[Differential] D25681: if_spppsubr: Define a few LCP options, Recognize (but still reject) multilink PPP config options

[Eugene Grosbein]

CCing Roman Kurakin (ce(4)) and Serge Vakulenko (cp(4)), see later.

16.07.2020 9:23, neel_neelc.org (Neel Chauhan) wrote:

> neel_neelc.org abandoned this revision.
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> REPOSITORY
>   rS FreeBSD src repository
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> CHANGES SINCE LAST ACTION
>   https://reviews.freebsd.org/D25681/new/
> 
> REVISION DETAIL
>   https://reviews.freebsd.org/D25681

I wonder if we really have use cases for sppp(4)/ng_sppp(4) these days.

This code was created in 199x to support some synchronous Cronyx adapters and their drivers:

ce(4) for PCI G.703/E1 card,
cp(4) for PCI V.35/RS-232/RS-530/RS-449/X.21/G.703/E1/E3/T3/STS-1 cards,
and cx(4)/ctau(4) for some ISA cards but these do not exist in FreeBSD 13 anymore,
removed by emaste@ recently.

Both ce(4) and cp(4) are i386-only drivers at present.

I could not find any other consumers of sppp code in base system and
I doubt there are outside base, but I may be wrong.

I'd like to see some comments from rik and vak, though.