Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * This file contains main functions related to iSCSI DataSequenceInOrder=No |
| 3 | * and DataPDUInOrder=No. |
| 4 | * |
| 5 | \u00a9 Copyright 2007-2011 RisingTide Systems LLC. |
| 6 | * |
| 7 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. |
| 8 | * |
| 9 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | ******************************************************************************/ |
| 21 | |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/random.h> |
| 24 | |
| 25 | #include "iscsi_target_core.h" |
| 26 | #include "iscsi_target_util.h" |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 27 | #include "iscsi_target_tpg.h" |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 28 | #include "iscsi_target_seq_pdu_list.h" |
| 29 | |
| 30 | #define OFFLOAD_BUF_SIZE 32768 |
| 31 | |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 32 | #ifdef DEBUG |
| 33 | static void iscsit_dump_seq_list(struct iscsi_cmd *cmd) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 34 | { |
| 35 | int i; |
| 36 | struct iscsi_seq *seq; |
| 37 | |
| 38 | pr_debug("Dumping Sequence List for ITT: 0x%08x:\n", |
| 39 | cmd->init_task_tag); |
| 40 | |
| 41 | for (i = 0; i < cmd->seq_count; i++) { |
| 42 | seq = &cmd->seq_list[i]; |
| 43 | pr_debug("i: %d, pdu_start: %d, pdu_count: %d," |
| 44 | " offset: %d, xfer_len: %d, seq_send_order: %d," |
| 45 | " seq_no: %d\n", i, seq->pdu_start, seq->pdu_count, |
| 46 | seq->offset, seq->xfer_len, seq->seq_send_order, |
| 47 | seq->seq_no); |
| 48 | } |
| 49 | } |
| 50 | |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 51 | static void iscsit_dump_pdu_list(struct iscsi_cmd *cmd) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 52 | { |
| 53 | int i; |
| 54 | struct iscsi_pdu *pdu; |
| 55 | |
| 56 | pr_debug("Dumping PDU List for ITT: 0x%08x:\n", |
| 57 | cmd->init_task_tag); |
| 58 | |
| 59 | for (i = 0; i < cmd->pdu_count; i++) { |
| 60 | pdu = &cmd->pdu_list[i]; |
| 61 | pr_debug("i: %d, offset: %d, length: %d," |
| 62 | " pdu_send_order: %d, seq_no: %d\n", i, pdu->offset, |
| 63 | pdu->length, pdu->pdu_send_order, pdu->seq_no); |
| 64 | } |
| 65 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 66 | #else |
| 67 | static void iscsit_dump_seq_list(struct iscsi_cmd *cmd) {} |
| 68 | static void iscsit_dump_pdu_list(struct iscsi_cmd *cmd) {} |
| 69 | #endif |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 70 | |
| 71 | static void iscsit_ordered_seq_lists( |
| 72 | struct iscsi_cmd *cmd, |
| 73 | u8 type) |
| 74 | { |
| 75 | u32 i, seq_count = 0; |
| 76 | |
| 77 | for (i = 0; i < cmd->seq_count; i++) { |
| 78 | if (cmd->seq_list[i].type != SEQTYPE_NORMAL) |
| 79 | continue; |
| 80 | cmd->seq_list[i].seq_send_order = seq_count++; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static void iscsit_ordered_pdu_lists( |
| 85 | struct iscsi_cmd *cmd, |
| 86 | u8 type) |
| 87 | { |
| 88 | u32 i, pdu_send_order = 0, seq_no = 0; |
| 89 | |
| 90 | for (i = 0; i < cmd->pdu_count; i++) { |
| 91 | redo: |
| 92 | if (cmd->pdu_list[i].seq_no == seq_no) { |
| 93 | cmd->pdu_list[i].pdu_send_order = pdu_send_order++; |
| 94 | continue; |
| 95 | } |
| 96 | seq_no++; |
| 97 | pdu_send_order = 0; |
| 98 | goto redo; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Generate count random values into array. |
| 104 | * Use 0x80000000 to mark generates valued in array[]. |
| 105 | */ |
| 106 | static void iscsit_create_random_array(u32 *array, u32 count) |
| 107 | { |
