tcm_qla2xxx: Add fabric_prot_type attribute support

This patch updates qla2xxx target 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.

This is required for qla_target.c to enable WRITE_STRIP + READ_INSERT
hardware offloads.

It's disabled by default and controls which se_sesion->sess_prot_type
are set at tcm_qla2xxx_check_initiator_node_acl() session registration
time.

Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Saurav Kashyap <saurav.kashyap@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Cc: Martin Petersen <martin.petersen@oracle.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.c b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
index 57346abf566279b138b55a5d417ff73473611a70..843b53b0e9f2c97879b2965c1e373e25ceddf2bd 100644 (file)
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -336,6 +336,14 @@ static int tcm_qla2xxx_check_demo_mode_login_only(struct se_portal_group *se_tpg
        return tpg->tpg_attrib.demo_mode_login_only;
 }
 
+static int tcm_qla2xxx_check_prot_fabric_only(struct se_portal_group *se_tpg)
+{
+       struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
+                               struct tcm_qla2xxx_tpg, se_tpg);
+
+       return tpg->tpg_attrib.fabric_prot_type;
+}
+
 static struct se_node_acl *tcm_qla2xxx_alloc_fabric_acl(
        struct se_portal_group *se_tpg)
 {
@@ -1091,9 +1099,44 @@ static ssize_t tcm_qla2xxx_tpg_show_dynamic_sessions(
 
 TF_TPG_BASE_ATTR_RO(tcm_qla2xxx, dynamic_sessions);
 
+static ssize_t tcm_qla2xxx_tpg_store_fabric_prot_type(
+       struct se_portal_group *se_tpg,
+       const char *page,
+       size_t count)
+{
+       struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
+                               struct tcm_qla2xxx_tpg, 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;
+       }
+       tpg->tpg_attrib.fabric_prot_type = val;
+
+       return count;
+}
+
+static ssize_t tcm_qla2xxx_tpg_show_fabric_prot_type(
+       struct se_portal_group *se_tpg,
+       char *page)
+{
+       struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
+                               struct tcm_qla2xxx_tpg, se_tpg);
+
+       return sprintf(page, "%d\n", tpg->tpg_attrib.fabric_prot_type);
+}
+TF_TPG_BASE_ATTR(tcm_qla2xxx, fabric_prot_type, S_IRUGO | S_IWUSR);
+
 static struct configfs_attribute *tcm_qla2xxx_tpg_attrs[] = {
        &tcm_qla2xxx_tpg_enable.attr,
        &tcm_qla2xxx_tpg_dynamic_sessions.attr,
+       &tcm_qla2xxx_tpg_fabric_prot_type.attr,
        NULL,
 };
 
@@ -1959,6 +2002,7 @@ static struct target_core_fabric_ops tcm_qla2xxx_ops = {
                                        tcm_qla2xxx_check_demo_write_protect,
        .tpg_check_prod_mode_write_protect =
                                        tcm_qla2xxx_check_prod_write_protect,
+       .tpg_check_prot_fabric_only     = tcm_qla2xxx_check_prot_fabric_only,
        .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_demo_mode_login_only,
        .tpg_alloc_fabric_acl           = tcm_qla2xxx_alloc_fabric_acl,
        .tpg_release_fabric_acl         = tcm_qla2xxx_release_fabric_acl,

diff --git a/drivers/scsi/qla2xxx/tcm_qla2xxx.h b/drivers/scsi/qla2xxx/tcm_qla2xxx.h
index 10c002145648cfb2deeda14c0d83568025ec5bef..23295115c9fc60d7ece0b7448e99fe31c2acf6cc 100644 (file)
--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.h
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.h
@@ -33,6 +33,7 @@ struct tcm_qla2xxx_tpg_attrib {
        int demo_mode_write_protect;
        int prod_mode_write_protect;
        int demo_mode_login_only;
+       int fabric_prot_type;
 };
 
 struct tcm_qla2xxx_tpg {