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  • Lenovo RTL8153-04 jumbo frames on ARM

    From Lionel =?iso-8859-1?Q?=C9lie?= Mama@21:1/5 to All on Mon Nov 11 05:30:01 2024
    Hi,

    After much head-scratching of why I could not SSH-connect to the
    computer in my basement (the SSH connection process would start but
    then stall), while everything seemed normal on the physical console, I understood that the USB-C Ethernet NIC that came with my Lenovo X13s
    seems not to work with jumbo frames.

    I dusted off my old am64 laptop, connected the same USB-C Ethernet NIC
    and there with kernel 5.10.0-21-amd64, it works with 9000 bytes Jumbo
    Frames via a USB-C to USB-A adapter, no trouble. Same when connected
    to a ppc64le machine running 6.10.11+bpo-powerpc64le-64k over the same
    USB-C to USB-A adapter.

    So it seem to be aarch64-specific :-/ Anybody knows whether this a
    general problem for this chipset and/or ethernet in general on
    aarch64? Is it worth picking up another USB-C NIC and trying?

    Since Debian kernels don't work on the ThinkPad X13s yet, I run a
    6.6.12 kernel compiled from https://github.com/steev/linux.git branch lenovo-x13s-linux-6.6.y as of 2024-01-19 (date of last commit). Just
    haven't upgraded since. Could be an error I made in the kernel's
    config, but I cannot imagine what? On the aarch64 laptop, "ip link
    show" lists an MTU of 9000, so the kernel thinks it set it correctly.

    Theoretically it could also be USB-C specific, but that seems rather
    unlikely?

    Thanks in advance for any idea or hint,

    --
    Lionel

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  • From Emanuele Rocca@21:1/5 to All on Mon Nov 11 12:00:02 2024
    Hi Lionel,

    On 2024-11-11 04:53, Lionel �lie Mamane wrote:
    Since Debian kernels don't work on the ThinkPad X13s yet, I run a
    6.6.12 kernel compiled from https://github.com/steev/linux.git branch lenovo-x13s-linux-6.6.y as of 2024-01-19 (date of last commit).

    All X13s users I know run Trixie (testing) instead of Bookworm. The main
    reason for this is that indeed as you said Bookworm kernels (6.1.x)
    don't have X13s support.

    However, if you want to run Bookworm I would suggest trying the kernels
    from backports (6.10.x):
    https://backports.debian.org/Instructions/

    If you do give it a shot, please let us know whether that fixes the
    problem you've seen with jumbo frames.

    More general information about Debian on the X13s here: https://wiki.debian.org/InstallingDebianOn/Thinkpad/X13s

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  • From Lionel =?iso-8859-1?Q?=C9lie?= Mama@21:1/5 to Emanuele Rocca on Wed Nov 13 05:10:01 2024
    On Mon, Nov 11, 2024 at 10:50:45AM +0000, Emanuele Rocca wrote:
    On 2024-11-11 04:53, Lionel �lie Mamane wrote:

    Since Debian kernels don't work on the ThinkPad X13s yet, I run a
    6.6.12 kernel compiled from https://github.com/steev/linux.git
    branch lenovo-x13s-linux-6.6.y as of 2024-01-19 (date of last
    commit).

    All X13s users I know run Trixie (testing) instead of Bookworm. The
    main reason for this is that indeed as you said Bookworm kernels
    (6.1.x) don't have X13s support.

    More general information about Debian on the X13s here: https://wiki.debian.org/InstallingDebianOn/Thinkpad/X13s

    I wasn't aware pristine Debian trixie/sid kernels had x13s support
    now. I never got them to boot; I tried the latest sid one every few
    months, but I never had any luck.

    I reviewed the current version of the wiki page; I did the things that
    looked relevant:

    * hardcoding the module list in /etc/initramfs-tools/modules

    * adding "arm64.nopauth" to the linux parameters; I also removed
    "clk_ignore_unused" which my self-compiled 6.6.12 required, but
    apparently Debian 6.11.7-1 does not.

    Booting into Linux kernel 6.11.7-1 fixed the jumbo frame issue. Thanks
    very much!!!

    I used to install the dtb files as /boot/efi/dtb/f249803d-0d95-54f3-a28f-f2614a03f3b.dtb
    the wiki page says to install them as /boot/efi/sc8280xp-lenovo-thinkpad-x13s.dtb

    I have two EFI boot entries; one is called "debian" and probably was
    created automatically by something? It boots into
    HD(1,GPT,${LONG UUID},0x800,0x100000)/File(\EFI\debian\grubaa64.efi)
    the other is clearly created manually by me (must be following the
    instructions on [1]) and boots into
    VenHw(${ANOTHER LONG UUID})/PcieRoot(0x2)/Pci(0x0,0x0)/NVMe(0x1,00-25-38-EC-21-B9-CC-B1)/HD(1,GPT,${LONG UUID},0x800,0x100000)/File(\EFI\debian\DtbLoaeder.efi)

    I guess that these two different boot loaders methods are what makes
    the difference as to where the .dtb file is loaded from?

    [1] https://docs.google.com/document/d/1WuxE-42ZeOkKAft5FuUk6C2fonkQ8sqNZ56ZmZ49hGI
    Linaro -- Instructions for flashing and installing the Debian installer

    --
    Lionel

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