mac80211: allow out-of-band EOSP notification

iwlwifi has a separate EOSP notification from
the device, and to make use of that properly
it needs to be passed to mac80211. To be able
to mix with tx_status_irqsafe and rx_irqsafe
it also needs to be an "_irqsafe" version in
the sense that it goes through the tasklet,
the actual flag clearing would be IRQ-safe
but doing it directly would cause reordering
issues.

This is needed in the case of a P2P GO going
into an absence period without transmitting
any frames that should be driver-released as
in this case there's no other way to inform
mac80211 that the service period ended. Note
that for drivers that don't use the _irqsafe
functions another version of this function
will be required.

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

5 files changed, 88 insertions, 2 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 778572d38bd3..3df32a04402c 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1971,7 +1971,8 @@ enum ieee80211_frame_release_type {
  *      at least one, however). In this case it is also responsible for
  *      setting the EOSP flag in the QoS header of the frames. Also, when the
  *      service period ends, the driver must set %IEEE80211_TX_STATUS_EOSP
- *      on the last frame in the SP.
+ *      on the last frame in the SP. Alternatively, it may call the function
+ *      ieee80211_sta_eosp_irqsafe() to inform mac80211 of the end of the SP.
  *      This callback must be atomic.
  * @allow_buffered_frames: Prepare device to allow the given number of frames
  *      to go out to the given station. The frames will be sent by mac80211
@@ -1981,7 +1982,8 @@ enum ieee80211_frame_release_type {
  *      frames from multiple TIDs are released and the driver might reorder
  *      them between the TIDs, it must set the %IEEE80211_TX_STATUS_EOSP flag
  *      on the last frame and clear it on all others and also handle the EOSP
- *      bit in the QoS header correctly.
+ *      bit in the QoS header correctly. Alternatively, it can also call the
+ *      ieee80211_sta_eosp_irqsafe() function.
  *      The @tids parameter is a bitmap and tells the driver which TIDs the
  *      frames will be on; it will at most have two bits set.
  *      This callback must be atomic.
@@ -3113,6 +3115,24 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
                                struct ieee80211_sta *pubsta, bool block);
 
 /**
+ * ieee80211_sta_eosp - notify mac80211 about end of SP
+ * @pubsta: the station
+ *
+ * When a device transmits frames in a way that it can't tell
+ * mac80211 in the TX status about the EOSP, it must clear the
+ * %IEEE80211_TX_STATUS_EOSP bit and call this function instead.
+ * This applies for PS-Poll as well as uAPSD.
+ *
+ * Note that there is no non-_irqsafe version right now as
+ * it wasn't needed, but just like _tx_status() and _rx()
+ * must not be mixed in irqsafe/non-irqsafe versions, this
+ * function must not be mixed with those either. Use the
+ * all irqsafe, or all non-irqsafe, don't mix! If you need
+ * the non-irqsafe version of this, you need to add it.
+ */
+void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta);
+
+/**
  * ieee80211_iter_keys - iterate keys programmed into the device
  * @hw: pointer obtained from ieee80211_alloc_hw()
  * @vif: virtual interface to iterate, may be %NULL for all
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index aef08969e353..2af4fca55337 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -1498,6 +1498,28 @@ TRACE_EVENT(api_enable_rssi_reports,
         )
 );
 
+TRACE_EVENT(api_eosp,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sta *sta),
+
+        TP_ARGS(local, sta),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                STA_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                STA_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT STA_PR_FMT,
+                LOCAL_PR_ARG, STA_PR_FMT
+        )
+);
+
 /*
  * Tracing for internal functions
  * (which may also be called in response to driver calls)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index da3206450192..9fa5f8a674bc 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -664,6 +664,11 @@ enum sdata_queue_type {
 enum {
         IEEE80211_RX_MSG        = 1,
         IEEE80211_TX_STATUS_MSG = 2,
+        IEEE80211_EOSP_MSG      = 3,
+};
+
+struct skb_eosp_msg_data {
+        u8 sta[ETH_ALEN], iface[ETH_ALEN];
 };
 
 enum queue_stop_reason {
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 336ceb9d2462..17b038aeac9b 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -325,6 +325,8 @@ u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 static void ieee80211_tasklet_handler(unsigned long data)
 {
         struct ieee80211_local *local = (struct ieee80211_local *) data;
+        struct sta_info *sta, *tmp;
+        struct skb_eosp_msg_data *eosp_data;
         struct sk_buff *skb;
 
         while ((skb = skb_dequeue(&local->skb_queue)) ||
@@ -340,6 +342,18 @@ static void ieee80211_tasklet_handler(unsigned long data)
                         skb->pkt_type = 0;
                         ieee80211_tx_status(local_to_hw(local), skb);
                         break;
+                case IEEE80211_EOSP_MSG:
+                        eosp_data = (void *)skb->cb;
+                        for_each_sta_info(local, eosp_data->sta, sta, tmp) {
+                                /* skip wrong virtual interface */
+                                if (memcmp(eosp_data->iface,
+                                           sta->sdata->vif.addr, ETH_ALEN))
+                                        continue;
+                                clear_sta_flag(sta, WLAN_STA_SP);
+                                break;
+                        }
+                        dev_kfree_skb(skb);
+                        break;
                 default:
                         WARN(1, "mac80211: Packet is of unknown type %d\n",
                              skb->pkt_type);
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 907b42081f3c..076593bffbcf 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1478,6 +1478,31 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_sta_block_awake);
 
+void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
+{
+        struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+        struct ieee80211_local *local = sta->local;
+        struct sk_buff *skb;
+        struct skb_eosp_msg_data *data;
+
+        trace_api_eosp(local, pubsta);
+
+        skb = alloc_skb(0, GFP_ATOMIC);
+        if (!skb) {
+                /* too bad ... but race is better than loss */
+                clear_sta_flag(sta, WLAN_STA_SP);
+                return;
+        }
+
+        data = (void *)skb->cb;
+        memcpy(data->sta, pubsta->addr, ETH_ALEN);
+        memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
+        skb->pkt_type = IEEE80211_EOSP_MSG;
+        skb_queue_tail(&local->skb_queue, skb);
+        tasklet_schedule(&local->tasklet);
+}
+EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
+
 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
                                 u8 tid, bool buffered)
 {