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Date: Mon, 16 Feb 2015 23:17:03 -0800
From: Julian Elischer <julian@freebsd.org>
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To: mike@karels.net, George Neville-Neil <gnn@neville-neil.com>
Subject: Re: Adding new media types to if_media.h
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On 2/16/15 5:50 PM, Mike Karels wrote:
> Well, I developed the prototype as I had planned, using a 64-bit 
> media word, and found that I got about 100 files in GENERIC that 
> didn't compile; 
[...]
> so I went to Plan B. Plan B is to steal an unused bit (RFU) to 
> indicate an "extended" media type. I then used the variant/subtype 
> field to store the extended type.
[...]
> I modified one driver (vtnet) to use an extended type, and the rest 
> of GENERIC is happy. The changes to ifconfig are also fairly small. 
> The patch is appended, where email programs will screw it up, or at 
> ftp://ftp.karels.net/outgoing/if_media.patch. The VFAST subtype is a 
> throw-away for testing. This seems like a reasonably pragmatic 
> change to support the new 40 Gb/s media types until someone wants to 
> design an improved but non-backward- compatible interface. I think 
> it meets the goal of suitability for back-porting; it could be 
> MFCed. Mike Index: sys/net/if_media.h

I like it..  The patch seems appropriately manageable.