iscsi-target: Add tpg_enabled_sendtargets for disabled discovery

This patch adds a new tpg_enabled_sendtargets configfs attribute
to allow in-band sendtargets discovery information to include
target-portal-groups (TPGs) in !TPG_STATE_ACTIVE state.

This functionality is useful for clustered iSCSI targets, where
TPGTs handled on remote cluster nodes should be advertised in
the SendTargets response.

By default, this new attribute retains the default behaviour of
existing code which to ignore portal-groups in !TPG_STATE_ACTIVE
state.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h
index 34117b8b72e4..ab465858f462 100644
--- a/include/target/iscsi/iscsi_target_core.h
+++ b/include/target/iscsi/iscsi_target_core.h
@@ -62,6 +62,8 @@
 /* T10 protection information disabled by default */
 #define TA_DEFAULT_T10_PI		0
 #define TA_DEFAULT_FABRIC_PROT_TYPE	0
+/* TPG status needs to be enabled to return sendtargets discovery endpoint info */
+#define TA_DEFAULT_TPG_ENABLED_SENDTARGETS 1
 
 #define ISCSI_IOV_DATA_BUFFER		5
 
@@ -763,6 +765,7 @@ struct iscsi_tpg_attrib {
 	u32			default_erl;
 	u8			t10_pi;
 	u32			fabric_prot_type;
+	u32			tpg_enabled_sendtargets;
 	struct iscsi_portal_group *tpg;
 };