From: Shay Agroskin <shayagr@amazon.com>
To: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
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>,
Vlastimil Babka <vbabka@suse.cz>, Yu Zhao <yuzhao@google.com>,
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Guoqing Jiang <guoqing.jiang@cloud.ionos.com>,
"Jonathan Lemon" <jonathan.lemon@gmail.com>,
Alexander Lobakin <alobakin@pm.me>,
"Cong Wang" <cong.wang@bytedance.com>, wenxu <wenxu@ucloud.cn>,
Kevin Hao <haokexin@gmail.com>,
Aleksandr Nogikh <nogikh@google.com>,
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>,
David Ahern <dsahern@gmail.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>, Andrew Lunn <andrew@lunn.ch>,
Paolo Abeni <pabeni@redhat.com>
Subject: Re: [PATCH net-next v3 0/5] page_pool: recycle buffers
Date: Sun, 9 May 2021 08:11:35 +0300 [thread overview]
Message-ID: <pj41zl4kfclce0.fsf@u570694869fb251.ant.amazon.com> (raw)
In-Reply-To: <20210507121953.59e22aa8@carbon>
Jesper Dangaard Brouer <brouer@redhat.com> writes:
> On Fri, 7 May 2021 16:28:30 +0800
> Yunsheng Lin <linyunsheng@huawei.com> wrote:
>
>> On 2021/5/7 15:06, Ilias Apalodimas wrote:
>> > On Fri, May 07, 2021 at 11:23:28AM +0800, Yunsheng Lin wrote:
>> >> On 2021/5/6 20:58, Ilias Apalodimas wrote:
>> >>>>>>
>> >>>>>
> ...
>> >
>> >
>> > I think both choices are sane. What I am trying to explain
>> > here, is
>> > regardless of what we choose now, we can change it in the
>> > future without
>> > affecting the API consumers at all. What will change
>> > internally is the way we
>> > lookup the page pool pointer we are trying to recycle.
>>
>> It seems the below API need changing?
>> +static inline void skb_mark_for_recycle(struct sk_buff *skb,
>> struct page *page,
>> + struct xdp_mem_info *mem)
>
> I don't think we need to change this API, to support future
> memory
> models. Notice that xdp_mem_info have a 'type' member.
Hi,
Providing that we will (possibly as a future optimization) store
the pointer to the page pool in struct page instead of strcut
xdp_mem_info, passing
xdp_mem_info * instead of struct page_pool * would mean that for
every packet we'll need to call
xa = rhashtable_lookup(mem_id_ht, &mem->id,
mem_id_rht_params);
xa->page_pool;
which might pressure the Dcache to fetch a pointer that might be
present already in cache as part of driver's data-structures.
I tend to agree with Yunsheng that it makes more sense to adjust
the API for the clear use-case now rather than using xdp_mem_info
indirection. It seems to me like
the page signature provides the same information anyway and allows
to support different memory types.
Shay
>
> Naming in Computer Science is a hard problem ;-). Something that
> seems
> to confuse a lot of people is the naming of the struct
> "xdp_mem_info".
> Maybe we should have named it "mem_info" instead or
> "net_mem_info", as
> it doesn't indicate that the device is running XDP.
>
> I see XDP as the RX-layer before the network stack, that helps
> drivers
> to support different memory models, also for handling normal
> packets
> that doesn't get process by XDP, and the drivers doesn't even
> need to
> support XDP to use the "xdp_mem_info" type.
next prev parent reply other threads:[~2021-05-09 5:12 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 22:37 [PATCH net-next v3 0/5] page_pool: recycle buffers Matteo Croce
2021-04-09 22:37 ` [PATCH net-next v3 1/5] xdp: reduce size of struct xdp_mem_info Matteo Croce
2021-04-09 22:37 ` [PATCH net-next v3 2/5] mm: add a signature in struct page Matteo Croce
2021-04-10 15:48 ` Matthew Wilcox
2021-04-10 16:16 ` Ilias Apalodimas
2021-04-10 17:42 ` Shakeel Butt
2021-04-10 18:27 ` Ilias Apalodimas
2021-04-10 19:39 ` Matthew Wilcox
2021-04-11 10:05 ` Jesper Dangaard Brouer
2021-04-14 19:41 ` Jesper Dangaard Brouer
2021-04-14 20:09 ` Shakeel Butt
2021-04-14 20:51 ` Eric Dumazet
2021-04-19 5:12 ` Ilias Apalodimas
2021-04-19 14:57 ` Shakeel Butt
2021-04-19 15:43 ` Ilias Apalodimas
2021-04-19 16:21 ` Shakeel Butt
2021-04-19 18:41 ` Ilias Apalodimas
2021-04-19 11:22 ` Jesper Dangaard Brouer
2021-04-19 13:01 ` Matthew Wilcox
2021-04-20 8:10 ` Ilias Apalodimas
2021-04-09 22:37 ` [PATCH net-next v3 3/5] page_pool: Allow drivers to hint on SKB recycling Matteo Croce
2021-04-10 0:11 ` Ilias Apalodimas
2021-04-10 0:39 ` Matteo Croce
2021-04-09 22:38 ` [PATCH net-next v3 4/5] mvpp2: recycle buffers Matteo Croce
2021-04-09 22:38 ` [PATCH net-next v3 5/5] mvneta: " Matteo Croce
2021-04-29 8:27 ` [PATCH net-next v3 0/5] page_pool: " Yunsheng Lin
2021-04-29 18:51 ` Ilias Apalodimas
2021-04-30 3:01 ` Yunsheng Lin
2021-04-30 16:24 ` Ilias Apalodimas
2021-04-30 17:32 ` Ilias Apalodimas
2021-05-03 7:29 ` Jesper Dangaard Brouer
2021-05-06 12:34 ` Yunsheng Lin
2021-05-06 12:58 ` Ilias Apalodimas
2021-05-07 3:23 ` Yunsheng Lin
2021-05-07 7:06 ` Ilias Apalodimas
2021-05-07 8:28 ` Yunsheng Lin
2021-05-07 10:19 ` Jesper Dangaard Brouer
2021-05-07 11:31 ` Christoph Hellwig
2021-05-09 5:11 ` Shay Agroskin [this message]
2021-05-11 8:41 ` Ilias Apalodimas
2021-05-10 2:20 ` Yunsheng Lin
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