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Subject: Re: [virtio-comment] [PATCH v2 1/4] Add virtio Admin Virtqueue
On 2/9/2022 4:45 AM, Jason Wang wrote:
å 2022/1/30 äå6:31, Max Gurtovoy åé:On 1/28/2022 5:18 AM, Jason Wang wrote:On Thu, Jan 27, 2022 at 10:47 PM Max Gurtovoy <mgurtovoy@nvidia.com> wrote:On 1/27/2022 3:03 PM, Jason Wang wrote:On Thu, Jan 27, 2022 at 6:25 PM Max Gurtovoy <mgurtovoy@nvidia.com> wrote:it's sufficient for VFs and this is the subject of the proposed commands.On 1/27/2022 5:14 AM, Jason Wang wrote:å 2022/1/24 äå5:39, Max Gurtovoy åé:In one of the many use cases a user wants to manipulate features andDo we need a way for advertising the supported optional commands (or features bits)? Otherwise dealing with the compatibility will resultconfiguration of the virtio devices regardless of the device type(net/block/console). Some of this configuration is generic enough. i.e Number of MSI-X vectors of a virtio PCI VF device. There is a need to dosuch features query and manipulation by its parent PCI PF.Currently virtio specification defines control virtqueue to manipulatefeatures and configuration of the device it operates on. However,control virtqueue commands are device type specific, which makes it verydifficult to extend for device agnostic commands.To support this requirement in elegant way, this patch introduces a new admin virtqueue. Admin virtqueue will use the same command format forall types of virtio devices.Manipulate features via admin virtqueue is asynchronous, scalable, easy to extend and doesn't require additional and expensive on-die resources to be allocated for every new feature that will be added in the future.Subsequent patches make use of this admin virtqueue. Reviewed-by: Parav Pandit <parav@nvidia.com> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com> ---ÂÂÂ admin-virtq.tex | 89 +++++++++++++++++++++++++++++++++++++++++++++++++ÂÂÂ content.texÂÂÂÂ |Â 9 +++-- ÂÂÂ 2 files changed, 96 insertions(+), 2 deletions(-) ÂÂÂ create mode 100644 admin-virtq.tex diff --git a/admin-virtq.tex b/admin-virtq.tex new file mode 100644 index 0000000..1a41c22 --- /dev/null +++ b/admin-virtq.tex @@ -0,0 +1,89 @@ +\section{Admin Virtqueues}\label{sec:Basic Facilities of a Virtio Device / Admin Virtqueues} ++Admin virtqueue is used to send administrative commands to manipulate +various features of the device and/or to manipulate various features, +if possible, of another device within the same group (e.g. PCI VFs of+a parent PCI PF device are grouped together. These devices can be+optionally managed by its parent PCI PF using its admin virtqueue.).+ +Use of Admin virtqueue is negotiated by the VIRTIO_F_ADMIN_VQ +feature bit. + +Admin virtqueue index may vary among different device types. ++Regardless of device offering VIRTIO_F_IN_ORDER, admin queue commandbuffers +are used by the device in out of order manner. ++The Admin command set defines the commands that may be issued onlyto the admin+virtqueue. Each virtio device that advertises the VIRTIO_F_ADMIN_VQfeature, MUST+support all the mandatory admin commands. A device MAY support alsoone or more +optional admin commands. All commands are of the following form:of per command probing.+ +\begin{lstlisting} +struct virtio_admin_cmd { +ÂÂÂÂÂÂÂ /* Device-readable part */ +ÂÂÂÂÂÂÂ u16 command;Two questions:1) It looks to me it's better to have a explicit device_id here otherthan embed it in each commandthis was already discussed.We agreed that some commands are not referring to different device sono, we don't need to put it in generic structure.I'm not against putting such id but we don't have an exact idea how willSF device_id will look like. Maybe it will be some 128 bit uuid ? maybe u64 ?How do you know u16 is sufficient for command?So VIRTIO_ADMIN_CAPS_IDENTIFY maps to 3 commands: VIRTIO_ADMIN_PCI_SRIOV_ATTRS, VIRTIO_ADMIN_PCI_VF_INTERRUPT_CONFIG_SET, VIRTIO_ADMIN_PCI_VF_INTERRUPT_CONFIG_GET Unless you do 1:1 mapping between cap bit and command, you will be short of commands if you're using u16.2^16 admin commands are more than enough.You introduce 65536 cap bits via identify. And you use u16 for command.But you map 3 commands to a single cap bit. You will be short of commands. Isn't it?
