linux-kernel - Re: [PATCH net-next 0/6] page

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Date:   Tue, 23 Mar 2021 15:41:23 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Matteo Croce <mcroce@...ux.microsoft.com>
Cc:     Alexander Lobakin <alobakin@...me>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Saeed Mahameed <saeedm@...dia.com>,
        David Ahern <dsahern@...il.com>,
        Saeed Mahameed <saeed@...nel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 0/6] page_pool: recycle buffers

From: Matteo Croce <mcroce@...ux.microsoft.com>
Date: Mon, 22 Mar 2021 18:02:55 +0100

> From: Matteo Croce <mcroce@...rosoft.com>
>
> This series enables recycling of the buffers allocated with the page_pool API.
> The first two patches are just prerequisite to save space in a struct and
> avoid recycling pages allocated with other API.
> Patch 2 was based on a previous idea from Jonathan Lemon.
>
> The third one is the real recycling, 4 fixes the compilation of __skb_frag_unref
> users, and 5,6 enable the recycling on two drivers.
>
> In the last two patches I reported the improvement I have with the series.
>
> The recycling as is can't be used with drivers like mlx5 which do page split,
> but this is documented in a comment.
> In the future, a refcount can be used so to support mlx5 with no changes.
>
> Ilias Apalodimas (2):
>   page_pool: DMA handling and allow to recycles frames via SKB
>   net: change users of __skb_frag_unref() and add an extra argument
>
> Jesper Dangaard Brouer (1):
>   xdp: reduce size of struct xdp_mem_info
>
> Matteo Croce (3):
>   mm: add a signature in struct page
>   mvpp2: recycle buffers
>   mvneta: recycle buffers
>
>  .../chelsio/inline_crypto/ch_ktls/chcr_ktls.c |  2 +-
>  drivers/net/ethernet/marvell/mvneta.c         |  4 +-
>  .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 17 +++----
>  drivers/net/ethernet/marvell/sky2.c           |  2 +-
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c    |  2 +-
>  include/linux/mm_types.h                      |  1 +
>  include/linux/skbuff.h                        | 33 +++++++++++--
>  include/net/page_pool.h                       | 15 ++++++
>  include/net/xdp.h                             |  5 +-
>  net/core/page_pool.c                          | 47 +++++++++++++++++++
>  net/core/skbuff.c                             | 20 +++++++-
>  net/core/xdp.c                                | 14 ++++--
>  net/tls/tls_device.c                          |  2 +-
>  13 files changed, 138 insertions(+), 26 deletions(-)

Just for the reference, I've performed some tests on 1G SoC NIC with
this patchset on, here's direct link: [0]

> --
> 2.30.2

[0] https://lore.kernel.org/netdev/20210323153550.130385-1-alobakin@pm.me

Thanks,
Al