Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * This file contains error recovery level zero functions used by |
| 3 | * the iSCSI Target driver. |
| 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 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | ******************************************************************************/ |
| 19 | |
| 20 | #include <scsi/iscsi_proto.h> |
| 21 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 22 | #include <target/target_core_fabric.h> |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 23 | |
| 24 | #include "iscsi_target_core.h" |
| 25 | #include "iscsi_target_seq_pdu_list.h" |
| 26 | #include "iscsi_target_tq.h" |
| 27 | #include "iscsi_target_erl0.h" |
| 28 | #include "iscsi_target_erl1.h" |
| 29 | #include "iscsi_target_erl2.h" |
| 30 | #include "iscsi_target_util.h" |
| 31 | #include "iscsi_target.h" |
| 32 | |
| 33 | /* |
| 34 | * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence() |
| 35 | * checks against to determine a PDU's Offset+Length is within the current |
| 36 | * DataOUT Sequence. Used for DataSequenceInOrder=Yes only. |
| 37 | */ |
| 38 | void iscsit_set_dataout_sequence_values( |
| 39 | struct iscsi_cmd *cmd) |
| 40 | { |
| 41 | struct iscsi_conn *conn = cmd->conn; |
| 42 | /* |
| 43 | * Still set seq_start_offset and seq_end_offset for Unsolicited |
| 44 | * DataOUT, even if DataSequenceInOrder=No. |
| 45 | */ |
| 46 | if (cmd->unsolicited_data) { |
| 47 | cmd->seq_start_offset = cmd->write_data_done; |
| 48 | cmd->seq_end_offset = (cmd->write_data_done + |
Dan Carpenter | d7ca663 | 2012-10-02 11:22:48 +0300 | [diff] [blame] | 49 | ((cmd->se_cmd.data_length > |
| 50 | conn->sess->sess_ops->FirstBurstLength) ? |
| 51 | conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length)); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 52 | return; |
| 53 | } |
| 54 | |
| 55 | if (!conn->sess->sess_ops->DataSequenceInOrder) |
| 56 | return; |
| 57 | |
| 58 | if (!cmd->seq_start_offset && !cmd->seq_end_offset) { |
| 59 | cmd->seq_start_offset = cmd->write_data_done; |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 60 | cmd->seq_end_offset = (cmd->se_cmd.data_length > |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 61 | conn->sess->sess_ops->MaxBurstLength) ? |
| 62 | (cmd->write_data_done + |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 63 | conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 64 | } else { |
| 65 | cmd->seq_start_offset = cmd->seq_end_offset; |
| 66 | cmd->seq_end_offset = ((cmd->seq_end_offset + |
| 67 | conn->sess->sess_ops->MaxBurstLength) >= |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 68 | cmd->se_cmd.data_length) ? cmd->se_cmd.data_length : |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 69 | (cmd->seq_end_offset + |
| 70 | conn->sess->sess_ops->MaxBurstLength); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | static int iscsit_dataout_within_command_recovery_check( |
| 75 | struct iscsi_cmd *cmd, |
| 76 | unsigned char *buf) |
| 77 | { |
| 78 | struct iscsi_conn *conn = cmd->conn; |
| 79 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 80 | u32 payload_length = ntoh24(hdr->dlength); |
| 81 | |
| 82 | /* |
| 83 | * We do the within-command recovery checks here as it is |
| 84 | * the first function called in iscsi_check_pre_dataout(). |
| 85 | * Basically, if we are in within-command recovery and |
| 86 | * the PDU does not contain the offset the sequence needs, |
| 87 | * dump the payload. |
| 88 | * |
| 89 | * This only applies to DataPDUInOrder=Yes, for |
| 90 | * DataPDUInOrder=No we only re-request the failed PDU |
| 91 | * and check that all PDUs in a sequence are received |
| 92 | * upon end of sequence. |
| 93 | */ |
| 94 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 95 | if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) && |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 96 | cmd->write_data_done != be32_to_cpu(hdr->offset)) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 97 | goto dump; |
| 98 | |
| 99 | cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY; |
| 100 | } else { |
| 101 | struct iscsi_seq *seq; |
| 102 | |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 103 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
| 104 | payload_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 105 | if (!seq) |
| 106 | return DATAOUT_CANNOT_RECOVER; |
| 107 | /* |
| 108 | * Set the struct iscsi_seq pointer to reuse later. |
| 109 | */ |
| 110 | cmd->seq_ptr = seq; |
| 111 | |
| 112 | if (conn->sess->sess_ops->DataPDUInOrder) { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 113 | if (seq->status == |
| 114 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && |
| 115 | (seq->offset != be32_to_cpu(hdr->offset) || |
| 116 | seq->data_sn != be32_to_cpu(hdr->datasn))) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 117 | goto dump; |
| 118 | } else { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 119 | if (seq->status == |
| 120 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && |
| 121 | seq->data_sn != be32_to_cpu(hdr->datasn)) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 122 | goto dump; |
