[PATCH v5 0/7] target: make tpg/enable attribute

[PATCH v5 0/7] target: make tpg/enable attribute

[Dmitry Bogdanov]

Many fabric modules provide their own implementation of enable
attribute in tpg.
The change set removes the code duplication and automatically adds
"enable" attribute for fabric modules that has an implementation of
fabric_enable_tpg() ops.

This patchset is intended for scsi-queue.

v5:
 rebase on 5.15/scsi-queue
v4:
 fix compilation error and warning
v3:
 refactor tfc_tpg_base_attrs creation
 avoid alloc of attrs if there are no attributes
 fix newlines
 move enable attribute to target_core_fabric_configfs.c
v2:
 create enable atribute only for modules with enable_tpg ops
 add patches for srpt, usb and ibmvscsi

Dmitry Bogdanov (7):
  target: core: add common tpg/enable attribute
  target: iscsi: replace enable attr to ops.enable
  target: qla2xx: replace enable attr to ops.enable
  target: sbp: replace enable attr to ops.enable
  target: srpt replace enable attr to ops.enable
  target: ibm_vscsi: replace enable attr to ops.enable
  target: usb: replace enable attr to ops.enable

 drivers/infiniband/ulp/srpt/ib_srpt.c        | 38 +-------
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c     | 42 +--------
 drivers/scsi/qla2xxx/tcm_qla2xxx.c           | 73 +++-------------
 drivers/target/iscsi/iscsi_target_configfs.c | 91 +++++++-------------
 drivers/target/sbp/sbp_target.c              | 30 ++-----
 drivers/target/target_core_configfs.c        |  1 +
 drivers/target/target_core_fabric_configfs.c | 78 ++++++++++++++++-
 drivers/usb/gadget/function/f_tcm.c          | 31 ++-----
 include/target/target_core_base.h            |  1 +
 include/target/target_core_fabric.h          |  1 +
 10 files changed, 142 insertions(+), 244 deletions(-)

-- 
2.25.1

[PATCH v5 1/7] target: core: add common tpg/enable attribute

[Dmitry Bogdanov]

Many fabric modules provide their own implementation of enable
attribute in tpg.
The change provides a way to remove code duplication in the fabric
modules and automatically add "enable" attribute if a fabric module has
an implementation of fabric_enable_tpg() ops.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/target/target_core_configfs.c        |  1 +
 drivers/target/target_core_fabric_configfs.c | 78 +++++++++++++++++++-
 include/target/target_core_base.h            |  1 +
 include/target/target_core_fabric.h          |  1 +
 4 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 102ec644bc8a..3b9e50c1ccef 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -490,6 +490,7 @@ void target_unregister_template(const struct target_core_fabric_ops *fo)
 			 * fabric driver unload of TFO->module to proceed.
 			 */
 			rcu_barrier();
+			kfree(t->tf_tpg_base_cit.ct_attrs);
 			kfree(t);
 			return;
 		}
diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
index fc7edc04ee09..0b65de9f2df1 100644
--- a/drivers/target/target_core_fabric_configfs.c
+++ b/drivers/target/target_core_fabric_configfs.c
@@ -815,8 +815,76 @@ static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
 	.release		= target_fabric_tpg_release,
 };
 
-TF_CIT_SETUP_DRV(tpg_base, &target_fabric_tpg_base_item_ops, NULL);
+static ssize_t target_fabric_tpg_base_enable_show(struct config_item *item,
+						  char *page)
+{
+	return sysfs_emit(page, "%d\n", to_tpg(item)->enabled);
+}
+
+static ssize_t target_fabric_tpg_base_enable_store(struct config_item *item,
+						   const char *page,
+						   size_t count)
+{
+	struct se_portal_group *se_tpg = to_tpg(item);
+	int ret;
+	bool op;
+
+	ret = strtobool(page, &op);
+	if (ret)
+		return ret;
+
+	if (se_tpg->enabled == op)
+		return count;
+
+	ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, op);
+	if (ret)
+		return ret;
+
+	se_tpg->enabled = op;
+
+	return count;
+}
+
+CONFIGFS_ATTR(target_fabric_tpg_base_, enable);
 
+static int
+target_fabric_setup_tpg_base_cit(struct target_fabric_configfs *tf)
+{
+	struct config_item_type *cit = &tf->tf_tpg_base_cit;
+	struct configfs_attribute **attrs = NULL;
+	size_t nr_attrs = 0;
+	int i = 0;
+
+	if (tf->tf_ops->tfc_tpg_base_attrs)
+		while (tf->tf_ops->tfc_tpg_base_attrs[nr_attrs] != NULL)
+			nr_attrs++;
+
+	if (tf->tf_ops->fabric_enable_tpg)
+		nr_attrs++;
+
+	if (nr_attrs == 0)
+		goto done;
+
+	/* + 1 for final NULL in the array */
+	attrs = kcalloc(nr_attrs + 1, sizeof(*attrs), GFP_KERNEL);
+	if (!attrs)
+		return -ENOMEM;
+
+	if (tf->tf_ops->tfc_tpg_base_attrs)
+		for (; tf->tf_ops->tfc_tpg_base_attrs[i] != NULL; i++)
+			attrs[i] = tf->tf_ops->tfc_tpg_base_attrs[i];
+
+	if (tf->tf_ops->fabric_enable_tpg)
+		attrs[i] = &target_fabric_tpg_base_attr_enable;
+
+done:
+	cit->ct_item_ops = &target_fabric_tpg_base_item_ops;
+	cit->ct_attrs = attrs;
+	cit->ct_owner = tf->tf_ops->module;
+	pr_debug("Setup generic tpg_base\n");
+
+	return 0;
+}
 /* End of tfc_tpg_base_cit */
 
 /* Start of tfc_tpg_cit */
@@ -1028,12 +1096,18 @@ TF_CIT_SETUP_DRV(discovery, NULL, NULL);
 
 int target_fabric_setup_cits(struct target_fabric_configfs *tf)
 {
+	int ret;
+
 	target_fabric_setup_discovery_cit(tf);
 	target_fabric_setup_wwn_cit(tf);
 	target_fabric_setup_wwn_fabric_stats_cit(tf);
 	target_fabric_setup_wwn_param_cit(tf);
 	target_fabric_setup_tpg_cit(tf);
-	target_fabric_setup_tpg_base_cit(tf);
+
+	ret = target_fabric_setup_tpg_base_cit(tf);
+	if (ret)
+		return ret;
+
 	target_fabric_setup_tpg_port_cit(tf);
 	target_fabric_setup_tpg_port_stat_cit(tf);
 	target_fabric_setup_tpg_lun_cit(tf);
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index fb11c7693b25..2130f102798d 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -900,6 +900,7 @@ struct se_portal_group {
 	 * Negative values can be used by fabric drivers for internal use TPGs.
 	 */
 	int			proto_id;
+	bool			enabled;
 	/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
 	atomic_t		tpg_pr_ref_count;
 	/* Spinlock for adding/removing ACLed Nodes */
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 3c5ade7a04a6..38f0662476d1 100644
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -89,6 +89,7 @@ struct target_core_fabric_ops {
 	void (*add_wwn_groups)(struct se_wwn *);
 	struct se_portal_group *(*fabric_make_tpg)(struct se_wwn *,
 						   const char *);
+	int (*fabric_enable_tpg)(struct se_portal_group *se_tpg, bool enable);
 	void (*fabric_drop_tpg)(struct se_portal_group *);
 	int (*fabric_post_link)(struct se_portal_group *,
 				struct se_lun *);
-- 
2.25.1

[PATCH v5 2/7] target: iscsi: replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg impalmentation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/target/iscsi/iscsi_target_configfs.c | 91 +++++++-------------
 1 file changed, 32 insertions(+), 59 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index f4a24fa5058e..2a9de24a8bbe 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1005,74 +1005,15 @@ static struct configfs_attribute *lio_target_tpg_param_attrs[] = {
 
 /* Start items for lio_target_tpg_cit */
 
-static ssize_t lio_target_tpg_enable_show(struct config_item *item, char *page)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct iscsi_portal_group *tpg = container_of(se_tpg,
-			struct iscsi_portal_group, tpg_se_tpg);
-	ssize_t len;
-
-	spin_lock(&tpg->tpg_state_lock);
-	len = sprintf(page, "%d\n",
-			(tpg->tpg_state == TPG_STATE_ACTIVE) ? 1 : 0);
-	spin_unlock(&tpg->tpg_state_lock);
-
-	return len;
-}
-
-static ssize_t lio_target_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct iscsi_portal_group *tpg = container_of(se_tpg,
-			struct iscsi_portal_group, tpg_se_tpg);
-	u32 op;
-	int ret;
-
-	ret = kstrtou32(page, 0, &op);
-	if (ret)
-		return ret;
-	if ((op != 1) && (op != 0)) {
-		pr_err("Illegal value for tpg_enable: %u\n", op);
-		return -EINVAL;
-	}
-
-	ret = iscsit_get_tpg(tpg);
-	if (ret < 0)
-		return -EINVAL;
-
-	if (op) {
-		ret = iscsit_tpg_enable_portal_group(tpg);
-		if (ret < 0)
-			goto out;
-	} else {
-		/*
-		 * iscsit_tpg_disable_portal_group() assumes force=1
-		 */
-		ret = iscsit_tpg_disable_portal_group(tpg, 1);
-		if (ret < 0)
-			goto out;
-	}
-
-	iscsit_put_tpg(tpg);
-	return count;
-out:
-	iscsit_put_tpg(tpg);
-	return -EINVAL;
-}
-
-
 static ssize_t lio_target_tpg_dynamic_sessions_show(struct config_item *item,
 		char *page)
 {
 	return target_show_dynamic_sessions(to_tpg(item), page);
 }
 
