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authorBen Hutchings <bhutchings@solarflare.com>2013-11-14 01:19:29 +0000
committerBen Hutchings <bhutchings@solarflare.com>2013-11-19 19:07:21 +0000
commitfd468c74bd4d6949736810a80d6ca05eb20fba84 (patch)
treec68b11620237ba704b740827ce952409b5666231 /Documentation
parent590d4693fb1c96ce441d11c6d1acb413a90b62e5 (diff)
downloadop-kernel-dev-fd468c74bd4d6949736810a80d6ca05eb20fba84.zip
op-kernel-dev-fd468c74bd4d6949736810a80d6ca05eb20fba84.tar.gz
net_tstamp: Add SIOCGHWTSTAMP ioctl to match SIOCSHWTSTAMP
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/timestamping.txt9
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt
index 98097d8..661d3c3 100644
--- a/Documentation/networking/timestamping.txt
+++ b/Documentation/networking/timestamping.txt
@@ -85,7 +85,7 @@ Filled in if SOF_TIMESTAMPING_SYS_HARDWARE is set. Requires support
by the network device and will be empty without that support.
-SIOCSHWTSTAMP:
+SIOCSHWTSTAMP, SIOCGHWTSTAMP:
Hardware time stamping must also be initialized for each device driver
that is expected to do hardware time stamping. The parameter is defined in
@@ -115,6 +115,10 @@ Only a processes with admin rights may change the configuration. User
space is responsible to ensure that multiple processes don't interfere
with each other and that the settings are reset.
+Any process can read the actual configuration by passing this
+structure to ioctl(SIOCGHWTSTAMP) in the same way. However, this has
+not been implemented in all drivers.
+
/* possible values for hwtstamp_config->tx_type */
enum {
/*
@@ -157,7 +161,8 @@ DEVICE IMPLEMENTATION
A driver which supports hardware time stamping must support the
SIOCSHWTSTAMP ioctl and update the supplied struct hwtstamp_config with
-the actual values as described in the section on SIOCSHWTSTAMP.
+the actual values as described in the section on SIOCSHWTSTAMP. It
+should also support SIOCGHWTSTAMP.
Time stamps for received packets must be stored in the skb. To get a pointer
to the shared time stamp structure of the skb call skb_hwtstamps(). Then
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