| 108 | int i, j, k; |
| 109 | |
| 110 | if (count == 1) { |
| 111 | array[0] = 0; |
| 112 | return; |
| 113 | } |
| 114 | |
| 115 | for (i = 0; i < count; i++) { |
| 116 | redo: |
| 117 | get_random_bytes(&j, sizeof(u32)); |
| 118 | j = (1 + (int) (9999 + 1) - j) % count; |
| 119 | for (k = 0; k < i + 1; k++) { |
| 120 | j |= 0x80000000; |
| 121 | if ((array[k] & 0x80000000) && (array[k] == j)) |
| 122 | goto redo; |
| 123 | } |
| 124 | array[i] = j; |
| 125 | } |
| 126 | |
| 127 | for (i = 0; i < count; i++) |
| 128 | array[i] &= ~0x80000000; |
| 129 | } |
| 130 | |
| 131 | static int iscsit_randomize_pdu_lists( |
| 132 | struct iscsi_cmd *cmd, |
| 133 | u8 type) |
| 134 | { |
| 135 | int i = 0; |
| 136 | u32 *array, pdu_count, seq_count = 0, seq_no = 0, seq_offset = 0; |
| 137 | |
| 138 | for (pdu_count = 0; pdu_count < cmd->pdu_count; pdu_count++) { |
| 139 | redo: |
| 140 | if (cmd->pdu_list[pdu_count].seq_no == seq_no) { |
| 141 | seq_count++; |
| 142 | continue; |
| 143 | } |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 144 | array = kcalloc(seq_count, sizeof(u32), GFP_KERNEL); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 145 | if (!array) { |
| 146 | pr_err("Unable to allocate memory" |
| 147 | " for random array.\n"); |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 148 | return -ENOMEM; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 149 | } |
| 150 | iscsit_create_random_array(array, seq_count); |
| 151 | |
| 152 | for (i = 0; i < seq_count; i++) |
| 153 | cmd->pdu_list[seq_offset+i].pdu_send_order = array[i]; |
| 154 | |
| 155 | kfree(array); |
| 156 | |
| 157 | seq_offset += seq_count; |
| 158 | seq_count = 0; |
| 159 | seq_no++; |
| 160 | goto redo; |
| 161 | } |
| 162 | |
| 163 | if (seq_count) { |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 164 | array = kcalloc(seq_count, sizeof(u32), GFP_KERNEL); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 165 | if (!array) { |
| 166 | pr_err("Unable to allocate memory for" |
| 167 | " random array.\n"); |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 168 | return -ENOMEM; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 169 | } |
| 170 | iscsit_create_random_array(array, seq_count); |
| 171 | |
| 172 | for (i = 0; i < seq_count; i++) |
| 173 | cmd->pdu_list[seq_offset+i].pdu_send_order = array[i]; |
| 174 | |
| 175 | kfree(array); |
| 176 | } |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static int iscsit_randomize_seq_lists( |
| 182 | struct iscsi_cmd *cmd, |
| 183 | u8 type) |
| 184 | { |
| 185 | int i, j = 0; |
| 186 | u32 *array, seq_count = cmd->seq_count; |
| 187 | |
| 188 | if ((type == PDULIST_IMMEDIATE) || (type == PDULIST_UNSOLICITED)) |
| 189 | seq_count--; |
| 190 | else if (type == PDULIST_IMMEDIATE_AND_UNSOLICITED) |
| 191 | seq_count -= 2; |
| 192 | |
| 193 | if (!seq_count) |
| 194 | return 0; |
| 195 | |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 196 | array = kcalloc(seq_count, sizeof(u32), GFP_KERNEL); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 197 | if (!array) { |
| 198 | pr_err("Unable to allocate memory for random array.\n"); |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 199 | return -ENOMEM; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 200 | } |
| 201 | iscsit_create_random_array(array, seq_count); |
| 202 | |
| 203 | for (i = 0; i < cmd->seq_count; i++) { |
| 204 | if (cmd->seq_list[i].type != SEQTYPE_NORMAL) |
| 205 | continue; |
| 206 | cmd->seq_list[i].seq_send_order = array[j++]; |
