From: Bjorn Helgaas <helgaas@kernel.org>
To: Leon Romanovsky <leon@kernel.org>
Cc: Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Alex Williamson <alex.williamson@redhat.com>,
Bjorn Helgaas <bhelgaas@google.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org,
netdev@vger.kernel.org, Saeed Mahameed <saeedm@nvidia.com>,
Yishai Hadas <yishaih@nvidia.com>
Subject: Re: [PATCH mlx5-next 1/7] PCI/IOV: Provide internal VF index
Date: Fri, 24 Sep 2021 08:08:45 -0500 [thread overview]
Message-ID: <20210924130845.GA410176@bhelgaas> (raw)
In-Reply-To: <YUwgNPL++APsFJ49@unreal>
On Thu, Sep 23, 2021 at 09:35:32AM +0300, Leon Romanovsky wrote:
> On Wed, Sep 22, 2021 at 04:59:30PM -0500, Bjorn Helgaas wrote:
> > On Wed, Sep 22, 2021 at 01:38:50PM +0300, Leon Romanovsky wrote:
> > > From: Jason Gunthorpe <jgg@nvidia.com>
> > >
> > > The PCI core uses the VF index internally, often called the vf_id,
> > > during the setup of the VF, eg pci_iov_add_virtfn().
> > >
> > > This index is needed for device drivers that implement live migration
> > > for their internal operations that configure/control their VFs.
> > >
> > > Specifically, mlx5_vfio_pci driver that is introduced in coming patches
> > > from this series needs it and not the bus/device/function which is
> > > exposed today.
> > >
> > > Add pci_iov_vf_id() which computes the vf_id by reversing the math that
> > > was used to create the bus/device/function.
> > >
> > > Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
> > > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> > > Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
> >
> > Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> >
> > mlx5_core_sriov_set_msix_vec_count() looks like it does basically the
> > same thing as pci_iov_vf_id() by iterating through VFs until it finds
> > one with a matching devfn (although it *doesn't* check for a matching
> > bus number, which seems like a bug).
> >
> > Maybe that should use pci_iov_vf_id()?
>
> Yes, I gave same comment internally and we decided to simply reduce the
> amount of changes in mlx5_core to have less distractions and submit as a
> followup. Most likely will add this hunk in v1.
I guess it backfired as far as reducing distractions, because now it
just looks like a job half-done.
And it still looks like the existing code is buggy. This is called
via sysfs, so if the PF is on bus X and the user writes to
sriov_vf_msix_count for a VF on bus X+1, it looks like
mlx5_core_sriov_set_msix_vec_count() will set the count for the wrong
VF.
Bjorn
next prev parent reply other threads:[~2021-09-24 13:13 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1632305919.git.leonro@nvidia.com>
2021-09-22 10:38 ` [PATCH mlx5-next 1/7] PCI/IOV: Provide internal VF index Leon Romanovsky
2021-09-22 21:59 ` Bjorn Helgaas
2021-09-23 6:35 ` Leon Romanovsky
2021-09-24 13:08 ` Bjorn Helgaas [this message]
2021-09-25 10:10 ` Leon Romanovsky
2021-09-25 17:41 ` Bjorn Helgaas
2021-09-26 6:36 ` Leon Romanovsky
2021-09-26 20:23 ` Bjorn Helgaas
2021-09-27 11:55 ` Leon Romanovsky
2021-09-27 14:47 ` Bjorn Helgaas
2021-09-22 10:38 ` [PATCH mlx5-next 2/7] vfio: Add an API to check migration state transition validity Leon Romanovsky
2021-09-23 10:33 ` Shameerali Kolothum Thodi
2021-09-23 11:17 ` Leon Romanovsky
2021-09-23 13:55 ` Max Gurtovoy
2021-09-24 7:44 ` Shameerali Kolothum Thodi
2021-09-24 9:37 ` Kirti Wankhede
2021-09-26 9:09 ` Max Gurtovoy
2021-09-26 16:17 ` Shameerali Kolothum Thodi
2021-09-27 18:24 ` Max Gurtovoy
2021-09-27 18:29 ` Shameerali Kolothum Thodi
2021-09-27 22:46 ` Alex Williamson
2021-09-27 23:12 ` Jason Gunthorpe
2021-09-28 19:19 ` Alex Williamson
2021-09-28 19:35 ` Jason Gunthorpe
2021-09-28 20:18 ` Alex Williamson
2021-09-29 16:16 ` Jason Gunthorpe
2021-09-29 18:06 ` Alex Williamson
2021-09-29 18:26 ` Jason Gunthorpe
2021-09-29 10:57 ` Max Gurtovoy
2021-09-29 10:44 ` Max Gurtovoy
2021-09-29 12:35 ` Alex Williamson
2021-09-29 13:26 ` Max Gurtovoy
2021-09-29 13:50 ` Alex Williamson
2021-09-29 14:36 ` Max Gurtovoy
2021-09-29 15:17 ` Alex Williamson
2021-09-29 15:28 ` Max Gurtovoy
2021-09-29 16:14 ` Jason Gunthorpe
2021-09-29 21:48 ` Max Gurtovoy
2021-09-29 22:44 ` Alex Williamson
2021-09-30 9:25 ` Max Gurtovoy
2021-09-30 12:41 ` Alex Williamson
2021-09-29 23:21 ` Jason Gunthorpe
2021-09-30 9:34 ` Max Gurtovoy
2021-09-30 14:47 ` Jason Gunthorpe
2021-09-30 15:32 ` Max Gurtovoy
2021-09-30 16:24 ` Jason Gunthorpe
2021-09-30 16:51 ` Max Gurtovoy
2021-09-30 17:01 ` Jason Gunthorpe
2021-09-22 10:38 ` [PATCH mlx5-next 3/7] vfio/pci_core: Make the region->release() function optional Leon Romanovsky
2021-09-23 13:57 ` Max Gurtovoy
2021-09-22 10:38 ` [PATCH mlx5-next 4/7] net/mlx5: Introduce migration bits and structures Leon Romanovsky
2021-09-24 5:48 ` Mark Zhang
2021-09-22 10:38 ` [PATCH mlx5-next 5/7] net/mlx5: Expose APIs to get/put the mlx5 core device Leon Romanovsky
2021-09-22 10:38 ` [PATCH mlx5-next 6/7] mlx5_vfio_pci: Expose migration commands over mlx5 device Leon Romanovsky
2021-09-28 20:22 ` Alex Williamson
2021-09-29 5:36 ` Leon Romanovsky
2021-09-22 10:38 ` [PATCH mlx5-next 7/7] mlx5_vfio_pci: Implement vfio_pci driver for mlx5 devices Leon Romanovsky
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