From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Stanislav Fomichev <sdf@google.com>
Cc: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
bpf <bpf@vger.kernel.org>, "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Song Liu" <song@kernel.org>, "Yonghong Song" <yhs@fb.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>, "Hao Luo" <haoluo@google.com>,
"Jiri Olsa" <jolsa@kernel.org>,
"Jakub Kicinski" <kuba@kernel.org>,
"Toke Høiland-Jørgensen" <toke@kernel.org>,
"Willem de Bruijn" <willemb@google.com>,
"David Ahern" <dsahern@kernel.org>,
"Karlsson, Magnus" <magnus.karlsson@intel.com>,
"Björn Töpel" <bjorn@kernel.org>,
"Fijalkowski, Maciej" <maciej.fijalkowski@intel.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Network Development" <netdev@vger.kernel.org>,
xdp-hints@xdp-project.net
Subject: [xdp-hints] Re: [RFC bpf-next v3 09/14] net/mlx5e: Implement devtx kfuncs
Date: Wed, 12 Jul 2023 12:28:34 -0400 [thread overview]
Message-ID: <CAF=yD-JMq=6MJGbpyf0knR+k9zfs4b1k7NqutM49WYqHmeH2nQ@mail.gmail.com> (raw)
In-Reply-To: <CAF=yD-LO=LDWhKM--r9F119-J_9v-Znm4saxFrhhxhMV6nnmJQ@mail.gmail.com>
On Wed, Jul 12, 2023 at 11:16 AM Willem de Bruijn
<willemdebruijn.kernel@gmail.com> wrote:
>
> On Wed, Jul 12, 2023 at 1:36 AM Stanislav Fomichev <sdf@google.com> wrote:
> >
> > On Tue, Jul 11, 2023 at 9:59 PM Alexei Starovoitov
> > <alexei.starovoitov@gmail.com> wrote:
> > >
> > > On Tue, Jul 11, 2023 at 8:29 PM Stanislav Fomichev <sdf@google.com> wrote:
> > > >
> > > >
> > > > This will slow things down, but not to the point where it's on par
> > > > with doing sw checksum. At least in theory.
> > > > We can't stay at skb when using AF_XDP. AF_XDP would benefit from having
> > > > the offloads.
> > >
> > > To clarify: yes, AF_XDP needs generalized HW offloads.
> >
> > Great! To reiterate, I'm mostly interested in af_xdp wrt tx
> > timestamps. So if the consensus is not to mix xdp-tx and af_xdp-tx,
> > I'm fine with switching to adding some fixed af_xdp descriptor format
> > to enable offloads on tx.
> >
> > > I just don't see how xdp tx offloads are moving a needle in that direction.
> >
> > Let me try to explain how both might be similar, maybe I wasn't clear
> > enough on that.
> > For af_xdp tx packet, the userspace puts something in the af_xdp frame
> > metadata area (headrom) which then gets executed/interpreted by the
> > bpf program at devtx (which calls kfuncs to enable particular
> > offloads).
> > IOW, instead of defining some fixed layout for the tx offloads, the
> > userspace and bpf program have some agreement on the layout (and bpf
> > program "applies" the offloads by calling the kfuncs).
> > Also (in theory) the same hooks can be used for xdp-tx.
> > Does it make sense? But, again, happy to scratch that whole idea if
> > we're fine with a fixed layout for af_xdp.
>
> Checksum offload is an important demonstrator too.
>
> It is admittedly a non-trivial one. Checksum offload has often been
> discussed as a pain point ("protocol ossification").
>
> In general, drivers can accept every CHECKSUM_COMPLETE skb that
Erm.. CHECKSUM_PARTIAL
next prev parent reply other threads:[~2023-07-12 16:29 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-07 19:29 [xdp-hints] [RFC bpf-next v3 00/14] bpf: Netdev TX metadata Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 01/14] bpf: Rename some xdp-metadata functions into dev-bound Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 02/14] bpf: Make it easier to add new metadata kfunc Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 03/14] xsk: Support XDP_TX_METADATA_LEN Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 04/14] bpf: Implement devtx hook points Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 05/14] bpf: Implement devtx timestamp kfunc Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 06/14] net: veth: Implement devtx timestamp kfuncs Stanislav Fomichev
2023-07-07 19:29 ` [xdp-hints] [RFC bpf-next v3 07/14] bpf: Introduce tx checksum devtx kfuncs Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 08/14] net: veth: Implement devtx tx checksum Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 09/14] net/mlx5e: Implement devtx kfuncs Stanislav Fomichev
2023-07-11 22:56 ` [xdp-hints] " Alexei Starovoitov
2023-07-11 23:24 ` Stanislav Fomichev
2023-07-11 23:45 ` Alexei Starovoitov
2023-07-12 0:14 ` Stanislav Fomichev
2023-07-12 2:50 ` Alexei Starovoitov
2023-07-12 3:29 ` Stanislav Fomichev
2023-07-12 4:59 ` Alexei Starovoitov
2023-07-12 5:36 ` Stanislav Fomichev
2023-07-12 15:16 ` Willem de Bruijn
2023-07-12 16:28 ` Willem de Bruijn [this message]
2023-07-12 19:03 ` Alexei Starovoitov
2023-07-12 19:11 ` Willem de Bruijn
2023-07-12 19:42 ` Alexei Starovoitov
2023-07-12 20:09 ` Jakub Kicinski
2023-07-12 20:53 ` Stanislav Fomichev
2023-07-12 0:32 ` Jakub Kicinski
2023-07-12 2:37 ` Alexei Starovoitov
2023-07-12 3:07 ` Jakub Kicinski
2023-07-12 3:23 ` Alexei Starovoitov
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 10/14] selftests/xsk: Support XDP_TX_METADATA_LEN Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 11/14] selftests/bpf: Add helper to query current netns cookie Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 12/14] selftests/bpf: Add csum helpers Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 13/14] selftests/bpf: Extend xdp_metadata with devtx kfuncs Stanislav Fomichev
2023-07-07 19:30 ` [xdp-hints] [RFC bpf-next v3 14/14] selftests/bpf: Extend xdp_hw_metadata " Stanislav Fomichev
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