netdev - Re: [PATCH net] tools: ynl: fix handling of multiple mcast groups

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Date: Tue, 27 Feb 2024 13:35:50 +0000
From: Donald Hunter <donald.hunter@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net,  netdev@...r.kernel.org,  edumazet@...gle.com,
  pabeni@...hat.com,  nicolas.dichtel@...nd.com,  willemb@...gle.com
Subject: Re: [PATCH net] tools: ynl: fix handling of multiple mcast groups

Jakub Kicinski <kuba@...nel.org> writes:

> We never increment the group number iterator, so all groups
> get recorded into index 0 of the mcast_groups[] array.
>
> As a result YNL can only handle using the last group.
> For example using the "netdev" sample on kernel with
> page pool commands results in:
>
>   $ ./samples/netdev
>   YNL: Multicast group 'mgmt' not found
>
> Most families have only one multicast group, so this hasn't
> been noticed. Plus perhaps developers usually test the last
> group which would have worked.
>
> Fixes: 86878f14d71a ("tools: ynl: user space helpers")
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>

Reviewed-by: Donald Hunter <donald.hunter@...il.com>