[SCSI] iscsi class: expand vlan support

Add support to set vlan priority and enable/disble a vlan.

Patch based on code from Vikas Chaudhary.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/scsi_transport_iscsi.c

@@ -319,6 +319,8 @@ iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
 /* common read only iface attribute */
 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
+iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
+iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 
 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 					  struct attribute *attr, int i)
@@ -332,6 +334,10 @@ static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 		param = ISCSI_NET_PARAM_IFACE_ENABLE;
 	else if (attr == &dev_attr_iface_vlan.attr)
 		param = ISCSI_NET_PARAM_VLAN_ID;
+	else if (attr == &dev_attr_iface_vlan_priority.attr)
+		param = ISCSI_NET_PARAM_VLAN_PRIORITY;
+	else if (attr == &dev_attr_iface_vlan_enabled.attr)
+		param = ISCSI_NET_PARAM_VLAN_ENABLED;
 	else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 		if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 			param = ISCSI_NET_PARAM_IPV4_ADDR;
@@ -367,6 +373,8 @@ static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 static struct attribute *iscsi_iface_attrs[] = {
 	&dev_attr_iface_enabled.attr,
 	&dev_attr_iface_vlan.attr,
+	&dev_attr_iface_vlan_priority.attr,
+	&dev_attr_iface_vlan_enabled.attr,
 	&dev_attr_ipv4_iface_ipaddress.attr,
 	&dev_attr_ipv4_iface_gateway.attr,
 	&dev_attr_ipv4_iface_subnet.attr,

include/scsi/iscsi_if.h

@@ -281,6 +281,13 @@ struct iscsi_path {
 #define ISCSI_IFACE_TYPE_IPV4		0x01
 #define ISCSI_IFACE_TYPE_IPV6		0x02
 
+#define ISCSI_MAX_VLAN_ID		4095
+#define ISCSI_MAX_VLAN_PRIORITY		7
+
+/* iscsi vlan enable/disabled setting */
+#define ISCSI_VLAN_DISABLE	0x01
+#define ISCSI_VLAN_ENABLE	0x02
+
 /* iSCSI network params */
 enum iscsi_net_param {
 	ISCSI_NET_PARAM_IPV4_ADDR		= 1,
@@ -296,8 +303,10 @@ enum iscsi_net_param {
 	ISCSI_NET_PARAM_IPV6_ROUTER_AUTOCFG	= 11,
 	ISCSI_NET_PARAM_IFACE_ENABLE		= 12,
 	ISCSI_NET_PARAM_VLAN_ID			= 13,
-	ISCSI_NET_PARAM_IFACE_TYPE		= 14,
-	ISCSI_NET_PARAM_IFACE_NAME		= 15,
+	ISCSI_NET_PARAM_VLAN_PRIORITY		= 14,
+	ISCSI_NET_PARAM_VLAN_ENABLED		= 15,
+	ISCSI_NET_PARAM_IFACE_TYPE		= 16,
+	ISCSI_NET_PARAM_IFACE_NAME		= 17,
 };
 
 /*