[PATCH 04/15] target/iscsi: move session_index to common se_session
The next patches will make session$SID dir for each session
so move the iscsi session session_index to the se_session.
This differs from the previous code in that it now uses
idr_alloc_cyclic to help prevent apps from confusing
a reused sid with a previous session.
Signed-off-by: Mike Christie
---
drivers/target/iscsi/iscsi_target.c | 8
drivers/target/iscsi/iscsi_target_configfs.c | 4 +---
drivers/target/iscsi/iscsi_target_login.c| 21 -
drivers/target/iscsi/iscsi_target_stat.c | 3 +--
drivers/target/target_core_transport.c | 25 -
include/target/iscsi/iscsi_target_core.h | 2 --
include/target/target_core_base.h| 1 +
7 files changed, 27 insertions(+), 37 deletions(-)
diff --git a/drivers/target/iscsi/iscsi_target.c
b/drivers/target/iscsi/iscsi_target.c
index d547dcd..6d81a59 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -57,9 +57,7 @@ static DEFINE_SPINLOCK(tiqn_lock);
static DEFINE_MUTEX(np_lock);
static struct idr tiqn_idr;
-struct idr sess_idr;
struct mutex auth_id_lock;
-spinlock_t sess_idr_lock;
struct iscsit_global *iscsit_global;
@@ -698,9 +696,7 @@ static int __init iscsi_target_init_module(void)
spin_lock_init(&iscsit_global->ts_bitmap_lock);
mutex_init(&auth_id_lock);
- spin_lock_init(&sess_idr_lock);
idr_init(&tiqn_idr);
- idr_init(&sess_idr);
ret = target_register_template(&iscsi_ops);
if (ret)
@@ -4373,10 +4369,6 @@ int iscsit_close_session(struct iscsi_session *sess)
pr_debug("Decremented number of active iSCSI Sessions on"
" iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
- spin_lock(&sess_idr_lock);
- idr_remove(&sess_idr, sess->session_index);
- spin_unlock(&sess_idr_lock);
-
kfree(sess->sess_ops);
sess->sess_ops = NULL;
spin_unlock_bh(&se_tpg->session_lock);
diff --git a/drivers/target/iscsi/iscsi_target_configfs.c
b/drivers/target/iscsi/iscsi_target_configfs.c
index 1fcd9bc..39af194 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1357,9 +1357,7 @@ static int iscsi_get_cmd_state(struct se_cmd *se_cmd)
static u32 lio_sess_get_index(struct se_session *se_sess)
{
- struct iscsi_session *sess = se_sess->fabric_sess_ptr;
-
- return sess->session_index;
+ return se_sess->sid;
}
static u32 lio_sess_get_initiator_sid(
diff --git a/drivers/target/iscsi/iscsi_target_login.c
b/drivers/target/iscsi/iscsi_target_login.c
index 923b1a9..d6a4b93 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -336,22 +336,6 @@ static int iscsi_login_zero_tsih_s1(
timer_setup(&sess->time2retain_timer,
iscsit_handle_time2retain_timeout, 0);
- idr_preload(GFP_KERNEL);
- spin_lock_bh(&sess_idr_lock);
- ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
- if (ret >= 0)
- sess->session_index = ret;
- spin_unlock_bh(&sess_idr_lock);
- idr_preload_end();
-
- if (ret < 0) {
- pr_err("idr_alloc() for sess_idr failed\n");
- iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
- ISCSI_LOGIN_STATUS_NO_RESOURCES);
- kfree(sess);
- return -ENOMEM;
- }
-
sess->creation_time = get_jiffies_64();
/*
* The FFP CmdSN window values will be allocated from the TPG's
@@ -1163,11 +1147,6 @@ void iscsi_target_login_sess_out(struct iscsi_conn *conn,
goto old_sess_out;
if (conn->sess->se_sess)
transport_free_session(conn->sess->se_sess);
- if (conn->sess->session_index != 0) {
- spin_lock_bh(&sess_idr_lock);
- idr_remove(&sess_idr, conn->sess->session_index);
- spin_unlock_bh(&sess_idr_lock);
- }
kfree(conn->sess->sess_ops);
kfree(conn->sess);
conn->sess = NULL;
diff --git a/drivers/target/iscsi/iscsi_target_stat.c
b/drivers/target/iscsi/iscsi_target_stat.c
index df0a398..b1a41bf5 100644
--- a/drivers/target/iscsi/iscsi_target_stat.c
+++ b/drivers/target/iscsi/iscsi_target_stat.c
@@ -638,8 +638,7 @@ static ssize_t iscsi_stat_sess_indx_show(struct config_item
*item, char *page)
if (se_sess) {
sess = se_sess->fabric_sess_ptr;
if (sess)
- ret = snprintf(page, PAGE_SIZE, "%u\n",
- sess->session_index);
+ ret = snprintf(page, PAGE_SIZE, "%u\n", se_sess->sid);
}
spin_unlock_bh(&se_nacl->nacl_sess_lock);
diff --git a/drivers/target/target_core_transport.c
b/drivers/target/target_core_transport.c
index 75ddbbb..97a1ee5 100644
--- a/drivers/target/target_core_tra
Re: [PATCH 04/15] target/iscsi: move session_index to common se_session
On Sun, 2018-07-15 at 18:16 -0500, Mike Christie wrote: > diff --git a/drivers/target/target_core_transport.c > b/drivers/target/target_core_transport.c > index 75ddbbb..97a1ee5 100644 > --- a/drivers/target/target_core_transport.c > +++ b/drivers/target/target_core_transport.c > @@ -55,6 +55,8 @@ > > static struct workqueue_struct *target_completion_wq; > static struct kmem_cache *se_sess_cache; > +static DEFINE_SPINLOCK(se_sess_idr_lock); > +static DEFINE_IDR(se_sess_idr); Is it necessary that se_sess_idr_lock and se_sess_idr are global? Could these two data structures be members of the data structure associated with /sys/kernel/config/target/iscsi/$port/$tpg (struct se_portal_group?)? Thanks, Bart.
