Re: [virtio-comment] [PATCH] virtio-net: Add support for the flexible driver notification

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jan 30, 2020 at 12:49:38PM +0000, Vitaly Mireyno wrote:
> 
> >-----Original Message-----
> >From: Michael S. Tsirkin <mst@redhat.com>
> >Sent: Wednesday, 29 January, 2020 11:58
> >To: Vitaly Mireyno <vmireyno@marvell.com>
> >Cc: Stefan Hajnoczi <stefanha@redhat.com>; virtio-comment@lists.oasis-
> >open.org; Jason Wang <jasowang@redhat.com>
> >Subject: [EXT] Re: [virtio-comment] [PATCH] virtio-net: Add support for the
> >flexible driver notification
> >
> >On Tue, Jan 28, 2020 at 02:33:27PM +0000, Vitaly Mireyno wrote:
> >>
> >> >-----Original Message-----
> >> >From: virtio-comment@lists.oasis-open.org
> >> ><virtio-comment@lists.oasis- open.org> On Behalf Of Michael S.
> >> >Tsirkin
> >> >Sent: Monday, 27 January, 2020 20:48
> >> >To: Vitaly Mireyno <vmireyno@marvell.com>
> >> >Cc: Stefan Hajnoczi <stefanha@redhat.com>;
> >> >virtio-comment@lists.oasis- open.org; Jason Wang
> >> ><jasowang@redhat.com>
> >> >Subject: [EXT] Re: [virtio-comment] [PATCH] virtio-net: Add support
> >> >for the flexible driver notification
> >> >
> >> >On Mon, Jan 27, 2020 at 05:00:03PM +0000, Vitaly Mireyno wrote:
> >> >>
> >> >> >-----Original Message-----
> >> >> >From: Michael S. Tsirkin <mst@redhat.com>
> >> >> >Sent: Monday, 27 January, 2020 17:34
> >> >> >To: Vitaly Mireyno <vmireyno@marvell.com>
> >> >> >Cc: Stefan Hajnoczi <stefanha@redhat.com>;
> >> >> >virtio-comment@lists.oasis- open.org; Jason Wang
> >> >> ><jasowang@redhat.com>
> >> >> >Subject: [EXT] Re: [virtio-comment] [PATCH] virtio-net: Add
> >> >> >support for the flexible driver notification
> >> >> >
> >> >> >On Mon, Jan 27, 2020 at 12:49:48PM +0000, Vitaly Mireyno wrote:
> >> >> >>
> >> >> >> >-----Original Message-----
> >> >> >> >From: Stefan Hajnoczi <stefanha@redhat.com>
> >> >> >> >Sent: Monday, 27 January, 2020 11:50
> >> >> >> >To: Vitaly Mireyno <vmireyno@marvell.com>
> >> >> >> >Cc: virtio-comment@lists.oasis-open.org; Michael S. Tsirkin
> >> >> >> ><mst@redhat.com>; Jason Wang <jasowang@redhat.com>
> >> >> >> >Subject: [EXT] Re: [virtio-comment] [PATCH] virtio-net: Add
> >> >> >> >support for the flexible driver notification
> >> >> >> >
> >> >> >> >On Sun, Jan 26, 2020 at 12:10:28PM +0000, Vitaly Mireyno wrote:
> >> >> >> >> Currently, the driver notification (available buffer
> >> >> >> >> notification) has a fixed
> >> >> >> >structure.
> >> >> >> >> If VIRTIO_F_NOTIFICATION_DATA has been negotiated, it
> >includes:
> >> >> >> >> vqn,
> >> >> >> >next_off and next_wrap.
> >> >> >> >> If notify_off_multiplier > 0, the VQ number can be derived by
> >> >> >> >> the device
> >> >> >> >from the Queue Notify address, so vqn may be redundant.
> >> >> >> >>
> >> >> >> >> Some devices benefit from receiving an additional data with
> >> >> >> >> driver
> >> >> >> >notifications (because of the specific hardware implementation).
> >> >> >> >This data can optionally replace the vqn field in the driver
> >> >> >> >notification
> >> >structure.
> >> >> >> >> In its simplest form, it would be sufficient for this data to
> >> >> >> >> be a per-device
> >> >> >> >constant value.
> >> >> >> >>
> >> >> >> >>
