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

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Date:   Wed, 19 Feb 2020 18:57:47 +0000
From:   "Daniel Walker (danielwa)" <danielwa@...co.com>
To:     Claudiu Manoil <claudiu.manoil@....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

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 ?

Daniel