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Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1241 lines
31 KiB
C
1241 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* This file contains error recovery level one used by 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 <nab@linux-iscsi.org>
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*
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******************************************************************************/
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#include <linux/list.h>
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#include <linux/slab.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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#include <target/iscsi/iscsi_transport.h>
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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_datain_values.h"
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#include "iscsi_target_device.h"
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#include "iscsi_target_tpg.h"
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#include "iscsi_target_util.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.h"
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#define OFFLOAD_BUF_SIZE 32768U
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/*
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* Used to dump excess datain payload for certain error recovery
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* situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data().
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*
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* dump_padding_digest denotes if padding and data digests need
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* to be dumped.
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*/
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int iscsit_dump_data_payload(
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struct iscsi_conn *conn,
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u32 buf_len,
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int dump_padding_digest)
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{
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char *buf;
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int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
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u32 length, offset = 0, size;
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struct kvec iov;
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if (conn->sess->sess_ops->RDMAExtensions)
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return 0;
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if (dump_padding_digest) {
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buf_len = ALIGN(buf_len, 4);
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if (conn->conn_ops->DataDigest)
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buf_len += ISCSI_CRC_LEN;
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}
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length = min(buf_len, OFFLOAD_BUF_SIZE);
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buf = kzalloc(length, GFP_ATOMIC);
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if (!buf) {
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pr_err("Unable to allocate %u bytes for offload"
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" buffer.\n", length);
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return -1;
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}
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memset(&iov, 0, sizeof(struct kvec));
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while (offset < buf_len) {
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size = min(buf_len - offset, length);
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iov.iov_len = size;
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iov.iov_base = buf;
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rx_got = rx_data(conn, &iov, 1, size);
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if (rx_got != size) {
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ret = DATAOUT_CANNOT_RECOVER;
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break;
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}
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offset += size;
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}
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kfree(buf);
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return ret;
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}
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/*
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* Used for retransmitting R2Ts from a R2T SNACK request.
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*/
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static int iscsit_send_recovery_r2t_for_snack(
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struct iscsi_cmd *cmd,
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struct iscsi_r2t *r2t)
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{
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/*
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* If the struct iscsi_r2t has not been sent yet, we can safely
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* ignore retransmission
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* of the R2TSN in question.
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*/
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spin_lock_bh(&cmd->r2t_lock);
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if (!r2t->sent_r2t) {
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spin_unlock_bh(&cmd->r2t_lock);
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return 0;
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}
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r2t->sent_r2t = 0;
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spin_unlock_bh(&cmd->r2t_lock);
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iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
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return 0;
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}
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static int iscsit_handle_r2t_snack(
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struct iscsi_cmd *cmd,
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unsigned char *buf,
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u32 begrun,
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u32 runlength)
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{
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u32 last_r2tsn;
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struct iscsi_r2t *r2t;
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/*
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* Make sure the initiator is not requesting retransmission
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* of R2TSNs already acknowledged by a TMR TASK_REASSIGN.
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*/
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if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
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(begrun <= cmd->acked_data_sn)) {
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pr_err("ITT: 0x%08x, R2T SNACK requesting"
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" retransmission of R2TSN: 0x%08x to 0x%08x but already"
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" acked to R2TSN: 0x%08x by TMR TASK_REASSIGN,"
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" protocol error.\n", cmd->init_task_tag, begrun,
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(begrun + runlength), cmd->acked_data_sn);
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return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
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}
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if (runlength) {
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if ((begrun + runlength) > cmd->r2t_sn) {
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pr_err("Command ITT: 0x%08x received R2T SNACK"
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" with BegRun: 0x%08x, RunLength: 0x%08x, exceeds"
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" current R2TSN: 0x%08x, protocol error.\n",
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cmd->init_task_tag, begrun, runlength, cmd->r2t_sn);
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return iscsit_reject_cmd(cmd,
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ISCSI_REASON_BOOKMARK_INVALID, buf);
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}
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last_r2tsn = (begrun + runlength);
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} else
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last_r2tsn = cmd->r2t_sn;
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while (begrun < last_r2tsn) {
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r2t = iscsit_get_holder_for_r2tsn(cmd, begrun);
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if (!r2t)
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return -1;
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if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0)
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return -1;
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begrun++;
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}
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return 0;
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}
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/*
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* Generates Offsets and NextBurstLength based on Begrun and Runlength
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* carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
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*
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* For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only.
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*
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* FIXME: How is this handled for a RData SNACK?
