[dpdk-dev] [PATCH RFC 0/1] net/af_xdp: shared UMEM support

[Ferruh Yigit]

On 8/11/2020 10:50 AM, Ciara Loftus wrote:
> This RFC integrates shared UMEM support into the AF_XDP PMD. It is based on the
> WIP kernel series [1] by Magnus Karlsson.
> 
> Detailed information on the shared UMEM feature can be found in the final patch
> in the aforementioned series.
> 
> Support for the kernel feature can eventually be detected in DPDK by querying
> the LINUX_KERNEL_VERSION. As of now the feature is not yet merged upstream, so
> for this RFC it is assumed the user is using a patched version of v5.8.

Hi Ciara,

I don't see this feature in kernel in 5.9.0-rc2, is there any update in the
kernel side?

> 
> Shared UMEM is only available for zero copy mode.
> 
> In order to share UMEM information between PMDs, the ethdevs wishing to share
> must be tracked somehow. The method chosen to do so is similar to methods used
> in the vHost [2] and vDPA drivers, where pointers to the ethdevs are maintained
> in an internal list. Proposals for alternate solutions are welcome.
> 
> Performance data to follow with the v1.
> 
> [1] https://patchwork.ozlabs.org/project/netdev/cover/1595307848-20719-1-git-send-email-magnus.karlsson@intel.com/
> [2] https://git.dpdk.org/dpdk/commit/?id=ee584e9710b9abd60ee9faef664e106dcea10085
> 
> Ciara Loftus (1):
>   net/af_xdp: shared UMEM support
> 
>  doc/guides/nics/af_xdp.rst          |   5 +-
>  drivers/net/af_xdp/rte_eth_af_xdp.c | 315 ++++++++++++++++++++++------
>  2 files changed, 252 insertions(+), 68 deletions(-)
>