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linux/drivers/target/iscsi/iscsi_target_datain_values.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 
Based on 3 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  it will be useful but without any warranty without even the implied
  warranty of merchantability or fitness for a particular purpose see
  the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

520 lines
14 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
* This file contains the iSCSI Target DataIN value generation functions.
*
* (c) Copyright 2007-2013 Datera, Inc.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
******************************************************************************/
#include <linux/slab.h>
#include <scsi/iscsi_proto.h>
#include <target/iscsi/iscsi_target_core.h>
#include "iscsi_target_seq_pdu_list.h"
#include "iscsi_target_erl1.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_datain_values.h"
struct iscsi_datain_req *iscsit_allocate_datain_req(void)
{
struct iscsi_datain_req *dr;
dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC);
if (!dr) {
pr_err("Unable to allocate memory for"
" struct iscsi_datain_req\n");
return NULL;
}
INIT_LIST_HEAD(&dr->cmd_datain_node);
return dr;
}
void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
{
spin_lock(&cmd->datain_lock);
list_add_tail(&dr->cmd_datain_node, &cmd->datain_list);
spin_unlock(&cmd->datain_lock);
}
void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
{
spin_lock(&cmd->datain_lock);
list_del(&dr->cmd_datain_node);
spin_unlock(&cmd->datain_lock);
kmem_cache_free(lio_dr_cache, dr);
}
void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd)
{
struct iscsi_datain_req *dr, *dr_tmp;
spin_lock(&cmd->datain_lock);
list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, cmd_datain_node) {
list_del(&dr->cmd_datain_node);
kmem_cache_free(lio_dr_cache, dr);
}
spin_unlock(&cmd->datain_lock);
}
struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd)
{
if (list_empty(&cmd->datain_list)) {
pr_err("cmd->datain_list is empty for ITT:"
" 0x%08x\n", cmd->init_task_tag);
return NULL;
}
return list_first_entry(&cmd->datain_list, struct iscsi_datain_req,
cmd_datain_node);
}
/*
* For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes.
*/
static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes(
struct iscsi_cmd *cmd,
struct iscsi_datain *datain)
{
u32 next_burst_len, read_data_done, read_data_left;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_datain_req *dr;
dr = iscsit_get_datain_req(cmd);
if (!dr)
return NULL;
if (dr->recovery && dr->generate_recovery_values) {
if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
cmd, dr) < 0)
return NULL;
dr->generate_recovery_values = 0;
}
next_burst_len = (!dr->recovery) ?
cmd->next_burst_len : dr->next_burst_len;
read_data_done = (!dr->recovery) ?
cmd->read_data_done : dr->read_data_done;
read_data_left = (cmd->se_cmd.data_length - read_data_done);
if (!read_data_left) {
pr_err("ITT: 0x%08x read_data_left is zero!\n",
cmd->init_task_tag);
return NULL;
}
if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) &&
(read_data_left <= (conn->sess->sess_ops->MaxBurstLength -
next_burst_len))) {
datain->length = read_data_left;
datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
datain->flags |= ISCSI_FLAG_DATA_ACK;
} else {
if ((next_burst_len +
conn->conn_ops->MaxRecvDataSegmentLength) <
conn->sess->sess_ops->MaxBurstLength) {
datain->length =
conn->conn_ops->MaxRecvDataSegmentLength;
next_burst_len += datain->length;
} else {
datain->length = (conn->sess->sess_ops->MaxBurstLength -
next_burst_len);
next_burst_len = 0;
datain->flags |= ISCSI_FLAG_CMD_FINAL;
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
datain->flags |= ISCSI_FLAG_DATA_ACK;
}
}
datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
datain->offset = read_data_done;
if (!dr->recovery) {
cmd->next_burst_len = next_burst_len;
cmd->read_data_done += datain->length;
} else {
dr->next_burst_len = next_burst_len;
dr->read_data_done += datain->length;
}
if (!dr->recovery) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS)
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
return dr;
}
if (!dr->runlength) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
} else {
if ((dr->begrun + dr->runlength) == dr->data_sn) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
}
return dr;
}
/*
* For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes.
