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net: bridge: fdb: don't flush ext_learn entries

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When a user-space software manages fdb entries externally it should
set the ext_learn flag which marks the fdb entry as externally managed
and avoids expiring it (they're treated as static fdbs). Unfortunately
on events where fdb entries are flushed (STP down, netlink fdb flush
etc) these fdbs are also deleted automatically by the bridge. That in turn
causes trouble for the managing user-space software (e.g. in MLAG setups
we lose remote fdb entries on port flaps).
These entries are completely externally managed so we should avoid
automatically deleting them, the only exception are offloaded entries
(i.e. BR_FDB_ADDED_BY_EXT_LEARN + BR_FDB_OFFLOADED). They are flushed as
before.

Fixes: eb100e0e24 ("net: bridge: allow to add externally learned entries from user-space")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2020-09-28 18:30:02 +03:00 committed by David S. Miller
parent a4be47afb0
commit f2f3729fb6
1 changed files with 2 additions and 0 deletions
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2
net/bridge/br_fdb.c
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@ -413,6 +413,8 @@ void br_fdb_delete_by_port(struct net_bridge *br,
if (!do_all)
if (test_bit(BR_FDB_STATIC, &f->flags) ||
(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) &&
!test_bit(BR_FDB_OFFLOADED, &f->flags)) ||
(vid && f->key.vlan_id != vid))
continue;