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alistair23-linux/drivers/target/iscsi/iscsi_target_erl0.c
Joern Engel 5c22e22941 iscsi-target: simplify return statement 
The return statement cannot be reached without either recovery or dump
being set to 1.  Therefore the condition always evaluates to true and
recovery and dump are useless variables.

Found by Coverity.

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2014-09-17 13:19:23 -07:00

1010 lines
28 KiB
C
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/******************************************************************************
* This file contains error recovery level zero functions used by
* the iSCSI Target driver.
*
* (c) Copyright 2007-2013 Datera, Inc.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
* 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.
******************************************************************************/
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include "iscsi_target_core.h"
#include "iscsi_target_seq_pdu_list.h"
#include "iscsi_target_tq.h"
#include "iscsi_target_erl0.h"
#include "iscsi_target_erl1.h"
#include "iscsi_target_erl2.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
/*
* Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence()
* checks against to determine a PDU's Offset+Length is within the current
* DataOUT Sequence. Used for DataSequenceInOrder=Yes only.
*/
void iscsit_set_dataout_sequence_values(
struct iscsi_cmd *cmd)
{
struct iscsi_conn *conn = cmd->conn;
/*
* Still set seq_start_offset and seq_end_offset for Unsolicited
* DataOUT, even if DataSequenceInOrder=No.
*/
if (cmd->unsolicited_data) {
cmd->seq_start_offset = cmd->write_data_done;
cmd->seq_end_offset = (cmd->write_data_done +
((cmd->se_cmd.data_length >
conn->sess->sess_ops->FirstBurstLength) ?
conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length));
return;
}
if (!conn->sess->sess_ops->DataSequenceInOrder)
return;
if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
cmd->seq_start_offset = cmd->write_data_done;
cmd->seq_end_offset = (cmd->se_cmd.data_length >
conn->sess->sess_ops->MaxBurstLength) ?
(cmd->write_data_done +
conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length;
} else {
cmd->seq_start_offset = cmd->seq_end_offset;
cmd->seq_end_offset = ((cmd->seq_end_offset +
conn->sess->sess_ops->MaxBurstLength) >=
cmd->se_cmd.data_length) ? cmd->se_cmd.data_length :
(cmd->seq_end_offset +
conn->sess->sess_ops->MaxBurstLength);
}
}
static int iscsit_dataout_within_command_recovery_check(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* We do the within-command recovery checks here as it is
* the first function called in iscsi_check_pre_dataout().
* Basically, if we are in within-command recovery and
* the PDU does not contain the offset the sequence needs,
* dump the payload.
*
* This only applies to DataPDUInOrder=Yes, for
* DataPDUInOrder=No we only re-request the failed PDU
* and check that all PDUs in a sequence are received
* upon end of sequence.
*/
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
cmd->write_data_done != be32_to_cpu(hdr->offset))
goto dump;
cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
} else {
struct iscsi_seq *seq;
seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
/*
* Set the struct iscsi_seq pointer to reuse later.
*/
cmd->seq_ptr = seq;
if (conn->sess->sess_ops->DataPDUInOrder) {
if (seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
(seq->offset != be32_to_cpu(hdr->offset) ||
seq->data_sn != be32_to_cpu(hdr->datasn)))
goto dump;
} else {
if (seq->status ==
DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
seq->data_sn != be32_to_cpu(hdr->datasn))
goto dump;
}
if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
goto dump;
if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
seq->status = 0;
}
return DATAOUT_NORMAL;
dump:
pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
" 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
return iscsit_dump_data_payload(conn, payload_length, 1);
}
static int iscsit_dataout_check_unsolicited_sequence(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
u32 first_burst_len;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
pr_err("Command ITT: 0x%08x with Offset: %u,"
" Length: %u outside of Unsolicited Sequence %u:%u while"
" DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
cmd->seq_end_offset);
return DATAOUT_CANNOT_RECOVER;
}
first_burst_len = (cmd->first_burst_len + payload_length);
if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) {
pr_err("Total %u bytes exceeds FirstBurstLength: %u"
" for this Unsolicited DataOut Burst.\n",
first_burst_len, conn->sess->sess_ops->FirstBurstLength);
transport_send_check_condition_and_sense(&cmd->se_cmd,
TCM_INCORRECT_AMOUNT_OF_DATA, 0);
return DATAOUT_CANNOT_RECOVER;
}
/*
* Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
* checks for the current Unsolicited DataOUT Sequence.
