package/bcc: new package

bcc is a front-end tool for eBPF:
https://github.com/iovisor/bcc/blob/master/README.md
eBPF is the most powerful Linux tracer, and bcc allows writing eBPF
scripts in C and PYTHON3.

bcc can help to troubleshoot issues quickly on embedded systems (as long
as Linux kernel version >= 4.1).

bcc can also make it easy to create observabilty tools, SDN
configuration, ddos mitigation, intrusion detection and secure
containers. More information is available at: https://ebpf.io/

BCC can be tested on the target :
$ mount -t debugfs none /sys/kernel/debug
$ cd /usr/share/bcc/tools
$ ./execsnoop

Signed-off-by: Jugurtha BELKALEM <jugurtha.belkalem@smile.fr>
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Tested-by: Qais Yousef <qais.yousef@arm.com>
Reviewed-by: Qais Yousef <qais.yousef@arm.com>
Cc: Qais Yousef <qyousef@layalina.io>
Signed-off-by: Mat Martineau <martineau@kernel.org>
[Arnout: order dependencies alphabetically, fix Config.in comment]
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

DEVELOPERS

@@ -1682,6 +1682,7 @@ N:	Joshua Henderson <joshua.henderson@microchip.com>
 F:	package/qt5/qt5wayland/
 
 N:	Jugurtha BELKALEM <jugurtha.belkalem@smile.fr>
+F:	package/bcc/
 F:	package/python-aiofiles/
 F:	package/python-crayons/
 F:	package/python-cycler/
@@ -2683,6 +2684,7 @@ F:	configs/qemu_*
 F:	configs/am574x_idk_defconfig
 F:	package/alure/
 F:	package/aubio/
+F:	package/bcc/
 F:	package/binutils/
 F:	package/bullet/
 F:	package/clinfo/

package/Config.in

@@ -87,6 +87,7 @@ endmenu
 
 menu "Debugging, profiling and benchmark"
 	source "package/babeltrace2/Config.in"
+	source "package/bcc/Config.in"
 	source "package/blktrace/Config.in"
 	source "package/bonnie/Config.in"
 	source "package/bpftool/Config.in"

package/bcc/Config.in

@@ -0,0 +1,45 @@
+config BR2_PACKAGE_BCC
+	bool "bcc"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_USE_MMU # python3
+	depends on BR2_TOOLCHAIN_USES_GLIBC # hardcode GNU tuple (x86_64-unknown-linux-gnu)
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # clang
+	depends on BR2_INSTALL_LIBSTDCPP # clang
+	depends on BR2_HOST_GCC_AT_LEAST_7 # clang
+	depends on BR2_USE_WCHAR # clang, python3
+	depends on BR2_TOOLCHAIN_HAS_THREADS # clang, python3
+	depends on !BR2_STATIC_LIBS # clang, python3
+	select BR2_PACKAGE_CLANG
+	select BR2_PACKAGE_ELFUTILS
+	select BR2_PACKAGE_FLEX # needs FlexLexer.h
+	select BR2_PACKAGE_HOST_ZIP
+	select BR2_PACKAGE_LLVM
+	select BR2_PACKAGE_LLVM_BPF
+	select BR2_PACKAGE_PYTHON3
+	help
+	  BPF Compiler Collection (BCC)
+
+	  BCC is a toolkit for creating efficient kernel tracing and
+	  manipulation programs, and includes several useful tools and
+	  examples. It makes use of extended BPF (Berkeley Packet
+	  Filters), formally known as eBPF, a new feature that was
+	  first added to Linux 3.15. Much of what BCC uses requires
+	  Linux 4.1 and above.
+
+	  Note: Before using bcc, you need either need to :
+	  - For kernel_ver = [4.1, 5.2) : Copy kernel source code
+	  to target folder /lib/module/<kernel_ver>/build.
+	  - Or kernel_ver >= 5.2 : Compile kernel with CONFIG_IKHEADERS
+	  and use generated headers under /sys/kernel/kheaders.tar.xz
+	  to populate /lib/module/<kernel_ver>/build.
+
+	  That's because the clang frontend build eBPF code at runtime.
+
+	  https://github.com/iovisor/bcc
+	  http://www.ebpf.io
+
+comment "bcc needs a glibc toolchain, C++, gcc >= 7, host gcc >= 7"
+	depends on BR2_PACKAGE_LLVM_ARCH_SUPPORTS
+	depends on BR2_USE_MMU
+	depends on !BR2_TOOLCHAIN_USES_GLIBC || !BR2_INSTALL_LIBSTDCPP \
+		|| !BR2_TOOLCHAIN_GCC_AT_LEAST_7 || !BR2_HOST_GCC_AT_LEAST_7

package/bcc/bcc.hash

@@ -0,0 +1,3 @@
+# locally calculated
+sha256  321575fa94f3274040379dd2d4535217f45099f4240b58a4dfc171aa8c78402f  bcc-src-with-submodule.tar.gz
+sha256  b40930bbcf80744c86c46a12bc9da056641d722716c378f5659b9e555ef833e1  LICENSE.txt

package/bcc/bcc.mk

@@ -0,0 +1,52 @@
+################################################################################
+#
+# bcc
+#
+################################################################################
+
+BCC_VERSION = 0.29.1
+BCC_SITE = https://github.com/iovisor/bcc/releases/download/v$(BCC_VERSION)
+BCC_SOURCE = bcc-src-with-submodule.tar.gz
+BCC_LICENSE = Apache-2.0
+BCC_LICENSE_FILES = LICENSE.txt
+BCC_INSTALL_STAGING = YES
+BCC_DEPENDENCIES = \
+	clang \
+	elfutils \
+	flex \
+	host-bison \
+	host-flex \
+	host-python-setuptools \
+	host-zip \
+	llvm \
+	python3
+
+# ENABLE_LLVM_SHARED=ON to use llvm.so - we only support shared libs
+# Force REVISION otherwise bcc will use git describe to generate a version number.
+BCC_CONF_OPTS = \
+	-DENABLE_LLVM_SHARED:BOOL=ON \
+	-DREVISION:STRING=$(BCC_VERSION) \
+	-DENABLE_CLANG_JIT:BOOL=ON \
+	-DENABLE_MAN:BOOL=OFF \
+	-DENABLE_EXAMPLES:BOOL=OFF \
+	-DPY_SKIP_DEB_LAYOUT:BOOL=ON
+
+define BCC_LINUX_CONFIG_FIXUPS
+	# Enable kernel support for eBPF
+	$(call KCONFIG_ENABLE_OPT,CONFIG_BPF)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_BPF_SYSCALL)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_NET_CLS_BPF)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_NET_ACT_BPF)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_BPF_JIT)
+	# [for Linux kernel versions 4.1 through 4.6]
+	$(call KCONFIG_ENABLE_OPT,CONFIG_HAVE_BPF_JIT)
+	# [for Linux kernel versions 4.7 and later]
+	$(call KCONFIG_ENABLE_OPT,CONFIG_HAVE_EBPF_JIT)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_BPF_EVENTS)
+	# [for Linux kernel versions 5.2 and later]
+	$(call KCONFIG_ENABLE_OPT,CONFIG_IKHEADERS)
+	# bcc needs debugfs at runtime
+	$(call KCONFIG_ENABLE_OPT,CONFIG_DEBUG_FS)
+endef
+
+$(eval $(cmake-package))