| 123 | } |
| 124 | |
| 125 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) |
| 126 | goto dump; |
| 127 | |
| 128 | if (seq->status != DATAOUT_SEQUENCE_COMPLETE) |
| 129 | seq->status = 0; |
| 130 | } |
| 131 | |
| 132 | return DATAOUT_NORMAL; |
| 133 | |
| 134 | dump: |
| 135 | pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:" |
| 136 | " 0x%08x\n", hdr->offset, payload_length, hdr->datasn); |
| 137 | return iscsit_dump_data_payload(conn, payload_length, 1); |
| 138 | } |
| 139 | |
| 140 | static int iscsit_dataout_check_unsolicited_sequence( |
| 141 | struct iscsi_cmd *cmd, |
| 142 | unsigned char *buf) |
| 143 | { |
| 144 | u32 first_burst_len; |
| 145 | struct iscsi_conn *conn = cmd->conn; |
| 146 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 147 | u32 payload_length = ntoh24(hdr->dlength); |
| 148 | |
| 149 | |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 150 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
| 151 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 152 | pr_err("Command ITT: 0x%08x with Offset: %u," |
| 153 | " Length: %u outside of Unsolicited Sequence %u:%u while" |
| 154 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 155 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 156 | cmd->seq_end_offset); |
| 157 | return DATAOUT_CANNOT_RECOVER; |
| 158 | } |
| 159 | |
| 160 | first_burst_len = (cmd->first_burst_len + payload_length); |
| 161 | |
| 162 | if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) { |
| 163 | pr_err("Total %u bytes exceeds FirstBurstLength: %u" |
| 164 | " for this Unsolicited DataOut Burst.\n", |
| 165 | first_burst_len, conn->sess->sess_ops->FirstBurstLength); |
| 166 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
| 167 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
| 168 | return DATAOUT_CANNOT_RECOVER; |
| 169 | } |
| 170 | |
| 171 | /* |
| 172 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity |
| 173 | * checks for the current Unsolicited DataOUT Sequence. |
| 174 | */ |
| 175 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { |
| 176 | /* |
| 177 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of |
| 178 | * sequence checks are handled in |
| 179 | * iscsit_dataout_datapduinorder_no_fbit(). |
| 180 | */ |
| 181 | if (!conn->sess->sess_ops->DataPDUInOrder) |
| 182 | goto out; |
| 183 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 184 | if ((first_burst_len != cmd->se_cmd.data_length) && |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 185 | (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) { |
| 186 | pr_err("Unsolicited non-immediate data" |
| 187 | " received %u does not equal FirstBurstLength: %u, and" |
| 188 | " does not equal ExpXferLen %u.\n", first_burst_len, |
| 189 | conn->sess->sess_ops->FirstBurstLength, |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 190 | cmd->se_cmd.data_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 191 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
| 192 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
| 193 | return DATAOUT_CANNOT_RECOVER; |
| 194 | } |
| 195 | } else { |
| 196 | if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) { |
| 197 | pr_err("Command ITT: 0x%08x reached" |
| 198 | " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" |
| 199 | " error.\n", cmd->init_task_tag, |
| 200 | conn->sess->sess_ops->FirstBurstLength); |
| 201 | return DATAOUT_CANNOT_RECOVER; |
| 202 | } |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 203 | if (first_burst_len == cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 204 | pr_err("Command ITT: 0x%08x reached" |
| 205 | " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 206 | " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 207 | return DATAOUT_CANNOT_RECOVER; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | out: |
| 212 | return DATAOUT_NORMAL; |
| 213 | } |
| 214 | |
| 215 | static int iscsit_dataout_check_sequence( |
| 216 | struct iscsi_cmd *cmd, |
| 217 | unsigned char *buf) |
| 218 | { |
| 219 | u32 next_burst_len; |
| 220 | struct iscsi_conn *conn = cmd->conn; |
| 221 | struct iscsi_seq *seq = NULL; |
| 222 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 223 | u32 payload_length = ntoh24(hdr->dlength); |
| 224 | |
| 225 | /* |
| 226 | * For DataSequenceInOrder=Yes: Check that the offset and offset+length |
| 227 | * is within range as defined by iscsi_set_dataout_sequence_values(). |
| 228 | * |
| 229 | * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for |
| 230 | * offset+length tuple. |
| 231 | */ |
| 232 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 233 | /* |
| 234 | * Due to possibility of recovery DataOUT sent by the initiator |
| 235 | * fullfilling an Recovery R2T, it's best to just dump the |
| 236 | * payload here, instead of erroring out. |
| 237 | */ |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 238 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
| 239 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 240 | pr_err("Command ITT: 0x%08x with Offset: %u," |
| 241 | " Length: %u outside of Sequence %u:%u while" |