> >> >> >> >> Signed-off-by: Vitaly Mireyno <vmireyno@marvell.com>
> >> >> >> >> ---
> >> >> >> >>  content.tex | 24 ++++++++++++++++++++++++
> >> >> >> >>  1 file changed, 24 insertions(+)
> >> >> >> >
> >> >> >> >Hi Vitaly,
> >> >> >> >Can you give a concrete example of how devices can use this
> >feature?
> >> >> >> >
> >> >> >> >The reason I'm a little unsure is that the PCI capability only
> >> >> >> >provides a single notify_data value per device.  That same
> >> >> >> >value is then passed back to the device in the notify write.
> >> >> >> >
> >> >> >> >If there is just a single constant value per device, why is it
> >> >> >> >necessary to involve the driver at all?  Doesn't the device
> >> >> >> >already know its own magic value and it doesn't really need the
> >> >> >> >driver to pass the
> >> >> >value back to it?
> >> >> >> >
> >> >> >> >Stefan
> >> >> >> >
> >> >> >>
> >> >> >> This will help HW devices that share the same memory space
> >> >> >> between
> >> >> >virtqueue notifications and other types of notifications. The
> >> >> >virtio driver will always use the value that will tell the HW that
> >> >> >it's a virtqueue
> >> >notification.
> >> >> >> Of course, the feature can be extended, such that there will be
> >> >> >> a value
> >> >> >configurable per virtqueue (which is a generalization of the vqn
> >> >> >field). I just didn't want to complicate it further, without a
> >> >> >real-life
> >> >justification.
> >> >> >
> >> >> >I would like to see a bit more detail about these other types of
> >> >> >notifications then.
> >> >> >
> >> >>
> >> >> Other notification types could be control-plane notifications, for
> >> >> example
> >> >adding MAC/VLAN filter. These types of notifications will not be sent
> >> >by the virtio driver, but rather by a vendor driver in the vDPA framework.
> >> >> Another example is offloaded RDMA notifications.
> >> >> The thing is that the HW doesn't have a "mode" configuration that
> >> >> can
> >> >distinguish between virtio and other modes. The HW only reacts to the
> >> >notification data, which is expected to include all the relevant information.
> >> >
> >> >If it's control plane, isn't the natural way to do this is by mapping
> >> >a separate range of addresses though?
> >> >
> >> >It might be a good idea to add extra data in the notifications but
> >> >wasting these bits on control plane things seems like a weird design choice.
> >> >
> >>
> >> You are right, but the control plane is only an example. It's mainly
> >> designed to be used for other offloaded protocols data plane
> >> notifications, and since the HW infrastructure is already there, the
> >> control plane may as well use it.
> >
> >OK so I wonder what are some other examples? And are these well served by
> >a static key in this field?
> >
> 
> I'm assuming the question is "what are some other examples of use-cases that could utilize this new feature".
> Actually, from the driver POV it's a per-device value, but from HW POV it's a per notification type value. When working with CNA, different protocol drivers (virtio-net/RoCE/iSCSI/...) can use different values, such that the HW could differentiate between notification types.
> I'm only aware of this real-life use-case where a per-device value is sufficient.

