Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 1 | /* |
| 2 | * SCSI Block Commands (SBC) parsing and emulation. |
| 3 | * |
Nicholas Bellinger | fd9a11d | 2012-11-09 14:51:48 -0800 | [diff] [blame] | 4 | * (c) Copyright 2002-2012 RisingTide Systems LLC. |
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> |
| 26 | #include <asm/unaligned.h> |
| 27 | #include <scsi/scsi.h> |
| 28 | |
| 29 | #include <target/target_core_base.h> |
| 30 | #include <target/target_core_backend.h> |
| 31 | #include <target/target_core_fabric.h> |
| 32 | |
| 33 | #include "target_core_internal.h" |
| 34 | #include "target_core_ua.h" |
| 35 | |
| 36 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 37 | static sense_reason_t |
| 38 | sbc_emulate_readcapacity(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 39 | { |
| 40 | struct se_device *dev = cmd->se_dev; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 41 | unsigned long long blocks_long = dev->transport->get_blocks(dev); |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 42 | unsigned char *rbuf; |
| 43 | unsigned char buf[8]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 44 | u32 blocks; |
| 45 | |
| 46 | if (blocks_long >= 0x00000000ffffffff) |
| 47 | blocks = 0xffffffff; |
| 48 | else |
| 49 | blocks = (u32)blocks_long; |
| 50 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 51 | buf[0] = (blocks >> 24) & 0xff; |
| 52 | buf[1] = (blocks >> 16) & 0xff; |
| 53 | buf[2] = (blocks >> 8) & 0xff; |
| 54 | buf[3] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 55 | buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 56 | buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 57 | buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 58 | buf[7] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 59 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 60 | rbuf = transport_kmap_data_sg(cmd); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 61 | if (!rbuf) |
| 62 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 63 | |
| 64 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 65 | transport_kunmap_data_sg(cmd); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 66 | |
| 67 | target_complete_cmd(cmd, GOOD); |
| 68 | return 0; |
| 69 | } |
| 70 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 71 | static sense_reason_t |
| 72 | sbc_emulate_readcapacity_16(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 73 | { |
| 74 | struct se_device *dev = cmd->se_dev; |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 75 | unsigned char *rbuf; |
| 76 | unsigned char buf[32]; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 77 | unsigned long long blocks = dev->transport->get_blocks(dev); |
| 78 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 79 | memset(buf, 0, sizeof(buf)); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 80 | buf[0] = (blocks >> 56) & 0xff; |
| 81 | buf[1] = (blocks >> 48) & 0xff; |
| 82 | buf[2] = (blocks >> 40) & 0xff; |
| 83 | buf[3] = (blocks >> 32) & 0xff; |
| 84 | buf[4] = (blocks >> 24) & 0xff; |
| 85 | buf[5] = (blocks >> 16) & 0xff; |
| 86 | buf[6] = (blocks >> 8) & 0xff; |
| 87 | buf[7] = blocks & 0xff; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 88 | buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff; |
| 89 | buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff; |
| 90 | buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff; |
| 91 | buf[11] = dev->dev_attrib.block_size & 0xff; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 92 | /* |
| 93 | * Set Thin Provisioning Enable bit following sbc3r22 in section |
| 94 | * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled. |
| 95 | */ |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 96 | if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 97 | buf[14] = 0x80; |
| 98 | |
Paolo Bonzini | a50da14 | 2012-09-07 17:30:40 +0200 | [diff] [blame] | 99 | rbuf = transport_kmap_data_sg(cmd); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 100 | if (!rbuf) |
| 101 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 102 | |
| 103 | memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length)); |
| 104 | transport_kunmap_data_sg(cmd); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 105 | |
| 106 | target_complete_cmd(cmd, GOOD); |
| 107 | return 0; |
| 108 | } |
| 109 | |
Nicholas Bellinger | ffe0067 | 2012-11-27 19:07:52 -0800 | [diff] [blame] | 110 | sector_t spc_get_write_same_sectors(struct se_cmd *cmd) |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 111 | { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 112 | u32 num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 113 | |
| 114 | if (cmd->t_task_cdb[0] == WRITE_SAME) |
| 115 | num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]); |
| 116 | else if (cmd->t_task_cdb[0] == WRITE_SAME_16) |
| 117 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]); |
| 118 | else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */ |
| 119 | num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]); |
| 120 | |
| 121 | /* |
| 122 | * Use the explicit range when non zero is supplied, otherwise calculate |
| 123 | * the remaining range based on ->get_blocks() - starting LBA. |
| 124 | */ |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 125 | if (num_blocks) |
