linux-kernel - Re: [PATCH v2 net-next 11/14] net: fec: move xdp_rxq_info* APIs out of fec_enet_create_page

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Message-ID: <aWpMW+jgIJpqH8NE@lizhi-Precision-Tower-5810>
Date: Fri, 16 Jan 2026 09:34:03 -0500
From: Frank Li <Frank.li@....com>
To: Wei Fang <wei.fang@....com>
Cc: shenwei.wang@....com, xiaoning.wang@....com, andrew+netdev@...n.ch,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net,
	hawk@...nel.org, john.fastabend@...il.com, sdf@...ichev.me,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, bpf@...r.kernel.org
Subject: Re: [PATCH v2 net-next 11/14] net: fec: move xdp_rxq_info* APIs out
 of fec_enet_create_page_pool()

On Fri, Jan 16, 2026 at 03:40:24PM +0800, Wei Fang wrote:
> Extract fec_xdp_rxq_info_reg() from fec_enet_create_page_pool() and move
> it out of fec_enet_create_page_pool(), so that it can be reused in the
> subsequent patches to support XDP zero copy mode.
>
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 58 ++++++++++++++++-------
>  1 file changed, 40 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index c1786ccf0443..a418f0153d43 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -489,23 +489,7 @@ fec_enet_create_page_pool(struct fec_enet_private *fep,
>  		return err;
>  	}
>
> -	err = xdp_rxq_info_reg(&rxq->xdp_rxq, fep->netdev, rxq->id, 0);
> -	if (err < 0)
> -		goto err_free_pp;
> -
> -	err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL,
> -					 rxq->page_pool);
> -	if (err)
> -		goto err_unregister_rxq;
> -
>  	return 0;
> -
> -err_unregister_rxq:
> -	xdp_rxq_info_unreg(&rxq->xdp_rxq);
> -err_free_pp:
> -	page_pool_destroy(rxq->page_pool);
> -	rxq->page_pool = NULL;
> -	return err;

Noramlly this patch should put helper fec_xdp_rxq_info_reg() before
fec_enet_create_page_pool(). then call fec_xdp_rxq_info_reg() here.

>  }
>
>  static void fec_txq_trigger_xmit(struct fec_enet_private *fep,
> @@ -3419,6 +3403,38 @@ static const struct ethtool_ops fec_enet_ethtool_ops = {
>  	.self_test		= net_selftest,
>  };
>
> +static int fec_xdp_rxq_info_reg(struct fec_enet_private *fep,
> +				struct fec_enet_priv_rx_q *rxq)
> +{
> +	struct net_device *ndev = fep->netdev;
> +	int err;
> +
> +	err = xdp_rxq_info_reg(&rxq->xdp_rxq, ndev, rxq->id, 0);
> +	if (err) {
> +		netdev_err(ndev, "Failed to register xdp rxq info\n");
> +		return err;
> +	}
> +
> +	err = xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL,
> +					 rxq->page_pool);
> +	if (err) {
> +		netdev_err(ndev, "Failed to register XDP mem model\n");
> +		xdp_rxq_info_unreg(&rxq->xdp_rxq);
> +
> +		return err;
> +	}
> +
> +	return 0;
> +}
> +
> +static void fec_xdp_rxq_info_unreg(struct fec_enet_priv_rx_q *rxq)
> +{
> +	if (xdp_rxq_info_is_reg(&rxq->xdp_rxq)) {
> +		xdp_rxq_info_unreg_mem_model(&rxq->xdp_rxq);
> +		xdp_rxq_info_unreg(&rxq->xdp_rxq);
> +	}
> +}
> +
>  static void fec_enet_free_buffers(struct net_device *ndev)
>  {
>  	struct fec_enet_private *fep = netdev_priv(ndev);
> @@ -3430,6 +3446,9 @@ static void fec_enet_free_buffers(struct net_device *ndev)
>
>  	for (q = 0; q < fep->num_rx_queues; q++) {
>  		rxq = fep->rx_queue[q];
> +
> +		fec_xdp_rxq_info_unreg(rxq);
> +
>  		for (i = 0; i < rxq->bd.ring_size; i++)
>  			page_pool_put_full_page(rxq->page_pool, rxq->rx_buf[i],
>  						false);
> @@ -3437,8 +3456,6 @@ static void fec_enet_free_buffers(struct net_device *ndev)
>  		for (i = 0; i < XDP_STATS_TOTAL; i++)
>  			rxq->stats[i] = 0;
>
> -		if (xdp_rxq_info_is_reg(&rxq->xdp_rxq))
> -			xdp_rxq_info_unreg(&rxq->xdp_rxq);

why put fec_xdp_rxq_info_unreg() here to do exactly replacement.

Frank
>  		page_pool_destroy(rxq->page_pool);
>  		rxq->page_pool = NULL;
>  	}
> @@ -3593,6 +3610,11 @@ fec_enet_alloc_rxq_buffers(struct net_device *ndev, unsigned int queue)
>  	/* Set the last buffer to wrap. */
>  	bdp = fec_enet_get_prevdesc(bdp, &rxq->bd);
>  	bdp->cbd_sc |= cpu_to_fec16(BD_ENET_RX_WRAP);
> +
> +	err = fec_xdp_rxq_info_reg(fep, rxq);
> +	if (err)
> +		goto err_alloc;
> +
>  	return 0;
>
>   err_alloc:
> --
> 2.34.1
>