I found some information regarding SOF_TIMESTAMPING_TX_SOFTWARE capability
https://sourceforge.net/p/linuxptp/mailman/message/35474590/ You need to add one line to the transmit path in the driver: skb_tx_timestamp(skb); Quoting include/linux/skbuff.h: * skb_tx_timestamp() - Driver hook for transmit timestamping * * Ethernet MAC Drivers should call this function in their hard_xmit() * function immediately before giving the sk_buff to the MAC hardware. * * Specifically, one should make absolutely sure that this function is * called before TX completion of this packet can trigger. Otherwise * the packet could potentially already be freed. if I modify the nic driver with above changes then will ptp4l able to start the ptp service ? Regards, Raveendra On Wed, Mar 13, 2019 at 6:25 PM Miroslav Lichvar <mlich...@redhat.com> wrote: > On Wed, Mar 13, 2019 at 06:19:34PM +0530, Raveendra Muniyappa wrote: > > [root@2-9 ~]# ethtool -T eth0 > > Time stamping parameters for eth0: > > Capabilities: > > software-receive (SOF_TIMESTAMPING_RX_SOFTWARE) > > software-system-clock (SOF_TIMESTAMPING_SOFTWARE) > > > Mar 13 17:56:17 2-9 ptp4l: [1397593.140] interface 'eth0' does not > support > > requested timestamping mode > > > Any suggestion how ptp4l service can be started and also use software > based > > timestamping for ptp protocol. > > ptp4l cannot be started on this interface. It requires the > SOF_TIMESTAMPING_TX_SOFTWARE capability, which is not printed by > ethtool. > > -- > Miroslav Lichvar >
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