[PATCH net-next] net: ethernet: mtk_eth_soc: support per-flow accounting on MT7988

[Daniel Golle]

NETSYS_V3 uses 64 bits for each counters while older SoCs were using
48 bits for each counter.
Support reading per-flow byte and package counters on NETSYS_V3.

Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c  |  1 +
 drivers/net/ethernet/mediatek/mtk_ppe.c      | 18 ++++++++++++++----
 drivers/net/ethernet/mediatek/mtk_ppe_regs.h |  2 ++
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 05be702f19c5e..1b89f800f6dff 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -5064,6 +5064,7 @@ static const struct mtk_soc_data mt7988_data = {
 	.version = 3,
 	.offload_version = 2,
 	.hash_offset = 4,
+	.has_accounting = true,
 	.foe_entry_size = MTK_FOE_ENTRY_V3_SIZE,
 	.txrx = {
 		.txd_size = sizeof(struct mtk_tx_dma_v2),
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe.c b/drivers/net/ethernet/mediatek/mtk_ppe.c
index bf1ecb0c1c109..1ec508bb206bf 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe.c
+++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
@@ -107,10 +107,20 @@ static int mtk_mib_entry_read(struct mtk_ppe *ppe, u16 index, u64 *bytes, u64 *p
 	cnt_r1 = readl(ppe->base + MTK_PPE_MIB_SER_R1);
 	cnt_r2 = readl(ppe->base + MTK_PPE_MIB_SER_R2);
 
-	byte_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R0_BYTE_CNT_LOW, cnt_r0);
-	byte_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R1_BYTE_CNT_HIGH, cnt_r1);
-	pkt_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R1_PKT_CNT_LOW, cnt_r1);
-	pkt_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R2_PKT_CNT_HIGH, cnt_r2);
+	if (mtk_is_netsys_v3_or_greater(ppe->eth)) {
+		/* 64 bit for each counter */
+		bytes_cnt_low = cnt_r0;
+		bytes_cnt_high = cnt_r1;
+		pkt_cnt_low = cnt_r2;
+		pkt_cnt_high = readl(ppe->base + MTK_PPE_MIB_SER_R3);
+	} else {
+		/* 48 bit for each counter */
+		byte_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R0_BYTE_CNT_LOW, cnt_r0);
+		byte_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R1_BYTE_CNT_HIGH, cnt_r1);
+		pkt_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R1_PKT_CNT_LOW, cnt_r1);
+		pkt_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R2_PKT_CNT_HIGH, cnt_r2);
+	}
+
 	*bytes = ((u64)byte_cnt_high << 32) | byte_cnt_low;
 	*packets = (pkt_cnt_high << 16) | pkt_cnt_low;
 
diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
index a2e61b3eb006d..3ce088eef0efd 100644
--- a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
+++ b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
@@ -163,6 +163,8 @@ enum {
 #define MTK_PPE_MIB_SER_R2			0x348
 #define MTK_PPE_MIB_SER_R2_PKT_CNT_HIGH		GENMASK(23, 0)
 
+#define MTK_PPE_MIB_SER_R3			0x34c
+
 #define MTK_PPE_MIB_CACHE_CTL			0x350
 #define MTK_PPE_MIB_CACHE_CTL_EN		BIT(0)
 #define MTK_PPE_MIB_CACHE_CTL_FLUSH		BIT(2)
-- 
2.41.0