Re: [Bugme-new] [Bug 28532] New: Link state change detection problem on Moschip MCS7832 [mcs7830]

[Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>]

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On Mon, 7 Feb 2011 18:14:56 GMT
bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=28532
> 
>            Summary: Link state change detection problem on Moschip MCS7832
>                     [mcs7830]
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 2.6.38-rc2
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: drivers_network-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
>         ReportedBy: myxal.mxl-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
>         Regression: No
> 
> 
> Created an attachment (id=46752)
>  --> (https://bugzilla.kernel.org/attachment.cgi?id=46752)
> lsusb -vv output
> 
> Hi.
> 
> I have a network adapter which uses the aforementioned driver and while
> checking for the link state via ethtool reports the correct state, many
> networking userspace utilities seem to have no clue about it (NM 0.8.1 starts
> dhclient BEFORE any cable is plugged) - and more importantly, don't notice when
> the cable is (dis)connected. Since there's not even a kernel message when
> (dis)connecting the cable, I suspect the driver does not implement Link state
> change detection at all. Is this accurate?
> 
> LSCD works in Windows, where it's apparently implemented through periodic
> polling (judging by virtualbox's blinking USB icon).
> How is this situation normally handled? Is it kernel's job to do the polling?
> Or are userspace utilities expected to do this?
> 
> Docs to the chip are available here:
> http://www.moschip.com/data/products/MCS7830/Data%20Sheet_7830.pdf
> 

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