Feature arc represents an ordered list of features/protocols at a given networking layer. It is a high level abstraction to connect various rte_graph nodes, as feature nodes, and allow packets steering across these nodes in a generic manner.
Features (or feature nodes) are nodes which handles partial or complete handling of a protocol in fast path. Like ipv4-rewrite node, which adds rewrite data to an outgoing IPv4 packet. However in above example, outgoing interface(say "eth0") may have outbound IPsec policy enabled, hence packets must be steered from ipv4-rewrite node to ipsec-outbound-policy node for outbound IPsec policy lookup. On the other hand, packets routed to another interface (eth1) will not be sent to ipsec-outbound-policy node as IPsec feature is disabled on eth1. Feature-arc allows rte_graph applications to manage such constraints easily Feature arc abstraction allows rte_graph based application to 1. Seamlessly steer packets across feature nodes based on whether feature is enabled or disabled on an interface. Features enabled on one interface may not be enabled on another interface with in a same feature arc. 2. Allow enabling/disabling of features on an interface at runtime, so that if a feature is disabled, packets associated with that interface won't be steered to corresponding feature node. 3. Provides mechanism to hook custom/user-defined nodes to a feature node and allow packet steering from feature node to custom node without changing former's fast path function 4. Allow expressing features in a particular sequential order so that packets are steered in an ordered way across nodes in fast path. For eg: if IPsec and IPv4 features are enabled on an ingress interface, packets must be sent to IPsec inbound policy node first and then to ipv4 lookup node. This patch series adds feature arc library in rte_graph and also adds "ipv4-output" feature arc handling in "ipv4-rewrite" node. Changes in v2: - Added unit tests for feature arc - Fixed issues found in testing - Added new public APIs rte_graph_feature_arc_feature_to_node(), rte_graph_feature_arc_feature_to_name(), rte_graph_feature_arc_num_features() - Added programming guide for feature arc - Added release notes for feature arc Nitin Saxena (5): graph: add feature arc support graph: add feature arc option in graph create graph: add IPv4 output feature arc test/graph_feature_arc: add functional tests docs: add programming guide for feature arc app/test/meson.build | 1 + app/test/test_graph_feature_arc.c | 1415 +++++++++++++++++++ doc/guides/prog_guide/graph_lib.rst | 289 ++++ doc/guides/prog_guide/img/feature_arc-1.jpg | Bin 0 -> 48984 bytes doc/guides/prog_guide/img/feature_arc-2.jpg | Bin 0 -> 113287 bytes doc/guides/prog_guide/img/feature_arc-3.jpg | Bin 0 -> 93408 bytes doc/guides/rel_notes/release_24_11.rst | 11 +- lib/graph/graph.c | 1 + lib/graph/graph_feature_arc.c | 1223 ++++++++++++++++ lib/graph/graph_populate.c | 7 +- lib/graph/graph_private.h | 3 + lib/graph/meson.build | 2 + lib/graph/node.c | 2 + lib/graph/rte_graph.h | 3 + lib/graph/rte_graph_feature_arc.h | 429 ++++++ lib/graph/rte_graph_feature_arc_worker.h | 672 +++++++++ lib/graph/version.map | 20 + lib/node/ip4_rewrite.c | 476 +++++-- lib/node/ip4_rewrite_priv.h | 15 +- lib/node/node_private.h | 20 +- lib/node/rte_node_ip4_api.h | 3 + 21 files changed, 4493 insertions(+), 99 deletions(-) create mode 100644 app/test/test_graph_feature_arc.c create mode 100644 doc/guides/prog_guide/img/feature_arc-1.jpg create mode 100644 doc/guides/prog_guide/img/feature_arc-2.jpg create mode 100644 doc/guides/prog_guide/img/feature_arc-3.jpg create mode 100644 lib/graph/graph_feature_arc.c create mode 100644 lib/graph/rte_graph_feature_arc.h create mode 100644 lib/graph/rte_graph_feature_arc_worker.h -- 2.43.0
