@@ -214,3 +214,40 @@ implementation ::
Compile OVS in debug mode to have `ovs_assert` statements error out if
there is a mis-match in the DPCLS lookup implementation.
+
+Datapath Interface Performance
+------------------------------
+
+The datapath interface (DPIF) or dp_netdev_input() is responsible for taking
+packets through the major components of the userspace datapath; such as
+miniflow_extract, EMC, SMC and DPCLS lookups, and a lot of the performance
+stats associated with the datapath.
+
+Just like with the SIMD DPCLS work above, SIMD can be applied to the DPIF to
+improve performance.
+
+OVS provides multiple implementations of the DPIF. These can be listed with the
+following command ::
+
+ $ ovs-appctl dpif-netdev/dpif-get
+ Available DPIF implementations:
+ dpif_scalar
+ dpif_avx512
+
+By default, dpif_scalar is used. The DPIF implementation can be selected by
+name ::
+
+ $ ovs-appctl dpif-netdev/dpif-set dpif_avx512
+ DPIF implementation set to dpif_avx512.
+
+ $ ovs-appctl dpif-netdev/dpif-set dpif_scalar
+ DPIF implementation set to dpif_scalar.
+
+Running Unit Tests with AVX512 DPIF
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Since the AVX512 DPIF is disabled by default, a compile time option is
+available in order to test it with the OVS unit test suite. When building with
+a CPU that supports AVX512, use the following configure option ::
+
+ $ ./configure --enable-dpif-default-avx512
@@ -9,6 +9,10 @@ Post-v2.15.0
* New option '--no-record-hostname' to disable hostname configuration
in ovsdb on startup.
* New command 'record-hostname-if-not-set' to update hostname in ovsdb.
+ * Refactor lib/dpif-netdev.c to multiple header files.
+ * Add avx512 implementation of dpif which can process non recirculated
+ packets. It supports partial HWOL, EMC, SMC and DPCLS lookups.
+ * Add commands to get and set the dpif implementations.
v2.15.0 - 15 Feb 2021
This section details how two new commands can be used to list and select the different dpif implementations. It also details how a non default dpif implementation can be tested with the OVS unit test suite. Add NEWS updates for the dpif-netdev.c refactor and the new dpif implementations/commands. Signed-off-by: Cian Ferriter <cian.ferriter@intel.com> --- v8: - Merge NEWS file items into one Userspace Datapath: heading --- Documentation/topics/dpdk/bridge.rst | 37 ++++++++++++++++++++++++++++ NEWS | 4 +++ 2 files changed, 41 insertions(+)