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/**
* @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;
}
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