netdev - Re: [PATCH 10/13] net: add paged frag destructor to skb_fill_page

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Date:	Fri, 22 Jul 2011 22:07:52 +0100
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Michał Mirosław <mirqus@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"devel@...n-fcoe.org" <devel@...n-fcoe.org>
Subject: Re: [PATCH 10/13] net: add paged frag destructor to
 skb_fill_page_desc()

On Fri, 2011-07-22 at 20:58 +0100, Michał Mirosław wrote:
> 2011/7/22 Ian Campbell <ian.campbell@...rix.com>:
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 9818fe2..faee8d3 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -1134,12 +1134,14 @@ static inline int skb_pagelen(const struct sk_buff *skb)
> >  * Does not take any additional reference on the fragment.
> >  */
> >  static inline void __skb_fill_page_desc(struct sk_buff *skb, int i,
> > -                                       struct page *page, int off, int size)
> > +                                       struct page *page,
> > +                                       struct skb_frag_destructor *destroy,
> > +                                       int off, int size)
> >  {
> >        skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
> >
> >        frag->page.p              = page;
> > -       frag->page.destructor     = NULL;
> > +       frag->page.destructor     = destroy;
> >        frag->page_offset         = off;
> >        frag->size                = size;
> >  }
> 
> You could just rename this function to e.g.
> __skb_fill_fragile_page_desc() (or whatever name) add an inline
> wrapper calling it with destroy == NULL. This will avoid touching all
> those drivers which won't ever need this functionality.

I could call this variant __skb_frag_init (which I think better fits
into the pattern of the new functions) and leave the existing
__skb_fill_page_desc as a compat wrapper if that's preferred but I was
trying to avoid duplicating up constructors just for different sets of
defaults.
 
Ian.

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