some hardware may still not work...
I am testing mvebu espressobin board with Topaz switch :
The Marvell® Link Street®-88E6341 device look like to still have problem with the script from [Solved] MT7530 DSA Port-mirroring - #4 by mpa
I get some success with IP... Mini tutorial for DSA network config - #64 by erdoukki
another (old) method get me some success : Passive TAP / HUB and Ethernet Bridge - #33 by erdoukki