[PATCH net-next 13/13] net: am65-cpsw: deny tc-taprio changes to per-tc max SDU

Vladimir Oltean
2022-09-14T15:35:05Z

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@nxp.com>
---
drivers/net/ethernet/ti/am65-cpsw-qos.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-qos.c b/drivers/net/ethernet/ti/am65-cpsw-qos.c
index e162771893af..bd3b425083aa 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-qos.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-qos.c
@@ -503,7 +503,11 @@ static int am65_cpsw_set_taprio(struct net_device *ndev, void *type_data)
struct am65_cpsw_port *port = am65_ndev_to_port(ndev);
struct tc_taprio_qopt_offload *taprio = type_data;
struct am65_cpsw_est *est_new;
- int ret = 0;
+ int tc, ret = 0;
+
+ for (tc = 0; tc < TC_MAX_QUEUE; tc++)
+ if (taprio->max_sdu[tc])
+ return -EOPNOTSUPP;

if (taprio->cycle_time_extension) {
dev_err(&ndev->dev, "Failed to set cycle time extension");
--
2.34.1