| 207 | } |
| 208 | |
| 209 | kfree(array); |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static void iscsit_determine_counts_for_list( |
| 214 | struct iscsi_cmd *cmd, |
| 215 | struct iscsi_build_list *bl, |
| 216 | u32 *seq_count, |
| 217 | u32 *pdu_count) |
| 218 | { |
| 219 | int check_immediate = 0; |
| 220 | u32 burstlength = 0, offset = 0; |
| 221 | u32 unsolicited_data_length = 0; |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 222 | u32 mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 223 | struct iscsi_conn *conn = cmd->conn; |
| 224 | |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 225 | if (cmd->se_cmd.data_direction == DMA_TO_DEVICE) |
| 226 | mdsl = cmd->conn->conn_ops->MaxXmitDataSegmentLength; |
| 227 | else |
| 228 | mdsl = cmd->conn->conn_ops->MaxRecvDataSegmentLength; |
| 229 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 230 | if ((bl->type == PDULIST_IMMEDIATE) || |
| 231 | (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED)) |
| 232 | check_immediate = 1; |
| 233 | |
| 234 | if ((bl->type == PDULIST_UNSOLICITED) || |
| 235 | (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED)) |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 236 | unsolicited_data_length = min(cmd->se_cmd.data_length, |
| 237 | conn->sess->sess_ops->FirstBurstLength); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 238 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 239 | while (offset < cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 240 | *pdu_count += 1; |
| 241 | |
| 242 | if (check_immediate) { |
| 243 | check_immediate = 0; |
| 244 | offset += bl->immediate_data_length; |
| 245 | *seq_count += 1; |
| 246 | if (unsolicited_data_length) |
| 247 | unsolicited_data_length -= |
| 248 | bl->immediate_data_length; |
| 249 | continue; |
| 250 | } |
| 251 | if (unsolicited_data_length > 0) { |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 252 | if ((offset + mdsl) >= cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 253 | unsolicited_data_length -= |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 254 | (cmd->se_cmd.data_length - offset); |
| 255 | offset += (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 256 | continue; |
| 257 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 258 | if ((offset + mdsl) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 259 | >= conn->sess->sess_ops->FirstBurstLength) { |
| 260 | unsolicited_data_length -= |
| 261 | (conn->sess->sess_ops->FirstBurstLength - |
| 262 | offset); |
| 263 | offset += (conn->sess->sess_ops->FirstBurstLength - |
| 264 | offset); |
| 265 | burstlength = 0; |
| 266 | *seq_count += 1; |
| 267 | continue; |
| 268 | } |
| 269 | |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 270 | offset += mdsl; |
| 271 | unsolicited_data_length -= mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 272 | continue; |
| 273 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 274 | if ((offset + mdsl) >= cmd->se_cmd.data_length) { |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 275 | offset += (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 276 | continue; |
| 277 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 278 | if ((burstlength + mdsl) >= |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 279 | conn->sess->sess_ops->MaxBurstLength) { |
| 280 | offset += (conn->sess->sess_ops->MaxBurstLength - |
| 281 | burstlength); |
| 282 | burstlength = 0; |
| 283 | *seq_count += 1; |
| 284 | continue; |
| 285 | } |
