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    Subject[PATCH-v3 13/14] iscsi-target: Add misc utility and debug logic
    Date
    From: Nicholas Bellinger <nab@linux-iscsi.org>

    This file adds iscsi_target_util.[c,h] code containing a number
    of miscellaneous utility functions for iscsi_target_mod.

    It also contains iscsi_debug.h macros for CONFIG_ISCSI_TARGET_DEBUG

    Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
    ---
    drivers/target/iscsi/iscsi_target_debug.h | 113 ++
    drivers/target/iscsi/iscsi_target_util.c | 1890 +++++++++++++++++++++++++++++
    drivers/target/iscsi/iscsi_target_util.h | 98 ++
    3 files changed, 2101 insertions(+), 0 deletions(-)
    create mode 100644 drivers/target/iscsi/iscsi_target_debug.h
    create mode 100644 drivers/target/iscsi/iscsi_target_util.c
    create mode 100644 drivers/target/iscsi/iscsi_target_util.h

    diff --git a/drivers/target/iscsi/iscsi_target_debug.h b/drivers/target/iscsi/iscsi_target_debug.h
    new file mode 100644
    index 0000000..1356146
    --- /dev/null
    +++ b/drivers/target/iscsi/iscsi_target_debug.h
    @@ -0,0 +1,113 @@
    +#ifndef ISCSI_DEBUG_H
    +#define ISCSI_DEBUG_H
    +
    +/*
    + * Debugging Support
    + */
    +
    +#define TRACE_DEBUG 0x00000001 /* Verbose debugging */
    +#define TRACE_SCSI 0x00000002 /* Stuff related to SCSI Mid-layer */
    +#define TRACE_ISCSI 0x00000004 /* Stuff related to iSCSI */
    +#define TRACE_NET 0x00000008 /* Stuff related to network code */
    +#define TRACE_BUFF 0x00000010 /* For dumping raw data */
    +#define TRACE_FILE 0x00000020 /* Used for __FILE__ */
    +#define TRACE_LINE 0x00000040 /* Used for __LINE__ */
    +#define TRACE_FUNCTION 0x00000080 /* Used for __FUNCTION__ */
    +#define TRACE_SEM 0x00000100 /* Stuff related to semaphores */
    +#define TRACE_ENTER_LEAVE 0x00000200 /* For entering/leaving functions */
    +#define TRACE_DIGEST 0x00000400 /* For Header/Data Digests */
    +#define TRACE_PARAM 0x00000800 /* For parameters in parameters.c */
    +#define TRACE_LOGIN 0x00001000 /* For login related code */
    +#define TRACE_STATE 0x00002000 /* For conn/sess/cleanup states */
    +#define TRACE_ERL0 0x00004000 /* For ErrorRecoveryLevel=0 */
    +#define TRACE_ERL1 0x00008000 /* For ErrorRecoveryLevel=1 */
    +#define TRACE_ERL2 0x00010000 /* For ErrorRecoveryLevel=2 */
    +#define TRACE_TIMER 0x00020000 /* For various ERL timers */
    +#define TRACE_R2T 0x00040000 /* For R2T callers */
    +#define TRACE_SPINDLE 0x00080000 /* For Spindle callers */
    +#define TRACE_SSLR 0x00100000 /* For SyncNSteering RX */
    +#define TRACE_SSLT 0x00200000 /* For SyncNSteering TX */
    +#define TRACE_CHANNEL 0x00400000 /* For SCSI Channels */
    +#define TRACE_CMDSN 0x00800000 /* For Out of Order CmdSN execution */
    +#define TRACE_NODEATTRIB 0x01000000 /* For Initiator Nodes */
    +
    +#define TRACE_VANITY 0x80000000 /* For all Vanity Noise */
    +#define TRACE_ALL 0xffffffff /* Turn on all flags */
    +#define TRACE_ENDING 0x00000000 /* foo */
    +
    +#ifdef CONFIG_ISCSI_TARGET_DEBUG
    +/*
    + * TRACE_VANITY, is always last!
    + */
    +static unsigned int iscsi_trace =
    +/* TRACE_DEBUG | */
    +/* TRACE_SCSI | */
    +/* TRACE_ISCSI | */
    +/* TRACE_NET | */
    +/* TRACE_BUFF | */
    +/* TRACE_FILE | */
    +/* TRACE_LINE | */
    +/* TRACE_FUNCTION | */
    +/* TRACE_SEM | */
    +
    +/* TRACE_DIGEST | */
    +/* TRACE_PARAM | */
    +/* TRACE_LOGIN | */
    +/* TRACE_STATE | */
    + TRACE_ERL0 |
    + TRACE_ERL1 |
    + TRACE_ERL2 |
    +/* TRACE_TIMER | */
    +/* TRACE_R2T | */
    +/* TRACE_SPINDLE | */
    +/* TRACE_SSLR | */
    +/* TRACE_SSLT | */
    +/* TRACE_CHANNEL | */
    +/* TRACE_CMDSN | */
    +/* TRACE_NODEATTRIB | */
    + TRACE_VANITY |
    + TRACE_ENDING;
    +
    +#define TRACE(trace, args...) \
    +{ \
    +static char iscsi_trace_buff[256]; \
    + \
    +if (iscsi_trace & trace) { \
    + sprintf(iscsi_trace_buff, args); \
    + if (iscsi_trace & TRACE_FUNCTION) { \
    + printk(KERN_INFO "%s:%d: %s", __func__, __LINE__, \
    + iscsi_trace_buff); \
    + } else if (iscsi_trace&TRACE_FILE) { \
    + printk(KERN_INFO "%s::%d: %s", __FILE__, __LINE__, \
    + iscsi_trace_buff); \
    + } else if (iscsi_trace & TRACE_LINE) { \
    + printk(KERN_INFO "%d: %s", __LINE__, iscsi_trace_buff); \
    + } else { \
    + printk(KERN_INFO "%s", iscsi_trace_buff); \
    + } \
    +} \
    +}
    +
    +#define PRINT_BUFF(buff, len) \
    +if (iscsi_trace & TRACE_BUFF) { \
    + int zzz; \
    + \
    + printk(KERN_INFO "%d:\n", __LINE__); \
    + for (zzz = 0; zzz < len; zzz++) { \
    + if (zzz % 16 == 0) { \
    + if (zzz) \
    + printk(KERN_INFO "\n"); \
    + printk(KERN_INFO "%4i: ", zzz); \
    + } \
    + printk(KERN_INFO "%02x ", (unsigned char) (buff)[zzz]); \
    + } \
    + if ((len + 1) % 16) \
    + printk(KERN_INFO "\n"); \
    +}
    +
    +#else /* !CONFIG_ISCSI_TARGET_DEBUG */
    +#define TRACE(trace, args...)
    +#define PRINT_BUFF(buff, len)
    +#endif /* CONFIG_ISCSI_TARGET_DEBUG */
    +
    +#endif /*** ISCSI_DEBUG_H ***/
    diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
    new file mode 100644
    index 0000000..af1c5c44
    --- /dev/null
    +++ b/drivers/target/iscsi/iscsi_target_util.c
    @@ -0,0 +1,1890 @@
    +/*******************************************************************************
    + * This file contains the iSCSI Target specific utility functions.
    + *
    + * © Copyright 2007-2011 RisingTide Systems LLC.
    + *
    + * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
    + *
    + * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
    + *
    + * 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.
    + ******************************************************************************/
    +
    +#include <linux/list.h>
    +#include <scsi/libsas.h> /* For TASK_ATTR_* */
    +#include <scsi/iscsi_proto.h>
    +#include <target/target_core_base.h>
    +#include <target/target_core_transport.h>
    +#include <target/target_core_tmr.h>
    +#include <target/target_core_fabric_ops.h>
    +#include <target/target_core_configfs.h>
    +
    +#include "iscsi_target_debug.h"
    +#include "iscsi_target_core.h"
    +#include "iscsi_target_parameters.h"
    +#include "iscsi_target_seq_pdu_list.h"
    +#include "iscsi_target_datain_values.h"
    +#include "iscsi_target_erl0.h"
    +#include "iscsi_target_erl1.h"
    +#include "iscsi_target_erl2.h"
    +#include "iscsi_target_tpg.h"
    +#include "iscsi_target_tq.h"
    +#include "iscsi_target_util.h"
    +#include "iscsi_target.h"
    +
    +extern struct list_head g_tiqn_list;
    +extern spinlock_t tiqn_lock;
    +
    +/*
    + * Called with cmd->r2t_lock held.