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*/
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int iscsit_create_recovery_datain_values_datasequenceinorder_yes(
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struct iscsi_cmd *cmd,
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struct iscsi_datain_req *dr)
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{
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u32 data_sn = 0, data_sn_count = 0;
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u32 pdu_start = 0, seq_no = 0;
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u32 begrun = dr->begrun;
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struct iscsi_conn *conn = cmd->conn;
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while (begrun > data_sn++) {
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data_sn_count++;
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if ((dr->next_burst_len +
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conn->conn_ops->MaxRecvDataSegmentLength) <
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conn->sess->sess_ops->MaxBurstLength) {
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dr->read_data_done +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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dr->next_burst_len +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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} else {
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dr->read_data_done +=
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(conn->sess->sess_ops->MaxBurstLength -
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dr->next_burst_len);
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dr->next_burst_len = 0;
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pdu_start += data_sn_count;
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data_sn_count = 0;
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seq_no++;
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}
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}
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if (!conn->sess->sess_ops->DataPDUInOrder) {
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cmd->seq_no = seq_no;
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cmd->pdu_start = pdu_start;
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cmd->pdu_send_order = data_sn_count;
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}
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return 0;
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}
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/*
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* Generates Offsets and NextBurstLength based on Begrun and Runlength
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* carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
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*
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* For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only.
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*
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* FIXME: How is this handled for a RData SNACK?
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*/
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int iscsit_create_recovery_datain_values_datasequenceinorder_no(
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struct iscsi_cmd *cmd,
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struct iscsi_datain_req *dr)
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{
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int found_seq = 0, i;
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u32 data_sn, read_data_done = 0, seq_send_order = 0;
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u32 begrun = dr->begrun;
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u32 runlength = dr->runlength;
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_seq *first_seq = NULL, *seq = NULL;
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if (!cmd->seq_list) {
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pr_err("struct iscsi_cmd->seq_list is NULL!\n");
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return -1;
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}
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/*
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* Calculate read_data_done for all sequences containing a
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* first_datasn and last_datasn less than the BegRun.
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*
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* Locate the struct iscsi_seq the BegRun lies within and calculate
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* NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength.
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*
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* Also use struct iscsi_seq->seq_send_order to determine where to start.
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*/
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for (i = 0; i < cmd->seq_count; i++) {
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seq = &cmd->seq_list[i];
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if (!seq->seq_send_order)
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first_seq = seq;
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/*
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* No data has been transferred for this DataIN sequence, so the
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* seq->first_datasn and seq->last_datasn have not been set.
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*/
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if (!seq->sent) {
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pr_err("Ignoring non-sent sequence 0x%08x ->"
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" 0x%08x\n\n", seq->first_datasn,
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seq->last_datasn);
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continue;
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}
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/*
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* This DataIN sequence is precedes the received BegRun, add the
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* total xfer_len of the sequence to read_data_done and reset
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* seq->pdu_send_order.
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*/
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if ((seq->first_datasn < begrun) &&
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(seq->last_datasn < begrun)) {
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pr_err("Pre BegRun sequence 0x%08x ->"
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" 0x%08x\n", seq->first_datasn,
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seq->last_datasn);
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read_data_done += cmd->seq_list[i].xfer_len;
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seq->next_burst_len = seq->pdu_send_order = 0;
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continue;
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}
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/*
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* The BegRun lies within this DataIN sequence.
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*/
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if ((seq->first_datasn <= begrun) &&
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(seq->last_datasn >= begrun)) {
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pr_err("Found sequence begrun: 0x%08x in"
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" 0x%08x -> 0x%08x\n", begrun,
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seq->first_datasn, seq->last_datasn);
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seq_send_order = seq->seq_send_order;
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data_sn = seq->first_datasn;
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seq->next_burst_len = seq->pdu_send_order = 0;
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found_seq = 1;
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/*
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* For DataPDUInOrder=Yes, while the first DataSN of
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* the sequence is less than the received BegRun, add
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* the MaxRecvDataSegmentLength to read_data_done and
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* to the sequence's next_burst_len;
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*
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* For DataPDUInOrder=No, while the first DataSN of the
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* sequence is less than the received BegRun, find the
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* struct iscsi_pdu of the DataSN in question and add the
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* MaxRecvDataSegmentLength to read_data_done and to the
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* sequence's next_burst_len;
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*/
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if (conn->sess->sess_ops->DataPDUInOrder) {
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while (data_sn < begrun) {
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seq->pdu_send_order++;
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read_data_done +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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seq->next_burst_len +=
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conn->conn_ops->MaxRecvDataSegmentLength;
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data_sn++;
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}
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} else {
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int j;
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struct iscsi_pdu *pdu;
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while (data_sn < begrun) {
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seq->pdu_send_order++;
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for (j = 0; j < seq->pdu_count; j++) {
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pdu = &cmd->pdu_list[
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seq->pdu_start + j];
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if (pdu->data_sn == data_sn) {
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read_data_done +=
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pdu->length;
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seq->next_burst_len +=
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pdu->length;
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}
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}
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data_sn++;
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}
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}
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continue;
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}
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/*
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* This DataIN sequence is larger than the received BegRun,
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* reset seq->pdu_send_order and continue.
