bpf: encap: fix ifindex in TO_OVERLAY trace notification #33083
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The encap helpers were meant to abstract from differences between TC and XDP. Therefore ctx_set_encap_info() provides the ifindex for TC, and setting the ifindex also indicates that a redirect to encap interface is possible (rather than manually adding the overlay headers + FIB lookup). The downside is that __encap_with_nodeid() for TC currently emits a trace notification without the ifindex set to ENCAP_IFINDEX. Fix this up manually by moving the `ifindex` initialization up. Reported-by: Tomasz Tarczyński <tomasz.tarczynski@isovalent.com> Signed-off-by: Julian Wiedmann <jwi@isovalent.com>
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ysksuzuki
approved these changes
Jun 14, 2024
2 tasks
This was referenced Jul 10, 2024
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The encap helpers were meant to abstract from differences between TC and XDP. Therefore ctx_set_encap_info() provides the ifindex for TC, and setting the ifindex also indicates that a redirect to encap interface is possible (rather than manually adding the overlay headers + FIB lookup).
The downside is that __encap_with_nodeid() for TC currently emits a trace notification without the ifindex set to ENCAP_IFINDEX.
Fix this up manually by moving the
ifindexinitialization up.