    + */
    +int iscsit_add_r2t_to_list(
    + struct iscsi_cmd *cmd,
    + u32 offset,
    + u32 xfer_len,
    + int recovery,
    + u32 r2t_sn)
    +{
    + struct iscsi_r2t *r2t;
    +
    + r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
    + if (!r2t) {
    + printk(KERN_ERR "Unable to allocate memory for struct iscsi_r2t.\n");
    + return -1;
    + }
    + INIT_LIST_HEAD(&r2t->r2t_list);
    +
    + r2t->recovery_r2t = recovery;
    + r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
    + r2t->offset = offset;
    + r2t->xfer_len = xfer_len;
    + list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
    + spin_unlock_bh(&cmd->r2t_lock);
    +
    + iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
    +
    + spin_lock_bh(&cmd->r2t_lock);
    + return 0;
    +}
    +
    +struct iscsi_r2t *iscsit_get_r2t_for_eos(
    + struct iscsi_cmd *cmd,
    + u32 offset,
    + u32 length)
    +{
    + struct iscsi_r2t *r2t;
    +
    + spin_lock_bh(&cmd->r2t_lock);
    + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
    + if ((r2t->offset <= offset) &&
    + (r2t->offset + r2t->xfer_len) >= (offset + length))
    + break;
    + }
    + spin_unlock_bh(&cmd->r2t_lock);
    +
    + if (!r2t) {
    + printk(KERN_ERR "Unable to locate R2T for Offset: %u, Length:"
    + " %u\n", offset, length);
    + return NULL;
    + }
    +
    + return r2t;
    +}
    +
    +struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
    +{
    + struct iscsi_r2t *r2t;
    +
    + spin_lock_bh(&cmd->r2t_lock);
    + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
    + if (!r2t->sent_r2t)
    + break;
    + }
    + spin_unlock_bh(&cmd->r2t_lock);
    +
    + if (!r2t) {
    + printk(KERN_ERR "Unable to locate next R2T to send for ITT:"
    + " 0x%08x.\n", cmd->init_task_tag);
    + return NULL;
    + }
    +
    + return r2t;
    +}
    +
    +/*
    + * Called with cmd->r2t_lock held.
    + */
    +void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
    +{
    + list_del(&r2t->r2t_list);
    + kmem_cache_free(lio_r2t_cache, r2t);
    +}
    +
    +void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
    +{
    + struct iscsi_r2t *r2t, *r2t_tmp;
    +
    + spin_lock_bh(&cmd->r2t_lock);
    + list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
    + iscsit_free_r2t(r2t, cmd);
    + spin_unlock_bh(&cmd->r2t_lock);
    +}
    +
    +/*
    + * May be called from software interrupt (timer) context for allocating
    + * iSCSI NopINs.
    + */
    +struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
    +{
    + struct iscsi_cmd *cmd;
    +
    + cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
    + if (!cmd) {
    + printk(KERN_ERR "Unable to allocate memory for struct iscsi_cmd.\n");
    + return NULL;
    + }
    +
    + cmd->conn = conn;
    + INIT_LIST_HEAD(&cmd->i_list);
    + INIT_LIST_HEAD(&cmd->datain_list);
    + INIT_LIST_HEAD(&cmd->cmd_r2t_list);
    + init_completion(&cmd->reject_comp);
    + init_completion(&cmd->unsolicited_data_comp);
    + spin_lock_init(&cmd->datain_lock);
    + spin_lock_init(&cmd->dataout_timeout_lock);
    + spin_lock_init(&cmd->istate_lock);
    + spin_lock_init(&cmd->error_lock);
    + spin_lock_init(&cmd->r2t_lock);
    +
    + return cmd;
    +}
    +
    +/*
    + * Called from iscsi_handle_scsi_cmd()
    + */
    +struct iscsi_cmd *iscsit_allocate_se_cmd(
    + struct iscsi_conn *conn,
    + u32 data_length,
    + int data_direction,
    + int iscsi_task_attr)
    +{
    + struct iscsi_cmd *cmd;
    + struct se_cmd *se_cmd;
    + int sam_task_attr;
    +
    + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
    + if (!cmd)
    + return NULL;
    +
    + cmd->data_direction = data_direction;
    + cmd->data_length = data_length;
    + /*
    + * Figure out the SAM Task Attribute for the incoming SCSI CDB
    + */
    + if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
    + (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
    + sam_task_attr = TASK_ATTR_SIMPLE;
    + else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
    + sam_task_attr = TASK_ATTR_ORDERED;
    + else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
    + sam_task_attr = TASK_ATTR_HOQ;
    + else if (iscsi_task_attr == ISCSI_ATTR_ACA)
    + sam_task_attr = TASK_ATTR_ACA;
    + else {
    + printk(KERN_INFO "Unknown iSCSI Task Attribute: 0x%02x, using"
    + " TASK_ATTR_SIMPLE\n", iscsi_task_attr);
    + sam_task_attr = TASK_ATTR_SIMPLE;
    + }
    +
    + se_cmd = &cmd->se_cmd;
    + /*
    + * Initialize struct se_cmd descriptor from target_core_mod infrastructure
    + */
    + transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
    + conn->sess->se_sess, data_length, data_direction,
    + sam_task_attr, &cmd->sense_buffer[0]);
    + return cmd;
    +}
    +
    +struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
    + struct iscsi_conn *conn,
    + u8 function)
    +{
    + struct iscsi_cmd *cmd;
    + struct se_cmd *se_cmd;
    + u8 tcm_function;
    +
    + cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
    + if (!cmd)
    + return NULL;
    +
    + cmd->data_direction = DMA_NONE;
    +
    + cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
    + if (!cmd->tmr_req) {
    + printk(KERN_ERR "Unable to allocate memory for"
    + " Task Management command!\n");
    + return NULL;
    + }
    + /*
    + * TASK_REASSIGN for ERL=2 / connection stays inside of
    + * LIO-Target $FABRIC_MOD
    + */
    + if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
    + return cmd;
    +
    + se_cmd = &cmd->se_cmd;
    + /*
    + * Initialize struct se_cmd descriptor from target_core_mod infrastructure
    + */
    + transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
    + conn->sess->se_sess, 0, DMA_NONE,
    + TASK_ATTR_SIMPLE, &cmd->sense_buffer[0]);
    +
    + switch (function) {
    + case ISCSI_TM_FUNC_ABORT_TASK:
    + tcm_function = TMR_ABORT_TASK;
    + break;
    + case ISCSI_TM_FUNC_ABORT_TASK_SET:
    + tcm_function = TMR_ABORT_TASK_SET;
    + break;
    + case ISCSI_TM_FUNC_CLEAR_ACA:
    + tcm_function = TMR_CLEAR_ACA;
    + break;
    + case ISCSI_TM_FUNC_CLEAR_TASK_SET:
    + tcm_function = TMR_CLEAR_TASK_SET;
    + break;
    + case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
    + tcm_function = TMR_LUN_RESET;
    + break;
    + case ISCSI_TM_FUNC_TARGET_WARM_RESET:
    + tcm_function = TMR_TARGET_WARM_RESET;
    + break;
    + case ISCSI_TM_FUNC_TARGET_COLD_RESET:
    + tcm_function = TMR_TARGET_COLD_RESET;
    + break;
    + default:
    + printk(KERN_ERR "Unknown iSCSI TMR Function:"
    + " 0x%02x\n", function);
    + goto out;
    + }
    +
    + se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
    + (void *)cmd->tmr_req, tcm_function);
    + if (!se_cmd->se_tmr_req)
    + goto out;
    +
    + cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
    +
    + return cmd;
    +out:
    + iscsit_release_cmd(cmd);
    + if (se_cmd)
    + transport_free_se_cmd(se_cmd);
    + return NULL;
    +}
    +
    +int iscsit_decide_list_to_build(
    + struct iscsi_cmd *cmd,
    + u32 immediate_data_length)
    +{
    + struct iscsi_build_list bl;
    + struct iscsi_conn *conn = cmd->conn;
    + struct iscsi_session *sess = conn->sess;
    + struct iscsi_node_attrib *na;
    +
    + if (sess->sess_ops->DataSequenceInOrder &&
    + sess->sess_ops->DataPDUInOrder)
    + return 0;
    +
    + if (cmd->data_direction == DMA_NONE)
    + return 0;
    +
    + na = iscsit_tpg_get_node_attrib(sess);
    + memset(&bl, 0, sizeof(struct iscsi_build_list));
    +
    + if (cmd->data_direction == DMA_FROM_DEVICE) {
    + bl.data_direction = ISCSI_PDU_READ;
    + bl.type = PDULIST_NORMAL;
    + if (na->random_datain_pdu_offsets)
    + bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
    + if (na->random_datain_seq_offsets)
    + bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
    + } else {
    + bl.data_direction = ISCSI_PDU_WRITE;
    + bl.immediate_data_length = immediate_data_length;
    + if (na->random_r2t_offsets)
    + bl.randomize |= RANDOM_R2T_OFFSETS;
    +
    + if (!cmd->immediate_data && !cmd->unsolicited_data)
    + bl.type = PDULIST_NORMAL;
    + else if (cmd->immediate_data && !cmd->unsolicited_data)
    + bl.type = PDULIST_IMMEDIATE;
    + else if (!cmd->immediate_data && cmd->unsolicited_data)
    + bl.type = PDULIST_UNSOLICITED;
    + else if (cmd->immediate_data && cmd->unsolicited_data)
    + bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
    + }
    +
    + return iscsit_do_build_list(cmd, &bl);
    +}
    +
    +struct iscsi_seq *iscsit_get_seq_holder_for_datain(
    + struct iscsi_cmd *cmd,
    + u32 seq_send_order)
    +{
    + u32 i;
    +
    + for (i = 0; i < cmd->seq_count; i++)
    + if (cmd->seq_list[i].seq_send_order == seq_send_order)
    + return &cmd->seq_list[i];
    +
    + return NULL;
    +}
    +
    +struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
    +{
    + u32 i;
    +
    + if (!cmd->seq_list) {
    + printk(KERN_ERR "struct iscsi_cmd->seq_list is NULL!\n");
    + return NULL;
    + }
    +
    + for (i = 0; i < cmd->seq_count; i++) {
    + if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
    + continue;
    + if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
    + cmd->seq_send_order++;
    + return &cmd->seq_list[i];
    + }
    + }
    +
    + return NULL;
    +}
    +
    +struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
    + struct iscsi_cmd *cmd,
    + u32 r2t_sn)
    +{
    + struct iscsi_r2t *r2t;
    +
    + spin_lock_bh(&cmd->r2t_lock);
    + list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
    + if (r2t->r2t_sn == r2t_sn) {
    + spin_unlock_bh(&cmd->r2t_lock);
    + return r2t;
    + }
    + }
    + spin_unlock_bh(&cmd->r2t_lock);
    +
    + return NULL;
    +}
    +
    +inline int iscsit_check_received_cmdsn(
    + struct iscsi_conn *conn,
    + struct iscsi_cmd *cmd,
    + u32 cmdsn)
    +{
    + int ret;
    + /*
    + * This is the proper method of checking received CmdSN against
    + * ExpCmdSN and MaxCmdSN values, as well as accounting for out
    + * or order CmdSNs due to multiple connection sessions and/or
    + * CRC failures.
