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net: mscc: ocelot: refuse to overwrite the port's native vlan

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The switch driver keeps a "vid" variable per port, which signifies _the_
VLAN ID that is stripped on that port's egress (aka the native VLAN on a
trunk port).

That is the way the hardware is designed (mostly). The port->vid is
programmed into REW:PORT:PORT_VLAN_CFG:PORT_VID and the rewriter is told
to send all traffic as tagged except the one having port->vid.

There exists a possibility of finer-grained egress untagging decisions:
using the VCAP IS1 engine, one rule can be added to match every
VLAN-tagged frame whose VLAN should be untagged, and set POP_CNT=1 as
action. However, the IS1 can hold at most 512 entries, and the VLANs are
in the order of 6 * 4096.

So the code is fine for now. But this sequence of commands:

$ bridge vlan add dev swp0 vid 1 pvid untagged
$ bridge vlan add dev swp0 vid 2 untagged

makes untagged and pvid-tagged traffic be sent out of swp0 as tagged
with VID 1, despite user's request.

Prevent that from happening. The user should temporarily remove the
existing untagged VLAN (1 in this case), add it back as tagged, and then
add the new untagged VLAN (2 in this case).

Cc: Antoine Tenart <antoine.tenart@bootlin.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Fixes: 7142529f16 ("net: mscc: ocelot: add VLAN filtering")
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2019-10-26 21:04:27 +03:00 committed by David S. Miller
parent 1c44ce560b
commit b9cd75e668
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/mscc/ocelot.c
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@ -261,8 +261,15 @@ static int ocelot_vlan_vid_add(struct net_device *dev, u16 vid, bool pvid,
port->pvid = vid; port->pvid = vid;
/* Untagged egress vlan clasification */ /* Untagged egress vlan clasification */
if (untagged) if (untagged && port->vid != vid) {
if (port->vid) {
dev_err(ocelot->dev,
"Port already has a native VLAN: %d\n",
port->vid);
return -EBUSY;
}
port->vid = vid; port->vid = vid;
}
ocelot_vlan_port_apply(ocelot, port); ocelot_vlan_port_apply(ocelot, port);