1 /*******************************************************************************
2 * This file contains main functions related to iSCSI DataSequenceInOrder=No
3 * and DataPDUInOrder=No.
5 \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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.
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 ******************************************************************************/
22 #include <linux/slab.h>
23 #include <linux/random.h>
25 #include "iscsi_target_core.h"
26 #include "iscsi_target_util.h"
27 #include "iscsi_target_seq_pdu_list.h"
29 #define OFFLOAD_BUF_SIZE 32768
31 void iscsit_dump_seq_list(struct iscsi_cmd *cmd)
34 struct iscsi_seq *seq;
36 pr_debug("Dumping Sequence List for ITT: 0x%08x:\n",
39 for (i = 0; i < cmd->seq_count; i++) {
40 seq = &cmd->seq_list[i];
41 pr_debug("i: %d, pdu_start: %d, pdu_count: %d,"
42 " offset: %d, xfer_len: %d, seq_send_order: %d,"
43 " seq_no: %d\n", i, seq->pdu_start, seq->pdu_count,
44 seq->offset, seq->xfer_len, seq->seq_send_order,
49 void iscsit_dump_pdu_list(struct iscsi_cmd *cmd)
52 struct iscsi_pdu *pdu;
54 pr_debug("Dumping PDU List for ITT: 0x%08x:\n",
57 for (i = 0; i < cmd->pdu_count; i++) {
58 pdu = &cmd->pdu_list[i];
59 pr_debug("i: %d, offset: %d, length: %d,"
60 " pdu_send_order: %d, seq_no: %d\n", i, pdu->offset,
61 pdu->length, pdu->pdu_send_order, pdu->seq_no);
65 static void iscsit_ordered_seq_lists(
66 struct iscsi_cmd *cmd,
71 for (i = 0; i < cmd->seq_count; i++) {
72 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
74 cmd->seq_list[i].seq_send_order = seq_count++;
78 static void iscsit_ordered_pdu_lists(
79 struct iscsi_cmd *cmd,
82 u32 i, pdu_send_order = 0, seq_no = 0;
84 for (i = 0; i < cmd->pdu_count; i++) {
86 if (cmd->pdu_list[i].seq_no == seq_no) {
87 cmd->pdu_list[i].pdu_send_order = pdu_send_order++;
97 * Generate count random values into array.
98 * Use 0x80000000 to mark generates valued in array[].
100 static void iscsit_create_random_array(u32 *array, u32 count)
109 for (i = 0; i < count; i++) {
111 get_random_bytes(&j, sizeof(u32));
112 j = (1 + (int) (9999 + 1) - j) % count;
113 for (k = 0; k < i + 1; k++) {
115 if ((array[k] & 0x80000000) && (array[k] == j))
121 for (i = 0; i < count; i++)
122 array[i] &= ~0x80000000;
125 static int iscsit_randomize_pdu_lists(
126 struct iscsi_cmd *cmd,
130 u32 *array, pdu_count, seq_count = 0, seq_no = 0, seq_offset = 0;
132 for (pdu_count = 0; pdu_count < cmd->pdu_count; pdu_count++) {
134 if (cmd->pdu_list[pdu_count].seq_no == seq_no) {
138 array = kzalloc(seq_count * sizeof(u32), GFP_KERNEL);
140 pr_err("Unable to allocate memory"
141 " for random array.\n");
144 iscsit_create_random_array(array, seq_count);
146 for (i = 0; i < seq_count; i++)
147 cmd->pdu_list[seq_offset+i].pdu_send_order = array[i];
151 seq_offset += seq_count;
158 array = kzalloc(seq_count * sizeof(u32), GFP_KERNEL);
160 pr_err("Unable to allocate memory for"
164 iscsit_create_random_array(array, seq_count);
166 for (i = 0; i < seq_count; i++)
167 cmd->pdu_list[seq_offset+i].pdu_send_order = array[i];
175 static int iscsit_randomize_seq_lists(
176 struct iscsi_cmd *cmd,
180 u32 *array, seq_count = cmd->seq_count;
182 if ((type == PDULIST_IMMEDIATE) || (type == PDULIST_UNSOLICITED))
184 else if (type == PDULIST_IMMEDIATE_AND_UNSOLICITED)
190 array = kzalloc(seq_count * sizeof(u32), GFP_KERNEL);
192 pr_err("Unable to allocate memory for random array.\n");
195 iscsit_create_random_array(array, seq_count);
197 for (i = 0; i < cmd->seq_count; i++) {
198 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
200 cmd->seq_list[i].seq_send_order = array[j++];
207 static void iscsit_determine_counts_for_list(
208 struct iscsi_cmd *cmd,
209 struct iscsi_build_list *bl,
213 int check_immediate = 0;
214 u32 burstlength = 0, offset = 0;
215 u32 unsolicited_data_length = 0;
216 struct iscsi_conn *conn = cmd->conn;
218 if ((bl->type == PDULIST_IMMEDIATE) ||
219 (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED))
222 if ((bl->type == PDULIST_UNSOLICITED) ||
223 (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED))
224 unsolicited_data_length = (cmd->data_length >
225 conn->sess->sess_ops->FirstBurstLength) ?