    + */
    + spin_lock(&conn->sess->cmdsn_lock);
    + if (iscsi_sna_gt(cmdsn, conn->sess->max_cmd_sn)) {
    + printk(KERN_ERR "Received CmdSN: 0x%08x is greater than"
    + " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
    + conn->sess->max_cmd_sn);
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_ERROR_CANNOT_RECOVER;
    + }
    +
    + if (!conn->sess->cmdsn_outoforder) {
    + if (cmdsn == conn->sess->exp_cmd_sn) {
    + conn->sess->exp_cmd_sn++;
    + TRACE(TRACE_CMDSN, "Received CmdSN matches ExpCmdSN,"
    + " incremented ExpCmdSN to: 0x%08x\n",
    + conn->sess->exp_cmd_sn);
    + ret = iscsit_execute_cmd(cmd, 0);
    + spin_unlock(&conn->sess->cmdsn_lock);
    +
    + return (!ret) ? CMDSN_NORMAL_OPERATION :
    + CMDSN_ERROR_CANNOT_RECOVER;
    + } else if (iscsi_sna_gt(cmdsn, conn->sess->exp_cmd_sn)) {
    + TRACE(TRACE_CMDSN, "Received CmdSN: 0x%08x is greater"
    + " than ExpCmdSN: 0x%08x, not acknowledging.\n",
    + cmdsn, conn->sess->exp_cmd_sn);
    + goto ooo_cmdsn;
    + } else {
    + printk(KERN_ERR "Received CmdSN: 0x%08x is less than"
    + " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
    + conn->sess->exp_cmd_sn);
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_LOWER_THAN_EXP;
    + }
    + } else {
    + int counter = 0;
    + u32 old_expcmdsn = 0;
    + if (cmdsn == conn->sess->exp_cmd_sn) {
    + old_expcmdsn = conn->sess->exp_cmd_sn++;
    + TRACE(TRACE_CMDSN, "Got missing CmdSN: 0x%08x matches"
    + " ExpCmdSN, incremented ExpCmdSN to 0x%08x.\n",
    + cmdsn, conn->sess->exp_cmd_sn);
    +
    + if (iscsit_execute_cmd(cmd, 0) < 0) {
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_ERROR_CANNOT_RECOVER;
    + }
    + } else if (iscsi_sna_gt(cmdsn, conn->sess->exp_cmd_sn)) {
    + TRACE(TRACE_CMDSN, "CmdSN: 0x%08x greater than"
    + " ExpCmdSN: 0x%08x, not acknowledging.\n",
    + cmdsn, conn->sess->exp_cmd_sn);
    + goto ooo_cmdsn;
    + } else {
    + printk(KERN_ERR "CmdSN: 0x%08x less than ExpCmdSN:"
    + " 0x%08x, ignoring.\n", cmdsn,
    + conn->sess->exp_cmd_sn);
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_LOWER_THAN_EXP;
    + }
    +
    + counter = iscsit_execute_ooo_cmdsns(conn->sess);
    + if (counter < 0) {
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_ERROR_CANNOT_RECOVER;
    + }
    +
    + if (counter == conn->sess->ooo_cmdsn_count) {
    + if (conn->sess->ooo_cmdsn_count == 1) {
    + TRACE(TRACE_CMDSN, "Received final missing"
    + " CmdSN: 0x%08x.\n", old_expcmdsn);
    + } else {
    + TRACE(TRACE_CMDSN, "Received final missing"
    + " CmdSNs: 0x%08x->0x%08x.\n",
    + old_expcmdsn, (conn->sess->exp_cmd_sn - 1));
    + }
    +
    + conn->sess->ooo_cmdsn_count = 0;
    + conn->sess->cmdsn_outoforder = 0;
    + } else {
    + conn->sess->ooo_cmdsn_count -= counter;
    + TRACE(TRACE_CMDSN, "Still missing %hu CmdSN(s),"
    + " continuing out of order operation.\n",
    + conn->sess->ooo_cmdsn_count);
    + }
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return CMDSN_NORMAL_OPERATION;
    + }
    +
    +ooo_cmdsn:
    + ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
    + spin_unlock(&conn->sess->cmdsn_lock);
    + return ret;
    +}
    +
    +int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
    +{
    + struct iscsi_conn *conn = cmd->conn;
    + struct se_cmd *se_cmd = SE_CMD(cmd);
    + struct iscsi_data *hdr = (struct iscsi_data *) buf;
    + u32 payload_length = ntoh24(hdr->dlength);
    +
    + if (conn->sess->sess_ops->InitialR2T) {
    + printk(KERN_ERR "Received unexpected unsolicited data"
    + " while InitialR2T=Yes, protocol error.\n");
    + transport_send_check_condition_and_sense(se_cmd,
    + TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
    + return -1;
    + }
    +
    + if ((cmd->first_burst_len + payload_length) >
    + conn->sess->sess_ops->FirstBurstLength) {
    + printk(KERN_ERR "Total %u bytes exceeds FirstBurstLength: %u"
    + " for this Unsolicited DataOut Burst.\n",
    + (cmd->first_burst_len + payload_length),
    + conn->sess->sess_ops->FirstBurstLength);
    + transport_send_check_condition_and_sense(se_cmd,
    + TCM_INCORRECT_AMOUNT_OF_DATA, 0);
    + return -1;
    + }
    +
    + if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
    + return 0;
    +
    + if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
    + ((cmd->first_burst_len + payload_length) !=
    + conn->sess->sess_ops->FirstBurstLength)) {
    + printk(KERN_ERR "Unsolicited non-immediate data received %u"
    + " does not equal FirstBurstLength: %u, and does"
    + " not equal ExpXferLen %u.\n",
    + (cmd->first_burst_len + payload_length),
    + conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
    + transport_send_check_condition_and_sense(se_cmd,
    + TCM_INCORRECT_AMOUNT_OF_DATA, 0);
    + return -1;
    + }
    + return 0;
    +}
    +
    +struct iscsi_cmd *iscsit_find_cmd_from_itt(
    + struct iscsi_conn *conn,
    + u32 init_task_tag)
    +{
    + struct iscsi_cmd *cmd;
    +
    + spin_lock_bh(&conn->cmd_lock);
    + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
    + if (cmd->init_task_tag == init_task_tag)
    + break;
    + }
    + spin_unlock_bh(&conn->cmd_lock);
    +
    + if (!cmd) {
    + printk(KERN_ERR "Unable to locate ITT: 0x%08x on CID: %hu",
    + init_task_tag, conn->cid);
    + return NULL;
    + }
    +
    + return cmd;
    +}
    +
    +struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
    + struct iscsi_conn *conn,
    + u32 init_task_tag,
    + u32 length)
    +{
    + struct iscsi_cmd *cmd;
    +
    + spin_lock_bh(&conn->cmd_lock);
    + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
    + if (cmd->init_task_tag == init_task_tag)
    + break;
    + }
    + spin_unlock_bh(&conn->cmd_lock);
    +
    + if (!cmd) {
    + printk(KERN_ERR "Unable to locate ITT: 0x%08x on CID: %hu,"
    + " dumping payload\n", init_task_tag, conn->cid);
    + if (length)
    + iscsit_dump_data_payload(conn, length, 1);
    + return NULL;
    + }
    +
    + return cmd;
    +}
    +
    +struct iscsi_cmd *iscsit_find_cmd_from_ttt(
    + struct iscsi_conn *conn,
    + u32 targ_xfer_tag)
    +{
    + struct iscsi_cmd *cmd = NULL;
    +
    + spin_lock_bh(&conn->cmd_lock);
    + list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
    + if (cmd->targ_xfer_tag == targ_xfer_tag)
    + break;
    + }
    + spin_unlock_bh(&conn->cmd_lock);
    +
    + if (!cmd) {
    + printk(KERN_ERR "Unable to locate TTT: 0x%08x on CID: %hu\n",
    + targ_xfer_tag, conn->cid);
    + return NULL;
    + }
    +
    + return cmd;
    +}
    +
    +int iscsit_find_cmd_for_recovery(
    + struct iscsi_session *sess,
    + struct iscsi_cmd **cmd_ptr,
    + struct iscsi_conn_recovery **cr_ptr,
    + u32 init_task_tag)
    +{
    + int found_itt = 0;
    + struct iscsi_cmd *cmd = NULL;
    + struct iscsi_conn_recovery *cr;
    +
    + /*
    + * Scan through the inactive connection recovery list's command list.
