[efi] Add efi_path_mac() to parse a MAC address from an EFI device path
Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/include/ipxe/efi/efi_path.h b/src/include/ipxe/efi/efi_path.h
index 503bd43..57fce40 100644
--- a/src/include/ipxe/efi/efi_path.h
+++ b/src/include/ipxe/efi/efi_path.h
@@ -43,6 +43,7 @@
extern EFI_DEVICE_PATH_PROTOCOL *
efi_path_end ( EFI_DEVICE_PATH_PROTOCOL *path );
extern size_t efi_path_len ( EFI_DEVICE_PATH_PROTOCOL *path );
+extern void * efi_path_mac ( EFI_DEVICE_PATH_PROTOCOL *path );
extern unsigned int efi_path_vlan ( EFI_DEVICE_PATH_PROTOCOL *path );
extern int efi_path_guid ( EFI_DEVICE_PATH_PROTOCOL *path, union uuid *uuid );
extern struct uri * efi_path_uri ( EFI_DEVICE_PATH_PROTOCOL *path );
diff --git a/src/interface/efi/efi_path.c b/src/interface/efi/efi_path.c
index 4e37d24..23f1bb8 100644
--- a/src/interface/efi/efi_path.c
+++ b/src/interface/efi/efi_path.c
@@ -112,6 +112,30 @@
}
/**
+ * Get MAC address from device path
+ *
+ * @v path Device path
+ * @ret mac MAC address, or NULL if not found
+ */
+void * efi_path_mac ( EFI_DEVICE_PATH_PROTOCOL *path ) {
+ EFI_DEVICE_PATH_PROTOCOL *next;
+ MAC_ADDR_DEVICE_PATH *mac;
+
+ /* Search for MAC address path */
+ for ( ; ( next = efi_path_next ( path ) ) ; path = next ) {
+ if ( ( path->Type == MESSAGING_DEVICE_PATH ) &&
+ ( path->SubType == MSG_MAC_ADDR_DP ) ) {
+ mac = container_of ( path, MAC_ADDR_DEVICE_PATH,
+ Header );
+ return &mac->MacAddress;
+ }
+ }
+
+ /* No MAC address found */
+ return NULL;
+}
+
+/**
* Get VLAN tag from device path
*
* @v path Device path
