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mac80211: support hw scan while idle

Browse source 
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 <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
This commit is contained in:
Eliad Peller 2012-02-02 17:44:55 +02:00 • committed by John W. Linville
commit 885bd8eca6
4 changed files with 12 additions and 1 deletions
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2
net/mac80211/debugfs.c
View file

@ -263,6 +263,8 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
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);

3
net/mac80211/iface.c
View file

@ -1332,7 +1332,8 @@ u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
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;
}

3
net/mac80211/main.c
View file

@ -697,6 +697,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
)
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;