[PATCH] wcn36xx: Fix software-driven scan
Loic Poulain
loic.poulain at linaro.org
Wed Aug 19 04:15:54 EDT 2020
Hi Bryan,
On Tue, 18 Aug 2020 at 20:00, Bryan O'Donoghue
<pure.logic at nexus-software.ie> wrote:
>
> On 18/08/2020 14:34, Loic Poulain wrote:
> > On Tue, 18 Aug 2020 at 08:15, Kalle Valo <kvalo at codeaurora.org> wrote:
> >>
> >> Loic Poulain <loic.poulain at linaro.org> writes:
> >>
> >>> For software-driven scan, rely on mac80211 software scan instead
> >>> of internal driver implementation. The internal implementation
> >>> cause connection trouble since it keep the antenna busy during
> >>> the entire scan duration, moreover it's only a passive scanning
> >>> (no probe request). Therefore, let mac80211 manages sw scan.
> >>>
> >>> Note: we fallback to software scan if firmware does not report
> >>> scan offload support or if we need to scan the 5Ghz band (currently
> >>> not supported by the offload scan...).
> >>>
> >>> Signed-off-by: Loic Poulain <loic.poulain at linaro.org>
> >>> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue at linaro.org>
> >>
> >> What changed since v2? Please always include a changelog so that I don't
> >> need to guess what you have changed in the patch. No need to resend, a
> >> reply is enough.
> >
> > Yes sorry, this patch has been rebased on ath master and squashed with
> > Bryan's fix:
> > wcn36xx: Set sw-scan chan to 0 when not associated
> > No additional changes have been made on top of the initial patches.
> >
> > Regards,
> > Loic
> >
>
> This is excruciatingly slow on Android.
>
> Android I'm finding unlike Debian where this stuff was tested, merrily
> issues scan requests every 30 seconds.
>
> For me this ends up looking like this
>
> [ 162.296995] wcn36xx: mac config changed 0x00000040
> [ 162.297001] wcn36xx: wcn36xx_config channel switch=1
> [ 162.297005] wcn36xx: hal init scan mode 2
> [ 162.300011] wcn36xx: indication arrived
> [ 162.300525] wcn36xx: SMD command (req 4, rsp 5) completed in 4ms
> [ 162.300529] wcn36xx: hal start scan channel 1
> [ 162.306930] wcn36xx: SMD command (req 6, rsp 7) completed in 4ms
>
> Big gap here
>
> [ 162.368198] wcn36xx: mac config changed 0x00000040
> [ 162.368205] wcn36xx: wcn36xx_config channel switch=40
> [ 162.368209] wcn36xx: hal finish scan mode 2
> [ 162.379085] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 162.382218] wcn36xx: indication arrived
> [ 162.583396] wcn36xx: indication arrived
> [ 162.684336] wcn36xx: mac config changed 0x00000040
> [ 162.684344] wcn36xx: wcn36xx_config channel switch=2
> [ 162.684348] wcn36xx: hal init scan mode 2
> [ 162.687547] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 162.687552] wcn36xx: hal start scan channel 2
> [ 162.693935] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 162.756359] wcn36xx: mac config changed 0x00000040
> [ 162.756367] wcn36xx: wcn36xx_config channel switch=40
> [ 162.756371] wcn36xx: hal finish scan mode 2
> [ 162.767361] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 162.770445] wcn36xx: indication arrived
> [ 162.971533] wcn36xx: indication arrived
> [ 163.072318] wcn36xx: mac config changed 0x00000040
> [ 163.072325] wcn36xx: wcn36xx_config channel switch=3
> [ 163.072329] wcn36xx: hal init scan mode 2
> [ 163.075449] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 163.075453] wcn36xx: hal start scan channel 3
> [ 163.081648] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 163.144202] wcn36xx: mac config changed 0x00000040
> [ 163.144210] wcn36xx: wcn36xx_config channel switch=40
> [ 163.144214] wcn36xx: hal finish scan mode 2
> [ 163.155103] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 163.158219] wcn36xx: indication arrived
> [ 163.359477] wcn36xx: indication arrived
> [ 163.460428] wcn36xx: mac config changed 0x00000040
> [ 163.460435] wcn36xx: wcn36xx_config channel switch=4
> [ 163.460439] wcn36xx: hal init scan mode 2
> [ 163.463572] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 163.463576] wcn36xx: hal start scan channel 4
> [ 163.469851] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 163.532373] wcn36xx: mac config changed 0x00000040
> [ 163.532381] wcn36xx: wcn36xx_config channel switch=40
> [ 163.532384] wcn36xx: hal finish scan mode 2
> [ 163.543736] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 163.546987] wcn36xx: indication arrived
