[dpdk-stable] [PATCH v4] app/testpmd: fix testpmd doesn't show RSS hash offload

[Li, Xiaoyun]

> -----Original Message-----
> From: stable <stable-bounces at dpdk.org> On Behalf Of Li, Xiaoyun
> Sent: Thursday, July 15, 2021 12:54
> 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 v4] app/testpmd: fix testpmd doesn't show
> RSS hash offload
> 
> > -----Original Message-----
> > From: Wang, Jie1X <jie1x.wang at intel.com>
> > Sent: Thursday, July 15, 2021 19:57
> > 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 v4] app/testpmd: fix testpmd doesn't show RSS hash
> > offload
> >
> > 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 outdated values.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>
> > ---
> > v4: delete the whitespace at the end of the line.
> > v3:
> >  - check and update the "offloads" of "port->dev_conf.rx/txmode".
> >  - update the commit log.
> > v2: copy "rx/txmode.offloads", instead of copying the entire struct
> > "dev->data-
> > >dev_conf.rx/txmode".
> > ---
> >  app/test-pmd/testpmd.c | 27 +++++++++++++++++++++++++++
> >  1 file changed, 27 insertions(+)
> 
> Acked-by: Xiaoyun Li <xiaoyun.li at intel.com>

Although I gave my ack, app shouldn't touch rte_eth_devices which this patch does. Usually, testpmd should only call function like eth_dev_info_get_print_err().
But dev_info doesn't contain the info dev->data->dev_conf which the driver modifies.

Probably we need a better fix.