selftests: netfilter: add cpu counter check

run task on first CPU with netfilter counters reset and check
cpu meta after another ping
Signed-off-by: NFabian Frederick <fabf@skynet.be>
Acked-by: NFlorian Westphal <fw@strlen.de>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

tools/testing/selftests/netfilter/nft_meta.sh

@@ -33,6 +33,7 @@ table inet filter {
 	counter infproto4count {}
 	counter il4protocounter {}
 	counter imarkcounter {}
+	counter icpu0counter {}
 
 	counter oifcount {}
 	counter oifnamecount {}
@@ -54,6 +55,7 @@ table inet filter {
 		meta nfproto ipv4 counter name "infproto4count"
 		meta l4proto icmp counter name "il4protocounter"
 		meta mark 42 counter name "imarkcounter"
+		meta cpu 0 counter name "icpu0counter"
 	}
 
 	chain output {
@@ -119,6 +121,18 @@ check_one_counter omarkcounter "1" true
 
 if [ $ret -eq 0 ];then
 	echo "OK: nftables meta iif/oif counters at expected values"
+else
+	exit $ret
+fi
+
+#First CPU execution and counter
+taskset -p 01 $$ > /dev/null
+ip netns exec "$ns0" nft reset counters > /dev/null
+ip netns exec "$ns0" ping -q -c 1 127.0.0.1 > /dev/null
+check_one_counter icpu0counter "2" true
+
+if [ $ret -eq 0 ];then
+	echo "OK: nftables meta cpu counter at expected values"
 fi
 
 exit $ret