-CONFIGFS_ATTR(lio_target_tpg_, enable);
 CONFIGFS_ATTR_RO(lio_target_tpg_, dynamic_sessions);
 
 static struct configfs_attribute *lio_target_tpg_attrs[] = {
-	&lio_target_tpg_attr_enable,
 	&lio_target_tpg_attr_dynamic_sessions,
 	NULL,
 };
@@ -1129,6 +1070,37 @@ static struct se_portal_group *lio_target_tiqn_addtpg(struct se_wwn *wwn,
 	return NULL;
 }
 
+static int lio_target_tiqn_enabletpg(struct se_portal_group *se_tpg,
+				     bool enable)
+{
+	struct iscsi_portal_group *tpg = container_of(se_tpg,
+			struct iscsi_portal_group, tpg_se_tpg);
+	int ret;
+
+	ret = iscsit_get_tpg(tpg);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (enable) {
+		ret = iscsit_tpg_enable_portal_group(tpg);
+		if (ret < 0)
+			goto out;
+	} else {
+		/*
+		 * iscsit_tpg_disable_portal_group() assumes force=1
+		 */
+		ret = iscsit_tpg_disable_portal_group(tpg, 1);
+		if (ret < 0)
+			goto out;
+	}
+
+	iscsit_put_tpg(tpg);
+	return 0;
+out:
+	iscsit_put_tpg(tpg);
+	return -EINVAL;
+}
+
 static void lio_target_tiqn_deltpg(struct se_portal_group *se_tpg)
 {
 	struct iscsi_portal_group *tpg;
@@ -1556,6 +1528,7 @@ const struct target_core_fabric_ops iscsi_ops = {
 	.fabric_drop_wwn		= lio_target_call_coredeltiqn,
 	.add_wwn_groups			= lio_target_add_wwn_groups,
 	.fabric_make_tpg		= lio_target_tiqn_addtpg,
+	.fabric_enable_tpg		= lio_target_tiqn_enabletpg,
 	.fabric_drop_tpg		= lio_target_tiqn_deltpg,
 	.fabric_make_np			= lio_target_call_addnptotpg,
 	.fabric_drop_np			= lio_target_call_delnpfromtpg,
-- 
2.25.1

[PATCH v5 3/7] target: qla2xx: replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg implementation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/scsi/qla2xxx/tcm_qla2xxx.c | 73 +++++-------------------------
 1 file changed, 12 insertions(+), 61 deletions(-)

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 03de1bcf1461..8fa0056b56dd 100644
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -915,40 +915,17 @@ static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {
 
 /* End items for tcm_qla2xxx_tpg_attrib_cit */
 
-static ssize_t tcm_qla2xxx_tpg_enable_show(struct config_item *item,
-		char *page)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
-			struct tcm_qla2xxx_tpg, se_tpg);
-
-	return snprintf(page, PAGE_SIZE, "%d\n",
-			atomic_read(&tpg->lport_tpg_enabled));
-}
-
-static ssize_t tcm_qla2xxx_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
+static int tcm_qla2xxx_enable_tpg(struct se_portal_group *se_tpg,
+				  bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
 	struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
 			struct tcm_qla2xxx_lport, lport_wwn);
 	struct scsi_qla_host *vha = lport->qla_vha;
 	struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
 			struct tcm_qla2xxx_tpg, se_tpg);
-	unsigned long op;
-	int rc;
 
-	rc = kstrtoul(page, 0, &op);
-	if (rc < 0) {
-		pr_err("kstrtoul() returned %d\n", rc);
-		return -EINVAL;
-	}
-	if ((op != 1) && (op != 0)) {
-		pr_err("Illegal value for tpg_enable: %lu\n", op);
-		return -EINVAL;
-	}
-	if (op) {
+	if (enable) {
 		if (atomic_read(&tpg->lport_tpg_enabled))
 			return -EEXIST;
 
@@ -956,14 +933,14 @@ static ssize_t tcm_qla2xxx_tpg_enable_store(struct config_item *item,
 		qlt_enable_vha(vha);
 	} else {
 		if (!atomic_read(&tpg->lport_tpg_enabled))
-			return count;
+			return 0;
 
 		atomic_set(&tpg->lport_tpg_enabled, 0);
 		qlt_stop_phase1(vha->vha_tgt.qla_tgt);
 		qlt_stop_phase2(vha->vha_tgt.qla_tgt);
 	}
 
