netdev - Re: [PATCH mlx5-next v6 1/4] PCI: Add sysfs callback to allow MSI-X table size change of SR-IOV VFs

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Message-ID: <20210220190600.GA1260870@bjorn-Precision-5520>
Date:   Sat, 20 Feb 2021 13:06:00 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-pci@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        Don Dutile <ddutile@...hat.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Krzysztof Wilczyński <kw@...ux.com>
Subject: Re: [PATCH mlx5-next v6 1/4] PCI: Add sysfs callback to allow MSI-X
 table size change of SR-IOV VFs

On Fri, Feb 19, 2021 at 09:20:18AM +0100, Greg Kroah-Hartman wrote:

> Ok, can you step back and try to explain what problem you are trying to
> solve first, before getting bogged down in odd details?  I find it
> highly unlikely that this is something "unique", but I could be wrong as
> I do not understand what you are wanting to do here at all.

We want to add two new sysfs files:

  sriov_vf_total_msix, for PF devices
  sriov_vf_msix_count, for VF devices associated with the PF

AFAICT it is *acceptable* if they are both present always.  But it
would be *ideal* if they were only present when a driver that
implements the ->sriov_get_vf_total_msix() callback is bound to the
PF.