netdev - Re: [PATCH net-next v3 08/15] xsk: Add small helper xp_pool

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Message-ID: <330d315e-53c0-453e-9b5d-a432c2bbf7d5@blackwall.org>
Date: Wed, 22 Oct 2025 15:52:31 +0300
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Cc: bpf@...r.kernel.org, kuba@...nel.org, davem@...emloft.net,
 pabeni@...hat.com, willemb@...gle.com, sdf@...ichev.me,
 john.fastabend@...il.com, martin.lau@...nel.org, jordan@...fe.io,
 maciej.fijalkowski@...el.com, magnus.karlsson@...el.com, dw@...idwei.uk,
 toke@...hat.com, yangzhenze@...edance.com, wangdongdong.6@...edance.com
Subject: Re: [PATCH net-next v3 08/15] xsk: Add small helper xp_pool_bindable

On 10/20/25 19:23, Daniel Borkmann wrote:
> Add another small helper called xp_pool_bindable and move the current
> dev_get_min_mp_channel_count test into this helper. Pass in the pool
> object, such that we derive the netdev from the prior registered pool.
> 
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> Co-developed-by: David Wei <dw@...idwei.uk>
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
>  net/xdp/xsk_buff_pool.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
> index 62a176996f02..701be6a5b074 100644
> --- a/net/xdp/xsk_buff_pool.c
> +++ b/net/xdp/xsk_buff_pool.c
> @@ -54,6 +54,11 @@ int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs)
>  	return 0;
>  }
>  
> +static bool xp_pool_bindable(struct xsk_buff_pool *pool)
> +{
> +	return dev_get_min_mp_channel_count(pool->netdev) == 0;
> +}
> +
>  struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
>  						struct xdp_umem *umem)
>  {
> @@ -204,7 +209,7 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
>  		goto err_unreg_pool;
>  	}
>  
> -	if (dev_get_min_mp_channel_count(netdev)) {
> +	if (!xp_pool_bindable(pool)) {
>  		err = -EBUSY;
>  		goto err_unreg_pool;
>  	}

Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>