> [ 163.747577] wcn36xx: indication arrived
> [ 163.848431] wcn36xx: mac config changed 0x00000040
> [ 163.848439] wcn36xx: wcn36xx_config channel switch=5
> [ 163.848442] wcn36xx: hal init scan mode 2
> [ 163.851668] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 163.851672] wcn36xx: hal start scan channel 5
> [ 163.857929] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 163.920386] wcn36xx: mac config changed 0x00000040
> [ 163.920394] wcn36xx: wcn36xx_config channel switch=40
> [ 163.920398] wcn36xx: hal finish scan mode 2
> [ 163.931279] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 163.934460] wcn36xx: indication arrived
> [ 164.135411] wcn36xx: indication arrived
> [ 164.236376] wcn36xx: mac config changed 0x00000040
> [ 164.236383] wcn36xx: wcn36xx_config channel switch=6
> [ 164.236387] wcn36xx: hal init scan mode 2
> [ 164.239669] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 164.239673] wcn36xx: hal start scan channel 6
> [ 164.245868] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 164.308339] wcn36xx: mac config changed 0x00000040
> [ 164.308347] wcn36xx: wcn36xx_config channel switch=40
> [ 164.308351] wcn36xx: hal finish scan mode 2
> [ 164.319240] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 164.322405] wcn36xx: indication arrived
> [ 164.523510] wcn36xx: indication arrived
> [ 164.624238] wcn36xx: mac config changed 0x00000040
> [ 164.624245] wcn36xx: wcn36xx_config channel switch=7
> [ 164.624249] wcn36xx: hal init scan mode 2
> [ 164.627352] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 164.627356] wcn36xx: hal start scan channel 7
> [ 164.633425] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 164.696365] wcn36xx: mac config changed 0x00000040
> [ 164.696374] wcn36xx: wcn36xx_config channel switch=40
> [ 164.696378] wcn36xx: hal finish scan mode 2
> [ 164.707355] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 164.710683] wcn36xx: indication arrived
> [ 164.911285] wcn36xx: indication arrived
> [ 165.012228] wcn36xx: mac config changed 0x00000040
> [ 165.012236] wcn36xx: wcn36xx_config channel switch=8
> [ 165.012240] wcn36xx: hal init scan mode 2
> [ 165.015434] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 165.015439] wcn36xx: hal start scan channel 8
> [ 165.021509] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 165.084204] wcn36xx: mac config changed 0x00000040
> [ 165.084212] wcn36xx: wcn36xx_config channel switch=40
> [ 165.084217] wcn36xx: hal finish scan mode 2
> [ 165.095164] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 165.098269] wcn36xx: indication arrived
> [ 165.299691] wcn36xx: indication arrived
> [ 165.400304] wcn36xx: mac config changed 0x00000040
> [ 165.400309] wcn36xx: wcn36xx_config channel switch=9
> [ 165.400313] wcn36xx: hal init scan mode 2
> [ 165.403424] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 165.403428] wcn36xx: hal start scan channel 9
> [ 165.409695] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 165.472378] wcn36xx: mac config changed 0x00000040
> [ 165.472386] wcn36xx: wcn36xx_config channel switch=40
> [ 165.472390] wcn36xx: hal finish scan mode 2
> [ 165.483390] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 165.486478] wcn36xx: indication arrived
> [ 165.687641] wcn36xx: indication arrived
> [ 165.788548] wcn36xx: mac config changed 0x00000040
> [ 165.788556] wcn36xx: wcn36xx_config channel switch=10
> [ 165.788561] wcn36xx: hal init scan mode 2
> [ 165.791729] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 165.791734] wcn36xx: hal start scan channel 10
> [ 165.797986] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 165.860337] wcn36xx: mac config changed 0x00000040
> [ 165.860346] wcn36xx: wcn36xx_config channel switch=40
> [ 165.860349] wcn36xx: hal finish scan mode 2
> [ 165.871185] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 165.874560] wcn36xx: indication arrived
> [ 166.075631] wcn36xx: indication arrived
> [ 166.176336] wcn36xx: mac config changed 0x00000040
> [ 166.176344] wcn36xx: wcn36xx_config channel switch=11
> [ 166.176348] wcn36xx: hal init scan mode 2
> [ 166.179753] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 166.179758] wcn36xx: hal start scan channel 11
