Re: [PATCH v2 15/17] net/i40e: add flow flush function

["Xing, Beilei" <beilei.xing@intel.com>]

> -----Original Message-----
> From: Bie, Tiwei
> Sent: Wednesday, December 28, 2016 1:36 PM
> To: Xing, Beilei <beilei.xing@intel.com>
> Cc: Wu, Jingjing <jingjing.wu@intel.com>; Zhang, Helin
> <helin.zhang@intel.com>; dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v2 15/17] net/i40e: add flow flush function
> 
> On Tue, Dec 27, 2016 at 02:26:22PM +0800, Beilei Xing wrote:
> > This patch adds i40e_flow_flush function to flush all filters for
> > users. And flow director flush function is involved first.
> >
> > Signed-off-by: Beilei Xing <beilei.xing@intel.com>
> > ---
> >  drivers/net/i40e/i40e_ethdev.h |  3 +++
> >  drivers/net/i40e/i40e_fdir.c   |  8 ++------
> >  drivers/net/i40e/i40e_flow.c   | 46
> ++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 51 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/net/i40e/i40e_ethdev.h
> > b/drivers/net/i40e/i40e_ethdev.h index b8c7d41..0b736d5 100644
> > --- a/drivers/net/i40e/i40e_ethdev.h
> > +++ b/drivers/net/i40e/i40e_ethdev.h
> > @@ -786,6 +786,9 @@ i40e_sw_tunnel_filter_lookup(struct
> i40e_tunnel_rule *tunnel_rule,
> >  			     const struct i40e_tunnel_filter_input *input);  int
> > i40e_sw_tunnel_filter_del(struct i40e_pf *pf,
> >  			      struct i40e_tunnel_filter *tunnel_filter);
> > +int i40e_sw_fdir_filter_del(struct i40e_pf *pf,
> > +			    struct i40e_fdir_filter *filter); int
> i40e_fdir_flush(struct
> > +rte_eth_dev *dev);
> >
> 
> Why don't declare them as the global functions at the beginning?
When I implement the store/restore function, I plan this function is only used in i40e_ethdev.c.
I change them to the global functions since I add i40e_flow.c to rework all  the flow ops.

