sfc: only advertise TX timestamping if we have the license for it

We check the license for TX hardware timestamping capability.
The PTP probe will have enabled PTP sync events from the adapter.  If
 later, at TX queue init, it turns out we do not have the license, we
 don't need the sync events either.
Signed-off-by: Martin Habets <mhabets@solarflare.com>
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ef10.c

@@ -2433,8 +2433,12 @@ static void efx_ef10_tx_init(struct efx_tx_queue *tx_queue)
 	 * otherwise TXQ init will fail
 	 */
 	if (!(nic_data->licensed_features &
-	      (1 << LICENSED_V3_FEATURES_TX_TIMESTAMPS_LBN)))
+	      (1 << LICENSED_V3_FEATURES_TX_TIMESTAMPS_LBN))) {
 		tx_queue->timestamping = false;
+		/* Disable sync events on this channel. */
+		if (efx->type->ptp_set_ts_sync_events)
+			efx->type->ptp_set_ts_sync_events(efx, false, false);
+	}
 
 	/* TSOv2 is a limited resource that can only be configured on a limited
 	 * number of queues. TSO without checksum offload is not really a thing,

drivers/net/ethernet/sfc/ptp.c

@@ -1657,6 +1657,17 @@ void efx_ptp_get_ts_info(struct efx_nic *efx, struct ethtool_ts_info *ts_info)
 	ts_info->so_timestamping |= (SOF_TIMESTAMPING_TX_HARDWARE |
 				     SOF_TIMESTAMPING_RX_HARDWARE |
 				     SOF_TIMESTAMPING_RAW_HARDWARE);
+	/* Check licensed features.  If we don't have the license for TX
+	 * timestamps, the NIC will not support them.
+	 */
+	if (efx_ptp_use_mac_tx_timestamps(efx)) {
+		struct efx_ef10_nic_data *nic_data = efx->nic_data;
+
+		if (!(nic_data->licensed_features &
+		      (1 << LICENSED_V3_FEATURES_TX_TIMESTAMPS_LBN)))
+			ts_info->so_timestamping &=
+				~SOF_TIMESTAMPING_TX_HARDWARE;
+	}
 	if (primary && primary->ptp_data && primary->ptp_data->phc_clock)
 		ts_info->phc_index =
 			ptp_clock_index(primary->ptp_data->phc_clock);