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iscsi_target_util.c
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/*******************************************************************************
* This file contains the iSCSI Target specific utility functions.
*
* \u00a9 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/scsi_tcq.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.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"
#define PRINT_BUFF(buff, len) \
{ \
int zzz; \
\
pr_debug("%d:\n", __LINE__); \
for (zzz = 0; zzz < len; zzz++) { \
if (zzz % 16 == 0) { \
if (zzz) \
pr_debug("\n"); \
pr_debug("%4i: ", zzz); \
} \
pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
} \
if ((len + 1) % 16) \
pr_debug("\n"); \
}
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) {
pr_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)) {
spin_unlock_bh(&cmd->r2t_lock);
return r2t;
}
}
spin_unlock_bh(&cmd->r2t_lock);
pr_err("Unable to locate R2T for Offset: %u, Length:"
" %u\n", offset, length);
return NULL;
}
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) {
spin_unlock_bh(&cmd->r2t_lock);
return r2t;
}
}
spin_unlock_bh(&cmd->r2t_lock);
pr_err("Unable to locate next R2T to send for ITT:"
" 0x%08x.\n", cmd->init_task_tag);
return NULL;
}
/*
* 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) {
pr_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);
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 = MSG_SIMPLE_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
sam_task_attr = MSG_ORDERED_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
sam_task_attr = MSG_HEAD_TAG;
else if (iscsi_task_attr == ISCSI_ATTR_ACA)
sam_task_attr = MSG_ACA_TAG;
else {
pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
" MSG_SIMPLE_TAG\n", iscsi_task_attr);
sam_task_attr = MSG_SIMPLE_TAG;
}
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) {
pr_err("Unable to allocate memory for"
" Task Management command!\n");
goto out;
}
/*
* 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,
MSG_SIMPLE_TAG, &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:
pr_err("Unknown iSCSI TMR Function:"
" 0x%02x\n", function);
goto out;
}
se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
cmd->tmr_req, tcm_function,
GFP_KERNEL);
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);
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) {
pr_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;
}
static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, 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.
*/
if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
pr_err("Received CmdSN: 0x%08x is greater than"
" MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
sess->max_cmd_sn);
ret = CMDSN_ERROR_CANNOT_RECOVER;
} else if (cmdsn == sess->exp_cmd_sn) {
sess->exp_cmd_sn++;
pr_debug("Received CmdSN matches ExpCmdSN,"
" incremented ExpCmdSN to: 0x%08x\n",
sess->exp_cmd_sn);
ret = CMDSN_NORMAL_OPERATION;
} else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
pr_debug("Received CmdSN: 0x%08x is greater"
" than ExpCmdSN: 0x%08x, not acknowledging.\n",
cmdsn, sess->exp_cmd_sn);
ret = CMDSN_HIGHER_THAN_EXP;
} else {
pr_err("Received CmdSN: 0x%08x is less than"
" ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
sess->exp_cmd_sn);
ret = CMDSN_LOWER_THAN_EXP;
}
return ret;
}
/*
* Commands may be received out of order if MC/S is in use.
* Ensure they are executed in CmdSN order.
*/
int iscsit_sequence_cmd(
struct iscsi_conn *conn,
struct iscsi_cmd *cmd,
u32 cmdsn)
{
int ret;
int cmdsn_ret;
mutex_lock(&conn->sess->cmdsn_mutex);
cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
switch (cmdsn_ret) {
case CMDSN_NORMAL_OPERATION:
ret = iscsit_execute_cmd(cmd, 0);
if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
iscsit_execute_ooo_cmdsns(conn->sess);
break;
case CMDSN_HIGHER_THAN_EXP:
ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
break;
case CMDSN_LOWER_THAN_EXP:
cmd->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
ret = cmdsn_ret;
break;
default:
ret = cmdsn_ret;
break;
}
mutex_unlock(&conn->sess->cmdsn_mutex);
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 = &cmd->se_cmd;
struct iscsi_data *hdr = (struct iscsi_data *) buf;
u32 payload_length = ntoh24(hdr->dlength);
if (conn->sess->sess_ops->InitialR2T) {
pr_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) {
pr_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)) {
pr_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) {
spin_unlock_bh(&conn->cmd_lock);
return cmd;
}
}
spin_unlock_bh(&conn->cmd_lock);
pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
init_task_tag, conn->cid);
return NULL;
}
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) {
spin_unlock_bh(&conn->cmd_lock);
return cmd;
}
}
spin_unlock_bh(&conn->cmd_lock);
pr_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;
}
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) {
spin_unlock_bh(&conn->cmd_lock);
return cmd;
}
}
spin_unlock_bh(&conn->cmd_lock);
pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
targ_xfer_tag, conn->cid);
return NULL;
}
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)
{
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) {
spin_unlock(&cr->conn_recovery_cmd_lock);
spin_unlock(&sess->cr_i_lock);
*cr_ptr = cr;
*cmd_ptr = cmd;
return -2;
}
}
spin_unlock(&cr->conn_recovery_cmd_lock);
}
spin_unlock(&sess->cr_i_lock);
/*
* 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) {
spin_unlock(&cr->conn_recovery_cmd_lock);
spin_unlock(&sess->cr_a_lock);
*cr_ptr = cr;
*cmd_ptr = cmd;
return 0;
}
}
spin_unlock(&cr->conn_recovery_cmd_lock);
}
spin_unlock(&sess->cr_a_lock);
return -1;
}
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) {
pr_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)) {
pr_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) {
pr_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)) {
pr_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;
int i;
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);
for (i = 0; i < cmd->t_mem_sg_nents; i++)
__free_page(sg_page(&cmd->t_mem_sg[i]));
kfree(cmd->t_mem_sg);
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);
}
void iscsit_free_cmd(struct iscsi_cmd *cmd)
{
/*
* Determine if a struct se_cmd is assoicated with
* this struct iscsi_cmd.
*/
switch (cmd->iscsi_opcode) {
case ISCSI_OP_SCSI_CMD:
case ISCSI_OP_SCSI_TMFUNC:
transport_generic_free_cmd(&cmd->se_cmd, 1);
break;
case ISCSI_OP_REJECT:
/*
* Handle special case for REJECT when iscsi_add_reject*() has
* overwritten the original iscsi_opcode assignment, and the
* associated cmd->se_cmd needs to be released.
*/
if (cmd->se_cmd.se_tfo != NULL) {
transport_generic_free_cmd(&cmd->se_cmd, 1);
break;
}
/* Fall-through */
default:
iscsit_release_cmd(cmd);
break;
}
}
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);
}
/*
* 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;
pr_debug("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);
}
pr_debug("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);