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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:07 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:17 +0200 |
| commit | 9260319e7411ff8281700a532caa436f40120ec4 (patch) | |
| tree | 2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/2362.toml | |
| parent | 225caa38269323af1bfc2daadff5ec8bd930747f (diff) | |
| download | qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.tar.gz qemu-analysis-9260319e7411ff8281700a532caa436f40120ec4.zip | |
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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, 0 insertions, 73 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 deleted file mode 100644 index fd5664422..000000000 --- a/gitlab/issues/target_missing/host_missing/accel_missing/2362.toml +++ /dev/null @@ -1,73 +0,0 @@ -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" |