Allow dyn MSI-X vector allocation of MANA

From:		Shradha Gupta <shradhagupta-AT-linux.microsoft.com>
To:
Subject:		[PATCH v3 0/4] Allow dyn MSI-X vector allocation of MANA
Date:		Fri, 09 May 2025 03:12:46 -0700
Message-ID:		<1746785566-4337-1-git-send-email-shradhagupta@linux.microsoft.com>
Cc:		Shradha Gupta <shradhagupta-AT-linux.microsoft.com>, linux-hyperv-AT-vger.kernel.org, linux-pci-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, Nipun Gupta <nipun.gupta-AT-amd.com>, Yury Norov <yury.norov-AT-gmail.com>, Jason Gunthorpe <jgg-AT-ziepe.ca>, Jonathan Cameron <Jonathan.Cameron-AT-huwei.com>, Anna-Maria Behnsen <anna-maria-AT-linutronix.de>, Kevin Tian <kevin.tian-AT-intel.com>, Long Li <longli-AT-microsoft.com>, Thomas Gleixner <tglx-AT-linutronix.de>, Bjorn Helgaas <bhelgaas-AT-google.com>, Rob Herring <robh-AT-kernel.org>, Manivannan Sadhasivam <manivannan.sadhasivam-AT-linaro.org>, Krzysztof Wilczy�~Dski <kw-AT-linux.com>, Lorenzo Pieralisi <lpieralisi-AT-kernel.org>, Dexuan Cui <decui-AT-microsoft.com>, Wei Liu <wei.liu-AT-kernel.org>, Haiyang Zhang <haiyangz-AT-microsoft.com>, "K. Y. Srinivasan" <kys-AT-microsoft.com>, Andrew Lunn <andrew+netdev-AT-lunn.ch>, "David S. Miller" <davem-AT-davemloft.net>, Eric Dumazet <edumazet-AT-google.com>, Jakub Kicinski <kuba-AT-kernel.org>, Paolo Abeni <pabeni-AT-redhat.com>, Konstantin Taranov <kotaranov-AT-microsoft.com>, Simon Horman <horms-AT-kernel.org>, Leon Romanovsky <leon-AT-kernel.org>, Maxim Levitsky <mlevitsk-AT-redhat.com>, Erni Sri Satya Vennela <ernis-AT-linux.microsoft.com>, Peter Zijlstra <peterz-AT-infradead.org>, netdev-AT-vger.kernel.org, linux-rdma-AT-vger.kernel.org, Paul Rosswurm <paulros-AT-microsoft.com>, Shradha Gupta <shradhagupta-AT-microsoft.com>
Archive-link:		Article

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(-)

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2.34.1