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*/
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if ((seq->first_datasn > begrun) ||
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(seq->last_datasn > begrun)) {
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pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n",
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seq->first_datasn, seq->last_datasn);
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seq->next_burst_len = seq->pdu_send_order = 0;
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continue;
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}
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}
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if (!found_seq) {
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if (!begrun) {
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if (!first_seq) {
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pr_err("ITT: 0x%08x, Begrun: 0x%08x"
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" but first_seq is NULL\n",
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cmd->init_task_tag, begrun);
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return -1;
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}
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seq_send_order = first_seq->seq_send_order;
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seq->next_burst_len = seq->pdu_send_order = 0;
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goto done;
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}
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pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x,"
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" BegRun: 0x%08x, RunLength: 0x%08x while"
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" DataSequenceInOrder=No and DataPDUInOrder=%s.\n",
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cmd->init_task_tag, begrun, runlength,
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(conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No");
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return -1;
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}
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done:
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dr->read_data_done = read_data_done;
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dr->seq_send_order = seq_send_order;
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return 0;
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}
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static int iscsit_handle_recovery_datain(
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struct iscsi_cmd *cmd,
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unsigned char *buf,
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u32 begrun,
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u32 runlength)
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{
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struct iscsi_conn *conn = cmd->conn;
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struct iscsi_datain_req *dr;
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struct se_cmd *se_cmd = &cmd->se_cmd;
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if (!(se_cmd->transport_state & CMD_T_COMPLETE)) {
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pr_err("Ignoring ITT: 0x%08x Data SNACK\n",
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cmd->init_task_tag);
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return 0;
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}
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/*
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* Make sure the initiator is not requesting retransmission
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* of DataSNs already acknowledged by a Data ACK SNACK.
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*/
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if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
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(begrun <= cmd->acked_data_sn)) {
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pr_err("ITT: 0x%08x, Data SNACK requesting"
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" retransmission of DataSN: 0x%08x to 0x%08x but"
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" already acked to DataSN: 0x%08x by Data ACK SNACK,"
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" protocol error.\n", cmd->init_task_tag, begrun,
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(begrun + runlength), cmd->acked_data_sn);
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return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
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}
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/*
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* Make sure BegRun and RunLength in the Data SNACK are sane.
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* Note: (cmd->data_sn - 1) will carry the maximum DataSN sent.
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*/
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if ((begrun + runlength) > (cmd->data_sn - 1)) {
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pr_err("Initiator requesting BegRun: 0x%08x, RunLength"
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": 0x%08x greater than maximum DataSN: 0x%08x.\n",
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begrun, runlength, (cmd->data_sn - 1));
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return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID,
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buf);
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}
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dr = iscsit_allocate_datain_req();
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if (!dr)
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return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
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buf);
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dr->data_sn = dr->begrun = begrun;
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dr->runlength = runlength;
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dr->generate_recovery_values = 1;
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dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY;
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iscsit_attach_datain_req(cmd, dr);
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cmd->i_state = ISTATE_SEND_DATAIN;
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iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
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return 0;
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}
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int iscsit_handle_recovery_datain_or_r2t(
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struct iscsi_conn *conn,
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unsigned char *buf,
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itt_t init_task_tag,
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u32 targ_xfer_tag,
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u32 begrun,
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u32 runlength)
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{
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struct iscsi_cmd *cmd;
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cmd = iscsit_find_cmd_from_itt(conn, init_task_tag);
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if (!cmd)
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return 0;
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/*
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* FIXME: This will not work for bidi commands.