*/
if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
/*
* Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
* sequence checks are handled in
* iscsit_dataout_datapduinorder_no_fbit().
*/
if (!conn->sess->sess_ops->DataPDUInOrder)
goto out;
if ((first_burst_len != cmd->se_cmd.data_length) &&
(first_burst_len != conn->sess->sess_ops->FirstBurstLength)) {
pr_err("Unsolicited non-immediate data"
" received %u does not equal FirstBurstLength: %u, and"
" does not equal ExpXferLen %u.\n", first_burst_len,
conn->sess->sess_ops->FirstBurstLength,
cmd->se_cmd.data_length);
transport_send_check_condition_and_sense(&cmd->se_cmd,
TCM_INCORRECT_AMOUNT_OF_DATA, 0);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) {
pr_err("Command ITT: 0x%08x reached"
" FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
" error.\n", cmd->init_task_tag,
conn->sess->sess_ops->FirstBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
if (first_burst_len == cmd->se_cmd.data_length) {
pr_err("Command ITT: 0x%08x reached"
" ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
" error.\n", cmd->init_task_tag, cmd->se_cmd.data_length);
return DATAOUT_CANNOT_RECOVER;
}
}
out:
return DATAOUT_NORMAL;
}
static int iscsit_dataout_check_sequence(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
u32 next_burst_len;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_seq *seq = NULL;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* For DataSequenceInOrder=Yes: Check that the offset and offset+length
* is within range as defined by iscsi_set_dataout_sequence_values().
*
* For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
* offset+length tuple.
*/
if (conn->sess->sess_ops->DataSequenceInOrder) {
/*
* Due to possibility of recovery DataOUT sent by the initiator
* fullfilling an Recovery R2T, it's best to just dump the
* payload here, instead of erroring out.
*/
if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
pr_err("Command ITT: 0x%08x with Offset: %u,"
" Length: %u outside of Sequence %u:%u while"
" DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
cmd->seq_end_offset);
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (cmd->next_burst_len + payload_length);
} else {
seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
payload_length);
if (!seq)
return DATAOUT_CANNOT_RECOVER;
/*
* Set the struct iscsi_seq pointer to reuse later.
*/
cmd->seq_ptr = seq;
if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
next_burst_len = (seq->next_burst_len + payload_length);
}
if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
" Length: %u exceeds MaxBurstLength: %u. protocol"
" error.\n", cmd->init_task_tag,
(next_burst_len - payload_length),
payload_length, conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
/*
* Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
* checks for the current DataOUT Sequence.
*/
if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
/*
* Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
* sequence checks are handled in
* iscsit_dataout_datapduinorder_no_fbit().
*/
if (!conn->sess->sess_ops->DataPDUInOrder)
goto out;
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((next_burst_len <
conn->sess->sess_ops->MaxBurstLength) &&
((cmd->write_data_done + payload_length) <
cmd->se_cmd.data_length)) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len < seq->xfer_len) {
pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
" before end of DataOUT sequence, protocol"
" error.\n", cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
} else {
if (conn->sess->sess_ops->DataSequenceInOrder) {
if (next_burst_len ==
conn->sess->sess_ops->MaxBurstLength) {
pr_err("Command ITT: 0x%08x reached"
" MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
" not set, protocol error.", cmd->init_task_tag,
conn->sess->sess_ops->MaxBurstLength);
return DATAOUT_CANNOT_RECOVER;
}
if ((cmd->write_data_done + payload_length) ==
cmd->se_cmd.data_length) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
} else {
if (next_burst_len == seq->xfer_len) {
pr_err("Command ITT: 0x%08x reached"
" last DataOUT PDU in sequence but ISCSI_FLAG_"
"CMD_FINAL is not set, protocol error.\n",
cmd->init_task_tag);
return DATAOUT_CANNOT_RECOVER;
}
}
}
out:
return DATAOUT_NORMAL;
}
static int iscsit_dataout_check_datasn(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
u32 data_sn = 0;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* Considering the target has no method of re-requesting DataOUT
* by DataSN, if we receieve a greater DataSN than expected we
* assume the functions for DataPDUInOrder=[Yes,No] below will
* handle it.
*
* If the DataSN is less than expected, dump the payload.
