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

["Yu, DapengX" <dapengx.yu@intel.com>]

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

> 
> >  	return ice_dcf_vf_repr_uninit(dev);
> >  }
> >
> > @@ -464,7 +466,6 @@ void
> >  ice_dcf_vf_repr_stop_all(struct ice_dcf_adapter *dcf_adapter)  {
> >  	uint16_t vf_id;
> > -	int ret;
> >
> >  	if (!dcf_adapter->repr_infos)
> >  		return;
> > @@ -475,8 +476,25 @@ ice_dcf_vf_repr_stop_all(struct ice_dcf_adapter
> *dcf_adapter)
> >  		if (!vf_rep_eth_dev || vf_rep_eth_dev->data->dev_started
> == 0)
> >  			continue;
> >
> > -		ret = ice_dcf_vf_repr_dev_stop(vf_rep_eth_dev);
> > -		if (!ret)
> > -			vf_rep_eth_dev->data->dev_started = 0;
> > +		(void)ice_dcf_vf_repr_dev_stop(vf_rep_eth_dev);
> > +	}
> > +}
> > +
> > +void
> > +ice_dcf_vf_repr_close_all(struct ice_dcf_adapter *dcf_adapter) {
> > +	uint16_t vf_id;
> > +
> > +	if (!dcf_adapter->repr_infos)
> > +		return;
> > +
> > +	for (vf_id = 0; vf_id < dcf_adapter->real_hw.num_vfs; vf_id++) {
> > +		struct rte_eth_dev *vf_rep_eth_dev =
> > +				dcf_adapter-
> >repr_infos[vf_id].vf_rep_eth_dev;
> > +		if (!vf_rep_eth_dev)
> > +			continue;
> > +
> > +		(void)ice_dcf_vf_repr_dev_close(vf_rep_eth_dev);
> > +		(void)rte_eth_dev_release_port(vf_rep_eth_dev);
> >  	}
> >  }
> > --
> > 2.27.0