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*/
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switch (cmd->data_direction) {
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case DMA_TO_DEVICE:
|
|
return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength);
|
|
case DMA_FROM_DEVICE:
|
|
return iscsit_handle_recovery_datain(cmd, buf, begrun,
|
|
runlength);
|
|
default:
|
|
pr_err("Unknown cmd->data_direction: 0x%02x\n",
|
|
cmd->data_direction);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */
|
|
int iscsit_handle_status_snack(
|
|
struct iscsi_conn *conn,
|
|
itt_t init_task_tag,
|
|
u32 targ_xfer_tag,
|
|
u32 begrun,
|
|
u32 runlength)
|
|
{
|
|
struct iscsi_cmd *cmd = NULL;
|
|
u32 last_statsn;
|
|
int found_cmd;
|
|
|
|
if (!begrun) {
|
|
begrun = conn->exp_statsn;
|
|
} else if (conn->exp_statsn > begrun) {
|
|
pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:"
|
|
" 0x%08x but already got ExpStatSN: 0x%08x on CID:"
|
|
" %hu.\n", begrun, runlength, conn->exp_statsn,
|
|
conn->cid);
|
|
return 0;
|
|
}
|
|
|
|
last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength);
|
|
|
|
while (begrun < last_statsn) {
|
|
found_cmd = 0;
|
|
|
|
spin_lock_bh(&conn->cmd_lock);
|
|
list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
|
|
if (cmd->stat_sn == begrun) {
|
|
found_cmd = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&conn->cmd_lock);
|
|
|
|
if (!found_cmd) {
|
|
pr_err("Unable to find StatSN: 0x%08x for"
|
|
" a Status SNACK, assuming this was a"
|
|
" protactic SNACK for an untransmitted"
|
|
" StatSN, ignoring.\n", begrun);
|
|
begrun++;
|
|
continue;
|
|
}
|
|
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
if (cmd->i_state == ISTATE_SEND_DATAIN) {
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
pr_err("Ignoring Status SNACK for BegRun:"
|
|
" 0x%08x, RunLength: 0x%08x, assuming this was"
|
|
" a protactic SNACK for an untransmitted"
|
|
" StatSN\n", begrun, runlength);
|
|
begrun++;
|
|
continue;
|
|
}
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
cmd->i_state = ISTATE_SEND_STATUS_RECOVERY;
|
|
iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
|
|
begrun++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iscsit_handle_data_ack(
|
|
struct iscsi_conn *conn,
|
|
u32 targ_xfer_tag,
|
|
u32 begrun,
|
|
u32 runlength)
|
|
{
|
|
struct iscsi_cmd *cmd = NULL;
|
|
|
|
cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag);
|
|
if (!cmd) {
|
|
pr_err("Data ACK SNACK for TTT: 0x%08x is"
|
|
" invalid.\n", targ_xfer_tag);
|
|
return -1;
|
|
}
|
|
|
|
if (begrun <= cmd->acked_data_sn) {
|
|
pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is"
|
|
" less than the already acked DataSN: 0x%08x.\n",
|
|
cmd->init_task_tag, begrun, cmd->acked_data_sn);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* For Data ACK SNACK, BegRun is the next expected DataSN.
|
|
* (see iSCSI v19: 10.16.6)
|
|
*/
|
|
cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
|
|
cmd->acked_data_sn = (begrun - 1);
|
|
|
|
pr_debug("Received Data ACK SNACK for ITT: 0x%08x,"
|
|
" updated acked DataSN to 0x%08x.\n",
|
|
cmd->init_task_tag, cmd->acked_data_sn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsit_send_recovery_r2t(
|
|
struct iscsi_cmd *cmd,
|
|
u32 offset,
|
|
u32 xfer_len)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_bh(&cmd->r2t_lock);
|
|
ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0);
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int iscsit_dataout_datapduinorder_no_fbit(
|
|
struct iscsi_cmd *cmd,
|
|
struct iscsi_pdu *pdu)
|
|
{
|
|
int i, send_recovery_r2t = 0, recovery = 0;
|
|
u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0;
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct iscsi_pdu *first_pdu = NULL;
|
|
|
|
/*
|
|
* Get an struct iscsi_pdu pointer to the first PDU, and total PDU count
|
|
* of the DataOUT sequence.
|
|
*/
|
|
if (conn->sess->sess_ops->DataSequenceInOrder) {
|
|
for (i = 0; i < cmd->pdu_count; i++) {
|
|
if (cmd->pdu_list[i].seq_no == pdu->seq_no) {
|
|
if (!first_pdu)
|
|
first_pdu = &cmd->pdu_list[i];
|
|
xfer_len += cmd->pdu_list[i].length;
|
|
pdu_count++;
|
|
} else if (pdu_count)
|
|
break;
|
|
}
|
|
} else {
|
|
struct iscsi_seq *seq = cmd->seq_ptr;
|
|
|
|
first_pdu = &cmd->pdu_list[seq->pdu_start];
|
|
pdu_count = seq->pdu_count;
|
|
}
|
|
|
|
if (!first_pdu || !pdu_count)
|
|
return DATAOUT_CANNOT_RECOVER;
|
|
|
|
/*
|
|
* Loop through the ending DataOUT Sequence checking each struct iscsi_pdu.
|
|
* The following ugly logic does batching of not received PDUs.
|
|
*/
|
|
for (i = 0; i < pdu_count; i++) {
|
|
if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) {
|
|
if (!send_recovery_r2t)
|
|
continue;
|
|
|
|
if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
|
|
return DATAOUT_CANNOT_RECOVER;
|
|
|
|
send_recovery_r2t = length = offset = 0;
|
|
continue;
|
|
}
|
|
/*
|
|
* Set recovery = 1 for any missing, CRC failed, or timed
|
|
* out PDUs to let the DataOUT logic know that this sequence
|
|
* has not been completed yet.
|
|
*
|
|
* Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED.
|
|
* We assume if the PDU either failed CRC or timed out
|
|
* that a Recovery R2T has already been sent.
