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

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Date:   Fri, 26 Feb 2021 11:01:52 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Kalle Valo <kvalo@...eaurora.org>, Wen Gong <wgong@...eaurora.org>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, ath10k@...ts.infradead.org,
        kuba@...nel.org, davem@...emloft.net,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH 5/5] ath10k: reduce invalid ht params rate message noise

On 2/11/21 4:24 AM, Kalle Valo wrote:
> Shuah Khan <skhan@...uxfoundation.org> writes:
> 
>> On 2/10/21 1:28 AM, Kalle Valo wrote:
>>> Wen Gong <wgong@...eaurora.org> 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@...uxfoundation.org>
>>>>> ---
>>>>>    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. :)
> 
> I would rather first try to fix the root cause, which is the firmware
> sending invalid rates. Wen, you mentioned there's a fix in firmware. Do
> you know which firmware version (and branch) has the fix?
> 

Picking this back up. Wen, which firmware version has this fix? I can
test this on my system and get rid of the noisy messages. :)

thanks,
-- Shuah