> [ 166.186033] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 166.248204] wcn36xx: mac config changed 0x00000040
> [ 166.248211] wcn36xx: wcn36xx_config channel switch=40
> [ 166.248216] wcn36xx: hal finish scan mode 2
> [ 166.259127] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 166.262339] wcn36xx: indication arrived
> [ 166.463387] wcn36xx: indication arrived
> [ 166.564353] wcn36xx: mac config changed 0x00000040
> [ 166.564362] wcn36xx: wcn36xx_config channel switch=12
> [ 166.564366] wcn36xx: hal init scan mode 2
> [ 166.567517] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 166.567522] wcn36xx: hal start scan channel 12
> [ 166.573823] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 166.684383] wcn36xx: mac config changed 0x00000040
> [ 166.684390] wcn36xx: wcn36xx_config channel switch=40
> [ 166.684394] wcn36xx: hal finish scan mode 2
> [ 166.695665] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 166.698857] wcn36xx: indication arrived
> [ 166.899623] wcn36xx: indication arrived
> [ 167.000265] wcn36xx: mac config changed 0x00000040
> [ 167.000273] wcn36xx: wcn36xx_config channel switch=13
> [ 167.000277] wcn36xx: hal init scan mode 2
> [ 167.003459] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 167.003463] wcn36xx: hal start scan channel 13
> [ 167.009787] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 167.120339] wcn36xx: mac config changed 0x00000040
> [ 167.120348] wcn36xx: wcn36xx_config channel switch=40
> [ 167.120351] wcn36xx: hal finish scan mode 2
> [ 167.131208] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 167.134376] wcn36xx: indication arrived
> [ 167.335469] wcn36xx: indication arrived
> [ 167.436335] wcn36xx: mac config changed 0x00000040
> [ 167.436343] wcn36xx: wcn36xx_config channel switch=14
> [ 167.436347] wcn36xx: hal init scan mode 2
> [ 167.439492] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 167.439497] wcn36xx: hal start scan channel 14
> [ 167.446075] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 167.556358] wcn36xx: mac config changed 0x00000040
> [ 167.556367] wcn36xx: wcn36xx_config channel switch=40
> [ 167.556372] wcn36xx: hal finish scan mode 2
> [ 167.567787] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 167.570712] wcn36xx: indication arrived
> [ 167.771184] wcn36xx: indication arrived
> [ 167.872093] wcn36xx: mac config changed 0x00000040
> [ 167.872104] wcn36xx: wcn36xx_config channel switch=36
> [ 167.872110] wcn36xx: hal init scan mode 2
> [ 167.875463] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 167.875469] wcn36xx: hal start scan channel 36
> [ 167.880887] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 167.944229] wcn36xx: mac config changed 0x00000040
> [ 167.944238] wcn36xx: wcn36xx_config channel switch=40
> [ 167.944243] wcn36xx: hal finish scan mode 2
> [ 167.953262] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 167.956751] wcn36xx: indication arrived
> [ 168.159485] wcn36xx: indication arrived
> [ 168.260233] wcn36xx: mac config changed 0x00000040
> [ 168.260243] wcn36xx: wcn36xx_config channel switch=40
> [ 168.260248] wcn36xx: hal finish scan mode 2
> [ 168.268055] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 168.332250] wcn36xx: mac config changed 0x00000040
> [ 168.332259] wcn36xx: wcn36xx_config channel switch=40
> [ 168.332264] wcn36xx: hal finish scan mode 2
> [ 168.340018] wcn36xx: SMD command (req 10, rsp 11) completed in 4ms
> [ 168.343231] wcn36xx: indication arrived
> [ 168.547404] wcn36xx: indication arrived
> [ 168.652662] wcn36xx: mac config changed 0x00000040
> [ 168.652666] wcn36xx: wcn36xx_config channel switch=44
> [ 168.652670] wcn36xx: hal init scan mode 2
> [ 168.655732] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 168.655736] wcn36xx: hal start scan channel 44
> [ 168.660968] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 168.772327] wcn36xx: mac config changed 0x00000040
> [ 168.772334] wcn36xx: wcn36xx_config channel switch=40
> [ 168.772338] wcn36xx: hal finish scan mode 2
> [ 168.781369] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 168.784371] wcn36xx: indication arrived
> [ 168.987575] wcn36xx: indication arrived
> [ 169.088390] wcn36xx: mac config changed 0x00000040
> [ 169.088398] wcn36xx: wcn36xx_config channel switch=48
