realtek: dsa: Record number of supported MSTs

Each SoC supports a different number of MST(I)s. The code must know this
limitation to correctly reject unsupported MSTIs or to allocate a large
enough mapping table.

Signed-off-by: Sven Eckelmann <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20421
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/common.c

@@ -1467,6 +1467,7 @@ static int __init rtl83xx_sw_probe(struct platform_device *pdev)
 		rtl8380_get_version(priv);
 		priv->ds->num_lag_ids = 8;
 		priv->l2_bucket_size = 4;
+		priv->n_mst = 64;
 		priv->n_pie_blocks = 12;
 		priv->port_ignore = 0x1f;
 		priv->n_counters = 128;
@@ -1483,6 +1484,7 @@ static int __init rtl83xx_sw_probe(struct platform_device *pdev)
 		rtl8390_get_version(priv);
 		priv->ds->num_lag_ids = 16;
 		priv->l2_bucket_size = 4;
+		priv->n_mst = 256;
 		priv->n_pie_blocks = 18;
 		priv->port_ignore = 0x3f;
 		priv->n_counters = 1024;
@@ -1503,6 +1505,7 @@ static int __init rtl83xx_sw_probe(struct platform_device *pdev)
 		priv->ds->num_lag_ids = 16;
 		sw_w32(0, RTL930X_ST_CTRL);
 		priv->l2_bucket_size = 8;
+		priv->n_mst = 64;
 		priv->n_pie_blocks = 16;
 		priv->port_ignore = 0x3f;
 		priv->n_counters = 2048;
@@ -1523,6 +1526,7 @@ static int __init rtl83xx_sw_probe(struct platform_device *pdev)
 		priv->ds->num_lag_ids = 16;
 		sw_w32(0, RTL931x_ST_CTRL);
 		priv->l2_bucket_size = 8;
+		priv->n_mst = 128;
 		priv->n_pie_blocks = 16;
 		priv->port_ignore = 0x3f;
 		priv->n_counters = 2048;

target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h

@@ -1215,6 +1215,7 @@ struct rtl838x_switch_priv {
 	u64 irq_mask;
 	u32 fib_entries;
 	int l2_bucket_size;
+	u16 n_mst;
 	struct dentry *dbgfs_dir;
 
 	/** @lags_port_members: Port (bit) is part of a specific LAG */