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Subject: Re: [virtio-comment] Re: [PATCH v3] virtio_net: support inner header hash
On Tue, Dec 20, 2022 at 10:27 PM Heng Qi <hengqi@linux.alibaba.com> wrote:
>
>
>
> å 2022/12/16 äå6:14, Heng Qi åé:
> >
> >
> > å 2022/12/16 äå2:33, Jason Wang åé:
> >> On Mon, Dec 5, 2022 at 2:36 PM Heng Qi <hengqi@linux.alibaba.com> wrote:
> >>> When VIRTIO_NET_F_RSS is negotiated and 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 VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER feature bit and
> >> I think we can simply use VIRTIO_NET_F_HASH_TUNNEL now. And introduce
> >> VIRTIO_NET_F_HASH_TUNNEL_XYZ for future extension?
> >
> > Well, I very much agree.
> >
> >>> related bitmasks in \field{hash_types}, which instructs the device
> >>> to calculate the hash using the inner headers of GRE, VXLAN or
> >>> GENEVE-encapsulated packets. Besides, \field{hash_report_tunnel} are
> >>> added to report packet type when calculating hash over the inner
> >>> header.
> >>>
> >>> Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
> >>> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> >>> ---
> >>> 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 | 190
> >>> +++++++++++++++++++++++++++++++++++++++++++++++++---
> >>> 1 file changed, 181 insertions(+), 9 deletions(-)
> >>>
> >>> diff --git a/content.tex b/content.tex
> >>> index e863709..675da87 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_GRE_VXLAN_GENEVE_INNER(52)] Device supports
> >>> inner
> >>> + header hash for GRE, VXLAN and GENEVE-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 a tunnel packet type if
> >>> + VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER is negotiated.
> >>>
> >>> \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_GRE_VXLAN_GENEVE_INNER] Requires
> >>> VIRTIO_NET_F_CTRL_VQ and VIRTIO_NET_F_RSS.
> >>> \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)
> >>> + le8 hash_report_tunnel; (Only if VIRTIO_NET_F_HASH_REPORT
> >>> negotiated)
> >> Only if both VIRTIO_NET_F_HASH_REPORT and
> >> VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER are negotiated?
> >
> > Yes, I will make it clear.
> >
> >>
> >>> + le8 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT
> >>> negotiated)
> >>> };
> >>> \end{lstlisting}
> >>>
> >>> @@ -3837,19 +3843,22 @@ \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, the hash type and the tunnel packet
> >>> type.
> >> The tunnel type can only be reported when both HASH_REPORT and
> >> HASH_GRE_VXLAN_GENEVE_INNER are negotiated?
> >
> > Yes, I will make it clear.
> >
> >>
> >>> \end{itemize}
> >>>
> >>> If the feature VIRTIO_NET_F_RSS was negotiated:
> >>> \begin{itemize}
> >>> -\item The device uses \field{hash_types} of the
> >>> virtio_net_rss_config structure as 'Enabled hash types' bitmask.
> >>> +\item The device uses \field{hash_types} of the
> >>> virtio_net_rss_config structure as 'Enabled hash types' bitmask,
> >>> +but VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> VIRTIO_NET_HASH_TYPE_GENEVE_INNER in
> >>> +\field{hash_types} can only be used when the feature
> >>> VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER is negotiated.
> >> I think we can avoid this change by clarifying the feature dependency
> >> where the tunnel hash types are defined.
> >
> > Ok, I'll do it in the next version.
> >
> >>
> >>> \item The device uses a key as defined in \field{hash_key_data}
> >>> and \field{hash_key_length} of the virtio_net_rss_config structure (see
> >>> \ref{sec:Device Types / Network Device / Device Operation /
> >>> Control Virtqueue / Receive-side scaling (RSS) / Setting RSS
> >>> parameters}).
> >>> \end{itemize}
> >>>
> >>> If the feature VIRTIO_NET_F_RSS was not negotiated:
> >>> \begin{itemize}
> >>> -\item The device uses \field{hash_types} of the
> >>> virtio_net_hash_config structure as 'Enabled hash types' bitmask.
