From: Florian Fainelli <f.fainelli@gmail.com>
To: Vladimir Oltean <olteanv@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org
Cc: Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Richard Cochran <richardcochran@gmail.com>,
Claudiu Manoil <claudiu.manoil@nxp.com>,
Alexandru Marginean <alexandru.marginean@nxp.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Xiaoliang Yang <xiaoliang.yang_1@nxp.com>,
Hongbo Wang <hongbo.wang@nxp.com>,
Vladimir Oltean <vladimir.oltean@nxp.com>,
Po Liu <po.liu@nxp.com>, Yangbo Lu <yangbo.lu@nxp.com>,
Maxim Kochetkov <fido_max@inbox.ru>,
Eldar Gasanov <eldargasanov2@gmail.com>,
Andrey L <al@b4comtech.com>,
Tobias Waldekranz <tobias@waldekranz.com>,
UNGLinuxDriver@microchip.com
Subject: Re: [PATCH v5 net-next 05/10] net: mscc: ocelot: don't use NPI tag prefix for the CPU port module
Date: Wed, 20 Jan 2021 19:41:30 -0800 [thread overview]
Message-ID: <ac20223a-d08f-b9ac-5648-6f15c844dbdd@gmail.com> (raw)
In-Reply-To: <20210121023616.1696021-6-olteanv@gmail.com>
On 1/20/2021 6:36 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp.com>
>
> Context: Ocelot switches put the injection/extraction frame header in
> front of the Ethernet header. When used in NPI mode, a DSA master would
> see junk instead of the destination MAC address, and it would most
> likely drop the packets. So the Ocelot frame header can have an optional
> prefix, which is just "ff:ff:ff:ff:ff:fe > ff:ff:ff:ff:ff:ff" padding
> put before the actual tag (still before the real Ethernet header) such
> that the DSA master thinks it's looking at a broadcast frame with a
> strange EtherType.
>
> Unfortunately, a lesson learned in commit 69df578c5f4b ("net: mscc:
> ocelot: eliminate confusion between CPU and NPI port") seems to have
> been forgotten in the meanwhile.
>
> The CPU port module and the NPI port have independent settings for the
> length of the tag prefix. However, the driver is using the same variable
> to program both of them.
>
> There is no reason really to use any tag prefix with the CPU port
> module, since that is not connected to any Ethernet port. So this patch
> makes the inj_prefix and xtr_prefix variables apply only to the NPI
> port (which the switchdev ocelot_vsc7514 driver does not use).
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
--
Florian
next prev parent reply other threads:[~2021-01-21 5:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 2:36 [PATCH v5 net-next 00/10] tag_8021q for Ocelot switches Vladimir Oltean
2021-01-21 2:36 ` [PATCH v5 net-next 01/10] net: dsa: tag_8021q: add helpers to deduce whether a VLAN ID is RX or TX VLAN Vladimir Oltean
2021-01-21 2:36 ` [PATCH v5 net-next 02/10] net: mscc: ocelot: export VCAP structures to include/soc/mscc Vladimir Oltean
2021-01-21 2:36 ` [PATCH v5 net-next 03/10] net: mscc: ocelot: store a namespaced VCAP filter ID Vladimir Oltean
2021-01-21 2:36 ` [PATCH v5 net-next 04/10] net: mscc: ocelot: reapply bridge forwarding mask on bonding join/leave Vladimir Oltean
2021-01-21 3:40 ` Florian Fainelli
2021-01-21 2:36 ` [PATCH v5 net-next 05/10] net: mscc: ocelot: don't use NPI tag prefix for the CPU port module Vladimir Oltean
2021-01-21 3:41 ` Florian Fainelli [this message]
2021-01-21 2:36 ` [PATCH v5 net-next 06/10] net: dsa: document the existing switch tree notifiers and add a new one Vladimir Oltean
2021-01-21 3:43 ` Florian Fainelli
2021-01-21 2:36 ` [PATCH v5 net-next 07/10] net: dsa: allow changing the tag protocol via the "tagging" device attribute Vladimir Oltean
2021-01-21 3:53 ` Florian Fainelli
2021-01-21 12:23 ` Vladimir Oltean
2021-01-21 2:36 ` [PATCH v5 net-next 08/10] net: dsa: felix: convert to the new .{set,del}_tag_protocol DSA API Vladimir Oltean
2021-01-21 4:02 ` Florian Fainelli
2021-01-21 2:36 ` [PATCH v5 net-next 09/10] net: dsa: add a second tagger for Ocelot switches based on tag_8021q Vladimir Oltean
2021-01-21 4:05 ` Florian Fainelli
2021-01-21 2:36 ` [PATCH v5 net-next 10/10] net: dsa: felix: perform switch setup for tag_8021q Vladimir Oltean
2021-01-21 4:10 ` Florian Fainelli
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