[Buildroot] [PATCH v4 3/4] package/libbpf: new package

[Qais Yousef]

Hi Romain

Shiny new package! Should we add a couple of sentences about the package in the
commit message rather than leaving it empty?

I haven't tested it yet, but a courtesy look at the patch it looked fine to me
in general. I haven't played much with libbpf to test this. Is it supposed to
completely replace BCC to compile and load bpf code, or just used to compile
BPF code?

Thanks

--
Qais Yousef

On 11/07/20 01:28, Romain Naour wrote:
> Signed-off-by: Jugurtha BELKALEM <jugurtha.belkalem at smile.fr>
> Signed-off-by: Romain Naour <romain.naour at gmail.com>
> Cc: Qais Yousef <qais.yousef at arm.com>
> ---
>  package/Config.in        |  1 +
>  package/libbpf/Config.in | 20 ++++++++++++++++++++
>  package/libbpf/libbpf.mk | 40 ++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 61 insertions(+)
>  create mode 100644 package/libbpf/Config.in
>  create mode 100644 package/libbpf/libbpf.mk
> 
> diff --git a/package/Config.in b/package/Config.in
> index 27d201cfd2..c0b8b06846 100644
> --- a/package/Config.in
> +++ b/package/Config.in
> @@ -107,6 +107,7 @@ menu "Debugging, profiling and benchmark"
>  	source "package/kvm-unit-tests/Config.in"
>  	source "package/kyua/Config.in"
>  	source "package/latencytop/Config.in"
> +	source "package/libbpf/Config.in"
>  	source "package/lmbench/Config.in"
>  	source "package/lsof/Config.in"
>  	source "package/ltp-testsuite/Config.in"
> diff --git a/package/libbpf/Config.in b/package/libbpf/Config.in
> new file mode 100644
> index 0000000000..c5b24c5eb5
> --- /dev/null
> +++ b/package/libbpf/Config.in
> @@ -0,0 +1,20 @@
> +config BR2_PACKAGE_LIBBPF
> +	bool "libbpf"
> +	depends on BR2_USE_WCHAR # elfutils
> +	depends on !BR2_STATIC_LIBS # elfutils
> +	depends on BR2_TOOLCHAIN_HAS_THREADS # elfutils
> +	depends on BR2_TOOLCHAIN_USES_UCLIBC || BR2_TOOLCHAIN_USES_GLIBC # elfutils
> +	select BR2_PACKAGE_ELFUTILS
> +	select BR2_PACKAGE_ZLIB
> +	help
> +	  libbpf library.
> +	  A mirror of bpf-next linux tree bpf-next/tools/lib/bpf
> +	  directory plus its supporting header files. The version
> +	  of the package reflects the version of ABI.
> +
> +	  https://github.com/libbpf/libbpf
> +
> +comment "libbpf needs a uClibc or glibc toolchain w/ wchar, dynamic library, threads"
> +	depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS \
> +		|| !BR2_TOOLCHAIN_HAS_THREADS \
> +		|| !(BR2_TOOLCHAIN_USES_UCLIBC || BR2_TOOLCHAIN_USES_GLIBC)
> diff --git a/package/libbpf/libbpf.mk b/package/libbpf/libbpf.mk
> new file mode 100644
> index 0000000000..33e303db16
> --- /dev/null
> +++ b/package/libbpf/libbpf.mk
> @@ -0,0 +1,40 @@
> +################################################################################
> +#
> +# libbpf
> +#
> +################################################################################
> +
> +LIBBPF_VERSION = 0.2
> +LIBBPF_SITE = $(call github,libbpf,libbpf,v$(LIBBPF_VERSION))
> +LIBBPF_LICENSE = GPL-2.0, LGPL-2.1, BSD-2-Clause
> +LIBBPF_LICENSE_FILES = LICENSE LICENSE.BSD-2-Clause LICENSE.LPGL-2.1
> +LIBBPF_DEPENDENCIES = host-bison host-flex host-pkgconf elfutils zlib
> +LIBBPF_INSTALL_STAGING = YES
> +
> +define LIBBPF_BUILD_CMDS
> +	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) \
> +		-C $(@D)/src
> +endef
> +
> +# bpf/bpf.h installed by libbpf use enm bpf_iter_link_info that was added since
> +# kernel 5.9, so we need to update some uapi headers in STAGING_DIR if the
> +# toolchain is build with linux-headers < 5.9.
> +# Otherwise bpf/bpf.h is broken due to out of date linux/bpf.h installed by the
> +# toolchain.
> +# https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a5cbe05a6673b85bed2a63ffcfea6a96c6410cff
> +ifeq ($(BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_9),)
> +LIBBPF_UPDATE_UAPI_HEADERS = install_uapi_headers
> +endif
> +
> +define LIBBPF_INSTALL_STAGING_CMDS
> +	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) \
> +		-C $(@D)/src install $(LIBBPF_UPDATE_UAPI_HEADERS) \
> +		DESTDIR=$(STAGING_DIR)
> +endef
> +
> +define LIBBPF_INSTALL_TARGET_CMDS
> +	$(TARGET_MAKE_ENV) $(TARGET_CONFIGURE_OPTS) $(MAKE) \
> +		-C $(@D)/src install DESTDIR=$(TARGET_DIR)
> +endef
> +
> +$(eval $(generic-package))
> -- 
> 2.25.4
>