[dpdk-stable] [PATCH] app/testpmd: avoid exit without resource release

[dpdk-stable] [PATCH] app/testpmd: avoid exit without resource release

[dapengx.yu]

From: YU DAPENG <dapengx.yu@intel.com>

In interactive mode, if testpmd exit by calling rte_exit without cmdline
resource release, terminal will not echo keyboard input. So add code to
just show error message, but not exit testpmd when unexpected happens
on starting packet forwarding in interactive mode. User can type "quit"
to exit testpmd later.

Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional configuration")
Cc: stable@dpdk.org

Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
---
 app/test-pmd/testpmd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index 33fc0fddf..0071c7235 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2194,10 +2194,18 @@ start_packet_forwarding(int with_tx_first)
 
 	if ((strcmp(cur_fwd_eng->fwd_mode_name, "rxonly") != 0 &&
 		strcmp(cur_fwd_eng->fwd_mode_name, "txonly") != 0) &&
-		(!nb_rxq || !nb_txq))
+		(!nb_rxq || !nb_txq)) {
+#ifdef RTE_LIB_CMDLINE
+		if (interactive == 1) {
+			printf("Either rxq or txq are 0, cannot use %s fwd mode\n",
+				cur_fwd_eng->fwd_mode_name);
+			return;
+		}
+#endif
 		rte_exit(EXIT_FAILURE,
 			"Either rxq or txq are 0, cannot use %s fwd mode\n",
 			cur_fwd_eng->fwd_mode_name);
+	}
 
 	if (all_ports_started() == 0) {
 		printf("Not all ports were started\n");
-- 
2.27.0

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Stephen Hemminger]

On Thu, 24 Dec 2020 11:57:48 +0800
dapengx.yu@intel.com wrote:

> From: YU DAPENG <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without cmdline
> resource release, terminal will not echo keyboard input. So add code to
> just show error message, but not exit testpmd when unexpected happens
> on starting packet forwarding in interactive mode. User can type "quit"
> to exit testpmd later.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: YU DAPENG <dapengx.yu@intel.com>

Sounds like a more generic problem with rte_exit and librte_cmdline.
Would it better to fix it in librte_cmdline by adding an atexit() handler.

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Yu, DapengX]

Hi Stephen,

Do you mean this solution?
1. support atexit() in librte_eal, other component can use it to register a function to be called when rte_exit() is called.
2. in librte_cmdline, use atexit() to register a function to release resource 

I am looking forward to more comments from other maintainers, since this solution will modify librte_eal and librte_cmdline, but not just testpmd app.


-----Original Message-----
From: Stephen Hemminger [mailto:stephen@networkplumber.org] 
Sent: Friday, December 25, 2020 11:03 AM
To: Yu, DapengX <dapengx.yu@intel.com>
Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

On Thu, 24 Dec 2020 11:57:48 +0800
dapengx.yu@intel.com wrote:

> From: YU DAPENG <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without 
> cmdline resource release, terminal will not echo keyboard input. So 
> add code to just show error message, but not exit testpmd when 
> unexpected happens on starting packet forwarding in interactive mode. User can type "quit"
> to exit testpmd later.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional 
> configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: YU DAPENG <dapengx.yu@intel.com>

Sounds like a more generic problem with rte_exit and librte_cmdline.
Would it better to fix it in librte_cmdline by adding an atexit() handler.

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Yu, DapengX]

Hi Wenzhuo, Beilei, Bernard

I need testpmd app maintainers' comment :
    Do you prefer the simple solution in this patch or Stephen's comprehensive and generic solution(which will modify librte_cmdline, testpmd (and maybe rte_exit()))?
So I can continue resolving the defect.

Thanks!

-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yu, DapengX
Sent: Friday, December 25, 2020 1:09 PM
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

Hi Stephen,

Do you mean this solution?
1. support atexit() in librte_eal, other component can use it to register a function to be called when rte_exit() is called.
2. in librte_cmdline, use atexit() to register a function to release resource 

I am looking forward to more comments from other maintainers, since this solution will modify librte_eal and librte_cmdline, but not just testpmd app.


-----Original Message-----
From: Stephen Hemminger [mailto:stephen@networkplumber.org]
Sent: Friday, December 25, 2020 11:03 AM
To: Yu, DapengX <dapengx.yu@intel.com>
Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

On Thu, 24 Dec 2020 11:57:48 +0800
dapengx.yu@intel.com wrote:

> From: YU DAPENG <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without 
> cmdline resource release, terminal will not echo keyboard input. So 
> add code to just show error message, but not exit testpmd when 
> unexpected happens on starting packet forwarding in interactive mode. User can type "quit"
> to exit testpmd later.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: YU DAPENG <dapengx.yu@intel.com>

Sounds like a more generic problem with rte_exit and librte_cmdline.
Would it better to fix it in librte_cmdline by adding an atexit() handler.

