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![Bart Van Assche](/assets/img/avatar_default.png)
Remove superfluous #include directives from the include/target/*.h files. Add missing #include directives to other *.h and *.c files. Use forward declarations for structures where possible. This change reduces the build time for make M=drivers/target on my laptop from 27.1s to 18.7s or by about 30%. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
1294 lines
33 KiB
C
1294 lines
33 KiB
C
/*******************************************************************************
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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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* 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 <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 32768
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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, pad_bytes[4];
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int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
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u32 length, padding, 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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length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
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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 = ((offset + length) > buf_len) ?
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(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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goto out;
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}
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offset += size;
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}
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if (!dump_padding_digest)
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goto out;
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padding = ((-buf_len) & 3);
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if (padding != 0) {
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iov.iov_len = padding;
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iov.iov_base = pad_bytes;
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rx_got = rx_data(conn, &iov, 1, padding);
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if (rx_got != padding) {
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ret = DATAOUT_CANNOT_RECOVER;
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goto out;
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}
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}
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if (conn->conn_ops->DataDigest) {
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u32 data_crc;
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iov.iov_len = ISCSI_CRC_LEN;
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iov.iov_base = &data_crc;
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rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
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if (rx_got != ISCSI_CRC_LEN) {
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ret = DATAOUT_CANNOT_RECOVER;
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goto out;
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}
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}
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out:
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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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/*
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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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/*
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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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|
|
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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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|
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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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|
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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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|
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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.
|
|
*/
|
|
switch (cmd->data_direction) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Called with sess->cmdsn_mutex held.
|
|
*/
|
|
static int iscsit_attach_ooo_cmdsn(
|
|
struct iscsi_session *sess,
|
|
struct iscsi_ooo_cmdsn *ooo_cmdsn)
|
|
{
|
|
struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp;
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Called with sess->cmdsn_mutex held.
|
|
*/
|
|
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;
|
|
|
|
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);
|
|
/*
|
|
* Determine if delayed TASK_ABORTED status for WRITEs
|
|
* should be sent now if no unsolicited data out
|
|
* payloads are expected, or if the delayed status
|
|
* should be sent after unsolicited data out with
|
|
* ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out()
|
|
*/
|
|
if (transport_check_aborted_status(se_cmd,
|
|
(cmd->unsolicited_data == 0)) != 0)
|
|
return 0;
|
|
/*
|
|
* Otherwise send CHECK_CONDITION and sense for
|
|
* exception
|
|
*/
|
|
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)) {
|
|
/*
|
|
* Send the delayed TASK_ABORTED status for
|
|
* WRITEs if no more unsolicitied data is
|
|
* expected.
|
|
*/
|
|
if (transport_check_aborted_status(se_cmd, 1)
|
|
!= 0)
|
|
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)) {
|
|
/*
|
|
* Send the delayed TASK_ABORTED status for WRITEs if
|
|
* no more nsolicitied data is expected.
|
|
*/
|
|
if (transport_check_aborted_status(se_cmd, 1) != 0)
|
|
return 0;
|
|
|
|
iscsit_set_unsoliticed_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.
|
|
*/
|
|
static void iscsit_handle_dataout_timeout(unsigned long data)
|
|
{
|
|
u32 pdu_length = 0, pdu_offset = 0;
|
|
u32 r2t_length = 0, r2t_offset = 0;
|
|
struct iscsi_cmd *cmd = (struct iscsi_cmd *) data;
|
|
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_debug("Unable to recover from DataOut timeout while"
|
|
" in ERL=0.\n");
|
|
goto failure;
|
|
}
|
|
|
|
if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) {
|
|
pr_debug("Command ITT: 0x%08x exceeded max retries"
|
|
" for DataOUT timeout %u, closing iSCSI connection.\n",
|
|
cmd->init_task_tag, na->dataout_timeout_retries);
|
|
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_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);
|
|
}
|
|
|
|
/*
|
|
* Called with cmd->dataout_timeout_lock held.
|
|
*/
|
|
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);
|
|
|
|
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);
|
|
|
|
init_timer(&cmd->dataout_timer);
|
|
cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ);
|
|
cmd->dataout_timer.data = (unsigned long)cmd;
|
|
cmd->dataout_timer.function = iscsit_handle_dataout_timeout;
|
|
cmd->dataout_timer_flags &= ~ISCSI_TF_STOP;
|
|
cmd->dataout_timer_flags |= ISCSI_TF_RUNNING;
|
|
add_timer(&cmd->dataout_timer);
|
|
}
|
|
|
|
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);
|