netdev - [patch net-next 3/6] selftests: forwarding: add ability to assemble NETIFS array by driver name

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Message-ID: <20240412151314.3365034-4-jiri@resnulli.us>
Date: Fri, 12 Apr 2024 17:13:11 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	parav@...dia.com,
	mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	shuah@...nel.org,
	petrm@...dia.com,
	liuhangbin@...il.com,
	vladimir.oltean@....com,
	bpoirier@...dia.com,
	idosch@...dia.com,
	virtualization@...ts.linux.dev
Subject: [patch net-next 3/6] selftests: forwarding: add ability to assemble NETIFS array by driver name

From: Jiri Pirko <jiri@...dia.com>

Allow driver tests to work without specifying the netdevice names.
Introduce a possibility to search for available netdevices according to
set driver name. Allow test to specify the name by setting
NETIF_FIND_DRIVER variable.

Note that user overrides this either by passing netdevice names on the
command line or by declaring NETIFS array in custom forwarding.config
configuration file.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 6f6a0f13465f..06633518b3aa 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -55,6 +55,9 @@ declare -A NETIFS=(
 : "${NETIF_CREATE:=yes}"
 : "${NETIF_TYPE:=veth}"
 
+# Whether to find netdevice according to the specified driver.
+: "${NETIF_FIND_DRIVER:=}"
+
 # Constants for ping tests:
 # How many packets should be sent.
 : "${PING_COUNT:=10}"
@@ -94,6 +97,42 @@ if [[ ! -v NUM_NETIFS ]]; then
 	exit $ksft_skip
 fi
 
+##############################################################################
+# Find netifs by test-specified driver name
+
+driver_name_get()
+{
+	local dev=$1; shift
+	local driver_path="/sys/class/net/$dev/device/driver"
+
+	if [ ! -L $driver_path ]; then
+		echo ""
+	else
+		basename `realpath $driver_path`
+	fi
+}
+
+find_netif()
+{
+	local ifnames=`ip -j -p link show | jq -e -r ".[].ifname"`
+	local count=0
+
+	for ifname in $ifnames
+	do
+		local driver_name=`driver_name_get $ifname`
+		if [[ ! -z $driver_name && $driver_name == $NETIF_FIND_DRIVER ]]; then
+			count=$((count + 1))
+			NETIFS[p$count]="$ifname"
+		fi
+	done
+}
+
+if [[ ! -z $NETIF_FIND_DRIVER ]]; then
+	unset NETIFS
+	declare -A NETIFS
+	find_netif
+fi
+
 net_forwarding_dir=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
 
 if [[ -f $net_forwarding_dir/forwarding.config ]]; then
-- 
2.44.0