-	return count;
+	return 0;
 }
 
 static ssize_t tcm_qla2xxx_tpg_dynamic_sessions_show(struct config_item *item,
@@ -1004,12 +981,10 @@ static ssize_t tcm_qla2xxx_tpg_fabric_prot_type_show(struct config_item *item,
 	return sprintf(page, "%d\n", tpg->tpg_attrib.fabric_prot_type);
 }
 
-CONFIGFS_ATTR(tcm_qla2xxx_tpg_, enable);
 CONFIGFS_ATTR_RO(tcm_qla2xxx_tpg_, dynamic_sessions);
 CONFIGFS_ATTR(tcm_qla2xxx_tpg_, fabric_prot_type);
 
 static struct configfs_attribute *tcm_qla2xxx_tpg_attrs[] = {
-	&tcm_qla2xxx_tpg_attr_enable,
 	&tcm_qla2xxx_tpg_attr_dynamic_sessions,
 	&tcm_qla2xxx_tpg_attr_fabric_prot_type,
 	NULL,
@@ -1083,35 +1058,17 @@ static void tcm_qla2xxx_drop_tpg(struct se_portal_group *se_tpg)
 	kfree(tpg);
 }
 
-static ssize_t tcm_qla2xxx_npiv_tpg_enable_show(struct config_item *item,
-		char *page)
-{
-	return tcm_qla2xxx_tpg_enable_show(item, page);
-}
-
-static ssize_t tcm_qla2xxx_npiv_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
+static int tcm_qla2xxx_npiv_enable_tpg(struct se_portal_group *se_tpg,
+				    bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
 	struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
 			struct tcm_qla2xxx_lport, lport_wwn);
 	struct scsi_qla_host *vha = lport->qla_vha;
 	struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
 			struct tcm_qla2xxx_tpg, se_tpg);
-	unsigned long op;
-	int rc;
 
-	rc = kstrtoul(page, 0, &op);
-	if (rc < 0) {
-		pr_err("kstrtoul() returned %d\n", rc);
-		return -EINVAL;
-	}
-	if ((op != 1) && (op != 0)) {
-		pr_err("Illegal value for tpg_enable: %lu\n", op);
-		return -EINVAL;
-	}
-	if (op) {
+	if (enable) {
 		if (atomic_read(&tpg->lport_tpg_enabled))
 			return -EEXIST;
 
@@ -1119,23 +1076,16 @@ static ssize_t tcm_qla2xxx_npiv_tpg_enable_store(struct config_item *item,
 		qlt_enable_vha(vha);
 	} else {
 		if (!atomic_read(&tpg->lport_tpg_enabled))
-			return count;
+			return 0;
 
 		atomic_set(&tpg->lport_tpg_enabled, 0);
 		qlt_stop_phase1(vha->vha_tgt.qla_tgt);
 		qlt_stop_phase2(vha->vha_tgt.qla_tgt);
 	}
 
-	return count;
+	return 0;
 }
 
-CONFIGFS_ATTR(tcm_qla2xxx_npiv_tpg_, enable);
-
-static struct configfs_attribute *tcm_qla2xxx_npiv_tpg_attrs[] = {
-        &tcm_qla2xxx_npiv_tpg_attr_enable,
-        NULL,
-};
-
 static struct se_portal_group *tcm_qla2xxx_npiv_make_tpg(struct se_wwn *wwn,
 							 const char *name)
 {
@@ -1878,6 +1828,7 @@ static const struct target_core_fabric_ops tcm_qla2xxx_ops = {
 	.fabric_make_wwn		= tcm_qla2xxx_make_lport,
 	.fabric_drop_wwn		= tcm_qla2xxx_drop_lport,
 	.fabric_make_tpg		= tcm_qla2xxx_make_tpg,
+	.fabric_enable_tpg		= tcm_qla2xxx_enable_tpg,
 	.fabric_drop_tpg		= tcm_qla2xxx_drop_tpg,
 	.fabric_init_nodeacl		= tcm_qla2xxx_init_nodeacl,
 
@@ -1918,11 +1869,11 @@ static const struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
 	.fabric_make_wwn		= tcm_qla2xxx_npiv_make_lport,
 	.fabric_drop_wwn		= tcm_qla2xxx_npiv_drop_lport,
 	.fabric_make_tpg		= tcm_qla2xxx_npiv_make_tpg,
+	.fabric_enable_tpg		= tcm_qla2xxx_npiv_enable_tpg,
 	.fabric_drop_tpg		= tcm_qla2xxx_drop_tpg,
 	.fabric_init_nodeacl		= tcm_qla2xxx_init_nodeacl,
 
