netdev - Re: [PATCH] drivers: net: gianfar: Shortest frame drops at Ethernet port

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Message-ID: <20191106174602.GV18744@zorba>
Date:   Wed, 6 Nov 2019 09:46:02 -0800
From:   Daniel Walker <danielwa@...co.com>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     Sathish Jarugumalli <sjarugum@...co.com>,
        "xe-linux-external@...co.com" <xe-linux-external@...co.com>,
        Daniel Walker <dwalker@...o99.com>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: net: gianfar: Shortest frame drops at Ethernet
 port

On Wed, Nov 06, 2019 at 05:38:06PM +0000, Claudiu Manoil wrote:
> >-----Original Message-----
> >From: Daniel Walker <danielwa@...co.com>
> >Sent: Wednesday, November 6, 2019 7:03 PM
> >To: Claudiu Manoil <claudiu.manoil@....com>
> >Cc: Sathish Jarugumalli <sjarugum@...co.com>; xe-linux-external@...co.com;
> >Daniel Walker <dwalker@...o99.com>; David S. Miller
> ><davem@...emloft.net>; netdev@...r.kernel.org; linux-
> >kernel@...r.kernel.org
> >Subject: [PATCH] drivers: net: gianfar: Shortest frame drops at Ethernet port
> >
> >NXP has provided the patch for packet drops  at ethernet port
> >Frames shorter than 60bytes are getting dropped at ethernetport
> >need to add padding for the shorter range frames to be transmit
> >the function "eth_skb_pad(skb" provides padding (and CRC) for
> >packets under 60 bytes
> >
> >Signed-off-by: Sathish Jarugumalli <sjarugum@...co.com>
> >Cc: xe-linux-external@...co.com
> >Signed-off-by: Daniel Walker <dwalker@...o99.com>
> 
> Signed-off-by: Claudiu Manoil <claudiu.manoil@....com>
> 
> Normally padding is done by the hardware, and it works at least on my
> test cases and boards.
> But cisco seems to have hit a case where h/w padding gets
> unexpectedly disabled (concurrency issue writing the config register?).
> This patch should go as a workaround, until root cause found.


Where would this hardware setup normally happen? Does it happen in the
bootloader or inside the kernel someplace ?

Daniel