This series moves EQ ownership from the shared mana_context to per-vPort mana_port_context, enabling each vPort to have dedicated MSI-X vectors when the hardware provides enough vectors. When vectors are limited, the driver falls back to sharing MSI-X among vPorts.
The series introduces a GDMA IRQ Context (GIC) abstraction with reference counting to manage interrupt context lifecycle. This allows both Ethernet and RDMA EQs to dynamically acquire dedicated or shared MSI-X vectors at vPort creation time rather than pre-allocating all vectors at probe time. This series touches both the net and RDMA MANA drivers and is intended to go through the net-next tree. The patches are available on a shared branch for both netdev and RDMA maintainers to review. The following changes since commit 73d587ae684d176fac9db94173f77d78a794ea4f: net: ethtool: fix missing closing paren in rings_reply_size() (2026-05-11 18:42:25 -0700) are available in the Git repository at: https://github.com/longlimsft/linux.git tags/mana-eq-msi-v9 for you to fetch changes up to 8249f52c3a065d92d24f27ab12c0b4d197ba14c4: RDMA/mana_ib: Allocate interrupt contexts on EQs Changes in v9: - RSS QPs now take a vport reference via pd->vport_use_count to ensure EQs outlive all QP consumers. EQs are only destroyed when the last QP (raw or RSS) on the PD releases its reference (patch 1) - Serialize mana_set_channels() against RDMA vport configuration via apc->vport_mutex when the port is down. When the port is up, Ethernet owns the vport exclusively so no locking is needed (patch 1) - Change WARN_ON(apc->eqs) to bail out with -EEXIST to prevent leaking prior EQ array if invariant is violated (patch 1) - Only commit pd->tx_shortform_allowed and pd->tx_vp_offset after mana_create_eq() succeeds (patch 1) - Reset gc->msi_sharing at the top of mana_gd_query_max_resources() so it is recomputed from current hardware state on resume (patch 2) - Fix reverse Christmas tree variable declaration ordering (patches 1, 3, 5) Changes in v8: - Fix comment to reference per-vPort queue count instead of gc->max_num_queues (patch 2) - Remove duplicate irq_update_affinity_hint() calls from error paths and mana_gd_remove_irqs(); the clearing is now centralized in mana_gd_put_gic() (patch 4) - Note the IRQ name change (mana_q -> mana_msi) in the commit message (patch 4) - Remove dead conditional write to spec.eq.msix_index (patch 5) - Document GIC ownership contract and msix_index invariant change in commit message (patch 5) - Populate eq.irq on RDMA EQs for consistency with the Ethernet path (patch 6) - Document BIT(6) relocation and capability flag semantics in commit message (patch 6) - Fix checkpatch --strict alignment and line length warnings Changes in v7: - 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 (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) - Guard ibdev_dbg() in mana_ib_cfg_vport() with error check so the vport handle is not logged on the failure path (patch 1) - Use cached gic->irq instead of pci_irq_vector() lookup in mana_gd_put_gic() for consistency with the allocation path (patch 3) - Fix unsigned int* to int* pointer type mismatch when calling mana_gd_get_gic() by using a local int variable for the MSI index (patches 5, 6) 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 | 67 +++- drivers/infiniband/hw/mana/qp.c | 37 +- .../net/ethernet/microsoft/mana/gdma_main.c | 323 +++++++++++++----- drivers/net/ethernet/microsoft/mana/mana_en.c | 170 +++++---- .../ethernet/microsoft/mana/mana_ethtool.c | 27 +- include/net/mana/gdma.h | 33 +- include/net/mana/mana.h | 7 +- 7 files changed, 488 insertions(+), 176 deletions(-) -- 2.43.0
