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

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Message-ID: <20210326172900.GA4611@redsun51.ssa.fujisawa.hgst.com>
Date:   Sat, 27 Mar 2021 02:29:00 +0900
From:   Keith Busch <kbusch@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Alexander Duyck <alexander.duyck@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saeed Mahameed <saeedm@...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 Fri, Mar 26, 2021 at 12:08:31PM -0500, Bjorn Helgaas wrote:
> I also want to resurrect your idea of associating
> "sriov_vf_msix_count" with the PF instead of the VF.  I really like
> that idea, and it better reflects the way both mlx5 and NVMe work.

That is a better match for nvme: we can assign resources to VFs with
the PF's "VF Enable" set to '0', so configuring VFs without requiring
them be enumerated in sysfs is a plus. The VFs would also implicitly be
in the "offline" state for that condition and able to accept these
requests.