linux-kernel - Re: [PATCH net-next 1/3] net: stmmac: Add generic suspend/resume helper for PCI-based controllers

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Message-ID: <58de2a18-94da-4018-95f6-2fa4242e231d@linux.dev>
Date: Wed, 29 Oct 2025 17:07:04 +0800
From: Yanteng Si <si.yanteng@...ux.dev>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Yao Zi <ziyao@...root.org>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Huacai Chen <chenhuacai@...nel.org>, Philipp Stanner <phasta@...nel.org>,
 Tiezhu Yang <yangtiezhu@...ngson.cn>, Qunqin Zhao <zhaoqunqin@...ngson.cn>,
 Vladimir Oltean <vladimir.oltean@....com>, Furong Xu <0x1207@...il.com>,
 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
 Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] net: stmmac: Add generic suspend/resume
 helper for PCI-based controllers

在 2025/10/29 下午5:00, Russell King (Oracle) 写道:
> On Wed, Oct 29, 2025 at 10:27:18AM +0800, Yanteng Si wrote:
>> 在 2025/10/28 下午11:59, Russell King (Oracle) 写道:
>>> On Tue, Oct 28, 2025 at 03:43:30PM +0000, Yao Zi wrote:
>>>> Most glue driver for PCI-based DWMAC controllers utilize similar
>>>> platform suspend/resume routines. Add a generic implementation to reduce
>>>> duplicated code.
>>>>
>>>> Signed-off-by: Yao Zi<ziyao@...root.org>
>>>> ---
>>>>    drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  2 +
>>>>    .../net/ethernet/stmicro/stmmac/stmmac_main.c | 37 +++++++++++++++++++
>>> I would prefer not to make stmmac_main.c even larger by including bus
>>> specific helpers there. We already have stmmac_pltfm.c for those which
>>> use struct platform_device. The logical name would be stmmac_pci.c, but
>>> that's already taken by a driver.
>>>
>>> One way around that would be to rename stmmac_pci.c to dwmac-pci.c
>>> (glue drivers tend to be named dwmac-foo.c) and then re-use
>>> stmmac_pci.c for PCI-related stuff in the same way that stmmac_pltfm.c
>>> is used.
>>>
>>> Another idea would be stmmac_libpci.c.
>> I also don't want stmmac_main.c to grow larger, and I prefer
>> stmmac_libpci.c instead. Another approach - maybe we can
>> keep these helper functions in stmmac_pci.c and just declare
>> them as extern where needed?
> stmmac_pci.c is itself a glue driver, supporting PCI IDs:
>
> 	0x0700, 0x1108	- synthetic ID
> 	0x104a, 0xcc09	- ST Micro MAC
> 	0x16c3, 0x7102	- Synopsys GMAC5
>
> I don't think we should try to turn a glue driver into a library,
> even though it would be the easier option (we could reuse
> CONFIG_STMMAC_PCI.)

I agree with your opinion; let's build a new library.

Thanks,

Yanteng