Re: [Linuxptp-users] recvmsg tx timestamp failed: Resource temporarily unavailable

[Richard C. <ric...@gm...>]

On Tue, Feb 05, 2013 at 06:18:05PM +0530, Rayagond Kokatanur wrote:
> Hi All
> 
> I am getting following messages when I run the command - ptp4l -i eth1
> -p /dev/ptp0 -m
> 
> ptp4l[9393.328]: selected /dev/ptp0 as PTP clock
> ptp4l[9393.330]: failed to read out the clock frequency adjustment:
> Operation not supported

Looks like your /dev/ptp0 does not support clock_adjtime().

> ptp4l[9393.330]: port 1: get_ts_info not supported
> ptp4l[9393.335]: port 1: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[9393.335]: port 0: INITIALIZING to LISTENING on INITIALIZE
> ptp4l[9399.335]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
> ptp4l[9400.342]: recvmsg tx timestamp failed: Resource temporarily unavailable

No Tx time stamp arrived on the socket error queue. The code tries to
read this 100 times, but you can increase the number of retries using
the 'tx_timestamp_retries' configuration file option.

> I am returning the timestamp back to socket using "skb_tstamp_tx()"
> api in my driver.

So I guess that your have custom, unpublished driver. It looks like to
me that the driver is not working correctly. You can check the PHC
functions of the driver by using the 'testptp' program found in
Documentation/ptp in the Linux kernel source tree.

You can also test the SO_TIMESTAMPING support using the program found
in Documentation/networking/timestamping.

HTH,
Richard