364 lines
12 KiB
C
364 lines
12 KiB
C
/****************************************************************************
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* wireless/ieee802154/mac802154_data.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 <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <string.h>
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#include <nuttx/mm/iob.h>
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#include "mac802154.h"
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#include "mac802154_internal.h"
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#include "mac802154_data.h"
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#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mac802154_req_data
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*
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* Description:
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* The MCPS-DATA.request primitive requests the transfer of a data SPDU
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* (i.e., MSDU) from a local SSCS entity to a single peer SSCS entity.
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* Confirmation is returned via the
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* struct mac802154_maccb_s->conf_data callback.
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*
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****************************************************************************/
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int mac802154_req_data(MACHANDLE mac,
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FAR const struct ieee802154_frame_meta_s *meta,
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FAR struct iob_s *frame)
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{
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FAR struct ieee802154_privmac_s *priv =
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(FAR struct ieee802154_privmac_s *)mac;
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FAR struct ieee802154_txdesc_s *txdesc;
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uint16_t *frame_ctrl;
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uint8_t mhr_len = 3;
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int ret;
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wlinfo("Accepting outbound frame io_len=%u io_offset=%u\n",
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frame->io_len, frame->io_offset);
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/* Check the required frame size */
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if (frame->io_len > IEEE802154_MAX_PHY_PACKET_SIZE)
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{
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return -E2BIG;
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}
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/* Cast the first two bytes of the IOB to a uint16_t frame control field */
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frame_ctrl = (FAR uint16_t *)&frame->io_data[0];
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/* Ensure we start with a clear frame control field */
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*frame_ctrl = 0;
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/* Set the frame type to Data */
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*frame_ctrl |= IEEE802154_FRAME_DATA << IEEE802154_FRAMECTRL_SHIFT_FTYPE;
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/* If the msduLength is greater than aMaxMACSafePayloadSize, the MAC
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* sublayer will set the Frame Version to one. [1] pg. 118.
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*/
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if ((frame->io_len - frame->io_offset) >
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IEEE802154_MAX_SAFE_MAC_PAYLOAD_SIZE)
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{
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*frame_ctrl |= (1 << IEEE802154_FRAMECTRL_SHIFT_VERSION);
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}
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/* If the TXOptions parameter specifies that an acknowledged transmission
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* is required, the AR field will be set appropriately, as described in
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* 5.1.6.4 [1] pg. 118.
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*/
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*frame_ctrl |= (meta->flags.ackreq << IEEE802154_FRAMECTRL_SHIFT_ACKREQ);
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/* If the destination address is present, copy the PAN ID and one of the
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* addresses, depending on mode, into the MHR.
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*/
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if (meta->destaddr.mode != IEEE802154_ADDRMODE_NONE)
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{
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IEEE802154_PANIDCOPY(&frame->io_data[mhr_len], meta->destaddr.panid);
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mhr_len += IEEE802154_PANIDSIZE;
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if (meta->destaddr.mode == IEEE802154_ADDRMODE_SHORT)
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{
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IEEE802154_SADDRCOPY(&frame->io_data[mhr_len],
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meta->destaddr.saddr);
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mhr_len += IEEE802154_SADDRSIZE;
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}
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else if (meta->destaddr.mode == IEEE802154_ADDRMODE_EXTENDED)
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{
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int index;
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/* The IEEE 802.15.4 Standard is confusing with regards to
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* byte-order for * extended address. More research discovers
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* that the extended address should be sent in reverse-canonical
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* form.
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*/
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for (index = IEEE802154_EADDRSIZE - 1; index >= 0; index--)
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{
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frame->io_data[mhr_len++] = meta->destaddr.eaddr[index];
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}
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}
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}
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/* Set the destination addr mode inside the frame control field */
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*frame_ctrl |= (meta->destaddr.mode << IEEE802154_FRAMECTRL_SHIFT_DADDR);
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/* From this point on, we need exclusive access to the privmac struct */
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ret = nxmutex_lock(&priv->lock);
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if (ret < 0)
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{
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/* Should only fail if interrupted by a signal */
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wlwarn("WARNING: nxmutex_lock failed: %d\n", ret);
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return ret;
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}
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/* If both destination and source addressing information is present, the
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* MAC sublayer shall compare the destination and source PAN identifiers.
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* [1] pg. 41.
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*/
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if (meta->srcmode != IEEE802154_ADDRMODE_NONE &&
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meta->destaddr.mode != IEEE802154_ADDRMODE_NONE)
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{
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/* If the PAN identifiers are identical, the PAN ID Compression field
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* shall be set to one, and the source PAN identifier shall be omitted
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* from the transmitted frame. [1] pg. 41.
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*/
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if (IEEE802154_PANIDCMP(meta->destaddr.panid, priv->addr.panid))
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{
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*frame_ctrl |= IEEE802154_FRAMECTRL_PANIDCOMP;
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}
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}
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if (meta->srcmode != IEEE802154_ADDRMODE_NONE)
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{
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/* If the destination address is not included, or if PAN ID Compression
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* is off, we need to include the Source PAN ID.
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*/
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if ((meta->destaddr.mode == IEEE802154_ADDRMODE_NONE) ||
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(!(*frame_ctrl & IEEE802154_FRAMECTRL_PANIDCOMP)))
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{
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IEEE802154_PANIDCOPY(&frame->io_data[mhr_len], priv->addr.panid);
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mhr_len += IEEE802154_PANIDSIZE;
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}
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if (meta->srcmode == IEEE802154_ADDRMODE_SHORT)
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{
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IEEE802154_SADDRCOPY(&frame->io_data[mhr_len], priv->addr.saddr);
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mhr_len += IEEE802154_SADDRSIZE;
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}
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else if (meta->srcmode == IEEE802154_ADDRMODE_EXTENDED)
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{
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int index;
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/* The IEEE 802.15.4 Standard is confusing with regards to
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* byte-order for * extended address. More research discovers
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* that the extended address should be sent in reverse-canonical
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* form.
