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nuttx/wireless/ieee802154/mac802154.c

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/****************************************************************************
* wireless/ieee802154/mac802154.c
*
* Copyright (C) 2016 Sebastien Lorquet. All rights reserved.
* Author: Sebastien Lorquet <sebastien@lorquet.fr>
*
* 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/drivers/iob.h>
#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
#include "mac802154.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* If processing is not done at the interrupt level, then work queue support
* is required.
*/
#if !defined(CONFIG_SCHED_WORKQUEUE)
# error Work queue support is required in this configuration (CONFIG_SCHED_WORKQUEUE)
#else
/* Use the low priority work queue if possible */
# if defined(CONFIG_MAC802154_HPWORK)
# define MAC802154_WORK HPWORK
# elif defined(CONFIG_MAC802154_LPWORK)
# define MAC802154_WORK LPWORK
# else
# error Neither CONFIG_MAC802154_HPWORK nor CONFIG_MAC802154_LPWORK defined
# endif
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct mac802154_trans_s
{
/* Supports a singly linked list */
FAR struct mac802154_trans_s *flink;
FAR struct iob_s *frame;
uint8_t msdu_handle;
sem_t sem;
};
struct mac802154_unsec_mhr_s
{
uint8_t length;
union
{
uint16_t frame_control;
uint8_t data[IEEE802154_MAX_UNSEC_MHR_OVERHEAD];
} u;
};
struct mac802154_radiocb_s
{
struct ieee802154_radiocb_s cb;
FAR struct ieee802154_privmac_s *priv;
};
/* The privmac structure holds the internal state of the MAC and is the
* underlying represention of the opaque MACHANDLE. It contains storage for
* the IEEE802.15.4 MIB attributes.
*/
struct ieee802154_privmac_s
{
FAR struct ieee802154_radio_s *radio; /* Contained IEEE802.15.4 radio dev */
FAR const struct ieee802154_maccb_s *cb; /* Contained MAC callbacks */
FAR struct mac802154_radiocb_s radiocb; /* Interface to bind to radio */
sem_t exclsem; /* Support exclusive access */
struct work_s tx_work;
struct work_s rx_work;
/* Support a singly linked list of transactions that will be sent using the
* CSMA algorithm. On a non-beacon enabled PAN, these transactions will be
* sent whenever. On a beacon-enabled PAN, these transactions will be sent
* during the CAP of the Coordinator's superframe.
*/
FAR struct mac802154_trans_s *csma_head;
FAR struct mac802154_trans_s *csma_tail;
/* Support a singly linked list of transactions that will be sent indirectly.
* This list should only be used by a MAC acting as a coordinator. These
* transactions will stay here until the data is extracted by the destination
* device sending a Data Request MAC command or if too much time passes. This
* list should also be used to populate the address list of the outgoing
* beacon frame.
*/
FAR struct mac802154_trans_s *indirect_head;
FAR struct mac802154_trans_s *indirect_tail;
uint8_t txdesc_count;
struct ieee802154_txdesc_s txdesc[CONFIG_IEEE802154_NTXDESC];
/* Support a singly linked list of frames received */
FAR struct iob_s *rxframes_head;
FAR struct iob_s *rxframes_tail;
/* MAC PIB attributes, grouped to save memory */
/* Holds all address information (Extended, Short, and PAN ID) for the MAC. */
struct ieee802154_addr_s addr;
/* Holds all address information (Extended, Short) for Coordinator */
struct ieee802154_addr_s coord_addr;
/* The maximum number of symbols to wait for an acknowledgement frame to
* arrive following a transmitted data frame. [1] pg. 126
*
* NOTE: This may be able to be a 16-bit or even an 8-bit number. I wasn't
* sure at the time what the range of reasonable values was.
*/
uint32_t ack_wait_dur;
/* The maximum time to wait either for a frame intended as a response to a
* data request frame or for a broadcast frame following a beacon with the
* Frame Pending field set to one. [1] pg. 127
*
* NOTE: This may be able to be a 16-bit or even an 8-bit number. I wasn't
* sure at the time what the range of reasonable values was.
*/
uint32_t max_frame_wait_time;
/* The maximum time (in unit periods) that a transaction is stored by a
* coordinator and indicated in its beacon.
