netdev - Re: [PATCH net-next v4 0/4] sfc: support unicast PTP

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Message-ID: <20230221082550.5f694cce@kernel.org>
Date:   Tue, 21 Feb 2023 08:25:50 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Íñigo Huguet <ihuguet@...hat.com>
Cc:     ecree.xilinx@...il.com, habetsm.xilinx@...il.com,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        richardcochran@...il.com, netdev@...r.kernel.org,
        Yalin Li <yalli@...hat.com>
Subject: Re: [PATCH net-next v4 0/4] sfc: support unicast PTP

On Tue, 21 Feb 2023 13:52:13 +0100 Íñigo Huguet wrote:
> Unicast PTP was not working with sfc NICs.
> 
> The reason was that these NICs don't timestamp all incoming packets,
> but instead they only timestamp packets of the queues that are selected
> for that. Currently, only one RX queue is configured for timestamp: the
> RX queue of the PTP channel. The packets that are put in the PTP RX
> queue are selected according to firmware filters configured from the
> driver.
> 
> Multicast PTP was already working because the needed filters are known
> in advance, so they're inserted when PTP is enabled. This patches
> add the ability to dynamically add filters for unicast addresses,
> extracted from the TX PTP-event packets.
> 
> Since we don't know in advance how many filters we'll need, some info
> about the filters need to be saved. This will allow to check if a filter
> already exists or if a filter is too old and should be removed.
> 
> Note that the previous point is unnecessary for multicast filters, but
> I've opted to change how they're handled to match the new unicast's
> filters to avoid having duplicate insert/remove_filters functions,
> once for each type of filter.
> 
> Tested: With ptp4l, all combinations of IPv4/IPv6, master/slave and
> unicast/multicast


# Form letter - net-next is closed

The merge window for v6.3 has begun and therefore net-next is closed
for new drivers, features, code refactoring and optimizations.
We are currently accepting bug fixes only.

Please repost when net-next reopens after Mar 6th.

RFC patches sent for review only are obviously welcome at any time.