From: Andrew Lunn <andrew@lunn.ch>
To: Vladimir Oltean <olteanv@gmail.com>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>,
"David S. Miller" <davem@davemloft.net>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Vivien Didelot <vivien.didelot@gmail.com>,
Joergen Andreasen <joergen.andreasen@microchip.com>,
"Allan W. Nielsen" <allan.nielsen@microchip.com>,
Horatiu Vultur <horatiu.vultur@microchip.com>,
Claudiu Manoil <claudiu.manoil@nxp.com>,
netdev <netdev@vger.kernel.org>,
Vladimir Oltean <vladimir.oltean@nxp.com>
Subject: Re: [PATCH net-next 06/12] net: mscc: ocelot: adjust MTU on the CPU port in NPI mode
Date: Tue, 12 Nov 2019 14:57:11 +0100 [thread overview]
Message-ID: <20191112135711.GJ5090@lunn.ch> (raw)
In-Reply-To: <CA+h21hrb9pc6q9EwjCeApQ0TmC--0s9RT31f640cQ1sxiKtUqw@mail.gmail.com>
On Tue, Nov 12, 2019 at 03:52:51PM +0200, Vladimir Oltean wrote:
> On Tue, 12 Nov 2019 at 15:51, Andrew Lunn <andrew@lunn.ch> wrote:
> >
> > On Tue, Nov 12, 2019 at 02:44:14PM +0200, Vladimir Oltean wrote:
> > > From: Vladimir Oltean <vladimir.oltean@nxp.com>
> > >
> > > When using the NPI port, the DSA tag is passed through Ethernet, so the
> > > switch's MAC needs to accept it as it comes from the DSA master. Increase
> > > the MTU on the external CPU port to account for the length of the
> > > injection header.
> >
> > I think this is the only DSA driver which needs to do this. Generally,
> > the port knows it is adding/removing the extra header, and so
> > magically accepts bigger frames.
> >
> > Where i have seen issues is the other end, the host interface. It
> > sometimes drops 'full MTU' frames because the DSA header makes the
> > frame too big.
> >
>
> No, that worked out of the box because DSA adjusts the MTU of the
> master interface by the amount of bytes specified in the overhead of
> the tagger.
Yes, i added that code, after having to modify too many MAC drivers!
Andrew
next prev parent reply other threads:[~2019-11-12 13:57 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-12 12:44 [PATCH net-next 00/12] DSA driver for Vitesse Felix switch Vladimir Oltean
2019-11-12 12:44 ` [PATCH net-next 01/12] net: mscc: ocelot: move resource ioremap and regmap init to common code Vladimir Oltean
2019-11-12 12:44 ` [PATCH net-next 02/12] net: mscc: ocelot: filter out ocelot SoC specific PCS config from common path Vladimir Oltean
2019-11-12 13:31 ` Andrew Lunn
2019-11-12 21:28 ` Florian Fainelli
2019-11-13 9:40 ` kbuild test robot
2019-11-12 12:44 ` [PATCH net-next 03/12] net: mscc: ocelot: move invariant configs out of adjust_link Vladimir Oltean
2019-11-12 13:35 ` Andrew Lunn
2019-11-12 13:38 ` Vladimir Oltean
2019-11-12 21:30 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 04/12] net: mscc: ocelot: create a helper for changing the port MTU Vladimir Oltean
2019-11-12 13:39 ` Andrew Lunn
2019-11-12 13:41 ` Vladimir Oltean
2019-11-12 21:31 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 05/12] net: mscc: ocelot: export a constant for the tag length in bytes Vladimir Oltean
2019-11-12 13:44 ` Andrew Lunn
2019-11-12 21:32 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 06/12] net: mscc: ocelot: adjust MTU on the CPU port in NPI mode Vladimir Oltean
2019-11-12 13:51 ` Andrew Lunn
2019-11-12 13:52 ` Vladimir Oltean
2019-11-12 13:57 ` Andrew Lunn [this message]
2019-11-12 21:32 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 07/12] net: mscc: ocelot: separate the implementation of switch reset Vladimir Oltean
2019-11-12 13:55 ` Andrew Lunn
2019-11-12 13:59 ` Vladimir Oltean
2019-11-13 8:57 ` Alexandre Belloni
2019-11-12 21:34 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 08/12] net: mscc: ocelot: publish structure definitions to include/soc/mscc/ocelot.h Vladimir Oltean
2019-11-12 14:42 ` Andrew Lunn
2019-11-12 16:18 ` Vladimir Oltean
2019-11-12 21:36 ` Florian Fainelli
2019-11-13 12:48 ` kbuild test robot
2019-11-12 12:44 ` [PATCH net-next 09/12] net: mscc: ocelot: publish ocelot_sys.h to include/soc/mscc Vladimir Oltean
2019-11-12 21:38 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 10/12] net: dsa: vitesse: move vsc73xx driver to a separate folder Vladimir Oltean
2019-11-12 13:09 ` Alexandre Belloni
2019-11-12 13:40 ` Vladimir Oltean
2019-11-12 14:33 ` Allan W. Nielsen
2019-11-12 14:50 ` Andrew Lunn
2019-11-12 14:57 ` Allan W. Nielsen
2019-11-12 15:26 ` Vladimir Oltean
2019-11-12 19:09 ` Allan W. Nielsen
2019-11-12 19:26 ` Vladimir Oltean
2019-11-12 19:48 ` Allan W. Nielsen
2019-11-12 20:01 ` Vladimir Oltean
2019-11-13 7:38 ` Allan W. Nielsen
2019-11-13 8:47 ` Alexandre Belloni
2019-11-12 21:49 ` Florian Fainelli
2019-11-12 12:44 ` [PATCH net-next 11/12] net: dsa: vitesse: add basic Felix switch driver Vladimir Oltean
2019-11-12 12:44 ` [PATCH net-next 12/12] net: dsa: vitesse: add tagger for Ocelot/Felix switches Vladimir Oltean
2019-11-12 21:48 ` Florian Fainelli
2019-11-13 2:14 ` Andrew Lunn
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