netdev - Re: [PATCH 02/13] net: mvneta: enable IP checksum with jumbo frames for Armada 38x on Port0

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Date:	Sun, 22 Nov 2015 22:04:38 +0100
From:	Marcin Wojtas <mw@...ihalf.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Yair Mahalalel <myair@...vell.com>,
	Grzegorz Jaszczyk <jaz@...ihalf.com>,
	Simon Guinot <simon.guinot@...uanux.org>,
	Evan Wang <xswang@...vell.com>, nadavh@...vell.com,
	Lior Amsalem <alior@...vell.com>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Gregory Clément 
	<gregory.clement@...e-electrons.com>, nitroshift@...oo.com,
	"David S. Miller" <davem@...emloft.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 02/13] net: mvneta: enable IP checksum with jumbo frames
 for Armada 38x on Port0

Arnd,

2015-11-22 21:00 GMT+01:00 Arnd Bergmann <arnd@...db.de>:
> On Sunday 22 November 2015 08:53:48 Marcin Wojtas wrote:
>> The Ethernet controller found in the Armada 38x SoC's family support
>> TCP/IP checksumming with frame sizes larger than 1600 bytes, however
>> only on port 0.
>>
>> This commit enables this feature by using 'marvell,armada-xp-neta' in
>> 'ethernet@...00' node.
>>
>> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
>> Cc: <stable@...r.kernel.org> # v3.18+
>> ---
>>  arch/arm/boot/dts/armada-38x.dtsi | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/armada-38x.dtsi b/arch/arm/boot/dts/armada-38x.dtsi
>> index c6a0e9d..b7868b2 100644
>> --- a/arch/arm/boot/dts/armada-38x.dtsi
>> +++ b/arch/arm/boot/dts/armada-38x.dtsi
>> @@ -494,7 +494,7 @@
>>                         };
>>
>>                         eth0: ethernet@...00 {
>> -                               compatible = "marvell,armada-370-neta";
>> +                               compatible = "marvell,armada-xp-neta";
>>                                 reg = <0x70000 0x4000>;
>>                                 interrupts-extended = <&mpic 8>;
>>                                 clocks = <&gateclk 4>;
>>
>
> As it's clear that they are not 100% backwards compatible, please
> add a SoC specific compatible string here as well, like
>
>         compatible = "marvell,armada-380-neta", "marvell,armada-xp-neta";
>

Wouldn't be one sufficient ("marvell,armada-380-neta")?

> Maybe also leave the 370 string in place.
>

Now 370 string disables ip checksum for jumbo frames, so I don't think
it's appropriate to keep it for port 0.

Best regards,
Marcin
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