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Message-ID: <2b9c7d6b-0fa4-404a-9fbb-80f581c2f294@gmail.com> Date: Wed, 31 May 2023 15:02:17 +0300 From: Tariq Toukan <ttoukan.linux@...il.com> To: Martin KaFai Lau <martin.lau@...ux.dev> Cc: brouer@...hat.com, Daniel Borkmann <daniel@...earbox.net>, Jesper Dangaard Brouer <hawk@...nel.org>, bpf@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org, Gal Pressman <gal@...dia.com>, Nimrod Oren <noren@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Lorenzo Bianconi <lorenzo.bianconi@...hat.com>, drosen@...gle.com, Joanne Koong <joannelkoong@...il.com>, henning.fehrmann@....mpg.de, oliver.behnke@....mpg.de, Jesper Dangaard Brouer <jbrouer@...hat.com>, Alexei Starovoitov <ast@...nel.org>, John Fastabend <john.fastabend@...il.com>, Jakub Kicinski <kuba@...nel.org> Subject: Re: [PATCH bpf-next 1/2] samples/bpf: fixup xdp_redirect tool to be able to support xdp multibuffer On 30/05/2023 20:22, Martin KaFai Lau wrote: > On 5/30/23 6:40 AM, Tariq Toukan wrote: >>>> I initiated a discussion on this topic a few months ago. dynptr was >>>> accepted since then, but I'm not aware of any in-progress followup >>>> work that addresses this. >>>> >>> >>> Are you saying some more work is needed on dynptr? >>> >> >> AFAIU yes. >> But I might be wrong... I need to revisit this. >> Do you think/know that dynptr can be used immediately? > > Not sure if you are aware of the bpf_dynptr_slice[_rdwr]() which could > be useful here. It only does a copy when the requested slice is across > different frags: > https://lore.kernel.org/all/20230301154953.641654-10-joannelkoong@gmail.com/ > Thanks for the pointer. I missed it. Looks promising! I'll take a deeper look soon and do some perf tests.
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