netdev - Re: [PATCH net-next RFC 0/2] add elevated refcnt support for page pool

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Date:   Wed, 7 Jul 2021 01:19:37 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Yunsheng Lin <linyunsheng@...wei.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, 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 net-next RFC 0/2] add elevated refcnt support for page pool

On Tue, Jul 6, 2021 at 5:51 PM Russell King (Oracle)
<linux@...linux.org.uk> wrote:
>
> On Fri, Jul 02, 2021 at 03:39:47PM +0200, Matteo Croce wrote:
> > On Wed, 30 Jun 2021 17:17:54 +0800
> > 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.
> > >
> > > Yunsheng Lin (2):
> > >   page_pool: add page recycling support based on elevated refcnt
> > >   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/hisilicon/hns3/hns3_ethtool.c |   1 +
> > >  drivers/net/ethernet/marvell/mvneta.c              |   6 +-
> > >  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c    |   2 +-
> > >  include/linux/mm_types.h                           |   2 +-
> > >  include/linux/skbuff.h                             |   4 +-
> > >  include/net/page_pool.h                            |  30 ++-
> > >  net/core/page_pool.c                               | 215
> > > +++++++++++++++++---- 9 files changed, 285 insertions(+), 57
> > > deletions(-)
> > >
> >
> > Interesting!
> > Unfortunately I'll not have access to my macchiatobin anytime soon, can
> > someone test the impact, if any, on mvpp2?
>
> I'll try to test. Please let me know what kind of testing you're
> looking for (I haven't been following these patches, sorry.)
>

A drop test or L2 routing will be enough.
BTW I should have the macchiatobin back on friday.

Regards,
-- 
per aspera ad upstream