netdev - Re: [bpf-next v2] bpf: drop deprecated bpf_jit

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Message-ID: <26e09ae3-dc7a-858d-c15c-7c2ff080d36d@csgroup.eu>
Date:   Mon, 23 Jan 2023 07:57:46 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Quentin Monnet <quentin@...valent.com>,
        Tonghao Zhang <tong@...ragraf.org>,
        Andrii Nakryiko <andrii@...nel.org>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "loongarch@...ts.linux.dev" <loongarch@...ts.linux.dev>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        Hao Luo <haoluo@...gle.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Song Liu <song@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>, Hou Tao <houtao1@...wei.com>,
        KP Singh <kpsingh@...nel.org>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        "naveen.n.rao@...ux.ibm.com" <naveen.n.rao@...ux.ibm.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>
Subject: Re: [bpf-next v2] bpf: drop deprecated bpf_jit_enable == 2



Le 17/01/2023 à 16:42, Quentin Monnet a écrit :
> 
> In the meantime, you could disable the use of skeletons in bpftool, by
> removing "clang-bpf-co-re" from FEATURE_TESTS from the Makefile. You
> should get a functional binary, which would only miss a few features
> (namely, printing the pids of programs holding references to BPF
> programs, and the "bpftool prog profile" command).

Ok, with "clang-bpf-co-re" removed, bpftool doesn't complain.

However, does it work at all ?

I started a 'tcpdump', I confirmed with ' bpf_jit_enable == 2' that a 
BPF jitted program is created by tcpdump.

'bptool prog show' and 'bpftool prog list' returns no result.

Christophe