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name : sch_tbf_core.sh
 # SPDX-License-Identifier: GPL-2.0

# This test sends a stream of traffic from H1 through a switch, to H2. On the
# egress port from the switch ($swp2), a shaper is installed. The test verifies
# that the rates on the port match the configured shaper.
#
# In order to test per-class shaping, $swp2 actually contains TBF under PRIO or
# ETS, with two different configurations. Traffic is prioritized using 802.1p.
#
# +-------------------------------------------+
# | H1                                        |
# |     + $h1.10                  $h1.11 +    |
# |     | 192.0.2.1/28     192.0.2.17/28 |    |
# |     |                                |    |
# |     \______________    _____________/     |
# |                    \ /                    |
# |                     + $h1                 |
# +---------------------|---------------------+
#                       |
# +---------------------|---------------------+
# | SW                  + $swp1               |
# |     _______________/ \_______________     |
# |    /                                 \    |
# |  +-|--------------+   +--------------|-+  |
# |  | + $swp1.10     |   |     $swp1.11 + |  |
# |  |                |   |                |  |
# |  |     BR10       |   |       BR11     |  |
# |  |                |   |                |  |
# |  | + $swp2.10     |   |     $swp2.11 + |  |
# |  +-|--------------+   +--------------|-+  |
# |    \_______________   ______________/     |
# |                    \ /                    |
# |                     + $swp2               |
# +---------------------|---------------------+
#                       |
# +---------------------|---------------------+
# | H2                  + $h2                 |
# |      ______________/ \______________      |
# |     /                               \     |
# |     |                               |     |
# |     + $h2.10                 $h2.11 +     |
# |       192.0.2.2/28    192.0.2.18/28       |
# +-------------------------------------------+

NUM_NETIFS=4
CHECK_TC="yes"
source $lib_dir/lib.sh

ipaddr()
{
	local host=$1; shift
	local vlan=$1; shift

	echo 192.0.2.$((16 * (vlan - 10) + host))
}

host_create()
{
	local dev=$1; shift
	local host=$1; shift

	simple_if_init $dev
	mtu_set $dev 10000

	vlan_create $dev 10 v$dev $(ipaddr $host 10)/28
	ip link set dev $dev.10 type vlan egress 0:0

	vlan_create $dev 11 v$dev $(ipaddr $host 11)/28
	ip link set dev $dev.11 type vlan egress 0:1
}

host_destroy()
{
	local dev=$1; shift

	vlan_destroy $dev 11
	vlan_destroy $dev 10
	mtu_restore $dev
	simple_if_fini $dev
}

h1_create()
{
	host_create $h1 1
}

h1_destroy()
{
	host_destroy $h1
}

h2_create()
{
	host_create $h2 2

	tc qdisc add dev $h2 clsact
	tc filter add dev $h2 ingress pref 1010 prot 802.1q \
	   flower $TCFLAGS vlan_id 10 action pass
	tc filter add dev $h2 ingress pref 1011 prot 802.1q \
	   flower $TCFLAGS vlan_id 11 action pass
}

h2_destroy()
{
	tc qdisc del dev $h2 clsact
	host_destroy $h2
}

switch_create()
{
	local intf
	local vlan

	ip link add dev br10 type bridge
	ip link add dev br11 type bridge

	for intf in $swp1 $swp2; do
		ip link set dev $intf up
		mtu_set $intf 10000

		for vlan in 10 11; do
			vlan_create $intf $vlan
			ip link set dev $intf.$vlan master br$vlan
			ip link set dev $intf.$vlan up
		done
	done

	for vlan in 10 11; do
		ip link set dev $swp1.$vlan type vlan ingress 0:0 1:1
	done

	ip link set dev br10 up
	ip link set dev br11 up
}

switch_destroy()
{
	local intf
	local vlan

	# A test may have been interrupted mid-run, with Qdisc installed. Delete
	# it here.
	tc qdisc del dev $swp2 root 2>/dev/null

	ip link set dev br11 down
	ip link set dev br10 down

	for intf in $swp2 $swp1; do
		for vlan in 11 10; do
			ip link set dev $intf.$vlan down
			ip link set dev $intf.$vlan nomaster
			vlan_destroy $intf $vlan
		done

		mtu_restore $intf
		ip link set dev $intf down
	done

	ip link del dev br11
	ip link del dev br10
}

setup_prepare()
{
	h1=${NETIFS[p1]}
	swp1=${NETIFS[p2]}

	swp2=${NETIFS[p3]}
	h2=${NETIFS[p4]}

	swp3=${NETIFS[p5]}
	h3=${NETIFS[p6]}

	swp4=${NETIFS[p7]}
	swp5=${NETIFS[p8]}

	h2_mac=$(mac_get $h2)

	vrf_prepare

	h1_create
	h2_create
	switch_create
}

cleanup()
{
	pre_cleanup

	switch_destroy
	h2_destroy
	h1_destroy

	vrf_cleanup
}

ping_ipv4()
{
	ping_test $h1.10 $(ipaddr 2 10) " vlan 10"
	ping_test $h1.11 $(ipaddr 2 11) " vlan 11"
}

tbf_get_counter()
{
	local vlan=$1; shift

	tc_rule_stats_get $h2 10$vlan ingress .bytes
}

do_tbf_test()
{
	local vlan=$1; shift
	local mbit=$1; shift

	start_traffic $h1.$vlan $(ipaddr 1 $vlan) $(ipaddr 2 $vlan) $h2_mac
	sleep 5 # Wait for the burst to dwindle

	local t2=$(busywait_for_counter 1000 +1 tbf_get_counter $vlan)
	sleep 10
	local t3=$(tbf_get_counter $vlan)
	stop_traffic

	RET=0

	# Note: TBF uses 10^6 Mbits, not 2^20 ones.
	local er=$((mbit * 1000 * 1000))
	local nr=$(rate $t2 $t3 10)
	local nr_pct=$((100 * (nr - er) / er))
	((-5 <= nr_pct && nr_pct <= 5))
	check_err $? "Expected rate $(humanize $er), got $(humanize $nr), which is $nr_pct% off. Required accuracy is +-5%."

	log_test "TC $((vlan - 10)): TBF rate ${mbit}Mbit"
}
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