netdev - Re: [PATCH] Add skb_store_bytes() for BPF_PROG_TYPE_CGROUP

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Message-ID: <20211229210549.ocscvmftojxcqq3x@kafai-mbp.dhcp.thefacebook.com>
Date:   Wed, 29 Dec 2021 13:05:49 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Tyler Wear <twear@...cinc.com>
CC:     Yonghong Song <yhs@...com>,
        "Tyler Wear (QUIC)" <quic_twear@...cinc.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "maze@...gle.com" <maze@...gle.com>
Subject: Re: [PATCH] Add skb_store_bytes() for BPF_PROG_TYPE_CGROUP_SKB

On Wed, Dec 29, 2021 at 06:29:05PM +0000, Tyler Wear wrote:
> Unable to run any bpf tests do to errors below. These occur with and without the new patch. Is this a known issue?
> Is the new test case required since bpf_skb_store_bytes() is already a tested function for other prog types?
> 
> libbpf: failed to find BTF for extern 'bpf_testmod_invalid_mod_kfunc' [18] section: -2
> Error: failed to open BPF object file: No such file or directory
> libbpf: failed to find BTF info for global/extern symbol 'my_tid'
> Error: failed to link '/local/mnt/workspace/linux-stable/tools/testing/selftests/bpf/linked_funcs1.o': Unknown error -2 (-2)
> libbpf: failed to find BTF for extern 'bpf_kfunc_call_test1' [27] section: -2
tools/testing/selftests/bpf/README.rst has details on these.

Ensure the llvm and pahole are up to date.
Also take a look at the "Testing patches" and "LLVM" section
in Documentation/bpf/bpf_devel_QA.rst.