[dpdk-stable] [PATCH] app/testpmd: fix Segment fault when start fwd

[Wang, ShougangX]

Hi Ferruh

Thanks for your reply.

> Not sure if 'reset' command should do more than it says, if there is a
> requirement that port should be stopped, why not add this condition with an
> error message so that user can stop the port in advance if she wants.

Firstly, port must be stopped before reset. Usually, port is stopped by rte_eth_dev_reset(), 
so testpmd does not prompt user to stop port. Although it can stop port, but testpmd does not 
change its own port status flag to "RTE_PORT_STOPPED" and it will cause "port start" to fail. 
So I add this patch to stop port as same as running "port stop" command.

> - 'reset_port()' function has a loop inside, 'RTE_ETH_FOREACH_DEV()' but it
> works on single port, the loop looked unnecessary to me, can you please check
> and remove the loop if required?

"port reset" supports reset all ports (testpmd > port reset all), so this loop is necessary.

> - I am not able to see 'reset' has been documented in
> 'doc/guides/testpmd_app_ug/testpmd_funcs.rst', it may be missing, can you
> please check and add it if required?

OK. I will add it in the next patch.

Thanks.
Shougang


> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Saturday, September 14, 2019 1:35 AM
> To: Wang, ShougangX <shougangx.wang at intel.com>; dev at dpdk.org
> Cc: Lu, Wenzhuo <wenzhuo.lu at intel.com>; Yang, Qiming
> <qiming.yang at intel.com>; stable at dpdk.org
> Subject: Re: [dpdk-stable] [PATCH] app/testpmd: fix Segment fault when start
> fwd
> 
> On 9/6/2019 2:28 AM, Wang ShougangX wrote:
> > This patch fixed the reset function to avoid crash when user don't
> > call port reset , port stop and port start functions as sequence.
> >
> > Fixes: 97f1e19679 ("app/testpmd: add port reset command")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Wang ShougangX <shougangx.wang at intel.com>
> > ---
> >  app/test-pmd/testpmd.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > e8e2a39b6..273a7aa02 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -2344,6 +2344,9 @@ reset_port(portid_t pid)
> >  	if (port_id_is_invalid(pid, ENABLED_WARN))
> >  		return;
> >
> > +	printf("Stopping ports...\n");
> > +	stop_port(pid);
> > +
> >  	printf("Resetting ports...\n");
> >
> >  	RTE_ETH_FOREACH_DEV(pi) {
> > @@ -2372,6 +2375,9 @@ reset_port(portid_t pid)
> >  		}
> >  	}
> >
> > +	printf("Starting ports...\n");
> > +	start_port(pid);
> > +
> >  	printf("Done\n");
> >  }
> 
> Hi Shougang,
> 
> Not sure if 'reset' command should do more than it says, if there is a
> requirement that port should be stopped, why not add this condition with an
> error message so that user can stop the port in advance if she wants.
> 
> 
> Btw, a few things related,
> - 'reset_port()' function has a loop inside, 'RTE_ETH_FOREACH_DEV()' but it
> works on single port, the loop looked unnecessary to me, can you please check
> and remove the loop if required?
> 
> - I am not able to see 'reset' has been documented in
> 'doc/guides/testpmd_app_ug/testpmd_funcs.rst', it may be missing, can you
> please check and add it if required?
> 
> Thanks,
> ferruh