| 242 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 243 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 244 | cmd->seq_end_offset); |
| 245 | |
| 246 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
| 247 | return DATAOUT_CANNOT_RECOVER; |
| 248 | return DATAOUT_WITHIN_COMMAND_RECOVERY; |
| 249 | } |
| 250 | |
| 251 | next_burst_len = (cmd->next_burst_len + payload_length); |
| 252 | } else { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 253 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
| 254 | payload_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 255 | if (!seq) |
| 256 | return DATAOUT_CANNOT_RECOVER; |
| 257 | /* |
| 258 | * Set the struct iscsi_seq pointer to reuse later. |
| 259 | */ |
| 260 | cmd->seq_ptr = seq; |
| 261 | |
| 262 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) { |
| 263 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
| 264 | return DATAOUT_CANNOT_RECOVER; |
| 265 | return DATAOUT_WITHIN_COMMAND_RECOVERY; |
| 266 | } |
| 267 | |
| 268 | next_burst_len = (seq->next_burst_len + payload_length); |
| 269 | } |
| 270 | |
| 271 | if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) { |
| 272 | pr_err("Command ITT: 0x%08x, NextBurstLength: %u and" |
| 273 | " Length: %u exceeds MaxBurstLength: %u. protocol" |
| 274 | " error.\n", cmd->init_task_tag, |
| 275 | (next_burst_len - payload_length), |
| 276 | payload_length, conn->sess->sess_ops->MaxBurstLength); |
| 277 | return DATAOUT_CANNOT_RECOVER; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity |
| 282 | * checks for the current DataOUT Sequence. |
| 283 | */ |
| 284 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { |
| 285 | /* |
| 286 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of |
| 287 | * sequence checks are handled in |
| 288 | * iscsit_dataout_datapduinorder_no_fbit(). |
| 289 | */ |
| 290 | if (!conn->sess->sess_ops->DataPDUInOrder) |
| 291 | goto out; |
| 292 | |
| 293 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 294 | if ((next_burst_len < |
| 295 | conn->sess->sess_ops->MaxBurstLength) && |
| 296 | ((cmd->write_data_done + payload_length) < |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 297 | cmd->se_cmd.data_length)) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 298 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" |
| 299 | " before end of DataOUT sequence, protocol" |
| 300 | " error.\n", cmd->init_task_tag); |
| 301 | return DATAOUT_CANNOT_RECOVER; |
| 302 | } |
| 303 | } else { |
| 304 | if (next_burst_len < seq->xfer_len) { |
| 305 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" |
| 306 | " before end of DataOUT sequence, protocol" |
| 307 | " error.\n", cmd->init_task_tag); |
| 308 | return DATAOUT_CANNOT_RECOVER; |
| 309 | } |
| 310 | } |
| 311 | } else { |
| 312 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 313 | if (next_burst_len == |
| 314 | conn->sess->sess_ops->MaxBurstLength) { |
| 315 | pr_err("Command ITT: 0x%08x reached" |
| 316 | " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is" |
| 317 | " not set, protocol error.", cmd->init_task_tag, |
| 318 | conn->sess->sess_ops->MaxBurstLength); |
| 319 | return DATAOUT_CANNOT_RECOVER; |
| 320 | } |
| 321 | if ((cmd->write_data_done + payload_length) == |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 322 | cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 323 | pr_err("Command ITT: 0x%08x reached" |
| 324 | " last DataOUT PDU in sequence but ISCSI_FLAG_" |
| 325 | "CMD_FINAL is not set, protocol error.\n", |
| 326 | cmd->init_task_tag); |
| 327 | return DATAOUT_CANNOT_RECOVER; |
| 328 | } |
| 329 | } else { |
| 330 | if (next_burst_len == seq->xfer_len) { |
| 331 | pr_err("Command ITT: 0x%08x reached" |
| 332 | " last DataOUT PDU in sequence but ISCSI_FLAG_" |
| 333 | "CMD_FINAL is not set, protocol error.\n", |
| 334 | cmd->init_task_tag); |
| 335 | return DATAOUT_CANNOT_RECOVER; |
| 336 | } |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | out: |
| 341 | return DATAOUT_NORMAL; |
| 342 | } |
| 343 | |
| 344 | static int iscsit_dataout_check_datasn( |
| 345 | struct iscsi_cmd *cmd, |
| 346 | unsigned char *buf) |
| 347 | { |
| 348 | int dump = 0, recovery = 0; |
| 349 | u32 data_sn = 0; |
| 350 | struct iscsi_conn *conn = cmd->conn; |
| 351 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 352 | u32 payload_length = ntoh24(hdr->dlength); |
| 353 | |
| 354 | /* |
| 355 | * Considering the target has no method of re-requesting DataOUT |
| 356 | * by DataSN, if we receieve a greater DataSN than expected we |
| 357 | * assume the functions for DataPDUInOrder=[Yes,No] below will |
| 358 | * handle it. |
| 359 | * |
| 360 | * If the DataSN is less than expected, dump the payload. |
| 361 | */ |
| 362 | if (conn->sess->sess_ops->DataSequenceInOrder) |
| 363 | data_sn = cmd->data_sn; |
| 364 | else { |
| 365 | struct iscsi_seq *seq = cmd->seq_ptr; |
| 366 | data_sn = seq->data_sn; |
| 367 | } |
| 368 | |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 369 | if (be32_to_cpu(hdr->datasn) > data_sn) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 370 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
