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From: Zoltan Kiss <zoltan.kiss@citrix.com>
To: Ian Campbell <Ian.Campbell@citrix.com>,
	Paul Durrant <Paul.Durrant@citrix.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	Wei Liu <wei.liu2@citrix.com>, "Tim (Xen.org)" <tim@xen.org>
Subject: Re: RING_HAS_UNCONSUMED_REQUESTS oddness
Date: Thu, 13 Mar 2014 12:28:31 +0000	[thread overview]
Message-ID: <5321A46F.1070008@citrix.com> (raw)
In-Reply-To: <1394713162.25873.48.camel@kazak.uk.xensource.com>

On 13/03/14 12:19, Ian Campbell wrote:
> On Thu, 2014-03-13 at 10:58 +0000, Paul Durrant wrote:
>>> -----Original Message-----
>>> From: Ian Campbell
>>> Sent: 13 March 2014 10:03
>>> To: Paul Durrant
>>> Cc: Zoltan Kiss; Wei Liu; xen-devel@lists.xenproject.org; Tim (Xen.org)
>>> Subject: Re: [Xen-devel] RING_HAS_UNCONSUMED_REQUESTS oddness
>>>
>>> On Thu, 2014-03-13 at 09:26 +0000, Paul Durrant wrote:
>>>> guarantee that netback will always respond in order on the rx ring.
>>>
>>> I don't believe this is guaranteed byt the protocol, even if it happens
>>> to work out that way for the Linux netback implementation.
>>>
>>
>> Indeed it's not guaranteed by the protocol but it's the only way that
>> (non-prefix) GSO can possibly work, which is why I think something
>> really needs to be documented.
>
> There are possibly ordering constraints on the completion of the gso
> info slot and the rest but I don't think there are any such restrictions
> on the fragment slots themselves, are there?

Well, the Linux frontend doesn't take the id from the response, it just 
assume that the response is in the same slot as the request.

  reply	other threads:[~2014-03-13 12:28 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-06 15:47 RING_HAS_UNCONSUMED_REQUESTS oddness Zoltan Kiss
2014-03-06 15:53 ` Ian Campbell
2014-03-06 16:31   ` Zoltan Kiss
2014-03-06 17:30     ` Tim Deegan
2014-03-06 21:39       ` Zoltan Kiss
2014-03-07  9:23         ` Paul Durrant
2014-03-07 17:43           ` Zoltan Kiss
2014-03-07 12:02         ` Wei Liu
2014-03-07 18:58           ` Zoltan Kiss
2014-03-11 15:55         ` Ian Campbell
2014-03-11 23:34           ` Zoltan Kiss
2014-03-13 16:38       ` [PATCH RFC] xen/public/ring.h: simplify RING_HAS_UNCONSUMED_REQUESTS() Tim Deegan
2014-03-22 14:18         ` Zoltan Kiss
2014-03-22 17:14           ` Tim Deegan
2014-03-24  7:38             ` Jan Beulich
2014-03-24  9:39               ` Paul Durrant
2014-03-24  9:59                 ` Jan Beulich
2014-03-24 11:03                   ` Paul Durrant
2014-03-24 12:23               ` Zoltan Kiss
2014-03-24 13:52                 ` Paul Durrant
2014-03-24 23:55                   ` Zoltan Kiss
2014-04-03  9:38         ` Tim Deegan
2014-04-03 15:34           ` Zoltan Kiss
2014-03-11 15:44 ` RING_HAS_UNCONSUMED_REQUESTS oddness Ian Campbell
2014-03-11 23:24   ` Zoltan Kiss
2014-03-12 10:28     ` Ian Campbell
2014-03-12 10:48       ` Roger Pau Monné
2014-03-12 11:25       ` Paul Durrant
2014-03-12 11:38       ` Paul Durrant
2014-03-12 14:41         ` Zoltan Kiss
2014-03-12 15:23           ` Paul Durrant
2014-03-12 15:42             ` Wei Liu
2014-03-12 15:56               ` Paul Durrant
2014-03-12 16:02               ` Paul Durrant
2014-03-12 16:13               ` Zoltan Kiss
2014-03-12 16:42                 ` Paul Durrant
2014-03-12 19:06                   ` Zoltan Kiss
2014-03-13  9:26                     ` Paul Durrant
2014-03-13 10:02                       ` Ian Campbell
2014-03-13 10:58                         ` Paul Durrant
2014-03-13 12:19                           ` Ian Campbell
2014-03-13 12:28                             ` Zoltan Kiss [this message]
2014-03-13 12:29                               ` Paul Durrant
2014-03-13 12:44                               ` Ian Campbell
2014-03-12 14:25       ` Zoltan Kiss
2014-03-12 14:27       ` Zoltan Kiss
2014-03-12 14:30         ` Ian Campbell
2014-03-12 15:14           ` Zoltan Kiss
2014-03-12 15:37             ` Ian Campbell
2014-03-12 17:14               ` Zoltan Kiss
2014-03-12 17:43                 ` Ian Campbell
2014-03-12 21:10                   ` Zoltan Kiss
2014-03-13 10:04                     ` Ian Campbell

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