netdev - Re: [PATCH v5 bpf-next 02/14] xdp: initialize xdp

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Date:   Mon, 7 Dec 2020 13:15:00 -0800
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf <bpf@...r.kernel.org>, Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, shayagr@...zon.com,
        "Jubran, Samih" <sameehj@...zon.com>,
        John Fastabend <john.fastabend@...il.com>, dsahern@...nel.org,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        lorenzo.bianconi@...hat.com, Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH v5 bpf-next 02/14] xdp: initialize xdp_buff mb bit to 0 in
 all XDP drivers

On Mon, Dec 7, 2020 at 8:36 AM Lorenzo Bianconi <lorenzo@...nel.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@...nel.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(+)
>