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incubator-nuttx/wireless/ieee802154/mac802154.c

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/****************************************************************************
* wireless/ieee802154/mac802154.c
*
* Copyright (C) 2016 Sebastien Lorquet. All rights reserved.
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Copyright (C) 2017 Verge Inc. All rights reserved.
*
* Author: Sebastien Lorquet <sebastien@lorquet.fr>
* Author: Gregory Nutt <gnutt@nuttx.org>
* Author: Anthony Merlino <anthony@vergeaero.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdlib.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <string.h>
#include <nuttx/kmalloc.h>
#include <nuttx/wqueue.h>
#include <nuttx/semaphore.h>
#include <nuttx/mm/iob.h>
#include "mac802154.h"
#include "mac802154_internal.h"
#include "mac802154_assoc.h"
#include "mac802154_scan.h"
#include "mac802154_data.h"
#include "mac802154_poll.h"
#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
#include <nuttx/wireless/ieee802154/ieee802154_radio.h>
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Data structure pools and allocation helpers */
static void mac802154_resetqueues(FAR struct ieee802154_privmac_s *priv);
/* IEEE 802.15.4 PHY Interface OPs */
static int mac802154_radiopoll(FAR const struct ieee802154_radiocb_s *radiocb,
bool gts, FAR struct ieee802154_txdesc_s **tx_desc);
static void mac802154_txdone(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *tx_desc);
static void mac802154_txdone_worker(FAR void *arg);
static void mac802154_rxframe(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_data_ind_s *ind);
static void mac802154_rxframe_worker(FAR void *arg);
static void mac802154_sfevent(FAR const struct ieee802154_radiocb_s *radiocb,
enum ieee802154_sfevent_e sfevent);
static void mac802154_purge_worker(FAR void *arg);
static void mac802154_rxdatareq(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind);
static void mac802154_rxdataframe(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind);
static void mac802154_rxbeaconframe(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind);
static void mac802154_notify_worker(FAR void *arg);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mac802154_resetqueues
*
* Description:
* Initializes the various queues used in the MAC layer. Called on creation
* of MAC.
*
****************************************************************************/
static void mac802154_resetqueues(FAR struct ieee802154_privmac_s *priv)
{
int i;
sq_init(&priv->txdone_queue);
sq_init(&priv->csma_queue);
sq_init(&priv->gts_queue);
sq_init(&priv->indirect_queue);
sq_init(&priv->dataind_queue);
sq_init(&priv->primitive_queue);
/* Initialize the tx descriptor allocation pool */
sq_init(&priv->txdesc_queue);
for (i = 0; i < CONFIG_MAC802154_NTXDESC; i++)
{
sq_addlast((FAR sq_entry_t *)&priv->txdesc_pool[i], &priv->txdesc_queue);
}
nxsem_init(&priv->txdesc_sem, 0, CONFIG_MAC802154_NTXDESC);
}
/****************************************************************************
* Name: mac802154_txdesc_pool
*
* Description:
* This function allocates a tx descriptor and the dependent primitive (data
* confirmation) from the free list. The primitive and tx descriptor must be
* freed seperately.
*
* Assumptions:
* priv MAC struct is locked when calling.
*
* Notes:
* If any of the semaphore waits inside this function get interrupted, the
* function will release the MAC layer. If this function returns -EINTR, the
* calling code should NOT release the MAC semaphore.
*
****************************************************************************/
int mac802154_txdesc_alloc(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_txdesc_s **txdesc,
bool allow_interrupt)
{
int ret;
FAR struct ieee802154_primitive_s *primitive;
/* Try and take a count from the semaphore. If this succeeds, we have
* "reserved" the structure, but still need to unlink it from the free list.
* The MAC is already locked, so there shouldn't be any other conflicting calls
*/
ret = nxsem_trywait(&priv->txdesc_sem);
if (ret == OK)
{
*txdesc = (FAR struct ieee802154_txdesc_s *)sq_remfirst(&priv->txdesc_queue);
}
else
{
/* Unlock MAC so that other work can be done to free a notification */
mac802154_unlock(priv)
/* Take a count from the tx desc semaphore, waiting if necessary. We
* only return from here with an error if we are allowing interruptions
* and we received a signal */
ret = mac802154_takesem(&priv->txdesc_sem, allow_interrupt);
if (ret < 0)
{
/* MAC is already released */
wlwarn("WARNING: mac802154_takesem failed: %d\n", ret);
return -EINTR;
}
/* If we've taken a count from the semaphore, we have "reserved" the struct
* but now we need to pop it off of the free list. We need to re-lock the
* MAC in order to ensure this happens correctly.
*/
ret = mac802154_lock(priv, allow_interrupt);
if (ret < 0)
{
wlwarn("WARNING: mac802154_takesem failed: %d\n", ret);
mac802154_givesem(&priv->txdesc_sem);
return -EINTR;
}
/* We can now safely unlink the next free structure from the free list */
*txdesc = (FAR struct ieee802154_txdesc_s *)sq_remfirst(&priv->txdesc_queue);
}
/* We have now successfully allocated the tx descriptor. Now we need to allocate
* the primitive for the data confirmation that gets passed along with the
* tx descriptor. These are allocated together, but not freed together.
*/
primitive = ieee802154_primitive_allocate();
(*txdesc)->purgetime = 0;
(*txdesc)->retrycount = priv->maxretries;
(*txdesc)->conf = &primitive->u.dataconf;
return OK;
}
/****************************************************************************
* Name: mac802154_createdatareq
*
* Description:
* Internal function used by various parts of the MAC layer. This function
* allocates an IOB, populates the frame according to input args, and links
* the IOB into the provided tx descriptor.
*
* Assumptions:
* Called with the MAC locked
*
****************************************************************************/
void mac802154_createdatareq(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_addr_s *coordaddr,
enum ieee802154_addrmode_e srcmode,
FAR struct ieee802154_txdesc_s *txdesc)
{
FAR struct iob_s *iob;
/* The only node allowed to use a source address of none is the PAN Coordinator.
* PAN coordinators should not be sending data request commans.
*/
DEBUGASSERT(srcmode != IEEE802154_ADDRMODE_NONE);
/* Allocate an IOB to put the frame in */
iob = iob_alloc(false);
DEBUGASSERT(iob != NULL);
iob->io_flink = NULL;
iob->io_len = 0;
iob->io_offset = 0;
iob->io_pktlen = 0;
/* Set the frame control fields */
iob->io_data[0] = 0;
iob->io_data[1] = 0;
IEEE802154_SETACKREQ(iob->io_data, 0);
IEEE802154_SETFTYPE(iob->io_data, 0, IEEE802154_FRAME_COMMAND);
IEEE802154_SETDADDRMODE(iob->io_data, 0, coordaddr->mode);
IEEE802154_SETSADDRMODE(iob->io_data, 0, srcmode);
iob->io_len = 2;
/* Each time a data or a MAC command frame is generated, the MAC sublayer
* shall copy the value of macDSN into the Sequence Number field of the
* MHR of the outgoing frame and then increment it by one. [1] pg. 40.
*/
iob->io_data[iob->io_len++] = priv->dsn++;
/* If the destination address is present, copy the PAN ID and one of the
* addresses, depending on mode, into the MHR.
