Hello Erez, Thank you for your time. I think the problem is not in Ethernet driver, because all applications over IPv6 work fine, at least I am not aware of a problem. PTP over IPv4 works fine as well. The problem is only in PTP over IPv6, and the problem is on receive side, because I decoded packets in WireShark and I see reasonable time stamps. I think somehow PTP extracts wrong time stamps. I agree it can be misconfiguration in PTP or Linux kernel or something else. If you tell me what information you need I will send it to you. I just don’t know what can be needed. Thank you. Vladimir
Vladimir Dubrovsky | Lead Firmware Engineer Phone: 201-367-6695 Ext: 12422 Email: vdubrov...@crestron.com Crestron Electronics, Inc. 22 Link Drive, Rockleigh, NJ 07647 CONFIDENTIALITY NOTICE: This e-mail message and any attachments may contain confidential and/or privileged information and is solely for the use of the intended recipients. Any unauthorized review, use, disclosure, or distribution is strictly prohibited. If you have received this message in error, please promptly notify the sender, and destroy all copies of the message and any attachments. From: Erez <erezge...@gmail.com> Sent: Saturday, July 08, 2023 9:36 AM To: Vladimir Dubrovsky <vdubrov...@crestron.com> Cc: linuxptp-devel@lists.sourceforge.net Subject: Re: [Linuxptp-devel] PTP4L over IPv6 doesn't converge clock Hi, There are 2 types of time-stamps RX and TX Both are retrieved in the msghdr of https: //man7. org/linux/man-pages/man3/recvmsg. 3p. html The RX time-stamp comes with the same message that contains the received packet. The TX is received with ZjQcmQRYFpfptBannerStart This Message Is From an Untrusted Sender You have not previously corresponded with this sender. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email. ZjQcmQRYFpfptBannerEnd Hi, There are 2 types of time-stamps RX and TX Both are retrieved in the msghdr of https://man7.org/linux/man-pages/man3/recvmsg.3p.html<https://urldefense.com/v3/__https:/man7.org/linux/man-pages/man3/recvmsg.3p.html__;!!PkykpUBa!Q7GcYl1lDd99tGa7LAsVmwKBZQMFhfSFnATrvhuIKodDXYqGCso13hiCRsbO-3SF35hHKD8ws05CskBAxc3b3g$> The RX time-stamp comes with the same message that contains the received packet. The TX is received with a message on the error queue after the packet is sent in the vendor Ethernet driver. RX time-stamp can be applied to all packets or only PTP (with proper configuration). The TX time-stamp is usually reserved for PTP packets. ptp4l can configure your kermel/vendor Ethernet driver. The mechanizm is identical to all sockets/network layers (raw, ipv4, ipv6) in ptp4l and in the kernel netlink (layer 2), It fills the message header with the time-stamps in the same manner. However the mechanism relies on the vendor Ethernet driver (module) to pass the time-stamp to the net-link on TX time-stamp, and add the time-stamp to the Linux SKB on RX time-stamp. According to your description, I would first look in the vendor Ethernet driver. First run with IPv4 and find the RX and TX time stamps. And then switch to IPv6. But there could also be a simple misconfiguration of your ptp4l or your system. You did not provide enough information to defer. Erez On Fri, 7 Jul 2023 at 20:46, Vladimir Dubrovsky via Linuxptp-devel <linuxptp-devel@lists.sourceforge.net<mailto:linuxptp-devel@lists.sourceforge.net>> wrote: Hello, I have a problem with ptp4l working with IPv6 messages. We use Linux version 4.19.0+ and ptp4l version 3.1. Everything works fine with PTP over IPv4. However when I run PTP over IPv6 I see that clock can’t converge. I checked messages in WireShark, everything looks reasonable. I run PTP with “- 6” option for IPv6. My feeling is PTP doesn’t read timestamp from IPv6 message properly. Do you have any idea what can be a problem or how can I debug the case? Thank you. Vladimir Dubrovsky | Lead Firmware Engineer Phone: 201‑367‑6695 Ext: 12422<tel:12422> Email: vdubrov...@crestron.com<mailto:vdubrov...@crestron.com> Crestron Electronics, Inc. 22 Link Drive, Rockleigh, NJ 07647 [Crestron]<https://www.crestron.com/> CONFIDENTIALITY NOTICE: This e-mail message and any attachments may contain confidential and/or privileged information and is solely for the use of the intended recipients. Any unauthorized review, use, disclosure, or distribution is strictly prohibited. If you have received this message in error, please promptly notify the sender, and destroy all copies of the message and any attachments. _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net<mailto:Linuxptp-devel@lists.sourceforge.net> https://lists.sourceforge.net/lists/listinfo/linuxptp-devel<https://urldefense.com/v3/__https:/lists.sourceforge.net/lists/listinfo/linuxptp-devel__;!!PkykpUBa!Q7GcYl1lDd99tGa7LAsVmwKBZQMFhfSFnATrvhuIKodDXYqGCso13hiCRsbO-3SF35hHKD8ws05CskAD-efCXg$>
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