[PATCH net-next 6/7] net: dsa: felix: act upon the mqprio qopt in taprio offload

[Vladimir Oltean]

The mqprio queue configuration can appear either through
TC_SETUP_QDISC_MQPRIO or through TC_SETUP_QDISC_TAPRIO. Make sure both
are treated in the same way.

Code does nothing new for now (except for rejecting multiple TXQs per
TC, which is a useless concept with DSA switches).

Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
Reviewed-by: Ferenc Fejes <fejes@xxxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
---
Diff vs
https://lore.kernel.org/netdev/20230220122343.1156614-12-vladimir.oltean@xxxxxxx/:
none

 drivers/net/dsa/ocelot/felix_vsc9959.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 66ec2740e3cb..e055b3980ccc 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1424,6 +1424,7 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
 	mutex_lock(&ocelot->tas_lock);
 
 	if (!taprio->enable) {
+		ocelot_port_mqprio(ocelot, port, &taprio->mqprio);
 		ocelot_rmw_rix(ocelot, 0, QSYS_TAG_CONFIG_ENABLE,
 			       QSYS_TAG_CONFIG, port);
 
@@ -1436,15 +1437,19 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
 		return 0;
 	}
 
+	ret = ocelot_port_mqprio(ocelot, port, &taprio->mqprio);
+	if (ret)
+		goto err_unlock;
+
 	if (taprio->cycle_time > NSEC_PER_SEC ||
 	    taprio->cycle_time_extension >= NSEC_PER_SEC) {
 		ret = -EINVAL;
-		goto err;
+		goto err_reset_tc;
 	}
 
 	if (taprio->num_entries > VSC9959_TAS_GCL_ENTRY_MAX) {
 		ret = -ERANGE;
-		goto err;
+		goto err_reset_tc;
 	}
 
 	/* Enable guard band. The switch will schedule frames without taking
@@ -1468,7 +1473,7 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
 	val = ocelot_read(ocelot, QSYS_PARAM_STATUS_REG_8);
 	if (val & QSYS_PARAM_STATUS_REG_8_CONFIG_PENDING) {
 		ret = -EBUSY;
-		goto err;
+		goto err_reset_tc;
 	}
 
 	ocelot_rmw_rix(ocelot,
@@ -1503,12 +1508,19 @@ static int vsc9959_qos_port_tas_set(struct ocelot *ocelot, int port,
 				 !(val & QSYS_TAS_PARAM_CFG_CTRL_CONFIG_CHANGE),
 				 10, 100000);
 	if (ret)
-		goto err;
+		goto err_reset_tc;
 
 	ocelot_port->taprio = taprio_offload_get(taprio);
 	vsc9959_tas_guard_bands_update(ocelot, port);
 
-err:
+	mutex_unlock(&ocelot->tas_lock);
+
+	return 0;
+
+err_reset_tc:
+	taprio->mqprio.qopt.num_tc = 0;
+	ocelot_port_mqprio(ocelot, port, &taprio->mqprio);
+err_unlock:
 	mutex_unlock(&ocelot->tas_lock);
 
 	return ret;
-- 
2.34.1