From: Larysa Zaremba <larysa.zaremba@intel.com>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.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>,
Stanislav Fomichev <sdf@google.com>, 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>,
Simon Horman <simon.horman@corigine.com>
Subject: [xdp-hints] Re: [PATCH bpf-next v4 12/21] xdp: Add checksum hint
Date: Mon, 7 Aug 2023 17:03:21 +0200 [thread overview]
Message-ID: <ZNEHuaY+9LWzfZMt@lincoln> (raw)
In-Reply-To: <64ca59bfbb1cd_294ce929467@willemb.c.googlers.com.notmuch>
On Wed, Aug 02, 2023 at 09:27:27AM -0400, Willem de Bruijn wrote:
> > No. What I'm saying is that XDP_CHECKSUM_UNNECESSARY should be
> > equivalent to skb's CHECKSUM_UNNECESSARY with csum_level = 0.
> > I'm well aware that some drivers are trying to be smart and put csum_level=1.
> > There is no use case for it in XDP.
> > "But our HW supports it so XDP prog should read it" is the reason NOT
> > to expose it to bpf in generic api.
> >
> > Either we're doing per-driver kfuncs and no common infra or common kfunc
> > that covers 99% of the drivers. Which is CHECKSUM_UNNECESSARY && csum_level = 0
> >
> > It's not acceptable to present a generic api to xdp prog with multi level
> > csum that only works on a specific HW. Next thing there will be new flags
> > and MAX_CSUM_LEVEL in XDP features.
> > Pretending to be generic while being HW specific is the worst interface.
>
> Ok. Agreed that without it we still cover 99% of the use cases. Fine to drop.
Sorry for the late response.
Thanks everyone for the feedback, will drop the checksum level concept from the
design.
next prev parent reply other threads:[~2023-08-07 15:09 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-28 15:44 [xdp-hints] (no subject) Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 01/21] ice: make RX hash reading code more reusable Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 02/21] ice: make RX HW timestamp " Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 03/21] ice: make RX checksum checking " Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 04/21] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 05/21] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 06/21] ice: Support HW timestamp hint Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 07/21] ice: Support RX hash XDP hint Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 08/21] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 09/21] xdp: Add VLAN tag hint Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 10/21] ice: Implement " Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 11/21] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 12/21] xdp: Add checksum hint Larysa Zaremba
2023-07-28 21:53 ` [xdp-hints] " Alexei Starovoitov
2023-07-29 16:15 ` Willem de Bruijn
2023-07-29 18:04 ` Alexei Starovoitov
2023-07-30 13:13 ` Willem de Bruijn
2023-07-31 10:52 ` Larysa Zaremba
2023-08-01 1:03 ` Alexei Starovoitov
2023-08-02 13:27 ` Willem de Bruijn
2023-08-07 15:03 ` Larysa Zaremba [this message]
2023-08-07 15:32 ` Larysa Zaremba
2023-08-07 17:06 ` Stanislav Fomichev
2023-07-31 16:43 ` Jakub Kicinski
2023-08-07 15:08 ` Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 13/21] ice: Implement " Larysa Zaremba
2023-07-28 21:02 ` [xdp-hints] " kernel test robot
2023-07-28 21:02 ` kernel test robot
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 14/21] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 15/21] net, xdp: allow metadata > 32 Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 16/21] selftests/bpf: Add flags and new hints to xdp_hw_metadata Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 17/21] veth: Implement VLAN tag and checksum XDP hint Larysa Zaremba
2023-07-29 22:13 ` [xdp-hints] " kernel test robot
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 18/21] net: make vlan_get_tag() return -ENODATA instead of -EINVAL Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 19/21] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 20/21] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba
2023-07-28 17:39 ` [xdp-hints] [PATCH bpf-next v4 21/21] selftests/bpf: check checksum state " Larysa Zaremba
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