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From: Alexander Duyck <alexander.duyck@gmail.com>
To: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: bpf <bpf@vger.kernel.org>, Netdev <netdev@vger.kernel.org>,
	David Miller <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	shayagr@amazon.com, "Jubran, Samih" <sameehj@amazon.com>,
	John Fastabend <john.fastabend@gmail.com>,
	dsahern@kernel.org, Jesper Dangaard Brouer <brouer@redhat.com>,
	Eelco Chaudron <echaudro@redhat.com>,
	lorenzo.bianconi@redhat.com, Jason Wang <jasowang@redhat.com>
Subject: Re: [PATCH v5 bpf-next 02/14] xdp: initialize xdp_buff mb bit to 0 in all XDP drivers
Date: Mon, 7 Dec 2020 13:15:00 -0800	[thread overview]
Message-ID: <CAKgT0UcjtERgpV9tke-HcmP7rWOns_-jmthnGiNPES+aqhScFg@mail.gmail.com> (raw)
In-Reply-To: <693d48b46dd5172763952acd94358cc5d02dcda3.1607349924.git.lorenzo@kernel.org>

On Mon, Dec 7, 2020 at 8:36 AM Lorenzo Bianconi <lorenzo@kernel.org> wrote:
>
> Initialize multi-buffer bit (mb) to 0 in all XDP-capable drivers.
> This is a preliminary patch to enable xdp multi-buffer support.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

I'm really not a fan of this design. Having to update every driver in
order to initialize a field that was fragmented is a pain. At a
minimum it seems like it might be time to consider introducing some
sort of initializer function for this so that you can update things in
one central place the next time you have to add a new field instead of
having to update every individual driver that supports XDP. Otherwise
this isn't going to scale going forward.

> ---
>  drivers/net/ethernet/amazon/ena/ena_netdev.c        | 1 +
>  drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c       | 1 +
>  drivers/net/ethernet/cavium/thunder/nicvf_main.c    | 1 +
>  drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c    | 1 +
>  drivers/net/ethernet/intel/i40e/i40e_txrx.c         | 1 +
>  drivers/net/ethernet/intel/ice/ice_txrx.c           | 1 +
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c       | 1 +
>  drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c   | 1 +
>  drivers/net/ethernet/marvell/mvneta.c               | 1 +
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c     | 1 +
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c          | 1 +
>  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c     | 1 +
>  drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 1 +
>  drivers/net/ethernet/qlogic/qede/qede_fp.c          | 1 +
>  drivers/net/ethernet/sfc/rx.c                       | 1 +
>  drivers/net/ethernet/socionext/netsec.c             | 1 +
>  drivers/net/ethernet/ti/cpsw.c                      | 1 +
>  drivers/net/ethernet/ti/cpsw_new.c                  | 1 +
>  drivers/net/hyperv/netvsc_bpf.c                     | 1 +
>  drivers/net/tun.c                                   | 2 ++
>  drivers/net/veth.c                                  | 1 +
>  drivers/net/virtio_net.c                            | 2 ++
>  drivers/net/xen-netfront.c                          | 1 +
>  net/core/dev.c                                      | 1 +
>  24 files changed, 26 insertions(+)
>

  reply	other threads:[~2020-12-07 21:16 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-07 16:32 [PATCH v5 bpf-next 00/14] mvneta: introduce XDP multi-buffer support Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 01/14] xdp: introduce mb in xdp_buff/xdp_frame Lorenzo Bianconi
2020-12-07 21:16   ` Alexander Duyck
2020-12-07 23:03     ` Saeed Mahameed
2020-12-08  3:16       ` Alexander Duyck
2020-12-08  6:49         ` Saeed Mahameed
2020-12-08  9:47           ` Jesper Dangaard Brouer
2020-12-07 16:32 ` [PATCH v5 bpf-next 02/14] xdp: initialize xdp_buff mb bit to 0 in all XDP drivers Lorenzo Bianconi
2020-12-07 21:15   ` Alexander Duyck [this message]
2020-12-07 21:37     ` Maciej Fijalkowski
2020-12-07 23:20       ` Saeed Mahameed
2020-12-08 10:31         ` Lorenzo Bianconi
2020-12-08 13:29           ` Jesper Dangaard Brouer
2020-12-07 16:32 ` [PATCH v5 bpf-next 03/14] xdp: add xdp_shared_info data structure Lorenzo Bianconi
2020-12-08  0:22   ` Saeed Mahameed
2020-12-08 11:01     ` Lorenzo Bianconi
2020-12-19 14:53       ` Shay Agroskin
2020-12-19 15:30         ` Jamal Hadi Salim
2020-12-21  9:01           ` Jesper Dangaard Brouer
2020-12-21 13:00             ` Jamal Hadi Salim
2020-12-20 17:52         ` Lorenzo Bianconi
2020-12-21 20:55           ` Shay Agroskin
2020-12-07 16:32 ` [PATCH v5 bpf-next 04/14] net: mvneta: update mb bit before passing the xdp buffer to eBPF layer Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 05/14] xdp: add multi-buff support to xdp_return_{buff/frame} Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 06/14] net: mvneta: add multi buffer support to XDP_TX Lorenzo Bianconi
2020-12-19 15:56   ` Shay Agroskin
2020-12-20 18:06     ` Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 07/14] bpf: move user_size out of bpf_test_init Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 08/14] bpf: introduce multibuff support to bpf_prog_test_run_xdp() Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 09/14] bpf: test_run: add xdp_shared_info pointer in bpf_test_finish signature Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 10/14] net: mvneta: enable jumbo frames for XDP Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 11/14] bpf: cpumap: introduce xdp multi-buff support Lorenzo Bianconi
2020-12-19 17:46   ` Shay Agroskin
2020-12-20 17:56     ` Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 12/14] bpf: add multi-buff support to the bpf_xdp_adjust_tail() API Lorenzo Bianconi
2020-12-07 16:32 ` [PATCH v5 bpf-next 13/14] bpf: add new frame_length field to the XDP ctx Lorenzo Bianconi
2020-12-08 22:17   ` Maciej Fijalkowski
2020-12-09 10:35     ` Eelco Chaudron
2020-12-09 11:10       ` Maciej Fijalkowski
2020-12-09 12:07         ` Eelco Chaudron
2020-12-15 13:28           ` Eelco Chaudron
2020-12-15 18:06             ` Maciej Fijalkowski
2020-12-16 14:08               ` Eelco Chaudron
2021-01-15 16:36                 ` Eelco Chaudron
2021-01-18 16:48                   ` Maciej Fijalkowski
2021-01-20 13:20                     ` Eelco Chaudron
2021-02-01 16:00                       ` Eelco Chaudron
2020-12-07 16:32 ` [PATCH v5 bpf-next 14/14] bpf: update xdp_adjust_tail selftest to include multi-buffer Lorenzo Bianconi

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