net/sched: taprio: replace tc_taprio_qopt_offload :: enable with a "cmd" enum

Inspired from struct flow_cls_offload :: cmd, in order for taprio to be
able to report statistics (which is future work), it seems that we need
to drill one step further with the ndo_setup_tc(TC_SETUP_QDISC_TAPRIO)
multiplexing, and pass the command as part of the common portion of the
muxed structure.

Since we already have an "enable" variable in tc_taprio_qopt_offload,
refactor all drivers to check for "cmd" instead of "enable", and reject
every other command except "replace" and "destroy" - to be future proof.

Signed-off-by: Vladimir Oltean <[email protected]>
Reviewed-by: Horatiu Vultur <[email protected]> # for lan966x
Acked-by: Kurt Kanzenbach <[email protected]> # hellcreek
Reviewed-by: Muhammad Husaini Zulkifli <[email protected]>
Reviewed-by: Gerhard Engleder <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index c5ef1edcf548..88145c30c919 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -6113,9 +6113,18 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
 	size_t n;
 	int i;
 
-	adapter->qbv_enable = qopt->enable;
+	switch (qopt->cmd) {
+	case TAPRIO_CMD_REPLACE:
+		adapter->qbv_enable = true;
+		break;
+	case TAPRIO_CMD_DESTROY:
+		adapter->qbv_enable = false;
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
 
-	if (!qopt->enable)
+	if (!adapter->qbv_enable)
 		return igc_tsn_clear_schedule(adapter);
 
 	if (qopt->base_time < 0)