[v3,0/2] Add OCP extended log to nvme QEMU

Message

Joel Granados Nov. 16, 2022, 5:14 p.m. UTC

The motivation and description are contained in the last patch in this set.
Will copy paste it here for convenience:

    In order to evaluate write amplification factor (WAF) within the storage
    stack it is important to know the number of bytes written to the
    controller. The existing SMART log value of Data Units Written is too
    coarse (given in units of 500 Kb) and so we add the SMART health
    information extended from the OCP specification (given in units of bytes).

    To accommodate different vendor specific specifications like OCP, we add a
    multiplexing function (nvme_vendor_specific_log) which will route to the
    different log functions based on arguments and log ids. We only return the
    OCP extended smart log when the command is 0xC0 and ocp has been turned on
    in the args.

    Though we add the whole nvme smart log extended structure, we only populate
    the physical_media_units_{read,written}, log_page_version and
    log_page_uuid.

V3 changes:
1. Corrected a bunch of checkpatch issues. Since I changed the first patch
   I did not include the reviewed-by.
2. Included some documentation in nvme.rst for the ocp argument
3. Squashed the ocp arg changes into the main patch.
4. Fixed several comments and an open parenthesis
5. Hex values are now in lower case.
6. Change the reserved format to rsvd<BYTEOFFSET>
7. Made sure that NvmeCtrl is the first arg in all the functions.
8. Fixed comment on commit of main patch

V2 changes:
1. I moved the ocp parameter from the namespace to the subsystem as it is
   defined there in the OCP specification
2. I now accumulate statistics from all namespaces and report them back on
   the extended log as per the spec.
3. I removed the default case in the switch in nvme_vendor_specific_log as
   it does not have any special function.

Joel Granados (2):
  nvme: Move adjustment of data_units{read,written}
  nvme: Add physical writes/reads from OCP log

 docs/system/devices/nvme.rst |  7 ++++
 hw/nvme/ctrl.c               | 69 ++++++++++++++++++++++++++++++++----
 hw/nvme/nvme.h               |  1 +
 include/block/nvme.h         | 36 +++++++++++++++++++
 4 files changed, 107 insertions(+), 6 deletions(-)