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

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Message-Id: <20220615151721.404596-1-jakub@cloudflare.com>
Date:   Wed, 15 Jun 2022 17:17:19 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        kernel-team@...udflare.com
Subject: [PATCH bpf-next 0/2] Fix tail call counting with bpf2bpf

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

-- 
2.35.3