Re: [PATCH 04/15] target/iscsi: move session_index to common se_session
On 07/18/2018 05:19 PM, Bart Van Assche wrote: > On Sun, 2018-07-15 at 18:16 -0500, Mike Christie wrote: >> diff --git a/drivers/target/target_core_transport.c >> b/drivers/target/target_core_transport.c >> index 75ddbbb..97a1ee5 100644 >> --- a/drivers/target/target_core_transport.c >> +++ b/drivers/target/target_core_transport.c >> @@ -55,6 +55,8 @@ >> >> static struct workqueue_struct *target_completion_wq; >> static struct kmem_cache *se_sess_cache; >> +static DEFINE_SPINLOCK(se_sess_idr_lock); >> +static DEFINE_IDR(se_sess_idr); > > Is it necessary that se_sess_idr_lock and se_sess_idr are global? Could these > two data structures be members of the data structure associated with > /sys/kernel/config/target/iscsi/$port/$tpg (struct se_portal_group?)? For tcmu we have a problem where we pass the scsi commands to userspace but then we need to know what I_T nexus it was sent through or what target port it was received on. I thought I could reuse the sid for tcmu commands where I could embed the sid in the tcmu_cmd and then userspace can look up the sid and know what session the command came in on. If the device is exported through 2 tpgs then we need the sid target wide in case sessions on different tpgs have the same sid. And, then I thought if you exported the device through 2 fabrics then I thought you need it set globally. I am still working on that part with Bodo, so I can make it per tpg when I resend then do another path to change it later.
Re: [PATCH 04/15] target/iscsi: move session_index to common se_session
On 07/18/2018 07:15 PM, Mike Christie wrote: > On 07/18/2018 05:19 PM, Bart Van Assche wrote: >> On Sun, 2018-07-15 at 18:16 -0500, Mike Christie wrote: >>> diff --git a/drivers/target/target_core_transport.c >>> b/drivers/target/target_core_transport.c >>> index 75ddbbb..97a1ee5 100644 >>> --- a/drivers/target/target_core_transport.c >>> +++ b/drivers/target/target_core_transport.c >>> @@ -55,6 +55,8 @@ >>> >>> static struct workqueue_struct *target_completion_wq; >>> static struct kmem_cache *se_sess_cache; >>> +static DEFINE_SPINLOCK(se_sess_idr_lock); >>> +static DEFINE_IDR(se_sess_idr); >> >> Is it necessary that se_sess_idr_lock and se_sess_idr are global? Could these >> two data structures be members of the data structure associated with >> /sys/kernel/config/target/iscsi/$port/$tpg (struct se_portal_group?)? > > For tcmu we have a problem where we pass the scsi commands to userspace > but then we need to know what I_T nexus it was sent through or what > target port it was received on. > > I thought I could reuse the sid for tcmu commands where I could embed > the sid in the tcmu_cmd and then userspace can look up the sid and know > what session the command came in on. If the device is exported through 2 > tpgs then we need the sid target wide in case sessions on different tpgs > have the same sid. And, then I thought if you exported the device > through 2 fabrics then I thought you need it set globally. > > I am still working on that part with Bodo, so I can make it per tpg when > I resend then do another path to change it later. Hey Bart, I looked into this some more and this value is also being used as the scsiAttIntrPortIndex. For that use, does it need to be unique across a target when the target has multiple ports? So I think it needs to be on the se_wwn right?
Re: [PATCH 04/15] target/iscsi: move session_index to common se_session
On Wed, 2018-07-18 at 22:47 -0500, Mike Christie wrote: > Hey Bart, I looked into this some more and this value is also being used > as the scsiAttIntrPortIndex. For that use, does it need to be unique > across a target when the target has multiple ports? > > So I think it needs to be on the se_wwn right? Hello Mike, I think the best solution would be to decouple the session index that is used to export session information through configfs from the session index used by the SCSI-MIB (scsiAttIntrPortIndex). That approach would allow to make both indexes consecutive integers in all cases for both interfaces. However, neither configfs nor the SCSI-MIB requires that session indexes are consecutive integers. So I think moving se_sess_idr_lock and se_sess_idr into struct se_wwn is fine. Bart.
