[openwrt/openwrt] realtek: dsa: add table-based statistics infrastructure

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/fdc424c1e32b50e05ba38cbc00e62b19d869e510

commit fdc424c1e32b50e05ba38cbc00e62b19d869e510
Author: Sharadanand Karanjkar <sk at simonwunderlich.de>
AuthorDate: Thu Aug 14 15:48:14 2025 +0000

    realtek: dsa: add table-based statistics infrastructure
    
    Some Realtek SoCs such as the RTL931X store MIB counters in tables rather
    than registers. Unlike register reads, table access requires programming
    the table control register, setting the command field to determine read or
    write, and then polling for completion. This makes it necessary to
    implement a separate path for table-based statistics.
    
    Like register-based MIBs, the table-based MIBs also come in two types: STD
    and PRIV which will require slightly different implementations.
    
    Signed-off-by: Sharadanand Karanjkar <sk at simonwunderlich.de>
    Signed-off-by: Sven Eckelmann <se at simonwunderlich.de>
    Link: https://github.com/openwrt/openwrt/pull/20631
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c    | 9 +++++++++
 .../linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h   | 1 +
 .../linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl83xx.h   | 4 +++-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c
index 6468f9a483..6d2dcbe609 100644
--- a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c
+++ b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/dsa.c
@@ -880,6 +880,15 @@ static bool rtldsa_read_mib_item(struct rtl838x_switch_priv *priv, int port,
 		reg = priv->r->stat_port_prv_mib;
 		reg_offset = 128;
 		break;
+	case MIB_TBL_STD:
+	case MIB_TBL_PRV:
+		if (!priv->r->stat_port_table_read)
+			return false;
+
+		*data = priv->r->stat_port_table_read(port, mib_item->size, mib_item->offset,
+						      mib_item->reg == MIB_TBL_PRV);
+
+		return true;
 	default:
 		return false;
 	}
diff --git a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h
index 4120f5ff48..e3f894ad6d 100644
--- a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h
+++ b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl838x.h
@@ -1121,6 +1121,7 @@ struct rtl838x_reg {
 	int stat_rst;
 	int stat_port_std_mib;
 	int stat_port_prv_mib;
+	u64 (*stat_port_table_read)(int port, unsigned int mib_size, unsigned int offset, bool is_pvt);
 	int (*port_iso_ctrl)(int p);
 	void (*traffic_enable)(int source, int dest);
 	void (*traffic_disable)(int source, int dest);
diff --git a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl83xx.h b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl83xx.h
index 5b98c85848..1b04c65708 100644
--- a/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl83xx.h
+++ b/target/linux/realtek/files-6.12/drivers/net/dsa/rtl83xx/rtl83xx.h
@@ -20,7 +20,9 @@ struct fdb_update_work {
 enum mib_reg {
 	MIB_REG_INVALID = 0,
 	MIB_REG_STD,
-	MIB_REG_PRV
+	MIB_REG_PRV,
+	MIB_TBL_STD,
+	MIB_TBL_PRV,
 };
 
 #define MIB_ITEM(_reg, _offset, _size) \