*/
static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes(
struct iscsi_cmd *cmd,
struct iscsi_datain *datain)
{
u32 offset, read_data_done, read_data_left, seq_send_order;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_datain_req *dr;
struct iscsi_seq *seq;
dr = iscsit_get_datain_req(cmd);
if (!dr)
return NULL;
if (dr->recovery && dr->generate_recovery_values) {
if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
cmd, dr) < 0)
return NULL;
dr->generate_recovery_values = 0;
}
read_data_done = (!dr->recovery) ?
cmd->read_data_done : dr->read_data_done;
seq_send_order = (!dr->recovery) ?
cmd->seq_send_order : dr->seq_send_order;
read_data_left = (cmd->se_cmd.data_length - read_data_done);
if (!read_data_left) {
pr_err("ITT: 0x%08x read_data_left is zero!\n",
cmd->init_task_tag);
return NULL;
}
seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
if (!seq)
return NULL;
seq->sent = 1;
if (!dr->recovery && !seq->next_burst_len)
seq->first_datasn = cmd->data_sn;
offset = (seq->offset + seq->next_burst_len);
if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
cmd->se_cmd.data_length) {
datain->length = (cmd->se_cmd.data_length - offset);
datain->offset = offset;
datain->flags |= ISCSI_FLAG_CMD_FINAL;
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
datain->flags |= ISCSI_FLAG_DATA_ACK;
seq->next_burst_len = 0;
seq_send_order++;
} else {
if ((seq->next_burst_len +
conn->conn_ops->MaxRecvDataSegmentLength) <
conn->sess->sess_ops->MaxBurstLength) {
datain->length =
conn->conn_ops->MaxRecvDataSegmentLength;
datain->offset = (seq->offset + seq->next_burst_len);
seq->next_burst_len += datain->length;
} else {
datain->length = (conn->sess->sess_ops->MaxBurstLength -
seq->next_burst_len);
datain->offset = (seq->offset + seq->next_burst_len);
datain->flags |= ISCSI_FLAG_CMD_FINAL;
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
datain->flags |= ISCSI_FLAG_DATA_ACK;
seq->next_burst_len = 0;
seq_send_order++;
}
}
if ((read_data_done + datain->length) == cmd->se_cmd.data_length)
datain->flags |= ISCSI_FLAG_DATA_STATUS;
datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
if (!dr->recovery) {
cmd->seq_send_order = seq_send_order;
cmd->read_data_done += datain->length;
} else {
dr->seq_send_order = seq_send_order;
dr->read_data_done += datain->length;
}
if (!dr->recovery) {
if (datain->flags & ISCSI_FLAG_CMD_FINAL)
seq->last_datasn = datain->data_sn;
if (datain->flags & ISCSI_FLAG_DATA_STATUS)
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
return dr;
}
if (!dr->runlength) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
} else {
if ((dr->begrun + dr->runlength) == dr->data_sn) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
}
return dr;
}
/*
* For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No.
*/
static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no(
struct iscsi_cmd *cmd,
struct iscsi_datain *datain)
{
u32 next_burst_len, read_data_done, read_data_left;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_datain_req *dr;
struct iscsi_pdu *pdu;
dr = iscsit_get_datain_req(cmd);
if (!dr)
return NULL;
if (dr->recovery && dr->generate_recovery_values) {
if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
cmd, dr) < 0)
return NULL;
dr->generate_recovery_values = 0;
}
next_burst_len = (!dr->recovery) ?
cmd->next_burst_len : dr->next_burst_len;
read_data_done = (!dr->recovery) ?
cmd->read_data_done : dr->read_data_done;
read_data_left = (cmd->se_cmd.data_length - read_data_done);
if (!read_data_left) {
pr_err("ITT: 0x%08x read_data_left is zero!\n",
cmd->init_task_tag);
return dr;
}
pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL);
if (!pdu)
return dr;
if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) {
pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
pdu->flags |= ISCSI_FLAG_DATA_ACK;
next_burst_len = 0;
} else {
if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) <
conn->sess->sess_ops->MaxBurstLength)
next_burst_len += pdu->length;
else {
pdu->flags |= ISCSI_FLAG_CMD_FINAL;
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
pdu->flags |= ISCSI_FLAG_DATA_ACK;
next_burst_len = 0;
}
}
pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
if (!dr->recovery) {
cmd->next_burst_len = next_burst_len;
cmd->read_data_done += pdu->length;
} else {
dr->next_burst_len = next_burst_len;
dr->read_data_done += pdu->length;
}
datain->flags = pdu->flags;
datain->length = pdu->length;
datain->offset = pdu->offset;
datain->data_sn = pdu->data_sn;
if (!dr->recovery) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS)
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
return dr;
}
if (!dr->runlength) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
} else {
if ((dr->begrun + dr->runlength) == dr->data_sn) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
}
return dr;
}
/*
* For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No.