*/
if (conn->sess->sess_ops->DataSequenceInOrder)
data_sn = cmd->data_sn;
else {
struct iscsi_seq *seq = cmd->seq_ptr;
data_sn = seq->data_sn;
}
if (be32_to_cpu(hdr->datasn) > data_sn) {
pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
" higher than expected 0x%08x.\n", cmd->init_task_tag,
be32_to_cpu(hdr->datasn), data_sn);
goto recover;
} else if (be32_to_cpu(hdr->datasn) < data_sn) {
pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
" lower than expected 0x%08x, discarding payload.\n",
cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn);
goto dump;
}
return DATAOUT_NORMAL;
recover:
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to perform within-command recovery"
" while ERL=0.\n");
return DATAOUT_CANNOT_RECOVER;
}
dump:
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return DATAOUT_WITHIN_COMMAND_RECOVERY;
}
static int iscsit_dataout_pre_datapduinorder_yes(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
int dump = 0, recovery = 0;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
/*
* For DataSequenceInOrder=Yes: If the offset is greater than the global
* DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
* occurred and fail the connection.
*
* For DataSequenceInOrder=No: If the offset is greater than the per
* sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
* error has occurred and fail the connection.
*/
if (conn->sess->sess_ops->DataSequenceInOrder) {
if (be32_to_cpu(hdr->offset) != cmd->write_data_done) {
pr_err("Command ITT: 0x%08x, received offset"
" %u different than expected %u.\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), cmd->write_data_done);
recovery = 1;
goto recover;
}
} else {
struct iscsi_seq *seq = cmd->seq_ptr;
if (be32_to_cpu(hdr->offset) > seq->offset) {
pr_err("Command ITT: 0x%08x, received offset"
" %u greater than expected %u.\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), seq->offset);
recovery = 1;
goto recover;
} else if (be32_to_cpu(hdr->offset) < seq->offset) {
pr_err("Command ITT: 0x%08x, received offset"
" %u less than expected %u, discarding payload.\n",
cmd->init_task_tag, be32_to_cpu(hdr->offset),
seq->offset);
dump = 1;
goto dump;
}
}
return DATAOUT_NORMAL;
recover:
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to perform within-command recovery"
" while ERL=0.\n");
return DATAOUT_CANNOT_RECOVER;
}
dump:
if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
return DATAOUT_CANNOT_RECOVER;
return (recovery) ? iscsit_recover_dataout_sequence(cmd,
be32_to_cpu(hdr->offset), payload_length) :
(dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
}
static int iscsit_dataout_pre_datapduinorder_no(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_pdu *pdu;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset),
payload_length);
if (!pdu)
return DATAOUT_CANNOT_RECOVER;
cmd->pdu_ptr = pdu;
switch (pdu->status) {
case ISCSI_PDU_NOT_RECEIVED:
case ISCSI_PDU_CRC_FAILED:
case ISCSI_PDU_TIMED_OUT:
break;
case ISCSI_PDU_RECEIVED_OK:
pr_err("Command ITT: 0x%08x received already gotten"
" Offset: %u, Length: %u\n", cmd->init_task_tag,
be32_to_cpu(hdr->offset), payload_length);
return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
default:
return DATAOUT_CANNOT_RECOVER;
}
return DATAOUT_NORMAL;
}
static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
{
struct iscsi_r2t *r2t;
if (cmd->unsolicited_data)
return 0;
r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
if (!r2t)
return -1;
spin_lock_bh(&cmd->r2t_lock);
r2t->seq_complete = 1;
cmd->outstanding_r2ts--;
spin_unlock_bh(&cmd->r2t_lock);
return 0;
}
static int iscsit_dataout_update_datapduinorder_no(
struct iscsi_cmd *cmd,
u32 data_sn,
int f_bit)
{
int ret = 0;
