[Linuxptp-users] Filter for master nodes

[Yan Yankovskyi via Linuxptp-users]

Hello,

I need to restrict ptp4l slave to accept one specific ptp4l instance as a
master, e.g. by MAC address. The reason is security concern. Are there any
solutions for such a problem? I thought about disabling BMCA and defining
master node manually, but I'm not sure is it possible. Maybe the best way
is to check clock id for the node that BMCA has chosen?

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Yan Yankovskyi | Junior Software Engineer, Ukraine
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Re: [Linuxptp-users] ptp4l doesn't recognize /dev/ptp0

[Yan Yankovskyi via Linuxptp-users]

> Just making the device node in the system does not instantiate the
> actual device in the kernel.  Only the device driver can do that.

ptp driver is built into the kernel, if you are talking about it.
I can see ptp in /proc/devices as well. But /dev/ptp0 device isn't present
after startup.


On Tue, Apr 24, 2018 at 5:30 PM, Richard Cochran <richardcoch...@gmail.com>
wrote:

> On Tue, Apr 24, 2018 at 01:35:29PM +0300, Yan Yankovskyi via
> Linuxptp-users wrote:
> > I use the following command:
> >
> > mknod /dev/ptp0 c 252 0
> >
> > On ptp4l launch I'm getting the following error:
> >
> > Failed to open /dev/ptp0: No such device or address
> >
> > But it is actually present. Do you have any thoughts regarding this
> > situation?
>
> Just making the device node in the system does not instantiate the
> actual device in the kernel.  Only the device driver can do that.
>
> HTH,
> Richard
>



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[Linuxptp-users] ptp4l doesn't recognize /dev/ptp0

[Yan Yankovskyi via Linuxptp-users]

Hello,

After manual creation of /dev/ptp0 node, ptp4l doesn't accept this node as
a PTP clock.
I use the following command:

mknod /dev/ptp0 c 252 0

On ptp4l launch I'm getting the following error:

Failed to open /dev/ptp0: No such device or address

But it is actually present. Do you have any thoughts regarding this
situation?

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Yan Yankovskyi | Junior Software Engineer, Ukraine
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[Linuxptp-users] PTP data in kernel space

[Yan Yankovskyi via Linuxptp-users]

Hello,

I need to get gmTimeBaseIndicator, gmIdentity
and clock value. I use the following command:

pmc -u -b 0 'GET TIME_STATUS_NP'

But I need to receive this data in a kernel module,
and sending the data from user to kernel space is inefficient.
Is there a way of getting such data in kernel space?

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Yan Yankovskyi | Junior Software Engineer, Ukraine
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Re: [Linuxptp-users] Software clock

[Yan Yankovskyi via Linuxptp-users]

I need to use PTP synchronization for synchronizing video stream (something
like this). To do it I have to adjust the clock, but using the system clock
looks like bad architecture decision. So I decided to ask is it possible to
have some separate clock, that will be dedicated only for this purpose.
By the way, 802.1AS-2011 standard describes application interfaces (chapter
9), especially ClockTarget. Is it implemented in ptp4l, or it should be
implemented using some custom software?

On Thu, Mar 22, 2018 at 6:12 PM, Richard Cochran <richardcoch...@gmail.com>
wrote:

>
> On Thu, Mar 22, 2018 at 09:15:31AM +0200, Yan Yankovskyi via
> Linuxptp-users wrote:
> > In case of use software timestamping we are adjusting system clock. Is it
> > possible to create another clock, and use it in ptp4l? I see that in
> > clock_create function in case if phc_index < 0 we use CLOCK_REALTIME as
> > value for clkid, so I suppose it isn't possible.
>
> Right.  The kernel delivers SW time stamps on CLOCK_REALTIME, and so
> the use of CLOCK_REALTIME with SW time stamping is hard coded.
>
> > But it implies that using
> > software timestamping we are limited to only one instance of ptp4l at the
> > same time, while using hardware timestamping we can launch as many ptp4l
> > instances simultaneously, as many physical devices we have, right?
>
> Well, using option free_running=1 you can have as many instances as
> you like, but I'm not sure why would anyone want to do this.  You can
> even launch multiple ptp4l programs on the same interface in different
> PTP domains, assuming at most one instance has free_running=0.
>
> What problem are you trying to solve?
>
> Thanks,
> Richard
>
>


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[Linuxptp-users] Software clock

[Yan Yankovskyi via Linuxptp-users]

Hello,
In case of use software timestamping we are adjusting system clock. Is it
possible to create another clock, and use it in ptp4l? I see that in
clock_create function in case if phc_index < 0 we use CLOCK_REALTIME as
value for clkid, so I suppose it isn't possible. But it implies that using
software timestamping we are limited to only one instance of ptp4l at the
same time, while using hardware timestamping we can launch as many ptp4l
instances simultaneously, as many physical devices we have, right?

-- 
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Yan Yankovskyi | Junior Software Engineer, Ukraine
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[Linuxptp-users] Increase synchronization frequency

[Yan Yankovskyi via Linuxptp-users]

Hello.
I try to reduce logSyncInterval below default value 0, and I am keep
getting 1 sync message per second. I use the same settings for both master
and slave. Increasing of this value works as expected, but decreasing
affects only output format (avg and max value / variance of values for each
field instead of a single value). I use software timestamping. What am I
doing wrong? Thanks.

BTW, in set_tmo_log() function there is a conditional expression
while (tmo.it_value.tv_nsec >= NS_PER_SEC)
In what situation can it be true?