    + * If init_task_tag matches the command is still alligent.
    + */
    + spin_lock(&sess->cr_i_lock);
    + list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
    + spin_lock(&cr->conn_recovery_cmd_lock);
    + list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
    + if (cmd->init_task_tag == init_task_tag) {
    + found_itt = 1;
    + break;
    + }
    + }
    + spin_unlock(&cr->conn_recovery_cmd_lock);
    + if (found_itt)
    + break;
    + }
    + spin_unlock(&sess->cr_i_lock);
    +
    + if (cmd) {
    + *cr_ptr = cr;
    + *cmd_ptr = cmd;
    + return -2;
    + }
    +
    + found_itt = 0;
    +
    + /*
    + * Scan through the active connection recovery list's command list.
    + * If init_task_tag matches the command is ready to be reassigned.
    + */
    + spin_lock(&sess->cr_a_lock);
    + list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
    + spin_lock(&cr->conn_recovery_cmd_lock);
    + list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
    + if (cmd->init_task_tag == init_task_tag) {
    + found_itt = 1;
    + break;
    + }
    + }
    + spin_unlock(&cr->conn_recovery_cmd_lock);
    + if (found_itt)
    + break;
    + }
    + spin_unlock(&sess->cr_a_lock);
    +
    + if (!cmd || !cr)
    + return -1;
    +
    + *cr_ptr = cr;
    + *cmd_ptr = cmd;
    +
    + return 0;
    +}
    +
    +void iscsit_add_cmd_to_immediate_queue(
    + struct iscsi_cmd *cmd,
    + struct iscsi_conn *conn,
    + u8 state)
    +{
    + struct iscsi_queue_req *qr;
    +
    + qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
    + if (!qr) {
    + printk(KERN_ERR "Unable to allocate memory for"
    + " struct iscsi_queue_req\n");
    + return;
    + }
    + INIT_LIST_HEAD(&qr->qr_list);
    + qr->cmd = cmd;
    + qr->state = state;
    +
    + spin_lock_bh(&conn->immed_queue_lock);
    + list_add_tail(&qr->qr_list, &conn->immed_queue_list);
    + atomic_inc(&cmd->immed_queue_count);
    + atomic_set(&conn->check_immediate_queue, 1);
    + spin_unlock_bh(&conn->immed_queue_lock);
    +
    + wake_up_process(conn->thread_set->tx_thread);
    +}
    +
    +struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
    +{
    + struct iscsi_queue_req *qr;
    +
    + spin_lock_bh(&conn->immed_queue_lock);
    + if (list_empty(&conn->immed_queue_list)) {
    + spin_unlock_bh(&conn->immed_queue_lock);
    + return NULL;
    + }
    + list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
    + break;
    +
    + list_del(&qr->qr_list);
    + if (qr->cmd)
    + atomic_dec(&qr->cmd->immed_queue_count);
    + spin_unlock_bh(&conn->immed_queue_lock);
    +
    + return qr;
    +}
    +
    +static void iscsit_remove_cmd_from_immediate_queue(
    + struct iscsi_cmd *cmd,
    + struct iscsi_conn *conn)
    +{
    + struct iscsi_queue_req *qr, *qr_tmp;
    +
    + spin_lock_bh(&conn->immed_queue_lock);
    + if (!atomic_read(&cmd->immed_queue_count)) {
    + spin_unlock_bh(&conn->immed_queue_lock);
    + return;
    + }
    +
    + list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
    + if (qr->cmd != cmd)
    + continue;
    +
    + atomic_dec(&qr->cmd->immed_queue_count);
    + list_del(&qr->qr_list);
    + kmem_cache_free(lio_qr_cache, qr);
    + }
    + spin_unlock_bh(&conn->immed_queue_lock);
    +
    + if (atomic_read(&cmd->immed_queue_count)) {
    + printk(KERN_ERR "ITT: 0x%08x immed_queue_count: %d\n",
    + cmd->init_task_tag,
    + atomic_read(&cmd->immed_queue_count));
    + }
    +}
    +
    +void iscsit_add_cmd_to_response_queue(
    + struct iscsi_cmd *cmd,
    + struct iscsi_conn *conn,
    + u8 state)
    +{
    + struct iscsi_queue_req *qr;
    +
    + qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
    + if (!qr) {
    + printk(KERN_ERR "Unable to allocate memory for"
    + " struct iscsi_queue_req\n");
    + return;
    + }
    + INIT_LIST_HEAD(&qr->qr_list);
    + qr->cmd = cmd;
    + qr->state = state;
    +
    + spin_lock_bh(&conn->response_queue_lock);
    + list_add_tail(&qr->qr_list, &conn->response_queue_list);
    + atomic_inc(&cmd->response_queue_count);
    + spin_unlock_bh(&conn->response_queue_lock);
    +
    + wake_up_process(conn->thread_set->tx_thread);
    +}
    +
    +struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
    +{
    + struct iscsi_queue_req *qr;
    +
    + spin_lock_bh(&conn->response_queue_lock);
    + if (list_empty(&conn->response_queue_list)) {
    + spin_unlock_bh(&conn->response_queue_lock);
    + return NULL;
    + }
    +
    + list_for_each_entry(qr, &conn->response_queue_list, qr_list)
    + break;
    +
    + list_del(&qr->qr_list);
    + if (qr->cmd)
    + atomic_dec(&qr->cmd->response_queue_count);
    + spin_unlock_bh(&conn->response_queue_lock);
    +
    + return qr;
    +}
    +
    +static void iscsit_remove_cmd_from_response_queue(
    + struct iscsi_cmd *cmd,
    + struct iscsi_conn *conn)
    +{
    + struct iscsi_queue_req *qr, *qr_tmp;
    +
    + spin_lock_bh(&conn->response_queue_lock);
    + if (!(atomic_read(&cmd->response_queue_count))) {
    + spin_unlock_bh(&conn->response_queue_lock);
    + return;
    + }
    +
    + list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
    + qr_list) {
    + if (qr->cmd != cmd)
    + continue;
    +
    + atomic_dec(&qr->cmd->response_queue_count);
    + list_del(&qr->qr_list);
    + kmem_cache_free(lio_qr_cache, qr);
    + }
    + spin_unlock_bh(&conn->response_queue_lock);
    +
    + if (atomic_read(&cmd->response_queue_count)) {
    + printk(KERN_ERR "ITT: 0x%08x response_queue_count: %d\n",
    + cmd->init_task_tag,
    + atomic_read(&cmd->response_queue_count));
    + }
    +}
    +
    +void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
    +{
    + struct iscsi_queue_req *qr, *qr_tmp;
    +
    + spin_lock_bh(&conn->immed_queue_lock);
    + list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
    + list_del(&qr->qr_list);
    + if (qr->cmd)
    + atomic_dec(&qr->cmd->immed_queue_count);
    +
    + kmem_cache_free(lio_qr_cache, qr);
    + }
    + spin_unlock_bh(&conn->immed_queue_lock);
    +
    + spin_lock_bh(&conn->response_queue_lock);
    + list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
    + qr_list) {
    + list_del(&qr->qr_list);
    + if (qr->cmd)
    + atomic_dec(&qr->cmd->response_queue_count);
    +
    + kmem_cache_free(lio_qr_cache, qr);
    + }
    + spin_unlock_bh(&conn->response_queue_lock);
    +}
    +
    +void iscsit_release_cmd(struct iscsi_cmd *cmd)
    +{
    + struct iscsi_conn *conn = cmd->conn;
    +
    + iscsit_free_r2ts_from_list(cmd);
    + iscsit_free_all_datain_reqs(cmd);
    +
    + kfree(cmd->buf_ptr);
    + kfree(cmd->pdu_list);
    + kfree(cmd->seq_list);
    + kfree(cmd->tmr_req);
    + kfree(cmd->iov_data);
    +
    + if (conn) {
    + iscsit_remove_cmd_from_immediate_queue(cmd, conn);
    + iscsit_remove_cmd_from_response_queue(cmd, conn);
    + }
    +
    + kmem_cache_free(lio_cmd_cache, cmd);
    +}
    +
    +int iscsit_check_session_usage_count(struct iscsi_session *sess)
    +{
    + spin_lock_bh(&sess->session_usage_lock);
    + if (sess->session_usage_count != 0) {
    + sess->session_waiting_on_uc = 1;
    + spin_unlock_bh(&sess->session_usage_lock);
    + if (in_interrupt())
    + return 2;
    +
    + wait_for_completion(&sess->session_waiting_on_uc_comp);
    + return 1;
    + }
    + spin_unlock_bh(&sess->session_usage_lock);
    +
    + return 0;
    +}
    +
    +void iscsit_dec_session_usage_count(struct iscsi_session *sess)
    +{
    + spin_lock_bh(&sess->session_usage_lock);
    + sess->session_usage_count--;
    +
    + if (!sess->session_usage_count && sess->session_waiting_on_uc)
    + complete(&sess->session_waiting_on_uc_comp);
    +
    + spin_unlock_bh(&sess->session_usage_lock);
    +}
    +
    +void iscsit_inc_session_usage_count(struct iscsi_session *sess)
    +{
    + spin_lock_bh(&sess->session_usage_lock);
    + sess->session_usage_count++;
    + spin_unlock_bh(&sess->session_usage_lock);
    +}
    +
    +/*
    + * Used before iscsi_do[rx,tx]_data() to determine iov and [rx,tx]_marker
    + * array counts needed for sync and steering.
