Re: [dpdk-dev] [PATCH] net/ice: fix representor port segmentation fault

["Wang, Haiyue" <haiyue.wang@intel.com>]

> -----Original Message-----
> From: Yu, DapengX <dapengx.yu@intel.com>
> Sent: Friday, September 3, 2021 11:09
> To: Wang, Haiyue <haiyue.wang@intel.com>; Yang, Qiming <qiming.yang@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>
> Cc: dev@dpdk.org; stable@dpdk.org
> Subject: RE: [PATCH] net/ice: fix representor port segmentation fault
> 
> 
> 
> > -----Original Message-----
> > From: Wang, Haiyue <haiyue.wang@intel.com>
> > Sent: Thursday, September 2, 2021 10:45 PM
> > To: Yu, DapengX <dapengx.yu@intel.com>; Yang, Qiming
> > <qiming.yang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>
> > Cc: dev@dpdk.org; stable@dpdk.org
> > Subject: RE: [PATCH] net/ice: fix representor port segmentation fault
> >
> > > -----Original Message-----
> > > From: Yu, DapengX <dapengx.yu@intel.com>
> > > Sent: Thursday, September 2, 2021 17:44
> > > To: Yang, Qiming <qiming.yang@intel.com>; Zhang, Qi Z
> > > <qi.z.zhang@intel.com>
> > > Cc: dev@dpdk.org; Wang, Haiyue <haiyue.wang@intel.com>; Yu, DapengX
> > > <dapengx.yu@intel.com>; stable@dpdk.org
> > > Subject: [PATCH] net/ice: fix representor port segmentation fault
> > >
> > > From: Dapeng Yu <dapengx.yu@intel.com>
> > >
> > > If DCF representor port is closed after DCF port is closed, there will
> > > be segmentation fault because representor accesses the released
> > > resource of DCF port.
> > >
> > > This patch makes DCF representor port is always closed before DCF port
> > > is closed.
> > >
> > > Fixes: 5674465a32c8 ("net/ice: add DCF VLAN handling")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
> > > ---
> > >  drivers/net/ice/ice_dcf_ethdev.c         |  1 +
> > >  drivers/net/ice/ice_dcf_ethdev.h         |  1 +
> > >  drivers/net/ice/ice_dcf_vf_representor.c | 26
> > > ++++++++++++++++++++----
> > >  3 files changed, 24 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/net/ice/ice_dcf_ethdev.c
> > > b/drivers/net/ice/ice_dcf_ethdev.c
> > > index cab7c4da87..b837f69fd4 100644
> > > --- a/drivers/net/ice/ice_dcf_ethdev.c
> > > +++ b/drivers/net/ice/ice_dcf_ethdev.c
> > > @@ -874,6 +874,7 @@ ice_dcf_dev_close(struct rte_eth_dev *dev)
> > >  	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> > >  		return 0;
> > >
> > > +	ice_dcf_vf_repr_close_all(adapter);
> > >  	ice_dcf_free_repr_info(adapter);
> > >  	ice_dcf_uninit_parent_adapter(dev);
> > >  	ice_dcf_uninit_hw(dev, &adapter->real_hw); diff --git
> > > a/drivers/net/ice/ice_dcf_ethdev.h b/drivers/net/ice/ice_dcf_ethdev.h
> > > index 8510e37119..9e8d3ef0c5 100644
> > > --- a/drivers/net/ice/ice_dcf_ethdev.h
> > > +++ b/drivers/net/ice/ice_dcf_ethdev.h
> > > @@ -64,5 +64,6 @@ int ice_dcf_vf_repr_init(struct rte_eth_dev
> > > *vf_rep_eth_dev, void *init_param);  int ice_dcf_vf_repr_uninit(struct
> > > rte_eth_dev *vf_rep_eth_dev);  int ice_dcf_vf_repr_init_vlan(struct
> > > rte_eth_dev *vf_rep_eth_dev);  void ice_dcf_vf_repr_stop_all(struct
> > > ice_dcf_adapter *dcf_adapter);
> > > +void ice_dcf_vf_repr_close_all(struct ice_dcf_adapter *dcf_adapter);
> > >
> > >  #endif /* _ICE_DCF_ETHDEV_H_ */
> > > diff --git a/drivers/net/ice/ice_dcf_vf_representor.c
> > > b/drivers/net/ice/ice_dcf_vf_representor.c
> > > index 970461f3e9..121dea7483 100644
> > > --- a/drivers/net/ice/ice_dcf_vf_representor.c
> > > +++ b/drivers/net/ice/ice_dcf_vf_representor.c
> > > @@ -46,6 +46,7 @@ static int
> > >  ice_dcf_vf_repr_dev_stop(struct rte_eth_dev *dev)  {
> > >  	dev->data->dev_link.link_status = ETH_LINK_DOWN;
> > > +	dev->data->dev_started = 0;
> > >
> > >  	return 0;
> > >  }
> > > @@ -53,6 +54,7 @@ ice_dcf_vf_repr_dev_stop(struct rte_eth_dev *dev)
> > > static int  ice_dcf_vf_repr_dev_close(struct rte_eth_dev *dev)  {
> > > +	(void)ice_dcf_vf_repr_dev_stop(dev);
> >
> > Do we truly need the "(void)" ?
> 
> Here use (void) to make discarding of return value explicit.

No need so paranoid ;-)

> There will be no compiler(clang, icc, and gcc) warning even if remove (void)
> So it is fine without that.

Then code is clean.

> > > --
> > > 2.27.0