netdev - Re: [PATCH v2 net-next 1/5] dsa: add support for Microchip KSZ tail tagging

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Date:   Sat, 13 May 2017 15:03:26 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Woojung.Huh@...rochip.com
Cc:     f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        sergei.shtylyov@...entembedded.com, netdev@...r.kernel.org,
        davem@...emloft.net, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v2 net-next 1/5] dsa: add support for Microchip KSZ tail
 tagging

On Fri, May 12, 2017 at 08:07:54PM +0000, Woojung.Huh@...rochip.com wrote:
> +	padlen = (skb->len >= ETH_ZLEN) ? 0 : ETH_ZLEN - skb->len;
> +
> +	if (skb_tailroom(skb) >= padlen + KSZ_INGRESS_TAG_LEN) {
> +		nskb = skb;
> +	} else {
> +		nskb = alloc_skb(NET_IP_ALIGN + skb->len +
> +				 padlen + KSZ_INGRESS_TAG_LEN, GFP_ATOMIC);

Hi Woojung

Thanks for reusing the existing skb when possible. This should help
with performance.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew