Merge branch 'Port-and-flow-policers-for-DSA'

Vladimir Oltean says:

====================
Port and flow policers for DSA (SJA1105, Felix/Ocelot)

This series adds support for 2 types of policers:
 - port policers, via tc matchall filter
 - flow policers, via tc flower filter
for 2 DSA drivers:
 - sja1105
 - felix/ocelot

First we start with ocelot/felix. Prior to this patch, the ocelot core
library currently only supported:
- Port policers
- Flow-based dropping and trapping
But the felix wrapper could not actually use the port policers due to
missing linkage and support in the DSA core. So one of the patches
addresses exactly that limitation by adding the missing support to the
DSA core. The other patch for felix flow policers (via the VCAP IS2
engine) is actually in the ocelot library itself, since the linkage with
the ocelot flower classifier has already been done in an earlier patch
set.

Then with the newly added .port_policer_add and .port_policer_del, we
can also start supporting the L2 policers on sja1105.

Then, for full functionality of these L2 policers on sja1105, we also
implement a more limited set of flow-based policing keys for this
switch, namely for broadcast and VLAN PCP.

Series version 1 was submitted here:
https://patchwork.ozlabs.org/cover/1263353/

Nothing functional changed in v2, only a rebase.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -13,6 +13,7 @@
 #include <linux/of_net.h>
 #include <linux/pci.h>
 #include <linux/of.h>
+#include <net/pkt_sched.h>
 #include <net/dsa.h>
 #include "felix.h"
 
@@ -650,6 +651,27 @@ static int felix_cls_flower_stats(struct dsa_switch *ds, int port,
 	return ocelot_cls_flower_stats(ocelot, port, cls, ingress);
 }
 
+static int felix_port_policer_add(struct dsa_switch *ds, int port,
+				  struct dsa_mall_policer_tc_entry *policer)
+{
+	struct ocelot *ocelot = ds->priv;
+	struct ocelot_policer pol = {
+		.rate = div_u64(policer->rate_bytes_per_sec, 1000) * 8,
+		.burst = div_u64(policer->rate_bytes_per_sec *
+				 PSCHED_NS2TICKS(policer->burst),
+				 PSCHED_TICKS_PER_SEC),
+	};
+
+	return ocelot_port_policer_add(ocelot, port, &pol);
+}
+
+static void felix_port_policer_del(struct dsa_switch *ds, int port)
+{
+	struct ocelot *ocelot = ds->priv;
+
+	ocelot_port_policer_del(ocelot, port);
+}
+
 static const struct dsa_switch_ops felix_switch_ops = {
 	.get_tag_protocol	= felix_get_tag_protocol,
 	.setup			= felix_setup,
@@ -683,6 +705,8 @@ static const struct dsa_switch_ops felix_switch_ops = {
 	.port_txtstamp		= felix_txtstamp,
 	.port_change_mtu	= felix_change_mtu,
 	.port_max_mtu		= felix_get_max_mtu,
+	.port_policer_add	= felix_port_policer_add,
+	.port_policer_del	= felix_port_policer_del,
 	.cls_flower_add		= felix_cls_flower_add,
 	.cls_flower_del		= felix_cls_flower_del,
 	.cls_flower_stats	= felix_cls_flower_stats,

drivers/net/dsa/sja1105/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_NET_DSA_SJA1105) += sja1105.o
 sja1105-objs := \
     sja1105_spi.o \
     sja1105_main.o \
+    sja1105_flower.o \
     sja1105_ethtool.o \
     sja1105_clocking.o \
     sja1105_static_config.o \

drivers/net/dsa/sja1105/sja1105.h

@@ -19,6 +19,7 @@
  * The passed parameter is in multiples of 1 ms.
  */
 #define SJA1105_AGEING_TIME_MS(ms)	((ms) / 10)
+#define SJA1105_NUM_L2_POLICERS		45
 
 typedef enum {
 	SPI_READ = 0,
@@ -95,6 +96,36 @@ struct sja1105_info {
 	const char *name;
 };
 
+enum sja1105_rule_type {
+	SJA1105_RULE_BCAST_POLICER,
+	SJA1105_RULE_TC_POLICER,
+};
+
+struct sja1105_rule {
+	struct list_head list;
+	unsigned long cookie;
+	unsigned long port_mask;
+	enum sja1105_rule_type type;
+
+	union {
+		/* SJA1105_RULE_BCAST_POLICER */
+		struct {
+			int sharindx;
+		} bcast_pol;
+
+		/* SJA1105_RULE_TC_POLICER */
+		struct {
+			int sharindx;
+			int tc;
+		} tc_pol;
+	};
+};
+
+struct sja1105_flow_block {
+	struct list_head rules;
+	bool l2_policer_used[SJA1105_NUM_L2_POLICERS];
+};
+
 struct sja1105_private {
 	struct sja1105_static_config static_config;
 	bool rgmii_rx_delay[SJA1105_NUM_PORTS];
@@ -103,6 +134,7 @@ struct sja1105_private {
 	struct gpio_desc *reset_gpio;
 	struct spi_device *spidev;
 	struct dsa_switch *ds;
+	struct sja1105_flow_block flow_block;
 	struct sja1105_port ports[SJA1105_NUM_PORTS];
 	/* Serializes transmission of management frames so that
 	 * the switch doesn't confuse them with one another.
@@ -222,4 +254,12 @@ size_t sja1105pqrs_mac_config_entry_packing(void *buf, void *entry_ptr,
 size_t sja1105pqrs_avb_params_entry_packing(void *buf, void *entry_ptr,
 					    enum packing_op op);
 
+/* From sja1105_flower.c */
+int sja1105_cls_flower_del(struct dsa_switch *ds, int port,
+			   struct flow_cls_offload *cls, bool ingress);
+int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
+			   struct flow_cls_offload *cls, bool ingress);
+void sja1105_flower_setup(struct dsa_switch *ds);
+void sja1105_flower_teardown(struct dsa_switch *ds);
+
 #endif