MLX5_FPGA_CAP_ARR_SZ
CTASSERT(MLX5_FPGA_CAP_ARR_SZ == MLX5_ST_SZ_DW(fpga_cap));
#define MLX5_FPGA_CAP _IOR('m', 0x85, uint32_t[MLX5_FPGA_CAP_ARR_SZ])