Re: [dpdk-dev] [PATCH v3 1/1] net/af_xdp: shared UMEM support

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 9/23/2020 8:34 AM, Ciara Loftus wrote:
> Kernel v5.10 will introduce the ability to efficiently share a UMEM
> between AF_XDP sockets bound to different queue ids on the same or
> different devices. This patch integrates that functionality into the AF_XDP
> PMD.
> 
> A PMD will attempt to share a UMEM with others if the shared_umem=1 vdev
> arg is set. UMEMs can only be shared across PMDs with the same mempool, up
> to a limited number of PMDs goverened by the size of the given mempool.
> Sharing UMEMs is not supported for non-zero-copy (aligned) mode.
> 
> The benefit of sharing UMEM across PMDs is a saving in memory due to not
> having to register the UMEM multiple times. Throughput was measured to
> remain within 2% of the default mode (not sharing UMEM).
> 
> A version of libbpf >= v0.2.0 is required and the appropriate pkg-config
> file for libbpf must be installed such that meson can determine the
> version.

Tested providing the devarg when kernel/library support is not there 
cause gracefully exit. Not able to test the functionality, relying Ciara 
on it.

> 
> Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>

Applied to dpdk-next-net/main, thanks.