scsi: target: Add default fabric ops callouts

There are several callouts in target fabric ops that most of fabric drivers
fill with a function returning the same value.

Stop requiring such callouts to exist in the ops, fill them in TCM Core.

Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Link: https://lore.kernel.org/r/20230313181110.20566-2-d.bogdanov@yadro.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 61 insertions, 33 deletions

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 611b0424e305..74b67c346dfe 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -335,6 +335,29 @@ EXPORT_SYMBOL(target_undepend_item);
 /*##############################################################################
 // Start functions called by external Target Fabrics Modules
 //############################################################################*/
+static int target_disable_feature(struct se_portal_group *se_tpg)
+{
+	return 0;
+}
+
+static u32 target_default_get_inst_index(struct se_portal_group *se_tpg)
+{
+	return 1;
+}
+
+static u32 target_default_sess_get_index(struct se_session *se_sess)
+{
+	return 0;
+}
+
+static void target_set_default_node_attributes(struct se_node_acl *se_acl)
+{
+}
+
+static int target_default_get_cmd_state(struct se_cmd *se_cmd)
+{
+	return 0;
+}
 
 static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 {
@@ -362,46 +385,14 @@ static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 		pr_err("Missing tfo->tpg_get_tag()\n");
 		return -EINVAL;
 	}
-	if (!tfo->tpg_check_demo_mode) {
-		pr_err("Missing tfo->tpg_check_demo_mode()\n");
-		return -EINVAL;
-	}
-	if (!tfo->tpg_check_demo_mode_cache) {
-		pr_err("Missing tfo->tpg_check_demo_mode_cache()\n");
-		return -EINVAL;
-	}
-	if (!tfo->tpg_check_demo_mode_write_protect) {
-		pr_err("Missing tfo->tpg_check_demo_mode_write_protect()\n");
-		return -EINVAL;
-	}
-	if (!tfo->tpg_check_prod_mode_write_protect) {
-		pr_err("Missing tfo->tpg_check_prod_mode_write_protect()\n");
-		return -EINVAL;
-	}
-	if (!tfo->tpg_get_inst_index) {
-		pr_err("Missing tfo->tpg_get_inst_index()\n");
-		return -EINVAL;
-	}
 	if (!tfo->release_cmd) {
 		pr_err("Missing tfo->release_cmd()\n");
 		return -EINVAL;
 	}
-	if (!tfo->sess_get_index) {
-		pr_err("Missing tfo->sess_get_index()\n");
-		return -EINVAL;
-	}
 	if (!tfo->write_pending) {
 		pr_err("Missing tfo->write_pending()\n");
 		return -EINVAL;
 	}
-	if (!tfo->set_default_node_attributes) {
-		pr_err("Missing tfo->set_default_node_attributes()\n");
-		return -EINVAL;
-	}
-	if (!tfo->get_cmd_state) {
-		pr_err("Missing tfo->get_cmd_state()\n");
-		return -EINVAL;
-	}
 	if (!tfo->queue_data_in) {
 		pr_err("Missing tfo->queue_data_in()\n");
 		return -EINVAL;
@@ -447,8 +438,36 @@ static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 	return 0;
 }
 
+static void target_set_default_ops(struct target_core_fabric_ops *tfo)
+{
+	if (!tfo->tpg_check_demo_mode)
+		tfo->tpg_check_demo_mode = target_disable_feature;
+
+	if (!tfo->tpg_check_demo_mode_cache)
+		tfo->tpg_check_demo_mode_cache = target_disable_feature;
+
+	if (!tfo->tpg_check_demo_mode_write_protect)
+		tfo->tpg_check_demo_mode_write_protect = target_disable_feature;
+
+	if (!tfo->tpg_check_prod_mode_write_protect)
+		tfo->tpg_check_prod_mode_write_protect = target_disable_feature;
+
+	if (!tfo->tpg_get_inst_index)
+		tfo->tpg_get_inst_index = target_default_get_inst_index;
+
+	if (!tfo->sess_get_index)
+		tfo->sess_get_index = target_default_sess_get_index;
+
+	if (!tfo->set_default_node_attributes)
+		tfo->set_default_node_attributes = target_set_default_node_attributes;
+
+	if (!tfo->get_cmd_state)
+		tfo->get_cmd_state = target_default_get_cmd_state;
+}
+
 int target_register_template(const struct target_core_fabric_ops *fo)
 {
+	struct target_core_fabric_ops *tfo;
 	struct target_fabric_configfs *tf;
 	int ret;
 
@@ -461,10 +480,18 @@ int target_register_template(const struct target_core_fabric_ops *fo)
 		pr_err("%s: could not allocate memory!\n", __func__);
 		return -ENOMEM;
 	}
+	tfo = kzalloc(sizeof(struct target_core_fabric_ops), GFP_KERNEL);
+	if (!tfo) {
+		kfree(tf);
+		pr_err("%s: could not allocate memory!\n", __func__);
+		return -ENOMEM;
+	}
+	memcpy(tfo, fo, sizeof(*tfo));
+	target_set_default_ops(tfo);
 
 	INIT_LIST_HEAD(&tf->tf_list);
 	atomic_set(&tf->tf_access_cnt, 0);
-	tf->tf_ops = fo;
+	tf->tf_ops = tfo;
 	target_fabric_setup_cits(tf);
 
 	mutex_lock(&g_tf_lock);
@@ -492,6 +519,7 @@ void target_unregister_template(const struct target_core_fabric_ops *fo)
 			 */
 			rcu_barrier();
 			kfree(t->tf_tpg_base_cit.ct_attrs);
+			kfree(t->tf_ops);
 			kfree(t);
 			return;
 		}