linux-kernel - Re: [PATCH V3 net-next] net: fec: add XDP

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Message-ID: <20230802104706.5ce541e9@kernel.org>
Date:   Wed, 2 Aug 2023 10:47:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Wei Fang <wei.fang@....com>
Cc:     davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        shenwei.wang@....com, xiaoning.wang@....com, ast@...nel.org,
        daniel@...earbox.net, hawk@...nel.org, john.fastabend@...il.com,
        netdev@...r.kernel.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH V3 net-next] net: fec: add XDP_TX feature support

On Mon, 31 Jul 2023 14:00:25 +0800 Wei Fang wrote:
>  		} else {
> -			xdp_return_frame(xdpf);
> +			xdp_return_frame_rx_napi(xdpf);

If you implement Jesper's syncing suggestions, I think you can use

	page_pool_put_page(pool, page, 0, true);

for XDP_TX here to avoid the DMA sync on page recycle.