mac80211: implement off-channel mgmt TX

This implements the new off-channel TX API
in mac80211 with a new work item type. The
operation doesn't add a new work item when
we're on the right channel and there's no
wait time so that for example p2p probe
responses will be transmitted without delay.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/net/mac80211/work.c b/net/mac80211/work.c
index ae344d1ba056..2b5c3f267198 100644
--- a/net/mac80211/work.c
+++ b/net/mac80211/work.c
@@ -561,6 +561,25 @@ ieee80211_remain_on_channel_timeout(struct ieee80211_work *wk)
 }
 
 static enum work_action __must_check
+ieee80211_offchannel_tx(struct ieee80211_work *wk)
+{
+        if (!wk->started) {
+                wk->timeout = jiffies + msecs_to_jiffies(wk->offchan_tx.wait);
+
+                /*
+                 * After this, offchan_tx.frame remains but now is no
+                 * longer a valid pointer -- we still need it as the
+                 * cookie for canceling this work.
+                 */
+                ieee80211_tx_skb(wk->sdata, wk->offchan_tx.frame);
+
+                return WORK_ACT_NONE;
+        }
+
+        return WORK_ACT_TIMEOUT;
+}
+
+static enum work_action __must_check
 ieee80211_assoc_beacon_wait(struct ieee80211_work *wk)
 {
         if (wk->started)
@@ -955,6 +974,9 @@ static void ieee80211_work_work(struct work_struct *work)
                 case IEEE80211_WORK_REMAIN_ON_CHANNEL:
                         rma = ieee80211_remain_on_channel_timeout(wk);
                         break;
+                case IEEE80211_WORK_OFFCHANNEL_TX:
+                        rma = ieee80211_offchannel_tx(wk);
+                        break;
                 case IEEE80211_WORK_ASSOC_BEACON_WAIT:
                         rma = ieee80211_assoc_beacon_wait(wk);
                         break;