linux-kernel - Re: [RFC PATCH net-next 00/11] NXP ENETC AF

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Date:   Wed, 8 Feb 2023 17:41:59 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
CC:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH net-next 00/11] NXP ENETC AF_XDP zero-copy sockets

On Mon, Feb 06, 2023 at 12:08:26PM +0200, Vladimir Oltean wrote:
> This is RFC because I have a few things I'm not 100% certain about.
> I've tested this with the xdpsock test application, I don't have very
> detailed knowledge about the internals of AF_XDP sockets.
> 
> Patches where I'd appreciate if people took a look are 02/11, 05/11,
> 10/11 and 11/11.

All of that looks rather sane to me. Can you point out explicitly your
issues here? Is it around concurrent access to XDP Tx rings or something
more?

I commented on 10 and 11. For 2 it seems fine and 5 has always been
controversial.

> 
> Vladimir Oltean (11):
>   net: enetc: optimize struct enetc_rx_swbd layout
>   net: enetc: perform XDP RX queue registration at enetc_setup_bpf()
>     time
>   net: enetc: rename "cleaned_cnt" to "buffs_missing"
>   net: enetc: continue NAPI processing on frames with RX errors
>   net: enetc: add support for ethtool --show-channels
>   net: enetc: consolidate rx_swbd freeing
>   net: enetc: rename enetc_free_tx_frame() to enetc_free_tx_swbd()
>   net: enetc: increment rx_byte_cnt for XDP data path
>   net: enetc: move setting of ENETC_TXBD_FLAGS_F flag to
>     enetc_xdp_map_tx_buff()
>   net: enetc: add RX support for zero-copy XDP sockets
>   net: enetc: add TX support for zero-copy XDP sockets
> 
>  drivers/net/ethernet/freescale/enetc/enetc.c  | 676 +++++++++++++++---
>  drivers/net/ethernet/freescale/enetc/enetc.h  |   9 +-
>  .../ethernet/freescale/enetc/enetc_ethtool.c  |  10 +
>  .../net/ethernet/freescale/enetc/enetc_pf.c   |   1 +
>  4 files changed, 606 insertions(+), 90 deletions(-)
> 
> -- 
> 2.34.1
>