| 371 | " higher than expected 0x%08x.\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 372 | be32_to_cpu(hdr->datasn), data_sn); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 373 | recovery = 1; |
| 374 | goto recover; |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 375 | } else if (be32_to_cpu(hdr->datasn) < data_sn) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 376 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
| 377 | " lower than expected 0x%08x, discarding payload.\n", |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 378 | cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 379 | dump = 1; |
| 380 | goto dump; |
| 381 | } |
| 382 | |
| 383 | return DATAOUT_NORMAL; |
| 384 | |
| 385 | recover: |
| 386 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { |
| 387 | pr_err("Unable to perform within-command recovery" |
| 388 | " while ERL=0.\n"); |
| 389 | return DATAOUT_CANNOT_RECOVER; |
| 390 | } |
| 391 | dump: |
| 392 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
| 393 | return DATAOUT_CANNOT_RECOVER; |
| 394 | |
| 395 | return (recovery || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : |
| 396 | DATAOUT_NORMAL; |
| 397 | } |
| 398 | |
| 399 | static int iscsit_dataout_pre_datapduinorder_yes( |
| 400 | struct iscsi_cmd *cmd, |
| 401 | unsigned char *buf) |
| 402 | { |
| 403 | int dump = 0, recovery = 0; |
| 404 | struct iscsi_conn *conn = cmd->conn; |
| 405 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 406 | u32 payload_length = ntoh24(hdr->dlength); |
| 407 | |
| 408 | /* |
| 409 | * For DataSequenceInOrder=Yes: If the offset is greater than the global |
| 410 | * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has |
Masanari Iida | 2087969 | 2012-08-27 22:46:00 +0900 | [diff] [blame] | 411 | * occurred and fail the connection. |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 412 | * |
| 413 | * For DataSequenceInOrder=No: If the offset is greater than the per |
| 414 | * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol |
Masanari Iida | 2087969 | 2012-08-27 22:46:00 +0900 | [diff] [blame] | 415 | * error has occurred and fail the connection. |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 416 | */ |
| 417 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 418 | if (be32_to_cpu(hdr->offset) != cmd->write_data_done) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 419 | pr_err("Command ITT: 0x%08x, received offset" |
| 420 | " %u different than expected %u.\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 421 | be32_to_cpu(hdr->offset), cmd->write_data_done); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 422 | recovery = 1; |
| 423 | goto recover; |
| 424 | } |
| 425 | } else { |
| 426 | struct iscsi_seq *seq = cmd->seq_ptr; |
| 427 | |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 428 | if (be32_to_cpu(hdr->offset) > seq->offset) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 429 | pr_err("Command ITT: 0x%08x, received offset" |
| 430 | " %u greater than expected %u.\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 431 | be32_to_cpu(hdr->offset), seq->offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 432 | recovery = 1; |
| 433 | goto recover; |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 434 | } else if (be32_to_cpu(hdr->offset) < seq->offset) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 435 | pr_err("Command ITT: 0x%08x, received offset" |
| 436 | " %u less than expected %u, discarding payload.\n", |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 437 | cmd->init_task_tag, be32_to_cpu(hdr->offset), |
| 438 | seq->offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 439 | dump = 1; |
| 440 | goto dump; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | return DATAOUT_NORMAL; |
| 445 | |
| 446 | recover: |
| 447 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { |
| 448 | pr_err("Unable to perform within-command recovery" |
| 449 | " while ERL=0.\n"); |
| 450 | return DATAOUT_CANNOT_RECOVER; |
| 451 | } |
| 452 | dump: |
| 453 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
| 454 | return DATAOUT_CANNOT_RECOVER; |
| 455 | |
| 456 | return (recovery) ? iscsit_recover_dataout_sequence(cmd, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 457 | be32_to_cpu(hdr->offset), payload_length) : |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 458 | (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL; |
| 459 | } |
| 460 | |
| 461 | static int iscsit_dataout_pre_datapduinorder_no( |
| 462 | struct iscsi_cmd *cmd, |
| 463 | unsigned char *buf) |
| 464 | { |
| 465 | struct iscsi_pdu *pdu; |
| 466 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 467 | u32 payload_length = ntoh24(hdr->dlength); |
| 468 | |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 469 | pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset), |
| 470 | payload_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 471 | if (!pdu) |
| 472 | return DATAOUT_CANNOT_RECOVER; |
| 473 | |
| 474 | cmd->pdu_ptr = pdu; |
| 475 | |
| 476 | switch (pdu->status) { |
| 477 | case ISCSI_PDU_NOT_RECEIVED: |
| 478 | case ISCSI_PDU_CRC_FAILED: |
| 479 | case ISCSI_PDU_TIMED_OUT: |
| 480 | break; |
| 481 | case ISCSI_PDU_RECEIVED_OK: |
