[patch net-next 5/6] selftests: forwarding: add wait_for_dev() helper

[Jiri Pirko]

From: Jiri Pirko <j...@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 <j...@nvidia.com>
---
 tools/testing/selftests/net/forwarding/lib.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/testing/selftests/net/forwarding/lib.sh 
b/tools/testing/selftests/net/forwarding/lib.sh
index 959183b516ce..74859f969997 100644
--- a/tools/testing/selftests/net/forwarding/lib.sh
+++ b/tools/testing/selftests/net/forwarding/lib.sh
@@ -746,6 +746,25 @@ setup_wait()
        sleep $WAIT_TIME
 }
 
+wait_for_dev()
+{
+       local dev=$1; shift
+       local timeout=${1:-$WAIT_TIMEOUT}; shift
+       local max_iterations=$(($timeout * 10))
+
+       for ((i = 1; i <= $max_iterations; ++i)); do
+               ip link show dev $dev up &> /dev/null
+               if [[ $? -ne 0 ]]; then
+                       sleep 0.1
+               else
+                       return 0
+               fi
+       done
+
+       log_test wait_for_dev ": Interface $dev did not appear."
+       exit 1
+}
+
 cmd_jq()
 {
        local cmd=$1
-- 
2.44.0