mac80211: allow the driver to send EOSP when needed
This can happen when the driver needs to send less frames
than expected and then needs to close the SP.
Mac80211 still needs to set the more_data properly based
on its buffer state (ps_tx_buffer and buffered frames on
other TIDs).
To that end, refactor the code that delivers frames upon
uAPSD trigger frames to be able to get only the more_data
bit without actually delivering those frames in case the
driver is just asking to set a NDP with EOSP and MORE_DATA
bit properly set.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 8f630f5..723fa30 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2,6 +2,7 @@
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2013-2014 Intel Mobile Communications GmbH
+ * Copyright (C) 2015 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -1244,11 +1245,11 @@
ieee80211_check_fast_xmit(sta);
}
-static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
- struct sta_info *sta, int tid,
+static void ieee80211_send_null_response(struct sta_info *sta, int tid,
enum ieee80211_frame_release_type reason,
- bool call_driver)
+ bool call_driver, bool more_data)
{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
struct ieee80211_qos_hdr *nullfunc;
struct sk_buff *skb;
@@ -1288,9 +1289,13 @@
if (qos) {
nullfunc->qos_ctrl = cpu_to_le16(tid);
- if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
+ if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
nullfunc->qos_ctrl |=
cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
+ if (more_data)
+ nullfunc->frame_control |=
+ cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+ }
}
info = IEEE80211_SKB_CB(skb);
@@ -1337,22 +1342,48 @@
return fls(tids) - 1;
}
+/* Indicates if the MORE_DATA bit should be set in the last
+ * frame obtained by ieee80211_sta_ps_get_frames.
+ * Note that driver_release_tids is relevant only if
+ * reason = IEEE80211_FRAME_RELEASE_PSPOLL
+ */
+static bool
+ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
+ enum ieee80211_frame_release_type reason,
+ unsigned long driver_release_tids)
+{
+ int ac;
+
+ /* 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). This will
+ * only happen for PS-Poll.
+ */
+ if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
+ hweight16(driver_release_tids) > 1)
+ return true;
+
+ for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+ if (ignored_acs & BIT(ac))
+ continue;
+
+ if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
+ !skb_queue_empty(&sta->ps_tx_buf[ac]))
+ return true;
+ }
+
+ return false;
+}
+
static void
-ieee80211_sta_ps_deliver_response(struct sta_info *sta,
- int n_frames, u8 ignored_acs,
- enum ieee80211_frame_release_type reason)
+ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
+ enum ieee80211_frame_release_type reason,
+ struct sk_buff_head *frames,
+ unsigned long *driver_release_tids)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
struct ieee80211_local *local = sdata->local;
- bool more_data = false;
int ac;
- unsigned long driver_release_tids = 0;
- struct sk_buff_head frames;
-
- /* Service or PS-Poll period starts */
- set_sta_flag(sta, WLAN_STA_SP);
-
- __skb_queue_head_init(&frames);
/* Get response frame(s) and more data bit for the last one. */
for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
@@ -1366,26 +1397,13 @@
/* if we already have frames from software, then we can't also
* release from hardware queues
*/
- if (skb_queue_empty(&frames)) {
- driver_release_tids |= sta->driver_buffered_tids & tids;
- driver_release_tids |= sta->txq_buffered_tids & tids;
+ if (skb_queue_empty(frames)) {
+ *driver_release_tids |=
+ sta->driver_buffered_tids & tids;
+ *driver_release_tids |= sta->txq_buffered_tids & tids;
}
- if (driver_release_tids) {
- /* 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). This will
- * only happen for PS-Poll.
- */
- if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
- hweight16(driver_release_tids) > 1) {
- more_data = true;
- driver_release_tids =
- BIT(find_highest_prio_tid(
- driver_release_tids));
- break;
- }
- } else {
+ if (!*driver_release_tids) {
struct sk_buff *skb;
while (n_frames > 0) {
@@ -1399,20 +1417,44 @@
if (!skb)
break;
n_frames--;
- __skb_queue_tail(&frames, skb);
+ __skb_queue_tail(frames, skb);
}
}
- /* If we have more frames buffered on this AC, then set the
- * more-data bit and abort the loop since we can't send more
- * data from other ACs before the buffered frames from this.
+ /* If we have more frames buffered on this AC, then abort the
+ * loop since we can't send more data from other ACs before
+ * the buffered frames from this.
*/
if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
- !skb_queue_empty(&sta->ps_tx_buf[ac])) {
- more_data = true;
+ !skb_queue_empty(&sta->ps_tx_buf[ac]))
break;
- }
}
+}
+
+static void
+ieee80211_sta_ps_deliver_response(struct sta_info *sta,
+ int n_frames, u8 ignored_acs,
+ enum ieee80211_frame_release_type reason)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ struct ieee80211_local *local = sdata->local;
+ unsigned long driver_release_tids = 0;
+ struct sk_buff_head frames;
+ bool more_data;
+
+ /* Service or PS-Poll period starts */
+ set_sta_flag(sta, WLAN_STA_SP);
+
+ __skb_queue_head_init(&frames);
+
+ ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
+ &frames, &driver_release_tids);
+
+ more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
+
+ if (reason == IEEE80211_FRAME_RELEASE_PSPOLL)
+ driver_release_tids =
+ BIT(find_highest_prio_tid(driver_release_tids));
if (skb_queue_empty(&frames) && !driver_release_tids) {
int tid;
@@ -1435,7 +1477,7 @@
/* This will evaluate to 1, 3, 5 or 7. */
tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
- ieee80211_send_null_response(sdata, sta, tid, reason, true);
+ ieee80211_send_null_response(sta, tid, reason, true, false);
} else if (!driver_release_tids) {
struct sk_buff_head pending;
struct sk_buff *skb;
@@ -1535,8 +1577,8 @@
if (need_null)
ieee80211_send_null_response(
- sdata, sta, find_highest_prio_tid(tids),
- reason, false);
+ sta, find_highest_prio_tid(tids),
+ reason, false, false);
sta_info_recalc_tim(sta);
} else {
@@ -1674,6 +1716,22 @@
}
EXPORT_SYMBOL(ieee80211_sta_eosp);
+void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ enum ieee80211_frame_release_type reason;
+ bool more_data;
+
+ trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
+
+ reason = IEEE80211_FRAME_RELEASE_UAPSD;
+ more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
+ reason, 0);
+
+ ieee80211_send_null_response(sta, tid, reason, false, more_data);
+}
+EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
+
void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
u8 tid, bool buffered)
{