No we just don't use all the bits in the identify. Identify has 2^16 bits to be able to cover all we need.
When you'll add SF to virtio spec we'll create new commands for it withI don't think so, you can reserve a special device id for the PF itself.SF_id. Again, this was discussed with Parav in V1 and was close. Please don't re-open.can you propose something concrete ? are you sure by 100% that sf_id is 32 bit ? can the TG ack on that ?I meant for command without and destination. You can reserve a special ID for that.Regarding the bit, if you think 32bit is not sufficient, let's just use 64bit, or reserving some bytes in the command.
So 64bit size is acked by TG for vdev_id ?
You know it's you but not me that tries to propose this solution, right?ÂÂ how can we guess ?I'm proposing a solution but you ask questions that we answer but somehow they are asked again.2) virtio-net cvq use class/command which seems more elegant, e.g allcommands belongs to MSI could be grouped into the same classwhy can't we do it in u16 command opcode ?Where did you see I say you can't use u16?you suggest to replace it to class + command. I don't understand why. If it's not mandatory, please ack.Net cvq comes first, it's natural to ask why you do things differently.are you open for changes or should we copy/paste from net cvq ?I answered why. Admin command set has a different purpose.It's doesn't explain why class A + commands 1, 2 is better than opcodesLet's ask differently. Why we need class/command structure ? why is itmore elegant ?Don't you see my reply above? " commands belongs to MSI could be grouped into the same class "1 + 2 without a class.Well, if you read how cvq work it's not hard to get the conclusion,It's easier to be mapped to a feature bit. You just map a class and that's all.Otherwise, you need to feature X:Â command A,B,C,D ....But I just added one feature bit: the existence of the AQ. in your suggestion I'll need to add for each feature: Feature X can be negotiated only if AQ feature is negotiated.And if feature X will have a small extension so a new feature will be needed and it will say:Feature Y can be negotiated in feature X and feature AQ are negotiated. or if feature X and feature Y are mutual exclusive then: feature X can't be negotiated if feature Y is negotiated. feature X can be negotiated only if feature AQ is negotiated.This is how virtqueue works for all the existing device. It's as simple as depending the feature to another feature which indicates the existing of a specific type of virtqueue.
It is not simple and not scale.
and this is a small example. We will have more and more Admin functionality and this will be impossible to scale.A simple identify command solve this.+ u8 command_specific_data[]; + + /* Device-writable part */ + u8 status; + u8 command_specific_error;I wonder the reason why not using a single field for the above two fields. (Or any value for separating command specific error out, we don't do that for virtio-net cvq).each command have its own specific errors. virtio net cvq is not generic - it's a net device cvqueue.We're talking about the command format, not its semantics, right? It's command format is pretty general.in the Admin command set we would like to have better format that will allow users/drivers to better understand device error. It is very common in many HW devices and specs out there. I hope it doesn't critical for you as a concept.To make it generic we need to separate.+ u8 command_specific_result[]; +}; +\end{lstlisting} + +The following table describes the generic Admin status codes: + +\begin{tabular}{|l|l|l|} +\hline +Opcode & Status & Description \\ +\hline \hline +00h & VIRTIO_ADMIN_STATUS_OK & successful completion \\ +\hline+01h & VIRTIO_ADMIN_STATUS_CS_ERR & command specific error \\+\hline+02h & VIRTIO_ADMIN_STATUS_COMMAND_UNSUPPORTED & unsupported orinvalid opcode \\ +\hline +\end{tabular} + +The \field{command} and \field{command_specific_data} are +set by the driver, and the device sets the \field{status}, the+\field{command_specific_error} and the \field{command_specific_result},+if