netdev - Re: [PATCH] mac80211_hwsim: indicate support for 60GHz channels

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Message-ID: <d919fd21c36bd72955ff18190fe628eae438b098.camel@sipsolutions.net>
Date:   Wed, 14 Apr 2021 17:09:53 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Ramon Fontes <ramonreisfontes@...il.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        kvalo@...eaurora.org, davem@...emloft.net
Subject: Re: [PATCH] mac80211_hwsim: indicate support for 60GHz channels

On Wed, 2021-04-14 at 12:06 -0300, Ramon Fontes wrote:
> > Advertise 60GHz channels to mac80211.
> Oh.. That was a mistake. Sorry for that.
> 
> Anyway, can we indicate 60GHz support even though it is not being
> supported by mac80211 yet?
> 
No, that makes no sense. DMG operation is significantly different from
non-DMG operation, even the A-MSDU format for example (an abbreviated
format called "short A-MSDU" is used in DMG). Similarly beacons, etc.,
all kinds of operations are significantly different.

Adding 60 GHz channels to hwsim would be essentially operating as non-
DMG yet on a DMG channel, which makes no sense.

I don't think anyone's planning to add DMG support to mac80211, and in
the absence of a real driver requiring that it wouldn't make sense
anyway. Quite possibly, it simply doesn't make sense period, because DMG
operation is sufficiently different.

johannes