[PATCH V5 0/6] hw/block/nvme: support multi-path for ctrl/ns

[Minwoo Im <minwoo.im.dev@gmail.com>]

Hello,

Here's fifth patch series for the support of NVMe subsystem scheme with
multi-controller and namespace sharing in a subsystem.

This series has applied review comments from the previous series,
mostly from Keith's review.  Thanks Keith!

Here's test result with a simple 'nvme list -v' command from this model
with adding a ZNS example with subsys.

  -device nvme-subsys,id=subsys0 \
  -device nvme,serial=foo,id=nvme0,subsys=subsys0 \
  -device nvme,serial=bar,id=nvme1,subsys=subsys0 \
  -device nvme,serial=baz,id=nvme2,subsys=subsys0 \
  -device nvme-ns,id=ns1,drive=drv10,nsid=1,subsys=subsys0 \
  -device nvme-ns,id=ns2,drive=drv11,nsid=2,bus=nvme2 \
  \
  -device nvme,serial=qux,id=nvme3 \
  -device nvme-ns,id=ns3,drive=drv12,nsid=3,bus=nvme3 \
  \
  -device nvme-subsys,id=subsys1 \
  -device nvme,serial=quux,id=nvme4,subsys=subsys1 \
  -device nvme-ns,id=ns4,drive=drv13,nsid=1,subsys=subsys1,zoned=true \

  root@vm:~/work# nvme list -v
  NVM Express Subsystems

  Subsystem        Subsystem-NQN                                                                                    Controllers
  ---------------- ------------------------------------------------------------------------------------------------ ----------------
  nvme-subsys1     nqn.2019-08.org.qemu:subsys0                                                                     nvme0, nvme1, nvme2
  nvme-subsys3     nqn.2019-08.org.qemu:qux                                                                         nvme3
  nvme-subsys4     nqn.2019-08.org.qemu:subsys1                                                                     nvme4

  NVM Express Controllers

  Device   SN                   MN                                       FR       TxPort Address        Subsystem    Namespaces
  -------- -------------------- ---------------------------------------- -------- ------ -------------- ------------ ----------------
  nvme0    foo                  QEMU NVMe Ctrl                           1.0      pcie   0000:00:06.0   nvme-subsys1 nvme1c0n1
  nvme1    bar                  QEMU NVMe Ctrl                           1.0      pcie   0000:00:07.0   nvme-subsys1 nvme1c1n1
  nvme2    baz                  QEMU NVMe Ctrl                           1.0      pcie   0000:00:08.0   nvme-subsys1 nvme1c2n1, nvme1c2n2
  nvme3    qux                  QEMU NVMe Ctrl                           1.0      pcie   0000:00:09.0   nvme-subsys3 nvme3n1
  nvme4    quux                 QEMU NVMe Ctrl                           1.0      pcie   0000:00:0a.0   nvme-subsys4 nvme4c4n1

  NVM Express Namespaces

  Device       NSID     Usage                      Format           Controllers
  ------------ -------- -------------------------- ---------------- ----------------
  nvme1n1      1        134.22  MB / 134.22  MB    512   B +  0 B   nvme0, nvme1, nvme2
  nvme1n2      2        268.44  MB / 268.44  MB    512   B +  0 B   nvme2
  nvme3n1      3        268.44  MB / 268.44  MB    512   B +  0 B   nvme3
  nvme4n1      1        268.44  MB / 268.44  MB    512   B +  0 B   nvme4

Thanks,

Since V4:
  - Code clean-up to snprintf rather than duplicating it and copy.
    (Keith)
  - Documentation for 'subsys' clean-up.  (Keith)
  - Remove 'cntlid' param from nvme_init_ctrl().  (Keith)
  - Put error_propagate() in nvme_realize().  (Keith)

Since RFC V3:
  - Exclude 'deatched' scheme from this series.  This will be covered in
    the next series by covering all the ns-related admin commands
    including ZNS and ns-mgmt. (Niklas)
  - Rebased on nvme-next.
  - Remove RFC tag from this V4.

Since RFC V2:
  - Rebased on nvme-next branch with trivial patches from the previous
    version(V2) applied. (Klaus)
  - Fix enumeration type name convention with NvmeIdNs prefix. (Klaus)
  - Put 'cntlid' to NvmeCtrl instance in nvme_init_ctrl() which was
    missed in V2.
  - Added 'detached' parameter to nvme-ns device to decide whether to
    attach or not to controller(s) in the subsystem. (Klaus)
  - Implemented Identify Active Namespace ID List aprt from Identify
    Allocated Namespace ID List by removing fall-thru statement.

Since RFC V1:
  - Updated namespace sharing scheme to be based on nvme-subsys
    hierarchy.

Minwoo Im (6):
  hw/block/nvme: introduce nvme-subsys device
  hw/block/nvme: support to map controller to a subsystem
  hw/block/nvme: add CMIC enum value for Identify Controller
  hw/block/nvme: support for multi-controller in subsystem
  hw/block/nvme: add NMIC enum value for Identify Namespace
  hw/block/nvme: support for shared namespace in subsystem

 hw/block/meson.build   |   2 +-
 hw/block/nvme-ns.c     |  23 +++++++--
 hw/block/nvme-ns.h     |   7 +++
 hw/block/nvme-subsys.c | 106 +++++++++++++++++++++++++++++++++++++++++
 hw/block/nvme-subsys.h |  32 +++++++++++++
 hw/block/nvme.c        |  72 +++++++++++++++++++++++++---
 hw/block/nvme.h        |   4 ++
 include/block/nvme.h   |   8 ++++
 8 files changed, 242 insertions(+), 12 deletions(-)
 create mode 100644 hw/block/nvme-subsys.c
 create mode 100644 hw/block/nvme-subsys.h

-- 
2.17.1