passt/README.md, branch 2026_01_17.81c97f6

tcp: Limit advertised window to available, not total sending buffer size

2025-12-08T07:03:23+00:00

For non-local connections, we advertise the same window size as what
the peer in turn advertises to us, and limit it to the buffer size
reported via SO_SNDBUF.

That's not quite correct: in order to later avoid failures while
queueing data to the socket, we need to limit the window to the
available buffer size, not the total one.

Use the SIOCOUTQ ioctl and subtract the number of outbound queued
bytes from the total buffer size, then clamp to this value.

Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson

Add CONTRIBUTING.md

2025-09-18T15:17:10+00:00

Signed-off-by: Yumei Huang 
Reviewed-by: David Gibson 
Signed-off-by: Stefano Brivio

treewide: Flush pcap and log files, if used, before exiting

2025-08-19T14:29:52+00:00

I didn't imagine that occasionally truncated pcap and log files, as a
result of commit d0006fa784a7 ("treewide: use _exit() over exit()"),
would be such a big deal, until I tried to debug TCP issues with this
beauty:

  while true; do ./pasta --trace -l /tmp/pasta.log -p /tmp/pasta.pcap --config-net -t 5555 -- socat TCP-LISTEN:5555 OPEN:/tmp/large.rcv,trunc & (sleep 0.3; socat -T2 OPEN:large.bin TCP:88.198.0.164:5555; ); wait; diff large.bin /tmp/large.rcv || break; done

...flush files and pcap if we're using them. Ignore fsync() errors for
the log file as we obviously can't reliably log them.

Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson

README: Mark vhost-user as supported

2024-12-12T09:50:48+00:00

Signed-off-by: Stefano Brivio

README: pasta is indeed a supported back-end for rootless Docker

2024-08-21T10:05:26+00:00

...https://github.com/moby/moby/issues/48257 just reminded me.

Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson

Fix typo in README file

2024-07-29T17:02:35+00:00

- remove duplicated 'the' in the 'Services' section

Signed-off-by: AbdAlRahman Gad 
Reviewed-by: David Gibson 
Signed-off-by: Stefano Brivio

README.md: Alpine, Guix and OpenSUSE now have packages for passt

2024-04-05T10:12:23+00:00

Signed-off-by: Stefano Brivio 
Reviewed-by: David Gibson

README: Default SLAAC prefix comes from address (not prefix) on host

2023-12-30T10:45:27+00:00

Reported-by: Yalan Zhang 
Signed-off-by: Stefano Brivio

README: Fix broken link to CentOS Stream package

2023-12-30T10:45:27+00:00

Signed-off-by: Stefano Brivio

README: Update "Availability" section

2023-12-27T18:29:45+00:00

It's been a while -- there are now official packages for Arch Linux,
Gentoo, Void Linux.

Suggested-by: Rahil Bhimjiani 
Reviewed-by: David Gibson 
Signed-off-by: Stefano Brivio