Update function mlx5_devx_cmd_query_hca_attr() to add the
reg_c_preserve bit query.
The stored metadata in register C may be lost in NIC Tx and
FDB egress while doing one of the following operations:
- packet encapsulation.
- packet mirroring (multiple processing paths).
- packet sampling (using Flow Sampler).
If the reg_c_preserve bit is set to 1, then the above
limitation is obsolete, the all metadata registers Cx
preserve their values even through the operations mentioned
above.
Signed-off-by: Jiawei Wang <jiaweiw@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
efa6a7e200