struct iscsi_pdu *pdu = cmd->pdu_ptr;
pdu->data_sn = data_sn;
switch (pdu->status) {
case ISCSI_PDU_NOT_RECEIVED:
pdu->status = ISCSI_PDU_RECEIVED_OK;
break;
case ISCSI_PDU_CRC_FAILED:
pdu->status = ISCSI_PDU_RECEIVED_OK;
break;
case ISCSI_PDU_TIMED_OUT:
pdu->status = ISCSI_PDU_RECEIVED_OK;
break;
default:
return DATAOUT_CANNOT_RECOVER;
}
if (f_bit) {
ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
if (ret == DATAOUT_CANNOT_RECOVER)
return ret;
}
return DATAOUT_NORMAL;
}
static int iscsit_dataout_post_crc_passed(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
int ret, send_r2t = 0;
struct iscsi_conn *conn = cmd->conn;
struct iscsi_seq *seq = NULL;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if (cmd->unsolicited_data) {
if ((cmd->first_burst_len + payload_length) ==
conn->sess->sess_ops->FirstBurstLength) {
if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset),
payload_length) < 0)
return DATAOUT_CANNOT_RECOVER;
send_r2t = 1;
}
if (!conn->sess->sess_ops->DataPDUInOrder) {
ret = iscsit_dataout_update_datapduinorder_no(cmd,
be32_to_cpu(hdr->datasn),
(hdr->flags & ISCSI_FLAG_CMD_FINAL));
if (ret == DATAOUT_CANNOT_RECOVER)
return ret;
}
cmd->first_burst_len += payload_length;
if (conn->sess->sess_ops->DataSequenceInOrder)
cmd->data_sn++;
else {
seq = cmd->seq_ptr;
seq->data_sn++;
seq->offset += payload_length;
}
if (send_r2t) {
if (seq)
seq->status = DATAOUT_SEQUENCE_COMPLETE;
cmd->first_burst_len = 0;
cmd->unsolicited_data = 0;
}
} else {
if (conn->sess->sess_ops->DataSequenceInOrder) {
if ((cmd->next_burst_len + payload_length) ==
conn->sess->sess_ops->MaxBurstLength) {
if (iscsit_dataout_update_r2t(cmd,
be32_to_cpu(hdr->offset),
payload_length) < 0)
return DATAOUT_CANNOT_RECOVER;
send_r2t = 1;
}
if (!conn->sess->sess_ops->DataPDUInOrder) {
ret = iscsit_dataout_update_datapduinorder_no(
cmd, be32_to_cpu(hdr->datasn),
(hdr->flags & ISCSI_FLAG_CMD_FINAL));
if (ret == DATAOUT_CANNOT_RECOVER)
return ret;
}
cmd->next_burst_len += payload_length;
cmd->data_sn++;
if (send_r2t)
cmd->next_burst_len = 0;
} else {
seq = cmd->seq_ptr;
if ((seq->next_burst_len + payload_length) ==
seq->xfer_len) {
if (iscsit_dataout_update_r2t(cmd,
be32_to_cpu(hdr->offset),
payload_length) < 0)
return DATAOUT_CANNOT_RECOVER;
send_r2t = 1;
}
if (!conn->sess->sess_ops->DataPDUInOrder) {
ret = iscsit_dataout_update_datapduinorder_no(
cmd, be32_to_cpu(hdr->datasn),
(hdr->flags & ISCSI_FLAG_CMD_FINAL));
if (ret == DATAOUT_CANNOT_RECOVER)
return ret;
}
seq->data_sn++;
seq->offset += payload_length;
seq->next_burst_len += payload_length;
if (send_r2t) {
seq->next_burst_len = 0;
seq->status = DATAOUT_SEQUENCE_COMPLETE;
}
}
}
if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
cmd->data_sn = 0;
cmd->write_data_done += payload_length;
if (cmd->write_data_done == cmd->se_cmd.data_length)
return DATAOUT_SEND_TO_TRANSPORT;
else if (send_r2t)
return DATAOUT_SEND_R2T;
else
return DATAOUT_NORMAL;
}
static int iscsit_dataout_post_crc_failed(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
struct iscsi_conn *conn = cmd->conn;
struct iscsi_pdu *pdu;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if (conn->sess->sess_ops->DataPDUInOrder)
goto recover;
/*
* The rest of this function is only called when DataPDUInOrder=No.
*/
pdu = cmd->pdu_ptr;
switch (pdu->status) {
case ISCSI_PDU_NOT_RECEIVED:
pdu->status = ISCSI_PDU_CRC_FAILED;
break;
case ISCSI_PDU_CRC_FAILED:
break;
case ISCSI_PDU_TIMED_OUT:
pdu->status = ISCSI_PDU_CRC_FAILED;
break;
default:
return DATAOUT_CANNOT_RECOVER;
}
recover:
return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset),
payload_length);
}
/*
* Called from iscsit_handle_data_out() before DataOUT Payload is received
* and CRC computed.
