Merge branch 'ocelot-felix-driver-cleanup'

Vladimir Oltean says:

====================
Ocelot/Felix driver cleanup

The cleanup mostly handles the statistics code path - some issues
regarding understandability became apparent after the series
"Fix trainwreck with Ocelot switch statistics counters":
https://lore.kernel.org/netdev/20230321010325.897817-1-vladimir.oltean@nxp.com/

There is also one patch which cleans up a misleading comment
in the DSA felix_setup().
====================

Link: https://lore.kernel.org/r/20230412124737.2243527-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/dsa/ocelot/felix.c

@@ -1550,11 +1550,6 @@ static int felix_connect_tag_protocol(struct dsa_switch *ds,
 	}
 }
 
-/* Hardware initialization done here so that we can allocate structures with
- * devm without fear of dsa_register_switch returning -EPROBE_DEFER and causing
- * us to allocate structures twice (leak memory) and map PCI memory twice
- * (which will not work).
- */
 static int felix_setup(struct dsa_switch *ds)
 {
 	struct ocelot *ocelot = ds->priv;

drivers/net/ethernet/mscc/ocelot.h

@@ -74,6 +74,15 @@ struct ocelot_multicast {
 	struct ocelot_pgid *pgid;
 };
 
+static inline void ocelot_reg_to_target_addr(struct ocelot *ocelot,
+					     enum ocelot_reg reg,
+					     enum ocelot_target *target,
+					     u32 *addr)
+{
+	*target = reg >> TARGET_OFFSET;
+	*addr = ocelot->map[*target][reg & REG_MASK];
+}
+
 int ocelot_bridge_num_find(struct ocelot *ocelot,
 			   const struct net_device *bridge);
 

drivers/net/ethernet/mscc/ocelot_io.c

@@ -10,57 +10,60 @@
 
 #include "ocelot.h"
 
-int __ocelot_bulk_read_ix(struct ocelot *ocelot, u32 reg, u32 offset, void *buf,
-			  int count)
+int __ocelot_bulk_read_ix(struct ocelot *ocelot, enum ocelot_reg reg,
+			  u32 offset, void *buf, int count)
 {
-	u16 target = reg >> TARGET_OFFSET;
+	enum ocelot_target target;
+	u32 addr;
 
+	ocelot_reg_to_target_addr(ocelot, reg, &target, &addr);
 	WARN_ON(!target);
 
-	return regmap_bulk_read(ocelot->targets[target],
-				ocelot->map[target][reg & REG_MASK] + offset,
+	return regmap_bulk_read(ocelot->targets[target], addr + offset,
 				buf, count);
 }
 EXPORT_SYMBOL_GPL(__ocelot_bulk_read_ix);
 
-u32 __ocelot_read_ix(struct ocelot *ocelot, u32 reg, u32 offset)
+u32 __ocelot_read_ix(struct ocelot *ocelot, enum ocelot_reg reg, u32 offset)
 {
-	u16 target = reg >> TARGET_OFFSET;
-	u32 val;
+	enum ocelot_target target;
+	u32 addr, val;
 
+	ocelot_reg_to_target_addr(ocelot, reg, &target, &addr);
 	WARN_ON(!target);
 
-	regmap_read(ocelot->targets[target],
-		    ocelot->map[target][reg & REG_MASK] + offset, &val);
+	regmap_read(ocelot->targets[target], addr + offset, &val);
 	return val;
 }
 EXPORT_SYMBOL_GPL(__ocelot_read_ix);
 
-void __ocelot_write_ix(struct ocelot *ocelot, u32 val, u32 reg, u32 offset)
+void __ocelot_write_ix(struct ocelot *ocelot, u32 val, enum ocelot_reg reg,
+		       u32 offset)
 {
-	u16 target = reg >> TARGET_OFFSET;
+	enum ocelot_target target;
+	u32 addr;
 
+	ocelot_reg_to_target_addr(ocelot, reg, &target, &addr);
 	WARN_ON(!target);
 
-	regmap_write(ocelot->targets[target],
-		     ocelot->map[target][reg & REG_MASK] + offset, val);
+	regmap_write(ocelot->targets[target], addr + offset, val);
 }
 EXPORT_SYMBOL_GPL(__ocelot_write_ix);
 
