From: Nitin Saxena <nsaxena@marvell.com>
To: Jerin Jacob <jerinj@marvell.com>,
Kiran Kumar K <kirankumark@marvell.com>,
Nithin Dabilpuram <ndabilpuram@marvell.com>,
Zhirun Yan <yanzhirun_163@163.com>,
Robin Jarry <rjarry@redhat.com>,
Christophe Fontaine <cfontain@redhat.com>
Cc: <dev@dpdk.org>, Nitin Saxena <nsaxena16@gmail.com>
Subject: [PATCH v5 5/5] docs: add programming guide for feature arc
Date: Mon, 14 Oct 2024 20:03:58 +0530 [thread overview]
Message-ID: <20241014143401.3135897-6-nsaxena@marvell.com> (raw)
In-Reply-To: <20241014143401.3135897-1-nsaxena@marvell.com>
Updated graph library guide with feature arc
Signed-off-by: Nitin Saxena <nsaxena@marvell.com>
---
doc/guides/prog_guide/graph_lib.rst | 288 +++++++++++
doc/guides/prog_guide/img/feature_arc-1.svg | 277 +++++++++++
doc/guides/prog_guide/img/feature_arc-2.svg | 511 ++++++++++++++++++++
doc/guides/prog_guide/img/feature_arc-3.svg | 318 ++++++++++++
4 files changed, 1394 insertions(+)
create mode 100644 doc/guides/prog_guide/img/feature_arc-1.svg
create mode 100644 doc/guides/prog_guide/img/feature_arc-2.svg
create mode 100644 doc/guides/prog_guide/img/feature_arc-3.svg
diff --git a/doc/guides/prog_guide/graph_lib.rst b/doc/guides/prog_guide/graph_lib.rst
index ad09bdfe26..d98b48b0e5 100644
--- a/doc/guides/prog_guide/graph_lib.rst
+++ b/doc/guides/prog_guide/graph_lib.rst
@@ -547,3 +547,291 @@ on success packet is enqueued to ``udp4_input`` node.
Hash lookup is performed in ``udp4_input`` node with registered destination port
and destination port in UDP packet , on success packet is handed to ``udp_user_node``.
+
+Feature Arc
+-----------
+`Feature arc` represents an ordered list of `protocols/features` at a given
+networking layer. It is a high level abstraction to connect various `feature`
+nodes in `rte_graph` instance and allows seamless packets steering based on the
+sequence of enabled features at runtime on each interface.
+
+`Features` (or feature nodes) are nodes which handle partial or complete
+protocol processing in a given direction. For instance, `ipv4-rewrite` and
+`IPv4 IPsec encryption` are outbound features while `ipv4-lookup` and `IPv4
+IPsec decryption` are inbound features. Further, `ipv4-rewrite` and `IPv4
+IPsec encryption` can collectively represent a `feature arc` towards egress
+direction with ordering constraints that `IPv4 IPsec encryption` must be
+performed before `ipv4-rewrite`. Similarly, `IPv4 IPsec decryption` and
+`ipv4-lookup` can represent a `feature arc` in an ingress direction. Both of
+these `feature arc` can co-exist at an IPv4 layer in egress and ingress
+direction respectively.
+
+A `feature` can be represented by a single node or collection of multiple nodes
+performing feature processing collectively.
+
+.. figure:: img/feature_arc-1.*
+ :alt: feature-arc-1
+ :width: 350px
+ :align: center
+
+ Feature Arc overview
+
+Each `feature arc` is associated with a `Start` node from which all features in
+a feature arc are connected. A `start` node itself is not a `feature` node but
+it is where `first enabled feature` is checked in fast path. In above figure,
+`Node-A` represents a `start node`. There may be a `Sink` node as well which
+is child node for every feature in an arc. 'Sink` node is responsible of
+consuming those packets which are not consumed by intermediate enabled features
+between `start` and `sink` node. `Sink` node, if present, is the last enabled
+feature in a feature arc. A `feature` node statically connected to `start` node
+must also be added via feature arc API, `rte_graph_feature_add()``. Here `Node-B`
+acts as a `sink` node which is statically linked to `Node A`. `Feature` nodes
+are connected via `rte_graph_feature_add()` which takes care of connecting
+all `feature` nodes with each other and start node.
+
+.. code-block:: bash
+ :linenos:
+ :emphasize-lines: 8
+ :caption: Node-B statically linked to Node-A
+
+ static struct rte_node_register node_A_node = {
+ .process = node_A_process_func,
+ ...
