From: Jesper Dangaard Brouer <jbrouer@redhat.com>
To: Jakub Kicinski <kuba@kernel.org>,
Alexander Duyck <alexander.duyck@gmail.com>
Cc: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>,
Lorenzo Bianconi <lorenzo@kernel.org>, bpf <bpf@vger.kernel.org>,
Netdev <netdev@vger.kernel.org>,
David Miller <davem@davemloft.net>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
shayagr@amazon.com, "Jubran, Samih" <sameehj@amazon.com>,
John Fastabend <john.fastabend@gmail.com>,
David Ahern <dsahern@kernel.org>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Eelco Chaudron <echaudro@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Saeed Mahameed <saeed@kernel.org>,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>,
"Karlsson, Magnus" <magnus.karlsson@intel.com>,
Tirthendu <tirthendu.sarkar@intel.com>
Subject: Re: [PATCH v9 bpf-next 01/14] net: skbuff: add data_len field to skb_shared_info
Date: Tue, 29 Jun 2021 21:11:28 +0200 [thread overview]
Message-ID: <e0b50540-0055-1f5c-af5f-0cd26616693a@redhat.com> (raw)
In-Reply-To: <20210629113714.6d8e2445@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
On 29/06/2021 20.37, Jakub Kicinski wrote:
> On Tue, 29 Jun 2021 11:18:38 -0700 Alexander Duyck wrote:
>> On Tue, Jun 29, 2021 at 10:08 AM Jakub Kicinski <kuba@kernel.org> wrote:
>>>> ack, I agree. I will fix it in v10.
>>> Why is XDP mb incompatible with LRO? I thought that was one of the use
>>> cases (mentioned by Willem IIRC).
>> XDP is meant to be a per packet operation with support for TX and
>> REDIRECT, and LRO isn't routable. So we could put together a large LRO
>> frame but we wouldn't be able to break it apart again. If we allow
>> that then we are going to need a ton more exception handling added to
>> the XDP paths.
>>
>> As far as GSO it would require setting many more fields in order to
>> actually make it offloadable by any hardware.
> It would require more work, but TSO seems to be explicitly stated
> as what the series builds towards (in the cover letter). It's fine
> to make choices we'd need to redo later, I guess, I'm just trying
> to understand the why.
This is also my understanding that LRO and TSO is what this patchset is
working towards.
Sorry, I don't agree or understand this requested change.
next prev parent reply other threads:[~2021-06-29 19:11 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 12:49 [PATCH v9 bpf-next 00/14] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 01/14] net: skbuff: add data_len field to skb_shared_info Lorenzo Bianconi
2021-06-28 19:58 ` Alexander Duyck
2021-06-29 12:44 ` Lorenzo Bianconi
2021-06-29 17:08 ` Jakub Kicinski
2021-06-29 18:18 ` Alexander Duyck
2021-06-29 18:37 ` Jakub Kicinski
2021-06-29 19:11 ` Jesper Dangaard Brouer [this message]
2021-06-29 19:18 ` Lorenzo Bianconi
2021-06-29 20:45 ` Alexander Duyck
2021-06-14 12:49 ` [PATCH v9 bpf-next 02/14] xdp: introduce flags field in xdp_buff/xdp_frame Lorenzo Bianconi
2021-06-28 20:14 ` Alexander Duyck
2021-06-29 12:43 ` Lorenzo Bianconi
2021-06-29 13:07 ` Alexander Duyck
2021-06-29 13:25 ` Lorenzo Bianconi
2021-07-05 15:52 ` Lorenzo Bianconi
2021-07-05 21:35 ` Alexander Duyck
2021-07-06 11:53 ` Lorenzo Bianconi
2021-07-06 14:04 ` Alexander Duyck
2021-07-06 17:47 ` Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 03/14] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 04/14] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 05/14] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 06/14] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 07/14] net: xdp: add multi-buff support to xdp_build_skb_from_frame Lorenzo Bianconi
2021-06-28 21:05 ` Alexander Duyck
2021-06-29 18:34 ` Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 08/14] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2021-06-22 23:37 ` John Fastabend
2021-06-24 9:26 ` Eelco Chaudron
2021-06-24 14:24 ` John Fastabend
2021-06-24 15:16 ` Zvi Effron
2021-06-29 13:19 ` Lorenzo Bianconi
2021-06-29 13:27 ` Toke Høiland-Jørgensen
2021-07-06 21:44 ` Backwards compatibility for XDP multi-buff (was: Re: [PATCH v9 bpf-next 08/14] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API) Toke Høiland-Jørgensen
2021-06-14 12:49 ` [PATCH v9 bpf-next 09/14] bpf: introduce bpf_xdp_get_buff_len helper Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 10/14] bpf: add multi-buffer support to xdp copy helpers Lorenzo Bianconi
2021-06-22 23:49 ` John Fastabend
2021-06-24 9:42 ` Eelco Chaudron
2021-06-24 14:28 ` John Fastabend
2021-06-25 8:25 ` Eelco Chaudron
2021-06-29 13:23 ` Lorenzo Bianconi
2021-07-06 10:15 ` Eelco Chaudron
2021-06-14 12:49 ` [PATCH v9 bpf-next 11/14] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 12/14] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 13/14] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2021-06-14 12:49 ` [PATCH v9 bpf-next 14/14] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi
2021-06-22 23:18 ` [PATCH v9 bpf-next 00/14] mvneta: introduce XDP multi-buffer support John Fastabend
2021-06-23 3:41 ` David Ahern
2021-06-23 5:48 ` John Fastabend
2021-06-23 14:40 ` David Ahern
2021-06-24 14:22 ` John Fastabend
2021-07-01 7:56 ` Magnus Karlsson
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