netdev - Re: [PATCH net-next v8 10/11] net: stmmac: dwmac-loongson: Disable flow control for GMAC

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Date: Wed, 13 Mar 2024 17:25:34 +0800
From: Yanteng Si <siyanteng@...ngson.cn>
To: Serge Semin <fancer.lancer@...il.com>
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 v8 10/11] net: stmmac: dwmac-loongson: Disable
 flow control for GMAC


在 2024/2/6 06:13, Serge Semin 写道:
> On Tue, Jan 30, 2024 at 04:49:15PM +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 | 1 +
>>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c    | 6 +++---
>>   include/linux/stmmac.h                               | 1 +
>>   3 files changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
>> index 1753a3c46b77..b78a73ea748b 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
>> @@ -335,6 +335,7 @@ static int loongson_gmac_config(struct pci_dev *pdev,
>>   				struct stmmac_resources *res,
>>   				struct device_node *np)
>>   {
>> +	plat->flags |= STMMAC_FLAG_DISABLE_FLOW_CONTROL;
>>   
>>   	return 0;
>>   }
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 3aa862269eb0..8d676cbfba1e 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -1237,9 +1237,9 @@ 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 (!(priv->plat->flags & STMMAC_FLAG_DISABLE_FLOW_CONTROL))
>> +		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 197f6f914104..832cd8cd688f 100644
>> --- a/include/linux/stmmac.h
>> +++ b/include/linux/stmmac.h
>> @@ -223,6 +223,7 @@ struct dwmac4_addrs {
>>   #define STMMAC_FLAG_HWTSTAMP_CORRECT_LATENCY	BIT(12)
>>   #define STMMAC_FLAG_DISABLE_FORCE_1000	BIT(13)
>>   #define STMMAC_FLAG_DISABLE_HALF_DUPLEX	BIT(14)
>> +#define STMMAC_FLAG_DISABLE_FLOW_CONTROL	BIT(15)
> See my last comment in patch 9/11. This can be reached by re-defining
> the stmmac_ops::phylink_get_caps() callback.

OK.


Thanks,

Yanteng

>
> -Serge(y)
>
>>   
>>   struct plat_stmmacenet_data {
>>   	int bus_id;
>> -- 
>> 2.31.4
>>