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Diffstat (limited to 'gitlab/issues/target_missing/host_missing/accel_missing/2362.toml')
| -rw-r--r-- | gitlab/issues/target_missing/host_missing/accel_missing/2362.toml | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/gitlab/issues/target_missing/host_missing/accel_missing/2362.toml b/gitlab/issues/target_missing/host_missing/accel_missing/2362.toml new file mode 100644 index 00000000..fd566442 --- /dev/null +++ b/gitlab/issues/target_missing/host_missing/accel_missing/2362.toml @@ -0,0 +1,73 @@ +id = 2362 +title = "short packets dropped by some network cards when using certain network backends" +state = "opened" +created_at = "2024-05-25T06:11:31.383Z" +closed_at = "n/a" +labels = [] +url = "https://gitlab.com/qemu-project/qemu/-/issues/2362" +host-os = "various" +host-arch = "n/a" +qemu-version = "9.0.0" +guest-os = "various" +guest-arch = "n/a" +description = """Effectively a duplicate of https://gitlab.com/qemu-project/qemu/-/issues/2058 -- short ethernet packets (such as ARP packets) are discarded by various networking devices now. + +QEMU previously padded ethernet frames to 64 bytes when some network cards received them, but this was removed in various commits (140eae9c8f760e9260356fe9b56b802a02f0a9d2, c445f200ad241b443aa7a61a5381b26f56a18f0e, c58da33f2f8410b6f22cd1d33377dadf3a4d8867, 05db4476c5d25e437d807175de9f862bf5bf732c, 6d0d261dbfa6122e9b3bdcab7d934ca49f069c21, 63b901bfd30a0975bc326ba8527880fabac2e66, aee87b43fe2206acb8f5e334b42790df33a1cbad). + +969e50b61a285b0cc8dea6d4d2ade3f758d5ecc7 fixed SLIRP and TAP support, however the other various network backends (socket, dgram, vde, others) all have the same issue that some network cards will reject short packets. + +This does not fail on older versions of QEMU.""" +reproduce = """I have a python script that shows connecting two VMs of your choice using a socketpair connected to one of the affected NIC types (pcnet). If you start your OS (I used alpine linux as my test), and give each VM a unique IP address (eg, `ip addr add 192.168.0.1/24 dev eth0`), ping will fail to work. When you run tcpdump, you can see that the OS is sending out short ARP packets, but the other VM cannot see them. + +Using an older version of QEMU allows the ping to succeed. + +```python +#!/usr/bin/env python3 + +import argparse +import shlex +import socket +import subprocess + + +QEMU_PATH = "bin/qemu-system-x86_64" +NIC = "pcnet" +vnc = True + +if __name__ == "__main__": + parser = argparse.ArgumentParser() + parser.add_argument("qcow") + args = parser.parse_args() + + p1, p2 = socket.socketpair() + + qargs1 = [ + QEMU_PATH, "-snapshot", + "-m", "2G", + "-drive", f"file={args.qcow}", + "-device", f"{NIC},netdev=n,mac=52:54:00:00:00:01", + "-netdev", f"socket,id=n,fd={p1.fileno()}" + ] + if vnc: + qargs1 += ["-display", "vnc=:2"] + + print("+", shlex.join(qargs1)) + proc1 = subprocess.Popen(qargs1, pass_fds=[p1.fileno()]) + + qargs2 = [ + QEMU_PATH, "-snapshot", + "-m", "2G", + "-drive", f"file={args.qcow}", + "-device", f"{NIC},netdev=n,mac=52:54:00:00:00:02", + "-netdev", f"socket,id=n,fd={p2.fileno()}" + ] + if vnc: + qargs2 += ["-display", "vnc=:3"] + + print("+", shlex.join(qargs2)) + proc2 = subprocess.Popen(qargs2, pass_fds=[p2.fileno()]) + + proc1.wait() + proc2.wait() +```""" +additional = "n/a" |