*/
static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no(
struct iscsi_cmd *cmd,
struct iscsi_datain *datain)
{
u32 read_data_done, read_data_left, seq_send_order;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_datain_req *dr;
struct iscsi_pdu *pdu;
struct iscsi_seq *seq = NULL;
dr = iscsit_get_datain_req(cmd);
if (!dr)
return NULL;
if (dr->recovery && dr->generate_recovery_values) {
if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
cmd, dr) < 0)
return NULL;
dr->generate_recovery_values = 0;
}
read_data_done = (!dr->recovery) ?
cmd->read_data_done : dr->read_data_done;
seq_send_order = (!dr->recovery) ?
cmd->seq_send_order : dr->seq_send_order;
read_data_left = (cmd->se_cmd.data_length - read_data_done);
if (!read_data_left) {
pr_err("ITT: 0x%08x read_data_left is zero!\n",
cmd->init_task_tag);
return NULL;
}
seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
if (!seq)
return NULL;
seq->sent = 1;
if (!dr->recovery && !seq->next_burst_len)
seq->first_datasn = cmd->data_sn;
pdu = iscsit_get_pdu_holder_for_seq(cmd, seq);
if (!pdu)
return NULL;
if (seq->pdu_send_order == seq->pdu_count) {
pdu->flags |= ISCSI_FLAG_CMD_FINAL;
if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
pdu->flags |= ISCSI_FLAG_DATA_ACK;
seq->next_burst_len = 0;
seq_send_order++;
} else
seq->next_burst_len += pdu->length;
if ((read_data_done + pdu->length) == cmd->se_cmd.data_length)
pdu->flags |= ISCSI_FLAG_DATA_STATUS;
pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
if (!dr->recovery) {
cmd->seq_send_order = seq_send_order;
cmd->read_data_done += pdu->length;
} else {
dr->seq_send_order = seq_send_order;
dr->read_data_done += pdu->length;
}
datain->flags = pdu->flags;
datain->length = pdu->length;
datain->offset = pdu->offset;
datain->data_sn = pdu->data_sn;
if (!dr->recovery) {
if (datain->flags & ISCSI_FLAG_CMD_FINAL)
seq->last_datasn = datain->data_sn;
if (datain->flags & ISCSI_FLAG_DATA_STATUS)
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
return dr;
}
if (!dr->runlength) {
if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
} else {
if ((dr->begrun + dr->runlength) == dr->data_sn) {
dr->dr_complete =
(dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
DATAIN_COMPLETE_CONNECTION_RECOVERY;
}
}
return dr;
}
struct iscsi_datain_req *iscsit_get_datain_values(
struct iscsi_cmd *cmd,
struct iscsi_datain *datain)
{
struct iscsi_conn *conn = cmd->conn;
if (conn->sess->sess_ops->DataSequenceInOrder &&
conn->sess->sess_ops->DataPDUInOrder)
return iscsit_set_datain_values_yes_and_yes(cmd, datain);
else if (!conn->sess->sess_ops->DataSequenceInOrder &&
conn->sess->sess_ops->DataPDUInOrder)
return iscsit_set_datain_values_no_and_yes(cmd, datain);
else if (conn->sess->sess_ops->DataSequenceInOrder &&
!conn->sess->sess_ops->DataPDUInOrder)
return iscsit_set_datain_values_yes_and_no(cmd, datain);
else if (!conn->sess->sess_ops->DataSequenceInOrder &&
!conn->sess->sess_ops->DataPDUInOrder)
return iscsit_set_datain_values_no_and_no(cmd, datain);
return NULL;
}
EXPORT_SYMBOL(iscsit_get_datain_values);
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