[PATCH v6 0/5] Allow dyn MSI-X vector allocation of MANA

Shradha Gupta
2025-06-11T14:09:46Z

In this patchset we want to enable the MANA driver to be able to
allocate MSI-X vectors in PCI dynamically.

The first patch exports pci_msix_prepare_desc() in PCI to be able to
correctly prepare descriptors for dynamically added MSI-X vectors.

The second patch adds the support of dynamic vector allocation in
pci-hyperv PCI controller by enabling the MSI_FLAG_PCI_MSIX_ALLOC_DYN
flag and using the pci_msix_prepare_desc() exported in first patch.

The third patch adds a detailed description of the irq_setup(), to
help understand the function design better.

The fourth patch is a preparation patch for mana changes to support
dynamic IRQ allocation. It contains changes in irq_setup() to allow
skipping first sibling CPU sets, in case certain IRQs are already
affinitized to them.

The fifth patch has the changes in MANA driver to be able to allocate
MSI-X vectors dynamically. If the support does not exist it defaults to
older behavior.

Since this patchset has patches from PCI and net tree, I am not entirely
sure what should be the target tree. Any suggestions/recommendations on
the same are welcomed.

---
Changes in v6
* rebased to linux-next's v6.16-rc1 as per Jakub's suggestion
---
Changes in v5
* Added Yury as Author of the 3rd patch
* Fixed base commit information in the cover letter
* Correctly initialized start_irqs, so that it is cleaned properly
* rearranged the cpu_lock to minimize the critical section
---
Change in v4
* add a patch describing the functionality of irq_setup() through a
comment
* In irq_setup(), avoid using a label next_cpumask:
* modify the changes in MANA patch about restructuring the error
handling path in mana_gd_setup_dyn_irqs()
* modify the mana_gd_setup_irqs() to simplify handling around
start_irq_index
* add warning if an invalid gic is returned
* place the xa_destroy() cleanup in mana_gd_remove
---
Changes in v3
* split the 3rd patch into preparation patch around irq_setup() and
changes in mana driver to allow dynamic IRQ allocation
* Add arm64 support for dynamic MSI-X allocation in pci_hyperv
controller
---
Changes in v2
* split the first patch into two(exporting the preapre_desc
func and using the function and flag in pci-hyperv)
* replace 'pci vectors' by 'MSI-X vectors'
* Change the cover letter description to align with changes made
---

Shradha Gupta (4):
PCI/MSI: Export pci_msix_prepare_desc() for dynamic MSI-X allocations
PCI: hv: Allow dynamic MSI-X vector allocation
net: mana: Allow irq_setup() to skip cpus for affinity
net: mana: Allocate MSI-X vectors dynamically

Yury Norov (1):
net: mana: explain irq_setup() algorithm

.../net/ethernet/microsoft/mana/gdma_main.c | 366 ++++++++++++++----
drivers/pci/controller/pci-hyperv.c | 3 +-
drivers/pci/msi/irqdomain.c | 5 +-
include/linux/msi.h | 2 +
include/net/mana/gdma.h | 8 +-
5 files changed, 294 insertions(+), 90 deletions(-)

base-commit: 19a60293b9925080d97f22f122aca3fc46dadaf9
--
2.34.1