Re: [RFC net-next] eth: fbnic: use ring->page_pool instead of page->pp in fbnic_clean_twq1()

[Jakub Kicinski <kuba@kernel.org>]

On Wed, 19 Nov 2025 10:11:46 +0900 Byungchul Park wrote:
> With the planned removal of @pp from struct page, we should access the
> page pool pointer through other means.  Use @page_pool in struct
> fbnic_ring instead.
> 
> Signed-off-by: Byungchul Park <byungchul@sk.com>
> ---
> I should admit I'm not used to the following code.  So I'd like to ask
> how to alter page->pp to avoid accessing @pp through struct page
> directly.  Does the following change work?  Or can you suggest other
> ways to achieve it?

@ring in this context is the Tx ring, but it's the Rx ring that has the
page_pool pointer. Each Rx+Tx queue pair has 6 rings in total. You need
the sub0/sub1 ring of the Rx queue from which the page came here.

> diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
> index b1e8ce89870f..95f158ba6fa2 100644
> --- a/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
> +++ b/drivers/net/ethernet/meta/fbnic/fbnic_txrx.c
> @@ -653,7 +653,7 @@ static void fbnic_clean_twq1(struct fbnic_napi_vector *nv, bool pp_allow_direct,
>  				 FBNIC_TWD_TYPE_AL;
>  		total_bytes += FIELD_GET(FBNIC_TWD_LEN_MASK, twd);
>  
> -		page_pool_put_page(page->pp, page, -1, pp_allow_direct);
> +		page_pool_put_page(ring->page_pool, page, -1, pp_allow_direct);
>  next_desc:
>  		head++;
>  		head &= ring->size_mask;