+ ...
+ .name = "Node-A",
+ .next_nodes =
+ {
+ [0] = "Node-B",
+ },
+ .nb_edges = 1,
+ };
+
+When multiple features are enabled on an interface, it may be required to steer
+packets across `features` in a given order. For instance, if `Feature 1` and
+`Feature 2` both are enabled on an interface ``X``, it may be required to send
+packets to `Feature-1` before `Feature-2`. Such ordering constraints can be
+easily expressed with `feature arc`. In this case, `Feature 1` is called as
+``First Feature`` and `Feature 2` is called as ``Next Feature`` to `Feature 1`.
+
+.. figure:: img/feature_arc-2.*
+ :alt: feature-arc-2
+ :width: 600px
+ :align: center
+
+ First and Next features and their ordering
+
+In similar manner, even application specific ``custom features`` can be hooked
+to standard nodes. It is to be noted that this `custom feature` hooking to
+`feature arc` aware node does not require any code changes.
+
+It may be obvious by now that `features` enabled on one interface does not
+affect packets on other interfaces. In above example, if no feature is
+enabled on an interface ``X``, packets destined to interface ``X`` would be
+directly sent to `Node-B` from `Node-A`.
+
+.. figure:: img/feature_arc-3.*
+ :alt: feature-arc-3
+ :width: 550px
+ :align: center
+
+ Feature-2 consumed/non-consumed packet path
+
+When a `Feature-X` node receives packets via feature arc, it may decide whether
+to ``consume packet`` or send to `next enabled feature`. A node can consume
+packet by freeing it, sending it on wire or enqueuing it to hardware queue. If a
+packet is not consumed by a `Feature-X` node, it may send to `next enabled
+feature` on an interface. In above figure, `Feature-2` nodes are represented to
+consume packets. Classic example for a node performing consume and non-consume
+operation on packets would be IPsec policy node where all packets with
+``protect`` actions are consumed while remaining packets with ``bypass``
+actions are sent to next enabled feature.
+
+In fast path feature node may require to lookup local data structures for each
+interface. For example, retrieving policy database per interface for IPsec
+processing. ``rte_graph_feature_enable`` API allows to set application
+specific cookie per feature per interface. `Feature data` object maintains this
+cookie in fast path for each interface.
+
+`Feature arc design` allows to enable subsequent features in a control plane
+without stopping workers which are accessing feature arc's fast path APIs in
+``rte_graph_walk()`` context. However for disabling features require RCU like
+scheme for synchronization.
+
+Programming model
+~~~~~~~~~~~~~~~~~
+Feature Arc Objects
+^^^^^^^^^^^^^^^^^^^
+Control plane and fast path APIs deals with following objects:
+
+Feature arc
+***********
+``rte_graph_feature_arc_t`` is a handle to feature arc which is created via
+``rte_graph_feature_arc_create()``. It is a `uint64_t` size object which can be
+saved in feature node's context. This object can be translated to fast path
+feature arc object ``struct rte_graph_feature_arc`` which is an input
+argument to all fast path APIs. Control plane APIs majorly takes
+`rte_graph_feature_arc_t` object as an input.
+
+Feature List
+************
+Each feature arc holds two feature lists: `active` and `passive`. While worker
+cores uses `active` list, control plane APIs uses `passive` list for
+enabling/disabling a feature on any interface with in a arc. After successful
+feature enable/disable, ``rte_graph_feature_enable()``/
+``rte_graph_feature_disable()`` atomically switches passive list to active list
+and vice-versa. Most of the fast path APIs takes active list as an argument
+(``rte_graph_feature_rt_list_t``), which feature node can obtain in start of
+it's `process_func()` via ``rte_graph_feature_arc_has_any_feature()`` (in `start`
+node) or ``rte_graph_feature_arc_has_feature()`` (in next feature nodes).
+
+Each feature list holds RTE_GRAPH_MAX_FEATURES number of features and
+associated feature data for every interface index
+
+Feature
+********
+Feature is a data structure which holds `feature data` object for every
+interface. It is represented via ``rte_graph_feature_t`` which is a `uint8_t`
+size object. Fast path internal structure ``struct rte_graph_feature`` can be
+obtained from ``rte_graph_feature_t`` via ``rte_graph_feature_get()`` API.
