ebpf: Added eBPF RSS loader.

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.benditovich@daynix.com>
Signed-off-by: Andrew Melnychenko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index 632b380738..bcbce8e164 100644
--- a/meson.build
+++ b/meson.build
@@ -1032,6 +1032,23 @@ if not get_option('fuse_lseek').disabled()
   endif
 endif
 
+# libbpf
+libbpf = dependency('libbpf', required: get_option('bpf'), method: 'pkg-config')
+if libbpf.found() and not cc.links('''
+   #include <bpf/libbpf.h>
+   int main(void)
+   {
+     bpf_object__destroy_skeleton(NULL);
+     return 0;
+   }''', dependencies: libbpf)
+  libbpf = not_found
+  if get_option('bpf').enabled()
+    error('libbpf skeleton test failed')
+  else
+    warning('libbpf skeleton test failed, disabling')
+  endif
+endif
+
 if get_option('cfi')
   cfi_flags=[]
   # Check for dependency on LTO
@@ -1131,6 +1148,7 @@ endif
 config_host_data.set('CONFIG_GTK', gtk.found())
 config_host_data.set('CONFIG_LIBATTR', have_old_libattr)
 config_host_data.set('CONFIG_LIBCAP_NG', libcap_ng.found())
+config_host_data.set('CONFIG_EBPF', libbpf.found())
 config_host_data.set('CONFIG_LIBISCSI', libiscsi.found())
 config_host_data.set('CONFIG_LIBNFS', libnfs.found())
 config_host_data.set('CONFIG_RBD', rbd.found())
@@ -1800,6 +1818,7 @@ if have_system
     'backends',
     'backends/tpm',
     'chardev',
+    'ebpf',
     'hw/9pfs',
     'hw/acpi',
     'hw/adc',
@@ -1992,6 +2011,9 @@ 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)
@@ -2701,6 +2723,7 @@ 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': libbpf.found()}
 # TODO: add back protocol and server version
 summary_info += {'spice support':     config_host.has_key('CONFIG_SPICE')}
 summary_info += {'rbd support':       rbd.found()}