1 files changed, 60 insertions, 0 deletions
diff --git a/c/src/libchip/network/dwmac-desc-com.c b/c/src/libchip/network/dwmac-desc-com.c
new file mode 100644
index 0000000000..ecbd2624db
--- /dev/null
+++ b/c/src/libchip/network/dwmac-desc-com.c
@@ -0,0 +1,60 @@
+/**
+ * @file
+ *
+ * @brief  DWMAC 10/100/1000 Common Descriptor Handling
+ *
+ * DWMAC 10/100/1000 on-chip Ethernet controllers.
+ * Functions which are common to normal and enhanced DMA descriptors.
+ */
+
+/*
+ * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include "dwmac-desc-com.h"
+
+#undef DWMAC_DESC_COM_DEBUG
+#ifdef DWMAC_DESC_COM_DEBUG
+#define DWMAC_DESC_COM_PRINT_DBG( fmt, args ... )  printk( fmt, ## args )
+#else
+#define DWMAC_DESC_COM_PRINT_DBG( fmt, args ... )  do { } while ( 0 )
+#endif
+
+struct mbuf *dwmac_desc_com_new_mbuf( dwmac_common_context *self ) {
+  struct  ifnet *ifp = &self->arpcom.ac_if;
+  struct  mbuf  *m   = NULL;
+
+
+  MGETHDR( m, M_DONTWAIT, MT_DATA );
+
+  if ( m != NULL ) {
+    MCLGET( m, M_DONTWAIT );
+
+    if ( m->m_ext.ext_buf != NULL ) {
+      if ( ( m->m_flags & M_EXT ) != 0 ) {
+        /* Set receive interface */
+        m->m_pkthdr.rcvif = ifp;
+
+        /* Make sure packet data will be aligned */
+        m->m_data = mtod( m, char * ) + ETHER_ALIGN;
+        return m;
+      } else {
+        m_free( m );
+      }
+    } else {
+      m_free( m );
+    }
+  }
+
+  return NULL;
+}