selftests: mlxsw: Test port shaper

TBF can be used as a root qdisc, in which case it is supposed to configure
port shaper. Add a test that verifies that this is so by installing a root
TBF with a ETS or PRIO below it, and then expecting individual bands to all
be shaped according to the root TBF configuration.

Signed-off-by: Petr Machata <[e-mail]>
Signed-off-by: Ido Schimmel <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/forwarding/sch_tbf_etsprio.sh

···
 ALL_TESTS="
 	ping_ipv4
 	tbf_test
+	tbf_root_test
 "
 source $lib_dir/sch_tbf_core.sh
+
+QDISC_TYPE=${QDISC% *}
 
 tbf_test_one()
 {
···
 
 tbf_test()
 {
+	log_info "Testing root-$QDISC_TYPE-tbf"
+
 	# This test is used for both ETS and PRIO. Even though we only need two
 	# bands, PRIO demands a minimum of three.
 	tc qdisc add dev $swp2 root handle 10: $QDISC 3 priomap 2 1 0
 	tbf_test_one 128K
+	tc qdisc del dev $swp2 root
+}
+
+tbf_root_test()
+{
+	local bs=128K
+
+	log_info "Testing root-tbf-$QDISC_TYPE"
+
+	tc qdisc replace dev $swp2 root handle 1: \
+		tbf rate 400Mbit burst $bs limit 1M
+	tc qdisc replace dev $swp2 parent 1:1 handle 10: \
+		$QDISC 3 priomap 2 1 0
+	tc qdisc replace dev $swp2 parent 10:3 handle 103: \
+		bfifo limit 1M
+	tc qdisc replace dev $swp2 parent 10:2 handle 102: \
+		bfifo limit 1M
+	tc qdisc replace dev $swp2 parent 10:1 handle 101: \
+		bfifo limit 1M
+
+	do_tbf_test 10 400 $bs
+	do_tbf_test 11 400 $bs
+
 	tc qdisc del dev $swp2 root
 }