Re: [dpdk-dev] [PATCH] net/i40e: i40e FDIR update rate optimization

["Sun, Chenmin" <chenmin.sun@intel.com>]

Best Regards,
Sun, Chenmin

> -----Original Message-----
> From: Wang, Haiyue <haiyue.wang@intel.com>
> Sent: Wednesday, July 8, 2020 4:41 PM
> To: Sun, Chenmin <chenmin.sun@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Wu, Jingjing
> <jingjing.wu@intel.com>
> Cc: dev@dpdk.org; Sun, Chenmin <chenmin.sun@intel.com>
> Subject: RE: [dpdk-dev] [PATCH] net/i40e: i40e FDIR update rate optimization
> 
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of chenmin.sun@intel.com
> > Sent: Saturday, June 13, 2020 02:00
> > To: Zhang, Qi Z <qi.z.zhang@intel.com>; Xing, Beilei
> > <beilei.xing@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>
> > Cc: dev@dpdk.org; Sun, Chenmin <chenmin.sun@intel.com>
> > Subject: [dpdk-dev] [PATCH] net/i40e: i40e FDIR update rate
> > optimization
> >
> > From: Chenmin Sun <chenmin.sun@intel.com>
> >
> > This patch optimized the fdir update rate for i40e PF, by tracking the
> > fdir rule will be inserted into guaranteed space or shared space.
> > For the flows that are inserted to the guaranteed space, it returns
> > success directly without retrieving the result for NIC.
> >
> > This patch changes the global register GLQF_CTL. Therefore, when
> > devarg ``Support multiple driver`` is set, the patch will not take
> > effect to avoid affecting the normal behavior of other i40e drivers,
> > e.g., Linux kernel driver.
> >
> > Signed-off-by: Chenmin Sun <chenmin.sun@intel.com>
> > ---
> >  drivers/net/i40e/i40e_ethdev.c  |  96 ++++++++++++++++-
> > drivers/net/i40e/i40e_ethdev.h  |  57 +++++++---
> >  drivers/net/i40e/i40e_fdir.c    | 182 +++++++++++++++++++++-----------
> >  drivers/net/i40e/i40e_flow.c    | 181 +++++++++++++++++++++++++------
> >  drivers/net/i40e/i40e_rxtx.c    |  15 ++-
> >  drivers/net/i40e/rte_pmd_i40e.c |   2 +-
> >  6 files changed, 417 insertions(+), 116 deletions(-)
> >
> 
> 
> >
> > +static
> > +uint32_t bin_search(uint64_t data)
> > +{
> > +	uint32_t pos = 0;
> > +
> > +	if ((data & 0xFFFFFFFF) == 0) {
> > +		data >>= 32;
> > +		pos += 32;
> > +	}
> > +
> > +	if ((data & 0xFFFF) == 0) {
> > +		data >>= 16;
> > +		pos += 16;
> > +	}
> > +	if ((data & 0xFF) == 0) {
> > +		data >>= 8;
> > +		pos += 8;
> > +	}
> > +	if ((data & 0xF) == 0) {
> > +		data >>= 4;
> > +		pos += 4;
> > +	}
> > +	if ((data & 0x3) == 0) {
> > +		data >>= 2;
> > +		pos += 2;
> > +	}
> > +	if ((data & 0x1) == 0)
> > +		pos += 1;
> > +
> > +	return pos;
> > +}
> > +
> 
> Try " __builtin_ctzll ", DPDK has many examples to use it. ;-)
> 

Thanks, I have replaced it with rte_bsf64()

> > --
> > 2.17.1