[v7 1/1] net/af_xdp: fix multi interface support for K8s

[Maryam Tahhan]

On 11/01/2024 11:35, Ferruh Yigit wrote:
> Devarg is user interface, changing it impacts the user.
>
> Assume that user of '22.11.3' using 'use_cni' dev_arg, it will be broken
> when user upgrades DPDK to '22.11.4', which is not expected.
>
> dev_arg is not API/ABI but as it impacts the user, it is in the gray
> area to backport to the LTS release.
Fair enough
>
>
> Current patch doesn't have Fixes tag or stable tag, so it doesn't
> request to be backported to LTS release. I took this as an improvement,
> more than a fix.

This was overlooked by me apologies. It's been a while since I've 
contributed to DPDK and I must've missed this detail in the contribution 
guide.
> As far as I understand existing code (that use 'use_cni' dev_arg)
> supports only single netdev, this patch adds support for multiple netdevs.

The use_cni implementation will no longer work with the AF_XDP DP as the 
use_cni was originally implemented as it has hard coded what's now an 
incorrect path for the UDS.

>
> So what do you think keep LTS with 'use_cni' dev_arg, is there a
> requirement to update LTS release?
> If so, can it be an option to keep 'use_cni' for backward compatibility
> but add only add 'uds_path' and remove 'use_cni' in next LTS?


Yeah we can go back to the version of the patch that had the 'use_cni' 
flag that was used in combination with the path argument. We can add 
better documentation re the "use_cni" misnomer... What we can then do is 
if no path argument is set by the user assume their intent and and 
generate the path internally in the AF_XDP PMD (which was suggested by 
Shibin at some stage). That way there should be no surprises to the End 
User.

Long term I would like to keep a (renamed) path argument (in case the 
path does ever change from the AF_XDP DP POV) and use it also in 
combination with another (maybe boolean) param for passing pinned bpf 
maps rather than another separate path.

WDYT? Would this work for the LTS release?

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