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Xing, Beilei]

> -----Original Message-----
> From: Yu, DapengX <dapengx.yu@intel.com>
> Sent: Friday, January 15, 2021 11:29 AM
> To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>
> Cc: Yu, DapengX <dapengx.yu@intel.com>; Stephen Hemminger
> <stephen@networkplumber.org>; dev@dpdk.org; stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource
> release
> 
> Hi Wenzhuo, Beilei, Bernard
> 
> I need testpmd app maintainers' comment :
>     Do you prefer the simple solution in this patch or Stephen's comprehensive
> and generic solution(which will modify librte_cmdline, testpmd (and maybe
> rte_exit()))?

The patch just workarounds a specific case, the issue exits in many cases, such as Rxonly mode and Rxq is 0.
So It's better to investigate how to solve the generic problem according to Stephen's comments.

> So I can continue resolving the defect.
> 
> Thanks!
> 
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yu, DapengX
> Sent: Friday, December 25, 2020 1:09 PM
> To: Stephen Hemminger <stephen@networkplumber.org>
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>;
> dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource
> release
> 
> Hi Stephen,
> 
> Do you mean this solution?
> 1. support atexit() in librte_eal, other component can use it to register a
> function to be called when rte_exit() is called.
> 2. in librte_cmdline, use atexit() to register a function to release resource
> 
> I am looking forward to more comments from other maintainers, since this
> solution will modify librte_eal and librte_cmdline, but not just testpmd app.
> 
> 
> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Friday, December 25, 2020 11:03 AM
> To: Yu, DapengX <dapengx.yu@intel.com>
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>;
> dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource
> release
> 
> On Thu, 24 Dec 2020 11:57:48 +0800
> dapengx.yu@intel.com wrote:
> 
> > From: YU DAPENG <dapengx.yu@intel.com>
> >
> > In interactive mode, if testpmd exit by calling rte_exit without
> > cmdline resource release, terminal will not echo keyboard input. So
> > add code to just show error message, but not exit testpmd when
> > unexpected happens on starting packet forwarding in interactive mode. User
> can type "quit"
> > to exit testpmd later.
> >
> > Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> > configuration")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
> 
> Sounds like a more generic problem with rte_exit and librte_cmdline.
> Would it better to fix it in librte_cmdline by adding an atexit() handler.
> 

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Yu, DapengX]

Hi Beilei,

Thanks for your comments, I will prepare patch v2.

-----Original Message-----
From: Xing, Beilei 
Sent: Friday, January 15, 2021 1:50 PM
To: Yu, DapengX <dapengx.yu@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>; dev@dpdk.org; stable@dpdk.org
Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

> -----Original Message-----
> From: Yu, DapengX <dapengx.yu@intel.com>
> Sent: Friday, January 15, 2021 11:29 AM
> To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> <beilei.xing@intel.com>; Iremonger, Bernard 
> <bernard.iremonger@intel.com>
> Cc: Yu, DapengX <dapengx.yu@intel.com>; Stephen Hemminger 
> <stephen@networkplumber.org>; dev@dpdk.org; stable@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> resource release
> 
> Hi Wenzhuo, Beilei, Bernard
> 
> I need testpmd app maintainers' comment :
>     Do you prefer the simple solution in this patch or Stephen's 
> comprehensive and generic solution(which will modify librte_cmdline, 
> testpmd (and maybe rte_exit()))?

The patch just workarounds a specific case, the issue exits in many cases, such as Rxonly mode and Rxq is 0.
So It's better to investigate how to solve the generic problem according to Stephen's comments.

