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authorJohannes Berg <johannes.berg@intel.com>2011-09-29 16:04:32 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-09-30 15:57:15 -0400
commit4049e09acdf4ffd270cb8fbf1cf5b39c3d02357c (patch)
tree87aa0bc08650b5cc745733fcf422dcf871caeb43 /net/mac80211/sta_info.c
parent8a8656fa5bbbc8568348d95184d374edb03a48b7 (diff)
downloadblackbird-op-linux-4049e09acdf4ffd270cb8fbf1cf5b39c3d02357c.tar.gz
blackbird-op-linux-4049e09acdf4ffd270cb8fbf1cf5b39c3d02357c.zip
mac80211: allow releasing driver-buffered frames
If there are frames for a station buffered in the driver, mac80211 announces those in the TIM IE but there's no way to release them. Add new API to release such frames and use it when the station polls for a frame. Since the API will soon also be used for uAPSD it is easily extensible. Note that before this change drivers announcing driver-buffered frames in the TIM bit actually will respond to a PS-Poll with a potentially lower priority frame (if there are any frames buffered in mac80211), after this patch a driver that hasn't been changed will no longer respond at all. This only affects ath9k, which will need to be fixed to implement the new API. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r--net/mac80211/sta_info.c82
1 files changed, 66 insertions, 16 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 4d85672f0b8f..b3f841948c09 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1157,8 +1157,10 @@ void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb = NULL;
+ bool found = false;
bool more_data = false;
int ac;
+ unsigned long driver_release_tids = 0;
u8 ignore_for_response = sta->sta.uapsd_queues;
/*
@@ -1173,19 +1175,40 @@ void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
* Get response frame and more data bit for it.
*/
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+ unsigned long tids;
+
if (ignore_for_response & BIT(ac))
continue;
- if (!skb) {
- skb = skb_dequeue(&sta->tx_filtered[ac]);
- if (!skb) {
- skb = skb_dequeue(&sta->ps_tx_buf[ac]);
+ tids = ieee80211_tids_for_ac(ac);
+
+ if (!found) {
+ driver_release_tids = sta->driver_buffered_tids & tids;
+ if (driver_release_tids) {
+ found = true;
+ } else {
+ skb = skb_dequeue(&sta->tx_filtered[ac]);
+ if (!skb) {
+ skb = skb_dequeue(&sta->ps_tx_buf[ac]);
+ if (skb)
+ local->total_ps_buffered--;
+ }
if (skb)
- local->total_ps_buffered--;
+ found = true;
}
- }
- /* FIXME: take into account driver-buffered frames */
+ /*
+ * If the driver has data on more than one TID then
+ * certainly there's more data if we release just a
+ * single frame now (from a single TID).
+ */
+ if (hweight16(driver_release_tids) > 1) {
+ more_data = true;
+ driver_release_tids =
+ BIT(ffs(driver_release_tids) - 1);
+ break;
+ }
+ }
if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
!skb_queue_empty(&sta->ps_tx_buf[ac])) {
@@ -1194,6 +1217,22 @@ void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
}
}
+ if (!found) {
+#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
+ /*
+ * FIXME: This can be the result of a race condition between
+ * us expiring a frame and the station polling for it.
+ * Should we send it a null-func frame indicating we
+ * have nothing buffered for it?
+ */
+ printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
+ "though there are no buffered frames for it\n",
+ sdata->name, sta->sta.addr);
+#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
+
+ return;
+ }
+
if (skb) {
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr =
@@ -1220,18 +1259,29 @@ void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
ieee80211_add_pending_skb(local, skb);
sta_info_recalc_tim(sta);
-#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
} else {
/*
- * FIXME: This can be the result of a race condition between
- * us expiring a frame and the station polling for it.
- * Should we send it a null-func frame indicating we
- * have nothing buffered for it?
+ * We need to release a frame that is buffered somewhere in the
+ * driver ... it'll have to handle that.
+ * Note that, as per the comment above, it'll also have to see
+ * if there is more than just one frame on the specific TID that
+ * we're releasing from, and it needs to set the more-data bit
+ * accordingly if we tell it that there's no more data. If we do
+ * tell it there's more data, then of course the more-data bit
+ * needs to be set anyway.
+ */
+ drv_release_buffered_frames(local, sta, driver_release_tids,
+ 1, IEEE80211_FRAME_RELEASE_PSPOLL,
+ more_data);
+
+ /*
+ * Note that we don't recalculate the TIM bit here as it would
+ * most likely have no effect at all unless the driver told us
+ * that the TID became empty before returning here from the
+ * release function.
+ * Either way, however, when the driver tells us that the TID
+ * became empty we'll do the TIM recalculation.
*/
- printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
- "though there are no buffered frames for it\n",
- sdata->name, sta->sta.addr);
-#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
}
}
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