netdev - Re: [PATCH mlx5-next v7 0/4] Dynamically assign MSI-X vectors count

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Message-ID: <20210311232059.GR2356281@nvidia.com>
Date:   Thu, 11 Mar 2021 19:20:59 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Leon Romanovsky <leon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-rdma@...r.kernel.org, Netdev <netdev@...r.kernel.org>,
        Don Dutile <ddutile@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH mlx5-next v7 0/4] Dynamically assign MSI-X vectors count

On Thu, Mar 11, 2021 at 01:49:24PM -0800, Alexander Duyck wrote:
> > We don't need to invent new locks and new complexity for something
> > that is trivially solved already.
> 
> I am not wanting a new lock. What I am wanting is a way to mark the VF
> as being stale/offline while we are performing the update. With that
> we would be able to apply similar logic to any changes in the future.

I think we should hold off doing this until someone comes up with HW
that needs it. The response time here is microseconds, it is not worth
any complexity

Jason