Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 2 | /******************************************************************************* |
| 3 | * This file contains the iSCSI Target DataIN value generation functions. |
| 4 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 5 | * (c) Copyright 2007-2013 Datera, Inc. |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 6 | * |
| 7 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> |
| 8 | * |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 9 | ******************************************************************************/ |
| 10 | |
Bart Van Assche | 8dcf07b | 2016-11-14 15:47:14 -0800 | [diff] [blame] | 11 | #include <linux/slab.h> |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 12 | #include <scsi/iscsi_proto.h> |
Sagi Grimberg | 67f091f | 2015-01-07 14:57:31 +0200 | [diff] [blame] | 13 | #include <target/iscsi/iscsi_target_core.h> |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 14 | #include "iscsi_target_seq_pdu_list.h" |
| 15 | #include "iscsi_target_erl1.h" |
| 16 | #include "iscsi_target_util.h" |
| 17 | #include "iscsi_target.h" |
| 18 | #include "iscsi_target_datain_values.h" |
| 19 | |
| 20 | struct iscsi_datain_req *iscsit_allocate_datain_req(void) |
| 21 | { |
| 22 | struct iscsi_datain_req *dr; |
| 23 | |
| 24 | dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC); |
| 25 | if (!dr) { |
| 26 | pr_err("Unable to allocate memory for" |
| 27 | " struct iscsi_datain_req\n"); |
| 28 | return NULL; |
| 29 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 30 | INIT_LIST_HEAD(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 31 | |
| 32 | return dr; |
| 33 | } |
| 34 | |
| 35 | void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr) |
| 36 | { |
| 37 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 38 | list_add_tail(&dr->cmd_datain_node, &cmd->datain_list); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 39 | spin_unlock(&cmd->datain_lock); |
| 40 | } |
| 41 | |
| 42 | void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr) |
| 43 | { |
| 44 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 45 | list_del(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 46 | spin_unlock(&cmd->datain_lock); |
| 47 | |
| 48 | kmem_cache_free(lio_dr_cache, dr); |
| 49 | } |
| 50 | |
| 51 | void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd) |
| 52 | { |
| 53 | struct iscsi_datain_req *dr, *dr_tmp; |
| 54 | |
| 55 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 56 | list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, cmd_datain_node) { |
| 57 | list_del(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 58 | kmem_cache_free(lio_dr_cache, dr); |
| 59 | } |
| 60 | spin_unlock(&cmd->datain_lock); |
| 61 | } |
| 62 | |
| 63 | struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd) |
| 64 | { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 65 | if (list_empty(&cmd->datain_list)) { |
| 66 | pr_err("cmd->datain_list is empty for ITT:" |
| 67 | " 0x%08x\n", cmd->init_task_tag); |
| 68 | return NULL; |
| 69 | } |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 70 | |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 71 | return list_first_entry(&cmd->datain_list, struct iscsi_datain_req, |
| 72 | cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | /* |
| 76 | * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes. |
| 77 | */ |
| 78 | static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes( |
| 79 | struct iscsi_cmd *cmd, |
| 80 | struct iscsi_datain *datain) |
| 81 | { |
| 82 | u32 next_burst_len, read_data_done, read_data_left; |
| 83 | struct iscsi_conn *conn = cmd->conn; |
| 84 | struct iscsi_datain_req *dr; |
| 85 | |
| 86 | dr = iscsit_get_datain_req(cmd); |
| 87 | if (!dr) |
| 88 | return NULL; |
| 89 | |
| 90 | if (dr->recovery && dr->generate_recovery_values) { |
| 91 | if (iscsit_create_recovery_datain_values_datasequenceinorder_yes( |
| 92 | cmd, dr) < 0) |
| 93 | return NULL; |
| 94 | |
| 95 | dr->generate_recovery_values = 0; |
| 96 | } |
| 97 | |
| 98 | next_burst_len = (!dr->recovery) ? |
| 99 | cmd->next_burst_len : dr->next_burst_len; |
| 100 | read_data_done = (!dr->recovery) ? |
| 101 | cmd->read_data_done : dr->read_data_done; |
| 102 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 103 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 104 | if (!read_data_left) { |
| 105 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 106 | cmd->init_task_tag); |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) && |
| 111 | (read_data_left <= (conn->sess->sess_ops->MaxBurstLength - |
| 112 | next_burst_len))) { |
| 113 | datain->length = read_data_left; |
| 114 | |
| 115 | datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS); |
