netdev - Re: [PATCH v2 bpf-next 4/6] selftests/bpf: Add IPv4 and IPv6 sockaddr test cases

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Message-ID: <CADKFtnQHy0MFeDNg6x2gzUJpuyaF6ELLyMg3tTxze3XV28qo7w@mail.gmail.com>
Date: Thu, 18 Apr 2024 12:37:49 -0400
From: Jordan Rife <jrife@...gle.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: bpf@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>, 
	Kui-Feng Lee <thinker.li@...il.com>, Artem Savkov <asavkov@...hat.com>, 
	Dave Marchevsky <davemarchevsky@...com>, Menglong Dong <imagedong@...cent.com>, Daniel Xu <dxu@...uu.xyz>, 
	David Vernet <void@...ifault.com>, Daan De Meyer <daan.j.demeyer@...il.com>, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH v2 bpf-next 4/6] selftests/bpf: Add IPv4 and IPv6 sockaddr
 test cases

> The test_sock_addr.{c,sh} can be retired as long as all its tests are migrated
> to sock_addr.c

test_sock_addr.c has a few more test dimensions than
prog_tests/sock_addr.c currently does, so it covers a few more
scenarios.

struct sock_addr_test {
    const char *descr;
    /* BPF prog properties */
    load_fn loadfn;
    enum bpf_attach_type expected_attach_type;
    enum bpf_attach_type attach_type;
    /* Socket properties */
    int domain;
    int type;
    /* IP:port pairs for BPF prog to override */
    const char *requested_ip;
    unsigned short requested_port;
    const char *expected_ip;
    unsigned short expected_port;
    const char *expected_src_ip;
    /* Expected test result */
    enum {
        LOAD_REJECT,
        ATTACH_REJECT,
        ATTACH_OKAY,
        SYSCALL_EPERM,
        SYSCALL_ENOTSUPP,
        SUCCESS,
    } expected_result;
};

We focus on the "happy path" scenarios currently in
prog_tests/sock_addr.c while test_sock_addr.c has test cases that
cover a range of scenarios where loading or attaching a BPF program
should fail. There are also a few asm tests that use program loader
functions like sendmsg4_rw_asm_prog_load which specifies a series of
BPF instructions directly rather than loading one of the skeletons.
Adding in these test dimensions and migrating the test cases is a
slightly bigger lift for this patch series. Do we want to try to
migrate all of these to prog_tests/sock_addr.c in order to fully
retire it?

-Jordan