netdev - Re: [PATCH net-next 0/3] Change BPF_TEST_RUN use the system page pool for live XDP frames

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Message-ID: <87h6i8cxvc.fsf@toke.dk>
Date: Fri, 16 Feb 2024 15:00:39 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann
 <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Martin KaFai
 Lau <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>, Song Liu
 <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, John Fastabend
 <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>, Stanislav
 Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, Jiri Olsa
 <jolsa@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>,
 netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next 0/3] Change BPF_TEST_RUN use the system page
 pool for live XDP frames

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

> From: Toke Høiland-Jørgensen <toke@...hat.com>
> Date: Thu, 15 Feb 2024 18:06:42 +0100
>
>> Alexander Lobakin <aleksander.lobakin@...el.com> writes:
>> 
>>> From: Toke Høiland-Jørgensen <toke@...hat.com>
>>> Date: Thu, 15 Feb 2024 14:26:29 +0100
>>>
>>>> Now that we have a system-wide page pool, we can use that for the live
>>>> frame mode of BPF_TEST_RUN (used by the XDP traffic generator), and
>>>> avoid the cost of creating a separate page pool instance for each
>>>> syscall invocation. See the individual patches for more details.
>>>
>>> Tested xdp-trafficgen on my development tree[0], no regressions from the
>>> net-next with my patch which increases live frames PP size.
>>>
>>> Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
>>> Tested-by: Alexander Lobakin <aleksander.lobakin@...el.com>
>> 
>> Great, thanks for taking it for a spin! :)
>
> BTW, you remove the usage of page_pool->slow.init_callback, maybe we
> could remove it completely?

Ohh, you're right. Totally forgot that this was something I introduced
for this use case :D

I'll send a follow-up to get rid of it after this lands.

-Toke