On Fri, Sep 25, 2026 at 12:45 AM Jeff Jo <[email protected]> wrote: > > Add a regression test for a gap-filling packet whose acknowledgment has > become old. Linux first sends data to the peer. Deliver two peer data > packets out of order: the later packet acknowledges Linux's data, while > the delayed packet still carries the earlier acknowledgment. > > Require the ACK that closes the receive gap to echo the delayed packet's > timestamp, 301000. Without the fix, Linux accepts the data but still echoes > the previously saved timestamp, 1000. Also check that the application can > read all 34 bytes. > > Use a large jump in peer timestamps to represent the idle interval, with > no real wait, loss or retransmission. The test directly checks the outgoing > timestamp echo. It requires packetdrill's merged TSecr verification fix > (linked below); older tools incorrectly pass on an unfixed kernel. > > Use the existing packetdrill selftest runner for IPv4, IPv6 and > IPv4-mapped IPv6. > > Link: > https://github.com/google/packetdrill/commit/83f72d3f9085d0e26eb4d206fe4d7cfab5b6d872 > Assisted-by: LLM > Signed-off-by: Jeff Jo <[email protected]>
Reviewed-by: Eric Dumazet <[email protected]> Thanks!