| 126 | return num_blocks; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 127 | |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 128 | return cmd->se_dev->transport->get_blocks(cmd->se_dev) - |
| 129 | cmd->t_task_lba + 1; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 130 | } |
Christoph Hellwig | 6f974e8 | 2012-06-17 18:40:54 -0400 | [diff] [blame] | 131 | EXPORT_SYMBOL(spc_get_write_same_sectors); |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 132 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 133 | static sense_reason_t |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 134 | sbc_emulate_noop(struct se_cmd *cmd) |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 135 | { |
| 136 | target_complete_cmd(cmd, GOOD); |
| 137 | return 0; |
| 138 | } |
| 139 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 140 | static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors) |
| 141 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 142 | return cmd->se_dev->dev_attrib.block_size * sectors; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | static int sbc_check_valid_sectors(struct se_cmd *cmd) |
| 146 | { |
| 147 | struct se_device *dev = cmd->se_dev; |
| 148 | unsigned long long end_lba; |
| 149 | u32 sectors; |
| 150 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 151 | sectors = cmd->data_length / dev->dev_attrib.block_size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 152 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 153 | |
| 154 | if (cmd->t_task_lba + sectors > end_lba) { |
| 155 | pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n", |
| 156 | cmd->t_task_lba, sectors, end_lba); |
| 157 | return -EINVAL; |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static inline u32 transport_get_sectors_6(unsigned char *cdb) |
| 164 | { |
| 165 | /* |
| 166 | * Use 8-bit sector value. SBC-3 says: |
| 167 | * |
| 168 | * A TRANSFER LENGTH field set to zero specifies that 256 |
| 169 | * logical blocks shall be written. Any other value |
| 170 | * specifies the number of logical blocks that shall be |
| 171 | * written. |
| 172 | */ |
| 173 | return cdb[4] ? : 256; |
| 174 | } |
| 175 | |
| 176 | static inline u32 transport_get_sectors_10(unsigned char *cdb) |
| 177 | { |
| 178 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 179 | } |
| 180 | |
| 181 | static inline u32 transport_get_sectors_12(unsigned char *cdb) |
| 182 | { |
| 183 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 184 | } |
| 185 | |
| 186 | static inline u32 transport_get_sectors_16(unsigned char *cdb) |
| 187 | { |
| 188 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 189 | (cdb[12] << 8) + cdb[13]; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 194 | */ |
| 195 | static inline u32 transport_get_sectors_32(unsigned char *cdb) |
| 196 | { |
| 197 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 198 | (cdb[30] << 8) + cdb[31]; |
| 199 | |
| 200 | } |
| 201 | |
| 202 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 203 | { |
| 204 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 205 | } |
| 206 | |
| 207 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 208 | { |
| 209 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 210 | } |
| 211 | |
| 212 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 213 | { |
| 214 | unsigned int __v1, __v2; |
| 215 | |
| 216 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 217 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 218 | |
| 219 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 224 | */ |
| 225 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 226 | { |
| 227 | unsigned int __v1, __v2; |
| 228 | |
| 229 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 230 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 231 | |
| 232 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 233 | } |
| 234 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 235 | static sense_reason_t |
| 236 | 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] | 237 | { |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 238 | unsigned int sectors = spc_get_write_same_sectors(cmd); |
| 239 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 240 | if ((flags[0] & 0x04) || (flags[0] & 0x02)) { |
| 241 | pr_err("WRITE_SAME PBDATA and LBDATA" |
| 242 | " bits not supported for Block Discard" |
| 243 | " Emulation\n"); |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 244 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 245 | } |
Nicholas Bellinger | 773cbaf | 2012-11-15 11:02:49 -0800 | [diff] [blame] | 246 | if (sectors > cmd->se_dev->dev_attrib.max_write_same_len) { |
| 247 | pr_warn("WRITE_SAME sectors: %u exceeds max_write_same_len: %u\n", |
| 248 | sectors, cmd->se_dev->dev_attrib.max_write_same_len); |
| 249 | return TCM_INVALID_CDB_FIELD; |
| 250 | } |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 251 | /* |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 252 | * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting |
| 253 | * translated into block discard requests within backend code. |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 254 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 255 | if (flags[0] & 0x08) { |
| 256 | if (!ops->execute_write_same_unmap) |
| 257 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 258 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 259 | cmd->execute_cmd = ops->execute_write_same_unmap; |
| 260 | return 0; |
| 261 | } |
| 262 | if (!ops->execute_write_same) |
| 263 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
| 264 | |
| 265 | cmd->execute_cmd = ops->execute_write_same; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static void xdreadwrite_callback(struct se_cmd *cmd) |
| 270 | { |
| 271 | unsigned char *buf, *addr; |
| 272 | struct scatterlist *sg; |
| 273 | unsigned int offset; |
| 274 | int i; |
| 275 | int count; |
| 276 | /* |
| 277 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 278 | * |
| 279 | * 1) read the specified logical block(s); |
| 280 | * 2) transfer logical blocks from the data-out buffer; |
| 281 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 282 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 283 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 284 | * blocks transferred from the data-out buffer; and |
| 285 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 286 | */ |
| 287 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 288 | if (!buf) { |
| 289 | pr_err("Unable to allocate xor_callback buf\n"); |
| 290 | return; |
| 291 | } |
| 292 | /* |
| 293 | * Copy the scatterlist WRITE buffer located at cmd->t_data_sg |
| 294 | * into the locally allocated *buf |
| 295 | */ |
| 296 | sg_copy_to_buffer(cmd->t_data_sg, |
| 297 | cmd->t_data_nents, |
| 298 | buf, |
| 299 | cmd->data_length); |
| 300 | |
| 301 | /* |
| 302 | * Now perform the XOR against the BIDI read memory located at |
| 303 | * cmd->t_mem_bidi_list |
| 304 | */ |
| 305 | |
| 306 | offset = 0; |
| 307 | for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) { |
| 308 | addr = kmap_atomic(sg_page(sg)); |
| 309 | if (!addr) |
| 310 | goto out; |
| 311 | |
| 312 | for (i = 0; i < sg->length; i++) |
| 313 | *(addr + sg->offset + i) ^= *(buf + offset + i); |
| 314 | |
| 315 | offset += sg->length; |
| 316 | kunmap_atomic(addr); |
| 317 | } |
| 318 | |
| 319 | out: |
| 320 | kfree(buf); |
| 321 | } |
| 322 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 323 | sense_reason_t |
| 324 | sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops) |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 325 | { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 326 | struct se_device *dev = cmd->se_dev; |
| 327 | unsigned char *cdb = cmd->t_task_cdb; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 328 | unsigned int size; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 329 | u32 sectors = 0; |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 330 | sense_reason_t ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 331 | |
| 332 | switch (cdb[0]) { |
| 333 | case READ_6: |
| 334 | sectors = transport_get_sectors_6(cdb); |
| 335 | cmd->t_task_lba = transport_lba_21(cdb); |
| 336 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 337 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 338 | break; |
| 339 | case READ_10: |
| 340 | sectors = transport_get_sectors_10(cdb); |
| 341 | cmd->t_task_lba = transport_lba_32(cdb); |
| 342 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 343 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 344 | break; |
| 345 | case READ_12: |
| 346 | sectors = transport_get_sectors_12(cdb); |
| 347 | cmd->t_task_lba = transport_lba_32(cdb); |
| 348 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 349 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 350 | break; |
| 351 | case READ_16: |
| 352 | sectors = transport_get_sectors_16(cdb); |
| 353 | cmd->t_task_lba = transport_lba_64(cdb); |
| 354 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 355 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 356 | break; |
| 357 | case WRITE_6: |
| 358 | sectors = transport_get_sectors_6(cdb); |
| 359 | cmd->t_task_lba = transport_lba_21(cdb); |
| 360 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 361 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 362 | break; |
| 363 | case WRITE_10: |
| 364 | case WRITE_VERIFY: |
| 365 | sectors = transport_get_sectors_10(cdb); |
| 366 | cmd->t_task_lba = transport_lba_32(cdb); |
| 367 | if (cdb[1] & 0x8) |
| 368 | cmd->se_cmd_flags |= SCF_FUA; |
| 369 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 370 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 371 | break; |
| 372 | case WRITE_12: |
| 373 | sectors = transport_get_sectors_12(cdb); |
| 374 | cmd->t_task_lba = transport_lba_32(cdb); |
| 375 | if (cdb[1] & 0x8) |
| 376 | cmd->se_cmd_flags |= SCF_FUA; |
| 377 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 378 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 379 | break; |
| 380 | case WRITE_16: |
| 381 | sectors = transport_get_sectors_16(cdb); |
| 382 | cmd->t_task_lba = transport_lba_64(cdb); |
| 383 | if (cdb[1] & 0x8) |
| 384 | cmd->se_cmd_flags |= SCF_FUA; |
| 385 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 386 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 387 | break; |
| 388 | case XDWRITEREAD_10: |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 389 | if (cmd->data_direction != DMA_TO_DEVICE || |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 390 | !(cmd->se_cmd_flags & SCF_BIDI)) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 391 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 392 | sectors = transport_get_sectors_10(cdb); |
