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

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Date:   Wed, 22 Feb 2023 09:24:11 +0000
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     Íñigo Huguet <ihuguet@...hat.com>
Cc:     ecree.xilinx@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, 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, Feb 21, 2023 at 01:52:13PM +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
> 
> Reported-by: Yalin Li <yalli@...hat.com>
> Signed-off-by: Íñigo Huguet <ihuguet@...hat.com>

When you repost after net-next is open again please add my
Acked-by: Martin Habets <habetsm.xilinx@...il.com>

Thanks!

> 
> v2:
>  - fixed missing IS_ERR
>  - added doc of missing fields in efx_ptp_rxfilter
> v3:
>  - dropped pointless static inline in source file
>  - removed the now unused PTP_RXFILTERS_LEN
>  - follow reverse xmas tree convention in xmit_skb_mc
>  - pass expiry as argument to the insert_filter functions and keep returning an
>    integer error code from them, and not pointers, as suggested by Martin
>  - moved the unicast filters expiration check to the end of the worker function
>    to avoid increasing TX latency, as suggested by Martin
>  - added check to avoid inserting unicast filters when doing multicast PTP
> v4:
>  - fixed filter leak, catched by Edward
> 
> Íñigo Huguet (4):
>   sfc: store PTP filters in a list
>   sfc: allow insertion of filters for unicast PTP
>   sfc: support unicast PTP
>   sfc: remove expired unicast PTP filters
> 
>  drivers/net/ethernet/sfc/ptp.c | 272 +++++++++++++++++++++++++++------
>  1 file changed, 223 insertions(+), 49 deletions(-)
> 
> --
> 2.34.3