From: Saeed Mahameed <saeedm@mellanox.com>
To: "brouer@redhat.com" <brouer@redhat.com>,
"sameehj@amazon.com" <sameehj@amazon.com>
Cc: "toke@redhat.com" <toke@redhat.com>,
"gtzalik@amazon.com" <gtzalik@amazon.com>,
"ilias.apalodimas@linaro.org" <ilias.apalodimas@linaro.org>,
"borkmann@iogearbox.net" <borkmann@iogearbox.net>,
"alexander.duyck@gmail.com" <alexander.duyck@gmail.com>,
"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
"akiyano@amazon.com" <akiyano@amazon.com>,
"zorik@amazon.com" <zorik@amazon.com>,
"alexei.starovoitov@gmail.com" <alexei.starovoitov@gmail.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"jeffrey.t.kirsher@intel.com" <jeffrey.t.kirsher@intel.com>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"dsahern@gmail.com" <dsahern@gmail.com>,
"lorenzo@kernel.org" <lorenzo@kernel.org>,
"willemdebruijn.kernel@gmail.com"
<willemdebruijn.kernel@gmail.com>
Subject: Re: [PATCH RFC v2 01/33] xdp: add frame size to xdp_buff
Date: Thu, 9 Apr 2020 00:50:02 +0000 [thread overview]
Message-ID: <7fb99df47a9eae1fd0fc8dc85336f7df2c120744.camel@mellanox.com> (raw)
In-Reply-To: <158634663936.707275.3156718045905620430.stgit@firesoul>
On Wed, 2020-04-08 at 13:50 +0200, 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.
>
> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
> ---
> include/net/xdp.h | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/include/net/xdp.h b/include/net/xdp.h
> index 40c6d3398458..99f4374f6214 100644
> --- a/include/net/xdp.h
> +++ b/include/net/xdp.h
> @@ -6,6 +6,8 @@
> #ifndef __LINUX_NET_XDP_H__
> #define __LINUX_NET_XDP_H__
>
> +#include <linux/skbuff.h> /* skb_shared_info */
> +
I think it is wrong to make xdp.h depend on skbuff.h
we must keep xdp.h minimal and independent,
the new macros should be defined in skbuff.h
> /**
> * DOC: XDP RX-queue information
> *
> @@ -70,8 +72,23 @@ struct xdp_buff {
> void *data_hard_start;
> unsigned long handle;
> struct xdp_rxq_info *rxq;
> + u32 frame_sz; /* frame size to deduct data_hard_end/reserved
> tailroom*/
why u32 ? u16 should be more than enough..
> };
>
> +/* Reserve memory area at end-of data area.
> + *
> + * This macro reserves tailroom in the XDP buffer by limiting the
> + * XDP/BPF data access to data_hard_end. Notice same area (and
> size)
> + * is used for XDP_PASS, when constructing the SKB via build_skb().
> + */
> +#define xdp_data_hard_end(xdp) \
> + ((xdp)->data_hard_start + (xdp)->frame_sz - \
> + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
> +
this macro is not safe when unary operators are being used
> +/* Like skb_shinfo */
> +#define xdp_shinfo(xdp) ((struct skb_shared_info
> *)(xdp_data_hard_end(xdp)))
> +// XXX: Above likely belongs in later patch
> +
> struct xdp_frame {
> void *data;
> u16 len;
>
>
next prev parent reply other threads:[~2020-04-09 0:50 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <158634658714.707275.7903484085370879864.stgit@firesoul>
2020-04-08 11:50 ` [PATCH RFC v2 01/33] xdp: add frame size to xdp_buff Jesper Dangaard Brouer
2020-04-08 17:53 ` Jakub Kicinski
2020-04-09 0:48 ` Saeed Mahameed
2020-04-09 1:13 ` Jakub Kicinski
2020-04-09 23:07 ` Saeed Mahameed
2020-04-09 23:27 ` Jakub Kicinski
2020-04-14 14:16 ` Jesper Dangaard Brouer
2020-04-09 0:50 ` Saeed Mahameed [this message]
2020-04-16 13:02 ` Jesper Dangaard Brouer
2020-04-17 23:09 ` Saeed Mahameed
2020-04-08 11:50 ` [PATCH RFC v2 02/33] bnxt: add XDP frame size to driver Jesper Dangaard Brouer
2020-04-08 11:50 ` [PATCH RFC v2 03/33] sfc: add XDP frame size Jesper Dangaard Brouer
2020-04-08 11:50 ` [PATCH RFC v2 04/33] mvneta: add XDP frame size to driver Jesper Dangaard Brouer
2020-04-08 11:50 ` [PATCH RFC v2 05/33] net: netsec: Add support for XDP frame size Jesper Dangaard Brouer
2020-04-08 13:09 ` Lorenzo Bianconi