| 482 | pr_err("Command ITT: 0x%08x received already gotten" |
| 483 | " Offset: %u, Length: %u\n", cmd->init_task_tag, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 484 | be32_to_cpu(hdr->offset), payload_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 485 | return iscsit_dump_data_payload(cmd->conn, payload_length, 1); |
| 486 | default: |
| 487 | return DATAOUT_CANNOT_RECOVER; |
| 488 | } |
| 489 | |
| 490 | return DATAOUT_NORMAL; |
| 491 | } |
| 492 | |
| 493 | static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length) |
| 494 | { |
| 495 | struct iscsi_r2t *r2t; |
| 496 | |
| 497 | if (cmd->unsolicited_data) |
| 498 | return 0; |
| 499 | |
| 500 | r2t = iscsit_get_r2t_for_eos(cmd, offset, length); |
| 501 | if (!r2t) |
| 502 | return -1; |
| 503 | |
| 504 | spin_lock_bh(&cmd->r2t_lock); |
| 505 | r2t->seq_complete = 1; |
| 506 | cmd->outstanding_r2ts--; |
| 507 | spin_unlock_bh(&cmd->r2t_lock); |
| 508 | |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | static int iscsit_dataout_update_datapduinorder_no( |
| 513 | struct iscsi_cmd *cmd, |
| 514 | u32 data_sn, |
| 515 | int f_bit) |
| 516 | { |
| 517 | int ret = 0; |
| 518 | struct iscsi_pdu *pdu = cmd->pdu_ptr; |
| 519 | |
| 520 | pdu->data_sn = data_sn; |
| 521 | |
| 522 | switch (pdu->status) { |
| 523 | case ISCSI_PDU_NOT_RECEIVED: |
| 524 | pdu->status = ISCSI_PDU_RECEIVED_OK; |
| 525 | break; |
| 526 | case ISCSI_PDU_CRC_FAILED: |
| 527 | pdu->status = ISCSI_PDU_RECEIVED_OK; |
| 528 | break; |
| 529 | case ISCSI_PDU_TIMED_OUT: |
| 530 | pdu->status = ISCSI_PDU_RECEIVED_OK; |
| 531 | break; |
| 532 | default: |
| 533 | return DATAOUT_CANNOT_RECOVER; |
| 534 | } |
| 535 | |
| 536 | if (f_bit) { |
| 537 | ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu); |
| 538 | if (ret == DATAOUT_CANNOT_RECOVER) |
| 539 | return ret; |
| 540 | } |
| 541 | |
| 542 | return DATAOUT_NORMAL; |
| 543 | } |
| 544 | |
| 545 | static int iscsit_dataout_post_crc_passed( |
| 546 | struct iscsi_cmd *cmd, |
| 547 | unsigned char *buf) |
| 548 | { |
| 549 | int ret, send_r2t = 0; |
| 550 | struct iscsi_conn *conn = cmd->conn; |
| 551 | struct iscsi_seq *seq = NULL; |
| 552 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 553 | u32 payload_length = ntoh24(hdr->dlength); |
| 554 | |
| 555 | if (cmd->unsolicited_data) { |
| 556 | if ((cmd->first_burst_len + payload_length) == |
| 557 | conn->sess->sess_ops->FirstBurstLength) { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 558 | if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset), |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 559 | payload_length) < 0) |
| 560 | return DATAOUT_CANNOT_RECOVER; |
| 561 | send_r2t = 1; |
| 562 | } |
| 563 | |
| 564 | if (!conn->sess->sess_ops->DataPDUInOrder) { |
| 565 | ret = iscsit_dataout_update_datapduinorder_no(cmd, |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 566 | be32_to_cpu(hdr->datasn), |
| 567 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 568 | if (ret == DATAOUT_CANNOT_RECOVER) |
| 569 | return ret; |
| 570 | } |
| 571 | |
| 572 | cmd->first_burst_len += payload_length; |
| 573 | |
| 574 | if (conn->sess->sess_ops->DataSequenceInOrder) |
| 575 | cmd->data_sn++; |
| 576 | else { |
| 577 | seq = cmd->seq_ptr; |
| 578 | seq->data_sn++; |
| 579 | seq->offset += payload_length; |
| 580 | } |
| 581 | |
| 582 | if (send_r2t) { |
| 583 | if (seq) |
| 584 | seq->status = DATAOUT_SEQUENCE_COMPLETE; |
| 585 | cmd->first_burst_len = 0; |
| 586 | cmd->unsolicited_data = 0; |
| 587 | } |
| 588 | } else { |
| 589 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 590 | if ((cmd->next_burst_len + payload_length) == |
| 591 | conn->sess->sess_ops->MaxBurstLength) { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 592 | if (iscsit_dataout_update_r2t(cmd, |
| 593 | be32_to_cpu(hdr->offset), |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 594 | payload_length) < 0) |
| 595 | return DATAOUT_CANNOT_RECOVER; |
| 596 | send_r2t = 1; |
| 597 | } |
| 598 | |
| 599 | if (!conn->sess->sess_ops->DataPDUInOrder) { |
| 600 | ret = iscsit_dataout_update_datapduinorder_no( |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 601 | cmd, be32_to_cpu(hdr->datasn), |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 602 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
| 603 | if (ret == DATAOUT_CANNOT_RECOVER) |
| 604 | return ret; |
| 605 | } |
| 606 | |
| 607 | cmd->next_burst_len += payload_length; |
| 608 | cmd->data_sn++; |
| 609 | |
| 610 | if (send_r2t) |
| 611 | cmd->next_burst_len = 0; |
| 612 | } else { |
| 613 | seq = cmd->seq_ptr; |
| 614 | |
| 615 | if ((seq->next_burst_len + payload_length) == |
| 616 | seq->xfer_len) { |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 617 | if (iscsit_dataout_update_r2t(cmd, |
| 618 | be32_to_cpu(hdr->offset), |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 619 | payload_length) < 0) |
| 620 | return DATAOUT_CANNOT_RECOVER; |
| 621 | send_r2t = 1; |
| 622 | } |
| 623 | |
| 624 | if (!conn->sess->sess_ops->DataPDUInOrder) { |
| 625 | ret = iscsit_dataout_update_datapduinorder_no( |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 626 | cmd, be32_to_cpu(hdr->datasn), |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 627 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