|
|
*/
|
|
recovery = 1;
|
|
|
|
if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED)
|
|
continue;
|
|
|
|
if (!offset)
|
|
offset = first_pdu[i].offset;
|
|
length += first_pdu[i].length;
|
|
|
|
send_recovery_r2t = 1;
|
|
}
|
|
|
|
if (send_recovery_r2t)
|
|
if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
|
|
return DATAOUT_CANNOT_RECOVER;
|
|
|
|
return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY;
|
|
}
|
|
|
|
static int iscsit_recalculate_dataout_values(
|
|
struct iscsi_cmd *cmd,
|
|
u32 pdu_offset,
|
|
u32 pdu_length,
|
|
u32 *r2t_offset,
|
|
u32 *r2t_length)
|
|
{
|
|
int i;
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct iscsi_pdu *pdu = NULL;
|
|
|
|
if (conn->sess->sess_ops->DataSequenceInOrder) {
|
|
cmd->data_sn = 0;
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder) {
|
|
*r2t_offset = cmd->write_data_done;
|
|
*r2t_length = (cmd->seq_end_offset -
|
|
cmd->write_data_done);
|
|
return 0;
|
|
}
|
|
|
|
*r2t_offset = cmd->seq_start_offset;
|
|
*r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset);
|
|
|
|
for (i = 0; i < cmd->pdu_count; i++) {
|
|
pdu = &cmd->pdu_list[i];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
if ((pdu->offset >= cmd->seq_start_offset) &&
|
|
((pdu->offset + pdu->length) <=
|
|
cmd->seq_end_offset)) {
|
|
if (!cmd->unsolicited_data)
|
|
cmd->next_burst_len -= pdu->length;
|
|
else
|
|
cmd->first_burst_len -= pdu->length;
|
|
|
|
cmd->write_data_done -= pdu->length;
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
} else {
|
|
struct iscsi_seq *seq = NULL;
|
|
|
|
seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length);
|
|
if (!seq)
|
|
return -1;
|
|
|
|
*r2t_offset = seq->orig_offset;
|
|
*r2t_length = seq->xfer_len;
|
|
|
|
cmd->write_data_done -= (seq->offset - seq->orig_offset);
|
|
if (cmd->immediate_data)
|
|
cmd->first_burst_len = cmd->write_data_done;
|
|
|
|
seq->data_sn = 0;
|
|
seq->offset = seq->orig_offset;
|
|
seq->next_burst_len = 0;
|
|
seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
|
|
|
|
if (conn->sess->sess_ops->DataPDUInOrder)
|
|
return 0;
|
|
|
|
for (i = 0; i < seq->pdu_count; i++) {
|
|
pdu = &cmd->pdu_list[i+seq->pdu_start];
|
|
|
|
if (pdu->status != ISCSI_PDU_RECEIVED_OK)
|
|
continue;
|
|
|
|
pdu->status = ISCSI_PDU_NOT_RECEIVED;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iscsit_recover_dataout_sequence(
|
|
struct iscsi_cmd *cmd,
|
|
u32 pdu_offset,
|
|
u32 pdu_length)
|
|
{
|
|
u32 r2t_length = 0, r2t_offset = 0;
|
|
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
|
|
&r2t_offset, &r2t_length) < 0)
|
|
return DATAOUT_CANNOT_RECOVER;
|
|
|
|
iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length);
|
|
|
|
return DATAOUT_WITHIN_COMMAND_RECOVERY;
|
|
}
|
|
|
|
static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void)
|
|
{
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL;
|
|
|
|
ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC);
|
|
if (!ooo_cmdsn) {
|
|
pr_err("Unable to allocate memory for"
|
|
" struct iscsi_ooo_cmdsn.\n");
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(&ooo_cmdsn->ooo_list);
|
|
|
|
return ooo_cmdsn;
|
|
}
|
|
|
|
static int iscsit_attach_ooo_cmdsn(
|
|
struct iscsi_session *sess,
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn)
|
|
{
|
|
struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp;
|
|
|
|
lockdep_assert_held(&sess->cmdsn_mutex);
|
|
|
|
/*
|
|
* We attach the struct iscsi_ooo_cmdsn entry to the out of order
|
|
* list in increasing CmdSN order.
|
|
* This allows iscsi_execute_ooo_cmdsns() to detect any
|
|
* additional CmdSN holes while performing delayed execution.
|
|
*/
|
|
if (list_empty(&sess->sess_ooo_cmdsn_list))
|
|
list_add_tail(&ooo_cmdsn->ooo_list,
|
|
&sess->sess_ooo_cmdsn_list);
|
|
else {
|
|
ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
|
|
typeof(*ooo_tail), ooo_list);
|
|
/*
|
|
* CmdSN is greater than the tail of the list.
|
|
*/
|
|
if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn))
|
|
list_add_tail(&ooo_cmdsn->ooo_list,
|
|
&sess->sess_ooo_cmdsn_list);
|
|
else {
|
|
/*
|
|
* CmdSN is either lower than the head, or somewhere
|
|
* in the middle.
