Merge patch series "ibmvfc: NVMe/FC support over IBM Virtual FC"

Tyrel Datwyler <tyreld@linux.ibm.com> says:

This series adds NVMe/FC initiator support to the ibmvfc driver, enabling
IBM POWER virtual machines to discover and use NVMe namespaces presented by
the IBM Virtual I/O Server (VIOS) over the existing NPIV transport.

The ibmvfc driver communicates with the VIOS via a CRQ-based protocol. With
this series the VIOS can present both SCSI/FCP and NVMe/FC targets through
parallel sets of protocol-specific MAD opcodes, fabric login flows, and
sub-CRQ channels.

The series is organized into three phases:

Patches 1-5: Bug fixes and preparatory refactoring
  Four pre-existing bugs are fixed before any NVMe/FC work is introduced:
  a deadlock in the MAD send-failure path (locked done variant called with
  host_lock already held), a race during driver teardown where
  rport_add_work_q work items can outlive the FC host, a NULL event
  dereference in ibmvfc_tgt_implicit_logout_and_del, and an allocator
  mismatch where mempool-allocated ibmvfc_target structs are freed via kfree
  rather than mempool_free. Patch 5 moves the target list and count from
  struct ibmvfc_host into struct ibmvfc_channels as the structural
  prerequisite for independent per-protocol target tracking.

Patches 6-27: Protocol interface and driver scaffolding
  Patch 6 extends ibmvfc.h with NVMe/FC protocol definitions: MAD opcodes,
  capability flags, the v3 command layout, the fabric login MAD, async
  sub-CRQ event format, and updated channel enquiry/setup fields. Patch 7
  splits ibmvfc.c into ibmvfc-core.c and the new ibmvfc-nvme.c/h, registers
  an nvme_fc_port_template with stub callbacks, and adds NVMe module
  parameters. The remaining patches build the NVMe/FC plumbing: NVMe
  channel-group initialization, sub-CRQ lifecycle management, protocol-
  specific fabric login flow, target discovery, PLOGI/PRLI/query-target,
  implicit logout, move-login, protocol-driven target allocation, NVMe
  target deletion, state machine updates, and local/remote port registration
  with the NVMe-FC transport layer.

Patches 28-33: NVMe-FC LLDD callbacks and I/O path
  Implements the full nvme_fc_port_template: create_queue/delete_queue map
  NVMe controller queues to sub-CRQ handles; ls_req submits FC-LS frames via
  the ibmvfc passthru MAD; fcp_io builds and submits NVMe FCP commands via
  the NVMe sub-CRQ and completes them via nvme_fc_rcv_fcp_rsp(); ls_abort
  and fcp_abort cancel outstanding requests via NVMF cancel MADs. Patch 33
  extends the purge path to fail outstanding NVMe FCP and LS requests during
  host reset and link-down events.

Link: https://patch.msgid.link/20260723000149.969416-1-tyreld@linux.ibm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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