1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c
new file mode 100644
index 000000000..4555a35d0
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tbf.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+int lan966x_tbf_add(struct lan966x_port *port,
+		    struct tc_tbf_qopt_offload *qopt)
+{
+	struct lan966x *lan966x = port->lan966x;
+	bool root = qopt->parent == TC_H_ROOT;
+	u32 queue = 0;
+	u32 cir, cbs;
+	u32 se_idx;
+
+	if (!root) {
+		queue = TC_H_MIN(qopt->parent) - 1;
+		if (queue >= NUM_PRIO_QUEUES)
+			return -EOPNOTSUPP;
+	}
+
+	if (root)
+		se_idx = SE_IDX_PORT + port->chip_port;
+	else
+		se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + queue;
+
+	cir = div_u64(qopt->replace_params.rate.rate_bytes_ps, 1000) * 8;
+	cbs = qopt->replace_params.max_size;
+
+	/* Rate unit is 100 kbps */
+	cir = DIV_ROUND_UP(cir, 100);
+	/* Avoid using zero rate */
+	cir = cir ?: 1;
+	/* Burst unit is 4kB */
+	cbs = DIV_ROUND_UP(cbs, 4096);
+	/* Avoid using zero burst */
+	cbs = cbs ?: 1;
+
+	/* Check that actually the result can be written */
+	if (cir > GENMASK(15, 0) ||
+	    cbs > GENMASK(6, 0))
+		return -EINVAL;
+
+	lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(0) |
+		QSYS_SE_CFG_SE_FRM_MODE_SET(1),
+		QSYS_SE_CFG_SE_AVB_ENA |
+		QSYS_SE_CFG_SE_FRM_MODE,
+		lan966x, QSYS_SE_CFG(se_idx));
+
+	lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(cir) |
+	       QSYS_CIR_CFG_CIR_BURST_SET(cbs),
+	       lan966x, QSYS_CIR_CFG(se_idx));
+
+	return 0;
+}
+
+int lan966x_tbf_del(struct lan966x_port *port,
+		    struct tc_tbf_qopt_offload *qopt)
+{
+	struct lan966x *lan966x = port->lan966x;
+	bool root = qopt->parent == TC_H_ROOT;
+	u32 queue = 0;
+	u32 se_idx;
+
+	if (!root) {
+		queue = TC_H_MIN(qopt->parent) - 1;
+		if (queue >= NUM_PRIO_QUEUES)
+			return -EOPNOTSUPP;
+	}
+
+	if (root)
+		se_idx = SE_IDX_PORT + port->chip_port;
+	else
+		se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + queue;
+
+	lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(0) |
+		QSYS_SE_CFG_SE_FRM_MODE_SET(0),
+		QSYS_SE_CFG_SE_AVB_ENA |
+		QSYS_SE_CFG_SE_FRM_MODE,
+		lan966x, QSYS_SE_CFG(se_idx));
+
+	lan_wr(QSYS_CIR_CFG_CIR_RATE_SET(0) |
+	       QSYS_CIR_CFG_CIR_BURST_SET(0),
+	       lan966x, QSYS_CIR_CFG(se_idx));
+
+	return 0;
+}