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Date: Mon, 4 Apr 2022 23:33:52 +0200
From: Peter Seiderer <ps.report@....net>
To: linux-wireless@...r.kernel.org
Cc: Johannes Berg <johannes@...solutions.net>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Felix Fietkau <nbd@....name>
Subject: Re: [PATCH v1] mac80211: minstrel_ht: fix where rate stats are
stored (fixes debugfs output)
+ CC: Felix Fietkau
On Mon, 4 Apr 2022 18:54:14 +0200, Peter Seiderer <ps.report@....net> wrote:
> Using an ath9k card the debugfs output of minstrel_ht looks like the following
> (note the zero values for the first four rates sum-of success/attempts):
>
> best ____________rate__________ ____statistics___ _____last____ ______sum-of________
> mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]
> OFDM 1 DP 6.0M 272 1640 5.2 3.1 53.8 3 0 0 0 0
> OFDM 1 C 9.0M 273 1104 7.7 4.6 53.8 4 0 0 0 0
> OFDM 1 B 12.0M 274 836 10.0 6.0 53.8 4 0 0 0 0
> OFDM 1 A S 18.0M 275 568 14.3 8.5 53.8 5 0 0 0 0
> OFDM 1 S 24.0M 276 436 18.1 0.0 0.0 5 0 1 80 1778
> OFDM 1 36.0M 277 300 24.9 0.0 0.0 0 0 1 0 107
> OFDM 1 S 48.0M 278 236 30.4 0.0 0.0 0 0 0 0 75
> OFDM 1 54.0M 279 212 33.0 0.0 0.0 0 0 0 0 72
>
> Total packet count:: ideal 16582 lookaround 885
> Average # of aggregated frames per A-MPDU: 1.0
>
> Debugging showed that the rate statistics for the first four rates where
> stored in the MINSTREL_CCK_GROUP instead of the MINSTREL_OFDM_GROUP because
> in minstrel_ht_get_stats() the supported check was not honoured as done in
> various other places, e.g net/mac80211/rc80211_minstrel_ht_debugfs.c:
>
> 74 if (!(mi->supported[i] & BIT(j)))
> 75 continue;
>
> With the patch applied the output looks good:
>
> best ____________rate__________ ____statistics___ _____last____ ______sum-of________
> mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]
> OFDM 1 D 6.0M 272 1640 5.2 5.2 100.0 3 0 0 1 1
> OFDM 1 C 9.0M 273 1104 7.7 7.7 100.0 4 0 0 38 38
> OFDM 1 B 12.0M 274 836 10.0 9.9 89.5 4 2 2 372 395
> OFDM 1 A P 18.0M 275 568 14.3 14.3 97.2 5 52 53 6956 7181
> OFDM 1 S 24.0M 276 436 18.1 0.0 0.0 0 0 1 6 163
> OFDM 1 36.0M 277 300 24.9 0.0 0.0 0 0 1 0 35
> OFDM 1 S 48.0M 278 236 30.4 0.0 0.0 0 0 0 0 38
> OFDM 1 S 54.0M 279 212 33.0 0.0 0.0 0 0 0 0 38
>
> Total packet count:: ideal 7097 lookaround 287
> Average # of aggregated frames per A-MPDU: 1.0
>
> Signed-off-by: Peter Seiderer <ps.report@....net>
> ---
> net/mac80211/rc80211_minstrel_ht.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
> index 9c6ace858107..5a6bf46a4248 100644
> --- a/net/mac80211/rc80211_minstrel_ht.c
> +++ b/net/mac80211/rc80211_minstrel_ht.c
> @@ -362,6 +362,9 @@ minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
>
> group = MINSTREL_CCK_GROUP;
> for (idx = 0; idx < ARRAY_SIZE(mp->cck_rates); idx++) {
> + if (!(mi->supported[group] & BIT(idx)))
> + continue;
> +
> if (rate->idx != mp->cck_rates[idx])
> continue;
>
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