diff options
| author | Willem de Bruijn <willemb@google.com> | 2014-07-25 18:01:32 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-07-29 11:39:50 -0700 |
| commit | 4d276eb6a478307a28ae843836c455bf04b37a3c (patch) | |
| tree | 2915bc3a3e8ea825e7b02349b05915aaff8a91eb /Documentation/networking/timestamping.txt | |
| parent | 68a360e82e55c9b35097e7be7f7991d8f401032f (diff) | |
net: remove deprecated syststamp timestamp
The SO_TIMESTAMPING API defines three types of timestamps: software,
hardware in raw format (hwtstamp) and hardware converted to system
format (syststamp). The last has been deprecated in favor of combining
hwtstamp with a PTP clock driver. There are no active users in the
kernel.
The option was device driver dependent. If set, but without hardware
support, the correct behavior is to return zero in the relevant field
in the SCM_TIMESTAMPING ancillary message. Without device drivers
implementing the option, this field is effectively always zero.
Remove the internal plumbing to dissuage new drivers from implementing
the feature. Keep the SOF_TIMESTAMPING_SYS_HARDWARE flag, however, to
avoid breaking existing applications that request the timestamp.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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: |