| 393 | |
| 394 | cmd->t_task_lba = transport_lba_32(cdb); |
| 395 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 396 | |
| 397 | /* |
| 398 | * Setup BIDI XOR callback to be run after I/O completion. |
| 399 | */ |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 400 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 401 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 402 | if (cdb[1] & 0x8) |
| 403 | cmd->se_cmd_flags |= SCF_FUA; |
| 404 | break; |
| 405 | case VARIABLE_LENGTH_CMD: |
| 406 | { |
| 407 | u16 service_action = get_unaligned_be16(&cdb[8]); |
| 408 | switch (service_action) { |
| 409 | case XDWRITEREAD_32: |
| 410 | sectors = transport_get_sectors_32(cdb); |
| 411 | |
| 412 | /* |
| 413 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 414 | * XDWRITE_READ_32 logic. |
| 415 | */ |
| 416 | cmd->t_task_lba = transport_lba_64_ext(cdb); |
| 417 | cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB; |
| 418 | |
| 419 | /* |
| 420 | * Setup BIDI XOR callback to be run during after I/O |
| 421 | * completion. |
| 422 | */ |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 423 | cmd->execute_cmd = ops->execute_rw; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 424 | cmd->transport_complete_callback = &xdreadwrite_callback; |
| 425 | if (cdb[1] & 0x8) |
| 426 | cmd->se_cmd_flags |= SCF_FUA; |
| 427 | break; |
| 428 | case WRITE_SAME_32: |
| 429 | sectors = transport_get_sectors_32(cdb); |
| 430 | if (!sectors) { |
| 431 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not" |
| 432 | " supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 433 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 434 | } |
| 435 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 436 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 437 | cmd->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 438 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 439 | ret = sbc_setup_write_same(cmd, &cdb[10], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 440 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 441 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 442 | break; |
| 443 | default: |
| 444 | pr_err("VARIABLE_LENGTH_CMD service action" |
| 445 | " 0x%04x not supported\n", service_action); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 446 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 447 | } |
| 448 | break; |
| 449 | } |
| 450 | case READ_CAPACITY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 451 | size = READ_CAP_LEN; |
| 452 | cmd->execute_cmd = sbc_emulate_readcapacity; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 453 | break; |
| 454 | case SERVICE_ACTION_IN: |
| 455 | switch (cmd->t_task_cdb[1] & 0x1f) { |
| 456 | case SAI_READ_CAPACITY_16: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 457 | cmd->execute_cmd = sbc_emulate_readcapacity_16; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 458 | break; |
| 459 | default: |
| 460 | pr_err("Unsupported SA: 0x%02x\n", |
| 461 | cmd->t_task_cdb[1] & 0x1f); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 462 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 463 | } |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 464 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 465 | (cdb[12] << 8) | cdb[13]; |
| 466 | break; |
| 467 | case SYNCHRONIZE_CACHE: |
| 468 | case SYNCHRONIZE_CACHE_16: |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 469 | if (!ops->execute_sync_cache) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 470 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 471 | |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 472 | /* |
| 473 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE |
| 474 | */ |
| 475 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 476 | sectors = transport_get_sectors_10(cdb); |
| 477 | cmd->t_task_lba = transport_lba_32(cdb); |
| 478 | } else { |
| 479 | sectors = transport_get_sectors_16(cdb); |
| 480 | cmd->t_task_lba = transport_lba_64(cdb); |
| 481 | } |
| 482 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 483 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 484 | |
| 485 | /* |
| 486 | * Check to ensure that LBA + Range does not exceed past end of |
| 487 | * device for IBLOCK and FILEIO ->do_sync_cache() backend calls |
| 488 | */ |
| 489 | if (cmd->t_task_lba || sectors) { |
| 490 | if (sbc_check_valid_sectors(cmd) < 0) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 491 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 492 | } |
Christoph Hellwig | ad67f0d | 2012-06-17 18:40:53 -0400 | [diff] [blame] | 493 | cmd->execute_cmd = ops->execute_sync_cache; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 494 | break; |
| 495 | case UNMAP: |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 496 | if (!ops->execute_unmap) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 497 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 498 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 499 | size = get_unaligned_be16(&cdb[7]); |
Christoph Hellwig | 14150a6 | 2012-06-17 18:40:55 -0400 | [diff] [blame] | 500 | cmd->execute_cmd = ops->execute_unmap; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 501 | break; |
