Re: [PATCH 5/5] ath10k: reduce invalid ht params rate message noise

[Shuah Khan]

On 2/10/21 1:28 AM, Kalle Valo wrote:
> Wen Gong <wgong@xxxxxxxxxxxxxx> writes:
>
> > On 2021-02-10 08:42, Shuah Khan wrote:
> > > ath10k_mac_get_rate_flags_ht() floods dmesg with the following
> > > messages,
> > > when it fails to find a match for mcs=7 and rate=1440.
> > >
> > > supported_ht_mcs_rate_nss2:
> > > {7,  {1300, 2700, 1444, 3000} }
> > >
> > > ath10k_pci 0000:02:00.0: invalid ht params rate 1440 100kbps nss 2
> > > mcs 7
> > >
> > > dev_warn_ratelimited() isn't helping the noise. Use dev_warn_once()
> > > instead.
> > >
> > > Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
> > > ---
> > >   drivers/net/wireless/ath/ath10k/mac.c | 5 +++--
> > >   1 file changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/net/wireless/ath/ath10k/mac.c
> > > b/drivers/net/wireless/ath/ath10k/mac.c
> > > index 3545ce7dce0a..276321f0cfdd 100644
> > > --- a/drivers/net/wireless/ath/ath10k/mac.c
> > > +++ b/drivers/net/wireless/ath/ath10k/mac.c
> > > @@ -8970,8 +8970,9 @@ static void ath10k_mac_get_rate_flags_ht(struct
> > > ath10k *ar, u32 rate, u8 nss, u8
> > >   		*bw |= RATE_INFO_BW_40;
> > >   		*flags |= RATE_INFO_FLAGS_SHORT_GI;
> > >   	} else {
> > > -		ath10k_warn(ar, "invalid ht params rate %d 100kbps nss %d mcs %d",
> > > -			    rate, nss, mcs);
> > > +		dev_warn_once(ar->dev,
> > > +			      "invalid ht params rate %d 100kbps nss %d mcs %d",
> > > +			      rate, nss, mcs);
> > >   	}
> > >   }
> >
> > The {7,  {1300, 2700, 1444, 3000} } is a correct value.
> > The 1440 is report from firmware, its a wrong value, it has fixed in
> > firmware.
>
> In what version?

Here is the info:

ath10k_pci 0000:02:00.0: qca6174 hw3.2 target 0x05030000 chip_id 
0x00340aff sub 17aa:0827

ath10k_pci 0000:02:00.0: firmware ver WLAN.RM.4.4.1-00140-QCARMSWPZ-1 
api 6 features wowlan,ignore-otp,mfp crc32 29eb8ca1

ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 4ac0889b

ath10k_pci 0000:02:00.0: htt-ver 3.60 wmi-op 4 htt-op 3 cal otp max-sta 
32 raw 0 hwcrypto 1

> > If change it to dev_warn_once, then it will have no chance to find the
> > other wrong values which report by firmware, and it indicate
> > a wrong value to mac80211/cfg80211 and lead "iw wlan0 station dump"
> > get a wrong bitrate.

Agreed.

> I agree, we should keep this warning. If the firmware still keeps
> sending invalid rates we should add a specific check to ignore the known
> invalid values, but not all of them.

Would it be helpful to adjust the default rate limits and set the to
a higher value instead. It might be difficult to account all possible
invalid values?

Something like, ath10k_warn_ratelimited() to adjust the

DEFAULT_RATELIMIT_INTERVAL and DEFAULT_RATELIMIT_BURST using
DEFINE_RATELIMIT_STATE

Let me know if you like this idea. I can send a patch in to do this.
I will hang on to this firmware version for a little but longer, so
we have a test case. :)

thanks,
-- Shuah