net: mscc: ocelot: minimize definitions for stats

The current definition of struct ocelot_stat_layout is long-winded (4
lines per entry, and we have hundreds of entries), so we could make an
effort to use the C preprocessor and reduce the line count.

Create an implicit correspondence between enum ocelot_reg, which tells
us the register address (SYS_COUNT_RX_OCTETS etc) and enum ocelot_stat
which allows us to index the ocelot->stats array (OCELOT_STAT_RX_OCTETS
etc), and don't require us to specify both when we define what stats
each switch family has.

Create an OCELOT_STAT() macro that pairs only an enum ocelot_stat to an
enum ocelot_reg, and an OCELOT_STAT_ETHTOOL() macro which also contains
a name exported to the unstructured ethtool -S stringset API. For now,
we define all counters as having the OCELOT_STAT_ETHTOOL() kind, but we
will add more counters in the future which are not exported to the
unstructured ethtool -S.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/soc/mscc/ocelot.h

@@ -698,6 +698,17 @@ struct ocelot_stat_layout {
 	char name[ETH_GSTRING_LEN];
 };
 
+/* 32-bit counter checked for wraparound by ocelot_port_update_stats()
+ * and copied to ocelot->stats.
+ */
+#define OCELOT_STAT(kind) \
+	[OCELOT_STAT_ ## kind] = { .reg = SYS_COUNT_ ## kind }
+/* Same as above, except also exported to ethtool -S. Standard counters should
+ * only be exposed to more specific interfaces rather than by their string name.
+ */
+#define OCELOT_STAT_ETHTOOL(kind, ethtool_name) \
+	[OCELOT_STAT_ ## kind] = { .reg = SYS_COUNT_ ## kind, .name = ethtool_name }
+
 struct ocelot_stats_region {
 	struct list_head node;
 	u32 base;