> >>> +\item The device uses \field{hash_types} of the
> >>> virtio_net_hash_config structure as 'Enabled hash types' bitmask,
> >>> +except VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and VIRTIO_NET_HASH_TYPE_GENEVE_INNER.
> >> Why exclude those tunnel hash types from _F_MQ? Or do we want to say
> >> the automatic packet steering could be done via the inner packet when
> >> negotiated?
> >
> > As far as I know about spec, there are two ways to select a queue to
> > place a packet.
> >
> > The first one is _F_MQ. In this scenario, if a packet arrives for the
> > first time, it will be
> > randomly placed (not based on hash) in a queue , subsequent packets of
> > the same
> > data flow will be placed in the same queue.
See the part of automatic steering:
"""
When multiqueue is enabled by VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET command,
the device MUST use automatic receive steering based on packet flow.
Programming of the receive steering classificator is implicit. After
the driver transmitted a packet of a flow on transmitqX, the device
SHOULD cause incoming packets for that flow to be steered to
receiveqX.
"""
So it doesn't exclude the possibility of using hash for steering. In
this case should we steer based on inner or outer?
Thanks
Here is what the spec says:
> > âFor uni-directional protocols, or where no packets have been
> > transmitted yet, the device MAY steer a packet to a random queue out
> > of the specified receiveq1\ldots receiveqn.";
> >
> > The second is _F_RSS. In this scenario, the device calculates the hash
> > based on the
> > outer or inner header, and uses the hash value to select the rx queue.
> > Therefore,
> > when _F_RSS is not negotiated, we seem to have no initiative to
> > actively select queues.
> > But there is no need to actively explain the exclusion of these types
> > here.
> >
> > Cc Xuan.
> >
>
> Hi Jason, what do you think about this?
>
> Thanks.
>
> >>
> >>> \item The device uses a key as defined in \field{hash_key_data}
> >>> and \field{hash_key_length} of the virtio_net_hash_config structure
> >>> (see
> >>> \ref{sec:Device Types / Network Device / Device Operation /
> >>> Control Virtqueue / Automatic receive steering in multiqueue mode /
> >>> Hash calculation}).
> >>> \end{itemize}
> >>> @@ -3883,6 +3892,18 @@ \subsubsection{Processing of Incoming
> >>> Packets}\label{sec:Device Types / Network
> >>> #define VIRTIO_NET_HASH_TYPE_TCP_EX (1 << 7)
> >>> #define VIRTIO_NET_HASH_TYPE_UDP_EX (1 << 8)
> >>> \end{lstlisting}
> >>> +Hash types applicable to inner payloads of GRE-encapsulated packets
> >>> +\begin{lstlisting}
> >>> +#define VIRTIO_NET_HASH_TYPE_GRE_INNER (1 << 9)
> >>> +\end{lstlisting}
> >>> +Hash types applicable to inner payloads of VXLAN-encapsulated packets
> >>> +\begin{lstlisting}
> >>> +#define VIRTIO_NET_HASH_TYPE_VXLAN_INNER (1 << 10)
> >>> +\end{lstlisting}
> >>> +Hash types applicable to inner payloads of GENEVE-encapsulated packets
> >>> +\begin{lstlisting}
> >>> +#define VIRTIO_NET_HASH_TYPE_GENEVE_INNER (1 << 11)
> >>> +\end{lstlisting}
> >>>
> >>> \subparagraph{IPv4 packets}
> >>> \label{sec:Device Types / Network Device / Device Operation /
> >>> Processing of Incoming Packets / Hash calculation for incoming
> >>> packets / IPv4 packets}
> >>> @@ -3975,15 +3996,148 @@ \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 payloads of GRE, VXLAN or GENEVE-encapsulated
> >>> packets}
> >>> +\label{sec:Device Types / Network Device / Device Operation /
> >>> Processing of Incoming Packets / Hash calculation for incoming
> >>> packets / Inner payloads of GRE, VXLAN or GENEVE-encapsulated packets}}
> >>> +VIRTIO_NET_HASH_TYPE_GRE_INNER, VIRTIO_NET_HASH_TYPE_VXLAN_INNER or
> >>> +VIRTIO_NET_HASH_TYPE_GENEVE_INNER bit is set at the same time as
> >>> one of
> >>> +the bits between VIRTIO_NET_HASH_TYPE_IPv4 and
> >>> VIRTIO_NET_HASH_TYPE_UDP_EX.