> [ 169.088402] wcn36xx: hal init scan mode 2
> [ 169.091527] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 169.091532] wcn36xx: hal start scan channel 48
> [ 169.097022] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 169.208455] wcn36xx: mac config changed 0x00000040
> [ 169.208463] wcn36xx: wcn36xx_config channel switch=40
> [ 169.208467] wcn36xx: hal finish scan mode 2
> [ 169.218407] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 169.221568] wcn36xx: indication arrived
> [ 169.423420] wcn36xx: indication arrived
> [ 169.524402] wcn36xx: mac config changed 0x00000040
> [ 169.524409] wcn36xx: wcn36xx_config channel switch=52
> [ 169.524413] wcn36xx: hal init scan mode 2
> [ 169.527559] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 169.527563] wcn36xx: hal start scan channel 52
> [ 169.532973] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 169.644216] wcn36xx: mac config changed 0x00000040
> [ 169.644223] wcn36xx: wcn36xx_config channel switch=40
> [ 169.644227] wcn36xx: hal finish scan mode 2
> [ 169.653367] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 169.656579] wcn36xx: indication arrived
> [ 169.859998] wcn36xx: indication arrived
> [ 169.960478] wcn36xx: mac config changed 0x00000040
> [ 169.960489] wcn36xx: wcn36xx_config channel switch=56
> [ 169.960494] wcn36xx: hal init scan mode 2
> [ 169.963757] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 169.963762] wcn36xx: hal start scan channel 56
> [ 169.969107] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 170.080126] wcn36xx: mac config changed 0x00000040
> [ 170.080136] wcn36xx: wcn36xx_config channel switch=40
> [ 170.080141] wcn36xx: hal finish scan mode 2
> [ 170.089183] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 170.092346] wcn36xx: indication arrived
> [ 170.295765] wcn36xx: indication arrived
> [ 170.396072] wcn36xx: mac config changed 0x00000040
> [ 170.396079] wcn36xx: wcn36xx_config channel switch=60
> [ 170.396083] wcn36xx: hal init scan mode 2
> [ 170.399139] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 170.399144] wcn36xx: hal start scan channel 60
> [ 170.404547] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 170.516260] wcn36xx: mac config changed 0x00000040
> [ 170.516268] wcn36xx: wcn36xx_config channel switch=40
> [ 170.516272] wcn36xx: hal finish scan mode 2
> [ 170.525323] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 170.528989] wcn36xx: indication arrived
> [ 170.731306] wcn36xx: indication arrived
> [ 170.832258] wcn36xx: mac config changed 0x00000040
> [ 170.832266] wcn36xx: wcn36xx_config channel switch=64
> [ 170.832270] wcn36xx: hal init scan mode 2
> [ 170.835453] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 170.835457] wcn36xx: hal start scan channel 64
> [ 170.840746] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 170.952490] wcn36xx: mac config changed 0x00000040
> [ 170.952497] wcn36xx: wcn36xx_config channel switch=40
> [ 170.952501] wcn36xx: hal finish scan mode 2
> [ 170.961563] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 170.964663] wcn36xx: indication arrived
> [ 171.167256] wcn36xx: indication arrived
> [ 171.268465] wcn36xx: mac config changed 0x00000040
> [ 171.268474] wcn36xx: wcn36xx_config channel switch=100
> [ 171.268478] wcn36xx: hal init scan mode 2
> [ 171.271622] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 171.271626] wcn36xx: hal start scan channel 100
> [ 171.277068] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 171.388309] wcn36xx: mac config changed 0x00000040
> [ 171.388316] wcn36xx: wcn36xx_config channel switch=40
> [ 171.388320] wcn36xx: hal finish scan mode 2
> [ 171.397462] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 171.400449] wcn36xx: indication arrived
> [ 171.603380] wcn36xx: indication arrived
> [ 171.704307] wcn36xx: mac config changed 0x00000040
> [ 171.704315] wcn36xx: wcn36xx_config channel switch=104
> [ 171.704318] wcn36xx: hal init scan mode 2
> [ 171.707472] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 171.707476] wcn36xx: hal start scan channel 104
> [ 171.712907] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 171.824322] wcn36xx: mac config changed 0x00000040
> [ 171.824330] wcn36xx: wcn36xx_config channel switch=40
> [ 171.824334] wcn36xx: hal finish scan mode 2
