Libnvme currently links to openssl and uses the openssl APIs for TLS PSK computation. We noticed NVMe/TCP TLS connection failures, which were later traced to TLS handshake failures from the logs.

1. nvme connect -t tcp -w 10.231.152.100  -a 10.232.130.250 -n nqn.1992-08.com.netapp:sn.2af740e2b8fe11ee8b08d039ea3b292e:subsystem.ss2 --tls --tls_key=0x2bc2ae2e
   Failed to write to /dev/nvme-fabrics: Input/output error
   could not add new controller: failed to write to nvme-fabrics device

And tailing the messages file revealed the TLS handshake error:

1. tail -f /var/log/messages
   2024-06-04T12:36:48.503021-04:00 ste-san-02 tlshd[30037]: gnutls: A TLS fatal alert has been received. (-12)
   2024-06-04T12:36:48.503124-04:00 ste-san-02 tlshd[30037]: Handshake with 'ste-virt-a400-02-d1.gdl.englab.netapp.com' (10.232.130.250) failed
   ^C