From: Stephen Hemminger <stephen@networkplumber.org>
To: Chas Williams <3chas3@gmail.com>
Cc: Ferruh Yigit <ferruh.yigit@intel.com>,
Thomas Monjalon <thomas@monjalon.net>,
dev@dpdk.org, Jianfeng Tan <jianfeng.tan@intel.com>,
Jingjing Wu <jingjing.wu@intel.com>,
Shijith Thotton <shijith.thotton@caviumnetworks.com>,
Gregory Etelson <gregory@weka.io>,
Harish Patil <harish.patil@cavium.com>,
George Prekas <george.prekas@epfl.ch>,
Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>,
Rasesh Mody <rasesh.mody@cavium.com>,
Lee Roberts <lee.roberts@hpe.com>
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH v2] igb_uio: prevent reset for a list of devices
Date: Mon, 13 Nov 2017 15:46:56 -0800 [thread overview]
Message-ID: <20171113154656.2e149727@xeon-e3> (raw)
In-Reply-To: <CAG2-Gkn1+Tqy_Cs-ybQ1HdoNNA8OzYEaptDfsVsRp+11t+-_bQ@mail.gmail.com>
On Wed, 8 Nov 2017 07:00:23 -0500
Chas Williams <3chas3@gmail.com> wrote:
> On Tue, Nov 7, 2017 at 5:26 PM, Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> On 11/7/2017 12:47 PM, Chas Williams wrote:
> > I will confess I haven't looked into the issue too hard since I have a
> > workaround. My first guess is that there is something going on with the IOMMU
> > and quiescing a PCI pass-through device/function from the guest (since I don't
> > think the IOMMU is "visible" to the guest) seems iffy.
> >
> > Most devices have some sort of reset to put the device into a known state for
> > setup/configuration (or enable/disable for the DMA engines). If this is done at
> > .dev_close(), shouldn't that be as sufficient as resetting the function?
>
> This is for the cases DPDK app terminated unexpectedly, proper exit path already
> does cleanup.
>
> Call a usermode helper from igb_uio that does an open/close on the device about to be released?
usermode helper is hated by upstream kernel developers. There are many problems
such as what namespace and security.
next prev parent reply other threads:[~2017-11-13 23:46 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-03 22:38 [dpdk-dev] [PATCH] " Ferruh Yigit
2017-11-03 23:03 ` Thomas Monjalon
2017-11-04 0:56 ` Mody, Rasesh
2017-11-06 18:48 ` [dpdk-dev] [PATCH v2] " Ferruh Yigit
2017-11-06 23:55 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2017-11-07 11:50 ` Chas Williams
2017-11-07 13:02 ` Thomas Monjalon
2017-11-07 18:12 ` Chas Williams
2017-11-07 18:49 ` Ferruh Yigit
2017-11-07 20:47 ` Chas Williams
2017-11-07 22:26 ` Ferruh Yigit
2017-11-08 12:00 ` Chas Williams
2017-11-10 1:40 ` Ferruh Yigit
2017-11-13 23:46 ` Stephen Hemminger [this message]
2017-11-07 13:13 ` Stephen Hemminger
2017-11-07 18:14 ` Chas Williams
2017-11-09 17:20 ` [dpdk-dev] ugb_uio: r3.8xlarge bind failure Gregory Etelson
2017-11-10 1:42 ` Ferruh Yigit
2017-11-10 2:11 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2017-11-10 6:36 ` [dpdk-dev] " Gregory Etelson
2017-11-15 15:44 ` Ferruh Yigit
2017-11-15 16:30 ` Gregory Etelson
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