*/
uint16_t trans_persist_time;
/* Contents of beacon payload */
uint8_t beacon_payload[IEEE802154_MAX_BEACON_PAYLOAD_LENGTH];
uint8_t beacon_payload_len; /* Length of beacon payload */
uint8_t batt_life_ext_periods; /* # of backoff periods during which rx is
* enabled after the IFS following beacon */
uint8_t bsn; /* Seq. num added to tx beacon frame */
uint8_t dsn; /* Seq. num added to tx data or MAC frame */
uint8_t max_retries; /* Max # of retries alloed after tx failure */
/* The maximum time, in multiples of aBaseSuperframeDuration, a device shall
* wait for a response command frame to be available following a request
* command frame. [1] 128.
*/
uint8_t resp_wait_time;
/* The total transmit duration (including PHY header and FCS) specified in
* symbols. [1] pg. 129.
*/
uint32_t tx_total_dur;
/* Start of 32-bit bitfield */
uint32_t is_assoc : 1; /* Are we associated to the PAN */
uint32_t assoc_permit : 1; /* Are we allowing assoc. as a coord. */
uint32_t auto_req : 1; /* Automatically send data req. if addr
* addr is in the beacon frame */
uint32_t batt_life_ext : 1; /* Is BLE enabled */
uint32_t gts_permit : 1; /* Is PAN Coord. accepting GTS reqs. */
uint32_t promiscuous_mode : 1; /* Is promiscuous mode on? */
uint32_t ranging_supported : 1; /* Does MAC sublayer support ranging */
uint32_t rx_when_idle : 1; /* Recvr. on during idle periods */
uint32_t sec_enabled : 1; /* Does MAC sublayer have security en. */
uint32_t max_csma_backoffs : 3; /* Max num backoffs for CSMA algorithm
* before declaring ch access failure */
uint32_t beacon_order : 4; /* Freq. that beacon is transmitted */
uint32_t superframe_order : 4; /* Length of active portion of outgoing
* superframe, including the beacon */
/* The offset, measured is symbols, between the symbol boundary at which the
* MLME captures the timestamp of each transmitted and received frame, and
* the onset of the first symbol past the SFD, namely the first symbol of
* the frames [1] pg. 129.
*/
uint32_t sync_symb_offset : 12;
/* End of 32-bit bitfield */
/* Start of 32-bit bitfield */
uint32_t beacon_tx_time : 24; /* Time of last beacon transmit */
uint32_t min_be : 4; /* Min value of backoff exponent (BE) */
uint32_t max_be : 4; /* Max value of backoff exponent (BE) */
/* End of 32-bit bitfield */
/* Start of 32-bit bitfield */
uint32_t tx_ctrl_active_dur : 17; /* Duration for which tx is permitted to
* be active */
uint32_t tx_ctrl_pause_dur : 1; /* Duration after tx before another tx is
* permitted. 0=2000, 1= 10000 */
uint32_t timestamp_support : 1; /* Does MAC layer supports timestamping */
uint32_t is_coord : 1; /* Is this device acting as coordinator */
/* 12-bits remaining */
/* End of 32-bit bitfield. */
/* TODO: Add Security-related MAC PIB attributes */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static inline int mac802154_takesem(sem_t *sem);
#define mac802154_givesem(s) sem_post(s);
static void mac802154_txdone_worker(FAR void *arg);
static void mac802154_rxframe_worker(FAR void *arg);
/* Internal Functions */
static int mac802154_defaultmib(FAR struct ieee802154_privmac_s *priv);
static int mac802154_applymib(FAR struct ieee802154_privmac_s *priv);
/* IEEE 802.15.4 PHY Interface OPs */
static int mac802154_poll_csma(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *tx_desc,
FAR struct iob_s **frame);
static int mac802154_poll_gts(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *tx_desc,
FAR struct iob_s **frame);
static void mac802154_txdone(FAR const struct ieee802154_radiocb_s *radiocb,
FAR const struct ieee802154_txdesc_s *tx_desc);
static void mac802154_rxframe(FAR const struct ieee802154_radiocb_s *radiocb,
FAR const struct ieee802154_rxdesc_s *rx_desc,
FAR struct iob_s *frame);
/****************************************************************************
* Private Data
****************************************************************************/
/* Map between ieee802154_addr_mode_e enum and actual address length */
static const uint8_t mac802154_addr_length[4] = {0, 0, 2, 8};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mac802154_semtake
*
* Description:
* Acquire the semaphore used for access serialization.