|
|
*/
|
|
list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list,
|
|
ooo_list) {
|
|
if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn))
|
|
continue;
|
|
|
|
/* Insert before this entry */
|
|
list_add(&ooo_cmdsn->ooo_list,
|
|
ooo_tmp->ooo_list.prev);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Removes an struct iscsi_ooo_cmdsn from a session's list,
|
|
* called with struct iscsi_session->cmdsn_mutex held.
|
|
*/
|
|
void iscsit_remove_ooo_cmdsn(
|
|
struct iscsi_session *sess,
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn)
|
|
{
|
|
list_del(&ooo_cmdsn->ooo_list);
|
|
kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
|
|
}
|
|
|
|
void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn;
|
|
struct iscsi_session *sess = conn->sess;
|
|
|
|
mutex_lock(&sess->cmdsn_mutex);
|
|
list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) {
|
|
if (ooo_cmdsn->cid != conn->cid)
|
|
continue;
|
|
|
|
ooo_cmdsn->cmd = NULL;
|
|
}
|
|
mutex_unlock(&sess->cmdsn_mutex);
|
|
}
|
|
|
|
int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
|
|
{
|
|
int ooo_count = 0;
|
|
struct iscsi_cmd *cmd = NULL;
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
|
|
|
|
lockdep_assert_held(&sess->cmdsn_mutex);
|
|
|
|
list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
|
|
&sess->sess_ooo_cmdsn_list, ooo_list) {
|
|
if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn)
|
|
continue;
|
|
|
|
if (!ooo_cmdsn->cmd) {
|
|
sess->exp_cmd_sn++;
|
|
iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
|
|
continue;
|
|
}
|
|
|
|
cmd = ooo_cmdsn->cmd;
|
|
cmd->i_state = cmd->deferred_i_state;
|
|
ooo_count++;
|
|
sess->exp_cmd_sn++;
|
|
pr_debug("Executing out of order CmdSN: 0x%08x,"
|
|
" incremented ExpCmdSN to 0x%08x.\n",
|
|
cmd->cmd_sn, sess->exp_cmd_sn);
|
|
|
|
iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
|
|
|
|
if (iscsit_execute_cmd(cmd, 1) < 0)
|
|
return -1;
|
|
|
|
continue;
|
|
}
|
|
|
|
return ooo_count;
|
|
}
|
|
|
|
/*
|
|
* Called either:
|
|
*
|
|
* 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns()
|
|
* or iscsi_check_received_cmdsn().
|
|
* 2. With no locks held directly from iscsi_handle_XXX_pdu() functions
|
|
* for immediate commands.
|
|
*/
|
|
int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
|
|
{
|
|
struct se_cmd *se_cmd = &cmd->se_cmd;
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
int lr = 0;
|
|
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
if (ooo)
|
|
cmd->cmd_flags &= ~ICF_OOO_CMDSN;
|
|
|
|
switch (cmd->iscsi_opcode) {
|
|
case ISCSI_OP_SCSI_CMD:
|
|
/*
|
|
* Go ahead and send the CHECK_CONDITION status for
|
|
* any SCSI CDB exceptions that may have occurred.
|
|
*/
|
|
if (cmd->sense_reason) {
|
|
if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) {
|
|
cmd->i_state = ISTATE_SEND_STATUS;
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
|
|
cmd->i_state);
|
|
return 0;
|
|
}
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
if (cmd->se_cmd.transport_state & CMD_T_ABORTED)
|
|
return 0;
|
|
return transport_send_check_condition_and_sense(se_cmd,
|
|
cmd->sense_reason, 0);
|
|
}
|
|
/*
|
|
* Special case for delayed CmdSN with Immediate
|
|
* Data and/or Unsolicited Data Out attached.
|
|
*/
|
|
if (cmd->immediate_data) {
|
|
if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
target_execute_cmd(&cmd->se_cmd);
|
|
return 0;
|
|
}
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
if (!(cmd->cmd_flags &
|
|
ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
|
|
if (cmd->se_cmd.transport_state & CMD_T_ABORTED)
|
|
return 0;
|
|
|
|
iscsit_set_dataout_sequence_values(cmd);
|
|
conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
|
|
}
|
|
return 0;
|
|
}
|
|
/*
|
|
* The default handler.