| 628 | if (ret == DATAOUT_CANNOT_RECOVER) |
| 629 | return ret; |
| 630 | } |
| 631 | |
| 632 | seq->data_sn++; |
| 633 | seq->offset += payload_length; |
| 634 | seq->next_burst_len += payload_length; |
| 635 | |
| 636 | if (send_r2t) { |
| 637 | seq->next_burst_len = 0; |
| 638 | seq->status = DATAOUT_SEQUENCE_COMPLETE; |
| 639 | } |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder) |
| 644 | cmd->data_sn = 0; |
| 645 | |
| 646 | cmd->write_data_done += payload_length; |
| 647 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 648 | if (cmd->write_data_done == cmd->se_cmd.data_length) |
Andy Grover | c6037cc | 2012-04-03 15:51:02 -0700 | [diff] [blame] | 649 | return DATAOUT_SEND_TO_TRANSPORT; |
| 650 | else if (send_r2t) |
| 651 | return DATAOUT_SEND_R2T; |
| 652 | else |
| 653 | return DATAOUT_NORMAL; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | static int iscsit_dataout_post_crc_failed( |
| 657 | struct iscsi_cmd *cmd, |
| 658 | unsigned char *buf) |
| 659 | { |
| 660 | struct iscsi_conn *conn = cmd->conn; |
| 661 | struct iscsi_pdu *pdu; |
| 662 | struct iscsi_data *hdr = (struct iscsi_data *) buf; |
| 663 | u32 payload_length = ntoh24(hdr->dlength); |
| 664 | |
| 665 | if (conn->sess->sess_ops->DataPDUInOrder) |
| 666 | goto recover; |
| 667 | /* |
| 668 | * The rest of this function is only called when DataPDUInOrder=No. |
| 669 | */ |
| 670 | pdu = cmd->pdu_ptr; |
| 671 | |
| 672 | switch (pdu->status) { |
| 673 | case ISCSI_PDU_NOT_RECEIVED: |
| 674 | pdu->status = ISCSI_PDU_CRC_FAILED; |
| 675 | break; |
| 676 | case ISCSI_PDU_CRC_FAILED: |
| 677 | break; |
| 678 | case ISCSI_PDU_TIMED_OUT: |
| 679 | pdu->status = ISCSI_PDU_CRC_FAILED; |
| 680 | break; |
| 681 | default: |
| 682 | return DATAOUT_CANNOT_RECOVER; |
| 683 | } |
| 684 | |
| 685 | recover: |
Christoph Hellwig | 50e5c87 | 2012-09-26 08:00:40 -0400 | [diff] [blame] | 686 | return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset), |
| 687 | payload_length); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Called from iscsit_handle_data_out() before DataOUT Payload is received |
| 692 | * and CRC computed. |
| 693 | */ |
Christoph Hellwig | fceb5bc | 2012-09-26 08:00:36 -0400 | [diff] [blame] | 694 | int iscsit_check_pre_dataout( |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 695 | struct iscsi_cmd *cmd, |
| 696 | unsigned char *buf) |
| 697 | { |
| 698 | int ret; |
| 699 | struct iscsi_conn *conn = cmd->conn; |
| 700 | |
| 701 | ret = iscsit_dataout_within_command_recovery_check(cmd, buf); |
| 702 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || |
| 703 | (ret == DATAOUT_CANNOT_RECOVER)) |
| 704 | return ret; |
| 705 | |
| 706 | ret = iscsit_dataout_check_datasn(cmd, buf); |
| 707 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || |
| 708 | (ret == DATAOUT_CANNOT_RECOVER)) |
| 709 | return ret; |
| 710 | |
| 711 | if (cmd->unsolicited_data) { |
| 712 | ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf); |
| 713 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || |
| 714 | (ret == DATAOUT_CANNOT_RECOVER)) |
| 715 | return ret; |
| 716 | } else { |
| 717 | ret = iscsit_dataout_check_sequence(cmd, buf); |
| 718 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || |
| 719 | (ret == DATAOUT_CANNOT_RECOVER)) |
| 720 | return ret; |
| 721 | } |
| 722 | |
| 723 | return (conn->sess->sess_ops->DataPDUInOrder) ? |
| 724 | iscsit_dataout_pre_datapduinorder_yes(cmd, buf) : |
| 725 | iscsit_dataout_pre_datapduinorder_no(cmd, buf); |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Called from iscsit_handle_data_out() after DataOUT Payload is received |
| 730 | * and CRC computed. |
| 731 | */ |
| 732 | int iscsit_check_post_dataout( |
| 733 | struct iscsi_cmd *cmd, |
| 734 | unsigned char *buf, |
| 735 | u8 data_crc_failed) |
| 736 | { |
| 737 | struct iscsi_conn *conn = cmd->conn; |
| 738 | |
| 739 | cmd->dataout_timeout_retries = 0; |
| 740 | |
| 741 | if (!data_crc_failed) |
| 742 | return iscsit_dataout_post_crc_passed(cmd, buf); |
| 743 | else { |
| 744 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { |
| 745 | pr_err("Unable to recover from DataOUT CRC" |
| 746 | " failure while ERL=0, closing session.\n"); |
Nicholas Bellinger | ba15991 | 2013-07-03 03:48:24 -0700 | [diff] [blame] | 747 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, |
| 748 | buf); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 749 | return DATAOUT_CANNOT_RECOVER; |
| 750 | } |
| 751 | |
Nicholas Bellinger | ba15991 | 2013-07-03 03:48:24 -0700 | [diff] [blame] | 752 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 753 | return iscsit_dataout_post_crc_failed(cmd, buf); |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | static void iscsit_handle_time2retain_timeout(unsigned long data) |
| 758 | { |
| 759 | struct iscsi_session *sess = (struct iscsi_session *) data; |
Andy Grover | 60bfcf8 | 2013-10-09 11:05:58 -0700 | [diff] [blame^] | 760 | struct iscsi_portal_group *tpg = sess->tpg; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 761 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
