From: Jakub Kicinski <kuba@kernel.org>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: sameehj@amazon.com, netdev@vger.kernel.org, bpf@vger.kernel.org,
zorik@amazon.com, akiyano@amazon.com, gtzalik@amazon.com,
"Toke Høiland-Jørgensen" <toke@toke.dk>,
"Daniel Borkmann" <borkmann@iogearbox.net>,
"Alexei Starovoitov" <alexei.starovoitov@gmail.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Alexander Duyck" <alexander.duyck@gmail.com>,
"Jeff Kirsher" <jeffrey.t.kirsher@intel.com>,
"David Ahern" <dsahern@gmail.com>,
"Willem de Bruijn" <willemdebruijn.kernel@gmail.com>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Lorenzo Bianconi" <lorenzo@kernel.org>
Subject: Re: [PATCH RFC v1 01/15] xdp: add frame size to xdp_buff
Date: Tue, 17 Mar 2020 13:42:43 -0700 [thread overview]
Message-ID: <20200317134243.3c29a324@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <158446615272.702578.2884467013936153419.stgit@firesoul>
On Tue, 17 Mar 2020 18:29:12 +0100 Jesper Dangaard Brouer wrote:
> XDP have evolved to support several frame sizes, but xdp_buff was not
> updated with this information. The frame size (frame_sz) member of
> xdp_buff is introduced to know the real size of the memory the frame is
> delivered in.
>
> When introducing this also make it clear that some tailroom is
> reserved/required when creating SKBs using build_skb().
>
> It would also have been an option to introduce a pointer to
> data_hard_end (with reserved offset). The advantage with frame_sz is
> that (like rxq) drivers only need to setup/assign this value once per
> NAPI cycle. Due to XDP-generic (and some drivers) it's not possible to
> store frame_sz inside xdp_rxq_info, because it's varies per packet as it
> can be based/depend on packet length.
Do you reckon it would be too ugly to make xdp-generic suffer and have
it set the length in rxq per packet? We shouldn't handle multiple
packets from the same rxq in parallel, no?
next prev parent reply other threads:[~2020-03-17 20:42 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-17 17:29 [PATCH RFC v1 00/15] XDP extend with knowledge of frame size Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 01/15] xdp: add frame size to xdp_buff Jesper Dangaard Brouer
2020-03-17 20:42 ` Jakub Kicinski [this message]
2020-03-18 6:58 ` Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 02/15] mvneta: add XDP frame size to driver Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 03/15] bnxt: " Jesper Dangaard Brouer
2020-03-20 19:22 ` Andy Gospodarek
2020-03-23 14:18 ` Andy Gospodarek
2020-03-23 14:44 ` Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 04/15] ixgbe: fix XDP redirect on archs with PAGE_SIZE above 4K Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 05/15] ixgbe: add XDP frame size to driver Jesper Dangaard Brouer
2020-03-18 20:03 ` Maciej Fijalkowski
2020-03-18 21:23 ` Alexander Duyck
2020-03-20 21:44 ` Jesper Dangaard Brouer
2020-03-20 22:37 ` Alexander Duyck
2020-03-17 17:29 ` [PATCH RFC v1 06/15] sfc: fix XDP-redirect in this driver Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 07/15] sfc: add XDP frame size Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 08/15] xdp: allow bpf_xdp_adjust_tail() to grow packet size Jesper Dangaard Brouer
2020-03-17 17:29 ` [PATCH RFC v1 09/15] xdp: clear grow memory in bpf_xdp_adjust_tail() Jesper Dangaard Brouer
2020-03-17 20:38 ` Jakub Kicinski
2020-03-18 9:15 ` Toke Høiland-Jørgensen
2020-03-18 10:25 ` Jesper Dangaard Brouer
2020-03-19 5:35 ` Alexei Starovoitov
2020-03-17 17:29 ` [PATCH RFC v1 10/15] net: XDP-generic determining XDP frame size Jesper Dangaard Brouer
2020-03-17 17:30 ` [PATCH RFC v1 11/15] xdp: xdp_frame add member frame_sz and handle in convert_to_xdp_frame Jesper Dangaard Brouer
2020-03-17 17:30 ` [PATCH RFC v1 12/15] xdp: cpumap redirect use frame_sz and increase skb_tailroom Jesper Dangaard Brouer
2020-03-17 17:30 ` [PATCH RFC v1 13/15] tun: add XDP frame size Jesper Dangaard Brouer
2020-03-17 17:30 ` [PATCH RFC v1 14/15] veth: xdp using frame_sz in veth driver Jesper Dangaard Brouer
2020-03-17 17:30 ` [PATCH RFC v1 15/15] dpaa2-eth: add XDP frame size Jesper Dangaard Brouer
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