nvme_get_directive_receive_length - Get directive receive length

       dtype       Directive type, see enumnvme_directive_dtype

       doper       Directive receive operation, see enumnvme_directive_receive_doper

       len         On success, set to this directives payload length in bytes.

       nvme_get_directive_receive_length - Get directive receive length

       0 on success, -1 with errno set to EINVAL if the function did not recognize dtype or doper.

August 2025                             nvme_get_directive_receive_length   nvme_get_directive_receive_length(2)

intnvme_get_directive_receive_length(enumnvme_directive_dtypedtype,enumnvme_directive_receive_doperdoper,__u32*len);