[v11 2/3] net/af_xdp: fix multi interface support for K8s

[Maryam Tahhan]

On 01/03/2024 15:43, Loftus, Ciara wrote:
> snip
>
>> @@ -1695,17 +1699,16 @@ xsk_configure(struct pmd_internals *internals,
>> struct pkt_rx_queue *rxq,
>>   	}
>>
>>   	if (internals->use_cni) {
>> -		int err, fd, map_fd;
>> +		int err, map_fd;
>>
>> -		/* get socket fd from CNI plugin */
>> -		map_fd = get_cni_fd(internals->if_name);
>> +		/* get socket fd from AF_XDP Device Plugin */
>> +		map_fd = uds_get_xskmap_fd(internals->if_name, internals-
>>> dp_path);
>>   		if (map_fd < 0) {
>> -			AF_XDP_LOG(ERR, "Failed to receive CNI plugin fd\n");
>> +			AF_XDP_LOG(ERR, "Failed to receive xskmap fd from
>> AF_XDP Device Plugin\n");
>>   			goto out_xsk;
>>   		}
>> -		/* get socket fd */
>> -		fd = xsk_socket__fd(rxq->xsk);
>> -		err = bpf_map_update_elem(map_fd, &rxq->xsk_queue_idx,
>> &fd, 0);
>> +
>> +		err = xsk_socket__update_xskmap(rxq->xsk, map_fd);
> Hi Maryam,
>
> I've reviewed the series again. I haven't tested the device-plugin specific functionality as I don't have that environment set up, but outside of that I am happy that the new functionality doesn't break anything else. The doc updates look good to me now, thank you for the fixes.
>
> I have just spotted one issue and I apologise for only catching it now.
> Patch 2 introduces a dependency on the xsk_socket__update_xskmap function which is available in:
> libbpf >= v0.3.0 and <= v0.6.0
> libxdp > v1.2.0
>
> The af_xdp.rst guide states we are compatible with libbpf (on it's own) <= v0.6.0. So users using libbpf < v0.3.0 will get an undefined reference warning for the xsk_socket__update_xskmap function.
>
> Is it possible to implement fallback functionality (or if that's not possible, bail out) if that function is not available? See how this is done for the xsk_socket__create_shared function in meson.build and compat.h.
>
> Thanks,
> Ciara
>

Hi Ciara

Yeah, no prob - I can re introduce the ``bpf_map_update_elem()`` call as 
a fall back. I will need to retest the permissions as I remember 
escalated permissions being required when issuing that call directly in 
the PMD which is why I moved it to using ``xsk_socket__update_xskmap()`` 
but let me retest and circle back with some changes.

:) Looks like we are going to a v12 :)

BR Maryam
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