| 286 | |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 287 | burstlength += mdsl; |
| 288 | offset += mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 289 | } |
| 290 | } |
| 291 | |
| 292 | |
| 293 | /* |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 294 | * Builds PDU and/or Sequence list, called while DataSequenceInOrder=No |
| 295 | * or DataPDUInOrder=No. |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 296 | */ |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 297 | static int iscsit_do_build_pdu_and_seq_lists( |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 298 | struct iscsi_cmd *cmd, |
| 299 | struct iscsi_build_list *bl) |
| 300 | { |
| 301 | int check_immediate = 0, datapduinorder, datasequenceinorder; |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 302 | u32 burstlength = 0, offset = 0, i = 0, mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 303 | u32 pdu_count = 0, seq_no = 0, unsolicited_data_length = 0; |
| 304 | struct iscsi_conn *conn = cmd->conn; |
| 305 | struct iscsi_pdu *pdu = cmd->pdu_list; |
| 306 | struct iscsi_seq *seq = cmd->seq_list; |
| 307 | |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 308 | if (cmd->se_cmd.data_direction == DMA_TO_DEVICE) |
| 309 | mdsl = cmd->conn->conn_ops->MaxXmitDataSegmentLength; |
| 310 | else |
| 311 | mdsl = cmd->conn->conn_ops->MaxRecvDataSegmentLength; |
| 312 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 313 | datapduinorder = conn->sess->sess_ops->DataPDUInOrder; |
| 314 | datasequenceinorder = conn->sess->sess_ops->DataSequenceInOrder; |
| 315 | |
| 316 | if ((bl->type == PDULIST_IMMEDIATE) || |
| 317 | (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED)) |
| 318 | check_immediate = 1; |
| 319 | |
| 320 | if ((bl->type == PDULIST_UNSOLICITED) || |
| 321 | (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED)) |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 322 | unsolicited_data_length = min(cmd->se_cmd.data_length, |
| 323 | conn->sess->sess_ops->FirstBurstLength); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 324 | |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 325 | while (offset < cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 326 | pdu_count++; |
| 327 | if (!datapduinorder) { |
| 328 | pdu[i].offset = offset; |
| 329 | pdu[i].seq_no = seq_no; |
| 330 | } |
| 331 | if (!datasequenceinorder && (pdu_count == 1)) { |
| 332 | seq[seq_no].pdu_start = i; |
| 333 | seq[seq_no].seq_no = seq_no; |
| 334 | seq[seq_no].offset = offset; |
| 335 | seq[seq_no].orig_offset = offset; |
| 336 | } |
| 337 | |
| 338 | if (check_immediate) { |
| 339 | check_immediate = 0; |
| 340 | if (!datapduinorder) { |
| 341 | pdu[i].type = PDUTYPE_IMMEDIATE; |
| 342 | pdu[i++].length = bl->immediate_data_length; |
| 343 | } |
| 344 | if (!datasequenceinorder) { |
| 345 | seq[seq_no].type = SEQTYPE_IMMEDIATE; |
| 346 | seq[seq_no].pdu_count = 1; |
| 347 | seq[seq_no].xfer_len = |
| 348 | bl->immediate_data_length; |
| 349 | } |
| 350 | offset += bl->immediate_data_length; |
| 351 | pdu_count = 0; |
| 352 | seq_no++; |
| 353 | if (unsolicited_data_length) |
| 354 | unsolicited_data_length -= |
| 355 | bl->immediate_data_length; |
| 356 | continue; |
| 357 | } |
| 358 | if (unsolicited_data_length > 0) { |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 359 | if ((offset + mdsl) >= cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 360 | if (!datapduinorder) { |
| 361 | pdu[i].type = PDUTYPE_UNSOLICITED; |
