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Subject: [PATCH v6 2/5] Introduce admin command set
This command set is used for essential administrative and management operations. Admin commands should be submitted to a well defined management interface. Reviewed-by: Parav Pandit <parav@nvidia.com> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com> --- admin.tex | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++ content.tex | 2 ++ 2 files changed, 84 insertions(+) create mode 100644 admin.tex diff --git a/admin.tex b/admin.tex new file mode 100644 index 0000000..d14f8f7 --- /dev/null +++ b/admin.tex @@ -0,0 +1,82 @@ +\section{Administration command set}\label{sec:Basic Facilities of a Virtio Device / Administration command set} + +The Administration command set (also known as Admin command set) defines the commands that can be issued using a management interface. +This mechanism, for example, can be used by a system administrator that wants to configure a device before it is initialized by its driver. + +All the Admin commands are of the following form: + +\begin{lstlisting} +struct virtio_admin_cmd { + /* Device-readable part */ + le16 command; + /* + * 0 - Self + * 1 - SR-IOV + * 2 - 65535 are reserved + */ + le16 group_id; + le64 group_member_id; + /* reserved for common cmd fields */ + u8 reserved[12]; + u8 command_specific_data[]; + + /* Device-writable part */ + u8 status; + u8 command_specific_error; + 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 or invalid opcode \\ +\hline +03h & VIRTIO_ADMIN_STATUS_INVALID_FIELD & invalid field was set \\ +\hline +04h & VIRTIO_ADMIN_STATUS_INVALID_GROUP & invalid group identifier was set \\ +\hline +05h & VIRTIO_ADMIN_STATUS_INVALID_MEM & invalid group member identifier was set \\ +\hline +\end{tabular} + +The \field{command}, \field{group_id}, \field{group_member_id} 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. + +Reserved common fields are ignored by the device and to be zeroed by the driver. + +The mandatory fields to be set by the driver, for all admin commands, are the \field{command}, \field{group_id} and \field{group_member_id}. + +The optional unused fields to be zeroed by the driver. + +The \field{command} defines the opcode for the command. The value for each command can be found in each command section. + +The \field{group_id} defines the designated device group for the command. +The \field{group_member_id} defines the designated device within the device group for the command. +See section \ref{sec:Introduction / Terminology / Device group} for group identifier and group member identifier numbering for various device groups. + +The \field{command_specific_error} should be inspected by the driver only if \field{status} is set to +VIRTIO_ADMIN_STATUS_CS_ERR by the device. In this case, the content of \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 and should be ignored by the driver. + +The following table describes the Admin command set: + +\begin{tabular}{|l|l|} +\hline +Opcode & Command \\ +\hline \hline +0000h - 7FFFh & Generic admin cmds \\ +\hline +8000h - FFFFh & Reserved \\ +\hline +\end{tabular} diff --git a/content.tex b/content.tex index 7508dd1..caab298 100644 --- a/content.tex +++ b/content.tex @@ -449,6 +449,8 @@ \section{Exporting Objects}\label{sec:Basic Facilities of a Virtio Device / Expo types. It is RECOMMENDED that devices generate version 4 UUIDs as specified by \hyperref[intro:rfc4122]{[RFC4122]}. +\input{admin.tex} + \chapter{General Initialization And Device Operation}\label{sec:General Initialization And Device Operation} We start with an overview of device initialization, then expand on the -- 2.21.0
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