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From:   Alexander Duyck <alexander.duyck@gmail.com>
Date:   Tue, 27 Mar 2018 16:00:51 -0700
Message-ID: <CAKgT0Ude4C774sB22XG08-YoJ-4uSEB45b-RcM+eNnhyfuyQnw@mail.gmail.com>
Subject: Re: [pci PATCH v7 0/5] Add support for unmanaged SR-IOV
To:     Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Cc:     "Duyck, Alexander H" <alexander.h.duyck@intel.com>,
        virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org,
        Netdev <netdev@vger.kernel.org>,
        "Daly, Dan" <dan.daly@intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-nvme@lists.infradead.org,
        Keith Busch <keith.busch@intel.com>, netanel@amazon.com,
        Maximilian Heyne <mheyne@amazon.de>,
        "Wang, Liang-min" <liang-min.wang@intel.com>,
        "Rustad, Mark D" <mark.d.rustad@intel.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Christoph Hellwig <hch@lst.de>, dwmw@amazon.co.uk,
        Don Dutile <ddutile@redhat.com>
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Sender: linux-kernel-owner@vger.kernel.org
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On Fri, Mar 16, 2018 at 2:42 PM, Don Dutile <ddutile@redhat.com> wrote:
> On 03/15/2018 02:40 PM, Alexander Duyck wrote:
>>
>> This series is meant to add support for SR-IOV on devices when the VFs are
>> not managed by the kernel. Examples of recent patches attempting to do
>> this
>> include:
>> virto - https://patchwork.kernel.org/patch/10241225/
>> pci-stub - https://patchwork.kernel.org/patch/10109935/
>> vfio - https://patchwork.kernel.org/patch/10103353/
>> uio - https://patchwork.kernel.org/patch/9974031/
>>
>> Since this is quickly blowing up into a multi-driver problem it is
>> probably
>> best to implement this solution as generically as possible.
>>
>> This series is an attempt to do that. What we do with this patch set is
>> provide a generic framework to enable SR-IOV in the case that the PF
>> driver
>> doesn't support managing the VFs itself.
>>
>> I based my patch set originally on the patch by Mark Rustad but there
>> isn't
>> much left after going through and cleaning out the bits that were no
>> longer
>> needed, and after incorporating the feedback from David Miller. At this
>> point
>> the only items to be fully reused was his patch description which is now
>> present in patch 3 of the set.
>>
>> This solution is limited in scope to just adding support for devices that
>> provide no functionality for SR-IOV other than allocating the VFs by
>> calling pci_enable_sriov. Previous sets had included patches for VFIO, but
>> for now I am dropping that as the scope of that work is larger then I
>> think I can take on at this time.
>>
>> v2: Reduced scope back to just virtio_pci and vfio-pci
>>      Broke into 3 patch set from single patch
>>      Changed autoprobe behavior to always set when num_vfs is set non-zero
>> v3: Updated Documentation to clarify when sriov_unmanaged_autoprobe is
>> used
>>      Wrapped vfio_pci_sriov_configure to fix build errors w/o SR-IOV in
>> kernel
>> v4: Dropped vfio-pci patch
>>      Added ena and nvme to drivers now using pci_sriov_configure_unmanaged
>>      Dropped pci_disable_sriov call in virtio_pci to be consistent with
>> ena
>> v5: Dropped sriov_unmanaged_autoprobe and pci_sriov_conifgure_unmanaged
>>      Added new patch that enables pci_sriov_configure_simple
>>      Updated drivers to use pci_sriov_configure_simple
>> v6: Defined pci_sriov_configure_simple as NULL when SR-IOV is not enabled
>>      Updated drivers to drop "#ifdef" checks for IOV
>>      Added pci-pf-stub as place for PF-only drivers to add support
>> v7: Dropped pci_id table explanation from pci-pf-stub driver
>>      Updated pci_sriov_configure_simple to drop need for err value
>>      Fixed comment explaining why pci_sriov_configure_simple is NULL
>>
>> Cc: Mark Rustad <mark.d.rustad@intel.com>
>> Cc: Maximilian Heyne <mheyne@amazon.de>
>> Cc: Liang-Min Wang <liang-min.wang@intel.com>
>> Cc: David Woodhouse <dwmw@amazon.co.uk>
>>
>> ---
>>
>> Alexander Duyck (5):
>>        pci: Add pci_sriov_configure_simple for PFs that don't manage VF
>> resources
>>        virtio_pci: Add support for unmanaged SR-IOV on virtio_pci devices
>>        ena: Migrate over to unmanaged SR-IOV support
>>        nvme: Migrate over to unmanaged SR-IOV support
>>        pci-pf-stub: Add PF driver stub for PFs that function only to
>> enable VFs
>>
>>
>>   drivers/net/ethernet/amazon/ena/ena_netdev.c |   28 -------------
>>   drivers/nvme/host/pci.c                      |   20 ----------
>>   drivers/pci/Kconfig                          |   12 ++++++
>>   drivers/pci/Makefile                         |    2 +
>>   drivers/pci/iov.c                            |   31 +++++++++++++++
>>   drivers/pci/pci-pf-stub.c                    |   54
>> ++++++++++++++++++++++++++
>>   drivers/virtio/virtio_pci_common.c           |    1
>>   include/linux/pci.h                          |    3 +
>>   include/linux/pci_ids.h                      |    2 +
>>   9 files changed, 107 insertions(+), 46 deletions(-)
>>   create mode 100644 drivers/pci/pci-pf-stub.c
>>
>> --
>>
> For what it's worth.
>
> Good, simpler start for this type of support/effort.
> Thanks for the multiple versions to get to this point.
>
> Reviewed-by: Donald Dutile <ddutile@redhat.com>

Any issues with getting this pulled into the linux-pci tree? When I
submitted these that was the original target for this set, or do I
need to look at breaking them up and/or submitting them submitted
somewhere else?

Thanks.

- Alex