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OpenCloudOS-Kernel/drivers/target/iscsi/iscsi_target_util.c

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/*******************************************************************************
* This file contains the iSCSI Target specific utility functions.
*
* (c) Copyright 2007-2013 Datera, Inc.
*
* 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 <linux/percpu_ida.h>
#include <net/ipv6.h> /* ipv6_addr_equal() */
#include <scsi/scsi_tcq.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/iscsi/iscsi_transport.h>
#include <target/iscsi/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_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, int state)
{
struct iscsi_cmd *cmd;
struct se_session *se_sess = conn->sess->se_sess;
int size, tag;
tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
if (tag < 0)
return NULL;
size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
memset(cmd, 0, size);
cmd->se_cmd.map_tag = tag;
cmd->conn = conn;
INIT_LIST_HEAD(&cmd->i_conn_node);
INIT_LIST_HEAD(&cmd->datain_list);
INIT_LIST_HEAD(&cmd->cmd_r2t_list);
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;
}
EXPORT_SYMBOL(iscsit_allocate_cmd);
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)
{
u32 max_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.
*/
max_cmdsn = atomic_read(&sess->max_cmd_sn);
if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
pr_err("Received CmdSN: 0x%08x is greater than"
" MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
ret = CMDSN_MAXCMDSN_OVERRUN;
} 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,
unsigned char *buf, __be32 cmdsn)
{
int ret, cmdsn_ret;
bool reject = false;
u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
mutex_lock(&conn->sess->cmdsn_mutex);
cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(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);
else if (ret < 0) {
reject = true;
ret = CMDSN_ERROR_CANNOT_RECOVER;
}
break;
case CMDSN_HIGHER_THAN_EXP:
ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
if (ret < 0) {
reject = true;
ret = CMDSN_ERROR_CANNOT_RECOVER;
break;
}
ret = CMDSN_HIGHER_THAN_EXP;
break;
case CMDSN_LOWER_THAN_EXP:
case CMDSN_MAXCMDSN_OVERRUN:
default:
cmd->i_state = ISTATE_REMOVE;
iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
/*
* Existing callers for iscsit_sequence_cmd() will silently
* ignore commands with CMDSN_LOWER_THAN_EXP, so force this
* return for CMDSN_MAXCMDSN_OVERRUN as well..
*/
ret = CMDSN_LOWER_THAN_EXP;
break;
}
mutex_unlock(&conn->sess->cmdsn_mutex);
if (reject)
iscsit_reject_cmd(cmd, reason, buf);
return ret;
}
EXPORT_SYMBOL(iscsit_sequence_cmd);
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->se_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->se_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,
itt_t init_task_tag)
{
struct iscsi_cmd *cmd;
spin_lock_bh(&conn->cmd_lock);
list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
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;
}
EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
struct iscsi_conn *conn,
itt_t 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_conn_node) {
if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
continue;
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;
}
EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
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_conn_node) {
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,
itt_t 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_conn_node) {
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_conn_node) {
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(&conn->queues_wq);
}
EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
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;
}
qr = list_first_entry(&conn->immed_queue_list,
struct iscsi_queue_req, qr_list);
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(&conn->queues_wq);
}
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;
}
qr = list_first_entry(&conn->response_queue_list,
struct iscsi_queue_req, qr_list);
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));
}
}
bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
{
bool empty;
spin_lock_bh(&conn->immed_queue_lock);
empty = list_empty(&conn->immed_queue_list);
spin_unlock_bh(&conn->immed_queue_lock);
if (!empty)
return empty;
spin_lock_bh(&conn->response_queue_lock);
empty = list_empty(&conn->response_queue_list);
spin_unlock_bh(&conn->response_queue_lock);
return empty;
}
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_session *sess;
struct se_cmd *se_cmd = &cmd->se_cmd;
if (cmd->conn)
sess = cmd->conn->sess;
else
sess = cmd->sess;
BUG_ON(!sess || !sess->se_sess);
kfree(cmd->buf_ptr);
kfree(cmd->pdu_list);
kfree(cmd->seq_list);
kfree(cmd->tmr_req);
kfree(cmd->iov_data);
kfree(cmd->text_in_ptr);
percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
}
EXPORT_SYMBOL(iscsit_release_cmd);
void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
bool check_queues)
{
struct iscsi_conn *conn = cmd->conn;
if (scsi_cmd) {
if (cmd->data_direction == DMA_TO_DEVICE) {
iscsit_stop_dataout_timer(cmd);
iscsit_free_r2ts_from_list(cmd);
}
if (cmd->data_direction == DMA_FROM_DEVICE)
iscsit_free_all_datain_reqs(cmd);
}
if (conn && check_queues) {
iscsit_remove_cmd_from_immediate_queue(cmd, conn);
iscsit_remove_cmd_from_response_queue(cmd, conn);
}
if (conn && conn->conn_transport->iscsit_release_cmd)
conn->conn_transport->iscsit_release_cmd(conn, cmd);
}
void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
{
struct se_cmd *se_cmd = NULL;
int rc;
/*
* Determine if a struct se_cmd is associated with
* this struct iscsi_cmd.
