[PATCH v4 4/4] selftests: net: add a virtio_net deadlock selftest

[Bui Quang Minh <minhquangbui99@gmail.com>]

The selftest reproduces the deadlock scenario when binding/unbinding XDP
program, XDP socket, rx ring resize on virtio_net interface.

Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
---
 .../testing/selftests/drivers/net/hw/Makefile |  1 +
 .../selftests/drivers/net/hw/virtio_net.py    | 65 +++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100755 tools/testing/selftests/drivers/net/hw/virtio_net.py

diff --git a/tools/testing/selftests/drivers/net/hw/Makefile b/tools/testing/selftests/drivers/net/hw/Makefile
index 07cddb19ba35..b5af7c1412bf 100644
--- a/tools/testing/selftests/drivers/net/hw/Makefile
+++ b/tools/testing/selftests/drivers/net/hw/Makefile
@@ -21,6 +21,7 @@ TEST_PROGS = \
 	rss_ctx.py \
 	rss_input_xfrm.py \
 	tso.py \
+	virtio_net.py \
 	#
 
 TEST_FILES := \
diff --git a/tools/testing/selftests/drivers/net/hw/virtio_net.py b/tools/testing/selftests/drivers/net/hw/virtio_net.py
new file mode 100755
index 000000000000..7cad7ab98635
--- /dev/null
+++ b/tools/testing/selftests/drivers/net/hw/virtio_net.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0
+
+# This is intended to be run on a virtio-net guest interface.
+# The test binds the XDP socket to the interface without setting
+# the fill ring to trigger delayed refill_work. This helps to
+# make it easier to reproduce the deadlock when XDP program,
+# XDP socket bind/unbind, rx ring resize race with refill_work on
+# the buggy kernel.
+#
+# The Qemu command to setup virtio-net
+# -netdev tap,id=hostnet1,vhost=on,script=no,downscript=no
+# -device virtio-net-pci,netdev=hostnet1,iommu_platform=on,disable-legacy=on
+
+from lib.py import ksft_exit, ksft_run
+from lib.py import KsftSkipEx, KsftFailEx
+from lib.py import NetDrvEnv
+from lib.py import bkg, ip, cmd, ethtool
+import re
+
+def _get_rx_ring_entries(cfg):
+    output = ethtool(f"-g {cfg.ifname}").stdout
+    values = re.findall(r'RX:\s+(\d+)', output)
+    return int(values[1])
+
+def setup_xsk(cfg, xdp_queue_id = 0) -> bkg:
+    # Probe for support
+    xdp = cmd(f'{cfg.net_lib_dir / "xdp_helper"} - -', fail=False)
+    if xdp.ret == 255:
+        raise KsftSkipEx('AF_XDP unsupported')
+    elif xdp.ret > 0:
+        raise KsftFailEx('unable to create AF_XDP socket')
+
+    try:
+        xsk_bkg = bkg(f'{cfg.net_lib_dir / "xdp_helper"} {cfg.ifindex} ' \
+                      '{xdp_queue_id} -z', ksft_wait=3)
+        return xsk_bkg
+    except:
+        raise KsftSkipEx('Failed to bind XDP socket in zerocopy. ' \
+                         'Please consider adding iommu_platform=on ' \
+                         'when setting up virtio-net-pci')
+
+def check_xdp_bind(cfg):
+    ip(f"link set dev %s xdp obj %s sec xdp" %
+       (cfg.ifname, cfg.net_lib_dir / "xdp_dummy.bpf.o"))
+    ip(f"link set dev %s xdp off" % cfg.ifname)
+
+def check_rx_resize(cfg, queue_size = 128):
+    rx_ring = _get_rx_ring_entries(cfg)
+    ethtool(f"-G %s rx %d" % (cfg.ifname, queue_size))
+    ethtool(f"-G %s rx %d" % (cfg.ifname, rx_ring))
+
+def main():
+    with NetDrvEnv(__file__, nsim_test=False) as cfg:
+        try:
+            xsk_bkg = setup_xsk(cfg)
+        except KsftSkipEx as e:
+            print(f"WARN: xsk pool is not set up, err: {e}")
+
+        ksft_run([check_xdp_bind, check_rx_resize],
+                 args=(cfg, ))
+    ksft_exit()
+
+if __name__ == "__main__":
+    main()
-- 
2.43.0