* [virtio] [PATCH v3] content: document speed, duplex
@ 2019-12-03 10:39 Michael S. Tsirkin
2019-12-03 12:05 ` [virtio] " Cornelia Huck
0 siblings, 1 reply; 4+ messages in thread
From: Michael S. Tsirkin @ 2019-12-03 10:39 UTC (permalink / raw)
To: virtio-comment, virtio-dev; +Cc: virtio, Cornelia Huck
Document as used by Linux.
Fixes: https://github.com/oasis-tcs/virtio-spec/issues/59
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
---
changes from v2:
fix up units
actually there's no way for driver to know that link up
changed: it might have changed back.
make the device requirement a weaker "SHOULD" and instead
ask that driver re-read on each config change notification
content.tex | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/content.tex b/content.tex
index d68cfaf..f7a6971 100644
--- a/content.tex
+++ b/content.tex
@@ -2823,6 +2823,7 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits
\item[VIRTIO_NET_F_STANDBY(62)] Device may act as a standby for a primary
device with the same MAC address.
+\item[VIRTIO_NET_F_SPEED_DUPLEX(63)] Device reports speed and duplex.
\end{description}
\subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device / Feature bits / Feature bit requirements}
@@ -2882,12 +2883,28 @@ \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} contains the device speed, in units of 1 MBit per
+second, 0 to 0x7ffffffff, or 0xfffffffff for unknown speed.
+
+\field{duplex} has the values of 0x00 for full duplex, 0x01 for
+half duplex and 0xff for unknown duplex state.
+
+Both \field{speed} and \field{duplex} can change, thus the driver
+is expected to re-read these values after receiving a
+configuration change notification.
+
\begin{lstlisting}
struct virtio_net_config {
u8 mac[6];
le16 status;
le16 max_virtqueue_pairs;
le16 mtu;
+ le32 speed;
+ u8 duplex;
+
};
\end{lstlisting}
@@ -2916,6 +2933,19 @@ \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.
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{speed}
+MUST contain the device speed, in units of 1 MBit per second, 0 to
+0x7ffffffff, or 0xfffffffff for unknown.
+
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{duplex}
+MUST have the values of 0x00 for full duplex, 0x01 for half
+duplex, or 0xff for unknown.
+
+If VIRTIO_NET_F_SPEED_DUPLEX and VIRTIO_NET_F_STATUS have both
+been negotiated, the device SHOULD 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.
@@ -2940,6 +2970,15 @@ \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.
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated,
+the driver MUST treat any value of \field{speed} above
+0x7fffffff as well as any value of \field{duplex} not
+matching 0x00 or 0x01 as an unknown value.
+
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, the driver
+SHOULD re-read \field{speed} and \field{duplex} after a
+configuration change notification.
+
\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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* [virtio] Re: [PATCH v3] content: document speed, duplex
2019-12-03 10:39 [virtio] [PATCH v3] content: document speed, duplex Michael S. Tsirkin
@ 2019-12-03 12:05 ` Cornelia Huck
0 siblings, 0 replies; 4+ messages in thread
From: Cornelia Huck @ 2019-12-03 12:05 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: virtio-comment, virtio-dev, virtio
On Tue, 3 Dec 2019 05:39:23 -0500
"Michael S. Tsirkin" <mst@redhat.com> wrote:
> Document as used by Linux.
>
> Fixes: https://github.com/oasis-tcs/virtio-spec/issues/59
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> ---
>
> changes from v2:
> fix up units
> actually there's no way for driver to know that link up
> changed: it might have changed back.
> make the device requirement a weaker "SHOULD" and instead
> ask that driver re-read on each config change notification
>
> content.tex | 39 +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 39 insertions(+)
Looks good to me.
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* Re: [virtio] [PATCH v3] content: document speed, duplex
2019-11-24 12:14 [virtio] " Michael S. Tsirkin
@ 2019-11-25 10:34 ` Cornelia Huck
0 siblings, 0 replies; 4+ messages in thread
From: Cornelia Huck @ 2019-11-25 10:34 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: virtio, virtio-dev
On Sun, 24 Nov 2019 07:14:20 -0500
"Michael S. Tsirkin" <mst@redhat.com> wrote:
> Document as used by Linux.
