netdev - iproute2/user space code obsoletion when depending on kernel features WAS([PATCH net-next 0/5] net/sched: Retire some tc qdiscs and classifiers)

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Message-ID: <CAM0EoMmfkjFvD9hyaQryEn-RFyfAiYBDCKpJXr3uZpQ=PTA5tA@mail.gmail.com>
Date:   Tue, 14 Feb 2023 09:01:32 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        David Ahern <dsahern@...il.com>
Subject: iproute2/user space code obsoletion when depending on kernel features
 WAS([PATCH net-next 0/5] net/sched: Retire some tc qdiscs and classifiers)

Refer to: https://lore.kernel.org/netdev/20230214134915.199004-1-jhs@mojatatu.com/T/#t

I dont believe this has been done before so some introspection is needed.
The option seem to be:
1) Delete it from the iproute2 version that maps to a kernel version
2) Keep it around and dont bother syncing specific kernel headers in
the next version. This would allow newer iproute2 to continue
supporting older kernels.
Additionally, add an ominous message saying that the feature is no
longer supported in newer kernels.

cheers,
jamal