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

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Date: Mon, 6 May 2024 03:21:17 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Parthiban.Veerasooran@...rochip.com
Cc: ramon.nordin.rodriguez@...roamp.se, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	horms@...nel.org, saeedm@...dia.com, anthony.l.nguyen@...el.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	corbet@....net, linux-doc@...r.kernel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, Horatiu.Vultur@...rochip.com,
	ruanjinjie@...wei.com, Steen.Hegelund@...rochip.com,
	vladimir.oltean@....com, UNGLinuxDriver@...rochip.com,
	Thorsten.Kummermehr@...rochip.com, Pier.Beruto@...emi.com,
	Selvamani.Rajagopal@...emi.com, Nicolas.Ferre@...rochip.com,
	benjamin.bigler@...nformulastudent.ch
Subject: Re: [PATCH net-next v4 05/12] net: ethernet: oa_tc6: implement error
 interrupts unmasking

> [  285.482275] LAN865X Rev.B0 Internal Phy spi0.0:00: attached PHY 
> driver (mii_bus:phy_addr=spi0.0:00, irq=POLL)
> [  285.534760] lan865x spi0.0 eth1: Link is Up - 10Mbps/Half - flow 
> control off
> [  341.466221] eth1: Receive buffer overflow error
> [  345.730222] eth1: Receive buffer overflow error
> [  345.891126] eth1: Receive buffer overflow error
> [  346.074220] eth1: Receive buffer overflow error

Generally we only log real errors. Is a receive buffer overflow a real
error? I would say not. But it would be good to count it.

There was also the open question, what exactly does a receive buffer
overflow mean?

The spec says:

  9.2.8.11 RXBOE

  Receive Buffer Overflow Error. When set, this bit indicates that the
  receive buffer (from the network) has overflowed and receive frame
  data was lost.

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