| commit | f46b05f8f3f45276ff36d65b8d4151a9dfc9c5d4 | [log] [tgz] |
|---|---|---|
| author | Martin Lueker-Boden <martin.lueker-boden@wdc.com> | Tue Dec 28 16:43:25 2021 -0800 |
| committer | Martin Lueker-Boden <47870387+martin-lueker@users.noreply.github.com> | Sat Jan 01 11:44:02 2022 -0800 |
| tree | 3b3e4a01c54a4c013f1f77e7afce37d84d99b517 | |
| parent | bf6f6d15ba147ea7b0d95ff5b7cbca0789172e7c [diff] |
[entropy_src, dv] New RNG failure seqeunces In order to improve the testing of health checks this commit introduces a new entropy_src_base_rng_seq. This sequence is an extension of the push_pull_indefinite_host_seq, but it provides new methods to control (and predict) the randomization of the RNG data. There are now three modes of operation for the RNG sequence: - Typical: Of the three modes this is the highest entropy. In this base class, this typical entropy is ideal however a derived class could be made to generate weaker entropy - Soft failure: the entropy of the RNG sequence is degraded either through bias or correlations in the output stream. In the base class however, the soft failure mode is the same as typical. - Hard failure: In this mode one or more bits becomes "stuck", which is a complete failure of the RNG stream. Entry into the soft or hard failure modes is random. There are two vairables hard_mtbf, and soft_mtbf (mean time before failure) which control average time before failing into one of these states. If the parent vseq identifies that the RNG sequence has encountered a failure (perhaps through an alert) it can call the reset_rng sequence. Signed-off-by: Martin Lueker-Boden <martin.lueker-boden@wdc.com>
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