Subject: Re: [PATCH net-next v3] net: ethernet: mtk_eth_soc: support per-flow accounting on MT7988

From: Simon Horman <[email-masked]>
Date: Wed, 2 Aug 2023 17:40:16 +0200

+ Larysa Zaremba

On Wed, Aug 02, 2023 at 04:31:09AM +0100, Daniel Golle wrote:
> NETSYS_V3 uses 64 bits for each counters while older SoCs are using
> 48/40 bits for each counter.
> Support reading per-flow byte and package counters on NETSYS_V3.
> 
> Signed-off-by: Daniel Golle <[email-masked]>

Hi Daniel,

I think you missed Larysa's Reviewed-by tag from v2.

In any case, this looks good to me.

Reviewed-by: Simon Horman <[email-masked]>

> ---
> v3: correct calculation, local variables
> v2: fix typo bytes_cnt_* -> byte_cnt_*
> 
> drivers/net/ethernet/mediatek/mtk_eth_soc.c  |  1 +
>  drivers/net/ethernet/mediatek/mtk_ppe.c      | 21 +++++++++++++-------
>  drivers/net/ethernet/mediatek/mtk_ppe_regs.h |  2 ++
>  3 files changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 05be702f19c5..1b89f800f6df 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 bf1ecb0c1c10..973370c3cb51 100644
> --- a/drivers/net/ethernet/mediatek/mtk_ppe.c
> +++ b/drivers/net/ethernet/mediatek/mtk_ppe.c
> @@ -92,7 +92,6 @@ static int mtk_ppe_mib_wait_busy(struct mtk_ppe *ppe)
>  
>  static int mtk_mib_entry_read(struct mtk_ppe *ppe, u16 index, u64 *bytes, u64 *packets)
>  {
> -	u32 byte_cnt_low, byte_cnt_high, pkt_cnt_low, pkt_cnt_high;
>  	u32 val, cnt_r0, cnt_r1, cnt_r2;
>  	int ret;
>  
> @@ -107,12 +106,20 @@ 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);
> -	*bytes = ((u64)byte_cnt_high << 32) | byte_cnt_low;
> -	*packets = (pkt_cnt_high << 16) | pkt_cnt_low;
> +	if (mtk_is_netsys_v3_or_greater(ppe->eth)) {
> +		/* 64 bit for each counter */
> +		u32 cnt_r3 = readl(ppe->base + MTK_PPE_MIB_SER_R3);
> +		*bytes = ((u64)cnt_r1 << 32) | cnt_r0;
> +		*packets = ((u64)cnt_r3 << 32) | cnt_r2;
> +	} else {
> +		/* 48 bit byte counter, 40 bit packet counter */
> +		u32 byte_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R0_BYTE_CNT_LOW, cnt_r0);
> +		u32 byte_cnt_high = FIELD_GET(MTK_PPE_MIB_SER_R1_BYTE_CNT_HIGH, cnt_r1);
> +		u32 pkt_cnt_low = FIELD_GET(MTK_PPE_MIB_SER_R1_PKT_CNT_LOW, cnt_r1);
> +		u32 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 = ((u64)pkt_cnt_high << 16) | pkt_cnt_low;
> +	}
>  
>  	return 0;
>  }
> diff --git a/drivers/net/ethernet/mediatek/mtk_ppe_regs.h b/drivers/net/ethernet/mediatek/mtk_ppe_regs.h
> index a2e61b3eb006..3ce088eef0ef 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
> 
>