netdev - Re: [PATCH v5 net-next 1/3] net: introduce page_pool pointer in softnet

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Date: Tue, 19 Dec 2023 17:29:06 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: netdev@...r.kernel.org, lorenzo.bianconi@...hat.com, davem@...emloft.net, 
	kuba@...nel.org, pabeni@...hat.com, bpf@...r.kernel.org, hawk@...nel.org, 
	toke@...hat.com, willemdebruijn.kernel@...il.com, jasowang@...hat.com, 
	sdf@...gle.com
Subject: Re: [PATCH v5 net-next 1/3] net: introduce page_pool pointer in
 softnet_data percpu struct

On Thu, Dec 14, 2023 at 3:30 PM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
>
> Allocate percpu page_pools in softnet_data.
> Moreover add cpuid filed in page_pool struct in order to recycle the
> page in the page_pool "hot" cache if napi_pp_put_page() is running on
> the same cpu.
> This is a preliminary patch to add xdp multi-buff support for xdp running
> in generic mode.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  include/linux/netdevice.h       |  1 +
>  include/net/page_pool/helpers.h |  5 +++++
>  include/net/page_pool/types.h   |  1 +
>  net/core/dev.c                  | 39 ++++++++++++++++++++++++++++++++-
>  net/core/page_pool.c            |  5 +++++
>  net/core/skbuff.c               |  5 +++--
>  6 files changed, 53 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 1b935ee341b4..30b6a3f601fe 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -3319,6 +3319,7 @@ struct softnet_data {
>         int                     defer_count;
>         int                     defer_ipi_scheduled;
>         struct sk_buff          *defer_list;
> +       struct page_pool        *page_pool;
>         call_single_data_t      defer_csd;
>  };

This field should be put elsewhere, not in this contended cache line.