1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c b/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c
new file mode 100644
index 000000000..70cbbf8d2
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_cbs.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include "lan966x_main.h"
+
+int lan966x_cbs_add(struct lan966x_port *port,
+		    struct tc_cbs_qopt_offload *qopt)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u32 cir, cbs;
+	u8 se_idx;
+
+	/* Check for invalid values */
+	if (qopt->idleslope <= 0 ||
+	    qopt->sendslope >= 0 ||
+	    qopt->locredit >= qopt->hicredit)
+		return -EINVAL;
+
+	se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
+	cir = qopt->idleslope;
+	cbs = (qopt->idleslope - qopt->sendslope) *
+		(qopt->hicredit - qopt->locredit) /
+		-qopt->sendslope;
+
+	/* 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(1) |
+		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_cbs_del(struct lan966x_port *port,
+		    struct tc_cbs_qopt_offload *qopt)
+{
+	struct lan966x *lan966x = port->lan966x;
+	u8 se_idx;
+
+	se_idx = SE_IDX_QUEUE + port->chip_port * NUM_PRIO_QUEUES + qopt->queue;
+
+	lan_rmw(QSYS_SE_CFG_SE_AVB_ENA_SET(1) |
+		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;
+}