[patch net-next v5 repost 4/5] selftests: forwarding: add wait_for_dev() helper

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

The existing setup_wait*() helper family check the status of the
interface to be up. Introduce wait_for_dev() to wait for the netdevice
to appear, for example after test script does manual device bind.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
---
v3->v4:
- removed "up" from ip link command line
v1->v2:
- reworked wait_for_dev() helper to use slowwait() helper
---
 tools/testing/selftests/net/forwarding/lib.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh
index 00e089dd951d..94751993321c 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -733,6 +733,19 @@ setup_wait()
 	sleep $WAIT_TIME
 }
 
+wait_for_dev()
+{
+        local dev=$1; shift
+        local timeout=${1:-$WAIT_TIMEOUT}; shift
+
+        slowwait $timeout ip link show dev $dev &> /dev/null
+        if (( $? )); then
+                check_err 1
+                log_test wait_for_dev "Interface $dev did not appear."
+                exit $EXIT_STATUS
+        fi
+}
+
 cmd_jq()
 {
 	local cmd=$1
-- 
2.44.0