1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c
new file mode 100644
index 000000000000..8310d3f35404
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ets.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+#define DWRR_COST_BIT_WIDTH	BIT(5)
+
+static u32 lan966x_ets_hw_cost(u32 w_min, u32 weight)
+{
+	u32 res;
+
+	/* Round half up: Multiply with 16 before division,
+	 * add 8 and divide result with 16 again
+	 */
+	res = (((DWRR_COST_BIT_WIDTH << 4) * w_min / weight) + 8) >> 4;
+	return max_t(u32, 1, res) - 1;
+}
+
+int lan966x_ets_add(struct lan966x_port *port,
+		    struct tc_ets_qopt_offload *qopt)
+{
+	struct tc_ets_qopt_offload_replace_params *params;
+	struct lan966x *lan966x = port->lan966x;
+	u32 w_min = 100;
+	u8 count = 0;
+	u32 se_idx;
+	u8 i;
+
+	/* Check the input */
+	if (qopt->parent != TC_H_ROOT)
+		return -EINVAL;
+
+	params = &qopt->replace_params;
+	if (params->bands != NUM_PRIO_QUEUES)
+		return -EINVAL;
+
+	for (i = 0; i < params->bands; ++i) {
+		/* In the switch the DWRR is always on the lowest consecutive
+		 * priorities. Due to this, the first priority must map to the
+		 * first DWRR band.
+		 */
+		if (params->priomap[i] != (7 - i))
+			return -EINVAL;
+
+		if (params->quanta[i] && params->weights[i] == 0)
+			return -EINVAL;
+	}
+
+	se_idx = SE_IDX_PORT + port->chip_port;
+
+	/* Find minimum weight */
+	for (i = 0; i < params->bands; ++i) {
+		if (params->quanta[i] == 0)
+			continue;
+
+		w_min = min(w_min, params->weights[i]);
+	}
+
+	for (i = 0; i < params->bands; ++i) {
+		if (params->quanta[i] == 0)
+			continue;
+
+		++count;
+
+		lan_wr(lan966x_ets_hw_cost(w_min, params->weights[i]),
+		       lan966x, QSYS_SE_DWRR_CFG(se_idx, 7 - i));
+	}
+
+	lan_rmw(QSYS_SE_CFG_SE_DWRR_CNT_SET(count) |
+		QSYS_SE_CFG_SE_RR_ENA_SET(0),
+		QSYS_SE_CFG_SE_DWRR_CNT |
+		QSYS_SE_CFG_SE_RR_ENA,
+		lan966x, QSYS_SE_CFG(se_idx));
+
+	return 0;
+}
+
+int lan966x_ets_del(struct lan966x_port *port,
+		    struct tc_ets_qopt_offload *qopt)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u32 se_idx;
+	int i;
+
+	se_idx = SE_IDX_PORT + port->chip_port;
+
+	for (i = 0; i < NUM_PRIO_QUEUES; ++i)
+		lan_wr(0, lan966x, QSYS_SE_DWRR_CFG(se_idx, i));
+
+	lan_rmw(QSYS_SE_CFG_SE_DWRR_CNT_SET(0) |
+		QSYS_SE_CFG_SE_RR_ENA_SET(0),
+		QSYS_SE_CFG_SE_DWRR_CNT |
+		QSYS_SE_CFG_SE_RR_ENA,
+		lan966x, QSYS_SE_CFG(se_idx));
+
+	return 0;
+}