2020-04-14 8:07 ` Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 06/33] net: XDP-generic determining " Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 07/33] xdp: xdp_frame add member frame_sz and handle in convert_to_xdp_frame Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 08/33] xdp: cpumap redirect use frame_sz and increase skb_tailroom Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 09/33] veth: adjust hard_start offset on redirect XDP frames Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 10/33] veth: xdp using frame_sz in veth driver Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 11/33] dpaa2-eth: add XDP frame size Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 12/33] hv_netvsc: add XDP frame size to driver Jesper Dangaard Brouer
2020-04-08 14:56 ` Haiyang Zhang
2020-04-08 11:51 ` [PATCH RFC v2 13/33] qlogic/qede: " Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 14/33] net: ethernet: ti: add XDP frame size to driver cpsw Jesper Dangaard Brouer
2020-04-08 11:51 ` [PATCH RFC v2 15/33] ena: add XDP frame size to amazon NIC driver Jesper Dangaard Brouer
2020-04-22 8:39 ` Jubran, Samih
2020-04-08 11:51 ` [PATCH RFC v2 16/33] mlx4: add XDP frame size and adjust max XDP MTU Jesper Dangaard Brouer
2020-04-08 12:57 ` Tariq Toukan
2020-04-14 8:19 ` Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 17/33] mlx5: rx queue setup time determine frame_sz for XDP Jesper Dangaard Brouer
2020-04-08 12:52 ` Tariq Toukan
2020-04-16 12:04 ` Jesper Dangaard Brouer
2020-04-09 9:28 ` Maxim Mikityanskiy
2020-04-08 11:52 ` [PATCH RFC v2 18/33] net: thunderx: add XDP frame size Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 19/33] nfp: add XDP frame size to netronome driver Jesper Dangaard Brouer
2020-04-08 17:53 ` Jakub Kicinski
2020-04-14 14:02 ` Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 20/33] tun: add XDP frame size Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 21/33] vhost_net: also populate " Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 22/33] virtio_net: add XDP frame size in two code paths Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 23/33] ixgbe: fix XDP redirect on archs with PAGE_SIZE above 4K Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 24/33] ixgbe: add XDP frame size to driver Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 25/33] ixgbevf: add XDP frame size to VF driver Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 26/33] i40e: add XDP frame size to driver Jesper Dangaard Brouer
2020-04-08 21:48 ` David Miller
2020-04-14 10:16 ` Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 27/33] ice: " Jesper Dangaard Brouer
2020-04-08 11:52 ` [PATCH RFC v2 28/33] xdp: for Intel AF_XDP drivers add XDP frame_sz Jesper Dangaard Brouer
2020-04-08 17:31 ` Björn Töpel
2020-04-09 9:33 ` Maxim Mikityanskiy
2020-04-08 11:53 ` [PATCH RFC v2 29/33] xdp: allow bpf_xdp_adjust_tail() to grow packet size Jesper Dangaard Brouer
2020-04-09 3:31 ` Saeed Mahameed
2020-04-14 12:46 ` Jesper Dangaard Brouer
2020-04-18 3:33 ` Saeed Mahameed
2020-04-14 9:56 ` Jesper Dangaard Brouer
2020-04-14 10:11 ` Toke Høiland-Jørgensen
2020-04-08 11:53 ` [PATCH RFC v2 30/33] xdp: clear grow memory in bpf_xdp_adjust_tail() Jesper Dangaard Brouer
2020-04-08 21:49 ` David Miller
2020-04-14 9:43 ` Jesper Dangaard Brouer
2020-04-08 11:53 ` [PATCH RFC v2 31/33] bpf: add xdp.frame_sz in bpf_prog_test_run_xdp() Jesper Dangaard Brouer
2020-04-08 11:53 ` [PATCH RFC v2 32/33] selftests/bpf: adjust BPF selftest for xdp_adjust_tail Jesper Dangaard Brouer
2020-04-08 11:53 ` [PATCH RFC v2 33/33] selftests/bpf: xdp_adjust_tail add grow tail tests Jesper Dangaard Brouer
2020-04-08 16:55 ` [PATCH RFC v2 00/33] XDP extend with knowledge of frame size Alexei Starovoitov
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