| 116 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 117 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 118 | } else { |
| 119 | if ((next_burst_len + |
| 120 | conn->conn_ops->MaxRecvDataSegmentLength) < |
| 121 | conn->sess->sess_ops->MaxBurstLength) { |
| 122 | datain->length = |
| 123 | conn->conn_ops->MaxRecvDataSegmentLength; |
| 124 | next_burst_len += datain->length; |
| 125 | } else { |
| 126 | datain->length = (conn->sess->sess_ops->MaxBurstLength - |
| 127 | next_burst_len); |
| 128 | next_burst_len = 0; |
| 129 | |
| 130 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 131 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 132 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 137 | datain->offset = read_data_done; |
| 138 | |
| 139 | if (!dr->recovery) { |
| 140 | cmd->next_burst_len = next_burst_len; |
| 141 | cmd->read_data_done += datain->length; |
| 142 | } else { |
| 143 | dr->next_burst_len = next_burst_len; |
| 144 | dr->read_data_done += datain->length; |
| 145 | } |
| 146 | |
| 147 | if (!dr->recovery) { |
| 148 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 149 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 150 | |
| 151 | return dr; |
| 152 | } |
| 153 | |
| 154 | if (!dr->runlength) { |
| 155 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 156 | dr->dr_complete = |
| 157 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 158 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 159 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 160 | } |
| 161 | } else { |
| 162 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 163 | dr->dr_complete = |
| 164 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 165 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 166 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | return dr; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes. |
| 175 | */ |
| 176 | static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes( |
| 177 | struct iscsi_cmd *cmd, |
| 178 | struct iscsi_datain *datain) |
| 179 | { |
| 180 | u32 offset, read_data_done, read_data_left, seq_send_order; |
| 181 | struct iscsi_conn *conn = cmd->conn; |
| 182 | struct iscsi_datain_req *dr; |
| 183 | struct iscsi_seq *seq; |
| 184 | |
| 185 | dr = iscsit_get_datain_req(cmd); |
| 186 | if (!dr) |
| 187 | return NULL; |
| 188 | |
| 189 | if (dr->recovery && dr->generate_recovery_values) { |
| 190 | if (iscsit_create_recovery_datain_values_datasequenceinorder_no( |
| 191 | cmd, dr) < 0) |
| 192 | return NULL; |
| 193 | |
| 194 | dr->generate_recovery_values = 0; |
| 195 | } |
| 196 | |
| 197 | read_data_done = (!dr->recovery) ? |
| 198 | cmd->read_data_done : dr->read_data_done; |
| 199 | seq_send_order = (!dr->recovery) ? |
| 200 | cmd->seq_send_order : dr->seq_send_order; |
| 201 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 202 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 203 | if (!read_data_left) { |
| 204 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 205 | cmd->init_task_tag); |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order); |
| 210 | if (!seq) |
| 211 | return NULL; |
| 212 | |
| 213 | seq->sent = 1; |
| 214 | |
| 215 | if (!dr->recovery && !seq->next_burst_len) |
| 216 | seq->first_datasn = cmd->data_sn; |
| 217 | |
| 218 | offset = (seq->offset + seq->next_burst_len); |
| 219 | |
| 220 | if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >= |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 221 | cmd->se_cmd.data_length) { |
| 222 | datain->length = (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 223 | datain->offset = offset; |
| 224 | |
| 225 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 226 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 227 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 228 | |
| 229 | seq->next_burst_len = 0; |
| 230 | seq_send_order++; |
| 231 | } else { |
| 232 | if ((seq->next_burst_len + |
| 233 | conn->conn_ops->MaxRecvDataSegmentLength) < |
| 234 | conn->sess->sess_ops->MaxBurstLength) { |
| 235 | datain->length = |
| 236 | conn->conn_ops->MaxRecvDataSegmentLength; |
| 237 | datain->offset = (seq->offset + seq->next_burst_len); |
| 238 | |
| 239 | seq->next_burst_len += datain->length; |
| 240 | } else { |
| 241 | datain->length = (conn->sess->sess_ops->MaxBurstLength - |
| 242 | seq->next_burst_len); |
| 243 | datain->offset = (seq->offset + seq->next_burst_len); |
| 244 | |
| 245 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 246 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 247 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 248 | |
| 249 | seq->next_burst_len = 0; |
| 250 | seq_send_order++; |
| 251 | } |
| 252 | } |
