linux-kernel - Re: [Enable Designware XGMAC VLAN Stripping Feature v2 1/1] net: stmmac: dwxgmac2: Add support for HW-accelerated VLAN Stripping

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Date: Tue, 4 Jun 2024 21:26:37 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Ng, Boon Khai" <boon.khai.ng@...el.com>
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.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>,
	"Ang, Tien Sung" <tien.sung.ang@...el.com>,
	"G Thomas, Rohan" <rohan.g.thomas@...el.com>,
	"Looi, Hong Aun" <hong.aun.looi@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"Tham, Mun Yew" <mun.yew.tham@...el.com>
Subject: Re: [Enable Designware XGMAC VLAN Stripping Feature v2 1/1] net:
 stmmac: dwxgmac2: Add support for HW-accelerated VLAN Stripping

On Tue, Jun 04, 2024 at 06:05:35AM +0000, Ng, Boon Khai wrote:
>  
> > You should generalize the existing functions into some other file within
> > stmmac/ folder and call those functions from both dwmac4_core and
> > dwxgmac2_core.
> > Do the rework of existing function & callers first and add the new bits in
> > another patch in the patch series.
> >
> 
> Hi Ilpo, do you mean I should create a new file for example,
> stammc_vlan.c,  and move the common vlan function inside?
> so that it can be called either from dwmac4_core, dwxgmac2_core 
> or stmmac_main.c? or maybe I should just consolidate them into
> stmmac_main.c?

Do you have access to all the reference documentation for the IP
driven in dwmac4_core.c, dwxgmac2_core.c and stmmac_main.c? Is it just
VLAN which is the same, and everything else is different? Or are other
blocks of the hardware also identical and the code should be shared?
If VLAN is all that is identical, then stammc_vlan.c would make sense.

If there is more in common, you can start the cleanup of the mess this
driver is by moving the VLAN code into a shared file, but make the
naming of that file more generic so more shared code can be added with
later cleanups.

       Andrew