net/cxgbe: use firmware API for validating filter spec
Add new firmware API FW_PARAM_DEV_FILTER_MODE_MASK to fetch
the filtermode and filtermask values configured in hardware,
which are used to validate the match combinations in the filter
spec before offloading the filter rules to hardware. For older
firmware that doesn't support the new API, fallback to older way
of directly reading from indirect registers
Signed-off-by: Karra Satwik <kaara.satwik@chelsio.com>
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>