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Subject: Re: [virtio-comment] [PATCH v2] virtio-net: support the outer source port hash for UDP-encapsulated packets
å 2023/9/26 äå4:28, Heng Qi åé:
UDP tunneling protocols typically employ the outer source UDP port as a means
to identify a flow, which proves beneficial for handling UDP-encapsulated
packets. This functionality can be used in scenarios where the flow undergoes
IP address changes when traversing diverse tunnels. Henceforth, we propose
extending it as a new RSS configuration.
Signed-off-by: Heng Qi <hengqi@linux.alibaba.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
v1->v2:
1. Addressing Michael's comments regarding some descriptions.
Hi Michael. Do you have any comments on this? Thanks!
device-types/net/description.tex | 53 ++++++++++++++++++++++++- device-types/net/device-conformance.tex | 1 + 2 files changed, 52 insertions(+), 2 deletions(-) diff --git a/device-types/net/description.tex b/device-types/net/description.tex index 76585b0..2220b70 100644 --- a/device-types/net/description.tex +++ b/device-types/net/description.tex @@ -88,6 +88,9 @@ \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_UDP_TUNNEL_SRCPORT(50)] Device supports outer source port hash+ for UDP-encapsulated packets. + \item[VIRTIO_NET_F_HASH_TUNNEL(51)] Device supports inner header hash for encapsulated packets.\item[VIRTIO_NET_F_VQ_NOTF_COAL(52)] Device supports virtqueue notification coalescing.@@ -150,6 +153,7 @@ \subsubsection{Feature bit requirements}\label{sec:Device Types / Network Device \item[VIRTIO_NET_F_RSS] Requires VIRTIO_NET_F_CTRL_VQ. \item[VIRTIO_NET_F_VQ_NOTF_COAL] Requires VIRTIO_NET_F_CTRL_VQ. \item[VIRTIO_NET_F_HASH_TUNNEL] Requires VIRTIO_NET_F_CTRL_VQ along with VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT. +\item[VIRTIO_NET_F_HASH_UDP_TUNNEL_SRCPORT] Requires VIRTIO_NET_F_CTRL_VQ along with VIRTIO_NET_F_RSS or VIRTIO_NET_F_HASH_REPORT. \end{description}\subsubsection{Legacy Interface: Feature bits}\label{sec:Device Types / Network Device / Feature bits / Legacy Interface: Feature bits}@@ -927,11 +931,29 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network #define VIRTIO_NET_HASH_TYPE_UDP_EX (1 << 8) \end{lstlisting}+A UDP-encapsulated packet uses UDP as the transport protocol in the outer header+\ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Encapsulated packet}. +UDP tunneling protocols usually use the outer source UDP port to identify a specific flow. + +If additionally the feature VIRTIO_NET_F_HASH_UDP_TUNNEL_SRCPORT was negotiated, +the following hash types are applicable for UDP-encapsulated packets: +\begin{lstlisting} +#define VIRTIO_NET_HASH_TYPE_UDPv4_TUNNEL_SRCPORT (1 << 9) +#define VIRTIO_NET_HASH_TYPE_UDPv6_TUNNEL_SRCPORT (1 << 10) +\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: \begin{itemize} -\item If VIRTIO_NET_HASH_TYPE_TCPv4 is set and the packet has +\item If additionally VIRTIO_NET_HASH_TYPE_UDPv4_TUNNEL_SRCPORT is set and a received encapsulated +packet \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / +Hash calculation for incoming packets / Encapsulated packet} has an outer UDPv4 header, the hash +is calculated over the following fields: +\begin{itemize} +\item Outer source UDP port +\end{itemize} +\item Else if VIRTIO_NET_HASH_TYPE_TCPv4 is set and the packet has a TCP header, the hash is calculated over the following fields: \begin{itemize} \item Source IP address @@ -961,7 +983,14 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network The device calculates the hash on IPv6 packets without extension headers according to 'Enabled hash types' bitmask as follows: \begin{itemize} -\item If