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Date:   Mon, 31 Jan 2022 10:40:38 -0800
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Subject: Re: [PATCH net-next] net: kbuild: Don't default net vendor configs to
 y
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To:     Saeed Mahameed <saeedm@nvidia.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Stephen Hemminger <stephen@networkplumber.org>,
        Saeed Mahameed <saeed@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Mark Einon <mark.einon@gmail.com>,
        Lino Sanfilippo <LinoSanfilippo@gmx.de>,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Shay Agroskin <shayagr@amazon.com>,
        Arthur Kiyanovski <akiyano@amazon.com>,
        David Arinzon <darinzon@amazon.com>,
        Noam Dagan <ndagan@amazon.com>,
        Saeed Bishara <saeedb@amazon.com>,
        Chris Snook <chris.snook@gmail.com>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Claudiu Beznea <claudiu.beznea@microchip.com>,
        Hans Ulli Kroll <ulli.kroll@googlemail.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Jeroen de Borst <jeroendb@google.com>,
        Catherine Sullivan <csully@google.com>,
        David Awogbemila <awogbemila@google.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        "K . Y . Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Claudiu Manoil <claudiu.manoil@nxp.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
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        Jon Mason <jdmason@kudzu.us>,
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        Zhu Yanjun <zyjzyj2000@gmail.com>,
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        Jiri Pirko <jiri@resnulli.us>,
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        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
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        Arnd Bergmann <arnd@arndb.de>,
        Jacob Keller <jacob.e.keller@intel.com>,
        Vegard Nossum <vegard.nossum@oracle.com>,
        Rob Herring <robh@kernel.org>, l.stelmach@samsung.com,
        rafal@milecki.pl, Edwin Peer <edwin.peer@broadcom.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
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        Gerhard Engleder <gerhard@engleder-embedded.com>,
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        Oleksij Rempel <linux@rempel-privat.de>,
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        Joel Stanley <joel@jms.id.au>, Slark Xiao <slark_xiao@163.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Liming Sun <limings@nvidia.com>,
        David Thompson <davthompson@nvidia.com>,
        Asmaa Mnebhi <asmaa@nvidia.com>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        Horatiu Vultur <horatiu.vultur@microchip.com>,
        Steen Hegelund <steen.hegelund@microchip.com>,
        Prabhakar Kushwaha <pkushwaha@marvell.com>,
        Omkar Kulkarni <okulkarni@marvell.com>,
        Shai Malin <smalin@marvell.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Stefan Wahren <stefan.wahren@i2se.com>,
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References: <20220131172450.4905-1-saeed@kernel.org>
 <20220131095905.08722670@hermes.local>
 <CAMuHMdU17cBzivFm9q-VwF9EG5MX75Qct=is=F2h+Kc+VddZ4g@mail.gmail.com>
 <20220131183540.6ekn3z7tudy5ocdl@sx1>
From:   Florian Fainelli <f.fainelli@gmail.com>
In-Reply-To: <20220131183540.6ekn3z7tudy5ocdl@sx1>
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On 1/31/2022 10:35 AM, Saeed Mahameed wrote:
> On 31 Jan 19:30, Geert Uytterhoeven wrote:
>> On Mon, Jan 31, 2022 at 6:59 PM Stephen Hemminger
>> <stephen@networkplumber.org> wrote:
>>> On Mon, 31 Jan 2022 09:24:50 -0800
>>> Saeed Mahameed <saeed@kernel.org> wrote:
>>>
>>> > From: Saeed Mahameed <saeedm@nvidia.com>
>>> >
>>> > NET_VENDOR_XYZ were defaulted to 'y' for no technical reason.
>>> >
>>> > Since all drivers belonging to a vendor are supposed to default to 
>>> 'n',
>>> > defaulting all vendors to 'n' shouldn't be an issue, and aligns well
>>> > with the 'no new drivers' by default mentality.
>>> >
>>> > Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
>>>
>>> This was done back when vendors were introduced in the network 
>>> drivers tree.
>>> The default of Y allowed older configurations to just work.
>>
>> And changing the defaults means all defconfigs must be updated first,
>> else the user's configs will end up without drivers needed.
>>
> 
> As I understand correctly, at least for most common net drivers, having 
> NET_VENDOR_XYZ=y doesn't actually build anything, we have flags per
> module for each vendor and those are defaulted to N.

Right, but once you start hiding NET_VENDOR_DRIVER_XYZ under a 
NET_VENDOR_XYZ Kconfig symbol dependency, if NET_VENDOR_XYZ is not set 
to Y, then you have no way to select NET_VENDOR_DRIVER_XYZ and so your 
old defconfig breaks.

> 
>>> So there was a reason, not sure if it matters anymore.
>>> But it seems like useless repainting to change it now.
>>
>> It might make sense to tune some of the defaults (i.e. change to
>> "default y if ARCH_*") for drivers with clear platform dependencies.
>>
> 
> either set hard default to 'n' or just keep it as is, anything else is just
> more confusion.

Maybe the rule should go like this: any new driver vendor defaults to n, 
and existing ones remain set to y, until we deprecate doing that and 
switching them all off to n by 5.18?
-- 
Florian