linux-kernel - Re: [PATCH rfc v2 0/5] add elevated refcnt support for page pool

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Message-ID: <CAFnufp3RXwrJy24r50dHG6ouM2tsGY3JgPq9h1B5C0TOYCDHrQ@mail.gmail.com>
Date:   Sat, 10 Jul 2021 17:40:53 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, alexander.duyck@...il.com,
        Russell King <linux@...linux.org.uk>,
        Marcin Wojtas <mw@...ihalf.com>, linuxarm@...neuler.org,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Roman Gushchin <guro@...com>, Peter Xu <peterx@...hat.com>,
        feng.tang@...el.com, Jason Gunthorpe <jgg@...pe.ca>,
        Matteo Croce <mcroce@...rosoft.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexander Lobakin <alobakin@...me>,
        Willem de Bruijn <willemb@...gle.com>,
        wenxu <wenxu@...oud.cn>, Cong Wang <cong.wang@...edance.com>,
        Kevin Hao <haokexin@...il.com>,
        Aleksandr Nogikh <nogikh@...gle.com>,
        Marco Elver <elver@...gle.com>, netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bpf@...r.kernel.org
Subject: Re: [PATCH rfc v2 0/5] add elevated refcnt support for page pool

On Sat, Jul 10, 2021 at 9:44 AM Yunsheng Lin <linyunsheng@...wei.com> wrote:
>
> This patchset adds elevated refcnt support for page pool
> and enable skb's page frag recycling based on page pool
> in hns3 drvier.
>
> RFC v2:
> 1. Split patch 1 to more reviewable one.
> 2. Repurpose the lower 12 bits of the dma address to store the
>    pagecnt_bias as suggested by Alexander.
> 3. support recycling to pool->alloc for elevated refcnt case
>    too.
>
> Yunsheng Lin (5):
>   page_pool: keep pp info as long as page pool owns the page
>   page_pool: add interface for getting and setting pagecnt_bias
>   page_pool: add page recycling support based on elevated refcnt
>   page_pool: support page frag API for page pool
>   net: hns3: support skb's frag page recycling based on page pool
>
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |  79 ++++++++++-
>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.h |   3 +
>  drivers/net/ethernet/marvell/mvneta.c           |   6 +-
>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c |   2 +-
>  drivers/net/ethernet/ti/cpsw.c                  |   2 +-
>  drivers/net/ethernet/ti/cpsw_new.c              |   2 +-
>  include/linux/skbuff.h                          |   4 +-
>  include/net/page_pool.h                         |  50 +++++--
>  net/core/page_pool.c                            | 172 ++++++++++++++++++++----
>  9 files changed, 266 insertions(+), 54 deletions(-)
>
> --
> 2.7.4
>

For mvpp2:

Tested-by: Matteo Croce <mcroce@...rosoft.com>

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