Re: rx errors reported by usbnet

On Thu, 17 May 2007, Yum Rayan wrote:

> Hi,
> 
> I have a bunch of USB devices configured for ethernet over USB
> connected to my machine. The host is running a 2.6.16 based kernel and
> I notice that rx errors reported via /proc/net/dev keep increasing
> infinitely. Initially the device responds without any problems, but at
> some random time, eventually the device and USB subsystem seem to lock
> up, i.e. commands like lsusb begin to fail. The USB device itself is
> also running a 2.6.9 based kernel, but during the time the RX errors
> are seen there is no TX or RX from the device side. Neither are any
> errors reported via /proc/net/dev on the USB side.
> 
> After some debug statements, I see that the RX errors are due to -71
> EPROTO errors. Any help appreciated in understanding what is happening
> here. Here are the related messages (the messages keep repeating):
> 
> ohci_hcd 0000:00:04.0: urb c7881c60 path 2 ep1in 6d160000 cc 6 --> status -71
> mydev3: rx throttle -71
> mydev3: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c3a33ce0 path 2 ep1in 6d160000 cc 6 --> status -71
> mydev3: rx throttle -71
> mydev3: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c3a33e00 path 1 ep1in 6d160000 cc 6 --> status -71
> mydev1: rx throttle -71
> mydev1: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c7881cc0 path 2 ep1in 6d160000 cc 6 --> status -71
> mydev3: rx throttle -71
> ohci_hcd 0000:00:04.0: urb c3a33da0 path 1 ep1in 6d160000 cc 6 --> status -71
> mydev1: rx throttle -71
> mydev3: rxqlen 3 --> 4
> mydev1: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c7881d20 path 1 ep1in 6d160000 cc 6 --> status -71
> mydev1: rx throttle -71
> mydev1: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c7881c00 path 2 ep1in 6d160000 cc 6 --> status -71
> mydev3: rx throttle -71
> mydev3: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c3a33d40 path 1 ep1in 6d160000 cc 6 --> status -71
> mydev1: rx throttle -71
> mydev1: rxqlen 3 --> 4
> ohci_hcd 0000:00:04.0: urb c7881c60 path 2 ep1in 6d160000 cc 6 --> status -71
> mydev3: rx throttle -71

These error codes indicate low-level USB communication problems.  
There may be something wrong with the USB cable, or the device's USB
interface may have stopped running.

Alan Stern


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