*
****************************************************************************/
static inline int mac802154_takesem(sem_t *sem)
{
/* Take a count from the semaphore, possibly waiting */
if (sem_wait(sem) < 0)
{
/* EINTR is the only error that we expect */
int errcode = get_errno();
DEBUGASSERT(errcode == EINTR);
return -errcode;
}
return OK;
}
/****************************************************************************
* Name: mac802154_push_csma
*
* Description:
* Push a CSMA transaction onto the list
*
****************************************************************************/
static void mac802154_push_csma(FAR struct ieee802154_privmac_s *priv,
FAR struct mac802154_trans_s *trans)
{
/* Ensure the transactions forward link is NULL */
trans->flink = NULL;
/* If the tail is not empty, make the transaction pointed to by the tail,
* point to the new transaction */
if (priv->csma_tail != NULL)
{
priv->csma_tail->flink = trans;
}
/* Point the tail at the new transaction */
priv->csma_tail = trans;
/* If the head is NULL, we need to point it at the transaction since there
* is only one transaction in the list at this point */
if (priv->csma_head == NULL)
{
priv->csma_head = trans;
}
}
/****************************************************************************
* Name: mac802154_pop_csma
*
* Description:
* Pop a CSMA transaction from the list
*
****************************************************************************/
static FAR struct mac802154_trans_s *
mac802154_pop_csma(FAR struct ieee802154_privmac_s *priv)
{
FAR struct mac802154_trans_s *trans;
if (priv->csma_head == NULL)
{
return NULL;
}
/* Get the transaction from the head of the list */
trans = priv->csma_head;
/* Move the head pointer to the next transaction */
priv->csma_head = trans->flink;
/* If the head is now NULL, the list is empty, so clear the tail too */
if (priv->csma_head == NULL)
{
priv->csma_tail = NULL;
}
return trans;
}
/****************************************************************************
* Name: mac802154_defaultmib
*
* Description:
* Set the MIB to its default values.
*
****************************************************************************/
static int mac802154_defaultmib(FAR struct ieee802154_privmac_s *priv)
{
/* TODO: Set all MAC fields to default values */
return OK;
}
/****************************************************************************
* Name: mac802154_applymib
*
* Description:
* Some parts of the MIB must be sent to the radio device. This routine
* calls the radio device routines to store the related parameters in the
* radio driver. It must be called each time a MIB parameter is changed.
*
****************************************************************************/
static int mac802154_applymib(FAR struct ieee802154_privmac_s *priv)
{
return OK;
}
/****************************************************************************
* Name: mac802154_poll_csma
*
* Description:
* Called from the radio driver through the callback struct. This function is
* called when the radio has room for another CSMA transaction. If the MAC
* layer has a CSMA transaction, it copies it into the supplied buffer and
* returns the length. A descriptor is also populated with the transaction.
*
****************************************************************************/
static int mac802154_poll_csma(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *tx_desc,
FAR struct iob_s **frame)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
FAR struct mac802154_trans_s *trans;
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.
*/
while (mac802154_takesem(&priv->exclsem) != 0);
/* Check to see if there are any CSMA transactions waiting */
trans = mac802154_pop_csma(priv);
mac802154_givesem(&priv->exclsem);
if (trans != NULL)
{
/* Setup the transmit descriptor */
tx_desc->handle = trans->msdu_handle;
*frame = trans->frame;
/* Now that we've passed off the data, notify the waiting thread.
* NOTE: The transaction was allocated on the waiting thread's stack so
* it will be automatically deallocated when that thread awakens and
* returns. */
sem_post(&trans->sem);
return (trans->frame->io_len);
}
return 0;
}
/****************************************************************************
* Name: mac802154_poll_gts
*
* Description:
* Called from the radio driver through the callback struct. This function is
* called when the radio has room for another GTS transaction. If the MAC
* layer has a GTS transaction, it copies it into the supplied buffer and
* returns the length. A descriptor is also populated with the transaction.