*/
int iscsit_check_pre_dataout(
struct iscsi_cmd *cmd,
unsigned char *buf)
{
int ret;
struct iscsi_conn *conn = cmd->conn;
ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
(ret == DATAOUT_CANNOT_RECOVER))
return ret;
ret = iscsit_dataout_check_datasn(cmd, buf);
if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
(ret == DATAOUT_CANNOT_RECOVER))
return ret;
if (cmd->unsolicited_data) {
ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf);
if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
(ret == DATAOUT_CANNOT_RECOVER))
return ret;
} else {
ret = iscsit_dataout_check_sequence(cmd, buf);
if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
(ret == DATAOUT_CANNOT_RECOVER))
return ret;
}
return (conn->sess->sess_ops->DataPDUInOrder) ?
iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
iscsit_dataout_pre_datapduinorder_no(cmd, buf);
}
/*
* Called from iscsit_handle_data_out() after DataOUT Payload is received
* and CRC computed.
*/
int iscsit_check_post_dataout(
struct iscsi_cmd *cmd,
unsigned char *buf,
u8 data_crc_failed)
{
struct iscsi_conn *conn = cmd->conn;
cmd->dataout_timeout_retries = 0;
if (!data_crc_failed)
return iscsit_dataout_post_crc_passed(cmd, buf);
else {
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
pr_err("Unable to recover from DataOUT CRC"
" failure while ERL=0, closing session.\n");
iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
buf);
return DATAOUT_CANNOT_RECOVER;
}
iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf);
return iscsit_dataout_post_crc_failed(cmd, buf);
}
}
static void iscsit_handle_time2retain_timeout(unsigned long data)
{
struct iscsi_session *sess = (struct iscsi_session *) data;
struct iscsi_portal_group *tpg = sess->tpg;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
spin_lock_bh(&se_tpg->session_lock);
if (sess->time2retain_timer_flags & ISCSI_TF_STOP) {
spin_unlock_bh(&se_tpg->session_lock);
return;
}
if (atomic_read(&sess->session_reinstatement)) {
pr_err("Exiting Time2Retain handler because"
" session_reinstatement=1\n");
spin_unlock_bh(&se_tpg->session_lock);
return;
}
sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
pr_err("Time2Retain timer expired for SID: %u, cleaning up"
" iSCSI session.\n", sess->sid);
{
struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
if (tiqn) {
spin_lock(&tiqn->sess_err_stats.lock);
strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
(void *)sess->sess_ops->InitiatorName);
tiqn->sess_err_stats.last_sess_failure_type =
ISCSI_SESS_ERR_CXN_TIMEOUT;
tiqn->sess_err_stats.cxn_timeout_errors++;
atomic_long_inc(&sess->conn_timeout_errors);
spin_unlock(&tiqn->sess_err_stats.lock);
}
}
spin_unlock_bh(&se_tpg->session_lock);
target_put_session(sess->se_sess);
}
void iscsit_start_time2retain_handler(struct iscsi_session *sess)
{
int tpg_active;
/*
* Only start Time2Retain timer when the associated TPG is still in
* an ACTIVE (eg: not disabled or shutdown) state.
