netdev - Re: [PATCH net] net: sched: shrink struct qdisc_skb

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Date:	Thu, 18 Sep 2014 12:14:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Or Gerlitz <or.gerlitz@...il.com>,
	Govindarajulu Varadarajan <_govind@....com>,
	Yinghai Lu <yinghai@...nel.org>,
	David Miller <davem@...emloft.net>,
	NetDev <netdev@...r.kernel.org>, ssujith@...co.com,
	gvaradar@...co.com, "Christian Benvenuti (benve)" <benve@...co.com>
Subject: Re: [PATCH net] net: sched: shrink struct qdisc_skb_cb to 28 bytes

On Thu, 2014-09-18 at 11:07 -0700, Joe Perches wrote:

> > +static inline struct ipoib_cb *ipoib_skb_cb(const struct sk_buff *skb)
> > +{
> > +	BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct ipoib_cb));
> > +	return (struct ipoib_cb *)skb->cb;
> > +}
> 
> It seems better not to use const for the struct sk_buff * here.
> 
> Neither of the uses take a const struct sk_buff *

Thats pretty standard, check for other similar constructs like that.


static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
{
        return (struct qdisc_skb_cb *)skb->cb;
}

This allows uses of the helper when the skb is only read (has the const qual)



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