netdev - Re: [PATCH net-next v7 8/9] net: stmmac: dwmac-loongson: Disable flow control for GMAC

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Message-ID: <ex6xwrpnjbgq3vzvycyninsrdb2spc32t5aoiftnuq5aqkh4yx@fexrffrpec5l>
Date: Thu, 21 Dec 2023 05:35:41 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Yanteng Si <siyanteng@...ngson.cn>
Cc: andrew@...n.ch, hkallweit1@...il.com, peppe.cavallaro@...com, 
	alexandre.torgue@...s.st.com, joabreu@...opsys.com, Jose.Abreu@...opsys.com, 
	chenhuacai@...ngson.cn, linux@...linux.org.uk, guyinggang@...ngson.cn, 
	netdev@...r.kernel.org, chris.chenfeiyang@...il.com
Subject: Re: [PATCH net-next v7 8/9] net: stmmac: dwmac-loongson: Disable
 flow control for GMAC

On Tue, Dec 19, 2023 at 10:28:18PM +0800, Yanteng Si wrote:
> Loongson GMAC does not support Flow Control feature. Set flags to
> disable it.
> 
> Signed-off-by: Yanteng Si <siyanteng@...ngson.cn>
> Signed-off-by: Feiyang Chen <chenfeiyang@...ngson.cn>
> Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 2 ++
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c    | 6 +++---
>  include/linux/stmmac.h                               | 1 +
>  3 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> index 9e4953c7e4e0..77c9bcb66a8e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
> @@ -160,6 +160,8 @@ static int loongson_gmac_config(struct pci_dev *pdev,
>  		break;
>  	}
>  

> +	plat->flags |= FIELD_PREP(STMMAC_FLAG_DISABLE_FLOW_CONTROL, 1);

Why FIELD_PREP()-ing?

> +
>  	return ret;
>  }
>  
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 9764d2ab7e46..d94f61742772 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1236,9 +1236,9 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
>  		xpcs_get_interfaces(priv->hw->xpcs,
>  				    priv->phylink_config.supported_interfaces);
>  
> -	priv->phylink_config.mac_capabilities = MAC_ASYM_PAUSE | MAC_SYM_PAUSE |
> -						MAC_10FD | MAC_100FD |
> -						MAC_1000FD;
> +	priv->phylink_config.mac_capabilities = MAC_10FD | MAC_100FD | MAC_1000FD;

> +	if (!FIELD_GET(STMMAC_FLAG_DISABLE_FLOW_CONTROL, priv->plat->flags))

!(priv->plat->flags & STMMAC_FLAG_DISABLE_FLOW_CONTROL) ?

-Serge(y)

> +		priv->phylink_config.mac_capabilities |= MAC_ASYM_PAUSE | MAC_SYM_PAUSE;
>  
>  	stmmac_set_half_duplex(priv);
>  
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index 067030cdb60f..5ece92e4d8c3 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -224,6 +224,7 @@ struct dwmac4_addrs {
>  #define STMMAC_FLAG_HAS_LGMAC			BIT(13)
>  #define STMMAC_FLAG_DISABLE_HALF_DUPLEX	BIT(14)
>  #define STMMAC_FLAG_DISABLE_FORCE_1000	BIT(15)
> +#define STMMAC_FLAG_DISABLE_FLOW_CONTROL	BIT(16)
>  
>  struct plat_stmmacenet_data {
>  	int bus_id;
> -- 
> 2.31.4
>