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936 lines
26 KiB
936 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/****************************************************************************** |
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* This file contains error recovery level zero functions used by |
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* the iSCSI Target driver. |
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* |
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* (c) Copyright 2007-2013 Datera, Inc. |
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* |
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* Author: Nicholas A. Bellinger <[email protected]> |
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* |
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******************************************************************************/ |
|
|
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#include <linux/sched/signal.h> |
|
|
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#include <scsi/iscsi_proto.h> |
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#include <target/target_core_base.h> |
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#include <target/target_core_fabric.h> |
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|
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#include <target/iscsi/iscsi_target_core.h> |
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#include "iscsi_target_seq_pdu_list.h" |
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#include "iscsi_target_erl0.h" |
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#include "iscsi_target_erl1.h" |
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#include "iscsi_target_erl2.h" |
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#include "iscsi_target_util.h" |
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#include "iscsi_target.h" |
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|
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/* |
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* Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence() |
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* checks against to determine a PDU's Offset+Length is within the current |
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* DataOUT Sequence. Used for DataSequenceInOrder=Yes only. |
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*/ |
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void iscsit_set_dataout_sequence_values( |
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struct iscsi_cmd *cmd) |
|
{ |
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struct iscsi_conn *conn = cmd->conn; |
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/* |
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* Still set seq_start_offset and seq_end_offset for Unsolicited |
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* DataOUT, even if DataSequenceInOrder=No. |
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*/ |
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if (cmd->unsolicited_data) { |
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cmd->seq_start_offset = cmd->write_data_done; |
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cmd->seq_end_offset = min(cmd->se_cmd.data_length, |
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conn->sess->sess_ops->FirstBurstLength); |
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return; |
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} |
|
|
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if (!conn->sess->sess_ops->DataSequenceInOrder) |
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return; |
|
|
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if (!cmd->seq_start_offset && !cmd->seq_end_offset) { |
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cmd->seq_start_offset = cmd->write_data_done; |
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cmd->seq_end_offset = (cmd->se_cmd.data_length > |
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conn->sess->sess_ops->MaxBurstLength) ? |
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(cmd->write_data_done + |
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conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length; |
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} else { |
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cmd->seq_start_offset = cmd->seq_end_offset; |
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cmd->seq_end_offset = ((cmd->seq_end_offset + |
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conn->sess->sess_ops->MaxBurstLength) >= |
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cmd->se_cmd.data_length) ? cmd->se_cmd.data_length : |
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(cmd->seq_end_offset + |
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conn->sess->sess_ops->MaxBurstLength); |
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} |
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} |
|
|
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static int iscsit_dataout_within_command_recovery_check( |
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struct iscsi_cmd *cmd, |
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unsigned char *buf) |
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{ |
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struct iscsi_conn *conn = cmd->conn; |
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struct iscsi_data *hdr = (struct iscsi_data *) buf; |
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u32 payload_length = ntoh24(hdr->dlength); |
|
|
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/* |
|
* We do the within-command recovery checks here as it is |
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* the first function called in iscsi_check_pre_dataout(). |
|
* Basically, if we are in within-command recovery and |
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* the PDU does not contain the offset the sequence needs, |
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* dump the payload. |
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* |
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* This only applies to DataPDUInOrder=Yes, for |
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* DataPDUInOrder=No we only re-request the failed PDU |
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* and check that all PDUs in a sequence are received |
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* upon end of sequence. |
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*/ |
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if (conn->sess->sess_ops->DataSequenceInOrder) { |
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if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) && |
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cmd->write_data_done != be32_to_cpu(hdr->offset)) |
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goto dump; |
|
|
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cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY; |
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} else { |
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struct iscsi_seq *seq; |
|
|
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seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
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payload_length); |
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if (!seq) |
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return DATAOUT_CANNOT_RECOVER; |
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/* |
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* Set the struct iscsi_seq pointer to reuse later. |
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*/ |
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cmd->seq_ptr = seq; |
|
|
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if (conn->sess->sess_ops->DataPDUInOrder) { |
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if (seq->status == |
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DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && |
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(seq->offset != be32_to_cpu(hdr->offset) || |
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seq->data_sn != be32_to_cpu(hdr->datasn))) |
|
goto dump; |
|
} else { |
|
if (seq->status == |
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DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && |
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seq->data_sn != be32_to_cpu(hdr->datasn)) |
|
goto dump; |
|
} |
|
|
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if (seq->status == DATAOUT_SEQUENCE_COMPLETE) |
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goto dump; |
|
|
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if (seq->status != DATAOUT_SEQUENCE_COMPLETE) |
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seq->status = 0; |
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} |
|
|
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return DATAOUT_NORMAL; |
|
|
|
dump: |
|
pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:" |
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" 0x%08x\n", hdr->offset, payload_length, hdr->datasn); |
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return iscsit_dump_data_payload(conn, payload_length, 1); |
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} |
|
|
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static int iscsit_dataout_check_unsolicited_sequence( |
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struct iscsi_cmd *cmd, |
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unsigned char *buf) |
|
{ |
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u32 first_burst_len; |
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struct iscsi_conn *conn = cmd->conn; |
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struct iscsi_data *hdr = (struct iscsi_data *) buf; |
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u32 payload_length = ntoh24(hdr->dlength); |
|
|
|
|
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if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
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((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { |
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pr_err("Command ITT: 0x%08x with Offset: %u," |
