[dpdk-dev] [PATCH v3 3/3] doc: update for conntrack

[Bing Zhao <bingz@nvidia.com>]

The updated documentations include:
  1. Release notes
  2. rte_flow.rst
  3. testpmd user guide

Signed-off-by: Bing Zhao <bingz@nvidia.com>
---
 doc/guides/prog_guide/rte_flow.rst          | 113 ++++++++++++++++++++
 doc/guides/rel_notes/release_21_05.rst      |   4 +
 doc/guides/testpmd_app_ug/testpmd_funcs.rst |  35 ++++++
 3 files changed, 152 insertions(+)

diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
index 2ecc48cfff..a1333819fc 100644
--- a/doc/guides/prog_guide/rte_flow.rst
+++ b/doc/guides/prog_guide/rte_flow.rst
@@ -1398,6 +1398,14 @@ Matches a eCPRI header.
 - ``hdr``: eCPRI header definition (``rte_ecpri.h``).
 - Default ``mask`` matches nothing, for all eCPRI messages.
 
+Item: ``CONNTRACK``
+^^^^^^^^^^^^^^^^^^^
+
+Matches a conntrack state after conntrack action.
+
+- ``flags``: conntrack packet state flags.
+- Default ``mask`` matches all state bits.
+
 Actions
 ~~~~~~~
 
@@ -2842,6 +2850,111 @@ for ``RTE_FLOW_FIELD_VALUE`` and ``RTE_FLOW_FIELD_POINTER`` respectively.
    | ``value``     | immediate value or a pointer to this value               |
    +---------------+----------------------------------------------------------+
 
+Action: ``CONNTRACK``
+^^^^^^^^^^^^^^^^^^^^^
+
+Create a conntrack (connection tracking) context with the provided information.
+
+In stateful session like TCP, the conntrack action provides the ability to
+examine every packet of this connection and associate the state to every
+packet. It will help to realize the stateful offloading with little software
+participation. For example, only the control packets like SYN / FIN or packets
+with invalid state should be handled by the software.
+
+A conntrack context should be created via ``rte_flow_action_handle_create()``
+before using. Then the handle with ``INDIRECT`` type is used for a flow rule
+creation. If a flow rule with an opposite direction needs to be created, the
+``rte_flow_action_handle_update()`` should be used to modify the direction.
+
+Not all the fields of the ``struct rte_flow_action_conntrack`` will be used
+for a conntrack context creating, depending on the HW.
+The ``struct rte_flow_modify_conntrack`` should be used for an updating.
+
+The current conntrack context information could be queried via the
+``rte_flow_action_handle_query()`` interface.
+
+.. _table_rte_flow_action_conntrack:
+
+.. table:: CONNTRACK
+
+   +--------------------------+-------------------------------------------------------------+
+   | Field                    | Value                                                       |
+   +==========================+=============================================================+
+   | ``peer_port``            | peer port number                                            |
+   +--------------------------+-------------------------------------------------------------+
+   | ``is_original_dir``      | direction of this connection for flow rule creating         |
+   +--------------------------+-------------------------------------------------------------+
+   | ``enable``               | enable the conntrack context                                |
+   +--------------------------+-------------------------------------------------------------+
+   | ``live_connection``      | one ack was seen for this connection                        |
+   +--------------------------+-------------------------------------------------------------+
+   | ``selective_ack``        | SACK enabled                                                |
+   +--------------------------+-------------------------------------------------------------+
+   | ``challenge_ack_passed`` | a challenge ack has passed                                  |
+   +--------------------------+-------------------------------------------------------------+
+   | ``last_direction``       | direction of the last passed packet                         |
+   +--------------------------+-------------------------------------------------------------+
+   | ``liberal_mode``         | only report state change                                    |
+   +--------------------------+-------------------------------------------------------------+
+   | ``state``                | current state                                               |
+   +--------------------------+-------------------------------------------------------------+
+   | ``max_ack_window``       | maximal window scaling factor                               |
+   +--------------------------+-------------------------------------------------------------+
+   | ``retransmission_limit`` | maximal retransmission times                                |
+   +--------------------------+-------------------------------------------------------------+
+   | ``original_dir``         | TCP parameters of the original direction                    |
+   +--------------------------+-------------------------------------------------------------+
+   | ``reply_dir``            | TCP parameters of the reply direction                       |
+   +--------------------------+-------------------------------------------------------------+
+   | ``last_window``          | window value of the last passed packet                      |
+   +--------------------------+-------------------------------------------------------------+
+   | ``last_seq``             | sequence value of the last passed packet                    |
+   +--------------------------+-------------------------------------------------------------+
+   | ``last_ack``             | acknowledgement value the last passed packet                |
+   +--------------------------+-------------------------------------------------------------+
+   | ``last_end``             | sum acknowledgement and length value the last passed packet |
+   +--------------------------+-------------------------------------------------------------+
+
+.. _table_rte_flow_tcp_dir_param:
+
+.. table:: configuration parameters for each direction
+
+   +---------------------+---------------------------------------------------------+
+   | Field               | Value                                                   |
+   +=====================+=========================================================+
+   | ``scale``           | TCP window scaling factor                               |
+   +---------------------+---------------------------------------------------------+
+   | ``close_initiated`` | FIN sent from this direction                            |
+   +---------------------+---------------------------------------------------------+
+   | ``last_ack_seen``   | an ACK packet received                                  |
+   +---------------------+---------------------------------------------------------+
+   | ``data_unacked``    | unacknowledged data for packets from this direction     |
+   +---------------------+---------------------------------------------------------+
+   | ``sent_end``        | max{seq + len} seen in sent packets                     |
+   +---------------------+---------------------------------------------------------+
+   | ``reply_end``       | max{sack + max{win, 1}} seen in reply packets           |
+   +---------------------+---------------------------------------------------------+
+   | ``max_win``         | max{max{win, 1}} + {sack - ack} seen in sent packets    |
+   +---------------------+---------------------------------------------------------+
+   | ``max_ack``         | max{ack} + seen in sent packets                         |
+   +---------------------+---------------------------------------------------------+
+
+.. _table_rte_flow_modify_conntrack:
+
+.. table:: update a conntrack context
+
+   +----------------+---------------------------------------+
+   | Field          | Value                                 |
+   +================+=======================================+
+   | ``new_ct``     | new conntrack information             |
+   +----------------+---------------------------------------+
+   | ``direction``  | direction will be updated             |
+   +----------------+---------------------------------------+
+   | ``state``      | other fields except will be updated   |
+   +----------------+---------------------------------------+
+   | ``reserved``   | reserved bits                         |
+   +----------------+---------------------------------------+
+
 Negative types
 ~~~~~~~~~~~~~~
 
