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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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c347fb0ff8
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> Acked-by: Michael S. Tsirkin <mst@redhat.com> Link: https://patch.msgid.link/20250425071018.36078-5-minhquangbui99@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
60 lines
2.1 KiB
Python
Executable file
60 lines
2.1 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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# This is intended to be run on a virtio-net guest interface.
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# The test binds the XDP socket to the interface without setting
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# the fill ring to trigger delayed refill_work. This helps to
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# make it easier to reproduce the deadlock when XDP program,
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# XDP socket bind/unbind, rx ring resize race with refill_work on
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# the buggy kernel.
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#
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# The Qemu command to setup virtio-net
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# -netdev tap,id=hostnet1,vhost=on,script=no,downscript=no
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# -device virtio-net-pci,netdev=hostnet1,iommu_platform=on,disable-legacy=on
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from lib.py import ksft_exit, ksft_run
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from lib.py import KsftSkipEx, KsftFailEx
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from lib.py import NetDrvEnv
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from lib.py import bkg, ip, cmd, ethtool
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import time
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def _get_rx_ring_entries(cfg):
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output = ethtool(f"-g {cfg.ifname}", json=True)
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return output[0]["rx"]
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def setup_xsk(cfg, xdp_queue_id = 0) -> bkg:
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# Probe for support
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xdp = cmd(f'{cfg.net_lib_dir / "xdp_helper"} - -', fail=False)
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if xdp.ret == 255:
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raise KsftSkipEx('AF_XDP unsupported')
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elif xdp.ret > 0:
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raise KsftFailEx('unable to create AF_XDP socket')
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try:
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return bkg(f'{cfg.net_lib_dir / "xdp_helper"} {cfg.ifindex} ' \
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'{xdp_queue_id} -z', ksft_wait=3)
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except:
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raise KsftSkipEx('Failed to bind XDP socket in zerocopy.\n' \
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'Please consider adding iommu_platform=on ' \
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'when setting up virtio-net-pci')
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def check_xdp_bind(cfg):
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with setup_xsk(cfg):
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ip(f"link set dev %s xdp obj %s sec xdp" %
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(cfg.ifname, cfg.net_lib_dir / "xdp_dummy.bpf.o"))
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ip(f"link set dev %s xdp off" % cfg.ifname)
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def check_rx_resize(cfg):
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with setup_xsk(cfg):
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rx_ring = _get_rx_ring_entries(cfg)
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ethtool(f"-G %s rx %d" % (cfg.ifname, rx_ring // 2))
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ethtool(f"-G %s rx %d" % (cfg.ifname, rx_ring))
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def main():
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with NetDrvEnv(__file__, nsim_test=False) as cfg:
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ksft_run([check_xdp_bind, check_rx_resize],
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args=(cfg, ))
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ksft_exit()
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if __name__ == "__main__":
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main()
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