netdev - Re: [PATCH net-next 1/2] skbuff: Add pskb

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Message-ID: <20160422232750.GB1594@localhost.localdomain>
Date:	Fri, 22 Apr 2016 20:27:50 -0300
From:	marcelo.leitner@...il.com
To:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:	netdev@...r.kernel.org, rds-devel@....oracle.com,
	santosh.shilimkar@...cle.com, davem@...emloft.net,
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next 1/2] skbuff: Add pskb_extract() helper function

On Wed, Apr 20, 2016 at 03:17:41AM -0700, Sowmini Varadhan wrote:
...
> +/* Extract to_copy bytes starting at off from skb, and return this in
> + * a new skb
> + */
> +struct sk_buff *pskb_extract(struct sk_buff *skb, int off,
> +			     int to_copy, gfp_t gfp)
> +{
> +	struct sk_buff  *clone = skb_clone(skb, gfp);
> +
> +	if (!clone)
> +		return NULL;
> +
> +	if (pskb_carve(clone, off, gfp) < 0) {
> +		pr_warn("pskb_carve failed\n");

You most likely don't want these pr_warn

> +		kfree_skb(clone);
> +		return NULL;
> +	}
> +
> +	if (pskb_trim(clone, to_copy)) {
> +		pr_warn("pskb_trim failed\n");
> +		kfree_skb(clone);
> +		return NULL;
> +	}
> +	return clone;

Then these two blocks can be just:

	if (pskb_carve(clone, off, gfp) < 0 ||
	    pskb_trim(clone, to_copy)) {
		kfree_skb(clone);
		clone = NULL;
	}
	return clone;

  Marcelo

> +}
> +EXPORT_SYMBOL(pskb_extract);
> -- 
> 1.7.1
>