*/
switch (cmd->iscsi_opcode) {
case ISCSI_OP_SCSI_CMD:
se_cmd = &cmd->se_cmd;
__iscsit_free_cmd(cmd, true, shutdown);
/*
* Fallthrough
*/
case ISCSI_OP_SCSI_TMFUNC:
rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
__iscsit_free_cmd(cmd, true, shutdown);
target_put_sess_cmd(se_cmd);
}
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) {
se_cmd = &cmd->se_cmd;
__iscsit_free_cmd(cmd, true, shutdown);
rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
if (!rc && shutdown && se_cmd->se_sess) {
__iscsit_free_cmd(cmd, true, shutdown);
target_put_sess_cmd(se_cmd);
}
break;
}
/* Fall-through */
default:
__iscsit_free_cmd(cmd, false, shutdown);
iscsit_release_cmd(cmd);
break;
}
}
EXPORT_SYMBOL(iscsit_free_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);
}
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, TASK_RUNNING);
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 = RESERVED_ITT;
cmd->targ_xfer_tag = (want_response) ?
session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
spin_lock_bh(&conn->cmd_lock);
list_add_tail(&cmd->i_conn_node, &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;
}
pr_debug("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,
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++;
atomic_long_inc(&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);
pr_debug("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);
pr_debug("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);
pr_debug("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) {
pr_err("tx_data() returned -EAGAIN\n");
goto send_data;
} else
return -1;
}
cmd->tx_size = 0;
return 0;
}
int iscsit_fe_sendpage_sg(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct scatterlist *sg = cmd->first_data_sg;
struct kvec iov;
u32 tx_hdr_size, data_len;
u32 offset = cmd->first_data_sg_off;
int tx_sent, iov_off;
send_hdr:
tx_hdr_size = ISCSI_HDR_LEN;
if (conn->conn_ops->HeaderDigest)
tx_hdr_size += ISCSI_CRC_LEN;
iov.iov_base = cmd->pdu;
iov.iov_len = tx_hdr_size;
tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
if (tx_hdr_size != tx_sent) {
if (tx_sent == -EAGAIN) {
pr_err("tx_data() returned -EAGAIN\n");
goto send_hdr;
}
return -1;
}
data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
/*
* Set iov_off used by padding and data digest tx_data() calls below
* in order to determine proper offset into cmd->iov_data[]
*/
if (conn->conn_ops->DataDigest) {
data_len -= ISCSI_CRC_LEN;
if (cmd->padding)
iov_off = (cmd->iov_data_count - 2);
else
iov_off = (cmd->iov_data_count - 1);
} else {
iov_off = (cmd->iov_data_count - 1);
}
/*
* Perform sendpage() for each page in the scatterlist
*/
while (data_len) {
u32 space = (sg->length - offset);
u32 sub_len = min_t(u32, data_len, space);
send_pg:
tx_sent = conn->sock->ops->sendpage(conn->sock,
sg_page(sg), sg->offset + offset, sub_len, 0);
if (tx_sent != sub_len) {
if (tx_sent == -EAGAIN) {
pr_err("tcp_sendpage() returned"
" -EAGAIN\n");
goto send_pg;
}
pr_err("tcp_sendpage() failure: %d\n",
tx_sent);
return -1;
}
data_len -= sub_len;
offset = 0;
sg = sg_next(sg);
}
send_padding:
if (cmd->padding) {
struct kvec *iov_p = &cmd->iov_data[iov_off++];
tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
if (cmd->padding != tx_sent) {
if (tx_sent == -EAGAIN) {
pr_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[iov_off];
tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
if (ISCSI_CRC_LEN != tx_sent) {
if (tx_sent == -EAGAIN) {
pr_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)
{
struct iscsi_login_rsp *hdr;
struct iscsi_login *login = conn->conn_login;
login->login_failed = 1;
iscsit_collect_login_stats(conn, status_class, status_detail);
memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
hdr = (struct iscsi_login_rsp *)&login->rsp[0];
hdr->opcode = ISCSI_OP_LOGIN_RSP;
hdr->status_class = status_class;
hdr->status_detail = status_detail;
hdr->itt = conn->login_itt;
return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
}
void iscsit_print_session_params(struct iscsi_session *sess)
{
struct iscsi_conn *conn;
pr_debug("-----------------------------[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;
struct msghdr msg;
if (!conn || !conn->sock || !conn->conn_ops)
return -1;
memset(&msg, 0, sizeof(struct msghdr));
iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
count->iov, count->iov_count, data);
while (msg_data_left(&msg)) {
rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
if (rx_loop <= 0) {
pr_debug("rx_loop: %d total_rx: %d\n",
rx_loop, total_rx);
return rx_loop;
}
total_rx += rx_loop;
pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
rx_loop, total_rx, data);
}
return total_rx;
}
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;
return iscsit_do_rx_data(conn, &c);
}
int tx_data(
struct iscsi_conn *conn,
struct kvec *iov,
int iov_count,
int data)
{
struct msghdr msg;
int total_tx = 0;
if (!conn || !conn->sock || !conn->conn_ops)
return -1;
if (data <= 0) {
pr_err("Data length is: %d\n", data);
return -1;
}
memset(&msg, 0, sizeof(struct msghdr));
iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
iov, iov_count, data);
while (msg_data_left(&msg)) {
int tx_loop = sock_sendmsg(conn->sock, &msg);
if (tx_loop <= 0) {
pr_debug("tx_loop: %d total_tx %d\n",
tx_loop, total_tx);
return tx_loop;
}
total_tx += tx_loop;
pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
tx_loop, total_tx, data);
}
return total_tx;
}
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 (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);
strlcpy(ls->last_intr_fail_name,
(intrname ? intrname->value : "Unknown"),
sizeof(ls->last_intr_fail_name));
ls->last_intr_fail_ip_family = conn->login_family;
ls->last_intr_fail_sockaddr = conn->login_sockaddr;
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)
return NULL;
tpg = conn->tpg;
if (!tpg)
return NULL;
if (!tpg->tpg_tiqn)
return NULL;
return tpg->tpg_tiqn;
}
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