[dpdk-dev] [PATCH v6 2/2] app/testpmd: fix port stop

[Iremonger, Bernard]

Hi Jingjing

> -----Original Message-----
> From: Wu, Jingjing
> Sent: Friday, February 3, 2017 8:22 AM
> To: Iremonger, Bernard <bernard.iremonger at intel.com>; dev at dpdk.org
> Cc: stable at dpdk.org
> Subject: RE: [PATCH v6 2/2] app/testpmd: fix port stop
> 
> 
> 
> > -----Original Message-----
> > From: Iremonger, Bernard
> > Sent: Friday, January 27, 2017 6:50 PM
> > To: dev at dpdk.org; Wu, Jingjing <jingjing.wu at intel.com>
> > Cc: Iremonger, Bernard <bernard.iremonger at intel.com>;
> stable at dpdk.org
> > Subject: [PATCH v6 2/2] app/testpmd: fix port stop
> >
> > The rte_eth_dev_stop function is not called if the port_status is not
> > RTE_PORT_STARTED. This can happen if the rte_eth_dev_start function is
> > called directly, ie not through the start_port function.
> >
> > Make sure rte_eth_dev_stop is always called in stop_port function.
> >
> > Fixes: ce8d561418d4 ("app/testpmd: add port configuration settings")
> >
> > CC: stable at dpdk.org
> > Signed-off-by: Bernard Iremonger <bernard.iremonger at intel.com>
> > ---
> >  app/test-pmd/testpmd.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > 3d25436..0d7a4d4 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -1490,13 +1490,13 @@ stop_port(portid_t pid)
> >  			continue;
> >  		}
> >
> > +		rte_eth_dev_stop(pi);
> > +
> >  		port = &ports[pi];
> >  		if (rte_atomic16_cmpset(&(port->port_status),
> > RTE_PORT_STARTED,
> >  						RTE_PORT_HANDLING) == 0)
> >  			continue;
> >
> > -		rte_eth_dev_stop(pi);
> > -
> 
> I don't think this fix is correct to move rte_eth_dev_stop above.
> 
> We need to make sure rte_eth_dev_start is called in start_port. For vmdq
> configuration, You just need to change the configuration when port is
> stopped.

I think the stop_port() function should always stop the port even if the port_status is not correct for any reason.
At present stop_port() returns without stopping the port if the port_status is not RTE_PORT_STARTED.

The VMDq configuration is done whet the port is stopped, however to the complete the VMDq configuration the port must be started.

Regards,

Bernard.