[vlan] Add support for IEEE 802.1Q VLANs

Originally-implemented-by: michael-dev@fami-braun.de
Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/include/ipxe/vlan.h b/src/include/ipxe/vlan.h
new file mode 100644
index 000000000..86d78bed0
--- /dev/null
+++ b/src/include/ipxe/vlan.h
@@ -0,0 +1,66 @@
+#ifndef _IPXE_VLAN_H
+#define _IPXE_VLAN_H
+
+/**
+ * @file
+ *
+ * Virtual LANs
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** A VLAN header */
+struct vlan_header {
+	/** Tag control information */
+	uint16_t tci;
+	/** Encapsulated protocol */
+	uint16_t net_proto;
+} __attribute__ (( packed ));
+
+/**
+ * Extract VLAN tag from tag control information
+ *
+ * @v tci		Tag control information
+ * @ret tag		VLAN tag
+ */
+#define VLAN_TAG( tci ) ( (tci) & 0x0fff )
+
+/**
+ * Extract VLAN priority from tag control information
+ *
+ * @v tci		Tag control information
+ * @ret priority	Priority
+ */
+#define VLAN_PRIORITY( tci ) ( (tci) >> 13 )
+
+/**
+ * Construct VLAN tag control information
+ *
+ * @v tag		VLAN tag
+ * @v priority		Priority
+ * @ret tci		Tag control information
+ */
+#define VLAN_TCI( tag, priority ) ( ( (priority) << 13 ) | (tag) )
+
+/**
+ * Check VLAN tag is valid
+ *
+ * @v tag		VLAN tag
+ * @ret is_valid	VLAN tag is valid
+ */
+#define VLAN_TAG_IS_VALID( tag ) ( ( (tag) >= 1 ) && ( (tag) < 0xfff ) )
+
+/**
+ * Check VLAN priority is valid
+ *
+ * @v priority		VLAN priority
+ * @ret is_valid	VLAN priority is valid
+ */
+#define VLAN_PRIORITY_IS_VALID( priority ) ( (priority) <= 7 )
+
+extern int vlan_create ( struct net_device *trunk, unsigned int tag,
+			 unsigned int priority );
+extern int vlan_destroy ( struct net_device *netdev );
+
+#endif /* _IPXE_VLAN_H */