8a63d29c6e
Allocate the device buffer only if the protocol really need to send data. not all protocols require the driver to prepare additional iob before sending, especially UDP, each iob reserves l2/l3 header in advance after prepare write buffer, net device could reuse this entry to send directly Signed-off-by: chao an <anchao@xiaomi.com>
107 lines
3.5 KiB
C
107 lines
3.5 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 <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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unsigned int limit = NETDEV_PKTSIZE(dev) -
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NET_LL_HDRLEN(dev) - offset;
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if (dev == NULL || len == 0 || len > limit)
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{
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nerr("ERROR: devif_send fail: %p, sndlen: %u, pktlen: %u\n",
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dev, len, limit);
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return;
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}
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/* Copy in iob to target device buffer */
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if (len <= iob_navail(false) * CONFIG_IOB_BUFSIZE)
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{
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/* Prepare device buffer before poll callback */
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if (netdev_iob_prepare(dev, false, 0) != OK)
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{
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return;
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}
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iob_update_pktlen(dev->d_iob, offset);
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dev->d_sndlen = iob_trycopyin(dev->d_iob, buf, len, offset, false);
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}
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else
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{
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dev->d_sndlen = 0;
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}
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if (dev->d_sndlen != len)
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{
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netdev_iob_release(dev);
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dev->d_sndlen = 0;
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}
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}
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