![Nicholas Bellinger](/assets/img/avatar_default.png)
This patch converts iscsi-target session code to use se_sess->sess_kref counting for iscsi session shutdown. The following cases include: *) last iscsit_close_connection() shutdown path to invoke close session *) iscsit_logout_post_handler_closesession() for explict logout *) iscsit_free_session() caller for explict shutdown It also moves iscsit_stop_session() call from lio_tpg_close_session() into lio_tpg_shutdown_session() TFO callbacks to invoke an explict shutdown, and also changes iscsi_check_for_session_reinstatement() login code to use se_sess->sess_kref. (v2: Make iscsit_handle_time2retain_timeout() use target_put_session) Cc: Andy Grover <agrover@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
1005 lines
28 KiB
C
1005 lines
28 KiB
C
/******************************************************************************
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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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* \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
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*
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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*
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* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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******************************************************************************/
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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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#include "iscsi_target_core.h"
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#include "iscsi_target_seq_pdu_list.h"
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#include "iscsi_target_tq.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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* 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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{
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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 = (cmd->write_data_done +
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(cmd->data_length >
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conn->sess->sess_ops->FirstBurstLength) ?
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conn->sess->sess_ops->FirstBurstLength : cmd->data_length);
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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->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->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->data_length) ? 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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/*
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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().
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* 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 != 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, hdr->offset, 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 != hdr->offset) ||
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(seq->data_sn != hdr->datasn)))
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goto dump;
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} else {
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if ((seq->status ==
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DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) &&
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(seq->data_sn != hdr->datasn))
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goto dump;
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}
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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;
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dump:
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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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{
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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 ((hdr->offset < cmd->seq_start_offset) ||
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((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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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
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* 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
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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 ((first_burst_len != 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->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;
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}
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if (first_burst_len == cmd->data_length) {
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pr_err("Command ITT: 0x%08x reached"
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" ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
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" error.\n", cmd->init_task_tag, cmd->data_length);
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return DATAOUT_CANNOT_RECOVER;
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}
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}
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out:
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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)
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{
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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;
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u32 payload_length = ntoh24(hdr->dlength);
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/*
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* For DataSequenceInOrder=Yes: Check that the offset and offset+length
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* is within range as defined by iscsi_set_dataout_sequence_values().
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*
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* For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
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* offset+length tuple.
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*/
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if (conn->sess->sess_ops->DataSequenceInOrder) {
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/*
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* Due to possibility of recovery DataOUT sent by the initiator
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* 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 ((hdr->offset < cmd->seq_start_offset) ||
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((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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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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}
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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, hdr->offset, 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 (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;
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}
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/*
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* Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
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* checks for the current 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
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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->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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}
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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"
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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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}
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}
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} else {
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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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pr_err("Command ITT: 0x%08x reached"
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" MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
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" not set, protocol error.", cmd->init_task_tag,
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conn->sess->sess_ops->MaxBurstLength);
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return DATAOUT_CANNOT_RECOVER;
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}
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if ((cmd->write_data_done + payload_length) ==
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cmd->data_length) {
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pr_err("Command ITT: 0x%08x reached"
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" last DataOUT PDU in sequence but ISCSI_FLAG_"
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"CMD_FINAL is not set, protocol error.\n",
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cmd->init_task_tag);
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return DATAOUT_CANNOT_RECOVER;
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}
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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 reached"
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" last DataOUT PDU in sequence but ISCSI_FLAG_"
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"CMD_FINAL is not set, protocol error.\n",
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cmd->init_task_tag);
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return DATAOUT_CANNOT_RECOVER;
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}
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}
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}
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out:
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return DATAOUT_NORMAL;
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}
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static int iscsit_dataout_check_datasn(
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struct iscsi_cmd *cmd,
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unsigned char *buf)
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{
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int dump = 0, recovery = 0;
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u32 data_sn = 0;
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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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/*
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* Considering the target has no method of re-requesting DataOUT
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* by DataSN, if we receieve a greater DataSN than expected we
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* assume the functions for DataPDUInOrder=[Yes,No] below will
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* handle it.
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*
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* If the DataSN is less than expected, dump the payload.
