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Date: Thu, 26 Feb 2015 10:39:02 +0100
From: Hans Petter Selasky <hps@selasky.org>
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To: mike@karels.net, Gleb Smirnoff <glebius@FreeBSD.org>
Subject: Re: Adding new media types to if_media.h
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Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>,
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Hi,

I'm doing some work for Mellanox and we need some 100GBase types for 
coming hardware products too.

I think we are not using the 32-bits of "ifm_media" well enough.

Has it been discussed to add more bits to "IFM_NMASK" and have more 
ethernet types like IFM_ETHER_0, IFM_ETHER_1, IFM_ETHER_2, IFM_ETHER_3 ....

Currently 5 IFM types are defined. If 2 more bits can be added to 
IFM_NMASK we have 5 bits total giving us 2**5 = 32 IFM types. Then it 
should be possible to define "(32 - 5) * 32 = 864" more ethernet types, 
which I think should be enough for now - or we add even one more bit to 
IFM_NMASK ?

--HPS