> So I can continue resolving the defect.
> 
> Thanks!
> 
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yu, DapengX
> Sent: Friday, December 25, 2020 1:09 PM
> To: Stephen Hemminger <stephen@networkplumber.org>
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> <beilei.xing@intel.com>; Iremonger, Bernard 
> <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> resource release
> 
> Hi Stephen,
> 
> Do you mean this solution?
> 1. support atexit() in librte_eal, other component can use it to 
> register a function to be called when rte_exit() is called.
> 2. in librte_cmdline, use atexit() to register a function to release 
> resource
> 
> I am looking forward to more comments from other maintainers, since 
> this solution will modify librte_eal and librte_cmdline, but not just testpmd app.
> 
> 
> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Friday, December 25, 2020 11:03 AM
> To: Yu, DapengX <dapengx.yu@intel.com>
> Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> <beilei.xing@intel.com>; Iremonger, Bernard 
> <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> resource release
> 
> On Thu, 24 Dec 2020 11:57:48 +0800
> dapengx.yu@intel.com wrote:
> 
> > From: YU DAPENG <dapengx.yu@intel.com>
> >
> > In interactive mode, if testpmd exit by calling rte_exit without 
> > cmdline resource release, terminal will not echo keyboard input. So 
> > add code to just show error message, but not exit testpmd when 
> > unexpected happens on starting packet forwarding in interactive 
> > mode. User
> can type "quit"
> > to exit testpmd later.
> >
> > Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> > configuration")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
> 
> Sounds like a more generic problem with rte_exit and librte_cmdline.
> Would it better to fix it in librte_cmdline by adding an atexit() handler.
> 

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Li, Xiaoyun]

Hi
Actually, you can just type "stty echo" to solve the problem you met.

But anyway, if you want to fix it in DPDK
I think you misunderstood stephan's solution.
You don't need to implement atexit() yourself in eal. It's a common function like exit() in rte_exit().
Then when exit() is called. Each function registered by atexit() will be called in stack order.

The simplest way to solve this problem is to register a function with atexit() in prompt() in each app which uses cmdline.
Then when exit() in rte_exit() is called, the registered clean function will be called directly.

Registering in prompt() is because that prompt() is the function which starts cmdline in each app.

@Stephen Hemminger What do you think of this about atexit() in prompt() in each app?
I understand it's cmdline and rte_exit problem. But atexit needs a function without parameters.
And the cleanup for cmdline is cmdline_stdin_exit(struct cmdline *cl) which needs cmdline as the parameter to restore original terminal setting.
Setting a global value will be too ugly to me.

BRs
Xiaoyun

> -----Original Message-----
> From: stable <stable-bounces@dpdk.org> On Behalf Of Xing, Beilei
> Sent: Friday, January 15, 2021 13:50
> To: Yu, DapengX <dapengx.yu@intel.com>; Lu, Wenzhuo
> <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>
> Cc: Stephen Hemminger <stephen@networkplumber.org>; dev@dpdk.org;
> stable@dpdk.org
> Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without
> resource release
> 
> > -----Original Message-----
> > From: Yu, DapengX <dapengx.yu@intel.com>
> > Sent: Friday, January 15, 2021 11:29 AM
> > To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> > <beilei.xing@intel.com>; Iremonger, Bernard
> > <bernard.iremonger@intel.com>
> > Cc: Yu, DapengX <dapengx.yu@intel.com>; Stephen Hemminger
> > <stephen@networkplumber.org>; dev@dpdk.org; stable@dpdk.org
> > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without
> > resource release
> >
> > Hi Wenzhuo, Beilei, Bernard
> >
> > I need testpmd app maintainers' comment :
> >     Do you prefer the simple solution in this patch or Stephen's
> > comprehensive and generic solution(which will modify librte_cmdline,
> > testpmd (and maybe rte_exit()))?
> 
> The patch just workarounds a specific case, the issue exits in many cases, such
> as Rxonly mode and Rxq is 0.
> So It's better to investigate how to solve the generic problem according to
> Stephen's comments.
> 
> > So I can continue resolving the defect.
> >
> > Thanks!
> >
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yu, DapengX
> > Sent: Friday, December 25, 2020 1:09 PM
> > To: Stephen Hemminger <stephen@networkplumber.org>
> > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> > <beilei.xing@intel.com>; Iremonger, Bernard
> > <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without
> > resource release
> >
> > Hi Stephen,
> >
> > Do you mean this solution?
> > 1. support atexit() in librte_eal, other component can use it to
> > register a function to be called when rte_exit() is called.
> > 2. in librte_cmdline, use atexit() to register a function to release
> > resource
> >
> > I am looking forward to more comments from other maintainers, since
> > this solution will modify librte_eal and librte_cmdline, but not just testpmd app.
> >
> >
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Friday, December 25, 2020 11:03 AM
> > To: Yu, DapengX <dapengx.yu@intel.com>
> > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei
> > <beilei.xing@intel.com>; Iremonger, Bernard
> > <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without
> > resource release
> >
> > On Thu, 24 Dec 2020 11:57:48 +0800
> > dapengx.yu@intel.com wrote:
> >
> > > From: YU DAPENG <dapengx.yu@intel.com>
> > >
> > > In interactive mode, if testpmd exit by calling rte_exit without
> > > cmdline resource release, terminal will not echo keyboard input. So
> > > add code to just show error message, but not exit testpmd when
> > > unexpected happens on starting packet forwarding in interactive
> > > mode. User
> > can type "quit"
> > > to exit testpmd later.
> > >
> > > Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> > > configuration")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
> >
> > Sounds like a more generic problem with rte_exit and librte_cmdline.
> > Would it better to fix it in librte_cmdline by adding an atexit() handler.
> >

Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

[Yu, DapengX]

@Stephen Hemminger
Xiaoyun proposed a solution which may match your idea, but there are some concerns:
    1. a global variable for original terminal setting has to be defined.
    2. in each app which uses cmdline, a function has to be registered with atexit() in prompt() to restore original terminal setting.

@Stephen Hemminger, can you give some feedback on these concerns? Thanks!

-----Original Message-----
From: Li, Xiaoyun 
Sent: Friday, January 15, 2021 5:22 PM
To: Xing, Beilei <beilei.xing@intel.com>; Yu, DapengX <dapengx.yu@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org; stable@dpdk.org
Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without resource release

Hi
Actually, you can just type "stty echo" to solve the problem you met.

But anyway, if you want to fix it in DPDK I think you misunderstood stephan's solution.
You don't need to implement atexit() yourself in eal. It's a common function like exit() in rte_exit().
Then when exit() is called. Each function registered by atexit() will be called in stack order.

The simplest way to solve this problem is to register a function with atexit() in prompt() in each app which uses cmdline.
Then when exit() in rte_exit() is called, the registered clean function will be called directly.

Registering in prompt() is because that prompt() is the function which starts cmdline in each app.

@Stephen Hemminger What do you think of this about atexit() in prompt() in each app?
I understand it's cmdline and rte_exit problem. But atexit needs a function without parameters.
And the cleanup for cmdline is cmdline_stdin_exit(struct cmdline *cl) which needs cmdline as the parameter to restore original terminal setting.
Setting a global value will be too ugly to me.

BRs
Xiaoyun

> -----Original Message-----
> From: stable <stable-bounces@dpdk.org> On Behalf Of Xing, Beilei
> Sent: Friday, January 15, 2021 13:50
> To: Yu, DapengX <dapengx.yu@intel.com>; Lu, Wenzhuo 
> <wenzhuo.lu@intel.com>; Iremonger, Bernard 
> <bernard.iremonger@intel.com>
> Cc: Stephen Hemminger <stephen@networkplumber.org>; dev@dpdk.org; 
> stable@dpdk.org
> Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] app/testpmd: avoid exit 
> without resource release
> 
> > -----Original Message-----
> > From: Yu, DapengX <dapengx.yu@intel.com>
> > Sent: Friday, January 15, 2021 11:29 AM
> > To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> > <beilei.xing@intel.com>; Iremonger, Bernard 
> > <bernard.iremonger@intel.com>
> > Cc: Yu, DapengX <dapengx.yu@intel.com>; Stephen Hemminger 
> > <stephen@networkplumber.org>; dev@dpdk.org; stable@dpdk.org
> > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> > resource release
> >
> > Hi Wenzhuo, Beilei, Bernard
> >
> > I need testpmd app maintainers' comment :
> >     Do you prefer the simple solution in this patch or Stephen's 
> > comprehensive and generic solution(which will modify librte_cmdline, 
> > testpmd (and maybe rte_exit()))?
> 
> The patch just workarounds a specific case, the issue exits in many 
> cases, such as Rxonly mode and Rxq is 0.
> So It's better to investigate how to solve the generic problem 
> according to Stephen's comments.
> 
> > So I can continue resolving the defect.
> >
> > Thanks!
> >
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yu, DapengX
> > Sent: Friday, December 25, 2020 1:09 PM
> > To: Stephen Hemminger <stephen@networkplumber.org>
> > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> > <beilei.xing@intel.com>; Iremonger, Bernard 
> > <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> > resource release
> >
> > Hi Stephen,
> >
> > Do you mean this solution?
> > 1. support atexit() in librte_eal, other component can use it to 
> > register a function to be called when rte_exit() is called.
> > 2. in librte_cmdline, use atexit() to register a function to release 
> > resource
> >
> > I am looking forward to more comments from other maintainers, since 
> > this solution will modify librte_eal and librte_cmdline, but not just testpmd app.
> >
> >
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> > Sent: Friday, December 25, 2020 11:03 AM
> > To: Yu, DapengX <dapengx.yu@intel.com>
> > Cc: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Xing, Beilei 
> > <beilei.xing@intel.com>; Iremonger, Bernard 
> > <bernard.iremonger@intel.com>; dev@dpdk.org; stable@dpdk.org
> > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: avoid exit without 
> > resource release
> >
> > On Thu, 24 Dec 2020 11:57:48 +0800
> > dapengx.yu@intel.com wrote:
> >
> > > From: YU DAPENG <dapengx.yu@intel.com>
> > >
> > > In interactive mode, if testpmd exit by calling rte_exit without 
> > > cmdline resource release, terminal will not echo keyboard input. 
> > > So add code to just show error message, but not exit testpmd when 
> > > unexpected happens on starting packet forwarding in interactive 
> > > mode. User
> > can type "quit"
> > > to exit testpmd later.
> > >
> > > Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> > > configuration")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: YU DAPENG <dapengx.yu@intel.com>
> >
> > Sounds like a more generic problem with rte_exit and librte_cmdline.
> > Would it better to fix it in librte_cmdline by adding an atexit() handler.
> >

[dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[dapengx.yu]

From: Dapeng Yu <dapengx.yu@intel.com>

In interactive mode, if testpmd exit by calling rte_exit without
restore terminal attributes, terminal will not echo keyboard input.

register a function with atexit() in prompt(), when exit() in
rte_exit() is called, the registered function restores terminal
attributes.

Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional configuration")
Cc: stable@dpdk.org

Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
---
 app/test-pmd/cmdline.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 89034c8b7..f7e18ba3d 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -17116,6 +17116,7 @@ cmdline_read_from_file(const char *filename)
 void
 prompt(void)
 {
+	int ret;
 	/* initialize non-constant commands */
 	cmd_set_fwd_mode_init();
 	cmd_set_fwd_retry_mode_init();
@@ -17123,15 +17124,23 @@ prompt(void)
 	testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");
 	if (testpmd_cl == NULL)
 		return;
+
+	ret = atexit(prompt_exit);
+	if (ret != 0)
+		printf("Cannot set exit function for cmdline\n");
+
 	cmdline_interact(testpmd_cl);
-	cmdline_stdin_exit(testpmd_cl);
+	if (ret != 0)
+		cmdline_stdin_exit(testpmd_cl);
 }
 
 void
 prompt_exit(void)
 {
-	if (testpmd_cl != NULL)
+	if (testpmd_cl != NULL) {
 		cmdline_quit(testpmd_cl);
+		cmdline_stdin_exit(testpmd_cl);
+	}
 }
 
 static void
-- 
2.27.0

Re: [dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[Li, Xiaoyun]

Hi

> -----Original Message-----
> From: dapengx.yu@intel.com <dapengx.yu@intel.com>
> Sent: Monday, January 25, 2021 11:30
> To: Xing, Beilei <beilei.xing@intel.com>; Li, Xiaoyun <xiaoyun.li@intel.com>; Lu,
> Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard
> <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> From: Dapeng Yu <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without restore terminal
> attributes, terminal will not echo keyboard input.
> 
> register a function with atexit() in prompt(), when exit() in
> rte_exit() is called, the registered function restores terminal attributes.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> ---
>  app/test-pmd/cmdline.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index
> 89034c8b7..f7e18ba3d 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -17116,6 +17116,7 @@ cmdline_read_from_file(const char *filename)
> void
>  prompt(void)
>  {
> +	int ret;
>  	/* initialize non-constant commands */
>  	cmd_set_fwd_mode_init();
>  	cmd_set_fwd_retry_mode_init();
> @@ -17123,15 +17124,23 @@ prompt(void)
>  	testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");
>  	if (testpmd_cl == NULL)
>  		return;
> +
> +	ret = atexit(prompt_exit);
> +	if (ret != 0)
> +		printf("Cannot set exit function for cmdline\n");
> +
>  	cmdline_interact(testpmd_cl);
> -	cmdline_stdin_exit(testpmd_cl);
> +	if (ret != 0)

Why do you need to check ret here?
Even if registers prompt_exit failed, when users type "quit" and then break from cmdline_interact(), cmdline_stdin_exit() should be called to restore terminal settings.

> +		cmdline_stdin_exit(testpmd_cl);
>  }
> 
>  void
>  prompt_exit(void)
>  {
> -	if (testpmd_cl != NULL)
> +	if (testpmd_cl != NULL) {
>  		cmdline_quit(testpmd_cl);
> +		cmdline_stdin_exit(testpmd_cl);
> +	}
>  }
> 
>  static void
> --
> 2.27.0

Re: [dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[Yu, DapengX]

Hi Xiaoyun,

For this situation: registering prompt_exit succeed,  and user type "quit" command to exit testpmd.