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Yan Yankovskyi | Junior Software Engineer, Ukraine
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Re: [Linuxptp-users] Bad message error

[Yan Yankovskyi via Linuxptp-users]

> The topic was running PTP over a VLAN
> interface.  This is now fully supported by the Linux kernel.

Even in kernel version 4.15.2 in file net/8021q/vlan_dev.c function
vlan_ethtool_get_ts_info contains the following code:

info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE;

And it seems that absence of SOF_TIMESTAMPING_TX_SOFTWARE flag
in this place is leading to fail in ethtool check. Is adding the flag in
this function
is all I need to do to implement this functionality? It seems like it
isn't, but I'm not
sure. Don't you know any manual I could refer?

Also, as a network driver I am using a custom EoP driver. Do you have any
ideas
about on which stage something can go wrong? I guess that the problem may be
caused by this driver.


On Wed, Feb 7, 2018 at 5:52 PM, Richard Cochran 
wrote:

> On Wed, Feb 07, 2018 at 12:39:12PM +0200, Yan Yankovskyi wrote:
> > On Tue, Feb 6, 2018 at 7:49 PM, Richard Cochran <
> richardcoch...@gmail.com>
> > wrote:
> > > By "board running Linux" you mean a custom embedded design, don't you?
> >
> > Exactly. Connection is established using the BroadR-Reach <-> Ethernet
> > converter, if it matters.
>
> IOW, you are using your own unpublished custom driver.  Sorry, can't
> help you with that.
>
> If there is an issue with TLV handling, please reproduce it using
> standard drivers and unaltered linuxptp sources.  Then, post the
> details of the configuration.
>
> > >> ethtool reports that the board doesn't support
> > SOF_TIMESTAMPING_TX_SOFTWARE,
> >
> > > Then you are out of luck.
> >
> > Is it crucial? Am I able to add support of this timestamp mode by myself?
>
> I hope so.
>
> Thanks,
> Richard
>



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Re: [Linuxptp-users] Bad message error

[Yan Yankovskyi via Linuxptp-users]

I also checked the values for the working case, where the host behaves as a
slave, and I found out that:
1) *ptr value is always set to 0x;
2) len (cnt - pdulen) is either 0 or 2, i.e. it is always less then
sizeof(struct TLV).

On Wed, Feb 7, 2018 at 12:39 PM, Yan Yankovskyi <
yan.yankovs...@globallogic.com> wrote:

> On Tue, Feb 6, 2018 at 7:49 PM, Richard Cochran 
> wrote:
> > By "board running Linux" you mean a custom embedded design, don't you?
>
> Exactly. Connection is established using the BroadR-Reach <-> Ethernet
> converter, if it matters.
>
> >> ethtool reports that the board doesn't support
> SOF_TIMESTAMPING_TX_SOFTWARE,
>
> > Then you are out of luck.
>
> Is it crucial? Am I able to add support of this timestamp mode by myself?
>
> > Looks like the endianness of the value is wrong.
>
> You mean endianess of *ptr variable value? Because if I have for example
> 0x68e3 or 0xe368 values for tlv->length field, it doesn't change much.
> I have a raw value of *ptr equal to 0x68e3, doesn't it seem like a
> correct value? It implies that tlv->type equals 0.
>
> Thanks.
>
> --
> Best regards,
>
> Yan Yankovskyi | Junior Software Engineer, Ukraine
> GlobalLogic
> M  +380.95.049.64.73 <+380950496473>   Skype huandesale
>
> www.globallogic.com
>
> http://www.globallogic.com/email_disclaimer.txt
>



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Yan Yankovskyi | Junior Software Engineer, Ukraine
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Re: [Linuxptp-users] Bad message error

[Yan Yankovskyi via Linuxptp-users]

On Tue, Feb 6, 2018 at 7:49 PM, Richard Cochran 
wrote:
> By "board running Linux" you mean a custom embedded design, don't you?

Exactly. Connection is established using the BroadR-Reach <-> Ethernet
converter, if it matters.

>> ethtool reports that the board doesn't support
SOF_TIMESTAMPING_TX_SOFTWARE,

> Then you are out of luck.

Is it crucial? Am I able to add support of this timestamp mode by myself?

> Looks like the endianness of the value is wrong.

You mean endianess of *ptr variable value? Because if I have for example
0x68e3 or 0xe368 values for tlv->length field, it doesn't change much.
I have a raw value of *ptr equal to 0x68e3, doesn't it seem like a
correct value? It implies that tlv->type equals 0.

Thanks.

-- 
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Yan Yankovskyi | Junior Software Engineer, Ukraine
GlobalLogic
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[Linuxptp-users] Bad message error

[Yan Yankovskyi via Linuxptp-users]

Hello,

I have a configuration with a PC running Ubuntu and a board running Linux.
ethtool reports that the board doesn't support SOF_TIMESTAMPING_TX_SOFTWARE,
and I disabled ethtool check as mentioned in this post
http://linuxptp-users.narkive.com/Q6DUVkta/using-ptp4l-on-vlan-interfaces#post7
. Now if the board behaves as a master, I see correct log on the PC. But
when I try use slave-only mode on the board, it says "port 1: bad message"
all the time. I found out that error detects in the "suffix_post_recv"
function ("msg.c" file). len variable is always equal to 6, but tlv->length
variable is taking for example the following values: 210, 20250, 50666,
18066, and so on. Such values lead to failing either on (tlv->length % 2)
or on (tlv->length > len) check, and I'm gerring -EBADMSG error. I would be
thankful if anyone could explain what do such values mean and what can be
the cause. Please correct if I'm using wrong mailing list.


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