*/
if (coordaddr->mode != IEEE802154_ADDRMODE_NONE)
{
mac802154_putpanid(iob, coordaddr->panid);
if (coordaddr->mode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_putsaddr(iob, coordaddr->saddr);
}
else if (coordaddr->mode == IEEE802154_ADDRMODE_EXTENDED)
{
mac802154_puteaddr(iob, coordaddr->eaddr);
}
}
/* If the Destination Addressing Mode field is set to indicate that
* destination addressing information is not present, the PAN ID Compression
* field shall be set to zero and the source PAN identifier shall contain the
* value of macPANId. Otherwise, the PAN ID Compression field shall be set to
* one. In this case and in accordance with the PAN ID Compression field, the
* Destination PAN Identifier field shall contain the value of macPANId, while
* the Source PAN Identifier field shall be omitted. [1] pg. 72
*/
if (coordaddr->mode != IEEE802154_ADDRMODE_NONE &&
IEEE802154_PANIDCMP(coordaddr->panid, priv->addr.panid))
{
IEEE802154_SETPANIDCOMP(iob->io_data, 0);
}
else
{
mac802154_putpanid(iob, priv->addr.panid);
}
if (srcmode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_putsaddr(iob, priv->addr.saddr);
}
else if (srcmode == IEEE802154_ADDRMODE_EXTENDED)
{
mac802154_puteaddr(iob, priv->addr.eaddr);
}
/* Copy in the Command Frame Identifier */
iob->io_data[iob->io_len++] = IEEE802154_CMD_DATA_REQ;
/* Copy the IOB reference to the descriptor */
txdesc->frame = iob;
txdesc->frametype = IEEE802154_FRAME_COMMAND;
/* Save a copy of the destination addressing information into the tx descriptor.
* We only do this for commands to help with handling their progession.
*/
memcpy(&txdesc->destaddr, &coordaddr, sizeof(struct ieee802154_addr_s));
/* Save a reference of the tx descriptor */
priv->cmd_desc = txdesc;
}
/****************************************************************************
* Name: mac802154_notify
*
* Description:
* Queue the primitive in the queue and queue work on the LPWORK
* queue if is not already scheduled.
*
* Assumptions:
* Called with the MAC locked
*
****************************************************************************/
void mac802154_notify(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_primitive_s *primitive)
{
sq_addlast((FAR sq_entry_t *)primitive, &priv->primitive_queue);
if (work_available(&priv->notifwork))
{
work_queue(LPWORK, &priv->notifwork, mac802154_notify_worker,
(FAR void *)priv, 0);
}
}
/****************************************************************************
* Name: mac802154_notify_worker
*
* Description:
* Pop each primitive off the queue and call the registered
* callbacks. There is special logic for handling ieee802154_data_ind_s.
*
****************************************************************************/
static void mac802154_notify_worker(FAR void *arg)
{
FAR struct ieee802154_privmac_s *priv = (FAR struct ieee802154_privmac_s *)arg;
FAR struct mac802154_maccb_s *cb;
FAR struct ieee802154_primitive_s *primitive;
int ret;
mac802154_lock(priv, false);
primitive =
(FAR struct ieee802154_primitive_s *)sq_remfirst(&priv->primitive_queue);
mac802154_unlock(priv);
while (primitive != NULL)
{
/* Data indications are a special case since the frame can only be passed to
* one place. The return value of the notify call is used to accept or reject
* the primitive. In the case of the data indication, there can only be one
* accept. Callbacks are stored in order of there receiver priority ordered
* when the callbacks are bound in mac802154_bind().
*/
if (primitive->type == IEEE802154_PRIMITIVE_IND_DATA)
{
bool dispose = true;
primitive->nclients = 1;
for (cb = priv->cb; cb != NULL; cb = cb->flink)
{
if (cb->notify != NULL)
{
ret = cb->notify(cb, primitive);
if (ret >= 0)
{
/* The receiver accepted and disposed of the frame and it's
* meta-data. We are done.
*/
dispose = false;
break;
}
}
}
if (dispose)
{
iob_free(primitive->u.dataind.frame);
ieee802154_primitive_free(primitive);
}
}
else
{
/* Set the number of clients count so that the primitive resources will be
* preserved until all clients are finished with it.
*/
primitive->nclients = priv->nclients;
/* Try to notify every registered MAC client */
for (cb = priv->cb; cb != NULL; cb = cb->flink)
{
if (cb->notify != NULL)
{
ret = cb->notify(cb, primitive);
if (ret < 0)
{
ieee802154_primitive_free(primitive);
}
}
else
{
ieee802154_primitive_free(primitive);
}
}
}
/* Get the next primitive then loop */
mac802154_lock(priv, false);
primitive =
(FAR struct ieee802154_primitive_s *)sq_remfirst(&priv->primitive_queue);
mac802154_unlock(priv);
}
}
/****************************************************************************
* Name: mac802154_updatebeacon
*
* Description:
* This function is called in the following scenarios:
* - The MAC receives a START.request primitive
* - Upon receiving the IEEE802154_SFEVENT_ENDOFACTIVE event from the
* radio layer, the MAC checks the bf_update flag and if set calls this
* function. The bf_update flag is set when various attributes that
* effect the beacon are updated.
*
* Internal function used by various parts of the MAC layer. This function
* uses the various MAC attributes to update the beacon frame. It loads the
* inactive beacon frame structure and then notifies the radio layer of the
* new frame. the provided tx descriptor in the indirect list and manages the
* scheduling for purging the transaction if it does not get extracted in
* time.
*
* Assumptions:
* Called with the MAC locked
*
****************************************************************************/
void mac802154_updatebeacon(FAR struct ieee802154_privmac_s *priv)
{
FAR struct ieee802154_txdesc_s *txdesc;
uint8_t pendaddrspec_ind;
uint8_t pendeaddr = 0;
uint8_t pendsaddr = 0;
/* Switch the buffer */
priv->bf_ind = !priv->bf_ind;
/* Get a local reference to the beacon frame */
FAR struct ieee802154_beaconframe_s *beacon = &priv->beaconframe[priv->bf_ind];
/* Clear the frame control fields */
beacon->bf_data[0] = 0;
beacon->bf_data[1] = 0;
beacon->bf_len = 2;
IEEE802154_SETFTYPE(beacon->bf_data, 0, IEEE802154_FRAME_BEACON);
/* Check if there is a broadcast message pending, if there is, we must set
* the frame pending bit to 1.
*/
/* TODO: handle broadcast frame */
DEBUGASSERT(priv->addr.mode != IEEE802154_ADDRMODE_NONE);
IEEE802154_SETDADDRMODE(beacon->bf_data, 0, IEEE802154_ADDRMODE_NONE);
IEEE802154_SETSADDRMODE(beacon->bf_data, 0, priv->addr.mode);
IEEE802154_SETVERSION(beacon->bf_data, 0, 1);
/* The beacon sequence number has to be taken care of by the radio layer, since
* we only want to update the whole frame when more changes than just the bsn.
