[dpdk-dev] [PATCH] bpf: fix pseudo calls for BPF programs loaded from ELF
thomas at monjalon.net
Wed Jun 5 18:33:28 CEST 2019
17/05/2019 16:09, Konstantin Ananyev:
> clang 6.0 and onwards, for the external function call generates
> BPF_PSEUDO_CALL instruction:
> call pseudo +-off -> call another bpf function.
> More details about that change: https://lwn.net/Articles/741773/
> DPDK BPF implementation right now doesn't support multiple BPF
> functions per module.
> To overcome that problem, and preserve existing functionality
> (ability to call allowed by user external functions),
> bpf_elf_load() clears EBPF_PSEUDO_CALL value.
> For details how to reproduce the issue:
> Fixes: 5dba93ae5f2d ("bpf: add ability to load eBPF program from ELF object file")
> Cc: stable at dpdk.org
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
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