From: Menglong Dong <menglong.dong@linux.dev>
To: Menglong Dong <menglong8.dong@gmail.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
jiang.biao@linux.dev, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
bpf <bpf@vger.kernel.org>,
Network Development <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH bpf-next v8 05/11] bpf: support fsession for bpf_session_cookie
Date: Sat, 10 Jan 2026 11:38:11 +0800 [thread overview]
Message-ID: <2401703.ElGaqSPkdT@7950hx> (raw)
In-Reply-To: <CAADnVQJtyGS5BQKcnzsqRNEDO7Kcs_89k6Q5tBi10iaff=tbtQ@mail.gmail.com>
On 2026/1/10 10:42, Alexei Starovoitov wrote:
> On Wed, Jan 7, 2026 at 6:26 PM Menglong Dong <menglong8.dong@gmail.com> wrote:
> >
> >
> > +u64 *bpf_fsession_cookie(void *ctx)
> > +{
> > + /* This helper call is inlined by verifier. */
> > + u64 off = (((u64 *)ctx)[-1] >> BPF_TRAMP_M_COOKIE) & 0xFF;
> > +
> > + return &((u64 *)ctx)[-off];
> > +}
>
> Same question... this can be a comment.
> For some of the helpers earlier we kept C functions to make
> things work on architectures where JIT is not available,
> but kfuncs require JIT, so for kfuncs there is no fallback necessary.
Yeah, it make sense.
>
>
next prev parent reply other threads:[~2026-01-10 3:38 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-08 2:24 [PATCH bpf-next v8 00/11] bpf: fsession support Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 01/11] bpf: add " Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 02/11] bpf: use last 8-bits for the nr_args in trampoline Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 03/11] bpf: change prototype of bpf_session_{cookie,is_return} Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 04/11] bpf: support fsession for bpf_session_is_return Menglong Dong
2026-01-10 2:40 ` Alexei Starovoitov
2026-01-10 3:37 ` Menglong Dong
2026-01-10 4:04 ` Menglong Dong
2026-01-10 6:05 ` Alexei Starovoitov
2026-01-10 6:16 ` Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 05/11] bpf: support fsession for bpf_session_cookie Menglong Dong
2026-01-10 2:42 ` Alexei Starovoitov
2026-01-10 3:38 ` Menglong Dong [this message]
2026-01-08 2:24 ` [PATCH bpf-next v8 06/11] bpf,x86: introduce emit_st_r0_imm64() for trampoline Menglong Dong
2026-01-10 2:45 ` Alexei Starovoitov
2026-01-10 3:40 ` Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 07/11] bpf,x86: add fsession support for x86_64 Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 08/11] libbpf: add fsession support Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 09/11] selftests/bpf: add testcases for fsession Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 10/11] selftests/bpf: add testcases for fsession cookie Menglong Dong
2026-01-08 2:24 ` [PATCH bpf-next v8 11/11] selftests/bpf: test fsession mixed with fentry and fexit Menglong Dong
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