netdev - RE: [PATCH net] gianfar: Don't force RGMII mode after reset, use defaults

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Date:   Thu, 20 Feb 2020 11:42:07 +0000
From:   Claudiu Manoil <claudiu.manoil@....com>
To:     "Daniel Walker (danielwa)" <danielwa@...co.com>
CC:     "HEMANT RAMDASI (hramdasi)" <hramdasi@...co.com>,
        "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Sathish Jarugumalli -X (sjarugum - ARICENT TECHNOLOGIES MAURIITIUS
        LIMITED at Cisco)" <sjarugum@...co.com>
Subject: RE: [PATCH net] gianfar: Don't force RGMII mode after reset, use
 defaults

>-----Original Message-----
>From: Daniel Walker (danielwa) <danielwa@...co.com>
>Sent: Wednesday, February 19, 2020 8:58 PM
>To: Claudiu Manoil <claudiu.manoil@....com>
>Cc: HEMANT RAMDASI (hramdasi) <hramdasi@...co.com>; David S . Miller
><davem@...emloft.net>; netdev@...r.kernel.org; Sathish Jarugumalli -X
>(sjarugum - ARICENT TECHNOLOGIES MAURIITIUS LIMITED at Cisco)
><sjarugum@...co.com>
>Subject: Re: [PATCH net] gianfar: Don't force RGMII mode after reset, use
>defaults
>
>On Wed, Nov 13, 2019 at 04:01:39PM +0000, Claudiu Manoil wrote:
>> >-----Original Message-----
>> >From: HEMANT RAMDASI (hramdasi) <hramdasi@...co.com>
>> [..]
>> >
>> >>> This bit must be set when in half-duplex mode (MACCFG2[Full_Duplex]
>is cleared).
>> >>
>> >> Should the bit be clear when in full duplex or it does not matter?
>> >>
>> >
>> >> From my tests, in full duplex mode small frames won't get padded if
>> >> this bit is disabled, and will be counted as undersize frames and
>> >> dropped. So this bit needs to be set in full duplex mode to get packets
>smaller than 64B past the MAC (w/o software padding).
>> >
>> >This is little strange as we do not see this problem on all pkt type,
>> >icmp passes well and we observed issue with tftp ack.
>>
>> I tested on a 1Gbit (full duplex) link, and ARP and small ICMP ipv4
>> packets were not passing with the PAD_CRC bit disabled.
>
>
>Have you looked into this patch any further ?
>

Hi,
I have an idea on how to parameterize the interface mode setting.
Let me try a patch and if it passes on my boards I'll send it as v2.