Netmap - Vale switch - tcp problem

[Anthony Arnaud]

Hi everyone!
I would like to create a vale switch with an interface attached with the
host stack and some virtual.
My env is a VM with FBSD-12.1 12.1-RELEASE FreeBSD 12.1-RELEASE r354233
GENERIC  amd64
and VirtIO support.

I performed:

vale-ctl -h vale0:vtnet1
vale-ctl -n vi0
vale-ctl -a vale0:vi0

615.925514 bdg_ctl [149] bridge:0 port:0 vale0:vtnet1
615.925559 bdg_ctl [149] bridge:0 port:1 vale0:vtnet1^
615.925572 bdg_ctl [149] bridge:0 port:2 vale0:vi0

vtnet1 is configured as mirror port.
But if:

tcpdump -i vtnet1
or
tcpdump -i vale0:vi0

why can't I see any TCP packets?
UDP and ICMP packet are ok.

Without vale switch tcpdump show all TCP packets correctly.
It is a bug?
Thanks to all!
<freebsd-net at freebsd.org>