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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Stanislav Fomichev <sdf@google.com>,
	John Fastabend <john.fastabend@gmail.com>,
	Martin KaFai Lau <martin.lau@linux.dev>,
	bpf <bpf@vger.kernel.org>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>, Song Liu <song@kernel.org>,
	Yonghong Song <yhs@fb.com>, KP Singh <kpsingh@kernel.org>,
	Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
	David Ahern <dsahern@gmail.com>, Jakub Kicinski <kuba@kernel.org>,
	Willem de Bruijn <willemb@google.com>,
	Jesper Dangaard Brouer <brouer@redhat.com>,
	Anatoly Burakov <anatoly.burakov@intel.com>,
	Alexander Lobakin <alexandr.lobakin@intel.com>,
	Magnus Karlsson <magnus.karlsson@gmail.com>,
	Maryam Tahhan <mtahhan@redhat.com>,
	xdp-hints@xdp-project.net,
	Network Development <netdev@vger.kernel.org>
Subject: Re: [xdp-hints] Re: [PATCH bpf-next 05/11] veth: Support rx timestamp metadata for xdp
Date: Thu, 17 Nov 2022 16:02:54 -0800	[thread overview]
Message-ID: <CAADnVQJ=MbwUOTtmYb_VmTEBA8SdYXJryfGoYv2W2US3_Es=kA@mail.gmail.com> (raw)
In-Reply-To: <874juxywih.fsf@toke.dk>

On Thu, Nov 17, 2022 at 3:46 PM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> >
> > Ack. I can replace the unrolling with something that just resolves
> > "generic" kfuncs to the per-driver implementation maybe? That would at
> > least avoid netdev->ndo_kfunc_xxx indirect calls at runtime..
>
> As stated above, I think we should keep the unrolling. If we end up with
> an actual CALL instruction for every piece of metadata that's going to
> suck performance-wise; unrolling is how we keep this fast enough! :)

Let's start with pure kfuncs without requiring drivers
to provide corresponding bpf asm.
If pure kfuncs will indeed turn out to be perf limiting
then we'll decide on how to optimize them.

  reply	other threads:[~2022-11-18  0:03 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-15  3:01 [PATCH bpf-next 00/11] xdp: hints via kfuncs Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 01/11] bpf: Document XDP RX metadata Stanislav Fomichev
2022-11-15 22:31   ` Zvi Effron
2022-11-15 22:43     ` Stanislav Fomichev
2022-11-15 23:34       ` Zvi Effron
2022-11-16  3:50         ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 02/11] bpf: Introduce bpf_patch Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 03/11] bpf: Support inlined/unrolled kfuncs for xdp metadata Stanislav Fomichev
2022-11-15 16:16   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 18:37     ` Stanislav Fomichev
2022-11-16 20:42   ` Jakub Kicinski
2022-11-16 20:53     ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 04/11] bpf: Implement hidden BPF_PUSH64 and BPF_POP64 instructions Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 05/11] veth: Support rx timestamp metadata for xdp Stanislav Fomichev
2022-11-15 16:17   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 18:37     ` Stanislav Fomichev
2022-11-15 22:46       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  4:09         ` Stanislav Fomichev
2022-11-16  6:38           ` John Fastabend
2022-11-16  7:47             ` Martin KaFai Lau
2022-11-16 10:08               ` Toke Høiland-Jørgensen
2022-11-16 18:20                 ` Martin KaFai Lau
2022-11-16 19:03                 ` John Fastabend
2022-11-16 20:50                   ` Stanislav Fomichev
2022-11-16 23:47                     ` John Fastabend
2022-11-17  0:19                       ` Stanislav Fomichev
2022-11-17  2:17                         ` Alexei Starovoitov
2022-11-17  2:53                           ` Stanislav Fomichev
2022-11-17  2:59                             ` Alexei Starovoitov
2022-11-17  4:18                               ` Stanislav Fomichev
2022-11-17  6:55                                 ` John Fastabend
2022-11-17 17:51                                   ` Stanislav Fomichev
2022-11-17 19:47                                     ` John Fastabend
2022-11-17 20:17                                       ` Alexei Starovoitov
2022-11-17 11:32                             ` Toke Høiland-Jørgensen
2022-11-17 16:59                               ` Alexei Starovoitov
2022-11-17 17:52                                 ` Stanislav Fomichev
2022-11-17 23:46                                   ` Toke Høiland-Jørgensen
2022-11-18  0:02                                     ` Alexei Starovoitov [this message]
2022-11-18  0:29                                       ` Toke Høiland-Jørgensen
2022-11-17 10:27                       ` Toke Høiland-Jørgensen
2022-11-15  3:02 ` [PATCH bpf-next 06/11] xdp: Carry over xdp metadata into skb context Stanislav Fomichev
2022-11-15 23:20   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  3:49     ` Stanislav Fomichev
2022-11-16  9:30       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  4:40   ` kernel test robot
2022-11-16  7:04   ` Martin KaFai Lau
2022-11-16  9:48     ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16 20:51       ` Stanislav Fomichev
2022-11-16 20:51     ` Stanislav Fomichev
2022-11-16  8:22   ` kernel test robot
2022-11-16  9:03   ` kernel test robot
2022-11-16 13:46   ` kernel test robot
2022-11-16 21:12   ` Jakub Kicinski
2022-11-16 21:49     ` Martin KaFai Lau
2022-11-18 14:05   ` Jesper Dangaard Brouer
2022-11-18 18:18     ` Stanislav Fomichev
2022-11-19 12:31       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-21 17:53         ` Stanislav Fomichev
2022-11-21 18:47           ` Jakub Kicinski
2022-11-21 19:41             ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 07/11] selftests/bpf: Verify xdp_metadata xdp->af_xdp path Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 08/11] selftests/bpf: Verify xdp_metadata xdp->skb path Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 09/11] mlx4: Introduce mlx4_xdp_buff wrapper for xdp_buff Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 10/11] mxl4: Support rx timestamp metadata for xdp Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 11/11] selftests/bpf: Simple program to dump XDP RX metadata Stanislav Fomichev
2022-11-15 15:54 ` [xdp-hints] [PATCH bpf-next 00/11] xdp: hints via kfuncs Toke Høiland-Jørgensen
2022-11-15 18:37   ` Stanislav Fomichev
2022-11-15 22:31     ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 22:54     ` [xdp-hints] " Alexei Starovoitov
2022-11-15 23:13       ` [xdp-hints] " Toke Høiland-Jørgensen

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