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nl80211: allow BSS data to include CLOCK_BOOTTIME timestamp

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For location and connectivity services, userspace would often like
to know the time when the BSS was last seen. The current "last seen"
value is calculated in a way that makes it less useful, especially
if the system suspended in the meantime.

Add the ability for the driver to report a real CLOCK_BOOTTIME stamp
that can then be reported to userspace (if present).

Drivers wishing to use this must be converted to the new API to call
cfg80211_inform_bss_data() or cfg80211_inform_bss_frame_data(). They
need to ensure the reported value is accurate enough even when the
frame might have been buffered in the device (e.g. firmware.)

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
[modified to use struct, inlines]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Dmitry Shmidt
2015-10-07 11:32:53 +02:00
committed by Johannes Berg
parent 93f0490e5d
commit 6e19bc4b70
7 changed files with 130 additions and 60 deletions
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5
net/wireless/nl80211.c
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@@ -6605,6 +6605,11 @@ static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
jiffies_to_msecs(jiffies - intbss->ts)))
goto nla_put_failure;
if (intbss->ts_boottime &&
nla_put_u64(msg, NL80211_BSS_LAST_SEEN_BOOTTIME,
intbss->ts_boottime))
goto nla_put_failure;
switch (rdev->wiphy.signal_type) {
case CFG80211_SIGNAL_TYPE_MBM:
if (nla_put_u32(msg, NL80211_BSS_SIGNAL_MBM, res->signal))