*
****************************************************************************/
static int mac802154_poll_gts(FAR const struct ieee802154_radiocb_s *radiocb,
FAR struct ieee802154_txdesc_s *tx_desc,
FAR struct iob_s **frame)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
FAR struct mac802154_trans_s *trans;
int ret = 0;
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.
*/
while (mac802154_takesem(&priv->exclsem) != 0);
#warning Missing logic.
mac802154_givesem(&priv->exclsem);
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 const struct ieee802154_txdesc_s *tx_desc)
{
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.
*/
while (mac802154_takesem(&priv->exclsem) != 0);
/* Check to see if there is an available tx descriptor slot. If there is
* not we simply drop the notification */
if (priv->txdesc_count < CONFIG_IEEE802154_NTXDESC)
{
/* Copy the txdesc over and link it into our list */
memcpy(&priv->txdesc[priv->txdesc_count++], tx_desc,
sizeof(struct ieee802154_txdesc_s));
}
else
{
wlinfo("MAC802154: No room for TX Desc.\n");
}
mac802154_givesem(&priv->exclsem);
/* Schedule work with the work queue to process the completion further */
if (work_available(&priv->tx_work))
{
work_queue(MAC802154_WORK, &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;
int i = 0;
/* 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.
*/
while (mac802154_takesem(&priv->exclsem) != 0);
/* For each pending TX descriptor, send an application callback */
for (i = 0; i < priv->txdesc_count; i++)
{
priv->cb->mcps_notify(priv->cb, IEEE802154_NOTIFY_CONF_DATA,
(FAR const union ieee802154_mcps_notify_u *) &priv->txdesc[i]);
}
/* We've handled all the descriptors and no further desc could have been added
* since we have the struct locked */
priv->txdesc_count = 0;
mac802154_givesem(&priv->exclsem);
}
/****************************************************************************
* 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 const struct ieee802154_rxdesc_s *rx_desc,
FAR struct iob_s *frame)
{
FAR struct mac802154_radiocb_s *cb =
(FAR struct mac802154_radiocb_s *)radiocb;
FAR struct ieee802154_privmac_s *priv;
FAR struct ieee802154_rxdesc_s *desc;
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.
*/
while (mac802154_takesem(&priv->exclsem) != 0);
/* TODO: Copy the frame descriptor to some type of list */
/* Push the iob onto the tail of the frame list for processing */
priv->rxframes_tail->io_flink = frame;
priv->rxframes_tail = frame;
mac802154_givesem(&priv->exclsem);
/* Schedule work with the work queue to process the completion further */
if (work_available(&priv->rx_work))
{
work_queue(MAC802154_WORK, &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;
/* The radio layer is responsible for handling all ACKs and retries. If for
* some reason an ACK gets here, just throw it out.
*/
}
/****************************************************************************
* 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;
/* Allocate object */
mac = (FAR struct ieee802154_privmac_s *)
kmm_zalloc(sizeof(struct ieee802154_privmac_s));
if (mac == NULL)
{
return NULL;
}
/* Allow exclusive access to the privmac struct */
sem_init(&mac->exclsem, 0, 1);
/* Initialize fields */
mac->radio = radiodev;
mac802154_defaultmib(mac);
mac802154_applymib(mac);
/* Initialize the Radio callbacks */
mac->radiocb.priv = mac;
radiocb = &mac->radiocb.cb;
radiocb->poll_csma = mac802154_poll_csma;
radiocb->poll_gts = mac802154_poll_gts;
radiocb->txdone = mac802154_txdone;
radiocb->rxframe = mac802154_rxframe;
/* Bind our callback structure */
radiodev->ops->bind(radiodev, &mac->radiocb.cb);
return (MACHANDLE)mac;
}
/****************************************************************************
* Name: mac802154_bind
*
* Description:
* Bind the MAC callback table to the MAC state.
*
* Parameters:
* mac - Reference to the MAC driver state structure
* cb - MAC callback operations
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
int mac802154_bind(MACHANDLE mac, FAR const struct ieee802154_maccb_s *cb)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
priv->cb = cb;
return OK;
}
/****************************************************************************
* Name: mac802154_ioctl
*
* Description:
* Handle MAC and radio IOCTL commands directed to the MAC.