*/
beacon->bf_len++;
IEEE802154_PANIDCOPY(&beacon->bf_data[beacon->bf_len], priv->addr.panid);
beacon->bf_len += IEEE802154_PANIDSIZE;
if (priv->addr.mode == IEEE802154_ADDRMODE_SHORT)
{
IEEE802154_SADDRCOPY(&beacon->bf_data[beacon->bf_len], priv->addr.saddr);
beacon->bf_len += IEEE802154_SADDRSIZE;
}
else
{
IEEE802154_EADDRCOPY(&beacon->bf_data[beacon->bf_len], priv->addr.eaddr);
beacon->bf_len += IEEE802154_EADDRSIZE;
}
/* Clear the superframe specification, then set the appropriate bits */
beacon->bf_data[beacon->bf_len] = 0;
beacon->bf_data[beacon->bf_len + 1] = 0;
IEEE802154_SETBEACONORDER(beacon->bf_data, beacon->bf_len,
priv->sfspec.beaconorder);
IEEE802154_SETSFORDER(beacon->bf_data, beacon->bf_len,
priv->sfspec.sforder);
IEEE802154_SETFINCAPSLOT(beacon->bf_data, beacon->bf_len,
priv->sfspec.final_capslot);
if (priv->sfspec.ble)
{
IEEE802154_SETBLE(beacon->bf_data, beacon->bf_len);
}
if (priv->sfspec.pancoord)
{
IEEE802154_SETPANCOORD(beacon->bf_data, beacon->bf_len);
}
if (priv->sfspec.assocpermit)
{
IEEE802154_SETASSOCPERMIT(beacon->bf_data, beacon->bf_len);
}
beacon->bf_len += 2;
/* TODO: Handle GTS properly, for now, we just set the descriptor count to
* zero and specify that we do not permit GTS requests */
beacon->bf_data[beacon->bf_len++] = 0;
/* TODO: Add GTS List here */
/* Skip the pending address specification field for now */
pendaddrspec_ind = beacon->bf_len++;
txdesc = (FAR struct ieee802154_txdesc_s *)sq_peek(&priv->indirect_queue);
while(txdesc != NULL)
{
if (txdesc->destaddr.mode == IEEE802154_ADDRMODE_SHORT)
{
pendsaddr++;
IEEE802154_SADDRCOPY(&beacon->bf_data[beacon->bf_len], txdesc->destaddr.saddr);
beacon->bf_len += IEEE802154_SADDRSIZE;
}
else if (txdesc->destaddr.mode == IEEE802154_ADDRMODE_EXTENDED)
{
pendeaddr++;
IEEE802154_EADDRCOPY(&beacon->bf_data[beacon->bf_len], txdesc->destaddr.eaddr);
beacon->bf_len += IEEE802154_EADDRSIZE;
}
/* Check if we are up to 7 addresses yet */
if ((pendsaddr + pendeaddr) == 7)
{
break;
}
/* Get the next pending indirect transation */
txdesc = (FAR struct ieee802154_txdesc_s *)sq_next((FAR sq_entry_t *)txdesc);
}
/* At this point, we know how many of each transaction we have, we can setup
* the Pending Address Specification field
*/
beacon->bf_data[pendaddrspec_ind] = (pendsaddr & 0x07) | ((pendeaddr << 4) & 0x70);
/* Copy in the beacon payload */
memcpy(&beacon->bf_data[beacon->bf_len], priv->beaconpayload,
priv->beaconpayloadlength);
beacon->bf_len += priv->beaconpayloadlength;
priv->beaconupdate = false;
}
/****************************************************************************
* Name: mac802154_setupindirect
*
* Description:
* Internal function used by various parts of the MAC layer. This function
* places the provided tx descriptor in the indirect list and manages the
* scheduling for purging the transaction if it does not get extracted in
* time.
*
* Assumptions:
* Called with the MAC locked
*
****************************************************************************/
void mac802154_setupindirect(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_txdesc_s *txdesc)
{
uint32_t ticks;
uint32_t symbols;
/* Link the tx descriptor into the list */
sq_addlast((FAR sq_entry_t *)txdesc, &priv->indirect_queue);
/* Update the timestamp for purging the transaction */
/* The maximum time (in unit periods) that a transaction is stored by a
* coordinator and indicated in its beacon. The unit period is governed by
* macBeaconOrder, BO, as follows: For 0 ≤ BO ≤ 14, the unit period will be
* aBaseSuperframeDuration × 2 BO . For BO = 15, the unit period will be
* aBaseSuperframeDuration. [1] pg. 129
*/
if (priv->sfspec.beaconorder < 15)
{
symbols = priv->trans_persisttime *
(IEEE802154_BASE_SUPERFRAME_DURATION * (1 << priv->sfspec.beaconorder));
}
else
{
symbols = priv->trans_persisttime * IEEE802154_BASE_SUPERFRAME_DURATION;
}
ticks = mac802154_symtoticks(priv, symbols);
txdesc->purgetime = clock_systimer() + ticks;
/* Make sure the beacon gets updated */
if (priv->sfspec.beaconorder < 15)
{
priv->beaconupdate = true;
}
/* Check to see if the purge indirect timer is scheduled. If it is, when the
* timer fires, it will schedule the next purge timer event. Inherently, the
* queue will be in order of which transaction needs to be purged next.
*
* If the purge indirect timer has not been scheduled, schedule it for when
* this transaction should expire.
*/
if (work_available(&priv->purge_work))
{
work_queue(HPWORK, &priv->purge_work, mac802154_purge_worker,
(FAR void *)priv, ticks);
}
}
/****************************************************************************
* Name: mac802154_purge_worker
*
* Description:
* Worker function scheduled in order to purge expired indirect transactions.
* The first element in the list should always be removed. The list is searched
* and transactions are removed until a transaction has not yet expired. Then
* if there are any remaining transactions, the work function is rescheduled
* for the next expiring transaction.
*
****************************************************************************/
static void mac802154_purge_worker(FAR void *arg)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)arg;
FAR struct ieee802154_txdesc_s *txdesc;
/* Get exclusive access to the driver structure. We don't care about any
* signals so don't allow interruptions
*/
mac802154_lock(priv, false);
while (1)
{
/* Pop transactions off indirect queue until the transaction timeout has not
* passed.
*/
txdesc = (FAR struct ieee802154_txdesc_s *)sq_peek(&priv->indirect_queue);
if (txdesc == NULL)
{
break;
}
/* Should probably check a little ahead and remove the transaction if it is within
* a certain number of clock ticks away. There is no since in scheduling the
* timer to expire in only a few ticks.
*/
if (clock_systimer() >= txdesc->purgetime)
{
/* Unlink the transaction */
sq_remfirst(&priv->indirect_queue);
/* Free the IOB, the notification, and the tx descriptor */
iob_free(txdesc->frame);
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)txdesc->conf);
mac802154_txdesc_free(priv, txdesc);
priv->beaconupdate = true;
wlinfo("Indirect TX purged");
}
else
{
/* Reschedule the transaction for the next timeout */
work_queue(HPWORK, &priv->purge_work, mac802154_purge_worker,
(FAR void *)priv, txdesc->purgetime - clock_systimer());
break;
}
}
mac802154_unlock(priv);
}
/****************************************************************************
* Name: mac802154_radiopoll
*
* Description:
* Called from the radio driver through the callback struct. This function is
* called when the radio has room for another transaction. If the MAC
* layer has a transaction, it copies it into the supplied buffer and
* returns the length. A descriptor is also populated with the transaction.
