linux-kernel - Re: [PATCH net-next 3/4] net-next: ethernet: mediatek: add CDM able to recognize the tag for DSA

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Message-ID: <6f85f6ee-6ded-9bda-a4aa-4bbf9c892848@gmail.com>
Date:   Mon, 13 Mar 2017 09:39:22 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     sean.wang@...iatek.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, matthias.bgg@...il.com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        davem@...emloft.net, Landen.Chao@...iatek.com, keyhaede@...il.com,
        objelf@...il.com
Subject: Re: [PATCH net-next 3/4] net-next: ethernet: mediatek: add CDM able
 to recognize the tag for DSA

On 03/13/2017 09:11 AM, sean.wang@...iatek.com wrote:
> From: Sean Wang <sean.wang@...iatek.com>
> 
> Allowing CDM can recognize these packets with carrying port-distinguishing
> tag when CONFIG_NET_DSA_TAG_MTK is enabled. Otherwise, these packets will
> be dropped by CDM ingress.
> 
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> Signed-off-by: Landen Chao <Landen.Chao@...iatek.com>
> ---
>  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 8 ++++++++
>  drivers/net/ethernet/mediatek/mtk_eth_soc.h | 5 +++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> index 3dd8788..19944e0 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
> @@ -1848,6 +1848,14 @@ static int mtk_hw_init(struct mtk_eth *eth)
>  	/* GE2, Force 1000M/FD, FC ON */
>  	mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
>  
> +#if defined(CONFIG_NET_DSA_TAG_MTK)
> +	/* Tell CDMQ to parse the MTK special tag from CPU  */
> +	/* QDMA Tx Use CDMQ */
> +	u32 val2 = mtk_r32(eth, MTK_CDMQ_IG_CTRL);
> +
> +	mtk_w32(eth, val2 | MTK_CDMQ_STAG_EN, MTK_CDMQ_IG_CTRL);
> +#endif
> +

Depending on how early you call this function, can you use
netdev_uses_dsa() instead of this? You may want to consider using #if
IS_ENABLED() to cover the modular case as well.

>  	/* Enable RX VLan Offloading */
>  	mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);
>  
> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> index 99b1c8e..79606db 100644
> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
> @@ -70,11 +70,16 @@
>  /* Frame Engine Interrupt Grouping Register */
>  #define MTK_FE_INT_GRP		0x20
>  
> +/* CDMP Ingress Control Register */
> +#define MTK_CDMQ_IG_CTRL	0x1400
> +#define MTK_CDMQ_STAG_EN	BIT(0)
> +
>  /* CDMP Exgress Control Register */
>  #define MTK_CDMP_EG_CTRL	0x404
>  
>  /* GDM Exgress Control Register */
>  #define MTK_GDMA_FWD_CFG(x)	(0x500 + (x * 0x1000))
> +#define MTK_GDMA_STAG_EN	BIT(24)
>  #define MTK_GDMA_ICS_EN		BIT(22)
>  #define MTK_GDMA_TCS_EN		BIT(21)
>  #define MTK_GDMA_UCS_EN		BIT(20)
> 


-- 
Florian