net: openthread: support Kconfig IEEE802154_SELECTIVE_TXCHANNEL

For transmit_message if the transmission is timed and underlying
driver supports `IEEE802154_HW_SELECTIVE_TXCHANNEL` then use
the selective txchannel feature for transmission.
This does not change the current `channel` at the moment of call,
the driver will transmit the message on the channel selected through
`net_pkt_set_ieee802154_txchannel` then (after receiving an ACK
if requested) it will return to the original channel.
When Kconfig option IEEE802154_SELECTIVE_TXCHANNEL is turned on,
the timed transmissions scheduled some time ahead on different
channel will not abort ongoing reception until the exact moment
of transmission comes.

Signed-off-by: Andrzej Kuroś <[email protected]>

Author: ankuns

modules/openthread/platform/radio.c

@@ -379,12 +379,20 @@ void platformRadioInit(void)
 	radio_api->configure(radio_dev, IEEE802154_CONFIG_EVENT_HANDLER, &cfg);
 }
 
+static void radio_set_channel(uint16_t ch)
+{
+	channel = ch;
+	radio_api->set_channel(radio_dev, ch);
+}
+
 void transmit_message(struct k_work *tx_job)
 {
 	int tx_err;
 
 	ARG_UNUSED(tx_job);
 
+	enum ieee802154_hw_caps radio_caps = radio_api->get_capabilities(radio_dev);
+
 	/*
 	 * The payload is already in tx_payload->data,
 	 * but we need to set the length field
@@ -394,10 +402,7 @@ void transmit_message(struct k_work *tx_job)
 	 */
 	tx_payload->len = sTransmitFrame.mLength - FCS_SIZE;
 
-	channel = sTransmitFrame.mChannel;
-
-	radio_api->set_channel(radio_dev, channel);
-	radio_api->set_txpower(radio_dev, get_transmit_power_for_channel(channel));
+	radio_api->set_txpower(radio_dev, get_transmit_power_for_channel(sTransmitFrame.mChannel));
 
 #if defined(CONFIG_OPENTHREAD_TIME_SYNC)
 	if (sTransmitFrame.mInfo.mTxInfo.mIeInfo->mTimeIeOffset != 0) {
@@ -415,17 +420,27 @@ void transmit_message(struct k_work *tx_job)
 					     sTransmitFrame.mInfo.mTxInfo.mIsSecurityProcessed);
 	net_pkt_set_ieee802154_mac_hdr_rdy(tx_pkt, sTransmitFrame.mInfo.mTxInfo.mIsHeaderUpdated);
 
-	if ((radio_api->get_capabilities(radio_dev) & IEEE802154_HW_TXTIME) &&
+	if ((radio_caps & IEEE802154_HW_TXTIME) &&
 	    (sTransmitFrame.mInfo.mTxInfo.mTxDelay != 0)) {
 #if defined(CONFIG_NET_PKT_TXTIME)
 		uint32_t tx_at = sTransmitFrame.mInfo.mTxInfo.mTxDelayBaseTime +
 				 sTransmitFrame.mInfo.mTxInfo.mTxDelay;
 		net_pkt_set_timestamp_ns(tx_pkt, convert_32bit_us_wrapped_to_64bit_ns(tx_at));
+#endif
+#if defined(CONFIG_IEEE802154_SELECTIVE_TXCHANNEL)
+		if (radio_caps & IEEE802154_HW_SELECTIVE_TXCHANNEL) {
+			net_pkt_set_ieee802154_txchannel(tx_pkt, sTransmitFrame.mChannel);
+		} else {
+			radio_set_channel(sTransmitFrame.mChannel);
+		}
+#else
+		radio_set_channel(sTransmitFrame.mChannel);
 #endif
 		tx_err =
 			radio_api->tx(radio_dev, IEEE802154_TX_MODE_TXTIME_CCA, tx_pkt, tx_payload);
 	} else if (sTransmitFrame.mInfo.mTxInfo.mCsmaCaEnabled) {
-		if (radio_api->get_capabilities(radio_dev) & IEEE802154_HW_CSMA) {
+		radio_set_channel(sTransmitFrame.mChannel);
+		if (radio_caps & IEEE802154_HW_CSMA) {
 			tx_err = radio_api->tx(radio_dev, IEEE802154_TX_MODE_CSMA_CA, tx_pkt,
 					       tx_payload);
 		} else {
@@ -436,6 +451,7 @@ void transmit_message(struct k_work *tx_job)
 			}
 		}
 	} else {
+		radio_set_channel(sTransmitFrame.mChannel);
 		tx_err = radio_api->tx(radio_dev, IEEE802154_TX_MODE_DIRECT, tx_pkt, tx_payload);
 	}