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From: Thomas Monjalon <thomas@monjalon.net>
To: "Iremonger, Bernard" <bernard.iremonger@intel.com>
Cc: Andrew Rybchenko <arybchenko@solarflare.com>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"ophirmu@mellanox.com" <ophirmu@mellanox.com>
Subject: Re: [PATCH v3 1/4] app/testpmd: allow detaching a port not closed
Date: Wed, 17 Oct 2018 13:33:48 +0200	[thread overview]
Message-ID: <3413444.RgHUR81Cio@xps> (raw)
In-Reply-To: <8CEF83825BEC744B83065625E567D7C260D1268E@IRSMSX107.ger.corp.intel.com>

17/10/2018 12:30, Iremonger, Bernard:
> Hi Thomas,
> 
> From: Thomas Monjalon
> > 17/10/2018 08:26, Andrew Rybchenko:
> > > On 10/17/18 4:54 AM, Thomas Monjalon wrote:
> > > > The testpmd application aim is for testing; so order of operations
> > > > should not be enforced.
> > > >
> > > > There was a test to forbid detaching before closing a port.
> > > > However, it may interesting to test what happens in such case.
> > > > It is possible for a PMD to automatically close the port when detaching.
> > > >
> > > > Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> > >
> > > I'm afraid it could be a problem which the patch, since port close
> > > ensures that the port is not used for traffic forwarding.
> > > Right now the check is gone and we can detach port which is used for
> > > traffic forwarding on separate data cores.
> > > So, almost guaranteed crash.
> > 
> > Yes I can duplicate this check in detach_port().
> 
> I agree with Andrew that this will cause a crash.

As I answered, I will add a check that port is stopped.

> I don't understand why the sequence is changing here.
> The close(), detach()  sequence has been in place since the port hot plug work some years ago, user applications may already be using this sequence.

I explained the reason in the commit log:
Adding too much checks is wrong for a test application.
We must be free to call detach without close.

  reply	other threads:[~2018-10-17 11:33 UTC|newest]