    + */
    +static int iscsit_determine_sync_and_steering_counts(
    + struct iscsi_conn *conn,
    + struct iscsi_data_count *count)
    +{
    + u32 length = count->data_length;
    + u32 marker, markint;
    +
    + count->sync_and_steering = 1;
    +
    + marker = (count->type == ISCSI_RX_DATA) ?
    + conn->of_marker : conn->if_marker;
    + markint = (count->type == ISCSI_RX_DATA) ?
    + (conn->conn_ops->OFMarkInt * 4) :
    + (conn->conn_ops->IFMarkInt * 4);
    + count->ss_iov_count = count->iov_count;
    +
    + while (length > 0) {
    + if (length >= marker) {
    + count->ss_iov_count += 3;
    + count->ss_marker_count += 2;
    +
    + length -= marker;
    + marker = markint;
    + } else
    + length = 0;
    + }
    +
    + return 0;
    +}
    +
    +/*
    + * Setup conn->if_marker and conn->of_marker values based upon
    + * the initial marker-less interval. (see iSCSI v19 A.2)
    + */
    +int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
    +{
    + int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
    + /*
    + * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
    + */
    + u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
    + u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
    +
    + if (conn->conn_ops->OFMarker) {
    + /*
    + * Account for the first Login Command received not
    + * via iscsi_recv_msg().
    + */
    + conn->of_marker += ISCSI_HDR_LEN;
    + if (conn->of_marker <= OFMarkInt) {
    + conn->of_marker = (OFMarkInt - conn->of_marker);
    + } else {
    + login_ofmarker_count = (conn->of_marker / OFMarkInt);
    + next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
    + (login_ofmarker_count * MARKER_SIZE);
    + conn->of_marker = (next_marker - conn->of_marker);
    + }
    + conn->of_marker_offset = 0;
    + printk(KERN_INFO "Setting OFMarker value to %u based on Initial"
    + " Markerless Interval.\n", conn->of_marker);
    + }
    +
    + if (conn->conn_ops->IFMarker) {
    + if (conn->if_marker <= IFMarkInt) {
    + conn->if_marker = (IFMarkInt - conn->if_marker);
    + } else {
    + login_ifmarker_count = (conn->if_marker / IFMarkInt);
    + next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
    + (login_ifmarker_count * MARKER_SIZE);
    + conn->if_marker = (next_marker - conn->if_marker);
    + }
    + printk(KERN_INFO "Setting IFMarker value to %u based on Initial"
    + " Markerless Interval.\n", conn->if_marker);
    + }
    +
    + return 0;
    +}
    +
    +struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
    +{
    + struct iscsi_conn *conn;
    +
    + spin_lock_bh(&sess->conn_lock);
    + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
    + if ((conn->cid == cid) &&
    + (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
    + iscsit_inc_conn_usage_count(conn);
    + spin_unlock_bh(&sess->conn_lock);
    + return conn;
    + }
    + }
    + spin_unlock_bh(&sess->conn_lock);
    +
    + return NULL;
    +}
    +
    +struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
    +{
    + struct iscsi_conn *conn;
    +
    + spin_lock_bh(&sess->conn_lock);
    + list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
    + if (conn->cid == cid) {
    + iscsit_inc_conn_usage_count(conn);
    + spin_lock(&conn->state_lock);
    + atomic_set(&conn->connection_wait_rcfr, 1);
    + spin_unlock(&conn->state_lock);
    + spin_unlock_bh(&sess->conn_lock);
    + return conn;
    + }
    + }
    + spin_unlock_bh(&sess->conn_lock);
    +
    + return NULL;
    +}
    +
    +void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
    +{
    + spin_lock_bh(&conn->conn_usage_lock);
    + if (conn->conn_usage_count != 0) {
    + conn->conn_waiting_on_uc = 1;
    + spin_unlock_bh(&conn->conn_usage_lock);
    +
    + wait_for_completion(&conn->conn_waiting_on_uc_comp);
    + return;
    + }
    + spin_unlock_bh(&conn->conn_usage_lock);
    +}
    +
    +void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
    +{
    + spin_lock_bh(&conn->conn_usage_lock);
    + conn->conn_usage_count--;
    +
    + if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
    + complete(&conn->conn_waiting_on_uc_comp);
    +
    + spin_unlock_bh(&conn->conn_usage_lock);
    +}
    +
    +void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
    +{
    + spin_lock_bh(&conn->conn_usage_lock);
    + conn->conn_usage_count++;
    + spin_unlock_bh(&conn->conn_usage_lock);
    +}
    +
    +static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
    +{
    + u8 state;
    + struct iscsi_cmd *cmd;
    +
    + cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
    + if (!cmd)
    + return -1;
    +
    + cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
    + state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
    + ISTATE_SEND_NOPIN_NO_RESPONSE;
    + cmd->init_task_tag = 0xFFFFFFFF;
    + spin_lock_bh(&conn->sess->ttt_lock);
    + cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
    + 0xFFFFFFFF;
    + if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
    + cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
    + spin_unlock_bh(&conn->sess->ttt_lock);
    +
    + spin_lock_bh(&conn->cmd_lock);
    + list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
    + spin_unlock_bh(&conn->cmd_lock);
    +
    + if (want_response)
    + iscsit_start_nopin_response_timer(conn);
    + iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
    +
    + return 0;
    +}
    +
    +static void iscsit_handle_nopin_response_timeout(unsigned long data)
    +{
    + struct iscsi_conn *conn = (struct iscsi_conn *) data;
    +
    + iscsit_inc_conn_usage_count(conn);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + iscsit_dec_conn_usage_count(conn);
    + return;
    + }
    +
    + TRACE(TRACE_TIMER, "Did not receive response to NOPIN on CID: %hu on"
    + " SID: %u, failing connection.\n", conn->cid,
    + conn->sess->sid);
    + conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +
    + {
    + struct iscsi_portal_group *tpg = conn->sess->tpg;
    + struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
    +
    + if (tiqn) {
    + spin_lock_bh(&tiqn->sess_err_stats.lock);
    + strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
    + (void *)conn->sess->sess_ops->InitiatorName);
    + tiqn->sess_err_stats.last_sess_failure_type =
    + ISCSI_SESS_ERR_CXN_TIMEOUT;
    + tiqn->sess_err_stats.cxn_timeout_errors++;
    + conn->sess->conn_timeout_errors++;
    + spin_unlock_bh(&tiqn->sess_err_stats.lock);
    + }
    + }
    +
    + iscsit_cause_connection_reinstatement(conn, 0);
    + iscsit_dec_conn_usage_count(conn);
    +}
    +
    +void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
    +{
    + struct iscsi_session *sess = conn->sess;
    + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + return;
    + }
    +
    + mod_timer(&conn->nopin_response_timer,
    + (get_jiffies_64() + na->nopin_response_timeout * HZ));
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +}
    +
    +/*
    + * Called with conn->nopin_timer_lock held.
    + */
    +void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
    +{
    + struct iscsi_session *sess = conn->sess;
    + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + return;
    + }
    +
    + init_timer(&conn->nopin_response_timer);
    + conn->nopin_response_timer.expires =
    + (get_jiffies_64() + na->nopin_response_timeout * HZ);
    + conn->nopin_response_timer.data = (unsigned long)conn;
    + conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
    + conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
    + conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
    + add_timer(&conn->nopin_response_timer);
    +
    + TRACE(TRACE_TIMER, "Started NOPIN Response Timer on CID: %d to %u"
    + " seconds\n", conn->cid, na->nopin_response_timeout);
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +}
    +
    +void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
    +{
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + return;
    + }
    + conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +
    + del_timer_sync(&conn->nopin_response_timer);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +}
    +
    +static void iscsit_handle_nopin_timeout(unsigned long data)
    +{
    + struct iscsi_conn *conn = (struct iscsi_conn *) data;
    +
    + iscsit_inc_conn_usage_count(conn);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + iscsit_dec_conn_usage_count(conn);
    + return;
    + }
    + conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +
    + iscsit_add_nopin(conn, 1);
    + iscsit_dec_conn_usage_count(conn);
    +}
    +
    +/*
    + * Called with conn->nopin_timer_lock held.