> [ 171.833404] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 171.836577] wcn36xx: indication arrived
> [ 172.039628] wcn36xx: indication arrived
> [ 172.140321] wcn36xx: mac config changed 0x00000040
> [ 172.140329] wcn36xx: wcn36xx_config channel switch=108
> [ 172.140333] wcn36xx: hal init scan mode 2
> [ 172.143442] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 172.143447] wcn36xx: hal start scan channel 108
> [ 172.149071] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 172.260211] wcn36xx: mac config changed 0x00000040
> [ 172.260219] wcn36xx: wcn36xx_config channel switch=40
> [ 172.260222] wcn36xx: hal finish scan mode 2
> [ 172.269482] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 172.272333] wcn36xx: indication arrived
> [ 172.475588] wcn36xx: indication arrived
> [ 172.576210] wcn36xx: mac config changed 0x00000040
> [ 172.576217] wcn36xx: wcn36xx_config channel switch=112
> [ 172.576221] wcn36xx: hal init scan mode 2
> [ 172.579357] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 172.579362] wcn36xx: hal start scan channel 112
> [ 172.584763] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 172.696318] wcn36xx: mac config changed 0x00000040
> [ 172.696325] wcn36xx: wcn36xx_config channel switch=40
> [ 172.696329] wcn36xx: hal finish scan mode 2
> [ 172.705421] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 172.708542] wcn36xx: indication arrived
> [ 172.911501] wcn36xx: indication arrived
> [ 173.012248] wcn36xx: mac config changed 0x00000040
> [ 173.012255] wcn36xx: wcn36xx_config channel switch=116
> [ 173.012259] wcn36xx: hal init scan mode 2
> [ 173.015521] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 173.015532] wcn36xx: hal start scan channel 116
> [ 173.020870] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 173.132338] wcn36xx: mac config changed 0x00000040
> [ 173.132346] wcn36xx: wcn36xx_config channel switch=40
> [ 173.132350] wcn36xx: hal finish scan mode 2
> [ 173.141388] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 173.144426] wcn36xx: indication arrived
> [ 173.347588] wcn36xx: indication arrived
> [ 173.448338] wcn36xx: mac config changed 0x00000040
> [ 173.448347] wcn36xx: wcn36xx_config channel switch=120
> [ 173.448350] wcn36xx: hal init scan mode 2
> [ 173.451499] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 173.451503] wcn36xx: hal start scan channel 120
> [ 173.456889] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 173.568336] wcn36xx: mac config changed 0x00000040
> [ 173.568344] wcn36xx: wcn36xx_config channel switch=40
> [ 173.568348] wcn36xx: hal finish scan mode 2
> [ 173.577465] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 173.580602] wcn36xx: indication arrived
> [ 173.783414] wcn36xx: indication arrived
> [ 173.884494] wcn36xx: mac config changed 0x00000040
> [ 173.884504] wcn36xx: wcn36xx_config channel switch=124
> [ 173.884508] wcn36xx: hal init scan mode 2
> [ 173.887627] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 173.887633] wcn36xx: hal start scan channel 124
> [ 173.892978] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 174.004293] wcn36xx: mac config changed 0x00000040
> [ 174.004303] wcn36xx: wcn36xx_config channel switch=40
> [ 174.004308] wcn36xx: hal finish scan mode 2
> [ 174.013188] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 174.017060] wcn36xx: indication arrived
> [ 174.219812] wcn36xx: indication arrived
> [ 174.320551] wcn36xx: mac config changed 0x00000040
> [ 174.320559] wcn36xx: wcn36xx_config channel switch=128
> [ 174.320563] wcn36xx: hal init scan mode 2
> [ 174.324192] wcn36xx: SMD command (req 4, rsp 5) completed in 4ms
> [ 174.324197] wcn36xx: hal start scan channel 128
> [ 174.329545] wcn36xx: SMD command (req 6, rsp 7) completed in 4ms
> [ 174.440367] wcn36xx: mac config changed 0x00000040
> [ 174.440374] wcn36xx: wcn36xx_config channel switch=40
> [ 174.440378] wcn36xx: hal finish scan mode 2
> [ 174.449705] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 174.452983] wcn36xx: indication arrived
> [ 174.655452] wcn36xx: indication arrived
> [ 174.756428] wcn36xx: mac config changed 0x00000040
> [ 174.756438] wcn36xx: wcn36xx_config channel switch=132
> [ 174.756443] wcn36xx: hal init scan mode 2
