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>
158 lines
4.6 KiB
C
158 lines
4.6 KiB
C
/****************************************************************************
|
|
* net/netdev/netdev_iob.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <debug.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/net/netdev.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: netdev_iob_prepare
|
|
*
|
|
* Description:
|
|
* Prepare data buffer for a given NIC
|
|
* The iob offset will be updated to l2 gruard size by default:
|
|
* ----------------------------------------------------------------
|
|
* | iob entry |
|
|
* ---------------------------------------------------------------|
|
|
* |<--- CONFIG_NET_LL_GUARDSIZE -->|<--- io_len/io_pktlen(0) --->|
|
|
* ---------------------------------------------------------------|
|
|
*
|
|
* Assumptions:
|
|
* The caller has locked the network.
|
|
*
|
|
* Returned Value:
|
|
* A non-zero copy is returned on success.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int netdev_iob_prepare(FAR struct net_driver_s *dev, bool throttled,
|
|
unsigned int timeout)
|
|
{
|
|
/* Prepare iob buffer */
|
|
|
|
if (dev->d_iob == NULL)
|
|
{
|
|
dev->d_iob = net_iobtimedalloc(false, timeout);
|
|
if (dev->d_iob == NULL && throttled)
|
|
{
|
|
dev->d_iob = net_iobtimedalloc(true, timeout);
|
|
}
|
|
}
|
|
|
|
if (dev->d_iob == NULL)
|
|
{
|
|
nwarn("WARNING: IOB Prepare failed for dev %s!\n", dev->d_ifname);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Set the device buffer to l2 */
|
|
|
|
dev->d_buf = &dev->d_iob->io_data[CONFIG_NET_LL_GUARDSIZE -
|
|
NET_LL_HDRLEN(dev)];
|
|
|
|
/* Update l2 gruard size */
|
|
|
|
iob_reserve(dev->d_iob, CONFIG_NET_LL_GUARDSIZE);
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netdev_iob_replace
|
|
*
|
|
* Description:
|
|
* Replace buffer resources for a given NIC
|
|
*
|
|
* Assumptions:
|
|
* The caller has locked the network and new iob is prepared with
|
|
* l2 gruard size as offset.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netdev_iob_replace(FAR struct net_driver_s *dev, FAR struct iob_s *iob)
|
|
{
|
|
/* Release previous buffer */
|
|
|
|
netdev_iob_release(dev);
|
|
|
|
/* Set new buffer */
|
|
|
|
dev->d_iob = iob;
|
|
dev->d_buf = &dev->d_iob->io_data[CONFIG_NET_LL_GUARDSIZE -
|
|
NET_LL_HDRLEN(dev)];
|
|
dev->d_len = iob->io_pktlen;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netdev_iob_clear
|
|
*
|
|
* Description:
|
|
* Clean up buffer resources for a given NIC
|
|
*
|
|
* Assumptions:
|
|
* The caller has locked the network and dev->d_iob has been
|
|
* released or taken away.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netdev_iob_clear(FAR struct net_driver_s *dev)
|
|
{
|
|
/* Clear the device buffer */
|
|
|
|
dev->d_iob = NULL;
|
|
dev->d_buf = NULL;
|
|
dev->d_len = 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: netdev_iob_release
|
|
*
|
|
* Description:
|
|
* Release buffer resources for a given NIC
|
|
*
|
|
* Assumptions:
|
|
* The caller has locked the network.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void netdev_iob_release(FAR struct net_driver_s *dev)
|
|
{
|
|
/* Release device buffer */
|
|
|
|
if (dev->d_iob != NULL)
|
|
{
|
|
iob_free_chain(dev->d_iob);
|
|
dev->d_iob = NULL;
|
|
}
|
|
|
|
dev->d_buf = NULL;
|
|
}
|