[PATCH v3] net/af_xdp: re-enable secondary process support

[Stephen Hemminger]

On Tue,  8 Feb 2022 13:48:00 +0000
Ciara Loftus <ciara.loftus at intel.com> wrote:

> +- **Secondary Processes**
> +
> +  Rx and Tx are not supported for secondary processes due to the single-producer
> +  single-consumer nature of the AF_XDP rings. However other operations including
> +  statistics retrieval are permitted.
> +  The maximum number of queues permitted for PMDs operating in this model is 8
> +  as this is the maximum number of fds that can be sent through the IPC APIs as
> +  defined by RTE_MP_MAX_FD_NUM.
> +

This seems like a restriction that is true for most devices in DPDK.
Most other devices also have restriction that on queues;
the hardware descriptor ring can only be used by one thread at a time.
Is this different with AF_XDP?