*
****************************************************************************/
static int mac802154_radiopoll(FAR const struct ieee802154_radiocb_s *radiocb,
bool gts, FAR struct ieee802154_txdesc_s **txdesc)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
DEBUGASSERT(cb != NULL && cb->priv != NULL);
priv = cb->priv;
/* Get exclusive access to the driver structure. Ignore any EINTR signals */
mac802154_lock(priv, false);
if (gts)
{
/* Check to see if there are any GTS transactions waiting */
*txdesc = (FAR struct ieee802154_txdesc_s *)sq_remfirst(&priv->gts_queue);
}
else
{
/* Check to see if there are any CSMA transactions waiting */
*txdesc = (FAR struct ieee802154_txdesc_s *)sq_remfirst(&priv->csma_queue);
}
mac802154_unlock(priv)
if (*txdesc != NULL)
{
return (*txdesc)->frame->io_len;
}
return 0;
}
/****************************************************************************
* Name: mac802154_txdone
*
* Description:
* Called from the radio driver through the callback struct. This function is
* called when the radio has completed a transaction. The txdesc passed gives
* provides information about the completed transaction including the original
* handle provided when the transaction was created and the status of the
* transaction. This function copies the descriptor and schedules work to
* handle the transaction without blocking the radio.
*
****************************************************************************/
static void mac802154_txdone(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *txdesc)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
DEBUGASSERT(cb != NULL && cb->priv != NULL);
priv = cb->priv;
/* Get exclusive access to the driver structure. We don't care about any
* signals so don't allow interruptions
*/
mac802154_lock(priv, false);
sq_addlast((FAR sq_entry_t *)txdesc, &priv->txdone_queue);
mac802154_unlock(priv)
/* Schedule work with the work queue to process the completion further */
if (work_available(&priv->tx_work))
{
work_queue(HPWORK, &priv->tx_work, mac802154_txdone_worker,
(FAR void *)priv, 0);
}
}
/****************************************************************************
* Name: mac802154_txdone_worker
*
* Description:
* Worker function scheduled from mac802154_txdone. This function pops any
* TX descriptors off of the list and calls the next highest layers callback
* to inform the layer of the completed transaction and the status of it.
*
****************************************************************************/
static void mac802154_txdone_worker(FAR void *arg)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)arg;
FAR struct ieee802154_txdesc_s *txdesc;
FAR struct ieee802154_primitive_s *primitive;
/* Get exclusive access to the driver structure. We don't care about any
* signals so don't allow interruptions
*/
mac802154_lock(priv, false);
while (1)
{
txdesc = (FAR struct ieee802154_txdesc_s *)sq_remfirst(&priv->txdone_queue);
if (txdesc == NULL)
{
break;
}
/* Cast the data_conf to a notification. We get both the private and public
* notification structure to make it easier to use.
*/
primitive =(FAR struct ieee802154_primitive_s *)txdesc->conf;
wlinfo("Tx status: %s\n", IEEE802154_STATUS_STRING[txdesc->conf->status]);
switch(txdesc->frametype)
{
case IEEE802154_FRAME_DATA:
{
primitive->type = IEEE802154_PRIMITIVE_CONF_DATA;
mac802154_notify(priv, primitive);
}
break;
case IEEE802154_FRAME_COMMAND:
{
switch (priv->curr_cmd)
{
case IEEE802154_CMD_ASSOC_REQ:
mac802154_txdone_assocreq(priv, txdesc);
break;
case IEEE802154_CMD_ASSOC_RESP:
break;
case IEEE802154_CMD_DISASSOC_NOT:
break;
case IEEE802154_CMD_DATA_REQ:
/* Data requests can be sent for 3 different reasons.
*
* 1. On a beacon-enabled PAN, this command shall be sent
* by a device when macAutoRequest is equal to TRUE and
* a beacon frame indicating that data are pending for
* that device is received from its coordinator.
* 2. when instructed to do so by the next higher layer on
* reception of the MLME-POLL.request primitive.
* 3. a device may send this command to the coordinator
* macResponseWaitTime after the acknowledgment to an
* association request command.
*/
switch (priv->curr_op)
{
case MAC802154_OP_ASSOC:
mac802154_txdone_datareq_assoc(priv, txdesc);
break;
case MAC802154_OP_POLL:
mac802154_txdone_datareq_poll(priv, txdesc);
break;
default:
break;
}
break;
case IEEE802154_CMD_PANID_CONF_NOT:
break;
case IEEE802154_CMD_ORPHAN_NOT:
break;
case IEEE802154_CMD_BEACON_REQ:
break;
case IEEE802154_CMD_COORD_REALIGN:
break;
case IEEE802154_CMD_GTS_REQ:
break;
default:
ieee802154_primitive_free(primitive);
break;
}
}
break;
default:
{
ieee802154_primitive_free(primitive);
}
break;
}
/* Free the IOB and the tx descriptor */
iob_free(txdesc->frame);
mac802154_txdesc_free(priv, txdesc);
}
mac802154_unlock(priv)
}
/****************************************************************************
* Name: mac802154_rxframe
*
* Description:
* Called from the radio driver through the callback struct. This function is
* called when the radio has received a frame. The frame is passed in an iob,
* so that we can free it when we are done processing. A pointer to the RX
* descriptor is passed along with the iob, but it must be copied here as it
* is allocated directly on the caller's stack. We simply link the frame,
* copy the RX descriptor, and schedule a worker to process the frame later so
* that we do not hold up the radio.
*
****************************************************************************/
static void mac802154_rxframe(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_data_ind_s *ind)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
DEBUGASSERT(cb != NULL && cb->priv != NULL);
priv = cb->priv;
/* Get exclusive access to the driver structure. We don't care about any
* signals so if we see one, just go back to trying to get access again.
*/
mac802154_lock(priv, false);
/* Push the iob onto the tail of the frame list for processing */
sq_addlast((FAR sq_entry_t *)ind, &priv->dataind_queue);
wlinfo("Frame received\n");
mac802154_unlock(priv)
/* Schedule work with the work queue to process the completion further */
if (work_available(&priv->rx_work))
{
work_queue(HPWORK, &priv->rx_work, mac802154_rxframe_worker,
(FAR void *)priv, 0);
}
}
/****************************************************************************
* Name: mac802154_rxframe_worker
*
* Description:
* Worker function scheduled from mac802154_rxframe. This function processes
* any frames in the list. Frames intended to be consumed by the MAC layer
* will not produce any callbacks to the next highest layer. Frames intended
* for the application layer will be forwarded to them.
*
****************************************************************************/
static void mac802154_rxframe_worker(FAR void *arg)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)arg;
FAR struct ieee802154_data_ind_s *ind;
FAR struct iob_s *iob;
uint16_t *frame_ctrl;
bool panid_comp;
uint8_t ftype;
while(1)
{
/* Get exclusive access to the driver structure. We don't care about any
* signals so if we see one, just go back to trying to get access again.
*/
mac802154_lock(priv, false);
/* Pop the data indication from the head of the frame list for processing
* Note: dataind_queue contains ieee802154_primitive_s which is safe to
* cast directly to a data indication.
