netdev - Re: [PATCH net] netpoll: linearize skb before accessing its data

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Message-ID: <20131022063714.GI1544@neomailbox.net>
Date:	Tue, 22 Oct 2013 08:37:14 +0200
From:	Antonio Quartulli <antonio@...hcoding.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] netpoll: linearize skb before accessing its data

On Tue, Oct 22, 2013 at 02:25:25AM -0400, David Miller wrote:
> From: Antonio Quartulli <antonio@...hcoding.com>
> Date: Tue, 22 Oct 2013 08:06:35 +0200
> 
> > But rx_hook() does not receive any skb:
> > 
> > 609                 np->rx_hook(np, ntohs(uh->source),
> > 610                                (char *)(uh+1),
> > 611                                ulen - sizeof(struct udphdr));
> > 
> > it just receives a pointer to the data and can't do anything to make it linear.
> > (uh is a pointer to the udp header). Am I missing something?
> 
> Then this hook's API needs to be fixed, it's completely broken.
> 
> Make it pass the SKB and the appropriate offset (from skb->data) in
> bytes.
> 

Ok I will do that. But I think this API change must go into net-next, right?
Otherwise we would break every existing user.

What about resending this patch to net (after having removed the pskb_may_pull()
as pointed out by Eric) and then fixing the API in net-next?

-- 
Antonio Quartulli

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