[PATCH v6 9/9] doc: add bpf library related info

[Konstantin Ananyev <konstantin.ananyev@intel.com>]

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 MAINTAINERS                                 |  1 +
 doc/api/doxy-api-index.md                   |  3 +-
 doc/api/doxy-api.conf                       |  1 +
 doc/guides/prog_guide/bpf_lib.rst           | 38 ++++++++++++++++++++
 doc/guides/prog_guide/index.rst             |  1 +
 doc/guides/rel_notes/release_18_05.rst      |  7 ++++
 doc/guides/testpmd_app_ug/testpmd_funcs.rst | 56 +++++++++++++++++++++++++++++
 7 files changed, 106 insertions(+), 1 deletion(-)
 create mode 100644 doc/guides/prog_guide/bpf_lib.rst

diff --git a/MAINTAINERS b/MAINTAINERS
index 7350f61ed..3d4b92cc4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1063,6 +1063,7 @@ F: lib/librte_latencystats/
 BPF
 M: Konstantin Ananyev <konstantin.ananyev@intel.com>
 F: lib/librte_bpf/
+F: doc/guides/prog_guide/bpf_lib.rst
 
 Test Applications
 -----------------
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index 55d075c66..6365917d5 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -111,7 +111,8 @@ The public API headers are grouped by topics:
   [EFD]                (@ref rte_efd.h),
   [ACL]                (@ref rte_acl.h),
   [member]             (@ref rte_member.h),
-  [flow classify]      (@ref rte_flow_classify.h)
+  [flow classify]      (@ref rte_flow_classify.h),
+  [BPF]                (@ref rte_bpf.h)
 
 - **containers**:
   [mbuf]               (@ref rte_mbuf.h),
diff --git a/doc/api/doxy-api.conf b/doc/api/doxy-api.conf
index aa66751a0..8bc9b0b1d 100644
--- a/doc/api/doxy-api.conf
+++ b/doc/api/doxy-api.conf
@@ -45,6 +45,7 @@ INPUT                   = doc/api/doxy-api-index.md \
                           lib/librte_acl \
                           lib/librte_bbdev \
                           lib/librte_bitratestats \
+                          lib/librte_bpf \
                           lib/librte_cfgfile \
                           lib/librte_cmdline \
                           lib/librte_compat \
diff --git a/doc/guides/prog_guide/bpf_lib.rst b/doc/guides/prog_guide/bpf_lib.rst
new file mode 100644
index 000000000..7c08e6b2d
--- /dev/null
+++ b/doc/guides/prog_guide/bpf_lib.rst
@@ -0,0 +1,38 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2018 Intel Corporation.
+
+Berkeley Packet Filter Library
+==============================
+
+The DPDK provides an BPF library that gives the ability
+to load and execute Enhanced Berkeley Packet Filter (eBPF) bytecode within
+user-space dpdk application.
+
+It supports basic set of features from eBPF spec.
+Please refer to the
+`eBPF spec <https://www.kernel.org/doc/Documentation/networking/filter.txt>`
+for more information.
+Also it introduces basic framework to load/unload BPF-based filters
+on eth devices (right now only via SW RX/TX callbacks).
+
+The library API provides the following basic operations:
+
+*  Create a new BPF execution context and load user provided eBPF code into it.
+
+*   Destroy an BPF execution context and its runtime structures and free the associated memory.
+
+*   Execute eBPF bytecode associated with provided input parameter.
+
+*   Provide information about natively compiled code for given BPF context.
+
+*   Load BPF program from the ELF file and install callback to execute it on given ethdev port/queue.
+
+Not currently supported eBPF features
+-------------------------------------
+
+ - JIT for non X86_64 platforms
+ - cBPF
+ - tail-pointer call
+ - eBPF MAP
+ - skb
+ - external function calls for 32-bit platforms
diff --git a/doc/guides/prog_guide/index.rst b/doc/guides/prog_guide/index.rst
index 235ad0201..2c40fb4ec 100644
--- a/doc/guides/prog_guide/index.rst
+++ b/doc/guides/prog_guide/index.rst
@@ -51,6 +51,7 @@ Programmer's Guide
     vhost_lib
     metrics_lib
     port_hotplug_framework
+    bpf_lib
     source_org
     dev_kit_build_system
     dev_kit_root_make_help
diff --git a/doc/guides/rel_notes/release_18_05.rst b/doc/guides/rel_notes/release_18_05.rst
index 5d1cc1807..41a862959 100644
--- a/doc/guides/rel_notes/release_18_05.rst
+++ b/doc/guides/rel_notes/release_18_05.rst
@@ -183,6 +183,13 @@ New Features
   stats/xstats on shared memory from secondary process, and also pdump packets on
   those virtual devices.
 
+* **Added the BPF Library.**
+
+  The BPF Library provides the ability to load and execute
+  Enhanced Berkeley Packet Filter (eBPF) within user-space dpdk application.
+  Also it introduces basic framework to load/unload BPF-based filters
+  on eth devices (right now only via SW RX/TX callbacks).
+  It also adds dependency on libelf.
 
 API Changes
 -----------
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 013a40549..e4afb03dc 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -3813,3 +3813,59 @@ Validate and create a QinQ rule on port 0 to steer traffic to a queue on the hos
    ID      Group   Prio    Attr    Rule
    0       0       0       i-      ETH VLAN VLAN=>VF QUEUE
    1       0       0       i-      ETH VLAN VLAN=>PF QUEUE
+
+BPF Functions
+--------------
+
+The following sections show functions to load/unload eBPF based filters.
+
+bpf-load
+~~~~~~~~
+
+Load an eBPF program as a callback for partciular RX/TX queue::
+
+   testpmd> bpf-load rx|tx (portid) (queueid) (load-flags) (bpf-prog-filename)
+
+The available load-flags are:
+
+* ``J``: use JIT generated native code, otherwise BPF interpreter will be used.
+
+* ``M``: assume input parameter is a pointer to rte_mbuf, otherwise assume it is a pointer to first segment's data.
+
+* ``-``: none.
+
+.. note::
+
+   You'll need clang v3.7 or above to build bpf program you'd like to load
+
+For example:
+
+.. code-block:: console
+
+   cd test/bpf
+   clang -O2 -target bpf -c t1.c
+
+Then to load (and JIT compile) t1.o at RX queue 0, port 1::
+
+.. code-block:: console
+
+   testpmd> bpf-load rx 1 0 J ./dpdk.org/test/bpf/t1.o
+
+To load (not JITed) t1.o at TX queue 0, port 0::
+
+.. code-block:: console
+
+   testpmd> bpf-load tx 0 0 - ./dpdk.org/test/bpf/t1.o
+
+bpf-unload
+~~~~~~~~~~
+
+Unload previously loaded eBPF program for partciular RX/TX queue::
+
+   testpmd> bpf-unload rx|tx (portid) (queueid)
+
+For example to unload BPF filter from TX queue 0, port 0:
+
+.. code-block:: console
+
+   testpmd> bpf-load tx 0 0 - ./dpdk.org/test/bpf/t1.o
-- 
2.13.6