*/
ind = (FAR struct ieee802154_data_ind_s *)sq_remfirst(&priv->dataind_queue);
/* Once we pop off the indication, we don't need to keep the mac locked */
mac802154_unlock(priv)
if (ind == NULL)
{
return;
}
/* Get a local copy of the frame to make it easier to access */
iob = ind->frame;
/* Set a local pointer to the frame control then move the offset past
* the frame control field
*/
frame_ctrl = (uint16_t *)&iob->io_data[iob->io_offset];
iob->io_offset += 2;
/* We use the data_ind_s as a container for the frame information even if
* this isn't a data frame
*/
ind->src.mode = (*frame_ctrl & IEEE802154_FRAMECTRL_SADDR) >>
IEEE802154_FRAMECTRL_SHIFT_SADDR;
ind->dest.mode = (*frame_ctrl & IEEE802154_FRAMECTRL_DADDR) >>
IEEE802154_FRAMECTRL_SHIFT_DADDR;
panid_comp = (*frame_ctrl & IEEE802154_FRAMECTRL_PANIDCOMP) >>
IEEE802154_FRAMECTRL_SHIFT_PANIDCOMP;
ind->dsn = iob->io_data[iob->io_offset++];
/* If the destination address is included */
if (ind->dest.mode != IEEE802154_ADDRMODE_NONE)
{
/* Get the destination PAN ID */
mac802154_takepanid(iob, ind->dest.panid);
if (ind->dest.mode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_takesaddr(iob, ind->dest.saddr);
}
else if (ind->dest.mode == IEEE802154_ADDRMODE_EXTENDED)
{
mac802154_takeeaddr(iob, ind->dest.eaddr);
}
}
if (ind->src.mode != IEEE802154_ADDRMODE_NONE)
{
/* If the source address is included, and the PAN ID compression field
* is set, get the PAN ID from the header.
*/
if (panid_comp)
{
/* The source PAN ID is equal to the destination PAN ID */
IEEE802154_PANIDCOPY(ind->src.panid, ind->dest.panid);
}
else
{
mac802154_takepanid(iob, ind->src.panid);
}
if (ind->src.mode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_takesaddr(iob, ind->src.saddr);
}
else if (ind->src.mode == IEEE802154_ADDRMODE_EXTENDED)
{
mac802154_takeeaddr(iob, ind->src.eaddr);
}
}
/* If the MAC is in promiscuous mode, just pass everything to the next layer
* assuming it is data
*/
if (priv->promisc)
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
continue;
}
ftype = (*frame_ctrl & IEEE802154_FRAMECTRL_FTYPE) >>
IEEE802154_FRAMECTRL_SHIFT_FTYPE;
switch (ftype)
{
case IEEE802154_FRAME_DATA:
{
mac802154_rxdataframe(priv, ind);
}
break;
case IEEE802154_FRAME_COMMAND:
{
/* Get the command type. The command type is always the first
* field after the MHR. Consu;me the byte by increasing offset so that
* subsequent functions can start from the byte after the command ID.
*/
uint8_t cmdtype = iob->io_data[iob->io_offset++];
switch (cmdtype)
{
case IEEE802154_CMD_ASSOC_REQ:
wlinfo("Assoc request received\n");
mac802154_rx_assocreq(priv, ind);
break;
case IEEE802154_CMD_ASSOC_RESP:
wlinfo("Assoc response received\n");
mac802154_rx_assocresp(priv, ind);
break;
case IEEE802154_CMD_DISASSOC_NOT:
wlinfo("Disassoc primitive received\n");
break;
case IEEE802154_CMD_DATA_REQ:
wlinfo("Data request received\n");
mac802154_rxdatareq(priv, ind);
break;
case IEEE802154_CMD_PANID_CONF_NOT:
wlinfo("PAN ID Conflict primitive received\n");
break;
case IEEE802154_CMD_ORPHAN_NOT:
wlinfo("Orphan primitive received\n");
break;
case IEEE802154_CMD_BEACON_REQ:
wlinfo("Beacon request received\n");
break;
case IEEE802154_CMD_COORD_REALIGN:
wlinfo("Coord realign received\n");
break;
case IEEE802154_CMD_GTS_REQ:
wlinfo("GTS request received\n");
break;
}
/* Free the data indication struct from the pool */
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)ind);
}
break;
case IEEE802154_FRAME_BEACON:
{
wlinfo("Beacon frame received. BSN: 0x%02X\n", ind->dsn);
mac802154_rxbeaconframe(priv, ind);
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)ind);
}
break;
case IEEE802154_FRAME_ACK:
{
/* The radio layer is responsible for handling all ACKs and retries.
* If for some reason an ACK gets here, just throw it out.
*/
wlinfo("ACK received\n");
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)ind);
}
break;
}
}
}
/****************************************************************************
* Name: mac802154_rxdataframe
*
* Description:
* Function called from the generic RX Frame worker to parse and handle the
* reception of a data frame.
*
****************************************************************************/
static void mac802154_rxdataframe(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind)
{
FAR struct ieee802154_primitive_s *primitive;
/* Get exclusive access to the MAC */
mac802154_lock(priv, false);
/* If we are currently performing a POLL operation and we've
* received a data response, use the addressing information
* to determine if it is extracted data. If the addressing info
* matches, notify the next highest layer using POLL.confirm
* primitive. If the addressing information does not match,
* handle the transaction like any other data transaction.
*
* Note: We can't receive frames without addressing information
* unless we are the PAN coordinator. And in that situation, we
* wouldn't be performing a POLL operation. Meaning:
*
* If the current operation is POLL, we aren't the PAN coordinator
* so the incoming frame CAN'T
*
* FIXME: Fix documentation
*/
if (priv->curr_op == MAC802154_OP_POLL ||
priv->curr_op == MAC802154_OP_ASSOC ||
priv->curr_op == MAC802154_OP_AUTOEXTRACT)
{
/* If we are in promiscuous mode, we need to check if the
* frame is even for us first. If the address is not ours,
* then handle the frame like a normal transaction.
*/
if (priv->promisc)
{
if (!IEEE802154_PANIDCMP(ind->dest.panid, priv->addr.panid))
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
if (ind->dest.mode == IEEE802154_ADDRMODE_SHORT &&
!IEEE802154_SADDRCMP(ind->dest.saddr, priv->addr.saddr))
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
else if (ind->dest.mode == IEEE802154_ADDRMODE_EXTENDED &&
!IEEE802154_EADDRCMP(ind->dest.eaddr, priv->addr.eaddr))
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
else
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
}
/* If this was our extracted data, the source addressing field can only
* be NONE if we are trying to extract data from the PAN coordinator.
* A PAN coordinator shouldn't be sending us a frame if it wasn't
* our extracted data. Therefore just assume if the address mode is set
* to NONE, we process it as our extracted frame
*/
if (ind->src.mode != priv->cmd_desc->destaddr.mode)
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
if (ind->src.mode == IEEE802154_ADDRMODE_SHORT &&
!IEEE802154_SADDRCMP(ind->src.saddr, priv->cmd_desc->destaddr.saddr))
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
else if (ind->src.mode == IEEE802154_ADDRMODE_EXTENDED &&
!IEEE802154_EADDRCMP(ind->src.eaddr, priv->cmd_desc->destaddr.eaddr))
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
/* If we've gotten this far, the frame is our extracted data. Cancel the
* timeout
*/
mac802154_timercancel(priv);
/* If a frame is received from the coordinator with a zero length payload
* or if the frame is a MAC command frame, the MLME will issue the
* MLME-POLL.confirm primitive with a status of NO_DATA. [1] pg. 111
*/
primitive = ieee802154_primitive_allocate();
if (priv->curr_op == MAC802154_OP_POLL)
{
primitive->type = IEEE802154_PRIMITIVE_CONF_POLL;
if (ind->frame->io_offset == ind->frame->io_len)
{
primitive->u.pollconf.status = IEEE802154_STATUS_NO_DATA;
}
else
{
primitive->u.pollconf.status = IEEE802154_STATUS_SUCCESS;
}
}
else if (priv->curr_op == MAC802154_OP_ASSOC)
{
/* If we ever receive a data frame back as a response to the
* association request, we assume it means there wasn't any data.