*
* Parameters:
* mac - Reference to the MAC driver state structure
* cmd - The IOCTL command
* arg - The argument for the IOCTL command
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
int mac802154_ioctl(MACHANDLE mac, int cmd, unsigned long arg)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
int ret = -EINVAL;
DEBUGASSERT(priv != NULL);
/* Check for IOCTLs aimed at the IEEE802.15.4 MAC layer */
if (_MAC802154IOCVALID(cmd))
{
/* Handle the MAC IOCTL command */
#warning Missing logic
}
/* No, other IOCTLs must be aimed at the IEEE802.15.4 radio layer */
else
{
DEBUGASSERT(priv->radio != NULL &&
priv->radio->ops != NULL &&
priv->radio->ops->ioctl != NULL);
ret = priv->radio->ops->ioctl(priv->radio, cmd, arg);
}
return ret;
}
/****************************************************************************
* MAC Interface Operations
****************************************************************************/
/****************************************************************************
* Name: mac802154_get_mhrlen
*
* Description:
* Calculate the MAC header length given the frame meta-data.
*
****************************************************************************/
int mac802154_get_mhrlen(MACHANDLE mac,
FAR struct ieee802154_frame_meta_s *meta)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
int ret = 3; /* Always frame control (2 bytes) and seq. num (1 byte) */
/* Check to make sure both the dest address and the source address are not set
* to NONE */
if (meta->dest_addr.mode == IEEE802154_ADDRMODE_NONE &&
meta->src_addr_mode == IEEE802154_ADDRMODE_NONE)
{
return -EINVAL;
}
/* The source address can only be set to NONE if the device is the PAN coord */
if (meta->src_addr_mode == IEEE802154_ADDRMODE_NONE && !priv->is_coord)
{
return -EINVAL;
}
/* Add the destination address length */
ret += mac802154_addr_length[meta->dest_addr.mode];
/* Add the source address length */
ret += mac802154_addr_length[ meta->src_addr_mode];
/* If both destination and source addressing information is present, the MAC
* sublayer shall compare the destination and source PAN identifiers.
* [1] pg. 41.
*/
if (meta->src_addr_mode != IEEE802154_ADDRMODE_NONE &&
meta->dest_addr.mode != IEEE802154_ADDRMODE_NONE)
{
/* If the PAN identifiers are identical, the PAN ID Compression field
* shall be set to one, and the source PAN identifier shall be omitted
* from the transmitted frame. [1] pg. 41.
*/
if (meta->dest_addr.panid == priv->addr.panid)
{
ret += 2; /* 2 bytes for destination PAN ID */
return ret;
}
}
/* If we are here, PAN ID compression is off, so include the dest and source
* PAN ID if the respective address is included
*/
if (meta->src_addr_mode != IEEE802154_ADDRMODE_NONE)
{
ret += 2; /* 2 bytes for source PAN ID */
}
if (meta->dest_addr.mode != IEEE802154_ADDRMODE_NONE)
{
ret += 2; /* 2 bytes for destination PAN ID */
}
return ret;
}
/****************************************************************************
* Name: mac802154_req_data
*
* Description:
* The MCPS-DATA.request primitive requests the transfer of a data SPDU
* (i.e., MSDU) from a local SSCS entity to a single peer SSCS entity.
* Confirmation is returned via the
* struct ieee802154_maccb_s->conf_data callback.
*
****************************************************************************/
int mac802154_req_data(MACHANDLE mac, FAR struct ieee802154_data_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
FAR struct mac802154_trans_s trans;
FAR struct ieee802154_frame_meta_s *meta = req->meta;
uint16_t *frame_ctrl;
uint8_t mhr_len = 3; /* Start assuming frame control and seq. num */
int ret;
/* Check the required frame size */
if (req->frame->io_len > IEEE802154_MAX_PHY_PACKET_SIZE)
{
return -E2BIG;
}
/* Cast the first two bytes of the IOB to a uint16_t frame control field */
frame_ctrl = (uint16_t *)&req->frame->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;
/* If the msduLength is greater than aMaxMACSafePayloadSize, the MAC
* sublayer will set the Frame Version to one. [1] pg. 118.