| 362 | pdu[i].length = |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 363 | (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 364 | } |
| 365 | if (!datasequenceinorder) { |
| 366 | seq[seq_no].type = SEQTYPE_UNSOLICITED; |
| 367 | seq[seq_no].pdu_count = pdu_count; |
| 368 | seq[seq_no].xfer_len = (burstlength + |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 369 | (cmd->se_cmd.data_length - offset)); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 370 | } |
| 371 | unsolicited_data_length -= |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 372 | (cmd->se_cmd.data_length - offset); |
| 373 | offset += (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 374 | continue; |
| 375 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 376 | if ((offset + mdsl) >= |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 377 | conn->sess->sess_ops->FirstBurstLength) { |
| 378 | if (!datapduinorder) { |
| 379 | pdu[i].type = PDUTYPE_UNSOLICITED; |
| 380 | pdu[i++].length = |
| 381 | (conn->sess->sess_ops->FirstBurstLength - |
| 382 | offset); |
| 383 | } |
| 384 | if (!datasequenceinorder) { |
| 385 | seq[seq_no].type = SEQTYPE_UNSOLICITED; |
| 386 | seq[seq_no].pdu_count = pdu_count; |
| 387 | seq[seq_no].xfer_len = (burstlength + |
| 388 | (conn->sess->sess_ops->FirstBurstLength - |
| 389 | offset)); |
| 390 | } |
| 391 | unsolicited_data_length -= |
| 392 | (conn->sess->sess_ops->FirstBurstLength - |
| 393 | offset); |
| 394 | offset += (conn->sess->sess_ops->FirstBurstLength - |
| 395 | offset); |
| 396 | burstlength = 0; |
| 397 | pdu_count = 0; |
| 398 | seq_no++; |
| 399 | continue; |
| 400 | } |
| 401 | |
| 402 | if (!datapduinorder) { |
| 403 | pdu[i].type = PDUTYPE_UNSOLICITED; |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 404 | pdu[i++].length = mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 405 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 406 | burstlength += mdsl; |
| 407 | offset += mdsl; |
| 408 | unsolicited_data_length -= mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 409 | continue; |
| 410 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 411 | if ((offset + mdsl) >= cmd->se_cmd.data_length) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 412 | if (!datapduinorder) { |
| 413 | pdu[i].type = PDUTYPE_NORMAL; |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 414 | pdu[i].length = (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 415 | } |
| 416 | if (!datasequenceinorder) { |
| 417 | seq[seq_no].type = SEQTYPE_NORMAL; |
| 418 | seq[seq_no].pdu_count = pdu_count; |
| 419 | seq[seq_no].xfer_len = (burstlength + |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 420 | (cmd->se_cmd.data_length - offset)); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 421 | } |
Andy Grover | ebf1d95 | 2012-04-03 15:51:24 -0700 | [diff] [blame] | 422 | offset += (cmd->se_cmd.data_length - offset); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 423 | continue; |
| 424 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 425 | if ((burstlength + mdsl) >= |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 426 | conn->sess->sess_ops->MaxBurstLength) { |
| 427 | if (!datapduinorder) { |
| 428 | pdu[i].type = PDUTYPE_NORMAL; |
| 429 | pdu[i++].length = |
| 430 | (conn->sess->sess_ops->MaxBurstLength - |
| 431 | burstlength); |
| 432 | } |
| 433 | if (!datasequenceinorder) { |
| 434 | seq[seq_no].type = SEQTYPE_NORMAL; |
| 435 | seq[seq_no].pdu_count = pdu_count; |
| 436 | seq[seq_no].xfer_len = (burstlength + |
