linux-kernel - Re: [PATCH v2] rtl8xxxu: Fix the handling of TX A-MPDU aggregation

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Date:   Mon, 9 Aug 2021 20:59:22 +0800
From:   Chris Chiu <chris.chiu@...onical.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Reto Schneider <rs@....ch>, code@...o-schneider.ch,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        jes.sorensen@...il.com, davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH v2] rtl8xxxu: Fix the handling of TX A-MPDU aggregation

On Fri, Aug 6, 2021 at 8:32 PM Kalle Valo <kvalo@...eaurora.org> wrote:
>
> Reto Schneider <rs@....ch> writes:
>
> > On 8/4/21 17:13, chris.chiu@...onical.com wrote:
> >> The TX A-MPDU aggregation is not handled in the driver since the
> >> ieee80211_start_tx_ba_session has never been started properly.
> >> Start and stop the TX BA session by tracking the TX aggregation
> >> status of each TID. Fix the ampdu_action and the tx descriptor
> >> accordingly with the given TID.
> >
> > I'd like to test this but I am not sure what to look for (before and
> > after applying the patch).
>
> Thanks, testing feedback is always very much appreciated.
>
> > What should I look for when looking at the (sniffed) Wireshark traces?
>

If you are able to verify the difference by the air capture, please
refer to https://imgur.com/a/jcFQTc8. You should see more than 1
packet aggregated and sent from your wifi adapter's mac address, and
get the block ack response from the Access Point (also shown in the
image). If TX aggregation is not enabled, you will only see 1 tx
packet from your wifi, and get an ack right after from the AP.

Please also help test if there's any possible regression. Thanks so much.

Chris

> From my (maintainer) point of view most important is that there are no
> regressions visible to users, for example no data stalls, crashes or
> anything like that.
>
> --
> https://patchwork.kernel.org/project/linux-wireless/list/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches