On Tue, Feb 28, 2017 at 6:03 AM, 颜小波 <yanxb...@163.com> wrote: > But I don’t find any rcu_read_lock invoked before travelling fdb_head list. > In vxlan_xmit and vxlan_snoop function, vxlan_find_mac function is called to > search the vxlan_fdb of the dst_mac or src_mac. Then information in vxlan_fdb > is used for further process. But as no rcu_read_lock is obtained before the > list travelling, I am wondering if it is possible that vxlan_fdb is freed > when it is being used. >
In both RX and TX paths, rcu read lock is acquired by upper layer. Check __dev_queue_xmit() and process_backlog().
