doc: introduce BCC

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>

kernel/Documentation/bpf/bcc_tool_chain.rst

@@ -0,0 +1,37 @@
+=============================
+BCC (BPF Compiler Collection)
+=============================
+
+BCC is a toolkit to makes eBPF programs easier to write, with
+front-ends in Python and lua.  BCC requires LLVM and clang (in correct
+versions) available on target, because BCC programs does runtime
+compilation of the pseudo-C code into eBPF instructions.
+
+BBC includes several useful tools_ and examples_, developed by
+recognized performance analyst `Brendan Gregg`_ and covered with a
+tutorial_ and slides_.
+
+.. _tools:
+   https://github.com/iovisor/bcc/tree/master/tools
+
+.. _examples:
+   https://github.com/iovisor/bcc/tree/master/examples
+
+.. _`Brendan Gregg`: http://www.brendangregg.com/
+
+.. _tutorial:
+   https://github.com/iovisor/bcc/blob/master/docs/tutorial.md
+
+.. _slides:
+   http://www.slideshare.net/brendangregg/linux-bpf-superpowers/43/
+
+The project maintains an overview of `eBPF supported kernels`_ and
+what versions got which specific features.  There is also a `BCC
+Reference Guide`_.
+
+.. _eBPF supported kernels:
+   https://github.com/iovisor/bcc/blob/master/docs/kernel-versions.md
+
+.. _BCC Reference Guide:
+   https://github.com/iovisor/bcc/blob/master/docs/reference_guide.md
+

kernel/Documentation/bpf/index.rst

@@ -30,7 +30,11 @@ Documentation
 The primary user documentation for extended BPF is in the man-page for
 the `bpf(2)`_ syscall.
 
-This documentation is focused on the kernel trees sample/bpf and tools/lib/
+This documentation is focused on the kernel tree's `samples/bpf/`_ and
+`tools/lib/bpf/`_.  It is worth mentioning that other projects exists
+like :doc:`bcc_tool_chain`, that have a slightly different user-facing
+syntax, but is interfacing with the same kernel facilities as this
+documentation is covering.
 
 .. Comments / Notes:
    Sections:
@@ -42,6 +46,7 @@ This documentation is focused on the kernel trees sample/bpf and tools/lib/
    :maxdepth: 1
 
    ebpf_maps
+   bcc_tool_chain
 
 .. links:
 
@@ -55,3 +60,8 @@ This documentation is focused on the kernel trees sample/bpf and tools/lib/
 .. _presentation by Alexei:
    http://www.slideshare.net/AlexeiStarovoitov/bpf-inkernel-virtual-machine
 
+.. _samples/bpf/:
+   https://github.com/torvalds/linux/blob/master/samples/bpf/
+
+.. _tools/lib/bpf/:
+   https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/tools/lib/bpf/