netdev - Re: [PATCH net-next] net: veth: rely on napi_build_skb in veth_convert_skb_to_xdp

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Date: Tue, 9 May 2023 09:01:43 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Lorenzo Bianconi <lorenzo@...nel.org>, <netdev@...r.kernel.org>
CC: <lorenzo.bianconi@...hat.com>, <bpf@...r.kernel.org>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <hawk@...nel.org>, <john.fastabend@...il.com>,
	<ast@...nel.org>, <daniel@...earbox.net>
Subject: Re: [PATCH net-next] net: veth: rely on napi_build_skb in
 veth_convert_skb_to_xdp_buff

On 2023/5/9 4:45, Lorenzo Bianconi wrote:
> Since veth_convert_skb_to_xdp_buff routine runs in veth_poll() NAPI,
> rely on napi_build_skb() instead of build_skb() to reduce skb allocation
> cost.

LGTM.
Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>

> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  drivers/net/veth.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index dce9f9d63e04..3ae496011640 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -747,7 +747,7 @@ static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
>  		if (!page)
>  			goto drop;
>  
> -		nskb = build_skb(page_address(page), PAGE_SIZE);
> +		nskb = napi_build_skb(page_address(page), PAGE_SIZE);
>  		if (!nskb) {
>  			page_pool_put_full_page(rq->page_pool, page, true);
>  			goto drop;
>