-void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask, u32 reg,
-		     u32 offset)
+void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask,
+		     enum ocelot_reg reg, u32 offset)
 {
-	u16 target = reg >> TARGET_OFFSET;
+	enum ocelot_target target;
+	u32 addr;
 
+	ocelot_reg_to_target_addr(ocelot, reg, &target, &addr);
 	WARN_ON(!target);
 
-	regmap_update_bits(ocelot->targets[target],
-			   ocelot->map[target][reg & REG_MASK] + offset,
-			   mask, val);
+	regmap_update_bits(ocelot->targets[target], addr + offset, mask, val);
 }
 EXPORT_SYMBOL_GPL(__ocelot_rmw_ix);
 
-u32 ocelot_port_readl(struct ocelot_port *port, u32 reg)
+u32 ocelot_port_readl(struct ocelot_port *port, enum ocelot_reg reg)
 {
 	struct ocelot *ocelot = port->ocelot;
 	u16 target = reg >> TARGET_OFFSET;
@@ -73,7 +76,7 @@ u32 ocelot_port_readl(struct ocelot_port *port, u32 reg)
 }
 EXPORT_SYMBOL_GPL(ocelot_port_readl);
 
-void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg)
+void ocelot_port_writel(struct ocelot_port *port, u32 val, enum ocelot_reg reg)
 {
 	struct ocelot *ocelot = port->ocelot;
 	u16 target = reg >> TARGET_OFFSET;
@@ -84,7 +87,8 @@ void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg)
 }
 EXPORT_SYMBOL_GPL(ocelot_port_writel);
 
-void ocelot_port_rmwl(struct ocelot_port *port, u32 val, u32 mask, u32 reg)
+void ocelot_port_rmwl(struct ocelot_port *port, u32 val, u32 mask,
+		      enum ocelot_reg reg)
 {
 	u32 cur = ocelot_port_readl(port, reg);
 

drivers/net/ethernet/mscc/ocelot_stats.c

@@ -145,7 +145,7 @@ enum ocelot_stat {
 };
 
 struct ocelot_stat_layout {
-	u32 reg;
+	enum ocelot_reg reg;
 	char name[ETH_GSTRING_LEN];
 };
 
@@ -257,7 +257,7 @@ struct ocelot_stat_layout {
 
 struct ocelot_stats_region {
 	struct list_head node;
-	u32 base;
+	enum ocelot_reg base;
 	enum ocelot_stat first_stat;
 	int count;
 	u32 *buf;
@@ -395,7 +395,7 @@ static void ocelot_check_stats_work(struct work_struct *work)
 void ocelot_get_strings(struct ocelot *ocelot, int port, u32 sset, u8 *data)
 {
 	const struct ocelot_stat_layout *layout;
-	int i;
+	enum ocelot_stat i;
 
 	if (sset != ETH_SS_STATS)
 		return;
@@ -442,7 +442,8 @@ out_unlock:
 int ocelot_get_sset_count(struct ocelot *ocelot, int port, int sset)
 {
 	const struct ocelot_stat_layout *layout;
-	int i, num_stats = 0;
+	enum ocelot_stat i;
+	int num_stats = 0;
 
 	if (sset != ETH_SS_STATS)
 		return -EOPNOTSUPP;
@@ -461,8 +462,8 @@ static void ocelot_port_ethtool_stats_cb(struct ocelot *ocelot, int port,
 					 void *priv)
 {
 	const struct ocelot_stat_layout *layout;
+	enum ocelot_stat i;
 	u64 *data = priv;
-	int i;
 
 	layout = ocelot_get_stats_layout(ocelot);
 
@@ -889,8 +890,8 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 {
 	struct ocelot_stats_region *region = NULL;
 	const struct ocelot_stat_layout *layout;
-	unsigned int last = 0;
-	int i;
+	enum ocelot_reg last = 0;
+	enum ocelot_stat i;
 
 	INIT_LIST_HEAD(&ocelot->stats_regions);
 
@@ -900,6 +901,17 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 		if (!layout[i].reg)
 			continue;
 
