[dpdk-stable] [PATCH v2] app/testpmd: fix testpmd doesn't show RSS hash offload

[Li, Xiaoyun]

Hi

> -----Original Message-----
> From: stable <stable-bounces at dpdk.org> On Behalf Of Li, Xiaoyun
> Sent: Thursday, July 15, 2021 10:30
> To: Wang, Jie1X <jie1x.wang at intel.com>; dev at dpdk.org
> Cc: andrew.rybchenko at oktetlabs.ru; stable at dpdk.org
> Subject: Re: [dpdk-stable] [PATCH v2] app/testpmd: fix testpmd doesn't show
> RSS hash offload
> 
> Hi
> 
> > -----Original Message-----
> > From: Wang, Jie1X <jie1x.wang at intel.com>
> > Sent: Wednesday, July 14, 2021 01:04
> > To: dev at dpdk.org
> > Cc: Li, Xiaoyun <xiaoyun.li at intel.com>; andrew.rybchenko at oktetlabs.ru;
> > Wang, Jie1X <jie1x.wang at intel.com>; stable at dpdk.org
> > Subject: [PATCH v2] app/testpmd: fix testpmd doesn't show RSS hash
> > offload
> >
> > This patch reapply Rx/Tx offloads configuration for all ports after
> > the program configuring the device port. When the program configures
> > the ports, the default Rx/Tx offloads are modified in
> > dev->data->dev_conf.
> >
> > So it is need to reapply Rx/Tx offloads configuration after dev_configure.

Forgot to mention. The commit log has many grammar mistakes especially time tense.
You can use the following:
The driver may change offloads info into dev->data->dev_conf in dev_configure which may cause port->dev_conf and port->rx_conf contain outdated values.
This patch updates the offloads info if it changes to fix this issue.

> >
> > Fixes: ce8d561418d4 ("app/testpmd: add port configuration settings")
> > Cc: stable at dpdk.org
> >
> > Signed-off-by: Jie Wang <jie1x.wang at intel.com>
> > ---
> > v2: copy "rx/txmode.offloads", instead of copying the entire struct
> > "dev->data-
> > >dev_conf.rx/txmode".
> > ---
> >  app/test-pmd/testpmd.c | 19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >
> > diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index
> > 1cdd3cdd12..dc9ce5330b 100644
> > --- a/app/test-pmd/testpmd.c
> > +++ b/app/test-pmd/testpmd.c
> > @@ -2475,6 +2475,11 @@ start_port(portid_t pid)
> >  		}
> >
> >  		if (port->need_reconfig > 0) {
> > +			const struct rte_eth_dev *dev = &rte_eth_devices[pi];
> > +			struct rte_eth_conf *dev_conf;
> > +			int k;
> > +
> > +			dev_conf = &dev->data->dev_conf;
> >  			port->need_reconfig = 0;
> >
> >  			if (flow_isolate_all) {
> > @@ -2508,6 +2513,20 @@ start_port(portid_t pid)
> >  				port->need_reconfig = 1;
> >  				return -1;
> >  			}
> > +			/* Apply Rx offloads configuration */
> > +			for (k = 0; k < port->dev_info.max_rx_queues; k++) {
> > +				if (port->rx_conf[k].offloads !=
> > +					dev_conf->rxmode.offloads)
> > +					port->rx_conf[k].offloads =
> > +						dev_conf->rxmode.offloads;
> > +			}
> 
> I was suggesting something like:
> 	if (dev_conf->rxmode.offloads != port->dev_conf->rxmode.offloads) {
> 		port->dev_conf->rxmode.offloads = dev_conf-
> >rxmode.offloads;
> 		for (queues)
> 			update offloads for each queue of this port
> 	}
> 
> Not only check and change queue offload.
> 
> > +			/* Apply Tx offloads configuration */
> > +			for (k = 0; k < port->dev_info.max_tx_queues; k++) {
> > +				if (port->tx_conf[k].offloads !=
> > +					dev_conf->txmode.offloads)
> > +					port->tx_conf[k].offloads =
> > +						dev_conf->txmode.offloads;
> > +			}
> >  		}
> >  		if (port->need_reconfig_queues > 0) {
> >  			port->need_reconfig_queues = 0;
> > --
> > 2.25.1