net: selftests: Add lanes setting test

Test that setting lanes parameter is working.

Set max speed and max lanes in the list of advertised link modes,
and then try to set max speed with the lanes below max lanes if exists
in the list.

And then, test that setting number of lanes larger than max lanes fails.

Do the above for both autoneg on and off.

$ ./ethtool_lanes.sh

TEST: 4 lanes is autonegotiated                                     [ OK ]
TEST: Lanes number larger than max width is not set                 [ OK ]
TEST: Autoneg off, 4 lanes detected during force mode               [ OK ]
TEST: Lanes number larger than max width is not set                 [ OK ]

Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 62 insertions, 0 deletions

diff --git a/tools/testing/selftests/net/forwarding/ethtool_lib.sh b/tools/testing/selftests/net/forwarding/ethtool_lib.sh
index 9188e624dec0..b9bfb45085af 100644
--- a/tools/testing/selftests/net/forwarding/ethtool_lib.sh
+++ b/tools/testing/selftests/net/forwarding/ethtool_lib.sh
@@ -22,6 +22,40 @@ ethtool_set()
 	check_err $out "error in configuration. $cmd"
 }
 
+dev_linkmodes_params_get()
+{
+	local dev=$1; shift
+	local adver=$1; shift
+	local -a linkmodes_params
+	local param_count
+	local arr
+
+	if (($adver)); then
+		mode="Advertised link modes"
+	else
+		mode="Supported link modes"
+	fi
+
+	local -a dev_linkmodes=($(dev_speeds_get $dev 1 $adver))
+	for ((i=0; i<${#dev_linkmodes[@]}; i++)); do
+		linkmodes_params[$i]=$(echo -e "${dev_linkmodes[$i]}" | \
+			# Replaces all non numbers with spaces
+			sed -e 's/[^0-9]/ /g' | \
+			# Squeeze spaces in sequence to 1 space
+			tr -s ' ')
+		# Count how many numbers were found in the linkmode
+		param_count=$(echo "${linkmodes_params[$i]}" | wc -w)
+		if [[ $param_count -eq 1 ]]; then
+			linkmodes_params[$i]="${linkmodes_params[$i]} 1"
+		elif [[ $param_count -ge 3 ]]; then
+			arr=(${linkmodes_params[$i]})
+			# Take only first two params
+			linkmodes_params[$i]=$(echo "${arr[@]:0:2}")
+		fi
+	done
+	echo ${linkmodes_params[@]}
+}
+
 dev_speeds_get()
 {
 	local dev=$1; shift
diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 98ea37d26c44..40b3a86a62cf 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -69,6 +69,15 @@ check_tc_action_hw_stats_support()
 	fi
 }
 
+check_ethtool_lanes_support()
+{
+	ethtool --help 2>&1| grep lanes &> /dev/null
+	if [[ $? -ne 0 ]]; then
+		echo "SKIP: ethtool too old; it is missing lanes support"
+		exit 1
+	fi
+}
+
 if [[ "$(id -u)" -ne 0 ]]; then
 	echo "SKIP: need root privileges"
 	exit 0
@@ -263,6 +272,20 @@ not()
 	[[ $? != 0 ]]
 }
 
+get_max()
+{
+	local arr=("$@")
+
+	max=${arr[0]}
+	for cur in ${arr[@]}; do
+		if [[ $cur -gt $max ]]; then
+			max=$cur
+		fi
+	done
+
+	echo $max
+}
+
 grep_bridge_fdb()
 {
 	local addr=$1; shift
@@ -279,6 +302,11 @@ grep_bridge_fdb()
 	$@ | grep $addr | grep $flag "$word"
 }
 
+wait_for_port_up()
+{
+	"$@" | grep -q "Link detected: yes"
+}
+
 wait_for_offload()
 {
 	"$@" | grep -q offload