Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * This file contains the iSCSI Target DataIN value generation functions. |
| 3 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 4 | * (c) Copyright 2007-2013 Datera, Inc. |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 5 | * |
| 6 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.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 | |
| 19 | #include <scsi/iscsi_proto.h> |
| 20 | |
Sagi Grimberg | 67f091f | 2015-01-07 14:57:31 +0200 | [diff] [blame] | 21 | #include <target/iscsi/iscsi_target_core.h> |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 22 | #include "iscsi_target_seq_pdu_list.h" |
| 23 | #include "iscsi_target_erl1.h" |
| 24 | #include "iscsi_target_util.h" |
| 25 | #include "iscsi_target.h" |
| 26 | #include "iscsi_target_datain_values.h" |
| 27 | |
| 28 | struct iscsi_datain_req *iscsit_allocate_datain_req(void) |
| 29 | { |
| 30 | struct iscsi_datain_req *dr; |
| 31 | |
| 32 | dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC); |
| 33 | if (!dr) { |
| 34 | pr_err("Unable to allocate memory for" |
| 35 | " struct iscsi_datain_req\n"); |
| 36 | return NULL; |
| 37 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 38 | INIT_LIST_HEAD(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 39 | |
| 40 | return dr; |
| 41 | } |
| 42 | |
| 43 | void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr) |
| 44 | { |
| 45 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 46 | list_add_tail(&dr->cmd_datain_node, &cmd->datain_list); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 47 | spin_unlock(&cmd->datain_lock); |
| 48 | } |
| 49 | |
| 50 | void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr) |
| 51 | { |
| 52 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 53 | list_del(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 54 | spin_unlock(&cmd->datain_lock); |
| 55 | |
| 56 | kmem_cache_free(lio_dr_cache, dr); |
| 57 | } |
| 58 | |
| 59 | void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd) |
| 60 | { |
| 61 | struct iscsi_datain_req *dr, *dr_tmp; |
| 62 | |
| 63 | spin_lock(&cmd->datain_lock); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 64 | list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, cmd_datain_node) { |
| 65 | list_del(&dr->cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 66 | kmem_cache_free(lio_dr_cache, dr); |
| 67 | } |
| 68 | spin_unlock(&cmd->datain_lock); |
| 69 | } |
| 70 | |
| 71 | struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd) |
| 72 | { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 73 | if (list_empty(&cmd->datain_list)) { |
| 74 | pr_err("cmd->datain_list is empty for ITT:" |
| 75 | " 0x%08x\n", cmd->init_task_tag); |
| 76 | return NULL; |
| 77 | } |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 78 | |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 79 | return list_first_entry(&cmd->datain_list, struct iscsi_datain_req, |
| 80 | cmd_datain_node); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | /* |
| 84 | * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes. |
| 85 | */ |
| 86 | static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes( |
| 87 | struct iscsi_cmd *cmd, |
| 88 | struct iscsi_datain *datain) |
| 89 | { |
| 90 | u32 next_burst_len, read_data_done, read_data_left; |
| 91 | struct iscsi_conn *conn = cmd->conn; |
| 92 | struct iscsi_datain_req *dr; |
| 93 | |
| 94 | dr = iscsit_get_datain_req(cmd); |
| 95 | if (!dr) |
| 96 | return NULL; |
| 97 | |
| 98 | if (dr->recovery && dr->generate_recovery_values) { |
| 99 | if (iscsit_create_recovery_datain_values_datasequenceinorder_yes( |
| 100 | cmd, dr) < 0) |
| 101 | return NULL; |
| 102 | |
| 103 | dr->generate_recovery_values = 0; |
| 104 | } |
| 105 | |
| 106 | next_burst_len = (!dr->recovery) ? |
| 107 | cmd->next_burst_len : dr->next_burst_len; |
| 108 | read_data_done = (!dr->recovery) ? |
| 109 | cmd->read_data_done : dr->read_data_done; |
| 110 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 111 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 112 | if (!read_data_left) { |
| 113 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 114 | cmd->init_task_tag); |
| 115 | return NULL; |
| 116 | } |
| 117 | |
| 118 | if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) && |
| 119 | (read_data_left <= (conn->sess->sess_ops->MaxBurstLength - |
| 120 | next_burst_len))) { |
| 121 | datain->length = read_data_left; |
| 122 | |
| 123 | datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS); |
| 124 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 125 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 126 | } else { |
