linux-kernel - Re: [PATCH v4 0/5] Allow dyn MSI-X vector allocation of MANA

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Message-ID: <20250603041556.GA7800@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Mon, 2 Jun 2025 21:15:56 -0700
From: Shradha Gupta <shradhagupta@...ux.microsoft.com>
To: Simon Horman <horms@...nel.org>
Cc: linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nipun Gupta <nipun.gupta@....com>,
	Yury Norov <yury.norov@...il.com>, Jason Gunthorpe <jgg@...pe.ca>,
	Jonathan Cameron <Jonathan.Cameron@...ei.com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Kevin Tian <kevin.tian@...el.com>, Long Li <longli@...rosoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Krzysztof Wilczy???~Dski <kw@...ux.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Dexuan Cui <decui@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Konstantin Taranov <kotaranov@...rosoft.com>,
	Leon Romanovsky <leon@...nel.org>,
	Maxim Levitsky <mlevitsk@...hat.com>,
	Erni Sri Satya Vennela <ernis@...ux.microsoft.com>,
	Peter Zijlstra <peterz@...radead.org>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, Paul Rosswurm <paulros@...rosoft.com>,
	Shradha Gupta <shradhagupta@...rosoft.com>
Subject: Re: [PATCH v4 0/5] Allow dyn MSI-X vector allocation of MANA

On Fri, May 30, 2025 at 07:07:32PM +0100, Simon Horman wrote:
> On Thu, May 29, 2025 at 06:28:45AM -0700, Shradha Gupta wrote:
> > On Wed, May 28, 2025 at 07:55:08PM +0100, Simon Horman wrote:
> > > On Tue, May 27, 2025 at 08:57:33AM -0700, Shradha Gupta wrote:
> > > > 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.
> > > 
> > > Hi Shradha,
> > > 
> > > It's unclear what the target tree for this patch-set is.
> > > But if it is net-next, which seems likely given the code under
> > > drivers/net/, then:
> > > 
> > > Please include that target in the subject of each patch in the patch-set.
> > > 
> > > 	Subject: [PATCH v5 net-next 0/5] ...
> > > 
> > > And, moreover, ...
> > > 
> > > ## Form letter - net-next-closed
> > > 
> > > The merge window for v6.16 has begun and therefore net-next is closed
> > > for new drivers, features, code refactoring and optimizations. We are
> > > currently accepting bug fixes only.
> > > 
> > > Please repost when net-next reopens after June 8th.
> > > 
> > > RFC patches sent for review only are obviously welcome at any time.
> > 
> > Thank you Simon.
> > 
> > While posting this patchset I was a bit confused about what should be
> > the target tree. That's why in the cover letter of the V1 for this
> > series, I had requested more clarity on the same (since there are patches
> > from PCI and net-next both).
> > 
> > In such cases how do we decide which tree to target?
> 
> Yes, that isn't entirely clear to me either.
> Hopefully the maintainers can negotiate this.
>

Thanks Simon. also since teh target tree is not entirely clear, can I
still send out an updated version with suggested changes?
 
> > 
> > Also, noted about the next merge window for net-next :-)
> > 
> > Regards,
> > Shradha.
> >