netdev - Re: [PATCH] r8169: remove unneeded dirty

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Message-ID: <20130116212622.GA32073@electric-eye.fr.zoreil.com>
Date:	Wed, 16 Jan 2013 22:26:22 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	David Miller <davem@...emloft.net>
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: [PATCH] r8169: remove unneeded dirty_rx index

David Miller <davem@...emloft.net> :
[...]
> > @@ -6035,10 +6034,8 @@ static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, u32 budget
> >  	unsigned int count;
> >  
> >  	cur_rx = tp->cur_rx;
> > -	rx_left = NUM_RX_DESC + tp->dirty_rx - cur_rx;
> > -	rx_left = min(rx_left, budget);
> >  
> > -	for (; rx_left > 0; rx_left--, cur_rx++) {
> > +	for (rx_left = min(budget, NUM_RX_DESC); rx_left > 0; rx_left--, cur_rx++) {
> 
> Is this really equivalent?  I think cur_rx still needs to be
> incorporated into whatever you use as the initial rx_left.

The rx ring can't contain hole so the code above must be read with
"tp->cur_rx == tp->dirty_rx" in mind.

-- 
Ueimor
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