| 437 | (conn->sess->sess_ops->MaxBurstLength - |
| 438 | burstlength)); |
| 439 | } |
| 440 | offset += (conn->sess->sess_ops->MaxBurstLength - |
| 441 | burstlength); |
| 442 | burstlength = 0; |
| 443 | pdu_count = 0; |
| 444 | seq_no++; |
| 445 | continue; |
| 446 | } |
| 447 | |
| 448 | if (!datapduinorder) { |
| 449 | pdu[i].type = PDUTYPE_NORMAL; |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 450 | pdu[i++].length = mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 451 | } |
Nicholas Bellinger | b094a4b | 2012-09-29 22:34:10 -0700 | [diff] [blame] | 452 | burstlength += mdsl; |
| 453 | offset += mdsl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | if (!datasequenceinorder) { |
| 457 | if (bl->data_direction & ISCSI_PDU_WRITE) { |
| 458 | if (bl->randomize & RANDOM_R2T_OFFSETS) { |
| 459 | if (iscsit_randomize_seq_lists(cmd, bl->type) |
| 460 | < 0) |
| 461 | return -1; |
| 462 | } else |
| 463 | iscsit_ordered_seq_lists(cmd, bl->type); |
| 464 | } else if (bl->data_direction & ISCSI_PDU_READ) { |
| 465 | if (bl->randomize & RANDOM_DATAIN_SEQ_OFFSETS) { |
| 466 | if (iscsit_randomize_seq_lists(cmd, bl->type) |
| 467 | < 0) |
| 468 | return -1; |
| 469 | } else |
| 470 | iscsit_ordered_seq_lists(cmd, bl->type); |
| 471 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 472 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 473 | iscsit_dump_seq_list(cmd); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 474 | } |
| 475 | if (!datapduinorder) { |
| 476 | if (bl->data_direction & ISCSI_PDU_WRITE) { |
| 477 | if (bl->randomize & RANDOM_DATAOUT_PDU_OFFSETS) { |
| 478 | if (iscsit_randomize_pdu_lists(cmd, bl->type) |
| 479 | < 0) |
| 480 | return -1; |
| 481 | } else |
| 482 | iscsit_ordered_pdu_lists(cmd, bl->type); |
| 483 | } else if (bl->data_direction & ISCSI_PDU_READ) { |
| 484 | if (bl->randomize & RANDOM_DATAIN_PDU_OFFSETS) { |
| 485 | if (iscsit_randomize_pdu_lists(cmd, bl->type) |
| 486 | < 0) |
| 487 | return -1; |
| 488 | } else |
| 489 | iscsit_ordered_pdu_lists(cmd, bl->type); |
| 490 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 491 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 492 | iscsit_dump_pdu_list(cmd); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 498 | int iscsit_build_pdu_and_seq_lists( |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 499 | struct iscsi_cmd *cmd, |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 500 | u32 immediate_data_length) |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 501 | { |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 502 | struct iscsi_build_list bl; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 503 | u32 pdu_count = 0, seq_count = 1; |
| 504 | struct iscsi_conn *conn = cmd->conn; |
| 505 | struct iscsi_pdu *pdu = NULL; |
| 506 | struct iscsi_seq *seq = NULL; |
| 507 | |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 508 | struct iscsi_session *sess = conn->sess; |
| 509 | struct iscsi_node_attrib *na; |
| 510 | |
| 511 | /* |
| 512 | * Do nothing if no OOO shenanigans |
| 513 | */ |
| 514 | if (sess->sess_ops->DataSequenceInOrder && |
| 515 | sess->sess_ops->DataPDUInOrder) |
| 516 | return 0; |
| 517 | |
| 518 | if (cmd->data_direction == DMA_NONE) |
| 519 | return 0; |
| 520 | |
| 521 | na = iscsit_tpg_get_node_attrib(sess); |
| 522 | memset(&bl, 0, sizeof(struct iscsi_build_list)); |
| 523 | |
| 524 | if (cmd->data_direction == DMA_FROM_DEVICE) { |
| 525 | bl.data_direction = ISCSI_PDU_READ; |
