linux-kernel - Re: [PATCH net-next] sfc: eliminate xdp_rxq_info

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Message-ID: <aGPiGHGjtWAgXxRG@soc-5CG4396X81.clients.intel.com>
Date: Tue, 1 Jul 2025 15:26:48 +0200
From: Larysa Zaremba <larysa.zaremba@...el.com>
To: Fushuai Wang <wangfushuai@...du.com>
CC: <ecree.xilinx@...il.com>, <andrew+netdev@...n.ch>, <davem@...emloft.net>,
	<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
	<netdev@...r.kernel.org>, <linux-net-drivers@....com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] sfc: eliminate xdp_rxq_info_valid using XDP
 base API

On Sat, Jun 28, 2025 at 01:10:16PM +0800, Fushuai Wang wrote:
> Commit eb9a36be7f3e ("sfc: perform XDP processing on received packets")
> use xdp_rxq_info_valid to track failures of xdp_rxq_info_reg().
> However, this driver-maintained state becomes redundant since the XDP
> framework already provides xdp_rxq_info_is_reg() for checking registration
> status.
> 
> Signed-off-by: Fushuai Wang <wangfushuai@...du.com>

Reviewed-by: Larysa Zaremba <larysa.zaremba@...el.com>

> ---
>  drivers/net/ethernet/sfc/net_driver.h | 2 --
>  drivers/net/ethernet/sfc/rx_common.c  | 6 +-----
>  2 files changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
> index 5c0f306fb019..b98c259f672d 100644
> --- a/drivers/net/ethernet/sfc/net_driver.h
> +++ b/drivers/net/ethernet/sfc/net_driver.h
> @@ -404,7 +404,6 @@ struct efx_rx_page_state {
>   * @old_rx_packets: Value of @rx_packets as of last efx_init_rx_queue()
>   * @old_rx_bytes: Value of @rx_bytes as of last efx_init_rx_queue()
>   * @xdp_rxq_info: XDP specific RX queue information.
> - * @xdp_rxq_info_valid: Is xdp_rxq_info valid data?.
>   */
>  struct efx_rx_queue {
>  	struct efx_nic *efx;
> @@ -443,7 +442,6 @@ struct efx_rx_queue {
>  	unsigned long old_rx_packets;
>  	unsigned long old_rx_bytes;
>  	struct xdp_rxq_info xdp_rxq_info;
> -	bool xdp_rxq_info_valid;
>  };
>  
>  enum efx_sync_events_state {
> diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c
> index f4f75299dfa9..5306f4c44be4 100644
> --- a/drivers/net/ethernet/sfc/rx_common.c
> +++ b/drivers/net/ethernet/sfc/rx_common.c
> @@ -269,8 +269,6 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
>  			  "Failure to initialise XDP queue information rc=%d\n",
>  			  rc);
>  		efx->xdp_rxq_info_failed = true;
> -	} else {
> -		rx_queue->xdp_rxq_info_valid = true;
>  	}
>  
>  	/* Set up RX descriptor ring */
> @@ -302,10 +300,8 @@ void efx_fini_rx_queue(struct efx_rx_queue *rx_queue)
>  
>  	efx_fini_rx_recycle_ring(rx_queue);
>  
> -	if (rx_queue->xdp_rxq_info_valid)
> +	if (xdp_rxq_info_is_reg(&rx_queue->xdp_rxq_info))
>  		xdp_rxq_info_unreg(&rx_queue->xdp_rxq_info);
> -
> -	rx_queue->xdp_rxq_info_valid = false;
>  }
>  
>  void efx_remove_rx_queue(struct efx_rx_queue *rx_queue)
> -- 
> 2.36.1
> 
>