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

Wen Gong [off-list ref] writes:

On 2021-02-10 08:42, Shuah Khan wrote:

quoted

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@linuxfoundation.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?

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.

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.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

On 2/10/21 1:28 AM, Kalle Valo wrote:

Wen Gong [off-list ref] writes:

quoted

On 2021-02-10 08:42, Shuah Khan wrote:

quoted

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@linuxfoundation.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

quoted

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