| 526 | bl.type = PDULIST_NORMAL; |
| 527 | if (na->random_datain_pdu_offsets) |
| 528 | bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS; |
| 529 | if (na->random_datain_seq_offsets) |
| 530 | bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS; |
| 531 | } else { |
| 532 | bl.data_direction = ISCSI_PDU_WRITE; |
| 533 | bl.immediate_data_length = immediate_data_length; |
| 534 | if (na->random_r2t_offsets) |
| 535 | bl.randomize |= RANDOM_R2T_OFFSETS; |
| 536 | |
| 537 | if (!cmd->immediate_data && !cmd->unsolicited_data) |
| 538 | bl.type = PDULIST_NORMAL; |
| 539 | else if (cmd->immediate_data && !cmd->unsolicited_data) |
| 540 | bl.type = PDULIST_IMMEDIATE; |
| 541 | else if (!cmd->immediate_data && cmd->unsolicited_data) |
| 542 | bl.type = PDULIST_UNSOLICITED; |
| 543 | else if (cmd->immediate_data && cmd->unsolicited_data) |
| 544 | bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED; |
| 545 | } |
| 546 | |
| 547 | iscsit_determine_counts_for_list(cmd, &bl, &seq_count, &pdu_count); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 548 | |
| 549 | if (!conn->sess->sess_ops->DataSequenceInOrder) { |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 550 | seq = kcalloc(seq_count, sizeof(struct iscsi_seq), GFP_ATOMIC); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 551 | if (!seq) { |
| 552 | pr_err("Unable to allocate struct iscsi_seq list\n"); |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 553 | return -ENOMEM; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 554 | } |
| 555 | cmd->seq_list = seq; |
| 556 | cmd->seq_count = seq_count; |
| 557 | } |
| 558 | |
| 559 | if (!conn->sess->sess_ops->DataPDUInOrder) { |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 560 | pdu = kcalloc(pdu_count, sizeof(struct iscsi_pdu), GFP_ATOMIC); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 561 | if (!pdu) { |
| 562 | pr_err("Unable to allocate struct iscsi_pdu list.\n"); |
| 563 | kfree(seq); |
Dan Carpenter | 381e309 | 2012-04-17 09:33:59 +0300 | [diff] [blame] | 564 | return -ENOMEM; |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 565 | } |
| 566 | cmd->pdu_list = pdu; |
| 567 | cmd->pdu_count = pdu_count; |
| 568 | } |
| 569 | |
Andy Grover | 4334e49 | 2012-04-03 15:51:25 -0700 | [diff] [blame] | 570 | return iscsit_do_build_pdu_and_seq_lists(cmd, &bl); |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | struct iscsi_pdu *iscsit_get_pdu_holder( |
| 574 | struct iscsi_cmd *cmd, |
| 575 | u32 offset, |
| 576 | u32 length) |
| 577 | { |
| 578 | u32 i; |
| 579 | struct iscsi_pdu *pdu = NULL; |
| 580 | |
| 581 | if (!cmd->pdu_list) { |
| 582 | pr_err("struct iscsi_cmd->pdu_list is NULL!\n"); |
| 583 | return NULL; |
| 584 | } |
| 585 | |
| 586 | pdu = &cmd->pdu_list[0]; |
| 587 | |
| 588 | for (i = 0; i < cmd->pdu_count; i++) |
| 589 | if ((pdu[i].offset == offset) && (pdu[i].length == length)) |
| 590 | return &pdu[i]; |
| 591 | |
| 592 | pr_err("Unable to locate PDU holder for ITT: 0x%08x, Offset:" |
| 593 | " %u, Length: %u\n", cmd->init_task_tag, offset, length); |
| 594 | return NULL; |
| 595 | } |
| 596 | |
| 597 | struct iscsi_pdu *iscsit_get_pdu_holder_for_seq( |
| 598 | struct iscsi_cmd *cmd, |
| 599 | struct iscsi_seq *seq) |
| 600 | { |
| 601 | u32 i; |
| 602 | struct iscsi_conn *conn = cmd->conn; |
| 603 | struct iscsi_pdu *pdu = NULL; |
| 604 | |
| 605 | if (!cmd->pdu_list) { |
| 606 | pr_err("struct iscsi_cmd->pdu_list is NULL!\n"); |
| 607 | return NULL; |
| 608 | } |
| 609 | |
