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net: dsa: tag_8021q: add VLANs to the master interface too

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The whole purpose of tag_8021q is to send VLAN-tagged traffic to the
CPU, from which the driver can decode the source port and switch id.

Currently this only works if the VLAN filtering on the master is
disabled. Change that by explicitly adding code to tag_8021q.c to add
the VLANs corresponding to the tags to the filter of the master
interface.

Because we now need to call vlan_vid_add, then we also need to hold the
RTNL mutex. Propagate that requirement to the callers of dsa_8021q_setup
and modify the existing call sites as appropriate. Note that one call
path, sja1105_best_effort_vlan_filtering_set -> sja1105_vlan_filtering
-> sja1105_setup_8021q_tagging, was already holding this lock.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
2020-09-21 03:10:30 +03:00
committed by David S. Miller
parent 2209158c90
commit bbed0bbddd
3 changed files with 27 additions and 2 deletions
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7
drivers/net/dsa/sja1105/sja1105_main.c
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@@ -3038,7 +3038,11 @@ static int sja1105_setup(struct dsa_switch *ds)
* default, and that means vlan_filtering is 0 since they're not under
* a bridge, so it's safe to set up switch tagging at this time.
*/
return sja1105_setup_8021q_tagging(ds, true);
rtnl_lock();
rc = sja1105_setup_8021q_tagging(ds, true);
rtnl_unlock();
return rc;
}
static void sja1105_teardown(struct dsa_switch *ds)
@@ -3532,6 +3536,7 @@ static int sja1105_probe(struct spi_device *spi)
return -ENOMEM;
priv->dsa_8021q_ctx->ops = &sja1105_dsa_8021q_ops;
priv->dsa_8021q_ctx->proto = htons(ETH_P_8021Q);
priv->dsa_8021q_ctx->ds = ds;
INIT_LIST_HEAD(&priv->dsa_8021q_ctx->crosschip_links);