Date:   Tue, 1 Feb 2022 21:16:09 -0800
From:   Saeed Mahameed <saeedm@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
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Subject: Re: [PATCH net-next] net: kbuild: Don't default net vendor configs
 to y

On 01 Feb 20:58, Jakub Kicinski wrote:
>On Tue, 1 Feb 2022 20:46:03 -0800 Saeed Mahameed wrote:
>> I am getting mixed messages here, on one hand we know that this patch
>> might break some old or def configs, but on the other hand people claim
>> that they have to manually fixup their own configs every time
>> "something in configs" changes and they are fine with that.
>>
>> Obviously I belong to the 2nd camp, hence this patch..
>>
>> I can sum it up with "it's fine to controllably break *some* .configs for
>> the greater good" .. that's my .2cent.
>
>I think we agree that we don't care about oldconfigs IOW someone's
>random config.
>
>But we do care about defconfigs in the tree, if those indeed include
>ethernet drivers which would get masked out by vendor=n - they need
>fixin':
>
>$ find arch/ | grep defconfig
>arch/x86/configs/i386_defconfig
>arch/x86/configs/x86_64_defconfig
>arch/ia64/configs/generic_defconfig
>arch/ia64/configs/gensparse_defconfig
>...
>
>First one from the top:
>
>$ make O=build_tmp/ i386_defconfig
>$ $EDITOR drivers/net/ethernet/intel/Kconfig
>$ git diff
>diff --git a/drivers/net/ethernet/intel/Kconfig b/drivers/net/ethernet/intel/Kconfig
>index 3facb55b7161..b9fdf2a835b0 100644
>--- a/drivers/net/ethernet/intel/Kconfig
>+++ b/drivers/net/ethernet/intel/Kconfig
>@@ -5,7 +5,6 @@
>
> config NET_VENDOR_INTEL
>        bool "Intel devices"
>-       default y
>        help
>          If you have a network (Ethernet) card belonging to this class, say Y.
>
>$ make O=build_tmp/ i386_defconfig
>$ diff -urpb build_tmp/.config.old build_tmp/.config
>--- build_tmp/.config.old	2022-02-01 20:55:37.087373905 -0800
>+++ build_tmp/.config	2022-02-01 20:56:32.126044628 -0800
>@@ -1784,22 +1784,7 @@ CONFIG_NET_VENDOR_GOOGLE=y
> # CONFIG_GVE is not set
> CONFIG_NET_VENDOR_HUAWEI=y
> # CONFIG_HINIC is not set
>-CONFIG_NET_VENDOR_I825XX=y
>-CONFIG_NET_VENDOR_INTEL=y
>-CONFIG_E100=y
>-CONFIG_E1000=y
>-CONFIG_E1000E=y
>-CONFIG_E1000E_HWTS=y
>-# CONFIG_IGB is not set
>-# CONFIG_IGBVF is not set
>-# CONFIG_IXGB is not set
>-# CONFIG_IXGBE is not set
>-# CONFIG_IXGBEVF is not set
>-# CONFIG_I40E is not set
>-# CONFIG_I40EVF is not set
>-# CONFIG_ICE is not set
>-# CONFIG_FM10K is not set
>-# CONFIG_IGC is not set
>+# CONFIG_NET_VENDOR_INTEL is not set

We can introduce CONFIG_NET_LEGACY_VENDOR that selects all current vendors.
it will be off by default but will be added where needed in the defconfigs 

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