netdev - Re: [PATCH net-next] tsnep: Fix rotten packets

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Message-ID: <fd546e83a38157b76f8bde2219f985c70056abf7.camel@redhat.com>
Date:   Tue, 22 Nov 2022 15:51:05 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Gerhard Engleder <gerhard@...leder-embedded.com>,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, edumazet@...gle.com
Subject: Re: [PATCH net-next] tsnep: Fix rotten packets

On Sat, 2022-11-19 at 22:18 +0100, Gerhard Engleder wrote:
> If PTP synchronisation is done every second, then sporadic the interval
> is higher than one second:
> 
> ptp4l[696.582]: master offset        -17 s2 freq   -1891 path delay 573
> ptp4l[697.582]: master offset        -22 s2 freq   -1901 path delay 573
> ptp4l[699.368]: master offset         -1 s2 freq   -1887 path delay 573
>       ^^^^^^^ Should be 698.582!
> 
> This problem is caused by rotten packets, which are received after
> polling but before interrupts are enabled again. This can be fixed by
> checking for pending work and rescheduling if necessary after interrupts
> has been enabled again.
> 
> Fixes: 403f69bbdbad ("tsnep: Add TSN endpoint Ethernet MAC driver")
> Signed-off-by: Gerhard Engleder <gerhard@...leder-embedded.com>

For the records, when targeting the net tree, you should include the
'net' tag into the patch prefix, instead of 'net-next'.

Thanks,

Paolo