*/
primitive->type = IEEE802154_PRIMITIVE_CONF_ASSOC;
primitive->u.assocconf.status = IEEE802154_STATUS_NO_DATA;
}
/* We are no longer performing the association operation */
priv->curr_op = MAC802154_OP_NONE;
priv->cmd_desc = NULL;
mac802154_givesem(&priv->opsem);
/* Release the MAC and notify the next highest layer */
mac802154_notify(priv, primitive);
/* If there was data, pass it along */
if (ind->frame->io_len > ind->frame->io_offset)
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
else
{
ieee802154_primitive_free((FAR struct ieee802154_primitive_s *)ind);
}
}
else
{
mac802154_notify(priv, (FAR struct ieee802154_primitive_s *)ind);
}
mac802154_unlock(priv)
}
/****************************************************************************
* Name: mac802154_rxdatareq
*
* Description:
* Function called from the generic RX Frame worker to parse and handle the
* reception of an Data Request MAC command frame.
*
****************************************************************************/
static void mac802154_rxdatareq(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind)
{
FAR struct ieee802154_txdesc_s *txdesc;
FAR struct iob_s *iob;
uint16_t *frame_ctrl;
/* Get exclusive access to the MAC */
mac802154_lock(priv, false);
/* Search the list of indirect transactions to see if there are any waiting
* for the requesting device.
*/
/* TODO: I believe there is an issue here. If there is for some reason a
* outgoing data frame to a device who is currently requesting association,
* we will send the data frame as a response to an association request. We
* need to check for this condition.
*/
txdesc = (FAR struct ieee802154_txdesc_s *)sq_peek(&priv->indirect_queue);
while(txdesc != NULL)
{
if (txdesc->destaddr.mode == ind->src.mode)
{
if (txdesc->destaddr.mode == IEEE802154_ADDRMODE_SHORT)
{
if (IEEE802154_SADDRCMP(txdesc->destaddr.saddr, ind->src.saddr))
{
/* Remove the transaction from the queue */
sq_rem((FAR sq_entry_t *)txdesc, &priv->indirect_queue);
/* NOTE: We don't do anything with the purge timeout, because
* we really don't need to. As of now, I see no disadvantage
* to just letting the timeout expire, which won't purge the
* transaction since it is no longer on the list, and then it
* will reschedule the next timeout appropriately. The logic
* otherwise may get complicated even though it may save a few
* clock cycles.
*/
/* The addresses match, send the transaction immediately */
priv->radio->txdelayed(priv->radio, txdesc, 0);
priv->beaconupdate = true;
mac802154_unlock(priv)
return;
}
}
else if (txdesc->destaddr.mode == IEEE802154_ADDRMODE_EXTENDED)
{
if (IEEE802154_EADDRCMP(txdesc->destaddr.eaddr, ind->src.eaddr))
{
/* Remove the transaction from the queue */
sq_rem((FAR sq_entry_t *)txdesc, &priv->indirect_queue);
/* The addresses match, send the transaction immediately */
priv->radio->txdelayed(priv->radio, txdesc, 0);
priv->beaconupdate = true;
mac802154_unlock(priv)
return;
}
}
else
{
DEBUGASSERT(false);
}
}
txdesc = (FAR struct ieee802154_txdesc_s *)sq_next((FAR sq_entry_t *)txdesc);
}
/* If there is no data frame pending for the requesting device, the coordinator
* shall send a data frame without requesting acknowledgment to the device
* containing a zero length payload, indicating that no data are present, using
* one of the mechanisms described in this subclause. [1] pg. 43
*/
/* Allocate an IOB to put the frame in */
iob = iob_alloc(false);
DEBUGASSERT(iob != NULL);
iob->io_flink = NULL;
iob->io_len = 0;
iob->io_offset = 0;
iob->io_pktlen = 0;
iob->io_len += 2;
/* Cast the first two bytes of the IOB to a uint16_t frame control field */
frame_ctrl = (FAR uint16_t *)&iob->io_data[0];
/* Ensure we start with a clear frame control field */
*frame_ctrl = 0;
/* Set the frame type to Data */
*frame_ctrl |= IEEE802154_FRAME_DATA << IEEE802154_FRAMECTRL_SHIFT_FTYPE;
/* Each time a data or a MAC command frame is generated, the MAC sublayer
* shall copy the value of macDSN into the Sequence Number field of the MHR
* of the outgoing frame and then increment it by one. [1] pg. 40.
*/
iob->io_data[iob->io_len++] = priv->dsn++;
/* Use the source address information from the received data request to
* respond.
*/
mac802154_putpanid(iob, ind->src.panid);
if (ind->src.mode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_putsaddr(iob, ind->src.saddr);
}
else if (ind->src.mode == IEEE802154_ADDRMODE_EXTENDED)
{
mac802154_puteaddr(iob, ind->src.eaddr);
}
else
{
DEBUGASSERT(false);
}
/* Set the destination addr mode inside the frame control field */
*frame_ctrl |= (ind->src.mode << IEEE802154_FRAMECTRL_SHIFT_DADDR);
/* Check if the source PAN ID of the incoming request is the same as ours. */
if (IEEE802154_PANIDCMP(ind->src.panid, priv->addr.panid))
{
*frame_ctrl |= IEEE802154_FRAMECTRL_PANIDCOMP;
}
else
{
/* Copy in our PAN ID */
mac802154_putpanid(iob, priv->addr.panid);
}
/* Copy in our address using the mode that the device used to address us */
if (ind->dest.mode == IEEE802154_ADDRMODE_SHORT)
{
mac802154_putsaddr(iob, priv->addr.saddr);
*frame_ctrl |= (IEEE802154_ADDRMODE_SHORT << IEEE802154_FRAMECTRL_SHIFT_SADDR);
}
else
{
mac802154_puteaddr(iob, priv->addr.eaddr);
*frame_ctrl |= (IEEE802154_ADDRMODE_EXTENDED << IEEE802154_FRAMECTRL_SHIFT_SADDR);
}
/* Allocate the txdesc, waiting if necessary, allow interruptions */
mac802154_txdesc_alloc(priv, &txdesc, false);
txdesc->frame = iob;
txdesc->frametype = IEEE802154_FRAME_DATA;
mac802154_unlock(priv)
priv->radio->txdelayed(priv->radio, txdesc, 0);
}
static void mac802154_sfevent(FAR const struct ieee802154_radiocb_s *radiocb,
enum ieee802154_sfevent_e sfevent)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
DEBUGASSERT(cb != NULL && cb->priv != NULL);
priv = cb->priv;
/* Get exclusive access to the driver structure. We don't care about any
* signals so if we see one, just go back to trying to get access again.
