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Subject: [PATCH] virtio_net: support inner header hash for GRE-encapsulated packets
From: Heng Qi <henqqi@linux.alibaba.com>
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_HASH_TYPE_GRE_INNER bitmask in \field{hash_types},
which instructs the device to calculate the hash using the inner
headers of GRE-encapsulated packets.
Signed-off-by: Heng Qi <henqqi@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
v1:
1. Remove the patch for the bitmask fix. @Michael S. Tsirkin
2. Clarify some paragraphs. @Jason Wang
content.tex | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
diff --git a/content.tex b/content.tex
index e863709..f0b3fe2 100644
--- a/content.tex
+++ b/content.tex
@@ -3883,6 +3883,10 @@ \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}
\subparagraph{IPv4 packets}
\label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / IPv4 packets}
@@ -3975,6 +3979,117 @@ \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-encapsulated packets}
+\label{sec:Device Types / Network Device / Device Operation / Processing of Incoming Packets / Hash calculation for incoming packets / Inner payloads of GRE-encapsulated packets}}
+VIRTIO_NET_HASH_TYPE_GRE_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-encapsulated packets whose inner payloads
+are IPv4 packets according to 'Enabled hash types' bitmasks as follows:
+\begin{itemize}
+ \item If both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_TCPv4 bits
+ are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_UDPv4
+ bits are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_IPv4
+ bits are 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}
+
+The device calculates the hash on GRE-encapsulated packets whose inner payloads
+are IPv6 packets without extension headers according to 'Enabled hash types'
+bitmasks as follows:
+\begin{itemsize}
+ \item If both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_TCPv6
+ bits are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_UDPv6
+ bits are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_IPv6
+ bits are 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}
+
+The device calculates the hash on GRE-encapsulated packets whose inner payloads
+are IPv6 packets with extension headers according to 'Enabled hash types'
+bitmasks as follows:
+\begin{itemsize}
+ \item If both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_TCP_EX
+ bits are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_UDP_EX
+ bits are set, and the GRE-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 both VIRTIO_NET_HASH_TYPE_GRE_INNER and VIRTIO_NET_HASH_TYPE_IP_EX
+ bits are 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 inner IPv6 extension headers and calculate the hash as defined
+ for a GRE-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}
@@ -4005,6 +4120,10 @@ \subsubsection{Processing of Incoming Packets}\label{sec:Device Types / Network
#define VIRTIO_NET_HASH_REPORT_UDPv6_EX 9
\end{lstlisting}
+VIRTIO_NET_HASH_TYPE_GRE_INNER bit is not included in \field{hash_report},
+it just indicates that the hash is calculated using the inner header inside
+the GRE-encapsulated packet.
+
\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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