Support for fdb_add, mdb_add, fdb_del, mdb_del and
fdb_dump operations. ALU1 and ALU2 are used for fdb operations.
fdb_add: find any existing entries and update the port map.
if ALU1 write is failed and attempt to write ALU2.
If ALU2 is also failed then exit. Clear WRITE_FAIL for both ALU1
& ALU2.
fdb_del: find the matching entry and clear the respective port
in the port map by writing the ALU tables
fdb_dump: read and dump 2 ALUs upto last entry. ALU_START bit is
used to find the last entry. If the read is timed out, then pass
the error message.
mdb_add: Find the empty slot in ALU and update the port map &
mac address by writing the ALU
mdb_del: find the matching entry and delete the respective port
in port map by writing the ALU
For MAC address, could not use upper_32_bits() & lower_32_bits()
as per Vladimir proposal since it gets accessed in terms of 16bits.
I tried to have common API to get 16bits based on index but shifting
seems to be straight-forward.
Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@xxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>