On Mon, Feb 13, 2023 at 09:05:04PM +0800, Heng Qi wrote:
> Hi, all.
>
> Do you have any comments on this version?
>
> Thanks.
>
> 在 2023/2/8 下午5:08, Heng Qi 写道:
> > 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_tunnel_types}, which instructs the device to calculate the
> > hash using the inner headers of tunnel-encapsulated packets. Besides,
> > values in \field{hash_report_tunnel_types} are added to report tunnel types.
> >
> > Note that VIRTIO_NET_F_HASH_TUNNEL only indicates the ability of the inner
> > header hash, and does not give the device the ability to use the hash value
> > to select a receiving queue to place the packet.
> >
> > 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]>
I didn't yes come up with anything convincing for improving
security (dos/usage info leak due to queue collisions between
tunnels).
I'd like to at least have a security considerations section
documenting the issue with using RSS with tunneling.
In fact it's high time we started adding these sections all over
the place.
I also found out at least mlx5 has these tunnel offloads,
so I'd like to ask nvidia guys here on list
- does this cover e.g. mlx5 functionality? e.g. is the tunnel list
sufficient?
- does mlx5 cover queue collisions between tunnels and if yes how?
Thanks!
> > ---
> > v7->v8:
> > 1. Add supported_hash_tunnel_types. @Jason Wang, @Parav Pandit
> > 2. Change hash_report_tunnel to hash_report_tunnel_types. @Parav Pandit
> > 3. Removed re-definition for inner packet hashing. @Parav Pandit
> > 4. Fix some typos. @Michael S . Tsirkin
> > 5. Clarify some sentences. @Michael S . Tsirkin
> >
> > v6->v7:
> > 1. Modify the wording of some sentences for clarity. @Michael S. Tsirkin
> > 2. Fix some syntax issues. @Michael S. Tsirkin
> >
> > v5->v6:
> > 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->v5:
> > 1. Clarify some paragraphs. @Cornelia Huck
> > 2. Fix the u8 type. @Cornelia Huck
> >
> > v3->v4:
> > 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->v3:
> > 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->v2:
> > 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 | 135 ++++++++++++++++++++++++++++++++++++++++++-----
> > introduction.tex | 19 +++++++
> > 2 files changed, 140 insertions(+), 14 deletions(-)
> >
> > diff --git a/content.tex b/content.tex
> > index e863709..2598d96 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 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, an encapsulation packet type.
> > \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}
> > @@ -3199,20 +3204,27 @@ \subsection{Device configuration
> > layout}\label{sec:Device Types / Network Device
> > u8 rss_max_key_size;
> > le16 rss_max_indirection_table_length;
> > le32 supported_hash_types;
> > + le32 supported_tunnel_hash_types;
> > };
> > \end{lstlisting}
> > -The following field, \field{rss_max_key_size} only exists if
> > VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT is set.
> > +The following field, \field{rss_max_key_size} only exists if
> > VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL is
> > set.
> > It specifies the maximum supported length of RSS key in bytes.
> > The following field, \field{rss_max_indirection_table_length} only exists
> > if VIRTIO_NET_F_RSS is set.
> > It specifies the maximum number of 16-bit entries in RSS indirection
> > table.
> > The next field, \field{supported_hash_types} only exists if the device
> > supports hash calculation,
> > -i.e. if VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT is set.
> > +i.e. if VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or
> > VIRTIO_NET_F_HASH_TUNNEL is set.
> > Field \field{supported_hash_types} contains the bitmask of supported hash
> > types.
> > See \ref{sec:Device Types / Network Device / Device Operation /
> > Processing of Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash types} for details of supported hash types.
> > +The next field, \field{supported_tunnel_hash_types} only exists if the
> > device
> > +supports inner hash calculation, i.e. if VIRTIO_NET_F_HASH_TUNNEL is set.
> > +
> > +Field \field{supported_tunnel_hash_types} contains the bitmask of
> > supported tunnel hash types.
> > +See \ref{sec:Device Types / Network Device / Device Operation / Processing
> > of Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled tunnel hash types} for details of supported tunnel hash
> > types.
> > +
> > \devicenormative{\subsubsection}{Device configuration layout}{Device
> > Types / Network Device / Device configuration layout}
> > The device MUST set \field{max_virtqueue_pairs} to between 1 and 0x8000
> > inclusive,
> > @@ -3236,7 +3248,7 @@ \subsection{Device configuration
> > layout}\label{sec:Device Types / Network Device
> > negotiated.
> > The device MUST set \field{rss_max_key_size} to at least 40, if it offers
> > -VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT.
> > +VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT or VIRTIO_NET_F_HASH_TUNNEL.
> > The device MUST set \field{rss_max_indirection_table_length} to at least
> > 128, if it offers
> > VIRTIO_NET_F_RSS.