| 610 | if (conn->sess->sess_ops->DataSequenceInOrder) { |
| 611 | redo: |
| 612 | pdu = &cmd->pdu_list[cmd->pdu_start]; |
| 613 | |
| 614 | for (i = 0; pdu[i].seq_no != cmd->seq_no; i++) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 615 | pr_debug("pdu[i].seq_no: %d, pdu[i].pdu" |
| 616 | "_send_order: %d, pdu[i].offset: %d," |
| 617 | " pdu[i].length: %d\n", pdu[i].seq_no, |
| 618 | pdu[i].pdu_send_order, pdu[i].offset, |
| 619 | pdu[i].length); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 620 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 621 | if (pdu[i].pdu_send_order == cmd->pdu_send_order) { |
| 622 | cmd->pdu_send_order++; |
| 623 | return &pdu[i]; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | cmd->pdu_start += cmd->pdu_send_order; |
| 628 | cmd->pdu_send_order = 0; |
| 629 | cmd->seq_no++; |
| 630 | |
| 631 | if (cmd->pdu_start < cmd->pdu_count) |
| 632 | goto redo; |
| 633 | |
| 634 | pr_err("Command ITT: 0x%08x unable to locate" |
| 635 | " struct iscsi_pdu for cmd->pdu_send_order: %u.\n", |
| 636 | cmd->init_task_tag, cmd->pdu_send_order); |
| 637 | return NULL; |
| 638 | } else { |
| 639 | if (!seq) { |
| 640 | pr_err("struct iscsi_seq is NULL!\n"); |
| 641 | return NULL; |
| 642 | } |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 643 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 644 | pr_debug("seq->pdu_start: %d, seq->pdu_count: %d," |
| 645 | " seq->seq_no: %d\n", seq->pdu_start, seq->pdu_count, |
| 646 | seq->seq_no); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 647 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 648 | pdu = &cmd->pdu_list[seq->pdu_start]; |
| 649 | |
| 650 | if (seq->pdu_send_order == seq->pdu_count) { |
| 651 | pr_err("Command ITT: 0x%08x seq->pdu_send" |
| 652 | "_order: %u equals seq->pdu_count: %u\n", |
| 653 | cmd->init_task_tag, seq->pdu_send_order, |
| 654 | seq->pdu_count); |
| 655 | return NULL; |
| 656 | } |
| 657 | |
| 658 | for (i = 0; i < seq->pdu_count; i++) { |
| 659 | if (pdu[i].pdu_send_order == seq->pdu_send_order) { |
| 660 | seq->pdu_send_order++; |
| 661 | return &pdu[i]; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | pr_err("Command ITT: 0x%08x unable to locate iscsi" |
| 666 | "_pdu_t for seq->pdu_send_order: %u.\n", |
| 667 | cmd->init_task_tag, seq->pdu_send_order); |
| 668 | return NULL; |
| 669 | } |
| 670 | |
| 671 | return NULL; |
| 672 | } |
| 673 | |
| 674 | struct iscsi_seq *iscsit_get_seq_holder( |
| 675 | struct iscsi_cmd *cmd, |
| 676 | u32 offset, |
| 677 | u32 length) |
| 678 | { |
| 679 | u32 i; |
| 680 | |
| 681 | if (!cmd->seq_list) { |
| 682 | pr_err("struct iscsi_cmd->seq_list is NULL!\n"); |
| 683 | return NULL; |
| 684 | } |
| 685 | |
| 686 | for (i = 0; i < cmd->seq_count; i++) { |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 687 | pr_debug("seq_list[i].orig_offset: %d, seq_list[i]." |
| 688 | "xfer_len: %d, seq_list[i].seq_no %u\n", |
| 689 | cmd->seq_list[i].orig_offset, cmd->seq_list[i].xfer_len, |
| 690 | cmd->seq_list[i].seq_no); |
Andy Grover | 8b1e124 | 2012-04-03 15:51:12 -0700 | [diff] [blame] | 691 | |
Nicholas Bellinger | e48354c | 2011-07-23 06:43:04 +0000 | [diff] [blame] | 692 | if ((cmd->seq_list[i].orig_offset + |
| 693 | cmd->seq_list[i].xfer_len) >= |
| 694 | (offset + length)) |
| 695 | return &cmd->seq_list[i]; |
| 696 | } |
| 697 | |
| 698 | pr_err("Unable to locate Sequence holder for ITT: 0x%08x," |
| 699 | " Offset: %u, Length: %u\n", cmd->init_task_tag, offset, |
| 700 | length); |
| 701 | return NULL; |
| 702 | } |