On Sunday, 2023-02-19 at 22:45:07 +08, Heng Qi wrote:
> Currently coalescing parameters are grouped for all transmit and receive
> virtqueues. This patch supports setting or getting the parameters for a
> specified virtqueue, and a typical application of this function is netdim[1].
>
> When the traffic between virtqueues is unbalanced, for example, one virtqueue
> is busy and another virtqueue is idle, then it will be very useful to
> control coalescing parameters at the virtqueue granularity.
>
> [1] https://docs.kernel.org/networking/net_dim.html
>
> Signed-off-by: Heng Qi <[email protected]>
> Reviewed-by: Xuan Zhuo <[email protected]>
> ---
> This patch is on top of Alvaro's latest v7 patch:
> https://lists.oasis-open.org/archives/virtio-dev/202302/msg00431.html .
>
> v3->v4:
> 1. Include virtio_net_ctrl_coal in the virtio_net_ctrl_coal_vq structure.
> @Alvaro Karsz
> 2. Add consideration of vq reset. @Michael S. Tsirkin, @Parav Pandit,
> @Alvaro Karsz
> 3. Avoid too many examples by giving a comprehensive example. @Michael S.
> Tsirkin
> 4. Fix typos and streamline clarifications. @Michael S. Tsirkin, @Parav
> Pandit, @Alvaro Karsz
>
> v2->v3:
> 1. Add the netdim link. @Parav Pandit
> 2. VIRTIO_NET_F_VQ_NOTF_COAL no longer depends on VIRTIO_NET_F_NOTF_COAL.
> @Michael S. Tsirkin, @Alvaro Karsz
> 3. _VQ_GET is explained more. @Michael S. Tsirkin
> 4. Add more examples to avoid misunderstandings. @Michael S. Tsirkin
> 5. Clarify some statements. @Michael S. Tsirkin, @Parav Pandit, @Alvaro
> Karsz
> 6. Adjust the virtio_net_ctrl_coal_vq structure. @Michael S. Tsirkin
> 7. Fix some typos. @Michael S. Tsirkin
>
> v1->v2:
> 1. Rename VIRTIO_NET_F_PERQUEUE_NOTF_COAL to VIRTIO_NET_F_VQ_NOTF_COAL.
> @Michael S. Tsirkin
> 2. Use the \field{vqn} instead of the qid. @Michael S. Tsirkin
> 3. Unify tx and rx control structres into one structure
> virtio_net_ctrl_coal_vq. @Michael S. Tsirkin
> 4. Add a new control command VIRTIO_NET_CTRL_NOTF_COAL_VQ. @Michael S.
> Tsirkin, @Parav Pandit, @Alvaro Karsz
> 5. The special value 0xFFF is removed because VIRTIO_NET_CTRL_NOTF_COAL
> can be used. @Alvaro Karsz
> 6. Clarify some special scenarios. @Michael S. Tsirkin, @Parav Pandit,
> @Alvaro Karsz
>
> device-types/net/description.tex | 64 ++++++++++++++++++++++++++++++--
> 1 file changed, 60 insertions(+), 4 deletions(-)
>
> diff --git a/device-types/net/description.tex
> b/device-types/net/description.tex
> index e71e33b..fa8bd26 100644
> --- a/device-types/net/description.tex
> +++ b/device-types/net/description.tex
> @@ -83,6 +83,8 @@ \subsection{Feature bits}\label{sec:Device Types / Network
> Device / Feature bits
> \item[VIRTIO_NET_F_CTRL_MAC_ADDR(23)] Set MAC address through control
> channel.
>
> +\item[VIRTIO_NET_F_VQ_NOTF_COAL(52)] Device supports virtqueue notification
> coalescing.
> +
> \item[VIRTIO_NET_F_NOTF_COAL(53)] Device supports notifications coalescing.
>
> \item[VIRTIO_NET_F_GUEST_USO4 (54)] Driver can receive USOv4 packets.
> @@ -139,6 +141,7 @@ \subsubsection{Feature bit requirements}\label{sec:Device
> Types / Network Device
> \item[VIRTIO_NET_F_NOTF_COAL] Requires VIRTIO_NET_F_CTRL_VQ.
