netdev - Re: 4.16 issue with mbim modem and ping with size

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Message-ID: <20180524155334.GA28874@kroah.com>
Date:   Thu, 24 May 2018 17:53:34 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Daniele Palmas <dnlplm@...il.com>
Cc:     netdev@...r.kernel.org, linux-usb <linux-usb@...r.kernel.org>
Subject: Re: 4.16 issue with mbim modem and ping with size > 14552 bytes

On Thu, May 24, 2018 at 05:04:49PM +0200, Daniele Palmas wrote:
> Hello,
> 
> I have an issue with an USB mbim modem when trying to send with ping
> more than 14552 bytes: it looks like to me a kernel issue, but not at
> the cdc_mbim or cdc_ncm level, anyway not sure, so I'm reporting the
> issue.
> 
> My kernel is 4.16. The device is the following:

Does older kernels work, or is this something that has always been
there?

I ask, as my mobile provider does horrible things to large packet sizes.
So much so that I have to set the mtu to 1280 just to get things to work
properly when tethering my phone through to my laptop.  So this might be
a network provider issue :)

thanks,

greg k-h