mlx5_crypto: failed to switch to crypto operational mode

[Artemii Morozov <Artemii.Morozov@arknetworks.am>]

Hi,

I have ConnectX-6 (MCX653106A-HDAT) NIC and try to use DPDK mlx5_crypto 
driver for crypto offload. I've followed the instructions provided in 
the documentation (https://doc.dpdk.org/guides/cryptodevs/mlx5.html), 
but unfortunately, I've encountered some problems along the way.

The main issue I am experiencing is the inability to switch the NIC to 
crypto operational mode. I am facing a failure in the first step:

```
mlxreg -d /dev/mst/mt4123_pciconf0 --reg_name CRYPTO_OPERATIONAL --get
Sending access register...
-E- Failed to send access register: ME_ICMD_OPERATIONAL_ERROR
```

I use:
- MLX_OFED 5.8-2.0.3.0
- fw 20.35.2000
- I set the CRYPTO_POLICY configuration value to 2 (it also does not 
work with 1 value)

lsmod | grep mlx output:

```
mlx5_ib               450560  0
mlx5_core            2039808  1 mlx5_ib
mlxdevm               176128  1 mlx5_core
ib_uverbs             143360  2 rdma_ucm,mlx5_ib
psample                20480  1 mlx5_core
mlxfw                  32768  1 mlx5_core
tls                   114688  1 mlx5_core
pci_hyperv_intf        16384  1 mlx5_core
ib_core               434176  8 
rdma_cm,ib_ipoib,iw_cm,ib_umad,rdma_ucm,ib_uverbs,mlx5_ib,ib_cm
mlx_compat             69632  11 
rdma_cm,ib_ipoib,mlxdevm,iw_cm,ib_umad,ib_core,rdma_ucm,ib_uverbs,mlx5_ib,ib_cm,mlx5_core

```

Could you please advise me how to solve the problem and what steps to 
take to successfully use this driver?

Thank you.