On Thu, Nov 24, 2022 at 3:12 PM Michael S. Tsirkin <[email protected]> wrote:
>
> On Thu, Nov 24, 2022 at 01:52:41PM +0800, Jason Wang wrote:
> > On Thu, Nov 24, 2022 at 5:08 AM Michael S. Tsirkin <[email protected]> wrote:
> > >
> > > This introduces a general structure for group administration commands,
> > > used to control device groups through their owner.
> > >
> > > Following patches will introduce specific commands and an interface for
> > > submitting these commands to the owner.
> > >
> > > Signed-off-by: Max Gurtovoy <[email protected]>
> > > Signed-off-by: Michael S. Tsirkin <[email protected]>
> > > ---
> > > admin.tex | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > > 1 file changed, 98 insertions(+)
> > >
> > > diff --git a/admin.tex b/admin.tex
> > > index 6ebdd05..1dca136 100644
> > > --- a/admin.tex
> > > +++ b/admin.tex
> > > @@ -42,4 +42,102 @@ \section{Device groups}\label{sec:Basic Facilities of
> > > a Virtio Device / Device g
> > > PCI transport (see \ref{sec:Virtio Transport Options / Virtio Over PCI
> > > Bus}).
> > > \end{description}
> > >
> > > +\subsection{Group administration commands}\label{sec:Basic Facilities of
> > > a Virtio Device / Device groups / Group administration commands}
> > >
> > > +Group administration commands can be issued through an owner
> > > +device to control member devices of a group. This mechanism can
> > > +be used, for example, to configure a member device before it is
> > > +initialized by its driver.
> >
> > This excludes any possible runtime configuration, is this intended?
>
> No idea - what kind of runtime configuration are you talking about?
> This explicitly says "to configure a member device" and that's
> certainly at runtime.
Not sure, but if we say something like we, it means we need a group of
commands to support runtime stuff in the future?
>
>
> >
> > > +
> > > +All the group administration commands are of the following form:
> > > +
> > > +\begin{lstlisting}
> > > +struct virtio_admin_cmd {
> > > + /* Device-readable part */
> > > + le16 opcode;
> > > + /*
> > > + * 1 - SR-IOV
> > > + * 2 - 65535 reserved
> > > + */
> > > + le16 group_type;
> > > + /* unused, reserved for future extensions */
> > > + u8 reserved1[12];
> > > + le64 group_member_id;
> > > + u8 command_specific_data[];
> > > +
> > > + /* Device-writable part */
> > > + le16 status;
> > > + le16 status_qualifier;
> > > + /* unused, reserved for future extensions */
> > > + u8 reserved2[4];
> > > + u8 command_specific_result[];
> > > +};
> > > +\end{lstlisting}
> > > +
> > > +For all commands, \field{opcode}, \field{group_type} and if
> > > +necessary \field{group_member_id} and \field{command_specific_data} are
> > > +set by the driver, and the owner device sets \field{status} and if
> > > +needed \field{status_qualifier} and
> > > +\field{command_specific_result}.
> > > +
> > > +As a rule, any unused device-readable fields are set to zero by the
> > > driver
> > > +and ignored by the device. Any unused device-writeable fields are set
> > > to zero
> > > +by the device and ignored by the driver.
> > > +
> > > +\field{opcode} specifies the command. The valid
> > > +values for \field{opcode} can be found in the following table:
> > > +
> > > +\begin{tabular}{|l|l|}
> > > +\hline
> > > +opcode & Name & Command Description \\
> > > +\hline \hline
> > > +0x0000 - 0x7FFF & - & Group administration commands \\
> > > +\hline
> > > +0x8000 - 0xFFFF & - & Reserved \\
> > > +\hline
> > > +\end{tabular}
> > > +
> > > +The \field{group_type} specifies the group type identifier.
> >
> > So this means there's no way for having a group specific adminq? E.g
> > one queue for SR-IOV and another for SIOV.
> >
> > > +The \field{group_member_id} specifies the member identifier within the
> > > group.
> > > +See section \ref{sec:Introduction / Terminology / Device group}
> > > +for the definition of the group type identifier and group member
> > > +identifier.
> > > +
> > > +The following table describes possible \field{status} values;
> > > +to simplify common implementations, they are intentionally
> > > +matching common Linux names and error numbers:
> >
> > I may miss something but I don't see how it matches Linux error numbers.
>
>
> include/uapi/asm-generic/errno-base.h:#define EINVAL 22 /*
> Invalid argument */
Ok, only this one was matched but any advantages of menting the
matching? I believe not all the error numbers are meaningful for a
device interface (e.g EINTR).
Thanks
>
>
> > Thanks
> >
> > > +
> > > +\begin{tabular}{|l|l|l|}
> > > +\hline
> > > +Status (decimal) & Name & Description \\
> > > +\hline \hline
> > > +00 & VIRTIO_ADMIN_STATUS_OK & successful completion \\
> > > +\hline
> > > +22 & VIRTIO_ADMIN_STATUS_EINVAL & invalid command \\
> > > +\hline
> > > +other & - & group administration command error \\
> > > +\hline
> > > +\end{tabular}
> > > +
> > > +When \field{status} is VIRTIO_ADMIN_STATUS_OK, \field{status_qialifier}
> > > +is reserved and set to zero by the device.
> > > +
> > > +When \field{status} is VIRTIO_ADMIN_STATUS_EINVAL,
> > > +the following table describes possible \field{status_qialifier} values:
> > > +\begin{tabular}{|l|l|l|}
> > > +\hline
> > > +Status & Name & Description \\
> > > +\hline \hline
> > > +0x00 & VIRTIO_ADMIN_STATUS_Q_INVALID_COMMAND & command error: no
> > > additional information \\
> > > +\hline
> > > +0x01 & VIRTIO_ADMIN_STATUS_Q_INVALID_OPCODE & unsupported or
> > > invalid \field{opcode} \\
> > > +\hline
> > > +0x02 & VIRTIO_ADMIN_STATUS_Q_INVALID_FIELD & unsupported or invalid
> > > field within \field{command_specific_data} \\
> > > +\hline
> > > +0x03 & VIRTIO_ADMIN_STATUS_Q_INVALID_GROUP & unsupported or invalid
> > > \field{group_type} \\
> > > +\hline
> > > +0x04 & VIRTIO_ADMIN_STATUS_Q_INVALID_MEM & unsupported or invalid
> > > \field{group_member_id} \\
> > > +\hline
> > > +0x05-0xFFFF & - & reserved for future use \\
> > > +\hline
> > > +\end{tabular}
> > > --
> > > MST
> > >
>
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