> [ 174.759554] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 174.759560] wcn36xx: hal start scan channel 132
> [ 174.764959] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 174.876237] wcn36xx: mac config changed 0x00000040
> [ 174.876245] wcn36xx: wcn36xx_config channel switch=40
> [ 174.876250] wcn36xx: hal finish scan mode 2
> [ 174.885310] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 174.888341] wcn36xx: indication arrived
> [ 175.091324] wcn36xx: indication arrived
> [ 175.192423] wcn36xx: mac config changed 0x00000040
> [ 175.192430] wcn36xx: wcn36xx_config channel switch=140
> [ 175.192433] wcn36xx: hal init scan mode 2
> [ 175.195530] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 175.195534] wcn36xx: hal start scan channel 140
> [ 175.200805] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 175.312321] wcn36xx: mac config changed 0x00000040
> [ 175.312329] wcn36xx: wcn36xx_config channel switch=40
> [ 175.312333] wcn36xx: hal finish scan mode 2
> [ 175.321295] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 175.324800] wcn36xx: indication arrived
> [ 175.527611] wcn36xx: indication arrived
> [ 175.628313] wcn36xx: mac config changed 0x00000040
> [ 175.628320] wcn36xx: wcn36xx_config channel switch=149
> [ 175.628324] wcn36xx: hal init scan mode 2
> [ 175.631414] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 175.631419] wcn36xx: hal start scan channel 149
> [ 175.636846] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 175.748358] wcn36xx: mac config changed 0x00000040
> [ 175.748367] wcn36xx: wcn36xx_config channel switch=40
> [ 175.748371] wcn36xx: hal finish scan mode 2
> [ 175.758146] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 175.761536] wcn36xx: indication arrived
> [ 175.963887] wcn36xx: indication arrived
> [ 176.064314] wcn36xx: mac config changed 0x00000040
> [ 176.064322] wcn36xx: wcn36xx_config channel switch=153
> [ 176.064326] wcn36xx: hal init scan mode 2
> [ 176.067659] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 176.067663] wcn36xx: hal start scan channel 153
> [ 176.072911] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 176.184091] wcn36xx: mac config changed 0x00000040
> [ 176.184099] wcn36xx: wcn36xx_config channel switch=40
> [ 176.184104] wcn36xx: hal finish scan mode 2
> [ 176.193195] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 176.196177] wcn36xx: indication arrived
> [ 176.399382] wcn36xx: indication arrived
> [ 176.500288] wcn36xx: mac config changed 0x00000040
> [ 176.500295] wcn36xx: wcn36xx_config channel switch=157
> [ 176.500299] wcn36xx: hal init scan mode 2
> [ 176.503417] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 176.503421] wcn36xx: hal start scan channel 157
> [ 176.508762] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 176.620389] wcn36xx: mac config changed 0x00000040
> [ 176.620396] wcn36xx: wcn36xx_config channel switch=40
> [ 176.620400] wcn36xx: hal finish scan mode 2
> [ 176.629516] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 176.632609] wcn36xx: indication arrived
> [ 176.835319] wcn36xx: indication arrived
> [ 176.936427] wcn36xx: mac config changed 0x00000040
> [ 176.936435] wcn36xx: wcn36xx_config channel switch=161
> [ 176.936440] wcn36xx: hal init scan mode 2
> [ 176.939590] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 176.939595] wcn36xx: hal start scan channel 161
> [ 176.945005] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 177.056380] wcn36xx: mac config changed 0x00000040
> [ 177.056388] wcn36xx: wcn36xx_config channel switch=40
> [ 177.056392] wcn36xx: hal finish scan mode 2
> [ 177.065466] wcn36xx: SMD command (req 10, rsp 11) completed in 8ms
> [ 177.068489] wcn36xx: indication arrived
> [ 177.271739] wcn36xx: indication arrived
> [ 177.372381] wcn36xx: mac config changed 0x00000040
> [ 177.372389] wcn36xx: wcn36xx_config channel switch=165
> [ 177.372393] wcn36xx: hal init scan mode 2
> [ 177.375538] wcn36xx: SMD command (req 4, rsp 5) completed in 0ms
> [ 177.375543] wcn36xx: hal start scan channel 165
> [ 177.380982] wcn36xx: SMD command (req 6, rsp 7) completed in 8ms
> [ 177.492402] wcn36xx: mac config changed 0x00000040
> [ 177.492409] wcn36xx: wcn36xx_config channel switch=40
> [ 177.492413] wcn36xx: hal finish scan mode 2
>
> Basically it takes 15 seconds to complete.
