[PATCH v5 00/20] Introduce the lwIP network stack

[Tom Rini]

On Thu, Jul 25, 2024 at 02:57:21PM +0200, Jerome Forissier wrote:

> This is a rework of a patch series by Maxim Uvarov: "net/lwip: add lwip
> library for the network stack" [1]. The goal is to introduce the lwIP TCP/IP
> stack [2] [3] as an alternative to the current implementation in net/,
> selectable with Kconfig, and ultimately keep only lwIP if possible. Some
> reasons for doing so are:
> - Make the support of HTTPS in the wget command easier. Javier T. and
> Raymond M. (CC'd) have some additional lwIP and Mbed TLS patches to do
> so. With that it becomes possible to fetch and launch a distro installer
> such as Debian etc. using a secure, authenticated connection directly
> from the U-Boot shell. Several use cases:
>   * Authentication: prevent MITM attack (third party replacing the
> binary with a different one)
>   * Confidentiality: prevent third parties from grabbing a copy of the
> image as it is being downloaded
>   * Allow connection to servers that do not support plain HTTP anymore
> (this is becoming more and more common on the Internet these days)
> - Possibly benefit from additional features implemented in lwIP
> - Less code to maintain in U-Boot
> 
> Prior to applying this series, the lwIP stack needs to be added as a
> Git subtree with the following command:
> 
>  $  git subtree add --squash --prefix lib/lwip/lwip https://git.savannah.gnu.org/git/lwip.git STABLE-2_2_0_RELEASE

This is better than v4, and on the hardware platforms I could build and
boot on (which was most of mine except the am62x_beagleplay), the tests
ran and completed, including the tftp+boot a Linux kernel.

The bad news is CI blows up, a lot:
https://source.denx.de/u-boot/u-boot/-/pipelines/21764
And:
https://dev.azure.com/u-boot/a1096300-2999-4ec4-a21a-4c22075e3771/_apis/build/builds/9014/logs/106
which is another Kconfig dependency problem. I don't _think_ I
introduced that, but since this wasn't against top of tree, I had to
apply the cmd/Kconfig patch manually.

I have my world build running still and may have more comments based on
that.

-- 
Tom
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