Re: [PATCH v3 1/2] net/i40e: queue region set and flush

["Chilikin, Andrey" <andrey.chilikin@intel.com>]

Hi Wei

> -----Original Message-----
> From: Zhao1, Wei
> Sent: Friday, September 22, 2017 9:49 AM
> To: Chilikin, Andrey <andrey.chilikin@intel.com>; dev@dpdk.org
> Cc: Yigit, Ferruh <ferruh.yigit@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>
> Subject: RE: [dpdk-dev] [PATCH v3 1/2] net/i40e: queue region set and flush
> 
> Hi，Andrey
> 
> > -----Original Message-----
> > From: Chilikin, Andrey
> > Sent: Friday, September 22, 2017 3:53 AM
> > To: Zhao1, Wei <wei.zhao1@intel.com>; dev@dpdk.org
> > Cc: Zhao1, Wei <wei.zhao1@intel.com>; Yigit, Ferruh
> > <ferruh.yigit@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing
> > <jingjing.wu@intel.com>
> > Subject: RE: [dpdk-dev] [PATCH v3 1/2] net/i40e: queue region set and
> flush

<snip>

> > > +	if (i == I40E_REGION_MAX_INDEX) {
> > > +		printf("The region sizes should be any of the following "
> > > +		"values: 1, 2, 4, 8, 16, 32, 64 as long as the "
> > > +		"total number of queues do not exceed the VSI allocation");

 printf?

> > > +		return ret;
> > > +	}
> > > +
> > > +	if (conf_ptr->region_id >= I40E_REGION_MAX_INDEX) {
> > > +		PMD_INIT_LOG(ERR, "the queue region max index is 7");
> > > +		return ret;
> > > +	}
> > > +

<snip>
> > > +	switch (op_type) {
> > > +	case RTE_PMD_I40E_QUEUE_REGION_SET:
> > > +		ret = i40e_set_queue_region(pf, conf_ptr);
> > > +		break;
> > > +	case RTE_PMD_I40E_REGION_FLOWTYPE_PF_SET:
> > > +		ret = i40e_set_region_flowtype_pf(hw, pf, conf_ptr);
> > > +		break;
> > > +	case RTE_PMD_I40E_REGION_FLOWTYPE_VF_SET:
> > > +		ret = -EINVAL;
> > > +		break;
> >
> > Why setting of flowtype mapping is separated to two different option?
> > Does it mean that application will need to detect which driver it uses before
> > calling this API? Application should not care which driver is in use, it tracks
> the
> > number of queues used for RSS and just configures these queues to
> > different regions, regardless if it runs on top of PF or VF. Difference in
> > configuration for PF/VF should be hidden from application, so only single
> > RTE_PMD_I40E_REGION_FLOWTYPE_SET should be used.
> 
> By now , we only support pf for this config.
> But I think what you said is very reasonable. I can change code to a new
> scheme:
> DPDK i40e driver use   rte_eth_dev ->device->name to detect  whether his
> name is
> " net_i40e_vf " or " net_i40e"  itself, then  we  can PMD driver decide to
> config PFQF_HREGION or VFQF_HREGION.
> I will make change in v4 later.
> 
> >
> > All other options do not have separate check.
> > Will they work on both PF and VF?
> 
> No, only WORK on PF. The reason we have talk in other mail before.
> 

Yes, it is why I was confused with separating RTE_PMD_I40E_REGION_FLOWTYPE to PF and VF. All options work on PF only, by only FLOWTYPE was split to PF/VF.

> >
> > > +	case RTE_PMD_I40E_UP_REGION_SET:
> > > +		ret = i40e_set_up_region(pf, conf_ptr);
> > > +		break;
> > > +	case RTE_PMD_I40E_REGION_ALL_FLUSH_ON:
> > > +		ret = i40e_flush_region_all_conf(hw, pf, 1);
> > > +		break;
> > > +	case RTE_PMD_I40E_REGION_ALL_FLUSH_OFF:
> > > +		ret = i40e_flush_region_all_conf(hw, pf, 0);
> > > +		break;
> > > +

Could you explain what is the difference between FLUSH_OFF and FLUSH_ON and how it can be used by an application?

> > > +	default:
> > > +		PMD_DRV_LOG(WARNING, "op type (%d) not supported",
> > > +			    op_type);
> > > +		ret = -EINVAL;
> > > +		break;
> > > +	}
> > > +
> > > +	I40E_WRITE_FLUSH(hw);
> > > +
> > > +	return ret;
> > > +}
> >
> 
> > How this API can be tested, is there a separate testpmd patch?
> 
> Yes, testpmd has add new CLI commands to support it, also can be use by
> customer.

Sorry, missed second part of the patchset.

Regards,
Andrey