netdev - Re: Broken SOF_TIMESTAMPING_OPT_ID in linux-4.19.y and earlier stable branches

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Message-ID: <20220325140558.qdxl25ggqhpztbjh@skbuf>
Date:   Fri, 25 Mar 2022 16:05:58 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: Broken SOF_TIMESTAMPING_OPT_ID in linux-4.19.y and earlier
 stable branches

On Fri, Mar 25, 2022 at 09:48:41AM -0400, Willem de Bruijn wrote:
> > Do you have any particular concerns about sending this patch to the
> > linux-stable branches for 4.19, 4.14 and 4.9? From https://www.kernel.org/
> > I see those are the only stable branches left.
> 
> The second patch does not apply cleanly to 4.14.y and even the first
> (one-liner) has a conflict on 4.9.y.
> 
> It would be good to verify by running the expanded
> tools/testing/selftests/net/txtimestamp.c against the patched kernels
> first. That should serve as a good test whether the feature works on a
> kernel, re: that previous point.
> 
> If you want to test and send the 4.19.y patch, please go ahead. Or I
> can do it, but it will take some time.

I think I do have a setup where I can test all 3 stable kernels.
I'll see if I can backport the SO_TIMESTAMPING fixes to them and
validate using the kernel selftest and my app. If I'm successful,
I'll attach the patchsets here for you to review, then send to stable if
you're okay, would that work?