*/
if (meta->msdu_length > IEEE802154_MAX_SAFE_MAC_PAYLOAD_SIZE)
{
*frame_ctrl |= IEEE802154_FRAMECTRL_VERSION;
}
/* If the TXOptions parameter specifies that an acknowledged transmission
* is required, the AR field will be set appropriately, as described in
* 5.1.6.4 [1] pg. 118.
*/
*frame_ctrl |= (meta->msdu_flags.ack_tx << IEEE802154_FRAMECTRL_SHIFT_ACKREQ);
/* If the destination address is present, copy the PAN ID and one of the
* addresses, depending on mode, into the MHR.
*/
if (meta->dest_addr.mode != IEEE802154_ADDRMODE_NONE)
{
memcpy(&req->frame->io_data[mhr_len], &meta->dest_addr.panid, 2);
mhr_len += 2;
if (meta->dest_addr.mode == IEEE802154_ADDRMODE_SHORT)
{
memcpy(&req->frame->io_data[mhr_len], &meta->dest_addr.saddr, 2);
mhr_len += 2;
}
else if (meta->dest_addr.mode == IEEE802154_ADDRMODE_EXTENDED)
{
memcpy(&req->frame->io_data[mhr_len], &meta->dest_addr.eaddr, 8);
mhr_len += 8;
}
}
/* Set the destination addr mode inside the frame control field */
*frame_ctrl |= (meta->dest_addr.mode << IEEE802154_FRAMECTRL_SHIFT_DADDR);
/* From this point on, we need exclusive access to the privmac struct */
ret = mac802154_takesem(&priv->exclsem);
if (ret < 0)
{
wlerr("ERROR: mac802154_takesem failed: %d\n", ret);
return ret;
}
/* If both destination and source addressing information is present, the MAC
* sublayer shall compare the destination and source PAN identifiers.
* [1] pg. 41.
*/
if (meta->src_addr_mode != IEEE802154_ADDRMODE_NONE &&
meta->dest_addr.mode != IEEE802154_ADDRMODE_NONE)
{
/* If the PAN identifiers are identical, the PAN ID Compression field
* shall be set to one, and the source PAN identifier shall be omitted
* from the transmitted frame. [1] pg. 41.
*/
if (meta->dest_addr.panid == priv->addr.panid)
{
*frame_ctrl |= IEEE802154_FRAMECTRL_PANIDCOMP;
}
}
if (meta->src_addr_mode != IEEE802154_ADDRMODE_NONE)
{
/* If the destination address is not included, or if PAN ID Compression
* is off, we need to include the Source PAN ID.
*/
if ((meta->dest_addr.mode == IEEE802154_ADDRMODE_NONE) ||
(*frame_ctrl & IEEE802154_FRAMECTRL_PANIDCOMP))
{
memcpy(&req->frame->io_data[mhr_len], &priv->addr.panid, 2);
mhr_len += 2;
}
if (meta->src_addr_mode == IEEE802154_ADDRMODE_SHORT)
{
memcpy(&req->frame->io_data[mhr_len], &priv->addr.saddr, 2);
mhr_len += 2;
}
else if (meta->src_addr_mode == IEEE802154_ADDRMODE_EXTENDED)
{
memcpy(&req->frame->io_data[mhr_len], &priv->addr.eaddr, 8);
mhr_len += 8;
}
}
/* Set the source addr mode inside the frame control field */
*frame_ctrl |= (meta->src_addr_mode << IEEE802154_FRAMECTRL_SHIFT_SADDR);
/* 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.
*/
req->frame->io_data[2] = priv->dsn++;
/* The MAC header we just created must never have exceeded where the app
* data starts. This should never happen since the offset should have
* been set via the same logic to calculate the header length as the logic
* here that created the header
*/
DEBUGASSERT(mhr_len == req->frame->io_offset);
req->frame->io_offset = 0; /* Set the offset to 0 to include the header */
/* Setup our transaction */
trans.msdu_handle = meta->msdu_handle;
trans.frame = req->frame;
sem_init(&trans.sem, 0, 1);
/* If the TxOptions parameter specifies that a GTS transmission is required,
* the MAC sublayer will determine whether it has a valid GTS as described
* 5.1.7.3. If a valid GTS could not be found, the MAC sublayer will discard
* the MSDU. If a valid GTS was found, the MAC sublayer will defer, if
* necessary, until the GTS. If the TxOptions parameter specifies that a GTS
* transmission is not required, the MAC sublayer will transmit the MSDU using
* either slotted CSMA-CA in the CAP for a beacon-enabled PAN or unslotted
* CSMA-CA for a nonbeacon-enabled PAN. Specifying a GTS transmission in the
* TxOptions parameter overrides an indirect transmission request.
