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net: dsa: mv88e6xxx: check hardware VLAN in use

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The DSA drivers now have access to the VLAN prepare phase and the bridge
net_device. It is easier to check for overlapping bridges from within
the driver. Thus add such check in mv88e6xxx_port_vlan_prepare.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2016-02-12 12:09:40 -05:00 committed by David S. Miller
parent a6692754d6
commit da9c359e19
1 changed files with 64 additions and 0 deletions
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64
drivers/net/dsa/mv88e6xxx.c
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@ -1471,14 +1471,78 @@ static int _mv88e6xxx_vlan_init(struct dsa_switch *ds, u16 vid,
return 0;
}
static int mv88e6xxx_port_check_hw_vlan(struct dsa_switch *ds, int port,
u16 vid_begin, u16 vid_end)
{
struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
struct mv88e6xxx_vtu_stu_entry vlan;
int i, err;
if (!vid_begin)
return -EOPNOTSUPP;
mutex_lock(&ps->smi_mutex);
err = _mv88e6xxx_vtu_vid_write(ds, vid_begin - 1);
if (err)
goto unlock;
do {
err = _mv88e6xxx_vtu_getnext(ds, &vlan);
if (err)
goto unlock;
if (!vlan.valid)
break;
if (vlan.vid > vid_end)
break;
for (i = 0; i < ps->num_ports; ++i) {
if (dsa_is_dsa_port(ds, i) || dsa_is_cpu_port(ds, i))
continue;
if (vlan.data[i] ==
GLOBAL_VTU_DATA_MEMBER_TAG_NON_MEMBER)
continue;
if (ps->ports[i].bridge_dev ==
ps->ports[port].bridge_dev)
break; /* same bridge, check next VLAN */
netdev_warn(ds->ports[port],
"hardware VLAN %d already used by %s\n",
vlan.vid,
netdev_name(ps->ports[i].bridge_dev));
err = -EOPNOTSUPP;
goto unlock;
}
} while (vlan.vid < vid_end);
unlock:
mutex_unlock(&ps->smi_mutex);
return err;
}
int mv88e6xxx_port_vlan_prepare(struct dsa_switch *ds, int port,
const struct switchdev_obj_port_vlan *vlan,
struct switchdev_trans *trans)
{
int err;
/* We reserve a few VLANs to isolate unbridged ports */
if (vlan->vid_end >= 4000)
return -EOPNOTSUPP;
/* If the requested port doesn't belong to the same bridge as the VLAN
* members, do not support it (yet) and fallback to software VLAN.
*/
err = mv88e6xxx_port_check_hw_vlan(ds, port, vlan->vid_begin,
vlan->vid_end);
if (err)
return err;
/* We don't need any dynamic resource from the kernel (yet),
* so skip the prepare phase.
*/