net/mlxsw/qos_pfc.sh

2 # SPDX-License-Identifier: GPL-2.0
4 # This test injects a 10-MB burst of traffic with VLAN tag and 802.1p priority
8 # - the stream first ingresses through $swp1, where it is forwarded to $swp3
10 # - then it ingresses through $swp4. Here it is put to a lossless buffer and put
15 # - since $swp3 now can't send traffic, the traffic ingressing $swp1 is kept at
19 # - eventually the PFC pool gets some traffic out, headroom therefore gets some
24 # - if PFC works, all lossless flow packets that ingress through $swp1 should
28 # - it should all play out relatively quickly, so that SLL and HLL will not
31 # +-----------------------+
37 # +---|-------------------+  +--------------------+
39 # +---|----------------------|--------------------|---------------------------+
44 # | +-|----------------------|-+                +-|------------------------+  |
50 # | +--------------------------+                +---------|----------------+  |
58 # +-------------------------------------------------------|-------------------+
60 #                                                     +---|-------------------+
65 #                                                     +-----------------------+
126 	# -----
161 	# -----
166 	ip link set dev $swp1.111 type vlan ingress-qos-map 0:0 1:1
175 	dcb buffer set dev $swp1 prio-buffer all:0 1:1
178 	# -----
183 	ip link set dev $swp2.111 type vlan egress-qos-map 0:0 1:1
188 	# prio 0->TC0 (band 7), 1->TC1 (band 6). TC1 is shaped.
195 	# -----
200 	ip link set dev $swp3.111 type vlan egress-qos-map 0:0 1:1
205 	# prio 0->TC0 (band 7), 1->TC1 (band 6)
213 	dcb buffer set dev $swp3 prio-buffer all:0 1:1
214 	dcb pfc set dev $swp3 prio-pfc all:off 1:on
217 	# -----
222 	ip link set dev $swp4.111 type vlan ingress-qos-map 0:0 1:1
227 	# Configure qdisc so that we can hand-tune headroom.
230 	dcb buffer set dev $swp4 prio-buffer all:0 1:1
231 	dcb pfc set dev $swp4 prio-pfc all:off 1:on
233 	# is (-2*MTU) about 80K of delay provision.
241 	# 8-lane ports use two buffers among which the configured buffer
243 	if [[ $lanes_swp4 -eq 8 ]]; then
247 	dcb buffer set dev $swp4 buffer-size all:0 1:$pg1_size
250 	# -------
275 	# -------
288 	# -----
290 	dcb buffer set dev $swp4 buffer-size all:0
291 	dcb pfc set dev $swp4 prio-pfc all:off
292 	dcb buffer set dev $swp4 prio-buffer all:0
303 	# -----
305 	dcb pfc set dev $swp3 prio-pfc all:off
306 	dcb buffer set dev $swp3 prio-buffer all:0
317 	# -----
330 	# -----
332 	dcb buffer set dev $swp1 prio-buffer all:0
386 	local in0=$(ethtool_stats_get $swp1 rx_octets_prio_1)
389 	$MZ $h1 -p 8000 -Q 1:111 -A 192.0.2.33 -B 192.0.2.34 \
390 		-a own -b $h2mac -c $pkts -t udp -q
393 	local in1=$(ethtool_stats_get $swp1 rx_octets_prio_1)
396 	local din=$((in1 - in0))
397 	local dout=$((out1 - out0))
405 	check_err $? "$((din - dout)) bytes out of $din ingressed got lost"