bpf: lb: un-break terminating backends for service without backend #31840
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Continue to forward traffic for established connections, even when a service loses its last active backends. This needs a small adjustment in a BPF test that was relying on this behaviour. Fixes: 1835011 ("bpf: drop SVC traffic if no backend is available") Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
Once a LB connection has been established, we expect to continue using its CT entry to obtain the backend. Even if the backend is in terminating state, and the service has lost all of its backends. Keeping this separate from the fix, in case we can't easily backport. Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
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This was referenced Apr 19, 2024
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Discussing with @borkmann we realized that service LB for established connections no longer works, if the service loses the last of its active backends. This was broken by #22388, which introduced the
svc->countcheck too early in the code path.