linux-kernel - Re: [PATCH v2 3/3] net: mana: Allocate MSI-X vectors dynamically as required

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Message-ID: <aA-Evojnzt2z0RdH@yury>
Date: Mon, 28 Apr 2025 09:38:06 -0400
From: Yury Norov <yury.norov@...il.com>
To: Shradha Gupta <shradhagupta@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nipun Gupta <nipun.gupta@....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 Wilczyński <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>,
	Simon Horman <horms@...nel.org>, 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 v2 3/3] net: mana: Allocate MSI-X vectors dynamically as
 required

On Fri, Apr 25, 2025 at 03:54:38AM -0700, Shradha Gupta wrote:
> Currently, the MANA driver allocates MSI-X vectors statically based on
> MANA_MAX_NUM_QUEUES and num_online_cpus() values and in some cases ends
> up allocating more vectors than it needs. This is because, by this time
> we do not have a HW channel and do not know how many IRQs should be
> allocated.
> 
> To avoid this, we allocate 1 MSI-X vector during the creation of HWC and
> after getting the value supported by hardware, dynamically add the
> remaining MSI-X vectors.
> 
> Signed-off-by: Shradha Gupta <shradhagupta@...ux.microsoft.com>
> Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
> ---
>  Changes in v2:
>  * Use string 'MSI-X vectors' instead of 'pci vectors'
>  * make skip-cpu a bool instead of int
>  * rearrange the comment arout skip_cpu variable appropriately
>  * update the capability bit for driver indicating dynamic IRQ allocation
>  * enforced max line length to 80
>  * enforced RCT convention
>  * initialized gic to NULL, for when there is a possibility of gic
>    not being populated correctly
> ---
>  .../net/ethernet/microsoft/mana/gdma_main.c   | 323 ++++++++++++++----
>  include/net/mana/gdma.h                       |  11 +-
>  2 files changed, 269 insertions(+), 65 deletions(-)

To me, this patch looks too big, and it doesn't look like it does
exactly one thing.

Can you split it to a few small more reviewable chunks? For example,
I authored irq_setup() helper. If you split its rework and make it
a small preparation patch, I'll be able to add my review tag.

Thanks,
Yury