| 762 | |
| 763 | spin_lock_bh(&se_tpg->session_lock); |
| 764 | if (sess->time2retain_timer_flags & ISCSI_TF_STOP) { |
| 765 | spin_unlock_bh(&se_tpg->session_lock); |
| 766 | return; |
| 767 | } |
| 768 | if (atomic_read(&sess->session_reinstatement)) { |
| 769 | pr_err("Exiting Time2Retain handler because" |
| 770 | " session_reinstatement=1\n"); |
| 771 | spin_unlock_bh(&se_tpg->session_lock); |
| 772 | return; |
| 773 | } |
| 774 | sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED; |
| 775 | |
| 776 | pr_err("Time2Retain timer expired for SID: %u, cleaning up" |
| 777 | " iSCSI session.\n", sess->sid); |
| 778 | { |
| 779 | struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; |
| 780 | |
| 781 | if (tiqn) { |
| 782 | spin_lock(&tiqn->sess_err_stats.lock); |
| 783 | strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, |
| 784 | (void *)sess->sess_ops->InitiatorName); |
| 785 | tiqn->sess_err_stats.last_sess_failure_type = |
| 786 | ISCSI_SESS_ERR_CXN_TIMEOUT; |
| 787 | tiqn->sess_err_stats.cxn_timeout_errors++; |
| 788 | sess->conn_timeout_errors++; |
| 789 | spin_unlock(&tiqn->sess_err_stats.lock); |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | spin_unlock_bh(&se_tpg->session_lock); |
Nicholas Bellinger | 99367f0 | 2012-02-27 01:43:32 -0800 | [diff] [blame] | 794 | target_put_session(sess->se_sess); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 795 | } |
| 796 | |
Christoph Hellwig | fceb5bc | 2012-09-26 08:00:36 -0400 | [diff] [blame] | 797 | void iscsit_start_time2retain_handler(struct iscsi_session *sess) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 798 | { |
| 799 | int tpg_active; |
| 800 | /* |
Masanari Iida | 2087969 | 2012-08-27 22:46:00 +0900 | [diff] [blame] | 801 | * Only start Time2Retain timer when the associated TPG is still in |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 802 | * an ACTIVE (eg: not disabled or shutdown) state. |
| 803 | */ |
Andy Grover | 60bfcf8 | 2013-10-09 11:05:58 -0700 | [diff] [blame^] | 804 | spin_lock(&sess->tpg->tpg_state_lock); |
| 805 | tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE); |
| 806 | spin_unlock(&sess->tpg->tpg_state_lock); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 807 | |
| 808 | if (!tpg_active) |
| 809 | return; |
| 810 | |
| 811 | if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING) |
| 812 | return; |
| 813 | |
| 814 | pr_debug("Starting Time2Retain timer for %u seconds on" |
| 815 | " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid); |
| 816 | |
| 817 | init_timer(&sess->time2retain_timer); |
| 818 | sess->time2retain_timer.expires = |
| 819 | (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ); |
| 820 | sess->time2retain_timer.data = (unsigned long)sess; |
| 821 | sess->time2retain_timer.function = iscsit_handle_time2retain_timeout; |
| 822 | sess->time2retain_timer_flags &= ~ISCSI_TF_STOP; |
| 823 | sess->time2retain_timer_flags |= ISCSI_TF_RUNNING; |
| 824 | add_timer(&sess->time2retain_timer); |
| 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Called with spin_lock_bh(&struct se_portal_group->session_lock) held |
| 829 | */ |
Christoph Hellwig | fceb5bc | 2012-09-26 08:00:36 -0400 | [diff] [blame] | 830 | int iscsit_stop_time2retain_timer(struct iscsi_session *sess) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 831 | { |
Andy Grover | 60bfcf8 | 2013-10-09 11:05:58 -0700 | [diff] [blame^] | 832 | struct iscsi_portal_group *tpg = sess->tpg; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 833 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
| 834 | |
| 835 | if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED) |
| 836 | return -1; |
| 837 | |
| 838 | if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING)) |
| 839 | return 0; |
| 840 | |
| 841 | sess->time2retain_timer_flags |= ISCSI_TF_STOP; |
Jörn Engel | 574780f | 2013-05-30 16:36:51 -0400 | [diff] [blame] | 842 | spin_unlock(&se_tpg->session_lock); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 843 | |
| 844 | del_timer_sync(&sess->time2retain_timer); |
| 845 | |
Jörn Engel | 574780f | 2013-05-30 16:36:51 -0400 | [diff] [blame] | 846 | spin_lock(&se_tpg->session_lock); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 847 | sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING; |
| 848 | pr_debug("Stopped Time2Retain Timer for SID: %u\n", |
| 849 | sess->sid); |
| 850 | return 0; |
| 851 | } |
| 852 | |
| 853 | void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn) |
| 854 | { |
| 855 | spin_lock_bh(&conn->state_lock); |
| 856 | if (atomic_read(&conn->connection_exit)) { |
| 857 | spin_unlock_bh(&conn->state_lock); |
| 858 | goto sleep; |
| 859 | } |
| 860 | |
| 861 | if (atomic_read(&conn->transport_failed)) { |
| 862 | spin_unlock_bh(&conn->state_lock); |
| 863 | goto sleep; |
| 864 | } |
| 865 | spin_unlock_bh(&conn->state_lock); |
| 866 | |
| 867 | iscsi_thread_set_force_reinstatement(conn); |
| 868 | |
| 869 | sleep: |
| 870 | wait_for_completion(&conn->conn_wait_rcfr_comp); |
| 871 | complete(&conn->conn_post_wait_comp); |
| 872 | } |
| 873 | |
| 874 | void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep) |
| 875 | { |
| 876 | spin_lock_bh(&conn->state_lock); |