    + */
    +void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
    +{
    + struct iscsi_session *sess = conn->sess;
    + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
    + /*
    + * NOPIN timeout is disabled.
    + */
    + if (!na->nopin_timeout)
    + return;
    +
    + if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
    + return;
    +
    + init_timer(&conn->nopin_timer);
    + conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
    + conn->nopin_timer.data = (unsigned long)conn;
    + conn->nopin_timer.function = iscsit_handle_nopin_timeout;
    + conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
    + conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
    + add_timer(&conn->nopin_timer);
    +
    + TRACE(TRACE_TIMER, "Started NOPIN Timer on CID: %d at %u second"
    + " interval\n", conn->cid, na->nopin_timeout);
    +}
    +
    +void iscsit_start_nopin_timer(struct iscsi_conn *conn)
    +{
    + struct iscsi_session *sess = conn->sess;
    + struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
    + /*
    + * NOPIN timeout is disabled..
    + */
    + if (!na->nopin_timeout)
    + return;
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + return;
    + }
    +
    + init_timer(&conn->nopin_timer);
    + conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
    + conn->nopin_timer.data = (unsigned long)conn;
    + conn->nopin_timer.function = iscsit_handle_nopin_timeout;
    + conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
    + conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
    + add_timer(&conn->nopin_timer);
    +
    + TRACE(TRACE_TIMER, "Started NOPIN Timer on CID: %d at %u second"
    + " interval\n", conn->cid, na->nopin_timeout);
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +}
    +
    +void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
    +{
    + spin_lock_bh(&conn->nopin_timer_lock);
    + if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
    + spin_unlock_bh(&conn->nopin_timer_lock);
    + return;
    + }
    + conn->nopin_timer_flags |= ISCSI_TF_STOP;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +
    + del_timer_sync(&conn->nopin_timer);
    +
    + spin_lock_bh(&conn->nopin_timer_lock);
    + conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
    + spin_unlock_bh(&conn->nopin_timer_lock);
    +}
    +
    +int iscsit_send_tx_data(
    + struct iscsi_cmd *cmd,
    + struct iscsi_conn *conn,
    + int use_misc)
    +{
    + int tx_sent, tx_size;
    + u32 iov_count;
    + struct kvec *iov;
    +
    +send_data:
    + tx_size = cmd->tx_size;
    +
    + if (!use_misc) {
    + iov = &cmd->iov_data[0];
    + iov_count = cmd->iov_data_count;
    + } else {
    + iov = &cmd->iov_misc[0];
    + iov_count = cmd->iov_misc_count;
    + }
    +
    + tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
    + if (tx_size != tx_sent) {
    + if (tx_sent == -EAGAIN) {
    + printk(KERN_ERR "tx_data() returned -EAGAIN\n");
    + goto send_data;
    + } else
    + return -1;
    + }
    + cmd->tx_size = 0;
    +
    + return 0;
    +}
    +
    +int iscsit_fe_sendpage_sg(
    + struct se_unmap_sg *u_sg,
    + struct iscsi_conn *conn)
    +{
    + int tx_sent;
    + struct iscsi_cmd *cmd = (struct iscsi_cmd *)u_sg->fabric_cmd;
    + struct se_cmd *se_cmd = SE_CMD(cmd);
    + u32 len = cmd->tx_size, pg_len, se_len, se_off, tx_size;
    + struct kvec *iov = &cmd->iov_data[0];
    + struct page *page;
    + struct se_mem *se_mem = u_sg->cur_se_mem;
    +
    +send_hdr:
    + tx_size = (conn->conn_ops->HeaderDigest) ? ISCSI_HDR_LEN + ISCSI_CRC_LEN :
    + ISCSI_HDR_LEN;
    + tx_sent = tx_data(conn, iov, 1, tx_size);
    + if (tx_size != tx_sent) {
    + if (tx_sent == -EAGAIN) {
    + printk(KERN_ERR "tx_data() returned -EAGAIN\n");
    + goto send_hdr;
    + }
    + return -1;
    + }
    +
    + len -= tx_size;
    + len -= u_sg->padding;
    + if (conn->conn_ops->DataDigest)
    + len -= ISCSI_CRC_LEN;
    + /*
    + * Start calculating from the first page of current struct se_mem.
    + */
    + page = se_mem->se_page;
    + pg_len = (PAGE_SIZE - se_mem->se_off);
    + se_len = se_mem->se_len;
    + if (se_len < pg_len)
    + pg_len = se_len;
    + se_off = se_mem->se_off;
    + /*
    + * Calucate new se_len and se_off based upon u_sg->t_offset into
    + * the current struct se_mem and possibily a different page.
    + */
    + while (u_sg->t_offset) {
    + if (u_sg->t_offset >= pg_len) {
    + u_sg->t_offset -= pg_len;
    + se_len -= pg_len;
    + se_off = 0;
    + pg_len = PAGE_SIZE;
    + page++;
    + } else {
    + se_off += u_sg->t_offset;
    + se_len -= u_sg->t_offset;
    + u_sg->t_offset = 0;
    + }
    + }
    + /*
    + * Perform sendpage() for each page in the struct se_mem
    + */
    + while (len) {
    + if (se_len > len)
    + se_len = len;
    +send_pg:
    + tx_sent = conn->sock->ops->sendpage(conn->sock,
    + page, se_off, se_len, 0);
    + if (tx_sent != se_len) {
    + if (tx_sent == -EAGAIN) {
    + printk(KERN_ERR "tcp_sendpage() returned"
    + " -EAGAIN\n");
    + goto send_pg;
    + }
    +
    + printk(KERN_ERR "tcp_sendpage() failure: %d\n",
    + tx_sent);
    + return -1;
    + }
    +
    + len -= se_len;
    + if (!(len))
    + break;
    +
    + se_len -= tx_sent;
    + if (!(se_len)) {
    + list_for_each_entry_continue(se_mem,
    + se_cmd->t_task->t_mem_list, se_list)
    + break;
    +
    + if (!se_mem) {
    + printk(KERN_ERR "Unable to locate next struct se_mem\n");
    + return -1;
    + }
    +
    + se_len = se_mem->se_len;
    + se_off = se_mem->se_off;
    + page = se_mem->se_page;
    + } else {
    + se_len = PAGE_SIZE;
    + se_off = 0;
    + page++;
    + }
    + }
    +
    +send_padding:
    + if (u_sg->padding) {
    + struct kvec *iov_p =
    + &cmd->iov_data[cmd->iov_data_count-2];
    +
    + tx_sent = tx_data(conn, iov_p, 1, u_sg->padding);
    + if (u_sg->padding != tx_sent) {
    + if (tx_sent == -EAGAIN) {
    + printk(KERN_ERR "tx_data() returned -EAGAIN\n");
    + goto send_padding;
    + }
    + return -1;
    + }
    + }
    +
    +send_datacrc:
    + if (conn->conn_ops->DataDigest) {
    + struct kvec *iov_d =
    + &cmd->iov_data[cmd->iov_data_count-1];
    +
    + tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
    + if (ISCSI_CRC_LEN != tx_sent) {
    + if (tx_sent == -EAGAIN) {
    + printk(KERN_ERR "tx_data() returned -EAGAIN\n");
    + goto send_datacrc;
    + }
    + return -1;
    + }
    + }
    +
    + return 0;
    +}
    +
    +/*
    + * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
    + * back to the Initiator when an expection condition occurs with the
    + * errors set in status_class and status_detail.
    + *
    + * Parameters: iSCSI Connection, Status Class, Status Detail.
    + * Returns: 0 on success, -1 on error.
