net/mlx5e: Check for qos capability in dcbnl_initialize
qos capability is the master capability bit that determines if the DCBX is supported for the PCI function. If this bit is off, driver cannot run any dcbx code. Fixes: e207b7e9 ("net/mlx5e: ConnectX-4 firmware support for DCBX") Signed-off-by: NHuy Nguyen <huyn@mellanox.com> Reviewed-by: NParav Pandit <parav@mellanox.com> Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
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