*/
mac802154_lock(priv, false);
switch (sfevent)
{
case IEEE802154_SFEVENT_ENDOFACTIVE:
{
#ifdef CONFIG_MAC802154_SFEVENT_VERBOSE
wlinfo("End of superframe\n");
#endif
/* Check if there is any reason to update the beacon */
if (priv->beaconupdate)
{
mac802154_updatebeacon(priv);
priv->radio->beaconupdate(priv->radio, &priv->beaconframe[priv->bf_ind]);
}
}
break;
default:
break;
}
mac802154_unlock(priv)
}
/****************************************************************************
* Name: mac802154_rxbeaconframe
*
* Description:
* Function called from the generic RX Frame worker to parse and handle the
* reception of a beacon frame.
*
* Assumptions: MAC is unlocked
*
****************************************************************************/
static void mac802154_rxbeaconframe(FAR struct ieee802154_privmac_s *priv,
FAR struct ieee802154_data_ind_s *ind)
{
FAR struct ieee802154_txdesc_s *respdesc;
FAR struct ieee802154_primitive_s *primitive;
FAR struct ieee802154_beacon_ind_s *beacon;
FAR struct iob_s *iob = ind->frame;
uint8_t ngtsdesc;
uint8_t gtsdirmask;
bool pending_saddr = false;
bool pending_eaddr = false;
int i;
/* Even though we may not use the primitive, we allocate one to hold all the
* parsed beacon information. Freeing the primitive is quick, so it's worth
* worth saving a copy (If you were to parse all the info in locally, you
* would have to copy the data over in the case that you actually need to
* notify the next highest layer)
*/
primitive = ieee802154_primitive_allocate();
beacon = &primitive->u.beaconind;
/* Make sure there is another 2 bytes to process */
if (iob->io_len < iob->io_offset + 2)
{
goto errout;
}
/* Copy the coordinator address and channel info into the pan descriptor */
memcpy(&beacon->pandesc.coordaddr, &ind->src, sizeof(struct ieee802154_addr_s));
beacon->pandesc.chan = priv->currscan.channels[priv->scanindex];
beacon->pandesc.chpage = priv->currscan.chpage;
beacon->pandesc.lqi = ind->lqi;
beacon->pandesc.timestamp = ind->timestamp;
/* Parse the superframe specification field */
beacon->pandesc.sfspec.beaconorder = IEEE802154_GETBEACONORDER(iob->io_data,
iob->io_offset);
beacon->pandesc.sfspec.sforder =
IEEE802154_GETSFORDER(iob->io_data, iob->io_offset);
beacon->pandesc.sfspec.final_capslot =
IEEE802154_GETFINCAPSLOT(iob->io_data, iob->io_offset);
beacon->pandesc.sfspec.ble =
IEEE802154_GETBLE(iob->io_data, iob->io_offset);
beacon->pandesc.sfspec.pancoord =
IEEE802154_GETPANCOORD(iob->io_data, iob->io_offset);
beacon->pandesc.sfspec.assocpermit =
IEEE802154_GETASSOCPERMIT(iob->io_data, iob->io_offset);
iob->io_offset += 2;
/* Make sure there is another byte to process (GTS Spec) */
if (iob->io_len < iob->io_offset + 1)
{
goto errout;
}
/* Parse the GTS Specification field */
ngtsdesc = IEEE802154_GETGTSDESCCOUNT(iob->io_data, iob->io_offset);
beacon->pandesc.gtspermit = IEEE802154_GETGTSPERMIT(iob->io_data, iob->io_offset);
iob->io_offset++;
/* If there are any GTS descriptors, handle the GTS Dir and GTS List fields */
if (ngtsdesc > 0)
{
/* Make sure there is another bytes to process (GTS Direction) */
if (iob->io_len < iob->io_offset + 1)
{
goto errout;
}
gtsdirmask = IEEE802154_GETGTSDIRMASK(iob->io_data, iob->io_offset);
UNUSED(gtsdirmask);
iob->io_offset++;
/* Make sure there are enough bytes left to represent the GTS List */
if (iob->io_len < iob->io_offset + (3 * ngtsdesc))
{
goto errout;
}
for (i = 0; i < ngtsdesc; i++)
{
/* For now we just discard the data by skipping over it */
iob->io_offset += 3;
}
}
/* Pending address fields. Min 1 byte, the Pending Address Specification */
if (iob->io_len < iob->io_offset + 1)
{
goto errout;
}
beacon->pendaddr.nsaddr = IEEE802154_GETNPENDSADDR(iob->io_data, iob->io_offset);
beacon->pendaddr.neaddr = IEEE802154_GETNPENDEADDR(iob->io_data, iob->io_offset);
iob->io_offset++;
/* Make sure there are enough bytes left to represent the address list */
if (iob->io_len < (iob->io_offset +
(IEEE802154_SADDRSIZE * beacon->pendaddr.nsaddr) +
(IEEE802154_EADDRSIZE * beacon->pendaddr.neaddr)))
{
goto errout;
}
/* Copy in the pending addresses */
for (i = 0; i < beacon->pendaddr.nsaddr; i++)
{
beacon->pendaddr.addr[i].mode = IEEE802154_ADDRMODE_SHORT;
mac802154_takesaddr(iob, beacon->pendaddr.addr[i].saddr);
/* Check if the short address matches our short address */
if (IEEE802154_SADDRCMP(beacon->pendaddr.addr[i].saddr, priv->addr.saddr))
{
/* Wait to actually decide how to handle this until we parse
* the rest of the frame
*/
wlinfo("Data pending for us in coord\n");
pending_saddr = true;
}
}
for (i = beacon->pendaddr.nsaddr;
i < (beacon->pendaddr.nsaddr + beacon->pendaddr.neaddr);
i++)
{
beacon->pendaddr.addr[i].mode = IEEE802154_ADDRMODE_EXTENDED;
mac802154_takeeaddr(iob, beacon->pendaddr.addr[i].eaddr);
/* If the extended address matches our extended address */
if (IEEE802154_EADDRCMP(beacon->pendaddr.addr[i].eaddr, priv->addr.eaddr))
{
/* Wait to actually decide how to handle this until we parse
* the rest of the frame
*/
wlinfo("Data pending for us in coord\n");
pending_eaddr = true;
}
}
/* If there is anything left in the frame, process it as the beacon payload */
beacon->payloadlength = iob->io_len - iob->io_offset;
if (beacon->payloadlength > 0)
{
memcpy(beacon->payload, &iob->io_data[iob->io_offset], beacon->payloadlength);
}
/* At this point, we have extracted all relevant info from the incoming frame */
mac802154_lock(priv, false);
if (priv->curr_op == MAC802154_OP_SCAN)
{
/* Check to see if we already have a frame from this coordinator */
for (i = 0; i < priv->npandesc; i++)
{
if (priv->currscan.channels[priv->scanindex] != priv->pandescs[i].chan)
{
continue;
}
if (memcmp(&ind->src, &priv->pandescs[i].coordaddr,
sizeof(struct ieee802154_addr_s)) != 0)
{
continue;
}
/* The beacon is the same as another, so discard it */
ieee802154_primitive_free(primitive);
mac802154_unlock(priv);
return;
}
/* TODO: There is supposed to be different logic for the scanning procedure
* based on the macAutoRequest attribute. Currently, we perform scan
* operations as if macAutoRequest is set to TRUE, without actually checking
* the value. Basically, if macAutoRequest is TRUE, we are supposed to
* round up all of the pandesc results and pass them all up via the
* SCAN.confirm primitive. If macAutoRequest is FALSE, we are supposed
* to notify the next highest layer each time a unique beacon is received
* via the BEACON.notify primitive, and pass a NULLed out list of pandesc
* when SCAN.confirm is sent.
