Wen Gong <quic_wgong@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
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
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
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220928081413.27339-2-quic_wgong@xxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