>
> Interleaved scan seems very slow and is IMO unusable on Android
The software scan is driven by mac80211 which interleaves channels scanning
with the regular data operations. In worst case, it scans during 111ms on the
channel and switches back to the operating channel for 200ms.
So, with 35 channels to scan that would take about 11 seconds to complete...
So yes, it's quite slow...
>
> After this change - on Android with scan interleaving
>
> console:/ # iperf3 -c 192.168.50.167 -i 1 -t 320
>
> Connecting to host 192.168.50.167, port 5201
> [ 5] local 192.168.50.244 port 33132 connected to 192.168.50.167 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 1.09 MBytes 9.15 Mbits/sec 0 79.2 KBytes
>
> [ 5] 1.00-2.00 sec 954 KBytes 7.82 Mbits/sec 0 116 KBytes
>
> [ 5] 2.00-3.00 sec 891 KBytes 7.30 Mbits/sec 0 158 KBytes
>
> [ 5] 3.00-4.00 sec 764 KBytes 6.25 Mbits/sec 0 199 KBytes
>
> [ 5] 4.00-5.00 sec 764 KBytes 6.26 Mbits/sec 0 219 KBytes
>
> ^C[ 5] 5.00-5.09 sec 382 KBytes 33.8 Mbits/sec 0 221
> KBytes
>
> Before this change - with Android issuing periodic scans on the same 30
> second cadence.
>
> console:/ # iperf3 -c 192.168.50.167 -i 1 -t 320
>
> Connecting to host 192.168.50.167, port 5201
> [ 5] local 192.168.50.244 port 54378 connected to 192.168.50.167 port 5201
> [ ID] Interval Transfer Bitrate Retr Cwnd
> [ 5] 0.00-1.00 sec 4.57 MBytes 38.3 Mbits/sec 2 148 KBytes
>
> [ 5] 1.00-2.00 sec 14.2 MBytes 119 Mbits/sec 1 164 KBytes
>
> [ 5] 2.00-3.00 sec 14.9 MBytes 125 Mbits/sec 2 173 KBytes
>
> [ 5] 3.00-4.00 sec 14.7 MBytes 124 Mbits/sec 2 133 KBytes
>
> [ 5] 4.00-5.00 sec 15.0 MBytes 126 Mbits/sec 1 148 KBytes
>
> [ 5] 5.00-6.00 sec 14.8 MBytes 124 Mbits/sec 5 164 KBytes
>
> [ 5] 6.00-7.00 sec 15.1 MBytes 127 Mbits/sec 1 178 KBytes
>
> ^C[ 5] 7.00-7.39 sec 5.72 MBytes 124 Mbits/sec 2 147 KBytes
>
> I wasn't seeing this on Debian because wpa_supplicant on my test system
> doesn't behave this way.
>
> I wonder would we be better off trying to serialize txrx::*tx with the
> old scan method ?
>
> Accepted it would be a passive scan but sw_scan seems to be so very very
> slow - we might be beter off.
Well, the problem with the old method is that driver only listen
passively 30ms on each channel, so scan result can be quite
incomplete since there is a huge chance to miss AP beacons
(which are usually sent every 100ms), and you lose the
directed scanning support (for hidden AP, roaming, etc...).
Moreover, I remember the old method was causing some instabilities
due to stopping RX while the whole duration of scanning (about 1s in
your case).
Ideally, the driver should implement hardware-assisted scanning
correctly to completely get rid of software scanning. But as you
noticed it only works for 2.4Ghz AP right now. However, one remaining
thing to try would be to send an update-channel-list command to the
firmware before each offload scan (cf UPDATE_CHANNEL_LIST_REQ
in the downstream driver). That's not something I've tried yet.
Regards,
Loic
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