    + */
    +int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
    +{
    + u8 iscsi_hdr[ISCSI_HDR_LEN];
    + int err;
    + struct kvec iov;
    + struct iscsi_login_rsp *hdr;
    +
    + iscsit_collect_login_stats(conn, status_class, status_detail);
    +
    + memset(&iov, 0, sizeof(struct kvec));
    + memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
    +
    + hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
    + hdr->opcode = ISCSI_OP_LOGIN_RSP;
    + hdr->status_class = status_class;
    + hdr->status_detail = status_detail;
    + hdr->itt = cpu_to_be32(conn->login_itt);
    +
    + iov.iov_base = &iscsi_hdr;
    + iov.iov_len = ISCSI_HDR_LEN;
    +
    + PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
    +
    + err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
    + if (err != ISCSI_HDR_LEN) {
    + printk(KERN_ERR "tx_data returned less than expected\n");
    + return -1;
    + }
    +
    + return 0;
    +}
    +
    +void iscsit_print_session_params(struct iscsi_session *sess)
    +{
    + struct iscsi_conn *conn;
    +
    + printk(KERN_INFO "-----------------------------[Session Params for"
    + " SID: %u]-----------------------------\n", sess->sid);
    + spin_lock_bh(&sess->conn_lock);
    + list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
    + iscsi_dump_conn_ops(conn->conn_ops);
    + spin_unlock_bh(&sess->conn_lock);
    +
    + iscsi_dump_sess_ops(sess->sess_ops);
    +}
    +
    +static int iscsit_do_rx_data(
    + struct iscsi_conn *conn,
    + struct iscsi_data_count *count)
    +{
    + int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
    + u32 rx_marker_val[count->ss_marker_count], rx_marker_iov = 0;
    + struct kvec iov[count->ss_iov_count], *iov_p;
    + struct msghdr msg;
    +
    + if (!conn || !conn->sock || !conn->conn_ops)
    + return -1;
    +
    + memset(&msg, 0, sizeof(struct msghdr));
    +
    + if (count->sync_and_steering) {
    + int size = 0;
    + u32 i, orig_iov_count = 0;
    + u32 orig_iov_len = 0, orig_iov_loc = 0;
    + u32 iov_count = 0, per_iov_bytes = 0;
    + u32 *rx_marker, old_rx_marker = 0;
    + struct kvec *iov_record;
    +
    + memset(&rx_marker_val, 0,
    + count->ss_marker_count * sizeof(u32));
    + memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
    +
    + iov_record = count->iov;
    + orig_iov_count = count->iov_count;
    + rx_marker = &conn->of_marker;
    +
    + i = 0;
    + size = data;
    + orig_iov_len = iov_record[orig_iov_loc].iov_len;
    + while (size > 0) {
    + TRACE(TRACE_SSLR, "rx_data: #1 orig_iov_len %u,"
    + " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
    + TRACE(TRACE_SSLR, "rx_data: #2 rx_marker %u, size"
    + " %u\n", *rx_marker, size);
    +
    + if (orig_iov_len >= *rx_marker) {
    + iov[iov_count].iov_len = *rx_marker;
    + iov[iov_count++].iov_base =
    + (iov_record[orig_iov_loc].iov_base +
    + per_iov_bytes);
    +
    + iov[iov_count].iov_len = (MARKER_SIZE / 2);
    + iov[iov_count++].iov_base =
    + &rx_marker_val[rx_marker_iov++];
    + iov[iov_count].iov_len = (MARKER_SIZE / 2);
    + iov[iov_count++].iov_base =
    + &rx_marker_val[rx_marker_iov++];
    + old_rx_marker = *rx_marker;
    +
    + /*
    + * OFMarkInt is in 32-bit words.
    + */
    + *rx_marker = (conn->conn_ops->OFMarkInt * 4);
    + size -= old_rx_marker;
    + orig_iov_len -= old_rx_marker;
    + per_iov_bytes += old_rx_marker;
    +
    + TRACE(TRACE_SSLR, "rx_data: #3 new_rx_marker"
    + " %u, size %u\n", *rx_marker, size);
    + } else {
    + iov[iov_count].iov_len = orig_iov_len;
    + iov[iov_count++].iov_base =
    + (iov_record[orig_iov_loc].iov_base +
    + per_iov_bytes);
    +
    + per_iov_bytes = 0;
    + *rx_marker -= orig_iov_len;
    + size -= orig_iov_len;
    +
    + if (size)
    + orig_iov_len =
    + iov_record[++orig_iov_loc].iov_len;
    +
    + TRACE(TRACE_SSLR, "rx_data: #4 new_rx_marker"
    + " %u, size %u\n", *rx_marker, size);
    + }
    + }
    + data += (rx_marker_iov * (MARKER_SIZE / 2));
    +
    + iov_p = &iov[0];
    + iov_len = iov_count;
    +
    + if (iov_count > count->ss_iov_count) {
    + printk(KERN_ERR "iov_count: %d, count->ss_iov_count:"
    + " %d\n", iov_count, count->ss_iov_count);
    + return -1;
    + }
    + if (rx_marker_iov > count->ss_marker_count) {
    + printk(KERN_ERR "rx_marker_iov: %d, count->ss_marker"
    + "_count: %d\n", rx_marker_iov,
    + count->ss_marker_count);
    + return -1;
    + }
    + } else {
    + iov_p = count->iov;
    + iov_len = count->iov_count;
    + }
    +
    + while (total_rx < data) {
    + rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
    + (data - total_rx), MSG_WAITALL);
    + if (rx_loop <= 0) {
    + TRACE(TRACE_NET, "rx_loop: %d total_rx: %d\n",
    + rx_loop, total_rx);
    + return rx_loop;
    + }
    + total_rx += rx_loop;
    + TRACE(TRACE_NET, "rx_loop: %d, total_rx: %d, data: %d\n",
    + rx_loop, total_rx, data);
    + }
    +
    + if (count->sync_and_steering) {
    + int j;
    + for (j = 0; j < rx_marker_iov; j++) {
    + TRACE(TRACE_SSLR, "rx_data: #5 j: %d, offset: %d\n",
    + j, rx_marker_val[j]);
    + conn->of_marker_offset = rx_marker_val[j];
    + }
    + total_rx -= (rx_marker_iov * (MARKER_SIZE / 2));
    + }
    +
    + return total_rx;
    +}
    +
    +static int iscsit_do_tx_data(
    + struct iscsi_conn *conn,
    + struct iscsi_data_count *count)
    +{
    + int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
    + u32 tx_marker_val[count->ss_marker_count], tx_marker_iov = 0;
    + struct kvec iov[count->ss_iov_count], *iov_p;
    + struct msghdr msg;
    +
    + if (!conn || !conn->sock || !conn->conn_ops)
    + return -1;
    +
    + if (data <= 0) {
    + printk(KERN_ERR "Data length is: %d\n", data);
    + return -1;
    + }
    +
    + memset(&msg, 0, sizeof(struct msghdr));
    +
    + if (count->sync_and_steering) {
    + int size = 0;
    + u32 i, orig_iov_count = 0;
    + u32 orig_iov_len = 0, orig_iov_loc = 0;
    + u32 iov_count = 0, per_iov_bytes = 0;
    + u32 *tx_marker, old_tx_marker = 0;
    + struct kvec *iov_record;
    +
    + memset(&tx_marker_val, 0,
    + count->ss_marker_count * sizeof(u32));
    + memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
    +
    + iov_record = count->iov;
    + orig_iov_count = count->iov_count;
    + tx_marker = &conn->if_marker;
    +
    + i = 0;
    + size = data;
    + orig_iov_len = iov_record[orig_iov_loc].iov_len;
    + while (size > 0) {
    + TRACE(TRACE_SSLT, "tx_data: #1 orig_iov_len %u,"
    + " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
    + TRACE(TRACE_SSLT, "tx_data: #2 tx_marker %u, size"
    + " %u\n", *tx_marker, size);
    +
    + if (orig_iov_len >= *tx_marker) {
    + iov[iov_count].iov_len = *tx_marker;
    + iov[iov_count++].iov_base =
    + (iov_record[orig_iov_loc].iov_base +
    + per_iov_bytes);
    +
    + tx_marker_val[tx_marker_iov] =
    + (size - *tx_marker);
    + iov[iov_count].iov_len = (MARKER_SIZE / 2);
    + iov[iov_count++].iov_base =
    + &tx_marker_val[tx_marker_iov++];
    + iov[iov_count].iov_len = (MARKER_SIZE / 2);
    + iov[iov_count++].iov_base =
    + &tx_marker_val[tx_marker_iov++];
    + old_tx_marker = *tx_marker;
    +
    + /*
    + * IFMarkInt is in 32-bit words.