diff --git a/doc/guides/rel_notes/release_21_05.rst b/doc/guides/rel_notes/release_21_05.rst
index e6f99350af..824eb72981 100644
--- a/doc/guides/rel_notes/release_21_05.rst
+++ b/doc/guides/rel_notes/release_21_05.rst
@@ -183,6 +183,10 @@ New Features
     the events across multiple stages.
   * This also reduced the scheduling overhead on a event device.
 
+* **Added conntrack support for rte_flow.**
+
+  * Added conntrack action and item for stateful offloading.
+
 * **Updated testpmd.**
 
   * Added a command line option to configure forced speed for Ethernet port.
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 1fa6e2000e..4c029776aa 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3791,6 +3791,8 @@ This section lists supported pattern items and their attributes, if any.
   - ``s_field {unsigned}``: S field.
   - ``seid {unsigned}``: session endpoint identifier.
 
+- ``conntrack``: match conntrack state.
+
 Actions list
 ^^^^^^^^^^^^
 
@@ -4925,6 +4927,39 @@ NVGRE encapsulation header and sent to port id 0.
  testpmd> flow create 0 ingress transfer pattern eth / end actions
         sample ratio 1 index 0  / port_id id 2 / end
 
+Sample conntrack rules
+~~~~~~~~~~~~~~~~~~~~~~
+
+Conntrack rules can be set by the following commands
+
+Need to construct the connection context with provided information.
+In the first table, create a flow rule by using conntrack action and jump to
+the next table. In the next table, create a rule to check the state.
+
+::
+
+ testpmd> set conntrack com peer 1 is_orig 1 enable 1 live 1 sack 1 cack 0
+        last_dir 0 liberal 0 state 1 max_ack_win 7 r_lim 5 last_win 510
+        last_seq 2632987379 last_ack 2532480967 last_end 2632987379
+        last_index 0x8
+ testpmd> set conntrack orig scale 7 fin 0 acked 1 unack_data 0
+        sent_end 2632987379 reply_end 2633016339 max_win 28960
+        max_ack 2632987379
+ testpmd> set conntrack rply scale 7 fin 0 acked 1 unack_data 0
+        sent_end 2532480967 reply_end 2532546247 max_win 65280
+        max_ack 2532480967
+ testpmd> flow indirect_action 0 create ingress action conntrack / end
+ testpmd> flow create 0 group 3 ingress pattern eth / ipv4 / tcp / end actions indirect 0 / jump group 5 / end
+ testpmd> flow create 0 group 5 ingress pattern eth / ipv4 / tcp / conntrack is 1 / end actions queue index 5 / end
+
+Construct the conntrack again with only "is_orig" set to 0 (other fields are
+ignored), then use "update" interface to update the direction. Create flow
+rules like above for the peer port.
+
+::
+
+ testpmd> flow indirect_action 0 update 0 action conntrack_update dir / end
+
 BPF Functions
 --------------
 
-- 
2.19.0.windows.1