I can only assume different protocols use different VQs.
Isn't that right?


> >> Sharing the same address range
> >> helps reducing the PCI BAR size.
> >
> >OTOH is there a need to have this per VQ? 
> 
> At the moment I don't see an actual need, but the feature can definitely be extended such that the extra data will be configurable per vq, if that makes more sense.
> 
> >Can't control plane things just use a
> >single config space register? This way there's no real increase in the BAR size.
> >
> 
> What contributes to the BAR size are offloaded protocols (in CNA), if there were no memory space sharing. A control plane could potentially use a config space.

OK so the point is that you want to have multiple VQ #s of what appears
to guest as different devices, shared at the same address?
The super/hypervisor can then no longer limit driver access to
a specific protocol ...
Wouldn't that be a security problem?

> 
> >> >
> >> >> >
> >> >> >>
> >> >> >> >> diff --git a/content.tex b/content.tex index 06bb4ca..265dc12
> >> >> >> >> 100644
> >> >> >> >> --- a/content.tex
> >> >> >> >> +++ b/content.tex
> >> >> >> >> @@ -965,6 +965,9 @@ \subsubsection{Notification structure
> >> >> >> >> layout}\label{sec:Virtio Transport Options  struct
> >> >> >> >> virtio_pci_notify_cap
> >> >{
> >> >> >> >>          struct virtio_pci_cap cap;
> >> >> >> >>          le32 notify_off_multiplier; /* Multiplier for
> >> >> >> >> queue_notify_off. */
> >> >> >> >> +        le16 notify_data; /* The data to be placed in the vqn field */
> >> >> >> >> +        u8 notify_data_valid;
> >> >> >> >> +        u8 padding; /* Pad to a dword */
> >> >> >> >>  };
> >> >> >> >>  \end{lstlisting}
> >> >> >> >>
> >> >> >> >> @@ -984,6 +987,9 @@ \subsubsection{Notification structure
> >> >> >> >> layout}\label{sec:Virtio Transport Options  the same Queue
> >> >> >> >> Notify address
> >> >> >> >for all queues.
> >> >> >> >>  \end{note}
> >> >> >> >>
> >> >> >> >> +If \field{notify_data_valid} != 0, the driver will set the
> >> >> >> >> +\field{vqn} field in the available buffer notification
> >> >> >> >> +structure to the
> >> >> >> >\field{notify_data} value.
> >> >> >> >> +
> >> >> >> >>  \devicenormative{\paragraph}{Notification capability}{Virtio
> >> >> >> >> Transport Options / Virtio Over PCI Bus / PCI Device Layout /
> >> >> >> >> Notification
> >> >> >> >capability}  The device MUST present at least one notification
> >capability.
> >> >> >> >>
> >> >> >> >> @@ -1020,6 +1026,12 @@ \subsubsection{Notification structure
> >> >> >> >> layout}\label{sec:Virtio Transport Options  cap.length >=
> >> >> >> >> queue_notify_off * notify_off_multiplier + 4
> >> >> >> >> \end{lstlisting}
> >> >> >> >>
> >> >> >> >> +The device MAY set \field{notify_data_valid} to any non-zero
> >> >> >> >> +value, to request the driver to set the \field{vqn} to the
> >> >> >\field{notify_data} value.
> >> >> >> >> +If the device sets \field{notify_data_valid} to a non-zero
> >> >> >> >> +value, it MUST set \field{notify_data} to a valid value.
> >> >> >> >> +For a normal operation, the device MUST set
> >> >> >> >> +\field{notify_data_valid} to
> >> >> >> >zero.
> >> >> >> >> +
> >> >> >> >>  \subsubsection{ISR status capability}\label{sec:Virtio
> >> >> >> >> Transport Options / Virtio Over PCI Bus / PCI Device Layout /
> >> >> >> >> ISR status capability}
> >> >> >> >>
> >> >> >> >>  The VIRTIO_PCI_CAP_ISR_CFG capability @@ -1519,6 +1531,18
> >@@
> >> >> >> >> \subsubsection{Available Buffer
> >> >> >> >> Notifications}\label{sec:Virtio Transport Option  See
> >> >> >> >> \ref{sec:Virtio Transport Options / Virtio Over PCI Bus / PCI
> >> >> >> >> Device Layout / Notification capability}  for how to
> >> >> >> >> calculate the
> >> >> >> >Queue Notify address.
> >> >> >> >>
> >> >> >> >> +\drivernormative{\paragraph}{Available Buffer
> >> >> >> >> +Notifications}{Virtio Transport Options / Virtio Over PCI
> >> >> >> >> +Bus / PCI-specific Initialization And Device Operation /
> >> >> >> >> +Available Buffer Notifications} If
> >> >> >> >> +VIRTIO_F_NOTIFICATION_DATA has been negotiated, and if
> >> >> >> >\field{notify_data_valid} != 0, the driver MUST set the
> >> >> >> >\field{vqn} field of the available buffer notification
> >> >> >> >structure to the \field{notify_data}
> >> >> >value.
> >> >> >> >> +
> >> >> >> >> +\begin{note}
> >> >> >> >> +If \field{notify_off_multiplier} > 0, the virtqueue number
> >> >> >> >> +can potentially be derived by the device from the Queue
> >> >> >> >> +Notify address, so \field{vqn} may be redundant. Some
> >> >> >> >> +devices benefit from receiving the additional data with
> >> >> >> >> +driver notifications (because of the specific
> >> >> >> >hardware implementation).
> >> >> >> >> +\end{note}
> >> >> >> >> +
> >> >> >> >>  \subsubsection{Used Buffer Notifications}\label{sec:Virtio
> >> >> >> >> Transport Options / Virtio Over PCI Bus / PCI-specific
> >> >> >> >> Initialization And Device Operation / Used Buffer
> >> >> >> >> Notifications}
> >> >> >> >>
> >> >> >> >>  If a used buffer notification is necessary for a virtqueue,
> >> >> >> >> the device would
> >> >> >> >typically act as follows:
> >> >> >> >> --
> >> >> >> >>
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> >gFRdce
> >> vq01tbLQAw4A_NO7xgI&m=-ca-jbl8A3jTCd4B2nRvY1lcYoN7hO-
> >3Wcgha7UVPjM&s=d-
> >> 5RFJqLHtXwDiC7gsP173FnK5C9R0RMUwfgIRPczK0&e=