> -----Original Message-----
> From: Gavin Hu (Arm Technology China) [mailto:gavin...@arm.com]
> Sent: Tuesday, September 17, 2019 11:24 AM
> To: Gavin Hu (Arm Technology China) <gavin...@arm.com>; Zhang, Qi Z
> <qi.z.zh...@intel.com>; dev@dpdk.org
> Cc: nd <n...@arm.com>; tho...@monjalon.net; Richardson, Bruce
> <bruce.richard...@intel.com>; Liu, Yong <yong....@intel.com>; Wang, Yinan
> <yinan.w...@intel.com>; ajit.khapa...@broadcom.com;
> somnath.ko...@broadcom.com; Honnappa Nagarahalli
> <honnappa.nagaraha...@arm.com>; Ruifeng Wang (Arm Technology China)
> <ruifeng.w...@arm.com>; Steve Capper <steve.cap...@arm.com>
> Subject: RE: [dpdk-dev] [PATCH v2 1/5] net/i40e: use relaxed and remove
> duplicate barrier
>
> Hi Qi,
>
> > -----Original Message-----
> > From: dev <dev-boun...@dpdk.org> On Behalf Of Gavin Hu (Arm Technology
> > China)
> > Sent: Tuesday, September 17, 2019 10:08 AM
> > To: Zhang, Qi Z <qi.z.zh...@intel.com>; dev@dpdk.org
> > Cc: nd <n...@arm.com>; tho...@monjalon.net; Richardson, Bruce
> > <bruce.richard...@intel.com>; Liu, Yong <yong....@intel.com>; Wang,
> > Yinan <yinan.w...@intel.com>; ajit.khapa...@broadcom.com;
> > somnath.ko...@broadcom.com; Honnappa Nagarahalli
> > <honnappa.nagaraha...@arm.com>; Ruifeng Wang (Arm Technology China)
> > <ruifeng.w...@arm.com>; Steve Capper <steve.cap...@arm.com>
> > Subject: Re: [dpdk-dev] [PATCH v2 1/5] net/i40e: use relaxed and
> > remove duplicate barrier
> >
> > Hi Qi,
> >
> > > -----Original Message-----
> > > From: Zhang, Qi Z <qi.z.zh...@intel.com>
> > > Sent: Tuesday, September 17, 2019 9:53 AM
> > > To: Gavin Hu (Arm Technology China) <gavin...@arm.com>;
> > dev@dpdk.org
> > > Cc: nd <n...@arm.com>; tho...@monjalon.net; Richardson, Bruce
> > > <bruce.richard...@intel.com>; Liu, Yong <yong....@intel.com>; Wang,
> > Yinan
> > > <yinan.w...@intel.com>; ajit.khapa...@broadcom.com;
> > > somnath.ko...@broadcom.com; Honnappa Nagarahalli
> > > <honnappa.nagaraha...@arm.com>; Ruifeng Wang (Arm Technology
> > China)
> > > <ruifeng.w...@arm.com>; Steve Capper <steve.cap...@arm.com>
> > > Subject: RE: [dpdk-dev] [PATCH v2 1/5] net/i40e: use relaxed and
> > > remove duplicate barrier
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: dev [mailto:dev-boun...@dpdk.org] On Behalf Of Gavin Hu
> > > > Sent: Monday, September 16, 2019 7:27 PM
> > > > To: dev@dpdk.org
> > > > Cc: n...@arm.com; tho...@monjalon.net; Richardson, Bruce
> > > > <bruce.richard...@intel.com>; Liu, Yong <yong....@intel.com>;
> > > > Wang,
> > > Yinan
> > > > <yinan.w...@intel.com>; ajit.khapa...@broadcom.com;
> > > > somnath.ko...@broadcom.com; honnappa.nagaraha...@arm.com;
> > > > ruifeng.w...@arm.com; steve.cap...@arm.com
> > > > Subject: [dpdk-dev] [PATCH v2 1/5] net/i40e: use relaxed and
> > > > remove duplicate barrier
> > > >
> > > > To guarantee the orderings of successive stores to CIO and MMIO
> > memory,
> > > a
> > > > lighter weight rte_io_wmb [1] can be used instead of rte_wmb, and
> > since
> > > the
> > > > I40E_PCI_REG_WRITE API already has an inclusive rte_io_wmb, this
> > explicit
> > > call
> > > > can be even saved.
> > > >
> > > > [1]
> > http://git.dpdk.org/dpdk/tree/lib/librte_eal/common/include/generic/
> > > > rte_atomic.h#n98
> > > >
> > > > Signed-off-by: Gavin Hu <gavin...@arm.com>
> > >
> > > Can you also capture the one at the tail of i40e_xmit_pkts?
> > Thanks for your review, I will fix this in next version.
> I checked again, in this version, the rte_wmb at the tail of i40e_xmit_pkts
> was
> already removed and the following I40E_PCI_REG_WRITE_RELAXED was
> replaced by I40E_PCI_REG_WRITE, which has an inclusive rte_io_wmb.
Sorry, I must mixed the with ice patch, yes you are right, its already there.
> > >
> > > Otherwise
> > > Acked-by: Qi Zhang <qi.z.zh...@intel.com>
> > >
