[PATCH v4] net/af_xdp: re-enable secondary process support

[Stephen Hemminger]

On Wed,  9 Feb 2022 09:48:08 +0000
Ciara Loftus <ciara.loftus at intel.com> wrote:

> Secondary process support had been disabled for the AF_XDP PMD because
> there was no logic in place to share the AF_XDP socket file descriptors
> between the processes. This commit introduces this logic using the IPC
> APIs.
> 
> Rx and Tx are disabled in the secondary process due to memory mapping of
> the AF_XDP rings being assigned by the kernel in the primary process only.
> However other operations including retrieval of stats are permitted.
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>

Acked-by: Stephen Hemminger <stephen at networkplumber.org>