netdev - Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error interrupts unmasking

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Message-ID: <ZjoiHMeKkab4XR-1@builder>
Date: Tue, 7 May 2024 14:44:12 +0200
From: Ramón Nordin Rodriguez <ramon.nordin.rodriguez@...roamp.se>
To: Piergiorgio Beruto <Pier.Beruto@...emi.com>
Cc: Andrew Lunn <andrew@...n.ch>,
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Subject: Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error
 interrupts unmasking

> The RXBOE is basically a warning, indicating that for some reason the SPI host is not fast enough in retrieving frames from the device.
> In my experience, this is typically caused by excessive latency of the SPI driver, or if you have an unoptimized network driver for the MACPHY.

Definetly tracks with what I'm seeing, got two macphys, one is sharing
the bus with a can transiever, getting more RX overflows on that
interface.

> Thanks,
> Piergiorgio
> 
> Which is a bit ambiguous. I would hope it means the receiver has dropped the packet. It will not be passed to the host. But other than maybe count it, i don't think there is anything to do. But Ramón was suggesting you actually drop the frame currently be transferred over the SPI bus?
> 
> 	Andrew

This was misscommunicated on my part. In my happy-hacking adventures I
got better throughput when dropping more chunks in the driver code.

--

Suddenly I can't reproduce the hang, I'll give it one more attempt today
though. Did some measurements with a better oscilloscope, I'm seeing a
periodic latency of ~500us for clearing the irq, typically it's
considerably shorter, and a periodic ~1ms silence on the wire.

But since I can't reproduce the hang this is just performance related.

R