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: 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)" ?

>  	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