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Message-ID: <CAF=yD-LMxMz0NgQQEyoWf_K5=HEqbWmuCjBMKF+NxNLwZw8FEg@mail.gmail.com> Date: Tue, 16 May 2017 18:29:47 -0400 From: Willem de Bruijn <willemdebruijn.kernel@...il.com> To: Miroslav Lichvar <mlichvar@...hat.com> Cc: Network Development <netdev@...r.kernel.org>, Richard Cochran <richardcochran@...il.com>, Willem de Bruijn <willemb@...gle.com> Subject: Re: [PATCH v3 net-next 4/7] net: add new control message for incoming HW-timestamped packets On Tue, May 16, 2017 at 8:44 AM, Miroslav Lichvar <mlichvar@...hat.com> wrote: > Add SOF_TIMESTAMPING_OPT_PKTINFO option to request a new control message > for incoming packets with hardware timestamps. It contains the index of > the real interface which received the packet and the length of the > packet at layer 2. > > The index is useful with bonding, bridges and other interfaces, where > IP_PKTINFO doesn't allow applications to determine which PHC made the > timestamp. With the L2 length (and link speed) it is possible to > transpose preamble timestamps to trailer timestamps, which are used in > the NTP protocol. > > While this information could be provided by two new socket options > independently from timestamping, it doesn't look like they would be very > useful. With this option any performance impact is limited to hardware > timestamping. > > Use dev_get_by_napi_id() to get the device and its index. On kernels > with disabled CONFIG_NET_RX_BUSY_POLL or drivers not using NAPI, a zero > index will be returned in the control message. > > CC: Richard Cochran <richardcochran@...il.com> > CC: Willem de Bruijn <willemb@...gle.com> > Signed-off-by: Miroslav Lichvar <mlichvar@...hat.com> Acked-by: Willem de Bruijn <willemb@...gle.com>
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