From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: David Ahern <dsahern@gmail.com>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
Matteo Croce <mcroce@linux.microsoft.com>,
netdev@vger.kernel.org, linux-mm@kvack.org,
Ayush Sawal <ayush.sawal@chelsio.com>,
Vinay Kumar Yadav <vinay.yadav@chelsio.com>,
Rohit Maheshwari <rohitm@chelsio.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Marcin Wojtas <mw@semihalf.com>,
Russell King <linux@armlinux.org.uk>,
Mirko Lindner <mlindner@marvell.com>,
Stephen Hemminger <stephen@networkplumber.org>,
Tariq Toukan <tariqt@nvidia.com>,
Jesper Dangaard Brouer <hawk@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Boris Pismenny <borisp@nvidia.com>, Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
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Will Deacon <will@kernel.org>, Fenghua Yu <fenghua.yu@intel.com>,
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Peter Xu <peterx@redhat.com>, Jason Gunthorpe <jgg@ziepe.ca>,
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Alexander Lobakin <alobakin@pm.me>,
Cong Wang <cong.wang@bytedance.com>, wenxu <wenxu@ucloud.cn>,
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Jakub Sitnicki <jakub@cloudflare.com>,
Marco Elver <elver@google.com>,
Willem de Bruijn <willemb@google.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Guillaume Nault <gnault@redhat.com>,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
bpf@vger.kernel.org, Matthew Wilcox <willy@infradead.org>,
Eric Dumazet <edumazet@google.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>, Andrew Lunn <andrew@lunn.ch>,
Paolo Abeni <pabeni@redhat.com>,
Sven Auhagen <sven.auhagen@voleatech.de>
Subject: Re: [PATCH net-next v6 3/5] page_pool: Allow drivers to hint on SKB recycling
Date: Mon, 7 Jun 2021 07:35:58 +0300 [thread overview]
Message-ID: <YL2iLpEp826o81Bp@Iliass-MBP> (raw)
In-Reply-To: <722e5567-d8ee-228c-978e-9d5966257bb1@gmail.com>
Hi David,
On Sat, Jun 05, 2021 at 10:06:30AM -0600, David Ahern wrote:
> On 6/4/21 2:42 AM, Ilias Apalodimas wrote:
> > [...]
> >>> + /* Driver set this to memory recycling info. Reset it on recycle.
> >>> + * This will *not* work for NIC using a split-page memory model.
> >>> + * The page will be returned to the pool here regardless of the
> >>> + * 'flipped' fragment being in use or not.
> >>> + */
> >>
> >> I am not sure I understand how does the last part of comment related
> >> to the code below, as there is no driver using split-page memory model
> >> will reach here because those driver will not call skb_mark_for_recycle(),
> >> right?
> >>
> >
> > Yes the comment is there to prohibit people (mlx5 only actually) to add the
> > recycling bit on their driver. Because if they do it will *probably* work
> > but they might get random corrupted packets which will be hard to debug.
> >
>
> What's the complexity for getting it to work with split page model?
> Since 1500 is the default MTU, requiring a page per packet means a lot
> of wasted memory.
It boils down to 'can we re-use the page or is someone using it'.
Yunsheng sent a patch in earlier series that implements this with
ref counters. As Matteo mentions we can also add another page pool type.
In theory none of those sound too hard, but we'll have to code it and see.
/Ilias
next prev parent reply other threads:[~2021-06-07 4:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-21 16:15 [PATCH net-next v6 0/5] page_pool: recycle buffers Matteo Croce
2021-05-21 16:15 ` [PATCH net-next v6 1/5] mm: add a signature in struct page Matteo Croce
2021-05-21 16:15 ` [PATCH net-next v6 2/5] skbuff: add a parameter to __skb_frag_unref Matteo Croce
2021-05-21 16:15 ` [PATCH net-next v6 3/5] page_pool: Allow drivers to hint on SKB recycling Matteo Croce
2021-06-03 18:45 ` Matteo Croce
2021-06-04 7:52 ` Yunsheng Lin
2021-06-04 8:42 ` Ilias Apalodimas
2021-06-05 16:06 ` David Ahern
2021-06-05 16:34 ` Matteo Croce
2021-06-06 13:56 ` Tariq Toukan
2021-06-07 4:38 ` Ilias Apalodimas
2021-06-07 11:14 ` Tariq Toukan
2021-06-07 4:35 ` Ilias Apalodimas [this message]
2021-05-21 16:15 ` [PATCH net-next v6 4/5] mvpp2: recycle buffers Matteo Croce
2021-05-21 16:15 ` [PATCH net-next v6 5/5] mvneta: " Matteo Croce
2021-05-28 0:44 ` [PATCH net-next v6 0/5] page_pool: " Matteo Croce
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