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Date:   Tue, 11 Oct 2022 11:53:09 +0800
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Subject: Re: [PATCH v2 1/2] wifi: ath11k: change to set 11d state instead of
 start 11d scan while disconnect
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To:     Kalle Valo <kvalo@kernel.org>
CC:     <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>
References: <20220928081413.27339-2-quic_wgong@quicinc.com>
 <166542536986.511.1244496445875563981.kvalo@kernel.org>
From:   Wen Gong <quic_wgong@quicinc.com>
In-Reply-To: <166542536986.511.1244496445875563981.kvalo@kernel.org>
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On 10/11/2022 2:09 AM, Kalle Valo wrote:
> Wen Gong <quic_wgong@quicinc.com> wrote:
>
>> When switch to connect to a new AP for station which is already connected
>> to an AP, the time cost is too long, it arrives 10 seconds.
>>
>> The reason is when switch connection, disconnect operation happened on
>> the 1st AP, then 11d scan start command sent to firmware, and then a
>> new hw scan arrived for the 2nd AP. The 11d scan is running at this
>> moment, so the hw scan can not start immediately, it needs to wait
>> the 11d scan finished, it increased the time cost of switch AP and
>> even happened scan fail as log below after apply the incoming patch.
>>
>> [ 1194.815104] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
>> [ 1196.864157] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
>> [ 1198.911926] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
>>
>> Change to set 11d state while disconnect, and the 11d scan will be
>> started after the new hw scan in ath11k_mac_op_hw_scan(). Then the
>> time cost of switching AP is small and not happened scan fail.
>>
>> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
>>
>> Fixes: 9dcf6808b253 ("ath11k: add 11d scan offload support")
>> Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
>> Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
> I still see warnings:
>
> [ 3627.691737] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
> [ 3715.435608] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
> [ 3860.333214] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
> [ 4542.000955] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
> [ 4604.018451] ath11k_pci 0000:06:00.0: failed to start hw scan: -110
The failed log is now happened frequently as before, I will change it 
again to suppress the failed log.
> 2 patches set to Changes Requested.
>
> 12991768 [v2,1/2] wifi: ath11k: change to set 11d state instead of start 11d scan while disconnect
> 12991769 [v2,2/2] wifi: ath11k: reduce the timeout value back for hw scan from 10 seconds to 1 second
>