> \item[VIRTIO_NET_F_RSC_EXT] Requires VIRTIO_NET_F_HOST_TSO4 or
> VIRTIO_NET_F_HOST_TSO6.
> \item[VIRTIO_NET_F_RSS] Requires VIRTIO_NET_F_CTRL_VQ.
> +\item[VIRTIO_NET_F_VQ_NOTF_COAL] Requires VIRTIO_NET_F_CTRL_VQ.
> \end{description}
>
> \subsubsection{Legacy Interface: Feature bits}\label{sec:Device Types /
> Network Device / Feature bits / Legacy Interface: Feature bits}
> @@ -1508,6 +1511,12 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> Types / Network Device / Devi
> If the VIRTIO_NET_F_NOTF_COAL feature is negotiated, the driver can
> send control commands for dynamically changing the coalescing parameters.
>
> +If the VIRTIO_NET_F_VQ_NOTF_COAL feature is negotiated:
> +1. a driver can send a VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET command to set the
> coalescing
> + parameters of an enabled transmit/receive virtqueue.
> +2. a driver can send a VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET command to a device,
> and the device
> + returns the coalescing parameters of an enabled transmit/receive
> virtqueue.
Use an enumeration.
> +
> \begin{note}
> The behavior of the device in response to these commands is best-effort:
> the device may generate notifications more or less frequently than specified.
> @@ -1519,25 +1528,55 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> Types / Network Device / Devi
> le32 max_usecs;
> };
>
> +struct virtio_net_ctrl_coal_vq {
> + le16 vqn;
> + le16 reserved;
> + struct virtio_net_ctrl_coal coal;
> +};
> +
> #define VIRTIO_NET_CTRL_NOTF_COAL 6
> #define VIRTIO_NET_CTRL_NOTF_COAL_TX_SET 0
> #define VIRTIO_NET_CTRL_NOTF_COAL_RX_SET 1
> + #define VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET 2
> + #define VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET 3
> \end{lstlisting}
>
> Coalescing parameters:
> \begin{itemize}
> +\item \field{vqn}: The virtqueue number of an enabled transmit or receive
> virtqueue.
> \item \field{max_usecs} for RX: Maximum number of microseconds to delay a RX
> notification.
> \item \field{max_usecs} for TX: Maximum number of microseconds to delay a TX
> notification.
> \item \field{max_packets} for RX: Maximum number of packets to receive
> before a RX notification.
> \item \field{max_packets} for TX: Maximum number of packets to send before a
> TX notification.
> \end{itemize}
>
> -The class VIRTIO_NET_CTRL_NOTF_COAL has 2 commands:
> +\field{vqn} points to an enabled transmit/receive virtqueue, and its value
> satisfies $ 0 \leq vqn < max_virtqueue_pairs \ast 2 $.
> +
> +\field{reserved} is reserved and it is ignored by the device.
> +
> +The class VIRTIO_NET_CTRL_NOTF_COAL has 4 commands:
> \begin{enumerate}
> -\item VIRTIO_NET_CTRL_NOTF_COAL_TX_SET: set the \field{max_usecs} and
> \field{max_packets} parameters for all transmit virtqueues.
> -\item VIRTIO_NET_CTRL_NOTF_COAL_RX_SET: set the \field{max_usecs} and
> \field{max_packets} parameters for all receive virtqueues.
> +\item VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET: set the \field{max_usecs} and
> \field{max_packets} parameters for an enabled transmit/receive
> + virtqueue whose number is
> \field{vqn}.
> +\item VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET: the device returns the
> \field{max_usecs} and \field{max_packets} parameters for an enabled
> + transmit/receive virtqueue whose
> number is \field{vqn}.
> +\item VIRTIO_NET_CTRL_NOTF_COAL_TX_SET: have the same effect as the
> VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET command repeated for each virtqueue of
> transmitq1\ldots transmitqN.
> +\item VIRTIO_NET_CTRL_NOTF_COAL_RX_SET: have the same effect as the
> VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET command repeated for each virtqueue of
> receiveq1\ldots receiveqN.
> \end{enumerate}
>
> +If coalescing parameters are being set, the device applies the last
> coalescing parameters received for a
> +virtqueue, regardless of the command used to set the parameters. For example
> with 2 pairs of virtqueues:
> +# Command sequece
"sequence"
> +Each of the following commands sets \field{max_usecs} and
> \field{max_packets} parameters for virtqueues.
