From: Alexander Lobakin <aleksander.lobakin@intel.com>
To: Jakub Kicinski <kuba@kernel.org>,
Larysa Zaremba <larysa.zaremba@intel.com>
Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
sdf@google.com, haoluo@google.com, 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, netdev@vger.kernel.org,
Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Simon Horman <simon.horman@corigine.com>,
Tariq Toukan <tariqt@mellanox.com>,
Saeed Mahameed <saeedm@mellanox.com>,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: [xdp-hints] Re: [RFC bpf-next v2 09/24] xdp: Add VLAN tag hint
Date: Tue, 3 Oct 2023 15:09:39 +0200 [thread overview]
Message-ID: <8e9d830b-556b-b8e6-45df-0bf7971b4237@intel.com> (raw)
In-Reply-To: <20231003053519.74ae8938@kernel.org>
From: Jakub Kicinski <kuba@kernel.org>
Date: Tue, 3 Oct 2023 05:35:19 -0700
> On Wed, 27 Sep 2023 09:51:09 +0200 Larysa Zaremba wrote:
>> Implement functionality that enables drivers to expose VLAN tag
>> to XDP code.
>>
>> VLAN tag is represented by 2 variables:
>> - protocol ID, which is passed to bpf code in BE
>> - VLAN TCI, in host byte order
>
> Sorry for a random chime-in but was there any discussion about
> the validity of VLAN stripping as an offload?
>
> I always thought this is a legacy "Windows" thing which allowed
> Windows drivers to operate on VLAN-tagged networks even before
> the OS itself understood VLANs... Do people actually care about
> having it enabled?
On MIPS routers, I actually have some perf gains from having it enabled.
So they do, I'd say. Mediatek even has DSA tag stripping. Both save you
some skb->data push-pulls, csum corrections when CHECKSUM_COMPLETE, skb
unsharing in some cases, reduce L3/L4 headers cacheline spanning etc.
Thanks,
Olek
next prev parent reply other threads:[~2023-10-03 13:10 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-27 7:51 [xdp-hints] [RFC bpf-next v2 00/24] XDP metadata via kfuncs for ice + mlx5 Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 01/24] ice: make RX hash reading code more reusable Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 02/24] ice: make RX HW timestamp " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 03/24] ice: make RX checksum checking " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 04/24] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 05/24] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 06/24] ice: Support HW timestamp hint Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 07/24] ice: Support RX hash XDP hint Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 08/24] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 09/24] xdp: Add VLAN tag hint Larysa Zaremba
2023-10-03 12:35 ` [xdp-hints] " Jakub Kicinski
2023-10-03 13:09 ` Alexander Lobakin [this message]
2023-10-04 18:08 ` Jakub Kicinski
2023-10-05 16:58 ` Alexander Lobakin
2023-10-05 17:16 ` Jakub Kicinski
2023-10-05 17:20 ` David Ahern
2023-10-05 18:06 ` Jakub Kicinski
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 10/24] ice: Implement " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 11/24] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 12/24] xdp: Add checksum hint Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 13/24] ice: Implement " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 14/24] ice: put XDP meta sources assignment under a static key condition Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 15/24] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 16/24] net, xdp: allow metadata > 32 Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 17/24] selftests/bpf: Add flags and new hints to xdp_hw_metadata Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 18/24] veth: Implement VLAN tag and checksum XDP hint Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 19/24] net: make vlan_get_tag() return -ENODATA instead of -EINVAL Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 20/24] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 21/24] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 22/24] selftests/bpf: check checksum state " Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 23/24] mlx5: implement VLAN tag XDP hint Larysa Zaremba
2023-09-27 7:51 ` [xdp-hints] [RFC bpf-next v2 24/24] mlx5: implement RX checksum " Larysa Zaremba
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