| 253 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 254 | if ((read_data_done + datain->length) == cmd->se_cmd.data_length) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 255 | datain->flags |= ISCSI_FLAG_DATA_STATUS; |
| 256 | |
| 257 | datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 258 | if (!dr->recovery) { |
| 259 | cmd->seq_send_order = seq_send_order; |
| 260 | cmd->read_data_done += datain->length; |
| 261 | } else { |
| 262 | dr->seq_send_order = seq_send_order; |
| 263 | dr->read_data_done += datain->length; |
| 264 | } |
| 265 | |
| 266 | if (!dr->recovery) { |
| 267 | if (datain->flags & ISCSI_FLAG_CMD_FINAL) |
| 268 | seq->last_datasn = datain->data_sn; |
| 269 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 270 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 271 | |
| 272 | return dr; |
| 273 | } |
| 274 | |
| 275 | if (!dr->runlength) { |
| 276 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 277 | dr->dr_complete = |
| 278 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 279 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 280 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 281 | } |
| 282 | } else { |
| 283 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 284 | dr->dr_complete = |
| 285 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 286 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 287 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | return dr; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No. |
| 296 | */ |
| 297 | static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no( |
| 298 | struct iscsi_cmd *cmd, |
| 299 | struct iscsi_datain *datain) |
| 300 | { |
| 301 | u32 next_burst_len, read_data_done, read_data_left; |
| 302 | struct iscsi_conn *conn = cmd->conn; |
| 303 | struct iscsi_datain_req *dr; |
| 304 | struct iscsi_pdu *pdu; |
| 305 | |
| 306 | dr = iscsit_get_datain_req(cmd); |
| 307 | if (!dr) |
| 308 | return NULL; |
| 309 | |
| 310 | if (dr->recovery && dr->generate_recovery_values) { |
| 311 | if (iscsit_create_recovery_datain_values_datasequenceinorder_yes( |
| 312 | cmd, dr) < 0) |
| 313 | return NULL; |
| 314 | |
| 315 | dr->generate_recovery_values = 0; |
| 316 | } |
| 317 | |
| 318 | next_burst_len = (!dr->recovery) ? |
| 319 | cmd->next_burst_len : dr->next_burst_len; |
| 320 | read_data_done = (!dr->recovery) ? |
| 321 | cmd->read_data_done : dr->read_data_done; |
| 322 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 323 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 324 | if (!read_data_left) { |
| 325 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 326 | cmd->init_task_tag); |
| 327 | return dr; |
| 328 | } |
| 329 | |
| 330 | pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL); |
| 331 | if (!pdu) |
| 332 | return dr; |
| 333 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 334 | if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 335 | pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS); |
| 336 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 337 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 338 | |
| 339 | next_burst_len = 0; |
| 340 | } else { |
| 341 | if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) < |
| 342 | conn->sess->sess_ops->MaxBurstLength) |
| 343 | next_burst_len += pdu->length; |
| 344 | else { |
| 345 | pdu->flags |= ISCSI_FLAG_CMD_FINAL; |
| 346 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 347 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 348 | |
| 349 | next_burst_len = 0; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 354 | if (!dr->recovery) { |
| 355 | cmd->next_burst_len = next_burst_len; |
| 356 | cmd->read_data_done += pdu->length; |
| 357 | } else { |
| 358 | dr->next_burst_len = next_burst_len; |
| 359 | dr->read_data_done += pdu->length; |
| 360 | } |
| 361 | |
| 362 | datain->flags = pdu->flags; |
| 363 | datain->length = pdu->length; |
| 364 | datain->offset = pdu->offset; |
| 365 | datain->data_sn = pdu->data_sn; |
| 366 | |
| 367 | if (!dr->recovery) { |
| 368 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 369 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 370 | |
| 371 | return dr; |
| 372 | } |
| 373 | |
| 374 | if (!dr->runlength) { |
| 375 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 376 | dr->dr_complete = |
| 377 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 378 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 379 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 380 | } |
| 381 | } else { |
| 382 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 383 | dr->dr_complete = |
