linux-kernel - Re: [PATCH v2 1/2] rtl8xxxu: unset the hw capability HAS_RATE

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Date:   Fri, 13 Aug 2021 10:26:24 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Chris Chiu <chris.chiu@...onical.com>
Cc:     Jes.Sorensen@...il.com, kvalo@...eaurora.org, davem@...emloft.net,
        kuba@...nel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        code@...o-schneider.ch
Subject: Re: [PATCH v2 1/2] rtl8xxxu: unset the hw capability
 HAS_RATE_CONTROL

On Fri, 2021-06-11 at 22:47 +0800, Chris Chiu wrote:
> 
> Based on the description in
> https://github.com/torvalds/linux/blob/master/net/mac80211/agg-tx.c#L32
> to L36, if we set HAS_RATE_CONTROL, which means we don't want the
> software rate control (default minstrel), then we will have to deal
> with both the rate control and the TX aggregation in the driver, and
> the .ampdu_action is not really required. 
> 

I don't think this is true. You'll probably still want to use the A-MPDU
state machine in mac80211, etc.

What you *don't* get without rate control in mac80211 is any decision on
whether or not to enable A-MPDU, but that's something you can easily do
elsewhere and just call ieee80211_start_tx_ba_session() at an
appropriate point in time.

johannes