bnxt_en: Implement DCBNL to support host-based DCBX.
Support only IEEE DCBX initially. Add IEEE DCBNL ops and functions to get and set the hardware DCBX parameters. The DCB code is conditional on Kconfig CONFIG_BNXT_DCB. Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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