 	.tfc_wwn_attrs			= tcm_qla2xxx_wwn_attrs,
-	.tfc_tpg_base_attrs		= tcm_qla2xxx_npiv_tpg_attrs,
 };
 
 static int tcm_qla2xxx_register_configfs(void)
-- 
2.25.1

[PATCH v5 4/7] target: sbp: replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg implementation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/target/sbp/sbp_target.c | 30 +++++-------------------------
 1 file changed, 5 insertions(+), 25 deletions(-)

diff --git a/drivers/target/sbp/sbp_target.c b/drivers/target/sbp/sbp_target.c
index b9f9fb5d7e63..504670994fb4 100644
--- a/drivers/target/sbp/sbp_target.c
+++ b/drivers/target/sbp/sbp_target.c
@@ -2125,32 +2125,13 @@ static ssize_t sbp_tpg_directory_id_store(struct config_item *item,
 	return count;
 }
 
-static ssize_t sbp_tpg_enable_show(struct config_item *item, char *page)
+static int sbp_enable_tpg(struct se_portal_group *se_tpg, bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
 	struct sbp_tport *tport = tpg->tport;
-	return sprintf(page, "%d\n", tport->enable);
-}
-
-static ssize_t sbp_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
-	struct sbp_tport *tport = tpg->tport;
-	unsigned long val;
 	int ret;
 
-	if (kstrtoul(page, 0, &val) < 0)
-		return -EINVAL;
-	if ((val != 0) && (val != 1))
-		return -EINVAL;
-
-	if (tport->enable == val)
-		return count;
-
-	if (val) {
+	if (enable) {
 		if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) {
 			pr_err("Cannot enable a target with no LUNs!\n");
 			return -EINVAL;
@@ -2165,7 +2146,7 @@ static ssize_t sbp_tpg_enable_store(struct config_item *item,
 		spin_unlock_bh(&se_tpg->session_lock);
 	}
 
-	tport->enable = val;
+	tport->enable = enable;
 
 	ret = sbp_update_unit_directory(tport);
 	if (ret < 0) {
@@ -2173,15 +2154,13 @@ static ssize_t sbp_tpg_enable_store(struct config_item *item,
 		return ret;
 	}
 
-	return count;
+	return 0;
 }
 
 CONFIGFS_ATTR(sbp_tpg_, directory_id);
-CONFIGFS_ATTR(sbp_tpg_, enable);
 
 static struct configfs_attribute *sbp_tpg_base_attrs[] = {
 	&sbp_tpg_attr_directory_id,
-	&sbp_tpg_attr_enable,
 	NULL,
 };
 
@@ -2319,6 +2298,7 @@ static const struct target_core_fabric_ops sbp_ops = {
 	.fabric_make_wwn		= sbp_make_tport,
 	.fabric_drop_wwn		= sbp_drop_tport,
 	.fabric_make_tpg		= sbp_make_tpg,
+	.fabric_enable_tpg		= sbp_enable_tpg,
 	.fabric_drop_tpg		= sbp_drop_tpg,
 	.fabric_post_link		= sbp_post_link_lun,
 	.fabric_pre_unlink		= sbp_pre_unlink_lun,
-- 
2.25.1

[PATCH v5 5/7] target: srpt replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg implementation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c | 38 +++------------------------
 1 file changed, 4 insertions(+), 34 deletions(-)

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 3cadf1295417..f86ee1c4b970 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -3705,47 +3705,17 @@ static struct configfs_attribute *srpt_da_attrs[] = {
 	NULL,
 };
 
-static ssize_t srpt_tpg_enable_show(struct config_item *item, char *page)
+static int srpt_enable_tpg(struct se_portal_group *se_tpg, bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
 
-	return sysfs_emit(page, "%d\n", sport->enabled);
-}
-
-static ssize_t srpt_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
-	unsigned long tmp;
-	int ret;
-
-	ret = kstrtoul(page, 0, &tmp);
-	if (ret < 0) {
-		pr_err("Unable to extract srpt_tpg_store_enable\n");
-		return -EINVAL;
-	}
-
-	if ((tmp != 0) && (tmp != 1)) {
-		pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
-		return -EINVAL;
-	}
-
 	mutex_lock(&sport->mutex);
-	srpt_set_enabled(sport, tmp);
+	srpt_set_enabled(sport, enable);
 	mutex_unlock(&sport->mutex);
 
