On Thu, Feb 04, 2021 at 07:09:48PM +0200, Andrew Melnychenko wrote:
> From: Andrew <and...@daynix.com>
>
> Added function that loads RSS eBPF program.
> Added stub functions for RSS eBPF loader.
> Added meson and configuration options.
>
> By default, eBPF feature enabled if libbpf is present in the build system.
> libbpf checked in configuration shell script and meson script.
>
> Signed-off-by: Yuri Benditovich <yuri.benditov...@daynix.com>
> Signed-off-by: Andrew Melnychenko <and...@daynix.com>
> ---
> configure | 30 +++
> ebpf/ebpf_rss-stub.c | 40 ++++
> ebpf/ebpf_rss.c | 165 +++++++++++++++++
> ebpf/ebpf_rss.h | 44 +++++
> ebpf/meson.build | 1 +
> ebpf/rss.bpf.skeleton.h | 397 ++++++++++++++++++++++++++++++++++++++++
> ebpf/trace-events | 4 +
> ebpf/trace.h | 2 +
> meson.build | 13 ++
> 9 files changed, 696 insertions(+)
> create mode 100644 ebpf/ebpf_rss-stub.c
> create mode 100644 ebpf/ebpf_rss.c
> create mode 100644 ebpf/ebpf_rss.h
> create mode 100644 ebpf/meson.build
> create mode 100644 ebpf/rss.bpf.skeleton.h
> create mode 100644 ebpf/trace-events
> create mode 100644 ebpf/trace.h
When adding a new build dependancy we need to update the dockerfiles
in tests/docker/dockerfiles to add the required development package
on all the distros that have it available currently. It is in Fedora
at least, but have not checked other distros.
>
> diff --git a/configure b/configure
> index e85d6baf8f..38797e0116 100755
> --- a/configure
> +++ b/configure
> +##########################################
> +# check for usable bpf system call
> +if test "$bpf" = ""; then
> + have_bpf=no
> + if test "$linux" = "yes" -a "$bigendian" != "yes"; then
> + cat > $TMPC << EOF
> + #include <stdlib.h>
> + #include <bpf/libbpf.h>
> + int main(void) {
> + struct bpf_object *obj = NULL;
> + bpf_object__load(obj);
> + exit(0);
> + }
> +EOF
> + if compile_prog "" "-lbpf" ; then
> + have_bpf=yes
> + bpf=yes
> + fi
> + fi
> +fi
libbpf provides a pkg-config file, so it should be probed using
pkg-config in meson.build. CC'ing Paolo to confirm.
> diff --git a/meson.build b/meson.build
> index 2d8b433ff0..9a24020bc3 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -995,6 +995,13 @@ if not get_option('fuse_lseek').disabled()
> endif
> endif
>
> +# libbpf
> +libbpf = not_found
> +if 'CONFIG_EBPF' in config_host
> + libbpf = cc.find_library('bpf', required: true)
> +
> +endif
This is where you need todo the pkg-config search using 'dependency()'
instead of 'find_library'.
> +
> if get_option('cfi')
> cfi_flags=[]
> # Check for dependency on LTO
> @@ -1748,6 +1755,7 @@ if have_system
> 'backends',
> 'backends/tpm',
> 'chardev',
> + 'ebpf',
> 'hw/9pfs',
> 'hw/acpi',
> 'hw/adc',
> @@ -1914,6 +1922,9 @@ subdir('accel')
> subdir('plugins')
> subdir('bsd-user')
> subdir('linux-user')
> +subdir('ebpf')
> +
> +common_ss.add(libbpf)
>
> bsd_user_ss.add(files('gdbstub.c'))
> specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss)
> @@ -2592,6 +2603,7 @@ summary_info += {'RDMA support':
> config_host.has_key('CONFIG_RDMA')}
> summary_info += {'PVRDMA support': config_host.has_key('CONFIG_PVRDMA')}
> summary_info += {'fdt support': fdt_opt == 'disabled' ? false :
> fdt_opt}
> summary_info += {'libcap-ng support': libcap_ng.found()}
> +summary_info += {'bpf support': config_host.has_key('CONFIG_EBPF')}
> # TODO: add back protocol and server version
> summary_info += {'spice support': config_host.has_key('CONFIG_SPICE')}
> summary_info += {'rbd support': rbd.found()}
> @@ -2653,3 +2665,4 @@ if not supported_oses.contains(targetos)
> message('if you care about QEMU on this platform you should contact')
> message('us upstream at qemu-devel@nongnu.org.')
> endif
> +
> --
> 2.30.0
>
Regards,
Daniel
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