> +\begin{itemize}
> +\item Command1: VIRTIO_NET_CTRL_NOTF_COAL_RX_SET sets parameters for
> virtqueue0 and virtqueue2, and, virtqueue1 and virtqueue3 retain their
> previous parameter values.
> +\item Command2: VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET with \field{vqn} = 0 sets
> parameters for virtqueue0, and virtqueue2 retains the values from command1.
> +\item Command3: VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET with \field{vqn}= 0, the
> device returns paramters of virtqueue0 set by command2.
Missing space before =.
> +\item Command4: VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET with \field{vqn} = 1 sets
> parameters for virtqueue1, and virtqueue3 retains its previous values.
> +\item Command5: VIRTIO_NET_CTRL_NOTF_COAL_TX_SET sets parameters for
> virtqueue1 and virtqueue3, and overrides the values set by command4.
> +\item Command6: VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET with \field{vqn}= 1, the
> device returns paramters of virtqueue1 set by command5.
Missing space before =.
> +\end{itemize}
> +
> \subparagraph{Operation}\label{sec:Device Types / Network Device / Device
> Operation / Control Virtqueue / Notifications Coalescing / Operation}
>
> The device sends a used buffer notification once the notification conditions
> are met and if the notifications are not suppressed as explained in
> \ref{sec:Basic Facilities of a Virtio Device / Virtqueues / Used Buffer
> Notification Suppression}.
> @@ -1585,14 +1624,31 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> Types / Network Device / Devi
>
> \drivernormative{\subparagraph}{Notifications Coalescing}{Device Types /
> Network Device / Device Operation / Control Virtqueue / Notifications
> Coalescing}
>
> -If the VIRTIO_NET_F_NOTF_COAL feature has not been negotiated, the driver
> MUST NOT issue VIRTIO_NET_CTRL_NOTF_COAL commands.
> +If neither the VIRTIO_NET_F_NOTF_COAL nor the VIRTIO_NET_F_VQ_NOTF_COAL
> feature
> +has not been negotiated, the driver MUST NOT issue VIRTIO_NET_CTRL_NOTF_COAL
> commands.
Too many negatives here. Just "have been negotiated".
> +
> +A driver MUST ignore the values of coalescing paramters received from
> VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET,
"parameters"
Remove the comma?
> +if the device returns with VIRTIO_NET_ERR.
>
> \devicenormative{\subparagraph}{Notifications Coalescing}{Device Types /
> Network Device / Device Operation / Control Virtqueue / Notifications
> Coalescing}
>
> A device SHOULD respond to the VIRTIO_NET_CTRL_NOTF_COAL commands with
> VIRTIO_NET_ERR if it was not able to change the parameters.
> +Note: VIRTIO_NET_CTRL_NOTF_COAL_VQ_{SET, GET} are exception to it, which
> must return VIRTIO_NET_ERR if the device was unable to change the parameters.
"an exception"
>
> A device SHOULD NOT send used buffer notifications to the driver if the
> notifications are suppressed, even if the notification conditions are met.
>
> +If a virtqueue is disabled, the device MUST clear its parameters
> configuration, and:
> +1. if the device has received a global parameter values sent by
> VIRTIO_NET_CTRL_NOTF_{RX, TX}_SET:
> +after the virtqueue is enabled, its parameters SHOULD be set to the global
> values.
> +2. if the device hasn't received the VIRTIO_NET_CTRL_NOTF_{RX, TX}_SET
> commands:
> +regardless of whether the device has received a
> VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET command, after the
> +virtqueue is enabled, its parameters SHOULD be set to 0.
Use an enumeration.
> +
> +When a device receives a virtqueue command to set or return coalescing
> parameters for the supplied \field{vqn},
> +if the virtqueue is not enabled, the device MUST respond to the command with
> VIRTIO_NET_ERR.
> +
> +A device MAY set the coalescing parameter to a value close to a power of 2
> value.
> +
> Upon reset, a device MUST initialize all coalescing parameters to 0.
>
> \subsubsection{Legacy Interface: Framing Requirements}\label{sec:Device
--
We're deep in discussion, the party's on mute.
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