226 conn->sess->sess_ops->FirstBurstLength : cmd->data_length;
228 while (offset < cmd->data_length) {
231 if (check_immediate) {
233 offset += bl->immediate_data_length;
235 if (unsolicited_data_length)
236 unsolicited_data_length -=
237 bl->immediate_data_length;
240 if (unsolicited_data_length > 0) {
241 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength)
242 >= cmd->data_length) {
243 unsolicited_data_length -=
244 (cmd->data_length - offset);
245 offset += (cmd->data_length - offset);
248 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength)
249 >= conn->sess->sess_ops->FirstBurstLength) {
250 unsolicited_data_length -=
251 (conn->sess->sess_ops->FirstBurstLength -
253 offset += (conn->sess->sess_ops->FirstBurstLength -
260 offset += conn->conn_ops->MaxRecvDataSegmentLength;
261 unsolicited_data_length -=
262 conn->conn_ops->MaxRecvDataSegmentLength;
265 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
267 offset += (cmd->data_length - offset);
270 if ((burstlength + conn->conn_ops->MaxRecvDataSegmentLength) >=
271 conn->sess->sess_ops->MaxBurstLength) {
272 offset += (conn->sess->sess_ops->MaxBurstLength -
279 burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
280 offset += conn->conn_ops->MaxRecvDataSegmentLength;
286 * Builds PDU and/or Sequence list, called while DataSequenceInOrder=No
287 * and DataPDUInOrder=No.
289 static int iscsit_build_pdu_and_seq_list(
290 struct iscsi_cmd *cmd,
291 struct iscsi_build_list *bl)
293 int check_immediate = 0, datapduinorder, datasequenceinorder;
294 u32 burstlength = 0, offset = 0, i = 0;
295 u32 pdu_count = 0, seq_no = 0, unsolicited_data_length = 0;
296 struct iscsi_conn *conn = cmd->conn;
297 struct iscsi_pdu *pdu = cmd->pdu_list;
298 struct iscsi_seq *seq = cmd->seq_list;
300 datapduinorder = conn->sess->sess_ops->DataPDUInOrder;
301 datasequenceinorder = conn->sess->sess_ops->DataSequenceInOrder;
303 if ((bl->type == PDULIST_IMMEDIATE) ||
304 (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED))
307 if ((bl->type == PDULIST_UNSOLICITED) ||
308 (bl->type == PDULIST_IMMEDIATE_AND_UNSOLICITED))
309 unsolicited_data_length = (cmd->data_length >
310 conn->sess->sess_ops->FirstBurstLength) ?
311 conn->sess->sess_ops->FirstBurstLength : cmd->data_length;
313 while (offset < cmd->data_length) {
315 if (!datapduinorder) {
316 pdu[i].offset = offset;
317 pdu[i].seq_no = seq_no;
319 if (!datasequenceinorder && (pdu_count == 1)) {
320 seq[seq_no].pdu_start = i;
321 seq[seq_no].seq_no = seq_no;
322 seq[seq_no].offset = offset;
323 seq[seq_no].orig_offset = offset;
326 if (check_immediate) {
328 if (!datapduinorder) {
329 pdu[i].type = PDUTYPE_IMMEDIATE;
330 pdu[i++].length = bl->immediate_data_length;
332 if (!datasequenceinorder) {
333 seq[seq_no].type = SEQTYPE_IMMEDIATE;
334 seq[seq_no].pdu_count = 1;
335 seq[seq_no].xfer_len =
336 bl->immediate_data_length;
338 offset += bl->immediate_data_length;
341 if (unsolicited_data_length)
342 unsolicited_data_length -=
343 bl->immediate_data_length;
346 if (unsolicited_data_length > 0) {
348 conn->conn_ops->MaxRecvDataSegmentLength) >=
350 if (!datapduinorder) {
351 pdu[i].type = PDUTYPE_UNSOLICITED;
353 (cmd->data_length - offset);
