netdev - Re: [patch net-next v2 5/6] selftests: forwarding: add wait_for

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Zh2enn9ArVKDrdIy@f4>
Date: Mon, 15 Apr 2024 17:39:42 -0400
From: Benjamin Poirier <benjamin.poirier@...il.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, 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, idosch@...dia.com,
	virtualization@...ts.linux.dev
Subject: Re: [patch net-next v2 5/6] selftests: forwarding: add
 wait_for_dev() helper

On 2024-04-15 18:25 +0200, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.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@...dia.com>
> ---
> 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 254698c6ba56..e85b361dc85d 100644
> --- a/tools/testing/selftests/net/forwarding/lib.sh
> +++ b/tools/testing/selftests/net/forwarding/lib.sh
> @@ -746,6 +746,19 @@ 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 up &> /dev/null

Sorry, I just noticed that this includes the "up" flag. I was confused
for a while until I realized that `ip` returns success even if the
interface is not up:

# ip link set dev eth1 down
# ip link show dev eth1 up
# echo $?
0

So wait_for_dev() really does just wait for the device to appear, not
for it to be up. If you agree, please remove the 'up' keyword to avoid
confusion.