+
+In `start` node `rte_graph_feature_arc_first_feature_get()` can be used to get
+first enabled `rte_graph_feature_t` object for an interface. `rte_edge` from
+`start` node to first enabled feature is provided by
+``rte_graph_feature_arc_feature_set()`` API.
+
+In `feature nodes`, next enabled feature is obtained by providing current feature
+as an input to ``rte_graph_feature_arc_next_feature_get()`` API.
+
+Feature data
+************
+Feature data object is maintained per feature per interface which holds
+following information in fast path
+
+- ``rte_edge_t`` to send packet to next enabled feature
+- ``Next enabled feature`` on current interface
+- ``User_data`` per feature per interface set by application via `rte_graph_feature_enable()`
+
+Enabling Feature Arc processing
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+By default, feature arc processing is disabled in `rte_graph_create()`. To
+enable feature arc processing in fast path, `rte_graph_create()` API should be
+invoked with `feature_arc_enable` flag set as `true`
+
+.. code-block:: bash
+ :linenos:
+ :emphasize-lines: 3
+ :caption: Enabling feature are processing in rte_graph_create()
+
+ struct rte_graph_param graph_conf;
+
+ graph_conf.feature_arc_enable = true;
+ struct rte_graph *graph = rte_graph_create("graph_name", &graph_conf);
+
+Further as an optimization technique, `rte_graph_walk()` would call newly added
+``feat_arc_proc()`` node callback function (if non-NULL) instead of
+``process``
+
+.. code-block:: bash
+ :linenos:
+ :emphasize-lines: 3
+ :caption: Feature arc specific node callback function
+
+ static struct rte_node_register ip4_rewrite_node = {
+ .process = ip4_rewrite_node_process,
+ .feat_arc_proc = ip4_rewrite_feature_node_process,
+ .name = "ip4_rewrite",
+ ...
+ ...
+ };
+
+If `feat_arc_proc` is not provided in node registration, `process_func` would
+be called by `rte_graph_walk()`
+
+Sample Usage
+^^^^^^^^^^^^
+.. code-block:: bash
+ :linenos:
+ :caption: Feature arc sample usage
+
+ #define MAX_FEATURES 10
+ #define MAX_INDEXES 5
+
+ static uint16_t
+ feature2_feature_node_process (struct rte_graph *graph, struct
+ rte_node *node, void **objs, uint16_t nb_objs)
+ {
+ /* features may be enabled */
+ }
+ static uint16_t
+ feature2_node_process (struct rte_graph *graph, struct
+ rte_node *node, void **objs, uint16_t nb_objs)
+ {
+ /* Feature arc is disabled in rte_graph_create() */
+ }
+
+ static uint16_t
+ feature2_node_process (struct rte_graph *graph, struct
+ rte_node *node, void **objs, uint16_t nb_objs)
+ {
+ /* Feature arc may be enabled or disabled as this process_func() would
+ * be called for the case when feature arc is enabled in rte_graph_create()
+ * and also the case when it is disabled
+ */
+ }
+
+ static struct rte_node_register feature2_node = {
+ .process = feature2_node_process,
+ .feat_arc_proc = feature2_feature_node_process,
+ .name = "feature2",
+ .init = feature2_init_func,
+ ...
+ ...
+ };
+
+ static struct rte_node_register feature1_node = {
+ .process = feature1_node_process,
+ .feat_arc_proc = NULL,
+ .name = "feature1",
+ ...
+ ...
+ };
+
+ int worker_cb(void *_em)
+ {
+ rte_graph_feature_arc_t arc;
+ uint32_t user_data;
+
+ rte_graph_feature_arc_lookup_by_name("sample_arc", &arc);
+
+ /* From control thread context (like CLII):
+ * Enable feature 2 on interface index 4
+ */
+ if (rte_lcore_id() == rte_get_main_lcore) {
+ user_data = 0x1234;
+ rte_graph_feature_enable(arc, 4 /* interface index */, "feature2", user_data);
+ } else {
+ while(1)
+ rte_graph_walk);
+ }
+ }
+
+ int main(void)
+ {
+ struct rte_graph_param graph_conf;
+ rte_graph_feature_arc_t arc;
+
+ if (rte_graph_feature_arc_create("sample_arc", MAX_FEATURES, MAX_INDEXES, &arc))
+ return -1;
+
+ rte_graph_feature_add(arc, "feature1", NULL, NULL);
+ rte_graph_feature_add(arc, "feature2", "feature1" /* add feature2 after feature 1*/, NULL);
+
+ /* create graph*/
+ ...