355 if (!datasequenceinorder) {
356 seq[seq_no].type = SEQTYPE_UNSOLICITED;
357 seq[seq_no].pdu_count = pdu_count;
358 seq[seq_no].xfer_len = (burstlength +
359 (cmd->data_length - offset));
361 unsolicited_data_length -=
362 (cmd->data_length - offset);
363 offset += (cmd->data_length - offset);
367 conn->conn_ops->MaxRecvDataSegmentLength) >=
368 conn->sess->sess_ops->FirstBurstLength) {
369 if (!datapduinorder) {
370 pdu[i].type = PDUTYPE_UNSOLICITED;
372 (conn->sess->sess_ops->FirstBurstLength -
375 if (!datasequenceinorder) {
376 seq[seq_no].type = SEQTYPE_UNSOLICITED;
377 seq[seq_no].pdu_count = pdu_count;
378 seq[seq_no].xfer_len = (burstlength +
379 (conn->sess->sess_ops->FirstBurstLength -
382 unsolicited_data_length -=
383 (conn->sess->sess_ops->FirstBurstLength -
385 offset += (conn->sess->sess_ops->FirstBurstLength -
393 if (!datapduinorder) {
394 pdu[i].type = PDUTYPE_UNSOLICITED;
396 conn->conn_ops->MaxRecvDataSegmentLength;
398 burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
399 offset += conn->conn_ops->MaxRecvDataSegmentLength;
400 unsolicited_data_length -=
401 conn->conn_ops->MaxRecvDataSegmentLength;
404 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
406 if (!datapduinorder) {
407 pdu[i].type = PDUTYPE_NORMAL;
408 pdu[i].length = (cmd->data_length - offset);
410 if (!datasequenceinorder) {
411 seq[seq_no].type = SEQTYPE_NORMAL;
412 seq[seq_no].pdu_count = pdu_count;
413 seq[seq_no].xfer_len = (burstlength +
414 (cmd->data_length - offset));
416 offset += (cmd->data_length - offset);
419 if ((burstlength + conn->conn_ops->MaxRecvDataSegmentLength) >=
420 conn->sess->sess_ops->MaxBurstLength) {
421 if (!datapduinorder) {
422 pdu[i].type = PDUTYPE_NORMAL;
424 (conn->sess->sess_ops->MaxBurstLength -
427 if (!datasequenceinorder) {
428 seq[seq_no].type = SEQTYPE_NORMAL;
429 seq[seq_no].pdu_count = pdu_count;
430 seq[seq_no].xfer_len = (burstlength +
431 (conn->sess->sess_ops->MaxBurstLength -
434 offset += (conn->sess->sess_ops->MaxBurstLength -
442 if (!datapduinorder) {
443 pdu[i].type = PDUTYPE_NORMAL;
445 conn->conn_ops->MaxRecvDataSegmentLength;
447 burstlength += conn->conn_ops->MaxRecvDataSegmentLength;
448 offset += conn->conn_ops->MaxRecvDataSegmentLength;
451 if (!datasequenceinorder) {
452 if (bl->data_direction & ISCSI_PDU_WRITE) {
453 if (bl->randomize & RANDOM_R2T_OFFSETS) {
454 if (iscsit_randomize_seq_lists(cmd, bl->type)
458 iscsit_ordered_seq_lists(cmd, bl->type);
459 } else if (bl->data_direction & ISCSI_PDU_READ) {
460 if (bl->randomize & RANDOM_DATAIN_SEQ_OFFSETS) {
461 if (iscsit_randomize_seq_lists(cmd, bl->type)
465 iscsit_ordered_seq_lists(cmd, bl->type);
468 iscsit_dump_seq_list(cmd);
471 if (!datapduinorder) {
472 if (bl->data_direction & ISCSI_PDU_WRITE) {
473 if (bl->randomize & RANDOM_DATAOUT_PDU_OFFSETS) {
474 if (iscsit_randomize_pdu_lists(cmd, bl->type)
478 iscsit_ordered_pdu_lists(cmd, bl->type);
479 } else if (bl->data_direction & ISCSI_PDU_READ) {
480 if (bl->randomize & RANDOM_DATAIN_PDU_OFFSETS) {
481 if (iscsit_randomize_pdu_lists(cmd, bl->type)
485 iscsit_ordered_pdu_lists(cmd, bl->type);
488 iscsit_dump_pdu_list(cmd);
496 * Only called while DataSequenceInOrder=No or DataPDUInOrder=No.
