netdev - Re: [PATCH RFC v2 3/3] udp: Support UDP fraglist GRO/GSO.

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Date:   Mon, 28 Jan 2019 17:37:22 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org
Cc:     Willem de Bruijn <willemb@...gle.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH RFC v2 3/3] udp: Support UDP fraglist GRO/GSO.

Hi,

On Mon, 2019-01-28 at 09:50 +0100, Steffen Klassert wrote:
> diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
> index 584635db9231..c0be33216750 100644
> --- a/net/ipv4/udp_offload.c
> +++ b/net/ipv4/udp_offload.c
[...]
> @@ -379,8 +397,17 @@ static struct sk_buff *udp_gro_receive_segment(struct list_head *head,
>  		 * Under small packet flood GRO count could elsewhere grow a lot
>  		 * leading to execessive truesize values
>  		 */
> -		if (!skb_gro_receive(p, skb) &&
> -		    NAPI_GRO_CB(p)->count >= UDP_GRO_CNT_MAX)
> +		if (NAPI_GRO_CB(skb)->is_flist) {
> +			if (!pskb_may_pull(skb, skb_gro_offset(skb)))
> +				return NULL;
> +			ret = skb_gro_receive_list(p, skb);
> +		} else {
> +			skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
> +
> +			ret = skb_gro_receive(p, skb);
> +		}
> +
> +		if (!ret && NAPI_GRO_CB(p)->count > UDP_GRO_CNT_MAX)
                                                  ^^
Minor nitpick: here we may want to preserve the '>=' operator.

Note: I've not finished looking at the patches yet, I'll try to provide
some benck-marking and it will take some time.

Cheers,

Paolo