netdev - Re: [net-next PATCH v2 2/3] net: macb: Add support for jumbo frames

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Date:	Tue, 5 May 2015 09:51:41 +0530
From:	Harini Katakam <harinikatakamlinux@...il.com>
To:	Jaeden Amero <jaeden.amero@...com>
Cc:	Harini Katakam <harini.katakam@...inx.com>,
	nicolas.ferre@...el.com, davem@...emloft.net,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	boris.brezillon@...e-electrons.com,
	alexandre.belloni@...e-electrons.com, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>,
	"michals@...inx.com" <michals@...inx.com>
Subject: Re: [net-next PATCH v2 2/3] net: macb: Add support for jumbo frames

Hi,

On Tue, May 5, 2015 at 12:32 AM, Jaeden Amero <jaeden.amero@...com> wrote:
> On 05/04/2015 02:52 AM, Harini Katakam wrote:
>> Check for "cdns,zynqmp-gem" compatible string and enable jumbo frame support
>> in NWCFG register, update descriptor length masks and registers accordingly.
>> Jumbo max length register should be set according to support in SoC; it is
>> set to 10240 for Zynq Ultrascale+ MPSoC.
>>
>> Signed-off-by: Harini Katakam <harinik@...inx.com>
>> Reviewed-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
>> ---
>>
>> On v1, Michal commented that I should use macb_config for jumbo parameters
>> instead of defining them by reading the compatible string directly.
>> I can use .caps for isjumbo. But jumbo-max-length needs to be defined.
>> Can I add this to the structure? Any suggestions on how to handle this?
>>
>> v2:
>> Add constant definition and update SoC name
>>
>> ---
>>  drivers/net/ethernet/cadence/macb.c |   21 ++++++++++++++++++---
>>  drivers/net/ethernet/cadence/macb.h |    8 ++++++++
>>  2 files changed, 26 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
<snip>
>> @@ -2762,6 +2772,11 @@ static int macb_probe(struct platform_device *pdev)
>>       bp->pclk = pclk;
>>       bp->hclk = hclk;
>>       bp->tx_clk = tx_clk;
>> +     if (of_device_is_compatible(pdev->dev.of_node, "cdns,zynqmp-gem")) {
>> +             bp->isjumbo = 1;
>> +             bp->jumbo_max_len = GEM_ZYNQMP_JUMBO_MAX;
>
> Could you use the bottom 16 bits of DCFG2 instead of GEM_ZYNQMP_JUMBO_MAX?

The bottom 16 bits are 0x3FFF but the ZynqMP SoC actually supports
only upto 10K (0x2800).

Regards,
Harini
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