498 int iscsit_do_build_list(
499 struct iscsi_cmd *cmd,
500 struct iscsi_build_list *bl)
502 u32 pdu_count = 0, seq_count = 1;
503 struct iscsi_conn *conn = cmd->conn;
504 struct iscsi_pdu *pdu = NULL;
505 struct iscsi_seq *seq = NULL;
507 iscsit_determine_counts_for_list(cmd, bl, &seq_count, &pdu_count);
509 if (!conn->sess->sess_ops->DataSequenceInOrder) {
510 seq = kzalloc(seq_count * sizeof(struct iscsi_seq), GFP_ATOMIC);
512 pr_err("Unable to allocate struct iscsi_seq list\n");
516 cmd->seq_count = seq_count;
519 if (!conn->sess->sess_ops->DataPDUInOrder) {
520 pdu = kzalloc(pdu_count * sizeof(struct iscsi_pdu), GFP_ATOMIC);
522 pr_err("Unable to allocate struct iscsi_pdu list.\n");
527 cmd->pdu_count = pdu_count;
530 return iscsit_build_pdu_and_seq_list(cmd, bl);
533 struct iscsi_pdu *iscsit_get_pdu_holder(
534 struct iscsi_cmd *cmd,
539 struct iscsi_pdu *pdu = NULL;
541 if (!cmd->pdu_list) {
542 pr_err("struct iscsi_cmd->pdu_list is NULL!\n");
546 pdu = &cmd->pdu_list[0];
548 for (i = 0; i < cmd->pdu_count; i++)
549 if ((pdu[i].offset == offset) && (pdu[i].length == length))
552 pr_err("Unable to locate PDU holder for ITT: 0x%08x, Offset:"
553 " %u, Length: %u\n", cmd->init_task_tag, offset, length);
557 struct iscsi_pdu *iscsit_get_pdu_holder_for_seq(
558 struct iscsi_cmd *cmd,
559 struct iscsi_seq *seq)
562 struct iscsi_conn *conn = cmd->conn;
563 struct iscsi_pdu *pdu = NULL;
565 if (!cmd->pdu_list) {
566 pr_err("struct iscsi_cmd->pdu_list is NULL!\n");
570 if (conn->sess->sess_ops->DataSequenceInOrder) {
572 pdu = &cmd->pdu_list[cmd->pdu_start];
574 for (i = 0; pdu[i].seq_no != cmd->seq_no; i++) {
576 pr_debug("pdu[i].seq_no: %d, pdu[i].pdu"
577 "_send_order: %d, pdu[i].offset: %d,"
578 " pdu[i].length: %d\n", pdu[i].seq_no,
579 pdu[i].pdu_send_order, pdu[i].offset,
582 if (pdu[i].pdu_send_order == cmd->pdu_send_order) {
583 cmd->pdu_send_order++;
588 cmd->pdu_start += cmd->pdu_send_order;
589 cmd->pdu_send_order = 0;
592 if (cmd->pdu_start < cmd->pdu_count)
595 pr_err("Command ITT: 0x%08x unable to locate"
596 " struct iscsi_pdu for cmd->pdu_send_order: %u.\n",
597 cmd->init_task_tag, cmd->pdu_send_order);
601 pr_err("struct iscsi_seq is NULL!\n");
605 pr_debug("seq->pdu_start: %d, seq->pdu_count: %d,"
606 " seq->seq_no: %d\n", seq->pdu_start, seq->pdu_count,
609 pdu = &cmd->pdu_list[seq->pdu_start];
611 if (seq->pdu_send_order == seq->pdu_count) {
612 pr_err("Command ITT: 0x%08x seq->pdu_send"
613 "_order: %u equals seq->pdu_count: %u\n",
614 cmd->init_task_tag, seq->pdu_send_order,
619 for (i = 0; i < seq->pdu_count; i++) {
620 if (pdu[i].pdu_send_order == seq->pdu_send_order) {
621 seq->pdu_send_order++;
626 pr_err("Command ITT: 0x%08x unable to locate iscsi"
627 "_pdu_t for seq->pdu_send_order: %u.\n",
628 cmd->init_task_tag, seq->pdu_send_order);
635 struct iscsi_seq *iscsit_get_seq_holder(
636 struct iscsi_cmd *cmd,
642 if (!cmd->seq_list) {
643 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
647 for (i = 0; i < cmd->seq_count; i++) {
649 pr_debug("seq_list[i].orig_offset: %d, seq_list[i]."
650 "xfer_len: %d, seq_list[i].seq_no %u\n",
651 cmd->seq_list[i].orig_offset, cmd->seq_list[i].xfer_len,
652 cmd->seq_list[i].seq_no);
654 if ((cmd->seq_list[i].orig_offset +
655 cmd->seq_list[i].xfer_len) >=
657 return &cmd->seq_list[i];
660 pr_err("Unable to locate Sequence holder for ITT: 0x%08x,"
661 " Offset: %u, Length: %u\n", cmd->init_task_tag, offset,