| 877 | if (atomic_read(&conn->connection_exit)) { |
| 878 | spin_unlock_bh(&conn->state_lock); |
| 879 | return; |
| 880 | } |
| 881 | |
| 882 | if (atomic_read(&conn->transport_failed)) { |
| 883 | spin_unlock_bh(&conn->state_lock); |
| 884 | return; |
| 885 | } |
| 886 | |
| 887 | if (atomic_read(&conn->connection_reinstatement)) { |
| 888 | spin_unlock_bh(&conn->state_lock); |
| 889 | return; |
| 890 | } |
| 891 | |
| 892 | if (iscsi_thread_set_force_reinstatement(conn) < 0) { |
| 893 | spin_unlock_bh(&conn->state_lock); |
| 894 | return; |
| 895 | } |
| 896 | |
| 897 | atomic_set(&conn->connection_reinstatement, 1); |
| 898 | if (!sleep) { |
| 899 | spin_unlock_bh(&conn->state_lock); |
| 900 | return; |
| 901 | } |
| 902 | |
| 903 | atomic_set(&conn->sleep_on_conn_wait_comp, 1); |
| 904 | spin_unlock_bh(&conn->state_lock); |
| 905 | |
| 906 | wait_for_completion(&conn->conn_wait_comp); |
| 907 | complete(&conn->conn_post_wait_comp); |
| 908 | } |
Nicholas Bellinger | b2cb964 | 2013-07-03 03:05:37 -0700 | [diff] [blame] | 909 | EXPORT_SYMBOL(iscsit_cause_connection_reinstatement); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 910 | |
| 911 | void iscsit_fall_back_to_erl0(struct iscsi_session *sess) |
| 912 | { |
| 913 | pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:" |
| 914 | " %u\n", sess->sid); |
| 915 | |
| 916 | atomic_set(&sess->session_fall_back_to_erl0, 1); |
| 917 | } |
| 918 | |
| 919 | static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn) |
| 920 | { |
| 921 | struct iscsi_session *sess = conn->sess; |
| 922 | |
| 923 | if ((sess->sess_ops->ErrorRecoveryLevel == 2) && |
| 924 | !atomic_read(&sess->session_reinstatement) && |
| 925 | !atomic_read(&sess->session_fall_back_to_erl0)) |
| 926 | iscsit_connection_recovery_transport_reset(conn); |
| 927 | else { |
| 928 | pr_debug("Performing cleanup for failed iSCSI" |
| 929 | " Connection ID: %hu from %s\n", conn->cid, |
| 930 | sess->sess_ops->InitiatorName); |
| 931 | iscsit_close_connection(conn); |
| 932 | } |
| 933 | } |
| 934 | |
Christoph Hellwig | fceb5bc | 2012-09-26 08:00:36 -0400 | [diff] [blame] | 935 | void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 936 | { |
| 937 | spin_lock_bh(&conn->state_lock); |
| 938 | if (atomic_read(&conn->connection_exit)) { |
| 939 | spin_unlock_bh(&conn->state_lock); |
| 940 | return; |
| 941 | } |
| 942 | atomic_set(&conn->connection_exit, 1); |
| 943 | |
| 944 | if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) { |
| 945 | spin_unlock_bh(&conn->state_lock); |
| 946 | iscsit_close_connection(conn); |
| 947 | return; |
| 948 | } |
| 949 | |
| 950 | if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) { |
| 951 | spin_unlock_bh(&conn->state_lock); |
| 952 | return; |
| 953 | } |
| 954 | |
| 955 | pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); |
| 956 | conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; |
| 957 | spin_unlock_bh(&conn->state_lock); |
| 958 | |
| 959 | iscsit_handle_connection_cleanup(conn); |
| 960 | } |
| 961 | |
| 962 | /* |
| 963 | * This is the simple function that makes the magic of |
| 964 | * sync and steering happen in the follow paradoxical order: |
| 965 | * |
| 966 | * 0) Receive conn->of_marker (bytes left until next OFMarker) |
| 967 | * bytes into an offload buffer. When we pass the exact number |
| 968 | * of bytes in conn->of_marker, iscsit_dump_data_payload() and hence |
| 969 | * rx_data() will automatically receive the identical u32 marker |
| 970 | * values and store it in conn->of_marker_offset; |
| 971 | * 1) Now conn->of_marker_offset will contain the offset to the start |
| 972 | * of the next iSCSI PDU. Dump these remaining bytes into another |
| 973 | * offload buffer. |
| 974 | * 2) We are done! |
| 975 | * Next byte in the TCP stream will contain the next iSCSI PDU! |
| 976 | * Cool Huh?! |
| 977 | */ |
| 978 | int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn) |
| 979 | { |
| 980 | /* |
| 981 | * Make sure the remaining bytes to next maker is a sane value. |
| 982 | */ |
| 983 | if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) { |
| 984 | pr_err("Remaining bytes to OFMarker: %u exceeds" |
| 985 | " OFMarkInt bytes: %u.\n", conn->of_marker, |
| 986 | conn->conn_ops->OFMarkInt * 4); |
| 987 | return -1; |
| 988 | } |
| 989 | |
| 990 | pr_debug("Advancing %u bytes in TCP stream to get to the" |
| 991 | " next OFMarker.\n", conn->of_marker); |
| 992 | |
| 993 | if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0) |
| 994 | return -1; |
| 995 | |
| 996 | /* |
| 997 | * Make sure the offset marker we retrived is a valid value. |
| 998 | */ |
| 999 | if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) + |
| 1000 | conn->conn_ops->MaxRecvDataSegmentLength)) { |
| 1001 | pr_err("OfMarker offset value: %u exceeds limit.\n", |
| 1002 | conn->of_marker_offset); |
| 1003 | return -1; |
| 1004 | } |
| 1005 | |
| 1006 | pr_debug("Discarding %u bytes of TCP stream to get to the" |
| 1007 | " next iSCSI Opcode.\n", conn->of_marker_offset); |
| 1008 | |
| 1009 | if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0) |
| 1010 | return -1; |
| 1011 | |
| 1012 | return 0; |
| 1013 | } |