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From: Shijith Thotton <shijith.thotton@caviumnetworks.com>
To: Gregory Etelson <gregory@weka.io>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
	dev@dpdk.org, Ferruh Yigit <ferruh.yigit@intel.com>,
	Qi Zhang <qi.z.zhang@intel.com>,
	Wenzhuo Lu <wenzhuo.lu@intel.com>
Subject: Re: [dpdk-dev] i40e igb_uio: reset pci on process exit
Date: Mon, 29 May 2017 15:18:59 +0530	[thread overview]
Message-ID: <20170529094858.GA28265@localhost.localdomain> (raw)
In-Reply-To: <6458984.zlYVzvDLUS@polaris>

On Fri, May 26, 2017 at 07:14:55PM +0300, Gregory Etelson wrote:
>    I did not look into VFIO driver yet
> 
>     
> 
>    Regards,
> 
>    Gregory
> 
>     
> 
>    On Friday, 26 May 2017 18:53:21 IDT Stephen Hemminger wrote:
> 
>    > On Fri, 26 May 2017 09:17:33 +0300
> 
>    > Gregory Etelson <gregory@weka.io> wrote:
> 
>    >
> 
>    > > Thank you.
> 
>    > >
> 
>    > > Regards,
> 
>    > > Gregory
> 
>    > >
> 
>    > > On Friday, 26 May 2017 09:05:11 IDT Shijith Thotton wrote:
> 
>    > > > On Fri, May 26, 2017 at 07:30:58AM +0300, Gregory Etelson wrote:
> 
>    > > >
> 
>    > > > Hi Gregory,
> 
>    > > >
> 
>    > > > The patch is useful for LiquidIO PMD as we can avoid VF FLR request
>    to
> 
>    > > > PF. One comment inline..
> 
>    > > >
> 
>    > > > [..]
> 
>    > > > > > >
> 
>    > > > > > > +static int
> 
>    > > > > > > +igbuio_pci_release(struct uio_info *info, struct inode
>    *inode)
> 
>    > > > > > > +{
> 
>    > > > > > > + int ret;
> 
>    > > > > > > + struct rte_uio_pci_dev *udev = info->priv;
> 
>    > > > > > > + struct pci_dev *dev = udev->pdev;
> 
>    > > > > > > + ret = __pci_reset_function(dev);
> 
>    > > >
> 
>    > > > s/__pci_reset_function/pci_reset_function
> 
>    > > >
> 
>    > > > > > > + dev_info(&dev->dev, "pci_reset_function %s \n",
> 
>    > > > > > > + ret == 0 ? "succeded" : "failed");
> 
>    > > > > > > + return 0;
> 
>    > > > > > > +}
> 
>    > > > [..]
> 
>    > > >
> 
>    > > > Thanks,
> 
>    > > > Shijith
> 
>    > > >
> 
>    > >
> 
>    >
> 
>    > What does VFIO do?
> 
>    >
> 
>    > It looks like in vfio case pci_enable is held off until open and
>    pci_disable is done
> 
>    > on close. There are other things that may need to be done to make close
>    work
> 
>    > correctly. Like turning of msix. Also reset may not always be possible.
>

Better follow VFIO as Stephen advised. VFIO does pci reset inside open[1] and
tries to reset device during release[2]. 

1. elixir.free-electrons.com/linux/latest/source/drivers/vfio/pci/vfio_pci.c#L229
2. elixir.free-electrons.com/linux/latest/source/drivers/vfio/pci/vfio_pci.c#L361

static int
igbuio_pci_open(struct uio_info *info, struct inode *inode)
{
       struct rte_uio_pci_dev *udev = info->priv;
       struct pci_dev *dev = udev->pdev;

       return pci_reset_function(dev);
}

and.. 
	udev->info.open = igbuio_pci_open;

  reply	other threads:[~2017-05-29  9:49 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-24 11:22 Gregory Etelson
2017-05-25 18:42 ` Stephen Hemminger
2017-05-26  4:30   ` Gregory Etelson
2017-05-26  6:05     ` Shijith Thotton
2017-05-26  6:17       ` Gregory Etelson
2017-05-26 15:53         ` Stephen Hemminger
2017-05-26 16:14           ` Gregory Etelson
2017-05-29  9:48             ` Shijith Thotton [this message]
2017-05-29 10:01               ` Gregory Etelson
2017-05-29 11:01                 ` Shijith Thotton
2017-05-29 11:21                   ` Gregory Etelson
2017-05-31 11:09                     ` [dpdk-dev] [RFC PATCH] igb_uio: issue FLR during open and release of device file Shijith Thotton
2017-05-31 12:20                       ` Ferruh Yigit
2017-05-31 15:30                         ` Stephen Hemminger
2017-05-31 17:11                           ` Ferruh Yigit
2017-06-01 11:35                             ` Shijith Thotton
2017-06-01 11:14                         ` Gregory Etelson
2017-06-04  7:22                         ` Gregory Etelson
2017-06-05  2:29                           ` Tan, Jianfeng
2017-06-05  5:57                             ` Gregory Etelson
2017-05-31 15:29                       ` Stephen Hemminger
2017-06-12  9:38                       ` [dpdk-dev] [PATCH] " Shijith Thotton
2017-07-05 23:42                         ` Thomas Monjalon
2017-07-06 16:41                         ` Ferruh Yigit
2017-07-06 17:27                           ` Gregory Etelson
2017-07-07 10:03                             ` Shijith Thotton
2017-07-07 10:16                               ` Ferruh Yigit
2017-07-07 11:13                         ` [dpdk-dev] [PATCH v2] " Shijith Thotton
2017-07-07 15:10                           ` Ferruh Yigit
2017-07-10  3:07                             ` Gregory Etelson
2017-07-11  5:42                               ` Gregory Etelson
2017-07-11 11:36                                 ` Gregory Etelson
2017-07-10  3:38                           ` Tan, Jianfeng
2017-07-10  7:10                             ` Shijith Thotton
2017-07-10  9:00                               ` Tan, Jianfeng
2017-07-10 10:42                                 ` Shijith Thotton
2017-07-12  3:37                                   ` Tan, Jianfeng
2017-07-12  3:40                           ` Tan, Jianfeng
2017-07-16  4:22                             ` Gregory Etelson
2017-07-19 13:32                             ` Ferruh Yigit
2017-07-19 16:19                               ` Gregory Etelson
2017-07-20 22:36                                 ` Thomas Monjalon

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