loader: insert policy programs before attaching bpf entrypoints, enforce missed tail calls in ci-e2e #30248
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See code comments for a detailed description of the problem. This commit installs policy programs before attaching tc/xdp hooks since doing things in the wrong order means dropping tail calls when handling traffic if the policy programs aren't inserted. Signed-off-by: Timo Beckers <timo@isovalent.com>
Signed-off-by: Timo Beckers <timo@isovalent.com>
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This did 8 consecutive successful rounds of ci-e2e, so I'm calling it. No more missing tail calls (for now)! Marking this as ready for review. (Aside from hitting #30266 on a few occasions, of course.) |
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This was referenced Feb 13, 2024
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Since the early days of Cilium, we would miss tail calls in CI and not really monitor when or how these happened. Many improvements have been made in recent months to make these a thing of the past, but they were still occurring with host-fw enabled.
After the most recent round of fixes, most of these errors disappeared, but one bugbear remained. This PR addresses the final outstanding error in ordering prog array insertions:
Finally, strictly enforce no missed tail calls in all ci-e2e scenarios.
Fixes: #29476