[PATCH net-next v7 0/6] net: mana: Per-vPort EQ and MSI-X interrupt management

[Long Li <longli@microsoft.com>]

This series adds per-vPort Event Queue (EQ) allocation and MSI-X interrupt
management for the MANA driver. Previously, all vPorts shared a single set
of EQs. This change enables dedicated EQs per vPort with support for both
dedicated and shared MSI-X vector allocation modes.

Patch 1 moves EQ ownership from mana_context to per-vPort mana_port_context
and exports create/destroy functions for the RDMA driver. Also adds EQ
create/destroy calls to mana_ib_cfg_vport/uncfg_vport so RDMA vPorts get
their own EQs.

Patch 2 adds device capability queries to determine whether MSI-X vectors
should be dedicated per-vPort or shared. When the number of available MSI-X
vectors is insufficient for dedicated allocation, the driver enables sharing
mode with bitmap-based vector assignment.

Patch 3 introduces the GIC (GDMA IRQ Context) abstraction with reference
counting, allowing multiple EQs to safely share a single MSI-X vector.

Patch 4 converts the global EQ allocation in probe/resume to use the new
GIC functions.

Patch 5 adds per-vPort GIC lifecycle management, calling get/put on each
EQ creation and destruction during vPort open/close.

Patch 6 extends the same GIC lifecycle management to the RDMA driver's EQ
allocation path.

Changes in v7:
- Rebased on net-next/main
- Patch 1: Guard ibdev_dbg() in mana_ib_cfg_vport() with error check so
  the vport handle is not logged on the failure path
- Patch 1: Fix checkpatch line length warning in debugfs_create_dir() call
- Patch 2: Use rounddown_pow_of_two() instead of roundup_pow_of_two() when
  computing per-vPort queue count to avoid unnecessarily forcing shared
  MSI-X mode in borderline configurations
- Patch 2: Call mana_gd_setup_remaining_irqs() unconditionally to ensure
  irq_contexts are populated in both dedicated and shared MSI-X modes,
  fixing bisectability between patches 2 and 5
- Patch 2: Fix checkpatch line length warning in debugfs_create_u16() call
- Patch 3: Use cached gic->irq instead of pci_irq_vector() lookup in
  mana_gd_put_gic() for consistency with the allocation path
- Patch 3: Fix checkpatch line length warning in mana_gd_get_gic()
  declaration
- Patch 5: Fix unsigned int* to int* pointer type mismatch when calling
  mana_gd_get_gic() by using a local int variable for the MSI index
- Patch 6: Fix same unsigned int* to int* pointer type mismatch in RDMA
  EQ creation path

Changes in v6:
- Rebased on net-next/main (v7.1-rc1)

Changes in v5:
- Rebased on net-next/main

Changes in v4:
- Rebased on net-next/main 7.0-rc4
- Patch 2: Use MANA_DEF_NUM_QUEUES instead of hardcoded 16 for
  max_num_queues clamping
- Patch 3: Track dyn_msix in GIC context instead of re-checking
  pci_msix_can_alloc_dyn() on each call; improved remove_irqs iteration
  to skip unallocated entries

Changes in v3:
- Rebased on net-next/main
- Patch 1: Added NULL check for mpc->eqs in mana_ib_create_qp_rss() to
  prevent NULL pointer dereference when RSS QP is created before a raw QP
  has configured the vport and allocated EQs

Changes in v2:
- Rebased on net-next/main (adapted to kzalloc_objs/kzalloc_obj macros,
  new GDMA_DRV_CAP_FLAG definitions)
- Patch 2: Fixed misleading comment for max_num_queues vs
  max_num_queues_vport in gdma.h
- Patch 3: Fixed spelling typo in gdma_main.c ("difference" -> "different")

Long Li (6):
  net: mana: Create separate EQs for each vPort
  net: mana: Query device capabilities and configure MSI-X sharing for
    EQs
  net: mana: Introduce GIC context with refcounting for interrupt
    management
  net: mana: Use GIC functions to allocate global EQs
  net: mana: Allocate interrupt context for each EQ when creating vPort
  RDMA/mana_ib: Allocate interrupt contexts on EQs

 drivers/infiniband/hw/mana/main.c             |  60 +++-
 drivers/infiniband/hw/mana/qp.c               |  16 +-
 .../net/ethernet/microsoft/mana/gdma_main.c   | 297 +++++++++++++-----
 drivers/net/ethernet/microsoft/mana/mana_en.c | 168 ++++++----
 include/net/mana/gdma.h                       |  33 +-
 include/net/mana/mana.h                       |   7 +-
 6 files changed, 425 insertions(+), 156 deletions(-)

-- 
2.43.0