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drivers: ieee802154: copy back the TX buffer into the upper layer

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Copy back the TX buffer content back into the upper layer
in case of a TX failure.

This is necessary in when frame encryption by the radio driver
is used. The shim layer for the nRF5 driver has a buffer, that
is used by the driver to authenticate and encrypt the frame
in-place. In case of a TX failure, the buffer contents
are propagated back to the upper layer. The upper layer
must use the same secured frame for retransmission.

Signed-off-by: Rafał Kuźnia <rafal.kuznia@nordicsemi.no>
This commit is contained in:
Rafał Kuźnia 2021-06-08 10:20:02 +02:00 • committed by Jukka Rissanen
commit cab64a9c61
1 changed files with 19 additions and 5 deletions
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24
drivers/ieee802154/ieee802154_nrf5.c
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@ -471,6 +471,7 @@ static int nrf5_tx(const struct device *dev,
uint8_t payload_len = frag->len;
uint8_t *payload = frag->data;
bool ret = true;
int result;
LOG_DBG("%p (%u)", payload, payload_len);
@ -528,19 +529,32 @@ static int nrf5_tx(const struct device *dev,
/* Handle ACK packet. */
return handle_ack(nrf5_radio);
case NRF_802154_TX_ERROR_NO_MEM:
return -ENOBUFS;
result = -ENOBUFS;
case NRF_802154_TX_ERROR_BUSY_CHANNEL:
return -EBUSY;
result = -EBUSY;
case NRF_802154_TX_ERROR_INVALID_ACK:
case NRF_802154_TX_ERROR_NO_ACK:
return -ENOMSG;
result = -ENOMSG;
case NRF_802154_TX_ERROR_ABORTED:
case NRF_802154_TX_ERROR_TIMESLOT_DENIED:
case NRF_802154_TX_ERROR_TIMESLOT_ENDED:
return -EIO;
default:
result = -EIO;
}
return -EIO;
#if NRF_802154_ENCRYPTION_ENABLED
/*
* When frame encryption by the radio driver is enabled,
* the frame stored in the tx_psdu buffer is authenticated
* and encrypted in place. After an unsuccessful TX attempt,
* this frame must be propagated back to the upper layer
* for retransmission. The upper layer must ensure that the
* excact same secured frame is used for retransmission.
*/
memcpy(payload, nrf5_radio->tx_psdu + 1, payload_len);
#endif
return result;
}
static uint64_t nrf5_get_time(const struct device *dev)