netdev - Re: [PATCH net-next] net: fec: Allow reception of frames bigger than 1522 bytes

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Message-ID: <20170731022726.GA30155@lunn.ch>
Date:   Mon, 31 Jul 2017 04:27:26 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, fugang.duan@....com
Subject: Re: [PATCH net-next] net: fec: Allow reception of frames bigger than
 1522 bytes

On Sun, Jul 30, 2017 at 07:26:29PM -0700, David Miller wrote:
> From: Andrew Lunn <andrew@...n.ch>
> Date: Sun, 30 Jul 2017 19:36:05 +0200
> 
> > The FEC Receive Control Register has a 14 bit field indicating the
> > longest frame that my be received. It is being set to 1522. Frames
> > longer than this are discarded, but counted as being in error.
> > 
> > When using DSA, frames from the switch has an additional header,
> > either 4 or 8 bytes if a Marvell switch is used. Thus a full MTU frame
> > of 1522 bytes received by the switch on a port becomes 1530 bytes when
> > passed to the host via the FEC interface.
> > 
> > Change the maximum receive size to 2048 - 64, where 64 is the maximum
> > rx_alignment applied on the receive buffer for AVB capable FEC
> > cores. Use this value also for the maximum receive buffer size. The
> > driver is already allocating a receive SKB of 2048 bytes, so this
> > change should not have any significant effects.
> > 
> > Tested on imx51, imx6, vf610.
> > 
> > Signed-off-by: Andrew Lunn <andrew@...n.ch>
> 
> Applied with commit log message typo fixed.

Hi David

Thanks for fixing the typo.

       Andrew