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net: bridge: fdb: avoid two atomic bitops in br_fdb_external_learn_add() 

If we setup the fdb flags prior to calling fdb_create() we can avoid
two atomic bitops when learning a new entry.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2019-11-01 14:46:38 +02:00 committed by David S. Miller
parent be0c567797
commit 31f1155bdc
1 changed files with 5 additions and 4 deletions
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9
net/bridge/br_fdb.c
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@ -1113,14 +1113,15 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
fdb = br_fdb_find(br, addr, vid);
if (!fdb) {
fdb = fdb_create(br, p, addr, vid, 0);
unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN);
if (swdev_notify)
flags |= BIT(BR_FDB_ADDED_BY_USER);
fdb = fdb_create(br, p, addr, vid, flags);
if (!fdb) {
err = -ENOMEM;
goto err_unlock;
}
if (swdev_notify)
set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags);
set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags);
fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
} else {
fdb->updated = jiffies;