>
> Fixes: https://github.com/oasis-tcs/virtio-spec/issues/59
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>
> changes from v2
> - address comments by Cornelia
> - fix more typos
> - consistent upper/lower case for hex values
> - explicitly ask that devices use 0xffffffff for unknown speed
> (this is what Linux uses)
>
>
> content.tex | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/content.tex b/content.tex
> index bff80d0..678afbe 100644
> --- a/content.tex
> +++ b/content.tex
> @@ -2892,6 +2892,7 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits
>
> \item[VIRTIO_NET_F_STANDBY(62)] Device may act as a standby for a primary
> device with the same MAC address.
> +\item[VIRTIO_NET_F_SPEED_DUPLEX(63)] Device reports speed and duplex.
> \end{description}
>
> \subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device / Feature bits / Feature bit requirements}
> @@ -2951,12 +2952,27 @@ \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} contains the device speed, in units of 1 MByte, 0
> +to 0x7ffffffff, or 0xfffffffff for unknown speed.
> +
> +\field{duplex} has the values of 0x00 for full duplex, 0x01 for
> +half duplex and 0xff for unknown duplex state.
> +
> +Neither \field{speed} not \field{duplex} changes as long as
s/not/nor/
> +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 +3001,18 @@ \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.
>
> +If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{speed}
> +MUST contain the device speed, in units of 1 MByte, 0 to
> +0x7ffffffff, or 0xfffffffff for unknown.
> +
> +If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{duplex}
> +MUST have the values of 0x00 for full duplex, 0x01 for half
> +duplex and 0xff for unknown.
s/ and/, or/
> +
> +If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, the 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 +3037,11 @@ \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.
>
> +If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated,
> +the driver MUST treat any value of \field{speed} above
> +0x7fffffff as well as any value of \field{duplex} not
> +matching 0x00 or 0x01 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
Other than the nits above
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
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* [virtio] [PATCH v3] content: document speed, duplex
@ 2019-11-24 12:14 Michael S. Tsirkin
2019-11-25 10:34 ` Cornelia Huck
0 siblings, 1 reply; 4+ messages in thread
From: Michael S. Tsirkin @ 2019-11-24 12:14 UTC (permalink / raw)
To: virtio, virtio-dev
Document as used by Linux.
Fixes: https://github.com/oasis-tcs/virtio-spec/issues/59
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
changes from v2
- address comments by Cornelia
- fix more typos
- consistent upper/lower case for hex values
- explicitly ask that devices use 0xffffffff for unknown speed
(this is what Linux uses)
content.tex | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/content.tex b/content.tex
index bff80d0..678afbe 100644
--- a/content.tex
+++ b/content.tex
@@ -2892,6 +2892,7 @@ \subsection{Feature bits}\label{sec:Device Types / Network Device / Feature bits
\item[VIRTIO_NET_F_STANDBY(62)] Device may act as a standby for a primary
device with the same MAC address.
+\item[VIRTIO_NET_F_SPEED_DUPLEX(63)] Device reports speed and duplex.
\end{description}
\subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device / Feature bits / Feature bit requirements}
@@ -2951,12 +2952,27 @@ \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} contains the device speed, in units of 1 MByte, 0
+to 0x7ffffffff, or 0xfffffffff for unknown speed.
+
+\field{duplex} has the values of 0x00 for full duplex, 0x01 for
+half duplex and 0xff for 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 +3001,18 @@ \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.
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{speed}
+MUST contain the device speed, in units of 1 MByte, 0 to
+0x7ffffffff, or 0xfffffffff for unknown.
+
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, \field{duplex}
+MUST have the values of 0x00 for full duplex, 0x01 for half
+duplex and 0xff for unknown.
+
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated, the 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 +3037,11 @@ \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.
+If VIRTIO_NET_F_SPEED_DUPLEX has been negotiated,
+the driver MUST treat any value of \field{speed} above
+0x7fffffff as well as any value of \field{duplex} not
+matching 0x00 or 0x01 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
--
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2019-12-03 10:39 [virtio] [PATCH v3] content: document speed, duplex Michael S. Tsirkin
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2019-11-24 12:14 [virtio] " Michael S. Tsirkin
2019-11-25 10:34 ` Cornelia Huck
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