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Subject: [PATCH] content: document speed, dupex
Document as used by Linux. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- content.tex | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/content.tex b/content.tex index bff80d0..e89ae44 100644 --- a/content.tex +++ b/content.tex @@ -2951,12 +2951,29 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device VIRTIO_NET_F_MTU is set. This field specifies the maximum MTU for the driver to use. +The following two fields, \field{speed} and \field{duplex} only +exist if VIRTIO_NET_F_SPEED_DUPLEX is set. + +\field{speed} is the device speed, in units of 1MByte, 0 to +0x7FFFF. Driver MUST also treat any +other value as representing an unknown duplex state. + +\field{duplex} has the values of 0x00 for full duplex, 0x01 for +half duplex and 0xff for unknown. Driver MUST also treat any +other value as representing an unknown duplex state. + +Neither \field{speed} not \field{duplex} changes as long as +VIRTIO_NET_S_LINK_UP is set. + \begin{lstlisting} struct virtio_net_config { u8 mac[6]; le16 status; le16 max_virtqueue_pairs; le16 mtu; + le32 speed; + u8 duplex; + }; \end{lstlisting} @@ -2985,6 +3002,10 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device If the driver negotiates the VIRTIO_NET_F_STANDBY feature, the device MAY act as a standby device for a primary device with the same MAC address. +Device MUST NOT change the \field{speed} and \field{duplex} +fields as long as VIRTIO_NET_S_LINK_UP is set in the +\field{status}. + \drivernormative{\subsubsection}{Device configuration layout}{Device Types / Network Device / Device configuration layout} A driver SHOULD negotiate VIRTIO_NET_F_MAC if the device offers it. @@ -3009,6 +3030,10 @@ \subsection{Device configuration layout}\label{sec:Device Types / Network Device A driver SHOULD negotiate the VIRTIO_NET_F_STANDBY feature if the device offers it. +A driver MUST treat a value of \field{speed} above +0x000000007fffffff as well as a value of \field{duplex} not +matching 0x0 or 0x1 as an unknown value. + \subsubsection{Legacy Interface: Device configuration layout}\label{sec:Device Types / Network Device / Device configuration layout / Legacy Interface: Device configuration layout} \label{sec:Device Types / Block Device / Feature bits / Device configuration layout / Legacy Interface: Device configuration layout} When using the legacy interface, transitional devices and drivers -- MST
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