[PATCHv2 net] selftests/net/lib: update busywait timeout value

[PATCHv2 net] selftests/net/lib: update busywait timeout value

[Hangbin Liu]

The busywait timeout value is a millisecond, not a second. So the
current setting 2 is too small. On slow/busy host (or VMs) the
current timeout can expire even on "correct" execution, causing random
failures. Let's copy the WAIT_TIMEOUT from forwarding/lib.sh and set
BUSYWAIT_TIMEOUT here.

Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
---
v2: add fixes flag. update possible failures.
---
 tools/testing/selftests/net/lib.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/lib.sh b/tools/testing/selftests/net/lib.sh
index dca549443801..f9fe182dfbd4 100644
--- a/tools/testing/selftests/net/lib.sh
+++ b/tools/testing/selftests/net/lib.sh
@@ -4,6 +4,9 @@
 ##############################################################################
 # Defines
 
+WAIT_TIMEOUT=${WAIT_TIMEOUT:=20}
+BUSYWAIT_TIMEOUT=$((WAIT_TIMEOUT * 1000)) # ms
+
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 # namespace list created by setup_ns
@@ -48,7 +51,7 @@ cleanup_ns()
 
 	for ns in "$@"; do
 		ip netns delete "${ns}" &> /dev/null
-		if ! busywait 2 ip netns list \| grep -vq "^$ns$" &> /dev/null; then
+		if ! busywait $BUSYWAIT_TIMEOUT ip netns list \| grep -vq "^$ns$" &> /dev/null; then
 			echo "Warn: Failed to remove namespace $ns"
 			ret=1
 		fi
-- 
2.43.0

Re: [PATCHv2 net] selftests/net/lib: update busywait timeout value

[Simon Horman]

On Wed, Jan 24, 2024 at 02:13:44PM +0800, Hangbin Liu wrote:
> The busywait timeout value is a millisecond, not a second. So the
> current setting 2 is too small. On slow/busy host (or VMs) the
> current timeout can expire even on "correct" execution, causing random
> failures. Let's copy the WAIT_TIMEOUT from forwarding/lib.sh and set
> BUSYWAIT_TIMEOUT here.
> 
> Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCHv2 net] selftests/net/lib: update busywait timeout value

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 24 Jan 2024 14:13:44 +0800 you wrote:
> The busywait timeout value is a millisecond, not a second. So the
> current setting 2 is too small. On slow/busy host (or VMs) the
> current timeout can expire even on "correct" execution, causing random
> failures. Let's copy the WAIT_TIMEOUT from forwarding/lib.sh and set
> BUSYWAIT_TIMEOUT here.
> 
> Fixes: 25ae948b4478 ("selftests/net: add lib.sh")
> Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
> 
> [...]

Here is the summary with links:
  - [PATCHv2,net] selftests/net/lib: update busywait timeout value
    https://git.kernel.org/netdev/net/c/fc836129f708

You are awesome, thank you!
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