | pr_debug("DIF READ sector: %llu guard_tag: 0x%04x" |
| 1447 | " app_tag: 0x%04x ref_tag: %u\n", |
| 1448 | (unsigned long long)sector, sdt->guard_tag, |
| 1449 | sdt->app_tag, be32_to_cpu(sdt->ref_tag)); |
| 1450 | |
| 1451 | if (sdt->app_tag == cpu_to_be16(0xffff)) { |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1452 | dsg_off += block_size; |
| 1453 | goto next; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1454 | } |
| 1455 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1456 | avail = min(block_size, dsg->length - dsg_off); |
| 1457 | crc = crc_t10dif(daddr + dsg_off, avail); |
| 1458 | if (avail < block_size) { |
Sagi Grimberg | 414e4627 | 2015-04-19 20:27:21 +0300 | [diff] [blame] | 1459 | kunmap_atomic(daddr - dsg->offset); |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1460 | dsg = sg_next(dsg); |
| 1461 | if (!dsg) { |
| 1462 | kunmap_atomic(paddr - psg->offset); |
| 1463 | return 0; |
| 1464 | } |
| 1465 | daddr = kmap_atomic(sg_page(dsg)) + dsg->offset; |
| 1466 | dsg_off = block_size - avail; |
| 1467 | crc = crc_t10dif_update(crc, daddr, dsg_off); |
| 1468 | } else { |
| 1469 | dsg_off += block_size; |
| 1470 | } |
| 1471 | |
| 1472 | rc = sbc_dif_v1_verify(cmd, sdt, crc, sector, ei_lba); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1473 | if (rc) { |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1474 | kunmap_atomic(daddr - dsg->offset); |
| 1475 | kunmap_atomic(paddr - psg->offset); |
Sagi Grimberg | 76736db | 2014-01-23 19:29:38 +0200 | [diff] [blame] | 1476 | cmd->bad_sector = sector; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1477 | return rc; |
| 1478 | } |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1479 | next: |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1480 | sector++; |
| 1481 | ei_lba++; |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1482 | } |
| 1483 | |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1484 | psg_off = 0; |
Sagi Grimberg | 414e4627 | 2015-04-19 20:27:21 +0300 | [diff] [blame] | 1485 | kunmap_atomic(daddr - dsg->offset); |
Akinobu Mita | 18213af | 2015-05-01 15:23:51 +0900 | [diff] [blame] | 1486 | kunmap_atomic(paddr - psg->offset); |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1487 | } |
Nicholas Bellinger | 41861fa | 2014-01-07 22:44:57 +0000 | [diff] [blame] | 1488 | |
| 1489 | return 0; |
| 1490 | } |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 1491 | EXPORT_SYMBOL(sbc_dif_verify); |