netdev - Re: [PATCH net-next v2 1/3] dsa: add support for Arrow XRS700x tag trailer

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Message-ID: <20201125203429.GF2073444@lunn.ch>
Date:   Wed, 25 Nov 2020 21:34:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     George McCollister <george.mccollister@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller " <davem@...emloft.net>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/3] dsa: add support for Arrow XRS700x tag
 trailer

> +static struct sk_buff *xrs700x_rcv(struct sk_buff *skb, struct net_device *dev,
> +				   struct packet_type *pt)
> +{
> +	int source_port;
> +	u8 *trailer;
> +
> +	if (skb_linearize(skb))
> +		return NULL;

Something for Vladimir:

Could this linearise be moved into the core, depending on the
tail_tag?

> +	if (pskb_trim_rcsum(skb, skb->len - 1))
> +		return NULL;

And the overhead is also in dsa_devlink_ops, so maybe this can be
moved as well?

      Andrew