*/
spin_lock(&sess->tpg->tpg_state_lock);
tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE);
spin_unlock(&sess->tpg->tpg_state_lock);
if (!tpg_active)
return;
if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
return;
pr_debug("Starting Time2Retain timer for %u seconds on"
" SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
init_timer(&sess->time2retain_timer);
sess->time2retain_timer.expires =
(get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
sess->time2retain_timer.data = (unsigned long)sess;
sess->time2retain_timer.function = iscsit_handle_time2retain_timeout;
sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
add_timer(&sess->time2retain_timer);
}
/*
* Called with spin_lock_bh(&struct se_portal_group->session_lock) held
*/
int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
{
struct iscsi_portal_group *tpg = sess->tpg;
struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
return -1;
if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
return 0;
sess->time2retain_timer_flags |= ISCSI_TF_STOP;
spin_unlock(&se_tpg->session_lock);
del_timer_sync(&sess->time2retain_timer);
spin_lock(&se_tpg->session_lock);
sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING;
pr_debug("Stopped Time2Retain Timer for SID: %u\n",
sess->sid);
return 0;
}
void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
{
spin_lock_bh(&conn->state_lock);
if (atomic_read(&conn->connection_exit)) {
spin_unlock_bh(&conn->state_lock);
goto sleep;
}
if (atomic_read(&conn->transport_failed)) {
spin_unlock_bh(&conn->state_lock);
goto sleep;
}
spin_unlock_bh(&conn->state_lock);
iscsi_thread_set_force_reinstatement(conn);
sleep:
wait_for_completion(&conn->conn_wait_rcfr_comp);
complete(&conn->conn_post_wait_comp);
}
void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
{
spin_lock_bh(&conn->state_lock);
if (atomic_read(&conn->connection_exit)) {
spin_unlock_bh(&conn->state_lock);
return;
}
if (atomic_read(&conn->transport_failed)) {
spin_unlock_bh(&conn->state_lock);
return;
}
if (atomic_read(&conn->connection_reinstatement)) {
spin_unlock_bh(&conn->state_lock);
return;
}
if (iscsi_thread_set_force_reinstatement(conn) < 0) {
spin_unlock_bh(&conn->state_lock);
return;
}
atomic_set(&conn->connection_reinstatement, 1);
if (!sleep) {
spin_unlock_bh(&conn->state_lock);
return;
}
atomic_set(&conn->sleep_on_conn_wait_comp, 1);
spin_unlock_bh(&conn->state_lock);
wait_for_completion(&conn->conn_wait_comp);
complete(&conn->conn_post_wait_comp);
}
EXPORT_SYMBOL(iscsit_cause_connection_reinstatement);
void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
{
pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
" %u\n", sess->sid);
atomic_set(&sess->session_fall_back_to_erl0, 1);
}
static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
{
struct iscsi_session *sess = conn->sess;
if ((sess->sess_ops->ErrorRecoveryLevel == 2) &&
!atomic_read(&sess->session_reinstatement) &&
!atomic_read(&sess->session_fall_back_to_erl0))
iscsit_connection_recovery_transport_reset(conn);
else {
pr_debug("Performing cleanup for failed iSCSI"
" Connection ID: %hu from %s\n", conn->cid,
sess->sess_ops->InitiatorName);
iscsit_close_connection(conn);
}
}
void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn)
{
spin_lock_bh(&conn->state_lock);
if (atomic_read(&conn->connection_exit)) {
spin_unlock_bh(&conn->state_lock);
return;
}
atomic_set(&conn->connection_exit, 1);
if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
spin_unlock_bh(&conn->state_lock);
iscsit_close_connection(conn);
return;
}
if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
spin_unlock_bh(&conn->state_lock);
return;
}
pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
spin_unlock_bh(&conn->state_lock);
iscsit_handle_connection_cleanup(conn);
}
/*
* This is the simple function that makes the magic of
* sync and steering happen in the follow paradoxical order:
*
* 0) Receive conn->of_marker (bytes left until next OFMarker)
* bytes into an offload buffer. When we pass the exact number
* of bytes in conn->of_marker, iscsit_dump_data_payload() and hence
* rx_data() will automatically receive the identical u32 marker
* values and store it in conn->of_marker_offset;
* 1) Now conn->of_marker_offset will contain the offset to the start
* of the next iSCSI PDU. Dump these remaining bytes into another
* offload buffer.
* 2) We are done!
* Next byte in the TCP stream will contain the next iSCSI PDU!
* Cool Huh?!
*/
int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn)
{
/*
* Make sure the remaining bytes to next maker is a sane value.
*/
if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) {
pr_err("Remaining bytes to OFMarker: %u exceeds"
" OFMarkInt bytes: %u.\n", conn->of_marker,
conn->conn_ops->OFMarkInt * 4);
return -1;
}
pr_debug("Advancing %u bytes in TCP stream to get to the"
" next OFMarker.\n", conn->of_marker);
if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0)
return -1;
/*
* Make sure the offset marker we retrived is a valid value.
*/
if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) +
conn->conn_ops->MaxRecvDataSegmentLength)) {
pr_err("OfMarker offset value: %u exceeds limit.\n",
conn->of_marker_offset);
return -1;
}
pr_debug("Discarding %u bytes of TCP stream to get to the"
" next iSCSI Opcode.\n", conn->of_marker_offset);
if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0)
return -1;
return 0;
}
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