From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
---
include/net/mac80211.h | 24 ++++++++++++++++++++++--
net/mac80211/ieee80211_i.h | 5 +++++
net/mac80211/main.c | 14 ++++++++++++++
net/mac80211/sta_info.c | 23 +++++++++++++++++++++++
4 files changed, 64 insertions(+), 2 deletions(-)
--- a/net/mac80211/sta_info.c 2011-09-22 17:19:55.000000000 +0200
+++ b/net/mac80211/sta_info.c 2011-09-22 17:21:33.000000000 +0200
@@ -1466,6 +1466,29 @@ void ieee80211_sta_block_awake(struct ie
}
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;
+
+ 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)
{
--- a/include/net/mac80211.h 2011-09-22 17:16:55.000000000 +0200
+++ b/include/net/mac80211.h 2011-09-22 17:21:33.000000000 +0200
@@ -1967,7 +1967,8 @@ 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
@@ -1977,7 +1978,8 @@ 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.
@@ -3108,6 +3110,24 @@ void ieee80211_sta_block_awake(struct ie
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
--- a/net/mac80211/main.c 2011-09-22 17:12:54.000000000 +0200
+++ b/net/mac80211/main.c 2011-09-22 17:21:33.000000000 +0200
@@ -325,6 +325,8 @@ u32 ieee80211_reset_erp_info(struct ieee
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(un
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);
--- a/net/mac80211/ieee80211_i.h 2011-09-22 17:16:17.000000000 +0200
+++ b/net/mac80211/ieee80211_i.h 2011-09-22 17:21:33.000000000 +0200
@@ -662,6 +662,11 @@ 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 {
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
