From: Jakub Kicinski <kuba@kernel.org>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Larysa Zaremba <larysa.zaremba@intel.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>,
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, 31 Jul 2023 09:43:22 -0700 [thread overview]
Message-ID: <20230731094322.0edd5c6b@kernel.org> (raw)
In-Reply-To: <64c661de227c2_11bfb629493@willemb.c.googlers.com.notmuch>
On Sun, 30 Jul 2023 09:13:02 -0400 Willem de Bruijn wrote:
> > > This levels business is an unfortunate side effect of
> > > CHECKSUM_UNNECESSARY. For a packet with multiple checksum fields, what
> > > does the boolean actually mean? With these levels, at least that is
> > > well defined: the first N checksum fields.
> >
> > If I understand this correctly this is intel specific feature that
> > other NICs don't have. skb layer also doesn't have such concept.
> > The driver should say CHECKSUM_UNNECESSARY when it's sure
> > or don't pretend that it checks the checksum and just say NONE.
>
> I did not know how much this was used, but quick grep for non constant
> csum_level shows devices from at least six vendors.
I thought it was a legacy thing from early VxLAN days.
We used to leave outer UDP csum as 0 before LCO, and therefore couldn't
convert outer to COMPLETE, so inner could not be offloaded/validated.
Should not be all that relevant today.
next prev parent reply other threads:[~2023-07-31 16:43 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
2023-08-07 15:32 ` Larysa Zaremba
2023-08-07 17:06 ` Stanislav Fomichev
2023-07-31 16:43 ` Jakub Kicinski [this message]
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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