[dpdk-stable] [PATCH v2 0/2] i40e Rx descriptor loads ordering

[Zhang, Qi Z]

> -----Original Message-----
> From: Ruifeng Wang <ruifeng.wang at arm.com>
> Sent: Wednesday, September 15, 2021 4:34 PM
> To: dev at dpdk.org
> Cc: Xing, Beilei <beilei.xing at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>;
> Richardson, Bruce <bruce.richardson at intel.com>; jerinj at marvell.com;
> hemant.agrawal at nxp.com; drc at linux.vnet.ibm.com;
> honnappa.nagarahalli at arm.com; stable at dpdk.org; nd at arm.com; Ruifeng
> Wang <ruifeng.wang at arm.com>
> Subject: [PATCH v2 0/2] i40e Rx descriptor loads ordering
> 
> On Rx path, NIC fills Rx descriptor with data pertains to received packet.
> 
> A single descriptor consists of multiple words. Word1 has the bit that indicates
> readiness of descriptor for software to use. So word1 should be loaded before
> other words.
> 
> On architectures with weaker memory ordering, barrier is needed to ensure
> the ordering of loads.
> 
> This patch set fixed the risk on both scalar path and aarch64 vector path.
> 
> v2:
> Updated commit message. Performance impact added. (Honnappa)
> 
> Ruifeng Wang (2):
>   net/i40e: fix risk in Rx descriptor read in NEON vector path
>   net/i40e: fix risk in Rx descriptor read in scalar path
> 
>  drivers/net/i40e/i40e_rxtx.c          | 12 ++++++++++++
>  drivers/net/i40e/i40e_rxtx_vec_neon.c |  8 ++++++++
>  2 files changed, 20 insertions(+)
> 
> --
> 2.25.1

Applied to dpdk-next-net-intel.

Thanks
Qi