[PATCH v6] net/af_xdp: support CNI Integration

[Ferruh Yigit]

On 2/15/2023 4:30 PM, Shibin Koikkara Reeny wrote:
> Integrate support for the AF_XDP CNI and device plugin [1] so that the
> DPDK AF_XDP PMD can work in an unprivileged container environment.
> Part of the AF_XDP PMD initialization process involves loading
> an eBPF program onto the given netdev. This operation requires
> privileges, which prevents the PMD from being able to work in an
> unprivileged container (without root access). The plugin CNI handles
> the program loading. CNI open Unix Domain Socket (UDS) and waits
> listening for a client to make requests over that UDS. The client(DPDK)
> connects and a "handshake" occurs, then the File Descriptor which points
> to the XSKMAP associated with the loaded eBPF program is handed over
> to the client. The client can then proceed with creating an AF_XDP
> socket and inserting the socket into the XSKMAP pointed to by the
> FD received on the UDS.
> 
> A new vdev arg "use_cni" is created to indicate user wishes to run
> the PMD in unprivileged mode and to receive the XSKMAP FD from the CNI.
> When this flag is set, the XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD libbpf flag
> should be used when creating the socket, which tells libbpf not to load the
> default libbpf program on the netdev. We tell libbpf not to do this because
> the loading is handled by the CNI in this scenario.
> 
> Patch include howto doc explain how to configure AF_XDP CNI to
> working with DPDK.
> 
> [1]: https://github.com/intel/afxdp-plugins-for-kubernetes
> 
> Signed-off-by: Shibin Koikkara Reeny <shibin.koikkara.reeny at intel.com>

Keeping tags from previous version, since change is only in
documentation I believe they are still valid, please let me know if not,
I can drop them in next-net:

Tested-by: Anatoly Burakov <anatoly.burakov at intel.com>
Reviewed-by: Qi Zhang <qi.z.zhang at intel.com>
Acked-by: John McNamara <john.mcnamara at intel.com>


Acked-by: Ferruh Yigit <ferruh.yigit at amd.com>


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