Linux PTP Hardware Clock (PHC) subsystem, and synchronizing the system clock to it. Boundary Clock and Ordinary Clock. IEEE 802.1AS-2011 in the role of end station. Transport over UDP/IPv4, UDP/IPv6, and raw Ethernet (Layer 2 and VLAN).
The IEEE 1588 Precision Time Protocol was designed to achieve very accurate synchronization in distributed environments. Linux is becoming the leading operating system for embedded devices, but...

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PTP hardware clock infrastructure for Linux. This patch set introduces support for IEEE 1588 PTP clocks in Linux. Together with the SO_TIMESTAMPING socket options, this presents a standardized method for developing PTP user space programs, synchronizing Linux with external clocks, and using the ancillary features of PTP hardware clocks.
The objectives of the reference design include the following: • 6.99ns timestamp accuracy using Altera 1588 hardware IP and Linux PTP software stack for 10Gbps speed. • Offset adjustment capability from the system perspective for an ordinary clock (OC) in slave mode.

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PTP (Precision Time Protocol) •Use cases •Time synchronization among the switches and servers •Debug packet latency issues in the network •ASIC functions •Timestamping Tx/Rx packets •Adjust hardware clock time, e.g., offset, frequency •SAI Interface •Host traps (trap PTP packets)
This software is an implementation of the Precision Time Protocol (PTP) according to IEEE standard 1588 for Linux. The dual design goals are to provide. a robust implementation of the standard and to use the most relevant and modern. Application Programming Interfaces (API) offered by the Linux kernel. Supporting legacy APIs and other platforms is not a goal.

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in short: ptp_kvm.ko # modprobe ptp_kvm # ls /dev/ptp* /dev/ptp0 /dev/ptp_kvm in long: Red Hat Enterprise Linux 7.5 and later provide a virtual PTP hardware clock (PHC), which enables the guests to synchronize to the host with a sub-microsecond accuracy.
clock' command usually displays time from hardware clock while 'date' command display time from operating system clock. Actually '/bin/date' binary file is executed when 'date' command is issued. Only in rare occasions, you would happen to notice major time difference between output of 'clock' command and 'date' command, that's hardware and operating system clocks respectively.

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PTP hardware clock I PHC are used by hardware engines to timestamp packets. I The PHC must be synchronized. I Described by structptp_clock_info, which embeds operation callbacks: I gettimex64: reports the current time from the hardware clock by filling a timespec64 structure. I settime64: sets the time on the hardware clock.

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