needed. ++The \field{command_specific_error} should be inspected by the driveronly if \field{status} is set to+VIRTIO_ADMIN_STATUS_CS_ERR by the device. In this case, the contentof \field{command_specific_error} +holds the command specific error. If \field{status} is not set to VIRTIO_ADMIN_STATUS_CS_ERR, the +\field{command_specific_error} value is undefined. + +The following table describes the Admin command set: + +\begin{tabular}{|l|l|l|} +\hline +Opcode & Command & M/O \\ +\hline \hline +0000h & VIRTIO_ADMIN_CAPS_IDENTIFY & M \\ +\hline +0001h - 7FFFh & Generic admin cmds & - \\ +\hline +8000h - FFFFh & Reserved & - \\ +\hline +\end{tabular}See above, I'd suggest to use class/command as virtio-net cvq.see my comment above.I answered above.Ok, so I see the identify command. But I wonder if we can do that via+ +\subsection{VIRTIO ADMIN CAPS IDENTIFY command}\label{sec:BasicFacilities of a Virtio Device / Admin Virtqueues / VIRTIO ADMIN CAPSIDENTIFY command} ++The VIRTIO_ADMIN_CAPS_IDENTIFY command has no command specific dataset by the driver. +This command upon success, returns a data buffer that describes information about the supported +admin capabilities by the device. This information is of form: +\begin{lstlisting} +struct virtio_admin_caps_identify_result { + /* + * caps[0] - Bit 0x0 - Bit 0x7 are reserved + * caps[1] - Bit 0x0 - Bit 0x7 are reserved + * caps[2] - Bit 0x0 - Bit 0x7 are reserved + * .... + * caps[8191] - Bit 0x0 - Bit 0x7 are reserved + */ + u8 caps[8192]; +};the feature bits?It doesn't scale. I tried it. It doesn't work.What prevents you from improving the scalability instead of trying to revinting a duplicated mechanism?It was already discussed. Spec doesn't scale, too many constrains between command-A,B,C and feature 44,45, 46 and for transport X, Y, Z.What I meant is, if you feel the current feature negotiation doesn't scale, you can improve it instead of reinventing it partially (e.g no negotiation) .We're adding an identify command for the admin command set. did you review it ?Yes, but what I meant is that we've already had a feature negotiation mechanism. We should improve it instead of reinventing another one.
I've explained the scale issue.
ThanksThanksThanksThanks.Thanks+\end{lstlisting} diff --git a/content.tex b/content.tex index 32de668..c524fab 100644 --- a/content.tex +++ b/content.tex@@ -99,10 +99,10 @@ \section{Feature Bits}\label{sec:Basic Facilitiesof a Virtio Device / Feature B ÂÂÂ \begin{description} ÂÂÂ \item[0 to 23] Feature bits for the specific device typeÂÂÂ -\item[24 to 40] Feature bits reserved for extensions to the queue and +\item[24 to 41] Feature bits reserved for extensions to the queue andÂÂÂÂÂ feature negotiation mechanismsÂÂÂ -\item[41 and above] Feature bits reserved for future extensions.+\item[42 and above] Feature bits reserved for future extensions. ÂÂÂ \end{description} ÂÂÂÂÂ \begin{note} @@ -449,6 +449,8 @@ \section{Exporting Objects}\label{sec:Basic Facilities of a Virtio Device / Expo ÂÂÂ types. It is RECOMMENDED that devices generate version 4 ÂÂÂ UUIDs as specified by \hyperref[intro:rfc4122]{[RFC4122]}. ÂÂÂ +\input{admin-virtq.tex} + ÂÂÂ \chapter{General Initialization And Device Operation}\label{sec:General Initialization And Device Operation}ÂÂÂÂÂ We start with an overview of device initialization, then expandon the @@ -6847,6 +6849,9 @@ \chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits} ÂÂÂÂÂ that the driver can reset a queue individually.ÂÂÂÂÂ See \ref{sec:Basic Facilities of a Virtio Device / Virtqueues /Virtqueue Reset}. ÂÂÂ +Â \item[VIRTIO_F_ADMIN_VQ (41)] This feature indicates that +Â the device supports administration virtqueue negotiation. + ÂÂÂ \end{description} ÂÂÂÂÂ \drivernormative{\section}{Reserved Feature Bits}{Reserved Feature Bits}This publicly archived list offers a means to provide input to the OASIS Virtual I/O Device (VIRTIO) TC. In order to verify user consent to the Feedback License terms and to minimize spam in the list archive, subscription is required before posting. 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