On Wed, Jan 04, 2023 at 10:36:26AM +0800, Heng Qi wrote:
>
>
> 在 2023/1/3 下午11:41, Michael S. Tsirkin 写道:
> > On Tue, Jan 03, 2023 at 10:25:18PM +0800, Heng Qi wrote:
> > > If the tunnel is used to encapsulate the packets, the hash calculated
> > > using the outer header of the receive packets is always fixed for the
> > > same flow packets, i.e. they will be steered to the same receive queue.
> > >
> > > We add a feature bit VIRTIO_NET_F_HASH_TUNNEL and related bitmasks
> > > in \field{hash_types}, which instructs the device to calculate the
> > > hash using the inner headers of tunnel-encapsulated packets. Besides,
> > > values in \field{hash_report_tunnel} are added to report tunnel types.
> > >
> > > Fixes: https://github.com/oasis-tcs/virtio-spec/issues/151
> > >
> > > Reviewed-by: Jason Wang <[email protected]>
> > > Signed-off-by: Heng Qi <[email protected]>
> > > Signed-off-by: Xuan Zhuo <[email protected]>
> > > ---
> > > v5:
> > > 1. Fix some syntax and capitalization issues. @Michael S. Tsirkin
> > > 2. Use encapsulated/encaptulation uniformly. @Michael S. Tsirkin
> > > 3. Move the links to introduction section. @Michael S. Tsirkin
> > > 4. Clarify some sentences. @Michael S. Tsirkin
> > >
> > > v4:
> > > 1. Clarify some paragraphs. @Cornelia Huck
> > > 2. Fix the u8 type. @Cornelia Huck
> > >
> > > v3:
> > > 1. Rename VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER to
> > > VIRTIO_NET_F_HASH_TUNNEL. @Jason Wang
> > > 2. Make things clearer. @Jason Wang @Michael S. Tsirkin
> > > 3. Keep the possibility to use inner hash for automatic receive
> > > steering. @Jason Wang
> > > 4. Add the "Tunnel packet" paragraph to avoid repeating the GRE etc.
> > > many times. @Michael S. Tsirkin
> > >
> > > v2:
> > > 1. Add a feature bit for GRE/VXLAN/GENEVE inner hash. @Jason Wang
> > > 2. Chang \field{hash_tunnel} to \field{hash_report_tunnel}. @Jason
> > > Wang, @Michael S. Tsirkin
> > >
> > > v1:
> > > 1. Remove the patch for the bitmask fix. @Michael S. Tsirkin
> > > 2. Clarify some paragraphs. @Jason Wang
> > > 3. Add \field{hash_tunnel} and VIRTIO_NET_HASH_REPORT_GRE. @Yuri
> > > Benditovich
> > >
> > > content.tex | 193 +++++++++++++++++++++++++++++++++++++++++++++--
> > > introduction.tex | 19 +++++
> > > 2 files changed, 205 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/content.tex b/content.tex
> > > index e863709..89b0039 100644
> > > --- a/content.tex
> > > +++ b/content.tex
> > > @@ -3084,6 +3084,9 @@ \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_HASH_TUNNEL(52)] Device supports inner
> > > + header hash for GRE, VXLAN and GENEVE tunnel-encapsulated packets.
> > > +
> > > \item[VIRTIO_NET_F_NOTF_COAL(53)] Device supports notifications
> > > coalescing.
> > > \item[VIRTIO_NET_F_GUEST_USO4 (54)] Driver can receive USOv4 packets.
> > > @@ -3095,7 +3098,8 @@ \subsection{Feature bits}\label{sec:Device Types /
> > > Network Device / Feature bits
> > > to several segments when each of these smaller packets has UDP header.
> > > \item[VIRTIO_NET_F_HASH_REPORT(57)] Device can report per-packet hash
> > > - value and a type of calculated hash.
> > > + value, a type of calculated hash, and, if VIRTIO_NET_F_HASH_TUNNEL
> > > + is negotiated, a encapsulation packet type.
> > an encapsulation
>
> Ok, I'll fix it.
>
> >
> > > \item[VIRTIO_NET_F_GUEST_HDRLEN(59)] Driver can provide the exact
> > > \field{hdr_len}
> > > value. Device benefits from knowing the exact header length.