+ ...
+ graph_conf.feature_arc_enable = true;
+
+ struct rte_graph *graph = rte_graph_create("sample_graph", &graph_conf);
+
+ rte_eal_mp_remote_launch(worker_cb, arg, CALL_MAIN);
+ }
diff --git a/doc/guides/prog_guide/img/feature_arc-1.svg b/doc/guides/prog_guide/img/feature_arc-1.svg
new file mode 100644
index 0000000000..dada169e11
--- /dev/null
+++ b/doc/guides/prog_guide/img/feature_arc-1.svg
@@ -0,0 +1,277 @@
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--
2.43.0
prev parent reply other threads:[~2024-10-14 14:34 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-07 7:31 [RFC PATCH 0/3] add feature arc in rte_graph Nitin Saxena
2024-09-07 7:31 ` [RFC PATCH 1/3] graph: add feature arc support Nitin Saxena
2024-09-11 4:41 ` Kiran Kumar Kokkilagadda
2024-10-10 4:42 ` Nitin Saxena
2024-09-07 7:31 ` [RFC PATCH 2/3] graph: add feature arc option in graph create Nitin Saxena
2024-09-07 7:31 ` [RFC PATCH 3/3] graph: add IPv4 output feature arc Nitin Saxena
2024-10-08 8:04 ` [RFC PATCH 0/3] add feature arc in rte_graph David Marchand
2024-10-08 14:26 ` [EXTERNAL] " Nitin Saxena
2024-10-14 11:11 ` Nitin Saxena
2024-10-16 9:24 ` David Marchand
2024-10-16 9:38 ` Robin Jarry
2024-10-16 13:50 ` Nitin Saxena
2024-10-17 7:03 ` Nitin Saxena
2024-10-17 7:50 ` Robin Jarry
2024-10-17 8:32 ` [EXTERNAL] " Christophe Fontaine
2024-10-17 10:56 ` Nitin Saxena
2024-10-17 8:48 ` [EXTERNAL] " Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 0/5] " Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 1/5] graph: add feature arc support Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 2/5] graph: add feature arc option in graph create Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 3/5] graph: add IPv4 output feature arc Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 4/5] test/graph_feature_arc: add functional tests Nitin Saxena
2024-10-08 13:30 ` [RFC PATCH v2 5/5] docs: add programming guide for feature arc Nitin Saxena
2024-10-09 13:29 ` [PATCH v3 0/5] add feature arc in rte_graph Nitin Saxena
2024-10-09 13:29 ` [PATCH v3 1/5] graph: add feature arc support Nitin Saxena
2024-10-09 13:29 ` [PATCH v3 2/5] graph: add feature arc option in graph create Nitin Saxena
2024-10-09 13:30 ` [PATCH v3 3/5] graph: add IPv4 output feature arc Nitin Saxena
2024-10-09 13:30 ` [PATCH v3 4/5] test/graph_feature_arc: add functional tests Nitin Saxena
2024-10-09 13:30 ` [PATCH v3 5/5] docs: add programming guide for feature arc Nitin Saxena
2024-10-09 14:21 ` [PATCH v3 0/5] add feature arc in rte_graph Christophe Fontaine
2024-10-10 4:13 ` [EXTERNAL] " Nitin Saxena
2024-10-09 17:37 ` Stephen Hemminger
2024-10-10 4:24 ` [EXTERNAL] " Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 " Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 1/5] graph: add feature arc support Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 2/5] graph: add feature arc option in graph create Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 3/5] graph: add IPv4 output feature arc Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 4/5] test/graph_feature_arc: add functional tests Nitin Saxena
2024-10-10 13:31 ` [PATCH v4 5/5] docs: add programming guide for feature arc Nitin Saxena
2024-10-14 14:33 ` [PATCH v5 0/5] add feature arc in rte_graph Nitin Saxena
2024-10-14 14:33 ` [PATCH v5 1/5] graph: add feature arc support Nitin Saxena
2024-10-14 14:33 ` [PATCH v5 2/5] graph: add feature arc option in graph create Nitin Saxena
2024-10-14 14:33 ` [PATCH v5 3/5] graph: add IPv4 output feature arc Nitin Saxena
2024-10-14 14:33 ` [PATCH v5 4/5] test/graph_feature_arc: add functional tests Nitin Saxena
2024-10-14 19:54 ` Stephen Hemminger
2024-10-14 14:33 ` Nitin Saxena [this message]
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