| 384 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 385 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 386 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | return dr; |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No. |
| 395 | */ |
| 396 | static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no( |
| 397 | struct iscsi_cmd *cmd, |
| 398 | struct iscsi_datain *datain) |
| 399 | { |
| 400 | u32 read_data_done, read_data_left, seq_send_order; |
| 401 | struct iscsi_conn *conn = cmd->conn; |
| 402 | struct iscsi_datain_req *dr; |
| 403 | struct iscsi_pdu *pdu; |
| 404 | struct iscsi_seq *seq = NULL; |
| 405 | |
| 406 | dr = iscsit_get_datain_req(cmd); |
| 407 | if (!dr) |
| 408 | return NULL; |
| 409 | |
| 410 | if (dr->recovery && dr->generate_recovery_values) { |
| 411 | if (iscsit_create_recovery_datain_values_datasequenceinorder_no( |
| 412 | cmd, dr) < 0) |
| 413 | return NULL; |
| 414 | |
| 415 | dr->generate_recovery_values = 0; |
| 416 | } |
| 417 | |
| 418 | read_data_done = (!dr->recovery) ? |
| 419 | cmd->read_data_done : dr->read_data_done; |
| 420 | seq_send_order = (!dr->recovery) ? |
| 421 | cmd->seq_send_order : dr->seq_send_order; |
| 422 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 423 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 424 | if (!read_data_left) { |
| 425 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 426 | cmd->init_task_tag); |
| 427 | return NULL; |
| 428 | } |
| 429 | |
| 430 | seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order); |
| 431 | if (!seq) |
| 432 | return NULL; |
| 433 | |
| 434 | seq->sent = 1; |
| 435 | |
| 436 | if (!dr->recovery && !seq->next_burst_len) |
| 437 | seq->first_datasn = cmd->data_sn; |
| 438 | |
| 439 | pdu = iscsit_get_pdu_holder_for_seq(cmd, seq); |
| 440 | if (!pdu) |
| 441 | return NULL; |
| 442 | |
| 443 | if (seq->pdu_send_order == seq->pdu_count) { |
| 444 | pdu->flags |= ISCSI_FLAG_CMD_FINAL; |
| 445 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 446 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 447 | |
| 448 | seq->next_burst_len = 0; |
| 449 | seq_send_order++; |
| 450 | } else |
| 451 | seq->next_burst_len += pdu->length; |
| 452 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 453 | if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 454 | pdu->flags |= ISCSI_FLAG_DATA_STATUS; |
| 455 | |
| 456 | pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 457 | if (!dr->recovery) { |
| 458 | cmd->seq_send_order = seq_send_order; |
| 459 | cmd->read_data_done += pdu->length; |
| 460 | } else { |
| 461 | dr->seq_send_order = seq_send_order; |
| 462 | dr->read_data_done += pdu->length; |
| 463 | } |
| 464 | |
| 465 | datain->flags = pdu->flags; |
| 466 | datain->length = pdu->length; |
| 467 | datain->offset = pdu->offset; |
| 468 | datain->data_sn = pdu->data_sn; |
| 469 | |
| 470 | if (!dr->recovery) { |
| 471 | if (datain->flags & ISCSI_FLAG_CMD_FINAL) |
| 472 | seq->last_datasn = datain->data_sn; |
| 473 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 474 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 475 | |
| 476 | return dr; |
| 477 | } |
| 478 | |
| 479 | if (!dr->runlength) { |
| 480 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 481 | dr->dr_complete = |
| 482 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 483 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 484 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 485 | } |
| 486 | } else { |
| 487 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 488 | dr->dr_complete = |
| 489 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 490 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 491 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | return dr; |
| 496 | } |
| 497 | |
| 498 | struct iscsi_datain_req *iscsit_get_datain_values( |
| 499 | struct iscsi_cmd *cmd, |
| 500 | struct iscsi_datain *datain) |
| 501 | { |
| 502 | struct iscsi_conn *conn = cmd->conn; |
| 503 | |
| 504 | if (conn->sess->sess_ops->DataSequenceInOrder && |
| 505 | conn->sess->sess_ops->DataPDUInOrder) |
| 506 | return iscsit_set_datain_values_yes_and_yes(cmd, datain); |
| 507 | else if (!conn->sess->sess_ops->DataSequenceInOrder && |
| 508 | conn->sess->sess_ops->DataPDUInOrder) |
| 509 | return iscsit_set_datain_values_no_and_yes(cmd, datain); |
| 510 | else if (conn->sess->sess_ops->DataSequenceInOrder && |
| 511 | !conn->sess->sess_ops->DataPDUInOrder) |
| 512 | return iscsit_set_datain_values_yes_and_no(cmd, datain); |
| 513 | else if (!conn->sess->sess_ops->DataSequenceInOrder && |
| 514 | !conn->sess->sess_ops->DataPDUInOrder) |
| 515 | return iscsit_set_datain_values_no_and_no(cmd, datain); |
| 516 | |
| 517 | return NULL; |
| 518 | } |
Varun Prakash | d2faaef | 2016-04-20 00:00:19 +0530 | [diff] [blame] | 519 | EXPORT_SYMBOL(iscsit_get_datain_values); |