On 2026-02-27 09:13, Jakub Kicinski wrote:
io_uring defers zcrx context teardown to the iou_exit workqueue.
# ps aux | grep iou
... 07:58 0:00 [kworker/u19:0-iou_exit]
... 07:58 0:00 [kworker/u18:2-iou_exit]
When the test's receiver process exits, bkg() returns but the memory
provider may still be attached to the rx queue. The subsequent defer()
that restores tcp-data-split then fails:
# Exception while handling defer / cleanup (callback 3 of 3)!
# Defer Exception| net.ynl.pyynl.lib.ynl.NlError:
Netlink error: can't disable tcp-data-split while device has
memory provider enabled: Invalid argument
not ok 1 iou-zcrx.test_zcrx.single
Add a helper that polls netdev queue-get until no rx queue reports
the io-uring memory provider attribute. Register it as a defer()
just before tcp-data-split is restored as a "barrier".
Signed-off-by: Jakub Kicinski <[email protected]>
---
CC: [email protected]
CC: [email protected]
CC: [email protected]
CC: [email protected]
---
.../selftests/drivers/net/hw/iou-zcrx.py | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
b/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
index c63d6d6450d2..c27c2064701d 100755
--- a/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
+++ b/tools/testing/selftests/drivers/net/hw/iou-zcrx.py
@@ -2,14 +2,27 @@
# SPDX-License-Identifier: GPL-2.0
import re
+import time
from os import path
from lib.py import ksft_run, ksft_exit, KsftSkipEx, ksft_variants,
KsftNamedVariant
from lib.py import NetDrvEpEnv
from lib.py import bkg, cmd, defer, ethtool, rand_port, wait_port_listen
-from lib.py import EthtoolFamily
+from lib.py import EthtoolFamily, NetdevFamily
SKIP_CODE = 42
+
+def mp_clear_wait(cfg):
+ """Wait for io_uring memory providers to clear from all device queues."""
+ deadline = time.time() + 5
This is potentially a very long time to wait if code is buggy, as I
found out when debugging netkit queue lease. How about reducing this to
say 1 second?
