Re: [dpdk-dev] [dpdk-stable] [PATCH] app/testpmd: fix offloads overwrite by default configuration

["Zhao1, Wei" <wei.zhao1@intel.com>]

Hi,  Ferruh

> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Tuesday, June 11, 2019 10:37 PM
> To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org; Peng, Yuan <yuan.peng@intel.com>; Lu, Wenzhuo
> <wenzhuo.lu@intel.com>; Kevin Traynor <ktraynor@redhat.com>
> Subject: Re: [dpdk-stable] [PATCH] app/testpmd: fix offloads overwrite by
> default configuration
> 
> On 5/9/2019 8:20 AM, Wei Zhao wrote:
> > There is an error in function rxtx_port_config(), which may overwrite
> > offloads configuration get from function launch_args_parse() when run
> > testpmd app. So rxtx_port_config() should do "or" for port offloads.
> >
> > Fixes: d44f8a485f5d ("app/testpmd: enable per queue configure")
> > cc: stable@dpdk.org
> >
> > Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
> > ---
> >  app/test-pmd/testpmd.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > 6fbfd29..f0061d9 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -2809,9 +2809,12 @@ static void
> >  rxtx_port_config(struct rte_port *port)  {
> >  	uint16_t qid;
> > +	uint64_t offloads;
> >
> >  	for (qid = 0; qid < nb_rxq; qid++) {
> > +		offloads = port->rx_conf[qid].offloads;
> >  		port->rx_conf[qid] = port->dev_info.default_rxconf;
> > +		port->rx_conf[qid].offloads |= offloads;
> 
> While talking with Kevin, he pointed out the error in this code.
> 
> We are updating queue level offloads, with whatever in the 'offloads' and it can
> be non-queue level offloads in it, next time ethdev API called these values are
> caught by the API checks and causing an error.
> 
> It looks like port level offload flags needs to be masted out before writing to
> queue level 'offloads' variable.

By now, the default offloads value of i40e and ixgbe is 0, so it do not cause error when set port offloads to queue.
But if it is not 0, maybe that will happen as you said.
  
> 
> >
> >  		/* Check if any Rx parameters have been passed */
> >  		if (rx_pthresh != RTE_PMD_PARAM_UNSET) @@ -2833,7
> +2836,9 @@
> > rxtx_port_config(struct rte_port *port)
> >  	}
> >
> >  	for (qid = 0; qid < nb_txq; qid++) {
> > +		offloads = port->tx_conf[qid].offloads;
> >  		port->tx_conf[qid] = port->dev_info.default_txconf;
> > +		port->tx_conf[qid].offloads |= offloads;
> >
> >  		/* Check if any Tx parameters have been passed */
> >  		if (tx_pthresh != RTE_PMD_PARAM_UNSET)
> >