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*/
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if (conn->sess->sess_ops->DataSequenceInOrder)
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data_sn = cmd->data_sn;
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else {
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struct iscsi_seq *seq = cmd->seq_ptr;
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data_sn = seq->data_sn;
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}
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if (hdr->datasn > data_sn) {
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pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
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" higher than expected 0x%08x.\n", cmd->init_task_tag,
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hdr->datasn, data_sn);
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recovery = 1;
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goto recover;
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} else if (hdr->datasn < data_sn) {
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pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
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" lower than expected 0x%08x, discarding payload.\n",
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cmd->init_task_tag, hdr->datasn, data_sn);
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dump = 1;
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goto dump;
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}
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return DATAOUT_NORMAL;
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recover:
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if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
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pr_err("Unable to perform within-command recovery"
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" while ERL=0.\n");
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return DATAOUT_CANNOT_RECOVER;
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}
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dump:
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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 (recovery || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY :
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DATAOUT_NORMAL;
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}
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static int iscsit_dataout_pre_datapduinorder_yes(
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struct iscsi_cmd *cmd,
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unsigned char *buf)
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{
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int dump = 0, recovery = 0;
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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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/*
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* For DataSequenceInOrder=Yes: If the offset is greater than the global
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* DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
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* occured and fail the connection.
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*
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* For DataSequenceInOrder=No: If the offset is greater than the per
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* sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
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* error has occured and fail the connection.
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*/
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if (conn->sess->sess_ops->DataSequenceInOrder) {
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if (hdr->offset != cmd->write_data_done) {
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pr_err("Command ITT: 0x%08x, received offset"
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" %u different than expected %u.\n", cmd->init_task_tag,
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hdr->offset, cmd->write_data_done);
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recovery = 1;
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goto recover;
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}
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} else {
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struct iscsi_seq *seq = cmd->seq_ptr;
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if (hdr->offset > seq->offset) {
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pr_err("Command ITT: 0x%08x, received offset"
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" %u greater than expected %u.\n", cmd->init_task_tag,
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hdr->offset, seq->offset);
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recovery = 1;
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goto recover;
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} else if (hdr->offset < seq->offset) {
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pr_err("Command ITT: 0x%08x, received offset"
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" %u less than expected %u, discarding payload.\n",
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cmd->init_task_tag, hdr->offset, seq->offset);
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dump = 1;
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goto dump;
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}
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}
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return DATAOUT_NORMAL;
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recover:
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if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
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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,
|
|
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, 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,
|
|
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, 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,
|
|
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, 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, 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, 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, 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;
|
|
|
|
return (cmd->write_data_done == cmd->data_length) ?
|
|
DATAOUT_SEND_TO_TRANSPORT : (send_r2t) ?
|
|
DATAOUT_SEND_R2T : 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, hdr->offset, payload_length);
|
|
}
|
|
|
|
/*
|
|
* Called from iscsit_handle_data_out() before DataOUT Payload is received
|
|
* and CRC computed.
|
|
*/
|
|
extern 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_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
|
|
1, 0, buf, cmd);
|
|
return DATAOUT_CANNOT_RECOVER;
|
|
}
|
|
|
|
iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
|
|
0, 0, buf, cmd);
|
|
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 = ISCSI_TPG_S(sess);
|
|
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++;
|
|
sess->conn_timeout_errors++;
|
|
spin_unlock(&tiqn->sess_err_stats.lock);
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&se_tpg->session_lock);
|
|
target_put_session(sess->se_sess);
|
|
}
|
|
|
|
extern void iscsit_start_time2retain_handler(struct iscsi_session *sess)
|
|
{
|
|
int tpg_active;
|
|
/*
|
|
* Only start Time2Retain timer when the assoicated TPG is still in
|
|
* an ACTIVE (eg: not disabled or shutdown) state.
|
|
*/
|
|
spin_lock(&ISCSI_TPG_S(sess)->tpg_state_lock);
|
|
tpg_active = (ISCSI_TPG_S(sess)->tpg_state == TPG_STATE_ACTIVE);
|
|
spin_unlock(&ISCSI_TPG_S(sess)->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
|
|
*/
|
|
extern int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
|
|
{
|
|
struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
|
|
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_bh(&se_tpg->session_lock);
|
|
|
|
del_timer_sync(&sess->time2retain_timer);
|
|
|
|
spin_lock_bh(&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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
extern 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;
|
|
}
|