From: Luciano Coelho <luciano.coelho@xxxxxxxxx>
The userspace may want to delay the the first scheduled scan or
net-detect cycle. Add an optional attribute to the scheduled scan
configuration to pass the delay to be (optionally) used by the driver.
Signed-off-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
---
include/net/cfg80211.h | 5 +++++
include/uapi/linux/nl80211.h | 20 ++++++++++++++------
net/wireless/nl80211.c | 4 ++++
3 files changed, 23 insertions(+), 6 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7b44ba0..64e09e1 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1493,6 +1493,10 @@ struct cfg80211_match_set {
* @rcu_head: RCU callback used to free the struct
* @owner_nlportid: netlink portid of owner (if this should is a request
* owned by a particular socket)
+ * @delay: delay in seconds to use before starting the first scan
+ * cycle. The driver may ignore this parameter and start
+ * immediately (or at any other time), if this feature is not
+ * supported.
*/
struct cfg80211_sched_scan_request {
struct cfg80211_ssid *ssids;
@@ -1506,6 +1510,7 @@ struct cfg80211_sched_scan_request {
struct cfg80211_match_set *match_sets;
int n_match_sets;
s32 min_rssi_thold;
+ u32 delay;
u8 mac_addr[ETH_ALEN] __aligned(2);
u8 mac_addr_mask[ETH_ALEN] __aligned(2);
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index f52797a..9eaccf0 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -324,7 +324,9 @@
* if passed, define which channels should be scanned; if not
* passed, all channels allowed for the current regulatory domain
* are used. Extra IEs can also be passed from the userspace by
- * using the %NL80211_ATTR_IE attribute.
+ * using the %NL80211_ATTR_IE attribute. The first cycle of the
+ * scheduled scan can be delayed by %NL80211_ATTR_SCHED_SCAN_DELAY
+ * is supplied.
* @NL80211_CMD_STOP_SCHED_SCAN: stop a scheduled scan. Returns -ENOENT if
* scheduled scan is not running. The caller may assume that as soon
* as the call returns, it is safe to start a new scheduled scan again.
@@ -1735,6 +1737,9 @@ enum nl80211_commands {
* should be contained in the result as the sum of the respective counters
* over all channels.
*
+ * @NL80211_ATTR_SCHED_SCAN_DELAY: delay before a scheduled scan (or a
+ * WoWLAN net-detect scan) is started, u32 in seconds.
+ *
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2098,6 +2103,8 @@ enum nl80211_attrs {
NL80211_ATTR_SURVEY_RADIO_STATS,
+ NL80211_ATTR_SCHED_SCAN_DELAY,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -3741,11 +3748,12 @@ struct nl80211_pattern_support {
* @NL80211_WOWLAN_TRIG_NET_DETECT: wake up when a configured network
* is detected. This is a nested attribute that contains the
* same attributes used with @NL80211_CMD_START_SCHED_SCAN. It
- * specifies how the scan is performed (e.g. the interval and the
- * channels to scan) as well as the scan results that will
- * trigger a wake (i.e. the matchsets). This attribute is also
- * sent in a response to @NL80211_CMD_GET_WIPHY, indicating the
- * number of match sets supported by the driver (u32).
+ * specifies how the scan is performed (e.g. the interval, the
+ * channels to scan and the initial delay) as well as the scan
+ * results that will trigger a wake (i.e. the matchsets). This
+ * attribute is also sent in a response to
+ * @NL80211_CMD_GET_WIPHY, indicating the number of match sets
+ * supported by the driver (u32).
* @NL80211_WOWLAN_TRIG_NET_DETECT_RESULTS: nested attribute
* containing an array with information about what triggered the
* wake up. If no elements are present in the array, it means
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8e56eeb..f2ef811 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6204,6 +6204,10 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
}
}
+ if (attrs[NL80211_ATTR_SCHED_SCAN_DELAY])
+ request->delay =
+ nla_get_u32(attrs[NL80211_ATTR_SCHED_SCAN_DELAY]);
+
request->interval = interval;
request->scan_start = jiffies;
--
2.1.4
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