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" Length: %u outside of Unsolicited Sequence %u:%u while" |
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" DataSequenceInOrder=Yes.\n", cmd->init_task_tag, |
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be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
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cmd->seq_end_offset); |
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return DATAOUT_CANNOT_RECOVER; |
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} |
|
|
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first_burst_len = (cmd->first_burst_len + payload_length); |
|
|
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if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) { |
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pr_err("Total %u bytes exceeds FirstBurstLength: %u" |
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" for this Unsolicited DataOut Burst.\n", |
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first_burst_len, conn->sess->sess_ops->FirstBurstLength); |
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transport_send_check_condition_and_sense(&cmd->se_cmd, |
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TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
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return DATAOUT_CANNOT_RECOVER; |
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} |
|
|
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/* |
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* Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity |
|
* checks for the current Unsolicited DataOUT Sequence. |
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*/ |
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if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { |
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/* |
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* Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of |
|
* sequence checks are handled in |
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* iscsit_dataout_datapduinorder_no_fbit(). |
|
*/ |
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if (!conn->sess->sess_ops->DataPDUInOrder) |
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goto out; |
|
|
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if ((first_burst_len != cmd->se_cmd.data_length) && |
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(first_burst_len != conn->sess->sess_ops->FirstBurstLength)) { |
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pr_err("Unsolicited non-immediate data" |
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" received %u does not equal FirstBurstLength: %u, and" |
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" does not equal ExpXferLen %u.\n", first_burst_len, |
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conn->sess->sess_ops->FirstBurstLength, |
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cmd->se_cmd.data_length); |
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transport_send_check_condition_and_sense(&cmd->se_cmd, |
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TCM_INCORRECT_AMOUNT_OF_DATA, 0); |
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return DATAOUT_CANNOT_RECOVER; |
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} |
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} else { |
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if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) { |
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pr_err("Command ITT: 0x%08x reached" |
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" FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" |
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" error.\n", cmd->init_task_tag, |
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conn->sess->sess_ops->FirstBurstLength); |
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return DATAOUT_CANNOT_RECOVER; |
|
} |
|
if (first_burst_len == cmd->se_cmd.data_length) { |
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pr_err("Command ITT: 0x%08x reached" |
|
" ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" |
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" error.\n", cmd->init_task_tag, cmd->se_cmd.data_length); |
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return DATAOUT_CANNOT_RECOVER; |
|
} |
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} |
|
|
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out: |
|
return DATAOUT_NORMAL; |
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} |
|
|
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static int iscsit_dataout_check_sequence( |
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struct iscsi_cmd *cmd, |
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unsigned char *buf) |
|
{ |
|
u32 next_burst_len; |
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struct iscsi_conn *conn = cmd->conn; |
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struct iscsi_seq *seq = NULL; |
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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(). |
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* |
|
* 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 |
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* payload here, instead of erroring out. |
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*/ |
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if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
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((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { |
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pr_err("Command ITT: 0x%08x with Offset: %u," |
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" Length: %u outside of Sequence %u:%u while" |
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" DataSequenceInOrder=Yes.\n", cmd->init_task_tag, |
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be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
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cmd->seq_end_offset); |
|
|
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if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
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return DATAOUT_CANNOT_RECOVER; |
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return DATAOUT_WITHIN_COMMAND_RECOVERY; |
|
} |
|
|
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next_burst_len = (cmd->next_burst_len + payload_length); |
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} else { |
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seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
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payload_length); |
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if (!seq) |
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return DATAOUT_CANNOT_RECOVER; |
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/* |
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* Set the struct iscsi_seq pointer to reuse later. |
|
*/ |
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cmd->seq_ptr = seq; |
|
|
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if (seq->status == DATAOUT_SEQUENCE_COMPLETE) { |
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if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) |
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return DATAOUT_CANNOT_RECOVER; |
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return DATAOUT_WITHIN_COMMAND_RECOVERY; |
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} |
|
|
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next_burst_len = (seq->next_burst_len + payload_length); |
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} |
|
|
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if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) { |
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pr_err("Command ITT: 0x%08x, NextBurstLength: %u and" |
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" Length: %u exceeds MaxBurstLength: %u. protocol" |
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" error.\n", cmd->init_task_tag, |
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(next_burst_len - payload_length), |
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payload_length, conn->sess->sess_ops->MaxBurstLength); |
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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) { |
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/* |
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* Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of |
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* sequence checks are handled in |
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* iscsit_dataout_datapduinorder_no_fbit(). |
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*/ |
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if (!conn->sess->sess_ops->DataPDUInOrder) |
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goto out; |
|
|
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if (conn->sess->sess_ops->DataSequenceInOrder) { |
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if ((next_burst_len < |
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conn->sess->sess_ops->MaxBurstLength) && |
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((cmd->write_data_done + payload_length) < |
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cmd->se_cmd.data_length)) { |
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pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" |
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" before end of DataOUT sequence, protocol" |
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" error.\n", cmd->init_task_tag); |
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return DATAOUT_CANNOT_RECOVER; |
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} |
|
} else { |
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if (next_burst_len < seq->xfer_len) { |
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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 { |
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if (conn->sess->sess_ops->DataSequenceInOrder) { |
|
if (next_burst_len == |
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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, false); |
|
} |
|
|
|
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; |
|
}
|
|
|