If the second call to cmdline_stdin_exit is not excluded from the code conditionally, the cmdline_stdin_exit will be called twice;

1. the first time: in prompt()
    #0  cmdline_stdin_exit (cl=0x3638470) at ../lib/librte_cmdline/cmdline_socket.c:56
    #1  0x000000000051fb62 in prompt () at ../app/test-pmd/cmdline.c:17134
    #2  0x00000000005a4d0f in main (argc=2, argv=0x7fffffffda70) at ../app/test-pmd/testpmd.c:3849
2. the second time: in exit() .
    #0  cmdline_stdin_exit (cl=0x3638470) at ../lib/librte_cmdline/cmdline_socket.c:56
    #1  0x000000000051fb95 in prompt_exit () at ../app/test-pmd/cmdline.c:17142
    #2  0x00007ffff630fe9c in __run_exit_handlers () from /lib64/libc.so.6
    #3  0x00007ffff630ffd0 in exit () from /lib64/libc.so.6
    #4  0x00007ffff62f96aa in __libc_start_main () from /lib64/libc.so.6
    #5  0x00000000004ead2e in _start () 

-----Original Message-----
From: Li, Xiaoyun 
Sent: Tuesday, January 26, 2021 2:33 PM
To: Yu, DapengX <dapengx.yu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore

Hi

> -----Original Message-----
> From: dapengx.yu@intel.com <dapengx.yu@intel.com>
> Sent: Monday, January 25, 2021 11:30
> To: Xing, Beilei <beilei.xing@intel.com>; Li, Xiaoyun 
> <xiaoyun.li@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, 
> Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> From: Dapeng Yu <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without 
> restore terminal attributes, terminal will not echo keyboard input.
> 
> register a function with atexit() in prompt(), when exit() in
> rte_exit() is called, the registered function restores terminal attributes.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional 
> configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> ---
>  app/test-pmd/cmdline.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index 
> 89034c8b7..f7e18ba3d 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -17116,6 +17116,7 @@ cmdline_read_from_file(const char *filename) 
> void
>  prompt(void)
>  {
> +int ret;
>  /* initialize non-constant commands */  cmd_set_fwd_mode_init();  
> cmd_set_fwd_retry_mode_init(); @@ -17123,15 +17124,23 @@ prompt(void)  
> testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");  if (testpmd_cl 
> == NULL)  return;
> +
> +ret = atexit(prompt_exit);
> +if (ret != 0)
> +printf("Cannot set exit function for cmdline\n");
> +
>  cmdline_interact(testpmd_cl);
> -cmdline_stdin_exit(testpmd_cl);
> +if (ret != 0)

Why do you need to check ret here?
Even if registers prompt_exit failed, when users type "quit" and then break from cmdline_interact(), cmdline_stdin_exit() should be called to restore terminal settings.

> +cmdline_stdin_exit(testpmd_cl);
>  }
> 
>  void
>  prompt_exit(void)
>  {
> -if (testpmd_cl != NULL)
> +if (testpmd_cl != NULL) {
>  cmdline_quit(testpmd_cl);
> +cmdline_stdin_exit(testpmd_cl);
> +}
>  }
> 
>  static void
> --
> 2.27.0

Re: [dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[Yu, DapengX]

@Xiaoyun,
Add one more explanation.
even if registers prompt_exit failed, when users type "quit" and then break from cmdline_interact(), the ret check will not prevent cmdline_stdin_exit() to be called to restore terminal settings in this patch.

@Beilei
Can you give comment on this patch v2, so I can move on to resolve this issue related with this patch.

-----Original Message-----
From: Yu, DapengX 
Sent: Tuesday, January 26, 2021 3:13 PM
To: Li, Xiaoyun <xiaoyun.li@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
Cc: dev@dpdk.org; stable@dpdk.org
Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore

Hi Xiaoyun,

For this situation: registering prompt_exit succeed,  and user type "quit" command to exit testpmd.