| 127 | if ((next_burst_len + |
| 128 | conn->conn_ops->MaxRecvDataSegmentLength) < |
| 129 | conn->sess->sess_ops->MaxBurstLength) { |
| 130 | datain->length = |
| 131 | conn->conn_ops->MaxRecvDataSegmentLength; |
| 132 | next_burst_len += datain->length; |
| 133 | } else { |
| 134 | datain->length = (conn->sess->sess_ops->MaxBurstLength - |
| 135 | next_burst_len); |
| 136 | next_burst_len = 0; |
| 137 | |
| 138 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 139 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 140 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 145 | datain->offset = read_data_done; |
| 146 | |
| 147 | if (!dr->recovery) { |
| 148 | cmd->next_burst_len = next_burst_len; |
| 149 | cmd->read_data_done += datain->length; |
| 150 | } else { |
| 151 | dr->next_burst_len = next_burst_len; |
| 152 | dr->read_data_done += datain->length; |
| 153 | } |
| 154 | |
| 155 | if (!dr->recovery) { |
| 156 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 157 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 158 | |
| 159 | return dr; |
| 160 | } |
| 161 | |
| 162 | if (!dr->runlength) { |
| 163 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 164 | dr->dr_complete = |
| 165 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 166 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 167 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 168 | } |
| 169 | } else { |
| 170 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 171 | dr->dr_complete = |
| 172 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 173 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 174 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | return dr; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes. |
| 183 | */ |
| 184 | static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes( |
| 185 | struct iscsi_cmd *cmd, |
| 186 | struct iscsi_datain *datain) |
| 187 | { |
| 188 | u32 offset, read_data_done, read_data_left, seq_send_order; |
| 189 | struct iscsi_conn *conn = cmd->conn; |
| 190 | struct iscsi_datain_req *dr; |
| 191 | struct iscsi_seq *seq; |
| 192 | |
| 193 | dr = iscsit_get_datain_req(cmd); |
| 194 | if (!dr) |
| 195 | return NULL; |
| 196 | |
| 197 | if (dr->recovery && dr->generate_recovery_values) { |
| 198 | if (iscsit_create_recovery_datain_values_datasequenceinorder_no( |
| 199 | cmd, dr) < 0) |
| 200 | return NULL; |
| 201 | |
| 202 | dr->generate_recovery_values = 0; |
| 203 | } |
| 204 | |
| 205 | read_data_done = (!dr->recovery) ? |
| 206 | cmd->read_data_done : dr->read_data_done; |
| 207 | seq_send_order = (!dr->recovery) ? |
| 208 | cmd->seq_send_order : dr->seq_send_order; |
| 209 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 210 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 211 | if (!read_data_left) { |
| 212 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 213 | cmd->init_task_tag); |
| 214 | return NULL; |
| 215 | } |
| 216 | |
| 217 | seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order); |
| 218 | if (!seq) |
| 219 | return NULL; |
| 220 | |
| 221 | seq->sent = 1; |
| 222 | |
| 223 | if (!dr->recovery && !seq->next_burst_len) |
| 224 | seq->first_datasn = cmd->data_sn; |
| 225 | |
| 226 | offset = (seq->offset + seq->next_burst_len); |
| 227 | |
| 228 | if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >= |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 229 | cmd->se_cmd.data_length) { |
| 230 | datain->length = (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 231 | datain->offset = offset; |
| 232 | |
| 233 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 234 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 235 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 236 | |
| 237 | seq->next_burst_len = 0; |
| 238 | seq_send_order++; |
| 239 | } else { |
| 240 | if ((seq->next_burst_len + |
| 241 | conn->conn_ops->MaxRecvDataSegmentLength) < |
| 242 | conn->sess->sess_ops->MaxBurstLength) { |
| 243 | datain->length = |
| 244 | conn->conn_ops->MaxRecvDataSegmentLength; |
| 245 | datain->offset = (seq->offset + seq->next_burst_len); |
| 246 | |
| 247 | seq->next_burst_len += datain->length; |
| 248 | } else { |
| 249 | datain->length = (conn->sess->sess_ops->MaxBurstLength - |
| 250 | seq->next_burst_len); |
| 251 | datain->offset = (seq->offset + seq->next_burst_len); |
| 252 | |
| 253 | datain->flags |= ISCSI_FLAG_CMD_FINAL; |
| 254 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 255 | datain->flags |= ISCSI_FLAG_DATA_ACK; |
| 256 | |
| 257 | seq->next_burst_len = 0; |
| 258 | seq_send_order++; |
| 259 | } |
| 260 | } |
