From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: "Kulasek, TomaszX" <tomaszx.kulasek@intel.com>,
"yliu@fridaylinux.org" <yliu@fridaylinux.org>
Cc: "Verkamp, Daniel" <daniel.verkamp@intel.com>,
"Harris, James R" <james.r.harris@intel.com>,
"Wodkowski, PawelX" <pawelx.wodkowski@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"Stojaczyk, DariuszX" <dariuszx.stojaczyk@intel.com>
Subject: Re: [dpdk-dev] [PATCH] vhost: add API for getting last_idx of vrings
Date: Thu, 19 Apr 2018 16:57:46 +0200 [thread overview]
Message-ID: <dcfe03e3-ef03-de4c-b4fa-618d1b3cad04@redhat.com> (raw)
In-Reply-To: <3042915272161B4EB253DA4D77EB373A605D3AE5@IRSMSX102.ger.corp.intel.com>
Hi Tomasz,
On 03/28/2018 11:31 AM, Kulasek, TomaszX wrote:
> Hi Maxime,
>
>> -----Original Message-----
>> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
>> Sent: Wednesday, March 28, 2018 10:57
>> To: Kulasek, TomaszX <tomaszx.kulasek@intel.com>; yliu@fridaylinux.org
>> Cc: Verkamp, Daniel <daniel.verkamp@intel.com>; Harris, James R
>> <james.r.harris@intel.com>; Wodkowski, PawelX <pawelx.wodkowski@intel.com>;
>> dev@dpdk.org; Stojaczyk, DariuszX <dariuszx.stojaczyk@intel.com>
>> Subject: Re: [dpdk-dev] [PATCH] vhost: add API for getting last_idx of vrings
>>
>> Hi Tomasz,
>>
>> On 03/05/2018 04:59 PM, Tomasz Kulasek wrote:
>>> vhost-net devices might keep track of last descriptors indices by
>>> themselves, and assuming they initially start at 0, but that is not the
>>> case for vhost-scsi. Initial last descriptor indices are set via
>>> VHOST_USER_SET_VRING_BASE message, and we cannot possibly predict what
>>> will they be. Setting these to vqueue->used->idx is also not an option,
>>> because there might be some yet unprocessed requests between these and
>>> the actual last_idx. This patch adds API for getting/setting last
>>> descriptor indices of vrings, so that they can be synchronized between
>>> user-device and rte_vhost.
>>>
>>> The last_idx flow could be as following:
>>>
>>> * vhost start,
>>> * received SET_VRING_BASE msg, last_idx is set on rte_vhost side,
>>> * created user-device, last_idx pulled from rte_vhost,
>>> * requests are being processed by user-device, last_idx changes,
>>> * destroyed user-device, last_idx pushed to rte_vhost,
>>> * at this point, vrings could be recreated and another SET_VRING_BASE
>>> message could arrive, so last_idx would be set
>>> * recreated user-device, last_idx pulled from rte_vhost.
>>>
>>>
>>> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
>>> Signed-off-by: Tomasz Kulasek <tomaszx.kulasek@intel.com>
>>> ---
>>> lib/librte_vhost/rte_vhost.h | 24 ++++++++++++++++++++++++
>>> lib/librte_vhost/vhost.c | 27 +++++++++++++++++++++++++++
>>> 2 files changed, 51 insertions(+)
>>>
>>
>> I agree with the patch, but it is missing the declaration of the new API
>> in rte_vhost_version.map.
>>
>> Thanks,
>> Maxime
>
> Yes, I will send v2.
Do you plan to send v2 for v18.02?
It can still make it to -rc2 if you post it early next week.
Thanks,
Maxime
> Tomasz
>
next prev parent reply other threads:[~2018-04-19 14:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 15:59 Tomasz Kulasek
2018-03-28 8:57 ` Maxime Coquelin
2018-03-28 9:31 ` Kulasek, TomaszX
2018-04-19 14:57 ` Maxime Coquelin [this message]
2018-07-26 15:43 ` Thomas Monjalon
2018-07-26 19:11 ` Stojaczyk, DariuszX
2018-07-26 19:15 ` Thomas Monjalon
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