VIRTIO_NET_HASH_TYPE_TCPv6 is set and the packet has +\item If additionally VIRTIO_NET_HASH_TYPE_UDPv6_TUNNEL_SRCPORT is set and a received encapsulated +packet \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / +Hash calculation for incoming packets / Encapsulated packet} has an outer UDPv6 header, the hash +is calculated over the following fields: +\begin{itemize} +\item Outer source UDP port +\end{itemize} +\item Else if VIRTIO_NET_HASH_TYPE_TCPv6 is set and the packet has a TCPv6 header, the hash is calculated over the following fields: \begin{itemize} \item Source IPv6 address @@ -991,6 +1020,13 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network The device calculates the hash on IPv6 packets with extension headers according to 'Enabled hash types' bitmask as follows: \begin{itemize} +\item If additionally VIRTIO_NET_HASH_TYPE_UDPv6_TUNNEL_SRCPORT is set and a received encapsulated +packet \ref{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / +Hash calculation for incoming packets / Encapsulated packet} has an outer UDPv6 header, the hash +is calculated over the following fields: +\begin{itemize} +\item Outer source UDP port +\end{itemize} \item If VIRTIO_NET_HASH_TYPE_TCP_EX is set and the packet has a TCPv6 header, the hash is calculated over the following fields: \begin{itemize} @@ -1139,8 +1175,21 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network #define VIRTIO_NET_HASH_REPORT_IPv6_EX 7 #define VIRTIO_NET_HASH_REPORT_TCPv6_EX 8 #define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9 +#define VIRTIO_NET_HASH_REPORT_UDPv4_TUNNEL_SRCPORT 10 /* Only if additionally VIRTIO_NET_F_HASH_UDP_TUNNEL_SRCPORT was negotiated */ +#define VIRTIO_NET_HASH_REPORT_UDPv6_TUNNEL_SRCPORT 11 /* Only if additionally VIRTIO_NET_F_HASH_UDP_TUNNEL_SRCPORT was negotiated */ \end{lstlisting}+\devicenormative{\subparagraph}{Outer Source UDP Port}{Device Types / Network Device / Device Operation / Outer Source UDP Port}+ +When all the following cases occur: +\begin{itemize} +\item Both VIRTIO_NET_F_HASH_UDP_TUNNEL_SRCPORT and VIRTIO_NET_F_HASH_TUNNEL are negotiated. +\item A received UDP-encapsulated packet's outer header matches one of the encapsulation types enabled in \field{enabled_tunnel_types}. +\item VIRTIO_NET_HASH_TYPE_UDPv4_TUNNEL_SRCPORT is set in \field{hash_types} and a received encapsulated packet has an outer UDPv4 header or + VIRTIO_NET_HASH_TYPE_UDPv6_TUNNEL_SRCPORT is set in \field{hash_types} and a received encapsulated packet has an outer UDPv6 header. +\end{itemize} +the device MUST calculate the hash over the inner header rather than the outer source UDP port. + \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 isdiff --git a/device-types/net/device-conformance.tex b/device-types/net/device-conformance.tex index f88f48b..4fd036b 100644 --- a/device-types/net/device-conformance.tex +++ b/device-types/net/device-conformance.tex @@ -7,6 +7,7 @@ \item \ref{devicenormative:Device Types / Network Device / Device Operation / Packet Transmission} \item \ref{devicenormative:Device Types / Network Device / Device Operation / Setting Up Receive Buffers} \item \ref{devicenormative:Device Types / Network Device / Device Operation / Processing of Incoming Packets} +\item \ref{devicenormative:Device Types / Network Device / Device Operation / Outer Source UDP Port} \item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Packet Receive Filtering} \item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / Setting MAC Address Filtering} \item \ref{devicenormative:Device Types / Network Device / Device Operation / Control Virtqueue / VLAN Filtering}
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