> >>> +
> >>> +The device calculates the hash on GRE, VXLAN or GENEVE-encapsulated
> >>> packets whose inner
> >>> +payloads are IPv4 packets according to 'Enabled hash types'
> >>> bitmasks as follows:
> >>> +\begin{itemize}
> >>> + \item If VIRTIO_NET_HASH_TYPE_TCPv4 is set along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner TCPv4 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner UDPv4 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, 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}
> >>> +
> >>> +The device calculates the hash on GRE, VXLAN or GENEVE-encapsulated
> >>> packets whose inner
> >>> +payloads are IPv6 packets without extension headers according to
> >>> 'Enabled hash types'
> >>> +bitmasks as follows:
> >>> +\begin{itemize}
> >>> + \item If VIRTIO_NET_HASH_TYPE_TCPv6 is set along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner TCPv6 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner UDPv6 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, 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}
> >>> +
> >>> +The device calculates the hash on GRE, VXLAN or GENEV-encapsulated
> >>> packets whose inner
> >>> +payloads are IPv6 packets with extension headers according to
> >>> 'Enabled hash types'
> >>> +bitmasks as follows:
> >>> +\begin{itemsize}
> >>> + \item If VIRTIO_NET_HASH_TYPE_TCP_EX is set along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner TCPv6 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, and the GRE, VXLAN or
> >>> GENEVE-encapsulated
> >>> + packet has an inner UDPv6 header in its payload, 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 along with one of
> >>> + VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> + VIRTIO_NET_HASH_TYPE_GENEVE_INNER, 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 inner IPv6 extension headers and calculate the
> >>> hash as defined
> >>> + for a GRE, VXLAN or GENEVE-encapsulated packet whose inner
> >>> payload is an IPv6
> >>> + packet without extension headers
> >>> +\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.
> >>> +And if VIRTIO_NET_F_HASH_GRE_VXLAN_GENEVE_INNER was negotiated, the
> >>> device also
> >>> +needs to fills \field{hash_report_tunnel} with the type of the
> >>> tunnel 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 \field{hash_report_tunnel} is no longer valid.
> >>>
> >>> Possible values that the device can report in \field{hash_report}
> >>> are defined below.
> >>> They correspond to supported hash types defined in
> >>> @@ -4005,6 +4159,24 @@ \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
> >>> tunnel-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_GRE 1
> >>> +#define VIRTIO_NET_HASH_REPORT_VXLAN 2
> >>> +#define VIRTIO_NET_HASH_REPORT_GENEVE 3
> >>> +\end{lstlisting}
> >>> +
> >>> +The values VIRTIO_NET_HASH_REPORT_GRE, VIRTIO_NET_HASH_REPORT_VXLAN
> >>> and
> >>> +VIRTIO_NET_HASH_REPORT_GENEVE correspond to
> >>> VIRTIO_NET_HASH_TYPE_GRE_INNER,
> >>> +VIRTIO_NET_HASH_TYPE_VXLAN_INNER and
> >>> VIRTIO_NET_HASH_TYPE_GENEVE_INNER bits
> >>> +of supported hash types defined in respectively
> >>> +\ref{sec:Device Types / Network Device / Device Operation /
> >>> Processing of Incoming Packets / Hash calculation for incoming
> >>> packets / Supported/enabled hash types}.
> >>> +
> >> I think we can simply say "They correspond to supported hash types
> >> defined in \ref{xyz}" as what is done for non-tunnel hash types?
> >
> > Ok, I agree with you.
> >
> > Thanks.
> >
> >>
> >> Thanks
> >>
> >>> \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
> >>> --
> >>> 2.19.1.6.gb485710b
> >>>
> >
> >
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