[PATCH v2] net/ice: optimize max queue number calculation

[Zhang, Qi Z]

> -----Original Message-----
> From: Wu, Wenjun1 <wenjun1.wu at intel.com>
> Sent: Tuesday, April 26, 2022 9:14 PM
> To: Zhang, Qi Z <qi.z.zhang at intel.com>; Yang, Qiming <qiming.yang at intel.com>
> Cc: dev at dpdk.org
> Subject: RE: [PATCH v2] net/ice: optimize max queue number calculation
> 
> 
> 
> > -----Original Message-----
> > From: Zhang, Qi Z <qi.z.zhang at intel.com>
> > Sent: Friday, April 8, 2022 7:24 PM
> > To: Yang, Qiming <qiming.yang at intel.com>; Wu, Wenjun1
> > <wenjun1.wu at intel.com>
> > Cc: dev at dpdk.org; Zhang, Qi Z <qi.z.zhang at intel.com>
> > Subject: [PATCH v2] net/ice: optimize max queue number calculation
> >
> > Remove the limitation that max queue pair number must be 2^n.
> > With this patch, even on a 8 ports device, the max queue pair number
> > increased from 128 to 254.
> >
> > Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
> > ---
> >
> > v2:
> > - fix check patch warning
> >
> >  drivers/net/ice/ice_ethdev.c | 24 ++++++++++++++++++++----
> >  1 file changed, 20 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/ice/ice_ethdev.c
> > b/drivers/net/ice/ice_ethdev.c index
> > 73e550f5fb..ff2b3e45d9 100644
> > --- a/drivers/net/ice/ice_ethdev.c
> > +++ b/drivers/net/ice/ice_ethdev.c
> > @@ -819,10 +819,26 @@ ice_vsi_config_tc_queue_mapping(struct ice_vsi
> > *vsi,
> >  		return -ENOTSUP;
> >  	}
> >
> > -	vsi->nb_qps = RTE_MIN(vsi->nb_qps, ICE_MAX_Q_PER_TC);
> > -	fls = (vsi->nb_qps == 0) ? 0 : rte_fls_u32(vsi->nb_qps) - 1;
> > -	/* Adjust the queue number to actual queues that can be applied */
> > -	vsi->nb_qps = (vsi->nb_qps == 0) ? 0 : 0x1 << fls;
> > +	/* vector 0 is reserved and 1 vector for ctrl vsi */
> > +	if (vsi->adapter->hw.func_caps.common_cap.num_msix_vectors < 2)
> > +		vsi->nb_qps = 0;
> > +	else
> > +		vsi->nb_qps = RTE_MIN
> > +			((uint16_t)vsi->adapter-
> > >hw.func_caps.common_cap.num_msix_vectors - 2,
> > +			RTE_MIN(vsi->nb_qps, ICE_MAX_Q_PER_TC));
> > +
> > +	/* nb_qps(hex)  -> fls */
> > +	/* 0000		-> 0 */
> > +	/* 0001		-> 0 */
> > +	/* 0002		-> 1 */
> > +	/* 0003 ~ 0004	-> 2 */
> > +	/* 0005 ~ 0008	-> 3 */
> > +	/* 0009 ~ 0010	-> 4 */
> > +	/* 0011 ~ 0020	-> 5 */
> > +	/* 0021 ~ 0040	-> 6 */
> > +	/* 0041 ~ 0080	-> 7 */
> > +	/* 0081 ~ 0100	-> 8 */
> > +	fls = (vsi->nb_qps == 0) ? 0 : rte_fls_u32(vsi->nb_qps - 1);
> >
> >  	qp_idx = 0;
> >  	/* Set tc and queue mapping with VSI */
> > --
> > 2.26.2
> 
> Acked-by: Wenjun Wu < wenjun1.wu at intel.com>
> 
> Thanks
> Wenjun
> 

Applied to dpdk-next-net-intel.

Thanks
Qi