> > > @@ -3140,6 +3144,7 @@ \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_HASH_TUNNEL] 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}
> > > @@ -3386,7 +3391,8 @@ \subsection{Device Operation}\label{sec:Device
> > > Types / Network Device / Device O
> > > le16 num_buffers;
> > > le32 hash_value; (Only if VIRTIO_NET_F_HASH_REPORT
> > > negotiated)
> > > le16 hash_report; (Only if VIRTIO_NET_F_HASH_REPORT
> > > negotiated)
> > > - le16 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT
> > > negotiated)
> > > + u8 hash_report_tunnel; (Only if VIRTIO_NET_F_HASH_REPORT
> > > negotiated, only valid of VIRTIO_NET_F_HASH_TUNNEL negotiated)
> > > + u8 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT
> > > negotiated)
> > > };
> > > \end{lstlisting}
> > > @@ -3837,7 +3843,8 @@ \subsubsection{Processing of Incoming
> > > Packets}\label{sec:Device Types / Network
> > > A device attempts to calculate a per-packet hash in the following cases:
> > > \begin{itemize}
> > > \item The feature VIRTIO_NET_F_RSS was negotiated. The device uses the
> > > hash to determine the receive virtqueue to place incoming packets.
> > > -\item The feature VIRTIO_NET_F_HASH_REPORT was negotiated. The device
> > > reports the hash value and the hash type with the packet.
> > > +\item The feature VIRTIO_NET_F_HASH_REPORT was negotiated. The device
> > > reports the hash value and the hash type. If additionally
> > > +VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device reports the
> > > encapsulation type as well.
> > > \end{itemize}
> > > If the feature VIRTIO_NET_F_RSS was negotiated:
> > > @@ -3863,8 +3870,38 @@ \subsubsection{Processing of Incoming
> > > Packets}\label{sec:Device Types / Network
> > > \ref{sec:Device Types / Network Device / Device Operation / Control
> > > Virtqueue / Automatic receive steering in multiqueue mode / Hash
> > > calculation}.
> > > \end{itemize}
> > > +\subparagraph{Tunnel/Encapsulated packet}
> > > +\label{sec:Device Types / Network Device / Device Operation / Processing
> > > of Incoming Packets / Hash calculation for incoming packets /
> > > Tunnel/Encapsulated packet}
> > > +A tunnel packet is encapsulated from the original packet based on the
> > > tunneling
> > > +protocol (only a single level of encapsulation is currently supported),
> > > and the
> > > +packet contains an outer header and an inner header. The device
> > > calculates the
> > > +hash over
> > over either
>
> Ok.
>
> >
> > > the inner header or outer header,
> > or the outer header
>
> Ok.
>
> >
> > > and uses the hash to determine the
> > > +receive virtqueue to place incoming encapsulated packet.
> > "and uses the hash" does not belong here, it does not have to be
> > used like this e.g. if RSS if off.
>
> This does overlap with \paragraph{Hash calculation for incoming packets}, so
> I'll drop this.
>
> >
> > > +
> > > +When the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the
> > > encapsulation
> > > +type
> > the encapsulation type seems vague. maybe "the corresponding encapsulation
> > type".
>
> Ok, I'll modify it in the next version.
>
> >
> > > is set in \field{hash_types}, the hash for specific type of encapsulated
> > > +packet is calculated over the inner as opposed to outer header. Supported
> > > +encapsulation types are listed in \ref{sec:Device Types / Network Device
> > > /
> > > +Device Operation / Processing of Incoming Packets / Hash calculation for
> > > incoming packets /
> > > +Supported/enabled hash types}.
> > > +
> > > +If both VIRTIO_NET_F_REPORT and VIRTIO_NET_F_HASH_TUNNEL are negotiated,
> > > +the device supports
> > can support
>
> Ok.
>
> >
> > > inner hash calculation for \hyperref[intro:GRE]{[GRE]},
> > > +\hyperref[intro:VXLAN]{[VXLAN]} and \hyperref[intro:GENEVE]{[GENEVE]}
> > > +encapsulated packets, and the corresponding encapsulation type in
> > > +\field{hash_types} is VIRTIO_NET_HASH_TYPE_{GRE, VXLAN, GENEVE}_INNER.
> > .. respectively
>
> Ok.
>
> >
> > > +Besides, the value in \field{hash_report_tunnel} is
> > > +VIRTIO_NET_HASH_REPORT_{GRE, VXLAN, GENEVE}.
> > Besides what?
>
> I just mean "simultaneously".
replace with a condition specifying when it takes place.
> > and it can also be set to NONE right?
>
> Yes, I'll fix it in the next version.
>
> > > +
> > > +If VIRTIO_NET_F_REPORT is negotiated but VIRTIO_NET_F_HASH_TUNNEL is not
> > > +negotiated, the device calculates the hash over the outer header, and
> > > +\field{hash_report} reports the hash types.
> > type
>
> Ok.
