netdev - Re: Extending socket timestamping API for NTP

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Message-ID: <CACSApvYsn54hBZ7+vwM+TKjdBecTF9HLOj_LxXeb5vfF5EK8yA@mail.gmail.com>
Date:   Wed, 8 Feb 2017 06:18:02 -0800
From:   Soheil Hassas Yeganeh <soheil@...gle.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "Keller, Jacob E" <jacob.e.keller@...el.com>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Jiri Benc <jbenc@...hat.com>, Denny Page <dennypage@...com>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: Extending socket timestamping API for NTP

On Tue, Feb 7, 2017 at 2:32 PM, Willem de Bruijn
<willemdebruijn.kernel@...il.com> wrote:
>>> 2) new SO_TIMESTAMPING option to receive from the error queue only
>>>    user data as was passed to sendmsg() instead of Ethernet frames
>>>
>>>    Parsing Ethernet and IP headers (especially IPv6 options) is not
>>>    fun and SOF_TIMESTAMPING_OPT_ID is not always practical, e.g. in
>>>    applications which process messages from the error queue
>>>    asynchronously and don't bind/connect their sockets.
>>
>> This would be useful for application writing.
>
> What kind of user data are you suggesting? Just a user-defined ID
> passed as a cmsg? Allowing such metadata to override
> skb_shinfo(skb)->tskey sounds fine.

Yes, exactly. Just a user-defined ID that overrides the
skb_shinfo(skb)->tskey.

Thanks,
Soheil