netdev - Re: [PATCH net-next 04/15] net: page

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Date: Thu, 9 Nov 2023 11:21:32 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com, 
	pabeni@...hat.com, almasrymina@...gle.com, hawk@...nel.org
Subject: Re: [PATCH net-next 04/15] net: page_pool: id the page pools

On Tue, 24 Oct 2023 at 19:02, Jakub Kicinski <kuba@...nel.org> wrote:
>
> To give ourselves the flexibility of creating netlink commands
> and ability to refer to page pool instances in uAPIs create
> IDs for page pools.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>  include/net/page_pool/types.h |  4 ++++
>  net/core/Makefile             |  2 +-
>  net/core/page_pool.c          | 21 +++++++++++++++-----
>  net/core/page_pool_priv.h     |  9 +++++++++
>  net/core/page_pool_user.c     | 36 +++++++++++++++++++++++++++++++++++
>  5 files changed, 66 insertions(+), 6 deletions(-)
>  create mode 100644 net/core/page_pool_priv.h
>  create mode 100644 net/core/page_pool_user.c
>

[...]

> +int page_pool_list(struct page_pool *pool)
> +{
> +       static u32 id_alloc_next;
> +       int err;
> +
> +       mutex_lock(&page_pools_lock);
> +       err = xa_alloc_cyclic(&page_pools, &pool->user.id, pool, xa_limit_32b,
> +                             &id_alloc_next, GFP_KERNEL);
> +       if (err < 0)
> +               goto err_unlock;

A nit really, but get rid of the if/goto and just let this return err; ?

> +
> +       mutex_unlock(&page_pools_lock);
> +       return 0;
> +
> +err_unlock:
> +       mutex_unlock(&page_pools_lock);
> +       return err;
> +}
> +
> +void page_pool_unlist(struct page_pool *pool)
> +{
> +       mutex_lock(&page_pools_lock);
> +       xa_erase(&page_pools, pool->user.id);
> +       mutex_unlock(&page_pools_lock);
> +}
> --
> 2.41.0
>