[PATCH net-next 10/13] tsnep: deny tc-taprio changes to per-tc max SDU

[Vladimir Oltean]

Since the driver does not act upon the max_sdu argument, deny any other
values except the default all-zeroes, which means that all traffic
classes should use the same MTU as the port itself.

Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
---
 drivers/net/ethernet/engleder/tsnep_tc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/engleder/tsnep_tc.c b/drivers/net/ethernet/engleder/tsnep_tc.c
index c4c6e1357317..82df837ffc54 100644
--- a/drivers/net/ethernet/engleder/tsnep_tc.c
+++ b/drivers/net/ethernet/engleder/tsnep_tc.c
@@ -320,11 +320,15 @@ static int tsnep_taprio(struct tsnep_adapter *adapter,
 {
 	struct tsnep_gcl *gcl;
 	struct tsnep_gcl *curr;
-	int retval;
+	int retval, tc;
 
 	if (!adapter->gate_control)
 		return -EOPNOTSUPP;
 
+	for (tc = 0; tc < TC_MAX_QUEUE; tc++)
+		if (qopt->max_sdu[tc])
+			return -EOPNOTSUPP;
+
 	if (!qopt->enable) {
 		/* disable gate control if active */
 		mutex_lock(&adapter->gate_control_lock);
-- 
2.34.1