-	return count;
+	return 0;
 }
 
-CONFIGFS_ATTR(srpt_tpg_, enable);
-
-static struct configfs_attribute *srpt_tpg_attrs[] = {
-	&srpt_tpg_attr_enable,
-	NULL,
-};
-
 /**
  * srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg
  * @wwn: Corresponds to $driver/$port.
@@ -3856,12 +3826,12 @@ static const struct target_core_fabric_ops srpt_template = {
 	.fabric_make_wwn		= srpt_make_tport,
 	.fabric_drop_wwn		= srpt_drop_tport,
 	.fabric_make_tpg		= srpt_make_tpg,
+	.fabric_enable_tpg		= srpt_enable_tpg,
 	.fabric_drop_tpg		= srpt_drop_tpg,
 	.fabric_init_nodeacl		= srpt_init_nodeacl,
 
 	.tfc_discovery_attrs		= srpt_da_attrs,
 	.tfc_wwn_attrs			= srpt_wwn_attrs,
-	.tfc_tpg_base_attrs		= srpt_tpg_attrs,
 	.tfc_tpg_attrib_attrs		= srpt_tpg_attrib_attrs,
 };
 
-- 
2.25.1

[PATCH v5 6/7] target: ibm_vscsi: replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg implementation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 42 +++---------------------
 1 file changed, 4 insertions(+), 38 deletions(-)

diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
index 10b6c6daaacd..61f06f6885a5 100644
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -3948,41 +3948,16 @@ static struct configfs_attribute *ibmvscsis_wwn_attrs[] = {
 	NULL,
 };
 
-static ssize_t ibmvscsis_tpg_enable_show(struct config_item *item,
-					 char *page)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct ibmvscsis_tport *tport = container_of(se_tpg,
-						     struct ibmvscsis_tport,
-						     se_tpg);
 
-	return snprintf(page, PAGE_SIZE, "%d\n", (tport->enabled) ? 1 : 0);
-}
-
-static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
-					  const char *page, size_t count)
+static int ibmvscsis_enable_tpg(struct se_portal_group *se_tpg, bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct ibmvscsis_tport *tport = container_of(se_tpg,
 						     struct ibmvscsis_tport,
 						     se_tpg);
 	struct scsi_info *vscsi = container_of(tport, struct scsi_info, tport);
-	unsigned long tmp;
-	int rc;
 	long lrc;
 
-	rc = kstrtoul(page, 0, &tmp);
-	if (rc < 0) {
-		dev_err(&vscsi->dev, "Unable to extract srpt_tpg_store_enable\n");
-		return -EINVAL;
-	}
-
-	if ((tmp != 0) && (tmp != 1)) {
-		dev_err(&vscsi->dev, "Illegal value for srpt_tpg_store_enable\n");
-		return -EINVAL;
-	}
-
-	if (tmp) {
+	if (enable) {
 		spin_lock_bh(&vscsi->intr_lock);
 		tport->enabled = true;
 		lrc = ibmvscsis_enable_change_state(vscsi);
@@ -3998,17 +3973,8 @@ static ssize_t ibmvscsis_tpg_enable_store(struct config_item *item,
 		spin_unlock_bh(&vscsi->intr_lock);
 	}
 
-	dev_dbg(&vscsi->dev, "tpg_enable_store, tmp %ld, state %d\n", tmp,
-		vscsi->state);
-
-	return count;
+	return 0;
 }
-CONFIGFS_ATTR(ibmvscsis_tpg_, enable);
-
-static struct configfs_attribute *ibmvscsis_tpg_attrs[] = {
-	&ibmvscsis_tpg_attr_enable,
-	NULL,
-};
 
 static const struct target_core_fabric_ops ibmvscsis_ops = {
 	.module				= THIS_MODULE,
@@ -4038,10 +4004,10 @@ static const struct target_core_fabric_ops ibmvscsis_ops = {
 	.fabric_make_wwn		= ibmvscsis_make_tport,
 	.fabric_drop_wwn		= ibmvscsis_drop_tport,
 	.fabric_make_tpg		= ibmvscsis_make_tpg,
+	.fabric_enable_tpg		= ibmvscsis_enable_tpg,
 	.fabric_drop_tpg		= ibmvscsis_drop_tpg,
 
 	.tfc_wwn_attrs			= ibmvscsis_wwn_attrs,
-	.tfc_tpg_base_attrs		= ibmvscsis_tpg_attrs,
 };
 
 static void ibmvscsis_dev_release(struct device *dev) {};
-- 
2.25.1

[PATCH v5 7/7] target: usb: replace enable attr to ops.enable

[Dmitry Bogdanov]

Remove tpg/enable attribute.
Add fabric ops enable_tpg implementation instead.

Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
---
 drivers/usb/gadget/function/f_tcm.c | 31 ++++++-----------------------
 1 file changed, 6 insertions(+), 25 deletions(-)

diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
index de161ee0b1f9..8e17ac831be0 100644
--- a/drivers/usb/gadget/function/f_tcm.c
+++ b/drivers/usb/gadget/function/f_tcm.c
@@ -1495,42 +1495,24 @@ static struct configfs_attribute *usbg_wwn_attrs[] = {
 	NULL,
 };
 
-static ssize_t tcm_usbg_tpg_enable_show(struct config_item *item, char *page)
-{
-	struct se_portal_group *se_tpg = to_tpg(item);
-	struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
-
-	return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
-}
-
 static int usbg_attach(struct usbg_tpg *);
 static void usbg_detach(struct usbg_tpg *);
 
-static ssize_t tcm_usbg_tpg_enable_store(struct config_item *item,
-		const char *page, size_t count)
+static int usbg_enable_tpg(struct se_portal_group *se_tpg, bool enable)
 {
-	struct se_portal_group *se_tpg = to_tpg(item);
 	struct usbg_tpg  *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
-	bool op;
-	ssize_t ret;
-
-	ret = strtobool(page, &op);
-	if (ret)
-		return ret;
-
-	if ((op && tpg->gadget_connect) || (!op && !tpg->gadget_connect))
-		return -EINVAL;
+	int ret = 0;
 
-	if (op)
+	if (enable)
 		ret = usbg_attach(tpg);
 	else
 		usbg_detach(tpg);
 	if (ret)
 		return ret;
 
-	tpg->gadget_connect = op;
+	tpg->gadget_connect = enable;
 
-	return count;
+	return 0;
 }
 
 static ssize_t tcm_usbg_tpg_nexus_show(struct config_item *item, char *page)
@@ -1673,11 +1655,9 @@ static ssize_t tcm_usbg_tpg_nexus_store(struct config_item *item,
 	return count;
 }
 
-CONFIGFS_ATTR(tcm_usbg_tpg_, enable);
 CONFIGFS_ATTR(tcm_usbg_tpg_, nexus);
 
 static struct configfs_attribute *usbg_base_attrs[] = {
-	&tcm_usbg_tpg_attr_enable,
 	&tcm_usbg_tpg_attr_nexus,
 	NULL,
 };
@@ -1730,6 +1710,7 @@ static const struct target_core_fabric_ops usbg_ops = {
 	.fabric_make_wwn		= usbg_make_tport,
 	.fabric_drop_wwn		= usbg_drop_tport,
 	.fabric_make_tpg		= usbg_make_tpg,
+	.fabric_enable_tpg		= usbg_enable_tpg,
 	.fabric_drop_tpg		= usbg_drop_tpg,
 	.fabric_post_link		= usbg_port_link,
 	.fabric_pre_unlink		= usbg_port_unlink,
-- 
2.25.1

Re: [PATCH v5 5/7] target: srpt replace enable attr to ops.enable

[Bart Van Assche]

On 9/10/21 01:41, Dmitry Bogdanov wrote:
> Remove tpg/enable attribute.
> Add fabric ops enable_tpg implementation instead.

How about changing the prefix from "target: srpt" into "RDMA/srpt:"
since that is the prefix that is used for other ib_srpt patches?

Anyway:

Reviewed-by: Bart Van Assche <bvanassche@acm.org>

Re: [PATCH v5 1/7] target: core: add common tpg/enable attribute

[Bodo Stroesser]

On 10.09.21 10:41, Dmitry Bogdanov wrote:
> Many fabric modules provide their own implementation of enable
> attribute in tpg.
> The change provides a way to remove code duplication in the fabric
> modules and automatically add "enable" attribute if a fabric module has
> an implementation of fabric_enable_tpg() ops.
> 
> Reviewed-by: Roman Bolshakov <r.bolshakov@yadro.com>
> Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
> ---
>   drivers/target/target_core_configfs.c        |  1 +
>   drivers/target/target_core_fabric_configfs.c | 78 +++++++++++++++++++-
>   include/target/target_core_base.h            |  1 +
>   include/target/target_core_fabric.h          |  1 +
>   4 files changed, 79 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
> index 102ec644bc8a..3b9e50c1ccef 100644
> --- a/drivers/target/target_core_configfs.c
> +++ b/drivers/target/target_core_configfs.c
> @@ -490,6 +490,7 @@ void target_unregister_template(const struct target_core_fabric_ops *fo)
>   			 * fabric driver unload of TFO->module to proceed.
>   			 */
>   			rcu_barrier();
> +			kfree(t->tf_tpg_base_cit.ct_attrs);
>   			kfree(t);
>   			return;
>   		}
> diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
> index fc7edc04ee09..0b65de9f2df1 100644
> --- a/drivers/target/target_core_fabric_configfs.c
> +++ b/drivers/target/target_core_fabric_configfs.c
> @@ -815,8 +815,76 @@ static struct configfs_item_operations target_fabric_tpg_base_item_ops = {
>   	.release		= target_fabric_tpg_release,
>   };
>   
> -TF_CIT_SETUP_DRV(tpg_base, &target_fabric_tpg_base_item_ops, NULL);
> +static ssize_t target_fabric_tpg_base_enable_show(struct config_item *item,
> +						  char *page)
> +{
> +	return sysfs_emit(page, "%d\n", to_tpg(item)->enabled);
> +}
> +
> +static ssize_t target_fabric_tpg_base_enable_store(struct config_item *item,
> +						   const char *page,
> +						   size_t count)
> +{
> +	struct se_portal_group *se_tpg = to_tpg(item);
> +	int ret;
> +	bool op;
> +
> +	ret = strtobool(page, &op);
> +	if (ret)
> +		return ret;
> +
> +	if (se_tpg->enabled == op)
> +		return count;

