netdev - Re: [PATCH net-next v4 3/4] sfc: support unicast PTP

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Date:   Wed, 22 Feb 2023 08:52:45 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     Íñigo Huguet <ihuguet@...hat.com>
Cc:     Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
        ecree.xilinx@...il.com, habetsm.xilinx@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        Yalin Li <yalli@...hat.com>
Subject: Re: [PATCH net-next v4 3/4] sfc: support unicast PTP

On Wed, Feb 22, 2023 at 03:41:51PM +0100, Íñigo Huguet wrote:

> The reason is explained in a comment in efx_ptp_insert_multicast filters:
>    Must filter on both event and general ports to ensure
>    that there is no packet re-ordering

There is nothing wrong with re-ordering.  Nothing guarantees that
datagrams are received in the order they are sent.

The user space PTP stack must be handle out of order messages correct
(which ptp4l does do BTW).

Thanks,
Richard