|
|
*/
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
if ((cmd->data_direction == DMA_TO_DEVICE) &&
|
|
!(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
|
|
if (cmd->se_cmd.transport_state & CMD_T_ABORTED)
|
|
return 0;
|
|
|
|
iscsit_set_unsolicited_dataout(cmd);
|
|
}
|
|
return transport_handle_cdb_direct(&cmd->se_cmd);
|
|
|
|
case ISCSI_OP_NOOP_OUT:
|
|
case ISCSI_OP_TEXT:
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
|
|
break;
|
|
case ISCSI_OP_SCSI_TMFUNC:
|
|
if (cmd->se_cmd.se_tmr_req->response) {
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
|
|
cmd->i_state);
|
|
return 0;
|
|
}
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
|
|
return transport_generic_handle_tmr(&cmd->se_cmd);
|
|
case ISCSI_OP_LOGOUT:
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
switch (cmd->logout_reason) {
|
|
case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
|
|
lr = iscsit_logout_closesession(cmd, cmd->conn);
|
|
break;
|
|
case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
|
|
lr = iscsit_logout_closeconnection(cmd, cmd->conn);
|
|
break;
|
|
case ISCSI_LOGOUT_REASON_RECOVERY:
|
|
lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn);
|
|
break;
|
|
default:
|
|
pr_err("Unknown iSCSI Logout Request Code:"
|
|
" 0x%02x\n", cmd->logout_reason);
|
|
return -1;
|
|
}
|
|
|
|
return lr;
|
|
default:
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
pr_err("Cannot perform out of order execution for"
|
|
" unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess)
|
|
{
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
|
|
|
|
mutex_lock(&sess->cmdsn_mutex);
|
|
list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
|
|
&sess->sess_ooo_cmdsn_list, ooo_list) {
|
|
|
|
list_del(&ooo_cmdsn->ooo_list);
|
|
kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
|
|
}
|
|
mutex_unlock(&sess->cmdsn_mutex);
|
|
}
|
|
|
|
int iscsit_handle_ooo_cmdsn(
|
|
struct iscsi_session *sess,
|
|
struct iscsi_cmd *cmd,
|
|
u32 cmdsn)
|
|
{
|
|
int batch = 0;
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL;
|
|
|
|
cmd->deferred_i_state = cmd->i_state;
|
|
cmd->i_state = ISTATE_DEFERRED_CMD;
|
|
cmd->cmd_flags |= ICF_OOO_CMDSN;
|
|
|
|
if (list_empty(&sess->sess_ooo_cmdsn_list))
|
|
batch = 1;
|
|
else {
|
|
ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
|
|
typeof(*ooo_tail), ooo_list);
|
|
if (ooo_tail->cmdsn != (cmdsn - 1))
|
|
batch = 1;
|
|
}
|
|
|
|
ooo_cmdsn = iscsit_allocate_ooo_cmdsn();
|
|
if (!ooo_cmdsn)
|
|
return -ENOMEM;
|
|
|
|
ooo_cmdsn->cmd = cmd;
|
|
ooo_cmdsn->batch_count = (batch) ?
|
|
(cmdsn - sess->exp_cmd_sn) : 1;
|
|
ooo_cmdsn->cid = cmd->conn->cid;
|
|
ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn;
|
|
ooo_cmdsn->cmdsn = cmdsn;
|
|
|
|
if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) {
|
|
kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int iscsit_set_dataout_timeout_values(
|
|
struct iscsi_cmd *cmd,
|
|
u32 *offset,
|
|
u32 *length)
|
|
{
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct iscsi_r2t *r2t;
|
|
|
|
if (cmd->unsolicited_data) {
|
|
*offset = 0;
|
|
*length = (conn->sess->sess_ops->FirstBurstLength >
|
|
cmd->se_cmd.data_length) ?
|
|
cmd->se_cmd.data_length :
|
|
conn->sess->sess_ops->FirstBurstLength;
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_bh(&cmd->r2t_lock);
|
|
if (list_empty(&cmd->cmd_r2t_list)) {
|
|
pr_err("cmd->cmd_r2t_list is empty!\n");
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
return -1;
|
|
}
|
|
|
|
list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
|
|
if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) {
|
|
*offset = r2t->offset;
|
|
*length = r2t->xfer_len;
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
return 0;
|
|
}
|
|
}
|
|
spin_unlock_bh(&cmd->r2t_lock);
|
|
|
|
pr_err("Unable to locate any incomplete DataOUT"
|
|
" sequences for ITT: 0x%08x.\n", cmd->init_task_tag);
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* NOTE: Called from interrupt (timer) context.