Sorry for jumping in lately.

Just one nit:
In case someone tries to enable or disable the same tpg a second time,
with the change we always do nothing and return count (--> OK).

I just checked iscsi and qla2xxx. AFAICS iscsi before the patch rejected
the second enable or disable with -EINVAL, while qla2xxx accepts the
second disable and rejects the second enable with -EEXIST.

Of course it sounds good to unify the behavior of existing enable
attributes. OTOH: even if enabling/disabling the same tpg twice can be
seen as suspicious behavior, are we sure to not confuse existing user 
space tools by changing the result?

Bodo

RE: [PATCH v5 1/7] target: core: add common tpg/enable attribute

[Dmitriy Bogdanov]

Hi Bodo,

> > +	if (se_tpg->enabled == op)
> > +		return count;

> Sorry for jumping in lately.

> Just one nit:
> In case someone tries to enable or disable the same tpg a second time, with
> the change we always do nothing and return count (--> OK).
>
> I just checked iscsi and qla2xxx. AFAICS iscsi before the patch rejected the
> second enable or disable with -EINVAL, while qla2xxx accepts the second
> disable and rejects the second enable with -EEXIST.
>
> Of course it sounds good to unify the behavior of existing enable
> attributes. OTOH: even if enabling/disabling the same tpg twice can be seen
> as suspicious behavior, are we sure to not confuse existing user space tools
> by changing the result?

targetcli tool does not check the result of disable/enable at all.
Our proprietary application checks a result but does not check the particular
return code, and the application does not expect the failure of the same second
request.

It's hardly to imagine why someone should expect the second enable and especially
the second disable to fail - the requested operation(disable or enable) is successfully
done for the caller.

BR,
 Dmitry

Re: [PATCH v5 0/7] target: make tpg/enable attribute

[Mike Christie]

On 9/10/21 3:41 AM, Dmitry Bogdanov wrote:
> Many fabric modules provide their own implementation of enable
> attribute in tpg.
> The change set removes the code duplication and automatically adds
> "enable" attribute for fabric modules that has an implementation of
> fabric_enable_tpg() ops.
> 
> This patchset is intended for scsi-queue.
> 

Reviewed-by: Mike Christie <michael.christie@oracle.com>

Re: [PATCH v5 0/7] target: make tpg/enable attribute

[Martin K. Petersen]

>> Many fabric modules provide their own implementation of enable
>> attribute in tpg.  The change set removes the code duplication and
>> automatically adds "enable" attribute for fabric modules that has an
>> implementation of fabric_enable_tpg() ops.

Applied to 5.16/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

Re: [PATCH v5 0/7] target: make tpg/enable attribute

[Martin K. Petersen]

On Fri, 10 Sep 2021 11:41:26 +0300, Dmitry Bogdanov wrote:

> Many fabric modules provide their own implementation of enable
> attribute in tpg.
> The change set removes the code duplication and automatically adds
> "enable" attribute for fabric modules that has an implementation of
> fabric_enable_tpg() ops.
> 
> This patchset is intended for scsi-queue.
> 
> [...]

Applied to 5.16/scsi-queue, thanks!

[1/7] target: core: add common tpg/enable attribute
      https://git.kernel.org/mkp/scsi/c/80ed33c8ba93
[2/7] target: iscsi: replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/382731ec01b3
[3/7] target: qla2xx: replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/cb8717a720a9
[4/7] target: sbp: replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/fb00af92e5db
[5/7] target: srpt replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/9465b4871af0
[6/7] target: ibm_vscsi: replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/d7e2932bba1b
[7/7] target: usb: replace enable attr to ops.enable
      https://git.kernel.org/mkp/scsi/c/5384ee089d1f

-- 
Martin K. Petersen	Oracle Linux Engineering