netdev - Re: mt76x2e hardware restart

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Date:   Wed, 16 Oct 2019 18:38:42 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Oleksandr Natalenko <oleksandr@...alenko.name>
Cc:     linux-mediatek@...ts.infradead.org, Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Roy Luo <royluo@...gle.com>, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: mt76x2e hardware restart

> Hello.
> 
> On 15.10.2019 18:52, Oleksandr Natalenko wrote:
> > Thanks for the answer and the IRC discussion. As agreed I've applied
> > [1] and [2], and have just swapped the card to try it again. So far,
> > it works fine in 5 GHz band in 802.11ac mode as an AP.
> > 
> > I'll give it more load with my phone over evening, and we can discuss
> > what to do next (if needed) tomorrow again. Or feel free to drop me an
> > email today.
> > 
> > Thanks for your efforts.
> > 
> > [1]
> > https://github.com/LorenzoBianconi/wireless-drivers-next/commit/cf3436c42a297967235a9c9778620c585100529e.patch
> > [2]
> > https://github.com/LorenzoBianconi/wireless-drivers-next/commit/aad256eb62620f9646d39c1aa69234f50c89eed8.patch
> 
> As agreed, here are iperf3 results, AP to STA distance is 2 meters.
> 
> Client sends, TCP:
> 
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-10.00  sec  70.4 MBytes  59.0 Mbits/sec  3800
> sender
> [  5]   0.00-10.03  sec  70.0 MBytes  58.6 Mbits/sec
> receiver
> 
> Client receives, TCP:
> 
> [ ID] Interval           Transfer     Bitrate         Retr
> [  5]   0.00-10.06  sec   196 MBytes   163 Mbits/sec  3081
> sender
> [  5]   0.00-10.01  sec   191 MBytes   160 Mbits/sec
> receiver
> 
> Client sends, UDP, 128 streams:
> 
> [ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total
> Datagrams
> [SUM]   0.00-10.00  sec   160 MBytes   134 Mbits/sec  0.000 ms  0/115894
> (0%)  sender
> [SUM]   0.00-10.01  sec   160 MBytes   134 Mbits/sec  0.347 ms  0/115892
> (0%)  receiver
> 
> Client receives, UDP, 128 streams:
> 
> [ ID] Interval           Transfer     Bitrate         Jitter    Lost/Total
> Datagrams
> [SUM]   0.00-10.01  sec   119 MBytes  99.4 Mbits/sec  0.000 ms  0/85888 (0%)
> sender
> [SUM]   0.00-10.00  sec   119 MBytes  99.5 Mbits/sec  0.877 ms  0/85888 (0%)
> receiver
> 
> Given the HW is not the most powerful, the key point here is that nothing
> crashed after doing these tests.

Hi Oleksandr,

thx a lot for testing these 2 patches. Now we need to understand why the chip
hangs if we enable scatter gather dma transfer on x86 while it is working fine
on multiple mips/arm devices (patch 2/2 just disable it for debugging).

Regards,
Lorenzo

> 
> -- 
>   Oleksandr Natalenko (post-factum)

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