Commit Graph

8 Commits

Author SHA1 Message Date
Pedro F. Giffuni
02abd40029 kernel: use our nitems() macro when it is available through param.h.
No functional change, only trivial cases are done in this sweep,

Discussed in:	freebsd-current
2016-04-19 23:48:27 +00:00
Hans Petter Selasky
0e1152fcc2 The SYSCTL data pointers can come from userspace and must not be
directly accessed. Although this will work on some platforms, it can
throw an exception if the pointer is invalid and then panic the kernel.

Add a missing SYSCTL_IN() of "SCTP_BASE_STATS" structure.

MFC after:	3 days
Sponsored by:	Mellanox Technologies
2014-10-28 12:00:39 +00:00
Lawrence Stewart
66dcfed32a Revise the sysctl handling code and restructure the hierarchy of sysctls
introduced when feed-forward clock support is enabled in the kernel:

- Rename the "choice" variable to "available".

- Streamline the implementation of the "active" variable's sysctl handler
  function.

- Create a kern.sysclock sysctl node for general sysclock related configuration
  options. Place the "available" and "active" variables under this node.

- Create a kern.sysclock.ffclock sysctl node for feed-forward clock specific
  configuration options. Place the "version" and "ffcounter_bypass" variables
  under this node.

- Tweak some of the description strings.

Discussed with:	Julien Ridoux (jridoux at unimelb edu au)
2011-12-01 07:19:13 +00:00
Lawrence Stewart
6f83fc5112 Make sysclock_active publicly available to external consumers.
Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.

For more information, see http://www.synclab.org/radclock/

Discussed with:	Julien Ridoux (jridoux at unimelb edu au)
Submitted by:	Julien Ridoux (jridoux at unimelb edu au)
2011-11-29 08:43:04 +00:00
Lawrence Stewart
66761af34f Export the "ffclock" feature for kernels compiled with feed-forward clock
support.

Suggested by:	netchild
Reviewed by:	netchild
2011-11-26 01:44:37 +00:00
Lawrence Stewart
cf13a58510 - Add the ffclock_getcounter(), ffclock_getestimate() and ffclock_setestimate()
system calls to provide feed-forward clock management capabilities to
  userspace processes. ffclock_getcounter() returns the current value of the
  kernel's feed-forward clock counter. ffclock_getestimate() returns the current
  feed-forward clock parameter estimates and ffclock_setestimate() updates the
  feed-forward clock parameter estimates.

- Document the syscalls in the ffclock.2 man page.

- Regenerate the script-derived syscall related files.

Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.

For more information, see http://www.synclab.org/radclock/

Submitted by:	Julien Ridoux (jridoux at unimelb edu au)
2011-11-21 01:26:10 +00:00
Lawrence Stewart
9bce0f05fe - Provide a sysctl interface to change the active system clock at runtime.
- Wrap [get]{bin,nano,micro}[up]time() functions of sys/time.h to allow
  requesting time from either the feedback or the feed-forward clock. If a
  feedback (e.g. ntpd) and feed-forward (e.g. radclock) daemon are both running
  on the system, both kernel clocks are updated but only one serves time.

- Add similar wrappers for the feed-forward difference clock.

Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.

For more information, see http://www.synclab.org/radclock/

Submitted by:	Julien Ridoux (jridoux at unimelb edu au)
2011-11-20 05:32:12 +00:00
Lawrence Stewart
f464c5ccb5 Provide high-level functions to access the feed-forward absolute and difference
clocks. Each routine can output an upper bound on the absolute time or time
interval requested. Different flavours of absolute time can be requested, for
example with or without leap seconds, monotonic or not, etc.

Committed on behalf of Julien Ridoux and Darryl Veitch from the University of
Melbourne, Australia, as part of the FreeBSD Foundation funded "Feed-Forward
Clock Synchronization Algorithms" project.

For more information, see http://www.synclab.org/radclock/

Submitted by:	Julien Ridoux (jridoux at unimelb edu au)
2011-11-20 01:20:50 +00:00