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net: dsa: b53: Prevent tagged VLAN on port 7 for 7278 

On 7278, port 7 of the switch connects to the ASP UniMAC which is not
capable of processing VLAN tagged frames. We can still allow the port to
be part of a VLAN entry, and we may want it to be untagged on egress on
that VLAN because of that limitation.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2020-03-30 14:38:48 -07:00 committed by David S. Miller
parent d7a0b1f765
commit 88631864da
1 changed files with 8 additions and 0 deletions
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8
drivers/net/dsa/b53/b53_common.c
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@ -1355,6 +1355,14 @@ int b53_vlan_prepare(struct dsa_switch *ds, int port,
if ((is5325(dev) || is5365(dev)) && vlan->vid_begin == 0)
return -EOPNOTSUPP;
/* Port 7 on 7278 connects to the ASP's UniMAC which is not capable of
* receiving VLAN tagged frames at all, we can still allow the port to
* be configured for egress untagged.
*/
if (dev->chip_id == BCM7278_DEVICE_ID && port == 7 &&
!(vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED))
return -EINVAL;
if (vlan->vid_end > dev->num_vlans)
return -ERANGE;