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