loopback: Add fabric_prot_type attribute support
This patch updates loopback to add a new fabric_prot_type TPG attribute,
used for controlling LLD level protection into LIO when the backend
device does not support T10-PI.
Also, go ahead and set DIN_PASS + DOUT_PASS so target-core knows that
it will be doing any WRITE_STRIP and READ_INSERT operations.
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index f4618e7..797c731 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -697,6 +697,13 @@
return 0;
}
+static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+ return tl_tpg->tl_fabric_prot_type;
+}
+
static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
struct se_portal_group *se_tpg)
{
@@ -912,6 +919,46 @@
/* End items for tcm_loop_port_cit */
+static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type(
+ struct se_portal_group *se_tpg,
+ char *page)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+
+ return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
+}
+
+static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type(
+ struct se_portal_group *se_tpg,
+ const char *page,
+ size_t count)
+{
+ struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
+ tl_se_tpg);
+ unsigned long val;
+ int ret = kstrtoul(page, 0, &val);
+
+ if (ret) {
+ pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
+ return ret;
+ }
+ if (val != 0 && val != 1 && val != 3) {
+ pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
+ return -EINVAL;
+ }
+ tl_tpg->tl_fabric_prot_type = val;
+
+ return count;
+}
+
+TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR);
+
+static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
+ &tcm_loop_tpg_attrib_fabric_prot_type.attr,
+ NULL,
+};
+
/* Start items for tcm_loop_nexus_cit */
static int tcm_loop_make_nexus(
@@ -937,7 +984,8 @@
/*
* Initialize the struct se_session pointer
*/
- tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
+ tl_nexus->se_sess = transport_init_session(
+ TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS);
if (IS_ERR(tl_nexus->se_sess)) {
ret = PTR_ERR(tl_nexus->se_sess);
goto out;
@@ -1377,6 +1425,8 @@
&tcm_loop_check_demo_mode_write_protect;
fabric->tf_ops.tpg_check_prod_mode_write_protect =
&tcm_loop_check_prod_mode_write_protect;
+ fabric->tf_ops.tpg_check_prot_fabric_only =
+ &tcm_loop_check_prot_fabric_only;
/*
* The TCM loopback fabric module runs in demo-mode to a local
* virtual SCSI device, so fabric dependent initator ACLs are
@@ -1429,7 +1479,7 @@
*/
fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
- fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
+ fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = tcm_loop_tpg_attrib_attrs;
fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
/*
diff --git a/drivers/target/loopback/tcm_loop.h b/drivers/target/loopback/tcm_loop.h
index 6ae49f2..1e72ff7 100644
--- a/drivers/target/loopback/tcm_loop.h
+++ b/drivers/target/loopback/tcm_loop.h
@@ -43,6 +43,7 @@
struct tcm_loop_tpg {
unsigned short tl_tpgt;
unsigned short tl_transport_status;
+ enum target_prot_type tl_fabric_prot_type;
atomic_t tl_tpg_port_count;
struct se_portal_group tl_se_tpg;
struct tcm_loop_hba *tl_hba;