net: mscc: ocelot: make struct ocelot_stat_layout array indexable

The ocelot counters are 32-bit and require periodic reading, every 2
seconds, by ocelot_port_update_stats(), so that wraparounds are
detected.

Currently, the counters reported by ocelot_get_stats64() come from the
32-bit hardware counters directly, rather than from the 64-bit
accumulated ocelot->stats, and this is a problem for their integrity.

The strategy is to make ocelot_get_stats64() able to cherry-pick
individual stats from ocelot->stats the way in which it currently reads
them out from SYS_COUNT_* registers. But currently it can't, because
ocelot->stats is an opaque u64 array that's used only to feed data into
ethtool -S.

To solve that problem, we need to make ocelot->stats indexable, and
associate each element with an element of struct ocelot_stat_layout used
by ethtool -S.

This makes ocelot_stat_layout a fat (and possibly sparse) array, so we
need to change the way in which we access it. We no longer need
OCELOT_STAT_END as a sentinel, because we know the array's size
(OCELOT_NUM_STATS). We just need to skip the array elements that were
left unpopulated for the switch revision (ocelot, felix, seville).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 97 insertions, 8 deletions

diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 72b9474391da..2428bc64cb1d 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -105,11 +105,6 @@
 #define REG_RESERVED_ADDR		0xffffffff
 #define REG_RESERVED(reg)		REG(reg, REG_RESERVED_ADDR)
 
-#define for_each_stat(ocelot, stat)				\
-	for ((stat) = (ocelot)->stats_layout;			\
-	     ((stat)->name[0] != '\0');				\
-	     (stat)++)
-
 enum ocelot_target {
 	ANA = 1,
 	QS,
@@ -540,13 +535,108 @@ enum ocelot_ptp_pins {
 	TOD_ACC_PIN
 };
 
+enum ocelot_stat {
+	OCELOT_STAT_RX_OCTETS,
+	OCELOT_STAT_RX_UNICAST,
+	OCELOT_STAT_RX_MULTICAST,
+	OCELOT_STAT_RX_BROADCAST,
+	OCELOT_STAT_RX_SHORTS,
+	OCELOT_STAT_RX_FRAGMENTS,
+	OCELOT_STAT_RX_JABBERS,
+	OCELOT_STAT_RX_CRC_ALIGN_ERRS,
+	OCELOT_STAT_RX_SYM_ERRS,
+	OCELOT_STAT_RX_64,
+	OCELOT_STAT_RX_65_127,
+	OCELOT_STAT_RX_128_255,
+	OCELOT_STAT_RX_256_511,
+	OCELOT_STAT_RX_512_1023,
+	OCELOT_STAT_RX_1024_1526,
+	OCELOT_STAT_RX_1527_MAX,
+	OCELOT_STAT_RX_PAUSE,
+	OCELOT_STAT_RX_CONTROL,
+	OCELOT_STAT_RX_LONGS,
+	OCELOT_STAT_RX_CLASSIFIED_DROPS,
+	OCELOT_STAT_RX_RED_PRIO_0,
+	OCELOT_STAT_RX_RED_PRIO_1,
+	OCELOT_STAT_RX_RED_PRIO_2,
+	OCELOT_STAT_RX_RED_PRIO_3,
+	OCELOT_STAT_RX_RED_PRIO_4,
+	OCELOT_STAT_RX_RED_PRIO_5,
+	OCELOT_STAT_RX_RED_PRIO_6,
+	OCELOT_STAT_RX_RED_PRIO_7,
+	OCELOT_STAT_RX_YELLOW_PRIO_0,
+	OCELOT_STAT_RX_YELLOW_PRIO_1,
+	OCELOT_STAT_RX_YELLOW_PRIO_2,
+	OCELOT_STAT_RX_YELLOW_PRIO_3,
+	OCELOT_STAT_RX_YELLOW_PRIO_4,
+	OCELOT_STAT_RX_YELLOW_PRIO_5,
+	OCELOT_STAT_RX_YELLOW_PRIO_6,
+	OCELOT_STAT_RX_YELLOW_PRIO_7,
+	OCELOT_STAT_RX_GREEN_PRIO_0,
+	OCELOT_STAT_RX_GREEN_PRIO_1,
+	OCELOT_STAT_RX_GREEN_PRIO_2,
+	OCELOT_STAT_RX_GREEN_PRIO_3,
+	OCELOT_STAT_RX_GREEN_PRIO_4,
+	OCELOT_STAT_RX_GREEN_PRIO_5,
+	OCELOT_STAT_RX_GREEN_PRIO_6,
+	OCELOT_STAT_RX_GREEN_PRIO_7,
+	OCELOT_STAT_TX_OCTETS,
+	OCELOT_STAT_TX_UNICAST,
+	OCELOT_STAT_TX_MULTICAST,
+	OCELOT_STAT_TX_BROADCAST,
+	OCELOT_STAT_TX_COLLISION,
+	OCELOT_STAT_TX_DROPS,
+	OCELOT_STAT_TX_PAUSE,
+	OCELOT_STAT_TX_64,
+	OCELOT_STAT_TX_65_127,
+	OCELOT_STAT_TX_128_255,
+	OCELOT_STAT_TX_256_511,
+	OCELOT_STAT_TX_512_1023,
+	OCELOT_STAT_TX_1024_1526,
+	OCELOT_STAT_TX_1527_MAX,
+	OCELOT_STAT_TX_YELLOW_PRIO_0,
+	OCELOT_STAT_TX_YELLOW_PRIO_1,
+	OCELOT_STAT_TX_YELLOW_PRIO_2,
+	OCELOT_STAT_TX_YELLOW_PRIO_3,
+	OCELOT_STAT_TX_YELLOW_PRIO_4,
+	OCELOT_STAT_TX_YELLOW_PRIO_5,
+	OCELOT_STAT_TX_YELLOW_PRIO_6,
+	OCELOT_STAT_TX_YELLOW_PRIO_7,
+	OCELOT_STAT_TX_GREEN_PRIO_0,
+	OCELOT_STAT_TX_GREEN_PRIO_1,
+	OCELOT_STAT_TX_GREEN_PRIO_2,
+	OCELOT_STAT_TX_GREEN_PRIO_3,
+	OCELOT_STAT_TX_GREEN_PRIO_4,
+	OCELOT_STAT_TX_GREEN_PRIO_5,
+	OCELOT_STAT_TX_GREEN_PRIO_6,
+	OCELOT_STAT_TX_GREEN_PRIO_7,
+	OCELOT_STAT_TX_AGED,
+	OCELOT_STAT_DROP_LOCAL,
+	OCELOT_STAT_DROP_TAIL,
+	OCELOT_STAT_DROP_YELLOW_PRIO_0,
+	OCELOT_STAT_DROP_YELLOW_PRIO_1,
+	OCELOT_STAT_DROP_YELLOW_PRIO_2,
+	OCELOT_STAT_DROP_YELLOW_PRIO_3,
+	OCELOT_STAT_DROP_YELLOW_PRIO_4,
+	OCELOT_STAT_DROP_YELLOW_PRIO_5,
+	OCELOT_STAT_DROP_YELLOW_PRIO_6,
+	OCELOT_STAT_DROP_YELLOW_PRIO_7,
+	OCELOT_STAT_DROP_GREEN_PRIO_0,
+	OCELOT_STAT_DROP_GREEN_PRIO_1,
+	OCELOT_STAT_DROP_GREEN_PRIO_2,
+	OCELOT_STAT_DROP_GREEN_PRIO_3,
+	OCELOT_STAT_DROP_GREEN_PRIO_4,
+	OCELOT_STAT_DROP_GREEN_PRIO_5,
+	OCELOT_STAT_DROP_GREEN_PRIO_6,
+	OCELOT_STAT_DROP_GREEN_PRIO_7,
+	OCELOT_NUM_STATS,
+};
+
 struct ocelot_stat_layout {
 	u32 offset;
 	char name[ETH_GSTRING_LEN];
 };
 
-#define OCELOT_STAT_END { .name = "" }
-
 struct ocelot_stats_region {
 	struct list_head node;
 	u32 offset;
@@ -709,7 +799,6 @@ struct ocelot {
 	const u32 *const		*map;
 	const struct ocelot_stat_layout	*stats_layout;
 	struct list_head		stats_regions;
-	unsigned int			num_stats;
 
 	u32				pool_size[OCELOT_SB_NUM][OCELOT_SB_POOL_NUM];
 	int				packet_buffer_size;