* [1] pg. 118.
*/
if (meta->msdu_flags.gts_tx)
{
/* TODO: Support GTS transmission. This should just change where we link
* the transaction. Instead of going in the CSMA transaction list, it
* should be linked to the GTS' transaction list. We'll need to check if
* the GTS is valid, and then find the GTS, before linking. Note, we also
* don't have to try and kick-off any transmission here.
*/
return -ENOTSUP;
}
else
{
/* If the TxOptions parameter specifies that an indirect transmission is
* required and this primitive is received by the MAC sublayer of a
* coordinator, the data frame is sent using indirect transmission, as
* described in 5.1.5 and 5.1.6.3. [1]
*/
if (meta->msdu_flags.indirect_tx)
{
/* If the TxOptions parameter specifies that an indirect transmission
* is required and if the device receiving this primitive is not a
* coordinator, the destination address is not present, or the
* TxOptions parameter also specifies a GTS transmission, the indirect
* transmission option will be ignored. [1]
*/
if (priv->is_coord && meta->dest_addr.mode != IEEE802154_ADDRMODE_NONE)
{
/* Link the transaction into the indirect_trans list */
}
else
{
/* Override the setting since it wasn't valid */
meta->msdu_flags.indirect_tx = 0;
}
}
/* If this is a direct transmission not during a GTS */
if (!meta->msdu_flags.indirect_tx)
{
/* Link the transaction into the CSMA transaction list */
mac802154_push_csma(priv, &trans);
/* We no longer need to have the MAC layer locked. */
mac802154_givesem(&priv->exclsem);
/* Notify the radio driver that there is data available */
priv->radio->ops->txnotify_csma(priv->radio);
sem_wait(&trans.sem);
}
}
sem_destroy(&trans.sem);
return OK;
}
/****************************************************************************
* Name: mac802154_req_purge
*
* Description:
* The MCPS-PURGE.request primitive allows the next higher layer to purge
* an MSDU from the transaction queue. Confirmation is returned via
* the struct ieee802154_maccb_s->conf_purge callback.
*
****************************************************************************/
int mac802154_req_purge(MACHANDLE mac, FAR struct ieee802154_purge_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_associate
*
* Description:
* The MLME-ASSOCIATE.request primitive allows a device to request an
* association with a coordinator. Confirmation is returned via the
* struct ieee802154_maccb_s->conf_associate callback.
*
****************************************************************************/
int mac802154_req_associate(MACHANDLE mac,
FAR struct ieee802154_assoc_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
/* Set the channel of the PHY layer */
/* Set the channel page of the PHY layer */
/* Set the macPANId */
/* Set either the macCoordExtendedAddress and macCoordShortAddress
* depending on the CoordAddrMode in the primitive.
*/
if (req->coord_addr.mode == IEEE802154_ADDRMODE_EXTENDED)
{
}
else if (req->coord_addr.mode == IEEE802154_ADDRMODE_EXTENDED)
{
}
else
{
return -EINVAL;
}
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_disassociate
*
* Description:
* The MLME-DISASSOCIATE.request primitive is used by an associated device to
* notify the coordinator of its intent to leave the PAN. It is also used by
* the coordinator to instruct an associated device to leave the PAN.
* Confirmation is returned via the
* struct ieee802154_maccb_s->conf_disassociate callback.
*
****************************************************************************/
int mac802154_req_disassociate(MACHANDLE mac,
FAR struct ieee802154_disassoc_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_get
*
* Description:
* The MLME-GET.request primitive requests information about a given PIB
* attribute. Actual data is returned via the
* struct ieee802154_maccb_s->conf_get callback.
