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From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Igor Ryzhov <iryzhov@nfware.com>, Elad Nachman <eladv6@gmail.com>
Cc: dev <dev@dpdk.org>, Dan Gora <dg@adax.com>,
	Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [dpdk-dev] [PATCH 2/2] kni: fix rtnl deadlocks and race conditions v4
Date: Mon, 15 Mar 2021 16:58:55 +0000
Message-ID: <f14f683e-51a6-7a82-1100-709181c59189@intel.com> (raw)
In-Reply-To: <20210301083820.640dde15@hermes.local>

On 3/1/2021 4:38 PM, Stephen Hemminger wrote:
> On Mon, 1 Mar 2021 11:10:01 +0300
> Igor Ryzhov <iryzhov@nfware.com> wrote:
> 
>> Stephen,
>>
>> No, I don't have a better proposal, but I think it is not correct to change
>> the behavior of KNI (making link down without a real response).
>> Even though we know that communicating with userspace under rtnl_lock is a
>> bad idea, it works as it is for many years already.
>>
>> Elad,
>>
>> I agree with you that KNI should be removed from the main tree if it is not
>> possible to fix this __dev_close_many issue.
>> There were discussions about this multiple times already, but no one is
>> working on this AFAIK.
>> Last time the discussion was a month ago:
>> https://www.mail-archive.com/dev@dpdk.org/msg196033.html
>>
>> Igor
> 
> The better proposal would be to make DPDK virtio smarter.
> There already is virtio devices that must handle this (VDPA) etc.
> And when you can control link through virtio, then put a big warning
> in KNI that says "Don't use this"
> 

Hi Igor, Elad,

I think it is reasonable to do the ifdown as async to solve the problem,
still we can make sync default, and async with kernel parameter, to cover both case.

I will put more details on the patches.

  reply	other threads:[~2021-03-15 16:59 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-26 14:46 [dpdk-dev] [PATCH] kni: fix rtnl deadlocks and race conditions Elad Nachman
2021-02-19 18:41 ` Ferruh Yigit
2021-02-21  8:03   ` Elad Nachman
2021-02-22 15:58     ` Ferruh Yigit
2021-02-23 12:05 ` [dpdk-dev] [PATCH V2] kni: fix rtnl deadlocks and race conditions v2 Elad Nachman
2021-02-23 12:53   ` Ferruh Yigit
2021-02-23 13:44 ` [dpdk-dev] [PATCH 1/2] kni: fix rtnl deadlocks and race conditions v3 Elad Nachman
2021-02-23 13:45 ` [dpdk-dev] [PATCH 2/2] " Elad Nachman
2021-02-24 12:49   ` Igor Ryzhov
2021-02-24 13:33     ` Elad Nachman
2021-02-24 14:04       ` Igor Ryzhov
2021-02-24 14:06         ` Elad Nachman
2021-02-24 14:41           ` Igor Ryzhov
2021-02-24 14:56             ` Elad Nachman
2021-02-24 15:18               ` Igor Ryzhov
     [not found]                 ` <CACXF7qkhkzFc-=v=iiBzh2V7rLjk1U34VUfPbNrnYJND_0TKHQ@mail.gmail.com>
2021-02-24 16:31                   ` Igor Ryzhov
2021-02-24 15:54     ` Stephen Hemminger
2021-02-25 14:32 ` [dpdk-dev] [PATCH 1/2] kni: fix kernel deadlock when using mlx devices Elad Nachman
2021-02-25 14:32   ` [dpdk-dev] [PATCH 2/2] kni: fix rtnl deadlocks and race conditions v4 Elad Nachman
2021-02-25 21:01     ` Igor Ryzhov
2021-02-26 15:48       ` Stephen Hemminger
2021-02-26 17:43         ` Elad Nachman
2021-03-01  8:10           ` Igor Ryzhov
2021-03-01 16:38             ` Stephen Hemminger
2021-03-15 16:58               ` Ferruh Yigit [this message]
2021-03-01 20:27             ` Dan Gora
2021-03-01 21:26               ` Dan Gora
2021-03-02 16:44                 ` Elad Nachman
2021-03-15 17:17     ` Ferruh Yigit
2021-03-16 18:35       ` Elad Nachman
2021-03-16 18:42         ` Ferruh Yigit
2021-03-15 17:17   ` [dpdk-dev] [PATCH 1/2] kni: fix kernel deadlock when using mlx devices Ferruh Yigit
2021-03-29 14:36 ` [dpdk-dev] [PATCH v5 1/3] kni: refactor user request processing Ferruh Yigit
2021-03-29 14:36   ` [dpdk-dev] [PATCH v5 2/3] kni: support async user request Ferruh Yigit
2021-03-29 14:36   ` [dpdk-dev] [PATCH v5 3/3] kni: fix kernel deadlock when using mlx devices Ferruh Yigit
2021-04-09 14:56     ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2021-04-12 14:35       ` Elad Nachman
2021-04-20 23:07         ` Thomas Monjalon
2021-04-23  8:41           ` Igor Ryzhov
2021-04-23  8:59             ` Ferruh Yigit
2021-04-23 12:43               ` Igor Ryzhov
2021-04-23 12:58                 ` Igor Ryzhov

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