netdev - Re: [PATCH v5 RFC 1/6] page_pool: frag API support for 32-bit arch with 64-bit DMA

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Date: Fri, 7 Jul 2023 16:59:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Yunsheng Lin <linyunsheng@...wei.com>
Cc: <davem@...emloft.net>, <pabeni@...hat.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, Lorenzo Bianconi <lorenzo@...nel.org>,
 Alexander Duyck <alexander.duyck@...il.com>, Liang Chen
 <liangchen.linux@...il.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>, Saeed Mahameed <saeedm@...dia.com>, Leon
 Romanovsky <leon@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Jesper
 Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas
 <ilias.apalodimas@...aro.org>, <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH v5 RFC 1/6] page_pool: frag API support for 32-bit arch
 with 64-bit DMA

On Thu, 29 Jun 2023 20:02:21 +0800 Yunsheng Lin wrote:
> +		/* Return error here to avoid mlx5e_page_release_fragmented()
> +		 * calling page_pool_defrag_page() to write to pp_frag_count
> +		 * which is overlapped with dma_addr_upper in 'struct page' for
> +		 * arch with PAGE_POOL_DMA_USE_PP_FRAG_COUNT being true.
> +		 */
> +		if (PAGE_POOL_DMA_USE_PP_FRAG_COUNT) {
> +			err = -EINVAL;
> +			goto err_free_by_rq_type;
> +		}

I told you not to do this in a comment on v4.
Keep the flag in page pool params and let the creation fail.