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

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Message-Id: <20170730.192629.124814765201077334.davem@davemloft.net>
Date:   Sun, 30 Jul 2017 19:26:29 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     andrew@...n.ch
Cc:     netdev@...r.kernel.org, fugang.duan@....com
Subject: Re: [PATCH net-next] net: fec: Allow reception of frames bigger
 than 1522 bytes

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.