net: dsa: add switch mdb bitmap functions
This patch brings no functional changes. It moves out the MDB code iterating on a multicast group into new dsa_switch_mdb_{prepare,add}_bitmap() functions. This gives us a better isolation of the two switchdev phases. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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