>
> >
> > > Besides, \field{hash_report_tunnel}
> > > +is set to VIRTIO_NET_HASH_REPORT_TUNNEL_NONE.
> > > +
> > I don't think we can do this, you are retroactively adding requirements
> > for existing devices without VIRTIO_NET_F_HASH_TUNNEL.
> > this field is not valid.
>
> You are right, "invalid" instead of "NONE" would be more correct.
>
> >
> > > \subparagraph{Supported/enabled hash types}
> > > \label{sec:Device Types / Network Device / Device Operation /
> > > Processing of Incoming Packets / Hash calculation for incoming packets /
> > > Supported/enabled hash types}
> > > +This paragraph relies on definitions from \hyperref[intro:IP]{[IP]},
> > > +\hyperref[intro:UDP]{[UDP]} and \hyperref[intro:TCP]{[TCP]}.
> > > Hash types applicable for IPv4 packets:
> > > \begin{lstlisting}
> > > #define VIRTIO_NET_HASH_TYPE_IPv4 (1 << 0)
> > > @@ -3884,6 +3921,22 @@ \subsubsection{Processing of Incoming
> > > Packets}\label{sec:Device Types / Network
> > > #define VIRTIO_NET_HASH_TYPE_UDP_EX (1 << 8)
> > > \end{lstlisting}
> > > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated, the encapsulation
> > > +hash type below indicates that the hash is calculated over the inner
> > > +header of the encapsulated packet:
> > > +Hash type applicable to inner payload of the gre-encapsulated packet
> > > +\begin{lstlisting}
> > > +#define VIRTIO_NET_HASH_TYPE_GRE_INNER (1 << 9)
> > > +\end{lstlisting}
> > > +Hash type applicable to inner payload of the vxlan-encapsulated packet
> > > +\begin{lstlisting}
> > > +#define VIRTIO_NET_HASH_TYPE_VXLAN_INNER (1 << 10)
> > > +\end{lstlisting}
> > > +Hash type applicable to inner payload of the geneve-encapsulated packet
> > > +\begin{lstlisting}
> > > +#define VIRTIO_NET_HASH_TYPE_GENEVE_INNER (1 << 11)
> > > +\end{lstlisting}
> > > +
> > "Applicable for" not "applicable to".
>
> Ok.
>
> >
> >
> > > \subparagraph{IPv4 packets}
> > > \label{sec:Device Types / Network Device / Device Operation /
> > > Processing of Incoming Packets / Hash calculation for incoming packets /
> > > IPv4 packets}
> > > The device calculates the hash on IPv4 packets according to 'Enabled
> > > hash types' bitmask as follows:
> > > @@ -3975,15 +4028,125 @@ \subsubsection{Processing of Incoming
> > > Packets}\label{sec:Device Types / Network
> > > (see \ref{sec:Device Types / Network Device / Device Operation /
> > > Processing of Incoming Packets / Hash calculation for incoming packets /
> > > IPv6 packets without extension header}).
> > > \end{itemize}
> > > +\subparagraph{Inner payload of the encapsulated packet}
> > an encapsulated packet
>
> Ok.
>
> >
> > > +\label{sec:Device Types / Network Device / Device Operation / Processing
> > > of Incoming Packets / Hash calculation for incoming packets / Inner
> > > payload of the encapsulated packet}
> > > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the
> > > corresponding
> > > +encapsulation hash type is set in \field{hash_types}, the device
> > > calculates the
> > > +inner header hash on the encapsulated packet (See \ref{sec:Device Types
> > an encapsulated packet
>
> Ok.
>
> >
> > > +/ Network Device / Device Operation / Processing of Incoming Packets /
> > > +Hash calculation for incoming packets / Tunnel/Encapsulated packet}) as
> > > follows:
> > > +
> > > +If the inner payload of the encapsulated packet is an IPv4 packet and
> > > 'Enabled hash types'
> > > +bitmasks are set as follows:
> > this is still confusing and agrammatical. original text says things like:
> >
> > The device calculates the hash on IPv4 packets according to 'Enabled
> > hash types' bitmask as follows:
> >
> > adjust text accordingly.
>
> I will make corresponding adjustments in the next version.
>
> Thanks.
