Target/iscsi: Add T10-PI indication for iscsi_portal_group

In case an iscsi portal group will be defined as t10_pi enabled,
all connections on top of it will support protected transactions.

T10-PI support may require extra reource allocation and maintenance by
the transport layer, so we don't want to apply them on non-t10_pi network
portals. This is a hook for the iscsi target layer to signal the transport
at connection establishment that this connection will carry protected
transactions.

Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index 48f7b3bf4e8c..886d74d6f3d4 100644
--- a/drivers/target/iscsi/iscsi_target_core.h
+++ b/drivers/target/iscsi/iscsi_target_core.h
@@ -58,7 +58,8 @@
 #define TA_DEMO_MODE_DISCOVERY          1
 #define TA_DEFAULT_ERL                  0
 #define TA_CACHE_CORE_NPS               0
-
+/* T10 protection information disabled by default */
+#define TA_DEFAULT_T10_PI               0
 
 #define ISCSI_IOV_DATA_BUFFER           5
 
@@ -765,6 +766,7 @@ struct iscsi_tpg_attrib {
         u32                     prod_mode_write_protect;
         u32                     demo_mode_discovery;
         u32                     default_erl;
+        u8                      t10_pi;
         struct iscsi_portal_group *tpg;
 };
 
@@ -787,6 +789,7 @@ struct iscsi_np {
         void                    *np_context;
         struct iscsit_transport *np_transport;
         struct list_head        np_list;
+        struct iscsi_tpg_np     *tpg_np;
 } ____cacheline_aligned;
 
 struct iscsi_tpg_np {
diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
index 44a5471de00f..76c2b2403ed6 100644
--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -225,6 +225,7 @@ static void iscsit_set_default_tpg_attribs(struct iscsi_portal_group *tpg)
         a->prod_mode_write_protect = TA_PROD_MODE_WRITE_PROTECT;
         a->demo_mode_discovery = TA_DEMO_MODE_DISCOVERY;
         a->default_erl = TA_DEFAULT_ERL;
+        a->t10_pi = TA_DEFAULT_T10_PI;
 }
 
 int iscsit_tpg_add_portal_group(struct iscsi_tiqn *tiqn, struct iscsi_portal_group *tpg)
@@ -500,6 +501,7 @@ struct iscsi_tpg_np *iscsit_tpg_add_network_portal(
         init_completion(&tpg_np->tpg_np_comp);
         kref_init(&tpg_np->tpg_np_kref);
         tpg_np->tpg_np          = np;
+        np->tpg_np              = tpg_np;
         tpg_np->tpg             = tpg;
 
         spin_lock(&tpg->tpg_np_lock);