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-07 23:39 [RFC] ethdev: complete closing to free all resources Thomas Monjalon
2018-09-10  8:03 ` Andrew Rybchenko
2018-09-10  8:42   ` Thomas Monjalon
2018-09-10  8:54     ` Andrew Rybchenko
2018-09-12 14:57       ` Thomas Monjalon
2018-09-12 15:44         ` Andrew Rybchenko
2018-09-28 12:46 ` Ferruh Yigit
2018-10-09 22:00   ` Thomas Monjalon
2018-10-09 22:17 ` [PATCH v2] ethdev: complete closing of port Thomas Monjalon
2018-10-10  6:15   ` Andrew Rybchenko
2018-10-10  7:44     ` Thomas Monjalon
2018-10-10  7:50       ` Andrew Rybchenko
2018-10-10  8:39         ` Thomas Monjalon
2018-10-10 15:01           ` Andrew Rybchenko
2018-10-10 16:43             ` Thomas Monjalon
2018-10-10 18:01               ` Andrew Rybchenko
2018-10-10 19:03                 ` Thomas Monjalon
2018-10-14 23:20 ` [PATCH v3 0/2] ethdev port freeing Thomas Monjalon
2018-10-14 23:20   ` [PATCH v3 1/2] ethdev: free all common data when releasing port Thomas Monjalon
2018-10-16 11:16     ` Andrew Rybchenko
2018-10-16 12:22       ` Thomas Monjalon
2018-10-16 12:47         ` Andrew Rybchenko
2018-10-16 12:52           ` Thomas Monjalon
2018-10-16 12:55             ` Andrew Rybchenko
2018-10-14 23:20   ` [PATCH v3 2/2] ethdev: complete closing of port Thomas Monjalon
2018-10-16 11:24     ` Andrew Rybchenko
2018-10-16 12:25       ` Thomas Monjalon
2018-10-17  1:54 ` [PATCH v3 0/4] ethdev port freeing Thomas Monjalon
2018-10-17  1:54   ` [PATCH v3 1/4] app/testpmd: allow detaching a port not closed Thomas Monjalon
2018-10-17  2:06     ` Thomas Monjalon
2018-10-17  6:26     ` Andrew Rybchenko
2018-10-17  8:20       ` Thomas Monjalon
2018-10-17 10:30         ` Iremonger, Bernard
2018-10-17 11:33           ` Thomas Monjalon [this message]
2018-10-17  1:54   ` [PATCH v3 2/4] ethdev: free all common data when releasing port Thomas Monjalon
2018-10-17  7:13     ` Andrew Rybchenko
2018-10-17  8:22       ` Thomas Monjalon
2018-10-17  1:54   ` [PATCH v3 3/4] ethdev: remove release function for secondary process Thomas Monjalon
2018-10-17  7:25     ` Andrew Rybchenko
2018-10-17  9:27       ` Thomas Monjalon
2018-10-17  1:54   ` [PATCH v3 4/4] ethdev: complete closing of port Thomas Monjalon
2018-10-17  2:12     ` Thomas Monjalon
2018-10-17 10:24   ` [PATCH v3 0/4] ethdev port freeing Shreyansh Jain
2018-10-17 11:31     ` Thomas Monjalon
2018-10-18  1:23 ` [PATCH v5 0/6] " Thomas Monjalon
2018-10-18  1:23   ` [PATCH v5 1/6] app/testpmd: fix ports list after removing several at once Thomas Monjalon
2018-10-18 10:40     ` Iremonger, Bernard
2018-10-18 11:29       ` Thomas Monjalon
2018-10-18 11:41         ` Iremonger, Bernard
2018-10-18 14:21           ` Thomas Monjalon
2018-10-18 16:42             ` Iremonger, Bernard
2018-10-18 17:06               ` Thomas Monjalon
2018-10-18 11:49         ` Wisam Monther
2018-10-18 13:22           ` Iremonger, Bernard
2018-10-18  1:23   ` [PATCH v5 2/6] app/testpmd: allow detaching a port not closed Thomas Monjalon
2018-10-18  7:45     ` Andrew Rybchenko
2018-10-18 10:51       ` Iremonger, Bernard
2018-10-18 11:24         ` Thomas Monjalon
2018-10-18  1:23   ` [PATCH v5 3/6] ethdev: fix doxygen comments of shared data fields Thomas Monjalon
2018-10-18  7:11     ` Andrew Rybchenko
2018-10-18  1:24   ` [PATCH v5 4/6] ethdev: free all common data when releasing port Thomas Monjalon
2018-10-18  7:13     ` Andrew Rybchenko
2018-10-18  1:24   ` [PATCH v5 5/6] ethdev: remove release function for secondary process Thomas Monjalon
2018-10-18  7:15     ` Andrew Rybchenko
2018-10-18  1:24   ` [PATCH v5 6/6] ethdev: complete closing of port Thomas Monjalon
2018-10-18  8:33     ` Andrew Rybchenko
2018-10-18  9:32       ` Thomas Monjalon
2018-10-19  2:07 ` [PATCH v6 0/6] ethdev port freeing Thomas Monjalon
2018-10-19  2:07   ` [PATCH v6 1/6] app/testpmd: update port list for multiple removals Thomas Monjalon
2018-10-19 14:32     ` Iremonger, Bernard
2018-10-19  2:07   ` [PATCH v6 2/6] app/testpmd: allow detaching a port not closed Thomas Monjalon
2018-10-19 14:32     ` Iremonger, Bernard
2018-10-19  2:07   ` [PATCH v6 3/6] ethdev: fix doxygen comments of shared data fields Thomas Monjalon
2018-10-19  2:07   ` [PATCH v6 4/6] ethdev: free all common data when releasing port Thomas Monjalon
2018-10-19  2:07   ` [PATCH v6 5/6] ethdev: remove release function for secondary process Thomas Monjalon
2018-10-19  2:07   ` [PATCH v6 6/6] ethdev: complete closing of port Thomas Monjalon
2018-10-19 10:13     ` Andrew Rybchenko
2018-10-22 15:43   ` [PATCH v6 0/6] ethdev port freeing Ferruh Yigit

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