net: sched: make cls_u32 lockless
Make cls_u32 classifier safe to run without holding lock. This patch
converts statistics that are kept in read section u32_classify into
per cpu counters.
This patch was tested with a tight u32 filter add/delete loop while
generating traffic with pktgen. By running pktgen on vlan devices
created on top of a physical device we can hit the qdisc layer
correctly. For ingress qdisc's a loopback cable was used.
for i in {1..100}; do
q=`echo $i%8|bc`;
echo -n "u32 tos: iteration $i on queue $q";
tc filter add dev p3p2 parent $p prio $i u32 match ip tos 0x10 0xff \
action skbedit queue_mapping $q;
sleep 1;
tc filter del dev p3p2 prio $i;
echo -n "u32 tos hash table: iteration $i on queue $q";
tc filter add dev p3p2 parent $p protocol ip prio $i handle 628: u32 divisor 1
tc filter add dev p3p2 parent $p protocol ip prio $i u32 \
match ip protocol 17 0xff link 628: offset at 0 mask 0xf00 shift 6 plus 0
tc filter add dev p3p2 parent $p protocol ip prio $i u32 \
ht 628:0 match ip tos 0x10 0xff action skbedit queue_mapping $q
sleep 2;
tc filter del dev p3p2 prio $i
sleep 1;
done
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed