netdev - Re: [chrony-dev] Support for Multiple PPS Inputs on single PHC

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Message-ID: <Y/OQkNJQ6CP+FaIT@hoboy.vegasvil.org>
Date:   Mon, 20 Feb 2023 07:24:00 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Miroslav Lichvar <mlichvar@...hat.com>
Cc:     Matt Corallo <ntp-lists@...tcorallo.com>,
        chrony-dev@...ony.tuxfamily.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [chrony-dev] Support for Multiple PPS Inputs on single PHC

On Mon, Feb 20, 2023 at 11:08:23AM +0100, Miroslav Lichvar wrote:
> Does it need to be that way? It seems strange for the kernel to
> support enabling PPS on multiple channels at the same time, but not
> allow multiple applications to receive all samples from their channel.

It does not need to be that way, but nobody ever wanted multiple
readers before.

Implementing this would make the kernel side much more complex, as the
code would need per-reader tracking of the buffered time stamps, or
per-reader fifo buffers, etc.

Thanks,
Richard