| 261 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 262 | if ((read_data_done + datain->length) == cmd->se_cmd.data_length) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 263 | datain->flags |= ISCSI_FLAG_DATA_STATUS; |
| 264 | |
| 265 | datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 266 | if (!dr->recovery) { |
| 267 | cmd->seq_send_order = seq_send_order; |
| 268 | cmd->read_data_done += datain->length; |
| 269 | } else { |
| 270 | dr->seq_send_order = seq_send_order; |
| 271 | dr->read_data_done += datain->length; |
| 272 | } |
| 273 | |
| 274 | if (!dr->recovery) { |
| 275 | if (datain->flags & ISCSI_FLAG_CMD_FINAL) |
| 276 | seq->last_datasn = datain->data_sn; |
| 277 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 278 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 279 | |
| 280 | return dr; |
| 281 | } |
| 282 | |
| 283 | if (!dr->runlength) { |
| 284 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 285 | dr->dr_complete = |
| 286 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 287 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 288 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 289 | } |
| 290 | } else { |
| 291 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 292 | dr->dr_complete = |
| 293 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 294 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 295 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | return dr; |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No. |
| 304 | */ |
| 305 | static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no( |
| 306 | struct iscsi_cmd *cmd, |
| 307 | struct iscsi_datain *datain) |
| 308 | { |
| 309 | u32 next_burst_len, read_data_done, read_data_left; |
| 310 | struct iscsi_conn *conn = cmd->conn; |
| 311 | struct iscsi_datain_req *dr; |
| 312 | struct iscsi_pdu *pdu; |
| 313 | |
| 314 | dr = iscsit_get_datain_req(cmd); |
| 315 | if (!dr) |
| 316 | return NULL; |
| 317 | |
| 318 | if (dr->recovery && dr->generate_recovery_values) { |
| 319 | if (iscsit_create_recovery_datain_values_datasequenceinorder_yes( |
| 320 | cmd, dr) < 0) |
| 321 | return NULL; |
| 322 | |
| 323 | dr->generate_recovery_values = 0; |
| 324 | } |
| 325 | |
| 326 | next_burst_len = (!dr->recovery) ? |
| 327 | cmd->next_burst_len : dr->next_burst_len; |
| 328 | read_data_done = (!dr->recovery) ? |
| 329 | cmd->read_data_done : dr->read_data_done; |
| 330 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 331 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 332 | if (!read_data_left) { |
| 333 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 334 | cmd->init_task_tag); |
| 335 | return dr; |
| 336 | } |
| 337 | |
| 338 | pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL); |
| 339 | if (!pdu) |
| 340 | return dr; |
| 341 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 342 | if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 343 | pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS); |
| 344 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 345 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 346 | |
| 347 | next_burst_len = 0; |
| 348 | } else { |
| 349 | if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) < |
| 350 | conn->sess->sess_ops->MaxBurstLength) |
| 351 | next_burst_len += pdu->length; |
| 352 | else { |
| 353 | pdu->flags |= ISCSI_FLAG_CMD_FINAL; |
| 354 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 355 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 356 | |
| 357 | next_burst_len = 0; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 362 | if (!dr->recovery) { |
| 363 | cmd->next_burst_len = next_burst_len; |
| 364 | cmd->read_data_done += pdu->length; |
| 365 | } else { |
| 366 | dr->next_burst_len = next_burst_len; |
| 367 | dr->read_data_done += pdu->length; |
| 368 | } |
| 369 | |
| 370 | datain->flags = pdu->flags; |
| 371 | datain->length = pdu->length; |
| 372 | datain->offset = pdu->offset; |
| 373 | datain->data_sn = pdu->data_sn; |
| 374 | |
| 375 | if (!dr->recovery) { |
| 376 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 377 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 378 | |
| 379 | return dr; |
| 380 | } |
| 381 | |
| 382 | if (!dr->runlength) { |
| 383 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 384 | dr->dr_complete = |
| 385 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 386 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 387 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 388 | } |
| 389 | } else { |
| 390 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 391 | dr->dr_complete = |
| 392 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 393 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 394 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | return dr; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No. |
