From: Jakub Kicinski <kuba@kernel.org>
To: Amery Hung <ameryhung@gmail.com>
Cc: Nimrod Oren <noren@nvidia.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org,
alexei.starovoitov@gmail.com, andrii@kernel.org,
daniel@iogearbox.net, martin.lau@kernel.org,
mohsin.bashr@gmail.com, saeedm@nvidia.com, tariqt@nvidia.com,
mbloch@nvidia.com, maciej.fijalkowski@intel.com,
kernel-team@meta.com, Dragos Tatulea <dtatulea@nvidia.com>
Subject: Re: [RFC bpf-next v1 0/7] Add kfunc bpf_xdp_pull_data
Date: Fri, 29 Aug 2025 17:09:29 -0700 [thread overview]
Message-ID: <20250829170929.28cfac72@kernel.org> (raw)
In-Reply-To: <CAMB2axPpaoDfFEBzNTaTjp4GnFKtWy0k-sTez56ap+FBZzLFeA@mail.gmail.com>
On Fri, 29 Aug 2025 00:26:29 -0700 Amery Hung wrote:
> > I'm currently working on a series that converts the xdp_native program
> > to use dynptr for accessing header data. If accepted, it should provide
> > better performance, since dynptr can access without copying the data.
>
> I feel that bpf_xdp_pull_data() is a more generic approach, but yeah
> dynptr may yield better performance. Looking forward to seeing the
> numbers.
To be 100% clear, being able to push and pull custom UDP encap headers
(that the NIC may not even be able to parse) is one of the main use
cases for XDP, for L3 load balances. dynptr may be slower or faster
for reading and writing to the packet, but it can't push or pull.
So this is a bit of a side conversation. Sorry if I'm stating the
obvious.
next prev parent reply other threads:[~2025-08-30 0:09 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-25 19:39 [RFC bpf-next v1 0/7] Add kfunc bpf_xdp_pull_data Amery Hung
2025-08-25 19:39 ` [RFC bpf-next v1 1/7] net/mlx5e: Fix generating skb from nonlinear xdp_buff Amery Hung
2025-08-27 13:45 ` Dragos Tatulea
2025-08-28 3:44 ` Amery Hung
2025-08-28 16:23 ` Dragos Tatulea
2025-08-28 13:41 ` Nimrod Oren
2025-08-25 19:39 ` [RFC bpf-next v1 2/7] bpf: Allow bpf_xdp_shrink_data to shrink a frag from head and tail Amery Hung
2025-08-28 13:43 ` Nimrod Oren
2025-08-25 19:39 ` [RFC bpf-next v1 3/7] bpf: Support pulling non-linear xdp data Amery Hung
2025-08-25 21:29 ` Stanislav Fomichev
2025-08-25 22:23 ` Amery Hung
2025-08-25 22:29 ` Jakub Kicinski
2025-08-25 22:36 ` Amery Hung
2025-08-25 22:46 ` Stanislav Fomichev
2025-08-25 22:58 ` Jakub Kicinski
2025-08-26 0:12 ` Stanislav Fomichev
2025-08-26 0:30 ` Jakub Kicinski
2025-08-25 22:39 ` Jakub Kicinski
2025-08-26 5:12 ` Amery Hung
2025-08-26 13:20 ` Jakub Kicinski
2025-08-26 13:44 ` Amery Hung
2025-08-25 19:39 ` [RFC bpf-next v1 4/7] bpf: Clear packet pointers after changing packet data in kfuncs Amery Hung
2025-08-25 19:39 ` [RFC bpf-next v1 5/7] bpf: Support specifying linear xdp packet data size in test_run Amery Hung
2025-08-25 19:39 ` [RFC bpf-next v1 6/7] selftests/bpf: Test bpf_xdp_pull_data Amery Hung
2025-08-25 19:39 ` [RFC bpf-next v1 7/7] selftests: drv-net: Pull data before parsing headers Amery Hung
2025-08-25 22:41 ` [RFC bpf-next v1 0/7] Add kfunc bpf_xdp_pull_data Jakub Kicinski
2025-08-26 19:38 ` Gal Pressman
2025-08-28 13:39 ` Nimrod Oren
2025-08-29 7:26 ` Amery Hung
2025-08-30 0:09 ` Jakub Kicinski [this message]
2025-08-29 18:21 ` Martin KaFai Lau
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