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Subject: Re: [PATCH v7] virtio-net: support device stats
On Thu, 6 Jan 2022 12:00:14 +0800, Jason Wang <jasowang@redhat.com> wrote: > On Wed, Jan 5, 2022 at 10:49 AM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > > > This patch allows the driver to obtain some statistics from the device. > > > > In the back-end implementation, we can count a lot of such information, > > which can be used for debugging and judging the running status of the > > back-end. We hope to directly display it to the user through ethtool. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > Reviewed-by: Jason Wang <jasowang@redhat.com> hi, When do you think we can start voting. Can this patch enter virtio spec v1.2? Thanks. > > > --- > > v7: > > 1. add rx_reset, tx_reset > > 2. add device normative and dirver normative > > 3. add comments for *_packets, *_bytres > > > > v6: > > 1. correct the names and descriptions of some stats items > > > > v5: > > 1. add VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ > > 2. more item for virtio_net_ctrl_reply_stats_queue_pair > > > > v4: > > 1. remove dev_stats_num, {rx|tx}_stats_num > > 2. Use two commands to get the stats of queue pair and dev respectively > > > > v3 changes: > > 1. add dev_version > > 2. use queue_pair_index replace rx_num, tx_num > > 3. Explain the processing when the device and driver support different numbers > > of stats > > > > content.tex | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 122 insertions(+), 1 deletion(-) > > > > diff --git a/content.tex b/content.tex > > index cf20570..f99d663 100644 > > --- a/content.tex > > +++ b/content.tex > > @@ -3092,6 +3092,9 @@ \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_CTRL_STATS(55)] Device can provide device-level statistics > > + to the driver through the control channel. > > + > > \item[VIRTIO_NET_F_HOST_USO (56)] Device can receive USO packets. Unlike UFO > > (fragmenting the packet) the USO splits large UDP packet > > to several segments when each of these smaller packets has UDP header. > > @@ -3137,6 +3140,7 @@ \subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device > > \item[VIRTIO_NET_F_GUEST_ANNOUNCE] Requires VIRTIO_NET_F_CTRL_VQ. > > \item[VIRTIO_NET_F_MQ] Requires VIRTIO_NET_F_CTRL_VQ. > > \item[VIRTIO_NET_F_CTRL_MAC_ADDR] Requires VIRTIO_NET_F_CTRL_VQ. > > +\item[VIRTIO_NET_F_CTRL_STATS] 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. > > \end{description} > > @@ -4015,6 +4019,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > u8 command; > > u8 command-specific-data[]; > > u8 ack; > > + u8 command-specific-data-reply[]; > > }; > > > > /* ack values */ > > @@ -4023,7 +4028,8 @@ \subsubsection{Control Virtqueue}\label{sec:Device Types / Network Device / Devi > > \end{lstlisting} > > > > The \field{class}, \field{command} and command-specific-data are set by the > > -driver, and the device sets the \field{ack} byte. There is little it can > > +driver, and the device sets the \field{ack} byte and optionally > > +\field{command-specific-data-reply}. There is little it can > > do except issue a diagnostic if \field{ack} is not > > VIRTIO_NET_OK. > > > > @@ -4504,6 +4510,121 @@ \subsubsection{Legacy Interface: Framing Requirements}\label{sec:Device > > See \ref{sec:Basic > > Facilities of a Virtio Device / Virtqueues / Message Framing}. > > > > +\paragraph{Device stats}\label{sec:Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} > > + > > +If the VIRTIO_NET_F_CTRL_STATS feature is negotiated, the driver can > > +get device stats from the device by \field{command-specific-data-reply}. > > + > > +To get the stats, the following definitions are used: > > +\begin{lstlisting} > > +#define VIRTIO_NET_CTRL_STATS 6 > > +#define VIRTIO_NET_CTRL_STATS_GET_DEV 0 > > +#define VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ 1 > > +#define VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR 2 > > +\end{lstlisting} > > + > > +The following layout structure are used: > > + > > +\field{command-specific-data} > > +\begin{lstlisting} > > +struct virtio_net_ctrl_stats_queue_pair { > > + le64 queue_pair_index; > > +} > > +\end{lstlisting} > > + > > +\field{command-specific-data-reply} > > +\begin{lstlisting} > > +struct virtio_net_ctrl_reply_stats_dev { > > + le64 dev_reset; // The number of device reset. > > +} > > + > > +struct virtio_net_ctrl_reply_stats_cvq { > > + le64 request_num; // The number of requests. > > + le64 ok_num; // The number of ok ack. > > + le64 err_num; // The number of err ack. > > + > > + le64 req_rx_promisc; // The number of requests with command VIRTIO_NET_CTRL_RX_PROMISC. > > + le64 req_rx_allmulti; // The number of requests with command VIRTIO_NET_CTRL_RX_ALLMULTI. > > + le64 req_rx_alluni; // The number of requests with command VIRTIO_NET_CTRL_RX_ALLUNI. > > + le64 req_rx_nomulti; // The number of requests with command VIRTIO_NET_CTRL_RX_NOMULTI. > > + le64 req_rx_nouni; // The number of requests with command VIRTIO_NET_CTRL_RX_NOUNI. > > + le64 req_rx_nobcast; // The number of requests with command VIRTIO_NET_CTRL_RX_NOBCAST. > > + le64 req_mac_table_set; // The number of requests with