*
****************************************************************************/
int mac802154_req_get(MACHANDLE mac, FAR struct ieee802154_get_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_gts
*
* Description:
* The MLME-GTS.request primitive allows a device to send a request to the PAN
* coordinator to allocate a new GTS or to deallocate an existing GTS.
* Confirmation is returned via the
* struct ieee802154_maccb_s->conf_gts callback.
*
****************************************************************************/
int mac802154_req_gts(MACHANDLE mac, FAR struct ieee802154_gts_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_reset
*
* Description:
* The MLME-RESET.request primitive allows the next higher layer to request
* that the MLME performs a reset operation. Confirmation is returned via
* the struct ieee802154_maccb_s->conf_reset callback.
*
****************************************************************************/
int mac802154_req_reset(MACHANDLE mac, FAR struct ieee802154_reset_req_s *req)
{
FAR struct ieee802154_privmac_s * priv =
(FAR struct ieee802154_privmac_s *) mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_rxenable
*
* Description:
* The MLME-RX-ENABLE.request primitive allows the next higher layer to
* request that the receiver is enable for a finite period of time.
* Confirmation is returned via the
* struct ieee802154_maccb_s->conf_rxenable callback.
*
****************************************************************************/
int mac802154_req_rxenable(MACHANDLE mac,
FAR struct ieee802154_rxenable_req_s *req)
{
FAR struct ieee802154_privmac_s * priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_scan
*
* Description:
* The MLME-SCAN.request primitive is used to initiate a channel scan over a
* given list of channels. A device can use a channel scan to measure the
* energy on the channel, search for the coordinator with which it associated,
* or search for all coordinators transmitting beacon frames within the POS of
* the scanning device. Scan results are returned
* via MULTIPLE calls to the struct ieee802154_maccb_s->conf_scan callback.
* This is a difference with the official 802.15.4 specification, implemented
* here to save memory.
*
****************************************************************************/
int mac802154_req_scan(MACHANDLE mac, FAR struct ieee802154_scan_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_set
*
* Description:
* The MLME-SET.request primitive attempts to write the given value to the
* indicated MAC PIB attribute. Confirmation is returned via the
* struct ieee802154_maccb_s->conf_set callback.
*
****************************************************************************/
int mac802154_req_set(MACHANDLE mac, FAR struct ieee802154_set_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_start
*
* Description:
* The MLME-START.request primitive makes a request for the device to start
* using a new superframe configuration. Confirmation is returned
* via the struct ieee802154_maccb_s->conf_start callback.
*
****************************************************************************/
int mac802154_req_start(MACHANDLE mac, FAR struct ieee802154_start_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_sync
*
* Description:
* The MLME-SYNC.request primitive requests to synchronize with the
* coordinator by acquiring and, if specified, tracking its beacons.
* Confirmation is returned via the
* struct ieee802154_maccb_s->int_commstatus callback. TOCHECK.
*
****************************************************************************/
int mac802154_req_sync(MACHANDLE mac, FAR struct ieee802154_sync_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_req_poll
*
* Description:
* The MLME-POLL.request primitive prompts the device to request data from
* the coordinator. Confirmation is returned via the
* struct ieee802154_maccb_s->conf_poll callback, followed by a
* struct ieee802154_maccb_s->ind_data callback.
*
****************************************************************************/
int mac802154_req_poll(MACHANDLE mac, FAR struct ieee802154_poll_req_s *req)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_rsp_associate
*
* Description:
* The MLME-ASSOCIATE.response primitive is used to initiate a response to
* an MLME-ASSOCIATE.indication primitive.
*
****************************************************************************/
int mac802154_rsp_associate(MACHANDLE mac,
FAR struct ieee802154_assoc_resp_s *resp)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
/****************************************************************************
* Name: mac802154_rsp_orphan
*
* Description:
* The MLME-ORPHAN.response primitive allows the next higher layer of a
* coordinator to respond to the MLME-ORPHAN.indication primitive.
*
****************************************************************************/
int mac802154_rsp_orphan(MACHANDLE mac,
FAR struct ieee802154_orphan_resp_s *resp)
{
FAR struct ieee802154_privmac_s *priv =
(FAR struct ieee802154_privmac_s *)mac;
return -ENOTTY;
}
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