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

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Message-ID: <VI1PR04MB48805B8F4AE80B3E72D14E7B96760@VI1PR04MB4880.eurprd04.prod.outlook.com>
Date:   Wed, 13 Nov 2019 16:01:39 +0000
From:   Claudiu Manoil <claudiu.manoil@....com>
To:     "HEMANT RAMDASI (hramdasi)" <hramdasi@...co.com>,
        "Daniel Walker (danielwa)" <danielwa@...co.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Sathish Jarugumalli -X (sjarugum - ARICENT TECHNOLOGIES HOLDINGS
        LIMITED at Cisco)" <sjarugum@...co.com>
Subject: RE: [PATCH net] gianfar: Don't force RGMII mode after reset, use
 defaults

>-----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.