| 403 | */ |
| 404 | static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no( |
| 405 | struct iscsi_cmd *cmd, |
| 406 | struct iscsi_datain *datain) |
| 407 | { |
| 408 | u32 read_data_done, read_data_left, seq_send_order; |
| 409 | struct iscsi_conn *conn = cmd->conn; |
| 410 | struct iscsi_datain_req *dr; |
| 411 | struct iscsi_pdu *pdu; |
| 412 | struct iscsi_seq *seq = NULL; |
| 413 | |
| 414 | dr = iscsit_get_datain_req(cmd); |
| 415 | if (!dr) |
| 416 | return NULL; |
| 417 | |
| 418 | if (dr->recovery && dr->generate_recovery_values) { |
| 419 | if (iscsit_create_recovery_datain_values_datasequenceinorder_no( |
| 420 | cmd, dr) < 0) |
| 421 | return NULL; |
| 422 | |
| 423 | dr->generate_recovery_values = 0; |
| 424 | } |
| 425 | |
| 426 | read_data_done = (!dr->recovery) ? |
| 427 | cmd->read_data_done : dr->read_data_done; |
| 428 | seq_send_order = (!dr->recovery) ? |
| 429 | cmd->seq_send_order : dr->seq_send_order; |
| 430 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 431 | read_data_left = (cmd->se_cmd.data_length - read_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 432 | if (!read_data_left) { |
| 433 | pr_err("ITT: 0x%08x read_data_left is zero!\n", |
| 434 | cmd->init_task_tag); |
| 435 | return NULL; |
| 436 | } |
| 437 | |
| 438 | seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order); |
| 439 | if (!seq) |
| 440 | return NULL; |
| 441 | |
| 442 | seq->sent = 1; |
| 443 | |
| 444 | if (!dr->recovery && !seq->next_burst_len) |
| 445 | seq->first_datasn = cmd->data_sn; |
| 446 | |
| 447 | pdu = iscsit_get_pdu_holder_for_seq(cmd, seq); |
| 448 | if (!pdu) |
| 449 | return NULL; |
| 450 | |
| 451 | if (seq->pdu_send_order == seq->pdu_count) { |
| 452 | pdu->flags |= ISCSI_FLAG_CMD_FINAL; |
| 453 | if (conn->sess->sess_ops->ErrorRecoveryLevel > 0) |
| 454 | pdu->flags |= ISCSI_FLAG_DATA_ACK; |
| 455 | |
| 456 | seq->next_burst_len = 0; |
| 457 | seq_send_order++; |
| 458 | } else |
| 459 | seq->next_burst_len += pdu->length; |
| 460 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 461 | if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 462 | pdu->flags |= ISCSI_FLAG_DATA_STATUS; |
| 463 | |
| 464 | pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++; |
| 465 | if (!dr->recovery) { |
| 466 | cmd->seq_send_order = seq_send_order; |
| 467 | cmd->read_data_done += pdu->length; |
| 468 | } else { |
| 469 | dr->seq_send_order = seq_send_order; |
| 470 | dr->read_data_done += pdu->length; |
| 471 | } |
| 472 | |
| 473 | datain->flags = pdu->flags; |
| 474 | datain->length = pdu->length; |
| 475 | datain->offset = pdu->offset; |
| 476 | datain->data_sn = pdu->data_sn; |
| 477 | |
| 478 | if (!dr->recovery) { |
| 479 | if (datain->flags & ISCSI_FLAG_CMD_FINAL) |
| 480 | seq->last_datasn = datain->data_sn; |
| 481 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) |
| 482 | dr->dr_complete = DATAIN_COMPLETE_NORMAL; |
| 483 | |
| 484 | return dr; |
| 485 | } |
| 486 | |
| 487 | if (!dr->runlength) { |
| 488 | if (datain->flags & ISCSI_FLAG_DATA_STATUS) { |
| 489 | dr->dr_complete = |
| 490 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 491 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 492 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 493 | } |
| 494 | } else { |
| 495 | if ((dr->begrun + dr->runlength) == dr->data_sn) { |
| 496 | dr->dr_complete = |
| 497 | (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ? |
| 498 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY : |
| 499 | DATAIN_COMPLETE_CONNECTION_RECOVERY; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | return dr; |
| 504 | } |
| 505 | |
| 506 | struct iscsi_datain_req *iscsit_get_datain_values( |
| 507 | struct iscsi_cmd *cmd, |
| 508 | struct iscsi_datain *datain) |
| 509 | { |
| 510 | struct iscsi_conn *conn = cmd->conn; |
| 511 | |
| 512 | if (conn->sess->sess_ops->DataSequenceInOrder && |
| 513 | conn->sess->sess_ops->DataPDUInOrder) |
| 514 | return iscsit_set_datain_values_yes_and_yes(cmd, datain); |
| 515 | else if (!conn->sess->sess_ops->DataSequenceInOrder && |
| 516 | conn->sess->sess_ops->DataPDUInOrder) |
| 517 | return iscsit_set_datain_values_no_and_yes(cmd, datain); |
| 518 | else if (conn->sess->sess_ops->DataSequenceInOrder && |
| 519 | !conn->sess->sess_ops->DataPDUInOrder) |
| 520 | return iscsit_set_datain_values_yes_and_no(cmd, datain); |
| 521 | else if (!conn->sess->sess_ops->DataSequenceInOrder && |
| 522 | !conn->sess->sess_ops->DataPDUInOrder) |
| 523 | return iscsit_set_datain_values_no_and_no(cmd, datain); |
| 524 | |
| 525 | return NULL; |
| 526 | } |