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*/
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for (index = IEEE802154_EADDRSIZE - 1; index >= 0; index--)
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{
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frame->io_data[mhr_len++] = priv->addr.eaddr[index];
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}
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}
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}
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else
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{
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/* If this device is not the PAN coordinator, it shouldn't be sending
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* frames with a source address mode of NONE
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*/
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if (priv->devmode != IEEE802154_DEVMODE_PANCOORD)
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{
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ret = -EINVAL;
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goto errout_with_lock;
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}
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}
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/* Set the source addr mode inside the frame control field */
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*frame_ctrl |= (meta->srcmode << IEEE802154_FRAMECTRL_SHIFT_SADDR);
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/* Each time a data or a MAC command frame is generated, the MAC sublayer
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* shall copy the value of macDSN into the Sequence Number field of the MHR
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* of the outgoing frame and then increment it by one. [1] pg. 40.
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*/
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frame->io_data[2] = priv->dsn++;
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/* The MAC header we just created must never have exceeded where the app
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* data starts. This should never happen since the offset should have
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* been set via the same logic to calculate the header length as the logic
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* here that created the header
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*/
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wlinfo("mhr_len=%u\n", mhr_len);
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DEBUGASSERT(mhr_len == frame->io_offset);
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/* Allocate the txdesc, waiting if necessary, allow interruptions */
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ret = mac802154_txdesc_alloc(priv, &txdesc);
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if (ret < 0)
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{
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/* Should only fail if interrupted by a signal while re-acquiring
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* lock. So the lock is not held if a failure is returned.
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*/
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wlwarn("WARNING: mac802154_txdesc_alloc failed: %d\n", ret);
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goto errout_with_lock;
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}
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/* Set the offset to 0 to include the header ( we do not want to
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* modify the frame until AFTER the last place that -EINTR could
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* be returned and could generate a retry. Subsequent error returns
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* are fatal and no retry should occur.
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*/
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frame->io_offset = 0;
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/* Then initialize the TX descriptor */
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txdesc->conf->handle = meta->handle;
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txdesc->frame = frame;
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txdesc->frametype = IEEE802154_FRAME_DATA;
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txdesc->ackreq = meta->flags.ackreq;
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/* If the TxOptions parameter specifies that a GTS transmission is
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* required, the MAC sublayer will determine whether it has a valid GTS as
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* described 5.1.7.3. If a valid GTS could not be found, the MAC sublayer
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* will discard the MSDU. If a valid GTS was found, the MAC sublayer will
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* defer, if necessary, until the GTS. If the TxOptions parameter specifies
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* that a GTS transmission is not required, the MAC sublayer will transmit
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* the MSDU using either slotted CSMA-CA in the CAP for a beacon-enabled
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* PAN or unslotted CSMA-CA for a nonbeacon-enabled PAN. Specifying a GTS
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* transmission in the TxOptions parameter overrides an indirect
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* transmission request. [1] pg. 118.
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*/
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if (meta->flags.usegts)
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{
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/* TODO:
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* Support GTS transmission. This should just change where we link
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* the transaction. Instead of going in the CSMA transaction list, it
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* should be linked to the GTS' transaction list. We'll need to check
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* if the GTS is valid, and then find the GTS, before linking.
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* Note, we also don't have to try and kick-off any transmission here.
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*/
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ret = -ENOTSUP;
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goto errout_with_txdesc;
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}
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else
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{
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/* If the TxOptions parameter specifies that an indirect transmission
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* is required and this primitive is received by the MAC sublayer of a
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* coordinator, the data frame is sent using indirect transmission, as
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* described in 5.1.5 and 5.1.6.3. [1]
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*/
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if (meta->flags.indirect)
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{
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/* If the TxOptions parameter specifies that an indirect
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* transmission is required and if the device receiving this
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* primitive is not a coordinator, the destination address is not
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* present, or the TxOptions parameter also specifies a
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* GTS transmission, the indirect transmission option will be
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* ignored. [1]
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*
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* NOTE: We don't just ignore the parameter. Instead, we throw an
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* error, since this really shouldn't be happening.
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*/
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if (priv->devmode >= IEEE802154_DEVMODE_COORD &&
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meta->destaddr.mode != IEEE802154_ADDRMODE_NONE)
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{
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/* Copy in a reference to the destination address to assist in
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* searching when data is requested.
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*/
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memcpy(&txdesc->destaddr, &meta->destaddr,
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sizeof(struct ieee802154_addr_s));
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mac802154_setupindirect(priv, txdesc);
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nxmutex_unlock(&priv->lock);
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}
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else
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{
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ret = -EINVAL;
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goto errout_with_txdesc;
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}
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}
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else
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{
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/* Link the transaction into the CSMA transaction list */
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sq_addlast((FAR sq_entry_t *)txdesc, &priv->csma_queue);
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/* We no longer need to have the MAC layer locked. */
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nxmutex_unlock(&priv->lock);
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/* Notify the radio driver that there is data available */
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priv->radio->txnotify(priv->radio, false);
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}
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}
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return OK;
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errout_with_txdesc:
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/* Free TX the descriptor, but preserve the IOB. */
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txdesc->frame = NULL;
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mac802154_txdesc_free(priv, txdesc);
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errout_with_lock:
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nxmutex_unlock(&priv->lock);
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return ret;
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}
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/****************************************************************************
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* Internal MAC Functions
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****************************************************************************/
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