netdev - Re: [PATCH net-next v3 08/18] page_pool: make page_pool_put_page

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Message-ID: <87o72z9nij.fsf@toke.dk>
Date: Fri, 01 Nov 2024 12:55:32 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>, Alexei Starovoitov
 <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, John Fastabend
 <john.fastabend@...il.com>, Andrii Nakryiko <andrii@...nel.org>, Maciej
 Fijalkowski <maciej.fijalkowski@...el.com>, Stanislav Fomichev
 <sdf@...ichev.me>, Magnus Karlsson <magnus.karlsson@...el.com>,
 nex.sw.ncis.osdt.itp.upstreaming@...el.com, bpf@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 08/18] page_pool: make
 page_pool_put_page_bulk() actually handle array of pages

Alexander Lobakin <aleksander.lobakin@...el.com> writes:

> Currently, page_pool_put_page_bulk() indeed takes an array of pointers
> to the data, not pages, despite the name. As one side effect, when
> you're freeing frags from &skb_shared_info, xdp_return_frame_bulk()
> converts page pointers to virtual addresses and then
> page_pool_put_page_bulk() converts them back.
> Make page_pool_put_page_bulk() actually handle array of pages. Pass
> frags directly and use virt_to_page() when freeing xdpf->data, so that
> the PP core will then get the compound head and take care of the rest.
>
> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>

Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>