diff options
Diffstat (limited to 'Documentation/networking/timestamping.txt')
| -rw-r--r-- | Documentation/networking/timestamping.txt | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt index 8b4ad809df27..897f942b976b 100644 --- a/Documentation/networking/timestamping.txt +++ b/Documentation/networking/timestamping.txt @@ -88,15 +88,8 @@ hwtimeraw is the original hardware time stamp. Filled in if SOF_TIMESTAMPING_RAW_HARDWARE is set. No assumptions about its relation to system time should be made. -hwtimetrans is the hardware time stamp transformed so that it -corresponds as good as possible to system time. This correlation is -not perfect; as a consequence, sorting packets received via different -NICs by their hwtimetrans may differ from the order in which they were -received. hwtimetrans may be non-monotonic even for the same NIC. -Filled in if SOF_TIMESTAMPING_SYS_HARDWARE is set. Requires support -by the network device and will be empty without that support. This -field is DEPRECATED. Only one driver computes this value. New device -drivers must leave this zero. Instead, they can expose the hardware +hwtimetrans is always zero. This field is deprecated. It used to hold +hw timestamps converted to system time. Instead, expose the hardware clock device on the NIC directly as a HW PTP clock source, to allow time conversion in userspace and optionally synchronize system time with a userspace PTP stack such as linuxptp. For the PTP clock API, @@ -191,7 +184,6 @@ struct skb_shared_hwtstamps { * since arbitrary point in time */ ktime_t hwtstamp; - ktime_t syststamp; /* hwtstamp transformed to system time base */ }; Time stamps for outgoing packets are to be generated as follows: |