synce4l is a software implementation of Synchronous Ethernet (Sync-E) according to ITU-T Recommendation G.8264. The design goal is to provide logic to supported hardware by processing Ethernet Synchronization Messaging Channel (ESMC) and control Digital Phase Locked Loop (DPLL) clock on Network Card Interface (NIC).
Application can operate in two mutually exclusive modes. If both modes are configured simultaneously, the external input takes precedence over internal one (internal is disabled implicitly). External input mode If synce4l is configured to run in "external input" mode, then DPLL needs to have external 1PPS source attached (GPS or another generator). In this scenario synce4l always broadcasts clock quality level (QL) defined in configuration file. Additionally, for this mode incoming Sync-E frames do not participate in best source selection algorithm for DPLL. Internal input mode In "internal input" mode incoming Sync-E frames are processed and best clock source is extracted from the link having the best quality level. synce4l configures such "best quality" port as a source to recover clock for DPLL. The recovered QL is broadcasted to all other interfaces then. An external clock cannot be used in this mode. Hardware synce4l is not bound to any specific NIC hardware. Theoretically any NIC could be used for enabling Sync-E device in External input mode - the NIC in this mode is in leader role (similar to Grand Master role in PTP), providing its Quality Level information in ESMC frames to its neighbors. It will not syntonize to any of its neighbor ports, since RX frames are not monitored. Only other Sync-E enabled neighbor ports could recover clock from that peer and syntonize to it. Practically this mode shall be used only if the NIC PHY ports are fed with stable and reliable frequency clock, Quality Level values that are sent to the peers are configured by the user. This is user responsibility to decide and set proper Quality-Level value for the device, corresponding to the quality of frequency clock generator of used hardware. When enabling Internal input mode, the NIC must be a device that actually, supports Synchronous Ethernet, which means it is able to syntonize frequency of all configured ports within the device to one chosen port - clock is recovered from its RX path, then is fed to other ports with Phase-Locked Loop (PLL) circuit powering clock of other ports. The NIC driver or dedicated software must provide a user with ability to: obtain current state of a DPLL used to syntonize the ports select one of the ports as a candidate for clock recovery. Both abilities are configurable in config file - the user must provide a shell commands - as explained in manual and descriptions inside of example config file. Arkadiusz Kubalewski (11): synce4l: add config knobs for SyncE synce4l: add synce in interface and util code synce4l: add esmc_socket interface synce4l: add synce_clock interface synce4l: add synce_dev interface synce4l: add synce_dev_ctrl interface synce4l: add synce_port interface synce4l: add synce_port_ctrl interface synce4l: add synce_msg interface synce4l: add synce_transport interface synce4l: add synce4l application README.org | 2 + config.c | 198 +++++-- config.h | 8 + configs/synce.cfg | 194 +++++++ esmc_socket.c | 111 ++++ esmc_socket.h | 53 ++ interface.c | 29 +- interface.h | 24 + makefile | 17 +- synce4l.8 | 239 ++++++++ synce4l.c | 144 +++++ synce4l_README.md | 194 +++++++ synce_clock.c | 296 ++++++++++ synce_clock.h | 52 ++ synce_dev.c | 634 ++++++++++++++++++++++ synce_dev.h | 76 +++ synce_dev_ctrl.c | 165 ++++++ synce_dev_ctrl.h | 76 +++ synce_msg.c | 271 ++++++++++ synce_msg.h | 186 +++++++ synce_msg_private.h | 99 ++++ synce_port.c | 504 +++++++++++++++++ synce_port.h | 197 +++++++ synce_port_ctrl.c | 1077 +++++++++++++++++++++++++++++++++++++ synce_port_ctrl.h | 177 ++++++ synce_transport.c | 116 ++++ synce_transport.h | 67 +++ synce_transport_private.h | 30 ++ util.c | 22 + util.h | 8 + 30 files changed, 5216 insertions(+), 50 deletions(-) create mode 100644 configs/synce.cfg create mode 100644 esmc_socket.c create mode 100644 esmc_socket.h create mode 100644 synce4l.8 create mode 100644 synce4l.c create mode 100644 synce4l_README.md create mode 100644 synce_clock.c create mode 100644 synce_clock.h create mode 100644 synce_dev.c create mode 100644 synce_dev.h create mode 100644 synce_dev_ctrl.c create mode 100644 synce_dev_ctrl.h create mode 100644 synce_msg.c create mode 100644 synce_msg.h create mode 100644 synce_msg_private.h create mode 100644 synce_port.c create mode 100644 synce_port.h create mode 100644 synce_port_ctrl.c create mode 100644 synce_port_ctrl.h create mode 100644 synce_transport.c create mode 100644 synce_transport.h create mode 100644 synce_transport_private.h -- 2.34.1 _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