If the second call to cmdline_stdin_exit is not excluded from the code conditionally, the cmdline_stdin_exit will be called twice;

1. the first time: in prompt()
    #0  cmdline_stdin_exit (cl=0x3638470) at ../lib/librte_cmdline/cmdline_socket.c:56
    #1  0x000000000051fb62 in prompt () at ../app/test-pmd/cmdline.c:17134
    #2  0x00000000005a4d0f in main (argc=2, argv=0x7fffffffda70) at ../app/test-pmd/testpmd.c:3849 2. the second time: in exit() .
    #0  cmdline_stdin_exit (cl=0x3638470) at ../lib/librte_cmdline/cmdline_socket.c:56
    #1  0x000000000051fb95 in prompt_exit () at ../app/test-pmd/cmdline.c:17142
    #2  0x00007ffff630fe9c in __run_exit_handlers () from /lib64/libc.so.6
    #3  0x00007ffff630ffd0 in exit () from /lib64/libc.so.6
    #4  0x00007ffff62f96aa in __libc_start_main () from /lib64/libc.so.6
    #5  0x00000000004ead2e in _start () 

-----Original Message-----
From: Li, Xiaoyun
Sent: Tuesday, January 26, 2021 2:33 PM
To: Yu, DapengX <dapengx.yu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore

Hi

> -----Original Message-----
> From: dapengx.yu@intel.com <dapengx.yu@intel.com>
> Sent: Monday, January 25, 2021 11:30
> To: Xing, Beilei <beilei.xing@intel.com>; Li, Xiaoyun 
> <xiaoyun.li@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, 
> Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> From: Dapeng Yu <dapengx.yu@intel.com>
> 
> In interactive mode, if testpmd exit by calling rte_exit without 
> restore terminal attributes, terminal will not echo keyboard input.
> 
> register a function with atexit() in prompt(), when exit() in
> rte_exit() is called, the registered function restores terminal attributes.
> 
> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> configuration")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> ---
>  app/test-pmd/cmdline.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index 
> 89034c8b7..f7e18ba3d 100644
> --- a/app/test-pmd/cmdline.c
> +++ b/app/test-pmd/cmdline.c
> @@ -17116,6 +17116,7 @@ cmdline_read_from_file(const char *filename) 
> void
>  prompt(void)
>  {
> +int ret;
>  /* initialize non-constant commands */  cmd_set_fwd_mode_init(); 
> cmd_set_fwd_retry_mode_init(); @@ -17123,15 +17124,23 @@ prompt(void) 
> testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");  if (testpmd_cl 
> == NULL)  return;
> +
> +ret = atexit(prompt_exit);
> +if (ret != 0)
> +printf("Cannot set exit function for cmdline\n");
> +
>  cmdline_interact(testpmd_cl);
> -cmdline_stdin_exit(testpmd_cl);
> +if (ret != 0)

Why do you need to check ret here?
Even if registers prompt_exit failed, when users type "quit" and then break from cmdline_interact(), cmdline_stdin_exit() should be called to restore terminal settings.

> +cmdline_stdin_exit(testpmd_cl);
>  }
> 
>  void
>  prompt_exit(void)
>  {
> -if (testpmd_cl != NULL)
> +if (testpmd_cl != NULL) {
>  cmdline_quit(testpmd_cl);
> +cmdline_stdin_exit(testpmd_cl);
> +}
>  }
> 
>  static void
> --
> 2.27.0

Re: [dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[Li, Xiaoyun]

Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>

> -----Original Message-----
> From: Yu, DapengX <dapengx.yu@intel.com>
> Sent: Tuesday, January 26, 2021 15:44
> To: Li, Xiaoyun <xiaoyun.li@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Lu,
> Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard
> <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> @Xiaoyun,
> Add one more explanation.
> even if registers prompt_exit failed, when users type "quit" and then break from
> cmdline_interact(), the ret check will not prevent cmdline_stdin_exit() to be
> called to restore terminal settings in this patch.
> 
> @Beilei
> Can you give comment on this patch v2, so I can move on to resolve this issue
> related with this patch.
> 
> -----Original Message-----
> From: Yu, DapengX
> Sent: Tuesday, January 26, 2021 3:13 PM
> To: Li, Xiaoyun <xiaoyun.li@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Lu,
> Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard
> <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> Hi Xiaoyun,
> 
> For this situation: registering prompt_exit succeed,  and user type "quit"
> command to exit testpmd.
> 
> If the second call to cmdline_stdin_exit is not excluded from the code
> conditionally, the cmdline_stdin_exit will be called twice;
> 
> 1. the first time: in prompt()
>     #0  cmdline_stdin_exit (cl=0x3638470)
> at ../lib/librte_cmdline/cmdline_socket.c:56
>     #1  0x000000000051fb62 in prompt () at ../app/test-pmd/cmdline.c:17134
>     #2  0x00000000005a4d0f in main (argc=2, argv=0x7fffffffda70) at ../app/test-
> pmd/testpmd.c:3849 2. the second time: in exit() .
>     #0  cmdline_stdin_exit (cl=0x3638470)
> at ../lib/librte_cmdline/cmdline_socket.c:56
>     #1  0x000000000051fb95 in prompt_exit () at ../app/test-
> pmd/cmdline.c:17142
>     #2  0x00007ffff630fe9c in __run_exit_handlers () from /lib64/libc.so.6
>     #3  0x00007ffff630ffd0 in exit () from /lib64/libc.so.6
>     #4  0x00007ffff62f96aa in __libc_start_main () from /lib64/libc.so.6
>     #5  0x00000000004ead2e in _start ()
> 
> -----Original Message-----
> From: Li, Xiaoyun
> Sent: Tuesday, January 26, 2021 2:33 PM
> To: Yu, DapengX <dapengx.yu@intel.com>; Xing, Beilei <beilei.xing@intel.com>;
> Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger, Bernard
> <bernard.iremonger@intel.com>; stephen@networkplumber.org
> Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> Subject: RE: [PATCH v2] app/testpmd: avoid exit without terminal restore
> 
> Hi
> 
> > -----Original Message-----
> > From: dapengx.yu@intel.com <dapengx.yu@intel.com>
> > Sent: Monday, January 25, 2021 11:30
> > To: Xing, Beilei <beilei.xing@intel.com>; Li, Xiaoyun
> > <xiaoyun.li@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>; Iremonger,
> > Bernard <bernard.iremonger@intel.com>; stephen@networkplumber.org
> > Cc: dev@dpdk.org; Yu, DapengX <dapengx.yu@intel.com>; stable@dpdk.org
> > Subject: [PATCH v2] app/testpmd: avoid exit without terminal restore
> >
> > From: Dapeng Yu <dapengx.yu@intel.com>
> >
> > In interactive mode, if testpmd exit by calling rte_exit without
> > restore terminal attributes, terminal will not echo keyboard input.
> >
> > register a function with atexit() in prompt(), when exit() in
> > rte_exit() is called, the registered function restores terminal attributes.
> >
> > Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
> > configuration")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> > ---
> >  app/test-pmd/cmdline.c | 13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c index
> > 89034c8b7..f7e18ba3d 100644
> > --- a/app/test-pmd/cmdline.c
> > +++ b/app/test-pmd/cmdline.c
> > @@ -17116,6 +17116,7 @@ cmdline_read_from_file(const char *filename)
> > void
> >  prompt(void)
> >  {
> > +int ret;
> >  /* initialize non-constant commands */  cmd_set_fwd_mode_init();
> > cmd_set_fwd_retry_mode_init(); @@ -17123,15 +17124,23 @@ prompt(void)
> > testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");  if (testpmd_cl
> > == NULL)  return;
> > +
> > +ret = atexit(prompt_exit);
> > +if (ret != 0)
> > +printf("Cannot set exit function for cmdline\n");
> > +
> >  cmdline_interact(testpmd_cl);
> > -cmdline_stdin_exit(testpmd_cl);
> > +if (ret != 0)
> 
> Why do you need to check ret here?
> Even if registers prompt_exit failed, when users type "quit" and then break from
> cmdline_interact(), cmdline_stdin_exit() should be called to restore terminal
> settings.
> 
> > +cmdline_stdin_exit(testpmd_cl);
> >  }
> >
> >  void
> >  prompt_exit(void)
> >  {
> > -if (testpmd_cl != NULL)
> > +if (testpmd_cl != NULL) {
> >  cmdline_quit(testpmd_cl);
> > +cmdline_stdin_exit(testpmd_cl);
> > +}
> >  }
> >
> >  static void
> > --
> > 2.27.0
> 
> 

Re: [dpdk-stable] [PATCH v2] app/testpmd: avoid exit without terminal restore

[Ferruh Yigit]

On 1/26/2021 8:24 AM, Li, Xiaoyun wrote:

<...>

>>>
>>> From: Dapeng Yu <dapengx.yu@intel.com>
>>>
>>> In interactive mode, if testpmd exit by calling rte_exit without
>>> restore terminal attributes, terminal will not echo keyboard input.
>>>
>>> register a function with atexit() in prompt(), when exit() in
>>> rte_exit() is called, the registered function restores terminal attributes.
>>>
>>> Fixes: 5a8fb55c48ab ("app/testpmd: support unidirectional
>>> configuration")
>>> Cc: stable@dpdk.org
>>>
>>> Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
 >
> Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>
> 
Applied to dpdk-next-net/main, thanks.