Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 936 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_erl0.c b/drivers/target/iscsi/iscsi_target_erl0.c
new file mode 100644
index 000000000..b4abd7b68
--- /dev/null
+++ b/drivers/target/iscsi/iscsi_target_erl0.c
@@ -0,0 +1,936 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ * 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>
+ *
+ ******************************************************************************/
+
+#include <linux/sched/signal.h>
+
+#include <scsi/iscsi_proto.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+
+#include <target/iscsi/iscsi_target_core.h>
+#include "iscsi_target_seq_pdu_list.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 = min(cmd->se_cmd.data_length,
+					conn->sess->sess_ops->FirstBurstLength);
+		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);
+	}
+}
+
+void iscsit_handle_time2retain_timeout(struct timer_list *t)
+{
+	struct iscsi_session *sess = from_timer(sess, t, time2retain_timer);
+	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);
+
+	iscsit_fill_cxn_timeout_err_stats(sess);
+	spin_unlock_bh(&se_tpg->session_lock);
+	iscsit_close_session(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);
+
+	sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
+	sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
+	mod_timer(&sess->time2retain_timer,
+		  jiffies + sess->sess_ops->DefaultTime2Retain * HZ);
+}
+
+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;
+
+	lockdep_assert_held(&se_tpg->session_lock);
+
+	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);
+
+	if (conn->tx_thread && conn->tx_thread_active)
+		send_sig(SIGINT, conn->tx_thread, 1);
+	if (conn->rx_thread && conn->rx_thread_active)
+		send_sig(SIGINT, conn->rx_thread, 1);
+
+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 (conn->tx_thread && conn->tx_thread_active)
+		send_sig(SIGINT, conn->tx_thread, 1);
+	if (conn->rx_thread && conn->rx_thread_active)
+		send_sig(SIGINT, conn->rx_thread, 1);
+
+	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, bool *conn_freed)
+{
+	*conn_freed = false;
+
+	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);
+		*conn_freed = true;
+		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);
+	*conn_freed = true;
+}