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>

diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h
index 48f7b3bf4e8c3d2eec3bb413d33d99b6760ce3be..886d74d6f3d4669b6050d2872ea38d924ac3e484 100644 (file)
--- 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 44a5471de00ffe95c5fccdf5462931efa0acc361..76c2b2403ed6ae6e1937009e840d4f99d5b5d2bd 100644 (file)
--- 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);