> > @@ -3384,9 +3396,10 @@ \subsection{Device Operation}\label{sec:Device Types
> > / Network Device / Device O
> > le16 csum_start;
> > le16 csum_offset;
> > 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)
> > + le32 hash_value; (Only if VIRTIO_NET_F_HASH_REPORT
> > negotiated)
> > + le16 hash_report; (Only if VIRTIO_NET_F_HASH_REPORT
> > negotiated)
> > + u8 hash_report_tunnel_types; (Only if VIRTIO_NET_F_HASH_REPORT
> > negotiated, only valid if VIRTIO_NET_F_HASH_TUNNEL negotiated, otherwise
> > reserved)
> > + u8 padding_reserved; (Only if VIRTIO_NET_F_HASH_REPORT
> > negotiated)
> > };
> > \end{lstlisting}
> > @@ -3838,11 +3851,15 @@ \subsubsection{Processing of Incoming
> > Packets}\label{sec:Device Types / Network
> > \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.
> > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device
> > reports the encapsulation type as well.
> > +\item The feature VIRTIO_NET_F_HASH_TUNNEL was negotiated. The device
> > supports inner hash calculation.
> > \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.
> > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device
> > uses \field{hash_tunnel_types} of the
> > + virtio_net_rss_config structure as 'Enabled hash tunnel types' bitmask.
> > \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}
> > @@ -3850,11 +3867,13 @@ \subsubsection{Processing of Incoming
> > Packets}\label{sec:Device Types / Network
> > 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.
> > + If additionally VIRTIO_NET_F_HASH_TUNNEL was negotiated, the device
> > uses \field{hash_tunnel_types} of the
> > + virtio_net_hash_config structure as 'Enabled hash tunnel types' bitmask.
> > \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}
> > -Note that if the device offers VIRTIO_NET_F_HASH_REPORT, even if it
> > supports only one pair of virtqueues, it MUST support
> > +Note that if the device offers VIRTIO_NET_F_HASH_REPORT or
> > VIRTIO_NET_F_HASH_TUNNEL, even if it supports only one pair of virtqueues,
> > it MUST support
> > at least one of commands of VIRTIO_NET_CTRL_MQ class to configure
> > reported hash parameters:
> > \begin{itemize}
> > \item If the device offers VIRTIO_NET_F_RSS, it MUST support
> > VIRTIO_NET_CTRL_MQ_RSS_CONFIG command per
> > @@ -3863,8 +3882,37 @@ \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). The
> > +encapsulated packet contains an outer header and an inner header, and the
> > device
> > +calculates the hash over either the inner header or the outer header.
> > +
> > +When the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the
> > corresponding
> > +encapsulation type is set in \field{hash_tunnel_types}, the hash for a
> > 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 tunnel types}.
> > +
> > +If both VIRTIO_NET_F_HASH_REPORT and VIRTIO_NET_F_HASH_TUNNEL are
> > negotiated,
> > +and the corresponding encapsulation type is set in
> > \field{hash_tunnel_types},
> > +the device supports inner hash calculation for the encapsulated packet,
> > +For example, if the encapsulated packets \hyperref[intro:GRE]{[GRE]},
> > +\hyperref[intro:VXLAN]{[VXLAN]} and \hyperref[intro:GENEVE]{[GENEVE]} are
> > hashed in inner
> > +headers, then \field{hash_tunnel_types} should be set to
> > VIRTIO_NET_HASH_TUNNEL_TYPE_{GRE, VXLAN, GENEVE}
> > +respectively, and \field{hash_report_tunnel_types} should be respectively
> > set to
> > +VIRTIO_NET_HASH_TUNNEL_REPORT_{GRE, VXLAN, GENEVE}.
> > +
> > +If VIRTIO_NET_F_HASH_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 type. \field{hash_report_tunnel_types} is no longer valid.
