mac80211: support hw scan while idle
Currently, mac80211 goes to idle-off before starting a scan.
However, some devices that implement hw scan might not
need going idle-off in order to perform a hw scan, and
thus saving some energy and simplifying their state machine.
(Note that this is also the case for sched scan - it
currently doesn't make mac80211 go idle-off)
Add a new flag to indicate support for hw scan while idle.
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 922313f..cbff4f9 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1164,6 +1164,10 @@
* @IEEE80211_HW_TX_AMPDU_SETUP_IN_HW: The device handles TX A-MPDU session
* setup strictly in HW. mac80211 should not attempt to do this in
* software.
+ *
+ * @IEEE80211_HW_SCAN_WHILE_IDLE: The device can do hw scan while
+ * being idle (i.e. mac80211 doesn't have to go idle-off during the
+ * the scan).
*/
enum ieee80211_hw_flags {
IEEE80211_HW_HAS_RATE_CONTROL = 1<<0,
@@ -1190,6 +1194,7 @@
IEEE80211_HW_SUPPORTS_PER_STA_GTK = 1<<21,
IEEE80211_HW_AP_LINK_PS = 1<<22,
IEEE80211_HW_TX_AMPDU_SETUP_IN_HW = 1<<23,
+ IEEE80211_HW_SCAN_WHILE_IDLE = 1<<24,
};
/**
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index affe64b..483e96e 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -263,6 +263,8 @@
sf += snprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
sf += snprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
+ if (local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)
+ sf += snprintf(buf + sf, mxln - sf, "SCAN_WHILE_IDLE\n");
rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
kfree(buf);
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 19f0818..6b3cd65 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1332,7 +1332,8 @@
wk->sdata->vif.bss_conf.idle = false;
}
- if (local->scan_sdata) {
+ if (local->scan_sdata &&
+ !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
scanning = true;
local->scan_sdata->vif.bss_conf.idle = false;
}
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 362e89d..831a5bd 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -697,6 +697,9 @@
)
return -EINVAL;
+ if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
+ return -EINVAL;
+
if (hw->max_report_rates == 0)
hw->max_report_rates = hw->max_rates;