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SubjectRE: [PATCH] usbnet: ipheth: fix connectivity with iOS 14
Sorry I didn't have time to research this further to prove it was a regression - but there is now somebody else who has done so and created a patch.  I thought it might be good to give a link to it to you guys.  It caused problems on all iOS versions AFAIK.  The patch and discussion is available at:


-----Original Message-----
From: Oliver Neukum <>
Sent: Monday, February 22, 2021 2:10 AM
To: Sam Bingner <>;
Cc: David S. Miller <>; Martin Habets <>; Luc Van Oostenryck <>; Shannon Nelson <>; Michael S. Tsirkin <>;;; Matti Vuorela <>; Jakub Kicinski <>; Yves-Alexis Perez <>
Subject: Re: [PATCH] usbnet: ipheth: fix connectivity with iOS 14

Am Sonntag, den 21.02.2021, 10:42 +0000 schrieb Sam Bingner:
> There seems to be a problem with this patch:
> Whenever the iPhone sends a packet to the tethered device that is 1500 bytes long, it gets the error "ipheth 1-1:4.2: ipheth_rcvbulk_callback: urb status: -79" on the connected device and stops passing traffic. I am able to bring it back up by shutting and unshutting the interface, but the same thing happens very quickly. I noticed that this patch dropped the max USB packet size from 1516 to 1514 bytes, so I decided to try lowering the MTU to 1498; this made the connection reliable and no more errors occurred.
> It appears to me that the iPhone is still sending out 1516 bytes over USB for a 1500 byte packet and this patch makes USB abort when that happens? I could duplicate reliably by sending a ping from the iphone (ping -s 1472) to the connected device, or vice versa as the reply would then break it.
> I apologize if this reply doesn't end up where it should - I tried to reply to the last message in this thread but I wasn't actually *on* the thread so I had to just build it as much as possible myself.

Is this a regression? Does it work after reverting the patch? Which version of iOS?


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