Merge branch 'siocghwtstamp' of git://git.kernel.org/pub/scm/linux/kernel/git/bwh/sfc-next

Ben Hutchings says:

====================
SIOCGHWTSTAMP ioctl

1. Add the SIOCGHWTSTAMP ioctl and update the timestamping
documentation.
2. Implement SIOCGHWTSTAMP in most drivers that support SIOCSHWTSTAMP.
3. Add a test program to exercise SIOC{G,S}HWTSTAMP.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 9 deletions

diff --git a/include/uapi/linux/net_tstamp.h b/include/uapi/linux/net_tstamp.h
index ae5df122e42f..f53879c0f590 100644
--- a/include/uapi/linux/net_tstamp.h
+++ b/include/uapi/linux/net_tstamp.h
@@ -26,17 +26,17 @@ enum {
 };
 
 /**
- * struct hwtstamp_config - %SIOCSHWTSTAMP parameter
+ * struct hwtstamp_config - %SIOCGHWTSTAMP and %SIOCSHWTSTAMP parameter
  *
- * @flags:      no flags defined right now, must be zero
+ * @flags:      no flags defined right now, must be zero for %SIOCSHWTSTAMP
  * @tx_type:    one of HWTSTAMP_TX_*
- * @rx_type:    one of one of HWTSTAMP_FILTER_*
+ * @rx_filter:  one of HWTSTAMP_FILTER_*
  *
- * %SIOCSHWTSTAMP expects a &struct ifreq with a ifr_data pointer to
- * this structure. dev_ifsioc() in the kernel takes care of the
- * translation between 32 bit userspace and 64 bit kernel. The
- * structure is intentionally chosen so that it has the same layout on
- * 32 and 64 bit systems, don't break this!
+ * %SIOCGHWTSTAMP and %SIOCSHWTSTAMP expect a &struct ifreq with a
+ * ifr_data pointer to this structure.  For %SIOCSHWTSTAMP, if the
+ * driver or hardware does not support the requested @rx_filter value,
+ * the driver may use a more general filter mode.  In this case
+ * @rx_filter will indicate the actual mode on return.
  */
 struct hwtstamp_config {
         int flags;
diff --git a/include/uapi/linux/sockios.h b/include/uapi/linux/sockios.h
index 7997a506ad41..e888b1aed69f 100644
--- a/include/uapi/linux/sockios.h
+++ b/include/uapi/linux/sockios.h
@@ -125,7 +125,8 @@
 #define SIOCBRDELIF     0x89a3          /* remove interface from bridge */
 
 /* hardware time stamping: parameters in linux/net_tstamp.h */
-#define SIOCSHWTSTAMP   0x89b0
+#define SIOCSHWTSTAMP   0x89b0          /* set and get config           */
+#define SIOCGHWTSTAMP   0x89b1          /* get config                   */
 
 /* Device private ioctl calls */