netdev - Re: [PATCH net-next v3 03/13] net: page

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Date: Wed, 22 Nov 2023 09:55:34 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, pabeni@...hat.com, 
	almasrymina@...gle.com, hawk@...nel.org, ilias.apalodimas@...aro.org, 
	dsahern@...il.com, dtatulea@...dia.com, willemb@...gle.com
Subject: Re: [PATCH net-next v3 03/13] net: page_pool: record pools per netdev

On Wed, Nov 22, 2023 at 4:44 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Link the page pools with netdevs. This needs to be netns compatible
> so we have two options. Either we record the pools per netns and
> have to worry about moving them as the netdev gets moved.
> Or we record them directly on the netdev so they move with the netdev
> without any extra work.
>
> Implement the latter option. Since pools may outlast netdev we need
> a place to store orphans. In time honored tradition use loopback
> for this purpose.
>
> Reviewed-by: Mina Almasry <almasrymina@...gle.com>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> v1: fix race between page pool and netdev disappearing (Simon)
> ---
>  include/linux/list.h          | 20 ++++++++
>  include/linux/netdevice.h     |  4 ++
>  include/linux/poison.h        |  2 +
>  include/net/page_pool/types.h |  4 ++
>  net/core/page_pool_user.c     | 90 +++++++++++++++++++++++++++++++++++
>  5 files changed, 120 insertions(+)
>
> diff --git a/include/linux/list.h b/include/linux/list.h
> index 1837caedf723..059aa1fff41e 100644
> --- a/include/linux/list.h
> +++ b/include/linux/list.h
> @@ -1119,6 +1119,26 @@ static inline void hlist_move_list(struct hlist_head *old,
>         old->first = NULL;
>  }
>
>

> +static void page_pool_unreg_netdev(struct net_device *netdev)
> +{
> +       struct page_pool *pool, *last;
> +       struct net_device *lo;
> +
> +       lo = __dev_get_by_index(dev_net(netdev), 1);

Any reason for not using dev_net(netdev)->loopback_dev ?

> +       if (!lo) {
> +               netdev_err_once(netdev,
> +                               "can't get lo to store orphan page pools\n");
> +               page_pool_unreg_netdev_wipe(netdev);
> +               return;
> +       }
> +

Either way :

Reviewed-by: Eric Dumazet <edumazet@...gle.com>