> > +
> > \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 +3932,24 @@ \subsubsection{Processing of Incoming
> > Packets}\label{sec:Device Types / Network
> > #define VIRTIO_NET_HASH_TYPE_UDP_EX (1 << 8)
> > \end{lstlisting}
> > +\subparagraph{Supported/enabled tunnel hash types}
> > +\label{sec:Device Types / Network Device / Device Operation / Processing
> > of Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled tunnel hash types}
> > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated, the encapsulation
> > +hash type indicates that the hash is calculated over the inner header of
> > +the encapsulated packet:
> > +Hash type applicable for inner payload of the gre-encapsulated packet
> > +\begin{lstlisting}
> > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_GRE (1 << 0)
> > +\end{lstlisting}
> > +Hash type applicable for inner payload of the vxlan-encapsulated packet
> > +\begin{lstlisting}
> > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_VXLAN (1 << 1)
> > +\end{lstlisting}
> > +Hash type applicable for inner payload of the geneve-encapsulated packet
> > +\begin{lstlisting}
> > +#define VIRTIO_NET_HASH_TUNNEL_TYPE_GENEVE (1 << 2)
> > +\end{lstlisting}
> > +
> > \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 +4041,26 @@ \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 hash calculation of an encapsulated packet}
> > +If the feature VIRTIO_NET_F_HASH_TUNNEL is negotiated and the corresponding
> > +encapsulation hash type is set in \field{hash_tunnel_types}, the device
> > calculates the
> > +hash on the inner header of an encapsulated packet (See \ref{sec:Device
> > Types
> > +/ Network Device / Device Operation / Processing of Incoming Packets /
> > +Hash calculation for incoming packets / Tunnel/Encapsulated packet}), and
> > +\field{hash_report_tunnel_types} contains the valid outer tunnel type.
> > +
> > \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_types} with the report type of the encapsulated
> > packet,
> > +and it is set to VIRTIO_NET_HASH_TUNNEL_REPORT_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_types} to
> > VIRTIO_NET_HASH_TUNNEL_REPORT_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 +4082,26 @@ \subsubsection{Processing of Incoming
> > Packets}\label{sec:Device Types / Network
> > #define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9
> > \end{lstlisting}
> > +\field{hash_report_tunnel} can report the type of the encapsulated
> > +packet to the driver when the inner header hash is calculated.
> > +Possible values that the device can report in
> > \field{hash_report_tunnel_types}
> > +are defined below.
> > +They correspond to supported hash tunnel types defined in
> > +\ref{sec:Device Types / Network Device / Device Operation / Processing of
> > Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash tunnel types}
> > +as follows:
> > +
> > +VIRTIO_NET_HASH_TUNNEL_TYPE_XXX = 1 << (VIRTIO_NET_HASH_TUNNEL_REPORT_XXX
> > -1)
> > +
> > +\begin{lstlisting}
> > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_NONE 0
> > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_GRE 1
> > +#define VIRTIO_NET_HASH_TUNNEL_REPORT_VXLAN 2
> > +#define VIRTIO_NET_HASH_TUNNEL_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
> > @@ -4364,6 +4461,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> > Types / Network Device / Devi
> > \begin{lstlisting}
> > struct virtio_net_hash_config {
> > le32 hash_types;
> > + le32 hash_tunnel_types;
> > le16 reserved[4];
> > u8 hash_key_length;
> > u8 hash_key_data[hash_key_length];
> > @@ -4372,7 +4470,12 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> > Types / Network Device / Devi
> > Field \field{hash_types} contains a bitmask of allowed hash types as
> > defined in
> > \ref{sec:Device Types / Network Device / Device Operation / Processing of
> > Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash types}.
> > -Initially the device has all hash types disabled and reports only
> > VIRTIO_NET_HASH_REPORT_NONE.
> > +
> > +Field \field{hash_tunnel_types} contains a bitmask of allowed hash tunnel
> > types as
> > +defined in \ref{sec:Device Types / Network Device / Device Operation /
> > Processing of Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash tunnel types}.
> > +
> > +Initially the device has all hash types and hash tunnel types disabled and
> > reports only
> > +VIRTIO_NET_HASH_REPORT_NONE and VIRTIO_NET_HASH_TUNNEL_REPORT_NONE
> > respectively.
> > Field \field{reserved} MUST contain zeroes. It is defined to make the
> > structure to match the layout of virtio_net_rss_config structure,
> > defined in \ref{sec:Device Types / Network Device / Device Operation /
> > Control Virtqueue / Receive-side scaling (RSS)}.
> > @@ -4390,6 +4493,7 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> > Types / Network Device / Devi
> > \begin{lstlisting}
> > struct virtio_net_rss_config {
> > le32 hash_types;
> > + le32 hash_tunnel_types;
> > le16 indirection_table_mask;
> > le16 unclassified_queue;
> > le16 indirection_table[indirection_table_length];
> > @@ -4402,6 +4506,9 @@ \subsubsection{Control Virtqueue}\label{sec:Device
> > Types / Network Device / Devi
> > defined in
> > \ref{sec:Device Types / Network Device / Device Operation / Processing of
> > Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash types}.
> > +Field \field{hash_tunnel_types} contains a bitmask of allowed hash tunnel
> > types as
> > +defined in \ref{sec:Device Types / Network Device / Device Operation /
> > Processing of Incoming Packets / Hash calculation for incoming packets /
> > Supported/enabled hash tunnel types}.
> > +
> > Field \field{indirection_table_mask} is a mask to be applied to
> > the calculated hash to produce an index in the
> > \field{indirection_table} array.
> > 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}
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