Intel E810-CQDA2T - DPLL Monitoring

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Intel
®
Ethernet Network Adapter E810-CQDA2T
User Guide
Lock times for each of the DPLLs are different and are subject to change and can take a long time to
lock depending on their initial synchronization.
Status options: invalid, freerun, locked, locked_ho_acq (locked and holdover acquired), holdover,
and uninitialized.
The Phase offset value helps to find out how well the PPS DPLL is synchronized (in 100 ps units)
Note: The DPLL firmware version should be 6201 for all production units. If you have a different
version, please contact your Intel representative.
4.10 DPLL Monitoring
In the default configuration, the E810-CQDA2T driver enables monitoring of the DPLL events and
reports state changes in the default system log (dmesg) with the WARN level independently for each of
the DPLL units.
DPLLs start in a holdover mode and enter an unlocked and locked state when a valid reference input is
enabled. If the current input becomes invalid, DPLLs change state to holdover. When the reference
reappears (or a different valid input is present), the DPLL state changes to the unlocked state and locks
to a new signal.
# dmesg | grep "state changed"
[23.740121] ice 0000:01:00.0: <DPLL0> state changed to: holdover, pin CVL-SDP22
[23.740833] ice 0000:01:00.0: <DPLL1> state changed to: holdover, pin CVL-SDP22
#GNSS signal appeared
[57.857575] ice 0000:01:00.0: <DPLL0> state changed to: unlocked, pin GNSS-1PPS
[57.858088] ice 0000:01:00.0: <DPLL1> state changed to: unlocked, pin GNSS-1PPS
[119.810415] ice 0000:01:00.0: <DPLL0> state changed to: locked, pin GNSS-1PPS
[178.818056] ice 0000:01:00.0: <DPLL1> state changed to: locked, pin GNSS-1PPS
#GNSS signal lost:
[18.833552] ice 0000:01:00.0: <DPLL0> state changed to: holdover, pin GNSS-1PPS
[18.834065] ice 0000:01:00.0: <DPLL1> state changed to: holdover, pin GNSS-1PPS
#GNSS signal re-appeared:
[19.825608] ice 0000:01:00.0: <DPLL0> state changed to: unlocked, pin GNSS-1PPS
[19.826122] ice 0000:01:00.0: <DPLL1> state changed to: unlocked, pin GNSS-1PPS
[21.841638] ice 0000:01:00.0: <DPLL0> state changed to: locked, pin GNSS-1PPS
[21.850270] ice 0000:01:00.0: <DPLL1> state changed to: locked, pin GNSS-1PPS
DPLL monitoring can be enabled (on) or disabled (off) by using the ethtool command in the Linux
kernel.
# export ETH=ens801f0
ethtool --show-priv-flags $ETH
Private flags for ens801f0:
link-down-on-close : off
fw-lldp-agent : off
channel-inline-flow-director : off
channel-inline-fd-mark : off
channel-pkt-inspect-optimize : on
channel-pkt-clean-bp-stop : off
channel-pkt-clean-bp-stop-cfg: off
vf-true-promisc-support : off
mdd-auto-reset-vf : off
vf-vlan-prune-disable : off