Signed-off-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---
doc/guides/prog_guide/packet_classif_access_ctrl.rst | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/doc/guides/prog_guide/packet_classif_access_ctrl.rst
b/doc/guides/prog_guide/packet_classif_access_ctrl.rst
index e018c68..d2adbff 100644
--- a/doc/guides/prog_guide/packet_classif_access_ctrl.rst
+++ b/doc/guides/prog_guide/packet_classif_access_ctrl.rst
@@ -269,6 +269,22 @@ When creating a set of rules, for each rule, additional
information must be supp
When adding new rules into an ACL context, all fields must be in host byte
order (LSB).
When the search is performed for an input tuple, all fields in that tuple
must be in network byte order (MSB).
+Classification methods
+~~~~~~~~~~~~~~~~~~~~~~
+
+After rte_acl_build() over given ACL context has finished successfully, it can
be used to perform classification - search for a ACL rule with highest priority
over the input data.
+There are several implementations of classify algorithm:
+
+* **RTE_ACL_CLASSIFY_SCALAR**: generic implementation, doesn't require any
specific HW support.
+
+* **RTE_ACL_CLASSIFY_SSE**: vector implementation, can process up to 8 flows
in parallel. Requires SSE 4.1 support.
+
+* **RTE_ACL_CLASSIFY_AVX2**: vector implementation, can process up to 16
flows in parallel. Requires AVX2 support.
+
+It is purely a runtime decision which method to choose, there is no build-time
difference.
+All implementations operates over the same internal RT structures and use
similar principles. The main difference is that vector implementations can
manually exploit IA SIMD instructions and process several input data flows in
parallel.
+At startup ACL library determines the highest available classify method for
the given platform and sets it as default one. Though the user has an ability
to override the default classifier function for a given ACL context or perform
particular search using non-default classify method. In that case it is user
responsibility to make sure that given platform supports selected classify
implementation.
+
Application Programming Interface (API) Usage
---------------------------------------------
--
1.8.3.1
