100 lines
3.4 KiB
C
100 lines
3.4 KiB
C
/****************************************************************************
|
|
* net/devif/devif_send.c
|
|
*
|
|
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Based in part on uIP which also has a BSD stylie license:
|
|
*
|
|
* Author: Adam Dunkels <adam@dunkels.com>
|
|
* Copyright (c) 2001-2003, Adam Dunkels.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
#include "devif/devif.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: devif_send
|
|
*
|
|
* Description:
|
|
* Called from socket logic in response to a xmit or poll request from the
|
|
* the network interface driver.
|
|
*
|
|
* Assumptions:
|
|
* The network is locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void devif_send(FAR struct net_driver_s *dev, FAR const void *buf,
|
|
int len, unsigned int offset)
|
|
{
|
|
unsigned int limit = NETDEV_PKTSIZE(dev) -
|
|
NET_LL_HDRLEN(dev) - offset;
|
|
|
|
if (dev == NULL || len == 0 || len > limit)
|
|
{
|
|
nerr("ERROR: devif_send fail: %p, sndlen: %u, pktlen: %u\n",
|
|
dev, len, limit);
|
|
return;
|
|
}
|
|
|
|
iob_update_pktlen(dev->d_iob, offset);
|
|
|
|
/* Copy in iob to target device buffer */
|
|
|
|
if (len <= iob_navail(false) * CONFIG_IOB_BUFSIZE)
|
|
{
|
|
dev->d_sndlen = iob_trycopyin(dev->d_iob, buf, len, offset, false);
|
|
}
|
|
else
|
|
{
|
|
dev->d_sndlen = 0;
|
|
}
|
|
|
|
if (dev->d_sndlen != len)
|
|
{
|
|
netdev_iob_release(dev);
|
|
dev->d_sndlen = 0;
|
|
}
|
|
}
|