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net: dsa: reference count the FDB addresses at the cross-chip notifier level

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The same concerns expressed for host MDB entries are valid for host FDBs
just as well:

- in the case of multiple bridges spanning the same switch chip, deleting
  a host FDB entry that belongs to one bridge will result in breakage to
  the other bridge
- not deleting FDB entries across DSA links means that the switch's
  hardware tables will eventually run out, given enough wear&tear

So do the same thing and introduce reference counting for CPU ports and
DSA links using the same data structures as we have for MDB entries.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean
2021-06-29 17:06:52 +03:00
committed by David S. Miller
parent 3dc80afc50
commit 3f6e32f92a
3 changed files with 88 additions and 7 deletions
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6
net/dsa/dsa2.c
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@@ -348,6 +348,7 @@ static int dsa_port_setup(struct dsa_port *dp)
if (dp->setup)
return 0;
INIT_LIST_HEAD(&dp->fdbs);
INIT_LIST_HEAD(&dp->mdbs);
switch (dp->type) {
@@ -471,6 +472,11 @@ static void dsa_port_teardown(struct dsa_port *dp)
break;
}
list_for_each_entry_safe(a, tmp, &dp->fdbs, list) {
list_del(&a->list);
kfree(a);
}
list_for_each_entry_safe(a, tmp, &dp->mdbs, list) {
list_del(&a->list);
kfree(a);