netdev - Re: [RFC] sh_eth: use RNC mode for R8A7790

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Message-ID: <534BD8F9.5080105@codethink.co.uk>
Date:	Mon, 14 Apr 2014 13:47:53 +0100
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	netdev@...r.kernel.org
CC:	linux-sh@...r.kernel.org, magnus.damm@...nsource.se,
	nobuhiro.iwamatsu.yj@...esas.com
Subject: Re: [RFC] sh_eth: use RNC mode for R8A7790

On 28/03/14 20:38, Sergei Shtylyov wrote:
> Hello.
>
> On 03/28/2014 07:46 PM, Ben Dooks wrote:
>
>> The current behaviour of the sh_eth driver is not to use the RNC bit
>> for the receive ring. This means that every packet recieved is not only
>> generating an IRQ but it also stops the receive ring DMA as well until
>> the driver re-enables it after unloading the packet.
>
>> This means that a number of the following errors are generated due to
>> the receive packet FIFO overflowing due to nowhere to put packets:
>
>>     net eth0: Receive FIFO Overflow
>
>> Setting the RMCR_RNC configuration has so far been tested with an NFS
>> root filesystem and the driver has not failed yet. It is not yet known
>> why this is not set for R8A779x operation
>
>     The reason is simple: it's not set on almost all 100 Mbs devices
> except SH7757 (and most recently added R7S72100), so this was a matter
> of copy-paste. I've had setting this bit on at least R-Car devices on my
> aganda for some time but couldn't get to it yet.
>
>> (Feedback on this issue or other testing is welcome)
>
>     OK, I'll try it with netperf UDP test known to generate handful of
> the aforementioned errors, when I have time.
>
> WBR, Sergei

Has anyone had time to look at this?


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius
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