|
|
*/
|
|
void iscsit_handle_dataout_timeout(struct timer_list *t)
|
|
{
|
|
u32 pdu_length = 0, pdu_offset = 0;
|
|
u32 r2t_length = 0, r2t_offset = 0;
|
|
struct iscsi_cmd *cmd = from_timer(cmd, t, dataout_timer);
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct iscsi_session *sess = NULL;
|
|
struct iscsi_node_attrib *na;
|
|
|
|
iscsit_inc_conn_usage_count(conn);
|
|
|
|
spin_lock_bh(&cmd->dataout_timeout_lock);
|
|
if (cmd->dataout_timer_flags & ISCSI_TF_STOP) {
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
iscsit_dec_conn_usage_count(conn);
|
|
return;
|
|
}
|
|
cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
|
|
sess = conn->sess;
|
|
na = iscsit_tpg_get_node_attrib(sess);
|
|
|
|
if (!sess->sess_ops->ErrorRecoveryLevel) {
|
|
pr_err("Unable to recover from DataOut timeout while"
|
|
" in ERL=0, closing iSCSI connection for I_T Nexus"
|
|
" %s,i,0x%6phN,%s,t,0x%02x\n",
|
|
sess->sess_ops->InitiatorName, sess->isid,
|
|
sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
|
|
goto failure;
|
|
}
|
|
|
|
if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) {
|
|
pr_err("Command ITT: 0x%08x exceeded max retries"
|
|
" for DataOUT timeout %u, closing iSCSI connection for"
|
|
" I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
|
|
cmd->init_task_tag, na->dataout_timeout_retries,
|
|
sess->sess_ops->InitiatorName, sess->isid,
|
|
sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
|
|
goto failure;
|
|
}
|
|
|
|
cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
|
|
|
|
if (conn->sess->sess_ops->DataSequenceInOrder) {
|
|
if (conn->sess->sess_ops->DataPDUInOrder) {
|
|
pdu_offset = cmd->write_data_done;
|
|
if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength -
|
|
cmd->next_burst_len)) > cmd->se_cmd.data_length)
|
|
pdu_length = (cmd->se_cmd.data_length -
|
|
cmd->write_data_done);
|
|
else
|
|
pdu_length = (conn->sess->sess_ops->MaxBurstLength -
|
|
cmd->next_burst_len);
|
|
} else {
|
|
pdu_offset = cmd->seq_start_offset;
|
|
pdu_length = (cmd->seq_end_offset -
|
|
cmd->seq_start_offset);
|
|
}
|
|
} else {
|
|
if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset,
|
|
&pdu_length) < 0)
|
|
goto failure;
|
|
}
|
|
|
|
if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
|
|
&r2t_offset, &r2t_length) < 0)
|
|
goto failure;
|
|
|
|
pr_debug("Command ITT: 0x%08x timed out waiting for"
|
|
" completion of %sDataOUT Sequence Offset: %u, Length: %u\n",
|
|
cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " :
|
|
"", r2t_offset, r2t_length);
|
|
|
|
if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0)
|
|
goto failure;
|
|
|
|
iscsit_start_dataout_timer(cmd, conn);
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
iscsit_dec_conn_usage_count(conn);
|
|
|
|
return;
|
|
|
|
failure:
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
iscsit_fill_cxn_timeout_err_stats(sess);
|
|
iscsit_cause_connection_reinstatement(conn, 0);
|
|
iscsit_dec_conn_usage_count(conn);
|
|
}
|
|
|
|
void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd)
|
|
{
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct iscsi_session *sess = conn->sess;
|
|
struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
|
|
|
|
spin_lock_bh(&cmd->dataout_timeout_lock);
|
|
if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
return;
|
|
}
|
|
|
|
mod_timer(&cmd->dataout_timer,
|
|
(get_jiffies_64() + na->dataout_timeout * HZ));
|
|
pr_debug("Updated DataOUT timer for ITT: 0x%08x",
|
|
cmd->init_task_tag);
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
}
|
|
|
|
void iscsit_start_dataout_timer(
|
|
struct iscsi_cmd *cmd,
|
|
struct iscsi_conn *conn)
|
|
{
|
|
struct iscsi_session *sess = conn->sess;
|
|
struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
|
|
|
|
lockdep_assert_held(&cmd->dataout_timeout_lock);
|
|
|
|
if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING)
|
|
return;
|
|
|
|
pr_debug("Starting DataOUT timer for ITT: 0x%08x on"
|
|
" CID: %hu.\n", cmd->init_task_tag, conn->cid);
|
|
|
|
cmd->dataout_timer_flags &= ~ISCSI_TF_STOP;
|
|
cmd->dataout_timer_flags |= ISCSI_TF_RUNNING;
|
|
mod_timer(&cmd->dataout_timer, jiffies + na->dataout_timeout * HZ);
|
|
}
|
|
|
|
void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd)
|
|
{
|
|
spin_lock_bh(&cmd->dataout_timeout_lock);
|
|
if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
return;
|
|
}
|
|
cmd->dataout_timer_flags |= ISCSI_TF_STOP;
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
|
|
del_timer_sync(&cmd->dataout_timer);
|
|
|
|
spin_lock_bh(&cmd->dataout_timeout_lock);
|
|
cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
|
|
pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n",
|
|
cmd->init_task_tag);
|
|
spin_unlock_bh(&cmd->dataout_timeout_lock);
|
|
}
|
|
EXPORT_SYMBOL(iscsit_stop_dataout_timer);
|