netdev - Re: [Xen-devel] [PATCH 5/6] xen-netback: coalesce slots before copying

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Date:	Mon, 25 Mar 2013 17:06:01 +0000
From:	Wei Liu <liuw@...w.name>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Wei Liu <wei.liu2@...rix.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH 5/6] xen-netback: coalesce slots before copying

On Mon, Mar 25, 2013 at 4:58 PM, Wei Liu <liuw@...w.name> wrote:
>
> So it is a bit tricky here. Let me clarify this, the head field is
> used to indicate the start of a new tx requests queue and the end of
> previous queue.
>
> Imagine a sequence of head fileds(I = INVALID_PENDING_RING_IDX below),
> the number is the starting index of pending ring.
>
>   .... 0 I I I 5 I I ...
>
> consume all tx_info but not setting I to 0 (or any number other then
> I) makes the sequence remains the same as before. The in subsequent
> call to process next SKB, which has 3 extra slots, which makes the

Sorry, should be "4 extra slots"

sequence looks like

  .... 8 | | | | | | ...

but in fact the correct sequence should be

  .... 8 | | | | 0 0 ...


Wei.
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