[PATCH v3 0/4] Allow dyn MSI-X vector allocation of MANA

Shradha Gupta
2025-05-09T10:12:49Z

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 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 fourth 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.

---
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 alloc
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

.../net/ethernet/microsoft/mana/gdma_main.c | 264 +++++++++++++++---
drivers/pci/controller/pci-hyperv.c | 7 +-
drivers/pci/msi/irqdomain.c | 5 +-
include/linux/msi.h | 2 +
include/net/mana/gdma.h | 8 +-
5 files changed, 235 insertions(+), 51 deletions(-)

--
2.34.1