+		/* enum ocelot_stat must be kept sorted in the same order
+		 * as the addresses behind layout[i].reg in order to have
+		 * efficient bulking
+		 */
+		if (last) {
+			WARN(ocelot->map[SYS][last & REG_MASK] >= ocelot->map[SYS][layout[i].reg & REG_MASK],
+			     "reg 0x%x had address 0x%x but reg 0x%x has address 0x%x, bulking broken!",
+			     last, ocelot->map[SYS][last & REG_MASK],
+			     layout[i].reg, ocelot->map[SYS][layout[i].reg & REG_MASK]);
+		}
+
 		if (region && ocelot->map[SYS][layout[i].reg & REG_MASK] ==
 		    ocelot->map[SYS][last & REG_MASK] + 4) {
 			region->count++;
@@ -909,12 +921,6 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 			if (!region)
 				return -ENOMEM;
 
-			/* enum ocelot_stat must be kept sorted in the same
-			 * order as layout[i].reg in order to have efficient
-			 * bulking
-			 */
-			WARN_ON(last >= layout[i].reg);
-
 			region->base = layout[i].reg;
 			region->first_stat = i;
 			region->count = 1;
@@ -925,6 +931,15 @@ static int ocelot_prepare_stats_regions(struct ocelot *ocelot)
 	}
 
 	list_for_each_entry(region, &ocelot->stats_regions, node) {
+		enum ocelot_target target;
+		u32 addr;
+
+		ocelot_reg_to_target_addr(ocelot, region->base, &target,
+					  &addr);
+
+		dev_dbg(ocelot->dev,
+			"region of %d contiguous counters starting with SYS:STAT:CNT[0x%03x]\n",
+			region->count, addr / 4);
 		region->buf = devm_kcalloc(ocelot->dev, region->count,
 					   sizeof(*region->buf), GFP_KERNEL);
 		if (!region->buf)
@@ -972,4 +987,3 @@ void ocelot_stats_deinit(struct ocelot *ocelot)
 	cancel_delayed_work(&ocelot->stats_work);
 	destroy_workqueue(ocelot->stats_queue);
 }
-

include/soc/mscc/ocelot.h

@@ -940,15 +940,17 @@ struct ocelot_policer {
 	__ocelot_target_write_ix(ocelot, target, val, reg, 0)
 
 /* I/O */
-u32 ocelot_port_readl(struct ocelot_port *port, u32 reg);
-void ocelot_port_writel(struct ocelot_port *port, u32 val, u32 reg);
-void ocelot_port_rmwl(struct ocelot_port *port, u32 val, u32 mask, u32 reg);
-int __ocelot_bulk_read_ix(struct ocelot *ocelot, u32 reg, u32 offset, void *buf,
-			  int count);
-u32 __ocelot_read_ix(struct ocelot *ocelot, u32 reg, u32 offset);
-void __ocelot_write_ix(struct ocelot *ocelot, u32 val, u32 reg, u32 offset);
-void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask, u32 reg,
-		     u32 offset);
+u32 ocelot_port_readl(struct ocelot_port *port, enum ocelot_reg reg);
+void ocelot_port_writel(struct ocelot_port *port, u32 val, enum ocelot_reg reg);
+void ocelot_port_rmwl(struct ocelot_port *port, u32 val, u32 mask,
+		      enum ocelot_reg reg);
+int __ocelot_bulk_read_ix(struct ocelot *ocelot, enum ocelot_reg reg,
+			  u32 offset, void *buf, int count);
+u32 __ocelot_read_ix(struct ocelot *ocelot, enum ocelot_reg reg, u32 offset);
+void __ocelot_write_ix(struct ocelot *ocelot, u32 val, enum ocelot_reg reg,
+		       u32 offset);
+void __ocelot_rmw_ix(struct ocelot *ocelot, u32 val, u32 mask,
+		     enum ocelot_reg reg, u32 offset);
 u32 __ocelot_target_read_ix(struct ocelot *ocelot, enum ocelot_target target,
 			    u32 reg, u32 offset);
 void __ocelot_target_write_ix(struct ocelot *ocelot, enum ocelot_target target,