    + */
    + *tx_marker = (conn->conn_ops->IFMarkInt * 4);
    + size -= old_tx_marker;
    + orig_iov_len -= old_tx_marker;
    + per_iov_bytes += old_tx_marker;
    +
    + TRACE(TRACE_SSLT, "tx_data: #3 new_tx_marker"
    + " %u, size %u\n", *tx_marker, size);
    + TRACE(TRACE_SSLT, "tx_data: #4 offset %u\n",
    + tx_marker_val[tx_marker_iov-1]);
    + } else {
    + iov[iov_count].iov_len = orig_iov_len;
    + iov[iov_count++].iov_base
    + = (iov_record[orig_iov_loc].iov_base +
    + per_iov_bytes);
    +
    + per_iov_bytes = 0;
    + *tx_marker -= orig_iov_len;
    + size -= orig_iov_len;
    +
    + if (size)
    + orig_iov_len =
    + iov_record[++orig_iov_loc].iov_len;
    +
    + TRACE(TRACE_SSLT, "tx_data: #5 new_tx_marker"
    + " %u, size %u\n", *tx_marker, size);
    + }
    + }
    +
    + data += (tx_marker_iov * (MARKER_SIZE / 2));
    +
    + iov_p = &iov[0];
    + iov_len = iov_count;
    +
    + if (iov_count > count->ss_iov_count) {
    + printk(KERN_ERR "iov_count: %d, count->ss_iov_count:"
    + " %d\n", iov_count, count->ss_iov_count);
    + return -1;
    + }
    + if (tx_marker_iov > count->ss_marker_count) {
    + printk(KERN_ERR "tx_marker_iov: %d, count->ss_marker"
    + "_count: %d\n", tx_marker_iov,
    + count->ss_marker_count);
    + return -1;
    + }
    + } else {
    + iov_p = count->iov;
    + iov_len = count->iov_count;
    + }
    +
    + while (total_tx < data) {
    + tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
    + (data - total_tx));
    + if (tx_loop <= 0) {
    + TRACE(TRACE_NET, "tx_loop: %d total_tx %d\n",
    + tx_loop, total_tx);
    + return tx_loop;
    + }
    + total_tx += tx_loop;
    + TRACE(TRACE_NET, "tx_loop: %d, total_tx: %d, data: %d\n",
    + tx_loop, total_tx, data);
    + }
    +
    + if (count->sync_and_steering)
    + total_tx -= (tx_marker_iov * (MARKER_SIZE / 2));
    +
    + return total_tx;
    +}
    +
    +int rx_data(
    + struct iscsi_conn *conn,
    + struct kvec *iov,
    + int iov_count,
    + int data)
    +{
    + struct iscsi_data_count c;
    +
    + if (!conn || !conn->sock || !conn->conn_ops)
    + return -1;
    +
    + memset(&c, 0, sizeof(struct iscsi_data_count));
    + c.iov = iov;
    + c.iov_count = iov_count;
    + c.data_length = data;
    + c.type = ISCSI_RX_DATA;
    +
    + if (conn->conn_ops->OFMarker &&
    + (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
    + if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
    + return -1;
    + }
    +
    + return iscsit_do_rx_data(conn, &c);
    +}
    +
    +int tx_data(
    + struct iscsi_conn *conn,
    + struct kvec *iov,
    + int iov_count,
    + int data)
    +{
    + struct iscsi_data_count c;
    +
    + if (!conn || !conn->sock || !conn->conn_ops)
    + return -1;
    +
    + memset(&c, 0, sizeof(struct iscsi_data_count));
    + c.iov = iov;
    + c.iov_count = iov_count;
    + c.data_length = data;
    + c.type = ISCSI_TX_DATA;
    +
    + if (conn->conn_ops->IFMarker &&
    + (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
    + if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
    + return -1;
    + }
    +
    + return iscsit_do_tx_data(conn, &c);
    +}
    +
    +void iscsit_collect_login_stats(
    + struct iscsi_conn *conn,
    + u8 status_class,
    + u8 status_detail)
    +{
    + struct iscsi_param *intrname = NULL;
    + struct iscsi_tiqn *tiqn;
    + struct iscsi_login_stats *ls;
    +
    + tiqn = iscsit_snmp_get_tiqn(conn);
    + if (!(tiqn))
    + return;
    +
    + ls = &tiqn->login_stats;
    +
    + spin_lock(&ls->lock);
    + if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
    + ((get_jiffies_64() - ls->last_fail_time) < 10)) {
    + /* We already have the failure info for this login */
    + spin_unlock(&ls->lock);
    + return;
    + }
    +
    + if (status_class == ISCSI_STATUS_CLS_SUCCESS)
    + ls->accepts++;
    + else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
    + ls->redirects++;
    + ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
    + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
    + (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
    + ls->authenticate_fails++;
    + ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
    + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
    + (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
    + ls->authorize_fails++;
    + ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
    + } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
    + (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
    + ls->negotiate_fails++;
    + ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
    + } else {
    + ls->other_fails++;
    + ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
    + }
    +
    + /* Save initiator name, ip address and time, if it is a failed login */
    + if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
    + if (conn->param_list)
    + intrname = iscsi_find_param_from_key(INITIATORNAME,
    + conn->param_list);
    + strcpy(ls->last_intr_fail_name,
    + (intrname ? intrname->value : "Unknown"));
    +
    + ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
    + snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
    + "%s", conn->login_ip);
    + ls->last_fail_time = get_jiffies_64();
    + }
    +
    + spin_unlock(&ls->lock);
    +}
    +
    +struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
    +{
    + struct iscsi_portal_group *tpg;
    +
    + if (!conn || !conn->sess)
    + return NULL;
    +
    + tpg = conn->sess->tpg;
    + if (!tpg)
    + return NULL;
    +
    + if (!tpg->tpg_tiqn)
    + return NULL;
    +
    + return tpg->tpg_tiqn;
    +}
    diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h
    new file mode 100644
    index 0000000..5015ceb
    --- /dev/null
    +++ b/drivers/target/iscsi/iscsi_target_util.h
    @@ -0,0 +1,98 @@
    +#ifndef ISCSI_TARGET_UTIL_H
    +#define ISCSI_TARGET_UTIL_H
    +
    +#define MARKER_SIZE 8
    +
    +struct se_cmd;
    +
    +struct se_offset_map {
    + int map_reset;
    + u32 iovec_length;
    + u32 iscsi_offset;
    + u32 current_offset;
    + u32 orig_offset;
    + u32 sg_count;
    + u32 sg_current;
    + u32 sg_length;
    + struct page *sg_page;
    + struct se_mem *map_se_mem;
    + struct se_mem *map_orig_se_mem;
    + void *iovec_base;
    +};
    +
    +struct se_map_sg {
    + int sg_kmap_active:1;
    + u32 data_length;
    + u32 data_offset;
    + void *fabric_cmd;
    + struct se_cmd *se_cmd;
    + struct kvec *iov;
    +};
    +
    +struct se_unmap_sg {
    + u32 data_length;
    + u32 sg_count;
    + u32 sg_offset;
    + u32 padding;
    + u32 t_offset;
    + void *fabric_cmd;
    + struct se_cmd *se_cmd;
    + struct se_offset_map lmap;
    + struct se_mem *cur_se_mem;
    +};
    +
    +extern int iscsit_add_r2t_to_list(struct iscsi_cmd *, u32, u32, int, u32);
    +extern struct iscsi_r2t *iscsit_get_r2t_for_eos(struct iscsi_cmd *, u32, u32);
    +extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *);
    +extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *);
    +extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *);
    +extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
    +extern struct iscsi_cmd *iscsit_allocate_se_cmd(struct iscsi_conn *, u32, int, int);
    +extern struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(struct iscsi_conn *, u8);
    +extern int iscsit_decide_list_to_build(struct iscsi_cmd *, u32);
    +extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32);
    +extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *);
    +extern struct iscsi_r2t *iscsit_get_holder_for_r2tsn(struct iscsi_cmd *, u32);
    +extern int iscsit_check_received_cmdsn(struct iscsi_conn *, struct iscsi_cmd *, u32);
    +extern int iscsit_check_unsolicited_dataout(struct iscsi_cmd *, unsigned char *);
    +extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, u32);
    +extern struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(struct iscsi_conn *,
    + u32, u32);
    +extern struct iscsi_cmd *iscsit_find_cmd_from_ttt(struct iscsi_conn *, u32);
    +extern int iscsit_find_cmd_for_recovery(struct iscsi_session *, struct iscsi_cmd **,
    + struct iscsi_conn_recovery **, u32);
    +extern void iscsit_add_cmd_to_immediate_queue(struct iscsi_cmd *, struct iscsi_conn *, u8);
    +extern struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *);
    +extern void iscsit_add_cmd_to_response_queue(struct iscsi_cmd *, struct iscsi_conn *, u8);
    +extern struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *);
    +extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_conn *);
    +extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *);
    +extern void iscsit_release_cmd(struct iscsi_cmd *);
    +extern int iscsit_check_session_usage_count(struct iscsi_session *);
    +extern void iscsit_dec_session_usage_count(struct iscsi_session *);
    +extern void iscsit_inc_session_usage_count(struct iscsi_session *);
    +extern int iscsit_set_sync_and_steering_values(struct iscsi_conn *);
    +extern struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *, u16);
    +extern struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *, u16);
    +extern void iscsit_check_conn_usage_count(struct iscsi_conn *);
    +extern void iscsit_dec_conn_usage_count(struct iscsi_conn *);
    +extern void iscsit_inc_conn_usage_count(struct iscsi_conn *);
    +extern void iscsit_mod_nopin_response_timer(struct iscsi_conn *);
    +extern void iscsit_start_nopin_response_timer(struct iscsi_conn *);
    +extern void iscsit_stop_nopin_response_timer(struct iscsi_conn *);
    +extern void __iscsit_start_nopin_timer(struct iscsi_conn *);
    +extern void iscsit_start_nopin_timer(struct iscsi_conn *);
    +extern void iscsit_stop_nopin_timer(struct iscsi_conn *);
    +extern int iscsit_send_tx_data(struct iscsi_cmd *, struct iscsi_conn *, int);
    +extern int iscsit_fe_sendpage_sg(struct se_unmap_sg *, struct iscsi_conn *);
    +extern int iscsit_tx_login_rsp(struct iscsi_conn *, u8, u8);
    +extern void iscsit_print_session_params(struct iscsi_session *);
    +extern int iscsit_print_dev_to_proc(char *, char **, off_t, int);
    +extern int iscsit_print_sessions_to_proc(char *, char **, off_t, int);
    +extern int iscsit_print_tpg_to_proc(char *, char **, off_t, int);
    +extern int rx_data(struct iscsi_conn *, struct kvec *, int, int);
    +extern int tx_data(struct iscsi_conn *, struct kvec *, int, int);
    +extern void iscsit_collect_login_stats(struct iscsi_conn *, u8, u8);
    +extern struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *);
    +
    +#endif /*** ISCSI_TARGET_UTIL_H ***/
    --
    1.7.5.1
    --
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