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