[PATCH 3/6] net: make NET a menuconfig (and downgrade NO_NET to a simple config)

[Simon Glass]

On 2026-04-20T11:36:06, Quentin Schulz <foss+uboot at 0leil.net> wrote:
> net: make NET a menuconfig (and downgrade NO_NET to a simple config)
>
> This will allow a bunch of simplifications across the code base.
> Disabling NET is the equivalent of today's NO_NET choice. This means
> that if NET is enabled, either the legacy or lwIP stack is necessarily
> selected, which allows us to simplify if NET_LEGACY || NET_LWIP into
> if NET in a later commit.
>
> Config fragments - or defconfigs including other defconfigs - setting
> the network stack (NET_LEGACY or NET_LWIP) must also set NET (or unset
> NO_NET) if the config they apply to - or the included defconfigs -
> unsets NET (or selects NO_NET) as otherwise the NET_LEGACY and NET_LWIP
> symbols are unreachable. This is the case for the two defconfig modified
> in this commit.
>
> NO_NET is now a convenience symbol which hides NET entirely to avoid
> modifying many defconfigs. If one selected NO_NET to disable the
> networking stack in the past, this will still work for now. Technically,
> we should be using the 'transitional' Kconfig attribute but that is only
> available since Kconfig from Linux kernel v6.18 and we're on 6.1 right
> now.
>
> Note that this moves CONFIG_SYS_RX_ETH_BUFFER from under the Network
> menu back into the main menu as it seems like it needs to be defined
> even when there's no need for NET support at all and menuconfig option
> doesn't work the same way as a menu.
>
> Signed-off-by: Quentin Schulz <quentin.schulz at cherry.de>
>
> configs/am62px_evm_r5_ethboot_defconfig |  2 +-
>  configs/j722s_evm_r5_ethboot_defconfig  |  2 +-
>  net/Kconfig                             | 23 ++++++++++++-----------
>  3 files changed, 14 insertions(+), 13 deletions(-)

Reviewed-by: Simon Glass <sjg at chromium.org>