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-rw-r--r--tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh84
1 files changed, 84 insertions, 0 deletions
diff --git a/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh b/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
new file mode 100644
index 000000000..faa51012c
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/mlxsw/qos_lib.sh
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: GPL-2.0
+
+check_rate()
+{
+ local rate=$1; shift
+ local min=$1; shift
+ local what=$1; shift
+
+ if ((rate > min)); then
+ return 0
+ fi
+
+ echo "$what $(humanize $ir) < $(humanize $min)" > /dev/stderr
+ return 1
+}
+
+measure_rate()
+{
+ local sw_in=$1; shift # Where the traffic ingresses the switch
+ local host_in=$1; shift # Where it ingresses another host
+ local counter=$1; shift # Counter to use for measurement
+ local what=$1; shift
+
+ local interval=10
+ local i
+ local ret=0
+
+ # Dips in performance might cause momentary ingress rate to drop below
+ # 1Gbps. That wouldn't saturate egress and MC would thus get through,
+ # seemingly winning bandwidth on account of UC. Demand at least 2Gbps
+ # average ingress rate to somewhat mitigate this.
+ local min_ingress=2147483648
+
+ for i in {5..0}; do
+ local t0=$(ethtool_stats_get $host_in $counter)
+ local u0=$(ethtool_stats_get $sw_in $counter)
+ sleep $interval
+ local t1=$(ethtool_stats_get $host_in $counter)
+ local u1=$(ethtool_stats_get $sw_in $counter)
+
+ local ir=$(rate $u0 $u1 $interval)
+ local er=$(rate $t0 $t1 $interval)
+
+ if check_rate $ir $min_ingress "$what ingress rate"; then
+ break
+ fi
+
+ # Fail the test if we can't get the throughput.
+ if ((i == 0)); then
+ ret=1
+ fi
+ done
+
+ echo $ir $er
+ return $ret
+}
+
+bail_on_lldpad()
+{
+ if systemctl is-active --quiet lldpad; then
+
+ cat >/dev/stderr <<-EOF
+ WARNING: lldpad is running
+
+ lldpad will likely configure DCB, and this test will
+ configure Qdiscs. mlxsw does not support both at the
+ same time, one of them is arbitrarily going to overwrite
+ the other. That will cause spurious failures (or,
+ unlikely, passes) of this test.
+ EOF
+
+ if [[ -z $ALLOW_LLDPAD ]]; then
+ cat >/dev/stderr <<-EOF
+
+ If you want to run the test anyway, please set
+ an environment variable ALLOW_LLDPAD to a
+ non-empty string.
+ EOF
+ exit 1
+ else
+ return
+ fi
+ fi
+}