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net_tstamp: Add SIOCGHWTSTAMP ioctl to match SIOCSHWTSTAMP

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SIOCSHWTSTAMP returns the real configuration to the application
using it, but there is currently no way for any other
application to find out the configuration non-destructively.
Add a new ioctl for this, making it unprivileged.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2013-11-14 01:19:29 +00:00
commit fd468c74bd
5 changed files with 19 additions and 10 deletions
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14
include/uapi/linux/net_tstamp.h
View file

@ -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_filter: one of HWTSTAMP_FILTER_*
*
* %SIOCSHWTSTAMP expects a &struct ifreq with a ifr_data pointer to
* this structure. 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.
* %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;

3
include/uapi/linux/sockios.h
View file

@ -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 */