>
> >
> >
> >
> > > +\begin{itemize}
> > > + \item If VIRTIO_NET_HASH_TYPE_TCPv4 is set and the encapsulated packet
> > > has an inner
> > > + TCPv4 header, the hash is calculated over the following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IP address
> > > + \item inner Destination IP address
> > > + \item inner Source TCP port
> > > + \item inner Destination TCP port
> > > + \end{itemsize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_UDPv4 is set and the encapsulated
> > > packet has an
> > > + inner UDPv4 header, the hash is calculated over the following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IP address
> > > + \item inner Destination IP address
> > > + \item inner Source UDP port
> > > + \item inner Destination UDP port
> > > + \end{itemize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_IPv4 is set, the hash is calculated
> > > over the
> > > + following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IP address
> > > + \item inner Destination IP address
> > > + \end{itemsize}
> > > + \item Else the device does not calculate the hash
> > > +\end{itemize}
> > > +
> > > +If the inner payload of the encapsulated packet is an IPv6 packet
> > > without an extension
> > > +header and 'Enabled hash types' bitmasks are set as follows:
> > > +\begin{itemize}
> > > + \item If VIRTIO_NET_HASH_TYPE_TCPv6 is set and the encapsulated packet
> > > has an inner
> > > + TCPv6 header, the hash is calculated over the following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IPv6 address
> > > + \item inner Destination IPv6 address
> > > + \item inner Source TCP port
> > > + \item inner Destination TCP port
> > > + \end{itemsize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_UDPv6 is set and the encapsulated
> > > packet has an
> > > + inner UDPv6 header, the hash is calculated over the following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IPv6 address
> > > + \item inner Destination IPv6 address
> > > + \item inner Source UDP port
> > > + \item inner Destination UDP port
> > > + \end{itemize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_IPv6 is set, the hash is calculated
> > > over the
> > > + following fields:
> > > + \begin{itemsize}
> > > + \item inner Source IPv6 address
> > > + \item inner Destination IPv6 address
> > > + \end{itemsize}
> > > + \item Else the device does not calculate the hash
> > > +\end{itemize}
> > > +
> > > +If the inner payload of the encapsulated packet is an IPv6 packet with
> > > an extension header
> > > +and 'Enabled hash types' bitmasks are set as follows:
> > > +\begin{itemsize}
> > > + \item If VIRTIO_NET_HASH_TYPE_TCP_EX is set and the encapsulated
> > > packet has an inner
> > > + TCPv6 header, the hash is calculated over the following fields:
> > > + \begin{itemize}
> > > + \item Home address from the home address option in the inner
> > > IPv6 destination
> > > + options header. If the inner extension header is not
> > > present, use the
> > > + inner Source IPv6 address.
> > > + \item IPv6 address that is contained in the
> > > Routing-Header-Type-2 from the
> > > + associated inner extension header. If the inner extension
> > > header is not
> > > + present, use the inner Destination IPv6 address.
> > > + \item inner Source TCP port
> > > + \item inner Destination TCP port
> > > + \end{itemize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_UDP_EX is set and the encapsulated
> > > packet has an inner
> > > + UDPv6 header, the hash is calculated over the following fields:
> > > + \begin{itemsize}
> > > + \item Home address from the home address option in the inner
> > > IPv6 destination
> > > + options header. If the inner extension header is not
> > > present, use the
> > > + inner Source IPv6 address.
> > > + \item IPv6 address that is contained in the
> > > Routing-Header-Type-2 from the
> > > + associated inner extension header. If the inner extension
> > > header is not
> > > + present, use the inner Destination IPv6 address.
> > > + \item inner Source UDP port
> > > + \item inner Destination UDP port
> > > + \end{itemize}
> > > + \item Else if VIRTIO_NET_HASH_TYPE_IP_EX is set, the hash is
> > > calculated over the
> > > + following fields:
> > > + \begin{itemsize}
> > > + \item Home address from the home address option in the inner
> > > IPv6 destination
> > > + options header. If the inner extension header is not
> > > present, use the
> > > + inner Source IPv6 address.
> > > + \item IPv6 address that is contained in the
> > > Routing-Header-Type-2 from the
> > > + associated inner extension header. If the inner extension
> > > header is not
> > > + present, use the inner Destination IPv6 address.
> > > + \end{itemize}
> > > + \item Else skip the inner IPv6 extension header and calculate the
> > > inner header hash as
> > > + defined for an encapsulated packet whose inner payload is an IPv6
> > > packet without
> > > + an extension header.
> > > +\end{itemsize}
> > > +
> > > \paragraph{Hash reporting for incoming packets}
> > > \label{sec:Device Types / Network Device / Device Operation /
> > > Processing of Incoming Packets / Hash reporting for incoming packets}
> > > -If VIRTIO_NET_F_HASH_REPORT was negotiated and
> > > - the device has calculated the hash for the packet, the device fills
> > > \field{hash_report} with the report type of calculated hash
> > > -and \field{hash_value} with the value of calculated hash.
