Re: Requesting DLT_* values for Ethernet switches proprietary tagging protocol

[Florian Fainelli <f.fainelli () gmail com>]

Le 1/17/19 à 6:29 PM, Guy Harris a écrit :
> On Jan 17, 2019, at 6:01 PM, Florian Fainelli <f.fainelli () gmail com> wrote:
>
> > Correct. The other ports are exposed as regular Ethernet network devices.
>
> OK, I've updated a comment in the pull request for that.
>
> So, in any pre-4.19 kernels, does the directory /sys/class/net/{device}/dsa exist even if there's no tagging file in 
> that directory?

Neither the directory nor the file actually exist.

> Or is there some other way, in pre-4.19 kernels, to determine if a NIC is a DSA management-port NIC?
>
> If so, then, even though you can't determine the tag type from userland, you could offer all the DLT_s for the 
> various tag types in the DLT list and let the user choose which one to use; they might be able to do so if they know 
> what type of device they're capturing on.  (If the tagging file *does* exist, you can just offer them the one DLT_ 
> that's correct for the device.)

Good idea, people would certainly know which device they are capturing
on. Thanks!
-- 
Florian
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