| 502 | case WRITE_SAME_16: |
| 503 | sectors = transport_get_sectors_16(cdb); |
| 504 | if (!sectors) { |
| 505 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 506 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 507 | } |
| 508 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 509 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 510 | cmd->t_task_lba = get_unaligned_be64(&cdb[2]); |
| 511 | |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 512 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 513 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 514 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 515 | break; |
| 516 | case WRITE_SAME: |
| 517 | sectors = transport_get_sectors_10(cdb); |
| 518 | if (!sectors) { |
| 519 | pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n"); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 520 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 521 | } |
| 522 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 523 | size = sbc_get_size(cmd, 1); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 524 | cmd->t_task_lba = get_unaligned_be32(&cdb[2]); |
| 525 | |
| 526 | /* |
| 527 | * Follow sbcr26 with WRITE_SAME (10) and check for the existence |
| 528 | * of byte 1 bit 3 UNMAP instead of original reserved field |
| 529 | */ |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 530 | ret = sbc_setup_write_same(cmd, &cdb[1], ops); |
Dan Carpenter | 6b64e1f | 2012-11-27 17:27:01 +0300 | [diff] [blame] | 531 | if (ret) |
Nicholas Bellinger | cd063be | 2012-11-07 20:01:10 -0800 | [diff] [blame] | 532 | return ret; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 533 | break; |
| 534 | case VERIFY: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 535 | size = 0; |
Nicholas Bellinger | 1920ed6 | 2012-11-06 20:59:41 -0800 | [diff] [blame] | 536 | cmd->execute_cmd = sbc_emulate_noop; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 537 | break; |
Bernhard Kohl | 1a1ff38 | 2012-10-24 15:53:58 +0200 | [diff] [blame] | 538 | case REZERO_UNIT: |
| 539 | case SEEK_6: |
| 540 | case SEEK_10: |
| 541 | /* |
| 542 | * There are still clients out there which use these old SCSI-2 |
| 543 | * commands. This mainly happens when running VMs with legacy |
| 544 | * guest systems, connected via SCSI command pass-through to |
| 545 | * iSCSI targets. Make them happy and return status GOOD. |
| 546 | */ |
| 547 | size = 0; |
| 548 | cmd->execute_cmd = sbc_emulate_noop; |
| 549 | break; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 550 | default: |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 551 | ret = spc_parse_cdb(cmd, &size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 552 | if (ret) |
| 553 | return ret; |
| 554 | } |
| 555 | |
| 556 | /* reject any command that we don't have a handler for */ |
| 557 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 558 | return TCM_UNSUPPORTED_SCSI_OPCODE; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 559 | |
| 560 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) { |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 561 | unsigned long long end_lba; |
| 562 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 563 | if (sectors > dev->dev_attrib.fabric_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 564 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 565 | " big sectors %u exceeds fabric_max_sectors:" |
| 566 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 567 | dev->dev_attrib.fabric_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 568 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 569 | } |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 570 | if (sectors > dev->dev_attrib.hw_max_sectors) { |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 571 | printk_ratelimited(KERN_ERR "SCSI OP %02xh with too" |
| 572 | " big sectors %u exceeds backend hw_max_sectors:" |
| 573 | " %u\n", cdb[0], sectors, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 574 | dev->dev_attrib.hw_max_sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 575 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 576 | } |
| 577 | |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 578 | end_lba = dev->transport->get_blocks(dev) + 1; |
| 579 | if (cmd->t_task_lba + sectors > end_lba) { |
| 580 | pr_err("cmd exceeds last lba %llu " |
| 581 | "(lba %llu, sectors %u)\n", |
| 582 | end_lba, cmd->t_task_lba, sectors); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 583 | return TCM_INVALID_CDB_FIELD; |
Christoph Hellwig | 1fd032e | 2012-05-20 11:59:15 -0400 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | size = sbc_get_size(cmd, sectors); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 587 | } |
| 588 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 589 | return target_cmd_size_check(cmd, size); |
Christoph Hellwig | d6e0175 | 2012-05-20 11:59:14 -0400 | [diff] [blame] | 590 | } |
| 591 | EXPORT_SYMBOL(sbc_parse_cdb); |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 592 | |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 593 | u32 sbc_get_device_type(struct se_device *dev) |
| 594 | { |
| 595 | return TYPE_DISK; |
| 596 | } |
| 597 | EXPORT_SYMBOL(sbc_get_device_type); |