> 
> >  /* I40E_DEV_PRIVATE_TO */
> >  #define I40E_DEV_PRIVATE_TO_PF(adapter) \ diff --git
> > a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c index
> > 6c1bb18..f10aeee 100644
> > --- a/drivers/net/i40e/i40e_fdir.c
> > +++ b/drivers/net/i40e/i40e_fdir.c
> > @@ -119,8 +119,6 @@ static int i40e_fdir_filter_programming(struct
> i40e_pf *pf,
> >  			enum i40e_filter_pctype pctype,
> >  			const struct rte_eth_fdir_filter *filter,
> >  			bool add);
> > -static int i40e_fdir_flush(struct rte_eth_dev *dev);
> > -
> >  static int i40e_fdir_filter_convert(const struct rte_eth_fdir_filter *input,
> >  			 struct i40e_fdir_filter *filter);  static struct
> i40e_fdir_filter
> > * @@ -128,8 +126,6 @@ i40e_sw_fdir_filter_lookup(struct i40e_fdir_info
> > *fdir_info,
> >  			const struct rte_eth_fdir_input *input);  static int
> > i40e_sw_fdir_filter_insert(struct i40e_pf *pf,
> >  				   struct i40e_fdir_filter *filter); -static int
> > i40e_sw_fdir_filter_del(struct i40e_pf *pf,
> > -				struct i40e_fdir_filter *filter);
> >
> >  static int
> >  i40e_fdir_rx_queue_init(struct i40e_rx_queue *rxq) @@ -1070,7 +1066,7
> > @@ i40e_sw_fdir_filter_insert(struct i40e_pf *pf, struct
> > i40e_fdir_filter *filter)  }
> >
> >  /* Delete a flow director filter from the SW list */ -static int
> > +int
> >  i40e_sw_fdir_filter_del(struct i40e_pf *pf, struct i40e_fdir_filter
> > *filter)  {
> >  	struct i40e_fdir_info *fdir_info = &pf->fdir; @@ -1318,7 +1314,7 @@
> > i40e_fdir_filter_programming(struct i40e_pf *pf,
> >   * i40e_fdir_flush - clear all filters of Flow Director table
> >   * @pf: board private structure
> >   */
> > -static int
> > +int
> >  i40e_fdir_flush(struct rte_eth_dev *dev)  {
> >  	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> >dev_private);
> > diff --git a/drivers/net/i40e/i40e_flow.c
> > b/drivers/net/i40e/i40e_flow.c index 4c7856c..1d9f603 100644
> > --- a/drivers/net/i40e/i40e_flow.c
> > +++ b/drivers/net/i40e/i40e_flow.c
> > @@ -68,6 +68,8 @@ static struct rte_flow *i40e_flow_create(struct
> rte_eth_dev *dev,
> >  					 const struct rte_flow_item pattern[],
> >  					 const struct rte_flow_action
> actions[],
> >  					 struct rte_flow_error *error);
> > +static int i40e_flow_flush(struct rte_eth_dev *dev,
> > +			   struct rte_flow_error *error);
> >  static int i40e_flow_destroy(struct rte_eth_dev *dev,
> >  			     struct rte_flow *flow,
> >  			     struct rte_flow_error *error); @@ -95,11 +97,13
> @@ static int
> > i40e_dev_destroy_ethertype_filter(struct i40e_pf *pf,
> >  				     struct i40e_ethertype_filter *filter);  static
> int
> > i40e_dev_destroy_tunnel_filter(struct i40e_pf *pf,
> >  					  struct i40e_tunnel_filter *filter);
> > +static int i40e_fdir_filter_flush(struct i40e_pf *pf);
> >
> >  const struct rte_flow_ops i40e_flow_ops = {
> >  	.validate = i40e_flow_validate,
> >  	.create = i40e_flow_create,
> >  	.destroy = i40e_flow_destroy,
> > +	.flush = i40e_flow_flush,
> >  };
> >
> >  enum rte_filter_type cons_filter_type = RTE_ETH_FILTER_NONE; @@
> > -1603,3 +1607,45 @@ i40e_dev_destroy_tunnel_filter(struct i40e_pf *pf,
> >
> >  	return ret;
> >  }
> > +
> > +static int
> > +i40e_flow_flush(struct rte_eth_dev *dev, struct rte_flow_error
> > +*error) {
> > +	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> >dev_private);
> > +	int ret = 0;
> > +
> 
> Meaningless initialization.
Yes,  you're right, will change in next version. Thanks.

> 
> > +	ret = i40e_fdir_filter_flush(pf);
> > +	if (!ret)
> > +		rte_flow_error_set(error, EINVAL,
> > +				   RTE_FLOW_ERROR_TYPE_HANDLE, NULL,
> > +				   "Failed to flush FDIR flows.");
> 
> Just curious. What's the relationship between `ret' and the code (EINVAL)
> passed to rte_flow_error_set()? Is `-ret' acceptable as the parameter?
> Because the `-ret' which is actually returned by i40e_fdir_flush() is also some
> standard UNIX errno. When error occurs, user should use which one to figure
> out the failure reason? `-ret' or `rte_errno'?

rte_errno.  I need to rework all rte_flow_error_set() according to Adrien's comments.

> 
> > +
> > +	return ret;
> > +}
> > +
> > +static int
> > +i40e_fdir_filter_flush(struct i40e_pf *pf) {
> > +	struct rte_eth_dev *dev = pf->adapter->eth_dev;
> > +	struct i40e_fdir_info *fdir_info = &pf->fdir;
> > +	struct i40e_fdir_filter *fdir_filter;
> > +	struct i40e_flow *flow;
> > +	int ret = 0;
> > +
> 
> Meaningless initialization.
> 
> > +	ret = i40e_fdir_flush(dev);
> > +	if (!ret) {
> > +		/* Delete FDIR filters in FDIR list. */
> > +		while ((fdir_filter = TAILQ_FIRST(&fdir_info->fdir_list)))
> > +			i40e_sw_fdir_filter_del(pf, fdir_filter);
> > +
> 
> The i40e_sw_fdir_filter_del() may fail, in which case fdir_filter won't be
> removed from fdir_info->fdir_list. Will it lead to an infinite loop?
> Should you check the retval of i40e_sw_fdir_filter_del() and break the loop
> when it fails?

Yes, thanks for catching this.

> 
> Best regards,
> Tiwei Bie