command VIRTIO_NET_CTRL_MAC_TABLE_SET. > > + le64 req_mac_addr_set; // The number of requests with command VIRTIO_NET_CTRL_MAC_ADDR_SET. > > + le64 req_vlan_add; // The number of requests with command VIRTIO_NET_CTRL_VLAN_ADD. > > + le64 req_vlan_del; // The number of requests with command VIRTIO_NET_CTRL_VLAN_DEL. > > + le64 req_announce_ack; // The number of requests with command VIRTIO_NET_CTRL_ANNOUNCE_ACK. > > + le64 req_mq_vq_pairs_set; // The number of requests with command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET. > > + le64 req_mq_rss_config; // The number of requests with command VIRTIO_NET_CTRL_MQ_RSS_CONFIG. > > + le64 req_mq_hash_config; // The number of requests with command VIRTIO_NET_CTRL_MQ_HASH_CONFIG. > > + le64 req_guest_offloads_set; // The number of requests with command VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET. > > +} > > + > > +struct virtio_net_ctrl_reply_stats_queue_pair { > > + /* rx stats */ > > + le64 rx_packets; // The number of packets recived by device, include the droped packets by device. > > + le64 rx_bytes; // The number of bytes recived by device, include the droped packets by device. > > + > > + le64 rx_notification; // The number of notifications from driver. > > + le64 rx_interrupt; // The number of interrupts generated by device. > > + > > + le64 rx_drop; // The number of packets dropped by the rx queue. Contains all kinds of packet drop. > > + le64 rx_drop_overruns; // The number of packets dropped by the rx queue when no more avail desc. > > + le64 rx_drop_oversize; // The number of oversized packets received by the rx queue. > > + > > + le64 rx_csum_valid; // The number of packets with VIRTIO_NET_HDR_F_DATA_VALID. > > + le64 rx_csum_partial; // The number of packets with VIRTIO_NET_HDR_F_NEEDS_CSUM. > > + le64 rx_csum_bad; // The number of packets with abnormal csum. > > + le64 rx_csum_none; // The number of packets without hardware csum. > > + > > + le64 rx_gso_packets; // The number of gso packets received by rx. > > + le64 rx_gso_bytes; // The number of gso bytes received by rx. > > + le64 rx_reset; // The number of queue resets. > > + > > + /* tx stats */ > > + le64 tx_packets; // The number of packets sent by device, excluding the droped packets by device. > > + le64 tx_bytes; // The number of bytes sent by device, excluding the droped packets by device. > > + > > + le64 tx_notification; // The number of notifications from driver. > > + le64 tx_interrupt; // The number of interrupts generated by device. > > + > > + le64 tx_drop; // The number of packets dropped by the tx queue. Contains all kinds of packet drop. > > + le64 tx_drop_desc_err; // The number of packets dropped when desc is error. > > + > > + le64 tx_csum_none; // The number of packets that doesn't require hardware csum. > > + le64 tx_csum_partial; // The number of packets that requires hardware csum. > > + > > + le64 tx_gso_packets; // The number of gso packets transmitted. > > + le64 tx_gso_bytes; // The number of gso bytes transmitted. > > + le64 tx_reset; // The number of queue resets. > > +} > > +\end{lstlisting} > > + > > +All device stats are divided into three categories: > > +\begin{itemize} > > + \item the stats of the device. (command: VIRTIO_NET_CTRL_STATS_GET_DEV) > > + \item the stats of the controlq. (command: VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ) > > + \item the stats of the queue pair. This contains the stats of rx and tx. > > + (command: VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR) > > +\end{itemize} > > + > > +\devicenormative{\subparagraph}{Device stats}{Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} > > +If VIRTIO_NET_F_CTRL_VQ is not negotiated, device MUST set the ack of > > +\field{virtio_net_ctrl} to VIRTIO_NET_ERR to reply VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ. > > + > > +If the requested queue_pair_index is out of range, device MUST set the ack of \field{virtio_net_ctrl} to VIRTIO_NET_ERR; > > + > > +\drivernormative{\subparagraph}{Device stats}{Device Types / Network Device / Device Operation / Control Virtqueue / Device stats} > > +When driver sends a VIRTIO_NET_CTRL_STATS_GET_DEV command, \field{command-specific-data} MUST be empty. > > +The structure \field{virtio_net_ctrl_reply_stats_dev} MUST be used for \field{command-specific-data-reply}. > > + > > +When driver sends a VIRTIO_NET_CTRL_STATS_GET_CTRL_VQ command, \field{command-specific-data} MUST be empty. > > +The structure \field{virtio_net_ctrl_reply_stats_cvq} MUST be used for \field{command-specific-data-reply}. > > + > > +Driver sends a VIRTIO_NET_CTRL_STATS_GET_QUEUE_PAIR command using \field{virtio_net_ctrl_stats_queue_pair} for \field{command-specific-data}. > > +At the same time, the structure \field{virtio_net_ctrl_reply_stats_queue_pair} MUST be used for \field{command-specific-data-reply}. > > +\field{queue_pair_index} specify the queue pair index of the queue that the driver wants to get stats. > > + > > \section{Block Device}\label{sec:Device Types / Block Device} > > > > The virtio block device is a simple virtual block device (ie. > > -- > > 2.31.0 > > >
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