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--- Begin Message ---
Hello Jaap,

On Thu, May 24, 2018 at 12:00 PM, Jaap Buurman <[email protected]> wrote:
> Dear all,
>
> I found some additional information in the system log: Thu May 24
> 11:38:39 2018 kern.err kernel: [83864.729458] eth0: Invalid MTU 1508
> requested, hw max 1500
> Digging deeper, this seems like a message that is spawned by a
> function in /net/core.dev.c of the linux kernel:
>
> if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) {
> net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n",
> dev->name, new_mtu, dev->max_mtu);
> return -EINVAL;
> }
>
> Is there anybody that happens to know where exactly this max_mtu value
> is set to 1500? For mt7621 devices this should be 2048 (Baby jambo
> frames).
>
> Thank you very much in advance.
>
> Yours sincerely,
>
> Jaap Buurman
>
> On Tue, May 22, 2018 at 3:05 PM, Jaap Buurman <[email protected]> wrote:
>> Dear all,
>>
>> The switch to the 4.14 kernel apparently broke the baby jumbo frames
>> support of 2048 bytes that the switch is capable off. I found out that
>> changing the mtu above 1500 via Luci no longer applies properly.
>> Trying to manually change the mtu via ssh also fails:
>>
>> root@LEDE:~# ifconfig eth0 mtu 1508 up
>> ifconfig: SIOCSIFMTU: Invalid argument
>>
>> If there is any additional information that I can supply, please let
>> me know. I am also more than willing to help test potential fixes :)
I *believe* Mathias has a fix for this in his tree (but I'm not sure
if he has the hardware to test it): [0]
maybe you can give it a go and report back?


Regards
Martin


[0] 
https://git.openwrt.org/?p=openwrt/staging/mkresin.git;a=commitdiff;h=cc5f1fe7aa02943f3b39ffbd9dc3b8fcad569c8f


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