[bpf-next,0/2] Fix tail call counting with bpf2bpf

Message

Jakub Sitnicki June 15, 2022, 3:17 p.m. UTC

When working on extending aarch64 JIT to support mixing bpf2bpf with tailcalls,
I ran into what looks like a bug in x64 JIT. Please see patch 1.  Patch 2 adds a
test so that we don't regress.

Jakub Sitnicki (2):
  bpf, x86: Fix tail call count offset calculation on bpf2bpf call
  selftests/bpf: Test tail call counting with bpf2bpf and data on stack

 arch/x86/net/bpf_jit_comp.c                   |  3 +-
 .../selftests/bpf/prog_tests/tailcalls.c      | 55 +++++++++++++++++++
 .../selftests/bpf/progs/tailcall_bpf2bpf6.c   | 42 ++++++++++++++
 3 files changed, 99 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/progs/tailcall_bpf2bpf6.c