Currently, IPv4 routes are flushed in ->exit_batch() after
all devices are unregistered.
Unlike IPv6, IPv4 routes are not added from the fast path,
so we can flush routes before default_device_exit_batch().
Let's call ip_fib_net_exit() from ->exit_rtnl() to save
one RTNL locking dance.
ip_fib_net_exit() must use list_del_rcu() for fib_table
for the fast path on dying dev.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260612063225.455191-6-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
759923cf03