build: drop "ebpf" configuration for n-acd compilation

Since we now check whether the user's machine supports
eBPF at runtime, we can drop all of this build machinery.

.gitlab-ci/run-test.sh

@@ -155,12 +155,7 @@ test_subtree() {
     do_clean
     pushd ./src/$d
 
-    ARGS=()
+    CC="$cc" CFLAGS="-Werror -Wall" meson build
-    if [ "$d" = n-acd ]; then
-        ARGS+=('-Debpf=false')
-    fi
-
-    CC="$cc" CFLAGS="-Werror -Wall" meson build "${ARGS[@]}"
     ninja -v -C build test
 
     popd

contrib/fedora/rpm/NetworkManager.spec

@@ -154,17 +154,6 @@
 %bcond_with ifcfg_migrate
 %endif
 
-%if 0%{?fedora}
-# Although eBPF would be available on Fedora's kernel, it seems
-# we often get SELinux denials (rh#1651654). But even aside them,
-# bpf(BPF_MAP_CREATE, ...) randomly fails with EPERM. That might
-# be related to `ulimit -l`. Anyway, this is not usable at the
-# moment.
-%global ebpf_enabled "no"
-%else
-%global ebpf_enabled "no"
-%endif
-
 # Fedora 33 enables LTO by default by setting CFLAGS="-flto -ffat-lto-objects".
 # However, we also require "-flto -flto-partition=none", so disable Fedora's
 # default and use our configure option --with-lto instead.
@@ -682,11 +671,6 @@ Preferably use nmcli instead.
 	-Dlibpsl=true \
 %else
 	-Dlibpsl=false \
-%endif
-%if %{ebpf_enabled} != "yes"
-	-Debpf=false \
-%else
-	-Debpf=true \
 %endif
 	-Dsession_tracking=systemd \
 	-Dsuspend_resume=systemd \

contrib/fedora/rpm/configure-for-system.sh

@@ -155,7 +155,6 @@ P_CRYPTO="${CRYPTO-}"
 P_DBUS_SYS_DIR="${DBUS_SYS_DIR-}"
 P_DHCP_DEFAULT="${DHCP_DEFAULT-}"
 P_DNS_RC_MANAGER_DEFAULT="${DNS_RC_MANAGER_DEFAULT-}"
-P_EBPF_ENABLED="${EBPF_ENABLED-no}"
 P_FIREWALLD_ZONE="${FIREWALLD_ZONE-}"
 P_IWD="${IWD-}"
 P_LOGGING_BACKEND_DEFAULT="${LOGGING_BACKEND_DEFAULT-}"
@@ -396,7 +395,6 @@ meson setup\
     -Dmodify_system=true \
     -Dconcheck=true \
     -Dlibpsl="$(bool_true "$P_FEDORA")" \
-    -Debpf="$(bool_true "$P_EBPF_ENABLED")" \
     -Dsession_tracking=systemd \
     -Dsuspend_resume=systemd \
     -Dsystemdsystemunitdir=/usr/lib/systemd/system \

contrib/scripts/nm-ci-run.sh

@@ -180,8 +180,6 @@ meson setup build \
     -D crypto=$_WITH_CRYPTO \
     -D docs=$_WITH_DOCS \
     \
-    -D ebpf=false \
-    \
     -D iwd=true \
     -D ofono=true \
     -D teamdctl=$_WITH_LIBTEAM \

meson.build

@@ -477,19 +477,6 @@ if enable_selinux
 endif
 config_h.set10('HAVE_SELINUX', enable_selinux)
 
-# eBPF support
-ebpf_opt = get_option('ebpf')
-# 'auto' means 'false', because there are still issues.
-if ebpf_opt != 'true'
-  enable_ebpf = false
-else
-  enable_ebpf = true
-  if not cc.has_header('linux/bpf.h')
-    assert(ebpf_opt != 'true', 'eBPF requires kernel support')
-    enable_ebpf = false
-  endif
-endif
-
 # libaudit support
 libaudit = get_option('libaudit')
 enable_libaudit = libaudit.contains('yes')
@@ -1160,6 +1147,5 @@ output +=      'have-nss: ' + crypto_nss_dep.found().to_string() + ')\n'
 output += '  sanitizers: ' + get_option('b_sanitize') + '\n'
 output += '  Mozilla Public Suffix List: ' + enable_libpsl.to_string() + '\n'
 output += '  vapi: ' + enable_vapi.to_string() + '\n'
-output += '  ebpf: ' + enable_ebpf.to_string() + '\n'
 output += '  readline: ' + with_readline + '\n'
 message(output)

meson_options.txt

@@ -44,7 +44,7 @@ option('nmcli', type: 'boolean', value: true, description: 'Build nmcli')
 option('nmtui', type: 'boolean', value: true, description: 'Build nmtui')
 option('nm_cloud_setup', type: 'boolean', value: true, description: 'Build nm-cloud-setup, a tool for automatically configuring networking in cloud')
 option('bluez5_dun', type: 'boolean', value: false, description: 'enable Bluez5 DUN support')
-option('ebpf', type: 'combo', choices: ['auto', 'true', 'false'], description: 'Enable eBPF support')
+option('ebpf', type: 'combo', choices: ['auto', 'true', 'false'], description: 'Enable eBPF support (deprecated)')
 option('nbft', type: 'boolean', value: true, description: 'Enable NBFT support in the initrd generator')
 
 # configuration plugins

src/meson.build

@@ -24,7 +24,7 @@ libn_acd = static_library(
     'n-acd/src/n-acd.c',
     'n-acd/src/n-acd-probe.c',
     'n-acd/src/util/timer.c',
-    enable_ebpf ? 'n-acd/src/n-acd-bpf.c' : 'n-acd/src/n-acd-bpf-fallback.c',
+    'n-acd/src/n-acd-bpf.c',
   ),
   include_directories: include_directories(
     'c-list/src',