*/
/* Copy the pan desc to the list of pan desc */
memcpy(&priv->pandescs[priv->npandesc], &beacon->pandesc,
sizeof(struct ieee802154_pandesc_s));
priv->npandesc++;
if (priv->npandesc == MAC802154_NPANDESC)
{
mac802154_scanfinish(priv, IEEE802154_STATUS_LIMITREACHED);
}
}
/* If we are not performing a SCAN operation */
else
{
/* Check the superframe structure and update the appropriate attributes. */
if (memcmp(&priv->sfspec, &beacon->pandesc.sfspec,
sizeof(struct ieee802154_superframespec_s)) != 0)
{
/* Copy in the new superframe spec */
memcpy(&priv->sfspec, &beacon->pandesc.sfspec,
sizeof(struct ieee802154_superframespec_s));
/* Tell the radio layer about the superframe spec update */
priv->radio->sfupdate(priv->radio, &priv->sfspec);
}
/* If we are performing an association and there is data pending for us
* we ignore the autoRequest logic and just extract it. We also don't
* send a BEACON-NOTFIY.indication in this case, not sure if that
* is the right thing to do, can't find anything definitive in standard.
*/
if (priv->curr_op == MAC802154_OP_ASSOC && pending_eaddr)
{
priv->curr_cmd = IEEE802154_CMD_DATA_REQ;
mac802154_txdesc_alloc(priv, &respdesc, false);
mac802154_createdatareq(priv, &priv->pandesc.coordaddr,
IEEE802154_ADDRMODE_EXTENDED, respdesc);
/* Link the transaction into the CSMA transaction list */
sq_addlast((FAR sq_entry_t *)respdesc, &priv->csma_queue);
/* Notify the radio driver that there is data available */
priv->radio->txnotify(priv->radio, false);
}
else
{
if (priv->autoreq || priv->curr_op == MAC802154_OP_POLL)
{
/* If a beacon frame is received and macAutoRequest is set to
* TRUE, the MLME shall first issue the MLME-
* BEACON-NOTIFY.indication primitive if the beacon contains any
* payload.
*/
if (beacon->payloadlength > 0)
{
mac802154_notify(priv, primitive);
}
/* If we have data pending for us, attempt to extract it. If for some
* reason we have data pending under our short address and our
* extended address, let the short address arbitrarily take precedence
*/
if (pending_saddr | pending_eaddr)
{
mac802154_txdesc_alloc(priv, &respdesc, false);
if (priv->curr_op == MAC802154_OP_POLL)
{
priv->curr_cmd = IEEE802154_CMD_DATA_REQ;
}
else if (priv->curr_op == MAC802154_OP_ASSOC)
{
priv->curr_cmd = IEEE802154_CMD_DATA_REQ;
}
else if (priv->curr_op == MAC802154_OP_NONE)
{
DEBUGASSERT(priv->opsem.semcount == 1);
mac802154_takesem(&priv->opsem, false);
priv->curr_op = MAC802154_OP_AUTOEXTRACT;
priv->curr_cmd = IEEE802154_CMD_DATA_REQ;
}
if (pending_saddr)
{
mac802154_createdatareq(priv, &priv->pandesc.coordaddr,
IEEE802154_ADDRMODE_SHORT, respdesc);
}
else
{
mac802154_createdatareq(priv, &priv->pandesc.coordaddr,
IEEE802154_ADDRMODE_EXTENDED, respdesc);
}
/* Link the transaction into the CSMA transaction list */
sq_addlast((FAR sq_entry_t *)respdesc, &priv->csma_queue);
/* Notify the radio driver that there is data available */
priv->radio->txnotify(priv->radio, false);
}
/* If there was a beacon payload, we used the primitive, so
* return here to make sure we don't free the primitive.
*/
if (beacon->payloadlength > 0)
{
mac802154_unlock(priv);
return;
}
}
else
{
/* If a valid beacon frame is received and macAutoRequest is set to FALSE,
* the MLME shall indicate the beacon parameters to the next higher layer
* by issuing the MLME-BEACON-NOTIFY.indication primitive. [1] pg. 38
*/
mac802154_notify(priv, primitive);
mac802154_unlock(priv);
return; /* Return so that we don't free the primitive */
}
}
}
mac802154_unlock(priv);
ieee802154_primitive_free(primitive);
return;
errout:
wlwarn("Received beacon with bad format\n");
ieee802154_primitive_free(primitive);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: mac802154_create
*
* Description:
* Create a 802.15.4 MAC device from a 802.15.4 compatible radio device.
*
* The returned MAC structure should be passed to either the next highest
* layer in the network stack, or registered with a mac802154dev character
* or network drivers. In any of these scenarios, the next highest layer
* should register a set of callbacks with the MAC layer by setting the
* mac->cbs member.
*
* NOTE: This API does not create any device accessible to userspace. If
* you want to call these APIs from userspace, you have to wrap your mac
* in a character device via mac802154_device.c.
*
* Input Parameters:
* radiodev - an instance of an IEEE 802.15.4 radio
*
* Returned Value:
* An opaque reference to the MAC state data.
*
****************************************************************************/
MACHANDLE mac802154_create(FAR struct ieee802154_radio_s *radiodev)
{
FAR struct ieee802154_privmac_s *mac;
FAR struct ieee802154_radiocb_s *radiocb;
uint8_t eaddr[IEEE802154_EADDRSIZE];
int i;
/* Allocate object */
mac = (FAR struct ieee802154_privmac_s *)
kmm_zalloc(sizeof(struct ieee802154_privmac_s));
if (mac == NULL)
{
wlinfo("Failed allocation privmac structure\n");
return NULL;
}
/* Allow exclusive access to the privmac struct */
nxsem_init(&mac->exclsem, 0, 1);
/* Allow exclusive access to the dedicated command transaction */
nxsem_init(&mac->opsem, 0, 1);
/* Initialize fields */
mac->radio = radiodev;
/* Initialize the Radio callbacks */
mac->radiocb.priv = mac;
radiocb = &mac->radiocb.cb;
radiocb->poll = mac802154_radiopoll;
radiocb->txdone = mac802154_txdone;
radiocb->rxframe = mac802154_rxframe;
radiocb->sfevent = mac802154_sfevent;
/* Bind our callback structure */
radiodev->bind(radiodev, &mac->radiocb.cb);
/* Initialize our various data pools */
ieee802154_primitivepool_initialize();
mac802154_resetqueues(mac);
mac802154_req_reset((MACHANDLE)mac, true);
/* Set the default extended address */
for (i = 0; i < IEEE802154_EADDRSIZE; i++)
{
eaddr[i] = (CONFIG_IEEE802154_DEFAULT_EADDR >> (8 * i)) & 0xFF;
}
mac802154_seteaddr(mac, eaddr);
return (MACHANDLE)mac;
}
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