netdev - Re: [Enable Designware XGMAC VLAN Stripping Feature 2/2] net: stmmac: dwxgmac2: Add support for HW-accelerated VLAN Stripping

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Message-ID: <68485bf5-0550-4954-cbaa-7f6a5443e4aa@kernel.org>
Date: Fri, 21 Jul 2023 18:22:50 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Florian Fainelli <f.fainelli@...il.com>,
 "Ng, Boon Khai" <boon.khai.ng@...el.com>,
 "Boon@...mtp.png.intel.com" <Boon@...mtp.png.intel.com>,
 "Khai@...mtp.png.intel.com" <Khai@...mtp.png.intel.com>,
 Giuseppe Cavallaro <peppe.cavallaro@...com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>, "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, "netdev@...r.kernel.org"
 <netdev@...r.kernel.org>,
 "linux-stm32@...md-mailman.stormreply.com"
 <linux-stm32@...md-mailman.stormreply.com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: "Shevchenko, Andriy" <andriy.shevchenko@...el.com>,
 "Tham, Mun Yew" <mun.yew.tham@...el.com>,
 "Swee, Leong Ching" <leong.ching.swee@...el.com>,
 "G Thomas, Rohan" <rohan.g.thomas@...el.com>,
 Shevchenko Andriy <andriy.shevchenko@...ux.intel.com>
Subject: Re: [Enable Designware XGMAC VLAN Stripping Feature 2/2] net: stmmac:
 dwxgmac2: Add support for HW-accelerated VLAN Stripping

On 21/07/2023 17:59, Florian Fainelli wrote:
>>>> +	/* Rx VLAN HW Stripping */
>>>> +	if (of_property_read_bool(np, "snps,rx-vlan-offload")) {
>>>> +		dev_info(&pdev->dev, "RX VLAN HW Stripping\n");
>>>
>>> Why? Drop.
>>>
>>
>> This is an dts option export to dts for user to choose whether or not they
>> Want a Hardware stripping or a software stripping.
>>
>> May I know what is the reason to drop this?
> 
> Because the networking stack already exposes knobs for drivers to 
> advertise and control VLAN stripping/insertion on RX/TX using ethtool 
> and feature bits (NETIF_F_HW_VLAN_CTAG_RX, NETIF_F_HW_VLAN_CTAG_TX).
> 
> What you are doing here is encode a policy as a Device Tree property 
> rather than describe whether the hardware supports a given feature and 
> this is frowned upon.

That's even better reason...

Best regards,
Krzysztof