net: microchip: sparx5: add support for service policers

Add initial API for configuring policers. This patch add support for
service policers.
Signed-off-by: NDaniel Machon <daniel.machon@microchip.com>
Reviewed-by: NSimon Horman <simon.horman@corigine.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/sparx5/Makefile

@@ -10,7 +10,7 @@ sparx5-switch-y  := sparx5_main.o sparx5_packet.o \
  sparx5_switchdev.o sparx5_calendar.o sparx5_ethtool.o sparx5_fdma.o \
  sparx5_ptp.o sparx5_pgid.o sparx5_tc.o sparx5_qos.o \
  sparx5_vcap_impl.o sparx5_vcap_ag_api.o sparx5_tc_flower.o \
- sparx5_tc_matchall.o sparx5_pool.o sparx5_sdlb.o
+ sparx5_tc_matchall.o sparx5_pool.o sparx5_sdlb.o sparx5_police.o
 
 sparx5-switch-$(CONFIG_SPARX5_DCB) += sparx5_dcb.o
 sparx5-switch-$(CONFIG_DEBUG_FS) += sparx5_vcap_debugfs.o

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

@@ -455,6 +455,22 @@ int sparx5_sdlb_group_del(struct sparx5 *sparx5, u32 group, u32 idx);
 
 void sparx5_sdlb_group_init(struct sparx5 *sparx5, u64 max_rate, u32 min_burst,
 			    u32 frame_size, u32 idx);
+/* sparx5_police.c */
+enum {
+	/* More policer types will be added later */
+	SPX5_POL_SERVICE
+};
+
+struct sparx5_policer {
+	u32 type;
+	u32 idx;
+	u64 rate;
+	u32 burst;
+	u32 group;
+	u8 event_mask;
+};
+
+int sparx5_policer_conf_set(struct sparx5 *sparx5, struct sparx5_policer *pol);
 
 /* Clock period in picoseconds */
 static inline u32 sparx5_clk_period(enum sparx5_core_clockfreq cclock)

drivers/net/ethernet/microchip/sparx5/sparx5_police.c

+// SPDX-License-Identifier: GPL-2.0+
+/* Microchip Sparx5 Switch driver
+ *
+ * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.
+ */
+
+#include "sparx5_main_regs.h"
+#include "sparx5_main.h"
+
+static int sparx5_policer_service_conf_set(struct sparx5 *sparx5,
+					   struct sparx5_policer *pol)
+{
+	u32 idx, pup_tokens, max_pup_tokens, burst, thres;
+	struct sparx5_sdlb_group *g;
+	u64 rate;
+
+	g = &sdlb_groups[pol->group];
+	idx = pol->idx;
+
+	rate = pol->rate * 1000;
+	burst = pol->burst;
+
+	pup_tokens = sparx5_sdlb_pup_token_get(sparx5, g->pup_interval, rate);
+	max_pup_tokens =
+		sparx5_sdlb_pup_token_get(sparx5, g->pup_interval, g->max_rate);
+
+	thres = DIV_ROUND_UP(burst, g->min_burst);
+
+	spx5_wr(ANA_AC_SDLB_PUP_TOKENS_PUP_TOKENS_SET(pup_tokens), sparx5,
+		ANA_AC_SDLB_PUP_TOKENS(idx, 0));
+
+	spx5_rmw(ANA_AC_SDLB_INH_CTRL_PUP_TOKENS_MAX_SET(max_pup_tokens),
+		 ANA_AC_SDLB_INH_CTRL_PUP_TOKENS_MAX, sparx5,
+		 ANA_AC_SDLB_INH_CTRL(idx, 0));
+
+	spx5_rmw(ANA_AC_SDLB_THRES_THRES_SET(thres), ANA_AC_SDLB_THRES_THRES,
+		 sparx5, ANA_AC_SDLB_THRES(idx, 0));
+
+	return 0;
+}
+
+int sparx5_policer_conf_set(struct sparx5 *sparx5, struct sparx5_policer *pol)
+{
+	/* More policer types will be added later */
+	switch (pol->type) {
+	case SPX5_POL_SERVICE:
+		return sparx5_policer_service_conf_set(sparx5, pol);
+	default:
+		break;
+	}
+
+	return 0;
+}