Target/configfs: Expose iSCSI network portal group T10-PI support

User may enable T10-PI support per network portal group. any connection
established on top of it, will be required to serve protected transactions.

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

3 files changed, 26 insertions, 0 deletions

diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c
index 1c0088fe9e99..fe35dcbacb14 100644
--- a/drivers/target/iscsi/iscsi_target_configfs.c
+++ b/drivers/target/iscsi/iscsi_target_configfs.c
@@ -1052,6 +1052,11 @@ TPG_ATTR(demo_mode_discovery, S_IRUGO | S_IWUSR);
  */
 DEF_TPG_ATTRIB(default_erl);
 TPG_ATTR(default_erl, S_IRUGO | S_IWUSR);
+/*
+ * Define iscsi_tpg_attrib_s_t10_pi
+ */
+DEF_TPG_ATTRIB(t10_pi);
+TPG_ATTR(t10_pi, S_IRUGO | S_IWUSR);
 
 static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
         &iscsi_tpg_attrib_authentication.attr,
@@ -1064,6 +1069,7 @@ static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
         &iscsi_tpg_attrib_prod_mode_write_protect.attr,
         &iscsi_tpg_attrib_demo_mode_discovery.attr,
         &iscsi_tpg_attrib_default_erl.attr,
+        &iscsi_tpg_attrib_t10_pi.attr,
         NULL,
 };
 
diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
index 76c2b2403ed6..eb96b20dc09e 100644
--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -860,3 +860,22 @@ int iscsit_ta_default_erl(
 
         return 0;
 }
+
+int iscsit_ta_t10_pi(
+        struct iscsi_portal_group *tpg,
+        u32 flag)
+{
+        struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
+
+        if ((flag != 0) && (flag != 1)) {
+                pr_err("Illegal value %d\n", flag);
+                return -EINVAL;
+        }
+
+        a->t10_pi = flag;
+        pr_debug("iSCSI_TPG[%hu] - T10 Protection information bit:"
+                " %s\n", tpg->tpgt, (a->t10_pi) ?
+                "ON" : "OFF");
+
+        return 0;
+}
diff --git a/drivers/target/iscsi/iscsi_target_tpg.h b/drivers/target/iscsi/iscsi_target_tpg.h
index 213c0fc7fdc9..0a182f2aa8a2 100644
--- a/drivers/target/iscsi/iscsi_target_tpg.h
+++ b/drivers/target/iscsi/iscsi_target_tpg.h
@@ -39,5 +39,6 @@ extern int iscsit_ta_demo_mode_write_protect(struct iscsi_portal_group *, u32);
 extern int iscsit_ta_prod_mode_write_protect(struct iscsi_portal_group *, u32);
 extern int iscsit_ta_demo_mode_discovery(struct iscsi_portal_group *, u32);
 extern int iscsit_ta_default_erl(struct iscsi_portal_group *, u32);
+extern int iscsit_ta_t10_pi(struct iscsi_portal_group *, u32);
 
 #endif /* ISCSI_TARGET_TPG_H */