> > > +If VIRTIO_NET_F_HASH_REPORT was negotiated and the device has calculated
> > > the
> > > +hash for the packet, the device fills \field{hash_report} with the
> > > report type
> > > +of calculated hash, and \field{hash_value} with the value of calculated
> > > hash.
> > > +Also, if VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device needs to
> > > fill
> > > +\field{hash_report_tunnel} with the report type of the encapsulated
> > > packet, and
> > > +it is set to VIRTIO_NET_HASH_REPORT_TUNNEL_NONE for the unencapsulated
> > > packet.
> > > If VIRTIO_NET_F_HASH_REPORT was negotiated but due to any reason the
> > > -hash was not calculated, the device sets \field{hash_report} to
> > > VIRTIO_NET_HASH_REPORT_NONE.
> > > +hash was not calculated, the device sets \field{hash_report} to
> > > VIRTIO_NET_HASH_REPORT_NONE,
> > > +and sets \field{hash_report_tunnel} to
> > > VIRTIO_NET_HASH_REPORT_TUNNEL_NONE.
> > > Possible values that the device can report in \field{hash_report} are
> > > defined below.
> > > They correspond to supported hash types defined in
> > > @@ -4005,6 +4168,22 @@ \subsubsection{Processing of Incoming
> > > Packets}\label{sec:Device Types / Network
> > > #define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9
> > > \end{lstlisting}
> > > +If \field{hash_report} differs from VIRTIO_NET_HASH_REPORT_NONE,
> > > +\field{hash_report_tunnel} can report the type of the encapsulated
> > > +packet to the driver over the inner header hash calculation.
> > > +Possible values that the device can report in \field{hash_report_tunnel}
> > > +are defined below:
> > > +
> > > +\begin{lstlisting}
> > > +#define VIRTIO_NET_HASH_REPORT_TUNNEL_NONE 0
> > > +#define VIRTIO_NET_HASH_REPORT_GRE 1
> > > +#define VIRTIO_NET_HASH_REPORT_VXLAN 2
> > > +#define VIRTIO_NET_HASH_REPORT_GENEVE 3
> > > +\end{lstlisting}
> > > +
> > > +They correspond to supported hash types defined in
> > > +\ref{sec:Device Types / Network Device / Device Operation / Processing
> > > of Incoming Packets / Hash calculation for incoming packets /
> > > Supported/enabled hash types}.
> > > +
> > > \subsubsection{Control Virtqueue}\label{sec:Device Types / Network
> > > Device / Device Operation / Control Virtqueue}
> > > The driver uses the control virtqueue (if VIRTIO_NET_F_CTRL_VQ is
> > > diff --git a/introduction.tex b/introduction.tex
> > > index 287c5fc..ff01a9b 100644
> > > --- a/introduction.tex
> > > +++ b/introduction.tex
> > > @@ -98,6 +98,25 @@ \section{Normative References}\label{sec:Normative
> > > References}
> > > \phantomsection\label{intro:SEC1}\textbf{[SEC1]} &
> > > Standards for Efficient Cryptography Group(SECG), ``SEC1: Elliptic
> > > Cureve Cryptography'', Version 1.0, September 2000.
> > > \newline\url{https://www.secg.org/sec1-v2.pdf}\\
> > > + \phantomsection\label{intro:GRE}\textbf{[GRE]} &
> > > + Generic Routing Encapsulation
> > > + \newline\url{https://datatracker.ietf.org/doc/rfc2784/}\\
> > > + \phantomsection\label{intro:VXLAN}\textbf{[VXLAN]} &
> > > + Virtual eXtensible Local Area Network
> > > + \newline\url{https://datatracker.ietf.org/doc/rfc7348/}\\
> > > + \phantomsection\label{intro:GENEVE}\textbf{[GENEVE]} &
> > > + Generic Network Virtualization Encapsulation
> > > + \newline\url{https://datatracker.ietf.org/doc/rfc8926/}\\
> > > + \phantomsection\label{intro:IP}\textbf{[IP]} &
> > > + INTERNET PROTOCOL
> > > + \newline\url{https://www.rfc-editor.org/rfc/rfc791}\\
> > > + \phantomsection\label{intro:UDP}\textbf{[UDP]} &
> > > + User Datagram Protocol
> > > + \newline\url{https://www.rfc-editor.org/rfc/rfc768}\\
> > > + \phantomsection\label{intro:TCP}\textbf{[TCP]} &
> > > + TRANSMISSION CONTROL PROTOCOL
> > > + \newline\url{https://www.rfc-editor.org/rfc/rfc793}\\
> > > +
> > > \end{longtable}
> > > --
> > > 2.19.1.6.gb485710b
>
>
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